A gas valve

Abstract

The present invention provides a gas valve, belonging to the technical field of gas accessories. It solves the problems of poor applicability of existing gas valves. The gas valve comprises a valve body, a valve core is arranged in the valve cavity, the valve core is spherical and the outer end of the valve core is connected to the valve stem, a vent hole is arranged at the inner end of the valve core, a first gas hole and a second gas hole are radially arranged in the middle of the valve core, the aperture of the first gas hole is larger than the aperture of the second gas hole and the angle between the first gas hole and the second gas hole is 90-120°, the valve cavity between the right side of the valve core and the valve body is a vent cavity, a high-fire vent is arranged in the valve body, a low-fire vent is arranged in the valve body, the aperture of the high-fire vent is larger than the aperture of the low-fire vent, a long-fire air outlet is arranged at the top of the valve body and a long-fire air outlet connecting the long-fire air outlet and the vent cavity is arranged in the valve body. The present invention has the advantages of compact structure, good applicability and long service life.

Description

Technical Field

[0001] The invention belongs to the technical field of gas accessories, and in particular relates to a gas valve. Background Art

[0002] Existing gas stoves (domestic gas stoves, commercial gas stoves, outdoor gas stoves, industrial gas stoves, etc.) control the gas flow through a plug valve to adjust the size of the fire. The existing plug valve includes a valve body, which has a valve cavity, in which a rotating plug is arranged, a main shaft is pivotally connected to the valve body, and a knob is connected to the main shaft. The main shaft and the plug are driven to rotate by the knob, and the gas passage provided on the plug connects the gas inlet and the gas outlet of the valve cavity, thereby supplying gas to the gas stove.

[0003] In order to increase safety and prevent gas leakage after the gas appliance is turned off, a flameout protection device is installed on the gas appliance. There are currently two types of flameout protection devices, one is a thermocouple flameout protection device, and the other is an ion sensing flameout protection device. Because the thermocouple flameout protection device is more suitable for open environment combustion, existing gas appliances generally choose thermocouple flameout protection devices. The thermocouple flameout protection device includes a thermocouple and a solenoid valve. The thermocouple is installed at the burner head, with one end close to the burner head combustion. The solenoid valve is installed on the valve body of the plug valve. The valve stem of the solenoid valve is provided with a plug, and the thermocouple is electrically connected to the solenoid valve. When the burner is burning normally, one end of the thermocouple is heated and generates a temperature differential voltage. The temperature differential voltage supplies power to the solenoid valve, which absorbs the valve stem, lifts the blockage, and connects the air inlet and outlet of the valve body. When the flame of the burner is accidentally extinguished, the temperature differential voltage disappears, the solenoid valve is de-energized, and the valve stem is reset by the spring inside the solenoid valve. The blockage is pushed out to block the gas passage, thereby cutting off the gas supply.

[0004] The existing gas plug valve manufacturing belongs to foreign (Italy, Germany) processing technology, the process is complicated, domestic manufacturing has great limitations, the manufacturing cost is high, especially the processing of the outer wall cone of the valve core and the inner cone of the valve body, which has extremely high requirements for the processing machine tools, resulting in a high scrap rate, and the plug valve is only suitable for low-pressure gas environment, cannot meet the use requirements of high and medium pressure gas, and has a small scope of application. The durability performance test of the plug valve shows that the limit is 100,000 switches, and the service life is not long enough. When the aperture of the valve core outlet hole is required to be equal to 12mm or a larger flow rate is required, the valve body aperture and outer diameter of the plug valve need to be increased, and the outer diameter of the valve core is also increased, resulting in excessive friction on the cone surface, and the torque of the plug valve is too large to be within the torque value specified by the national standard, resulting in it being unusable. In addition, the plug valve needs to be connected to an external long-fire, large and small fire pipelines, and a regulating valve must be connected to the long-fire and large and small fire pipelines. The structure is not compact, the volume is large, and it is not convenient for installation and layout. Summary of the invention

[0005] The purpose of the present invention is to provide a gas valve with compact structure, good applicability and long service life in view of the above problems existing in the prior art.

[0006] The objective of the present invention can be achieved through the following technical scheme: a gas valve comprises a valve body, wherein the valve body is provided with a valve cavity, the valve body has an air inlet end and a large and small fire air outlet end both connected to the valve cavity, a valve core is arranged in the valve cavity, and the valve core is characterized in that the valve core is spherical and the outer end of the valve core is connected to a valve stem portion, the inner end of the valve core is provided with an axially recessed air vent connected to the air inlet end, the valve body is provided with a sealing ring for sealing the outer and inner ends of the valve core, a first gas hole and a second gas hole connected to the air vent are radially arranged in the middle of the valve core, the aperture of the first gas hole is larger than the aperture of the second gas hole and the angle between the first gas hole and the second gas hole is 90-120°, the valve cavity between the left side of the valve core and the valve body is a left sealing cavity, the valve cavity between the bottom of the valve core and the valve body is a bottom sealing cavity, the right side of the valve core and The valve cavity between the valve bodies is a ventilation cavity, the large and small fire air outlet ends are located at the top of the valve body and the valve body is provided with a large fire air passage connecting the top of the valve core and the large and small fire air outlet ends, the valve body is provided with a small fire air passage connecting the large and small fire air outlet ends and the ventilation cavity, the aperture of the large fire air passage is larger than the aperture of the small fire air passage, a long-fire air outlet end is provided at the top of the valve body and the valve body is provided with a long-fire air passage connecting the long-fire air outlet end and the ventilation cavity, when the gas valve is in the closed position, the first gas hole is sealed by the bottom sealing cavity and the second gas hole is sealed by the left sealing cavity, when the gas valve is in the long-fire and small-fire gas supply, the first gas hole is connected to the ventilation cavity and the second gas hole is sealed by the bottom sealing cavity, when the gas valve is in the small fire, large fire and long-fire gas supply, the first gas hole is connected to the large fire air passage and the second gas hole is connected to the ventilation cavity.

[0007] In the above-mentioned gas valve, the valve core is radially provided with a third gas hole connected to the vent hole, the third gas hole is arranged close to the first gas hole and the first gas hole is located between the third gas hole and the second gas hole, the aperture of the third gas hole is smaller than the aperture of the first gas hole, and when the gas valve is in the closed position, the third gas hole is sealed by the bottom sealing cavity.

[0008] In the above-mentioned gas valve, the valve stem and the valve core are an integrated structure, the valve stem extends out of the valve body, a sealing ring is embedded in the outer wall of the valve stem near the outer end of the valve core and sealed to the inner wall of the valve body, the inner end of the valve core has an axially extended cylindrical portion, and another sealing ring is embedded in the outer wall of the cylindrical portion and sealed to the inner wall of the valve body.

[0009] In the above-mentioned gas valve, a high fire adjusting screw radially passing through the high fire air passage is bolted to the valve body, an O-ring sealed to the valve body is embedded in the head of the high fire adjusting screw, and the inner end of the high fire adjusting screw is close to the inner ends of the high and low fire outlet ends.

[0010] In the above-mentioned gas valve, the low-fire ventilation passage includes low-fire ventilation hole one, low-fire ventilation hole two and low-fire ventilation hole three. The low-fire ventilation hole one runs through the top of the valve body to the ventilation cavity and a sealing member for sealing the outer end of the low-fire ventilation hole one is fixedly connected to the top of the valve body. The low-fire ventilation hole two is located in the valve body and connected to the low-fire ventilation hole one. The inner end of the low-fire ventilation hole three is connected to the low-fire ventilation hole two, and the outer end of the low-fire ventilation hole three is connected to the large and small fire outlet ends. The valve body is threadedly connected with a low-fire adjusting screw, and the head of the low-fire adjusting screw is embedded with an O-ring two that is sealed to the valve body. The inner end of the low-fire adjusting screw is located at the inner end of the low-fire ventilation hole three.

[0011] In the above-mentioned gas valve, the pilot flame vent includes a pilot flame vent hole 1 and a pilot flame vent hole 2. The pilot flame vent hole 1 runs through the top of the valve body to the ventilation cavity and a sealing member for sealing the outer end of the pilot flame vent hole 1 is fixedly connected to the top of the valve body. The inner end of the pilot flame vent hole 2 is connected to the pilot flame vent hole 1, and the outer end of the pilot flame vent hole 2 is connected to the pilot flame outlet end. The valve body is threadedly connected with a pilot flame adjusting screw, and the head of the pilot flame adjusting screw is embedded with an O-ring 3 that is sealed to the valve body. The inner end of the pilot flame adjusting screw is located at the inner end of the pilot flame vent hole 2.

[0012] In the above-mentioned gas valve, the high-fire adjusting screw, the low-fire adjusting screw and the long-fire adjusting screw are arranged in parallel and their heads are all facing the end of the valve body through which the valve stem is arranged.

[0013] In the above-mentioned gas valve, the valve body is provided with an electromagnetic valve in the axial extension direction of the inner end of the valve core, the electromagnetic valve has a valve stem extending toward the valve core side, the end of the valve stem is a radially outwardly protruding sealing portion, a spring is sleeved on the valve stem, the inner wall of the valve body has a shoulder located between the valve core and the sealing portion, the center of the shoulder is an air hole, the air inlet end is connected to the chamber of the valve body for installing the electromagnetic valve, the spring provides elastic force so that the sealing portion blocks the air hole, a push rod axially passes through the valve stem portion and the inner end of the push rod is located in the valve core, and the valve stem portion is provided with a driving mechanism which drives the push rod to touch the sealing portion when the valve stem portion rotates and provides a reset force for the push rod.

[0014] In the above-mentioned gas valve, the driving mechanism includes a driving disk and a second spring which are sleeved on the valve stem portion, the second spring is located between the driving disk and the valve body, the outer wall of the driving disk has a protrusion or groove for circumferential limiting, the push rod is fixedly connected to the driving disk, a limiting rod is radially penetrated on the valve stem portion, the end face of the driving disk facing the limiting rod has a mirror-symmetrical limiting groove, one side wall of the limiting groove is an inclined surface for the limiting rod to slide, and the second spring provides elastic force so that the limiting groove is located in the limiting groove.

[0015] In the above-mentioned gas valve, the left side of the valve body is threadedly connected to plug 1, plug 1 is embedded with a left sealing ring sealed on the left side of the valve core, the bottom of the valve body is threadedly connected to plug 2, plug 2 is embedded with a bottom sealing ring sealed on the bottom of the valve core, the inner end of the high-fire airway is threadedly connected to a hollow plug cap, the plug cap is embedded with a top sealing ring sealed on the top of the valve core, and the valve body is threadedly connected to a valve cover that closes the outer end of the high-fire airway. This structure is compact, the left sealing chamber and the bottom sealing chamber are easy to manufacture, and it is also convenient for the valve core to assemble, the sealing performance is good everywhere, and the valve core rotates smoothly. In order to achieve good sealing performance, plug 1 and plug 2 are both embedded with sealing rings sealed on the valve body.

[0016] Compared with the prior art, the gas valve has a compact overall structure, good integration, small size, and is easy to install and arrange. The spherical valve core is easy to process and has a low manufacturing cost. The spherical valve core makes the gas valve suitable not only for low-pressure gas environments, but also for medium and high-pressure gas environments. It has good applicability, can adjust the long-open flame and large and small flames, saves energy and reduces consumption, and is easy to use. The gas valve has a long service life. When the vent diameter at the valve core is required to be equal to 12mm or a larger flow rate is required, the increase in the valve core size will not cause the torque to increase linearly and rapidly. The torque of the valve core is still within the torque value specified by the national standard, and it has a wide range of applications. In addition, the gas valve can be adapted to general mechanical electronic piezoelectric ignition or pulse ignition driven by a microswitch, and is also adapted to existing push knob switches or linear knob switches, with good adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the gas valve.

[0018] Figure 2 It is a structural sectional view of the gas valve.

[0019] Figure 3 It is a top view of the structure of the gas valve.

[0020] Figure 4 yes Figure 3 Structural cross-sectional view of section AA.

[0021] Figure 5It is a structural cross-sectional view of the gas valve longitudinally cut along the axis of the long-open flame vent hole.

[0022] Figure 6 It is a structural cross-sectional view of the gas valve cut transversely along the second axis of the long-fire vent hole.

[0023] Figure 7 It is a three-dimensional structural diagram of the valve core in this gas valve.

[0024] Figure 8 It is a structural cross-sectional view of the gas valve when it is closed.

[0025] Fig. 9 It is a structural cross-sectional view of the gas valve when it is in the state of long-fire and low-fire gas supply.

[0026] Fig.10 It is a structural cross-sectional view of the gas valve when it is in low fire, high fire and long-open fire gas supply.

[0027] In the figure, 1, valve body; 2, air inlet end; 3, large and small fire outlet ends; 4, valve core; 5, valve stem; 6, vent hole; 7, sealing ring; 8, first gas hole; 9, second gas hole; 10, ventilation cavity; 11, high fire vent passage; 12, low fire vent passage; 121, low fire vent hole 1; 122, low fire vent hole 2; 123, low fire vent hole 3; 13, long fire outlet end; 14, long fire vent passage; 141, long fire vent hole 1; 142, long fire vent hole 2; 15, third gas hole; 16, cylindrical part; 17, high fire adjustment screw ;18. O-ring one;19. low-fire adjustment screw;20. O-ring two;21. long-fire adjustment screw;22. O-ring three;23. solenoid valve;231. valve stem;232. sealing part;24. spring one;25. shoulder;26. air hole;27. push rod;28. driving plate;281. bump;29. spring two;30. limit rod;31. limit groove;311. inclined surface;32. plug one;33. left sealing ring;34. plug two;35. bottom sealing ring;36. plug cap;37. top sealing ring;38. valve cover. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the gas valve comprises a valve body 1, wherein the valve body 1 has a valve cavity, the valve body 1 has an air inlet end 2 and a large and small fire air outlet end 3 both connected to the valve cavity, a valve core 4 is arranged in the valve cavity, the valve core 4 is spherical and the outer end of the valve core 4 is connected to a valve stem 5, the inner end of the valve core 4 is provided with an axially recessed air vent 6 connected to the air inlet end 2, a sealing ring 7 is arranged in the valve body 1 for sealing the outer and inner ends of the valve core 4, a first gas hole 8 and a second gas hole 9 connected to the air vent 6 are radially arranged in the middle of the valve core 4, the aperture of the first gas hole 8 is larger than the aperture of the second gas hole 9 and the angle between the first gas hole 8 and the second gas hole 9 is 90-120°, the left side and the valve core 4 The valve cavity between the valve bodies 1 is a left sealing cavity, the valve cavity between the bottom of the valve core 4 and the valve body 1 is a bottom sealing cavity, and the valve cavity between the right side of the valve core 4 and the valve body 1 is a ventilation cavity 10. In this embodiment, the left side of the valve body 1 is threadedly connected to a plug 1 32, and the plug 1 32 is embedded with a left sealing ring 33 sealed on the left side of the valve core 4. The bottom of the valve body 1 is threadedly connected to a plug 2 34, and the plug 2 34 is embedded with a bottom sealing ring 35 sealed on the bottom of the valve core 4. The inner end of the high-fire ventilation channel 11 is threadedly connected to a hollow plug cap 36, and the plug cap 36 is embedded with a top sealing ring 37 sealed on the top of the valve core 4. The valve body 1 is threadedly connected to a valve cover 38 that closes the outer end of the high-fire ventilation channel 11. The large and small fire outlet ends 3 are located at the top of the valve body 1 and the valve body 1 is provided with a large fire air passage 11 connecting the top of the valve core 4 and the large and small fire outlet ends 3, the valve body 1 is provided with a small fire air passage 12 connecting the large and small fire outlet ends 3 and the ventilation cavity 10, the aperture of the large fire air passage 11 is larger than the aperture of the small fire air passage 12, the top of the valve body 1 is provided with a long-fire air outlet end 13 and the valve body 1 is provided with a long-fire air passage 14 connecting the long-fire air outlet end 13 and the ventilation cavity 10, when the gas valve is in the closed position, the first gas hole 8 is sealed by the bottom sealing cavity and the second gas hole 9 is sealed by the left sealing cavity, when the gas valve is in the long-fire and small-fire gas supply, the first gas hole 8 is connected to the ventilation cavity 10 and the second gas hole 9 is sealed by the bottom sealing cavity, when the gas valve is in the high fire and long-fire gas supply, the first gas hole 8 is connected to the large fire air passage 11 and the second gas hole 9 is connected to the ventilation cavity 10.

[0030] The valve core 4 in the gas valve plays a blocking role, and the high-fire ventilation channel 11 is not connected to the ventilation cavity 10. In the present embodiment, the angle between the first gas hole 8 and the second gas hole 9 is 100°. Of course, according to actual manufacturing requirements, the angle between the first gas hole 8 and the second gas hole 9 can be selected from 90-120°. The gas valve drives the valve core 4 to rotate by rotating the valve stem 5, thereby changing the radial positions of the first gas hole 8 and the second gas hole 9, realizing the fire intensity adjustment of the long-open flame and the large and small flames, and the overall structure is compact and well integrated. , small size, easy to install and arrange, and the spherical valve core 4 is easy to process and has low manufacturing cost. The spherical valve core 4 is not only suitable for low-pressure gas environment, but also for medium and high-pressure gas environment, with good applicability. The durability test of this gas valve has a limit of 300,000 switches and a long service life. When the diameter of the vent hole 6 at the valve core 4 is required to be equal to 12mm or a larger flow rate is required, the increase in the size of the valve core 4 will not cause the torque to increase linearly and rapidly, and the torque of the valve core 4 is still within the torque value specified by the national standard, with a wide range of applications.

[0031] During the use of this gas valve, if Figure 8 As shown, when the gas valve is in the closed position, the first gas hole 8 is sealed by the bottom sealing cavity and the second gas hole 9 is sealed by the left sealing cavity, the gas enters from the gas inlet end 2 and flows to the vent hole 6, the valve core 4 plays a blocking role, and the long-fire gas outlet end 13 and the large and small fire gas outlet ends 3 cannot supply gas; Fig. 9 As shown, the valve stem 5 drives the valve core 4 to rotate counterclockwise. When the gas valve is in the state of long-fire and low-fire gas supply, the first gas hole 8 is connected to the ventilation cavity 10 and the second gas hole 9 is sealed by the bottom sealing cavity. The gas at the air inlet end 2 flows through the ventilation hole 6 and flows from the first gas hole 8 to the ventilation cavity 10, and then the gas enters the low-fire air passage 12 and the long-fire air passage 14. The gas in the low-fire air passage 12 flows out from the large and small fire outlet ends 3 for use with the low fire, and the gas in the long-fire air passage 14 flows out from the long-fire outlet end 13 for use with the long-fire; the valve stem 5 continues to drive the valve core 4 to rotate counterclockwise. Because the aperture of the first gas hole 8 is relatively large, the first gas hole 8 plays a transitional role. The first gas hole 8 is connected to the ventilation cavity 10 and the high-fire air passage 11 at the same time. When the second gas hole 9 is not connected to the ventilation cavity 10, the first gas hole 8 is always connected to the ventilation cavity 10 to ensure that the long-fire is always on; as shown in FIG. Fig.10As shown, when the gas valve is in the high fire and long-fire gas supply, the first gas hole 8 is connected to the high fire air passage 11 and the second gas hole 9 is connected to the ventilation cavity 10, the gas entering the air inlet end 2 enters the first gas hole 8 from the ventilation hole 6, and then flows out from the high fire air passage 11 to the large and small fire outlet ends 3 for use in the high fire, the gas flowing out of the second gas hole 9 enters the small fire air passage 12 and the long-fire air passage 14 from the ventilation cavity 10, the gas in the small fire air passage 12 flows out from the large and small fire outlet ends 3 for use in the small fire, and the gas in the long-fire air passage 14 flows out from the long-fire outlet end 13 for use in the long-fire.

[0032] To further elaborate, the valve core 4 is radially provided with a third gas hole 15 connected to the vent hole 6. The third gas hole 15 is arranged close to the first gas hole 8 and the first gas hole 8 is located between the third gas hole 15 and the second gas hole 9. The aperture of the third gas hole 15 is smaller than the aperture of the first gas hole 8. When the gas valve is in the closed position, the third gas hole 15 is sealed by the bottom sealing cavity. During use, the rotation of the valve core 4 will make the third gas hole 15 first connect to the vent cavity 10, shortening the gas stroke. The gas supply of the third gas hole 15 makes the long flame and the small flame burn quickly, improving the efficiency; continue to rotate the valve core 4, so that the third gas hole 15 rotates through the vent cavity 10, and the third gas hole 15 is connected to the large fire vent 11, improving the combustion efficiency of the large fire, and the fire of the large fire gradually increases as the third gas hole 15 and the first gas hole 8 are gradually connected to the large fire vent 11. In this way, the adjustment range of the large fire is large, which is convenient for users to select the appropriate flame size and is convenient to use. In order to ensure smooth ventilation and improve regulation accuracy, the outer end opening of the third gas hole 15 is expanded.

[0033] like Figure 7 As shown, the valve stem 5 and the valve core 4 are an integrated structure, the valve stem 5 extends out of the valve body 1, a sealing ring 7 is embedded in the outer wall of the valve stem 5 near the outer end of the valve core 4 and is sealed to the inner wall of the valve body 1, the inner end of the valve core 4 has an axially extended cylindrical portion 16, another sealing ring 7 is embedded in the outer wall of the cylindrical portion 16 and is sealed to the inner wall of the valve body 1. This structure is compact and easy to manufacture. The valve stem 5, the valve core 4 and the two sealing rings 7 form a component, which is easy to assemble, and the valve stem 5 extends out of the valve body 1 for knob switch connection.

[0034] The valve body 1 is bolted with a high-fire adjustment screw 17 that radially passes through the high-fire air passage 11. The head of the high-fire adjustment screw 17 is embedded with an O-ring 18 that is sealed to the valve body 1. The inner end of the high-fire adjustment screw 17 is close to the inner end of the large and small fire outlet ends 3. By rotating the high-fire adjustment screw 17, the high-fire adjustment screw 17 is axially displaced, thereby changing the distance between the inner end of the high-fire adjustment screw 17 and the inner end of the large and small fire outlet ends 3, so as to achieve the purpose of adjusting the gas flow rate of the high-fire air passage 11 entering the large and small fire outlet ends 3. The structure is compact and the adjustment is convenient.

[0035] The low-fire air duct 12 comprises a low-fire air vent 121, a low-fire air vent 122 and a low-fire air vent 3 123. The low-fire air vent 121 passes through from the top of the valve body 1 to the ventilation cavity 10 and a sealing member for sealing the outer end of the low-fire air vent 121 is fixedly connected to the top of the valve body 1. The low-fire air vent 122 is located in the valve body 1 and is connected to the low-fire air vent 1 121. The inner end of the low-fire air vent 123 is connected to the low-fire air vent 122. The outer end of the low-fire air vent 123 is connected to the high and low-fire air outlet ends 3. The valve body 1 is threadedly connected with a low-fire adjusting screw 19. The head of the low-fire adjusting screw 19 is embedded with an O-ring 2 20 sealed to the valve body 1. The inner end of the low-fire adjusting screw 19 is located at the inner end of the low-fire air vent 3 123. By rotating the low-fire adjusting screw 19, the low-fire adjusting screw 19 is axially displaced, thereby changing the opening size of the inner end of the low-fire adjusting screw 19 sealed at the inner end of the low-fire vent hole 3 123, thereby achieving the purpose of adjusting the gas flow size of the low-fire vent 12 entering the large and small fire outlet ends 3. The structure is compact and the adjustment is convenient.

[0036] The ever-burning flame air passage 14 includes an ever-burning flame air vent 141 and an ever-burning flame air vent 2 142. The ever-burning flame air vent 141 passes through the top of the valve body 1 to the ventilation cavity 10, and a sealing member for sealing the outer end of the ever-burning flame air vent 141 is fixedly connected to the top of the valve body 1. The inner end of the ever-burning flame air vent 142 is connected to the ever-burning flame air vent 141, and the outer end of the ever-burning flame air vent 142 is connected to the ever-burning flame outlet end 13. The valve body 1 is threadedly connected with a ever-burning flame adjusting screw 21, and the head of the ever-burning flame adjusting screw 21 is embedded with an O-ring 3 22 sealed to the valve body 1. The inner end of the ever-burning flame adjusting screw 21 is located at the inner end of the ever-burning flame vent 2 142. By rotating the pilot flame adjusting screw 21, the pilot flame adjusting screw 21 is axially displaced, thereby changing the opening size of the pilot flame vent hole 141 blocked by the inner end of the pilot flame adjusting screw 21, so as to adjust the gas flow size of the pilot flame vent 14 entering the pilot flame outlet 13, with a compact structure and convenient adjustment. In this embodiment, the blocking member is a steel ball, and the blocking member can be a plug in actual manufacturing.

[0037] In this embodiment, the high fire adjustment screw 17, the low fire adjustment screw 19 and the long-fire adjustment screw 21 are arranged in parallel and the heads of the three are all facing the end of the valve body 1 for the valve stem portion 5 to pass through. The high fire adjustment screw 17, the low fire adjustment screw 19 and the long-fire adjustment screw 21 arranged on the same side are convenient for observation and adjustment.

[0038] The valve body 1 is provided with a solenoid valve 23 in the axial extension direction of the inner end of the valve core 4. The solenoid valve 23 has a valve stem 231 extending toward the side of the valve core 4. The end of the valve stem 231 is a radially outwardly protruding sealing portion 232. A spring 24 is sleeved on the valve stem 231. The inner wall of the valve body 1 has a shoulder 25 located between the valve core 4 and the sealing portion 232. The center of the shoulder 25 is an air hole 26. The air inlet end 2 is connected to the chamber of the valve body 1 for installing the solenoid valve 23. The spring 24 provides elastic force so that the sealing portion 232 blocks the air hole 26. A push rod 27 axially passes through the valve stem portion 5 and the inner end of the push rod 27 is located in the valve core 4. The valve stem portion 5 is provided with a driving mechanism that drives the push rod 27 to touch the sealing portion 232 when the valve stem portion 5 rotates and provides a reset force for the push rod 27. Such an arrangement makes the structure compact and small in size. The solenoid valve 23 is used to connect with the thermocouple, so that the gas valve has a flameout protection function, that is, when the valve stem 5 rotates, the driving mechanism causes the push rod 27 to touch the blocking portion 232, and the flame of the gas appliance causes the thermocouple to be heated. The generated temperature difference voltage causes the solenoid valve 23 to overcome the elastic force of the spring 24 and absorb the blocking portion 232. The air inlet end 2 is connected to the air vent 6 of the valve core 4 through the air hole 26. After use, the driving mechanism causes the push rod 27 to reset. During use, when the flame of the gas appliance is extinguished, the temperature difference voltage disappears, the solenoid valve 23 is powered off, and the spring 24 causes the blocking portion 232 to contact the shoulder 25 again to block the air hole 26, cut off the gas supply, and ensure safety in use.

[0039] The driving mechanism includes a driving disk 28 and a spring 29 which are sleeved on the valve stem portion 5. The spring 29 is located between the driving disk 28 and the valve body 1. The outer wall of the driving disk 28 has a protrusion 281 or a groove for circumferential limiting. The push rod 27 is fixedly connected to the driving disk 28. A limiting rod 30 is radially penetrated on the valve stem portion 5. The end face of the driving disk 28 facing the limiting rod 30 has a mirror-symmetrical limiting groove 31. The groove wall on one side of the limiting groove 31 is an inclined surface 311 for the limiting rod 30 to slide. The spring 29 provides elastic force so that the limiting groove 31 is located in the limiting groove 31. In this embodiment, the outer wall of the driving disk 28 is a protrusion 281, and the driving disk 28 is limited circumferentially at the housing of the knob switch. When in use, the valve stem portion 5 is driven by the knob switch to rotate counterclockwise, and the limit rod 30 is pressed on the inclined surface 311, so that the driving disk 28 is displaced toward the valve body 1 side, and the driving disk 28 drives the push rod 27 to touch the blocking portion 232 to allow air to enter. After use, the valve stem portion 5 drives the limit rod 30 to reset, and the spring 29 provides elastic force to make the limit rod 30 re-positioned at the bottom of the limit groove 31.

[0040] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in the field. The specific embodiments described herein are merely examples of the spirit of the present invention. The technical personnel in the technical field to which the present invention belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, but they will not deviate from the spirit of the present invention or exceed the scope defined by the attached claims.

Claims

1. A gas valve, comprising a valve body (1), wherein the valve body (1) has a valve cavity, wherein the valve body (1) has an air inlet end (2) and a large and small fire air outlet end (3) both of which are connected to the valve cavity, and wherein a valve core (4) is provided in the valve cavity, characterized in that: The valve core (4) is spherical and the outer end of the valve core (4) is connected to the valve stem (5). The inner end of the valve core (4) is provided with an axially recessed vent hole (6) connected to the air inlet end (2). The valve body (1) is provided with a sealing ring (7) for sealing the outer and inner ends of the valve core (4). The middle part of the valve core (4) is radially provided with a first gas hole (8) and a second gas hole (9) connected to the vent hole (6). The diameter of the first gas hole (8) is larger than that of the second gas hole (9). The aperture is 90-120 degrees, and the angle between the first gas hole (8) and the second gas hole (9) is 90-120 degrees. The valve cavity between the left side of the valve core (4) and the valve body (1) is a left sealing cavity, the valve cavity between the bottom of the valve core (4) and the valve body (1) is a bottom sealing cavity, and the valve cavity between the right side of the valve core (4) and the valve body (1) is a ventilation cavity (10). The large and small fire outlet ends (3) are located at the top of the valve body (1) and the valve body (1) has a connecting portion connecting the top of the valve core (4) and the large fire outlet end (3). The valve body (1) is provided with a high-fire air passage (11) at the low-fire air outlet (3), a low-fire air passage (12) communicating with the high-fire air outlet (3) and the air vent (10), the aperture of the high-fire air passage (11) is larger than the aperture of the low-fire air passage (12), a long-fire air outlet (13) is provided at the top of the valve body (1), and a long-fire air passage (14) communicating with the long-fire air outlet (13) and the air vent (10) is provided in the valve body (1). When the gas valve is in the closed position When the gas valve is in the state of long-fire and low-fire gas supply, the first gas hole (8) is connected to the ventilation cavity (10) and the second gas hole (9) is sealed by the bottom sealing cavity. When the gas valve is in the state of low-fire, high-fire and long-fire gas supply, the first gas hole (8) is connected to the high-fire ventilation duct (11) and the second gas hole (9) is connected to the ventilation cavity (10).

2. A gas valve according to claim 1, characterized in that: The valve core (4) is radially provided with a third gas hole (15) connected to the vent hole (6). The third gas hole (15) is arranged close to the first gas hole (8) and the first gas hole (8) is located between the third gas hole (15) and the second gas hole (9). The aperture of the third gas hole (15) is smaller than the aperture of the first gas hole (8). When the gas valve is in the closed position, the third gas hole (15) is sealed by the bottom sealing cavity.

3. A gas valve according to claim 1 or 2, characterized in that: The valve stem (5) and the valve core (4) are an integrated structure. The valve stem (5) extends out of the valve body (1). A sealing ring (7) is embedded in the outer wall of the valve stem (5) near the outer end of the valve core (4) and is sealed to the inner wall of the valve body (1). The inner end of the valve core (4) has an axially extended cylindrical portion (16). Another sealing ring (7) is embedded in the outer wall of the cylindrical portion (16) and is sealed to the inner wall of the valve body (1).

4. A gas valve according to claim 3, characterized in that: The valve body (1) is bolted with a high-fire adjusting screw (17) that radially passes through the high-fire air passage (11). The head of the high-fire adjusting screw (17) is embedded with an O-ring (18) that is sealed to the valve body (1). The inner end of the high-fire adjusting screw (17) is close to the inner end of the large and small fire outlet ends (3).

5. A gas valve according to claim 4, characterized in that: The low-fire vent (12) includes a low-fire vent hole 1 (121), a low-fire vent hole 2 (122) and a low-fire vent hole 3 (123). The low-fire vent hole 1 (121) passes through the top of the valve body (1) to the vent cavity (10), and a blocking member for blocking the outer end of the low-fire vent hole 1 (121) is fixedly connected to the top of the valve body (1). The low-fire vent hole 2 (122) is located in the valve body (1) and is connected to the low-fire vent hole 1 (121). ), the inner end of the small fire vent hole three (123) is connected to the small fire vent hole two (122), and the outer end of the small fire vent hole three (123) is connected to the large and small fire outlet ends (3), and the valve body (1) is threadedly connected with a small fire adjusting screw (19), and the head of the small fire adjusting screw (19) is embedded with an O-ring two (20) sealed to the valve body (1), and the inner end of the small fire adjusting screw (19) is located at the inner end of the small fire vent hole three (123).

6. A gas valve according to claim 5, characterized in that: The described long-fire vent passage (14) includes a long-fire vent hole 1 (141) and a long-fire vent hole 2 (142), the long-fire vent hole 1 (141) passes through the top of the valve body (1) to the ventilation cavity (10), and the top of the valve body (1) is fixedly connected with a blocking member for blocking the outer end of the long-fire vent hole 1 (141), the inner end of the long-fire vent hole 2 (142) is connected to the long-fire vent hole 1 (141), and the outer end of the long-fire vent hole 2 (142) is connected to the long-fire outlet end (13), the valve body (1) is threadedly connected with a long-fire adjusting screw (21), the head of the long-fire adjusting screw (21) is embedded with an O-ring 3 (22) sealed to the valve body (1), and the inner end of the long-fire adjusting screw (21) is located at the inner end of the long-fire vent hole 2 (142).

7. A gas valve according to claim 6, characterized in that: The high fire adjustment screw (17), low fire adjustment screw (19) and long fire adjustment screw (21) are arranged in parallel and the heads of the three are all facing the end of the valve body (1) for the valve stem (5) to pass through.

8. A gas valve according to claim 1 or 2, characterized in that: The valve body (1) is provided with a solenoid valve (23) in the axial extension direction of the inner end of the valve core (4), and the solenoid valve (23) has a valve stem (231) extending toward the side of the valve core (4). The end of the valve stem (231) is a radially outwardly protruding blocking portion (232). A spring (24) is sleeved on the valve stem (231). The inner wall of the valve body (1) has a shoulder (25) located between the valve core (4) and the blocking portion (232), and the center of the shoulder (25) is an air hole (26). The air inlet end (2) is connected to the chamber of the valve body (1) for installing the electromagnetic valve (23), the spring (24) provides elastic force so that the sealing portion (232) blocks the air hole (26), a push rod (27) axially passes through the valve stem portion (5) and the inner end of the push rod (27) is located in the valve core (4), and the valve stem portion (5) is provided with a driving mechanism that drives the push rod (27) to touch the sealing portion (232) when the valve stem portion (5) rotates and provides a reset force for the push rod (27).

9. A gas valve according to claim 8, characterized in that: The driving mechanism includes a driving disk (28) and a second spring (29) provided on the valve stem portion (5), the second spring (29) being located between the driving disk (28) and the valve body (1), the outer wall of the driving disk (28) having a protrusion (281) or a groove for circumferential limiting, the push rod (27) being fixedly connected to the driving disk (28), the valve stem portion (5) being radially penetrated by a limiting rod (30), the end face of the driving disk (28) facing the limiting rod (30) having a mirror-symmetrical limiting groove (31), a groove wall on one side of the limiting groove (31) being an inclined surface (311) for the limiting rod (30) to slide, and the second spring (29) providing elastic force so that the limiting groove (31) is located in the limiting groove (31).

10. A gas valve according to claim 1 or 2, characterized in that: The left side of the valve body (1) is threadedly connected to a plug 1 (32), and the plug 1 (32) is embedded with a left sealing ring (33) that seals the left side of the valve core (4). The bottom of the valve body (1) is threadedly connected to a plug 2 (34), and the plug 2 (34) is embedded with a bottom sealing ring (35) that seals the bottom of the valve core (4). The inner end of the high-fire vent (11) is threadedly connected to a hollow plug cap (36), and the plug cap (36) is embedded with a top sealing ring (37) that seals the top of the valve core (4). The valve body (1) is threadedly connected to a valve cover (38) that closes the outer end of the high-fire vent (11).

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