Temperature control method and system of water heater

Abstract

The invention relates to the technical field of water heaters, and provides a temperature control method and system for a water heater. The method comprises the steps that initial temperature information of the water heater after the water heater enters a normal working state is obtained; pre-adjusting the position of the thermostatic valve to a first preset position based on the initial temperature information; when the water flow is larger than or equal to a preset water flow threshold value, whether the initial temperature information meets a first preset triggering requirement or not is judged; if the initial temperature information does not meet the first preset triggering requirement, the over-current heater is controlled to be in a starting working state; the theoretical water outlet temperature of the overflowing type heater in the starting working state is obtained; determining a target position of the thermostatic valve from a preset outlet water temperature-thermostatic valve position mapping table based on the theoretical outlet water temperature; and the thermostatic valve is adjusted to the target position from the first preset position. The constant temperature adjusting efficiency of the water heater can be improved.

Description

Technical Field

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

[0002] With the increasing demand for hot water in the market, especially the demand for constant temperature hot water, constant temperature electric water heaters have gradually become mainstream products. Constant temperature electric water heaters are a type of water heater that can automatically adjust the outlet water temperature during user use to ensure that it always remains within the set target temperature range. Compared with traditional electric water heaters, constant temperature electric water heaters can not only provide hot water, but also monitor and adjust the water temperature in real time through the built-in constant temperature control system to avoid unstable water temperature caused by factors such as changes in water flow and fluctuations in water inlet temperature. This type of water heater is widely used in homes, hotels, hospitals and other places, providing users with a more comfortable and stable hot water experience.

[0003] In existing thermostatic electric water heaters, the thermostatic control logic is relatively simple, and usually a fixed program based on preset parameters is used for thermostatic adjustment. Specifically, when the user starts to use water, the system will gradually adjust the position of the thermostatic valve according to the pre-set water temperature and flow parameters to achieve the target temperature.

[0004] However, since the existing thermostatic adjustment process is carried out step by step, it takes a long time for the system to stabilize the outlet water temperature at the target temperature. Especially when the water flow is large or the inlet water temperature is low, the system may need to adjust multiple times to reach the ideal water temperature, causing users to wait for a long time. Summary of the invention

[0005] The embodiments of the present application provide a temperature control method and system for a water heater, aiming to solve the technical problem of slow constant temperature adjustment of existing water heaters.

[0006] In a first aspect, an embodiment of the present application provides a temperature control method for a water heater, wherein the water heater includes a thermostatic valve and an over-flow heater, and the method includes: Obtain the initial temperature information of the water heater after it enters normal working state; Based on the initial temperature information, pre-adjusting the position of the thermostatic valve to a first preset position; When the water flow rate is greater than or equal to a preset water flow rate threshold, determining whether the initial temperature information meets a first preset trigger requirement; If the initial temperature information does not meet the first preset trigger requirement, the over-flow heater is controlled to be in a startup working state; the theoretical outlet water temperature when the over-flow heater is in the startup working state is obtained; Based on the theoretical water outlet temperature, determining the target position of the thermostatic valve from a preset water outlet temperature-thermostatic valve position mapping table; Adjust the thermostatic valve from the first preset position to the target position.

[0007] In some embodiments, obtaining the theoretical outlet water temperature when the over-flow heater is in a startup working state includes: Obtain the standard temperature rise value of the overflow heater, as well as the actual water flow and actual voltage when the overflow heater is in the starting working state; Based on the actual water flow and the actual voltage, the actual temperature rise value of the over-flow heater is obtained; Determine the temperature rise difference between the actual temperature rise value and the standard temperature rise value; Based on the temperature rise difference, the theoretical outlet water temperature of the over-flow heater when it is in the starting working state is obtained.

[0008] In some embodiments, the initial temperature information includes the water inlet temperature and the energy storage temperature. If the initial temperature information meets the first preset trigger requirement, the over-flow heater is controlled to be in a start-up working state, including: If the water inlet temperature and the energy storage temperature meet the first preset trigger requirement, then after the first delay time period, the over-flow heater is controlled to be in a start-up working state.

[0009] In some embodiments, the initial temperature information includes the water inlet temperature and the energy storage temperature, and determining whether the initial temperature information meets the first preset trigger requirement includes: Determine whether the water inlet temperature is greater than a first threshold, and whether the energy storage temperature is greater than a second threshold, wherein the second threshold is greater than the first threshold; If the water inlet temperature is not greater than the first threshold and / or the energy storage temperature is not greater than the second threshold, it is determined that the initial temperature information does not meet the first preset trigger requirement.

[0010] In some embodiments, after adjusting the thermostatic valve from the first preset position to the target position, the method further includes: Get the actual outlet water temperature when the over-flow heater is in the starting working state; Determine whether the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference; If the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference, the thermostatic valve is adjusted from the target position to the actual target position corresponding to the actual outlet water temperature.

[0011] In some embodiments, if the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference, adjusting the thermostatic valve from the target position to the actual target position corresponding to the actual outlet water temperature includes: If the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference, then after the second delay period, the thermostatic valve is adjusted from the target position to the actual target position corresponding to the actual outlet water temperature.

[0012] In some implementations, obtaining a standard temperature rise value of an over-flow heater includes: Obtain the power of the over-flow heater and the water flow rate of the over-flow heater per unit time; Based on the power of the overflow heater, the water flow rate of the overflow heater per unit time and the specific heat capacity of water, the standard temperature rise value of the overflow heater is obtained.

[0013] In some embodiments, determining whether the initial temperature information meets the first preset trigger requirement, the method further includes: If the initial temperature information meets the first preset trigger requirement, the energy storage heater is controlled to be in a start-up working state after a first delay period; Obtain the actual outlet water temperature when the energy storage heater is in the starting working state; Determine whether the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference; If the temperature difference between the actual water outlet temperature and the preset water outlet temperature is greater than the preset temperature difference, the thermostatic valve is adjusted from the first preset position to the actual target position corresponding to the actual water outlet temperature.

[0014] In some embodiments, after pre-adjusting the position of the thermostatic valve to the first preset position, the method further comprises: When the water flow rate does not meet the preset water flow rate threshold, determining whether the temperature difference between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference value; If the temperature difference between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference, the energy storage heater is controlled to be in a start-up working state.

[0015] In a second aspect, an embodiment of the present application further provides a temperature control system for a water heater, the temperature control system comprising: a water heater and a controller, wherein the controller is used to perform the steps of the above method; The water heater includes an energy storage tank, a heat exchanger, an energy storage heater, an over-flow heater, a thermostatic valve, a water flow sensor, a first temperature sensor, a second temperature sensor and a third temperature sensor; Wherein, the energy storage heater is arranged in the energy storage box; The heat exchanger and the second temperature sensor are arranged in the energy storage box; The thermostatic valve is connected to the outlet of the heat exchanger, the water inlet of the water heater and the overflow heater; The over-flow heater is connected to the water outlet of the water heater; The inlet of the heat exchanger is connected to the water inlet of the water heater; The first temperature sensor and the third temperature sensor are respectively located at the water inlet and the water outlet of the water heater.

[0016] The embodiment of the present application provides a temperature control method and system for a water heater. The method provided by the embodiment of the present application includes: after the water heater enters a normal working state, the thermostatic valve is pre-adjusted to a first preset position, and when it is determined that the user uses water (that is, the water flow rate is greater than or equal to the preset water flow rate threshold) and the initial temperature information meets the first preset trigger requirement, the over-flow heater is controlled to be in a start-up working state, and by obtaining the theoretical outlet water temperature when the over-flow heater is in the start-up working state, the target position of the thermostatic valve is determined from a preset outlet water temperature-thermostatic valve position mapping table, and the thermostatic valve is adjusted from the first preset position to the target position.

[0017] Since the water outlet temperature-thermostatic valve position mapping table is preset and covers the correspondence between the water outlet temperature and the thermostatic valve position under different working conditions, after obtaining the theoretical water outlet temperature when the over-flow heater is in the startup working state, the present application can quickly find the target position of the thermostatic valve by looking up the water outlet temperature-thermostatic valve position mapping table, and directly adjust the thermostatic valve from the first preset position to the target position without complex calculations or step-by-step adjustments, thereby improving the efficiency of the constant temperature regulation of the water heater. 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 diagram of the structure of a water heater provided in an embodiment of the present application.

[0022] Figure 2 This is a schematic flow chart of the first embodiment of the temperature control method for a water heater provided in the present application.

[0023] Figure 3 A schematic diagram of the structure of a computer device provided in an embodiment of the present application.

[0024] Description of the accompanying drawings: water heater 10, energy storage box 100, heat exchanger 101, energy storage heater 102, overflow heater 103, thermostatic valve 104, water flow sensor 105, first temperature sensor 106, second temperature sensor 107, third temperature sensor 108, energy storage medium 109, water inlet 201, water outlet 202. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] In order to solve the technical problem in the prior art that the existing constant temperature adjustment process is carried out step by step, resulting in the system taking a long time to stabilize the outlet water temperature at the target temperature, the present application provides a temperature control method for a water heater, which can improve the efficiency of the constant temperature adjustment of the water heater.

[0032] The present application provides a temperature control system for a water heater, the temperature control system comprising: a water heater and a controller, wherein the controller is used to execute the method steps of the following embodiments.

[0033] like Figure 1 As shown, the water heater 10 provided in the present application includes an energy storage tank 100, a heat exchanger 101, an energy storage heater 102, an overflow heater 103, a thermostatic valve 104, a water flow sensor 105, a first temperature sensor 106, a second temperature sensor 107 and a third temperature sensor 108.

[0034] Among them, the energy storage box 100 is used to store energy storage materials, such as water, phase change materials, or a mixture of water and phase change materials. The temperature increase and decrease of the energy storage medium 109 are used to realize energy storage and energy release. When cold water flows through the heat exchanger 101, it can take away the heat of the energy storage medium 109 to increase the water temperature of the cold water flowing through it and realize heat exchange.

[0035] The energy storage heater 102 is disposed in the energy storage box 100 and is used to heat the energy storage medium 109 in the energy storage box 100 for energy storage.

[0036] The heat exchanger 101 and the second temperature sensor 107 are arranged in the energy storage box. The inside of the heat exchanger 101 is bathing water, and the outside of the heat exchanger 101 is energy storage medium 109. The second temperature sensor 107 is used to feedback the temperature of the energy storage medium 109 in the energy storage box 100.

[0037] The thermostatic valve 104 is connected to the outlet of the heat exchanger 101, the water inlet 201 of the water heater 10, and the overflow heater 103, and is used to mix the hot water for bathing outputted from the heat exchanger 101 and the cold water of the water inlet 201 branch to achieve the required water temperature.

[0038] The overflow heater 103 is connected to the water outlet 202 of the water heater 10 and is used for secondary heating the constant temperature water output from the thermostatic valve 104 to reach the bathing water temperature.

[0039] The inlet of the heat exchanger 101 is in communication with the water inlet 201 of the water heater 10; The first temperature sensor 106 and the water flow sensor 105 are located at the water inlet 201 of the water heater 10 . The first temperature sensor 106 is used to detect the inlet water temperature, and the water flow sensor 105 is used to detect the inlet water flow rate.

[0040] The third temperature sensor 108 is located at the water outlet 202 of the water heater 10 and is used to detect the water temperature at the water outlet 202 , ie, the outlet water temperature.

[0041] Based on the above water heater temperature control system, the present application provides a first embodiment of a water heater temperature control method, referring to Figure 2 , the method comprises the following steps: Step 110: Acquire initial temperature information after the water heater enters a normal working state.

[0042] Step 120: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to a first preset position.

[0043] Step 130: When the water flow rate is greater than or equal to the preset water flow rate threshold, determine whether the initial temperature information meets the first preset trigger requirement.

[0044] Step 140: If the initial temperature information meets the first preset trigger requirement, the over-current heater is controlled to be in a start-up working state.

[0045] Step 150: Obtain the theoretical outlet water temperature when the over-flow heater is in the startup working state.

[0046] Step 160: Based on the theoretical outlet water temperature, determine the target position of the thermostatic valve from a preset outlet water temperature-thermostatic valve position mapping table.

[0047] Step 170: Adjust the thermostatic valve from the first preset position to the target position.

[0048] Since the water outlet temperature-thermostatic valve position mapping table is preset and covers the correspondence between the water outlet temperature and the thermostatic valve position under different working conditions, after obtaining the theoretical water outlet temperature when the over-flow heater is in the startup working state, this embodiment can quickly find the target position of the thermostatic valve by looking up the water outlet temperature-thermostatic valve position mapping table, and directly adjust the thermostatic valve from the first preset position to the target position without complex calculations or step-by-step adjustments, thereby improving the efficiency of the constant temperature adjustment of the water heater.

[0049] In some embodiments, step 150, i.e. obtaining the theoretical outlet water temperature when the over-flow heater is in the startup working state, comprises the following steps: Step 151: Obtain the standard temperature rise value of the overflow heater, and the actual water flow and actual voltage when the overflow heater is in the startup working state.

[0050] Among them, the standard temperature rise value of the over-flow heater can be obtained as follows: 1) Obtain the power of the over-flow heater and the water flow rate of the over-flow heater per unit time; 2) Based on the power of the overflow heater, the water flow rate of the overflow heater per unit time and the specific heat capacity of water, the standard temperature rise value of the overflow heater is obtained.

[0051] In some embodiments, without considering the conversion efficiency, the standard temperature rise value can be calculated using the following formula 1: , Formula 1.

[0052] Where P*t represents the electrical energy generated; Represents the temperature energy change caused by the temperature rise generated by the electric energy; P represents the rated power of the over-flow heater; t represents the unit time, for example, it can be 1min; C represents the specific heat capacity of water, 4.2*10³ J / (kg·℃); M represents the mass of water flowing through the over-flow heater per unit time, which is equivalent to the water flow rate of the over-flow heater per unit time, which can be read by the water flow sensor at the water inlet; It represents the temperature rise value that the over-current heater can bring under standard conditions, namely the standard temperature rise value.

[0053] Step 152: Based on the actual water flow and the actual voltage, obtain the actual temperature rise value of the over-flow heater.

[0054] The above formula 1 can be understood as the output power converted into the temperature rise value of unit water. P is the rated power, which can be converted into the relationship between voltage and resistance U*U / R. That is, formula 1 can be converted into the following formula 2: , Formula 2.

[0055] Among them, U is the voltage, which can be read in real time by the controller, and Q is the water flow rate of the over-flow heater per unit time, which can be read by the water flow sensor at the water inlet. In the actual water use process, U and Q are both variable values.

[0056] For example, at time t1, the measured voltage is U1 and the water flow is Q1, then the actual temperature rise value at that time can be calculated accordingly .

[0057] Step 153: Determine the temperature rise difference between the actual temperature rise value and the standard temperature rise value.

[0058] Temperature rise difference .

[0059] Step 154: Based on the temperature rise difference, obtain the theoretical outlet water temperature when the over-flow heater is in the startup working state.

[0060] Assume that the preset water outlet temperature-thermostatic valve position mapping table may include the following Tables 1-3.

[0061] Table 1

[0062] Table 2

[0063] Table 3

[0064] Among them, Tables 1 to 3 are sampling tables, which collect sampling tables of different outlet water temperatures corresponding to different inlet water temperatures, different energy storage temperatures, standard voltages U, and standard flow rates Q in advance. The positions A1 / A2 / A3 of the thermostatic valve cores in Tables 1 to 3 are obtained by sampling or calculation.

[0065] Among them, the standard voltage can be 220V and the standard flow rate can be 5L / min.

[0066] Referring to Tables 1 to 3 above, if the position of the thermostatic valve is pre-adjusted to the first preset position, which is position A103 in Table 1, based on the initial temperature information, then the temperature rise difference is calculated. (for example greater than 0), the theoretical outlet water temperature can be obtained as the outlet water temperature , that is, find Table 2, and find the target position A203 from Table 2.

[0067] in, The value may be rounded to the nearest integer, for example, 1, 2, 3, 4, etc.

[0068] Referring to the second embodiment of the temperature control method of the water heater provided in the present application, the method includes: Step 210: Acquire initial temperature information after the water heater enters a normal working state.

[0069] Step 220: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to a first preset position.

[0070] Step 230: When the water flow rate is greater than or equal to the preset water flow rate threshold, determine whether the initial temperature information meets the first preset trigger requirement.

[0071] The preset water flow threshold Q0 may be set to 2.5 L / min. If the water flow is greater than or equal to the preset water flow threshold, it may indicate that the user is using water.

[0072] Among them, the initial temperature information includes the current water inlet temperature, energy storage temperature and preset water outlet temperature.

[0073] Step 240: If the water inlet temperature and the energy storage temperature meet the first preset trigger requirement, then after the first delay period, the over-flow heater is controlled to be in a start-up working state.

[0074] During the energy storage heating process of a general water heater, due to heat transfer, the heat of the energy storage medium in the energy storage box will be transferred along with the connected pipes, causing the water temperature of the connected pipes to rise. When water is used, the water in this section of the pipe will be discharged first. If this section of hot water passes through the overflow heater while the overflow heater is turned on, the temperature of this section of hot water will rise again, and when it reaches the water outlet, it is easy to scald the user. Therefore, before starting the overflow heater, a delay time period, namely the first delay time period t1, is added to wait until this section of hot water flows through the overflow heater before starting the overflow heater, thereby avoiding the water temperature at the water outlet being too high and scalding the user.

[0075] The value of the first time period t1 depends on the volume of water in the waterway and the current water flow rate, and is generally set to 3 to 8 seconds.

[0076] Step 250: Obtain the theoretical outlet water temperature of the over-flow heater when it is in the startup working state.

[0077] Step 260: Based on the theoretical outlet water temperature, determine the target position of the thermostatic valve from a preset outlet water temperature-thermostatic valve position mapping table.

[0078] Step 270: Adjust the thermostatic valve from the first preset position to the target position.

[0079] In some implementations, if the initial temperature information does not meet the first preset trigger requirement, the following steps are performed: Step 241: If the initial temperature information meets the first preset trigger requirement, the energy storage heater is controlled to be in a start-up working state after a first delay period.

[0080] Among them, the initial temperature information meets the first preset trigger requirement, indicating that the water inlet temperature is too high, and the energy storage temperature meets the bathing conditions with hot water, then the overflow heater will not be started, but in order to ensure sufficient hot water, the energy storage heater can be started for continuous heating.

[0081] In addition, the first time period t1 is delayed to allow the water in the original water path to be discharged first, so as to avoid the superposition of the temperature rise after the energy storage heater is started, resulting in over-temperature of the outlet water.

[0082] The value of the first time period t1 depends on the volume of water in the waterway and the current water flow rate, and is generally set to 3 to 8 seconds.

[0083] Step 251: Obtain the actual outlet water temperature when the energy storage heater is in the startup working state.

[0084] Step 261: Determine whether the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference.

[0085] Step 271: If the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference, the thermostatic valve is adjusted from the first preset position to the actual target position corresponding to the actual outlet water temperature.

[0086] In some embodiments, the initial temperature information includes the water inlet temperature and the energy storage temperature. Referring to the third embodiment of the temperature control method of the water heater provided in the present application, the method includes: Step 310: Acquire initial temperature information after the water heater enters a normal working state.

[0087] Step 320: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to a first preset position.

[0088] Step 330: When the water flow rate is greater than or equal to the preset water flow rate threshold, determine whether the water inlet temperature is greater than a first threshold, and whether the energy storage temperature is greater than a second threshold.

[0089] Among them, the second threshold is greater than the first threshold. The first threshold depends on the power of the over-current heater and is generally set to 23~35°C; the second threshold depends on the minimum energy storage temperature of the energy storage box that meets the requirements for bathing, and is generally set to 40~55°C.

[0090] Step 340: If the water inlet temperature is not greater than the first threshold and / or the energy storage temperature is not greater than the second threshold, it is determined that the initial temperature information does not meet the first preset trigger requirement, and the over-flow heater is controlled to be in the start-up working state.

[0091] That is to say, if the inlet water temperature is lower than the first threshold value and the energy storage temperature is higher than the second threshold value, the over-flow heater is started.

[0092] If the inlet water temperature is greater than the first threshold and the energy storage temperature is less than the second threshold, the over-flow heater is started.

[0093] If the inlet water temperature is lower than the first threshold and the energy storage temperature is lower than the second threshold, the over-flow heater is started.

[0094] Step 350: Obtain the theoretical outlet water temperature when the over-flow heater is in the startup working state.

[0095] Step 360: Based on the theoretical outlet water temperature, determine the target position of the thermostatic valve from a preset outlet water temperature-thermostatic valve position mapping table.

[0096] Step 370: Adjust the thermostatic valve from the first preset position to the target position.

[0097] In some embodiments, after adjusting the thermostatic valve from the first preset position to the target position, the method further includes fine-tuning the thermostatic valve. For details, refer to the fourth embodiment of the temperature control method of the water heater provided in the present application. The fourth embodiment includes the following steps: Step 410: Acquire initial temperature information after the water heater enters a normal working state.

[0098] Step 420: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to a first preset position.

[0099] Step 430: When the water flow rate is greater than or equal to the preset water flow rate threshold, determine whether the initial temperature information meets the first preset trigger requirement.

[0100] Step 440: If the initial temperature information meets the first preset trigger requirement, the over-current heater is controlled to be in a start-up working state.

[0101] Step 450: Obtain the theoretical outlet water temperature when the over-flow heater is in the startup working state.

[0102] Step 460: Based on the theoretical outlet water temperature, determine the target position of the thermostatic valve from a preset outlet water temperature-thermostatic valve position mapping table.

[0103] Step 470: Adjust the thermostatic valve from the first preset position to the target position.

[0104] Step 480: Obtain the actual outlet water temperature of the over-flow heater when it is in the startup working state.

[0105] Step 490: Determine whether the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference.

[0106] The actual outlet water temperature can be measured by a third temperature sensor and read directly by the system.

[0107] Step 500: If the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference, the thermostatic valve is adjusted from the target position to the actual target position corresponding to the actual outlet water temperature.

[0108] The preset temperature difference may be in the range of about 1°C.

[0109] For example, the actual water outlet temperature measured by the third temperature sensor is 41°C, while the preset water outlet temperature is 38. If the temperature difference between the two is greater than the preset temperature difference, it is necessary to fine-tune the thermostatic valve so that the final actual water outlet temperature is 38°C.

[0110] In this way, by further fine-tuning the position of the thermostatic valve, the final actual water outlet temperature can meet the user's water temperature requirements, thereby improving the user's experience.

[0111] In some embodiments, if the temperature difference between the actual water outlet temperature and the preset water outlet temperature is greater than the preset temperature difference, the thermostatic valve is adjusted from the target position to the actual target position corresponding to the actual water outlet temperature after the second delay period.

[0112] The value of the second delay time period t2 depends on the temperature rise stabilization time after the over-current heater is started, and is generally set to 5 to 35 seconds.

[0113] When the over-flow heater is started, the power of the over-flow heater will reach full power immediately, but due to heat transfer, the water flowing through the over-flow heater will not heat up immediately, and there will be a slow heating process until the water temperature stabilizes.

[0114] Therefore, the second delay period t2 is set to allow the outlet water temperature T3 to be read after the temperature rise generated by the over-flow heater is stabilized after startup.

[0115] Furthermore, the waiting time of the second delay period t2 can be used to introduce a "position correction" to complete the position correction of the thermostat, for example, to correct the thermostat valve from the first preset position A1 to the target position A2.

[0116] Referring to the fifth embodiment of the temperature control method of the water heater provided in the present application, the fifth embodiment includes the following steps: Step 510: Acquire initial temperature information after the water heater enters a normal working state.

[0117] Step 520: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to a first preset position.

[0118] Step 530: When the water flow rate does not meet the preset water flow rate threshold, determine whether the temperature difference between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference value.

[0119] Step 540: If the temperature difference between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference, the energy storage heater is controlled to be in a start-up working state.

[0120] Among them, the preset temperature difference is generally set to 2~10℃.

[0121] Based on the above embodiments, the temperature control method of the water heater provided in the present application may include the following steps: Step 11: After the water heater enters normal working state, adjust the thermostatic valve to position A1.

[0122] Among them, position A1 is the first preset position.

[0123] Among them, the current water inlet temperature T1, energy storage temperature T2, and water outlet setting temperature T30 can be read to look up the table (the table is obtained by sampling in advance according to different water inlet temperatures, different energy storage temperatures, and different water outlet setting temperatures, according to standard voltage U (220V) and standard flow rate Q (5L / min)), and then the thermostatic valve core can be driven to move to the corresponding position A1 in the sampling table.

[0124] Step 12: Determine whether the water flow rate is less than the threshold value Q0.

[0125] The threshold Q0 is a preset water flow threshold.

[0126] If yes, go to step 13-14; if no, go to step 15.

[0127] Step 13: Determine |energy storage temperature T2-energy storage setting temperature T2O|>temperature difference T200.

[0128] If yes, go to step 14; if no, wait for a while and return to step 13.

[0129] Among them, the energy storage setting temperature T2O is the preset energy storage temperature.

[0130] Step 14: Start the storage heater.

[0131] Step 15: Determine whether the water inlet temperature T1 is greater than the threshold value T28 & whether the energy storage temperature T2 is greater than the threshold value T50.

[0132] The water inlet temperature is the recorded value of the last water use event, the threshold T28 is the first threshold, and the threshold T50 is the second threshold.

[0133] If yes, execute step 16 to step 18; if no, execute step 19 to step 22.

[0134] Step 16: Start the storage heater.

[0135] Step 17: Determine whether |outlet water temperature T3-outlet water set temperature T30|>temperature difference T300.

[0136] If yes, go to step 18, if no, wait for a while and return to step 17.

[0137] Among them, the water outlet set temperature T30 is the preset water outlet temperature, and the temperature difference T300 is the preset temperature difference value.

[0138] Step 18: Fine-tune the thermostatic valve.

[0139] Step 19: Start the over-flow heater.

[0140] Step 20: Adjust the thermostatic valve position to A2 / A3.

[0141] Among them, A2 / A3 can be the target position.

[0142] Step 21: Determine whether |outlet water temperature T3-outlet water set temperature T30|>temperature difference T300.

[0143] If yes, go to step 22.

[0144] Step 22: Fine-tune the thermostatic valve.

[0145] In this way, the constant temperature adjustment process of pre-adjustment + position correction + fine-tuning can not only achieve rapid constant temperature, but also reduce water temperature fluctuations and improve users' bathing comfort experience.

[0146] like Figure 3 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. A 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 temperature control method of the water heater provided by any of the above method embodiments, including: Obtain the initial temperature information of the water heater after it enters normal working state; Based on the initial temperature information, pre-adjusting the position of the thermostatic valve to a first preset position; When the water flow rate is greater than or equal to a preset water flow rate threshold, determining whether the initial temperature information meets a first preset trigger requirement; If the initial temperature information does not meet the first preset trigger requirement, the over-flow heater is controlled to be in a startup working state; the theoretical outlet water temperature when the over-flow heater is in the startup working state is obtained; Based on the theoretical water outlet temperature, determining the target position of the thermostatic valve from a preset water outlet temperature-thermostatic valve position mapping table; Adjust the thermostatic valve from the first preset position to the target position.

[0147] 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.

[0148] Therefore, the 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 temperature control method of the water heater provided in any of the above method embodiments are implemented, including the following: Obtain the initial temperature information of the water heater after it enters normal working state; Based on the initial temperature information, pre-adjusting the position of the thermostatic valve to a first preset position; When the water flow rate is greater than or equal to a preset water flow rate threshold, determining whether the initial temperature information meets a first preset trigger requirement; If the initial temperature information does not meet the first preset trigger requirement, the over-flow heater is controlled to be in a startup working state; the theoretical outlet water temperature when the over-flow heater is in the startup working state is obtained; Based on the theoretical water outlet temperature, determining the target position of the thermostatic valve from a preset water outlet temperature-thermostatic valve position mapping table; Adjust the thermostatic valve from the first preset position to the target position.

[0149] 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. Computer-readable storage media can be non-volatile or volatile.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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 temperature control method for a water heater, characterized in that: The water heater comprises a thermostatic valve and an overflow heater, and the method comprises: Obtain the initial temperature information of the water heater after it enters normal working state; Based on the initial temperature information, pre-adjusting the position of the thermostatic valve to a first preset position; When the water flow rate is greater than or equal to a preset water flow rate threshold, determining whether the initial temperature information meets a first preset trigger requirement; If the initial temperature information does not meet the first preset trigger requirement, the over-flow heater is controlled to be in a start-up working state; and a theoretical water outlet temperature when the over-flow heater is in the start-up working state is obtained; Based on the theoretical water outlet temperature, determining the target position of the thermostatic valve from a preset water outlet temperature-thermostatic valve position mapping table; The thermostatic valve is adjusted from the first preset position to the target position.

2. The method according to claim 1, characterized in that The step of obtaining the theoretical outlet water temperature of the over-flow heater when the over-flow heater is in the startup working state comprises: Obtaining a standard temperature rise value of the over-flow heater, and an actual water flow rate and an actual voltage when the over-flow heater is in a startup working state; Based on the actual water flow and the actual voltage, obtaining an actual temperature rise value of the over-flow heater; Determining a temperature rise difference between the actual temperature rise value and the standard temperature rise value; Based on the temperature rise difference, the theoretical outlet water temperature of the overflow heater when it is in the startup working state is obtained.

3. The method according to claim 1, characterized in that The initial temperature information includes the water inlet temperature and the energy storage temperature. If the initial temperature information meets the first preset trigger requirement, the over-flow heater is controlled to be in a start-up working state, including: If the water inlet temperature and the energy storage temperature meet a first preset trigger requirement, then after a first delay period, the over-current heater is controlled to be in a start-up working state.

4. The method according to claim 1, characterized in that: The initial temperature information includes the water inlet temperature and the energy storage temperature, and the determining whether the initial temperature information meets the first preset trigger requirement includes: Determining whether the water inlet temperature is greater than a first threshold, and whether the energy storage temperature is greater than a second threshold, wherein the second threshold is greater than the first threshold; If the water inlet temperature is not greater than the first threshold and / or the energy storage temperature is not greater than the second threshold, it is determined that the initial temperature information does not meet the first preset trigger requirement.

5. The method according to claim 1, characterized in that After adjusting the thermostatic valve from the first preset position to the target position, the method further includes: Obtaining the actual outlet water temperature when the over-flow heater is in a startup working state; Determine whether the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference; If the temperature difference between the actual water outlet temperature and the preset water outlet temperature is greater than the preset temperature difference, the thermostatic valve is adjusted from the target position to the actual target position corresponding to the actual water outlet temperature.

6. The method according to claim 5, characterized in that If the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference, adjusting the thermostatic valve from the target position to the actual target position corresponding to the actual outlet water temperature includes: If the temperature difference between the actual water outlet temperature and the preset water outlet temperature is greater than the preset temperature difference, then after a second delay period, the thermostatic valve is adjusted from the target position to an actual target position corresponding to the actual water outlet temperature.

7. The method according to claim 2, characterized in that The step of obtaining the standard temperature rise value of the over-current heater comprises: Obtaining the power of the over-flow heater and the water flow rate of the over-flow heater per unit time; Based on the power of the over-flow heater, the water flow rate of the over-flow heater per unit time, and the specific heat capacity of water, a standard temperature rise value of the over-flow heater is obtained.

8. The method according to claim 1, characterized in that The method of determining whether the initial temperature information meets the first preset trigger requirement further includes: If the initial temperature information meets the first preset trigger requirement, the energy storage heater is controlled to be in a start-up working state after a first delay period; Obtaining the actual outlet water temperature when the energy storage heater is in a startup working state; Determine whether the temperature difference between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference; If the temperature difference between the actual water outlet temperature and the preset water outlet temperature is greater than the preset temperature difference, the thermostatic valve is adjusted from the first preset position to the actual target position corresponding to the actual water outlet temperature.

9. The method according to claim 1, characterized in that: After pre-adjusting the position of the thermostatic valve to the first preset position, the method further includes: When the water flow rate does not meet the preset water flow rate threshold, determining whether the temperature difference between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference value; If the temperature difference between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference, the energy storage heater is controlled to be in a start-up working state.

10. A temperature control system for a water heater, characterized in that: The temperature control system comprises: a water heater and a controller, wherein the controller is used to perform the steps of the method according to any one of claims 1 to 9; The water heater comprises an energy storage tank, a heat exchanger, an energy storage heater, an overflow heater, a thermostatic valve, a water flow sensor, a first temperature sensor, a second temperature sensor and a third temperature sensor; Wherein, the energy storage heater is arranged in the energy storage box; The heat exchanger and the second temperature sensor are arranged in the energy storage box; The thermostatic valve is connected to the outlet of the heat exchanger, the water inlet of the water heater and the overflow heater; The overflow heater is connected to the water outlet of the water heater; The inlet of the heat exchanger is in communication with the water inlet of the water heater; The first temperature sensor and the third temperature sensor are respectively located at the water inlet and the water outlet of the water heater.

Images