Temperature control switch and electric heater

Abstract

The utility model relates to the technical field of electric heaters, in particular to a temperature control switch and an electric heater. The temperature control switch is applied to the electric heater, the electric heater comprises a ceramic tube, and the ceramic tube is provided with a heating circuit. The temperature control switch comprises a conductive piece, a temperature control piece and a shell; the temperature control piece is electrically connected with the conductive piece; the shell is provided with a mounting groove, and the temperature control piece is arranged in the mounting groove; the shell is provided with a heat conduction surface, the heat conduction surface is matched with the peripheral surface of the ceramic tube, and when the temperature control switch is installed on the ceramic tube, the heat conduction surface is arranged opposite to the peripheral surface of the ceramic tube; wherein the temperature control switch is electrically connected with the heating circuit through the conductive part, the temperature control part is used for detecting the temperature of the ceramic tube, and the temperature control part is used for disconnecting the electric connection with the heating circuit when the detected temperature is greater than or equal to a preset temperature. Through the mode, the heat conduction effect between the shell and the ceramic tube is enhanced, the problem that the temperature of the ceramic tube detected by the temperature control switch has deviation and delay is solved, and the problem of dry burning of the ceramic tube is further solved.

Description

Technical Field

[0001] This application relates to the field of electric heater technology, and more particularly to a temperature control switch and an electric heater. Background Technology

[0002] Electric heaters are core components of thermal management in fields such as smart bathrooms, new energy vehicles, and energy storage. An electric heater typically consists of a ceramic tube, electrodes, and a temperature control switch. The ceramic tube, containing the heating circuit, is the core heating element of the heater. The electrodes are fixed to the ceramic tube and electrically connected to the heating circuit. The electrodes are used to connect to external wires, thereby supplying power to the heating circuit and causing the ceramic tube to heat up. The temperature control switch detects the temperature of the liquid inside or near the ceramic tube and controls the power supply to the heating circuit to prevent the ceramic tube from burning dry.

[0003] In some related technologies, the ceramic tube is cylindrical, and the contact area between the temperature control switch and the ceramic tube is small, resulting in poor heat conduction between the temperature control switch and the ceramic tube. This causes the temperature control switch to detect the temperature of the ceramic tube with a large deviation and delay. Utility Model Content

[0004] The embodiments of this application aim to provide a temperature control switch and an electric heater, so as to at least improve the problem of deviation and delay in the temperature detection of the ceramic tube by the temperature control switch.

[0005] In order to solve the above-mentioned technical problems, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a temperature control switch applied to an electric heater, the electric heater including a ceramic tube with a heating circuit; the temperature control switch including a conductive element, a temperature control element, and a housing; the temperature control element being electrically connected to the conductive element; the housing having a mounting groove, the temperature control element being disposed within the mounting groove; the housing having a heat-conducting surface adapted to the outer circumferential surface of the ceramic tube, and when the temperature control switch is installed on the ceramic tube, the heat-conducting surface and the outer circumferential surface of the ceramic tube are positioned opposite each other; wherein, the temperature control switch is electrically connected to the heating circuit through the conductive element, the temperature control element is used to detect the temperature of the ceramic tube, and the temperature control element is used to disconnect the electrical connection with the heating circuit when the detected temperature is greater than or equal to a preset temperature.

[0007] In some embodiments, the temperature control switch is arc-shaped and extends circumferentially along the ceramic tube.

[0008] In some embodiments, a heat-conducting element is provided between the housing and the ceramic tube.

[0009] In some embodiments, the temperature control switch further includes a filler that fills the mounting groove.

[0010] In some embodiments, the temperature control is a temperature fuse, and the temperature control switch further includes a fluxing element that covers at least a portion of the temperature fuse.

[0011] In some embodiments, the flux contains arc-quenching particles.

[0012] Secondly, embodiments of this application provide an electric heater, the electric heater including a ceramic tube and a temperature control switch as described in any of the preceding claims: the ceramic tube is provided with a heating circuit.

[0013] In some embodiments, the electric heater further includes a first electrode, a second electrode, and a third electrode, all of which are disposed on the ceramic tube. The first electrode and the second electrode are electrically connected to both ends of the heating circuit, and the third electrode and the first electrode are electrically connected to the two conductive elements of the temperature control switch.

[0014] In some embodiments, the electric heater further includes tabs, two of which are electrically connected to the second electrode and the third electrode, respectively.

[0015] In some embodiments, the conductive element includes at least one of a pin and a wire.

[0016] In some embodiments, the outer circumferential surface of the ceramic tube is provided with a positioning groove, the positioning groove extending along the axial direction of the ceramic tube, and the outer surface of the temperature control switch is provided with a positioning boss, the positioning boss being at least partially located within the positioning groove.

[0017] In some embodiments, the electric heater further includes a flange through which the ceramic tube passes.

[0018] In the temperature control switch and electric heater embodiments of this application, the heat-conducting surface of the housing is adapted to the outer peripheral surface of the ceramic tube, so that the heat-conducting surface can be closely attached to the outer peripheral surface of the ceramic tube, which is beneficial to enhance the heat conduction effect between the housing and the ceramic tube, reduce the temperature difference between the temperature control switch and the ceramic tube, and reduce the temperature delay between the temperature control switch and the ceramic tube. That is, it improves the problem of temperature deviation and delay in temperature detection of the ceramic tube by the temperature control switch, and further improves the problem of dry burning caused by the temperature of the ceramic tube exceeding the preset temperature due to temperature detection deviation and delay.

[0019] The temperature control switch directly detects the temperature of the ceramic tube without needing to extend into the water channel of the ceramic tube, thus improving the problems of water channel obstruction and detection delay in the electric heater, reducing the dry burning time of the ceramic tube, and extending the life of the ceramic tube; furthermore, there is no need to have openings in the water channel cavity walls of the ceramic tube and the electric heater shell, thus improving the problem of high risk of water leakage in the electric heater.

[0020] When installing the temperature control switch, it can be directly installed in contact with the ceramic tube, which simplifies the installation process compared to installing the temperature sensor through an opening in the water channel wall of the ceramic tube or the electric heater casing. Furthermore, preventing the ceramic tube from dry-burning using a temperature sensor requires a controller and electrical connections between the controller, temperature sensor, and heating circuit, making the electric heater structurally complex, increasing the risk of failure, and making assembly cumbersome and costly. Therefore, this application helps reduce the complexity of the electric heater structure, increase reliability, simplify the assembly process, and reduce costs.

[0021] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0022] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0023] Figure 1 This is a schematic diagram of the structure of an electric heater according to an embodiment of this application;

[0024] Figure 2 yes Figure 1 Exploded view of the electric heater;

[0025] Figure 3 yes Figure 1 Exploded view of the medium temperature control switch;

[0026] Figure 4 This is a schematic diagram of the structure of a temperature control switch according to an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the structure of an electric heater according to another embodiment of this application.

[0028] The reference numerals in the detailed embodiments are as follows:

[0029] 100. Electric heater;

[0030] 1. Ceramic tube; 11. Positioning groove;

[0031] 2. Temperature control switch; 21. Conductive component; 22. Temperature control element; 23. Housing; 231. Mounting groove; 232. Clamping groove; 233. Heat-conducting surface; 234. Positioning boss; 24. Fluxing component; 25. Filler component; 26. Insulating component;

[0032] 3. First electrode; 4. Second electrode; 5. Third electrode; 6. Tab; 7. Flange. Detailed Implementation

[0033] To facilitate understanding of this application, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a more detailed account. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0035] In the description of the embodiments of this application, the technical 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 only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0036] In the description of the embodiments of this application, the terms "first," "second," etc., are used to define components merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0037] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0038] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0039] Please see Figure 1 This application provides an electric heater 100, which can be used to heat fluids, such as liquids and gases. In this embodiment, heating a liquid is used as an example. The electric heater 100 can be installed in smart toilets, new energy vehicles, and energy storage devices to heat the cleaning water in smart toilets, the battery heating fluid in new energy vehicles, and the battery heating fluid in energy storage devices.

[0040] Please see Figure 1 and Figure 2 The electric heater 100 includes a ceramic tube 1 and a temperature control switch 2. The ceramic tube 1 is equipped with a heating circuit (not shown), and the temperature control switch 2 is located on the ceramic tube 1. The heating circuit is used to heat the ceramic tube 1, and the temperature control switch 2 is used to control the on / off state of the power supply to the heating circuit, thereby controlling whether the heating circuit heats the ceramic tube 1.

[0041] For ceramic tube 1 mentioned above, please refer to Figure 1 and Figure 2 The ceramic tube 1 is cylindrical, and the water channel inside the ceramic tube 1 allows liquid to pass through, so that when the heating circuit heats the ceramic tube 1, the liquid passing through is heated.

[0042] The heating circuit described above (not shown in the figure) can be a conductive material coated on the surface of the ceramic tube 1, or a metal wire disposed inside the ceramic tube 1. It is understood that the heating circuit has at least two connection terminals; by applying voltage to the two connection terminals, current can be generated in the heating circuit, thereby generating heat.

[0043] For the temperature control switch 2 mentioned above, please refer to Figure 3As shown, the temperature control switch 2 includes a conductive element 21 and a temperature control element 22, with the temperature control element 22 electrically connected to the conductive element 21. The temperature control switch 2 is also electrically connected to the heating circuit via the conductive element 21. It is understood that the temperature control element 22 is not easily connected directly to the heating circuit; therefore, there are two conductive elements 21, with each end of the temperature control element 22 connected to the heating circuit via one of the two conductive elements 21. It is understood that the temperature control element 22 is connected in series with the heating circuit, thus allowing the temperature control element 22 to control the on / off state of the heating circuit. For example, one conductive element 21 is electrically connected to one end of the heating circuit, and the other conductive element 21 is electrically connected to one pole of an external power source; the other end of the heating circuit is connected to the other pole of the external power source, thus forming a complete circuit with the temperature control switch 2 connected in series with the heating circuit. Alternatively, the heating circuit comprises two segments, with the temperature control switch 2 connected in series between the two segments of the heating circuit, thus connecting the temperature control switch 2 in series with the heating circuit. Optionally, the temperature control element 22 is welded to the conductive element 21.

[0044] Temperature control 22 is used to detect the temperature of ceramic tube 1. Temperature control 22 disconnects the electrical connection with the heating circuit when the detected temperature is greater than or equal to a preset temperature. For example, disconnecting the electrical connection between two conductive elements 21 indirectly disconnects the electrical connection between temperature control 22 and the heating circuit. Exemplarily, temperature control 22 is a thermal fuse; when the temperature of temperature control 22 is greater than or equal to the preset temperature, temperature control 22 melts, thereby disconnecting the electrical connection between the two conductive elements 21. Temperature control 22 can be a tin-bismuth alloy, and its melting point can be adjusted by changing its alloy composition. It is understood that the preset temperature is higher than the possible temperature during storage and transportation of electric heater 100, for example, higher than the temperature inside a vehicle under summer sun, typically 50 degrees Celsius. Optionally, the preset temperature is 105 degrees Celsius, 110 degrees Celsius, or 120 degrees Celsius.

[0045] In some other embodiments, the temperature control 22 is a bimetallic switch. When the temperature of the temperature control 22 is greater than or equal to a preset temperature, the bimetallic strip deforms, causing the circuit of the temperature control 22 to break, thereby disconnecting the electrical connection between the two conductive elements 21. If the temperature of the temperature control 22 drops below the preset temperature, the bimetallic strip recovers its deformation, causing the circuit of the temperature control 22 to reconnect, thereby reconnecting the two conductive elements 21.

[0046] In this embodiment, the temperature control 22 is used as an example of a temperature fuse for illustration.

[0047] In some embodiments, the actual temperature at which the temperature control 22 disconnects the electrical connection between the two conductive elements 21 is at least 2 degrees lower than the preset temperature. Because the heat conduction from the ceramic tube 1 to the temperature control 22 is delayed and there is heat loss, the temperature of the temperature control 22 is lower than the temperature of the ceramic tube 1, and the temperature rise of the temperature control 22 is lag-dependent. Therefore, the above method can improve the problem that the electrical connection between the two conductive elements 21 remains unbroken even when the ceramic tube 1 is above the preset temperature.

[0048] In this embodiment, the temperature control switch 2 directly detects the temperature of the ceramic tube 1 without needing to extend into the water channel of the ceramic tube 1. Therefore, the temperature control switch 2 does not occupy the water channel, which helps to improve the problems of water channel occupancy and detection delay in the electric heater 100, reduces the dry-burning time of the ceramic tube 1, and extends the lifespan of the ceramic tube 1. The temperature control switch 2 can be attached to the outer surface of the ceramic tube 1 to detect its temperature, thus eliminating the need for openings in the ceramic tube 1, which helps to reduce the probability of water leakage and improves the problem of high leakage risk in the electric heater 100. It is understood that the electric heater 100 also includes a housing (not shown), and the temperature control switch 2 can be attached to the end of the ceramic tube 1 that extends out of the housing, thus eliminating the need for openings in the water channel cavity wall of the housing.

[0049] In some related technologies, preventing the ceramic tube 1 from dry-burning using a temperature sensor requires a controller and electrical connection between the controller, temperature sensor, and heating circuit. This makes the electric heater 100 structurally complex, cumbersome to assemble, and costly; the detection circuit is also complex and has a high risk of failure. Furthermore, the temperature sensor needs to be installed in an opening in the water channel cavity wall of the ceramic tube 1 or the electric heater 100 housing, and a corresponding sealing ring needs to be installed, making the installation process cumbersome. In this embodiment, however, there is no need for a controller, a temperature sensor, or electrical connection between the controller, temperature sensor, and heating circuit. There is also no need to install the temperature sensor in the opening of the ceramic tube 1 and install a sealing ring. This reduces the structural complexity of the electric heater 100, increases reliability, simplifies the assembly process, and reduces costs.

[0050] In some embodiments, please refer to Figure 3 The conductive component 21 includes a wire. The wire can be stranded or single-stranded, and the material can be copper, tin-plated copper, aluminum, etc. The wire is flexible and connects the temperature control switch 2 to the heating circuit electrically, such as by welding. This can improve the problem that the conductive component 21 and the heating circuit cannot make contact due to manufacturing tolerances, resulting in poor welding connection or poor welding effect.

[0051] In other embodiments, please refer to Figure 5The conductive element 21 includes leads. The leads can be metal wires, metal bars, or metal strips, and the material can be copper, tin-plated copper, aluminum, etc. The leads have a certain strength, and by connecting to the heating circuit through the leads, such as by soldering, the temperature control switch 2 can be fixed to the ceramic tube 1. Furthermore, because the leads have a certain strength, they are not easily deformed to the point of contacting other conductive parts of the electric heater 100 and causing a short circuit, such as the first electrode 3 described below. It is understood that the two conductive elements 21 can also be a wire and a lead, respectively.

[0052] In some embodiments, please refer to Figure 3 The temperature control switch 2 also includes a housing 23, which has a mounting groove 231. The temperature control element 22 is disposed within the mounting groove 231, thereby protecting the temperature control element 22, improving the problem of the temperature control element 22 being easily damaged due to exposure, and extending the service life of the temperature control switch 2. For further embodiments, please refer to... Figure 3 The housing 23 has a clamping groove 232 within the mounting groove 231, where the temperature control device 22 and the conductive element 21 can be clamped and fixed. Along the circumference of the ceramic tube 1, the two conductive elements 21 can extend from the same end of the housing 23, or from opposite ends of the housing 23. Optionally, the housing 23 is made of ceramic material and can be prepared by high-temperature sintering of ceramic powder.

[0053] In some embodiments, please refer to Figure 3 The temperature control switch 2 is provided with a heat-conducting surface 233, which is adapted to the outer peripheral surface of the ceramic tube 1. When the temperature control switch 2 is installed on the ceramic tube 1, the heat-conducting surface 233 is positioned opposite to the outer peripheral surface of the ceramic tube 1. For example, the heat-conducting surface 233 is disposed on the housing 23, and the curvature of the heat-conducting surface 233 is equal to the curvature of the outer peripheral surface of the ceramic tube 1. This allows the heat-conducting surface 233 to fit tightly against the outer peripheral surface of the ceramic tube 1, which enhances the heat conduction effect between the housing 23 and the ceramic tube 1, and also improves the connection stability between the housing 23 and the ceramic tube 1. By enhancing the heat conduction effect between the housing 23 and the ceramic tube 1, the temperature difference between the temperature control switch 2 and the ceramic tube 1 can be reduced, and the temperature delay between the temperature control switch 2 and the ceramic tube 1 can be reduced. This improves the problem of temperature deviation and delay in the temperature detection of the ceramic tube 1 by the temperature control switch 2, thereby improving the problem of the ceramic tube 1 overheating and drying due to temperature detection deviation and delay. Optionally, a heat-conducting component is provided between the housing 23 and the ceramic tube 1 to enhance the heat conduction between them. This component can be silicone grease, thermal adhesive, thermal sealant, or a thermally conductive sheet. When the heat-conducting component is thermal adhesive, it not only enhances the heat conduction between the housing 23 and the ceramic tube 1 but also increases the strength of the connection between the temperature control switch 2 and the ceramic tube 1, or the temperature control switch 2 can be directly bonded to the ceramic tube 1. The heat-conducting component can be a thermosetting material, but its curing temperature must be lower than a preset temperature.

[0054] In some embodiments, please refer to Figure 2 and Figure 3 The temperature control switch 2 is arc-shaped and extends circumferentially around the ceramic tube 1. For example, it can partially encircle the ceramic tube 1, which helps to enhance the heat conduction between the housing 23 and the ceramic tube 1, and strengthens the connection between the temperature control switch 2 and the ceramic tube 1. It also helps to reduce the height of the temperature control switch 2 protruding from the ceramic tube 1, making the electric heater 100 more compact and reducing the size of the external outline of the electric heater 100, which is beneficial for the electric heater 100 to be installed in a smaller space. Furthermore, after the electric heater 100 is installed on an external device, the installation space between the ceramic tube 1 and the external device is small. By having the temperature control switch 2 encircle the ceramic tube 1, the temperature control switch 2 can be installed in the small space between the ceramic tube 1 and the external device, solving the problem that the temperature control switch 2 cannot be installed on the ceramic tube 1 due to the small installation space between the ceramic tube 1 and the external device.

[0055] In some embodiments, please refer to Figure 2 and Figure 3 Along the axial direction of ceramic tube 1, the projection of temperature control switch 2 is fan-shaped.

[0056] In some embodiments, please refer to Figure 4 The temperature control switch 2 also includes a flux 24, which covers at least a portion of the thermal fuse. The flux 24 can be a fluxing resin, which facilitates the melting of the thermal fuse and accelerates its melting. In some embodiments, the flux 24 completely covers the thermal fuse. In some embodiments, the flux 24 covers the connection between the conductive element 21 and the thermal fuse, which facilitates the molten thermal fuse adsorbing onto both conductive elements 21, thereby accelerating the melting of the thermal fuse.

[0057] The flux 24 can be directly injected into the mounting groove 231 in a molten state, thus eliminating the need for an additional mold to solidify the flux 24 onto the thermal fuse. The flux 24 fills the gap between the thermal fuse and the inner wall of the mounting groove 231, facilitating heat conduction from the housing 23 to the thermal fuse. Understandably, the melting point of the flux 24 is lower than a preset temperature to mitigate the problem of the molten flux 24 causing the thermal fuse to blow; and the flux 24 becomes molten before the thermal fuse blows, accelerating its melting process as the thermal fuse begins to melt.

[0058] In some embodiments, the flux 24 contains arc-quenching particles. These particles can be arc-quenching sand, including but not limited to silica, which helps to mitigate the problem of overcurrent damage to the ceramic tube 1 caused by increased current through the heating circuit when the thermal fuse blows. The arc-quenching particles can be added to the flux 24 while it is molten, and then the molten flux 24 can be used to wrap around the thermal fuse.

[0059] In some embodiments, please refer to Figure 3 The temperature control switch 2 also includes a filler 25, which fills the mounting groove 231. The filler can be a curable material such as epoxy resin or adhesive. By filling the mounting groove 231 with the filler 25, the conductive element 21 and the temperature control element 22 can be wrapped and fixed within the mounting groove 231. This increases the firmness of the conductive element 21 and the temperature control element 22 in the housing 23 and protects them, enhancing the waterproof and dustproof performance of the temperature control switch 2. The filler 25 can be a thermosetting material, but its curing temperature must be lower than the preset temperature.

[0060] The filler 25 can be directly injected into the mounting groove 231 in a molten state to fill the gap between the temperature control 22 and the inner wall of the mounting groove 231, which helps to conduct heat from the housing 23 to the temperature control 22.

[0061] In some embodiments, please refer to Figure 2 and Figure 3 The outer circumferential surface of the ceramic tube 1 is provided with a positioning groove 11, which extends axially along the ceramic tube 1. The outer surface of the temperature control switch 2 is provided with a positioning boss 234, which is at least partially located within the positioning groove 11. Specifically, the positioning boss 234 can be located within the housing 23. The cross-section of both the positioning groove 11 and the positioning boss 234 can be rectangular. When the positioning boss 234 is located within the positioning groove 11, it limits the position of the temperature control switch 2 along the circumference of the ceramic tube 1, which helps improve the accuracy and efficiency of installing the temperature control switch 2 on the ceramic tube 1. Optionally, the positioning boss 234 is located on the heat-conducting surface 233.

[0062] In some embodiments, please refer to Figure 1 and Figure 2 The electric heater 100 also includes a first electrode 3 and a second electrode 4, both of which are disposed on the ceramic tube 1 and electrically connected to both ends of the heating circuit. The first electrode 3 and the second electrode 4 can be bonded to the ceramic tube 1 and can be pads, metal pillars, etc., such as copper sheets or copper pillars. External wires can be soldered to the first electrode 3 and the second electrode 4, thereby facilitating the electrical connection of the external wires to the heating circuit.

[0063] In some embodiments, please refer to Figure 1 and Figure 2 The electric heater 100 also includes a third electrode 5, which is disposed on the ceramic tube 1. The third electrode 5 and the first electrode 3 are electrically connected to the two conductive parts 21 of the temperature control switch 2, respectively. The third electrode 5 can be bonded to the ceramic tube 1 and can be a solder pad, a metal pillar, etc., such as a copper sheet or a copper pillar. The conductive parts 21 can be soldered to the first electrode 3 and the third electrode 5, thereby facilitating the series electrical connection of the temperature control switch 2 with the heating circuit.

[0064] In some embodiments, please refer to Figures 1 to 3 The conductive component 21 is fitted with an insulating component 26, such as a Teflon sleeve or plastic coating of the conductive component 21, which helps to improve the problem of leakage from the electric heater 100 to external equipment.

[0065] Understandably, please refer to Figure 1 and Figure 2 Since the temperature control switch 2 is attached to the ceramic tube 1, the first electrode 3, the second electrode 4, and the third electrode 5 are all spaced apart from the temperature control switch 2. Because the first electrode 3 and the second electrode 4 are directly electrically connected to the heating circuit, to ensure uniform heating, the first electrode 3 and the second electrode 4 are typically arranged radially opposite each other along the ceramic tube 1. Therefore, along the circumference of the ceramic tube 1, the first electrode 3, the temperature control switch 2, the second electrode 4, and the third electrode 5 are arranged sequentially.

[0066] Please see Figure 1 and Figure 2 When the two conductive elements 21 extend from both ends of the housing 23 along the circumference of the ceramic tube 1, the conductive element 21 connected to the third electrode 5 will pass through the second electrode 4. The insulating element 26 sleeved on the conductive element 21 can improve the problem of short circuit caused by the conductive element 21 contacting the second electrode 4.

[0067] Please see Figure 5 When the two conductive elements 21 extend from the same end of the housing 23 along the circumference of the ceramic tube 1, the conductive element 21 connected to the third electrode 5 will pass through the first electrode 3. The insulating element 26 sleeved on the conductive element 21 can improve the problem of short circuit caused by the conductive element 21 contacting the first electrode 3.

[0068] In some embodiments, please refer to Figure 1 and Figure 2 The electric heater 100 also includes tabs 6, with two tabs 6 electrically connected to the second electrode 4 and the third electrode 5, respectively. The tabs 6 extend from the ceramic tube 1, facilitating the electrical connection of external wires to the second electrode 4 and the third electrode 5 via the tabs 6. Furthermore, the tabs 6 can be directly plugged into an electrical connector, facilitating quick electrical connection between the electric heater 100 and external devices. Optionally, the tabs 6 are rectangular plates, such as the conductive tabs of a plug, for easy plugging into an electrical connector.

[0069] In some embodiments, the two tabs 6 are respectively welded to the second electrode 4 and the third electrode 5. The tabs 6 are directly welded to the second electrode 4 or the third electrode 5, which not only electrically connects the tabs 6 to the second electrode 4 or the third electrode 5, but also fixes the tabs 6 to the ceramic tube 1, which facilitates the installation of the tabs 6.

[0070] In some embodiments, please refer to Figure 1 and Figure 2 One conductive element 21 of the temperature control switch 2 is soldered to the first electrode 3, and the other conductive element 21 of the temperature control switch 2 is soldered to the tab 6, which is electrically connected to the third electrode 5. Soldering the conductive element 21 to the tab 6 or the first electrode 3 not only electrically connects the conductive element 21 to the tab 6 or the first electrode 3, but also enhances the strength of the connection. After the tab 6 is soldered to the third electrode 5, it becomes difficult to solder the third electrode 5 to the conductive element 21. Directly soldering the conductive element 21 to the tab 6 reduces the soldering difficulty of the conductive element 21 and improves the soldering effect. Furthermore, please refer to... Figure 5 If the tab 6 protrudes from the first electrode 3 along the axial direction of the ceramic tube 1, the conductive element 21 electrically connected to the tab 6 can be configured to be spaced apart from the first electrode 3 along the axial direction of the ceramic tube 1, so that the conductive element 21 electrically connected to the tab 6 is less likely to come into contact with the first electrode 3 and cause a short circuit.

[0071] In some embodiments, please refer to Figure 1 and Figure 2 The electric heater 100 also includes a flange 7 through which the ceramic tube 1 passes. The flange 7 can be interference-fitted with the ceramic tube 1, thus fixing the flange 7 and the ceramic tube 1 together. The flange 7 and the ceramic tube 1 can also be bonded together with adhesive to further enhance the connection's strength. The flange 7 is used to install the ceramic tube 1 onto external equipment, thereby isolating the ceramic tube 1 from the external equipment, improving the problem of heat transfer from the ceramic tube 1 to the external equipment causing temperature rise, and reducing heat loss from the ceramic tube 1. Optionally, the flange 7 is made of an insulating material, such as polystyrene, which helps reduce heat transfer from the ceramic tube 1 to the external equipment. Optionally, the flange 7 is made of an insulating material, such as polystyrene, which helps improve the problem of leakage current from the heating circuit to the external equipment.

[0072] In a further embodiment, the temperature control switch 2 abuts against the flange 7. When the temperature control switch 2 abuts against the flange 7, its position along the axial direction of the ceramic tube 1 is limited, which helps to improve the accuracy and efficiency of the installation of the temperature control switch 2 on the ceramic tube 1. Optionally, the temperature control switch 2 is bonded to the flange 7, further improving the firmness of the installation of the temperature control switch 2 on the ceramic tube 1.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above, which are not provided in detail for the sake of brevity; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A temperature control switch, characterized in that, Applied to an electric heater, the electric heater includes a ceramic tube, the ceramic tube is provided with a heating circuit, and the temperature control switch includes: Conductive components; A temperature control device is electrically connected to the conductive component; The housing has a mounting groove, and the temperature control switch is disposed in the mounting groove; the housing has a heat-conducting surface, which is adapted to the outer peripheral surface of the ceramic tube. When the temperature control switch is installed on the ceramic tube, the heat-conducting surface is positioned opposite to the outer peripheral surface of the ceramic tube. The temperature control switch is electrically connected to the heating circuit through the conductive element. The temperature control device is used to detect the temperature of the ceramic tube. The temperature control device is used to disconnect the electrical connection with the heating circuit when the detected temperature is greater than or equal to a preset temperature.

2. The temperature control switch according to claim 1, characterized in that, The temperature control switch is arc-shaped and extends circumferentially along the ceramic tube.

3. The temperature control switch according to claim 1, characterized in that, A heat-conducting element is provided between the shell and the ceramic tube; and / or, The temperature control switch also includes a filler, which is filled into the mounting groove.

4. The temperature control switch according to any one of claims 1 to 3, characterized in that, The temperature control device is a temperature fuse, and the temperature control switch also includes a fluxing element that covers at least a portion of the temperature fuse.

5. The temperature control switch according to claim 4, characterized in that, The flux contains arc-extinguishing particles.

6. An electric heater, characterized in that, include: Ceramic tube, equipped with heating circuit; The temperature control switch as described in any one of claims 1 to 5.

7. The electric heater according to claim 6, characterized in that, The electric heater further includes a first electrode, a second electrode, and a third electrode. The first electrode, the second electrode, and the third electrode are all disposed on the ceramic tube. The first electrode and the second electrode are electrically connected to the two ends of the heating circuit, and the third electrode and the first electrode are electrically connected to the two conductive parts of the temperature control switch.

8. The electric heater according to claim 7, characterized in that, The electric heater also includes tabs, two of which are electrically connected to the second electrode and the third electrode, respectively.

9. The electric heater according to claim 6, characterized in that, The conductive element includes at least one of a pin and a wire.

10. The electric heater according to claim 6, characterized in that, The outer circumferential surface of the ceramic tube is provided with a positioning groove, which extends along the axial direction of the ceramic tube; the outer surface of the temperature control switch is provided with a positioning boss, which is at least partially located within the positioning groove; and / or, The electric heater also includes a flange through which the ceramic tube passes.

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