Two-stage rolling rotor pump body

Abstract

The utility model discloses a two-stage rolling rotor pump body which comprises a shell and a pump main body arranged in the shell, a first air cylinder hole and a second air cylinder hole are formed in the pump main body, a connecting groove is formed in the bottom of the shell, an annular connecting part is arranged in the middle of the connecting groove, and a first mounting part used for being connected with the connecting groove in a clamped mode is arranged on the pump main body. The pump body is provided with a second mounting part used for being connected with the annular connecting part in a clamped mode, a high-pressure cavity is formed among the connecting groove, the annular connecting part and the pump body, the pump body is provided with a second exhaust hole used for communicating the high-pressure cavity with the second air cylinder hole, and the pump body is provided with a second exhaust valve corresponding to the second exhaust hole in position. A sliding vane cavity is formed in the pump body, a vent hole used for balancing air pressure at the two ends of the second sliding vane is formed between the high-pressure cavity and the sliding vane cavity, and a third exhaust hole used for connecting the high-pressure cavity and the exterior of the shell is formed in the shell. The device has the advantages of being high in working efficiency, stable in working and simple in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of rolling rotor compressors, and particularly relates to a two-stage rolling rotor pump body. Background Art

[0002] Rotary compressors are divided into two categories, one is the fixed vane type, and the other is the sliding vane type. In the fixed vane rotary compressor, the rotor is installed on the eccentric shaft. When rotating, it generates a volume change and relies on the fixed vanes to separate the cylinder. This type of compressor must be provided with a check valve on the exhaust or suction pipeline to prevent the refrigerant from flowing back from the condenser to the evaporator when the machine stops. The sliding vane rotary compressor is very similar to a vane pump. Without a sealing ring, relying on centrifugal force, lubricating oil, and the eccentricity of the rotor to the cylinder, the tight fit between the vane and the cylinder is achieved. Whether it is good or not has a great relationship with the supply of lubricating oil.

[0003] ‌The rolling rotor compressor consists of a pump body and a motor, specifically including a rolling rotor, a cylinder, a sliding vane, a cylinder end cover, an eccentric shaft, a motor, and a compressor assembly.‌ The rolling rotor‌ and‌ the cylinder‌ are the core components of the rolling rotor compressor. The rolling rotor is installed on the rotating shaft, and the cylinder provides the compression space.‌ The sliding vane‌ is installed in the cylinder and works together with the rolling rotor to assist the compression process.‌ The cylinder end cover‌ is used to seal the cylinder to ensure the tightness of the compression process.‌ The eccentric shaft‌ is connected to the rolling rotor. Through the rotation of the eccentric shaft, the rolling rotor slides in the cylinder to achieve gas compression.‌ The motor assembly‌ includes a stator and a rotor, providing power for the entire compressor.‌ The compressor assembly‌ includes a crankshaft, an upper bearing, a lower bearing, and an exhaust valve plate. These components work together to ensure the normal operation of the compressor.

[0004] Generally, a two-stage rolling rotor compressor consists of two cylinders. The exhaust gas compressed by the first cylinder is supplied to the suction of the second cylinder, and its exhaust is intermittent. Therefore, in the two-stage rolling rotor compressor, the intermittent exhaust of the first cylinder corresponds to the continuous suction of the second cylinder. The suction of the second cylinder is unsaturated, and the suction efficiency is low, affecting the overall performance of the compressor.

[0005] When the existing rolling rotor compressor works, it directly sucks the gas into the cylinder for compression and then discharges it into the compressor housing. Due to the low gas density at the intake end and low suction efficiency, the overall working efficiency of the compressor is low; the suction efficiency of the second cylinder of the two-cylinder rolling rotor compressor is low, affecting the performance of the compressor; when the sliding vane installation groove is a sealed structure, the pressure difference at both ends of the sliding vane is large, affecting the sliding of the sliding vane, the cooperation between the sliding vane and the rolling rotor, and the working stability of the compressor. Summary of the Invention

[0006] The purpose of the utility model is to provide a two-stage rolling rotor pump body aiming at the problems existing in the prior art, which has the advantages of high working efficiency, stable operation, and simple structure.

[0007] To achieve the above object, the technical solution adopted by the present utility model is as follows: A two-stage rolling rotor pump body, comprising a housing and a pump main body disposed within the housing. The pump main body is provided with a first cylinder hole and a second cylinder hole. Rolling rotors are respectively disposed within the first cylinder hole and the second cylinder hole. The pump main body includes a crankshaft for driving the rolling rotors. The inner bottom of the housing is provided with a connection groove, and a circular connection portion is disposed in the middle of the connection groove. The pump main body is provided with a first mounting portion for engaging and connecting with the connection groove, and a second mounting portion for engaging and connecting with the circular connection portion. A high-pressure cavity is formed among the connection groove, the circular connection portion, and the pump main body. The pump main body is provided with a second exhaust hole for communicating the high-pressure cavity and the second cylinder hole. The pump main body is provided with a second exhaust valve corresponding to the position of the second exhaust hole. The pump main body is provided with a sliding vane cavity for connecting a second sliding vane. A vent hole for balancing the air pressure at both ends of the second sliding vane is provided between the high-pressure cavity and the sliding vane cavity. The housing is provided with a third exhaust hole for connecting the high-pressure cavity and the outside of the housing.

[0008] In the above solution, the housing is used to connect and limit the pump main body. The housing is used to connect the cover body to form a compressor housing structure. The pump main body is provided with two cylinder holes, which cooperate with the crankshaft and the rolling rotors to achieve two-stage gas compression. The high-pressure cavity is formed by the cooperation of the connection groove in the housing and the first mounting portion, and the cooperation of the circular connection portion and the second mounting portion. The second exhaust hole is provided to discharge the compressed gas in the second cylinder hole to the high-pressure cavity. Finally, the gas in the high-pressure cavity is discharged from the compressor closed housing structure through the third exhaust hole. A closed sliding vane cavity is provided on the second cylinder member. A spring is disposed within the sliding vane cavity to drive the second sliding vane to slide within the sliding vane cavity, realizing the cooperation with the rolling rotor. The sliding vane cavity is connected to the high-pressure cavity through a vent hole to introduce the gas in the high-pressure cavity into the sliding vane cavity, facilitating the balancing of the air pressure at both ends of the second sliding vane. The vent hole connects the high-pressure gas to the rear end of the slider, playing a boosting role when the rolling rotor inhales, and playing a role in pressure balance and boosting for the reciprocating motion of the slider, ensuring the stable contact between the sliding vane and the rolling rotor.

[0009] Further, the pump main body includes a first cylinder head, a first cylinder member, a middle partition plate, a second cylinder member, and a second cylinder head sequentially connected by a first fastener. The second cylinder head includes a first mounting portion and a second mounting portion. The first cylinder head is connected to the housing by a second fastener.

[0010] Connecting the first cylinder head, the first cylinder member, the middle partition plate, the second cylinder member, and the second cylinder head by a first fastener ensures the connection stability. After the pump main body is engaged and connected with the connection groove and the circular connection portion of the housing, the housing and the pump main body are locked by a second fastener, which is convenient for installation and maintenance.

[0011] Further, an air inlet is provided on the side of the housing. An intake pipe is arranged between the first cylinder hole and the air inlet. A first cylinder hole is provided in the middle of the first cylinder part, and a second cylinder hole is provided in the middle of the second cylinder part. A rolling rotor is arranged in the cylinder hole, and the rolling rotors are all rotatably connected to the eccentric shaft of the crankshaft.

[0012] External gas is introduced into the first cylinder hole through the intake pipe for primary compression. The first cylinder hole and the second cylinder hole are correspondingly provided in the middle of the first cylinder part and the second cylinder part, and cooperate with the first cylinder head, the middle partition plate, and the second cylinder head to form two cylinder holes. In cooperation with the crankshaft and the rolling rotor, other compression is realized, and the structure is simple.

[0013] Further, a first sealing ring is arranged between the first mounting part and the connecting groove, and a second sealing ring is arranged between the second mounting part and the annular connecting part.

[0014] By providing the first sealing ring and the second sealing ring, the connection airtightness between the first mounting part and the connecting groove and between the second mounting part and the annular connecting part is ensured, and gas leakage is avoided.

[0015] Further, a first sliding vane groove is provided on the first cylinder part. A first sliding vane and a spring for resetting the first sliding vane are slidably arranged in the first sliding vane groove, and the first sliding vane groove communicates with the inside of the compressor housing.

[0016] The first sliding vane and the spring are connected through the first sliding vane groove. The first sliding vane is kept in contact with the rolling rotor through the spring, so as to realize the gas compression function. The first sliding vane groove communicates with the inside of the compressor housing to ensure the pressure balance on both sides of the first sliding vane and facilitate the sliding of the first sliding vane.

[0017] Further, a cylinder inlet communicating with the inside of the compressor housing is provided on the second cylinder part. The sliding vane cavity includes a second sliding vane groove, and a sealing spring pin is arranged at the end of the second sliding vane groove.

[0018] The medium-pressure gas in the compressor housing is inhaled into the second cylinder hole through the cylinder inlet for secondary compression. The spring and the second sliding vane are connected through the second sliding vane groove. The outer end of the second sliding vane groove is closed by the sealing spring pin, cutting off the connection between the high-pressure cavity and the inside of the compressor housing to avoid gas leakage.

[0019] Further, a first exhaust hole for communicating with the first cylinder hole is provided on the first cylinder head. A first exhaust valve corresponding to the position of the first exhaust hole is arranged on the first cylinder head, and an exhaust silencing cover is arranged on the first cylinder head.

[0020] The first exhaust hole on the first cylinder head is used to discharge the medium-pressure gas that has been primarily compressed in the first cylinder hole into the inside of the compressor housing. The first exhaust valve is used to prevent gas from flowing back, and the exhaust silencing cover is used to reduce exhaust noise.

[0021] Further, a number of mounting platforms are provided at the inner hole of the housing, screw holes are opened on the mounting platforms, and connection holes corresponding to the screw holes are opened on the first cylinder head.

[0022] The fastening between the housing and the pump body is realized by connecting screws corresponding to the connection holes and the screw holes.

[0023] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0024] 1. By providing two cylinder holes on the pump body and cooperating with the crankshaft and the rolling rotor to realize two-stage gas compression. First, the gas is compressed to medium-pressure gas at the first cylinder hole and discharged into the compressor housing space. Then, the medium-pressure gas is further compressed to high-pressure gas through the second cylinder hole, and the high-pressure gas is discharged from the compressor housing through the high-pressure cavity. The compressor housing space is used to store the medium-pressure gas, which greatly improves the suction efficiency during the second-stage compression, thereby improving the overall compression efficiency of the compressor.

[0025] 2. Since the pressure of the second cylinder hole on the second sliding vane is relatively large during the second-stage compression, it is easy to affect the contact tightness between the second sliding vane and the rolling rotor. A vent hole is provided between the sealed sliding vane cavity and the high-pressure cavity to ensure the pressure balance on both sides of the second sliding vane, reduce the sliding resistance of the sliding vane, and connect the high-pressure gas to the rear end of the slider. When the rotor inhales gas, it plays a boosting role in the reciprocating motion of the slider, ensuring the close contact between the second sliding vane and the rolling rotor, ensuring the working stability of the compressor, avoiding the phenomenon of large power consumption or direct stoppage of the reciprocating motion of the sliding vane, and improving the working efficiency of the compressor.

[0026] 3. By splitting the pump body structure into the first cylinder head, the first cylinder part, the middle partition plate, the second cylinder part, and the second cylinder head, it is convenient to form two-stage cylinder holes, with a simple structure and easy manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an exploded view of the structure of a two-stage rolling rotor pump body according to Embodiment 1 of the present utility model;

[0028] Figure 2 It is a top view of the structure of a two-stage rolling rotor pump body according to Embodiment 1 of the present utility model;

[0029] Figure 3 It is Figure 2 sectional view A-A in

[0030] Figure 4 It is Figure 2 sectional view B-B in

[0031] In the figure: 1. Outer shell; 2. First cylinder hole; 3. Second cylinder hole; 4. Rolling rotor; 5. Crankshaft; 6. Connecting groove; 7. Annular connecting part; 8. First mounting part; 9. Second mounting part; 10. High-pressure cavity; 11. First exhaust hole; 12. Second exhaust hole; 13. First exhaust valve; 14. Second exhaust valve; 15. First sliding vane; 16. Second sliding vane; 17. Vent hole; 18. Third exhaust hole; 19. First fastening hole; 20. Connecting hole; 21. First cylinder head; 22. First cylinder part; 23. Middle partition plate; 24. Second cylinder part; 25. Second cylinder head; 26. Air inlet; 27. Air inlet pipe; 28. Screw hole; 29. First sealing ring; 30. Second sealing ring; 31. First sliding vane groove; 32. Second sliding vane groove; 33. Spring; 34. Cylinder inlet; 35. Sealing spring pin; 36. Exhaust silencing cover; 37. Mounting table. Specific embodiments

[0032] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms front, back, left, right, etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention or simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. Embodiment 1

[0033] As Figures 1-4As shown in the figure, a two-stage rolling rotor 4 pump body includes a housing 1 and a pump main body disposed within the housing 1. The pump main body is provided with a first cylinder bore 2 and a second cylinder bore 3. Rolling rotors 4 are respectively disposed within the first cylinder bore 2 and the second cylinder bore 3. The pump main body includes a crankshaft 5 for driving the rolling rotors 4. A connecting groove 6 is provided at the inner bottom of the housing 1. An annular connecting portion 7 is provided in the middle of the connecting groove 6. The pump main body is provided with a first mounting portion 8 for snap-connecting with the connecting groove 6, and a second mounting portion 9 for snap-connecting with the annular connecting portion 7. A high-pressure cavity 10 is formed among the connecting groove 6, the annular connecting portion 7, and the pump main body. The pump main body is provided with a second exhaust hole 12 for communicating the high-pressure cavity 10 and the second cylinder bore 3. The pump main body is provided with a second exhaust valve 14 corresponding to the position of the second exhaust hole 12. The pump main body is provided with a sliding vane cavity for connecting a second sliding vane 16. A vent hole 17 is provided between the high-pressure cavity 10 and the sliding vane cavity for balancing the air pressure at both ends of the second sliding vane 16. The housing 1 is provided with a third exhaust hole 18 for connecting the high-pressure cavity 10 and the outside of the housing 1.

[0034] In the above solution, the pump main body is connected and limited by the housing 1. The housing 1 is used to connect the cover body to form a compressor housing structure. The pump main body is provided with two cylinder bores, which cooperate with the crankshaft 5 and the rolling rotors 4 to achieve two-stage gas compression. The high-pressure cavity 10 is formed by the cooperation of the connecting groove 6 in the housing 1 and the first mounting portion 8, and the cooperation of the annular connecting portion 7 and the second mounting portion 9. The second exhaust hole 12 is provided to discharge the compressed gas in the second cylinder bore 3 to the high-pressure cavity 10. Finally, the gas in the high-pressure cavity 10 is discharged from the compressor closed housing structure through the third exhaust hole 18. A closed sliding vane cavity is provided on the second cylinder member 24. A spring 33 is disposed within the sliding vane cavity to drive the second sliding vane 16 to slide within the sliding vane cavity, realizing the cooperation with the rolling rotor 4. The sliding vane cavity is connected to the high-pressure cavity 10 through the vent hole 17 to introduce the gas in the high-pressure cavity 10 into the sliding vane cavity, facilitating the balancing of the air pressure at both ends of the second sliding vane 16. The vent hole 17 connects the high-pressure gas to the rear end of the slider, playing a boosting role when the rolling rotor 4 inhales, and playing a role in pressure balance and boosting for the reciprocating movement of the slider, ensuring the stable contact between the sliding vane and the rolling rotor 4.

[0035] A circular connecting groove 6 and an annular connecting portion 7 are provided at the bottom of the inner bore of the housing 1. The connecting groove 6 and the annular connecting portion 7 are concentrically arranged.

[0036] Further, the pump main body includes a first cylinder head 21, a first cylinder member 22, a middle partition 23, a second cylinder member 24, and a second cylinder head 25 sequentially connected by a first fastener. The second cylinder head 25 includes a first mounting portion 8 and a second mounting portion 9. The first cylinder head 21 is connected to the housing 1 by a second fastener.

[0037] The cylinder head 1 - 21, the cylinder part 1 - 22, the middle partition 23, the cylinder part 2 - 24, and the cylinder head 2 - 25 are connected by a fastener 1 to ensure the connection stability. After the connection groove 6 and the annular connection part 7 of the pump main body and the housing 1 are engaged and connected, the housing 1 and the pump main body are locked by a fastener 2, which is convenient for installation and maintenance.

[0038] Threaded holes are provided on the cylinder head 1 - 21, and fastening holes 1 - 19 are correspondingly provided on the cylinder part 1 - 22, the middle partition 23, the cylinder part 2 - 24, and the cylinder head 2 - 25 to cooperate with the threaded holes to connect the fastener 1.

[0039] Furthermore, an air inlet 26 is provided on the side of the housing 1. An intake pipe 27 is provided between the cylinder hole 1 - 2 and the air inlet 26. A cylinder hole 1 - 2 is provided in the middle of the cylinder part 1 - 22, and a cylinder hole 2 - 3 is provided in the middle of the cylinder part 2 - 24. A rolling rotor 4 is provided in the cylinder hole. The rolling rotor 4 is rotatably connected to the eccentric shaft of the crankshaft 5.

[0040] External gas is introduced into the cylinder hole 1 - 2 through the intake pipe 27 for primary compression. Cylinder holes 1 - 2 and 2 - 3 are correspondingly provided in the middle of the cylinder part 1 - 22 and the cylinder part 2 - 24, which cooperate with the cylinder head 1 - 21, the middle partition 23, and the cylinder head 2 - 25 to form two cylinder holes, and cooperate with the crankshaft 5 and the rolling rotor 4 to achieve other compression. The structure is simple.

[0041] Furthermore, a sealing ring 1 - 29 is provided between the mounting part 1 - 8 and the connection groove 6, and a sealing ring 2 - 30 is provided between the mounting part 2 - 9 and the annular connection part 7.

[0042] By providing the sealing ring 1 - 29 and the sealing ring 2 - 30, the connection airtightness between the mounting part 1 - 8 and the connection groove 6, and between the mounting part 2 - 9 and the annular connection part 7 is ensured, and gas leakage is avoided.

[0043] The cylinder head 2 - 25 is of a cylindrical structure. The mounting part 1 - 8 is located at the bottom of the cylindrical structure. The mounting part 2 - 9 includes an annular convex structure provided at the center of the bottom of the cylindrical structure. A crankshaft hole is provided in the middle of the annular convex structure to rotatably connect with the crankshaft 5.

[0044] The inner hole of the annular connection part 7 is engaged and connected with the outer circle of the mounting part 2 - 9. An oil hole for the oil to flow through the end of the crankshaft 5 is provided between the inner hole of the annular connection part 7 and the inside of the compressor housing.

[0045] Furthermore, a sliding vane groove 1 - 31 is provided on the cylinder part 1 - 22. A sliding vane 1 - 15 and a spring 33 for resetting the sliding vane 1 - 15 are slidably arranged in the sliding vane groove 1 - 31. The sliding vane groove 1 - 31 communicates with the inside of the compressor housing.

[0046] The sliding vane 15 is connected to the spring 33 through the first sliding vane groove 31. The spring 33 keeps the sliding vane 15 in contact with the rolling rotor 4, thereby realizing the gas compression function. The first sliding vane groove 31 communicates with the inside of the compressor housing to ensure the pressure balance on both sides of the sliding vane 15 and facilitate the sliding of the sliding vane 15.

[0047] Furthermore, an air cylinder inlet 34 communicating with the inside of the compressor housing is provided on the second air cylinder part 24. The sliding vane cavity includes a second sliding vane groove 32, and a sealing spring pin 35 is provided at the end of the second sliding vane groove 32.

[0048] The medium-pressure gas in the compressor housing is sucked into the second air cylinder hole 3 through the air cylinder inlet 34 for secondary compression. The spring 33 and the second sliding vane 16 are connected through the second sliding vane groove 32. The outer end of the second sliding vane groove 32 is closed by the sealing spring pin 35 to cut off the connection between the high-pressure cavity 10 and the inside of the compressor housing and prevent gas leakage.

[0049] The sealing spring pin 35 can be connected by means of threaded connection or interference fit. Both the first sliding vane groove 31 and the second sliding vane groove 32 include a spring 33 groove and a sliding straight groove. The spring 33 groove is used to arrange the spring 33, and the sliding straight groove is used for the sliding of the sliding vane. Raised parts are provided on the second cylinder head 25 and the middle partition 23 to close the upper and lower sides of the second sliding vane groove 32.

[0050] Furthermore, an exhaust hole 11 for communicating with the first air cylinder hole 2 is provided on the first cylinder head 21. An exhaust valve 13 corresponding to the position of the exhaust hole 11 is provided on the first cylinder head 21, and an exhaust silencing cover 36 is provided on the first cylinder head 21.

[0051] The exhaust hole 11 on the first cylinder head 21 is used to discharge the medium-pressure gas that has been compressed in the first air cylinder hole 2 into the compressor housing. The exhaust valve 13 is used to prevent gas backflow, and the exhaust silencing cover 36 is used to reduce exhaust noise.

[0052] Both the exhaust valve 13 and the exhaust valve 14 include an exhaust valve plate and a limiting plate for restricting the opening degree of the exhaust valve plate. The compressor housing refers to the outer shell 1 and the cover body.

[0053] Furthermore, a number of mounting platforms 37 are provided at the inner hole of the outer shell 1. Screw holes 28 are provided on the mounting platforms 37, and connection holes 20 corresponding to the screw holes 28 are provided on the first cylinder head 21.

[0054] The outer shell 1 and the pump main body are fastened by connecting screws corresponding to the connection holes 20 and the screw holes 28.

[0055] Fastener 1 and Fastener 2 include screws. The crankshaft 5 is rotatably connected to the middle parts of cylinder head 1, cylinder part 1, middle partition plate 23, cylinder part 2, and cylinder head 2.

[0056] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A two-stage rolling rotor pump body, comprising a housing and a pump body disposed in the housing, wherein the pump body is provided with a cylinder hole 1 and a cylinder hole 2, wherein the cylinder hole 1 and the cylinder hole 2 are respectively provided with rolling rotors, and the pump body comprises a crankshaft for driving the rolling rotor, characterized in that: A connecting groove is provided at the inner bottom of the shell, an annular connecting portion is provided in the middle of the connecting groove, a mounting portion 1 for engaging with the connecting groove is provided on the pump body, a mounting portion 2 for engaging with the annular connecting portion is provided on the pump body, a high-pressure cavity is formed between the connecting groove, the annular connecting portion and the pump body, an exhaust hole 2 for connecting the high-pressure cavity and cylinder hole 2 is provided on the pump body, an exhaust valve 2 corresponding to the position of the exhaust hole 2 is provided on the pump body, a vane cavity for connecting vane 2 is provided on the pump body, an air vent for balancing the air pressure at both ends of vane 2 is provided between the high-pressure cavity and the vane cavity, and an exhaust hole 3 for connecting the high-pressure cavity and the outside of the shell is provided on the shell.

2. The double-stage rolling rotor pump body according to claim 1, characterized in that: The pump body comprises a cylinder head 1, a cylinder part 1, a middle partition, a cylinder part 2 and a cylinder head 2 which are sequentially connected by a fastener 1. The cylinder head 2 comprises a mounting part 1 and a mounting part 2. The cylinder head 1 is connected to the outer shell by a fastener 2.

3. The double-stage rolling rotor pump body according to claim 2, characterized in that: An air inlet is provided on the side of the shell, an air inlet pipe is provided between the cylinder hole 1 and the air inlet, a cylinder hole 1 is provided in the middle of the cylinder part 1, a cylinder hole 2 is provided in the middle of the cylinder part 2, rolling rotors are provided in the cylinder holes, and the rolling rotors are rotatably connected to the eccentric shaft of the crankshaft.

4. The double-stage rolling rotor pump body according to claim 1, characterized in that: A sealing ring 1 is arranged between the first mounting portion and the connecting groove, and a sealing ring 2 is arranged between the second mounting portion and the annular connecting portion.

5. The double-stage rolling rotor pump body according to claim 2, characterized in that: A sliding vane groove 1 is provided on the cylinder member 1, a sliding vane 1 and a spring for returning the sliding vane 1 are slidably arranged in the sliding vane groove 1, and the sliding vane groove 1 is communicated with the interior of the compressor housing.

6. The double-stage rolling rotor pump body according to claim 2, characterized in that: The second cylinder component is provided with a cylinder inlet which is communicated with the interior of the compressor housing. The vane cavity comprises a second vane groove. A sealing spring pin is provided at the end of the second vane groove.

7. The double-stage rolling rotor pump body according to claim 3, characterized in that: An exhaust hole 1 for communicating with a cylinder hole 1 is provided on the cylinder head 1, an exhaust valve 1 corresponding to the position of the exhaust hole 1 is provided on the cylinder head 1, and an exhaust silencer cover is provided on the cylinder head 1.

8. The double-stage rolling rotor pump body according to claim 2, characterized in that: A plurality of mounting platforms are arranged at the inner hole of the shell, screw holes are opened on the mounting platforms, and connecting holes corresponding to the screw holes are opened on the cylinder cover.

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