A gas appliance and a method of controlling the same

Abstract

The application discloses a gas appliance and a control method thereof. The gas appliance comprises an ignition coil and a thermocouple; a combination valve is arranged on a gas pipeline of the gas appliance and used for opening or cutting off the gas pipeline between a gas source and the gas appliance, and comprises a user end and a gas source end; the combination valve comprises a solenoid valve and a gas safety valve, the solenoid valve is arranged between the gas safety valve and the gas source end, and the solenoid valve is electrically connected with the ignition coil and the thermocouple. The problem that the sensitivity of the self-closing valve of the existing gas appliance is low and micro leakage cannot be detected is solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas appliances, more particularly, to a gas appliance and a control method thereof. BACKGROUND

[0002] Gas as a clean and efficient energy has brought a lot of convenience to our life. However, safety problems such as gas leakage and explosion are common. According to statistics, the property loss and personnel casualties caused by gas leakage and explosion accidents are very serious every year. Therefore, it has become a top priority to strengthen gas safety management and protect the safety of citizens' life and property.

[0003] The pipeline gas self-closing valve is installed on the pipeline of the low-pressure gas system. When the pipeline appears under-pressure, over-pressure or gas leakage, it can automatically close without electricity or other external power and must be manually opened. It works automatically and is reliable for a long time.

[0004] However, when a small amount of leakage occurs at the rear end of the self-closing valve, that is, a small amount of leakage occurs in the gas pipeline between the self-closing valve and the gas appliance, since the gas source at the front end of the self-closing valve is always replenishing the gas pipeline, the pressure difference between the two ends of the self-closing valve does not change significantly, and the self-closing valve cannot detect the small amount of leakage, so it cannot cut off the gas pipeline from the gas source to the gas appliance in time, causing safety hazards. SUMMARY

[0005] In view of the low sensitivity of the self-closing valve of the existing gas appliance and the problem that small amount of leakage cannot be detected, the present application provides a gas appliance and a control method thereof. The gas appliance comprises: an ignition coil and a thermocouple; a combination valve arranged on a gas pipeline of the gas appliance and used for opening or cutting off the gas pipeline between a gas source and the gas appliance, comprising a user end and a gas source end; the combination valve comprises an electromagnetic valve and a gas safety valve, the electromagnetic valve is arranged between the gas safety valve and the gas source end, and the electromagnetic valve is electrically connected with the ignition coil and the thermocouple.

[0006] Further, the electromagnetic valve comprises: a valve body provided with a first valve port; an electromagnetic assembly located in the valve body and electrically connected with a controller; a valve cover movably arranged above the first valve port and used for opening or closing the first valve port, and a spring is arranged between the valve cover and the valve body, the spring is used for keeping the first valve port in a closed state when the gas safety valve is closed; a valve core, one end of the valve core is connected with the valve cover, and the other end of the valve core is connected with the electromagnetic assembly, and the valve core can drive the valve cover to move up and down; and a magnetic member located at one end of the valve body away from the valve cover and used for keeping the first valve port in an open state when the gas safety valve is opened.

[0007] Further, the first valve port is an arc-shaped sealing surface, which comprises a sealing plane, a first sealing inclined surface arranged on the outside of the sealing plane and connected to the sealing plane by a circular arc, and a second sealing arc surface arranged on the inside of the sealing plane and connected to the sealing plane.

[0008] Further, the valve cover is provided with an annular sealing surface on the side close to the first valve port, the inner diameter of the annular sealing surface is smaller than the inner diameter of the first valve port, and the outer diameter of the annular sealing surface is larger than the outer diameter of the first valve port, so that the annular sealing surface can cover the sealing surface of the first valve port.

[0009] Further, the valve cover comprises a sealing body for sealing the first valve port and a gland arranged above the sealing body, wherein when the valve cover closes the first valve port, the sealing body is arranged between the gland and the first valve port and is in close contact with the sealing surface of the first valve port.

[0010] Further, the combined valve further comprises a user joint connected to the user end of the electromagnetic valve, wherein the user joint is provided with an inner thread matched with a user pipeline, and the electromagnetic valve is connected to the user pipeline through the user joint.

[0011] Further, the user joint is connected to the electromagnetic valve by a snap spring, and at least one sealing ring is arranged at the connection between the user joint and the user end.

[0012] Further, the electromagnetic valve is a pulse valve, and the combined valve further comprises a controller, and the electromagnetic valve is connected to the gas appliance or a signal acquisition device through the controller.

[0013] Further, the signal input end of the controller is signal-connected to the signal output end of the ignition coil, and the thermocouple supplies power to the controller.

[0014] Further, the present application provides a gas water heater. The gas water heater comprises a combined valve arranged on the gas pipeline of the gas water heater, a water flow monitoring part arranged on the water pipeline of the water inlet end or water outlet end of the gas water heater for monitoring the water flow in real time, and a power adapter electrically connected to the controller and the electromagnetic valve for supplying power to the controller and the electromagnetic valve, wherein the signal input end of the controller is signal-connected to the water flow monitoring part, and the controller can control the electromagnetic valve to be closed according to the water flow value obtained by the water flow monitoring part.

[0015] Further, the gas safety valve is communicated with the gas water heater through a first gas pipeline, and the electromagnetic valve is communicated with a gas source through a second gas pipeline; when a pressure difference between the first gas pipeline side and the electromagnetic valve side is greater than or equal to a first pressure threshold, the gas safety valve is switched from an open state to a closed state.

[0016] Further, the present application provides a control method of a gas appliance. The control method of the gas appliance is applied to the gas appliance as described above, and the control method of the gas appliance comprises: if a water flow value of a water pipeline of the gas water heater is less than or equal to a flow threshold, determining that the water heater is closed, and the controller controls the electromagnetic valve to be closed for a first time length.

[0017] Further, the control method of the gas appliance further comprises: obtaining a pressure difference between the first gas pipeline side and the electromagnetic valve side; determining whether the pressure difference is greater than or equal to a second pressure threshold; if yes, obtaining a water flow value of a water pipeline of the gas water heater, and determining a reason why the pressure difference is greater than or equal to the second pressure threshold according to a size relationship between the water flow value and the flow threshold; wherein the second pressure threshold is less than the first pressure threshold.

[0018] Further, the determining of the reason why the pressure difference is greater than or equal to the second pressure threshold according to the size relationship between the water flow value and the flow threshold comprises: if the water flow value of the water pipeline of the gas water heater is less than or equal to the flow threshold, determining that a water switch of the water pipeline is in a closed state, and determining that the reason why the pressure difference is greater than or equal to the second pressure threshold is that there is unextinguished residual fire in the gas water heater.

[0019] Further, if there is unextinguished residual fire in the gas water heater, the electromagnetic valve is controlled to be closed for the first time length.

[0020] Further, if the water flow value of the water pipeline of the gas water heater is greater than the flow threshold, the reason why the pressure difference is greater than or equal to the second pressure threshold is that there is leakage at the first gas pipeline, and an alarm signal is sent to prompt a user to perform maintenance.

[0021] Further, the power adapter comprises a 220V AC to 12V DC module, and is equipped with a backup battery; when the combined valve is powered off, the backup battery can provide backup working power for the controller and the electromagnetic valve.

[0022] Technical effects and advantages of the present application:

[0023] An electromagnetic valve is additionally arranged at a position close to the gas source of the existing self-closing valve, and the electromagnetic valve is electrically connected with the ignition coil and the thermocouple, so that the electromagnetic valve of the combined valve can be powered by the thermocouple of the gas appliance, and the synchronization closing of the electromagnetic valve of the combined valve and the gas appliance can be realized through the signal transmission between the ignition coil and the electromagnetic valve. When the gas appliance is closed, the electromagnetic valve of the combined valve is also closed, so as to cut off the gas pipeline in front of the gas safety valve. That is to say, when the gas appliance is closed, the gas source cannot supply gas to the front end of the gas safety valve. Therefore, when a small amount of leakage occurs at the rear end of the gas safety valve, that is, a small amount of leakage occurs in the gas pipeline between the gas safety valve and the gas appliance, the pressure difference change between the two ends of the gas safety valve can be amplified, and the gas leakage sensitivity of the combined valve is improved. Thus, the problems that the existing self-closing valve has low gas leakage sensitivity due to the gas supply at the front end, and the small amount of leakage at the rear end of the gas safety valve cannot be detected in time are solved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic diagram of a gas appliance provided by the present application, the left side is a gas pipeline, and the right side is a water pipeline;

[0025] Figure 2 is a structural schematic diagram of a combined valve in the present application; Figure 1

[0026] Figure 3 is a structural schematic diagram of another combined valve provided by the present application;

[0027] Figure 4 is a sectional view of the combined valve in the present application; Figure 3

[0028] is a sectional view of the connection between the user joint and the electromagnetic valve in the present application; Figure 5 Figure 3 is an exploded view of the connection between the user joint and the electromagnetic valve in the present application;

[0029] Figure 6 Figure 3 is a local enlarged view of the valve cover and the first valve port in the present application;

[0030] Figure 7 is a local enlarged view of the first valve port in the present application; Figure 4

[0031] Figure 8 Figure 7

[0032] Figure 9 is an exploded schematic diagram of the electromagnetic valve;

[0033] Figure 10 is a sectional view of the connection between the cover plate and the magnetic body;

[0034] Figure 11 ​​​​​​Fig. 1 is a schematic diagram of the connection between the controller and the electromagnetic valve and the water flow monitoring unit;

[0035] Figure 12 Fig. 4 is a flow chart of a control method of a gas water heater provided in the present application.

[0036] Fig. 1 is a schematic diagram of the connection between the controller and the electromagnetic valve and the water flow monitoring unit;

[0037] 100, combination valve; 101, gas source end; 102, user end; 10, electromagnetic valve; 20, gas safety valve; 30, first valve port; 40, user joint; 51, snap spring; 52, sealing ring; 60, controller; 70, magnetic member; 71, cover plate; 72, magnetic body; 721, recess;

[0038] 11, power line; 12, coil; 13, iron core; 131, protruding member; 14, valve core; 141, baffle; 15, valve cover; 151, gland; 152, sealing body; 16, spring; 31, sealing plane; 32, first sealing inclined surface; 33, second sealing arc surface;

[0039] 300, gas water heater; 210, water flow monitoring unit; 220, power adapter; 221, first signal line; 222, second signal line; 223, second power line; 400, gas source; 410, first gas pipeline; 420, second gas pipeline; 500, water source. DETAILED DESCRIPTION

[0040] The present application will be further described below in conjunction with the drawings and specific embodiments. The embodiments of the present application are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present application to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments are chosen and described in order to best explain the principles of the present application and its practical application, and to enable others skilled in the art to understand the present application for various embodiments with various modifications as are suited to the particular use contemplated.

[0041] The present application provides a gas appliance. The gas appliance comprises an ignition coil, a thermocouple, and a combination valve 100. The combination valve 100 is connected to the gas input pipeline of the gas appliance through the user end 102. The signal output end of the ignition coil is connected to the signal input end of the controller 60, and the thermocouple supplies power to the controller 60. For example, the gas appliance can be a gas stove, a gas water heater, or any other appliance using gas as fuel.

[0042] Referring to Figure 2The combined valve 100 is arranged on a gas pipeline of the gas appliance and is used to open or cut off the gas pipeline between the gas source 400 and the gas appliance, and comprises a gas source end 101 and a user end 102. Specifically, the combined valve 100 comprises an electromagnetic valve 10 and a gas safety valve 20, and the electromagnetic valve 10 is electrically connected with an ignition coil and a thermocouple of the gas appliance. The gas safety valve 20 is arranged on one side of the combined valve 100 close to the user end 102, and the electromagnetic valve 10 is arranged on one side of the combined valve 100 close to the gas source end 101. That is, the electromagnetic valve 10 is located at the front end of the gas safety valve 20, that is, the electromagnetic valve 10 is located on one side of the gas safety valve 20 close to the gas source 400. When the gas appliance is turned on, the electromagnetic valve 10 is opened; when the gas appliance is turned off, the electromagnetic valve 10 is closed. For example, the signal source of the controller 60 can be the ignition coil of the gas appliance, or a signal acquisition device such as a water flow sensor.

[0043] In one specific embodiment, the thermocouple of the gas appliance supplies power to the electromagnetic valve 10. When the flame of the gas appliance is extinguished, the electromagnetic valve 10 is powered off and closed, cutting off the gas pipeline of the gas source leading to the gas safety valve 20, so as to improve the gas leakage detection sensitivity of the gas safety valve 20 when a trace leakage occurs in the gas pipeline between the gas safety valve 20 and the gas appliance.

[0044] Preferably, in combination Figure 3 The combined valve 100 further comprises a controller 60. For example, the electromagnetic valve 10 is a pulse valve, and the electromagnetic valve 10 is connected to the gas appliance or the signal acquisition device through the controller 60.

[0045] In one specific embodiment, the gas appliance is a gas stove, a gas water heater or other appliance using gas as fuel. The signal source of the controller 60 is the ignition coil of the gas appliance. When the ignition coil senses that the flame is extinguished, the controller 60 can receive the flame extinguishing signal sent by the ignition coil, and according to the signal, the controller 60 can control the electromagnetic valve 10 to switch from the open state to the closed state, cutting off the gas pipeline of the gas source leading to the gas safety valve 20, so as to improve the gas leakage detection sensitivity of the gas safety valve 20 when a trace leakage occurs in the gas pipeline between the gas safety valve 20 and the gas appliance.

[0046] For example, the gas appliance is a gas water heater, and the signal source of the controller 60 is a water flow sensor or other signal acquisition device for detecting whether the gas water heater is closed. In one specific embodiment, when the water flow sensor detects that the waterway is closed, the controller 60 can receive the waterway closing signal sent by the water flow sensor, and according to the signal, the controller 60 can control the electromagnetic valve 10 to switch from the open state to the closed state, cutting off the gas pipeline of the gas source leading to the gas safety valve 20, so as to improve the gas leakage detection sensitivity of the gas safety valve 20 when a trace leakage occurs in the gas pipeline between the gas safety valve 20 and the gas appliance.

[0047] It can be understood that the combination valve 100 provided by the present application adds an electromagnetic valve 10 at the position of the existing self-closing valve close to the gas source 400, and the electromagnetic valve 10 is signal connected with the signal acquisition device through the controller 60, so that the electromagnetic valve 10 of the combination valve 100 can be closed synchronously with the gas appliance through the controller 60. That is, when the gas appliance is closed, the electromagnetic valve 10 of the combination valve 100 is also closed, cutting off the gas pipeline in front of the gas safety valve 20. That is, when the gas appliance is closed, the gas source cannot supplement the gas in front of the gas safety valve 20. Therefore, when a small amount of leakage occurs at the rear end of the gas safety valve 20, that is, a small amount of leakage occurs in the gas pipeline between the gas safety valve 20 and the gas appliance, the pressure difference change between the two ends of the gas safety valve 20 can be amplified, and the gas leakage sensitivity of the combination valve 100 is improved. Thus, the problem that the existing self-closing valve has low gas leakage sensitivity due to the front-end gas supplement and cannot detect the small amount of leakage at the rear end of the self-closing valve in time is solved.

[0048] Further, in combination with Figures 2 to 10 The electromagnetic valve 10 is a pulse valve, for example, and includes a power line 11, a magnetic member 70, a valve body, an electromagnetic assembly, a valve core 14, a valve cover 15, and a spring 16. The valve body is provided with a first valve port 30; the valve cover 15 is movably arranged above the first valve port 30 and is used to open or close the first valve port 30; the valve core 14 passes through the valve cover 15 from the middle of the valve cover 15, and the valve core 14 can drive the valve cover 15 to move up and down.

[0049] Specifically, the electromagnetic assembly is located in the valve body and is electrically connected with the controller 60, and the electromagnetic assembly can drive the valve core 14 and the valve cover 15 to move downward to close the first valve port 30. For example, the electromagnetic assembly includes a coil 12 and an iron core 13. The spring 16 is arranged above the valve cover 15 and is used to press the valve cover 15 when the electromagnetic valve 10 is closed, so as to keep the first valve port 30 in a closed state. The magnetic member 70 is located at one end of the valve body away from the valve cover 15, and is used to keep the first valve port 30 in an open state when the electromagnetic valve 10 is opened.

[0050] For example, the magnetic member 70 is a permanent magnet arranged at the top end of the valve body, and the magnetic attraction of the magnetic member 70 can keep the iron core 13 at an upper limit position. At this time, the valve cover 15 opens the first valve port 30, and the first valve port 30 remains in an open state. The electromagnetic valve 10 is opened, and the gas pipeline from the gas source end 101 to the gas safety valve 20 is opened.

[0051] When the gas water heater is turned off, the ignition coil of the gas water heater senses the flameout and sends a flameout signal, the controller 60 can receive the flameout signal and send a pulse power according to the flameout signal, control the electromagnetic assembly to be energized and operated, the electromagnetic assembly generates a downward magnetic attraction, and the magnetic attraction generated by the electromagnetic assembly is greater than the magnetic attraction of the magnetic part 70, so that the valve core 14 and the valve cover 15 move downward, the valve cover 15 closes the first valve port 30, and the spring 16 can keep the valve cover 15 in the closed state, thereby cutting off the gas pipeline from the gas source end 101 to the gas safety valve 20.

[0052] It can be understood that, compared with controlling the opening and closing of the electromagnetic valve 10 only by the electromagnetic assembly, by additionally providing the magnetic part 70 and the spring 16 at the electromagnetic valve 10, the magnetic attraction of the magnetic part 70 can be used to keep the electromagnetic valve 10 in the open state when the gas appliance is used, and the elastic force of the spring 16 can be used to keep the electromagnetic valve 10 in the closed state, so that the electromagnetic assembly does not need to be energized and operated at all in the two states of opening and closing; only when the gas water heater is turned off, the electromagnetic assembly will be energized and operated to close the electromagnetic valve 10, so as to reduce the energization time of the electromagnetic assembly, reduce the energy consumption of the electromagnetic valve 10, and further reduce the operating energy consumption of the combined valve 100, thereby saving more electricity and being more energy-saving.

[0053] Further, in combination with Figure 10 The magnetic part 70 comprises a cover plate 71 and a magnetic body 72. The bottom end of the magnetic body 72 is provided with a groove 721, and the top end of the iron core 13 is provided with a protruding part 131. When the valve cover 15 opens and keeps the first valve port 30 open, the protruding part 131 is located in the groove 721. By providing the groove 721 at the bottom end of the magnetic body 72 and the protruding part 131 at the top end of the iron core 13, the contact area between the magnetic body 72 and the iron core 13 can be increased, thereby increasing the magnetic attraction between the magnetic body 72 and the iron core 13. For example, the shapes of the protruding part 131 and the groove 721 are truncated cone shapes.

[0054] Further, the upper half of the electromagnetic valve 10 is connected to the valve body of the lower half by clamping. It can be understood that the clamping mode is convenient to disassemble and assemble, and the upper half of the electromagnetic valve 10 can be disassembled during transportation, thereby reducing the occupied space of the combined valve 100 and reducing the transportation cost. On the other hand, the upper half of the electromagnetic valve 10 is provided with the electromagnetic assembly and needs to be connected to the circuit for energization, and the valve body of the lower half is all sealed related parts and does not need to be connected to the circuit for energization. When there is a circuit failure in the electromagnetic valve 10, the clamping mode facilitates the disassembly of the upper half of the electromagnetic valve 10 for maintenance, and the maintenance and troubleshooting are relatively convenient.

[0055] Further, in combination with Figure 7 and Figure 8The first valve port 30 is provided with an arc-shaped sealing surface on the side close to the valve cover 15.

[0056] It should be noted that the sealing surface at the valve port of the conventional electromagnetic valve is a flat surface, and the sealing contact area is relatively small. By providing the arc-shaped sealing surface at the first valve port 30, the contact area between the first valve port 30 and the valve cover 15 can be increased, and the sealing performance is better.

[0057] Further, in combination with Figure 8 The sealing surface of the first valve port 30 includes a sealing flat surface 31, a first sealing inclined surface 32, and a second sealing arc surface 33. The first sealing inclined surface 32 is arranged on the outer side of the sealing flat surface 31 and connected to the sealing flat surface 31 in a circular arc manner; and the second sealing arc surface 33 is arranged on the inner side of the sealing flat surface 31 and connected to the sealing flat surface 31 in an inclined manner. For example, the first sealing inclined surface 32 can be an inclined surface or an arc surface, which is not limited herein.

[0058] It should be noted that the processing difficulty of the full-arc sealing surface is relatively large, and the processing cost is relatively high. By combining the sealing flat surface 31 and the sealing arc surface, the sealing performance of the electromagnetic valve 10 can be improved while avoiding a substantial increase in processing difficulty and processing cost.

[0059] Further, in combination with Figure 8 The first sealing inclined surface 32 and the second sealing arc surface 33 are both arranged in an inclined downward manner.

[0060] It should be noted that when the gas is not pure, impurities and foreign matters can exist in the gas pipeline. When the impurities and foreign matters are located at the valve port of the conventional electromagnetic valve with a flat sealing surface, the impurities and foreign matters will stay on the flat surface. When the electromagnetic valve is closed, the impurities and foreign matters are just located between the flat surface and the valve cover 15, so the flat surface and the valve cover 15 cannot be completely in contact, thereby affecting the sealing performance.

[0061] By arranging the first sealing inclined surface 32 and the second sealing arc surface 33 in an inclined downward manner, the impurities and foreign matters in the gas pipeline cannot stay on the sealing surface of the first valve port 30. When the impurities and foreign matters are located at the sealing surface of the first valve port 30, the outer side of the sealing flat surface 31 is provided with the first sealing inclined surface 32 arranged in an inclined downward manner, and the inner side of the sealing flat surface 31 is provided with the second sealing arc surface 33 arranged in an inclined downward manner, so the impurities and foreign matters can slide along the first sealing inclined surface 32 or the second sealing arc surface 33 and cannot stay on the sealing surface of the first valve port 30. When the electromagnetic valve 10 is closed, the valve cover 15 can be completely in contact with the sealing surface of the first valve port 30, thereby ensuring the sealing performance at the first valve port 30.

[0062] In one specific embodiment, in combination with Figure 7The valve cover 15 is provided with an annular sealing surface on the side close to the first valve port 30, the inner diameter of the annular sealing surface is smaller than the inner diameter of the first valve port 30, and the outer diameter of the annular sealing surface is larger than the outer diameter of the first valve port 30, so that the annular sealing surface can cover the sealing surface of the first valve port 30.

[0063] Preferably, the valve core 14 is further provided with a baffle 141, which can prevent the valve cover 15 from falling off the valve core 14. The diameter of the baffle 141 is larger than the inner diameter of the annular sealing surface, and the diameter of the baffle 141 is smaller than the inner diameter of the first valve port 30.

[0064] Further, the valve cover 15 comprises, for example, a gland 151 and a sealing body 152. The sealing body 152 is used to seal the first valve port 30, and the gland 151 is arranged above the sealing body 152. When the valve cover 15 closes the first valve port 30, the sealing body 152 is arranged between the gland 151 and the first valve port 30, and is in close contact with the sealing surface of the first valve port 30. The bottom of the sealing body 152 can be provided with a sealing groove corresponding to the shape of the first valve port 30, or can be an elastic sealing member capable of deforming according to the shape of the first valve port 30.

[0065] For example, the bottom of the gland 151 is provided with a sealing groove, and the sealing body 152 is embedded in the sealing groove. The connection between the sealing body 152 and the gland 151 can be adhesive or direct clamping.

[0066] In a specific embodiment, the sealing body 152 is a rubber member. When the sealing body 152 is extruded by the gland 151, the sealing surface of the sealing body 152 can deform, so that the sealing surface of the sealing body 152 is adapted to the shape of the first valve port 30, and tightly contacts the sealing surface of the first valve port 30.

[0067] By arranging the valve cover 15 in the form of the sealing body 152 and the gland 151, when the valve cover 15 closes the first valve port 30, the gland 151 can extrude the sealing body 152, so that the sealing body 152 is more tightly contacted with the first valve port 30, and the sealing performance is better.

[0068] Further, in combination with Figure 6 The combination valve 100 further comprises a user joint 40. The user joint 40 is connected to the side of the electromagnetic valve 10 close to the gas source end 101. The user joint 40 is provided with an inner thread matched with a user pipeline, and the combination valve 100 is connected to the gas pipeline through the user joint 40.

[0069] It should be noted that the conventional gas self-closing valve is usually designed in one piece, and the gas self-closing valve is directly connected to the gas pipeline. Different user pipe diameters need to match different specifications of the gas self-closing valve. By setting the split type user joint 40 at the gas source end 101 of the electromagnetic valve 10, different specifications of the internal thread of the user joint 40 can be replaced according to different user pipe diameters, thereby improving the applicability of the combined valve 100.

[0070] Further, the user joint 40 is connected to the electromagnetic valve 10 through the snap spring 51. For example, the shape of the snap spring 51 is hexagonal.

[0071] Further, the combined valve 100 further comprises at least one sealing ring 52 arranged at the connection between the user joint 40 and the electromagnetic valve 10. Since the user joint 40 and the electromagnetic valve 10 are designed in a split type, the sealing performance of the connection between the user joint 40 and the electromagnetic valve 10 needs to be considered. By arranging at least one sealing ring 52 at the connection between the user joint 40 and the electromagnetic valve 10, the sealing performance of the connection between the user joint 40 and the electromagnetic valve 10 can be guaranteed, thereby avoiding gas leakage from the connection between the user joint 40 and the electromagnetic valve 10. In one specific embodiment, two sealing rings 52 are arranged at the connection between the user joint 40 and the electromagnetic valve 10.

[0072] Further, the present application provides a gas water heater 300. In combination with Figure 1 and Figure 11 The gas water heater 300 comprises any one of the combined valves 100 as described above, a water flow monitoring part 210, and a power adapter 220. The combined valve 100 is arranged on the gas pipeline of the gas water heater 300; the water flow monitoring part 210 is arranged on the water pipeline at the water inlet end or the water outlet end of the gas water heater 300, and is used for monitoring the water flow in real time; and the power adapter 220 is electrically connected to the controller 60 and the electromagnetic valve 10, and supplies power to the controller 60 and the electromagnetic valve 10.

[0073] In one specific embodiment, the water source 500 supplies water to the water pipeline of the gas water heater 300, and the gas source 400 supplies gas to the gas pipeline of the gas water heater 300. Specifically, the signal input end of the controller 60 is signal connected to the water flow monitoring part 210, and the controller 60 can control the opening and closing state of the gas safety valve 20 according to the water flow value obtained by the water flow monitoring part 210. For example, the controller 60 is a PLC controller, and the water flow monitoring part 210 is a water flow sensor arranged on the water outlet pipeline of the gas water heater 300. The PLC controller is electrically connected to the water flow monitoring part 210 through the first signal line 221; the PLC controller is electrically connected to the electromagnetic valve 10 through the second signal line 222; and the power adapter 220 supplies power to the PLC controller through the second power line 223.

[0074] It should be noted that when the gas water heater 300 is closed, the water switch of the water pipeline and the electromagnetic valve 10 on the gas pipeline will be closed synchronously with the gas water heater 300. However, sometimes there is unextinguished afterglow in the combustion chamber of the gas water heater 300, so that the gas near the combustion chamber side of the gas safety valve 20 is consumed by the unextinguished afterglow, thereby causing a pressure difference between the two ends of the gas safety valve 20, resulting in a false judgment of the gas safety valve 20, thinking that there is a leakage in the gas pipeline near the combustion chamber side of the gas safety valve 20, and then causing the gas safety valve 20 to be automatically closed due to the false judgment. The user needs to manually open the gas safety valve 20 before using the gas water heater 300, which is relatively troublesome to operate.

[0075] In order to solve the problem of false judgment of the gas safety valve 20 caused by unextinguished afterglow in the combustion chamber of the gas water heater 300, the applicant adds a water flow monitoring part 210 and a power adapter 220 on the basis of the original combined valve. The water flow monitoring part 210 is installed on the water pipeline of the water inlet end or the water outlet end of the gas water heater 300, and the water flow monitoring part 210 can monitor the water flow of the water pipeline of the gas water heater 300 in real time. The PLC controller can determine whether the gas water heater 300 is in the just closed state according to the water flow value obtained by the water flow monitoring part 210. The power adapter 220 is electrically connected to the PLC controller and provides working power for the PLC controller.

[0076] In one embodiment, when a pressure difference occurs between the two ends of the gas safety valve 20, the PLC controller can determine whether the water switch of the water pipeline is in the closed state according to the water flow value obtained by the water flow monitoring part 210, so that the PLC controller can determine whether the gas water heater 300 is in the just closed state according to the water flow value obtained by the water flow monitoring part 210, and then determine whether the pressure difference between the two ends of the gas safety valve 20 is caused by a real leakage in the gas pipeline near the combustion chamber side of the gas safety valve 20 or by unextinguished afterglow in the combustion chamber of the gas water heater 300. In this way, the false judgment of the gas safety valve 20 caused by unextinguished afterglow can be avoided, and the user's convenience in using the gas water heater 300 can be improved.

[0077] For example, if the water flow value is less than the flow threshold and the water flow change rate is greater than the first flow change rate, it is determined that the gas water heater 300 is in the just closed state.

[0078] Further, in combination with Figure 1 , the electromagnetic valve 10 is located at one end of the gas safety valve 20 near the gas source 400; the electromagnetic valve 10 is connected to the gas source 400 through the second gas pipeline 420, and the gas safety valve 20 is connected to the gas water heater 300 through the first gas pipeline 410.

[0079] Specifically, when the pressure difference between the first gas pipeline 410 side and the solenoid valve 10 side is greater than or equal to the first pressure threshold, the gas safety valve 20 determines that there is a leak at the first gas pipeline 410, and the gas safety valve 20 will automatically close to cut off the gas pipeline from the gas source 400 to the gas water heater 300.

[0080] Further, the present application provides a control method of a gas appliance, which is a gas water heater 300. In combination with the above-mentioned control method of the gas appliance, Figure 12 if the waterway flow value of the waterway pipeline of the gas water heater 300 is less than or equal to the flow threshold, the gas water heater 300 is determined to be closed, and the controller 60 controls the solenoid valve 10 to close with a delay of a first time length. For example, the first time length is in the range of 2-5 seconds, and the preferred value of the first time length is 3 seconds.

[0081] For example, if the waterway flow value of the waterway pipeline of the gas water heater 300 is less than or equal to the flow threshold, it is determined that the gas water heater 300 is in a closed state. To avoid the problem that when the solenoid valve 10 and the waterway switch are closed at the same time, the gas near the combustion chamber side of the gas safety valve 20 is consumed by the unextinguished afterfire, causing the gas safety valve 20 to be disturbed by the unextinguished afterfire and automatically closed, the controller 60 controls the solenoid valve 10 to close with a delay of a first time length when it is monitored that the gas water heater 300 is switched from an open state to a closed state.

[0082] In one specific embodiment, when the gas water heater 300 is turned on, it is first determined whether there is water in the waterway pipeline, that is, it is first determined whether the waterway of the gas water heater 300 is open. If the waterway of the gas water heater 300 is in an open state, the waterway flow value is used to determine whether to delay the closing of the solenoid valve 10.

[0083] Further, the control method of the gas appliance further comprises: obtaining the pressure difference between the first gas pipeline 410 side and the solenoid valve 10 side; determining whether the pressure difference is greater than or equal to a second pressure threshold; if yes, obtaining the waterway flow value of the waterway pipeline of the gas water heater 300, and determining the reason for the pressure difference being greater than or equal to the second pressure threshold according to the size relationship between the waterway flow value of the waterway pipeline of the gas water heater 300 and the flow threshold; wherein the second pressure threshold is less than the first pressure threshold.

[0084] Further, the reason for the pressure difference being greater than or equal to the second pressure threshold according to the size relationship between the waterway flow value of the waterway pipeline of the gas water heater 300 and the flow threshold comprises: if the waterway flow value of the waterway pipeline of the gas water heater 300 is less than or equal to the flow threshold, it is determined that the waterway switch of the waterway pipeline is in a closed state, and the reason for the pressure difference being greater than or equal to the second pressure threshold is that there is unextinguished afterfire in the gas water heater 300.

[0085] In one specific embodiment, in order to make the judgment more accurate, if the waterway flow value is less than the flow threshold value and the waterway flow rate is greater than the first flow rate, it is determined that the gas water heater is switched from the open state to the closed state, that is, it is determined that the reason why the pressure difference is greater than or equal to the second pressure threshold value is that there is unextinguished residual fire in the gas water heater 300, so the electromagnetic valve 10 is controlled to be closed for 3 seconds to avoid the pressure difference rising to greater than or equal to the first pressure threshold value, causing the gas safety valve 20 to be abnormally closed.

[0086] Further, according to the size relationship between the waterway flow value of the waterway pipeline of the gas water heater 300 and the flow threshold value, it is determined that the reason why the pressure difference is greater than or equal to the second pressure threshold value also includes: if the waterway flow value of the waterway pipeline of the gas water heater 300 is greater than the flow threshold value, it is determined that the waterway switch of the waterway pipeline is in the open state, and it is determined that the reason why the pressure difference is greater than or equal to the second pressure threshold value is that there is a leak at the first gas pipeline 410.

[0087] It can be understood that if the waterway flow value of the waterway pipeline of the gas water heater 300 is greater than the flow threshold value, it means that the waterway switch of the gas water heater 300 has not been closed, that is, it can be ruled out the possibility that the gas water heater 300 is switched from the open state to the closed state, and the unextinguished residual fire in the gas water heater 300 causes the pressure difference, so it is determined that there is a leak at the first gas pipeline 410, and an alarm signal is sent in advance to prompt the user to repair.

[0088] Preferably, the PLC controller integrates a wireless communication module, and the PLC controller can send the alarm signal to the user's mobile terminal such as a mobile phone, so that even if the user is not at home, the user can also receive the alarm signal of the gas leak and contact the maintenance personnel in time for repair.

[0089] Further, the power adapter 220 includes a 220V AC to 12V DC module and is equipped with a backup battery; when power is off, the backup battery can provide backup operating power for the PLC controller and the electromagnetic valve 10.

[0090] It can be understood that by configuring the power adapter 220 with a 220V AC to 12V DC module and a backup battery, the electromagnetic valve 10 and the PLC controller can be powered directly through the power adapter 220; when a power outage or other sudden power outage occurs, the backup battery can also provide operating power for the PLC controller and the water flow monitoring part 210, further improving the safety of the gas water heater 300.

[0091] In the description of the application, it needs to be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0092] Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art and related fields without creative labor should belong to the protection scope of the present application. The structures, devices and operation methods not specifically described and explained in the present application, if not specially described and limited, are implemented according to the conventional means in the art.

Claims

1. A control method for a gas appliance, characterised in that, The gas appliance is a gas water heater, and the gas appliance comprises: an ignition coil and a thermocouple; a combined valve arranged on a gas pipeline of the gas water heater and used for opening or cutting off the gas pipeline between a gas source and the gas appliance, the combined valve comprising a user end and a gas source end; the combined valve comprises a solenoid valve and a gas safety valve, the solenoid valve is arranged between the gas safety valve and the gas source end, and the solenoid valve is electrically connected with the ignition coil and the thermocouple; a water flow monitoring part arranged on a water pipeline of a water inlet end or a water outlet end of the gas water heater and used for monitoring water flow in real time; a controller, a signal input end of the controller being connected with the water flow monitoring part, and the controller being capable of controlling the solenoid valve to be closed according to a water flow value obtained by the water flow monitoring part; a power adapter electrically connecting the controller and the solenoid valve and supplying power to the controller and the solenoid valve; wherein the gas safety valve is connected with the gas water heater through a first gas pipeline, and the solenoid valve is connected with the gas source through a second gas pipeline. The control method of the gas appliance comprises: obtaining a pressure difference between the first gas pipeline side and the solenoid valve side; determining whether the pressure difference is greater than or equal to a second pressure threshold value; if yes, obtaining a water flow value of a water pipeline of the gas water heater, and if the water flow value of the water pipeline of the gas water heater is less than or equal to a flow threshold value and a water flow change rate is greater than a first flow change rate, it is determined that the gas water heater is just switched from an open state to a closed state, and there is unextinguished residual fire in the gas water heater, and the controller controls the solenoid valve to be closed with a delay of a first time length; wherein when the pressure difference between the first gas pipeline side and the solenoid valve side is greater than or equal to a first pressure threshold value, the gas safety valve is switched from an open state to a closed state; and the second pressure threshold value is less than the first pressure threshold value.

2. A control method for a gas appliance as claimed in claim 1 characterised in that, The solenoid valve comprises: a valve body provided with a first valve port; an electromagnetic assembly arranged in the valve body and electrically connected with the controller; a valve cover movably arranged above the first valve port and used for opening or closing the first valve port, and a spring arranged between the valve cover and the valve body and used for keeping the first valve port in a closed state when the gas safety valve is closed; a valve core, one end of the valve core being connected with the valve cover and the other end of the valve core being connected with the electromagnetic assembly, the valve core being capable of driving the valve cover to move up and down; a magnetic part arranged on one end of the valve body away from the valve cover and used for keeping the first valve port in an open state when the gas safety valve is opened.

3. A control method for a gas appliance as claimed in claim 2, characterised in that, The first valve port is an arc-shaped sealing surface, and the arc-shaped sealing surface comprises: a sealing flat surface; a first sealing inclined surface arranged on an outer side of the sealing flat surface and connected with the sealing flat surface in a circular arc manner; a second sealing arc surface arranged on an inner side of the sealing flat surface and connected with the sealing flat surface.

4. A control method for a gas appliance as claimed in claim 3 characterised in that, One side of the valve cover close to the first valve port is provided with an annular sealing surface, an inner diameter of the annular sealing surface is smaller than an inner diameter of the first valve port, and an outer diameter of the annular sealing surface is greater than an outer diameter of the first valve port, so that the annular sealing surface can cover the sealing surface of the first valve port.

5. A control method for a gas appliance as claimed in claim 3 characterised in that, The valve cover comprises: A sealing body is arranged to seal the first valve port; A pressure cover is arranged above the sealing body; When the valve cover closes the first valve port, the sealing body is arranged between the pressure cover and the first valve port, and is in close contact with the sealing surface of the first valve port.

6. A control method for a gas appliance as claimed in claim 1 characterised in that, The combined valve further comprises: A user joint is connected to the gas source end of the electromagnetic valve; The user joint is provided with an internal thread matched with the user pipeline, and the electromagnetic valve is connected to the user pipeline through the user joint.

7. A control method for a gas appliance as claimed in claim 6 characterised in that, The user joint is connected to the electromagnetic valve through a snap spring, and at least one sealing ring is arranged at the connection between the user joint and the gas source end.

8. A control method for a gas appliance as claimed in claim 1 characterised in that, Further comprising: If the water flow value of the water pipeline of the gas water heater is greater than the flow threshold value, it is determined that the reason why the pressure difference is greater than or equal to the second pressure threshold value is that there is leakage at the first gas pipeline, and an alarm signal is sent to prompt the user to repair.

9. A control method for a gas appliance as claimed in claim 8 characterised in that, The power adapter comprises a 220V AC to 12V DC module, and is provided with a backup battery; when the combined valve is powered off, the backup battery can provide backup working power for the controller and the electromagnetic valve.

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