Heat exchange type electric water heater and water temperature control method of heat exchange type electric water heater

Abstract

The application provides a heat exchange type electric water heater and a water temperature control method of the heat exchange type electric water heater. The heat exchange type electric water heater comprises a heat exchange box, a heat exchanger, a heat storage heater, an instant heater, a reversing valve and a water mixing valve. The heat exchange box is an open box. The heat exchange type electric water heater is provided with a first water inlet and a first water outlet, and the heat exchanger is provided with a second water inlet and a second water outlet. The heat storage heater is arranged in the heat exchange box. The heat exchanger is located in the heat exchange box. The instant heater is arranged between the reversing valve and the second water inlet. The reversing valve is connected to the first water inlet, the instant heater and the water mixing valve. The water mixing valve is connected to the reversing valve, the first water outlet and the second water outlet. The heat exchange type electric water heater can improve the stability of the water outlet temperature of the heat exchange type electric water heater.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and in particular to heat exchange electric water heaters and a method for controlling the water temperature of heat exchange electric water heaters. Background Technology

[0002] Because storage-type electric water heaters produce stagnant water, which can breed bacteria, accumulate impurities, and withstand high pressure, while instantaneous water heaters suffer from problems such as excessive power consumption and insufficient hot water output, the market is gradually shifting towards heat exchange-type electric water heaters.

[0003] Current heat exchange type electric water heaters are equipped with a heat exchanger, a thermostatic valve, and a heating module located at the output end of the thermostatic valve. The heat exchanger exchanges heat with the input cold water and outputs it to the thermostatic valve. The heating module then heats the water output from the thermostatic valve and provides it to the user. However, the heating module is susceptible to voltage fluctuations, which can cause power variations and lead to unstable final water temperature. Summary of the Invention

[0004] This application provides a heat exchange electric water heater that can improve the stability of the outlet water temperature.

[0005] In a first aspect, this application provides a heat exchange electric water heater, which includes a heat exchange tank, a heat exchanger, a thermal storage heater, an instantaneous heater, a reversing valve, and a mixing valve, wherein the heat exchange tank is an open tank; the heat exchange electric water heater is provided with a first inlet and a first outlet, and the heat exchanger is provided with a second inlet and a second outlet.

[0006] The heat storage heater is installed inside the heat exchange box;

[0007] The heat exchanger is located inside the heat exchange chamber;

[0008] The instantaneous heater is located between the reversing valve and the second water inlet;

[0009] The reversing valve is connected to the first water inlet, the instant heater, and the mixing valve;

[0010] The mixing valve is connected to the reversing valve, the first outlet, and the second outlet.

[0011] A further technical solution is that the heat exchanger body is provided with an air chamber, a liquid inlet pipe, an open liquid outlet pipe and an exhaust port; wherein, the air chamber is located at the top of the heat exchanger body, the liquid inlet pipe is connected to the reversing valve, and the open liquid outlet pipe extends to the bottom of the heat exchanger body and is connected to the exhaust port.

[0012] Secondly, this application provides a water temperature control method for a heat exchange electric water heater. Based on the aforementioned heat exchange electric water heater, the method includes:

[0013] A reversing valve is used to direct the water flowing out of the inlet of the heat exchange electric water heater into the first pipeline, wherein the first pipeline includes a first sub-pipeline and a second sub-pipeline.

[0014] The water at the first temperature output from the first sub-pipe flows into the mixing valve;

[0015] The water in the second sub-pipe is heated by an instant heater to obtain water at a second temperature;

[0016] Water at a second temperature is fed into a heat exchanger for heat exchange, resulting in water at a third temperature output from the heat exchanger. The heat exchange chamber contains liquid at a preset temperature.

[0017] Enter water at the third temperature into the mixing valve;

[0018] The mixing valve is used to mix water at the first temperature and water at the third temperature to obtain water at the fourth temperature output by the mixing valve.

[0019] A further technical solution is that the third temperature is less than or equal to the preset temperature.

[0020] Its further technical solution includes the following methods:

[0021] Determine the flow rate of the water at the second temperature;

[0022] The value of the second temperature is obtained based on the value of the first temperature, the specific heat capacity of water, the power of the instantaneous heater, and the flow rate of water at the second temperature.

[0023] A further technical solution involves determining the flow rate of water at the second temperature, including:

[0024] Determine the flow rate ratio between water at the first temperature and water at the third temperature;

[0025] The flow rate of water at the third temperature is obtained based on the flow rate ratio between water at the first temperature and water at the third temperature, wherein the flow rate of water at the second temperature is equal to the flow rate of water at the third temperature.

[0026] A further technical solution involves determining the flow rate ratio between water at a first temperature and water at a third temperature, including:

[0027] Determine the temperature difference between the fourth temperature and the first temperature to obtain the first temperature difference;

[0028] Determine the temperature difference between the third temperature and the first temperature to obtain the second temperature difference;

[0029] Based on the first temperature difference and the second temperature difference, the flow rate ratio between water at the first temperature and water at the third temperature is obtained.

[0030] A further technical solution involves obtaining the flow rate ratio between water at a first temperature and water at a third temperature based on a first temperature difference and a second temperature difference, including:

[0031] Determine the ratio between the first temperature difference and the second temperature difference;

[0032] The ratio between the first temperature difference and the second temperature difference is used as the flow rate ratio between water at the first temperature and water at the third temperature.

[0033] A further technical solution involves, before heating the water in the second sub-pipe through the instantaneous heater, the method further includes:

[0034] A preset liquid is introduced into the heat exchanger using the inlet pipe;

[0035] When the liquid in the heat exchange tank is heated by the heat storage heater, if the liquid in the heat exchange tank reaches the preset position, the liquid above the preset position will flow out from the exhaust port through the open liquid outlet pipe.

[0036] A further technical solution is that the heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchange structure.

[0037] The beneficial effects of this application are as follows: Unlike existing technologies, this application installs a reversing valve at the inlet (i.e., the first inlet) of the heat exchange electric water heater. A portion of the cold water flowing from the first inlet passes directly through the mixing valve, while another portion of the cold water is pre-heated by the instantaneous heater and flows into the heat exchanger. The heat exchanger then exchanges heat with this pre-heated water before outputting hot water to the mixing valve. The mixing valve then mixes the cold and hot water before providing it to the user. Since the instantaneous heater in this application is located between the reversing valve and the inlet (i.e., the second inlet) of the heat exchanger, even if the instantaneous heater is susceptible to temperature differences due to voltage fluctuations, the heat exchange tank absorbs these fluctuations during the heat exchange process, thus mitigating the water temperature fluctuations caused by voltage fluctuations and improving the stability of the final outlet water temperature.

[0038] Secondly, since the thermal storage heater has a very slow effect on the temperature of the liquid inside the heat exchange tank, it can be understood that the temperature of the liquid inside the heat exchange tank tends to be stable throughout the entire heat exchange process. Therefore, the output hot water temperature after heat exchange using the heat exchanger in the heat exchange tank is also stable. In addition, since the temperature of the cold water entering the mixing valve is almost equal to the ambient temperature, it is also basically constant. That is to say, the temperatures of both the hot and cold water entering the mixing valve are constant. Therefore, if the flow ratio of hot and cold water entering the mixing valve remains constant, the final outlet water temperature of the mixing valve can be guaranteed to remain constant. In other words, the heat exchange electric water heater provided in this application can provide users with a stable outlet water temperature, thereby improving the user experience. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0040] Figure 1 A schematic diagram of a structure of an embodiment of the heat exchange electric water heater provided in this application;

[0041] Figure 2 A schematic diagram of the heat exchange flow direction of an embodiment of the heat exchange electric water heater provided in this application;

[0042] Figure 3 A schematic diagram of the water inlet and outlet of the heat exchange tank in an embodiment of the heat exchange electric water heater provided in this application;

[0043] Figure 4 A schematic diagram of the water circuit of an embodiment of the heat exchanger in the heat exchange electric water heater provided in this application;

[0044] Figure 5 A schematic diagram of the water circuit for another embodiment of the heat exchanger in the heat exchange electric water heater provided in this application;

[0045] Figure 6 This is a schematic diagram of another embodiment of the heat exchange electric water heater provided in this application;

[0046] Figure 7 A schematic flowchart of an embodiment of the water temperature control method for a heat exchange electric water heater provided in this application.

[0047] Explanation of icon numbers:

[0048] Heat exchange type electric water heater 10, first water inlet 101, first water outlet 102, heat exchange box 100, air cavity 110, liquid inlet pipe 120, open liquid outlet pipe 130, exhaust port 140, heat exchanger 200, second water inlet 210, second water outlet 220, heat storage heater 300, instant heater 400, reversing valve 500, mixing valve 600, outer shell 700, insulation layer 800, first pipeline 900, first sub-pipeline 910, second sub-pipeline 920. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0051] Because storage-type electric water heaters produce stagnant water, which can breed bacteria, accumulate impurities, and withstand high pressure, while instantaneous water heaters suffer from problems such as excessive power consumption and insufficient hot water output, the market is gradually shifting towards heat exchange-type electric water heaters.

[0052] Current heat exchange type electric water heaters are equipped with a heat exchanger, a thermostatic valve, and a heating module located at the output end of the thermostatic valve. The heat exchanger exchanges heat with the input cold water and outputs it to the thermostatic valve. The heating module then heats the water output from the thermostatic valve and provides it to the user. However, the heating module is susceptible to voltage fluctuations, which can cause power variations and lead to unstable final water temperature.

[0053] Therefore, in order to solve the technical problem of unstable outlet water temperature in existing heat exchange electric water heaters, this application provides a heat exchange electric water heater and a corresponding water temperature control method, which can improve the stability of outlet water temperature. See the following embodiments for details.

[0054] like Figure 1As shown, the heat exchange electric water heater 10 provided in this application includes a heat exchange chamber 100, a heat exchanger 200, a thermal storage heater 300, an instantaneous heater 400, a reversing valve 500, and a mixing valve 600. The heat exchange chamber 100 can be used to store energy storage substances, such as water or oil. Since the heat exchange chamber 100 in this embodiment is an open chamber, its shape is diverse, meaning that users can flexibly adjust the shape of the heat exchange chamber 100 according to actual conditions and preferences.

[0055] The heat storage heater 300 is installed inside the heat exchange box 100 to heat the liquid inside the heat exchange box 100, so that the liquid temperature in the heat exchange box 100 is heated to a preset temperature so that it can exchange heat with the cold water in the heat exchanger 200.

[0056] The heat exchanger 200 is located in the heat exchange box 100. Cold water flows through the heat exchanger 200. When the cold water flows through the heat exchanger 200, it will transfer the heat of the liquid in the heat exchange box 100, thereby turning the cold water in the heat exchanger 200 into hot water for output.

[0057] The heat exchange type electric water heater 10 is provided with a first inlet 101 and a first outlet 102, and the heat exchanger 200 is provided with a second inlet 210 and a second outlet 220.

[0058] An instantaneous heater 400 is located between the reversing valve 500 and the second inlet 210 to preheat the cold water output from the reversing valve 500 before it is fed into the heat exchanger 200 through the second inlet 210 for heat exchange. For example, the instantaneous heater 400 can be a flow-through heater used to preheat the water entering the heat exchanger 200.

[0059] The reversing valve 500 is connected to the first water inlet 101, the instant heater 400 and the mixing valve 600. In this way, the reversing valve 500 can allow part of the cold water output from the first water inlet 101 of the heat exchange electric water heater 10 to flow into the mixing valve 600, and allow part of the cold water to flow through the instant heater 400 for preliminary heating before flowing into the heat exchanger 200 for heat exchange.

[0060] The mixing valve 600 is connected to the reversing valve 500, the first outlet 102, and the second outlet 220. Thus, the mixing valve 600 can receive the cold water output from the reversing valve 500 and the hot water output from the second outlet 220 of the heat exchanger 200, and mix the cold water output from the reversing valve 500 and the hot water output from the second outlet 220 of the heat exchanger 200 in proportion before outputting it to the first outlet 102 of the heat exchange electric water heater 10.

[0061] This embodiment sets up a reversing valve 500 at the inlet (i.e., the first inlet 101) of the heat exchange electric water heater 10, so that a portion of the cold water flowing out of the first inlet 101 is directly passed through the mixing valve 600, and another portion of the cold water is preheated by the instant heater 400 and flows into the heat exchanger 200. The heat exchanger 200 then exchanges heat with the preheated water and outputs hot water to the mixing valve 600. The mixing valve 600 then mixes the cold water and hot water before providing it to the user. Since the instant heater 400 of this application is located between the reversing valve 500 and the inlet (i.e., the second inlet 210) of the heat exchanger 200, even if the instant heater 400 is susceptible to temperature differences caused by voltage fluctuations, the heat exchange box 100 can absorb the temperature fluctuations caused by voltage fluctuations during the heat exchange process of the heat exchanger 200 exchanging heat with the water output from the instant heater 400, thereby improving the problem of water temperature fluctuations caused by voltage fluctuations and thus improving the stability of the final outlet water temperature.

[0062] Secondly, since the heat storage heater 300 has a very slow effect on the temperature of the liquid in the heat exchange tank 100, it can be understood that the temperature of the liquid in the heat exchange tank 100 tends to be stable throughout the entire heat exchange process. Therefore, the output hot water temperature after heat exchange using the heat exchanger 200 in the heat exchange tank 100 is also stable. In addition, since the temperature of the cold water in the input mixing valve 600 is almost equal to the ambient temperature, it is also basically unchanged. That is to say, the temperatures of both the hot and cold water in the input mixing valve 600 are unchanged. Therefore, if the flow ratio of hot and cold water in the input mixing valve 600 remains unchanged, the final outlet water temperature of the mixing valve 600 can be guaranteed to remain unchanged. In other words, the heat exchange electric water heater 10 provided in this embodiment can provide users with a stable outlet water temperature, thereby improving the user experience.

[0063] In some embodiments, the heat storage heater 300 can be placed at the bottom of the heat exchange box 100 to further improve heating efficiency and the heat of the liquid in the heat exchange box 100, as well as to ensure the uniformity of liquid temperature.

[0064] In some embodiments, an outer shell 700 may be provided outside the heat exchange box 100, and an insulation layer 800 may be provided between the outer shell 700 and the heat exchange box 100 to keep the liquid inside the heat exchange box 100 warm.

[0065] The insulation layer 800 can be made of foaming material, EPS (polystyrene foam), rubber and plastic cotton, vacuum insulation board, fiberglass cotton, etc.

[0066] In some embodiments, the heat exchange chamber 100 is provided with an air cavity 110, a liquid inlet pipe 120, an open liquid outlet pipe 130, and an exhaust port 140; wherein, the air cavity 110 is located at the top of the heat exchange chamber 100, the liquid inlet pipe 120 is connected to the reversing valve 500, and the open liquid outlet pipe 130 extends to the bottom of the heat exchange chamber 100 and is connected to the exhaust port 140.

[0067] Thus, with an air cavity 110, a liquid inlet pipe 120, and an open liquid outlet pipe 130 on the heat exchange chamber 100, liquid (such as water) can be introduced into the heat exchange chamber 100 through the liquid inlet pipe 120 before bathing, and the liquid in the heat exchange chamber 100 can be heated by the heat storage heater 300. During the heating process, the liquid in the heat exchange chamber 100 will gradually heat up and expand. At this time, the expansion of the liquid in the heat exchange chamber 100 can drive the gas in the air cavity 110 to be discharged to the outside through the open liquid outlet pipe 130 and the exhaust port 140. As the heat storage heater 300 further heats and the liquid inlet pipe 120 further introduces liquid, the liquid in the heat exchange chamber 100 will gradually increase. At this time, the air cavity 110 provided in the heat exchange chamber 100 can be used as a volume expansion space for the liquid in the heat exchange chamber 100 during heating.

[0068] When the liquid in the heat exchange chamber 100 reaches the full water level (e.g.) Figure 2 When the water level is at the position indicated by the dotted line in the diagram, the liquid exceeding the full water level can flow out naturally from the vent 140 through the open outlet pipe 130. Therefore, the heat exchange chamber 100 does not need to bear the inlet pressure and the expansion pressure of heating, which helps to improve the service life of the heat exchange chamber 100.

[0069] like Figures 2-3 As shown, the reversing valve 500 can adjust the water flow direction so that the water flows through two different channels (i.e., the water inlet channel of the heat exchange box 100 and the water inlet channel of the heat exchanger 200), thereby achieving different effects.

[0070] like Figures 1-3 As shown in the embodiments provided in this application, the heat exchanger 200 is preferably a stainless steel heat exchange pipeline, which can be immersed in the liquid in the heat exchange tank 100. In other embodiments, the heat exchanger 200 may also be a plate structure or the like, which is known in the present invention or will be realized in the future.

[0071] For example, the heat exchange pipeline provided in this application may be provided with such Figure 4 and Figure 5 Two different waterway directions, for example, Figure 4 The heat exchange piping in the middle is arranged from top to bottom. Figure 5The heat exchange piping in the tank runs from bottom to top. Because this top-to-bottom water flow ensures a uniform water temperature within the heat exchange chamber 100 after heat exchange, reducing heat loss, the preferred embodiment of this application is as follows. Figure 4 The direction of the waterway from top to bottom is shown.

[0072] Based on the heat exchange electric water heater 10 mentioned in the above embodiments, this application also provides a water temperature control method for the heat exchange electric water heater 10, see reference. Figure 6 and Figure 7 The method includes the following steps:

[0073] Step 110: Use the reversing valve to direct the water flowing from the inlet of the heat exchange electric water heater into the first pipe.

[0074] Among them, the water inlet of the heat exchange electric water heater 10 is the first water inlet 101, and the first pipeline 900 includes the first sub-pipeline 910 and the second sub-pipeline 920.

[0075] Step 120: Flow the water at the first temperature output from the first sub-pipe into the mixing valve.

[0076] Step 130: The water in the second sub-pipe is heated by passing it through an instant heater to obtain water at a second temperature.

[0077] The second temperature can be any temperature value between 15 degrees and 60 degrees.

[0078] Step 140: Input water at the second temperature into the heat exchanger for heat exchange, and obtain water at the third temperature output by the heat exchanger.

[0079] The heat exchange chamber contains a liquid at a preset temperature, and the third temperature is less than or equal to the preset temperature.

[0080] For example, the preset temperature T0 can be in the range of 60-95. For instance, when the preset temperature T0 is 80, the third temperature can be 78, 79, or 79.5.

[0081] It should be noted that the specific value of the third temperature depends on the preset temperature T0 and the heat exchange efficiency of the heat exchanger.

[0082] Step 150: Input water at the third temperature into the mixing valve.

[0083] Step 160: Use a mixing valve to mix water at the first temperature and water at the third temperature to obtain water at the fourth temperature output by the mixing valve.

[0084] Thus, since the water at a second temperature, obtained through initial heating by the instant heater, is then used for heat exchange, even if the instant heater is susceptible to temperature differences due to voltage fluctuations, the heat exchange chamber absorbs these temperature fluctuations during the heat exchange process. Furthermore, because the temperature of the liquid within the heat exchange chamber is very slowly affected by the heat storage heater, the water temperature output from the heat exchanger to the mixing valve remains stable. The temperature of the cold water entering the mixing valve is almost equal to the ambient temperature and remains essentially constant. In other words, the temperatures of both hot and cold water entering the mixing valve are constant. Therefore, with a constant flow ratio of hot and cold water into the mixing valve, the final outlet water temperature of the mixing valve remains constant. This means that the heat exchange electric water heater provided in this application can provide users with a stable outlet water temperature, thereby improving the user experience.

[0085] Furthermore, since the instant heater is activated to provide initial heating while the user is using water, it helps to continuously replenish the hot water volume. During the hot water replenishment process, the effective utilization rate of the instant heater reaches its maximum, and the hot water replenishment efficiency can also be maximized.

[0086] In some implementations, the value of the second temperature can be determined based on the law of conservation of energy, specifically by the following steps:

[0087] Step 210: Determine the flow rate of water at the second temperature.

[0088] Step 220: Based on the value of the first temperature, the specific heat capacity of water, the power of the instantaneous heater, and the flow rate of water at the second temperature, obtain the value of the second temperature.

[0089] For step 220, please refer to the following formula 1:

[0090] CM2(T2-T1)=Pt formula 1.

[0091] Where T1 is the value of the first temperature, T2 is the value of the second temperature, M2 is the flow rate of water at the second temperature, C is the specific heat capacity of water, P is the power of the instantaneous heater, and t is the unit time, which can be 1.

[0092] In some implementations, step 210 may include the following steps:

[0093] Step 211: Determine the flow rate ratio between water at the first temperature and water at the third temperature;

[0094] Step 212: Based on the flow rate ratio between the water at the first temperature and the water at the third temperature, obtain the flow rate of the water at the third temperature.

[0095] The flow rate of water at the second temperature is equal to the flow rate of water at the third temperature.

[0096] Determining the flow rate ratio between water at the first temperature and water at the third temperature may include the following steps:

[0097] Step 310: Determine the temperature difference between the fourth temperature and the first temperature to obtain the first temperature difference.

[0098] Step 320: Determine the temperature difference between the third temperature and the first temperature to obtain the second temperature difference.

[0099] Step 330: Based on the first temperature difference and the second temperature difference, obtain the flow rate ratio between water at the first temperature and water at the third temperature.

[0100] Among them, it can be based on the following formula 2:

[0101] Formula 2: CM1(T4-T1)=CM3(T3-T4)

[0102] Where M1 is the flow rate of water at the first temperature, M3 is the flow rate of water at the third temperature, T1 is the first temperature, T3 is the third temperature, T4 is the fourth temperature, (T4-T1) is the first temperature difference, (T3-T4) is the second temperature difference, and C is the specific heat capacity of water.

[0103] Step 330 may include the following:

[0104] Step 331: Determine the ratio between the first temperature difference and the second temperature difference;

[0105] Step 332: Use the ratio between the first temperature difference and the second temperature difference as the flow rate ratio between water at the first temperature and water at the third temperature.

[0106] Based on Formula 2 above, we can derive M1 / M3 = (T3-T4) / (T4-T1), which means that the ratio between the first temperature difference and the second temperature difference can be used as the flow rate ratio between water at the first temperature and water at the third temperature.

[0107] In some embodiments, before the water in the second sub-pipe 920 is heated by the instantaneous heater 400, the method further includes:

[0108] A preset liquid is introduced into the heat exchange box 100 through the liquid inlet pipe 120;

[0109] The preset liquid can be water or other heat transfer liquids with high specific heat capacity, such as oil.

[0110] In this embodiment, the inlet pipe 120 and the first pipe 900 can be switched by the reversing valve 500.

[0111] 2) When the heat storage heater 300 is used to heat the liquid in the heat exchange box 100, if the liquid in the heat exchange box 100 reaches the preset position, the liquid above the preset position will flow out from the exhaust port 140 through the open liquid outlet pipe 130.

[0112] The preset position can be the full position in the heat exchange box 100.

[0113] like Figure 3 As shown, for example, in some embodiments, the liquid in the heat exchange chamber 100 is water. When the water reaches the full water level, the water above the full water level can flow out naturally from the exhaust port 140 through the open liquid outlet pipe 130.

[0114] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0115] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “” used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof.

[0116] The above are merely specific embodiments of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily 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 invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A heat exchange type electric water heater, characterized by comprising: The heat exchange type electric water heater comprises a heat exchange box, a heat exchanger, a heat storage heater, an instant heater, a reversing valve and a water mixing valve, wherein the heat exchange box is an open box, the heat exchange type electric water heater is provided with a first water inlet and a first water outlet, the heat exchanger is provided with a second water inlet and a second water outlet; The heat storage heater is arranged in the heat exchange box; The heat exchanger is located in the heat exchange box; The instant heater is arranged between the reversing valve and the second water inlet; The reversing valve is connected to the first water inlet, the instant heater and the water mixing valve; The water mixing valve is connected to the reversing valve, the first water outlet and the second water outlet; The water temperature control method of the heat exchange type electric water heater comprises the following steps: Water flowing out of the water inlet of the heat exchange type electric water heater is flowed into a first pipeline by using the reversing valve, wherein the first pipeline comprises a first sub-pipeline and a second sub-pipeline; Water of a first temperature output by the first sub-pipeline is flowed into a water mixing valve; Water of the second sub-pipeline is heated by flowing through the instant heater to obtain water of a second temperature; The water of the second temperature is input into the heat exchanger to exchange heat to obtain water of a third temperature output by the heat exchanger, wherein a liquid of a preset temperature is arranged in the heat exchange box; The water of the third temperature is input into the water mixing valve; The water of the first temperature and the water of the third temperature are mixed by using the water mixing valve to obtain water of a fourth temperature output by the water mixing valve.

2. The heat exchange electric water heater according to claim 1, wherein An air cavity, a liquid inlet pipe, an open liquid outlet pipe and an exhaust port are arranged on the heat exchange box, wherein the air cavity is located at the top of the heat exchange box, the liquid inlet pipe is connected to the reversing valve, the open liquid outlet pipe extends to the bottom of the heat exchange box and is connected to the exhaust port.

3. The heat exchange electric water heater according to claim 1, wherein The third temperature is less than or equal to the preset temperature.

4. The heat exchange electric water heater according to claim 1, wherein Before the water of the second sub-pipeline is heated by flowing through the instant heater to obtain water of a second temperature, the method further comprises the following steps: The flow rate of the water of the second temperature is determined; Based on the numerical value of the first temperature, the specific heat capacity of water, the power of the instant heater and the flow rate of the water of the second temperature, the numerical value of the second temperature is obtained.

5. The heat exchange electric water heater according to claim 4, wherein The determination of the flow rate of the water of the second temperature comprises the following steps: The flow rate ratio between the water of the first temperature and the water of the third temperature is determined; Based on the flow rate ratio between the water of the first temperature and the water of the third temperature, the flow rate of the water of the third temperature is obtained, wherein the flow rate of the water of the second temperature is equal to the flow rate of the water of the third temperature.

6. The heat exchange electric water heater according to claim 5, wherein The determination of the flow rate ratio between the water of the first temperature and the water of the third temperature comprises the following steps: A first temperature difference between the fourth temperature and the first temperature is determined; A second temperature difference between the third temperature and the first temperature is determined; Based on the first temperature difference and the second temperature difference, the flow rate ratio between the water of the first temperature and the water of the third temperature is obtained.

7. The heat exchange electric water heater according to claim 6, wherein The determination of the flow rate ratio between the water of the first temperature and the water of the third temperature based on the first temperature difference and the second temperature difference comprises the following steps: The ratio between the first temperature difference and the second temperature difference is determined; The ratio between the first temperature difference and the second temperature difference is taken as a flow ratio between the water at the first temperature and the water at the third temperature.

8. The heat exchange electric water heater according to claim 1, wherein Before the water in the second sub-pipeline flows through the instant heater for heating, the method further comprises: inputting a preset liquid into the heat exchange box body through an inlet pipe; When the liquid in the heat exchange box body is heated by the heat storage heater, if the liquid in the heat exchange box body reaches a preset position, the liquid higher than the preset position is discharged from the exhaust port through the open outlet pipe.

9. The heat exchange electric water heater according to claim 8, wherein The heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchanger structure.

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