A heating element device with dual thermal protection functions

Abstract

The utility model specifically relates to a heating element device with a dual thermal protection function, including a heating element body and a temperature controller arranged on the heating element body, the heating element body including a plain tube and a temperature sensing component and a heating element arranged on the outer periphery of the plain tube in sequence, the temperature sensing component including a temperature sensing circuit substrate provided with a first temperature sensing circuit, the temperature sensing circuit substrate having a side provided with the first temperature sensing circuit closely attached to the outer periphery of the plain tube; the heating element including a heating circuit substrate provided with a heating circuit, the heating circuit substrate having a second temperature sensing circuit inner electrode and a second temperature sensing circuit outer electrode respectively provided on both sides, the heating circuit substrate having a side provided with the heating circuit closely attached to the outer periphery of the temperature sensing component away from the plain tube, and the temperature controller being electrically connected to the heating circuit. Through the dual thermal protection structure design formed between the temperature sensing component, the heating element and the temperature controller, the heating temperature of the heating element device can be accurately controlled, and a better protection effect can be achieved, with high safety.

Description

Technical Field

[0001] The utility model relates to the technical field of heating elements, in particular to a heating element device with dual thermal protection functions. Background Art

[0002] In order to ensure the safe operation of the heating element device, the heating element device is generally required to be equipped with a temperature control system. The temperature control system monitors the change in the resistance of the heating element and feeds back to the host to determine whether the temperature exceeds the limit, and then controls the on and off of the heating element and the power supply through electrical signals to prevent temperature runaway or fire. However, this type of temperature control system generally requires additional components such as temperature sensors, and the monitoring of a single component cannot completely avoid or prevent the occurrence of temperature runaway or fire. In other words, it takes some time from the temperature abnormality to the triggering of power cut-off, and the feedback is slow, so there is still a certain risk. Based on this, it is necessary to propose a more reliable temperature control management method to prevent the temperature of the heating element from getting out of control or the occurrence of fire. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a heating element device with dual thermal protection functions.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A heating element device with dual thermal protection function, comprising a heating element body and a temperature controller arranged on the heating element body, the heating element body comprising a plain tube and a temperature sensing component and a heating component sequentially arranged on the outer periphery of the plain tube, the temperature sensing component comprising a temperature sensing circuit substrate provided with a first temperature sensing circuit, and a side of the temperature sensing circuit substrate provided with the first temperature sensing circuit is closely attached to the outer periphery of the plain tube;

[0006] The heating component includes a heating circuit substrate provided with a heating circuit, a second temperature-sensing circuit inner electrode is provided on one side of the heating circuit substrate, and a second temperature-sensing circuit outer electrode is provided on the other side of the heating circuit substrate, wherein the second temperature-sensing circuit inner electrode and the heating circuit are located on the same surface of the heating circuit substrate, and the heating circuit corresponds to the position of the first temperature-sensing circuit, the heating circuit substrate has a side provided with the heating circuit in close contact with the outer peripheral surface of the temperature-sensing component away from the element tube, and the temperature controller is electrically connected with the heating circuit.

[0007] Furthermore, a first temperature sensing circuit inner electrode is provided on one side of the temperature sensing circuit substrate with the first temperature sensing circuit, and a first temperature sensing circuit outer electrode is provided on the other side of the temperature sensing circuit substrate, and the positions of the first temperature sensing circuit inner electrode and the first temperature sensing circuit outer electrode correspond to each other.

[0008] Furthermore, the temperature sensing circuit substrate is provided with temperature sensing electrode conduction holes in regions corresponding to the first temperature sensing circuit inner electrode and the first temperature sensing circuit outer electrode.

[0009] Furthermore, a heating circuit inner electrode is provided on one side of the heating circuit substrate with the heating circuit, and the heating circuit inner electrode is connected to the heating circuit, and a heating circuit outer electrode is provided on the other side of the heating circuit substrate, and the positions of the heating circuit inner electrode and the heating circuit outer electrode correspond to each other.

[0010] Furthermore, the heating circuit substrate is provided with heating electrode conduction holes in the regions corresponding to the heating circuit inner electrodes and the heating circuit outer electrodes.

[0011] Furthermore, a side of the heating circuit substrate with the heating circuit is also provided with an internal electrode of a thermostat, the internal electrode of the thermostat is connected to the heating circuit, and a connecting through hole is provided in a region of the heating circuit substrate corresponding to the internal electrode of the thermostat.

[0012] Furthermore, a temperature controller lead outer electrode is provided on the other side of the heating circuit substrate corresponding to the temperature controller inner electrode area, and the temperature controller inner electrode is electrically connected to the temperature controller lead outer electrode via a connecting through hole.

[0013] Furthermore, a ceramic cap is provided at one end of the heating element body close to the outer electrode of the second temperature sensing circuit, and a connecting piece is provided between the heating element body and the ceramic cap.

[0014] Furthermore, the first temperature sensing circuit outer electrode is connected to the second temperature sensing circuit inner electrode through a temperature sensing electrode conducting hole, and a temperature sensing lead is welded to the second temperature sensing circuit outer electrode.

[0015] Furthermore, a heating lead is welded to the outer electrode of the heating circuit.

[0016] The beneficial effect of the utility model is that the utility model discloses a heating element device with a dual thermal protection function, wherein a combined structural design among a temperature sensing component, a heating component and a temperature controller is used, a first temperature sensing circuit is printed on a temperature sensing circuit substrate, and a second temperature sensing circuit inner / outer electrode, a temperature controller inner electrode and a temperature controller lead outer electrode are printed on the heating circuit substrate to form a dual circuit design, which can not only realize precise control of the heating temperature of the heating element device, but also enable the heating element device to have a dual thermal protection function, thereby effectively improving the operating safety of the heating element device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the heating element device of the utility model;

[0018] Figure 2 It is a schematic diagram of the state of the rolling process of the plain tube and the temperature sensing component of the utility model;

[0019] Figure 3 It is a structural schematic diagram of one side of the temperature sensing component of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the other side of the temperature sensing component of the utility model;

[0021] Figure 5 It is a structural schematic diagram of one side of the heating component of the utility model;

[0022] Figure 6 It is a structural schematic diagram of the other side of the heating component of the utility model.

[0023] The accompanying drawings are marked as follows: 1. thermostat; 2. heating element body; 3. plain tube; 4. temperature sensing circuit substrate; 401. first temperature sensing circuit; 402. inner electrode of first temperature sensing circuit; 403. outer electrode of first temperature sensing circuit; 404. temperature sensing electrode conduction hole; 5. heating circuit substrate; 501. heating circuit; 502. inner electrode of second temperature sensing circuit; 503. outer electrode of second temperature sensing circuit; 504. inner electrode of heating circuit; 505. outer electrode of heating circuit; 506. heating electrode conduction hole; 507. inner electrode of thermostat; 508. connecting through hole; 509. outer electrode of thermostat lead; 6. ceramic cap; 7. connecting piece; 8. temperature sensing lead; 9. heating lead. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0025] Example 1

[0026] like Figure 1-6 As shown, this embodiment provides a heating element device with dual thermal protection function, including a heating element body 2 and a thermostat 1 arranged on the heating element body 2, the heating element body 2 includes a plain tube 3 and a temperature sensing component and a heating component sequentially arranged on the outer periphery of the plain tube 3, the temperature sensing component includes a temperature sensing circuit substrate 4 provided with a first temperature sensing circuit 401, and a side of the temperature sensing circuit substrate 4 provided with the first temperature sensing circuit 401 is closely attached to the outer periphery of the plain tube 3;

[0027] The heating component includes a heating circuit substrate 5 provided with a heating circuit 501, a second temperature sensing circuit inner electrode 502 is provided on one side of the heating circuit substrate 5, and a second temperature sensing circuit outer electrode is provided on the other side of the heating circuit substrate 5, wherein the second temperature sensing circuit inner electrode 502 and the heating circuit 501 are located on the same surface of the heating circuit substrate 5, and the heating circuit 501 corresponds to the position of the first temperature sensing circuit 401, the heating circuit substrate 5 provided with the heating circuit 501 is in close contact with the outer peripheral surface of the temperature sensing component away from the element tube 3, and the temperature controller 1 is electrically connected with the heating circuit 501.

[0028] In the present invention, by adopting the combined structural design of temperature sensing component, heating component and temperature controller, the first temperature sensing circuit 401 is printed on the temperature sensing circuit substrate 4, and the second temperature sensing circuit inner electrode / outer electrode 502 / 503, the temperature controller inner electrode 507 and the temperature controller lead outer electrode 509 are printed on the heating circuit substrate 5 to form a double circuit design, so that the heating element device has a double thermal protection function. Among them, the first temperature sensing circuit 401 design is all over the outer peripheral surface of the element tube 3, which can sense the temperature change of the heating element body 2 in real time. As the temperature changes, the corresponding resistance value also changes and is fed back to the external PLC; and the heating circuit 501 is used to heat the element tube 3, and the heating temperature of the element tube 3 is detected by setting the second temperature sensing circuit inner / outer electrode 502 / 503 on the heating circuit substrate 5, that is, the heating component can simultaneously play the role of heating the element tube 3 and detecting the temperature, and then realize the precise control of the heating temperature of the heating element device through temperature sensing. Furthermore, by directly connecting the thermostat 1 to the heating circuit 501, when the thermostat 1 is disconnected, the heating circuit 501 is also disconnected immediately without the assistance of external equipment, thereby achieving better circuit protection and enabling the heating element device to have a dual thermal protection function.

[0029] In this embodiment, the first temperature sensing circuit 401, the first temperature sensing circuit inner / outer electrodes 402 / 403, the heating circuit 501, the heating circuit inner / outer electrodes 504 / 505, and the second temperature sensing circuit inner / outer electrodes 502 / 503 are all printed on the temperature sensing circuit substrate 4 and the heating circuit substrate 5 by using a conductive paste using a screen printing process. The plain tube 3 is preferably, but not limited to, a ceramic tube. The interior of the heating circuit 501 is designed to be disconnected, and the thermostat 1 is connected to the heating circuit 501 to provide better protection.

[0030] Furthermore, the first temperature sensing circuit inner electrode 402 is provided on one side of the temperature sensing circuit substrate 4 with the first temperature sensing circuit 401, and the first temperature sensing circuit outer electrode 403 is provided on the other side of the temperature sensing circuit substrate 4, and the first temperature sensing circuit inner electrode 402 corresponds to the first temperature sensing circuit outer electrode 403. Specifically, the first temperature sensing circuit inner electrode 402 and the second temperature sensing circuit outer electrode 503 are both provided at one end of the element tube 3 close to the second temperature sensing circuit inner electrode 502 or the second temperature sensing circuit outer electrode 503.

[0031] Furthermore, the temperature sensing circuit substrate 4 is provided with temperature sensing electrode conducting holes 404 in the regions corresponding to the first temperature sensing circuit inner electrode 402 and the first temperature sensing circuit outer electrode 403 .

[0032] Furthermore, a heating circuit inner electrode 504 is provided on one side of the heating circuit substrate 5 with the heating circuit 501, and the heating circuit inner electrode 504 is connected to the heating circuit 501. A heating circuit outer electrode 505 is provided on the other side of the heating circuit substrate 5, and the positions of the heating circuit inner electrode 504 and the heating circuit outer electrode 505 correspond. Specifically, the heating circuit inner electrode 504 is located at one end of the heating circuit substrate 5 close to the first temperature sensing circuit inner electrode 402, and the heating circuit outer electrode 505 is located at one end of the heating circuit substrate 5 close to the second temperature sensing circuit outer electrode 503.

[0033] Furthermore, the heating circuit substrate 5 is provided with heating electrode conducting holes 506 in the regions corresponding to the heating circuit inner electrode 504 and the heating circuit outer electrode 505 .

[0034] Furthermore, a thermostat internal electrode 507 is provided on one side of the heating circuit substrate 5 with the heating circuit 501 . The thermostat internal electrode 507 is connected to the heating circuit 501 . A connecting through hole 508 is provided in the heating circuit substrate 5 corresponding to the thermostat internal electrode 507 .

[0035] Furthermore, a temperature controller lead outer electrode 509 is provided on the other side of the heating circuit substrate 5 corresponding to the temperature controller inner electrode area, and the temperature controller inner electrode 507 is electrically connected to the temperature controller lead outer electrode 509 via a connecting through hole 508 .

[0036] In this embodiment, the thermostat lead outer electrode 509 is connected to the thermostat inner electrode 507 and the heating circuit 501 through the connecting through hole 508 to form an internal and external connection, and the thermostat 1 is used as a bridge to form a loop to play a protective role.

[0037] Furthermore, a ceramic cap 6 is provided at one end of the heating body 2 close to the second temperature sensing circuit outer electrode 503, and a connecting piece 7 is provided between the heating body 2 and the ceramic cap 6. In this embodiment, the connecting piece 7 is preferably a flange.

[0038] Furthermore, the first temperature sensing circuit outer electrode 403 is electrically connected to the second temperature sensing circuit inner electrode 402 via the temperature sensing electrode conducting hole 404 , and the second temperature sensing circuit outer electrode 503 is welded with a temperature sensing lead 8 .

[0039] Furthermore, the heating circuit outer electrode 505 is welded with a heating lead 9 .

[0040] The temperature sensing circuit substrate 4 and the heating circuit substrate 5 in this embodiment are both flexible substrates, and are formed by rolling the temperature sensing circuit substrate 4 and the heating circuit substrate 5 on the outer circumference of the plain tube 3 in sequence, wherein the side of the temperature sensing circuit substrate 4 with the first temperature sensing circuit 401 is in contact with the outer circumference of the plain tube 3, and the side of the heating circuit substrate 5 with the heating circuit 501 is combined with the outer circumference of the temperature sensing circuit substrate 4 away from the plain tube 3, that is, the heating circuit outer electrode 505 and the second temperature sensing circuit outer electrode 503 are arranged on the outermost circumference of the heating body 2, which is convenient for welding the heating lead 9 and the temperature sensing lead 8.

[0041] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present invention is within the protection scope of the present invention.

Claims

1. A heating element device with dual thermal protection function, characterized in that: The invention comprises a heating element body and a temperature controller arranged on the heating element body, wherein the heating element body comprises a plain tube and a temperature sensing component and a heating component arranged on the outer periphery of the plain tube in sequence, wherein the temperature sensing component comprises a temperature sensing circuit substrate provided with a first temperature sensing circuit, and a surface of the temperature sensing circuit substrate provided with the first temperature sensing circuit is closely attached to the outer periphery of the plain tube; The heating component includes a heating circuit substrate provided with a heating circuit, a second temperature-sensing circuit inner electrode is provided on one side of the heating circuit substrate, and a second temperature-sensing circuit outer electrode is provided on the other side of the heating circuit substrate, wherein the second temperature-sensing circuit inner electrode and the heating circuit are located on the same surface of the heating circuit substrate, and the heating circuit corresponds to the position of the first temperature-sensing circuit, the heating circuit substrate has a side provided with the heating circuit in close contact with the outer peripheral surface of the temperature-sensing component away from the element tube, and the temperature controller is electrically connected with the heating circuit.

2. A heating element device with dual thermal protection function according to claim 1, characterized in that: A first temperature sensing circuit inner electrode is disposed on one side of the temperature sensing circuit substrate with the first temperature sensing circuit, and a first temperature sensing circuit outer electrode is disposed on the other side of the temperature sensing circuit substrate. The first temperature sensing circuit inner electrode corresponds to the first temperature sensing circuit outer electrode.

3. A heating element device with dual thermal protection function according to claim 2, characterized in that: The temperature sensing circuit substrate is provided with temperature sensing electrode conduction holes in the regions corresponding to the first temperature sensing circuit inner electrode and the first temperature sensing circuit outer electrode.

4. The heating element device with dual thermal protection function according to claim 1, characterized in that: The heating circuit substrate has a heating circuit on one side thereof and an inner heating circuit electrode connected to the heating circuit, and the other side thereof is provided with an outer heating circuit electrode, and the positions of the inner heating circuit electrode and the outer heating circuit electrode correspond to each other.

5. The heating element device with dual thermal protection function according to claim 4, characterized in that: The heating circuit substrate is provided with heating electrode conduction holes in the regions corresponding to the heating circuit inner electrodes and the heating circuit outer electrodes.

6. The heating element device with dual thermal protection function according to claim 4, characterized in that: The heating circuit substrate has a heating circuit on one side thereof and is provided with a thermostat inner electrode, the thermostat inner electrode is connected to the heating circuit, and a connecting through hole is provided in the heating circuit substrate corresponding to the thermostat inner electrode area.

7. The heating element device with dual thermal protection function according to claim 6, characterized in that: The other side of the heating circuit substrate is provided with a temperature controller lead outer electrode corresponding to the temperature controller inner electrode area, and the temperature controller inner electrode is electrically connected with the temperature controller lead outer electrode through a connecting through hole.

8. The heating element device with dual thermal protection function according to claim 1, characterized in that: A ceramic cap is provided at one end of the heating element body close to the outer electrode of the second temperature sensing circuit, and a connecting piece is provided between the heating element body and the ceramic cap.

9. The heating element device with dual thermal protection function according to claim 2, characterized in that: The first temperature sensing circuit outer electrode is electrically connected to the second temperature sensing circuit inner electrode through a temperature sensing electrode conducting hole, and a temperature sensing lead is welded to the second temperature sensing circuit outer electrode.

10. The heating element device with dual thermal protection function according to claim 4, characterized in that: The outer electrodes of the heating circuit are welded with heating leads.

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