RU2543966C2 - Flexible heating element - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: flexible heating element includes resistive wire bundle in the form of a bundle of enamelled resistive micro wire and reinforcing threads, the bundle bound by a thread with 0.5-1 cm pitch.

EFFECT: stable electric resistance and heating efficiency.

3 dwg

Description

The invention relates to the field of resistive heating and can be used to heat the surfaces of the seat, human clothing, etc.

Known flexible electric heater of the Russian Federation No. 95113634, where graphite fabric made of viscose threads was used as a resistive module, and a braid in the form of a hollow cord was used as the material of flexible electrodes. The resistance of the braid to alternating loads is low, there is the possibility of oxidation of tissue contacts with electrodes due to leakage of the connection. The thickness of the electric heater is more than 2 mm. High cost, low tech.

From the patent of the Russian Federation No. 76536 a heating wire is known in the form of a coil of six resistive wires around a reinforcing bundle of polymer thread. The heating wires are equipped with solid PTFE insulation. Resistive wires are made with a diameter of 0.13-0.14 mm, the heating wires are connected by metal contacts to the current-carrying wire. The woven base of one or two layers is impregnated with a flame retardant and provided with a means of fixation to the car seat. The described heating wire has an increased length per unit of heating power, its circular cross section is felt under the seat upholstery. High price.

The technical task of the invention is to improve performance, simplify the assembly technology of the heating element and get a more flat shape while maintaining the heating efficiency per unit of the heated surface.

Claimed

A flexible heating element comprising a bundle of resistive wires, characterized in that it is made in the form of a bundle of enameled microwire with a diameter of 0.03-0.07 mm with reinforcing threads of heat-resistant material and strapping the beam with a thread of heat-resistant material, for example Arselon, in increments of 0 5-1 cm.

In FIG. 1 shows a flexible heating element; FIG. 2 is a sectional view of an element when flashing to a heating surface; FIG. 3 is an example of a heating surface with an attached heating element.

The flexible heating element 1 consists of a bundle of enameled microwire 2 together with reinforcing threads 3 from Arselon to increase tensile strength and winding threads 4.

A PETD microwire (TU 16-705.264-82) with a diameter of 0.06 mm (maximum heating temperature 180 degrees) of 14 threads and 2 Arselon threads (manufactured by Svetlogorsk Khimvolokno OJSC (maximum heating temperature 250 degrees) with a density of 29 , 4 tex. Their number is calculated based on the heating power, heating temperature, thermal conductivity of the materials used.

The bundle of threads is grouped by wrapping them with one thread 4 with a winding pitch of approximately 0.5-1 cm. For winding, an Arcelon thread with a linear density of 29.4 tex was used. The winding was made on standard equipment designed for winding cables.

The manufacture of a flexible heating element from a bundle of threads ensures the stability of electrical resistance along the entire length and the guaranteed functioning of the heating resistive element. The winding thread forms a heating element of a given rating in the absence of special requirements for strength and electrical insulation and at the same time does not prevent complete heat transfer to a flexible heating surface

At a winding pitch of approximately 0.5 cm per bundle of threads, the necessary strength, density and uniformity of the flexible heating element along its length is provided, and there is also some elasticity of the element in the transverse direction. When such a heating element is flashed to the heat-conducting electrical insulating base 5 of the heating surface or during operation, the beam cross section changes from round to flat (as shown in Fig. 2) 1 mm thick, which is practically not felt on the seats, but the reliability and heating efficiency, as well as ease of manufacture retain high performance, as in the prototype. A winding pitch within 1 cm is preferable, since with a larger pitch, the heating element may be stratified during installation and fastening.

An example of manufacturing a heating flexible surface for a car seat using the inventive heating element is illustrated in figure 3.

Option 1: On the basis of the heater (self-adhesive PROLIN, TU 2254-013-48214265-2002), the heating element is glued according to the specified marking according to the stated solution, and the heater is mounted on the seat base or car upholstery.

Option 2: On the basis of the heater (needle-punched non-woven fabric PN20 according to TU 8397-009-25388761-2002 with a thickness of 2 mm), the heating element is sewn according to the specified marking on a Zig-Zag sewing machine with a seam width of 7-12 mm.

Both open ends of the bundle of threads are electrically connected by soldering with a current lead 6.

The heater area is 30 × 40 cm, the heating temperature is 35 ° C, the power supply from the DC source is 13.5 V. The heating power was 60 W, the heating current was 4.4 A.

A flexible heating element from a microwire bundle can be made with different specific heating powers per unit length.

The advantages of a bundle consisting of a bundle of threads is that the bundle of a microwire consists of separate wires insulated from one another and, when one of the wires is destroyed, does not cause arcing and burn-through, since a small current flows through the wire. The heat transfer of the tow is high, due to the absence of an insulating layer (fluoroplastic shell). The presence of Arselon filaments can withstand large tensile loads by 3-4 times. The thickness of the microwire bundle is not noticeable on the surface of the seat upholstery. Excellent technological possibilities for the manufacture of heaters, namely, by placing an element on a heated surface, you can get a given power by connecting a certain number of wires. It is possible to install two bundles connected together without significantly increasing the thickness of the heating element. The cost of a heating element bundle is five times cheaper than a bundle with a fluoroplastic sheath. The thickness of the wires is 2-3 times thinner than that of analogues, which significantly increases the alternating load.

As a result, operational indicators are improved, assembly technology is simplified, and a flat form of the heating element is obtained that is not noticeable under the seat upholstery.

Claims (1)

 A flexible heating element, including a bundle of resistive wires, characterized in that it is made in the form of a bundle of enameled resistive microwire and reinforcing threads with strapping of the beam with a thread made in 0.5-1 cm increments.

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