Solenoid valve for gas valve and gas valve

Abstract

This application discloses an electromagnetic valve and a gas valve for use in a gas valve. The electromagnetic valve includes a housing, three magnetic conductors, a coil, a valve stem, a seal, and a closing elastic element. At least a portion of the first and second magnetic conductors are fixed inside the housing, and the third magnetic conductor is located inside the housing. The first magnetic conductor includes a bottom wall and a side wall fixed to the outer edge of the bottom wall. The second magnetic conductor is fixedly connected to the bottom wall. The coil is sleeved on the second magnetic conductor and is located inside the side wall. The seal and the third magnetic conductor are respectively connected to both ends of the valve stem. The valve stem is slidably inserted into the housing to move the seal closer to or away from the valve port of the gas valve. The closing elastic element is located between the seal and the housing. When the coil is energized, the third magnetic conductor is in contact with the first and second magnetic conductors, forming a closed annular magnetic flux between the third magnetic conductor and the first and second magnetic conductors. The seal is in an open position away from the valve port. This electromagnetic valve consumes little power.

Description

Technical Field

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

[0002] The gas valve is equipped with a thermocouple solenoid valve. The valve can be opened manually to supply gas to the open flame burner. After the open flame burner is ignited, the thermoelectric stack at the burner is heated and generates electricity, which supplies power to the thermocouple solenoid valve, keeping it in the open position. If the flame is accidentally extinguished, the thermoelectric stack cannot supply power, and the thermocouple solenoid valve is in the de-energized and closed position, which can cut off the gas supply and play a role in flameout protection.

[0003] The solenoid valve includes a magnetic conductor, and there is room for improvement in the magnetic transmission efficiency of this conductor. Summary of the Invention

[0004] The purpose of this application is to provide a solenoid valve and a gas valve for use in a gas valve. The solenoid valve's structural design can provide magnetic transmission efficiency, thereby reducing power consumption, achieving energy-saving effects, and broadening the options for power supply to the gas valve.

[0005] To solve the above-mentioned technical problems, this application provides a solenoid valve for a gas valve, wherein the gas valve includes a valve port, and the solenoid valve includes a housing, a first magnetic conductor, a second magnetic conductor, a third magnetic conductor, a coil, a valve stem, a seal, and a valve closing elastic element;

[0006] The first magnetic conductor and the second magnetic conductor are at least partially fixed inside the housing, and the third magnetic conductor is located inside the housing. The first magnetic conductor includes a bottom wall portion and a side wall portion fixed to the outer edge of the bottom wall portion. The second magnetic conductor is fixedly connected to the bottom wall portion. The coil is sleeved on the second magnetic conductor and is located inside the side wall portion.

[0007] The sealing element and the third magnetic conductor are respectively connected to both ends of the valve stem. The valve stem is slidably inserted into the housing to move the sealing element closer to or away from the valve port of the gas valve. The valve closing elastic element is disposed between the sealing element and the housing.

[0008] The coil is energized, the third magnetic conductor is in contact with the first magnetic conductor and the second magnetic conductor, and a closed annular magnetic flux is formed between the third magnetic conductor, the first magnetic conductor and the second magnetic conductor, and the sealing element is in the open position away from the valve port.

[0009] This application also provides a gas valve, including a valve body and a solenoid valve, wherein the solenoid valve is any of the solenoid valves described above, the valve body has an air inlet channel and a first valve chamber, the air inlet channel is connected to the first valve chamber through a first valve port, the solenoid valve is used to open or close the first valve port, and the housing is fixedly connected to the valve body.

[0010] The solenoid valve provided in this application can be used in gas valves. The solenoid valve can form two sets of U-shaped magnetic flux through the structural cooperation of the first and second magnetic conductors. Combined with the setting of the third magnetic conductor and the coil, after the coil is energized, the third magnetic conductor attracts and adheres to the first and second magnetic conductors, forming a closed annular magnetic flux between the third magnetic conductor and the first and second magnetic conductors. In this way, the magnetic transmission efficiency can be fully achieved, the current consumption can be reduced, and the energy-saving effect can be achieved. Attached Figure Description

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

[0012] Figure 2 for Figure 1 A schematic diagram of the structure of the solenoid valve;

[0013] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the solenoid valve in the closed state.

[0014] Figure 4 for Figure 2 The diagram shows a cross-sectional view of the solenoid valve in the open position.

[0015] Figure 5 for Figure 2 A partial structural schematic diagram of the solenoid valve shown.

[0016] Figure 6 for Figure 5 A schematic diagram of the magnetic flux of the solenoid valve after it is energized.

[0017] Figure 7 This is a schematic diagram of the magnetic flux after the solenoid valve is energized in another variation.

[0018] Figure 8 for Figure 1 A magnified view of part A in the middle;

[0019] Figure 9 A partial schematic diagram of the replacement scheme at the joint between the connecting rod and the valve body;

[0020] Figure 10 This is a cross-sectional schematic diagram of a gas control system provided in one embodiment of this application.

[0021] Explanation of reference numerals in the attached figures:

[0022] 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.

[0023] Valve body 11, air inlet passage 111, first valve chamber 112, second valve chamber 113, air outlet 1131, first valve port 114, second valve port 115, first flow passage 116, second flow passage 117, normally open throttling orifice 1171, third flow passage 118, connecting hole 1191, mounting groove 1192, second sealing ring 1193, diaphragm 1193', end cap 1194;

[0024] Solenoid valve 12, housing 121, outer shell 1211, guide shell 12111, top shell 12112, side shell 12113, base 1212, first magnetic conductor 122, bottom wall 1221, side wall 1222, first side wall section 12221, second side wall section 12222, notch 12223, second magnetic conductor 123, limiting surface 1231, third magnetic conductor 124, coil 125, terminal block 1251, valve stem 1261, ball head 12611, seal 1262, support 1263, groove 12631, riveting part 12632, valve closing elastic element 1264, metal bushing 127, first sealing ring 128, end cap 129;

[0025] Second valve group 13, pilot valve assembly 131, differential pressure valve assembly 132, back pressure chamber 1321, differential pressure diaphragm assembly 1322, differential pressure elastic element 1323, differential pressure valve plug 1324.

[0026] Pressure regulating valve 14, constant open flame pressure stabilizing device 16. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] Please refer to Figures 1 to 4 , Figure 1 This is a cross-sectional schematic diagram of a gas valve provided in one embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the structure of the solenoid valve; Figure 3 for Figure 2 The diagram shows a cross-sectional view of the solenoid valve in the closed state. Figure 4 for Figure 2 The diagram shows a cross-sectional view of the solenoid valve in the open position.

[0030] The solenoid valve 12 provided in this embodiment can be used in the gas valve 10. Figure 1 The diagram shows a schematic of a gas valve 10 containing a solenoid valve 12 in an application example.

[0031] The gas valve 10 has a first gas supply path and a second gas supply path. The first gas supply path can be used to supply gas to the constant flame burner, and the second gas supply path can be used to supply gas to the main furnace burner. In application, the constant flame burner is located beside the main furnace burner so that it can ignite the main furnace burner. It can be understood that the constant flame burner can only be ignited when gas is supplied to it, and the burning constant flame burner can only ignite the main furnace burner when gas is supplied to it.

[0032] The gas valve 10 has a first valve port 114 on the first gas supply path and a second valve port 115 on the second gas supply path. In other words, the first valve port 114 is located on both the first and second gas supply paths, and the first and second gas supply paths have overlapping path portions, with the first valve port 114 located on the overlapping path portion.

[0033] The gas valve 10 includes a first valve group and a second valve group 13. The first valve group 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 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. When the first valve group 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. When at least one of the first valve group 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. When both the first valve group 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.

[0034] The first valve group of the gas valve 10 can be the solenoid valve 12 provided in this embodiment.

[0035] In some embodiments, the gas valve 10 includes a valve body 11, and the aforementioned first gas supply path and second gas supply path are substantially formed on the valve body 11.

[0036] like Figure 1As shown, the valve body 11 has an air inlet channel 111, a first valve chamber 112, a second valve chamber 113, and a first flow channel 116. The air inlet channel 111 is connected to the first valve chamber 112 through the aforementioned first valve port 114. One end of the first flow channel 116 is connected to the first valve chamber 112, and the other end of the first flow channel 116 is used to connect to the constant flame burner. The first valve chamber 112 is connected to the second valve chamber 113 through the aforementioned second valve port 115. The second valve chamber 113 has an air outlet 1131, which is used to connect to the main furnace burner.

[0037] Thus, the first gas supply path of the gas valve 10 includes an intake channel 111, a first valve chamber 112, and a first flow channel 116, and the second gas supply path of the gas valve 10 includes an intake channel 111, a first valve chamber 112, and a second valve chamber 113.

[0038] In this embodiment, the solenoid valve 12 is configured such that, when energized, it can remain in the position where the first valve port 114 is open, and it can also be manually opened. The solenoid valve 12 alone can be used to open or close the first gas supply path to the open flame burner, which simplifies the structure of the gas valve 10.

[0039] Combination Figures 1 to 4 In this embodiment, the solenoid valve 12 includes a housing 121, a first magnetic conductor 122, a second magnetic conductor 123, a third magnetic conductor 124, a coil 125, a valve stem 1261, and a seal 1262.

[0040] At least a portion of the first magnetic conductor 122 and the second magnetic conductor 123 are fixed inside the housing 121. The third magnetic conductor 124 is located inside the housing 121. The first magnetic conductor 122 includes a bottom wall portion 1221 and a side wall portion 1222 fixed to the outer edge of the bottom wall portion 1221. The second magnetic conductor 123 is fixedly connected to the bottom wall portion 1221. A coil 125 is sleeved on the second magnetic conductor 123, and the coil 125 is located inside the side wall portion 1222. It can be understood that the second magnetic conductor 123 is located inside the side wall portion 1222.

[0041] The seal 1262 and the third magnetic conductor 124 are respectively connected to the two ends of the valve stem 1261. The valve stem 1261 is slidably inserted into the housing 121 so as to drive the seal 1262 to move closer to or away from the first valve port 114 of the gas valve 10.

[0042] When coil 125 is energized, the third magnetic conductor 124 is in contact with the first magnetic conductor 122 and the second magnetic conductor 123, forming a closed annular magnetic flux between the third magnetic conductor 124 and the first and second magnetic conductors 122 and 123. The seal 1262 is in the open position, away from the first valve port 114. The closed annular magnetic flux is as follows: Figure 4The midpoint is indicated by a dashed line. It can be understood that after the coil 125 is energized, a magnetic attraction is generated between the third magnetic conductor 124 and the first magnetic conductor 122 and the second magnetic conductor 123. Under the action of the magnetic attraction, the third magnetic conductor 124 moves towards the first magnetic conductor 122 and the second magnetic conductor 123, which drives the valve stem 1261 and the seal 1262 to move away from the first valve port 114.

[0043] In a specific implementation, the solenoid valve 12 can be connected to the valve body 11 of the gas valve 10 via the housing 121. At least a portion of the solenoid valve 12 is located within the valve body 11 to cooperate with the first valve port 114 of the valve body 11. Figure 1 In the embodiment shown, the solenoid valve 12 is located below the first valve port 114, and the seal 1262 corresponds to the position of the first valve port 114. The valve stem 1261 moves the seal 1262 upward to close the first valve port 114, and the valve stem 1261 moves the seal 1262 downward to open the first valve port 114.

[0044] The solenoid valve 12 using the above scheme can form a U-shaped magnetic flux through the structural cooperation of the first magnetic conductor 122 and the second magnetic conductor 123. Combined with the arrangement of the third magnetic conductor 124 and the coil 125, after the coil 125 is energized, the third magnetic conductor 124 attracts and adheres to the first magnetic conductor 122 and the second magnetic conductor 123, forming a closed annular magnetic flux between the third magnetic conductor 124 and the first magnetic conductor 122 and the second magnetic conductor 123. In this way, the magnetic transmission efficiency can be improved, the current consumption can be reduced, and the energy-saving effect can be achieved. Thus, the solenoid valve 12 can work under low voltage and current conditions or in working environments with small power distribution.

[0045] In the specific application environment of the gas valve 10, the gas valve 10 only needs to provide a low amount of electrical energy to the solenoid valve 12 to keep the solenoid valve 12 in the position of opening the first valve port 114, so that the path for supplying gas to the open flame burner is always in a conductive state. This can broaden the selection of power supply for the gas valve 10 and provide technical support for the control system of the gas valve 10 to operate only by being powered by the thermopile.

[0046] In specific implementation, the end face of the first magnetic conductor 122 facing the third magnetic conductor 124 and the end face of the second magnetic conductor 123 facing the third magnetic conductor 124 are on the same plane. As shown in the diagram, the top surface of the first magnetic conductor 122 and the top surface of the second magnetic conductor 123 are on the same plane, and the top surface of the coil 125 is lower than the top surfaces of the first and second magnetic conductors 122 and 123. This helps ensure the fit between the third magnetic conductor 124 and the first and second magnetic conductors 122 and 123, reduces magnetic leakage, and helps reduce the power consumption of the solenoid valve 12.

[0047] For example, the second magnetic conductor 123 can be made of iron core.

[0048] In some embodiments, the solenoid valve 12 includes a valve-closing elastic element 1264 located between the seal 1262 and the third magnetic conductor 124. One end of the valve-closing elastic element 1264 may abut against the seal 1262 (including direct or indirect abutment), and the other end of the valve-closing elastic element 1264 may abut against the housing 121.

[0049] With the above settings, when the valve stem 1261, seal 1262, and third magnetic conductor 124 move in the valve opening direction (closer to the first magnetic conductor 122 and the second magnetic conductor 123), the valve closing elastic element 1264 accumulates elastic deformation energy. After the coil 125 is de-energized, the magnetic attraction between the third magnetic conductor 124 and the first magnetic conductor 122 and the second magnetic conductor 123 disappears. Under the action of the elastic deformation energy accumulated in the valve closing elastic element 1264, the valve stem 1261 can drive the seal 1262 and the third magnetic conductor 124 to move away from the first magnetic conductor 122 and the second magnetic conductor 123 to the valve closing position where the seal 1262 closes the first valve port 114. In this way, after the solenoid valve 12 is applied to the gas valve 10, if the coil 125 is accidentally de-energized, the solenoid valve 12 can be reset to the valve closing position, cutting off the gas supply to the constant flame burner in the gas valve 10, thus ensuring safety.

[0050] Please refer to this as well. Figure 5 , Figure 5 for Figure 2 A partial structural diagram of the solenoid valve is shown.

[0051] In some embodiments, housing 121 may include an outer shell 1211 and a base 1212. The outer shell 1211 is generally a cylindrical structure with an open bottom, and the base 1212 is fixedly connected to the bottom of the outer shell 1211 to seal the bottom opening of the outer shell 1211. This structure facilitates the assembly of other structural housings 121 of the solenoid valve 12.

[0052] The outer casing 1211 and the base 1212 can be fixed by means of snap-fit ​​or screw connection.

[0053] The base 1212 supports the first magnetic conductor 122, and the outer shell 1211 is fitted over the first magnetic conductor 122. The second magnetic conductor 123 can pass through the bottom wall 1221 of the first magnetic conductor 122 and be fixedly connected to the base 1212. The relative positions of the first magnetic conductor 122 and the base 1212 are fixed.

[0054] In one implementation, the first magnetic conductor 122 can be fixed in position by the cooperation of the second magnetic conductor 123 and the base 1212.

[0055] For example, such as Figure 3As shown, the second magnetic conductor 123 has a downward-facing limiting surface 1231. After the second magnetic conductor 123 passes through the bottom wall portion 1221 and is fixedly connected to the base 1212, the limiting surface 1231 abuts against the bottom wall portion 1221. In this way, because the second magnetic conductor 123 is relatively fixed to the base 1212, the position of the first magnetic conductor 122 can be restricted by the cooperation of the limiting surface 1231 and the bottom wall portion 1221, so that the first magnetic conductor 122 is relatively fixed to the base 1212.

[0056] In other implementations, the first magnetic conductor 122 can also be fixed to the base 1212 using other connection methods.

[0057] In one implementation, the second magnetic conductor 123 and the base 1212 can be fixed by riveting.

[0058] The bottom end of the second magnetic conductor 123 may be provided with a downwardly extending section, which can pass through the base 1212 and be riveted to the base 1212 to achieve a fixed connection between the second magnetic conductor 123 and the base 1212.

[0059] In one implementation, the sidewall portion 1222 of the first magnetic conductor 122 includes a first sidewall segment 12221 and a second sidewall segment 12222, which are located on both sides of the second magnetic conductor 123. Along the circumferential direction, there is a notch 12223 between the first sidewall segment 12221 and the second sidewall segment 12222, and the wiring terminal 1251 of the coil 125 can be led out from the notch 12223 and integrally injection molded with the base 1212.

[0060] After the terminal block 1251 and the base 1212 are injection molded as one piece, part of the terminal block 1251 extends out of the base 1212 to facilitate electrical connection with relevant control components or power supply components.

[0061] In practice, the base 1212 is made of plastic to facilitate injection molding with the terminal block 1251. Based on the plastic base 1212, a metal bushing 127 can be provided between the second magnetic conductor 123 and the base 1212. The extension section at the bottom of the second magnetic conductor 123 can be riveted and fixed to the metal bushing 127. The metal bushing 127, the base 1212, and the terminal block 1251 are injection molded into a single structure. This design facilitates leading the terminal block 1251 of the coil 125 out of the housing 121 while ensuring the reliability of the fixation between the second magnetic conductor 123 and the base 1212 of the housing 121.

[0062] In some embodiments, a first sealing ring 128 is provided between the second magnetic conductor 123 and the metal bushing 127. This ensures a tight seal and prevents external impurities from entering between the second magnetic conductor 123 and the first magnetic conductor 122, thus affecting the normal operation of the solenoid valve 12.

[0063] like Figure 5 As shown, the first sidewall segment 12221 and the second sidewall segment 12222 have two notches 12223 in the circumferential direction, and the two terminals 1251 of the coil 125 extend out from the two notches 12223 respectively.

[0064] After the side wall portion 1222 of the first magnetic conductor 122 is configured as described above, when the coil 125 is energized, a closed annular magnetic flux is formed between the third magnetic conductor 124 and the first side wall portion 12221, the bottom wall portion 1221, and the second magnetic conductor 123. Another closed annular magnetic flux is formed between the third magnetic conductor 124 and the second side wall portion 12222, the bottom wall portion 1221, and the second magnetic conductor 123.

[0065] After the sidewall portion 1222 of the first magnetic conductor 122 is configured as described above, the two closed annular magnetic fluxes formed are as follows: Figure 6 The dotted lines in the diagram indicate that each closed ring-shaped magnetic flux has an overall roughly arc-shaped structure.

[0066] In specific implementation, the first sidewall segment 12221 and the second sidewall segment 12222 are evenly distributed in the circumferential direction, or in other words, the first sidewall segment 12221 and the second sidewall segment 12222 are symmetrical with respect to the second magnetic conductor 123. In this way, after the coil 125 is energized, the magnetic attraction between the third magnetic conductor 124 and the first magnetic conductor 122 and the second magnetic conductor 123 can be balanced. Under the action of magnetic attraction, the reliability of the movement direction of the third magnetic conductor 124 and the valve stem 1261 is high, which is conducive to ensuring the fit between the third magnetic conductor 124 and the first magnetic conductor 122 and the second magnetic conductor 123.

[0067] In other embodiments, the sidewall portion 1222 of the first magnetic conductor 122 can be a circumferentially closed annular structure, generally cylindrical in shape. In this case, the closed annular magnetic flux formed between the first magnetic conductor 122, the second magnetic conductor 123, and the third magnetic conductor 124 is circumferentially continuous and generally annular in structure, as can be seen from [reference needed]. Figure 7 understand, Figure 7 The dashed line in the middle illustrates the magnetic flux form when the side wall portion 1222 of the first magnetic conductor 122 has a circumferentially continuous cylindrical structure.

[0068] In some embodiments, the housing 121 includes a guide housing portion 12111, into which the valve stem 1261 is inserted, and the outer peripheral wall of the valve stem 1261 slides against the inner wall of the guide housing portion 12111. In this way, the guide housing portion 12111 can guide the movement of the valve stem 1261, ensuring the sealing effect of the seal 1262 on the first valve port 114 when the valve is closed, and ensuring the fit between the third magnetic conductor 124 and the first magnetic conductor 122 and the second magnetic conductor 123 when the valve is opened.

[0069] The guide shell portion 12111 is specifically disposed on the top of the outer shell 1211. The outer shell 1211 of the outer shell 1211 includes a top shell portion 12112, and the guide shell portion 12111 extends axially upward from the top end of the top shell portion 12112. The guide shell portion 12111 is generally in the form of a sleeve-shaped structure.

[0070] In some embodiments, the end of the valve stem 1261 extending out of the guide housing 12111 is connected to a support member 1263, and the seal member 1262 is disposed on the side of the support member 1263 facing away from the guide housing 12111.

[0071] The seal 1262 is generally made of flexible or elastic material. The support 1263 provides reliable support for the seal 1262, ensuring that the seal 1262 can reliably close the first valve port 114 when the valve is closed.

[0072] The seal 1262 can be fixedly connected to the support 1263 by snap-fit, or it can be fixed by other methods such as adhesive bonding.

[0073] The top shell portion 12112 is fixedly connected to the end of the guide shell portion 12111 away from the support member 1263. Specifically, the aforementioned valve-closing elastic member 1264 can be disposed between the top shell portion 12112 and the support member 1263, with one end of the valve-closing elastic member 1264 abutting against the top shell portion 12112 and the other end of the valve-closing elastic member 1264 abutting against the support member 1263.

[0074] In a specific implementation, the valve-closing elastic element 1264 can be fitted onto the guide housing 12111 for limiting its position. For example, the valve-closing elastic element 1264 can be a spring structure.

[0075] In one implementation, a ball head 12611 is provided at the end where the valve stem 1261 connects to the support member 1263. The support member 1263 is riveted to the ball head 12611 with a clearance fit. In this way, the support member 1263 and the valve stem 1261 have a certain swing range relative to each other, which can improve the problem that the seal 1262 cannot reliably seal with the first valve port 114 or the third magnetic conductor 124 cannot reliably fit with the first magnetic conductor 122 and the second magnetic conductor 123 due to installation errors, thus playing an automatic correction role.

[0076] The support member 1263 may have a groove 12631 on the side facing the valve stem 1261. The groove 12631 is open and has a riveting part 12632 at the opening. After the ball head 12611 of the valve stem 1261 extends into the groove 12631, the riveting part 12632 can be bent and riveted onto the ball head 12611 to realize the connection between the support member 1263 and the valve stem 1261.

[0077] In some embodiments, the valve stem 1261 is inserted into the third magnetic conductor 124, which is axially limited and circumferentially gapped with the valve stem 1261.

[0078] With this configuration, the third magnetic conductor 124 has a certain amount of mobility, and can automatically correct itself when it is in contact with the first magnetic conductor 122 and the second magnetic conductor 123, so as to ensure the planar fit with the first magnetic conductor 122 and the second magnetic conductor 123.

[0079] In a specific implementation, the third magnetic conductor 124 and the valve stem 1261 can be connected by riveting to limit their relative positions in the axial direction (the axial direction of the valve stem 1261).

[0080] In some embodiments, such as Figure 1 As shown, the outer shell portion 1211 of the housing 121 of the solenoid valve 12 can be located substantially inside the valve body 11, and the base 1212 is sealed and fixed to the valve body 11.

[0081] In other embodiments, such as Figure 3 and 4 As shown, the solenoid valve 12 may also include a head 129, which is fixed below the base 1212 of the housing 121. The solenoid valve 12 can be fixedly connected to the valve body 11 of the gas valve 10 through the head 129.

[0082] After being applied to the gas valve 10, the solenoid valve 12 can also be manually opened. In actual operation, force can be applied to the valve stem 1261, causing the valve stem 1261 to move the sealing element 1262 and the third magnetic conductor 124 downwards to open the first valve port 114. After the first valve port 114 is opened, the aforementioned first gas supply path of the gas valve 10 is connected, and gas can be supplied to the open flame burner. After the open flame burner is ignited, the thermopile of the gas control system can be heated to generate electrical energy. The electrical energy generated by the thermopile can power the solenoid valve 12, energizing its coil 125. In this way, the solenoid valve 12 can be kept in the open position with the first valve port 114 open.

[0083] like Figure 1As 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 support member 1263 of the solenoid valve 12, while 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 support member 1263 by pressing the connecting rod 91 at one end outside the valve body 11, thereby causing the valve rod 1261 to move the sealing member 1262 and the third magnetic conductor 124 in the valve opening direction.

[0084] A knob 90 can be connected to one end of the connecting rod 91 outside the valve body 11 for easy operation.

[0085] 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.

[0086] Please refer to this as well. Figure 8 , Figure 8 for Figure 1 A magnified view of part A in the middle.

[0087] In one implementation of the above-mentioned sealing structure, combined with Figure 1 and Figure 8 The gas valve 10 has a connecting hole 1191 on its valve body 11. The upper end of the connecting rod 91 can pass through the connecting hole 1191 and extend out of the valve body 11. The valve body 11 has a mounting groove 1192 above the connecting hole 1191. A second sealing ring 1193 is provided in the mounting groove 1192. The connecting rod 91 passes through the second sealing ring 1193. An end cap 1194 is fixedly connected above the mounting groove 1192 to limit the position of the second sealing ring 1193.

[0088] Please refer to this as well. Figure 9 , Figure 9 This is a partial schematic diagram of the replacement scheme for the connection between the connecting rod and the valve body.

[0089] In another implementation of the above-mentioned sealing structure, a diaphragm 1193' is fitted onto one end of the connecting rod 91 that extends out of the valve body 11. The inner ring of the diaphragm 1193' is airtightly connected to the connecting rod 91, and the outer ring of the diaphragm 1193' is located in the mounting groove 1192 of the valve body 11 and is positioned by pressing against the end cap 1194 fixed to the valve body 11. The inner and outer rings of the diaphragm 1193' are connected by an elastic structure to ensure that the connecting rod 91 can move axially along the solenoid valve 12.

[0090] In practical applications, the end of the connecting rod 91 located inside the valve body 11 can either contact only the support member 1263 of the solenoid valve 12, or it can be fixedly connected to the support member 1263.

[0091] This application embodiment also provides a gas valve 10, which includes the aforementioned solenoid valve 12. Part of the structure of the gas valve 10 has been described above and will not be repeated here. The following is in conjunction with… Figure 1 The structure of the other parts of the gas valve 10 will be described.

[0092] 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.

[0093] In this embodiment, the second valve assembly 13 for opening or closing the second valve port 115 includes a pilot valve assembly 131 and a differential pressure valve assembly 132. The thermopile 30 of the gas control system can supply power to the pilot valve assembly 131, which controls the operation of the differential pressure valve assembly 132 to open or close the second valve port 115. The second valve port 115 is opened or closed via the differential pressure valve assembly 132.

[0094] The valve body 11 also has a second flow channel 117 and a third flow channel 118.

[0095] The inlet end of the second flow channel 117 is connected to the first valve chamber 112, and the outlet end of the second flow channel 117 is connected to the second valve chamber 113. The pilot valve assembly 131 is located downstream of the inlet end of the second flow channel 117 and is used to open or close the second flow channel 117.

[0096] The inlet of the third flow channel 118 is connected to the second flow channel 117, and the outlet of the third flow channel 118 is connected to the back pressure chamber 1321 of the differential pressure valve assembly 132. The inlet of the third flow channel 118 is located between the inlet of the second flow channel 117 and the pilot valve assembly 131. In other words, the shut-off of the second flow channel 117 by the pilot valve assembly 131 only affects the amount of gas entering the second valve chamber 113 through the second flow channel 117, and does not affect the flow of gas between the second flow channel 117 and the third flow channel 118.

[0097] In one implementation, the differential pressure valve assembly 132 is located within the first valve chamber 112. The differential pressure valve assembly 132 includes a back pressure chamber 1321, a differential pressure diaphragm assembly 1322, a differential pressure elastic element 1323, and a differential pressure valve plug 1324. The differential pressure diaphragm assembly 1322 can drive the differential pressure valve plug 1324 to open or close the second valve port 115. In the illustrated example, the differential pressure valve plug 1324 is integrated onto the differential pressure diaphragm assembly 1322. Figure 1As shown, the upper part of the differential pressure diaphragm assembly 1322 is the second valve port 115, and the lower part is the back pressure chamber 1321. The upper part of the differential pressure diaphragm assembly 1322 is subjected to pressure from the first valve chamber 112. By adjusting the differential pressure force on the upper and lower sides of the differential pressure diaphragm assembly 1322, the 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 differential pressure elastic element 1323 is provided below the differential pressure diaphragm assembly 1322 to realize the reset of the differential pressure valve plug 1324.

[0098] The pilot valve assembly 131 can be used to adjust the pressure on both sides of the differential pressure diaphragm group 1322 of the differential pressure valve assembly 132, so as to realize the opening of the second valve port 115 and the adjustment of the opening degree.

[0099] In application, when the first valve port 114 is opened by the solenoid valve 12, the gas flows in from the intake channel 111, enters the first valve chamber 112 through the first valve port 114, and the gas entering the first valve chamber 112 can flow into the second flow channel 117.

[0100] When the pilot valve assembly 131 is not energized, the pilot valve assembly 131 cuts off the second flow channel 117, that is, the gas flowing into the second flow channel 117 cannot enter the second valve chamber 113. However, the gas flowing into the second flow channel 117 can enter the back pressure chamber 1321 of the differential pressure valve assembly 132 through the third flow channel 118 connected to it. At this time, the upper pressure and lower pressure of the differential pressure diaphragm assembly 1322 of the differential pressure valve assembly 132 are balanced. Under the action of the differential pressure elastic element 1323, the differential pressure diaphragm assembly 1322 drives the differential pressure valve plug 1324 to remain in the closed position of closing the second valve port 115.

[0101] When the pilot valve assembly 131 is energized, it opens the second flow channel 117. At this time, part of the gas flowing into the second flow channel 117 can flow into the second valve chamber 113, and the other part can flow into the back pressure chamber 1321 of the differential pressure valve assembly 132 through the third flow channel 118. In this way, a pressure difference can be established on both sides of the differential pressure diaphragm assembly 1322 of the differential pressure valve assembly 132 to drive the 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.

[0102] In a specific implementation, a pilot valve port can be provided on the second flow channel 117, and the pilot valve assembly 131 can open or close the pilot valve port to open or close the second flow channel 117.

[0103] In this embodiment, the gas valve 10 also includes a pressure regulating valve 14, which is located on the second flow channel 117 and downstream of the pilot valve assembly 131. That is, the gas entering the second flow channel 117 flows through the pilot valve assembly 131 and then flows to the pressure regulating valve 14. After being regulated and stabilized by the pressure regulating valve 14, the gas flows into the second valve chamber 113 and finally flows into the main furnace burner 50 from the gas outlet 1131.

[0104] The pressure regulating valve 14 can be set to adjust the gas flow rate, so that the differential pressure valve assembly 132 maintains a certain opening to meet the outlet pressure setting requirements.

[0105] In a specific implementation, the inlet end of the second flow channel 117 is provided with a normally open throttling orifice 1171 to regulate the amount of gas flowing into the second flow channel 117. The normally open throttling orifice 1171 can be a separate structural component assembled with the valve body 11, or it can be directly machined on the valve body 11.

[0106] The following is combined Figure 10 This illustrates a practical application scenario for the gas valve 10. Please refer to [link / reference]. Figure 10 , Figure 10 This is a cross-sectional schematic diagram of a gas control system provided in one embodiment of this application.

[0107] like Figure 10 As shown, the gas control system includes the aforementioned gas valve 10, electronic controller 20, thermopile 30, constant flame burner 40, and 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. After the constant flame burner 40 is ignited, the thermopile 30 can be heated to generate electricity.

[0108] In this embodiment, the thermopile 30 provided in the constant flame burner 40 can supply power to the electronic controller 20, solenoid valve 12 and second valve group 13 of the gas control system.

[0109] It should be pointed out again that, as mentioned above, the solenoid valve 12, due to its structural design, can reduce power consumption. Therefore, when used in a gas control system, the electrical energy generated by the thermopile 30 can meet the power supply needs of multiple electrical components in the gas control system, thus achieving energy-saving effects.

[0110] The first flow channel 116 of the gas valve 10 can be connected to the open flame burner 40 through the capillary tube 100, and the gas outlet 1131 of the second valve chamber 113 can be connected to the main furnace burner 50 through the gas pipeline.

[0111] In practical applications, the user can manually open the solenoid valve 12 to open the first gas supply path, allowing gas to be supplied to the constant flame burner 40. The user then ignites the constant flame burner 40, which heats up the thermopile 30 located in the constant flame burner 40 to generate electricity, which is then supplied to the solenoid valve 12, keeping the solenoid valve 12 energized. The first valve port 114 remains open, providing 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 solenoid valve 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.

[0112] The gas control system utilizes a combination of a constant-flame burner 40 and a thermoelectric stack 30 to achieve self-generation. The solenoid valve 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 open or close 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 uses 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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 solenoid valve 12.

[0117] 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 solenoid valve 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 support member 1263 of the solenoid valve 12 via the connecting rod 91 to manually open the solenoid valve 12. Rotating the knob 90 switches 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 the desired set temperature zone command to the electronic controller 20.

[0118] 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 solenoid valve for a gas valve, the gas valve including a valve port, characterized in that, The solenoid valve includes a housing, a first magnetic conductor, a second magnetic conductor, a third magnetic conductor, a coil, a valve stem, a seal, and a valve-closing elastic element; The first magnetic conductor and the second magnetic conductor are at least partially fixed inside the housing, and the third magnetic conductor is located inside the housing. The first magnetic conductor includes a bottom wall portion and a side wall portion fixed to the outer edge of the bottom wall portion. The second magnetic conductor is fixedly connected to the bottom wall portion. The coil is sleeved on the second magnetic conductor and is located inside the side wall portion. The sealing element and the third magnetic conductor are respectively connected to both ends of the valve stem. The valve stem is slidably inserted into the housing to move the sealing element closer to or away from the valve port of the gas valve. The valve closing elastic element is disposed between the sealing element and the housing. The coil is energized, the third magnetic conductor is in contact with the first magnetic conductor and the second magnetic conductor, and a closed annular magnetic flux is formed between the third magnetic conductor, the first magnetic conductor and the second magnetic conductor, and the sealing element is in the open position away from the valve port.

2. The solenoid valve according to claim 1, characterized in that, The valve stem is inserted into the third magnetic conductor, which is axially limited and circumferentially gapped with the valve stem.

3. The solenoid valve according to claim 1, characterized in that, The housing includes an outer shell and a base. The outer shell is fixedly connected to the base. The base supports the first magnetic conductor. The outer shell is fitted over the first magnetic conductor. The second magnetic conductor passes through the bottom wall and is fixedly connected to the base. The second magnetic conductor has a downward limiting surface that abuts against the bottom wall.

4. The solenoid valve according to claim 3, characterized in that, The sidewall portion is a ring-shaped structure; or, the sidewall portion includes a first sidewall segment and a second sidewall segment, the first sidewall segment and the second sidewall segment are located on both sides of the second magnetic conductor, along the circumferential direction, and there is a gap between the first sidewall segment and the second sidewall segment, and the wiring terminal of the coil is led out from the gap and injection molded into the base.

5. The solenoid valve according to claim 4, characterized in that, The base is made of plastic, and a metal bushing is provided between the base and the second magnetic conductor. The metal bushing, the base, and the terminal block are injection molded into a single structure.

6. The solenoid valve according to claim 5, characterized in that, A first sealing ring is provided between the second magnetic conductor and the bushing.

7. The solenoid valve according to any one of claims 1-6, characterized in that, The housing includes a guide housing portion, the valve stem is inserted into the guide housing portion, and the outer peripheral wall of the valve stem slides in fit with the inner wall of the guide housing portion.

8. The solenoid valve according to claim 7, characterized in that, The valve stem is connected to a support member at one end extending out of the guide housing, and the sealing member is fixedly connected to the side of the support member facing away from the housing. The housing also includes a top shell portion, which is fixedly connected to the end of the guide shell portion away from the support member, and the valve-closing elastic element is disposed between the top shell portion and the support member.

9. The solenoid valve according to claim 8, characterized in that, The valve stem has a ball head at its end, and the support is riveted to the ball head with a clearance fit.

10. A gas valve, characterized in that, The device includes a valve body and a solenoid valve, wherein the solenoid valve is the solenoid valve according to any one of claims 1-9, the valve body has an air inlet channel and a first valve chamber, the air inlet channel is connected to the first valve chamber through a first valve port, the solenoid valve is used to open or close the first valve port, and the housing is fixedly connected to the valve body.

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