Gas valve and gas control system

Abstract

A gas valve, comprising: a valve body (11), a first valve group (12), and a second valve group (13). The valve body has a first gas supply path and a second gas supply path. The first gas supply path is provided with a first valve port portion (114), and the second gas supply path is provided with the first valve port portion and a second valve port portion (115). The first valve group comprises a first differential pressure main valve (12A) and a first pilot valve (12B). The first pilot valve is used for adjusting the pressure of a first back pressure chamber (1211) of the first differential pressure main valve, so as to control the first differential pressure main valve to open or close the first valve port portion. The first pilot valve can be manually opened, and when the first pilot valve is in an energized state, the first differential pressure main valve can be kept at a position for opening the first valve port portion. The second valve group comprises a second differential pressure main valve (13A) and a second pilot valve (13B). The second pilot valve is used for adjusting the pressure of a second back pressure chamber (1321) of the second differential pressure main valve, so as to control the second differential pressure main valve to open or close the second valve port portion. The gas valve has a small number of valves, which helps improve reliability. Further comprised is a gas control system.

Description

A gas valve and gas control system

[0001] This application claims priority to Chinese Patent Application No. 202411961457.9, filed on December 27, 2024, entitled "A Gas Valve and Gas Control System", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of gas control technology, and in particular to a gas valve and a gas control system. Background Technology

[0003] The electronic intelligent gas valve is equipped with a constant flame valve at the valve body inlet to control the constant flame burner of the gas valve for combustion, so that the flame of the constant flame burner can be used to ignite the main furnace burner as needed.

[0004] In related technologies, the constant flame valve of an electronic intelligent gas valve is controlled by at least a mechanical valve, a main valve, and a pilot valve that works in conjunction with the main valve. The number of valves is large and the structure is complex, which affects the reliability of the gas valve's operation. Summary of the Invention

[0005] The purpose of this application is to provide a gas valve and a gas control system. The gas valve can reduce the number of valves through structural improvements, which is beneficial to improving the reliability of the gas valve operation.

[0006] To solve the above-mentioned technical problems, this application provides a gas valve, including a valve body, a first valve group, and a second valve group;

[0007] The valve body has a first air supply path and a second air supply path. The first air supply path is provided with a first valve port, and the second air supply path is provided with a first valve port and a second valve port.

[0008] The first valve assembly includes a first differential pressure main valve and a first pilot valve. The first pilot valve is used to adjust the pressure of the first back pressure chamber of the first differential pressure main valve to control the opening or closing of the first valve port of the first differential pressure main valve. The first pilot valve can be manually opened and, when energized, can keep the first differential pressure main valve in the position where the first valve port is open.

[0009] The second valve group includes a second differential pressure main valve and a second pilot valve. The second pilot valve is used to adjust the pressure of the second back pressure chamber of the second differential pressure main valve to control the opening or closing of the second valve port of the second differential pressure main valve.

[0010] This application also provides a gas control system, including a gas valve, a thermoelectric stack, a constant flame burner, and a main furnace burner; the gas valve is any of the gas valves described above, the constant flame burner is connected to the first gas supply path, and the main furnace burner is connected to the second gas supply path; the constant flame burner is located beside the main furnace burner, the thermoelectric stack is disposed on the constant flame burner, and the thermoelectric stack is capable of supplying power to the first valve group.

[0011] The gas valve provided in this application can be used in a gas control system. The gas valve is configured such that the first valve port is located in both the first and second gas supply paths. The first pilot valve of the first valve group can be manually opened and, when energized, can be held in the position that opens the first valve port of the first differential pressure main valve. In this way, the gas supply path of the constant flame burner can be opened or closed through the first valve group. Compared with the prior art, which requires at least three valves to control the opening and closing of the gas supply path of the constant flame burner, the number of valves is reduced, and the reliability of the gas valve operation can be improved accordingly. Attached Figure Description

[0012] Figure 1 is a cross-sectional schematic diagram of the gas control system provided in an embodiment of this application;

[0013] Figure 2 is a cross-sectional schematic diagram of the gas valve shown in Figure 1;

[0014] Figure 3 is a partial enlarged view of the location of the first pilot valve of the first valve group in Figure 2.

[0015] Explanation of reference numerals in the attached drawings: Gas valve 10, electronic controller 20, thermopile 30, constant flame burner 40, main furnace burner 50, igniter 60, temperature sensor 70, water tank 80, knob 90, connecting rod 91, capillary tube 100; Valve body 11, air inlet channel 111, first throttling orifice 1111, first guide channel 1112, second guide channel 1113, first valve chamber 112, second valve chamber 113, air outlet 1131, first valve port 114, second valve port 115, first flow channel 116, second flow channel 117, third flow channel 118, connecting channel 119; First valve assembly 12, first differential pressure main valve 12A, first back pressure chamber 1211, first differential pressure diaphragm assembly 1212, first differential pressure elastic element 1213, first differential pressure valve plug 1214, first pilot valve 12B, first coil 1221, first stationary iron core 1222, first moving iron core 1223, first pilot valve plug 1224, first closing valve elastic element 1225, first pilot valve chamber 1226, first pilot valve port 1227; Second valve assembly 13, second differential pressure main valve 13A, second back pressure chamber 1321, second differential pressure diaphragm assembly 1322, second differential pressure elastic element 1323, second differential pressure valve plug 1324, second pilot valve 13B, pilot valve seat 133, second pilot valve chamber 1331, second throttling orifice 1332, second pilot valve port 1333, second coil 134, second stationary iron core 135, second moving iron core 136, second valve closing elastic element 137, second pilot valve plug 138; pressure regulating and stabilizing valve 14, constant open flame pressure stabilizing device 16. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present application, the specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0017] The directional terms "upper" (top), "lower" (bottom), etc., used in this document are defined based on the location of components in the accompanying drawings or their relative positions, and are merely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection of this application.

[0018] For ease of understanding and concise description, the following explanation will be combined with the gas valve and the gas control system with the gas valve, and the beneficial effects will not be discussed again.

[0019] Please refer to Figures 1 and 2. Figure 1 is a cross-sectional schematic diagram of a gas control system provided in an embodiment of this application; Figure 2 is a cross-sectional schematic diagram of the gas valve shown in Figure 1.

[0020] In this embodiment, the gas control system includes a gas valve 10, a thermopile 30, a constant flame burner 40, and a main furnace burner 50. The constant flame burner 40 is located beside the main furnace burner 50 so that the flame of the constant flame burner 40 can ignite the main furnace burner 50. The thermopile 30 is located next to the constant flame burner 40, and after the constant flame burner 40 is ignited, the thermopile 30 can be heated to generate electricity.

[0021] The gas valve 10 has a first gas supply path and a second gas supply path. When applied to the gas control system, the first gas supply path can be used to supply gas to the constant flame burner 40, and the second gas supply path can be used to supply gas to the main furnace burner 50. It can be understood that the constant flame burner 40 can only be ignited when gas is supplied to it, and the burning constant flame burner 40 can only ignite the main furnace burner 50 when gas is supplied to it.

[0022] The gas valve 10 has a first valve port 114 on its first gas supply path and a second valve port 115 on its second gas supply path. That is, the first valve port 114 is located in both the first and second gas supply paths, or in other words, the first and second gas supply paths have overlapping path portions, and the first valve port 114 is located in the overlapping path portion.

[0023] The gas valve 10 includes a first valve group 12 and a second valve group 13. The first valve group 12 is used to open or close the first valve port 114, and the second valve group 13 is used to open or close the second valve port 115. When the first valve group 12 is in the position of closing the first valve port 114, the first gas supply path is cut off, and gas cannot be delivered to the constant flame burner 40. When the first valve group 12 is in the position of opening the first valve port 114, the first gas supply path is opened, and gas can be delivered to the constant flame burner 40. When at least one of the first valve group 12 and the second valve group 13 is in the position of closing the corresponding valve port, the second gas supply path is cut off, and gas cannot be delivered to the main furnace burner 50. When both the first valve group 12 and the second valve group 13 are in the position of opening the corresponding valve ports, the second gas supply path is opened, and gas can be delivered to the main furnace burner 50.

[0024] The gas control system may also include an electronic controller 20, which can be used to control the on / off state of the power supply circuit of the first valve group 12 and the power supply circuit of the second valve group 13. The aforementioned thermopile 30 located in the constant flame burner 40 can be used to power the electronic controller 20, the first valve group 12, and the second valve group 13.

[0025] In the gas valve 10 provided in this embodiment, the first valve group 12 includes a first differential pressure main valve 12A and a first pilot valve 12B. The first pilot valve 12B is used to adjust the pressure of the first back pressure chamber 1211 of the first differential pressure main valve 12A to control the opening or closing of the first valve port 114 of the first differential pressure main valve 12A. The first pilot valve 12B can be manually opened and, when energized, the first pilot valve 12B can keep the first differential pressure main valve 12A in the position where the first valve port 114 is open.

[0026] With the above scheme, the first valve port 114 of the gas valve 10 is located in both the first gas supply path and the second gas supply path. The first pilot valve 12B of the first valve group 12 can be manually opened, and the first differential pressure main valve 12A can be kept in the position of opening the first valve port 114 when energized. In this way, the gas supply path of the constant flame burner 40 can be opened or closed by the cooperation of the first differential pressure main valve 12A and the first pilot valve 12B. Compared with the prior art, which requires at least three valves to control the opening and closing of the gas supply path of the constant flame burner 40, the number of valves is reduced, and the reliability of the gas valve 10 can be improved accordingly.

[0027] As shown in Figure 2, in this embodiment, the gas valve 10 includes a valve body 11, and at least a portion of the aforementioned first gas supply path and second gas supply path are formed on the valve body 11.

[0028] The valve body 11 has an air intake passage 111, a first valve chamber 112, a second valve chamber 113 and a first throttling orifice 1111; the gas valve 10 has a first flow guide passage 1112, a second flow guide passage 1113 and a first flow passage 116.

[0029] The intake passage 111 is connected to the first valve chamber 112 via the first valve port 114, and the first valve chamber 112 is connected to the second valve chamber 113 via the second valve port 115. The first flow passage 116 is connected to the first valve chamber 112.

[0030] The first throttling orifice 1111 is connected to the intake passage 111. The first throttling orifice 1111 can be located inside the intake passage 111. The first guide passage 1112 connects the first throttling orifice 1111 and the first back pressure chamber 1211 of the first differential pressure main valve 12A.

[0031] The first pilot valve 12B includes a first pilot valve port 1227 and a second flow channel 1113 connecting a first throttling orifice 1111 and a first valve chamber 112. The first pilot valve port 1227 is located in the second flow channel 1113. When the first pilot valve port 1227 of the first pilot valve 12B is closed, the second flow channel 1113 is blocked; when the first pilot valve port 1227 of the first pilot valve 12B is open, the second flow channel 1113 is opened.

[0032] When the gas valve 10 is applied to the gas control system, the first flow channel 116 can be used to communicate with the open flame burner 40; the gas outlet 1131 of the second valve chamber 113 can be used to communicate with the main furnace burner 50.

[0033] Referring to Figures 1 and 2, one end of the first flow channel 116 is connected to the first valve chamber 112, and the other end can be connected to the constant flame burner 40 through the capillary tube 100. The gas outlet 1131 of the second valve chamber 113 can be connected to the main furnace burner 50 through a gas pipeline.

[0034] Thus, the first gas supply path of the gas valve 10 includes an intake channel 111, a second flow channel 1113, a first valve chamber 112, and a first flow channel 116, and the second gas supply path includes an intake channel 111, a first valve chamber 112, and a second valve chamber 113.

[0035] Using the above scheme, after the first pilot valve port 1227 is opened, the gas flowing into the intake channel 111 can flow into the first valve chamber 112 through the first throttling orifice 1111 and the second guide channel 1113, and then flow to the constant flame burner 40 through the first flow channel 116 connected to the first valve chamber 112; after the first valve port 114 is opened, the gas flowing into the intake channel 111 can flow into the first valve chamber 112 through the first valve port 114, and then flow to the constant flame burner 40 through the first flow channel 116 connected to the first valve chamber 112.

[0036] In one implementation, the first differential pressure main valve 12A of the first valve group 12 is located in the intake passage 111. The first differential pressure main valve 12A includes the aforementioned first back pressure chamber 1211, as well as a first differential pressure diaphragm group 1212, a first differential pressure elastic element 1213, and a first differential pressure valve plug 1214. The first differential pressure diaphragm group 1212 can drive the first differential pressure valve plug 1214 to approach or move away from the first valve port 114 to close or open the first valve port 114.

[0037] As shown in Figure 2, the first differential pressure diaphragm assembly 1212 is located above the first valve port 114. Above the first differential pressure diaphragm assembly 1212 is the first back pressure chamber 1211. The first differential pressure diaphragm assembly 1212 is subjected to pressure from the intake passage 111 below and pressure from the first back pressure chamber 1211 above. By adjusting the pressure difference between the upper and lower sides of the first differential pressure diaphragm assembly 1212, the first differential pressure valve plug 1214 can be driven to close or open the first valve port 114. In the illustrated example, the first differential pressure valve plug 1214 is integrated onto the first differential pressure diaphragm assembly 1212. A first differential pressure elastic element 1213 is provided above the first differential pressure diaphragm assembly 1212 to achieve the reset of the first differential pressure diaphragm assembly 1212.

[0038] The first pilot valve 12B can be used to adjust the pressure on both sides of the first differential pressure diaphragm group 1212 of the first differential pressure main valve 12A, so as to realize the opening of the first valve port 114 and the adjustment of the opening degree.

[0039] In application, when the first pilot valve 12B is not energized or not manually opened, the gas flows in from the intake channel 111 and can flow into the first back pressure chamber 1211 of the first differential pressure main valve 12A through the first throttling orifice 1111 and the first guide channel 1112. At this time, the pressure on the upper and lower sides of the first differential pressure diaphragm assembly 1212 is balanced. Under the action of the first differential pressure elastic element 1213, the first differential pressure diaphragm assembly 1212 drives the first differential pressure valve plug 1214 to remain in the closed position with the first valve port 114 closed.

[0040] When the first pilot valve 12B is manually opened or energized, the first pilot valve port 1227 opens, and the second guide channel 1113 connecting the first throttling orifice 1111 and the first valve chamber 112 is opened. After the gas flowing into the intake channel 111 passes through the first throttling orifice 1111, some of the gas will flow into the first valve chamber 112 from the second guide channel 1113, and the gas flowing into the first back pressure chamber 1211 will decrease. As a result, a pressure difference is established on the upper and lower sides of the first differential pressure diaphragm assembly 1212, which can drive the first differential pressure valve plug 1214 to move upward to open the first valve port 114, so that the gas can be continuously supplied to the constant flame burner 40 from the first valve port 114 through the first flow channel 116.

[0041] The first pilot valve 12B can have various structural forms; specifically, a direct-acting solenoid valve can be used to reduce power consumption. Please also refer to Figure 3, which shows a partially enlarged view of the location of the first pilot valve in Figure 2.

[0042] The first pilot valve 12B has a first pilot valve cavity 1226, which is connected to a first pilot valve port 1227. For example, both the first pilot valve cavity 1226 and the first pilot valve port 1227 can be formed on the valve body 11, which has a high degree of integration and can simplify the assembly process of the gas valve 10.

[0043] The first pilot valve 12B includes a first coil 1221, a first stationary iron core 1222, a first moving iron core 1223, and a first pilot valve plug 1224. At least a portion of the first stationary iron core 1222 is fixedly inserted into the first coil 1221, and at least a portion of the first moving iron core 1223 is slidably inserted into the first coil 1221. The first pilot valve plug 1224 is located at the end of the first moving iron core 1223 away from the first stationary iron core 1222. The first moving iron core 1223 can approach or move away from the end of the first stationary iron core 1222 to drive the first pilot valve plug 1224 to open or close the first pilot valve port 1227.

[0044] As shown in Figures 2 and 3, the first coil 1221, the first stationary iron core 1222, the first moving iron core 1223, and the first pilot valve plug 1224 are located below the first pilot valve port 1227. The lower end of the first moving iron core 1223 is slidably inserted into the first coil 1221, and the upper end of the first moving iron core 1223 is connected to the first pilot valve plug 1224. After the first coil 1221 is energized, under the action of the magnetic field, the first moving iron core 1223 moves downward to attract the first stationary iron core 1222, thereby driving the first pilot valve plug 1224 to move downward to open the first pilot valve port 1227.

[0045] The first coil 1221 can be located on the outside of the valve body 11 to avoid occupying the internal space of the valve body 11. The upper end of the first moving iron core 1223 passes through the valve body 11 and extends into the first guide valve cavity 1226 formed on the valve body 11. The first coil 1221 and the valve body 11 can be sealed together by means of sealing rings, sealing gaskets, etc.

[0046] The first pilot valve 12B also includes a first valve-closing elastic element 1225. After the first coil 1221 is de-energized, the first valve-closing elastic element 1225 is used to cause the first moving iron core 1223 to drive the first pilot valve plug 1224 to reset to the valve-closing position where the first pilot valve port 1227 is closed. For example, the first valve-closing elastic element 1225 may be disposed between the first moving iron core 1223 and the first stationary iron core 1222.

[0047] In practical applications, after the first coil 1221 of the first pilot valve 12B is accidentally de-energized, the first pilot valve 12B can be reset to the closed position of closing the first pilot valve port 1227 under the action of the first valve closing elastic element 1225, thereby restoring the pressure on the upper and lower sides of the first back pressure chamber 1211 of the first differential pressure main valve 12A to balance, and the first differential pressure valve plug 1214 is reset to the closed position of closing the first valve port 114 under the action of the first differential pressure elastic element 1213, cutting off the gas supply to the constant open flame burner 40 to ensure the safety of the gas valve 10.

[0048] In practical applications, the thermopile 30 of the gas control system can supply power to the first coil 1221 of the first pilot valve 12B.

[0049] In this embodiment, a constant flame pressure stabilizing device 16 is installed on the valve body 11 of the gas valve 10. The constant flame pressure stabilizing device 16 is located between the first valve chamber 112 and the first flow channel 116, that is, the constant flame pressure stabilizing device 16 is located upstream of the first flow channel 116. The gas entering the first valve chamber 112 first passes through the constant flame pressure stabilizing device 16 for pressure regulation before entering the first flow channel 116 to ensure safety.

[0050] In this embodiment, the second valve group 13 for opening or closing the second valve port 115 includes a second differential pressure main valve 13A and a second pilot valve 13B. The thermopile 30 of the gas control system can supply power to the second pilot valve 13B, which is used to control the operation of the second differential pressure main valve 13A to open or close the second valve port 115.

[0051] The second differential pressure main valve 13A is located within the first valve chamber 112. The second differential pressure main valve 13A includes a second back pressure chamber 1321, a second differential pressure diaphragm assembly 1322, a second differential pressure elastic element 1323, and a second differential pressure valve plug 1324. The second differential pressure diaphragm assembly 1322 can drive the second differential pressure valve plug 1324 to open or close the second valve port 115. In the illustrated example, the second differential pressure valve plug 1324 is integrated onto the second differential pressure diaphragm assembly 1322. As shown in Figure 2, the second valve port 115 is located above the second differential pressure diaphragm assembly 1322, and the second back pressure chamber 1321 is located below it. The upper part of the second differential pressure diaphragm assembly 1322 is subjected to pressure from the first valve chamber 112. By adjusting the differential pressure on the upper and lower sides of the second differential pressure diaphragm assembly 1322, the second differential pressure valve plug 1324 can be moved closer to or away from the second valve port 115 to close or open the second valve port 115. A second differential pressure elastic element 1323 is provided below the second differential pressure diaphragm assembly 1322 to reset the second differential pressure valve plug 1324.

[0052] The basic structure of the first differential pressure main valve 12A and the second differential pressure main valve 13A is the same, which is conducive to the unification or standardization of the components of the gas valve 10.

[0053] The second pilot valve 13B can be used to adjust the pressure of the second back pressure chamber 1321 of the second differential pressure main valve 13A, thereby adjusting the pressure on both sides of the second differential pressure diaphragm assembly 1322, and thus realizing the opening and degree adjustment of the second valve port 115.

[0054] In this embodiment, the second pilot valve 13B includes a pilot valve seat 133, which is outside the valve body 11. The pilot valve seat 133 has a second pilot valve cavity 1331 and a second pilot valve port 1333. The second pilot valve port 1333 is connected to the second pilot valve cavity 1331, and the second pilot valve cavity 1331 is connected to the first valve cavity 112.

[0055] The gas valve 10 has a second flow channel 117 and a third flow channel 118. The inlet end of the second flow channel 117 is connected to the second pilot valve port 1333, and the outlet end of the second flow channel 117 is connected to the second valve chamber 113. The third flow channel 118 is connected to the second pilot valve chamber 1331 and the second back pressure chamber 1321 of the second differential pressure main valve 13A.

[0056] The second pilot valve 13B is configured such that, when energized, the second pilot valve port 1333 can be opened, and when de-energized, the second pilot valve port 1333 can be closed.

[0057] When the second pilot valve 13B is not energized, the second pilot valve port 1333 is closed, and the second flow channel 117 is cut off. The gas entering the second pilot valve chamber 1331 from the first valve chamber 112 cannot flow into the second flow channel 117. The gas entering the second pilot valve chamber 1331 will flow into the second back pressure chamber 1321 of the second differential pressure main valve 13A through the third flow channel 118. At this time, the upper and lower pressures of the second differential pressure diaphragm group 1322 of the second differential pressure main valve 13A are balanced. Under the action of the second differential pressure elastic element 1323, the second differential pressure diaphragm group 1322 drives the second differential pressure valve plug 1324 to remain in the closed position with the second valve port 115 closed.

[0058] When the second pilot valve 13B is energized, the second pilot valve port 1333 is opened, and the gas flowing into the second pilot valve chamber 1331 can flow into the second flow channel 117 through the second pilot valve port 1333 and flow to the second valve chamber 113. In this way, the amount of gas flowing into the second back pressure chamber 1321 is reduced, and a pressure difference can be established on both sides of the second differential pressure diaphragm group 1322 of the second differential pressure main valve 13A to drive the second differential pressure valve plug 1324 to open the second valve port 115, so that the gas can enter the second valve chamber 113 from the first valve chamber 112 through the second valve port 115, and flow from the second valve chamber 113 to the main furnace burner 50.

[0059] In a specific implementation, the gas valve 10 may be provided with a connecting channel 119, the pilot valve seat 133 has a second throttling orifice 1332, the second throttling orifice 1332 is connected to the second pilot valve chamber 1331, one end of the connecting channel 119 is connected to the first valve chamber 112, and the other end of the connecting channel 119 is connected to the second throttling orifice 1332.

[0060] The second pilot valve 13B can have various structural forms, and a direct-acting solenoid valve can also be used to reduce power consumption.

[0061] In this embodiment, the second pilot valve 13B includes a second coil 134, a second stationary iron core 135, a second moving iron core 136, and a second pilot valve plug 138. At least a portion of the second stationary iron core 135 is fixedly inserted into the second coil 134, and at least a portion of the second moving iron core 136 is slidably inserted into the second coil 134. The second pilot valve plug 138 is located at the end of the second moving iron core 136 away from the second stationary iron core 135. The second moving iron core 136 can move closer to or further away from the second stationary iron core 135 to drive the second pilot valve plug 138 to open or close the second pilot valve port 1333.

[0062] As shown in Figures 2 and 3, the second coil 134, the second stationary iron core 135, the second moving iron core 136, the second valve closing elastic element 137, and the second valve guide plug 138 are located below the second valve guide port 1333. The lower end of the second moving iron core 136 is slidably inserted into the second coil 134, and the upper end of the second moving iron core 136 is connected to the second valve guide plug 138. After the second coil 134 is energized, under the action of the magnetic field, the second moving iron core 136 moves downward to attract the second stationary iron core 135, thereby driving the second valve guide plug 138 to move downward to open the second valve guide port 1333.

[0063] The second coil 134 is sealed to the valve seat 133, and the upper end of the second moving iron core 136 connected to the second valve plug 138 passes through the valve seat 133 and is located in the second valve chamber 1331.

[0064] The second pilot valve 13B also includes a second valve-closing elastic element 137. After the second coil 134 is de-energized, the second valve-closing elastic element 137 is used to cause the second moving iron core 136 to drive the second pilot valve plug 138 to reset to the valve-closing position where the second pilot valve port 1333 is closed. For example, the second valve-closing elastic element 137 is disposed between the second moving iron core 136 and the second stationary iron core 135.

[0065] In specific implementation, the aforementioned first flow channel 1112, second flow channel 1113 and first flow channel 116 can all be formed on the valve body 11, or can be partially formed on the valve body 11, or partially formed as pipelines or other structures independent of the valve body 11.

[0066] The aforementioned second flow channel 117 and third flow channel 118 can be partially formed on the valve body 11, partially formed on the pilot valve seat 133, or partially formed in the form of pipelines. The connecting channel 119 can be partially formed on the valve body 11, partially formed in the form of pipelines, or entirely formed in the form of pipelines.

[0067] In this embodiment, the gas valve 10 also includes a pressure regulating valve 14, which is located on the second flow channel 117. That is, the gas entering the second flow channel 117 flows through the pressure regulating valve 14, and after being regulated and stabilized by the pressure regulating valve 14, it flows into the second valve chamber 113, and finally flows into the main furnace burner 50 from the gas outlet 1131.

[0068] The pressure regulating valve 14 can be set to adjust the gas flow rate, so that the second differential pressure main valve 13A maintains a certain opening to meet the outlet pressure setting requirements.

[0069] The pressure regulating valve 14 can adopt existing mature solutions, which will not be elaborated here.

[0070] In the application environment of the gas valve 10, the first pilot valve 12B of the first valve group 12 can be manually opened. In actual operation, force can be applied to the first moving iron core 1223 or the first pilot valve plug 1224 to make the first moving iron core 1223 and the first pilot valve plug 1224 move down together to open the first pilot valve port 1227, thereby opening the first valve port 114 of the first differential pressure main valve 12A. The aforementioned first gas supply path of the gas valve 10 is connected, and gas can be supplied to the constant flame burner 40. After the constant flame burner 40 is ignited, the thermopile 30 of the gas control system can be heated to generate electrical energy. The electrical energy generated by the thermopile 30 can supply power to the first pilot valve 12B, energizing its first coil 1221. In this way, the first differential pressure main valve 12A can be kept in the open position with the first valve port 114 open.

[0071] As shown in Figures 2 and 3, the gas valve 10 may be equipped with a connecting rod 91. One end of the connecting rod 91 is inserted into the valve body 11 and abuts against the first pilot valve plug 1224 of the first pilot valve 12B. The other end of the connecting rod 91 extends outside the valve body 11 for easy manual operation. In this way, the user can apply force to the first moving iron core 1223 and the first pilot valve plug 1224 by pressing the connecting rod 91 at one end outside the valve body 11, thereby causing the first moving iron core 1223 to drive the first pilot valve plug 1224 to move in the valve opening direction.

[0072] A knob 90 can be connected to one end of the connecting rod 91 outside the valve body 11 for easy operation.

[0073] A sealing structure is provided at the connection between the connecting rod 91 and the valve body 11 to ensure sealing and prevent gas leakage.

[0074] Referring again to Figures 1 and 2, after the gas control system is equipped with the aforementioned gas valve 10, in actual application, the user can manually open the first pilot valve 12B of the first valve group 12 to open the first gas supply path, so that gas can be supplied to the constant flame burner 40. The user ignites the constant flame burner 40, and the thermopile 30 located in the constant flame burner 40 is heated to generate electricity and supply electrical energy to the first valve group 12, so that the first valve group 12 is in the energized state, and the first valve port 114 remains in the open state to supply gas to the constant flame burner 40. The thermopile 30 also supplies power to the electronic controller 20. After being powered on, the electronic controller 20 determines whether to activate the power supply circuit of the second valve group 13 according to user settings. When the electronic controller 20 activates the power supply circuit of the second valve group 13, the second valve group 13 is in the open position (second valve port 115). Since the first valve group 12 is already in the open position, the second gas supply path is open, and gas can be supplied to the main furnace burner 50 through the first valve port 114 and the second valve port 115. The normally lit burner 40, located beside the main furnace burner 50, can ignite the gas supplied to the main furnace burner 50. When the electronic controller 20 cuts off the power supply circuit of the second valve group 13, the second valve group 13 is in the closed position (second valve port 115), the second gas supply path is cut off, and the main furnace burner 50 stops burning.

[0075] The gas control system utilizes a combination of a constant-flame burner 40 and a thermoelectric stack 30 to achieve self-generation. The first valve group 12 is kept open by the electrical energy provided by the thermoelectric stack 30. The thermoelectric stack 30 supplies power to the electronic controller 20, which controls the on / off state of the power supply circuit for the second valve group 13, allowing it to be opened or closed according to actual application requirements. This gas control system uses the constant-flame burner 40 to heat the thermoelectric stack 30 for power generation and the constant-flame burner 40 to ignite the main furnace burner 50. This eliminates the need for an external power source and external control modules, providing power to the system via the low-voltage electricity supplied by the thermoelectric stack 30. This design offers high safety, simple and convenient maintenance, and cost reduction.

[0076] The main burner 50 of this gas control system is used to heat the heated medium, typically water. The gas control system can be applied to scenarios such as gas water heaters or gas boilers. The following example uses water as the heated medium.

[0077] The gas control system also includes a temperature sensor 70, which detects the temperature of the water heated by the main boiler burner 50. The heated water is stored in a water tank 80. The temperature sensor 70 is communicatively connected to the electronic controller 20 to provide feedback signals. The electronic controller 20 can receive set temperature commands and control the on / off state of the power supply circuit of the second valve group 13 based on the set temperature command and the feedback signal from the temperature sensor 70.

[0078] In this embodiment, the gas control system also includes an igniter 60, which is used to ignite the constant flame burner 40. The igniter 60 can be manually operated to ignite the constant flame burner 40. Specifically, the igniter 60 can be a piezoelectric ignition device, which does not require power from the system and ensures safety.

[0079] In a specific implementation, the electronic controller 20 can be integrated into the gas valve 10 to simplify the structure. For example, the electronic controller 20 can be installed on the gas valve 10 near the first differential pressure main valve 12A.

[0080] In its specific implementation, the gas control system includes a control unit. This control unit is used to input a set temperature zone command to the electronic controller 20. The control unit is also used to manually open the first pilot valve 12B of the first valve group 12. The control unit can be the aforementioned knob 90, which can be communicatively connected to the electronic controller 20. Specifically, pressing the knob 90 applies force through the connecting rod 91 to the first moving iron core 1223 or the first pilot valve plug 1224 of the first pilot valve 12B to manually open the first pilot valve 12B, thereby opening the first differential pressure main valve 12A. The system's operating mode can be switched by rotating the knob 90 to set the desired water temperature. It can be understood that the system has different operating modes, and different heating temperatures are required for different operating modes. Each operating mode corresponds to a set temperature. Inputting an operating mode command to the electronic controller 20 is equivalent to inputting a desired set temperature zone command to the electronic controller 20.

[0081] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A gas valve, characterized in that, Includes valve body, first valve group and second valve group; The valve body has a first air supply path and a second air supply path. The first air supply path is provided with a first valve port, and the second air supply path is provided with a first valve port and a second valve port. The first valve assembly includes a first differential pressure main valve and a first pilot valve. The first pilot valve is used to adjust the pressure of the first back pressure chamber of the first differential pressure main valve to control the opening or closing of the first valve port of the first differential pressure main valve. The first pilot valve can be manually opened and, when energized, can keep the first differential pressure main valve in the position where the first valve port is open. The second valve group includes a second differential pressure main valve and a second pilot valve. The second pilot valve is used to adjust the pressure of the second back pressure chamber of the second differential pressure main valve to control the opening or closing of the second valve port of the second differential pressure main valve.

2. The gas valve according to claim 1, characterized in that, The valve body has an air intake channel, a first valve chamber, a second valve chamber, and a first throttling orifice; the gas valve has a first flow guide channel, a second flow guide channel, and a first flow passage. The air intake passage is connected to the first valve chamber through the first valve port, the first valve chamber is connected to the second valve chamber through the second valve port, and the first flow passage is connected to the first valve chamber. The first throttle orifice is connected to the intake channel, the first guide channel is connected to the first throttle orifice and the first back pressure chamber, and the second guide channel is connected to the first throttle orifice and the first valve chamber; The first pilot valve includes a first pilot valve port, which is located in the second flow channel; The first air supply path includes the air intake channel, the second flow guide channel, the first valve chamber, and the first flow channel; The second air supply path includes the air intake channel, the first valve chamber, and the second valve chamber.

3. The gas valve according to claim 2, characterized in that, The second pilot valve includes a pilot valve seat located outside the valve body. The pilot valve seat has a second pilot valve cavity and a second pilot valve port, the second pilot valve port communicating with the second pilot valve cavity; the second pilot valve cavity communicating with the first valve cavity. The gas valve has a second flow channel and a third flow channel. The inlet end of the second flow channel is connected to the second pilot valve port, the outlet end of the second flow channel is connected to the second valve chamber, and the third flow channel is connected to the second pilot valve chamber and the second back pressure chamber.

4. The gas valve according to claim 3, characterized in that, The gas valve has a communication channel, the pilot valve seat has a second throttling orifice, the second throttling orifice is connected to the second pilot valve cavity, one end of the communication channel is connected to the first valve cavity, and the other end of the communication channel is connected to the second throttling orifice.

5. The gas valve according to claim 3, characterized in that, The second pilot valve includes a second coil, a second stationary iron core, a second moving iron core, a second valve-closing elastic element, and a second pilot valve plug. At least a portion of the second stationary iron core is fixedly inserted into the second coil, and at least a portion of the second moving iron core is slidably inserted into the second coil. The second pilot valve plug is located at the end of the second moving iron core away from the second stationary iron core. The second moving iron core can move closer to or away from the second stationary iron core to drive the second pilot valve plug to open or close the second pilot valve port. The second valve-closing elastic element is located between the second moving iron core and the second stationary iron core.

6. The gas valve according to claim 3, characterized in that, The gas valve includes a pressure regulating valve, which is located on the second flow channel.

7. The gas valve according to any one of claims 2-5, characterized in that, The first pilot valve includes a first coil, a first stationary iron core, a first moving iron core, a first valve-closing elastic element, and a first pilot valve plug. At least a portion of the first stationary iron core is fixedly inserted into the first coil, and at least a portion of the first moving iron core is slidably inserted into the first coil. The first pilot valve plug is located at the end of the first moving iron core away from the first stationary iron core. The first moving iron core can move closer to or away from the first stationary iron core to drive the first pilot valve plug to open or close the first pilot valve port. The first valve-closing elastic element is located between the first moving iron core and the first stationary iron core.

8. The gas valve according to claim 7, characterized in that, The gas valve also includes a connecting rod, one end of which extends into the valve body and the other end of which is located outside the valve body. The connecting rod is slidable relative to the valve body to push the first pilot valve plug to move away from the first pilot valve port.

9. The gas valve according to any one of claims 2-5, characterized in that, The gas valve also includes a constant flame pressure stabilizing device, which is disposed between the first valve chamber and the first flow channel.

10. A gas control system, characterized in that, It includes a gas valve, a thermoelectric stack, a constant flame burner, and a main furnace burner; the gas valve is the gas valve according to any one of claims 1-9, the constant flame burner is connected to the first gas supply path, and the main furnace burner is connected to the second gas supply path; the constant flame burner is located beside the main furnace burner, the thermoelectric stack is located on the constant flame burner, and the thermoelectric stack can supply power to the first valve group.

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