CN214999624U - Overvoltage protection valve - Google Patents

Abstract

The application relates to pressure equipment accessories specifically discloses an overvoltage protection valve, and it is including the valve body that has the inlet port, install pressure detection mechanism in the valve body, install on the valve body and be used for controlling the pressure source and stop supplying the disconnected pressure mechanism of pressure, disconnected pressure mechanism is including installing in the valve body inner chamber and the micro-gap switch that triggers by pressure detection mechanism, micro-gap switch is used for being connected with the control circuit electricity of pressure source. The mode that the detection cylinder body atress condition that this application adopted and control pressure source supplied pressure can follow the problem that the cylinder body internal pressure lasts the increase in the source, consequently has the effect that can effectively prevent the cylinder body and burst.

Description

Overvoltage protection valve

Technical Field

The application relates to the field of pressure equipment accessories, in particular to an overpressure protection valve.

Background

The main principle of the pressure equipment such as the air cylinder, the oil cylinder, the air gun and the like is that air or oil liquid is continuously injected into the cylinder body, and the air or oil liquid is driven by the compressed acting force, so that fluid such as the air or the oil liquid can generate large internal stress under the extrusion of the piston, and further pressure is applied to the inner wall of the cylinder body.

For the cylinder body of the air cylinder or the air gun, the pressure which can be borne by the cylinder body has a maximum upper limit, and when the pressure reaches the upper limit, the cylinder explosion accident can occur, in this case, the cylinder body which is exploded is equivalent to a small bomb, and the surrounding matters can be greatly damaged.

At present, there are two main ways to prevent cylinder from cracking, the first is to set the output pressure value of the air source or hydraulic source (collectively called pressure source) according to the designed bearing pressure of the cylinder, and avoid cylinder from cracking by maintaining the pressure of the input fluid within a safe range.

The precaution measure only considers the output condition of the pressure source, but not the pressure condition of the cylinder body, when the cylinder body is blocked due to faults, the interior of the cylinder body is in a closed state, or the external load borne by the cylinder body is too large, so that the piston stops moving, the pressure source cannot judge the stress condition of the cylinder body, the pressure can still be continuously input into the cylinder body, and under the condition, the cylinder body still has a large risk of cylinder explosion.

The second way is to install an overpressure protection valve on the air inlet end of the cylinder body for opening when the pressure in the cylinder body reaches a set value to release the pressure in the cylinder body, which is an improvement implemented on the basis of the first preventive way. For example, chinese utility model patent with an authorization publication number of CN203868417U discloses a pressure-adjustable overvoltage protection valve, which sets up an overvoltage protection hole on the valve body, the overvoltage protection hole is linked together with the valve cavity, and sets up the needle in the protection hole, and the needle can be opened by the promotion of pressure when the cylinder body is excessive pressure, lets the cylinder body carry out the pressure release through the protection hole.

Compared with the first mode, the second preventive measure directly realizes the opening and closing of the protective valve through the pressure inside the pressure equipment, mainly judges the pressure condition of the cylinder body, and has accurate action target, thereby having certain effect of preventing cylinder explosion. However, even if the protection hole is opened when the cylinder body is over-pressurized, the pressure source still cannot sense the stress condition of the cylinder body, the pressure source still can continuously input pressure into the cylinder body, and when the input pressure increment is larger than the maximum negative pressure value which can be discharged from the protection hole in unit time, the internal pressure of the cylinder body still can be continuously increased, and the hidden danger of cylinder explosion still exists.

In view of the above-mentioned related technologies, it can be known through analysis that the measures taken to prevent the cylinder from bursting in the existing pressure devices are only in the form of single-effect action of one of the pressure source or the pressure device, and cannot form mutual feedback between the pressure source and the pressure device serving as an execution component, so that the inventor thinks that none of the above-mentioned measures can achieve the purpose of effectively preventing the cylinder from bursting.

SUMMERY OF THE UTILITY MODEL

In order to effectively prevent the cylinder from bursting, the application provides an overpressure protection valve.

The application provides an overvoltage protection valve adopts following technical scheme:

the utility model provides an overvoltage protection valve, includes the valve body that has the inlet port, installs in the pressure measurement mechanism in the valve body, installs on the valve body and is used for the disconnected pressure mechanism that the control pressure source stopped supplying pressure, disconnected pressure mechanism is including installing in the valve body inner chamber and the micro-gap switch that is triggered by pressure measurement mechanism, micro-gap switch is used for being connected with the control circuit electricity of pressure source.

Through adopting above-mentioned technical scheme, the valve body is used for forming with pressure equipment's cylinder body and is connected, make the fluid in the pressure equipment can fill the valve body inner chamber in step through the inlet port, make pressure in the valve body keep unanimous with the cylinder body, so when pressure surpassed design early warning value in the cylinder body, pressure measurement mechanism is pressure drive, can trigger micro-gap switch, micro-gap switch is triggered the back, pass the control circuit of outage pulse signal for the pressure source, the outage after the pressure source obtained the signal this moment, no longer be cylinder body supply pressure, this kind of restriction mechanism, can follow the blow-up cause of cutting off pressure equipment from the source, and then effectively prevent the cylinder body and burst. And when the pressure in the cylinder body is lower than a designed early warning value, the microswitch bounces, the control signal transmitted to the pressure source by the microswitch is a pressure supply pulse signal, the pressure source is electrified and inputs pressure to the cylinder body, and the pressure equipment is prompted to continue to execute tasks.

Preferably, the pressure detection mechanism comprises a piston which is arranged in the valve body in a sliding manner and is positioned between the air inlet hole and the micro switch, and a pressure sensing assembly which is arranged in the valve body and is used for blocking the piston to move towards one side of the micro switch, wherein a pressure inlet air chamber communicated with the air inlet hole is formed between the piston and the valve head of the valve body.

Through adopting above-mentioned technical scheme, advance the pressure air chamber and pass through the inlet port and realize the concora crush with the cylinder body inner chamber, and the pressure sensing subassembly is used for providing thrust for the piston, hinder the piston and produce when not reaching early warning pressure and remove and the micro-gap switch is touched to the mistake, until advancing when the produced pressure of the indoor fluid of pressure exceeds the thrust that the pressure sensing subassembly provided, the piston can produce the motion, simultaneously because the piston is located between inlet port and the micro-gap switch, consequently the piston can produce the extrusion to the micro-gap switch, thereby make micro-gap switch produce the pulse signal that the control pressure source stopped to supply the pressure.

Preferably, the pressure sensing assembly comprises a pressure maintaining plug mounted on the valve body and a pressing piece mounted in the valve body and located between the piston and the pressure maintaining plug, and two ends of the pressing piece respectively abut against the piston and the pressure maintaining plug and apply thrust to the piston.

By adopting the technical scheme, the pressure maintaining plug is used for providing the pressure for the pressing piece, and the pressing piece can accumulate deformation potential energy after being extruded by the pressure maintaining plug and the piston, and the potential energy is expressed as providing thrust for the piston, so that the pressure maintaining purpose of the piston is realized.

Preferably, the piston and/or the pressure maintaining plug are/is provided with a force applying groove for embedding a pressure applying piece.

Through adopting above-mentioned technical scheme, the application of force groove can supply the casting die embedding, plays preliminary restraint effect to the casting die, and the crooked of casting die is executed in the restriction to make the casting die can be better with thrust action on the piston, the application of force groove accomodates the casting die simultaneously and can reduce the interference of casting die to the piston, increases the movable range of piston, thereby makes the piston can trigger micro-gap switch better.

Preferably, the pressing member comprises a spring, a pressure stabilizing member is arranged between the pressing member and the pressure maintaining plug, and the pressure stabilizing member is arranged in the center of the pressing member in a penetrating manner so as to limit the bending of the pressing member.

Through adopting above-mentioned technical scheme, the steady voltage piece can restrict the casting die and buckle, makes the produced power of casting die deformation transmit the piston better on to make the piston more acute to the perception of pressure variation in the cylinder body, thereby improves the validity that the cylinder explosion was prevented to the excessive pressure protection valve.

Preferably, the pressure maintaining plug is installed in the inner cavity of the valve body in a threaded connection mode.

Through adopting above-mentioned technical scheme, threaded connection's form makes the overvoltage protection valve can adjust according to the different of pressure equipment bearing pressure, and when twisting the pressurize end cap in toward the valve body, the deformation volume of executing the casting die increases, and the early warning pressure value of piston improves, and when twisting the pressurize end cap out toward the valve body outward, the deformation volume of executing the casting die reduces, and the early warning pressure value of piston reduces to make the overvoltage protection valve have better commonality.

Preferably, the pressurize end cap includes main turning round and fine turning round, main turning round threaded connection is in the inner chamber of valve body, set up threaded hole on the main turning round, fine turning round threaded connection is in the threaded hole on the main turning round, fine turning round place screw hole communicates with the force application groove, and the fine turning round passes behind the screw hole and inconsistent with the steady voltage piece.

Through adopting above-mentioned technical scheme, the main adjustment head regulation stroke is great for the pressure early warning value of adjusting the piston on a large scale, and the fine tuning is the little stroke motion, is used for the pressure early warning value of adjusting the piston on a small scale, and two kinds of regulation modes combine together, can improve the accuracy that the pressurize plug adjusted piston early warning pressure greatly.

Preferably, micro-gap switch includes the micro-gap contact and with the integrated integrative quick connector plug of micro-gap contact, the micro-gap contact inlays the inner chamber of locating the valve body, and the micro-gap contact is located pressure detection mechanism's motion route, quick connector plug is fixed in on the valve body, and is formed with on the quick connector plug and is used for conveniently forming the participating in of being connected with the accessory electricity.

By adopting the technical scheme, the micro contact generates a power-off pulse signal after being triggered, and the pins on the quick-connection plug can enable the micro contact to be connected with a pressure source or other accessories in an insertion mode, so that the standardization of the connection mode of the micro switch and the pressure source or the accessories is realized, and the universality of the overvoltage protection valve is improved.

Preferably, the microswitch further comprises an electrical connector provided with an insertion hole for insertion of the pin and a connection hole for insertion of a power cord of the pressure source.

When the standard connector is arranged on the wiring end of the pressure source, the quick-connection plug can be conveniently electrically connected with the pressure source, however, for most common pressure sources, the standard connector is not popularized at present, therefore, by adopting the technical scheme, the jack of the connector is used for being matched with the quick-connection plug, the wiring hole can be matched with any electric wire, and the connector serves as a switching element to realize the high universality of the overvoltage protection valve, so that the application not only considers the old industry scheme, but also provides a feasible industry standard scheme, and is beneficial to promoting the standardization process of the industry.

Preferably, a circuit breaker is arranged on the microswitch.

Some pressure sources are provided with automatic control circuits, and some pressure sources are only provided with two input and output terminals, by adopting the technical scheme, the input end and the power supply of the pressure source only provided with the input and output terminals can be transferred through the circuit breaker, so that after the microswitch is triggered, the circuit breaker can be controlled to be started, the pressure source is immediately powered off, and the aim of preventing the cylinder body from bursting is better achieved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the pressure supply mode of the pressure source is controlled by detecting the stress condition of the cylinder body, so that the problem of continuous increase of the internal pressure of the cylinder body can be solved from the source, and the cylinder body can be effectively prevented from bursting;

2. the wiring modes with various forms on the microswitch can increase the universality of the overvoltage protection valve, so that the overvoltage protection valve can provide safety protection in more fields;

3. the pressure maintaining plug in the threaded connection mode can adjust the deformation amount of the pressing piece to achieve the purpose of adjusting the early warning pressure value of the piston, and therefore the overpressure protection valve has wider universality.

Drawings

FIG. 1 is a schematic structural view of an overpressure protection valve as disclosed herein;

fig. 2 is a schematic cross-sectional structural view of a first embodiment of a valve body, a first embodiment of a pressure sensing assembly, a first embodiment of a pressure maintaining plug, and a first embodiment of a pressure breaking mechanism of the overpressure protection valve disclosed in the present application;

FIG. 3 is a schematic cross-sectional view of a second embodiment of a valve body, a first embodiment of a pressure sensing assembly, and a first embodiment of a pressure retention plug of the overpressure protection valve disclosed herein;

FIG. 4 is a schematic cross-sectional view of a second embodiment of a pressure sensing assembly and a second embodiment of a pressure retention plug of the overpressure protection valve disclosed herein;

FIG. 5 is a schematic cross-sectional view of a third embodiment of a pressure sensing assembly and a third embodiment of a pressure retention plug of the overpressure protection valve disclosed herein;

FIG. 6 is a schematic cross-sectional view of a fourth embodiment of a pressure retaining plug of the overpressure protection valve as disclosed herein;

FIG. 7 is a schematic structural diagram of an embodiment of an overpressure protection valve disclosed herein having a valve body with a line of warning pressure values;

FIG. 8 is a schematic structural diagram of a second embodiment of a pressure trip mechanism of the over-pressure protection valve disclosed herein;

FIG. 9 is a schematic structural view of a third embodiment of a pressure trip mechanism of the over-pressure protection valve disclosed in the present application

FIG. 10 is an exploded view of a third embodiment of a pressure trip mechanism of the overpressure protection valve as disclosed herein;

FIG. 11 is a schematic structural view of a fourth embodiment of a pressure trip mechanism of the over-pressure protection valve disclosed in the present application

Fig. 12 is a schematic diagram of an overpressure protection valve with a pressure relief vent as disclosed herein.

Description of reference numerals:

1. a valve body;

11. an air inlet; 12. a valve head; 121. a groove; 13. a split washer; 14. a switch hole; 15. a stepped convex ring;

2. a pressure detection mechanism;

21. a piston; 211. a pressure inlet air chamber;

22. a pressure sensing assembly;

221. a pressure maintaining plug; 222. applying a pressing piece; 223. a force application groove; 224. a stabilizer; 225. a convex disc; 226. performing main turning; 227. fine turning; 228. a threaded hole;

3. a pressure breaking mechanism;

31. a microswitch; 32. a control signal line; 33. a micro-motion contact; 34. quickly connecting a plug; 341. a pin; 35. a wire connector; 351. a jack; 352. a wiring hole; 36. a circuit breaker;

4. an indicator line;

5. a pressure value line;

6. a pressure relief vent;

7. a rubber ring;

8. a stopper piece;

81. and (6) threading holes.

Detailed Description

The present application is described in further detail below with reference to figures 1-12.

Example 1:

the embodiment discloses an overpressure protection valve, which refers to fig. 1, and comprises a valve body 1, wherein an air inlet hole 11 is formed in the valve body 1, and the air inlet hole 11 is used for being communicated with an inner cavity of a cylinder body of a pressure device, so that the internal pressure of the valve body 1 reaches the same degree with the cylinder body.

The structure of the valve body 1 can be in various forms, including an integrated type and a split type, wherein the integrated type can be formed by casting, namely the air inlet 11 and the inner cavity of the valve body 1 are formed by core mold support in the casting process. In order to facilitate the installation and the maintenance of the valve body 1, the present embodiment adopts a split structure, and the present embodiment mainly protects the split structure.

Referring to fig. 2, a specific structure of one of the split type valve bodies 1 disclosed in the present application is that, the valve body 1 is a stepped tubular cavity structure which runs through from end to end, a valve head 12 is installed at one end of the valve body 1 close to the air inlet 11, and an open retainer ring 13 is installed in the valve body 1 to prevent the valve head 12 from falling out of the valve body 1, at this time, the open retainer ring 13 and the air inlet 11 are respectively located at two sides of the valve head 12, and the open retainer ring 13 pushes the valve head 12 against a stepped convex ring 15 in an inner cavity of the valve body 1.

For the realization of ensureing to prevent pressure equipment and explode jar effect, be provided with pressure measurement mechanism 2 and disconnected pressure mechanism 3 on valve body 1, pressure measurement mechanism 2 is used for the accurate pressurized condition of grasping the cylinder body to when pressure surpassed cylinder body early warning pressure, trigger disconnected pressure mechanism 3, block in order to realize supplying pressure to pressure equipment. The pressure detecting mechanism 2 is embodied in a form including a piston 21 and a pressure sensing assembly 22, wherein the piston 21 is slidably mounted in the valve body 1, and a pressure inlet air chamber 211 communicated with the air inlet hole 11 is formed between the piston 21 and the valve head 12.

The pressure sensing assembly 22 includes a pressure maintaining plug 221 and a pressing member 222, the pressure maintaining plug 221 is fixedly mounted at one end of the valve body 1 far away from the valve head 12 by welding or the like, and seals an inner cavity of the valve body 1, the pressing member 222 is mounted in the valve body 1 and located between the pressure maintaining plug 221 and the piston 21, and the pressing member 222 is pressed by the pressure maintaining plug 221 and the piston 21, so as to apply a pushing force on the piston 21 to block the movement of the piston 21 when the pressure does not reach an early warning value.

Pressure break mechanism 3 is used for linking to each other with the control circuit of pressure source, and control pressure source disconnected confession pressure, concretely, pressure break mechanism 3 includes micro-gap switch 31, a switch hole 14 has been seted up on the lateral wall of valve body 1, switch hole 14 is linked together with the inner chamber part that valve body 1 is located between piston 21 and pressurize end cap 221, micro-gap switch 31 passes through switch hole 14 embedding valve body 1 in, and micro-gap switch 31 electricity is connected with the control signal line 32 that is arranged in inserting pressure source control circuit, the power cord of pressure source can be joined in to control signal line 32, and then the break-make electricity of control pressure source.

In order to limit the micro switch 31 from being separated from the valve body 1, a stop piece 8 is mounted on the valve body 1 through fasteners such as bolts, the stop piece 8 is used for closing the switch hole 14 and preventing the micro switch 31 from shaking in the switch hole 14, and a threading hole 81 for a control signal wire 32 to pass through is formed in the stop piece 8, so that the micro switch 31 is conveniently connected with a pressure source.

When the piston 21 is pushed by the pressure in the cylinder body to trigger the microswitch 31, the microswitch 31 transmits a power-off pulse signal to a control circuit of the pressure source to power off the pressure source, and the cylinder body of the pressure equipment does not receive pressure supply at the moment, so that the possibility of cylinder explosion of the pressure equipment is blocked from the source.

The implementation principle of an overpressure protection valve in the embodiment of the application is as follows: after installing on pressure equipment, valve body 1 keeps the same interior pressure with pressure equipment's cylinder body through inlet port 11, when pressure equipment's interior pressure reached the early warning value of design, piston 21 was promoted by pressure, touch micro-gap switch 31 produces the outage pulse signal, this outage pulse signal is transmitted for the pressure source after, the pressure source is cut off the power supply promptly, it no longer increases to lose its interior pressure of pressure equipment that the pressure source supplied pressure, the hidden danger of breaking the jar from the source, consequently, can realize the effect of effective prevention jar that explodes.

And when the pressure in the cylinder body is lower than the design early warning value, the control signal transmitted to the pressure source by the microswitch 31 is a pressure supply pulse signal, the pressure source is electrified and inputs pressure for the cylinder body, and the pressure equipment is prompted to continue to execute tasks.

Example 2:

in the practical use process, the piston 21 is found to occupy a part of space of the pressure inlet air chamber 211, even blocks the air inlet hole 11, so that the deviation exists between the internal pressure of the valve body 1 and the internal pressure of the pressure equipment, the pressure detection sensitivity of the pressure detection mechanism 2 to the cylinder body of the pressure equipment is not enough, and aiming at the problem, the application provides an improved optimization scheme for the structure of the protection valve on the basis.

An overpressure protection valve, which is different from embodiment 1 in that, referring to fig. 3, in order to ensure that the piston 21 does not completely occupy the space of the pressure air chamber 211 during the movement process, in another preferred embodiment, a groove 121 may be formed on the valve head 12, and the air inlet 11 is communicated with the groove 121, so that the piston 21 is blocked by the valve head 12 no matter how the piston moves, and the air inlet 11 cannot be completely blocked, thereby ensuring that the pressure in the cylinder of the pressure device can be transmitted to the valve body 1 in real time and acts on the piston 21, so as to improve the sensitivity of the piston 21 to the pressure sensing.

Example 3:

in the practical application process, it is found that the pressing element 222 cannot keep the concentricity completely consistent with the piston 21, so that the piston 21 can cause the pressing element 222 to be partially bent during the process of pressing the pressing element 222, the thrust of the pressing element 222 cannot be completely acted on the piston 21, the thrust generated by the pressing element 222 is not equal to the actual internal pressure of the pressure device, and the application provides a new improvement scheme on the basis of repairing the defect as much as possible.

An overpressure protection valve, which is different from the embodiment 1 or 2 in that, referring to fig. 4, in order to enable the thrust generated after the pressing member 222 is deformed to be better applied to the piston 21, in another preferred embodiment, a pressure applying groove 223 into which the end of the pressing member 222 is fitted may be formed in the pressure holding plug 221 and/or the piston 21, and at this time, the pressure holding plug 221 and/or the piston 21 may restrict the pressing member 222 so as to limit partial deformation of the pressing member 222, and the force applying groove 223 may restrict the displacement of concentricity between the pressing member 222 and the piston 21 during the movement of the piston 21, thereby enabling the pressure applied by the pressing member 222 to the piston 21 to be closer to the trigger pressure value required for preventing the explosion.

Example 4:

after improvement, the force application groove 223 can actually improve the perception sensitivity of the pressing element 222 to the internal pressure of the pressure device, but because the pressing element 222 needs to be ensured to be assembled, a space for bending deformation of the pressing element 222 still exists between the inner wall of the force application groove 223 and the pressing element 222, and therefore a small error still exists between the thrust of the pressing element 222 and the internal pressure of the pressure device.

An overpressure protection valve, which is different from embodiment 3 in that, referring to fig. 5, in order to further improve the accuracy of the pressure sensing of the pressure inside the cylinder by the pressure applying member 222, in another preferred embodiment, a pressure stabilizing member 224 may be additionally disposed between the pressure applying member 222 and the pressure maintaining plug 221, one end of the pressure stabilizing member 224 is inserted into the pressure applying member 222, the bending of the pressure applying member 222 is limited by its own rod, the other end of the pressure stabilizing member 224 abuts against the pressure maintaining plug 221, and at this time, one end of the pressure applying member 222 located in the pressure maintaining plug 221 abuts against a convex disc 225 at the end of the pressure stabilizing member 224.

The stabilizer 224 is inserted in the center of the pressing member 222 and can provide support to the pressing member 222 to further limit the bending of the pressing member 222, thereby improving the synchronization between the pushing force provided by the pressing member 222 and the pressure required to prevent the blow-out.

Example 5:

after a plurality of improvements, the overpressure protection valve can basically meet the effect of cylinder explosion prevention on pressure equipment, but because different pressure equipment has different parameters such as materials and processes, the upper limit of the pressure value which can be borne by the overpressure protection valve is different, the overpressure protection valve of the embodiment is adapted to different types of pressure equipment, or the pressing piece 222 is detached and replaced, or a specific overpressure protection valve is produced according to the type of a product, which causes the product universality of the application to be deficient, and therefore, the application provides further improvements on the scheme.

An overpressure protection valve, which is different from embodiment 4 in that, referring to fig. 5, in order to improve the versatility of the overpressure protection valve to pressure devices with different pressure-bearing capacities, in another preferred embodiment, a pressure-maintaining plug 221 may be installed in a valve body 1 in a threaded manner, at this time, by screwing the pressure-maintaining plug 221, the compression amount of the pressure-maintaining plug 221 on a pressing member 222 may be changed, and further, the thrust value that the pressing member 222 may provide for a piston 21 may be changed, so as to better adapt to the pressure devices with different pressure-bearing limits.

Example 6:

after the improvement and optimization are carried out again, the overpressure protection valve can be adjusted and switched among pressure devices of different types to achieve adaptation, however, only by screwing of the pressure maintaining plug 221, the thrust range of the pressing piece 222 capable of being adjusted is rough, and when the pressure bearing parameter difference between the two pressure devices is small, the screwing precision of the pressure maintaining plug 221 cannot be achieved, so that the scheme is improved and optimized again by the application aiming at the problem.

An overpressure protection valve, which is different from embodiment 5 in that, referring to fig. 6, in order to adjust the thrust force value that can be applied to the piston 21 by the pressing member 222 in a wider range, in another preferred embodiment, the pressure maintaining plug 221 may be provided separately, and specifically, the pressure maintaining plug 221 includes a main turn 226 and a fine turn 227, the main turn 226 is screwed to the valve body 1, and the force applying groove 223 is located on the main turn 226. The main adjuster 226 is provided with a screw hole 228 communicating with the biasing groove 223, the fine adjuster 227 is screwed into the screw hole 228, and one end of the fine adjuster 227 passing through the screw hole 228 abuts against the boss 225 of the pressure stabilizer 224.

The main regulator 226 has a large regulating stroke and is used for regulating the pressure early warning value of the piston 21 in a large range, the fine regulator 227 moves in a small stroke and is used for regulating the pressure early warning value of the piston 21 in a small range, and the two regulating modes are combined, so that the accuracy of the pressure-maintaining plug 221 in regulating the early warning pressure of the piston 21 can be greatly improved.

Example 7:

through the improvement again, the adjustment accuracy of the split pressure maintaining plug 221 is greatly improved, but after the main turning head 226 and the fine turning head 227 are screwed, the thrust value on the pressing piece 222 is not intuitively known, and therefore, the overvoltage protection valve is improved and upgraded again.

An overpressure protection valve is different from embodiment 6 in that, referring to fig. 7, in order to facilitate visual understanding of the pressure value of the pressing member 222 on the piston 21 when the pressure maintaining plug 221 is screwed, in other preferred embodiments, an indication line 4 may be scribed on the pressure maintaining plug 221, a pressure value line 5 may be scribed at a corresponding position on the valve body 1, and the pressure value line 5 aligned after the pressure maintaining plug 221 is screwed indicates the early warning pressure value reached by the pressure sensing component 22, so that the early warning pressure adjustment when the overpressure protection valve is adapted to different pressure devices is facilitated.

It should be noted that in the above embodiments, in order to ensure the sealing performance of the inner cavity of the valve body 1, sealing elements are required to be disposed between the valve head 12, the piston 21 and the valve body 1, and specifically, referring to any one of fig. 2 to 6, the sealing element may preferably be a rubber ring 7.

Example 8:

for the connection between circuit elements, the conventional method is to break the connection line between the two elements, and then wind the connection line with an electrical tape after the connection and winding, which is relatively original and tedious, so that the present application provides a new optimized scheme for the connection between the microswitch 31 and the pressure device.

An overpressure protection valve differs from the embodiment 1 in that, referring to fig. 8, in another preferred embodiment, when the control circuit on the pressure source has a standardized connection, the structure of the microswitch 31 can be optimally adjusted, in that the microswitch 31 comprises a micro contact 33 and a quick-connect plug 34, and the micro contact 33 is installed in the valve body 1 and is located on the movement path of the piston 21. The quick connector 34 and the micro contact 33 are integrated together, and are fixed on the outer wall of the valve body 1, and meanwhile, the quick connector 34 is provided with a pin 341 for conveniently matching with a pressure source or other accessories, so that when the micro switch 31 needs to be electrically connected with the pressure source, the quick connector 34 can be directly matched, and the overvoltage protection valve can be conveniently installed.

Example 9:

the quick-connect plug 34 indeed facilitates the electrical connection between the microswitch 31 and the pressure equipment to a large extent, but for the pressure equipment commonly used in the market at present, basically only a simple wire is used as an input and output port, so that the application optimizes the scheme for the situation and provides a universal scheme.

An overvoltage protection valve, which differs from the embodiment 8 in that, referring to fig. 9 and 10, in another preferred embodiment, when the control circuit on the pressure source does not have a standardized connection, the structure of the microswitch 31 can be modified in another way, in that the microswitch 31 further comprises a connector 35, the connector 35 is provided with a plug hole 351 for matching with a pin 341 on the quick-connect plug 34, and a connection hole 352 for inserting the power line of the pressure source is provided on the connector 35, so that when the microswitch 31 needs to establish an electrical connection with the pressure source, the power line of the pressure source can be inserted into the connection hole 352 to realize the electrical connection with the overvoltage protection valve in a conventional way, and this optimized way, the connection scheme of the microswitch 31 with the traditional connection terminal is maintained, and the connection scheme with the standardized fittings is provided, thereby being beneficial to promoting the formulation of industry standardization schemes.

Example 10:

after repeated tests and improvements, the overpressure protection valve can well achieve the effect of preventing the pressure equipment from exploding. However, some pressure devices are available in the market, and no control chip is provided, so that the on-off of the current can be realized only by the on-off of the switch when the pressure device is started or stopped.

An overvoltage protection valve, which is different from that of embodiment 9 in that, referring to fig. 11, in another preferred embodiment, when a pressure source does not have a control circuit capable of controlling power on and off, the structure of a microswitch 31 can be further optimized, specifically, a circuit breaker 36 is integrated into the microswitch 31, and the circuit breaker 36 can be mounted on the microswitch 31 in an integrated or pin-plugged manner, so that when the microswitch 31 is triggered by internal pressure of a pressure device, the circuit breaker 36 is started to cut off power, so that the pressure source electrically connected with the microswitch 31 is also powered off, and further, the pressure supply to the pressure device is stopped, thereby achieving the purpose of preventing explosion.

Example 11:

after the pressure equipment is supplied with pressure by interruption, the pressure in the pressure equipment is not necessarily released, and at the moment, if the pressure supply pipeline is directly pulled out to release the pressure of the pressure equipment, the pressure equipment is possible to cause play due to sudden pressure drainage, and in order to alleviate the problem, the application provides a selectable optimization scheme.

The overpressure protection valve is different from the embodiment 1 in that, referring to fig. 12, in another preferred embodiment, in order to alleviate the problem of the play caused by the sudden pressure drainage when the pressure supply pipeline is pulled out by the pressure equipment, the structure of the valve body 1 can be further optimized, specifically, a pressure relief hole 6 can be formed in the valve body 1, the pressure relief hole 6 is always blocked by a piston 21 under the condition that the piston 21 is not triggered by the pressure, and after the piston 21 is pushed by the internal pressure of the pressure equipment, the pressure relief hole 6 is communicated with a pressure inlet air chamber 211 to pre-exhaust the pressure for the pressure equipment, so that the problem of the play generated when the pressure equipment is pulled out is effectively alleviated, and therefore, the pressure relief hole 6 can be arranged at any position between the piston 21 and the microswitch 31.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (10)

1. An overpressure protection valve characterized by: including valve body (1) that has inlet port (11), install pressure detection mechanism (2) in valve body (1), install on valve body (1) and be used for controlling the pressure source to stop supplying disconnected pressure mechanism (3) of pressure, disconnected pressure mechanism (3) are including installing in valve body (1) inner chamber and receive micro-gap switch (31) that pressure detection mechanism (2) triggered, micro-gap switch (31) are used for being connected with the control circuit electricity of pressure source.

2. The overpressure protection valve of claim 1 wherein: the pressure detection mechanism (2) comprises a piston (21) which is arranged in the valve body (1) in a sliding mode and located between the air inlet hole (11) and the micro switch (31), and a pressure sensing assembly (22) which is arranged in the valve body (1) and used for blocking the piston (21) to move towards one side of the micro switch (31), wherein a pressure inlet air chamber (211) communicated with the air inlet hole (11) is formed between the piston (21) and the valve head (12) of the valve body (1).

3. The overpressure protection valve of claim 2 wherein: the pressure sensing assembly (22) comprises a pressure maintaining plug (221) installed on the valve body (1) and a pressing piece (222) installed in the valve body (1) and located between the piston (21) and the pressure maintaining plug (221), wherein two ends of the pressing piece (222) are respectively abutted against the piston (21) and the pressure maintaining plug (221) and apply thrust to the piston (21).

4. The overpressure protection valve of claim 3 wherein: and a force application groove (223) for embedding the pressing piece (222) is formed in the piston (21) and/or the pressure maintaining plug (221).

5. The overpressure protection valve of claim 4 wherein: the pressing piece (222) comprises a spring, a pressure stabilizer (224) is arranged between the pressing piece (222) and the pressure maintaining plug (221), and the pressure stabilizer (224) penetrates through the center of the pressing piece (222) to limit the bending of the pressing piece (222).

6. The overpressure protection valve of any of claims 3-5, wherein: the pressure maintaining plug (221) is installed in the inner cavity of the valve body (1) in a threaded connection mode.

7. Overpressure protection valve according to any of claims 4 or 5, characterized in that: the pressure maintaining plug (221) comprises a main turning head (226) and a fine turning head (227), the main turning head (226) is connected to the inner cavity of the valve body (1) in a threaded mode, a threaded hole (228) is formed in the main turning head (226), the fine turning head (227) is connected to the threaded hole (228) in the main turning head (226) in a threaded mode, the threaded hole (228) where the fine turning head (227) is located is communicated with the force application groove (223), and the fine turning head (227) is abutted to the pressure stabilizing piece (224) after penetrating through the threaded hole (228).

8. The overpressure protection valve of any of claims 1-5, wherein: micro-gap switch (31) include micro-gap contact (33) and with micro-gap contact (33) integrated quick-connect plug (34), micro-gap contact (33) are inlayed and are located the inner chamber of valve body (1), and micro-gap contact (33) are located the motion route of pressure detection mechanism (2), quick-connect plug (34) are fixed in on valve body (1), and are formed with on quick-connect plug (34) and are used for conveniently forming plug (341) of being connected with the accessory electricity.

9. The overpressure protection valve of claim 8 wherein: the microswitch (31) further comprises an electric connector (35), and the electric connector (35) is provided with a plug hole (351) for inserting the plug pin (341) and a wiring hole (352) for inserting a power line of a pressure source.

10. The overpressure protection valve of claim 9 wherein: the microswitch (31) is provided with a breaker (36).

Images