High power density flexible heater

Abstract

This utility model discloses a high power density flexible heater, comprising a strip-shaped and bendable heating element and a cable connected to at least one end of the heating element; the heating element includes a flexible and high-temperature resistant central support, a heating wire, and a flexible and high-temperature resistant insulating shell; the heating wire is spirally wound around the outer periphery of the central support to form a spiral heating structure; the insulating shell covers the outer periphery of the heating structure; the cable is electrically connected to the heating wire. This utility model's high power density flexible heater features high power density performance; it has the characteristics of fast heating speed, uniform heating, small core-to-surface temperature difference, and good flexibility; it can achieve heating temperatures above 500℃; and it is convenient and quick to install and operate.

Description

Technical Field

[0001] This utility model relates to the field of electric heating equipment technology, and in particular to a high power density flexible heater. Background Technology

[0002] In nuclear power plants, armored electric heat tracing wires are used to heat boric acid pipelines, sodium solution pipelines, chilled water pipelines, instrument pipelines, and other special process pipelines to maintain fluid temperature and prevent crystallization or freezing of boric acid, sodium solution, and other fluid media. Simultaneously, electric heat tracing wires are also used to some extent in heating high-temperature gas transport pipelines in the desiccant section of electrical boxes. Electric heat tracing wires play a crucial role in maintaining the safe and stable operation of nuclear power units.

[0003] Among existing electric heaters, strip and wire electric heaters mainly include armored heat tracing cables, self-regulating heating cables, and silicone heat tracing cables. While armored heat tracing cables can achieve higher power, their metal material and inherent flexibility make them difficult to install and lay. Self-regulating heating cables and silicone heat tracing cables have plastic or silicone outer shells; although they are flexible, their material properties limit their ability to achieve higher heating temperatures. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a high power density flexible heater.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to provide a high power density flexible heater, including a strip-shaped and bendable heating element and a cable connected to at least one end of the heating element;

[0006] The heating element includes a flexible and high-temperature resistant central support, a heating wire, and a flexible and high-temperature resistant insulating shell; the heating wire is wound in a spiral shape around the outer periphery of the central support to form a spiral heating structure; the insulating shell covers the outer periphery of the heating structure; the cable is electrically connected to the heating wire.

[0007] In one embodiment, the central support comprises a woven strip made of high-temperature resistant fibers.

[0008] In one embodiment, the central support further includes a polytetrafluoroethylene layer coated on the surface of the woven strip.

[0009] In one embodiment, the insulating outer shell is a woven outer jacket made of high-temperature resistant fibers.

[0010] In one embodiment, the surface of the insulating housing is provided with a protective layer.

[0011] In one embodiment, the heating wire is an alloy heating wire.

[0012] In one embodiment, the cable portion includes a cable core and an insulating sheath covering the outer periphery of the cable core; the cable core is electrically connected to the heating structure.

[0013] In one embodiment, the high power density flexible heater further includes a connector that connects between the heating element and the cable portion and electrically connects the heating structure and the cable portion.

[0014] In one embodiment, the connector has a first connecting hole and a second connecting hole at its opposite ends;

[0015] One end of the central support is inserted into the first connecting hole, and the corresponding end of the heating structure abuts against the inner wall of the first connecting hole and is electrically connected.

[0016] The cable core of the cable section is inserted into the second connection hole and is electrically connected to the connector.

[0017] In one embodiment, the end of the heating structure is connected to the connector by resistance welding; the cable core of the cable portion is connected to the connector by riveting and brazing.

[0018] The beneficial effects of this utility model are as follows: a flexible, high-temperature resistant central support is used as the supporting structure, and the heating wire is spirally wound on the central support to form a spiral heating structure. A flexible, high-temperature resistant insulating shell is wrapped around the heating structure to form a flexible heating body with high power density performance. It has the characteristics of fast heating speed, uniform heating, small core-to-surface temperature difference, and good flexibility, and can achieve a heating temperature of over 500℃. Installation and operation are convenient and quick. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a high power density flexible heater according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic cross-sectional view of a high power density flexible heater according to an embodiment of the present invention along the axial direction.

[0022] Figure 3 yes Figure 2 A magnified structural diagram of part A in the middle. Detailed Implementation

[0023] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] like Figures 1-2 As shown, a high power density flexible heater according to an embodiment of the present invention includes a heating element 10 and a cable portion 20 connected to at least one end of the heating element 10. The cable portion 20 is electrically connected to the heating element 10, and the cable portion 20 is used to connect to a power source, while the heating element 10 is used to generate heat when energized.

[0025] The heating element 10 is strip-shaped and flexible, and can be bent so that it can be wound around the workpiece waiting to be heated in the pipe.

[0026] Specifically, the heating element 10 includes a flexible and high-temperature resistant central support 11, a heating wire 12, and a flexible and high-temperature resistant insulating shell 12. The heating wire 12 is wound in a spiral shape around the outer periphery of the central support 11, forming a spiral heating structure; the heating structure also extends along the length direction of the central support 11, and the two are roughly equal in length in the axial direction. The insulating shell 13 covers the outer periphery of the heating structure, serving as the outer layer structure of the heating element 10.

[0027] The heating wire 12 is formed in the heating element 10 in a spiral heating structure. It is not only stretchable and flexible, but also increases the heating area of ​​the heating element 10. It has a larger heating area per unit area, so as to achieve a higher heating temperature and improve the power density of the heating element 10.

[0028] The heating structure can achieve uniform heating and a surface working temperature difference of less than 2℃ by strictly controlling the spiral arrangement spacing of the heating wire 12 during the processing.

[0029] Heating wire 12 is a high-temperature resistant alloy heating wire. Alternatively, the alloy heating wire can be made of metal materials such as nickel-chromium alloy, nickel-iron alloy, or constantan wire.

[0030] The central support 11 serves as the internal support of the heating structure. It is high-temperature resistant and has insulating properties. It can bend synchronously with the heating structure and provides structural support, maintaining the structural stability of the heating structure. The central support 11 comprises woven strips made of high-temperature resistant fibers, which can be, but are not limited to, columnar woven strips. Because the central support 11 is a woven strip, it has a certain degree of elasticity and can be appropriately lengthened or shortened along with the heating structure.

[0031] High-temperature resistant fibers are made of asbestos fiber, glass fiber, metal fiber, boron nitride fiber, ceramic fiber, carbon fiber or graphite fiber, etc. They can ensure strength while also being stable, with high strength and high temperature resistance, and the maximum working temperature exceeds 500℃.

[0032] The central support 11 also includes a polytetrafluoroethylene layer coated on the surface of the braided strip to improve the high temperature resistance of the central support 11.

[0033] The insulating outer shell 13 covers the outside of the heating structure, providing protection and effectively preventing leakage caused by contact between the heating structure and the workpiece during operation. The insulating outer shell 13 is flexible and bends with the heating structure. Made of high-temperature and corrosion-resistant non-metallic materials, the insulating outer shell 13 effectively solves the problems of low flexibility, difficulty in bending and shaping, and inconvenient installation associated with metal outer shells.

[0034] Preferably, the insulating outer shell 13 is a woven outer jacket made of high-temperature resistant fibers. The high-temperature resistant fibers may include asbestos fibers, glass fibers, metal fibers, boron nitride fibers, ceramic fibers, carbon fibers, or graphite fibers. The insulating outer shell 13 can be woven from the same high-temperature resistant fibers as the central support 11, or it can be woven from different high-temperature resistant fibers.

[0035] The surface of the insulating outer shell 13 is provided with a protective layer. The protective layer is formed by silicone oil, epoxy coating or polytetrafluoroethylene coating, etc.

[0036] The cable section 20 serves as the electrical terminal of the high-power-density flexible heater, and is disposed at at least one end of the heating element 10 and electrically connected to the heating element 10. Specifically, the cable section 20 may include a cable core 21 and an insulating sheath 22 covering the outer periphery of the cable core 21; the cable core 21 is electrically connected to the heating structure of the heating element 10.

[0037] Furthermore, the high power density flexible heater also includes a connector 30, which serves as an intermediate transition member, connecting the heating element 10 and the cable section 20 and electrically connecting the heating structure and the cable section 20. Specifically, the connector 30 is not only mechanically connected between the heating element 10 and the cable section 20, but also electrically connected between the heating structure and the cable core 21 of the cable section 20.

[0038] To accommodate the stretching of the heating structure during use, the heating element 20 is mainly connected to the heating structure via the central support 11 and the connector 30. That is, in the heating element 10, the insulating shell 13 does not completely cover the heating structure; the end of the central support 11 and the corresponding end of the heating structure (which is also the end of the heating wire 12) extend out of the insulating shell 13 to connect with the connector 30.

[0039] In one implementation, such as Figure 2 and Figure 3 As shown, the connector 30 has a first connecting hole 31 and a second connecting hole 32 at its opposite ends. One end of the central support 11 is inserted into the first connecting hole 31, and the end of the corresponding heating structure (which is also the end of the heating wire 12) abuts against the inner wall of the first connecting hole 31 and is electrically connected; the cable core 21 of the cable part 20 is inserted into the second connecting hole 32 and is electrically connected to the connector 30.

[0040] To improve connection stability, the end of the heating structure is connected to the connector 30 by resistance welding; the cable core 21 of the cable section 20 is connected to the connector 30 by riveting and brazing. These connection methods allow the connection to withstand high temperatures and adapt to high-vibration environments, ensuring that the connector 30 does not detach.

[0041] The connector 30 is made of a conductive metal material, which may be, but is not limited to, stainless steel, aluminum alloy tubing, brass, copper, or copper alloy. The connector 30 may be a joint with a central channel, with a first connecting hole 31 and a second connecting hole 32 formed at opposite ends of the central channel, respectively. The connector 30 may be a cylindrical structure of equal diameter or a cylindrical structure of unequal diameter, which can be flexibly set according to appearance requirements.

[0042] exist Figure 1 In the embodiment shown, the high power density flexible heater includes two cable sections 20, which are respectively connected to the opposite ends of the heating element 10 via connectors 30.

[0043] In use, the heating element 10 is wrapped around the workpiece to be heated, and the two cable sections 20 are connected to the external power supply corresponding to the positive and negative poles respectively. After the heating element 10 is powered on, it heats up and heats the workpiece to be heated.

[0044] In the heating element 10, the heating structure formed by the heating wire 12 has the same power per meter. During on-site installation, the length and power of the heating structure can be adjusted according to actual needs. There is no need to prefabricate in the factory, making the installation flexible and highly operable.

[0045] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high power density flexible heater, characterized in that, It includes a strip-shaped and flexible heating element and a cable portion connected to at least one end of the heating element; The heating element includes a flexible and high-temperature resistant central support, a heating wire, and a flexible and high-temperature resistant insulating shell; the heating wire is wound in a spiral shape around the outer periphery of the central support to form a spiral heating structure; the insulating shell covers the outer periphery of the heating structure; the cable is electrically connected to the heating wire.

2. The high power density flexible heater according to claim 1, characterized in that, The central support consists of woven strips made of high-temperature resistant fibers.

3. The high power density flexible heater according to claim 2, characterized in that, The central support also includes a polytetrafluoroethylene layer coated on the surface of the braided strip.

4. The high power density flexible heater according to claim 1, characterized in that, The insulating outer shell is a woven outer shell made of high-temperature resistant fibers.

5. The high power density flexible heater according to claim 1, characterized in that, The surface of the insulating shell is provided with a protective layer.

6. The high power density flexible heater according to claim 1, characterized in that, The heating wire is an alloy heating wire.

7. The high power density flexible heater according to claim 1, characterized in that, The cable section includes a cable core and an insulating sheath covering the outer periphery of the cable core; the cable core is electrically connected to the heating structure.

8. The high power density flexible heater according to any one of claims 1-7, characterized in that, The high power density flexible heater also includes a connector that connects between the heating element and the cable section and electrically connects the heating structure and the cable section.

9. The high power density flexible heater according to claim 8, characterized in that, The connector is provided with a first connecting hole and a second connecting hole at its opposite ends; One end of the central support is inserted into the first connecting hole, and the corresponding end of the heating structure abuts against the inner wall of the first connecting hole and is electrically connected. The cable core of the cable section is inserted into the second connection hole and is electrically connected to the connector.

10. The high power density flexible heater according to claim 9, characterized in that, The end of the heating structure is connected to the connector by resistance welding; the cable core of the cable section is connected to the connector by riveting and brazing.

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