Pump body assembly, compressor and refrigeration equipment

Abstract

The utility model discloses a pump body assembly, a compressor and refrigeration equipment. The pump body assembly comprises an air cylinder and a pump body, the bearing is arranged on one side of the air cylinder; one part of the crankshaft is located in the air cylinder, and one end of the crankshaft penetrates through the air cylinder and is installed in the bearing; the piston is located in the air cylinder and installed on the crankshaft, and a first cavity is defined by the piston, the bearing and the crankshaft; the silencing cover is installed on the side, away from the air cylinder, of the bearing, and a silencing cavity is defined by the silencing cover and the bearing; a communicating channel is formed in the bearing, the first end of the communicating channel is used for communicating with the silencing cavity, and the second end of the communicating channel is used for communicating with the first cavity. According to the structure, refrigerant oil on the inner side of the piston can enter the silencing cavity through the communicating channel, so that the pressure difference between the inner side and the outer side of the piston can be reduced, media in the air suction cavity and the air exhaust cavity are not prone to leaking into the first cavity from the end face of the piston, and therefore the leakage loss of the end face of the piston can be reduced; the volume efficiency and the indication efficiency of the whole pump body assembly are improved, so that the energy efficiency of the compressor is improved.

Description

Technical Field

[0001] This application belongs to the field of refrigeration equipment technology, specifically relating to a pump assembly, a compressor, and refrigeration equipment. Background Technology

[0002] In the distribution of capacity loss in rotary compressors, leakage loss accounts for 40% to 50%, and piston end face leakage accounts for 30% to 40% of the total leakage loss. Therefore, reducing piston end face leakage is one of the effective ways to improve compressor energy efficiency.

[0003] Therefore, how to reduce end face leakage of the compressor piston and improve the energy efficiency of the compressor has become an urgent problem to be solved. Utility Model Content

[0004] This application aims to solve the problem of reduced compressor energy efficiency caused by piston end face leakage in the relevant scheme.

[0005] To address the aforementioned technical problems, an embodiment of the first aspect of this application provides a pump body assembly.

[0006] An embodiment of the second aspect of this application provides a compressor.

[0007] An embodiment of the third aspect of this application provides a refrigeration device.

[0008] An embodiment of the first aspect of this application provides a pump body assembly, including: a cylinder; a bearing disposed on one side of the cylinder; a crankshaft, a portion of which is located inside the cylinder, one end of which passes through the cylinder and is mounted inside the bearing; a piston, which is located inside the cylinder and mounted on the crankshaft, the piston, the bearing, and the crankshaft forming a first cavity; and a muffler cover, which is mounted on the side of the bearing away from the cylinder and forms a muffler cavity with the bearing; wherein the bearing is provided with a communicating channel, a first end of which is used to communicate with the muffler cavity, and a second end of which is used to communicate with the first cavity.

[0009] The pump assembly of this application is used in a compressor, which can be a rotary compressor. The pump assembly includes a cylinder, bearings, a crankshaft, a piston, and a muffler cover. The crankshaft passes through the cylinder, and its two ends are supported and mounted on main bearings and auxiliary bearings on both sides of the cylinder. The bearings in this application can be either main bearings or auxiliary bearings. With this pump assembly, the rotation of the crankshaft drives the piston to rotate eccentrically within the cylinder, thereby achieving intake and exhaust. The muffler cover is mounted on the end face of the bearing that does not contact the cylinder, forming a muffler cavity with the bearing. Simultaneously, the bearing is provided with a connecting channel that connects the muffler cavity and a first cavity (formed by the piston, bearing, and crankshaft). This structure allows the inner side of the piston to connect with the silencer chamber through a connecting channel. This allows the refrigerant oil inside the piston to enter the silencer chamber through the connecting channel, thereby reducing the pressure inside the piston and decreasing the pressure difference between the inner and outer sides of the piston (i.e., the intake and exhaust chambers). This makes it less likely for the medium in the intake and exhaust chambers to leak from the piston end face into the first cavity. This effectively reduces leakage losses at the piston end face, improves the volumetric efficiency and indicating efficiency of the entire pump assembly, and thus improves the compressor's energy efficiency.

[0010] In any of the above embodiments, optionally, the bearing includes a first surface disposed away from the cylinder and a second surface disposed near the cylinder, a connecting channel extending from the second surface to the first surface, an opening at the second end of the connecting channel being disposed on the second surface, and along the radial direction of the bearing, the first end of the connecting channel being located outside the second end of the connecting channel.

[0011] In this embodiment, the connecting channel extends from one end face of the bearing to the other end face, meaning the connecting channel runs through the entire bearing axially. This can also be understood as the opening at the first end of the connecting channel being located on a first surface, and the opening at the second end being located on a second surface. This arrangement allows the silencing chambers on both sides of the bearing and the first cavity to be directly connected, thereby reducing the length of the connecting channel, shortening the pressure relief path, and allowing the refrigerant oil in the first cavity to flow more easily into the silencing chamber. Simultaneously, when designing the connecting channel, the second end (i.e., the inlet end) can be positioned inwards, and the first end (i.e., the outlet end) can be positioned outwards. This allows the second end of the connecting channel to be closer to the inner side of the bearing, facilitating the sealing of the second end of the connecting channel by the piston and preventing direct connection between the second end of the connecting channel and the exhaust or intake chamber.

[0012] Of course, when a recess is provided on the first or second surface of the bearing, the side wall and bottom wall of the recess constitute part of the bearing surface. In this case, the openings at both ends of the connecting channel can also be directly provided on the side wall or bottom wall of the recess.

[0013] In any of the above embodiments, optionally, the connecting channel extends outwardly in a gradually inclined manner from the second end to the first end along the radial direction of the bearing.

[0014] In this embodiment, the connecting channel is inclined, meaning it gradually slopes outwards. This design makes the connecting channel a straight path, thereby shortening its length and the pressure relief path, allowing the refrigerant oil in the first cavity to flow more easily into the silencing cavity.

[0015] In other solutions, the connection channel can also be configured as a stepped structure.

[0016] In any of the above embodiments, optionally, an annular groove is provided on the surface of the bearing near the cylinder, and the annular groove is arranged in a ring around the circumference of the bearing shaft hole; wherein, along the radial direction of the bearing, the connecting channel is located outside the annular groove.

[0017] In this embodiment, the reliability of the bearing can be improved by providing an annular groove on the lower surface of the bearing. Specifically, when an annular groove is provided on the bearing, the connecting channel is located outside the annular groove.

[0018] In any of the above embodiments, optionally, the second end of the connecting channel is connected to the annular groove.

[0019] In this embodiment, the second end (inlet end) of the connecting channel is directly connected to the annular groove. For example, the opening of the second end of the connecting channel is set on the side wall of the annular groove, so that the connecting channel as a whole can be set closer to the center of the bearing, so that the connecting channel can be better closed by the piston.

[0020] In any of the above embodiments, optionally, the outer diameter of the piston is D, the eccentricity of the piston when mounted on the crankshaft is e, and the distance between the outer side of the second end of the connecting channel and the centerline of the bearing is L, wherein L is less than...

[0021] In this embodiment, since the piston is eccentrically mounted, in order to prevent the second end of the connecting channel from communicating with the exhaust chamber or intake chamber during piston rotation, it is necessary to ensure that the second end of the connecting channel is always located inside the outer wall of the piston when the piston rotates to any angle. This ensures that the inlet end of the connecting channel can always be sealed by the piston during piston rotation, thus preventing the medium in the exhaust chamber or intake chamber from leaking from the connecting channel.

[0022] Where R = D / 2, R is the radius of the circle containing the outer wall of the piston. By setting L to be less than Re, it can be ensured that the second end of the connecting channel is always located inside the outer wall of the piston when the piston rotates to any angle. This effectively prevents the medium in the exhaust chamber or intake chamber from leaking out of the connecting channel.

[0023] In any of the above embodiments, optionally, the crankshaft is provided with an eccentric portion and a thrust protrusion, the piston is provided with a mounting hole, the piston is mounted on the eccentric portion through the mounting hole, and the thrust protrusion is located on the side of the eccentric portion near the bearing; wherein, the first cavity is formed by the inner wall of the mounting hole, the eccentric portion, the outer side of the thrust protrusion and the bearing.

[0024] In this embodiment, an eccentric portion is provided on the crankshaft, and the piston is mounted on the eccentric portion and can rotate with the crankshaft. The crankshaft, through the eccentric portion, drives the piston to rotate, thereby changing the volume of the exhaust and intake chambers and compressing the medium. Furthermore, to ensure the piston's installation stability, a thrust protrusion is provided on the crankshaft. The thrust protrusion cooperates with a bearing to limit the axial movement of the crankshaft. The first cavity is formed by the inner wall of the mounting hole, the eccentric portion, the outer surface of the thrust protrusion, and the bearing.

[0025] In any of the above embodiments, optionally, the bearing includes a main bearing disposed on one side of the cylinder. Further, the pump body assembly also includes a secondary bearing disposed on the side of the cylinder away from the main bearing, with the other end of the crankshaft supported and mounted on the secondary bearing.

[0026] In this embodiment, the bearing is the main bearing, located near the drive motor side (typically at the crankshaft input end), and is primarily used to bear the main radial load of the crankshaft. In this embodiment, a connecting channel is provided on the main bearing to relieve pressure in the first cavity.

[0027] Furthermore, a connecting channel can also be provided on the secondary bearing (that is, the bearing in the first aspect embodiment can also be a secondary bearing) for pressure relief. That is, the connecting channel can be provided only on the main bearing, or it can be provided on both the main bearing and the secondary bearing.

[0028] The second aspect of this application provides a compressor that includes the pump assembly provided in any of the first aspects.

[0029] The compressor proposed according to the technical solution of this application, since it includes the pump body assembly provided by any of the technical solutions of the first aspect, therefore, has all the beneficial effects of the pump body assembly provided by any of the technical solutions of the first aspect. Further details will not be elaborated here.

[0030] Optionally, the compressor is a rotary compressor. Rotary compressors can be specifically used in refrigeration equipment such as refrigerators and air conditioners.

[0031] The third aspect of this application provides a refrigeration device, comprising: a pump assembly provided by any of the technical solutions in the first aspect; or a compressor provided by any of the technical solutions in the second aspect.

[0032] The refrigeration equipment of this application, since it includes the pump body assembly provided by any of the technical solutions in the first aspect or the compressor provided by any of the technical solutions in the second aspect, therefore has all the beneficial effects of the pump body assembly provided by any of the technical solutions in the first aspect or the compressor provided by any of the technical solutions in the second aspect. Further details will not be elaborated here.

[0033] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0034] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0035] Figure 1 This is one of the structural schematic diagrams of the bearing in the relevant scheme;

[0036] Figure 2 This is the second structural schematic diagram of the bearing in the relevant scheme.

[0037] in, Figure 1 and Figure 2 The accompanying figure labels are as follows:

[0038] 1' Bearing.

[0039] Figure 3 This is one of the structural schematic diagrams of a bearing according to an embodiment of this application;

[0040] Figure 4 This is a second schematic diagram of the structure of a bearing according to an embodiment of this application;

[0041] Figure 5 This is the third schematic diagram of the bearing structure according to an embodiment of this application;

[0042] Figure 6 This is the fourth schematic diagram of the structure of a bearing according to an embodiment of this application;

[0043] Figure 7 This is the fifth schematic diagram of the structure of a bearing according to an embodiment of this application;

[0044] Figure 8 This is the sixth schematic diagram of the bearing structure according to an embodiment of this application;

[0045] Figure 9 This is one of the structural schematic diagrams of a pump body assembly according to an embodiment of this application;

[0046] Figure 10 This is a second schematic diagram of the pump body assembly according to an embodiment of this application;

[0047] Figure 11This is one of the structural schematic diagrams of a compressor according to an embodiment of this application;

[0048] Figure 12 This is a second schematic diagram of the compressor according to an embodiment of this application.

[0049] in, Figures 3 to 12 The accompanying figure labels are as follows:

[0050] 100 Pump body assembly, 1 bearing, 12 connecting channel, 122 first end, 124 second end, 14 shaft hole, 16 annular groove, 18 first surface, 19 second surface, 2 cylinder, 3 crankshaft, 32 eccentric part, 34 thrust protrusion, 4 piston, 42 mounting hole, 5 first cavity, 6 muffler cover, 7 muffler cavity, 8 main bearing, 9 auxiliary bearing, 200 compressor. Detailed Implementation

[0051] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated 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 application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0052] The pump assembly, compressor, and refrigeration equipment according to embodiments of this application will now be described with reference to the accompanying drawings.

[0053] like Figures 3 to 10 As shown, an embodiment of the first aspect of this application provides a pump body assembly 100, including a cylinder 2, a bearing 1, a crankshaft 3, a piston 4, and a muffler cover 6. The bearing 1 is disposed on one side of the cylinder 2. A portion of the crankshaft 3 is located within the cylinder 2, with one end of the crankshaft 3 passing through the cylinder 2 and mounted within the bearing 1. The piston 4 is located within the cylinder 2 and mounted on the crankshaft 3. The piston 4, bearing 1, and crankshaft 3 form a first cavity 5. The muffler cover 6 is mounted on the side of the bearing 1 away from the cylinder 2, forming a muffler cavity 7 with the bearing 1. The bearing 1 has a communicating channel 12, with a first end 122 for communicating with the muffler cavity 7 and a second end 124 for communicating with the first cavity 5.

[0054] The pump assembly 100 of this application is used in a compressor, which can be a rotary compressor. The pump assembly 100 includes a cylinder 2, a bearing 1, a crankshaft 3, a piston 4, and a muffler cover 6. The crankshaft 3 passes through the cylinder 2, and its two ends are supported and mounted on the main bearing 8 and the auxiliary bearing 9 on both sides of the cylinder 2. In this embodiment of the application, the bearing 1 can be either the main bearing 8 or the auxiliary bearing 9. With this pump assembly 100, the rotation of the crankshaft 3 drives the piston 4 to rotate eccentrically within the cylinder 2, thereby achieving intake and exhaust. The muffler cover 6 is installed on the end face of the bearing 1 that does not contact the cylinder 2, forming a muffler cavity 7 with the bearing 1. Simultaneously, the bearing 1 is provided with a connecting channel 12, which connects the muffler cavity 7 and the first cavity 5 (formed by the piston 4, bearing 1, and crankshaft 3). This structure allows the inner side of the piston 4 to communicate with the silencer chamber 7 through the connecting channel 12. This allows the refrigerant oil inside the piston 4 to enter the silencer chamber 7 through the connecting channel 12, thereby reducing the pressure inside the piston 4 and decreasing the pressure difference between the inner and outer sides of the piston 4 (i.e., the suction chamber and the exhaust chamber). This makes it less likely for the medium in the suction chamber and the exhaust chamber to leak from the end face of the piston 4 into the first cavity 5. This effectively reduces leakage losses at the end face of the piston 4, improves the volumetric efficiency and indicated efficiency of the entire pump assembly 100, and thus improves the compressor's energy efficiency.

[0055] In any of the above embodiments, optionally, as Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, the bearing 1 includes a first surface 18 disposed away from the cylinder 2 and a second surface 19 disposed close to the cylinder 2. A connecting channel 12 extends from the first surface 18 to the second surface 19, such that the opening of the second end 124 of the connecting channel 12 is disposed on the second surface 19, and along the radial direction of the bearing 1, the first end 122 of the connecting channel 12 is located outside the second end 124 of the connecting channel 12.

[0056] In this embodiment, the connecting channel 12 extends from one end face of the bearing 1 to the other end face of the bearing 1, that is, the connecting channel 12 penetrates the entire bearing 1 in the axial direction. It can also be understood that the opening of the first end 122 of the connecting channel 12 is located on the first surface 18, and the opening of the second end 124 of the connecting channel 12 is located on the second surface 19. This arrangement allows the silencing chambers 7 on both sides of the bearing 1 and the first cavity 5 to be directly connected, thereby reducing the length of the connecting channel 12, shortening the pressure relief path, and making it easier for the refrigerant oil in the first cavity 5 to flow into the silencing chamber 7. Simultaneously, when designing the connecting channel 12, the second end 124 (i.e., the inlet end) of the connecting channel 12 can be positioned inwards, and the first end 122 (i.e., the outlet end) of the connecting channel 12 can be positioned outwards. This allows the second end 124 of the connecting channel 12 to be closer to the inner side of the bearing 1, thus facilitating the sealing of the second end 124 of the connecting channel 12 by the piston 4, preventing the second end 124 of the connecting channel 12 from being directly connected to the exhaust chamber or intake chamber.

[0057] Of course, when a recess is provided on the first surface 18 or the second surface 19 of the bearing 1, the side wall and bottom wall of the recess constitute part of the surface of the bearing 1. In this case, the openings at both ends of the connecting channel 12 can also be directly provided on the side wall or bottom wall of the recess.

[0058] In any of the above embodiments, optionally, as Figure 3 and Figure 6 As shown, the connecting channel 12 extends from the second end 124 to the first end 122, gradually tilting outward along the radial direction of the bearing 1.

[0059] In this embodiment, the connecting channel 12 is inclined, that is, the connecting channel 12 gradually slopes outward. This arrangement makes the connecting channel 12 a straight path, thereby shortening the length of the connecting channel 12 and the pressure relief path, so that the refrigerant oil in the first cavity 5 can flow more easily into the silencing cavity 7.

[0060] In other solutions, the connection channel can also be configured as a stepped structure.

[0061] In any of the above embodiments, optionally, as Figure 6 , Figure 7 and Figure 8 As shown, an annular groove 16 is provided on the surface of the bearing 1 near the cylinder 2. The annular groove 16 is arranged in a ring around the circumference of the shaft hole 14 of the bearing 1. The connecting channel 12 is located outside the annular groove 16 along the radial direction of the bearing 1.

[0062] In this embodiment, the reliability of the bearing 1 can be improved by providing an annular groove 16 on the lower surface of the bearing 1. When the annular groove 16 is provided on the bearing 1, the connecting channel 12 is located outside the annular groove 16.

[0063] In any of the above embodiments, optionally, as Figure 6 and Figure 7 As shown, the second end 124 of the connecting channel 12 is connected to the annular groove 16.

[0064] In this embodiment, the second end 124 (inlet end) of the connecting channel 12 is directly connected to the annular groove 16. For example, the opening of the second end 124 of the connecting channel 12 is set on the side wall of the annular groove 16, so that the connecting channel 12 can be set closer to the center of the bearing 1, so that the connecting channel 12 can be better closed by the piston 4.

[0065] In any of the above embodiments, optionally, as Figure 3 , Figure 6 , Figure 9 and Figure 10 As shown, the outer diameter of piston 4 is D (D = 2R). When piston 4 is installed on crankshaft 3, the eccentricity of piston 4 is e. The distance between the outer side of the second end 124 of the connecting channel 12 and the center line a of bearing 1 is L, where L is less than Re.

[0066] In this embodiment, since the piston 4 is eccentrically mounted, in order to prevent the second end 124 of the connecting channel 12 from communicating with the exhaust chamber or the intake chamber during the rotation of the piston 4, it is necessary to ensure that the second end 124 of the connecting channel 12 is always located inside the outer side wall of the piston 4 when the piston 4 is rotated to any angle. This ensures that the inlet end of the connecting channel 12 can always be closed by the piston 4 during the rotation of the piston 4, so as to prevent the medium in the exhaust chamber or the intake chamber from leaking from the connecting channel 12.

[0067] By setting L to be less than Re, it can be ensured that the second end 124 of the connecting channel 12 is always located inside the outer wall of the piston 4 when the piston 4 is rotated to any angle. This effectively prevents the medium in the exhaust chamber or intake chamber from leaking out of the connecting channel 12.

[0068] In any of the above embodiments, optionally, as Figure 9 and Figure 10 As shown, the crankshaft 3 is provided with an eccentric part 32 and a thrust protrusion 34, and the piston 4 is provided with a mounting hole 42. The piston 4 is mounted on the eccentric part 32 through the mounting hole 42. The thrust protrusion 34 is located on the side of the eccentric part 32 near the bearing 1. The first cavity 5 is formed by the inner wall of the mounting hole 42, the eccentric part 32, the outer side of the thrust protrusion 34 and the bearing 1.

[0069] In this embodiment, an eccentric portion 32 is provided on the crankshaft 3, and the piston 4 is mounted on the eccentric portion 32 and can rotate with the crankshaft 3. The crankshaft 3 drives the piston 4 to rotate via the eccentric portion 32, thereby changing the volume of the exhaust chamber and the intake chamber, thus compressing the medium. Furthermore, to ensure the installation stability of the piston 4, a thrust protrusion 34 is provided on the crankshaft 3. The thrust protrusion 34 can cooperate with the bearing 1 to limit the axial movement of the crankshaft 3. The first cavity 5 is formed by the inner wall of the mounting hole 42, the eccentric portion 32, the outer surface of the thrust protrusion 34, and the bearing 1.

[0070] In any of the above embodiments, optionally, as Figure 9 and Figure 10 As shown, bearing 1 includes a main bearing 8, which is disposed on one side of cylinder 2. Furthermore, pump body assembly 100 also includes a secondary bearing 9, which is disposed on the side of cylinder 2 away from the main bearing 8, and the other end of crankshaft 3 is supported and mounted on the secondary bearing 9.

[0071] In this embodiment, bearing 1 is the main bearing 8, which is located near the drive motor side (usually at the input end of crankshaft 3) and is mainly used to bear the main radial load of crankshaft 3. In this embodiment, a connecting channel 12 is provided on the main bearing 8 to relieve pressure in the first cavity 5.

[0072] Furthermore, a connecting channel 12 can also be provided on the auxiliary bearing 9 (that is, the bearing 1 in the first aspect embodiment can also be the auxiliary bearing 9) for pressure relief. That is, the connecting channel 12 can be provided only on the main bearing 8, or it can be provided on both the main bearing 8 and the auxiliary bearing 9.

[0073] like Figure 11 and Figure 12 As shown, an embodiment of the second aspect of this application provides a compressor 200, including the pump assembly 100 provided in any embodiment of the first aspect.

[0074] The compressor 200 according to the embodiments of this application, since it includes the pump body assembly 100 provided in any embodiment of the first aspect, has all the beneficial effects of the pump body assembly 100 provided in any embodiment of the first aspect. Further details will not be elaborated here.

[0075] Optionally, the compressor is a rotary compressor. Rotary compressors can be specifically used in refrigeration equipment such as refrigerators and air conditioners.

[0076] in, Figure 11 This is a schematic diagram of the compressor with bearing 1 without annular groove 16. Figure 12 This is a schematic diagram of the structure of a compressor with bearing 1 and annular groove 16.

[0077] An embodiment of the third aspect of the present application provides a refrigeration device (not shown in the figure), including: the pump body assembly provided in any embodiment of the first aspect; or the compressor provided in any embodiment of the second aspect.

[0078] For the refrigeration device of the present application, since it includes the pump body assembly provided in any embodiment of the first aspect or the compressor provided in any embodiment of the second aspect, therefore, it has all the beneficial effects of the pump body assembly provided in any embodiment of the first aspect or the compressor provided in any embodiment of the second aspect. Details are not described herein again.

[0079] A specific upper bearing and pump body assembly will be described below.

[0080] This embodiment belongs to the technical field of refrigeration devices. Specifically, it relates to an upper bearing and a pump body assembly.

[0081] In the loss distribution of the capacity of a rotary compressor, the leakage loss accounts for about 40% - 50%, and the leakage at the piston end face accounts for 30% - 40% of the total leakage loss. Therefore, reducing the leakage at the piston end face is one of the effective ways to improve the energy efficiency of the compressor.

[0082] The purpose of this embodiment is to provide an upper bearing and a pump body assembly to solve the problem of serious leakage loss in the existing compressor technology.

[0083] Among them, the structure of the bearing 1' in the related solution is as Figure 1 and Figure 2 shown. Among them, Figure 1 the bearing 1' in Figure 2 does not have an annular groove.

[0084] This embodiment provides an upper bearing. The upper bearing is provided with a radially communicating hole (communication channel 12). The inlet of the radially communicating hole is communicated with the cavity (first cavity 5) formed by the inner circle of the piston 4 and the upper thrust outer circle of the crankshaft 3. The outlet of the communicating hole is communicated with the cavity formed by the upper bearing and the upper muffler. The refrigerating oil enters the radially communicating hole of the upper bearing from the cavity formed by the inner circle of the piston and the upper thrust outer circle of the crankshaft, and then flows into the cavity formed by the upper bearing and the upper muffler. Finally, it enters the compressor interior through the outlet of the upper muffler, reducing the pressure difference between the cavity formed by the inner circle of the piston and the upper thrust outer circle of the crankshaft and the cylinder suction and exhaust cavities, achieving the effect of reducing the leakage loss at the piston end face, improving the volumetric efficiency and the indicated efficiency, and thus improving the energy efficiency of the compressor.

[0085] Furthermore, the radially communicating hole of the upper bearing is arranged inside the outer wall surface of the piston to prevent leakage, that is, L < R - e. Here, R is the radius of the outer side wall of the piston, and e is the eccentricity after the piston is installed.

[0086] Furthermore, the cavity formed by the inner circle of the piston and the outer circle of the crankshaft thrust, the connecting hole of the upper bearing, the cavity formed by the upper bearing and the upper muffler, and the upper muffler together form an oil draining structure. This structure allows refrigerant oil to enter the compressor from the oil draining structure, reducing the refrigerant oil pressure in the cavity formed by the inner circle of the piston and the outer circle of the crankshaft thrust, thereby reducing piston end face leakage and improving compressor energy efficiency.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0088] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A pump body assembly, characterized in that, include: cylinder; A bearing, wherein the bearing is disposed on one side of the cylinder; A crankshaft, a portion of which is located within the cylinder, with one end of the crankshaft passing through the cylinder and mounted within the bearing; A piston, located inside the cylinder and mounted on the crankshaft, the piston, the bearing, and the crankshaft forming a first cavity; A muffler cover is installed on the side of the bearing away from the cylinder, forming a muffler cavity with the bearing; The bearing is provided with a connecting channel, the first end of which is used to connect to the silencing cavity, and the second end of which is used to connect to the first cavity.

2. The pump body assembly according to claim 1, characterized in that, The bearing includes a first surface disposed away from the cylinder and a second surface disposed close to the cylinder, the connecting channel extending from the second surface to the first surface and along the radial direction of the bearing, and the first end of the connecting channel being located outside the second end of the connecting channel.

3. The pump body assembly according to claim 2, characterized in that, The connecting channel extends from the second end to the first end, gradually tilting outward along the radial direction of the bearing.

4. The pump body assembly according to any one of claims 1 to 3, characterized in that, An annular groove is provided on the surface of the bearing near the cylinder, and the annular groove is arranged in a ring around the circumference of the shaft hole of the bearing. The connecting channel is located outside the annular groove along the radial direction of the bearing.

5. The pump body assembly according to claim 4, characterized in that, The second end of the connecting channel is connected to the annular groove.

6. The pump body assembly according to any one of claims 1 to 3, characterized in that, The piston has an outer diameter of D, and when mounted on the crankshaft, the piston's eccentricity is e. The distance between the outer side of the second end of the connecting channel and the centerline of the bearing is L, where L is less than...

7. The pump body assembly according to any one of claims 1 to 3, characterized in that, The crankshaft is provided with an eccentric part and a thrust protrusion, the piston is provided with a mounting hole, the piston is mounted on the eccentric part through the mounting hole, and the thrust protrusion is located on the side of the eccentric part closer to the bearing; The first cavity is formed by the inner wall of the mounting hole, the eccentric portion, the outer side of the thrust protrusion, and the bearing.

8. The pump body assembly according to any one of claims 1 to 3, characterized in that, The bearing includes a main bearing disposed on one side of the cylinder. The pump assembly also includes a secondary bearing disposed on the side of the cylinder away from the main bearing. The other end of the crankshaft is supported and mounted on the secondary bearing.

9. A compressor, characterized in that, Includes the pump body assembly as described in any one of claims 1 to 8.

10. A refrigeration device, characterized in that, include: Pump body assembly as described in any one of claims 1 to 8; or The compressor as described in claim 9.

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