Dry boil protection heater

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By directly welding the carrier component onto the thick-film heating device and having it contact the temperature sensing component, combined with the design of nuts, pressure blocks, and buffer pads, the problems of loose NTC chip resistors and inaccurate detection are solved, enabling rapid and accurate temperature detection and improving anti-dry-burning performance and safety.

CN224583348UActive Publication Date: 2026-07-31NINGBO GRAPHENE INNOVATION CENT CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: NINGBO GRAPHENE INNOVATION CENT CO LTD
Filing Date: 2025-08-20
Publication Date: 2026-07-31

AI Technical Summary

Technical Problem

Existing thick-film heating devices have insufficient anti-dry-burning performance, and NTC chip resistors are prone to loosening and deformation, resulting in inaccurate temperature detection and the risk of falling off, which affects safety.

Method used

The carrier component is directly welded to the heating area of the heating assembly, and the detection end of the temperature measuring element contacts the heating area. It is connected by nuts, pressure blocks and screws. High-temperature resistant materials and buffer pads are used to ensure contact stability. The signal lead is fixed by wire grooves and recesses to achieve fast and accurate temperature detection.

Benefits of technology

It improves the accuracy and speed of temperature detection, enhances anti-dry-burning performance, avoids the risk of NTC chip resistor detachment and leakage, and improves the safety and ease of maintenance of heating devices.

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Abstract

This utility model discloses an anti-dry-burning heater, comprising: a heating element, a support member, and a temperature measuring element. The support member is welded to the heating area of the heating element, and the temperature measuring element is disposed on the support member, with its detection end in contact with the heating area of the heating element. The temperature measuring element is used to detect the temperature of the heating element. Compared to existing temperature measuring elements that are soldered to the conductor pads of the heating element, this application directly welds the support member to the heating area of the heating element, facilitating direct contact between the detection end of the temperature measuring element and the heating area, thereby improving the accuracy and speed of temperature detection and thus enhancing its anti-dry-burning performance.

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Description

Technical Field

[0001] This utility model relates to the field of heater technology, and in particular to a heater that prevents dry burning. Background Technology

[0002] To ensure the safe operation of heaters, temperature monitoring is typically required to prevent damage from overheating. For example, in the field of thick-film heating devices, a thermistor is usually installed on the device to ensure its safe use. This thermistor serves to prevent dry burning and to measure temperature.

[0003] In existing technologies, NTC surface mount resistors (SMRs) are typically soldered to the ends of the heating element's pad conductors using reflow soldering or manual soldering. During soldering, the pad conductors react with the solder to connect the positive and negative terminals of the NTC resistor to the thermistor contacts on the pad conductors. The melting point of the solder is approximately 227°C. However, testing revealed that with repeated dry-burning cycles of the thick-film heating device, the resistance of the NTC resistor drifts due to loosening and deformation of the solder joints. This ultimately prevents the heating device from being powered off and protected against dry burning at normal temperatures, eventually causing the NTC resistor to detach and rendering the entire thick-film heating device unusable. Furthermore, detached NTC resistors pose risks of leakage and short circuits, impacting the safety of the thick-film heating device. Additionally, the distance between the NTC resistor and the heating area of the thick-film heater results in temperature measurement lag and low accuracy.

[0004] Therefore, how to improve the anti-dry-burning performance of heaters is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this invention is to provide a dry-burning-proof heater that can effectively improve its dry-burning-proof performance.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A dry-burning-proof heater includes: a heating component, a support member, and a temperature measuring element. The support member is welded to the heating area of the heating component, and the temperature measuring element is disposed on the support member with its detection end in contact with the heating area of the heating component. The temperature measuring element is used to detect the temperature of the heating component.

[0008] In some embodiments, the heating assembly includes a thick-film heating tube and a thick-film circuit layer disposed on the surface of the thick-film heating tube, the carrier is fixed on the thick-film heating tube, and the detection end of the temperature measuring element is in contact with the thick-film circuit layer.

[0009] In some embodiments, the support member includes a nut, a pressure block, and a screw. The nut is welded to the thick film heating tube. The pressure block has a fastening hole for the screw to pass through. The pressure block is connected to the nut by the screw. The temperature measuring element is disposed on the pressure block.

[0010] In some embodiments, the projection of the pressure block along the axial direction of the thick film heating tube is an arc-shaped structure.

[0011] In some embodiments, a predetermined gap is provided between the side of the pressure block facing the thick film circuit layer and the surface of the thick film circuit layer.

[0012] In some embodiments, the pressure block has a groove on the side opposite to the thick film circuit layer, and a through hole communicating with the groove is provided at the end of the pressure block away from the screw; the temperature measuring element includes a thermistor and a signal lead, the signal lead is placed in the groove, one end of the signal lead is connected to the thermistor, and the other end is led out from the groove, and the thermistor is exposed at the end of the through hole facing the thick film circuit layer.

[0013] In some embodiments, a recessed groove is provided at one end of the fastening hole away from the thick film circuit layer, the wire groove communicates with the recessed groove, the side wall of the recessed groove is provided with a lead hole for the signal lead to be led out, and the screw is also used to press the signal lead to be pressed against the bottom surface of the recessed groove.

[0014] In some embodiments, the support member is provided with a buffer pad on the side facing the heating assembly, the buffer pad being used to press the temperature measuring element against the surface of the heating area of the heating assembly.

[0015] In some embodiments, the carrier is provided with a receiving cavity for accommodating the buffer pad.

[0016] In some embodiments, the cushioning pad is a silicone cushioning pad.

[0017] Compared with existing technologies, the above technical solution has the following advantages:

[0018] This utility model provides an anti-dry-burning heater, comprising: a heating element, a carrier, and a temperature measuring element. The carrier is welded to the heating area of the heating element, and the temperature measuring element is disposed on the carrier, with its detection end in contact with the heating area of the heating element. The temperature measuring element is used to detect the temperature of the heating element. Compared to existing temperature measuring elements that are soldered to the conductor pads of the heating element, this application directly welds the carrier to the heating area of the heating element, facilitating direct contact between the detection end of the temperature measuring element and the heating area, thereby improving the accuracy and speed of temperature detection and thus enhancing its anti-dry-burning performance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A three-dimensional structural schematic diagram of an anti-dry-burning heater provided for a specific embodiment of this utility model;

[0021] Figure 2 A partial explosion-proof three-dimensional structural diagram of a dry-burning heater provided for a specific embodiment of this utility model;

[0022] Figure 3 for Figure 1 Side view of the anti-dry-burning heater in the middle;

[0023] Figure 4 for Figure 1 Schematic diagram of the structure of the load-bearing component and temperature measuring component;

[0024] Figure 5 for Figure 4 A schematic diagram of the structure of the pressing block.

[0025] The attached figures are labeled as follows:

[0026] 10-Heating component, 11-Thick film heating tube, 12-Thick film circuit layer;

[0027] 20-Bearing component, 21-Nut, 22-Pressure block, 221-Fasting hole, 222-Wire groove, 223-Counter groove, 224-Lead hole, 23-Screw, 24-Buffer pad;

[0028] 30-Temperature measuring element, 31-Thermistor, 32-Signal lead. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please refer to Figures 1 to 5 , Figure 1A three-dimensional structural schematic diagram of an anti-dry-burning heater provided for a specific embodiment of this utility model; Figure 2 A partial explosion-proof three-dimensional structural diagram of a dry-burning heater provided for a specific embodiment of this utility model; Figure 3 for Figure 1 Side view of the anti-dry-burning heater in the middle; Figure 4 for Figure 1 Schematic diagram of the structure of the load-bearing component and temperature measuring component; Figure 5 for Figure 4 A schematic diagram of the structure of the pressing block.

[0031] This utility model provides an anti-dry-burning heater, comprising: a heating component 10, a carrier 20, and a temperature measuring element 30. The carrier 20 is welded to the heating area of the heating component 10, for example, by spot welding. The carrier 20 serves as the mounting carrier for the temperature measuring element 30 and can be a pre-installed structure on the heating component 10 for ease of subsequent assembly. The temperature measuring element 30 is located on the carrier 20, and its detection end contacts the heating area of the heating component 10. The temperature measuring element 30 is used to detect the temperature of the heating component 10. Compared to existing methods where the temperature measuring element 30 is soldered to the conductor pad of the heating component 10, this application directly welds the carrier 20 to the heating area of the heating component 10, facilitating direct contact between the detection end of the temperature measuring element 30 and the heating area, thereby improving the accuracy and speed of temperature detection and enhancing its anti-dry-burning performance.

[0032] In some embodiments, such as Figure 1 As shown, the heating assembly 10 includes a thick-film heating tube 11 and a thick-film circuit layer 12 disposed on the surface of the thick-film heating tube 11. The thick-film circuit layer 12 can be printed on the outer arc surface of the thick-film heating tube 11. The thick-film circuit layer 12 is a heating layer that generates heat when energized. A carrier 20 is fixed to the thick-film heating tube 11, and the detection end of the temperature sensing element 30 is in contact with the thick-film circuit layer 12 to improve the speed and accuracy of temperature detection. Besides being fixed to the thick-film heating tube 11 via the carrier 20, the carrier 20 can also be fixed to the thick-film circuit layer 12, or simultaneously fixed to both the thick-film heating tube 11 and the thick-film circuit layer 12. It should be noted that the above-described thick-film heating tube 11 is only a preferred structural form; other shapes, such as heating elements, can also be used.

[0033] In some embodiments, such as Figure 2As shown, the support component 20 includes a nut 21, a pressure block 22, and a screw 23. The nut 21 is welded to the thick-film heating tube 11. For example, the nut 21 can be welded to the thick-film heating tube 11 by spot welding. The welding of the nut 21 and the thick-film heating tube 11 is resistance welding. This welding method has the advantages of being fast and efficient. The tensile strength after welding can reach 1.5~2.5KN, and the structure is simple. Compared with the traditional soldering method, it can prevent the nut 21 from detaching from the thick-film heating tube 11. The pressure block 22 is made of a high-temperature material that can withstand temperatures above 250℃. It can be a ceramic powder sintered part or a special plastic such as PEKK. The pressure block 22 is provided with a fastening hole 221 for the screw 23 to pass through. The pressure block 22 is connected to the nut 21 by the screw 23. The temperature measuring element 30 is provided on the pressure block 22. The pressure block 22 and nut 21 are connected by screws 23, which is a detachable connection. When the temperature measuring element 30 is damaged, the pressure block 22 can be removed and replaced, which can effectively improve the convenience of maintenance.

[0034] In some embodiments, such as Figure 3 As shown, the projection of the pressure block 22 along the axial direction of the thick-film heating tube 11 is an arc-shaped structure. The arc-shaped pressure block 22 and the thick-film heating tube 11 share the same center. This arc shape facilitates the fitting of the pressure block 22 and the thick-film heating tube 11, thereby ensuring contact between the temperature sensing element 30 and the thick-film circuit layer 12. To facilitate the connection of the screw 23, a flat surface can be provided at the end of the fastening hole 221 away from the thick-film heating tube 11. A shim can be placed between the screw head of the screw 23 and the flat surface at the end of the fastening hole 221 to improve the fastening effect of the screw 23. The curvature of the pressure block 22 can be selected according to actual needs; this embodiment does not limit this.

[0035] In some embodiments, such as Figure 3 As shown, a preset gap is provided between the side of the pressure block 22 facing the thick film circuit layer 12 and the surface of the thick film circuit layer 12, that is, the pressure block 22 does not directly contact the thick film circuit layer 12, so as to avoid the heat of the thick film circuit layer 12 being directly transferred to the pressure block 22, and also to avoid the pressure block 22 occupying the area of the thick film circuit layer 12, thereby ensuring the heating performance of the thick film circuit layer 12.

[0036] In some embodiments, such as Figure 4 and Figure 5As shown, a groove 222 is provided on the side of the pressure block 22 away from the thick film circuit layer 12. When the pressure block 22 has an arc-shaped structure, a groove 222 extending in the circumferential direction can be provided on the outer arc surface of the pressure block 22. A through hole communicating with the groove 222 is provided at the end of the pressure block 22 away from the screw 23. That is, the through hole and the fastening hole 221 are located at the two ends of the pressure block 22, respectively. The temperature measuring element 30 includes a thermistor 31 and a signal lead 32. The thermistor 31 is preferably an NTC thermistor 31. The signal lead 32 is placed within the wire groove 222 to improve the positional stability of the signal lead 32 on the pressure block 22. One end of the signal lead 32 is connected to the thermistor 31, and the other end is led out from the wire groove 222. The pressure block 22 supports the signal lead 32, which avoids the influence of the heating component 10 on the signal lead 32, thereby ensuring the safety of the signal lead 32. The thermistor 31 is exposed at one end facing the thick film circuit layer 12 through the through hole to facilitate contact with the thick film circuit layer 12. In actual operation, the thermistor 31 can directly measure the surface temperature of the heating circuit layer and then feed it back to the control circuit through the signal lead 32. When the temperature exceeds the preset temperature value, the control circuit disconnects to prevent dry burning.

[0037] In some embodiments, such as Figure 4 and Figure 5 As shown, a groove 223 is provided at one end of the fastening hole 221 away from the thick film circuit layer 12, and the wire groove 222 is connected to the groove 223, as shown. Figure 5 As shown, the left end of the wire groove 222 extends into the recessed groove 223. The side wall of the recessed groove 223 is provided with a lead hole 224 for the signal lead 32 to be led out. The screw 23 is also used to press the signal lead 32 into the bottom surface of the recessed groove 223. For example, during assembly, the signal lead 32 is first placed in the wire groove 222 and one end is led out from the lead hole 224. Then, the screw 23 is tightened to restrict the section of the signal lead 32 passing through the recessed groove 223 within the recessed groove 223, thereby fixing the signal lead 32 and ensuring the positional stability of the signal lead 32, so as to avoid the signal lead 32 being pulled and causing the thermistor 31 to separate from the thick film circuit layer 12.

[0038] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the support member 20 is provided with a buffer pad 24 on the side facing the heating component 10. The buffer pad 24 is preferably a silicone buffer pad. The buffer pad 24 can be set on the end of the pressure block 22 away from the screw 23, and the buffer pad 24 is located between the pressure block 22 and the heating component 10. The buffer pad 24 can press the temperature measuring element 30 against the heating area surface of the heating component 10, thereby ensuring the contact effect between the temperature measuring element 30 and the heating component 10.

[0039] In some embodiments, the carrier 20 is provided with a receiving cavity for accommodating the buffer pad 24. For example, the buffer pad 24 is an annular structure, and the thermistor 31 extends from the middle of the buffer pad 24. The shape of the receiving cavity is adapted to the outer contour of the buffer pad 24. For example, the receiving cavity can be a circular chamber. The stability of the buffer pad 24 disposed on the carrier 20 can be improved by the receiving cavity.

[0040] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0041] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0042] The present invention provides a detailed description of an anti-dry-burning heater. Specific examples have been used to illustrate the principle and implementation of the present invention. The descriptions of these embodiments are merely for the purpose of helping to understand the core idea of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A dry-burning prevention heater, characterized in that, include: The heating component (10), the carrier (20), and the temperature measuring component (30) are provided. The carrier (20) is welded to the heating area of the heating component (10). The temperature measuring component (30) is disposed on the carrier (20) and its detection end is in contact with the heating area of the heating component (10). The temperature measuring component (30) is used to detect the temperature of the heating component (10).

2. The anti-dry-burning heater according to claim 1, characterized in that, The heating assembly (10) includes a thick film heating tube (11) and a thick film circuit layer (12) disposed on the surface of the thick film heating tube (11). The carrier (20) is fixed on the thick film heating tube (11), and the detection end of the temperature measuring element (30) is in contact with the thick film circuit layer (12).

3. The anti-dry-burning heater according to claim 2, characterized in that, The support member (20) includes a nut (21), a pressure block (22) and a screw (23). The nut (21) is welded to the thick film heating tube (11). The pressure block (22) is provided with a fastening hole (221) for the screw (23) to pass through. The pressure block (22) is connected to the nut (21) by the screw (23). The temperature measuring element (30) is provided on the pressure block (22).

4. The anti-dry-burning heater according to claim 3, characterized in that, The projection of the pressure block (22) along the axial direction of the thick film heating tube (11) is an arc-shaped structure.

5. The anti-dry-burning heater according to claim 4, characterized in that, A preset gap is provided between the side of the pressure block (22) facing the thick film circuit layer (12) and the surface of the thick film circuit layer (12).

6. The anti-dry-burning heater according to claim 3, characterized in that, The pressure block (22) has a wire groove (222) on the side away from the thick film circuit layer (12). The pressure block (22) has a through hole communicating with the wire groove (222) at the end away from the screw (23). The temperature measuring element (30) includes a thermistor (31) and a signal lead (32). The signal lead (32) is placed in the wire groove (222). One end of the signal lead (32) is connected to the thermistor (31), and the other end is led out from the wire groove (222). The thermistor (31) is exposed at the end of the through hole facing the thick film circuit layer (12).

7. The anti-dry-burning heater according to claim 6, characterized in that, The fastening hole (221) has a recessed groove (223) at one end away from the thick film circuit layer (12). The wire groove (222) is connected to the recessed groove (223). The side wall of the recessed groove (223) has a lead hole (224) for the signal lead (32) to be led out. The screw (23) is also used to press the signal lead (32) into the bottom surface of the recessed groove (223).

8. The anti-dry-burning heater according to any one of claims 1 to 7, characterized in that, The support member (20) has a buffer pad (24) on the side facing the heating assembly (10), and the buffer pad (24) is used to press the temperature measuring element (30) against the heating area surface of the heating assembly (10).

9. The anti-dry-burning heater according to claim 8, characterized in that, The carrier (20) is provided with a receiving cavity for accommodating the buffer pad (24).

10. The anti-dry-burning heater according to claim 8, characterized in that, The cushioning pad (24) is a silicone cushioning pad.