Electric water heater

Abstract

The utility model discloses an electric water heater, including shell, water bladder, phase change bladder, circulation pipeline and switching device, and phase change bladder contains phase change material, and circulation pipeline is at least partially arranged in the shell, and switching device is arranged on circulation pipeline, the electric water heater still includes first trigger part and second trigger part, after first trigger part is triggered, switching device can be used to make circulation pipeline conduction, make hot water of water bladder can circulate and flow between water bladder and phase change bladder through circulation pipeline, still can be used for making water flow through phase change bladder and be heated by phase change material, and make water in water bladder and phase change bladder can flow to water terminal, after second trigger part is triggered, switching device can be used to make circulation pipeline not conduction, still can be used for making water of external water source supply or water in water bladder can flow to water terminal after flowing through phase change bladder. The electric water heater provided in the application embodiment can satisfy the different water demand of user, and can also avoid the appearance of dead water under the condition of small water quantity.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to an electric water heater. Background Technology

[0002] Traditional storage-type electric water heaters use water as the heat storage medium, and due to the limitation of water's specific heat capacity, the amount of hot water supplied is limited. Increasing the water volume requires a larger tank, taking up more indoor space. Furthermore, as hot water is released, the water temperature inside the tank gradually decreases, resulting in insufficient hot water temperature and volume to meet user needs. Overall, traditional storage-type electric water heaters, constrained by their size, have limited heat storage capacity and suffer from insufficient hot water supply.

[0003] To improve the heat storage capacity of electric water heaters and increase the hot water supply, phase change water heaters have emerged in existing technology. These water heaters rely on the physical state transformation of phase change materials to achieve heat storage and release. Before water is used, the phase change material absorbs heat from the heat source for heat storage.

[0004] Phase change water heaters have both heat storage and water supply functions. Users' water consumption needs vary depending on the specific water usage scenario. Meeting these diverse needs is a challenge for those skilled in the art. Furthermore, optimizing the water heater from health, energy-saving, and environmental perspectives to enhance the user experience, while simultaneously satisfying these needs, is a direction that urgently requires improvement.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides an electric water heater that can meet users' different water consumption needs, while also preventing stagnant water under low water consumption conditions, thus saving energy, protecting the environment, and improving the user experience.

[0007] The specific technical solution of this utility model embodiment is as follows:

[0008] An electric water heater includes: a shell, within which a water tank and a phase change tank are disposed, the phase change tank containing a phase change material for heat storage and release; a circulation pipe, at least partially disposed within the shell, for connecting the water tank and the phase change tank; and a switching device disposed on the circulation pipe. The electric water heater further includes a first trigger and a second trigger. When the first trigger is triggered, the switching device can be used to open the circulation pipe, allowing hot water from the water tank to circulate between the water tank and the phase change tank through the circulation pipe. The switching device can also be used to allow water flowing through the phase change tank to be heated by the phase change material, and to allow water in the water tank and the phase change tank to flow to a water-using terminal. When the second trigger is triggered, the switching device can be used to de-open the circulation pipe. The switching device can also be used to allow water supplied from an external water source or water from the water tank to flow to a water-using terminal after passing through the phase change tank.

[0009] In a preferred embodiment, the water tank is equipped with a heating element; the phase change tank is equipped with a heat exchanger, through which water flowing through the heat exchanger can absorb heat from or conduct heat to the phase change material; after the first trigger is triggered, the switching device can be used to open the circulation pipeline, allowing water heated by the heating element in the water tank to circulate between the water tank and the heat exchanger through the circulation pipeline; the switching device can also be used to allow water flowing through the phase change tank to be heated by the phase change material, and to allow water in the water tank and the heat exchanger to flow to the water terminal; after the second trigger is triggered, the switching device can be used to de-open the circulation pipeline; the switching device can also be used to allow water supplied from an external water source or water in the water tank to flow to the water terminal after passing through the heat exchanger.

[0010] In a preferred embodiment, the switching device is a temperature regulating valve, and the electric water heater further includes a water supply pipeline. One side of the water supply pipeline is used to connect to an external water source, and the other side of the water supply pipeline is used to connect to the circulation pipeline and / or the heat exchanger and / or the water tank through the temperature regulating valve. The temperature regulating valve can be used to divert the water supply in the water supply pipeline, with part of the water supply flowing into the heat exchanger and the water tank, and the other part of the water supply mixing with the water flowing out from the heat exchanger and the water tank.

[0011] In a preferred embodiment, the heat exchanger and the water tank can be connected in series through the circulation pipeline to supply water, and the temperature control valve can be used to allow a portion of the water supply in the water supply pipeline to flow sequentially into the heat exchanger and the water tank.

[0012] In a preferred embodiment, the circulation pipeline includes a first circulation pipeline and a second circulation pipeline. The first circulation pipeline has a first inlet and a first outlet, with the first inlet located in the water tank and the first outlet located in the phase change tank. The second circulation pipeline has a second inlet and a second outlet, with the second inlet located in the phase change tank and the second outlet located in the water tank. The temperature control valve is disposed on either the first circulation pipeline or the second circulation pipeline.

[0013] In a preferred embodiment, the first water inlet is located at the upper part of the water tank, the first water outlet is located at the upper part of the phase change tank, the second water inlet is located at the lower part of the phase change tank, and the second water outlet is located at the lower part of the water tank.

[0014] In a preferred embodiment, the temperature control valve is disposed on the first circulation pipeline, and the other side of the water supply pipeline is connected to the first circulation pipeline through the temperature control valve; the temperature control valve can be used to divert the water supply in the water supply pipeline, with part of the water supply flowing into the heat exchanger, the water flowing out of the heat exchanger entering the water tank through the second circulation pipeline, and the water flowing out of the water tank flowing out through the first circulation pipeline, and the remaining part of the water supply can mix with the water flowing out of the water tank.

[0015] In a preferred embodiment, the temperature control valve includes at least a first interface, a second interface, and a third interface. The first interface is used to connect to the other side of the water supply pipeline, and the second and third interfaces are both connected to the first circulation pipeline. The temperature control valve can be used to allow water in the water tank to circulate between the water tank and the heat exchanger. Along the water flow direction, the third interface and the second interface are sequentially connected. The temperature control valve can also be used to prevent the third interface from connecting to the second interface, so that the water in the water tank does not circulate between the water tank and the heat exchanger.

[0016] In a preferred embodiment, the temperature control valve can be used to enable the first interface to be connected to the second interface and the third interface.

[0017] In a preferred embodiment, the temperature control valve is used to structurally connect the first interface to the second interface and / or the third interface, but not to conduct water.

[0018] In a preferred embodiment, the electric water heater further includes a water outlet pipe, one end of which is used to connect to the circulation pipe or the temperature control valve, and the other end of which is used to connect to the water terminal.

[0019] In a preferred embodiment, the phase change tank is located above the water tank or is positioned to the left and right of the water tank, and the hot water in the water tank can circulate naturally between the water tank and the phase change tank through the circulation pipe.

[0020] In a preferred embodiment, a heating element is provided in the middle or lower part of the water tank; the phase change tank is located above the water tank; the phase change tank is provided with a heat exchanger, through which water can absorb heat from or conduct heat to the phase change material; the electric water heater further includes a switching device, which is detachably installed on the phase change tank; the circulation pipeline includes a first circulation pipeline and a second circulation pipeline, one end of the first circulation pipeline is connected to the water tank, and the other end is connected to the heat exchanger through the switching device; one end of the second circulation pipeline is connected to the heat exchanger, and the other end is connected to the water tank; the electric water heater further includes a water supply pipeline and a water outlet pipeline, one end of the water supply pipeline can be connected to a water source, and the other end is connected to the switching device; one end of the water outlet pipeline is connected to the switching device, and the other end is used to connect to a water terminal; the switching device, the circulation pipeline, the water supply pipeline, and the water outlet pipeline are combined to form a water circuit assembly; at least a portion of the water circuit assembly is disposed in the outer casing.

[0021] In a preferred embodiment, both the phase change tank and the water tank extend horizontally, the phase change tank is shorter than the water tank, and one end of the phase change tank forms an installation space between the water tank and the end cap of the housing to accommodate the water circuit assembly.

[0022] In a preferred embodiment, the housing has opposing front and rear sides, the water circuit assembly is disposed near the rear side of the housing, and the electric water heater further includes a circuit board disposed near the front side of the housing.

[0023] In a preferred embodiment, the switching device is located above the rear side of the housing, and the inlet of the water supply pipe and the outlet of the water outlet pipe are located below the rear side of the housing.

[0024] In a preferred embodiment, the computer board is positioned above the front side of the housing.

[0025] In a preferred embodiment, the switching device includes a valve body, a valve core disposed within the valve body, and a motor for driving the valve core to move. The valve body includes a first interface, a second interface, a third interface, and a fourth interface. The first interface is used to connect to the water supply pipeline, the second interface is used to seal and connect to the phase change tank, the third interface is connected to the other end of the first circulation pipeline, and the fourth interface is connected to the water outlet pipeline.

[0026] In a preferred embodiment, the first interface, the third interface, and the fourth interface all face the end cap of the housing.

[0027] In a preferred embodiment, the second interface and the third interface are positioned closer to the valve core than the first interface and the second interface.

[0028] In a preferred embodiment, the motor is located at the top of the valve body.

[0029] In a preferred embodiment, at least one of the water supply pipeline, the water outlet pipeline, and the circulation pipeline is a flexible connecting pipe.

[0030] In a preferred embodiment, the flexible connecting pipe includes a PPR pipe and / or a metal corrugated pipe.

[0031] In a preferred embodiment, the connector of the flexible connecting tube is a metal part or a metal insert set on a plastic material.

[0032] In a preferred embodiment, the end of the phase change chamber is provided with a flow channel for connecting the switching device and the heat exchanger, the flow channel serving as part of the circulation pipeline.

[0033] In a preferred embodiment, the phase change chamber has a first end plate and a second end plate at opposite ends. The first end plate is located outside the second end plate, and the first end plate protrudes outward by a first predetermined dimension at a first predetermined position to form the drainage channel; or, the second end plate protrudes inward by a first predetermined dimension at a second predetermined position to form the drainage channel; or, the first end plate protrudes outward by a second predetermined dimension at a first predetermined position and the second end plate protrudes inward by a third predetermined dimension at a second predetermined position, with the first and second predetermined positions at least partially opposite each other to form the drainage channel; or, the phase change chamber further includes a third end plate located outside the first end plate. The third end plate protrudes outward by a first predetermined dimension at a first predetermined position to form the drainage channel; or, the phase change chamber further includes a fourth end plate located inside the second end plate, the fourth end plate protruding inward by a first predetermined dimension at the second predetermined position to form the drainage channel; or, the phase change chamber further includes a fifth end plate located inside the second end plate, the first end plate protruding outward by a fourth predetermined dimension at a first predetermined position, the fifth end plate protruding inward by a fifth predetermined dimension at a fifth predetermined position, and the second end plate forming an opening at a position corresponding to the first predetermined position and the fifth predetermined position, the first end plate, the second end plate, and the fifth end plate cooperating to form the drainage channel.

[0034] In a preferred embodiment, the drainage channel extends longitudinally along the height direction, the upper part of the drainage channel is connected to the water inlet of the heat exchanger, and the switching device is sealed and connected to the lower part of the drainage channel.

[0035] The technical solution of this utility model has the following significant beneficial effects:

[0036] The electric water heater provided in this application embodiment has a switching device on the circulation pipeline, and also has a first trigger and a second trigger. When the first trigger is triggered, the electric water heater enters a first mode. When the electric water heater does not produce water, the switching device can be used to open the circulation pipeline, and the water in the water tank can circulate between the water tank and the heat exchanger. The water temperature in the water tank is raised, and the phase change material in the phase change tank is heated. When the user uses water later, the water flowing through the phase change tank can be heated by the phase change material. The water in the water tank and the phase change tank can flow to the water terminal, thereby enabling the electric water heater to meet the user's large water consumption needs.

[0037] When the second trigger is activated, the water heater enters the second mode. When the water heater does not dispense water, the switching device disconnects the circulation pipe, preventing hot water in the tank from circulating between the tank and the phase change tank. This hot water does not store heat in the phase change material within the tank. Subsequent water usage can then be accommodated by the water heater for smaller volumes. Furthermore, during water usage, the switching device ensures that water supplied from an external source or from the tank flows through the phase change tank before reaching the user. This prevents bacterial growth caused by prolonged stagnation of water in the phase change tank due to lack of use. It also achieves energy savings and reduces unnecessary phase changes in the phase change material, extending its lifespan.

[0038] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, embodiments of the present invention include many changes, modifications, and equivalents. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0039] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0040] Figure 1 This is a schematic diagram of the water flow when the electric water heater provided in the embodiment of this application is in the first mode and no water is being dispensed;

[0041] Figure 2 This is a schematic diagram of the water flow when the electric water heater provided in the embodiment of this application is in the second mode and no water is being dispensed;

[0042] Figure 3 This is one of the schematic diagrams of water flow when the electric water heater is in the outlet state provided in the embodiments of this application;

[0043] Figure 4 This is a schematic diagram of the structure of an electric water heater provided in the embodiments of this application;

[0044] Figure 5 for Figure 4 A side view of an electric water heater;

[0045] Figure 6 for Figure 5 Sectional view at point AA;

[0046] Figure 7 This is a side view of a phase change tank of an electric water heater provided in an embodiment of this application;

[0047] Figure 8 This is one of the schematic diagrams showing the two end plates of the phase change tank of an electric water heater forming a flow channel in an embodiment of this application;

[0048] Figure 9 This is a second schematic diagram of the drainage channel of a phase change tank in an electric water heater provided in the embodiments of this application;

[0049] Figure 10 This is the third schematic diagram of the drainage channel of the phase change tank of an electric water heater provided in the embodiments of this application;

[0050] Figure 11 This is the fourth schematic diagram of the drainage channel of the phase change tank of an electric water heater provided in the embodiments of this application;

[0051] Figure 12 This is the fifth schematic diagram of the drainage channel of the phase change tank of an electric water heater provided in the embodiments of this application;

[0052] Figure 13 This is the sixth schematic diagram of the drainage channel of the phase change tank of an electric water heater provided in the embodiments of this application;

[0053] Figure 14 This is a second schematic diagram of water flow when the electric water heater is in the outlet position according to the embodiments of this application;

[0054] Figure 15 This is the third schematic diagram of water flow when the electric water heater is in the outlet state according to the embodiments of this application;

[0055] Figure 16 This is the fourth schematic diagram of water flow when the electric water heater is in the outlet state according to the embodiments of this application;

[0056] Figure 17 This is the fifth schematic diagram of water flow when the electric water heater is in the outlet position according to the embodiments of this application.

[0057] Reference numerals in the figures of this application:

[0058] 1. Phase change cylinder;

[0059] 10. Drainage channel;

[0060] 11. First end plate;

[0061] 12. Second end plate;

[0062] 13. Third end plate;

[0063] 14. Fourth end plate;

[0064] 15. Fifth end plate;

[0065] 2. Water tank;

[0066] 3. Heating element;

[0067] 41. First circulation pipeline;

[0068] 411. First water inlet end;

[0069] 412. First water outlet;

[0070] 42. Second circulation pipeline;

[0071] 421. Second water inlet;

[0072] 422. Second water outlet;

[0073] 5. Heat exchanger;

[0074] 6. Pump;

[0075] 7. Outer casing;

[0076] 81. Water supply pipelines;

[0077] 82. Water outlet pipe;

[0078] 9. Switching device;

[0079] 90. Valve body;

[0080] 91. First interface;

[0081] 92. Second Interface

[0082] 93. Third interface;

[0083] 94. Fourth interface;

[0084] 96. Sixth Interface;

[0085] X, horizontal direction;

[0086] Y, the height direction. Detailed Implementation

[0087] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0088] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0089] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0090] This utility model provides an electric water heater that can meet the different water consumption needs of users, while also preventing stagnant water under low water consumption conditions, saving energy, protecting the environment, and improving the user experience.

[0091] Please refer to the following for comprehensive information. Figures 1 to 17 This application specification provides an electric water heater, which may include: a housing 7, within which a water tank 2 and a phase change tank 1 are disposed, the phase change tank 1 containing a phase change material for heat storage and release; a circulation pipe, at least partially disposed within the housing 7, for connecting the water tank 2 and the phase change tank 1; and a switching device 9 disposed on the circulation pipe. The electric water heater further includes a first trigger and a second trigger; after the first trigger is triggered, the switching device 9 can... The switching device 9 can also be used to make the water flow through the phase change material in the phase change tank 1 and allow the hot water in the water tank 2 to circulate between the water tank 2 and the phase change tank 1. The switching device 9 can also be used to make the water flow through the phase change tank 1 and be heated by the phase change material, and to make the water in the water tank 2 and the phase change tank 1 flow to the water terminal. After the second trigger is triggered, the switching device 9 can be used to make the circulation pipeline disconnected. The switching device 9 can also be used to make the water supplied by the external water source or the water in the water tank 2 flow to the water terminal after flowing through the phase change tank 1.

[0092] In this embodiment, the electric water heater may include a phase change tank 1, a water tank 2, a circulation pipe, a shell 7, a switching device 9, etc.

[0093] The phase change chamber 1 contains a phase change material for heat storage and release. The phase change material's physical state can change, thereby switching between its heat storage and heat release states. The specific material of the phase change material can be inorganic water and salt with added nucleating agents, or it can be in other forms, such as water; this application does not impose specific limitations. In the embodiments of this application, taking a phase change material capable of switching between solid and liquid states as an example, when the phase change material changes from solid to liquid, it is in a heat storage state, absorbing and storing external heat; when the phase change material changes from liquid to solid, it is in a heat release state, releasing the stored heat.

[0094] The phase change material in the phase change tank 1 can be disposed in the phase change tank 1 by filling or other methods. When the phase change material is disposed in the phase change tank 1 by filling, a heat exchanger 5 can be disposed inside the phase change tank 1. Cold water flowing through the heat exchanger 5 can absorb heat from the phase change material to achieve preheating; hot water flowing through the heat exchanger 5 can release heat to the phase change material to achieve heat storage of the phase change material. The heat exchanger 5 can be in the form of a heat exchange tube, which can extend from top to bottom in the height direction Y and reciprocate in the left and right directions. In addition, the heat exchanger 5 can also be in other forms. In the embodiments and drawings of this application, the heat exchanger 5 is mainly illustrated by the form of a heat exchange tube.

[0095] Of course, in some embodiments, the phase change material inside the phase change tank 1 can be encapsulated, in which case the heat exchanger 5 may not be installed inside the phase change tank 1. In this embodiment, the example is mainly illustrated by the form in which the phase change tank 1 has a heat exchanger 5 installed inside.

[0096] The water tank 2 has a water storage cavity inside. Generally, the volume of the water tank 2 is at least a predetermined volume (e.g., 10 liters or more). When the volume of the water tank 2 is 10 liters or more, it can reliably provide the heat required for heat storage to the phase change material in the phase change tank 1, ensuring that the phase change material can store heat efficiently. In addition, when the volume of the water tank 2 is large, water can be supplied to the water terminal at a relatively stable water temperature using the water tank 2. Of course, the possibility of a small-capacity water tank 2 is not excluded in this application. In some special cases (e.g., scenarios with limited installation space), the volume of the water tank 2 may be less than 10L.

[0097] In some embodiments, the water tank 2 and the phase change tank 1 can be arranged vertically. For example, the water tank 2 can be located above or below the phase change tank 1. The phase change tank 1 and the water tank 2 can be installed horizontally, with their axes extending along the horizontal direction X. In this case, the axes of the phase change tank 1 and the water tank 2 can be arranged vertically. Of course, in the embodiments of this application, vertical installation of the water tank 2 and the phase change tank 1 is also possible. If the water tank 2 and the phase change tank 1 are installed vertically, their axes extend along the vertical direction Y. In this case, the axes of the phase change tank 1 and the water tank 2 can be arranged horizontally. Alternatively, the relative positional relationship and structure of the water tank 2 and the phase change tank 1 can also take other forms, which are not specifically limited here.

[0098] The electric water heater may further include a heating element 3, which can be used to heat the water in the water tank 2. The heating element 3 can be an electric heating element, such as a heating rod. Of course, the heating element 3 can also take other forms; in this embodiment, a heating rod is mainly used as an example. The heating rod can be installed inside the water tank 2, or it can be located outside the water tank 2, such as on the outer surface of the water tank 2, or it can be installed in the circulation pipe, etc. In the embodiments and accompanying drawings of this application, the heating element 3 is mainly illustrated as a heating rod installed inside the water tank 2. When the heating element 3 is installed inside the water tank 2, it can not only be used to heat the water in the water tank 2, but also to heat the water in the circulation pipe, providing heat to the water in the circulation pipe for use in the phase change material.

[0099] The phase change tank 1 may or may not contain a heating element 3. In the case where the phase change tank 1 does not contain a heating element 3, when the phase change material in the phase change tank 1 needs heat storage, it can absorb the heat from the water heated by the heating element 3 in the water tank 2. In this embodiment, the example is provided where the water tank 2 contains a heating element 3 and the phase change tank 1 does not.

[0100] The electric water heater also includes a circulation pipe, one function of which is to connect the water tank 2 and the phase change tank 1. When the phase change tank 1 is equipped with a heat exchanger 5, the circulation pipe can specifically be used to connect the water tank 2 and the heat exchanger 5.

[0101] In this embodiment, the electric water heater may include a first mode and a second mode. The available hot water volume of the electric water heater differs between the first and second modes. Specifically, the available hot water volume of the electric water heater in the first mode is greater than that in the second mode. Users can choose the corresponding mode according to their usage needs. When the electric water heater is in the first mode, it can meet the user's demand for large water usage. When the electric water heater is in the second mode, it can prevent problems such as bacterial growth caused by prolonged stagnation of water in the phase change tank 1 due to long-term disuse; in addition, it can achieve energy saving. For example, if the user's water consumption is less than the amount of hot water the electric water heater can provide, and if the hot water in the electric water heater is not fully utilized, it will be diluted and cooled by subsequently added cold water and will undergo natural cooling, requiring reheating to the set temperature before the next use, thus effectively consuming electrical energy.

[0102] In this embodiment, the electric water heater can be equipped with trigger units for different modes. For example, a first trigger unit is provided for the first mode, and a second trigger unit is provided for the second mode. Specifically, the first and second trigger units can be located on the outer casing 7, integrated into a mobile terminal APP, or located on a remote control, etc. For example, taking the first and second trigger units as being located on the outer casing 7, they can specifically be touch buttons located on the outer casing 7. When the first trigger unit is triggered, the electric water heater enters the first mode; when the second trigger unit is triggered, the electric water heater enters the second mode. The circuit board of the electric water heater can be electrically connected to the first and second trigger units, and when either the first or second trigger unit is triggered, the circuit board can receive the corresponding trigger signal.

[0103] Specifically, when the first trigger is triggered, in the first mode, when the electric water heater does not dispense water, the hot water in the water tank 2 can circulate between the water tank 2 and the phase change tank 1 through the circulation pipe to store heat in the phase change material; when the electric water heater dispenses water, the water flowing through the phase change tank 1 can be heated by the phase change material, and the water in the water tank 2 and the phase change tank 1 can flow to the water terminal.

[0104] In this first mode, when the water heater is not dispensing water, it heats the water in tank 2 during heat storage. This heated water circulates between tank 2 and phase change tank 1 via a circulation pipe, maximizing the heat storage capacity of the phase change material in tank 1. When the water heater dispenses water, taking a series connection of tank 1 and tank 2 as an example, external water first flows through tank 1 and is heated by the phase change material before flowing into tank 2. Water in tank 2 can then be discharged to the user's end. Alternatively, taking a parallel connection of tank 1 and tank 2 as an example, some external water flows into tank 1 and is heated by the phase change material. Water in tank 1 is then discharged to the user's end, while some flows into tank 2. Water in tank 2 can also be discharged to the user's end. Overall, the heat in tank 1 and tank 2 is fully utilized, providing the user with the maximum water consumption and meeting their high-volume water needs.

[0105] When the second trigger is triggered, in the second mode of the electric water heater, when the electric water heater does not produce water, the circulation pipe is not open, and the hot water in the water tank 2 cannot circulate between the water tank 2 and the phase change tank 1 through the circulation pipe; when the electric water heater produces water, the water supplied by the external water source or the water in the water tank 2 can flow to the water terminal after passing through the phase change tank 1.

[0106] In this second mode, when the water heater is not dispensing water, the circulation pipe is not open. During heat storage, the hot water in tank 2 cannot flow into phase change tank 1 through the circulation pipe, thus the phase change material in tank 1 is not heated. At this time, the heat in the water heater is only provided by the hot water in tank 2. When the water heater dispenses water, taking the case of phase change tank 1 and tank 2 dispensing water in series as an example, the external water supply can first flow through phase change tank 1 and then into tank 2, where the water can be discharged to the user terminal. Alternatively, taking the case of phase change tank 1 and tank 2 dispensing water in parallel as an example, part of the external water supply can flow into phase change tank 1, and then the water in phase change tank 1 is discharged to the user terminal, while some flows into tank 2, where the water can also be discharged to the user terminal. Overall, because there is no hot water flowing through tank 2 in phase change tank 1 when the water heater is not dispensing water, the phase change material in phase change tank 1 is not stored.

[0107] In the second mode described above, when the electric water heater dispenses water, it can meet the user's small water usage needs without wasting excess heat, thus saving energy and protecting the environment. Furthermore, it reduces the number of unnecessary phase changes performed by the phase change material in the phase change tank 1, which helps extend the material's lifespan. Since the circulation pipe is not open when the water heater is not dispensing water, it does not store heat in the phase change material. However, when water is dispensing, the circulation pipe is open, allowing the water stored in the phase change tank 1 to be displaced, preventing bacterial growth due to prolonged stagnation and ensuring a safe and satisfactory user experience.

[0108] Furthermore, under certain operating conditions, when the electric water heater switches from the first mode to the second mode, if the heat stored in the phase change material is not effectively utilized in the first mode and there is still residual heat, when switching to the second mode, when the electric water heater needs to dispense water, the water flows through the phase change tank 1. Compared to the design of directly short-circuiting the phase change tank 1, the heat in the phase change material can be fully utilized, achieving further energy saving and environmental protection.

[0109] In some embodiments, the water tank 2 may be equipped with a heating element 3; the phase change tank 1 may be equipped with a heat exchanger 5, through which water flowing through the heat exchanger 5 can absorb heat from the phase change material or conduct heat to the phase change material; the electric water heater may also include a switching device 9, which is installed in the circulation pipeline and can be used to control the conduction state of the circulation pipeline.

[0110] In the case where the water tank 2 is equipped with a heating element 3 and the phase change tank 1 is equipped with a heat exchanger 5, the circulation pipeline connects the water tank 2 and the heat exchanger 5. The circulation pipeline is equipped with a switching device 9, which can be used to control the conduction state of the circulation pipeline. For an electric water heater with the above-described structural configuration, in the first mode, when the electric water heater does not dispense water, the switching device 9 enables the circulation pipe to be open, allowing the water heated by the heating element 3 in the water tank 2 to circulate between the water tank 2 and the heat exchanger 5 through the circulation pipe; when the electric water heater dispenses water, the water flowing through the phase change tank 1 can be heated by the phase change material, and the water in the water tank 2 and the heat exchanger 5 can flow to the water terminal; in the second mode, when the electric water heater does not dispense water, the switching device 9 disables the circulation pipe, preventing the water heated by the heating element 3 in the water tank 2 from circulating between the water tank 2 and the heat exchanger 5 through the circulation pipe; when the electric water heater dispenses water, the water supplied from an external water source or the water in the water tank 2 can flow to the water terminal after passing through the heat exchanger 5.

[0111] The technical effects produced by the electric water heater in the above embodiments can be compared with the description of the above embodiments, and will not be repeated here.

[0112] For an electric water heater equipped with a switching device 9, the water flow relationship in the water heater will vary depending on the specific function of the switching device 9, its position on the water line, and its relationship with the circulation pipe.

[0113] In some embodiments, in the first mode, when the electric water heater does not dispense water, the switching device 9 enables the circulation pipeline to be open, allowing the water heated by the heating element 3 in the water tank 2 to circulate between the water tank 2 and the heat exchanger 5 through the circulation pipeline; when the electric water heater dispenses water, water supplied from an external water source flows into the heat exchanger 5 and is heated by the phase change material, and the water in the heat exchanger 5 flows into the water tank 2, where the water flows to the water terminal; alternatively, water supplied from an external water source flows into the water tank 2, and the water in the water tank 2 flows into the heat exchanger 5 and is heated by the phase change material, and the heat exchange... Water in the water heater 5 can flow to the water terminal; in the second mode, when the electric water heater does not produce water, the switching device 9 can prevent the circulation pipeline from being open, and the water heated by the heating element 3 in the water tank 2 cannot circulate between the water tank 2 and the heat exchanger 5 through the circulation pipeline; when the electric water heater produces water, water supplied from an external water source can flow into the heat exchanger 5, and the water in the heat exchanger 5 can flow into the water tank 2, and the water in the water tank 2 can flow to the water terminal, or, water supplied from an external water source can flow into the water tank 2, and the water in the water tank 2 can flow into the heat exchanger 5, and the water in the heat exchanger 5 can flow to the water terminal.

[0114] In this embodiment, such as Figure 1 As shown, after the first trigger is triggered, in the first mode, when the electric water heater does not dispense water, the switching device 9 can open the circulation pipe, allowing the water heated by the heating element 3 in the water tank 2 to circulate between the water tank 2 and the heat exchanger 5 through the circulation pipe. Figure 2 As shown, after the second trigger is triggered, in the second mode, when the electric water heater does not dispense water, the switching device 9 can prevent the circulation pipe from being open. The water heated by the heating element 3 in the water tank 2 cannot circulate between the water tank 2 and the heat exchanger 5 through the circulation pipe. In the same water system, the switching device 9 can easily switch the circulation pipe's open / closed state in different modes, thus achieving differentiated design for phase change material heat storage and non-heat storage.

[0115] like Figure 3 or Figure 14As shown, in either the first or second mode, when the electric water heater dispenses water, the switching device 9 works in conjunction with the circulation pipe to achieve a series water outlet path between the water tank 2 and the phase change tank 1. In the series water outlet path achieved by the switching device 9 and the circulation pipe, the water flow path is the same in both the first and second modes. The only difference lies in whether the phase change material itself has heat storage capacity, and whether the water can be heated when it flows through the heat exchanger 5 of the phase change tank 1. Overall, the water circuit design is ingenious and highly reliable in use.

[0116] In other embodiments, in the first mode, when the electric water heater does not dispense water, the switching device 9 enables the circulation pipeline to be open, allowing the water heated by the heating element 3 in the water tank 2 to circulate between the water tank 2 and the heat exchanger 5 through the circulation pipeline; when the electric water heater dispenses water, some of the water supplied from the external water source flows into the heat exchanger 5 to be heated by the phase change material, and some of it flows into the water tank 2, with the water in the heat exchanger 5 and the water tank 2 flowing towards the water terminal; in the second mode, when the electric water heater does not dispense water, the switching device 9 disables the circulation pipeline, preventing the water heated by the heating element 3 in the water tank 2 from circulating between the water tank 2 and the heat exchanger 5 through the circulation pipeline; when the electric water heater dispenses water, some of the water supplied from the external water source flows into the heat exchanger 5, and some of it flows into the water tank 2, with the water in the heat exchanger 5 and the water tank 2 flowing towards the water terminal.

[0117] The main difference between this embodiment and the above-described embodiments lies in the water circuit connection. In this embodiment, in either the first or second mode, when the electric water heater dispenses water, the switching device 9 cooperates with the circulation pipeline to achieve parallel water dispensing from the water tank 2 and the phase change tank 1. The technical effects produced by this embodiment can be referred to in the above-described embodiments, and will not be repeated here.

[0118] In one embodiment, the switching device 9 is a temperature regulating valve, and the electric water heater further includes a water supply pipe 81. One side of the water supply pipe 81 is used to connect to an external water source, and the other side of the water supply pipe 81 is used to connect to the circulation pipe and / or the heat exchanger 5 and / or the water tank 2 through the temperature regulating valve. When the electric water heater dispenses water, under the control of the temperature regulating valve, the water supply in the water supply pipe 81 can be diverted by the temperature regulating valve. Part of the water supply flows into the heat exchanger 5 and the water tank 2, and the other part of the water supply can mix with the water flowing out from the heat exchanger 5 and the water tank 2.

[0119] In this embodiment, when the switching device 9 is a temperature regulating valve, it can control the flow pattern and flow ratio of water in the electric water heater. Specifically, the specific function of the temperature regulating valve can vary depending on its installation location, the mode of the electric water heater, and the water outlet status.

[0120] The electric water heater may also include a water supply pipe 81, one side of which can be connected to a water source, and the other side of which is used to connect to the circulation pipe and / or the heat exchanger 5 and / or the water tank 2 through the temperature regulating valve.

[0121] When the electric water heater dispenses water, the temperature control valve can be used for diversion. The water supply flowing into the water supply pipe 81 can first flow into the temperature control valve and be diverted according to a predetermined ratio. Alternatively, the temperature control valve can also be used for confluence. The hot water heated by the heat exchanger 5 and / or the water tank 2 and part of the water supply flowing into the water supply pipe 81 can be combined in the temperature control valve according to a predetermined ratio, thereby cooperating with the circulation pipe to achieve control of different flow patterns and flow ratios of water.

[0122] When the electric water heater is in heating mode, the temperature control valve can be used to open or close the circulation pipe. In the first mode, the temperature control valve opens the circulation pipe, allowing water in the water tank 2 to circulate between the water tank 2 and the heat exchanger 5, thereby enabling the hot water in the water tank 2 to store heat on the phase change material in the phase change tank 1 as it flows through the heat exchanger 5. In the second mode, the temperature control valve closes the circulation pipe, preventing the water in the water tank 2 heated by the heating element 3 from circulating between the water tank 2 and the heat exchanger 5 through the circulation pipe.

[0123] When the temperature control valve is used for diversion, the water supply flowing through the valve is relatively cold, which is room temperature water. This helps to extend the service life of the temperature control valve, reduce the heat resistance requirements of the valve's components (especially electronic components), and also reduce the risk of scaling.

[0124] Specifically, when the temperature regulating valve is used to divert the water supply flowing into the water supply pipe 81, under the control of the temperature regulating valve, part of the water supply flows into the heat exchanger 5 and / or the water tank 2, while the other part of the water supply mixes with the water flowing out of the heat exchanger 5 and / or the water tank 2. The specific location of this water supply flow can vary depending on the different relationships constructed between the water tank 2 and the phase change tank 1, such as series outlet, parallel outlet, or single tank outlet, in the circulation pipe equipped with the temperature regulating valve.

[0125] When the temperature control valve is used to combine the outgoing water, under the control of the temperature control valve, a portion of the water supplied in the water supply pipeline 81 flows into the heat exchanger 5 and / or the water tank 2, and the water flowing out of the heat exchanger 5 and / or the water tank 2 flows into the temperature control valve. The other portion of the water supplied in the water supply pipeline 81 flows directly into the temperature control valve. After the two portions of water flowing into the temperature control valve are mixed, the water temperature can reach or approach the target outlet water temperature set by the user, thereby providing the user with water that meets the set requirements.

[0126] In some embodiments, under the control of the temperature regulating valve, a portion of the water supply flows into the heat exchanger 5, and another portion flows into the water tank 2. The water flowing out of the heat exchanger 5 and the water flowing out of the water tank 2 mix. In this case, the temperature regulating valve can be used when the heat exchanger 5 and the water tank 2 are connected in parallel for water output and mixing, without the need for additional water supply to be separated for mixing. In this situation, the temperature regulating valve can be used to divert the water supply or to merge the outflow.

[0127] The electric water heater provided in this application embodiment has a temperature regulating valve installed on the circulation pipeline. In the second mode, when it is not necessary to store heat for the phase change material in the phase change tank 1, the temperature regulating valve can be used to prevent the circulation pipeline from being open.

[0128] In the first mode, when heat storage of the phase change material in phase change tank 1 is required, the temperature control valve can be used to open the circulation pipeline, allowing water in water tank 2 to circulate between water tank 2 and heat exchanger 5. The heated water in water tank 2 flows into phase change tank 1 through the circulation pipeline and then returns to water tank 2, thus achieving circulation. During this circulation process, the hot water in water tank 2 exchanges heat with the phase change material in phase change tank 1, improving the uniformity of heating the phase change material, increasing the heat exchange efficiency during the heat storage stage, shortening the heat storage time, reducing user waiting time, and enhancing the user experience.

[0129] When users need water, the temperature control valve can be switched between storing heat in the electric water heater and supplying water to the user. The water circuit design is ingenious and the pipe structure is simple.

[0130] When supplying water to users, the temperature regulating valve can be used in conjunction with the water supply pipe 81 and the circulation pipe to form a predetermined water outlet pattern (such as series water outlet, parallel water outlet or single tank water supply). The temperature regulating valve installed in the circulation pipe can control the flow path and flow ratio of the water in the electric water heater, so that the electric water heater can output water with a temperature that meets the user's set requirements.

[0131] In this embodiment, a clever design of the circulation pipeline equipped with a temperature-regulating valve enables multi-functional reuse at different stages. For example, when the electric water heater is in the non-discharge state of the first mode, the circulation pipeline serves as a connecting pipeline linking the water tank 2 and the phase change tank 1. When the electric water heater is in the discharge state, the circulation pipeline equipped with the temperature-regulating valve cooperates with the water supply pipeline 81 to output water at a temperature that meets the user's set requirements to the water terminal. Through the above-mentioned clever design of the water circuit, while meeting the functional requirements of different stages, it can also effectively reduce manufacturing costs, shrink the size, and meet the user's constant temperature water demand.

[0132] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0133] In some embodiments, the heat exchanger 5 and the water tank 2 can be connected in series to supply water through the circulation pipeline. When the electric water heater supplies water, a portion of the water supply in the water supply pipeline 81 can flow directly or sequentially into the heat exchanger 5 and the water tank 2 through the temperature regulating valve. Alternatively, a portion of the water supply in the water supply pipeline 81 can flow directly or sequentially into the water tank 2 and the heat exchanger 5 through the temperature regulating valve.

[0134] Please refer to the following: Figure 3 and Figure 14 In this embodiment, the heat exchanger 5 and the water tank 2 can be connected in series via a circulation pipeline. Specifically, when the electric water heater dispenses water, if the temperature control valve is used to divert the water supply flowing into the water supply pipeline 81, then a portion of the water supply in the water supply pipeline 81 can first flow into the temperature control valve. After being diverted by the temperature control valve, a portion of the water supply flows sequentially into the heat exchanger 5 and the water tank 2, or sequentially into the water tank 2 and the heat exchanger 5; the remaining portion of the water supply can be used as cold water for mixing, thereby adjusting the outlet water temperature.

[0135] When the electric water heater dispenses water, if the temperature control valve is used to combine the water flow, the water supply pipe 81 can be connected to the circulation pipe for diversion. Part of the water flowing into the water supply pipe 81 can flow directly into the heat exchanger 5 and the water tank 2 in sequence, or flow into the water tank 2 and the heat exchanger 5 in sequence. The hot water flowing out of the water tank 2 or the heat exchanger 5 can flow into the temperature control valve. The other part, which is used for mixing, can also flow into the temperature control valve. The hot and cold water can be mixed in the temperature control device to adjust the outlet water temperature.

[0136] In this embodiment, when the electric water heater is in the first mode, the phase change tank 1 and the water tank 2 are connected through the circulation pipe. During the start-up process of the heating element 3, no additional power source is required, and the water can circulate naturally in the circulation pipe. This simplifies the system, reduces energy consumption, effectively controls the overall cost, and does not generate noise that disturbs the user.

[0137] One of the purposes of setting up a circulation pipeline between the phase change tank 1 and the water tank 2 is to allow the heated hot water in the water tank 2 to flow into the phase change tank 1 through natural convection.

[0138] Specifically, the circulation pipeline may include a first circulation pipeline 41 and a second circulation pipeline 42. The first circulation pipeline 41 has a first water inlet 411 and a first water outlet 412. The first water inlet 411 is located in the water tank 2, and the first water outlet 412 is located in the phase change tank 1. The second circulation pipeline 42 has a second water inlet 421 and a second water outlet 422. The second water inlet 421 is located in the phase change tank 1, and the second water outlet 422 is located in the water tank 2. The temperature regulating valve is installed on the first circulation pipeline 41 or the second circulation pipeline 42.

[0139] The water tank 2 is connected to the phase change tank 1 through the first circulation pipe 41 and the second circulation pipe 42. Figure 1 As shown, when the electric water heater is in the first mode and not discharging water, when the heating element 3 is working, the hot water heated by the heating element 3 in the water tank 2 expands due to heat. The hot water with lower density flows upward and enters the heat exchanger 5 of the phase change tank 1 through the first circulation pipe 41. The water with lower temperature and lower density in the phase change tank 1 returns to the water tank 2 through the second circulation pipe 42. In this way, the water flow circulates between the heat exchanger 5 of the phase change tank 1 and the water tank 2.

[0140] During the aforementioned circulation process, the heat generated by energizing the heating element 3 can raise the water temperature in the water tank 2, and simultaneously raise the water temperature in the heat exchanger 5 of the phase change tank 1. The heat from the water in the heat exchanger 5 can be transferred through its outer shell to the phase change material in contact with it, allowing the phase change material to absorb heat and store energy. To ensure that, during the heat storage phase, the hot water flowing from the water tank 2 into the heat exchanger 5 of the phase change tank 1 can return to the water tank 2 more efficiently along the circulation pipe without additional driving force, at least part of the heat exchanger 5 is arranged from top to bottom along the water flow direction in the height direction Y of the phase change tank 1. If the water flowing from the water tank 2 into the phase change tank 1 flows entirely from bottom to top along the height direction Y, due to the combined effects of internal pipe resistance in the heat exchanger 5, gravity, and a drop in water temperature, the hot water in the water tank 2 may flow upwards for a certain distance before its temperature drops and it stops flowing, making it difficult to return to the water tank 2 without external driving force.

[0141] Of course, in other embodiments of this application, it is not excluded that a driving device, such as a pump 6, may be installed in the circulation pipeline to provide driving force for the water flow in the circulation pipeline. Specifically, in the case where a pump 6 is installed in the circulation pipeline, when the electric water heater is in the first mode, the pump 6 can be activated, thereby providing driving force for the water flow in the circulation pipeline. When the electric water heater is in the second mode, since the circulation pipeline is in a non-connected state, the pump 6 does not activate.

[0142] In one embodiment, the first water inlet 411 is located at the upper part of the water tank 2, the first water outlet 412 is located at the upper part of the phase change tank 1, the second water inlet 421 is located at the lower part of the phase change tank 1, and the second water outlet 422 is located at the lower part of the water tank 2.

[0143] When the first inlet end 411 of the first circulation pipe 41 is located at the upper part of the water tank 2, the water that is preferentially heated at the upper part of the water tank 2 can enter the phase change tank 1 at a faster speed and with a shorter path, thereby achieving heat storage of the phase change material. This allows the phase change material in the phase change tank 1 to complete the heat storage process as soon as possible and shorten the heat storage time. In addition, since the water with a lower temperature flowing out of the phase change tank 1 flows into the lower part of the water tank 2 through the second outlet end 422, this setting can prevent the water with a lower temperature from disturbing the decreasing water temperature of the water tank 2 from top to bottom in the early stage of heat storage. It also helps to ensure that the water with a higher temperature can stably pass through the first circulation pipe 41 into the phase change tank 1 at the upper part, thereby achieving efficient heat storage of the phase change material in the phase change tank 1.

[0144] The first water outlet 412 is located at the upper part of the phase change tank 1, and the second water inlet 421 is located at the lower part of the phase change tank 1. This facilitates the hot water flowing into the phase change tank 1 through the first circulation pipe 41 to flow smoothly inside the heat exchanger 5 under the action of gravity. In other words, even without an external drive, the water flowing out of the water tank 2 can reliably flow through the phase change tank 1 to achieve circulation.

[0145] Of course, in the embodiments of this application, it is not excluded that the positions of the first water inlet 411, the first water outlet 412, the second water inlet 421 and the second water outlet 422 may be changed according to actual design requirements in other embodiments.

[0146] like Figure 14 As shown, in one embodiment, the temperature control valve is installed on the first circulation pipe 41, and the other side of the water supply pipe 81 is directly or through the temperature control valve connected to the first circulation pipe 41. When the electric water heater dispenses water, the water supply in the water supply pipe 81 is diverted through the temperature control valve, with part of the water supply flowing into the heat exchanger 5, the water flowing out of the heat exchanger 5 entering the water tank 2 through the second circulation pipe 42, and the water flowing out of the water tank 2 flowing out through the first circulation pipe 41. The remaining water supply can mix with the water flowing out of the water tank 2. Alternatively, part of the water supply in the water supply pipe 81 flows into the heat exchanger 5, the water flowing out of the heat exchanger 5 enters the water tank 2 through the second circulation pipe 42, the water flowing out of the water tank 2 flows into the temperature control valve through the first circulation pipe 41, and the other part of the water supply in the water supply pipe 81 flows directly into the temperature control valve.

[0147] In this embodiment, the temperature regulating valve can be installed on the first circulation pipeline 41, and the other side of the water supply pipeline 81 can be connected to the first circulation pipeline 41 through the temperature regulating valve; specifically, the other side of the water supply pipeline 81 can be connected to the temperature regulating valve. Alternatively, the other side of the water supply pipeline 81 can be directly connected to the first circulation pipeline 41; specifically, the other side of the water supply pipeline 81 can be connected to the first circulation pipeline 41.

[0148] like Figure 3As shown, taking the thermostatic valve for diversion as an example, the other side of the water supply pipe 81 can be connected to the thermostatic valve. When the electric water heater needs to supply water externally, the external water source is connected to the water supply pipe 81, and the water in the water supply pipe 81 flows into the thermostatic valve. After being diverted by the thermostatic valve, part of the water flows into the heat exchanger 5, and the water flowing out of the heat exchanger 5 enters the water tank 2 through the second circulation pipe 42. The water flowing out of the water tank 2 flows out through the first circulation pipe 41, and the remaining water can mix with the water flowing out of the water tank 2 to form water with a temperature that meets the user's set requirements, which is then supplied to the water terminal.

[0149] It should be noted that the electric water heater may also be equipped with detection devices, such as temperature and flow sensors. The temperature sensors may include multiple sensors, one of which can detect the temperature of the cold water flowing into the water supply pipe 81, another can detect the temperature of the water exiting the water tank 2, and a third can detect the temperature of the mixed water. When the temperature of the mixed water differs from the user-set temperature, the temperature regulating valve can be adjusted to bring the temperature of the mixed water closer to the user-set temperature.

[0150] Furthermore, taking the thermostatic valve used for water distribution as an example, when the electric water heater needs to supply water externally, the external water source is connected to the water supply pipe 81. Part of the water supply in the water supply pipe 81 flows into the heat exchanger 5. The water flowing out of the heat exchanger 5 enters the water tank 2 through the second circulation pipe 42. The water flowing out of the water tank 2 flows into the thermostatic valve through the first circulation pipe 41. The other part of the water supply in the water supply pipe 81 flows directly into the thermostatic valve. The two parts of water mix in the thermostatic valve to form water with a temperature that meets the user's set requirements, which is then supplied to the water terminal.

[0151] Please refer to the following: Figure 3 In one embodiment, the temperature control valve is installed on the second circulation pipe 42. When the electric water heater dispenses water, the water supplied in the water supply pipe 81 is diverted by the temperature control valve. Part of the water flows into the water tank 2, and the water flowing out of the water tank 2 enters the heat exchanger 5 through the first circulation pipe 41. The water flowing out of the heat exchanger 5 flows out through the second circulation pipe 42, and the remaining water can mix with the water flowing out of the heat exchanger 5. Alternatively, part of the water supplied in the water supply pipe 81 flows into the water tank 2, the water flowing out of the water tank 2 enters the heat exchanger 5 through the first circulation pipe 41, the water flowing out of the heat exchanger 5 flows into the temperature control valve through the second circulation pipe 42, and the other part of the water supplied in the water supply pipe 81 flows directly into the temperature control valve.

[0152] In this embodiment, the temperature regulating valve can be installed on the second circulation pipeline 42, and the other side of the water supply pipeline 81 can be directly connected to the second circulation pipeline 42; specifically, the other side of the water supply pipeline 81 can be connected to the second circulation pipeline 42. Alternatively, the other side of the water supply pipeline 81 can be connected to the second circulation pipeline 42 via a temperature regulating valve; specifically, the other side of the water supply pipeline 81 can be connected to the temperature regulating valve.

[0153] Taking the thermostatic valve used for diversion as an example, the other side of the water supply pipe 81 can be connected to the thermostatic valve. For example... Figure 4 As shown, when the electric water heater needs to supply water externally, the external water source is connected to the water supply pipeline 81. After the water supply in the water supply pipeline 81 is diverted by the temperature regulating valve, part of the water supply flows into the water tank 2. The water flowing out of the water tank 2 enters the heat exchanger 5 through the first circulation pipeline 41. The water flowing out of the heat exchanger 5 flows out through the second circulation pipeline 42. The other part of the water supply can mix with the water flowing out of the heat exchanger 5 to form water with a temperature that meets the user's set requirements, which is then supplied to the water terminal.

[0154] Taking the thermostatic valve used for water supply as an example, when the electric water heater needs to supply water externally, the external water source is connected to the water supply pipe 81. Part of the water supply in the water supply pipe 81 flows into the water tank 2. The water flowing out of the water tank 2 enters the heat exchanger 5 through the first circulation pipe 41. The water flowing out of the heat exchanger 5 flows into the thermostatic valve through the second circulation pipe 42. The other part of the water supply in the water supply pipe 81 flows directly into the thermostatic valve. The two parts of water mix in the thermostatic valve to form water with a temperature that meets the user's set requirements, which is then supplied to the water terminal.

[0155] In this embodiment, the temperature control valve can be an integrated electric temperature control valve, or it can be a combination of multiple valves, etc. The specific form of the temperature control valve is not limited to the above description. Those skilled in the art may make other modifications based on the technical essence of this application, but as long as the function and effect achieved are the same as or similar to those of this application, they should be covered within the protection scope of this application. In the embodiments of this application, the temperature control valve is mainly used as an example for illustration.

[0156] In one embodiment, the temperature control valve includes at least a first interface 91, a second interface 92, and a third interface 93. The first interface 91 is used to connect to the other side of the water supply pipe 81. The second interface 92 and the third interface 93 are both connected to the first circulation pipe 41. When the electric water heater is in the first mode and no water is being dispensed, the water in the water tank 2 can circulate between the water tank 2 and the heat exchanger 5. Along the water flow direction, the third interface 93 and the second interface 92 are sequentially connected. When the electric water heater is in the second mode and no water is being dispensed, the third interface 93 and the second interface 92 are not connected, and the water in the water tank 2 does not circulate between the water tank 2 and the heat exchanger 5.

[0157] In this embodiment, the temperature control valve may include multiple interfaces. Specifically, the number of interfaces of the temperature control valve can be adaptively increased or decreased according to the actual water circuit connection needs. For example, the temperature control valve may include a first interface 91, a second interface 92, and a third interface 93. Taking the temperature control valve for diversion as an example, the first interface 91 can be connected to the other side of the water supply pipe 81, and the first interface 91 can be used as the water inlet of the temperature control valve; the second interface 92 and the third interface 93 can be connected to the circulation pipe, and can realize different functions when the electric water heater is in different states.

[0158] Specifically, when the electric water heater is in the first mode and no water is being dispensed, such as... Figure 1 As shown, along the water flow direction, the third interface 93 and the second interface 92 are sequentially connected, and the water in the water tank 2 can circulate between the water tank 2 and the heat exchanger 5.

[0159] When the electric water heater is in the second mode and no water is being dispensed, such as Figure 2 As shown, the third interface 93 is not connected to the second interface 92, and the water in the water tank 2 does not circulate between the water tank 2 and the heat exchanger 5.

[0160] In either the first or second mode, when the electric water heater dispenses water, the first interface 91 can be connected to the second interface 92 and the third interface 93. The water flowing out of the first interface 91 is diverted to the second interface 92 and the third interface 93. The water entering the third interface 93 can be used to flow into the water tank 2 or the phase change tank 1, and the water entering the second interface 92 can be used as cold water for mixing.

[0161] In one embodiment, when the electric water heater is in the first mode and not discharging water, the first interface 91 is structurally connected to the second interface 92 and / or the third interface 93 along the water flow direction, but not connected in the water path.

[0162] In this embodiment, when the electric water heater is in the first mode and not dispensing water, the circulation pipe is connected through the third interface 93 and the second interface 92. The water heated by the heating element 3 in the water tank 2 can flow into the phase change tank 1 through the first circulation pipe 41. After storing heat in the phase change material in the phase change tank 1, it can flow into the water tank 2 through the second circulation pipe 42. During the start-up process of the heating element 3, the water tank 2 and the phase change tank 1 are connected through the circulation pipe, forming a relatively closed pressure vessel. When the first interface 91 is structurally connected to at least one of the second interface 92 and the third interface 93, if the pressure in the closed pressure vessel formed by the circulation pipe of the water tank 2 and the phase change tank 1 is too high, the pressure can be released through the connection structure formed by the first interface 91 and the second interface 92 and / or the third interface 93. That is, the pressure can be released outward through the second interface 92 and / or the third interface 93 and the first interface 91, thereby ensuring the safety of the electric water heater during use.

[0163] The electric water heater is also equipped with a pressure relief valve. The first port 91 of the temperature control valve can be connected to the pressure relief valve. When pressure relief is required, the pressure in the pressure-bearing container formed by the water tank 2 and the phase change tank 1 connected by the circulation pipeline can be released through the pressure relief valve after passing through the temperature control valve.

[0164] Furthermore, when the electric water heater is in the first mode and does not dispense water, the first interface 91 is structurally connected to the second interface 92 and / or the third interface 93, but not connected in the water circuit. When the electric water heater switches from dispensing water to dispensing water, the time that the first interface 91 is structurally connected to the second interface 92 and / or the third interface 93 can be reduced, the adjustment speed is faster, and thus the user's waiting time for water can be reduced.

[0165] The fact that the first interface 91 is not connected to the second interface 92 and / or the third interface 93 in the water circuit mainly means that when the electric water heater is in the first mode and no water is being dispensed, there is no water flow from the first interface 91 to the second interface 92 and / or no water flow from the first interface 91 to the third interface 93.

[0166] In one specific embodiment, the temperature regulating valve includes a valve body 90 and a valve core disposed within the valve body 90. The first interface 91, the second interface 92, and the third interface 93 are all disposed on the valve body 90. When the electric water heater is in the water outlet state, the first interface 91 can communicate with the second interface 92 and the third interface 93. When the electric water heater is in the first mode and is not discharging water, the valve core controls the opening degree of the second interface 92 and the third interface 93 to be equal. When the water heater switches from discharging water to discharging water, the valve core can adjust the opening degree of the second interface 92 and the third interface 93.

[0167] In this embodiment, taking the valve body 90 as an example, which is provided with a first interface 91, a second interface 92, and a third interface 93, the first interface 91 is always connected to the second interface 92 and the third interface 93. Thus, when the electric water heater is in the first state, pressure relief channels can be formed between the second interface 92 and the third interface 93 and the first interface 91. When the internal pressure of the water tank 2 / heat exchanger 5 is too high, pressure can be released to the outside through these pressure relief channels.

[0168] Furthermore, when the electric water heater is in the first mode and no water is being dispensed, the openings of the second interface 92 and the third interface 93 can be equal. This setting minimizes the flow resistance of the water flow channel formed between the second interface 92 and the third interface 93 and maximizes the flow rate. This helps ensure that the hot water in the water tank 2 can flow efficiently between the water tank 2 and the heat exchanger 5 through the circulation pipe, thereby improving the heat storage efficiency.

[0169] Furthermore, when the electric water heater is in the first mode and not dispensing water, the valve core controls the opening of the second interface 92 and the third interface 93 to be equal. When the water heater switches from dispensing water to dispensing water, the valve core adjusts the opening of the second interface 92 and the third interface 93 with the opening of the second interface 92 and the third interface 93 being equal as the initial adjustment position. The temperature control valve can respond quickly, and the valve core only needs to make a small adjustment (e.g., rotate a small angle) to efficiently output water to the water terminal that meets the user's set temperature requirements.

[0170] It should be further explained that when the electric water heater is dispensing water, the flow control valve can dynamically change according to the change in the amount of hot water dispensed by the water heater. As the user's water consumption increases, for example, when the hot water output of the water heater reaches a certain level, the water temperature flowing out of the water tank 2 or heat exchanger 5 approaches the user's set outlet temperature. At this time, it is no longer necessary to dispense some cold water for mixing. Accordingly, all the water supplied by the water heater can be supplied to the heat exchanger 5 or water tank 2 through the temperature control valve. Specifically, at this time, the first interface 91 can be connected only to the second interface 92.

[0171] Alternatively, under certain special operating conditions, such as when the ambient temperature is high, the water supply temperature is high, and the user-set outlet water temperature is close to the water supply temperature, the water supplied by the water supply pipe 81 can be output to the water terminal through the temperature regulating valve. In this case, the first interface 91 can be connected only to the third interface 93.

[0172] In this embodiment, the electric water heater may further include a water outlet pipe 82, one end of which is connected to the circulation pipe or the temperature control valve, and the other end of which is connected to a water terminal. When the electric water heater dispenses water, the water flowing from the circulation pipe or the temperature control valve flows to the water terminal through the water outlet pipe 82.

[0173] In this embodiment, one end of the outlet pipe 82 is connected to the circulation pipe or to the temperature control valve. The outlet pipe is entirely located outside the water tank 2. This design eliminates the need for a separate opening in the water tank 2 for installing the outlet pipe 82, thereby improving the reliability of the water tank 2 during use, reducing the risk of leakage, and lowering manufacturing costs. Furthermore, connecting one end of the outlet pipe 82 to the circulation pipe or the temperature control valve facilitates the integration and multi-functional design of the circulation pipe. When the electric water heater supplies water externally, this part of the circulation pipe can also function as the outlet pipe 82 to output water from the water tank 2 / phase change tank 1.

[0174] In one embodiment, when the electric water heater is in the first state, along the water flow direction, the third interface 93 is located upstream of the second interface 92, and the water in the circulation pipe flows from the third interface 93 to the second interface 92; the temperature regulating valve is used for diversion, and when the electric water heater is in the water outlet state, the first interface 91 is connected to the second interface 92 and the third interface 93, and the water flowing in from the first interface 91 is diverted to the second interface 92 and the third interface 93.

[0175] In this embodiment, taking the thermostatic valve including a first interface 91, a second interface 92, and a third interface 93 as an example, when the electric water heater is in the first state, the third interface 93 and the second interface 92 cooperate to open the circulation pipe. The third interface 93 can be located upstream of the second interface 92. When water flows in the circulation pipe, taking the thermostatic valve located in the first circulation pipe 41 as an example, the hot water in the water tank 2 flows into the first circulation pipe 41 through the first inlet 411. While flowing through the first circulation pipe 41, it sequentially flows through the third interface 93 and the second interface 92, and then flows into the phase change tank 1 through the first outlet 412. Subsequently, the water in the phase change tank 1 returns to the water tank 2 through the second circulation pipe 42.

[0176] like Figure 3As shown, taking the thermostatic valve for diversion as an example, when the electric water heater dispenses water, the water supplied by the external water source flows into the first port 91 of the thermostatic valve through the water supply pipe 81, and then is diverted by the thermostatic valve. Part of the water supply is diverted to the second port 92 to displace the hot water in the electric water heater, and part of the water supply is diverted to the third port 93 to mix with the displaced hot water to obtain mixed water with a temperature that meets the user's set requirements. This mixed water is then supplied to the water terminal through the water outlet pipe 82.

[0177] like Figure 4 As shown, in one specific embodiment, the temperature control valve further includes a fourth interface 94, which is used to connect to the water outlet pipe 82. When the electric water heater is in the water outlet position, the water supply in the water supply pipe 81 can be diverted by the temperature control valve. Part of the water supply flows into the heat exchanger 5 and / or the water tank 2, while the other part of the water supply mixes with the water flowing out of the heat exchanger 5 and / or the water tank 2 in the temperature control valve and flows to the water outlet pipe 82 through the fourth interface 94.

[0178] In this embodiment, the temperature control valve may further include a fourth interface 94, and one end of the water outlet pipe 82 is connected to the fourth interface 94. When the temperature control valve is integrated with the fourth interface 94, one end of the water outlet pipe 82 can be conveniently installed on the temperature control valve through a detachable connection, thereby improving the integration of the water circuit and simplifying the pipe connection.

[0179] In this process, the additional water supply (cold water) can be mixed with the water (hot water) flowing out from the heat exchanger 5 and / or the water tank 2 in the temperature control valve, and then flow to the water outlet pipe 82 through the fourth interface 94. This enables real-time adjustment of the ratio of cold and hot water during the mixing process, reducing water temperature fluctuations caused by water pressure fluctuations, such as when other water terminals are turned on at the same time.

[0180] In some embodiments of this application, the phase change tank 1 may be located above the water tank 2 or the phase change tank 1 may be arranged to the left and right of the water tank 2, and the hot water in the water tank 2 may circulate naturally between the water tank 2 and the phase change tank 1 through the circulation pipe.

[0181] In this embodiment, the phase change tank 1 and the water tank 2 are connected through a circulation pipeline. During the start-up of the heating element 3, no additional power source is required, allowing for natural circulation of water within the pipeline. This simplifies the system, reduces energy consumption, effectively controls overall costs, and eliminates noise disturbance to the user. Of course, in other embodiments, it is not excluded that the phase change tank 1 and the water tank 2 may be arranged side-by-side, or that the phase change tank 1 may be positioned below the water tank 2.

[0182] In some embodiments, the heat exchanger 5 and the water tank 2 can be connected in parallel to supply water through the circulation pipeline. When the electric water heater supplies water, a portion of the water supply in the water supply pipeline 81 can flow directly or through the temperature regulating valve into the heat exchanger 5 and / or the water tank 2.

[0183] In this embodiment, the heat exchanger 5 and the water tank 2 can be connected in parallel via a circulation pipeline. Specifically, when the electric water heater dispenses water, the temperature control valve can divert the water supply flowing into the water supply pipeline 81. At this time, part of the water supply in the water supply pipeline 81 can first flow into the temperature control valve, and after being diverted by the temperature control valve, part of it flows into the heat exchanger 5 and the water tank 2, while the remaining part of the water supply can be used as cold water for mixing, thereby adjusting the outlet water temperature. Alternatively, the temperature control valve can divert the water supply in the water supply pipeline 81, supplying part to the heat exchanger 5 and part to the water tank 2.

[0184] Alternatively, when the electric water heater is dispensing water, if the temperature control valve is used to combine the water flow, the water supply pipe 81 can be connected to the circulation pipe for diversion. A portion of the water flowing into the water supply pipe 81 can directly flow into the heat exchanger 5 and the water tank 2, respectively. The hot water flowing out of the water tank 2 and the heat exchanger 5 can flow into the temperature control valve. The remaining portion, used for mixing, can also flow into the temperature control valve. Hot and cold water can be mixed in this temperature control device to adjust the outlet water temperature. Alternatively, when no portion of the water supply is diverted for mixing, the water flowing into the water supply pipe 81 can directly flow into the heat exchanger 5 and the water tank 2, respectively. The hot water flowing out of the water tank 2 and the heat exchanger 5 can flow into the temperature control valve for mixing to adjust the outlet water temperature.

[0185] The circulation pipeline includes a first circulation pipeline 41 and a second circulation pipeline 42. The first circulation pipeline 41 has a first water inlet 411 and a first water outlet 412. The first water inlet 411 is located in the water tank 2, and the first water outlet 412 is located in the phase change tank 1. The second circulation pipeline 42 has a second water inlet 421 and a second water outlet 422. The second water inlet 421 is located in the phase change tank 1, and the second water outlet 422 is located in the water tank 2. The temperature regulating valve is installed on the first circulation pipeline 41 or the second circulation pipeline 42.

[0186] Furthermore, the first water inlet 411 is located at the upper part of the water tank 2, the first water outlet 412 is located at the upper part of the phase change tank 1, the second water inlet 421 is located at the lower part of the phase change tank 1, and the second water outlet 422 is located at the lower part of the water tank 2.

[0187] The specific configuration of the above-mentioned circulation pipeline and the resulting technical effects can be referred to the description of the series implementation method above, and will not be elaborated here.

[0188] In some embodiments, the temperature control valve is installed on the second circulation pipe 42, and the other side of the water supply pipe 81 is directly or through the temperature control valve connected to the second circulation pipe 42. When the electric water heater is discharging water, and the other side of the water supply pipe 81 is connected to the second circulation pipe 42 through the temperature control valve, the water supplied in the water supply pipe 81 is diverted by the temperature control valve, and part of the water flows into the heat exchanger 5 and the water tank 2 through the second circulation pipe 42. The water flowing out of the heat exchanger 5 and the water tank 2 then flows out through the first circulation pipe 41, and the remaining water can mix with the water flowing out of the heat exchanger 5 and the water tank 2. Alternatively, when the electric water heater is discharging water, and the other side of the water supply pipe 81 is directly connected to the second circulation pipe 42, a portion of the water supplied in the water supply pipe 81 flows into the heat exchanger 5 and the water tank 2 through the second circulation pipe 42, and the remaining water can mix with the water flowing out of the heat exchanger 5 and the water tank 2. Water flowing out of the heat exchanger 5 and the water tank 2 flows into the temperature control valve through the first circulation pipe 41, and another part of the water supply in the water supply pipe 81 flows directly into the temperature control valve; or, when the electric water heater dispenses water, and the other side of the water supply pipe 81 is connected to the second circulation pipe 42 through the temperature control valve, the water supply in the water supply pipe 81 is diverted through the temperature control valve and flows into the heat exchanger 5 and the water tank 2 through the second circulation pipe 42, and the water flowing out of the heat exchanger 5 and the water tank 2 mixes after flowing out of the first circulation pipe 41; or, when the electric water heater dispenses water, and the other side of the water supply pipe 81 is directly connected to the second circulation pipe 42, the water supply in the water supply pipe 81 flows into the heat exchanger 5 and the water tank 2 through the second circulation pipe 42, and the water flowing out of the heat exchanger 5 and the water tank 2 enters the temperature control valve through the first circulation pipe 41 and mixes.

[0189] In this embodiment, the main difference between the parallel water outlet embodiment and the series water outlet embodiment described above is that when the electric water heater outlets water, the water tank 2 and the phase change tank 1 in the water circuit are in a parallel state. The control principles of the two in other water circuit connections are similar. This parallel water outlet embodiment can be adapted to refer to the series water outlet embodiment described above.

[0190] The following will provide examples with reference to the accompanying drawings and embodiments.

[0191] Please refer to the following: Figure 15In one embodiment, when a portion of the water supplied in the water supply pipe 81 flows into the heat exchanger 5 and the water tank 2, and another portion of the water supplied in the water supply pipe 81 is used to mix with the water flowing out of the heat exchanger 5 and the water tank 2, the temperature regulating valve includes at least a first interface 91, a second interface 92, a third interface 93, and a sixth interface 96. The second interface 92 and the third interface 93 are connected to the second circulation pipe 42. When the electric water heater is in a first state, along the water flow direction, the third interface 93 and the second interface 92 are sequentially connected, and the water in the water tank 2 can circulate between the water tank 2 and the heat exchanger 5. When the electric water heater outputs water, the first interface 91 can be connected to the second interface 92 and the third interface 93, and the first interface 91 can be connected to the sixth interface 96.

[0192] Please refer to the following: Figure 16 In one embodiment, when the water supply in the water supply pipe 81 flows only into the heat exchanger 5 and the water tank 2, the temperature control valve includes at least a first interface 91, a second interface 92, and a third interface 93, the second interface 92 and the third interface 93 being connected to the second circulation pipe 42; when the electric water heater is in the first state, along the water flow direction, the third interface 93 and the second interface 92 are sequentially connected, and the water in the water tank 2 can circulate between the water tank 2 and the heat exchanger 5; when the electric water heater outlets water, the first interface 91 can be connected to the second interface 92 and the third interface 93.

[0193] In this fifth embodiment, the main difference from the above embodiments is that the water supplied by the water supply pipeline 81 does not need to be separated into a separate line for mixing water.

[0194] like Figure 17As shown, in some embodiments, the temperature control valve is installed on the first circulation pipe 41, and the other side of the water supply pipe 81 is directly or through the temperature control valve connected to the first circulation pipe 41; when the electric water heater dispenses water, when the other side of the water supply pipe 81 is connected to the first circulation pipe 41 through the temperature control valve, the water supplied in the water supply pipe 81 is diverted by the temperature control valve, and part of the water flows into the heat exchanger 5 and the water tank 2 through the first circulation pipe 41, and the water flowing out of the heat exchanger 5 and the water tank 2 flows out through the second circulation pipe 42, while the remaining water can mix with the water flowing out of the heat exchanger 5 and the water tank 2; or, when the electric water heater dispenses water, when the other side of the water supply pipe 81 is directly connected to the first circulation pipe 41, a portion of the water supplied in the water supply pipe 81 flows into the heat exchanger 5 and the water tank 2 through the first circulation pipe 41, and the remaining water can mix with the water flowing out of the heat exchanger 5 and the water tank 2; Water flowing out of the heat exchanger 5 and the water tank 2 flows into the temperature control valve through the second circulation pipe 42, and another part of the water supply in the water supply pipe 81 flows directly into the temperature control valve; or, when the electric water heater dispenses water, when the other side of the water supply pipe 81 is connected to the first circulation pipe 41 through the temperature control valve, the water supply in the water supply pipe 81 is diverted through the temperature control valve and flows into the heat exchanger 5 and the water tank 2 through the first circulation pipe 41, and the water flowing out of the heat exchanger 5 and the water tank 2 mixes after flowing out through the second circulation pipe 42; or, when the electric water heater dispenses water, when the other side of the water supply pipe 81 is directly connected to the first circulation pipe 41, the water supply in the water supply pipe 81 flows into the heat exchanger 5 and the water tank 2 through the first circulation pipe 41, and the water flowing out of the heat exchanger 5 and the water tank 2 enters the temperature control valve through the second circulation pipe 42 to mix.

[0195] The main difference between the above-described parallel water outlet implementation method and the above-described implementation method is that the temperature control valve is located in a different position. In this implementation method, the temperature control valve is located in the first circulation pipeline 41. The corresponding technical effects can be referred to the specific description of the above-described implementation method, and will not be elaborated further here.

[0196] Among them, such as Figure 17As shown, when the electric water heater supplies water, the temperature control valve is used for confluence. When a portion of the water supplied in the water supply pipe 81 flows into the heat exchanger 5 and the water tank 2, and another portion of the water supplied in the water supply pipe 81 is used to mix with the water flowing out of the heat exchanger 5 and the water tank 2, the temperature control valve includes at least a first interface 91, a second interface 92, a third interface 93, and a sixth interface 96. The second interface 92 and the third interface 93 are connected to the first circulation pipe 41. When the temperature control valve is in the first state, along the water flow direction, the third interface 93 and the second interface 92 are sequentially connected, and the water in the water tank 2 can circulate between the water tank 2 and the heat exchanger 5. When the electric water heater supplies water, the first interface 91 is connected to the second interface 92 and the third interface 93, and the sixth interface 96 can be connected to the first interface 91.

[0197] Please refer to the following: Figure 4 , Figure 5 , Figure 6 In some embodiments, a heating element 3 is provided in the middle or lower part of the water tank 2; the phase change tank 1 is located above the water tank 2; the temperature control valve is detachably installed on the phase change tank 1; the circulation pipeline includes a first circulation pipeline 41 and a second circulation pipeline 42, one end of the first circulation pipeline 41 is connected to the water tank 2, and the other end is connected to the heat exchanger 5 through the temperature control valve; one end of the second circulation pipeline 42 is connected to the heat exchanger 5, and the other end is connected to the water tank 2. The electric water heater also includes a water supply pipe 81 and a water outlet pipe 82. One end of the water supply pipe 81 can be connected to a water source, and the other end is connected to the temperature control valve. One end of the water outlet pipe 82 is connected to the temperature control valve, and the other end is used to connect to a water terminal. The temperature control valve, the circulation pipe, the water supply pipe 81, and the water outlet pipe 82 are combined to form a water circuit assembly. The electric water heater also includes a housing 7, and the water tank 2, the phase change tank 1, and at least part of the water circuit assembly are disposed in the housing 7.

[0198] In this embodiment, the specific composition and functions of the water tank 2, phase change tank 1, temperature control valve, circulation pipeline, water supply pipeline 81 and water outlet pipeline 82 can be referred to the specific description of the above embodiment, and will not be repeated here.

[0199] In this embodiment, the temperature control valve is detachably mounted on the phase change tank 1. When the temperature control valve is detachably mounted on the phase change tank 1, it firstly improves the ease of installation and maintenance; secondly, it eliminates the need for a section of the circulation pipe connecting the phase change tank 1 and the temperature control valve, facilitating installation within limited space; it also shortens the water path between the temperature control valve and the phase change tank 1, reducing water resistance and ensuring reliable water flow during the heat storage phase; furthermore, different application scenarios have different performance requirements for electric water heaters, such as temperature adjustment range and response speed. When the temperature control valve is directly detachably mounted on the phase change tank 1, it can be replaced to adapt the electric water heater to different operating conditions without modifying other structures. Alternatively, when the temperature control valve is subsequently upgraded, it can be easily disassembled to upgrade the electric water heater.

[0200] When a heating element 3 is installed in the water tank 2, the heating element 3 can be located in the middle or lower part of the water tank 2. Taking the heating element 3 as a heating rod as an example, the number of heating rods can be one, two, or more. Among them, at least one heating rod is located at the bottom of the water tank 2.

[0201] When a heating element 3 is installed in the middle or lower part of the water tank 2, the temperature of the water in the entire tank can be raised to a higher temperature before circulation or water discharge. Especially for scenarios where the water tank 2 itself has a small volume, when the heating element 3 is installed at the bottom of the water tank 2, it can ensure that there is enough heat in the water tank 2 to provide to the phase change material during heat storage; and that there is enough hot water to provide to the user when using water.

[0202] The electric water heater also includes a housing 7, inside which the phase change tank 1 and the water tank 2 are installed.

[0203] Both the phase change tank 1 and the water tank 2 can extend along the horizontal direction X. The length of the phase change tank 1 is shorter than the length of the water tank 2. One end of the phase change tank 1 forms an installation space between the water tank 2 and the end cap of the outer casing 7 to accommodate the water circuit assembly.

[0204] At least some of the water circuit components can be installed using the aforementioned installation space. Specifically, the temperature control valve, as well as parts of the circulation pipe, inlet pipe, and outlet pipe, can be located within this installation space. Furthermore, the circuit board of the electric water heater can also be located within this installation space. By effectively utilizing the aforementioned installation space, the components can be rationally and compactly installed without increasing the volume of the outer casing 7, through efficient use of its internal space.

[0205] In one embodiment, the housing 7 has opposing front and rear sides, the water circuit assembly is disposed near the rear side of the housing 7, and the electric water heater also includes a circuit board disposed near the front side of the housing 7. Furthermore, the temperature control valve is disposed above the rear side of the housing 7, and the inlet of the water supply pipe and the outlet of the water outlet pipe are disposed below the rear side of the housing 7.

[0206] In this embodiment, an electric water heater is typically equipped with a computer board, which can be used to store the control program of the electric water heater and to be electrically connected to control components, such as temperature control valves, to control the normal operation of the electric water heater and realize various functions.

[0207] The outer casing 7 has a front side facing the user and a rear side relatively far from the user. The water circuit assembly and the computer board can be set in separate sections, so as to achieve water and electricity separation in space and prevent the computer board from being negatively affected by the failure of the water circuit assembly, such as leakage, and thus affecting the normal use of the computer board.

[0208] When the water circuit component and the computer board are arranged in separate sections, specifically, the water circuit component can be placed near the front of the housing 7, and the computer board can be placed near the rear of the housing 7; alternatively, the computer board can be placed near the front of the housing 7, and the water circuit component near the rear of the housing 7. Typically, the panel of the housing 7 has some control components and display components, etc. When the computer board is placed near the front of the housing 7, it helps to shorten the connection lines between the computer board and these components, and at the same time, the computer board will not intersect with the water circuit component, improving the reliability of the computer board during use. In the following embodiments, the description will be based on the premise that the computer board is placed near the front of the housing 7 and the water circuit component is placed near the rear of the housing 7.

[0209] Since the temperature control valve is detachably connected to the phase change tank 1, its height corresponds to that of the phase change tank 1. Specifically, the temperature control valve can be located on the upper part near the rear side of the housing 7, and the inlet and outlet of the water supply pipe are designed to extend downwards out of the housing 7, and can be positioned near the lower rear side of the housing 7. When the inlet and outlet of the water supply pipe are positioned near the lower rear side of the housing 7, an opening for the water supply and outlet pipes to pass through can be correspondingly provided at the bottom of the housing 7. During installation, the water supply and outlet pipes can pass through the opening at the bottom of the housing 7, which facilitates subsequent installation by connecting the water supply and outlet pipes to external pipes and minimizes spatial interference during installation.

[0210] Furthermore, the computer board is positioned above the front side of the outer casing 7. Since the installation space formed between the phase change tank 1, the water tank 2, and the outer casing 7 is located above, the computer board can be positioned above the front side of the outer casing 7. When the computer board is installed at a relatively high position, the negative interference caused to the computer board in the event of malfunctions such as water leakage inside the electric water heater can be minimized.

[0211] In one embodiment, the temperature control valve includes a valve body 90, a valve core disposed within the valve body 90, and a motor for driving the valve core to move. The valve body 90 includes a first interface 91, a second interface 92, a third interface 93, and a fourth interface 94. The first interface 91 is used to connect to the water supply pipe, the second interface 92 is used to seal and connect to the phase change tank 1, the third interface 93 is connected to the other end of the first circulation pipe, and the fourth interface 94 is connected to the water outlet pipe.

[0212] In this embodiment, the temperature regulating valve is specifically an electric temperature regulating valve, which mainly includes: a valve body 90, a valve core, and a motor. The valve body 90 may be provided with multiple interfaces for connecting to water circuits. For example, the valve body 90 may be provided with a first interface 91 for connecting to a water supply pipe, a second interface 92 for sealing connection to the phase change tank 1, a third interface 93 for connecting to a first circulation pipe, and a fourth interface 94 for connecting to an outlet pipe.

[0213] In order to ensure the reliability of the motor during use and to prevent water inside the valve body 90 from flowing into the motor, the motor can be located on top of the valve body 90.

[0214] The end face of the phase change chamber 1 is directly opposite the end cap of the outer casing 7. The temperature control valve can be located between the end face of the phase change chamber 1 and the end cap of the outer casing 7 in the horizontal direction X. Except for the second interface 92 used for sealing connection to the phase change chamber 1, the other interfaces, including the first interface 91, the third interface 93, and the fourth interface 94, all face the end cap of the outer casing 7. This arrangement facilitates the connection of the first interface 91, the third interface 93, and the fourth interface 94 to their corresponding pipes, and also facilitates the reasonable arrangement of the pipes connected to each interface within the aforementioned installation space.

[0215] In one embodiment, the second interface 92 and the third interface 93 are positioned closer to the valve core than the first interface 91 and the second interface 92.

[0216] In this embodiment, when the electric water heater is in a heat storage state, the third interface 93 and the second interface 92 are sequentially connected along the water flow direction. The hot water heated by the heating element 3 in the water tank 2 flows from the third interface 93 to the second interface 92 through the first circulation pipe, and then flows into the heat exchanger 5. The water in the heat exchanger 5 returns to the water tank 2 through the second circulation pipe. When the hot water flows through the temperature regulating valve, since the valve core is positioned higher than the second interface 92 and the third interface 93, when the second interface 92 and the third interface 93 are positioned close to the valve core, the flow path of the water in the valve body 90 can be shortened, the bending structure in the flow path can be minimized, the pipe resistance can be reduced, and the reliable operation of the self-heating convection circulation between the water tank 2 and the heat exchanger 5 can be ensured.

[0217] In one embodiment, at least one of the water supply pipe, the water outlet pipe, and the circulation pipe is a flexible connecting pipe.

[0218] In this embodiment, at least one of the water supply pipe, water outlet pipe, and circulation pipe can be a flexible connecting pipe. This gives the pipe better self-adjustment during assembly, which is beneficial for arranging the pipes in a limited space. During installation, the flexible pipe can be bent as needed to avoid interference with surrounding components and ensure accurate positioning at the connection / installation location. For example, when the water tank 2 and the phase change tank 1 are relatively fixed, installation errors may occur, causing the installation interfaces on the water tank 2 and the phase change tank 1 to differ depending on the installation conditions. When a flexible connecting pipe is used, its adaptability is better, and it can overcome the installation difficulties caused by the aforementioned installation errors.

[0219] When in use, the flexible connecting pipe can release the stress generated by thermal expansion and contraction through its own elastic deformation (expansion, contraction, bending), avoiding stress concentration at the interface or weak parts of the pipe, thereby extending the service life of the pipe and seals.

[0220] In addition, the flexible connecting tube is easy to disassemble and can be quickly separated without complicated tools. Furthermore, there is no need to recalibrate the tube routing when adjusting or replacing it, which significantly shortens maintenance time and reduces after-sales costs.

[0221] Overall, when flexible connecting pipes are used in the pipes of this electric water heater, the problems of layout and assembly tolerance in narrow spaces can be solved. In addition, the product performance can be optimized from multiple dimensions such as operational stability, lifespan, and ease of maintenance, taking into account both practicality and reliability.

[0222] Specifically, the flexible connecting pipe may include a PPR pipe and / or a metal corrugated pipe.

[0223] When the flexible connecting pipe includes PPR pipe (random copolymer polypropylene pipe), it has the following advantages: PPR pipe has high pressure resistance and can withstand high water pressure; it is hygienic and non-toxic, using food-grade raw materials, free of harmful chemicals, and meets drinking water hygiene standards, ensuring water safety and preventing harm to human health; it has good corrosion resistance and is not corroded by acids, alkalis, salts, or other chemicals. Furthermore, PPR pipe has strong anti-aging properties and a service life of over 50 years. The hot-melt connection method fuses the joint and pipe together, resulting in high connection strength and no risk of leakage. This connection method is not only convenient to construct but also ensures the safety and reliability of the piping system; it has a low thermal conductivity and good insulation performance. Using PPR pipe in hot and cold water piping systems can effectively reduce heat loss and save energy.

[0224] When the flexible connecting pipe includes a metal bellows, it has the following advantages:

[0225] With ultra-high flexibility and spatial adaptability: Metal corrugated pipes (especially stainless steel corrugated pipes) adopt a spiral corrugated structure, which can achieve multi-angle bending and small radius folding. They can flexibly navigate in extremely narrow spaces and easily avoid obstacles, making them especially suitable for installation space-constrained scenarios.

[0226] High temperature and high pressure resistance: The stainless steel material can withstand temperatures above 120℃ (far exceeding the water temperature of the water heater) and high water pressure. Even when the water heater is under high pressure, it will not bulge or crack due to pressure fluctuations. It has good structural strength and high safety.

[0227] Excellent impact resistance and aging resistance: The outer layer of the metal corrugated pipe is made of stainless steel, which has strong impact and compression resistance and can withstand minor bumps during installation or external friction during later use; and the metal material is not easily affected by ultraviolet rays and humidity, has excellent aging resistance, and a long service life. It is suitable as a connecting pipe for key nodes such as water heater interfaces and valves (which need to withstand frequent disassembly or vibration).

[0228] Flexible and highly compatible connection methods: The two ends of the metal corrugated pipe are mostly threaded (with rubber sealing rings), which can be directly adapted to the threaded ports of water heater interfaces, angle valves and other accessories. No special tools are required for installation / disassembly, which facilitates later maintenance (such as replacing water heaters and cleaning pipes); and the metal material is highly compatible with various valves and pipe fittings.

[0229] Furthermore, in some embodiments, PPR pipes and corrugated metal pipes can be used in combination in electric water heaters to combine the advantages of both and achieve synergistic effects. Of course, the specific form of the flexible connecting pipe can also be other types, and is not limited to the above description. Those skilled in the art, inspired by the technical essence of this application, may make other modifications, but as long as the functions and effects achieved are the same as or similar to those of this application, they should all be covered within the scope of protection of this application.

[0230] In one embodiment, the connector of the flexible connecting tube is a metal part or a metal insert disposed on a plastic material.

[0231] In this embodiment, considering that the main material of the flexible connecting pipe (such as PPR pipe) has low strength, if the force is concentrated during installation, it is easy to cause deformation and other phenomena, resulting in loosening of the connection.

[0232] To ensure the strength and reliability of the connection structure at the joint location, the joint can be made of metal or a metal insert can be provided.

[0233] Specifically, when the connector is made of metal, the high strength of the metal (such as copper or stainless steel) can directly withstand the tightening force during installation and the water pressure impact during long-term use, ensuring that the connector connection is always firm and avoiding connection failure due to insufficient material strength.

[0234] When a connector is made of plastic with a metal insert, the metal insert (such as a pre-embedded metal threaded sleeve) can transfer the stress concentration area to the metal component, while the plastic body only plays an auxiliary fixing role. This retains the lightweight advantage of plastic material and strengthens the key stress points through the metal insert, preventing the connector from being damaged under repeated disassembly or long-term stress.

[0235] In addition, when the joint of the flexible connecting pipe is a metal part or a metal insert set on plastic material, it can enhance the sealing of the connection position, reduce the risk of leakage, and improve the temperature resistance and aging resistance, so as to better ensure the long-term stable operation of the joint.

[0236] In one embodiment, the end of the phase change tank 1 is provided with a flow channel 10 for connecting the temperature control valve and the heat exchanger 5, and the flow channel 10 is used as part of the circulation pipe.

[0237] In this embodiment, the temperature control valve has a second interface 92, which is used for a sealed connection to the phase change chamber 1.

[0238] To ensure that the water flowing into the heat exchanger 5 can flow smoothly from top to bottom and finally flow out through the outlet of the heat exchanger 5 located at the bottom of the phase change tank 1, the inlet of the heat exchanger 5 is located at the top of the phase change tank 1.

[0239] For the temperature control valve, considering that components such as a motor are installed above the second port 92, if the second port 92 of the temperature control valve is directly inserted into the water inlet of the heat exchanger 5, the temperature control valve would exceed the highest position of the phase change tank 1 in the height direction Y, thus increasing the size of the entire outer casing 7. In order to ensure that the temperature control valve does not exceed the highest position of the phase change tank 1 in the height direction Y, the second port 92 is installed on the phase change tank 1 at a position lower than the water inlet of the heat exchanger 5.

[0240] To connect the second interface 92 to the inlet of the heat exchanger 5, in this embodiment, a drainage channel 10 is provided at the end of the phase change tank 1. Specifically, the drainage channel 10 extends longitudinally along the height direction Y. The upper part of the drainage channel 10 is connected to the inlet of the heat exchanger 5. For example, the upper part of the drainage channel 10 can directly cover the inlet of the heat exchanger 5. The second interface 92 of the temperature control valve can be sealed and connected to the lower part of the drainage channel 10.

[0241] Specifically, the second interface 92 can be inserted into the drainage channel 10 via a sealed plug-in connection. The drainage channel 10 can be used as part of the circulation pipe, integrated into the end of the phase change tank 1. This not only enables water circuit connectivity but also optimizes and simplifies the structure, shortens the length of the circulation pipe, reduces pipe resistance, and makes the structure more compact, which is beneficial for installation in limited space. In addition, the drainage channel 10 and the phase change tank 1 can be an integral structure, which can reduce the number of connection joints and avoid problems such as loose interfaces and aging seals when the phase change tank 1 is connected to the external circulation pipe, further improving the reliability of the electric water heater system's seal.

[0242] Please refer to the following: Figures 7 to 13In one embodiment, the phase change chamber 1 has a first end plate 11 and a second end plate 12 facing each other at its end. The first end plate 11 is located outside the second end plate 12. The first end plate 11 protrudes outward by a first predetermined dimension at a first predetermined position to form the drainage channel 10; or, the second end plate 12 protrudes inward by a first predetermined dimension at a second predetermined position to form the drainage channel 10; or, the first end plate 11 protrudes outward by a second predetermined dimension at a first predetermined position and the second end plate 12 protrudes inward by a third predetermined dimension at a second predetermined position, with the first and second predetermined positions at least partially opposite each other to form the drainage channel 10; or, the phase change chamber 1 further includes a third end plate 13 located outside the first end plate 11. Plate 13 protrudes outward by a first predetermined dimension at a first predetermined position to form the drainage channel 10; or, the phase change chamber 1 further includes a fourth end plate 14, which is located inside the second end plate 12, and protrudes inward by a first predetermined dimension at the second predetermined position to form the drainage channel 10; or, the phase change chamber 1 further includes a fifth end plate 15 located inside the second end plate 12, where the first end plate 11 protrudes outward by a fourth predetermined dimension at a first predetermined position, and the fifth end plate 15 protrudes inward by a fifth predetermined dimension at a fifth predetermined position, and the second end plate 12 has an opening at a position corresponding to the first predetermined position and the fifth predetermined position, and the first end plate 11, the second end plate 12 and the fifth end plate 15 cooperate to form the drainage channel 10.

[0243] In this embodiment, the second end plate 12 serves as a main support plate, and is provided with multiple mounting holes for passing through heat exchange tubes. The first end plate 11 may be provided with a connecting portion for connecting two adjacent heat exchange tube sections.

[0244] The drainage channel 10 can be formed by using the first end plate 11 and / or the second end plate 12, or it can be added by adding it on the side of the first end plate 11 away from the second end plate 12, or by adding it on the side of the second end plate 12 away from the first end plate 11, etc.

[0245] like Figure 8As shown, the drainage channel 10 can be formed by the first end plate 11 protruding outward by a first predetermined dimension at a first predetermined position. For the second end plate 12, since it serves as the main support plate, maintaining the structure of the second end plate 12 while providing an outward protrusion structure on the first end plate 11 helps ensure the stability of the phase change chamber 1 structure. Specifically, the outward protrusion structure can be formed on the first end plate 11 through heat treatment, such as stamping. Specifically, the first predetermined dimension can be the depth of the stamped outward protrusion structure, which can be approximately 10 mm, to ensure that the formed drainage channel 10 does not generate excessive pipe resistance when guiding fluid.

[0246] Or, such as Figure 11 As shown, a third end plate 13 is added to the outside of the first end plate 11, and the drainage channel 10 can be formed by the third end plate 13 protruding outward by a first predetermined size at a first predetermined position. In this embodiment, the drainage channel 10 is provided in a manner equivalent to the above embodiment, by adding an additional third end plate 13 to form the drainage channel 10. Since no stamping or other operations are performed on the first end plate 11 or the second end plate 12, it will not negatively affect the structural strength of the first end plate 11 and the second end plate 12.

[0247] like Figure 9 As shown, the drainage channel 10 can be formed by the second end plate 12 protruding inward by a first predetermined dimension at a second predetermined position. Here, the inward protrusion refers to the side away from the first end plate 11. The specific structure and forming method of the drainage channel 10 can be referred to the above embodiments, and will not be repeated here.

[0248] When the drainage channel 10 is disposed on the second end plate 12, compared with the one disposed on the first end plate 11, since the second end plate 12 does not have a connecting part, and the size of the connecting part on the first end plate 11 is larger than the mounting hole on the second end plate 12, the gap between two adjacent mounting holes is relatively large when the drainage channel 10 is disposed, so that the space that the drainage channel 10 can be arranged is relatively large.

[0249] Or, such as Figure 12 As shown, a fourth end plate 14 is added to the inner side of the second end plate 12, and the drainage channel 10 can be formed by the fourth end plate 14 protruding inward by a first predetermined dimension at the second predetermined position. In this embodiment, the drainage channel 10 is provided in a manner equivalent to the above embodiment, by adding an additional fourth end plate 14 to form the drainage channel 10. Since no stamping or other operations are performed on the first end plate 11 or the second end plate 12, it will not negatively affect the structural strength of the first end plate 11 and the second end plate 12.

[0250] like Figure 10As shown, the drainage channel 10 can be formed by the first end plate 11 protruding outward at a first predetermined position by a second predetermined dimension (depth dimension) and the second end plate 12 protruding inward at a second predetermined position by a third predetermined dimension (depth dimension), with the first predetermined position and the second predetermined position at least partially facing each other.

[0251] The second and third predetermined dimensions are smaller than the first predetermined dimension. Specifically, the second and third predetermined dimensions are approximately half the size of the first predetermined dimension. For example, when the first predetermined dimension is 10mm, the second and third predetermined dimensions can be approximately 5mm.

[0252] In terms of manufacturing process, taking stamping as an example, when the stamping depth is around 5mm, a groove of the corresponding depth can be achieved in a single stamping operation. When the stamping depth reaches around 10mm, it needs to be formed in two stages during stamping. Furthermore, to ensure the structural strength of the stamped end plate itself, the stamped end plate also needs to undergo annealing and other processes to eliminate thermal stress. Therefore, overall, the method of setting shallow protrusions on two end plates and then combining them is simpler to operate and more reliable in terms of manufacturing process.

[0253] Or, such as Figure 13 As shown, a fifth end plate 15 may be added to the inner side of the second end plate 12. The second end plate 12 has openings at positions corresponding to the first predetermined position and the fifth predetermined position. The drainage channel 10 can be formed by the first end plate 11 protruding outward by a fourth predetermined dimension at the first predetermined position, and the fifth end plate 15 protruding inward by a fifth predetermined dimension at the fifth predetermined position, with the first end plate 11, the second end plate 12, and the fifth end plate 15 cooperating to form the channel. The opening on the second end plate 12 at the first predetermined position can be a mounting hole on the second end plate 12.

[0254] In this embodiment, the method of forming the drainage channel 10 does not involve structural modification of the second end plate 12, which can reliably ensure the strength of the second end plate 12. At the same time, shallow grooves are formed on the corresponding protrusion positions on the first end plate 11 and the fifth end plate 15, which makes the manufacturing process simple and more reliable.

[0255] Of course, the specific arrangement of the drainage channel 10 can also be in other ways, and is not limited to the above description. Those skilled in the art may make other changes under the inspiration of the technical essence of this application, but as long as the function and effect achieved are the same as or similar to this application, they should be covered within the scope of protection of this application.

[0256] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0257] The above are merely a few embodiments of this utility model. Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in this utility model. However, the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. An electric water heater, characterized in that, The electric water heater includes: The outer shell contains a water tank and a phase change tank, the phase change tank housing a phase change material for heat storage and release. A circulation pipeline, at least partially disposed within the outer casing, is used to connect the water tank and the phase change tank; A switching device is installed on the circulation pipeline; The electric water heater also includes a first triggering part and a second triggering part; After the first trigger is triggered, the switching device can be used to open the circulation pipeline, so that the hot water in the water tank can circulate between the water tank and the phase change tank through the circulation pipeline. The switching device can also be used to make the water flow through the phase change tank and be heated by the phase change material, and make the water in the water tank and the phase change tank flow to the water terminal. After the second trigger is triggered, the switching device can be used to de-circulate the circulation pipeline; the switching device can also be used to allow water supplied from an external water source or water in the water tank to flow to the water terminal after passing through the phase change tank.

2. The electric water heater as described in claim 1, characterized in that, The water tank is equipped with a heating element; The phase change tank is equipped with a heat exchanger, and the water flowing through the heat exchanger can absorb heat from the phase change material or conduct heat to the phase change material. After the first trigger is triggered, the switching device can be used to open the circulation pipeline, so that the water heated by the heating element in the water tank can circulate between the water tank and the heat exchanger through the circulation pipeline; the switching device can also be used to make water flow through the phase change tank and be heated by the phase change material, and make the water in the water tank and the heat exchanger flow to the water terminal. After the second trigger is triggered, the switching device can be used to de-circulate the circulation pipeline; The switching device can also be used to allow water supplied from an external water source or water in the water tank to flow to the water terminal after passing through the heat exchanger.

3. The electric water heater as described in claim 2, characterized in that, The switching device is a temperature regulating valve. The electric water heater also includes a water supply pipeline. One side of the water supply pipeline is used to connect to an external water source, and the other side of the water supply pipeline is used to connect to the circulation pipeline and / or the heat exchanger and / or the water tank through the temperature regulating valve. The temperature control valve can be used to divert the water supply in the water supply pipeline, with part of the water supply flowing into the heat exchanger and the water tank, and the other part of the water supply mixing with the water flowing out of the heat exchanger and the water tank.

4. The electric water heater as described in claim 3, characterized in that, The heat exchanger and the water tank can be connected in series through the circulation pipeline to supply water, and the temperature control valve can be used to allow a portion of the water supply in the water supply pipeline to flow sequentially into the heat exchanger and the water tank.

5. The electric water heater as described in claim 4, characterized in that, The circulation pipeline includes a first circulation pipeline and a second circulation pipeline. The first circulation pipeline has a first water inlet and a first water outlet. The first water inlet is located in the water tank and the first water outlet is located in the phase change tank. The second circulation pipeline has a second water inlet and a second water outlet. The second water inlet is located in the phase change tank and the second water outlet is located in the water tank. The temperature control valve is installed on either the first circulation pipeline or the second circulation pipeline.

6. The electric water heater as described in claim 5, characterized in that, The first water inlet is located at the upper part of the water tank, the first water outlet is located at the upper part of the phase change tank, the second water inlet is located at the lower part of the phase change tank, and the second water outlet is located at the lower part of the water tank.

7. The electric water heater as described in claim 6, characterized in that, The temperature control valve is installed on the first circulation pipeline, and the other side of the water supply pipeline is connected to the first circulation pipeline through the temperature control valve; The temperature control valve can be used to divert the water supply in the water supply pipeline, with part of the water supply flowing into the heat exchanger, the water flowing out of the heat exchanger entering the water tank through the second circulation pipeline, and the water flowing out of the water tank flowing out through the first circulation pipeline. The remaining part of the water supply can mix with the water flowing out of the water tank.

8. The electric water heater as described in claim 7, characterized in that, The temperature control valve includes at least a first interface, a second interface, and a third interface. The first interface is used to connect to the other side of the water supply pipeline, and the second and third interfaces are both connected to the first circulation pipeline. The temperature control valve can be used to allow the water in the water tank to circulate between the water tank and the heat exchanger. Along the water flow direction, the third interface and the second interface are sequentially connected. The temperature control valve can also be used to prevent the third interface from being connected to the second interface, so that the water in the water tank does not circulate between the water tank and the heat exchanger.

9. The electric water heater as described in claim 8, characterized in that, The temperature control valve can be used to enable the first interface to be connected to the second interface and the third interface.

10. The electric water heater as described in claim 9, characterized in that, The temperature control valve can be used to structurally connect the first interface to the second interface and / or the third interface, but not to conduct water.

11. The electric water heater as described in claim 4, characterized in that, The electric water heater also includes a water outlet pipe, one end of which is used to connect to the circulation pipe or the temperature control valve, and the other end of which is used to connect to the water terminal.

12. The electric water heater as described in claim 1, characterized in that, The phase change tank is located above the water tank or positioned to the left and right of the water tank. The hot water in the water tank can circulate naturally between the water tank and the phase change tank through the circulation pipe.

13. The electric water heater as described in claim 1, characterized in that, A heating element is provided in the middle or lower part of the water tank; The phase change tank is located above the water tank; the phase change tank is equipped with a heat exchanger, and the water flowing through the heat exchanger can absorb heat from the phase change material or conduct heat to the phase change material. The electric water heater also includes a switching device, which is detachably mounted on the phase change tank; The circulation pipeline includes a first circulation pipeline and a second circulation pipeline. One end of the first circulation pipeline is connected to the water tank, and the other end is connected to the heat exchanger through the switching device. One end of the second circulation pipeline is connected to the heat exchanger, and the other end is connected to the water tank. The electric water heater also includes a water supply pipe and a water outlet pipe. One end of the water supply pipe can be connected to a water source, and the other end is connected to the switching device. One end of the water outlet pipe is connected to the switching device, and the other end is used to connect to a water terminal. The switching device, the circulation pipe, the water supply pipe, and the water outlet pipe are combined to form a water circuit assembly. At least a portion of the water circuit assembly is disposed in the outer casing.

14. The electric water heater as described in claim 13, characterized in that, Both the phase change tank and the water tank extend horizontally. The phase change tank is shorter than the water tank. One end of the phase change tank forms an installation space between the water tank and the end cap of the outer casing to accommodate the water circuit assembly.

15. The electric water heater as described in claim 13, characterized in that, The housing has opposing front and rear sides, the water circuit assembly is disposed near the rear side of the housing, and the electric water heater also includes a computer board disposed near the front side of the housing.

16. The electric water heater as described in claim 15, characterized in that, The switching device is located on the upper part near the rear side of the housing, and the inlet of the water supply pipe and the outlet of the water outlet pipe are located on the lower part near the rear side of the housing.

17. The electric water heater as described in claim 15, characterized in that, The computer board is positioned above the front side of the housing.

18. The electric water heater as described in claim 13, characterized in that, The switching device includes a valve body, a valve core disposed in the valve body, and a motor for driving the valve core to move. The valve body includes a first interface, a second interface, a third interface, and a fourth interface. The first interface is used to connect to the water supply pipeline, the second interface is used to seal and connect to the phase change tank, the third interface is connected to the other end of the first circulation pipeline, and the fourth interface is connected to the water outlet pipeline.

19. The electric water heater as described in claim 18, characterized in that, The first interface, the third interface, and the fourth interface all face the end cap of the housing.

20. The electric water heater as described in claim 18, characterized in that, The second and third interfaces are positioned closer to the valve core than the first and second interfaces.

21. The electric water heater as described in claim 18, characterized in that, The motor is located at the top of the valve body.

22. The electric water heater as described in claim 13, characterized in that, At least one of the water supply pipeline, the water outlet pipeline, and the circulation pipeline is a flexible connecting pipe.

23. The electric water heater as described in claim 22, characterized in that, The flexible connecting pipe includes PPR pipe and / or metal corrugated pipe.

24. The electric water heater as described in claim 22, characterized in that, The connector of the flexible connecting tube is a metal part or a metal insert set on a plastic material.

25. The electric water heater as described in claim 13, characterized in that, The end of the phase change chamber is provided with a flow channel for connecting the switching device and the heat exchanger, and the flow channel is used as part of the circulation pipeline.

26. The electric water heater as described in claim 25, characterized in that, The phase change chamber is provided with a first end plate and a second end plate at opposite ends, with the first end plate located outside the second end plate. The first end plate protrudes outward by a first predetermined dimension at a first predetermined position to form the drainage channel; Alternatively, the second end plate protrudes inward by a first predetermined dimension at a second predetermined position to form the drainage channel; Alternatively, the first end plate protrudes outward by a second predetermined dimension at a first predetermined position and the second end plate protrudes inward by a third predetermined dimension at a second predetermined position, with the first and second predetermined positions at least partially facing each other to form the drainage channel; Alternatively, the phase change chamber may further include a third end plate, which is located outside the first end plate and protrudes outward by a first predetermined size at a first predetermined position to form the drainage channel; Alternatively, the phase change chamber may further include a fourth end plate, which is located inside the second end plate and protrudes inward by a first predetermined dimension at the second predetermined position to form the drainage channel; Alternatively, the phase change chamber may further include a fifth end plate located inside the second end plate, the first end plate protruding outward by a fourth predetermined dimension at a first predetermined position, the fifth end plate protruding inward by a fifth predetermined dimension at a fifth predetermined position, and the second end plate having an opening at a position corresponding to the first predetermined position and the fifth predetermined position, the first end plate, the second end plate and the fifth end plate cooperating to form the drainage channel.

27. The electric water heater as described in claim 25, characterized in that, The drainage channel extends longitudinally along the height direction, with the upper part of the drainage channel connected to the water inlet of the heat exchanger, and the switching device sealed and connected to the lower part of the drainage channel.

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