Piston compressors, refrigerators

Abstract

The present invention provides a piston compressor and a refrigerator, wherein the piston compressor comprises a housing and a core assembly, the bottom of the core assembly is connected to the housing through a shock-absorbing component, the core assembly comprises a cylinder seat, and also comprises a first exhaust pipe and a second exhaust pipe, the first exhaust pipe has a first shell section, the second exhaust pipe has a second shell section, the two ends of the first shell section are respectively connected to the cylinder seat and the housing, the two ends of the second shell section are respectively connected to the cylinder seat and the housing, the cylinder seat is a symmetrical structure symmetrical about a first symmetry plane, and the first shell section and the second shell section are respectively located on both sides of the first symmetry plane. According to the present invention, the rigidity of the exhaust pipe can be used to form a certain support limit on both sides of the core assembly, thereby effectively reducing the probability of vibration of the core assembly during operation and collision with the housing, reducing the noise caused by vibration, and making the operation of the core assembly more stable.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigerator design, and in particular relates to a piston compressor and a refrigerator. Background Art

[0002] With the rapid development of my country's economy, household refrigerators have become a must-have for every family. At the same time, with the continuous improvement of people's living standards, various requirements are put forward for refrigerators, such as high cooling capacity, low noise and small vibration.

[0003] The exhaust system in the piston compressor is related to the exhaust efficiency and exhaust noise of the compressor. It is one of the key components of the compressor. The improvement and optimization of its structure is the focus of research by various ice compressor companies. In order to improve the exhaust efficiency and reduce the exhaust noise, the current compressors are mostly optimized from the structure of the valve group. In fact, in order to reduce the vibration of the compressor movement (usually including the pump body assembly, cylinder head assembly, etc.) during movement, the bottom of the movement is freely supported in the form of a spring in the prior art. At the same time, this shock-absorbing structure causes the movement to vibrate at all angles of 360° during the operation of the compressor. Conventional compressors are mostly limited by a single-sided exhaust pipe, which will cause traction on the exhaust pipe connected to the movement, causing the movement to deviate to the side of the exhaust pipe set on the single side. During the operation of the compressor, the movement is unstable, with large vibrations, loud noises, and abnormal problems such as the compressor hitting the shell. Summary of the invention

[0004] Therefore, the present invention provides a piston compressor and a refrigerator to overcome the shortcomings of the related art that the compressor exhaust pipe is arranged on one side of the core component, resulting in large vibration and noise of the core component and easy collision with the shell during operation.

[0005] In order to solve the above problems, the present invention provides a piston compressor, including an outer shell and a movement assembly, the bottom of the movement assembly is connected to the outer shell through a shock-absorbing component, the movement assembly includes a cylinder seat, and also includes a first exhaust pipe and a second exhaust pipe, the first exhaust pipe has a first shell section, the second exhaust pipe has a second shell section, the two ends of the second shell section are respectively connected to the cylinder seat and the outer shell, the two ends of the first shell section are respectively connected to the cylinder seat and the outer shell, the cylinder seat is a symmetrical structure symmetrical about a first symmetry plane, and the first shell section and the second shell section are respectively located on both sides of the first symmetry plane.

[0006] In some embodiments, the first inner shell section is symmetrical to the second inner shell section about the first symmetry plane.

[0007] In some embodiments, a first exhaust silencer chamber and a second exhaust silencer chamber are constructed on the cylinder seat, and two ends of the first shell inner section are respectively connected to the first exhaust silencer chamber and the outer shell, and two ends of the second shell inner section are respectively connected to the second exhaust silencer chamber and the outer shell.

[0008] In some embodiments, the first in-shell section includes a first connecting section connected to the first exhaust muffler chamber, a second connecting section connected to the outer shell, and a U-bend structure between the first connecting section and the second connecting section.

[0009] In some embodiments, the U-bend structure includes a first U-bend and a second U-bend.

[0010] In some embodiments, the first U-bend includes a first tube connected to the first connecting section, a second tube parallel to the first tube, and a third tube connected between the first tube and the second tube, the second U-bend and the first U-bend share the second tube, and the second U-bend also includes a fourth tube between the second connecting section and the second tube.

[0011] In some embodiments, the plane where the first U-bend is located is not in the same plane as the plane where the second U-bend is located; and / or, the opening direction of the first U-bend is opposite to the opening direction of the second U-bend.

[0012] In some embodiments, in the plane formed by the first connecting section and the first tube, the angle between the two tubes is a, 100°≤a≤120°; and / or, in the plane formed by the first tube and the third tube, the angle between the two tubes is b, 60°≤b≤90°; and / or, in the plane formed by the second tube and the third tube, the angle between the two tubes is c, 60°≤c≤90°; and / or, in the plane formed by the second tube and the fourth tube, the angle between the two tubes is d, 60°≤d≤90°; and / or, in the plane formed by the second connecting section and the fourth tube, the angle between the two tubes is e, 60°≤e≤90°.

[0013] In some embodiments, b=c; and / or, d=e.

[0014] In some embodiments, the movement assembly also includes a cylinder head assembly, the cylinder head assembly includes an air valve assembly, the air valve assembly has a first exhaust channel and a second exhaust channel, the first exhaust channel and the second exhaust channel are connected to the first exhaust muffler chamber and the second exhaust muffler chamber.

[0015] In some embodiments, the air valve assembly includes a valve plate and an exhaust valve sheet, and the movement assembly also includes a pump body assembly. The exhaust valve sheet is located on the side of the valve plate away from the pump body assembly, and the valve plate is configured with a first exhaust hole corresponding to the first exhaust channel and a second exhaust hole corresponding to the second exhaust channel. The exhaust valve sheet is provided with a first exhaust valve tongue corresponding to the first exhaust hole and a second exhaust valve tongue corresponding to the second exhaust hole.

[0016] In some embodiments, the air valve assembly also includes an intake valve plate, which has an intake valve tongue, and the intake valve tongue is configured with a third exhaust through hole corresponding to the first exhaust through hole and a fourth exhaust through hole corresponding to the second exhaust through hole, the first exhaust through hole and the third exhaust through hole constitute the first exhaust channel, and the second exhaust through hole and the fourth exhaust through hole constitute the second exhaust channel.

[0017] In some embodiments, a hole on one side of the first exhaust through hole facing the exhaust valve plate is expanded; and / or a hole on one side of the second exhaust through hole facing the exhaust valve plate is expanded.

[0018] In some embodiments, the generatrix of the flared opening is an arc line.

[0019] In some embodiments, a first air intake hole corresponding to the sealing tongue of the air intake valve tongue is constructed on the valve plate, and a second air intake hole corresponding to the first air intake hole is constructed on the exhaust valve plate; and / or, a first air inlet hole and a second air inlet hole are also constructed on the valve plate, and a third air inlet hole corresponding to the first air inlet hole and a fourth air inlet hole corresponding to the second air inlet hole are also constructed on the air intake valve plate, and the airflow discharged from the first exhaust channel and the second exhaust channel can enter the first exhaust silencer chamber via the first air inlet hole and the third air inlet hole in sequence, and / or, the airflow discharged from the first exhaust channel and the second exhaust channel can enter the second exhaust silencer chamber via the second air inlet hole and the fourth air inlet hole in sequence.

[0020] The present invention also provides a refrigerator, comprising a piston compressor, wherein the piston compressor is the above-mentioned piston compressor.

[0021] The present invention provides a piston compressor and a refrigerator, wherein the first shell inner section and the second shell inner section are respectively located on both sides of the first symmetry plane, that is, on different sides of the core assembly, so that the rigidity of the exhaust pipe can be used to form a certain support limit for both sides of the core assembly, thereby effectively reducing the probability of vibration of the core assembly during operation and the collision with the outer shell, reducing the noise caused by the vibration, and making the operation of the core assembly more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the internal structure of a piston compressor according to an embodiment of the present invention (the compressor cover is omitted, and the compressor is viewed from a top view in a vertically installed state);

[0023] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure of the first inner shell section (or the second inner shell section);

[0024] Figure 3 for Figure 1 A schematic diagram of the disassembly structure of the gas valve assembly in the cylinder head assembly;

[0025] Figure 4 for Figure 3 A schematic diagram of the structure of the valve plate;

[0026] Figure 5 for Figure 4 A cross-sectional view of a first exhaust through hole and a second exhaust through hole of a valve plate;

[0027] Figure 6 for Figure 3 A schematic diagram of the structure of the exhaust valve plate;

[0028] Figure 7 for Figure 3 A schematic diagram of the structure of the suction valve sheet;

[0029] Figure 8 Schematic diagram of a refrigeration system of a refrigerator according to an embodiment of the present invention.

[0030] The reference numerals are:

[0031] 1. Shell; 21. Cylinder seat; 31. First exhaust silencer chamber; 32. Second exhaust silencer chamber; 41. First shell inner section; 411. First connecting section; 412. Second connecting section; 42. Second shell inner section; 43. First U-bend; 431. First pipe; 432. Second pipe; 433. Third pipe; 434. Fourth pipe; 44. Second U-bend; 45. First exhaust pipe; 46. Second exhaust pipe; 5. Cylinder head assembly; 51. Intake valve plate; 511. Intake valve tongue; 512. Third exhaust through hole; 51 3. Fourth exhaust through hole; 514. Third air inlet through hole; 515. Fourth air inlet through hole; 52. Valve plate; 521. First exhaust through hole; 522. Second exhaust through hole; 523. First air intake through hole; 524. First air inlet through hole; 525. Second air inlet through hole; 53. Exhaust valve plate; 531. First exhaust valve tongue; 532. Second exhaust valve tongue; 533. Second air intake through hole; 6. Pump body assembly; 100. Piston compressor; 101. Evaporator; 102. Throttling element; 103. Condenser. DETAILED DESCRIPTION

[0032] See also Figures 1 to 8 As shown, according to an embodiment of the present invention, there is provided a piston compressor, comprising a housing 1 and a core assembly, wherein the bottom of the core assembly is connected to the housing 1 through a shock absorbing component (e.g., a shock absorbing seat), the core assembly comprises a cylinder seat 21, and further comprises a first exhaust pipe 45 and a second exhaust pipe 46, the first exhaust pipe 45 having a first in-shell section 41, the second exhaust pipe 46 having a second in-shell section 42, the two ends of the first in-shell section 41 being respectively connected to the cylinder seat 21 and the housing 1, the two ends of the second in-shell section 42 being respectively connected to the cylinder seat 21 and the housing 1, the cylinder seat 21 being a symmetrical structure symmetrical about a first symmetry plane, the first in-shell section 41 and the second in-shell section 42 being respectively located on both sides of the first symmetry plane, it can be understood that when the piston compressor is installed vertically (e.g., Figure 1 The cylinder seat 21 is bilaterally symmetrical about the first symmetry plane. In some cases, the structure of the housing 1 is preferably symmetrical about the first symmetry plane. In this technical solution, the first housing inner section 41 and the second housing inner section 42 are respectively located on both sides of the first symmetry plane, that is, on different sides of the core assembly, so that the rigidity of the exhaust pipe can be used to form a certain support limit on both sides of the core assembly, thereby effectively reducing the probability of vibration of the core assembly during operation and collision with the housing 1, reducing the noise caused by vibration, and making the operation of the core assembly more stable. The first housing inner section 41 and the second housing inner section 42 can be an organic part of the first exhaust pipe 45 and the second exhaust pipe 46, respectively, or can be a separate pipe section assembled and connected (for example, welded) with the first exhaust pipe 45 and the second exhaust pipe 46, respectively, and the present invention does not make special restrictions, and the first exhaust pipe 45, the second exhaust pipe 46 and the first housing inner section 41 and the second housing inner section 42 are, for example, copper pipes.

[0033] In some embodiments, the first inner shell section 41 and the second inner shell section 42 are symmetrical about the first symmetry plane, so that the first inner shell section 41 and the second inner shell section 42 have a centering effect on the support of the movement assembly, and the vibration reduction and noise reduction effect is better.

[0034] In some embodiments, the cylinder seat 21 is configured with a first exhaust silencer chamber 31 and a second exhaust silencer chamber 32, the first exhaust silencer chamber 31 and the second exhaust silencer chamber 32 are symmetrical about the first symmetry plane, the two ends of the first shell inner section 41 are respectively connected to the first exhaust silencer chamber 31 and the shell 1, and the two ends of the second shell inner section 42 are respectively connected to the second exhaust silencer chamber 32 and the shell 1. Generally speaking, the cylinder seat 21 is formed by casting, and in this case, the first exhaust silencer chamber 31 and the second exhaust silencer chamber 32 can also be integrally formed with the cylinder seat 21 by casting. The first exhaust silencer chamber 31 and the second exhaust silencer chamber 32 are respectively connected to the first shell inner section 41 and the second shell inner section 42 and are symmetrical about the first symmetry plane, so that the internal structure of the piston compressor can be optimized.

[0035] In some embodiments, the first inner shell section 41 includes a first connecting section 411 connected to the first exhaust silencer chamber 31, a second connecting section 412 connected to the outer shell 1, and a U-bend structure between the first connecting section 411 and the second connecting section 412. The design of the U-bend structure can enhance the vibration damping and buffering capability of the first inner shell section 41. Specifically, when the movement assembly is running, one end of the first inner shell section 41 connected to the movement assembly will be stretched or compressed. At this time, the tensile force or compressive force will force the two ends of the U-bend structure to move towards or away from each other. The inherent tension of the U-bend structure can resist the displacement towards or away from each other to a certain extent, thereby achieving vibration buffering of the movement assembly.

[0036] In some embodiments, the U-bend structure includes a first U-bend 43 and a second U-bend 44. Specifically, the first U-bend 43 includes a first tube 431 connected to the first connecting section 411, a second tube 432 parallel to the first tube 431, and a third tube 433 connected between the first tube 431 and the second tube 432. The second U-bend 44 and the first U-bend 43 share the second tube 432. The second U-bend 44 also includes a fourth tube 434 between the second connecting section 412 and the second tube 432. The first U-bend 43 and the second U-bend 44 are used to form the U-bend structure, which can ensure that the first shell inner section 41 has the proper rigidity while having the appropriate flexibility (buffering capacity). Excessive bending structures are set inside the first shell inner section 41, which simplifies the pipeline structure and prevents excessive bending structures from causing large losses along the compressor, reducing pressure, and ultimately causing the pressure to be too low when matching with the system, and reducing the cooling capacity of the system.

[0037] Furthermore, the plane where the first U-bend 43 is located is not in the same plane as the plane where the second U-bend 44 is located. Specifically, the two planes intersect at the second tube 432, so that the U-bend structure can adapt to the structure in the housing 1. At the same time, the first U-bend 43 and the second U-bend 44 that are not in the same plane can further improve their shock absorption effect. The reduction of vibration is also beneficial to noise to a certain extent, especially low-frequency noise. Preferably, the opening direction of the first U-bend 43 is opposite to the opening direction of the second U-bend 44. Specifically, for example, the opening direction of the first U-bend 43 is vertically upward, while the opening direction of the second U-bend 4 4 is opened in a vertical direction downward. At this time, correspondingly, the first tube 431 and the second tube 432 extend in a vertical direction (the vertical direction of the compressor), and mainly form a longitudinal vibration buffer for the movement component. The specific length is selected based on not colliding with the cylinder seat 21. The third tube 433 and the fourth tube 434 extend in a horizontal direction, and mainly form a lateral vibration buffer for the movement component. The length L2 of the third tube 433 and the length L3 of the fourth tube 434 can be reasonably selected according to the space conditions in the shell 1, as long as it can be ensured that the movement component does not collide with the shell 1 during operation.

[0038] In some embodiments, in the plane formed by the first connecting section 411 and the first tube 431, the angle between the two tubes is a, 100°≤a≤120°; and / or, in the plane formed by the first tube 431 and the third tube 433, the angle between the two tubes is b, 60°≤b≤90°; and / or, in the plane formed by the second tube 432 and the third tube 433, the angle between the two tubes is c, 60°≤c≤90°; and / or, in the plane formed by the second tube 432 and the third tube 433, the angle between the two tubes is c, 60°≤c≤90°; In the plane formed by the second connecting section 412 and the fourth tube 434, the angle between the two tubes is d, 60°≤d≤90°; and / or, in the plane formed by the second connecting section 412 and the fourth tube 434, the angle between the two tubes is e, 60°≤e≤90°. If the aforementioned angle is too large, it will reduce the buffering effect on the vibration of the movement assembly, and the expected vibration reduction effect cannot be achieved, and it is easy to cause the exhaust pipe to break, while if the angle is too small, it is easy to break and deform the pipe, affecting the compressor exhaust. Preferably, b=c; and / or, d=e, such a design is convenient for bending and installation. It can be understood that since the second shell inner section 42 and the first shell inner section 41 are symmetrical about the first symmetry plane, the two are completely consistent in structure, and no further description is given here.

[0039] In some embodiments, the core assembly also includes a cylinder head assembly 5, and the cylinder head assembly 5 includes an air valve assembly, and the air valve assembly has a first exhaust channel and a second exhaust channel, and the first exhaust channel and the second exhaust channel are connected to the first exhaust muffler chamber 31 and the second exhaust muffler chamber 32. In this technical solution, by arranging a double exhaust structure of the first exhaust channel and the second exhaust channel on the air valve assembly, the exhaust speed of the compressor can be increased, the exhaust resistance of the compressor can be reduced, and the pressure shortage and cooling capacity reduction of the system caused by the large resistance loss along the way can be prevented. The first exhaust muffler chamber 31 and the second exhaust muffler chamber 32 can increase the muffler volume of the compressor gas and reduce the exhaust noise of the whole machine. For a large-displacement compressor, if the diameter and area of ​​the exhaust orifice are too small, it will cause excessive pressure loss of the compressor, increase power consumption, and reduce COP. The two exhaust channels used in the present invention can increase the exhaust speed and reduce pressure loss.

[0040] Specifically, the air valve assembly includes a valve plate 52 and an exhaust valve plate 53, and the movement assembly also includes a pump body assembly 6 (which can be understood to include components such as a piston, a crank, and a connecting rod). The exhaust valve plate 53 is located on the side of the valve plate 52 away from the pump body assembly 6. The valve plate 52 is configured with a first exhaust through hole 521 corresponding to the first exhaust channel and a second exhaust through hole 522 corresponding to the second exhaust channel. The exhaust valve plate 53 is provided with a first exhaust valve tongue 531 corresponding to the first exhaust through hole 521 and a second exhaust valve tongue 532 corresponding to the second exhaust through hole 522. In this technical solution, the first exhaust valve tongue 531 and the second exhaust valve tongue 532 are used to control the exhaust of the first exhaust through hole 521 and the second exhaust through hole 522, respectively. Compared with the conventional structure in which a single valve tongue corresponds to multiple exhaust through holes, the stress concentration points of the two exhaust valve tongues can be separated, thereby improving the rigidity of the exhaust valve tongue and reducing the probability of fracture.

[0041] The air valve assembly also includes an intake valve plate 51, which has an intake valve tongue 511, and the intake valve tongue 511 is configured with a third exhaust through hole 512 corresponding to the first exhaust through hole 521 and a fourth exhaust through hole 513 corresponding to the second exhaust through hole 522. The first exhaust through hole 521 and the third exhaust through hole 512 constitute the first exhaust channel, and the second exhaust through hole 522 and the fourth exhaust through hole 513 constitute the second exhaust channel. It can be understood that the third exhaust through hole 512 and the fourth exhaust through hole 513 should be arranged in an area outside the sealing portion of the intake valve tongue 511, such as the waist position of the valve tongue. At the same time, the outer diameter edges of the third exhaust through hole 512 and the fourth exhaust through hole 513 should not exceed the waist area (waist width) of the valve tongue so as not to cause detrimental effects on exhaust. Similarly, since the first exhaust through hole 521 and the second exhaust through hole 522 correspond to the third exhaust through hole 512 and the fourth exhaust through hole 513 respectively, their outer diameter edges should not exceed the waist area (waist width) of the valve tongue.

[0042] The opening of the first exhaust through hole 521 on one side facing the exhaust valve plate 53 is expanded, and / or the opening of the second exhaust through hole 522 on one side facing the exhaust valve plate 53 is expanded. The expansion structure can guide the exhaust airflow on the one hand, and on the other hand, it can increase the contact area between the exhaust airflow and the exhaust valve tongue, so that the exhaust valve tongue can be opened more smoothly. Preferably, the generatrix of the expansion is an arc line, so that the exhaust hole is more matched with the flow direction of the fluid in the exhaust process, improving the exhaust flow, reducing the flow resistance, reducing the compression power of the exhaust process, and helping to improve performance.

[0043] In some embodiments, the valve plate 52 is constructed with a first intake hole 523 corresponding to the sealing tongue of the intake valve tongue 511, and the exhaust valve plate 53 is constructed with a second intake hole 533 corresponding to the first intake hole 523. The valve plate 52 is a flat valve plate structure. Since the thickness of the valve plate is relatively thin (L=1.2mm~1.6mm), the position between the first intake hole 523, the first exhaust hole 521 and the second exhaust hole 522 is a flexible area. If the diameter of the exhaust hole is too large, deformation is more likely to occur. Therefore, using two exhaust holes can enhance the rigidity of the flexible area and prevent deformation or breakage.

[0044] In some embodiments, the valve plate 52 is further configured with a first air inlet hole 524 and a second air inlet hole 525, and the intake valve plate 51 is further configured with a third air inlet hole 514 corresponding to the first air inlet hole 524 and a fourth air inlet hole 515 corresponding to the second air inlet hole 525, and the airflow discharged from the first exhaust channel and the second exhaust channel can enter the first exhaust silencer chamber 31 via the first air inlet hole 524 and the third air inlet hole 514 in sequence, and / or the airflow discharged from the first exhaust channel and the second exhaust channel can enter the second exhaust silencer chamber 32 via the second air inlet hole 525 and the fourth air inlet hole 515 in sequence. In this way, the airflow discharged from the first exhaust channel and the second exhaust channel can be respectively guided to the first exhaust silencer chamber 31 and the second exhaust silencer chamber 32 via the air guide channel on the air valve assembly, making the structure inside the outer shell 1 more compact and reasonable, without the need to separately add corresponding pipelines between the first exhaust silencer chamber 31, the second exhaust silencer chamber 32 and the first exhaust channel and the second exhaust channel.

[0045] According to an embodiment of the present invention, there is further provided a refrigerator, comprising a piston compressor, wherein the piston compressor is the above-mentioned piston compressor. Figure 8 The refrigeration system corresponding to the refrigerator of the present invention is shown, which specifically includes a piston compressor 100, an evaporator 101, a throttling element 102 (for example, a capillary or an electronic expansion valve), and a condenser 103. The high-temperature and low-pressure refrigerant vapor comes out of the evaporator 101 and enters the piston compressor 100 for compression. After compression, the high-temperature and high-pressure refrigerant gas is discharged from the first exhaust channel and the second exhaust channel of the gas valve assembly, wherein a part of the gas enters the first exhaust muffler cavity 31 from the air inlet channel on one side, and then enters the first shell inner section 41 and then is discharged through the first exhaust pipe. Out to the condenser 103, a part of the gas enters the second exhaust silencer chamber 32 from the air inlet channel on the other side, and then enters the second shell inner section 42 and then is discharged to the condenser 103 through the second exhaust pipe. Since the structure of the first shell inner section 41 and the second shell inner section 42 is simple, the resistance loss along the refrigerant gas is small, and the gas pressure of the two pipelines is equivalent. The discharged gas is mixed when entering the condenser 103. Compared with the conventional compressor, the exhaust volume of the compressor is increased, and the resistance loss along the way is reduced, the power consumption of the compressor is reduced, and the cooling capacity of the system is improved.

[0046] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A piston compressor, comprising a housing (1) and a core assembly, wherein the bottom of the core assembly is connected to the housing (1) via a shock absorbing component, and the core assembly comprises a cylinder seat (21). It is characterized in that The invention also comprises a first exhaust pipe (45) and a second exhaust pipe (46); the first exhaust pipe (45) has a first shell section (41); the second exhaust pipe (46) has a second shell section (42); two ends of the first shell section (41) are respectively connected to the cylinder seat (21) and the shell (1); two ends of the second shell section (42) are respectively connected to the cylinder seat (21) and the shell (1); the cylinder seat (21) is a symmetrical structure symmetrical about a first symmetry plane; the first shell section (41) and the second shell section (42) are respectively located on two sides of the first symmetry plane; the first shell section (41) and the second shell section (42) are symmetrical about the first symmetry plane.

2. The piston compressor according to claim 1, It is characterized in that A first exhaust silencer chamber (31) and a second exhaust silencer chamber (32) are constructed on the cylinder seat (21); two ends of the first shell inner section (41) are respectively connected to the first exhaust silencer chamber (31) and the shell (1); and two ends of the second shell inner section (42) are respectively connected to the second exhaust silencer chamber (32) and the shell (1).

3. The piston compressor according to claim 2, It is characterized in that The first inner shell section (41) comprises a first connecting section (411) connected to the first exhaust muffler chamber (31), a second connecting section (412) connected to the outer shell (1), and a U-bend structure between the first connecting section (411) and the second connecting section (412).

4. The piston compressor according to claim 3, It is characterized in that The U-bend structure comprises a first U-bend (43) and a second U-bend (44).

5. The piston compressor according to claim 4, It is characterized in that The first U-bend (43) comprises a first tube (431) connected to the first connecting section (411), a second tube (432) parallel to the first tube (431), and a third tube (433) connected between the first tube (431) and the second tube (432); the second U-bend (44) and the first U-bend (43) share the second tube (432); the second U-bend (44) further comprises a fourth tube (434) located between the second connecting section (412) and the second tube (432).

6. The piston compressor according to claim 5, It is characterized in that The plane where the first U-bend (43) is located is not in the same plane as the plane where the second U-bend (44) is located; and / or the opening direction of the first U-bend (43) is opposite to the opening direction of the second U-bend (44).

7. The piston compressor according to claim 5, It is characterized in that In a plane formed by the first connecting section (411) and the first tube (431), an angle between the two tubes is a, 100°≤a≤120°; and / or, in a plane formed by the first tube (431) and the third tube (433), an angle between the two tubes is b, 60°≤b≤90°; and / or, in a plane formed by the second tube (432) and the third tube (433), an angle between the two tubes is c, 60°≤c≤90°; and / or, in a plane formed by the second tube (432) and the fourth tube (434), an angle between the two tubes is d, 60°≤d≤90°; and / or, in a plane formed by the second connecting section (412) and the fourth tube (434), an angle between the two tubes is e, 60°≤e≤90°.

8. The piston compressor according to claim 7, It is characterized in that b=c; and / or, d=e.

9. The piston compressor according to claim 2, It is characterized in that The movement assembly further comprises a cylinder head assembly (5), the cylinder head assembly (5) comprising an air valve assembly, the air valve assembly having a first exhaust channel and a second exhaust channel, the first exhaust channel and the second exhaust channel being in communication with the first exhaust silencer chamber (31) and the second exhaust silencer chamber (32).

10. The piston compressor according to claim 9, It is characterized in that The air valve assembly comprises a valve plate (52) and an exhaust valve sheet (53); the movement assembly further comprises a pump body assembly (6); the exhaust valve sheet (53) is located on a side of the valve plate (52) away from the pump body assembly (6); a first exhaust through hole (521) corresponding to the first exhaust channel and a second exhaust through hole (522) corresponding to the second exhaust channel are formed on the valve plate (52); and a first exhaust valve tongue (531) corresponding to the first exhaust through hole (521) and a second exhaust valve tongue (532) corresponding to the second exhaust through hole (522) are provided on the exhaust valve sheet (53).

11. The piston compressor according to claim 10, It is characterized in that The air valve assembly further comprises an air intake valve plate (51), the air intake valve plate (51) having an air intake valve tongue (511), the air intake valve tongue (511) being provided with a third air intake through hole (512) corresponding to the first air intake through hole (521), and a fourth air intake through hole (513) corresponding to the second air intake through hole (522), the first air intake through hole (521) and the third air intake through hole (512) forming the first air intake channel, and the second air intake through hole (522) and the fourth air intake through hole (513) forming the second air intake channel.

12. The piston compressor according to claim 10, It is characterized in that The opening of the first exhaust through hole (521) on one side facing the exhaust valve plate (53) is expanded; and / or the opening of the second exhaust through hole (522) on one side facing the exhaust valve plate (53) is expanded.

13. The piston compressor according to claim 12, It is characterized in that The generatrix of the flared opening is an arc line.

14. The piston compressor according to claim 11, It is characterized in that The valve plate (52) is provided with a first air intake through hole (523) corresponding to the sealing tongue of the air intake valve tongue (511), and the exhaust valve plate (53) is provided with a second air intake through hole (533) corresponding to the first air intake through hole (523); and / or the valve plate (52) is further provided with a first air inlet through hole (524) and a second air inlet through hole (525), and the air intake valve plate (51) is further provided with a third air inlet through hole (514) and a third air inlet through hole (515) corresponding to the first air inlet through hole (524). The fourth air bleed hole (515) corresponds to the second air bleed hole (525), and the airflow discharged from the first exhaust channel and the second exhaust channel can enter the first exhaust silencer chamber (31) via the first air bleed hole (524) and the third air bleed hole (514) in sequence, and / or the airflow discharged from the first exhaust channel and the second exhaust channel can enter the second exhaust silencer chamber (32) via the second air bleed hole (525) and the fourth air bleed hole (515) in sequence.

15. A refrigerator comprising a piston compressor, It is characterized in that The piston compressor is the piston compressor according to any one of claims 1 to 14.

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