CN205423972U - Automatic relief valve of gas - Google Patents

Abstract

The utility model provides an automatic relief valve of gas belongs to valve technical field. It has solved the current gas safety valve scheduling problem that became invalid easily. This automatic relief valve of gas, including the case, the case includes the case cover, the front end of case cover is fixed with the gas valve bracket who has gas pocket no. 1, the rear end of case cover is equipped with the mount that has gas pocket no. 2, is provided with the valve cap that is used for sealed porosity no. 1 in the case cover, is connected with reset spring between valve cap and the gas valve bracket, be provided with between valve cap and the mount with the control by temperature change spring of reset spring coaxial line, the rear end and the mount of control by temperature change spring are connected, when the control by temperature change spring extended, the front end of control by temperature change spring supports pressed on the valve cap and makes the valve cap seal gas pocket no. 1. The gas leakage automatic protection has not only been realized but also realized the conflagration automatic protection to this relief valve, and difficult the inefficacy.

Description

A kind of automatic safety gas valve

Technical field

This utility model belongs to valve technology field, relates to a kind of pipeline valve, particularly relates to a kind of automatic safety gas valve.

Background technology

Along with the development of society, the extensive application of new forms of energy, combustion gas has become necessary fuel energy industrial and in life.In resident uses gas process, aging due to gas pipeline and connector, often cause gas leakage, thus combustion gas poisoning or explosion accident occur.

The open pipe gas proposed of Chinese patent literature data reveals Safety valve [application number: CN01233581.9；Authorization Notice No.: CN2498423Y], this Safety valve includes: valve body, back-up ring, drainage screen, elastic seal ring, globe valve, joint nut, globe valve control valve rod, external screw thread hollow screw, handle, sunk screw, elastic cover plate；Being provided with ring-shaped step in one end of globe valve through hole, on ring-shaped step, equipped fixing air valve frame, assembles valve rod valve plate on air valve frame, and spring is positioned at valve rod valve plate on air valve frame with outer Clip Reed.This valve has the function of protection automatically, when pipeline occurs the situation of gas leakage because of damaged, can automatically be blocked by gas in pipelines passage, realizes gas pipeline itself protection and security control automatically.But this security valve only could realize gas leakage protection automatically in the case of valve fully opens；Valve be in be not fully opened occur revealing such as semi-open state and pipeline time, valve can not realize automatically being blocked by gas in pipelines passage, and the leakage automatic protector of valve easily lost efficacy.Nor passage can be automatically blocked when breaking out of fire or environment temperature are too high.

Open a kind of automatic fuel-gas fire-proof safety valve device [application number: the CN03205587.0 proposed of Chinese patent literature data；Authorization Notice No.: CN2753932Y], including valve body, temperature-sensing element, holding frame, passageway break mechanism, the entry port of valve body has pipe screw thread, discharge port has pipe screw thread, it is provided with passageway break mechanism between entry port and the discharge port of valve body, passageway break mechanism is provided with connection slide bar, separating element, flexible member and encapsulant, connects slide bar between temperature-sensing element and separating element, valve body be connected slide bar have encapsulant.When ambient temperature is more than design temperature, temperature-sensing element fragmentation, under the action of the spring, connection slide bar, separating element move down, and passage is instantaneous to be cut off by separating element.There is the advantages such as full-automatic, dual-seal, good seal performance, dependable performance, high temperature resistant, safety is good.But the temperature-sensing element in this relief valve device just lost efficacy once fragmentation and can not re-use, and needed the relief valve device more renewed, and use cost is high.

Summary of the invention

The purpose of this utility model is the problems referred to above existed for prior art, it is proposed that a kind of automatic safety gas valve being difficult to lose efficacy.

The purpose of this utility model can be realized by following technical proposal:

A kind of automatic safety gas valve, including spool, described spool includes valve core housing, described valve core housing be fixedly arranged at the front end with the air valve frame with pore one, the rear end of described valve core housing is provided with the fixed mount with pore two, is provided with the bonnet for sealed porosity one in described valve core housing, it is characterized in that, being connected between described bonnet with air valve frame and have back-moving spring, be provided with the temperature control spring with back-moving spring coaxial line between described bonnet and fixed mount, the rear end of described temperature control spring is connected with fixed mount；When described temperature control spring extends, the front end of described temperature control spring is pressed on bonnet and makes bonnet by pore one closing.

Combustion gas is entered in valve core housing by the pore two of fixed mount, then flows out spool from the pore one of air valve frame.Bonnet can be produced thrust backward when back-moving spring is compressed；When combustion gas flows through bonnet, combustion gas applies pressure forward to bonnet.When combustion gas is at normal discharge, bonnet pressure experienced is identical with the size of thrust, is in dynamic stress poised state, so bonnet can not abut on air valve frame and by pore one closing, combustion gas simultaneously can walk around bonnet pore one outflow from air valve frame, and arranged at safety valve is in open mode.When there is leakage in combustion gas; increased by gas flow during bonnet; the pressure of bonnet is increased by combustion gas; when the thrust backward that back-moving spring produces can not resist the pressure that combustion gas produces; bonnet can not keep dynamic stress poised state; combustion gas is pressed against by bonnet on air valve frame so that bonnet is by pore one closing, and now relief valve cuts out, and therefore relief valve has the automatic protective effect of gas leakage.After the leakage point of combustion gas is repaired, the flow of combustion gas recovers normal, and bonnet is reduced by combustion gas pressure forward, and the bonnet spring that is reset is pushed open, and the pore one on air valve frame is opened, and combustion gas is flowed out from pore one again, and now relief valve is opened automatically.Combustion gas leak source is repaired rear relief valve and can normally use again, and relief valve can be reused and be difficult to lose efficacy.

Temperature control spring under room temperature state is in compressive state; temperature control spring during compression can not act on bonnet and make bonnet by pore one closing; the most just make; when room temperature state; the setting of temperature control spring do not interfere with bonnet and back-moving spring with the use of, do not interfere with the realization of relief valve gas leakage automatic protection functions.When temperature is increased to the deformation temperature of temperature control spring, temperature control spring extends, and its front end is resisted against on bonnet and makes bonnet by pore one closing, and now relief valve cuts out, and therefore relief valve has fire automatic protection effect.When temperature is less than the deformation temperature of temperature control spring, temperature control spring reverts to compressive state and can not act on bonnet, and the bonnet spring that is reset is pushed open, and the pore one on air valve frame is opened, and combustion gas is flowed out from pore one again, and relief valve is opened.Temperature is recovered normal rear relief valve and can normally be used again, and relief valve can be reused and be difficult to lose efficacy.Temperature control spring is coaxially set with back-moving spring, and bonnet can be avoided by the effect of moment to be produced upset, it is to avoid spool lost efficacy, so that relief valve is difficult to lose efficacy.

Being equipped with and using of back-moving spring, bonnet and temperature control spring in valve core housing, makes relief valve be swift in response when realizing wheel leakage protective and fire protection and can repeat to realize, has the characteristic being difficult to lose efficacy.And such valve core structure is the compactest, making relief valve install, to occupy space little.

In above-mentioned automatic safety gas valve, cylindrically, described bonnet be arranged in parallel described valve core housing with air valve frame and bonnet is vertical with the axis of valve core housing, the axis of described temperature control spring and the axis collinear of valve core housing.

Valve core housing is cylindrically conducive to combustion gas to be uniformly distributed in valve core housing, so that combustion gas is uniform to the pressure distribution of bonnet.Air valve frame be arranged in parallel with bonnet and vertical with the axis of valve core housing; the axis collinear of the axis of back-moving spring and the axis of temperature control spring and valve core housing; these are all conducive to the realization automatically protected of bonnet uniform force, beneficially relief valve, make relief valve be difficult to lose efficacy.

In above-mentioned automatic safety gas valve, described bonnet is in the form of annular discs and is made up of soft material, and the front end face of described bonnet has sealing bulge loop, when described sealing bulge loop and air valve frame rear end face against time pore one close.

The bonnet that soft material is made can seal with air valve frame well and coordinate the closing realizing pore one, reduces gap that may be present before bonnet and air valve frame, so that relief valve is difficult to lose efficacy.Bonnet arranges sealing bulge loop on front end face simultaneously, can alleviate the weight of bonnet self.Relief valve is usually horizontally mounted, if but relief valve can not keep level after mounting, the own wt of spool will affect the action of bonnet consequently, it is possible to cause relief valve to lose efficacy, and can reduce this impact by the weight reducing bonnet self, make relief valve be difficult to lose efficacy.

In above-mentioned automatic safety gas valve, automatic safety gas valve also includes outlet nozzle, front valve pocket and rear valve pocket, the front end of the rear end of described outlet nozzle and front valve pocket is fixing to be connected, and the front-end and back-end of described valve core housing are inserted into front valve pocket respectively and rear valve pocket is interior and formed threaded.

Relief valve can be made to be directly connected to the connecting tube on gas-cooker by outlet nozzle, make gas pipeline quick for installation.Valve core housing is threadeded with front valve pocket and rear valve pocket, facilitates dismounting and the relief valve connection in the duct of spool.

In above-mentioned automatic safety gas valve, it is provided with compression spring between described air valve frame and outlet nozzle, it is provided with pad between described outlet nozzle and compression spring, it is provided with ring-type shoulder block on the inwall of described outlet nozzle rear end, described pad is resisted against on ring-type shoulder block, the front end of described compression spring is resisted against on pad, and the rear end of described compression spring is resisted against on air valve frame.

If air valve frame can not be fixed on the front end of valve core housing, spool will lose efficacy.Compression spring acts on and makes air valve frame be tightly abutted against on the front end face of valve core housing on air valve frame, makes air valve frame be not easily disconnected from valve core housing, and relief valve is difficult to lose efficacy.Pad is resisted against on ring-type shoulder block, and one end of compression spring is resisted against on pad；After using pad between compression spring and ring-type shoulder block, compression spring will not abut directly against on ring-type shoulder block, so that outlet nozzle is difficult to be subject to crushing, makes relief valve be difficult to lose efficacy.

In above-mentioned automatic safety gas valve, described air valve frame includes chassis, and described chassis is in the form of annular discs and has described pore one, and the front end on described chassis has forwardly convex U-bracket, and described U-bracket has axially disposed pilot hole；Being fixedly connected with guide post on the front end face of described bonnet, described guide post passes pilot hole, and described back-moving spring is sleeved on guide post, and described back-moving spring front end is resisted against on U-bracket, and the rear end of described back-moving spring is resisted against on bonnet；Described guide post front end outer side mask limited location groove, snaps in spacing card in described stopper slot, described spacing card can be resisted against on the front end face of U-bracket.

The setting of guide post and pilot hole makes bonnet to seesaw vertically, is possible to prevent the situation that cannot seal pore one that bonnet causes because of dislocation.Bonnet pushed in the case of normal discharge open by back-moving spring, makes the gas circuit in relief valve tend to remain on, and in preventing bonnet from being sealed thus causing relief valve by pore one during normal use, gas circuit is cut off.Spacing card is possible to prevent guide post to depart from pilot hole, thus ensures the normal use of relief valve.These arrange and can prevent relief valve from situation about can not normally use occur, it is ensured that relief valve is difficult to lose efficacy.

In above-mentioned automatic safety gas valve, described fixed mount is in the form of annular discs and is fixedly connected with screw, and described screw passes fixed mount axially forward and formed threaded, has spring pad between described screw and fixed mount；Described temperature control spring it is set with on the stud of described screw.

Spring pad can make screw be difficult to loosen after being fixed on fixed mount；Stud has guide effect, makes the temperature control spring can be axially retractable, and bonnet can be made when temperature control spring is axially elongated to close the pore one on air valve frame rapidly.Connect the accuracy having the fixed mount of screw to improve temperature control spring action direction, make relief valve be difficult to lose efficacy.

In above-mentioned automatic safety gas valve, the front end face of described valve core housing being provided with annular recess one, the chassis of described air valve frame is fitted in annular recess one；Being provided with annular recess two on the rear end face of described valve core housing, described fixed mount is fitted in annular recess two.

Valve core housing front/rear end arranges annular recess and facilitates the installation of air valve frame and fixed mount, make air valve frame and fixed mount preferably be fixedly connected on before and after valve core housing on end face simultaneously, beneficially the normal use of relief valve, it is ensured that relief valve is difficult to lose efficacy.

In above-mentioned automatic safety gas valve, the front inner wall of described rear valve pocket being provided with annular shoulder, have sealing ring one between described fixed mount and annular shoulder, the front-end and back-end of described sealing ring one bear against on fixed mount and annular shoulder.

Between sealing ring one and fixed mount and annular shoulder against making fixed mount be fixed on the rear end face of valve core housing, sealing ring one has sealing function and is possible to prevent combustion gas to spill from the seam crossing of spool with rear valve pocket.

In above-mentioned automatic safety gas valve, the rear end of described rear valve pocket connects reducer union.

Select suitable reducer union can facilitate the connection of pipeline.

In above-mentioned automatic safety gas valve, being provided with cross section on the outside middle portion of described reducer union is orthohexagonal clamping part, in the front end of described reducer union is inserted into the rear end of rear valve pocket and formed threaded, the rear end lateral surface of described reducer union is provided with standard thread.

After the middle part of reducer union arranges clamping part, reducer union is installed and is put in place by the feature utilizing clamping part can be clamped by spanner.Threadeding with rear valve pocket in the front end of reducer union makes the easy to connect of reducer union and rear valve pocket.The standard thread of the rear end of reducer union can be arranged as required to into different models, and convenient pairing connects.

In above-mentioned automatic safety gas valve, the rear end of described reducer union connects pipe joint, it is provided with annular projection on the outer wall of described pipe joint, described annular projection is socketed with tightening nuts, between described tightening nuts and pipe joint rear end, is provided with elastic collar.

It is convenient to be facilitated by pipe joint connection air inlet pipe.Air inlet pipe more frame can be securely attached on pipe joint by tightening nuts and elastic collar.

In above-mentioned automatic safety gas valve, connect in described rear valve pocket and have ball valve.

Ball valve hand switch combustion gas can be passed through.When there is leakage or breaking out of fire in combustion gas, manual-lock ball valve while relief valve spool is automatically switched off, there is the effect of duplicate protection；Also ensure that simultaneously and can also close combustion gas when spool lost efficacy.Decrease jointing during separately installed ball valve in ball valve is arranged on rear valve pocket, decrease the generation of leak source, it is ensured that the normal work of relief valve.

In above-mentioned automatic safety gas valve, described pad includes 4 arc plates the most equally distributed, the external arc limit of 4 described arc plates is on same circumference, and the Inner arc limit of 4 described arc plates is connected to the strip-shaped blade of strip, and 4 described strip-shaped blade are connected with each other.

The pad of 4 strip-shaped blade and arc plate composition makes the structure of pad more stable, beneficially compression spring against, make relief valve be difficult to lose efficacy.

Compared with prior art, this automatic safety gas valve has the advantage that

Fixed mount temperature control spring assembly structure is set in valve core housing rear end while valve core housing front end arranges bonnet fixed mount combinative structure; not only achieve the automatic protection of gas leakage but also achieve fire automatic protection; and these structures just will not lose efficacy after one-off, relief valve is made to be difficult to lose efficacy.Bonnet fixed mount combinative structure have employed back-moving spring, guide post and pilot hole and spacing card, make bonnet stable and reliable in work, thus ensure that relief valve is difficult to lose efficacy.Fixed mount temperature control spring assembly structure have employed screw and spring pad, make temperature control spring action accurately and reliably.Air valve frame and fixed mount are fitted in the annular recess of valve core housing, facilitate the installation of relief valve；On relief valve, assembling reducer union and pipe joint etc., facilitate the connection of air inlet pipe；Ball valve is assembled, it is ensured that combustion gas can also be closed when spool lost efficacy in relief valve.

Accompanying drawing explanation

Fig. 1 is the structural representation of safety valve；

Fig. 2 is the structural representation of spool in safety valve；

Fig. 3 is air valve frame and the combination stereogram of bonnet in safety valve；

Fig. 4 is fixed mount and the combination stereogram of temperature control spring in safety valve；

Fig. 5 is the structural perspective of safety valve Intermediate gasket；

Fig. 6 is the structural perspective of reducer union in safety valve；

Fig. 7 is the state diagram of spool in safety valve when normal use；

Fig. 8 is the state diagram of spool in safety valve when combustion gas occurs to reveal；

Fig. 9 is the state diagram of spool in safety valve when breaking out of fire.

In figure, 1, outlet nozzle；1a, ring-type shoulder block；2, front valve pocket；3, spool；3a, valve core housing；3a1, annular recess one；3a2, annular recess two；3b, air valve frame；3b1, chassis；3b2, pore one；3b3, U-bracket；3b4, pilot hole；3c, bonnet；3c1, sealing bulge loop；3d, guide post；3d1, stopper slot；3e, back-moving spring；3f, spacing card；3g, fixed mount；3g1, pore two；3h, temperature control spring；3i, spring pad；3j, screw；4, rear valve pocket；4a, annular shoulder；4b, ball valve；5, pad；5a, arc plate；5b, strip-shaped blade；6, compression spring；7, sealing ring one；8, reducer union；8a, clamping part；9, pipe joint；9a, annular projection；10, tightening nuts；11, elastic collar.

Detailed description of the invention

The following is specific embodiment of the utility model and combine accompanying drawing, the technical solution of the utility model is further described, but this utility model is not limited to these embodiments.

Embodiment one

As it is shown in figure 1, automatic safety gas valve includes outlet nozzle 1, front valve pocket 2, spool 3, rear valve pocket 4, reducer union 8 and the pipe joint 9 being sequentially connected with.2～5 trapezoidal bulge loops it are provided with on the front end outer side face of outlet nozzle 1, preferably 3；After trapezoidal bulge loop, it is additionally provided with annular boss on the front end outer side face of outlet nozzle 1；Being provided with 2～5 annular seal grooves on the rear end lateral surface of outlet nozzle 1, preferably 3, in annular seal groove, correspondence is set with sealing ring two；Ring-type shoulder block 1a it is provided with on the inwall of outlet nozzle 1 rear end.In the front inner wall of front valve pocket 2, bulge loop is set；The rear end of the front end of outlet nozzle 1 valve pocket 2 in the past is inserted, and makes the annular boss on outlet nozzle 1 outer wall be resisted against on the bulge loop on front valve pocket 2 inwall, and sealing ring two is close on the inwall of front valve pocket 2；The junction glue of outlet nozzle 1 and front valve pocket 2 can be adhesively fixed.Spool 3 include valve core housing 3a, the front-end and back-end of valve core housing 3a be inserted into front valve pocket 2 and rear valve pocket 4 respectively in and formed threaded.

As shown in Figures 2 and 3, valve core housing 3a cylindrically, its front end face is provided with annular recess one 3a1, and the rear end face of valve core housing 3a is provided with annular recess two 3a2.Air valve frame 3b include chassis 3b1 in the form of annular discs, the chassis 3b1 of air valve frame 3b be fitted in annular recess one 3a1 and with the axis perpendicular of valve core housing 3a；Having pore one 3b2 on the 3b1 of chassis, the front end of chassis 3b1 is integrally formed with forwardly convex U-bracket 3b3, and the bottom of U-bracket 3b3 has the pilot hole 3b4 arranged along valve core housing 3a axis direction.The bonnet 3c that can move it is provided with along valve core housing 3a axis direction in the valve core housing 3a of 3b1 rear end, chassis, bonnet 3c is made up of soft material (such as rubber), bonnet 3c is in the form of annular discs and parallel with chassis 3b1, and the front end face of bonnet 3c is provided with sealing bulge loop 3c1.During bonnet 3c moves, seal bulge loop 3c1 to be resisted against on the 3b1 of chassis and be closed by pore one 3b2.The guide post 3d arranged along valve core housing 3a axis direction it is fixedly connected with on the front end face of bonnet 3c, guide post 3d passes pilot hole 3b4, back-moving spring 3e is sleeved on guide post 3d, the front end of back-moving spring 3e is resisted against on U-bracket 3b3, and the rear end of back-moving spring 3e is resisted against on the front end face of bonnet 3c.Guide post 3d front end outer side mask limited location groove 3d1, snaps in spacing card 3f, spacing card 3f and is positioned at before U-bracket 3b3, and can be resisted against during guide post 3d seesaws on U-bracket 3b3 front end face in stopper slot 3d1.

As shown in Figure 2 and Figure 4, fixed mount 3g is in the form of annular discs and has pore two 3g1, and fixed mount 3g is fitted in annular recess two 3a2；Screw 3j advances through fixed mount 3g along valve core housing 3a axis direction and is formed threaded, has spring pad 3i between screw 3j and fixed mount 3g；Being set with temperature control spring 3h, temperature control spring 3h and back-moving spring 3e coaxial line and the axis collinear with valve core housing 3a on the stud of screw 3j, the rear end of temperature control spring 3h is connected with fixed mount 3g, and the front end of temperature control spring 3h faces bonnet 3c；When temperature control spring 3h extends, the sealing bulge loop 3c1 that the front end of temperature control spring 3h is pressed on bonnet 3c and makes on bonnet 3c is resisted against on the chassis 3b1 of air valve frame 3b and is closed by pore one 3b2.Temperature control spring 3h is compressive state when room temperature state, as shown in Figure 2 and Figure 7.It is elongation state when the condition of high temperature such as more than 70 DEG C, as shown in Figure 9；When the condition of high temperature, the front end of temperature control spring 3h can be resisted against on bonnet 3c and promote bonnet 3c to be closed by pore one 3b2.During design screw 3j, it is also possible to select stud suitable length and the screw 3j can being resisted against on bonnet 3c, make user can be regulated the size of air demand by the stud of the regulation screw 3j length in fixed mount front end.Fixed mount 3g and valve core housing 3a can also be integrally machined molding.Temperature control spring 3h can also be directly connected to, it is also possible to round bar is set on the front end face of fixed mount 3g or hollow out pole pair temperature control spring 3h guides on the front end face of fixed mount 3g.The external diameter size of temperature control spring 3h can be identical with the diameter of bonnet 3c, it is also possible to less than the diameter of bonnet 3c.

As shown in Figure 1, it is provided with compression spring 6 between air valve frame 3b and outlet nozzle 1, pad 5 it is provided with between outlet nozzle 1 and compression spring 6, pad 5 is resisted against on ring-type shoulder block 1a, the front end of compression spring 6 is resisted against on pad 5, and the rear end of compression spring 6 is sleeved on U-bracket 3b3 and is resisted against on the 3b1 of chassis.Being provided with annular shoulder 4a in the front inner wall of rear valve pocket 4, have sealing ring 1 between fixed mount 3g and annular shoulder 4a, the front-end and back-end of sealing ring 1 bear against on fixed mount 3g and annular shoulder 4a；Connect in rear valve pocket 4 and have ball valve 4b；The rear end of rear valve pocket 4 is threaded reducer union 8.The rear end of reducer union 8 is threaded pipe joint 9, and the outer wall of pipe joint 9 is provided with annular projection 9a, annular projection 9a is socketed with tightening nuts 10, is provided with elastic collar 11 between tightening nuts 10 and pipe joint 9 rear end；Pipe joint 9 rear end can connect air inlet pipe.

As it is shown in figure 5, pad 5 has the external arc limit of 4 the most equally distributed arc plate 5a, 4 arc plate 5a on same circumference, the Inner arc limit of 4 arc plate 5a is connected to strip-shaped blade 5b of strip, and 4 strip-shaped blade 5b are connected with each other.

As shown in figures 1 to 6, in the front end of reducer union 8 can be inserted into the rear end of rear valve pocket 4 and formed threaded, it is provided with standard thread on the rear end lateral surface of reducer union 8, suitable standard thread model can be selected as required, make reducer union 8 be connected with pipe joint 9 pairing.Being provided with cross section on the outside middle portion of reducer union 8 is orthohexagonal clamping part 8a.When reducer union 8 is installed, blessing portion 8a can be clamped with spanner and make reducer union 8 installation put in place, so can avoid during using spanner, the ridge in reducer union 8 being produced destroying.

As it is shown in figure 1, the ball valve 4b being connected in rear valve pocket 4 includes core, valve rod, core sealing ring one, core sealing ring two and handle.Core is arranged in rear valve pocket 4, and core is with the passage of the front-end and back-end of valve pocket 4 after can connecting.The lower end of valve rod is connected with core, and the upper end of valve rod is connected with handle after passing rear valve pocket 4, is provided with valve stem packing ring between valve rod and rear valve pocket 4.Handle can be butterfly-shaped or strip, it is possible to use securing member connects fixing to handle and valve rod.Turning handle can band ovable valve stem and core rotate, and makes core can connect or block the front-end and back-end of rear valve pocket 4.It is provided with core shoulder block on the inwall of rear valve pocket 4 rear end, core sealing ring one is resisted against on core shoulder block, core sealing ring two is resisted against on the front end face of reducer union 8, and core is arranged between core sealing ring one and core sealing ring two and is resisted against on core sealing ring one and core sealing ring two.If ball valve 4b can not be connected in rear valve pocket 4, it is also possible to be directly connected to general fuel gas ball valve in the rear end of rear valve pocket 4, it is achieved the hand switch function of relief valve.

During installation, after outlet nozzle 1 is good with the fixed installation of front valve pocket 2, put into and make pad 5 to be resisted against on ring-type shoulder block 1a the rear end of pad 5 valve pocket 2 in the past again, again air valve frame 3b is fixed in annular recess one 3a1 of valve core housing 3a, again the rear end of compression spring 6 is sleeved on the U-bracket 3b3 of air valve frame 3b, the front end of valve core housing 3a is inserted into the rear end of front valve pocket 2 again and is formed threaded, now the front end of compression spring 6 is resisted against on pad 5, the rear end of compression spring 6 is resisted against on the chassis 3b1 of air valve frame 3b, air valve frame 3b is fixed on the front end face of valve core housing 3a.

Then will install in rear valve pocket 4 into ball valve 4b, then the rear end of valve pocket 4 after the front end insertion of reducer union 8 is formed threaded, and by the front end of reducer union 8, ball valve 4b is fixed in rear valve pocket 4.Again sealing ring 1 from the front loaded of rear valve pocket 4 and is resisted against annular shoulder 4a, again fixed mount 3g is fixed in annular recess two 3a2 of valve core housing 3a, again the front end sleeve of rear valve pocket 4 being contained in the rear end of valve core housing 3a and formed threaded, now the front end of sealing ring 1 is resisted against on fixed mount 3g.Last connecting tube joint 9 on the rear end of reducer union 8.

Outlet nozzle 1 front end connects escape pipe, and the rear end of pipe joint 9 connects air inlet pipe.Need to open ball valve 4b when connecting combustion gas, after combustion gas passes sequentially through pipe joint 9, reducer union 8, rear valve pocket 4 and ball valve 4b, spool 3, front valve pocket 2 and outlet nozzle 1, flow out from escape pipe.Combustion gas is when spool 3, and pore two 3g1 first passing through fixed mount 3g enters valve core housing 3a.If the flow of combustion gas is normal, as it is shown in fig. 7, combustion gas can not make bonnet 3c close pore one 3b2 on air valve frame 3b under the effect of back-moving spring 3e, combustion gas is flowed out from pore one 3b2.When leak source occurs in pipeline, combustion gas leaks out from leak source and causes the gas flow in pipeline to increase, and as shown in Figure 8, the combustion gas of big flow promotes bonnet 3c sealed porosity one 3b2, and pipeline gas circuit is cut off, and relief valve cuts out.Back-moving spring 3e compression when bonnet 3c seals pore one 3b2, after the leak source in pipeline is repaired, gas flow recovers normal, and back-moving spring 3e pushes bonnet 3c open, and combustion gas is flowed out again from pore one 3b2, and relief valve reopens.

As it is shown in fig. 7, use relief valve under Normal Environmental Temperature, temperature control spring 3h is in contraction state, and temperature control spring 3h during contraction state can not promote bonnet 3c sealed porosity one 3b2, and combustion gas is flowed out from pore one 3b2.As it is shown in figure 9, when ambient temperature is in the condition of high temperature, after such as breaking out of fire, ambient temperature is more than 70 DEG C, temperature control spring 3h extends, its rear end against or be fixed on fixed mount 3g, its front end is resisted against on bonnet 3c and makes bonnet 3c sealed porosity one 3b2, and relief valve is closed.When ambient temperature is recovered normal, temperature control spring 3h recovers in contraction state, and bonnet 3c is open under the effect of back-moving spring 3e, and combustion gas is flowed out from pore one 3b2, and relief valve is opened.When there is gas leakage or fire, relief valve can automatically shut down；After leak source reparation or fire terminate, relief valve also can turn on the most automatically.Relief valve has automatic leakage air protection and fire defencive function, and relief valve is not the part that single use i.e. lost efficacy simultaneously, can reuse and be difficult to lose efficacy.Relief valve uses mechanicalness device, is not afraid of greasy dirt impurity, is difficult to lose efficacy, and service life is long.Relief valve, except having automatic protective effect, also has hand switch function, even if spool 3 lost efficacy, it is also possible to by ball valve 4b manual-lock relief valve, make relief valve have double protection.

Specific embodiment described herein is only to this utility model spirit explanation for example.Described specific embodiment can be made various amendment or supplements or use similar mode to substitute by this utility model person of ordinary skill in the field, but without departing from spirit of the present utility model or surmount scope defined in appended claims.

Claims (14)

1. an automatic safety gas valve, including spool (3), described spool (3) includes valve core housing (3a), described valve core housing (3a) be fixedly arranged at the front end with the air valve frame (3b) with pore one (3b2), the rear end of described valve core housing (3a) is provided with the fixed mount (3g) with pore two (3g1), the bonnet (3c) for sealed porosity one (3b2) it is provided with in described valve core housing (3a), it is characterized in that, it is connected between described bonnet (3c) with air valve frame (3b) and has back-moving spring (3e), the temperature control spring (3h) with back-moving spring (3e) coaxial line it is provided with between described bonnet (3c) and fixed mount (3g), the rear end of described temperature control spring (3h) is connected with fixed mount (3g)；When described temperature control spring (3h) extends, the front end of described temperature control spring (3h) is pressed on bonnet (3c) above and makes bonnet (3c) be closed by pore one (3b2).

Automatic safety gas valve the most according to claim 1, it is characterized in that, described valve core housing (3a) is cylindrically, described bonnet (3c) be arranged in parallel with air valve frame (3b) and bonnet (3c) is vertical with the axis of valve core housing (3a), the axis of described temperature control spring (3h) and the axis collinear of valve core housing (3a).

Automatic safety gas valve the most according to claim 1, it is characterized in that, described bonnet (3c) is in the form of annular discs and is made up of soft material, there is on the front end face of described bonnet (3c) sealing bulge loop (3c1), when described sealing bulge loop (3c1) and air valve frame (3b) rear end face against time pore one (3b2) close.

Automatic safety gas valve the most according to claim 1, it is characterized in that, automatic safety gas valve also includes outlet nozzle (1), front valve pocket (2) and rear valve pocket (4), the front end of the rear end of described outlet nozzle (1) and front valve pocket (2) is fixing to be connected, and the front-end and back-end of described valve core housing (3a) are inserted into front valve pocket (2) respectively and rear valve pocket (4) is interior and formed threaded.

Automatic safety gas valve the most according to claim 4, it is characterized in that, it is provided with compression spring (6) between described air valve frame (3b) and outlet nozzle (1), pad (5) it is provided with between described outlet nozzle (1) and compression spring (6), ring-type shoulder block (1a) it is provided with on the inwall of described outlet nozzle (1) rear end, described pad (5) is resisted against on ring-type shoulder block (1a), the front end of described compression spring (6) is resisted against on pad (5), and the rear end of described compression spring (6) is resisted against on air valve frame (3b).

Automatic safety gas valve the most according to claim 1, it is characterized in that, described air valve frame (3b) includes chassis (3b1), described chassis (3b1) is in the form of annular discs and has described pore one (3b2), the front end on described chassis (3b1) has forwardly convex U-bracket (3b3), and described U-bracket (3b3) has axially disposed pilot hole (3b4)；Guide post (3d) it is fixedly connected with on the front end face of described bonnet (3c), described guide post (3d) passes pilot hole (3b4), described back-moving spring (3e) is sleeved on guide post (3d), described back-moving spring (3e) front end is resisted against on U-bracket (3b3), and the rear end of described back-moving spring (3e) is resisted against on bonnet (3c)；Described guide post (3d) front end outer side mask limited location groove (3d1), snapping in spacing card (3f) in described stopper slot (3d1), described spacing card (3f) can be resisted against on the front end face of U-bracket (3b3).

Automatic safety gas valve the most according to claim 1, it is characterized in that, described fixed mount (3g) is in the form of annular discs and is fixedly connected with screw (3j), described screw (3j) passes fixed mount (3g) axially forward and is formed threaded, has spring pad (3i) between described screw (3j) and fixed mount (3g)；Described temperature control spring (3h) it is set with on the stud of described screw (3j).

Automatic safety gas valve the most according to claim 6, it is characterized in that, being provided with annular recess one (3a1) on the front end face of described valve core housing (3a), the chassis (3b1) of described air valve frame (3b) is fitted in annular recess one (3a1)；Being provided with annular recess two (3a2) on the rear end face of described valve core housing (3a), described fixed mount (3g) is fitted in annular recess two (3a2).

Automatic safety gas valve the most according to claim 4, it is characterized in that, it is provided with annular shoulder (4a) in the front inner wall of described rear valve pocket (4), having sealing ring one (7) between described fixed mount (3g) and annular shoulder (4a), the front-end and back-end of described sealing ring one (7) bear against on fixed mount (3g) and annular shoulder (4a).

Automatic safety gas valve the most according to claim 4, it is characterised in that the rear end of described rear valve pocket (4) connects reducer union (8).

11. automatic safety gas valves according to claim 10, it is characterized in that, being provided with cross section on the outside middle portion of described reducer union (8) is orthohexagonal clamping part (8a), in the front end of described reducer union (8) is inserted into the rear end of rear valve pocket (4) and formed threaded, the rear end lateral surface of described reducer union (8) is provided with standard thread.

12. automatic safety gas valves according to claim 10, it is characterized in that, the rear end of described reducer union (8) connects pipe joint (9), annular projection (9a) it is provided with on the outer wall of described pipe joint (9), it is socketed with tightening nuts (10) on described annular projection (9a), between described tightening nuts (10) and pipe joint (9) rear end, is provided with elastic collar (11).

13. automatic safety gas valves according to claim 4, it is characterised in that connect in described rear valve pocket (4) and have ball valve (4b).

14. automatic safety gas valves according to claim 5, it is characterized in that, described pad (5) includes 4 the most equally distributed arc plates (5a), the external arc limit of 4 described arc plates (5a) is on same circumference, the Inner arc limit of 4 described arc plates (5a) is connected to the strip-shaped blade (5b) of strip, and 4 described strip-shaped blade (5b) are connected with each other.