CN114151575A

CN114151575A - Gas valve

Info

Publication number: CN114151575A
Application number: CN202111513059.7A
Authority: CN
Inventors: 金根喜
Original assignee: Taizhou Meiyadi Fluid Intelligent Control Co ltd
Current assignee: Zhejiang Meiyadi Fluid Intelligent Control Co ltd
Priority date: 2021-12-12
Filing date: 2021-12-12
Publication date: 2022-03-08
Anticipated expiration: 2041-12-12
Also published as: CN114151575B; WO2023103064A1

Abstract

The invention provides a gas valve, and belongs to the technical field of gas accessories. It has solved the short scheduling problem of current gas valve life-span. This gas valve includes valve rod and valve body, be equipped with the case in the valve pocket, the case includes the casing, the casing is equipped with big fire hole, little fire hole and long naked light hole, the casing overcoat has outer gum cover, outer gum cover is to having link up in the radial direction has little fire venthole, big fire venthole and long naked light venthole, be equipped with big fire air duct on the valve body, little fire air duct and long naked light air duct, be equipped with in the casing and move ceramic chip and quiet ceramic chip, it has fan-shaped opening one to move the ceramic chip, the casing has linked firmly the base, the base supports in quiet ceramic chip and links firmly with quiet ceramic chip circumference, be equipped with interior gum cover in the casing, interior gum cover will move ceramic chip and quiet ceramic chip laminating department and surround sealedly, interior gum cover has the fan-shaped opening two that just axial overlaps with fan-shaped opening one angle is the same. The invention has the advantages of good sealing performance, good applicability, long service life and the like.

Description

Gas valve

Technical Field

The invention belongs to the technical field of gas accessories, and particularly relates to a gas valve.

Background

The existing gas appliances (household gas appliances, commercial gas appliances, outdoor gas appliances, industrial gas appliances and the like) control the gas flow through a plug valve so as to adjust the fire intensity.

The existing plug valve comprises a valve body, the valve body is provided with a valve cavity, a rotating plug is arranged in the valve cavity, a main shaft is pivoted on the valve body, a knob is connected on the main shaft, the main shaft and the plug are driven to rotate through the knob, and a gas passing channel arranged on the plug enables a gas inlet and a gas outlet of the valve cavity to be communicated, so that gas is supplied to a gas appliance.

The manufacturing of the gas plug valve belongs to an external (Italy and Germany) processing technology, the process is complex, the domestic manufacturing has larger limitation and high manufacturing cost, particularly, the processing of the conical surface of the outer wall of the valve core and the inner conical surface of the valve body has extremely high requirement on a processing machine tool, the rejection rate is high, the plug valve is only suitable for a low-pressure gas environment and cannot meet the use requirement of high-medium-pressure gas, the application range is small, the durability test of the plug valve is limited to 10-ten-thousand times of switching, the service life is not long enough, when the aperture of the air outlet hole of the valve core is required to be equal to 12mm or a larger flow is required, the aperture and the outer diameter of the valve body of the plug valve are required to be increased, the outer diameter of the valve core is also increased, the friction force of the conical surface is too large, the torsion of the plug valve is too large to be in a torsion value specified by national standards, the plug valve cannot be used, and in addition, when the valve core is slightly worn, and after the sealing agent between the plug valve core and the valve body is reduced or flows into the vent hole, the gas leakage phenomenon can occur, namely, gas can enter the gas outlets of small fire and big fire from the gap between the plug valve core and the valve body, so that the problem that the firepower section cannot be adjusted is caused.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a gas valve which is compact in structure, good in applicability, good in use stability and long in service life.

The purpose of the invention can be realized by the following technical scheme: a gas valve comprises a valve rod and a valve body, wherein a valve cavity is arranged in the valve body, the valve body is provided with a gas inlet end and a big and small fire gas outlet end which are communicated with the valve cavity, a valve core is arranged in the valve cavity, the outer wall of the valve rod is embedded with a first sealing ring which is sealed on the inner wall of the valve cavity, the valve core comprises a cylindrical shell which is axially limited and connected with the inner end of the valve rod, the shell is provided with a big fire hole, a small fire hole and a long fire hole which are radially communicated and are all in an arc groove shape, the small fire hole is positioned between the big fire hole and the long fire hole, the gas passing area of the big fire hole is larger than that of the small fire hole, an outer rubber sleeve which is sealed on the inner wall of the valve cavity is sleeved outside the shell, the outer rubber sleeve is radially communicated with the small fire gas outlet hole which is communicated with the small fire hole, the big fire gas outlet hole which is communicated with the big fire hole and the long fire outlet hole which is communicated with the long fire hole, the valve body is provided with a big fire air duct which leads the big fire air outlet end and the small fire air outlet end to be communicated with the big fire air outlet hole and a small fire air duct which leads the big fire air outlet end and the small fire air outlet end to be communicated with the small fire air outlet hole, the valve body is provided with a long open fire air outlet end and the valve body is internally provided with a long open fire air duct which leads the long open fire air outlet hole to be communicated with the long open fire air outlet end, the shell is internally provided with a movable ceramic chip which is driven by a valve rod to rotate in a circumferential direction, the movable ceramic chip is provided with a fan-shaped opening I which can be simultaneously communicated with the small fire hole, the big fire hole and the long open fire hole, the shell is internally provided with a static ceramic chip which is attached to the movable ceramic chip, the static ceramic chip is axially communicated with an air inlet hole which is communicated with the air inlet end, the shell is fixedly connected with a base which is supported on the static ceramic chip and is circumferentially fixedly connected with the static ceramic chip, the center of the base is provided with an air inlet hole, the inner end surface of the base is embedded with a sealing ring II which is sealed on the inner wall of the valve body, and a sealing ring III is embedded on the outer end surface of the base, the outer terminal surface of base has the spacing arch of a plurality of embedding valve bodies, the casing in be equipped with seal in the casing and move between the ceramic chip and follow up the synchronous pivoted inner rubber sleeve of ceramic chip, inner rubber sleeve will move ceramic chip and quiet ceramic chip laminating department and surround sealedly, inner rubber sleeve has the fan-shaped opening two that is the same with fan-shaped opening angle and axial overlaps.

The gas valve integrates the functions of ever-burning fire, small fire and big fire, and the valve core is assembled into an integrated structure, so the gas valve has compact structure and convenient assembly, and the valve body does not need to be processed with a conical hole, so the gas valve is convenient to process; the wear resistance of the movable ceramic chip and the static ceramic chip is good, the gas valve can be opened and closed for at least 50 ten thousand times through durability test, and the service life is long; the sealing ring I in the gas valve ensures the sealing property of the outer wall of the valve rod, the sealing ring II ensures the sealing between the static ceramic piece and the base, the sealing ring II provides elastic support to ensure that the static ceramic piece is always attached to the movable ceramic piece, the abrasion gap is compensated to ensure the sealing property between the movable ceramic piece and the static ceramic piece, the sealing ring III ensures the sealing property of the outer end of the base, the outer rubber sleeve ensures the sealing property between the outer rubber sleeve and the inner wall of the valve body, and the inner rubber sleeve ensures the sealing property between the movable ceramic piece and the static ceramic piece and between the movable ceramic piece and the shell, so the gas valve has good air tightness and no gas leakage, is not only suitable for a low-pressure gas environment, but also suitable for a medium-high pressure gas environment, has good applicability and good use stability; when a larger flow is needed, the air inlet can be enlarged, or the size of the valve core is integrally enlarged, but the opening and closing of the movable ceramic chip and the static ceramic chip are still realized, the torque can be slightly increased and cannot be linearly increased, and the valve core is in the torque specified by the national standard and can meet the use requirement of the large flow.

In the gas valve, the valve body is in threaded connection with a big fire adjusting screw which radially penetrates through a big fire vent channel, the inner end of the big fire adjusting screw is close to the inner end of the big fire outlet end and the small fire outlet end, the small fire vent channel comprises a small fire vent hole I, a small fire vent hole II and a small fire vent hole III, the small fire vent hole I penetrates from the top of the valve body to the small fire outlet hole, the top of the valve body is fixedly connected with a plugging piece for plugging the outer end of the small fire vent hole I, the inner end of the small fire vent hole III is communicated with the small fire vent hole I, the outer end of the small fire vent hole III penetrates through the inner wall of the big fire outlet end and the small fire outlet end, the small fire vent hole II penetrates through the valve body on the side of the big fire adjusting screw to the communication position of the small fire vent hole I and the small fire vent hole III, the small fire adjusting screw is in threaded connection with the small fire vent hole II, and the inner end of the small fire adjusting screw extends to the communication position of the small fire vent hole I and the small fire vent hole III, the ever-open fire vent passage comprises an ever-open fire vent hole I and an ever-open fire vent hole II, the ever-open fire vent hole I penetrates from the top of the valve body to the ever-open fire vent hole, the top of the valve body is fixedly connected with a blocking piece for blocking the outer end of the ever-open fire vent hole I, the ever-open fire vent hole II penetrates from the valve body on the side of the ever-open fire adjusting screw to the ever-open fire air outlet end, the ever-open fire vent hole I is communicated to the middle of the ever-open fire vent hole II, the ever-open fire adjusting screw is in threaded connection with the ever-open fire vent hole II, and the inner end of the ever-open fire adjusting screw extends to the joint of the ever-open fire vent hole II and the ever-open fire vent hole I.

The pilot fire adjusting screw, the small fire adjusting screw and the big fire adjusting screw are arranged on the same side, so that the adjusting operation is convenient, the plugging piece is a steel ball, and the plugging piece can be a plugging cap during actual manufacturing. The positions of the inner ends of the pilot fire adjusting screws, which are blocked at the connection positions of the pilot fire vent holes II and the pilot fire vent holes I, are changed by rotating the pilot fire adjusting screws, the air passing amount of the pilot fire air ducts is changed, and pilot fire is adjusted; the position of the inner end of the small fire adjusting screw, which is blocked at the communication position of the small fire vent hole I and the small fire vent hole III, is changed by rotating the small fire adjusting screw, the air passing amount of the small fire air duct is changed, and the small fire is adjusted; by rotating the big fire adjusting screw, the distance from the inner end of the big fire adjusting screw to the inner end of the big fire air outlet end and the big fire air outlet end is changed, the air passing amount of the big fire air channel is changed, and the big fire is adjusted.

In the gas valve, the inner end of the valve rod is inserted with a cutting sleeve in a circumferential limiting way, the cutting sleeve is provided with a plurality of clamping teeth which extend axially and are inserted and connected with the movable ceramic chip, the inner wall of the inner rubber sleeve is provided with a clamping block which protrudes radially outwards and clamps the part of each clamping tooth which protrudes radially outwards from the movable ceramic chip in the circumferential direction, two sides of each clamping block are respectively abutted and limited by the steps of the cutting sleeve and the steps of the movable ceramic chip, the inner rubber sleeve is further sealed between the cutting sleeve and the shell, the middle part of the inner wall of the valve rod is provided with a circle of convex ring which protrudes radially outwards, a push rod is axially penetrated in the convex ring, the push rod is sequentially sleeved with a spring, a gasket I, a sealing ring IV, a sealing ring V and a gasket II from outside to inside, the convex ring is positioned between the sealing ring IV and the sealing ring V, a snap spring is embedded on the push rod, the spring provides elasticity to enable the sealing ring IV to be sealed on the convex ring and enable the gasket II to enable the sealing ring V to be sealed on the gasket V to be abutted against the convex ring V, the valve body on be equipped with the solenoid valve, the valve body has the retaining ring that is located between base and the solenoid valve, the retaining ring center is for crossing the gas pocket, the inlet end communicates in the cavity that the valve body supplied power solenoid valve installation, the solenoid valve have and support in order to seal in the shutoff portion of retaining ring by the pressure spring, the inner axial of convex shoulder and the push rod that has radial evagination in the outer end of push rod is worn out cutting ferrule, is moved ceramic chip, quiet ceramic chip and base setting, the valve rod on be equipped with and drive the push rod when the valve rod rotates and push up the drive mechanism who touches shutoff portion and provide the restoring force for the push rod.

The outer end of the spring abuts against the convex shoulder, the inner end of the spring abuts against the first gasket, the elastic force of the spring enables the push rod to have a tendency of displacing towards the outer side of the valve rod, the clamp spring abuts against the second gasket, the second gasket abuts against the fifth sealing ring to enable the fifth sealing ring to be sealed on the convex ring, the elastic force of the spring acts on the first gasket, the first gasket abuts against the fourth sealing ring to enable the fourth sealing ring to be always sealed on the convex ring, and therefore air leakage at the convex ring is avoided, and the use stability is good; the clamping sleeve is arranged to facilitate valve rod processing and push rod assembly, the inner end of the valve rod is provided with two symmetrically-arranged grooves, the outer wall of the clamping sleeve is provided with a radially outward convex block embedded in the groove, and therefore circumferential limiting of the inner end of the valve rod and the clamping sleeve is achieved; the clamping sleeve drives the movable ceramic chip and the inner rubber sleeve to synchronously circulate through the clamping teeth, and the inner rubber sleeve ensures the sealing property between the clamping sleeve and the shell.

The electromagnetic valve is used for being connected with the thermocouple, so that the gas valve has a flameout protection function, when the gas valve is used, the valve rod rotates, the driving mechanism enables the push rod to be in top contact with the blocking part, the flame of a gas appliance enables the thermocouple to be heated, the generated temperature difference voltage enables the electromagnetic valve to overcome the elasticity of the pressure spring and adsorb the blocking part, the gas inlet end is communicated with the gas inlet and the gas inlet hole through the gas passing hole, and the driving mechanism enables the push rod to reset after the gas valve is used; in the use, after the flame of gas utensil extinguishes, the thermoelectric voltage disappears, and the solenoid valve cuts off the power supply, and the pressure spring makes shutoff portion shutoff once more in order to cross the gas pocket shutoff, cuts off the air feed, guarantees safety in utilization in the retaining ring.

In foretell gas valve, drive mechanism include that the cover is equipped with driving disk and reset spring on the valve rod, reset spring is located between driving disk and the valve body, the outer wall of driving disk has and is used for the spacing lug of circumference, the outer end of valve rod the spout of symmetry has, the outer end of push rod has radial evagination and lies in the slider in the spout, reset spring acts on the slider and makes the slider conflict in driving disk, radially wears to be equipped with the gag lever post on the valve rod, driving disk has mirror symmetry's spacing groove towards the terminal surface of gag lever post, one side cell wall of spacing groove is for supplying the gliding inclined plane of gag lever post, reset spring provides elasticity and makes the spacing groove be located the spacing groove. Drive the spacing casing in knob switch of disk circumference, the valve rod is driven by knob switch in order to do anticlockwise rotation during the use, the gag lever post oppresses in the inclined plane for drive the disk and to valve body side displacement, drive the disk and act on the slider, the slider touches shutoff portion in order to drive the push rod top along the spout, after the use, the valve rod drives the gag lever post and resets, reset spring provides elasticity and makes the gag lever post be located the spacing groove tank bottom again, reset spring also makes the push rod reset.

In foretell gas valve, the inner wall of cutting ferrule have radial protruding stop part in, stop part and move and be equipped with between the ceramic chip and seal in the sealing washer six of push rod, the outer wall of cutting ferrule have radial evagination and inlay in the bulge loop one of inner gum cover inner wall, the inner that quiet ceramic chip orientation moved the ceramic chip has axial extension's undergauge section, the external diameter of undergauge section be less than the external diameter of quiet ceramic chip, move the ceramic chip have with undergauge section isodiametric and the laminating portion of laminating, latch and the isodiametric setting of laminating portion, the inner wall of inner gum cover is sealed in latch, laminating portion and undergauge section three's outer wall, the outer wall of moving the ceramic chip have radial evagination and inlay in the bulge loop two of inner gum cover inner wall. The sixth sealing ring is sleeved on the push rod, the outer edge of the sealing ring is blocked by the inner wall of the cutting sleeve, and the sixth sealing ring is always sealed on the push rod, the blocking part and the movable ceramic chip, so that the sealing property is improved; the first convex ring improves the sealing property between the cutting sleeve and the inner rubber sleeve, the first convex ring plays a role in limiting the inner rubber sleeve, the inner rubber sleeve is prevented from axially moving and is prevented from being stressed and twisted, the inner rubber sleeve is stable in work, the movable ceramic piece and the static ceramic piece are tightly laminated due to the arrangement of the reducing section, the movable ceramic piece is smoothly rotated, the inner wall of the inner rubber sleeve is good in laminating property due to the outer wall of the clamping tooth with the same diameter, the laminating part and the reducing section, the sealing property is improved, the movable ceramic piece and the static ceramic piece cannot be dislocated due to the impact of high-pressure gas, the working stability is good, and the gas inlet is accurate; the second convex ring improves the sealing performance between the movable ceramic sheet and the inner rubber sleeve, and the two pairs of inner rubber sleeves of the second convex ring play a limiting role, so that the inner rubber sleeves are prevented from axially moving and are prevented from being stressed and twisted, and the inner rubber sleeves are stable in work.

In the gas valve, the outer wall of the outer rubber sleeve is provided with a plurality of convex rings III which protrude outwards in the radial direction, the small fire air outlet hole, the large fire air outlet hole and the long open fire air outlet hole are positioned between two convex rings III, and a convex rib I which protrudes out of the outer wall of the outer rubber sleeve in the axial direction and surrounds the small fire air outlet hole, the large fire air outlet hole and the long open fire air outlet hole in a separated mode is connected between the two convex rings III. The convex ring III enables the outer wall of the outer rubber sleeve to have good sealing performance, the convex rib I and the two convex rings are matched to enable the small fire air outlet hole, the large fire air outlet hole and the ever-burning open fire air outlet hole not to have air channeling problem, the small fire air outlet hole, the large fire air outlet hole and the ever-burning open fire air outlet hole can only give out air respectively, and the control of a fuel gas firepower section is accurate.

In the gas valve, the inner wall of the shell is provided with a plurality of radially outward convex rings embedded in the inner rubber sleeve, and the outer wall of the shell is provided with a plurality of radially outward convex rings embedded in the outer rubber sleeve. The fourth bulge loop makes the leakproofness between casing and the interior gum cover good, and the bulge loop plays limiting displacement in addition, avoids interior gum cover outer wall department axial displacement, avoids interior gum cover atress to twist reverse, and the job stabilization nature of interior gum cover is good, and the bulge loop makes the leakproofness between casing and the outer gum cover good.

In the gas valve, the small fire hole, the large fire hole and the long open fire hole are positioned between the two convex rings five, and a convex rib second which axially protrudes out of the outer wall of the shell and surrounds the small fire hole, the large fire hole and the long open fire hole in a separated mode is connected between the two convex rings five. Each convex rib two is matched with the two convex rings five to separate the small fire hole, the large fire hole and the long open fire hole from each other, so that the problem of gas channeling does not exist among the small fire hole, the large fire hole and the long open fire, the small fire hole, the large fire hole and the long open fire hole can only give out gas respectively, and the control accuracy of the gas fire section is improved.

In the gas valve, the inner end surface of the base is provided with a plurality of lugs which are axially outwards protruded and circumferentially and uniformly distributed, the outer wall of the static ceramic chip is provided with slots for the lugs to be inserted, the shell is provided with clamping ports for the lugs to be clamped in, and the outer wall of the base is provided with a convex ring six which is radially outwards protruded and embedded in the inner wall of the outer rubber sleeve. Therefore, the base and the shell are conveniently connected, the static ceramic chip is limited by the lug in the circumferential direction, and the sealing performance between the base and the inner wall of the outer rubber sleeve is further improved by the convex ring.

In foretell gas valve, the inner of valve rod insert the casing and the valve rod has the fender shoulder that supplies casing tip to lean on, the inner outer wall of valve rod have the radial evagination spacing ring of round, the outer wall of spacing ring conical surface that has the direction, the inner wall of casing has the spacing groove that adapts to in the spacing ring, the inner outer wall of valve rod inlay and be equipped with the sealing washer seven of sealing in the casing. During the equipment, the conical surface plays the guide effect, and the inner of the valve rod of being convenient for inserts the casing, and later the spacing ring is located the spacing groove for casing and valve rod axial are spacing, and this gas case equipment back, whole can not be loose, the transportation of being convenient for, and the leakproofness between the inner of valve rod and the shells inner wall has been guaranteed to sealing washer seven.

Compared with the prior art, the gas valve has compact integral structure, good integration, small volume and convenient installation and arrangement, can open and close for at least 50 ten thousand times through durability test, has long service life, does not need pause and can ignite in time, can select various ignition modes such as the prior direct-rotating electronic ignition mode, the push type electronic ignition mode or the pulse type ignition mode with a microswitch, does not need to change the use habit, has good sealing performance of a valve core, avoids gas leakage and blow-by, has superior sealing performance when closed, can be used repeatedly from long open fire, small fire to large fire, does not break the fire in the middle, has obvious fire section, is easy to control, has good use stability and long service life, is suitable for low-pressure, medium-pressure and high-pressure gas environments, can meet the use requirement of large flow, and can reduce the volume of a valve body of a large-flow gas valve, the applicability is good.

Drawings

Fig. 1 is a perspective view of the gas valve.

Fig. 2 is a structural sectional view of the gas valve.

Fig. 3 is a structural sectional view of the gas valve at the sections of a big fire air duct and a long open fire air duct.

Fig. 4 is a structural sectional view of the gas valve at the section of the small fire air duct.

Fig. 5 is a structural sectional view of the gas valve at the cross sections of the long open fire adjusting screw, the small fire adjusting screw and the large fire adjusting screw.

Fig. 6 is a perspective view of the valve core of the gas valve.

Fig. 7 is a structural sectional view of the valve core in the gas valve.

Fig. 8 is a three-dimensional structure view of the valve core of the gas valve without an outer rubber sleeve.

Fig. 9 is a three-dimensional structure view of the valve core of the gas valve without the outer rubber sleeve and the shell.

Fig. 10 is a three-dimensional structure diagram of the cutting sleeve in the gas valve.

Fig. 11 is a perspective view of the movable ceramic piece in the gas valve.

Fig. 12 is a perspective view of the inner rubber sleeve of the gas valve.

Fig. 13 is a three-dimensional structure view of the static ceramic piece in the gas valve.

Fig. 14 is a perspective view of the base of the gas valve.

Fig. 15 is a structural sectional view of the valve core when the gas valve is closed.

Fig. 16 is a structural section view of the valve core when the long open fire hole in the gas valve discharges gas.

Fig. 17 is a structural section view of the valve core when the long open fire hole and the small fire hole in the gas valve give out gas.

FIG. 18 is a sectional view of the valve core when the gas exits from the long open fire hole, the small fire hole and the large fire hole in the gas valve.

In the figure, 1, a valve rod; 101. a convex ring; 102. a limiting ring; 2. a valve body; 201. an air inlet end; 202. a strong fire air duct; 203. a small fire air duct; 2031. a small fire vent hole I; 2032. a small fire vent hole II; 2033. a small fire vent hole III; 204. an ever-open fire air duct; 2041. a first vent hole for ever-burning fire; 2042. a second vent hole for ever-burning fire; 205. a retainer ring; 2051. air passing holes; 3. the big and small fire outlet ends; 4. a valve core; 41. a housing; 411. a big fire hole; 412. a small fire hole; 413. a long open fire hole; 414. a convex ring IV; 415. a fifth convex ring; 416. a second convex rib; 42. an outer rubber sleeve; 421. a small fire vent hole; 422. big fire vent holes; 423. a pilot fire vent hole; 424. a convex ring III; 425. a first convex rib; 43. moving the ceramic sheet; 431. a first fan-shaped opening; 432. a convex ring II; 44. a static ceramic chip; 441. an air inlet; 442. a reducing section; 45. a base; 451. an air inlet; 452. a limiting bulge; 453. a lug; 454. a convex ring six; 46. an inner rubber sleeve; 461. a second fan-shaped opening; 462. a clamping block; 47. a card sleeve; 471. clamping teeth; 472. a blocking portion; 473. a first convex ring; 5. a first sealing ring; 6. the ever-burning fire air outlet end; 7. a second sealing ring; 8. a third sealing ring; 9. a big fire adjusting screw; 10. a blocking member; 11. a small fire adjusting screw; 12. adjusting screws for ever-burning fire; 13. a push rod; 131. a slider; 14. a spring; 15. a first gasket; 16. a fourth sealing ring; 17. a sealing ring V; 18. a second gasket; 19. a clamp spring; 20. an electromagnetic valve; 21. a pressure spring; 22. a plugging section; 23. driving the disc; 231. a bump; 232. a limiting groove; 233. an inclined surface; 24. a return spring; 25. a limiting rod; 26. a sixth sealing ring; 27. and a seventh sealing ring.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2, 3, 4, 5, 6, 7, 8 and 9, the gas valve comprises a valve rod 1 and a valve body 2, the valve body 2 is internally provided with a valve cavity, the valve body 2 is provided with an air inlet end 201 and a big fire outlet end 3 and a small fire outlet end 3 which are both communicated with the valve cavity, a valve core 4 is arranged in the valve cavity, a first sealing ring 5 sealed on the inner wall of the valve cavity is embedded on the outer wall of the valve rod 1, the valve core 4 comprises a cylindrical shell 41 axially and limitedly connected with the inner end of the valve rod 1, the shell 41 is provided with a big fire hole 411, a small fire hole 412 and a long fire hole 413 which are radially communicated and are all arc groove-shaped, the small fire hole 412 is positioned between the big fire hole 411 and the long fire hole 413, the over-air area of the big fire hole 411 is larger than that of the small fire hole 412, an outer rubber sleeve 42 sealed on the inner wall of the shell 41 is sleeved with the outer rubber sleeve 42, a small fire outlet hole 421 communicated with the small fire hole 412, a big fire hole 422 communicated with the big fire hole 411 and a long fire hole 423 communicated with the long fire hole 413, the valve body 2 is provided with a big fire air duct 202 which enables the big fire air outlet end 3 and the small fire air outlet end 3 to be communicated with the big fire air outlet hole 422 and a small fire air duct 203 which enables the big fire air outlet end 3 and the small fire air outlet end 3 to be communicated with the small fire air outlet hole 421, the valve body 2 is provided with a long open fire air outlet end 6 and the valve body 2 is provided with a long open fire air duct 204 which enables the long open fire air outlet hole 423 to be communicated with the long open fire air outlet end 6, the shell 41 is internally provided with a movable ceramic tile 43 which is driven by the valve rod 1 to rotate circumferentially, the movable ceramic tile 43 is provided with a fan-shaped opening 431 and the fan-shaped opening 431 can be simultaneously communicated with the small fire hole 412, the big fire hole 411 and the long open fire hole 413, the shell 41 is internally provided with a static ceramic tile 44 which is attached to the movable ceramic tile 43, the static ceramic tile 44 is axially communicated with an air inlet hole 441 communicated with the air inlet end 201, the shell 41 is fixedly connected with a base 45, the base 45 is supported on the static ceramic tile 44 and is fixedly connected with the air inlet hole 451 at the center of the base 45, the inner end surface of the base 45 is embedded with a sealing ring 7 which is sealed with the static ceramic tile 44, and the outer end surface of the base 45 is embedded with the outer end surface There is the third seal ring 8 sealed in the inner wall of the valve body 2, the outer end face of the base 45 has a plurality of limit protrusions 452 embedded in the valve body 2, in this embodiment, the limit protrusions 452 are cylindrical and symmetrically arranged, an inner rubber sleeve 46 sealed between the housing 41 and the movable ceramic sheet 43 and synchronously rotating along with the ceramic sheet 43 is arranged in the housing 41, the joint of the movable ceramic sheet 43 and the static ceramic sheet 44 is surrounded and sealed by the inner rubber sleeve 46, and the inner rubber sleeve 46 has a second fan-shaped opening 461 which has the same angle as the first fan-shaped opening 431 and is axially overlapped.

In more detail, the valve body 2 is in threaded connection with a big fire adjusting screw 9 which radially penetrates through the big fire vent 202, the inner end of the big fire adjusting screw 9 is close to the inner end of the big fire outlet end 3 and the small fire vent 203 comprises a small fire vent hole one 2031, a small fire vent hole two 2032 and a small fire vent hole three 2033, the small fire vent hole one 2031 penetrates through the small fire outlet hole 421 from the top of the valve body 2, the top of the valve body 2 is fixedly connected with a plugging member 10 which plugs the outer end of the small fire vent hole one 2031, the inner end of the small fire vent hole three 2033 is communicated with the small fire vent hole one 2031, the outer end of the small fire vent hole three 2033 penetrates through the inner wall of the big fire outlet end 3, the small fire vent hole two 2032 penetrates through the valve body 2 at the big fire adjusting screw 9 side to the communication position of the small fire vent hole one 2031 and the small fire vent hole three 2033, the small fire vent hole two 2032 is in threaded connection with the small fire adjusting screw 20311, and the inner end of the small fire adjusting screw 11 extends to the communication position of the small fire vent hole one 2031 and the small fire vent hole three small fire vent hole 2033, the ever-open-flame vent passage 204 comprises an ever-open-flame vent hole I2041 and an ever-open-flame vent hole II 2042, the ever-open-flame vent hole I2041 penetrates from the top of the valve body 2 to the ever-open-flame vent hole 423, the top of the valve body 2 is fixedly connected with a plugging piece 10 for plugging the outer end of the ever-open-flame vent hole I2041, the ever-open-flame vent hole II 2042 penetrates from the valve body 2 on the side of the ever-open-flame adjusting screw 9 to the ever-open-flame vent end 6, the ever-open-flame vent hole I2041 penetrates to the middle of the ever-open-flame vent hole II 2042, the ever-open-flame vent hole II 2042 is in threaded connection with an ever-open-flame adjusting screw 12, and the inner end of the ever-open-flame adjusting screw 12 extends to the joint of the ever-open-flame vent hole II 2042 and the ever-open-flame vent hole I2041.

As shown in fig. 2, 7, 10, 11, and 12, a cutting sleeve 47 is inserted into the inner end of the valve stem 1 in a circumferential limited manner, the cutting sleeve 47 has two clamping teeth 471 axially extending and inserted into the movable ceramic sheet 43, the inner wall of the inner rubber sleeve 46 has clamping blocks 462 radially protruding outward and clamping the part of each clamping tooth 471 radially protruding out of the movable ceramic sheet 43 in the circumferential direction, two sides of each clamping block 462 are respectively abutted and limited by the steps of the cutting sleeve 47 and the steps of the movable ceramic sheet 43, the inner rubber sleeve 46 is further sealed between the cutting sleeve 47 and the housing 41, the middle part of the inner wall of the valve stem 1 has a circle of radially protruding convex rings 101, a push rod 13 axially penetrates through the convex rings 101, the push rod 13 is sequentially sleeved with a spring 14, a first gasket 15, a fourth gasket 16, a fifth gasket 17, and a second gasket 18 from outside to inside, the convex rings 101 are located between the fourth gasket 16 and the fifth gasket 17, a snap spring 19 is embedded on the push rod 13, the spring 14 provides elastic force to enable the fourth sealing ring 16 to be sealed on the convex ring 101 and enable the clamp spring 19 to abut against the second gasket 18 to enable the fifth sealing ring 17 to be sealed on the convex ring 101, the valve body 2 is provided with the electromagnetic valve 20, the valve body 2 is provided with the check ring 205 positioned between the base 45 and the electromagnetic valve 20, the center of the check ring 205 is the air passing hole 2051, the air inlet end 201 is communicated with a chamber of the valve body 2 for installing the electromagnetic valve 20, the electromagnetic valve 20 is provided with the plugging portion 22 supported by the pressure spring 21 to be sealed on the check ring 205, the outer end of the push rod 13 is provided with a radial convex shoulder, the inner end of the push rod 13 axially penetrates through the clamping sleeve 47, the movable ceramic tile 43, the static ceramic tile 44 and the base 45, and the valve rod 1 is provided with a driving mechanism which drives the push rod 13 to abut against the plugging portion 22 and provides resetting force for the push rod 13 when the valve rod 1 rotates.

Drive mechanism includes that the cover is equipped with driving disk 23 and reset spring 24 on the valve rod 1, reset spring 24 is located between driving disk 23 and the valve body 2, the outer wall of driving disk 23 has the lug 231 that is used for circumference spacing, the outer end of valve rod 1 has the spout of symmetry, the outer end of push rod 13 has radial evagination and is located the slider 131 of spout, reset spring 24 acts on slider 131 and makes slider 131 conflict in driving disk 23, radially wear to be equipped with gag lever post 25 on the valve rod 1, driving disk 23 has mirror symmetry's spacing groove 232 towards the terminal surface of gag lever post 25, one side cell wall of spacing groove 232 is for supplying the gliding inclined plane 233 of gag lever post 25, reset spring 24 provides elasticity and makes spacing groove 232 be located the spacing groove 232.

The inner wall of the cutting sleeve 47 is provided with a radially inward convex blocking part 472, a sealing ring six 26 sealed on the push rod 13 is arranged between the blocking part 472 and the movable ceramic sheet 43, the outer wall of the cutting sleeve 47 is provided with a convex ring one 473 radially protruding outwards and embedded in the inner wall of the inner rubber sleeve 46, as shown in fig. 13, the inner end of the fixed ceramic sheet 44 facing the movable ceramic sheet 43 is provided with a reducing section 442 extending axially, the outer diameter of the reducing section 442 is smaller than that of the fixed ceramic sheet 44, the movable ceramic sheet 43 is provided with an attaching part which is equal in diameter to the reducing section 442 and is attached, the latch 471 is arranged equal in diameter to the attaching part, the inner wall of the inner rubber sleeve 46 is sealed on the outer walls of the latch 471, the attaching part and the reducing section 442, and the outer wall of the movable ceramic sheet 43 is provided with a convex ring two 432 radially protruding outwards and embedded in the inner wall of the inner rubber sleeve 46. The air inlet holes 441 of the static ceramic pieces 44 in this embodiment are composed of long open fire air inlet holes 441, small fire air inlet holes 441, and big fire air inlet holes 441, which correspond to the long open fire holes 413, the small fire holes 412, and the big fire holes 411 in sequence, so as to achieve the purpose of accurate air intake.

The outer wall of the outer rubber sleeve 42 is provided with three convex rings three 424 which protrude outwards in the radial direction, the small fire air outlet hole 421, the large fire air outlet hole 422 and the long open fire air outlet hole 423 are positioned between the two convex rings three 424, a convex rib one 425 which protrudes out of the outer wall of the outer rubber sleeve 42 in the axial direction and surrounds the small fire air outlet hole 421, the large fire air outlet hole 422 and the long open fire air outlet hole 423 in a separated mode is connected between the two convex rings three 424, and the other convex ring three 424 is arranged close to the base 45. The inner wall of the shell 41 is provided with two convex rings four 414 which are radially outwards protruded and embedded in the inner rubber sleeve 46, the outer wall of the shell 41 is provided with three convex rings five 415 which are radially outwards protruded and embedded in the outer rubber sleeve 42, the small fire hole 412, the large fire hole 411 and the long open fire hole 413 are positioned between the two convex rings five 415, a convex rib two 416 which is axially protruded out of the outer wall of the shell 41 and surrounds the small fire hole 412, the large fire hole 411 and the long open fire hole 413 separately is connected between the two convex rings five 415, and the other convex ring five 415 is arranged close to the base 45.

As shown in FIG. 14, the inner end surface of the base 45 has two axially outwardly protruding lugs 453 uniformly distributed circumferentially, the outer wall of the fixed ceramic tile 44 has slots into which the lugs 453 are inserted, the housing 41 has snap-in openings into which the lugs 453 snap, and the outer wall of the base 45 has a radially outwardly protruding collar six 454 embedded in the inner wall of the outer rubber sleeve 42. The inner end of the valve rod 1 is inserted into the shell 41, the valve rod 1 is provided with a retaining shoulder for the end part of the shell 41 to abut against, the outer wall of the inner end of the valve rod 1 is provided with a circle of limiting ring 102 protruding outwards in the radial direction, the outer wall of the limiting ring 102 is provided with a guiding conical surface, the inner wall of the shell 41 is provided with a limiting groove 232 matched with the limiting ring 102, and the outer wall of the inner end of the valve rod 1 is embedded with a sealing ring seven 27 sealed on the shell 41.

In the gas valve, the base 45 is limited on the valve body 2 through the limiting bulge 452, the base 45 cannot rotate, and the shell 41 fixedly connected with the base 45 and the outer rubber sleeve 42 on the shell 41 cannot rotate; as shown in fig. 15, when not in use, the first fan-shaped opening 431 of the movable ceramic tile 43 is sealed with the static ceramic tile 44, the second fan-shaped opening 461 of the inner rubber sleeve 46 is sealed with the inner wall of the shell 41, the gas entering from the gas inlet 451 flows to the gas inlet hole 441 of the static ceramic tile 44, and the gas driven ceramic tile 43 is sealed and cannot overflow; as shown in fig. 16, in use, the valve rod 1 is rotated, the valve rod 1 drives the movable ceramic tile 43 and the inner rubber sleeve 46 to rotate synchronously, the first fan-shaped opening 431 of the movable ceramic tile 43 is firstly communicated with the long open fire hole 413, the gas flowing in from the gas inlet end 201 flows to the long open fire hole 413 through the first fan-shaped opening 431 and the gas inlet hole 441, then flows to the long open fire outlet end 6 from the long open fire gas outlet hole 423 and the long open fire air duct 204, and is combusted by the long open fire; as shown in fig. 17, when the valve stem 1 is subsequently rotated, the first fan-shaped opening 431 of the movable ceramic piece 43 is communicated with the small fire hole 412, the gas flows from the first fan-shaped opening 431 and the second fan-shaped opening 461 to the small fire hole 412, and flows from the small fire air outlet hole 421 and the small fire air duct 203 to the big fire air outlet end 3 and the small fire air outlet end 3 for burning of the small fire, at this time, the first fan-shaped opening 431 is still communicated with the long open fire hole 413, the long open fire hole 413 still admits air, and the long open fire is still burning; as shown in fig. 18, the valve rod 1 is rotated, the first fan-shaped opening 431 of the movable ceramic sheet 43 is communicated with the big fire hole 411, the fuel gas flows from the big fire hole 411 to the big fire air outlet hole 422 and the big fire air duct 202, and then flows out from the big fire air outlet end 3 and the small fire air outlet end 3 for burning of the big fire, at this time, the first fan-shaped opening 431 and the second fan-shaped opening 461 are still communicated with the long open fire hole 413 and the small fire hole 412, and the long open fire, the small fire and the big fire are simultaneously burned; the valve rod 1 is rotated reversely, the valve rod 1 drives the movable ceramic sheet 43 and the inner rubber sleeve 46 to reset synchronously, and the big fire, the small fire and the long open fire are closed in sequence; the gas valve realizes the functions of independent long open fire combustion, long open fire and small fire combustion and big fire combustion, and has good applicability.

Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A gas valve comprises a valve rod (1) and a valve body (2), wherein a valve cavity is arranged in the valve body (2), the valve body (2) is provided with a gas inlet end (201) and a gas outlet end (3) for large fire and small fire which are communicated with the valve cavity, a valve core (4) is arranged in the valve cavity, the gas valve is characterized in that a first sealing ring (5) sealed on the inner wall of the valve cavity is embedded in the outer wall of the valve rod (1), the valve core (4) comprises a cylindrical shell (41) axially and limitedly connected with the inner end of the valve rod (1), the shell (41) is provided with a large fire hole (411), a small fire hole (412) and a long fire hole (413) which are radially communicated and are arc groove-shaped, the small fire hole (412) is positioned between the large fire hole (411) and the long fire hole (413), the gas passing area of the large fire hole (411) is larger than that of the small fire hole (412), and an outer rubber sleeve (42) sealed on the inner wall of the valve cavity is sleeved outside the shell (41), outer gum cover (42) radially link up and have little fire venthole (421) with little fire hole (412) intercommunication, big fire venthole (422) with big fire hole (411) intercommunication and long naked light venthole (423) with long naked light hole (413) intercommunication, valve body (2) on be equipped with make big fire end (3) of giving vent to anger communicate in big fire venthole (422) big fire air duct (202), make big fire end (3) of giving vent to anger communicate in little fire venthole (421) little fire air duct (203), be equipped with long naked light end (6) on valve body (2) and be equipped with in valve body (2) and make long naked light venthole (423) communicate in long naked light end (6) long naked light air duct (204), casing (41) in be equipped with and drive circumferential direction pivoted by valve rod (1) and move air duct (43), move opening (431) and fan-shaped opening one (412) can communicate little fire hole (412) simultaneously, The fire valve is characterized by comprising a big fire hole (411) and a long open fire hole (413), wherein a static ceramic sheet (44) attached to a movable ceramic sheet (43) is arranged in a shell (41), an air inlet hole (441) communicated with an air inlet end (201) is axially communicated with the static ceramic sheet (44), the shell (41) is fixedly connected with a base (45), the base (45) is supported on the static ceramic sheet (44) and is circumferentially and fixedly connected with the static ceramic sheet (44), the center of the base (45) is an air inlet (451) communicated with the air inlet hole (441), a sealing ring II (7) sealed on the static ceramic sheet (44) is embedded in the inner end face of the base (45), a sealing ring III (8) sealed on the inner wall of the valve body (2) is embedded in the outer end face of the base (45), a plurality of limiting bulges (452) embedded in the valve body (2) are arranged on the outer end face of the base (45), and an inner rubber sleeve (46) sealed between the shell (41) and the movable ceramic sheet (43) and synchronously rotating along with the movable ceramic sheet (43) is arranged in the shell (41), the inner rubber sleeve (46) surrounds and seals the joint of the movable ceramic piece (43) and the static ceramic piece (44), and the inner rubber sleeve (46) is provided with a second fan-shaped opening (461) which has the same angle with the first fan-shaped opening (431) and is axially overlapped.

2. The gas valve according to claim 1, wherein the valve body (2) is in threaded connection with a big fire adjusting screw (9) which radially penetrates through the big fire vent channel (202), the inner end of the big fire adjusting screw (9) is close to the inner end of the big fire vent end (3), the small fire vent channel (203) comprises a small fire vent hole I (2031), a small fire vent hole II (2032) and a small fire vent hole III (2033), the small fire vent hole I (2031) penetrates from the top of the valve body (2) to the small fire vent hole (421), the top of the valve body (2) is fixedly connected with a blocking piece (10) which blocks the outer end of the small fire vent hole I (2031), the inner end of the small fire vent hole III (2033) is communicated with the small fire vent hole I (2031), the small fire vent hole III (2033) penetrates to the inner wall of the big fire vent hole I (2033), and the small fire vent hole II (2032) penetrates from the valve body (2) on the side of the big fire adjusting screw (9) to the small fire vent hole I (1) and the small fire vent hole II (2033) and the inner wall of the small fire vent hole II (2033) and the small fire vent hole II (2033) are fixedly connected with the small fire vent hole I A communication part of the three (2033), a small fire vent hole two (2032) is in threaded connection with a small fire adjusting screw (11), the inner end of the small fire adjusting screw (11) extends to the communication part of the small fire vent hole one (2031) and the small fire vent hole three (2033), the long open fire vent channel (204) comprises a long open fire vent hole one (2041) and a long open fire vent hole two (2042), the long open fire vent hole one (2041) penetrates from the top of the valve body (2) to the long open fire vent hole (423), the top of the valve body (2) is fixedly connected with a blocking piece (10) for blocking the outer end of the long open fire vent hole one (2041), the long open fire vent hole two (2042) penetrates from the valve body (2) at the side of the large fire adjusting screw (9) to the long open fire end (6), the long open fire vent hole one (2041) communicates to the middle part of the long open fire vent hole two (2042), the long open fire vent hole two (2042) is in threaded connection with a long open fire adjusting screw (12), and the inner end of the long fire adjusting screw (2042) extends to the long open fire vent hole two (2042) ) And the junction of the ever-burning flame vent hole I (2041).

3. The gas valve as claimed in claim 1 or 2, wherein a ferrule (47) is inserted into the inner end of the valve stem (1) in a circumferentially limited manner, the ferrule (47) has a plurality of latches (471) axially extending and inserted into the movable ceramic sheets (43), the inner wall of the inner rubber sleeve (46) has clamping blocks (462) radially protruding outward and clamping the latches (471) radially protruding out of the movable ceramic sheets (43) in a partially circumferential manner, both sides of each clamping block (462) are respectively abutted and limited by steps of the ferrule (47) and steps of the movable ceramic sheets (43), the inner rubber sleeve (46) is further sealed between the ferrule (47) and the housing (41), a circle of radially protruding convex ring (101) is arranged in the middle of the inner wall of the valve stem (1), a push rod (13) axially penetrates through the convex ring (101), and a spring (14) is sequentially sleeved on the push rod (13) from outside to inside, The gasket I (15), the sealing ring IV (16), the sealing ring V (17) and the gasket II (18), the convex ring (101) is positioned between the sealing ring IV (16) and the sealing ring V (17), the push rod (13) is embedded with the clamp spring (19), the spring (14) provides elasticity to enable the sealing ring IV (16) to be sealed on the convex ring (101) and enable the clamp spring (19) to be abutted against the gasket II (18) so as to enable the sealing ring V (17) to be sealed on the convex ring (101), the valve body (2) is provided with the electromagnetic valve (20), the valve body (2) is provided with a check ring (205) positioned between the base (45) and the electromagnetic valve (20), the center of the check ring (205) is an air through hole (2051), the air inlet end (201) is communicated with a cavity for installing the electromagnetic valve (2) which is provided with the electromagnetic valve body (20), the electromagnetic valve (20) is provided with a plugging part (22) which is supported by the pressure spring (21) to be sealed on the check ring (205), the outer end of the push rod (13) is provided with a convex shoulder which protrudes outwards in the radial direction, the inner end of the push rod (13) axially penetrates through the clamping sleeve (47), the movable ceramic sheet (43), the static ceramic sheet (44) and the base (45) to be arranged, and a driving mechanism which drives the push rod (13) to push against the blocking part (22) and provides resetting force for the push rod (13) when the valve rod (1) rotates is arranged on the valve rod (1).

4. The gas valve according to claim 3, wherein the driving mechanism comprises a driving disk (23) and a return spring (24) sleeved on the valve rod (1), the return spring (24) is located between the driving disk (23) and the valve body (2), the outer wall of the driving disk (23) is provided with a projection (231) for circumferential limiting, the outer end of the valve rod (1) is provided with symmetrical sliding grooves, the outer end of the push rod (13) is provided with a slide block (131) which protrudes outwards in the radial direction and is located in the sliding grooves, the return spring (24) acts on the slide block (131) to enable the slide block (131) to abut against the driving disk (23), the valve rod (1) is radially provided with a limiting rod (25) in a penetrating manner, the end surface of the driving disk (23) facing the limiting rod (25) is provided with symmetrical mirror-image limiting grooves (232), one side groove wall of the limiting groove (232) is an inclined surface (233) for the limiting rod (25) to slide, the return spring (24) provides elastic force so that the limiting groove (232) is positioned in the limiting groove (232).

5. The gas valve as claimed in claim 4, wherein the inner wall of the ferrule (47) has a radially inward protruding stopper (472), a sealing ring six (26) sealed to the push rod (13) is disposed between the stopper (472) and the movable ceramic piece (43), the outer wall of the ferrule (47) has a first protruding ring (473) protruding radially outward and embedded in the inner wall of the inner rubber sleeve (46), the inner end of the static ceramic piece (44) facing the movable ceramic piece (43) has a reduced diameter section (442) extending axially, the outer diameter of the reduced diameter section (442) is smaller than the outer diameter of the static ceramic piece (44), the movable ceramic piece (43) has an engaging portion engaging with the reduced diameter section (442), the engaging tooth (471) is disposed at the same diameter as the engaging portion, the inner wall of the inner rubber sleeve (46) is sealed to the outer walls of the engaging tooth (471), the engaging portion and the reduced diameter section (442), and the outer wall of the movable ceramic piece (43) has a second protruding ring (432) protruding radially and embedded in the inner wall of the inner rubber sleeve (46).

6. The gas valve as claimed in claim 5, wherein the outer wall of the outer rubber sleeve (42) is provided with a plurality of radially outward convex third convex rings (424), the small fire air outlet hole (421), the large fire air outlet hole (422) and the long open fire air outlet hole (423) are positioned between two of the third convex rings (424), and a first convex rib (425) which axially protrudes out of the outer wall of the outer rubber sleeve (42) and surrounds the small fire air outlet hole (421), the large fire air outlet hole (422) and the long open fire air outlet hole (423) in a separated manner is connected between the two third convex rings (424).

7. The gas valve as claimed in claim 6, wherein the inner wall of the housing (41) has a plurality of radially outwardly projecting collars IV (414) embedded in the inner rubber sleeve (46), and the outer wall of the housing (41) has a plurality of radially outwardly projecting collars V (415) embedded in the outer rubber sleeve (42).

8. The gas valve as claimed in claim 7, wherein the small fire hole (412), the large fire hole (411) and the long open fire hole (413) are located between two convex rings five (415), and a convex rib two (416) which axially protrudes out of the outer wall of the housing (41) and surrounds the small fire hole (412), the large fire hole (411) and the long open fire hole (413) separately is connected between the two convex rings five (415).

9. The gas valve as claimed in claim 8, wherein the inner end surface of the base (45) has a plurality of axially outwardly protruding and circumferentially uniformly distributed lugs (453), the outer wall of the fixed ceramic piece (44) has slots for the lugs (453) to be inserted, the housing (41) has a clamping inlet for the lugs (453), and the outer wall of the base (45) has a radially outwardly protruding collar six (454) embedded in the inner wall of the outer rubber sleeve (42).

10. The gas valve as claimed in claim 1 or 2, wherein the inner end of the valve rod (1) is inserted into the housing (41) and the valve rod (1) has a shoulder against which the end of the housing (41) abuts, the outer wall of the inner end of the valve rod (1) has a ring of radially outward protruding limit ring (102), the outer wall of the limit ring (102) has a guiding conical surface, the inner wall of the housing (41) has a limit groove (232) adapted to the limit ring (102), and the outer wall of the inner end of the valve rod (1) is embedded with a seven sealing ring (27) sealed to the housing (41).