FR2494889A1 - CARCASS FOR TRANSFORMER - Google Patents

Abstract

THE CASING FOR TRANSFORMER 10 FOLLOWING THE INVENTION INCLUDES, PROJECTING INTO THE INTERIOR, FOR EXAMPLE ON EACH OF TWO OPPOSED WALLS, TWO PARALLEL STICKS 17. ACCORDING TO THE INVENTION, THESE STICKS 17 ARE RIGID, AND, BETWEEN THEM, THE WALL. OF THE TUBULAR BODY OF THE CARCASE 10 HAS AT LEAST ONE RECESS 20, SO THAT, IN SERVICE, WITHIN THE TRANSFORMER 22 CONCERNED, IS FORMED BETWEEN THE SAID RODS 17 AND THE JAMB 13 OF THE MAGNETIC CIRCUIT 14 A VENTILATION CHIMNEY 23 OWN A VENTILATION OF THE ELECTRIC CIRCUIT 12. APPLICATION TO TRANSFORMERS CONTAINING A CASING.

Description

24940:

  The present invention relates generally

transformers.

  As we know, a transformer has globally

  an electrical circuit, which is usually made of copper wire, and a magnetic circuit, which is usually made of steel plates suitably stacked, said electrical circuit

  being wound around at least one leg of said magnetic circuit

  tick. The present invention more specifically targets those transformers in which, for the convenience of

  manufacture, a mandrel, commonly called a carcass, is

  placed between the electrical circuit and the magnetic circuit, said carcass comprising a tubular body, in practice to

  quadrangular cross-section, which is specific to the winding

  ge, outside, of said electrical circuit, and, at the

  in place, inside, the corresponding leg of said cir-

magnetic cooked.

  One of the problems to solve in a general way in the manufacture of transformers that include or not

  such a carcass, is to improve the yield, that is to say

  to reduce losses in service, particularly those

due to the electrical circuit.

  The present invention generally relates to a provision allowing, when a carcass is

  implementation, to take advantage of this carcass for a

loss reduction.

  More specifically, it firstly relates to a transformer casing, of the type comprising a tubular body specific to the winding, to the outside, of an electrical circuit, and to the installation, to the inside, a jamb of

  magnetic circuit, said tubular body having, longitudinally

  dally, projecting inwards, at least two

  parallel tracks, this carcass being characterized in that said rods are rigid, and in that, between them the wall of the tubular body has at least one recess, so that, in use, within the transformer concerned, is formed, between said chopsticks and the jamb of the magnetic circuit, a ventilation chimney suitable for the ventilation of the electric circuit; it also relates to a transformer comprising such a carcass, and therefore within which is formed at least one ventilation duct for

ventilation of the electric circuit.

  Thanks to such a ventilation chimney, the temperature

  in service of the electrical circuit can be lowered significantly.

  The conditions being equal, this lowering

  temperature can reach at least 150.

  Now, as we know, the resistance of copper increases

lie with the temperature.

  So by lowering this one the losses in service are

are diminished.

  It has already been proposed that carcasses for trans-

  trainers whose tubular body presents, protruding towards

  inside, at least two parallel rods.

  But, in the achievements of this type known at this

  Day, it is about flexible sticks, which, extending

  that in relation to the wall which carries them, have the function of ensuring a good maintenance of the relevant leg of the magnetic circuit by substituting itself for the wedges usually provided for this purpose, and which, in use, after installation

  jamb, are thus crushed elastically.

  Thus, they do not form between them any ventilation chimney, the space possibly remaining between them being in any case insufficient to ensure

  any satisfactory air circulation.

  In addition, in these embodiments, no recess is

  provided in the wall of the carcass, so that in any case

  denture, no ventilation of the electrical circuit can be ensured from the remaining space possibly between the rods that has projecting inwardly this wall.

  This is not the case with the carcass following the

  in which the rods used are

  gides, and therefore undeformable, and cooperate, for the circulation

  air, with recesses in the wall that carries them.

  The features and advantages of the invention

  will come out from the following description, as a

  for example, with reference to the attached schematic drawings on

2494 3

  which: Figure 1 is a perspective view of a transformer housing according to the invention; FIG. 2 is, on a larger scale, a partial view partly in elevation, for its half-right, and partly in

  cross-section, for its left half, of a transformation

  carrier comprising a carcass according to the invention.

  Generally, and in a manner known per se,

  the transformer casing 10 according to the invention comprises

  te, as shown in the figures, a tubular body 11 specific to the winding, on the outside, of an electric circuit 12,

  and the placement, inside, of the jamb 13 of a cir-

magnetic cook 14.

  In the exemplary embodiment shown, this tubular body 11 has, transversely, a quadrangular section, for better adaptation to the contour of the leg 13 to be engaged, and at its ends, for a good maintenance of the electrical circuit. 12, it is projecting outwards, from

  one piece with him, two parallel cheeks 15.

  The contour of these cheeks 15 is, in the example of

  represented representation, globally quadrangular, in the image

  of that of the cross section of the tubular body 11.

  On two opposite edges, which are the edges of smaller dimension in the embodiment shown,

  each of the cheeks 15 has a notch 16 in this e-

  xemple embodiment, Longitudinalement, the tubular body 11 has, projecting inwardly, at least two parallel rods 17. In practice, according to the invention, it is about chopsticks

  rigid, that is to say of indeformable rods.

  In the exemplary embodiment shown, two pairs of rods 17 are provided, on two opposite walls of the tubular body 11, which are, in practice, the walls of

smaller dimension.

  These rods 17 extend perpendicular to the walls that carry them, and run longitudinally over any

the height of the tubular body 11.

  At each of their ends they present

  and, as depicted, a chamfer 18.

  In the exemplary embodiment shown, the two

  rails 17 protruding from a wall of the tubular body 11 are each respectively in the extension of the rods 17 projecting on the opposite wall of the tubular body 11.

  Furthermore, and according to the invention, between two

  spacecraft 17 of the same wall of the tubular body 11, said

  King of this tubular body 11 has at least one recess 20. In practice, in the embodiment shown, two such recesses 20 are provided in the extension.

  one of the other on the same wall of the tubular body 11, each

  each of these recesses 20 being lengthened in a buttonhole along

  of the latter, on all the available width between the

corresponding 20 tracks.

  Thus, each wall of the tubular body 10 carrying two rods 17 is, between these rods 17, mostly hollowed out.

  In the usual way, for the constitution of a tranforma-

  the electric circuit 12 to be wound on the tubular body

  11, outside of it, is in copper wire ..

  Similarly, the magnetic circuit 14 to be implemented

  is in steel stack suitably stacked.

  In practice, the plates of the corresponding stack extend perpendicularly to the rods 17 of the carcass 10.

  As will be understood, chamfers 18 of these

  17 payday loans make it easier to set up

  carcass 10, of the leg 13 of such a magnetic circuit 14.

  If necessary, shims are implemented between the rods 17 and the leg 13 to ensure proper maintenance of

this last.

  In use, and thanks to the invention, it is formed within the transformer 21 thus constituted, between each pair of rods 17, on the one hand, and the leg 13 of the magnetic circuit 14, on the other hand, a chimney ventilation 23, which runs over the entire height of the carcass 10, and whose cross section is well determined and dimensionally stable.

  because of the rigidity of said rods 17.

  2494e: By the recesses 20 provided between the rods 17, such a ventilation chimney 23 is able to ensure a

  suitable ventilation of the electrical circuit 12, for cooling

of this one.

  Of course, the present invention is not limited to the embodiment described and shown, but encompasses

any variant of execution.

2494u39

Claims (8)

  1) transformer body, of the kind comprising a tubular body specific to the winding, to the outside, of an electrical circuit, and to the establishment, inside, of a magnetic circuit leg, said tubular body having at least two parallel rods protruding longitudinally inwardly, characterized in that said rods are rigid and in that between them the wall of the tubular body has at least one recess, that, in service, within the processor concerned,   formed between these rods and the jamb of the cir-   magnetic stove, a ventilation chimney suitable for ventilation electrical circuit.   2) Transformer housing according to the claim   1, characterized in that, at their ends, the said chopsticks have a chamfer.   3) Transformer casing according to any one   claims 1, 2, characterized in that the   gules extend perpendicular to the wall door.   4) Transformer housing according to any one of   Claims 1 to 3, wherein the tubular body is   with quadrangular cross-section, characterized in that two rods are provided on two opposite walls of said tubular body.) Carcass for a transformer according to claim   4, characterized in that the opposite walls of the tubular body   two sticks are the walls of smaller dimensions.   6) Transformer housing according to any one   claims 1 to 5, characterized in that the   between two rods extends over the entire width available between them.   7) Transformer housing of any one   claims 1 to 6, characterized in that the   between two chopsticks is lengthened in a buttonhole along of the wall that it affects.   8) Transformer casing according to any one   than claims 1 to 7, characterized in that between 24948 '   two rods are provided with at least two recesses, in the extension of one another.   9) Transformer housing according to any one   Claims 1 to 8, characterized in that the wall   the tubular body is, between two rods, mostly hollowed out.   ) Transformer of the kind comprising an electric circuit   caged on a carcass in which the jam is engaged   magnetic circuit, characterized in that said cartridge   breakage according to any one of claims 1 to 9.