Pump body components, compressor and household appliances

Abstract

This utility model discloses a pump body assembly, a compressor, and a household appliance. The pump body assembly includes a cylinder, a piston, a valve plate, and an exhaust valve. The cylinder has a receiving cavity and includes a cylinder wall. The cylinder wall has an intake channel. A first connection port of the intake channel is located on the inner peripheral wall of the receiving cavity, and a second connection port of the intake channel communicates with the intake port of the pump body assembly. The valve plate is located at one end of the receiving cavity. The receiving cavity includes a compression cavity located between the piston and the valve plate. During the piston's stroke, it has a top dead center near the valve plate and a bottom dead center away from the valve plate. The first connection port is located on the side of the top dead center facing the bottom dead center, and when the piston is at the bottom dead center, at least a portion of the first connection port is exposed in the compression cavity. This utility model's pump body assembly eliminates the intake valve structure, which improves the reliability of the intake process and eliminates the aerodynamic noise caused by the intake valve during intake, effectively reducing operating noise.

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] In the pump assembly of a reciprocating compressor, valves are typically used to control the intake of gas into the cylinder. Compressors generally operate at various frequencies. For example, in refrigeration systems, compressors need to increase their speed for rapid cooling, and then maintain the system at low speeds to reduce energy consumption once the cooling temperature is reached. Therefore, the valve must simultaneously meet the performance and reliability requirements of the compressor at both low and high speeds. Currently, existing valves are typically thin-plate leaf spring structures; however, this structure cannot simultaneously meet the performance and reliability requirements of the compressor at both low and high speeds. For instance, at low speeds, the valve needs to be thin to open properly; however, excessively thin valves have low structural strength and are prone to breakage at high speeds, leading to decreased reliability. Furthermore, regardless of the operating condition, the valve generates aerodynamic noise during opening and closing, resulting in relatively high compressor operating noise. 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 eliminates the intake valve structure, which helps to improve the reliability of the intake process and eliminates the aerodynamic noise caused by the intake valve during the intake process, effectively reducing operating noise.

[0004] This utility model also provides a compressor and a household appliance having the above-mentioned pump body assembly.

[0005] A pump assembly according to a first aspect of the present invention includes a cylinder, a receiving cavity, and a cylinder wall located on the outer periphery of the receiving cavity. The cylinder wall has an air intake channel, the air intake channel having a first connection port and a second connection port located at both ends. The first connection port is located on the inner peripheral wall of the receiving cavity, and the second connection port communicates with the air intake port of the pump assembly. A piston is configured to reciprocate within the receiving cavity. A valve plate is mounted on the cylinder and located at one end of the receiving cavity along the movement direction of the piston. The valve plate has a first exhaust port, which communicates with the receiving cavity. An exhaust valve is used to open or close the first exhaust port. The receiving cavity includes a compression cavity located between the piston and the valve plate, having a top dead center near the valve plate and a bottom dead center away from the valve plate during the piston's movement stroke. The first connection port is located on the side of the top dead center facing the bottom dead center, and when the piston is at the bottom dead center, at least a portion of the first connection port is exposed in the compression cavity.

[0006] According to the first aspect of the present invention, the pump body assembly has at least the following beneficial effects: by providing an air intake channel on the cylinder wall of the cylinder body, and the second connection port of the air intake channel is connected to the air intake port of the pump body assembly, and the first connection port of the air intake channel is provided on the inner peripheral wall of the receiving cavity and located on the side facing the bottom dead center from the top dead center, when the piston moves to the bottom dead center, at least a portion of the first connection port is exposed in the compression cavity, so that the air intake channel is connected to the compression cavity, and under the action of negative pressure, the refrigerant can enter the compression cavity from the air intake port through the air intake channel to realize air intake; when the piston moves from the bottom dead center to the top dead center, the end of the piston facing the compression cavity passes the first connection port, which can block the air intake channel from the compression cavity. In this way, the flow between the intake passage and the compression chamber can be controlled by the movement of the piston, thereby controlling the intake process. There is no need to set up an intake valve structure, which helps to improve the reliability of the intake process. It can also meet the performance and reliability requirements of the intake structure of the compressor at both low and high speeds. At the same time, it eliminates the aerodynamic noise caused by the opening and closing of the intake valve during the intake process, effectively reducing the operating noise of the compressor.

[0007] According to some embodiments of the present invention, the valve plate is provided with an air intake hole, and 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 moving direction and extends to the wall of the cylinder facing the valve plate. The first air intake section communicates with the air intake hole, and the second air intake section communicates with the first air intake section and extends to the inner peripheral wall of the receiving cavity in a direction perpendicular to the moving direction.

[0008] According to some embodiments of the present invention, the end of the second intake section away from the receiving cavity extends to the outer peripheral wall of the cylinder and communicates with the external space of the cylinder.

[0009] According to some embodiments of the present invention, the pump body assembly further includes a sealing member, which is installed at one end of the second intake section away from the receiving cavity. The sealing member has a through hole that connects the second intake section with the external space of the cylinder.

[0010] According to some embodiments of the present invention, the minimum distance between the inner peripheral wall of the first intake section and the inner peripheral wall of the receiving cavity is equal to the minimum distance between the inner peripheral wall of the first intake section and the outer peripheral wall of the cylinder.

[0011] According to some embodiments of the present invention, the pump body assembly further includes a heat insulation sleeve, which is fixedly installed on the inner peripheral wall of the air intake channel.

[0012] According to some embodiments of the present invention, the first connection port is configured as an elongated strip and extends circumferentially along the inner wall of the receiving cavity, and the maximum length dimension of the first connection port along the circumferential direction of the receiving cavity is greater than the maximum width dimension of the first connection port along the central axis of the receiving cavity.

[0013] According to some embodiments of the present invention, the air intake channel is arranged at an angle relative to the moving direction, and one end of the air intake channel extends to the wall of the cylinder facing the valve plate, and the other end extends to the inner peripheral wall of the receiving cavity.

[0014] According to some embodiments of the present invention, there are multiple air intake channels, and the multiple air intake channels are arranged at intervals along the direction surrounding the central axis of the receiving cavity.

[0015] According to some embodiments of the present invention, the pump body assembly further includes an end cap, which is installed on the side of the valve plate away from the cylinder body. The end cap is provided with an exhaust chamber and a mounting portion. The mounting portion is provided with a mounting cavity with an opening facing the first exhaust hole. The exhaust valve includes a valve core, which is movably installed in the mounting cavity along the moving direction and is used to close the first exhaust hole or to allow the exhaust chamber to communicate with the receiving cavity through the first exhaust hole.

[0016] According to some embodiments of the present invention, the exhaust valve further includes an elastic element, which is installed in the mounting cavity and connected to the valve core. The elastic element is used to drive the valve core to move toward the valve plate to close the first exhaust port.

[0017] According to some embodiments of the present invention, the inner peripheral wall of the first exhaust hole includes a first sealing wall surface, the first sealing wall surface is arranged around the center line of the first exhaust hole and is conical, the small end of the first sealing wall surface faces the receiving cavity, and the outer peripheral wall of the valve core includes a second sealing wall surface, the shape of the second sealing wall surface matches the shape of the first sealing wall surface and can abut against the first sealing wall surface.

[0018] According to some embodiments of the present invention, the end face of the mounting portion facing the valve plate is further away from the valve plate than the end face of the end cover facing the valve plate.

[0019] According to some embodiments of the present invention, the valve plate is further provided with a second exhaust port, the cylinder wall is provided with an exhaust channel, the two ends of the second exhaust port are respectively connected to the exhaust chamber and the exhaust channel, and the second exhaust port and the first exhaust port are located on the same side of a vertical plane passing through the central axis of the receiving cavity.

[0020] 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. The drive assembly is connected to the piston and is used to drive the piston to reciprocate.

[0021] The compressor according to the second aspect of the present invention has at least the following beneficial effects: Since the compressor uses the aforementioned pump assembly, an air intake channel is provided on the cylinder wall of the cylinder body, and the second connection port of the air intake channel is connected to the air intake port of the pump assembly. The first connection port of the air intake channel is located on the inner peripheral wall of the receiving cavity and on the side facing the bottom dead center from the top dead center. When the piston moves to the bottom dead center, at least a portion of the first connection port is exposed in the compression cavity, allowing the air intake channel to communicate with the compression cavity. Under negative pressure, refrigerant can enter the compression cavity from the air intake port through the air intake channel, thus achieving air intake. When the piston moves from the bottom dead center to the top dead center, the end of the piston facing the compression cavity passes the first connection port, thus blocking the air intake channel from the compression cavity. In this way, the flow between the intake passage and the compression chamber can be controlled by the movement of the piston, thereby controlling the intake process. There is no need to set up an intake valve structure, which helps to improve the reliability of the intake process. It can also meet the performance and reliability requirements of the intake structure of the compressor at both low and high speeds. At the same time, it eliminates the aerodynamic noise caused by the opening and closing of the intake valve during the intake process, effectively reducing the operating noise of the compressor.

[0022] The household appliance according to a third aspect of the present invention includes the compressor of the second aspect of the present invention.

[0023] The household appliance according to the third aspect of the present invention has at least the following beneficial effects: Because the household appliance uses the above-mentioned compressor, an air intake channel is provided on the cylinder wall of the cylinder body, and the second connection port of the air intake channel is connected to the air intake port of the pump body assembly. The first connection port of the air intake channel is located on the inner peripheral wall of the receiving cavity and on the side facing the bottom dead center from the top dead center. When the piston moves to the bottom dead center, at least a portion of the first connection port is exposed in the compression cavity, allowing the air intake channel to communicate with the compression cavity. Under negative pressure, refrigerant can enter the compression cavity from the air intake port through the air intake channel, thus achieving air intake. When the piston moves from the bottom dead center to the top dead center, the end of the piston facing the compression cavity passes the first connection port, thus blocking the air intake channel from the compression cavity. In this way, the flow between the intake passage and the compression chamber can be controlled by the movement of the piston, thereby controlling the intake process. There is no need to set up an intake valve structure, which helps to improve the reliability of the intake process. It can also meet the performance and reliability requirements of the intake structure of the compressor at both low and high speeds. At the same time, it eliminates the aerodynamic noise caused by the opening and closing of the intake valve during the intake process, effectively reducing the operating noise of the compressor.

[0024] 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

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 This is a partial cross-sectional view of the compressor in an embodiment of this utility model;

[0027] Figure 2 This is an exploded view of the pump body assembly in an embodiment of this utility model;

[0028] Figure 3 yes Figure 1 Enlarged view of point A in the image;

[0029] Figure 4 yes Figure 3 Enlarged view of point B in the image;

[0030] Figure 5 This is a partial cross-sectional view of the pump body assembly when the piston moves to the top dead center in an embodiment of this utility model;

[0031] Figure 6 yes Figure 5 Enlarged view of point C in the image;

[0032] Figure 7 This is a schematic diagram of the crankcase in an embodiment of the present invention;

[0033] Figure 8 This is a schematic diagram of the end cap structure in an embodiment of this utility model;

[0034] Figure 9 This is a schematic diagram of the valve plate structure in an embodiment of this utility model;

[0035] Figure 10 This is a partial sectional view of the cylinder body in another embodiment of the present invention;

[0036] Figure 11 This is a partial cross-sectional view of the cylinder body in another embodiment of this utility model.

[0037] Figure label:

[0038] Crankcase 100; Body 110; Cylinder block 120; 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 chamber 127; High-pressure silencer chamber 128;

[0039] Piston 200;

[0040] Valve plate 300; first exhaust port 310; first sealing wall surface 311; intake port 320; second exhaust port 330;

[0041] Exhaust valve 400; valve core 410; second sealing wall 411; elastic element 420;

[0042] 500mm plug; 510mm through hole;

[0043] 600mm heat insulation sleeve;

[0044] End cap 700; exhaust chamber 710; mounting part 720; mounting cavity 721; partition 730; intake chamber 740;

[0045] 800 intake silencer;

[0046] Drive assembly 900; stator 910; rotor 920; crankshaft 930; turntable 931; eccentric part 932; flat thrust bearing 940; connecting rod 950. Detailed Implementation

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Reference Figures 1 to 11 As 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.

[0052] The following section uses the refrigerator compressor as an example to explain the specific structure of the pump assembly in detail.

[0053] Reference Figure 1 As shown, the compressor here is a reciprocating compressor, comprising a housing, a drive assembly 900, and a pump assembly. The housing 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 mounted within the housing.

[0054] Reference Figure 1 and Figure 2 As shown, the pump assembly includes a crankcase 100, which comprises a body portion 110 and a cylinder block 120. The body portion 110 has a shaft hole in its center, extending vertically through the upper and lower end faces of the body portion 110. The cylinder block 120 is connected to the upper end of the body portion 110 and located on one side of the body portion 110 along the radial direction of the shaft hole. The cylinder block 120 has a receiving cavity 121, which extends radially through both end faces of the cylinder block 120. Typically, the receiving cavity 121 has a circular cross-section and a central axis arranged radially along the shaft hole, meaning the central axis of the receiving cavity 121 is perpendicular to the axis of the shaft hole. The radial direction of the shaft hole is perpendicular to the vertical direction (or the axis of the shaft hole) and extends from the axis of the shaft hole towards the inner circumferential wall of the shaft hole, and vice versa.

[0055] Reference Figure 1 , Figure 2 and Figure 3 As shown, it can be understood that the pump body assembly also includes a piston 200, which is generally cylindrical and whose outer diameter matches the inner diameter of the receiving cavity 121. The piston 200 is movably mounted in the receiving cavity 121 along the direction of the central axis of the receiving cavity 121, that is, the piston 200 can reciprocate within the receiving cavity 121 along the direction of the central axis of the receiving cavity 121.

[0056] Reference Figure 1As shown, the drive assembly 900 includes a stator 910, a rotor 920, and a crankshaft 930. The stator 910 is fixedly mounted on the lower end of the body 110 of the crankcase 100, and the lower end of the crankcase 100 and stator 910 assembly is connected to the housing by four support springs. The four support springs are evenly spaced along the circumference of the stator 910. Thus, the support springs reduce the impact of the crankcase 100 on the housing, achieving vibration damping, which helps to reduce the operating noise of the compressor and improve the installation stability of the compressor.

[0057] The stator 910 has an inner bore arranged vertically, the axis of which coincides with the axis of the shaft hole. The rotor 920 is rotatably mounted in the inner bore of the stator 910. The crankshaft 930 is fixedly connected to the rotor 920. The lower end of the crankshaft 930 protrudes from the lower end face of the rotor 920, and the upper end of the crankshaft 930 extends upward and passes through the shaft hole, protruding from the upper end face of the body portion 110. Typically, 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.

[0058] The drive assembly 900 also includes a connecting rod 950. The crankshaft 930 includes an eccentric portion 932 connected to the upper end face of the turntable 931. The eccentric portion 932 is offset from the rotation axis of the crankshaft 930. One end of the connecting rod 950 is hinged to the eccentric portion 932, and the other end is hinged to the piston 200. The hinge axis between the connecting rod 950 and the eccentric portion 932, and the hinge axis between the connecting rod 950 and the piston 200 are both arranged in the vertical direction.

[0059] 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 can then drive the piston 200 to reciprocate within the receiving cavity 121 via the connecting rod 950.

[0060] Reference Figure 3 , Figure 8 and Figure 9As shown, the pump body assembly also includes a valve plate 300 and an end cap 700. Specifically, the valve plate 300 is fixedly installed on the side of the cylinder body 120 opposite to the shaft hole along the central axis of the receiving cavity 121. That is, the valve plate 300 is located at one end of the receiving cavity 121 along the moving direction of the piston 200, and the valve plate 300 covers the opening of the receiving cavity 121 opposite to the shaft hole. The valve plate 300 is provided with a first exhaust port 310 and an intake port 320. The first exhaust port 310 communicates with the receiving cavity 121, that is, the first exhaust port 310 is located within the range surrounded by the projection of the inner peripheral wall of the receiving cavity 121 onto the valve plate 300. The intake port 320 is staggered from the receiving cavity 121 in a direction perpendicular to the central axis of the receiving cavity 121. That is, the intake port 320 is located outside the range surrounded by the projection of the inner peripheral wall of the receiving cavity 121 onto the valve plate 300. The intake port 320 is the intake port of the pump body assembly.

[0061] It is understood that the receiving cavity 121 includes a compression cavity 127 located between the valve plate 300 and the 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 310 is connected to the compression cavity 127.

[0062] The end cap 700 is fixedly installed on the side of the valve plate 300 facing away from the cylinder body 120. For example, the end cap 700, the valve plate 300, and the cylinder body 120 are fastened together by bolts. The end cap 700 is generally a cover structure with its opening facing the valve plate 300. Specifically, a partition 730 is provided inside the end cap 700. The partition 730 is generally U-shaped and divides the internal cavity of the end cap 700 into an exhaust chamber 710 and an intake chamber 740. The exhaust chamber 710 is located on the outer side of the U-shaped partition 730 along its thickness direction, and the intake chamber 740 is located on the inner side of the U-shaped partition 730 along its thickness direction. The exhaust chamber 710 communicates with the first exhaust port 310, allowing the exhaust chamber 710 to communicate with the compression chamber 127, while the intake chamber 740 communicates with the intake port 320.

[0063] Reference Figure 1 and Figure 2 As shown, the pump body assembly also includes a suction silencer 800, which is installed at the suction chamber 740 of the end cover 700 and is connected to the suction port 320. During the suction process, the refrigerant enters through the suction silencer 800, effectively reducing the aerodynamic noise during the refrigerant flow.

[0064] Reference Figure 7 and Figure 9 As shown, it can be understood that the valve plate 300 is also provided with a second vent 330, which is located outside the area surrounded by the projection of the inner peripheral wall of the receiving cavity 121 onto the valve plate 300.

[0065] Reference Figure 7 As shown, the cylinder body 120 has a cylinder wall 122, which is the wall located on the outer periphery of the receiving cavity 121, and the cylinder wall 122 is arranged around the central axis of the receiving cavity 121. It is easy to understand that the cylinder wall 122 has a certain thickness along the radial direction of the receiving cavity 121. Correspondingly, the cylinder wall 122 is provided with an exhaust channel 124, and the two ends of the second exhaust port 330 are respectively connected to the exhaust cavity 710 and the exhaust channel 124. The cylinder body 120 also has a high-pressure silencing cavity 128, which is located on one side of the receiving cavity 121, and the exhaust channel 124 is connected to the high-pressure silencing cavity 128. Therefore, during the exhaust process, the high-temperature and high-pressure refrigerant is discharged sequentially through the first exhaust port 310, the exhaust cavity 710, the second exhaust port 330, and the exhaust channel 124 to the high-pressure silencing cavity 128, where it is silenced before being supplied to the external refrigeration system of the compressor, reducing operating noise.

[0066] It is understandable that the second exhaust port 330 and the first exhaust port 310 are located on the same side of the vertical plane Z passing through the central axis of the receiving cavity 121, which can shorten the distance between the first exhaust port 310 and the second exhaust port 330, that is, shorten the exhaust path, reduce exhaust resistance, and help improve exhaust efficiency.

[0067] Reference Figure 2 As shown, it can be understood that, to improve the sealing between the end cap 700, the valve plate 300, and the cylinder body 120, a first gasket 125 is typically sandwiched between the valve plate 300 and the cylinder body 120, and a second gasket 126 is sandwiched between the end cap 700 and the valve plate 300 to prevent air leakage. It is easy to understand that the first gasket 125 has holes corresponding to the receiving cavity 121, the exhaust channel 124, the first exhaust hole 310, the second exhaust hole 330, and the intake hole 320, and the second gasket 126 has holes corresponding to the first exhaust hole 310, the second exhaust hole 330, and the intake hole 320.

[0068] Reference Figure 3As shown, it can be understood that the end of piston 200 closest to valve plate 300 is defined as the first end, and the end furthest from valve plate 300 is defined as the second end. It is easy to understand that during the stroke of piston 200, there are top dead center (TDC) P and bottom dead center (BDC) Q, where TDC P is closer to valve plate 300 and BDC Q is farther from valve plate 300. TDC P is the position of the first end of piston 200 within the receiving cavity 121 when piston 200 moves to its furthest point from the rotation axis of crankshaft 930, and BDC Q is the position of the first end of piston 200 within the receiving cavity 121 when piston 200 moves to its closest point to the rotation axis of crankshaft 930. That is, the distance between TDC P and BDC Q in the direction of piston 200's movement is the stroke of piston 200. During the reciprocating movement of piston 200, the compressor can complete a working cycle of four strokes: expansion, intake, compression, and exhaust. The radial direction of the receiving cavity 121 is the direction perpendicular to the central axis of the receiving cavity 121 and pointing from the central axis of the receiving cavity 121 to the inner peripheral wall of the receiving cavity 121 and the reverse direction.

[0069] Reference Figure 3 and Figure 4 As shown, the pump assembly also includes an exhaust valve 400, which is a one-way valve. The exhaust valve 400 is mounted on the end cover 700 and is used to open or close the first exhaust port 310. When the exhaust valve 400 opens the first exhaust port 310, fluid is only allowed to flow from the compression chamber 127 to the exhaust chamber 710. It is readily understood that during the intake, compression, and expansion strokes, the exhaust valve 400 can close the first exhaust port 310, and during the exhaust stroke, the exhaust valve 400 can open the first exhaust port 310 to allow refrigerant to be discharged from the compression chamber 127 to the exhaust chamber 710.

[0070] 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 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 away from the shaft hole, and the second connection port 1234 and the intake hole 320 are arranged correspondingly in the direction of the central axis of the receiving cavity 121, and the second connection port 1234 communicates with the intake hole 320. Since the intake muffler 800 is installed at the intake chamber 740 of the end cover 700, by setting the intake hole 320 (i.e. intake port) on the valve plate 300 and setting the second connection port 1234 on the end face of the cylinder body 120 away from the shaft hole, so that the intake muffler 800 can communicate with the intake channel 123 through the intake hole 320, the modification of the installation structure of the intake muffler 800 can be reduced, which is beneficial to reducing costs.

[0071] 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 300 may not have an intake port 320. In this case, the intake port is 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 700, and the outlet of the intake muffler 800 may be connected to the second connection port 1234 through an air pipe to achieve intake.

[0072] 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 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 piston 200.

[0073] Therefore, when the piston 200 is at bottom dead center Q, at least a portion of the first connection port 1233 is exposed in the compression chamber 127, allowing the intake passage 123 to communicate with the compression chamber 127 for intake, i.e., refrigerant is drawn into the compression chamber 127. It is easily understood that as the piston 200 moves from bottom dead center Q to top dead center P, when the first end of the piston 200 passes the first connection port 1233, the outer peripheral wall of the piston 200 covers the first connection port 1233, thus blocking the intake passage 123 from the compression chamber 127. Furthermore, as the piston 200 moves further towards top dead center P, the outer peripheral wall of the piston 200 always covers the first connection port 1233. Alternatively, when the second end of the piston 200 also passes the first connection port 1233, the first connection port 1233 is exposed in the cavity within the receiving cavity 121 located on the side of the piston 200 away from the compression chamber 127. In this case, the intake passage 123 is also blocked from the compression chamber 127.

[0074] 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 300 is arranged radially with the bottom dead center Q in the receiving cavity 121. At this time, when the piston 200 moves from the top dead center P to the bottom dead center Q, and moves 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 intake cavity 740 enters the compression cavity 127 through the intake channel 123 to achieve rapid intake; when the piston 200 moves from the bottom dead center Q to the top dead center P, and the first end of the piston 200 just passes the first connection port 1233, the outer peripheral wall of the piston 200 covers the first connection port 1233, and the intake channel 123 is blocked from the compression cavity 127, so as to compress and exhaust the refrigerant in the compression cavity 127.

[0075] Of course, it is understood that in some other embodiments, the bottom dead center Q may be located within the range of the first connection port 1233 in the direction of movement of the piston 200. That is, the bottom dead center Q is located between the two ends of the first connection port 1233 along the direction of movement of the piston 200. Therefore, when the piston 200 is at the bottom dead center Q, a portion of the first connection port 1233 is exposed in the compression chamber 127, thereby allowing the intake passage 123 to communicate with the compression chamber 127 for intake.

[0076] 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.

[0077] When piston 200 moves from top dead center P to bottom dead center Q, exhaust valve 400 closes the first exhaust port 310, the volume of compression chamber 127 increases, and the air pressure decreases, which is the expansion stroke. When part of the first connection port 1233 is exposed in compression chamber 127, the intake passage 123 connects to compression chamber 127, and the intake stroke begins. Since the air pressure in compression chamber 127 is lower than the pressure of the low-pressure refrigerant, the low-pressure refrigerant is drawn into compression chamber 127 through intake passage 123, which is the intake stroke. During this time, the first exhaust port 310 remains closed. When piston 200 moves to bottom dead center Q, the first connection port 1233 is fully exposed in compression chamber 127 for rapid intake, until the air pressure in 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 part of the first connection port 1233 is exposed in compression chamber 127. After piston 200 moves to bottom dead center Q, it moves from bottom dead center Q to top dead center P. When the first end of piston 200 just passes the first connection port 1233, the outer peripheral wall of piston 200 covers the first connection port 1233, closing the first connection port 1233. At this time, the first exhaust port 310 remains closed, and the compression chamber 127 is a sealed space. As piston 200 moves further to top dead center P, the volume of compression chamber 127 decreases, and the low-pressure refrigerant in compression chamber 127 is compressed into high-temperature and high-pressure refrigerant, which is the compression stroke. That is, during the compression stroke, the intake passage 123 and the compression chamber 127 are blocked. When the air pressure in compression chamber 127 is high enough, exhaust valve 400 opens the first exhaust port 310, and the high-temperature and high-pressure refrigerant is discharged into the exhaust chamber 710 through the first exhaust port 310, which is the exhaust stroke. The exhaust stroke ends when piston 200 moves to top dead center P, and exhaust valve 400 closes the first exhaust port 310. Then piston 200 moves from top dead center P to bottom dead center Q, and so on, to compress the low-pressure refrigerant into a high-temperature and high-pressure refrigerant for use in the refrigeration system.

[0078] Therefore, during compressor operation, the reciprocating movement of 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.

[0079] 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 receiving cavity 121, that is, along the moving direction of the 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 receiving cavity 121, that is, along a direction perpendicular to the moving direction of the 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 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 300, and a second connection port 1234 is formed at the end face of the cylinder 120. 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 receiving cavity 121 extends to the inner peripheral wall of the receiving cavity 121, and a first connection port 1233 is formed at the inner peripheral wall of the 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 receiving cavity 121, so that the piston 200 can control the opening and closing of the intake channel 123 and the compression cavity 127, thereby controlling the intake process and improving the reliability of the intake process.

[0080] Of course, the first intake section 1231 is arranged along the central axis of the receiving cavity 121, and the second intake section 1232 can be arranged at an angle relative to the central axis of the receiving cavity 121.

[0081] Reference Figure 3 As shown, it can be understood that one end of the second intake section 1232, away from the central axis of the 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 receiving cavity 121 and the outer peripheral wall of the cylinder 120, respectively, thus connecting the second intake section 1232 with the external space of the cylinder 120. The external space of the cylinder 120 is the space located outside the cylinder 120 within the housing. 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 via 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 via the second intake section 1232, thereby increasing the compressor's intake volume and improving its working efficiency.

[0082] Furthermore, since the second intake section 1232 penetrates the inner peripheral wall of the 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 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 receiving cavity 121 to the second intake section 1232, which is convenient for machining.

[0083] Since the second intake section 1232 penetrates the inner peripheral wall of the receiving cavity 121 and the outer peripheral wall of the cylinder 120, the lubricating oil located in the receiving cavity 121 and used to provide lubrication and heat dissipation for the movement of the 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 piston 200 and cylinder 120, and affecting the life of the compressor.

[0084] 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 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 with 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 receiving cavity 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.

[0085] 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 receiving cavity 121, as long as the suction channel 123 is not located on the lower side of the receiving cavity 121. That is, the second suction section 1232 is not located on the lower side of the receiving cavity 121, 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.

[0086] 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 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 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.

[0087] Reference Figure 10 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 piston 200, that is, the intake passage 123 is arranged obliquely relative to the central axis of the receiving cavity 121. One end of the intake passage 123 extends to the end face of the cylinder 120 facing the valve plate 300 and forms a second connection port 1234, and the other end extends to the inner peripheral wall of the 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.

[0088] 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 receiving cavity 121, or the intake channel 123 may be arranged obliquely relative to the central axis of the receiving cavity 121.

[0089] It is understood that in any of the above embodiments, there can be multiple suction channels 123, which are arranged at intervals along the circumference of the receiving cavity 121, that is, at intervals along the direction surrounding the central axis of the receiving cavity 121. The second connection ports 1234 of the multiple suction channels 123 are all connected to the suction port 320, which is arc-shaped, and the suction cavity 740 matches the shape of the suction port 320. Therefore, the suction volume can be further increased, and the efficiency of the compressor can be improved.

[0090] 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 300, 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.

[0091] 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.

[0092] 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 300 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.

[0093] In the embodiment where the intake passage 123 is formed by a single channel and the intake passage 123 is arranged at an angle relative to the direction of movement of the piston 200, the heat insulation sleeve 600 is installed only on the inner peripheral wall of the section of the intake passage 123 near the valve plate 300.

[0094] Of course, the heat insulation sleeve 600 can be installed on the inner circumferential wall of the entire air intake channel 123.

[0095] 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.

[0096] During the movement of piston 200 from bottom dead center Q to top dead center P, theoretically, the first end of 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 receiving cavity 121 is too large, the compression stroke will be too small, affecting the compression efficiency of the compressor.

[0097] Therefore, referring to Figure 11As 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 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 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 receiving cavity 121. In other words, the maximum length dimension of the first connection port 1233 in the circumferential direction of the 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 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 receiving cavity 121 is equal, that is, based on the premise that the refrigerant intake is the same, setting the first connection port 1233 as an elongated strip and extending the first connection port 1233 along the circumferential direction of the receiving cavity 121 can reduce the range occupied by the first connection port 1233 in the moving direction of the piston 200, thereby increasing the compression stroke and improving the compression efficiency of the compressor.

[0098] Reference Figure 4 and Figure 6 As shown, the exhaust valve 400 is a one-way valve structure. Specifically, the exhaust valve 400 includes a valve core 410, which is a cylindrical mass block with a T-shaped longitudinal section. The central axis of the valve core 410 is parallel to the central axis of the receiving cavity 121, and the large end of the valve core 410 faces the receiving cavity 121. The exhaust valve 400 is mounted on the end cover 700. Correspondingly, the end cover 700 includes a mounting portion 720 located within the exhaust cavity 710. The mounting portion 720 has a mounting cavity 721 with an opening facing the first exhaust port 310. The small end of the valve core 410 is slidably mounted in the mounting cavity 721 along the direction of the central axis of the receiving cavity 121, that is, the movement direction of the valve core 410 is parallel to the movement direction of the piston 200. In other words, the valve core 410 is floatingly mounted in the mounting cavity 721. When the large end of the valve core 410 abuts against the inner wall of the first exhaust port 310, the valve core 410 can close the first exhaust port 310.

[0099] Therefore, during the intake, compression, and expansion strokes, the air pressure in the exhaust chamber 710 is greater than the air pressure in the compression chamber 127. Under the action of the pressure difference, the valve core 410 is driven to move towards the receiving chamber 121, and the large end of the valve core 410 abuts against the inner peripheral wall of the first exhaust port 310, thereby sealing the first exhaust port 310 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 710, under the action of the pressure difference, the valve core 410 is driven to move towards the end cap 700, that is, entering the exhaust stroke. The exhaust chamber 710 is connected to the compression chamber 127 through the first exhaust port 310, and the compressed high-temperature and high-pressure refrigerant is discharged into the exhaust chamber 710 through the first exhaust port 310, completing the exhaust stroke.

[0100] Similarly, by setting the valve core 410 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 400 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.

[0101] Reference Figure 4 and Figure 6 As shown, to improve the sealing performance of the valve core 410 when closing the first exhaust port 310, the exhaust valve 400 also includes an elastic element 420. The elastic element 420 can be a spring, sheet, or other elastic structure. The elastic element 420 is installed in the mounting cavity 721 and connected to the small end of the valve core 410. One end of the elastic element 420 abuts against the bottom wall of the mounting cavity 721, and the other end is sleeved on the outer periphery of the small end of the valve core 410. The inner diameter of the mounting cavity 721 is 0.2 mm to 0.5 mm larger than the outer diameter of the elastic element 420, which can ensure the stability of the elastic element 420 under pressure. Therefore, during the three strokes of intake, compression, and expansion, under the pressure difference between the exhaust chamber 710 and the compression chamber 127 and the elastic force of the elastic element 420, the large end of the valve core 410 can press against the inner peripheral wall of the first exhaust port 310. The large end of the valve core 410 is tightly fitted to the inner peripheral wall of the first exhaust port 310, resulting in good sealing and avoiding the drawback of air leakage from the first exhaust port 310, which would affect the intake of refrigerant into the compression chamber 127 and the compression of the refrigerant.

[0102] Understandably, to ensure the normal opening and closing of the valve core 410, the mass of the valve core 410 is defined as m, the stiffness of the elastic element 420 as k, and the maximum operating frequency of the compressor as f, satisfying: .

[0103] Reference Figure 4 and Figure 6As shown, it can be understood that the inner peripheral wall of the first exhaust port 310 includes a first sealing wall surface 311, which is arranged around the center line of the first exhaust port 310 and is tapered, with the small end of the tapered first sealing wall surface 311 facing the receiving cavity 121. Correspondingly, the outer peripheral wall of the large end of the valve core 410 includes a second sealing wall surface 411, the shape of which matches the shape of the first sealing wall surface 311, that is, the second sealing wall surface 411 is also tapered. Therefore, when the valve core 410 closes the first exhaust port 310, under the pressure difference between the exhaust cavity 710 and the compression cavity 127 and the elastic force of the elastic element 420, the first sealing wall surface 311 and the second sealing wall surface 411 abut against each other. Since the first sealing wall surface 311 and the second sealing wall surface 411 are conical, as the valve core 410 moves toward the receiving cavity 121, the clamping force between the first sealing wall surface 311 and the second sealing wall surface 411 gradually increases, which helps to improve the sealing performance.

[0104] Reference Figure 4 and Figure 6 As shown, it can be understood that the end face of the mounting portion 720 facing the valve plate 300 is further away from the valve plate 300 than the end face of the end cover 700 facing the valve plate 300. In other words, the mounting portion 720 is located inside the exhaust chamber 710 and does not protrude from the end face of the end cover 700 facing the valve plate 300. The minimum distance between the end face of the mounting portion 720 facing the valve plate 300 and the valve plate 300 is greater than the minimum distance between the end face of the end cover 700 facing the valve plate 300 and the valve plate 300, by at least 0.2 mm. Therefore, the end face of the end cover 700 facing the valve plate 300 can be tightly attached to the second gasket 126 to ensure a tight seal.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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 in that, include: The cylinder body has a receiving cavity and includes a cylinder wall located on the outer periphery of the receiving cavity. The cylinder wall has an air intake channel. The air intake channel includes a first connection port and a second connection port located at both ends. The first connection port is located on the inner peripheral wall of the receiving cavity, and the second connection port communicates with the air intake port of the pump body assembly. The piston is configured to reciprocate within the receiving cavity; A valve plate is installed on the cylinder body and located at one end of the receiving cavity along the moving direction of the piston. The valve plate is provided with a first exhaust hole, which communicates with the receiving cavity. An exhaust valve is used to open or close the first exhaust port; The receiving cavity includes a compression cavity located between the piston and the valve plate. During the piston's stroke, it has a top dead center near the valve plate and a bottom dead center away from the valve plate. The first connection port is located on the side of the top dead center facing the bottom dead center, and when the piston is at the bottom dead center, at least a portion of the first connection port is exposed in the compression cavity.

2. The pump body assembly according to claim 1, characterized in that: The valve plate is provided with an air intake hole, and 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 moving direction and extends to the wall of the cylinder facing the valve plate. The first air intake section is connected to the air intake hole, and the second air intake section is connected to the first air intake section and extends to the inner peripheral wall of the receiving cavity in a direction perpendicular to the moving direction.

3. The pump body assembly according to claim 2, characterized in that: The second intake section extends from the end opposite to the receiving cavity to the outer peripheral wall of the cylinder and communicates with the external space of the cylinder.

4. The pump body assembly according to claim 3, characterized in that: The pump body assembly also includes a sealing component, which is installed at the end of the second intake section away from the receiving cavity. The sealing component has a through hole that connects the second intake section with the external space of the cylinder.

5. The pump body assembly according to claim 2, characterized in that: The minimum distance between the inner peripheral wall of the first intake section and the inner peripheral wall of the receiving cavity is equal to the minimum distance between the inner peripheral wall of the first intake section and the outer peripheral wall of the cylinder.

6. The pump body assembly according to claim 1, characterized in that: The pump body assembly also includes a heat insulation sleeve, which is fixedly installed on the inner peripheral wall of the air intake channel.

7. The pump body assembly according to claim 1, characterized in that: The first connection port is configured as an elongated strip and extends circumferentially along the inner wall of the receiving cavity. The maximum length dimension of the first connection port along the circumferential direction of the receiving cavity is greater than the maximum width dimension of the first connection port along the central axis of the receiving cavity.

8. The pump body assembly according to claim 1, characterized in that: The air intake channel is arranged at an angle relative to the direction of movement, and one end of the air intake channel extends to the wall of the cylinder facing the valve plate, and the other end extends to the inner peripheral wall of the receiving cavity.

9. The pump body assembly according to claim 1 or 8, characterized in that: The number of air intake channels is multiple, and the multiple air intake channels are arranged at intervals along the direction surrounding the central axis of the receiving cavity.

10. The pump body assembly according to claim 1, characterized in that: The pump body assembly further includes an end cap, which is installed on the side of the valve plate away from the cylinder body. The end cap has an exhaust chamber and a mounting part. The mounting part has a mounting cavity with an opening facing the first exhaust port. The exhaust valve includes a valve core, which is movably installed in the mounting cavity along the moving direction and is used to close the first exhaust port or to allow the exhaust chamber to communicate with the receiving cavity through the first exhaust port.

11. The pump body assembly according to claim 10, characterized in that: The exhaust valve also includes an elastic element, which is installed in the mounting cavity and connected to the valve core. The elastic element is used to drive the valve core toward the valve plate to close the first exhaust port.

12. The pump body assembly according to claim 10 or 11, characterized in that: The inner peripheral wall of the first exhaust port includes a first sealing wall surface, which is arranged around the center line of the first exhaust port and is conical. The small end of the first sealing wall surface faces the receiving cavity. The outer peripheral wall of the valve core includes a second sealing wall surface, which is shaped to match the shape of the first sealing wall surface and can abut against the first sealing wall surface.

13. The pump body assembly according to claim 10, characterized in that: The end face of the mounting portion facing the valve plate is further away from the valve plate than the end face of the end cap facing the valve plate.

14. The pump body assembly according to claim 10, characterized in that: The valve plate is also provided with a second exhaust port, and the cylinder wall is provided with an exhaust channel. The two ends of the second exhaust port are respectively connected to the exhaust chamber and the exhaust channel. The second exhaust port and the first exhaust port are located on the same side of a vertical plane passing through the central axis of the receiving cavity.

15. A 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 14, wherein the pump body assembly and the drive assembly are both mounted within the housing, and the drive assembly is connected to the piston and used to drive the piston to reciprocate.

16. A household appliance, characterized in that, Includes the compressor as described in claim 15.

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