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Electric heating cable capable of eliminating solid linear thermal expansion coefficient influence

A linear thermal expansion coefficient, electric heating cable technology, applied in the direction of heating element shape, heating element material, etc., can solve the problems of open circuit fault of heating conductor, no shaft core, difficult to determine the location of the fault, etc., to reduce frictional resistance, The effect of increasing the heat dissipation area and eliminating the influence

Inactive Publication Date: 2014-03-05
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

② At the 180-degree turn, a short circuit fault occurs between the heating conductor and the shielding layer conductor, or an open circuit fault occurs in the heating conductor, and the location of the fault is difficult to determine
In addition, the cement and concrete layers of the floor and leveli

Method used

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  • Electric heating cable capable of eliminating solid linear thermal expansion coefficient influence
  • Electric heating cable capable of eliminating solid linear thermal expansion coefficient influence
  • Electric heating cable capable of eliminating solid linear thermal expansion coefficient influence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1, Axial strand 28

[0049] The axis of the electric heating cable 5 is an axial strand 28, and the axial strand 28 is a solid strand made of polytetrafluoroethylene material and is located at the central axis of the electric heating cable 5. The establishment of the axial strand 28 increases the radius R of each turn of the heating conductor 23, which can reduce the ratio of ΔR / R, and the axial contraction or extension of the heating conductor 23 is converted into a radial contraction or extension. Therefore, the influence of the linear thermal expansion coefficient on the axial shrinkage or elongation of the electric heating cable 5 is eliminated.

Embodiment 2

[0050] Embodiment 2. Heating conductor 23, isolation strand 29 and protective sleeve 22

[0051] The outer side of the axial strand 28 is composed of three strands of heating conductor 23 and three strands of spacer strand 29. The isolation strand 29 is made of a hollow polytetrafluoroethylene tube, and the function of the isolation strand 29 made of a hollow tube is to provide space for the shrinkage or extension of the heating conductor 23. The isolation strand 29 can isolate the three heating conductors 23 from each other, thereby enhancing the heat dissipation area of ​​the heating conductor 23.

[0052] In the process of twisting the three heating conductors 23 and the three isolation strands 29, apply a layer of silicone oil, which can drag a layer of talcum powder 24 on the surface of the heating conductor 23 and the three isolation strands 29, which can reduce the heating conductor 23 The friction resistance of contraction or elongation, and the tetrafluoroethylene film 26...

Embodiment 3

[0054] Embodiment 3. Electromagnetic wave shielding layer 21, mica tape 25 and outer protective cover 20

[0055] On the outer side of the inner protective sleeve 22, there is a woven metal electromagnetic wave shielding layer 21. The surface of the electromagnetic wave shielding layer 21 is coated with a layer of silicone oil, which can drag a layer of talc powder 24 on the inner and outer surfaces. The talc powder 24 can reduce the frictional resistance of the shrinkage or elongation of the electromagnetic wave shielding layer 21. The talc powder 24 can make the woven electromagnetic wave shielding layer 21 The increase in the radius of each turn ΔR is uniformly distributed. A mica tape 25 is wound on the electromagnetic wave shielding layer 21. The mica tape 25 is wound with a thickness of more than 3μm (preferably less than 8μm), which can prevent the shrinkage or elongation of the electromagnetic wave shielding layer 21 from piercing the outer protective sheath of the electr...

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PUM

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Abstract

The invention discloses an electric heating cable capable of eliminating solid linear thermal expansion coefficient influence, and belongs to the technical field of electric heating. The electric heating cable capable of eliminating the solid linear thermal expansion coefficient influence structurally comprises heating conductors (23), isolation strands (29) and an axis strand (28) from inside to outside, wherein the isolation strands (29) are of a polytetrafluoroethylene tube shape, the three heating conductors (23) and the isolation strands (29) are arranged in an alternate intertwist mode, the axis strand (28) is arranged among the heating conductors (23), tetrafluoroethylene film (26), an inner protective cover (22), an electromagnetic wave shielding layer (21), a mica tape (25) and an outer protective cover (20) are wound on the heating conductors (23) and the isolation strands (29) in sequence, and talcum powder (24) is arranged on the inner side and the outer side of the electromagnetic wave shielding layer (21) and the interior of the tetrafluoroethylene film (26) respectively in a towing mode. According to the electric heating cable capable of eliminating the solid linear thermal expansion coefficient influence, design is carried out in multiple aspects, the problem that influence is caused by linear thermal expansion of an electric heating cable is solved, the number of faults caused by linear thermal expansion is reduced, and the novel electric heating cable which is long in service life and small in number of faults is formed.

Description

Technical field [0001] The invention belongs to the technical field of electric heating, and particularly relates to an electric heating cable that can eliminate the influence of the thermal expansion coefficient of a solid wire. Background technique: [0002] Electric geothermal heating has the advantages of no air pollution, no noise, room temperature can be automatically controlled, and no water pipe burst and leakage problems. [0003] However, the installation structure of electric geothermal heating engineering, such as figure 1 The electric geothermal installation is shown in the section view. Pre-embed the steel bar 1 in the base layer 2, pave a layer of polystyrene board 3 on the base layer 2, pave a layer of polyester aluminized film 4 on the polystyrene board 3, install electric heating cables on the polyester aluminized film 4 5. Cover the upper and both sides of the electric heating cable 5 with concrete 6 for solidification and fixation. The concrete 6 is covered wit...

Claims

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Application Information

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IPC IPC(8): H05B3/56H05B3/10
Inventor 裴力苏峰侯志鹏王文全
Owner JILIN UNIV