Anti-dry-burning electric water heater

Abstract

An anti-dry-burn electric water heater includes an inner tank, an electric heating tube, an anti-dry-burn component and a circuit control board; the electric heating tube is installed on the inner tank through an electric heating tube flange; the anti-dry-burn component includes a water outlet joint, a water guide pipe and a water contact conductive sub-component, the water outlet joint is installed on the outer side of the bottom of the inner tank, the water guide pipe is arranged in the inner tank, the bottom end of the water guide pipe is connected to the water outlet joint and is internally connected, the height of the top of the water guide pipe is higher than the height of the highest point of the electric heating tube, one end of the water contact conductive sub-component is connected to the water outlet joint, and the conductive end of the water contact conductive sub-component passes through the pipe wall of one side of the water guide pipe; the circuit control board judges whether there is water in the water guide pipe according to the resistance value between the electric heating tube flange and the water contact conductive sub-component. By obtaining the resistance value between the anti-dry-burn component and the two poles of the inner tank, the on and off state of the electric heating tube is controlled according to the resistance value, so as to prevent the inner tank and internal electrical components of the electric water heater from dry-burning.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to an anti-dry-burning electric water heater. Background Art

[0002] Electric water heaters are household appliances widely used in modern life, but in the actual use of electric water heaters, the following situations exist: when the user uses the electric water heater for the first time or drains the electric water heater for cleaning, the user directly powers on the electric water heater. At this time, there is no water in the inner tank of the electric water heater, or the inner tank is taking in water but the amount of water is not enough. Therefore, the electric heating tube is energized to heat the inner tank, which is equivalent to dry burning, which can easily cause the electric water heater to dry burn and damage components. There are also certain safety hazards.

[0003] In the prior art, there are usually two anti-dry-burning schemes for electric water heaters. One is to detect the temperature rise rate of the inner tank by detecting the temperature probe to determine whether it is dry-burning. If the temperature rise rate is too fast and exceeds the normal heating rise rate, it is determined to be dry-burning, and all relays are switched to stop the electric heating tube from heating; the other is to prevent dry-burning through the action of the thermal circuit breaker. If the temperature of the inner tank exceeds the limit value of the thermal circuit breaker, the thermal circuit breaker will be activated to disconnect the circuit. However, whether it is the temperature sensor detection or the thermal circuit breaker to disconnect the circuit to stop heating, these two schemes are post-remedial measures. The electric water heater has already been dry-burned, and the internal components of the electric water heater may have been damaged in the process. Utility Model Content

[0004] In view of the problems raised by the background technology, the purpose of the utility model is to provide an anti-dry-burning electric water heater, which solves the problem that the existing electric water heaters cannot prevent the inner tank from dry-burning in advance.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] An anti-dry-burning electric water heater, comprising an inner tank, an electric heating tube, an anti-dry-burning component and a circuit control board;

[0007] The inner tank comprises a water inlet and a water outlet, the electric heating pipe is installed inside the inner tank through an electric heating pipe flange, and the circuit control board is electrically connected to the electric heating pipe flange;

[0008] The anti-dry-burning assembly includes a water outlet joint, a water guide pipe and a water contact conductive subassembly, wherein the water outlet joint is installed on the outer side of the bottom of the inner tank, the water guide pipe is vertically arranged in the inner tank, the bottom end of the water guide pipe is connected to the water outlet joint, and the water guide pipe is communicated with the inside of the water outlet joint, the top of the water guide pipe is higher than the height of the highest point of the electric heating tube, the water contact conductive subassembly is arranged outside the inner tank, one end of the water contact conductive subassembly is connected to the water outlet joint, and the conductive end of the water contact conductive subassembly connected to the water outlet joint passes through a side wall of the water guide pipe, and the other end of the water contact conductive subassembly is electrically connected to the circuit control board;

[0009] The circuit control board determines whether there is water in the water pipe according to the resistance value between the electric heating pipe flange and the water contact conductive subassembly.

[0010] Preferably, the length of the water conduit located in the inner pot is the same as the height of the inner diameter of the inner pot in the vertical direction.

[0011] Preferably, the water contact conductive subassembly comprises a water contact connector, a wire harness and an electrical plug;

[0012] The water contact joint is arranged at one end of the wire bundle, and the electrical plug is arranged at the other end of the wire bundle, the water contact joint is used to be connected to the water outlet joint, and the electrical plug is used to be electrically connected to the circuit control board;

[0013] The conductive end is located at an end of the water contact connector away from the wire bundle.

[0014] Preferably, the water outlet joint comprises a water outlet hole and a plug hole;

[0015] The water outlet hole vertically penetrates the water outlet joint body, and the water conduit of the water conduit is connected to the water outlet hole;

[0016] The plug-in hole is communicated with the water outlet hole, the water outlet hole horizontally penetrates the outer wall of the water outlet joint body, and the water contact joint is inserted into the plug-in hole;

[0017] A through hole is provided on the tube wall of the bottom end of the water conduit, and the conductive end passes through the through hole.

[0018] Preferably, the water contact joint comprises an inserting portion and a wiring portion;

[0019] The inserting portion matches the inserting hole, the inserting portion is used to be inserted into the inserting hole, and the inserting portion is the conductive end;

[0020] The area of ​​the vertical cross section of the wiring portion is larger than the area of ​​the vertical cross section of the insertion portion. The wiring portion is located outside the water outlet joint and is used to connect the wire harness.

[0021] Preferably, it also includes a pressing plate and a screw, and the water contact joint is fixedly connected to the water outlet joint through the pressing plate and the screw.

[0022] Preferably, the wire harness includes two NTC temperature sensing leads and a water contact conductive lead, and the water contact conductive lead is connected to the insertion portion.

[0023] Preferably, the circuit control board is electrically connected to the electric heating pipe flange via a first wire;

[0024] The circuit control board is electrically connected to the water-contact conductive subassembly via a second wire and a plug. The plug is connected to an end of the second wire away from the circuit control board. The plug and the electrical plug are male and female plugs respectively, and the plug and the electrical plug are detachably connected.

[0025] Preferably, it also includes a shell, the shell wraps the inner shell, and the circuit control board is installed on the shell.

[0026] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0027] By setting up an anti-dry-burning component, the anti-dry-burning component and the inner tank are connected to the circuit control board respectively and regarded as the two poles of the circuit. The circuit control board obtains the resistance value between the two poles and controls the power on and off of the electric heating tube according to the resistance value, thereby preventing the inner tank and internal electrical components of the electric water heater from dry-burning. Compared with the existing electric water heaters, which only start the protection measures after dry-burning occurs, it plays an effective protection role in preventing dry-burning in advance, improving the safety performance of the electric water heater and the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the utility model;

[0029] Figure 2 It is a connection diagram of the electrical components of the utility model;

[0030] Figure 3 It is a structural schematic diagram of the anti-dry burning component of the utility model;

[0031] Figure 4 It is an exploded view of the anti-dry burning assembly of the utility model;

[0032] Figure 5 yes Figure 4 The enlarged schematic diagram of point A in the middle;

[0033] Figure 6 It is a schematic diagram of the state when the inner tank of the utility model is not full of water;

[0034] Figure 7 It is a schematic diagram of the state when the inner tank of the utility model is full of water.

[0035] Among them: inner tank 1, electric heating tube 21, electric heating tube flange 22, anti-dry burning component 3, water outlet joint 31, water outlet hole 311, plug hole 312, water pipe 32, through hole 321, water contact conductive sub-component 33, water contact joint 331, plug-in part 3311, wiring part 3312, wire bundle 332, electrical plug 333, pressing sheet 334, screw 335, shell 6, circuit control board 7, first wire 71, second wire 72 and plug 73. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0038] In addition, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and "third" may explicitly or implicitly include one or more of the features.

[0039] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0040] The following is combined with Figures 1 to 7 The technical solution of the utility model is further illustrated by specific implementation methods.

[0041] An anti-dry-burning electric water heater, comprising an inner tank 1, an electric heating tube 21, an anti-dry-burning component 3 and a circuit control board 7;

[0042] The inner pot 1 includes a water inlet and a water outlet, the electric heating pipe 21 is installed inside the inner pot 1 through the electric heating pipe flange 22, and the circuit control board 7 is electrically connected to the electric heating pipe flange 22;

[0043] The anti-dry burning component 3 includes a water outlet joint 31, a water pipe 32 and a water contact conductive sub-component 33. The water outlet joint 31 is installed on the outer side of the bottom of the inner tank 1. The water pipe 32 is vertically arranged in the inner tank 1. The bottom end of the water pipe 32 is connected to the water outlet joint 31, and the water pipe 32 is communicated with the inside of the water outlet joint 31. The height of the top of the water pipe 32 is higher than the height of the highest point of the electric heating tube 21. The water contact conductive sub-component 33 is arranged outside the inner tank 1. One end of the water contact conductive sub-component 33 is connected to the water outlet joint 31, and the conductive end of the water contact conductive sub-component 33 connected to the water outlet joint 31 passes through a side wall of the water pipe 32. The other end of the water contact conductive sub-component 33 is electrically connected to the circuit control board 7.

[0044] The circuit control board 7 determines whether there is water in the water pipe 32 according to the resistance value between the electric heating pipe flange 22 and the water contact conductive subassembly 33 .

[0045] The utility model provides an anti-dry-burning electric water heater, which includes an inner tank 1, an electric heating tube 21, an anti-dry-burning component 3 and a circuit control board 7. The circuit control board 7 is electrically connected to the anti-dry-burning component 3 and the electric heating tube flange 22 respectively, and according to the resistance value between the two, it is judged whether liquid flows into the water conduit 32, and the power-on or power-off of the electric heating tube 21 is controlled according to the judgment result to prevent the inner tank 1 from being dry-burned.

[0046] like Figure 1 and Figure 2As shown, the anti-dry-burning component 3 of the electric water heater includes a water outlet joint 31 arranged on the outside of the inner tank 1; a water pipe 32 is vertically arranged inside the inner tank 1, and the bottom end of the water pipe 32 is connected to the water outlet joint 31. The stored water inside the inner tank 1 can enter through the top of the water pipe 32 and be guided to the bottom through the inside of the water pipe 32; a water contact conductive sub-component 33 is arranged outside the inner tank 1, and one end of the water contact conductive sub-component 33 is connected to the water outlet joint 31, and the conductive end passes through the water outlet joint 31 and the pipe wall of the water pipe 32 and is placed inside the water pipe 32. When the water level in the inner tank 1 does not reach the top opening of the water pipe 32, the liquid cannot flow into the water pipe 32. At this time, the circuit control board 7 collects the resistance value between the water contact conductive subassembly 33 and the electric heating pipe flange 22 to be infinite, indicating that the water contact conductive subassembly 33 is not "in contact" with the inner tank 1, the circuit is not conductive, and the electric heating pipe 21 is not energized and does not heat; when the water level in the inner tank 1 reaches the top opening of the water pipe 32, the liquid flows into the water pipe 32 from the top opening and is guided to the bottom, contacting the water contact conductive subassembly 33. At this time, the circuit control board 7 collects the specific resistance value between the water contact conductive subassembly 33 and the electric heating pipe flange 22, indicating that the water contact conductive subassembly 33 is "in contact" with the inner tank 1, the circuit is in a conductive state, and the electric heating pipe 21 is energized and heats the water stored in the inner tank 1. Among them, the resistance value collected by the circuit control board 7 between the electric heating pipe flange 22 and the water contact conductive subassembly 33 can refer to the principle of paragraphs 0040 to 0042 of the specification of Chinese patent CN212307626U. It is worth noting that the electric heating pipe 21 is installed on the inner tank 1 through the electric heating pipe flange 22. At this time, the electric heating pipe 21, the electric heating pipe flange 22 and the inner tank 1 can be regarded as a whole; and the water contact conductive subassembly 33 is connected to the water outlet joint 31 instead of directly contacting the inner tank 1. Therefore, the electric heating pipe 21, the electric heating pipe flange 22, the inner tank 1, the anti-dry burning component 3 and the circuit control board 7 overall circuit (hereinafter referred to as "resistance circuit") can be connected through liquid / water as a medium.

[0047] To further illustrate, the height of the top of the water pipe 32 should be higher than the height of the highest point of the electric heating tube 21. The water stored in the inner pot 1 must completely submerge the electric heating tube 21 to reach the opening at the top of the water pipe 32, ensuring that the electric heating tube 21 as a whole will not be in a dry-burning state.

[0048] By setting up the anti-dry burning component 3, the anti-dry burning component 3 and the inner tank 1 are connected to the circuit control board 7 respectively, and regarded as the two poles of the circuit, the circuit control board 7 obtains the resistance value between the two poles, and controls the power on and off of the electric heating tube 21 according to the resistance value, so as to prevent the inner tank and internal electrical components of the electric water heater from dry burning. Compared with the existing electric water heater, the protective measures are only activated after dry burning occurs, which plays an effective protection role in preventing dry burning in advance, and improves the safety performance of the electric water heater and the user experience.

[0049] Furthermore, the length of the water conduit 32 located in the inner pot 1 is the same as the height of the inner diameter of the inner pot 1 in the vertical direction.

[0050] Since the length of the water pipe 32 in the inner tank 1 is the same as the aperture of the inner tank 1, it means that the inner tank 1 needs to be filled with water as a whole before the water level can reach the opening at the top of the water pipe 32, flow into the water pipe 32 from the opening, and flow down to the water contacting the conductive subassembly 33 at the bottom of the water pipe 32, so that the resistance circuit is connected. Therefore, it can be ensured that the electric heating tube 21 will not be powered on for heating before the inner tank 1 is filled with water, which can most effectively prevent dry burning and further improve the safety of the electric water heater.

[0051] Furthermore, the water contact conductive subassembly 33 includes a water contact connector 331, a wire harness 332 and an electrical plug 333;

[0052] The water contact connector 331 is provided at one end of the wire harness 332, and the electrical plug 333 is provided at the other end of the wire harness 332. The water contact connector 331 is used to connect with the water outlet connector 31, and the electrical plug 333 is used to electrically connect with the circuit control board 7.

[0053] The conductive end is located at an end of the water contact connector 331 away from the wire bundle 332 .

[0054] The water contact conductive electronic assembly 33 is subdivided into three parts: a water contact connector 331, a wire harness 332, and an electrical plug 333. This modular design makes the structure of the entire assembly clearer and easier to produce, install, and maintain. The water contact connector 331 is directly connected to the water outlet connector 31, the wire harness 332 makes the various leads more neat and reduces the mess of the leads, and the electrical plug 333 is directly electrically connected to the circuit control board 7, which reduces the installation steps and complexity and improves the convenience of installation and maintenance.

[0055] Furthermore, the water outlet connector 31 includes a water outlet hole 311 and a plug hole 312;

[0056] The water outlet hole 311 vertically penetrates the water outlet joint body, and the water conduit of the water conduit 32 is connected to the water outlet hole 311;

[0057] The plug hole 312 is connected to the water outlet hole 311, the water outlet hole 311 horizontally penetrates the outer wall of the water outlet connector body, and the water contact connector 331 is inserted into the plug hole 312;

[0058] A through hole 321 is formed on the tube wall at the bottom end of the water conduit 32 , and the conductive end passes through the through hole 321 .

[0059] The water outlet connector 31 integrates the water outlet hole 311 and the plug hole 312, and the tube wall of the water pipe 32 is provided with a through hole 321. When the water contact connector 331 is installed on the water outlet connector 31 through the plug hole 312, the end of the water contact connector 331 passes through the through hole 321 of the water pipe 32 and is located inside the water pipe 32, thereby realizing a direct connection among the water outlet connector 31, the water pipe 32 and the water contact connector 331, making the overall structure more compact, reducing the gap between components, improving installation efficiency, and also improving the conduction stability of the resistance circuit.

[0060] Furthermore, the water contact joint 331 includes an inserting portion 3311 and a wiring portion 3312;

[0061] The inserting portion 3311 matches the plug hole 312 , and the inserting portion 3311 is used to be inserted into the plug hole 312 , and the inserting portion 3311 is the conductive end;

[0062] The area of ​​the vertical cross section of the wiring portion 3312 is greater than the area of ​​the vertical cross section of the insertion portion 3311 . The wiring portion 3312 is located outside the water outlet connector 31 . The wiring portion 3312 is used to connect the wire harness 332 .

[0063] The water contact joint 331 is divided into an insertion part 3311 and a wiring part 3312, wherein the insertion part 3311 matches the plug hole 312, so that the water contact joint 331 can be firmly inserted into the plug hole 312 of the water outlet joint 31, avoiding the potential safety hazard caused by a loose connection. The wiring part 3312 is located outside the water outlet joint 31, and the wiring part 3312 is connected to the wire harness 332, and the vertical cross-sectional area of ​​the wiring part 3312 is larger than the vertical cross-sectional area of ​​the insertion part 3311, which makes the connection between the water contact joint 331 and the water outlet joint 31 more stable on the one hand, and on the other hand, the wiring part 3312 limits the movement of the wire harness 32 into the water outlet joint 31, reducing the circuit risk caused by loose connection, and also avoiding the aging or damage of the wire harness 32 caused by a humid environment, thereby improving the reliability of the entire anti-dry burning assembly 3.

[0064] Furthermore, it also includes a pressing plate 334 and a screw 335 , and the water contact joint 331 is fixedly connected to the water outlet joint 31 through the pressing plate 334 and the screw 335 .

[0065] By using the pressing plate 334 and the screw 335 for fixed connection, the sealing and stability of the connection part can be effectively enhanced. This mechanical fixing method can ensure that during the operation of the electric water heater, even if it is affected by external forces such as water flow impact or vibration, the connection part will not easily loosen or fall off.

[0066] Furthermore, the wire harness 332 includes two NTC temperature sensing leads and one water contact conductive lead, and the water contact conductive lead is connected to the insertion portion 3311 .

[0067] By introducing two NTC temperature sensing leads, the water temperature changes in the inner tank of the electric water heater can be monitored in real time; by introducing a water contact conductive lead, the water contact conductive lead is connected to the plug-in part 3311, which can achieve rapid and accurate sensing of the liquid in the water pipe 32.

[0068] Preferably, the two NTC temperature sensing leads can also be combined with an anti-dry-burn component for real-time water temperature monitoring, forming a double safety protection mechanism. Once the water temperature rises abnormally or falls below the set value, the water heater can respond quickly and cut off the power supply to avoid dry-burning or other safety hazards.

[0069] By integrating the NTC temperature sensing lead and the water contact conductive lead into the wiring harness 332, the internal wiring of the water heater is simplified, and the overall reliability of the system is improved. At the same time, this design is also convenient for subsequent maintenance and replacement work.

[0070] Furthermore, the circuit control board 7 is electrically connected to the electric heating pipe flange 22 via a first wire 71;

[0071] The circuit control board 7 is electrically connected to the water contact conductive subassembly 33 via a second wire 72 and a plug 73. The plug 73 is connected to an end of the second wire 72 away from the circuit control board 7. The plug 73 and the electrical plug 333 are male and female plugs respectively. The plug 73 and the electrical plug 333 are detachably connected.

[0072] The circuit control board 7 is electrically connected to the electric heating pipe flange 22 through the first wire 71, which ensures the connectivity of the resistance circuit on the one hand, and ensures that the electric heating pipe works under the direct control of the circuit control board 7 on the other hand, reducing the safety hazards caused by line failures.

[0073] The circuit control board 7 is electrically connected to the water contact conductive subassembly 33 through the second wire 72 and the plug 73. This design makes the circuit connection clearer and more reliable, and reduces the risk of failure caused by poor contact or short circuit. The plug 73 and the electrical plug 333 are designed as male and female plugs and are detachably connected. This design makes it unnecessary to disassemble the entire water heater or the complex circuit part when the anti-dry burning component needs to be replaced or repaired. Simply unplug the plug 73 to complete the separation of the circuit control board 7 and the water contact conductive subassembly 33, which greatly simplifies the maintenance process.

[0074] Furthermore, it also includes an outer shell 6 , which wraps the inner shell 1 , and the circuit control board 7 is installed on the outer shell 6 .

[0075] The outer shell 6 acts as a protective barrier, which can effectively prevent external factors (such as dust, moisture, foreign matter, etc.) from directly contacting the inner tank 1, reducing the risk of damage or failure of the inner tank 1, thereby enhancing the safety of the water heater.

[0076] Furthermore, the housing 6 can take into account the heat dissipation requirements and improve the heat dissipation performance of the water heater through reasonable ventilation holes or heat sink designs. This is essential to ensure the normal operation of key components such as the circuit control board 7 and helps prevent malfunctions caused by overheating.

[0077] The outer shell 6 improves the safety, stability and aesthetics of the electric water heater, and can enhance the user experience.

[0078] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. An anti-dry-burning electric water heater, characterized in that: Including inner tank, electric heating tube, anti-dry burning component and circuit control board; The inner tank comprises a water inlet and a water outlet, the electric heating pipe is installed inside the inner tank through an electric heating pipe flange, and the circuit control board is electrically connected to the electric heating pipe flange; The anti-dry-burning assembly includes a water outlet joint, a water pipe and a water contact conductive subassembly, wherein the water outlet joint is installed on the outer side of the bottom of the inner pot, the water pipe is vertically arranged in the inner pot, the bottom end of the water pipe is connected to the water outlet joint, and the water pipe is communicated with the inside of the water outlet joint, the top of the water pipe is higher than the height of the highest point of the electric heating tube, the water contact conductive subassembly is arranged outside the inner pot, one end of the water contact conductive subassembly is connected to the water outlet joint, and the conductive end of the water contact conductive subassembly connected to the water outlet joint passes through a side wall of the water pipe, and the other end of the water contact conductive subassembly is electrically connected to the circuit control board; The circuit control board determines whether there is water in the water pipe according to the resistance value between the electric heating pipe flange and the water contact conductive subassembly.

2. The anti-dry-burning electric water heater according to claim 1, characterized in that: The length of the water conduit located in the inner container is the same as the height of the inner diameter of the inner container in the vertical direction.

3. An anti-dry-burning electric water heater according to any one of claims 1 or 2, characterized in that: The water contact conductive subassembly comprises a water contact joint, a wire harness and an electrical plug; The water contact joint is arranged at one end of the wire bundle, and the electrical plug is arranged at the other end of the wire bundle, the water contact joint is used to be connected to the water outlet joint, and the electrical plug is used to be electrically connected to the circuit control board; The conductive end is located at an end of the water contact connector away from the wire bundle.

4. The anti-dry-burning electric water heater according to claim 3, characterized in that: The water outlet joint comprises a water outlet hole and a plug hole; The water outlet hole vertically penetrates the water outlet joint body, and the water conduit of the water conduit is connected to the water outlet hole; The plug-in hole is connected to the water outlet hole, the water outlet hole horizontally penetrates the outer wall of the water outlet joint body, and the water contact joint is inserted into the plug-in hole; A through hole is provided on the tube wall of the bottom end of the water conduit, and the conductive end passes through the through hole.

5. The anti-dry-burning electric water heater according to claim 4, characterized in that: The water contact joint comprises an inserting portion and a wiring portion; The inserting portion matches the plug-in hole, the inserting portion is used to be inserted into the plug-in hole, and the inserting portion is the conductive end; The area of ​​the vertical cross section of the wiring portion is larger than the area of ​​the vertical cross section of the insertion portion. The wiring portion is located outside the water outlet joint and is used to connect the wire harness.

6. The anti-dry-burning electric water heater according to claim 5, characterized in that: It also includes a pressing sheet and a screw, and the water contact joint is fixedly connected to the water outlet joint through the pressing sheet and the screw.

7. The anti-dry-burning electric water heater according to claim 6, characterized in that: The wire harness includes two NTC temperature sensing leads and a water contact conductive lead, and the water contact conductive lead is connected to the insertion portion.

8. The anti-dry-burning electric water heater according to claim 7, characterized in that: The circuit control board is electrically connected to the electric heating pipe flange through a first wire; The circuit control board is electrically connected to the water-contact conductive subassembly via a second wire and a plug. The plug is connected to an end of the second wire away from the circuit control board. The plug and the electrical plug are male and female plugs respectively, and the plug and the electrical plug are detachably connected.

9. The anti-dry-burning electric water heater according to claim 8, characterized in that: It also includes a shell, which wraps the inner container, and the circuit control board is installed on the shell.

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