Control method and device of energy storage heat exchange type electric water heater

Abstract

The invention provides a control method and device for an energy storage heat exchange type electric water heater. The method comprises the steps that liquid in a water tank is preliminarily heated to a first preset temperature value through the energy storage electric heater, and heat preservation is conducted; the heated liquid in the water tank is used for conducting heat exchange on the water in the heat exchanger, and water with the first preset temperature value is obtained; acquiring a water flow signal value of the energy storage heat exchange type electric water heater; judging whether the water flow signal value meets a first preset triggering requirement or not; if the water flow signal value meets the first preset triggering requirement, water with the first preset temperature value in the heat exchanger is output; and the overflowing type electric heater is controlled to be in a starting working state, the overflowing type electric heater is used for heating the water with the first preset temperature value output by the heat exchanger to a second preset temperature value, and the second preset temperature value is larger than the first preset temperature value. According to the energy storage and heat exchange type electric water heater, the energy loss of the electric water heater can be reduced, and the heating efficiency of the electric water heater is improved.

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] Traditional electric water heaters heat the energy storage heater in the inner tank to make the water temperature meet the user's needs, thereby outputting hot water. However, during the heating process, if the water temperature in the electric water heater fails to reach a certain preset fixed value, even if the energy storage heater has started working, the electric water heater cannot provide hot water to the user. This means that during the heating period, although the energy storage heater has started heating, the water temperature after heating has not reached the preset fixed value, resulting in the inability to immediately output hot water from the electric water heater to supply the user, so that the electric energy consumed during the heating process is not immediately converted into usable hot water, resulting in energy waste, thereby reducing the heating efficiency of the electric water heater. 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 energy loss of the electric water heater and improve the heating efficiency of the electric water heater.

[0004] In a first aspect, the present application provides a control method for an energy storage heat exchange electric water heater, the energy storage heat exchange electric water heater comprising a water tank, an energy storage electric heater, a heat exchanger, and a flow-through electric heater, the energy storage electric heater and the heat exchanger being arranged in the water tank, and the flow-through electric heater being arranged outside the water tank, the method comprising:

[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;

[0010] The over-flow electric heater is controlled to be in a start-up working state, and the over-flow electric heater is used to heat water of a first preset temperature value output by the heat exchanger to a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value.

[0011] A further technical solution is to determine whether the water flow signal value meets the first preset trigger requirement, including:

[0012] Determine whether the water flow signal value is greater than the preset water flow value;

[0013] 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.

[0014] A further technical solution is that after controlling the over-current electric heater to start working, the method further includes:

[0015] Within a preset delay time period, obtaining the outlet water temperature after being heated by the over-current electric heater;

[0016] Determining whether the outlet water temperature meets a second preset trigger requirement;

[0017] If the outlet water temperature meets the second preset trigger requirement, the thermostatic valve is controlled to be in a start-up working state.

[0018] A further technical solution is to determine whether the outlet water temperature meets the second preset trigger requirement, including:

[0019] Determining whether the outlet water temperature is greater than or equal to a second preset temperature value;

[0020] If the outlet water temperature is greater than or equal to the second preset temperature value, it is determined that the outlet water temperature meets the second preset trigger requirement.

[0021] A further technical solution is to determine whether the water flow signal value meets the first preset trigger requirement, and further include:

[0022] If the water flow signal value does not meet the first preset trigger requirement, obtaining the water tank temperature in the electric water heater;

[0023] Determining whether the water tank temperature in the electric water heater meets a third preset trigger requirement;

[0024] If the water tank temperature in the electric water heater meets the third preset trigger requirement, the energy storage electric heater is controlled to be in a start-up working state.

[0025] A further technical solution is to determine whether the water tank temperature in the electric water heater meets a third preset trigger requirement, including:

[0026] Determine the target set temperature for the electric water heater;

[0027] Determine whether the water tank temperature in the electric water heater is less than or equal to the target set temperature;

[0028] If the water tank temperature in the electric water heater is less than or equal to the target set temperature, it is determined that the water tank temperature in the electric water heater meets the third preset trigger requirement.

[0029] A further technical solution is to determine the target set temperature of the electric water heater, including:

[0030] Get the initial set temperature and hysteresis temperature of the electric water heater;

[0031] Based on the difference between the initial set temperature and the hysteresis temperature, the target set temperature of the electric water heater is obtained.

[0032] A further technical solution is to determine whether the water tank temperature in the electric water heater meets the third preset trigger requirement, and further include:

[0033] If the water tank temperature in the 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.

[0034] 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;

[0035] 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;

[0036] Wherein, the energy storage electric heater is arranged in the water tank;

[0037] The heat exchanger and the first temperature sensor are arranged in the water tank;

[0038] The over-current electric heater is arranged between the thermostatic valve and the second temperature sensor;

[0039] The thermostatic valve is connected to the outlet of the heat exchanger, the water inlet and the water outlet of the energy storage heat exchange electric water heater;

[0040] The inlet of the heat exchanger is connected to the water inlet of the energy storage heat exchange type electric water heater.

[0041] A further technical solution is that the heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchange structure.

[0042] The beneficial effect of the present application is as follows: different from the prior art, the present application utilizes an energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm; and utilizes the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water of the first preset temperature value. Therefore, when the acquired 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, and the over-flow electric heater is used to heat the water of the first preset temperature value output by the heat exchanger to a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value. That is to say, a segmented heating method is adopted, and the energy storage electric heater in the water tank is first used to heat the water temperature in the electric heater to a lower preset value such as the first preset temperature value. When the user needs water, the electric heater can immediately output hot water, and the over-flow electric heater is used to further heat the water output by the electric water heater so that the water temperature reaches the second preset temperature value that meets the customer's needs, and then it is provided to the user for use.

[0043] In this way, since the electric water heater can start outputting hot water at the initial stage of heating, there is no need to wait for the water temperature in the electric water heater to reach the preset value before outputting it. As a result, the electric energy consumed in the heating process can be converted into hot water for actual use more quickly, reducing 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] 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:

[0045] Figure 1 A schematic structural diagram of an embodiment of an energy storage heat exchange electric water heater provided in this application;

[0046] 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;

[0047] Figure 3 A schematic flow chart of another embodiment of the water temperature control method for the energy storage heat exchange electric water heater provided in the present application.

[0048] Description of Figure Numbers:

[0049] 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

[0050] 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.

[0051] 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.

[0052] Traditional electric water heaters heat the energy storage heater in the inner tank to make the water temperature meet the user's needs, thereby outputting hot water. However, during the heating process, if the water temperature in the electric water heater fails to reach a certain preset fixed value, even if the energy storage heater has started working, the electric water heater cannot provide hot water to the user. This means that during the heating period, although the energy storage heater has started heating, the water temperature after heating has not reached the preset fixed value, resulting in the inability to immediately output hot water from the electric water heater to supply the user, so that the electric energy consumed during the heating process is not immediately converted into usable hot water, resulting in energy waste, thereby reducing the heating efficiency of the electric water heater.

[0053] 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 improve the heating efficiency of the electric water heater. Please refer to the following embodiments for details.

[0054] like Figure 1As 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] The thermostatic valve 500 is arranged outside the water tank 100, connected to the outlet of the heat exchanger 200, the water inlet 11 and the water outlet 12 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.

[0059] The overflow electric heater 400 is disposed between the thermostatic valve 500 and the second temperature sensor 102 , i.e., at the end of the thermostatic valve 500 , and is used to perform secondary heating on the thermostatic water coming out of the thermostatic valve 500 to reach the bathing water temperature.

[0060] The second temperature sensor 102 is disposed at the end of the over-current electric heater 400 and is used to read the outlet water temperature during bathing.

[0061] In some embodiments, a water flow sensor may be disposed at the main water inlet 11 or the water outlet 12 of the electric water heater to read the water flow rate entering the electric water heater.

[0062] Specifically, in this embodiment, water flows into the water inlet 11 of the 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 heater, flow out from the water outlet 12.

[0063] 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.

[0064] In some embodiments, a thermal storage heater 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.

[0065] 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.

[0066] 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.

[0067] Based on the energy storage heat exchange electric water heater 10 mentioned in the above embodiment, the present application also provides a water temperature control method of the energy storage heat exchange electric water heater 10, see Figure 2 , the method comprises the following steps:

[0068] 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.

[0069] 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.

[0070] The first preset temperature value may be any value between 20°C and 33°C, such as 20°C, 25°C, 28°C, etc.

[0071] Step 130: Obtain the water flow signal value of the energy storage heat exchange electric water heater.

[0072] Step 140: Determine whether the water flow signal value meets the first preset trigger requirement.

[0073] 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.

[0074] Step 160: Control the over-flow electric heater to be in a start-up working state, and use the over-flow electric heater to heat the water of the first preset temperature value output by the heat exchanger to a second preset temperature value.

[0075] 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.

[0076] This embodiment uses an energy storage electric heater to preliminarily heat the liquid in the water tank to a first preset temperature value and keep it warm; and uses the heated liquid in the water tank to exchange heat with the water in the heat exchanger to obtain water of the first preset temperature value. Therefore, when the acquired 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, and the over-flow electric heater is used to heat the water of the first preset temperature value output by the heat exchanger to a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value. That is to say, a segmented heating method is adopted, and the energy storage electric heater in the water tank is first used to heat the water temperature in the electric heater to a lower preset value such as the first preset temperature value. When the user needs water, the electric heater can immediately output hot water, and the over-flow electric heater is used to further heat the water output by the electric water heater so that the water temperature reaches the second preset temperature value that meets the customer's needs, and then it is provided to the user for use.

[0077] In this way, since the electric water heater can start outputting hot water at the initial stage of heating, there is no need to wait for the water temperature in the electric water heater to reach the preset value before outputting it. As a result, the electric energy consumed in the heating process can be converted into hot water for actual use more quickly, reducing 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.

[0078] Referring to the second embodiment of a water temperature control method for an energy storage heat exchange electric water heater provided in the present application, the method comprises the following steps:

[0079] 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.

[0080] 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.

[0081] Step 230: Obtain the water flow signal value of the energy storage heat exchange electric water heater.

[0082] Step 240: Determine whether the water flow signal value is greater than a preset water flow value.

[0083] Among them, whether the water flow signal value is greater than the preset water flow value can represent that 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.

[0084] 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.

[0085] Referring to the third embodiment of a water temperature control method for an energy storage heat exchange electric water heater provided in the present application, the method comprises the following steps:

[0086] 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.

[0087] 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.

[0088] Step 330: Obtain the water flow signal value of the energy storage heat exchange electric water heater.

[0089] Step 340: Determine whether the water flow signal value meets the first preset trigger requirement.

[0090] Step 350: 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.

[0091] Step 360: within a preset delay period, obtaining the outlet temperature of water after being heated by the over-flow electric heater.

[0092] The preset delay time period may be in the range of 5s to 30s.

[0093] Step 370: Determine whether the outlet water temperature meets the second preset trigger requirement.

[0094] Step 380: If the outlet water temperature meets the second preset trigger requirement, the thermostatic valve is controlled to be in a start-up working state.

[0095] In some implementations, determining whether the water temperature meets the second preset trigger requirement includes:

[0096] Step 351: Determine whether the outlet water temperature is greater than or equal to a second preset temperature value;

[0097] Step 352: If the outlet water temperature is greater than or equal to the second preset temperature value, it is determined that the outlet water temperature meets the second preset trigger requirement.

[0098] Referring to the fourth embodiment of a water temperature control method for an energy storage heat exchange electric water heater provided in the present application, the method comprises the following steps:

[0099] 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;

[0100] 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;

[0101] Step 430: Obtaining a water flow signal value of the energy storage heat exchange electric water heater;

[0102] Step 440: Determine whether the water flow signal value meets the first preset trigger requirement.

[0103] 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.

[0104] Step 460: If the water flow signal value does not meet the first preset trigger requirement, the water tank temperature in the electric water heater is obtained.

[0105] Step 470: Determine whether the water tank temperature in the electric water heater meets the third preset trigger requirement.

[0106] Step 480: If the water tank temperature in the electric water heater meets the third preset trigger requirement, the energy storage electric heater is controlled to be in a start-up working state.

[0107] Wherein, step 470 includes the following steps:

[0108] Step 471: Determine the target set temperature of the electric water heater.

[0109] Step 472: Determine whether the water tank temperature in the electric water heater is less than or equal to the target set temperature.

[0110] Step 473: If the water tank temperature in the electric water heater is less than or equal to the target set temperature, it is determined that the water tank temperature in the electric water heater meets the third preset trigger requirement.

[0111] In some embodiments, step 471, i.e., determining a target set temperature of the electric water heater, includes:

[0112] Step 4711: Obtain the initial set temperature and hysteresis temperature of the electric water heater.

[0113] 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℃.

[0114] Step 4712: Based on the difference between the initial set temperature and the hysteresis temperature, obtain the target set temperature of the electric water heater.

[0115] That is, the target setting temperature = initial setting temperature T 1S -The difference in hysteresis temperature T0.

[0116] Referring to the fifth embodiment of a water temperature control method for an energy storage heat exchange electric water heater provided in the present application, the method comprises the following steps:

[0117] 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;

[0118] 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;

[0119] Step 530: Obtaining a water flow signal value of the energy storage heat exchange electric water heater;

[0120] Step 540: Determine whether the water flow signal value meets the first preset trigger requirement.

[0121] 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.

[0122] Step 560: If the water flow signal value does not meet the first preset trigger requirement, the water tank temperature in the electric water heater is obtained.

[0123] Step 570: Determine whether the water tank temperature in the electric water heater meets the third preset trigger requirement.

[0124] Step 580: If the water tank temperature in the electric water heater meets the third preset trigger requirement, the energy storage electric heater is controlled to be in a start-up working state.

[0125] Step 590: If the water tank temperature in the 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.

[0126] 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:

[0127] Step 10: Check whether the water flow signal is greater than Q1.

[0128] That is, it is determined whether the water flow signal value is greater than the preset water flow value Q1.

[0129] If yes, go to step 11, if no, go to step 21.

[0130] Step 11: Start the over-current electric heater.

[0131] That is, the over-current electric heater is started and controlled to be in a starting working state.

[0132] Step 12: Delay t0.

[0133] Among them, the delay can be 5s to 30s.

[0134] Step 13: Determine whether the outlet water temperature T3 is greater than or equal to |T3-2|.

[0135] Wherein, |T3-2| is a second preset temperature value.

[0136] If yes, go to step 14, if no, go to step 15.

[0137] Step 14: Thermostatic valve starts.

[0138] Step 15: Thermostatic valve does not activate.

[0139] Step 21: Determine whether the temperature sensor T1 is less than or equal to T 1S - Hysteresis temperature T0.

[0140] 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.

[0141] Step 22: The energy storage electric heater is started.

[0142] Step 23: The energy storage electric heater does not start.

[0143] Among them, after the thermostatic valve is started in step 14 and the energy storage electric heater is started in step 22, return to step 10.

[0144] Regarding 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 over-flow electric heater starts to heat the mixed water flowing through it.

[0145] Since it takes some time for the over-flow electric heater to increase from 0 power to peak power, the present application provides a delay t0 after the over-flow electric heater starts heating. The purpose is to stabilize the power output of the over-flow heater (that is, the temperature rise output by the over-flow heater is stable) before starting the thermostatic valve to avoid the thermostatic function of the thermostatic valve being affected by the over-flow heater and continuously increasing the T3 water temperature, causing the thermostatic valve to repeatedly adjust the temperature according to different real-time readings.

[0146] Based on this, in the present application, the thermostatic valve is used to maintain the temperature at the position of the thermostat temperature sensor T3, so that the temperature at the position of the temperature sensor T3 reaches |T3-2| (that is, reaches the set temperature within ±2°C), that is, to achieve the purpose of constant temperature.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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, and an over-flow electric heater. The energy storage electric heater and the heat exchanger are arranged in the water tank, and the over-flow electric heater is arranged outside the water tank. 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; The over-flow electric heater is controlled to be in a start-up working state, and the over-flow electric heater is used to heat water of a first preset temperature value output by a heat exchanger to a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value.

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: After the control of the over-flow electric heater starts working, the method further includes: Within a preset delay time period, obtaining the outlet temperature of water after being heated by the over-current electric heater; Determining whether the outlet water temperature meets a second preset trigger requirement; If the outlet water temperature meets the second preset trigger requirement, the thermostatic valve 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 outlet water temperature meets the second preset trigger requirement includes: Determining whether the outlet water temperature is greater than or equal to a second preset temperature value; If the outlet water temperature is greater than or equal to the second preset temperature value, it is determined that the outlet water temperature meets the second preset trigger requirement.

5. 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 electric water heater; Determining whether the water tank temperature in the electric water heater meets a third preset trigger requirement; If the water tank temperature in the electric water heater meets the third preset trigger requirement, the energy storage electric heater is controlled to be in a start-up working state.

6. The control method of the energy storage heat exchange electric water heater according to claim 5, characterized in that: The determining whether the water tank temperature in the electric water heater meets the third preset trigger requirement includes: determining a target set temperature of the electric water heater; Determining whether the water tank temperature in the electric water heater is less than or equal to a target set temperature; If the water tank temperature in the electric water heater is less than or equal to the target set temperature, it is determined that the water tank temperature in the electric water heater meets the third preset trigger requirement.

7. The control method of the energy storage heat exchange electric water heater according to claim 6, characterized in that: Determining the target set temperature of the electric water heater includes: Obtaining the initial set temperature and the return temperature of the electric water heater; Based on the difference between the initial setting temperature and the return temperature, a target setting temperature of the electric water heater is obtained.

8. The control method of the energy storage heat exchange electric water heater according to claim 5, characterized in that: The step of determining whether the water tank temperature in the electric water heater meets the third preset trigger requirement also includes: If the water tank temperature in the 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.

9. 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 perform the steps of any method according to claim 1-8; 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 overflow electric heater is arranged between the thermostatic valve and the second temperature sensor; The thermostatic valve is connected to the outlet of the heat exchanger, the water inlet and 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.

10. The control device of the energy storage heat exchange electric water heater according to claim 9, characterized in that: The heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchange structure.

Images