An electric heating tube with a self-cleaning structure

Abstract

This invention relates to the field of electric heating element technology, specifically to an electric heating element with a self-cleaning structure. It includes a water heater cylinder and an electric heating element body disposed within the cylinder. A hot water pipe interface and a cold water pipe interface are fixedly connected to the lower side of the outer surface of the water heater cylinder. A cleaning mechanism movable along the axial direction is provided on the exterior of the electric heating element body, and a driving mechanism is provided on the exterior of the water heater cylinder. This invention achieves a two-stage treatment mode of first breaking down and then scraping the hard scale layer by setting a crushing component in front of the scraping component's travel direction. The crushing component, through the rolling and crushing of rollers and crushing teeth, forms multiple stress concentration points on the scale layer surface, causing micro-cracks in the scale layer and breaking it into blocks or particles. This significantly reduces the adhesion and overall strength of the scale layer to the heating element surface, thereby significantly reducing the resistance when the subsequent scraping component moves, and preventing the scraping component from deforming or being damaged due to hard scraping.

Description

Technical Field

[0001] This invention relates to the field of electric heating element technology, specifically to an electric heating element with a self-cleaning structure, which is particularly suitable for the automatic cleaning and descaling of the surface of electric heating elements in water heating equipment such as storage water heaters and electric boilers. Background Technology

[0002] An electric heating element is a tubular electric heating element, typically consisting of a metal tube shell, a spiral resistance wire inside the tube, and crystalline magnesium oxide powder filling the space between the resistance wire and the metal tube. Electric heating elements offer advantages such as high thermal efficiency, simple structure, and long service life, and are widely used in water heating equipment such as water heaters, electric kettles, and electric boilers.

[0003] During long-term use of appliances such as water heaters, scale inevitably forms on the surface of electric heating elements. The formation mechanism of scale is as follows: calcium and magnesium ions dissolved in water undergo a chemical reaction under heating conditions to produce precipitates such as calcium carbonate and magnesium carbonate, which are insoluble in water. These precipitates adhere to the surface of the heating element and gradually accumulate to form a hard scale layer.

[0004] The presence of scale can cause a series of serious problems: First, it reduces heating efficiency. The thermal conductivity of limescale is only a fraction of that of metal, sometimes even a hundredth. The presence of limescale acts as an insulation barrier between the heating element and the water, preventing heat from being effectively transferred to the water, thus prolonging heating time and significantly increasing energy consumption. It is estimated that when the limescale thickness reaches 1 mm, heating efficiency can decrease by 15% to 20%.

[0005] Secondly, it can damage the heating element. The thermal expansion coefficient of the scale layer differs from that of the metal pipe. During repeated heating and cooling, thermal stress is generated between the scale layer and the pipe wall, leading to localized overheating, oxidation, or even cracking of the pipe wall. At the same time, the temperature of the metal pipe wall under the scale layer rises due to heat accumulation, accelerating the aging of the resistance wire and reducing the insulation performance of the magnesium oxide powder. In severe cases, this can cause the heating element to burn out.

[0006] Third, it pollutes water quality. The loose and porous structure of scale provides a breeding ground for bacteria and microorganisms. Scale inside water heaters that are not cleaned for a long time may contain a large number of bacteria, posing a potential threat to users' health.

[0007] Fourth, it increases maintenance costs. Users need to regularly hire professionals to disassemble the water heater for descaling and cleaning, which is cumbersome, expensive, and frequent disassembly may damage the seals and cause leaks.

[0008] Currently, there are some electric heating element designs on the market with self-cleaning functions. These include coating the heating element with a hydrophobic coating to reduce scale buildup, or installing a scraper ring on the outside of the heating element for manual or electric scraping to remove scale. However, existing technologies have the following shortcomings: Firstly, when relying solely on the scraping ring to directly remove hard scale, the scale layer has high hardness and strong adhesion, requiring the scraping ring to overcome significant resistance. This can easily lead to deformation of the scraping ring and overload of the drive mechanism. Furthermore, the hard scraping of the heating tube surface by the scraping ring may cause scratches or damage to the tube wall, which in turn accelerates the subsequent adhesion of scale.

[0009] Secondly, the existing solution does not have a pre-crushing structure for hard scale, which cannot effectively reduce scraping resistance and the scale removal effect is not ideal. Especially for heating pipes with a thick scale layer, the scraping ring often cannot remove it completely in one go.

[0010] Third, the existing solution lacks a self-cleaning mechanism for scale stuck between the crushing teeth. During the crushing process, fine scale particles are easily embedded in the gaps between the teeth, causing the crushing efficiency to gradually decrease.

[0011] Therefore, developing a self-cleaning structure that can efficiently and safely remove scale from the surface of electric heating tubes is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0012] The purpose of this invention is to provide an electric heating tube with a self-cleaning structure, which aims to solve the technical problems in the prior art of electric heating tubes, such as the difficulty in efficiently removing scale from the surface, the easy damage to the heating tube by direct scraping, and the easy jamming and failure of the crushing mechanism.

[0013] To achieve the above objectives, the present invention provides the following technical solution: an electric heating tube with a self-cleaning structure, comprising a water heater cylinder and an electric heating tube body disposed inside the water heater cylinder, wherein a hot water pipe interface and a cold water pipe interface are fixedly connected to the lower side of the outer surface of the water heater cylinder, a cleaning mechanism movable along its axial direction is provided outside the electric heating tube body, and a driving mechanism is provided outside the water heater cylinder, wherein the output end of the driving mechanism extends into the interior of the water heater cylinder and is connected to the cleaning mechanism in a transmission manner.

[0014] The cleaning mechanism includes a scraping component that slides against the outer wall of the electric heating tube body and has a scraping function, and a crushing component located in front of the scraping component in the direction of travel for pre-crushing the hard scale layer on the surface of the electric heating tube body.

[0015] As the scraping component moves along with the scraping component, the crushing component applies concentrated stress to the scale layer on the surface of the electric heating tube body through rolling and crushing, causing it to crack and break. This reduces the scraping resistance between the scraping component and the electric heating tube body and prevents the scraping component from causing tearing or surface damage to the electric heating tube body due to hard scraping of hard scale.

[0016] Furthermore, the driving mechanism is an electric push rod, which is fixedly connected to the side of the water heater tank away from the control panel, and its output end extends into the interior of the water heater tank and is connected to the cleaning mechanism via transmission.

[0017] Furthermore, the scraping assembly includes a drive disc fixedly connected to the output end of the drive mechanism, a cleaning ring sleeved on the outside of the electric heating tube body, and a connecting rod connecting the drive disc and the cleaning ring; the cleaning ring is made of ceramic material, and its inner wall is in contact with the outer wall of the electric heating tube body, and is used to scrape and clean the surface of the electric heating tube body during movement.

[0018] Furthermore, the crushing assembly includes fixed brackets symmetrically fixedly connected to the side of the cleaning ring, a roller rotatably connected between the two fixed brackets, and multiple crushing teeth fixedly connected at equal intervals in a ring on the surface of the roller; the ends of the crushing teeth are reserved with a gap between them and the surface of the electric heating tube body, for crushing the scale layer when the roller rolls.

[0019] Furthermore, the crushing assembly also includes an elastic sheet made of elastic metal material. One end of the elastic sheet is fixedly connected to the fixed bracket, and the other end extends between two adjacent crushing teeth. During the rolling of the roller, the elastic sheet is continuously squeezed and deformed by the crushing teeth and reset to generate vibration, which is used to remove scale particles stuck in the gap between the crushing teeth, and at the same time transmits the vibration to the surface of the electric heating tube body to accelerate the peeling of scale.

[0020] Furthermore, the electric heating tube body includes an annular heating tube and multiple electric heating tube bodies distributed equidistantly on the side of the annular heating tube. The electric heating tube bodies are connected to the annular heating tube, and a control panel is fixedly connected to the other end of the annular heating tube. The control panel is embedded in one side of the water heater cylinder, and a sealing ring is provided at the connection between the two.

[0021] Furthermore, the control panel is equipped with a control module, and the water heater tank is equipped with a temperature sensor and a liquid level sensor. Both the temperature sensor and the liquid level sensor are electrically connected to the control module. The control module is electrically connected to the drive mechanism and is used to control the start, stop and extension stroke of the drive mechanism according to the usage time, the degree of scale accumulation or user instructions.

[0022] Furthermore, a hot water pipe interface and a cold water pipe interface are fixedly connected to the lower side of the outer surface of the water heater cylinder, and an anti-corrosion inner liner is provided on the inner wall of the water heater cylinder.

[0023] Furthermore, the cleaning mechanism is provided in three sets, each corresponding to one of the three electric heating tube bodies. The three sets of cleaning mechanisms are linked to the output end of the drive mechanism through the same drive disk.

[0024] Compared with the prior art, the beneficial effects of the present invention are: First, this invention achieves a two-stage processing mode of first breaking down and then scraping the hard scale layer by setting a crushing component on the front side of the scraping component's travel direction. The crushing component, through the rolling and crushing of rollers and crushing teeth, forms multiple stress concentration points on the surface of the scale layer, causing micro-cracks in the scale layer and breaking it into blocks or particles. This significantly reduces the adhesion and overall strength of the scale layer to the heating pipe surface, thereby significantly reducing the resistance when the subsequent scraping component moves, and preventing the scraping component from deforming or being damaged due to hard scraping.

[0025] Secondly, in this invention, the crushing component and the scraping component are integrated into the same cleaning mechanism and driven by the same drive mechanism, resulting in a compact structure and reliable linkage. After the crushing component crushes the material, the scraping component immediately follows up to scrape it off. The two work together to achieve thorough and efficient descaling.

[0026] Third, the present invention incorporates an elastic sheet structure in the crushing component. This elastic sheet periodically collides with the crushing teeth during the rotation of the roller, generating high-frequency micro-vibrations. This vibration serves two purposes: firstly, it dislodges scale particles stuck between the crushing teeth, maintaining the cleanliness of the crushing teeth and improving crushing efficiency; secondly, the vibration is transmitted through the roller to the surface of the electric heating tube, helping to further loosen and peel off the already cracked scale layer, achieving vibration-assisted descaling and improving the overall descaling effect.

[0027] Fourth, the present invention uses a cleaning ring made of ceramic material. Ceramic has the characteristics of high hardness, good wear resistance, high temperature resistance and strong chemical stability. It is not easily worn during long-term friction with scale and will not chemically react with the water in the water heater tank, resulting in a long service life.

[0028] Fifth, the present invention can automatically start the cleaning program according to the descaling cycle set by the user or the operating parameters detected by the temperature sensor and liquid level sensor through the control module in the control panel, realizing intelligent and automated self-cleaning function without manual intervention, which greatly reduces the maintenance burden of users. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is an overall structural view of the present invention; Figure 2 Partial cross-sectional view of the overall structure of the present invention Figure 1 ; Figure 3 Partial cross-sectional view of the overall structure of the present invention Figure 2 ; Figure 4 This is a diagram showing the assembly of the cleaning mechanism and the main body of the heating element according to the present invention; Figure 5 This is a rear view of the cleaning mechanism and the main body of the heating element of the present invention; Figure 6 For the present invention Figure 5 Enlarged diagram of point A in the middle.

[0031] Explanation of reference numerals in the attached figures: 1. Water heater tank; 2. Electric push rod; 3. Control panel; 4. Hot water pipe interface; 5. Cold water pipe interface; 6. Electric heating element body; 7. Drive plate; 8. Annular heating element; 9. Cleaning mechanism; 10. Crushing component; 11. Cleaning ring; 12. Fixing bracket; 13. Roller; 14. Crushing teeth; 15. Connecting rod; 16. Elastic sheet. Detailed Implementation

[0032] 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.

[0033] Please see Figures 1 to 6 The present invention provides a technical solution: an electric heating tube with a self-cleaning structure.

[0034] I. Overall Structure

[0035] like Figure 1 , Figure 2 and Figure 3As shown, the electric heating element includes a water heater cylinder 1. The water heater cylinder 1 is a cylindrical, hollow, sealed container used to store water to be heated. A hot water pipe interface 4 and a cold water pipe interface 5 are fixedly connected to the lower outer surface of the water heater cylinder 1, used for outputting hot water and inputting cold water, respectively. The inner wall of the water heater cylinder 1 is provided with a corrosion-resistant inner liner (not shown in the figure), such as an enamel liner or a stainless steel liner, to prevent water from corroding the cylinder.

[0036] The water heater cylinder 1 houses an electric heating element body 6. The electric heating element body 6 includes a ring-shaped heating element 8 and multiple electric heating element bodies evenly distributed around the side of the ring-shaped heating element 8. In this embodiment, there are three electric heating element bodies, evenly distributed at a 120-degree angle. Each electric heating element body has a U-shaped or straight rod-shaped structure, with one end connected to the ring-shaped heating element 8 and the other end being a free end. A control panel 3 is fixedly connected to the other end of the ring-shaped heating element 8 (i.e., the end furthest from the electric heating element body). The control panel 3 is embedded in one end cap of the water heater cylinder 1, and a sealing ring (not shown in the figure) is provided at the connection point to prevent leakage.

[0037] The control panel 3 contains a control module, which can be a microcontroller or a PLC controller. The water heater tank 1 also contains a temperature sensor and a level sensor (not shown in the figure), both electrically connected to the control module. These sensors monitor the water temperature and level in the water heater tank 1 in real time and feed the signals back to the control module.

[0038] II. Drive Mechanism

[0039] like Figure 2 and Figure 3 As shown, an electric actuator 2 is fixedly connected to the side of the water heater cylinder 1 away from the control panel 3 (i.e., the end opposite to the annular heating element 8). The housing of the electric actuator 2 is fixedly connected to the end cap of the water heater cylinder 1 via a flange and bolts, and its output shaft passes through the end cap and extends into the interior of the water heater cylinder 1. A sliding sealing ring (not shown in the figure) is provided between the output shaft of the electric actuator 2 and the end cap of the water heater cylinder 1 to ensure sealing. The electric actuator 2 is electrically connected to the control module inside the control panel 3, and its extension and retraction movements and stroke are controlled by the control module.

[0040] III. Cleanup Organization

[0041] like Figure 3 , Figure 4 and Figure 5 As shown, a cleaning mechanism 9 is provided on the outside of the heating element body 6. The cleaning mechanism 9 includes a drive disc 7, a cleaning ring 11, a connecting rod 15, and a breaking component 10.

[0042] The drive disk 7 is located inside the space enclosed by the three heating tube bodies 6. The drive disk 7 can be disc-shaped or star-shaped. The output shaft of the electric push rod 2 passes through the interior of the annular heating tube 8 (the annular heating tube 8 has a through hole in its center) and is fixedly connected to the center of the drive disk 7. Therefore, when the electric push rod 2 extends or retracts, the drive disk 7 moves axially accordingly.

[0043] Each heating element body 6 is fitted with a cleaning ring 11. The cleaning ring 11 is annular, and its inner diameter is equal to the outer diameter of the heating element body 6, allowing the cleaning ring 11 to slide against the outer wall of the heating element body 6. The cleaning ring 11 is made of ceramic material, such as alumina ceramic or zirconia ceramic, which has high hardness, high wear resistance, and good heat resistance. The inner wall of the cleaning ring 11 may be further coated with a wear-resistant coating.

[0044] The drive disc 7 is fixedly connected to each cleaning ring 11 via connecting rods 15. Specifically, one end of the connecting rod 15 is fixedly connected to the side of the drive disc 7, and the other end is fixedly connected to the side of the cleaning ring 11. The number of connecting rods 15 is the same as the number of heating element bodies 6, which is three. When the drive disc 7 is driven to move by the electric push rod 2, all cleaning rings 11 are moved synchronously along the axial direction of the heating element body 6 via the connecting rods 15.

[0045] IV. Crushing Components

[0046] like Figure 4 , Figure 5 and Figure 6 As shown, each cleaning ring 11 has a set of crushing components 10 on its side (i.e., the side facing the direction of travel of the electric push rod 2). The number of crushing components 10 is the same as that of the cleaning ring 11, which is three sets, and each set of crushing components 10 is located in front of the corresponding cleaning ring 11 in the direction of travel.

[0047] like Figure 6 As shown, the crushing assembly 10 includes the following sub-components: Two fixed brackets 12 are symmetrically fixedly connected to the sides of the cleaning ring 11. The fixed brackets 12 are plate-shaped and extend along the axial direction of the heating tube body 6.

[0048] A roller 13 is rotatably connected between two fixed supports 12. The axis of the roller 13 is parallel to the axis of the heating element body 6, allowing the roller 13 to roll on the surface of the heating element body 6. The roller 13 can be made of metal or ceramic.

[0049] Multiple breaking teeth 14 are fixedly connected in a ring at equal intervals to the outer circumferential surface of the roller 13. The cross-section of the breaking teeth 14 is triangular or trapezoidal, with its tips facing the surface of the heating element body 6. A small gap is reserved between the end of the breaking teeth 14 and the surface of the heating element body 6. The size of this gap is set according to the expected thickness of the scale layer, typically 0.1 mm to 0.5 mm. This design allows the breaking teeth 14 to apply pressure to and break the scale layer when the roller 13 rolls, but without directly contacting the heating element surface, thus avoiding scratches.

[0050] An elastic plate 16 is made of an elastic metal material (such as spring steel). One end of the elastic plate 16 is fixedly connected to one of the fixed supports 12, and the other end is a free end. This free end contacts the surface of the roller 13 in its natural state and extends into the gap between two adjacent breaking teeth 14. The elastic plate 16 is generally arc-shaped and has a certain preload.

[0051] V. Working Principle

[0052] The working principle of the electric heating tube with self-cleaning structure of the present invention is as follows: Normal heating operation: Control panel 3 powers on the electric heating element body 6, causing the resistance wire to heat up. The heat is transferred to the water in the water heater tank 1 through the metal wall of the electric heating element body 6, thus heating the water. Temperature and level sensors monitor the water temperature and level in real time, and the control module controls the heating to start and stop according to the set values.

[0053] Self-cleaning and descaling function: After the electric heating element body 6 has been used for a period of time, scale will accumulate on its surface. Users can manually start the self-cleaning program through the control panel 3, or the control module can automatically start it according to the preset usage time (e.g., run automatically once every 30 days).

[0054] Upon startup, the control module controls the electric push rod 2 to begin operation. The output shaft of the electric push rod 2 extends, pushing the drive disc 7 to move away from the electric push rod 2 (i.e., towards the control panel 3). The drive disc 7 drives the cleaning ring 11 to move synchronously via the connecting rod 15.

[0055] During the movement of the cleaning ring 11, the crushing component 10, located in front of the cleaning ring 11, first contacts the scale layer on the surface of the heating element body 6. As the cleaning ring 11 moves, the roller 13 rolls on the surface of the heating element body 6. The crushing teeth 14 on the surface of the roller 13 apply concentrated compressive stress to the scale layer, causing cracks to form at the tips of the crushing teeth 14. The cracks propagate, causing the scale layer to break into small pieces or particles. This process destroys the originally intact and hard scale layer, significantly reducing its adhesion.

[0056] As the roller 13 rolls, the elastic plate 16 is continuously deformed by the rotating breaking teeth 14. After the breaking teeth 14 have passed, the elastic plate 16 quickly resets and impacts the next breaking tooth 14, generating high-frequency micro-vibrations. This vibration has two functions: first, it dislodges scale particles that may be embedded in the gaps between the breaking teeth 14, preventing the teeth from clogging; second, the vibration is transmitted through the roller 13 to the surface of the heating element body 6, further promoting the loosening and peeling of the already cracked scale layer.

[0057] After pre-crushing by the crushing component 10, the cleaning ring 11 moves immediately afterward. The inner wall of the cleaning ring 11 adheres to the surface of the heating element body 6, scraping away the loosened residual scale. Because the scale layer has been pre-crushed, the resistance encountered by the cleaning ring 11 during movement is significantly reduced, preventing scratches or damage to the surface of the heating element body 6.

[0058] After the electric push rod 2 completes a full stroke (moving from one end to the other), the control module can control its reverse retraction to reset the cleaning mechanism 9. Multiple reciprocating movements can also be set to enhance the descaling effect. Debris detached during the descaling process is deposited at the bottom of the water heater tank 1 with the water flow, and can be periodically discharged by the user through the drain port.

[0059] Once descaling is complete, the control module stops the electric push rod 2 from working, and the electric heating tube body 6 resumes normal heating.

[0060] VI. Other Implementation Methods

[0061] In other embodiments, the drive mechanism can also use a hydraulic cylinder, a linear motor, or a screw and nut mechanism instead of the electric push rod 2, as long as it can achieve linear reciprocating motion.

[0062] In other embodiments, the cleaning ring 11 can be made of silicon nitride ceramic or zirconium oxide ceramic, which also have high hardness and wear resistance.

[0063] In other embodiments, the number of crushing teeth 14 can be adjusted according to the diameter of the heating tube body 6 and the hardness of the scale. The more teeth there are, the finer the crushing effect.

[0064] In other embodiments, multiple elastic sheets 16 may be provided and distributed at different angular positions of the roller 13 to enhance the vibration effect.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric heating element with a self-cleaning structure, comprising a water heater cylinder (1) and an electric heating element body (6) disposed within the water heater cylinder (1), characterized in that, The electric heating tube body (6) is provided with a cleaning mechanism (9) that can move along its axial direction. The water heater cylinder (1) is provided with a driving mechanism (2). The output end of the driving mechanism (2) extends into the water heater cylinder (1) and is connected to the cleaning mechanism (9) in a transmission manner. The cleaning mechanism (9) includes a scraping component (11) that slides against the outer wall of the electric heating tube body (6) and has a scraping function, and a crushing component (10) that is located in front of the scraping component (11) in the direction of travel and is used to pre-crush the hard scale layer on the surface of the electric heating tube body (6). As the scraping component (10) moves with the scraping component (11), it applies concentrated stress to the scale layer on the surface of the electric heating tube body (6) by rolling and crushing, causing it to crack and break. This reduces the scraping resistance between the scraping component (11) and the electric heating tube body (6) and prevents the scraping component (11) from causing damage to the electric heating tube body (6) due to hard scraping of hard scale.

2. An electric heating tube with a self-cleaning structure according to claim 1, characterized in that, The driving mechanism is an electric push rod (2), which is fixedly connected to the side of the water heater cylinder (1) away from the control panel (3), and its output end extends into the interior of the water heater cylinder (1) and is connected to the cleaning mechanism (9) in a transmission connection.

3. An electric heating tube with a self-cleaning structure according to claim 1, characterized in that, The scraping assembly includes a drive disk (7) fixedly connected to the output end of the drive mechanism, a cleaning ring (11) sleeved on the outside of the electric heating tube body (6), and a connecting rod (15) connecting the drive disk (7) and the cleaning ring (11). The cleaning ring (11) is made of ceramic material, and its inner wall is attached to the outer wall of the electric heating tube body (6) for scraping and cleaning the surface of the electric heating tube body (6) during movement.

4. An electric heating tube with a self-cleaning structure according to claim 1, characterized in that, The crushing component (10) includes a fixed bracket (12) symmetrically fixedly connected to the side of the cleaning ring (11), a roller (13) rotatably connected between the two fixed brackets (12), and a plurality of crushing teeth (14) circumferentially fixedly connected to the surface of the roller (13); the ends of the crushing teeth (14) are reserved with the surface of the electric heating tube body (6) for crushing the scale layer when the roller (13) rolls.

5. An electric heating tube with a self-cleaning structure according to claim 4, characterized in that, The crushing assembly (10) also includes an elastic sheet (16) made of elastic metal material. One end of the elastic sheet (16) is fixedly connected to the fixed bracket (12), and the other end extends to the space between two adjacent crushing teeth (14). During the rolling of the roller (13), the elastic sheet (16) is continuously squeezed and deformed by the crushing teeth (14) and reset to generate vibration, which is used to remove scale particles stuck in the gap of the crushing teeth (14) and transmit the vibration to the surface of the electric heating tube body (6) to accelerate the peeling of scale.

6. An electric heating tube with a self-cleaning structure according to claim 1, characterized in that, The electric heating tube body (6) includes an annular heating tube (8) and multiple electric heating tube bodies distributed equidistantly on the side of the annular heating tube (8). The electric heating tube bodies are connected to the annular heating tube (8). The other end of the annular heating tube (8) is fixedly connected to a control panel (3). The control panel (3) is embedded in the side of the water heater cylinder (1), and a sealing ring is provided at the connection between the two.

7. An electric heating tube with a self-cleaning structure according to claim 6, characterized in that, The control panel (3) is equipped with a control module, and the water heater cylinder (1) is equipped with a temperature sensor and a liquid level sensor. The temperature sensor and the liquid level sensor are electrically connected to the control module. The control module is electrically connected to the drive mechanism and is used to control the start, stop and extension stroke of the drive mechanism according to the usage time, the degree of scale accumulation or user instructions.

8. An electric heating tube with a self-cleaning structure according to claim 1, characterized in that, The lower side of the outer surface of the water heater cylinder (1) is connected and fixed with a hot water pipe interface (4) and a cold water pipe interface (5), and the inner wall of the water heater cylinder (1) is provided with an anti-corrosion inner liner.

9. An electric heating tube with a self-cleaning structure according to claim 1, characterized in that, The cleaning mechanism (9) is provided in three sets, each corresponding to one of the three electric heating tube bodies. The three sets of cleaning mechanisms (9) are linked to the output end of the drive mechanism through the same drive disk (7).

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