A gas valve and gas control system

Abstract

This application discloses a gas valve and a gas control system. The gas valve includes a valve body, a first valve group, and a second valve group. The valve body has a first gas supply path and a second gas supply path. The first gas supply path has a first valve port, and the second gas supply path has both a first valve port and a second valve port. The first valve group is used to open or close the first valve port, and the second valve group is used to open or close the second valve port. The first valve group 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. The first pilot valve can be manually opened, and when energized, it can keep the first differential pressure main valve in the open position. This gas valve has a small number of valves, which helps to improve reliability.

Description

Technical Field

[0001] This application relates to the field of gas control technology, and in particular to a gas valve and a gas control system. Background Technology

[0002] 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.

[0003] 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

[0004] 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.

[0005] 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;

[0006] 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.

[0007] The first valve group is used to open or close the first valve port, and the second valve group is used to open or close the second valve port;

[0008] The first valve group 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] 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.

[0010] 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

[0011] Figure 1 This is a cross-sectional schematic diagram of the gas control system provided in one embodiment of this application;

[0012] Figure 2 for Figure 1 A cross-sectional schematic diagram of the gas valve shown;

[0013] Figure 3 for Figure 2 A partial enlarged view of the location of the first pilot valve in the first valve group;

[0014] Figure 4 for Figure 2 A partially enlarged view of the location of the second pilot valve in the second valve group;

[0015] Figure 5 for Figure 4 A magnified view of the J1 section.

[0016] Explanation of reference numerals in the attached figures:

[0017] Gas valve 10, electronic controller 20, thermopile 30, constant open flame burner 40, main furnace burner 50, igniter 60, temperature sensor 70, water tank 80, knob 90, connecting rod 91, capillary tube 100.

[0018] Valve body 11, air inlet channel 111, first throttle 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;

[0019] 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, stationary iron core 1222, 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;

[0020] 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, coil body 1341, coil support 1342, snap-fit ​​part 13421, boss 13422, first magnetic conductor 135, first magnetic section 1351, second magnetic section 1352, snap hole 13521, insertion hole 13522, second magnetic conductor 136, third magnetic conductor 137, bending section 1371, limiting part 1372, second pilot valve plug 138, second closing valve elastic element 139, pre-compression elastic element 1310;

[0021] Pressure regulating valve 14, constant open flame pressure stabilizing device 16. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] 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.

[0024] 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.

[0025] Please refer to Figure 1 and Figure 2 , Figure 1 This is a cross-sectional schematic diagram of the gas control system provided in one embodiment of this application; Figure 2 for Figure 1 The diagram shows a cross-sectional view of the gas valve. Figure 1 and Figure 2 The dashed lines in the diagram indicate structures that cannot be visually displayed. Figure 1 The double-dotted lines in the diagram represent control circuits or electrical control circuits.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] like Figure 2 As shown, 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.

[0034] 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.

[0035] The intake passage 111 is connected to the first valve chamber 112 through the first valve port 114, and the first valve chamber 112 is connected to the second valve chamber 113 through the second valve port 115.

[0036] 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.

[0037] 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.

[0038] The first flow channel 116 is connected to the first valve chamber 112.

[0039] When the gas valve 10 is applied to the gas control system, the first flow channel 116 can be used to communicate with the constant 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.

[0040] Combination Figure 1 and Figure 2One 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 the gas pipeline.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] by Figure 2 As shown, 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The first pilot valve 12B can have various structural forms; specifically, a direct-acting solenoid valve can be used to reduce power consumption. Please refer to the following: Figure 3 , Figure 3 It shows Figure 2 A magnified view of the location of the first pilot valve.

[0049] 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.

[0050] The first pilot valve 12B includes a first coil 1221, a stationary iron core 1222, a moving iron core 1223, and a first pilot valve plug 1224. At least a portion of the stationary iron core 1222 is fixedly inserted into the first coil 1221, and at least a portion of the 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 moving iron core 1223 away from the stationary iron core 1222. The moving iron core 1223 can move closer to or further away from the end of the stationary iron core 1222 to drive the first pilot valve plug 1224 to open or close the first pilot valve port 1227.

[0051] by Figure 2 and Figure 3As shown, the first coil 1221, the stationary iron core 1222, the 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 moving iron core 1223 is slidably inserted into the first coil 1221, and the upper end of the 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 moving iron core 1223 moves downward to attract the stationary iron core 1222, thereby driving the first pilot valve plug 1224 to move downward to open the first pilot valve port 1227.

[0052] 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 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.

[0053] 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 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 moving iron core 1223 and the stationary iron core 1222.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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. Figure 2 As shown, the second differential pressure diaphragm assembly 1322 has a second valve port 115 above it and a second back pressure chamber 1321 below it. 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.

[0059] 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.

[0060] 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.

[0061] The second pilot valve 13B can have various structural forms, which are described below. Figure 4 and Figure 5 This paper introduces a specific implementation method of the second pilot valve 13B.

[0062] In this embodiment, the second pilot valve 13B includes a pilot valve seat 133, which has a second pilot valve cavity 1331, a second throttling orifice 1332, and a second pilot valve port 1333. The second throttling orifice 1332 and the second pilot valve port 1333 are both connected to the second pilot valve cavity 1331, and the second throttling orifice 1332 is connected to the first valve cavity 112.

[0063] 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.

[0064] The second pilot valve 13B is an electromagnetic pilot valve. The second pilot valve 13B is configured such that when it is energized, the second pilot valve port 1333 can be opened, and when it is de-energized, the second pilot valve port 1333 can be closed.

[0065] 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 through the second throttle hole 1332 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.

[0066] 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.

[0067] In this embodiment, the second pilot valve 13B further includes a second coil 134, a first magnetic conductor 135, a second magnetic conductor 136, a third magnetic conductor 137, a second pilot valve plug 138, and a second valve closing elastic element 139.

[0068] The first magnetic conductor 135 is inserted into the second coil 134, with both ends of the first magnetic conductor 135 extending out of the second coil 134. The second magnetic conductor 136 is fixed to the first end of the first magnetic conductor 135. The second valve plug 138 is disposed at the first end of the third magnetic conductor 137. The second end of the third magnetic conductor 137 is connected to the second end of the first magnetic conductor 135. The first end of the third magnetic conductor 137 is suspended.

[0069] When the second coil 134 is energized, the first end of the third magnetic conductor 137 is attracted to the second magnetic conductor 136, and the second valve plug 138 is in the open position away from the second valve port 1333.

[0070] The second valve elastic element 139 can apply an elastic force to the first end of the third magnetic conductor 137, so that the second valve plug 138 moves in the direction of closing the second valve port 1333.

[0071] As described above, the second pilot valve 13B is a lever-type pilot valve. The first end of the third magnetic conductor 137 is suspended. After the second coil 134 is energized, under the action of magnetic force, the first end of the third magnetic conductor 137 can move towards the second magnetic conductor 136 to attract with the second magnetic conductor 136, thereby driving the second pilot valve plug 138 away from the second pilot valve port 1333 to open the second pilot valve port 1333. After the second coil 134 is de-energized, under the action of the second valve closing elastic element 139, the first end of the third magnetic conductor 137 moves away from the second magnetic conductor 136 to drive the second pilot valve plug 138 towards the second pilot valve port 1333 and reset to the valve closing position of closing the second pilot valve port 1333.

[0072] by Figure 2 and Figure 4 As shown, the first magnetic conductor 135 is inserted through the second coil 134 in the left-right direction. The left end of the first magnetic conductor 135 extends out of the second coil 134, and the left end of the first magnetic conductor 135 is its first end. The second magnetic conductor 136 is fixed to the left end of the first magnetic conductor 135. The right end of the first magnetic conductor 135 extends out of the second coil 134, and the right end of the first magnetic conductor 135 is its second end.

[0073] The third magnetic conductor 137 extends roughly in the left-right direction. The left end of the third magnetic conductor 137 is its first end, and the right end of the third magnetic conductor 137 is its second end. The right end of the third magnetic conductor 137 is connected to the right end of the first magnetic conductor 135, and the left end of the third magnetic conductor 137 is connected to the second valve plug 138.

[0074] The second pilot valve plug 138 is located to the left of the second magnetic conductor 136, and the second coil 134 is located to the right of the second magnetic conductor 136.

[0075] The third magnetic conductor 137 is located above the second magnetic conductor 136, and the second valve plug 138 is located below the second valve port 1333.

[0076] As configured above, when the second coil 134 is energized, the coil is energized, and a gap magnetic flux is formed through the first magnetic conductor 135, the third magnetic conductor 137 and the second magnetic conductor 136. Under the action of the second valve closing elastic element 139, there is a gap between the third magnetic conductor 137 and the second magnetic conductor 136. Through magnetic force, the movable end of the third magnetic conductor 137, that is, its first end, can be moved towards the second magnetic conductor 136 to attract each other, thereby driving the second valve plug 138 to open the second valve port 1333.

[0077] In a specific implementation, the second coil 134 includes a coil body 1341 and a coil support 1342, with the coil body 1341 wound around the outer periphery of the coil support 1342. The first magnetic conductor 135 includes a bent first magnetic conductor segment 1351 and a second magnetic conductor segment 1352. The first magnetic conductor segment 1351 is inserted into the coil support 1342, and the end of the first magnetic conductor segment 1351 away from the second magnetic conductor segment 1352 is fixedly connected to the second magnetic conductor 136. The coil support 1342 is fixedly connected to the second magnetic conductor segment 1352.

[0078] This ensures the stability of the relative position between the second coil 134 and the first magnetic conductor 135, and also facilitates the connection and cooperation between the first magnetic conductor 135 and the third magnetic conductor 137.

[0079] For example, the second magnetic conductor 136 can be in the form of an iron core.

[0080] For example, the second magnetic conductor 136 can be fixedly connected to the first magnetic conductor segment 1351 by riveting.

[0081] The second magnetic conductor segment 1352 may be provided with a locking hole 13521, and the coil support 1342 may be provided with a locking part 13421, which is fitted into the locking hole 13521. The coil support 1342 and the second magnetic conductor segment 1352 may also be fixed by other means, such as riveting.

[0082] The first magnetic conductor 135 is roughly L-shaped. The second magnetic section 1352 of the first magnetic conductor 135 is located outside the second coil 134. The second magnetic section 1352 is bent upward to facilitate connection with the third magnetic conductor 137 located above.

[0083] In a specific implementation, the second magnetic section 1352 has a socket 13522, the second end of the third magnetic body 137 passes through the socket 13522, and the third magnetic body 137 is provided with a first limiting structure, which is used to limit the position of the third magnetic body 137 relative to the second magnetic section 1352 in the direction away from the second pilot valve plug 138; the second pilot valve 13B also includes a second limiting structure, which is used to limit the position of the third magnetic body 137 relative to the second magnetic section 1352 in the direction closer to the second pilot valve plug 138.

[0084] As shown in the diagram, the second end of the third magnetic conductor 137 is inserted into the insertion hole 13522 of the second magnetic conductor section 1352 in a roughly left-right direction. The first limiting structure is used to prevent the third magnetic conductor 137 from moving excessively to the right, and the second limiting structure is used to prevent the third magnetic conductor 137 from moving excessively to the left. Under the action of the first limiting structure and the second limiting structure, the position of the third magnetic conductor 137 can be ensured, thereby ensuring that the second pilot valve plug 138 connected to the third magnetic conductor 137 can correspond to the position of the second pilot valve port 1333, and ensuring the reliability of the operation of the second pilot valve 13B.

[0085] In one implementation, the third magnetic conductor 137 is provided with a limiting surface 1372 facing away from the direction of the second guide valve plug 138, and the limiting surface 1372 can abut against the second magnetic section 1352; the first limiting structure includes the limiting surface 1372.

[0086] For example, the thickness of the third magnetic conductor 137 on the left side of the second magnetic section 1352 (referring to the vertical dimension in the figure) can be greater than the thickness of the portion that is inserted into the socket 13522, so that the aforementioned limiting surface 1372 can be formed to abut and limit the second magnetic section 1352.

[0087] For example, a stop protrusion can also be fixed on the third magnetic conductor 137, and the stop protrusion forms a limiting face facing the face of the second magnetic conductor segment 1352.

[0088] In one implementation, the second end of the third magnetic conductor 137 is provided with a bent section 1371, which is located on the side of the second magnetic conductor 1352 away from the second valve plug 138. The coil support 1342 is provided with a boss 13422 facing the third magnetic conductor 137. The boss 13422 is arranged inclined away from the second valve plug 138. A pre-compression elastic element 1310 is provided between the boss 13422 and the bent section 1371. The second limiting structure includes the bent section 1371, the boss 13422 and the pre-compression elastic element 1310.

[0089] like Figure 4 and Figure 5 As shown, because the boss 13422 is inclined toward the third magnetic conductor 137 and away from the second valve plug 138, the pre-compression elastic member 1310 provided between the bending section 1371 and the boss 13422 is also inclined to the right. In this way, the elastic force applied by the pre-compression elastic member 1310 to the third magnetic conductor 137 can keep the third magnetic conductor 137 in a position where the limiting face 1372 abuts against the second magnetic conductor section 1352 and is in close contact with the top wall of the insertion hole 13522, thereby ensuring the reliability of the fit between the second valve plug 138 and the second valve port 1333.

[0090] like Figure 2 As shown, in this embodiment, the second pilot valve 13B is located inside the valve body 11, and the pilot valve seat 133 of the second pilot valve 13B is an integral part of the valve body 11. This simplifies the assembly process of the gas valve 10 and also helps to reduce the volume occupied by the gas valve 10.

[0091] In other embodiments, the second pilot valve 13B may also be located outside the valve body 11, or the pilot valve seat 133 may also be a separate structure from the valve body 11.

[0092] 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.

[0093] Both the aforementioned second flow channel 117 and third flow channel 118 can be formed on the valve body 11; when the pilot valve seat 133 of the second pilot valve 13B is independently provided, the second flow channel 117 can also be partially formed on the valve body 11 and partially formed on the pilot valve seat 133, and the third flow channel 118 is similar.

[0094] 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.

[0095] 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.

[0096] The pressure regulating valve 14 can adopt existing mature solutions, which will not be elaborated here.

[0097] 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 moving iron core 1223 or the first pilot valve plug 1224 to make the 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.

[0098] like Figure 2 and Figure 3 As shown, 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 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 moving iron core 1223 to drive the first pilot valve plug 1224 to move in the valve opening direction.

[0099] A knob 90 can be connected to one end of the connecting rod 91 outside the valve body 11 for easy operation.

[0100] 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.

[0101] See again Figure 1 and Figure 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 is kept 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] In its 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. It 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 communicate with the electronic controller 20. Specifically, pressing the knob 90 applies force to the moving iron core 1223 or the first pilot valve plug 1224 of the first pilot valve 12B via the connecting rod 91 to manually open the first pilot valve 12B, thereby opening the first differential pressure main valve 12A. Rotating the knob 90 allows switching the system's operating mode to set the desired water temperature. It can be understood that the system has different operating modes, each with different requirements for water temperature. 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.

[0108] 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 group is used to open or close the first valve port, and the second valve group is used to open or close the second valve port; The first valve group 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.

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 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. The second pilot valve includes a pilot valve seat, which has a second pilot valve cavity, a second throttling orifice, and a second pilot valve port. The second throttling orifice and the second pilot valve port are both connected to the second pilot valve cavity, and the second throttling orifice is connected to 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 second pilot valve includes a second coil, a first magnetic conductor, a second magnetic conductor, a third magnetic conductor, a second pilot valve plug, and a second valve closing elastic element; The first magnetic conductor is inserted into the second coil, with both ends of the first magnetic conductor extending out of the second coil. The second magnetic conductor is fixed to the first end of the first magnetic conductor. The second valve plug is disposed at the first end of the third magnetic conductor. The second end of the third magnetic conductor is connected to the second end of the first magnetic conductor. The first end of the third magnetic conductor is suspended. When the second coil is energized, the first end of the third magnetic conductor is attracted to the second magnetic conductor, and the second valve plug is in the open position away from the second valve port; The second valve-closing elastic element can apply an elastic force to the first end of the third magnetic conductor to move the second valve plug in the direction of closing the second valve port.

5. The gas valve according to claim 4, characterized in that, The second coil includes a coil body and a coil support, wherein the coil body is wound around the outer periphery of the coil support; The first magnetic conductor includes a bent first magnetic conductor segment and a second magnetic conductor segment. The first magnetic conductor segment is inserted into the coil bracket. The end of the first magnetic conductor segment away from the second magnetic conductor segment is fixedly connected to the second magnetic conductor. The coil bracket is fixedly connected to the second magnetic conductor segment.

6. The gas valve according to claim 5, characterized in that, The second magnetic conductor has a socket, and the second end of the third magnetic conductor passes through the socket. The third magnetic conductor is provided with a first limiting structure, which restricts the third magnetic conductor from moving away from the second magnetic conductor relative to the second magnetic conductor. The second valve also includes a second limiting structure, which restricts the third magnetic conductor from moving closer to the second valve plug relative to the second magnetic conductor.

7. The gas valve according to claim 6, characterized in that, The third magnetic conductor is provided with a limiting face facing away from the direction of the second valve plug, and the limiting face can abut against the second magnetic segment; the first limiting structure includes the limiting face. The second end of the third magnetic conductor is provided with a bent section, which is located on the side of the second magnetic conductor away from the second valve plug. The coil support is provided with a boss facing the third magnetic conductor, which is arranged at an angle away from the second valve plug. A pre-compression elastic element is provided between the boss and the bent section. The second limiting structure includes the bent section, the boss and the pre-compression elastic element.

8. The gas valve according to claim 3, characterized in that, The second pilot valve is located inside the valve body, and the pilot valve seat and the valve body are an integral part.

9. 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.

10. The gas valve according to any one of claims 1-9, characterized in that, The first pilot valve is a direct-acting solenoid valve.

11. 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 1-10, 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 can supply power to the first valve group.

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