DE2454582A1 - DEVICE FOR PREVENTING LEAKAGE OF RF ENERGY FROM BREAKINGS PLACED IN WALLS OF HIGH FREQUENCY TREATMENT DEVICES - Google Patents

Description

SIEMENSAKTIENGESELLSCHAFT Erlangen, November 1, 2015. 197 * 1

Berlin and Munich Werner-von-Siemens-Str. 50

Our reference: VPA 74/3266

Hnn / Po

Device for preventing the escape of HF energy from openings arranged in the walls of high-frequency treatment devices

The invention relates to a device for preventing the escape of HF energy from openings arranged in the walls of high-frequency treatment devices, in particular for radiative sealing of rotating shafts protruding through the openings.

Arrangements of this type have become known from DT-PS 975 399. In this known device, the shaft protruding through the housing is designed in the form of a coaxial conductor in such a way that the geometrical dimensions of the mechanical parts form --— - containment pots. Here-

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a high-frequency seal can be achieved through this, but only for very specific frequencies and possibly their even, harmonic harmonics.

With such devices, however, the underlying object of the invention cannot be achieved, above all in the creation of a contact-free and therefore maintenance-free high-frequency seal that can be manufactured and operated economically of operationally rotating shafts and their wall openings, which at the same time have a contactless Forms bearing current relief arrangement and can also be used with shafts that heat up during operation and thereby expand in length.

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According to the invention, this is achieved in that each opening is assigned a capacitor arrangement which consists in a manner known per se of ring-shaped or disk-shaped capacitor electrodes, one of which has a part the rotating shaft and the other part is stationary and with a membrane-like, metallic disc an earthed object, e.g. with the wall of the high-frequency treatment device, is electrically connected. An advantageous constructive solution is achieved by that the capacitor electrodes on a two-part, drum-shaped clamping sleeve in the manner of a labyrinth seal arranged and both parts are connected via a bearing attached to the lower potential side, the keeps the distance between adjacent capacitor electrodes at least almost constant. The purpose of saving components is it is advantageous that the stationary and / or rotating capacitor electrodes are each reinforced with one on one side Capacitor end plate can be clamped, the rotating capacitor electrode end plate at the same time as Slinger is used for liquids running along the shaft.

In order to prevent disturbing harmonics from escaping through the opening in the wall of the housing and thus also above the cut-off frequency To obtain good attenuation of the arrangement for selective frequencies, it is advantageous that the capacitor electrode plates have the same spacing but different lengths exhibit. In this way, the or the first individual capacitors in the direction of the machine support bearing as Parallel resonance pot circle formed. To the capacitor to be able to train arrangement as small as possible and to make the plate spacing of the individual capacitors so small that Because of the voltage applied, it is precisely with certainty that no flashovers occur, it is advantageous that the capacitor electrode plates different distances, but the same lengths. So that the capacitor arrangement also from

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untrained workers can be installed and removed, it is advantageous that the capacitor plates and the load-bearing parts are designed as an easily replaceable unit.

In the drawing are exemplary embodiments according to the invention shown.

Show it:

Fig. 1 shows a bearing-side shaft end with an opening in the housing and a capacitor arrangement, which in Section was shown and their capacitor electrode surfaces are arranged concentrically to the shaft are.

Fig. 2 in view and in section two embodiments of the Capacitor electrode arrangement according to the invention.

3 shows a simplified representation of a capacitor electrode arrangement in which the mutual distances (a) are the same, but the lengths {β) are different.

4 shows a simplified representation of a capacitor electrode arrangement in which the mutual distances (b) are different and the lengths of the capacitor electrodes (Ju) are the same.

The shaft 1, which carries, for example, a roller not shown in the drawing and in a room 2 with a high-frequency heating system, e.g. for a continuous paper web, the opening 3 protrudes through the wall 4, which delimits the high-frequency treatment room 2 essentially to the outside. Outside the high-frequency treatment room 2 the machine support bearing 5 is arranged, which at the same time . Should be protected from bearing currents which are known to be of this kind Completely destroy bearings in a relatively short time,

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Each opening 3 is assigned a capacitor arrangement 6, which forms a structural unit by itself. Depending on the spatial conditions, the number and size of the individual capacitors must be provided. Purely the design of the capacitor arrangement is essentially the total capacity required for perfect damping.

The capacitor arrangement consists of ring-shaped or disk-shaped capacitor electrodes 7 and 8, one of which Part 7 with the rotating shaft 1 and the other part 8 is stationary. The fixed part 8 of the capacitor electrodes is via a membrane-like metallic disc 9, e.g. made of copper, with an earthed object, in the present case Trap electrically connected to the wall 4 of the high-frequency treatment device.

The capacitor electrodes are like a labyrinth seal on a two-part drum-shaped clamping sleeve arranged. The clamping sleeve part fastened to the shaft 1 is 11 and the clamping sleeve part which is arranged in a stationary manner is denoted by 12. Both clamping sleeve parts 11 and 12 are Connected to one another via the bearing 13, the bearing still having the task of the actual bearing function, the lateral To keep the distance between the capacitor electrodes at least almost constant. The warehouse 13 is on the weaker potential Side of the clamping sleeve 10 arranged, i.e. on the side facing away from the high-frequency treatment room.

The rotating capacitor electrodes can be on one side are each clamped with a reinforced capacitor electrode end plate 14, as shown in FIG. This capacitor electrode end plate serves at the same time as a flinger for about the shaft 1 running along Liquids.

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In Pig. 3 and 4 show different exemplary embodiments for the arrangement and dimensioning of the capacitor electrodes. In Fig. 3, the clamping sleeve parts 11 and 12 are attached at an acute angle, so that the distance a of the capacitor electrodes 7 and 8 is the same or almost the same; however, the length of the capacitor electrodes J / increases in the direction of the machine support bearing 5. The acute angle of the clamping sleeve parts 11 and 12 can, however, also be attached close to the machine support bearing, so that the capacitor electrodes with the greatest length JL would then face the high-frequency treatment room.

According to the embodiment according to Pig. 4 run the clamping sleeve parts 11 and 12 axially parallel and the capacitor electrodes 7 and 8 have the same length. Be against it the distances b between the capacitor electrodes - from the high-frequency treatment room 2 in the direction of the machine support bearing 5 seen - getting smaller.

The subject matter of the invention is not limited to those shown Embodiments, but it can be modified in several ways. For example, it is advantageous to use the Metallic disc 9 as a whole so thin or to provide this partially with a weaker point 10 that this can follow shaft 1 in the event of changes in length. In addition, it should be achieved that in a any damaged bearing 13 is the outer ring of the bearing rotates as a result of excessive friction and then the membrane-like disc 9 tears off at the weak point. In In this case a signal lamp can light up. The machine as such can continue to run for a short time without hesitation, so that the production process does not need to be disturbed. The replacement of the damaged capacitor assembly can

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then take place in a company-defined break. Since the machine support bearing 5 is always on the weak potential Side of the capacitor arrangement is attached, this is practically no longer flowed through by currents that would otherwise a destruction of the machine support bearing would certainly result in a very short time.

4 figures

6 claims

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Claims (1)

VPA 74/3266 Claims device to prevent leakage of RF energy made of perforations arranged in the walls of HP devices, in particular for the radiation-related sealing of the Rotating shafts protruding through openings, characterized in that each opening (3) has a capacitor arrangement (6) is assigned, which in a "known manner" consists of ring-shaped or disk-shaped capacitor electrodes (7, 8), of which one part (7) with the rotating Shaft (1) and the other part (8) is arranged stationary and over a membrane-like metallic disc (9) with an earthed object, e.g. with the wall (4) the RF treatment device is electrically connected. Device according to claim 1, characterized in that the capacitor electrodes (7, 8) are mounted on a two-part, drum-shaped clamping sleeve (10) arranged in the manner of a labyrinth seal and both parts (11, 12) on a the lower potential side attached bearing (13) are connected, which the distance between adjacent capacitor electrodes (T, 8) holds at least almost constant. Device according to Claims 1 and 2, characterized in that the stationary and / or the rotating capacitor electrodes (T,. "'8) - can be clamped on each side with a reinforced capacitor electrode end plate (14) are, the rotating capacitor electrode end plate (14) at the same time as a flinger for about Liquids running along the shaft (1) are used. 609822/0432 - 8 - VPA 74/3266 4. Apparatus according to claim 1 to 3, characterized in that that the capacitor electrode plates (7, 8) have the same spacing (a), but different lengths (^). 5. Apparatus according to claim 1 to 3, characterized in that the capacitor electrode plates (7, 8) have different distances (b), but the same lengths (Js) . 6. Apparatus according to claim 1 to 5, characterized in that the capacitor plates (7, 8) and the supporting parts (11, 12) are designed as an easily exchangeable unit (6). 609822/0 /, 32 Blank page