US2571418A

US2571418A - Transformer coil spacer

Info

Publication number: US2571418A
Application number: US82189A
Authority: US
Inventors: Castenschiold Rene
Original assignee: AMERICAN TRANSFORMER CO
Current assignee: AMERICAN TRANSFORMER Co
Priority date: 1949-03-17
Filing date: 1949-03-17
Publication date: 1951-10-16
Anticipated expiration: 1968-10-16

Description

R. CASTENSCHIOLD TRANSFORMER COIL SPACER Filed March 17, 1949 FIG '7 INVENTOR RENE CA6 TENJCH/OLD BY Z in I a VII/lIl/l/Anfll Oct. 16, 1951 Patented Oct. 16, 1951 TRANSFORMER con. SPACER Ren Castenschiold, Morristown, N. 1., assignor to American Transformer Newark, N. J.-

Application March 17, 194' 9', S'erialNo. 82,189

1 Claim. (01. 175-362) This invention relates to a spacer device for separating and supporting the coils of high voltage transformers. In certain types of these transformers the high voltage winding usually consists of a number of individual coils which are wound up separately and then stacked around the low voltage winding of the transformers after which the high voltage coils are connected in series. In this assembly operation, it is necessary to keep the coils separated in order that they may be properly insulated and cooled during operation.

Heretofore, the different assembly operations of these soils consumed-Va lot of time and hence ran up the expense as will be hereinafter pointed out in more detail.

After having studied this assembly problem, and observed the time consumed in the assembly of the high voltage winding I have discovered much cheaper and better means of assembly, so it is the principal object of this invention to provide an entirely new and improved means of assembly whereby the following advantages are obtained.

1. Reduction of labor in the assembly of the coils.

2. Elimination of some materials.

3. Use of spacers that are relatively inexpensive which produce a much better and more satisfactory assembly operation and at the same time giving an improved appearance.

4. A spacer device which can be used on practically all types of transformers employing disc coils.

These objects as well as others will be apparent as the description proceeds.

In the drawing,

Figure 1 is a plan view of the two coils which may be considered as a unit.

Figure 2 is a side view of Figure 1.

Figure 3 is a plan view looking down on the top of an assembled transformer without its casing.

Figure 4 is a side elevational View showing the assembly of the coils into operative position.

Figure 5 is an enlarged sectional view from the line 5--5 of Figure 3.

Figure 6 is a plan view of my new coil spacer device.

Figure 7 is a side view of Figure 6, while Figure 8 is a view similar to Figure 5 but showing an old and tedious method of assembly of the coils on the transformer. In the various views, wherein like numbers refer to corresponding parts, I shows a coil made up of a plurality ofturn's ofrectangul'arly shaped wire. As shown in Figures 1 and 2; the coil I may be anchored toan adjacent coil 2 by using a relatively thin' insulating collar 3 between the two coils" and binding them together with a plurality of ties 4' of suitable adhesive tape. When a pair of such coils are assembled as shown in Figure 2, they are ready to be assembled into the transformer as shown in Figure 4. The first coil to be assembled is passed over a tube 5 of insulating material which is used to separate the primary and secondary windings. After the coil is passed downwardly on the tube 5, it engages insulating supports 6' which rest on a member 1. Then a plurality of devices 8 as shown in Figures 6 and 7 are arcuately positioned around the tube 5 as shown in Figure 3. The spacers 8 as shown in Figures 6 and '7 are T-shaped, the stem portion having a cross head 9 giving the spacer the shape of a T. The head or cross bar 9 of the T passes between the inner turn [0 of the coil and the tube 5, being closely adjacent to the tube. The length of the spacer is such that it extends preferably a distance beyond the outer turn of the coil as shown in Figure 3, while its width is such as to furnish a substantial area for supporting the next coil that is placed in position over the tube 5 as is best shown in Figure 5 wherein it is seen that the two projecting parts of the cross bar engage the inner edges of the two coil units. Since the coils l and 2 are bound together as has been described, an L-shaped spacer might be used but I prefer the T shape because in most applications the T shape spacer assists in properly loeating the coils and hence permits quicker and easier stacking. Should more than one pair comprising a unit as shown in Figures 1 and 2 be stacked around the tube 5, as shown in Figure 3, the T-shaped spacer will provide better holding of the coils as compared With an L- shaped spacer.

It is to be observed from Figures 3 and 5 that the coil spacers can be very quickly dropped into place and are automatically held in position by the coils as they are stacked around tube 5. The spacers cannot shift arcuately on the coils because of the close relation of the head 9 to the tube 5 and the angularity of the winding. Furthermore, after the coils have all been assembled the entire primary and secondary windings are treated with suitable varnish. A great advantage of this new coil spacer should be apparent by referring to Figure 8 wherein according to the old practice a strip of tape l0 had to be pulled through the coils and around the coil spacers II which were merely stripsof insulating material that had to be held with one hand while the operator was pulling the tape in and around them. Since the tape had to be unwrapped, this was a slow and tedious operation. Furthermore, the vertical duct spacer I 2 had to be utilized together with a separate insulating Washer l3 between two adjacent layers of coils. Since the spacers ll must be in position when the tape is pulled through, the duct spacers [2 had to be assembled before the coils were put in place to properly position the spacers ll, consequently, with the vertical duct spacers I2, in position, the coils could not be assembled around the tube 5 as quickly as in the new method of procedure, wherein the vertical duct spacers l2 are eliminated and thus permitting greater clearance in stacking the disc coils around the tube 5.

Furthermore, the vertical duct spacers interfere with the flow -.of cooling fluid whether it be air or oil, so that the use of this new spacer which eliminates the vertical duct spacer permits much better ventilating and cooling.

This new T- or L-shaped coil spacer is relatively cheap to make and can be made of materials such as steatite or glass which can be used in all types of transformers requiring disc coils. They can also be made of other suitable materials which might be prefered for only certain types of transformers.

' I claim:

In a transformer of the type having a primary winding and a secondary high voltage winding sub-divided into a plurality of coils, the primary and secondary windings being separated by an insulating tube, means for spacing the high voltage coils comprising, a plurality of single piece T shaped devices of suitable insulating material, each having a body portion positioned between different coils, the length of the body portion being at least equal to the radial depth of said coils and of a suitable thickness so as to permit proper insulation and cooling between the high voltage coils in the transformer, each device having a uniform width to give considerable supporting area to the engaged coils, the device having a single cross head at one end extending on both sides of the body portion to engage different adjacent coils at their inner periphery, said cross head coming in close proximity to the outer surface of said tube for the purupose described.

RENE CASTENSCHIOLD.

REFERENCES CITED The following references are of record in the file 'of this patent:

UNITED STATES PATENTS Beymer Apr. 19, 1949