RU200614U1 - HEATING CABLE - Google Patents

Abstract

The claimed technical solution is intended for warming up and maintaining a given temperature of pipelines, tanks and technological equipment in hazardous areas. It can be used at hazardous production facilities under conditions of high temperatures, mechanical, climatic and other aggressive influences. The claimed technical solution can be applied in the nuclear, oil refining, chemical, pharmaceutical and other industries. The heating cable contains a heating conductor, fiberglass electrical insulation. The cable contains an outer metal sheath over the insulation. EFFECT: increased efficiency of using the claimed cable in aggressive and explosive operating conditions. 8 p.p. f-ly, 3 dwg

Description

Technology area

The claimed technical solution is intended for warming up and maintaining the specified temperature of pipelines, tanks and process equipment in hazardous areas. It can be used at hazardous production facilities under conditions of high temperatures, mechanical, climatic and other aggressive influences. The claimed technical solution can be applied in the nuclear, oil refining, chemical, pharmaceutical and other industries.

State of the art

A variety of heating cables are known in the art.

Known is a heating cable containing a heating core and fiberglass insulation (see WO 2005041214 A1, 06.05.2005). Selected as a prototype.

The disadvantage of the known cable is insufficient efficiency when used in conditions of high temperatures and aggressive environments, as well as low mechanical strength.

Disclosure of essence

The objective of the claimed technical solution is to create a cable with high performance properties.

The technical result achieved when using the claimed technical solution is an increase in the efficiency of using the claimed cable in aggressive and explosive conditions.

The claimed technical result is achieved through the use of the following set of essential features: a heating cable containing a heating core, electrical fiberglass insulation, according to the claimed technical solution, the cable contains an outer metal sheath placed on the insulation.

In special cases of execution of the technical solution, silica glass threads can be used as fiberglass. An additional protective jacket or braid can be placed between the fiberglass insulation and the outer metal jacket. The protective braid can be made of steel threads. The heating core can be made of resistance alloys. The metal sheath can be corrugated or smooth. The metal shell can be made of stainless steel or copper.

Graphic materials explaining the essence

Graphic materials are presented that explain the essence of the claimed technical solution, where:

FIG. 1 - shows a heating cable in the version with a smooth outer metal sheath;

FIG. 2 - shows a heating cable in the version with a corrugated outer metal sheath;

FIG. 3 - shows a heating cable in the version with an additional protective braid.

The designations in all drawings are identical.

Implementation of the technical solution

An increase in the efficiency of using the declared heating cable in aggressive and explosive operating conditions is achieved due to the resistance of the cable to extreme high temperatures, a combination of increased flexibility while maintaining high mechanical strength, fire resistance, non-hygroscopicity, durability and inertness to corrosive and chemical environments. The listed technical effects are achieved through the use of fiberglass insulation in combination with an outer metal sheath.

The heating source is the heating conductor 1. To ensure the desired degree of heating, the heating conductor is made of resistance alloys.

The use of fiberglass insulation 2 ensures the use of the declared heating cable under conditions of increased temperature loads while maintaining the required electrical resistance of the insulation (as opposed to heating cables with mineral insulation). Silica glass threads can be used as fiberglass.

When putting into production, the problem of removing the lubricant from the composition of fiberglass insulation 2 was solved while ensuring the required insulation resistance and mechanical strength of the insulation.

The use of an outer metal sheath 3 provides tightness, increased mechanical strength and flexibility of the heating cable, corrosion and chemical resistance. The outer metal sheath 3 can be corrugated, smooth or corrugated, depending on the required characteristics of flexibility and strength of the heating cable. The metal sheath 3 can be made of stainless steel or copper, or another metal that provides the specified mechanical characteristics of the heating cable.

To increase the durability of the heating cable and reduce chafing of the insulation 2 by the outer metal sheath 3, especially corrugated ones, an additional protective sheath or braid 4 can be placed between the fiberglass insulation 2 and the outer metal sheath 3. In this case, the protective braid 4 can be made of steel threads, and a protective shell made of textile material.

The heat resistance of the declared heating cable is provided up to 800 ° C (maximum operating temperature). The resistance of the heating core can reach 11000 Ohm / km (at 20 ° C). The minimum operating temperature of the declared cable is -70 ° C.

Examples of execution of the declared heating cable

Heating cable with a core, cross-section 2.5 mm ² , resistance 11000 Ohm / km at 20 ° C with a maximum supply voltage of 670 V, a maximum linear power of 300 W / m, has fiberglass insulation from silica filaments and a smooth metal sheath.

Claims (9)

1. A heating cable containing a heating conductor, electrical fiberglass insulation, characterized in that the cable contains an outer metal sheath placed on the insulation. 2. A cable according to claim 1, characterized in that silica glass threads are used as glass fibers. 3. Cable according to claim 1, characterized in that an additional protective sheath or braid is placed between the fiberglass insulation and the outer metal sheath. 4. A cable according to claim 3, characterized in that the protective braid is made of steel threads. 5. Cable according to claim 1, characterized in that the heating core is made of resistance alloys. 6. Cable according to claim 1, characterized in that the metal sheath is corrugated. 7. Cable according to claim 1, characterized in that the metal sheath is smooth. 8. Cable according to claim 1, characterized in that the metal sheath is made of stainless steel. 9. Cable according to claim 1, characterized in that the metal sheath is made of copper.

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