CN219993926U - Roots vacuum pump with pre-vacuum device - Google Patents
Roots vacuum pump with pre-vacuum device Download PDFInfo
- Publication number
- CN219993926U CN219993926U CN202321473608.7U CN202321473608U CN219993926U CN 219993926 U CN219993926 U CN 219993926U CN 202321473608 U CN202321473608 U CN 202321473608U CN 219993926 U CN219993926 U CN 219993926U
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- end cover
- pump
- cover
- rear end
- vacuum device
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- 238000007789 sealing Methods 0.000 claims abstract description 40
- 239000003921 oil Substances 0.000 claims abstract description 20
- 239000010687 lubricating oil Substances 0.000 claims abstract description 6
- 239000012208 gear oil Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000012864 cross contamination Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The utility model relates to a Roots vacuum pump with a pre-vacuum device, which comprises a pump body and the pre-vacuum device, wherein the front end of the pump body is provided with a front end cover, the rear end of the pump body is provided with a rear end cover, the front end cover is provided with a front cover, and the rear end cover is provided with a rear cover; the front end cover and the rear end cover are respectively provided with a pre-vacuum device, the pre-vacuum device comprises a valve body, a valve seat and a spherical valve, the valve body is fixed on the front end cover or the rear end cover and is provided with an air suction port, the air suction port extends along the horizontal direction and is communicated with an air suction cavity in the pump body, the valve seat is arranged below the valve body, the top surface of the valve seat, which is in contact with the valve body, is provided with a sealing surface, the cross section of the sealing surface is of a V-like shape, and the sealing surface forms an inverted cone frustum space for placing the spherical valve. The utility model can further prevent the oil leakage of the Roots vacuum pump, and can prevent the pumped medium from entering the lubricating oil tank at the two ends of the pump, thereby achieving the purpose of prolonging the service life of the Roots vacuum.
Description
Technical Field
The utility model relates to the technical field of vacuum equipment, in particular to a Roots vacuum pump with a pre-vacuum device.
Background
The Roots vacuum pump is a positive displacement vacuum pump in which two vane-shaped rotors which synchronously rotate in opposite directions are arranged in the pump, and fine gaps are arranged between the rotors and the inner wall of the pump shell and are not contacted with each other. The working principle of the Roots pump is similar to that of the Roots blower. Because of the continuous rotation of the rotor, the pumped gas is sucked into the space between the rotor and the pump shell (namely the suction cavity) from the air inlet and is discharged through the air outlet; because the suction cavity is in a fully closed state after suction, the gas in the pump cavity is not compressed and expanded; however, when the top of the rotor rotates past the edge of the exhaust port and the air suction cavity is communicated with the exhaust side, part of air is flushed back into the air suction cavity due to the higher air pressure of the exhaust side, so that the air pressure is suddenly increased; when the rotor continues to rotate, the gas is discharged out of the pump.
The application of the Roots vacuum pump is more and more extensive since the birth of forty of the last century, meanwhile, the research on the dynamic seal of the Roots vacuum pump is not stopped, and particularly in the last twenty years, as the Roots vacuum pump is applied to various special processes, the sealing requirement on the Roots vacuum pump is more and more severe. The types of gases conveyed by the Roots vacuum pump are more and more, and the sealing of the Roots vacuum pump is required to be suitable for the needs of various special working conditions. The biggest problem of roots vacuum pumps is oil leakage, and the dynamic seal of roots vacuum pumps can not be thoroughly solved all the time for decades.
As the inside of the Roots vacuum pump air suction cavity is in a vacuum state during normal operation, a large pressure difference exists between the pump air suction cavity and the oil tank, so that the friction force of the composite sealing element in the front end cover and the rear end cover is increased, the temperature rise of the sealing element is high, and the failure or oil leakage of the sealing element is easily accelerated; roots vacuum pumps are commonly used for pumping out toxic and harmful condensable gases, once the composite seal in an end cover fails, the pumped gas easily enters the oil tanks at the two ends of the vacuum pump and causes the pollution and quick failure of the vacuum pump oil, and in addition, because of the pressure difference, the vacuum pump oil also continuously permeates into the gas suction cavity of the pump to pollute the pumped materials.
Disclosure of Invention
The utility model aims to overcome the defects and provide the Roots vacuum pump with the pre-vacuum device, so that the problem of dynamic seal leakage of the oil tank of the Roots vacuum pump is solved, the oil leakage of the Roots vacuum pump can be further prevented, and pumped media can be prevented from entering the lubricating oil tanks at the two ends of the pump, so that the purpose of prolonging the service life of the Roots vacuum is achieved.
The purpose of the utility model is realized in the following way:
the Roots vacuum pump comprises a pump body and a pre-vacuum device, wherein the front end of the pump body is provided with a front end cover, the rear end of the pump body is provided with a rear end cover, the front end cover is provided with a front cover, the rear end cover is provided with a rear cover, a lubricating oil tank is arranged between the front end cover and the front cover, a gear oil tank is arranged between the rear end cover and the rear cover, and an air suction cavity is arranged between the front end cover and the rear end cover in the pump body; the front end cover and the rear end cover are respectively provided with a pre-vacuum device, the pre-vacuum device comprises a valve body, a valve seat and a spherical valve, the valve body is fixed on the front end cover or the rear end cover and is provided with an air suction port, the air suction port extends along the horizontal direction and is communicated with an air suction cavity in the pump body, the valve seat is arranged below the valve body, the top surface of the valve seat, which is in contact with the valve body, is provided with a sealing surface, the cross section of the sealing surface is of a V-like shape, the sealing surface forms an inverted cone frustum space for placing the spherical valve, and the center of the sealing surface is provided with an air inlet hole which extends downwards to penetrate through the valve seat.
Further, a pair of three-vane involute rotors which are horizontally arranged in parallel and meshed with each other are arranged in the pump body: the driving rotor and the driven rotor are respectively arranged in a front end cover and a rear end cover at two ends of the pump body through bearings.
Further, a bearing is arranged between the front end cover and the main shaft, and a bearing is also arranged between the rear end cover and the main shaft.
Further, a gear is arranged in the rear cover, and the gear is sleeved at the tail end of the main shaft; the driving rotor and the driven rotor make the rotors synchronously rotate at constant speed in the pump body through a pair of synchronous gears in the oil tank.
Further, the shaft outlet end of the main shaft extends out of the front cover and is connected with a coupler, and the coupler is connected with a motor.
Further, a sealing gasket is arranged between the valve body and the front end cover for sealing, and a sealing gasket is arranged between the valve body and the rear end cover for sealing.
Further, an air inlet is formed in the upper end and the lower end of the pump body respectively.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model provides a Roots vacuum pump with a pre-vacuum device, which reduces the friction force of a sealing element by reducing the pressure difference between an air suction cavity and an oil tank, reduces the abrasion of a shaft seal, prolongs the service life of the sealing element, can realize the long-term effective isolation of the air suction cavity of the Roots vacuum pump and the sealing of the oil tanks at two sides, avoids the cross contamination of a pumped medium and the oil tanks of the Roots vacuum pump, can further prevent the oil leakage of the Roots vacuum pump, and can prevent the pumped medium from entering the lubricating oil tanks at two ends of the pump, thereby greatly prolonging the service life of the Roots vacuum pump.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a front view of the present utility model.
Fig. 3 is a partial enlarged view at a of fig. 1.
Fig. 4 is a schematic structural view of the pre-vacuum apparatus of the present utility model.
Wherein:
pump body 1, front end cover 2, front cover 3, rear cover 4, rear cover 5, bearing 6, gear 7, coupling 8, motor 9, pre-vacuum device 10, valve body 101, suction port 1011, valve seat 102, sealing surface 1021, air intake 1022, ball valve 103, gasket 104, composite seal 11, driving rotor 12, driven rotor 13.
Description of the embodiments
In order to better understand the technical solution of the present utility model, the following detailed description will be made with reference to the accompanying drawings. It should be understood that the following embodiments are not intended to limit the embodiments of the present utility model, but are merely examples of embodiments that may be employed by the present utility model. It should be noted that, the description herein of the positional relationship of the components, such as the component a being located above the component B, is based on the description of the relative positions of the components in the drawings, and is not intended to limit the actual positional relationship of the components.
Example 1
Referring to fig. 1-4, fig. 1 depicts a schematic structural view of the present utility model. As shown in the figure, the Roots vacuum pump with the pre-vacuum device comprises a pump body 1 and the pre-vacuum device 10, wherein the front end of the pump body 1 is provided with a front end cover 2, the rear end of the pump body is provided with a rear end cover 4, and a pair of three-vane involute rotors which are horizontally arranged in parallel and are meshed with each other are arranged in the pump body 1: the driving rotor 12 and the driven rotor 13 are respectively arranged in the front end cover 2 and the rear end cover 4 at two ends of the pump body through bearings 6; a bearing 6 is arranged between the front end cover 2 and the main shaft, and a bearing 6 is also arranged between the rear end cover 4 and the main shaft; a gear 7 is arranged in the rear cover 5, and the gear 7 is sleeved at the tail end of the main shaft; the driving rotor 12 and the driven rotor 13 make the rotors synchronously rotate at a constant speed in the pump body through a pair of synchronous gears 7 in the oil tank.
The front end cover 2 is fixedly connected to the front end of the pump body 1 by using an inner hexagon screw, and the rear end cover 4 is fixedly connected to the rear end of the pump body 1 by using an inner hexagon screw; the front cover 2 is provided with a front cover 3, the front cover 3 is fixedly connected to the front side of the front cover 2 by using an inner hexagon screw, the rear cover 4 is provided with a rear cover 5, and the rear cover 5 is fixedly connected to the rear side of the rear cover 4 by using an inner hexagon screw.
A lubricating oil tank is arranged between the front end cover 2 and the front cover 3, a gear oil tank is arranged between the rear end cover 4 and the rear cover 5, and an air suction cavity is arranged between the front end cover 2 and the rear end cover 4 in the pump body 1; the composite seal 11 is arranged between the main shaft and the front end cover 2, the composite seal 11 is arranged between the main shaft and the rear end cover 4, and the oil tanks on the two sides of the pump body 1 effectively separate the oil tanks from the air suction cavity in the pump body 1 through the composite seal 11 in the end covers on the two ends of the pump body.
The front end cover 2 and the rear end cover 4 are respectively provided with a pre-vacuum device 10, the pre-vacuum device 10 comprises a valve body 101, a valve seat 102 and a spherical valve 103, the valve body 101 is fixed on the front end cover 2 or the rear end cover 4, the valve body 101 is provided with an air suction port 1011, the air suction port 1011 extends along the horizontal direction and is communicated with an air suction cavity in the pump body 1, the lower part of the valve body 101 is provided with the valve seat 102, the top surface of the valve seat 102 contacted with the valve body 101 is provided with a sealing surface 1021, the section of the sealing surface 1021 is in a V-like shape, the sealing surface 1021 forms an inverted cone space for placing the spherical valve 103, the center of the sealing surface 1021 is provided with an air inlet 1022, and the air inlet 1022 penetrates through the valve seat 102, namely, the air inlet of the valve seat 102 is downward arranged.
A gasket 104 is disposed between the valve body 101 and the front end cover 2 (or the rear end cover 4) for sealing, and the gasket 104 may be a polytetrafluoroethylene gasket.
The surface of the ball valve 103 and the valve seat sealing surface 1021 must have a finish of mirror finish grade.
The shaft outlet end of the main shaft extends out of the front cover 3 and is connected with a coupler 8, and the coupler 8 is connected with a motor 9.
The upper end and the lower end of the pump body 1 are respectively provided with an air inlet.
Working principle:
the utility model relates to a Roots vacuum pump with a pre-vacuum device, which comprises a valve body, a valve seat, a spherical valve head and a sealing gasket; the air suction port of the valve body is horizontally fixed on the end cover, and the valve body and the end cover are sealed through a polytetrafluoroethylene sealing gasket; the valve seat is arranged at the lower end of the valve body, the V-shaped sealing surface is vertically arranged, and the axis of the V-shaped sealing surface is provided with an air inlet; the ball valve is arranged on the V-shaped sealing surface of the valve seat, when the vacuum pump works, the pressure of the air suction cavity of the pump is gradually reduced, and when the oil tank and the air suction cavity reach a certain pressure difference, the pressure difference jacks up the ball valve and enables the pressure of the oil tank and the air suction cavity to gradually tend to be balanced, and after the pressure difference is balanced, the ball valve automatically resets to the V-shaped sealing surface of the valve seat.
The foregoing is merely a specific application example of the present utility model, and the protection scope of the present utility model is not limited in any way. All technical schemes formed by equivalent transformation or equivalent substitution fall within the protection scope of the utility model.
Claims (7)
1. A roots vacuum pump with a pre-vacuum device, characterized in that: the novel vacuum pump comprises a pump body (1) and a pre-vacuum device (10), wherein the front end of the pump body (1) is provided with a front end cover (2), the rear end of the pump body is provided with a rear end cover (4), the front end cover (2) is provided with a front cover (3), the rear end cover (4) is provided with a rear cover (5), a lubricating oil tank is arranged between the front end cover (2) and the front cover (3), a gear oil tank is arranged between the rear end cover (4) and the rear cover (5), and an air suction cavity is arranged between the front end cover (2) and the rear end cover (4) in the pump body (1); the novel vacuum pump is characterized in that the front end cover (2) and the rear end cover (4) are respectively provided with a pre-vacuum device (10), the pre-vacuum device (10) comprises a valve body (101), a valve seat (102) and a spherical valve (103), the valve body (101) is fixed on the front end cover (2) or the rear end cover (4), the valve body (101) is provided with an air suction port (1011), the air suction port (1011) extends along the horizontal direction and is communicated with an air suction cavity in the pump body (1), the valve seat (102) is arranged below the valve body (101), the top surface of the valve seat (102) contacted with the valve body (101) is provided with a sealing surface (1021), the cross section of the sealing surface (1021) is in a V-like shape, the sealing surface (1021) forms an inverted conical table space for placing the spherical valve (103), and the center of the sealing surface (1021) is provided with an air inlet hole (1022), and the air inlet hole (1022) extends downwards to penetrate the valve seat (102).
2. A roots vacuum pump with a pre-vacuum device according to claim 1, wherein: a pair of three-vane involute rotors which are horizontally arranged in parallel and meshed with each other are arranged in the pump body (1): the pump comprises a driving rotor (12) and a driven rotor (13), wherein the driving rotor (12) is arranged on a main shaft, the driven rotor (13) is arranged on a rotor shaft, the main shaft and the rotor shaft are arranged in a pump body, and the driving rotor (12) and the driven rotor (13) are respectively arranged in a front end cover (2) and a rear end cover (4) at two ends of the pump body through bearings (6).
3. A roots vacuum pump with a pre-vacuum device according to claim 1, wherein: a bearing (6) is arranged between the front end cover (2) and the main shaft, and a bearing (6) is also arranged between the rear end cover (4) and the main shaft.
4. A roots vacuum pump with a pre-vacuum device according to claim 1, wherein: a gear (7) is arranged in the rear cover (5), and the gear (7) is sleeved at the tail end of the main shaft; the driving rotor (12) and the driven rotor (13) enable the rotors to synchronously rotate at the same speed in the pump body through a pair of synchronous gears (7) in the oil tank.
5. A roots vacuum pump with a pre-vacuum device according to claim 2, wherein: the shaft outlet end of the main shaft extends out of the front cover (3) and is connected with the coupler (8), and the coupler (8) is connected with the motor (9).
6. A roots vacuum pump with a pre-vacuum device according to claim 1, wherein: a sealing gasket (104) is arranged between the valve body (101) and the front end cover (2) for sealing, and a sealing gasket (104) is arranged between the valve body (101) and the rear end cover (4) for sealing.
7. A roots vacuum pump with a pre-vacuum device according to claim 1, wherein: the upper end and the lower end of the pump body (1) are respectively provided with an air inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321473608.7U CN219993926U (en) | 2023-06-12 | 2023-06-12 | Roots vacuum pump with pre-vacuum device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321473608.7U CN219993926U (en) | 2023-06-12 | 2023-06-12 | Roots vacuum pump with pre-vacuum device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219993926U true CN219993926U (en) | 2023-11-10 |
Family
ID=88616469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321473608.7U Active CN219993926U (en) | 2023-06-12 | 2023-06-12 | Roots vacuum pump with pre-vacuum device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219993926U (en) |
-
2023
- 2023-06-12 CN CN202321473608.7U patent/CN219993926U/en active Active
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