CN218062575U

CN218062575U - Linear compressor

Info

Publication number: CN218062575U
Application number: CN202222076526.0U
Authority: CN
Inventors: 胡剑英; 陈志栩; 罗二仓; 张丽敏; 孙岩雷; 吴张华; 陈燕燕
Original assignee: Technical Institute of Physics and Chemistry of CAS
Current assignee: Technical Institute of Physics and Chemistry of CAS
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-12-16
Anticipated expiration: 2032-08-08

Abstract

The utility model provides a linear compressor relates to compressor technical field. The linear compressor comprises a shell, a first cylinder, a first piston, a second cylinder, a second piston, a connecting piece, a stator, a rotor and a back cavity, wherein the first cylinder, the first piston, the second cylinder, the second piston, the connecting piece, the stator, the rotor and the back cavity are arranged in the shell; the first cylinder comprises a first compression cavity, the first piston is movably arranged in the first compression cavity, the second cylinder comprises a second compression cavity, the second piston is movably arranged in the second compression cavity, the first cylinder and the second cylinder are coaxially arranged, and the first piston and the second piston are coaxially arranged and are connected through the connecting piece to realize synchronous motion; the stator and the rotor are arranged on one side relatively close to the first cylinder, and the rotor is fixed on the connecting piece and moves synchronously with the first piston. The utility model provides a linear compressor is favorable to eliminating the piston drift, optimizes linear compressor's output performance.

Description

Linear compressor

Technical Field

The utility model relates to a compressor technical field especially relates to a linear compressor.

Background

A linear compressor is a compressor widely used in an alternating flow refrigerator or generator system, and is capable of compressing a low-pressure gas into a high-pressure gas.

The linear compressor generally includes a stator, a mover, a cylinder, and a plate spring, wherein the mover includes a piston, and the mover is driven by an alternating current to linearly reciprocate to generate a pressure wave in a compression chamber of the cylinder, thereby converting an electric energy into a mechanical energy.

In the working process of the linear compressor, because the average pressure of the compression cavity is higher than that of the back cavity, the piston can deviate from the initial balance position under the action of the pressure difference between the back cavity and the compression cavity, and the piston drifting phenomenon occurs. Drift causes the effective stroke of the piston to be reduced, and the piston is seriously deviated from the design working condition, so that the performance of the linear compressor is deteriorated. How to effectively inhibit the drift of the piston is a precondition for realizing the efficient operation of the linear compressor.

In the linear compressor in the prior art, a plate spring is generally connected with a rotor, and the piston is prevented from drifting by the elastic restoring force of the plate spring, but the plate spring is generally low in rigidity and easy to deform, so that the drifting degree of the piston is difficult to reduce to an ideal range.

SUMMERY OF THE UTILITY MODEL

The utility model provides a linear compressor for linear compressor's piston produces the technical problem of drift easily among the solution prior art.

The utility model provides a linear compressor, which comprises a shell, a first cylinder, a first piston, a second cylinder, a second piston, a connecting piece, a stator, a rotor and a back cavity, wherein the first cylinder, the first piston, the second cylinder, the second piston, the connecting piece, the stator, the rotor and the back cavity are arranged in the shell;

the first cylinder comprises a first compression cavity, the first piston is movably arranged in the first compression cavity, the second cylinder comprises a second compression cavity, the second piston is movably arranged in the second compression cavity, the first cylinder and the second cylinder are coaxially arranged, and the first piston and the second piston are coaxially arranged and are connected through the connecting piece to realize synchronous movement;

the stator and the rotor are arranged on one side relatively close to the first cylinder, and the rotor is fixed on the connecting piece and moves synchronously with the first piston.

According to the utility model provides a pair of linear compressor, the casing is provided with inlet channel, inlet channel with the back of the body chamber is linked together.

According to the linear compressor provided by the utility model, a first exhaust cavity and a second exhaust cavity are arranged in the shell, the first exhaust cavity is provided with a first exhaust channel, and the second exhaust cavity is provided with a second exhaust channel;

the first exhaust cavity is communicated with the first compression cavity, and the second exhaust cavity is communicated with the second compression cavity.

According to the linear compressor provided by the utility model, the first cylinder is provided with the first check valve communicated with the first exhaust cavity, and the conduction direction of the first check valve is from the first compression cavity to the first exhaust cavity;

the second cylinder is provided with a second one-way valve communicated with the second exhaust cavity, and the conduction direction of the second one-way valve is from the second compression cavity to the second exhaust cavity;

the first exhaust cavity is communicated with the second exhaust cavity.

According to the utility model provides a pair of linear compressor, linear compressor still includes the heat exchanger, inlet channel first check valve with the exhaust end of second check valve all is provided with the heat exchanger.

According to the utility model provides a pair of linear compressor, first piston includes first passageway, first passageway respectively with back of the body chamber with first compression chamber is linked together, the second piston includes the second passageway, the second passageway respectively with back of the body chamber with second compression chamber is linked together.

According to the utility model provides a linear compressor, the first passageway is a plurality of, a plurality of the first passageway along the direction perpendicular to the first piston axial is distributed at intervals; and/or

The second passages are distributed at intervals along the direction perpendicular to the axial direction of the second piston.

According to the linear compressor provided by the utility model, one end of the first channel close to the first compression cavity is provided with a third one-way valve, and the conduction direction of the third one-way valve is from the first channel to the first compression cavity;

and a fourth one-way valve is arranged at one end of the second channel, which is close to the second compression cavity, and the conduction direction of the fourth one-way valve is from the second channel to the second compression cavity.

According to the utility model provides a pair of linear compressor, the connecting piece has the bending capacity in perpendicular to self axial direction.

The utility model provides a linear compressor, through setting up stator and active cell in the one side relatively close to first cylinder, the active cell is fixed in the connecting piece and with the first piston synchronous motion, make the first piston as the driving piston, the second piston is as the slave piston; because the average pressure of first compression chamber and second compression chamber all is higher than back cavity pressure, consequently under the effect of pressure differential, first piston has the trend of drifting towards back cavity, and the second piston has the trend of drifting towards back cavity equally, and first piston and the coaxial setting of second piston link to each other through the connecting piece, first piston and second piston can't take place relative motion along self axial, and the effect opposite direction of the pressure differential force of first piston and back cavity and the pressure differential force of second piston and back cavity, two pressure differential forces offset each other, and then make first piston and second piston all not drift, linear compressor's piston drift has been eliminated, linear compressor's output performance has been optimized.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for the embodiments or the prior art descriptions, and obviously, the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a linear compressor provided by the present invention.

Reference numerals are as follows:

1: a housing; 110: an air intake passage; 2: a first cylinder; 21: a first compression chamber; 22: a first check valve; 3: a first piston; 31: a first channel; 32: a third check valve; 4: a second cylinder; 41: a second compression chamber; 42: a second one-way valve; 5: a second piston; 51: a second channel; 52: a fourth check valve; 6: a connecting member; 7: a back cavity; 8: a first exhaust cavity; 81: a first exhaust passage; 9: a second exhaust chamber; 91: a second exhaust passage; 10: a stator; 101: a magnetic conductive member; 102: a coil; 11: a mover; 12: a heat exchanger.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "left", "right", "inner", "outer", "axial", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

As shown in fig. 1, the embodiment of the present invention provides a linear compressor, which includes a casing 1, and a first cylinder 2, a first piston 3, a second cylinder 4, a second piston 5, a connecting member 6, a stator 10, a mover 11, and a back cavity 7, which are disposed in the casing 1.

The first cylinder 2 comprises a first compression cavity 21, the first piston 3 is movably arranged in the first compression cavity 21, the second cylinder 4 comprises a second compression cavity 41, the second piston 5 is movably arranged in the second compression cavity 41, the first cylinder 2 and the second cylinder 4 are coaxially arranged, and the first piston 3 and the second piston 5 are coaxially arranged and are connected through a connecting piece 6 so as to realize synchronous motion.

The stator 10 and the mover 11 are disposed at a side relatively close to the first cylinder 2, and the mover 11 is fixed to the connecting member 6 and moves in synchronization with the first piston 3.

In a specific embodiment, the stator 10 includes a magnetic conductive member 101 and a coil 102, the magnetic conductive member 101 is a magnetic conductive silicon steel sheet, and the mover 11 includes a permanent magnet and a bracket connecting the first piston 3 and the permanent magnet. The current conductor is acted by ampere force in the magnetic field, if the current is alternating, the force generated on the current conductor is also alternating, so that the mover 11 drives the first piston 3 to make linear reciprocating motion under the action of the alternating ampere force.

As shown in fig. 1, the first cylinder 2 and the first piston 3 are located on the driving side, and the second cylinder 4 and the second piston 5 are located on the driven side. The connecting piece 6 is in a rod shape or a column shape, one end of the connecting piece is connected with the first piston 3, and the other end of the connecting piece is connected with the second piston 5, so that the first piston 3 and the second piston 5 are rigidly connected along the axial direction, and the two pistons can move synchronously. Under the action of the alternating current, the rotor 11 drives the first piston 3 to make linear reciprocating motion along the axial direction thereof, and further drives the second piston 5 to make linear reciprocating motion synchronously.

A small gap is formed between the first piston 3 and the inner wall of the first cylinder 2, the first piston 3 is suspended in the first cylinder 2 through the plate spring supporting or air floating supporting principle, mechanical friction is not generated between the first piston 3 and the inner wall of the first cylinder 2, abrasion is reduced, the service lives of the first piston 3 and the first cylinder 2 are prolonged, the working efficiency of the linear compressor is improved, meanwhile, lubricating oil is not needed between the first piston 3 and the inner wall of the first cylinder 2, the operation cost is reduced, and the linear compressor can be used in more occasions. The connection relationship between the second piston 5 and the second cylinder 4 is the same as that between the first piston 3 and the first cylinder 2, and is not described herein again.

The first cylinder 2 and the second cylinder 4 may be the same or different in size and shape; accordingly, the first piston 3 and the second piston 5 may be the same size and shape, or may be different. For example, as shown in fig. 1, the first cylinder 2 and the second cylinder 4 have the same size and shape, and the first piston 3 and the second piston 5 have the same size and shape.

The back chamber 7 comprises the space between the first piston 3 and the second piston 5. It is apparent that the average pressure of the first compression chamber 21 and the second compression chamber 41 is higher than the back chamber 7 pressure during the operation of the linear compressor. The differential pressure of the first compression chamber 21 and the back chamber 7 acts on the first piston 3, so that the first piston 3 has a tendency to drift towards the back chamber 7; similarly, the pressure difference between the second compression chamber 41 and the back chamber 7 acts on the second piston 5, so that the second piston 5 has a tendency to drift toward the back chamber 7. Because the first piston 3 and the second piston 5 are connected through the connecting piece 6 and move synchronously, axial relative movement cannot occur, the directions of the differential pressure of the first compression cavity 21 and the back cavity 7 and the differential pressure of the second compression cavity 41 and the back cavity 7 are opposite, the two differential pressure are mutually offset, and finally, the first piston 3 and the second piston 5 cannot drift along the axial direction.

The utility model provides a linear compressor, through setting up stator 10 and active cell 11 in the one side of being relatively close to first cylinder 2, active cell 11 is fixed in connecting piece 6 and with first piston 3 synchronous motion, make first piston 3 as the driving piston, second piston 5 as the slave piston; because the average pressure of the first compression cavity 21 and the second compression cavity 41 is higher than the pressure of the back cavity 7, under the action of the pressure difference, the first piston 3 has the tendency of drifting towards the back cavity 7, the second piston 5 also has the tendency of drifting towards the back cavity 7, the first piston 3 and the second piston 5 are coaxially arranged and are connected through the connecting piece 6, the first piston 3 and the second piston 5 cannot move relatively along the self axial direction, the pressure difference force of the first piston 3 and the back cavity 7 is opposite to the action direction of the pressure difference force of the second piston 5 and the back cavity 7, the two pressure difference forces are mutually offset, further, the first piston 3 and the second piston 5 do not drift, the piston drifting of the linear compressor is eliminated, and the output performance of the linear compressor is optimized.

Further, the housing 1 is provided with an intake passage 110, and the intake passage 110 communicates with the back chamber 7.

The air inlet channel 110 is communicated with an air source, and a low-pressure air source enters the back cavity 7 through the air inlet channel 110 and is compressed to be discharged as high-pressure air.

Specifically, a first exhaust chamber 8 and a second exhaust chamber 9 are provided in the housing 1, the first exhaust chamber 8 is provided with a first exhaust passage 81, and the second exhaust chamber 9 is provided with a second exhaust passage 91.

The first discharge chamber 8 is adapted to communicate with the first compression chamber 21, and the second discharge chamber 9 is adapted to communicate with the second compression chamber 41.

The low-pressure gas source enters the back chamber 7 through the inlet passage 110, is compressed by the first compression chamber 21 and the second compression chamber 41 to become high-pressure gas, and is discharged from the first exhaust passage 81 or the second exhaust passage 91.

As shown in fig. 1, a first exhaust chamber 8 and a second exhaust chamber 9 are respectively located on the left and right sides of the housing 1, the first exhaust chamber 8 is located on the driving side, and the second exhaust chamber 9 is located on the driven side. The first cylinder 2 and the second cylinder 4 each have a back plate, the back plate of the first cylinder 2 separating the first exhaust chamber 8 from the back chamber 7, and the back plate of the second cylinder 4 separating the second exhaust chamber 9 from the back chamber 7.

In a specific embodiment, the first cylinder 2 is provided with a first check valve 22 communicating with the first discharge chamber 8, and the first check valve 22 is communicated in a direction from the first compression chamber 21 to the first discharge chamber 8. The second cylinder 4 is provided with a second check valve 42 communicated with the second discharge chamber 9, and the second check valve 42 is communicated in a direction from the second compression chamber 41 to the second discharge chamber 9. The first exhaust chamber 8 is communicated with the second exhaust chamber 9.

When the pressure of the first compression chamber 21 is greater than the pressure of the first discharge chamber 8, the first check valve 22 is turned on, and gas flows from the first compression chamber 21 into the first discharge chamber 8 and is discharged from the first discharge passage 81. When the pressure of the second compression chamber 41 is higher than the pressure of the second discharge chamber 9, the second check valve 42 is opened, and the gas flows from the second compression chamber 41 into the second discharge chamber 9 and is discharged from the second discharge passage 91. In this embodiment, the linear compressor can compress a low pressure gas into a high pressure gas and discharge it by the reciprocating motion of the first and second pistons 3 and 5 and the orderly opening and closing of the first and

second check valves

22 and 42.

Specifically, the first exhaust chamber 8 and the second exhaust chamber 9 are communicated with each other through a pipe or the like to ensure that the gas pressure inside the first exhaust chamber 8 and the second exhaust chamber 9 is the same, which is favorable for improving the consistency of the pressure of the high-pressure gas discharged from the first exhaust passage 81 and the second exhaust passage 91.

Further, the linear compressor further includes a heat exchanger 12, and the air inlet passage 110, the first check valve 22 and the exhaust end of the second check valve 42 are provided with the heat exchanger 12.

As shown in fig. 1, a heat exchanger 12 is disposed in the back cavity 7 near the inlet channel 110, and the heat exchanger 12 is used for cooling the low-pressure gas, so that the temperature of the low-pressure gas entering the back cavity 7 is reduced, which is beneficial to improving the compression effect of the linear compressor.

The heat exchanger 12 is arranged at the position of the first check valve 22 on the back plate of the first cylinder 2, the heat exchanger 12 is also arranged at the position of the second check valve 42 on the back plate of the second cylinder 4, and the heat exchangers 12 at the two positions are used for reducing the gas temperature, so that the high-pressure gas after being compressed is prevented from being too high in temperature and influencing subsequent devices.

The first piston 3 includes a first passage 31, the first passage 31 communicating with the back chamber 7 and the first compression chamber 21, respectively, and the second piston 5 includes a second passage 51, the second passage 51 communicating with the back chamber 7 and the second compression chamber 41, respectively.

As shown in fig. 1, the extending direction of the first channel 31 is parallel to the axial direction of the first piston 3, the extending direction of the second channel 51 is parallel to the axial direction of the second piston 5, and the gas in the back cavity 7 can enter the first compression cavity 21 through the first channel 31, enter the second compression cavity 41 through the second channel 51, and then enter the first exhaust cavity 8 or the second exhaust cavity 9 after being compressed by the first piston 3 or the second piston 5, and is exhausted as high-pressure gas.

The first passage 31 and the second passage 51 may be one or more, for example, the first passage 31 may be plural, and the plural first passages 31 are spaced apart in a direction perpendicular to the axial direction of the first piston 3; and/or the second passage 51 is multiple, and the multiple second passages 51 are distributed at intervals along the direction perpendicular to the axial direction of the second piston 5.

As shown in fig. 1, the number of the first passages 31 and the number of the second passages 51 are two, the two first passages 31 are spaced apart in a direction perpendicular to the axial direction of the first piston 3, and the two second passages 51 are spaced apart in a direction perpendicular to the axial direction of the second piston 5, which helps to increase the gas flow rate and improve the gas compression efficiency.

Further, an end of the first passage 31 near the first compression chamber 21 is provided with a third check valve 32, and the third check valve 32 is communicated from the first passage 31 to the first compression chamber 21. One end of the second passage 51 near the second compression chamber 41 is provided with a fourth check valve 52, and the fourth check valve 52 is communicated in a direction from the second passage 51 to the second compression chamber 41.

It is understood that, in the case that there are a plurality of the first passages 31 or the second passages 51, a plurality of the third check valves 32 or the fourth check valves 52 are correspondingly provided, that is, the third check valve 32 is provided at an end of each of the first passages 31 adjacent to the first compression chamber 21, and the fourth check valve 52 is provided at an end of each of the second passages 51 adjacent to the second compression chamber 41.

When the pressure in the back chamber 7 is higher than the pressure in the first compression chamber 21, the gas in the back chamber 7 enters the first compression chamber 21 through the first passage 31 and the third check valve 32; when the pressure in the back chamber 7 is greater than the pressure in the second compression chamber 41, the gas in the back chamber 7 enters the second compression chamber 41 through the second passage 51 and the fourth check valve 52.

In a specific embodiment, the linear compressor operates on the following principle: low-pressure gas enters the shell 1 through the gas inlet channel 110, and the gas enters the back cavity 7 after being cooled by the heat exchanger 12; when the first piston 3 is driven by the mover 11 to move in a direction close to the back cavity 7, the volume of the first compression cavity 21 is gradually increased, the pressure of gas in the first compression cavity 21 is gradually reduced, and when the pressure of gas in the first compression cavity 21 is lower than the pressure of gas in the back cavity 7, the third check valve 32 is communicated, and the gas in the back cavity 7 enters the first compression cavity 21 through the first channel 31; when the first piston 3 moves in a direction away from the back chamber 7, the volume of the first compression chamber 21 is gradually reduced, the gas in the first compression chamber 21 is compressed, the gas pressure is gradually increased, when the gas pressure in the first compression chamber 21 is higher than the gas pressure in the first exhaust chamber 8, the first check valve 22 is opened, the high-pressure gas in the first compression chamber 21 enters the first exhaust chamber 8, and is discharged from the first exhaust passage 81 after being cooled by the heat exchanger 12. The principle of the gas exhaust from the second exhaust chamber 9 is similar to the above process and will not be described in detail.

In an alternative embodiment, the connecting element 6 has a bending capacity in a direction perpendicular to its own axis.

Illustratively, the connecting member 6 is made of a spring steel material, which not only has bending capability in a direction perpendicular to the axial direction of the connecting member, but also ensures the connecting strength of the first piston 3 and the second piston 5.

The diameter of the connecting piece 6 is much smaller than the diameter of the first piston 3 or the second piston 5, for example the diameter of the connecting piece 6 is 1/10 of the diameter of the first piston 3 or the second piston 5. The connecting member 6 has a certain bending capability in its own radial direction, and its maximum bending deformation amount in the radial direction is of the order of 0.1mm, but in the axial direction of the connecting member 6, the axial deformation amount of the connecting member 6 is so small as to be negligible with respect to the moving strokes of the first piston 3 and the second piston 5, and it can be considered approximately that the connecting member 6 cannot be elongated or shortened.

Under ideal conditions, if the first cylinder 2 and the second cylinder 4 are completely coaxial, the first piston 3 and the second piston 5 can be completely and rigidly connected, and the first piston 3 and the second piston 5 can reach higher coaxial degree through external grinding and other processing modes, so that friction-free smooth movement of the pistons in the cylinders can be realized. However, in practical situations, due to the influence of factors such as flatness and parallelism of the mounting surface of the cylinder, and deformation of the housing caused by a force, it is difficult to achieve ideal coaxiality of the first cylinder 2 and the second cylinder 4, and especially in the case that the housing 1 is deformed by a gas pressure, the amount of change in coaxiality of the two cylinders is relatively large and easily reaches the order of 100 micrometers, which easily causes severe friction and even seizure between the cylinders and the piston, thereby affecting the normal use of the linear compressor.

And the connecting piece 6 in this embodiment has certain elasticity, and has bending capability in the direction perpendicular to the self axial direction, even if the coaxiality of the first cylinder 2 and the second cylinder 4 is not ideal, because the connecting piece 6 has deformation capability in the self radial direction, the first piston 3 and the second piston 5 can generate relative motion in the self radial direction, so as to automatically adapt to the central shaft deviation between the two cylinders, and realize frictionless smooth motion of the pistons in the cylinders.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A linear compressor is characterized by comprising a shell, a first cylinder, a first piston, a second cylinder, a second piston, a connecting piece, a stator, a rotor and a back cavity, wherein the first cylinder, the first piston, the second cylinder, the second piston, the connecting piece, the stator, the rotor and the back cavity are arranged in the shell;

the first cylinder comprises a first compression cavity, the first piston is movably arranged in the first compression cavity, the second cylinder comprises a second compression cavity, the second piston is movably arranged in the second compression cavity, the first cylinder and the second cylinder are coaxially arranged, and the first piston and the second piston are coaxially arranged and are connected through the connecting piece to realize synchronous motion;

2. The linear compressor of claim 1, wherein the housing is provided with an intake passage communicating with the back chamber.

3. The linear compressor of claim 2, wherein a first exhaust cavity and a second exhaust cavity are arranged in the shell, the first exhaust cavity is provided with a first exhaust channel, and the second exhaust cavity is provided with a second exhaust channel;

4. The linear compressor of claim 3, wherein the first cylinder is provided with a first check valve communicated with the first discharge chamber, and a communication direction of the first check valve is from the first compression chamber to the first discharge chamber;

the first exhaust cavity is communicated with the second exhaust cavity.

5. The linear compressor of claim 4, further comprising a heat exchanger, wherein the air intake passage, the first check valve, and the exhaust end of the second check valve are each provided with the heat exchanger.

6. The linear compressor of claim 1, wherein the first piston includes a first passage in communication with the back chamber and the first compression chamber, respectively, and the second piston includes a second passage in communication with the back chamber and the second compression chamber, respectively.

7. The linear compressor of claim 6, wherein the first passage is a plurality of first passages spaced apart in a direction perpendicular to an axial direction of the first piston; and/or

8. The linear compressor of claim 6, wherein a third check valve is disposed at an end of the first passage close to the first compression chamber, and a communication direction of the third check valve is from the first passage to the first compression chamber;

9. The linear compressor of claim 1, wherein the connecting member has a bending capability in a direction perpendicular to an axial direction thereof.