CN211777873U - Square linear compressor - Google Patents

Abstract

The utility model relates to the technical field of linear compressors, and discloses a square linear compressor. In the base, one end of the mover part is inserted into the air gap formed by the stator part; the cylinder piston assembly includes a piston and a cylinder, the cylinder is fixed on the base, and the end of the piston is flexibly connected to the other end of the mover part; The front end is reciprocatingly installed in the cylinder, the front end wall of the piston and the cylinder are surrounded by a compression chamber, and the front end wall of the piston is provided with a suction valve; at least one piston is provided with a suction hole, and the compression chamber of at least one cylinder is provided with Vent. The square linear compressor is flexibly connected to the mover component through a plurality of cylinder piston assemblies, so as to realize the circumferential positioning of the square mover component, which can prevent the circumferential rotation of the mover component of the square linear motor and prevent the mover from being stuck.

Description

Square Linear Compressor

technical field

The utility model relates to the technical field of linear compressors, in particular to a square linear compressor.

Background technique

An air compressor is a fluid machine that converts the mechanical energy of the prime mover into gas energy, and is used to pressurize and transport gas. The traditional piston air compressor is mainly driven by a rotary motor, and the rotary motion of the rotor of the rotary motor is transformed into the reciprocating linear motion of the piston through the crank, the connecting rod slider and the piston rod. This type of compressor has complex structure, many wearing parts and low mechanical efficiency.

In 1992, Beale and Redlich in the United States proposed a moving magnet linear oscillating motor with a Redlich structure. The moving magnet linear oscillating motor of this structure is to install a magnetic conductive material on the circumference of the excitation coil to form a concentric with the excitation coil. The magnetic circuit structure of the cylindrical air gap is composed of cylindrical inner and outer stators to form an air gap, and the radially magnetized cylindrical permanent magnets reciprocate in the air gap. The Redlich type linear motor has the advantages of better magnetic circuit structure design and small magnetic circuit loss. The existing technical application uses a cylindrical linear oscillating motor of Redlich structure as a driver, and the cylinder and piston components are arranged in the cylinder of the inner stator. The structure makes the heat generated in the process of compressing the gas of the linear compressor and the heat generated by the motor itself affect each other, which affects the compression efficiency. At the same time, the overall structure of the compressor tends to be short and tall. The shape of this cylindrical structure compressor is characterized by a relatively small length and diameter, which tends to be short and high. It is also difficult to assemble the inner and outer stators radially on the circumference.

For some small refrigeration devices, especially refrigerators, refrigerators and other equipment, the low-height horizontal and slender square linear compressor occupies a small space, which can increase the effective use space of the equipment, but the square linear compressor is in the working process. When under load, the mover components will rotate circumferentially, which will cause wear on the contact surfaces, resulting in structural instability.

Utility model content

The embodiment of the present utility model provides a square linear compressor, which is used to solve the problems that the mover components of the existing square linear compressor are prone to circumferential rotation, resulting in wear of the contact surface and unstable structure.

An embodiment of the present utility model provides a square linear compressor, which includes a frame, a square linear oscillating motor and a plurality of cylinder piston assemblies. The square linear oscillating motor includes a stator part and a mover part, and the stator part is fixed to the the frame, one end of the mover part is inserted into the air gap formed by the stator part;

The cylinder-piston assembly includes a piston and a cylinder, the cylinder is fixedly connected to the machine base, the end of the piston is flexibly connected to the other end of the mover component; the front end of the piston is reciprocatingly installed on the In the cylinder, the front end wall of the piston and the cylinder are surrounded by a compression chamber, and the front end wall of the piston is provided with a suction valve; at least one of the pistons is provided with a suction hole, and at least one of the cylinders is The compression chamber is provided with an exhaust valve, so that the gas enters the compression chamber through the suction hole, and is compressed and discharged from the cylinder through the exhaust valve.

Wherein, n cylinder-piston assemblies in the plurality of cylinder-piston assemblies are sequentially connected to form an n-stage compression mechanism, and n is an integer greater than or equal to 2;

The front end of the nth stage piston of the nth stage cylinder piston assembly divides the interior of the nth stage cylinder into the nth stage suction chamber and the nth stage compression chamber, and the front end of the nth stage piston is provided with a through hole to connecting the n-th stage suction chamber and the n-th stage compression chamber; the n-th stage compression chamber discharges the compressed gas through the n-th stage exhaust valve;

When n is greater than 2, the front end of the n-1st stage piston of the n-1st stage cylinder piston assembly divides the interior of the n-1st stage cylinder into the n-1st stage suction chamber and the n-1st stage compression chamber , and the front end of the n-1st stage piston is provided with a through hole to communicate with the n-1st stage suction chamber and the n-1st stage compression chamber; the n-1st stage compression chamber passes through the The n-1 stage exhaust valve is connected to the closed n-1 stage exhaust cavity; the n-1 stage exhaust cavity is connected to the nth stage suction cavity through the nth stage suction passage;

The front end wall of the first-stage piston of the first-stage cylinder-piston assembly and the first-stage cylinder are surrounded by a first-stage compression chamber, and the first-stage piston is provided with the suction hole, so that the gas can enter through the suction hole. the first-stage compression chamber; the first-stage compression chamber is communicated to the closed first-stage exhaust chamber through the first-stage exhaust valve; the first-stage exhaust chamber is communicated to the closed first-stage exhaust chamber through the second-stage suction passage Second stage suction chamber.

Wherein, at least one of the plurality of cylinder piston assemblies is a single-stage compression cylinder piston assembly, the single-stage compression cylinder piston assembly includes a single-stage piston and a single-stage cylinder, and the single-stage piston is provided with the suction hole The compression chamber of the single-stage cylinder is provided with a single-stage exhaust valve, so that the gas enters the compression chamber of the single-stage cylinder through the suction hole, and is compressed and discharged through the single-stage exhaust valve. The single-stage cylinder.

Wherein, at least one of the plurality of cylinder piston assemblies is a gas spring cylinder piston assembly, the gas spring compression cylinder piston assembly includes a gas spring piston and a gas spring cylinder, and the gas spring piston is provided with the suction hole, so The compression cavity of the gas spring cylinder is a closed cavity, so that the gas enters the compression cavity of the gas spring cylinder through the suction hole, and is compressed to form a gas spring.

Wherein, the stator part includes two E-shaped middle magnetic conductor stators, two side magnetic conductor stators and a coil winding; the openings of the two middle magnetic conductor stators are arranged oppositely, and the coil windings are sleeved on the two in the opening of the middle magnetic conductor stator; the two side magnetic conductor stators are respectively arranged on both sides of the middle magnetic conductor stator at intervals to form two sets of the air gaps;

The mover component includes two sheet-shaped permanent magnets respectively inserted in the air gap.

Wherein, the mover component further includes a mover support, and the two sheet-shaped permanent magnets are installed on both ends of one side of the mover support in parallel with each other; one side of the mover support passes through the first resonance The spring is connected to the stator part, the other side of the mover bracket is connected to the cylinder through a second resonance spring, and the axes of the first resonance spring and the second resonance spring are parallel to each other.

Wherein, the outer edge of the mover bracket is provided with a spring positioning flange for installing the first resonance spring, and the middle part of the mover bracket is provided with a spring positioning recess for installing the second resonance spring.

The suction valve is a suction valve plate with one end fixed on the front end wall of the piston; one end of the exhaust valve is pressed against the exhaust port of the compression chamber, and the other end of the exhaust valve passes through A preload spring is connected to the cylinder.

Wherein, an oil pump is also included, and the oil pump is used for pumping lubricating oil to the motion interface of the cylinder and the piston.

Wherein, the flexible connection between the piston and the mover component includes piston pin connection, ball head connection or elastic threaded screw connection.

The square linear compressor provided by the embodiment of the present utility model includes a frame, a square linear oscillating motor and a plurality of cylinder piston assemblies. The mover part of the square linear oscillating motor is inserted into the air gap formed by the stator part, and is driven by electromagnetic force. The mover part reciprocates; the number of cylinder-piston assemblies is at least two, each cylinder-piston assembly includes a piston and a cylinder, the end of the piston is flexibly connected to the mover part, and the front end of the piston is reciprocatingly installed in the cylinder to The reciprocating motion of the mover part is transmitted to the piston to generate compressed gas, while at least two pistons are flexibly connected to the mover part to realize the circumferential positioning of the square mover part. The square linear compressor is flexibly connected to the mover part through a plurality of cylinder piston assemblies, so as to realize the circumferential positioning of the square mover part, which can prevent the circumferential rotation of the mover part of the square linear motor and avoid the mover being stuck. to improve the stability of the structure.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative work.

1 is a cross-sectional view of a square linear compressor in an embodiment of the present invention from a top view;

Fig. 2 is the front view of the square linear compressor in Fig. 1;

Fig. 3 is the sectional view under the front view angle of the square linear compressor in Fig. 1;

4 is a cross-sectional view of another square linear compressor in an embodiment of the present invention from a top view;

Fig. 5 is the front view of the square linear compressor in Fig. 4;

Fig. 6 is the sectional view under the front view angle of the square linear compressor in Fig. 4;

7 is a cross-sectional view of another square linear compressor in an embodiment of the present invention from a top view;

FIG. 8 is a front view of the square linear compressor in FIG. 7;

FIG. 9 is a cross-sectional view of the square linear compressor in FIG. 7 from a front view angle.

Description of reference numbers:

1. Machine base; 2. Middle magnetic conductor stator; 3. Side magnetic conductor stator;

4. Coil winding; 5. Air gap; 6. Permanent magnet;

7. The mover bracket; 8. The first resonance spring; 9. The second resonance spring;

10. Oil pump; 11. Piston pin; 12. Suction hole;

13. First-stage cylinder piston assembly; 131. First-stage cylinder;

132, the first stage piston; 133, the first stage compression chamber; 134, the first stage exhaust valve;

135. The first-stage cylinder head; 136. The first-stage suction valve; 137. The first-stage preload spring;

138. The first stage exhaust chamber;

14. Second-stage cylinder piston assembly; 141. Second-stage cylinder;

142, the second stage piston; 143, the second stage compression chamber; 144, the second stage exhaust valve;

145, the second-stage cylinder head; 146, the second-stage suction valve; 147, the second-stage preload spring;

148, second-stage exhaust chamber; 149, second-stage suction passage; 140, second-stage suction chamber;

15. Oil supply passage; 16. The first single-stage cylinder; 17. The second single-stage cylinder;

18. The first single-stage piston; 19. The second single-stage piston; 20. The single-stage suction valve;

21. Single-stage exhaust valve; 22. Single-stage preload spring; 23. Single-stage exhaust chamber;

24. Single-stage cylinder head; 25. Gas spring cylinder; 26. Gas spring piston;

27. Gas spring suction valve.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the embodiments of the present utility model, it should be noted that, unless otherwise expressly specified and limited, the terms "first" and "second" are used to clearly describe the numbering of product components and do not represent any substantial difference. "Up", "Down", "Left", "Right", etc. are only used to indicate relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

It should be noted that, unless otherwise expressly specified and limited, the term "connection" should be understood in a broad sense, for example, it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the utility model can be understood in specific situations.

As shown in FIGS. 1 to 9 , a square linear compressor provided by an embodiment of the present invention includes a frame 1 , a square linear oscillating motor and a plurality of cylinder-piston assemblies. The square linear oscillating motor includes a stator part and a mover part, the stator part is fixed on the machine base 1 , and one end of the mover part is inserted into the air gap 5 formed by the stator part. Specifically, the machine base 1 includes a bottom plate and three vertical plates vertically erected on the bottom plate and parallel to each other. The two vertical plates on the left are used for fixing the square linear oscillating motor, and the one vertical plate on the right is used for fixing multiple vertical plates. A cylinder piston assembly. The shape of the square linear oscillating motor is rectangular, which can meet the space utilization requirements of some small refrigeration devices, such as low-height horizontal equipment such as refrigerators and freezers. At the same time, compared with the inner and outer stators of the cylindrical motor, which need to be radially assembled on the circumference, the assembly of the square linear oscillating motor is simpler. The square linear oscillating motor mainly uses electromagnetic force to generate vibration, and then combined with mechanical resonance to push the piston to reciprocate and vibrate the compressed gas. The square linear oscillating motor can adopt a moving magnet type, a moving coil type or a moving iron type. In this embodiment, the moving magnet type is mainly used. Take an example to illustrate.

The number of cylinder-piston assemblies is greater than or equal to two, and the arrangement of multiple cylinder-piston assemblies can be various, for example, two cylinder-piston assemblies are arranged along the length or height direction of the square linear oscillating motor, or three or more The cylinder and piston components of the cylinder are arranged in a circle or in a collinear arrangement. The specific arrangement can be designed according to the actual use requirements. There is no restriction here, as long as the axial direction of the piston is parallel to the movement direction of the mover component. Compared with the existing square linear compressor, which is only provided with a single cylinder-piston assembly at the central axis, when the square linear motor has unstable circumferential rotation, the present embodiment can generate a countermeasure by arranging multiple cylinder-piston assemblies. To prevent the mover components from rotating in the circumferential direction, so that the motor runs more stably.

The cylinder-piston assembly includes a piston and a cylinder, the cylinder is fixedly connected to the base 1, and the end of the piston is flexibly connected to the other end of the mover component to prevent the mover of the square linear oscillating motor from being stuck. The flexible connection mode here includes piston pin 11 connection, ball head connection, or elastic threaded screw connection, and the like. The elastic thread screw connection is to process a spring wire into the form of a screw. This embodiment is described by taking the connection of the piston pin 11 as an example. As shown in FIG. 3 , both ends of the piston pin 11 are fixed to the mover component by threads, and the end of the piston is sleeved on the middle of the piston pin 11 and can be wound around the piston pin. The axis of 11 rotates, so that when the linear oscillation motor is deflected in the circumferential direction, it can be prevented from being stuck by a flexible connection such as the piston pin 11.

The front end of the piston is reciprocatingly installed in the cylinder, the front end wall of the piston and the cylinder are enclosed to form a compression chamber, and the front end wall of the piston is provided with a suction valve. When the piston moves towards the mover, a certain negative pressure is formed in the cylinder, the suction valve opens, and the gas enters the compression chamber through the suction valve; when the piston moves away from the mover, the gas in the compression chamber is compressed by the piston, and the gas enters the compression chamber. The pressure rises, and when the pressure reaches a certain value, the exhaust valve opens and the gas is discharged out of the compression chamber.

Among the plurality of cylinder-piston assemblies, the piston of at least one cylinder-piston assembly is provided with a suction hole, and the compression chamber of the cylinder of at least one cylinder-piston assembly is provided with an exhaust valve, so that the gas enters the compression chamber through the suction hole, and After being compressed, it is discharged from the cylinder through the exhaust valve. The cylinder-piston assembly can have various forms, such as a single-cylinder single-stage compression structure, a multi-cylinder single-stage compression structure, a multi-cylinder multi-stage compression structure, or a gas spring resonance structure, etc. The multiple cylinder-piston assemblies in this embodiment The above-mentioned various forms of structures can be freely arranged and combined, as long as it is ensured that the number of cylinder-piston assemblies is greater than or equal to two.

A square linear compressor provided by this embodiment includes a frame, a square linear oscillating motor and a plurality of cylinder-piston assemblies. The mover part of the square linear oscillating motor is inserted into the air gap formed by the stator part, and is driven by electromagnetic force. The mover part reciprocates; the number of cylinder-piston assemblies is at least two, each cylinder-piston assembly includes a piston and a cylinder, the end of the piston is flexibly connected to the mover part, and the front end of the piston is reciprocatingly installed in the cylinder to The reciprocating motion of the mover part is transmitted to the piston to generate compressed gas, while at least two pistons are flexibly connected to the mover part to realize the circumferential positioning of the square mover part. The square linear compressor is flexibly connected to the mover part through a plurality of cylinder piston assemblies, so as to realize the circumferential positioning of the square mover part, which can prevent the circumferential rotation of the mover part of the square linear motor and avoid the mover being stuck. to improve the stability of the structure.

Further, as shown in FIG. 1 to FIG. 3 , n cylinder-piston assemblies in the plurality of cylinder-piston assemblies are sequentially connected to form an n-stage compression mechanism, where n is an integer greater than or equal to 2;

The front end of the nth stage piston of the nth stage cylinder piston assembly divides the interior of the nth stage cylinder into the nth stage suction chamber and the nth stage compression chamber, and the front end of the nth stage piston is provided with a through hole to communicate with the nth stage The n-stage suction cavity and the n-stage compression cavity; the n-stage compression cavity discharges the compressed gas through the n-stage exhaust valve.

When n is greater than 2, the front end of the n-1st stage piston of the n-1st stage cylinder piston assembly divides the interior of the n-1st stage cylinder into the n-1st stage suction chamber and the n-1st stage compression chamber , and the front end of the n-1st stage piston is provided with a through hole to connect the n-1st stage suction chamber and the n-1st stage compression chamber; the n-1st stage compression chamber passes through the n-1st stage exhaust valve. Connected to the closed n-1 stage exhaust cavity; the n-1 stage exhaust cavity is connected to the n-th stage suction cavity through the n-th stage suction channel; when n is greater than 2, the second stage to the n-th stage Stage 1 cylinder piston assemblies are all the same.

When n=2, there are only two stages of cylinder piston assemblies, namely the first stage and the second stage, and the second stage is the nth stage.

The front end wall of the first-stage piston 132 of the first-stage cylinder-piston assembly 13 and the first-stage cylinder 131 are surrounded by a first-stage compression chamber 133, and the first-stage piston 132 is provided with an air suction hole 12, so that the gas can be sucked through The hole 12 enters the first-stage compression cavity 133; the first-stage compression cavity 133 is connected to the closed first-stage exhaust cavity 138 through the first-stage exhaust valve 134; the first-stage exhaust cavity 138 passes through the second-stage suction passage 149 communicates to the second stage suction chamber 140 .

As shown in FIG. 1 to FIG. 3 , this embodiment takes n=2 as an example for specific description.

The first-stage cylinder-piston assembly 13 includes a first-stage cylinder 131, a first-stage piston 132, a first-stage compression chamber 133, a first-stage exhaust valve 134, a first-stage cylinder head 135, a first-stage intake valve 136, The first-stage preload spring 137 and the first-stage exhaust cavity 138, the first-stage cylinder 131 can be a cylinder with both ends open, and a closed first-stage cylinder head 135 is fixed to the right end of the first-stage cylinder 131 to form In the closed first-stage exhaust cavity 138, the first-stage exhaust valve 134 is pressed against the right end opening of the first-stage cylinder 131 by the first-stage preload spring 137 installed on the inner wall of the first-stage cylinder head 135, The first stage preload spring 137 may be a cone spring, a column spring or a leaf spring. The first-stage piston 132 may be stepped, the diameter of the front end of the first-stage piston 132 is larger than the diameter of the end, and the front-end wall surface of the first-stage piston 132, the first-stage cylinder 131 and the first-stage exhaust valve 134 are jointly set to form a first-stage piston. Stage compression chamber 133 .

The first-stage suction valve 136 is located in the first-stage compression chamber 133, and can be in the form of a suction valve plate, and a suction port is opened on the suction valve plate. The size of the suction valve plate may be slightly larger than the inner diameter of the first-stage cylinder 131, and the suction valve plate has a certain flexibility. One end of the suction valve plate is fixed to the first-stage piston 132 , and the other end of the suction valve plate can be attached to or away from the first-stage piston 132 with the reciprocating motion of the first-stage piston 132 , and the first-stage piston 132 The position of the suction hole 12 corresponds to the closed valve body part on the suction valve plate, and the suction port is staggered. Therefore, when the suction valve plate is attached to the first-stage piston 132, the suction hole 12 is blocked, and the suction The valve plate is in a closed state; when the other end of the intake valve plate is away from the first-stage piston 132, the intake hole 12 is opened, and the intake valve plate is in an open state. When the first-stage piston 132 moves to the left, the gas enters the first-stage compression chamber 133 through the suction hole 12 and the suction port of the suction valve plate; when the first-stage piston 132 moves to the right, the suction valve plate The gas in the first-stage compression chamber 133 is compressed until the pressure in the first-stage compression chamber 133 exceeds the first-stage preload spring 137 The pre-tightening force, the first-stage exhaust valve 134 is pushed open, and the compressed gas enters the first-stage exhaust chamber 138 .

The second-stage cylinder-piston assembly 14 includes a second-stage cylinder 141, a second-stage piston 142, a second-stage compression chamber 143, a second-stage exhaust valve 144, a second-stage cylinder head 145, a second-stage intake valve 146, The second-stage preload spring 147 , the second-stage exhaust cavity 148 , the second-stage suction passage 149 and the second-stage suction cavity 140 . The second-stage cylinder 141 is a cylinder with a closed left end and an open right end, and the second-stage cylinder 141 may share a cylinder wall with the first-stage cylinder 131 . A second-stage cylinder head 145 is fixedly connected to the right end of the second-stage cylinder 141 , and an exhaust port for outputting compressed gas is provided on the second-stage cylinder head 145 . The second-stage exhaust valve 144 is pressed against the right end opening of the second-stage cylinder 141 by the second-stage preload spring 147 installed on the inner wall of the second-stage cylinder head 145 , and the second-stage preload spring 147 may be a cone. Spring, column spring or leaf spring.

The second-stage piston 142 is also stepped, but different from the first-stage piston 132, the second-stage piston 142 is not provided with an air intake hole 12 that communicates with the outside world, and the front end of the second-stage piston 142 connects the second-stage cylinder The interior of 141 is divided into a second-stage suction chamber 140 and a second-stage compression chamber 143, and the front end of the second-stage piston 142 is provided with a through hole to communicate with the second-stage suction chamber 140 and the second-stage compression chamber 143, The second-stage suction chamber 140 is in turn communicated with the first-stage exhaust chamber 138 through the second-stage suction passage 149, so as to inhale the gas compressed by the first-stage. The second-stage suction valve 146 is located in the second-stage compression chamber 143, and can also be in the form of a suction valve plate. When the second-stage piston 142 moves to the left, the gas in the second-stage suction chamber 140 after the first-stage compression enters the first-stage compressed gas through the through hole of the second-stage piston 142 and the suction port of the suction valve plate. Inside the secondary compression chamber 143; when the secondary piston 142 moves to the right, the suction valve plate is close to the front end wall of the secondary piston 142, thereby blocking the through hole of the secondary piston 142, and the secondary compression chamber The gas in 143 is compressed in the second stage; until the pressure in the second stage compression chamber 143 exceeds the preload force of the second stage preload spring 147, the second stage exhaust valve 144 is pushed open, and after two stages of compression The gas enters the second stage discharge chamber 148 and is discharged from the compressor.

In this embodiment, a multi-stage compression mechanism is formed by connecting a plurality of cylinder-piston assemblies in sequence, so that a single compressor can form multi-stage compression, which is beneficial to reduce the pressure ratio of single-stage compression and improve the efficiency of the compressor.

Further, as shown in FIGS. 4 to 6 , at least one of the plurality of cylinder piston assemblies is a single-stage compression cylinder piston assembly, and the single-stage compression cylinder piston assembly includes a single-stage piston and a single-stage cylinder, and the single-stage piston is provided with a suction Air hole 12, the compression chamber of the single-stage cylinder is provided with a single-stage exhaust valve 21, so that the gas enters the compression chamber of the single-stage cylinder through the suction hole 12, and is compressed and discharged to the single-stage cylinder through the single-stage exhaust valve 21 . Specifically, as shown in FIG. 4 , this embodiment takes two single-stage compression cylinder piston assemblies as examples for description. The principles and structures of the first single-stage compression cylinder piston assembly and the second single-stage compression cylinder piston assembly are roughly the same, The first single-stage compression cylinder piston assembly includes a first single-stage cylinder 16 , a first single-stage piston 18 , a single-stage intake valve 20 , a single-stage exhaust valve 21 , a single-stage preload spring 22 , and a single-stage exhaust chamber 23 and a single-stage cylinder head 24; the second single-stage compression cylinder piston assembly includes a second single-stage cylinder 17, a second single-stage piston 19, a single-stage intake valve 20, a single-stage exhaust valve 21, and a single-stage preload spring 22 , a single-stage exhaust chamber 23 and a single-stage cylinder head 24 . The difference is that the first single-stage cylinder 16 is a cylinder with open ends, while the second single-stage cylinder 17 is a cylinder with a closed left end and an open right end; correspondingly, the oil supply passage 15 of the first single-stage piston 18 is more The single-stage piston 19 is missing a section.

The working process of the first single-stage compression cylinder piston assembly is taken as an example to illustrate. When the first single-stage piston 18 moves to the left, the gas enters the single-stage suction valve 20 through the suction hole 12 and the suction port of the single-stage suction valve 20. In the compression chamber of the single-stage cylinder; when the first single-stage piston 18 moves to the right, the single-stage suction valve 20 blocks the suction hole 12, and the gas in the compression chamber of the single-stage cylinder is compressed until the compression of the single-stage cylinder When the pressure in the cavity exceeds the preload force of the single-stage preloading spring 22, the single-stage exhaust valve 21 is pushed open, and the gas after the single-stage compression enters the single-stage exhaust cavity 23 and is discharged out of the compressor. In this embodiment, multiple single-stage compression cylinder piston assemblies are simultaneously used to directly inhale from the back pressure chamber of the compressor to form a multi-cylinder compressor, which is beneficial to increase the exhaust volume of the compressor.

Further, as shown in FIG. 7 to FIG. 9, at least one of the plurality of cylinder piston assemblies is a gas spring cylinder piston assembly, and the gas spring compression cylinder piston assembly includes a gas spring piston 26 and a gas spring cylinder 25, and the gas spring piston 26 is provided with a gas spring piston 26. There is a suction hole 12, and the compression cavity of the gas spring cylinder 25 is a closed cavity, so that the gas enters the compression cavity of the gas spring cylinder 25 through the suction hole 12, and is compressed to form a gas spring. Specifically, this embodiment is described by taking the combination of a gas spring cylinder piston assembly and a single-stage compression cylinder piston assembly as an example, wherein the structure and principle of the single-stage compression cylinder piston assembly refer to the above embodiments, and will not be repeated here. The gas spring compression cylinder piston assembly includes a gas spring cylinder 25 with an open left end and a closed right end, a cylindrical gas spring piston 26 and a gas spring intake valve 27. The gas spring intake valve 27 can be a suction valve plate. More specifically, the axial length of the gas spring piston 26 is shorter than that of the single-stage piston. When the single-stage piston moves to the top dead center position, the end of the gas spring piston 26 is still far from the end of the gas spring cylinder 25. There is a distance, so it constitutes a gas spring, which acts as a resonance support. Among them, the top dead center position refers to the farthest point that the single-stage piston can reach when it does not collide with the exhaust valve.

In this embodiment, the compression space formed by the gas spring piston and the gas spring cylinder is used as the gas spring resonant element, which can reduce a set of exhaust devices and at the same time improve the resonant spring stiffness of the compressor.

On the basis of the above embodiment, as shown in FIGS. 1 to 9 , the stator component includes two E-shaped middle magnetic conductor stators 2 , two side magnetic conductor stators 3 and a coil winding 4 . The openings of the two intermediate magnetic conductor stators 2 are disposed opposite to each other, and the coil windings 4 are sleeved in the openings of the two intermediate magnetic conductor stators 2 . The two side magnetic conductor stators 3 are respectively arranged on both sides of the middle magnetic conductor stator 2 at intervals to form two sets of air gaps 5 . The mover component includes two sheet-shaped permanent magnets 6 respectively inserted in the air gap 5 . Among them, the middle magnetic conductor stator 2 and the side magnetic conductor stator 3 are magnetic conductor laminations. The middle magnetic conductor stator 2 and the side magnetic conductor stators 3 on both sides form a symmetrical magnetic circuit, the coil winding 4 generates a magnetic field through alternating current, and a magnetic field with alternating positive and negative directions is formed in the long air gap 5 through the symmetrical magnetic circuit. Under the action of the magnetic field, the permanent magnet 6 generates an axial reciprocating electromagnetic driving force, thereby pushing the piston in the cylinder to compress the gas.

Further, the mover component also includes a mover bracket 7 , and two sheet-shaped permanent magnets 6 are installed on both ends of one side of the mover bracket 7 in parallel with each other. One side of the mover bracket 7 is connected to the stator part through the first resonance spring 8, and the other side of the mover bracket 7 is connected to the cylinder through the second resonance spring 9. The axis of the first resonance spring 8 and the axis of the second resonance spring 9 are connected. The axes are parallel to each other and parallel to the reciprocating direction of the mover. Specifically, the mover bracket 7 can be made of a shaping material such as plastic, glass fiber or carbon fiber. The axis of the first resonance spring 8 and the second resonance spring 9 may adopt a cone spring, a column spring, a gas spring or a leaf spring.

Further, the outer edge of the mover bracket 7 is provided with a spring positioning flange for installing the first resonance spring 8, the middle of the mover bracket 7 is provided with a spring positioning recess for installing the second resonance spring 9, and the spring positioning flange Both the spring positioning recess and the spring positioning recess are provided with metal or non-metallic connectors for spring installation and positioning. In this embodiment, partial sizes of the resonance springs on both sides of the mover bracket 7 can be overlapped and installed, thereby improving the stability of resonance.

Further, an oil pump 10 is also included, and the oil pump 10 is used for pumping lubricating oil to the motion interface of the cylinder and the piston. The cylinder wall, inside the piston and inside the piston pin 11 are all provided with oil supply passages 15 which communicate with each other.

It can be seen from the above embodiments that the square linear compressor provided by the present invention includes a frame, a square linear oscillating motor and a plurality of cylinder piston assemblies, and the mover part of the square linear oscillating motor is inserted into the air gap formed by the stator part. , the mover part is driven to reciprocate by electromagnetic force; the number of cylinder-piston assemblies is at least two, each cylinder-piston assembly includes a piston and a cylinder, the end of the piston is flexibly connected to the mover part, and the front end of the piston can reciprocate. It is installed in the cylinder to transmit the reciprocating motion of the mover part to the piston to generate compressed gas, and at the same time, it is flexibly connected to the mover part through at least two pistons to realize the circumferential positioning of the square mover part. The square linear compressor is flexibly connected to the mover part through a plurality of cylinder piston assemblies, so as to realize the circumferential positioning of the square mover part, which can prevent the circumferential rotation of the mover part of the square linear motor and avoid the mover being stuck. to improve the stability of the structure.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit of the technical solutions of the embodiments of the present invention and range.

Claims (10)

1. A square linear compressor, characterized in that it comprises a frame, a square linear oscillating motor and a plurality of cylinder piston assemblies, the square linear oscillating motor comprises a stator part and a mover part, and the stator part is fixed to the the frame, one end of the mover part is inserted into the air gap formed by the stator part; The cylinder-piston assembly includes a piston and a cylinder, the cylinder is fixedly connected to the machine base, the end of the piston is flexibly connected to the other end of the mover component; the front end of the piston is reciprocatingly installed on the In the cylinder, the front end wall of the piston and the cylinder are surrounded by a compression chamber, and the front end wall of the piston is provided with a suction valve; at least one of the pistons is provided with a suction hole, and at least one of the cylinders is The compression chamber is provided with an exhaust valve, so that the gas enters the compression chamber through the suction hole, and is compressed and discharged from the cylinder through the exhaust valve. 2 . The square linear compressor according to claim 1 , wherein n cylinder-piston assemblies in the plurality of cylinder-piston assemblies are sequentially connected to form an n-stage compression mechanism, and n is an integer greater than or equal to 2; 3 . The front end of the nth stage piston of the nth stage cylinder piston assembly divides the interior of the nth stage cylinder into the nth stage suction chamber and the nth stage compression chamber, and the front end of the nth stage piston is provided with a through hole to connecting the n-th stage suction chamber and the n-th stage compression chamber; the n-th stage compression chamber discharges the compressed gas through the n-th stage exhaust valve; When n is greater than 2, the front end of the n-1st stage piston of the n-1st stage cylinder piston assembly divides the interior of the n-1st stage cylinder into the n-1st stage suction chamber and the n-1st stage compression chamber , and the front end of the n-1st stage piston is provided with a through hole to communicate with the n-1st stage suction chamber and the n-1st stage compression chamber; the n-1st stage compression chamber passes through the The n-1 stage exhaust valve is connected to the closed n-1 stage exhaust cavity; the n-1 stage exhaust cavity is connected to the nth stage suction cavity through the nth stage suction passage; The front end wall of the first-stage piston of the first-stage cylinder-piston assembly and the first-stage cylinder are surrounded by a first-stage compression chamber, and the first-stage piston is provided with the suction hole, so that the gas can enter through the suction hole. the first-stage compression chamber; the first-stage compression chamber is communicated to the closed first-stage exhaust chamber through the first-stage exhaust valve; the first-stage exhaust chamber is communicated to the closed first-stage exhaust chamber through the second-stage suction passage Second stage suction chamber. 3. The square linear compressor according to claim 1, wherein at least one of the plurality of cylinder piston assemblies is a single-stage compression cylinder piston assembly, and the single-stage compression cylinder piston assembly comprises a single-stage piston and a A single-stage cylinder, the single-stage piston is provided with the suction hole, and the compression chamber of the single-stage cylinder is provided with a single-stage exhaust valve, so that the gas enters the compression of the single-stage cylinder through the suction hole The cavity is compressed and discharged from the single-stage cylinder through the single-stage exhaust valve. 4. The square linear compressor according to claim 3, wherein at least one of the plurality of cylinder piston assemblies is a gas spring cylinder piston assembly, and the gas spring cylinder piston assembly comprises a gas spring piston and a gas spring cylinder , the gas spring piston is provided with the suction hole, and the compression cavity of the gas spring cylinder is a closed cavity, so that the gas enters the compression cavity of the gas spring cylinder through the suction hole, and after being compressed Form a gas spring. 5. The square linear compressor according to claim 1, wherein the stator part comprises two E-shaped intermediate magnetic conductor stators, two side magnetic conductor stators and one coil winding; two of the intermediate magnetic conductor stators; The openings of the conductor stators are arranged opposite to each other, and the coil windings are sleeved in the openings of the two middle magnetic conductor stators; forming two sets of said air gaps; The mover component includes two sheet-shaped permanent magnets respectively inserted in the air gap. 6 . The square linear compressor according to claim 5 , wherein the mover component further comprises a mover bracket, and the two sheet-shaped permanent magnets are installed on one side of the mover bracket in parallel with each other. 7 . Both ends of the mover bracket; one side of the mover bracket is connected to the stator part through a first resonance spring, the other side of the mover bracket is connected to the cylinder through a second resonance spring, the first resonance spring and the axis of the second resonant spring are parallel to each other. 7 . The square linear compressor according to claim 6 , wherein the outer edge of the mover bracket is provided with a spring positioning flange for installing the first resonance spring, and the middle part of the mover bracket is provided with a spring positioning flange. There are spring positioning recesses for mounting the second resonant spring. 8 . The square linear compressor according to claim 1 , wherein the suction valve is a suction valve plate with one end fixed to the front end wall of the piston; one end of the discharge valve is pressed against the The exhaust port of the compression chamber, and the other end of the exhaust valve is connected to the cylinder through a preload spring. 9 . The square linear compressor according to claim 1 , further comprising an oil pump for pumping lubricating oil to the motion interface of the cylinder and the piston. 10 . 10. The square linear compressor according to any one of claims 1 to 9, wherein the flexible connection between the piston and the mover component comprises a piston pin connection, a ball joint connection or an elastic thread Screw connection.

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