CN1110862A - PTC flexible metal heating cable - Google Patents
PTC flexible metal heating cable Download PDFInfo
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- CN1110862A CN1110862A CN 95101721 CN95101721A CN1110862A CN 1110862 A CN1110862 A CN 1110862A CN 95101721 CN95101721 CN 95101721 CN 95101721 A CN95101721 A CN 95101721A CN 1110862 A CN1110862 A CN 1110862A
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- ptc
- flexible metal
- heating cable
- metal heating
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Abstract
The PTC flexible metal heating cable used in petroleum and chemical industries for tracing heating and heating of pipeline and equipment features better flexibility, automatic regulation of generated heat, corrosion resistance, and long service life.
Description
The present invention relates to the metal heating cable of equipment elevated temperature heat compensation such as a kind of industrial pipeline, container (high temperature companion heat) or heating.
The existing heating cable that is used for equipment companion heat such as pipeline, container is mainly made by transmission pressure, heater element and insulating barrier, and its insulating layer material is macromolecule insulating material such as fluoroplastics, silicon rubber.Because the temperature resistant grade of these insulating polymeric materials has only more than 200 degree centigrade at the most, and wearing out appears in the long-term work meeting, price reduction, closes so can not be used for high temperature companion thermal field.For example: on May 11st, 1988, disclosed Britain patent of invention GB2197170A proposed the heating element that a kind of pipeline, container are used, but this technical scheme can only be used for temperature resistant grade in the use occasion below 260 ℃, and range of application is restricted.
The purpose of this invention is to provide a kind of high temperature companion heat of pipeline, container or metal heating cable of heating of being used for, it can not only normally use in 850 ℃ and following environment, and heating power can be according to the change direction of ambient temperature significantly to constant temperature point adjusting automatically.
The object of the present invention is achieved like this: one or more (being no more than 19) alloy PTC resistive heater (1) axially extends in parallel distribution at overall length along it in metallic sheath (3) volume inside.The position of each root alloy PTC heating wire is to determine like this: on the cross section of metallic sheath (3), alloy PTC heating wire minimum range is each other equated, make again near the alloy PTC heating wire (1) of metallic sheath (3) to equate with minimum range between the metallic sheath (3).Between the alloy PTC heating wire (1) and with metallic sheath (3) between the space in closely fill inorganic high-temp insulation powder (2), with guarantee to reach between the alloy PTC heating wire (1) and metallic sheath (3) between enough electric insulation intensity is arranged.As required, between each root alloy PTC resistance heating core (1) both can head end or (with) tail end adopts " serial connection ", " and connecing ", " Y shape connects " or " △ shape connects ", also can adopt the combination in any of above-mentioned four kinds of connections, formed the galvanic circle of alloy PTC resistance heating core (1), when head end connect single-phase or (with) can come into operation behind the three phase mains.
1. above-mentioned alloy PTC resistance heating core (1) is to be made by PTC electrothermal alloy material (as nimonic, dilval, nickel chromium triangle cobalt silicon alloy etc.), and fusing point is all more than 1200 ℃, can be in long-term work under 850 ℃ and the following working temperature.Its electricalresistivity (Ω .mm
2/ m) should satisfy with the amassing of temperature coefficient of resistance α (1/ ℃): α * β＞3.7 * 10
-4(Ω .mm
2/ m ℃), this just makes the PTC flexible metal heating cable have the obvious PTC temperature regulation characteristic, its heating power can be regulated to constant temperature point significantly automatically against the change direction of ambient temperature.
2. above-mentioned metallic sheath (3) is to be made by materials such as acid bronze alloy, stainless steel or heat resisting steel, fusing point is all more than 1000 ℃, as required can long-term work under 300～850 ℃ of environmental conditions, select different materials can play corrosion-resistant, reduce effect such as thickness, guaranteed the pliability of PTC flexible metal heating cable.
3. above-mentioned inorganic high-temp insulation powder (2) is materials such as crystal magnesium oxide powder, silicon carbide powder, and these materials all can long-term work under 850 ℃ of temperature.
PTC flexible metal heating cable existing 850 ℃ and following temperature resistant grade by such scheme is made have the obvious PTC temperature adjusting performance again, and have pliability, noninflammability, and characteristics such as corrosion-resistant and long-life have reached purpose of the present invention.
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the structure with alloy PTC resistance heating core (1).
Fig. 2 is the circuit diagram of Fig. 1.
Fig. 3 is the structure with two alloy PTC resistance heating cores (1).
Fig. 4 is the circuit diagram of Fig. 3.
Fig. 5 is the structure with three alloy PTC resistance heating cores (1).
Fig. 6 is the circuit diagram of Fig. 5.
Fig. 1, two kinds of PTC flexible metal heating cables that adopt the single phase poaer supply power supply shown in Figure 3.The diameter of alloy PTC resistance heating core (1) is respectively 0.56mm and 0.69mm, and its composition is a nickel chromium triangle cobalt silicon alloy, and resistivity is 0.75 Ω .mm
2/ m, temperature coefficient of resistance is 5 * 10
-4/ ℃.Metallic sheath (3) adopts electrician's soft copper, and thickness is 0.6mm.Inorganic high-temp insulation powder (2) adopts the crystal magnesium oxide powder, and its minimum range between alloy PTC resistance heating core (1) and metallic sheath (3) is 1.3mm.Fail with operating voltage U(referring to Fig. 2 at two ends in structure shown in Figure 1); Two alloy PTC resistance heating cores (1) of the tail end of structure shown in Figure 3 are coupled together, defeated at its head end with the single-phase operating voltage of 220V (referring to Fig. 4), then they have formed the PTC flexible metal heating cable of two kinds of single phase power supplies, they can be 350 ℃ and the following medium-term and long-term work of environment, certain PTC temperature adjusting performance is arranged, minimum bending radius is respectively 35mm and 40mm, and has noninflammability.
A kind of PTC flexible metal heating cable that adopts three phase supply shown in Figure 5.The diameter of alloy PTC resistance heating core (1) is 0.69mm, and its composition is a nimonic, and resistivity is 0.1 Ω .mm
2/ m, temperature coefficient of resistance is 5.5 * 10
-3/ ℃.Metallic sheath (3) adopts 1Cr18Ni9Ti, and thickness is 0.7mm.Inorganic high-temp insulation powder (2) adopts the crystal magnesium oxide powder, and its minimum range between alloy PTC resistance heating core (1) and metallic sheath (3) is 1.3mm.Three alloy PTC resistance heating cores of structure tail end shown in Figure 5 are coupled together, defeated at its head end with 380V three-phase operating voltage (referring to Fig. 5), then formed the PTC flexible metal heating cable of a three phase supply, it can have the obvious PTC temperature adjusting performance 850 ℃ and the following medium-term and long-term work of environment.Minimum bending radius is 60mm, and has noninflammability.
Claims (9)
1, a kind of PTC flexible metal heating cable, form by alloy PTC resistance heating core (1), inorganic high-temp insulation powder (2) and metallic sheath (3), it is characterized in that (1), (2), (3) form at metal more than 1000 ℃ or inorganic insulating material by fusing point, and have noninflammability.
2, according to the said PTC flexible metal heating cable of claim 1, it is characterized in that having pliability.
3,, it is characterized in that heating power can regulate to constant temperature point significantly automatically according to the variation of ambient temperature according to the said PTC flexible metal heating cable of claim 1.
4,, it is characterized in that electricalresistivity (the Ω .mm of alloy PTC resistance heating core (1) according to the said PTC flexible metal heating cable of claim 1
2/ m) product with its temperature coefficient of resistance α (1/ ℃) should satisfy: α * β＞3.7 * 10
-4Ω .mm
2/ m ℃.
5, according to the said PTC flexible metal heating cable of claim 1, the pattern that it is characterized in that powering adopt single-phase or (with) three phase supply.
6, according to the said PTC flexible metal heating cable of claim 1, it is characterized in that the wiring pattern between each root alloy PTC resistance heating core (1) is " serial connection ", " and connecing ", " Y shape connects ", " △ shape connects ", or the combination in any of above-mentioned four kinds of connections.
7, according to the said PTC flexible metal heating cable of claim 1, it is characterized in that cross-sectional shape is garden shape, rectangle, square, ellipse garden shape and triangle, or the combination in any of above-mentioned five kinds of shapes and amalgamation.
8,, it is characterized in that the radical of alloy PTC resistance heating core (1) is no more than 19 according to the said PTC flexible metal heating cable of claim 1.
9, according to the said PTC flexible metal heating cable of claim 1, it is characterized in that between the alloy PTC heating core (1) minimum range and with metallic sheath (3) between minimum range equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95101721 CN1110862A (en) | 1995-02-07 | 1995-02-07 | PTC flexible metal heating cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95101721 CN1110862A (en) | 1995-02-07 | 1995-02-07 | PTC flexible metal heating cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1110862A true CN1110862A (en) | 1995-10-25 |
Family
ID=5074059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95101721 Pending CN1110862A (en) | 1995-02-07 | 1995-02-07 | PTC flexible metal heating cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1110862A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056263C (en) * | 1995-12-17 | 2000-09-06 | 赵放 | Alloy PTC parallel type electric heating strip |
| CN101534584B (en) * | 2009-04-10 | 2010-10-13 | 广西贵港市群星电缆有限公司 | Heat bearing cable |
| CN102465690A (en) * | 2010-11-05 | 2012-05-23 | 于光 | Three-phase super-long high-power heating pipe for oil well |
| CN102467993A (en) * | 2010-11-05 | 2012-05-23 | 于光 | Overlong power cable for three-phase magnesium oxide metal sheath |
| CN102465689A (en) * | 2010-11-05 | 2012-05-23 | 于光 | Oil field ultra-long sealed three-phase high-power heating device |
| CN109663256A (en) * | 2019-02-18 | 2019-04-23 | 中国铁路沈阳局集团有限公司科学技术研究所 | A kind of railway fire line cold-proof electric heater |
-
1995
- 1995-02-07 CN CN 95101721 patent/CN1110862A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056263C (en) * | 1995-12-17 | 2000-09-06 | 赵放 | Alloy PTC parallel type electric heating strip |
| CN101534584B (en) * | 2009-04-10 | 2010-10-13 | 广西贵港市群星电缆有限公司 | Heat bearing cable |
| CN102465690A (en) * | 2010-11-05 | 2012-05-23 | 于光 | Three-phase super-long high-power heating pipe for oil well |
| CN102467993A (en) * | 2010-11-05 | 2012-05-23 | 于光 | Overlong power cable for three-phase magnesium oxide metal sheath |
| CN102465689A (en) * | 2010-11-05 | 2012-05-23 | 于光 | Oil field ultra-long sealed three-phase high-power heating device |
| CN109663256A (en) * | 2019-02-18 | 2019-04-23 | 中国铁路沈阳局集团有限公司科学技术研究所 | A kind of railway fire line cold-proof electric heater |
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| C10 | Entry into substantive examination | ||
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |