An instant heater

Abstract

The application relates to an instant heater, which comprises an electric heating body, a water inlet pipe, a Venturi tube and a bypass pipe; the electric heating body is provided with a water inlet and a water outlet; the water inlet pipe is communicated with the water inlet; the Venturi tube comprises a contraction section, a suction section and an expansion section which are connected in sequence, and the contraction section is communicated with the water outlet; one end of the bypass pipe is connected to the water inlet pipe, and the other end is connected to the suction section. By arranging the Venturi tube and the bypass pipe, the special structure of the Venturi tube and the introduction of cold water by the bypass pipe are utilized, so that when the water inlet is reopened, the temperature of the water initially flowing out of the water outlet can be effectively reduced, the scalding risk caused by the temperature rise during water stoppage is reduced, and compared with the conventional bypass pipe, the problem of the temperature rise during water stoppage of the instant heater with high power density can be more effectively solved.

Description

Technical Field

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

[0002] Instantaneous heaters are widely used in domestic hot water and industrial preheating due to their advantages of providing heat instantly and requiring no preheating. Their core principle lies in using an electric heating element to rapidly heat the flowing fluid.

[0003] Currently available instant water heaters continue to heat the remaining water in the heating chamber and pipes after the water supply stops, due to residual heat from the heating element. This causes a significant temperature rise (known as "water outage temperature rise"). When the user turns the water back on, the water initially flowing from the outlet is too hot, posing a risk of scalding.

[0004] To address this issue, existing technologies typically involve adding a bypass pipe between the heater's inlet and outlet. This allows some of the cold water to flow directly into the outlet side via this bypass pipe during re-intake, mixing with the hot water to lower the initial temperature. However, for instantaneous heaters with high power density per unit volume, the temperature rise during water outages is significant, and conventional bypass pipes alone are insufficient to effectively suppress the high temperatures. Simply increasing the bypass pipe diameter to increase the cold water mixing flow rate can actually increase local flow resistance due to the increased insertion depth, potentially reducing the actual bypass flow rate and failing to effectively address the water outage temperature rise problem. Utility Model Content

[0005] The purpose of this application is to provide an instantaneous heater to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] An instantaneous heater includes a heating element, an inlet pipe, a venturi tube, and a bypass pipe;

[0008] The heating element has a water inlet and a water outlet;

[0009] The water inlet pipe is connected to the water inlet;

[0010] The Venturi tube includes a constriction section, an adsorption section, and a flaring section connected in sequence, and the constriction section is connected to the outlet.

[0011] One end of the bypass pipe is connected to the water inlet pipe, and the other end is connected to the adsorption section.

[0012] Furthermore, the diameter of the bypass pipe is smaller than the diameter of the adsorption section.

[0013] Furthermore, the venturi tube also includes an inlet flow stabilization section, which is a straight pipe with a uniform cross-section. Its inlet end is connected to the outlet, and its outlet end is connected to the inlet end of the contraction section.

[0014] Furthermore, the electric heating element is provided with a heat-conducting medium and a heat exchange coil. One end of the heat exchange coil is connected to the water inlet pipe through the water inlet, and the other end is connected to the inlet flow stabilization section. The heat-conducting medium covers the heat exchange coil and contacts the outer wall of the heat exchange coil.

[0015] Furthermore, the heat-conducting medium is a metal.

[0016] Furthermore, it also includes an electric heating element disposed within the heating element, the heating portion of which is covered or in close contact with the heat-conducting medium, and the electrodes of the electric heating element protrude through the housing of the heating element to connect to an external power source.

[0017] Furthermore, the electrode includes a positive electrode and a negative electrode, which are configured to extend from the same side of the housing of the heating element, or from different sides of the housing of the heating element, respectively.

[0018] Furthermore, the Venturi tube also includes an outlet flow stabilization section, which is a straight pipe with a uniform cross-section. Its inlet end is connected to the outlet end of the flared section, and its outlet end serves as the hot water outlet of the instantaneous heater.

[0019] The technical solutions provided in this application have the following advantages compared with the prior art:

[0020] The instantaneous heater provided in this application embodiment, when operating, allows cold water to enter through the inlet pipe, flow into the heating element through the inlet, and be heated. The heated hot water then flows out through the outlet of the heating element and into the contraction section of a venturi tube. Within the venturi tube, the hot water sequentially passes through the contraction section, the adsorption section, and the flaring section. Simultaneously, a bypass pipe connects one end to the inlet pipe and the other end to the adsorption section. When water is introduced again, some of the cold water passes through the bypass pipe directly into the adsorption section of the venturi tube, where it mixes with the high-temperature water heated by the heating element.

[0021] This application utilizes a Venturi tube and a bypass tube, along with the special structure of the Venturi tube and the bypass tube to introduce cold water. When the water inlet is reopened, the temperature of the water initially flowing out of the outlet can be effectively reduced, thus minimizing the risk of scalding due to temperature rise during water outages. Compared to the traditional method that relies solely on a conventional bypass tube, this approach more effectively addresses the issue of temperature rise during water outages in high-power-density instantaneous heaters. Attached Figure Description

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Figure 1 This is a perspective view of an instantaneous heater provided in an embodiment of this application.

[0026] Figure 2 This is a cross-sectional structural diagram of an instantaneous heater provided in an embodiment of this application.

[0027] Figure 3 This is a schematic diagram of the structure of the electric heating tube provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Heating element; 11. Water inlet; 12. Water outlet;

[0030] 2. Water inlet pipe;

[0031] 3. Venturi tube; 31. Contraction section; 32. Adsorption section; 33. Flaring section; 34. Inlet flow stabilization section; 35. Outlet flow stabilization section;

[0032] 4. Bypass pipe; 5. Heat transfer medium; 6. Heat exchange coil;

[0033] 7. Heating element; 71. Electrode; 711. Positive electrode; 712. Negative electrode. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] Figures 1 to 3 An instantaneous heater provided in this application includes an electric heating element 1, a water inlet pipe 2, a venturi tube 3, and a bypass pipe 4. The electric heating element 1 has a water inlet 11 and a water outlet 12. The water inlet pipe 2 is connected to the water inlet 11. The venturi tube 3 includes a contraction section 31, an adsorption section 32, and a flaring section 33 connected in sequence. The contraction section 31 is connected to the water outlet 12. One end of the bypass pipe 4 is connected to the water inlet pipe 2, and the other end is connected to the adsorption section 32.

[0038] Specifically, in practical applications, cold water flows in from the inlet pipe 2 and enters the interior of the heating element 1 through the inlet 11 connected to it. Inside the heating element 1, the cold water absorbs the heat generated and is heated. The heated water then flows out from the outlet 12 of the heating element 1 and enters the contraction section 31 of the venturi tube 3. The flow rate of the hot water gradually increases in the contraction section 31. Upon entering the adsorption section 32, due to the special structure of the venturi tube, a certain negative pressure area is formed in the adsorption section 32.

[0039] When the instantaneous heater stops supplying water for a period of time and then restarts, some of the cold water flows normally into the heating element 1 for heating, while the other part is introduced directly from the inlet pipe 2 through the bypass pipe 4 into the adsorption section 32 of the venturi tube 3. Due to the negative pressure in the adsorption section 32, the cold water introduced through the bypass pipe 4 can smoothly enter and mix thoroughly with the high-temperature water coming out of the heating element 1 in the adsorption section 32. The mixed water then passes through the flared section 33, where the flow rate gradually decreases, and finally flows out from the outlet of the venturi tube 3 for use as hot water.

[0040] When an instantaneous heater stops supplying water and is restarted, conventional heaters can cause the residual water temperature to be too high due to the residual heat of the heating element, which can easily scald users when water is dispensed again. However, this heater, by incorporating a bypass pipe 4, introduces some cold water directly into the adsorption section 32 of the Venturi tube 3 to mix with the high-temperature water when water is refilled. This can quickly reduce the initial water temperature, greatly reducing the risk of scalding caused by temperature rise during water outages and improving safety during use.

[0041] In this application, the diameter of the bypass pipe 4 is smaller than the diameter of the adsorption section 32. When the instantaneous heater is refilled, the cold water is split into two paths: one flows into the heating element 1 through the inlet pipe 2 to be heated, and the other flows directly to the adsorption section 32 of the venturi tube 3 through the bypass pipe 4. Since the diameter of the bypass pipe 4 is smaller than that of the adsorption section 32, according to the principles of fluid mechanics, the pipe diameter will affect the flow velocity and pressure distribution of the fluid at a constant flow rate. The cold water in the bypass pipe 4 has a relatively fast flow velocity. When it enters the adsorption section with a larger diameter, the flow velocity will change, and a pressure difference and velocity difference will be generated between it and the high-temperature water from the heating element 1 in the adsorption section 32. This difference allows the cold water to enter the adsorption section 32 more smoothly and mix thoroughly with the high-temperature water in the adsorption section. The hot and cold water impact and merge with each other in the adsorption section 32, resulting in rapid heat transfer. The cold water absorbs the heat from the high-temperature water, causing its temperature to rise, while the high-temperature water releases heat and its temperature to drop, ultimately achieving effective mixing of hot and cold water.

[0042] If the diameter of bypass pipe 4 is too large, the insertion depth of bypass pipe 4 may need to be increased to allow cold water to enter adsorption section 32, which would lead to a significant increase in local flow resistance. The design of bypass pipe 4 having a smaller diameter than adsorption section 32 avoids the problem of increased insertion depth caused by an excessively large pipe diameter, reduces local flow resistance, and thus ensures a stable flow rate of cold water within bypass pipe 4. This stable bypass flow rate continuously provides sufficient cold water for the mixing process, ensuring an effective reduction in the initial outlet water temperature each time water is reintroduced.

[0043] The flow rate and pressure changes caused by the difference in pipe diameter make the mixing of cold water and hot water in the adsorption section more intense and thorough. After entering the adsorption section 32 at a higher flow rate, the cold water can quickly disperse into the hot water and exchange heat with the hot water in all directions. This avoids the situation where the cold water flows out without being fully mixed in some areas, further improving the mixing effect and making the initial outlet water temperature more uniform and stable, thus better solving the problem of temperature rise during water outages.

[0044] Please refer to Figure 1 The venturi tube 3 also includes an inlet flow stabilization section 34, which is a straight pipe with a uniform cross-section. Its inlet end is connected to the outlet 12, and its outlet end is connected to the inlet end of the contraction section 31.

[0045] After the heating element 1 heats the cold water, the hot water flows out from the outlet 12 of the heating element 1. At this time, the hot water may experience some turbulence due to factors such as the flow state inside the heating element and uneven heating, such as uneven velocity distribution and the presence of eddies. The inlet flow stabilization section 34 is a straight pipe with a constant cross-section, and its inlet end is connected to the outlet 12 of the heating element 1. After the hot water enters the inlet flow stabilization section 34, since the pipe cross-section remains unchanged, according to the principles of fluid mechanics, the velocity and pressure distribution of the fluid will gradually tend to stabilize when flowing in a straight pipe with a constant cross-section. During the flow of hot water in the inlet flow stabilization section 34, the originally turbulent water flow gradually becomes stable, and the velocity and pressure distribution becomes more uniform.

[0046] After being stabilized in the inlet flow stabilization section 34, the hot water flows out from its outlet and enters the contraction section 31 of the Venturi tube 3. The stable hot water flow can better adapt to the structural changes in the contraction section 31 of the Venturi tube 3, allowing the hot water to accelerate its flow within the contraction section 31 according to the expected pattern, thereby forming a stable negative pressure area in the adsorption section 32. This stable negative pressure is crucial for the thorough mixing of the cold water introduced by the bypass pipe 4 and the high-temperature hot water, ensuring that the cold and hot water mix in the adsorption section 32 in a suitable manner and at a suitable speed, thus improving the mixing effect.

[0047] It should be noted that the electric heating element 1 is equipped with a heat-conducting medium 5 and a heat exchange coil 6. One end of the heat exchange coil 6 is connected to the water inlet pipe through the water inlet 11, and the other end is connected to the inlet flow stabilizing section 34. The heat-conducting medium 5 covers the heat exchange coil 6 and is in contact with the outer wall of the heat exchange coil 6.

[0048] Specifically, cold water flows in from the inlet pipe 2 and enters the heat exchange coil 6 through the inlet 11. The heat exchange coil 6 is coiled in a specific shape within the heating element 1, providing a stable flow channel for the cold water. The cold water flows along a predetermined path within the heat exchange coil 6 and begins to be heated.

[0049] The heating element 1 is filled with a thermally conductive medium 5, which has high thermal conductivity. When the heating element 1 is energized, electrical energy is converted into heat energy, and the thermally conductive medium 5 absorbs this heat, causing its temperature to rise. The thermally conductive medium 5, which coats the outer wall of the heat exchange coil 6, transfers heat to the heat exchange coil 6 through thermal conduction. Because the thermally conductive medium 5 is in close contact with the outer wall of the heat exchange coil 6, heat can be efficiently transferred from the thermally conductive medium 5 to the cold water inside the heat exchange coil 6.

[0050] As the cold water flows within the heat exchange coil 6, it continuously absorbs heat transferred by the heat transfer medium 5, gradually increasing in temperature until it becomes hot water. The heated hot water enters the inlet stabilization section 34 and then flows out from the outlet 12. Subsequently, following the working principle of the venturi tube 3 described above, it mixes with the cold water introduced through the bypass pipe 4, ultimately outputting hot water at a suitable temperature.

[0051] Please refer to Figure 2 In a preferred embodiment, to achieve stable heating and efficient treatment of the fluid, the inlet flow stabilizing section 34 is disposed inside the heating element 1. Specifically, the outlet end of the heat exchange coil 6 is connected to the inlet end of the inlet flow stabilizing section 34, allowing the water after heat exchange through the heat exchange coil 6 to flow smoothly into the inlet flow stabilizing section 34. After the inlet flow stabilizing section 34 stabilizes the incoming hot water, its outlet end is connected to the inlet end of the contraction section 31 through the outlet 12, ensuring that the fluid enters the contraction section 31 in a stable and suitable state.

[0052] In another embodiment, the inlet flow stabilizing section 34 can be disposed outside the heating element 1, so that the inlet end of the inlet flow stabilizing section 34 is directly connected to the outlet 12 of the heating element 1. Since the inlet flow stabilizing section 34 is located outside the heating element 1, if the inlet flow stabilizing section 34 malfunctions during equipment operation, such as blockage or damage, maintenance personnel can more easily inspect, repair, or replace it without disassembling the heating element 1, greatly reducing maintenance difficulty and cost.

[0053] Specifically, the heat transfer medium 5 is a metal. Metals have extremely high thermal conductivity, far exceeding that of common non-metallic heat transfer materials. When the heating element 1 generates heat through electricity, the metal heat transfer medium 5 can rapidly absorb this heat and transfer it to the heat exchange coil 6 encased within it at an extremely fast speed. For example, the thermal conductivity of copper is approximately 401 W / (m·K), and that of aluminum is approximately 237 W / (m·K). Compared to some organic heat transfer materials (whose thermal conductivity is typically in the range of a few W / (m·K) or even lower), metals can achieve instantaneous heat conduction, allowing the cold water inside the heat exchange coil 6 to absorb sufficient heat in a shorter time, greatly improving heating efficiency.

[0054] Please refer to Figure 2 and Figure 3This application also includes an electric heating tube 7, which is disposed inside the electric heating body 1. Its heating part is covered or in close contact with the heat-conducting medium 5. The electrode 71 of the electric heating tube 7 extends out of the housing of the electric heating body 1 to connect to an external power source.

[0055] The heating element 7 typically contains a resistance wire. When an external power source is connected to the heating element 7 via electrode 71, current flows through the resistance wire. According to Joule's law, Q = I... 2 Rt (where Q is heat, I is current, R is resistance, and t is time), the resistance wire generates a large amount of heat. This heat is first transferred to the wall of the heating element 7. Since the heating part of the heating element 7 is covered or in close contact with the heat-conducting medium 5, the heat can be quickly and efficiently transferred from the heating element to the heat-conducting medium 5.

[0056] After the heat-conducting medium 5 absorbs the heat generated by the heating element 7, its temperature rises. As mentioned earlier, if the heat-conducting medium 5 is metal, its excellent thermal conductivity will further and rapidly diffuse the heat evenly throughout the entire area of ​​the heat-conducting medium 5. Subsequently, the heat-conducting medium 5 transfers the heat to the heat exchange coil 6 encasing it, causing the cold water inside the heat exchange coil 6 to absorb the heat and rise in temperature, eventually becoming hot water that flows out, completing the conversion process from electrical energy to thermal energy, and then from thermal energy to the internal energy of water.

[0057] It should be noted that the electrode 71 includes a positive electrode 711 and a negative electrode 712. The positive electrode 711 and the negative electrode 712 are configured to extend from the same side of the housing of the heating element 1, or to extend from different sides of the housing of the heating element 1 respectively.

[0058] When the positive and negative electrodes come out from the same side, the connection of the power cord is much simpler when installing the heater. Wiring only needs to be done in one location, eliminating the need to search for electrode interfaces on different sides of the heating element 1, reducing installation time and complexity, and making it especially suitable for applications with limited space and restricted installation locations.

[0059] The electrodes extending from the same side allow for a more concentrated arrangement of the power cables, making them easier to organize and secure, resulting in a neater and more aesthetically pleasing overall appearance of the heater. This also facilitates subsequent maintenance and repairs, as operations can be performed within a single area.

[0060] In addition, the Venturi tube 3 also includes an outlet flow stabilization section 35, which is a straight pipe with a uniform cross-section. Its inlet end is connected to the outlet end of the flared section 33, and its outlet end serves as the hot water outlet of the instantaneous heater.

[0061] The flared section 33 of the Venturi tube 3 gradually reduces the fluid velocity and may generate some turbulence. The outlet stabilizing section 35, being a straight pipe with a constant cross-section, maintains an unchanged internal flow channel cross-section. According to fluid mechanics principles, under steady flow conditions, the fluid velocity in a straight pipe with a constant cross-section tends to be uniform. This eliminates potential velocity inhomogeneities and turbulence at the outlet of the flared section 33, allowing hot water to flow out of the heater at a more stable velocity.

[0062] In actual use, the inlet water pressure of the instantaneous heater may fluctuate, which can cause changes in the velocity of the fluid within the Venturi tube 3. The outlet flow stabilization section 35 acts as a buffer and regulator, reducing the amplitude of velocity fluctuations and ensuring the stability of the hot water outlet flow rate, thus providing users with a more stable water flow experience.

[0063] The fluid direction at the outlet of the flared section 33 may be deflected to some extent due to the diffusion process. The outlet flow stabilization section 35 can guide the fluid to flow in a straight line, so that the hot water flows out of the heater in a predetermined direction, avoiding irregular changes in the water flow direction from affecting subsequent use, such as preventing water splashing or affecting the connection with other equipment.

[0064] Eddies can lead to fluid energy loss and flow instability. The presence of the outlet flow stabilization section 35 can suppress the generation and development of eddies, allowing the fluid to maintain a more regular flow state at the outlet and improving the fluid flow efficiency.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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 instantaneous heater, characterized in that, Includes heating element, inlet pipe, venturi tube and bypass pipe; The heating element has a water inlet and a water outlet; The water inlet pipe is connected to the water inlet; The Venturi tube includes a constriction section, an adsorption section and a flaring section connected in sequence, and the constriction section is connected to the outlet. One end of the bypass pipe is connected to the water inlet pipe, and the other end is connected to the adsorption section.

2. The instantaneous heater according to claim 1, characterized in that, The diameter of the bypass pipe is smaller than the diameter of the adsorption section.

3. The instantaneous heater according to claim 1, characterized in that, The venturi tube also includes an inlet flow stabilization section, which is a straight pipe with a uniform cross-section. Its inlet end is connected to the outlet, and its outlet end is connected to the inlet end of the contraction section.

4. The instantaneous heater according to claim 3, characterized in that, The electric heating element is provided with a heat-conducting medium and a heat exchange coil. One end of the heat exchange coil is connected to the water inlet pipe through the water inlet, and the other end is connected to the inlet flow stabilization section. The heat-conducting medium covers the heat exchange coil and is in contact with the outer wall of the heat exchange coil.

5. The instantaneous heater according to claim 4, characterized in that, The heat-conducting medium is metal.

6. The instantaneous heater according to claim 4, characterized in that, It also includes an electric heating element, which is disposed in the heating body. Its heating part is covered or in close contact with the heat-conducting medium, and the electrodes of the electric heating element protrude out of the housing of the heating body to be connected to an external power source.

7. The instantaneous heater according to claim 6, characterized in that, The electrode includes a positive electrode and a negative electrode, which are configured to extend from the same side of the housing of the heating element or from different sides of the housing of the heating element.

8. The instantaneous heater according to claim 1, characterized in that, The Venturi tube also includes an outlet flow stabilization section, which is a straight pipe with a uniform cross-section. Its inlet end is connected to the outlet end of the flared section, and its outlet end serves as the hot water outlet of the instantaneous heater.

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