FR2736199A1 - CARCASS FOR A TRANSFORMER, AND TRANSFORMER COMPRISING SUCH A CARCASS - Google Patents

Abstract

This is a transformer whose casing (10) comprises terminal block pads (16A, 16B) each specific to establishing a connection terminal (17A, 17B), with, in engagement with one at least of these terminal block pads (16A, 16B), for the constitution of such a connection terminal (17A, 17B), a terminal (24A, 24B) comprising internal connection means (25A, 25B) for connection an electric wire wound on its channel (14). According to the invention, the terminal (24A, 24B) integrally associates with its internal connection means (25A, 25B) external connection means (26), for the direct connection, by itself, of an electrical conductor specific to serving the transformer. Application to transformers.

Description

"Carcass for transformer, and transformer including such

  The present invention relates generally to

transformers.

  It relates more particularly to those transformers which comprise a carcass of insulating material, and more specifically, synthetic material, on the tubular part, commonly called gutter, of which are wound the son constituting the primary and secondary, and pads terminals, which are carried by this carcass, to at least one of the ends thereof, and which are

  each specific to the establishment of a connection terminal.

  In practice, two types of connection must be

  provided by these connection terminals.

  First there is an internal connection, for the connection, in the workshop, of the electric wires wound on the

gutter of the carcass.

  There is, then, an external connection, made in situ, by the user of the transformer, for the connection of the electrical conductors necessary for the service of this transformer. In some embodiments, the terminal block pads are initially equipped with simple pods, for example "FASTON" type pods, exclusively comprising means

internal connection.

  It is therefore necessary, after the winding of the electrical wires and their connection to these lugs, to carry out a particular recovery operation, which consists in reporting, on the terminal block pads, connection blocks, which, each engaging respectively, with these pods, they have the

  external connection means required.

  In other embodiments, terminal block pads specific to the internal connection and the external connection are only reported on the carcass after winding of the wires.

  electric, so as not to interfere with this winding.

  It is therefore necessary, as before, to carry out a particular recovery operation after this winding, for

  ensure the internal connection of the coiled wires.

  In other embodiments, again, the terminal blocks are integrated from the beginning to the carcass, but the establishment of lugs can be made only after winding

electric wires.

  It is therefore also necessary, after this winding, to carry out a particular recovery operation, for the

  internal connection of the coiled wires.

  The present invention generally relates to a provision making it possible to avoid such an operation

of recovery.

  More specifically, it firstly relates to a transformer carcass of the kind comprising terminal blocks each specific to the establishment of a connection terminal, with, engaged with at least one of these pads terminal block, for the constitution of such a connection terminal, a lug having internal connection means, for connecting a wire wound on its gutter, this carcass being generally characterized in that this lug associates, in one piece, with these means of internal connection, means of

  external connection, for the direct connection, by

  same, of a clean electrical conductor serving the transformer. In other words, according to the invention, the carcass is equipped from the outset clean lugs both the internal connection of the wound son and the connection

  external of the transformer at the user of it.

  Thus, from the winding, it is possible to proceed continuously to the internal connection of the wound son, without any subsequent recovery operation is necessary, either to ensure this internal connection, or to set up any components necessary for connection

subsequent external.

  Another subject of the present invention is any transformer whose carcass is thus equipped from the very beginning with lugs that are clean both for its internal connection and for its

external connection.

  The objects of the invention, their characteristics and

  their advantages, will emerge from the description which

  By way of example, reference will be made to the accompanying diagrammatic drawings in which: FIG. 1 is a perspective view of a transformer carcass according to the invention, seen from a first side, along the arrow I of FIG. Figure 2, and with, exploded, one of the connection terminals which it is likely to be equipped; Figure 2 is another perspective view of the carcass, seen from the opposite side to the previous, along the arrow II of Figure 1; Figure 3 is a larger scale, a partial longitudinal sectional view, along the line III-III of Figure 1, with an exploded view in longitudinal section of the terminal that comprises according to the invention a terminal of connection; Figure 4 is a partial view in longitudinal section similar to that of Figure 3, pod in place; Figure 5 is another partial longitudinal sectional view of the carcass according to the invention, along the line V-V of Figure 1; Figure 6 is a perspective view of the pod shown in longitudinal section in Figures 3 and 4, seen from the rear; Figure 7 is a perspective view of this pod, seen from the front; Figures 8, 9 are perspective views which, like each, respectively in Figures 6, 7, relate to another pod; Figure 10 is a larger scale, a partial cross-sectional view of the other lug along the line X-X of Figure 9, before crimping a wound wire; Figure 11 is a partial cross-sectional view similar to that of Figure 10, after this crimping; FIG. 12 is a side view of a transformer comprising a carcass according to the invention, this side view corresponding, for the latter, to the arrow XII of FIG.

figure 1.

  As illustrated in these figures, the carcass 10 according to the invention is intended for the constitution of a transformer 11 having, on the whole, firstly, at least two electrical son 12A, 12B wound on this frame 10, for the realization of his primary and secondary education, and

  on the other hand, a magnetic circuit 13.

  The carcass 10, which is made of insulating material, and, more specifically, of synthetic material, for example by molding, comprises, on the whole, and in one piece, on the one hand, a channel 14, c that is to say a tubular piece, which is intended to receive, by winding, the electrical son 12A, 12B, and which is suitable for the engagement of the central leg, not individualized in the figures, of the magnetic circuit 13, and on the other hand, at the ends of this channel 14, for the confinement of the electrical wires 12A, 12B wound thereon, two cheeks 15 which, parallel to each other, are

  perpendicular to the generatrices of the gutter 14.

  In the embodiment shown, the section

  transverse of the channel 14 is generally rectangular.

  Like this cross section, the cheeks 15

  themselves have a generally rectangular outline.

  In one piece with the carcass 10 are provided block terminals 16A, 16B each specific to the establishment

a connection terminal 17A, 17B.

  In practice, these terminal block pads 16A, 16B are

  arranged in at least one row.

  In the embodiment shown, they are arranged in two rows, which intervene, each respectively, facing one another, at the ends of the channel 14, one of these rows comprising the terminal pads 16A intended for internal and external connections of the primary of the transformer 11, the other comprising the terminal pads 16B for the internal and external connections of

his secondary.

  For each row, the terminal block pads 16A, 16B protrude from a bracket 18 which locally extends the gutter

  14 beyond the corresponding cheek.

  Within each row, the terminal pads 16A, 16B are separated in pairs by slots 20 for the passage of the ends of the corresponding wire 12A, 12B. At one end of each of the rows, two slots 20 are twinned, being separated from each other by

a partition 21.

  One of the slots 20 thus twinned is associated with the terminal strip terminal block 16A, 16B, while the other is

  associated with the adjacent terminal block 16A, 16B.

  This arrangement, which falls within the scope of the invention, makes it possible both to prevent the electrical wire to which the terminal block terminal block 16A, 16B can correspond from passing to the outside of the carcass at the risk of departing from the core of the assembly and to raise insulation problems, and, at the same time, that it does not pass in the same slot 20 than that in which the electrical wire to which the terminal block 16A may correspond, 16B adjacent, at risk, again, to raise an isolation problem between

  the two electric wires then concerned.

  Due to the dissymmetry that it generates in the alignment of the terminal blocks 16A, 16B of each row, the pairing of two slots 20 can also advantageously serve as a polarization. It also makes it possible to visually isolate one of these terminal block pads 16A, 16B, in this case the terminal strip terminal block 16A, 16B, and, if desired, this terminal strip terminal block 16A, 16B may be advantage for the establishment of a particular connection terminal 17A, 17B, for example a terminal of

17A connection, 17B mass.

  The terminal pads 16A, 16B of the two rows are generally similar to each other, and they each have a generally parallelepipedal overall outward contour, all of which are flush at the same level on their upper surface, and each being affected by an indentation 19 to their lower part. But, according to the invention, at least some of them are flanked laterally, on one side, at the edge of the slot 20 which is associated with them, by a partition 22 which extends

to the bottom of this slot 20.

  In the embodiment shown, only the terminal block pads 16A of one of the rows are thus each

  flanked laterally by a partition 22.

  This is in practice the terminal blocks

  corresponding to the electrical wire 12A wound first.

  In the embodiment shown, and as best seen for one of them in FIG. 5, the bottom of the slots 20 extends obliquely away from the

  console 18 as it moves away from the gutter 14.

  In the embodiments shown, the pads

  16A, 16B are five in each row.

  But it goes without saying that this number should not be

  considered as limiting the invention.

  In Figures 1 and 2, and not to overload them, only one of the terminal pads 16A, 16B of each row has been shown equipped with a connection terminal 17A, 17B. But it goes without saying that others are also likely to be equipped with such a connection terminal 17A,

17B.

  For the constitution of a connection terminal 17A, 17B, it is implemented, engaged with the corresponding terminal block 16A, 16B, a terminal 24A, 24B having, in accordance with arrangements described in more detail later, means for internal connection 25A, 25B, for connection

  corresponding electrical wire 12A, 12B.

  According to the invention, this lug 24A, 24B associates, in one piece, with these internal connection means 25A, B, external connection means 26, for the direct connection, by itself, of an electrical conductor 27A, 27B suitable for serving the transformer 11, such as

  schematized in broken lines in Figure 12.

  In the embodiment shown, a lug 24A, 24B is in the general shape of an inverted U, and, overall,

  it covers the terminal block 16A, 16B concerned.

  This lug 24A, 24B thus has a first leg 28, by which, in practice, it is force-fitted into a housing 29 provided for this purpose, hollow, in the form of a pocket, on the terminal block 16A, 16B that it equips, at the rear of the latter, a median part 30, which extends on this terminal block pad 16A, 16B, and with the aid of which intervene the external connection means 26, and a second leg 32, which is leaned against the terminal block 16A, 16B, and which includes the

  internal connection means 25A, 25B.

  In practice, in the embodiment shown, the first leg 28 has a width less than that of the

middle part 30.

  For his anchoring in the dwelling 29 in which he

is fitted, it is notched.

  In the embodiment shown, it presents, laterally, on each of its slices, at least one notch

  asymmetrical 31, in the manner of a harpoon.

  In practice, several dissymmetrical notches 31 are

  staggered in height on each of these slices.

  In the embodiment shown, the second leg 32 has, overall, a height greater than that of the first leg 28, and it comprises, successively, starting from the middle portion 30, two sections, namely, a first section 32 ' , which, of height substantially equal to that of the first leg 28, extends over the entire width of the middle part 30, and which is generally straight, and a second section 32 ", which, of less width than the previous one, gradually departs from it, forming

  end a return 33 globally directed outward.

  The internal connection means 25A, 25B

  intervene at the end of this return 33.

  Preferably, and as represented, for the arc-

  24A, 24B terminal of the lug on the terminal block 16A, 16B it equips, it is provided latching means between its second leg 32 and the terminal block 16A, 16B, not included

  the fitting of the first leg 28.

  In practice, in the embodiment shown, these latching means comprise an elastically deformable tab 34, which, coming from a single piece of the second leg 32, and, more precisely, of the section 32 'of this second leg 32, in favor of a puncture 35 thereof, extends obliquely towards the middle portion 30, on the inner face of the leg 32, and which is caught on a shoulder 34 'provided for this purpose

  on the associated terminal block 16A, 16B.

  When the electric winding wire is a relatively thin wire, and therefore flexible, and this is the case for the electrical wire 12A of the primary of the transformer 11 in the embodiment shown, the internal connection means 25A of a terminal 24A are for example constituted by a simple pin clean winding such a wire

  12A, as schematized in broken lines in FIG. 7.

  These internal connection means 25A then extend generally longitudinally relative to the second leg 32 of the terminal 24A, towards the middle portion

of it.

  When the electric winding wire is a relatively thick wire, and therefore relatively rigid, and this is the case for the secondary electrical wire 12B of the transformer 11 in the embodiment shown, the internal connection means 25B of the terminal 24B can for example be constituted by a simple clean hook to the pinch of such an electrical wire 12B, as shown on

Figure 11.

  These internal connection means 25B then extend generally transversely relative to the second leg 32 of the terminal 24B, and, initially, to facilitate the introduction of the wire 12B, the hook they form

  is broadly open in V, as shown in FIG.

  At the same time, the external connection means 26 of a lug 24A, 24B comprise, indifferently, on the median part 30 of such a lug 24A, 24B, whether it is a lug 24A associated with the terminal pads 16A. or whether it is a lug 24B associated with the terminal pads 16B, a tapped hole 36, prolonged in practice with the aid of a trimming 37, on the lower surface of this middle part 30, for the reception of a screw 38 suitable for tightening the driver

electric 27A, 27B to be connected.

  Preferably, and this is the case in the embodiment shown, they comprise, in addition, a clamping plate 39, which, intended to be inserted under the head of the screw 38, is pierced with a hole 40 for the passage

the barrel of it.

  For the movement of such a screw 38, the terminal block pads 16A, 16B have hollow on their upper face

a recess 42.

  This is, in practice, a blind recess.

  The lugs 24A, 24B are placed on the carcass 10 even before the winding of the electrical wires 12A, 12B on the channel 14 thereof, their anchoring on this carcass 10 allowing them to withstand the centrifugal force.

  to which they are subjected during this winding.

  At the end of the winding of each of the electrical wires 12A, 12B, and in continuity with this winding, it is proceeded to

  internal connection of these electrical son 12A, 12B.

  For the electrical wire 12A, which is in practice wound first, this internal connection is, as indicated above, by winding, or "wrapping", after bypassing the partition 22 corresponding, as

shown in Figure 12.

  For the electric wire 12B, and as also indicated above, it is done by pinching, as shown on

Figure 12.

  In either case, the winding, or nip, is followed later by welding.

  It is then proceeded to the establishment of clamping plates 39 and screws 38 for the completion of the transformer 11. Of course, the present invention is not limited to

  to the embodiment described and shown, but encompasses any variant embodiment.

he

Claims (16)

  Transformer casing, of the type comprising terminal block pads (16A, 16B), each adapted to the establishment of a connection terminal (17A, 17B), in engagement with at least one of these pads. terminal block (16A, 16B), for the constitution of such a connection terminal (17A, 17B), a terminal (24A, 24B) having internal connection means (25A, 25B) for connecting an electric wire ( 12A, 12B) wound on its channel (14), characterized in that the lug (24A, 24B) associates, in one piece, to these internal connection means (25A, 25B), external connection means (26). ), for the direct connection, by itself, of an electrical conductor (27A, 27B) suitable for serving the corresponding transformer (11).   2. Carcass according to claim 1, characterized in that the internal connecting means (25A) of a terminal (24A) are constituted by a single pin peculiar to   winding the electrical wire (12A) to be connected.   3. Carcass according to claim 1, characterized in that the internal connecting means (25B) of a lug (24B) are constituted by a simple hook specific to a   pinching of the electrical wire (12B) to be connected.   4. Carcass according to any one of   Claims 1 to 3, characterized in that the means for   external connection (26) of a lug (24A, 24B) has a tapped hole (36) for receiving a screw (38) which is   clamping the electrical conductor (27A, 27B) to be connected.   5. Carcass according to claim 4, characterized in that the external connection means (26) of a terminal   (24A, 24B) further comprise a clamping plate (39).   6. Carcass according to any one of   Claims 1 to 5, characterized in that in general form   U reversed, a lug (24A, 24B) has a first leg (28), by which it is force-fitted in a housing (29) provided for this purpose recessed on the terminal block (16A, 16B) that it equips, at the rear of the latter, a median portion (30), which extends on this terminal pad (16A, 16B), and with the aid of which intervene its external connection means (26), and a second leg (32), which is leaned against the terminal block (16A, 16B), and which includes its   internal connection means (25A, 25B).   7. Carcass according to claim 6, characterized in that the internal connection means (25A, 25B) of a lug (24A, 24B) intervene at the end of a return (33) of its second leg (32). globally outward oriented. 8. Carcass according to claim 7, characterized in that, being a pin, the internal connection means (25A) of a lug (24A) extend generally longitudinally with respect to its second leg (32). , in   direction of its middle part (30).   9. Carcass according to claim 7, characterized in that, in the case of a hook, the internal connection means (25B) of a lug (24B) extend globally.   transversely to its second leg (32).   10. Carcass according to any one of   Claims 6 to 9, characterized in that the second   jamb (32) of a pod (24A, 24B) generally has a height   greater than that of its first leg (28).   11. Carcass according to any one of   Claims 6 to 10, characterized in that for its anchoring   in the housing (29) in which it is fitted, the first   jamb (28) of a lug (24A, 24B) is notched.   12. Carcass according to any one of   claims 6 to 11, characterized in that for   the bracing of a terminal (24A, 24B) on the terminal block (16A, 16B) that it equips, there are provided latching means (34, 34 ') between its second leg (32) And this terminal block stud (16A, 16B).   13. Carcass according to any one of   Claims 1 to 12, characterized in that the pads of   terminal block (16A, 16B) being arranged in at least one row, being separated two by two by slots (20), at least some of which are flanked laterally by a partition   (22) extending to the bottom of the corresponding slot (20).   14. Carcass according to claim 13, characterized in that, the terminal block pads (16A, 16B) being arranged in two rows, which each intervene respectively at the ends of the channel (14), only the terminal block pads (16A) of one of these rows are flanked laterally by a partition (22).   15. Carcass according to any one of   Claims 1 to 14, characterized in that, the pads of   terminal block (16A, 16B) being arranged in at least one row, being separated two by two by slots (20), two slots   (20) are twinned at one end of such a row.   16. Transformer on the carcass (10) of which are wound at least two electrical son (12A, 12B), characterized in that the carcass (10) is in accordance with any of Claims 1 to 15.