Control method of water heater, water heater and storage medium

Abstract

The invention discloses a control method of a water heater, the water heater and a storage medium. The method comprises the steps that when the water heater is in a minimum load operation state, the water outlet temperature of the water heater is detected; and when the outlet water temperature meets the first preset condition, the water heater is controlled to stop heating. The invention aims to reduce the minimum load of the water heater and improve the water use comfort of the water heater.

Description

Technical Field

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

[0002] The minimum load of a water heater is a key indicator of the whole machine, reflecting the minimum temperature rise when the water flow is certain. Among them, the minimum load is often limited by the structure. Changing the structure of the water heater can reduce its minimum load. However, this method results in the minimum load cannot be reduced after the whole structure of the water heater is determined, which easily leads to the actual outlet water temperature being too high when the water heater is running at the minimum load, causing the water output of the water heater to deviate from the user's comfort needs. Summary of the invention

[0003] The main purpose of the present invention is to provide a control method for a water heater, a water heater and a storage medium, aiming to reduce the minimum load of the water heater and improve the water use comfort of the water heater.

[0004] To achieve the above object, the present invention provides a control method for a water heater, the control method for a water heater comprising the following steps:

[0005] When the water heater is in a minimum load operation state, detecting the outlet water temperature of the water heater;

[0006] When the outlet water temperature meets a first preset condition, the water heater is controlled to stop heating.

[0007] Optionally, the first preset condition includes that the outlet water temperature is greater than a set temperature of the water heater, and a temperature difference between the outlet water temperature and the set temperature is not less than a first temperature difference threshold.

[0008] Optionally, the first preset condition also includes that a change value corresponding to the outlet water temperature is less than a preset value.

[0009] Optionally, after the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the method further includes:

[0010] When the outlet water temperature of the water heater drops to meet a second preset condition, the water heater is controlled to start heating.

[0011] Optionally, the second preset condition includes at least one of the following conditions:

[0012] The current outlet water temperature of the water heater is greater than the set temperature of the water heater, and the temperature difference between the current outlet water temperature and the set temperature of the water heater is not greater than a second temperature difference threshold;

[0013] The duration during which the water heater stops heating is not less than the target duration.

[0014] Optionally, the target duration is negatively correlated with the water inlet flow rate of the water heater.

[0015] Optionally, when the outlet water temperature of the water heater drops to meet the second preset condition, before the step of controlling the water heater to start heating, the method further includes:

[0016] Obtaining the number of times the water heater stops heating in the minimum load operation state and / or the first outlet water temperature change value when the water heater stopped heating last time and / or the ambient temperature corresponding to the water heater;

[0017] The second temperature difference threshold is determined according to the number of times and / or the first outlet water temperature change value and / or the ambient temperature.

[0018] Optionally, the step of determining the second temperature difference threshold according to the number of times and / or the first outlet water temperature change value and / or the ambient temperature includes:

[0019] Acquire a target correspondence between the number of times, the first outlet water temperature change value and the second temperature difference threshold value according to the ambient temperature;

[0020] The second temperature difference threshold corresponding to the number of times and the first outlet water temperature change value is determined according to the target corresponding relationship.

[0021] Optionally, after the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the method further includes:

[0022] The water heater is controlled to maintain a water inlet and outlet state, and the step of controlling the water heater to start heating is performed when the outlet water temperature of the water heater drops to meet a second preset condition.

[0023] Optionally, when the outlet water temperature of the water heater drops to meet a second preset condition, the step of controlling the water heater to start heating includes:

[0024] When the outlet water temperature of the water heater drops to meet the second preset condition, obtaining the outlet water temperature change rate of the water heater after the water heater stops heating, and the temperature difference between the current outlet water temperature of the water heater and the set temperature of the water heater;

[0025] adjusting the current water inlet flow rate of the water heater according to the temperature difference between the current outlet water temperature and the set temperature of the water heater and the rate of change of the outlet water temperature;

[0026] The water heater is controlled to start heating.

[0027] Optionally, after the step of controlling the water heater to start heating, the method further includes:

[0028] Return to the step of detecting the outlet water temperature of the water heater when the water heater is in the minimum load operation state.

[0029] Optionally, the water heater comprises a combustion chamber and a fan disposed in the combustion chamber, and after the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the step further comprises:

[0030] The fan is controlled to run at a speed not greater than a preset speed to exhaust smoke in the combustion chamber until the water heater starts heating.

[0031] Optionally, the water heater control method further includes:

[0032] When the water heater is in a minimum load operation state, obtaining a second outlet water temperature change value of the water heater;

[0033] When the second outlet water temperature change value is less than a preset value, the step of detecting the outlet water temperature of the water heater is performed.

[0034] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a water heater, which includes: a memory, a processor, and a control program of the water heater stored in the memory and executable on the processor, and when the control program of the water heater is executed by the processor, the steps of the control method of the water heater as described in any one of the above items are implemented.

[0035] In addition, in order to achieve the above-mentioned purpose, the present application also proposes a storage medium, on which a control program of a water heater is stored. When the control program of the water heater is executed by a processor, the steps of the control method of the water heater as described in any of the above items are implemented.

[0036] The present invention proposes a control method for a water heater, which controls the water heater to stop heating when the outlet water temperature meets a first preset condition when the water heater is in a minimum load operating state, thereby effectively avoiding excessive temperature rise when the water heater is running at the minimum load, resulting in excessively high outlet water temperature, effectively reducing the minimum load of the whole machine, widening the outlet water temperature range of the water heater, and effectively improving the water use comfort of the water heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the hardware structure involved in the operation of an embodiment of a water heater of the present invention;

[0038] Figure 2 A schematic diagram of a flow chart of an embodiment of a method for controlling a water heater of the present invention;

[0039] Figure 3 A schematic flow chart of another embodiment of a method for controlling a water heater according to the present invention;

[0040] Figure 4 The figure is a flow chart of another embodiment of the water heater control method of the present invention.

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0043] In the prior art, the minimum load of the water heater is limited by the structure of the whole machine. The minimum load is set based on the structure of the whole machine. After the structure of the water heater is determined, the minimum load cannot be reduced. When the water flow rate is small, even if the water heater burns at the minimum load, the actual water outlet temperature will be too high, causing the water outlet of the water heater to deviate from the user's comfort needs.

[0044] The solution proposed in the embodiment of the present invention is that when the load demand of the whole machine is at the minimum load under the condition of continuous water flow, the main control of the whole machine will control the whole machine to burn at the minimum load. After the minimum load burns and the outlet water temperature remains stable, if the actual outlet water temperature is significantly higher than the set temperature, the combustion is forced to be shut down. At this time, after the whole machine is not turned off, cold water flows in from the water inlet and out from the water outlet, which will inevitably cause the outlet water temperature to drop. When the actual outlet water temperature drops to close to the set temperature or the forced shutdown time reaches a certain time, the combustion is re-ignited. Such repeated combustion, extinguishing, ignition, combustion and extinguishing can effectively reduce the minimum load combustion time and thus reduce the "minimum load" of the whole machine. The outlet water temperature can reach more temperature points, thereby effectively widening the range of the outlet water temperature under small water flow.

[0045] The embodiment of the present invention provides a water heater. In this embodiment, the water heater is a gas water heater. In other embodiments, the water heater may also be other types of water heaters, such as an electric water heater, an air energy water heater, etc.

[0046] In an embodiment of the present invention, the water heater includes a shell, a fan 200, a burner 300 and a water circuit. A water inlet, a water outlet and an exhaust port are arranged on the shell. A combustion chamber is arranged in the shell. The burner 300, the fan 200 and the water circuit are all arranged in the combustion chamber.

[0047] One end of the water channel is connected to the water inlet and the other end of the water channel is connected to the water outlet. External water can enter the water channel from the water inlet, and the water in the water channel can flow out of the water heater from the water outlet. The burner 300 can be used to heat the water flowing through the water channel.

[0048] When the fan 200 is turned on, it can drive the smoke in the combustion chamber to be discharged outside the water heater from the exhaust port.

[0049] The burner 300 releases heat by burning combustible gas. The burner 300 includes a fire grate and a gas proportional valve. The fire grate can be connected to the gas source through the gas proportional valve. The gas proportional valve can adjust the amount of gas entering the fire grate to adjust the heat of the fire grate.

[0050] The air conditioner further includes a temperature sensor 400 , which is disposed at the water outlet. The temperature sensor 400 can be used to detect the outlet water temperature.

[0051] Among them, refer to Figure 1 The water heater further comprises a control device 100, and the fan 200, the burner 300 and the temperature sensor 400 are all connected to the control device 100. The control device 100 of the water heater comprises: a processor 1001, such as a CPU, a memory 1002, and a timer 1003. Among them, these components are connected and communicated through a communication bus. The memory 1002 can be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. The memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0052] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation of the device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0053] like Figure 1 As shown, the memory 1002 as a computer storage medium may include a control program for the water heater.

[0054] exist Figure 1 In the device shown, the processor 1001 can be used to call the water heater control program stored in the memory 1002 and execute the relevant step operations of the water heater control method in the following embodiment.

[0055] An embodiment of the present invention further provides a control method for a water heater, which is applied to a water heater.

[0056] Reference Figure 2 , an embodiment of a control method for a water heater of the present application is proposed. In this embodiment, the control method for the water heater includes:

[0057] Step S10, when the water heater is in a minimum load operation state, detecting the outlet water temperature of the water heater;

[0058] In the preset mode, the water heater can maintain the water inlet and outlet state and heat the circulating water. In the preset mode, heating-related components (such as gas proportional valve and / or fan, etc.) in the water heater are controlled based on the temperature difference between the outlet water temperature and the set temperature of the water heater.

[0059] The operating parameters of the heating-related components obtained by pre-testing when the water heater is in the minimum load operating state are preset operating parameters. The operating parameters of these components are monitored during the operation of the water heater. When the monitored operating parameters match the preset operating parameters, it can be determined that the water heater is in the minimum load operating state. For example, when the opening of the proportional valve is monitored to be the minimum opening, it can be determined that the water heater is in the minimum load operating state.

[0060] The outlet water temperature is specifically detected by the temperature sensor, wherein the outlet water temperature of the water heater can be detected at intervals or in real time.

[0061] Step S20: When the outlet water temperature meets a first preset condition, the water heater is controlled to stop heating.

[0062] The first preset condition is specifically a condition that the outlet water temperature needs to meet when the minimum temperature rise (difference between the inlet water temperature and the outlet water temperature) of the water heater under the minimum load state is greater than a preset threshold. Specifically, the first preset condition may include a preset temperature range that the outlet water temperature needs to reach and / or a quantitative relationship or size relationship that needs to be reached between the outlet water temperature and the characteristic temperature.

[0063] In this embodiment, the water heater is a gas water heater, and the step of controlling the water heater to stop heating includes: controlling the burner in the water heater to turn off.

[0064] When the outlet water temperature does not meet the first preset condition, the water heater can be controlled to maintain the heating state.

[0065] A control method for a water heater is proposed in an embodiment of the present invention. When the water heater is in a minimum load operating state, the water heater is controlled to stop heating when the outlet water temperature meets a first preset condition, thereby effectively avoiding excessive temperature rise when the water heater is running at a minimum load, resulting in excessive outlet water temperature, effectively reducing the minimum load of the whole machine, broadening the outlet water temperature range of the water heater, and effectively improving the water use comfort of the water heater.

[0066] Furthermore, in this embodiment, when the water heater is in the on state, the first state and the second state of the water heater can be obtained, the first state includes whether the water heater is flowing with water, and the second state includes whether the water heater is in a combustion state. When the water heater is flowing with water and the water heater is in a combustion state, step S10 is executed.

[0067] In this embodiment, step S10 may be executed when the water flow rate introduced into the water heater is less than a preset flow rate and the water heater is in a combustion state.

[0068] Furthermore, in this embodiment, the first preset condition includes that the outlet water temperature is greater than the set temperature of the water heater, and the temperature difference between the outlet water temperature and the set temperature is not less than a first temperature difference threshold.

[0069] The set temperature is a preset target value that the outlet water temperature of the water heater needs to reach, which can be a temperature set by the user or a temperature determined based on the monitored user status.

[0070] The first temperature difference threshold is specifically a critical value used to distinguish whether there is a risk of excessive minimum temperature rise during the minimum load operation of the water heater.

[0071] The first temperature difference threshold may be a preset fixed value, or a value determined according to the actual operating condition of the water heater.

[0072] In this embodiment, when the water heater is in the minimum load state, the outlet water temperature is too much higher than the set temperature, which can be considered to be caused by the excessive minimum temperature rise, resulting in the outlet water temperature being too high. At this time, stopping heating is beneficial to reducing the minimum temperature rise, so that the outlet water temperature can be closer to the set temperature required by the user's comfort, effectively increasing the adjustable range of the outlet water temperature and improving the user's water use comfort.

[0073] In other embodiments, the first preset condition may also include that the temperature difference between the outlet water temperature and the inlet water temperature is greater than a preset threshold.

[0074] Furthermore, in this embodiment, the first preset condition also includes that the change value corresponding to the outlet water temperature is less than a preset value.

[0075] The outlet water temperature here is the current temperature value of the outlet water of the water heater.

[0076] The change value corresponding to the outlet water temperature can be determined based on the outlet water temperature and the historical temperature of the outlet water of the water heater within a set time period before the current moment.

[0077] The change value corresponding to the outlet water temperature can reflect the stability of the water temperature.

[0078] The preset value here may be a fixed value set in advance, or a value determined according to the actual operating state of the water heater, or a value determined by obtaining user-set parameters.

[0079] When the change value is less than the preset value and lasts for the preset time, it indicates that the outlet water temperature is stable.

[0080] In this embodiment, when the outlet water temperature reaches a stable state during the operation of the water heater at the minimum load, it is determined whether to stop heating based on the outlet water temperature. This is beneficial to improving the accuracy of the water heater heating stop control, avoiding unnecessary stopping of the water heater, and effectively improving the water use comfort of the water heater.

[0081] Further, based on the above embodiment, another embodiment of the control method of the water heater of the present application is proposed. In this embodiment, referring to Figure 3 , after the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the method further includes:

[0082] Step S30, when the outlet water temperature of the water heater drops to meet a second preset condition, controlling the water heater to start heating.

[0083] The second preset condition is specifically a condition that the outlet water temperature of the pre-set water heater needs to meet when the outlet water temperature has a risk of deviating from the user's comfort. The second preset condition may include a preset temperature range that the outlet water temperature needs to reach and / or a quantitative relationship or size relationship that the outlet water temperature needs to reach with the characteristic temperature.

[0084] In this embodiment, the water heater is a gas water heater, and the step of controlling the water heater to start heating includes: controlling the burner in the water heater to ignite and burn.

[0085] The water heater is controlled to start heating according to the parameters actually monitored by the water heater. The interval between the starting moment when the water heater runs at the minimum load before stopping heating this time and the moment when the outlet water temperature meets the first preset condition can also be obtained. The operating parameters of the water heater are determined according to the interval, the current outlet water temperature and the set temperature of the water heater, and the water heater is controlled to start heating with the determined operating parameters.

[0086] In this embodiment, after the water heater stops heating, when the outlet water temperature drops to reach the second preset condition, the water heater is controlled to start heating, which helps to avoid excessive drop in outlet water temperature affecting user comfort, thereby further improving the water use comfort of the water heater.

[0087] Furthermore, in this embodiment, when the outlet water temperature of the water heater drops to meet the second preset condition, after the step of controlling the water heater to start heating, the process may return to step S10. Based on this, when the water heater is running at the minimum load, the water heater can be controlled to start and stop heating by adapting to the outlet water temperature to ensure that the outlet water temperature reaches the user's comfortable temperature while the outlet water temperature is not too high, thereby ensuring that the user can obtain a continuous comfortable experience when using the water heater.

[0088] Further, in this embodiment, the second preset condition includes at least one of the following conditions:

[0089] Condition 1: the current outlet water temperature of the water heater is greater than the set temperature of the water heater, and the temperature difference between the current outlet water temperature and the set temperature of the water heater is not greater than a second temperature difference threshold;

[0090] Condition 2: The duration during which the water heater stops heating is not less than the target duration.

[0091] The set temperature here is the same concept as the set temperature mentioned above and will not be elaborated here.

[0092] The second temperature difference threshold here is smaller than the first temperature difference threshold mentioned above.

[0093] The target duration can be a pre-set fixed duration, or a duration determined according to the actual operation of the water heater. In the present embodiment, the target duration is negatively correlated with the water inlet flow rate of the water heater. Specifically, the water inlet flow rate of the water heater during the process of stopping heating can be obtained, and the target duration here can be determined according to the water inlet flow rate. For example, the target duration here can be obtained by calculating the water inlet flow rate or looking up a table. Based on this, it is beneficial to improve the accuracy of the target duration, ensure that the timing of starting the heating of the water heater can be accurately matched with the degree of cooling caused by the water inlet during the process of stopping heating, and further improve the water use comfort of the water heater.

[0094] In this embodiment, when condition 1 is met, it indicates that the outlet water temperature of the water heater has dropped to a temperature close to the set temperature. If the outlet water temperature continues to drop, it will not reach the set temperature for user comfort. When condition 2 is met, it indicates that the outlet water temperature of the water heater drops significantly and there is a risk of not reaching the user's comfortable temperature. Based on this, timely control of the water heater to start heating is conducive to timely replenishment of heat to ensure that the water outlet of the water heater can meet the user's comfort needs and further improve the water comfort of the water heater.

[0095] In other embodiments, the second preset condition may also include that the drop in the outlet water temperature is greater than a preset drop, or the second preset condition may also include that the temperature difference between the current outlet water temperature and the set temperature is less than a preset temperature difference, and so on.

[0096] Furthermore, in the present embodiment, when the outlet water temperature of the water heater drops to meet the second preset condition, before the step of controlling the water heater to start heating, it also includes: obtaining the number of times the water heater stops heating in the minimum load operation state and / or the first outlet water temperature change value during the last heating stop process of the water heater and / or the ambient temperature corresponding to the water heater; determining the second temperature difference threshold value based on the number and / or the first outlet water temperature change value and / or the ambient temperature.

[0097] After the water heater is turned on, its water outlet temperature can be monitored every time it is in the minimum load operating state. When the water outlet temperature meets the first preset condition, the water heater can be controlled to stop heating. Based on this, the total number of times the water heater stops heating in the time period from when the water heater is turned on to the current moment is taken as the number here.

[0098] When the outlet water temperature is greater than the set temperature after the water heater is turned on, heating can be performed and stopped based on the outlet water temperature, and the total change value of the outlet water temperature during the process of stopping heating between the current heating and the last heating of the water heater is obtained as the first outlet water temperature change value here.

[0099] The ambient temperature specifically refers to the temperature of the environment where the water heater is located, which can be detected by an environmental detection module provided on the water heater, or by an environmental detection module outside the water heater and provided in the environment where the water heater is located.

[0100] When the water heater is in the minimum load operation state, the order between the water outlet temperature detection of the water heater and the acquisition of the number of times and / or the first water outlet temperature change value and / or the ambient temperature is not specifically limited.

[0101] In this embodiment, the second temperature difference threshold here is determined in combination with the number of times, the first outlet water temperature change value and the ambient temperature. Among them, the correspondence between the number of times, the first outlet water temperature change value, the ambient temperature and the second temperature difference threshold can be established in advance, and the correspondence may include a calculation formula, an algorithm rule or a mapping relationship, etc. Based on the correspondence, the second temperature difference threshold corresponding to the current number of times, the first outlet water temperature change value and the ambient temperature can be determined.

[0102] In this embodiment, the target correspondence between the number of times, the first outlet water temperature change value and the second temperature difference threshold is obtained according to the ambient temperature; and the second temperature difference threshold corresponding to the number of times and the first outlet water temperature change value is determined according to the target correspondence. Different ambient temperatures correspond to different target correspondences. More than one correspondence between the number of times, the first outlet water temperature change value and the second temperature difference threshold can be preset, and different correspondences correspond to different ambient intervals. Based on this, the temperature interval where the current ambient temperature is located can be determined, and the correspondence associated with the temperature interval is used as the target correspondence. The target correspondence may include calculation formulas, mapping relationships, and other forms.

[0103] In this embodiment, the number of times and / or the first water outlet temperature change value and / or the ambient temperature can accurately reflect the risk of excessive minimum temperature rise when the water heater is operating at minimum load. Therefore, the second temperature difference threshold is set according to the number of times and / or the first water outlet temperature change value and / or the ambient temperature, which is beneficial to improve the accuracy of the setting of the second temperature difference threshold, avoid frequent start and stop of the water heater, and improve the operating stability of the water heater while reducing the minimum load and improving the water use comfort of the water heater users.

[0104] In other embodiments, a quantitative relationship between the number of times, the first water outlet temperature change value, the ambient temperature and the second temperature difference threshold is directly set, and the second temperature difference threshold can be calculated by directly substituting the number of times, the first water outlet temperature change value and the ambient temperature into the quantitative relationship.

[0105] In other embodiments, the second temperature difference threshold may also be determined based on one or two of the number of times, the first outlet water temperature change value, and the ambient temperature.

[0106] In this embodiment, after the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the water heater can be controlled to maintain the water inlet and outlet state, and the step of controlling the water heater to start heating when the outlet water temperature of the water heater drops to meet the second preset condition is performed. The water heater maintains the water inlet and outlet state means that the water outside the water heater maintains to flow into the water heater from the water inlet, mixes with the hot water inside the water heater, and then flows out of the water heater from the water outlet. Based on this, it is helpful to ensure that stopping the heating process will not affect the normal water use of users.

[0107] Furthermore, step S3 includes: when the outlet water temperature of the water heater drops to meet the second preset condition, obtaining the outlet water temperature change rate of the water heater after the water heater stops heating, and the temperature difference between the current outlet water temperature of the water heater and the set temperature of the water heater; adjusting the current water inlet flow of the water heater according to the temperature difference between the current outlet water temperature and the set temperature of the water heater and the outlet water temperature change rate; and controlling the water heater to start heating.

[0108] The outlet water temperature change rate specifically represents the drop in the outlet water temperature of the water heater within a preset time after the water heater stops heating. The preset time here is less than or equal to the above-mentioned target time.

[0109] In one implementation, the flow adjustment value can be determined according to the second outlet water temperature change value and the temperature difference value, and different second outlet water temperature change values ​​and different temperature difference values ​​correspond to different flow adjustment values, and the current water inlet flow of the water heater can be adjusted according to the flow adjustment value. The corresponding relationship between the second outlet water temperature change value, the temperature difference value and the flow adjustment value is obtained according to the total time from the moment the water heater stops heating to the current moment, and different total time lengths correspond to different corresponding relationships. Based on the determined corresponding relationship, the flow adjustment value corresponding to the current second outlet water temperature change value and the temperature difference value can be determined.

[0110] In another implementation, when the outlet water temperature change rate is less than a preset change rate, the flow adjustment amount can be determined according to the temperature difference value, and the water inlet flow rate can be reduced according to the flow adjustment amount; when the outlet water temperature change rate is greater than or equal to the preset change rate, the flow adjustment amount can be determined according to the temperature difference value, and the water inlet flow rate of the water heater can be increased according to the flow adjustment amount.

[0111] In this embodiment, the outlet water temperature change rate and the temperature difference value can accurately reflect the risk of excessive minimum temperature rise after the water heater restarts heating. Based on this, the water inlet flow rate is adjusted according to the outlet water temperature change rate and the temperature difference value to avoid the water heater stopping heating soon after restarting heating due to excessive temperature rise, thereby widening the water use temperature range of the water heater, improving water use comfort, and avoiding frequent start and stop heating of the water heater, thereby improving the operating stability of the water heater.

[0112] Further, based on any of the above embodiments, another embodiment of the control method of the water heater of the present application is proposed. In this embodiment, the water heater includes a combustion chamber and a fan arranged in the combustion chamber, referring to Figure 4 , after the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the method further includes:

[0113] Step S40, controlling the fan to run at a speed not greater than a preset speed to exhaust the smoke in the combustion chamber until the water heater starts heating.

[0114] The preset speed here is less than or equal to 50% of the maximum speed of the fan.

[0115] The operating speed of the fan during the process of stopping heating can be a preset fixed speed, or a speed determined according to the actual operating conditions of the water heater.

[0116] In this embodiment, the fan is controlled to run at a minimum speed. In other embodiments, the fan may also be controlled to run at a speed greater than the minimum speed and less than or equal to a preset speed.

[0117] After the water heater stops heating and before the water heater starts heating, the fan runs at a constant speed not greater than a preset speed.

[0118] It should be noted that step S40 here is executed synchronously with the above step S30.

[0119] In this embodiment, when the water heater stops heating, the fan is restricted to run at a low speed, which is beneficial to reducing the operating noise of the water heater.

[0120] In other embodiments, the temperature difference between the outlet water temperature and the set temperature at the initial moment when the water heater stops heating can be obtained, and the operating speed of the fan can be determined within a speed range not greater than a preset speed based on the temperature difference, and the fan can be controlled to operate at the determined operating speed. During the operation of the fan, the water temperature in the water path can be dissipated. The fan running at this speed is conducive to effectively reducing the outlet water temperature without dropping too fast, which can meet the user's comfort needs and will not restart the heating too quickly, so as to ensure that the operating noise is reduced, the user comfort is improved, and the operating stability of the water heater is improved.

[0121] In addition, an embodiment of the present invention further proposes a storage medium, on which a control program for a water heater is stored. When the control program for the water heater is executed by a processor, the relevant steps of any embodiment of the above water heater control method are implemented.

[0122] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0123] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0124] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, water heater, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0125] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for controlling a water heater, characterized in that: The control method of the water heater comprises the following steps: When the water heater is in a minimum load operation state, detecting the outlet water temperature of the water heater; When the outlet water temperature meets a first preset condition, the water heater is controlled to stop heating.

2. The water heater control method according to claim 1, characterized in that: The first preset condition includes that the outlet water temperature is greater than the set temperature of the water heater, and the temperature difference between the outlet water temperature and the set temperature is not less than a first temperature difference threshold.

3. The control method of the water heater according to claim 2, characterized in that: The first preset condition also includes that the change value corresponding to the outlet water temperature is less than a preset value.

4. The control method of the water heater according to claim 1, characterized in that: After the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the method further includes: When the outlet water temperature of the water heater drops to meet a second preset condition, the water heater is controlled to start heating.

5. The control method of the water heater according to claim 4, characterized in that: The second preset condition includes at least one of the following conditions: The current outlet water temperature of the water heater is greater than the set temperature of the water heater, and the temperature difference between the current outlet water temperature and the set temperature of the water heater is not greater than a second temperature difference threshold; The duration during which the water heater stops heating is not less than the target duration.

6. The control method of the water heater according to claim 5, characterized in that: The target duration is negatively correlated with the water inlet flow rate of the water heater.

7. The control method of the water heater according to claim 6, characterized in that: Before the step of controlling the water heater to start heating when the outlet water temperature of the water heater drops to meet the second preset condition, the step further includes: Obtaining the number of times the water heater stops heating in the minimum load operation state and / or the first outlet water temperature change value when the water heater stopped heating last time and / or the ambient temperature corresponding to the water heater; The second temperature difference threshold is determined according to the number of times and / or the first outlet water temperature change value and / or the ambient temperature.

8. The control method of the water heater according to claim 7, characterized in that: The step of determining the second temperature difference threshold according to the number of times and / or the first outlet water temperature change value and / or the ambient temperature comprises: Acquire a target correspondence between the number of times, the first outlet water temperature change value and the second temperature difference threshold value according to the ambient temperature; The second temperature difference threshold corresponding to the number of times and the first outlet water temperature change value is determined according to the target corresponding relationship.

9. The control method of the water heater according to claim 4, characterized in that: After the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the method further includes: The water heater is controlled to maintain a water inlet and outlet state, and the step of controlling the water heater to start heating is performed when the outlet water temperature of the water heater drops to meet a second preset condition.

10. The control method of the water heater according to claim 9, characterized in that: When the outlet water temperature of the water heater drops to meet the second preset condition, the step of controlling the water heater to start heating includes: When the outlet water temperature of the water heater drops to meet the second preset condition, obtaining the outlet water temperature change rate of the water heater after the water heater stops heating, and the temperature difference between the current outlet water temperature of the water heater and the set temperature of the water heater; adjusting the current water inlet flow rate of the water heater according to the temperature difference between the current outlet water temperature and the set temperature of the water heater and the rate of change of the outlet water temperature; The water heater is controlled to start heating.

11. The control method of the water heater according to claim 4, characterized in that: After the step of controlling the water heater to start heating, the method further includes: Return to the step of detecting the outlet water temperature of the water heater when the water heater is in the minimum load operation state.

12. The control method of a water heater according to any one of claims 1 to 11, characterized in that: The water heater comprises a combustion chamber and a fan arranged in the combustion chamber. After the step of controlling the water heater to stop heating when the outlet water temperature meets the first preset condition, the method further comprises: The fan is controlled to run at a speed not greater than a preset speed to exhaust smoke in the combustion chamber until the water heater starts heating.

13. A water heater, characterized in that: The water heater comprises: a memory, a processor and a control program of the water heater stored in the memory and executable on the processor. When the control program of the water heater is executed by the processor, the steps of the control method of the water heater as described in any one of claims 1 to 12 are implemented.

14. A storage medium, characterized in that: The storage medium stores a control program for the water heater, and when the control program for the water heater is executed by the processor, the steps of the control method for the water heater according to any one of claims 1 to 12 are implemented.

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