CN217761309U - Pump body subassembly, compressor and refrigeration plant - Google Patents

Abstract

The utility model discloses a pump body subassembly, compressor and refrigeration plant, pump body subassembly includes: the engine comprises a cylinder, a crankshaft and a piston, wherein a main bearing and an auxiliary bearing are respectively arranged on two opposite sides of the cylinder along the axial direction; the crankshaft comprises a shaft part and an eccentric part, the shaft part is sleeved with the main bearing and the auxiliary bearing, and the eccentric part is arranged between the main bearing and the auxiliary bearing; the piston is sleeved on the eccentric part and arranged between the main bearing and the auxiliary bearing; at least one of the main bearing and the auxiliary bearing comprises a bearing body and a bushing, a matching groove matched with the bushing is formed in the crankshaft, and the bushing is rotatably embedded into the matching groove. By applying the technical scheme, the height of the pump body assembly can be reduced while the working performance is ensured.

Description

Pump body subassembly, compressor and refrigeration plant

Technical Field

The utility model relates to the field of refrigeration technology, especially, relate to a pump body subassembly, have the compressor of this pump body subassembly and have the refrigeration plant of this compressor.

Background

The compressor is a driven fluid machine for raising low-pressure gas into high-pressure gas, and with the trend of miniaturization of client systems, the height of the compressor matched with the compressor is required to be reduced. In the related art, most of the miniaturization technical means of the rotary compressor are size miniaturization, and further the size of each part is reduced, so that the rigidity of a part of the structure is reduced, and the reliability of the compressor is reduced due to the problems of aggravation of deformation of a bearing assembly plane, increase of stress of a shaft system, increase of assembly deformation and the like.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to provide a pump body assembly, which can reduce the height of the pump body assembly while ensuring the working performance.

Another object of the present invention is to provide a compressor, which includes the pump body assembly.

A further object of the present invention is to provide a refrigeration device, including the aforementioned compressor.

According to the utility model discloses pump body subassembly, include: the crankshaft is arranged on the cylinder, and the main bearing and the auxiliary bearing are respectively arranged on two opposite sides of the cylinder along the axial direction; the crankshaft comprises a shaft part and an eccentric part, the shaft part is sleeved with the main bearing and the auxiliary bearing, and the eccentric part is arranged between the main bearing and the auxiliary bearing; the piston is sleeved on the eccentric part and arranged between the main bearing and the auxiliary bearing; at least one of the main bearing and the auxiliary bearing comprises a bearing body and a bushing, a matching groove matched with the bushing is formed in the crankshaft, and the bushing is rotatably embedded into the matching groove.

According to the utility model discloses pump body subassembly can reduce pump body subassembly's height when guaranteeing working property.

In addition, according to the present invention, the pump body assembly according to the above embodiment may further have the following additional technical features:

in some examples of the present invention, the engagement groove is provided on an end surface of the eccentric portion and extends in an axial direction of the cylinder.

In some examples of the present invention, the bushing is sleeved on the shaft portion and embedded in the mating groove, and the bearing body is sleeved on the bushing.

In some examples of the invention, the mating groove depth is t1, the bushing extends out of the height of the inner side surface of the bearing body is t2, wherein t1 > t2.

In some examples of the invention, t2 is in the range of 3 mm to 5mm.

In some examples of the invention, t1-t2 is in the range of 0.2 mm to 0.5 mm.

In some examples of the invention, the outer circumference of the bushing is spaced apart from the outer circumference within the mating groove.

In some examples of the invention, the inner circumferential surface of the bushing is spaced apart from the inner circumferential surface of the mating groove.

In some examples of the invention, the diameter dimension of the outer circumference in the mating groove is D1 and the diameter dimension of the outer circumference of the bushing is D2, wherein D1/2-D2/2 is in the range of 0.3 mm to 0.5 mm.

In some examples of the present invention, the piston is provided with an avoiding groove on an inner peripheral surface thereof, the avoiding groove being adapted to the bush, and the inner peripheral surface of the avoiding groove is spaced apart from an outer peripheral surface of the bush.

In some examples of the invention, the depth dimension of the avoidance groove is equal to the depth dimension of the mating groove.

In some examples of the invention, the diameter dimension of the outer circumferential surface of the bushing is D2, the eccentricity of the eccentric portion is e, the diameter dimension of the inner circumferential surface of the avoiding groove is D3, wherein D3/2-D2/2-e is in the range of 0.3 mm to 0.5 mm.

In some examples of the invention, the shaft portion includes a main shaft and a secondary shaft, the main shaft is embedded in the main bearing, and the secondary shaft is embedded in the secondary bearing, a diameter dimension of the secondary shaft is smaller than a diameter dimension of the main shaft, the secondary bearing is provided with the bushing.

According to the utility model discloses compressor, include according to aforementioned pump body subassembly.

According to the utility model discloses the compressor can reduce the height of compressor, realizes that the compressor is miniaturized.

According to the utility model discloses refrigeration plant, including aforementioned compressor.

According to the utility model discloses refrigeration plant can reduce the space that the compressor occupy, does benefit to spatial arrangement.

Drawings

Fig. 1 is a schematic diagram of a pump body assembly according to some embodiments of the present invention.

Fig. 2 is an enlarged view at a in fig. 1.

Fig. 3 is a schematic view of the main bearing according to some embodiments of the present invention.

Figure 4 is a cross-sectional view of a main bearing according to some embodiments of the present invention.

Fig. 5 is a schematic view of a crankshaft according to some embodiments of the present invention.

Fig. 6 is a cross-sectional view of a crankshaft in some embodiments of the invention.

Fig. 7 is a partial schematic view of an eccentric portion in some embodiments of the invention (showing the mating grooves in the form of rings).

Fig. 8 is a cross-sectional view of a crankshaft in accordance with other embodiments of the present invention.

Fig. 9 is a partial schematic view of an eccentric portion according to other embodiments of the present invention (showing the mating grooves in the shape of a crescent).

Fig. 10 is a cross-sectional view of a piston according to some embodiments of the present invention.

Fig. 11 is a schematic structural view of a pump body in the related art.

Reference numerals are as follows:

100. a pump body assembly; 101. a mating groove; 102. an avoidance groove; 103. a central oil hole; 104. a side oil hole; 105. mounting holes; 10. a crankshaft; 12. an eccentric portion; 121. a thrust surface; 11. a shaft portion; 111. a main shaft; 112. a counter shaft; 20. a cylinder; 30. a piston; 40. a secondary bearing; 41. a body; 42. a bushing; 43. assembling a plane; 50. a main bearing; 60. a bearing muffler;

10', a crankshaft; 40' and a lower bearing.

Detailed Description

Based on above-mentioned technical condition among the correlation technique, the utility model provides a pump body subassembly 100, in this application, main bearing 50 and auxiliary bearing 40 keep bearing length unchangeable, under the prerequisite of guaranteeing that bearing assembly face and bent axle 10 rigidity do not weaken, be the components of a whole that can function independently structure with the bearing design, form by bearing body 41 and bearing bush 42 assembly, bearing bush 42 outer salient bearing assembly plane 43 and bent axle 10 are at thrust surface 121 position design cooperation groove 101, cooperation groove 101 is suitable for and corresponds with bearing bush 42 salient position. On the premise of ensuring the reliability of the compressor, the height of the pump body assembly can be reduced by 3-5 mm through measurement.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.

With reference to fig. 1 to 10, a pump body assembly 100 according to an embodiment of the present invention includes: the crankshaft 10, the cylinder 20, and the piston 30, specifically, the cylinder 20 is provided with a main bearing 50 and an auxiliary bearing 40 at opposite sides in an axial direction, respectively; the crankshaft 10 comprises a shaft part 11 and an eccentric part 12, the shaft part 11 is sleeved with the main bearing 50 and the auxiliary bearing 40, the eccentric part 12 is arranged between the main bearing 50 and the auxiliary bearing 40, and the bearings can improve the smooth rotation of the crankshaft 10 and improve the operation stability; the piston 30 is sleeved on the eccentric portion 12 and is arranged between the main bearing 50 and the auxiliary bearing 40, and the piston 30 can drive the eccentric portion 12 to rotate so as to compress the gas. At least one of the main bearing 50 and the sub bearing 40 includes a bearing body 41 and a bush 42, the crankshaft 10 is provided with a fitting groove 101 adapted to the bush 42, and the bush 42 is rotatably fitted into the fitting groove 101.

That is, when the crankshaft 10 is coupled to the main bearing 50 or the auxiliary bearing 40, the bearing may be rotatably coupled to the crankshaft 10 by being embedded, i.e., the bushing 42 of the bearing may be embedded in the crankshaft 10. The crankshaft 10 can extend into the bushing 42, and the bushing 42 can be embedded into the crankshaft 10, so that the stability of the cooperation of the crankshaft 10 and the bushing 42 can be improved, and thus, under the condition that the lengths of the crankshaft 10, the main bearing 50 and the auxiliary bearing 40 are not changed, the rigidity of the bearing assembly surface and the crankshaft 10 cannot be weakened, the height of the pump body assembly 100 can be properly reduced, and the structure is simple and easy to construct.

According to the utility model discloses pump body subassembly 100 through construct cooperation groove 101 on bent axle 10 to with main bearing 50 or auxiliary bearing 40's bush 42 embedding cooperation groove 101 in, can reduce the height of pump body subassembly 100 when guaranteeing pump body subassembly 100 working property.

In practical use, referring to fig. 1 and 2, taking the example that the auxiliary bearing 40 includes the body 41 and the bushing 42, the bushing 42 can be inserted into the fitting groove 101 of the crankshaft 10, so as to realize the rotational connection between the auxiliary bearing 40 and the crankshaft 10. Fig. 11 shows a schematic view of a pump body 'in the related art, and it can be seen that the crankshaft 10' in the related art directly protrudes into the lower bearing 40', and therefore, in order to secure the fitting strength between the crankshaft 10' and the lower bearing 40 'and the rigidity of the mounting surface of the lower bearing 40' and the crankshaft 10', the lower bearing 40' is constructed in an integrally formed "T" shape, but the structure occupies a large space in the height direction. And the pump body assembly 100 of the embodiment of the present invention, by providing the bushing 42 on the bearing, the bushing 42 is embedded into the matching groove 101 to connect the bearing and the crankshaft 10, so as to reduce the volume of the bearing while ensuring the connection stability.

With reference to fig. 5, in some examples of the present invention, the fitting groove 101 is provided on the end surface of the eccentric portion 12 and extends in the axial direction of the cylinder 20, and the bush 42 can rotate synchronously with the eccentric portion 12 after being inserted into the fitting groove 101, and is simple in structure and easy to construct.

For example, the engaging groove 101 may be disposed on an end surface of the eccentric portion 12 facing the auxiliary bearing 40, so as to be adapted to engage with the bushing 42 of the auxiliary bearing 40; the fitting groove 101 may be provided on an end surface of the eccentric portion 12 facing the main bearing 50 to be adapted to fit with the bush 42 of the main bearing 50. Of course, the main bearing 50 and the sub bearing 40 may have the bush 42, the fitting groove 101 may be provided on both end surfaces of the eccentric portion 12, and the bush 42 may be fitted into the fitting groove 101 to be connected to the eccentric portion 12.

Referring to fig. 2 and 3, in some embodiments of the present invention, the bush 42 is sleeved on the shaft portion 11 and inserted into the fitting groove 101, and the bearing body 41 is sleeved on the bush 42. That is, after the body 41 of the bearing is fitted with a portion of the bush 42, another portion of the bush 42 may be stacked with the eccentric portion 12, and the bush 42 protrudes from the body 41, and a portion of the bush 42 higher than the body 41 may be fitted into the fitting groove 101 of the eccentric portion 12. Therefore, when the bush 42 is inserted into the engagement groove 101, the bush 42 can be fitted into the eccentric portion 12, and the end surface of the bearing body 41 can be attached to the end surface of the eccentric portion 12, so that the engagement strength between the bearing and the shaft portion 11 can be improved, and the bearing volume can be reduced.

With reference to fig. 3 and 4, according to the pump body assembly 100 of the embodiment of the present invention, the auxiliary bearing 40 includes a body 41 and a bushing 42, the rotation central axis of the body 41 is hollow, the body 41 is substantially circular, the inner circle of the body 41 is sleeved on the bushing 42, wherein the bushing 42 is higher than the body 41. The portion of the bushing 42 higher than the body 41 is adapted to be fitted into the fitting groove 101 of the eccentric portion 12. That is, the bush 42 can connect the crankshaft 10 and the bearing body 41, and the rigidity of the body 41 and the crankshaft 10 is not weakened, so that the stability is high. Further, the outer circumferential surface of the body 41 forms an assembly plane 43, the assembly plane 43 can improve the rigidity of the bearing and the crankshaft 10, and the assembly plane 43 is provided with a plurality of mounting holes 105 for assembly. Alternatively, the body 41 and the bushing 42 may be assembled by cold pressing. That is, the auxiliary bearing 40 is substantially in an inverted "T" shape, the bushing 42 protruding from the body 41 can be inserted into the fitting groove 101, and a side of the auxiliary bearing 40 away from the eccentric portion 12 is a plane, so that the auxiliary bearing is convenient for spatial arrangement during use, and is beneficial to reducing the height or volume of the pump body assembly 100.

With reference to fig. 6, in some embodiments of the present invention, the depth of the engaging groove 101 is t1, and the height of the bushing 42 extending out of the inner side surface of the bearing body 41 is t2, where t1 > t2. In other words, the depth of the fitting groove 101 may be greater than the height of the bushing 42 extending out of the main body 41, when the bushing 42 is inserted into the fitting groove 101, on one hand, the portion of the bushing 42 extending out of the bearing main body 41 may be completely inserted into the fitting groove 101, and the bearing main body 41 and the eccentric portion 12 may be tightly fitted to each other, thereby improving the tightness of the overall connection of the pump body assembly 100; on the other hand, the bush 42 has a clearance from the end surface of the engagement groove 101 after being inserted into the engagement groove 101, and the rotational flexibility can be improved, thereby improving the functionality of the pump body assembly 100.

Further, in conjunction with fig. 2, the height (t 2) of the bush 42 protruding from the inner side surface of the bearing body 41 may be in a range of 3 mm to 5mm to ensure connection stability and facilitate reduction in volume. For example, t2 may be 4 millimeters, 4.5 millimeters, 5 millimeters, or the like; of course, t2 may also be set to 2 mm or 6 mm, etc. according to actual situations, and the present invention is not limited thereto.

Further, in some embodiments of the present invention, t1-t2 may be in a range of 0.2 mm to 0.5 mm, that is, after the bushing 42 is inserted into the fitting groove 101, a gap between the bushing 42 and the end surface of the fitting groove 101 or a difference between t1 and t2 may be 0.2 mm to 0.5 mm, for example, 0.3 mm or 0.4 mm, etc., and of course, the difference between t1-t2 may also be 0.1 mm or 0.6 mm, etc. according to actual use conditions.

With reference to fig. 2, in some embodiments of the present invention, the outer circumferential surface of the bushing 42 is spaced from the outer circumferential surface of the mating groove 101 to improve rotational flexibility and thus functionality of the pump body assembly 100.

The inner circumferential surface of the bush 42 may be spaced from the inner circumferential surface of the fitting groove 101; the outer and inner circumferential surfaces of the bushing 42 are spaced apart from the inner and outer circumferential surfaces of the fitting groove 101, so that wear between the bearing and the crankshaft 10 is reduced, the local occurrence of the bearing burnishing can be reduced, and the compressor operation is more reliable.

Specifically, in some embodiments of the present invention, with reference to fig. 4 and 6, the diameter of the outer circumferential surface in the fitting groove 101 is D1, and the diameter of the outer circumferential surface of the bushing 42 is D2, wherein D1/2-D2/2 is in the range of 0.3 mm to 0.5 mm, or the difference between the size of the radius of the outer circumferential surface in the fitting groove 101 and the size of the radius of the outer circumferential surface of the bushing 42 is in the range of 0.3 mm to 0.5 mm. In other words, the diameter of the outer peripheral surface of the fitting groove 101 is larger than the diameter of the outer peripheral surface of the bush 42, and when the bush 42 is fitted into the fitting groove 101, the clearance between the fitting groove 101 and the bush 42 satisfies the above formula, whereby the dimension of the bush 42 or the fitting groove 101 can be calculated by the above relational expression in actual use. For example, D1/2-D2/2 is 0.35 mm or 0.4 mm, etc. Alternatively, D1/2-D2/2 may be 0.6 mm or 0.2 mm, etc. depending on the actual application.

With reference to fig. 10, in some embodiments of the present invention, the inner circumferential surface of the piston 30 is provided with an avoiding groove 102 adapted to the bushing 42, and the inner circumferential surface of the avoiding groove 102 is spaced apart from the outer circumferential surface of the bushing 42, so as to avoid the bushing 42 interfering with the avoiding groove 102, and improve the stability of operation.

In some embodiments of the present invention, the depth dimension of the avoidance groove 102 may be equal to the depth dimension of the mating groove 101.

With reference to fig. 6 and 8, in some embodiments of the present invention, the outer circumference of the bushing 42 has a diameter dimension D2, the eccentricity of the eccentric portion 12 is e, and the inner circumference of the escape slot 102 has a diameter dimension D3, wherein D3/2-D2/2-e is in the range of 0.3 mm to 0.5 mm. That is, the dimension of the inner peripheral surface of the escape groove 102 may be larger than the sum of the dimension of the outer peripheral surface of the bush 42 and the eccentricity e, and the escape effect may be improved. That is, the diameter dimension of the inner circumferential surface of the avoidance groove 102 may be equal to: the sum of the radius of the outer peripheral surface of the bush 42, the size of the eccentric shaft e, and the gap size (0.3 mm to 0.5 mm) can be calculated according to actual conditions during manufacturing to increase the fitting effect by avoiding the size of the groove 102.

Fig. 7 illustrates a mating groove 101 in some embodiments of the invention, the mating groove 101 may be an annular groove.

Alternatively, the eccentricity e of the eccentric portion 12 may be adjusted according to actual conditions. With reference to fig. 6 and 8, fig. 6 and 8 show a crankshaft 10 with different eccentrics 12 for two embodiments of the invention.

While the engagement groove 101 may have other shapes according to the change of the eccentricity of the eccentric portion 12, fig. 9 shows the engagement groove 101 according to other embodiments of the present invention, and when the outer circumferential surface of the eccentric portion 12 is tangent to the inner circumferential surface of the piston 30, the engagement groove 101 has a crescent shape.

With reference to fig. 5, in some embodiments of the present invention, the shaft portion 11 includes a main shaft 111 and a secondary shaft 112, the main shaft 111 is embedded in the main bearing 50, the secondary shaft 112 is embedded in the secondary bearing 40, a diameter of the secondary shaft 112 is smaller than a diameter of the main shaft 111, and the secondary bearing 40 is provided with a bushing 42.

With reference to fig. 1, in some embodiments of the present invention, the main bearing 50 includes a flange portion and a neck portion, the flange portion is substantially in a circular disc shape, the neck portion is substantially in a cylindrical shape, the neck portion is connected to the rotation center axis of the flange portion, the flange portion is located at the bottom end of the neck portion, and the main shaft 111 can pass through the neck portion and be sleeved with the main bearing. The neck portion and the flange portion may be integrally formed.

In some embodiments of the present invention, the pump body assembly 100 further includes a bearing muffler 60, and the bearing muffler 60 is sleeved on the main shaft 111 and located above the main bearing 50.

According to the utility model discloses compressor, through using aforementioned pump body subassembly 100 in the compressor, can reduce the height of compressor, realize the compressor miniaturization.

According to the utility model discloses refrigeration plant, refrigeration plant can be electrical apparatus such as air conditioner, refrigerator, and refrigeration plant uses the compressor of above-mentioned embodiment, can reduce the space that the compressor occupy, do benefit to spatial arrangement.

A pump body assembly 100 according to an embodiment of the present invention will be described with reference to the drawings.

Fig. 11 shows a technical solution of a pump body in the related art, which includes a crankshaft 10', an upper bearing muffler, an upper bearing, a cylinder, a sliding vane, a piston, and a lower bearing 40', wherein the lower bearing is an integrated structure, and a bearing hub protrudes out of a back surface of a bearing mounting surface.

With reference to fig. 1 to 10, a pump body assembly 100 according to an embodiment of the present invention includes: a crankshaft 10, a cylinder 20, a piston 30, and a bearing muffler 60, wherein the main bearing 50 and the sub bearing 40 are respectively provided at opposite sides of the cylinder 20 in an axial direction; the crankshaft 10 comprises a shaft part 11 and an eccentric part 12, wherein the shaft part 11 is sleeved with a main bearing 50 and an auxiliary bearing 40, and the eccentric part 12 is positioned between the main bearing 50 and the auxiliary bearing 40; the piston 30 is fitted to the eccentric portion 12.

Specifically, the auxiliary bearing 40 is a split assembly structure, the auxiliary bearing 40 includes a body 41 and a bushing 42, and the body 41 is sleeved on the bushing 42. The bearing body 41 is provided with an assembling plane 43, the assembling plane 43 is provided with screw holes, and the body 41 and the bush 42 are assembled by cold pressing. Wherein, the outer diameter dimension of the bush 42 is D2, and the height dimension t2 of the bush is higher than the assembling plane 43 of the bearing body 41, and t1-t2 is in the range of 0.2 mm to 0.5 mm.

Further, the crankshaft 10 includes a shaft portion 11 and an eccentric portion 12, wherein the shaft portion 11 includes a main shaft 111 and a sub shaft 112, and the sub shaft 112 is provided with a center oil hole 103 and a side oil hole 104; the end face of the eccentric portion 12 is provided with a fitting groove 101, and the fitting groove 101 is adapted to fit the aforementioned bush 42, and the bush 42 can be fitted into the fitting groove 101.

Specifically, after the bushing 42 is fitted into the fitting groove 101, a certain gap is provided between the top wall and the inner circumferential surface of the fitting groove 101 and the outer circumferential surface and the top surface of the bushing 42. Specifically, the depth of the engaging groove 101 is t1, the engaging groove 101 and the bush 42 are higher than the height dimension t2 of the bearing body 41, and the dimensional relationship between t1 and t2 after assembly is as follows: t1-t2 is in the range of 0.2 mm to 0.5 mm. The relationship between the dimension D1 of the diameter of the outer peripheral surface in the fitting groove 101 and the dimension D2 of the outer diameter of the bearing bush 42 is such that the difference D1-D2 is in the range of 0.3 mm to 0.5 mm. According to the above technical solution, after assembly, it is measured that the height of the pump body assembly 100 can be reduced by 3 to 5mm compared with the related art solution.

Further, an avoiding groove 102 adapted to the bush 42 is provided on the inner peripheral surface of the piston 30, for example, when the engaging groove 101 is circular arc-shaped, the depth of the avoiding groove 102 may be the same as the depth of the engaging groove 101, i.e., t1, and the diameter of the inner peripheral surface of the avoiding groove 102 is D3, wherein D3/2-D2/2-e is in the range of 0.3 mm to 0.5 mm. (the diameter of the outer peripheral surface of the bush 42 is D2, and the eccentricity of the eccentric portion 12 is e).

According to the utility model discloses pump body subassembly 100 through setting the bearing to the components of a whole that can function independently structure, can guarantee that bearing body 41 thickness is unchangeable, during the use, colds pressing into bearing body 41 with bush 42, and bush 42 is at bearing installation face direction evagination, and crankshaft 10 thrust surface 121 position corresponds and sets up cooperation groove 101, and bush 42 can imbed cooperation groove 101, can step down bush 42, does benefit to the height that reduces pump body subassembly 100.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (12)

1. A pump body assembly, comprising:

the main bearing and the auxiliary bearing are respectively arranged on two opposite sides of the cylinder along the axial direction;

the crankshaft comprises a shaft part and an eccentric part, the shaft part is sleeved with the main bearing and the auxiliary bearing, and the eccentric part is arranged between the main bearing and the auxiliary bearing;

the piston is sleeved on the eccentric part and arranged between the main bearing and the auxiliary bearing;

at least one of the main bearing and the auxiliary bearing comprises a bearing body and a bushing, a matching groove matched with the bushing is formed in the crankshaft, and the bushing is rotatably embedded into the matching groove.

2. The pump body assembly according to claim 1, wherein the fitting groove is provided on an end surface of the eccentric portion and extends in an axial direction of the cylinder.

3. The pump body assembly of claim 2, wherein the bushing is sleeved on the shaft portion and is embedded in the mating groove, and the bearing body is sleeved on the bushing.

4. The pump body assembly according to claim 2, wherein the mating groove has a depth t1, and the bushing has a height t2 from the inner side surface of the bearing body, wherein t1 > t2.

5. The pump body assembly according to claim 4, wherein t2 is in the range of 3 mm to 5 mm;

and/or, t1-t2 is in the range of 0.2 mm to 0.5 mm.

6. The pump body assembly of claim 2, wherein an outer circumferential surface of the bushing is spaced from an outer circumferential surface within the mating groove;

and/or the inner circumferential surface of the bushing is spaced apart from the inner circumferential surface of the fitting groove.

7. The pump body assembly of claim 2, wherein the outer circumferential surface within the mating groove has a diameter dimension D1 and the outer circumferential surface of the bushing has a diameter dimension D2, wherein D1/2-D2/2 is in a range of 0.3 mm to 0.5 mm.

8. The pump body assembly according to claim 1, wherein an escape groove is formed on an inner peripheral surface of the piston to fit the bushing, and an inner peripheral surface of the escape groove is spaced apart from an outer peripheral surface of the bushing.

9. The pump body assembly of claim 8, wherein a depth dimension of the avoidance slot is equal to a depth dimension of the mating slot;

and/or the diameter of the outer circumferential surface of the bushing is D2, the eccentricity of the eccentric part is e, and the diameter of the inner circumferential surface of the avoidance groove is D3, wherein D3/2-D2/2-e is in the range of 0.3 mm to 0.5 mm.

10. The pump body assembly according to any one of claims 1 to 9, wherein the shaft portion comprises a primary shaft and a secondary shaft, the primary shaft being embedded in the primary bearing and the secondary shaft being embedded in the secondary bearing, the secondary shaft having a smaller diametrical size than the primary shaft, the secondary bearing being provided with the bushing.

11. A compressor, characterized by comprising a pump body assembly according to any one of claims 1 to 10.

12. A refrigeration apparatus, comprising the compressor of claim 11.

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