Piston mechanism, compressor and household appliance

Abstract

The application provides a piston mechanism, a compressor and a household appliance. The piston mechanism comprises a cylinder seat, a sealing element and two pistons. The cylinder seat has a cylinder cavity and a communication channel. The communication channel has a preset position between a first end and a second end. The two pistons divide the cylinder cavity into a first cavity part and a second cavity part. The preset position of the communication channel is in communication with the first cavity part, and the second end of the communication channel is in communication with the second cavity part. The sealing element is arranged in the communication channel and located between the preset position and the second end or at the preset position, so that the first cavity part and the second cavity part are in a disconnected state. The sealing element is elastically connected to the first end of the communication channel, so that when the pressure of the second cavity part is greater than that of the first cavity part, the airflow drives the sealing element to move between the preset position and the first end of the communication channel, thereby connecting the second cavity part and the first cavity part. The piston mechanism solves the problem of low refrigeration efficiency of the compressor in the prior art.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a piston mechanism, a compressor, and a household appliance. Background Technology

[0002] As people's living standards improve, their demands for the performance of home appliances are constantly increasing. In terms of application areas and market share, compression refrigeration cycles still dominate the refrigerator market, with inverter and high-capacity refrigerators becoming the mainstream. The market demand for high-efficiency refrigerator compressors is rapidly increasing, and the development of high-efficiency compressors requires, to a certain extent, improving the cooling capacity of compressors.

[0003] In addition to optimizing the design of the compressor valve assembly, structural design should also be carried out on the moving parts of the compressor to improve suction efficiency and increase cooling capacity.

[0004] The piston compressor operates by rotating the crankshaft to drive the piston and connecting rod in a reciprocating motion. Its disadvantages are that the compressor has a large pressure ratio and low refrigeration efficiency, and the refrigerator's cooling capacity cannot meet customer needs. Summary of the Invention

[0005] The main objective of this invention is to provide a piston mechanism, a compressor, and a household appliance to solve the problem of low refrigeration efficiency in existing compressors.

[0006] To achieve the above objectives, according to one aspect of the present invention, a piston mechanism is provided, comprising: a cylinder seat having a cylinder cavity and a communicating channel; the communicating channel having a first end and a second end disposed opposite to each other along its extending direction; the communicating channel having a predetermined portion located between its first end and the second end; two pistons being spaced apart along the length direction of the cylinder cavity to divide the cylinder cavity into a first cavity and a second cavity; the predetermined portion of the communicating channel communicating with the first cavity, and the second end of the communicating channel communicating with the second cavity; a seal disposed within the communicating channel and located between or at the predetermined portion of the communicating channel and the second end of the communicating channel, such that the first cavity and the second cavity are in a disconnected state; the seal being elastically connected to the first end of the communicating channel, such that when the pressure in the second cavity is greater than the pressure in the first cavity, airflow drives the seal to move between the predetermined portion and the first end of the communicating channel, thereby connecting the second cavity and the first cavity.

[0007] Furthermore, the two pistons are elastically connected, forming a second cavity between them, so that the two pistons move closer or further apart under elastic force, thereby increasing or decreasing the pressure in the second cavity.

[0008] Furthermore, the piston mechanism also includes a first elastic element; along the extension and retraction direction of the first elastic element, the first elastic element has a first end and a second end disposed opposite to each other; the first end and the second end of the first elastic element are respectively connected to the two pistons.

[0009] Furthermore, the cylinder cavity has a first end and a second end disposed opposite to each other along its length direction, and the first end of the cylinder cavity is closed; the two pistons are a first piston and a second piston, respectively, and the second piston is located on the side of the first piston away from the first end of the cylinder cavity; a first cavity is formed between the first piston and the first end wall of the cylinder cavity.

[0010] Furthermore, the second piston is used to connect with the drive assembly; when the drive assembly drives the second piston to move away from the first end of the cylinder cavity, the second piston drives the first piston to move. The second cavity draws air from the side of the second piston away from the first piston through the intake valve plate provided on the second piston, and the first cavity draws air from the outside of the first end wall of the cylinder cavity through the intake valve plate provided on the first end wall of the cylinder cavity; after the second cavity completes the intake, the first piston continues to move away from the first end of the cylinder cavity under the action of elastic force, so that the airflow in the second cavity flows into the first cavity through the connecting channel; when the drive assembly... When the second piston moves towards the first end of the cylinder chamber, it approaches the first piston under the elastic force, so that the pressure in the second chamber is greater than the pressure in the first chamber. This causes the airflow in the second chamber to flow into the first chamber, and at the same time, the airflow in the second chamber pushes the first piston to move, so that the gas in the first chamber is discharged to the outside of the first end wall of the cylinder chamber through the exhaust valve plate provided on the first end wall. After the second chamber has finished venting, the seal springs back to the preset position between the second end and the connecting channel. Under the action of the elastic force, the first piston continues to move towards the first end of the cylinder chamber.

[0011] Furthermore, the piston mechanism also includes a second elastic element; along the extension and retraction direction of the second elastic element, the second elastic element has a first end and a second end disposed opposite to each other; the first end and the second end of the second elastic element are respectively connected to the first end of the connecting channel and the seal; and / or, there are multiple seals and multiple connecting channels, and the multiple seals are disposed in the multiple connecting channels in a one-to-one correspondence; the multiple connecting channels are disposed at intervals along the circumference of the cylinder cavity.

[0012] Furthermore, a limiting channel is provided on the cavity wall of the cylinder, and the extending direction of the limiting channel is parallel or the same as the length direction of the cylinder; a limiting part is provided on the first piston, and the limiting part is slidably disposed in the limiting channel so as to limit the movement stroke of the first piston by abutting against the two ends of the limiting channel respectively.

[0013] Furthermore, there are multiple limiting channels, which are spaced apart circumferentially along the cylinder cavity; there are multiple limiting parts, which are spaced apart circumferentially along the first piston; the multiple limiting parts are arranged in a one-to-one correspondence with the multiple limiting channels; the two ends of each limiting channel are a first end and a second end, respectively; the first end faces of the multiple limiting channels are located on the same plane, and the plane containing the first end faces of the multiple limiting channels is perpendicular to the length direction of the cylinder cavity; the second end faces of the multiple limiting channels are located on the same plane, and the plane containing the second end faces of the multiple limiting channels is perpendicular to the length direction of the cylinder cavity.

[0014] Furthermore, the height of the second piston is n times the height of the first piston, where n is greater than 1; the height direction of the second piston and the height direction of the first piston are both parallel to the length direction of the cylinder cavity.

[0015] According to another aspect of the invention, a compressor is provided that includes the piston mechanism described above.

[0016] According to another aspect of the present invention, a household appliance is provided, which includes the compressor described above.

[0017] According to the technical solution of this invention, the piston mechanism includes a cylinder seat, a seal, and two pistons. The cylinder seat has a cylinder cavity and a communicating channel; the communicating channel has a first end and a second end disposed opposite to each other along its extending direction; along the extending direction of the communicating channel, the communicating channel has a predetermined portion located between its first end and the second end; the two pistons are spaced apart along the length direction of the cylinder cavity to divide the cylinder cavity into a first cavity and a second cavity; the predetermined portion of the communicating channel communicates with the first cavity, and the second end of the communicating channel communicates with the second cavity.

[0018] A seal is disposed within the communicating channel; along the extending direction of the communicating channel, the seal is located between a predetermined portion of the communicating channel and the second end, or the seal is located at a predetermined portion of the communicating channel, so that the first cavity and the second cavity are in a disconnected state. The seal is elastically connected to the first end of the communicating channel, so that the seal is extendable and retractable along the extending direction of the communicating channel.

[0019] When the pressure in the second chamber is equal to the pressure in the first chamber, the seal is in a natural state, neither stretched nor compressed. At this time, the seal is located between or at a predetermined position on the connecting channel, and the first and second chambers are disconnected. When the pressure in the second chamber is greater than the pressure in the first chamber, the airflow in the second chamber flows into the connecting channel and exerts a pushing force on the seal, causing it to move from the second end to the first end of the connecting channel. This moves the seal to a position between the predetermined position and the first end of the connecting channel, thus connecting the second and first chambers. At this time, the airflow in the second chamber flows into the first chamber through the connecting channel. The gas flowing from the second chamber into the first chamber is then compressed a second time within the first chamber. This two-stage compression effectively increases the compressor's cooling capacity, thus solving the problem of low cooling efficiency in existing compressors. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 A schematic diagram of the compressor according to the present invention is shown;

[0022] Figure 2 A schematic diagram of the cylinder block of the compressor according to the present invention is shown (the first end wall of the cylinder cavity has been removed);

[0023] Figure 3 A longitudinal sectional view of the compressor according to the present invention is shown (section lines removed);

[0024] Figure 4 A schematic diagram of the composition of the compressor according to the present invention, including two pistons, connecting rods, and crankshaft, is shown.

[0025] Figure 5 A schematic diagram of the structure of the first piston of the piston mechanism according to the present invention is shown;

[0026] Figure 6 A schematic diagram of the structure of the second piston of the piston mechanism according to the present invention is shown;

[0027] Figure 7 A schematic diagram of the composition of the first piston, the first elastic element, and the second piston of the piston mechanism according to the present invention is shown.

[0028] Figure 8 A schematic diagram of the composition of the seal and the second elastic element of the piston mechanism according to the present invention is shown;

[0029] Figure 9A schematic diagram of the structure of the piston mechanism according to the present invention, wherein the sealing element and the second elastic element are arranged in the communicating channel, is shown.

[0030] Figure 10 A schematic diagram of the seal of the piston mechanism according to the present invention is shown;

[0031] Figure 11 A schematic diagram of the structure of the second elastic element of the piston mechanism according to the present invention is shown.

[0032] The above figures include the following reference numerals:

[0033] 11. First piston; 111. Limiting part; 12. Second piston; 121. Second intake valve plate; 122. Mounting hole; 123. Mounting groove; 124. Port;

[0034] 30. First elastic element;

[0035] 40. Cylinder seat; 41. Cylinder chamber; 411. First chamber; 412. Second chamber; 42. Connecting channel; 43. First channel; 44. Second channel; 45. Limiting channel;

[0036] 50. Sealing element; 501. Sealing part; 502. Connecting part; 51. Second elastic element;

[0037] 60. Crankshaft; 601. Eccentric shaft section; 61. Connecting rod; 62. Piston pin; 63. Locating pin. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] This invention provides a piston mechanism, please refer to... Figures 1 to 11The piston mechanism includes a cylinder seat 40, a seal 50, and two pistons. The cylinder seat 40 has a cylinder cavity 41 and a communicating channel 42; the communicating channel 42 has a first end and a second end disposed opposite to each other along its extending direction; along the extending direction of the communicating channel 42, the communicating channel 42 has a predetermined portion located between its first end and the second end; the two pistons are spaced apart along the length direction of the cylinder cavity 41 to divide the cylinder cavity 41 into a first cavity portion 411 and a second cavity portion 412; the predetermined portion of the communicating channel 42 communicates with the first cavity portion 411, and the second end of the communicating channel 42 communicates with the second cavity portion 412.

[0042] A sealing element 50 is disposed within the communicating channel 42. Along the extending direction of the communicating channel 42, the sealing element 50 is located between a predetermined portion and the second end of the communicating channel 42, or the sealing element 50 is located at a predetermined portion of the communicating channel 42, so that the first cavity 411 and the second cavity 412 are in a disconnected state. The sealing element 50 is elastically connected to the first end of the communicating channel 42, so that the sealing element 50 is extensibly and retractably disposed along the extending direction of the communicating channel 42. Wherein, the elastic connection between the sealing element 50 and the first end of the communicating channel 42 means that the sealing element 50 is connected to the first end of the communicating channel 42, and the sealing element 50 is elastically and retractably disposed relative to the first end of the communicating channel 42 along the extending direction of the communicating channel 42.

[0043] When the pressure in the second cavity 412 is equal to the pressure in the first cavity 411, the seal 50 is in a natural state where it is neither stretched nor compressed. At this time, the seal 50 is located between the preset part and the second end of the connecting channel 42 or at the preset part, and the first cavity 411 and the second cavity 412 are in a disconnected state. When the pressure in the second cavity 412 is greater than the pressure in the first cavity 411, the airflow in the second cavity 412 flows into the connecting channel 42 and exerts a pushing force on the seal 50, causing the seal 50 to move along the direction from the second end to the first end of the connecting channel 42. This causes the seal 50 to move to a preset position between the first end and the connecting channel 42, thereby making the second cavity 412 and the first cavity 411 connected. At this time, the airflow in the second cavity 412 flows into the first cavity 411 through the connecting channel 42. The gas flowing from the second cavity 412 into the first cavity 411 is compressed twice in the first cavity 411. The two-stage compression can effectively improve the cooling capacity of the compressor, thereby solving the problem of low cooling efficiency of the compressor in the prior art.

[0044] The cylinder chamber 41 is divided into a first chamber 411 and a second chamber 412 by two pistons to increase the displacement of the compressor.

[0045] Optionally, the extension direction of the connecting channel 42 is parallel to the length direction of the cylinder cavity 41.

[0046] In this embodiment, the two pistons are elastically connected, forming a second cavity 412 between them. This allows the two pistons to move closer or further apart under elastic force, thereby reducing or increasing the distance between them. In other words, the volume of the second cavity 412 decreases or increases, resulting in an increase or decrease in pressure within the second cavity 412. When the pressure in the second cavity 412 increases, it is greater than the pressure in the first cavity 411. The elastic connection between the two pistons means that they are connected, and one piston can be elastically extended or contracted relative to the other along the distribution direction of the two pistons.

[0047] Specifically, the piston mechanism further includes a first elastic member 30; along the extension and retraction direction of the first elastic member 30, the first elastic member 30 has a first end and a second end that are disposed opposite to each other; the first end and the second end of the first elastic member 30 are respectively connected to the two pistons so that the two pistons are elastically connected.

[0048] Optionally, the first elastic element 30 is a spring or other elastic structure.

[0049] Specifically, the second piston 12 is provided with a mounting hole 122, which is located on the side end face of the second piston 12 facing the first piston 11; the second end of the first elastic member 30 is fixedly installed in the mounting hole 122.

[0050] Optionally, there are multiple first elastic elements 30, and the extension and retraction directions of the multiple first elastic elements 30 are parallel; the multiple first elastic elements 30 are arranged at radial intervals along the cylinder cavity 41. Further, the second piston 12 is provided with multiple mounting holes 122, and the second ends of the multiple first elastic elements 30 are installed in the multiple mounting holes 122 in a one-to-one correspondence.

[0051] In this embodiment, the cylinder cavity 41 has a first end and a second end disposed opposite to each other along its length, and the first end of the cylinder cavity 41 is closed. The two pistons are a first piston 11 and a second piston 12, with the second piston 12 located on the side of the first piston 11 away from the first end of the cylinder cavity 41. A first cavity 411 is formed between the first piston 11 and the first end wall of the cylinder cavity 41, and a second cavity 412 is formed between the first piston 11 and the second piston 12. The second piston 12 is used to connect to a drive assembly.

[0052] When the drive assembly drives the second piston 12 to move away from the first end of the cylinder chamber 41, that is, when the drive assembly drives the second piston 12 to move along the direction from the first end to the second end of the cylinder chamber 41, the gas in the space on the side of the second piston 12 away from the first piston 11 is compressed. The gas pressure in the space on the side of the second piston 12 away from the first piston 11 is greater than the pressure in the second chamber 412. Therefore, the intake valve plate provided on the second piston 12 opens, and the second chamber 412 draws air from the side of the second piston 12 away from the first piston 11 through the intake valve plate provided on the second piston 12. The second piston 12 drives the first piston 11 to move, the volume of the first chamber 411 increases and the pressure decreases. Therefore, the intake valve plate provided on the first end wall of the cylinder chamber 41 opens, so that the first chamber 411 draws air from the outside of the first end wall of the cylinder chamber 41 through the intake valve plate provided on the first end wall of the cylinder chamber 41. Because of the elastic connection between the two pistons, when the second chamber 412 draws in air, the airflow entering the second chamber 412 stretches the first elastic element 30. Then, when the second piston 12 reaches its maximum stroke, that is, after the second chamber 412 has finished drawing in air, the first piston 11 continues to move away from the first end of the cylinder chamber 41 under the elastic force of the first elastic element 30. At this time, the second piston 12 stops moving, the gas in the second chamber 412 is compressed, the pressure in the second chamber 412 increases, and the airflow in the second chamber 412 flows into the connecting channel 42, generating a pushing force on the sealing element 50, thereby driving the sealing element 50 to move from the second end to the first end of the connecting channel 42. This causes the seal 50 to move to the preset position between the connecting channel 42 and the first end, thereby making the second cavity 412 and the first cavity 411 connected. At this time, the airflow in the second cavity 412 will flow into the first cavity 411 through the connecting channel 42. As for whether the first cavity 411 will still draw air from the outside of the first end wall of the cylinder cavity 41 through the suction valve plate provided on the first end wall of the cylinder cavity 41 after the airflow in the second cavity 412 flows into the first cavity 411, it depends on the pressure difference between the pressure of the first cavity 411 and the pressure of the external environment. However, during the suction process, the pressure of the first cavity 411 can only be less than or equal to the pressure of the external environment, and cannot be greater than the pressure of the external environment.

[0053] That is, during the entire intake process of the first chamber 411, before the second chamber 412 completes intake, the first chamber 411 draws air from the outside of the first end wall of the cylinder chamber 41 through the intake valve plate provided on the first end wall of the cylinder chamber 41; after the second chamber 412 completes intake, the gas entering the first chamber 411 mainly includes the gas flowing in from the second chamber 412, and may also include the gas drawn in from the outside of the first end wall of the cylinder chamber 41.

[0054] It should be noted that after the second chamber 412 completes its intake, the second piston 12 will stop for a period of time until the first chamber 411 also completes its intake; then the second piston 12 will begin to move again to perform the exhaust process. After the first chamber 411 completes its intake, the first elastic element 30 returns to its natural state of not being stretched or compressed.

[0055] When the drive assembly drives the second piston 12 to move towards the first end of the cylinder chamber 41, that is, when the drive assembly drives the second piston 12 to move along the direction from the second end to the first end of the cylinder chamber 41, the second piston 12 approaches the first piston 11 under elastic force, and the first elastic member 30 is compressed, so that the volume of the second cavity 412 is compressed, thereby making the pressure in the second cavity 412 greater than the pressure in the first cavity 411. The airflow in the second cavity 412 flows into the connecting channel 42 and generates a pushing force on the seal 50, so as to drive the seal 50 to move along the direction from the second end to the first end of the connecting channel 42. The sealing element 50 is moved to a position between the preset location and the first end of the connecting channel 42, thereby connecting the second cavity 412 and the first cavity 411. At this time, the airflow in the second cavity 412 flows into the first cavity 411 through the connecting channel 42. Simultaneously, due to the compression of the volume of the second cavity 412, the airflow in the second cavity 412 pushes the first piston 11 towards the first end of the cylinder cavity 41, so that the gas in the first cavity 411 is discharged to the outside of the first end wall of the cylinder cavity 41 through the exhaust valve plate provided on the first end wall. That is, the first piston 11 and the second piston 12 simultaneously compress and exhaust. When the second cavity 412 reaches its maximum stroke, that is, when the second cavity 412 has completed exhaust, the pressure in the second cavity 412 is no longer greater than the pressure in the first cavity 411. Therefore, the sealing element 50 rebounds under the action of elastic force to a position between the preset location and the second end of the connecting channel 42 or to a preset location, so that the first cavity 411 and the second cavity 412 return to the disconnected state. When the second chamber 412 reaches its maximum stroke, that is, when the second chamber 412 has finished venting, the second piston 12 stops moving. Under the action of the elastic force of the compressed first elastic element 30, the first piston 11 continues to move towards the first end of the cylinder chamber 41. The gas in the first chamber 411 continues to be compressed. The gas in the first chamber 411 is discharged to the outside of the first end wall of the cylinder chamber 41 through the exhaust valve plate provided on the first end wall until the first chamber 411 has finished venting.

[0056] It should be noted that after the second chamber 412 finishes venting, the second piston 12 will stop for a period of time until the first chamber 411 also finishes venting; then the second piston 12 will start moving again to perform the intake process. After the first chamber 411 finishes venting, the first elastic member 30 returns to its natural state of not being stretched or compressed.

[0057] It should be noted that the gas flowing into the first chamber 411 from the second chamber 412 is compressed twice within the first chamber 411. This two-stage compression effectively increases the compressor's cooling capacity and improves the system's energy efficiency ratio. The gas discharged from the first chamber 411 is a mixture of the gas that has undergone only one compression within the first chamber 411 and the gas that has undergone a second compression from the second chamber 412.

[0058] Specifically, the first cavity 411 is a high-pressure cavity, and the second cavity 412 is a low-pressure cavity.

[0059] In this embodiment, the second piston 12 has a second intake channel; the second intake channel extends through the second piston 12 along the length direction of the cylinder cavity 41; the second intake channel has a first end and a second end that are disposed opposite to each other along the length direction of the cylinder cavity 41; the first end of the second intake channel is disposed toward the first piston 11; a second intake valve plate 121 is disposed at the first end of the second intake channel, and the second end of the second intake channel is spatially connected to the side of the second piston 12 away from the first piston 11.

[0060] When the pressure in the second chamber 412 and the space on the side of the second piston 12 away from the first piston 11 are equal, the second intake valve plate 121 seals the first end of the second intake channel. When the second piston 12 moves away from the first end of the cylinder chamber 41, the gas in the space on the side of the second piston 12 away from the first piston 11 is compressed, and the pressure in the space on the side of the second piston 12 away from the first piston 11 is greater than the pressure in the second chamber 412. The gas in the space on the side of the second piston 12 away from the first piston 11 pushes the second intake valve plate 121 to move closer to the first piston 11, thereby causing the second intake valve plate 121 to move away from the first end of the second intake channel. This allows the second intake channel to communicate with the second chamber 412 through its first end, allowing the gas in the space on the side of the second piston 12 away from the first piston 11 to flow into the second chamber 412, thus achieving intake in the second chamber 412. When the second piston 12 moves towards the first end of the cylinder chamber 41, the volume of the second chamber 412 decreases, and the gas pressure inside the second chamber 412 increases. This gas pressure is greater than the pressure in the space on the side of the second piston 12 furthest from the first piston 11. The gas in the second chamber 412 exerts a thrust on the second intake valve plate 121 in a direction away from the first piston 11, thus keeping the second intake valve plate 121 closed at the first end of the second intake passage. Installing the valve plate on the piston saves compressor costs, simplifies the process, and facilitates installation.

[0061] Specifically, a mounting groove 123 is provided on the side of the second piston 12 facing the first piston 11, and the mounting groove 123 is connected to the first end of the second suction channel; the second suction valve plate 121 is installed in the mounting groove 123.

[0062] Specifically, the outline shape of the second intake valve plate 121 is the same as the outline shape of the mounting groove 123, so that the second intake valve plate 121 is embedded in the mounting groove 123, and the outer periphery of the second intake valve plate 121 is in contact with or has a gap with the groove sidewall of the mounting groove 123.

[0063] Specifically, the surface of the second intake valve plate 121 facing the first piston 11 is flush with the side end face of the second piston 12 facing the first piston 11; or, the surface of the second intake valve plate 121 facing the first piston 11 is located inside the groove of the mounting groove 123.

[0064] Figure 6 Port 124 in the diagram is the first port of the second intake channel.

[0065] Optionally, the second intake valve plate 121 can be fixed by spot welding or by metal glue.

[0066] In this embodiment, a first intake channel is provided on the first end wall of the cylinder cavity 41, and the first intake channel penetrates the first end wall of the cylinder cavity 41 along the length direction of the cylinder cavity 41; the first intake channel has a first end and a second end that are arranged opposite to each other along the length direction of the cylinder cavity 41; the first end of the first intake channel is located on the outer wall surface of the first end of the cylinder cavity 41, and the second end of the first intake channel is located on the inner wall surface of the first end of the cylinder cavity 41; a first intake valve plate is provided at the second end of the first intake channel.

[0067] When the pressure in the first chamber 411 is equal to the ambient air pressure, the first intake valve seals the second end of the first intake channel. When the first piston 11 moves away from the first end of the cylinder chamber 41, the volume of the first chamber 411 increases, and the pressure in the first chamber 411 decreases, so that the pressure in the first chamber 411 is less than the ambient air pressure. The gas in the ambient air will push the first intake valve to move closer to the first piston 11, thereby moving the first intake valve away from the second end of the first intake channel. This allows the first intake channel to connect with the first chamber 411 through its second end, allowing the gas in the ambient air to flow into the first chamber 411, thus achieving intake in the first chamber 411. When the first piston 11 moves toward the first end of the cylinder chamber 41, the volume of the first chamber 411 decreases, the air pressure inside the first chamber 411 increases, and the air pressure inside the first chamber 411 is greater than the air pressure of the external environment. The gas inside the first chamber 411 will exert a thrust on the first intake valve plate in a direction away from the first piston 11, thereby keeping the first intake valve plate in a state of sealing the second end of the first intake passage.

[0068] In this embodiment, an exhaust passage is provided on the first end wall of the cylinder cavity 41, and the exhaust passage penetrates the first end wall of the cylinder cavity 41 along the length direction of the cylinder cavity 41; the exhaust passage has a first end and a second end that are arranged opposite to each other along the length direction of the cylinder cavity 41; the first end of the exhaust passage is located on the outer wall surface of the first end of the cylinder cavity 41, and the second end of the exhaust passage is located on the inner wall surface of the first end of the cylinder cavity 41; an exhaust valve plate is provided on the first end of the exhaust passage.

[0069] When the pressure in the first chamber 411 equals the ambient air pressure, the exhaust valve plate seals the first end of the exhaust passage. When the first piston 11 moves towards the first end of the cylinder chamber 41, the volume of the first chamber 411 decreases, and the pressure in the first chamber 411 increases, making the pressure in the first chamber 411 greater than the ambient air pressure. The gas in the first chamber 411 pushes the exhaust valve plate away from the first piston 11, thus moving the exhaust valve plate away from the first end of the exhaust passage. This allows the exhaust passage to connect with the ambient environment through its first end, allowing the gas in the first chamber 411 to flow into the ambient environment, achieving exhaust from the first chamber 411. When the first piston 11 moves away from the first end of the cylinder chamber 41, the volume of the first chamber 411 increases, and the pressure in the first chamber 411 decreases, becoming less than the ambient air pressure. The gas in the ambient environment exerts a thrust on the exhaust valve plate towards the first piston 11, thus keeping the exhaust valve plate in a state of sealing the first end of the exhaust passage.

[0070] In this embodiment, the piston mechanism further includes a second elastic member 51; along the extension and retraction direction of the second elastic member 51, the second elastic member 51 has a first end and a second end that are disposed opposite to each other; the first end and the second end of the second elastic member 51 are respectively connected to the first end of the connecting channel 42 and the sealing member 50, so as to realize the elastic connection between the sealing member 50 and the first end of the connecting channel 42.

[0071] Optionally, the second elastic element 51 is a spring.

[0072] Optionally, the first end of the connecting channel 42 is closed, and the first end of the second elastic member 51 is fixedly connected to the first end wall of the connecting channel 42. Alternatively, the first end of the connecting channel 42 can pass through the cylinder seat 40, and the first end of the second elastic member 51 can be fixedly connected to the inner peripheral wall of the first end of the connecting channel 42; and a sealing material can be used to seal the first end of the connecting channel 42 to prevent air leakage from the cylinder cavity 41.

[0073] In this embodiment, as Figure 10 As shown, the sealing member 50 includes a sealing part 501, which is used to stop between a preset part and the second end of the communicating channel 42, so that the first cavity 411 and the second cavity 412 are in a disconnected state.

[0074] Specifically, the sealing part 501 has a cylindrical structure, the circumferential surface of the sealing part 501 contacts the channel wall of the connecting channel 42, and the sealing part 501 is slidably disposed along the connecting channel 42.

[0075] Specifically, such as Figure 8 and Figure 10 As shown, the sealing member 50 further includes a connecting portion 502, which is fixedly connected to the sealing portion 501. The connecting portion 502 has a first end connected to the sealing portion 501 and a second end away from the sealing portion 501. From the first end to the second end of the connecting portion 502, the cross-section of the connecting portion 502, perpendicular to the distribution direction of its first and second ends, gradually decreases. From the first end to the second end of the connecting portion 502, the connecting portion 502 passes through the central channel of the second elastic member 51, and the second elastic member 51 is fixedly connected to the connecting portion 502. The connecting portion 502 is provided to facilitate the connection between the sealing member 50 and the second elastic member 51.

[0076] Optionally, the connecting part 502 has a conical structure; for example, the connecting part 502 has a conical structure.

[0077] Optionally, the seal 50 is a one-piece molded structure.

[0078] Optionally, the seal 50 is made of elastic rubber material to provide a good seal for the communication channel 42.

[0079] In this embodiment, the cylinder seat 40 has a first channel 43. The first end of the first channel 43 is connected to the first cavity 411, and the second end of the first channel 43 is connected to a preset part of the connecting channel 42, so that the first cavity 411 is connected to the preset part of the connecting channel 42 through the first channel 43.

[0080] In this embodiment, the cylinder seat 40 has a second channel 44. The first end of the second channel 44 is connected to the second cavity 412, and the second end of the second channel 44 is connected to the second end of the connecting channel 42, so that the second cavity 412 is connected to the second end of the connecting channel 42 through the second channel 44; that is, the gas in the second cavity 412 enters the first cavity 411 after passing through the second channel 44, the connecting channel 42 and the first channel 43 in sequence.

[0081] In this embodiment, the cylinder seat 40 has a channel unit, which includes a first channel 43, a second channel 44, and a connecting channel 42. The piston mechanism includes a sealing assembly, which includes a seal 50 and a second elastic member 51.

[0082] In this embodiment, there are multiple seals 50 and multiple connecting channels 42. The multiple seals 50 are arranged one-to-one in the multiple connecting channels 42. The multiple connecting channels 42 are arranged at intervals along the circumference of the cylinder cavity 41.

[0083] Specifically, there are multiple channel units, which are spaced apart circumferentially along the cylinder cavity 41.

[0084] Specifically, there are multiple sealing components, and each sealing component is configured in a one-to-one correspondence with a multiple channel unit.

[0085] In this embodiment, a limiting channel 45 is provided on the cavity wall of the cylinder cavity 41, and the extending direction of the limiting channel 45 is parallel or the same as the length direction of the cylinder cavity 41; a limiting part 111 is provided on the first piston 11, and the limiting part 111 is slidably disposed in the limiting channel 45 so as to limit the movement stroke of the first piston 11 by the limiting part 111 abutting against the two ends of the limiting channel 45 respectively.

[0086] Specifically, the limiting channel 45 has a first end and a second end disposed opposite to each other along its extending direction; the orientation of the first end to the second end of the limiting channel 45 is the same as the orientation of the first end to the second end of the cylinder cavity 41. The process of the limiting part 111 sliding from the first end to the second end of the limiting channel 45 is the intake process of the first cavity 411, and the process of the limiting part 111 sliding from the second end to the first end of the limiting channel 45 is the exhaust process of the first cavity 411. When the first piston 11 moves to the maximum intake stroke, that is, when the first piston 11 finishes intake, the limiting part 111 abuts against the second end of the limiting channel 45; when the first piston 11 moves to the maximum exhaust stroke, that is, when the first piston 11 finishes exhaust, the limiting part 111 abuts against the first end of the limiting channel 45. The first end of the limiting channel 45 is the top dead center, and the second end of the limiting channel 45 is the bottom dead center.

[0087] Optionally, the length of the limiting channel 45 along its extension direction is 3 / 5L; where L is the length of the cylinder cavity 41.

[0088] Specifically, the limiting part 111 is a strip-shaped structure, and the extending direction of the limiting part 111 is parallel or the same as the length direction of the cylinder cavity 41.

[0089] Optionally, there are multiple limiting channels 45, which are spaced apart circumferentially along the cylinder cavity 41; there are multiple limiting parts 111, which are spaced apart circumferentially along the first piston 11; the multiple limiting parts 111 are arranged one-to-one with the multiple limiting channels 45, and each limiting part 111 is slidably disposed within its corresponding limiting channel 45. Along the extending direction of the limiting channels 45, the first ends of the multiple limiting channels 45 are located at the same position, and the second ends of the multiple limiting channels 45 are located at the same position, so that when the first piston 11 moves to the maximum intake stroke, each limiting part 111 abuts against the second end of the corresponding limiting channel 45; when the first piston 11 moves to the maximum exhaust stroke, each limiting part 111 abuts against the first end of the corresponding limiting channel 45.

[0090] It should be noted that "the first ends of the multiple limiting channels 45 are located at the same position" means that the first end faces of the multiple limiting channels 45 are located on the same plane, and the plane containing the first end faces of the multiple limiting channels 45 is perpendicular to the axial direction of the cylinder cavity 41. "The second ends of the multiple limiting channels 45 are located at the same position" means that the second end faces of the multiple limiting channels 45 are located on the same plane, and the plane containing the second end faces of the multiple limiting channels 45 is perpendicular to the axial direction of the cylinder cavity 41. The axial direction of the cylinder cavity 41 is the same as the length direction of the cylinder cavity 41.

[0091] Figure 5 There are two limiting parts 111 in the middle, and the included angle between the two limiting parts 111 is 180 degrees.

[0092] Specifically, the limiting channel 45 contains lubricating oil to ensure the smooth movement of the first piston 11. That is, the limiting channel 45 has the function of storing oil.

[0093] In this embodiment, to avoid a large volume of cylinder seat 40, the height of the second piston 12 is n times the height of the first piston 11, where n is greater than 1; the height directions of the second piston 12 and the first piston 11 are both parallel to the length direction of the cylinder cavity 41; this saves space occupied by the first piston 11, thereby reducing the volume of cylinder seat 40. Optionally, n = 2.

[0094] In this embodiment, the diameter of the connecting channel 42 is To ensure the lifespan of the second elastic element 51, the outer diameter of the second elastic element 51 is greater than or equal to... and less than or equal to The outer diameter of the sealing part 501 is greater than or equal to This ensures a tight seal on the connecting channel 42 and allows the sealing part 501 to reciprocate within the connecting channel 42.

[0095] In this embodiment, when the sealing element 50 is disposed within the communicating channel 42 and located at a preset position, so that the first cavity 411 and the second cavity 412 are in a disconnected state, the sealing part 501 is located at the preset position to keep the first cavity 411 and the second cavity 412 in a disconnected state; that is, the sealing part 501 is located at the connection between the communicating channel 42 and the first channel 43. At this time, the thickness H of the sealing part 501 must be greater than or equal to the length of the second port of the first channel 43 in the extending direction of the communicating channel 42; when the second port of the first channel 43 is circular, the thickness H of the sealing part 501 must be greater than or equal to the diameter of the second port of the first channel 43 to ensure the sealing of the second port of the first channel 43, thereby ensuring the disconnected state between the first cavity 411 and the second cavity 412; the thickness direction of the sealing part 501 is the same as or parallel to the extending direction of the communicating channel 42.

[0096] In this embodiment, the drive assembly includes a crankshaft 60 and a connecting rod 61. The first end of the connecting rod 61 is rotatably sleeved on the crankshaft 60, and the second end of the connecting rod 61 is connected to the second piston 12 so that when the crankshaft 60 rotates, the connecting rod 61 drives the second piston 12 to reciprocate along the length direction of the cylinder cavity 41.

[0097] Specifically, when the crankshaft 60 rotates once, the second piston 12 performs one cycle of reciprocating motion, and the second chamber 412 performs one intake and one exhaust.

[0098] Specifically, the crankshaft 60 includes an eccentric shaft portion 601, and the first end of the connecting rod 61 is rotatably sleeved on the eccentric shaft portion 601.

[0099] Specifically, the second piston 12 is provided with a through hole and a first pin hole. The through hole extends along the movement direction of the second piston 12, and the first pin hole extends radially along the second piston 12 and communicates with the through hole, i.e., the through hole and the first pin hole are intersecting. The second end of the connecting rod 61 has a second pin hole, which extends radially along the second piston 12. The second end of the connecting rod 61 passes through the through hole to align the first pin hole and the second pin hole. The piston pin 62 passes through the first pin hole and the second pin hole. The positioning pin 63 passes through the piston pin 62 and the second piston 12 along the movement direction of the second piston 12 to lock and fix the second end of the connecting rod 61 and the second piston 12. Optionally, the positioning pin 63 is an elastic positioning pin.

[0100] Specifically, the second piston 12 has a cavity, which includes a portion of the second intake passage and at least a portion of the through hole.

[0101] Specifically, the first piston 11 has a hollow structure to reduce its weight.

[0102] The present invention also provides a compressor comprising a drive assembly and the piston mechanism described above.

[0103] In the specific implementation process, during the operation of the compressor, along with the intake and compression process of the valve plate, the gas in the second chamber 412 mainly relies on the intake valve plate on the second piston 12 to draw gas from the compressor housing, while the gas in the first chamber 411 mainly comes from the intermediate gas that is normally drawn in by the valve group and compressed by the second chamber 412 and discharged into the first chamber 411 through the connecting channel 42.

[0104] Inhalation process: The stroke distance of the first piston 11 is twice that of the second piston 12. Since the stroke distance of the second piston 12 is shorter, when the first piston 11 has completed half of the inhalation, the second piston 12 has already completed the inhalation. The first piston 11 is compressed to the right under the elastic force of the first elastic element 30. The gas in the second chamber 412 is compressed and the pressure is higher than the gas pressure in the shell. The compressed gas begins to exhaust through the connecting channel 42. The sealing element 50 is compressed under pressure. The second chamber 412 and the first chamber 411 are connected. The gas in the second chamber 412 is discharged into the first chamber 411 until the piston finishes inhaling.

[0105] Compression and exhaust process: At the start of compression, the first piston 11 and the second piston 12 begin compression simultaneously. Since the stroke of the second piston 12 is shorter, and some gas has already been discharged into the first chamber 411 during the intake process, the remaining gas is compressed and discharged into the first chamber 411 through the connecting channel 42. When the pressure in the first chamber 411 is higher than that in the second chamber 412, the seal 50 rebounds under pressure, and the seal 50 disconnects the second chamber 412 and the first chamber 411. The gas in the second chamber 412 mixes with the gas in the first chamber 411 and is then compressed and exhausted in the first chamber 411.

[0106] Driven by the second piston 12 and the first elastic element 30, the first piston 11 moves with the rotation of the crankshaft 60. The crankshaft 60 rotates 360 degrees, and the first piston 11 can complete the entire process of intake, compression and exhaust.

[0107] After the gas in the second chamber 412 is discharged into the first chamber 411, the pressure in the first chamber 411 is the intermediate pressure after mixing. The compressor undergoes two stages of compression, which can reduce the power consumption of the compressor and increase the cooling capacity of the compressor.

[0108] The present invention also provides a household appliance comprising the compressor described above. Optionally, the household appliance is a refrigerator.

[0109] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0110] In the piston mechanism provided by the present invention, the piston mechanism includes a cylinder seat 40, a seal 50, and two pistons. The cylinder seat 40 has a cylinder cavity 41 and a communicating channel 42; the communicating channel 42 has a first end and a second end disposed opposite to each other along its extending direction; along the extending direction of the communicating channel 42, the communicating channel 42 has a predetermined portion located between its first end and the second end; the two pistons are spaced apart along the length direction of the cylinder cavity 41 to divide the cylinder cavity 41 into a first cavity portion 411 and a second cavity portion 412; the predetermined portion of the communicating channel 42 communicates with the first cavity portion 411, and the second end of the communicating channel 42 communicates with the second cavity portion 412.

[0111] A sealing element 50 is disposed within the communicating channel 42; along the extending direction of the communicating channel 42, the sealing element 50 is located between a predetermined portion and the second end of the communicating channel 42, or the sealing element 50 is located at a predetermined portion of the communicating channel 42, so that the first cavity 411 and the second cavity 412 are in a disconnected state. The sealing element 50 is elastically connected to the first end of the communicating channel 42, so that the sealing element 50 is extendable and retractable along the extending direction of the communicating channel 42.

[0112] When the pressure in the second cavity 412 is equal to the pressure in the first cavity 411, the seal 50 is in a natural state where it is neither stretched nor compressed. At this time, the seal 50 is located between the preset part and the second end of the connecting channel 42 or at the preset part, and the first cavity 411 and the second cavity 412 are in a disconnected state. When the pressure in the second cavity 412 is greater than the pressure in the first cavity 411, the airflow in the second cavity 412 flows into the connecting channel 42 and exerts a pushing force on the seal 50, causing the seal 50 to move along the direction from the second end to the first end of the connecting channel 42. This causes the seal 50 to move to a preset position between the first end and the connecting channel 42, thereby making the second cavity 412 and the first cavity 411 connected. At this time, the airflow in the second cavity 412 flows into the first cavity 411 through the connecting channel 42. The gas flowing from the second cavity 412 into the first cavity 411 is compressed twice in the first cavity 411. The two-stage compression can effectively improve the cooling capacity of the compressor, thereby solving the problem of low cooling efficiency of the compressor in the prior art.

[0113] By implementing the compressor of this invention, two-stage compression can reduce the compressor pressure ratio, effectively increase the compressor's cooling capacity, reduce the compressor's power consumption, effectively improve the system's energy efficiency ratio, and improve volumetric efficiency through intermediate gas injection, effectively increasing compressor efficiency, saving compressor costs, and the process is simple and easy to install.

[0114] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0115] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0116] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A piston mechanism, characterized in that, include: A cylinder seat (40) has a cylinder cavity (41) and a connecting channel (42); the connecting channel (42) has a first end and a second end disposed opposite to each other along its extending direction; the connecting channel (42) has a predetermined portion located between its first end and the second end; Two pistons are spaced apart along the length of the cylinder cavity (41) to divide the cylinder cavity (41) into a first cavity (411) and a second cavity (412); a predetermined part of the connecting channel (42) is connected to the first cavity (411), and the second end of the connecting channel (42) is connected to the second cavity (412); A sealing element (50) is disposed within the communication channel (42) and located between a predetermined portion and the second end of the communication channel (42) or at the predetermined portion, so that the first cavity (411) and the second cavity (412) are in a disconnected state; the sealing element (50) is elastically connected to the first end of the communication channel (42) so that when the pressure of the second cavity (412) is greater than the pressure of the first cavity (411), the airflow drives the sealing element (50) to move between the predetermined portion and the first end of the communication channel (42), thereby connecting the second cavity (412) and the first cavity (411); The two pistons are elastically connected, and a second cavity (412) is formed between the two pistons, so that the two pistons move closer or further apart under elastic force, thereby increasing or decreasing the pressure in the second cavity (412).

2. The piston mechanism according to claim 1, characterized in that, The piston mechanism further includes a first elastic element (30); along the extension and retraction direction of the first elastic element (30), the first elastic element (30) has a first end and a second end disposed opposite to each other; the first end and the second end of the first elastic element (30) are respectively connected to the two pistons.

3. The piston mechanism according to claim 1, characterized in that, The cylinder cavity (41) has a first end and a second end disposed opposite to each other along its length direction, and the first end of the cylinder cavity (41) is closed. The two pistons are a first piston (11) and a second piston (12), the second piston (12) being located on the side of the first piston (11) away from the first end of the cylinder cavity (41); the first cavity (411) is formed between the first piston (11) and the first end wall of the cylinder cavity (41).

4. The piston mechanism according to claim 3, characterized in that, The second piston (12) is used to connect to the drive assembly; When the drive assembly drives the second piston (12) to move away from the first end of the cylinder cavity (41), the second piston (12) drives the first piston (11) to move. The second cavity (412) draws air from the side of the second piston (12) away from the first piston (11) through the suction valve plate provided on the second piston (12). The first cavity (411) draws air from the outside of the first end wall of the cylinder cavity (41) through the suction valve plate provided on the first end wall of the cylinder cavity (41). After the second cavity (412) finishes drawing air, the first piston (11) continues to move away from the first end of the cylinder cavity (41) under the action of elastic force, so that the airflow in the second cavity (412) flows into the first cavity (411) through the connecting channel (42). When the drive assembly drives the second piston (12) to move toward the first end of the cylinder cavity (41), the second piston (12) moves toward the first piston (11) under elastic force, so that the pressure in the second cavity (412) is greater than the pressure in the first cavity (411), thereby causing the airflow in the second cavity (412) to flow into the first cavity (411), and at the same time, the airflow in the second cavity (412) pushes the first piston (11) to move, so that the gas in the first cavity (411) is discharged to the outside of the first end wall of the cylinder cavity (41) through the exhaust valve plate provided on the first end wall; when the second cavity (412) completes the exhaust, the seal (50) rebounds to the preset position and the second end of the connecting channel (42), and the first piston (11) continues to move toward the first end of the cylinder cavity (41) under the action of elastic force.

5. The piston mechanism according to claim 1, characterized in that, The piston mechanism further includes a second elastic element (51); along the extension and retraction direction of the second elastic element (51), the second elastic element (51) has a first end and a second end disposed opposite to each other; the first end and the second end of the second elastic element (51) are respectively connected to the first end of the communicating channel (42) and the seal (50); and / or There are multiple seals (50) and multiple connecting channels (42). The multiple seals (50) are arranged one-to-one in the multiple connecting channels (42); the multiple connecting channels (42) are arranged at intervals along the circumference of the cylinder cavity (41).

6. The piston mechanism according to claim 3, characterized in that, A limiting channel (45) is provided on the cavity wall of the cylinder cavity (41), and the extending direction of the limiting channel (45) is parallel or the same as the length direction of the cylinder cavity (41). The first piston (11) is provided with a limiting part (111), which is slidably disposed in the limiting channel (45) so as to limit the movement stroke of the first piston (11) by the limiting part (111) abutting against the two ends of the limiting channel (45).

7. The piston mechanism according to claim 6, characterized in that, There are multiple limiting channels (45), and the multiple limiting channels (45) are arranged at intervals along the circumference of the cylinder cavity (41); there are multiple limiting parts (111), and the multiple limiting parts (111) are arranged at intervals along the circumference of the first piston (11); the multiple limiting parts (111) are arranged in a one-to-one correspondence with the multiple limiting channels (45); Each of the limiting channels (45) has a first end and a second end at its two ends, respectively; the first end faces of the multiple limiting channels (45) are located on the same plane, and the plane containing the first end faces of the multiple limiting channels (45) is perpendicular to the length direction of the cylinder cavity (41); the second end faces of the multiple limiting channels (45) are located on the same plane, and the plane containing the second end faces of the multiple limiting channels (45) is perpendicular to the length direction of the cylinder cavity (41).

8. The piston mechanism according to claim 3, characterized in that, The height of the second piston (12) is n times the height of the first piston (11), where n is greater than 1; the height direction of the second piston (12) and the height direction of the first piston (11) are both parallel to the length direction of the cylinder cavity (41).

9. A compressor, characterized in that, The piston mechanism includes any one of claims 1 to 8.

10. A household appliance, characterized in that, Includes the compressor as described in claim 9.

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