An instant water heater that prevents excessive temperature rise due to residual heat

Abstract

This invention belongs to the field of water heater technology and discloses an instant water heater that prevents excessive temperature rise due to residual heat. It includes a heating element, an inlet pipe and an outlet pipe connecting the heating element, and a bypass pipe connecting the inlet and outlet pipes. The bypass pipe is configured to deliver cold water to the outlet pipe to mix with the water heated by the residual heat of the heating element. After the heating element stops heating, the water inside the heating element is heated by residual heat. When the heating element is turned on again, the temperature of the water heated by the residual heat is higher than the user-set temperature. At this time, cold water is delivered to the outlet pipe through the bypass pipe and mixed with the water heated by the residual heat of the heating element, thereby lowering the temperature of the hot water before it flows out through the outlet pipe. The water flowing out of the outlet pipe will not scald the user and there is no waste of water resources. Furthermore, it can prevent the instant water heater from overheating due to residual heat, which could lead to aging of the heating element and other adverse conditions.

Description

Technical Field

[0001] This invention relates to the field of water heater technology, and in particular to an instant water heater that prevents excessive temperature rise due to residual heat. Background Technology

[0002] Instantaneous water heaters, also known as rapid or quick-heating water heaters, are characterized by: cold water inlet and hot water outlet. Simply open the outlet valve to provide a continuous supply of hot water in a short time. When hot water is not needed, closing the outlet valve shuts off the water supply and stops heating quickly. Electric instantaneous water heaters, in particular, use a high-power electric heater (such as a heating element) to rapidly heat the cold water flowing through the heating zone, quickly reaching the predetermined operating temperature, thus achieving the goal of cold water inlet and hot water outlet.

[0003] When using a water heater, users may experience situations where it is turned off and then on again. Before the water outlet valve is closed, the electric heater has already heated some water. This water remains at the electric heater after the outlet valve is closed. Since the electric heater itself has residual heat, it will reheat this water, causing its temperature to rise. When the user opens the water outlet valve again, there is a possibility that the water temperature will be too high and scald the user.

[0004] To address the aforementioned issues, existing electric instant water heaters typically employ software-controlled delayed heating or the addition of a mixing valve at the outlet to reduce residual heat temperature rise. The former affects the temperature stability, degrades the user experience, and has limited effectiveness in reducing residual heat temperature rise. The latter increases costs and presents operational difficulties, and the water temperature often fluctuates, making it easy for users to accidentally adjust the mixing valve to the high-temperature setting, potentially causing burns. Summary of the Invention

[0005] The purpose of this invention is to provide an instant water heater that prevents excessive heat rise due to residual heat, thereby reducing the temperature rise of residual heat in real time and avoiding scalding of users.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An instant water heater designed to prevent excessive heat rise due to waste heat includes a heating element, an inlet pipe and an outlet pipe connecting the heating element, and a bypass pipe connecting the inlet pipe and the outlet pipe, the bypass pipe being configured to deliver cold water to the outlet pipe for mixing with water heated by the waste heat of the heating element.

[0008] Preferably, the bypass pipe includes a first end that connects to the outlet pipe, and the first end extends into the outlet pipe.

[0009] Preferably, the first end extends to the end of the water outlet pipe that is connected to the heating component, so that the water flowing out of the first end and the water flowing into the water outlet pipe from the heating component are in a convective state.

[0010] Preferably, the port at the first end is angled toward the wall of the water outlet pipe.

[0011] Preferably, the angle α between the axis of the port at the first end and the axis of the portion of the bypass pipe located outside the outlet pipe is 30°-60°.

[0012] Preferably, the bypass pipe includes a second end connected to the inlet pipe, the second end extending into the inlet pipe and passing over the axis of the inlet pipe.

[0013] Preferably, the diameter of the second end is smaller than the diameter of the water inlet pipe.

[0014] Preferably, the bypass pipe is sealed to the inlet pipe and to the outlet pipe by a sealing ring.

[0015] Preferably, the bypass pipe is provided with fixing blocks at both ends, and the sealing ring is fixed to the connection between the bypass pipe and the inlet pipe and the connection between the bypass pipe and the outlet pipe by the fixing blocks.

[0016] Preferably, the bypass pipe is equipped with a flow regulating valve.

[0017] The beneficial effects of this invention are as follows: By setting a bypass pipe, when the heating element stops heating, the water inside the heating element is heated by residual heat. When the heating element is turned on again, the temperature of the water heated by the residual heat is higher than the user-set temperature. At this time, cold water is supplied to the outlet pipe through the bypass pipe and mixed with the water heated by the residual heat of the heating element, thereby reducing the temperature of the high-temperature water heated by the residual heat of the heating element before it flows out through the outlet pipe. The water flowing out of the outlet pipe at this time will not scald the user and there is no waste of water resources. Furthermore, it can prevent the residual heat of the instantaneous water heater from rising too high, which could lead to aging of the heating element and other malfunctions. Attached Figure Description

[0018] Figure 1 This is a front view of the instant water heater provided by the present invention to prevent excessive temperature rise due to residual heat.

[0019] Figure 2 This is a front view of the bypass pipe provided by the present invention;

[0020] Figure 3 This is a top view of the bypass pipe provided by the present invention;

[0021] Figure 4 This is an assembly diagram of the bypass pipe and the water inlet pipe provided by the present invention.

[0022] In the picture:

[0023] 1. Heating component; 2. Inlet pipe; 3. Outlet pipe; 4. Bypass pipe; 41. First end; 42. Second end; 5. Sealing ring; 6. Fixing block. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0025] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed 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 invention based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly 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 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 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.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0028] This invention provides an instant water heater that prevents excessive heat rise due to residual heat, thus avoiding scalding of users and eliminating water waste. Figure 1As shown, this instant water heater, designed to prevent excessive heat rise due to residual heat, includes a heating element 1, an inlet pipe 2 and an outlet pipe 3 connecting the heating element 1, and a bypass pipe 4 connecting the inlet pipe 2 and the outlet pipe 3. Cold water enters the heating element 1 through the inlet pipe 2, is heated, and then flows out through the outlet pipe 3 for user use. The bypass pipe 4 is configured to deliver cold water to the outlet pipe 3 to mix with the water heated by the residual heat of the heating element 1. Specifically, when the user temporarily stops using water, the heating element 1 is turned off. The heating element 1 stores water heated to the user's set temperature. This water heated to the user's set temperature is then reheated by the residual heat of the heating element 1, raising its temperature above the user's set temperature. When the user uses water again, some of the cold water flows into the outlet pipe 3 through the bypass pipe 4 and mixes with the water heated by the residual heat of the heating element 1, thus lowering the temperature of the high-temperature water heated by the residual heat of the heating element 1 before it flows out through the outlet pipe 3. At this time, the water flowing from outlet pipe 3 will not scald the user, nor will it waste water resources. Furthermore, it can prevent the instant water heater from overheating due to residual heat, which could lead to aging of the heating element 1 and other malfunctions.

[0029] As a preferred technical solution, the bypass pipe 4 includes a first end 41 connected to the outlet pipe 3 and a second end 42 connected to the inlet pipe 2, wherein:

[0030] The first end 41 is inserted into the water outlet pipe 3, meaning that the first end 41 will enter the water outlet pipe 3 so that the cold water in the bypass pipe 4 can smoothly enter the water outlet pipe 3 to mix with the hot water in the water outlet pipe 3.

[0031] More preferably, the first end 41 extends towards the end of the outlet pipe 3 that connects to the heating component 1, so that the water flowing out of the first end 41 and the water flowing into the outlet pipe 3 from the heating component 1 are in a convective state. This structural arrangement allows the water flowing out of the first end 41 and the water flowing into the outlet pipe 3 from the heating component 1 to be in a convective state, enabling the cold water to mix thoroughly with the hot water heated by waste heat, thus improving the cooling effect of the hot water. Specifically, refer to... Figure 2 and Figure 3 The first end 41 is configured with a bent structure, including a first section that is sealed and extends into the water outlet pipe 3 and extends radially along the water outlet pipe 3, and a second section that is perpendicular to the first section. The outlet of the second section points towards the heating component 1, so that the water flowing out of the first end 41 and the water flowing into the water outlet pipe 3 from the heating component 1 are in a convection state.

[0032] In this embodiment, the port of the first end 41 (that is, the outlet of the second section) is inclined towards the wall of the outlet pipe 3. This structure allows the cold water in the bypass pipe 4 to flow towards the wall of the outlet pipe 3 and to flow in a reverse spiral along the inner wall of the outlet pipe 3. This allows for a longer contact time with the hot water flowing into the outlet pipe 3 from the heating component 1, resulting in a better cooling effect. Preferably, the angle α between the axis of the port of the first end 41 (which can be understood as the axis of the second section) and the axis of the portion of the bypass pipe 4 located outside the outlet pipe 3 is 30°-60°. This angle allows the cold water in the bypass pipe 4 to flow in a reverse spiral along the inner wall of the outlet pipe 3.

[0033] like Figure 4 As shown, the second end 42 of the bypass pipe 4 extends into the inlet pipe 2 and crosses its axis. By having the second end 42 cross the axis of the inlet pipe 2, the cross-sectional area of ​​the inlet pipe 2 can be reduced, thus lowering the water flow velocity through the heating component 1 within the inlet pipe 2. With the total flow rate remaining constant, the flow velocity of the bypass pipe 4 is relatively increased, i.e., the percentage of water entering the bypass pipe 4 is increased. The total water volume within the heating component 1 does not decrease, meaning the water volume absorbing heat from the heating component 1 remains unchanged. Only the water flow velocity decreases, reducing the heat dissipated into the surrounding space and improving thermal efficiency. Preferably, the diameter of the second end 42 is smaller than the diameter of the inlet pipe 2. This allows the second end 42 to extend into the inlet pipe 2 without completely blocking it, allowing cold water to enter the heating component 1.

[0034] In this embodiment, the bypass pipe 4 and the inlet pipe 2, as well as the bypass pipe 4 and the outlet pipe 3, are sealed together by sealing rings 5. Specifically, refer to... Figure 2 Fixing blocks 6 are provided at both ends of the bypass pipe 4. The sealing ring 5 is fixed to the connection between the bypass pipe 4 and the inlet pipe 2 and the connection between the bypass pipe 4 and the outlet pipe 3 through the fixing blocks 6. Specifically, the fixing blocks 6 can be fixed to the inlet pipe 2 or the outlet pipe 3 to press and seal the sealing ring 5 at the connection between the bypass pipe 4 and the inlet pipe 2 and the connection between the bypass pipe 4 and the outlet pipe 3.

[0035] In this embodiment, the bypass pipe 4 can be a capillary tube. By setting the internal diameter of the bypass pipe 4, the cold water flow rate can be adjusted to suit different models of instant water heaters. Alternatively, a flow regulating valve can be directly installed on the bypass pipe 4 to regulate the flow rate of cold water in the bypass pipe 4, thus accommodating different models of instant water heaters.

[0036] The instant water heater described above in this embodiment, which prevents excessive heat rise due to residual heat, can neutralize the temperature of the water heated by the residual heat of the heating component 1, thereby ensuring that the water flowing out of the outlet pipe 3 will not scald the user and will not result in a waste of water resources.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An instantaneous water heater preventing excessive residual heat temperature rise, characterized by, The heating assembly (1), the water inlet pipe (2) and the water outlet pipe (3) connected with the heating assembly (1), and the bypass pipe (4) connected with the water inlet pipe (2) and the water outlet pipe (3), the bypass pipe (4) is configured to transport cold water to the water outlet pipe (3) to mix with the water heated by the heating assembly (1) and the residual heat; The bypass pipe (4) comprises a first end (41) connected with the water outlet pipe (3), and the first end (41) extends into the water outlet pipe (3); The first end (41) extends to the end of the heating assembly (1) connected with the water outlet pipe (3), so that the water flowing out of the first end (41) is in a counterflow state with the water flowing into the water outlet pipe (3) from the heating assembly (1); The port of the first end (41) is inclined to the pipe wall of the water outlet pipe (3), which can make the cold water in the bypass pipe (4) flow to the pipe wall of the water outlet pipe (3) and present a reverse spiral flow state along the inner wall of the water outlet pipe (3); The bypass pipe (4) comprises a second end (42) connected with the water inlet pipe (2), and the second end (42) extends into the water inlet pipe (2) and is arranged beyond the axis of the water inlet pipe (2).

2. The instant water heater for preventing excessive residual temperature rise according to claim 1, wherein The angle α between the axis of the port of the first end (41) and the axis of the part of the bypass pipe (4) located outside the water outlet pipe (3) is 30°-60°.

3. The instant water heater of claim 1, wherein the temperature sensor is a thermistor. The diameter of the second end (42) is smaller than the diameter of the water inlet pipe (2).

4. The instant water heater that prevents excessive residual heat temperature rise according to claim 1, wherein The bypass pipe (4) and the water inlet pipe (2) are sealed and connected by a sealing ring (5), and the bypass pipe (4) and the water outlet pipe (3) are also sealed and connected by the sealing ring (5).

5. The instant water heater of claim 4, wherein the temperature sensor is a thermistor. Both ends of the bypass pipe (4) are provided with fixing blocks (6), and the sealing ring (5) is fixed at the connection between the bypass pipe (4) and the water inlet pipe (2) and the connection between the bypass pipe (4) and the water outlet pipe (3) through the fixing blocks (6).

6. The instantaneous water heater that prevents excessive residual heat temperature rise according to claim 1, wherein The bypass pipe (4) is provided with a flow regulating valve.

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