US1959191A - Transformer - Google Patents

Description

H. M. ACLY TRANSFORMER May 15, 1934.

Filed May 10, 1952 IhvehtOT': HGTTH M. Acly, MM

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Patented May 15, 1934 UNITED STATES PATENT OFFICE TRANSFORMER York Application May 10, 1932, Serial No. 610,381

2 Claims.

My invention relates to transformers and more particularly to a transformer provided with a casing containing insulating liquid in which the transformer is immersed. In many cases, the

liquid in which a transformer is immersed does not completely fill the casing, the space above the liquid being filled with air or other gas. If this space is not tightly sealed, some of the liquid may be spilled and lost from the casing,

particularly during shipment of the transformer, and the insulating properties of the liquid may be impaired by dust and moisture and by the oxygen of outside air entering the casing. The general object of the invention is to provide an improved transformer casing in which the transformer and liquid within the casing are effectively sealed.

The invention will be better understood from the following description taken in connection 0 with the accompanying drawing in which Fig. 1 is a view, partly in section, of a liquid immersed transformer with a sealed casing constructed in accordance with the invention, and Fig. 2 is a plan view of the casing on a reduced scale.

Like reference characters indicate similar parts in both views of the drawing.

The casing 10 shown in the drawing contains a body of insulating liquid 11 in which a transformer 12 is immersed. The upper edge of the 31) wall of the casing has an outwardly projecting rim 13 which supports a removable cover 14 of the casing. The liquid 11 and transformer 12 are sealed in the casing 10 by a flexible diaphragm 15, the outer edge of the diaphragm being clamped between the outer edge of the cover 14 and the rim 13. The rim 13 has a flat upper surface and a gasket 16 between this surface of the rim and the edge of the diaphragm assures a liquid and gas tight joint. A ring 17,

preferably of metaLis provided over the gasket 16 and between the edge of the diaphragm 15 and the under surface of the cover 14, the edge of the diaphragm 15 preferably being secured to this ring 17 by some suitable adhesive. The

cover 14 is clamped down by a clamping ring 18 which is formed in sections drawn together by screw clamps 19.

The diaphragm 15 is not stretched tightly but normally sags down loosely below the level of its clamped outer edge from which it is suspended, as shown in Fig. 1. Thus, the diaphragm may readily rise and fall as the liquid 11 expands and contracts in response to changes in temperature. The space between the diaphragm 15 and the cover 14 is connected with the outside air through notches 20 in the upper surface of the ring 17 so that the diaphragm may rise freely toward the cover.

The diaphragm 15 effectively prevents outside air, moisture and dust from reaching the liquid 11 and prevents leakage and loss of liquid if the transformer is handled roughly or even if it is accidently tipped over on its side as may happen during shipment. The inner surface of the cover 14 is shaped approximately to fit the diaphragm 15 substantially throughout its surface when the diaphragm is for any reason forced into its extreme position towards the cover. Thus, for example, if the transformer is tipped onto its side, the cover will support the diaphragm and prevent injury to it.

The invention has been explained by describing and illustrating a preferred embodiment thereof but it will be apparent that changes may be made without departing from the spirit of the invention and the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent in the United States is:

1. A casing containing a transformer immersed in an insulating liquid, said casing having a re- 30 movable cover, and a flexible sealing diaphragm, the outer edge of said diaphragm being sealed to the casing wall near its upper rim, the diaphragm being loosely suspended from its outer edge, and the inner surface of said cover being disposed and shaped substantially throughout its surface approximately to fit said diaphragm when the diaphragm is forced into its extreme position towards the cover.

2. A casing containing a transformer immersed in an insulating liquid, said casing having a removable cover, a flexible sealing diaphragm extending between the upper edge of the casing wall and the outer edge of the cover, and a ring between the outer edges of said diaphragm and the cover, the outer edge of said diaphragm being secured to said ring and being sealed to said casing rim, the surface of said ring next to the cover being notched to provide communication between the outside air and the space between said diaphragm and cover.

HARRY M. ACLY.

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