Electric heater

Abstract

The present invention relates to an electric heater, comprising a shell, an electric heating film and an exhaust assembly, wherein the shell is provided with an air inlet and an air outlet, the electric heating film is arranged in the shell, an air inlet channel is formed on the front side of the electric heating film, and an air outlet channel is formed on the back side of the electric heating film, the air inlet is communicated with the inlet end of the air inlet channel, the air outlet is communicated with the outlet end of the air outlet channel, the outlet end of the air inlet channel is communicated with the inlet end of the air outlet channel, and the exhaust assembly is arranged in the shell, and is used to provide power for the gas in the shell to flow from the air inlet to the air outlet. The air entering the electric heater undergoes heat exchange in both the air inlet channel and the air outlet channel, thereby prolonging the time for the air to undergo heat exchange in the electric heater, thereby fully transferring the heat generated by the electric heating film to the air, and improving the heating efficiency.

Description

Technical Field

[0001] The invention relates to the field of heating equipment, in particular to an electric heater. Background Art

[0002] In order to improve the environment and reduce pollution, the use of electricity for heating has become popular. Electric heaters use electricity as energy, converting electrical energy into thermal energy to provide heat for the human body. Generally speaking, the indoor space required for electric heaters is larger than the heating capacity of electric heaters. And because hot air floats directly during natural convection, electric heaters are prone to the problem of "hot head and cold feet". As resource conservation is gradually valued, how to improve the heating efficiency of electric heaters is particularly important. Summary of the invention

[0003] Based on this, it is necessary to provide an electric heater to improve its heating efficiency.

[0004] An electric heater comprises a shell, an electric heating film and an exhaust assembly, wherein the shell is provided with an air inlet hole and an air outlet hole, the electric heating film is arranged in the shell, an air inlet channel is formed on the front side of the electric heating film, and an air outlet channel is formed on the back side of the electric heating film, the air inlet hole is connected with the inlet end of the air inlet channel, the air outlet hole is connected with the outlet end of the air outlet channel, the outlet end of the air inlet channel is connected with the inlet end of the air outlet channel, and the exhaust assembly is arranged in the shell to provide power for the gas in the shell to flow from the air inlet hole to the air outlet hole.

[0005] The above scheme provides an electric heater. When in use, the heat generated by the electric heating film can be radiated out through the air inlet hole, directly acting on the human body or human clothing, thereby improving the heating comfort. Under the action of the exhaust assembly, the outside air can enter the air inlet channel through the air inlet hole, and perform heat exchange with the electric heating film in the air inlet channel. Then, the air that has undergone heat exchange in the air inlet channel enters the air outlet channel again, and can still perform heat exchange with the electric heating film in the air outlet channel. Finally, the hot air flows out from the air outlet hole, thereby extending the time for the air to exchange heat in the electric heater, thereby fully transferring the heat generated by the electric heating film to the air, thereby improving the heating efficiency. Moreover, the process of extending the time for the air to exchange heat in the electric heater is achieved by making full use of the air inlet channel on the front side and the air outlet channel on the back side of the electric heating film. Therefore, while improving the heating efficiency, it will not have a significant impact on the size of the electric heater.

[0006] In one of the embodiments, the air inlet hole is located above the air outlet hole, the electric heating film is arranged in the shell along the longitudinal direction, and the air inlet channel and the air outlet channel are both distributed along the longitudinal direction.

[0007] In one of the embodiments, the electric heating film forms a cylindrical structure, the electric heating film is spaced apart from the shell to form the air inlet channel, the space surrounded by the electric heating film is the air outlet channel, and the lower end of the electric heating film is spaced apart from the bottom wall of the shell so that the outlet end of the air outlet channel can be connected to the air outlet hole.

[0008] In one of the embodiments, the shell cover is arranged outside the electric heating film, the air inlet hole and the air outlet hole are both arranged on the side wall of the shell, and the air inlet hole and the air outlet hole are both multiple, and the multiple air inlet holes are distributed at intervals in the circumferential direction of the shell, and the multiple air outlet holes are distributed at intervals in the circumferential direction of the shell.

[0009] In one of the embodiments, the end of the electric heating film close to the air outlet is the bottom end, and a guide tube is provided at the bottom end of the electric heating film. The upper end of the guide tube is connected to the bottom end of the electric heating film, and the lower end of the guide tube is connected to the side wall of the shell. The guide tube gradually extends outward from the upper end to the lower end to form a trumpet-shaped structure, and the position on the shell where the guide tube is connected is located above the air outlet.

[0010] In one embodiment, the end of the electric heating film close to the air outlet is the bottom end, and the bottom end of the electric heating film is provided with an annular guide plate, the inner circle of the guide plate is connected to the bottom end of the electric heating film, and the outer circle of the guide plate is connected to the side wall of the shell, and the position on the shell where the guide plate is connected is located above the air outlet.

[0011] In one embodiment, the electric heating film is a cylindrical tube or a prismatic tube.

[0012] In one of the embodiments, a flow channel partition is further provided in the electric heating film. The flow channel partition is arranged along the axial direction of the electric heating film. The flow channel partition is spaced apart from the electric heating film, and the spacing space between the flow channel partition and the electric heating film forms the air outlet channel.

[0013] In one of the embodiments, the flow channel partition is coaxially arranged with the electric heating film, and the bottom end of the flow channel partition is connected to the bottom wall of the shell.

[0014] In one of the embodiments, the flow channel partition is a cylindrical structure inserted in the electric heating film, or the flow channel partition is a guide block inserted in the electric heating film.

[0015] In one embodiment, the exhaust component is arranged at the top of the electrothermal film, and the air outlet direction of the exhaust component is toward the air outlet channel surrounded by the electrothermal film.

[0016] In one of the embodiments, an auxiliary mounting plate is provided at the top of the electrothermal film, the auxiliary mounting plate closes the top opening of the electrothermal film, a mounting hole is provided on the auxiliary mounting plate, and the exhaust assembly is arranged at the mounting hole.

[0017] In one embodiment, the air exhaust component is a turbo fan or an axial flow fan.

[0018] In one embodiment, the electric heating film is a plate-like structure, the air inlet is located on the side wall of the shell opposite to the front side of the electric heating film, and the air outlet is located on the side wall of the shell opposite to the back side of the electric heating film. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the electric heater described in this embodiment;

[0020] Figure 2 for Figure 1 A cross-sectional view of the electric heater shown in;

[0021] Figure 3 is a schematic structural diagram of an electric heater in another embodiment;

[0022] Figure 4 for Figure 3 A cross-sectional view of the electric heater shown.

[0023] Description of reference numerals:

[0024] 10. Electric heater; 11. Shell; 111. Air inlet; 112. Air outlet; 12. Electric heating film; 13. Exhaust assembly; 14. Air inlet channel; 15. Air outlet channel; 16. Guide tube; 17. Guide plate; 18. Flow channel partition; 19. Auxiliary mounting plate. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The various technical features of the above-described embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-described embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0028] like Figures 1 to 4 As shown, in one embodiment, an electric heater 10 is provided, including a shell 11, an electric heating film 12 and an exhaust assembly 13. The shell 11 is provided with an air inlet hole 111 and an air outlet hole 112, the electric heating film 12 is arranged in the shell 11, an air inlet channel 14 is formed on the front side of the electric heating film 12, and an air outlet channel 15 is formed on the back side of the electric heating film 12. The air inlet hole 111 is connected to the inlet end of the air inlet channel 14, the air outlet hole 112 is connected to the outlet end of the air outlet channel 15, and the outlet end of the air inlet channel 14 is connected to the inlet end of the air outlet channel 15. The exhaust assembly 13 is arranged in the shell 11, and is used to provide power for the gas in the shell 11 to flow from the air inlet hole 111 to the air outlet hole 112.

[0029] When in use, the heat generated by the electrothermal film 12 can be radiated through the air inlet hole 111, directly acting on the human body or human clothing, thereby improving heating comfort. Under the action of the exhaust component 13, the outside air can enter the air inlet channel 14 through the air inlet hole 111, and perform heat exchange with the electrothermal film 12 in the air inlet channel 14. Then, the air that has undergone heat exchange in the air inlet channel 14 enters the air outlet channel 15 again, and can still perform heat exchange with the electrothermal film 12 in the air outlet channel 15. Finally, the hot air flows out from the air outlet hole 112, thereby extending the time for the air to undergo heat exchange in the electric heater 10, and increasing the heat exchange area for the air to undergo heat exchange in the electric heater 10, thereby fully transferring the heat generated by the electrothermal film 12 to the air, thereby improving the heating efficiency. Moreover, the process of extending the heat exchange time of the air in the electric heater 10 is achieved by making full use of the air inlet channel 14 on the front side and the air outlet channel 15 on the back side of the electric heating film 12. Therefore, while improving the heating efficiency, it will not have a significant impact on the size of the electric heater 10.

[0030] Specifically, the air inlet 111 and the air outlet 112 may be arranged in various positions, and no specific limitation is imposed here. As long as the air entering from the air inlet 111 can pass through the air inlet channel 14 on the front side and the air outlet channel 15 on the back side of the electric heating film 12 in the electric heater 10 in sequence, heat exchange can be performed in both the air inlet channel 14 and the air outlet channel 15.

[0031] More specifically, if Figures 1 to 4 As shown, in one embodiment, the air inlet hole 111 is located above the air outlet hole 112, the electric heating film 12 is arranged in the shell 11 along the longitudinal direction, and the air inlet channel 14 and the air outlet channel 15 are both distributed along the longitudinal direction.

[0032] The heat generated by the electric heating film 12 is radiated out through the upper air inlet 111, and acts on the height area where the human body is located quickly, thereby improving the heating comfort. Under the action of the exhaust assembly 13, the hot air after heat exchange in the air inlet channel 14 and the air outlet channel 15 is blown out from the lower air outlet 112, quickly increasing the air temperature in the lower area, thereby effectively solving the problem of "hot head and cold feet".

[0033] Specifically, the electric heating film 12 can be a plate-like structure or a cylindrical structure. When the electric heating film 12 is a plate-like structure, the front side of the electric heating film 12 is the side opposite to the wall on which the air inlet 111 is provided on the shell 11, and the back side of the electric heating film 12 is the side opposite to the front side. When the electric heating film 12 is a cylindrical structure, the front side of the electric heating film 12 can be the outer side of the cylindrical structure, and the back side of the electric heating film 12 is the inner side of the cylindrical structure. Of course, the outer side of the electric heating film 12 can also be used as the back side, and the inner side of the electric heating film 12 can be used as the front side.

[0034] However, when the air inlet 111 is located above the air outlet 112 , the front side of the cylindrical electric heating film 12 is the outer side, and the back side is the inner side.

[0035] For example, in one embodiment, Figure 2 and Figure 4 As shown, the electric heating film 12 forms a cylindrical structure, and the electric heating film 12 is spaced apart from the shell 11 to form the air inlet channel 14. The space surrounded by the electric heating film 12 is the air outlet channel 15. The lower end of the electric heating film 12 is spaced apart from the bottom wall of the shell 11, so that the outlet end of the air outlet channel 15 can be connected to the air outlet hole 112.

[0036] The air entering from the air inlet hole 111 on the shell 11 first reaches the air inlet channel 14 formed between the electrothermal film 12 and the shell 11, and then flows from the outlet end of the air inlet channel 14 into the inlet end of the air outlet channel 15. The hot air flows from the lower end of the electrothermal film 12 to the air outlet hole 112 and is discharged into the room. It should be noted here that the outlet end of the air inlet channel 14 and the inlet end of the air outlet channel 15 are connected at the top of the electrothermal film 12. The air outlet channel 15 is a hollow space surrounded by the electrothermal film 12.

[0037] The design of the cylindrical structure can maximize the area of ​​the electric heating film 12 in the limited space of the shell 11, thereby increasing the heat exchange area.

[0038] Moreover, further, if Figures 1 to 4 As shown, a plurality of air inlet holes 111 may be provided on the housing 11 at a position opposite to the front of the electric heating film 12. For example, an array of air inlet holes 111 may be evenly distributed at a position on the housing 11 opposite to the electric heating film 12. On the one hand, the radiation efficiency of the heat of the electric heating film 12 is improved; on the other hand, the air intake efficiency of the air entering the air inlet channel 14 from the air inlet holes 111 is improved, that is, the air circulation of the electric heater 10 is improved.

[0039] Further, in one embodiment, if Figures 1 to 4As shown, the shell 11 is covered outside the electric heating film 12, and the air inlet 111 and the air outlet 112 are both arranged on the side wall of the shell 11. There are multiple air inlet 111 and multiple air outlet 112, and the multiple air inlet 111 is distributed at intervals in the circumferential direction of the shell 11, and the multiple air outlet 112 is distributed at intervals in the circumferential direction of the shell 11.

[0040] That is, the electric heating film 12 can radiate heat to the surroundings through the circumferentially distributed air inlet holes 111, and the hot air after heat exchange can also diffuse to the surroundings through the circumferentially distributed air outlet holes 112, and diffuse to the surrounding lower areas, thereby meeting the heating needs of people in different positions and improving the comfort of using the electric heater 10.

[0041] Furthermore, if Figure 2 As shown, in one embodiment, the end of the electric heating film 12 close to the air outlet 112 is the bottom end, and the bottom end of the electric heating film 12 is provided with a guide tube 16. The upper end of the guide tube 16 is butted with the bottom end of the electric heating film 12, and the lower end of the guide tube 16 is connected to the side wall of the shell 11. The guide tube 16 gradually turns outward and extends in the direction from the upper end to the lower end to form a trumpet-shaped structure, and the position on the shell 11 connected to the guide tube 16 is located above the air outlet 112.

[0042] The air heated in the air outlet channel 15 eventually flows out from the air outlet hole 112 under the guidance of the guide tube 16, reducing the exhaust resistance of the air exhaust component 13. Moreover, since the exhaust direction in the air outlet channel 15 is downward as a whole, turbulence is likely to occur near the bottom wall of the air outlet channel 15 without the guidance of the guide tube 16. At the same time, the guide tube 16 also better isolates the outlet end of the air outlet channel 15 from the air inlet channel 14, ensuring that the heated air can be discharged into the room from the air outlet hole 112 below.

[0043] It should be noted that the cross section of the trumpet-shaped structure of the guide tube 16 is not necessarily circular, but may also be square, and its specific shape depends on the cross-sectional shape of the electric heating film 12. For example, when the electric heating film 12 is a prismatic tube, the cross section of the guide tube 16 is polygonal. When the electric heating film 12 is a cylindrical tube, the cross section of the guide tube 16 is circular.

[0044] Or, further, in one embodiment, Figure 4As shown, the end of the electric heating film 12 close to the air outlet 112 is the bottom end, and the bottom end of the electric heating film 12 is provided with an annular guide plate 17, the inner circle of the guide plate 17 is connected to the bottom end of the electric heating film 12, and the outer circle of the guide plate 17 is connected to the side wall of the shell 11, and the position on the shell 11 connected to the guide plate 17 is located above the air outlet 112.

[0045] The guide plate 17 not only plays a guiding role, but also plays a role in isolating the outlet end of the air outlet channel 15 from the air inlet channel 14 .

[0046] Further, in one embodiment, if Figure 2 and Figure 4 As shown, when the electric heating film 12 is the cylindrical structure, a flow channel partition 18 is also provided in the electric heating film 12. The flow channel partition 18 is arranged along the axial direction of the electric heating film 12. The flow channel partition 18 is spaced apart from the electric heating film 12. The space between the flow channel partition 18 and the electric heating film 12 forms the air outlet channel 15.

[0047] The arrangement of the flow channel partition 18 cooperates with the electric heating film 12 to reduce the cross-sectional area of ​​the air outlet channel 15, thereby increasing the circulation speed of the air in the air outlet channel 15. Moreover, the arrangement of the flow channel partition 18 enables the hot air entering the hollow space of the electric heating film 12 to be expelled and distributed to the air outlet channel 15 close to the electric heating film 12, thereby expanding the heat exchange area, allowing the air to fully contact the electric heating film 12 for heat exchange, and improving the heat exchange efficiency.

[0048] In order to prevent the flow channel partition 18 from occupying too much of the hollow space of the electric heating film 12 and affecting the air circulation, the distance between the flow channel partition 18 and the electric heating film 12 can be set to 10mm~80mm, thereby ensuring that the air and the electric heating film 12 can be fully in contact and improving the heat exchange efficiency in the air outlet channel 15, while also preventing the flow channel partition 18 from having too much impact on the air circulation in the air outlet channel 15.

[0049] Furthermore, in one embodiment, the flow channel partition 18 is coaxially arranged with the electric heating film 12 , and the bottom end of the flow channel partition 18 is connected to the bottom wall of the shell 11 .

[0050] Thus, the hot air reaching the bottom end in the air outlet channel 15 flows out from the air outlet hole 112 under the guidance of the flow channel partition 18 and the bottom wall of the shell 11. When the guide tube 16 or the guide plate 17 is provided in the electric heater 10, the guide tube 16 or the guide plate 17 guides the hot air together with the flow channel partition 18 and the bottom wall of the shell 11.

[0051] Specifically, in one embodiment, the flow channel partition 18 may be a cylindrical structure inserted in the electric heating film 12 , or the flow channel partition 18 may be a guide block inserted in the electric heating film 12 .

[0052] More specifically, the exhaust component 13 can be arranged in the air inlet channel 14 or in the air outlet channel 15, as long as the wind direction it provides can enable the gas entering the electric heater 10 to move along the path of the aforementioned air inlet hole 111, air inlet channel 14, air outlet channel 15 and air outlet hole 112.

[0053] For example, in one embodiment, Figure 2 and Figure 4 As shown, when the electrothermal film 12 is a cylindrical structure, the exhaust assembly 13 is arranged at the top of the electrothermal film 12 , and the air outlet direction of the exhaust assembly 13 is toward the air outlet channel 15 surrounded by the electrothermal film 12 .

[0054] When the electrothermal film 12 is a cylindrical structure, the air inlet channel 14 is equivalent to being sleeved outside the air outlet channel 15, and the air flow direction in the air inlet channel 14 is just opposite to that in the air outlet channel 15. For this reason, the air exhaust component 13 is arranged at the top of the electrothermal film 12, thereby effectively changing the air flow direction, so that the air at the outlet end of the air inlet channel 14 can be reversed and flow downward into the inlet end of the air outlet channel 15. Ensure that the air can move forward along the above path.

[0055] After adopting a cylindrical structure to increase the heat exchange area, the change of the air flow direction in the air inlet channel 14 and the air outlet channel 15 is solved by the exhaust assembly 13, thereby improving the heat exchange efficiency of the electric heater 10 as a whole.

[0056] Furthermore, if Figure 2 and Figure 4 As shown, in one embodiment, an auxiliary mounting plate 19 is provided at the top of the electrothermal film 12, and the auxiliary mounting plate 19 closes the top opening of the electrothermal film 12. A mounting hole is provided on the auxiliary mounting plate 19, and the exhaust assembly 13 is arranged at the mounting hole.

[0057] The auxiliary mounting plate 19 is provided so that the outlet end of the air inlet channel 14 and the inlet end of the air outlet channel 15 are connected only through the mounting hole, and the exhaust assembly 13 is provided in the mounting hole, thereby ensuring that the air in the electric heater 10 can only move along the aforementioned path.

[0058] Moreover, when the bottom end of the electrothermal film 12 is further provided with the guide tube 16 or the guide plate 17, the air inlet channel 14 and the air outlet channel 15 can be connected only at the position of the mounting hole, further ensuring that the air can move along the aforementioned path and ensuring that the purpose of increasing the heat exchange area can be achieved.

[0059] Specifically, in one embodiment, the air exhaust component 13 is a turbo fan or an axial flow fan.

[0060] Optionally, the exhaust assembly 13 may also be other components that can provide forward motive force for the air, which is not specifically limited here.

[0061] However, no matter what the specific structure of the exhaust assembly 13 is, its arrangement position and exhaust direction must be able to meet the aforementioned path requirements.

[0062] Furthermore, in one embodiment, when the electric heating film 12 is a plate-like structure, the air inlet 111 is located on the side wall of the shell 11 opposite to the front side of the electric heating film 12, and the air outlet 112 is located on the side wall of the shell 11 opposite to the back side of the electric heating film 12.

[0063] That is, the air entering from the air inlet 111 first exchanges heat with the front side of the electric heating film 12 in the air inlet channel 14, and then exchanges heat with the back side of the electric heating film 12 when entering the air outlet channel 15. The air inlet 111 and the air outlet 112 are located at opposite sides of the electric heating film 12, thereby improving the smoothness of air circulation in the electric heater 10 when the electric heating film 12 is a plate-like structure.

[0064] Of course, when the electrothermal film 12 is a plate-like structure, the air inlet 111 and the air outlet 112 may also be as follows: Figures 1 to 4 It is arranged on the side wall of the shell in the same direction, but at this time, a gap needs to be reserved between the bottom end of the electric heating film 12 and the bottom wall of the shell 11, so that the air in the air outlet channel 15 on the back side of the electric heating film 12 can flow into the air outlet hole 112 from the reserved gap. Moreover, a guide member can be further provided between the electric heating film 12 and the shell 11, and the guide member is located between the air inlet hole 111 and the air outlet hole 112 in the longitudinal direction. This further ensures that the air entering the electric heater 10 moves along the aforementioned path.

[0065] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An electric heater (10), characterized in that: The invention comprises a shell (11), an electric heating film (12) and an exhaust assembly (13); the shell (11) is provided with an air inlet hole (111) and an air outlet hole (112); the electric heating film (12) is arranged in the shell (11); an air inlet channel (14) is formed on the front side of the electric heating film (12); and an air outlet channel (15) is formed on the back side of the electric heating film (12); the air inlet hole (111) is connected to the inlet end of the air inlet channel (14); the air outlet hole (112) is connected to the outlet end of the air outlet channel (15); the outlet end of the air inlet channel (14) is connected to the inlet end of the air outlet channel (15); the exhaust assembly (13) is arranged in the shell (11) and is used to provide power for the gas in the shell (11) to flow from the air inlet hole (111) to the air outlet hole (112); The electric heating film (12) is surrounded by a cylindrical structure, and a flow channel partition (18) is also provided in the electric heating film (12). The flow channel partition (18) is arranged along the axial direction of the electric heating film (12), and the flow channel partition (18) and the electric heating film (12) are spaced apart, and the space between the flow channel partition (18) and the electric heating film (12) forms the air channel (15).

2. The electric heater (10) according to claim 1, characterized in that: The air inlet hole (111) is located above the air outlet hole (112), the electric heating film (12) is arranged in the shell (11) along the longitudinal direction, and the air inlet channel (14) and the air outlet channel (15) are both distributed along the longitudinal direction.

3. The electric heater (10) according to claim 2, characterized in that: The electric heating film (12) is spaced apart from the shell (11) to form the air inlet channel (14); the space enclosed by the electric heating film (12) is the air outlet channel (15); the lower end of the electric heating film (12) is spaced apart from the bottom wall of the shell (11) so that the outlet end of the air outlet channel (15) can be connected to the air outlet hole (112).

4. The electric heater (10) according to claim 3, characterized in that: The shell (11) is arranged outside the electric heating film (12); the air inlet hole (111) and the air outlet hole (112) are both arranged on the side wall of the shell (11); the air inlet hole (111) and the air outlet hole (112) are both multiple; the multiple air inlet holes (111) are distributed at intervals in the circumferential direction of the shell (11); and the multiple air outlet holes (112) are distributed at intervals in the circumferential direction of the shell (11).

5. The electric heater (10) according to claim 4, characterized in that: The end of the electric heating film (12) close to the air outlet (112) is the bottom end, and a guide tube (16) is provided at the bottom end of the electric heating film (12). The upper end of the guide tube (16) is connected to the bottom end of the electric heating film (12), and the lower end of the guide tube (16) is connected to the side wall of the shell (11). The guide tube (16) gradually extends outward from the upper end to the lower end to form a trumpet-shaped structure, and the position on the shell (11) connected to the guide tube (16) is located above the air outlet (112).

6. The electric heater (10) according to claim 4, characterized in that: The end of the electric heating film (12) close to the air outlet (112) is the bottom end, and the bottom end of the electric heating film (12) is provided with an annular guide plate (17), the inner circle of the guide plate (17) is connected to the bottom end of the electric heating film (12), the outer circle of the guide plate (17) is connected to the side wall of the shell (11), and the position on the shell (11) connected to the guide plate (17) is located above the air outlet (112).

7. The electric heater (10) according to claim 3, characterized in that: The electric heating film (12) is a cylindrical tube or a prismatic tube.

8. The electric heater (10) according to claim 1, characterized in that: The flow channel partition (18) is coaxially arranged with the electric heating film (12), and the bottom end of the flow channel partition (18) is connected to the bottom wall of the shell (11).

9. The electric heater (10) according to claim 1, characterized in that: The flow channel partition (18) is a cylindrical structure inserted in the electric heating film (12), or the flow channel partition (18) is a guide block inserted in the electric heating film (12).

10. The electric heater (10) according to any one of claims 3 to 7, characterized in that: The exhaust component (13) is arranged at the top end of the electrothermal film (12), and the air outlet direction of the exhaust component (13) is toward the air outlet channel (15) surrounded by the electrothermal film (12).

11. The electric heater (10) according to claim 10, characterized in that: An auxiliary mounting plate (19) is provided at the top of the electric heating film (12), and the auxiliary mounting plate (19) closes the top opening of the electric heating film (12). A mounting hole is provided on the auxiliary mounting plate (19), and the exhaust assembly (13) is arranged at the mounting hole.

12. The electric heater (10) according to any one of claims 1 to 7, characterized in that: The air extraction component (13) is a turbo fan or an axial flow fan.

13. The electric heater (10) according to claim 2, characterized in that: The electric heating film (12) is a plate-shaped structure, the air inlet (111) is located on a side wall of the shell (11) opposite to the front side of the electric heating film (12), and the air outlet (112) is located on a side wall of the shell (11) opposite to the back side of the electric heating film (12).

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