CN218882511U - Roots vacuum pump with five-point mechanical sealing structure - Google Patents

Abstract

The utility model relates to a roots vacuum pump sealing technique field specifically is a five point mechanical seal structure's roots vacuum pump, the preceding terminal surface including the driving gear pump body is provided with the front end housing, the inside of front end housing is provided with second mechanical seal and fifth mechanical seal, the rear end face of the pump body is provided with the rear end cap, the inside of rear end cap is provided with first mechanical seal and fourth mechanical seal, the inside of second mechanical seal all is provided with the initiative rotor with first mechanical seal's inside, the surface movable mounting of initiative rotor has cylindrical roller bearing and deep groove ball bearing, cylindrical roller bearing is located first mechanical seal's the outside. The utility model discloses a set up five mechanical seal structure and guaranteed that pump chamber and drive disk assembly's complete isolation is sealed, realized that pump chamber and drive disk assembly's zero leakage keeps apart, realized that the zero of play axle side oil tank leaks sealedly, guaranteed screw vacuum pump's suction vacuum performance, have advantages such as sealed reliable, long service life simultaneously.

Description

Roots vacuum pump with five-point mechanical sealing structure

Technical Field

The utility model relates to a roots vacuum pump seals technical field, specifically is a five point mechanical seal structure's roots vacuum pump.

Background

The Roots vacuum pump is a vacuum pumping device which is formed by a pair of intermeshing 8-shaped rotors rotating in a pump cavity consisting of a pump body, a front end cover and a rear end cover in a synchronous and reverse high-speed manner so as to achieve the functions of air suction and air exhaust. The driving rotor and the driven rotor respectively extend out of the pump cavity and are supported by bearings, and synchronous and reverse rotation of the driving rotor and the driven rotor is achieved through gear transmission. The medium of pump intracavity suction often has different characteristics such as corrosivity, easily fire and explode, easy crystallization, needs to realize the isolation of pump chamber and both sides drive disk assembly through sealed, prevents simultaneously through sealed that the air from revealing into the pump chamber to improve the suction vacuum performance. The driving rotor and the driven rotor extend out of the pump cavity to form four sealing points with the pump cavity, so that materials in the pump cavity are prevented from leaking to the transmission parts on two sides, and lubricating oil in the front oil tank cover and the rear oil tank cover is prevented from leaking to the pump cavity; the driving rotor extends out of the front oil tank cover to form a sealing point to prevent lubricating oil in the front oil tank cover from leaking into the atmosphere, so that the roots vacuum pump needs to be sealed at five leakage points. The prior technical scheme generally adopts several structures of piston ring seal, framework oil seal and lip seal, the sealing structures have leakage in different degrees, zero leakage of five sealing points cannot be guaranteed, and the sealing structure has the defects of short sealing service life, easy wear failure, poor reliability and the like.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a five point mechanical seal structure has solved other seal structure and has sealed life-span low, the easy problem that weares and teares inefficacy, reliability are poor.

In order to achieve the above object, the utility model provides a following technical scheme: a Roots vacuum pump with a five-point mechanical sealing structure comprises a driving gear, a rear end cover, a pump body and a front oil tank cover, wherein the front end face of the pump body is provided with the front end cover, the inside of the front end cover is provided with a second mechanical seal and a fifth mechanical seal, the rear end face of the pump body is provided with the rear end cover, the inside of the rear end cover is provided with a first mechanical seal and a fourth mechanical seal, the inside of the second mechanical seal and the inside of the first mechanical seal are both provided with driving rotors, the inner surface of the first mechanical seal and the inner surface of the second mechanical seal are in contact with the outer surface of the same driving rotor, the outer surface of the driving rotor is movably provided with a cylindrical roller bearing and a deep groove ball bearing, the cylindrical roller bearing is positioned on the outer side of the first mechanical seal, the deep groove ball bearing is positioned on the outer side of the second mechanical seal, and one side of the driving rotor, which is far away from the front end cover, is provided with the driving gear, the driving gear is provided with a locking nut at one end far away from the cylindrical roller bearing, a bearing locking sleeve is arranged between the driving gear and the cylindrical roller bearing, one end of the front end cover far away from the driving gear is provided with an oil thrower disc, one end of the oil thrower disc far away from the cylindrical roller bearing is provided with an inner locking nut, one end of the front end cover far away from the pump body is fixedly provided with a front oil tank cover, the inner middle position of the front oil tank cover is provided with an oil seal retainer ring, the inner side surface of the oil seal retainer ring is provided with a third mechanical seal, the inner surface of the third mechanical seal is in contact with the outer surface of the driving rotor, one end of the front oil tank cover far away from the front end cover is fixedly provided with an organic sealing cover, the driving rotor penetrates through the front oil tank cover and the organic sealing cover, the inside of the fourth mechanical seal and the inside of the fifth mechanical seal are provided with a driven rotor, the surface of driven rotor is provided with cylindrical roller bearing and deep groove ball bearing, cylindrical roller bearing is located fourth mechanical seal's the outside, deep groove ball bearing is located fifth mechanical seal's the outside, one side that front end housing was kept away from to driven rotor is provided with driven gear, the one end that cylindrical roller bearing was kept away from to driven gear is provided with lock nut, be provided with the bearing lock sleeve between driven gear and the cylindrical roller bearing, the surface of one side of keeping away from driven gear of driven rotor is provided with the disc, the one end that driven gear was kept away from to the disc on the driven rotor is provided with lock nut, driven rotor runs through the inside of the installation pump body, the fixed surface of disc installs the bearing clamp plate.

As an optimal technical scheme of the utility model, the one end fixed mounting that the pump body was kept away from to the rear end cap has back oil tank cap.

Compared with the prior art, the utility model discloses, possess following beneficial effect:

1. the utility model discloses a, through setting up first mechanical seal, second mechanical seal, third mechanical seal, fourth mechanical seal and fifth mechanical seal, five point mechanical seal structure has guaranteed that pump chamber and drive disk assembly's complete isolation is sealed, has realized that pump chamber and drive disk assembly's zero leaks and keeps apart, has realized that the zero of play axle side oil tank leaks sealedly, has guaranteed screw vacuum pump's suction vacuum performance, has advantages such as sealed reliable, long service life simultaneously.

Drawings

FIG. 1 is a schematic diagram of a half cross-sectional view of the structure of the present invention;

FIG. 2 isbase:Sub>A schematic sectional view of the structure A-A of the present invention;

fig. 3 is a schematic sectional view of the structure B-B of the present invention.

In the figure: 1. a rear oil tank cover; 2. locking the nut; 3. a driving gear; 4. a bearing locking sleeve; 5. a cylindrical roller bearing; 6. a rear end cap; 7. a first mechanical seal; 8. a driving rotor; 9. a pump body; 10. a front end cap; 11. a second mechanical seal; 12. a deep groove ball bearing; 13. an oil slinger; 14. an inner locking nut; 15. bearing pressing plates; 16. a mechanical seal gland; 17. a third mechanical seal; 18. a machine seal oil slinger; 19. a driven gear; 20. a driven rotor; 21. a front fuel tank cap; 22. a fourth mechanical seal; 23. and a fifth mechanical seal.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

Referring to fig. 1-3, the present invention provides the following technical solutions: a Roots vacuum pump with a five-point mechanical sealing structure comprises a driving gear 3, a rear end cover 6, a pump body 9 and a front oil tank cover 21, a front end face of the pump body 9 is provided with a front end cover 10, a second mechanical seal 11 and a fifth mechanical seal 23 are arranged inside the front end cover 10, a rear end face of the pump body 9 is provided with the rear end cover 6, a first mechanical seal 7 and a fourth mechanical seal 22 are arranged inside the rear end cover 6, a driving rotor 8 is arranged inside the second mechanical seal 11 and inside the first mechanical seal 7, both the inner surface of the first mechanical seal 7 and the inner surface of the second mechanical seal 11 are in contact with the outer surface of the same driving rotor 8, a cylindrical roller bearing 5 and a deep groove ball bearing 12 are movably arranged on the outer surface of the driving rotor 8, the cylindrical roller bearing 5 is arranged outside the first mechanical seal 7, the deep groove ball bearing 12 is arranged outside the second mechanical seal 11, the driving gear 3 is arranged on one side of the driving rotor 8 far away from the front end cover 10, a locking nut 2 is arranged on one end of the driving roller bearing 3 far away from the cylindrical roller bearing 5, a bearing locking sleeve 4 is arranged between the driving roller bearing 3 and a front end cover 17, one end of the front end cover 21 which is arranged far away from the oil tank cover 21, a front oil baffle ring 16 which is arranged inside the front end cover 10, a front oil baffle ring 17 which is arranged on the front end cover which is arranged in the front end cover 21 and a fixing oil ring 17, a fixing oil baffle ring 16 which is arranged in the front oil ring 21, the driven rotor 20 is arranged inside the fourth mechanical seal 22 and inside the fifth mechanical seal 23, the cylindrical roller bearing 5 and the deep groove ball bearing 12 are arranged on the outer surface of the driven rotor 20, the cylindrical roller bearing 5 is located outside the fourth mechanical seal 22, the deep groove ball bearing 12 is located outside the fifth mechanical seal 23, the driven gear 19 is arranged on one side, away from the front end cover 10, of the driven rotor 20, the locking nut 2 is arranged at one end, away from the cylindrical roller bearing 5, of the driven gear 19, the bearing locking sleeve 4 is arranged between the driven gear 19 and the cylindrical roller bearing 5, the oil thrower 13 is arranged on the outer surface of one side, away from the driven gear 19, of the oil thrower 13 on the driven rotor 20, the locking nut 2 is arranged at one end, away from the driven gear 19, of the oil thrower 13 on the driven rotor 20, the driven rotor 20 penetrates through the inside of the installation pump body 9, and the bearing pressing plate 15 is fixedly installed on the outer surface of the oil thrower 13.

In the embodiment, a first mechanical seal 7 is arranged in a boss of a driving rotor 8 and an inner hole spigot of a rear end cover 6, a cylindrical roller bearing 5, a bearing locking sleeve 4 and a driving gear 3 are arranged, the driving rotor 8 and the cylindrical roller bearing are connected into a whole by fastening a locking nut 2, and the mechanical seal realizes the sealing of a pump cavity and a rear oil tank cover 1; the second mechanical seal 11 is arranged in a boss of the driving rotor 8 and an inner hole spigot of the front end cover 10, a deep groove ball bearing 12 and an oil thrower 13 are arranged, the second mechanical seal is connected with the driving rotor 8 into a whole by fastening an inner locking nut 14, and the mechanical seal realizes the seal of a pump cavity and a front oil tank cover 21; the third mechanical seal 17 is arranged in a pillow block of the driving rotor 8 and a spigot of a mechanical seal gland 16, realizes axial positioning through a mechanical seal oil retainer 18 and is connected with the driving rotor 8 into a whole through a locking screw, and realizes sealing of the front oil tank cover 21 and the atmosphere; the fourth mechanical seal 22 is arranged in a boss of the driven rotor 20 and an inner hole spigot of the rear end cover 6, a cylindrical roller bearing 5, a bearing locking sleeve 4 and a driving gear 3 are arranged, the fourth mechanical seal is connected with the driven rotor 20 into a whole by fastening a locking nut 2, and the mechanical seal realizes the sealing of a pump cavity and the rear oil tank cover 1; a fifth mechanical seal 23 is arranged in a shaft boss of the driven rotor 20 and an inner hole spigot of the front end cover 10, a deep groove ball bearing 12 and an oil thrower 13 are arranged, the fifth mechanical seal is connected with the driven rotor 20 into a whole by fastening an inner locking nut 14, and the mechanical seal realizes the sealing of a pump cavity and a front oil tank cover 21; the mechanical seal flushing and cooling are realized by the rotation of the oil slinger 13, oil slinging is realized, the complete isolation and sealing of the pump cavity and the transmission part are ensured by a five-point mechanical seal structure, the zero leakage isolation of the pump cavity and the transmission part is realized, the zero leakage sealing of an oil tank on the shaft outlet side is realized, the vacuum suction performance of the screw vacuum pump is ensured, and the mechanical seal structure has the advantages of reliable sealing, long service life and the like, the driving rotor 8 and the driven rotor 20 are meshed with each other to synchronously and reversely rotate at high speed in the pump cavity formed by the pump body 9, the front end cover 10 and the rear end cover 6, the locking nut 2 and the inner locking nut 14 play a role in locking, the driving rotor 8 and the driven rotor 20 are ensured not to deviate when rotating at high speed, the device can normally work, the cylindrical roller bearing 5 and the deep groove ball bearing 12 provide a rotating mode for the driving rotor 8 and the driven rotor 20, the bearing pressing plate 15 provides fixation for the oil slinger 13, the deep groove ball bearing 12 is fixed as far as possible, and the deep groove ball bearing 12 is prevented from shaking.

Specifically, one end of the rear end cover 6, which is far away from the pump body 9, is fixedly provided with the rear oil tank cover 1.

In this embodiment, the rear fuel cap 1 provides protection and sealing for the internal moving mechanism.

The utility model discloses a theory of operation and use flow: the driving rotor 8 and the driven rotor 20 are mutually meshed in a pump cavity consisting of a pump body 9, a front end cover 10 and a rear end cover 6 to synchronously and reversely rotate at high speed, a first mechanical seal 7 is arranged in a boss of the driving rotor 8 and an inner hole spigot of the rear end cover 6, a cylindrical roller bearing 5, a bearing locking sleeve 4 and a driving gear 3 are arranged, the driving rotor 8 and the driving rotor 8 are connected into a whole through a fastening locking nut 2, and the sealing of the pump cavity and a rear oil tank cover 1 is realized through the mechanical seal; the second mechanical seal 11 is arranged in a boss of the driving rotor 8 and an inner hole spigot of the front end cover 10, a deep groove ball bearing 12 and an oil thrower 13 are arranged, the driving rotor 8 and the second mechanical seal are connected into a whole by fastening an inner locking nut 14, and the mechanical seal realizes the seal of a pump cavity and a front oil tank cover 21; the third mechanical seal 17 is arranged in a shaft platform of the driven rotor 20 and a spigot of a mechanical seal gland 16, realizes axial positioning through a mechanical seal oil retainer ring 18 and is connected with the driving rotor 8 into a whole through a locking screw, and realizes sealing of the front oil tank cover 21 and the atmosphere; the fourth mechanical seal 22 is arranged in a boss of the driven rotor 20 and an inner hole spigot of the rear end cover 6, a cylindrical roller bearing 5, a bearing locking sleeve 4 and a driving gear 3 are arranged, the driven rotor 20 and the locking nut 2 are connected into a whole by fastening, and the pump cavity and the rear oil tank cover 1 are sealed by the mechanical seal; a fifth mechanical seal 23 is arranged in a shaft boss of the driven rotor 20 and an inner hole spigot of the front end cover 10, a deep groove ball bearing 12 and an oil thrower 13 are arranged, the fifth mechanical seal is connected with the driven rotor 20 into a whole by fastening an inner locking nut 14, and the mechanical seal realizes the sealing of a pump cavity and a front oil tank cover 21; the mechanical seal washing and cooling are realized by rotating the oil throwing disc 13 and splashing the oil, the five-point mechanical seal structure ensures the complete isolation and sealing of the pump cavity and the transmission part, realizes the zero leakage isolation of the pump cavity and the transmission part, realizes the zero leakage sealing of the oil tank at the shaft outlet side, ensures the vacuum suction performance of the screw vacuum pump, and has the advantages of reliable sealing, long service life and the like.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (2)

1. The utility model provides a five mechanical seal structure's roots vacuum pump, includes driving gear (3), rear end cap (6), the pump body (9) and preceding oil tank cap (21), its characterized in that: the front end face of the pump body (9) is provided with a front end cover (10), the inside of the front end cover (10) is provided with a second mechanical seal (11) and a fifth mechanical seal (23), the rear end face of the pump body (9) is provided with a rear end cover (6), the inside of the rear end cover (6) is provided with a first mechanical seal (7) and a fourth mechanical seal (22), the inside of the second mechanical seal (11) and the inside of the first mechanical seal (7) are both provided with a driving rotor (8), the inner surface of the first mechanical seal (7) and the inner surface of the second mechanical seal (11) are both in contact with the outer surface of the same driving rotor (8), the outer surface of the driving rotor (8) is movably provided with a cylindrical roller bearing (5) and a deep groove ball bearing (12), the cylindrical roller bearing (5) is located in the outer side of the first mechanical seal (7), the deep groove ball bearing (12) is located in the outer side of the second mechanical seal (11), one side, which is far away from the front end cover (10), a locking nut (3) is provided with a locking nut (2), and a cylindrical roller (3) is arranged between the cylindrical roller bearing (5) and a locking nut (4) is arranged on one end of the front end cover (3), and a locking nut (4) is arranged on the front end cover (4) and a locking nut (3) arranged on the inner side of the driving roller (3) arranged Dish (13), the one end that cylindrical roller bearing (5) was kept away from in oil slinger (13) is provided with interior lock nut (14), the one end fixed mounting that the pump body (9) was kept away from in front end housing (10) has preceding oil tank cap (21), the inside intermediate position of preceding oil tank cap (21) is provided with mechanical seal oil slinger (18), the medial surface of mechanical seal oil slinger (18) is provided with third mechanical seal (17), the internal surface of third mechanical seal (17) and the outer surface contact of initiative rotor (8), the one end fixed mounting that front end housing (10) was kept away from in preceding oil tank cap (21) has mechanical seal cover (16), initiative rotor (8) run through and install inside in front end cap (21) and mechanical seal cover (16), the inside of fourth mechanical seal (22) and fifth mechanical seal (23) inside are provided with driven rotor (20), the surface of driven rotor (20) is provided with cylindrical roller bearing (5) and deep groove (12), the outside of fourth mechanical seal (22) is located the outer side of deep groove bearing (23), driven roller bearing (19) is provided with driven gear bearing (19), driven roller bearing (19) outside driven roller bearing (19) is provided with driven roller bearing (19), driven roller bearing (19) one end of driven roller bearing (10) is kept away from one side of driven gear (19), driven roller bearing (10) is provided with driven roller bearing (19) ) The pump comprises a driven gear (19), a cylindrical roller bearing (5) and a bearing locking sleeve (4) are arranged between the driven gear (19) and the cylindrical roller bearing (5), an oil thrower (13) is arranged on the outer surface of one side, away from the driven gear (19), of the driven rotor (20), a locking nut (2) is arranged at one end, away from the driven gear (19), of the oil thrower (13) on the driven rotor (20), the driven rotor (20) penetrates through the inside of an installation pump body (9), and a bearing pressing plate (15) is fixedly arranged on the outer surface of the oil thrower (13).

2. The roots vacuum pump of a five-point mechanical seal structure of claim 1, wherein: and a rear oil tank cover (1) is fixedly arranged at one end of the rear end cover (6) far away from the pump body (9).

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