Combustion control method and device and gas water heating equipment

Abstract

The invention relates to the technical field of gas-fired water heating equipment, and discloses a combustion control method and device and gas-fired water heating equipment.The combustion control method comprises the steps that in response to the fact that the gas-fired water heating equipment is in a pulse combustion mode, a combustor of the gas-fired water heating equipment is controlled to flame out, and statistics of the second duration when the combustor is in the flame-out state is triggered; if the actual water outlet temperature is smaller than the target water outlet temperature, the combustor is controlled to conduct ignition combustion according to the first duration, and the second duration is obtained; and the first duration and / or the second duration are / is corrected based on the actual water outlet temperature, and the combustor is controlled to operate according to the corrected first duration and / or the second duration. According to the invention, additional parts are not needed, and the actual water outlet temperature is stabilized near the preset water outlet temperature by adjusting the duration of the gas water heating equipment in different working states, so that the requirement of a user on the bathroom water temperature is met.

Description

Technical Field

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

[0002] In summer, when the inlet water temperature of the gas water heater is high or the inlet water flow rate is small, and the temperature rise required when used in bathroom mode is small, it is easy to exceed the adjustable range of the gas water heater, resulting in the problem of too hot outlet water temperature. If you want to adjust the temperature of the bathroom water to a suitable temperature, you can reduce the power of the gas heating water heater by reducing the gas supply of the burner. However, the normal combustion of the burner cannot reduce the gas supply indefinitely to reduce the power of the gas heating water heater, otherwise flashback will occur. The related technology uses a method of reducing the heat load by staged combustion of the burner, but staged combustion has the risk of slow flame transfer and flame transfer failure, and there is still the problem of too hot outlet water temperature. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a combustion control method, device and gas water heater, which effectively solve the technical problem of excessively hot water outlet temperature in bathroom mode.

[0004] The above technical problems are solved by the following technical solutions:

[0005] In a first aspect, the present invention provides a combustion control method, the method comprising:

[0006] In response to the gas water heater being in bathroom mode, obtaining an actual outlet water temperature and a target outlet water temperature of the gas water heater;

[0007] If the actual outlet water temperature is greater than the target outlet water temperature, the gas water heater is controlled to enter a pulse combustion mode;

[0008] In response to the gas water heater being in the pulse combustion mode, the burner of the gas water heater is controlled to be extinguished and the statistics of the second duration of the burner being in the extinguished state are triggered; if the actual outlet water temperature is lower than the target outlet water temperature, the burner is controlled to ignite and burn for the first duration and obtain the second duration; wherein the first duration is obtained based on the equipment parameters of the gas water heater and the inlet and outlet water temperature difference of the bathroom water;

[0009] Based on the actual outlet water temperature, the first duration and the second duration are corrected, and the burner is controlled to operate with the corrected first duration and the second duration.

[0010] Compared with the background technology, the combustion control method described in the present invention has the following beneficial effects: when the gas water heater is in the bathroom mode, that is, when the user is using hot water, by comparing the actual water outlet temperature and the target water outlet temperature, if the actual water outlet temperature is lower than the target water outlet temperature, the burner of the gas water heater is controlled to ignite, so as to heat the bathroom water and increase the temperature of the bathroom water; when the actual water outlet temperature is higher than the target water outlet temperature, the temperature of the bathroom water meets the user's needs, and at this time, the gas water heater is controlled to enter the pulse combustion mode, the burner of the gas water heater is controlled to be extinguished, and the second duration of the burner of the gas water heater is in the extinguished state is counted, the burner of the gas water heater is controlled to be extinguished after burning for the first duration, and the burner is ignited after being in the extinguished state for the second duration. ignite, and continue to burn for a first duration, and repeat this cycle; then, based on the comparison between the actual water outlet temperature and the target water outlet temperature, when the heating effect of the gas water heater does not meet expectations, the first duration and the second duration are corrected, and the gas water heater is controlled to operate with the corrected first duration and the second duration, the burner is extinguished after burning for the first duration, and the waste heat of the heat exchanger is used to continue heating so that the temperature of the bathroom water meets the user's needs, avoiding the heat exchanger from continuously absorbing heat and causing the bathroom water outlet temperature to be too hot; the burner is ignited after the burner is extinguished for a second duration to heat the bathroom water and increase the temperature of the bathroom water outlet, so that the bathroom water temperature provided by the gas water heater is more stable and meets the user's needs, avoiding discomfort to the user due to excessively high or low bathroom water temperature. The present invention can maintain the actual outlet water temperature of the bathroom at a preset outlet water temperature by adjusting the burner of the gas water heater to maintain a flameout-ignition-extinguishing cycle working state for a first duration and a second duration without adding additional components such as a burner sectional valve and a water mixing valve, and continuously correcting the first duration and the second duration according to the actual outlet water temperature of the bathroom, thereby stabilizing the actual outlet water temperature of the bathroom at around a preset outlet water temperature and meeting the user's demand for bathroom water temperature; and solves the problem of excessively hot outlet water temperature of the bathroom caused by high inlet water temperature in summer exceeding the temperature control range of the gas water heater.

[0011] In one embodiment, the method further includes: the target outlet water temperature includes a first target outlet water temperature and a second target outlet water temperature; wherein the first target outlet water temperature is less than the second target outlet water temperature;

[0012] In response to the gas water heater being in the bathroom mode, if the actual outlet water temperature is greater than the second target outlet water temperature, controlling the gas water heater to enter the pulse combustion mode;

[0013] In response to the gas water heater being in the pulse combustion mode, if the actual outlet water temperature is less than or equal to the first target outlet water temperature, the burner of the gas water heater is controlled to ignite and burn for a first duration.

[0014] In one embodiment, the method further comprises:

[0015] Obtaining the actual water outlet temperature, the preset water outlet temperature, the first preset temperature and the second preset temperature of the gas water heater in the bathroom mode;

[0016] The first target water outlet temperature and the second target water outlet temperature are calculated based on the preset water outlet temperature, the first preset temperature and the second preset temperature.

[0017] In one embodiment, the first duration and the second duration are corrected based on the actual outlet water temperature, including:

[0018] Acquire a third preset temperature; the third preset temperature is greater than the first preset temperature and greater than the second preset temperature;

[0019] Based on the sum of the preset water outlet temperature and the third preset temperature, the third target water outlet temperature is obtained, and the third target water outlet temperature is greater than the second target water outlet temperature;

[0020] When the actual outlet water temperature is greater than or equal to the third target outlet water temperature, the first duration is corrected.

[0021] In one embodiment, the correcting the first duration and the second duration based on the actual outlet water temperature further includes:

[0022] Based on the difference between the preset water outlet temperature and the third preset temperature, obtaining the fourth target water outlet temperature, wherein the fourth target water outlet temperature is lower than the first target water outlet temperature;

[0023] When the actual outlet water temperature is less than or equal to the fourth target outlet water temperature, the second duration is corrected.

[0024] In one embodiment, the first duration is calculated by the following formula:

[0025]

[0026] Among them, t is the first duration; P is the power value of the minimum load of the gas water heater; C is the specific heat capacity of water; ρ is the density of water; Q is the water flow rate; m is the water volume in the gas water heater; ΔT is the inlet and outlet water temperature difference of the bathroom water.

[0027] In one embodiment, the modifying the first duration includes:

[0028] Based on the product of the first duration and a first preset constant, a corrected first duration is obtained.

[0029] In one embodiment, the modifying the second duration includes:

[0030] Based on the product of the second duration and a second preset constant, a corrected second duration is obtained.

[0031] In one embodiment, the gas water heating equipment is a gas heating water boiler; in response to the gas water heating equipment being in a pulse combustion mode, the water pump and the fan of the gas heating water boiler are controlled to be in an operating state, wherein when the water pump and the fan are in an operating state, the heating water sequentially enters the main heat exchanger and the plate heat exchanger of the gas heating water boiler for heat exchange to heat the bathroom water.

[0032] In a second aspect, the present invention provides a combustion control device, comprising:

[0033] A first control module is used to obtain the actual outlet water temperature and the target outlet water temperature of the gas water heater in response to the gas water heater being in the bathroom mode; if the actual outlet water temperature is greater than the target outlet water temperature, control the gas water heater to enter the pulse combustion mode;

[0034] A second control module is used for controlling the burner of the gas water heater to be turned off and triggering statistics of a second duration of the burner being in the turned-off state in response to the gas water heater being in the pulse combustion mode; if the actual outlet water temperature is lower than the target outlet water temperature, controlling the burner to ignite and burn for a first duration and obtaining a second duration; wherein the first duration is obtained based on the equipment parameters of the gas water heater and the inlet and outlet water temperature difference of the bathroom water;

[0035] A correction module is used to correct the first duration and / or the second duration based on the actual outlet water temperature, and control the burner to operate with the corrected first duration and / or the second duration.

[0036] In a third aspect, the present invention further provides a gas water heater, comprising: a memory, a processor, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus;

[0037] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute the combustion control method as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] Figure 1 A schematic flow chart of a combustion control method according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic structural diagram of a gas water heater according to an embodiment of the present invention;

[0041] Figure 3 A schematic flow chart of a combustion control method according to another embodiment of the present invention;

[0042] Figure 4 A schematic flow chart of a combustion control method according to another embodiment of the present invention;

[0043] Figure 5 It is a structural schematic diagram of a combustion control device according to an embodiment of the present invention;

[0044] Figure 6 The present invention is a schematic diagram of the hardware structure of an electronic device of a gas water heater according to an embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 1. Main heat exchanger; 2. Heating water outlet pipe group; 3. Sanitary water outlet pipe group; 4. Sanitary water inlet pipe group; 5. Heating water inlet pipe group; 6. Bathroom inlet water temperature sensor; 7. Plate heat exchanger. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 are within the scope of protection of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the related art, taking a gas heating water heater as an example, in summer, the inlet water temperature of the gas heating water heater is high, and the required temperature rise is very small, which is easy to exceed the range that the gas heating water heater can control and adjust, resulting in the phenomenon of hot and cold water temperature. If you want to adjust the temperature of the bathroom water to a suitable temperature, you can reduce the power of the gas heating water heater, but the fire grate combustion cannot reduce the gas volume infinitely to reduce the power, otherwise it will cause backfire.

[0050] The relevant technology uses segmented combustion to reduce the heat load of gas heating water heaters. However, segmented combustion has the risk of slow flame transmission and flame transmission failure; due to structural design reasons, the load ratio of segmented combustion technology has certain limitations. The inlet water temperature of bathrooms is generally high in summer. Even if the gas heating water heater with segmented combustion is insufficient in water pressure or in certain specific conditions, the outlet water temperature of the bathroom will be too hot.

[0051] In view of this, the present invention provides a combustion control method, device and gas water heating equipment, which can maintain a flameout-ignition-extinguishing cycle working state by adjusting the burner of the gas water heating equipment to a first duration and a second duration without adding additional burner sectional valves and mixing valve components, and continuously correct the first duration and the second duration according to the actual water outlet temperature of the bathroom, thereby meeting the user's demand for bathroom water temperature; and solves the problem of excessively hot bathroom water outlet temperature caused by high bathroom water inlet temperature in summer exceeding the temperature control range of the gas water heating equipment.

[0052] like Figure 2As shown, an embodiment of the present invention provides a gas water heater, comprising: a main heat exchanger 1, a heating water outlet pipe group 2, a sanitary water outlet pipe group 3, a sanitary water inlet pipe group 4, a heating water inlet pipe group 5, a bathroom inlet temperature sensor 6 and a plate heat exchanger 7. The main heat exchanger 1 is connected to the heating water outlet pipe group 2 and the heating water inlet pipe group 5 respectively; the plate heat exchanger 7 is connected to the heating water outlet pipe group 2, the sanitary water outlet pipe group 3, the sanitary water inlet pipe group 4 and the heating water inlet pipe group 5 respectively. When the gas water heater is in heating mode, the heated heating water flows out from the heating water outlet pipe group 2, flows to the heating terminal, and then flows back to the gas water heater from the heating water inlet pipe group 5. When the gas water heater is in the bathroom mode, the heated heating water flows out from the heating water outlet pipe group 2, flows to the plate heat exchanger 7, and then flows back to the main heat exchanger 1 through the heating water inlet pipe group 5 for reheating. The sanitary cold water flows into the plate heat exchanger 7 from the sanitary water inlet pipe group 4, exchanges heat with the heating water in the plate heat exchanger 7, and the heated sanitary water flows out from the sanitary water outlet pipe group 3 and flows to the bathroom terminal. Among them, the bathroom inlet water temperature sensor 6 is used to detect the inlet temperature of the bathroom water. It can be understood that the gas water heater also includes a water outlet temperature sensor, etc., which is used to detect the outlet temperature of the bathroom water, and examples are not given here one by one.

[0053] It can be understood that the gas water heating equipment in the present invention includes but is not limited to a gas heating water heater and a gas water heater.

[0054] Combine the following Figures 1 to 4 , describing an embodiment of the present invention.

[0055] According to an embodiment of the present invention, Figure 1 As shown, on the one hand, a combustion control method is provided, the method comprising the following steps:

[0056] Step S100, in response to the gas water heater being in the bathroom mode, obtaining the actual water outlet temperature and the target water outlet temperature of the gas water heater; if the actual water outlet temperature is greater than the target water outlet temperature, controlling the gas water heater to enter the pulse combustion mode;

[0057] In step S100, when the gas water heater is in bathroom mode, the main controller compares the actual outlet water temperature with the target outlet water temperature. When the actual outlet water temperature is greater than the target outlet water temperature, it indicates that the hot water temperature has reached a high level and meets the use requirements. At this time, the gas water heater is controlled to enter the pulse combustion mode, the burner is turned off, and the heating stops.

[0058] Step S200, in response to the gas water heater being in the pulse combustion mode, controlling the burner of the gas water heater to be extinguished and triggering statistics of the second duration of the burner being in the extinguished state; if the actual outlet water temperature is lower than the target outlet water temperature, controlling the burner to ignite and burn for the first duration and obtaining the second duration; wherein the first duration is obtained based on the equipment parameters of the gas water heater and the inlet and outlet water temperature difference of the bathroom water;

[0059] In step S200, after the gas water heater enters the pulse combustion mode, the main controller can count the second duration of the burner of the gas water heater in the flameout state, that is, the time from the gas water heater entering the standby state to the next triggering of the heating condition. By calculating the second duration, the time interval of the gas water heater in the pulse combustion mode can be understood, providing a basis for optimizing the control strategy. When the gas water heater is in the pulse combustion mode, the main controller compares the actual water outlet temperature with the target water outlet temperature. If the actual water outlet temperature is lower than the target water outlet temperature, the current actual water outlet temperature is low and cannot meet the use requirements. At this time, the burner of the gas water heater is controlled to ignite and start burning with the first duration to heat the bathroom water. After the burner finishes burning with the first duration, the second duration is counted again.

[0060] Furthermore, the first duration is calculated by the following formula:

[0061]

[0062] Among them, t is the first duration; P is the power value of the minimum load of the gas water heater; C is the specific heat capacity of water; ρ is the density of water; Q is the water flow rate; m is the water volume in the gas water heater; ΔT is the inlet and outlet water temperature difference of the bathroom water.

[0063] The gas water heater is made to burn for the calculated first duration, and a burning time is provided when the gas water heater is ignited for the first time. After the burning time is over, the flame is turned off and the actual water outlet temperature is compared with the target water outlet temperature. This can help understand the heating speed and efficiency of the gas water heater and provide a reference for subsequent control strategies.

[0064] Step S300: Based on the actual outlet water temperature, the first duration and the second duration are corrected, and the burner is controlled to operate with the corrected first duration and the second duration.

[0065] In step S300, by comparing the actual outlet water temperature with the target outlet water temperature, when the heating effect of the gas water heater is not in line with expectations, the first duration and / or the second duration are corrected, and the gas water heater is controlled to operate with the corrected first duration and / or the second duration, so that the bathroom water temperature provided by the gas water heater can be more stable and meet the needs of users, avoiding discomfort to users due to excessively high or low bathroom water temperature. Among them, only the first duration can be corrected; or only the second duration can be corrected; or both the first duration and the second duration can be corrected. The specific correction method can be determined according to actual usage needs.

[0066] In this embodiment, when the gas water heater is in bathroom mode, that is, when the user is using hot water, by comparing the actual water outlet temperature and the target water outlet temperature, if the actual water outlet temperature is lower than the target water outlet temperature, the burner of the gas water heater is controlled to ignite to heat the bathroom water and increase the temperature of the bathroom water; when the actual water outlet temperature is higher than the target water outlet temperature, the bathroom water temperature meets the user's needs, and the gas water heater is controlled to enter the pulse combustion mode. In the pulse combustion mode, the burner of the gas water heater is controlled to be extinguished and the second duration of the burner of the gas water heater being in the extinguished state is counted, the burner of the gas water heater is controlled to be extinguished after burning for the first duration and to be ignited after the burner is in the extinguished state for the second duration, and the ignition is continued. The burner lasts for a first duration, and the cycle continues like this; then, based on the comparison between the actual water outlet temperature and the target water outlet temperature, when the heating effect of the gas water heater does not meet expectations, the first duration and the second duration are corrected, and the gas water heater is controlled to operate with the corrected first duration and the second duration. After the burner burns for the first duration, it is extinguished, and the waste heat of the heat exchanger is used to continue heating so that the temperature of the bathroom water meets the user's needs, avoiding the continuous heat absorption of the heat exchanger causing the bathroom water outlet temperature to be too hot; after the burner is extinguished for a second duration, it is ignited to heat the bathroom water and increase the temperature of the bathroom water outlet, so that the bathroom water temperature provided by the gas water heater is more stable and meets the user's needs, avoiding discomfort to the user due to excessively high or low bathroom water temperature. The present invention can maintain the actual outlet water temperature of the bathroom at a preset outlet water temperature by adjusting the burner of the gas water heater to maintain a flameout-ignition-extinguishing cycle working state for a first duration and a second duration without adding additional components such as a burner sectional valve and a water mixing valve, and continuously correcting the first duration and the second duration according to the actual outlet water temperature of the bathroom, thereby stabilizing the actual outlet water temperature of the bathroom at around a preset outlet water temperature and meeting the user's demand for bathroom water temperature; and solves the problem of excessively hot outlet water temperature of the bathroom caused by high inlet water temperature in summer exceeding the temperature control range of the gas water heater.

[0067] In one embodiment, the gas water heating equipment is a gas heating water boiler; in response to the gas water heating equipment being in a pulse combustion mode, the water pump and the fan of the gas heating water boiler are controlled to be in an operating state, wherein when the water pump and the fan are in an operating state, the heating water sequentially enters the main heat exchanger 1 and the plate heat exchanger 7 of the gas heating water boiler for heat exchange to heat the bathroom water.

[0068] In this embodiment, when the gas heating water heater is turned off, the water pump and fan of the gas heating water heater are still controlled to be in operation; when the water pump is running to make the water flow, the water flow signal can be detected by the sensor. After confirming that the water is flowing normally, the gas heating water heater believes that it has the basic conditions for ignition, thereby ensuring the safety and smooth progress of the ignition process. During the ignition process of the gas heating water heater, the fan needs to be pre-cleaned, that is, the combustible gas or exhaust gas that may remain in the combustion chamber is discharged to create a safe environment for ignition. The gas heating water heater will enter the ignition program only when the fan runs stably and the air environment in the combustion chamber meets the requirements. The continuous operation of the water pump and the fan makes sufficient preparations for early ignition, so that the gas heating water heater maintains the request ignition state; when the ignition conditions are met, the gas heating water heater is ignited immediately, so that the gas heating water heater can respond quickly when it is necessary to heat the bathroom water, further improving the user experience. Moreover, when the gas heating water heater is turned off, the water pump continues to be controlled to work, so that the water in the gas heating water heater can continue to flow in the heating internal circulation channel formed by the main heat exchanger 1 and the plate heat exchanger 7, so that the waste heat of the heating internal circulation water can continue to exchange heat with the bathroom water in the plate heat exchanger 7, and the heat is transferred to the bathroom water, so that the actual outlet water temperature of the bathroom water is still within the allowable temperature range, avoiding large fluctuations in the actual outlet water temperature of the bathroom water; it can also improve the overall efficiency of energy utilization.

[0069] In one of the embodiments, the method also includes: the target water outlet temperature includes a first target water outlet temperature and a second target water outlet temperature; wherein the first target water outlet temperature is lower than the second target water outlet temperature; in response to the gas water heater being in bathroom mode, if the actual water outlet temperature is higher than the second target water outlet temperature, the gas water heater is controlled to enter a pulse combustion mode; in response to the gas water heater being in the pulse combustion mode, if the actual water outlet temperature is lower than or equal to the first target water outlet temperature, the burner of the gas water heater is controlled to ignite and burn for a first duration.

[0070] In this embodiment, by comparing the actual water outlet temperature, the first target water outlet temperature and the second target water outlet temperature, if the actual water outlet temperature is less than or equal to the first target water outlet temperature, the burner of the gas water heater is controlled to ignite, and the burner is controlled to burn for a first duration to heat the bathroom water and increase the temperature of the bathroom water; when the actual water outlet temperature is greater than or equal to the second target water outlet temperature, the bathroom water temperature meets the user's needs, and the gas water heater is controlled to enter the pulse combustion mode, and at the same time, the second duration of the pulse combustion mode at the gas water heater is counted. Further, the first target water outlet temperature is set to a value lower than the preset water outlet temperature, so that the heating is started in time when the bathroom water temperature drops slightly, ensuring that the actual water outlet temperature of the bathroom water is maintained near the preset water outlet temperature. Setting the second target water outlet temperature to be greater than the preset water outlet temperature can prevent the bathroom water temperature from being too high, and can avoid the water temperature from continuing to rise and wasting energy or causing scalding risks to users, and also provides a clear condition for the gas water heater to enter the pulse combustion mode.

[0071] In one of the embodiments, the method also includes: obtaining the actual water outlet temperature, the preset water outlet temperature, the first preset temperature and the second preset temperature of the gas water heater in the bathroom mode; based on the preset water outlet temperature and the first preset temperature and the second preset temperature, calculating the first target water outlet temperature and the second target water outlet temperature.

[0072] In this embodiment, when the gas water heater is in the bathroom mode, the actual outlet water temperature of the bathroom water flowing out of the bathroom terminal is detected by the temperature sensor, and the actual outlet water temperature detected by the temperature sensor is transmitted to the main controller of the gas water heater; the main controller then obtains the preset outlet water temperature, the first preset temperature and the second preset temperature set by the user for subsequent use. Among them, the preset outlet water temperature is the temperature set on the gas water heater; the first preset temperature is the lower limit temperature that allows the actual outlet water temperature of the bathroom water to drop; the second preset temperature is the upper limit temperature that allows the actual outlet water temperature of the bathroom water to rise.

[0073] The first target water outlet temperature and the second target water outlet temperature can be calculated according to actual usage requirements; for example, the difference between the preset water outlet temperature and the first preset temperature is used as the first target water outlet temperature. If the preset water outlet temperature is 40°C and the first preset temperature is 3°C, the first target water outlet temperature is 37°C; the preset water outlet temperature and the second preset temperature are summed to obtain the second target water outlet temperature; if the preset water outlet temperature is 40°C and the second preset temperature is 3°C, the second target water outlet temperature is 43°C. Among them, the preset water outlet temperature is greater than the first preset temperature and the second preset temperature. It can be understood that the above temperature values ​​are exemplary, and the preset water outlet temperature, the first preset temperature and the second preset temperature can be set according to actual usage requirements.

[0074] like Figure 3 As shown, in one embodiment, step S300 includes:

[0075] Step S310, obtaining a third preset temperature; the third preset temperature is greater than the first preset temperature and greater than the second preset temperature;

[0076] Step S320: obtaining a third target water outlet temperature based on the sum of the preset water outlet temperature and the third preset temperature, wherein the third target water outlet temperature is greater than the second target water outlet temperature;

[0077] Step S330: When the actual outlet water temperature is greater than or equal to the third target outlet water temperature, the first duration is corrected.

[0078] In this embodiment, the third preset temperature is first obtained; then the third target water outlet temperature is calculated based on the preset water outlet temperature and the third preset temperature; for example, the preset water outlet temperature and the third preset temperature are summed to obtain the third target water outlet temperature. Since the third target water outlet temperature is greater than the second target water outlet temperature, when the actual water outlet temperature is greater than or equal to the third target water outlet temperature, the actual water outlet temperature has reached a higher temperature value; at this time, the first duration is corrected, and the first duration can be appropriately reduced, thereby reducing the ignition duration of the burner, so that the actual water outlet temperature is relatively reduced, and the bathroom water temperature is prevented from being too hot.

[0079] It is understandable that how to modify the first duration can be determined according to the design and requirements of the gas water heater, and the first duration can be increased or decreased to achieve better temperature control effect and energy efficiency. For example, when the actual outlet water temperature is much lower than the second target outlet water temperature, it means that the heating speed of the gas water heater is slow, and the first duration needs to be increased to increase the heating intensity so that the bathroom water temperature rises to the second target outlet water temperature more quickly.

[0080] In one embodiment, the first duration is modified, including: obtaining a modified first duration based on the product of the first duration and a first preset constant. Further, the expression for modifying the first duration is:

[0081] t1=t×X

[0082] Wherein, t1 is the first duration after correction; X is a constant, and the value range of X is 0.9-1.1.

[0083] like Figure 4 As shown, in one embodiment, step S300 further includes:

[0084] Step S340: obtaining a fourth target water outlet temperature based on the difference between the preset water outlet temperature and the third preset temperature, wherein the fourth target water outlet temperature is lower than the first target water outlet temperature;

[0085] Step S350: When the actual outlet water temperature is less than or equal to the fourth target outlet water temperature, the second duration is corrected.

[0086] In this embodiment, the fourth target water outlet temperature is calculated based on the preset water outlet temperature and the third preset temperature; for example, the difference between the preset water outlet temperature and the third preset temperature is used as the fourth target water outlet temperature. Since the fourth target water outlet temperature is lower than the first target water outlet temperature, when the actual water outlet temperature is lower than or equal to the fourth target water outlet temperature, the actual water outlet temperature is relatively low, which may reduce the user's water use experience; at this time, the second duration can be corrected to appropriately shorten the second duration, so that the burner of the gas water heater can enter the ignition heating state from the flameout state more quickly, so as to increase the actual water outlet temperature of the bathroom water.

[0087] It is understandable that how to modify the second duration can be determined according to the design and requirements of the gas water heater, and the second duration can be increased or decreased to achieve better temperature control effect and energy efficiency. By continuously modifying and adjusting the first duration and the second duration according to the actual outlet water temperature, the gas water heater can operate in a more optimized manner.

[0088] In one embodiment, the second duration is modified, including: obtaining a modified second duration based on the product of the second duration and a second preset constant. Further, the expression for modifying the second duration is:

[0089] t2=t3×Y

[0090] Wherein, t2 is the second duration after correction; t3 is the second duration; Y is a constant, and the value range of Y is 0.9-1.1. For example, Y is specifically 0.9, 0.95, 1.05, 1.1, etc.; the value of Y can be the same as the value of X. When the gas water heater is in the pulse combustion mode, the second duration can be obtained through the main controller.

[0091] It is understandable that when the operating power demand of the gas water heater changes or the water flow changes, the first duration and the second duration need to be revised, and combustion is performed with the revised first duration and standby is performed with the revised second duration.

[0092] In one of the embodiments, before step S100, the method further includes: in response to the actual outlet water temperature being greater than or equal to the second target outlet water temperature and lasting for a preset time, controlling the gas water heater to enter a pulse combustion mode.

[0093] In this embodiment, when the actual outlet water temperature of the bathroom water is greater than or equal to the second target outlet water temperature, the preset duration of continuous combustion of the gas water heater is determined to ensure that the actual outlet water temperature of the bathroom water temporarily reaches the target outlet water temperature due to non-accidental factors; for example, changes in air temperature in the external environment, abnormalities in the burner in the gas water heater, and short-term errors in the temperature sensor due to electromagnetic interference. When the gas water heater continues to burn and meets the preset combustion duration, the gas water heater is controlled to enter the pulse combustion mode. When the actual outlet water temperature of the bathroom water meets the requirements, controlling the gas water heater to enter the pulse combustion mode can avoid energy waste caused by continuous high-load combustion. When the gas water heater is in the pulse combustion mode, the actual outlet water temperature of the bathroom water can be flexibly controlled to avoid the bathroom water temperature being too high or too low, thereby improving the user experience. Among them, the preset duration can be 5s-8s; for example, 5s, 6s, 7s, 8s, etc., which can be set according to actual needs.

[0094] In one of the embodiments, before step S100, the method further includes: determining whether the gas water heater is burning at a minimum load, and if so, controlling the gas water heater to enter a pulse combustion mode.

[0095] In this embodiment, when the gas water heater has not yet entered the pulse combustion mode, it is determined whether the actual outlet water temperature of the bathroom water is greater than or equal to the second target outlet water temperature; if the actual outlet water temperature of the bathroom water is greater than or equal to the second target outlet water temperature, it is further determined whether the gas water heater is burning at the minimum load; to determine whether it is necessary to adjust the combustion load of the gas water heater, so as to achieve the purpose of accurate temperature control and energy saving. If the gas water heater burns at the minimum load, the duration of continuous combustion of the gas water heater at the minimum load is counted. By counting and analyzing the duration, the gas water heater can predict the trend of changes in the bathroom water temperature. If the continuous combustion time is long, the bathroom water temperature has a tendency to continue to rise, and the gas water heater can reduce the combustion load or stop combustion in advance to prevent the bathroom water temperature from being too high, ensuring that the bathroom water temperature can be relatively constant.

[0096] In one of the embodiments, the method further includes: determining a first preset temperature and a second preset temperature based on the operation conditions of a flameout cycle and an ignition cycle of the gas water heater.

[0097] In this embodiment, the first preset temperature and the second preset temperature are set to determine whether the current demand load of the gas water heater is less than the minimum load. A judgment condition is added for the gas water heater to enter the pulse combustion mode, and reaching the preset time is a judgment condition for further confirming that the pulse combustion mode can be entered.

[0098] The values ​​of the first preset temperature and the second preset temperature are related to the conditions of the flameout cycle and the ignition cycle. Taking the calculation of the second preset temperature as an example, assuming that the heat exchange efficiency is 100% and other heat losses are 0, it can be known that:

[0099] Q 总 =CMΔT=CM×(ΔT 升 +ΔT 降 );

[0100] Q 总 / t 总 =Q 散 ;

[0101] Q 熄 =Q 散 t 熄 ;

[0102] A=ΔT 降 =Q 熄 / CM=Q 散 ×t 熄 / CM;

[0103] Among them, Q 总 is the total heat in the cycle; C is the specific heat capacity of water; M is the mass of water; ΔT 升 is the temperature difference from low temperature to high temperature before entering the pulse combustion mode; ΔT 降 is the temperature difference from high temperature to low temperature after entering the pulse combustion mode; t 总 is the cycle time; Q 熄 is the heat dissipation during the flameout cycle; Q 散 is the unit heat dissipation (Kw / s); t 熄 is the flameout time; A is the second preset temperature. The unit heat dissipation is different under different bathroom water flow rates.

[0104] The value of the second preset temperature A cannot be too small. Since the ignition of the gas water heater takes a certain amount of time, when the gas water heater is in pulse combustion mode, the gas water heater is constantly exchanging heat. If the preset temperature is too small, the outlet water temperature of the bathroom water will be too low. The value of the second preset temperature A cannot be too large, otherwise the actual outlet water temperature of the gas water heater will exceed the set second target outlet water temperature by too much, resulting in overscalding of the water temperature.

[0105] The calculation method of the first preset temperature is consistent with the calculation method of the second preset temperature, which will not be described in detail. Further, the first preset temperature may be the same as the second preset temperature.

[0106] According to an embodiment of the present invention, Figure 5 As shown, on the other hand, a combustion control device is also provided, comprising:

[0107] The first control module 100 is used to obtain the actual outlet water temperature and the target outlet water temperature of the gas water heater in response to the gas water heater being in the bathroom mode; if the actual outlet water temperature is greater than the target outlet water temperature, control the gas water heater to enter the pulse combustion mode;

[0108] The second control module 200 is used to control the burner of the gas water heater to be turned off in response to the gas water heater being in the pulse combustion mode and trigger the statistics of the second duration of the burner being in the turned-off state; if the actual outlet water temperature is lower than the target outlet water temperature, the burner is controlled to ignite and burn for the first duration and obtain the second duration; wherein the first duration is obtained based on the equipment parameters of the gas water heater and the inlet and outlet water temperature difference of the bathroom water;

[0109] The first duration is calculated by the following formula:

[0110]

[0111] Among them, t is the first duration; P is the power value of the minimum load of the gas water heater; C is the specific heat capacity of water; ρ is the density of water; Q is the water flow rate; m is the water volume in the gas water heater; ΔT is the inlet and outlet temperature difference of the bathroom water. The gas water heater is a gas heating water heater; when the gas water heater is in the pulse combustion mode, the water pump and the fan of the gas heating water heater are controlled to be in the running state, wherein when the water pump and the fan are in the running state, the heating water is sequentially entered into the main heat exchanger and the plate heat exchanger of the gas heating water heater for heat exchange to heat the bathroom water.

[0112] The correction module 300 is used to correct the first duration and / or the second duration based on the actual outlet water temperature, and control the burner to operate with the corrected first duration and / or the second duration.

[0113] In one embodiment, the target outlet water temperature includes a first target outlet water temperature and a second target outlet water temperature; wherein the first target outlet water temperature is less than the second target outlet water temperature;

[0114] The first control module 100 is also used to control the gas water heater to enter the pulse combustion mode in response to the gas water heater being in the bathroom mode, if the actual outlet water temperature is greater than the second target outlet water temperature;

[0115] The second control module 200 is also used to control the burner of the gas water heater to ignite and burn for a first duration in response to the gas water heater being in the pulse combustion mode if the actual outlet water temperature is less than or equal to the first target outlet water temperature.

[0116] In one embodiment, it also includes:

[0117] An acquisition module, used to acquire the actual outlet water temperature, the preset outlet water temperature, the first preset temperature and the second preset temperature of the gas water heater in the bathroom mode;

[0118] The calculation module is used to calculate a first target water outlet temperature and a second target water outlet temperature based on the preset water outlet temperature and the first preset temperature and the second preset temperature.

[0119] In one embodiment, the correction module 300 includes:

[0120] An acquisition unit, used for acquiring a third preset temperature; the third preset temperature is greater than the first preset temperature and greater than the second preset temperature;

[0121] A first calculation unit, configured to obtain a third target outlet water temperature based on the sum of the preset outlet water temperature and the third preset temperature, wherein the third target outlet water temperature is greater than the second target outlet water temperature;

[0122] The first correction unit is used to correct the first duration when the actual outlet water temperature is greater than or equal to the third target outlet water temperature.

[0123] In one embodiment, the correction module 300 further includes:

[0124] a second calculation unit, configured to obtain a fourth target outlet water temperature based on a difference between the preset outlet water temperature and the third preset temperature, wherein the fourth target outlet water temperature is lower than the first target outlet water temperature;

[0125] The second correction unit is used to correct the second duration when the actual outlet water temperature is less than or equal to the fourth target outlet water temperature.

[0126] In one embodiment, the correction module 300 includes:

[0127] Based on the product of the first duration and the first preset constant, a corrected first duration is obtained.

[0128] In one embodiment, the correction module 300 further includes:

[0129] Based on the product of the second duration and the second preset constant, a corrected second duration is obtained.

[0130] Figure 6The schematic diagram of the structure of an embodiment of a gas water heater provided by an embodiment of the present invention is shown. The specific embodiment of the present invention does not limit the specific implementation of the gas water heater.

[0131] like Figure 6 As shown, the gas water heater may include: a processor (processor) 502 , a communications interface (Communications Interface) 504 , a memory (memory) 506 , and a communications bus 508 .

[0132] The processor 502, the communication interface 504, and the memory 506 communicate with each other via a communication bus 508. The communication interface 504 is used to communicate with other devices such as a client or other server network elements. The processor 502 is used to execute a program 510, which can specifically execute the relevant steps in the above-mentioned embodiment of the combustion control method.

[0133] Specifically, the program 510 may include program code including computer-executable instructions.

[0134] The processor 502 may be a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiment of the present invention. The one or more processors included in the gas water heater may be processors of the same type, such as one or more CPUs; or processors of different types, such as one or more CPUs and one or more ASICs.

[0135] The memory 506 is used to store the program 510. The memory 506 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0136] The program 510 can be specifically called by the processor 502 to enable the gas water heater to execute the relevant steps in the above-mentioned embodiment of the combustion control method.

[0137] It can be understood by those skilled in the art that Figure 6 The structure shown is only for illustration and does not limit the structure of the above-mentioned equipment. Figure 6 More or fewer components as shown, or with Figure 6 Different configurations shown.

[0138] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0139] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0140] The specific contents of the above specific embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A combustion control method, characterized in that: The method comprises: In response to the gas water heater being in bathroom mode, obtaining an actual outlet water temperature and a target outlet water temperature of the gas water heater; If the actual outlet water temperature is greater than the target outlet water temperature, the gas water heater is controlled to enter a pulse combustion mode; In response to the gas water heater being in the pulse combustion mode, the burner of the gas water heater is controlled to be extinguished and the statistics of the second duration of the burner being in the extinguished state are triggered; if the actual outlet water temperature is lower than the target outlet water temperature, the burner is controlled to ignite and burn for the first duration and obtain the second duration; wherein the first duration is obtained based on the equipment parameters of the gas water heater and the inlet and outlet water temperature difference of the bathroom water; Based on the actual outlet water temperature, the first duration and the second duration are corrected, and the burner is controlled to operate with the corrected first duration and the second duration.

2. The combustion control method according to claim 1, characterized in that: The method further includes: the target outlet water temperature includes a first target outlet water temperature and a second target outlet water temperature; wherein the first target outlet water temperature is less than the second target outlet water temperature; In response to the gas water heater being in the bathroom mode, if the actual outlet water temperature is greater than the second target outlet water temperature, controlling the gas water heater to enter the pulse combustion mode; In response to the gas water heater being in the pulse combustion mode, if the actual outlet water temperature is less than or equal to the first target outlet water temperature, the burner of the gas water heater is controlled to ignite and burn for a first duration.

3. The combustion control method according to claim 2, characterized in that: The method further comprises: Obtaining the actual water outlet temperature, the preset water outlet temperature, the first preset temperature and the second preset temperature of the gas water heater in the bathroom mode; The first target water outlet temperature and the second target water outlet temperature are calculated based on the preset water outlet temperature, the first preset temperature and the second preset temperature.

4. The combustion control method according to claim 3, characterized in that: The correcting the first duration and the second duration based on the actual outlet water temperature includes: Acquire a third preset temperature; the third preset temperature is greater than the first preset temperature and greater than the second preset temperature; Based on the sum of the preset water outlet temperature and the third preset temperature, a third target water outlet temperature is obtained, wherein the third target water outlet temperature is greater than the second target water outlet temperature; When the actual outlet water temperature is greater than or equal to the third target outlet water temperature, the first duration is corrected.

5. The combustion control method according to claim 4, characterized in that: The step of correcting the first duration and the second duration based on the actual outlet water temperature further includes: Based on the difference between the preset water outlet temperature and the third preset temperature, a fourth target water outlet temperature is obtained, wherein the fourth target water outlet temperature is lower than the first target water outlet temperature; When the actual outlet water temperature is less than or equal to the fourth target outlet water temperature, the second duration is corrected.

6. The combustion control method according to claim 1, characterized in that: The first duration is calculated by the following formula: Among them, t is the first duration; P is the power value of the minimum load of the gas water heater; C is the specific heat capacity of water; ρ is the density of water; Q is the water flow rate; m is the water volume in the gas water heater; ΔT is the inlet and outlet water temperature difference of the bathroom water.

7. The combustion control method according to claim 1, characterized in that: The modifying of the first duration includes: Based on the product of the first duration and a first preset constant, a corrected first duration is obtained.

8. The combustion control method according to claim 1, characterized in that: The modifying of the second duration includes: Based on the product of the second duration and a second preset constant, a corrected second duration is obtained.

9. The combustion control method according to claim 1, characterized in that: The gas water heater is a gas heating water heater; in response to the gas water heater being in pulse combustion mode, the water pump and the fan of the gas heating water heater are controlled to be in operation, wherein when the water pump and the fan are in operation, the heating water sequentially enters the main heat exchanger and the plate heat exchanger of the gas heating water heater for heat exchange, so as to heat the bathroom water.

10. A combustion control device, characterized in that: include: A first control module, configured to obtain an actual outlet water temperature and a target outlet water temperature of the gas water heater in response to the gas water heater being in a bathroom mode; If the actual outlet water temperature is greater than the target outlet water temperature, the gas water heater is controlled to enter a pulse combustion mode; A second control module is used for controlling the burner of the gas water heater to be turned off and triggering statistics of a second duration of the burner being in the turned-off state in response to the gas water heater being in the pulse combustion mode; if the actual outlet water temperature is lower than the target outlet water temperature, controlling the burner to ignite and burn for a first duration and obtaining a second duration; wherein the first duration is obtained based on the equipment parameters of the gas water heater and the inlet and outlet water temperature difference of the bathroom water; A correction module is used to correct the first duration and / or the second duration based on the actual outlet water temperature, and control the burner to operate with the corrected first duration and the second duration.

11. A gas water heater, characterized in that: include: A memory, a processor, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute the combustion control method according to any one of claims 1 to 9.

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