Instantaneous electric water heater

Abstract

The application relates to an instant electric water heater, which comprises a heating element, a bypass pipeline, a controllable switch valve, a water inlet pipeline and a water outlet pipeline; the first end of the bypass pipeline is connected with the water inlet end of the heating element, the second end of the bypass pipeline is connected with the water outlet end of the heating element, the inner diameter of the bypass pipeline is smaller than the corresponding pipe diameters of the water inlet end and the water outlet end of the heating element; the controllable switch valve is arranged on the bypass pipeline; the water inlet end of the heating element is connected with the water inlet pipeline, and the water outlet end of the heating element is connected with the water outlet pipeline; compared with the prior art, the technical scheme of the application can reduce the water stop temperature rise, prevent the over-shunting of cold water from causing the over-temperature of the heating element, ensure the stable water outlet temperature and prolong the service life of the equipment.

Description

Technical Field

[0001] This application relates to the field of water heater technology, and more particularly to an instant electric water heater. Background Technology

[0002] Currently, most mainstream instant electric water heaters on the market use a flow-through cast aluminum heater as the core heating component. However, instant electric water heaters with flow-through cast aluminum heaters have a problem with temperature rise during water outages in actual use. When the user closes the outlet valve and stops using water, although the cast aluminum heater stops heating simultaneously, due to the thermal inertia of the cast aluminum material, the heater body still stores a large amount of residual heat that has not been fully released. This residual heat will continue to be transferred to the inlet and outlet water pipes connected to the heater, causing the water remaining in the pipes to be further heated, forming high-temperature water accumulation. According to actual test data, the value of this temperature rise during water outages is usually between 10K and 30K, and even higher under some operating conditions. When the user opens the outlet valve again to use water in a short period of time, the high-temperature water stored in the pipes will flow out first, which can easily cause burns to the user's skin and seriously affect the safety and comfort of use.

[0003] Currently, some improvement solutions have been proposed in the industry. A typical approach is to add a bypass pipe between the inlet and outlet of the heater. The bypass pipe directly guides the cold water at the front end of the heater to the outlet, so that the cold water and the hot water flowing out of the heater can be mixed and flushed. This is intended to reduce the outlet temperature through heat exchange and thus alleviate the problem of temperature rise during water outages.

[0004] However, in this improved design, the addition of a bypass pipe diverts some of the incoming water, resulting in a decrease in the water flow rate into the heater. With the heater's heating power remaining unchanged, the water flowing through the heater experiences a longer heating time, leading to significantly higher outlet water temperatures and heater surface temperatures compared to the conventional structure without a bypass pipe. This not only easily triggers the heater's over-temperature protection function, causing frequent equipment shutdowns, but also accelerates component aging due to the heater operating at high temperatures for extended periods, drastically shortening its lifespan. It is difficult to simultaneously meet the dual requirements of improving water supply temperature rise during shutdowns and ensuring stable equipment operation. Utility Model Content

[0005] This application provides an instant electric water heater that reduces the temperature rise during water outages while preventing excessive cold water diversion that could cause the heating element to overheat, thus ensuring stable outlet water temperature and extending the lifespan of the equipment.

[0006] In a first aspect, this application provides an instantaneous electric water heater, comprising: a heating element, a bypass pipe, a controllable switch valve, an inlet pipe, and an outlet pipe; a first end of the bypass pipe is connected to the inlet end of the heating element, and a second end of the bypass pipe is connected to the outlet end of the heating element; the inner diameter of the bypass pipe is smaller than the corresponding pipe diameters of the inlet end and the outlet end of the heating element; the controllable switch valve is disposed on the bypass pipe; the inlet end of the heating element is connected to the inlet pipe, and the outlet end of the heating element is connected to the outlet pipe.

[0007] In one possible implementation, the controllable switching valve is a normally open valve or a normally closed valve.

[0008] In one possible implementation, the bypass pipe is in a closed state when the controllable switch valve is closed; the bypass pipe is in a conductive state when the controllable switch valve is opened.

[0009] The instantaneous electric water heater provided in this application further includes: a flow detection element; wherein the flow detection element is disposed on the water inlet pipe connected to the water inlet end of the heating element.

[0010] The instantaneous electric water heater provided in this application further includes: a temperature detection element; wherein the temperature detection element is disposed on the water outlet pipe connected to the water outlet end of the heating element.

[0011] The instantaneous electric water heater provided in this application further includes: a control element; wherein the control element is electrically connected to the temperature detection element, the flow detection element, the heating element and the controllable switching valve respectively.

[0012] The instantaneous electric water heater provided in this application further includes: a housing; the control element, the temperature detection element, the flow detection element, the heating element, the controllable switching valve, and the bypass pipe are disposed inside the housing.

[0013] This application provides an instantaneous electric water heater, which further includes: a water switch element, a water outlet, and a water inlet; wherein the water inlet is connected to the water inlet pipe; the water outlet is connected to the water outlet pipe, and the water switch element is disposed at the water outlet.

[0014] In one possible implementation, the water switching element is a water outlet valve, wherein the water outlet valve is a mixing valve or a ball valve.

[0015] In one possible implementation, the inlet and outlet pipes of the heating element have the same diameter, and the inner diameter of the bypass pipe is 0.6-0.7 times the diameter of the inlet and outlet pipes of the heating element.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art:

[0017] This application provides an instantaneous electric water heater, comprising: a heating element, a bypass pipe, a controllable switch valve, an inlet pipe, and an outlet pipe; a first end of the bypass pipe is connected to the inlet end of the heating element, and a second end of the bypass pipe is connected to the outlet end of the heating element; the inner diameter of the bypass pipe is smaller than the pipe diameters corresponding to the inlet and outlet ends of the heating element; the controllable switch valve is disposed on the bypass pipe; the inlet end of the heating element is connected to the inlet pipe, and the outlet end of the heating element is connected to the outlet pipe; compared with the prior art, the technical solution of this application improves upon the prior art by connecting the two ends of the bypass pipe to the inlet and outlet ends of the heating element respectively, setting the inner diameter of the bypass pipe to be smaller than the pipe diameters corresponding to the inlet and outlet ends of the heating element, and [further details about the bypass pipe are needed]. The system is equipped with a controllable on / off valve, connecting the inlet and outlet ends of the heating element to the inlet and outlet pipes respectively. When the user turns on the water, the controllable on / off valve opens the bypass pipe, allowing some cold water to flow through the bypass pipe and mix with the residual hot water at the heating element's outlet. This effectively reduces the temperature rise during water outages, preventing scalding when the user resumes use shortly after. Furthermore, the smaller diameter of the bypass pipe prevents excessive cold water diversion, which could lead to insufficient water intake to the heating element or excessively high surface and outlet temperatures. After the cooling process is complete, the controllable on / off valve closes the bypass pipe, allowing full flow of cold water through the heating element. This ensures stable heating efficiency and outlet temperature, preventing the heating element from triggering overheat protection, reducing wear and tear on the heating element, and extending the equipment's lifespan. It balances safety, bathing comfort, and equipment stability. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0021] Figure 1 This is a schematic diagram of the structure of an instantaneous electric water heater provided in an embodiment of this application;

[0022] Figure 2 This is another structural schematic diagram of an instant electric water heater provided in an embodiment of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0025] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0026] Figure 1 This is a schematic diagram of the structure of an instantaneous electric water heater provided in an embodiment of this application; as shown. Figure 1 As shown, the instantaneous electric water heater includes a heating element 11, a bypass pipe 12, a controllable on / off valve 13, an inlet pipe 14, and an outlet pipe 15, as detailed below:

[0027] In one embodiment, the first end of the bypass pipe 12 is connected to the water inlet of the heating element 11, and the second end of the bypass pipe 12 is connected to the water outlet of the heating element 11. The inner diameter of the bypass pipe 12 is smaller than the pipe diameters corresponding to the water inlet and water outlet of the heating element 11. The controllable switch valve 13 is disposed on the bypass pipe 12. The water inlet of the heating element 11 is connected to the water inlet pipe 14, and the water outlet of the heating element 11 is connected to the water outlet pipe 15.

[0028] Specifically, the heating element 11, as the core heating component, adopts a flow-through structure, such as a cast aluminum heater. The heating element 11 has an inlet and outlet water flow channel through which water flows, which can quickly convert electrical energy into heat energy and transfer it to the flowing cold water to achieve instant hot water supply.

[0029] Specifically, the bypass pipe 12 is made of corrosion-resistant material compatible with the water system of the water heater, and must meet the requirements of no rust and no harmful substances leaching when in contact with cold / hot water for a long time. The bypass pipe 12 and the heating element 11 are connected in parallel. The bypass pipe 12 is used to allow water to flow into the instant water heater in the event of a water outage and temperature rise. One path enters the heating element 11 to be heated into hot water, and the other path enters the bypass pipe 12. The two paths are flushed and mixed at the outlet of the heating element 11, thereby reducing the water temperature.

[0030] Specifically, the inner diameter of the bypass pipe 12 is 0.6-0.7 times the pipe diameter corresponding to the water inlet and water outlet of the heating element 11.

[0031] In current bypass pipe solutions for addressing temperature rise during water outages, if the inner diameter of the bypass pipe 12 is too small, insufficient cold water will flow through it, failing to dilute the hot water temperature flowing from the heating element 11, resulting in a negligible decrease in temperature rise during outages and failing to eliminate the risk of scalding. Conversely, if the inner diameter of the bypass pipe 12 is too large, excessive cold water will flow through it, leading to excessive water diversion and reduced water flow to the heating element 11, or even bypassing it entirely. In this case, with the heating power of the heating element 11 remaining constant, it is prone to overheating, shortening its lifespan and reducing heating efficiency. However, the bypass pipe design described in this application... The inner diameter of the bypass pipe 12 is 0.6-0.7 times the diameter of the corresponding pipe at the inlet and outlet of the heating element 11. This ensures that the bypass pipe 12 can guide a sufficient amount of cold water, preventing scalding of users. It also limits the proportion of cold water flowing through the bypass pipe 12, allowing most of the cold water to still enter the heating element 11 and be heated. This avoids a sudden rise in the surface temperature of the heating element 11 due to high power heating with a small flow rate, preventing overheat protection from triggering frequent equipment shutdowns and reducing wear and tear on the heating element 11, thus extending its service life. At the same time, a sufficient flow of water through the heating element 11 ensures heating efficiency and prevents the problem of low outlet water temperature caused by insufficiently heated cold water flowing out directly.

[0032] Specifically, the inner diameter of the bypass pipe 12 is set to 0.6-0.7 times the pipe diameter corresponding to the inlet and outlet ends of the heating element 11. Through precise proportional control, the problem of ineffective cooling caused by too small a pipe diameter is avoided, as well as the heating abnormality caused by too large a pipe diameter is avoided. This achieves the dual goals of reducing the temperature rise during water outages and ensuring stable heating, completely breaking through the technical bottleneck of traditional solutions and taking into account both user safety and equipment operation reliability.

[0033] Preferably, the inner diameter of the bypass pipe 12 can be set to 6mm, and the pipe diameters corresponding to the water inlet and water outlet of the heating element 11 can be 9.5mm.

[0034] Specifically, the controllable switching valve 13 is a normally open valve or a normally closed valve; preferably, the controllable switching valve 13 can also be a solenoid valve or an electric valve.

[0035] Specifically, the normally closed valve is in the closed state by default and is only opened when the bypass pipe 12 is needed to divert flow; the normally open valve is in the open state by default and is only closed when the bypass pipe 12 needs to be shut off; the controllable switch valve 13 is directly mounted on the bypass pipe 12 and is electrically connected to the control element 21 in the instantaneous water heater through a wire. It can accurately receive the control signal sent by the control element 21 to switch the on / off state and is the key execution component for realizing on-demand bypass.

[0036] Specifically, both the inlet pipe 14 and the outlet pipe 15 are made of pipe materials that are compatible with the interface of the heating element 11. The inner diameters of the inlet pipe 14 and the outlet pipe 15 must match the inner diameters of the inlet and outlet pipes of the heating element 11. That is, the inner diameter of the inlet pipe 14 matches the diameter of the inlet pipe of the heating element 11, and the inner diameter of the outlet pipe 15 matches the diameter of the outlet pipe of the heating element 11. This ensures that the water flow in the main heating channel is unobstructed by a narrowing of the pipe diameter, avoiding excessively fast water flow and increased noise due to an excessively small inner diameter, or excessive residual water in the pipe due to an excessively large inner diameter, which could lead to an increased risk of temperature rise during water outages.

[0037] In one embodiment, the bypass pipe 12 is in a closed state when the controllable switch valve 13 is closed; the bypass pipe 12 is in a conductive state when the controllable switch valve 13 is opened.

[0038] Specifically, the controllable switching valve 13, as the core component for flow control of the bypass pipe 12, is directly connected in series on the bypass pipe 12, forming a correspondence where the valve state determines the water flow state in the pipe.

[0039] Specifically, the controllable switching valve 13 is an actuator controlled by the controller to open and close. The controllable switching valve 13 has a movable valve core or valve disc inside. When the control element 21 sends an opening command, the valve core moves to completely open the internal flow channel of the controllable switching valve 13. The inlet and outlet of the bypass pipe 12 are connected through the internal flow channel. Cold water can flow smoothly from the inlet of the heating element 11 to the outlet of the heating element 11 through the bypass pipe 12. At this time, the bypass pipe 12 is in a conducting state. When the control element 21 sends a closing command, the valve core resets and blocks the internal flow channel of the controllable switching valve 13. Cold water cannot flow through the controllable switching valve 13 in the bypass pipe 12. The water flow path of the bypass pipe 12 is completely blocked. At this time, the bypass pipe 12 is in a closed state. This structural design ensures that the water flow state of the bypass pipe 12 is completely and precisely controlled by the action of the controllable switching valve 13, without intermediate redundant links, avoiding abnormal situations such as the valve being closed but the pipe still having water flow or the valve being open but the pipe water flow being obstructed.

[0040] like Figure 2 As shown, Figure 2 This is another structural schematic diagram of an instant electric water heater provided in an embodiment of this application.

[0041] In one embodiment, the instantaneous electric water heater provided in this application further includes: a water switch element 16, a water outlet 17, and a water inlet 18.

[0042] Specifically, the inlet 18 is connected to the inlet pipe 14; the outlet 17 is connected to the outlet pipe 15; and the water switch element 16 is located at the outlet 17.

[0043] Specifically, both ends of the inlet pipe 14 and the outlet pipe 15 are equipped with sealed interfaces, which respectively connect the inlet port 18 to the inlet end of the heating element 11 and the outlet end of the heating element 11 to the outlet port 17, ensuring the overall sealing of the water system.

[0044] Specifically, the inlet 18 and outlet 17 serve as the starting point and ending point of the water supply system of the water heater, respectively. The inlet 18 is directly connected to the inlet pipe 14, allowing external cold water, such as tap water, to enter the water heater through the inlet 18 and be transported to the inlet end of the heating element 11 via the inlet pipe 14, providing a water source for the subsequent heating process. The outlet 17 is connected to the outlet pipe 15, and the hot water heated by the heating element 11 is transported to the outlet 17 via the outlet pipe 15, ultimately flowing to the user's water supply end.

[0045] Specifically, the water switch element 16 is the core component for users to directly control the water usage status and is located at the water outlet 17; the water switch element 16 is a water outlet valve, wherein the water outlet valve is a mixing valve or a ball valve.

[0046] In one embodiment, the instantaneous electric water heater provided in this application further includes: a flow detection element 19, a temperature detection element 20, and a control element 21.

[0047] In one embodiment, the control element 21 is electrically connected to the temperature detection element 20, the flow detection element 19, the heating element 11, and the controllable switching valve 13, respectively.

[0048] Specifically, the flow detection element 19 is installed on the water inlet pipe 14 connected to the water inlet end of the heating element 11.

[0049] Specifically, the temperature detection element 20 is installed on the water outlet pipe 15 connected to the water outlet end of the heating element 11.

[0050] Specifically, the flow detection unit is a water flow sensor.

[0051] Specifically, the flow detection element 19, as a key component for water usage status identification, is installed on the water inlet pipe 14 connected to the water inlet end of the heating element 11. The flow detection unit is used to detect the water inlet flow of the instantaneous water heater and determine the water flow status in conjunction with a preset flow threshold.

[0052] Specifically, based on the flow detection element 19, which can collect the water flow velocity and flow rate in the water inlet pipe 14 in real time, when the detected flow rate is greater than the preset flow threshold, it is determined that the user is in the water usage state, and then a water flow signal is sent to the control element 21. This causes the control element 21 to trigger the heating element 11 to start and the controllable switch valve 13 to switch states, such as the normally open valve closing with a delay and the normally closed valve opening immediately, based on its connection relationship with the heating element 11 and the controllable switch valve 13. When the detected flow rate is not greater than the preset flow threshold, it is determined that the user has stopped using water, and a no-water-flow signal is sent to the control element 21, causing the control element 21 to trigger the heating element 11 to close. If the controllable switch valve 13 is a normally open valve, it will also open synchronously.

[0053] Preferably, the flow detection element 19 is installed close to the water inlet 18, which can quickly detect the water intake status of the instantaneous water heater, so that the control element 21 can react quickly.

[0054] Specifically, the temperature detection element 20 is a temperature sensor, such as a thermistor or thermocouple, which has high temperature detection accuracy, can capture the temperature change of hot water after heating in real time, and convert the temperature data into an electrical signal and transmit it to the control element 21.

[0055] Specifically, the temperature detection element 20, as a key component for monitoring the outlet water temperature, is installed on the outlet pipe 15 connected to the outlet end of the heating element 11; the temperature detection element 20 is used to detect the outlet water temperature.

[0056] Specifically, based on the real-time detection of the outlet water temperature by the temperature detection element 20, when the detected outlet water temperature is higher than the user-set target temperature, the control element 21 will adjust the power of the heating element 11 according to the signal, such as reducing the heating power to avoid scalding due to excessively high water temperature; when the detected outlet water temperature is lower than the target temperature, the power of the heating element 11 will be increased to ensure that the outlet water temperature is stable within a comfortable range. At the same time, the detection data of this element can also help determine whether the heating element 11 is in normal working condition. If the temperature is abnormally high, over-temperature protection can be triggered to further ensure the safe operation of the equipment.

[0057] Specifically, the control element 21, as the core hub of the instantaneous water heater, is electrically connected to the temperature detection element 20, the flow detection element 19, the heating element 11, and the controllable switching valve 13 via wires.

[0058] Specifically, the control element 21 has the functions of controlling the start and stop of the heating element 11 and its power, and controlling the on and off of the controllable switching valve 13. The control element 21 is a controller with an integrated MCU and a built-in preset control logic program. On the one hand, it receives the water flow signal from the flow detection element 19 and determines whether to start / stop the heating element 11 and whether to switch the state of the controllable switching valve 13 according to the program. For example, the normally closed valve opens and closes after a delay when there is a water flow signal. On the other hand, it receives the temperature signal from the temperature detection element 20, calculates the temperature difference through an internal algorithm, and sends a power adjustment command to the heating element 11 to achieve precise control of the outlet water temperature.

[0059] Specifically, the control element 21 can also coordinate the working sequence of each component. For example, when the user turns on the water, the heating element 11 and the controllable switch valve 13 are started first through the flow signal. After a delay of T0, the controllable switch valve 13 is closed. The purpose of the delay is to ensure that the cold water and the residual hot water are fully flushed, so as to ensure the orderly connection between flushing cooling and normal heating. This solves the problem of water outage temperature rise, and ensures heating efficiency and water temperature stability, realizing the coordinated linkage of each component.

[0060] In one embodiment, when the controllable switching valve 13 is a normally open valve, the controllable switching valve 13 is closed after a preset time under the control of the control element 21 as the heating element 11 is turned on; when the controllable switching valve 13 is a normally open valve, the controllable switching valve 13 is opened under the control of the control element 21 as the heating element 11 is turned off; when the controllable switching valve 13 is a normally closed valve, the controllable switching valve 13 is open for a preset time under the control of the control element 21 as the heating element 11 is started.

[0061] Specifically, the preset time is t0, and the setting of the preset time is related to the water flow rate and the outlet water temperature.

[0062] Example Description: When the controllable switch valve 13 is a normally closed valve: When the outlet valve is opened and water is used, if the water flow sensor detects whether the inlet water flow is greater than the preset flow threshold, the heating element 11 is activated. At the same time, the controllable switch valve 13 on the bypass pipe 12 is opened, and the bypass pipe 12 is open. The cold water entering from the inlet 18 is divided into two paths: one path enters the heating element 11 to be heated into hot water, and the other path enters the bypass pipe 12. The two paths are mixed at the outlet of the heating element 11, thereby reducing the water temperature. After a preset delay T0, the controllable switch valve 13 is closed, and the bypass pipe 12 is shut off. When the current flow is detected to be less than the preset flow threshold, the heating element 11 is turned off.

[0063] When the switch valve is a normally open valve: When the outlet valve is opened and water is used, the water flow sensor detects that the inlet water flow is greater than the preset flow threshold, and the heating element 11 is activated. At this time, since the controllable switch valve 13 is a normally open valve, it is in the open state. The bypass pipe 12 is open, and the cold water entering from the inlet 18 is divided into two paths. One path enters the heating element 11 to be heated into hot water, and the other path enters the bypass pipe 12. The two paths are flushed and mixed at the outlet of the heating element 11, thereby reducing the water temperature. After a preset delay of T0, the controller controls the switch valve to close and the bypass pipe 12 to be cut off. When the current flow is detected to be not less than the preset flow threshold, the heating element 11 is turned off, and the controllable switch valve 13 is opened at the same time.

[0064] In one embodiment, the instantaneous electric water heater provided in this application further includes: a housing 22.

[0065] In one embodiment, the control element 21, the temperature detection element 20, the flow detection element 19, the heating element 11, the controllable switching valve 13, and the bypass pipe 12 are disposed inside the housing 22.

[0066] Specifically, the outer casing 22 is used to provide a stable installation space and all-round protection for the internal components.

[0067] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0068] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0069] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0070] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0071] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0073] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0074] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An electric water heater of the instant heating type, characterized in that, include: Heating element, bypass pipe, controllable on / off valve, inlet pipe and outlet pipe; The first end of the bypass pipe is connected to the water inlet of the heating element, and the second end of the bypass pipe is connected to the water outlet of the heating element. The inner diameter of the bypass pipe is smaller than the pipe diameter corresponding to the water inlet and the water outlet of the heating element. The controllable switching valve is installed on the bypass pipe; The water inlet of the heating element is connected to the water inlet pipe, and the water outlet of the heating element is connected to the water outlet pipe.

2. The electric instantaneous water heater according to claim 1, wherein The controllable switching valve is either a normally open valve or a normally closed valve.

3. The electric instantaneous water heater according to claim 2, wherein The bypass pipe is in a closed state when the controllable switch valve is closed; the bypass pipe is in a conductive state when the controllable switch valve is opened.

4. The electric instantaneous water heater according to claim 3, wherein Also includes: Flow detection element; The flow detection element is installed on the water inlet pipe connected to the water inlet end of the heating element.

5. The instantaneous electric water heater according to claim 4, characterized in that, Also includes: Temperature sensing element; The temperature detection element is installed on the water outlet pipe connected to the water outlet end of the heating element.

6. The electric instantaneous water heater according to claim 5, wherein Also includes: Control elements; The control element is electrically connected to the temperature detection element, the flow detection element, the heating element, and the controllable switching valve, respectively.

7. The electric instantaneous water heater according to claim 6, wherein Also includes: shell; The control element, the temperature detection element, the flow detection element, the heating element, the controllable switching valve, and the bypass pipe are disposed inside the housing.

8. The electric instantaneous water heater according to claim 1, wherein Also includes: Water switch components, water outlet and water inlet; The water inlet is connected to the water inlet pipe; The water outlet is connected to the water outlet pipe, and the water switch element is located at the water outlet.

9. The electric instantaneous water heater according to claim 8, wherein The water switch element is a water outlet valve, wherein the water outlet valve is a mixing valve or a ball valve.

10. The electric instantaneous water heater according to claim 1, wherein The inlet and outlet pipes of the heating element have the same diameter, and the inner diameter of the bypass pipe is 0.6-0.7 times the diameter of the inlet and outlet pipes of the heating element.

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