JPH0451506A - Through-type current transformer - Google Patents

Abstract

PURPOSE:To do secure and stable fixation and improve heat radiation of a current transformer body and simplify structure thereby reducing the cost by bending a primary conductor in U-shape along the transformer body via the square groove of a spacer and the groove of a holder, and extending each foot of this U-shaped conductor outward. CONSTITUTION:A primary conductor 5 is bent in U-shape and is made to pierce the hollow of a transformer body 3, and the transformer body 3 in this condition is placed on one side of a mounting plate 1 through a spacer 2. What is more, one foot of the primary conductor 5 is inserted into the square groove 2a of the spacer 2, and is held by it. Next, a holder 4 is put in the hollow of the transformer body 3, whereby the U-shaped bottom of the primary conductor 5 is set in the groove 4a and is held by it. Lastly, the mounting plate 1, the spacer 2, the transformer body 3, and the holder 4 are fastened integrally by means of a screw 6.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a through-type transformer having a structure in which a primary conductor is passed through a hollow portion of a toroidal transformer main body, each end of which is bent into a U-shape and drawn out to the outside.

[Conventional technology]

One conventional example will be described with reference to FIG. 6, which is a perspective view thereof. In the figure, an annular transformer main body 22
is placed in contact with one surface of the mounting plate 21. The primary conductor 23 passes through the hollow portion of the transformer body 22 and is bent into a U-shape. Each leg of the U-shape passes through and is held by the mounting plate 21, and the transformer main body 22 is fixed to the mounting plate 21. Another conventional example will be described with reference to FIG. 7, which is a perspective view thereof. In the figure, an annular transformer main body 3
2 is embedded in the mold 31. A through hole 33 is formed in the center of the mold 31 so as to pass through the hollow portion of the transformer main body 32, and a primary conductor (not shown) is inserted through the through hole 33 and attached thereto. Two mounting screw holes 34 are provided on one side of the mold 31.

[Question B that the invention attempts to solve]

As explained above, - In the conventional example, the structure is very simple. However, when holding the primary conductor, there is a risk that unreasonable force will be applied to it. On the other hand, if excessive force is not applied, the primary conductor will not be held completely to the mounting plate, which will cause another problem. Furthermore, since the transformer body and the primary conductor are located on both sides of the mounting plate, it is inconvenient to perform overall installation. In another conventional example, the installation method is particularly simple, but since it is embedded in the mold, the cost increases.
It has the disadvantage of being large in size, and since it is embedded in a mold, heat dissipation from the transformer body is poor, and there is a risk of deterioration due to temperature rise. The object of this invention is to solve the problems of the prior art and to hold the primary conductor passing through the hollow part of the transformer body without applying excessive force to it. An object of the present invention is to provide an improved feedthrough transformer which has good heat dissipation and is realized by a simple structure.

[Means to solve the problem]

In order to solve this problem, the feedthrough transformer according to the first invention has the following features: A rectangular groove in which a part of the primary conductor is inserted and held in the length direction is formed in one direction, and the bottom of the rectangular groove is a plate-shaped spacer having a screw through hole in the vicinity and placed in contact with one surface of a mounting plate; an annular transformer main body placed in contact with a surface of the spacer on the opposite side from the mounting plate; A groove in the outer peripheral surface in which another part of the primary conductor is inserted and held in the longitudinal direction is formed in the axial direction, a screw hole is provided in the center that coincides with the axis, and a hollow part of the transformer main body is formed. a rotating body-shaped holder that is inserted into and locked in the spacer; is fastened with screws so that the grooves of the holder correspond to the square grooves of the spacer, and the primary conductor is connected to the spacer. It is bent into a U-shape along the surface of the transformer body through the square groove of the spacer and the groove of the holder, and each leg of the U-shape extends outward. A through-type transformer according to a second aspect of the present invention includes: an annular transformer main body placed in contact with one surface of a mounting plate; and a ring-shaped transformer main body that is fitted into an opening on the opposite side of the mounting plate in a hollow part of the transformer main body. and a rotating body-shaped holder having a screw through hole in the center that coincides with the axis line; and the holder is screwed by a conductive rod-shaped screw body that is penetrated along each axis of the transformer main body. A primary conductor is connected to each end on both sides of this threaded body so as to extend in the same direction along each surface of the mounting plate and the holder.

[Effect]

In the feedthrough transformer according to the first invention, the primary conductor is
It is bent into a U-shape along the surface of the transformer body through the square groove of the spacer and the groove of the holder, so that it passes through the hollow part of the transformer and the parts on each side become the legs of the U-shape. It becomes a shape that extends outward. In the feedthrough transformer according to the second aspect of the invention, each primary conductor is connected to each end on both sides of the screw body so as to extend in the same direction along each surface of the mounting plate and the holder. It forms a U-shape together with the threaded body that passes through the hollow part of the transformer.

【Example】

An embodiment of the feedthrough transformer according to the first invention (hereinafter referred to as the first embodiment) will be described below with reference to the drawings. FIG. 1 is a side sectional view of the first embodiment. In the same figure,
1 is a mounting plate, 2 is a disc-shaped spacer, 3 is an annular transformer main body, 4 is a holder almost in the shape of a top, 5 is a primary conductor, 6
is a screw. Figure 2 relates to the spacer 2, and Figure (a) is its front view;
Figure (b) is also a side sectional view thereof. In the figure, the spacer 2 is disk-shaped and has a hole 2b in the center and a rectangular groove 2a having a bottom and extending in the radial direction near the hole 2b. FIG. 3 relates to the holder 4, and FIG. 3(a) is a front view thereof, and FIG. 3(b) is a side sectional view thereof. In the same figure,
The holder 3 is almost shaped like a top, and has a bottomed screw hole 4 in the center.
b, and a groove 4a in the axial direction of the outer peripheral surface. Returning to FIG. 1, in this first embodiment, the primary conductor 5 is bent into a U-shape and passed through the hollow part of the transformer body 3, and the transformer body 3 in this state is attached via the spacer 2. Place it on one side of board 1. At this time, the rectangular groove 2 of the spacer 2
Insert and hold one of the legs of the primary conductor 5 in a. Next, the holder 4 is inserted into the hollow part of the transformer main body 3, and the U-shaped bottom of the primary conductor 5 is inserted into the groove 4a and held there. Finally, screw the mounting plate 1. Spacer 2
．． The transformer main body 3 and the holder 4 are integrally fastened. Therefore, it is possible to hold the primary conductor 5 without applying excessive force to it, and it is possible to securely and stably fix the primary conductor 5 as a whole. Moreover, since the transformer main body 3 and the primary conductor 5 can be arranged on one side of the mounting plate 1, handling is convenient. Of course, the heat dissipation of the transformer body 3 is also good. Also, mounting plate 1
By using a conductive material, it is possible to provide an electromagnetic shielding effect for the transformer main body 3 and the primary conductor 5. An embodiment of the feedthrough transformer according to the second invention (hereinafter referred to as the second embodiment) will be described below with reference to the drawings. FIG. 4 is a side sectional view of the second embodiment. In the figure, 11 is a mounting plate, 13 is an annular transformer main body, and 14 is a mounting plate.
is a rotating body-shaped holder, 15 is a primary conductor, and 16 is a primary conductor 1
A crimp terminal is fixed to the end of 5, 17 is a screw, and 18 is a nut. Mounting plate 11. Transformer body 13. The holder 14 is integrally fastened with a screw 17 passed through the holder 14 and a corresponding nut 18. In addition, at the time of this fastening, the primary conductor 15 is connected to the crimp terminal between the stepped part of the head of the screw 17 and the surface of the mounting plate 11, and between the surface of the holder 14 and the nut I8. Insert 4 through 16 and fix. Figure 5 is a rear view of the center of the second embodiment (view from the left side)
This shows that the crimp terminal 16 of the primary conductor 15 is fixed at the head of the screw. Here, by each of the left and right primary conductors 15 and the screw 17,
One complete U-shaped conductor passing through the hollow part of the transformer body 13 is constructed. In that sense, each primary conductor 15
Although it is called a primary conductor, its role is that of the parts that make up the primary conductor. In the second embodiment, each primary conductor 15 can be securely fixed without applying excessive force. In addition, since the transformer main body 13 only needs to have a screw thread inserted through its hollow portion, the transformer main body 13 can be made smaller. Of course, heat dissipation is also good.

【Effect of the invention】

As explained above, in the first invention, the primary conductor is bent into a U-shape along the surface of the transformer main body through the rectangular groove of the spacer and the groove of the holder. The parts on each side become the legs of a U-shape and extend outward, so that no unreasonable force is applied to the conductor, and it is securely and stably fixed. ■ Good heat dissipation from the transformer body; ■ Simple structure and cost reduction;
■Although each component is placed on one side of the mounting plate, it is convenient for handling.■Especially if the mounting plate is made of a conductor, the transformer body and the primary conductor are located on one side of the mounting plate. ,
It has excellent effects such as □ which has an electromagnetic shielding effect against these. In the second invention, the primary conductor is provided at each end on both sides of the screw body.
■, ■, and ■ in the first invention because they are connected in a manner extending in the same direction along each surface of the mounting plate and the holder, and form a U-shape together with the screw body passing through the hollow part of the transformer. In addition to the same effect, there is also the effect that (1) the transformer body can be made smaller, and the transformer as a whole can save space.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an embodiment according to the first invention, FIG. 2 is a spacer in this embodiment, FIG. 1A is a front view thereof, FIG. The figures relate to the holder in this embodiment; FIG. 4(a) is a rear view thereof, FIG. 6 is a perspective view of one conventional example, and FIG. 7 is a perspective view of another conventional example. Symbol explanation 1: Mounting plate, 2 spacer, 2a: square groove, 2b two holes, 3: transformer body, 4: holder, 4a: groove, 4b
: Screw hole, 5: Primary conductor, 6: Screw, 11: Mounting plate, 1
3: Transformer body, 14: Holder, 15: Primary conductor, 16
: Crimp terminal, Figure 2 (a) (b)

Claims (1)

[Scope of Claims] 1) A rectangular groove into which a part of the primary conductor is inserted and held in the length direction is formed in one direction, a hole for passing a screw is provided near the bottom of the rectangular groove, and a mounting plate is provided. a plate-shaped spacer placed in contact with one surface of the spacer; a toroidal transformer body placed in contact with a surface of the spacer opposite to the mounting plate; another portion of the primary conductor having a length a rotating body-shaped holder having a groove formed in the axial direction on the outer circumferential surface to be inserted and held in the direction, a screw hole in the center that coincides with the axis, and inserted and held in the hollow part of the transformer body; are fastened with screws so that the grooves of the holder and the square grooves of the spacer correspond to each other, and the primary conductor is connected to the square grooves of the spacer and the grooves of the holder. The through-type transformer is bent into a U-shape along the surface of the transformer main body, and each leg of the U-shape extends outward. 2) An annular transformer body placed in contact with one surface of the mounting plate; fitted into an opening in the hollow part of the transformer body on the opposite side to the mounting plate, and aligned with the axis at the center. a rotating body-shaped holder having a screw through hole; the holder is screwed by a conductive rod-shaped screw body that is passed through the transformer main body along each axis; A feed-through transformer characterized in that a primary conductor is connected to each end so as to extend in the same direction along each surface of the mounting plate and the holder.