Gas valve and gas control system

Abstract

A gas valve (10), comprising a valve body (11), a first valve set (12) and a second valve set (13). The valve body has a first gas supply path and a second gas supply path, wherein the first gas supply path is configured to provide gas for a pilot burner (40), and the second gas supply path is configured to provide gas for a main burner (50); and the first gas supply path is provided with a first valve port portion (114), and the second gas supply path is provided with a first valve port portion (114) and a second valve port portion (115). The first valve set (12) and the second valve set (13) are configured to open and close the first valve port portion (114) and the second valve port portion (115), respectively. The first valve set (12) is a thermocouple solenoid valve, and comprises a coil (125), at least two magnetic conductors and a sealing member (1262), wherein at least one magnetic conductor is fixedly connected to the valve body (11), and the other magnetic conductor is connected to the sealing member (1262) and can drive the sealing member (1262) to move toward or away from the first valve port portion (114); when the coil (125) is in an energized state, the magnetic conductor fixed to the sealing member (1262) is attracted to the magnetic conductor fixedly connected to the valve body; and the sealing member (1262) is located at a valve opening position away from the first valve port portion (114). The gas valve has a simple structure and high reliability. A gas control system is further comprised.

Description

A gas valve and gas control system

[0001] This application claims priority to Chinese Patent Application No. 202411961451.1, filed on December 27, 2024, entitled "A Gas Valve and Gas Control System", the entire contents of which are incorporated herein by reference. Technical Field

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

[0003] In related technologies, the electronic intelligent gas valve has a constant flame valve at the valve body inlet. By manually opening the constant flame valve, gas can flow into the valve chamber between the first main valve and the second main valve. After pressure regulation and stabilization, it is delivered to the constant flame burner for combustion. The constant flame burner is equipped with a thermopile. After being heated, the thermopile generates electricity and supplies electrical energy to the electronic controller. The electronic controller controls the opening of the pilot valve of the first main valve, thereby opening the differential pressure valve of the first main valve. Gas is continuously supplied to the constant flame burner through the first main valve. The electronic controller controls the opening or closing of the second main valve according to the actual temperature of the heated medium to supply gas to the main furnace burner. The second main valve has a similar structure to the first main valve, both of which are differential pressure valves.

[0004] The aforementioned electronic intelligent gas valves have a large number of valves, and each valve has many sealing points, resulting in a complex structure, low reliability, and a tendency to cause gas leaks. Summary of the Invention

[0005] The purpose of this application is to provide a gas valve and a gas control system. The gas valve has a relatively small number of valves, a simple structure, and is conducive to improving operational reliability.

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

[0007] The valve body has a first gas supply path and a second gas supply path. The first gas supply path is used to supply gas to the open flame burner, and the second gas supply path is used to supply gas to the main furnace burner.

[0008] The first gas supply path is provided with a first valve port, and the second gas 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.

[0009] The first valve assembly is a thermocouple solenoid valve. The first valve assembly includes a coil, at least two magnetic conductors, and a sealing element. At least one of the magnetic conductors is fixedly connected to the valve body, and the other magnetic conductor is connected to the sealing element and can drive the sealing element to move closer to or away from the first valve port. When the coil is energized, the magnetic conductor fixed to the sealing element and the magnetic conductor fixedly connected to the valve body are attracted together. The sealing element is in the open position away from the first valve port.

[0010] This application also provides a gas control system, including a gas valve, an electronic controller, a thermopile, 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;

[0011] The open flame burner is located beside the main furnace burner, and the thermopile is located on the open flame burner. The thermopile is used to supply power to the electronic controller, the first valve group and the second valve group.

[0012] The electronic controller is used to control the on / off state of the power supply circuit of the first valve group, and also to control the on / off state of the power supply circuit of the second valve group.

[0013] The gas valve provided in this application can be used in a gas control system. The gas valve's structure allows for the opening or closing of the gas supply path to the open flame burner using only the first valve group. This simplifies the valve body structure, reduces the number of valves, and helps save costs and improve the reliability of the gas valve. Attached Figure Description

[0014] Figure 1 is a cross-sectional schematic diagram of the gas control system provided in an embodiment of this application;

[0015] Figure 2 is a cross-sectional schematic diagram of the gas valve provided in one embodiment of this application;

[0016] Figure 3 is a schematic diagram of the structure of the first valve group in Figure 2;

[0017] Figure 4 is a schematic diagram of the first valve group shown in Figure 3 in the closed state.

[0018] Figure 5 is a schematic diagram of the first valve group shown in Figure 3 in the open valve state;

[0019] Figure 6 is a partial structural schematic diagram of the first valve group shown in Figure 3;

[0020] Figure 7 is a schematic diagram of the magnetic flux of the first valve group shown in Figure 6 after it is energized.

[0021] Figure 8 is a schematic diagram of the magnetic flux after the first valve group is energized in a modified example;

[0022] Figure 9 is a magnified view of part A in Figure 2;

[0023] Figure 10 is a partial schematic diagram of the replacement scheme at the joint between the connecting rod and the valve body.

[0024] Explanation of reference numerals in the attached drawings: Gas valve 10, electronic controller 20, thermopile 30, normally open flame burner 40, main furnace burner 50, igniter 60, temperature sensor 70, water tank 80, knob 90, connecting rod 91, capillary tube 100; Valve body 11, air inlet channel 111, first 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, normally open throttling orifice 1171, third flow channel 118, connecting hole 1191, mounting groove 1192, second sealing ring 1193, diaphragm 1193', end cap 1194; First valve assembly 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; 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; pressure regulating and stabilizing valve 14, constant open flame pressure stabilizing device 16. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the specific embodiments of the present application will be described below with reference to the accompanying drawings.

[0026] 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.

[0027] 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.

[0028] Please refer to Figures 1 and 2. Figure 1 is a cross-sectional schematic diagram of the gas control system in one embodiment of this application; Figure 2 is a cross-sectional schematic diagram of the gas valve in one embodiment of this application. The dashed lines in Figures 1 and 2 indicate structures that cannot be visually displayed. The double-dotted lines in Figure 1 are schematic diagrams of control circuits or electrical control circuits.

[0029] In this embodiment, the gas control system includes a gas valve 10, an electronic controller 20, 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 its flame 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.

[0030] 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 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.

[0031] 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.

[0032] 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.

[0033] 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 of the gas control system. The electronic controller 20 can be used to control the on / off state of the power supply circuit of the first valve group 12, and also to control the on / off state of the power supply circuit of the second valve group 13.

[0034] In the gas valve 10 of this gas control system, the first valve group 12 is a thermocouple solenoid valve. The structure of the first valve group 12 is configured such that it can remain in the open position of the first valve port 114 when energized, and it can be manually opened. The first valve group 12, as a single valve component, can control the opening or closing of the first gas supply path to the constant flame burner 40. This simplifies the structure of the gas valve 10, reduces the number of valve components and sealing parts, lowers the probability of gas leakage, and thus improves the operational reliability of the gas valve.

[0035] Please refer to Figures 3 to 5. Figure 3 is a structural schematic diagram of the first valve group in Figure 2; Figure 4 is a structural schematic diagram of the first valve group shown in Figure 3 in the closed state; and Figure 5 is a structural schematic diagram of the first valve group shown in Figure 3 in the open state.

[0036] In some embodiments, the first valve assembly 12 includes a coil 125, at least two magnetic conductors, and a seal 1262. At least one magnetic conductor is fixedly connected to the valve body 11 of the gas valve, and the other magnetic conductor is connected to the seal 1262 and can move the seal 1262 closer to or away from the first valve port 114. The first valve assembly 12 is configured such that when the coil 125 is energized, the magnetic conductor fixedly connected to the seal 1262 and the magnetic conductor fixedly connected to the valve body 11 are attracted together, and the seal 1262 is in an open position away from the first valve port 114.

[0037] The first valve assembly 12 uses the attraction of at least two magnetic conductors to keep the seal 1262 in the open position of the first valve port 114, which helps to reduce current consumption.

[0038] In this embodiment, the first valve group 12 is provided with three magnetic conductors, referred to as the first magnetic conductor 122, the second magnetic conductor 123, and the third magnetic conductor 124, respectively. The first valve group 12 also includes a housing 121 and a valve stem 1261.

[0039] 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.

[0040] The seal 1262 and the third magnetic conductor 124 are connected by the valve stem 1261. 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.

[0041] 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. The seal 1262 is in the open position, away from the first valve port 114. The closed annular magnetic flux is indicated by a dashed line in Figure 5. It can be understood that after coil 125 is energized, a magnetic attraction is generated between the third magnetic conductor 124 and the first and second magnetic conductors 122 and 123. Under the action of this magnetic attraction, the third magnetic conductor 124 moves closer to the first and second magnetic conductors 122 and 123, causing the valve stem 1261 and the seal 1262 to move away from the first valve port 114.

[0042] The first valve assembly 12 can be connected to the valve body 11 of the gas valve 10 via the housing 121. At least a portion of the first valve assembly 12 is located inside the valve body 11 to cooperate with the first valve port 114 of the valve body 11. In the embodiment shown in FIG2, the first valve assembly 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.

[0043] The first valve group 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 setting 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 ring 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 relatively reduced, and the energy-saving effect can be achieved. Thus, the first valve group 12 can work under low voltage and current conditions or in working environments with small power distribution.

[0044] The first valve group 12 is applied to the gas valve 10. The gas valve 10 only needs to provide a low amount of electrical energy to the first valve group 12 to keep the first valve group 12 in the open position of 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 gas valve 10 control system to operate by being powered only by the thermopile.

[0045] 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 first valve assembly 12.

[0046] For example, the second magnetic conductor 123 can be made of iron core.

[0047] In this embodiment, the first valve assembly 12 may further include a valve-closing elastic element 1264, which is 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.

[0048] 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 coil 125 is accidentally de-energized, the first valve group 12 can be reset to the valve closing position, cutting off the gas supply to the constant flame burner 40 in the gas valve 10, thus ensuring safety.

[0049] Please refer to Figures 6 and 7 together. Figure 6 is a partial structural schematic diagram of the first valve group shown in Figure 3; Figure 7 is a magnetic flux schematic diagram of the first valve group shown in Figure 6 after it is energized.

[0050] In this embodiment, the 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. 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 structures of the first valve assembly 12 with the housing 121.

[0051] The outer casing 1211 and the base 1212 can be fixed by means of snap-fit ​​or screw connection.

[0052] 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.

[0053] 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.

[0054] For example, as shown in FIG4, the second magnetic conductor 123 has a downward 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, since 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.

[0055] In other implementations, the first magnetic conductor 122 can also be fixed to the base 1212 using other connection methods.

[0056] In one implementation, the second magnet 123 and the base 1212 can be fixed by riveting.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In a specific implementation, 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 first valve assembly 12.

[0062] As shown in Figure 6, 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.

[0063] 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.

[0064] After the side wall portion 1222 of the first magnetic conductor 122 is set as described above, two closed annular magnetic fluxes are formed as shown by the dashed lines in Figure 7. Each closed annular magnetic flux has an overall roughly arc-shaped structure.

[0065] 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.

[0066] 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 continuous in the circumferential direction and generally has an annular structure. This can be understood with reference to Figure 8, in which the dotted line illustrates the magnetic flux form when the sidewall portion 1222 of the first magnetic conductor 122 is a circumferentially continuous cylindrical structure.

[0067] In this embodiment, the housing 121 may further include a guide housing portion 12111, into which the valve stem 1261 is inserted, and the outer peripheral wall of the valve stem 1261 slides in conjunction with the inner wall of the guide housing portion 12111. Thus, the guide housing portion 12111 can guide the movement of the valve stem 1261, ensuring the sealing effect of the sealing member 1262 on the first valve port portion 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.

[0068] 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.

[0069] In this embodiment, a support member 1263 is connected to one end of the valve stem 1261 that extends out of the guide housing 12111, and a sealing member 1262 is disposed on the side of the support member 1263 facing away from the guide housing 12111.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In the specific implementation, the valve stem 1261 is inserted into the third magnetic conductor 124. The third magnetic conductor 124 is axially limited and connected to the valve stem 1261, and circumferentially gap connected.

[0077] 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.

[0078] 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).

[0079] In some embodiments, as shown in FIG2, the outer shell 1211 of the housing 121 of the first valve assembly 12 can be substantially located inside the valve body 11, and the base 1212 is sealed and fixed to the valve body 11.

[0080] In other embodiments, as shown in Figures 4 and 5, the first valve assembly 12 may further include a head 129, which is fixed below the base 1212 of the housing 121. The first valve assembly 12 can be fixedly connected to the valve body 11 of the gas valve 10 through the head 129.

[0081] In other embodiments, the first valve assembly 12 may have other structural forms besides the specific structural form shown in the figure above. For example, the first valve assembly 12 may include only two magnetic conductors. One magnetic conductor is fixedly connected to the valve body 11, and the other magnetic conductor can drive the sealing element to move relatively closer to or away from the first valve port 114.

[0082] In the application environment of the gas valve 10, the first valve group 12 can 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 downward 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 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 valve group 12, energizing its coil 125. In this way, the first valve group 12 can be kept in the open position with the first valve port 114 open.

[0083] As shown in Figure 2, 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 first valve assembly 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 also refer to Figure 9, which is a magnified view of part A in Figure 2.

[0087] In one implementation of the above-mentioned sealing structure, referring to Figures 2 and 9, the valve body 11 of the gas valve 10 has a connecting hole 1191. 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 restrict the position of the second sealing ring 1193.

[0088] Please also refer to Figure 10, which is a partial schematic diagram of the replacement scheme at the joint 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 first valve assembly 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 first valve group 12, or it can be fixedly connected to the support member 1263.

[0091] Please refer to Figures 1 and 2 again. The gas valve 10 includes a valve body 11, and the aforementioned first gas supply path and second gas supply path can be basically formed on the valve body 11.

[0092] As shown in Figure 2, 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 40. 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 50.

[0093] As shown in Figure 1, the other end of the first flow channel 116 can be connected to the open flame burner 40 via a capillary tube 100. The gas outlet 1131 of the second valve chamber 113 can be connected to the main furnace burner 50 via a gas pipeline.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] The valve body 11 also has a second flow channel 117 and a third flow channel 118.

[0098] 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.

[0099] 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.

[0100] 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 on the differential pressure diaphragm assembly 1322. As shown in Figure 2, the second valve port 115 is above the differential pressure diaphragm assembly 1322, and the back pressure chamber 1321 is below it. 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 reset the differential pressure valve plug 1324.

[0101] 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.

[0102] In application, when the first valve port 114 is opened by the first valve group 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.

[0103] 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.

[0104] 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 50.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] Referring again to Figures 1 and 2, after the gas control system is equipped with the aforementioned gas valve 10, in actual application, the user can manually open the first 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, which is then supplied to the first valve group 12, so that the first valve group 12 is in an energized state, and the first valve port 114 remains in an 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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 valve assembly 12.

[0115] 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 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 support member 1263 of the first valve group 12 via the connecting rod 91 to manually open the first valve group 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 a desired set temperature zone command to the electronic controller 20.

[0116] 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 gas supply path and a second gas supply path. The first gas supply path is used to supply gas to the open flame burner, and the second gas supply path is used to supply gas to the main furnace burner. The first gas supply path is provided with a first valve port, and the second gas 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 assembly is a thermocouple solenoid valve. The first valve assembly includes a coil, at least two magnetic conductors, and a sealing element. At least one of the magnetic conductors is fixedly connected to the valve body, and the other magnetic conductor is connected to the sealing element and can drive the sealing element to move closer to or away from the first valve port. When the coil is energized, the magnetic conductor fixed to the sealing element and the magnetic conductor fixedly connected to the valve body are attracted together. The sealing element is in the open position away from the first valve port.

2. The gas valve according to claim 1, characterized in that, The first valve assembly includes a housing, three magnetic conductors, and a valve stem; the housing is fixedly connected to the valve body; the three magnetic conductors are a first magnetic conductor, a second magnetic conductor, and a third magnetic conductor. 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 drive the sealing element closer to or away from the first valve port. 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 first valve port.

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

4. The gas valve according to claim 2, 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.

5. The gas valve according to claim 4, 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.

6. The gas valve according to claim 2, 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.

7. The gas valve according to claim 6, 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.

8. The gas valve according to any one of claims 1-7, characterized in that, The valve body has an air inlet channel, a first valve chamber, a second valve chamber, and a first flow channel; The air intake channel is connected to the first valve chamber through the first valve port, and one end of the first flow channel is connected to the first valve chamber, while the other end is used to connect to the constant open flame burner. A constant flame pressure stabilizing device is provided between the first valve chamber and the first flow channel; The first valve chamber is connected to the second valve chamber through the second valve port, and the gas outlet of the second valve chamber is used to connect to the main furnace burner; The first air supply path includes the air intake 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.

9. The gas valve according to claim 8, characterized in that, The second valve assembly includes a pilot valve assembly and a differential pressure valve assembly, and the second valve port is opened or closed by the differential pressure valve assembly; The valve body has a second flow channel and a third flow channel. The inlet end of the second flow channel is connected to the first valve cavity, and the outlet end of the second flow channel is connected to the second valve cavity. The pilot valve assembly is located downstream of the inlet end of the second flow channel and is used to open or close the second flow channel. The inlet end of the third flow channel is connected to the second flow channel, the outlet end of the third flow channel is connected to the back pressure chamber of the differential pressure valve assembly, and the inlet end of the third flow channel is located between the inlet end of the second flow channel and the pilot valve assembly.

10. The gas valve according to claim 9, characterized in that, The gas valve also includes a pressure regulating valve, which is located on the second flow channel and downstream of the pilot valve assembly.

11. A gas control system, characterized in that, It includes a gas valve, an electronic controller, a thermopile, 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 open flame burner is located beside the main furnace burner, and the thermopile is located on the open flame burner. The thermopile is used to supply power to the electronic controller, the first valve group and the second valve group. The electronic controller is used to control the on / off state of the power supply circuit of the first valve group, and also to control the on / off state of the power supply circuit of the second valve group.

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