UA75083U - Film resistive electric heater - Google Patents

Abstract

A film resistive heater of multi-layer structure comprises an integral heating polymeric layer, wherein a resistive composition on the base of carbon mixture is used, to increase an effective area it is applied in the form of printed resistive bands and located along edges of current conductive electrodes of silver printed layer and a copper bus laminated with water-proof and fireproof film; moreover to maintain the required heating temperature it comprises a semiconductor polymeric layer having positive temperature resistance coefficient; the layer is applied separately according groups of resistive bands on one of the current conductive electrodes and is pressed between the printed silver layer and copper bus.

Description

to one of the conductive electrodes and pressed between a layer of printed silver and a copper busbar.

The equivalent electrical circuit of the film resistive electric heater is shown in Fig. 1, general view in fig. 2, and the structure in fig. 3.

The proposed film resistive electric heater contains a dielectric substrate 1, on which a heating element 2 in the form of groups of resistive strips made of carbon paste is printed using printing technology, on the edges of which there are conductive busbars, one of which is formed by a printed layer of silver Z and an applied copper bus 4, and the second bus is formed by applying a printed layer of silver Z and a special semiconductor polymer 5, the resistive properties of which have a positive temperature coefficient of resistance (TCO) of the "posistor" type, applied to separate groups of resistive bands of the heating element 2, with subsequent pressing of copper busses 4 and lamination with a waterproof, fireproof, protective film, for example, polyester. In this way, the heating element of the film resistive electric heater is connected to the network through a serially connected non-linear resistor with a positive TKO, the parameters of which are selected in advance according to a certain operating temperature.

The film resistive electric heater works in the following way. When the power supply is connected, the current flows to the heating layer through copper busbars 4, semiconductor polymer 5 and printed silver layer 3, which provides a reduction in transient resistance at the point of contact with the carbon paste. The process of heating the film begins with a simultaneous increase in the temperature of the semiconductor polymer 5. When the set temperature of the semiconductor polymer 5 is reached, the resistance of the semiconductor polymer 5 increases sharply, the current in the circuit drops, so further heating is limited. The temperature regime is stabilized, and the spectrum of thermal radiation narrows to the range most acceptable for the user's comfortable state.

Thus, the proposed useful model ensures: convergence of the spectrum of infrared radiation of the film with the spectrum necessary to ensure a comfortable state of the user; reduction of electricity losses for regulation due to thermal stabilization of the thermal regime from the premises without additional means.

Claims (1)

FORMULA OF THE USEFUL MODEL Film resistive electric heater, which has a multilayer structure and includes inseparably ZB are connected to each other by a heating layer, which uses a resistive composition based on carbon paste, which is applied in the form of printed resistive strips to increase the effective area and conductive electrodes located on the edges of a printed layer of silver and a copper bus laminated with a waterproof, fire-resistant film , which differs in that it contains a semiconductor to maintain the given heating temperature 40 polymer layer with a positive temperature coefficient of resistance, which is applied separately in groups of resistive strips on one of the conductive electrodes and pressed between a layer of printed silver and a copper bus.