Valve body safety control method and circuit and gas equipment

Abstract

The invention relates to the technical field of valve body control, and discloses a valve body safety control method and circuit and gas equipment, the method is applied to the gas equipment, and the method comprises the following steps: obtaining a water flow signal of the gas equipment in response to a water use operation of a user on the gas equipment; judging whether a fan of the gas equipment is started or not according to the water flow signal; when a draught fan of the gas equipment is started, current operation data of the draught fan are obtained; whether a gas valve of the gas equipment is opened or not is judged based on the current operation data; and when the gas valve of the gas equipment is opened, valve body detection is conducted on the gas valve, and opening or closing of the gas valve is controlled according to the valve body detection result. Safety control over opening or closing of the valve body is achieved through the comprehensive judgment result of the water flow signal of the gas equipment, the operation data of the draught fan and gas valve detection, the valve body control precision of the equipment in different operation states can be improved, and meanwhile the gas leakage risk is greatly reduced; and the operation safety of equipment and the personal safety of a user are guaranteed to a great extent.

Description

Technical Field

[0001] The present invention relates to the technical field of valve body control, and in particular to a valve body safety control method, circuit and gas equipment. Background Art

[0002] At present, with the popularization of natural gas, the importance of gas safety has attracted more and more attention from users. In actual applications, gas products that users often come into contact with include gas water heaters, gas wall-mounted boilers and gas stoves. When gas leaks from such gas products, if it reaches a certain concentration (usually 5% to 15%), it will explode when it encounters open flames or electric sparks, causing serious casualties and property losses; in addition, gas contains toxic gases such as carbon monoxide. Once leaked, these gases may be inhaled by the human body, causing poisoning or even death to the corresponding people.

[0003] In summary, gas safety is very important. Existing technologies often use gas equipment controllers, such as control panels or control chips, to detect abnormalities in gas valves. However, this type of detection method cannot detect abnormalities in gas valves when the controller fails, such as when the chip crashes, which in turn leads to the risk of gas leakage and makes it difficult to ensure the safe operation of gas equipment. Summary of the invention

[0004] In view of this, the present invention provides a valve body safety control method, circuit and gas equipment to solve the problem that it is difficult to achieve effective valve body safety control in existing gas equipment, resulting in the risk of gas leakage, which in turn seriously affects the safe operation of the equipment and the personal safety of users.

[0005] In a first aspect, the present invention provides a valve body safety control method, which is applied to gas equipment, and the method comprises:

[0006] Responding to the user's water operation on the gas equipment, obtaining the water flow signal of the gas equipment;

[0007] Determine whether to start the fan of the gas equipment according to the water flow signal;

[0008] When the fan of the gas equipment is turned on, the current operation data of the fan is obtained;

[0009] Determine whether to open the gas valve of the gas equipment based on the current operation data;

[0010] When the gas valve of the gas equipment is opened, the valve body of the gas valve is inspected, and the opening or closing of the gas valve is controlled according to the valve body inspection result.

[0011] The valve body safety control method provided by the present invention responds to the user's water use operation and uses the acquired water flow signal to determine whether to turn on the fan; when the fan is turned on, it determines whether to turn on the gas valve according to the fan operation data, performs valve body abnormality detection when the gas valve is turned on, and controls the opening or closing of the gas valve according to the valve body detection result. The valve body can be safely controlled according to the different operating states of the equipment, that is, based on the comprehensive judgment result of the water flow signal of the gas equipment, the fan operation data and the gas valve abnormality detection result, which significantly improves the valve body control accuracy of the equipment in different operating states, further improves the robustness of the valve body safety control, greatly reduces the risk of gas leakage, meets the demand for efficient use of the equipment, and at the same time ensures the personal safety of the user.

[0012] In an optional implementation, judging whether to start a fan of a gas device according to a water flow signal includes:

[0013] Perform abnormal detection on water flow signals;

[0014] If the water flow signal is normal, turn on the fan of the gas equipment;

[0015] If the water flow signal is abnormal, the fan of the gas equipment will not be turned on.

[0016] The present invention determines whether to start the fan by detecting the abnormality of the water flow signal, thereby ensuring the normal operation of the fan and further improving the safety control accuracy of the valve body.

[0017] In an optional implementation, performing abnormality detection on the water flow signal includes:

[0018] Detect whether the water flow signal belongs to the preset pulse signal;

[0019] If the water flow signal does not belong to the preset pulse signal, it is determined that the water flow signal is abnormal;

[0020] If the water flow signal belongs to the preset pulse signal, the current water flow is calculated based on the water flow signal to determine whether the current water flow meets the preset flow threshold range; when the current water flow does not meet the preset flow threshold range, the water flow signal is determined to be abnormal; when the current water flow meets the preset flow threshold range, the water flow signal is determined to be normal.

[0021] The present invention can significantly improve the detection accuracy of water flow signals by designing a dual judgment process of whether the water flow signal is a set pulse signal, calculating the current water flow based on the pulse signal when the water flow signal is a pulse signal, and judging whether the current water flow meets the preset flow threshold range.

[0022] In an optional implementation, the current operating data includes the fan current, the fan speed, and the fan voltage; and judging whether to open the gas valve of the gas equipment based on the current operating data includes:

[0023] Perform abnormal detection on fan current, fan speed and fan voltage respectively;

[0024] If the fan current, fan speed and fan voltage are normal, open the gas valve of the gas equipment;

[0025] If at least one of the fan current, fan speed and fan voltage is abnormal, the gas valve of the gas equipment will not be opened.

[0026] The present invention can ensure accurate opening of the gas valve by performing abnormal detection on various types of fan operation data including fan current, fan speed and fan voltage, and comprehensively determining whether to open the gas valve based on various detection results, thereby helping to improve the safety control accuracy of the valve body.

[0027] In an optional implementation, performing valve body detection on the gas valve and controlling the opening or closing of the gas valve according to the valve body detection result includes:

[0028] Get the current voltage of the gas valve;

[0029] Determine whether the valve body of the gas valve is abnormal based on the current voltage;

[0030] If the valve body is abnormal, the valve body of the control gas valve will be closed;

[0031] If the valve body is normal, the valve body of the control gas valve remains open.

[0032] The present invention determines whether there is an abnormality in the gas valve by the current voltage of the gas valve, thereby ensuring the accuracy of valve body detection and further ensuring the safe operation of the valve body.

[0033] In an optional implementation, before starting the fan and the gas valve of the gas equipment, the valve body safety control method further includes:

[0034] Respectively obtain a fan drive signal and a valve body drive signal, wherein the fan drive signal is used to provide speed configuration information, and the valve body drive signal is used to provide the desired valve body to be opened and its corresponding opening;

[0035] The fan of the gas equipment is started based on the fan driving signal, and the gas valve of the gas equipment is started based on the valve body driving signal.

[0036] The present invention opens the fan and the gas valve of the gas equipment accordingly through the fan drive signal and the valve body drive signal, thereby ensuring the flexible, efficient and safe operation of the gas equipment.

[0037] In a second aspect, the present invention provides a valve body safety control circuit, which is applied to gas equipment, and the circuit includes:

[0038] A signal input module, a fan operation module and a valve control module connected in sequence;

[0039] The signal input module is used to respond to the user's water operation on the gas device and obtain the water flow signal of the gas device;

[0040] The fan operation module is used to determine whether to turn on the fan of the gas equipment according to the water flow signal; when the fan of the gas equipment is turned on, the current operation data of the fan is obtained;

[0041] The valve body control module is used to determine whether to open the gas valve of the gas equipment based on the current operating data; when the gas valve of the gas equipment is opened, the valve body of the gas valve is detected, and the opening or closing of the gas valve is controlled according to the valve body detection result.

[0042] The valve body safety control circuit provided by the present invention realizes safety control of the valve body by setting a signal input module, a fan operation module and a valve body control module which are connected in sequence. It can significantly improve the valve body control accuracy of the gas equipment under different operating conditions, further improve the safety control performance of the valve body, and significantly reduce the risk of gas leakage. It not only meets the needs of efficient use of the equipment, but also ensures the personal safety of the user.

[0043] In an optional embodiment, the valve body safety control circuit also includes: a signal filtering module connected to the signal input module and the fan operation module respectively, for filtering the water flow signal output by the signal input module, and inputting the filtered water flow signal into the fan operation module.

[0044] The present invention filters the water flow signal through the signal filtering module, which can ensure the quality of the water flow signal, thereby improving the accuracy of the subsequent judgment on whether the fan is turned on.

[0045] In an optional implementation, the fan operation module includes a fan power drive unit, a fan power supply unit and a fan detection unit;

[0046] A fan power supply drive unit, used for generating a fan drive signal when the water flow signal is normal, wherein the fan drive signal is used for providing speed configuration information and starting the fan based on the speed configuration information;

[0047] A fan power supply unit, used for supplying power to the fan;

[0048] The fan detection unit is used to perform abnormality detection on the current operating data of the fan to obtain the fan detection result; wherein the current operating data includes the fan current, the fan speed and the fan voltage; the fan detection result includes the fan being normal and the fan being abnormal.

[0049] The present invention designs a fan operation module including a fan power supply drive unit, a fan power supply unit and a fan detection unit. Specifically, when the water flow signal is normal, the fan power supply drive unit is controlled to operate and then power is supplied to the fan through the fan power supply unit. The fan operation is determined by detecting abnormalities in operating data such as fan current, fan speed and fan voltage, thereby ensuring the safe operation of the fan.

[0050] In an optional embodiment, the valve body control module includes a valve body isolation drive unit, a valve body power supply unit and a valve body detection unit;

[0051] The valve body isolation drive unit is used to generate a valve body drive signal when the fan is detected to be normal, wherein the valve body drive signal is used to provide the valve body that is expected to be opened and its corresponding opening;

[0052] A valve body power supply unit, used to supply power to the gas valve;

[0053] The valve body detection unit is used to perform valve body detection and control the opening or closing of the gas valve according to the valve body detection result.

[0054] The present invention designs a valve body control module including a valve body isolation drive unit, a valve body power supply unit and a valve body detection unit. Specifically, when the fan is normal, the valve body isolation drive unit is controlled to work and then power is supplied to the gas valve through the valve body power supply unit. Valve body detection is performed and the opening or closing of the gas valve is controlled according to the valve body detection result. The safe operation of the gas valve is ensured, thereby improving the accuracy and efficiency of valve body safety control.

[0055] In an optional embodiment, the signal filtering module includes a first resistor, a first capacitor, a second resistor and a second capacitor; wherein the input ends of the first resistor and the first capacitor are respectively connected to the output end of the signal input module, and the output end of the first resistor is grounded; the output end of the first capacitor is connected to the input end of the second resistor; the output end of the second resistor is respectively connected to the fan operation module and the input end of the second capacitor; and the output end of the second capacitor is grounded.

[0056] The present invention can ensure the acquisition quality of the water flow signal by designing a corresponding circuit of a signal filtering module including a first resistor, a first capacitor, a second resistor and a second capacitor.

[0057] In an optional implementation, the valve body safety control circuit further includes:

[0058] The fan power supply drive unit includes a first transistor, a third resistor and a fourth resistor; wherein one end of the third resistor is connected to the base of the first transistor, and the other end is grounded; one end of the fourth resistor is connected to the collector of the first transistor, and the other end is connected to the fan power supply unit; the emitter of the first transistor is grounded;

[0059] The fan power supply unit includes a second transistor and a fifth resistor, wherein one end of the fifth resistor is connected to the base of the second transistor, and the other end is connected to the first power supply; the collector of the second transistor is connected to the fan, and the emitter is connected to the first power supply;

[0060] The fan detection unit includes a first crystal diode, a sixth resistor, a third crystal transistor, a second crystal diode, a seventh resistor, an eighth resistor, a fourth crystal transistor, a ninth resistor and a second power supply; wherein, the first crystal diode, the sixth resistor and the base of the third crystal transistor are connected in sequence to form a first input of a logic AND circuit, the collector of the third crystal transistor is connected in sequence to the ninth resistor and the second power supply, and the emitter of the third crystal transistor is connected to the collector of the fourth crystal transistor; the second crystal diode, the seventh resistor and the base of the fourth crystal transistor are connected in sequence to form a second input of the logic AND circuit, the two ends of the eighth resistor are respectively connected to the base and the emitter of the fourth crystal transistor, and the emitter of the fourth crystal transistor is grounded; the output of the logic AND circuit is connected to a preset low-pass filter unit, and the preset low-pass filter unit includes a tenth resistor and a third capacitor.

[0061] The present invention designs a corresponding circuit structure including a fan power supply drive unit, a fan power supply unit and a fan detection unit, which can provide a hardware-based risk parallel solution for fan operation. Through the corresponding hardware circuit, not only the safety performance of the gas valve can be improved, but also the safety and reliability of the fan operation can be enhanced.

[0062] In an optional implementation, the valve body safety control circuit further includes:

[0063] The valve body power supply unit includes a fifth transistor and an eleventh resistor, wherein one end of the eleventh resistor is respectively connected to the preset low-pass filter unit and the base of the fifth transistor, and the other end is connected to the emitter of the fifth transistor, and the emitter of the fifth transistor is connected to the third power supply; the collector of the fifth transistor is connected to the valve body isolation drive unit;

[0064] The valve body detection unit includes a twelfth resistor, a thirteenth resistor and a fourth capacitor, wherein one end of the twelfth resistor is connected to the gas valve and the other end is grounded; the thirteenth resistor and the fourth capacitor form a sampling filter circuit, and the sampling filter circuit is respectively connected to the twelfth resistor and the controller of the gas equipment;

[0065] The valve body isolation driving unit includes a sixth transistor, a fourteenth resistor, a seventh transistor, a fifteenth resistor, a valve body isolation driving capacitor, a sixteenth resistor, a third transistor and a seventeenth resistor; wherein, the emitter of the sixth transistor is connected to the collector of the fifth transistor, the collector is connected to the gas valve, and the base is connected to the fourteenth resistor; the other end of the fourteenth resistor is connected to the collector of the seventh transistor; the emitter of the seventh transistor is grounded, and the base of the seventh transistor is connected to the fifteenth resistor, the valve body isolation driving capacitor, the sixteenth resistor and the controller in sequence; the input end of the third transistor is grounded; the output end is connected to the valve body isolation driving capacitor; the seventeenth resistor is respectively connected to the emitter and base of the seventh transistor.

[0066] The present invention designs a corresponding circuit structure including a valve body isolation drive unit, a valve body power supply unit and a valve body detection unit, which can provide a hardware-based risk series connection solution for gas valve operation. The gas valve can be safely protected from three directions of water flow safety, fan operating conditions and valve body operating conditions through the corresponding hardware circuit. That is, when fan abnormalities, wind pressure abnormalities, chip crashes, water flow abnormalities, etc. occur, the valve body power supply is directly cut off through the hardware circuit, so that the valve body is in a safely disconnected state, thereby achieving the purpose of preventing gas leakage.

[0067] In a third aspect, the present invention provides a gas device, comprising: a fan, a gas valve and a controller, wherein the controller comprises a memory and a processor, the memory and the processor are communicatively connected to each other, computer instructions are stored in the memory, and the processor executes the valve body safety control method of the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0068] In an optional embodiment, the gas appliance is a gas water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0070] Figure 1 is a flow chart of a valve body safety control method according to an embodiment of the present invention;

[0071] Figure 2 is a flow chart of another valve body safety control method according to an embodiment of the present invention;

[0072] Figure 3is a structural block diagram of a valve body safety control circuit according to an embodiment of the present invention;

[0073] Figure 4 is a structural block diagram of another valve body safety control circuit according to an embodiment of the present invention;

[0074] Figure 5 It is the principle diagram of the valve body safety control circuit;

[0075] Figure 6 It is a logical diagram of the valve body safety control circuit;

[0076] Figure 7 It is a schematic diagram of the composition of the valve body safety control system;

[0077] Figure 8 It is the working schematic diagram of the valve body safety control system;

[0078] Fig. 9 It is a working schematic diagram based on the hardware valve body protection solution;

[0079] Fig.10 This is a working diagram based on the MCU valve control solution;

[0080] Fig.11 It is a schematic diagram of the structure of a controller of a gas device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0081] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0082] According to an embodiment of the present invention, a valve body safety control method embodiment is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0083] In this embodiment, a valve body safety control method is provided, which is applied to gas equipment. Figure 1 is a flow chart of a valve body safety control method according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0084] Step S101, in response to a user's water use operation on a gas device, a water flow signal of the gas device is obtained.

[0085] In this embodiment, the specific type of gas equipment and the user's water use operation are not limited here, and can be adaptively adjusted according to actual needs. For example, the gas equipment includes a gas water heater, a gas wall-mounted boiler, etc.; the user uses hot water by turning on the faucet configured for the gas water heater; or the user sets the operation panel of the gas wall-mounted boiler accordingly to achieve the purpose of water use, which is only an example.

[0086] It should be noted that the water flow signal in this embodiment is obtained by detecting related sensors, that is, once the user uses water, the water flow signal can be obtained through the water flow sensor.

[0087] Step S102, judging whether to turn on the fan of the gas equipment according to the water flow signal.

[0088] In this embodiment, a risk series connection scheme is designed, that is, the fan is powered on after confirming that the water flow is normal, so that the safe operation of the fan can be guaranteed.

[0089] Step S103, when the fan of the gas equipment is turned on, the current operation data of the fan is obtained.

[0090] In this embodiment, the specific content of the current operating data is not limited here, and can be adaptively adjusted according to actual needs. For example, the current operating data includes the current speed of the fan, which is only used as an exemplary description.

[0091] Step S104, judging whether to open the gas valve of the gas equipment based on the current operation data.

[0092] In this embodiment, the gas valve of the gas equipment can be opened only when all current operating data are normal, which helps to ensure the safe operation of the gas valve.

[0093] Step S105, when the gas valve of the gas equipment is opened, the valve body of the gas valve is inspected, and the opening or closing of the gas valve is controlled according to the valve body inspection result.

[0094] In this embodiment, the valve body detection result is used to indicate whether the gas valve is abnormal, and the valve body is directly closed when the gas valve is abnormal.

[0095] The valve body safety control method of the embodiment of the present invention can realize the safety control of the valve body based on the comprehensive judgment result of the water flow signal of the gas equipment, the fan operation data and the gas valve abnormality detection result, which significantly improves the valve body control accuracy of the equipment under different operating conditions, further improves the robustness of the valve body safety control, greatly reduces the risk of gas leakage, meets the efficient use requirements of the equipment, and ensures the personal safety of the user.

[0096] In this embodiment, a valve body safety control method is provided, which is applied to gas equipment. Figure 2 FIG. 1 is a flow chart of another valve body safety control method according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0097] Step S201, responding to the user's water use operation on the gas device, obtaining the water flow signal of the gas device. Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0098] Step S202, judging whether to start the fan of the gas equipment according to the water flow signal.

[0099] Specifically, the above step S202 includes:

[0100] Step S2021, performing abnormality detection on the water flow signal.

[0101] Specifically, the above step S2021 includes:

[0102] Step a1, detecting whether the water flow signal belongs to a preset pulse signal.

[0103] In this embodiment, the specific content of the preset pulse signal can be adaptively adjusted according to actual needs. For example, the preset pulse signal is a square wave pulse, which is only used as an example.

[0104] Step a2: if the water flow signal does not belong to the preset pulse signal, it is determined that the water flow signal is abnormal.

[0105] Step a3, if the water flow signal belongs to the preset pulse signal, the current water flow is calculated based on the water flow signal to determine whether the current water flow meets the preset flow threshold range; when the current water flow does not meet the preset flow threshold range, the water flow signal is determined to be abnormal; when the current water flow meets the preset flow threshold range, the water flow signal is determined to be normal.

[0106] In this embodiment, the specific value of the preset flow threshold range is adaptively adjusted according to actual needs, such as the preset flow threshold range is a normal value range of water flow calibrated offline.

[0107] In the embodiment of the present invention, the detection accuracy of the water flow signal can be significantly improved by designing a dual judgment process of whether the water flow signal is a set pulse signal, calculating the current water flow rate based on the water flow signal when the water flow signal is a pulse signal, and judging whether the current water flow rate meets the preset flow threshold range.

[0108] Step S2022: If the water flow signal is normal, turn on the fan of the gas equipment.

[0109] Step S2023: if the water flow signal is abnormal, the fan of the gas equipment is not turned on.

[0110] In the embodiment of the present invention, whether to start the fan is determined by detecting the abnormality of the water flow signal, which can ensure the normal operation of the fan and further improve the safety control accuracy of the valve body.

[0111] Step S203, when the fan of the gas equipment is turned on, the current operation data of the fan is obtained. Figure 1 Step S103 of the illustrated embodiment will not be described in detail here.

[0112] Step S204: determining whether to open the gas valve of the gas equipment based on the current operation data.

[0113] In this embodiment, the current operating data includes the fan current, the fan speed and the fan voltage.

[0114] Specifically, the above step S204 includes:

[0115] Step S2041, performing abnormality detection on the fan current, fan speed and fan voltage respectively.

[0116] In this embodiment, the specific means of detecting abnormalities of the fan current, fan speed and fan voltage are not limited here, and can be determined according to conventional detection means in the art. For example, the wind pressure switch signal is detected, and the presence of wind pressure indicates that the fan starts to work; then the fan current and speed are collected and compared. Under normal circumstances, the fan current and fan speed are proportional to each other. When the speed does not match the current or the speed is too low, an error is reported, which is only an exemplary description.

[0117] Step S2042: If the fan current, fan speed and fan voltage are all normal, the gas valve of the gas equipment is opened.

[0118] Step S2043: if at least one of the fan current, the fan speed and the fan voltage is abnormal, the gas valve of the gas equipment is not opened.

[0119] In the embodiment of the present invention, by performing abnormal detection on various types of fan operation data including fan current, fan speed and fan voltage, and comprehensively determining whether to open the gas valve based on various detection results, the accurate opening of the gas valve can be ensured, which helps to improve the safety control accuracy of the valve body.

[0120] Step S205, when the gas valve of the gas equipment is opened, the valve body of the gas valve is inspected, and the opening or closing of the gas valve is controlled according to the valve body inspection result.

[0121] Specifically, in the above step S205, the gas valve is tested for valve body, and the opening or closing of the gas valve is controlled according to the valve body test result, including:

[0122] Step S2051, obtaining the current voltage of the gas valve.

[0123] Step S2052: determine whether the valve body of the gas valve is abnormal based on the current voltage.

[0124] In actual applications, the voltage detected by the valve body of the gas valve when it is open circuit and short circuit is different. This embodiment uses the current voltage of the gas valve to determine the abnormality of the valve body.

[0125] Step S2053: If the valve body is abnormal, the valve body of the gas valve is controlled to be closed.

[0126] Step S2054: If the valve body is normal, the valve body of the gas valve is controlled to remain open.

[0127] In the embodiment of the present invention, whether there is an abnormality in the gas valve is determined by the current voltage of the gas valve, which can ensure the accuracy of valve body detection and further ensure the safe operation of the valve body.

[0128] It should be noted that when using gas equipment in practice, such as the opening of the fan and gas valve in a gas water heater, the MCU (Microcontroller Unit, a core control unit of a gas water heater, responsible for processing various sensor inputs, controlling heating elements, adjusting water temperature and gas volume, etc., to ensure the normal operation of the water heater) is required to provide corresponding drive signals. Therefore, before turning on the fan and gas valve of the gas equipment, the valve body safety control method of this embodiment also includes:

[0129] Step b1, respectively acquiring a fan drive signal and a valve drive signal, wherein the fan drive signal is used to provide speed configuration information, and the valve drive signal is used to provide a desired valve opening and its corresponding opening.

[0130] In this embodiment, the MCU provides a fan drive signal and a valve body drive signal.

[0131] Step b2, starting the fan of the gas equipment based on the fan driving signal, and opening the gas valve of the gas equipment based on the valve body driving signal.

[0132] In the embodiment of the present invention, the fan and the gas valve of the gas equipment are opened accordingly through the fan drive signal and the valve body drive signal, thereby ensuring the flexible, efficient and safe operation of the gas equipment.

[0133] The present invention provides a valve body safety control circuit, which is applied to gas equipment, such as Figure 3As shown, the circuit includes: a signal input module 1, a fan operation module 2 and a valve body control module 3 connected in sequence; wherein the signal input module 1 is used to respond to the user's water use operation on the gas equipment and obtain the water flow signal of the gas equipment; the fan operation module 2 is used to determine whether to turn on the fan of the gas equipment according to the water flow signal; when the fan of the gas equipment is turned on, the current operation data of the fan is obtained; the valve body control module 3 is used to determine whether to turn on the gas valve of the gas equipment based on the current operation data; when the gas valve of the gas equipment is turned on, the gas valve is subjected to valve body detection, and the opening or closing of the gas valve is controlled according to the valve body detection result.

[0134] The valve body safety control circuit of the embodiment of the present invention realizes safety control of the valve body by setting a signal input module, a fan operation module and a valve body control module which are connected in sequence, which can significantly improve the valve body control accuracy of the gas equipment under different operating conditions, further improve the safety control performance of the valve body, and significantly reduce the risk of gas leakage, which not only meets the demand for efficient use of the equipment, but also ensures the personal safety of the user.

[0135] In this embodiment, Figure 4 FIG. 1 is a structural block diagram of another valve body safety control circuit according to an embodiment of the present invention. Figure 4 It can be seen that the valve body safety control circuit of this embodiment further includes: a signal filtering module 4 connected to the signal input module 1 and the fan operation module 2, respectively, for filtering the water flow signal output by the signal input module 1, and inputting the filtered water flow signal into the fan operation module 2. Specifically, by filtering the water flow signal through the signal filtering module, the quality of the water flow signal can be guaranteed, thereby improving the accuracy of the subsequent judgment on whether the fan is turned on.

[0136] In this embodiment, see Figure 4 The fan operation module 2 includes a fan power supply drive unit 21, a fan power supply unit 22 and a fan detection unit 23; the fan power supply drive unit 21 is used to generate a fan drive signal when the water flow signal is normal, wherein the fan drive signal is used to provide speed configuration information and start the fan based on it; the fan power supply unit 22 is used to power the fan; the fan detection unit 23 is used to perform abnormal detection on the current operation data of the fan to obtain the fan detection result; wherein the current operation data includes the fan current, the fan speed and the fan voltage; the fan detection result includes the fan being normal and the fan being abnormal. Specifically, by designing a fan operation module including a fan power supply drive unit, a fan power supply unit and a fan detection unit, when the water flow signal is normal, the fan power supply drive unit is controlled to work and then the fan is powered by the fan power supply unit, and by detecting abnormalities in the operation data such as the fan current, the fan speed and the fan voltage, it is determined whether the fan is operating normally, thereby ensuring the safe operation of the fan.

[0137] In this embodiment, see Figure 4 The valve body control module 3 includes a valve body isolation drive unit 31, a valve body power supply unit 32 and a valve body detection unit 33; wherein the valve body isolation drive unit 31 is used to generate a valve body drive signal when the fan is detected to be normal, wherein the valve body drive signal is used to provide the desired valve body and its corresponding opening; the valve body power supply unit 32 is used to power the gas valve; the valve body detection unit 33 is used to perform valve body detection and control the opening or closing of the gas valve according to the valve body detection result. Specifically, by designing a valve body control module including a valve body isolation drive unit, a valve body power supply unit and a valve body detection unit, specifically when the fan is normal, the valve body isolation drive unit is controlled to work and then the gas valve is powered by the valve body power supply unit, the valve body is detected and the opening or closing of the gas valve is controlled according to the valve body detection result, the safe operation of the gas valve can be ensured, thereby improving the accuracy and efficiency of valve body safety control.

[0138] In this embodiment, Figure 5 This is a schematic diagram of the valve body safety control circuit. It should be noted that the letter "R" in the figure represents a resistor, and the corresponding number is marked according to the number of resistors used, such as R1 for the first resistor; the letter "C" represents a capacitor, the letter "Q" represents a transistor, the letter "D" represents a diode, and the letter "VCC" represents a power supply. Figure 5 Further description of the content is as follows:

[0139] 1. Water flow signal: When the water point of the gas equipment uses water, the generated water flow generates a water flow signal through the Hall sensor.

[0140] 2. R1 is the discharge circuit.

[0141] 3. C1 is a pulse coupling capacitor, which has the characteristic of blocking DC and passing AC.

[0142] 4. C2 and R2 form a low-pass filter unit.

[0143] 5. Transistors Q1, Q3, Q4 and Q7 are NPN-type driving transistors (commonly used in circuits that require high-level conduction, that is, when the input signal at the control end is high, the NPN transistor is turned on); transistors Q2, Q5 and Q6 are PNP-type driving transistors (commonly used in circuits that require low-level conduction, that is, when the input signal at the control end is low, the PNP transistor is turned on); it should be noted that the specific characteristics of NPN-type transistors and PNP-type transistors can be understood by referring to the relevant known contents in the field.

[0144] 6. R3 is the lower bias resistor of transistor Q1.

[0145] 7. R5 is the bias resistor of transistor Q2.

[0146] 8. R4 is the current limiting resistor.

[0147] 9. VCC1 is the power supply for the fan; VCC2 is the power supply for the AND gate; VCC3 is the power supply for the valve body; VCC2 and VCC3 are equal.

[0148] 10. D1 and D2 are ordinary diodes.

[0149] 11. R6 and R7 are the current limiting resistors of transistors Q3 and Q4 respectively.

[0150] 12. R8 is the lower bias resistor of transistor Q4.

[0151] 13. R9 is the current limiting resistor.

[0152] 14. R10 and C3 form a low-pass filter unit.

[0153] 15. R11 is the bias resistor of transistor Q5.

[0154] 16. R14 is the current limiting resistor.

[0155] 17. R12 is the current sampling resistor of the gas valve.

[0156] 18. R13 and C4 form a sampling filter, and the filtered signal is provided to the MCU.

[0157] 19. R15 is the current limiting resistor.

[0158] 20. D3 is a freewheeling diode.

[0159] 21. EC1 is the valve body isolation drive capacitor.

[0160] 22. R16 is the capacitor charging resistor.

[0161] 23. R17 is the bias resistor of transistor Q7.

[0162] Special instructions:

[0163] 1. Transistors Q3 and Q4 form a parallel and relationship, that is, Q3 is turned on when the fan has speed feedback, and Q4 is turned on when the wind pressure signal is detected. At this time, Q5 is turned on to complete the power supply of the valve body;

[0164] 2. Transistors Q5 and Q6 form a series relationship, that is, after Q5 opens the valve body and is energized, the MCU provides valve body drive, and the valve body can be opened;

[0165] 3. MCU provides a square wave drive signal for the valve body. When the signal is at a high level, EC1 is charged through R16. Since the RC constant is larger than the high level of the square wave, after the high level passes through EC1, transistor Q7 is turned on through R15. After transistor Q7 is turned on, transistor Q6 is turned on. When the square wave drive signal is at a low level, EC1 passes through R16 to the MCU ground, and then returns to the negative electrode of EC1 through D3 to complete the discharge. At this time, R15 is at a low level, transistor Q7 is turned off, transistor Q6 is turned off, and then the valve body of the gas valve is closed.

[0166] 4. In order to save power consumption and adjust the valve opening, MCU uses square wave pulse to drive the valve body.

[0167] In this embodiment, see Figure 5 The signal filtering module 4 includes a first resistor R1, a first capacitor C1, a second resistor R2 and a second capacitor C2; wherein the input ends of the first resistor R1 and the first capacitor C1 are respectively connected to the output end of the signal input module 1, and the output end of the first resistor R1 is grounded; the output end of the first capacitor C1 is connected to the input end of the second resistor R2; the output end of the second resistor R2 is respectively connected to the input end of the fan operation module 2 and the second capacitor C2; the output end of the second capacitor C2 is grounded. Specifically, by designing the corresponding circuit of the signal filtering module including the first resistor, the first capacitor, the second resistor and the second capacitor, the acquisition quality of the water flow signal can be guaranteed.

[0168] In this embodiment, see Figure 5 The fan operation module 2 in the valve body safety control circuit also includes:

[0169] 1. The fan power supply drive unit 21 includes a first transistor Q1, a third resistor R3 and a fourth resistor R4; wherein one end of the third resistor R3 is connected to the base of the first transistor Q1, and the other end is grounded; one end of the fourth resistor R4 is connected to the collector of the first transistor Q1, and the other end is connected to the fan power supply unit 22; the emitter of the first transistor Q1 is grounded;

[0170] 2. The fan power supply unit 22 includes a second transistor Q2 and a fifth resistor R5, wherein one end of the fifth resistor R5 is connected to the base of the second transistor Q2, and the other end is connected to the first power supply VCC1; the collector of the second transistor Q2 is connected to the fan, and the emitter is connected to the first power supply VCC1;

[0171] 3. The fan detection unit 23 includes a first crystal diode D1, a sixth resistor R6, a third crystal transistor Q3, a second crystal diode D2, a seventh resistor R7, an eighth resistor R8, a fourth crystal transistor Q4, a ninth resistor R9 and a second power supply VCC2; wherein, the first crystal diode D1, the sixth resistor R6 and the base of the third crystal transistor Q3 are connected in sequence to form a first input of a logic AND circuit, the collector of the third crystal transistor Q3 is connected in sequence to the ninth resistor R9 and the second power supply VCC2, and the emitter of the third crystal transistor Q3 is connected to the collector of the fourth crystal transistor Q4; the second crystal diode D2, the seventh resistor R7 and the base of the fourth crystal transistor Q4 are connected in sequence to form a second input of the logic AND circuit, the two ends of the eighth resistor R8 are respectively connected to the base and the emitter of the fourth crystal transistor Q4, and the emitter of the fourth crystal transistor Q4 is grounded; the output of the logic AND circuit is connected to a preset low-pass filter unit, and the preset low-pass filter unit includes a tenth resistor R10 and a third capacitor C3. Specifically, in this embodiment, a corresponding circuit structure including a fan power supply drive unit, a fan power supply unit and a fan detection unit is designed, which can provide a hardware-based risk parallel solution for fan operation. Through the corresponding hardware circuit, not only the safety performance of the gas valve can be improved, but also the safety and reliability of the fan operation can be enhanced.

[0172] In this embodiment, see Figure 5 The valve body control module 3 in the valve body safety control circuit also includes:

[0173] 1. The valve body power supply unit 32 includes a fifth transistor Q5 and an eleventh resistor R11, wherein one end of the eleventh resistor R11 is respectively connected to the preset low-pass filter unit and the base of the fifth transistor Q5, and the other end is connected to the emitter of the fifth transistor Q5, and the emitter of the fifth transistor Q5 is connected to the third power supply VCC3; the collector of the fifth transistor Q5 is connected to the valve body isolation drive unit 31;

[0174] 2. The valve body detection unit 33 includes a twelfth resistor R12, a thirteenth resistor R13 and a fourth capacitor C4, wherein one end of the twelfth resistor R12 is connected to the gas valve, and the other end is grounded; the thirteenth resistor R13 and the fourth capacitor C4 form a sampling filter circuit, and the sampling filter circuit is respectively connected to the twelfth resistor R12 and the controller MCU of the gas equipment;

[0175] 3. The valve body isolation driving unit 31 includes a sixth transistor Q6, a fourteenth resistor R14, a seventh transistor Q7, a fifteenth resistor R15, a valve body isolation driving capacitor EC1, a sixteenth resistor R16, a third transistor D3 and a seventeenth resistor R17; wherein, the emitter of the sixth transistor Q6 is connected to the collector of the fifth transistor Q5, the collector is connected to the gas valve, and the base is connected to the fourteenth resistor R14; the other end of the fourteenth resistor R14 is connected to the collector of the seventh transistor Q7; the emitter of the seventh transistor Q7 is grounded, and the base of the seventh transistor Q7 is connected to the fifteenth resistor R15, the valve body isolation driving capacitor EC1, the sixteenth resistor R16 and the controller MCU in sequence; the input end of the third transistor D3 is grounded; the output end is connected to the valve body isolation driving capacitor EC1; the seventeenth resistor R17 is respectively connected to the emitter and base of the seventh transistor Q7. Specifically, in this embodiment, a corresponding circuit structure including a valve body isolation drive unit, a valve body power supply unit and a valve body detection unit is designed, which can provide a hardware-based risk series scheme for gas valve operation. The gas valve can be safely protected from three directions of water flow safety, fan operating conditions and valve body operating conditions through the corresponding hardware circuit. That is, when the fan abnormality, wind pressure abnormality, chip crash, water flow abnormality, etc. occur, the valve body power supply is directly cut off through the hardware circuit, so that the valve body is in a safe disconnected state, thereby achieving the purpose of preventing gas leakage.

[0176] In one specific embodiment, see Figure 6 , provides a multiple safety protection scheme at the gas water heater controller end, that is, a scheme for safely cutting off the gas valve by hardware multi-level protection. This scheme protects the safety of the gas valve from three aspects: water flow safety, fan working condition, and valve body working condition. It is used to ensure that when the fan or wind pressure is abnormal, the chip crashes, or the water flow is abnormal, the valve body power supply is directly cut off through the designed hardware circuit, and then the valve body is in a safe disconnection state to achieve gas safety protection. Specifically, this scheme ensures the safety and reliability of each level by connecting and judging the risks that may cause gas leakage from the valve body in series and in parallel.

[0177] It should be explained that the risk series connection in this embodiment refers to the process of judging the power supply of the fan after confirming that the water flow is normal; the risk parallel connection means that after the fan is turned on normally, it is necessary to detect the current of the fan, the fan speed and the fan pressure at the same time, and subsequent operations will be performed only after all three are normal.

[0178] In a specific embodiment, the gas equipment is a gas water heater, and a valve body safety control system is provided to prevent gas leakage in the gas water heater. Figure 7The system consists of: the system is started by a water flow signal, that is, when the user starts to use water, the fan power supply is turned on to power the fan, and at the same time, the MCU provides a fan drive solution (such as setting the fan speed information); after the fan is turned on, the fan feeds back a real-time speed signal, and the fan wind pressure is collected to generate a wind pressure signal (note: the fan speed is determined by the output of the Hall sensor; the wind pressure signal is a switch signal, the principle is to use a hose on the air duct to obtain the "wind force" or pressure generated when the fan rotates, and apply it to the switch through the hose; when the pressure value reaches a certain threshold, the switch is closed to generate a wind pressure signal); when the two signals are normal, the valve body power supply is turned on to power the valve body, and at the same time, the MCU provides a valve body isolation drive solution (that is, which valve bodies are turned on and the corresponding valve body opening conditions); the valve body executes according to the drive solution controlled by the MCU; the MCU collects the working conditions of the valve body for valve body detection, which is used to judge and adjust the valve body, thereby ensuring the stable operation of the hidden water heater.

[0179] In one specific embodiment, see Figure 8 The working principle of the valve body safety control system is as follows: when the user uses water, a pulse water flow signal is generated through the Hall sensor, and the signal is low-pass filtered to generate a DC signal (C1 is used to isolate DC interference and couple the pulse signal to the next stage) to drive the transistor Q1 to turn on; after the transistor Q1 is turned on, the transistor Q2 is directly driven to turn on (the transistors in this embodiment can be replaced by MOS, IGBT and other electronic tubes); the fan is powered, that is, the fan power supply supplies power to the fan, and at this time, the fan drive solution provided by the MCU enables the fan to turn on; the speed signal and wind pressure of the fan operation are fed back, and when both are normal, the valve body power supply is turned on by hardware, that is, Q5 is turned on; when the MCU detects that the fan speed, wind pressure signal and fan current are all normal, a valve body drive solution (that is, MCU drive) is provided to open the gas valve; and when there is no abnormality in the valve body detection, it works normally to provide hot water.

[0180] In one specific embodiment, see Fig. 9 , based on the specific working principle of the hardware valve body protection solution, including:

[0181] 1. When the water flow signal is abnormal, Q1 cannot be opened and the fan cannot be powered; when there is no speed and no wind pressure feedback, the valve body cannot be powered, and then the valve body is closed to put it in a safe closed state;

[0182] 2. When the fan is working, if only one of the fan speed and wind pressure is normal or both are abnormal, the valve body shall not be energized, and then the valve body shall be closed to put it in a safe closed state;

[0183] 3. When the fan is working normally, the valve body is energized. When the MCU drive is abnormal / MCU crashes, the valve body is not energized, and the valve body is closed to put it in a safe closed state.

[0184] In one specific embodiment, see Fig.10 The specific working principle of the MCU valve body control solution includes: when there is a water flow signal, water flow detection is performed; when the water flow is abnormal, the MCU reports an error; when the water flow is normal, the fan is driven to turn on, and after the fan is turned on, the fan current, fan speed and fan pressure are detected. When they all meet the working logic (that is, the fan current, fan speed and fan pressure detection are all normal), the MCU provides a valve body drive signal to open the valve body, otherwise the MCU reports an error; when the valve body is opened, the valve body is detected; when the valve body is detected to be normal, the whole machine works normally; when the valve body is abnormal, an error is reported, among which the valve body abnormal conditions include valve body short circuit, excessive current and valve body open circuit.

[0185] In summary, the valve body safety control system of this embodiment has the following advantages:

[0186] 1. When a risk occurs to the gas water heater, the power supply of the valve body can be directly cut off, and then the valve body can be closed without MCU operation;

[0187] 2. When an abnormality occurs, the power supply to the valve body can be cut off only through multiple hardware protection circuits without software identification;

[0188] 3. When the MCU is working normally, it can monitor the working conditions of each load; when the MCU crashes, the power supply of the valve body can be directly cut off based on the hardware protection circuit, thereby avoiding the risk of gas leakage.

[0189] The present invention also provides a gas device, which includes a fan, a gas valve and a controller. Fig.11 , Fig.11 is a schematic diagram of the structure of the controller provided in an optional embodiment of the present invention, such as Fig.11 As shown, the controller includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the controller, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple controllers can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Fig.11 A processor 10 is taken as an example.

[0190] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0191] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0192] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the controller, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the controller via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0193] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0194] The controller also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0195] The input device 30 can receive input digital or character information, and generate signal input related to the user settings and function control of the thermal power unit operation control unit, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator rod, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device may be a touch screen.

[0196] In this embodiment, the gas equipment is a gas water heater. Specifically, the valve body safety control method of this embodiment is integrated on the gas equipment, so that this type of gas equipment has a very stable and reliable valve body safety control effect, and can control the opening or closing of the valve body according to different operating states of the equipment, that is, based on the water flow signal of the gas equipment, the operating data of the fan and the comprehensive judgment result of the gas valve detection, which can significantly improve the valve body control accuracy of the equipment in different operating states, while reducing the risk of gas leakage, meeting the efficient use requirements of the equipment, and greatly ensuring the personal safety of users.

[0197] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A valve body safety control method, applied to gas equipment, characterized in that: The method comprises: In response to a user's water use operation on a gas device, obtaining a water flow signal of the gas device; Determining whether to turn on the fan of the gas equipment according to the water flow signal; When the fan of the gas equipment is turned on, current operation data of the fan is obtained; Determining whether to open the gas valve of the gas equipment based on the current operation data; When the gas valve of the gas equipment is opened, the valve body of the gas valve is detected, and the opening or closing of the gas valve is controlled according to the valve body detection result.

2. The valve body safety control method according to claim 1, characterized in that: The method of judging whether to start the fan of the gas equipment according to the water flow signal comprises: Performing abnormality detection on the water flow signal; If the water flow signal is normal, turning on the fan of the gas equipment; If the water flow signal is abnormal, the fan of the gas equipment will not be turned on.

3. The valve body safety control method according to claim 2, characterized in that: The abnormality detection of the water flow signal comprises: Detecting whether the water flow signal belongs to a preset pulse signal; If the water flow signal does not belong to the preset pulse signal, determining that the water flow signal is abnormal; If the water flow signal belongs to a preset pulse signal, the current water flow is calculated based on the water flow signal to determine whether the current water flow meets the preset flow threshold range; when the current water flow does not meet the preset flow threshold range, the water flow signal is determined to be abnormal; when the current water flow meets the preset flow threshold range, the water flow signal is determined to be normal.

4. The valve body safety control method according to claim 1, characterized in that: The current operation data includes fan current, fan speed and fan voltage; and judging whether to open the gas valve of the gas equipment based on the current operation data includes: Perform abnormal detection on fan current, fan speed and fan voltage respectively; If the fan current, the fan speed and the fan voltage are all normal, opening the gas valve of the gas equipment; If at least one of the fan current, the fan speed and the fan voltage is abnormal, the gas valve of the gas equipment is not opened.

5. The valve body safety control method according to claim 1, characterized in that: The performing valve body detection on the gas valve and controlling the opening or closing of the gas valve according to the valve body detection result includes: Obtaining the current voltage of the gas valve; Determining whether the valve body of the gas valve is abnormal based on the current voltage; If the valve body is abnormal, the valve body of the gas valve is controlled to be closed; If the valve body is normal, the valve body of the gas valve is controlled to remain open.

6. The valve body safety control method according to claim 1, characterized in that: Before starting the fan and the gas valve of the gas equipment, the method further includes: Respectively acquiring a fan drive signal and a valve drive signal, wherein the fan drive signal is used to provide speed configuration information, and the valve drive signal is used to provide a desired valve body to be opened and its corresponding opening; The fan of the gas equipment is started based on the fan driving signal, and the gas valve of the gas equipment is started based on the valve body driving signal.

7. A valve body safety control circuit, applied to gas equipment, characterized in that: The circuit comprises: A signal input module, a fan operation module and a valve control module connected in sequence; Wherein, the signal input module is used to respond to the user's water operation on the gas device and obtain the water flow signal of the gas device; The fan operation module is used to determine whether to turn on the fan of the gas equipment according to the water flow signal; when the fan of the gas equipment is turned on, obtain the current operation data of the fan; The valve body control module is used to determine whether to open the gas valve of the gas equipment based on the current operating data; when the gas valve of the gas equipment is opened, the gas valve is subjected to valve body detection, and the opening or closing of the gas valve is controlled according to the valve body detection result.

8. The valve body safety control circuit according to claim 7, characterized in that: The circuit further comprises: a signal filtering module connected to the signal input module and the fan operation module respectively, for filtering the water flow signal output by the signal input module and inputting the filtered water flow signal into the fan operation module.

9. The valve body safety control circuit according to claim 7, characterized in that: The fan operation module includes a fan power supply drive unit, a fan power supply unit and a fan detection unit; The fan power supply drive unit is used to generate a fan drive signal when the water flow signal is normal, wherein the fan drive signal is used to provide speed configuration information and start the fan based on the speed configuration information; The fan power supply unit is used to supply power to the fan; The fan detection unit is used to perform abnormality detection on the current operating data of the fan to obtain a fan detection result; wherein the current operating data includes the fan current, the fan speed and the fan voltage; and the fan detection result includes the fan being normal and the fan being abnormal.

10. The valve body safety control circuit according to claim 9, characterized in that: The valve body control module includes a valve body isolation drive unit, a valve body power supply unit and a valve body detection unit; Wherein, the valve body isolation drive unit is used to generate a valve body drive signal when it is detected that the fan is normal, wherein the valve body drive signal is used to provide the valve body that is expected to be opened and its corresponding opening; The valve body power supply unit is used to supply power to the gas valve; The valve body detection unit is used to perform valve body detection and control the opening or closing of the gas valve according to the valve body detection result.

11. The valve body safety control circuit according to claim 8, characterized in that: The signal filtering module includes a first resistor, a first capacitor, a second resistor and a second capacitor; wherein the input ends of the first resistor and the first capacitor are respectively connected to the output end of the signal input module, and the output end of the first resistor is grounded; the output end of the first capacitor is connected to the input end of the second resistor; the output end of the second resistor is respectively connected to the input end of the fan operation module and the second capacitor; and the output end of the second capacitor is grounded.

12. The valve body safety control circuit according to claim 10, characterized in that: The circuit further comprises: The fan power supply drive unit includes a first transistor, a third resistor and a fourth resistor; wherein one end of the third resistor is connected to the base of the first transistor, and the other end is grounded; one end of the fourth resistor is connected to the collector of the first transistor, and the other end is connected to the fan power supply unit; the emitter of the first transistor is grounded; The fan power supply unit includes a second transistor and a fifth resistor, wherein one end of the fifth resistor is connected to the base of the second transistor, and the other end is connected to the first power supply; the collector of the second transistor is connected to the fan, and the emitter is connected to the first power supply; The fan detection unit includes a first crystal diode, a sixth resistor, a third crystal transistor, a second crystal diode, a seventh resistor, an eighth resistor, a fourth crystal transistor, a ninth resistor and a second power supply; wherein, the first crystal diode, the sixth resistor and the base of the third crystal transistor are connected in sequence to form a first input of a logic AND circuit, the collector of the third crystal transistor is connected in sequence to the ninth resistor and the second power supply, and the emitter of the third crystal transistor is connected to the collector of the fourth crystal transistor; the second crystal diode, the seventh resistor and the base of the fourth crystal transistor are connected in sequence to form a second input of the logic AND circuit, the two ends of the eighth resistor are respectively connected to the base and the emitter of the fourth crystal transistor, and the emitter of the fourth crystal transistor is grounded; the output of the logic AND circuit is connected to a preset low-pass filter unit, and the preset low-pass filter unit includes a tenth resistor and a third capacitor.

13. The valve body safety control circuit according to claim 12, characterized in that: The circuit further comprises: The valve body power supply unit includes a fifth transistor and an eleventh resistor, wherein one end of the eleventh resistor is respectively connected to a preset low-pass filter unit and a base of the fifth transistor, and the other end is connected to an emitter of the fifth transistor, and the emitter of the fifth transistor is connected to a third power supply; the collector of the fifth transistor is connected to the valve body isolation drive unit; The valve body detection unit includes a twelfth resistor, a thirteenth resistor and a fourth capacitor, wherein one end of the twelfth resistor is connected to the gas valve, and the other end is grounded; the thirteenth resistor and the fourth capacitor form a sampling filter circuit, and the sampling filter circuit is respectively connected to the twelfth resistor and the controller of the gas equipment; The valve body isolation driving unit includes a sixth transistor, a fourteenth resistor, a seventh transistor, a fifteenth resistor, a valve body isolation driving capacitor, a sixteenth resistor, a third transistor and a seventeenth resistor; wherein, the emitter of the sixth transistor is connected to the collector of the fifth transistor, the collector is connected to the gas valve, and the base is connected to the fourteenth resistor; the other end of the fourteenth resistor is connected to the collector of the seventh transistor; the emitter of the seventh transistor is grounded, and the base of the seventh transistor is connected to the fifteenth resistor, the valve body isolation driving capacitor, the sixteenth resistor and the controller in sequence; the input end of the third transistor is grounded; the output end is connected to the valve body isolation driving capacitor; the seventeenth resistor is respectively connected to the emitter and base of the seventh transistor.

14. A gas equipment, characterized in that: The gas equipment includes: a fan, a gas valve and a controller, wherein the controller includes a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the valve body safety control method according to any one of claims 1 to 6 by executing the computer instructions.

15. The gas equipment according to claim 14, characterized in that: The gas equipment is a gas water heater.

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