CN112984906B

CN112984906B - refrigerator

Info

Publication number: CN112984906B
Application number: CN201911329086.1A
Authority: CN
Inventors: 王磊; 张秋菊; 许锦潮; 高伟康; 张树栋; 申乃雨
Original assignee: Hisense Refrigerator Co Ltd
Current assignee: Hisense Refrigerator Co Ltd
Priority date: 2019-12-12
Filing date: 2019-12-20
Publication date: 2025-06-24
Anticipated expiration: 2039-12-20
Also published as: CN211204586U; CN112984905A; CN112984908B; WO2021114960A1; CN211204582U; CN112984909B; CN112984904B; CN112984907A; CN211204583U; CN112984904A; CN211204579U; CN112984908A; CN112984909A; CN211204585U; CN112984906A; CN211204581U; CN211204584U; CN112984907B; CN211204580U; CN112984905B

Abstract

The present invention provides a refrigerator, which includes a box body that defines an insulated storage room, a low-pressure storage unit accommodated in the storage room, a drain pipe arranged on the box body, and a vacuum pump fixed in the storage room; one end of the vacuum pump is connected to the low-pressure storage unit, and the other end is connected to the drain pipe of the refrigerator; when the vacuum pump is in operation, the air in the low-pressure storage unit is extracted and transported to the drain pipe, and finally discharged from the refrigerator through the drain pipe; the arrangement of the present invention can avoid directly discharging the gas extracted from the low-pressure storage unit into the interior of the refrigerator, which will cause the food in other areas of the refrigerating room to taste each other, affecting the preservation effect of the food.

Description

Refrigerator with a refrigerator body

Technical Field

The invention belongs to the technical field of refrigerators, and particularly relates to a refrigerator.

Background

Refrigerators are an important share of the market as indispensable electrical products in home life. With the improvement of the quality requirements of consumers on fresh foods, the requirements on the refrigerator are also higher and higher, the refrigerator is required to have higher configuration and stronger functions, and especially, the stored fresh foods are expected to have longer storage period, so that the freshness of the foods is ensured, and the loss of nutrient components is prevented.

In order to better store food, it has been developed to provide a vacuum chamber in a refrigerator, and vacuum-pumping the vacuum chamber through a vacuum pumping device. The main function of vacuumizing is to deoxidize the vacuum chamber to prevent food from deteriorating. This is because the spoilage of foods is mainly caused by the activity of microorganisms, and the survival of most microorganisms requires oxygen. The vacuum chamber has no oxygen, so that the microorganism loses living environment, thereby achieving the function of food fresh-keeping. The preservation time of the food can be prolonged to 20-30 days by the vacuum technology, and compared with the traditional refrigerator refrigerating chamber, the preservation time of the food can be greatly improved. However, the current vacuumized and pumped gas is directly discharged into the refrigerator, so that the air flow in the refrigerator is caused to flow, and the food in other areas in the same space between the refrigerator and the vacuum chamber is easy to smell mutually.

In view of this, the present invention has been proposed.

Disclosure of Invention

The invention provides a refrigerator aiming at the technical problems.

In order to achieve the above purpose, the invention adopts the following technical scheme:

A refrigerator, comprising:

A housing defining an insulated storage compartment;

A low pressure storage unit which is accommodated in the storage room and can be evacuated to a pressure lower than the atmospheric pressure outside the case;

The drain pipe is arranged on the box body;

a vacuum pump fixed in the storage room and provided with an exhaust pipe communicated with the low-pressure storage unit and an exhaust pipe communicated with the drain pipe;

When the vacuum pump works, air in the low-pressure storage unit is sequentially conveyed to the drain pipe through the exhaust pipe, the vacuum pump and the drain pipe, and finally the box body is discharged through the drain pipe.

Preferably, an extraction opening connected with the extraction pipe is arranged at the position, close to the rear end, of the top of the low-pressure storage unit.

Preferably, the drain pipe is provided with an exhaust port communicated with the exhaust pipe, the exhaust pipe is communicated with the exhaust port through a first pipeline, and the exhaust pipe is communicated with the exhaust port through a second pipeline.

Preferably, the first pipeline is communicated with the exhaust pipe after being bent and turned for a plurality of times after being fixed with the exhaust hole on the low-pressure storage unit.

Preferably, the vacuum pump is provided on a rear wall of the storage compartment, and is close to a bottom of the low pressure storage unit.

Preferably, the first pipeline is fixed with the air extraction opening on the low-pressure storage unit and then extends along the top edge of the rear end of the low-pressure storage unit, then bends and turns to extend to a second turning position at the first turning position, turns to extend downwards to a third turning position at the second turning position, turns again at the third turning position and is communicated with the air extraction pipe, wherein the projection of the second turning position and the projection of the third turning position are both positioned on the extension line of the projection of the air extraction pipe on the plane where the bottom wall of the low-pressure storage unit is positioned.

Preferably, on the projection of the plane of the bottom wall of the low-pressure storage unit, the projection of the second steering bit coincides with the projection of the third steering bit.

Preferably, on the projection of the plane where the bottom wall of the low-pressure storage unit is located, the connection line between the projection of the first steering bit and the projection of the second steering bit is perpendicular to the projection of the rear wall of the low-pressure storage unit.

Preferably, on the projection of the plane where the bottom wall of the low-pressure storage unit is located, the projection of the first steering position is located on the projection of the low-pressure storage unit, and the projection of the second steering position is located between the projection of the rear wall of the storage compartment and the projection of the rear wall of the low-pressure storage unit.

Preferably, the exhaust pipe and the exhaust pipe of the vacuum pump are arranged up and down in parallel and are positioned at the same end of the vacuum pump.

Compared with the prior art, the invention has the advantages and positive effects that:

The invention provides a refrigerator, which comprises a refrigerator body defining a heat-insulating storage room, a low-pressure storage unit accommodated in the storage room, a drain pipe arranged on the refrigerator body and a vacuum pump fixed in the storage room, wherein one end of the vacuum pump is communicated with the low-pressure storage unit, the other end of the vacuum pump is communicated with the drain pipe of the refrigerator, when the vacuum pump operates, air of the low-pressure storage unit is pumped out and conveyed to the drain pipe, and finally the air is discharged out of the refrigerator through the drain pipe.

Drawings

Fig. 1 is a schematic view of the overall structure of a refrigerator according to the present invention;

fig. 2 is an exploded view of a low pressure storage unit of the refrigerator of the present invention;

fig. 3 is a perspective view of a housing of the refrigerator of the present invention;

fig. 4 is another angular perspective view of a housing of the refrigerator of the present invention;

fig. 5 is an exploded view of a door body of the refrigerator of the present invention;

FIG. 6 is a schematic view showing a structure of a low pressure storage unit when a door body and a housing of the refrigerator are in a closed position but are not locked;

FIG. 7 is a schematic partial cross-sectional view of the low pressure storage unit of the refrigerator of the present invention with the door and housing in a closed position but not locked;

FIG. 8 is a schematic partial cross-sectional view of another position of the low pressure storage unit of the refrigerator of the present invention with the door and housing in a closed position but not locked;

FIG. 9 is a schematic view showing a structure of a low pressure storage unit when a door body and a housing of the refrigerator of the present invention are locked;

FIG. 10 is a schematic partial cross-sectional view of a low pressure storage unit of the refrigerator of the present invention when a door body is locked with a housing;

FIG. 11 is a schematic view showing a structure of a low pressure storage unit when a door body and a housing of the refrigerator are unlocked and separated;

FIG. 12 is a schematic view showing the relative positions of the air extractor and the low pressure storage unit and the drain pipe of the refrigerator according to the present invention;

FIG. 13 is a view showing another angular relative position structure of the air extractor and the low pressure storage unit and the drain pipe of the refrigerator according to the present invention;

FIG. 14 is a schematic view showing the relative positions of a drain pipe and a liner of the refrigerator according to the present invention;

FIG. 15 is a schematic view showing the overall structure of an air extracting device of the refrigerator according to the present invention;

FIG. 16 is a schematic structural view of an elastic body of the refrigerator of the present invention;

FIG. 17 is an exploded view of an air extractor of the refrigerator of the present invention;

FIG. 18 is a sectional view of an air extracting device of the refrigerator of the present invention;

Fig. 19 is a perspective view of a housing of the refrigerator of the present invention;

FIG. 20 is an enlarged schematic view of area A of FIG. 19;

FIG. 21 is a schematic view showing the relative positions of the inner container and the casing of the refrigerator according to the present invention;

FIG. 22 is an enlarged schematic view of the area B in FIG. 21;

fig. 23 is a sectional view of a refrigerating chamber of the refrigerator of the present invention;

FIG. 24 is an enlarged schematic view of the area C in FIG. 23;

fig. 25 is a perspective view of a refrigerating chamber of the refrigerator of the present invention;

FIG. 26 is an enlarged schematic view of the area D in FIG. 25;

fig. 27 is an exploded perspective view of a pressure sensing unit of a low pressure storage unit of the refrigerator of the present invention;

FIG. 28 is an enlarged schematic view of the area E in FIG. 27;

fig. 29 is a partial sectional view showing a low pressure storage unit of the refrigerator of the present invention.

In the above figures, a refrigerator 1; a case 2; a housing 2a; the inner container 2b, the pit 30, the refrigerating chamber 12, the low-pressure storage chamber 14, the taking-out opening 14a, the sealing element 16, the guide rail unit 17, the air charging channel 18, the pressure relief piece 19, the rod 20, the rotary plate 59, the fresh container 44, the relief hole 39, the low-pressure storage unit 15, the shell 4, the reinforcing rib 40, the upper 41, the top wall 41a, the rear wall 41b, the first upper side wall 41c, the second upper side wall 41d, the lower shell 42, the bottom wall 42a, the lower rear wall 42b, the first lower side wall 42c, the second lower side wall 42d, the front end wall 42e, the butt surface 43, the door body 5, the front surface 5a, the lower end surface 5b, the side end face 5c, the accommodating cavity 52, the convex column 53, the container 54, the first fitting part 6, the first enclosing plate 60a, the second enclosing plate 60b, the lock accommodating part 61, the locking part 62, the locking wall 62a, the guide wall 62b, the travel 63a, the through opening 64, the opening 65, the second fitting part 7, the first strip 71a, the bottom wall 42a, the bottom wall 42b, the lower wall 71b, the lower wall 42b, the lower end wall 71b, the first lower wall 42b, the second strip 71, the upper strip 71, the door 7, the door panel 71, the door frame 7, the first seat surface 7, door frame seat frame door frame 7, door frame seat 7, door seat frame seat panel 7, door seat frame seat frame seat panel 91, a first through hole 91a, a second through hole 91b, a rubber seal 92, a support column 92a, a pressure switch 93, a spring 94, a slider 95, a floating plate 95, a floating column 95b, a recess 95c, a mounting block 45, a mounting table 46, a fixing table 47, a pressure cap 55, a groove 56, a fixing plate 57, a receiving chamber 58, a third through hole 58a, and an elastic hook 58b.

Detailed Description

The present application will be further described with reference to specific examples so that those skilled in the art may better understand the present application and practice it, but the scope of the present application is not limited to the scope described in the specific embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be arbitrarily combined with each other.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present invention) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are correspondingly changed accordingly.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Referring to fig. 1-11, a refrigerator 1 includes a heat-insulating case 2, and the case 2 includes a housing 2a, a liner 2b, and a thermal insulation layer (not shown) therebetween. The case 2 defines a plurality of heat-insulated storage compartments to store articles such as food. In the present embodiment, these storage compartments are a refrigerating compartment 12 located at the upper portion and a freezing compartment located at the bottom portion, respectively. The storage compartments may be closed by respective door. In the present invention, the refrigerating chamber 12 is provided with a refrigerating split door, and the freezing chamber is provided with a freezing split door.

It should be understood that the present invention should not be limited to a specific distribution form of the storage compartments of the refrigerator 1, and that the present invention may be applied to other forms of the refrigerator 1, such as the refrigerator 1 having a drawer type door, etc.

The refrigerator 1 has an evaporative refrigeration system forming a closed loop. The refrigeration system includes at least a compressor (not shown), a condenser (not shown), a throttle device (not shown), and an evaporator (not shown). Since such a refrigeration system is a well-known technology in the art, a further description thereof will be omitted. Of course, other forms of refrigeration systems (e.g., absorption refrigeration systems, thermoelectric refrigeration systems) may also be used with the refrigerator 1.

The refrigerator 1 is provided with a low pressure storage unit 15 which can be maintained in a low pressure state, and an air extracting device for extracting air from the low pressure storage unit 15. The evacuation device may comprise a vacuum pump 22 and a line connected between the vacuum pump 22 and the low pressure reservoir unit 15.

The refrigerator 1 is provided with a control unit for controlling the air extractor to vacuumize the low-pressure storage unit 15, so as to realize automatic control of vacuuming the low-pressure storage unit 15.

In the present embodiment, the low pressure storage unit 15 is provided in the refrigerating chamber 12. It should be appreciated that in other embodiments, the low pressure storage unit 15 may be disposed within other storage compartments, such as a variable temperature compartment whose temperature range is switchable between a cold storage temperature zone and a freezer temperature zone.

The low pressure storage unit 15 is located at the bottom of the refrigerating chamber 12 and is supported on the bottom wall of the refrigerating chamber 12. The low-pressure storage unit 15 may be provided with a fresh-keeping container 44 having a high humidity and suitable for preserving foods such as vegetables, and the low-pressure storage unit 15 and the fresh-keeping container 44 are disposed in parallel at the bottom of the refrigerating chamber 12.

The low pressure storage unit 15 may be constructed separately from the case 2 and then assembled in the case 2. Referring to fig. 2-4, in the present embodiment, the low pressure storage unit 15 has a substantially flat cuboid shape, and the sum of the width of the low pressure storage unit 15 and the width of the fresh food container 44 is slightly smaller than the width of the refrigerating chamber 12, so as to effectively allocate the bottom space of the refrigerating chamber 12, so that the fresh food container 44 and the low pressure storage unit 15 can be inserted into the refrigerating chamber 12 or pulled out from the refrigerating chamber 12.

The low pressure storage unit 15 includes a housing 4 fixed in the refrigerating chamber 12, and a door 5 connected to the housing 4 and being pushed into or withdrawn from the refrigerating chamber 12.

Referring to fig. 2-4, the housing 4 has a box-like structure defining a flat low pressure storage chamber 14 having a food access opening 14 a. In this embodiment, the access opening 14a is located at the front end of the housing 4 facing the user.

The outer side of the wall of the shell 4 is provided with grid-shaped reinforcing ribs 40 to increase the wall strength of the shell 4 and avoid deformation of the shell 4 caused by internal and external air pressure difference after vacuumizing.

The casing 4 includes an upper casing 41 and a lower casing 42 which are connected to form the low-pressure storage chamber 14, wherein the upper casing 41 and the lower casing 42 are integrally formed by ultrasonic welding, and specifically, the lower casing 42 includes a bottom wall 42a, a first lower side wall 42c, a lower rear wall 42b, a second lower side wall 42d which are sequentially connected to each other at the edge of the bottom wall 42a, and a front end wall 42e which is located at the front end portion of the lower casing 42 and is formed with a pick-and-place port 14a, wherein the bottom wall 42a of the lower casing is the bottom wall of the low-pressure storage unit 15. In this embodiment, the front end wall 42e may have a flat abutment surface 43 substantially perpendicular to the horizontal plane for abutment with the door body 5.

The upper shell 41 comprises a top wall 41a, an upper rear wall 41b, a first upper side wall 41c and a second upper side wall 41d which are sequentially connected with the edge of the top wall 41a, wherein the distance between the lower wall surfaces of the first upper side wall 41c and the second upper side wall 41d of the upper shell 41 and the top wall 41a is linearly reduced from back to front, and the distance is reduced to 0 at the front end edge of the top wall 41 a. I.e. the projection of the first upper sidewall 41c and the second upper sidewall 41d on a plane perpendicular to the top surface is triangular.

The upper rear wall 41b is matched with the lower rear wall 42b, the first lower side wall 42c is matched with the first upper side wall 41c, the second lower side wall 42d is matched with the second upper side wall 41d, the front end portion of the top wall 41a is matched with the front end wall 42e of the lower shell 42, and the abutting positions are welded and fixed through ultrasonic welding, so that the upper shell 41 and the lower shell 42 are fixedly connected to form the low-pressure storage chamber 14. The above ultrasonic welding effectively improves the connection strength of the upper case 41 and the lower case 42, and ensures the air tightness of the entire case 4. In addition, the taking and placing opening 14a of the housing 4 is formed on the front end wall 42e of the lower housing 42, so that the taking and placing opening 14a of the housing 4 has integration, and the air tightness of the housing 4 is effectively ensured. Furthermore, the distance between the lower wall surfaces of the first upper side wall 41c and the second upper side wall 41d and the top wall 41a is linearly reduced from back to front, and the distance between the lower wall surface and the top wall 41a is reduced to 0 at the front edge of the top wall 41a, so that the number of the mating surfaces of the upper shell 41 and the lower shell 42 is reduced, and the overall air tightness of the shell 4, especially the air tightness of the shell 4 at the access opening 14a, is improved. On the other hand, the case 4 is provided as a separate structure of the upper case 41 and the lower case 42, so that the grid-shaped reinforcing ribs 40 can be easily processed.

The door body 5 may be provided with an annular sealing element 16 to bring the housing 4 into airtight engagement with the door body 5 when the door body 5 is in the closed position, preventing gas from entering the low pressure storage chamber 14 from the junction between the housing 4 and the door body 5. The sealing element 16 may also be provided at the front end of the housing 4, for example connected to the front end wall 42 e.

When the low-pressure storage chamber 14 is closed by the door 5 and the air extracting device is started, the air in the low-pressure storage chamber 14 is extracted, and the low-pressure storage chamber 14 is in a low-pressure state. According to a preferred embodiment of the present invention, at the end of the evacuation process, the pressure within the low pressure reservoir 14 is between a standard atmospheric pressure and absolute vacuum. Since the air pressure in the low pressure reservoir chamber 14 is below normal atmospheric pressure, those skilled in the art are also commonly referred to as "vacuum chambers".

The door body 5 is a drawer type door, and the door body 5 may be pushed toward the housing 4 to close the access opening 14a of the low pressure storage chamber 14 or pulled out to open the low pressure storage chamber 14. The rear side of the door body 5 is connected with a tray-shaped storage container 54 for storing articles. The user obtains the article located in the low pressure storage unit 15 or stores the article in the low pressure storage unit 15 by pushing the storage container 54 into or out of the low pressure storage chamber 14. Together, the door 5 and the storage container 54 form a drawer unit that can be pushed into and pulled out of the housing 4.

A telescopic rail unit 17 can be arranged between the storage container 54 and the housing 4, so that the door 5 and the storage container 54 can be pulled out of the housing 4 or pushed into the housing 4 smoothly.

The low pressure storage unit 15 includes a pair of locking mechanisms for locking the door body 5 and the housing 4 in the closed position. As shown in fig. 2 to 11, each locking mechanism includes a first engaging portion 6 provided on the housing 4 and a second engaging portion 7 rotatably provided around the rotation axis X at both ends of the door body 5 for engaging with the first engaging portion 6 of the corresponding side to effect locking and unlocking of the door body 5. By the combination of the second fitting portion 7 and the first fitting portion 6, the door body 5 is locked in the closed position, and the sealing member 16 between the housing 4 and the door body 5 is sufficiently deformed by the pressing of the locking force by the locking mechanism, so that the air tightness between the door body 5 and the housing 4 is improved.

The first lower side wall 42c and the second lower side wall 42d of the casing 4 near the picking and placing port 14a are respectively provided with a lock catch accommodating part 61 and a first matching part 6 positioned in the lock catch accommodating part 61, and the casing 4 is provided with a first enclosing plate 60a parallel to the bottom wall 42a of the casing 4 and a second enclosing plate 60b connected with the rear end part of the first enclosing plate 60a far away from the picking and placing port 14a and extending forwards and downwards to the foremost end of the casing 4. The first shroud 60a and the second shroud 60b are connected to form a lock accommodating portion 61. The latch accommodating portion 61 is formed with a passage opening 64 at the forefront end of the housing 4, the passage opening 64 being for inserting or extracting the second engaging portion 7. In this embodiment, the end surfaces of the first and second coamings 60a and 60b away from the wall of the housing 4 are co-end surfaces with the end surfaces of the ribs 40 away from the wall of the housing 4. The end face of the first fitting portion 6 far from the wall of the housing 4 and the end face of the reinforcing rib 40 far from the wall of the housing 4 are co-located, and the above arrangement can ensure that the occupied space of the low-pressure storage unit 15 is not increased, so that the space can be fully utilized.

The first engaging portion 6 includes a locking portion 62, the locking portion 62 is fixed to the first peripheral plate 60a in the lock receiving portion 61, the locking portion 62 includes a locking wall 62a perpendicular to the first peripheral plate 60a and a guide wall 62b provided obliquely, and one end of the guide wall 62b is connected to an end of the locking wall 62a remote from the first peripheral plate 60a and the other end is connected to an end of the first peripheral plate 60a near the access opening 14 a.

The upper part of the lock catch accommodating part 61 on at least one side of the shell 4 is provided with a position detecting device which is electrically connected with the air extracting device and is used for detecting the locking and unlocking states of the door body 5 in a matched mode with the second matching part 7. The position detecting device comprises a travel switch 63 fixedly arranged on the shell and a travel push rod 63a slidably connected to the shell, wherein the travel switch 63 is provided with a trigger part, one end of the travel push rod 63a is matched with the trigger part, the other end of the travel push rod is matched with the second matching part 7, and when the second matching part 7 slides along the locking wall 62a, the travel push rod 63a is pushed to move so as to trigger the travel switch 63. The first shroud 60a is provided with openings 65 separated from the guide wall 62b on both sides of the lock wall 62a, and the openings 65 are provided adjacent to the lock wall 62 a. The stroke push rod 63a of the stroke switch 63 extends into the lock catch accommodating portion 61 through the opening 65 and is located adjacent to the lock wall 62 a.

As shown in fig. 2 and 5-11, the door body 5 is connected with a decorative cover 8. The door body 5 is provided at opposite ends thereof with a connecting piece 83, and the second fitting portion 7 is rotatably provided on the connecting piece 83. The second engaging portion 7 rotates about its rotation axis X and rotates the handle 81 fixed thereto.

Two ends of the handle 81 are respectively fixed with a second fitting portion 7. In the present embodiment, after the second engaging portion 7 is fixed to the corresponding end of the handle 81, it is fixed to the handle 81 immovably with respect to the handle 81 by a fixing means such as a screw, so that when the handle 81 is rotationally moved, the second engaging portion 7 is also rotated about the rotation axis X.

In this embodiment, the second mating portion 7 includes a locking plate rotatable about a rotation axis X, the axis of the rotation axis X being disposed horizontally and having a set distance from the handle 81, a protrusion 72 being disposed on a side of the locking plate facing the side wall of the housing 4, and the protrusion 72 sliding along the guide wall 62b to the rear side of the locking wall 62a to lock the door 5 and the housing 4 when the locking plate is driven by the handle 81 to rotate about the rotation axis X.

The locking plate is in a flat plate shape and comprises a first slat 71a, a second slat 71b and a third slat 71c which are connected end to end in sequence, and the connection part of the first slat 71a and the second slat 71b extends to form a fourth slat 71d which is positioned on the same side of the third slat 71c as the first slat 71a and forms an acute angle with the first slat 71 a.

The middle position of the second slat 71b is rotatably fixed on the connecting piece 83 at the end of the door body 5, and the protruding block 72 is arranged at the connection position of the second slat 71b and the third slat 71 c. The end of the fourth slat 71d remote from the third slat 71c is secured to the respective extremity of the handle 81. When the handle 81 is rotated, the handle 81 drives the second engaging portion 7 to rotate integrally about its rotation axis X located at the intermediate position of the second slat 71b via the fourth slat 71 d.

The front side of the door body 5 may be provided with an air charging passage 18 (as shown in fig. 5) for closing or opening the air charging passage 18 provided on the door body 5 for communicating the inner and outer sides of the low pressure storage unit 15, and a pressure relief device for closing or opening the air charging passage 18. The pressure relief device comprises a rod body 20 linked with the second matching part 7, a rotary plate 59 fixedly connected to the rod body 20 and a pressure relief piece 19 fixed on the rotary plate 59 and used for closing or opening the inflation channel 18. The two ends of the rod body 20 are respectively fixed on the locking plates at the corresponding sides, the rod body 20 and the protruding blocks 72 are respectively positioned at the two sides of the rotating shaft X, the rotating axis of the rotating plate 59 is overlapped with the rotating shaft X of the second matching part, the second matching part 7 drives the rod body 20 and the rotating plate 59 to coaxially rotate when being driven by the handle 81 to rotate around the rotating shaft X, and the pressure release piece 19 closes the inflation channel 18. Wherein, both ends of the rod 20 penetrate through the decorative cover 8, and the first strip 71a of the second mating portion 7 is fixed to the corresponding end of the rod 20 in a non-movable manner. The two sides of the decorative cover 8 are provided with avoiding holes 39 which are consistent with the rotating motion track of the rod body 20, and a gap for the rotating motion of the rod body 20 is reserved between the door body 5 and the decorative cover 8.

Referring to fig. 5 in conjunction with fig. 2, the door body 5 has a receiving cavity 52 recessed rearward from a front surface 5a thereof for receiving at least a portion of the pressure relief device. The inflation channel 18 is arranged on the cavity wall of the accommodating cavity 52 far away from the decorative cover 8 and is communicated with the low-pressure storage chamber 14 and the accommodating cavity 52, a convex column 53 taking the rotation axis X as a central axis is arranged in the accommodating cavity 52, one end of a rotation plate 59 is fixed with the rod body 20, the other end of the rotation plate 59 is rotatably fixed in the accommodating cavity 52 around the convex column 53, the pressure release piece 19 is arranged on the inner side of the rotation plate 59, and a torsion spring separated from the pressure release piece 19 on two opposite sides of the rotation plate 59 is arranged between the rotation plate 59 and the cavity wall of the accommodating cavity 52 far away from the decorative cover 8. When the door body 5 is locked with the shell 4, the first matching part 6 is locked with the second matching part 7, and the torsion spring compresses the rotary plate 59, so that the pressure release piece 19 compresses the inflation channel 18. When the door body 5 is at the closed position but not yet locked, after the applied external force is released, the rotary plate 59 is pressed inwards and downwards under the action of the torsion spring, the rotary plate 59 drives the second matching part 7 and the handle 81 to rotate inwards and downwards, so that when the door body is closed by a user, the user can be reduced, the closing operation is simplified, in addition, the torsion spring can limit the limit position of the handle 81 for rotating upwards and forwards, and the handle 81 can be prevented from being pressed by the handle 81 and the door body 5 when the upper end of the handle 81 is close to the front surface 5a of the door body 5 due to the fact that the handle 81 continues rotating.

According to a preferred embodiment of the present invention, the end of the rotary plate 59 is provided with a fixing channel for mounting the rod 20 and having a polygonal cross section, the rod 20 having a cross section corresponding to the cross section of the fixing channel, the polygonal cross section being arranged such that the rod 20 and the rotary plate 59 cannot perform a relative rotary motion.

As shown in fig. 6 to 8, the door body 5 is in a state when it is in a closed position but not yet locked, and the handle 81 is in the first position. When the user presses the handle 81 downward and backward, the handle 81 rotates inward around the rotation axis X of the second fitting portion 7, and simultaneously the handle 81 drives the second fitting portion 7 and the rod body 20 to rotate inward, the projection 72 of the second fitting portion 7 gradually approaches the side of the locking portion 62 away from the pick-and-place port 14a, and gradually approaches the stroke push rod 63a of the stroke switch 63, and the rod body 20 drives the rotation plate 59 to rotate inward, and the rotation plate 59 drives the pressure release member 19 gradually approaches the inflation channel 18.

As shown in fig. 9-10, the door 5 and the housing 4 are in a locked condition with the handle 81 in the second position. When the handle 81 rotates to the second position, the second matching part 7 rotates to enter the lock catch accommodating part 61, the protruding block 72 on the second matching part 7 moves to an adjacent position behind the locking wall 62a and pushes the travel push rod 63a to move upwards to trigger the travel switch 63, the travel switch 63 sends a control signal for closing the door to the control unit, the control unit controls the air extractor to start air extraction according to the control signal, and at the moment, the pressure release piece 19 is tightly contacted with the air charging channel 18 to block the air charging channel 18, and the low-pressure storage chamber 14 forms a closed space. The first matching part 6, the second matching part 7 and the travel switch 63 electrically connected with the air extractor can timely monitor the locking state of the door body 5 and the shell 4, so that when the door body 5 and the shell 4 are locked, a vacuumizing signal is timely sent to the air extractor, the vacuum degree of the low-pressure storage unit 15 is ensured, and the fresh-keeping effect of food is ensured.

As a way of closing the door, the user can lift the handle 81 upward and push the door to the housing 4, and when the door 5 is in the closed position but not yet locked, the handle 81 is pressed downward and backward to complete locking, and the pressure release member 19 is in close contact with the inflation channel 18 to block the inflation channel 18, as shown in fig. 11, when the door 5 and the housing 4 are in the unlocked and separated open state. As another door closing mode, a user can directly push the decorative cover 8, the second matching part 7 moves in parallel to the lock catch accommodating part 61 under the driving of the decorative cover 8, the protruding block 72 on the second matching part 7 contacts with the guide wall 62b of the locking part 62, the protruding block 72 moves downwards along the guide wall 62b under the action of horizontal pushing force and the guide wall 62b and drives the second matching part 7 to rotate downwards around the rotating shaft X, the protruding block 72 moves downwards to gradually approach the connection position of the guide wall 62b and the locking wall 62a, the door body 5 is pushed to move towards the shell 4 continuously, the protruding block 72 moves to the adjacent position at the rear side of the locking wall 62a, the door body 5 is locked with the shell 4, and meanwhile the pressure release piece 19 is tightly contacted with the inflation channel 18 to seal the inflation channel 18. In the invention, the door closing mode of directly pushing the decorative cover 8 on the front side of the door body 5 to push and close is convenient and quick without using the handle 81, so that the effort input of a user for placing the application point on the door handle 81 is reduced, and the locking process is smooth and stable under the action of the guide wall 62b, and the collision is avoided.

When the door body 5 and the housing 4 are in the locked state and the door body 5 is to be opened, a user can hold the lower end of the handle 81 to lift up and out, the handle 81 rotates about the rotation axis X, and the second fitting portion 7 fixed to the connection member 83 rotates up. In this process, the rod body 20 rotates upward and drives the rotation plate 59 to rotate upward around the rotation axis X, the pressure release member 19 also releases the closure of the inflation passage 18, and the external air enters the low pressure storage chamber 14 through the inflation passage 18 to balance the internal and external pressures. After that, the user can grasp the handle 81 and pull forward, i.e., open the door 5.

The above second fitting part 7 and the first fitting part 6 accomplish locking without increasing the space occupied by the low pressure storage unit 15, and have compact structure and stable fitting.

The combination of the second mating portion 7 and the first mating portion 6 in the locking position provides a locking force between the door body 5 and the housing 4, so that the sealing member 16 is sufficiently deformed, thereby improving the air tightness between the door body 5 and the housing 4.

When the handle 81 is in the position shown in fig. 9 and 10, the air charging passage 18 is tightly closed by the pressure release member 19, and when the handle 81 is in the position shown in fig. 6 to 8, the air charging passage 18 has been opened, and the outside air can enter the low pressure storage chamber 14 through the air charging passage 18 to release the low pressure state of the low pressure storage chamber 14. It should be appreciated that in other embodiments, the inflation channel 18 and pressure relief member 19 may be provided separately from the handle 81. For example, a button is provided on the door body 5, by pressing the button, the inflation channel 18 is opened, and then the user operates the handle 81 again to open the door body 5.

The region of the door body 5 near the lower end face 5b thereof is recessed rearward from the front face 5a thereof to form an accommodation space 82 accommodating the handle 81, and in this embodiment, the lower end of the accommodation space 82 extends to the lower end face 5b of the door body 5, and the left and right ends extend to the side end faces 5c of the door body 5. When the door body 5 is in a locked state, the handle 81 is positioned in the accommodating space 82, and the front surface of the handle 81 is flush with the front surface 5a of the door body 5 positioned at the upper portion of the accommodating space 82, so as to reduce the occupied volume of the low-pressure storage unit 15. It is particularly preferable that the handle 81 in the second position is completely accommodated in the accommodation space 82 of the door body 5 not to protrude beyond the front surface of the door body 5. The door body 5 is in a state of being in a closed position but not yet locked, at this time, the handle 81 is in a first position, the handle 81 is moved out of the accommodating space 82 and is located at the front side of the front surface 5a of the door body 5, and the handle 81 is in the first position when the user opens the low pressure storage unit 15, at this time, the door of the refrigerator 1 is opened, and the setting of the internal space of the refrigerator 1 occupied by the low pressure storage unit 15 is not affected.

When the door of the refrigerator 1 is in a closed state and the door body 5 of the low pressure storage unit 15 is in a closed position but the handle 81 is in a second position (retracted position), the inside of the door is kept at a distance from the handle 81 so as not to damage the low pressure storage unit 15 when the door is closed. Accordingly, by disposing the handle 81 in the accommodation space 82, the distance between the low pressure storage unit 15 and the inside of the door of the refrigerator 1 can be reduced, and thus the space utilization of the refrigerator 1 can be increased.

A decorative cover 8 is attached to the door body 5 to shield the pressure relief device from the front face of the door body 5. Thus, the rod 20 is integrally located within the door body 5.

After being fixed to the door body 5, the handle 81 is rotatably connected to the door body 5. When the handle 81 is rotated, the second engaging portion 7 is rotated, and the lever body 20 and the rotation plate 59 are rotated around the rotation axis X.

The handle 81 is rotatable about the rotation axis X between a first position and a second position. In the first position, the handle 81 forms the largest angle with the wall surface of the housing space 82 of the door 5 near the housing 4, and the lower end forms the largest distance with the wall surface of the housing space 82 of the door 5 near the housing 4, so the first position may also be referred to as an extended position. In the second position, the angle formed between the handle 81 and the wall surface of the housing space 82 on the door 5 near the housing 4 is smallest, and the distance between the lower end thereof and the wall surface of the housing space 82 near the housing 4 is smallest, so the second position may also be referred to as a retracted position. Accordingly, the second engaging portion 7 that is in linkage with the handle 81 and the lever body 20 that is in linkage with the second engaging portion 7 are also restricted to rotate between the first limit position and the second limit position, wherein when the handle 81 is in the first position, both the second engaging portion 7 and the lever body 20 are in the first limit position (as shown in fig. 6 and 8), and when the handle 81 is in the second position, both the second engaging portion 7 and the lever body 20 are in the second limit position (as shown in fig. 9).

Fig. 12 to 14 are schematic structural views of an exhaust arrangement of a low pressure storage unit of a refrigerator, and the refrigerator 1 has a drain pipe 21 for draining condensed water inside the refrigerator 1 as shown in fig. 12 to 14. One end of the air extracting device is communicated with the low-pressure storage unit 15, and the other end is communicated with the drain pipe 21 of the refrigerator 1. The air extracting device operates to extract and convey air in the low pressure storage unit 15 to the drain pipe 21, and finally, the air is discharged from the refrigerator 1 through the drain pipe 21. So as to avoid that the air pumped out from the low-pressure storage unit 15 is directly discharged into the refrigerator 1 to cause the foods in other areas in the refrigerating chamber 12 to be mutually tainted, thereby influencing the fresh-keeping effect of the foods.

The air extractor comprises a vacuum pump 22, a first pipe 23 connecting the vacuum pump 22 with the low pressure storage unit 15, and a second pipe 24 connecting the vacuum pump 22 with the drain pipe 21. The vacuum pump 22 is provided on the inner container 2b of the refrigerating chamber 12 near the bottom of the low pressure storage unit 15.

The top of the low-pressure storage unit 15 is provided with an extraction opening connected with a first pipeline 23 near the rear end, and the drain pipe 21 is provided with an exhaust opening connected with a second pipeline 24;

The vacuum pump 22 has a pump body, an exhaust pipe 22a communicating with the first pipe 23, and an exhaust pipe 22b communicating with the second pipe 24. The air exhaust pipe 22a of the vacuum pump 22 is arranged in parallel with the air exhaust pipe 22B and is positioned at the same end of the vacuum pump 22, the first pipeline 23 is fixed with the air exhaust hole on the low-pressure storage unit 15, bends and turns to extend along the top edge of the rear end of the low-pressure storage unit 15, is bent at the first turning position A ₁ to turn to the rear wall of the liner 2B, and extends to the second turning position B ₁ in parallel with the top wall 41a of the low-pressure storage unit 15, is turned at the second turning position B ₁ again to extend downwards at 90 degrees to the third turning position C ₁, is turned at the third turning position C ₁ again to be communicated with the air exhaust pipe 22a, wherein the projections of the second turning position B ₁ and the third turning position C ₁ are positioned on the extension line projected by the air exhaust pipe 22a, and in addition, the projection of the first turning position A ₁ falls on the projection of the low-pressure storage unit 15, and the projection of the second turning position B ₁ is positioned between the projection of the rear wall of the liner 2B and the projection of the rear wall of the low-pressure storage unit 15. Wherein the projection of the second steering bit B ₁ coincides with the projection of the third steering bit C ₁. The second pipe 24 communicates with the exhaust pipe 22b of the vacuum pump 22, and passes through the inner container 2b to communicate with the exhaust port on the drain pipe 21. The above multiple-turn arrangement of the first pipe 23 makes the path of the pipe neat and reduces the space occupied by the pipe in the direction perpendicular to the rear wall of the liner 2b to increase the available space of the low pressure storage unit 15.

It should be understood that the present invention should not be limited to the above-described turning form of the first suction pipe 22a, and that the present invention may be applied to other turning forms to reduce the space occupied by the pipe.

Fig. 15-18 are schematic structural views of an air extractor of a refrigerator, and as shown in fig. 15-18, the air extractor comprises a pump shell 27 and an elastic body 28 sleeved between the pump shell 27 and the pump shell 27. The pump shell 27 is provided with a connecting plate 27a fixed with the rear wall of the liner 2b, in this embodiment, the connecting plate 27a is provided with a screw hole, and the pump shell 27 is fixedly connected with the rear wall of the liner 2b through a screw.

The elastic body 28 is provided with a main body part 74 for installing the vacuum pump 22, the main body part 74 is provided with an installation cavity 74a consistent with the shape of the vacuum pump 22, and the radial dimension of the installation cavity 74a of the main body part 74 is smaller than the radial dimension of the corresponding position of the vacuum pump 22, so that the elastic body 28 is closely attached to the vacuum pump 22, and vibration on the vacuum pump 22 is timely absorbed.

The vacuum pump 22 is provided with a positioning block 22c at one end opposite to the exhaust pipe 22a and the exhaust pipe 22b, a through hole 75 for the exhaust pipe 22a and the exhaust pipe 22b to pass through is arranged at one end of the installation cavity 74a of the main body 74, an end cover 76 matched with the end part of the vacuum pump 22 is arranged at the other end, and a positioning hole 76a matched with the positioning block 22c is arranged on the end cover 76 so as to protect the end part of the vacuum pump 22.

The outer periphery of the main body 74 is provided with a plurality of projections 77 arranged in parallel along the central axis of the main body 74 and surrounding the main body 74. The outer diameter of the main body 74 of the elastic body 28 is smaller than the inner diameter of the pump casing 27, and the outer diameter of the elastic body 28 is larger than the inner diameter of the pump casing 27, so that when the elastic body 28 is mounted in the pump casing 27, the elastic body 28 is mounted between the pump casing 27 and the vacuum pump 22 in a pressed manner, and an air cavity is formed between the plurality of protrusions 77, so that vibration and noise reduction effects of the elastic body 28 are improved.

The bulges 77 are provided with notches 77a, the positions of the notches 77a on the bulges 77 are corresponding, the notches 77a reserve space for deformation of the elastic body 28, the deformation capacity of the elastic body 28 is ensured, and the vibration reduction and noise reduction effects are improved. In this embodiment, the notch 77a is semicircular. The plurality of notches 77a are uniformly distributed on the protrusion 77. It should be understood that the present invention should not be limited to the shape and number of notches 77a described above, and that the present invention can be applied to notches 77a of other shapes, such as 4 arcuate notches 77a provided in one protrusion 77.

The pump case 27 includes a first case 27b and a second case 27c, and the first case 27b is engaged with the second case 27c to be mounted outside the elastic body 28. The pump shell 27 is arranged in a split mode, so that the disassembly and assembly are convenient.

Fig. 19 to 22 are schematic structural views of a fixing mechanism of a low pressure storage unit of a refrigerator, and as shown in fig. 19 to 22, the refrigerator 1 includes a plurality of fixing mechanisms for connecting the low pressure storage unit 15 and the liner 2 b. Each of the fixing mechanisms includes a first fixing portion 3 provided on a bottom wall 42a of the low pressure storage unit 15 and a second fixing portion 11 provided on a bottom wall of the liner 2b of the refrigerating chamber 12, and the low pressure storage unit 15 is fixed to the refrigerating chamber 12 by the combination of the first fixing portion 3 and the second fixing portion 11.

The first fixing portion 3 has a first side plate 31, a second side plate 32 and a third side plate 33 sequentially connected, wherein the first side plate 31 and the third side plate 33 are perpendicular to the second side plate 32 and are located on the same side of the second side plate 32, so as to form a guiding channel 36 between the first side plate 31 and the third side plate 33, and form a guiding channel opening 36a at one end far from the second side plate 32. The second side plate 32 is provided with a fixing hole 32a. The end of the second side plate 32 far away from the bottom wall 42a of the housing 4 is provided with a first bottom plate 34, the first bottom plate 34 connects the second side plate 32 and the third side plate 33, a limiting channel 35 is formed on the first bottom plate 34, the limiting channel 35 extends in a direction far away from the second side plate 32, and a limiting channel port 35a is formed at the end of the first bottom plate 34 far away from the second side plate 32, namely, a guiding channel port 36a is consistent with the direction of the limiting channel port 35 a. The limiting channel 35 may be formed as a diverging shape along the direction from the second side plate 32 to the limiting channel opening 35 a. The plurality of first fixing portions 3 are distributed uniformly on the bottom wall 42a of the low-pressure storage unit 15 in the orientation of the guide passage opening 36a. In this embodiment, four first fixing portions 3 are disposed in two groups and two rows. The guide passage opening 36a of the guide passage 36 is directed to the rear side of the housing 4 or is located at a side facing away from the fresh container 44, so that a gap between the low pressure storage unit 15 and the liner 2b after installation is reduced as much as possible, thereby fully utilizing the internal space of the refrigerator 1, avoiding reserving an installation space for installing the low pressure storage unit 15, and reducing the occupied space of the low pressure storage unit 15.

The second fixing portion 11 includes a second bottom plate 11a fixed to the bottom wall of the liner 2b, a fixing hook 11b fitted in the fixing hole 32a, and a fixing post 11c connecting the second bottom plate 11a and the fixing hook 11 b. The fixing post 11c is installed in the guide channel 36 and the limiting channel 35, the fixing hook 11b is located between the first bottom plate 34 and the bottom wall 42a of the shell 4 and is installed in the fixing hole 32a to be clamped with the second side plate 32, at the moment, the fixing post 11c is abutted against the end part, close to the second side plate 32, of the limiting channel 35, and the three dimensions of the second fixing portion 11 are limited through the matching arrangement, so that the installation stability is improved. The second fixing portions 11 are uniformly distributed on the bottom wall of the liner 2b in the same orientation. In this embodiment, the bottom wall of the liner 2b is provided with a recess 30 for fixing the second bottom plate 11a, so as to fix the second fixing portion 11 and reduce the height of the space occupied by the second fixing portion 11.

During assembly, the position of the low-pressure storage unit 15 is adjusted to enable the fixing hook 11b of the second fixing part 11 to correspond to the guide channel opening 36a of the first fixing part 3, the fixing column 11c corresponds to the limit channel opening 35a, and then the low-pressure storage unit 15 is pushed to enable the first side plate 31 of the first fixing part 3 to approach the second fixing part 11 until the fixing hook 11b is installed in the fixing hole 32a of the first fixing part 3, and assembly is completed. The assembly of the low-pressure storage unit 15 and the liner 2b can be completed by direct pushing, and the assembly is simple, convenient, quick and effective.

Fig. 23 to 26 are schematic structural views of an air duct mechanism of a low pressure storage unit of a refrigerator, the refrigerator 1 has a first air duct 10 communicating with a main air duct and disposed adjacent to the low pressure storage unit 15, as shown in fig. 23 to 26, the first air duct 10 extending forward along the top of the low pressure storage unit 15 to guide low temperature air to the front end of the low pressure storage unit 15, and simultaneously, the low temperature air cools the area around the first air duct 10 while the first air duct 10 circulates.

The first air duct 10 is flat, and the above arrangement can increase the overlapping area of the first air duct 10 and the low-pressure storage unit 15, thereby improving the cooling effect. Along the air outlet direction, the first air duct 10 may be configured as a divergent type to increase the overlapping area between the first air duct 10 and the front end of the low-pressure storage unit 15, so as to reduce the temperature difference between the front and rear of the low-pressure storage unit 15.

The front end portion of the first air duct 10 is provided with a first air outlet 10a located at the front end face thereof and a second air outlet 10b located at the lower end face 5b thereof. The first air outlet 10a guides the low-temperature air forward, diffuses the low-temperature air toward the front end portion of the low-pressure storage unit 15, and reduces the temperature difference between the front and rear of the low-pressure storage unit 15. The first air outlet 10a may be tapered along the air outlet direction, so as to increase the air speed and increase the air supply distance at the first air outlet 10 a. In this embodiment, a plurality of first air outlets 10a are arranged at intervals.

The second air outlet 10b guides the low temperature air to the top of the low pressure storage unit 15 and spreads at the top of the low pressure storage unit 15 centering around the second air outlet 10b to cover the low pressure storage unit 15. The second air outlet 10b may be provided to be gradually widened from the first air duct 10 toward the top of the low pressure storage unit 15 so as to mitigate the wind speed, and the low temperature air may be diffused around along the gap between the first air duct 10 and the low pressure storage unit 15 so as to cover the low pressure storage unit 15.

The distance between the forefront end of the first air duct 10 and the forefront end of the low-pressure storage unit 15 is L ₁, and the length of the low-pressure storage unit 15 in the front-rear direction is L ₂,L₁：L₂ e [0.2,0.8], which can efficiently diffuse low-temperature air to form a low-temperature environment around the low-pressure storage unit 15, thereby reducing the temperature inside the low-pressure storage unit 15.

In this way, the first duct 10 guides the low-temperature air to the peripheral side of the low-pressure storage unit 15 to surround the low-pressure storage unit 15, so that the low-temperature environment with a lower temperature than the other positions of the refrigerating chamber 12 can be maintained, and the refrigerating and fresh-keeping effects of the low-pressure storage unit 15 can be enhanced.

In this embodiment, a communication port for communicating with the main air duct is provided on the rear wall of the liner 2b, and the first air duct 10 is fixed to the communication port. It should be understood that the present invention should not be limited to the location of the first air duct 10 and the structure of the first air duct 10, and the present invention may be applied to other locations and other structures of the first air duct 10 adjacent to the low pressure storage unit 15 and guiding the low temperature air to the front end of the low pressure storage unit 15, for example, at the side of the low pressure storage unit 15.

Fig. 27 to 29 are schematic structural diagrams of a pressure detecting unit of a low-pressure storage unit of a refrigerator, and as shown in fig. 27 to 29, the refrigerator 1 is provided with a pressure detecting unit 9 which is arranged at the back of the low-pressure storage unit 15 and detects the pressure in the low-pressure storage unit 15 and is electrically connected with an air extracting device so as to monitor the pressure in the low-pressure storage unit 15, when the pressure in the low-pressure storage unit 15 is higher than a preset value and loses vacuum refrigeration effect, the pressure detecting unit 9 sends a vacuumizing signal to the air extracting device, and the air extracting device works to form a 'vacuum chamber', so that when the pressure of the low-pressure storage unit 15 is increased to reach the preset value due to unavoidable air leakage after a long time, the air extracting device can work in time so as to ensure the vacuum degree of the low-pressure storage unit 15, and thus the food preservation effect is ensured.

The pressure detection unit 9 has a column 91 protruding from the back of the low pressure storage unit 15, the column 91 having a first through hole 91a communicating with the low pressure storage chamber 14 of the low pressure storage unit 15, a rubber seal 92 sealing the end of the column 91 and a pressure switch 93 abutting against the rubber seal 92 being provided at one end of the column 91 remote from the low pressure storage unit 15, a spring 94 being provided between the rubber seal 92 and the bottom of the column 91, and a slider 95 being provided between the spring 94 and the rubber seal 92. When the pressure in the low-pressure storage unit 15 increases to a certain extent, the pressure in the first through hole 91a of the upright post 91 increases, the floating block 95 is acted by certain air pressure to push the rubber sealing member 92 to move against the tensile force of the spring 94, the rubber sealing member 92 is acted by the floating block 95 to apply pressure to the pressure switch 93 to trigger the pressure switch 93, the pressure switch 93 sends a control signal to the control unit, and the control unit controls the air extractor to vacuumize the low-pressure storage unit 15 according to the control signal. As a preferred embodiment of the present invention, the back area of the low pressure storage unit 15 surrounded by the first through hole 91a is provided with a mounting block 45 fixed with one end of a spring 94, the other end of the spring 94 is fixed with a floating block 95, one end of the upright post 91 away from the low pressure storage unit 15 is provided with a second through hole 91b with a radial dimension larger than that of the first through hole 91a so as to form a mounting table 46 for mounting a rubber seal 92 at one end of the upright post 91 away from the low pressure storage unit 15, the floating block 95 is in a T shape and comprises a floating plate 95a abutted with the rubber seal 92 and provided with a concave portion 95c at the central area, the radial dimension of the floating plate 95a is larger than that of the floating column 95b, the rubber seal 92 is in a round table shell shape with a supporting column 92a matched with the concave portion 95c on the floating plate 95a at the central area, and the size of the rubber seal 92 in a round table shell shape is smaller than that of the round table 46 at one end of the upright post 91 away from the mounting table 46.

The periphery of the upright post 91 is provided with a fixed table 47 for installing the pressure cover 55, one side of the pressure cover 55 is provided with an annular groove 56 matched with the upright post 91, the periphery of the groove 56 is provided with a fixed plate 57 corresponding to the fixed table 47, the other side of the pressure cover 55 is provided with a containing cavity 58 for installing the pressure switch 93, wherein the bottom of the containing cavity 58 is provided with a third through hole 58a for enabling the rubber sealing element 92 to be abutted against the pressure switch 93. In this embodiment, an elastic hook 58b for fixing the pressure switch 93 is disposed at the cavity opening of the accommodating cavity 58. The end of the upright post 91 is mounted in the annular groove 56 of the pressure cover 55, the inner groove wall of the annular groove 56 presses the rubber seal 92, and the fixing plate 57 is matched with the fixing table 47 and fixedly connected by a screw.

The pressure detection unit 9 and the low-pressure storage unit 15 are integrated, so that the detection accuracy of the pressure detection unit 9 is improved, the pressure detection unit 9 monitors the pressure in the low-pressure storage unit 15 in real time, and when the pressure in the low-pressure storage unit 15 is higher than a preset value and the vacuum refrigeration effect is lost, a vacuumizing signal is sent out to the air extractor in time so as to ensure the vacuum degree of the low-pressure storage unit 15, and further the fresh-keeping effect of food is ensured.

The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A refrigerator, characterized in that:

The box body defines an insulated storage room;

A low-pressure storage unit, housed in the storage room, from which air can be evacuated to form an air pressure lower than the atmospheric pressure outside the box;

A drain pipe is provided on the box body and is used to discharge condensed water inside the refrigerator;

The air extraction device comprises a vacuum pump, a first pipeline connecting the vacuum pump and the low-pressure storage unit, and a second pipeline connecting the vacuum pump and the drain pipe; the air extraction device comprises a pump housing and an elastic body sleeved between the pump body and the pump housing;

A vacuum pump is fixed in the storage room; it has an air extraction pipe connected to the low-pressure storage unit and an exhaust pipe connected to the drain pipe;

When the vacuum pump is working, the air in the low-pressure storage unit is transported to the drain pipe through the exhaust pipe, the vacuum pump and the drain pipe in sequence, and finally discharged from the box through the drain pipe;

A suction port connected to the suction pipe is provided at the top of the low-pressure storage unit near the rear end; the suction port faces the side of the storage room perpendicular to the front-to-back direction;

The drain pipe is provided with an exhaust port connected to the exhaust pipe; the exhaust pipe is connected to the exhaust port through a first pipeline, and the exhaust pipe is connected to the exhaust port through a second pipeline;

The vacuum pump is arranged on the rear wall of the storage room and close to the bottom of the low-pressure storage unit;

After being fixed to the exhaust port on the low-pressure storage unit, the first pipeline extends along the top edge of the rear end of the low-pressure storage unit, and then bends and turns 90° at the first turning position to extend to the second turning position; turns 90° again at the second turning position to extend downward to the third turning position; turns again at the third turning position to be connected with the exhaust pipe; wherein, on the projection of the plane where the bottom wall of the low-pressure storage unit is located, the projection of the second turning position and the projection of the third turning position are both located on the extension line of the projection of the exhaust pipe; the projection of the first turning position is located on the projection of the low-pressure storage unit, and the projection of the second turning position is located between the projection of the rear wall of the storage room and the projection of the rear wall of the low-pressure storage unit; the projection of the second turning position coincides with the projection of the third turning position.

2. The refrigerator according to claim 1 is characterized in that: on the projection of the plane where the bottom wall of the low-pressure storage unit is located, the line connecting the projection of the first turning position and the projection of the second turning position is perpendicular to the projection of the rear wall of the low-pressure storage unit.

3. The refrigerator according to claim 1 or 2, characterized in that the suction pipe and the exhaust pipe of the vacuum pump are arranged in parallel and are located at the same end of the vacuum pump.