RU2066U1 - FLEXIBLE HEATING ELECTRICAL CABLE - Google Patents

Abstract

1. FLEXIBLE HEATING ELECTRICAL CABLE, including resistive and insulating sheath, characterized in that it additionally contains a current lead connected in separate sections of the resistor parallel to the last and having an equivalent resistance not less than 10 times less than the resistance of the corresponding section of the resistor. 2. The cable according to claim 1, characterized in that the current lead is formed by at least one conductor and is placed on the resistive sections in the form of a braid or wrapping. PP cable 1 and 2, characterized in that it contains carbon fiber as a resistor. 4. A cable according to claims 1 to 3, characterized in that the current lead is connected to the resistor by soldering or welding or by electrically conductive adhesive. 5. The cable according to claim 1, characterized in that the current lead is made in the form of an electrically conductive layer, for example, electroplating on the surface of the resistive.

Description

FLEXIBLE HEATING ZLSHISH CABLE.

The proposed utility model relates to devices used in electrical engineering, and more specifically, to heating elements operating in the temperature range up to 1200 ° C and can be used to complete the heating of devices and production and technological equipment.

At present, a sufficient number of flexible heating elements in the form of a cable is known, the basis of which is sz sggnk / rassdelivyayuschiy / conductor, fixed on a flexible base and closed. E elegtroizolyatschchzlyuyu, j then: t including a hermetic shell-dyaleryak / 1 /. for supplying edg agchssyugs current to t: st: the zgo element is usually strong., t cold part / current lead ..: /. 3 ter case T01: olod /: d lr: p; rzlla t zstyk .. .. .ex: to :: cheskk / Ј /, ha: lol, szar ... i-i .r / J / 5Д,

The above analogs are quite convenient for operation, however, they have a common drawback - the connection nodes of cold and hot parts are the most vulnerable place for heating devices. The need for electrical insulation and often sealing significantly complicates their manufacturing technology, increases the complexity and cost of the heater, and also reduces operational reliability , leading to the failure of the heaters primarily due to the destruction of the junction of the cable with the current lead or its depressurization.

The closest in technical essence and the achieved result is a heating electric cable / 5 /, having at least one electric heater in the form of a heat-generating wire in a sheath, on the inner side of which adjacent to the wire there is an electric

waterproofing material. To increase the terrain, at least one armor wire is placed inside the sheath. The prototype cable is able to withstand continuous, alternating loads, however, as in the case of analogs, the connection of the prototype cable to the current lead when used as a heating element is only possible in a traditional way, by ensuring their electrical contact end-to-end due to the lack of current supply in the cable structure itself. The need to make a node connecting the cable to the current lead to increase the complexity of gotovleniya heating element based on the cable and reduce its reliability.

The objective of the solution is to create a flexible heating electric cable containing alternating heat-generating and cold / not generating heat / sections, eliminating the need for a node connecting the cable to the current supply. This eliminates the disadvantages inherent in well-known analogues and prototype.

H05 3 3 / 56.3 / 0 &

The essence of the solution lies in the fact that in a heating cable containing a resistive conductor with high ohmic resistance and an insulating sheath, in separate sections of the resistor, a current lead-at least / one conductor is connected in parallel with it, the equivalent resistance of which is not less than 10 times less than the resistance of the corresponding section of the resistive. Such shunting of resistive sections with a current lead-conductor-rm allows obtaining alternating heat-generating and cold sections along the resistor length, which, when the cable is cut through them, serve as ready-made current leads for switching on a heating element in the network or additionally provide cable manufacturing with necessary cold sections built in in length.

The proposed electric cable is made, for example, by wrapping or braiding sections of a resistive conductor with a current lead. It is easy to choose the length of the heat-generating section. Based on the required specific or total power of the heating element. Next, the finished resistor with the current lead placed on cold sections is placed in an insulating shell / polymer, fiberglass, etc. /. If necessary, the cable is equipped with an earth screen, decorative and other shells. In addition to these methods, current supply is possible to be resisted with soldering or electrically conductive glue. Moreover, when applying, for example, by spraying or deposition of an electrically conductive coating with equivalent resistance, satisfying the above requirement as a current lead, a bypass effect is also achieved on the resistive sections.

The requirement to use a current lead with an equivalent resistance of at least 10 times less than the resistance of the resistor provides optimal shunt conditions: for a value of less than 10, the resistance of the cable section is close enough to the equivalent resistance of the current lead and this allows electric current to pass through both conductors simultaneously, which in some cases, provided that heating cables with high specific power are used, leads to heat generation in the cold section of the cable above allowable safe icons

Schematically, the proposed device is shown in Fig. 1; section A-A-Fig. 2; section B-B- $ ig.Z, Fig. 4 shows an example of a heating cable arrangement with alternating hot and cold sections, where I is resistive / alloy high ohmic resistance, carbon fiber /; 2-insulating layer / fiberglass, polymer /; 3-insulating shell / fiberglass, polymer /; 4-screen embedment / metal braid, polymer /; 5-current lead / braid /; 6-hot cable section; 7-cold cable section; 8-pin cable ends.

the current supply, as required by the prototype, allows to increase the waterproofing of the heating element and its reliability while maintaining high power and unchanged cable dimensions.

The cable passed laboratory and field tests with a positive result and is currently being operated as a heating element of the defrosting system of the evaporator of the refrigeration machine and in the snow melting system of the monument to the Defenders of Leningrad11 in St. Petersburg.

In Tab. The operational characteristics of a flexible electric cable are given, which allow us to conclude that the proposed utility model is industrially applicable.

At present, AOZT Polytherm manufactures the proposed cable for delivery on orders. In 1994, it is planned to expand production to 60 thousand meters per year.

- ЈMOj & tf

- Ј Talari you;

elementsj Smallness

heating | cable, kw cable, im |

4Heating {element of a holodilny car: And an okopodvod-copper

Irradiated conductor

gresisyuyv-carbohydrate; locally brands URAL

Snow soldering system heating element: current lead-nickel

10 pieces. Nresistive Alloy

y / uftW

Tab.

Heating temperature 0 cable sections, C

0.170

20

150

20

3.0 260

- t References:

/ I / C. UK No. 22E4I89, H05 B 3/56

/ g / a.s. 17772893 CCCP, HG5 B 3/56

/ 3 / з.РСТ No. 90/09086, Н05 В 3/36

/ 4/3. Japan No. 63-19994, H05 B 3/20

# 5 / Z. France No. H05 B 3/56 prototype

gioizwf

General deer

AOZT Polite G G4 & A.A Bolotin

- 1 1 b.

 VTOU, .1 / s

Claims (5)

1. FLEXIBLE HEATING ELECTRICAL CABLE, including resistive and insulating sheath, characterized in that it additionally contains a current lead connected in separate sections of the resistor parallel to the last and having an equivalent resistance not less than 10 times less than the resistance of the corresponding section of the resistive.  2. The cable according to claim 1, characterized in that the current supply is formed by at least one conductor and placed on the sections of the resistive in the form of a braid or wrapping.  3. The cable according to paragraphs. 1 and 2, characterized in that as a resistive it contains carbon fiber.  4. The cable according to claims 1 to 3, characterized in that the current lead is connected to the resistor by soldering or welding or by electrically conductive adhesive.  5. The cable according to claim 1, characterized in that the current supply is made in the form of an electrically conductive layer, for example, electroplating on the surface of the resistive.