JPH0447941Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the tap switching structure of a molded transformer, etc. that has a cooling spacer inside the coil body, and in particular, to improving the fixing method of the terminal block for fixing the tap terminals. It is.

[Conventional technology]

FIG. 4 is a side view showing an example of a conventional tap switching structure, and FIG. 5 is a plan view thereof. In these figures, 1 is a coil body formed by winding a conductor, 2 is a tap conductor provided to change the voltage of the transformer, and 3 is a threaded portion 3a at one end.
The other end is a tap terminal electrically connected to the tap conductor 2 by crimping or the like. Reference numeral 4 denotes a terminal block for fixing the tap terminal 3 at an appropriate position with a predetermined insulation distance, and this terminal block 4 is supported by the tap conductor 2. Reference numeral 5 designates an insulating nut that fastens and fixes the tap terminal 3 to the terminal block 4.

The conventional tap switching structure is constructed as described above, and the tap connecting piece (not shown) is connected to the selected two.
A predetermined tap voltage can be obtained by tightening and connecting the screw portions 3a of the tap terminals 3.

[Problems to be solved by the invention] In the tap switching structure as described above, the terminal block 4 is supported by the tap conductor 2, so in a transformer using a relatively thin conductor, Although the tap conductor 2 does not have sufficient rigidity to stably support the terminal block 4, the fixed state of the terminal block 4 becomes unstable, and the reliability of the tap switching part cannot be obtained sufficiently. There was a problem.

This idea was made to solve this problem, and the terminal block that fixes the tap terminal is
The purpose of this invention is to obtain a highly reliable tap switching structure that is securely fixed regardless of the thickness of the tap conductor.

[Means for solving problems]

In the tap switching structure of the transformer according to this invention, the base of the terminal block is embedded in the coil body, a protrusion is provided in the embedded part of the terminal block, and a part of the cooling spacer in the coil body is shared. The above problem is solved by fixing .

[Effect]

In this invention, the base of the terminal block is embedded in the coil body, a protrusion is provided in the embedded part of the terminal block, and a part of the cooling spacer in the coil body is shared to fix the terminal block. The terminal block is securely fixed directly to the coil body.

[Example of idea]

Hereinafter, embodiments of this invention will be described with reference to the accompanying drawings.

First, the configuration of this embodiment will be explained with reference to FIGS. 1 to 3. Fig. 1 is a partially cutaway side view of this embodiment, Fig. 2 is its plan view, and Fig. 3 is a partially cutaway side view of this embodiment.
The figure is a radial cross-sectional view of the coil. In these figures, 1 is a coil body, and a conductor 1a
It consists of a plurality of disc-shaped coils 10 configured by winding the coils in the radial direction. 6 is a plate-shaped tap terminal, and 7 is a terminal block made of an insulating material whose base is embedded and fixed in the coil body 1, and this terminal block 7 is held between adjacent disc-shaped coils 10a and 10b. has been done. 7a is a protrusion provided in the embedded part of the terminal block 7, and is configured to share a part of the cooling spacer 11 in the coil body 1 to fix the terminal block 7. In this configuration, for example, the protrusion 7a is formed into a pipe shape and becomes a part of the cooling spacer 11. Alternatively, the cooling spacer 11 may be configured to pass through the pipe-shaped projection 7a. Reference numeral 12 denotes an insulating spacer, which fills the gap created by embedding the base of the terminal block 7 in the coil body 1. Further, the tap conductor 2 and the tap terminal 6 are electrically connected by a crimp terminal or the like.

Next, the operation of the above embodiment will be explained. In the tap switching structure configured as described above, the terminal block 7 is not supported by the tap conductor 2 as in the conventional tap switching structure, but the base of the terminal block 7 is placed inside the coil body 1. Moreover, since the protrusion 7a provided in the embedded part of the terminal block 7 shares a part of the cooling spacer 11 to fix the terminal block 7, the terminal block 7 is fixed to the coil body 1. It is now fixed directly to
The stability of the fixed state of the terminal block 7 is no longer affected by the thickness of the tap conductor 2.

As described above, according to this embodiment, since the terminal block 7 is directly fixed to the coil body 1, the terminal block 7
is securely fixed regardless of the thickness of the tap conductor 2, the terminal block 7 is extremely stable, and the reliability of the tap switching section is greatly improved.

Furthermore, if the tap terminal 6 is made into a plate shape, for example, it becomes an inexpensive product that does not require special processing, and thus it is possible to reduce the cost. Also,
If the tap terminal 6 itself does not have a threaded portion, it is also possible to facilitate maintenance when a problem occurs with the threaded portion.

Note that this invention is not limited to the above-mentioned embodiment in any way; for example, the number, shape, position, etc. of the protrusions 7a provided on the terminal block 7 may be changed as appropriate depending on the cooling spacer 11 in the coil body 1. All you have to do is set it.

Further, in this embodiment, the base of the terminal block is embedded inside the coil body, but the terminal block does not need to be integral from the base to the tip. These may be composed of a connected body of separate parts.

[Effect of idea]

As explained above, in this invention, a part of the terminal block is embedded in the coil body, a projection is provided in the embedded part of the terminal block, and a part of the cooling spacer in the coil body is shared to fix the terminal block. By doing so, the terminal block is directly fixed to the coil body, so the terminal block is extremely stable, and the reliability of the tap switching section is greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of this invention, Fig. 2 is a plan view thereof, Fig. 3 is a radial cross-sectional view of the coil, and Fig. 4 is a diagram of a conventional transformer. FIG. 5 is a side view showing the tap switching structure, and FIG. 5 is a plan view thereof. In the figure, 1 is a coil body, 6 is a tap terminal,
7 is a terminal block, 7a is a protrusion, and 11 is a cooling spacer. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a tap switching structure of a transformer that has a cooling spacer inside a coil body consisting of a disc-shaped coil and has tap terminals fixed to a terminal block,
A tap switch for a transformer, characterized in that the base of the terminal block is embedded in the coil body, and the embedded part of the terminal block is provided with a protrusion that shares a part of the cooling spacer. structure. (2) The tap switching structure for a transformer according to claim 1, wherein the projection is pipe-shaped and forms a part of the cooling spacer. (3) The tap switching structure for a transformer according to claim 1, wherein the projection is pipe-shaped, and the cooling spacer passes through the pipe.