Sectional type heating mechanism and electric water heater

Abstract

The invention discloses a sectional type heating mechanism, and belongs to the technical field of electric water heaters, the sectional type heating mechanism comprises a shell and a cover plate, a plurality of outer pipes are arranged in the shell, inner pipes are inserted in the outer pipes, and the adjacent outer pipes are communicated through connecting pipelines to form a water conveying loop; a water passing channel is formed between the inner wall of the inner pipe and the inner wall of the outer pipe, and a spiral plate used for turbulent flow is arranged on the outer wall of the inner pipe in the axial direction. The inner pipe is filled with a heat-conducting medium and is provided with a heating assembly, and the heating assembly is sequentially divided into at least two heating sections with different power levels in the water flow direction of the water conveying loop. According to the heating mechanism and the electric water heater, segmented gradient heating and precise constant temperature can be provided, and the heating mechanism and the electric water heater are reliably grounded.

Description

Technical Field

[0001] This invention relates to the field of electric water heater technology, and in particular to a segmented heating mechanism and an electric water heater. Background Technology

[0002] Electric water heaters are widely used heating devices in modern homes and industries. Their core performance is mainly reflected in heating efficiency and operational safety. Currently, electric water heaters on the market are mainly divided into two types: storage type and instantaneous type.

[0003] For instant or pipe-heated water heaters that seek rapid water output and continuous heating, existing heating mechanisms generally face the following technical bottlenecks: First, traditional heating tubes often adopt a smooth inner wall design, which easily forms a laminar boundary layer when water flows in the pipe, resulting in high thermal resistance and limiting heat transfer efficiency.

[0004] Meanwhile, the heating element is in a high-temperature state for a long time, and calcium and magnesium ions in the water are prone to deposit on the inner wall to form scale. This not only further reduces the heat exchange efficiency, but may also cause local overheating, and in severe cases, cause the heating element to burn out.

[0005] Secondly, existing multi-stage heating systems typically employ parallel or unified control methods, lacking segmented and precise adjustment based on water flow conditions. Cold water directly entering the high-temperature heating zone may generate significant thermal stress, shortening the equipment's lifespan. Furthermore, under different flow demand scenarios (such as handwashing and showering), it is difficult to dynamically adjust the heating power combination, resulting in energy waste or significant fluctuations in outlet water temperature, making it impossible to achieve stable constant temperature water supply.

[0006] Third, in the design of long pipelines with multiple convoluted pipes, thermal expansion and contraction may cause deformation stress in the pipeline, leading to loosening of the connection parts or vibration and noise. In addition, although the water and electricity separation design can improve safety to a certain extent, how to ensure that all metal components (especially those electrically isolated due to insulating gaskets or special structures) in complex pipeline systems have a reliable grounding path to avoid leakage accidents remains a key technical challenge in the design process. Summary of the Invention

[0007] The purpose of this invention is to provide a segmented gradient heating and precise constant temperature heating mechanism and an electric water heater with reliable grounding.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: a segmented heating mechanism, characterized in that it includes a shell and a cover plate, wherein a plurality of outer tubes are provided inside the shell, and an inner tube is inserted inside the outer tubes, and adjacent outer tubes are connected by connecting pipes to form a water supply circuit;

[0009] A water passage is formed between the inner walls of the inner tube and the outer tube, and a spiral plate for turbulence is provided on the outer wall of the inner tube along the axial direction.

[0010] The inner tube is filled with a heat-conducting medium and equipped with a heating component. The heating component is divided into at least two heating sections with different power levels along the water flow direction of the water supply circuit.

[0011] As a further description of the above technical solution: the outer pipes are arranged in an array, the connecting pipe is a U-shaped pipe, the U-shaped pipe connects the ends of two adjacent outer pipes to form an S-shaped meandering water conveyance loop, and a first sealing ring is provided at the connection between the U-shaped pipe and the outer pipe;

[0012] The outer circumferential surface of the outer tube is fixedly supported by several mounting components.

[0013] As a further description of the above technical solution: the open end of the inner tube is provided with an outwardly expanding flange, and the end of the outer tube is provided with a placement groove; the flange is embedded in the placement groove;

[0014] The flange has an outlet hole on its circumference that connects the U-shaped pipe and the water passage.

[0015] As a further description of the above technical solution: the power level of the heating component increases from the inlet to the outlet along the water flow direction, and includes a low-power heating section for preheating, a medium-power heating section for heating, and a high-power heating section for constant temperature.

[0016] As a further description of the above technical solution: the heating component includes a low-power ceramic heating rod, a medium-power ceramic heating rod, and a high-power ceramic heating rod.

[0017] As a further description of the above technical solution: the U-shaped pipe has an outwardly extending outlet pipe at the bend, the inner pipe has an end cap extending into the outlet pipe at the open end, and a second sealing ring is provided at the connection between the outlet pipe and the end cap.

[0018] The heating assembly is connected to a wire, which passes through the end cap and exits from the outlet pipe;

[0019] The end of the outlet tube is threaded with a sealing cap, and the sealing cap is provided with a sealing ring for sealing the wire.

[0020] As a further description of the above technical solution: the grounding component includes an external grounding busbar, and a connecting piece is fixed on the surface of the outer tube. The connecting piece is electrically connected to the grounding busbar through a yellow-green wire.

[0021] The grounding busbar is fixedly installed via an insulating support.

[0022] As a further description of the above technical solution: the two ends of the yellow-green wire are respectively provided with a first terminal and a second terminal. The first terminal is connected to the connecting piece by a first bolt group, and the second terminal is connected to the grounding busbar by a second bolt group.

[0023] An electric water heater includes a water tank, a tank cover, a water pump, and a housing, and further includes a segmented heating mechanism as described in any one of the claims; the segmented heating mechanism is installed in the mounting groove of the housing, the input end of the water pump is connected to the water tank through a water inlet pipe, and the output end of the water pump is connected to the water inlet pipe of the segmented heating mechanism.

[0024] As a further description of the above technical solution: the segmented heating mechanism is provided with a water outlet pipe, and the drain pipe connected to the water outlet pipe extends to the outside of the water tank;

[0025] A temperature sensor is installed on the outlet pipe, and a flow sensor is installed on the inlet pipe;

[0026] It also includes a control panel, which independently controls the start and stop of heating sections with different power levels based on signals from the flow sensor and temperature sensor.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] This invention employs a three-stage gradient heating strategy. In the inlet section, a low-power heating rod is configured to reduce the temperature shock when cold water enters. In the middle section, a medium-power heating rod is configured to significantly increase the water temperature, thereby achieving the main heat transfer. In the outlet section, a high-power heating rod is configured. Combined with a PID control system and an NTC temperature sensor, the system achieves rapid response to maintain the stability of the outlet water temperature and avoid temperature fluctuations. Furthermore, the system can flexibly adjust the start and stop status of the heating rods according to the actual flow conditions, thereby effectively saving energy.

[0029] This invention designs a grounding component, which includes an independent grounding busbar, an L-shaped connector, and a yellow-green wire. All metal parts of the outer pipe, inlet pipe, and outlet pipe are connected to the grounding busbar through a low-impedance connection, thereby ensuring that even if the inner pipe is damaged and leaks current, the current can still be quickly conducted to the ground and trigger the leakage protection switch to trip. At the same time, the heating component adopts a sleeve-type water-electricity separation structure, combined with heat-conducting medium filling and multiple sealing ring design, which effectively improves the electrical insulation performance and waterproof sealing effect from the source. Attached Figure Description

[0030] Figure 1 A perspective view of the present invention is shown;

[0031] Figure 2 A cross-sectional view of the present invention is shown;

[0032] Figure 3 A cross-sectional view of the water conveyance pipeline of the present invention is shown;

[0033] Figure 4 The present invention is shown. Figure 3 Enlarged view of point A in the middle;

[0034] Figure 5 A top view of the invention is shown;

[0035] Figure 6 A perspective view of the grounding component of the present invention is shown;

[0036] Figure 7 A perspective view of the water tank of the present invention is shown;

[0037] Figure 8 A perspective view of the inner tube and spiral plate of the present invention is shown.

[0038] Legend:

[0039] 10. Water tank; 11. Tank cover; 12. Control panel; 13. Mounting slot; 14. Outer casing; 15. Cover plate; 16. Water pump;

[0040] 20. U-shaped pipe; 201. Outlet pipe; 21. External pipe; 211. Placement groove; 22. Inlet pipe; 23. Outlet pipe; 24. Drain pipe; 25. Installation parts; 26. Water supply pipe;

[0041] 30. Inner tube; 31. Flange; 32. Water outlet; 33. Spiral plate; 34. Heat transfer medium; 35. Low-power ceramic heating rod; 36. Medium-power ceramic heating rod; 37. High-power ceramic heating rod; 38. Wire; 39. End cap;

[0042] 40. First sealing ring; 41. Second sealing ring; 42. Sealing cap;

[0043] 50. Grounding busbar; 51. Insulating support; 52. Connecting piece; 53. First bolt group; 54. First terminal; 55. Yellow-green wire; 56. Second terminal; 57. Second bolt group; Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Please see Figures 1-8The present invention provides a technical solution: a segmented heating mechanism and an electric water heater, including a water tank 10, a tank cover 11 installed on the top of the water tank 10, a control panel 12 embedded in the front, and an installation groove 13 on the front.

[0046] The outer casing 14 is fixedly installed in the mounting slot 13 by bolts, and the cover plate 15 is sealed by bolts on the outer casing 14, thus forming a relatively closed heating chamber.

[0047] The housing 14 integrates water supply pipes and heating components, with the water supply pipes adopting an S-shaped meandering layout to increase the heat exchange path.

[0048] The water supply pipeline includes several U-shaped pipes 20 and straight cylindrical outer pipes 21. In this embodiment, the outer pipes 21 are made of stainless steel, with a total of 12 pipes arranged in an array. Two adjacent outer pipes 21 are connected by a connecting pipe to achieve a 180-degree bend. The connecting pipe is a U-shaped pipe 20, which connects the ends of two adjacent outer pipes 21 to form an S-shaped meandering water supply loop.

[0049] Several mounting pieces 25 are provided around the outer tube 21. One end of the mounting piece 25 is fixed to the inner wall of the outer shell 14 by bolts, and the other end is fastened to the outer circumference of the outer tube 21 by a semi-circular clamping structure. In this embodiment, all 12 outer tubes 21 are fixed by independent mounting pieces 25. This distributed fixing method can effectively suppress the deformation stress caused by thermal expansion and contraction of the pipeline and prevent the S-shaped pipeline from generating mechanical vibration noise. At the same time, the mounting piece 25 is made of a metal material with good conductivity, so that it can provide mechanical support while serving as part of the grounding protection path.

[0050] One U-shaped pipe 20 located at the edge of the S-shaped pipe array has its end away from the outer pipe 21 connected to the inlet pipe 22, and the other U-shaped pipe 20 on the opposite edge has its end away from the outer pipe 21 connected to the outlet pipe 23; the front end of the inlet pipe 22 is connected to a miniature booster pump 16, which is mounted on the inner wall of the housing 14 by a bracket to provide circulation power.

[0051] The water pump 16 is further connected to the water inlet pipe 26, which passes through the inner cavity of the water tank 10 to draw water from the tank; the water outlet pipe 23 is equipped with a drain pipe 24, which extends out to the outside of the water tank 10 to provide water supply to the user.

[0052] The heating component adopts a water-electricity separation sleeve structure design. The heating component includes an inner tube 30, which is a blind tube structure with one end open and the other end closed. The material is corrosion-resistant stainless steel.

[0053] The inner tube 30 has a flared flange 31 at its open end. The flange 31 is embedded in the placement groove 211 at the end of the outer tube 21. The U-shaped pipe 20 and the outer tube 21 are locked together by bolts to clamp and fix the flange 31 and press the first sealing ring 40 in the placement groove 211, thereby effectively preventing water leakage.

[0054] Several water outlet holes 32 are evenly distributed on the circumference of the flange 31, so that the U-shaped pipe 20 is connected to the annular water passage inside the outer pipe 21, and the water flow is fully guaranteed to pass through the space between the outer wall of the inner pipe 30 and the inner wall of the outer pipe 21.

[0055] To improve heat exchange efficiency and suppress scaling, the outer wall of the inner tube 30 is designed with a spiral plate 33, which is fixed by welding or integral molding process. When water flows through the annular water passage, the spiral plate 33 can effectively induce the water flow to form spiral turbulence, thereby destroying the laminar boundary layer, greatly improving the heat transfer coefficient, and reducing the adhesion of scale on the tube wall through the turbulence effect, which helps to maintain heat exchange performance.

[0056] The interior of the inner tube 30 serves as a dry-burning zone to house the heating element. The space between the inner tube 30 and the heating element is filled with a high-efficiency thermally conductive medium 34, which is preferably made of high-density insulating magnesium oxide powder or high-performance thermally conductive silicon powder.

[0057] The heat-conducting medium 34 not only ensures that heat is quickly transferred to the wall of the inner tube 30, but also provides reliable electrical insulation performance.

[0058] Fluid transport and spiral heat exchange principle: When the user turns on the water demand, the micro booster pump 16 starts, draws out the cold water in the water tank 10 and transports it to the S-shaped water supply pipeline. The water flows through the inlet pipe 22 into the annular flow channel composed of the outer pipe 21 and the inner pipe 30. During this process, the spiral plate 33 fixedly installed on the outer wall of the inner pipe 30 transforms the fluid from a straight laminar flow to a high-speed rotating spiral turbulent flow.

[0059] This forced turbulence effectively disrupts the fluid boundary layer on the pipe wall surface, significantly reducing thermal resistance. This allows the heat generated by the heating element inside the inner pipe 30 to be rapidly transferred to the water flow through the heat transfer medium 34. At the same time, the high-speed rotating water flow continuously washes the pipe wall surface, effectively preventing the deposition of calcium and magnesium ions in the high-temperature area, thereby achieving the self-cleaning and scale-preventing function of the pipe.

[0060] In this embodiment, the 12 external tubes 21 have internal heating elements divided into three power gradients from the inlet to the outlet according to the fluid flow direction. Each gradient contains 4 heating units to achieve a graded heating effect.

[0061] Water inlet area (pipes 1 to 4): Equipped with low-power ceramic heating rods 35, such as a single rod with a rated power of 500W. This area is mainly responsible for preheating cold water, which aims to reduce the temperature shock when cold water enters the heating pipe, reduce the risk of scaling in the equipment, and improve the stability of system operation.

[0062] The middle area (tubes 5 to 8): Equipped with medium-power ceramic heating rods 36, such as a single rod with a rated power of 800W, this core heating area is responsible for providing the main heat and significantly increasing the temperature of the fluid.

[0063] Water outlet area (pipes 9 to 12): Equipped with high-power ceramic heating rods 37, such as a single rated power of 1200W. This area is close to the water outlet and has a fast response capability. It achieves precise constant temperature control through linkage with the PID control system and supports the "instant hot water" function.

[0064] A flow sensor (not shown) was installed at the inlet pipe 22, while an immersion NTC temperature sensor (not shown) was installed at the outlet pipe 23.

[0065] The control panel 12 flexibly controls the start-stop combination of three different power heating elements based on real-time detected flow data and temperature rise requirements. For example, in the low-flow handwashing mode, only the high-power ceramic heating element 37 in the water outlet section is activated; while in the high-flow shower mode, all heating sections are fully activated. In addition, a three-way valve and a pressure relief valve (not shown in the figure) are installed at the end of the S-shaped pipe. When the internal pressure of the system exceeds 0.8MPa, the pressure relief valve will automatically open to release the pressure into the water tank 10 to ensure the safety of system operation.

[0066] Segmented gradient heating control logic: This device implements a three-level gradient heating strategy, including three stages: "low temperature preheating, medium temperature rise, and high temperature constant temperature".

[0067] Preheating stage (sections 1 to 4): Cold water first enters the inlet pipe section and is gently preheated by a low-power ceramic heating rod 35. This heating rod operates at a low surface power density to avoid excessive thermal stress deformation of the inner tube 30 caused by instantaneous high temperature.

[0068] Heating stage (sections 5 to 8): The preheated water flows into the middle section, where the medium-power ceramic heating rod 36 operates at full power to quickly increase the water temperature and achieve core temperature enhancement.

[0069] Constant temperature stage (sections 9 to 12): When water flows through the outlet pipe section, the high-power ceramic heating rod 37 is used for precise temperature control. This heating rod is driven by a PID control algorithm. Combined with the real-time feedback from the NTC temperature sensor of the outlet pipe 23 on the control panel 12, the power output frequency is adjusted to ensure stable water temperature, avoid fluctuations, and accurately maintain a constant outlet water temperature.

[0070] The heating rod is connected to a high-temperature resistant wire 38 at the end. A wire outlet pipe 201 extending outward is provided at the bend of the U-shaped pipe 20. The wire 38 is introduced into the internal space of the outer casing 14 through the wire outlet pipe 201. To ensure electrical sealing performance, an end cap 39 is installed at the opening of the inner tube 30.

[0071] The end cap 39 is designed in a stepped shape and extends into the interior of the outlet tube 201. The wire 38 is led out through the reserved channel of the end cap 39.

[0072] A second sealing ring 41 is fitted onto the outside of the end of the outlet pipe 201, and a sealing cap 42 is connected by threads; tightening the sealing cap 42 can press the second sealing ring 41 and the end cap 39, thereby effectively preventing water vapor from leaking along the conductor 38.

[0073] To ensure electrical safety in the multi-pipe segmented structure, a complete grounding assembly is designed inside the housing 14, which includes a grounding busbar 50 fixed on the inner wall of the housing 14 along the S-shaped pipe arrangement direction.

[0074] The grounding busbar 50 is made of tin-plated copper and is fixed at both ends by insulating supports 51 to achieve physical insulation from the bottom plate of the outer casing 14, thereby avoiding interference from stray currents.

[0075] The surface of each outer pipe 21, the metal parts of the inlet pipe 22 and the outlet pipe 23 are all fixedly installed with L-shaped connectors 52 by welding or clamping. The grounding connection is carried out in the following strict order to ensure low resistance contact.

[0076] Using the first bolt assembly 53, which includes a bolt, a spring washer, and an internal toothed locking washer, the first terminal 54 (O-type terminal A) to which one end of the yellow-green wire 55 is crimped is securely locked onto the connector 52.

[0077] The yellow-green conductor 55 uses multi-strand copper core wire with a cross-sectional area greater than 5mm², which has a certain degree of flexibility and can compensate for the displacement of the pipeline caused by thermal expansion and contraction.

[0078] The second terminal 56 (O-type terminal B) crimped to the other end of the yellow-green wire 55 is securely connected to the corresponding screw hole on the grounding busbar 50 via the second bolt group 57.

[0079] The grounding wires of the 12 outer tubes 21 converge sequentially at the grounding busbar 50 and are finally connected to the power grounding port through the main grounding wire.

[0080] When any section of the inner pipe 30 is damaged and leaks current, the leakage current is conducted to the outer pipe 21 through the water flow, and is quickly conducted to the ground through the low-impedance grounding busbar 50, thereby triggering the external leakage protection switch to trip and achieving active safety protection.

[0081] After the inner tube 30 is damaged, the leaking water or current will be confined to the closed pipe system formed by the outer tube 21, and will not directly splash onto the circuit board, water pump 24 or other live connectors inside the outer casing 14, effectively preventing large-scale short circuits inside the machine.

[0082] Protection principle: Under normal working conditions, the outer metal tube 21 always maintains zero potential. When the inner tube 30 is damaged due to long-term use, resulting in failure of electrical insulation performance, leakage current will quickly enter the water in the annular channel and then be conducted to the outer metal tube 21.

[0083] Since the outer tube 21 is reliably connected to the grounding busbar 50 through the low-impedance yellow-green wire 55, the leakage current will preferentially flow to the ground through the grounding busbar 50 and will not endanger human safety.

[0084] At the same time, the leakage current in the circuit increases significantly in an instant, thereby forcibly triggering the leakage protection switch of the external power supply to trip and cut off the power within 0.1 seconds, further realizing the secondary physical protection mechanism after the failure of "water and electricity separation".

[0085] The specific steps for using this invention are as follows:

[0086] Upon initial use, the user fills the water tank 10 with water through the water inlet pipe 26. After powering on, the control panel 12 automatically performs a system self-test, including checking the grounding connectivity and the status of various sensors.

[0087] Users can select a water usage mode or set a target water temperature via the control panel 12, such as setting the temperature to 42°C to start the shower mode.

[0088] When the user-set target temperature is low or the water flow rate is low, and the flow sensor detects a value below the set threshold, the system determines it to be in handwashing mode. In this case, the controller only activates the high-power ceramic heating element 37 in the outlet section to achieve rapid heating using its rapid heating characteristics, while shutting off the heating elements in the inlet and intermediate sections to save energy.

[0089] When the user sets a higher temperature or detects a large flow rate, the system determines that it is in shower mode. The controller then sequentially activates the heating elements in the inlet, middle, and outlet sections, and operates them at full power to ensure a continuous supply of hot water.

[0090] The water pump 16 starts according to the user-defined mode, pushing the water to circulate and heat within the S-shaped pipe. During operation, the system dynamically adjusts by monitoring the outlet water temperature in real time: if the outlet water temperature is lower than the set value, the PID algorithm will increase the duty cycle or output power of the heating rod in the outlet section; if the outlet water temperature is higher than the set value, the system will reduce the final heating power or pause the operation of some heating rods; if the system pressure exceeds 0.8MPa (e.g., if the outlet pipe 23 is detected to be blocked), the pressure relief valve will automatically open, returning the high-pressure water to the water tank 10 to prevent the pipe from bursting due to excessive pressure.

[0091] After use, the user turns off the water outlet switch. Once the flow sensor detects that the water flow has stopped, the control panel 12 immediately cuts off the power to all heating elements. At the same time, the water pump 16 runs for a set time (e.g., 5 seconds) to remove any remaining heat in the pipes and prevent residual heat from damaging the inner pipe 30 after shutdown.

[0092] In addition, users should regularly refer to the prompts on the control panel 12 and perform inspections or maintenance based on the grounding component structure when a fault code occurs.

[0093] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A segmented heating mechanism, characterized in that, It includes an outer shell (14) and a cover plate (15). The outer shell (14) is provided with a plurality of outer tubes (21). An inner tube (30) is inserted inside the outer tubes (21). Adjacent outer tubes (21) are connected by connecting pipes to form a water supply circuit. A water passage is formed between the inner wall of the inner tube (30) and the inner wall of the outer tube (21), and a spiral plate (33) for turbulence is provided on the outer wall of the inner tube (30) along the axial direction. The inner tube (30) is filled with a heat-conducting medium (34) and equipped with a heating component. The heating component is divided into at least two heating sections with different power levels along the water flow direction of the water supply circuit.

2. The segmented heating mechanism according to claim 1, characterized in that, The outer pipes (21) are arranged in an array, and the connecting pipe is a U-shaped pipe (20). The U-shaped pipe (20) connects the ends of two adjacent outer pipes (21) to form an S-shaped meandering water conveyance loop. A first sealing ring (40) is provided at the connection between the U-shaped pipe (20) and the outer pipe (21). The outer circumferential surface of the outer tube (21) is fixedly supported by several mounting parts (25).

3. The segmented heating mechanism according to claim 1, characterized in that, The inner tube (30) has an outwardly flared flange (31) at its open end, and the outer tube (21) has a placement groove (211) at its end; the flange (31) is embedded in the placement groove (211); The flange (31) has an outlet hole (32) on its circumference that connects the U-shaped pipe (20) and the water passage.

4. The segmented heating mechanism according to claim 1, characterized in that, The power levels of the heating components increase sequentially from the inlet to the outlet along the water flow direction, including a low-power heating section for preheating, a medium-power heating section for heating, and a high-power heating section for maintaining a constant temperature.

5. A segmented heating mechanism according to claim 4, characterized in that, The heating components include a low-power ceramic heating rod (35), a medium-power ceramic heating rod (36), and a high-power ceramic heating rod (37).

6. A segmented heating mechanism according to claim 2, characterized in that, The U-shaped pipe (20) has an outwardly extending outlet pipe (201) at the bend. The inner pipe (30) has an end cap (39) extending into the outlet pipe (201) at the open end. A second sealing ring (41) is provided at the connection between the outlet pipe (201) and the end cap (39). The heating assembly is connected to a wire (38), which passes through the end cap (39) and exits from the outlet pipe (201); The end of the outlet tube (201) is threadedly connected to a sealing cap (42), and the sealing cap (42) is provided with a sealing ring for sealing the wire (38).

7. A segmented heating mechanism according to claim 1, characterized in that, The grounding assembly includes an external grounding busbar (50), and a connecting piece (52) is fixed on the surface of the outer tube (21). The connecting piece (52) is electrically connected to the grounding busbar (50) through a yellow-green wire (55). The grounding busbar (50) is fixedly installed by an insulating support (51).

8. A segmented heating mechanism according to claim 7, characterized in that, The yellow-green wire (55) has a first terminal (54) and a second terminal (56) at both ends. The first terminal (54) is connected to the terminal block (52) through the first bolt group (53), and the second terminal (56) is connected to the grounding busbar (50) through the second bolt group (57).

9. An electric water heater, comprising a water tank (10), a tank cover (11), a water pump (16), and a casing (14), characterized in that, It also includes a segmented heating mechanism as described in any one of claims 1 to 8; the segmented heating mechanism is installed in the mounting groove (13) of the housing (14), the input end of the water pump (16) is connected to the water tank (10) through the water supply pipe (26), and the output end of the water pump (16) is connected to the water inlet pipe (22) of the segmented heating mechanism.

10. An electric water heater according to claim 9, characterized in that, The segmented heating mechanism is provided with a water outlet pipe (23), and the drain pipe (24) connected to the water outlet pipe (23) extends to the outside of the water tank (10); A temperature sensor is provided on the outlet pipe (23), and a flow sensor is provided on the inlet pipe (22); It also includes a control panel (12), which independently controls the start and stop of heating sections with different power levels based on signals from the flow sensor and the temperature sensor.

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