Temperature control method and system for water heater

Abstract

The present application relates to the technical field of water heaters, and provides a temperature control method and system for a water heater. The method includes: obtaining initial temperature information after the water heater enters a normal working state; based on the initial temperature information, pre-adjusting the position of the constant temperature 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, controlling the flow-through heater to be in a starting working state; obtaining the theoretical outlet water temperature when the flow-through heater is in the starting working state; based on the theoretical outlet water temperature, determining the target position of the constant temperature valve from a preset outlet water temperature-constant temperature valve position mapping table; and adjusting the constant temperature valve from the first preset position to the target position. The present application can improve the efficiency of constant temperature adjustment of the water heater.

Description

Technical Field

[0001] This application relates to the technical field of water heaters, and particularly 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 for constant-temperature hot water, constant-temperature electric water heaters have gradually become the mainstream products. A constant-temperature electric water heater is a water heater that can automatically adjust the outlet water temperature during the user's 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, through the built-in constant-temperature control system, monitor and adjust the water temperature in real time to avoid the problem of unstable water temperature caused by factors such as changes in water flow rate and fluctuations in inlet water temperature. This type of water heater is widely used in households, hotels, hospitals and other places, providing users with a more comfortable and stable hot water experience.

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

[0004] However, since the existing constant-temperature adjustment process is carried out step by step, the system takes a long time to stabilize the outlet water temperature at the target temperature. Especially when the water flow rate is large or the inlet water temperature is low, the system may need to be adjusted multiple times to reach the ideal water temperature, resulting in a long waiting time for users. Summary of the Invention

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

[0006] In a first aspect, the embodiments of this application provide a temperature control method for a water heater. The water heater includes a constant-temperature valve and a flow-through heater. The method includes:

[0007] Obtain the initial temperature information after the water heater enters the normal working state;

[0008] Based on the initial temperature information, pre-adjust the position of the constant-temperature valve to a first preset position;

[0009] 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;

[0010] If the initial temperature information does not meet the first preset trigger requirement, control the flow-through heater to be in the starting working state; obtain the theoretical outlet water temperature when the flow-through heater is in the starting working state;

[0011] 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;

[0012] Adjust the thermostatic valve from the first preset position to the target position.

[0013] In some embodiments, obtaining the theoretical outlet water temperature when the flow - through heater is in the starting working state includes:

[0014] Obtain the standard temperature rise value of the flow - through heater, as well as the actual water flow rate and actual voltage when the flow - through heater is in the starting working state;

[0015] Based on the actual water flow rate and actual voltage, obtain the actual temperature rise value of the flow - through heater;

[0016] Determine the temperature rise difference between the actual temperature rise value and the standard temperature rise value;

[0017] Based on the temperature rise difference, obtain the theoretical outlet water temperature when the flow - through heater is in the starting working state.

[0018] In some embodiments, the initial temperature information includes the inlet water temperature and the energy storage temperature. If the initial temperature information does not meet the first preset trigger requirement, controlling the flow - through heater to be in the starting working state includes:

[0019] If the inlet water temperature and the energy storage temperature do not meet the first preset trigger requirement, then after the first delay period, control the flow - through heater to be in the starting working state.

[0020] In some embodiments, the initial temperature information includes the inlet water temperature and the energy storage temperature. Judging whether the initial temperature information meets the first preset trigger requirement includes:

[0021] Judge whether the inlet water temperature is greater than the first threshold value and whether the energy storage temperature is greater than the second threshold value, where the second threshold value is greater than the first threshold value;

[0022] If the inlet water temperature is not greater than the first threshold value and / or the energy storage temperature is not greater than the second threshold value, then determine that the initial temperature information does not meet the first preset trigger requirement.

[0023] In some embodiments, after adjusting the thermostatic valve from the first preset position to the target position, the method further includes:

[0024] Obtain the actual outlet water temperature when the flow - through heater is in the starting working state;

[0025] Judge whether the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value;

[0026] If the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value, the thermostatic valve is adjusted from the target position to the actual target position corresponding to the actual outlet water temperature.

[0027] In some embodiments, if the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value, adjusting the thermostatic valve from the target position to the actual target position corresponding to the actual outlet water temperature includes:

[0028] If the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value, after the second delay time period, the thermostatic valve is adjusted from the target position to the actual target position corresponding to the actual outlet water temperature.

[0029] In some embodiments, obtaining the standard temperature rise value of the flow-through heater includes:

[0030] Obtaining the power of the flow-through heater and the water flow rate of the flow-through heater per unit time;

[0031] Based on the power of the flow-through heater, the water flow rate of the flow-through heater per unit time, and the specific heat capacity of water, the standard temperature rise value of the flow-through heater is obtained.

[0032] In some embodiments, to determine whether the initial temperature information meets the first preset trigger requirement, the method further includes:

[0033] If the initial temperature information meets the first preset trigger requirement, after delaying for the first time period, controlling the energy storage heater to be in the starting working state;

[0034] Obtaining the actual outlet water temperature when the energy storage heater is in the starting working state;

[0035] Determining whether the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value;

[0036] If the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value, the thermostatic valve is adjusted from the first preset position to the actual target position corresponding to the actual outlet water temperature.

[0037] In some embodiments, after pre-adjusting the position of the thermostatic valve to the first preset position, the method further includes:

[0038] When the water flow rate does not meet the preset water flow rate threshold, determining whether the temperature difference value between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference value;

[0039] If the temperature difference value between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference value, controlling the energy storage heater to be in the starting working state.

[0040] Second aspect, an embodiment of the present application further provides a temperature control system for a water heater. The temperature control system includes: a water heater and a controller, wherein the controller is configured to execute the steps of the above method;

[0041] The water heater includes a storage tank, a heat exchanger, a storage heater, a flow-through heater, a thermostatic valve, a water flow sensor, a first temperature sensor, a second temperature sensor, and a third temperature sensor;

[0042] Wherein, the storage heater is disposed inside the storage tank;

[0043] The heat exchanger and the second temperature sensor are disposed in the storage tank;

[0044] The thermostatic valve is connected to the outlet of the heat exchanger, the water inlet of the water heater, and the flow-through heater;

[0045] The flow-through heater is connected to the water outlet of the water heater;

[0046] The inlet of the heat exchanger is communicated with the water inlet of the water heater;

[0047] The first temperature sensor and the third temperature sensor are respectively located at the water inlet and the water outlet of the water heater.

[0048] An 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 the normal working state, first pre-adjust the thermostatic valve to a first preset position. When it is determined that the user uses water (that is, the water flow is greater than or equal to a preset water flow threshold) and the initial temperature information does not meet the first preset trigger requirement, control the flow-through heater to be in the starting working state, and determine the target position of the thermostatic valve from a preset mapping table of outlet water temperature - thermostatic valve position by obtaining the theoretical outlet water temperature when the flow-through heater is in the starting working state, and adjust the thermostatic valve from the first preset position to the target position.

[0049] Since the mapping table of outlet water temperature - thermostatic valve position is preset and covers the corresponding relationship between the outlet water temperature and the thermostatic valve position under different working conditions, therefore, after obtaining the theoretical outlet water temperature when the flow-through heater is in the starting working state in the present application, by looking up the mapping table of outlet water temperature - thermostatic valve position, the target position of the thermostatic valve can be quickly found, and the thermostatic valve can be directly adjusted 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. Description of the Drawings

[0050] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0051] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0052] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated, and the drawings in the figures do not constitute a scale limitation.

[0053] Figure 1 It is a schematic structural diagram of a water heater provided for an embodiment of the present application.

[0054] Figure 2 It is a schematic flowchart of the first embodiment of the temperature control method for the water heater provided by the present application.

[0055] Figure 3 It is a schematic structural diagram of a computer device provided for an embodiment of the present application.

[0056] Explanation of the reference numerals in the drawings: water heater 10, energy storage tank 100, heat exchanger 101, energy storage heater 102, flow-through heater 103, constant temperature 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 implementation manners

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0058] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals 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.

[0059] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0060] It should also be understood that the terms used in the specification of this application are merely for the purpose of describing specific embodiments and are not intended to limit this application. As used in the specification of this application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0061] It should be further understood that the term "and / or" used in the specification of this application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0062] As used in this specification and the appended claims, the term "if" can be interpreted as "when...", "once", "in response to determining", or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" depending on the context.

[0063] In order to solve the technical problem in the prior art that the existing constant temperature regulation 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, this application provides a temperature control method for a water heater, which can improve the efficiency of constant temperature regulation of the water heater.

[0064] This application provides a temperature control system for a water heater. The temperature control system includes: a water heater and a controller, wherein the controller is used to execute the method steps of the following embodiments.

[0065] As Figure 1 shown, the water heater 10 provided in this application includes a storage tank 100, a heat exchanger 101, a storage heater 102, a flow-through heater 103, a constant temperature valve 104, a water flow sensor 105, a first temperature sensor 106, a second temperature sensor 107, and a third temperature sensor 108.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] The inlet of the heat exchanger 101 is in communication with the water inlet 201 of the water heater 10;

[0072] 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.

[0073] 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.

[0074] 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:

[0075] Step 110: Acquire initial temperature information after the water heater enters a normal working state.

[0076] Step 120: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to a first preset position.

[0077] 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.

[0078] Step 140: If the initial temperature information does not meet the first preset trigger requirement, control the flow-through heater to be in the starting working state.

[0079] Step 150: Obtain the theoretical outlet water temperature when the flow-through heater is in the starting working state.

[0080] 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.

[0081] Step 170: Adjust the thermostatic valve from the first preset position to the target position.

[0082] Since the outlet water temperature - thermostatic valve position mapping table is preset and covers the corresponding relationship between the outlet water temperature and the thermostatic valve position under different working conditions, after obtaining the theoretical outlet water temperature when the flow-through heater is in the starting working state in this embodiment, by looking up the outlet water temperature - thermostatic valve position mapping table, the target position of the thermostatic valve can be quickly found, and the thermostatic valve can be directly adjusted 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.

[0083] In some embodiments, step 150, i.e., obtaining the theoretical outlet water temperature when the flow-through heater is in the starting working state, includes the following steps:

[0084] Step 151: Obtain the standard temperature rise value of the flow-through heater, as well as the actual water flow rate and actual voltage when the flow-through heater is in the starting working state.

[0085] Among them, the standard temperature rise value of the flow-through heater can be obtained as follows:

[0086] 1) Obtain the power of the flow-through heater and the water flow rate of the flow-through heater per unit time;

[0087] 2) Based on the power of the flow-through heater, the water flow rate of the flow-through heater per unit time, and the specific heat capacity of water, obtain the standard temperature rise value of the flow-through heater.

[0088] In some embodiments, without considering the conversion efficiency, the calculation of the standard temperature rise value can adopt the following formula 1:

[0089] , formula 1.

[0090] Among them, P*t represents the electrical energy generated; It represents the temperature energy change caused by the temperature rise generated by electric energy; P represents the rated power of the flow-through heater; t represents the unit time, for example, it can be 1 min; C represents the specific heat capacity of water, 4.2×10³ J / (kg·℃); M represents the mass of water flowing through the flow-through heater per unit time, that is, equivalent to the water flow rate of the flow-through 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 flow-through heater can bring under standard conditions, that is, the standard temperature rise value.

[0091] Step 152: Based on the actual water flow rate and the actual voltage, obtain the actual temperature rise value of the flow-through heater.

[0092] The above formula 1 can be understood as the output electric energy being converted into the temperature rise value of unit water. P is the rated power, which can be equivalently understood as the relationship between voltage and resistance U*U / R. That is, formula 1 can be converted into the following formula 2:

[0093] , formula 2.

[0094] Among them, U is the voltage, which can be read in real time by the controller. Q is the water flow rate of the flow-through heater per unit time, which can be read by the water flow sensor at the water inlet. During the actual water use process, both U and Q are variable values.

[0095] For example, at time t1, the measured voltage is U1 and the water flow rate is Q1, then the actual temperature rise value at this moment can be calculated correspondingly .

[0096] Step 153: Determine the temperature rise difference between the actual temperature rise value and the standard temperature rise value.

[0097] That is, the temperature rise difference .

[0098] Step 154: Based on the temperature rise difference, obtain the theoretical outlet water temperature when the flow-through heater is in the startup working state.

[0099] It is assumed that the preset mapping table of outlet water temperature - thermostatic valve position can include the following Table 1 - Table 3.

[0100] Table 1

[0101]

[0102] Table 2

[0103]

[0104] Table 3

[0105]

[0106] Among them, Tables 1 - 3 are sampling tables, and sampling tables corresponding to different outlet water temperatures under different inlet water temperatures, different energy storage temperatures, standard voltage U, and standard flow rate Q are collected in advance. The positions A1 / A2 / A3 of the thermostatic valve spool in Tables 1 - 3 are obtained by sampling or calculation.

[0107] Among them, the standard voltage can be 220V, and the standard flow rate can be 5L / min.

[0108] Referring to Tables 1 - 3 above, if, based on the initial temperature information, the position of the thermostatic valve is pre - adjusted to the first preset position, which is the A103 position in Table 1, then after calculating the temperature rise difference such as greater than 0), then the theoretical outlet water temperature can be obtained as the outlet water temperature , that is, find Table 2, and find the target position as the A203 position in Table 2.

[0109] Among them, can be rounded to an integer, such as 1, 2, 3, 4, etc.

[0110] Referring to the second embodiment of the temperature control method of the water heater provided in this application, the method includes:

[0111] Step 210: Obtain the initial temperature information after the water heater enters the normal working state.

[0112] Step 220: Based on the initial temperature information, pre - adjust the position of the thermostatic valve to the first preset position.

[0113] 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.

[0114] Among them, the preset water flow rate threshold Q0 can be set to 2.5L / min. If the water flow rate is greater than or equal to the preset water flow rate threshold, it can indicate that the user is using water.

[0115] Among them, the initial temperature information includes the current inlet water temperature, energy storage temperature, and preset outlet water temperature.

[0116] Step 240: If the inlet water temperature and the energy storage temperature do not meet the first preset trigger requirement, then after the first delay period, control the flow - through heater to be in the startup working state.

[0117] 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 tank will be transferred through the connected pipeline, causing the temperature of the water in the connected pipeline to rise. When using water, the water in this section of the pipeline will be discharged first. If this section of hot water passes through the flow-through heater when the flow-through heater is already turned on, it will cause the temperature of this section of hot water to rise again, and when it reaches the water outlet, it is easy to scald the user. Therefore, before starting the flow-through heater, adding a delay period, that is, the first delay period t1, is to wait for this section of hot water to flow through the flow-through heater before starting the flow-through heater, so as to avoid scalding the user due to too high water temperature at the water outlet.

[0118] Among them, the value of the first period t1 depends on the volume of water in the water circuit and the current water flow rate, and is generally set to 3 - 8 s.

[0119] Step 250: Obtain the theoretical outlet water temperature when the flow-through heater is in the starting working state.

[0120] Step 260: Based on the theoretical outlet water temperature, determine the target position of the constant temperature valve from the preset mapping table of outlet water temperature - constant temperature valve position.

[0121] Step 270: Adjust the constant temperature valve from the first preset position to the target position.

[0122] In some embodiments, if the initial temperature information does not meet the first preset trigger requirement, the following steps are executed:

[0123] Step 241: If the initial temperature information meets the first preset trigger requirement, after delaying for the first period, control the energy storage heater to be in the starting working state.

[0124] Among them, the initial temperature information meeting the first preset trigger requirement means that the inlet water temperature is too high and the energy storage temperature meets the bathing condition with hot water. Then, the flow-through heater is not started, but to ensure sufficient hot water volume, the energy storage heater can be started for continuous heat supplement.

[0125] In addition, delaying the first period t1 is to give priority to discharging the water in the original water circuit, avoiding superposition with the temperature rise after the energy storage heater is started, resulting in over-temperature of the outlet water.

[0126] Among them, the value of the first period t1 depends on the volume of water in the water circuit and the current water flow rate, and is generally set to 3 - 8 s.

[0127] Step 251: Obtain the actual outlet water temperature when the energy storage heater is in the starting working state.

[0128] Step 261: Determine whether the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value.

[0129] Step 271: If the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value, adjust the thermostatic valve from the first preset position to the actual target position corresponding to the actual outlet water temperature.

[0130] In some embodiments, the initial temperature information includes the inlet water temperature and the energy storage temperature. Referring to the third embodiment of the temperature control method of the water heater provided in this application, the method includes:

[0131] Step 310: Obtain the initial temperature information after the water heater enters the normal working state.

[0132] Step 320: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to the first preset position.

[0133] Step 330: When the water flow rate is greater than or equal to the preset water flow rate threshold, determine whether the inlet water temperature is greater than the first threshold and whether the energy storage temperature is greater than the second threshold.

[0134] Wherein, the second threshold is greater than the first threshold. The first threshold depends on the power of the flow-through heater and is generally set to 23 - 35 °C; the second threshold depends on the minimum energy storage temperature of the energy storage tank to meet bathing requirements and is generally set to 40 - 55 °C.

[0135] Step 340: If the inlet water 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 control the flow-through heater to be in the starting working state.

[0136] That is, if the inlet water temperature is less than the first threshold and the energy storage temperature is greater than the second threshold, start the flow-through heater.

[0137] If the inlet water temperature is greater than the first threshold and the energy storage temperature is less than the second threshold, start the flow-through heater.

[0138] If the inlet water temperature is less than the first threshold and the energy storage temperature is less than the second threshold, start the flow-through heater.

[0139] Step 350: Obtain the theoretical outlet water temperature when the flow-through heater is in the starting working state.

[0140] Step 360: Based on the theoretical outlet water temperature, determine the target position of the thermostatic valve from the preset outlet water temperature - thermostatic valve position mapping table.

[0141] Step 370: Adjust the thermostatic valve from the first preset position to the target position.

[0142] In some embodiments, after adjusting the thermostatic valve from the first preset position to the target position, the method further includes finely tuning the thermostatic valve. Specifically, refer to the fourth embodiment of the temperature control method of the water heater provided in this application. The fourth embodiment includes the following steps:

[0143] Step 410: Obtain the initial temperature information after the water heater enters the normal working state.

[0144] Step 420: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to the first preset position.

[0145] 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.

[0146] Step 440: If the initial temperature information does not meet the first preset trigger requirement, control the flow-through heater to be in the startup working state.

[0147] Step 450: Obtain the theoretical outlet water temperature when the flow-through heater is in the startup working state.

[0148] Step 460: Based on the theoretical outlet water temperature, determine the target position of the thermostatic valve from the preset outlet water temperature - thermostatic valve position mapping table.

[0149] Step 470: Adjust the thermostatic valve from the first preset position to the target position.

[0150] Step 480: Obtain the actual outlet water temperature when the flow-through heater is in the startup working state.

[0151] Step 490: Determine whether the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value.

[0152] Among them, the actual outlet water temperature can be measured by the third temperature sensor and directly read by the system.

[0153] Step 500: If the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value, adjust the thermostatic valve from the target position to the actual target position corresponding to the actual outlet water temperature.

[0154] Among them, the range of the preset temperature difference value can be about 1°C.

[0155] For example, if the actual outlet water temperature measured by the third temperature sensor is 41°C, and the preset outlet water temperature is 38°C, and the temperature difference value between the two is greater than the preset temperature difference value, then it is necessary to finely adjust the thermostatic valve so that the final actual outlet water temperature is 38°C.

[0156] Thus, by further finely adjusting the position of the thermostatic valve, the final actual outlet water temperature can meet the user's water temperature requirements, thereby improving the user experience.

[0157] 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 value, 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.

[0158] Wherein, the value of the second delay period t2 depends on the temperature rise stabilization time generated after the flow-through heater is started, and is generally set to 5 - 35 s.

[0159] When the flow-through heater is started, although the power of the flow-through heater will immediately reach the full power, due to heat transfer, the water flowing through the flow-through heater will not immediately become hot, and there will be a slow heating process until the water temperature stabilizes.

[0160] Therefore, setting the second delay period t2 is to read the outlet water temperature T3 after the temperature rise generated after the flow-through heater is started stabilizes.

[0161] And the "position correction" can be introduced during the waiting time of the second delay period t2 to complete the position correction for constant temperature. For example, the thermostatic valve is corrected from the first preset position A1 to the target position A2.

[0162] Referring to the fifth embodiment of the temperature control method of the water heater provided in this application, the fifth embodiment includes the following steps:

[0163] Step 510: Obtain the initial temperature information after the water heater enters the normal working state.

[0164] Step 520: Based on the initial temperature information, pre-adjust the position of the thermostatic valve to the first preset position.

[0165] 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.

[0166] Step 540: If the temperature difference between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference value, control the energy storage heater to be in the start working state.

[0167] Wherein, the preset temperature difference value is generally set to 2 - 10 °C.

[0168] Based on the above embodiments, the temperature control method of the water heater provided in this application may include the following steps:

[0169] Step 11: After the water heater enters the normal working state, adjust the thermostatic valve to position A1.

[0170] Among them, position A1 is the first preset position.

[0171] Among them, by reading the current inlet water temperature T1, energy storage temperature T2, and outlet water set temperature T30, a look-up table can be performed (the table is obtained by sampling in advance according to different inlet water temperatures, different energy storage temperatures, and different outlet water set temperatures at the standard voltage U (220V) and standard flow rate Q (5L / min)), and then drive the constant temperature valve spool to move to the corresponding position A1 in the sampling table.

[0172] Step 12: Determine whether the water flow rate is less than the threshold Q0.

[0173] Among them, the threshold Q0 is the preset water flow rate threshold.

[0174] If so, execute steps 13 - 14; if not, execute step 15.

[0175] Step 13: Determine whether |energy storage temperature T2 - energy storage set temperature T2O| > temperature difference T200.

[0176] If so, execute step 14; if not, wait for a period of time and then return to step 13.

[0177] Among them, the energy storage set temperature T2O is the preset energy storage temperature.

[0178] Step 14: Start the energy storage heater.

[0179] Step 15: Determine whether the inlet water temperature T1 > threshold T28 & the energy storage temperature T2 > threshold T50.

[0180] Among them, the inlet water temperature is the recorded value of the previous water use event, the threshold T28 is the first threshold, and the threshold T50 is the second threshold.

[0181] If so, execute steps 16 - 18; if not, execute steps 19 - 22.

[0182] Step 16: Start the energy storage heater.

[0183] Step 17: Determine whether |outlet water temperature T3 - outlet water set temperature T30| > temperature difference T300.

[0184] If so, execute step 18; if not, wait for a period of time and then return to step 17.

[0185] Among them, the outlet water set temperature T30 is the preset outlet water temperature, and the temperature difference T300 is the preset temperature difference value.

[0186] Step 18: Fine-tune the constant temperature valve.

[0187] Step 19: Start the flow-through heater.

[0188] Step 20: Adjust the position of the thermostatic valve to A2 / A3.

[0189] Wherein, A2 / A3 can be the target position.

[0190] Step 21: Determine whether |the outlet water temperature T3 - the set outlet water temperature T30| > the temperature difference T300.

[0191] If yes, execute Step 22.

[0192] Step 22: Fine-tune the thermostatic valve.

[0193] 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 the water temperature fluctuation and improve the user's bathing comfort experience.

[0194] As Figure 3 shown, an 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. Among them, the processor 111, the communication interface 112, and the memory 113 complete mutual communication through the communication bus 114.

[0195] The memory 113 is used to store computer programs.

[0196] In an embodiment of the present application, when the processor 111 executes the program stored on the memory 113, it implements the temperature control method of the water heater provided in any one of the foregoing method embodiments, including:

[0197] Obtain the initial temperature information after the water heater enters the normal working state;

[0198] Based on the initial temperature information, pre-adjust the position of the thermostatic valve to the first preset position;

[0199] 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;

[0200] If the initial temperature information does not meet the first preset trigger requirement, control the flow-through heater to be in the start working state; obtain the theoretical outlet water temperature when the flow-through heater is in the start working state;

[0201] Based on the theoretical outlet water temperature, determine the target position of the thermostatic valve from the preset outlet water temperature - thermostatic valve position mapping table;

[0202] Adjust the thermostatic valve from the first preset position to the target position.

[0203] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a storage medium, and the storage medium 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 embodiments of the above methods.

[0204] Therefore, the embodiments of the present application also provide a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the temperature control method of the water heater provided in any of the foregoing method embodiments, including the following:

[0205] Obtain the initial temperature information after the water heater enters the normal working state;

[0206] Based on the initial temperature information, pre-adjust the position of the constant temperature valve to the first preset position;

[0207] 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;

[0208] If the initial temperature information does not meet the first preset trigger requirement, control the flow-through heater to be in the starting working state; obtain the theoretical outlet water temperature when the flow-through heater is in the starting working state;

[0209] Based on the theoretical outlet water temperature, determine the target position of the constant temperature valve from the preset outlet water temperature - constant temperature valve position mapping table;

[0210] Adjust the constant temperature valve from the first preset position to the target position.

[0211] The storage medium is a physical, non-transitory storage medium, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disc, etc., which are various physical storage media that can store program codes. The computer-readable storage medium can be non-volatile or volatile.

[0212] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0213] In 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 merely illustrative. 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.

[0214] The steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs. The units in the device embodiments of the present application can be combined, divided, and deleted according to actual needs. In addition, in each embodiment of the present application, each functional unit can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0215] 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 essence of the technical solution of the present application, 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. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a terminal, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application.

[0216] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0217] 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, provided that these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

[0218] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present application, and these modifications or substitutions should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A temperature control method for a water heater, characterized in that, The water heater includes an energy storage tank, a heat exchanger, an energy storage heater, a flow-through 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 tank; the heat exchanger and the second temperature sensor are arranged in the energy storage tank; the thermostatic valve is connected to the outlet of the heat exchanger, the water inlet of the water heater, and the flow-through heater; the flow-through heater is connected to the water outlet of the water heater; the inlet of the heat exchanger is communicated 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; The method includes: Obtaining initial temperature information after the water heater enters the normal working state, wherein the initial temperature information includes the inlet water temperature, the energy storage temperature, and the preset outlet water temperature; Based on the initial temperature information, pre-adjusting the position of the thermostatic valve to a first preset position; When the water flow is greater than or equal to a preset water flow 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, controlling the flow-through heater to be in the startup working state; obtaining the theoretical outlet water temperature when the flow-through heater is in the startup working state; Based on the theoretical outlet water temperature, determining the target position of the thermostatic valve from a preset mapping table of outlet water temperature - thermostatic valve position; Adjusting the thermostatic valve from the first preset position to the target position; Wherein, the obtaining the theoretical outlet water temperature when the flow-through heater is in the startup working state includes: Obtaining the standard temperature rise value of the flow-through heater, as well as the actual water flow and the actual voltage when the flow-through heater is in the startup working state; Based on the actual water flow and the actual voltage, obtaining the actual temperature rise value of the flow-through heater; Determining the temperature rise difference between the actual temperature rise value and the standard temperature rise value; Based on the temperature rise difference, obtaining the theoretical outlet water temperature when the flow-through heater is in the startup working state; Wherein, the determining whether the initial temperature information meets the first preset trigger requirement includes: Determining whether the inlet water temperature is greater than a first threshold value, and whether the energy storage temperature is greater than a second threshold value, wherein the second threshold value is greater than the first threshold value; If the inlet water temperature is not greater than the first threshold value and / or the energy storage temperature is not greater than the second threshold value, determining that the initial temperature information does not meet the first preset trigger requirement.

2. The method according to claim 1, wherein The if the initial temperature information does not meet the first preset trigger requirement, then controlling the flow-through heater to be in the startup working state includes: If the inlet water temperature and the energy storage temperature do not meet the first preset trigger requirement, then after a first delay period, controlling the flow-through heater to be in the startup working state.

3. The method according to claim 1, wherein The obtaining the standard temperature rise value of the flow-through heater includes: Obtaining the power of the flow-through heater, as well as the water flow of the flow-through heater per unit time; Based on the power of the flow-through heater, the water flow rate of the flow-through heater per unit time, and the specific heat capacity of water, the standard temperature rise value of the flow-through heater is obtained.

4. The method according to claim 1, wherein The judging whether the initial temperature information meets the first preset trigger requirement includes: If the initial temperature information meets the first preset trigger requirement, after a first time period of delay, control the energy storage heater to be in a starting working state; Obtain the actual outlet water temperature when the energy storage heater is in a starting working state; Judge whether the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value; If the temperature difference value between the actual outlet water temperature and the preset outlet water temperature is greater than the preset temperature difference value, adjust the constant temperature valve from the first preset position to the actual target position corresponding to the actual outlet water temperature.

5. The method according to claim 1, characterized in that, After the position of the constant temperature valve is pre-adjusted to the first preset position, the method further includes: When the water flow rate does not meet the preset water flow rate threshold, judge whether the temperature difference value between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference value; If the temperature difference value between the energy storage temperature and the preset energy storage temperature is greater than the preset temperature difference value, control the energy storage heater to be in a starting working state.

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