Heat exchange type electric water heater

Abstract

The utility model relates to a heat exchange type electric water heater which comprises a heat preservation box, a heat exchanger, a circulating pump and an energy saver, and the heat exchange type electric water heater is provided with a water inlet and a water outlet. Wherein the heat preservation box is provided with a first heater, and the first heater is used for heating a heat exchange medium in the heat preservation box; the heat exchanger is provided with a first connecting end and a second connecting end. The circulating pump is connected between the heat preservation box and the first connecting end. The second connecting end is connected to the water inlet and the water outlet; the energy saver is connected to the heat preservation box and used for heating the heat exchange medium in the heat preservation box. According to the heat exchange type electric water heater, energy consumption can be reduced, the heating efficiency of the heat exchange medium is improved, and therefore the energy utilization rate of the heat exchange type electric water heater is improved, and the effect of saving energy is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water heaters, in particular to a heat exchange type electric water heater. BACKGROUND

[0002] With the improvement of people's living standards, consumers not only need hot water to bathe, but also pay more attention to health and put forward higher requirements on the quality of bathing water. The traditional heat storage type electric water heater is easy to cause sediment, magnesium rod residue and scale to deposit in the water tank due to preheating and long-term heat preservation of bathing water, thereby affecting the health of bathing water.

[0003] Therefore, more and more heat exchange type electric water heaters appear on the market, that is, a heat exchanger is arranged in the water heater, and the working principle is to preheat the heat exchange medium, when the user uses hot water, the tap water and the heat exchange medium are exchanged and heated by the heat exchanger, and then the heater is directly heated for use.

[0004] Since the tap water is flowing water, that is, living water, and is independent of the heat exchange medium in the water tank, the temperature of the tap water is raised by exchanging the tap water and the heat exchange medium, which does not cause water pollution, but the existing heat exchange type electric water heater adopts an electric heater to heat the heat exchange medium throughout the process, which consumes a large amount of electric energy and is not energy-saving. CONTENT OF THE INVENTION

[0005] The present application provides a heat exchange type electric water heater to solve the problem that the existing heat exchange type electric water heater adopts an electric heater to heat the heat exchange medium throughout the process, which consumes a large amount of electric energy and is not energy-saving.

[0006] In a first aspect, the present application provides a heat exchange type electric water heater, which comprises a heat preservation tank, a heat exchanger, a circulating pump and an energy saver, and is provided with a water inlet and a water outlet;

[0007] The heat preservation tank is provided with a first heater, and the first heater is used to heat the heat exchange medium inside the heat preservation tank;

[0008] The heat exchanger is provided with a first connecting end and a second connecting end, and the circulating pump is connected between the heat preservation tank and the first connecting end;

[0009] The second connecting end is connected to the water inlet and the water outlet;

[0010] The energy saver is connected to the heat preservation tank and is used to heat the heat exchange medium inside the heat preservation tank.

[0011] Further technical solutions are that the heat exchange type electric water heater is further provided with a first temperature sensor and a second temperature sensor, and the first temperature sensor and the second temperature sensor are respectively located at the input end and the output end of the energy saver.

[0012] Further, the heat exchange type electric water heater is further provided with a reversing valve and a pipeline assembly, and the heat preservation box is provided with a first end, a second end and a third end;

[0013] The pipeline assembly comprises a first pipeline, a second pipeline and a third pipeline, the second pipeline comprises a first sub-pipeline and a second sub-pipeline, the first end, the first pipeline, the first connecting end, the reversing valve, the second sub-pipeline, the circulating pump and the second end are sequentially connected;

[0014] The output end of the energy saver, the first sub-pipeline, the reversing valve, the second sub-pipeline, the circulating pump and the second end are sequentially connected;

[0015] The third end, the third pipeline and the input end of the energy saver are sequentially connected.

[0016] Further, the heat exchange type electric water heater is further provided with a second heater and a water mixing valve, and the pipeline assembly further comprises a fourth pipeline, the fourth pipeline is provided with a third sub-pipeline and a fourth sub-pipeline;

[0017] The water inlet, the third sub-pipeline, the second connecting end, the second heater, the water mixing valve and the water outlet are sequentially connected;

[0018] The fourth sub-pipeline is connected between the water inlet and the water mixing valve.

[0019] Further, the heat exchange type electric water heater is further provided with a third temperature sensor and a fourth temperature sensor, the third temperature sensor and the fourth temperature sensor are respectively located at the input end and the output end of the water mixing valve.

[0020] Further, the energy saver is a solar flat plate collector or a waste heat recovery device.

[0021] Further, the heat exchange medium in the heat preservation box is water, oil or antifreeze.

[0022] Further, the heat preservation box is an open type heat preservation box or a pressure-bearing type heat preservation box.

[0023] Further, the second heater is an instant heater.

[0024] Further, the heat exchanger is a plate type heat exchanger or a tube-in-tube type heat exchanger.

[0025] Compared with the prior art, the above technical scheme provided by the embodiment of the present application has the following advantages:

[0026] The heat exchange type electric water heater provided by the embodiment of the present application is provided with an energy saving device, the energy saving device is connected to the heat preservation box, the energy saving device is used to heat the heat exchange medium in the heat preservation box, which helps to reduce the use of the electric heater in the heat preservation box, thereby reducing energy consumption and improving the heating efficiency of the heat exchange medium, so as to improve the energy utilization rate of the heat exchange type electric water heater and realize the effect of saving energy. BRIEF DESCRIPTION OF DRAWINGS

[0027] The drawings incorporated into the specification and constituting a part of the specification show the embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can also be obtained by those skilled in the art without any creative labor under the premise of the drawings.

[0029] One or more embodiments are exemplarily illustrated by the pictures in the drawings corresponding to the embodiments, and the exemplarily illustrations do not constitute the limitation of the embodiments, the elements with the same reference numerals in the drawings represent the similar elements, and the drawings do not constitute the proportional limitation unless specially stated.

[0030] Figure 1 A structural schematic diagram of a heat exchange type electric water heater provided by the embodiment of the present application.

[0031] Figure 2 A schematic diagram of a heat exchange type electric water heater provided by the embodiment of the present application is mode one.

[0032] Figure 3 A schematic diagram of a heat exchange type electric water heater provided by the embodiment of the present application is mode two.

[0033] Figure 4 A flow direction schematic diagram of the heat exchange medium heating circulation module and the bathing water heating module working simultaneously provided by the embodiment of the present application.

[0034] Explanation of reference numerals:

[0035] The first pipeline 1, the second pipeline 2, the first sub-pipeline 21, the second sub-pipeline 22, the third pipeline 3, the fourth pipeline 4, the third sub-pipeline 41, the fourth sub-pipeline 42, the heat exchange medium heating circulation module 10, the bathing water heating module 20, the heat preservation box 100, the first end 110, the second end 120, the third end 130, the heat exchanger 200, the first connecting end 210, the second connecting end 220, the circulating pump 300, the energy saver 400, the input end 410, the output end 420, the reversing valve 500, the mixing valve 600, the water inlet 101, the water outlet 102, the first heater 103, the second heater 104, the first temperature sensor 105, the second temperature sensor 106, the third temperature sensor 107, the fourth temperature sensor 108. DETAILED DESCRIPTION

[0036] To make the objects, 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 protection scope of the present application.

[0037] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For the purpose of simplicity, the description of a particular example of the present application will be described in the following. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to the numbers and / or letters in different examples. Such repetition is for the purpose of simplification and clarity, and it does not indicate the relationship between the various embodiments and / or settings discussed.

[0038] For the convenience of description, spatial relative terms can be used in the specification to describe the relative position relationship or movement condition of one element or feature relative to another element or feature as shown in the drawings, such as "inner", "outer", "inboard", "outboard", "under", "below", "on", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over or the posture is changed or the movement state is changed, the directional indications will also change accordingly, for example: the element described as "under" or "below" another element or feature will be oriented as "above" or "over" another element or feature. Therefore, the example term "below" can include both upward and downward positions. The device can be additionally oriented (rotated by 90 degrees or in other directions) and the spatial relative relationship descriptors used in the specification are interpreted accordingly.

[0039] In order to solve the problem that the energy consumption is easy to be caused by heating the heat exchange medium by using the electric heater in the prior art, resulting in that the energy utilization rate of the heat exchange type electric water heater is relatively low, the application provides a heat exchange type electric water heater, which can realize the effect of saving energy.

[0040] Figure 1 A structural schematic diagram of a heat exchange type electric water heater provided by the application embodiment.

[0041] Referring to Figures 1-4 The heat exchange type electric water heater provided by the application comprises a heat preservation box 100, a heat exchanger 200, a circulating pump 300 and an energy saver 400, and is provided with a water inlet 101 and a water outlet 102.

[0042] The heat preservation box 100 is provided with a first heater 103, and the first heater 103 is used for heating the heat exchange medium inside the heat preservation box 100.

[0043] The heat exchanger 200 is provided with a first connecting end 210 and a second connecting end 220, and the circulating pump 300 is connected between the heat preservation box 100 and the first connecting end 210, and is used for driving the heat exchange medium to circulate, so as to heat or exchange heat.

[0044] The second connecting end 220 is connected to the water inlet 101 and the water outlet 102.

[0045] The energy saver 400 is connected to the heat preservation box 100, and is used for heating the heat exchange medium inside the heat preservation box 100.

[0046] The heat exchange type electric water heater provided by the embodiment is provided with the energy saver 400 connected to the heat preservation box 100, the energy saver 400 is used to heat the heat exchange medium in the heat preservation box 100, which helps to reduce the use of the electric heater in the heat preservation box 100, and further reduces the energy consumption and improves the heating efficiency of the heat exchange medium, thereby improving the energy utilization rate of the heat exchange type electric water heater and realizing the effect of saving energy.

[0047] In some embodiments, the energy saver 400 is a solar flat plate collector or a waste heat recovery device.

[0048] Since the solar flat plate collector or the waste heat recovery device is used to exchange heat by absorbing waste heat or solar radiation heat, the energy saver 400 using the solar flat plate collector or the waste heat recovery device is more environmentally friendly and energy-saving than using the electric heater.

[0049] In some embodiments, the heat exchange medium in the heat preservation box 100 is water, oil or antifreeze.

[0050] In some embodiments, the heat preservation box 100 is an open heat preservation box 100 or a pressure-bearing heat preservation box 100.

[0051] In some embodiments, the first heater 103 is an energy storage heater.

[0052] In some embodiments, the heat exchange type electric water heater is further provided with a reversing valve 500 and a pipeline assembly, and the heat preservation box 100 is provided with a first end 110, a second end 120 and a third end 130.

[0053] The pipeline assembly includes a first pipeline 1, a second pipeline 2 and a third pipeline 3, the second pipeline 2 includes a first sub-pipeline 21 and a second sub-pipeline 22, the first end 110, the first pipeline 1, a first connecting end 210, the reversing valve 500, the second sub-pipeline, a circulating pump 300 and the second end 120 are connected in sequence.

[0054] The output end 420 of the energy saver 400, the first sub-pipeline 21, the reversing valve 500, the second sub-pipeline, the circulating pump 300 and the second end 120 are connected in sequence.

[0055] The third end 130, the third pipeline 3 and the input end 410 of the energy saver 400 are connected in sequence.

[0056] Among them, the heat preservation box 100, the first pipeline 1, the heat exchanger 200, the second pipeline 2, the reversing valve 500, the circulating pump 300 and the energy saver 400 are connected to form a heat exchange medium heating circulation module 10.

[0057] Among them, the reversing valve 500 is used to automatically switch the flow direction of the heat exchange medium.

[0058] The heat exchange medium heating circulation module 10 includes the following two working modes:

[0059] Mode one: for heat exchange medium and bath tap water heat exchange.

[0060] As shown in the figure, when the heat exchange medium heating circulation module 10 is in mode one, the reversing valve 500 is switched to the second pipeline 2 and the second sub-pipeline 22 conduction, the circulating pump 300 is started, the heat exchange medium enters the heat exchanger 200 after the bath tap water heat exchange through the first pipeline 1, and then enters the heat preservation box 100 through the second pipeline 2, the reversing valve 500, the circulating pump 300, and the second sub-pipeline 22, and repeatedly circulates heat exchange. Figure 2 Mode two: for heat exchange medium circulation heating.

[0061] As shown in the figure, when the heat exchange medium heating circulation module 10 is in mode two, the reversing valve 500 is switched to the first sub-pipeline 21 and the second sub-pipeline 22 conduction, the circulating pump 300 is started, and the heat exchange medium in the heat preservation box 100 enters the energy saver 400 through the third pipeline 3, and then enters the heat preservation water tank through the first sub-pipeline 21 and the second sub-pipeline 22, and completes the circulation.

[0062] Figure 3 In some embodiments, the heat exchange medium heating includes three ways, and corresponds to three program modes selected by the user, wherein the first way is the energy-saving mode through the energy saver 400 heating; the second way is the standard mode through the first heater 103 in the heat preservation box 100 heating; and the third way is the fast heating mode through the energy saver 400 and the heater 1 heating at the same time.

[0063] For example, when the heat exchange medium temperature in the heat preservation box 100 does not reach the first set value, and the user selects the energy-saving mode, the reversing valve 500 is switched to the first sub-pipeline 21 and the second sub-pipeline 22 conduction, the circulating pump 300 is started, the heat exchange medium in the heat preservation box 100 enters the energy saver 400 through the third pipeline 3, and then enters the heat preservation water tank through the first sub-pipeline 21 and the second sub-pipeline 22, and repeatedly circulates until the heat exchange medium reaches the first set value, and the circulating pump 300 stops working.

[0064] When the heat exchange medium temperature in the heat preservation box 100 does not reach the second set value, and the user selects the standard mode, the first heater 103 in the heat preservation box 100 works to heat the heat exchange medium in the heat preservation box 100, and then the first heater 103 stops working when the heat exchange medium reaches the second set value.

[0065] When the heat exchange medium temperature in the heat preservation box 100 does not reach the second set value, and the user selects the standard mode, the first heater 103 in the heat preservation box 100 works to heat the heat exchange medium in the heat preservation box 100, and then the first heater 103 stops working when the heat exchange medium reaches the second set value.

[0066] ​When the temperature of the heat exchange medium in the heat preservation box 100 does not reach the third set value, and the user selects the rapid heating mode, the reversing valve 500 is switched to the first sub-pipe 21 and the second sub-pipe 22 being in conduction, the circulating pump 300 is started, the heat exchange medium in the heat preservation box 100 enters the energy saver 400 through the third pipe 3, then enters the heat preservation water tank through the first sub-pipe 21 and the second sub-pipe 22, and repeatedly circulates, and at the same time, the first heater 103 works until the temperature of the heat exchange medium reaches the third set value, and then the circulating pump 300 and the first heater 103 stop working. In this way, the first heater 103 and the energy saver 400 heat the heat exchange medium at the same time, which can shorten the heating time, improve the heating efficiency, make the heat exchange medium quickly reach the set temperature, and provide sufficient hot water for the user.

[0067] In this way, the heat exchange type electric water heater provided by the application can make the user flexibly select the required mode to heat the heat exchange medium in the heat preservation box 100 according to actual requirements, thereby achieving the effects of environmental protection and energy saving or improving the heating efficiency.

[0068] In some embodiments, the heat exchange type electric water heater is further provided with a first temperature detector 105 and a second temperature detector 106, and the first temperature detector 105 and the second temperature detector 106 are respectively located at the input end 410 and the output end 420 of the energy saver 400.

[0069] Among them, the first temperature detector 105 and the second temperature detector 106 can be temperature probes for detecting the temperature of the heat exchange medium.

[0070] The heat exchange medium is heated after absorbing waste heat or solar radiation heat through the energy saver 400, and when the heat exchange medium absorbs more heat, the temperature difference between the second temperature detector 106 and the first temperature detector 105 is larger, the heating effect is better, and the heating time is shorter.

[0071] When the heating temperature difference is too small or close to 0, it means that there is no heat exchange, and at this time, the first heater 103 is automatically switched to heat, that is, when the heat exchange of the energy saver 400 is too small (the difference between the second temperature detector 106 and the first temperature detector 105 is close to 0), the heat exchange medium is heated in the standard mode.

[0072] In some embodiments, the heat exchange type electric water heater is further provided with a second heater 104 and a water mixing valve 600, and the pipe assembly further includes a fourth pipe 4, and the fourth pipe 4 is provided with a third sub-pipe 41 and a fourth sub-pipe 42.

[0073] The water inlet 101, the third sub-pipe 41, the second connecting end 220, the second heater 104, the water mixing valve 600, and the water outlet 102 are connected in sequence.

[0074] The fourth sub-pipe 42 is connected between the water inlet 101 and the water mixing valve 600, and the water mixing valve 600 is used for temperature adjustment of the bathing hot water.

[0075] The inlet 101, the fourth pipe 4, the heat exchanger 200, the second heater 104, the mixing valve 600 and the outlet 102 are connected to form the bath water heating module 20. When the heat exchange medium heating circulation module 10 is in mode one, the bath water heating module 20 is also in working state, that is, mode one and the bath water heating module 20 work at the same time.

[0076] When a user uses hot water, the tap water is split into two streams through the fourth pipe 4. One stream enters the heat exchanger 200 through the third sub-pipe 41 to exchange heat with the heat exchange medium and then enters the mixing valve 600 after being heated by the second heater 104. The other stream enters the mixing valve 600 directly through the fourth sub-pipe 42. The mixing valve 600 automatically adjusts the ratio of hot and cold water to maintain a constant temperature according to the user's required temperature.

[0077] like Figure 4 As shown, at this time, the heat exchange medium heating circulation module 10 is in mode one, the reversing valve 500 switches to connect the second pipe 2 and the second sub-pipe 22, the circulation pump 300 starts, the heat exchange medium enters the heat exchanger 200 through the first pipe 1 and exchanges heat with the bath water, and then enters the insulation box 100 through the second pipe 2, the reversing valve 500, the circulation pump 300, and the second sub-pipe 22 for repeated circulation heat exchange.

[0078] In some embodiments, the second heater 104 is an instant heater, which is located at the inlet or outlet of the heat exchanger 200 in the bath water heating module 20 to further heat the bath water.

[0079] In some embodiments, the heat exchange electric water heater is further provided with a third thermometer 107 and a fourth thermometer 108, which are located at the input end 410 and the output end 420 of the mixing valve 600, respectively.

[0080] In some embodiments, the heat exchanger 200 is a plate heat exchanger or a shell-and-tube heat exchanger.

[0081] In addition, since the existing heat exchange type electric water heaters immerse the heat exchanger 200 in the heat exchange medium, it is not easy for users to detect when the heat exchanger 200 leaks, which can easily cause water pollution. Furthermore, the repair and replacement of the heat exchanger 200 is also quite complicated after a leak occurs.

[0082] The heat exchanger 200 provided in this embodiment is installed on the first pipe 1 outside the insulation box 100, that is, it is set up separately and independently from the insulation box 100. Therefore, when the heat exchanger 200 leaks, the user can detect it in time, thereby improving the problem of bath water pollution caused by the mixing of bath water and heat exchange medium. In addition, the independent setting of the heat exchanger 200 facilitates installation, maintenance and replacement.

[0083] In the above-described embodiments, the description of each embodiment focuses on different aspects, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0084] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0085] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0086] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be connected, or detachable, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0087] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0088] In the description of the application, reference to "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that a particular feature, structure, material, or characteristic being described is included in at least one embodiment or example of the application. The appearances of the above expressions in various places in the description are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Moreover, the terms "first", "second", "third", etc. are used herein merely as identifiers for the various embodiments or examples, and are not intended to identify a particular order or sequence.

[0089] Obviously, various modifications and changes can be made to the present application without departing from the spirit and scope of the application. It is understood that such modifications and changes are intended to fall within the scope of the application, which is to be interpreted in the broadest sense possible. Accordingly, the proper scope of the application encompasses all such modifications and changes as can be made to the application without departing from the essential spirit of the application.

[0090] The above description is only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A heat exchange type electric water heater, characterized by comprising: The heat exchange type electric water heater comprises a heat preservation box, a heat exchanger, a circulating pump and an energy saver, and is provided with a water inlet and a water outlet. The heat preservation box is provided with a first heater for heating the heat exchange medium inside the heat preservation box. The heat exchanger is provided with a first connecting end and a second connecting end, and the circulating pump is connected between the heat preservation box and the first connecting end. The second connecting end is connected to the water inlet and the water outlet. The energy saver is connected to the heat preservation box for heating the heat exchange medium inside the heat preservation box.

2. The heat exchange electric water heater according to claim 1, wherein The heat exchange type electric water heater is further provided with a first temperature sensor and a second temperature sensor, and the first temperature sensor and the second temperature sensor are respectively located at the input end and the output end of the energy saver.

3. The heat exchange electric water heater according to claim 1, wherein The heat exchange type electric water heater is further provided with a reversing valve and a pipeline assembly, and the heat preservation box is provided with a first end, a second end and a third end. The pipeline assembly comprises a first pipeline, a second pipeline and a third pipeline, the second pipeline comprises a first sub-pipeline and a second sub-pipeline, and the first end, the first pipeline, the first connecting end, the reversing valve, the second sub-pipeline, the circulating pump and the second end are sequentially connected. The output end of the energy saver, the first sub-pipeline, the reversing valve, the second sub-pipeline, the circulating pump and the second end are sequentially connected. The third end, the third pipeline and the input end of the energy saver are sequentially connected.

4. The heat exchange electric water heater according to claim 3, wherein The heat exchange type electric water heater is further provided with a second heater and a water mixing valve, and the pipeline assembly further comprises a fourth pipeline, and the fourth pipeline is provided with a third sub-pipeline and a fourth sub-pipeline. The water inlet, the third sub-pipeline, the second connecting end, the second heater, the water mixing valve and the water outlet are sequentially connected. The fourth sub-pipeline is connected between the water inlet and the water mixing valve.

5. The heat exchange electric water heater according to claim 4, wherein The heat exchange type electric water heater is further provided with a third temperature sensor and a fourth temperature sensor, and the third temperature sensor and the fourth temperature sensor are respectively located at the input end and the output end of the water mixing valve.

6. The heat exchange electric water heater according to any one of claims 1-5, characterized in that, The energy saver is a solar flat plate collector or a waste heat recovery device.

7. The heat exchange electric water heater according to any one of claims 1-5, characterized in that, The heat exchange medium in the heat preservation box is water, oil or antifreeze.

8. The heat exchange electric water heater according to any one of claims 1-5, characterized in that, The heat preservation box is an open type heat preservation box or a pressure bearing type heat preservation box.

9. The heat exchange electric water heater according to claim 4, wherein The second heater is an instant heater.

10. The heat exchange electric water heater according to any one of claims 1-5, characterized in that, The heat exchanger is a plate type heat exchanger or a tube type heat exchanger.

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