Pump body assembly, compressor and household appliance

Abstract

The utility model discloses a pump body assembly, compressor and household appliance, pump body assembly includes crankcase, first piston, with the first piston connection's first connecting rod, second piston, with the second piston connection's second connecting rod, crankshaft, first suction and exhaust mechanism and second suction and exhaust mechanism, and the cylinder of crankcase includes being equipped with first containing chamber, second containing chamber and exhaust silencer chamber, first piston is suitable for reciprocating motion in first containing chamber, second piston is suitable for reciprocating motion in second containing chamber, and the eccentric part of crankshaft is articulated with first connecting rod, second connecting rod, first suction and exhaust mechanism are located one end of first containing chamber and include first exhaust part, and second suction and exhaust mechanism are located one end of second containing chamber and include second exhaust part, and first exhaust part and second exhaust part all are linked together with exhaust silencer chamber, the utility model discloses a pump body assembly can optimize load distribution, improve energy efficiency, improve vibration and noise, improve the stability and reliability of compressor, and extend the life.

Description

Technical Field

[0001] This utility model relates to the field of compressor technology, and in particular to a pump body assembly, a compressor, and a household appliance. Background Technology

[0002] Reciprocating compressors primarily consist of a motor assembly that drives a piston to reciprocate within a cylinder via a crankshaft, thereby compressing the refrigerant and performing work. However, existing reciprocating compressors suffer from significant cylinder loads, making it difficult to fully utilize the motor assembly's output torque, resulting in low energy efficiency. Furthermore, they are prone to vibration and noise at high speeds, impacting compressor stability and lifespan. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pump body assembly that can optimize load distribution, improve energy efficiency, reduce vibration and noise, enhance the stability and reliability of the compressor, and extend its service life.

[0004] This utility model also provides a compressor having the above-described pump body assembly.

[0005] According to a first aspect of the present invention, a pump body assembly includes a crankcase, a main body, and a cylinder located at one end of the main body. The cylinder has a first receiving cavity, a second receiving cavity, and an exhaust muffler cavity. A first piston is adapted to reciprocate within the first receiving cavity. A second piston is adapted to reciprocate within the second receiving cavity. A crankshaft includes an eccentric portion and is rotatably mounted on the main body. A first connecting rod and a second connecting rod are included, one end of the first connecting rod being hinged to the eccentric portion and the other end being connected to the first piston, and one end of the second connecting rod being hinged to the eccentric portion and the other end being connected to the second piston. The first connecting rod and the second connecting rod respectively drive the first piston and the second piston to reciprocate. A first intake and exhaust mechanism is mounted on the cylinder and located at the end of the first receiving cavity opposite to the crankshaft, and the first intake and exhaust mechanism includes a first exhaust portion. A second intake and exhaust mechanism is mounted on the cylinder and located at the end of the second receiving cavity opposite to the crankshaft, and the second intake and exhaust mechanism includes a second exhaust portion. Both the first exhaust portion and the second exhaust portion communicate with the exhaust muffler cavity.

[0006] The pump assembly according to the first aspect of this utility model has at least the following beneficial effects: By providing a first receiving cavity and a second receiving cavity, the crankshaft drives the first piston to reciprocate within the first receiving cavity and drives the second piston to reciprocate within the second receiving cavity, thereby distributing the load between the first and second pistons, resulting in a more balanced load distribution and better balance between the crankshaft, the first piston, and the second piston. This reduces the radial force on the crankshaft, improves vibration, reduces noise, and enhances the stability and extends the service life of the compressor. Furthermore, during the movement of the first and second pistons, one piston can assist the other in moving, fully utilizing the output torque of the crankshaft and improving energy efficiency. Simultaneously, since both the first and second exhaust sections are connected to the exhaust silencer cavity, i.e., the first and second receiving cavities are arranged in parallel, even if one piston fails, the other piston can still operate normally, ensuring compressor operation and improving reliability.

[0007] According to some embodiments of the present invention, the first receiving cavity and the second receiving cavity are arranged symmetrically about the rotation axis of the crankshaft.

[0008] According to some embodiments of the present invention, the first receiving cavity includes a compression cavity located on the side of the first piston facing the first intake and exhaust mechanism. The first intake and exhaust mechanism further includes a first intake part. The cylinder body is provided with an intake channel. The intake channel includes a first connection port and a second connection port located at both ends. The second connection port communicates with the first intake part. The first connection port is located on the inner peripheral wall of the first receiving cavity. The first piston can expose the first connection port in the compression cavity so that the intake channel communicates with the compression cavity, or block the intake channel from the compression cavity.

[0009] According to some embodiments of the present invention, the air intake channel includes a first air intake section and a second air intake section. The first air intake section is arranged along the central axis of the first accommodating cavity. The two ends of the second air intake section pass through the inner peripheral wall of the first accommodating cavity and the outer peripheral wall of the cylinder, respectively. One end of the first air intake section extends to the end face of the cylinder facing the first air intake and exhaust mechanism, and the other end communicates with the second air intake section.

[0010] According to some embodiments of the present invention, the pump body assembly further includes a sealing member, the sealing member having a through hole, the sealing member being installed at the end of the second intake section opposite to the first receiving cavity, and the through hole connecting the second intake section with the external space of the cylinder body.

[0011] According to some embodiments of the present invention, the air intake channel is arranged obliquely relative to the central axis of the first accommodating cavity, and one end of the air intake channel extends to the inner peripheral wall of the first accommodating cavity, and the other end extends to the end face of the cylinder facing the first air intake and exhaust mechanism.

[0012] According to some embodiments of the present invention, the pump body assembly further includes a heat insulation sleeve, which is installed on the inner peripheral wall of the air intake channel.

[0013] According to some embodiments of the present invention, the first intake and exhaust mechanism includes a valve plate, an end cover, and an exhaust valve. The valve plate is installed on the cylinder body and located at one end of the first receiving cavity away from the crankshaft. The end cover is installed on the side of the valve plate away from the cylinder body. The valve plate has a first exhaust hole communicating with the first receiving cavity. The end cover has an exhaust cavity. The exhaust valve includes a valve core movably installed on the end cover. The valve core is used to close the first exhaust hole or to allow the exhaust cavity to communicate with the first receiving cavity through the first exhaust hole.

[0014] According to some embodiments of the present invention, the exhaust valve further includes an elastic element, which is installed on the end cap and connected to the valve core to drive the valve core to close the first exhaust port.

[0015] According to some embodiments of the present invention, the first connecting rod includes a first connecting ring and a first support portion. The first support portion is connected to the outer periphery of the first connecting ring and extends toward one axial end of the first connecting ring. The second connecting rod includes a second connecting ring and a second support portion. The second support portion is connected to the outer periphery of the second connecting ring and extends toward one axial end of the second connecting ring. Both the first connecting ring and the second connecting ring are sleeved on the eccentric portion. The first support portion abuts against the outer peripheral wall of the second connecting ring, and the second support portion abuts against the outer peripheral wall of the first connecting ring.

[0016] The compressor according to a second aspect of the present invention includes a housing, a drive assembly, and a pump assembly according to a first aspect of the present invention. The pump assembly and the drive assembly are both installed inside the housing, and the drive assembly is connected to the crankshaft to drive the crankshaft to rotate.

[0017] The compressor according to the second aspect of this utility model has at least the following beneficial effects: Because the compressor uses the aforementioned pump assembly, and by providing a first receiving cavity and a second receiving cavity, the crankshaft drives the first piston to reciprocate within the first receiving cavity and the second piston to reciprocate within the second receiving cavity. This allows for a more balanced load distribution between the first and second pistons, resulting in better balance between the crankshaft, the first piston, and the second piston. It also reduces the radial force on the crankshaft, improves vibration, reduces noise, and enhances the compressor's stability and extends its service life. Furthermore, during the movement of the first and second pistons, one piston can assist the other in moving, fully utilizing the crankshaft's output torque and improving energy efficiency. Simultaneously, since both the first and second exhaust sections are connected to the exhaust silencer cavity (i.e., the first and second receiving cavities are arranged in parallel), even if one piston fails, the other piston can still operate normally, ensuring compressor operation and improving reliability.

[0018] The household appliance according to a third aspect of the present invention includes the compressor of the second aspect of the present invention.

[0019] The household appliance according to the third aspect of this utility model has at least the following beneficial effects: Because the household appliance uses the aforementioned compressor, by setting up a first receiving cavity and a second receiving cavity, the crankshaft drives the first piston to reciprocate within the first receiving cavity and drives the second piston to reciprocate within the second receiving cavity, thereby distributing the load between the first and second pistons, resulting in a more balanced load distribution and better balance between the crankshaft, the first piston, and the second piston. This reduces the radial force on the crankshaft, improves vibration and reduces noise, and helps improve the stability and extend the service life of the compressor. Furthermore, during the movement of the first and second pistons, one piston can assist the other piston in moving, fully utilizing the output torque of the crankshaft and improving energy efficiency. Simultaneously, since both the first and second exhaust sections are connected to the exhaust silencer cavity, i.e., the first and second receiving cavities are arranged in parallel, even if one piston fails, the other piston can still operate normally, ensuring compressor operation and improving reliability.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a schematic diagram of the internal structure of the compressor in an embodiment of this utility model;

[0023] Figure 2 This is a partial cross-sectional view of the compressor in an embodiment of this utility model;

[0024] Figure 3 yes Figure 2 Enlarged view of point A in the image;

[0025] Figure 4 yes Figure 3 Enlarged view of point B in the image;

[0026] Figure 5 This is a partial cross-sectional view of the pump body assembly when the first piston moves to the bottom dead center in an embodiment of this utility model;

[0027] Figure 6 This is a schematic diagram of the crankcase in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the end cap structure in an embodiment of this utility model;

[0029] Figure 8 This is a schematic diagram of the valve plate structure in an embodiment of this utility model;

[0030] Figure 9 This is a partial sectional view of the cylinder body in another embodiment of the present invention;

[0031] Figure 10 This is a partial sectional view of the cylinder body in another embodiment of this utility model;

[0032] Figure 11 This is a partial structural schematic diagram of the pump body assembly in an embodiment of this utility model.

[0033] Figure label:

[0034] Casing 1000;

[0035] Crankcase 100; Body 110; Cylinder block 120; First receiving cavity 121; Cylinder wall 122; Intake passage 123; First intake section 1231; Second intake section 1232; First connection port 1233; Second connection port 1234; Exhaust passage 124; First gasket 125; Second gasket 126; Compression cavity 127; Exhaust muffler cavity 128; Second receiving cavity 129;

[0036] First piston 200; first connecting rod 210; first connecting ring 211; first support part 212;

[0037] Second piston 300; second connecting rod 310; second connecting ring 311; second support part 312;

[0038] First intake and exhaust mechanism 400; valve plate 410; first exhaust hole 411; first sealing wall 4111; intake hole 412; second exhaust hole 413; exhaust valve 420; valve core 421; second sealing wall 4211; elastic element 422; end cap 430; exhaust chamber 431; mounting part 432; mounting cavity 4321; partition plate 433; intake chamber 434;

[0039] 500mm plug; 510mm through hole;

[0040] 600mm heat insulation sleeve;

[0041] Second intake and exhaust mechanism 700;

[0042] 800 intake silencer;

[0043] Drive assembly 900; stator 910; rotor 920; crankshaft 930; turntable 931; eccentric part 932; planar thrust bearing 940. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0045] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0047] In the description of this utility model, unless otherwise explicitly defined, terms such as setting, installing, connecting, assembling, and cooperating should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0048] Reference Figures 1 to 11As shown, the first aspect of this utility model provides a pump body assembly, which is applied to the compressor of a household appliance, such as a refrigerator, air conditioner, or water dispenser, and is used to compress refrigerant to perform work.

[0049] The following section uses the refrigerator compressor as an example to explain the specific structure of the pump assembly in detail.

[0050] Reference Figure 1 As shown, the compressor here is a reciprocating compressor, comprising a housing 1000, a drive assembly 900, and a pump assembly. The housing 1000 serves as the main mounting structure for the compressor, providing support and connection for components such as the drive assembly 900 and the pump assembly, thus enabling the installation and positioning of each component. Specifically, both the pump assembly and the drive assembly 900 are installed within the housing 1000.

[0051] Reference Figure 1 , Figure 2 and Figure 6 As shown, it can be understood that the pump body assembly includes a crankcase 100, a first piston 200, a first connecting rod 210, a second piston 300, a second connecting rod 310, a crankshaft 930, a first intake and exhaust mechanism 400, and a second intake and exhaust mechanism 700. The crankcase 100 includes a body portion 110 and a cylinder block 120. A shaft hole is provided in the middle of the body portion 110, and the shaft hole penetrates the upper end face and the lower end face of the body portion 110 in the vertical direction. The cylinder body 120 is connected to the upper end of the main body 110. The cylinder body 120 is provided with a first receiving cavity 121, a second receiving cavity 129, and an exhaust muffler cavity 128. The first receiving cavity 121 and the second receiving cavity 129 are respectively located on the radially outer side of the shaft hole of the main body 110 and are arranged circumferentially at intervals along the shaft hole. The first receiving cavity 121 and the second receiving cavity 129 are cavity structures that penetrate radially along the shaft hole. Generally speaking, the cross-section of the first receiving cavity 121 and the second receiving cavity 129 is circular. Both the first receiving cavity 121 and the second receiving cavity 129 have a central axis arranged radially along the shaft hole. The exhaust muffler cavity 128 is located on one side of the first receiving cavity 121. Of course, the exhaust muffler cavity 128 can also be located on one side of the second receiving cavity 129. Here, the radial direction of the shaft hole is the direction perpendicular to the vertical direction (or the axis of the shaft hole) and pointing from the axis of the shaft hole to the inner circumferential wall of the shaft hole and the reverse direction.

[0052] Reference Figure 2 and Figure 6As shown, it can be understood that the first piston 200 and the second piston 300 are generally cylindrical, and the outer diameter of the first piston 200 matches the inner diameter of the first receiving cavity 121, while the outer diameter of the second piston 300 matches the inner diameter of the second receiving cavity 129. The first piston 200 is movably mounted in the first receiving cavity 121 along the central axis of the first receiving cavity 121, meaning that the first piston 200 can reciprocate within the first receiving cavity 121 along the central axis of the first receiving cavity 121. Similarly, the second piston 300 is movably mounted in the second receiving cavity 129 along the central axis of the second receiving cavity 129, meaning that the second piston 300 can reciprocate within the second receiving cavity 129 along the central axis of the second receiving cavity 129.

[0053] Reference Figure 2 As shown, it can be understood that the crankshaft 930 is arranged vertically and passes through the shaft hole. The crankshaft 930 is rotatably engaged with the body portion 110, and the upper end of the crankshaft 930 protrudes from the upper end face of the body portion 110. Generally, the crankshaft 930 includes a turntable 931 located above the body portion 110. The turntable 931 is connected to the body portion 110 via a planar thrust bearing 940 to provide upward support force to the crankshaft 930 while ensuring the rotational stability of the crankshaft 930.

[0054] The crankshaft 930 also includes an eccentric portion 932 connected to the upper end face of the turntable 931, the eccentric portion 932 being offset from the rotation axis of the crankshaft 930. One end of the first connecting rod 210 is hinged to the eccentric portion 932, and the other end is hinged to the first piston 200. Similarly, one end of the second connecting rod 310 is hinged to the eccentric portion 932, and the other end is hinged to the second piston 300. The hinge axes between the first connecting rod 210 and the eccentric portion 932, between the first connecting rod 210 and the first piston 200, between the second connecting rod 310 and the eccentric portion 932, and between the second connecting rod 310 and the second piston 300 are all arranged in the vertical direction. Therefore, when the crankshaft 930 rotates, the first piston 200 can be driven to reciprocate within the first receiving cavity 121 via the first connecting rod 210, and simultaneously, the second piston 300 can be driven to reciprocate within the second receiving cavity 129 via the second connecting rod 310.

[0055] Reference Figure 11As shown, it can be understood that the first connecting rod 210 includes a first connecting ring 211 and a first support portion 212, wherein the first support portion 212 is connected to the outer periphery of the first connecting ring 211 and extends toward one axial end of the first connecting ring 211. Similarly, the second connecting rod 310 includes a second connecting ring 311 and a second support portion 312, wherein the second support portion 312 is connected to the outer periphery of the second connecting ring 311 and extends toward one axial end of the second connecting ring 311. Both the first connecting ring 211 and the second connecting ring 311 are sleeved on the eccentric portion 932, thereby achieving a hinge connection between the first connecting rod 210 and the eccentric portion 932, and a hinge connection between the second connecting rod 210 and the eccentric portion 932. The first support portion 212 and the second bearing portion extend in opposite directions, and the first support portion 212 abuts against the outer peripheral wall of the second connecting ring 311, and the second support portion 312 abuts against the outer peripheral wall of the first connecting ring 211. Therefore, during the reciprocating motion of the first piston 200 and the second piston 300 driven by the crankshaft 930, the first support part 212 can provide support for the second connecting ring 311, and the second support part 312 can provide support for the first connecting ring 211, so that the first connecting rod 210 and the second connecting rod 310 support each other in the radial direction of the crankshaft 930, reducing the radial impact of the first connecting rod 210 and the second connecting rod 310 on the crankshaft 930 and effectively improving vibration.

[0056] Reference Figure 2 As shown, it can be understood that the first intake and exhaust mechanism 400 is installed on the cylinder block 120 and located at the end of the first receiving cavity 121 opposite to the crankshaft 930. The first intake and exhaust mechanism 400 is used to realize the intake and exhaust of the first receiving cavity 121. Specifically, the first intake and exhaust mechanism 400 includes a first exhaust section and a first intake section, wherein the first exhaust section is used to discharge the compressed refrigerant in the first receiving cavity 121, and the first intake section is used to draw low-pressure refrigerant into the first receiving cavity 121.

[0057] Similarly, the second intake and exhaust mechanism 700 is installed on the cylinder block 120 and located at the end of the second receiving cavity 129 opposite to the crankshaft 930. The second intake and exhaust mechanism 700 is used to realize the intake and exhaust of the second receiving cavity 129. Specifically, the second intake and exhaust mechanism 700 includes a second exhaust section and a second intake section, wherein the second exhaust section is used to discharge the compressed refrigerant in the second receiving cavity 129, and the second intake section is used to draw low-pressure refrigerant into the second receiving cavity 129.

[0058] Reference Figure 1 and Figure 2As shown, the first and second intake sections are independent and each supplies low-pressure refrigerant, while the first and second exhaust sections are connected to the high-pressure silencer. Therefore, the first receiving cavity 121 and the second receiving cavity 129 are arranged in parallel. Consequently, the compressed refrigerant in the first and second receiving cavities 121 and 129 enters the exhaust silencer cavity 128 sequentially, reducing airflow fluctuations and improving airflow delivery stability.

[0059] Reference Figure 2 As shown, the drive assembly 900 includes a stator 910 and a rotor 920. The stator 910 is fixedly mounted on the lower end of the body portion 110 of the crankcase 100, and the lower end of the assembly of the crankcase 100 and the stator 910 is connected to the housing 1000 by four support springs. The four support springs are arranged at equal intervals along the circumference of the stator 910. Thus, the impact of the crankcase 100 on the housing 1000 can be reduced by the support springs, achieving vibration damping, which helps to reduce the operating noise of the compressor and improve the installation stability of the compressor.

[0060] The stator 910 has an inner hole arranged in the vertical direction, the axis of the inner hole coincides with the axis of the shaft hole, the rotor 920 is rotatably installed in the inner hole of the stator 910 and fixedly connected to the crankshaft 930, and the lower end of the crankshaft 930 protrudes from the lower end face of the rotor 920.

[0061] Therefore, under the combined action of the stator 910 and the rotor 920, the rotor 920 can be driven to rotate, and the rotor 920 drives the crankshaft 930 to rotate. The crankshaft 930 drives the first piston 200 to reciprocate within the first receiving cavity 121 via the first connecting rod 210, so as to compress the refrigerant and do work within the first receiving cavity 121. At the same time, the second piston 300 is driven to reciprocate within the second receiving cavity 129 via the second connecting rod 310, so as to compress the refrigerant and do work within the first receiving cavity 121.

[0062] Therefore, by setting up the first receiving cavity 121 and the second receiving cavity 129, the crankshaft 930 drives the first piston 200 to reciprocate within the first receiving cavity 121 and the second piston 300 to reciprocate within the second receiving cavity 129. This allows the load to be distributed between the first piston 200 and the second piston 300, resulting in a more balanced load distribution. This fully utilizes the output torque of the drive assembly 900, improving energy efficiency. Furthermore, it improves the balance between the crankshaft 930, the first piston 200, and the second piston 300, reducing the radial force on the crankshaft 930, improving vibration and reducing noise, thus enhancing the compressor's stability and extending its service life. In addition, during the movement of the first piston 200 and the second piston 300, one piston can assist the other in moving, fully utilizing the output torque of the crankshaft 930 and improving energy efficiency. Simultaneously, since the first receiving cavity 121 and the second receiving cavity 129 are arranged in parallel, even if one piston fails, the other piston can still operate normally, ensuring compressor operation and improving reliability.

[0063] Reference Figure 2 As shown, it can be understood that in this embodiment, the first receiving cavity 121 and the second receiving cavity 129 are arranged symmetrically about the rotation axis of the crankshaft 930. Therefore, when the crankshaft 930 rotates, the first piston 200 and the second piston 300 move in the same direction. For example, when the first piston 200 performs the compression stroke, the second piston 300 performs the expansion stroke, providing a certain force to the movement of the first piston 200. In this way, the radial force on the crankshaft 930 can be minimized, vibration can be improved, and noise can be reduced. At the same time, under the same rotational speed, the displacement of the compressor can be increased. Or, under the same displacement, the rated power and peak torque of the drive assembly 900 (i.e., the motor) can be reduced. In this embodiment, under the same displacement, the rated power of the drive assembly 900 (i.e., the motor) can be reduced by 33% and the peak torque can be reduced by 50%.

[0064] The following detailed description will be based on the connection structure between the first receiving cavity 121 and the first intake and exhaust mechanism 400, and the structural composition of the first intake and exhaust mechanism 400.

[0065] It is readily understood that the connection structure between the first receiving cavity 121 and the first suction / exhaust mechanism 400, and the connection structure between the second receiving cavity 129 and the second suction / exhaust mechanism 700, can be one of the structural forms described below, or both of the structural forms described below. Similarly, the structural composition of the first suction / exhaust mechanism 400 and the structural composition of the second suction / exhaust mechanism 700 can also be one of the structural compositions described below, or both of the structural compositions described below.

[0066] Reference Figure 3 , Figure 7 and Figure 8 As shown, the first intake and exhaust mechanism 400 includes a valve plate 410, an end cap 430, and an exhaust valve 420. Specifically, the valve plate 410 is fixedly mounted on the cylinder block 120 and located on the side of the first receiving cavity 121 opposite to the crankshaft 930 along the central axis of the first receiving cavity 121, and the valve plate 410 covers the opening of the end of the first receiving cavity 121 opposite to the crankshaft 930. The valve plate 410 is provided with a first exhaust port 411 and an intake port 412. The first exhaust port 411 communicates with the first receiving cavity 121, that is, the first exhaust port 411 is located within the range surrounded by the projection of the inner peripheral wall of the first receiving cavity 121 onto the valve plate 410. The intake port 412 is staggered from the first receiving cavity 121 in a direction perpendicular to the central axis of the first receiving cavity 121, that is, the intake port 412 is located outside the range surrounded by the projection of the inner peripheral wall of the first receiving cavity 121 onto the valve plate 410.

[0067] It is understood that the first receiving cavity 121 includes a compression cavity 127 located between the valve plate 410 and the first piston 200. The compression cavity 127 is a space for compressing the refrigerant, and its volume is variable during compressor operation. That is, the first exhaust port 411 is connected to the compression cavity 127.

[0068] The end cap 430 is fixedly installed on the side of the valve plate 410 facing away from the cylinder body 120. For example, the end cap 430, the valve plate 410, and the cylinder body 120 are fastened together by bolts. The end cap 430 is generally a cover structure with its opening facing the valve plate 410. Specifically, a partition 433 is provided inside the end cap 430. The partition 433 is generally U-shaped and divides the internal cavity of the end cap 430 into an exhaust chamber 431 and an intake chamber 434. The exhaust chamber 431 is located on the outer side of the U-shaped partition 433 along its thickness direction, and the intake chamber 434 is located on the inner side of the U-shaped partition 433 along its thickness direction. The exhaust chamber 431 communicates with the first exhaust port 411, allowing the exhaust chamber 431 to communicate with the compression chamber 127, while the intake chamber 434 communicates with the intake port 412.

[0069] Reference Figure 2 As shown, the first intake and exhaust mechanism 400 also includes an intake muffler 800, which is installed in the intake chamber 434 of the end cover 430 and is connected to the intake port 412. During intake, the refrigerant enters through the intake muffler 800, effectively reducing aerodynamic noise during refrigerant flow. The combination of the intake muffler 800, the intake chamber 434, and the intake port 412 constitutes the first intake section.

[0070] Reference Figure 6 and Figure 8As shown, it can be understood that the valve plate 410 is also provided with a second vent 413, which is located outside the area surrounded by the projection of the inner peripheral wall of the first receiving cavity 121 onto the valve plate 410.

[0071] Reference Figure 6 As shown, the cylinder body 120 has a cylinder wall 122, which is the wall located on the outer periphery of the first receiving cavity 121, and the cylinder wall 122 is arranged around the central axis of the first receiving cavity 121. It is easy to understand that the cylinder wall 122 has a certain thickness along the radial direction of the first receiving cavity 121. Correspondingly, the cylinder wall 122 is provided with an exhaust channel 124, and the two ends of the second exhaust port 413 are respectively connected to the exhaust cavity 431 and the exhaust channel 124. The combination of the first exhaust port 411, the exhaust cavity 431, the second exhaust port 413, and the exhaust channel 124 constitutes the first exhaust section. The exhaust channel 124 is connected to the exhaust silencer 128. Therefore, during the exhaust process, the high-temperature and high-pressure refrigerant is discharged sequentially through the first exhaust port 411, the exhaust cavity 431, the second exhaust port 413, and the exhaust channel 124 to the exhaust silencer 128, where it is silenced before being supplied to the external refrigeration system of the compressor, reducing operating noise.

[0072] It is understandable that the second exhaust port 413 and the first exhaust port 411 are located on the same side of the vertical plane Z passing through the central axis of the first receiving cavity 121, which can shorten the distance between the first exhaust port 411 and the second exhaust port 413, that is, shorten the exhaust path, reduce exhaust resistance, and help improve exhaust efficiency.

[0073] Reference Figure 4 As shown, it can be understood that, in order to improve the sealing between the end cap 430, the valve plate 410, and the cylinder body 120, a first gasket 125 is typically sandwiched between the valve plate 410 and the cylinder body 120, and a second gasket 126 is sandwiched between the end cap 430 and the valve plate 410 to prevent air leakage. It is easy to understand that the first gasket 125 has holes corresponding to the first receiving cavity 121, the exhaust channel 124, the first exhaust hole 411, the second exhaust hole 413, and the intake hole 412, and the second gasket 126 has holes corresponding to the first exhaust hole 411, the second exhaust hole 413, and the intake hole 412.

[0074] Reference Figure 3As shown, it can be understood that the end of the first piston 200 closest to the valve plate 410 is defined as the first end, and the end away from the valve plate 410 is defined as the second end. It is easy to understand that the first piston 200 has a top dead center (TDC) P and a bottom dead center (BDC) Q during its stroke. TDC P is closer to the valve plate 410, and BDC Q is farther from the valve plate 410. TDC P is the position of the first end of the first piston 200 within the first receiving cavity 121 when the first piston 200 moves to its furthest point from the rotation axis of the crankshaft 930. BDC Q is the position of the first end of the first piston 200 within the first receiving cavity 121 when the first piston 200 moves to its closest point to the rotation axis of the crankshaft 930. That is, the distance between TDC P and BDC Q in the direction of movement of the first piston 200 is the stroke of the first piston 200. During the reciprocating movement of the first piston 200, the compressor can complete a working cycle of four strokes: expansion, intake, compression, and exhaust. The radial direction of the first receiving cavity 121 is perpendicular to the central axis of the first receiving cavity 121 and extends from the central axis of the first receiving cavity 121 to the inner peripheral wall of the first receiving cavity 121, and in the opposite direction.

[0075] Reference Figure 3 and Figure 4 As shown, it can be understood that the exhaust valve 420 is a one-way valve structure. The exhaust valve 420 is mounted on the end cap 430 and is used to open the first exhaust port 411 or to allow the exhaust chamber 431 to communicate with the compression chamber 127 through the first exhaust port 411. The exhaust valve 420 only allows fluid to flow from the compression chamber 127 to the exhaust chamber 431. It is easy to understand that during the intake, compression, and expansion strokes, the exhaust valve 420 can close the first exhaust port 411, and during the exhaust stroke, the exhaust valve 420 can open the first exhaust port 411 to allow the refrigerant to be discharged from the compression chamber 127 to the exhaust chamber 431.

[0076] Reference Figure 3 and Figure 5 As shown, it can be understood that the cylinder wall 122 is provided with an intake channel 123, which is located on the lower side of the first receiving cavity 121. The openings at both ends of the intake channel 123 are defined as a first connection port 1233 and a second connection port 1234, respectively. The second connection port 1234 is located on the end face of the cylinder body 120 facing the valve plate 410, and the second connection port 1234 is arranged correspondingly to the intake hole 412 in the direction of the central axis of the first receiving cavity 121. The second connection port 1234 communicates with the intake hole 412. Since the intake muffler 800 is installed in the intake chamber 434 of the end cover 430, by setting the intake hole 412 on the valve plate 410 and setting the second connection port 1234 on the end face of the cylinder 120 facing the valve plate 410, the intake muffler 800 can communicate with the intake channel 123 through the intake hole 412, which can reduce the modification of the installation structure of the intake muffler 800 and help reduce costs.

[0077] Of course, it is understandable that in some other embodiments, the second connection port 1234 may be located on the outer peripheral wall of the cylinder body 120, and the valve plate 410 may not have an intake port 412. In this case, the first intake part serves as the outlet of the intake muffler 800. The intake muffler 800 may be installed on the outer peripheral wall of the cylinder body 120 so that the outlet of the intake muffler 800 is directly connected to the second connection port 1234; or the intake muffler 800 may be installed below the end cover 430, and the outlet of the intake muffler 800 may be connected to the second connection port 1234 via an air pipe to achieve intake.

[0078] The first connection port 1233 is located on the side of the top dead center P facing the bottom dead center Q. For example, the first connection port 1233 is located between the top dead center P and the bottom dead center Q; or a part of the first connection port 1233 is located between the top dead center P and the bottom dead center Q, and another part is located on the side of the bottom dead center Q away from the top dead center P. That is, at this time, the bottom dead center Q is within the range of the first connection port 1233 in the moving direction of the first piston 200. In other words, the bottom dead center Q is located between the two ends of the first connection port 1233 along the moving direction of the first piston 200.

[0079] Therefore, when the first piston 200 is at the bottom dead center Q, at least a portion of the first connection port 1233 is exposed in the compression chamber 127, so that the intake passage 123 is connected to the compression chamber 127 for intake, i.e., the refrigerant is drawn into the compression chamber 127. It is easy to understand that during the process of the first piston 200 moving from the lower dead center Q to the upper dead center P, when the first end of the first piston 200 passes the first connection port 1233, the outer peripheral wall of the first piston 200 covers the first connection port 1233, thus blocking the intake channel 123 from the compression chamber 127. As the first piston 200 moves further to the upper dead center P, the outer peripheral wall of the first piston 200 always covers the first connection port 1233. Alternatively, when the second end of the first piston 200 also passes the first connection port 1233, the first connection port 1233 is exposed in the cavity of the first receiving cavity 121 located on the side of the first piston 200 away from the compression chamber 127. At this time, the intake channel 123 and the compression chamber 127 are also blocked.

[0080] In this embodiment, the first connection port 1233 is located between the top dead center P and the bottom dead center Q, and the first connection port 1233 is closer to the bottom dead center Q. Specifically, the end of the first connection port 1233 facing away from the valve plate 410 is arranged radially corresponding to the bottom dead center Q in the first receiving cavity 121. At this time, when the first piston 200 moves from the top dead center P to the bottom dead center Q, the first connection port 1233 is fully exposed in the compression cavity 127, so that the refrigerant in the suction cavity 434 enters the compression cavity 127 through the suction channel 123 to achieve rapid suction. That is to say, during the suction stroke of the first piston 200, the first connection port 1233 is exposed in the compression cavity 127. When the first piston 200 moves from the bottom dead center Q to the top dead center P, and the first end of the first piston 200 just passes the first connection port 1233, the outer peripheral wall of the first piston 200 covers the first connection port 1233, and the intake passage 123 is blocked from the compression chamber 127, so as to compress and exhaust the refrigerant in the compression chamber 127. That is to say, during the compression stroke of the first piston 200, the first connection port 1233 is covered by the first piston 200.

[0081] Of course, it is understood that in some other embodiments, the lower dead center Q may be located within the range of the first connection port 1233 in the direction of movement of the first piston 200, that is, the lower dead center Q is located between the two ends of the first connection port 1233 along the direction of movement of the first piston 200. Therefore, when the first piston 200 is at the lower dead center Q, a portion of the first connection port 123 is exposed in the compression chamber 127, thereby allowing the intake passage 123 to communicate with the compression chamber 127 for intake.

[0082] It is understandable that the inhalation channel 123 can be formed by connecting multiple channels at angles to each other in sequence, or the inhalation channel 123 can be formed by a straight channel.

[0083] When the first piston 200 moves from top dead center P to bottom dead center Q, the exhaust valve 420 closes the first exhaust port 411, the volume of the compression chamber 127 increases, and the air pressure decreases, which is the expansion stroke. When a portion of the first connection port 1233 is exposed in the compression chamber 127, the intake passage 123 connects to the compression chamber 127, and the intake stroke begins. Since the air pressure in the compression chamber 127 is lower than the pressure of the low-pressure refrigerant, the low-pressure refrigerant is drawn into the compression chamber 127 through the intake passage 123, which is the intake stroke. During this time, the first exhaust port 411 remains closed. When the first piston 200 moves to the bottom dead center Q, the first connection port 1233 is fully exposed in the compression chamber 127 for rapid intake, until the air pressure in the compression chamber 127 equals the pressure of the low-pressure refrigerant, at which point the intake stroke ends. In other words, during the intake stroke, at least a portion of the first connection port 1233 is exposed in the compression chamber 127. After the first piston 200 moves to the bottom dead center Q, it moves from Q to the top dead center P. When the first end of the first piston 200 just passes the first connection port 1233, the outer peripheral wall of the first piston 200 covers the first connection port 1233, and the first connection port 1233 is closed. At this time, the first exhaust port 411 remains closed, and the compression chamber 127 is a sealed space. As the first piston 200 moves further to the top dead center P, the volume of the compression chamber 127 decreases, and the low-pressure refrigerant in the compression chamber 127 is compressed into a high-temperature, high-pressure refrigerant, which is the compression stroke. In other words, during the compression stroke, the intake passage 123123 and the compression chamber 127127 are blocked. When the air pressure in the compression chamber 127 is high enough, the exhaust valve 420 opens the first exhaust port 411, and the high-temperature, high-pressure refrigerant is discharged into the exhaust chamber 431 through the first exhaust port 411, which is the exhaust stroke. The exhaust stroke ends when the first piston 200 moves to the top dead center P, and the exhaust valve 420 closes the first exhaust port 411. Then the first piston 200 moves from the top dead center P to the bottom dead center Q, and so on, thus compressing the low-pressure refrigerant into a high-temperature, high-pressure refrigerant for use in the refrigeration system.

[0084] Therefore, during compressor operation, the reciprocating movement of the first piston 200 controls the opening and closing of the suction passage 123 and the compression chamber 127, thereby controlling the suction process. No suction valve is required, and suction can be reliably controlled regardless of whether the compressor is operating at low or high speeds. This addresses the performance and reliability requirements of the suction structure at both low and high speeds, improving the reliability of the suction process. Furthermore, the elimination of suction valves during operation reduces aerodynamic noise, effectively lowering the compressor's operating noise.

[0085] Reference Figure 3As shown, the intake channel 123 includes a first intake section 1231 and a second intake section 1232. Specifically, the first intake section 1231 and the second intake section 1232 are interconnected. The first intake section 1231 is arranged along the central axis of the first receiving cavity 121, that is, along the moving direction of the first piston 200, and the minimum inner diameter of the first intake section 1231 is greater than or equal to 1 mm. The second intake section 1232 is arranged radially along the first receiving cavity 121, that is, along a direction perpendicular to the moving direction of the first piston 200, and the second intake section 1232 is located at the end of the first intake section 1231 facing the shaft hole. Since the intake channel 123 is located on the lower side of the first receiving cavity 121, the second intake section 1232 is arranged in a vertical direction. One end of the first intake section 1231 extends to the end face of the cylinder 120 facing the valve plate 410, and a second connection port 1234 is formed at the end face of the cylinder 120 facing the valve plate 410. The other end of the first intake section 1231 extends to and communicates with the second intake section 1232. One end of the second intake section 1232 facing the central axis of the first receiving cavity 121 extends to the inner peripheral wall of the first receiving cavity 121, and a first connection port 1233 is formed at the inner peripheral wall of the first receiving cavity 121. That is, the intake channel 123 consists of two mutually perpendicular intake sections, so that the refrigerant can enter the compression cavity 127 from the inner peripheral wall of the first receiving cavity 121, so that the opening and closing of the intake channel 123 and the compression cavity 127 can be controlled by the first piston 200, thereby controlling the intake process and improving the reliability of the intake process.

[0086] Of course, the first intake section 1231 is arranged along the central axis of the first receiving cavity 121, and the second intake section 1232 can be arranged at an angle relative to the central axis of the first receiving cavity 121.

[0087] Reference Figure 3 As shown, it can be understood that the end of the second intake section 1232 opposite to the central axis of the first receiving cavity 121 extends to the outer peripheral wall of the cylinder 120. That is, both ends of the second intake section 1232 penetrate the inner peripheral wall of the first receiving cavity 121 and the outer peripheral wall of the cylinder 120, respectively, and make the second intake section 1232 communicate with the external space of the cylinder 120. The external space of the cylinder 120 is the space inside the housing 1000 located outside the cylinder 120. Therefore, during the intake process, in addition to the low-pressure refrigerant drawn in from the intake muffler 800 being sequentially drawn into the compression chamber 127 through the first intake section 1231 and the second intake section 1232, a small amount of low-pressure refrigerant located in the external space of the cylinder 120 can also be directly drawn into the compression chamber 127 through the second intake section 1232, thereby increasing the intake volume of the compressor and improving the working efficiency of the compressor.

[0088] Furthermore, since the second intake section 1232 penetrates the inner peripheral wall of the first receiving cavity 121 and the outer peripheral wall of the cylinder 120, when machining the intake channel 123, the second intake section 1232 can be obtained by directly drilling a hole from the outside of the cylinder 120 along the radial direction of the first receiving cavity 121, and the first intake section 1231 can be obtained by drilling a hole from the end face of the cylinder 120 along the direction of the central axis of the first receiving cavity 121 to the second intake section 1232, which is convenient for machining.

[0089] Since the second intake section 1232 penetrates the inner peripheral wall of the first receiving cavity 121 and the outer peripheral wall of the cylinder 120, the lubricating oil located in the first receiving cavity 121 and used to provide lubrication and heat dissipation for the movement of the first piston 200 will flow out from the second intake section 1232, resulting in a reduction in the amount of lubricating oil, increased wear on the first piston 200 and the cylinder 120, and affecting the life of the compressor.

[0090] Therefore, referring to Figure 3 As shown, the pump body assembly also includes a sealing element 500, which is fixedly installed at the end of the second intake section 1232 away from the first receiving cavity 121. For example, the sealing element 500 is interference-fitted with the cylinder wall 122, or the sealing element 500 is threaded to the cylinder wall 122, or the sealing element 500 is welded to the cylinder wall 122, etc. The sealing element 500 is also provided with a through hole 510, which connects the second intake section 1232 to the external space of the cylinder body 120. Therefore, by providing a plug 500 with a through hole 510, on the one hand, a small amount of low-pressure refrigerant located in the external space of the cylinder 120 can be drawn into the compression chamber 127 through the through hole 510 and the second suction section 1232 during the suction process, thereby increasing the suction volume of the compressor; on the other hand, the plug 500 can reduce the size of the opening at the end of the second suction section 1232 away from the first receiving chamber 121, thereby reducing the amount of lubricating oil flowing out through the second suction section 1232, reducing wear, and extending the life of the compressor.

[0091] In other embodiments, to further reduce the amount of lubricating oil flowing out through the second suction section 1232, the suction channel 123 can be located on the upper, front, or rear side of the first receiving cavity 121, as long as the suction channel 123 is not located on the lower side of the first receiving cavity 121. That is, the second suction section 1232 is not located on the lower side of the first receiving cavity 1211, thereby increasing the difficulty for lubricating oil to flow out through the second suction section 1232, reducing the amount of lubricating oil flowing out, reducing wear, and extending the life of the compressor.

[0092] Reference Figure 3As shown, it can be understood that, to ensure the structural strength of the cylinder body 120, the first intake section 1231 is located at the midpoint of the cylinder wall 122 along its own thickness direction. That is, the minimum distance L1 between the inner circumferential wall of the first intake section 1231 and the inner circumferential wall of the first receiving cavity 121 is equal to the minimum distance L2 between the inner circumferential wall of the first intake section 1231 and the outer circumferential wall of the cylinder body 120. In other words, the minimum thickness of the walls of the first intake section 1231 on both radial sides of the first receiving cavity 121 is equal, and the minimum distances L1 and L2 between the inner circumferential wall of the first intake section 1231 and the outer circumferential wall of the cylinder body 120 are both not less than 1 mm. Therefore, the wall thickness at any point in the cylinder body 120 is sufficiently large to ensure structural strength and improve heat insulation.

[0093] Reference Figure 9 As shown, it can be understood that in some embodiments, the intake passage 123 is formed by a single channel, and the intake passage 123 is arranged obliquely relative to the direction of movement of the first piston 200, that is, the intake passage 123 is arranged obliquely relative to the central axis of the first receiving cavity 121. One end of the intake passage 123 extends to the end face of the cylinder 120 facing the valve plate 410 and forms a second connection port 1234, and the other end extends to the inner peripheral wall of the first receiving cavity 121 and forms a first connection port 1233. In this way, the structure of the intake passage 123 can be simplified, the processing can be facilitated, and the intake resistance can be reduced, which is beneficial to increasing the intake volume and improving the efficiency of the compressor.

[0094] It is understood that, in the embodiment where the second connection port 1234 is disposed on the outer peripheral wall of the cylinder body 120, the intake channel 123 is formed by a channel, and the intake channel 123 may be arranged radially along the first receiving cavity 121, or the intake channel 123 may be arranged obliquely relative to the central axis of the first receiving cavity 121.

[0095] It is understood that in any of the above embodiments, there can be multiple suction channels 123, which are arranged circumferentially at intervals along the first receiving cavity 121, that is, at intervals along the direction surrounding the central axis of the first receiving cavity 121. The second connection ports 1234 of the multiple suction channels 123 are all connected to the suction port 412, which is arc-shaped, and the suction cavity 434 matches the shape of the suction port 412. Therefore, the suction volume can be further increased, and the efficiency of the compressor can be improved.

[0096] After being compressed in the compression chamber 127, the refrigerant becomes a high-temperature, high-pressure refrigerant. Since the suction channel 123 is located on the radial side of the compression chamber 127, the high-temperature refrigerant easily transfers heat to the suction channel 123, especially at the end of the suction channel 123 near the valve plate 410, where the temperature is even higher. This causes the refrigerant to be heated and expand as it passes through the suction channel 123 during the suction process, resulting in a decrease in the suction volume and affecting the efficiency of the compressor.

[0097] Therefore, referring to Figure 3 As shown, it can be understood that in any of the above embodiments, the pump body assembly further includes a heat insulation sleeve 600, which may be made of silicone, fiberglass, or other materials. The heat insulation sleeve 600 is fixedly installed on part or all of the inner peripheral wall of the intake channel 123. For example, the heat insulation sleeve 600 is interference-fitted with the cylinder 120.

[0098] In the embodiment where the air intake channel 123 includes a first air intake section 1231 and a second air intake section 1232, since the first air intake section 1231 is closer to the valve plate 410 than the second air intake section 1232, the heat of the high-temperature refrigerant is more easily transferred to the first air intake section 1231. Therefore, the heat insulation sleeve 600 is only installed on the inner peripheral wall of the first air intake section 1231 to reduce material usage and lower costs.

[0099] In the embodiment where the intake channel 123 is formed by a single channel and the intake channel 123 is arranged at an angle relative to the direction of movement of the first piston 200, the heat insulation sleeve 600 is installed only on the inner peripheral wall of the section of the intake channel 123 near the valve plate 410.

[0100] Of course, the heat insulation sleeve 600 can be installed on the inner circumferential wall of the entire air intake channel 123.

[0101] Therefore, by providing a heat insulation sleeve 600 on the inner circumferential wall of the intake channel 123, the heat transferred from the compression chamber 127 to the intake channel 123 can be reduced, avoiding the problem of reduced intake volume caused by the refrigerant in the intake channel 123 expanding due to heat during the intake process, thus effectively ensuring the efficiency of the compressor.

[0102] During the movement of the first piston 200 from bottom dead center Q to top dead center P, theoretically, the first end of the first piston 200 must pass the first connection port 1233 before the compression stroke begins. If the distance between the two ends of the first connection port 1233 along the central axis of the first receiving cavity 121 is too large, the compression stroke will be too small, affecting the compression efficiency of the compressor.

[0103] Therefore, referring to Figure 10As shown, it can be understood that in some embodiments, the first connection port 1233 is elongated, for example, the first connection port 1233 is elliptical, or the first connection port 1233 is an elongated hole. Specifically, the first connection port 1233 extends circumferentially along the first receiving cavity 121, that is, the line connecting the two ends of the first connection port 1233 furthest apart in the circumferential direction of the first receiving cavity 121 is longer than the line connecting the two ends of the first connection port 1233 furthest apart in the direction of the central axis of the first receiving cavity 121. In other words, the maximum length dimension of the first connection port 1233 in the circumferential direction of the first receiving cavity 121 is greater than the maximum width dimension of the first connection port 1233 in the direction of the central axis of the first receiving cavity 121. Therefore, based on the premise that the projection area of ​​the first connection port 1233 on the inner peripheral wall of the first receiving cavity 121 is equal, that is, based on the premise that the refrigerant intake is the same, by setting the first connection port 1233 to be elongated and extending the first connection port 1233 along the circumferential direction of the first receiving cavity 121, the range occupied by the first connection port 1233 in the moving direction of the first piston 200 can be reduced, thereby increasing the compression stroke and improving the compression efficiency of the compressor.

[0104] Reference Figure 4 and Figure 5 As shown, the exhaust valve 420 is a one-way valve structure. Specifically, the exhaust valve 420 includes a valve core 421, which is a cylindrical mass block with a T-shaped longitudinal section. The central axis of the valve core 421 is parallel to the central axis of the first receiving cavity 121, and the large end of the valve core 421 faces the first receiving cavity 121. The exhaust valve 420 is mounted on the end cover 430. Correspondingly, the end cover 430 includes a mounting portion 432 located within the exhaust cavity 431. The mounting portion 432 has a mounting cavity 4321 with an opening facing the first exhaust port 411. The small end of the valve core 421 is slidably mounted in the mounting cavity 4321 along the direction of the central axis of the first receiving cavity 121, that is, the movement direction of the valve core 421 is parallel to the movement direction of the first piston 200. In other words, the valve core 421 is floatingly mounted in the mounting cavity 4321. When the large end of the valve core 421 abuts against the inner wall of the first exhaust port 411, the valve core 421 can close the first exhaust port 411.

[0105] Therefore, during the intake, compression, and expansion strokes, the air pressure in the exhaust chamber 431 is greater than the air pressure in the compression chamber 127. Under the action of the pressure difference, the valve core 421 is driven to move towards the first receiving chamber 121 and the large end of the valve core 421 abuts against the inner peripheral wall of the first exhaust port 411, thereby sealing the first exhaust port 411 so that the refrigerant can be drawn into the compression chamber 127 and compressed. During the compression stroke, the refrigerant in the compression chamber 127 is compressed. When the air pressure in the compression chamber 127 is greater than the air pressure in the exhaust chamber 431, under the action of the pressure difference, the valve core 421 is driven to move towards the end cap 430, that is, entering the exhaust stroke. The exhaust chamber 431 is connected to the compression chamber 127 through the first exhaust port 411. The compressed high-temperature and high-pressure refrigerant is discharged into the exhaust chamber 431 through the first exhaust port 411, completing the exhaust stroke.

[0106] Similarly, by setting the valve core 421 as a cylindrical mass block instead of a valve plate structure, the exhaust can be reliably controlled regardless of whether the compressor is running at low or high speeds. This takes into account the performance and reliability requirements of the exhaust valve 420 at both low and high speeds, thus improving the reliability of the exhaust process. At the same time, it eliminates the aerodynamic noise caused by the opening and closing of the valve plate during the exhaust process, effectively reducing the operating noise of the compressor.

[0107] Reference Figure 4 and Figure 5 As shown, to improve the sealing performance of the valve core 421 when closing the first exhaust port 411, the exhaust valve 420 also includes an elastic element 422. The elastic element 422 can be a spring, sheet, or other elastic structure. The elastic element 422 is installed in the mounting cavity 4321 and connected to the small end of the valve core 421. One end of the elastic element 422 abuts against the bottom wall of the mounting cavity 4321, and the other end is sleeved on the outer periphery of the small end of the valve core 421. The inner diameter of the mounting cavity 4321 is 0.2 mm to 0.5 mm larger than the outer diameter of the elastic element 422, which can ensure the stability of the elastic element 422 under pressure. Therefore, during the three strokes of intake, compression, and expansion, under the pressure difference between the exhaust chamber 431 and the compression chamber 127 and the elastic force of the elastic element 422, the large end of the valve core 421 can press against the inner peripheral wall of the first exhaust port 411. The large end of the valve core 421 is tightly fitted with the inner peripheral wall of the first exhaust port 411, resulting in good sealing and avoiding the drawback of air leakage from the first exhaust port 411 that would affect the intake of refrigerant into the compression chamber 127 and the compression of the refrigerant.

[0108] Understandably, to ensure the normal opening and closing of valve core 421, the mass of valve core 421 is defined as m, the stiffness of elastic element 422 as k, and the maximum operating frequency of the compressor as f, satisfying: .

[0109] Reference Figure 4 and Figure 5As shown, it can be understood that the inner peripheral wall of the first exhaust port 411 includes a first sealing wall surface 4111, which is arranged around the centerline of the first exhaust port 411 and is conical, with the small end of the conical first sealing wall surface 4111 facing the first receiving cavity 121. Correspondingly, the outer peripheral wall of the large end of the valve core 421 includes a second sealing wall surface 4211, the shape of which matches the shape of the first sealing wall surface 4111, that is, the second sealing wall surface 4211 is also conical. Therefore, when the valve core 421 closes the first exhaust port 411, under the pressure difference between the exhaust cavity 431 and the compression cavity 127 and the elastic force of the elastic element 422, the first sealing wall surface 4111 and the second sealing wall surface 4211 abut against each other. Since the first sealing wall surface 4111 and the second sealing wall surface 4211 are conical, as the valve core 421 moves toward the first receiving cavity 121, the clamping force between the first sealing wall surface 4111 and the second sealing wall surface 4211 gradually increases, which helps to improve the sealing performance.

[0110] Reference Figure 4 and Figure 5 As shown, it can be understood that the end face of the mounting portion 432 facing the valve plate 410 is further away from the valve plate 410 than the end face of the end cover 430 facing the valve plate 410. In other words, the mounting portion 432 is located inside the exhaust chamber 431 and does not protrude from the end face of the end cover 430 facing the valve plate 410. The minimum distance between the end face of the mounting portion 432 facing the valve plate 410 and the valve plate 410 is greater than the minimum distance between the end face of the end cover 430 facing the valve plate 410 and the valve plate 410, by at least 0.2 mm. Therefore, the end face of the end cover 430 facing the valve plate 410 can be tightly attached to the second gasket 126 to ensure a tight seal.

[0111] The compressor of the second aspect of this utility model includes the pump body assembly of the first aspect of this utility model, which will not be described in detail here.

[0112] Since the compressor adopts all the technical solutions of the pump body assembly of the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments.

[0113] The household appliance of the third aspect of this utility model includes the compressor of the second aspect of this utility model. The household appliance may be a refrigerator, an air conditioner, a water dispenser, etc.

[0114] Because the household appliance adopts all the technical solutions of the compressor in the above embodiments, it has at least all the beneficial effects brought about by the technical solutions in the above embodiments.

[0115] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A pump body assembly, characterized by, include: A crankcase includes a body and a cylinder block located at one end of the body, the cylinder block having a first receiving cavity, a second receiving cavity and an exhaust muffler cavity; The first piston is adapted to reciprocate within the first receiving cavity; The second piston is adapted to reciprocate within the second receiving cavity; A crankshaft, including an eccentric portion, is rotatably mounted on the body portion; A first connecting rod and a second connecting rod, one end of the first connecting rod is hinged to the eccentric part and the other end is connected to the first piston; one end of the second connecting rod is hinged to the eccentric part and the other end is connected to the second piston; the first connecting rod and the second connecting rod respectively drive the first piston and the second piston to reciprocate. A first intake and exhaust mechanism is installed in the cylinder block and located at one end of the first receiving cavity away from the crankshaft. The first intake and exhaust mechanism includes a first exhaust section. The second intake and exhaust mechanism is installed in the cylinder block and located at one end of the second receiving cavity away from the crankshaft. The second intake and exhaust mechanism includes a second exhaust section. Both the first exhaust section and the second exhaust section are connected to the exhaust muffler cavity.

2. The pump body assembly of claim 1, wherein: The first and second receiving cavities are arranged symmetrically about the rotation axis of the crankshaft.

3. The pump body assembly of claim 1, wherein: The first receiving cavity includes a compression cavity located on the side of the first piston facing the first intake and exhaust mechanism. The first intake and exhaust mechanism also includes a first intake part. The cylinder body is provided with an intake channel. The intake channel includes a first connection port and a second connection port located at both ends. The second connection port communicates with the first intake part. The first connection port is located on the inner peripheral wall of the first receiving cavity. The first piston can expose the first connection port in the compression cavity so that the intake channel communicates with the compression cavity, or block the intake channel from the compression cavity.

4. The pump body assembly of claim 3, wherein: The air intake channel includes a first air intake section and a second air intake section. The first air intake section is arranged along the central axis of the first accommodating cavity. The two ends of the second air intake section pass through the inner peripheral wall of the first accommodating cavity and the outer peripheral wall of the cylinder, respectively. One end of the first air intake section extends to the end face of the cylinder facing the first air intake and exhaust mechanism, and the other end communicates with the second air intake section.

5. The pump body assembly of claim 4, wherein: The pump body assembly also includes a sealing member with a through hole. The sealing member is installed at the end of the second intake section away from the first receiving cavity, and the through hole connects the second intake section with the external space of the cylinder.

6. The pump body assembly of claim 3, wherein: The intake channel is arranged at an angle relative to the central axis of the first receiving cavity, and one end of the intake channel extends to the inner peripheral wall of the first receiving cavity, while the other end extends to the end face of the cylinder facing the first intake and exhaust mechanism.

7. A pump body assembly according to any one of claims 3 to 6, wherein: The pump body assembly also includes a heat insulation sleeve, which is installed on the inner peripheral wall of the air intake channel.

8. The pump body assembly of claim 1, wherein: The first intake and exhaust mechanism includes a valve plate, an end cap, and an exhaust valve. The valve plate is mounted on the cylinder block and located at the end of the first receiving cavity opposite to the crankshaft. The end cap is mounted on the side of the valve plate opposite to the cylinder block. The valve plate has a first exhaust hole communicating with the first receiving cavity. The end cap has an exhaust cavity. The exhaust valve includes a valve core movably mounted on the end cap. The valve core is used to close the first exhaust hole or to allow the exhaust cavity to communicate with the first receiving cavity through the first exhaust hole.

9. The pump body assembly of claim 8, wherein: The exhaust valve also includes an elastic element, which is installed on the end cap and connected to the valve core to drive the valve core to close the first exhaust port.

10. The pump body assembly of claim 1, wherein: The first connecting rod includes a first connecting ring and a first support portion. The first support portion is connected to the outer periphery of the first connecting ring and extends toward one axial end of the first connecting ring. The second connecting rod includes a second connecting ring and a second support portion. The second support portion is connected to the outer periphery of the second connecting ring and extends toward one axial end of the second connecting ring. Both the first connecting ring and the second connecting ring are sleeved on the eccentric portion. The first support portion abuts against the outer peripheral wall of the second connecting ring, and the second support portion abuts against the outer peripheral wall of the first connecting ring.

11. Compressor, characterized in that The device includes a housing, a drive assembly, and a pump body assembly as described in any one of claims 1 to 10, wherein the pump body assembly and the drive assembly are both mounted within the housing, and the drive assembly is connected to the crankshaft to drive the crankshaft to rotate.

12. Household appliance, characterized in that Includes the compressor as described in claim 11.

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