PTC self-limiting heating wire

Abstract

This utility model relates to the field of heat tracing cables, and more particularly to a PTC self-limiting heating wire, comprising a wire body, which includes a heating core that generates heat when energized. The heating core is wrapped with a thin film, a first insulation layer, a second insulation layer, a third insulation layer, and a wear-resistant layer in sequence. The thin film serves as a moisture barrier. The outer wall of the first insulation layer and the inner wall of the second insulation layer are respectively provided with a spiral-shaped first groove and a second groove, which are correspondingly provided. A metal heat sink is spirally engaged and installed inside the first groove and the second groove, and the three are bonded and fixed together. The first groove and the second groove limit the metal heat sink and prevent it from falling off. The spiral distribution of the metal heat sink increases the heat dissipation area, improves the heat dissipation rate, and enhances the heating uniformity of the heating wire. The three-layer insulation structure enhances the insulation performance, extends the service life of the heating wire, and reduces safety hazards such as leakage.

Description

Technical Field

[0001] This utility model relates to the field of heat tracing cables, specifically a PTC self-limiting heating wire. Background Technology

[0002] PTC self-regulating heating wire is a heating element that utilizes the characteristics of PTC thermistors to achieve self-regulating temperature function. It has a wide range of applications in many fields. In industry, it is widely used in the anti-freezing and heat preservation areas of pipelines, valves, and monitoring instruments in oil and gas fields and chemical plants.

[0003] However, the existing technology has the following drawbacks: The existing heating wires have insufficient uniformity in heating, which can lead to localized excessively high or low temperatures, affecting performance and safety. The insulation layer's structural design is not reasonable enough, and it is prone to aging and damage after long-term use, increasing the risk of electrical leakage and other safety hazards. At the same time, the existing heating wires are inconvenient to install, lacking an effective fixing structure, which affects installation efficiency and stability. Utility Model Content

[0004] The purpose of this invention is to provide a PTC self-limiting heating wire to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a PTC self-limiting heating wire, comprising a wire body, the wire body comprising a heating core and a plurality of filler strips, the plurality of filler strips being bonded to a plurality of sidewalls of the heating core, the outer side of the heating core being sequentially covered with a thin film, a first insulating layer, a second insulating layer, a third insulating layer and a wear-resistant layer, a metal heat sink being provided on the outer side of the first insulating layer, and a plurality of fixing protrusions being uniformly provided on the outer side of the second insulating layer.

[0006] The above technical solution adopts a three-layer insulation structure design, which enhances insulation performance, extends the service life of the heating wire, reduces safety hazards such as leakage, and the wear-resistant layer enhances the wear resistance of the heating wire and extends its service life.

[0007] The heating core has a hexagonal cross-sectional shape, and all its edges are rounded and chamfered. The heating core is made of PTC thermistor material. The horizontal side of the filler strip is bonded with double-sided adhesive, and the width of the horizontal side of the filler strip is smaller than the width of the sidewall of the heating core.

[0008] The above technical solution features a polygonal cross-section for the heating core, which increases the contact area between the heating core and the first insulating layer, thus promoting uniform heat conduction.

[0009] The film is made of PET material and tightly covers the outside of the filler strip. The inside of the first insulating layer is coated with hot melt adhesive and the inside of the first insulating layer is bonded to the outside of the film. A threaded first slot is formed on the outside of the first insulating layer. The metal heat sink is threaded around the inside of the first slot. The inside of the first slot is uniformly coated with adhesive and the metal heat sink is bonded to the first slot.

[0010] Using the above technical solution, the film has moisture-proof properties and enhances the structural strength of the heating wire. The metal heat sink is made of copper material with good thermal conductivity.

[0011] The second insulating layer covers the outside of the metal heat sink. A threaded second slot is provided on the inner side of the second insulating layer, and the second slot is corresponding to the first slot. The inside of the second slot is uniformly coated with adhesive. The second slot is engaged and installed on the outside of the metal heat sink, and the two are bonded together.

[0012] Using the above technical solution, the first and second slots of the solution play a limiting role in the metal heat sink, preventing it from loosening and falling off.

[0013] The outer side of the second insulating layer is uniformly provided with a plurality of fixed protrusions. The length of the fixed protrusions is the same as the length of the second insulating layer, and the cross-sectional shape of the fixed protrusions is trapezoidal. The fixed protrusions are made of rubber.

[0014] The above technical solution features a fixed protrusion with a certain degree of elasticity, which facilitates a tight fit with the mounting base during installation and improves the stability of the heating wire installation.

[0015] The inner side of the third insulating layer is provided with a hot melt adhesive layer. The third insulating layer covers the outer side of the fixing protrusion and the two are bonded and fixed together. The first insulating layer, the second insulating layer and the third insulating layer are all made of polyvinyl chloride.

[0016] Using the above technical solution, the polyvinyl chloride material has good insulation properties, and the various layers of the line are bonded and fixed tightly to prevent them from falling off.

[0017] The outer side of the third insulating layer is covered with a wear-resistant layer, and several wear-resistant ridges are evenly distributed on the outer side of the wear-resistant layer.

[0018] By adopting the above technical solution, the wear-resistant textured surface enhances the wear resistance of the outer wall of the yarn, preventing it from being worn and cracked.

[0019] Compared with the prior art, the beneficial effects of this utility model are: This invention increases the heat dissipation area and improves heat dissipation efficiency by setting spiral metal heat sinks, effectively improving the heating uniformity of the heating wire, reducing the risk of local overheating, and improving the safety and reliability of use. The three-layer insulation structure design enhances the insulation performance, extends the service life of the heating wire, reduces safety hazards such as leakage, and the setting of the fixing protrusion facilitates the installation and fixing of the heating wire, improves installation efficiency, and ensures the stability of the heating wire during use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0021] Figure 2 This is a top view of the top structure of this utility model.

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0023] Figure 4 This is a schematic diagram of the connection structure between the first insulating layer and the metal heat sink of this utility model.

[0024] Figure 5 This is a schematic diagram of the wear-resistant layer structure of this utility model.

[0025] In the diagram: 1. Wire body; 2. Heating core; 3. Filler strip; 4. Thin film; 5. First insulation layer; 6. Metal heat sink; 7. Second insulation layer; 8. Fixing protrusion; 9. Third insulation layer; 10. Wear-resistant layer; 11. First slot; 12. Second slot; 13. Wear-resistant texture. Detailed Implementation

[0026] Referring to the accompanying drawings, this utility model provides a PTC self-limiting heating wire, including a wire body 1. The wire body 1 includes a heating core 2 and several filler strips 3. The filler strips 3 are bonded to several side walls of the heating core 2. The outer side of the heating core 2 is sequentially covered with a thin film 4, a first insulating layer 5, a second insulating layer 7, a third insulating layer 9, and a wear-resistant layer 10. A metal heat sink 6 is provided on the outer side of the first insulating layer 5. Several fixing protrusions 8 are evenly provided on the outer side of the second insulating layer 7. The length of the filler strips 3 is the same as the length of the heating core 2.

[0027] The heating core 2 has a hexagonal cross-section and all its edges are rounded and chamfered. The heating core 2 is made of PTC thermistor material. The horizontal side of the filler strip 3 is bonded with double-sided adhesive, and the width of the horizontal side of the filler strip 3 is smaller than the width of the side wall of the heating core 2. The edges of the heating core 2 are located between the two filler strips 3.

[0028] The film 4 is made of PET material and is tightly wrapped around the outside of the filler strip 3. The inside of the first insulating layer 5 is coated with hot melt adhesive and is bonded to the outside of the film 4. A threaded first slot 11 is provided on the outside of the first insulating layer 5. The metal heat sink 6 is threaded around the inside of the first slot 11. The inside of the first slot 11 is uniformly coated with adhesive and is bonded to the first slot 11. The film 4 is wrapped in multiple layers around the outside of the filler strip 3.

[0029] The second insulating layer 7 covers the outside of the metal heat sink 6. The inner side of the second insulating layer 7 is provided with a threaded second slot 12, and the second slot 12 is correspondingly provided with the first slot 11. The inside of the second slot 12 is uniformly coated with glue. The second slot 12 is engaged and installed on the outside of the metal heat sink 6 and the two are bonded together. The metal heat sink 6 is spirally wound around the outside of the second insulating layer 7.

[0030] The outer side of the second insulating layer 7 is uniformly provided with a number of fixing protrusions 8. The length of the fixing protrusions 8 is the same as the length of the second insulating layer 7, and the cross-sectional shape of the fixing protrusions 8 is trapezoidal. The fixing protrusions 8 are made of rubber material and are elastic.

[0031] The inner side of the third insulating layer 9 is provided with a hot melt adhesive layer. The third insulating layer 9 covers the outer side of the fixing protrusion 8 and the two are bonded and fixed. The first insulating layer 5, the second insulating layer 7 and the third insulating layer 9 are all made of polyvinyl chloride, forming a multi-layer insulating structure.

[0032] The outer side of the third insulating layer 9 is covered with a wear-resistant layer 10, and a number of wear-resistant ridges 13 are evenly distributed on the outer side of the wear-resistant layer 10.

[0033] Working principle: During use, the heat generated by the heating core 2 is transferred to the metal heat sink 6 through the first insulation layer 5. The metal heat sink 6 dissipates the heat evenly. Due to the spiral structure and good thermal conductivity of the metal heat sink 6, the overall temperature distribution of the heating wire is uniform. The design of the three insulation layers—the first insulation layer 5, the second insulation layer 7, and the third insulation layer 9—ensures the insulation safety of the heating wire, while the fixing protrusion 8 ensures the stability of the heating wire after installation, facilitating practical application.

Claims

1. A PTC self-limiting heating wire, comprising a wire body (1), characterized in that: The line body (1) includes a heating core (2) and several filler strips (3). Several filler strips (3) are bonded to several side walls of the heating core (2). The outer side of the heating core (2) is sequentially covered with a thin film (4), a first insulating layer (5), a second insulating layer (7), a third insulating layer (9), and a wear-resistant layer (10). A metal heat sink (6) is provided on the outer side of the first insulating layer (5), and several fixing protrusions (8) are uniformly provided on the outer side of the second insulating layer (7).

2. The PTC self-limiting heating wire according to claim 1, characterized in that: The heating core (2) has a hexagonal cross-section and its edges are rounded and chamfered. The heating core (2) is made of PTC thermistor material. The horizontal side of the filler strip (3) is bonded with double-sided adhesive, and the width of the horizontal side of the filler strip (3) is smaller than the width of the side wall of the heating core (2).

3. The PTC self-limiting heating wire according to claim 1, characterized in that: The film (4) is made of PET material and is tightly wrapped around the outside of the filler strip (3). The inside of the first insulating layer (5) is coated with hot melt adhesive and the inside of the first insulating layer (5) is bonded to the outside of the film (4). A threaded first slot (11) is provided on the outside of the first insulating layer (5). The metal heat sink (6) is threaded around the inside of the first slot (11). The inside of the first slot (11) is uniformly coated with adhesive and the metal heat sink (6) is bonded to the first slot (11).

4. The PTC self-limiting heating wire according to claim 1, characterized in that: The second insulating layer (7) covers the outside of the metal heat sink (6). The inner side of the second insulating layer (7) is provided with a threaded second slot (12), and the second slot (12) is correspondingly opened with the first slot (11). The inside of the second slot (12) is uniformly coated with glue. The second slot (12) is engaged and installed on the outside of the metal heat sink (6) and the two are bonded together.

5. The PTC self-limiting heating wire according to claim 1, characterized in that: The outer side of the second insulating layer (7) is uniformly provided with a plurality of fixed protrusions (8). The length of the fixed protrusions (8) is the same as the length of the second insulating layer (7), and the cross-sectional shape of the fixed protrusions (8) is trapezoidal. The fixed protrusions (8) are made of rubber.

6. The PTC self-regulating heating wire according to claim 1, characterized in that: The inner side of the third insulating layer (9) is provided with a hot melt adhesive layer. The third insulating layer (9) covers the outer side of the fixing protrusion (8) and the two are bonded and fixed. The first insulating layer (5), the second insulating layer (7) and the third insulating layer (9) are all made of polyvinyl chloride.

7. The PTC self-limiting heating wire according to claim 1, characterized in that: The outer side of the third insulating layer (9) is covered with a wear-resistant layer (10), and a number of wear-resistant ridges (13) are evenly distributed on the outer side of the wear-resistant layer (10).

Images