SU1003388A1 - Device for heat treating of dielectric materials - Google Patents

Description

(54) DEVICE FOR HEAT TREATMENT OF DIELECTRIC MATERIALS

The invention relates to the heat treatment of dielectric materials and can be used for drying moving sheet electrical insulating materials.

A device for the heat treatment of dielectric materials is known, comprising a generator connected to a heating chamber in which a retarding system l is located.

However, the known device has inadequate heating uniformity.

The purpose of the invention is to increase the uniformity of heating.

This goal is achieved by the fact that the device for heat treatment of dielectric materials, containing a generator connected to KeiMepe heating, in which a retarding system is located, is last performed on two meander lines installed one above the other and offset from one another by half the period , at the same time the step of the meandering turn is equal to the distance of the order of them, and the width of the meander lines is equal to a quarter of the generator wavelength.

FIG. 1 shows the structural electrical circuit of the proposed device / FIG. 2 - structures of meander-lines with slow system.

The device for heat treatment of dielectric materials comprises a high-frequency or ultra-high frequency generator 1, a valve 2, a heating chamber 3, an ultra-high frequency generator 4, a second valve 5,

10, a comparison unit 6, an amplifier 7, a direct current, a conveyor belt 8, a voltage setpoint generator 9, a meander line 10 and 11, an absorber 12.

I The device works as follows.

15 way.

Electromagnetic energy of the generator 1 through the valve 2 enters the heating chamber 3 and then to the comparison unit 6-20. The electromagnetic energy of the generator 4 through the valve 5 enters the heating chamber 3 and to the comparison unit 6, to the third input of which the reference voltage is supplied from the voltage setting device 9, proportionally equal to 25 ° C. Snagsch, entering from the heating chamber 3, carries information about the moisture of the material being dried. At the output of the comparator unit 6, a differential signal is obtained on the state of the material being dried, which is amplified in the DC amplifier 7 and controls the mode of the generator 1. The conveyor belt 8 with the dried IM material moves between lines 10 and 11 located in spacer 3, while the material being dried is subjected to a high frequency and microwave field. In this case, the intensity of the drying increases several times, since the inductance of a double square wave line, the conductors of which are displaced relative to each other by half a period, means that it exceeds the inductance of a single square wave line. Sledovatelnu; the retardation and stored energy in the retarding system several times increases, which causes a stronger concentration of the electric field between the square lines 10, 11 and an increased drying intensity. This reduces the dispersion of the waves in the system, which increases the uniformity of drying over the entire area of the material being dried. This is due to the fact that the current in the pro (the opposite conductors of the displaced meander lines 10 and 11 flows in the same direction (Fig. 2, conventionally indicated are the directions of the current sign w + and -). The length of the meander line 10 and 11 determines the width of the dried sheet material. To achieve a more uniform heating of the moving sheet material across its entire width, the pitch And turn of each meander line 10 and 11 paV

Claims (1)

fu veins to the distance between them, and the width H of the meander lines 10 and 11 is equal to a quarter of the wavelength of the generator 4. Therefore, it is obvious that due to this design of the heating chamber 3, the frequency range of 20-40 MHz, i.e. the range that is most used by industry and the powerful; high-frequency generators for this range are commercially available. The use of the proposed device in comparison with the known one allows to increase the uniformity of heating. The invention The device for the heat treatment of dielectric materials, is a generator containing a generator connected to a heating chamber, in which a retarding system is located, characterized in that, in order to improve heating uniformity, the retarding system is performed on two meander lines one above the other. and shifted relative to each other by half a period, with the step of the turn of the meander lines equal to the distance between them, and the width of the meander lines is equal to a quarter of the generator wavelength. Sources of information taken into account in the examination, 1. French Patent No. 2413842, cl. H 05 B 9/06, 1980 (prototype). rr  w