Two-stage rolling rotor pump body

Abstract

The invention discloses a two-stage rolling rotor pump body which comprises a shell and a pump body arranged in the shell, a first air cylinder hole and a second air cylinder hole are formed in the pump 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 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 invention belongs to the technical field of rolling rotor compressors, and in particular relates to a two-stage rolling rotor pump body. Background Art

[0002] There are two types of rotary compressors, one is the stator type and the other is the vane type. The rotor of the stator type rotary compressor is mounted on an eccentric shaft. When rotating, the volume changes and the cylinder is separated by the stator. This type of compressor must be equipped with a one-way valve on the exhaust or suction pipeline to prevent the refrigerant from flowing back from the condenser to the evaporator when shut down. The vane type rotary compressor is very similar to a vane pump. There is no sealing ring, and the centrifugal force and lubricating oil, as well as the eccentricity of the rotor to the cylinder, are used to achieve the close fit between the blade and the cylinder. Whether it is good or not is closely related to the supply of lubricating oil.

[0003] The composition of the rolling rotor compressor includes a pump body and a motor, specifically a rolling rotor, a cylinder, a 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, in which the rolling rotor is mounted on the rotating shaft, and the cylinder provides a space for compression. The vane is installed in the cylinder and works with the rolling rotor to assist in the compression process. The cylinder end cover is used to seal the cylinder to ensure the sealing 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, which provide 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, and the exhaust after compression of the first cylinder supplies the air intake of the second cylinder, and the exhaust is intermittent. Therefore, the two-stage rolling rotor compressor forms an intermittent exhaust of the first cylinder corresponding to the continuous intake of the second cylinder. The intake of the second cylinder is unsaturated, and the intake efficiency is low, which affects the overall performance of the compressor.

[0005] When the existing rolling rotor compressor is working, the gas is directly sucked into the cylinder, compressed, and then discharged into the compressor casing. Since the gas density at the intake end is small and the suction efficiency is low, the overall working efficiency of the compressor is low; the suction efficiency of the second cylinder of the double-cylinder rolling rotor compressor is low, which affects the performance of the compressor; when the vane mounting groove is a sealing structure, the pressure difference at both ends of the vane is large, which affects the sliding of the vane, the coordination between the vane and the rolling rotor, and the working stability of the compressor. Summary of the invention

[0006] The purpose of the present invention is to provide a two-stage rolling rotor pump body with the advantages of high working efficiency, stable operation and simple structure in view of the problems existing in the prior art.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a two-stage rolling rotor pump body, including a shell and a pump body arranged in the shell, the pump body is provided with a cylinder hole 1 and a cylinder hole 2, and the cylinder hole 1 and the cylinder hole 2 are respectively provided with rolling rotors, the pump body includes a crankshaft for driving the rolling rotor, the inner bottom of the shell is provided with a connecting groove, the middle of the connecting groove is provided with an annular connecting portion, the pump body is provided with a mounting portion 1 for engaging with the connecting groove, the pump body is provided with a mounting portion 2 for engaging with the annular connecting portion, a high-pressure cavity is formed between the connecting groove, the annular connecting portion, and the pump body, the pump body is provided with an exhaust hole 2 for connecting the high-pressure cavity and the cylinder hole 2, the pump body is provided with an exhaust valve 2 corresponding to the position of the exhaust hole 2, the pump body is provided with a vane cavity for connecting the vane 2, a vent hole for balancing the air pressure at both ends of the vane 2 is provided between the high-pressure cavity and the vane cavity, and the shell is provided with an exhaust hole 3 for connecting the high-pressure cavity and the outside of the shell.

[0008] In the above scheme, the pump body is connected and limited by the shell, and the shell is used to connect the cover body to form a compressor shell structure. Two cylinder holes are provided on the pump body, which cooperate with the crankshaft and the rolling rotor to realize two-stage gas compression. The high-pressure cavity is formed by cooperating the connecting groove in the shell with the mounting part one, and the annular connecting part with the mounting part two. The exhaust hole two is provided to discharge the compressed gas in the cylinder hole two to the high-pressure cavity, and finally the gas in the high-pressure cavity is discharged from the compressor closed shell structure through the exhaust hole three. A closed vane cavity is provided on the cylinder part two, and a spring is provided in the vane cavity to drive the vane two to slide in the vane cavity to achieve cooperation with the rolling rotor. The vane cavity and the high-pressure cavity are connected through the vent hole to introduce the gas in the high-pressure cavity into the vane cavity, which is convenient for balancing the air pressure at both ends of the vane two. The vent hole connects the high-pressure gas to the rear end of the slider, which plays a boosting role when the rolling rotor inhales air, and plays a pressure balancing and boosting role for the reciprocating motion of the slider, thereby ensuring stable contact between the vane and the rolling rotor.

[0009] Furthermore, the pump body includes 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 includes a mounting part 1 and a mounting part 2; and the cylinder head 1 is connected to the outer casing by a fastener 2.

[0010] Cylinder head one, cylinder part one, middle partition, cylinder part two and cylinder head two are connected by fastener one to ensure connection stability. After the connecting groove and annular connecting part of the pump body and the shell are engaged and connected, the shell and the pump body are locked by fastener two, which is convenient for installation and maintenance.

[0011] Furthermore, an air inlet is provided on the side of the shell, an air intake 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, and rolling rotors are provided in the cylinder holes, and the rolling rotors are rotatably connected to the eccentric shaft of the crankshaft.

[0012] External gas is introduced into cylinder hole one through an intake pipe for primary compression. Cylinder hole one and cylinder hole two are correspondingly opened in the middle of cylinder part one and cylinder part two, and cylinder head one, middle partition plate and cylinder head two are coordinated to form two cylinder holes in a chain. Other compression is achieved by cooperating with a crankshaft and a rolling rotor, and the structure is simple.

[0013] Furthermore, a sealing ring 1 is arranged between the mounting portion 1 and the connecting groove, and a sealing ring 2 is arranged between the mounting portion 2 and the annular connecting portion.

[0014] The sealing ring 1 and the sealing ring 2 are provided to ensure the air tightness of the connection between the mounting part 1 and the connecting groove, and between the mounting part 2 and the annular connecting part, thereby avoiding gas leakage.

[0015] Furthermore, 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 connected to the interior of the compressor housing.

[0016] Sliding vane 1 and spring are connected through sliding vane groove 1, and sliding vane 1 is kept in contact with the rolling rotor through the spring, thereby realizing the gas compression function. Sliding vane groove 1 is connected with the inside of the compressor housing to ensure the pressure balance on both sides of sliding vane 1, which is convenient for sliding of sliding vane 1.

[0017] Furthermore, the second cylinder component is provided with a cylinder inlet which is connected with the interior of the compressor housing, the vane cavity comprises a second vane groove, and a sealing spring pin is provided at the end of the second vane groove.

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

[0019] Furthermore, the cylinder head is provided with an exhaust hole 1 for communicating with the cylinder hole 1, the cylinder head is provided with an exhaust valve 1 corresponding to the position of the exhaust hole 1, and the cylinder head is provided with an exhaust silencer cover.

[0020] The exhaust hole 1 on the cylinder head 1 is used to discharge the medium-pressure gas that has been compressed in the cylinder hole 1 to the interior of the compressor housing. The exhaust valve 1 is used to prevent gas backflow. The exhaust silencer cover is used to reduce exhaust noise.

[0021] Furthermore, 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.

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

[0023] Compared with the prior art, the present invention has the following beneficial effects: 1. Two cylinder holes are set on the pump body, and two-stage gas compression is realized in conjunction with the crankshaft and rolling rotor. The gas is first compressed into medium-pressure gas in the first stage of the cylinder hole and discharged into the compressor shell space. Then, the medium-pressure gas is compressed into high-pressure gas through the second and second stages of the cylinder hole. The high-pressure gas is discharged from the compressor shell through the high-pressure cavity. The compressor shell space is used to store the medium-pressure gas, which greatly improves the suction efficiency during the two-stage compression, thereby improving the overall compression efficiency of the compressor; 2. During the secondary compression, the pressure of the cylinder hole 2 on the vane 2 is relatively large, which easily affects the contact tightness between the vane 2 and the rolling rotor. A vent hole is set between the sealed vane cavity and the high-pressure cavity to ensure the pressure balance on both sides of the vane 2, reduce the movement resistance of the vane, and connect the high-pressure gas to the rear end of the slider. When the rotor inhales, it plays a boosting role in the reciprocating motion of the slider, ensuring that the vane 2 is in close contact with the rolling rotor, ensuring the working stability of the compressor, avoiding the phenomenon of high power consumption or direct shutdown of the vane reciprocating motion, and improving the working efficiency of the compressor; 3. By splitting the main structure of the pump into a cylinder head 1, a cylinder part 1, a middle partition, a cylinder part 2, and a cylinder head 2, it is convenient to form a two-stage cylinder hole, which has a simple structure and is easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural exploded view of a two-stage rolling rotor pump body according to Embodiment 1 of the present invention; Figure 2 A top view of the structure of a two-stage rolling rotor pump body according to Embodiment 1 of the present invention; Figure 3 for Figure 2 Middle AA section; Figure 4 for Figure 2 Middle BB section; In the figure: 1, housing; 2, cylinder hole 1; 3, cylinder hole 2; 4, rolling rotor; 5, crankshaft; 6, connecting groove; 7, annular connecting part; 8, mounting part 1; 9, mounting part 2; 10, high-pressure chamber; 11, exhaust hole 1; 12, exhaust hole 2; 13, exhaust valve 1; 14, exhaust valve 2; 15, slide vane 1; 16, slide vane 2; 17, vent hole; 18, exhaust hole 3; 19, fastening hole 1; 20. Connecting hole; 21. Cylinder head 1; 22. Cylinder part 1; 23. Middle partition; 24. Cylinder part 2; 25. Cylinder head 2; 26. Air inlet; 27. Air inlet pipe; 28. Screw hole; 29. ​​Sealing ring 1; 30. Sealing ring 2; 31. Slide groove 1; 32. Slide groove 2; 33. Spring; 34. Cylinder inlet; 35. Sealing spring pin; 36. Exhaust silencer cover; 37. Mounting table. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within 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 directions or positional relationships are based on the directions or positional relationships shown in the drawings, or are the directions or positional relationships in which the invented product is usually placed when used. They are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example 1

[0026] like Figure 1-4As shown, a two-stage rolling rotor 4 pump body includes a shell 1 and a pump body arranged in the shell 1, the pump body is provided with a cylinder hole 2 and a cylinder hole 3, the cylinder hole 2 and the cylinder hole 3 are respectively provided with a rolling rotor 4, the pump body includes a crankshaft 5 for driving the rolling rotor 4, the inner bottom of the shell 1 is provided with a connecting groove 6, the middle of the connecting groove 6 is provided with an annular connecting portion 7, the pump body is provided with a mounting portion 8 for engaging with the connecting groove 6, and the pump body is provided with a mounting portion 8 for engaging with the annular connecting portion 7. The mounting portion 9, a high-pressure cavity 10 is formed between the connecting groove 6, the annular connecting portion 7, and the pump body, the pump body is provided with an exhaust hole 12 for connecting the high-pressure cavity 10 and the cylinder hole 3, the pump body is provided with an exhaust valve 14 corresponding to the position of the exhaust hole 12, the pump body is provided with a vane cavity for connecting the vane 16, a vent hole 17 for balancing the air pressure at both ends of the vane 16 is provided between the high-pressure cavity 10 and the vane cavity, and the outer shell 1 is provided with an exhaust hole 3 18 for connecting the high-pressure cavity 10 and the outside of the outer shell 1.

[0027] In the above scheme, the pump body is connected and limited by the shell 1, and the shell 1 is used to connect the cover body to form a compressor shell structure. The pump body is provided with two cylinder holes, which cooperate with the crankshaft 5 and the rolling rotor 4 to realize two-stage gas compression. The high-pressure cavity 10 is formed by the connection groove 6 in the shell 1 and the mounting part 1 8, and the annular connecting part 7 and the mounting part 2 9. The exhaust hole 2 12 is provided to discharge the compressed gas in the cylinder hole 2 3 to the high-pressure cavity 10, and finally the gas in the high-pressure cavity 10 is discharged from the compressor closed shell structure through the exhaust hole 3 18. A closed vane cavity is provided on the cylinder part 24, and a spring 33 is provided in the vane cavity to drive the vane 2 16 to slide in the vane cavity to achieve cooperation with the rolling rotor 4. The 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 vane cavity, which is convenient for balancing the air pressure at both ends of the vane 2 16. The vent hole 17 connects the high-pressure gas to the rear end of the slider, which plays a boosting role when the rolling rotor 4 inhales air, and plays a role of pressure balance and boosting for the reciprocating motion of the slider, thereby ensuring stable contact between the vane and the rolling rotor 4.

[0028] A circular connecting groove 6 and an annular connecting portion 7 are arranged at the bottom of the inner hole of the housing 1 , and the connecting groove 6 and the annular connecting portion 7 are arranged concentrically.

[0029] Furthermore, the pump body includes a cylinder head 21, a cylinder part 22, a middle partition 23, a cylinder part 24, and a cylinder head 25 which are connected in sequence by a fastener 1. The cylinder head 25 includes a mounting part 1 8 and a mounting part 2 9. The cylinder head 21 is connected to the outer casing 1 by a fastener 2.

[0030] The cylinder head 21, the cylinder part 22, the middle partition 23, the cylinder part 24 and the cylinder head 25 are connected by fastener 1 to ensure the connection stability. After the pump body is engaged with the connecting groove 6 and the annular connecting part 7 of the outer shell 1, the outer shell 1 and the pump body are locked by fastener 2, which is convenient for installation and maintenance.

[0031] A threaded hole is provided on the cylinder cover 21, and a fastening hole 19 is correspondingly provided on the cylinder part 22, the middle partition plate 23, the cylinder part 24, and the cylinder cover 25 to match the threaded hole to connect the fastener 1.

[0032] Furthermore, an air inlet 26 is provided on the side of the outer shell 1, an air inlet pipe 27 is provided between the cylinder hole 2 and the air inlet 26, a cylinder hole 2 is provided in the middle of the cylinder part 1 22, a cylinder hole 2 3 is provided in the middle of the cylinder part 24, and a rolling rotor 4 is provided in the cylinder hole, and the rolling rotor 4 is rotatably connected to the eccentric shaft of the crankshaft 5.

[0033] External gas is introduced into cylinder hole 1 through intake pipe 27 for primary compression. Cylinder hole 1 2 and cylinder hole 2 3 are correspondingly opened in the middle of cylinder part 1 22 and cylinder part 2 24 to cooperate with cylinder head 1 21, middle partition plate 23 and cylinder head 25 to form a chain of two cylinder holes, and other compression is realized by cooperating with crankshaft 5 and rolling rotor 4. The structure is simple.

[0034] Furthermore, a sealing ring 29 is provided between the mounting portion 1 8 and the connecting groove 6 , and a sealing ring 30 is provided between the mounting portion 2 9 and the annular connecting portion 7 .

[0035] By providing a sealing ring 1 29 and a sealing ring 2 30, the air tightness of the connection between the mounting part 1 8 and the connecting groove 6, and between the mounting part 2 9 and the annular connecting part 7 is ensured to avoid gas leakage.

[0036] The cylinder head 25 is a cylindrical structure, the mounting part 1 8 is located at the bottom of the cylindrical structure, and the mounting part 2 9 includes a circular annular protrusion structure arranged at the center of the bottom of the cylindrical structure. A crankshaft hole is provided in the middle of the circular annular protrusion structure to be rotatably connected with the crankshaft 5.

[0037] The inner hole of the annular connecting part 7 is snap-connected with the outer ring of the mounting part 2 9 , and an oil hole for oil flow at the end of the crankshaft 5 is provided between the inner hole of the annular connecting part 7 and the inside of the compressor housing.

[0038] Furthermore, a vane groove 31 is provided on the cylinder member 22, a vane 15 and a spring 33 for returning the vane 15 are slidably arranged in the vane groove 31, and the vane groove 31 is communicated with the interior of the compressor housing.

[0039] The vane 15 and the spring 33 are connected through the vane groove 131, and the vane 15 is kept in contact with the rolling rotor 4 through the spring 33, so as to realize the gas compression function. The vane groove 131 is connected with the inside of the compressor housing to ensure the pressure balance on both sides of the vane 15, which is convenient for the sliding of the vane 15.

[0040] Furthermore, the second cylinder member 24 is provided with a cylinder inlet 34 communicating with the interior of the compressor housing, the vane cavity comprises a second vane groove 32 , and a sealing spring pin 35 is provided at the end of the second vane groove 32 .

[0041] The medium-pressure gas in the compressor housing is sucked into the cylinder hole 23 through the cylinder inlet 34 for secondary compression, the spring 33 and the vane 2 16 are connected through the vane groove 2 32, and the outer end of the vane groove 2 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 to avoid gas leakage.

[0042] The sealing spring pin 35 can be connected by thread connection or interference fit. The first slide slot 31 and the second slide slot 32 both include a spring 33 slot and a sliding straight slot. The spring 33 slot is used to set the spring 33, and the sliding straight slot is used for the slide to slide. The cylinder cover 25 and the middle partition 23 are provided with raised parts to close the upper and lower sides of the second slide slot 32.

[0043] Furthermore, the cylinder head 21 is provided with an exhaust hole 11 for communicating with the cylinder hole 2, the cylinder head 21 is provided with an exhaust valve 13 corresponding to the position of the exhaust hole 11, and the cylinder head 21 is provided with an exhaust silencer cover 36.

[0044] The exhaust hole 11 on the cylinder head 21 is used to discharge the medium-pressure gas that has undergone primary compression in the cylinder hole 2 into the interior of the compressor housing. The exhaust valve 13 is used to prevent gas backflow. The exhaust silencer cover 36 is used to reduce exhaust noise.

[0045] The exhaust valve 1 13 and the exhaust valve 2 14 both include an exhaust valve plate and a limit plate for limiting the opening of the exhaust valve plate. The compressor housing refers to the outer shell 1 and the cover body.

[0046] Furthermore, a plurality of mounting platforms 37 are provided at the inner hole of the housing 1 , screw holes 28 are provided on the mounting platforms 37 , and connecting holes 20 corresponding to the screw holes 28 are provided on the cylinder cover 21 .

[0047] The fastening between the housing 1 and the pump body is achieved by corresponding connecting screws at the connecting holes 20 and the screw holes 28 .

[0048] The fastener 1 and the fastener 2 include screws. The crankshaft 5 is rotatably connected to the middle of 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 .

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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: The cylinder head is provided with an exhaust hole 1 for communicating with the cylinder hole 1, the cylinder head is provided with an exhaust valve 1 corresponding to the position of the exhaust hole 1, and the cylinder head is provided with an exhaust silencer cover.

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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