A gas valve

Abstract

This invention discloses a gas valve, comprising a valve body, a first gas valve, and a second gas valve. The valve body has a first chamber, a second chamber, and a third chamber. The first chamber has an inlet, the second chamber has an ignition outlet, and the third chamber has an outlet. The first gas valve switches the connection between the first and second chambers, and the second gas valve switches the connection between the second and third chambers. The valve body also has a bypass passage connecting the first and second chambers. It further includes a pilot valve, which comprises a housing, a pilot valve plate, a return spring, and an electromagnetic mechanism. The electromagnetic mechanism is installed within the housing, and the pilot valve plate is movably installed within the bypass passage, having a first state and a second state. In the first state, the pilot valve plate cuts off the bypass passage, disconnecting the first and second chambers. This invention avoids the electromagnetic mechanism of the pilot valve being corroded by the gas, thus ensuring that the pilot valve can maintain stable and reliable operation over a long period.

Description

Technical Field

[0001] This invention relates to valves, and more specifically, to a gas valve. Background Technology

[0002] A gas valve is a fuel control device for gas appliances (such as water heaters, fireplaces, or other gas appliances). By switching the gas valve on and off, the gas supply to the appliance can be controlled, thus controlling the combustion process. Some gas valve control systems use a thermopile to achieve thermoelectric conversion. When the contact points of the two wires in the thermopile are at different temperatures, a small voltage difference is generated. In a gas valve system, this small potential difference can be used to drive an electromagnetic coil, generating a magnetic field that controls the flow of gas through the valve, thus switching the gas flow. When the flame is extinguished, the thermoelectric effect of the thermopile disappears, the electromagnetic valve coil loses its driving current, and the valve closes, shutting off the gas and ensuring the safety of the gas appliance.

[0003] Current gas valve equipment typically uses two solenoid valves to control the flow of gas within the valve. During operation:

[0004] 1. Initial ignition: The user presses the gas valve knob to open the first valve (ignition valve), and the gas flows to the igniter and is ignited by the ignition source;

[0005] 2. Ignition Maintenance: The ignition flame heats a thermoelectric device (such as a thermoelectric reactor) to generate a millivolt-level potential, which powers the gas valve control panel. The control panel then energizes the first valve, keeping it open and allowing the user to release the knob to sustain the ignition flame.

[0006] 3. Main Burner Control: A temperature sensor monitors the water temperature in the tank and feeds it back to the control system. The gas valve controller, based on the set water temperature (adjustable via a potentiometer connected to a knob) and the actual water temperature, controls the opening and closing of the second valve to switch the gas flow to the main burner, thereby heating the water tank to the set temperature.

[0007] Gas fuels contain hydrogen sulfide (H2S) and other corrosive impurities (such as carbon dioxide, organic sulfur compounds, and halides). The solenoid coil in a gas valve is exposed to this gas environment, and these corrosive impurities can corrode the coil, especially at the solder joints. Corrosion of the solenoid coil can lead to the formation of copper sulfide (Cu2S), which has poor conductivity, causing increased coil resistance and even insulation failure. Ultimately, this reduces the electromagnetic force of the solenoid coil, severely impacting the lifespan of the gas valve.

[0008] The second solenoid valve's solenoid coil is only exposed to the gas environment when the gas equipment is working, so it is less affected by corrosion. However, the components of the first solenoid valve are continuously exposed to the gas environment, so they are more susceptible to corrosion. Long-term corrosion can easily lead to a decrease in the electromagnetic driving force of the first solenoid valve, which may be insufficient to drive the normal operation of the first solenoid valve, directly affecting the stability and reliability of the gas valve.

[0009] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0010] The purpose of this invention is to overcome the shortcomings of the prior art and provide a gas valve.

[0011] To achieve the above objectives, the present invention adopts the following technical solution: a gas valve, comprising a valve body, a first gas valve, and a second gas valve, wherein the valve body is provided with a first chamber, a second chamber, and a third chamber, the first chamber is provided with an air inlet, the second chamber is provided with an ignition outlet, and the third chamber is provided with an air outlet; the first gas valve is used to switch the first chamber and the second chamber on / off, and the second gas valve is used to switch the second chamber and the third chamber on / off;

[0012] The valve body is also provided with a bypass channel that can connect the first chamber and the second chamber;

[0013] It also includes a pilot valve, which includes a housing, a pilot valve plate, a return spring, and an electromagnetic mechanism. The pilot valve plate is movably installed in the bypass flow channel and has a first state and a second state. In the first state, the pilot valve plate cuts off the bypass flow channel, and the first chamber and the second chamber are disconnected. In the second state, the pilot valve plate opens the bypass flow channel, and the first chamber and the second chamber are connected.

[0014] The reset spring elastically maintains the pilot valve plate in the first state, and the electromagnetic mechanism, when energized, can overcome the reset spring maintaining the pilot valve plate in the second state.

[0015] The present invention is further configured such that the electromagnetic mechanism is installed in the inner cavity of the housing, and the inner cavity of the housing is sealed to the bypass channel.

[0016] The present invention is further configured such that the pilot actuator valve also includes a valve stem, the housing has a through hole on the side facing the bypass flow channel, one end of the valve stem is located inside the housing, and the other end extends through the through hole into the bypass flow channel and is fitted with a pilot valve plate, and the valve stem and the through hole are sealed together.

[0017] The present invention is further configured such that the electromagnetic mechanism includes a stator and a mover that are magnetically attracted to each other, the stator being fixed inside the housing and the mover being mounted on the valve stem;

[0018] In the first state, the stator and the mover move away from each other; in the second state, the stator and the mover move closer together.

[0019] The present invention is further configured such that the pilot actuator valve further includes an electrical terminal, one end of which extends into the housing and is electrically connected to the electromagnetic mechanism, and the other end extends out of the housing, wherein the electrical terminal and the housing are mutually sealed.

[0020] The present invention is further configured such that the reset spring is located outside the housing and elastically presses against the housing and the pilot valve plate.

[0021] The invention is further configured to include an operating switch and a linkage, wherein the operating switch includes a movable block that can be elastically pressed, and the movable block is linked to the pilot valve plate through the linkage; the movable block has a pressed state and a reset state, and in the pressed state, the movable block drives the pilot valve plate to move to the second state through the linkage.

[0022] The present invention is further configured such that a pilot valve port is provided between the bypass channel and the second chamber. In a first state, the pilot valve plate closes the pilot valve port, and in a second state, the pilot valve plate opens the pilot valve port.

[0023] The present invention is further configured such that the linkage is rotatably mounted in the second chamber and has a first linkage part and a second linkage part. In the pressed state, the movable block can abut against the first linkage part, and the second linkage part extends into the pilot valve port and abuts against the pilot valve plate.

[0024] The present invention is further configured such that the operating switch includes a sealing diaphragm, a second return spring, and a knob shaft, the knob shaft being mounted on the valve body and capable of axial sliding and rotational adjustment;

[0025] The invention is further configured such that one end of the movable block is located inside the second chamber, and the other end extends out of the valve body and is axially opposite to the knob shaft; the movable block and the second chamber are sealed by a sealing diaphragm; the second reset spring elastically acts on the movable block in the direction of the knob shaft.

[0026] The present invention is further configured such that a first valve port is provided between the first chamber and the second chamber, and the first air valve is located on one side of the first chamber at the first valve port.

[0027] A first diaphragm is installed on the outer periphery of the first air valve, with one side of the first diaphragm facing the first chamber and the other side forming a first balance chamber; the bypass channel is connected to the first balance chamber through a first connecting hole; the first chamber is connected to the bypass channel through a first throttling hole.

[0028] In summary, the present invention has the following beneficial effects:

[0029] The sealing rubber on the pilot valve plate of the pilot actuator valve is constantly immersed in the gas environment. The humid environment of the gas corrodes the sealing rubber, causing adhesion forces and leading to valve sticking, especially after prolonged periods of inactivity. Existing technologies using a solenoid valve driven by a millivolt voltage generated by a thermopile are insufficient to overcome this adhesion force when valve sticking occurs, resulting in failure to open the valve. This new solution uses a linkage mechanism to manually actuate the pilot valve plate, effectively overcoming the sticking force and preventing valve sticking from affecting normal equipment operation. This ensures the pilot actuator valve can open, improving product reliability.

[0030] By installing a linkage component within the valve body, the linkage component can create a linkage between the operating switch and the pilot valve plate of the pilot actuator, enabling direct on / off control between the first and second chambers via the pilot actuator. When the operating switch is pressed, the linkage component can drive the pilot valve plate of the pilot actuator, opening the pilot valve port. Simultaneously, the electromagnetic mechanism in the pilot actuator can be adjusted to a second state, allowing the stator and mover to approach each other, a state conducive to magnetic attraction.

[0031] By installing the electromagnetic mechanism of the pilot actuator (i.e., the first solenoid valve) of the gas valve inside the housing, and sealing the housing with the bypass flow channel, the electromagnetic mechanism can be sealed and separated from the chamber inside the valve body, and the electromagnetic mechanism can be separated from the gas environment inside the valve body. This prevents the gas from directly contacting the electromagnetic mechanism and avoids the electromagnetic mechanism from being corroded by the gas, thereby ensuring that the pilot actuator can maintain stable and reliable operation for a long time.

[0032] In a pilot-operated valve, the valve stem and the housing are connected by a sliding seal. A sealing element is installed at the position where the valve stem passes through the housing to achieve a sliding seal, ensuring that gas cross-flow between the bypass channel and the inner cavity of the housing is avoided during the extension and retraction of the valve stem. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a gas valve in this embodiment;

[0034] Figure 2 This is a schematic diagram of the pilot valve, linkage, and operating switch in this embodiment;

[0035] Figure 3 This is a schematic diagram of the pilot valve in its first state in this embodiment;

[0036] Figure 4 This is a schematic diagram of the second state of the pilot valve in this embodiment;

[0037] Figure 5 This is a schematic diagram of the linkage component in this embodiment;

[0038] Figure 6 This is a cross-sectional view of the reset state of the active block in this embodiment;

[0039] Figure 7 This is a cross-sectional view of the pilot valve in the first state in this embodiment;

[0040] Figure 8 This is a cross-sectional view of the pressed state of the active block in this embodiment;

[0041] Figure 9 This is a cross-sectional view of the pilot valve in the second state in this embodiment;

[0042] Figure 10 A perspective view of a gas valve in this embodiment;

[0043] Figure 11 This embodiment shows a perspective view of a gas valve with its outer casing removed;

[0044] Figure 12 This is a schematic diagram of the first working state of the gas valve in this embodiment;

[0045] Figure 13 This is a schematic diagram of the second operating state of the gas valve in this embodiment;

[0046] Figure 14 This is a schematic diagram of the third operating state of the gas valve in this embodiment;

[0047] Figure 15 This is a schematic diagram of the fourth operating state of the gas valve in this embodiment.

[0048] Reference numerals: Valve body 100; First chamber 101; Second chamber 102; Third chamber 103; Air inlet 104; Bypass passage 105; First throttling orifice 106; First diaphragm 107; First air valve 108; First balance chamber 109; First connecting hole 110; First spring 111; First valve port 112; Second throttling orifice 113; Ignition outlet 114; Operating switch 115; Knob shaft 1151; Rotary potentiometer 1152; Moving block 116; Second return spring 1161; Sealing diaphragm 117; Pilot valve 118; Pilot valve port 119; Linkage element 120; First linkage part 121 Second linkage part 122; Second valve port 123; Second air valve 124; Second spring 125; Second balance chamber 126; Second diaphragm 127; Electric servo valve 128; Second connecting hole 129; Third connecting hole 130; Electric valve port 131; Bypass chamber 132; Air outlet 133; Housing 200; Stator 201; Valve stem 202; Seal 1 203; Pilot valve plate 204; Return spring 1 205; Mover 206; Electrical terminal 207; Seal 2 208; Half-shell 1 209; Half-shell 2 210; Seal 3 211; Electromagnetic mechanism 212; Through hole 213; Piezoelectric igniter 300. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] This embodiment discloses a gas valve, referring to... Figures 1-15 As shown, the gas valve includes a valve body 100, a first gas valve 108, and a second gas valve 124. The entire gas valve is supported by the valve body 100, which contains a first chamber 101, a second chamber 102, and a third chamber 103. The first chamber 101 has an air inlet 104 connected to a gas input pipe for gas input. The second chamber 102 has an ignition outlet 114, through which a small stream of gas is output to the igniter for ignition in the gas equipment. The third chamber 103 has an air outlet 133 connected to the main burner for combustion in the gas equipment.

[0051] The first gas valve 108 is installed between the first chamber 101 and the second chamber 102, allowing the first chamber 101 and the second chamber 102 to be switched on and off. The second gas valve 124 is installed between the second chamber 102 and the third chamber 103, allowing the second chamber 102 and the third chamber 103 to be switched on and off. The first gas valve 108 and the second gas valve 124 form two valves in series during the gas delivery process, from the inlet 104 to the outlet 133. Both valves need to be opened simultaneously to allow gas to be output to the main burner.

[0052] Reference Figure 1 , Figure 2 As shown, the valve body 100 is also provided with a bypass channel 105, a first throttling orifice 106 is opened between the bypass channel 105 and the first chamber 101, and a pilot valve port 119 is opened between the bypass channel 105 and the second chamber 102, which can realize the connection between the first chamber 101 and the second chamber 102.

[0053] At the pilot valve port 119, the pilot actuator 118 can control the opening and closing of the bypass flow channel 105. The pilot actuator 118 can control the pilot valve port 119 to open, thereby connecting the bypass flow channel 105; the pilot actuator 118 can control the pilot valve port 119 to close, thereby cutting off the bypass flow channel 105.

[0054] Reference Figure 3 , Figure 4 As shown, in this embodiment, the pilot valve 118 has the structure of a solenoid valve. The pilot valve 118 also includes a housing 200, a pilot valve plate 204, a return spring 205, a solenoid mechanism 212, a valve stem 202, and a power terminal 207. The housing 200 serves as a support and is generally cylindrical, comprising a first half-shell 209 and a second half-shell 210. The first half-shell 209 and the second half-shell 210 are fitted together to form a hollow housing 200, facilitating the installation of the components within the housing 200. Furthermore, a sealed connection is achieved at the junction of the first half-shell 209 and the second half-shell 210. Specifically, a sealing element 211 can be installed at the junction for sealing; alternatively, an interference fit can be used to achieve a seal, allowing for mutual locking and sealing at the connection after assembly.

[0055] The electromagnetic mechanism 212 is sealed and installed inside the housing 200, which can seal and separate the electromagnetic mechanism 212 from the chamber inside the valve body 100, preventing the gas from directly contacting the electromagnetic mechanism 212 and preventing the electromagnetic mechanism 212 from being corroded by the gas.

[0056] A through hole 213 is provided on the side of the housing 200 facing the bypass channel 105. One end of the valve stem 202 is located inside the housing 200, and the other end extends through the through hole 213 into the bypass channel 105 and is fitted with a pilot valve plate 204. The valve stem 202 and the through hole 213 are sealed together. By sealing the connection between the valve stem 202 and the through hole 213, gas crossflow between the bypass channel 105 and the inner cavity of the housing 200 can be prevented.

[0057] The valve stem 202 and the through hole 213 are sealed to each other, ensuring that the valve stem 202 can extend and retract normally, and effectively sealing the bypass channel 105 with the inner cavity of the housing 200, thus preventing gas crossflow between the bypass channel 105 and the inner cavity of the housing 200.

[0058] Specifically, the sealing structure between the valve stem 202 and the through hole 213 can adopt a gap seal. By utilizing the fitting precision between the valve stem 202 and the through hole 213, the gap between them can be reduced, which can, to a certain extent, shield against the accumulation of corrosive substances caused by the gas environment. Alternatively, the sealing structure between the valve stem 202 and the through hole 213 can also be sealed using a sealing element, such as an O-ring seal, labyrinth seal, radial lip seal, V-type combination seal, or annular diaphragm seal. In addition, sealing grease can be used as an auxiliary seal on the basis of the above sealing structure.

[0059] The electromagnetic mechanism 212 includes a stator 201 and a mover 206, which are magnetically attracted to each other. Specifically, the stator 201 is an electromagnetic coil, and the mover 206 is an actuator that can be magnetically attracted by the electromagnetic coil after it is energized. The stator 201 is fixed inside the housing 200, and the mover 206 is movably installed inside the housing 200. The mover 206 is connected to the end of the valve stem 202, and the mover 206 and the valve stem 202 can maintain synchronous sliding adjustment.

[0060] The return spring 205 is located outside the housing 200, specifically it can be fitted around the outer periphery of the valve stem 202. The two ends of the return spring 205 elastically press against the housing 200 and the pilot valve plate 204. Through the elastic action of the return spring 205, the valve stem 202 can be driven to extend outward from the housing 200, and the mover 206 is in a state of being far away from the stator 201.

[0061] In addition, one end of the power terminal 207 extends into the housing 200 and is electrically connected to the electromagnetic mechanism 212, while the other end extends out of the housing 200. The power terminal 207 and the housing 200 are mutually sealed. Specifically, a sealing element 208 can be installed at the connection to achieve the seal and maintain the closed state of the inner cavity of the housing 200.

[0062] When the pilot valve 118 is installed, part of the valve stem 202 extends into the bypass channel 105, and the pilot valve plate 204 is located in the bypass channel 105 and can move with the extension and retraction of the valve stem 202. During the movement, the pilot valve plate 204 has a first state and a second state. In the first state, the pilot valve plate 204 can press against and close the pilot valve port 119, cutting off the bypass channel 105 and disconnecting the first chamber 101 and the second chamber 102. In the second state, the pilot valve plate 204 separates from the pilot valve port 119, the pilot valve port 119 opens, and the bypass channel 105 connects the first chamber 101 and the second chamber 102.

[0063] In this embodiment, when the power is off, the pilot valve 118 is operated by a return spring 205, which uses elastic force to maintain the pilot valve plate 204 in a first state, i.e., the bypass channel 105 is in a cut-off state. When the electromagnetic mechanism 212 is energized, it generates a magnetic attraction force, which can overcome the return spring 205 maintaining the pilot valve plate 204 in a second state and the bypass channel 105 in a connected state.

[0064] In the pilot-operated valve 118, in the first state, the stator 201 and the mover 206 are far apart; in the second state, the stator 201 and the mover 206 are close together, and the close-to-each state is conducive to magnetic adsorption.

[0065] Reference Figure 2 , Figure 5 As shown, in this embodiment, the gas valve also includes an operating switch 115 and a linkage 120. The linkage 120 is installed inside the valve body 100 and can generate a deflection action. The linkage 120 enables the linkage between the operating switch 115 and the pilot valve 118.

[0066] The operating switch 115 is divided into two parts. The first part is a knob shaft 1151, which is installed outside the valve body 100. A knob is installed on the knob shaft 1151. The knob shaft 1151 can realize axial rotation adjustment and axial sliding adjustment, so as to be suitable for pressing and rotating adjustment. In addition, a rotary potentiometer 1152 is also installed at the knob shaft 1151 of the operating switch 115. By rotating it, different working states of the burner can be adjusted and the gas supply can be adjusted.

[0067] The second part is the movable block 116. Part of the movable block 116 extends into the valve body 100 and can abut against the linkage 120. Part of the movable block 116 extends out of the valve body 100 and can be opposite to the knob shaft 1151. The movable block 116 can be adjusted to realize the linkage between the knob shaft 1151 and the linkage 120.

[0068] Specifically, a sealing diaphragm 117 is installed at the connection between the movable block 116 and the valve body 100 to achieve a seal at the connection. The elastic deformation of the sealing diaphragm 117 provides space for the movable block 116 to move. A return spring 1161 is elastically mounted on the movable block 116 and applies an elastic force toward the knob shaft 1151 to the movable block 116, thereby causing the movable block 116 to elastically return to its original position.

[0069] In use, the movable block 116 has a pressed state and a reset state. By pressing the knob shaft 1151 of the operation switch 115, the movable block 116 can be pressed into the valve body 100, and the movable block 116 is in the pressed state after being pressed. In the pressed state, the movable block 116 drives the pilot valve plate 204 to move to the second state through the linkage 120, that is, the bypass flow channel 105 can be opened manually. After the knob shaft 1151 of the operation switch 115 is released, the reset spring 1161 elastically drives the movable block 116 to reset.

[0070] Specifically, the linkage 120 is installed in the second chamber 102, and correspondingly, part of the movable block 116 extends into the second chamber 102.

[0071] Reference Figures 5-9 As shown, the main body of the linkage 120 is a shaft, and the outer side of the linkage 120 is integrally connected with a first linkage part 121 and a second linkage part 122. The linkage 120 is rotatably mounted in the second chamber 102. The part of the movable block 116 that extends into the second chamber 102 is opposite to the first linkage part 121. The second linkage part 122 has a hook-shaped structure and extends into the pilot valve port 119, opposite to the pilot valve plate 204. In the pressed state, the movable block 116 can abut against the first linkage part 121, which can drive the linkage 120 and the second linkage part 122 to produce axial deflection. The second linkage part 122 can push the pilot valve plate 204 to move to the second state, which can open the pilot valve port 119.

[0072] Reference Figure 1 As shown, a first valve port 112 is opened between the first chamber 101 and the second chamber 102. A first gas valve 108 is located on one side of the first chamber 101 of the first valve port 112, and a first spring 111 is installed on the side of the first gas valve 108 facing away from the first valve port 112. A first diaphragm 107 is installed on the outer periphery of the first gas valve 108, with one side of the first diaphragm 107 facing the first chamber 101 and the other side forming a first balance chamber 109. A bypass channel 105 is connected to the first balance chamber 109 through a first connecting hole 110, allowing a portion of the gas pressure to be input into the first balance chamber 109 on the back side of the first diaphragm 107.

[0073] A second valve port 123 is formed between the second chamber 102 and the third chamber 103. A second air valve 124 is located on one side of the second chamber 102 of the second valve port 123, and a second spring 125 is installed on the side of the second air valve 124 facing away from the second valve port 123. A second diaphragm 127 is installed on the outer periphery of the second air valve 124, with one side of the second diaphragm 127 facing the second chamber 102 and the other side forming a second balancing chamber 126. A second throttling orifice 113 is formed between the second chamber 102 and the second balancing chamber 126.

[0074] In addition, the valve body 100 also has a bypass cavity 132, which is connected to the second balance cavity 126 through a second connecting hole 129; the bypass cavity 132 is also connected to the third chamber 103 through a third connecting hole 130. An electric valve port 131 is formed between the third connecting hole 130 and the bypass cavity 132. An electric servo valve 128 is installed in the bypass cavity 132, and the electric servo valve 128 can control the opening and closing of the electric valve port 131.

[0075] Reference Figures 12-15 As shown, the gas valve in this embodiment has four states during use. The first state is as follows: Figure 12 As shown, when the gas valve is not working, the pilot valve 118 is in a de-energized state, the return spring 205 elastically maintains the pilot valve plate 204 in the first state, and the pilot valve port 119 is in a closed state; the first gas valve 108 and the second gas valve 124 are closed, the gas input from the gas inlet 104 stays in the first chamber 101, and the ignition outlet 114 and the gas outlet 133 do not output gas.

[0076] The second state, refer to Figure 13 As shown, when the gas valve is ignited, by manually pressing the operation switch 115, the knob shaft 1151 of the operation switch 115 pushes the movable block 116, which in turn drives the pilot valve plate 204 of the pilot actuator valve 118 through the linkage 120, manually pushing the pilot valve plate 204 to the second state. The pilot valve port 119 is in the open state, and the first chamber 101, the bypass flow channel 105, and the second chamber 102 are connected. The gas input from the air inlet 104 can pass through the bypass flow channel. 105 enters the second chamber 102, and then outputs part of the gas to the ignition device from the ignition outlet 114; the ignition device can be ignited by manually operating the piezoelectric igniter 300; after the ignition device is ignited, the potential difference generated by the thermopile can energize the electromagnetic mechanism 212 of the pilot valve 118, generating a magnetic adsorption effect, which can maintain the pilot valve plate 204 in the second state, keeping the first chamber 101, the bypass channel 105, and the second chamber 102 connected;

[0077] Meanwhile, since the first chamber 101, the bypass channel 105, and the second chamber 102 are connected, the gas enters the second chamber 102, the pressure in the second chamber 102 increases, the first gas valve 108 will be opened, and the first chamber 101 and the second chamber 102 are directly connected through the first valve port 112; the gas in the second chamber 102 will also enter the second balance chamber 126 and the bypass chamber 132; the second gas valve 124 is closed, and the gas input from the inlet 104 is output from the ignition outlet 114 to keep the ignition device burning continuously, and the outlet 133 does not output gas.

[0078] The third state, refer to Figure 14 As shown, when the ignition device is in the ignition state, the electric servo valve 128 is controlled to work according to the gear adjusted by the rotary potentiometer 1152 of the operation switch 115. When the monitored temperature does not reach the preset temperature and combustion heating is required, the electric servo valve 128 opens the electric valve port 131, so that the third chamber 103 is connected to the bypass chamber 132, and the gas is input into the third chamber 103 from the third connection hole 130. At the same time, the pressure in the third chamber 103 increases, and the second gas valve 124 will open. The second chamber 102 and the third chamber 103 are directly connected through the second valve port 123. Part of the gas input from the gas inlet 104 is output from the ignition outlet 114 to keep the ignition device burning continuously, and most of it is output from the gas outlet 133 to supply the main burner for combustion.

[0079] The fourth state, see reference. Figure 15 As shown, in the ignition state of the ignition device, the electric servo valve 128 is controlled by the setting adjusted by the rotary potentiometer 1152 of the operating switch 115. When the monitored temperature reaches the preset temperature, combustion heating is no longer needed, and the electric servo valve 128 closes the electric valve port 131, cutting off the third chamber 103 from the bypass chamber 132. Gas stops being input into the third chamber 103 from the third connection port 130. The second gas valve 124 closes again, cutting off the second chamber 102 and the third chamber 103 from each other. Gas input from the inlet 104 no longer exits from the outlet 133, and only a portion of gas is output from the ignition outlet 114, maintaining continuous combustion of the ignition device. When the monitored temperature drops again and fails to reach the preset temperature, requiring re-combustion heating, the third state is executed again. During the combustion operation of the main burner, the state of the electric servo valve 128 is adjusted according to the monitored temperature and the preset temperature setting to achieve different combustion modes, so that the heated area can be maintained within the preset temperature range.

[0080] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A gas valve, characterized in that The valve body (100) is provided with a first chamber (101), a second chamber (102) and a third chamber (103), the first chamber (101) is provided with an air inlet (104), the second chamber (102) is provided with an ignition outlet (114), and the third chamber (103) is provided with an air outlet (133); the first air valve (108) is used for switching the first chamber (101) and the second chamber (102), and the second air valve (124) is used for switching the second chamber (102) and the third chamber (103); The valve body (100) is further provided with a bypass flow channel (105) capable of communicating the first chamber (101) and the second chamber (102); The pilot execution valve (118) further comprises a shell (200), a pilot valve plate (204), a reset spring (205) and an electromagnetic mechanism (212), the pilot valve plate (204) is movably installed in the bypass flow channel (105) and has a first state and a second state; in the first state, the pilot valve plate (204) cuts off the bypass flow channel (105), and the first chamber (101) and the second chamber (102) are disconnected; in the second state, the pilot valve plate (204) opens the bypass flow channel (105), and the first chamber (101) and the second chamber (102) are communicated; The reset spring (205) elastically maintains the pilot valve plate (204) in the first state, and the electromagnetic mechanism (212) can overcome the reset spring (205) to maintain the pilot valve plate (204) in the second state when energized; The operating switch (115) further comprises a movable block (116) capable of being elastically pressed, and the movable block (116) is linked with the pilot valve plate (204) through the linkage (120); the movable block (116) has a pressed state and a reset state, and in the pressed state, the movable block (116) drives the pilot valve plate (204) to move to the second state through the linkage (120).

2. A gas valve according to claim 1, characterised in that The electromagnetic mechanism (212) is installed in the inner cavity of the shell (200), and the inner cavity of the shell (200) and the bypass flow channel (105) are sealed from each other.

3. A gas valve according to claim 2, characterised in that The pilot execution valve (118) further comprises a valve rod (202), one side of the shell (200) facing the bypass flow channel (105) is provided with a through hole (213), one end of the valve rod (202) is located in the shell (200), the other end of the valve rod (202) extends into the bypass flow channel (105) and installs the pilot valve plate (204), and the valve rod (202) is sealingly matched with the through hole (213).

4. A gas valve according to claim 2, wherein The electromagnetic mechanism (212) comprises a stator (201) and a rotor (206) capable of being magnetically attracted to each other, the stator (201) is fixed in the shell (200), and the rotor (206) is installed on the valve rod (202); In the first state, the stator (201) and the rotor (206) are away from each other; in the second state, the stator (201) and the rotor (206) are close to each other.

5. A gas valve according to claim 1, wherein The pilot valve (118) further comprises an electric terminal (207) which is connected with the electromagnetic mechanism (212) at one end and extends out of the shell (200) at the other end, and the electric terminal (207) is sealed with the shell (200); The first reset spring (205) is located outside the shell (200) and elastically abuts against the shell (200) and the pilot valve plate (204).

6. A gas valve according to claim 1, wherein The bypass flow channel (105) and the second chamber (102) are provided with a pilot valve port (119), and the pilot valve plate (204) closes the pilot valve port (119) in the first state and opens the pilot valve port (119) in the second state.

7. A gas valve according to claim 6, characterised in that The linkage (120) is rotatably installed in the second chamber (102) and has a first linkage part (121) and a second linkage part (122), and the movable block (116) can abut against the first linkage part (121) in the pressing state, and the second linkage part (122) partially extends into the pilot valve port (119) and abuts against the pilot valve plate (204).

8. A gas valve according to claim 6, wherein The operation switch (115) further comprises a sealing diaphragm (117), a second reset spring (1161) and a knob shaft (1151), the knob shaft (1151) is installed outside the valve body (100) and can axially slide and rotate to adjust; One end of the movable block (116) is located in the second chamber (102), and the other end extends out of the valve body (100) and axially abuts against the knob shaft (1151); the movable block (116) is sealed with the second chamber (102) through the sealing diaphragm (117); and the second reset spring (1161) elastically acts on the movable block (116) towards the knob shaft (1151).

9. A gas valve according to claim 1, wherein The first chamber (101) and the second chamber (102) are provided with a first valve port (112), the first gas valve (108) is located on the first chamber (101) side of the first valve port (112), the outer periphery of the first gas valve (108) is provided with a first diaphragm (107), one side of the first diaphragm (107) faces the first chamber (101), and the other side forms a first balance chamber (109); the bypass flow channel (105) and the first balance chamber (109) are communicated through a first connecting hole (110); and the first chamber (101) and the bypass flow channel (105) are communicated through a first throttling hole (106).

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