US2313029A - Vapor electric device - Google Patents

Description

Patented Mar. 2, 1943 UNITED STATES PATENT OFFICE VAPOR ELECTRIC DEVICE Property Custodian Application May 20, 1941, Serial No. 394,308 In Germany February 1, 1940 4 Claims.

Our invention relates to a vapor electric device and particularly to an anode insulator for a high voltage are converter.

Heretofore, arc converters of the steel-tank type have been equipped, as a rule, with anode bushings of tubular shape. And in are converters for high voltages, in which auxiliary electrodes are mounted along the discharge path whose potentials have values comprised between the anode and the cathode potential, the anode insulators are often used for supporting said auxiliary electrodes. But when this practice is resorted to, anode insulators of considerable length must be used, in order to establish creepage paths of sufficient resistance between the supporting members for said auxiliary electrodes.

It is the purpose of the present invention to produce an anode insulator of relatively small dimensions which will have more in particular a short length in the direction of its longitudinal axis and which, for this reason, will not occupy much space. An anode insulator designed in accordance with the present invention essentially consists of a disc provided with a plurality of concentric, ring-shaped ribs to which, when the necessity arises, can be fastened grid-structures and other auxiliary electrodes.

It i desirable from a manufacturing standpoint to choose the lengths of these concentric ribs in the direction of the longitudinal axis in such a manner that in the direction from the center towards the outer edge of the anode-insulator disc, the ribs will become shorter and shorter. The outermost rib can be utilized for establishing a connecting joint between the anode insulator and the evacuated vessel, or between this insulator and the tubular extension chambers or arms of the arc-converter vessel.

An anode insulator designed in accordance with the present invention has the important advantage that in spite of its short length in the direction of the longitudinal axis, it is suitable for supporting the auxiliary electrodes, while on account of the peculiar disposition of the ribs, long creepage distances will separate the various metal parts attached to the anode insulator.

Other objects and advantages of our invention will be apparent from the following detailed description taken in conjunction with the accompanying drawing in which:

Figure 1 is a sectional elevation through an anode assembly according to our invention; and

Fig. 2 is a similar view showing a modification according to our invention.

The exemplary showing according to Figure 1 of this drawing shows an anode bushing arranged in accordance with the present invention, involving the use of an anode insulator (made, for instance, of a ceramic material) which essentially consists of a disc I provided with concentric, ring-shaped ribs 2. The outermost rib is used for attaching the anode insulator to the metal wall 3 of an arc-converter vessel by means of a vacuum-tight seal. The cylindrical member formed by the innermost rib surrounds the anode stem 4 to which the anode body 5 is attached. A supporting member 6 for an auxiliary electrode is also attached to one of the ribs 2 of the anode insulator.

An anode insulator of slightly difierent construction is employed in the anode bushing illustrated in Fig. 2 of the drawing. The ribs 2 of this anode insulator are of different lengths; in fact, they become shorter as we proceed from the center towards the edge of the insulator disc. This insulator can be heated by means of a heater coil 1 that is located at the periphery of the insulator, between the ribs 8.

While for purposes of illustration we have shown and described specific structures according to our invention, it will be apparent to those skilled in the art that many changes and modifications can be made therein without departing from the true spirit of our invention or the scope of the appended claims.

We claim as our invention:

1. An anode lead-in bushing for a vacuum arc device vessel comprising a substantially annular body portion of insulating material, a substantially centrally located opening in said annular body, an anode stem passing through said opening, and secured in vacuum-tight relation thereto, a plurality of annular ribs concentric with said centrally located opening, the innermost of said annular ribs being of greater length than the remaining ribs.

2. An insulating bushing for introducing a lead-in conductor into the vessel of a vapor-electric device comprising a disc-like body of insulating material, there being an opening in said disc, a conductor extending through said opening, a vacuum-tight seal between said conductor and said disc, a plurality of annular ribs concentric with said opening, said ribs decreasing in height from the center to the periphery of the disc, means for making a vacuum-tight seal between said vessel and the outermost of said ribs.

3. An insulating bushing for introducing a lead-in conductor into the vessel of a vapor-electric device comprising a disc-like body of insulating material, there being an opening in said disc, a conductor extending through said opening, a vacuum-tight seal between said conductor and said disc, a plurality of annular ribs conery of said disc and a heating element between said ribs.

4. An anode insulator according to claim 2, characterized by the feature that a heater coil 5 is provided at the periphery of the insulatcr.

ALFRED SIEMENS. HANS VON BERTELE.

WILLI BURGSMTJ'LLER.

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