Electric heater

Abstract

The present application relates to a kind of electric heater, electric heater includes: heating body, heating body is equipped with heat dissipation port, heat dissipation port is used to discharge hot air;Detection piece, the shape of detection piece is annular structure, detection piece is located on heating body, heat dissipation port is located in the inner ring space of detection piece, detection piece is electrically connected with heating body, detection piece is used to detect the foreign matter in the preset distance relative to heat dissipation port.The above-mentioned electric heater, since the shape of detection piece is annular structure, it is advantageous to increase the identification range of foreign matter, reduce the blind area and dead angle of detection, in turn, it is advantageous to improve the detection accuracy of detection piece, so as to avoid the scald of human body part or the fire caused by foreign matter being grilled and burned, it is advantageous to improve the use safety of electric heater, reduce the security risk when electric heater is used to send heat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric heater, in particular to an electric heater. BACKGROUND

[0002] With the development of electric appliance technology, electric heater technology appears, which gradually replaces traditional heating methods such as fire burning and charcoal burning in cold regions. Electric heater uses electric energy as the main energy source, uses resistance heating, induction heating, electric arc heating, electron beam heating, infrared heating and medium heating, and provides heating for human body through direct contact, warm air convection, far infrared radiation and other ways.

[0003] In the traditional technology, the electric heater is generally placed at a relatively low position, such as the ground, during use. The temperature around the air outlet grid of the electric heater is a high temperature area. When the human body or other objects are close to the air outlet grid of the electric heater, safety problems such as human body scalding or object high temperature roasting and burning are likely to occur. Most of the traditional electric heaters detect and identify the approach of foreign matter by setting sensors, but the accuracy is generally low. SUMMARY

[0004] Therefore, it is necessary to provide an electric heater which can effectively improve the accuracy of foreign matter detection of the electric heater and reduce the safety hazards during use.

[0005] The technical scheme is as follows: an electric heater, comprising: a heating body, the heating body is provided with a heat dissipation port, the heat dissipation port is used for discharging hot air; a detection piece, the shape of the detection piece is annular structure, the detection piece is located on the heating body, the heat dissipation port is located in the inner ring space of the detection piece, the detection piece is electrically connected with the heating body, and the detection piece is used for detecting foreign matter within a preset distance relative to the heat dissipation port.

[0006] The above-mentioned electric heater, during use, the heating body starts to discharge hot air to the outside through the heat dissipation port, and the detection piece starts to work. When the human body part or other foreign matter approaches the heat dissipation port and is within a preset distance relative to the heat dissipation port, the detection piece senses the existence of the foreign matter, so as to stop the heating of the heating body. When the foreign matter is away from the preset distance relative to the heat dissipation port, the heating body resumes normal work. Since the shape of the detection piece is annular structure, it is beneficial to increase the identification range of the foreign matter, reduce the blind area and dead angle of detection, and further improve the detection accuracy of the detection piece, so as to avoid the scalding of the human body part or the roasting and burning of the foreign matter, or the electric heater changes the position and continuously discharges hot air to combustible materials such as wooden floor, carpet and the like without supervision, which leads to fire. It is beneficial to improve the use safety of the electric heater and reduce the safety hazards during use of the electric heater.

[0007] In one of the embodiments, the detecting member is an inductive coil, which is used to generate an inductive magnetic field within the preset distance to induce the foreign matter.

[0008] The electric heater further comprises a controller, the detecting member is electrically connected with the heating body through the controller, the controller is used to acquire the detection signal emitted by the detecting member and control the start or stop of the heating body according to the detection signal.

[0009] In one of the embodiments, the detecting member is located at the circumferential port wall of the heat dissipation port; or, the inner ring space of the detecting member is larger than the size of the heat dissipation port, and the inner wall of the detecting member is spaced apart from the inner port wall of the heat dissipation port.

[0010] In one of the embodiments, if the inner ring space of the detecting member is larger than the size of the heat dissipation port, the heating body is provided with a first mounting groove, the first mounting groove is an annular groove, the heat dissipation port is located in the inner ring space of the first mounting groove, the size of the detecting member matches the size of the first mounting groove, and the detecting member is mounted in the first mounting groove.

[0011] In one of the embodiments, the electric heater further comprises a fixing frame and a first protective cover, the fixing frame is mounted in the first mounting groove, the side of the fixing frame away from the heating body is provided with a fixing groove, the detecting member is mounted in the fixing groove, and the first protective cover covers the fixing groove.

[0012] In one of the embodiments, the electric heater further comprises an air outlet grid, the air outlet grid covers the heat dissipation port, the air outlet grid is provided with an air outlet communicated with the heat dissipation port, and the detecting member is arranged on the side of the air outlet grid facing the heating body or the side of the air outlet grid away from the heating body.

[0013] In one of the embodiments, the side of the air outlet grid away from the heating body is provided with a second mounting groove, the second mounting groove is an annular groove, the length direction of the second mounting groove is arranged along the circumference of the air outlet grid, the size of the detecting member matches the size of the second mounting groove, and the detecting member is mounted in the second mounting groove; the electric heater further comprises a second protective cover, and the second protective cover covers the second mounting groove.

[0014] In one of the embodiments, the heating body comprises a heating member and a heating shell, the heating member is arranged in the heating shell, the heat dissipation port is arranged on the heating shell, the detecting member is electrically connected with the heating member, and the detecting member is used to control the start or stop of the heating member.

[0015] An electric heater includes: a heating body having a heat dissipation vent for discharging hot air; and a plurality of detection elements arranged circumferentially around the heat dissipation vent, each detection element being electrically connected to the heating body, and each detection element being used to detect foreign objects within a preset distance relative to the heat dissipation vent.

[0016] In the aforementioned electric heater, after the heating element is activated, it exhausts hot air to the outside through the heat dissipation vent. Simultaneously, the detection element is activated. When a human body or other foreign object approaches the heat dissipation vent and is within a preset distance from the vent, the detection element senses the presence of the foreign object and stops the heating element from heating. When the foreign object moves away from the preset distance from the heat dissipation vent, the heating element resumes normal heating. Since there are multiple detection elements spaced around the vent, the detection range for foreign objects is increased, blind spots and dead angles are reduced, and the detection accuracy is improved. This helps prevent burns to human body parts or burning of foreign objects, or fires caused by the heater continuously exhausting hot air onto flammable materials such as wooden floors and carpets when the heater is moved and left unattended. This improves the safety of the electric heater and reduces safety hazards during its use.

[0017] In one embodiment, the plurality of detection elements are one or a combination of at least two of the following: ultrasonic sensors, microwave sensors, infrared sensors, light sensors, and radar sensors. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the electric heater described in one embodiment;

[0021] Figure 2 for Figure 1 A schematic diagram of the exploded structure of a Chinese electric heater;

[0022] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the tested component;

[0023] Figure 4 This is a schematic diagram of the structure of the electric heater described in another embodiment;

[0024] Figure 5 for Figure 4 Exploded view of the components of a Chinese electric heater;

[0025] Figure 6 This is a schematic diagram of the structure of the electric heater described in another embodiment;

[0026] Figure 7 for Figure 6 An exploded view of the components of a medium-sized electric heater.

[0027] Explanation of reference numerals in the attached figures:

[0028] 100. Electric heater; 110. Heating body; 111. Heat dissipation vent; 112. Heating element; 113. First mounting slot; 114. Second mounting hole; 115. Third protective cover; 120. Detection piece; 121. Fixing frame; 122. First protective cover; 123. Fixing slot; 130. Air outlet grille; 131. Air outlet; 132. Second mounting slot; 133. First mounting hole; 140. Second protective cover. Detailed Implementation

[0029] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] Please see Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of the electric heater 100 according to an embodiment of the present invention is shown. Figure 1 ; Figure 2 It shows Figure 1An exploded view of the electric heater 100 is shown in one embodiment of the present invention. The electric heater 100 includes a heating body 110 and a detection element 120. The heating body 110 has a heat dissipation vent 111 for discharging hot air. The detection element 120 has a ring shape and is located on the heating body 110. The heat dissipation vent 111 is located in the inner ring space of the detection element 120. The detection element 120 is electrically connected to the heating body 110 and is used to detect foreign objects within a preset distance relative to the heat dissipation vent 111.

[0036] In operation, the electric heater 100, after its heating element 110 is activated, exhausts hot air to the outside through the heat dissipation vent 111. Simultaneously, the detection element 120 is activated. When a human body or other foreign object approaches the heat dissipation vent 111 and is within a preset distance from it, the detection element 120 senses the presence of the foreign object and stops the heating element 110 from heating. When the foreign object moves away from the preset distance from the heat dissipation vent 111, the heating element 110 resumes normal heating operation. Because the detection element 120 has a ring-shaped structure, it increases the detection range for foreign objects, reduces blind spots and dead angles, and thus improves the detection accuracy. This prevents burns to human body parts or burning of foreign objects, or fires caused by the electric heater 100 continuously exhausting hot air onto flammable materials such as wooden floors or carpets when unattended after being moved. This improves the safety of the electric heater 100 and reduces potential safety hazards during its operation.

[0037] It should be noted that the detection element 120 is used to detect foreign objects within a preset distance relative to the heat dissipation vent 111. This should be understood as the detection element 120 forming a detection range of a preset distance around the heat dissipation vent 111 when it is working. Within this range, if a foreign object enters, it can be detected by the detection element 120, thereby disconnecting the power supply to the heating body 110 and causing the heating body 110 to stop supplying heat. After the foreign object leaves the detection range, the detection element 120 controls the heating body 110 to resume power supply and start supplying heat.

[0038] Optionally, the preset distance ranges from 0cm to 5cm. For example, the preset distance is 3cm. Therefore, any foreign object within 3cm of the heat dissipation vent 111 can be detected by the detection element 120.

[0039] Specifically, please refer to Figure 2The detection element 120 is an induction coil, which generates an induced magnetic field within a preset distance to detect foreign objects. When the detection element 120 is energized, it generates an electromagnetic field within that range, completely covering the location of the heat dissipation vent 111. When a foreign object approaches the heat dissipation vent 111, it alters the intensity of the electromagnetic field, thus being detected by the detection element 120. When the heating element 110 receives this change in electromagnetic field intensity, it disconnects the power to the heating element within the heating element 110, improving detection accuracy and preventing accidents, thereby enhancing the safety of the electric heater 100. Once the foreign object moves away from the high-temperature area of ​​the heat dissipation vent 111, the signal field of the induction coil returns to normal. When the heating element 110 receives the signal, it re-energizes the heating element within the heating element 110, restoring normal heating.

[0040] Furthermore, the electric heater 100 also includes a controller (not shown in the figure). The detection element 120 is electrically connected to the heating body 110 through the controller. The controller is used to acquire the detection signal emitted by the detection element 120 and control the heating body 110 to start or stop according to the detection signal. In this way, when the detection element 120 detects a foreign object, it generates a detection signal and transmits the detection signal to the controller, thereby energizing or de-energizing the heating body 110, thus controlling the start or stop of the heating body 110 and ensuring safe use.

[0041] Optionally, the detection element 120 is located on the circumferential wall of the heat dissipation port 111. For example, the detection element 120 is disposed on the circumferential inner wall of the heat dissipation port 111. Alternatively, the detection element 120 is disposed on the edge of the heat dissipation port 111.

[0042] In one embodiment, see Figure 1 and Figure 2 If the size of the inner ring space of the detection element 120 is larger than the size of the heat dissipation port 111, a first mounting groove 113 is provided on the heating body 110. The first mounting groove 113 is an annular groove, and the heat dissipation port 111 is located in the inner ring space of the first mounting groove 113. The size of the detection element 120 matches the size of the first mounting groove 113, and the detection element 120 is installed in the first mounting groove 113. In this way, installing the detection element 120 through the first mounting groove 113 helps to improve the installation stability of the detection element 120.

[0043] Further, please refer to Figure 3 , Figure 3 and Figure 2 , Figure 1 It shows Figure 2The exploded view of the detection component 120 shows that the electric heater 100 also includes a fixing frame 121 and a first protective cover 122. The fixing frame 121 is installed in the first mounting groove 113. A fixing groove 123 is provided on the side of the fixing frame 121 facing away from the heating body 110. The detection component 120 is installed in the fixing groove 123, and the first protective cover 122 covers the fixing groove 123. Specifically, the first protective cover is made of transparent material. Thus, when installing the detection component 120, the fixing frame 121 is installed in the first mounting groove 113, then the detection component 120 is fixed in the fixing groove 123, and the first protective cover 122 covers the fixing groove 123. The first protective cover 122 can protect the detection component 120, which helps to improve the service life of the detection component 120.

[0044] Optionally, the installation method of the fixed frame 121 and the first mounting groove 113 can be adhesive, snap-fit ​​connection, plug-in connection, screw connection, riveting, welding, magnetic connection or other connection methods, or a combination of two or more connection methods.

[0045] Specifically, the fixing frame 121 is installed on the first mounting groove 113 via a snap-fit ​​connection. This facilitates installation, ensures high reliability, and improves assembly efficiency. Furthermore, it simplifies maintenance and facilitates disassembly, enhancing the ease of maintenance of the testing component 120. This embodiment only provides one specific installation method for the fixing frame 121 on the first mounting groove 113, but it is not limited to this method.

[0046] In one embodiment, see Figure 1 and Figure 3 The electric heater 100 also includes an air vent grille 130, which covers the heat dissipation vent 111. The air vent grille 130 has an air outlet 131 communicating with the heat dissipation vent 111. A detection element 120 is located on the side of the air vent grille 130 facing the heating element 110, or on the side of the air vent grille 130 facing away from the heating element 110. Thus, the air vent grille 130 improves the structural integrity of the electric heater 100 and prevents foreign objects from entering the heating element 110, improving the safety of the electric heater 100. Furthermore, the detection element 120 can be positioned either inside or outside the air vent grille 130, allowing for reliable installation methods for different models of the electric heater 100, thereby improving the performance of the electric heater 100.

[0047] Optionally, the connection between the air outlet grille 130 and the heating body 110 can be a screw connection, bolt connection, plug-in connection, snap-fit ​​connection, adhesive connection, magnetic connection, riveting, or other connection methods. Alternatively, it can be a combination of two or more of the above connection methods.

[0048] Specifically, the heating element 110 is provided with a threaded post, and the air outlet grille 130 is fastened to the threaded post by screws. The screw connection method offers high reliability and helps ensure the connection stability between the air outlet grille 130 and the heating element 110. Furthermore, the screw connection method facilitates disassembly, improving maintenance convenience. This embodiment only provides one specific connection method between the heating element 110 and the air outlet grille 130, but it is not limited to this.

[0049] Further, please refer to Figure 4 and Figure 5 The air outlet grille 130 is made of plastic. Therefore, the plastic air outlet grille 130 does not shield the signal from the detection element 120, which helps ensure the operational stability of the detection element 120.

[0050] Please see Figure 4 and Figure 2 , Figure 5 A schematic diagram of the structure of an electric heater 100 according to an embodiment of the present invention is shown. Figure 4 ; Figure 4 It shows Figure 4 An exploded view of the components of the electric heater 100 shows that, in one embodiment, the air outlet grille 130 has a second mounting groove 132 on its side facing away from the heating body 110. The second mounting groove 132 is an annular groove, and its length is arranged along the circumference of the air outlet grille 130. The size of the detection element 120 matches the size of the second mounting groove 132, and the detection element 120 is installed within the second mounting groove 132. For example, please refer to... Figure 5 The heat dissipation vent 111 is rectangular in shape, and the detection element 120 is annular in shape, with its outer contour also rectangular. This design prevents the air outlet grille 130 from obstructing the detection area of ​​the detection element 120, thus ensuring the reliable operation of the detection element 120. Simultaneously, the first mounting slot 113 facilitates the installation and fixation of the detection element 120, further contributing to the overall performance of the electric heater 100.

[0051] In other embodiments, the shape of the heat dissipation vent 111 can also be a circle, ellipse, square, triangle, regular pentagon or other irregular shape in a plane, or a polygon or other irregular shape in three-dimensional space.

[0052] Further, please refer to Figure 1 and Figure 4 The electric heater 100 also includes a second protective cover 140, which covers the second mounting groove 132. For example, the second protective cover is transparent. In this way, the second protective cover 140 helps to protect the detection element 120 inside the second mounting groove 132, thereby improving the service life of the second detection element 120.

[0053] In one embodiment, seeFigure 6 and Figure 7 The heating body 110 includes a heating element 112 and a heating housing. The heating element 112 is disposed within the heating housing, and a heat dissipation vent 111 is disposed on the heating housing. The heating element 112 is used to exhaust hot air through the heat dissipation vent 111. A detection element 120 is electrically connected to the heating element 112 and is used to control the start or stop of the heating element 112. Thus, by disposing of the heating element 112 within the heating body 110 and controlling its on / off state through the detection element 120, the heating element 112 can be automatically turned on or off, thereby improving safety during use.

[0054] For example, the heating element 112 includes a fan and a heating element (not shown in the figure). The fan is positioned facing the heat dissipation port 111, and the heating element is positioned between the fan and the heating element. In this way, the heat generated by the heating element is blown out from the heat dissipation port 111 through the air outlet 131 on the air outlet grille 130 by the fan, thereby providing warm air to the user.

[0055] In other embodiments, the heat dissipation vent 111 may also be located on the side wall, top wall, bottom wall, or other locations of the heat-generating body 110.

[0056] In one embodiment, see Figure 6 and Figure 3 , Figure 7 A schematic diagram of the structure of an electric heater 100 according to an embodiment of the present invention is shown. Figure 6 , Figure 6 for Figure 7 An exploded view of the components of an electric heater 100 is shown in one embodiment of the present invention. The electric heater 100 includes a heating body 110 and a detection element 120. The heating body 110 is provided with a heat dissipation vent 111 for discharging hot air. The difference from the electric heater 100 in the above embodiment is that there are multiple detection elements 120, which are arranged circumferentially around the heat dissipation vent 111. Each detection element 120 is electrically connected to the heating body 110, and a single detection element 120 is used to detect foreign objects within a preset distance relative to the heat dissipation vent 111.

[0057] In the above-mentioned electric heater 100, after the heating body 110 is turned on, hot air is discharged to the outside through the heat dissipation vent 111. At the same time, the detection element 120 is activated. When a human body or other foreign object approaches the heat dissipation vent 111 and is within a preset distance from the heat dissipation vent 111, the detection element 120 senses the presence of the foreign object, thereby stopping the heating body 110 from heating. When the foreign object leaves the preset distance from the heat dissipation vent 111, the heating body 110 resumes normal heating. Since there are multiple detection elements 120, which are spaced apart around the heat dissipation vent 111, it is beneficial to increase the detection range of foreign objects, reduce blind spots and dead angles, and thus improve the detection accuracy of the detection elements 120. This avoids burns to human body parts or burning of foreign objects, or fires caused by the electric heater 100 continuously discharging hot air to flammable materials such as wooden floors and carpets when the electric heater 100 is moved and left unattended. This helps to improve the safety of the electric heater 100 and reduce safety hazards when the electric heater 100 is used to provide heat.

[0058] Optionally, the plurality of detection elements 120 are one or a combination of at least two of the following: ultrasonic sensors, microwave sensors, infrared sensors, light sensors, and radar sensors.

[0059] Specifically, all detection components 120 are infrared sensors. This ensures high detection accuracy and reliability, which helps improve the accuracy of the electric heater 100 in detecting foreign objects, thereby enhancing the safety of the electric heater 100 in use.

[0060] Alternatively, there may be three detection elements 120. These three elements 120 are an ultrasonic sensor, an infrared sensor, and a microwave sensor, arranged at intervals along the circumference of the heat dissipation vent. This approach improves the safety of the electric heater 100 and, because the detection areas of different sensor types overlap, reduces blind spots and enhances the detection effectiveness. This embodiment provides only one specific implementation of multiple detection elements 120, but is not limited thereto.

[0061] Further, please refer to ​ The electric heater 100 also includes an air vent grille 130, which covers the heat dissipation vent 111 and has an air outlet 131 communicating with the heat dissipation vent 111. Multiple detection elements 120 are spaced apart along the edge of the air vent grille 130, or the detection elements 120 are disposed on the air vent grille 130. Specifically, the air vent grille 130 has a first mounting hole 133, and the heating body 110 has a second mounting hole 114. The multiple detection elements 120 are respectively mounted on the first mounting hole 133 and the second mounting hole 114. Thus, the air vent grille 130 can further improve the safety of the electric heater 100.

[0062] In one embodiment, see ​ The electric heater 100 also includes a third protective cover 115, which is multiple in number and corresponds one-to-one with the testing element 120. The third protective cover 115 is fitted onto the testing element 120. Specifically, the third protective cover 115 is made of transparent material. This helps to protect the testing element 120 and improves its service life.

[0063] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0064] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An electric heater, characterized in that, The electric heater includes: A heating element, wherein the heating element is provided with a heat dissipation vent for discharging hot air; The detection element is ring-shaped and located on the heating body. The heat dissipation port is located in the inner ring space of the detection element. The detection element is electrically connected to the heating body and is used to detect foreign objects within a preset distance relative to the heat dissipation port. The detection element is an induction coil, which is used to generate an induction magnetic field within the preset distance range to detect foreign objects; The preset distance ranges from 0cm to 5cm.

2. The electric heater according to claim 1, characterized in that, The electric heater also includes a controller. The detection element is electrically connected to the heating body through the controller. The controller is used to acquire the detection signal emitted by the detection element and control the heating body to start or stop according to the detection signal.

3. The electric heater according to claim 1, characterized in that, The detection element is located at the circumferential wall of the heat dissipation port; or, The inner ring space of the detection element is larger than the size of the heat dissipation port, and the inner wall of the detection element and the inner wall of the heat dissipation port are spaced apart.

4. The electric heater according to claim 3, characterized in that, If the size of the inner ring space of the detection element is larger than the size of the heat dissipation port, a first mounting groove is provided on the heating body. The first mounting groove is an annular groove. The heat dissipation port is located in the inner ring space of the first mounting groove. The size of the detection element matches the size of the first mounting groove. The detection element is installed in the first mounting groove.

5. The electric heater according to claim 3, characterized in that, The electric heater also includes a fixing frame and a first protective cover. The fixing frame is installed in the first mounting groove. The fixing frame has a fixing groove on the side facing away from the heating body. The detection component is installed in the fixing groove. The first protective cover is placed on the fixing groove.

6. The electric heater according to any one of claims 1-3, characterized in that, The electric heater also includes an air vent grille, which is disposed on the heat dissipation vent and has an air outlet communicating with the heat dissipation vent. The detection element is disposed on the side of the air vent grille facing the heating body, or the detection element is disposed on the side of the air vent grille facing away from the heating body.

7. The electric heater according to claim 6, characterized in that, The air outlet grille has a second mounting groove on the side facing away from the heating body. The second mounting groove is an annular groove, and its length is arranged along the circumference of the air outlet grille. The size of the detection element matches the size of the second mounting groove, and the detection element is installed in the second mounting groove. The electric heater also includes a second protective cover, which is placed on the second mounting groove.

8. The electric heater according to any one of claims 1-3, characterized in that, The heating body includes a heating element and a heating housing. The heating element is disposed inside the heating housing, and the heat dissipation vent is opened on the heating housing. The detection element is electrically connected to the heating element and is used to control the start or stop of the heating element.

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