CN213870282U - Air inlet valve of vacuum pump - Google Patents
Air inlet valve of vacuum pump Download PDFInfo
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- CN213870282U CN213870282U CN202021792393.1U CN202021792393U CN213870282U CN 213870282 U CN213870282 U CN 213870282U CN 202021792393 U CN202021792393 U CN 202021792393U CN 213870282 U CN213870282 U CN 213870282U
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Abstract
The utility model discloses an air inlet valve of a vacuum pump, which comprises a valve body, a valve cavity is arranged in the valve body, the two ends of the valve body are respectively provided with an air inlet and an air outlet which are communicated with the valve cavity, a valve plate which is matched with the air inlet in an opening and closing way is arranged in the valve cavity, a control chamber is arranged in the valve body, an end cover is arranged on an upper cover of the control chamber, a piston is matched with the inner side wall of the control chamber in a sliding and sealing manner, the piston is connected with a connecting rod which passes through the end cover and is connected with the valve plate, the piston divides the inner cavity of the control chamber into an upper cavity and a lower cavity, the side wall of the valve body is provided with a first through hole and a second through hole which are respectively communicated with the upper cavity and the lower cavity, the valve plate is provided with a valve cavity, a lower cavity is arranged in the valve cavity, a third through hole communicated with the valve cavity and the lower cavity is formed in the bottom of the control chamber, a spring is arranged in the lower cavity in an abutting mode, and the spring always tends to push the valve plate to the air inlet. The utility model discloses possess simple structure compactness, with low costs, the leakproofness good and the sensitive advantage of reaction.
Description
Technical Field
The utility model relates to a vacuum pump technical field, in particular to vacuum pump admission valve.
Background
The vacuum pump is a common mechanical structure, and an air inlet valve is required to be arranged at an air suction end of the vacuum pump in the using process so as to control and adjust the air inflow of the vacuum during the operation of the vacuum pump. Currently, for example, chinese patent application No. CN201821164942.3 discloses an air intake valve structure of a vacuum pump with oil screw, which includes a housing with a connecting flange, a sealing cover, and an internal valve block, wherein the surface of the sealing cover is provided with an air vent a, the housing is internally provided with a partition plate, and the middle and bottom surfaces are respectively provided with air vents b and c located at two sides of the valve block; a group of mechanisms for controlling the valve block to open or close through pneumatic control are arranged in the shell, and the valve block can be controlled to open or close through a large pressure difference. In the actual use process, the problems of complex structure, troublesome manufacture, higher cost, poor sealing property, slow reaction, slow opening action and the like exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's defect and not enough, provide a vacuum pump admission valve, possess simple structure compactness, with low costs, the leakproofness is good and the sensitive advantage of reaction.
The utility model provides a technical scheme that its technical problem adopted is: a vacuum pump air inlet valve comprises a valve body, a valve cavity is arranged in the valve body, an air inlet and an air outlet which are communicated with the valve cavity are respectively arranged at two ends of the valve body, a valve plate which is matched with the air inlet in an opening and closing way is arranged in the valve cavity, a control chamber is arranged in the valve body, the upper cover of the control chamber is provided with an end cover, the inner side wall of the control chamber is matched with a piston in a sliding and sealing way, the piston is connected with a connecting rod which passes through the end cover and is connected with the valve plate, the piston divides the inner cavity of the control chamber into an upper cavity and a lower cavity, the side wall of the valve body is provided with a first through hole and a second through hole which are respectively communicated with the upper cavity and the lower cavity, the valve plate is provided with a valve cavity, a lower cavity is arranged in the valve cavity, a third through hole communicated with the valve cavity and the lower cavity is formed in the bottom of the control chamber, a spring is arranged in the lower cavity in an abutting mode, and the spring always tends to push the valve plate to the air inlet.
Furthermore, the valve plate is fixed on the top end of the connecting rod through a nut, and a pressing plate is arranged between the nut and the valve plate, so that the valve plate is convenient to mount and firm in connection.
Furthermore, a sealing plate is embedded on the valve plate, the sealing plate is pressed by the pressing plate, and the sealing plate is in sealing fit with the air inlet, so that the sealing performance of the air inlet is improved.
Furthermore, the cross section of the pressing plate is arched, the edge of the pressing plate is abutted and matched with the sealing plate, so that the sealing plate is firmly connected, the phenomenon that a gap is generated due to loosening is avoided, and the sealing performance is improved.
Furthermore, the control chamber is integrated with the valve body through a connecting rib, and manufacturing is facilitated.
Furthermore, the end cover is provided with a guide belt which is in sliding fit with the connecting rod, so that the connecting rod can move stably.
Furthermore, an O-shaped ring is sleeved on the side wall of the piston, so that the sealing of the upper cavity and the lower cavity is ensured, the air leakage is avoided, and the piston moves stably.
Furthermore, the second through holes are two, so that the vacuum degree of the lower cavity can be conveniently controlled, the valve plate can quickly act, and the reaction is sensitive.
The utility model has the advantages that: the valve body is internally provided with the control chamber, the upper cover of the control chamber is provided with the end cover, the inner side wall of the control chamber is matched with the piston in a sliding and sealing manner, the piston is connected with the connecting rod, the connecting rod penetrates through the end cover and is connected with the valve plate, the inner cavity of the control chamber is divided into an upper cavity and a lower cavity by the piston, the side wall of the valve body is provided with a first through hole and a second through hole which are respectively communicated with the upper cavity and the lower cavity, the bottom of the control chamber is provided with a third through hole which is communicated with the valve cavity and the lower cavity, the lower cavity is internally provided with the spring in a supporting manner, and the spring always tends to push the valve plate to the air inlet. Under normal conditions, the valve plate fills gas into the lower cavity from the second through hole under the action of the spring and the piston, so that the valve plate seals the gas inlet, and the sealing performance is high; when the air inlet valve works, the first through hole is communicated with the atmosphere, the second through hole is closed, the air outlet extracts air, the air in the lower cavity is gradually and quickly extracted under the action of the third through hole, the lower cavity gradually reaches a set vacuum degree, the piston moves downwards and overcomes the spring, the valve plate correspondingly moves downwards, the air inlet is opened, the action is quick, the response is sensitive, and therefore the function of the air inlet valve is achieved, the structure is simple and compact, the manufacturing is relatively simple, and the cost is correspondingly reduced; generally, the utility model discloses possess simple structure compactness, with low costs, the leakproofness good and the sensitive advantage of reaction.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Shown in the figure: 1-a valve body; 1.1-valve cavity; 1.2-gas inlet; 1.3-gas outlet; 1.4-a first via; 1.5-a second via; 2-a valve plate; 3-a control room; 3.1-upper chamber; 3.2-lower cavity; 3.3-third via; 4-end cover; 5-a piston; 6-connecting rod; 7-a spring; 8-pressing a plate; 9-sealing plate; 10-a guide belt; 11-O-ring.
Detailed Description
For a more intuitive and complete understanding of the technical solution of the present invention, the following non-limiting characteristic description is now performed by combining the drawings of the present invention:
as shown in fig. 1, a vacuum pump intake valve comprises a valve body 1, a valve cavity 1.1 is arranged in the valve body 1, an air inlet 1.2 and an air outlet 1.3 which are communicated with the valve cavity 1.1 are respectively arranged at two ends of the valve body 1, a valve plate 2 which is matched with the air inlet 1.2 in an opening and closing manner is arranged in the valve cavity 1.1, a control chamber 3 is arranged in the valve body 1, an end cover 4 is arranged on an upper cover of the control chamber 3, a piston 5 is arranged on the inner side wall of the control chamber 3 in a sliding and sealing manner, a connecting rod 6 is connected to the piston 5 and penetrates through the end cover 4 and is connected with the valve plate 2, the inner cavity of the control chamber 3 is divided into an upper cavity 3.1 and a lower cavity 3.2 by the piston 5, a first through hole 1.4 and a second through hole 1.5 which are respectively communicated with the upper cavity 3.1 and the lower cavity 3.2 are arranged on the side wall of the valve body 1, a third through hole 3.3.3 which is communicated with the lower cavity 3.2 is arranged at the bottom of the control chamber, a spring 7 is abutted against the air inlet, and the spring 7 always tends to push the valve plate 2 to the valve cavity 1.2.
The valve plate 2 is fixed at the top end of the connecting rod 6 through a nut, and a pressure plate 8 is arranged between the nut and the valve plate 2; a sealing plate 9 is embedded on the valve plate 2, the pressing plate 8 presses the sealing plate 9, and the sealing plate 9 is in sealing fit with the air inlet 1.2; the cross section of the pressure plate 8 is arched, and the edge of the pressure plate 8 is propped against the sealing plate 9.
Specifically, the control chamber 3 is integrated with the valve body 1 through a connecting rib; the valve body 1 is formed by connecting an upper valve body and a lower valve body which are mutually covered, and a sealing ring is arranged between the upper valve body and the lower valve body and is fixedly connected with the upper valve body and the lower valve body through screws.
The end cover 4 is provided with a guide belt 10 which is in sliding fit with the connecting rod 6; specifically, the end cover 4 is further provided with a sealing ring matched with the connecting rod 6, the end cover 4 is fixed at an opening of the control chamber 3 through a screw, and the sealing ring is arranged between the end cover 4 and the control chamber 3, so that the sealing performance of the upper chamber 3.1 is guaranteed.
And a sealing ring is also arranged between the connecting rod 6 and the valve plate 2, so that when the valve plate 2 closes the air inlet 1.2, air can be prevented from flowing into a gap between parts, and the sealing property is improved.
An O-shaped ring 11 is sleeved on the side wall of the piston 5; specifically, the piston 5 is fixed at the lower end of the connecting rod 6 through a screw, and a sealing ring is sleeved between the screw and the connecting rod 6, so that the relative sealing performance of the upper cavity 3.1 and the lower cavity 3.2 is ensured, the air leakage is avoided, and the piston 5 moves stably.
The number of the second through holes 1.5 is two, and the two second through holes 1.5 are respectively connected with the inflation inlet and the exhaust outlet, so that the vacuum degree of the lower cavity 3.2 can be conveniently controlled.
The upper end of the valve body 1 is provided with a threaded connecting hole, so that equipment needing vacuumizing can be conveniently connected; the lower extreme of valve body 1 is equipped with the engaging lug, is convenient for with vacuum pump connection, and the bottom of valve body 1 is inlayed and is equipped with the sealing washer, guarantees the leakproofness.
The utility model discloses a concrete theory of operation as follows: under normal conditions, the valve plate 2 fills gas into the lower cavity 3.2 through the two second through holes 5 under the action of the spring 7 and the piston 5, so that the gas pressure of the lower cavity 3.2 is kept within a set value, and the valve plate 2 firmly seals the gas inlet 1.2; when the vacuum pump works, the first through hole 1.4 is communicated with the atmosphere, the two second through holes 1.5 are closed, the vacuum pump works to enable gas to be extracted from the gas outlet 1.3, the gas in the lower cavity 3.2 is gradually and rapidly extracted under the action of the third through hole 3.3, the lower cavity 3.2 gradually reaches a set vacuum degree, the piston 5 moves downwards and overcomes the elasticity of the spring 7, and the valve plate 2 correspondingly moves downwards to open the gas inlet 1.2; it is worth mentioning that the size of the third through hole 3.3 determines the opening speed of the valve plate 2, and the larger the aperture of the third through hole 3.3 is, the faster the opening speed is.
The above is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.
Claims (8)
1. The utility model provides a vacuum pump admission valve, includes valve body (1), be equipped with valve pocket (1.1) in valve body (1), the both ends of valve body (1) are equipped with the intercommunication respectively air inlet (1.2) and gas outlet (1.3) of valve pocket (1.1), be equipped with in valve pocket (1.1) with air inlet (1.2) open and close complex valve plate (2), its characterized in that: a control chamber (3) is arranged in the valve body (1), an end cover (4) is arranged on the upper cover of the control chamber (3), a piston (5) is matched with the inner side wall of the control chamber (3) in a sliding and sealing way, a connecting rod (6) is connected on the piston (5), the connecting rod (6) passes through the end cover (4) and is connected with the valve plate (2), the piston (5) divides the inner cavity of the control chamber (3) into an upper cavity (3.1) and a lower cavity (3.2), a first through hole (1.4) and a second through hole (1.5) which are respectively communicated with the upper cavity (3.1) and the lower cavity (3.2) are arranged on the side wall of the valve body (1), the bottom of the control chamber (3) is provided with a third through hole (3.3) communicating the valve cavity (1.1) and the lower cavity (3.2), the lower cavity (3.2) is internally provided with a spring (7) in a propping manner, and the spring (7) always tends to push the valve plate (2) to the air inlet (1.2).
2. A vacuum pump inlet valve as claimed in claim 1, wherein: the valve plate (2) is fixed on the top end of the connecting rod (6) through a nut, and a pressing plate (8) is arranged between the nut and the valve plate (2).
3. A vacuum pump inlet valve as claimed in claim 2, wherein: the valve plate (2) is embedded with a sealing plate (9), the sealing plate (9) is pressed by the pressing plate (8), and the sealing plate (9) is in sealing fit with the air inlet (1.2).
4. A vacuum pump inlet valve according to claim 3, wherein: the cross section of the pressing plate (8) is arched, and the edge of the pressing plate (8) is matched with the sealing plate (9) in an abutting mode.
5. A vacuum pump inlet valve as claimed in claim 1, wherein: the control chamber (3) is integrally arranged with the valve body (1) through a connecting rib.
6. A vacuum pump inlet valve as claimed in claim 1, wherein: and a guide belt (10) in sliding fit with the connecting rod (6) is arranged on the end cover (4).
7. A vacuum pump inlet valve as claimed in claim 1, wherein: and an O-shaped ring (11) is sleeved on the side wall of the piston (5).
8. A vacuum pump inlet valve as claimed in claim 1, wherein: the number of the second through holes (1.5) is two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021792393.1U CN213870282U (en) | 2020-08-25 | 2020-08-25 | Air inlet valve of vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021792393.1U CN213870282U (en) | 2020-08-25 | 2020-08-25 | Air inlet valve of vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213870282U true CN213870282U (en) | 2021-08-03 |
Family
ID=77047223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021792393.1U Active CN213870282U (en) | 2020-08-25 | 2020-08-25 | Air inlet valve of vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213870282U (en) |
-
2020
- 2020-08-25 CN CN202021792393.1U patent/CN213870282U/en active Active
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