CN218991877U - Sealing structure of large pumping speed Roots pump - Google Patents
Sealing structure of large pumping speed Roots pump Download PDFInfo
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- CN218991877U CN218991877U CN202320039268.0U CN202320039268U CN218991877U CN 218991877 U CN218991877 U CN 218991877U CN 202320039268 U CN202320039268 U CN 202320039268U CN 218991877 U CN218991877 U CN 218991877U
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Abstract
The utility model relates to a sealing structure of a large pumping speed Roots pump, which consists of an O-shaped ring (3), a felt (4), a lip seal (6), a rotary seal (7), a spacer bush (8) and a rotary seal outer disc (9); the sealing structure is arranged in the center of the partition board (1) and is fixed with the sealing structure in a rotary sealing way through a threaded hole of the partition board; the shaft is separated by the spacer bush (8), the felt (4) is sleeved on the spacer bush (8), the O-shaped ring (3) is sleeved on a step extending out of the rotary seal (7), the lip seal (6) is arranged between the felt (4) and the rotary seal (7), and the rotary seal (7) is fixed on the partition board (1) through a screw; the outer surface of the rotary seal (7) is provided with a rotary seal outer disc (9). The sealing structure has the advantages of good sealing effect, simple and reliable overall structure. Good positioning and sealing with the external component can be further achieved when the sealing structure is installed.
Description
Technical Field
The utility model relates to a large pumping speed Roots pump, in particular to a sealing structure of the large pumping speed Roots pump.
Background
The Roots pump is a variable-volume vacuum pump, and the pumping is realized by moving gas under the pushing action of synchronous and reverse rotation of a pair of 8-shaped rotors in a pump cavity. The compression ratio is usually very low, and the pump is required to be matched with a backing pump for use. Along with the development demand of industry, more and more Roots vacuum pumps are widely applied to the industries of semiconductors, photovoltaics, vacuum coating and the like along with backing pumps. According to the requirements of production processes of different industries, the sealing requirements on the Roots vacuum pump are higher and higher.
The existing Roots pump sealing structure can meet the use of simple working conditions, but has the problems of short service life, incomplete sealing, easy oil leakage and the like in severe working conditions or occasions with higher requirements, thereby losing the original meaning of dry sealing.
Disclosure of Invention
The utility model aims to overcome the defects and provide the Roots vacuum pump sealing structure which is simple and reliable in structure, long in service life and good in sealing performance.
The sealing structure of the Roots vacuum pump provided by the utility model consists of an O-shaped ring, a felt, a lip seal, a rotary seal, a spacer bush and a rotary seal outer disc;
the sealing structure is arranged at the center of the partition plate and is fixed with the sealing structure in a rotary sealing way through a threaded hole of the partition plate.
The shaft is separated by the spacer bush, the felt bush is attached to the spacer bush, the O-shaped ring is sleeved on the step which is spirally sealed, the lip seal is arranged between the felt and the spiral seal, the spiral seal is fixed on the partition board through a screw, and the spiral seal outer disc is arranged outside the spiral seal.
In the installation and fixation process of the sealing structure, the O-shaped ring effectively cuts off the leakage of the vacuum pump oil from the O-shaped ring to the working chamber through extrusion deformation, and the other axial gap effectively cuts off the leakage of the vacuum pump oil to the working chamber through spin sealing and lip sealing. Therefore, the sealing structure has good sealing effect on the working chamber by the O-shaped ring, the lip seal and the rotary seal.
The sealing structure is used for sealing the working chamber and preventing the vacuum pump oil from leaking into the working chamber. Wherein the sealing structure is arranged in the center of the partition board; the partition board is of a flat plate type structure, one side of the partition board is connected with a vacuum pump cavity (a working cavity), and the other side of the partition board is connected with an oil tank; the center of the partition plate is provided with four threaded holes matched with the sealing structure; the rotary seal in the sealing structure is connected through the four threaded holes, so that the rotary seal can be fixed on the partition plate. The sealing structure is fixed on the partition board in a spin sealing mode; the sealing structure and the partition plate integrally form a partition seal, one side is a vacuum pump cavity, and the other side is an oil tank.
The spacer bush is used for separating the sealing structure from the shaft, is used for axially positioning the structure, and is used for supporting the felt and the lip seal to protect the shaft.
The felt can prevent particles such as dust in a pumped medium from entering the sealing structure, so that the dustproof effect is achieved; thereby improving the sealing effect and the service life of the sealing structure.
The O-shaped ring is a static seal and is used for effectively isolating media at two sides of the O-shaped ring, so that lubricating oil is prevented from entering the working cavity from the working cavity and polluting the air exhaust medium.
The rotary seal and the rotary seal outer disc rotate together with the shaft through the rotary seal outer disc to play a role of pushing medium, and then the rotary seal and the rotary seal outer disc are combined with the back lip seal for sealing, so that lubricating oil is effectively prevented from entering the working cavity from the working cavity.
The inner hexagon screw is used for connecting the rotary seal and the partition plate, is arranged at four threaded holes of the two parts, and is sleeved on the step which is spirally sealed and is not contacted with the felt and the lip seal.
The shaft referred to in the present utility model is the shaft of the pump and is integral with the rotor of the pump. The integral diaphragm + seal is mounted at the step of the shaft next to the rotor. The gear is connected with the shaft in a matched manner, and the gear is used for power transmission of two rotors, namely, one rotor shaft is driven by a motor, and the other rotor is synchronously driven by the gear pair. Where the gears are axially positioned together with the sealing structure.
The bearing is used for supporting a rotor structure, and is locked and fixed on a shaft through a bearing inner ring, a sealing structure and a gear together by a locking screw. The locking screw is used for fixing all parts on the shaft and plays a role in axial positioning and locking.
Drawings
FIG. 1 is a schematic view of a sectional installation structure of a Roots vacuum pump sealing structure;
FIG. 2 is an enlarged schematic view of a cross section of a seal structure;
FIG. 3 is an exploded schematic view of a seal structure;
in the figure: 1. a partition plate; 2. an inner hexagon screw; 3. an O-ring; 4. a felt; 5. a shaft; 6. lip sealing; 7. spin sealing; 8. a spacer bush; 9. spin-sealing the outer disc; 10. a bearing; 11. a gear; 12. locking screws.
Detailed Description
The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.
Examples
The utility model provides a sealing structure of a large pumping speed Roots pump, which specifically comprises a structure shown in figure 3: the diagram is an explosion schematic diagram of the sealing structure, and from left to right, the diagram is respectively:
The sealing structure is arranged in the center of the partition board 1 and is fixed with the sealing structure in a rotary sealing way through a threaded hole of the partition board; i.e. by means of 4 socket head cap screws.
Wherein the lip seal 6 is arranged between the felt 4 and the rotary seal 7; the rotary seal 7 is connected with the partition board through an inner hexagon screw. The O-shaped ring is sleeved on the step which is spirally sealed, and is not contacted with the felt and the lip seal.
The sealing structure has good sealing effect on the working chamber by the O-shaped ring, the lip seal and the rotary seal.
In addition, the sealing structure provided by the utility model has the advantages of good sealing effect, simple and reliable overall structure. Good positioning and sealing with the external component can be further achieved when the sealing structure is installed.
As shown in fig. 1 and 2, an installation schematic diagram of the sealing structure provided by the utility model is shown.
The integral diaphragm + seal is mounted at the step of the shaft next to the rotor. The gear is connected with the shaft in a matched manner, and the gear is used for power transmission of the two rotors, namely, one rotor shaft is driven by the motor, and the other rotor is synchronously driven by the gear pair. Where the gears are axially positioned together with the sealing structure.
The bearing is used for supporting the rotor structure in the integral structure, and is locked and fixed on the shaft through the bearing inner ring, the sealing structure and the gear together by the locking screw. The locking screw is used for fixing all parts on the shaft and plays a role in axial locking and positioning.
The sealing structure provided by the utility model has excellent sealing effect, simple and reliable structure and can greatly prolong the service life.
While the utility model has been described in detail in the foregoing general description, embodiments and experiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.
Claims (4)
1. The sealing structure of the large pumping speed Roots pump is characterized by comprising an O-shaped ring (3), a felt (4), a lip seal (6), a rotary seal (7), a spacer bush (8) and a rotary seal outer disc (9); the sealing structure is arranged in the center of the partition board (1) and is fixed with the sealing structure in a rotary sealing way through a threaded hole of the partition board;
the shaft is separated by the spacer bush (8), the felt (4) is sleeved on the spacer bush (8), the O-shaped ring (3) is sleeved on a step extending out of the rotary seal (7), the lip seal (6) is arranged between the felt (4) and the rotary seal (7), the rotary seal (7) is fixed on the partition board (1) through a screw, and a rotary seal outer disc (9) is arranged outside the rotary seal (7).
2. The seal of claim 1, wherein the screw is a socket head cap screw.
3. The sealing structure according to claim 2, wherein the threaded hole is adapted to an socket head cap screw; the number of the socket head cap screws is 4.
4. The sealing structure according to claim 1, characterized in that the O-ring (3) is fitted over a step extending from the screw seal (7); the O-shaped ring (3) is not contacted with the felt (4) and the lip seal (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320039268.0U CN218991877U (en) | 2023-01-07 | 2023-01-07 | Sealing structure of large pumping speed Roots pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320039268.0U CN218991877U (en) | 2023-01-07 | 2023-01-07 | Sealing structure of large pumping speed Roots pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218991877U true CN218991877U (en) | 2023-05-09 |
Family
ID=86220256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320039268.0U Active CN218991877U (en) | 2023-01-07 | 2023-01-07 | Sealing structure of large pumping speed Roots pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218991877U (en) |
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2023
- 2023-01-07 CN CN202320039268.0U patent/CN218991877U/en active Active
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