Electric heater of household appliance

Abstract

The electric heater comprises a shell, an electric heating module and a fluid system, the electric heating module is arranged in the shell and used for heating liquid, the fluid system is used for controlling fluid to enter and be discharged out of the electric heating module, the electric heating module comprises an electric heating body, a cavity is formed in the electric heating body, and an electric heating pipe is arranged on the electric heating body; an inlet mechanism and a discharge mechanism are arranged on the electric heating body, a blocking mechanism is arranged between the inlet mechanism and the discharge mechanism, the fluid system comprises a pump, an inlet pipe, a connecting pipe and a discharge pipe, one end of the connecting pipe is connected with an outlet of the pump, the other end of the connecting pipe is connected with the outer end of the inlet mechanism, and the inlet pipe is connected with an inlet of the pump. The discharge pipe is connected with the outer end of the discharge mechanism; and the outer ends of the inlet pipe and the discharge pipe extend out of the bottom of the shell. The bottom feeding and discharging design is adopted, so that the manufacturing difficulty is reduced, the production efficiency is improved, the production cost is further reduced, and meanwhile, the heating efficiency is improved and the energy consumption is reduced by additionally arranging a heat preservation structure.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and particularly to an electric heater for household appliances. Background Art

[0002] Electric heating steam products play a crucial role in household appliances such as steam ovens, steam - convection ovens, range hoods, etc. However, the electric heating steam products currently used in the market have the following problems during use: 1. Due to the relatively large overall volume of the electric heating steam products, their installation and use are easily restricted. In particular, the design of the inlet - outlet mechanism is unreasonable, resulting in many practical problems such as increased manufacturing difficulty and inconvenient installation and use; 2. The electric heating module is prone to generating dirt when heating liquids, causing problems such as dirt clogging the pipeline in the later stage. Therefore, it is very necessary to improve the existing electric heater to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide an electric heater for household appliances. The present invention adopts a bottom - inlet and bottom - outlet design, thereby reducing the manufacturing difficulty, increasing the production efficiency, and further reducing the production cost. At the same time, it can also significantly reduce the generation of dirt and avoid dirt clogging the pipeline in the later stage.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An electric heater for household appliances, comprising a housing, an electric heating module disposed in the housing for heating a liquid, and a fluid system for controlling the entry and exit of fluid into and out of the electric heating module. The electric heating module includes an electric heating main body, a chamber is provided in the electric heating main body, and an electric heating tube is provided on the electric heating main body; an inlet mechanism and an outlet mechanism communicating the inside and outside of the chamber of the electric heating main body are provided on the electric heating main body. The inner and outer ends of the inlet mechanism are respectively higher than the inner and outer surfaces of the bottom of the chamber of the electric heating main body, and the inner and outer ends of the outlet mechanism are also respectively higher than the inner and outer surfaces of the bottom of the chamber of the electric heating main body. A blocking mechanism is provided on the inner surface of the chamber of the electric heating main body corresponding to the position between the inlet mechanism and the outlet mechanism. The outer peripheral surface of the blocking mechanism is in an arc - surface structure. The fluid system is disposed at the bottom of the electric heating module. The fluid system includes a pump, an inlet pipe, a connecting pipe, and an outlet pipe. The pump is installed in the housing. One end of the connecting pipe is connected to the outlet of the pump, the other end of the connecting pipe is connected to the outer end of the inlet mechanism, the inlet pipe is connected to the inlet of the pump, the outlet pipe is connected to the outer end of the outlet mechanism, and the outer ends of the inlet pipe and the outlet pipe both extend out from the bottom of the housing.

[0005] By adopting the above technical solutions, an innovative structural design is carried out for the electric heating module. The bottom-in and bottom-out design is adopted, which reduces the manufacturing difficulty, increases the production efficiency, and further reduces the production cost. Moreover, it adopts an anti-scaling design. The outer peripheral surface of the barrier mechanism is designed as an arc surface structure, which reduces the internal cavity barrier sorting as a whole and eliminates the internal cavity dead corners, thus effectively reducing the generation of water scale.

[0006] The present invention is further configured such that the inlet mechanism and the outlet mechanism of the electric heating body are arranged at the bottom of the electric heating body, and the fluid system is arranged below the electric heating module.

[0007] By adopting the above technical solutions, a bottom-in and middle-position design is adopted. The inlet fluid rushes out under the action of pressure, hits the inner surface of the electric heating body and scatters around the inner cavity of the cavity to form water droplets, increasing the contact with the inner surface of the electric heating body, making it easier to be heated and quickly atomized to generate steam.

[0008] The present invention is further configured such that a protective filtering device is arranged at the position corresponding to the barrier mechanism and the outlet mechanism in the cavity of the electric heating body.

[0009] By adopting the above technical solutions, the protective filtering device is used to filter impurities in the steam, further reducing the risk of blockage of the discharge pipeline by dirt.

[0010] The present invention is further configured such that a protective layer is provided on the inner surface of the cavity of the electric heating body.

[0011] By adopting the above technical solutions, the protective layer can be a protective coating with functions such as anti-corrosion and anti-adhesion, such as Teflon, medical stone, nano-ceramic film, etc. Adding a protective layer on the inner wall of the cavity of the electric heating body can further reduce the generation of water scale and increase the service life of the electric heating element.

[0012] The present invention is further configured such that a pump fixing bracket is arranged inside the outer shell, and the pump is installed on the pump fixing bracket.

[0013] By adopting the above technical solutions, the fixed installation of the pump can be realized.

[0014] The present invention is further configured to further include a heat preservation device made of heat preservation material. The heat preservation device covers the electric heating body inside, and an assembly mechanism for fixing the heat preservation device is arranged on the outer wall of the electric heating body.

[0015] By adopting the above technical solutions, adding a heat preservation device can improve the heating efficiency and reduce the energy consumption.

[0016] The present invention is further configured such that the heat preservation device includes a heat preservation upper cover and a heat preservation lower cover that are both hollow and open at one end. The heat preservation upper cover and the heat preservation lower cover are cooperatively connected, and a heat preservation cavity is formed inside with a shape adapted to the outer shape of the electric heating main body. The electric heating main body is disposed in the heat preservation cavity.

[0017] By adopting the above technical solution, the heat preservation upper cover and the heat preservation lower cover are spliced and sleeved on the outer periphery of the electric heating main body, minimizing the openings of the heat preservation device and avoiding the diffusion of heat radiation.

[0018] The present invention is further configured such that an annular positioning protrusion is provided on the end surface of the heat preservation upper cover, and a positioning groove adapted to the positioning protrusion is provided on the end surface of the heat preservation lower cover.

[0019] By adopting the above technical solution, it is not only beneficial to the positioning and cooperative installation of the heat preservation upper cover and the heat preservation lower cover, but also can make the connection structure between the two more stable.

[0020] The present invention is further configured such that an electric heating main body fixing bracket is connected to the pump fixing bracket, and the electric heating main body is connected to the electric heating main body fixing bracket through fasteners, so that the electric heating main body is separated from the inner wall of the outer shell.

[0021] By adopting the above technical solution, while the electric heating main body fixing bracket is installed from the bottom, the pump fixing bracket is also used to separate the outer shell, further reducing the heat transfer by solids, effectively reducing the temperature transfer, and reducing the temperature rise of the outer shell.

[0022] The present invention is further configured such that the mechanism directly installed and fixed to the electric heating main body is disposed inside the outer shell.

[0023] By adopting the above technical solution, it is avoided that the temperature of the metal components in direct contact with the electric heating main body is exposed outside the outer shell, resulting in non-compliance with the temperature rise standard.

[0024] The present invention is further configured to further include a sealing device. The electric heating main body includes a bottom shell and a cover plate. The bottom shell and the cover plate are connected together through fasteners. The sealing device includes a closed-loop sealing member, and the sealing member is clamped between the bottom shell and the cover plate.

[0025] By adopting the above technical solution, the split design of the electric heating main body is not only beneficial to processing and assembly, but also ensures the sealing performance between the bottom shell and the cover plate through the sealing member after assembly, preventing liquid leakage and making the structure more reliable.

[0026] The present invention is further configured to further include a safety control device, which is detachably connected to the electric heating main body through a fastener. The number of the electric heating tubes is one or more. The safety control device includes a thermostat A and a thermostat B that are respectively electrically connected to the electric heating tubes for controlling the temperature of the corresponding electric heating tubes, a temperature control sensor for reading the temperature of the electric heating main body in real time, and a grounding mechanism for grounding.

[0027] By adopting the above technical solution, the safety control device can be used to protect the electric heating tubes from overheating and burning out. The detachable connection structure of the safety control device not only facilitates the pre-assembly production but also is conducive to the disassembly and replacement during later maintenance. The temperature parameters of thermostat A and thermostat B are different and are used to protect the electric heating tubes from overheating and burning out. The temperature control sensor is used to read the temperature of the electric heating main body in real time, which can be used for temperature acquisition and analysis, as well as for over-temperature alarm or stopping the operation of the electric heating tubes. In addition, the accidental leakage current is guided through the grounding mechanism 34 to prevent electric shock accidents.

[0028] The present invention is further configured to that the housing includes a shell, a bottom cover and a top cover. The shell is in a hollow shape with both ends open. The bottom cover and the top cover are respectively connected to both ends of the shell to cover the electric heating module and the fluid system inside. A downwardly protruding support convex part is further provided at the edge of the bottom cover.

[0029] By adopting the above technical solution, the detachable structure of the housing facilitates the pre-assembly production and the later maintenance operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic structural view of the whole of the present invention;

[0031] Figure 2 is a front view of the electric heating module of the present invention;

[0032] Figure 3 is a side view of the electric heating module of the present invention;

[0033] Figure 4 is a partial cross-sectional view of the electric heating module of the present invention.

[0034] In the figure:

[0035] 1. Housing; 11. Shell; 12. Bottom cover; 13. Support convex part; 14. Top cover;

[0036] 2. Electric heating module; 21. Electric heating main body; 22. Chamber; 23. Electric heating tube; 24. Inlet mechanism; 25. Outlet mechanism; 26. Electric heating main body fixing bracket; 27. Assembly mechanism; 28. Blocking mechanism; 29. Protective filtering device; 210. Protective layer; 211. Bottom shell; 212. Cover plate;

[0037] 3. Fluid system; 31. Pump; 32. Inlet pipe; 33. Connecting pipe; 34. Discharge pipe; 35. Pump fixing bracket;

[0038] 4. Thermal insulation device; 41. Upper thermal insulation cover; 42. Lower thermal insulation cover; 43. Thermal insulation cavity; 44. Positioning protrusion; 45. Positioning groove;

[0039] 5. Sealing device; 51. Sealing element;

[0040] 6. Safety control device; 61. Thermostat A; 62. Thermostat B; 63. Temperature control sensor; 64. Grounding mechanism. Detailed implementation mode

[0041] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment: As shown in the appendix Figures 1 to 4The electric heater of the household appliance shown (the rightward direction in the attached drawing is the bottom position of the actual product), including a housing 1, an electric heating module 2 disposed in the housing 1 for heating a liquid, and a fluid system 3 for controlling the entry and exit of fluid into and out of the electric heating module 2. The housing 1 can be designed as a split structure to facilitate the installation of internal devices. The electric heating module 2 includes an electric heating main body 21. A chamber 22 is provided in the electric heating main body 21. An electric heating tube 23 is provided on the electric heating main body 21. The electric heating tube 23 can be provided on the electric heating main body 21 by casting. An entry mechanism 24 and an exit mechanism 25 for communicating the inside and outside of the chamber 22 of the electric heating main body 21 are provided on the electric heating main body 21. The entry mechanism 24 is the water inlet pipe, and the exit mechanism 25 is the air outlet pipe. In this embodiment, the water inlet pipe and the air outlet pipe are integrally structured with the electric heating main body 21. The inner and outer ends of the entry mechanism 24 are respectively higher than the inner and outer surfaces of the bottom of the chamber 22 of the electric heating main body 21, and the inner and outer ends of the exit mechanism 25 are also respectively higher than the inner and outer surfaces of the bottom of the chamber 22 of the electric heating main body 21. A blocking mechanism 28 is provided on the inner surface of the chamber 22 of the electric heating main body 21 at a position corresponding to between the entry mechanism 24 and the exit mechanism 25. The blocking mechanism 28 can be integrally provided as a blocking convex structure in the electric heating main body 21. The outer peripheral surface of the blocking mechanism 28 is in an arc surface structure, and the overall cross-section can be circular or oblate, and the junction of the blocking mechanism 28 and the inner surface of the chamber 22 of the electric heating main body 21 is transitioned by a round chamfer. The electric heating tube 23 is provided at one end of the electric heating main body 21 away from the entry mechanism 24. The fluid system 3 includes a pump 31, an inlet pipe 32, a connecting pipe 33, and an outlet pipe 34. The pump 31 is installed in the housing 1. One end of the connecting pipe 33 is connected to the outlet of the pump 31, and the other end of the connecting pipe 33 is connected to the outer end of the entry mechanism 24. The inlet pipe 32 is connected to the inlet of the pump 31, and the outlet pipe 34 is connected to the outer end of the exit mechanism 25. And the outer ends of the inlet pipe 32 and the outlet pipe 34 both extend out from the bottom of the housing 1. This design innovatively structures the electric heating module 2, adopts a bottom entry and exit design, thereby reducing the manufacturing difficulty, increasing the production efficiency, and further reducing the production cost. And, it adopts an anti-scaling design. By providing the blocking mechanism 28 to prevent the liquid from directly entering the exit mechanism 25 for discharge, the outer peripheral surface of the blocking mechanism 28 is designed as an arc surface structure, which reduces the internal cavity blocking and sequencing as a whole, and more eliminates the internal cavity dead corners, thereby effectively reducing the generation of scale.

[0043] As shown in the attached Figure 1 drawing, the entry mechanism 24 and the exit mechanism 25 of the electric heating main body 21 are provided at the bottom of the electric heating main body 21, and the fluid system 3 is provided below the electric heating module 2. It adopts a bottom entry and middle placement design. The entering fluid rushes out under pressure, hits the inner surface of the electric heating main body 21 and scatters around the inner part of the cavity to form water droplets, increasing the contact with the inner surface of the electric heating main body 21, being more easily heated and quickly atomized to generate steam.

[0044] As shown in the attached Figure 1 and the attached Figure 4 As shown, a protective filtering device 29 is provided at a position in the chamber 22 of the electrothermal main body 21 corresponding to between the blocking mechanism 28 and the discharging mechanism 25. The protective filtering device 29 can adopt a filter screen or a filter element. The protective filtering device 29 is used to filter impurities in the steam, further reducing the risk of blockage of the discharge pipe 34 by dirt.

[0045] As shown in the attached Figure 4 As shown, a protective layer 210 is provided on the inner surface of the chamber 22 of the electrothermal main body 21. The protective layer 210 can be a protective coating with functions such as anti-corrosion and anti-adhesion, such as Teflon, meerschaum, or nano-ceramic film. Adding the protective layer 210 to the inner wall of the chamber 22 of the electrothermal main body 21 can further reduce the generation of scale and increase the service life of the electric heating element.

[0046] As shown in the attached Figure 1 As shown, a pump fixing bracket 26 is provided in the housing 1. The fixing bracket can be connected to the inner bottom of the housing 1 by screws or can be connected to the two by welding. The pump 31 can be installed on the pump fixing bracket 26 by means of bolt connection. This design enables the convenient installation of the pump 31.

[0047] As shown in the attached Figure 1 As shown, the electric heating steam product further includes a heat preservation device 4 made of heat preservation material. Among them, the heat preservation material can adopt materials with high temperature resistance and good heat preservation performance, such as stainless steel, rock wool, or polyurethane foam. The heat preservation device 4 covers the electrothermal main body 21 inside, and an assembly mechanism 27 for fixing the heat preservation device 4 is provided on the outer wall of the electrothermal main body 21. In this embodiment, the assembly mechanism 27 is a positioning post integrally provided on the outside of the electrothermal main body 21, and the positioning post 21 is connected to the heat preservation device 4 by screws or other fasteners. Adding the heat preservation device 4 can improve the heating efficiency and reduce energy consumption.

[0048] In addition, openings for the inlet mechanism 24 and the discharge mechanism 25 to pass through need to be opened on the heat preservation device 4.

[0049] As shown in the attached Figure 1 As shown, the heat preservation device 4 includes a heat preservation upper cover 41 and a heat preservation lower cover 42 that are both hollow and open at one end. The heat preservation upper cover 41 and the heat preservation lower cover 42 are cooperatively connected, and a heat preservation cavity 43 is formed inside. The electrothermal main body 21 is arranged in the heat preservation cavity 43. By using the method of splicing the heat preservation upper cover 41 and the heat preservation lower cover 42 to sleeved around the outer periphery of the electrothermal main body 21, the opening of the heat preservation device 4 is minimized to avoid the diffusion of heat radiation.

[0050] As shown in the attached Figure 1As shown, a ring-shaped positioning protrusion 44 is provided on the end face of the heat preservation upper cover 41, and a positioning groove 45 adapted to the positioning protrusion 44 is provided on the end face of the heat preservation lower cover 42. The connection between the heat preservation upper cover 41 and the heat preservation lower cover 42 can be realized by the interference fit between the positioning protrusion 44 and the positioning groove 45. This design not only facilitates the positioning and fitting installation of the heat preservation upper cover 41 and the heat preservation lower cover 42, but also makes the connection structure between the two more stable.

[0051] As shown in the Figure 1 attachment, a heating element fixing bracket 26 is connected to the pump fixing bracket 26, and the two can be connected by bolts. The heating element 21 is connected to the heating element fixing bracket 26 through fasteners. The fasteners can be screws or bolts, so that the heating element 21 is separated from the inner wall of the housing 1. The mechanism directly installed and fixed to the heating element 21 is disposed inside the housing 1. When the heating element fixing bracket 26 is installed from the bottom, the pump fixing bracket 26 is also used to separate the housing 1, further reducing the heat transfer through solids, thereby effectively reducing the temperature transfer and the temperature rise of the housing 1. And the mechanism directly installed and fixed to the heating element 21 is disposed inside the housing 1, avoiding the temperature of the metal components in direct contact with the heating element 21 being exposed outside the housing 1, resulting in non-compliance of the temperature rise.

[0052] As shown in the Figure 1 and Figure 4 attachment, the electric heater further includes a sealing device 5. The heating element 21 includes a bottom case 211 and a cover plate 212. The bottom case 211 and the cover plate 212 are connected together through fasteners. The sealing device 5 includes a closed-loop sealing member 51. The sealing member 51 is clamped between the bottom case 211 and the cover plate 212. An annular sealing groove can be provided on the end face of the bottom case 211, and the sealing member 51 is embedded in the sealing groove. The sealing member 51 can be a sealing ring made of silicone or rubber. The split design of the heating element 21 not only facilitates processing and assembly, but also ensures the sealing between the bottom case 211 and the cover plate 212 through the sealing member 51 after assembly, preventing liquid leakage and making the structure more reliable.

[0053] As shown in the Figures 1 to 4As shown, the electric heater further includes a safety control device 6. The safety control device 6 is connected to the electric heating tube 23 through a wire. The safety control device 6 is detachably connected to the electric heating main body 21 through a fastener (such as a screw). The number of the electric heating tubes 23 is one or more. The safety control device 6 includes a thermostat A61 and a thermostat B62 that are respectively electrically connected to the electric heating tube 23 to control the temperature of the corresponding electric heating tube 23, a temperature control sensor 63 for reading the temperature of the electric heating main body 21 in real time, and a grounding mechanism 64 for grounding. The safety control device 6 is provided to protect the electric heating tube 23 from overheating and burning out. The detachable connection structure of the safety control device 6 not only facilitates the pre-assembly production but also is conducive to the disassembly and replacement during later maintenance. The temperature parameters of the thermostat A61 and the thermostat B62 are different, which are used to protect the electric heating tube 23 from overheating and burning out. The temperature control sensor 63 is used to read the temperature of the electric heating main body 21 in real time, which can be used for temperature acquisition and analysis, or for over-temperature alarm or stopping the operation of the electric heating tube 23. In addition, the accidental leakage current is guided through the grounding mechanism 64 to prevent electric shock accidents.

[0054] As shown in the attached Figure 1 figure, the housing 1 includes a housing body 11, a bottom cover 12 and a top cover 14. The housing body 11 is hollow and open at both ends. The bottom cover 12 and the top cover 14 are respectively connected to both ends of the housing body 11 to cover the electric heating module 2 and the fluid system 3 inside. A supporting convex portion 13 protruding downward is further provided at the edge of the bottom cover 12. The detachable structure of the housing 1 facilitates the pre-assembly production and the later maintenance operation. Among them, the supporting convex portion 13 can be an L-shaped bending structure, which plays a role in moisture-proofing, and at the same time leaves some space between the bottom cover 12 and the installation surface to facilitate the passage of pipelines or wires.

Claims

1. Electric heater for household appliances, comprising a housing (1), an electric heating module (2) disposed within the housing (1) for heating a liquid, and a fluid system (3) for controlling the entry and exit of fluid to and from the electric heating module (2), wherein the electric heating module (2) comprises an electric heating body (21), a chamber (22) is provided within the electric heating body (21), and an electric heating tube (23) is provided on the electric heating body (21); characterized in that: An inlet mechanism (24) and an outlet mechanism (25) communicating the inside and outside of the chamber (22) of the electrothermal main body (21) are provided on the electrothermal main body (21). The inner and outer ends of the inlet mechanism (24) are respectively higher than the inner and outer surfaces of the bottom of the chamber (22) of the electrothermal main body (21), and the inner and outer ends of the outlet mechanism (25) are also respectively higher than the inner and outer surfaces of the bottom of the chamber (22) of the electrothermal main body (21). A blocking mechanism (28) is arranged on the inner surface of the chamber (22) of the electrothermal main body (21) at a position corresponding to the position between the inlet mechanism (24) and the outlet mechanism (25). The outer peripheral surface of the blocking mechanism (28) is of an arc surface structure. The fluid system (3) includes a pump (31), an inlet pipe (32), a connecting pipe (33), and an outlet pipe (34). The pump (31) is installed in the housing (1). One end of the connecting pipe (33) is connected to the outlet of the pump (31), and the other end of the connecting pipe (33) is connected to the outer end of the inlet mechanism (24). The inlet pipe (32) is connected to the inlet of the pump (31), and the outlet pipe (34) is connected to the outer end of the outlet mechanism (25). And the outer ends of the inlet pipe (32) and the outlet pipe (34) both extend out from the bottom of the housing (1).

2. The electric heater of the household appliance according to claim 1, characterized in that: The inlet mechanism (24) and the outlet mechanism (25) of the electrothermal main body (21) are arranged at the bottom of the electrothermal main body (21), and the fluid system (3) is arranged below the electric heating module (2).

3. The electric heater of the household appliance according to claim 1, wherein: A protective filtering device (29) is arranged in the chamber (22) of the electrothermal main body (21) at a position corresponding to the position between the blocking mechanism (28) and the outlet mechanism (25).

4. The electric heater of the household appliance according to claim 1, characterized in that: A protective layer (210) is provided on the inner surface of the chamber (22) of the electrothermal main body (21).

5. The electric heater of the household appliance according to claim 1, characterized in that: There is also a heat preservation device (4) made of heat preservation material. The heat preservation device (4) covers the electrothermal main body (21) inside, and an assembly mechanism (27) for fixing the heat preservation device (4) is provided on the outer wall of the electrothermal main body (21). The heat preservation device (4) includes a heat preservation upper cover (41) and a heat preservation lower cover (42) which are both hollow and open at one end. The heat preservation upper cover (41) and the heat preservation lower cover (42) are connected in a matching manner and form a heat preservation cavity (43) inside. The electrothermal main body (21) is arranged in the heat preservation cavity (43). A ring-shaped positioning protrusion (44) is provided on the end surface of the heat preservation upper cover (41), and a positioning groove (45) adapted to the positioning protrusion (44) is provided on the end surface of the heat preservation lower cover (42).

6. The electric heater of the household appliance according to claim 5, characterized in that: A pump fixing bracket (35) is arranged in the housing (1), and the pump (31) is installed on the pump fixing bracket (35). An electrothermal main body fixing bracket (26) is connected to the pump fixing bracket (35), and the electrothermal main body (21) is connected to the electrothermal main body fixing bracket (26) through fasteners, so that the electrothermal main body (21) is separated from the inner wall of the housing (1).

7. The electric heater of the household appliance according to claim 6, characterized in that: The mechanism directly installed and fixed to the electrothermal main body (21) is arranged inside the housing (1).

8. The electric heater of the household appliance according to claim 1, wherein: It further includes a sealing device (5). The electric heating main body (21) includes a bottom shell (211) and a cover plate (212). The bottom shell (211) and the cover plate (212) are connected together by fasteners. The sealing device (5) includes a sealing member (51) in a closed loop, and the sealing member (51) is clamped between the bottom shell (211) and the cover plate (212).

9. The electric heater of the household appliance according to claim 1, characterized in that: It further includes a safety control device (6). The safety control device (6) is detachably connected to the electric heating main body (21) by fasteners. The number of the electric heating tubes (23) is one or more. The safety control device (6) includes a thermostat A (61), a thermostat B (62) respectively electrically connected to the electric heating tubes (23) for controlling the temperature of the corresponding electric heating tubes (23), a temperature control sensor (63) for reading the temperature of the electric heating main body (21) in real time, and a grounding mechanism (64) for grounding.

10. The electric heater of the household appliance according to claim 1, characterized in that: The outer shell (1) includes a housing (11), a bottom cover (12) and a top cover (14). The housing (11) is in a hollow shape with openings at both ends. The bottom cover (12) and the top cover (14) are respectively connected to both ends of the housing (11) to cover the electric heating module (2) and the fluid system (3) inside. A supporting convex portion (13) protruding downward is further provided at the edge of the bottom cover (12).

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