Control method and device for energy storage heat exchange electric water heater

Abstract

The present application relates to the field of household electrical appliances, and discloses a control method and device for an energy storage heat exchange electric water heater, the method comprising: using an energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm; using the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water with a first preset temperature value; obtaining a water flow signal value of the energy storage heat exchange electric water heater; judging whether the water flow signal value meets a first preset trigger requirement; if the water flow signal value meets the first preset trigger requirement, outputting the water with the first preset temperature value in the heat exchanger to a thermostatic valve; controlling the overflow electric heater and the thermostatic valve to be in a start-up working state at the same time, using the thermostatic valve to mix the water with the first preset temperature value with the cold water input from the water inlet to obtain mixed water; using the overflow electric heater to heat the mixed water output by the thermostatic valve to a second preset temperature value. The present application can reduce the time it takes for users to use water from boiling water to using water.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a control method and device for an energy storage heat exchange electric water heater. Background Art

[0002] At present, in order to reduce the consumption of energy storage electric heaters during the heating process, energy storage heat exchange electric water heaters have introduced overflow electric heaters to reheat the water output by the thermostatic valve. However, during the heating process, in order to prevent the constant temperature function from being affected by the overflow electric heater and continuously increasing the water temperature, causing the thermostatic valve to repeatedly adjust the constant temperature according to different real-time readings, after the overflow electric heater starts heating, the constant temperature function is started after a certain delay. However, this approach increases the time it takes for users to use water from boiling water, that is, increases the waiting time for users. Summary of the invention

[0003] The present application provides a control method and device for an energy storage heat exchange electric water heater, which can reduce the time it takes for a user to use water from boiling water to using water, that is, shorten the waiting time for the user.

[0004] In a first aspect, the present application provides a control method for an energy storage heat exchange electric water heater, wherein the energy storage heat exchange electric water heater comprises a water tank, an energy storage electric heater, a heat exchanger, an overflow electric heater and a thermostatic valve, wherein the energy storage electric heater and the heat exchanger are arranged in the water tank, the overflow electric heater and the thermostatic valve are arranged outside the water tank, and the thermostatic valve is connected to the outlet of the heat exchanger, the overflow electric heater, and the water inlet of the energy storage heat exchange electric water heater; the method comprises:

[0005] Using the energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm;

[0006] Using the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water with a first preset temperature value;

[0007] Obtain the water flow signal value of the energy storage heat exchange electric water heater;

[0008] Determining whether the water flow signal value meets a first preset trigger requirement;

[0009] If the water flow signal value meets the first preset trigger requirement, water of the first preset temperature value in the heat exchanger is output to the thermostatic valve;

[0010] Controlling the over-flow electric heater and the thermostatic valve to be in a start-up working state at the same time, and using the thermostatic valve to mix water with a first preset temperature value with cold water input from the water inlet to obtain mixed water;

[0011] The mixed water output by the thermostatic valve is heated to a second preset temperature value by using an over-flow electric heater, wherein the second preset temperature value is greater than the first preset temperature value.

[0012] A further technical solution is to determine whether the water flow signal value meets the first preset trigger requirement, including:

[0013] Determine whether the water flow signal value is greater than the preset water flow value;

[0014] If the water flow signal value is greater than the preset water flow value, it is determined that the water flow signal value meets the first preset trigger requirement.

[0015] A further technical solution is that before controlling the overflow electric heater and the thermostatic valve to be in a startup working state at the same time, the method further includes:

[0016] Get the outlet water temperature of the thermostatic valve;

[0017] Determining whether the outlet water temperature meets a second preset trigger requirement;

[0018] If the outlet water temperature meets the second preset trigger requirement, the overflow electric heater and the thermostatic valve are controlled to be in a start-up working state at the same time.

[0019] A further technical solution is to determine whether the outlet water temperature meets the second preset trigger requirement, including:

[0020] Obtain the preset temperature rise value of the over-current electric heater;

[0021] Determining a temperature difference between a second preset temperature value and a preset temperature rise value;

[0022] Determine whether the outlet water temperature is greater than or equal to the temperature difference;

[0023] If the outlet water temperature is greater than or equal to the temperature difference, it is determined that the outlet water temperature meets the second preset trigger requirement.

[0024] A further technical solution is to determine whether the water flow signal value meets the first preset trigger requirement, and further include:

[0025] If the water flow signal value does not meet the first preset trigger requirement, obtaining the water tank temperature in the energy storage heat exchange electric water heater;

[0026] Determining whether the water tank temperature in the energy storage heat exchange electric water heater meets a third preset trigger requirement;

[0027] If the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement, the energy storage electric heater is controlled to be in a start-up working state.

[0028] A further technical solution is to determine whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement, including:

[0029] Determine the target set temperature of the energy storage heat exchange electric water heater;

[0030] Determine whether the water tank temperature in the energy storage heat exchange electric water heater is less than or equal to the target set temperature;

[0031] If the water tank temperature in the energy storage heat exchange electric water heater is less than or equal to the target set temperature, it is determined that the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement.

[0032] A further technical solution is to determine the target set temperature of the energy storage heat exchange electric water heater, including:

[0033] Obtain the initial set temperature and hysteresis temperature of the energy storage heat exchange electric water heater;

[0034] Based on the difference between the initial set temperature and the hysteresis temperature, the target set temperature of the energy storage heat exchange electric water heater is obtained.

[0035] A further technical solution is to determine whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement, and further includes:

[0036] If the water tank temperature in the energy storage heat exchange electric water heater does not meet the third preset trigger requirement, the energy storage electric heater is controlled to be in an off-working state.

[0037] In a second aspect, the present application provides a control device for an energy storage heat exchange electric water heater, the control device comprising: an energy storage heat exchange electric water heater and a controller, wherein the controller is used to perform the steps of any of the above methods;

[0038] The energy storage heat exchange electric water heater comprises a water tank, a heat exchanger, an energy storage electric heater, an over-current electric heater, a thermostatic valve, a water flow sensor, a first temperature sensor and a second temperature sensor;

[0039] Wherein, the energy storage electric heater is arranged in the water tank;

[0040] The heat exchanger and the first temperature sensor are arranged in the water tank;

[0041] The second temperature sensor is arranged between the thermostatic valve and the overflow electric heater;

[0042] The thermostatic valve is connected to the outlet of the heat exchanger, the overflow electric heater, and the water inlet of the energy storage heat exchange electric water heater;

[0043] The over-flow electric heater is connected to the water outlet of the energy storage heat exchange electric water heater;

[0044] The inlet of the heat exchanger is connected to the water inlet of the energy storage heat exchange type electric water heater.

[0045] A further technical solution is that the heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchange structure.

[0046] The beneficial effects of the present application are: different from the prior art, since the present application controls the flow-through electric heater and the thermostatic valve to be in the starting working state at the same time, the thermostatic valve can mix the cold water with the hot water output by the heat exchanger and then flow through the flow-through electric heater for heating, that is, the flow-through electric heater can directly heat the mixed water output by the thermostatic valve without heating the cold water of the thermostatic valve. Therefore, the water temperature output by the flow-through electric heater after heating the mixed water can reach the second preset temperature value relatively quickly, that is, reach the water temperature required by the user, therefore, it helps to reduce the time from users turning on the water to using the water, that is, shorten the time users wait for water. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0048] Figure 1 A schematic structural diagram of an embodiment of an energy storage heat exchange electric water heater provided in this application;

[0049] Figure 2 A schematic flow chart of an embodiment of a control method for an energy storage heat exchange electric water heater provided in the present application;

[0050] Figure 3 A schematic flow chart of another embodiment of the control method of the energy storage heat exchange electric water heater provided in the present application.

[0051] Description of Figure Numbers:

[0052] Energy storage heat exchange electric water heater 10, water inlet 11, water outlet 12, water tank 100, heat exchanger 200, energy storage electric heater 300, overflow electric heater 400, thermostatic valve 500, shell 700, insulation layer 800, water flow sensor 900, first temperature sensor 101, second temperature sensor 102. DETAILED DESCRIPTION

[0053] 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.

[0054] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, 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 invention. In addition, the present invention 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.

[0055] At present, in order to reduce the consumption of energy storage electric heaters during the heating process, energy storage heat exchange electric water heaters have introduced overflow electric heaters to reheat the water output by the thermostatic valve. However, during the heating process, in order to prevent the constant temperature function from being affected by the overflow electric heater and continuously increasing the water temperature, causing the thermostatic valve to repeatedly adjust the constant temperature according to different real-time readings, after the overflow electric heater starts heating, the constant temperature function is started after a certain delay. However, this approach increases the time it takes for users to use water from boiling water, that is, increases the waiting time for users.

[0056] Therefore, in order to solve the above technical problems, the present application provides a control method and device for an energy storage heat exchange electric water heater, which can reduce the time from boiling water to using water for users. Please refer to the following embodiments for details.

[0057] like Figure 1 As shown, the control device of the energy storage heat exchange electric water heater provided in the present application includes an energy storage heat exchange electric water heater 10 and a controller, wherein the controller is used to execute the steps of the following method embodiment, and the energy storage heat exchange electric water heater 10 includes a water tank 100, a heat exchanger 200, an energy storage electric heater 300, an overflow electric heater 400, a thermostatic valve 500, a water flow sensor 900, a first temperature sensor 101 and a second temperature sensor 102.

[0058] The water tank 100 is used to store energy storage materials, preferably water in this solution, and the temperature rise and fall of water are used to achieve energy storage and energy release. In other embodiments, the energy storage material in the water tank 100 may also be oil or other materials. In some embodiments, an insulation layer 800 may be provided outside the water tank 100 to keep the energy of the water stored in the water tank 100 warm and slow down the natural loss of energy.

[0059] The energy storage electric heater 300 is disposed in the water tank 100 and is used to heat the water in the water tank 100 so as to store energy.

[0060] The heat exchanger 200 and the first temperature sensor 101 are arranged in the water tank 100, wherein the inlet of the heat exchanger 200 is connected to the water inlet 11 of the energy storage heat exchange electric water heater 10, and the outer wall of the heat exchanger 200 can be completely immersed in the water in the water tank 100 for sufficient heat exchange. The interior of the heat exchanger 200 is bathing water, and the inner and outer walls of the heat exchanger 200 are used to exchange heat with the water in the water tank 100 to increase the temperature of the bathing water. The first temperature sensor 101 is arranged inside the water tank 100 or on the outer wall of the water tank 100, and is used to read the temperature of the water inside the water tank 100.

[0061] The second temperature sensor 102 is disposed between the thermostatic valve 500 and the overflow electric heater 400 , that is, at the end of the thermostatic valve 500 and the front end of the overflow electric heater 400 , and is used to read the outlet water temperature after constant temperature operation.

[0062] The thermostatic valve 500 is arranged outside the water tank 100, connected to the outlet of the heat exchanger 200 and the water inlet 11 of the energy storage heat exchange electric water heater 10, and is used to mix the bathing hot water output by the heat exchanger 200 and the cold water of the water inlet 11 branch to achieve the required water temperature.

[0063] The overflow electric heater 400 is connected to the water outlet 12 of the energy storage heat exchange electric water heater and the end of the thermostatic valve 500, and is used to reheat the mixed water output from the thermostatic valve 500 after constant temperature to reach the bathing water temperature.

[0064] In some embodiments, a water flow sensor may be provided at the water inlet 11 or the water outlet 12 of the energy storage heat exchange electric water heater to read the water flow rate entering the energy storage heat exchange electric water heater.

[0065] Specifically, in this embodiment, water flows into the water inlet 11 of the energy storage heat exchange electric water heater and is divided into two branches. The first branch enters the thermostatic valve 500, and the second branch enters the heat exchanger 200 for heat exchange. After the heat exchange, the water temperature becomes hot and also enters the thermostatic valve 500; the cold and hot water entering the thermostatic valve 500 flow out after mixing, and then after secondary heating by the flow electric heater, it flows out from the water outlet 12 of the energy storage heat exchange electric water heater.

[0066] In the embodiment provided in the present application, the heat exchanger 200 is preferably a stainless steel heat exchange pipe, which can be immersed in the liquid in the water tank 100. In other embodiments, the heat exchanger 200 can also be a plate structure that is currently known or can be realized in the future.

[0067] In some embodiments, the energy storage electric heater 300 may be disposed at the bottom of the water tank 100 to further improve the heating efficiency and the heat of the liquid in the water tank 100 , and to ensure the uniformity of the liquid temperature.

[0068] In some embodiments, a shell 700 may be provided outside the water tank 100 , and a heat-insulating layer 800 may be provided between the shell 700 and the water tank 100 to keep the liquid in the water tank 100 warm.

[0069] Among them, the thermal insulation layer 800 can be foamed material, EPS (polystyrene foam), rubber and plastic wool, vacuum insulation board, glass fiber wool, etc.

[0070] Based on the energy storage heat exchange electric water heater 10 mentioned in the above embodiment, the present application also provides a control method of the energy storage heat exchange electric water heater 10, see Figure 2 , the method comprises the following steps:

[0071] Step 110: Use the energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm.

[0072] Step 120: using the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water with a first preset temperature value.

[0073] The first preset temperature value may be any value between 20°C and 33°C, such as 20°C, 25°C, 28°C, etc.

[0074] Step 130: Obtain the water flow signal value of the energy storage heat exchange electric water heater.

[0075] Step 140: Determine whether the water flow signal value meets the first preset trigger requirement.

[0076] Step 150: If the water flow signal value meets the first preset trigger requirement, water with a first preset temperature value in the heat exchanger is output to the thermostatic valve.

[0077] Step 160: Control the over-flow electric heater and the thermostatic valve to be in a start-up working state at the same time, and use the thermostatic valve to mix the water of the first preset temperature value with the cold water input from the water inlet to obtain mixed water.

[0078] Step 170: using an over-flow electric heater to heat the mixed water output by the thermostatic valve to a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value.

[0079] The second preset temperature value is greater than the first preset temperature value. For example, the second preset temperature value may be any value between 35°C and 48°C, such as 38°C, 40°C, 45°C, and the like.

[0080] Since the existing relevant practice is to start the over-flow electric heater first, and then start the thermostatic valve after a period of time, this will cause the thermostatic valve to input cold water into the over-flow electric heater during the extended period of time, and the temperature rise value that the over-flow electric heater can achieve is generally fixed, that is, the over-flow electric heater heats the cold water input by the thermostatic valve to a temperature lower than the second preset temperature value. When the thermostatic valve is started, the over-flow electric heater heats the mixed water input by the thermostatic valve to reach the second preset temperature value. Therefore, the over-flow electric heater will mix the part of water that is lower than the second preset temperature value with the part of water that reaches the second preset temperature value, resulting in the water temperature that finally flows out of the over-flow electric heater not meeting the user's requirements, requiring the user to wait for a period of time after boiling the water before using the water, which increases the time it takes for the user to use the water from boiling the water.

[0081] Therefore, this embodiment controls the flow-through electric heater and the thermostatic valve to be in the starting working state at the same time, so that the thermostatic valve can mix the cold water with the hot water output by the heat exchanger and then flow through the flow-through electric heater for heating. That is, the flow-through electric heater can directly heat the mixed water output by the thermostatic valve without heating the cold water of the thermostatic valve. Therefore, the water temperature output by the flow-through electric heater after heating the mixed water can reach the second preset temperature value relatively quickly, that is, reach the water temperature required by the user. Therefore, it helps to reduce the time from turning on the water to using the water, and shorten the time the user waits for water and the constant temperature time.

[0082] In addition, this embodiment adopts a segmented heating method, first using the energy storage electric heater in the water tank to heat the water temperature in the electric heater to a lower preset value such as a first preset temperature value. When the user needs water, the electric heater can immediately output hot water to the thermostatic valve, and then use the over-flow electric heater to heat it again. In this way, the energy storage heat exchange electric water heater can start outputting hot water at the initial stage of heating, and there is no need to wait for the water temperature in the energy storage heat exchange electric water heater to fully reach the preset value before outputting it. The electric energy consumed in the heating process can be converted into hot water for actual use more quickly, reducing the energy waste caused by the water temperature not reaching the preset value. At the same time, users can obtain the required hot water in a shorter time, thereby improving the user experience.

[0083] Referring to the second embodiment of a control method for an energy storage heat exchange electric water heater provided in the present application, the method comprises the following steps:

[0084] Step 210: Using the energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm.

[0085] Step 220: Use the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water with a first preset temperature value.

[0086] Step 230: Obtain the water flow signal value of the energy storage heat exchange electric water heater.

[0087] Step 240: Determine whether the water flow signal value is greater than a preset water flow value.

[0088] Among them, whether the water flow signal value is greater than the preset water flow value can represent whether the user is in a bathing state, and the preset water flow value can be in the range of 0.5L / min-2.5L / min.

[0089] Step 250: If the water flow signal value is greater than the preset water flow value, it is determined that the water flow signal value meets the first preset trigger requirement, and the over-flow electric heater is controlled to be in a start-up working state.

[0090] Referring to the third embodiment of a control method for an energy storage heat exchange electric water heater provided in the present application, the method comprises the following steps:

[0091] Step 310: Use the energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm.

[0092] Step 320: Use the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water with a first preset temperature value.

[0093] Step 330: Obtain the water flow signal value of the energy storage heat exchange electric water heater.

[0094] Step 340: Determine whether the water flow signal value meets the first preset trigger requirement.

[0095] Step 350: If the water flow signal value meets the first preset trigger requirement, water with a first preset temperature value in the heat exchanger is output to the thermostatic valve.

[0096] Step 360: Obtain the outlet water temperature of the thermostatic valve.

[0097] Since the thermostatic valve is not opened at this time, the outlet water temperature of the thermostatic valve is the temperature of cold water.

[0098] Step 370: Determine whether the outlet water temperature meets the second preset trigger requirement.

[0099] In some implementations, determining whether the water temperature meets the second preset trigger requirement includes:

[0100] Step 371: Obtain a preset temperature rise value of the over-current electric heater.

[0101] Among them, the preset temperature rise value is a theoretical temperature rise value.

[0102] Step 372: Determine the temperature difference between the second preset temperature value and the preset temperature rise value.

[0103] Step 373: Determine whether the outlet water temperature is greater than or equal to the temperature difference.

[0104] Step 374: If the outlet water temperature is greater than or equal to the temperature difference, it is determined that the outlet water temperature meets the second preset trigger requirement.

[0105] Step 380: If the outlet water temperature meets the second preset trigger requirement, the over-flow electric heater and the thermostatic valve are controlled to be in the start-up working state at the same time, and the thermostatic valve is used to mix the water of the first preset temperature value with the cold water input from the water inlet to obtain mixed water.

[0106] Step 390: using an over-flow electric heater to heat the mixed water output by the thermostatic valve to a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value.

[0107] Referring to the fourth embodiment of a control method for an energy storage heat exchange electric water heater provided by the present application, the method comprises the following steps:

[0108] Step 410: using the energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm;

[0109] Step 420: using the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water of a first preset temperature value;

[0110] Step 430: Obtaining a water flow signal value of the energy storage heat exchange electric water heater;

[0111] Step 440: Determine whether the water flow signal value meets the first preset trigger requirement.

[0112] Step 450: If the water flow signal value meets the first preset trigger requirement, the over-flow electric heater is controlled to be in a start-up working state.

[0113] Step 460: If the water flow signal value does not meet the first preset trigger requirement, the water tank temperature in the energy storage heat exchange electric water heater is obtained.

[0114] Step 470: Determine whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement.

[0115] Step 480: If the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement, the energy storage electric heater is controlled to be in a start-up working state.

[0116] Wherein, step 470 includes the following steps:

[0117] Step 471: Determine the target set temperature of the energy storage heat exchange electric water heater.

[0118] Step 472: Determine whether the water tank temperature in the energy storage heat exchange electric water heater is less than or equal to the target set temperature.

[0119] Step 473: If the water tank temperature in the energy storage heat exchange electric water heater is less than or equal to the target set temperature, it is determined that the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement.

[0120] In some implementations, step 471, i.e. determining a target set temperature of the energy storage heat exchange electric water heater, includes:

[0121] Step 4711: Obtain the initial set temperature and hysteresis temperature of the energy storage heat exchange electric water heater.

[0122] Among them, the initial setting temperature T 1S It is generally set to 55℃-85℃, and the hysteresis temperature T0 is generally set to 5℃-10℃.

[0123] Step 4712: Based on the difference between the initial set temperature and the return temperature, the target set temperature of the energy storage heat exchange electric water heater is obtained.

[0124] That is, the target setting temperature = the initial setting temperature T 1S -The difference in hysteresis temperature T0.

[0125] Referring to the fifth embodiment of a control method for an energy storage heat exchange electric water heater provided by the present application, the method comprises the following steps:

[0126] Step 510: using the energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm;

[0127] Step 520: using the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water of a first preset temperature value;

[0128] Step 530: Obtaining a water flow signal value of the energy storage heat exchange electric water heater;

[0129] Step 540: Determine whether the water flow signal value meets the first preset trigger requirement.

[0130] Step 550: If the water flow signal value meets the first preset trigger requirement, the over-flow electric heater is controlled to be in a start-up working state.

[0131] Step 560: If the water flow signal value does not meet the first preset trigger requirement, the water tank temperature in the energy storage heat exchange electric water heater is obtained.

[0132] Step 570: Determine whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement.

[0133] Step 580: If the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement, the energy storage electric heater is controlled to be in a start-up working state.

[0134] Step 590: If the water tank temperature in the energy storage heat exchange electric water heater does not meet the third preset trigger requirement, the energy storage electric heater is controlled to be in an off working state.

[0135] Based on the above embodiments, combined with Figure 3 The control method of the energy storage heat exchange electric water heater provided in this application mainly includes the following steps:

[0136] Step 10: Determine whether the water flow signal value is greater than the preset water flow value Q1.

[0137] If yes, go to step 11, if no, go to step 21.

[0138] Step 11: Determine whether the outlet water temperature of the thermostatic valve is greater than or equal to |Tsc-2|-Twc.

[0139] That is, determine whether the outlet water temperature is greater than or equal to the temperature difference.

[0140] Among them, |Tsc-2| is the range of the second preset temperature value, that is, the preset temperature of the water outlet, Twc is the preset temperature rise value of the over-flow electric heater, and |Tsc-2|-Twc is the temperature difference.

[0141] If yes, go to step 12, if no, go to step 13.

[0142] Step 12: Control the over-current electric heater to be in a start-up working state, and at the same time control the thermostatic valve to be in a start-up working state.

[0143] Step 13: Thermostatic valve does not activate.

[0144] Step 21: Determine whether the temperature sensor T1 is less than or equal to T 1S - Hysteresis temperature T0.

[0145] Among them, T 1S is the initial set temperature, T 1S - The hysteresis temperature T0 is the target set temperature, that is, it is determined whether the temperature sensor T1 is less than or equal to the target set temperature. If so, step 22 is executed, if not, step 23 is executed.

[0146] Step 22: The energy storage electric heater is started.

[0147] Step 23: The energy storage electric heater does not start.

[0148] Among them, after the thermostatic valve is started in step 13 and the energy storage electric heater is started in step 22, return to step 10.

[0149] For steps 10 to 23, that is, when the user uses water, the water flow sensor reads a water flow signal value > Q1, which means that the user is in a bathing state. At this time, the overflow electric heater and the thermostatic valve are turned on at the same time, and the overflow electric heater starts to heat the mixed water output by the thermostatic valve.

[0150] Since the temperature sensor T3 is set between the end of the thermostatic valve and the overflow electric heater, it is used to read the outlet water temperature after the thermostatic valve is set to a constant temperature. Therefore, the "temperature at the water heater outlet" = "the temperature at the position of the temperature sensor T3" + "the temperature rise value generated by the overflow electric heater".

[0151] Among them, the temperature rise value generated by the over-current electric heater can be calculated in advance, specifically using the following formula 1:

[0152] , Formula 1.

[0153] in, represents the electrical energy generated; Represents the temperature energy change caused by the temperature rise generated by electrical energy; Represents the power conversion efficiency, generally 92%~99%; Represents the power of the over-current electric heater, and the conventional value is 3000W~5500W; t represents the unit time, which can be understood as 1 minute here; represents the specific heat capacity of water, 4.2X10³ J / (kg·℃); Represents the mass of water flowing through the over-flow electric heater per unit time, which is equivalent to the water flow rate and can be read by the water flow sensor at the water inlet; Represents the temperature rise that can be produced by an over-current electric heater.

[0154] By arranging a thermostatic valve between the over-flow electric heater and the heat exchanger, the thermostatic valve mixes the hot water output from the heat exchanger with the cold water input from the water inlet and keeps the mixture at a constant temperature before the mixture flows through the over-flow electric heater. In this way, the stability of the water temperature input into the over-flow electric heater can be improved, so that after heating, the over-flow electric heater can output water at a stable temperature for use by users.

[0155] When the user does not use water, that is, when the water flow sensor reads a water flow signal value ≤ Q1, if the water tank temperature does not reach the target set temperature (that is, the value read by the water tank temperature sensor T1 is less than the set temperature T 1S - hysteresis temperature T0), the energy storage electric heater is started to heat the liquid in the water tank for energy storage.

[0156] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0157] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain", and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof.

[0158] The above is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A control method for an energy storage heat exchange electric water heater, characterized in that: The energy storage heat exchange electric water heater comprises a water tank, an energy storage electric heater, a heat exchanger, an overflow electric heater and a thermostatic valve, wherein the energy storage electric heater and the heat exchanger are arranged in the water tank, the overflow electric heater and the thermostatic valve are arranged outside the water tank, and the thermostatic valve is connected to the outlet of the heat exchanger, the overflow electric heater, and the water inlet of the energy storage heat exchange electric water heater; the method comprises: Using the energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm; Using the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water with a first preset temperature value; Obtaining a water flow signal value of the energy storage heat exchange electric water heater; Determining whether the water flow signal value meets a first preset trigger requirement; If the water flow signal value meets the first preset trigger requirement, water of a first preset temperature value in the heat exchanger is output to the thermostatic valve; Controlling the overflow electric heater and the thermostatic valve to be in a startup working state at the same time, and using the thermostatic valve to mix the water of the first preset temperature value with the cold water input from the water inlet to obtain mixed water; Using the overflow electric heater to heat the mixed water output by the thermostatic valve to a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value; Before controlling the overflow electric heater and the thermostatic valve to be in a startup working state at the same time, the method further includes: Obtaining the outlet water temperature of the thermostatic valve; Determining whether the outlet water temperature meets a second preset trigger requirement; If the outlet water temperature meets the second preset trigger requirement, the over-current electric heater and the thermostatic valve are controlled to be in a start-up working state at the same time; Wherein, the step of judging whether the outlet water temperature meets the second preset trigger requirement includes: Obtaining a preset temperature rise value of the over-current electric heater; Determining a temperature difference between the second preset temperature value and the preset temperature rise value; Determining whether the outlet water temperature is greater than or equal to the temperature difference; If the outlet water temperature is greater than or equal to the temperature difference, it is determined that the outlet water temperature meets the second preset trigger requirement.

2. The control method of the energy storage heat exchange electric water heater according to claim 1, characterized in that: The determining whether the water flow signal value meets the first preset trigger requirement includes: Determining whether the water flow signal value is greater than a preset water flow value; If the water flow signal value is greater than the preset water flow value, it is determined that the water flow signal value meets the first preset trigger requirement.

3. The control method of the energy storage heat exchange electric water heater according to claim 1, characterized in that: The step of determining whether the water flow signal value meets the first preset trigger requirement further includes: If the water flow signal value does not meet the first preset trigger requirement, obtaining the water tank temperature in the energy storage heat exchange electric water heater; Determining whether the water tank temperature in the energy storage heat exchange electric water heater meets a third preset trigger requirement; If the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement, the energy storage electric heater is controlled to be in a start-up working state.

4. The control method of the energy storage heat exchange electric water heater according to claim 3, characterized in that: The determining whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement includes: Determining a target set temperature of the energy storage heat exchange electric water heater; Determining whether the water tank temperature in the energy storage heat exchange electric water heater is less than or equal to the target set temperature; If the water tank temperature in the energy storage heat exchange electric water heater is less than or equal to the target set temperature, it is determined that the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement.

5. The control method of the energy storage heat exchange electric water heater according to claim 4, characterized in that: Determining the target set temperature of the energy storage heat exchange electric water heater includes: Obtaining the initial set temperature and hysteresis temperature of the energy storage heat exchange electric water heater; Based on the difference between the initial set temperature and the return temperature, a target set temperature of the energy storage heat exchange electric water heater is obtained.

6. The control method of the energy storage heat exchange electric water heater according to claim 3, characterized in that: The step of determining whether the water tank temperature in the energy storage heat exchange electric water heater meets the third preset trigger requirement also includes: If the water tank temperature in the energy storage heat exchange electric water heater does not meet the third preset trigger requirement, the energy storage electric heater is controlled to be in an off-working state.

7. A control device for an energy storage heat exchange electric water heater, characterized in that: The control device comprises: an energy storage heat exchange electric water heater and a controller, wherein the controller is used to execute the steps of the method according to any one of claims 1 to 6; The energy storage heat exchange electric water heater comprises a water tank, a heat exchanger, an energy storage electric heater, a flow-through electric heater, a thermostatic valve, a water flow sensor, a first temperature sensor and a second temperature sensor; Wherein, the energy storage electric heater is arranged in the water tank; The heat exchanger and the first temperature sensor are arranged in the water tank; The second temperature sensor is arranged between the thermostatic valve and the overflow electric heater; The thermostatic valve is connected to the outlet of the heat exchanger, the overflow electric heater, and the water inlet of the energy storage heat exchange electric water heater; The over-flow electric heater is connected to the water outlet of the energy storage heat exchange electric water heater; The inlet of the heat exchanger is connected to the water inlet of the energy storage heat exchange electric water heater.

8. The control device of the energy storage heat exchange electric water heater according to claim 7, characterized in that: The heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchange structure.

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