SU1504817A1 - Shf-=eating device - Google Patents

Description

The invention relates to techniques for microwave heating. The purpose of the invention is to improve the uniformity of heating by adjusting the input level

2

powerful τι. The device for microwave heating includes a microwave generator, the output of which is connected to a power divider made in segment 1 of a rectangular waveguide, the end wall 2 of which is short-circuited and configured to move along the narrow walls of segment 1, metal rectangular plates 3 and 4 rigidly connected wall 2 and located in the slits of segment 1, as well as two segments 5 of coaxial lines forming four output channels for supplying energy to the heating chamber. In the normal position of the wall 2, the power in the output channels

Microwave

SP

Microwave 9 •

and

l ¹¹

Microwave I

And figs!

1504817

lah distributed equally. When wall 2 is moved upward, plate 3 extends through the slit of segment 1 outwards for some distance, and plate 4 moves inwardly into segment 1 by the same distance. As the connection between segments 5 and extended plate 3

decreases, the power in the two output channels decreases, and in the other two channels it increases. The goal is achieved due to the presence of four channels of energy supply to the chamber, which increases the "* number of sides of the heated object.

3 il.

The invention relates to devices for heating materials microwave energy

hygiene and can be used in chemical, medical, radio engineering, food and other sectors of the economy.

The purpose of the invention is to increase the uniformity of heating by adjusting the input power level.

FIG. 1 shows a device for microwave heating, a longitudinal section; in fig. 2 shows section A-A in FIG. one; _h 25

on fig.Z - block diagram of the device for microwave heating.

A device for microwave heating contains a microwave generator, the output of which is connected to a power splitter, / Executed on segment 1 of a rectangular waveguide, the front wall 2 of which is short-circuited and made to move along the narrow walls of segment 1, metal rectangular plates 3 and 4 are rigidly associated with the wall 2 and positioned in the slots of the segment 1 extending along the axis of the section 1, in the middle of the wide wall _l facing each other, two segments of 5 40 coaxial lines forming the four output channels 6-9 for supplying power heating chamber 10 and arranged coaxially in pairs perpendicular to the wide 45 walls of segment 1, symmetrically with respect to plates 3 and 4 at a distance (O, 2-O, 3) a, where a is the size of the wide wall of segment 1, and the inner conductors of the segments 5 · βθ

pass through segment 1.

Device for microwave heating works as follows.

In the normal position of the wall 2 (the protrusions have the same height) 55 power in the output channels 6-9 is distributed equally. When the wall 2 is moved upwards, the plate 3 extends through the slit of the segment 1 to the outside for some distance, and the plate 4 moves inward of the segment 1 to the same distance. Since the connection between the segments 5 and the extended plate 3 decreases, the power in the output channels 6 and 8 decreases, and in the output channels 7 and 9 increases, respectively.

The presence of four channels of energy supply to the chamber (Fig. 3) increases the number of sides of the heated object exposed to the direct action of the microwave at least 2 times, and the presence of power control allows you to change the level of microwave energy in the arms of the divider by 20-50%.

If necessary, energy can be supplied not from the four sides of the object, but from two, but on each side to irradiate two parts of the object, which also improves the heating uniformity.

Moving the moving plates along the axis of the waveguide makes it possible to adjust the matching of the waveguide-coaxial power divider in the frequency band of 2.0% with an VSWR not exceeding 1.5.

Claims (1)

Claim Device for microwave heating, containing a microwave generator, the output of which is connected to a power splitter, the outputs of which are connected to the corresponding inputs of the heating chamber, the power divider is made on a segment of a rectangular waveguide, the end wall of which is short-circuited, characterized in that by adjusting the input power level, the end wall is made with the ability to move along the narrow walls of a segment of a rectangular waveguide, along the axis of a segment of a rectangular wall novo5 Yes, in the middle of the wide walls, opposite one another there are slots in which the inserted metal rectangular plates are rigidly connected to the end wall, the outputs of the power divider are the inserted segments of coaxial lines arranged coaxially in pairs perpendicular to the wide wall 15048.7 6 kam segment of a rectangular waveguide, symmetrically with respect to metal rectangular plates at a distance (0 2-0,3) a, where a is the size of the wide wall of a segment of a rectangular waveguide, and the inner conductors of the segments of coaxial lines pass through a segment of a direct carbon waveguide. A-A FIG. 2 1504817