CN208734541U - A kind of two-stage screw compressor - Google Patents

Abstract

A kind of two-stage screw compressor, including first, second motor, first and second grades of compression members, it is separated between second motor and second level compression member by second level air-breathing lid and second level air-breathing end cap, second motor is mounted on second level air-breathing and covers, second level air-breathing end cap is fixed on the inside that second level air-breathing covers and is placed in the second motor, there is second level oil sealing in the inside of second level air-breathing end cap, feature: second level suction end has covered third oil duct, the import of third oil duct one end is located at by the oil sealing of the second level and the side far from the second motor, the outlet of the other end extend to on the interface of second level air-breathing lid；Second level air-breathing has covered the 5th oil duct, the import of the 5th oil duct one end is communicated with the outlet of third oil duct, the outlet of the other end extends to the outer surface of second level air-breathing lid circumferencial direction, the exit connected pipes of 5th oil duct, oil pipe lead in the lower component of air pressure.The pressure of oil seepage is reduced, the service life is extended；Structure is simple, operation easy to install.

Description

A kind of two-stage screw compressor

Technical field

The utility model belongs to Compressor Technology field, and in particular to a kind of two-stage screw compressor is to existing twin-stage The improvement of the structure of helical-lobe compressor.

Background technique

Two-stage screw compressor host in prior art, such as Chinese utility model patent Authorization Notice No. " a kind of double-machine two-stage screw type compressor of magneto driving " disclosed in CN205858671U, specifically by Fig. 1 to Fig. 5 institute It discloses, which includes first motor 10, the second motor 20, first order compression member 30 and second level compression unit Part 40, the first motor 10 directly drive the work of first order compression member 30 and carry out first order gas compression, second electricity Machine 20 directly drives the work of second level compression member 40 and the compressed gas of first order compression member 30 is carried out the second second compression, By between first order air-breathing lid 34 and first order air-breathing end cap 35 between the first motor 10 and first order compression member 30 It separates, the first motor 10 is fixedly mounted on the first order air-breathing lid 34, and the first order air-breathing end cap 35 is solid It is scheduled on first order air-breathing lid 34 and is placed in the inside of first motor 10, is equipped with first in the inside of first order air-breathing end cap 35 Grade oil sealing 36, is equipped with first-class bearing 37 in the first air-breathing lid 34；Second motor 20 and second level compression member It is spaced apart between 40 by second level air-breathing lid 44 and second level air-breathing end cap 45, second motor 20 is fixedly mounted on institute It states on second level air-breathing lid 44, the second level air-breathing end cap 45 is fixed on second level air-breathing lid 44 and is placed in the second motor 20 inside, in the second level, the inside of air-breathing end cap 45 is equipped with second level oil sealing 46, and is equipped in the second air-breathing lid 44 Secondary bearing 47.

In first order compression member 30, the first oil duct 351, first oil duct are machined on first order air-breathing end cap 35 The import of 351 one end is located at 36 side of first order oil sealing and the side far from first motor 10, the outlet of 351 other end of the first oil duct The interface with first order air-breathing lid 34 is extended to, the second oil duct 341, the second oil duct 341 1 are processed on first order air-breathing lid 34 The import at end is communicated with the outlet of 351 other end of the first oil duct, the outlet of 341 other end of the second oil duct extends to first order compression Air inlet side in component 30 and close to the first order.In second level compression member 40, it is machined on second level air-breathing end cap 45 Third oil duct 451, the import of described 451 one end of third oil duct are located at the one of 46 side of second level oil sealing and separate second motor 20 Side, the outlet of 451 other end of third oil duct extend to the interface with second level air-breathing lid 44, process on second level air-breathing lid 44 4th oil duct 441, the import of 441 one end of the 4th oil duct is communicated with the outlet of 451 other end of third oil duct, the 4th oil duct 441 is another The outlet of one end extends to the air inlet side in second level compression member 40 and close to the second level.Two-stage screw compressor work When, system can be passed through lubricating oil to bearing, for lubricating bearing, the first oil duct 351, the second oil duct 341,451 and of third oil duct The processing purpose of 4th oil duct 441 is led to bearing oil in first order compression member 30 and second level compression member 40, It is handled in the other component for being passed through compressibility after compressor compresses are discharged, finally continues to be passed through progress bearing profit at bearing It is sliding, form oil circulation.In first order compression member 30, the outlet of the second oil duct 341 is in first order compression member 30 Air inlet side, pressure is lower, and lower than the pressure at first-class bearing 37, therefore the lubricating oil at first-class bearing 37 can be smoothly Be discharged in first order compression member 30, will not accumulate between first order oil sealing 36 and first-class bearing 37, in order to avoid the first order It the damage of oil sealing 36 and is leaked into first motor 10 from the installation gap of part each in the space.In second level compression member In 40, what the outlet of the 4th oil duct 441 led to is the air inlet side of the second level in second level compression member 40, second level pressure The gas mixture at air inlet in contracting component 40 is that the oil gas increased through the compressed pressure of first order compression member 30 mixes Object is closed, so the air pressure at the outlet of the 4th oil duct 441 may be above the air pressure at second level bearing 47, second level bearing Lubricating oil at 47 is difficult to be discharged to inside second level compression member 40, causes between second level oil sealing 46 and second level bearing 47 Accumulate, is easily damaged second level oil sealing 46, and probably leak into second from the installation gap of part each in the space It is final to influence the work of the second motor 20 and shorten its service life in motor 20.

In view of above-mentioned prior art, it is necessary to be subject to rational modification to the structure of existing two-stage screw compressor.For this purpose, this Applicant has made actively effectively to explore, and forms technical solution described below finally.

Summary of the invention

The purpose of this utility model is to provide for a kind of two-stage screw compressor that oil sealing permeability probability can be effectively reduced, It can prevent the bearing oil in the compression member of the second level from penetrating into the second motor, keep two-stage screw compressor more normal effective Work, avoid shortening the service life of compressor because motor component pollutes.

What the purpose of this utility model was such to reach, a kind of two-stage screw compressor, including first motor, the second electricity Machine, first order compression member and second level compression member, the first motor directly drive the work of first order compression member and carry out First order compression, second motor direct-drive second level compression member work the compressed gas of first order compression member Second level compression is carried out, passes through second level air-breathing lid and second level air-breathing between second motor and second level compression member End cap is spaced apart, and second motor is fixedly mounted on the second level air-breathing and covers, and the second level air-breathing end cap is solid It is scheduled on the inside that second level air-breathing covers and is placed in the second motor, the inside of air-breathing end cap is equipped with second level oil in the second level Envelope, it is characterised in that: the second level suction end, which covers, is machined with third oil duct, and the import of the third oil duct one end is located at the By the second level oil sealing and outlet of side, the third oil duct other end far from the second motor extends to the friendship with second level air-breathing lid On interface；The second level air-breathing, which covers, is machined with the 5th oil duct, the import of the 5th oil duct one end and third oil The outlet in road communicates, and the outlet of the 5th oil duct other end extends to the outer surface of second level air-breathing lid circumferencial direction, in the 5th oil The exit connected pipes in road, the oil pipe lead in the lower component of air pressure.

In a specific embodiment of the utility model, the oil pipe leads to the lower two-stage screw compression of air pressure In the oil piping system of machine, lubrication oil circulation is formed.

In another specific embodiment of the utility model, the first order compression member includes first order shell Body, first order male rotor, first order female rotor, the first order male rotor and the intermeshing of first order female rotor are installed on institute In the inner cavity for the first order shell stated；The second level compression member includes second level shell, second level male rotor, the second level Female rotor, the second level male rotor and the intermeshing of second level female rotor are installed on the inner cavity of the second level shell In.

In another specific embodiment of the utility model, the first order male rotor is located at first order female rotor The surface of short transverse, the second level male rotor are located at the surface of second level female rotor short transverse.

In another specific embodiment of the utility model, the two-stage screw compressor further includes having connection Level-one housing cavity and second level housing cavity and the body tube being integrally formed with first order shell and second level shell.

In a specific embodiment in turn of the utility model, the first order shell is close to first motor One end is provided with air inlet, and the oil pipe leads to the space being connected in first order shell with air inlet.

In the utility model more and in a specific embodiment, the first order male rotor and second level male rotor The two is arranged in parallel and is located in same level.

In the utility model again and then in a specific embodiment, the first motor and the second motor are permanent magnetism Motor.

The utility model again more and in a specific embodiment, the first order compression member further includes first Grade air-breathing end cap, first order oil sealing, first-class bearing, first order oil sealing axle sleeve and first order axle sleeve washer, wherein the first order is oily The first order oil for being sealed and placed on the inner ring of first order air-breathing end cap and being set on the first order male rotor axis of first order male rotor It seals on axle sleeve, the inner ring of first-class bearing is pressed against on the shaft shoulder of first order male rotor axis by first order axle sleeve washer, described First order oil seal shaft set abut against on first order axle sleeve washer, the first order oil sealing axle sleeve and first order axle sleeve washer two The optional one of person is machined with the sealing chamfering of installation sealing ring on the one end being in contact.

In the utility model more and then in a specific embodiment, the second level compression member further includes second Grade air-breathing end cap, second level oil sealing, second level bearing, second level oil sealing axle sleeve and second level axle sleeve washer, wherein the second level is oily The second level oil for being sealed and placed on the inner ring of second level air-breathing end cap and being set on the second level male rotor axis of second level male rotor It seals on axle sleeve, the inner ring of second level bearing is pressed against on the shaft shoulder of second level male rotor axis by second level axle sleeve washer, described Second level oil seal shaft set abut against on the axle sleeve washer of the second level, the second level oil sealing axle sleeve and second level axle sleeve washer two The optional one of person is machined with the sealing chamfering of installation sealing ring on the one end being in contact.

The utility model due to one of after adopting the above structure, having the advantage that, by the second level in the compression member of the second level Lubricating oil between oil sealing bearing adjacent thereto by third oil duct, the 5th oil duct and external oil pipe be smoothly led to air pressure compared with In low component, thus the pressure that lubricating oil leaks from component assembly gaps other in oil sealing or the space is reduced, extended The service life of motor；External oil pipe, is passed through the space being connected in first order shell with air inlet by the two of advantage, and first The air pressure in space being connected in grade shell with air inlet is lower, can make the lubricating oil between second level oil sealing and second level bearing Easier to be discharged into first order compression member, structure is simple, is easily installed operation；The three of advantage, in first order oil sealing axle sleeve Chamfering sealing knot is both increased between first order axle sleeve washer and between second level oil sealing axle sleeve and second level axle sleeve washer Structure further reduced the tendency that bearing oil is leaked from the installation gap of these components；The four of advantage, the technical program The 4th oil duct is changed to the 5th oil duct on the basis of existing technology, and installs the oil pipe being connected to first order enclosure interior additional, together When increase chamfering sealing structure, it is contaminated relative to motor although increasing process and assemble process and processing cost, shorten For the economic loss of electrical machinery life, the technical program can obtain better economic and social benefit.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of two-stage screw compressor described in the prior art.

Fig. 2 is the partial enlarged view of structure at the first order oil sealing of two-stage screw compressor described in the prior art.

Fig. 3 is the partial enlarged view of structure at the second level oil sealing of two-stage screw compressor described in the prior art.

Fig. 4 is the A-A cross-sectional view of Fig. 1.

Fig. 5 is the B-B cross-sectional view of Fig. 1.

Fig. 6 is the structural schematic diagram of two-stage screw compressor described in the utility model.

Fig. 7 is the partial enlarged view of structure at the first order oil sealing of two-stage screw compressor described in the utility model.

Fig. 8 is the partial enlarged view of structure at the second level oil sealing of two-stage screw compressor described in the utility model.

Fig. 9 is the C-C partial sectional view of Fig. 6.

Figure 10 is the D-D partial sectional view of Fig. 6.

Figure 11 is the outline drawing of two-stage screw compressor described in the utility model.

In figure: 10. first motors；20. the second motor；30. first order compression member, 31. first order shells, 311. into Port, 32. first order male rotors, 321. first order male rotor axis, 33. first order female rotors, 331. first order female rotor axis, 34. first order air-breathing lid, 341. second oil ducts, 35. first order air-breathing end caps, 351. first oil ducts, 36. first order oil sealings, 37. First-class bearing, 38. first order oil sealing axle sleeves, 39. first order axle sleeve washers, 391. first order sealing rings；40. the second level is compressed Component, 41. second level shells, 42. second level male rotors, 421. second level male rotor axis, 43. second level female rotors, 431. Second level female rotor axis, 44. second level air-breathing lids, 441. the 4th oil ducts, 442. Five-channels；45. second level air-breathing end cap, 451. Third oil duct, 46. second level oil sealings, 47. second level bearings, 48. second level oil sealing axle sleeves, 49. second level axle sleeve washers, 491. Second level sealing ring；50. body tube；60. oil pipe.

Specific embodiment

Applicant will elaborate in conjunction with attached drawing by way of examples below, but not to the description of embodiment The limitation to technical solutions of the utility model, it is any according to the utility model design it is made be only it is formal rather than Substantive equivalent transformation is regarded as category of the technical solutions of the present invention.

Fig. 6 to Figure 11 is please referred to, the utility model relates to a kind of two-stage screw compressors, including first motor 10, second Motor 20, first order compression member 30, second level compression member 40 and body tube 50, the first order compression member 30 are wrapped Include first order shell 31, first order male rotor 32, first order female rotor 33, first order air-breathing lid 34, first order air-breathing end cap 35, First order oil sealing 36, first-class bearing 37, first order oil sealing axle sleeve 38 and first order axle sleeve washer 39, the second level compression Component 40 includes second level shell 41, second level male rotor 42, second level female rotor 43, second level air-breathing lid 44, second level suction Gas end cap 45, second level oil sealing 46, second level bearing 47, second level oil sealing axle sleeve 48 and second level axle sleeve washer 49.Described In left and right arrangement, the first order male rotor 32 and first order female rotor 33 are mutual for first order shell 31 and second level shell 41 Engagement is installed in the inner cavity of first order shell 31, and the first order male rotor 32 and first order female rotor 33 are in upper and lower cloth It sets, first order male rotor 32 is located at the surface of 33 short transverse of first order female rotor, the first order sun in the present embodiment Rotor 32 has each extended over first order male rotor axis 321 at the both ends of length direction, and the first order female rotor 33 is in length The both ends in direction have each extended over first order female rotor axis 331, the first order male rotor axis 321 and first order female rotor axis 331 distinguish hub setting on the first order air-breathing lid 34 of 31 one end of first shell and the bearing block of the other end by bearing；Described Second level male rotor 42 and the intermeshing of second level female rotor 43 are installed in the inner cavity of second level shell 41, the second level Male rotor 42 and second level female rotor 43 in arranging up and down, and second level male rotor 42 is located at second level female rotor 43 in the present embodiment The surface of short transverse, the second level male rotor 42 have each extended over second level male rotor axis at the both ends of length direction 421, the second level female rotor 43 has each extended over second level female rotor axis 431 at the both ends of length direction, and described Second level male rotor axis 421 and second level female rotor axis 431 distinguish hub setting in the second level of 41 one end of second level shell by bearing On the bearing block of air-breathing lid 44 and the other end.The body tube 50 be connected to first order shell 31 and second level shell 41 and with First order shell 31 and second level shell 41 are integrally formed, the discharged first order compressed gas from first order compression member 30 It is passed through in second level compression member 40 by body tube 50.The first order shell 31 is in one end far from body tube 50 On be provided with air inlet 311.The first motor 10 connect with first order air-breathing lid 34 and directly drives first order male rotor axis 321 rotations carry out first order gas compression so that first order male rotor 32 and first order female rotor 33 be driven to be intermeshed；Institute It states the second motor 20 and the rotation of second level male rotor axis 421 is connect and directly driven with second level air-breathing lid 44, thus driving second Grade male rotor 42 and second level female rotor 43 are intermeshed, and are carried out to the gas through first order compression inputted from body tube 50 Second second compression is to obtain final required gas.

The first order air-breathing end cap 35 is fixed on first order air-breathing lid 34 and is placed in the inside of first motor 10, The first-class bearing 37 being set on first order male rotor axis 321 is installed in first order air-breathing lid 34.The first order in order to prevent The lubricating oil of bearing 37 enters in first motor 10, is equipped with first order oil sealing 36, institute in the first air-breathing end cap 35 The first order oil sealing 36 stated is sheathed on first order oil sealing axle sleeve 38, and the first order oil sealing axle sleeve 38 is sheathed on first order sun On armature spindle 321, the inner ring of the first-class bearing 37 is pressed against first order male rotor axis 321 by first order axle sleeve washer 39 The shaft shoulder on, the first order oil sealing axle sleeve 38 abuts against on first order axle sleeve washer 39.Add on first order air-breathing end cap 35 Work has the first oil duct 351, and the import of described first oil duct, 351 one end is located at by first order oil sealing 36 and far from first motor 10 Side, the outlet of 351 other end of the first oil duct extend to the interface with first order air-breathing lid 34, add on first order air-breathing lid 34 The second oil duct of work 341, the import of 341 one end of the second oil duct communicates with the outlet of 351 other end of the first oil duct, the second oil duct 341 The outlet of the other end extends to the space being connected in first order shell 31 with air inlet 312.First oil duct 351 and the second oil duct 341 connections form oil circulation, make to pass through the first oil duct 351 and the second oil for lubricating the lubricating oil of bearing at first order oil sealing 36 Road 341 flows in first order compression member 30.Compared with the existing technology, the technical program the difference is that: change it is existing The lubricating oil at second level oil sealing 46 is passed through the structure inside the biggish second level compression member 40 of gas pressure intensity in technology, and It is to be passed through in the lower component of air pressure, in the present embodiment, the lower component of this air pressure preferentially selects first order compression member 30 inside is especially passed through the space being connected in first order shell 31 with air inlet 311.Specific structure is: described the Second level air-breathing end cap 45 is fixed on second level air-breathing lid 44 and is placed in the inside of the second motor 20, in second level air-breathing lid 44 The second level bearing 47 being set on second level male rotor axis 421 is installed.In order to prevent the lubricating oil of second level bearing 47 into Enter in the second motor 20, second level oil sealing 46, the second level oil sealing 46 are installed in the second air-breathing end cap 45 It is sheathed on second level oil sealing axle sleeve 48, the second level oil sealing axle sleeve 48 is sheathed on second level male rotor axis 421, described The inner ring of second level bearing 47 is pressed against on the shaft shoulder of second level male rotor axis 421 by second level axle sleeve washer 49, described Second level oil sealing axle sleeve 48 abuts against on second level axle sleeve washer 49.Third oil is machined on the second level air-breathing end cap 45 Road 451, the import of 451 one end of third oil duct are located at 46 side of second level oil sealing and the side far from the second motor 20, the third The outlet of 451 other end of oil duct extend to on the interface of second level air-breathing lid 44；Add on the second level air-breathing lid 44 Work has the 5th oil duct 442, and the import of 442 one end of the 5th oil duct is communicated with the outlet of the third oil duct 451, the 5th oil duct The outlet of 442 other ends extends to the outer of 44 circumferencial direction of second level air-breathing lid, connects oil in the exit of the 5th oil duct 442 Pipe 60, the oil pipe 60 lead to the space being connected in first order shell 31 with air inlet 311.In first shell 31 and air inlet The gas of the inner space of 311 connections is uncompressed, and air pressure is lower, then existing at second level oil sealing 46 with 60 exit of oil pipe Pressure difference, therefore the lubricating oil between second level oil sealing 46 and second level bearing 47 can be more easily by third oil duct the 451, the 5th Oil duct 442 and external oil pipe 60 are led in first order compression member 30, so that lubricating oil will not be in second level oil sealing 46 and second Accumulate between grade bearing 47, facilitate rationally recycling for lubricating oil, reduces the tendency that lubricating oil penetrates into the second motor 20, Extend the service life of motor.

Please continue to refer to Fig. 7 and Fig. 8, in first order compression member 30, the first order oil sealing axle sleeve 38 and the first order Both axle sleeve washers 39 optionally one is machined with the sealing chamfering of installation sealing ring on the one end being in contact, excellent in the present embodiment First select to open up the sealing chamfering for installing first order sealing ring 391 on first order axle sleeve washer 39, prevent lubricating oil from It is seeped into first motor 10 between first order oil sealing axle sleeve 38 and first order axle sleeve washer 39.It is also in second level compression member 40 In this way, both described second level oil sealing axle sleeve 48 and second level axle sleeve washer 49 optionally one are processed on the one end being in contact There is the sealing chamfering of installation sealing ring, preferentially selects to be opened up on second level axle sleeve washer 49 for installing second in the present embodiment The sealing chamfering of grade sealing ring 491, prevents lubricating oil to be seeped between second level oil sealing axle sleeve 48 and second level axle sleeve washer 49 In second motor 20.

Claims (10)

1. a kind of two-stage screw compressor, including first motor (10), the second motor (20), first order compression member (30) and Two-stage compression component (40), the first motor (10) directly drive first order compression member (30) work and carry out first order pressure Contracting, second motor (20) directly drives second level compression member (40) work, and first order compression member (30) is compressed Gas carries out second level compression, passes through air-breathing lid in the second level between second motor (20) and second level compression member (40) (44) it is spaced apart with second level air-breathing end cap (45), second motor (20) is fixedly mounted on the second level air-breathing lid (44) on, the second level air-breathing end cap (45) is fixed on second level air-breathing lid (44) and is placed in the interior of the second motor (20) Portion is equipped with second level oil sealing (46) in the inside of second level air-breathing end cap (45), it is characterised in that: the second level air-breathing Third oil duct (451) are machined on end cap (45), the import of third oil duct (451) one end be located at second level oil sealing (46) it is other and The outlet of side, third oil duct (451) other end far from the second motor (20) extends to and second level air-breathing lid (44) On interface；Be machined with the 5th oil duct (442) on the second level air-breathing lid (44), the 5th oil duct (442) one end into Mouth is communicated with the outlet of the third oil duct (451), and the outlet of the 5th oil duct (442) other end extends to second level air-breathing lid (44) outer surface of circumferencial direction, in the exit connected pipes (60) of the 5th oil duct (442), the oil pipe (60) leads to gas It presses in lower component.

2. a kind of two-stage screw compressor according to claim 1, it is characterised in that the oil pipe (60) leads to air pressure In the oil piping system of lower two-stage screw compressor, lubrication oil circulation is formed.

3. a kind of two-stage screw compressor according to claim 1, it is characterised in that the first order compression member It (30) include first order shell (31), first order male rotor (32), first order female rotor (33), the first order male rotor (32) it is installed in the inner cavity of the first order shell (31) with first order female rotor (33) intermeshing；The second level Compression member (40) includes second level shell (41), second level male rotor (42), second level female rotor (43), the second level Male rotor (42) and second level female rotor (43) intermeshing are installed in the inner cavity of the second level shell (41).

4. a kind of two-stage screw compressor according to claim 3, it is characterised in that the first order male rotor (32) Positioned at the surface of first order female rotor (33) short transverse, the second level male rotor (42) is located at second level female rotor (43) surface of short transverse.

5. a kind of two-stage screw compressor according to claim 3, it is characterised in that the two-stage screw compressor is also Include connection first order shell (31) inner cavity and second level shell (41) inner cavity and with first order shell (31) and second level shell The body tube (50) that body (41) is integrally formed.

6. a kind of two-stage screw compressor according to claim 3, it is characterised in that the first order shell (31) exists Be provided with air inlet (311) close to the one end of first motor (10), the oil pipe (60) lead in first order shell (31) with The space of air inlet (311) connection.

7. a kind of two-stage screw compressor according to claim 3, it is characterised in that the first order male rotor (32) It is arranged in parallel with both second level male rotors (42) and be located in same level.

8. a kind of two-stage screw compressor according to claim 1, it is characterised in that the first motor (10) and Two motors (20) are magneto.

9. a kind of two-stage screw compressor according to claim 3, it is characterised in that the first order compression member It (30) further include first order air-breathing end cap (35), first order oil sealing (36), first-class bearing (37), first order oil sealing axle sleeve (38) With first order axle sleeve washer (39), wherein first order oil sealing (36) is placed on the inner ring of first order air-breathing end cap (35) and is set in On first order oil sealing axle sleeve (38) on the first order male rotor axis (321) of first order male rotor (32), first-class bearing (37) Inner ring be pressed against on the shaft shoulder of first order male rotor axis (321) by first order axle sleeve washer (39), the first order oil Envelope axle sleeve (38) abuts against on first order axle sleeve washer (39), the first order oil sealing axle sleeve (38) and first order axle sleeve washer (39) the two optionally one is machined with the sealing chamfering of installation sealing ring on the one end being in contact.

10. a kind of two-stage screw compressor according to claim 3, it is characterised in that the second level compression member It (40) further include second level air-breathing end cap (45), second level oil sealing (46), second level bearing (47), second level oil sealing axle sleeve (48) With second level axle sleeve washer (49), wherein second level oil sealing (46) is placed on the inner ring of second level air-breathing end cap (45) and is set in On second level oil sealing axle sleeve (48) on the second level male rotor axis (421) of second level male rotor (42), second level bearing (47) Inner ring be pressed against on the shaft shoulder of second level male rotor axis (421) by second level axle sleeve washer (49), the second level oil Envelope axle sleeve (48) abuts against on second level axle sleeve washer (49), the second level oil sealing axle sleeve (48) and second level axle sleeve washer (49) the two optionally one is machined with the sealing chamfering of installation sealing ring on the one end being in contact.