Constant temperature control method and control system of water heater

Abstract

The invention relates to the technical field of water heaters, and provides a constant-temperature control method and system of a water heater, a heating body is arranged at a water inlet pipe of the water heater, and the method comprises the steps that when the water heater is in a water-off state, the water inlet temperature of the water inlet pipe is obtained; judging whether the water inlet temperature meets a heating triggering condition or not; and if the water inlet temperature meets the heating triggering condition, the heating body is started to heat the water inlet pipe. According to the constant-temperature control method of the water heater, when the water heater is in the water-off state, cold water in the water inlet pipe can be preheated in advance, the water outlet degree of the water inlet pipe is improved, and therefore when a user opens a faucet again, it is ensured that flowing-out water is fully heated, and the user experience is improved. And therefore, the temperature drop generated when the water is boiled after the water heater is turned off can be avoided, and the bathing comfort of a user is improved.

Description

Technical Field

[0001] The present application relates to the field of water heaters, and in particular to a constant temperature control method and control system for water heaters. Background Art

[0002] There is generally a temperature drop problem when the water heater is turned off and then turned on again, which affects the user's bathing experience.

[0003] In order to solve the problem of temperature drop when turning off the water and then turning it on again, most water heaters on the market currently adopt the solution of speeding up the ignition speed. By optimizing the ignition control system, the time from detecting the change in water volume to ignition and combustion is shortened, thereby reducing the amount of unheated cold water flowing through.

[0004] However, this method can only reduce the amount of cold water flowing through to a certain extent, and cannot fundamentally increase the temperature of the cold water. Users will still feel a significant temperature difference. That is, although speeding up the ignition speed can alleviate the temperature drop to a certain extent, it fails to fundamentally solve the problem. Summary of the invention

[0005] The embodiments of the present application provide a constant temperature control method and control system for a water heater, aiming to solve the problem that the traditional solution of accelerating the ignition speed can only reduce the flow rate of cold water to a certain extent, but cannot fundamentally increase the temperature of the cold water.

[0006] In a first aspect, an embodiment of the present application provides a constant temperature control method for a water heater, wherein a heating element is provided at a water inlet pipe of the water heater, and the method comprises: When the water heater is in a water-off state, obtaining the water inlet temperature of the water inlet pipe; Determining whether the water inlet temperature meets the heating trigger condition; If the water inlet temperature meets the heating trigger condition, the heating element is started to heat the water inlet pipe.

[0007] In some embodiments, if the water inlet temperature meets the heating trigger condition, the heating element is started to heat the water inlet pipe, including: If the water inlet temperature satisfies the heating trigger condition, determining whether the water inlet temperature satisfies the first heating condition; If the water inlet temperature meets the first heating condition, one of the heating elements is started to heat the water inlet pipe.

[0008] In some embodiments, determining whether the water inlet temperature satisfies the first heating condition further includes: If the water inlet temperature does not meet the first heating condition, at least two of the heating elements are started to heat the water inlet pipe.

[0009] In some embodiments, determining whether the inlet water temperature satisfies a heating trigger condition includes: Determining whether the water inlet temperature is less than a first preset temperature value; If the inlet water temperature is lower than the first preset temperature value, it is determined that the inlet water temperature satisfies the heating trigger condition.

[0010] In some embodiments, determining whether the inlet water temperature satisfies the first heating condition includes: Determining whether the water inlet temperature is greater than a second preset temperature value; If the inlet water temperature is greater than a second preset temperature value, it is determined that the inlet water temperature meets the first heating condition.

[0011] In some embodiments, determining whether the water inlet temperature is greater than a second preset temperature value further includes: If the inlet water temperature is not greater than the second preset temperature value, it is determined that the inlet water temperature does not meet the first heating condition.

[0012] In some embodiments, determining whether the water inlet temperature satisfies a heating trigger condition, the method further includes: If the water inlet temperature does not meet the heating trigger condition, the heating element is not started to heat the water inlet pipe.

[0013] In some embodiments, after starting the heating element to heat the water inlet pipe, the method further includes: When the water heater is turned on again after being turned off, the water heater's water shut-off time is obtained; Determine whether the water shut-off time of the water heater is greater than a preset water shut-off threshold; If the water shut-off time of the water heater is not greater than the preset water shut-off threshold, the heating element is controlled to stop heating when a water flow signal is detected.

[0014] In some implementations, determining whether the water shutoff time of the water heater is greater than a preset water shutoff threshold value, the method further includes: If the water shut-off time of the water heater is greater than the preset water shut-off threshold, the heating element is controlled to stop heating within a preset time period.

[0015] In the second aspect, an embodiment of the present application also provides a constant temperature control system for a water heater, the constant temperature control system of the water heater includes a main controller and a water heater, the water heater includes a water tank, a heating element, a temperature sensor and a flow sensor, the heating element, the temperature sensor and the flow sensor are all arranged at the water inlet of the water heater, the main controller is arranged in the water heater and is electrically connected to the heating element, and the main controller is used to execute the steps of the above method.

[0016] The embodiment of the present application provides a constant temperature control method and control system for a water heater. The method includes: when the water heater is in a water-off state, obtaining the water inlet temperature of the water inlet pipe; judging whether the water inlet temperature meets the heating trigger condition; if the water inlet temperature meets the heating trigger condition, starting the heating element to heat the water inlet pipe.

[0017] In the embodiment of the present application, since a heating element is provided at the water inlet pipe of the water heater, when the water heater is in the water-off state, if it is determined that the water inlet temperature of the water inlet pipe meets the heating trigger condition, the heating element is directly started to heat the water inlet pipe, that is, the cold water in the water inlet pipe is preheated in advance to increase the water outlet degree of the water inlet pipe. In this way, when the user turns on the faucet again, it is ensured that the outflowing water has been sufficiently heated, thereby avoiding the temperature drop caused by turning off the water and then turning on the water in the water heater, thereby improving the bathing comfort of the user and improving the problem that the traditional solution of accelerating the ignition speed can only reduce the flow rate of cold water to a certain extent but cannot fundamentally increase the temperature of the cold water. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0021] Figure 1 A schematic structural diagram of a constant temperature control system for a water heater provided in an embodiment of the present application.

[0022] Figure 2 A schematic flow chart of a method for controlling a constant temperature of a water heater provided in an embodiment of the present application.

[0023] Figure 3 Another schematic flow chart of a method for controlling a constant temperature of a water heater provided in an embodiment of the present application.

[0024] Figure 4 A schematic diagram of the structure of a computer device provided in an embodiment of the present application.

[0025] Description of Figure Numbers: Water tank 1, main controller 2, heating element 3, temperature sensor 4, water flow sensor 5. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0028] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0029] It should also be understood that the terms used in this application specification are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in this application specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0030] It should be further understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0032] In traditional water heaters, if the user turns off the faucet and then turns it back on during bathing, there is a certain delay in this process because the main controller needs to detect the change in water volume and control the ignition and combustion. Therefore, when the faucet is turned on again, there will be a period of cold water that has not been heated yet flowing through the water heater, causing the water temperature to drop suddenly, affecting the user's bathing experience. This temperature fluctuation not only reduces the user's comfort, but may also cause unnecessary energy waste, especially when the water is turned on and off frequently.

[0033] In order to solve the problem of temperature drop when turning off the water and then turning it on again, most water heaters on the market currently adopt the solution of speeding up the ignition speed or using a segmented water valve.

[0034] The way to speed up the ignition speed is to optimize the ignition control system to shorten the time from detecting the change in water volume to ignition and combustion, thereby reducing the amount of unheated cold water flowing through. However, this method can only reduce the amount of cold water flowing through to a certain extent, and cannot fundamentally increase the temperature of the cold water. Users will still feel a significant temperature difference. In addition, speeding up the ignition speed may increase the complexity and maintenance costs of the system, and cannot completely eliminate the temperature drop phenomenon.

[0035] The way of segmented water valve is to use a small amount of water first and then a large amount of water after turning off the water and then turning it on again, so that the temperature rises quickly. Specifically, when the user turns off the water and then turns it on again, the system will first supply water in a small amount to ensure that the water temperature can rise quickly, and then gradually switch to a large amount of water to meet the user's water demand. Among them, in order to prevent temperature overshoot, a bypass line needs to be added to adjust the water temperature and flow rate. Although this solution can improve the temperature drop problem to a certain extent, this method requires segmented water valves and water tanks to add bypass pipes, which requires more cost.

[0036] In order to solve the above technical problems in the prior art, the present application provides a constant temperature control method and control system for a water heater, which can solve the temperature drop problem when the water heater is turned on again after the water is turned off.

[0037] See also Figure 1The present application provides a constant temperature control system for a water heater, the constant temperature control system for the water heater comprises a main controller 2 and a water heater, the water heater comprises a water tank 1, a heating element 3, a temperature sensor 4 and a flow sensor, the heating element 3, the temperature sensor 4 and the flow sensor are all arranged at the water inlet of the water heater, the main controller 2 is arranged in the water heater, and is electrically connected to the heating element 3, the main controller 2 is used to execute the steps of the method described in the following embodiments.

[0038] The heating element 3 is connected to the main controller 2 and is controlled independently by the main controller 2 .

[0039] In some embodiments, the heating element 3 may be an antifreeze heating element 3. In addition, the number and power of the heating elements 3 may be reasonably configured according to the diameter of the water pipe of the water tank 1.

[0040] See also Figure 2 , Figure 2 This is a flow chart of a first embodiment of a constant temperature control method for a water heater provided in the present application, the method comprising: Step 110: When the water heater is in a water-off state, the water inlet temperature of the water inlet pipe is obtained.

[0041] Step 120: Determine whether the inlet water temperature satisfies a heating trigger condition.

[0042] Step 130: If the water inlet temperature meets the heating trigger condition, the heating element is started to heat the water inlet pipe.

[0043] In this embodiment, since a heating element is provided at the water inlet pipe of the water heater, when the water heater is in the water-off state, if it is determined that the water inlet temperature of the water inlet pipe meets the heating trigger condition, the heating element is directly started to heat the water inlet pipe, that is, the cold water in the water inlet pipe is preheated in advance. In this way, when the user turns on the faucet again, it is ensured that the outflowing water has been sufficiently heated, thereby avoiding the temperature drop caused by turning off the water and then turning on the water in the water heater, thereby improving the bathing comfort of the user and improving the problem that the traditional solution of accelerating the ignition speed can only reduce the flow rate of cold water to a certain extent but cannot fundamentally increase the temperature of the cold water.

[0044] In addition, since the heating element is basically a standard feature of the water heater, there is no need to incur additional costs by using the heating element to heat the water inlet pipe.

[0045] In some embodiments, step 120, i.e., determining whether the inlet water temperature satisfies a heating trigger condition, includes: Step 121: Determine whether the water inlet temperature is less than a first preset temperature value.

[0046] The water inlet temperature can be detected and obtained by a temperature sensor at the water inlet pipe.

[0047] Step 122: If the water inlet temperature is less than the first preset temperature value, it is determined that the water inlet temperature meets the heating trigger condition.

[0048] In some embodiments, if the water inlet temperature does not meet the heating trigger condition, the heating element is not activated to heat the water inlet pipe.

[0049] For example, if the water inlet temperature is greater than the first preset temperature value, it is determined that the water inlet temperature does not meet the heating trigger condition, and the heating element is not started to heat the water inlet pipe.

[0050] In some embodiments, the first preset temperature value may be 28-32°C.

[0051] That is, when the inlet water temperature is lower than 28~32℃, it means that the heating element needs to be started for heating. When the inlet water temperature is higher than 28~32℃, it means that the water temperature will not be too low when the water heater is turned off and then turned on again. In order to avoid excessive water temperature and save electricity, the heating element will no longer be turned on for heating.

[0052] That is, when the water heater is in the water-off state, if the detected water inlet temperature does not meet the heating trigger condition, the heating element will not be started to heat the water inlet pipe. In this way, the heating cost can be reduced, and the problem of poor user experience caused by over-hot water temperature provided to users can be avoided.

[0053] In some implementations, the number of the heating elements may be multiple. Referring to the second embodiment of a constant temperature control method for a water heater provided in the present application, the method includes: Step 210: When the water heater is in a water-off state, the water inlet temperature of the water inlet pipe is obtained.

[0054] Step 220: Determine whether the inlet water temperature satisfies a heating trigger condition.

[0055] Step 230: If the inlet water temperature satisfies the heating trigger condition, determine whether the inlet water temperature satisfies the first heating condition.

[0056] Step 240: If the inlet water temperature meets the first heating condition, start one of the heating elements to heat the inlet water pipe.

[0057] Referring to the third embodiment of a constant temperature control method for a water heater provided in the present application, the method comprises: Step 310: When the water heater is in a water-off state, the water inlet temperature of the water inlet pipe is obtained.

[0058] Step 320: Determine whether the inlet water temperature satisfies a heating trigger condition.

[0059] Step 330: If the inlet water temperature satisfies the heating trigger condition, determine whether the inlet water temperature satisfies the first heating condition.

[0060] Step 340: If the water inlet temperature satisfies the first heating condition, one of the heating elements is started to heat the water inlet pipe.

[0061] Step 350: If the water inlet temperature does not meet the first heating condition, start at least two of the heating elements to heat the water inlet pipe.

[0062] Since there are multiple heating elements, after determining that the heating trigger condition is met, it is possible to further determine whether the inlet water temperature meets the first heating condition, so as to control the number of heating elements started according to the temperature, thereby reasonably heating and saving electricity.

[0063] In some embodiments, determining whether the water inlet temperature satisfies the first heating condition in step 230 includes: Step 231: Determine whether the inlet water temperature is greater than a second preset temperature value.

[0064] Step 232: If the inlet water temperature is greater than the second preset temperature value, it is determined that the inlet water temperature meets the first heating condition.

[0065] Step 233: If the inlet water temperature is not greater than the second preset temperature value, it is determined that the inlet water temperature does not meet the first heating condition.

[0066] In some embodiments, the second preset temperature value may be 5-10°C. When the water inlet temperature is higher than 5-10°C and lower than 28-32°C, it indicates that the temperature is moderate and a heating element may be activated to heat the water inlet pipe.

[0067] When the inlet water temperature is lower than 5-10℃, it means the temperature is low. At this time, the temperature drop will be obvious after turning off the water and restarting it. Therefore, it is necessary to start more than 2 heating elements to quickly heat the water inlet pipe.

[0068] Referring to the fourth embodiment of a constant temperature control method for a water heater provided by the present application, the method comprises: Step 410: When the water heater is in a water-off state, the water inlet temperature of the water inlet pipe is obtained.

[0069] Step 420: Determine whether the inlet water temperature satisfies a heating trigger condition.

[0070] Step 430: If the water inlet temperature meets the heating trigger condition, the heating element is started to heat the water inlet pipe.

[0071] Step 440: When the water heater is turned on again after being turned off, the water shutoff time of the water heater is obtained.

[0072] Step 450: Determine whether the water shut-off time of the water heater is greater than a preset water shut-off threshold.

[0073] Step 460: If the water shut-off time of the water heater is not greater than the preset water shut-off threshold, then when a water flow signal is detected, the heating element is controlled to stop heating.

[0074] In some implementations, determining whether the water shutoff time of the water heater is greater than a preset water shutoff threshold value, the method further includes: Step 470: If the water shut-off time of the water heater is greater than the preset water shut-off threshold, the heating element is controlled to stop heating within a preset time period.

[0075] Among them, the preset water-off threshold refers to the interval time between turning off the water and then turning it on again, which can be 60s~90s. The preset time period can also be 60s~90s. The interval time is mainly the time it takes for the user to apply shampoo, facial cleanser, shower gel, etc.

[0076] Assuming that 60s is the dividing line, in actual use, if the user's water-off interval is less than 60s, when the water heater turns on, the heating element is directly controlled to stop working.

[0077] If the water shut-off time is greater than 60 seconds, the user may have finished bathing. To avoid wasting electricity, the heating element is controlled to shut down after heating for 60 seconds to 90 seconds.

[0078] In this way, when the water in the water heater is turned off, the heating element is controlled to heat the water inlet pipe according to the inlet water temperature. When the water heater is turned on again, the heating element is controlled to stop working according to the water shut-off time. This ensures that during the water shut-off period, the heating element can preheat the cold water at the water inlet pipe, increase the water output of the water inlet pipe, avoid a period of low-temperature cold water when the water is turned off and then on, and improve the user's bathing experience.

[0079] Based on the above embodiments, see Figure 3 The constant temperature control method of the water heater provided in this application mainly includes the following process: Step 11: The water heater is functioning properly.

[0080] Step 12: The antifreeze heating element does not work.

[0081] Step 13: Turn off the water to the water heater.

[0082] Step 14: The main controller monitors the water inlet probe temperature T.

[0083] Among them, the water inlet probe is a temperature sensor.

[0084] Step 15: When the inlet water temperature is higher than TI, the antifreeze heating element is not activated to heat the water inlet pipe.

[0085] Step 16: When the current inlet water temperature is higher than T2 and lower than TI, the main controller starts an antifreeze heating element to heat the water inlet pipe.

[0086] Step 17: When the current inlet water temperature is lower than T2, the main controller starts more than two antifreeze heating elements to heat the water inlet pipe.

[0087] Among them, TI is the first preset temperature value, T2 is the second preset temperature value, TI can be 28~32℃, and T2 can be 5-10℃.

[0088] Step 18: Turn off the water in the water heater and turn it on again.

[0089] Step 19: The main controller records the water shut-off time P.

[0090] If the water shut-off time is below P1, execute step 20; if the water shut-off time is above P1, execute step 21.

[0091] Among them, P1 is the preset water shut-off threshold, which can be 60s~90s.

[0092] Step 20: After the water heater starts to boil water again, the main controller detects the water flow signal and controls the antifreeze heating element to stop heating.

[0093] Step 21: The main controller controls the antifreeze heating element to heat and stops heating after a specific time.

[0094] The specific time is a preset time period, which can be 60s~90s.

[0095] That is, when the water heater is turned off, the main controller will first detect the inlet water temperature. If the current inlet water temperature is higher than T1, in order to avoid the outlet water temperature being too high, the main controller will not start the antifreeze heating element to heat the water inlet pipe.

[0096] When the inlet water temperature is lower than T1, it means that the antifreeze heater needs to be started to heat the water inlet pipe. Since there are multiple antifreeze heaters, the relationship between the current inlet water temperature and T2 can be further judged. When the inlet water temperature is lower than T1 and higher than T2, one antifreeze heater is controlled to heat the water inlet pipe; when the inlet water temperature is lower than T2, two or more antifreeze heaters are controlled to heat the water inlet pipe. That is, by controlling the number of antifreeze heaters heated by temperature, the water inlet pipe can be heated reasonably to save electricity.

[0097] In addition, when the water heater is turned off, the main controller will record the water-off time. If the water-off time does not exceed P1, when the water is turned on again, the main controller detects the water volume signal transmitted by the water flow sensor and controls the antifreeze heating element to stop working. If the water-off time exceeds P1, the main controller controls the antifreeze heating element to turn off at a specific time.

[0098] In this way, when the water heater is turned off and then turned on again, the antifreeze heating element can preheat the water inlet pipe in advance, thus avoiding excessive drop in water temperature when the water is turned on again, thereby improving the user's bathing experience.

[0099] Corresponding to the above constant temperature control method for a water heater, the present application also provides a constant temperature control device for a water heater. The constant temperature control method for a water heater includes a unit for executing the above constant temperature control method for a water heater, and the constant temperature control device for a water heater can be configured in a desktop computer, a tablet computer, a laptop, or other terminals.

[0100] like Figure 4 As shown, the embodiment of the present application provides a computer device, including a processor 111, a communication interface 112, a memory 113 and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114. Memory 113, used for storing computer programs; In one embodiment of the present application, the processor 111 is used to execute the program stored in the memory 113 to implement the constant temperature control method of the water heater provided by any of the above method embodiments, including: When the water heater is in a water-off state, obtaining the water inlet temperature of the water inlet pipe; Determining whether the water inlet temperature meets the heating trigger condition; If the water inlet temperature meets the heating trigger condition, the heating element is started to heat the water inlet pipe.

[0101] It is understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a storage medium, which is a computer-readable storage medium. The computer program is executed by at least one processor in the computer system to implement the process steps of the embodiment of the above method.

[0102] Therefore, an embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the steps of the constant temperature control method for a water heater provided in any of the above method embodiments are implemented, including: When the water heater is in a water-off state, obtaining the water inlet temperature of the water inlet pipe; Determining whether the water inlet temperature meets the heating trigger condition; If the water inlet temperature meets the heating trigger condition, the heating element is started to heat the water inlet pipe.

[0103] The storage medium is a physical, non-transient storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which can store program codes. The computer-readable storage medium can be non-volatile or volatile.

[0104] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0105] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of each unit is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0106] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs. The units in the device of the embodiment of the present application can be combined, divided and deleted according to actual needs. In addition, the functional units in the various embodiments of the present application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0107] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, terminal, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application.

[0108] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0109] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0110] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A constant temperature control method for a water heater, characterized in that: A heating element is provided at the water inlet pipe of the water heater, and the method comprises: When the water heater is in a water-off state, obtaining the water inlet temperature of the water inlet pipe; Determining whether the water inlet temperature meets the heating trigger condition; If the water inlet temperature meets the heating trigger condition, the heating element is started to heat the water inlet pipe.

2. The method according to claim 1, characterized in that: If the water inlet temperature meets the heating trigger condition, the heating element is started to heat the water inlet pipe, including: If the water inlet temperature satisfies the heating trigger condition, determining whether the water inlet temperature satisfies the first heating condition; If the water inlet temperature meets the first heating condition, one of the heating elements is started to heat the water inlet pipe.

3. The method according to claim 2, characterized in that Determining whether the water inlet temperature satisfies the first heating condition further includes: If the water inlet temperature does not meet the first heating condition, at least two of the heating elements are started to heat the water inlet pipe.

4. The method according to claim 1, characterized in that: Determining whether the water inlet temperature meets the heating trigger condition includes: Determining whether the water inlet temperature is less than a first preset temperature value; If the inlet water temperature is lower than the first preset temperature value, it is determined that the inlet water temperature satisfies the heating trigger condition.

5. The method according to claim 2, characterized in that: Determining whether the water inlet temperature satisfies a first heating condition includes: Determining whether the water inlet temperature is greater than a second preset temperature value; If the inlet water temperature is greater than a second preset temperature value, it is determined that the inlet water temperature meets the first heating condition.

6. The method according to claim 5, characterized in that Determining whether the water inlet temperature is greater than a second preset temperature value further includes: If the inlet water temperature is not greater than the second preset temperature value, it is determined that the inlet water temperature does not meet the first heating condition.

7. The method according to claim 1, characterized in that Determining whether the water inlet temperature meets a heating trigger condition, the method further includes: If the water inlet temperature does not meet the heating trigger condition, the heating element is not started to heat the water inlet pipe.

8. The method according to claim 1, characterized in that After starting the heating element to heat the water inlet pipe, the method further includes: When the water heater is turned on again after being turned off, the water heater's water shut-off time is obtained; Determine whether the water shut-off time of the water heater is greater than a preset water shut-off threshold; If the water shut-off time of the water heater is not greater than the preset water shut-off threshold, the heating element is controlled to stop heating when a water flow signal is detected.

9. The method according to claim 8, characterized in that Determining whether the water shut-off time of the water heater is greater than a preset water shut-off threshold, the method further includes: If the water shut-off time of the water heater is greater than the preset water shut-off threshold, the heating element is controlled to stop heating within a preset time period.

10. A constant temperature control system for a water heater, characterized in that: The constant temperature control system of the water heater includes a main controller and a water heater, wherein the water heater includes a water tank, a heating element, a temperature sensor and a flow sensor, wherein the heating element, the temperature sensor and the flow sensor are all arranged at the water inlet of the water heater, and the main controller is arranged at the water heater and electrically connected to the heating element, and the main controller is used to execute the steps of the method as described in any one of claims 1 to 9.

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