US1537875A - Cable sleeve - Google Patents

Description

May 12, 1925.

w. PFANNKUCH CABLE SLEEVE Inventor: Wilheim p'rannkuqzh, by I is Attorney;

Patented May 12, 1925. I

. UNITED STATES 1,537,875 PATENTOFFICE.

WILHELM PFA-NNxUcH; or BERLIN, GERMANY, ASSIGNOR ro GENERAL Emma,

. COMPANY, A conroaarxo'n on NEW YORK.

CABLE SLEEVE.

Application filed December 18, 1922. Serml No. 607,584.

To (Jim/m it may concern:

Be it known that I, VVILIIELM PEANN- lUFCH, a citizen of the Republic of Germany,

residing at Berlin, Germany, have invented 5 certain new and useful Improvements in Cable Sleeves, of which the following is a specification.

The subjectof the invention is a cable sleeve for high power lead sheathed cables, which is provided with special means .to effect a filling thereof with insulating substance free of air bubbles. The insulating mass, with which cable sleeves and cable joints for hi h power cables are filled, should as ful y as possible fill all hollow spaces within the sleeve and provide a thor-. oughly good insulation without any air spaces between the cable, strands or their connecting means and the sleeve wall. The presence of air chambers even if very small etween the strands and the inner walls oi thesleeve is frequently the cause of perforationsand explosive destruction of the sleeve, because the air enclosed in the insulatages em loyed. q

In or or to avoid the formation of hollow spaces or air chambers in the sleeve or in, the-cable joints, there have been tried many widely different schemes, for example, fill ing, masses have been used, which when cooling contract as little as possible and form minimum voids; the sleeve hasalso been filled in a vacuum in order to avoid the presence of air. 7

In the present invention an entirely new icourse is taken in order to accomplish the said object and by means that may be used alone or in conjunction with the already known means.

The new arrangement is based on the principle that the filling mass when it flows into the sleeve in athick stream through a single opening at the highest part of the sleeve not only entrains air, but when striking the strands and connectingjoints of the strands,

'especiallyin multiple cables, entraps the air presentand prevents it from escaping.

In the present invention'these disadvantages are eliminated by the following arrangements and instrumentalities: 4

The filling mass is not oured into the sleeve at the highest point, jut through one or several lateral openings. 'Of especial ad vantage is the arrangement in which a Cid ing mass becomes ionized at the high voltshown three strands 2 of insulated cable3 vided for the pouring in, which do not lie atthe highest point of the sleeve.

In order to accomplish a safe pouring in of the mass through these lateral comparw t-ively small openings, there is arranged on top of the middle part of tlre sleevc a domezlike extension serving as a collector recep tacle, which in a manner forms a common distribution reservoir for the lateral openings. lVithin this dome, extending to both sides of the sleeve, there are advantageously provided openings in the highest point of the sleeve wall and as near as possible to the ends of. the'collector receptacle, which serve for the escape of the air from the sleeve.

The mode of application of new air.- rangement will be understood by reference to the example shown in the drawing.

Figure -1 shows a cable sleeve partly in longitudinal section, partly in side view, and. Fig. 2 is a cross section: through the middle of the sleeve. I

In the tubular lead sleeve shell 1 there are tau u spliced in any manner desired.

Over the top side of the tubular shell there isarranged in accordance with the in.- ventiona dome-shaped auxiliary structure or shell 4 which is provided with a filling in or pouring opening or nozzle 5 for the entrance of the filling mass. Within this dome. 4 there are arranged at about of the height of the sleeve the filling-in 'open ings 6, advantageously disposedtherein in two or more rows in the longitudinal direction of the sleeve. the escape of the air are located at the high-- est. point of the sleeve within the dome. as

larger number oi. small openings are pro- Other openings 7 for far as possible toward the two ends thereof.

Practically all lead sheathed cables are installed in a more or less horizontal position and accordingly it is customary to refer in the uppermost portion of such a cable or the joints thereof as the to while the vertical or approximately vert cal portions at the sides thereof are referred to as the sides and this terminology is employed in this cam.

The mode of operation of the arran ement is as follows: The stream of the ot filling mass poured through the filling-in 0r pouring opening 5 spreads on the intermediate wall of sleeve 1 in the manner shown by the arrows in the drawing and entns' through openings 6, which together have large opening area, into the sleeve, flows down. along the walls on the inside and first collects the bottom of the sleeve. The mass gradually rises in the sleeve, presses the air out by the openings 7 and so gradually fills in all the intermediate spaces between the strands from below upwardly As the air can freely escape upwardly Without hindrance by the entering mass, the enclosure or entrapment of air between the strands is avoided. In consequence of the arrangement of the air vents 7 on the uppermost portion of the sleeve all the air can escape from the sleeve and be carried oil by the dome l and the filling-in or pouring opening 5, and if need be also by a vacuum pump.

The arrangement of the large number of filling-in openings 6. allows of a rapid distribution of the mass throughout the entire length of the sleeve. In consequence it is impossible, even when the mass in the sleeve has cooled o somewhat for spaces with air.

or what is still more spaces to form.

By this arrangement in accordance with th invention, the further advantage is obtained that the mass does not strike the strands in its hottest state, as is the case when directly poured in, but only'after it has cooled oil somewhat by extended contactwith the sleeve walls. When the hot mass directly strikes the strands, as in the methods hitherto used, there is danger that the impregnating mass of the paper or other material used for the insulation of the strands becomes liquid and escapes from the paper or other insulation into the filling mass. whereby the insulation of the strands is decreased. This danger is eliminated in the practice of my invention.

A similararrangement to that described for cable sleeves, can also be employed in cable joints and other cable joints and other cable parts. While I have shown and dcdangerous airless scribed the best embodiment of the invention known to me, I do not. desire to be re: stricted thereto.

What I claim as new and desire to secure by Letters Patent of the United States is: l. A. sleeve for sheathed electric cables comprising tubular shell provided in its side Walls with pouring holes, an auxiliary shell secured to the top portion 01 said tubular shell to enclose said pouring holes and form with said tubular shell a distributing reservoir for filling material, and a pouring entrance in said auxiliary shell.

2.- A sleeve 'for sheathed electric cables comprising a tubular shell provided in its side walls with distributed pouring apertures and in its upper wall with vent apertures, an auxiliary shell secured to said tubular shell to enclose said side andvent open.-

ings and form with said tubular shell 3. distributing reservoir for fill ng material, and

a pouring entrance in said auxiliary shell.

l. In combination, jointed sheathed cables,

a shell which surrounds the joint and also the adjacent ends of the cables, and is provided with pouring holes. located below the top thereof, a second shell which surrounds the first and is sealed at its ends, said shells defining between them av rcservoir'for insu lating material, and a pouring entrancc in said second shell.

In witness whereof, I have hereunto set my hand this 29th day of November 1922.

\VILHELM PFANNKUCH.

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