CN109372731B

CN109372731B - Peristaltic pump

Info

Publication number: CN109372731B
Application number: CN201811420008.8A
Authority: CN
Inventors: 张建武
Original assignee: Zhuhai Yidong Intelligent Equipment Co ltd
Current assignee: Zhuhai Yidong Intelligent Equipment Co ltd
Priority date: 2017-04-06
Filing date: 2017-04-06
Publication date: 2020-10-20
Anticipated expiration: 2037-04-06
Also published as: CN109372731A; CN106884782B; CN106884782A

Abstract

The invention provides a peristaltic pump, which comprises a pump shell and a pump body, and comprises a rotatable extrusion roller, wherein a hose leading-in surface of the pump shell and a hose leading-out surface of the pump shell are positioned on the same side surface of the pump shell, the middle part of the pump shell is of a concave shape with an opening, the middle part of the pump shell is provided with a circular arc surface opposite to the opening, a first open slot and a second open slot of the pump shell are used for leading in and leading out a hose, and two sides of the middle part seal the opening part of the first open slot and the opening part of the second open slot. Hose accessible open slot is installed on the pump case, and the opening part of open slot can be sealed by the mid portion to realize the fixed of hose, when the hose needs to be changed, only need take off the mid portion moreover, can expose the hose, in order to realize light the change, convenient the maintenance.

Description

Peristaltic pump

Technical Field

The invention relates to the field of liquid pumps, in particular to a peristaltic pump. The present invention is based on the Chinese patent application with application date of 2017, 04 and 06 and application number of CN201710220216.2, and the contents of the above-mentioned inventions are incorporated herein by reference.

Background

The peristaltic pump pumps fluid by alternately squeezing and releasing an elastic delivery hose of the pump, and is generally used in the field of liquid metering and filling, such as medical detection and quantitative filling of chemical detection reagents, and the like.

When the peristaltic pump is used for conveying liquid, except for the hose, the conveyed product is not in direct contact with a pump body, the repeatability precision and the stability are high, any part of the pump cannot be damaged under the condition of no liquid idle running, and various medical reagents, chemical reagents, other materials, various foods and the like with corrosion and oxygen sensitivity can be conveyed. In use, only the hose is a component to be replaced, and the replacement operation is simple, so that the peristaltic pump is widely used for conveying various fluids.

Chinese utility model patent CN201953621U discloses such peristaltic pump head, including preceding fagging 6, back fagging 5, setting up last briquetting 8 and card pipe device 11 between preceding fagging and the back fagging, the gyro wheel device of setting in the centre bore department of preceding fagging and back fagging, be formed with first spout 51 between preceding fagging and the back fagging, be equipped with on the last briquetting with the slider 81 of first spout sliding fit, the bottom of first spout is equipped with the card and joins in marriage the clamping part (i.e. the draw-in groove) of slider. The upper pressing block 8 is pressed into the first sliding groove by utilizing the elasticity of the upper pressing block, is released after entering the clamping part, and is restored to the original shape by virtue of the elasticity of the upper pressing block and is automatically fixed at the working position. The utility model discloses a peristaltic pump head has following 3 problems, problem 1: the upper pressing block 8 must have elasticity, otherwise the assembly is difficult to complete; problem 2: the peristaltic pump head realizes the liquid delivery by matching the upper pressing block 8, the roller 12 and a hose (not shown) for delivering liquid, and the upper pressing block 8 has elasticity and low rigidity strength, is only suitable for one or two pipelines to deliver and cannot realize multi-pipeline delivery, and if the multi-pipeline delivery is needed, a plurality of peristaltic pumps are required to be connected in parallel and work simultaneously, so that the cost of liquid delivery is increased; problem 3: and because the upper pressing block 8 has elasticity, the pump head of the peristaltic pump is easy to deform after working for a long time, and the quantitative liquid conveying is difficult to ensure.

Disclosure of Invention

The invention aims to provide a peristaltic pump which is high in strength, multiple in pipelines and stable in conveying.

In order to achieve the above object, the present invention provides a peristaltic pump, comprising a pump housing and a pump body, wherein the pump body is arranged in the pump housing, the pump body comprises a rotatable squeeze roller, a hose leading-in surface of the pump housing and a hose leading-out surface of the pump housing are positioned on the same side surface of the pump housing, the pump housing comprises an upper pump housing, the lower pump shell and the middle part are fixedly connected, the middle part is of a concave shape with an opening, the middle part is provided with an arc surface opposite to the opening, a first open slot is formed between the arc surface of the middle part and the extrusion roller and used for placing a hose on the upper pump shell or the lower pump shell, the first open slot is used for allowing the hose to enter the pump shell, a second open slot is formed in the other side of the first open slot of the upper pump shell or the lower pump shell, the second open slot is used for leading the hose out of the pump shell, and the opening part of the first open slot and the opening part of the second open slot are sealed by two sides of the middle part.

According to the scheme, the hose can be arranged between the squeezing roller and the pump shell and is squeezed by the squeezing roller, the rotating disc drives the squeezing roller to rotate when rotating, so that liquid in the hose is conveyed along the rotating direction of the rotating disc, stable conveying of the liquid in the hose is achieved, and when the length of the squeezing roller is long, more pipelines can be arranged, and multi-pipeline conveying is achieved. The flexible pipe enters and exits from the same side face of the pump shell, and the flexible pipe can be extruded by the extrusion roller to push liquid in a larger range, so that the conveying is more stable. Hose accessible open slot is installed on the pump case, and the opening part of open slot can be sealed by the mid portion to realize the fixed of hose, when the hose needs to be changed, only need take off the mid portion moreover, can expose the hose, in order to realize light the change, convenient the maintenance.

It is further preferred that the first screw is placed on the upper pump casing and/or the lower pump casing, and a screw head of the first screw abuts against the intermediate portion.

From top to bottom, when changing the hose, owing to only need dismouting mid portion, so can make things convenient for the dismouting of mid portion through the setting of first screw to and mid portion's is fixed.

A partition wall is arranged on the arc surface, and a groove matched with the partition wall is arranged in the extrusion roller; or the extrusion roller is provided with a partition wall, and the arc surface is provided with a groove matched with the partition wall.

The further scheme is that transition surfaces are arranged at two ends of the arc surface, partition walls are arranged on the arc surface, the partition walls extend to the transition surfaces from the arc surface, and the grooves are formed in the extrusion roller.

The pump body further comprises a rotating disc and a driving shaft, the rotating disc comprises a first rotating disc and a second rotating disc which are opposite to each other and coaxially arranged, two ends of the squeezing roller are respectively supported by the first rotating disc and the second rotating disc, and the rotating disc is connected with the driving shaft to rotate around the central shaft of the rotating disc; the axis of the arc surface is coincided with the central axis, and the angle of the arc surface is 120-180 degrees.

It can be seen from above that, when peristaltic pump operating condition, during the partition wall can stretch into the recess, through the cooperation of partition wall and recess, realize the limiting displacement to the hose, avoid the hose off tracking to can avoid the hose between adjacent to take place to interfere. The transition surface is also provided with a partition wall, and the partition wall can realize the guide of the extrusion roller through the matching of the partition wall and the groove. The axis of the arc surface is coincident with the central axis, so that the hose is uniformly stressed within the range of the arc surface when the hose is extruded by the extrusion roller. The angle of the arc surface can be set to be 120-180 degrees, so that the hose can be squeezed by the squeezing rollers within the range of 120-180 degrees to push liquid, and the conveying is more stable. Through the setting of transition face, make the extrusion force of squeeze roll to the hose steadily transition, and then the hose is not fragile.

In a further development, the number of press rolls is at least three, the press rolls being arranged rotationally symmetrically about a central axis.

It is thus clear that setting up of three squeeze roll makes the carousel rotate the round and can realize the cubic extrusion of cubic to the hose and carry, rotates certain angle through the drive rolling disc, realizes the ration and carries, and the ration at every turn can be less than the round, also can be several rings, and the delivery capacity is directly proportional with rolling disc pivoted angle.

The pump shell is provided with a leakage collecting groove at the bottom, and the pump shell is provided with a wetting material communicated with the leakage collecting groove.

Therefore, when the hose in the pump shell leaks, the wetting material is firstly concentrated in the leaked liquid collecting tank, and the color of the wetting material is changed after the wetting material is contacted with liquid, so that the wetting material can be conveniently perceived, and the hose can be maintained or replaced in time.

In a further scheme, a guide strip is arranged on the lower pump shell, a guide groove is formed in the middle of the lower pump shell, and the guide strip is matched with the guide groove.

From the above, it can be seen that the setting of guide structure can realize the accurate location of middle part.

In a further aspect, the peristaltic pump further includes a flexible tube that enters the pump housing from the flexible tube entrance surface and the first open slot of the pump housing and exits from the flexible tube exit surface and the second open slot of the pump housing.

The further proposal is that the number of the hoses is more than two, and the hoses are arranged side by side along the axial direction of the squeezing roller.

It is thus clear that a plurality of hoses can set up side by side along the length direction of squeeze roll, and when the length of squeeze roll was longer, more pipeline can be arranged to realize that the multitube is carried.

Drawings

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

Fig. 2 is a schematic view of the first embodiment of the present invention as seen from the hose introduction face thereof.

Fig. 3 is a sectional view a-a of fig. 2.

Fig. 4 is a schematic structural view of a pump body in the first embodiment of the present invention.

Fig. 5 is a schematic structural view of the pump body and the hose according to the first embodiment of the present invention.

Fig. 6 is a schematic structural view of the intermediate portion in the first embodiment of the present invention.

Fig. 7 is a schematic structural view of the intermediate portion in the first embodiment of the present invention.

Fig. 8 is a structural view of a lower pump casing in the first embodiment of the invention;

fig. 9 is a schematic structural view of an intermediate portion in a second embodiment of the present invention.

Fig. 10 is a schematic structural view of an intermediate portion in a second embodiment of the present invention.

Fig. 11 is a schematic structural view of a pump body in a second embodiment of the present invention.

Fig. 12 is a schematic structural view of a pump body in a second embodiment of the present invention.

Fig. 13 is a sectional view B-B of fig. 12.

Fig. 14 is a schematic view of the second embodiment of the present invention as seen from the hose introduction face thereof.

Fig. 15 is a cross-sectional view C-C of fig. 14.

Fig. 16 is an exploded view of the first embodiment of the present invention.

Fig. 17 is a sectional view of the first embodiment of the present invention at an open groove.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

The first embodiment:

as shown in fig. 1, the peristaltic pump includes a pump housing 1 and a pump body located in the pump housing, the pump housing 1 is in a hexahedron shape as a whole, and includes an upper pump housing 11, a middle portion 12 and a lower pump housing 13, wherein the upper and lower pump housings are fixed by screws 3, the screws 4 are arranged on the upper pump housing 11 and the lower pump housing 13, and screw heads of the screws abut against the middle portion, so as to limit the middle portion 12 from being separated from the upper pump housing 11 or the lower pump housing. The pump housing 1 is made of a rigid material and has no elasticity. The pump housing 1 may be made of a metal material, plastic, or other rigid material. Of course, the screws 4 are arranged on the upper pump housing 11 or the lower pump housing 13, the head of which also enables a positional fixation of the intermediate part 12.

As shown in fig. 2, the hose 5 enters the pump housing 1 from one side of the pump housing 1, which is the hose inlet surface, and the hose 5 is also led out from the side, which is the same side of the pump housing 1 as the hose outlet surface. The side surface is also provided with a wetting material 6, and the wetting material 6 is communicated with a leakage collecting tank in the pump shell.

Referring to fig. 3 and 4, the pump body 2 is disposed in the pump housing, and includes a first rotating disk 21, a second rotating disk 22, a main shaft 23 connecting the first rotating disk 21 and the second rotating disk 22, and squeeze rollers 24 disposed at two ends of the main shaft and supported by the first rotating disk 21 and the second rotating disk 22, respectively, an end of the main shaft 23 is connected to the driving shaft as a rotating disk, a bearing 26 may be mounted on an outer side of the main shaft 23, so that the rotating disk rotates more flexibly, wherein two ends of the main shaft 23 may be connected to the driving shaft to drive the rotating disk to rotate, thereby driving may be more flexible, mounting may be more convenient, and transportation in two directions may be easily achieved. The central axis of the rotating disc coincides with the central axis of the main shaft 23, three squeeze rollers 24 are disposed at equal intervals and centrosymmetrically with respect to the central axis, a hose for conveying a liquid is disposed between the squeeze rollers 24 and the middle portion 12 of the pump housing and is squeezed by the squeeze rollers 24 and the middle portion 12, and a virtual position when the hose is not squeezed is shown by a dotted line in fig. 3.

The first rotary disk 21 is located in the upper pump casing 11, the main shaft 23 is extended to be exposed from the top surface of the upper pump casing 11 to be connected to the drive shaft, the second rotary disk 22 is located in the cavity of the lower pump casing 13, the leaked liquid collecting groove 131 is located between the second rotary disk 22 and the bottom surface of the cavity, and the wetting material 6 is communicated with the leaked liquid collecting groove 131.

As shown in fig. 5, the portion of the hose 5 within the pump housing includes a nipple 51 and a connecting hose 52. In which the adapter 51 is fixed to the pump housing 1 so that the connecting hose 52 can be positioned accurately.

As shown in fig. 6, the middle portion 12 is of a "concave" shape having an opening, and a surface opposite to the opening is an arc surface 123, and an axis of the arc surface 123 coincides with a central axis, so that when the connection hose 52 is pressed by the pressing roller, the connection hose 52 is uniformly applied with force. As shown in fig. 7, the angle α of the arc surface is 120 degrees to 180 degrees (may not include 120 degrees nor 180 degrees), the hose can be squeezed by the squeezing roller within the range of 120 degrees to 180 degrees to push liquid, so that the conveying is more stable, and the surface connected with the arc surface 123 can be an inclined surface or other transition surface. At the transition surface, when the connecting hose 52 is squeezed by the squeezing rollers 24, the squeezing force is smaller than that at the arc surface 123, and along with the proximity of the arc surface 123, the squeezing force applied to the connecting hose 52 is gradually increased, so that the smooth transition of the squeezing force is realized, and the connecting hose 52 is not easy to damage. The bottom surface 121 of the intermediate section 12 is provided with guide slots 122 to cooperate with guide strips 132 provided on the lower pump casing 13, see fig. 8, to facilitate the mounting and positioning of the intermediate section 12. The joint 51 is caught in the open groove 133 on the lower pump case 13, and the middle portion 12 closes the open portion of the open groove 133. Screw holes 134 on the lower pump casing 13 are used to mount screws 3 for fixation with the upper pump casing 11.

Referring to fig. 16 and 17, fig. 16 is an exploded view of a peristaltic pump, fig. 17 is a cross-sectional view of an open slot, in operation, the two side joints 51 are respectively connected with an input hose and an output hose, and form a passage with a connection hose 52 in a pump housing 1, a driving shaft is driven by a motor or other driving device to rotate, a rotating disc drives a squeezing roller 24 to rotate along a conveying direction through a main shaft 21, and liquid in the connection hose 52 is squeezed and pushed to be conveyed quantitatively along the conveying direction, so that the liquid flows from the input hose to the output hose stably.

When the connection hose 52 or the joint 51 is partially leaked, the leaked liquid flows into the leaked liquid collecting groove 131, and the color of the wetting material 6 communicated with the leaked liquid collecting groove 131 is changed, thereby alerting a user to the occurrence of a leakage. At this time, the screw 4 is removed, the middle part 12 is removed in the direction away from the hose introduction face to expose the connection hose 52 and the joint 51, after the connection hose or the joint with problems is checked or replaced, the middle part 12 is inserted back, the guide groove 122 slides along the guide strip 133 until the two sides of the middle part 12 completely close the opening part of the open groove 133 and the other side opposite to the hose introduction face, the middle part 12 is positioned on the same plane with the upper pump shell 11 and the lower pump shell 13, the peristaltic pump can be reused, and the upper pump shell 11 and the lower pump shell 13 are fixedly connected through the screw 3 and the screw hole 134, so that the upper pump shell 11 and the lower pump shell 13 do not need to be separated during replacement.

Second embodiment:

the second embodiment further improves the structure of the squeeze rollers 24 and the intermediate portion 12 with respect to the first embodiment.

Referring to fig. 9 and 10, the arc surface 123 of the middle portion 12 is provided with 2 arc-shaped partition walls 124 along the axial direction, and both ends of the arc-shaped partition walls 124 extend from the arc surface 123 to the transition surface. Referring to fig. 11 to 13, 2 annular grooves 241 are provided on the circumference of the pressed roll 24 to be engaged with the arc-shaped partition walls 124. Referring to fig. 15, when the peristaltic pump is in an operating state, the arc-shaped partition wall 124 extends into the annular groove 241, the action of limiting the hose is realized through the matching of the arc-shaped partition wall 124 and the annular groove 241, the hose is prevented from deviating, and the partition wall at the transition surface can guide the squeezing rollers 24. In other embodiments, the dividing walls may be provided on the squeeze roll to form annular dividing walls, while the recesses provided in the intermediate portion to mate with the dividing walls are formed as arcuate recesses.

The figures show that two curved partition walls are used to separate 3 hose receiving spaces by cooperating with two annular grooves, respectively, so as to avoid interference between adjacent hoses. It is understood that the number of the arc-shaped partition walls and the annular grooves is not limited to 2, and the number of the arc-shaped partition walls and the annular grooves may be determined according to the number of the hoses.

In other embodiments, the two rotating disks may be fixedly connected by a plurality of connecting rods rather than a main shaft; the number of the hoses can be two or four; the number of the extrusion rollers can be two or four; the middle part can be provided with a guide strip and the lower pump shell is provided with a guide groove; the mounting guide structure of the intermediate portion may be provided on the upper pump casing and the intermediate portion; the open slot can be arranged on the upper pump shell; the upper pump casing or the lower pump casing may be provided with other restricting structures for restricting the disengagement of the intermediate portion in a direction away from the introduction face of the hose, instead of screws, such as pivotable stoppers and the like.

It will be appreciated that the peristaltic pump of the present invention may be used to deliver a variety of liquids, fluids, including medical agents having corrosive, oxygen sensitive properties, chemical agents, other materials, and various food products, etc.

Claims

1. The peristaltic pump comprises a pump shell and a pump body, wherein the pump body is arranged in the pump shell, the pump body comprises rotatable squeezing rollers, the number of the squeezing rollers is at least three, and the squeezing rollers are arranged in a rotational symmetry manner, and the peristaltic pump is characterized in that:

the hose leading-in surface of the pump shell and the hose leading-out surface of the pump shell are positioned on the same side surface of the pump shell, the pump shell comprises an upper pump shell, a lower pump shell and a middle part, the upper pump shell and the lower pump shell are fixedly connected, the middle part is of a concave shape with an opening, the middle part is provided with an arc surface opposite to the opening, and a hose is placed between the arc surface of the middle part and the extrusion roller;

the upper pump shell or the lower pump shell is provided with a first open slot, the first open slot is used for allowing the hose to enter the pump shell, the other side of the first open slot of the upper pump shell or the lower pump shell is provided with a second open slot, the second open slot is used for leading the hose out of the pump shell, and the two sides of the middle part seal the opening part of the first open slot and the opening part of the second open slot;

the arc surface is provided with an arc-shaped partition wall, the circumference of the extrusion roll is provided with an annular groove matched with the arc-shaped partition wall, and the arc-shaped partition wall extends into the annular groove;

or, the extrusion roll is provided with an annular partition wall, an arc-shaped groove matched with the annular partition wall is formed in the arc surface, and the annular partition wall extends into the arc-shaped groove.

2. A peristaltic pump as set forth in claim 1, wherein:

first screws are placed on the upper pump casing and/or the lower pump casing, and screw heads of the first screws abut against the middle portion.

3. A peristaltic pump as set forth in claim 2, wherein:

transition surfaces are arranged at two ends of the arc surface;

the arc-shaped partition wall is arranged on the arc surface, extends to the transition surface from the arc surface, and the annular groove is formed in the extrusion roller.

4. A peristaltic pump as claimed in claim 3, wherein:

the pump body comprises a rotating disc and a driving shaft, the rotating disc comprises a first rotating disc and a second rotating disc which are opposite to each other and coaxially arranged, two ends of the squeezing roller are respectively supported by the first rotating disc and the second rotating disc, and the rotating disc is connected with the driving shaft to rotate around a central shaft of the rotating disc;

the axis of the arc surface is coincided with the central axis, and the angle of the arc surface ranges from 120 degrees to 180 degrees.

5. A peristaltic pump as claimed in claim 4, wherein:

the squeeze rollers are arranged in a rotationally symmetrical manner about the central axis.

6. A peristaltic pump as claimed in claim 5, wherein:

the bottom of the pump shell is provided with a leakage collecting tank, and the pump shell is provided with a wetting material communicated with the leakage collecting tank.

7. A peristaltic pump as set forth in claim 1, wherein:

the lower pump shell is provided with a guide strip, the middle part is provided with a guide groove, and the guide strip is matched with the guide groove.

8. A peristaltic pump as claimed in any one of claims 1 to 7, wherein:

the number of the hoses is more than two, and the hoses are arranged side by side along the axial direction of the squeezing rollers.