US1309346A - Schuckertwerke - Google Patents

Description

A. WERNER.

OIL C00,LED ELECTRIC APPARATUS. I APPLICATION r|LED MAR.2s.1915. Ringwfn Dic. 1.1918.

Patented July 8, 1919.

UNITED ysrarns PATENT OFFICE.

ALBERT WERNER, 0F BERLIN-FRIEDENAU, GERMANY, ASSIGNOR TO SIEMENS- SCHUCKERTWERKE, G. M. '.B. H., 0F BERLIN, GERMANY, A CORPORATION OF GERMANY.

specification of Letters raamt.

Patented July 8, 1919.

Application filed March 23, 1915, Serial No. 16,476. Renewed Decemberv, 1918. Serial No. 265,789.

T 0 all whom t may concern Be it known that I, ALBERT lVnnNnR, a. German citizen, and resident of Berlin- Friedenau, Germany, have invented certain new and useful Improvements in Oil-Cooled Electric Apparatus, of which the following is a specification.

'This invention relates in brief to oilcooled electric apparatus, and especially induction transformers, and has principally in view to obviate a difliculty encountered in apparatus of this class-on account of the moisture which penetrates from the outside into the transformer casing at the place where the axle of the apparatus passes through the cover of the saine. Even in case closely fitting stuling boxes are employed at the point of passage this difliculty cannot be solved. In order to avoid this disadvantage, according to my invention the point of passage of the axle through the transformer casing is provided with some kind of an oil s packing, that is with an oil container surrounding the axle at its place of passage through the casing, and a further arrangement is used,\whereby the oil may be permitted to freely expand when its temperature is raised by the operation of the tiansformer. "A

In the drawing .I have shown a few embodiments of my invention; Figure 1 shows an arrangement whereby besides the aforementioned means permittting the expansion of the oil a stuiing box is used together with an oil container' surrounding the same, Fig. 2 represents a construction similar to Fig. l, whereby said stuffing box isessentially replaced by an oil-packing, and Fig. 3 shows a preferred construction, whereby said oil packing is united with an expansion chamber.

In Fig. 1 t indicates the transformer, Z the point 0f passage of the axle throughv the casing which is provided in the well known manner with a stutling box s, which is fully surrounded by the oil container g. lVith this arrangement the moisture containedin the air, as far as it comes in Contact with the transformer, will be receivedby the oil around and above. the stuffing box and will be dissolved. therein, so that it is prevented from entering into the interior of the mam Oil tank of the transformer.

The construction as shown in Fig. l may be more simplified as shown in Figs. 2 and 3, wherein the aforen'ientioned stuffing box is entirely avoided. The same reference letters are used throughout the igures for the same devices. In the case of Figs. :2 and 3 at the cover of the oil tank at the point of passage of the axle solely akind of loosely litting bearing for the axle is provided for, so that the inclosed oil will form a kind of packing between the axle and the cover of the casing.

If the transformer is provided with an expansion chamber which receives the surplus of oil due to expansion it is preferable to make the place of passage of the axle through the cover of the voil tank of such dimensions that the oil in the space near said passage will be able to freely follow the fluctuations of the oil level in the expansion chamber. An arrangement of this kind iis shown in Fig. 2. In this modification the cover of the tank is so formed as to create an additional chamber g which substantially equivalent to the separate chambers g of Figs. 1 and 3. The opening in the cover through which the axle passesA is of such dimensions, as indicated in the drawing that the oil in the container.' g will always be of the same level as that in the container a. If now after some time the oil in the container g has received moisture from the exterior air it will yet not be necessary to provide a special closure toward the main tank, since the fluctuations of the, oil in the expansion chamber take place very slowly, so that a mixing of this oil with the oil in the main tank needs not to be feared on account of the small cross-section of said chamber as compared with the size of the main tank. The oil in the container f/ may easily be let ofi' and replaced by new oil, if found necessary. Thus special tightening means, such as stuiing boxes, will be entirely Aavoided in the constructions of Figs. 2 and 3 at the point of passage of the axle through the cover as well as at any other place. For this latter purpose the driving mechanism Z) for the transformer axle and the bearing l is.arranged above the highest level of the oil, as shown inthe drawing. An Opening 0 may be provided at the upper part of the container g above the level of the pil, such as shown in the drawing, in order to equalize the air pressure between the container g and the outer air.

In the case of Fig. 3 the oil container g is itself constructed in the manner of an expansion chamber. It is preferable to give to the bottom 0f the container g a certain slope and to provide a discharge pipe -r at the deepest point in order to be alole to remove the oil which has become unfit for service due to the collection of greater quantities of moisture. Or, the pipe 7* may only be used for letting off the meister part of Vthe oil, which on account of the greater specific gravity has collected near the bottom of the container.

Having thus described my invention I claim as new and desire to secure by Letters Patent of the United States tl. An oil-cooled electric apparatus comprising an oil tank, a cover therefor, a member rotatably mounted in said tank and having an axle passing through said cover, an oil chamber arranged above said cover and forming an oil packing between said axle and said cover, and means, adapted to permit expansion of the oil in said tank, for permanently keeping said tank Completely filled with oil.

Q.'An oil-cooled electric apparatus comprising an oil tank, a cover therefor, a member rotatablyv mounted in said tank and having an axle passing through said cover, an oil chamber arranged above said cover forming an oil packing between said axle and said cover, said oil chamber being adapted to permit expansion of the oil in said tank and to permanently keep said tank completelyfilled with oil.

3,. An oil-cooled electric apparatus comprising an oil tank, a cover therefor, a member rotatably mounted in said tank and having an axle passing through said cover, an oil chamber arranged above said cover forming an oil packing between said axle and said cover and communicating with the interior of said tank, said oil chamber being adapted to permit expansion of the oil in said tank and to permanently keep said tank completely filled with oil.

4. An oil-cooled electric apparatus cornprising an oil tank, a cover therefor, a member rotatably mounted within said tank and having an axle passing through said cover, an oil chamber mounted upon said cover for permit-ting expansion of the oil in said tank and at thesame time forming an oil packing between said axle and said cover at the place of passage therethrough.

5. An oil-cooled electric apparatus comprising an oil tank, a cover therefor, a member rotatably mounted within said tank and having an axle passing through the same, an oil chamber mounted upon said cover and permitting expansion of the oil packing between said axle and said cover at the place of passage therethrough, a bearing and a driving mechanism for rotating said axle, said bearing and said driving mechanism being located at the top of said chamber and above the highest oil level therein.

(3. An oil-cooled induction transformer comprising an oil tank, a cover for said tank, a rotor body' having a vertical axle passing through said cover, and a chamber provided on top of said cover surrounding said axle at its passage through said cover, said chamber permitting expansion of the oil in said tank at the same time forming an oil packing between said axle and said cover.

In testimony whereof I have hereunto set my signature in the presence of two subscribing witnesses.

ALBERT lVERNER.

Titnesses VOLDEMAR HAUPT, HENRY HAsPER.

Images