US1394982A - Casing for electrical apparatus - Google Patents

Description

M. L. ELDER.

CASING FOR ELECTRICAL APARATUS.

APPLICATION FILED AUG.2V 5, 1191'9.

Patented Oct. 25, 1921.

Inventor: Matt I'Iew L Elcler,

b5 His Jqttorneng.

UNITED. STATES PATENT. OFFICE.

Assioma ro GENERAL ELEc- NEw Yoax.

CASING FOR ELECTRICAL APPARATUS.

Specification of Letters Patent. I

lsatented Oct. 25, 1921.

Appneation mea August 25,4919. serial No. 319,694.

To all 'whom 'it may concern.'

Be it known that I, MATTHEW L. ELDER, a

citizen of the United States, residing at Pittsfield, in the county of Berkshire, State of Massachusetts, have invented new and vuseful Improvements in Casings for Elec- .trical Apparatus,

of which the following is a specification.

My invention relates to tanks or casings for electrical apparatus such as transformers which are provided with means, such as cooling coils, for circulating an auxiliary cooling medium.

In tanks or casings of this character which generally contain oil as the principal cooling medium for the electrical apparatus, some difficulty hasl been experienced in making oil tight the joints, where the ends of-the cooling coil pass through the wall of the tank.

Difliculty, too has sometimes been experienced in properly alining the ends of the coil with the opening in the wall of the. tank, when installing the coil; and also at times in properly deta'ching the coil when it is desired to remove it.

It is the object then of my invention to provide an improved construction which avoids these difficulties. In accomplishing this end I make use of a coupling device for the ends of the coil which is independently secured to the coil ends and to the tank. Such a construction permits the connections for supplying the auxiliary cooling medium, which is generally water, to be made at a point that is out of contact with the body of oil; hence water cannot get into the oil, should a leak develop.

Still further objects and advantages of my invention will appear from the following detailed description when taken in connection with the accompanying drawing in which: Y

Figure 1 shows partly in section and partly in elevation a transformer tank having a cooling coil attached in accordance with my invention. Fig. 2 is an enlarged view showing the details of the coupling device shown in Fig. 1. Fig. 3 is a perspective view taken from the rear showing other details of the same coupling device. Fig. 4 is a view similar to Fig. 2 showing a modified form of coupling which may be used in the practice of my invention. Figs. 5 and 6 show further modified forms of couplings.

Referring now to the drawings A10 denotes a tank or casing adapted to house electrical apparatus and to contain the principal cooling medium as, for instance, oil. 11 denotes the cooling coil which is submerged in the oil, and has circulating through it the auxil- 1ary cooling medium as, for instance water. The coil 1l has a generally helical form in order to provide a large cooling surface in the oil and has both its upper and lower ends provided with couplings protruding through openings 12 in the wall of casing l0, which are secured therein in an oil and water tight manner.

To secure the end couplings of the coil 11 in this desired manner, an improved device of the type shown more in detail in Figs. 2 and 3 is employed. An elbow l5 is brazed `or otherwise tightly secured to a coil end, as shown at 16.` The other end of the elbow 15 is threaded to receive the end of an exterior pipe end or nipple, as shown at 17.

The nipple or pipe end 17 has a shoulder 18 formed integrally thereon and supports set screws 19 which force the flanged sleeve 20 to firmly engage the gasket 21 interposed between it and the threaded end ofthe elbow 15. The sleeve 20 fits loosely over the nipple or pipe end 17 so that any water, which may leak from the joint made by the nipple in the elbow, finds free egress through the annular space between the nipple and sleeve to the exterior of the tank 10 without tending to enter the oil space.

The sleeve 20 has screws 22 in its flange 23 arranged to engage with or screw into the boss or collar 24 formed or secured on the tank 10 about the openings 12 in a fluid tight manner. The screws 22 draw the flanged sleeve 20 up against the boss 24 tightly so as to compress the gasket 25 sufliciently to make an oil tight joint. Any leak at this joint permits the oil free egress to exterior of the tank without contact with the water or auxiliary cooling medium.

In order to prevent the -elbows 15 from turning in openings 12, and hence twisting or straining the coil 11, I preferably provide each elbow 15 with proJectlons such as shown at 26 which are adapted to engage in correspondixw recesses 2T formed in the interior end of boss 24 when such elbows are drawn into place.'

It will be observed that the uplper and lower fianged sleeves 20 serve ast e means for securing the coil 11 in place; and that when the nipples 17 and sleeves 20 have been loosened, the coil 11 is removable. The coll 11 is, in consequence, readily secured 1n place or removed without havlng first to be alined or to be bent in place.

The lower end of the coil is preferably the inlet for'the water or auxiliary cooling medium and is provided with a three way valve 30 which serves not only as a means for regulatin the flow of such auxlliary medium but aIso as a drain therefor. 0 D

The exterior upper end of the'coll 31 1s preferably made the highest portion of the coil and 1s rovided with an air inlet vent 32 so that alA water may be drained from the coil when desired. The down-turned ortion 33, serving as the outlet, is '.provlded with a funnel 34 to catch the splash where an open discharge system is employed.

In Fig. 4 I have shown another form of coupling which may be used to accomplish the same result as that shown in Fig. 2. Here the coil end 16 is secured in the elbow 35 which is screwthreaded to receive the pipe end or nipple 17. The threaded end of the elbow 35 1s flanged to receive screws'36 which draw up the wide collar 37 to compress the gasket 38 between them. rI`he wide collar 37 fits loosely about the pipe end or nipple 17 so that any leakage of water will have free egress to the exterior of the tank.

The boss or collar 44 formed about the opening in the tank receives screws 42, also carried by the wide collar 37 and has compressed therebetween the gasket 45 so as to prevent leakage of oil. This collar consequently supports the coil 11 .in the same manner as did the sleeve 20 in the previously described construction.

In Fig. 5 I have shown still another cou'- pling which may be used to accomplish these results in accordance with my invention. Here the coil end 16 is secured in one end of the elbow 55, and in the other end there is in threaded engagement with the elbow the pipe end or nipple 17 Here a flanged sleeve 60 is slipped over the nipple 17 and in this form is secured in place by an external thread 61 on the elbow 55. Since sleeve 60 loosely fits around .y the pipe end 17, any leakage at either of these threaded jomts has free-egressto the i exterior of the tank. The flanged sleeve 60 is drawn up against boss 62, with a -compressed gasket 63 intervening, by means of the screws 64; so that the coil 11"'is here flange 84 on thesleeve 80.

againA supported in substantially the same manner as described in connection with n Fi 6 I have shown still another form of coup ing for accomplishing the purpose of my mvention, but differs from those reviously described principallyin the use o an internal boss on the tank instead of an ex-l which the threaded end of elbow 75 is drawn to compress the gasket 82 when brought into place by the set screws 83 sup orted in the ere again it is seen that any leaka e at the joints has free egress to the exterlor of the tank 10.

Having now described what is at present the best means known to me for carrying out an embodiment of my invention, I would have it understood that such means are merely illustrative and that I do not mean tol be limited thereby to the exact details shown nor in the choice of recognized equivalents except as defined in my claims hereunto appended.

What I claim as new anddesire to secure by Letters Patent of the United States, is,-

1. In casings for oil insulated transformers and the like, the combination with a wall, of a cooling coil adapted to convey a fluid for cooling the oil and provided with end couplings arranged to protrude through said wall, and means for securing said end cou lings in said'wall in a fluid tight manner an arranged to permit free egress of leakage to the exterior of the casin wallwithout intermingling with the o' 2. In casings for transformers and the like, the combination with a wall, of a cooling coil provided with end couplings adapted to protrude through said wall, an

exterior portion of said coil bein made the highest part thereof and provi ed with a vent, and means for securing said end couplings in said wall in a fluid tight manner.

3. In casings for transformers and the like, the combination with a wall, of a cooling coil provided with end couplings adapted to protrude through said wall, and means making independent joints with said wall and with said end couplings for securing said coil in said tank in a iluid tight I na'nner.-

.4. In 'casings for transformers and the like, the combination with a wall, of a cooli"r ig`v .coil provided with end couplings adapted-to protrude through said wall, an

exterior -"portion of said coil being made the highest kpart thereof and provided with a vent, the lowest exterior portion being provided with a drain, and means making independent joints with said wall and with said end couplings for securing said coil in said tank in a fluid tight manner.

5. In casings for transformers and the like, the combination with a wall, of a cooling coil provided withlend couplings adapted to protrude through said wall, an exterior portion of said coil being made the highest part thereof and provided with a vent, the lowest part also being on the exterior of the tank and provided with a combined drain and low regulating device, and means for securing said end couplings to said tank provided with sleeves adapted for `"making -independent joints with said coil and with the tank wall.

6. In casings for oil insulated transformers and the like, the lcombination with a wall having openings therein, of a cooling coil adapted to convey a Huid for cooling the oil and provided with end couplings arranged to protrude through Athe openings in said wall,` and means for securin said coupling ends to said tank provider? with sleeves adlipted for making fluid tight engagement with said coil ends and for holding the same in fluid tight engagement over the tank wall openings.

7. In casings for transformers' and the like, the combination with a wall, of a cooling coil provided with end couplings adapted to protrude through said wall, the exterior parts of said coil being made respectively the highest and lowest parts thereof, the highest part being provided with a vent, the lowest part being provided with a drain, and means associated with said end couplings for securing said coil to said tank comprising sleeves secured in fluid tight engagement on the protruding portions of said end couplings and adapted to be secured in fluid tight engagement over the tank wall openings.

In witness whereof, I have hereunto set my hand this 20th da of August, 1919.

MAT HEW L. ELDER.

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