Heat-exchange-type electric water heater, and water temperature control method for heat-exchange-type electric water heater

Abstract

Provided in the present application are a heat-exchange-type electric water heater, and a water temperature control method for a heat-exchange-type electric water heater. The heat-exchange-type electric water heater comprises a heat exchange tank, a heat exchanger, a regenerative heater, an instant heater, a reversing valve and a water-mixing valve, wherein the heat exchange tank is an open tank; 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 regenerative heater is disposed in the heat exchange tank; the heat exchanger is located in the heat exchange tank; the instant heater is disposed 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; and 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 provided by the present application can improve the stability of the temperature of water output by a heat-exchange-type electric water heater.

Description

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

[0001] The present application claims priority to the Chinese patent application No. 202411287003.8, filed on September 13, 2024, and entitled "Heat exchange type electric water heater and water temperature control method of heat exchange type electric water heater", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of household appliances, in particular to a heat exchange type electric water heater and a water temperature control method of the heat exchange type electric water heater. BACKGROUND

[0003] Since the storage type electric water heater has the problems of dead water, breeding of bacteria, deposition of impurities, and bearing of large pressure. The instant heating type electric water heater has the problems of excessive power and insufficient hot water. Therefore, the heat exchange type electric water heater is gradually adopted in the market.

[0004] The current heat exchange type electric water heater is provided with a heat exchanger, a thermostatic valve, and a heating module arranged at the output end of the thermostatic valve. The heat exchanger outputs the input cold water after heat exchange to the thermostatic valve, and then the heating module heats the water output by the thermostatic valve and provides it to the user. However, the heating module is easily affected by voltage fluctuation, thereby causing power variation, which leads to unstable final outlet water temperature. SUMMARY

[0005] The present application provides a heat exchange type electric water heater, which can improve the stability of the outlet water temperature of the heat exchange type electric water heater.

[0006] In a first aspect, the present application provides a heat exchange type electric water heater, which comprises a heat exchange box body, a heat exchanger, a heat storage heater, an instant heater, a reversing valve, and a water mixing valve. The heat exchange box body is an open box body. 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.

[0007] The heat storage heater is arranged in the heat exchange box body.

[0008] The heat exchanger is located in the heat exchange box body.

[0009] The instant heater is arranged between the reversing valve and the second water inlet.

[0010] The reversing valve is connected to the first water inlet, the instant heater, and the water mixing valve.

[0011] The water mixing valve is connected to the reversing valve, the first water outlet, and the second water outlet.

[0012] Further, the heat exchange box is provided with an air cavity, an inlet pipe, an open outlet pipe and an exhaust port.

[0013] In a second aspect, the application provides a water temperature control method for the heat exchange electric water heater, based on the heat exchange electric water heater, the method comprises:

[0014] The water flowing out of the water inlet of the heat exchange electric water heater is flowed into the first pipeline by using the reversing valve, wherein the first pipeline comprises a first sub-pipeline and a second sub-pipeline;

[0015] The water of the first temperature output by the first sub-pipeline is flowed into the water mixing valve;

[0016] The water of the second sub-pipeline is flowed through the instant heater to be heated to obtain water of the second temperature;

[0017] The water of the second temperature is input into the heat exchanger to be heat exchanged to obtain water of the third temperature output by the heat exchanger, wherein the heat exchange box is provided with liquid of a preset temperature;

[0018] The water of the third temperature is input into the water mixing valve;

[0019] 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 the fourth temperature output by the water mixing valve.

[0020] Further, the third temperature is less than or equal to the preset temperature.

[0021] Further, the method further comprises:

[0022] The flow of the water of the second temperature is determined;

[0023] Based on the numerical value of the first temperature, the specific heat capacity of water, the power of the instant heater and the flow of the water of the second temperature, the numerical value of the second temperature is obtained.

[0024] Further, the flow of the water of the second temperature is determined, comprising:

[0025] The flow ratio between the water of the first temperature and the water of the third temperature is determined;

[0026] Based on the flow ratio between the water of the first temperature and the water of the third temperature, the flow of the water of the third temperature is obtained, wherein the flow of the water of the second temperature is equal to the flow of the water of the third temperature.

[0027] Further, the flow ratio between the water of the first temperature and the water of the third temperature is determined, comprising:

[0028] determine a temperature difference between the fourth temperature and the first temperature, to obtain a first temperature difference;

[0029] determine a temperature difference between the third temperature and the first temperature, to obtain a second temperature difference;

[0030] obtain a flow ratio between the water at the first temperature and the water at the third temperature based on the first temperature difference and the second temperature difference.

[0031] A further technical solution is to obtain a flow ratio between the water at the first temperature and the water at the third temperature based on the first temperature difference and the second temperature difference, comprising:

[0032] determine a ratio between the first temperature difference and the second temperature difference;

[0033] use the ratio between the first temperature difference and the second temperature difference as the flow ratio between the water at the first temperature and the water at the third temperature.

[0034] A further technical solution is that, before the water in the second sub-pipeline is heated by passing through the instant heater, the method further comprises:

[0035] use the liquid inlet pipe to input the preset liquid into the heat exchange box;

[0036] when the liquid in the heat exchange box reaches the preset position during heating of the liquid in the heat exchange box by the heat storage heater, the liquid above the preset position is caused to flow out of the exhaust port through the open liquid outlet pipe.

[0037] A further technical solution is that the heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchanger structure.

[0038] The beneficial effects of the present application are as follows: Different from the prior art, the present application sets a reversing valve at the water inlet (i.e., the first water inlet) of the heat exchange type electric water heater, so that part of the cold water flowing out of the first water inlet directly passes through the water mixing valve, and another part of the cold water is preliminarily heated by the instant heater and then flows into the heat exchanger, so that the heat exchanger exchanges heat with the part of the water preliminarily heated by the instant heater and then outputs hot water to the water mixing valve, and then the water mixing valve mixes the cold water and the hot water and provides them to the user. Since the instant heater of the present application is arranged between the reversing valve and the water inlet (i.e., the second water inlet) of the heat exchanger, even if the instant heater is easily affected by voltage fluctuation to cause temperature difference, the heat exchange box can be used to absorb the temperature fluctuation of the instant heater caused by voltage fluctuation during the heat exchange of the water output by the instant heater in the heat exchanger, so as to improve the problem of water temperature fluctuation caused by voltage fluctuation, and then improve the stability of the final water outlet temperature.

[0039] Secondly, since the temperature influence of the heat storage heater on the liquid in the heat exchange box is very slow, based on this, it can be understood that the temperature of the liquid in the heat exchange box is stable during the whole heat exchange process, therefore, the temperature of the hot water output after heat exchange by the heat exchanger in the heat exchange box is stable, in addition, since the temperature of the cold water in the input mixing valve is almost equal to the ambient temperature, it is also basically unchanged, that is, the temperature of the hot water and the cold water in the input mixing valve is unchanged, therefore, in the case that the flow ratio of the hot water and the cold water in the input mixing valve is unchanged, the final outlet water temperature of the mixing valve can be ensured to be unchanged, that is, the heat exchange type electric water heater provided by the application can provide stable outlet water temperature for the user, thereby improving the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Among them:

[0042] Fig. 1 is a structural schematic diagram of an embodiment of the heat exchange type electric water heater provided by the application;

[0043] Fig. 2 is a heat exchange flow direction schematic diagram of an embodiment of the heat exchange type electric water heater provided by the application;

[0044] Fig. 3 is a water inlet and outlet schematic diagram of the heat exchange box of an embodiment of the heat exchange type electric water heater provided by the application;

[0045] Fig. 4 is a waterway schematic diagram of an embodiment of the heat exchanger in the heat exchange type electric water heater provided by the application;

[0046] Fig. 5 is a waterway schematic diagram of another embodiment of the heat exchanger in the heat exchange type electric water heater provided by the application;

[0047] Fig. 6 is a structural schematic diagram of another embodiment of the heat exchange type electric water heater provided by the application;

[0048] Fig. 7 is a flowchart schematic diagram of an embodiment of the water temperature control method of the heat exchange type electric water heater provided by the application.

[0049] Explanation of reference signs: heat exchanger 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, water mixing valve 600, shell 700, heat preservation layer 800, first pipeline 900, first sub-pipeline 910, second sub-pipeline 920. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0051] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the components and arrangements of the examples that are described herein are shown and described separately. It is to be understood, however, that the implementations of the present application are not limited to the examples described and / or illustrated herein. Moreover, the present application can be implemented in various examples having several of the features consistently shown in the drawings.

[0052] Since the storage type electric water heater has problems such as dead water, breeding of bacteria, deposition of impurities, and bearing of large pressure. And the instant type electric water heater has problems such as too large power and insufficient hot water, based on this, the market gradually turns to the heat exchanger type electric water heater.

[0053] The current heat exchanger type electric water heater is provided with a heat exchanger, a thermostatic valve, and a heating module arranged at the output end of the thermostatic valve, wherein the heat exchanger outputs the input cold water after heat exchange to the thermostatic valve, and then the heating module heats the water output by the thermostatic valve and provides it to the user. However, since the heating module is easily affected by voltage fluctuation, thereby causing power variation, which leads to the problem of unstable final outlet water temperature.

[0054] Therefore, in order to solve the technical problem of unstable outlet water temperature of the existing heat exchanger type electric water heater, the present application provides a heat exchanger type electric water heater and a corresponding water temperature control method, which can improve the stability of the outlet water temperature, please refer to the following embodiments.

[0055] As shown in FIG. 1, the heat exchange type electric water heater 10 provided by the present application comprises a heat exchange box 100, a heat exchanger 200, a heat storage heater 300, an instant heater 400, a reversing valve 500, and a mixing valve 600. The heat exchange box 100 can be used to store energy storage substances, such as water or oil and the like. Since the heat exchange box 100 in the embodiment is an open box, the shape of the heat exchange box 100 is diverse, that is, the user can flexibly adjust the shape of the heat exchange box 100 according to the actual situation and preferences.

[0056] The heat storage heater 300 is arranged in the heat exchange box 100 and is used to heat the liquid in the heat exchange box 100, so that the temperature of the liquid in the heat exchange box 100 is heated to a preset temperature, so as to be able to exchange heat with the cold water in the heat exchanger 200 subsequently.

[0057] The heat exchanger 200 is located in the heat exchange box 100, and the heat exchanger 200 is used to flow through the cold water. When the cold water flows through the heat exchanger 200, the heat of the liquid in the heat exchange box 100 is transferred out, so that the cold water in the heat exchanger 200 becomes hot water and is output.

[0058] The heat exchange type electric water heater 10 is provided with a first water inlet 101 and a first water outlet 102, and the heat exchanger 200 is provided with a second water inlet 210 and a second water outlet 220.

[0059] The instant heater 400 is arranged between the reversing valve 500 and the second water inlet 210, so as to preliminarily heat the cold water output by the reversing valve 500 and then input the cold water into the heat exchanger 200 through the second water inlet 210 for heat exchange. For example, the instant heater 400 can be a flow type heater, which is used to preheat the water entering the heat exchanger 200.

[0060] 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 flow part of the cold water output by the first water inlet 101 of the heat exchange type electric water heater 10 into the mixing valve 600, and flow part of the cold water through the instant heater 400 for preliminary heating and then into the heat exchanger 200 for heat exchange.

[0061] The mixing valve 600 is connected to the reversing valve 500, the first water outlet 102, and the second water outlet 220. In this way, the mixing valve 600 can receive the cold water output by the reversing valve 500 and the hot water output by the second water outlet 220 of the heat exchanger 200, and mix the cold water output by the reversing valve 500 and the hot water output by the second water outlet 220 of the heat exchanger 200 in a certain proportion and then output to the first water outlet 102 of the heat exchange type electric water heater 10.

[0062] The embodiment sets a reversing valve 500 at the water inlet (i.e. the first water inlet 101) of the heat exchange electric water heater 10, so as to directly pass part of the cold water flowing out of the first water inlet 101 through the mixing valve 600, and pass another part of the cold water through the instant heater 400 for preliminary heating, and then flow into the heat exchanger 200, so as to utilize the heat exchanger 200 to exchange heat with the part of the water preliminarily heated, and then output hot water to the mixing valve 600, and then the mixing valve 600 mixes the cold water and the hot water and then provides the user. Since the instant heater 400 of the present application is arranged between the reversing valve 500 and the water inlet (i.e. the second water inlet 210) of the heat exchanger 200, even if the instant heater 400 is easily affected by voltage fluctuation to cause temperature difference, the heat exchanger box 100 can be utilized to absorb the temperature fluctuation of the instant heater 400 caused by voltage fluctuation in the process of exchanging heat between the heat exchanger 200 and the water output by the instant heater 400, so as to improve the problem of water temperature fluctuation caused by voltage fluctuation, and then improve the stability of the final water outlet temperature.

[0063] Secondly, since the temperature influence of the heat storage heater 300 on the liquid in the heat exchanger box 100 is very slow, it can be understood that the temperature of the liquid in the heat exchanger box 100 is stable during the whole heat exchange process, and therefore the temperature of the hot water output by the heat exchanger 200 in the heat exchanger box 100 is stable. In addition, since the temperature of the cold water input into the mixing valve 600 is almost equal to the ambient temperature and is basically unchanged, that is, the temperature of the hot water and the cold water input into the mixing valve 600 is unchanged, therefore, the final water outlet temperature of the mixing valve 600 can be ensured to be unchanged in the case that the flow ratio of the hot water and the cold water input into the mixing valve 600 is unchanged, that is, the heat exchange electric water heater 10 provided by the embodiment can provide stable water outlet temperature for the user, so as to improve the user experience.

[0064] In some embodiments, the heat storage heater 300 can be arranged at the bottom of the heat exchanger box 100, so as to further improve the heating efficiency and the heat of the liquid in the heat exchanger box 100, and ensure the uniformity of the liquid temperature.

[0065] In some embodiments, an outer shell 700 can be arranged outside the heat exchanger box 100, and a heat preservation layer 800 is arranged between the outer shell 700 and the heat exchanger box 100, so as to preserve the heat of the liquid in the heat exchanger box 100.

[0066] The heat preservation layer 800 can be foaming material, EPS (polystyrene foam), rubber plastic cotton, vacuum heat insulation board, glass wool, etc.

[0067] In some embodiments, the heat exchange box 100 is provided with an air cavity 110, a liquid inlet pipe 120, an open liquid outlet pipe 130, and an exhaust port 140. The air cavity 110 is located at the top of the heat exchange box 100, and the liquid inlet pipe 120 is connected to the reversing valve 500. The open liquid outlet pipe 130 extends to the bottom of the heat exchange box 100 and is connected to the exhaust port 140.

[0068] In this way, the heat exchange box 100 is provided with the air cavity 110, the liquid inlet pipe 120, and the open liquid outlet pipe 130. Before bathing, liquid (such as water, etc.) can be input into the heat exchange box 100 through the liquid inlet pipe 120, and the liquid in the heat exchange box 100 is heated by the heat storage heater 300. During the heating process, the liquid in the heat exchange box 100 gradually expands, and at this time, the expansion of the liquid in the heat exchange box 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 is further heated and the liquid inlet pipe 120 is further inputted with liquid, the liquid in the heat exchange box 100 gradually increases, and at this time, the air cavity 110 provided in the heat exchange box 100 can be used as a volume expansion space for the liquid in the heat exchange box 100 during heating.

[0069] When the liquid in the heat exchange box 100 reaches the full water level (such as the dashed line position in FIG. 2), the liquid above the full water level can flow out of the exhaust port 140 through the open liquid outlet pipe 130. Therefore, the heat exchange box 100 does not need to bear the liquid inlet pressure and the heating expansion pressure, thereby helping to improve the service life of the heat exchange box 100.

[0070] As shown in FIGS. 2-3, the reversing valve 500 can adjust the water flow direction to make the water flow through two different flow channels (i.e., the water inlet flow channel of the heat exchange box 100 and the water inlet flow channel of the heat exchanger 200), thereby achieving different effects.

[0071] As shown in FIGS. 1-3, in the embodiments provided by the present application, the heat exchanger 200 is preferably a stainless steel heat exchange pipe, which can be immersed in the liquid in the heat exchange box 100. In other embodiments, the heat exchanger 200 can also be a plate structure known in the art or to be realized in the future.

[0072] For example, the heat exchange pipe provided by the present application can be provided with two different water path directions as shown in FIGS. 4 and 5. For example, the heat exchange pipe in FIG. 4 is from top to bottom as a whole, and the heat exchange pipe in FIG. 5 is from bottom to top as a whole. Since the water path direction from top to bottom can make the water temperature in the heat exchange box 100 uniform after heat exchange, and reduce heat loss, the embodiments of the present application preferably have the water path direction from top to bottom as shown in FIG. 4.

[0073] Based on the heat exchange type electric water heater 10 mentioned in the above embodiment, the application further provides a water temperature control method of the heat exchange type electric water heater 10, referring to FIG. 6 and FIG. 7, the method comprises the following steps:

[0074] Step 110: using the reversing valve to flow the water from the water inlet of the heat exchange type electric water heater into the first pipeline.

[0075] Wherein, the water inlet of the heat exchange type electric water heater 10 is the first water inlet 101, and the first pipeline 900 comprises a first sub-pipeline 910 and a second sub-pipeline 920.

[0076] Step 120: flowing the water of the first temperature output by the first sub-pipeline into the water mixing valve.

[0077] Step 130: flowing the water of the second sub-pipeline through the instant heater to heat, obtaining the water of the second temperature.

[0078] Wherein, the second temperature can be any temperature value in the range of 15-60 degrees.

[0079] Step 140: inputting the water of the second temperature into the heat exchanger to exchange heat, obtaining the water of the third temperature output by the heat exchanger.

[0080] Wherein, the heat exchanger is provided with a liquid of a preset temperature, and the third temperature is less than or equal to the preset temperature.

[0081] Exemplarily, the preset temperature T0 can be in the range of 60-95, for example, when the temperature of the preset temperature T0 is 80, the third temperature can be 78, 79, 79.5.

[0082] It should be noted that the third temperature can be how much depends on the value of the preset temperature T0 and the heat exchange efficiency of the heat exchanger.

[0083] Step 150: inputting the water of the third temperature into the water mixing valve.

[0084] Step 160: using the water mixing valve to mix the water of the first temperature and the water of the third temperature, obtaining the water of the fourth temperature output by the water mixing valve.

[0085] Thus, since the second temperature water obtained by the preliminary heating of the instant heater is further heat-exchanged, even if the instant heater is susceptible to temperature difference caused by voltage fluctuation, the temperature fluctuation caused by voltage fluctuation of the instant heater can be absorbed by the heat exchange box during the heat exchange of the water output by the instant heater in the heat exchanger, and since the temperature influence of the heat storage heater on the liquid in the heat exchange box is very slow, the water temperature output by the heat exchanger to the mixing valve is stable, and the temperature of the cold water input into the mixing valve is almost equal to the ambient temperature and is basically unchanged, that is, the temperature of the hot water and the cold water input into the mixing valve is unchanged, so that the final water temperature of the mixing valve is unchanged under the condition that the flow ratio of the hot water and the cold water input into the mixing valve is unchanged, that is, the heat exchange type electric water heater provided by the present application can provide stable water temperature for the user, thereby improving the user experience.

[0086] In addition, since the instant heater is started to perform preliminary heating at the same time as the user uses water, it is helpful to continuously supplement the hot water amount, and the effective utilization rate of the instant heater reaches the highest during the supplement of the hot water amount, so that the supplement utilization efficiency of the hot water amount can also reach the maximum.

[0087] In some embodiments, the value of the second temperature can be determined based on the law of conservation of energy, and specifically the following steps can be adopted:

[0088] Step 210: determining the flow of the second temperature water.

[0089] Step 220: obtaining the value of the second temperature based on the value of the first temperature, the specific heat capacity of water, the power of the instant heater, and the flow of the second temperature water.

[0090] For step 220, specifically, refer to the following formula 1: CM2(T2-T1)=Pt Formula 1.

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

[0092] In some embodiments, step 210 can include the following steps:

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

[0094] Step 212: obtaining the flow of the third temperature water based on the flow ratio between the first temperature water and the third temperature water.

[0095] Wherein, the flow of the second temperature water is equal to the flow of the third temperature water.

[0096] The determining of the flow ratio between the water at the first temperature and the water at the third temperature can include the following steps:

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

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

[0099] Step 330: obtaining the flow ratio between the water at the first temperature and the water at the third temperature based on the first temperature difference and the second temperature difference.

[0100] The first temperature difference and the second temperature difference can be determined according to the following formula 2: CM1(T4-T1) = CM3(T3-T4) Formula 2.

[0101] In the formula 2, M1 is the flow of the water at the first temperature, M3 is the flow of the 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 the water.

[0102] The step 330 can include the following:

[0103] Step 331: determining a ratio between the first temperature difference and the second temperature difference.

[0104] Step 332: taking the ratio between the first temperature difference and the second temperature difference as the flow ratio between the water at the first temperature and the water at the third temperature.

[0105] Based on the above formula 2, it can be obtained that M1 / M3 = (T3-T4) / (T4-T1), that is, the ratio between the first temperature difference and the second temperature difference can be taken as the flow ratio between the water at the first temperature and the water at the third temperature.

[0106] In some embodiments, before the water in the second sub-pipeline 920 flows through the instant heater 400 to be heated, the method further includes:

[0107] The preset liquid is input into the heat exchange box 100 through the liquid inlet pipe 120.

[0108] The preset liquid can be water or other heat transfer liquid with high specific heat capacity, such as oil and the like.

[0109] In the embodiment, the liquid inlet pipe 120 and the first pipeline 900 can be switched by the reversing valve 500.

[0110] 2) when the liquid in the heat exchange box 100 is heated by the heat storage heater 300, if the liquid in the heat exchange box 100 reaches a preset position, the liquid higher than the preset position is flowed out from the exhaust port 140 through the open liquid outlet pipe 130.

[0111] The preset position can be a full position in the heat exchange box 100.

[0112] As shown in FIG. 3, for example, in some embodiments, the liquid in the heat exchange box 100 is water, when the water reaches the full water level, the water higher than the full water level can be naturally flowed out from the exhaust port 140 through the open liquid outlet pipe 130.

[0113] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment.

[0114] 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. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0115] The above is only a specific embodiment of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed 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.

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. A water temperature control method for a heat recovery electric water heater, characterized by, The heat exchange type electric water heater based on the above-mentioned claims 1-2, the method comprises: The 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; The water of the first temperature output by the first sub-pipeline is flowed into the water mixing valve; The water of the second sub-pipeline is heated by flowing through the instant heater to obtain water of the second temperature; The water of the second temperature is input into the heat exchanger to exchange heat to obtain water of the 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 the fourth temperature output by the water mixing valve.

4. The water temperature control method of the heat recovery electric water heater according to claim 3, characterized by, The third temperature is less than or equal to the preset temperature.

5. The water temperature control method of the heat recovery electric water heater according to claim 3, wherein Before the water of the second sub-pipeline is heated by flowing through the instant heater to obtain water of the second temperature, the method further comprises: Determining the flow rate of the water of the second temperature; Based on the 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 value of the second temperature is obtained.

6. The water temperature control method of the heat recovery electric water heater according to claim 5, wherein The determination of the flow rate of the water of the second temperature comprises: Determining the flow rate ratio between the water of the first temperature and the water of the third temperature; 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.

7. The water temperature control method of the heat recovery 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 comprises: Determining the temperature difference between the fourth temperature and the first temperature to obtain a first temperature difference; Determining the temperature difference between the third temperature and the first temperature to obtain a second temperature difference; 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.

8. The water temperature control method of the heat recovery electric water heater according to claim 7, 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: determining a ratio between the first temperature difference and the second temperature difference; using the ratio between the first temperature difference and the second temperature difference as a flow ratio between the water at the first temperature and the water at the third temperature.

9. The water temperature control method of the heat recovery electric water heater according to claim 3, characterized by, 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 a liquid inlet pipe; when the liquid in the heat exchange box body reaches a preset position during heating of the liquid in the heat exchange box body by the heat storage heater, the liquid above the preset position is caused to flow out of the exhaust port through the open liquid outlet pipe.

10. The water temperature control method of the heat recovery electric water heater according to claim 9, wherein The heat exchanger is a stainless steel heat exchange pipeline or a plate heat exchanger structure.

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