CN111075970A - Safety valve of vacuum system - Google Patents

Safety valve of vacuum system Download PDF

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Publication number
CN111075970A
CN111075970A CN201911373253.2A CN201911373253A CN111075970A CN 111075970 A CN111075970 A CN 111075970A CN 201911373253 A CN201911373253 A CN 201911373253A CN 111075970 A CN111075970 A CN 111075970A
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CN
China
Prior art keywords
filter screen
valve
valve core
vacuum system
air inlet
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Pending
Application number
CN201911373253.2A
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Chinese (zh)
Inventor
陈家富
冯寅兵
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Bwokai Technologies Co ltd
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Zhejiang Bwokai Technologies Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Zhejiang Bwokai Technologies Co ltd filed Critical Zhejiang Bwokai Technologies Co ltd
Priority to CN201911373253.2A priority Critical patent/CN111075970A/en
Publication of CN111075970A publication Critical patent/CN111075970A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/06—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with special arrangements for adjusting the opening pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/02—Flanged joints the flanges being connected by members tensioned axially
    • F16L23/032—Flanged joints the flanges being connected by members tensioned axially characterised by the shape or composition of the flanges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/16—Flanged joints characterised by the sealing means
    • F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
    • F16L23/22—Flanged joints characterised by the sealing means the sealing means being rings made exclusively of a material other than metal

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Details Of Valves (AREA)

Abstract

The invention relates to the field of valves, and discloses a vacuum system safety valve which comprises a valve seat (1) and a valve core (3), wherein the valve core (3) is movably arranged and controls the opening and closing of an installation valve, the valve seat (1) comprises an air inlet (11) and an air outlet (12), a filter screen (2) is installed at the air inlet (11) of the valve seat (1), and the filter screen (2) comprises at least one fine filter screen (21) and at least one coarse filter screen (22). According to the invention, the two stages of filter screen sheets are added at the air inlet, so that solid impurities in a vacuum system enter the safety valve along with air flow during positive pressure exhaust, and influence is generated on normal action of a pressure relief valve core of the safety valve; the interface is subjected to standardized series design, and adopts a standard vacuum KF interface to ensure the sealing performance and higher high temperature resistance; after the KF interface is adopted, the general purpose interface of the vacuum system is ensured.

Description

Safety valve of vacuum system
Technical Field
The invention relates to the technical field of valves, in particular to a safety valve of a vacuum system.
Background
With the increasingly deep application of vacuum technology in the fields of vacuum coating, nuclear fusion, low-temperature superconduction, aerospace and the like, the safety problem of the vacuum container is more and more important. When the internal pipeline of the vacuum container leaks, the gas release amount is increased or the vacuum container is inflated and pressurized, the pressure in the vacuum container is rapidly increased, and the vacuum container is easy to deform, crack or even explode. The safety valve used on the traditional pressure pipeline can not meet the use requirement that a part of vacuum containers need to be reliably opened under the condition of being close to the background pressure of the environment. In order to solve these problems, it is necessary to design and install a safety valve on the vacuum container, which can reliably open at a pressure close to the background pressure of the environment.
At present, a pressure sensor is generally adopted in a vacuum system to set the pressure of equipment and electrically control air release to ensure the safety of the equipment, but the method is unscientific, and the reason is that safety accidents can be caused once sudden power failure occurs.
Meanwhile, each vacuum system equipment manufacturer also adopts non-standard safety valves in equipment production, and the vacuum system equipment manufacturers have poor universality and certain design defects. Such as: harmful gas is discharged, the safety valve is easy to block due to no filter design, and the solidification of the interface can not be adjusted or replaced according to the actual working state.
The existence of above circumstances needs to promote a section in the market and be applicable to most vacuum system, and the interface is general, easily pressure regulating/change has the filtration, and the emission such as polluted gas is controlled a general vacuum safety valve.
At present, the patent name is a relief valve, and utility model patent that patent number is 201420006229.1 discloses a relief valve, including the valve body, be equipped with the exhaust hole on the valve body, at valve body internally mounted has a sealing washer, the center of sealing washer install on an L shape pull rod valve body outside welding L shape bracing piece, L shape upper end of support bar with the tip of L shape pull rod pass through pin sliding connection, be equipped with an extension spring between L shape pull rod and valve body, the buckle is on the extension spring on the lug of pull rod, the buckle is hung on the extension spring lower extreme on the lug of valve body. The lower end of the valve body is provided with external threads, the threads are provided with thread locking glue, and the upper part of the threads is provided with an outer hexagonal nut designed in an integrated manner with the valve body. The L-shaped support rod is provided with a sliding groove for the pin to slide, the end part of the L-shaped pull rod is provided with a U-shaped groove, and the L-shaped support rod is clamped in the U-shaped groove. The upper end of the valve body is provided with a dustproof cover.
The principle of this application is when the pressure of atmospheric pressure in the valve body is higher than the tensile of extension spring, and L shape pull rod and sealing washer promote the upward movement along with atmospheric pressure, and when the sealing washer was higher than the position of gas vent, gaseous from the gas vent discharge, atmospheric pressure descends rapidly, and when the pressure of atmospheric pressure was less than the tensile of extension spring, the extension spring drove L shape pull rod and sealing washer downstream, causes the sealing washer to plug up the gas vent, reaches sealed purpose.
The patent application that has disclosed above has simple structure, and the installation is dismantled conveniently, and the processing production of being convenient for has practiced thrift raw and other materials greatly, has reduced manufacturing cost simultaneously, and the practicality is strong. The application has the advantages of simple structure, convenient assembly and disassembly, convenient processing and production, great saving of raw materials, reduction of production cost, strong practicability, non-universal interface, no voltage regulation, and no filter system.
Disclosure of Invention
The invention provides a safety valve of a vacuum system, aiming at the defects of non-universal interface, inconvenience for pressure regulation and no filtering system in the prior art.
In order to solve the technical problem, the invention is solved by the following technical scheme:
the vacuum system safety valve comprises a valve seat and a valve core, wherein the valve core is movably arranged and controls the opening and closing of an installation valve, the valve seat comprises an air inlet and an air outlet, a filter screen is installed at the air inlet of the valve seat, and the filter screen comprises at least one fine filter screen and at least one coarse filter screen.
Preferably, the fine filter screen and the coarse filter screen are arranged in sequence along the gas flow direction, and the fine filter screen is a 150-mesh stainless steel filter screen.
Preferably, a filter screen groove is formed in the air inlet of the valve seat, a clamp spring is installed in the filter screen groove, the clamp spring is in contact with the fine filter screen or the coarse filter screen and tightly presses the fine filter screen and the coarse filter screen in the filter screen groove, and the clamp spring prevents the fine filter screen and the coarse filter screen from axially moving in the filter screen groove.
Preferably, the air inlet and the air outlet are respectively provided with an air inlet flange interface and an air outlet flange interface, the air inlet flange interface is a vacuum KF25 interface, and the air outlet flange interface is a vacuum KF40 interface.
Preferably, the valve core is fixedly arranged in the valve seat, the valve core is provided with a vertically arranged exhaust hole, a mandril is arranged in the exhaust hole, one end of the mandril close to the air inlet is defined as the lower end, the other end of the mandril is defined as the upper end, the valve core is provided with a sealing ring, the valve core further comprises a spring sleeved on the mandril, the lower end of the spring is contacted with the lower end of the mandril, and the upper end of the spring is contacted with the valve core and pulls the upper end of.
Preferably, the lower end of the ejector rod is provided with an external thread, the lower end of the ejector rod is provided with an adjusting nut matched with the external thread, the lower end of the spring is in contact with the lower end of the ejector rod through the adjusting nut, and the adjusting nut controls the compression amount of the spring.
Preferably, the sealing ring is positioned on the upper end surface of the valve core, the upper end of the ejector rod extends out of the exhaust hole and is connected with a pressure plate, the lower surface of the pressure plate is provided with a sealing ring extending downwards, the cross section of the sealing ring is in a sharp hook shape, the width of the sealing ring is gradually reduced along the downward direction, and the sealing ring is in contact with the sealing ring and is in compression fit with the sealing ring.
Preferably, the valve core comprises an upper valve core and a lower valve core, the upper valve core and the lower valve core are connected with each other, a valve core sealing ring is arranged at the joint of the upper valve core and the lower valve core, the exhaust hole is formed in the upper valve core, a sealing groove is formed in the upper end of the upper valve core, the sealing ring is arranged in the sealing groove, the lower valve core is a cylinder body with openings at two ends, the upper opening of the lower valve core is communicated with the exhaust hole, and the lower.
Preferably, the valve seat comprises a lower valve seat and an upper valve seat, and a valve seat sealing ring is arranged between the lower valve seat and the upper valve seat.
Preferably, the air inlet is disposed on the lower valve seat and the air outlet is disposed on the upper valve seat.
Due to the adoption of the technical scheme, the invention has the remarkable technical effects that:
(1) the safety valve adopts a mechanical principle, so that the problem that the safety valve cannot act correctly caused by a circuit problem is solved;
(2) the invention carries out standardized series design on the interface, the interface adopts a standard vacuum KF interface, and the interface adopts a standard fluorine rubber O-shaped ring and a stainless steel central bracket retainer, thereby ensuring the sealing performance and higher high temperature resistance; after the KF interface is adopted, the general purpose of the interface of the vacuum system is ensured, and the process of the vacuum system can be simplified during the design and safety improvement of the vacuum system;
(3) the invention meets the requirements of discharging gas to the atmosphere and discharging gas to the pipeline at the same time, and when the pipeline is discharged, the discharge port also adopts a KF interface design, thereby ensuring the interface universality and convenience of the gas outlet:
(4) according to the safety valve, the two stages of filter screen sheets are added at the air inlet, so that solid impurities in a vacuum system enter the safety valve along with air flow during positive pressure exhaust, the normal action of a pressure relief valve core of the safety valve is influenced, such as the dead locking of a spring, and the situations of pollution to a sealing O-shaped ring and the like are avoided;
(5) the pressure of the safety valve is adjusted in a pressure spring locking and adjusting mode, pressure relief pressure can be quickly calibrated when the safety valve leaves a factory according to actual operation requirements of different vacuum systems, and meanwhile, the pressure relief pressure can be quickly replaced due to the general KF interface design if the pressure relief pressure needs to be changed in the using process, so that the time cost is saved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a partial enlarged view i of fig. 1.
Fig. 3 is a partial enlarged view ii of fig. 1.
The names of the parts indicated by the numerical references in the drawings are as follows: 1-valve seat, 2-filter screen, 3-valve core, 4-ejector rod, 5-spring, 6-sealing ring, 7-snap spring, 101-lower valve seat, 102-upper valve seat, 103-valve seat sealing ring, 11-air inlet, 111-air inlet flange interface, 12-air outlet, 121-air outlet flange interface, 13-filter screen groove, 21-fine filter screen, 22-coarse filter screen, 301-upper valve core, 3011-seal groove, 302-lower valve core, 303-valve core sealing ring, 31-exhaust hole, 41-adjusting nut, 42-pressing plate, 421-sealing ring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
The vacuum system safety valve, as shown in the figure, includes disk seat 1 and case 3, case 3 activity setting and the control installation valve open and close, and disk seat 1 includes air inlet 11 and gas outlet 12, and the air inlet 11 department of disk seat 1 installs and installs filter screen 2, and filter screen 2 includes a fine filtration net 21 and a coarse filtration net 22.
The fine filter screen 21 and the coarse filter screen 22 are sequentially arranged along the gas flow direction, and the fine filter screen 21 is a 150-mesh stainless steel filter screen.
The fine filter screen 21 is a 150-mesh stainless steel filter screen, and is combined with the coarse filter screen 22 to form a filter system of the safety valve, so that solid impurities are shielded from falling into the safety valve body, and the influence of the solid impurities on the mechanical action of the safety valve is avoided; meanwhile, the valve body is kept clean, and the sealing effect caused by the pollution of a sealing O-shaped ring is avoided.
A filter screen groove 13 is formed in the air inlet 11 of the valve seat 1, a clamp spring 7 is installed in the filter screen groove 13, the clamp spring 7 is in contact with the fine filter screen 21 and tightly presses the fine filter screen 21 and the coarse filter screen 22 in the filter screen groove 13, and the clamp spring 7 prevents the fine filter screen 21 and the coarse filter screen 22 from axially moving in the filter screen groove 13.
Example 2
The difference is that the air inlet 11 and the air outlet 12 are respectively provided with an air inlet flange interface 111 and an air outlet flange interface 121, the air inlet flange interface 111 is a vacuum KF25 interface, and the air outlet flange interface 121 is a vacuum KF40 interface.
The interface adopts a vacuum KF interface, and the standard fluorine rubber O-shaped ring and a stainless steel central bracket retainer are adopted at the interface, so that the sealing performance and the high temperature resistance are ensured; after the KF interface is adopted, the interface of the vacuum system is guaranteed to be universal, and the process of the vacuum system can be simplified when the vacuum system is designed and safety is improved.
Example 3
The valve core 3 is fixedly arranged in the valve seat 1, the difference is that the valve core 3 is provided with a vertically arranged exhaust hole 31, an ejector rod 4 is arranged in the exhaust hole 31, one end of the ejector rod 4 close to the air inlet 11 is defined as a lower end, the other end of the ejector rod 4 is defined as an upper end, a sealing ring 6 is arranged on the valve core 1, the valve core further comprises a spring 5 sleeved on the ejector rod 4, the lower end of the spring 5 is in contact with the lower end of the ejector rod 4, and the upper end of the spring 5 is in contact with the valve core 3 and pulls the upper end of the.
The lower end of the ejector rod 4 is provided with an external thread, the lower end of the ejector rod 4 is provided with an adjusting nut 41 matched with the external thread, and the lower end of the spring 5 is contacted with the lower end of the ejector rod 4 through the adjusting nut 41.
The adjusting nut 41 controls the amount of compression of the spring 5. The adjusting nut 41 can change the amount of compression of the spring 5, thereby adjusting the relief pressure of the relief valve. When the adjustment nut 41 is adjusted upwards, the spring 5 is further compressed.
The sealing ring 6 is located the up end of case 3, and ejector pin 4 upper end stretches out outside exhaust hole 3 and is connected with clamp plate 42, is equipped with downwardly extending's sealing ring 421 on the lower surface of clamp plate 42, and the cross-section of sealing ring 421 is the sharp type that colludes that the width reduces gradually along the downward direction, and sealing ring 421 contacts and press fit with sealing ring 6, and ejector pin 4 receives spring 5's elastic force effect to move down and drives sealing ring 421 and compress tightly downwards on sealing ring 6.
When the gas pressure is lower than the locking force of the spring 5, the sealing ring 421 is tightly matched with the sealing ring 6 and compresses the sealing ring 6, so that the safety valve chamber is sealed and maintains the vacuum degree.
When the gas pressure is higher than the locking force of the spring 5, the gas pressure enables the ejector rod 4 to overcome the acting force of the spring 5 and jack up, and the sealing performance between the sealing ring 421 and the sealing ring 6 is damaged to release overpressure gas.
When the gas pressure is reduced to the set release pressure, the sealing ring 421 and the sealing ring 6 are sealed again.
Example 4
The valve core 3 comprises an upper valve core 301 and a lower valve core 302, the upper valve core 301 and the lower valve core 302 are connected with each other, a valve core sealing ring 303 is installed at the joint, an exhaust hole 3 is arranged on the upper valve core 301, a sealing groove 3011 is arranged at the upper end of the upper valve core 301, a sealing ring 6 is installed in the sealing groove 3011, the lower valve core 302 is a cylinder with openings at two ends, the upper opening of the lower valve core 302 is communicated with the exhaust hole 3, and the lower opening of the lower valve core 302 is communicated with an air inlet 11. The lower end of the plunger 4 is located in the lower spool 302.
Example 5
The same as the embodiment, except that the valve seat 1 includes a lower valve seat 101 and an upper valve seat 102, and a valve seat seal 103 is installed between the lower valve seat 101 and the upper valve seat 102.
The inlet port 11 is provided on the lower valve seat 101, and the outlet port 12 is provided on the upper valve seat 102.
The technical scheme of the application has the following advantages:
(1) the safety valve adopts a mechanical principle, so that the problem that the safety valve cannot act correctly caused by a circuit problem is solved;
(2) the invention carries out standardized series design on the interface, the interface adopts a vacuum KF interface, the interface adopts a standard fluorine rubber O-shaped ring and a stainless steel central bracket retainer, and the sealing performance and the high temperature resistance are ensured
(3) After the KF interface is adopted, the general purpose of the interface of the vacuum system is ensured, and the process of the vacuum system can be simplified during the design and safety improvement of the vacuum system;
(4) the invention meets the requirements of discharging gas to the atmosphere and discharging gas to the pipeline at the same time, and when the pipeline is discharged, the discharge port also adopts a KF interface design, thereby ensuring the interface universality and convenience of the gas outlet:
(5) according to the safety valve, the two stages of filter screen sheets are added at the air inlet, so that solid impurities in a vacuum system enter the safety valve along with air flow during positive pressure exhaust, the normal action of a pressure relief valve core of the safety valve is influenced, such as the dead locking of a spring, and the situations of pollution to a sealing O-shaped ring and the like are avoided;
(6) the pressure of the safety valve is adjusted in a pressure spring locking and adjusting mode, pressure relief pressure can be quickly calibrated when the safety valve leaves a factory according to actual operation requirements of different vacuum systems, and meanwhile, the pressure relief pressure can be quickly replaced due to the general KF interface design if the pressure relief pressure needs to be changed in the using process, so that the time cost is saved.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims (10)

1. Vacuum system relief valve, its characterized in that: including disk seat (1) and case (3), disk seat (1) includes air inlet (11) and gas outlet (12), and air inlet (11) department of disk seat (1) installs and installs filter screen (2), and filter screen (2) include at least one thin filter screen (21) and at least one coarse filtration net (22), and thin filter screen (21) and coarse filtration net (22) set gradually along the gas flow direction.
2. The vacuum system safety valve of claim 1, wherein: the fine filter screen (21) is a 150-mesh stainless steel filter screen.
3. The vacuum system safety valve according to claim 1 or 2, wherein: a filter screen groove (13) is formed in the air inlet (11) of the valve seat (1), a clamp spring (7) is installed in the filter screen groove (13), and the clamp spring (7) is in contact with a fine filter screen (21) or a coarse filter screen (22) and tightly presses the fine filter screen (21) and the coarse filter screen (22) in the filter screen groove (13).
4. The vacuum system safety valve of claim 1, wherein: an air inlet flange interface (111) and an air outlet flange interface (121) are respectively installed on the air inlet (11) and the air outlet (12), the air inlet flange interface (111) is a vacuum KF25 interface, and the air outlet flange interface (121) is a vacuum KF40 interface.
5. The vacuum system safety valve of claim 1, wherein: the valve core (3) is fixedly arranged in the valve seat (1), the valve core (3) is provided with an exhaust hole (31), an ejector rod (4) is arranged in the exhaust hole (31), one end, close to the air inlet (11), of the ejector rod (4) is defined as a lower end, the other end of the ejector rod (4) is defined as an upper end, a sealing ring (6) is arranged on the valve core (1), the valve core further comprises a spring (5) which is sleeved on the ejector rod (4), the lower end of the spring (5) is in contact with the lower end of the ejector rod (4), and the upper end of the spring (5) is in contact with the valve core (3) and pulls the upper end of the.
6. The vacuum system safety valve of claim 5, wherein: the lower end of the ejector rod (4) is provided with an external thread, the lower end of the ejector rod (4) is provided with an adjusting nut (41) matched with the external thread, and the lower end of the spring (5) is in contact with the lower end of the ejector rod (4) through the adjusting nut (41).
7. The vacuum system safety valve of claim 5, wherein: sealing washer (6) are located the up end of case (3), and ejector pin (4) upper end stretches out outside exhaust hole (3) and is connected with clamp plate (42), is equipped with downwardly extending's sealing ring (421) on the lower surface of clamp plate (42), and the cross-section of sealing ring (421) is the sharp type that colludes that the width reduces gradually along the downward direction, and sealing ring (421) and sealing washer (6) contact and compress tightly the cooperation.
8. The vacuum system safety valve of claim 5, wherein: valve core (3) include upper valve core (301) and lower valve core (302), upper valve core (301) and lower valve core (302) interconnect and install case sealing washer (303) in the junction, exhaust hole (3) set up on upper valve core (301), the upper end of upper valve core (301) is equipped with seal groove (3011), sealing washer (6) are installed in seal groove (3011), lower valve core (302) are both ends opening barrel, the upper shed and exhaust hole (3) intercommunication of lower valve core (302), the lower shed and air inlet (11) intercommunication of lower valve core (302).
9. The vacuum system safety valve of claim 1, wherein: the valve seat (1) comprises a lower valve seat (101) and an upper valve seat (102), and a valve seat sealing ring (103) is arranged between the lower valve seat (101) and the upper valve seat (102).
10. The vacuum system safety valve of claim 9, wherein: the air inlet (11) is arranged on the lower valve seat (101), and the air outlet (12) is arranged on the upper valve seat (102).
CN201911373253.2A 2019-12-27 2019-12-27 Safety valve of vacuum system Pending CN111075970A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911373253.2A CN111075970A (en) 2019-12-27 2019-12-27 Safety valve of vacuum system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911373253.2A CN111075970A (en) 2019-12-27 2019-12-27 Safety valve of vacuum system

Publications (1)

Publication Number Publication Date
CN111075970A true CN111075970A (en) 2020-04-28

Family

ID=70318292

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911373253.2A Pending CN111075970A (en) 2019-12-27 2019-12-27 Safety valve of vacuum system

Country Status (1)

Country Link
CN (1) CN111075970A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458905A (en) * 1979-11-26 1984-07-10 Vat Aktiengesellschaft Fur Vakuum-Apparate-Technik Sealing device for a high-vacuum closure
CN2083229U (en) * 1990-11-06 1991-08-21 永嘉县引配阀门厂 Negative pressure safety valve
JPH08193661A (en) * 1995-01-13 1996-07-30 Jatco Corp Oil seal device and discharge valve
CN2636018Y (en) * 2003-07-22 2004-08-25 刘万斌 Bypass check valve for lubricant filter
CN2740846Y (en) * 2004-10-15 2005-11-16 上海山阳化工设备厂 Built-in safety leakage-proof bottom valve of tank for tank car
CN207316161U (en) * 2017-11-01 2018-05-04 邛崃市欣凡尔阀业有限公司 One kind encryption double containment environmental protection check-valves
CN209204902U (en) * 2018-11-29 2019-08-06 苏州佳德净化科技有限公司 Use for laboratory air filter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458905A (en) * 1979-11-26 1984-07-10 Vat Aktiengesellschaft Fur Vakuum-Apparate-Technik Sealing device for a high-vacuum closure
CN2083229U (en) * 1990-11-06 1991-08-21 永嘉县引配阀门厂 Negative pressure safety valve
JPH08193661A (en) * 1995-01-13 1996-07-30 Jatco Corp Oil seal device and discharge valve
CN2636018Y (en) * 2003-07-22 2004-08-25 刘万斌 Bypass check valve for lubricant filter
CN2740846Y (en) * 2004-10-15 2005-11-16 上海山阳化工设备厂 Built-in safety leakage-proof bottom valve of tank for tank car
CN207316161U (en) * 2017-11-01 2018-05-04 邛崃市欣凡尔阀业有限公司 One kind encryption double containment environmental protection check-valves
CN209204902U (en) * 2018-11-29 2019-08-06 苏州佳德净化科技有限公司 Use for laboratory air filter

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Application publication date: 20200428

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