JPS58273Y2 - Terminal attachment device for electrical equipment windings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a terminal attachment device for electrical equipment, such as a portable small transformer for induction heating.

Before explaining this terminal attachment device, a conventional small transformer for induction heating will be briefly described.

This transformer is shown in FIGS. 1, 2, and 3.

In this figure, an inner cylindrical portion J a inside the cylindrical core 2 and an outer cylindrical portion 4 b serving as a frame on the outer periphery of the primary coil 3 .

The end plate 4c constitutes the secondary coil 4.

A terminal 7 is fixed to the outer cylindrical part 4b of the secondary coil via a conductive flange 5.6, and a terminal of the inner cylindrical part 4a of the secondary coil is supported on the conductive flange 6 by an insulating plate 8. 9
A tubular induction coil 10 is disposed between the two.

Therefore, when a medium-high frequency power source is connected to the external terminals 1 a and 1 b, a current flows through the primary coil 3 wound around the cylindrical iron core 2, and a current flows through the induction coil 10 to induction heat the object to be heated. .

On the other hand, cooling water enters the inner cylindrical portion 4a from the introduction pipe 11 attached to the end plate 4c through the hole 12 of the end plate 4c, and furthermore, the terminal 9,
It enters the outer cylindrical portion 4b via the induction coil 10 and the terminal 7, and exits from the discharge pipe 14 via the hole 13 in the end plate 4c.

Reference numeral 15 denotes an insulator that covers the outer cylindrical portion 4b of the secondary coil.

In this transformer, the internal lead wire 16 (shown in FIG. 3) of the secondary coil 3 and the external terminals 1a and 1b were connected as follows.

That is, the end plate 4c and the insulating support plate 17 attached to the outside thereof are provided with holes 18 and 17a, respectively, through which the internal lead wire 16 passes, and the hole 17a is further provided with a large diameter portion 17a' outwardly.

On the other hand, a conductive terminal block 19 is provided, and the supporting plate 1
The large diameter portion 17a' of the hole No. 7 is provided with a convex portion 19a for housing.

To attach the internal lead wire 16 to the terminal block 19 and support it with the support plate 17, cut the internal lead wire 16 to an extra length and secure the outer end to the terminal block 19 with the mounting screw 20.
Then, attach the protrusion 19a of the terminal block 19 to the seal ring 21.
Fit the bolt 22 into the large diameter portion 17a' of the support plate 17 through the
Attach the terminal block 19 to the support plate 17 (as shown in FIG. 1).

In this case, the internal lead wire 16 becomes press-fitted and bends in a meandering manner.

In order to reduce the size and weight of this transformer, the cooling water sealing method is used as described above, and the primary coil 3 is covered with a water-resistant insulating tube (not shown). Due to deformation of the internal lead wire 16 during assembly or disassembly, or contact with the edges 4c' and 4C'' of the secondary coil 4, the insulation may be damaged, resulting in concerns about insulation resistance.

The object of this invention is to provide a terminal attachment device for electrical equipment windings that eliminates the problems of the prior art as described above and is easy to attach.

An embodiment of this invention will be described below with reference to FIGS. 4 and 5.

Note that the same reference numerals as in FIGS. 1 to 3 indicate members having the same functions, and the explanation will be omitted if unnecessary, and only the different points will be described.

The tip of the internal lead wire 16 extending outside the support plate 17 is bent at a substantially right angle, and a hole 16a' is provided in the bent end 16a.

The terminal block 19 attached to the support plate 17 has a hole 1 large enough for the internal lead wire 16 and its bent end 16a to pass through.
9a is provided.

This hole has a step portion 19b extending laterally outward, and the hole 16a of the bent end portion 16a of the internal lead wire 16 is located at the step portion.
It has a screw hole 19c that corresponds to .

Therefore, the terminal block 19 is attached to the insulating plate 17, and the hole 16a' at the bent end of the internal lead wire 16 is inserted into the screw hole 1 of the terminal block 19.
9c and secure it by turning a screw 23 such as a bolt from the outside, and secure it with a blind plate 24 via a seal ring 21 using a cover screw 22 (shown in FIG. 4).

According to this invention, the internal lead wire can be fixed to the terminal block after the terminal block is attached to the insulating plate, so the length can be selected in advance so that the internal lead wire will not bend. Not only will the lead wire not be damaged, but the lead wire will not be severely bent and the sheath will not crack, and reliability can be greatly improved.

This simplifies assembly and disassembly.

[Brief explanation of the drawing]

Figures 1 to 3 are a plan view of the conventional device, a cross-sectional view taken along the line ■-■, a cross-sectional view taken along the line ■-■, and Figures 4 and 5 are a plan view of the device and a cross-sectional view taken along the line V-V. It is a diagram. 1 a, 1 b...External terminal, 2...
・Cylindrical core, 3...Primary coil, 4...
・Secondary coil, 16...Internal lead wire, 16a
...Bent end, 17...Support plate, 17
a...Support plate through hole, 19...Terminal block, 19b...Step part, 23...Screw, 2
4...Blind board.

Claims (1)

[Scope of utility model registration request] A through hole is formed in a case-shaped secondary coil surrounding a primary coil of an electric device and an insulating support plate attached to the case, and a bent end with a hole is formed at an almost right angle to the end of the primary coil. A conductive terminal block is fixed to the supporting plate, and the bent end with the hole is formed in the terminal block and passed through the through hole of the support plate and the secondary coil. A hole through which the
A stepped hole extends to the side of the hole to receive the bent end with the hole, and the bent end with the hole is electrically connected to the stepped inner wall, and the hole of the terminal block is connected with a blind plate. A terminal attachment device for electrical equipment winding, characterized in that it is covered.