CN217108321U - Pneumatic piston type vacuum isolation valve - Google Patents
Pneumatic piston type vacuum isolation valve Download PDFInfo
- Publication number
- CN217108321U CN217108321U CN202123419293.1U CN202123419293U CN217108321U CN 217108321 U CN217108321 U CN 217108321U CN 202123419293 U CN202123419293 U CN 202123419293U CN 217108321 U CN217108321 U CN 217108321U
- Authority
- CN
- China
- Prior art keywords
- valve
- shaft
- valve body
- pneumatic piston
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Details Of Valves (AREA)
Abstract
The pneumatic piston type vacuum isolation valve comprises a valve cover and a valve body, wherein a communicated valve cavity is formed in the valve cover and the valve body, the bottom of the valve body is of a plane structure, the valve cavity in the valve body is opened at the bottom of the valve body, a valve shaft is arranged in the valve cavity, the bottom of the valve shaft extends to the plane structure of the bottom, a pressing air pipe joint which can be communicated with the valve cavity is arranged on the valve cover, a releasing air pipe joint which can be communicated with the valve cavity is arranged on the valve body, a shaft body sealing structure is arranged on the contact surface of the valve shaft and the valve cavity, and a contact end face sealing structure is arranged on the plane structure of the bottom of the valve body. The utility model discloses the isolating valve of structure has reduced its influence of leaking to leakproofness test result itself greatly, can realize the leakproofness test to the higher product of being surveyed of test standard requirement.
Description
Technical Field
The utility model belongs to the technical field of leakproofness detection device technique and specifically relates to a pneumatic piston formula vacuum isolation valve is related to.
Background
The tightness test refers to testing the tightness of a sample to determine whether or not leakage occurs or to determine the degree of leakage, and has a wide application field, and can test almost all products with sealing requirements. The sealing performance detection device adopted in the field of sealing performance detection has very high sealing requirements on an isolation valve inside the device, the mainstream isolation valve in the market is generally a diaphragm valve, the diaphragm valve in the market at present is an isolation valve in a special form, and a starting and closing part of the diaphragm valve is a diaphragm made of soft materials, and the inner cavity of the valve body is separated from the inner cavity of the valve cover and a driving part by the diaphragm. The valve body of the diaphragm valve is made of cast iron, cast steel or cast stainless steel and is lined with various corrosion-resistant or abrasion-resistant materials, diaphragm material rubber and polytetrafluoroethylene. For a common process, the diaphragm valve can play a good isolating function and meet the use requirement. However, in the field of leak detection requiring high leak rate, the problem of insufficient sealing performance of the valve structure is revealed.
Certain leakage still exists when the diaphragm valve used in the prior art is closed, and the leakage rate is generally 1.0E-8 to 1.0E-10 Pam 3 The/s grade (the helium gas is taken as a medium, and the result is measured by using a helium detector), when the leakage rate of the isolation valve is close to the tightness test standard of the tested product, the test result is distorted or the test is directly failed; therefore, when the test standard is higher, the commonly used diaphragm valve in the prior art can not meet the requirement of the test result on the leakage rate of the valve body, and the diaphragm valve is directly selected for testing, so that the authenticity of the test structure can not be ensured.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a lower pneumatic piston vacuum isolation valve of leak rate.
The utility model provides a technical scheme that above-mentioned technical problem adopted does:
the pneumatic piston type vacuum isolation valve comprises a valve cover and a valve body, wherein a communicated valve cavity is formed in the valve cover and the valve body, the bottom of the valve body is of a plane structure, the valve cavity in the valve body is opened at the bottom of the valve body, a valve shaft is arranged in the valve cavity, the bottom of the valve shaft extends to the plane structure of the bottom, a pressing air pipe joint which can be communicated with the valve cavity is arranged on the valve cover, a releasing air pipe joint which can be communicated with the valve cavity is arranged on the valve body, a shaft body sealing structure is arranged on the contact surface of the valve shaft and the valve cavity, and a contact end face sealing structure is arranged on the plane structure of the bottom of the valve body.
Further, the outer wall of the valve shaft is in contact connection with the inner wall of the valve cavity.
Further, the cross section of the valve shaft along the central axis is T-shaped.
Further, the shaft body sealing structure comprises shaft sealing cavities respectively arranged at the upper part, the middle part and the lower part of the valve shaft, shaft sealing rings are arranged in the shaft sealing cavities, and the valve shaft is in sealing connection with the valve cavity through the shaft sealing rings.
Further, the contact end face sealing structure comprises a sealing cavity and an end face sealing ring, wherein the sealing cavity is arranged on the plane structure at the bottom of the valve body and faces the bottom, and the end face sealing ring is arranged in the sealing cavity.
Furthermore, the end face sealing ring is a butyronitrile sealing ring.
Furthermore, the valve cover is provided with uniformly distributed mounting holes, the valve body is provided with connecting holes corresponding to the mounting holes and having the same specification, and the mounting holes and the connecting holes are connected through mounting screws after corresponding to each other.
Further, when the valve cover and the valve body are in the installation state, the installation screws penetrate through the valve cover installation holes and the valve body connection holes and extend out of the plane end of the valve body, the extended installation screws can be connected with other structures, and the installation state is a state that the valve cover and the valve body are tightly combined through the installation screws.
Furthermore, after the installation of the mounting screws, the compression air pipe joint and the release air pipe joint are arranged in parallel from top to bottom, and the compression air pipe joint is arranged right above the release air pipe joint and is axially parallel to the release air pipe joint.
Compared with the prior art, the utility model discloses the advantage that possesses does:
the utility model discloses an isolation valve has reduced the leak rate of valve structure through special pneumatic piston structural design by a wide margin, through the experiment to the helium is the medium, uses the helium to examine the appearance and detects the leakage, surveys the utility model discloses an isolation valve leak rate only is about 5.0E-11 Pam 3 The isolating valve with the structure greatly reduces the influence of leakage on the tightness test result, and can realize the tested product with higher requirement on the test standardAnd (5) testing the sealing performance of the product.
Drawings
Fig. 1 is a schematic sectional structure of the present invention;
FIG. 2 is a schematic view of the disassembled structure of the present invention;
fig. 3 is a schematic view of the installation structure of the present invention.
In the figure, 1-valve body, 2-valve shaft, 3-valve cover, 4-compressed air pipe joint, 5-released air pipe joint, 6-upper shaft sealing ring, 7-middle shaft sealing ring, 8-lower shaft sealing ring, 9-end surface sealing ring, 10-mounting screw, 11-mounting hole, 12-connecting hole and 13-valve cavity.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1-3, the pneumatic piston type vacuum isolation valve includes a valve cover 3 and a valve body 1, the valve cover 3 and the valve body 1 are internally provided with a communicated valve cavity 13, the bottom of the valve body 1 is of a planar structure, the valve cavity 13 inside the valve body 1 is opened at the bottom of the valve body 1, a valve shaft 2 is arranged in the valve cavity 13, the bottom of the valve shaft 2 extends to the bottom of the planar structure, the valve cover 3 is provided with a compressed air pipe joint 4 which can be communicated with the valve cavity 13, the valve body 1 is provided with a released air pipe joint 5 which can be communicated with the valve cavity 13, the contact surface of the valve shaft 2 and the valve cavity 13 is provided with a shaft body sealing structure, and the bottom of the valve body 1 is provided with a contact end surface sealing structure.
Further, the outer wall of the valve shaft 2 is in contact connection with the inner wall of the valve cavity 13.
Further, the section of the valve shaft 2 along the central axis is T-shaped.
Further, the shaft body sealing structure comprises shaft sealing cavities respectively arranged at the upper part, the middle part and the lower part of the valve shaft 2, shaft sealing rings, namely an upper shaft sealing ring 6, a middle shaft sealing ring 7 and a lower shaft sealing ring 8 are respectively arranged in the shaft sealing cavities, the valve shaft 2 is in sealing connection with the valve cavity 13 through the shaft sealing rings, the shaft body sealing structure at least comprises an upper shaft body sealing structure, a middle shaft sealing structure and a lower shaft body sealing structure, and more than three shaft body sealing structures can be selectively arranged in other embodiments.
Further, the contact end face sealing structure comprises a sealing cavity which is arranged on the bottom plane structure of the valve body 1 and faces the bottom, and an end face sealing ring 9 arranged in the sealing cavity.
Further, the end face seal ring 9 is a nitrile seal ring.
Further, the valve cover 3 on set up evenly distributed's mounting hole 11, set up on the valve body 1 with mounting hole 11 correspond, with the connecting hole 12 of specification, the connection of valve cover 3 and valve body 1 is realized through installation screw 10 after mounting hole 11 and connecting hole 12 correspond.
Further, when the valve cap 3 and the valve body 1 are in the installation state, the installation screw 10 penetrates through the installation hole 11 of the valve cap 3 and the connection hole 12 of the valve body 1 and extends out of the plane end of the valve body 1, the installation screw 10 extends out to be connected with other structures, and the installation state is a state that the valve cap 3 and the valve body 1 are tightly combined through the installation screw 10.
Further, after the installation of the installation screw 10, the compressing air pipe joint 4 and the releasing air pipe joint 5 are arranged in parallel from top to bottom, and the compressing air pipe joint 4 is arranged right above the releasing air pipe joint 5 and is axially parallel to the compressing air pipe joint 4 and the releasing air pipe joint 5.
The utility model discloses a pneumatic piston formula vacuum isolation valve's theory of operation does: the isolating valve adopts a plane installation mode (namely, an inlet channel and an outlet channel are arranged on a smooth plane, the isolating valve is installed on the plane to control the conduction and the closing of the inlet channel and the outlet channel, one inlet channel and one outlet channel are arranged in a bottom shaft sealing ring and an end surface sealing ring 9 and are installed in a contact end surface of an isolating valve body 1), compressed air is connected to two opened/closed compressed air interfaces, namely a compressed air pipe joint 4 and a released air pipe joint 5, and the opening or the closing of the valve is controlled. When the valve is opened, the compressed air pushes the valve shaft 2 to retreat, and the inlet channel and the outlet channel are communicated; when the valve is closed, the compressed air pushes the valve shaft 2 to move forward, a butyronitrile material sealing ring, namely an end face sealing ring 9, is arranged between the plane of the lower part of the valve shaft 2 and the plane of the bottom of the valve cavity 13 to be isolated, and the pressure between the 2 planes enables the end face sealing ring 9 to be tightly attached to the surface of the cavity body, so that the tight isolation effect is achieved; namely, the valve shaft 2 is pneumatically controlled by a pressing air pipe joint 4 and a releasing air pipe joint 5, the pressing end presses the air pipe joint 4 to blow air, the valve shaft 2 advances to press a shaft sealing ring at the lower part to seal and separate an inlet/outlet channel, the releasing end releases the air pipe joint 5 to blow air, and the valve shaft 2 retreats to communicate the inlet/outlet channel.
And (3) testing the use performance:
the required tightness detection standard of the sample to be tested is 1.0E-8 Pam 3 Is/s, i.e.
Test results A<1.0E-8 Pam 3 The/s is the test pass;
test results A>1.0E-8 Pam 3 The test failed in/s.
In actual testing, test result a = product leak + isolation valve leak + system leak.
If the main flow isolating valve commonly used in the prior art is selected, the leakage rate is 1.0E-9 Pam 3 And/s, the effect of the isolation valve leakage alone on the test standard is (1.0E-9/1.0E-8) = 100% =10%, resulting in distorted test results.
Choose for use the utility model discloses a behind the pneumatic piston vacuum isolation valve, the isolation valve leaks to be (5.0E-11/1.0E-8) × 100% =0.5% to test standard's influence, and this influence can be ignored to the accuracy of test result has been guaranteed.
The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. Pneumatic piston formula vacuum isolation valve, including valve gap and valve body, its characterized in that: the valve comprises a valve cover and a valve body, wherein the valve cover and the valve body are internally provided with communicated valve cavities, the bottom of the valve body is of a planar structure, the valve cavities in the valve body are opened at the bottom of the valve body, a valve shaft is arranged in the valve cavities, the bottom of the valve shaft extends to the planar structure at the bottom, a compressed air pipe joint which can be communicated with the valve cavities is arranged on the valve cover, a released air pipe joint which can be communicated with the valve cavities is arranged on the valve body, a shaft body sealing structure is arranged on the contact surface of the valve shaft and the valve cavities, and a contact end face sealing structure is arranged at the planar structure at the bottom of the valve body.
2. A pneumatic piston vacuum isolation valve as defined in claim 1, wherein: the outer wall of the valve shaft is in contact connection with the inner wall of the valve cavity.
3. A pneumatic piston vacuum isolation valve as claimed in claim 1 or 2, wherein: the section of the valve shaft along the central axis is T-shaped.
4. A pneumatic piston vacuum isolation valve as defined in claim 1, wherein: the shaft body sealing structure comprises shaft sealing cavities which are respectively arranged at the upper part, the middle part and the lower part of the valve shaft, and shaft sealing rings are arranged in the shaft sealing cavities.
5. A pneumatic piston vacuum isolation valve as defined in claim 1, wherein: the contact end face sealing structure comprises a sealing cavity and an end face sealing ring, wherein the sealing cavity is arranged on the plane structure at the bottom of the valve body and faces the bottom, and the end face sealing ring is arranged in the sealing cavity.
6. A pneumatic piston vacuum isolation valve as claimed in claim 5, wherein: the end face sealing ring is a butyronitrile sealing ring.
7. A pneumatic piston vacuum isolation valve as defined in claim 1, wherein: the valve cover is provided with mounting holes which are uniformly distributed, the valve body is provided with connecting holes which correspond to the mounting holes and have the same specification, and the mounting holes and the connecting holes correspond to each other and then are connected through mounting screws.
8. A pneumatic piston vacuum isolation valve as defined in claim 7, wherein: and when the valve cover and the valve body are in the installation state, the installation screw penetrates through the valve cover installation hole and the valve body connection hole and extends out of the plane end of the valve body.
9. A pneumatic piston vacuum isolation valve as defined in claim 1, wherein: after the air pipe connector is installed through the installation screw, the compression air pipe connector and the release air pipe connector are arranged in parallel up and down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123419293.1U CN217108321U (en) | 2021-12-31 | 2021-12-31 | Pneumatic piston type vacuum isolation valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123419293.1U CN217108321U (en) | 2021-12-31 | 2021-12-31 | Pneumatic piston type vacuum isolation valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217108321U true CN217108321U (en) | 2022-08-02 |
Family
ID=82593129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123419293.1U Active CN217108321U (en) | 2021-12-31 | 2021-12-31 | Pneumatic piston type vacuum isolation valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217108321U (en) |
-
2021
- 2021-12-31 CN CN202123419293.1U patent/CN217108321U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110274735B (en) | Multistage-compression-ratio-adjustable static seal test experimental device | |
| CN106706220B (en) | Device for testing sealing performance of rubber O-shaped ring in high-pressure hydrogen environment | |
| CN217108321U (en) | Pneumatic piston type vacuum isolation valve | |
| CN108005993B (en) | Electrohydraulic actuator for gas flow regulating system of reciprocating compressor | |
| CN113187903A (en) | Anti-leakage valve device | |
| CN111043351B (en) | Ultralow-temperature low-flow-resistance self-maintaining two-position three-way stop valve | |
| CN205207735U (en) | Airtight blocking valve | |
| CN216309361U (en) | Airtightness detection device for power plant maintenance | |
| CN214952023U (en) | Air tightness detection device for circular air blowing cooling device | |
| CN112797221B (en) | Pilot axial flow type safety valve | |
| CN107727316A (en) | Fixing ball valve sealing property detection device | |
| CN205120319U (en) | Multi -functional valve test system of automobile -used LNG gas cylinder | |
| CN208793729U (en) | Pressure reducing valve with retaining connector | |
| CN219532382U (en) | Be applied to many times sealing test device | |
| CN103217260A (en) | Plastic valve pressure testing device | |
| CN216951848U (en) | Pipeline test liquid pressure conversion device | |
| CN103244694B (en) | Piston type zero leakage stop valve | |
| CN210571243U (en) | Air cylinder air tightness test device | |
| CN212779816U (en) | Automobile pipeline air tightness detection device | |
| CN212536674U (en) | High-sealing pneumatic valve actuator | |
| CN215374487U (en) | Under-voltage closing detection table | |
| CN217878179U (en) | Metering valve | |
| CN217381650U (en) | Double-sealing high-pressure stop valve | |
| CN103267166B (en) | Piston-type zero leakage gate valve | |
| CN221033451U (en) | Piston pressure cylinder test device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230413 Address after: Factory Building No. 8, No. 98 Lushan Road, High tech Zone, Suzhou City, Jiangsu Province, 215000 Patentee after: Suzhou Zhongke Ruilong Technology Co.,Ltd. Address before: Room 502, building B, No. 8, Xintai Road, Xinwu District, Wuxi City, Jiangsu Province, 214000 Patentee before: Sailicheng (Wuxi) Automation Technology Co.,Ltd. |