DE2435522A1 - DEVICE FOR DIELECTRIC HEATING USING MICROWAVES - Google Patents

Description

Our reference: 74/1 Hannover, the I9. July 1974

ι ¹ gg / each

Hermann Purfurst KG engineering office

5001 Altwarmbüchen OpelsLr. 22nd

Device for dielectric heating by means of microwaves

The invention relates to a device for dielectric heating of strip-shaped or strand-shaped goods made of plastic or rubber, in which the material is characterized by one or more different geometries connected in series or dimensions having microwave treatment rooms is performed, wherein in the treatment room or rooms Microwave energy is coupled.

From DT-OS 1 565 261 it is known for microwave systems with a cavity resonator an oscillation type converter rotating coaxially to the coupling system of the microwave energy to be provided. This transducer preferably consists of a disc covered with metal strips. This design of a microwave system is intended to achieve a uniform field distribution and heating of the goods will.

Another known cavity resonator for microwave treatment (DT-OS 1 540 978) has a field stirrer, the wings of which, when rotated, reach one after the other in front of the coupling opening. Also with this arrangement a more uniform energy distribution can be achieved in the cavity resonator.

500888/0 996

Tests carried out showed that with such known field stirrers or metal-covered disks a completely uniform heating of the goods is not achieved. The pundits or similar elements also turn out to be a training of the shown facilities for continuous operation as a hindrance. This is especially the case and makes - sometimes the arrangement of a peld stirrer impossible, when the dimensions of the microwave treatment room are very small.

In order to guide the item to be treated at least once through an area of maximum energy into a part of a treatment room in a continuously operating microwave system, DBGM 72 11 759 proposes that several treatment rooms connected in series run at an angle to the transported item. A completely uniform application of energy and heating of the goods cannot be achieved even with an embodiment according to this proposal.

The invention is based on the object of creating a device of the type described above, which is characterized by a more even energy distribution in the microwave treatment room or rooms.

The invention solves the problem in that one or more Microwave treatment rooms are designed to be continuously rotatable or continuously periodically movable.

Through the invention, it becomes possible to have an often changing To achieve distribution of the microwaves in the microwave treatment room. The respectively moving or rotating microwave treatment room is evenly filled with energy on average.

509886/0996

An embodiment of the invention is based on the drawings explained in more detail below:

FIG. 1 shows a device for dielectric heating with rotatably mounted microwave treatment rooms in longitudinal section.

Figure 2 shows the subject of Figure 1 in cross section along line H-II.

Figure J shows a cross section along line IH-III in Figure 1.

In .einem machine frame 4 of a microwave system are Microwave treatment rooms stored. They consist of two fixed waveguide sections 5 and 6 and one between fixed waveguide sections 5 and 6 over attached Waveguide sections 7 and 8 rotatably arranged in roller bearings 9 and 11 resonator chamber 12. The waveguide sections are connected to one another via rotary couplings 17 and 18.

The stationary waveguide sections 5 and 6 are not shown here by means of their end flanges 13 and 14, respectively Supply and discharge devices for the material to be heated and the microwave energy connected. It is also possible, the microwave energy through in the fixed waveguide sections to couple in feeds arranged perpendicular to the axis.

A V-belt pulley 15 is on the circumference of the rotatable Waveguide section 8 placed positively. An applied V-belt 16 leads to one not shown here Drive by which the continuous rotation of the microwave treatment rooms is effected during operation. Any other The type of movement of the treatment rooms requires a corresponding gear.

s ο 8 * η ΰ / cy 9 e

The resonator chamber 12 has a square cross section. When the microwave treatment rooms are rotated, this cross-sectional shape causes the reflected microwaves to change continuously. The goods conveyed through the microwave treatment rooms by a transport device (not shown here) with an endless conveyor belt are exposed to a uniform action of energy on average. By designing the cross-section of the attached waveguide sections 7 and 8 deviating from a circular shape into another symmetrical or an asymmetrical cross-section, the equalization of the energy effect can still be promoted.

Claim to protection

5118886/0

Claims (1)

PROTECTION CLAIM Device for dielectric heating in a strip or strand shape Goods made from plastic or rubber, in which the goods are different geometry or dimensions having microwave treatment rooms is performed, wherein in the or microwave energy is coupled into the treatment rooms, characterized, that one or more microwave treatment rooms are designed to be continuously rotatable or continuously periodically movable are. Blank page