Compression pump body structure and rotary compressor

Abstract

The utility model relates to a compression pump body structure and a rotary compressor, the compression pump body structure comprises an upper noise reduction cover, an upper pump body assembly, a partition middle plate, a lower pump body assembly and a lower noise reduction cover which are sequentially connected along the axial direction, an upper noise reduction chamber is formed between the upper noise reduction cover and the upper pump body assembly, and a lower noise reduction chamber is formed between the lower noise reduction cover and the lower pump body assembly. The upper pump body assembly, the partition middle plate and the lower pump body assembly are provided with double exhaust channels communicating with the upper silencing chamber and the lower silencing chamber in the axial direction in a penetrating mode. An upper exhaust channel and a lower exhaust branch channel are formed in the upper end and the lower end of the upper pump body assembly respectively, the upper exhaust channel communicates with the upper anechoic chamber, and the lower exhaust branch channel communicates with the double exhaust channels. An upper exhaust branch channel and a lower exhaust channel are formed in the upper end and the lower end of the lower pump body assembly respectively, the upper exhaust branch channel is communicated with the double exhaust channels, and the lower exhaust channel is communicated with the lower anechoic chamber. The air displacement can be effectively improved, and the exhaust resistance is reduced on the premise of ensuring the volume efficiency, so that the performance of the compressor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressor technical field, in particular to a kind of compression pump body structure and rotary compressor. BACKGROUND

[0002] Rotary compressor is the core component of air conditioner, refrigerant and other refrigeration cycle device, and rotary compressor is mainly driven by motor to drive crankshaft to drive piston to make eccentric rotation in cylinder chamber, to realize the compression operation of refrigerant.

[0003] According to the number of cylinder, rotary compressor can be generally divided into single-cylinder compressor and double-cylinder compressor, and the advantage of double-cylinder compressor compared with single-cylinder compressor is that its vibration frequency is greatly reduced. The pump body of double-cylinder compressor is generally composed of upper sound-absorbing cover, upper bearing, upper cylinder, middle plate, lower cylinder, lower bearing, lower sound-absorbing cover, crankshaft and piston, and its exhaust method adopts upper and lower cylinder single exhaust method. But because the leakage of double-cylinder compressor is twice that of single-cylinder machine, the exhaust resistance of double-cylinder compressor is increased, the efficiency is difficult to improve, and the energy efficiency of compressor body is greatly affected, which easily leads to the performance decline of compressor. SUMMARY

[0004] Therefore, the utility model discloses the purpose of overcoming the deficiency of prior art, providing a kind of compression pump body structure and rotary compressor, according to the compression pump body structure and rotary compressor of the utility model embodiment, the double exhaust passage of through design can effectively improve its exhaust capacity, reduce exhaust resistance under the premise of guaranteeing volumetric efficiency, to improve the performance of compressor.

[0005] In order to realize the above-mentioned purpose, the utility model embodiment provides a kind of compression pump body structure, including the upper sound-absorbing cover, upper pump body assembly, separation middle plate, lower pump body assembly, lower sound-absorbing cover connected in sequence along the axial direction, the upper sound-absorbing cover and the upper pump body assembly form upper sound-absorbing chamber, the upper sound-absorbing cover is equipped with the upper exhaust outlet being communicated with the upper sound-absorbing chamber, the lower sound-absorbing cover and the lower pump body assembly form lower sound-absorbing chamber, the upper pump body assembly, separation middle plate, lower pump body assembly are equipped with the double exhaust passage being communicated with the upper sound-absorbing chamber and the lower sound-absorbing chamber along the axial direction through opening;

[0006] The upper and lower ends of the upper pump body assembly are respectively equipped with upper exhaust passage, lower exhaust branch, the upper exhaust passage is communicated with the upper sound-absorbing chamber, and the lower exhaust branch is communicated with the double exhaust passage;The upper and lower ends of the lower pump body assembly are respectively equipped with upper exhaust branch, lower exhaust passage, the upper exhaust branch is communicated with the double exhaust passage, and the lower exhaust passage is communicated with the lower sound-absorbing chamber.

[0007] Therefore, according to the compression pump body structure, the double exhaust passages are arranged to penetrate the upper pump body assembly, the separation middle plate and the lower pump body assembly in the axial direction, the upper end of the upper pump body assembly is communicated with the upper sound attenuation chamber through the upper exhaust passage, the lower end of the upper pump body assembly is communicated with the double exhaust passage through the lower exhaust branch, the upper end of the lower pump body assembly is communicated with the double exhaust passage through the upper exhaust branch, and the lower end of the lower pump body assembly is communicated with the lower sound attenuation chamber through the lower exhaust passage, so that the upper pump body assembly and the lower pump body assembly can be exhausted in the upper and lower exhaust mode, the exhaust capacity of the entire compression pump body structure is effectively improved, the exhaust resistance is reduced under the premise of ensuring the volumetric efficiency, and the performance of the compressor is improved.

[0008] As an implementation form, the utility model also includes a crankshaft, the crankshaft is arranged in the upper sound attenuation cover, the upper pump body assembly, the separation middle plate, the lower pump body assembly and the lower sound attenuation cover in the axial direction, the crankshaft is provided with an upper piston and a lower piston, the upper piston is arranged in the upper pump body assembly, and the lower piston is arranged in the lower pump body assembly.

[0009] As an implementation form, the upper pump body assembly includes an upper bearing, an upper cylinder and a first middle plate which are sequentially connected in the axial direction, an upper inner cavity is arranged in the middle part of the upper cylinder in the axial direction, and the upper cylinder, the upper bearing and the first middle plate jointly enclose an upper compression chamber.

[0010] As an implementation form, the upper bearing is provided with an upper through hole which is communicated with the first exhaust incision in the axial direction, the upper end surface of the upper bearing is recessed and provided with an upper exhaust valve seat which is communicated with the upper sound attenuation chamber, one end of the upper through hole penetrates the upper exhaust valve seat, and the upper exhaust valve seat is provided with an upper exhaust valve plate which is arranged in the upper through hole and covers the upper through hole.

[0011] As an implementation form, the first middle plate is provided with a first through hole which is communicated with the second exhaust incision in the axial direction, the lower end surface of the first middle plate is recessed and provided with a first exhaust valve seat, the first through hole penetrates the first exhaust valve seat, the first exhaust valve seat is provided with a first exhaust valve plate which is arranged in the first through hole and covers the first through hole, the first exhaust valve seat is provided with a second through hole in the axial direction, the second through hole is coaxially communicated with the double exhaust passage, and the first exhaust valve seat, the upper end surface of the separation middle plate and the first through hole jointly form the lower exhaust branch.

[0012] As an implementation form, a circular flange part is formed on the outer periphery of the upper bearing, and the circular flange part is used for welding and fixing with the compressor shell.

[0013] As an implementation form, the lower pump body assembly comprises a second middle plate, a lower cylinder and a lower bearing connected in sequence along the axial direction, a lower inner cavity is formed in the middle part of the lower cylinder along the axial direction, and the lower cylinder, the second middle plate and the lower bearing jointly form a lower compression chamber.

[0014] As an implementation form, the second middle plate is provided with a third through hole penetrating through the second middle plate along the axial direction and communicating with the third exhaust cutout, the upper end surface of the second middle plate is recessed to form a second exhaust valve seat, the third through hole penetrates through the second exhaust valve seat, and a second exhaust valve plate is arranged in the second exhaust valve seat and covers the third through hole; the second exhaust valve seat is provided with a fourth through hole penetrating through the second exhaust valve seat along the axial direction, and the fourth through hole is coaxially arranged in communication with the double exhaust passage; and the second exhaust valve seat, the lower end surface of the partition middle plate and the third through hole jointly form the upper exhaust branch.

[0015] As an implementation form, the lower bearing is provided with a lower through hole penetrating through the lower bearing along the axial direction and communicating with the fourth exhaust cutout, the lower end surface of the lower bearing is recessed to form a lower exhaust valve seat in communication with the lower sound attenuation chamber, one end of the lower through hole penetrates through the lower exhaust valve seat, and a lower exhaust valve plate is arranged in the lower exhaust valve seat and covers the lower through hole; and the lower through hole and the lower exhaust valve seat jointly form the lower exhaust passage.

[0016] The second aspect of the embodiment of the utility model provides a rotary compressor, comprising the compression pump body structure of any one of the above embodiments. The rotary compressor according to the embodiment of the utility model improves the exhaust capacity through the double exhaust passage penetrating through the whole compression pump body structure, reduces the exhaust resistance under the premise of guaranteeing the volumetric efficiency, and thus improves the performance of the compressor.

[0017] In order to better understand and implement, the utility model is described in detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the compression pump body structure of the embodiment of the utility model.

[0019] Figure 2 It is a top view of the compression pump body structure of the embodiment of the utility model.

[0020] Figure 3 for Figure 2 a cross-sectional view along the direction of A-A shown in the figure;

[0021] Figure 4 a disassembled schematic view of the compression pump body structure of the embodiment of the present application;

[0022] Figure 5 a structural schematic view of the upper pump body assembly of the compression pump body structure of the embodiment of the present application;

[0023] Figure 6 one of disassembled schematic views of the upper pump body assembly of the compression pump body structure of the embodiment of the present application;

[0024] Figure 7 the second of disassembled schematic views of the upper pump body assembly of the compression pump body structure of the embodiment of the present application;

[0025] Figure 8 a structural schematic view of the lower pump body assembly of the compression pump body structure of the embodiment of the present application;

[0026] Figure 9 one of disassembled schematic views of the lower pump body assembly of the compression pump body structure of the embodiment of the present application;

[0027] Figure 10 the second of disassembled schematic views of the lower pump body assembly of the compression pump body structure of the embodiment of the present application;

[0028] Figure 11 a structural schematic view of the upper cylinder and the upper piston of the compression pump body structure of the embodiment of the present application.

[0029] Explanation of reference numerals:

[0030] 10, crankshaft; 11, upper piston; 12, lower piston; 20, upper soundproof cover; 21, upper soundproof chamber; 30, upper bearing; 31, circular flange part; 32, upper through hole; 33, upper exhaust valve seat; 40, upper cylinder; 41, upper inner cavity; 42, first exhaust cutout; 43, second exhaust cutout; 50, first middle plate; 51, first through hole; 52, first exhaust valve seat; 53, second through hole; 60, separation middle plate; 70, second middle plate; 71, third through hole; 72, second exhaust valve seat; 73, fourth through hole; 80, lower cylinder; 81, lower inner cavity; 82, third exhaust cutout; 83, fourth exhaust cutout; 90, lower bearing; 91, lower through hole; 92, lower exhaust valve seat; 100, lower soundproof cover; 101, lower soundproof chamber; 110, double exhaust passage. DETAILED DESCRIPTION

[0031] To further illustrate the embodiments, the utility model provides has the drawing. These drawings are part of the utility model disclosure, which is mainly used to illustrate the embodiments, and can be combined with the related description of the specification to explain the operating principle of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementations and the advantages of the utility model.

[0032] According to the number of cylinders, rotary compressors can be generally divided into single-cylinder compressors and double-cylinder compressors, and the double-cylinder compressor has the advantage of greatly reduced vibration frequency compared with the single-cylinder compressor. The pump body of the double-cylinder compressor is generally composed of an upper sound elimination cover, an upper bearing, an upper cylinder, a middle plate, a lower cylinder, a lower bearing, a lower sound elimination cover, a crankshaft and a piston, and the exhaust mode adopts a single exhaust mode of the upper and lower cylinders. However, since the leakage of the double-cylinder compressor is twice that of the single-cylinder compressor, the exhaust resistance of the double-cylinder compressor is increased, and it is difficult to improve the efficiency, and the energy efficiency of the compressor body is greatly affected, which easily leads to the performance degradation of the compressor.

[0033] Therefore, the utility model embodiment provides a kind of compression pump body structure and rotary compressor, according to the compression pump body structure and rotary compressor of the utility model embodiment, the double exhaust passage 110 of being penetrated through entire compression pump body structure can effectively improve its exhaust capacity, reduce exhaust resistance under the premise of guaranteeing volumetric efficiency, to improve the performance of compressor.

[0034] Please refer to Figures 1 to 10 The utility model embodiment first aspect provides a kind of compression pump body structure, including the upper sound elimination cover 20, upper pump body component, separate middle plate 60, lower pump body component, lower sound elimination cover 100 connected in sequence along the axial direction, upper sound elimination cover 20 and upper pump body component form upper sound elimination room 21 between, upper sound elimination cover 20 is equipped with the upper exhaust outlet that is linked with upper sound elimination room 21, lower sound elimination cover 100 and lower pump body component form lower sound elimination room 101, upper pump body component, separate middle plate 60, lower pump body component are penetrated and equipped with the double exhaust passage 110 that links upper sound elimination room 21 with lower sound elimination room 101 along the axial direction;The upper and lower ends of upper pump body component are equipped with upper exhaust passage, lower exhaust branch respectively, upper exhaust passage is linked with upper sound elimination room 21, lower exhaust branch is linked with double exhaust passage 110;The upper and lower ends of lower pump body component are equipped with upper exhaust branch, lower exhaust passage respectively, upper exhaust branch is linked with double exhaust passage 110, lower exhaust passage is linked with lower sound elimination room 101.

[0035] Wherein, the compression pump body structure of the utility model embodiment further includes crankshaft 10, crankshaft 10 is along the axial direction and is arranged in upper sound elimination cover 20, upper pump body component, separate middle plate 60, lower pump body component, lower sound elimination cover 100, and crankshaft 10 is provided with upper piston 11 and lower piston 12, upper piston 11 is arranged in upper pump body component, and lower piston 12 is arranged in lower pump body component.

[0036] Therefore, according to the compression pump body structure of the embodiment of the utility model, by the double exhaust passages penetrating the upper pump body assembly, the separation middle plate 60 and the lower pump body assembly along the axial direction, and by the upper end of the upper pump body assembly being communicated with the upper sound attenuation chamber 21 through the upper exhaust passage, the lower end of the upper pump body assembly being communicated with the double exhaust passage 110 through the lower exhaust branch, the upper end of the lower pump body assembly being communicated with the double exhaust passage 110 through the upper exhaust branch, and the lower end of the lower pump body assembly being communicated with the lower sound attenuation chamber 101 through the lower exhaust passage, the upper pump body assembly and the lower pump body assembly can both adopt the up-down exhaust mode for exhaust, the exhaust capacity of the entire compression pump body structure is effectively improved, and the exhaust resistance is reduced under the premise of ensuring the volumetric efficiency, so that the performance of the compressor is improved.

[0037] It can be understood that, in the embodiment of the utility model, the upper pump body assembly can realize the up-down exhaust mode for exhaust, the lower pump body assembly can also realize the up-down exhaust mode for exhaust, and the lower exhaust of the upper pump body assembly shares one exhaust passage with the upper exhaust of the lower cylinder, that is, the double exhaust passage 110, so that the gas exhausted from the upper pump body assembly and the lower pump body assembly into the double exhaust passage 110 can enter the upper sound attenuation chamber 21 from the double exhaust passage 110, and then be exhausted to the outside through the upper exhaust outlet of the upper sound attenuation chamber 21, while the gas exhausted downward by the lower pump body assembly enters the lower sound attenuation chamber 101, and then enters the upper sound attenuation chamber 21 through the double exhaust passage 101, and finally is exhausted to the outside through the upper exhaust outlet of the upper sound attenuation chamber 21.

[0038] Optionally, in some embodiments of the utility model, according to the size design of the exhaust capacity variation and the flow area optimization, the ratio between the exhaust capacity V1 of the upper pump body assembly and the exhaust area S1 of the upper pump body assembly is limited to 200mm≤V1 / S1≤500mm, and the ratio between the exhaust capacity V2 of the lower pump body assembly and the exhaust area S2 of the lower pump body assembly is limited to 200mm≤V1 / S1≤500mm, so that the exhaust loss of the upper pump body assembly and the lower pump body assembly can be minimized.

[0039] Optionally, in some embodiments of the utility model, as shown in Figures 5 to 7 The upper pump body assembly comprises an upper bearing 30, an upper cylinder 40 and a first middle plate 50 connected in sequence along the axial direction, an upper inner cavity body 41 is provided in the middle part of the upper cylinder 40 and penetrates along the axial direction, and the upper cylinder 40, the upper bearing 30 and the first middle plate 50 jointly enclose an upper compression chamber; the upper and lower ends of the inner wall of the upper cylinder 40 are respectively and symmetrically provided with a first exhaust incision 42 and a second exhaust incision 43 communicated with the upper inner cavity body 41, the first exhaust incision 42 is communicated with the upper exhaust passage, and the second exhaust incision 43 is communicated with the lower exhaust branch.

[0040] In the above embodiments, the upper bearing 30 is provided with an upper through hole 32 penetrating through the upper bearing 30 along the axial direction and communicating with the first exhaust cutout 42, an upper exhaust valve seat 33 is recessed on the upper end surface of the upper bearing 30 and communicates with the upper silencer chamber 21, the upper through hole 32 penetrates through one end of the upper exhaust valve seat 33, and the upper exhaust valve seat 33 is provided with an upper exhaust valve plate movably covering the upper through hole 32; and the upper through hole 32 and the upper exhaust valve seat 33 jointly form an upper exhaust passage.

[0041] Further, in the above embodiments, the first middle plate 50 is provided with a first through hole 51 penetrating through the first middle plate 50 along the axial direction and communicating with the second exhaust cutout 43, a first exhaust valve seat 52 is recessed on the lower end surface of the first middle plate 50 and penetrates through the first exhaust valve seat 52, and the first exhaust valve seat 52 is provided with a first exhaust valve plate movably covering the first through hole 51; the first exhaust valve seat 52 is provided with a second through hole 53 penetrating through the first exhaust valve seat 52 along the axial direction, and the second through hole 53 is coaxially and communicatively arranged with the double exhaust passage 110; and the first exhaust valve seat 52, the upper end surface of the partition middle plate 60 and the first through hole 51 jointly form a lower exhaust branch passage.

[0042] In addition, in the above embodiments, a circular flange part 31 is formed on the outer circumferential side of the upper bearing 30, and the circular flange part 31 is used for welding and fixing with the compressor shell.

[0043] Optionally, in some embodiments of the utility model, as shown in Figures 8 to 10 Optionally, in some embodiments of the utility model, as shown in

[0044] In the above embodiments, the second middle plate 70 is provided with a third through hole 71 penetrating through the second middle plate 70 along the axial direction and communicating with the third exhaust cutout 82, a second exhaust valve seat 72 is recessed on the upper end surface of the second middle plate 70 and penetrates through the second exhaust valve seat 72, and the second exhaust valve seat 72 is provided with a second exhaust valve plate movably covering the third through hole 71; the second exhaust valve seat 72 is provided with a fourth through hole 73 penetrating through the second exhaust valve seat 72 along the axial direction, and the fourth through hole 73 is coaxially and communicatively arranged with the double exhaust passage 110; and the second exhaust valve seat 72, the lower end surface of the partition middle plate 60 and the third through hole 71 jointly form the upper exhaust branch passage.

[0045] Further, in the above embodiments, the lower bearing 90 is provided with a lower through hole 91 communicating with the fourth exhaust notch 83 in the axial direction, and the lower end surface of the lower bearing 90 is recessed to provide a lower exhaust valve seat 92 communicating with the lower muffling chamber 101, the lower through hole 91 penetrates one end of the lower exhaust valve seat 92, and the lower exhaust valve seat 92 is provided with a movable cover in the lower exhaust valve seat 92 to cover the lower through hole 91; the lower through hole 91 and the lower exhaust valve seat 92 together form a lower exhaust passage.

[0046] It can be understood that, in the above embodiments, the second through hole 53 and the fourth through hole 73 are located in the same axial direction and serve as part of the double exhaust passage 110, so that the upper bearing 30, the upper cylinder 40, the partitioning middle plate 60, the lower cylinder 80, and the lower bearing 90 are provided with through grooves communicating with the second through hole 53 and the fourth through hole 73 in the axial direction of the second through hole 53 and the fourth through hole 73, so as to jointly form the double exhaust passage 110.

[0047] Please refer to Figures 1 to 10 , when the upper pump body assembly exhausts upwards, it enters the upper exhaust valve seat 33 of the upper bearing 30 through the first exhaust notch 42 of the upper cylinder 40 and then directly enters the upper muffling chamber 21, and when the upper pump body assembly exhausts downwards, it enters the first through hole 51 of the first middle plate 50 through the second exhaust notch 43 of the upper cylinder 40, enters the second through hole 53 through the first exhaust valve seat 52 of the first middle plate 50, and then smoothly enters the double exhaust passage 110; similarly, when the lower pump body assembly exhausts upwards, it enters the third through hole 71 of the second middle plate 70 through the third exhaust notch 82 of the lower cylinder 80, enters the fourth through hole 73 through the second exhaust valve seat 72 of the second middle plate 70, and then smoothly enters the double exhaust passage 110, and when the lower pump body assembly exhausts downwards, it enters the lower through hole 91 through the fourth exhaust notch 83 of the lower cylinder 80, and then directly enters the lower muffling chamber 101 through the lower exhaust valve seat 92 of the lower bearing 90, and finally enters the upper muffling chamber 21 through the double exhaust passage 101.

[0048] Optionally, as Figure 11 shown, in some embodiments of the present application, the upper piston 11 is arranged in the upper inner cavity 41 of the upper cylinder 40, and the height difference between the end surface of the upper piston 11 and the end surface of the upper cylinder 40 is L1, which satisfies: L1 < 12um; correspondingly, the lower piston 12 is arranged in the lower inner cavity 81 of the lower cylinder 80, and the height difference between the end surface of the lower piston 12 and the end surface of the lower cylinder 80 is L2, which satisfies: L2 < 12um. It can be understood that, in these embodiments, reducing the height difference between the upper piston 11 and the upper cylinder 40 and between the lower piston 12 and the lower cylinder 80 can reduce the leakage of the compression pump body structure, and thus improve the overall energy efficiency of the compression pump body structure.

[0049] The utility model discloses an embodiment second aspect provides a kind of rotary compressor, including the compression pump body structure of any embodiment above. According to the rotary compressor of the utility model embodiment, the improvement on structure is carried out to compression pump body structure, specifically through the double exhaust passage of the whole compression pump body structure can effectively improve its exhaust capacity, reduce exhaust resistance under the premise of guaranteeing volumetric efficiency, to improve the performance of compressor.

[0050] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does 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 cannot be understood as limiting the utility model.

[0051] The above embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the utility model compression pump body structure and rotary compressor. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the utility model, a number of modifications and improvements can be made, which all belong to the protection scope of the utility model.

Claims

1. A compression pump body structure, characterized in that: comprising an upper silencer cover, an upper pump body assembly, a partitioning middle plate, a lower pump body assembly and a lower silencer cover connected in sequence along the axial direction, an upper silencing chamber is formed between the upper silencer cover and the upper pump body assembly, the upper silencer cover is provided with an upper exhaust outlet communicating with the upper silencing chamber, the lower silencer cover and the lower pump body assembly form a lower silencing chamber, the upper pump body assembly, the partitioning middle plate and the lower pump body assembly are provided with a double exhaust passage communicating the upper silencing chamber and the lower silencing chamber along the axial direction; the upper and lower ends of the upper pump body assembly are respectively provided with an upper exhaust passage and a lower exhaust branch, the upper exhaust passage communicates with the upper silencing chamber, and the lower exhaust branch communicates with the double exhaust passage; the upper and lower ends of the lower pump body assembly are respectively provided with an upper exhaust branch and a lower exhaust passage, the upper exhaust branch communicates with the double exhaust passage, and the lower exhaust passage communicates with the lower silencing chamber.

2. The compression pump body structure according to claim 1, characterized in that: further comprising a crankshaft, the crankshaft is arranged in the upper silencer cover, the upper pump body assembly, the partitioning middle plate, the lower pump body assembly and the lower silencer cover along the axial direction, the crankshaft is provided with an upper piston and a lower piston, the upper piston is arranged in the upper pump body assembly, and the lower piston is arranged in the lower pump body assembly.

3. The compression pump body structure according to claim 1, characterized in that: the upper pump body assembly comprises an upper bearing, an upper cylinder and a first middle plate connected in sequence along the axial direction, the middle part of the upper cylinder is provided with an upper inner cavity along the axial direction, and the upper cylinder, the upper bearing and the first middle plate jointly form an upper compression chamber; the upper and lower ends of the inner wall of the upper cylinder are respectively and symmetrically provided with a first exhaust cutout and a second exhaust cutout communicating with the upper inner cavity, the first exhaust cutout communicates with the upper exhaust passage, and the second exhaust cutout communicates with the lower exhaust branch.

4. The compression pump body structure according to claim 3, characterized in that: the upper bearing is provided with an upper through hole communicating with the first exhaust cutout along the axial direction, the upper end surface of the upper bearing is recessed to form an upper exhaust valve seat communicating with the upper silencing chamber, one end of the upper through hole penetrates the upper exhaust valve seat, and the upper exhaust valve seat is provided with an upper exhaust valve plate movably arranged in the upper through hole; the upper through hole and the upper exhaust valve seat jointly form the upper exhaust passage.

5. The compression pump body structure according to claim 3, characterized in that: the first middle plate is provided with a first through hole communicating with the second exhaust cutout along the axial direction, the lower end surface of the first middle plate is recessed to form a first exhaust valve seat, the first through hole penetrates the first exhaust valve seat, and the first exhaust valve seat is provided with a first exhaust valve plate movably arranged in the first through hole; the first exhaust valve seat is provided with a second through hole along the axial direction, the second through hole is coaxially arranged in communication with the double exhaust passage; the first exhaust valve seat, the upper end surface of the partitioning middle plate and the first through hole jointly form the lower exhaust branch.

6. The compression pump body structure according to claim 3, characterized in that: ​ ​ ​ ​ ​ The outer periphery of the upper bearing is formed with a circular flange portion for welding and fixing with the compressor housing.

7. The compression pump body structure according to claim 1, characterized in that: The lower pump body assembly comprises a second middle plate, a lower cylinder and a lower bearing connected in sequence along the axial direction, the middle part of the lower cylinder is provided with a lower inner cavity body penetratingly formed along the axial direction, the lower cylinder, the second middle plate and the lower bearing jointly form a lower compression chamber, the upper and lower ends of the inner wall of the lower cylinder are respectively and symmetrically provided with a third exhaust cutout and a fourth exhaust cutout in communication with the lower inner cavity body, the third exhaust cutout is in communication with the upper exhaust branch, and the fourth exhaust cutout is in communication with the lower exhaust passage.

8. The compression pump body structure according to claim 7, characterized in that: The second middle plate is provided with a third through hole penetratingly formed along the axial direction and in communication with the third exhaust cutout, the upper end surface of the second middle plate is recessed to form a second exhaust valve seat, the third through hole penetrates through the second exhaust valve seat, the second exhaust valve seat is provided with a second exhaust valve plate movably arranged in the third through hole, the second exhaust valve seat is provided with a fourth through hole penetratingly formed along the axial direction, the fourth through hole is coaxially arranged in communication with the double exhaust passage, and the second exhaust valve seat, the lower end surface of the partition middle plate and the third through hole jointly form the upper exhaust branch.

9. The compression pump body structure according to claim 7, characterized in that: The lower bearing is provided with a lower through hole penetratingly formed along the axial direction and in communication with the fourth exhaust cutout, the lower end surface of the lower bearing is recessed to form a lower exhaust valve seat in communication with the lower sound attenuation chamber, one end of the lower through hole penetrates through the lower exhaust valve seat, the lower exhaust valve seat is provided with a lower exhaust valve plate movably arranged in the lower through hole, and the lower through hole and the lower exhaust valve seat jointly form the lower exhaust passage.

10. A rotary compressor, characterized in that: The rotary compressor comprises the compression pump body structure according to any one of claims 1 to 9.

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