A waterproof instant heating device

Abstract

The application discloses a waterproof instant heating device, which comprises a shell, a heating tube and a temperature control tube. The heating tube and the temperature control tube are arranged in a heating cavity of the shell. The temperature control tube is provided with a waterproof cavity. A temperature control unit is arranged in the waterproof cavity. The temperature control tube separates water in the heating cavity from the outside of the waterproof cavity. The shell is provided with a water inlet, a water outlet, a wiring port and a lead port. An end of the heating tube provided with a terminal extends out of the wiring port. A wire connected with the temperature control unit extends out of the lead port. The temperature control unit is arranged in the waterproof cavity, so that the temperature control electronic element is physically separated from the water channel. The temperature control unit can closely monitor the water temperature in the heating cavity, the real-time performance and the accuracy of temperature feedback are improved, and the instant heating device can be arranged in a hot water tank of a water purifier to work. Heat is transferred from hot water in the hot water tank to the instant heating device. The water in the instant heating device is in a constant heating state, the preheating waiting time is effectively shortened, and the set temperature can be quickly reached at an initial stage of water outlet.

Description

Technical Field

[0001] This application relates to the field of instant heating devices, specifically to a waterproof instant heating device. Background Technology

[0002] An instant water heater (also known as an instant heating module) is a device that can quickly heat water to a set temperature, allowing users to obtain hot water directly after a short wait. Instant water heaters are a common feature in modern water purifiers, and are especially suitable for scenarios requiring instant hot water (such as making tea, formula, coffee, etc.).

[0003] For reasons such as safety protection, precise temperature control, improved energy efficiency, and extended service life, instant heating devices are equipped with temperature control units (such as self-resetting thermostats, non-self-resetting thermostats, etc.). In existing solutions, to facilitate the connection between the temperature control unit and the controller wires, the temperature control unit is generally installed on the outside of the device casing, resulting in the instant heating device being installed and used only in the air. This type of instant heating device also has some drawbacks: due to the influence of the external atmospheric environment and the isolation of the device casing, the temperature control unit has a slightly larger deviation in monitoring and feedback of the water temperature inside the heating chamber, resulting in insufficient real-time performance and accuracy; the temperature control unit protrudes from the outside of the device casing, making the instant heating device bulky and occupying a large installation space; because the temperature control unit is located outside the device, it needs to be kept as far away as possible from the water circuit structure to avoid water leakage that could damage the electronic components of the temperature control unit during power-on, thus limiting the installation location of the instant heating device within the water purifier. Utility Model Content

[0004] This application provides a waterproof instant heating device to improve or solve, to some extent, the technical problems of insufficient real-time performance and accuracy of temperature control unit monitoring and feedback, large space occupation and limited installation location of the temperature control unit in existing instant heating devices.

[0005] The technical solution adopted in this application is as follows:

[0006] A waterproof instant heating device includes a housing, a heating element, and a temperature control element. The heating element and the temperature control element are disposed within the heating cavity of the housing. The temperature control element has a waterproof cavity, and a temperature control unit is disposed within the waterproof cavity. The temperature control element isolates water in the heating cavity from the outside of the waterproof cavity. The housing has a water inlet, a water outlet, a wiring port, and a lead wire port. The end of the heating element with a wiring terminal extends from the wiring port, and the wire connected to the temperature control unit passes through the lead wire port.

[0007] In this technical solution, by embedding the temperature control unit within a waterproof cavity, physical isolation between the temperature control electronic components and the water circuit is achieved, improving upon the traditional external temperature control unit design of instant heating devices. This structure not only allows the temperature control unit to monitor the water temperature inside the heating cavity at close range, significantly improving the real-time performance and accuracy of temperature feedback, but also achieves a compact design while ensuring electrical safety through the layout of external heating element terminals and wires passing through the lead-in port. This avoids the risk of electrical short circuits caused by water leakage, simplifies the overall structure, and reduces installation space requirements. Furthermore, by embedding the temperature control unit within the waterproof cavity, the installation location restrictions of the instant heating device are reduced. Taking its application in a water purifier as an example, it allows most of the instant heating device to operate within hot water. Specifically, the instant heating device can be placed inside the hot water tank of the water purifier, where the hot water in the tank transfers heat to the device. The water inside the device remains at a constant temperature, effectively shortening the preheating waiting time and allowing the set temperature to be quickly reached in the initial stage of water output.

[0008] The heating element is provided with a water-proof flange, which connects to the outer shell and divides the heating chamber into a water inlet chamber and a water outlet chamber. The water inlet is connected to the water inlet chamber, and the water outlet is connected to the water outlet chamber. The water-proof flange is provided with a water passage hole that connects the water inlet chamber and the water outlet chamber.

[0009] In this technical solution, the water-proof flange divides the heating chamber into an inlet chamber and an outlet chamber. This chamber design creates a dual-chamber water flow path. Water heated in the inlet chamber enters the outlet chamber under the turbulence of the water-proof flange, where it is thoroughly mixed, resulting in a more uniform and precise outlet water temperature. The physical separation between the inlet and outlet chambers, combined with the water passage guiding the water flow, generates a laminar flow heating effect. After initial heating in the inlet chamber, the water enters the outlet chamber for further heating, extending the contact time between the water and the heating element and improving thermal energy utilization. Furthermore, the water-proof flange simultaneously serves as a seal and support, enhancing structural stability.

[0010] The water-proof flange is provided with a plurality of water passage holes, and the cross-sectional area of ​​the water inlet and the cross-sectional area of ​​the water outlet are both less than or equal to the sum of the cross-sectional areas of the plurality of water passage holes.

[0011] In this technical solution, the optimal balance between flow rate and pressure drop is achieved through the fluid dynamics design with cross-sectional area matching, ensuring that the water passage will not become a flow velocity bottleneck when there is a high flow rate requirement, and maintaining the pressure balance between the inlet and outlet chambers.

[0012] The outer casing includes a cylindrical body and a top cover and a bottom cover that respectively cover the upper and lower ends of the cylindrical body. The water-proof flange is located between the top cover and the cylindrical body. The top cover is connected to the water-proof flange and seals the water outlet cavity. The cylindrical body is connected to the water-proof flange and seals the water inlet cavity. The water inlet is located on the bottom cover, and the water outlet is located on the top cover.

[0013] In this technical solution, a split shell structure is adopted, including a cylinder, a top cover and a bottom cover, which are combined with a water-proof flange to achieve modular assembly, which facilitates production and subsequent maintenance. The top cover and the cylinder respectively seal the water outlet chamber and the water inlet chamber, further enhancing the sealing reliability. In addition, the cooperation between the top cover and the water-proof flange, as well as the cooperation between the cylinder and the water-proof flange, forms a double sealing interface, improving the overall sealing performance.

[0014] The cylinder has smooth inner and outer surfaces and uniform wall thickness; or, the cylinder wall is provided with multiple protrusions protruding into the heating cavity.

[0015] In this technical solution, the smooth and uniformly thick cylinder can reduce processing costs and improve pressure resistance, while the boss design can increase the strength of the outer shell structure. At the same time, it can disturb the water flow to form a turbulence effect, which enhances the heat exchange efficiency. Moreover, the presence of the boss reduces the volume of the internal space of the cylinder, thereby reducing the maximum water capacity that the cylinder can hold and improving the efficiency of the heating element in heating water.

[0016] The heating element comprises two symmetrical heating tube segments, and the temperature control tube is located between the two heating tube segments.

[0017] In this technical solution, the symmetrical layout of the dual heating tubes generates a synergistic heating effect, forming a surrounding heating field, eliminating the cold zone phenomenon of the single tube structure, making the distance between the water and the heating tube more uniform throughout the shell, and making the heating tube heat the water more uniformly, thereby improving the heating efficiency; the clamping layout of the temperature control tube in the center of the dual heating tubes optimizes the space utilization.

[0018] The two heating tube segments are connected by an arc-shaped transition section to form a U-shaped structure, and the temperature control tube is integrally connected to the arc-shaped transition section.

[0019] In this technical solution, the integrated connection between the U-shaped heating element and the temperature control element facilitates overall assembly, improves assembly efficiency, and reduces the risk of leakage; the arc-shaped transition section can guide the water flow to change direction smoothly, reducing flow resistance and noise.

[0020] One end of the temperature control tube is a closed end and the other end is an open end. The closed end is connected to the arc-shaped transition section. The position of the lead-in port corresponds to the open end. The temperature control unit is inserted into the waterproof cavity or taken out of the waterproof cavity through the lead-in port.

[0021] In this technical solution, the temperature control tube is designed with a lead-in port. The lead-in port is not only used for wires to pass through, but also allows the temperature control unit to be easily disassembled and replaced without damaging the overall sealing structure. The temperature control unit can be inspected and repaired through the lead-in port while the instant heating device is in a fully assembled state, which greatly reduces maintenance costs. Aligning the open end with the lead-in port also facilitates the installation of the sealing structure.

[0022] The two heating tube segments are connected to the temperature control tube via a sealing flange. A sealing body is provided between the sealing flange and the outer casing. The sealing body seals the gap between the heating tube and the wiring port and forms a seal between the lead-in port and the open end.

[0023] In this technical solution, the sealing flange clamps the sealing body to the outer shell. By utilizing the elastic deformation of the sealing body, the sealing gap between the heating element and the wiring port, as well as the sealing between the lead-in port and the open end, are ensured, reducing the risk of water leakage and seepage into the temperature control pipe.

[0024] The heating chamber is equipped with a water inlet baffle for shaping the water entering through the inlet, and the edge of the water inlet baffle forms a circumferentially extending water passage gap with the outer shell.

[0025] In this technical solution, when water enters the outer casing through the inlet, it flows along the circumferential water passage gap under the obstruction of the water inlet baffle, thereby enabling it to be more evenly distributed inside the outer casing, improving the heating uniformity of the heating element, and making the water heat up evenly.

[0026] Due to the adoption of the above technical solution, the technical effects achieved by this application are as follows: By embedding the temperature control unit within the waterproof cavity, physical isolation between the temperature control electronic components and the water circuit is realized, improving upon the traditional solution of externally mounted temperature control units in instant heating devices. This structure not only allows the temperature control unit to monitor the water temperature inside the heating cavity at close range, significantly improving the real-time performance and accuracy of temperature feedback, but also achieves a compact design while ensuring electrical safety through the layout of external heating tube terminals and wires passing through the lead-in port, avoiding the risk of electrical short circuits caused by water leakage, simplifying the overall structure, and reducing installation space requirements. Furthermore, by embedding the temperature control unit within the waterproof cavity, the installation location restrictions of the instant heating device are reduced. Taking its application in a water purifier as an example, it allows most of the instant heating device to operate within hot water. Specifically, the instant heating device can be installed inside the hot water tank of the water purifier, transferring heat to the instant heating device through the hot water in the tank. The water inside the instant heating device is kept at a constant temperature, effectively shortening the preheating waiting time and allowing the set temperature to be quickly reached in the initial stage of water output. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 This is an assembly diagram of the waterproof instant heating device provided in the first embodiment of this application;

[0029] Figure 2 Cross-sectional view of the waterproof instant heating device provided in the first embodiment of this application. Figure 1 ;

[0030] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 Cross-sectional view of the waterproof instant heating device provided in the first embodiment of this application. Figure 2 ;

[0032] Figure 5 This is an assembly drawing of the heating element, temperature control element, water-proof flange, and sealing flange provided in the first embodiment of this application;

[0033] Figure 6 This is a schematic diagram of the structure of the sealing body provided in the first embodiment of this application;

[0034] Figure 7 This is a schematic diagram of the structure of the cylinder provided in the second embodiment of this application;

[0035] Figure 8 This is a schematic diagram of the structure of the cylinder provided in the third embodiment of this application.

[0036] List of components and reference numerals:

[0037] 1 Outer shell, 11 Inlet chamber, 12 Outlet chamber, 13 Cylinder, 131 Boss, 14 Top cover, 141 Outlet, 142 Wiring port, 143 Lead wire port, 15 Bottom cover, 151 Inlet;

[0038] 2 heating element, 21 heating element segment, 22 arc-shaped transition segment;

[0039] 3. Temperature control tube, 31. Closed end, 32. Open end;

[0040] 4 temperature control units;

[0041] 5 terminal blocks;

[0042] 6. Waterproof flange, 61. Water passage hole;

[0043] 7. Sealing flange;

[0044] 8 sealing body, 81 intermediate clearance hole, 82 wiring clearance hole;

[0045] 9. Inlet baffle plate;

[0046] 10. Sealing gasket. Detailed Implementation

[0047] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0048] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0049] Furthermore, it should be understood in the description of this application that the terms "upper," "lower," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "lateral," and "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a communication 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.

[0051] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an 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. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0052] In the embodiments of this application, a waterproof instant heating device is provided. For ease of explanation and understanding, the following content provided in this application is based on the illustrated product structure. Of course, those skilled in the art will understand that the above structure is only a specific example and illustrative illustration, and does not constitute a specific limitation on the technical solution provided in this application.

[0053] Reference Figures 1 to 8As shown, the waterproof instant heating device provided in this application includes a housing 1, a heating element 2, and a temperature control element 3. The heating element 2 and the temperature control element 3 are disposed in the heating cavity of the housing 1. The temperature control element 3 is provided with a waterproof cavity, and a temperature control unit 4 is disposed in the waterproof cavity. The temperature control element 3 isolates the water in the heating cavity from the outside of the waterproof cavity. The housing 1 is provided with a water inlet 151, a water outlet 141, a wiring port 142, and a lead wire port 143. The end of the heating element 2 with a wiring terminal 5 extends out from the wiring port 142, and the wire connected to the temperature control unit passes out from the lead wire port 143.

[0054] In this technical solution, the heating chamber is used for water intake. When the heating element 2 is energized, it heats the water inside the heating chamber. The temperature control unit 4 measures the water temperature inside the heating chamber and controls the instant heating device according to the set temperature value to achieve temperature regulation. In a preferred embodiment, the temperature control unit 4 may include a self-resetting thermostat and a non-self-resetting thermostat, providing dual protection for the device and improving the system's safety and reliability. When the waterproof instant heating device is working, water enters the heating chamber through the inlet 151, the heating element 2 is energized to heat the water to the set temperature, and the hot water is discharged from the outlet 141.

[0055] By embedding the temperature control unit 4 within the waterproof cavity, physical isolation between the temperature control electronic components and the water circuit is achieved, improving upon the traditional external temperature control unit design of instant heating devices. This structure not only allows the temperature control unit 4 to monitor the water temperature inside the heating cavity at close range, significantly improving the real-time performance and accuracy of temperature feedback, but also achieves a compact design while ensuring electrical safety through the layout of external heating tube 2 wiring terminal 5 at connection port 142 and wires passing through lead-in port 143. This avoids the risk of electrical short circuits caused by water leakage, simplifies the overall structure, and reduces installation space requirements. Furthermore, by integrating the temperature control unit 4 into the waterproof cavity, the installation location restrictions of the instant heating device are reduced. Taking its application in a water purifier as an example, the instant heating device can operate within hot water. Specifically, most of the instant heating device can be installed inside the hot water tank of the water purifier, while the portion of the outer casing 1 with the wiring port 142 and lead wire port 143 can remain outside the hot water tank to improve safety. Heat is transferred to the instant heating device through the hot water in the hot water tank, preventing the water inside the instant heating device from cooling down to room temperature due to heat exchange with the outside atmosphere. The water inside the instant heating device remains at a constant temperature, effectively shortening the preheating waiting time and allowing the set temperature to be quickly reached in the initial stage of water output. In addition, the direct integration of the instant heating device into the hot water tank achieves a physical fusion of heat storage and instant heating functions, effectively reducing the space occupied by traditional split-type heat storage and instant heating systems. It also helps to shorten the water supply path from the hot water tank to the instant heating device, simplifying the water circuit structure and improving the water supply and heating speed.

[0056] In a preferred embodiment, the outer casing 1 can be made of stainless steel, which balances strength and thermal conductivity. In another preferred embodiment, the water inlet 151 can be located at the bottom of the outer casing 1, and the water outlet 141 can be located at the top of the outer casing 1. The water inlet 151 and the water outlet 141 are located at the two ends of the outer casing 1, which helps to extend the flow path of water in the heating chamber and allows the heating element 2 to fully heat the water.

[0057] As a preferred embodiment of this application, such as Figure 2 , Figure 3 and Figure 5 As shown, the heating element 2 is equipped with a water-proof flange 6, which connects to the outer shell 1 and divides the heating chamber into an inlet chamber 11 and an outlet chamber 12. An inlet 151 connects to the inlet chamber 11, and an outlet 141 connects to the outlet chamber 12. The water-proof flange 6 has a water passage 61 connecting the inlet chamber 11 and the outlet chamber 12. Specifically, the water-proof flange 6 and the heating element 2 can be welded together. The heating element 2 passes through both the inlet chamber 11 and the outlet chamber 12. Preferably, the volume of the inlet chamber 11 is larger than the volume of the outlet chamber 12, and most of the heating element 2 is located within the inlet chamber 11, with a small portion located within the outlet chamber 12, so that the water can be fully heated within the inlet chamber 11. In this technical solution, the water-proof flange 6 divides the heating chamber into an inlet chamber 11 and an outlet chamber 12. This chamber design creates a dual-chamber water flow path. Water heated in the inlet chamber 11 enters the outlet chamber 12 under the turbulence effect of the water-proof flange 6, where it is thoroughly mixed, resulting in a more uniform and precise outlet water temperature. The physical separation between the inlet chamber 11 and the outlet chamber 12, combined with the water passage 61 guiding the water flow, generates a laminar flow heating effect. After initial heating in the inlet chamber 11, the water enters the outlet chamber 12 for further heating, extending the contact time between the water flow and the heating element 2 and improving thermal energy utilization. Furthermore, the water-proof flange 6 simultaneously serves as a seal and support, enhancing structural stability.

[0058] In a preferred embodiment, the water-proof flange 6 is provided with multiple water passage holes 61. The cross-sectional areas of the inlet 151 and the outlet 141 are both less than or equal to the sum of the cross-sectional areas of the multiple water passage holes 61. Specifically, the multiple water passage holes 61 can be evenly distributed around the heating tube 2, so that the water surrounding the heating tube 2 in the inlet chamber 11 can enter the outlet chamber 12 evenly. In addition, the sum of the cross-sectional areas of the multiple water passage holes 61 is greater than the cross-sectional area of ​​the inlet 151 and also greater than the cross-sectional area of ​​the outlet 141. Through the fluid dynamics design of cross-sectional area matching, the optimal balance of flow rate and pressure drop is achieved, ensuring that the water passage holes 61 will not become a flow velocity bottleneck when there is a high flow rate demand. In other words, when there is a large flow rate demand for hot water, the flow of water from the inlet chamber 11 to the outlet chamber 12 will not be restricted due to the small cross-sectional area of ​​the water passage holes 61, thus maintaining the pressure balance between the inlet chamber 11 and the outlet chamber 12.

[0059] In a preferred embodiment, such as Figure 2 , Figure 3 , Figure 4 and Figure 6 As shown, the outer shell 1 includes a cylindrical body 13 and a top cover 14 and a bottom cover 15 that respectively cover the upper and lower ends of the cylindrical body 13. A water-proof flange 6 is located between the top cover 14 and the cylindrical body 13. The top cover 14 is connected to the water-proof flange 6 and seals the water outlet chamber 12. The cylindrical body 13 is connected to the water-proof flange 6 and seals the water inlet chamber 11. The water inlet 151 is located on the bottom cover 15, and the water outlet 141 is located on the top cover 14. In this technical solution, a split-type outer shell 1 structure is adopted, including a cylindrical body 13, a top cover 14, and a bottom cover 15. Modular assembly is achieved with the water-proof flange 6, which facilitates manufacturing and subsequent maintenance. The top cover 14 and the cylindrical body 13 respectively seal the water outlet chamber 12 and the water inlet chamber 11, further enhancing the sealing reliability. In addition, the cooperation between the top cover 14 and the water-proof flange 6, as well as the cooperation between the cylindrical body 13 and the water-proof flange 6, forms a double sealing interface, improving the overall sealing performance. More preferably, the bottom cover 15 can be welded to the cylinder 13 to ensure the bottom sealing of the heating chamber, and the cylinder 13 can also be welded to the water-proof flange 6 to ensure the top sealing of the water inlet chamber 11. The top cover 14 and the water-proof flange 6 can be connected by welding. To facilitate the installation of a sealing structure between the top cover 14 and the water-proof flange 6, the top cover 14 and the water-proof flange 6 can also be detachably connected by bolts, such as... Figure 3 As shown, the top cover 14 and the water-proof flange 6 are equipped with sealing gaskets 10, which circumferentially seal the water outlet chamber 12. Furthermore, connection holes can be provided on the top cover 14, the water-proof flange 6, and the sealing gasket 10 to facilitate the passage of bolts and their engagement with nuts. Additionally, a wiring port 142 can be located on the top cover 14, and the wiring terminal 5 of the heating element 2 can extend from the top cover 14 and be electrically connected to the power supply structure.

[0060] Regarding the structure of the cylinder 13, in a preferred embodiment, as follows: Figure 1 As shown, the cylinder 13 has smooth inner and outer surfaces and a uniform wall thickness, forming a smooth, uniformly thick cylinder 13, which can reduce processing costs and improve pressure resistance. In alternative embodiments, such as Figure 7 and Figure 8 As shown, the wall of the cylinder 13 is provided with multiple protrusions 131 extending into the heating chamber. The design of the protrusions 131 increases the structural strength of the outer shell 1, while also disturbing the water flow to create a turbulent effect, enhancing heat exchange efficiency. Moreover, the presence of the protrusions 131 reduces the volume of the internal space of the cylinder 13, thereby reducing the maximum water capacity that the cylinder 13 can hold and improving the efficiency of the heating element 2 in heating water. The structure of the protrusions 131 is not specifically limited. Figure 7 The image shows a design where boss 131 has a circular structure. Figure 8 The diagram shows a waist-shaped structure for the boss 131. Of course, the boss 131 can also be other suitable structures, such as a serpentine structure, a U-shaped structure, etc.

[0061] Regarding the structure of the heating element 2, in the preferred embodiment, as follows: Figure 3 and Figure 5 As shown, the heating element 2 includes two symmetrical heating element segments 21, and the temperature control tube 3 is located between the two heating element segments 21. The symmetrical layout of the two heating element segments 21 produces a synergistic heating effect, forming a surrounding heating field, eliminating the cold zone phenomenon of the single tube structure, making the distance between the water and the heating element 2 in all parts of the shell 1 more uniform, and making the heating element 2 heat the water more uniformly, thereby improving the heating efficiency; the clamping layout of the temperature control tube 3 in the center of the two heating element segments 21 optimizes the space utilization.

[0062] Furthermore, the two heating tube segments 21 are connected by an arc-shaped transition section 22 to form a U-shaped structure, and the temperature control tube 3 is integrally connected to the arc-shaped transition section 22. In this technical solution, the integrated connection of the U-shaped heating tube 2 and the temperature control tube 3 facilitates integral assembly, improves assembly efficiency, and reduces the risk of leakage; the arc-shaped transition section 22 can guide the water flow to a smooth turn, reducing flow resistance and noise. As an alternative, the two heating tube segments 21 can also be directly connected at their ends to form a V-shaped structure.

[0063] Furthermore, such as Figures 1 to 3 and Figure 5 As shown, one end of the temperature control tube 3 is a closed end 31, and the other end is an open end 32. The closed end 31 is connected to the arc-shaped transition section 22, and the position of the lead-in port 143 corresponds to the open end 32. The temperature control unit 4 is installed into or removed from the waterproof cavity through the lead-in port 143. In this technical solution, the tubular temperature control tube 3 has a slender structure, which is highly compatible with the structure of the outer shell 1, allowing the temperature control unit 4 to penetrate deep into the core heating area of ​​the heating cavity, thus improving temperature control accuracy. The closed end 31 of the temperature control tube 3 is connected to the heating tube 2, preventing communication between the heating tube 2 and the temperature control tube 3. The design of the tubular temperature control tube 3 with the lead-in port 143 allows the temperature control unit 4 to be easily disassembled and replaced without damaging the overall sealing structure. The temperature control unit 4 can be inspected through the lead-in port 143 while the instant heating device is in a fully assembled state, significantly reducing maintenance costs. The alignment of the open end 32 with the lead-in port 143 also facilitates the installation of the sealing structure. Based on the aforementioned heating element 2 having a water-proof flange 6, the temperature control tube 3 can also be welded together with the water-proof flange 6 to improve the overall strength.

[0064] Furthermore, such as Figure 3 , Figure 5 and Figure 6As shown, two heating tube sections 21 are connected to the temperature control tube 3 via a sealing flange 7. A sealing body 8 is provided between the sealing flange 7 and the outer casing 1. The sealing body 8 seals the fitting gap between the heating tube 2 and the wiring port 142 and forms a seal between the lead port 143 and the open end 32. Specifically, based on the aforementioned wiring port 142 being located on the top cover 14, the lead port 143 can also be located on the top cover 14, between the two wiring ports 142. The sealing body 8 is provided with a middle clearance hole 81 that allows the lead port 143 and the open end 32 of the temperature control tube 3 to pass through. Corresponding wiring clearance holes 82 are provided on both sides of the middle clearance hole 81, allowing the end of the heating tube 2 to pass through the wiring clearance hole 82 and then through the wiring port 142. The sealing flange 7 clamps the sealing body 8 to the outer shell 1. The elastic deformation of the sealing body 8 ensures the sealing of the gap between the heating tube 2 and the wiring port 142, as well as the sealing between the lead port 143 and the open end 32, reducing the risk of water leakage and water seepage into the temperature control tube 3.

[0065] As a preferred embodiment of this application, such as Figure 2 and Figure 4 As shown, the heating chamber is equipped with a water inlet baffle 9 for shaping the water entering through the water inlet 151. The edge of the water inlet baffle 9 forms a circumferentially extending water passage gap with the outer shell 1. Taking the aforementioned scheme where the water inlet 151 is located on the bottom cover 15 of the outer shell 1 as an example, the water inlet baffle 9 can be fixed on the bottom cover 15. The water inlet baffle 9 and the bottom cover 15 form a water inlet space located at the bottom of the water inlet chamber 11. When water enters the outer shell 1 through the water inlet 151, it flows along the circumferential water passage gap under the obstruction of the water inlet baffle 9, thereby enabling it to be more evenly distributed in the outer shell 1, improving the heating uniformity of the heating tube 2, and making the water heat up evenly.

[0066] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0067] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0068] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A waterproof instant heating device, characterized in that, The device includes a housing, a heating element, and a temperature control element. The heating element and the temperature control element are located inside the heating cavity of the housing. The temperature control element has a waterproof cavity, and a temperature control unit is located inside the waterproof cavity. The temperature control element isolates the water inside the heating cavity from the outside of the waterproof cavity. The housing has a water inlet, a water outlet, a wiring port, and a lead wire port. The end of the heating element with a wiring terminal extends out from the wiring port, and the wire connected to the temperature control unit passes through the lead wire port.

2. The waterproof instant heating device according to claim 1, characterized in that, The heating element is provided with a water-proof flange, which connects to the outer shell and divides the heating chamber into a water inlet chamber and a water outlet chamber. The water inlet is connected to the water inlet chamber, and the water outlet is connected to the water outlet chamber. The water-proof flange is provided with a water passage hole that connects the water inlet chamber and the water outlet chamber.

3. The waterproof instant heating device according to claim 2, characterized in that, The water-proof flange is provided with a plurality of water passage holes, and the cross-sectional area of ​​the water inlet and the cross-sectional area of ​​the water outlet are both less than or equal to the sum of the cross-sectional areas of the plurality of water passage holes.

4. The waterproof instant heating device according to claim 2, characterized in that, The outer casing includes a cylindrical body and a top cover and a bottom cover that respectively cover the upper and lower ends of the cylindrical body. The water-proof flange is located between the top cover and the cylindrical body. The top cover is connected to the water-proof flange and seals the water outlet cavity. The cylindrical body is connected to the water-proof flange and seals the water inlet cavity. The water inlet is located on the bottom cover, and the water outlet is located on the top cover.

5. The waterproof instant heating device according to claim 4, characterized in that, The cylinder has smooth inner and outer surfaces and uniform wall thickness; Alternatively, the wall of the cylinder may be provided with multiple protrusions extending into the heating chamber.

6. The waterproof instant heating device according to claim 1, characterized in that, The heating element comprises two symmetrical heating tube segments, and the temperature control tube is located between the two heating tube segments.

7. The waterproof instant heating device according to claim 6, characterized in that, The two heating tube segments are connected by an arc-shaped transition section to form a U-shaped structure, and the temperature control tube is integrally connected to the arc-shaped transition section.

8. The waterproof instant heating device according to claim 7, characterized in that, One end of the temperature control tube is a closed end and the other end is an open end. The closed end is connected to the arc-shaped transition section. The position of the lead-in port corresponds to the open end. The temperature control unit is inserted into the waterproof cavity or taken out of the waterproof cavity through the lead-in port.

9. The waterproof instant heating device according to claim 8, characterized in that, The two heating tube segments are connected to the temperature control tube via a sealing flange. A sealing body is provided between the sealing flange and the outer casing. The sealing body seals the gap between the heating tube and the wiring port and forms a seal between the lead-in port and the open end.

10. The waterproof instant heating device according to claim 1, characterized in that, The heating chamber is equipped with a water inlet baffle for shaping the water entering through the inlet, and the edge of the water inlet baffle forms a circumferentially extending water passage gap with the outer shell.

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