CN217029394U

CN217029394U - Shaft seal structure of anticorrosive vacuum pump

Info

Publication number: CN217029394U
Application number: CN202220818910.0U
Authority: CN
Inventors: 柯建汝
Original assignee: Zhejiang Chuangwei Vacuum Equipment Share Co ltd
Current assignee: Zhejiang Chuangwei Vacuum Equipment Share Co ltd
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-07-22
Anticipated expiration: 2032-04-11

Abstract

The utility model provides a shaft seal structure of an anti-corrosion vacuum pump, and belongs to the technical field of vacuum pumps. It has solved the poor problem of current vacuum pump seal effect. The vacuum pump comprises a pump body, wherein a working cavity and a sealing cavity are arranged in the pump body, the shaft seal structure comprises a one-way channel which is arranged in the pump body, the one-way channel is arranged between the working cavity and the sealing cavity, and a one-way valve which enables gas to flow from the sealing cavity to the working cavity only is arranged in the one-way channel. This shaft seal structure of anticorrosive vacuum pump has the advantage that improves sealed effect, prevents the emulsification of vacuum pump lubricating fluid.

Description

Shaft seal structure of anticorrosive vacuum pump

Technical Field

The utility model belongs to the technical field of vacuum pumps, and relates to a shaft seal structure of an anti-corrosion vacuum pump.

Background

The shaft seal structure on the vacuum pump is usually in a mode of adopting a framework oil seal or a mechanical oil seal, but in the two modes, some media leak into the bearing cavity through the shaft seal in use, so that lubricating liquid in the bearing cavity is emulsified, and the failure of transmission parts such as a bearing, a gear and the like is caused.

In view of the above problems, various improvements have been made, and some patents have also been applied, for example, chinese patent literature discloses a composite shaft seal structure of a screw vacuum pump [ application number: 201520330122.7; authorization notice number: CN204692119U ], which includes a pump body, an end cover, a side cover, a rotating shaft, a sealing device and a bearing assembly; one side of the side cover is fixedly connected with the end cover, and the other side of the side cover is fixedly connected with the pump body; a bearing cavity is formed in the end cover, and a gas seal cavity is formed in the side cover; two ends of the rotating shaft are respectively positioned in the bearing cavity and the gas sealing cavity; the bearing assembly is matched with the rotating shaft; the sealing device is arranged in the side cover and is matched with the gas sealing cavity; the end part of the rotating shaft is provided with a spiral sleeve, one end of the spiral sleeve is communicated with the gas sealing cavity, and the other end of the spiral sleeve is communicated with the vacuum working cavity in the pump body.

According to the shaft seal structure with the structure, nitrogen is input into the seal cavity through the sealing device, so that the nitrogen enters the vacuum working cavity through the spiral sleeve, the effect of air seal is achieved, and media in the vacuum working cavity are further prevented from entering the bearing cavity. However, the medium in the vacuum working chamber has the problem of unstable air pressure in the working process, the problem that the air pressure of the medium is suddenly higher than that of nitrogen, and the problem that the medium enters the bearing chamber through the shaft seal structure still exists, so that the lubricating liquid is emulsified.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a shaft seal structure of an anti-corrosion vacuum pump aiming at the problems in the prior art, and solves the technical problem of how to improve the sealing effect and prevent the emulsification of lubricating liquid of the vacuum pump.

The purpose of the utility model can be realized by the following technical scheme: the shaft seal structure of the anticorrosive vacuum pump is characterized in that the shaft seal structure comprises a one-way channel positioned in the pump body, the one-way channel is positioned between the working cavity and the sealing cavity, and a one-way valve which enables gas to flow from the sealing cavity to the working cavity only is arranged in the one-way channel.

And nitrogen is injected into the sealing cavity and flows to the working cavity through the one-way valve and the one-way channel to achieve the effect of air sealing. Even if the pressure of medium increases suddenly in the working chamber, because the check valve makes gas can only follow sealed chamber flow direction working chamber, consequently, when the medium pressure in the working chamber is greater than the nitrogen pressure in the sealed chamber, the check valve is closed, and the medium in the working chamber can not flow to sealed chamber through the one-way channel, further improves sealed effect to reduce the possibility that the medium flows to lubricated liquid, prevent the emulsification of vacuum pump lubricated liquid.

In the shaft seal structure of the anti-corrosion vacuum pump, a rotating shaft penetrates through the pump body, a labyrinth sealing plate is further arranged in the pump body, the labyrinth sealing plate is sleeved outside the rotating shaft and is fixed with the pump body, the labyrinth sealing plate is located between the one-way channel and the working cavity, and the one-way channel is communicated with the working cavity through a gap between the labyrinth sealing plate and the pump body. The labyrinth seal board set up the distance between extension one-way passageway and the working chamber, make the medium difficult for entering into sealed chamber, improve sealed effect.

In the shaft seal structure of the anti-corrosion vacuum pump, the pump body is further provided with a sealing element, the sealing element is sleeved outside the rotating shaft, and the sealing element is positioned between the labyrinth sealing plate and the sealing cavity. The sealing member can be rubber seal, oil blanket or mechanical seal, and the setting of sealing member improves sealed effect, and the sealing member is located between labyrinth seal board and the seal chamber simultaneously, and the nitrogen gas of pouring into in the seal chamber is towards the working chamber to the pressure that the sealing member produced, further improves airtight, prevents that the medium in the working chamber from entering into the seal chamber, reduces the probability that lubricating oil was emulsified.

In the shaft seal structure of the anti-corrosion vacuum pump, the pump body is further provided with filter cotton, the filter cotton is sleeved outside the rotating shaft, and the filter cotton is located between the labyrinth sealing plate and the sealing piece. The setting of filter pulp plays sealed filterable effect, and the setting of filter pulp improves sealed effect.

In the shaft seal structure of the anti-corrosion vacuum pump, the number of the one-way channels is 2-6, the one-way channels are uniformly arranged by taking the rotating shaft as the center, and the one-way valve is arranged in each one-way channel. The pressure of each part in the sealing cavity is uniform, better air sealing is realized, and better sealing effect is realized.

In the shaft seal structure of the anticorrosive vacuum pump, the pump body is also provided with a sewage discharge channel penetrating through the bottom of the pump body, the top of the sewage discharge channel is communicated with the bottom of the seal cavity, and the bottom of the sewage discharge channel is detachably, hermetically and fixedly connected through a plug. The structure can discharge the impurities in the sealed cavity.

Compared with the prior art, the shaft seal structure of the anticorrosive vacuum pump provided by the utility model has the following advantages:

1. this bearing seal structure is through setting up the check valve, even the medium in the messenger working chamber sudden pressure increase also can not flow into sealed chamber through one-way channel, further improves sealed effect to reduce the possibility of medium flow direction lubricated liquid, prevent the emulsification of vacuum pump lubricated liquid.

2. The shaft seal structure has the advantages that the one-way valve is arranged, so that the working cavity and the sealing cavity are positioned at two ends of the shaft seal structure, the pressure of nitrogen injected into the sealing cavity on the sealing element faces the working cavity, and the air seal is further improved.

Drawings

Fig. 1 is a schematic view of the structure of the present corrosion-resistant vacuum pump.

Fig. 2 is an overall structural schematic diagram of the shaft seal structure of the present anticorrosive vacuum pump.

In the figure, 1, a pump body; 2. a working chamber; 3. sealing the cavity; 4. a one-way channel; 5. a one-way valve; 6. a rotating shaft; 7. a labyrinth sealing plate; 8. a seal member; 9. filtering cotton; 10. a trapway; 11. and (7) a plug.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the anti-corrosion vacuum pump comprises a pump body 1 and a shaft seal structure, wherein the shaft seal structure comprises a one-way valve 5, a labyrinth seal plate 7, a seal 8 and filter cotton 9.

The pump body 1 is internally provided with a working cavity 2, a sealing cavity 3 and a one-way channel 4, the one-way channel 4 is positioned between the working cavity 2 and the sealing cavity 3, the one-way valve 5 is arranged in the one-way channel 4, and the one-way valve 5 enables gas to flow to the working cavity 2 only from the sealing cavity 3.

Wear to be equipped with pivot 6 in the pump body 1, labyrinth seal board 7, sealing member 8 and filter pulp 9 all set up in the pump body 1 and all overlap outside pivot 6, labyrinth seal board 7 is fixed mutually with the pump body 1, labyrinth seal board 7 is located between one-way channel 4 and the working chamber 2, one-way channel 4 is linked together with the working chamber 2 through the gap between labyrinth seal board 7 and the pump body 1, sealing member 8 is located between labyrinth seal board 7 and the sealed chamber 3, filter pulp 9 is located between labyrinth seal board 7 and the sealing member 8.

In this embodiment, the number of the one-way passages 4 is three, the one-way passages 4 are uniformly arranged with the rotating shaft 6 as the center, each one-way passage 4 is provided with the one-way valve 5, and in actual production, the number of the one-way passages 4 may be two or six.

The pump body 1 is also internally provided with a sewage channel 10 penetrating through the bottom of the pump body 1, the top of the sewage channel 10 is communicated with the bottom of the sealing cavity 3, and the bottom of the sewage channel 10 is detachably and hermetically fixedly connected through a plug 11.

During operation, nitrogen is injected into the sealing cavity 3, the nitrogen flows to the working cavity 2 through the one-way valve 5, the one-way channel 4, the labyrinth sealing plate 7 and the gap between the pump body 1, the effect of air sealing is achieved, and when the pressure of a medium in the working cavity 2 is suddenly increased, the one-way valve 5 is closed.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Although the terms pump body 1, working chamber 2, seal chamber 3, one-way passage 4, one-way valve 5, rotating shaft 6, labyrinth seal 7, seal 8, filter cotton 9, trapway 10, bulkhead 11, etc. are used more extensively herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to the spirit of the present invention.

Claims

1. The utility model provides a shaft seal structure of anticorrosive vacuum pump, vacuum pump include the pump body (1), have working chamber (2) and sealed chamber (3) in the pump body (1), characterized in that, shaft seal structure including be located one-way channel (4) in the pump body (1), one-way channel (4) are located between working chamber (2) and sealed chamber (3), be equipped with in one-way channel (4) and make gas only can flow to working chamber (2) from sealed chamber (3) check valve (5).

2. The shaft seal structure of an anticorrosive vacuum pump according to claim 1, characterized in that a rotating shaft (6) penetrates through the pump body (1), a labyrinth seal plate (7) is further arranged in the pump body (1), the labyrinth seal plate (7) is sleeved outside the rotating shaft (6) and the labyrinth seal plate (7) is fixed to the pump body (1), the labyrinth seal plate (7) is located between the one-way passage (4) and the working chamber (2), and the one-way passage (4) is communicated with the working chamber (2) through a gap between the labyrinth seal plate (7) and the pump body (1).

3. The shaft seal structure of an anti-corrosion vacuum pump according to claim 2, wherein a sealing element (8) is further disposed in the pump body (1), the sealing element (8) is sleeved outside the rotating shaft (6), and the sealing element (8) is located between the labyrinth sealing plate (7) and the sealing cavity (3).

4. The shaft seal structure of an anti-corrosion vacuum pump according to claim 3, wherein a filter cotton (9) is further disposed in the pump body (1), the filter cotton (9) is sleeved outside the rotating shaft (6), and the filter cotton (9) is located between the labyrinth sealing plate (7) and the sealing member (8).

5. The shaft seal structure of an anti-corrosion vacuum pump according to claim 1, 2, 3 or 4, wherein the number of the one-way passages (4) is 2-6, the one-way passages (4) are uniformly arranged by taking a rotating shaft (6) as a center, and the one-way valve (5) is arranged in each one-way passage (4).

6. The shaft seal structure of an anti-corrosion vacuum pump according to claim 1, 2, 3 or 4, wherein the pump body (1) further has a drainage channel (10) penetrating the bottom of the pump body (1), the top of the drainage channel (10) is communicated with the bottom of the sealed cavity (3), and the bottom of the drainage channel (10) is detachably and sealingly fixed by a plug (11).