Combustion control method of gas water heater, water heater, electronic equipment and storage medium

Abstract

The invention discloses a combustion control method for a gas water heater, the water heater, electronic equipment and a storage medium, and the combustion control method comprises the steps that when the gas water heater is in a preparation state before ignition, a fan and a gas proportional valve are controlled to be in a starting state; after the fuel gas channel is filled with the hydrogen, the fuel gas proportional valve is controlled to be in a closed state and the fan is controlled to be in an open state; after the combustion chamber and the combustion chamber rear cavity are filled with air, the gas water heater is controlled to be in an ignition state, and when the gas water heater is in the ignition state, the fan is controlled to be kept in a starting state, and the igniter assembly is controlled to be in a starting state to control the ignition needle to generate sparks; the fuel gas proportional valve is controlled to be in an open state so that hydrogen can be mixed with air in the combustion chamber and ignited by the ignition needle; after ignition and opening of the fuel gas proportional valve, hydrogen in the fuel gas channel enters the rear cavity of the combustor assembly and can be combusted after being mixed with air, and the risk of detonation and backfire caused by ignition is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion control of gas water heaters, and in particular to a combustion control method of a gas water heater, a water heater, an electronic device and a storage medium. Background Art

[0002] Hydrogen combustion technology is a clean, efficient and sustainable energy technology, especially natural gas hydrogen combustion technology has been widely used in gas water heaters. Since the explosion limit concentration range of hydrogen is 4.0% to 75% (hydrogen accounts for the total volume ratio of the mixed gas), if the hydrogen volume concentration of the hydrogen-air mixture is within this range, the mixed gas is a flammable and explosive gas. Therefore, when hydrogen combustion technology is applied to gas water heaters, the main combustion method is diffusion combustion. Diffusion combustion is to make the hydrogen input from the air inlet of the burner assembly mix with the air in the rear cavity of the burner assembly before ignition and combustion.

[0003] However, when the gas water heater is not in use, air will infiltrate into the gas channel that transports hydrogen. After the gas proportional valve is opened, hydrogen enters the gas channel and mixes with the air in the gas channel to obtain a flammable and explosive mixture. Once the mixture enters the (ignited) burner assembly, it will produce violent deflagration and explosion, and it will easily backfire into the gas channel connected to the air inlet, and may even backfire into the gas channel near the gas proportional valve, posing a safety hazard to the use of the gas water heater. In addition, the pressure and vibration generated by the combustion of the mixture can easily cause damage to the gas proportional valve. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a combustion control method for a gas water heater, which can avoid the risk of deflagration and backfire caused by ignition and the problem of damage to the gas proportional valve, thereby improving the safety and reliability of using the gas water heater.

[0005] In a first aspect, the present invention provides a combustion control method for a gas water heater, which is applied to a main controller in a gas water heater, wherein the gas water heater further comprises a fan, a combustion chamber, a rear chamber of the combustion chamber and a gas channel, wherein the outlet of the fan is connected to an air inlet of the combustion chamber, the air inlet of the rear chamber of the combustion chamber is connected to an air outlet of the combustion chamber, and the air outlet of the rear chamber of the combustion chamber is connected to the outside; one end of the gas channel is a gas proportional valve, and the other end of the gas channel is a burner of a burner assembly, the burner assembly is arranged in the combustion chamber, the fan and the gas proportional valve are electrically connected to the main controller, and the main controller comprises an igniter assembly, and the igniter assembly is electrically connected to an ignition pin of the burner assembly;

[0006] The gas water heater combustion control method comprises:

[0007] When the gas water heater is in a preparatory state before ignition, the fan and the gas proportional valve are controlled to be in a start-up state, so as to use hydrogen to exhaust the air in the gas channel and fill the gas channel;

[0008] After hydrogen fills the gas passage, the gas proportion valve is controlled to be in a closed state and the blower is kept in an open state, so as to use air to exhaust the mixed gas in the combustion chamber and the rear chamber of the combustion chamber and fill the combustion chamber and the rear chamber of the combustion chamber;

[0009] After the air fills the combustion chamber and the rear cavity of the combustion chamber, the gas water heater is controlled to enter the ignition state. When the gas water heater is in the ignition state, the fan is controlled to remain in the open state and the igniter assembly is in the starting state to control the ignition needle to generate sparks. The gas proportional valve is controlled to be in the open state so that hydrogen is mixed with the air in the combustion chamber and ignited by the ignition needle.

[0010] In a second aspect, the present invention provides a gas water heater, comprising a main controller, a fan, a combustion chamber, a rear chamber of the combustion chamber and a gas channel, wherein the outlet of the fan is connected to the air inlet of the combustion chamber, the air inlet of the rear chamber of the combustion chamber is connected to the air outlet of the combustion chamber, the air outlet of the rear chamber of the combustion chamber is connected to the outside, one end of the gas channel is a gas proportional valve, the other end of the gas channel is a burner of a burner assembly, the burner assembly is arranged in the combustion chamber, the fan and the gas proportional valve are electrically connected to the main controller, the main controller comprises an igniter assembly, and the igniter assembly is electrically connected to an ignition pin of the burner assembly;

[0011] The main controller also includes:

[0012] The gas channel exhaust module is used to control the fan and the gas proportional valve to be in the start-up state when the gas water heater is in the pre-ignition state, so as to exhaust the air in the gas channel with hydrogen and fill the gas channel;

[0013] The burner assembly exhaust module is used to control the gas proportional valve to be in a closed state and the fan to remain in an open state after hydrogen fills the gas passage, so as to use air to exhaust the mixed gas in the combustion chamber and the rear chamber of the combustion chamber and fill the combustion chamber and the rear chamber of the combustion chamber;

[0014] The igniter assembly starting module is used to control the gas water heater to enter the ignition state after the air fills the combustion chamber and the rear chamber of the combustion chamber. When the gas water heater is in the ignition state, the fan is controlled to remain in the on state and the igniter assembly is in the starting state to control the ignition needle to generate sparks;

[0015] The combustion control module is used to control the gas proportional valve to be in an open state so that the hydrogen is mixed with the air in the combustion chamber and ignited by the ignition needle.

[0016] In a third aspect, the present invention provides an electronic device, the electronic device comprising:

[0017] at least one processor; and

[0018] a memory communicatively connected to the at least one processor; wherein,

[0019] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the gas water heater combustion control method described in the first aspect of the present invention.

[0020] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a processor to implement the gas water heater combustion control method described in the first aspect of the present invention when executed.

[0021] The combustion control method of a gas water heater provided in an embodiment of the present invention is applied to a main controller in a gas water heater, wherein the gas water heater further comprises a fan, a combustion chamber, a rear chamber of the combustion chamber and a gas channel, wherein the outlet of the fan is connected to the air inlet of the combustion chamber, the air inlet of the rear chamber of the combustion chamber is connected to the air outlet of the combustion chamber, and the air outlet of the rear chamber of the combustion chamber is connected to the outside; one end of the gas channel is a gas proportional valve, and the other end of the gas channel is a burner of a burner assembly, the burner assembly is arranged in the combustion chamber, the fan and the gas proportional valve are electrically connected to the main controller, and the main controller comprises an igniter assembly, and the igniter assembly is electrically connected to an ignition pin of the burner assembly;

[0022] The gas water heater combustion control method comprises:

[0023] When the gas water heater is in a preparatory state before ignition, the fan and the gas proportional valve are controlled to be in a start-up state, so as to use hydrogen to exhaust the air in the gas channel and fill the gas channel;

[0024] After hydrogen fills the gas passage, the gas proportion valve is controlled to be in a closed state and the blower is kept in an open state, so as to use air to exhaust the mixed gas in the combustion chamber and the rear chamber of the combustion chamber and fill the combustion chamber and the rear chamber of the combustion chamber;

[0025] After the air fills the combustion chamber and the rear chamber of the combustion chamber, the gas water heater is controlled to be in the ignition state. When the gas water heater is in the ignition state, the fan is controlled to remain in the open state, the igniter assembly is in the start state to control the ignition needle to generate sparks, and the gas proportional valve is controlled to be in the open state so that hydrogen is mixed with the air in the combustion chamber and ignited by the ignition needle. Before ignition, hydrogen is used to discharge the air in the gas channel, so that the hydrogen volume concentration of the gas in the gas channel is higher than the upper limit of the hydrogen explosion limit concentration range, and air is used to discharge the remaining mixed gas in the combustion chamber and the rear chamber of the combustion chamber, so that the hydrogen volume concentration of the gas in the rear chamber of the burner assembly is lower than the lower limit of the hydrogen explosion limit concentration range. Before ignition, the gas in the gas channel, the combustion chamber and the rear chamber of the combustion chamber are all non-flammable and non-explosive. After ignition and opening the gas proportional valve, the gas in the gas channel enters the combustion chamber and mixes with the air in the combustion chamber before combustion, which can effectively avoid the risk of deflagration and flashback caused by ignition and the problem of damage to the gas proportional valve, thereby improving the safety and reliability of the use of the gas water heater.

[0026] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural schematic diagram of a combustion control device for a gas water heater provided by an embodiment of the present invention;

[0029] Figure 2 is a flow chart of a gas water heater combustion control method provided by an embodiment of the present invention;

[0030] Figure 3 is a structural schematic diagram of a gas channel provided by an embodiment of the present invention;

[0031] Figure 4 This is a flow chart of a combustion control method for a gas water heater provided by an embodiment of the present invention;

[0032] Figure 5 It is a structural schematic diagram of a main controller in a gas water heater provided by an embodiment of the present invention;

[0033] Figure 6It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0034] Figure numbers: 1. Fan; 2. Main controller; 21. Ignition assembly; 31. Ignition needle; 4. Gas channel; 41. Gas proportional valve; 42. Gas pipeline; 43. Jet pipe; 32. Burner; 5. Water flow sensor; 6. Heat exchanger; 7. Combustion chamber; 8. Rear cavity of combustion chamber; 80. Smoke hood; 81. Smoke pipe; K1. Water inlet; K2. Water outlet; Q1. Air inlet. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 only 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 ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] In one embodiment of the present invention, a method for controlling combustion of a gas water heater is provided. This embodiment is applicable to the case where combustion of a gas water heater is controlled when the gas water heater is started. The method can be executed by a main controller in the gas water heater. The main controller can be implemented in the form of hardware and / or software. The main controller can be configured in an electronic device.

[0037] Figure 1 A schematic diagram of the structure of a gas water heater provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the gas water heater includes: a fan 1, a main controller 2, a burner assembly, a gas channel 4, a combustion chamber 7 and a combustion chamber rear chamber 8. One end of the gas channel 4 is a gas proportional valve 41, and the other end of the gas channel 4 is a burner 32 of the burner assembly. The fan 1 and the gas proportional valve 41 are electrically connected to the main controller 2, that is, the main controller 2 can control the operation of the fan 1 and the gas proportional valve 41, specifically including controlling the start and stop of the fan 1 and the gas proportional valve 41, the speed of the fan 1 and the opening flow of the gas proportional valve 41; the main controller 2 includes an igniter assembly 21, and the burner assembly includes an ignition needle 31, and the ignition needle 31 is electrically connected to the igniter assembly 21, that is, the igniter assembly 21 can control the start and stop of the ignition needle.

[0038] Figure 2 A flow chart of a gas water heater combustion control method provided by an embodiment of the present invention, the gas water heater combustion control is applied to the main controller, such as Figure 1 As shown, the gas water heater combustion control method includes:

[0039] S201. When the gas water heater is in a preparatory state before ignition, the fan and the gas proportional valve are controlled to be in a start-up state so as to use hydrogen to exhaust the air in the gas channel and fill the gas channel.

[0040] The preparatory state before ignition can be automatically triggered internally or by an external command.

[0041] In an optional example, an external device may send a pre-start instruction to a main controller of the gas water heater, and upon receiving the instruction, the main controller controls the gas water heater to be in a pre-ignition standby state.

[0042] In another alternative embodiment, Figure 1 As shown, the gas water heater further includes a water flow sensor 5 electrically connected to the main controller 2 , and the water flow signal collected by the water flow sensor 5 is sent to the main controller 2 .

[0043] The gas water heater combustion control method further includes: before the gas water heater is in a pre-ignition pre-state, determining the water flow rate according to a signal sent by a water flow sensor; judging whether the water flow rate is greater than a preset water heater start-up flow rate; if so, determining that the gas water heater is in a pre-ignition pre-state; if not, determining that the gas water heater is in a standby state. That is, when the gas water heater detects that the water flow rate is greater than the preset water heater start-up flow rate, the pre-ignition pre-state is automatically triggered.

[0044] like Figure 1 As shown, the gas water heater is provided with a heat exchanger 6, a water inlet K1 and a water outlet K2. The two ends of the heat exchanger 6 are connected to the water inlet K1 and the water outlet K2 respectively. The burner assembly heats the water in the heat exchanger 6 by burning hydrogen. The water flow sensor 5 is located at the water inlet K1 of the gas water heater to detect the water inlet flow of the gas water heater. The water flow sensor 5 is electrically connected to the main controller 2, and the water flow signal collected by the water flow sensor 5 is sent to the main controller 2. The heating power of the burner assembly is large and the heating speed is fast. In order to avoid dry burning of the heat exchanger 6, before the gas water heater enters the pre-ignition pre-state, this example pre-sets the water heater start-up flow as the "threshold" flow for starting the gas water heater. When the water inlet flow is less than or equal to the preset water heater start-up flow, the gas water heater is in a standby state; when the water inlet flow is greater than the preset water heater start-up flow, the gas water heater is in a pre-ignition pre-state.

[0045] like Figure 1 As shown, the gas proportional valve 41 is located at the air inlet Q1 in the gas water heater to adjust the intake flow rate of hydrogen in the gas channel 4. The fan 1 blows the outside air into the combustion chamber 7 by rotating to provide the required oxygen for the combustion process of the gas (mixed gas) to ensure that the gas can be fully burned. The fan 1 can also purge the gas in the combustion chamber 7.

[0046] When the gas water heater is in preparation before ignition, the fan 1 and the gas proportional valve 41 are controlled to be in the starting state. At this time, the hydrogen from the air inlet Q1 enters the gas channel 4, and the gas in the gas channel 4 is discharged into the combustion chamber 7, so that the air in the gas channel 4 is discharged with hydrogen and the gas channel 4 is filled. At the same time, when the fan 1 is in the starting state, the outside air is blown into the combustion chamber 7, so that the gas in the combustion chamber 7 and the combustion chamber rear cavity 8 is discharged outward.

[0047] It can be understood that, in the present embodiment, the gas water heater further includes a smoke hood 80 and a smoke duct 81, the smoke duct 81 is connected to the air outlet of the smoke hood 80, the air inlet of the smoke hood 80 is connected to the smoke outlet of the heat exchanger 6, the smoke inlet of the heat exchanger 6 is connected to the smoke outlet of the combustion chamber 7, the combustion chamber rear cavity 8 can be understood as a cavity space connected to the smoke outlet of the combustion chamber 7, and therefore the combustion chamber rear cavity 8 includes the cavity space of the heat exchanger 6, the cavity space of the smoke hood 80 and the cavity space of the smoke duct 81. During the combustion operation of the gas water heater, after the smoke flows out of the combustion chamber 7, it flows through the cavity space of the heat exchanger 6, the cavity space of the smoke hood 80 and the cavity space of the smoke duct 81 in sequence, and is finally discharged from the outlet of the smoke duct 81.

[0048] In other embodiments, the cavity space composition of the combustion chamber rear chamber 8 can also be adjusted according to the cavity space corresponding to the actual parts of the machine through which the flue gas flows, or the cavity space composition of the combustion chamber rear chamber 8 is based on the cavity space corresponding to the machine where deflagration is prone to occur when the machine is ignited, and the mixed gas in this cavity space needs to be cleaned out. The cavity space composition of the combustion chamber rear chamber 8 will not be elaborated one by one here.

[0049] The purpose of this step is to use hydrogen to exhaust the air in the gas channel 4 and fill the gas channel 4. The gas channel 4 has a certain volume, so it takes a certain amount of time to exhaust the gas channel 4 and fill it with hydrogen.

[0050] In an optional embodiment, a sufficient first preset time can be set to ensure that hydrogen is discharged from the air in the gas channel 4 and fills the gas channel 4, and the first preset time can be set based on the volume of the gas channel 4 and the opening flow of the gas proportional valve 41; when the gas water heater is in the pre-start state, the time for controlling the fan 1 and the gas proportional valve 41 to be in the start state is the first preset time, and the first preset time is negatively correlated with the opening flow of the gas proportional valve 41 and positively correlated with the volume of the gas channel 4. That is, the larger the volume of the gas channel 4 and the smaller the opening flow of the gas proportional valve 41, the longer the first preset time required, and the smaller the volume of the gas channel 4 and the larger the opening flow of the gas proportional valve 41, the shorter the first preset time required.

[0051] Specifically, the calculation formula for the first preset duration is:

[0052] t1=V p (C max +ΔC) / F

[0053] Among them, t1 is the first preset time length, V p is the volume of the gas channel 4, C max is the upper limit of the hydrogen explosion limit concentration range, ΔC is the redundant hydrogen concentration, and F is the opening flow of the gas proportional valve 41. max +ΔC is certainly greater than C max After the gas proportional valve 41 is opened for the first preset time at the current opening flow F, the hydrogen concentration in the gas channel 4 can certainly be made greater than the upper limit of the hydrogen explosion limit concentration range. max Taking 75% as an example, the value range of ΔC can be set to 5%-25%, and the specific value can be taken according to actual needs. When ΔC is 25%, after the gas proportional valve 41 is opened for the first preset time at the current opening flow F, the concentration of hydrogen in the gas channel 4 will be 100%, that is, the gas in the gas channel 4 is pure hydrogen, which is not a flammable or explosive gas. When ΔC is less than 25%, after the gas proportional valve 41 is opened for the first preset time at the current opening flow F, the gas in channel 4 is a mixed gas but the hydrogen concentration is greater than the upper limit of the hydrogen explosion limit concentration range, which is a non-flammable gas. When ΔC is less than 25%, the hydrogen concentration in channel 4 can be controlled to meet the requirements while saving the amount of hydrogen used. When the gas in channel 4 is mainly hydrogen and the hydrogen purity is high, it is a non-flammable gas, which can avoid the situation of flashback to the gas channel 4 during ignition.

[0054] In another optional embodiment, a gas sensor is provided at the outlet of the burner 32, and the gas sensor is electrically connected to the main controller 2. The gas sensor is used to detect the concentration of hydrogen discharged from the gas channel 4. When the concentration is greater than the upper limit value of the hydrogen explosion limit concentration range or the concentration is 100%, the main controller 2 determines that the hydrogen has been discharged from the air in the gas channel 4 and fills the gas channel 4.

[0055] S202, after hydrogen fills the fuel gas passage, the fuel gas proportional valve 41 is controlled to be in a closed state and the fan 1 is kept in an open state, so as to use air to exhaust the mixed gas in the combustion chamber 7 and the combustion chamber rear chamber 8 and fill the combustion chamber 7 and the combustion chamber rear chamber 8.

[0056] After hydrogen fills the gas channel, the hydrogen concentration of the gas in the gas channel 4 can be made greater than the upper limit of the hydrogen explosion limit concentration range, that is, it is non-flammable and explosive. Therefore, the gas proportioning valve 41 can be controlled to be in a closed state. However, at this time, the gas in the combustion chamber 7 and the combustion chamber rear chamber 8 may still have some flammable and explosive mixed gases remaining. Therefore, the fan 1 is still required to purge the mixed gases in the combustion chamber 7 and the combustion chamber rear chamber 8, that is, the fan 1 is controlled to remain in an open state to use air to exhaust the mixed gases in the combustion chamber 7 and the combustion chamber rear chamber 8 and fill the combustion chamber 7 and the combustion chamber rear chamber 8.

[0057] In an optional embodiment, after hydrogen fills the gas channel 4, the gas proportional valve 41 is controlled to be in a closed state and the duration for which the fan 1 remains in an open state is a second preset duration. A sufficient second preset duration can be set to ensure that air is discharged from the combustion chamber 7 and the combustion chamber rear chamber 8 and fills the combustion chamber 7 and the combustion chamber rear chamber 8. The second preset duration can be set based on the cavity volume size of the combustion chamber 7 and the combustion chamber rear chamber 8 and the speed of the fan; the second preset duration is negatively correlated with the speed of the fan 1 and positively correlated with the volume of the combustion chamber 7 and the combustion chamber rear chamber 8. The speed of the fan 1 is positively correlated with the air intake flow rate. The greater the speed of the fan 1 and the smaller the volume of the combustion chamber 7 and the combustion chamber rear chamber 8, the smaller the required second preset duration, and the smaller the speed of the fan and the larger the volume of the combustion chamber 7 and the combustion chamber rear chamber 8, the larger the required second preset duration.

[0058] After using air to exhaust the mixed gas in the combustion chamber 7 and the combustion chamber rear chamber 8 and fill the combustion chamber 7 and the combustion chamber rear chamber 8, the hydrogen concentration of the gas in the combustion chamber 7 and the combustion chamber rear chamber 8 can be made less than the lower limit of the hydrogen explosion limit concentration range or the concentration is 0%, that is, the gas in the combustion chamber 7 and the combustion chamber rear chamber 8 is mainly air with a high air purity and is a non-flammable and explosive gas.

[0059] It should be noted that in this step, the fan remains on and continues to blow air into the combustion chamber 7. The pressure in the combustion chamber 7 is greater than the pressure inside the water heater. In order to avoid too much air being pressed into the burner 32, the internal pressure of the combustion chamber 7 needs to be maintained equal to or less than and close to the internal pressure of the gas channel 4. Therefore, the speed of the fan can be set according to the internal pressure requirements of the combustion chamber 7, which will not be elaborated here.

[0060] In another optional embodiment, a gas sensor is provided at the combustion chamber 7 and the combustion chamber rear chamber 8, and the gas sensor is electrically connected to the main controller 2. The gas sensor is used to detect the concentration of hydrogen discharged from the combustion chamber 7 and the combustion chamber rear chamber 8. When the concentration is less than the lower limit of the hydrogen explosion limit concentration range or the concentration is 0%, the main controller 2 determines that air has been discharged from the mixture in the combustion chamber 7 and the combustion chamber rear chamber 8 and fills the combustion chamber 7 and the combustion chamber rear chamber 8.

[0061] It should be noted that the position and number of gas sensors can be set according to the gas flow rate, the size of the space between the combustion chamber 7 and the combustion chamber rear cavity 8, and the length of the flue gas flow duct. For example, when the length of the flue gas flow duct formed by the combustion chamber 7 and the combustion chamber rear cavity 8 is relatively long, in order to ensure the accuracy of detection, multiple gas sensors can be arranged at intervals along the flue gas flow direction.

[0062] S203, after the air fills the combustion chamber 7 and the combustion chamber rear chamber 8, the fan 1 is controlled to be in an on state and the igniter assembly 21 is in a start state, so as to control the ignition needle 31 to generate sparks.

[0063] After the air fills the combustion chamber 7 and the combustion chamber rear chamber 8, the gas in the combustion chamber 7 and the combustion chamber rear chamber 8 is high-purity air, and the gas in the combustion channel 4 is high-purity hydrogen, which are not flammable and explosive gases, and are not prone to deflagration and backfire during ignition. The gas water heater can be turned on for ignition, and the igniter assembly 21 is controlled to be in the start state to control the ignition needle 8 to generate sparks. The fan 1 is in the on state, so that oxygen can be supplied for the ignition and combustion process.

[0064] To ensure successful ignition, after controlling the igniter assembly 21 to be in the starting state, the flame signal of the ignition needle 8 can also be detected. When the flame signal is detected, S204 is executed. When the flame signal is not detected, the gas proportional valve 41 is closed, and the fan is controlled to purge the mixture in the combustion chamber 7 and the rear chamber 8 of the combustion chamber, so that air is used to exhaust the mixture in the combustion chamber 7 and the rear chamber 8 of the combustion chamber and fill the combustion chamber 7 and the rear chamber 8 of the combustion chamber (at this time, the combustion channel 4 is still high in hydrogen concentration, so there is no need to exhaust the combustion channel 4), and then repeat this step S203.

[0065] S204, control the fuel gas proportional valve to be in an open state, so that the hydrogen is mixed with the air in the combustion chamber 7 and ignited by the ignition needle.

[0066] After the ignition needle 8 generates a spark, the gas proportioning valve 41 is controlled to be in an open state, and the gas in the combustion channel 4 is transported to the rear cavity of the burner assembly and mixed with the air in the combustion chamber 7 to obtain a mixed gas. When the hydrogen concentration of the mixed gas is within the hydrogen explosion limit concentration range, it will burn when encountering the high-temperature spark generated by the ignition needle 8. On the one hand, at this time, the gas in the gas channel 4 is a high-concentration (greater than 75%) hydrogen or pure hydrogen, which is a non-flammable gas, so it can avoid the situation where backfires into the gas channel 4, and avoid the pressure and vibration caused by the backfire from damaging the gas proportioning valve 41. On the other hand, the hydrogen in the gas channel 4 will burn only after mixing with the air in the combustion chamber 7 to a certain concentration, so that the hydrogen explosion phenomenon in the ignition stage is relatively mild, which can ensure the safety and reliability of ignition.

[0067] In an optional embodiment of the present invention, Figure 1As shown, the fan 1 is an upper fan, which draws air through the top air inlet of the burner assembly, reduces the blockage and resistance of the bottom air inlet, improves the air intake effect and thus improves the combustion efficiency.

[0068] In an optional embodiment, the structure of the gas channel 4 is as follows: Figure 3 As shown, the gas channel 4 includes a gas proportional valve 41, a gas pipeline 42, an injection pipe 43 and a burner 32 which are connected in sequence.

[0069] In an optional embodiment, when the gas water heater is in the preparatory state before ignition and after hydrogen fills the gas channel, the speed of the fan 1 when it is in the startup state is a preset purge speed. In the above two stages of the preparatory state before ignition and hydrogen filling the gas channel, the function of the fan 1 is to purge the gas, so the speed of the fan 1 is set to a fixed purge speed, and the specific purge speed can be set according to actual needs.

[0070] In an optional embodiment, after the air fills the combustion chamber 7 and the combustion chamber rear chamber 8, the speed of the fan in the startup state is the ignition speed. After the air fills the combustion chamber 7 and the combustion chamber rear chamber 8 and the gas proportional valve is opened, the gas water heater is ready to enter the ignition combustion state. At this time, the function of the fan 1 is to supply oxygen for combustion. Therefore, the speed of the fan 1 in the startup state is the ignition speed. Specifically, a fixed ignition speed can be set according to actual needs. The ignition speed is positively correlated with the opening flow of the gas proportional valve 41; the larger the opening flow of the gas proportional valve 41, the more oxygen is required for combustion and the more mixed air is required. Therefore, a larger speed needs to be set, and vice versa, the speed of the fan 1 is smaller.

[0071] In addition, the speed of fan 1 can also be adjusted according to the water flow rate of water inlet K1 and the set water temperature. The greater the water flow rate and the higher the required water temperature, the greater the heating power is needed. The greater the amount of oxygen required for combustion, the greater the speed of fan 1. Conversely, the speed of fan 1 is smaller.

[0072] In order to clearly illustrate the combustion control method of the gas water heater in the present invention, the following examples and Figure 4 To explain, Figure 4 The present invention is a flow chart of a combustion control method for a gas water heater, and the combustion control method for a gas water heater includes:

[0073] S401, standby.

[0074] That is, the main controller is in standby mode.

[0075] S402, judging whether the water flow rate is greater than or equal to Q through a water flow sensor;

[0076] Q is the preset water heater startup flow rate. When the water flow rate is greater than or equal to Q, S403 is executed, and when the water flow rate is less than Q, the process returns to S401.

[0077] S403, fan starts.

[0078] Specifically, it starts at the purge speed.

[0079] S404, gas proportional valve starts.

[0080] The startup duration is t1 (a first preset duration), the air in the gas channel is exhausted, and S405 is executed when t1 is reached.

[0081] S405, the gas proportional valve is closed.

[0082] At this time, the fan is still running at the purge speed to purge the mixed gas in the combustion chamber 7 and the combustion chamber rear chamber 8. After the fan continues to run for t2 (the second preset time), the fan speed r is set, r is the ignition speed, and then S406 is executed;

[0083] S406, gas proportional valve starts.

[0084] S407, the ignition assembly is started.

[0085] S408: Determine whether a flame signal is detected.

[0086] If yes, execute S409, if no, execute S410.

[0087] S409: Normal operation.

[0088] S410, gas proportional valve is closed.

[0089] S411, fan starts.

[0090] The fan is started to purge the mixed gas in the combustion chamber 7 and the rear chamber 8 of the combustion chamber. After the fan is started at the purge speed for a period of time t2, the fan speed is set to r, and then the process returns to step S406.

[0091] The combustion control method for a gas water heater provided in an embodiment of the present invention is as follows: when the water heater is in a preparatory state before ignition, the fan 1 and the gas proportional valve 41 are controlled to be in a starting state, so as to use hydrogen to exhaust the air in the gas channel 4 and fill the gas channel 4; after the hydrogen fills the gas channel 4, the gas proportional valve 41 is controlled to be in a closed state and the fan 1 is kept in an open state, so as to use air to exhaust the mixed gas in the combustion chamber 7 and the combustion chamber rear cavity 8 and fill the combustion chamber 7 and the combustion chamber rear cavity 8; after the air fills the combustion chamber 7 and the combustion chamber rear cavity 8, the fan 1 is controlled to be in an open state and the igniter assembly 21 is in a starting state, so as to control the ignition needle 31 to generate sparks; the gas proportional valve 41 is controlled to be in an open state, so that the hydrogen is mixed with the air in the combustion chamber 7 and the combustion chamber rear cavity 8 and ignited by the ignition needle. Before ignition, hydrogen is used to discharge the air in the gas channel, so that the hydrogen volume concentration of the gas in the gas channel can be higher than the upper limit of the hydrogen explosion limit concentration range, and air is used to discharge the remaining mixed gas in the combustion chamber 7 and the combustion chamber rear chamber 8, so that the hydrogen volume concentration of the gas in the combustion chamber 7 and the combustion chamber rear chamber 8 can be lower than the lower limit of the hydrogen explosion limit concentration range. Then, before ignition, the gas in the gas channel 4 and the gas in the combustion chamber 7 and the combustion chamber rear chamber 8 are all non-flammable and non-explosive. After ignition and opening the gas proportional valve 41, the gas in the gas channel 4 enters the combustion chamber 7 and is mixed with the air in the combustion chamber 7 before it can burn, which can effectively avoid the risk of deflagration and backfire caused by ignition and the problem of damage to the gas proportional valve, thereby improving the safety and reliability of using the gas water heater.

[0092] Corresponding to the combustion control method of the gas water heater of the present invention, in one embodiment of the present invention, a gas water heater is further provided. Figure 1 The structure diagram of a gas water heater provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the gas water heater includes: a main controller 2, a fan 1, a burner assembly and a gas channel 4, one end of the gas channel 4 is a gas proportional valve 41, the other end of the gas channel 4 is a burner 32 of the burner assembly, the burner assembly is arranged in the combustion chamber 7, the fan 1 and the gas proportional valve 41 are electrically connected to the main controller 2, the main controller 2 includes an igniter assembly 21, and the igniter assembly 21 is electrically connected to the ignition needle 31 of the burner assembly;

[0093] Figure 5 A schematic diagram of the structure of a main controller in a gas water heater provided in an embodiment of the present invention. The main controller also includes:

[0094] The gas channel exhaust module 501 is used to control the fan and the gas proportional valve to be in the start-up state when the gas water heater is in the pre-ignition state, so as to exhaust the air in the gas channel with hydrogen and fill the gas channel;

[0095] The burner assembly exhaust module 502 is used to control the gas proportional valve 41 to be in a closed state and the fan 1 to remain in an open state after hydrogen fills the gas channel, so as to use air to exhaust the mixed gas in the combustion chamber 7 and the combustion chamber rear cavity 8 and fill the combustion chamber 7 and the combustion chamber rear cavity 8;

[0096] The igniter assembly starting module 503 is used to control the gas water heater to be in an ignition state after the air fills the rear cavity of the burner assembly. When the gas water heater is in the ignition state, the fan 1 is controlled to remain in an on state and the igniter assembly 21 is in a starting state to control the ignition needle 31 to generate sparks;

[0097] The combustion control module 504 is used to control the gas proportional valve 41 to be in an open state so that the hydrogen is mixed with the air in the combustion chamber and ignited by the ignition needle 31 .

[0098] Optionally, the gas water heater further includes a water flow sensor 5 electrically connected to the main controller 2, and the main controller further includes:

[0099] A water flow determination module, used to determine the water flow according to the signal sent by the water flow sensor 5;

[0100] A water flow determination module is used to determine whether the water flow is greater than a preset water heater start-up flow; if so, the contents of the pre-start module are executed; if not, the contents of the standby module are executed;

[0101] A pre-start module is used to determine whether the gas water heater is in a pre-ignition state;

[0102] The standby module is used to determine whether the gas water heater is in standby state.

[0103] Optionally, when the gas water heater is in a pre-ignition state, the duration for controlling the fan 1 and the gas proportional valve 41 to be in the start-up state is a first preset duration, and the first preset duration is negatively correlated with the opening flow of the gas proportional valve 41 and positively correlated with the volume of the gas channel 4.

[0104] Optionally, the calculation formula for the first preset duration is:

[0105] t1=V p (C max +ΔC) / F

[0106] Among them, t1 is the first preset time length, V p is the volume of the gas channel, C max is the upper limit of the hydrogen explosion limit concentration range, ΔC is the redundant hydrogen concentration, and F is the opening flow of the gas proportional valve.

[0107] Optionally, after hydrogen fills the gas channel, the gas proportional valve is controlled to be in a closed state and the fan is kept in an open state for a second preset time period, and the second preset time period is negatively correlated with the fan speed and positively correlated with the volume of the combustion chamber 7 and the combustion chamber rear chamber 8.

[0108] Optionally, when the gas water heater is in a preparatory state before ignition and after hydrogen fills the gas channel, the speed of the fan when it is in a starting state is a preset purge speed.

[0109] Optionally, after the air fills the combustion chamber 7 and the combustion chamber rear cavity 8, the rotation speed of the fan when it is in the starting state is the ignition rotation speed, and the ignition rotation speed is positively correlated with the opening flow of the gas proportional valve.

[0110] The gas water heater combustion control device provided in the embodiment of the present invention can execute the gas water heater combustion control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0111] Figure 6 A block diagram of an electronic device 60 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as servers and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0112] like Figure 6 As shown, the electronic device 60 includes at least one processor 61, and a memory connected to the at least one processor 61, such as a read-only memory (ROM) 62, a random access memory (RAM) 63, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 61 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 62 or the computer program loaded from the storage unit 68 to the random access memory (RAM) 63. In the RAM 63, various programs and data required for the operation of the electronic device 60 can also be stored. The processor 61, the ROM 62, and the RAM 63 are connected to each other via a bus 64. An input / output (I / O) interface 65 is also connected to the bus 64.

[0113] A number of components in the electronic device 60 are connected to the I / O interface 65, including: an input unit 66, such as a keyboard, a mouse, etc.; an output unit 67, such as various types of displays, speakers, etc.; a storage unit 68, such as a disk, an optical disk, etc.; and a communication unit 69, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 69 allows the electronic device 60 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0114] The processor 61 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 61 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 61 executes the various methods and processes described above, such as a gas water heater combustion control method.

[0115] In some embodiments, the gas water heater combustion control method can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 68. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 60 via the ROM 62 and / or the communication unit 69. When the computer program is loaded into the RAM 63 and executed by the processor 61, one or more steps of the gas water heater combustion control method described above can be performed. Alternatively, in other embodiments, the processor 61 can be configured to execute the gas water heater combustion control method in any other appropriate manner (for example, by means of firmware).

[0116] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0117] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0118] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in combination with an instruction execution system, device or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0119] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0120] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0121] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0122] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0123] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A combustion control method for a gas water heater, characterized in that: A main controller applied to a gas water heater, the gas water heater also includes a fan, a combustion chamber, a rear chamber of the combustion chamber and a gas channel, the outlet of the fan is connected to the air inlet of the combustion chamber, the air inlet of the rear chamber of the combustion chamber is connected to the air outlet of the combustion chamber, and the air outlet of the rear chamber of the combustion chamber is connected to the outside; one end of the gas channel is a gas proportional valve, the other end of the gas channel is a burner of a burner assembly, the burner assembly is arranged in the combustion chamber, the fan and the gas proportional valve are electrically connected to the main controller, the main controller includes an igniter assembly, and the igniter assembly is electrically connected to the ignition pin of the burner assembly; The gas water heater combustion control method comprises: When the gas water heater is in a preparatory state before ignition, the fan and the gas proportional valve are controlled to be in a start-up state, so as to use hydrogen to exhaust the air in the gas channel and fill the gas channel; After hydrogen fills the gas passage, the gas proportion valve is controlled to be in a closed state and the blower is kept in an open state, so as to use air to exhaust the mixed gas in the combustion chamber and the rear chamber of the combustion chamber and fill the combustion chamber and the rear chamber of the combustion chamber; After the air fills the combustion chamber and the rear cavity of the combustion chamber, the gas water heater is controlled to enter the ignition state. When the gas water heater is in the ignition state, the fan is controlled to remain in the open state and the igniter assembly is in the starting state to control the ignition needle to generate sparks. The gas proportional valve is controlled to be in the open state so that hydrogen is mixed with the air in the combustion chamber and ignited by the ignition needle.

2. The method according to claim 1, characterized in that The gas water heater further includes a water flow sensor electrically connected to the main controller, and the method further includes: Before the gas water heater enters the pre-ignition preparation state, it includes: determining the water flow rate according to a signal sent by the water flow sensor; Determining whether the water flow rate is greater than a preset water heater startup flow rate; If so, make sure the gas water heater has entered the pre-ignition state; If not, make sure the gas water heater is in standby mode.

3. The method according to claim 1, characterized in that When the gas water heater is in a pre-ignition state, the blower and the gas proportional valve are controlled to be in the start-up state for a first preset time period to allow hydrogen to fill the gas channel, or the blower and the gas proportional valve are controlled to be in the start-up state until the hydrogen concentration at the burner outlet is greater than the upper limit value of the hydrogen explosion limit concentration range to allow hydrogen to fill the gas channel.

4. The method according to claim 3, characterized in that The first preset time is negatively correlated with the opening flow of the gas proportional valve and positively correlated with the volume of the gas channel; the calculation formula of the first preset time is: t1=V p (C max +ΔC) / F Among them, t1 is the first preset time length, V p is the volume of the gas channel, C max is the upper limit of the hydrogen explosion limit concentration range, ΔC is the redundant hydrogen concentration, and F is the opening flow of the gas proportional valve.

5. The method according to claim 1, characterized in that After hydrogen fills the gas channel, the gas proportional valve is controlled to be in a closed state and the fan is kept in an open state for a second preset time period to allow air to fill the combustion chamber and the rear chamber of the combustion chamber. The second preset time period is negatively correlated with the fan speed and positively correlated with the volume of the combustion chamber and the rear chamber of the combustion chamber. Alternatively, the gas proportional valve is controlled to be in a closed state and the fan is kept in an open state until the hydrogen concentration in the combustion chamber and the rear chamber of the combustion chamber is less than the lower limit of the hydrogen explosion limit concentration range to allow air to fill the combustion chamber and the rear chamber of the combustion chamber.

6. The method according to any one of claims 1 to 5, characterized in that: When the gas water heater is in the pre-start state and after hydrogen fills the gas channel, the speed of the fan in the start-up state is the preset purge speed.

7. The method according to any one of claims 1 to 5, characterized in that: When the gas water heater is in an ignition state, the rotation speed of the fan when it is kept in an on state is the ignition rotation speed, and the ignition rotation speed is positively correlated with the opening flow of the gas proportional valve.

8. A gas water heater, characterized in that: It includes a main controller, a fan, a combustion chamber, a rear chamber of the combustion chamber and a gas channel, the fan is connected to the air inlet of the combustion chamber, the air inlet of the rear chamber of the combustion chamber is connected to the air outlet of the combustion chamber, the air outlet of the rear chamber of the combustion chamber is connected to the outside, one end of the gas channel is a gas proportional valve, the other end of the gas channel is a burner of the burner assembly, the burner assembly is arranged in the combustion chamber, the fan and the gas proportional valve are electrically connected to the main controller, the main controller includes an igniter assembly, and the igniter assembly is electrically connected to the ignition needle of the burner assembly; The main controller also includes: The gas channel exhaust module is used to control the fan and the gas proportional valve to be in the start-up state when the gas water heater is in the pre-ignition state, so as to exhaust the air in the gas channel with hydrogen and fill the gas channel; The burner assembly exhaust module is used to control the gas proportional valve to be in a closed state and the fan to remain in an open state after hydrogen fills the gas passage, so as to use air to exhaust the mixed gas in the combustion chamber and the rear chamber of the combustion chamber and fill the combustion chamber and the rear chamber of the combustion chamber; The igniter assembly starting module is used to control the gas water heater to enter the ignition state after the air fills the combustion chamber and the rear chamber of the combustion chamber. When the gas water heater is in the ignition state, the fan is controlled to remain in the on state and the igniter assembly is in the starting state to control the ignition needle to generate sparks; The combustion control module is used to control the gas proportional valve to be in an open state so that the hydrogen is mixed with the air in the combustion chamber and ignited by the ignition needle.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the gas water heater combustion control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the gas water heater combustion control method according to any one of claims 1 to 7 when executed.

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