Exhaust structure of screw vacuum pump

Abstract

The utility model belongs to the technical field of screw vacuum pumps, and relates to an exhaust structure of a screw vacuum pump, which comprises an air inlet cavity, a compression cavity and an exhaust cavity which are arranged in a pump body, a scavenging through hole and an exhaust through hole which are communicated with the compression cavity are arranged in the pump body, and a scavenging assembly is arranged above the scavenging through hole. An exhaust assembly is arranged above the exhaust through hole, the scavenging assembly comprises an adapter seat connected with an air source and a connecting pipe connected with the adapter seat and the pump body, an inner cavity of the adapter seat, an inner hole of the connecting pipe and the scavenging through hole form a scavenging channel, and the exhaust assembly comprises a one-way valve composed of a valve seat and a valve ball. A direct exhaust through hole communicated with the valve cavity and the exhaust cavity is formed in one side of the valve seat, and after the valve ball is driven by pressure to open the one-way valve, the exhaust through hole, the valve cavity and the direct exhaust through hole form an exhaust channel. The exhaust structure of the screw vacuum pump, provided by the utility model, has a better pollution discharge effect.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw vacuum pumps and relates to an exhaust structure of a screw vacuum pump. Background Art

[0002] The screw vacuum pump is an exhaust device that uses a pair of screws to rotate synchronously at high speed in opposite directions in the pump body to produce suction and exhaust. The screw vacuum pump includes a pump body and a motor, and the motor drives the active screw in the pair of screws. Screw vacuum pumps are widely used in industries such as metallurgy, chemical industry, food, and electronic coating. Therefore, the gases extracted by the screw vacuum pump are very complex. During use, pollutants such as gaseous steam or different liquids will be generated. These pollutants have a high corrosive effect on the components of the vacuum pump. If these pollutants are retained in the system during multiple working cycles, they will cause significant damage to components such as screws, pump bodies or pipeline structures. Moreover, these pollutants reduce the quality of the sealing lubricant or even dissolve it, thereby affecting the efficiency of the pump components.

[0003] Therefore, it is necessary to set up a device to remove these pollutants on the screw vacuum pump. Existing screw vacuum pumps generally use a gas ballast valve, which puts a certain amount of air in the compression process to increase the pressure of the mixed gas, so that most of the steam will not condense and be discharged from the pump together with the mixed gas. However, this structure is not effective in removing pollutants. Utility Model Content

[0004] The utility model aims at the deficiencies of the prior art and provides an exhaust structure of a screw vacuum pump, which has a better sewage discharge effect.

[0005] In order to solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions:

[0006] A screw vacuum pump exhaust structure comprises an air intake chamber, a compression chamber and an exhaust chamber arranged in a pump body, a scavenging through hole and an exhaust through hole connected to the compression chamber are arranged in the pump body, a scavenging assembly is arranged above the scavenging through hole, and an exhaust assembly is arranged above the exhaust through hole, the scavenging assembly comprises an adapter seat connected to an air source, a connecting pipe connecting the adapter seat and the pump body, the inner cavity of the adapter seat, the inner hole of the connecting pipe and the scavenging through hole form a scavenging channel, the exhaust assembly comprises a one-way valve composed of a valve seat and a valve ball, the valve ball is slidably arranged in the valve seat and switches the connection state between the valve cavity and the exhaust through hole, a straight discharge through hole connecting the valve cavity and the exhaust cavity is arranged on one side of the valve seat, after the valve ball is driven by pressure to open the one-way valve, the exhaust through hole, the valve cavity and the straight discharge through hole form an exhaust channel.

[0007] In the above-mentioned exhaust structure of a screw vacuum pump, a conical sealing surface is provided at the bottom of the valve seat, and the valve ball is driven by a spring to be pressed against the sealing surface to form a sealing structure. When the pump chamber pressure is greater than the driving force of the spring, the valve ball leaves the sealing surface and opens the one-way valve.

[0008] In the above-mentioned exhaust structure of a screw vacuum pump, a mounting seat is provided on the upper surface of the pump body, and a scavenging assembly mounting cavity and an exhaust assembly mounting cavity are provided in the mounting seat, which are respectively matched with the scavenging assembly and the exhaust assembly, and the scavenging assembly and the exhaust assembly are arranged adjacent to each other, the scavenging assembly is located on the side close to the air inlet cavity, and the exhaust assembly is located on the side close to the exhaust cavity. Preferably, the mounting seat is integrally formed on the pump body, and the mounting seat extends upward beyond the plane of the pump body.

[0009] In the above-mentioned exhaust structure of a screw vacuum pump, a scavenging plug is detachably connected to the adapter seat, and a valve cover is detachably connected to the valve seat.

[0010] In the above-mentioned exhaust structure of a screw vacuum pump, the mounting seat is provided with a limiting step that cooperates with the valve seat and a limiting step that cooperates with the connecting pipe. Sealing rings are provided between the bottom and outer wall of the valve seat and the mounting seat. Sealing rings are provided between the outer wall of the connecting pipe and the mounting seat and between the connecting pipe and the adapter seat. A sealing ring is provided between the outer wall of the adapter seat and the mounting seat.

[0011] In the above-mentioned exhaust structure of a screw vacuum pump, two exhaust through holes are provided, and two valve cavities corresponding to the exhaust through holes are provided in the valve seat, the two valve cavities are interconnected and are respectively equipped with a valve ball.

[0012] In the above-mentioned exhaust structure of a screw vacuum pump, the scavenging component installation cavity in the mounting seat is connected with the exhaust component installation cavity through a connecting groove.

[0013] In the above-mentioned exhaust structure of a screw vacuum pump, the scavenging through holes and the exhaust through holes are arranged in the radial direction; further, the exhaust ends of the straight through holes are arranged in the axial direction.

[0014] In the above-mentioned exhaust structure of a screw vacuum pump, a front scavenging air mounting hole connected to the exhaust chamber is provided at the front end of the pump body, a front scavenging air mounting hole is provided in the front scavenging air one-way valve, and a front scavenging air connector connected to the air source is provided on the front scavenging air one-way valve; preferably, the front scavenging air mounting hole is provided on the front end cover of the pump body.

[0015] In the above-mentioned exhaust structure of a screw vacuum pump, the rear end of the pump body is provided with a rear scavenging mounting hole connected to the air inlet chamber, a rear scavenging one-way valve is provided in the rear scavenging mounting hole, and a rear scavenging connector connected to the air source is provided on the rear scavenging one-way valve; preferably, the rear scavenging mounting hole is provided on the rear end cover of the pump body.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model provides an exhaust structure of a screw vacuum pump, which is provided with a scavenging assembly directly connected to the gas source, and can directly introduce gas into the inner cavity of the screw vacuum pump to purge it and discharge pollutants. At the same time, because the space of the compression chamber is limited, the pressure of the pump chamber will rise sharply after the gas is introduced. The utility model is provided with an exhaust assembly. When the pump chamber pressure is too high during purging, the gas in the compression chamber can be directly discharged into the exhaust chamber by the exhaust assembly. Compared with the existing gas ballast structure, the utility model has a better sewage discharge effect.

[0018] 2. The exhaust assembly provided by the utility model can also be directly connected to the exhaust chamber through the exhaust assembly when the screw vacuum pump is working, if the pressure in the compression chamber is too high, to play a role in pressure regulation, so as to protect the screw vacuum pump and enable it to work normally.

[0019] 3. The utility model further provides a front scavenging assembly and a rear scavenging assembly, which can respectively scavenge the exhaust chamber and the intake chamber of the screw vacuum pump to discharge pollutants in the exhaust chamber and the intake chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of the utility model;

[0021] Figure 2 It is a cross-sectional view of the utility model;

[0022] Figure 3 yes Figure 2 A partial enlarged view of

[0023] Reference numerals: 1, pump body; 11, air inlet chamber; 12, compression chamber; 13, exhaust chamber; 14, scavenging through hole; 15, exhaust through hole; 16, straight discharge through hole; 17, mounting seat; 18, connecting through groove;

[0024] 2. Scavenging assembly; 21. Adapter; 22. Connecting pipe; 23. Scavenging plug;

[0025] 3. Exhaust assembly; 31. Valve seat; 32. Valve ball; 33. Valve cavity; 34. Valve cover;

[0026] 4. Front scavenging air check valve; 41. Front scavenging air connection. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the accompanying drawings. Figure 1-3 :

[0028] An exhaust structure of a screw vacuum pump, comprising an air intake chamber 11, a compression chamber 12 and an exhaust chamber 13 arranged in a pump body 1, a scavenging through hole 14 and an exhaust through hole 15 connected to the compression chamber 12 are arranged in the pump body 1, a scavenging assembly 2 is arranged above the scavenging through hole 14, and an exhaust assembly 3 is arranged above the exhaust through hole 15, the scavenging assembly 2 comprises an adapter seat 21 connected to an air source, a connecting pipe 22 connecting the adapter seat 21 and the pump body 1, the inner cavity of the adapter seat 21, the connecting pipe 22 connecting the adapter seat 21 and the pump body 1, and the inner cavity of the adapter seat 21 and the connecting pipe 22 are connected to the pump body 1. The inner hole of the connecting pipe 22 and the scavenging through hole 14 form a scavenging passage. The exhaust component 3 includes a one-way valve composed of a valve seat 31 and a valve ball 32. The valve ball 32 is slidably arranged in the valve seat 31 and switches the connection state between the valve cavity 33 and the exhaust through hole 15. A straight-discharge through hole 16 connecting the valve cavity 33 and the exhaust cavity 13 is arranged on one side of the valve seat 31. After the valve ball 32 is driven by pressure to open the one-way valve, the exhaust through hole 15, the valve cavity 33 and the straight-discharge through hole 16 form an exhaust passage.

[0029] In this embodiment, when it is necessary to discharge the pollutants in the cavity, the gas source is connected to the adapter 21, and the gas enters the compression chamber 12 of the screw vacuum pump through the scavenging channel formed by the inner cavity of the adapter 21, the inner hole of the connecting pipe 22 and the scavenging hole 14, and the cavity is scavenged to remove the pollutants. The screw of the vacuum pump rotates to transport the gas together with the pollutants to the exhaust chamber 13 for discharge. When the pressure in the compression chamber 12 is greater than the set value of the exhaust component 3, the valve ball 32 is driven by the pressure to move upward to open the one-way valve. The gas in the compression chamber 12 can be directly transported to the exhaust chamber 13 for discharge through the exhaust channel formed by the exhaust hole 15, the valve chamber 33 and the straight discharge hole 16 without being transported by the screw. When the pressure drops, the valve ball 32 is reset, the one-way valve is closed, and the gas is still transported by the screw.

[0030] In this embodiment, the specific structure of the exhaust component 3 is: a conical sealing surface is provided at the bottom of the valve seat 31, and the valve ball 32 is driven by a spring to be pressed against the sealing surface to form a sealing structure. When the pump chamber pressure is greater than the driving force of the spring, the valve ball 32 leaves the sealing surface and opens the one-way valve.

[0031] The mounting structure of the scavenging assembly 2 and the exhaust assembly 3 in this embodiment is as follows: a mounting seat 17 is provided on the upper surface of the pump body 1, and a scavenging assembly mounting cavity and an exhaust assembly mounting cavity are provided in the mounting seat 17, which are respectively matched with the scavenging assembly 2 and the exhaust assembly 3, and the scavenging assembly 2 and the exhaust assembly 3 are arranged adjacent to each other, the scavenging assembly 2 is located on the side close to the air inlet cavity 11, and the exhaust assembly 3 is located on the side close to the exhaust cavity 13. Preferably, the mounting seat 17 is integrally formed on the pump body 1, and the mounting seat 17 extends upward beyond the plane of the pump body 1, which is more conducive to installing components, protecting components and connecting gas sources.

[0032] The adapter 21 is detachably connected with a scavenging plug 23, and the valve seat 31 is detachably connected with a valve cover 34. When scavenging is required, the scavenging plug 23 is first removed, and then the gas source is connected; when the exhaust assembly 3 needs to be disassembled or repaired, the valve cover 34 can be removed.

[0033] In order to enhance the sealing performance of each component, the mounting seat 17 is provided with a limiting step that cooperates with the valve seat 31 and a limiting step that cooperates with the connecting pipe 22. Sealing rings are provided between the bottom and outer wall of the valve seat 31 and the mounting seat 17. Sealing rings are provided between the outer wall of the connecting pipe 22 and the mounting seat 17 and between the connecting pipe 22 and the adapter seat 21. A sealing ring is provided between the outer wall of the adapter seat 21 and the mounting seat 17.

[0034] In order to enhance the exhaust capacity, two exhaust through holes 15 are provided, and two valve cavities 33 corresponding to the exhaust through holes 15 are provided in the valve seat 31 . The two valve cavities 33 are interconnected and are respectively equipped with a valve ball 32 .

[0035] The scavenging assembly installation cavity in the above-mentioned mounting seat 17 is connected with the exhaust assembly installation cavity through the connecting groove 18, and the scavenging assembly installation cavity and the exhaust assembly installation cavity form a connecting cavity, which is more conducive to processing and installation.

[0036] Preferably, the scavenging through holes 14 and the exhaust through holes 15 are arranged in the radial direction; preferably, the exhaust ends of the straight through holes 16 are arranged in the axial direction.

[0037] This embodiment further provides a scavenging structure of the air intake chamber 11 and the exhaust chamber 13:

[0038] The front end of the pump body 1 is provided with a front scavenging mounting hole connected to the exhaust chamber 13, and a front scavenging non-return valve 4 is provided in the front scavenging mounting hole, and a front scavenging connector 41 connected to the air source is provided on the front scavenging non-return valve 4; preferably, the front scavenging mounting hole is provided on the front end cover of the pump body 1, and when it is necessary to scaveng the exhaust chamber 13 to discharge pollutants in the exhaust chamber 13, the air source is connected to the front scavenging connector 41, and the pressure of the air source is used to open the front scavenging non-return valve 4, and the gas enters the exhaust chamber 13 for scavenging. After the scavenging is completed, the air source is closed, and the front scavenging non-return valve 4 is automatically reset.

[0039] In the above-mentioned exhaust structure of a screw vacuum pump, a rear end of the pump body 1 is provided with a rear scavenging mounting hole connected to the air inlet chamber 11, a rear scavenging one-way valve is provided in the rear scavenging mounting hole, and a rear scavenging connector connected to the air source is provided on the rear scavenging one-way valve (the structure of the rear scavenging one-way valve and the rear scavenging connector is the same as the structure of the front scavenging one-way valve 4 and the front scavenging connector 41, which is not drawn in the accompanying drawings); preferably, the rear scavenging mounting hole is provided on the rear end cover of the pump body 1, and when the air inlet chamber 11 needs to be scavenged to discharge pollutants in the air inlet chamber 11, the air source is connected to the rear scavenging connector, and the pressure of the air source is used to open the rear scavenging one-way valve, and the gas enters the air inlet chamber 11 for scavenging. After the scavenging is completed, the air source is closed and the rear scavenging one-way valve is automatically reset.

[0040] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An exhaust structure of a screw vacuum pump, comprising an air intake chamber (11), a compression chamber (12) and an exhaust chamber (13) arranged in a pump body (1), characterized in that: A scavenging through hole (14) and an exhaust through hole (15) communicating with the compression chamber (12) are arranged in the pump body (1); a scavenging assembly (2) is arranged above the scavenging through hole (14); an exhaust assembly (3) is arranged above the exhaust through hole (15); the scavenging assembly (2) comprises an adapter seat (21) connected to an air source, and a connecting pipe (22) connecting the adapter seat (21) and the pump body (1); the inner cavity of the adapter seat (21), the inner hole of the connecting pipe (22) and the scavenging through hole (14) form a scavenging passage The exhaust component (3) includes a one-way valve composed of a valve seat (31) and a valve ball (32); the valve ball (32) is slidably arranged in the valve seat (31) and switches the connection state between the valve cavity (33) and the exhaust through hole (15); a straight through hole (16) connecting the valve cavity (33) and the exhaust cavity (13) is arranged on one side of the valve seat (31); after the valve ball (32) is driven by pressure to open the one-way valve, the exhaust through hole (15), the valve cavity (33) and the straight through hole (16) form an exhaust channel.

2. The exhaust structure of a screw vacuum pump according to claim 1, characterized in that: The upper surface of the pump body (1) is provided with a mounting seat (17), and a scavenging assembly mounting cavity and an exhaust assembly mounting cavity are provided in the mounting seat (17) and are respectively matched with the scavenging assembly (2) and the exhaust assembly (3). The scavenging assembly (2) and the exhaust assembly (3) are arranged adjacent to each other, with the scavenging assembly (2) being located on a side close to the air inlet cavity (11) and the exhaust assembly (3) being located on a side close to the exhaust cavity (13).

3. The exhaust structure of a screw vacuum pump according to claim 1, characterized in that: The adapter seat (21) is detachably connected to a scavenging plug (23), and the valve seat (31) is detachably connected to a valve cover (34).

4. The exhaust structure of a screw vacuum pump according to claim 2, characterized in that: The mounting seat (17) is provided with a limiting step that cooperates with the valve seat (31) and a limiting step that cooperates with the connecting pipe (22). A sealing ring is provided between the bottom and outer wall of the valve seat (31) and the mounting seat (17). A sealing ring is provided between the outer wall of the connecting pipe (22) and the mounting seat (17) and between the connecting pipe (22) and the adapter seat (21). A sealing ring is provided between the outer wall of the adapter seat (21) and the mounting seat (17).

5. The exhaust structure of a screw vacuum pump according to claim 1, characterized in that: Two exhaust through holes (15) are provided, and two valve cavities (33) corresponding to the exhaust through holes (15) are provided in the valve seat (31). The two valve cavities (33) are interconnected and are respectively equipped with a valve ball (32).

6. The exhaust structure of a screw vacuum pump according to claim 2, characterized in that: The scavenging component installation cavity and the exhaust component installation cavity in the installation seat (17) are connected via a connecting groove (18).

7. The exhaust structure of a screw vacuum pump according to claim 1, characterized in that: The scavenging through holes (14) and the exhaust through holes (15) are arranged in the radial direction.

8. The exhaust structure of a screw vacuum pump according to claim 1, characterized in that: The front end of the pump body (1) is provided with a front scavenging installation hole connected to the exhaust chamber (13), a front scavenging check valve (4) is provided in the front scavenging installation hole, and a front scavenging connector (41) connected to an air source is provided on the front scavenging check valve (4).

9. The exhaust structure of a screw vacuum pump according to claim 1, characterized in that: The rear end of the pump body (1) is provided with a rear scavenging installation hole connected to the air inlet chamber (11), a rear scavenging one-way valve is provided in the rear scavenging installation hole, and a rear scavenging connector connected to an air source is provided on the rear scavenging one-way valve.

Images