JPH0447940Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a support structure for a tap switching terminal section of a molded transformer, in particular, a switching structure that is improved in fixing a terminal block that supports the tap terminal. be.

[Conventional technology]

4 and 5 are a front view and a side view, respectively, showing a conventional tap switching structure.
2 is a coil body formed by winding a conductor; 2 is a tap conductor provided to change the voltage of the transformer; 3 is a tap conductor provided to change the voltage of the transformer;
is a tap terminal which has a threaded portion 3a at one end and is connected to the above-mentioned tap conductor 2 at the other end. The tap terminal 3 and the tap conductor 2 are connected to each other by crimping or the like. Reference numeral 5 designates a terminal block for fixing the above-mentioned tap terminal 3 in a fixed position while ensuring a predetermined insulation distance, and reference numeral 7 designates an insulating nut for tightening and fixing the tap terminal 3 to the terminal block 5.

The conventional tap switching structure is constructed as described above, and a predetermined tap voltage can be obtained by connecting the tap terminals by tightening a tap connection piece (not shown) to the threaded portion 3a of the tap terminal 3. I'm starting to be able to do it.

[Problem to be solved by the invention] In the tap switching structure as described above, the terminal block 5 is supported by the tap conductor 2, so in a transformer using a relatively thin conductor, Since the tap conductor does not have sufficient rigidity to stably support the terminal block 4, the fixed state of the terminal block 5 becomes unstable, and the tap switching section cannot have sufficient reliability. It was hot.

Another problem was that the tap terminals required special processing, making them expensive.

Furthermore, since the tap terminal itself has a threaded portion, there is a problem in that maintenance is difficult if a problem occurs with the threaded portion.

This invention was made in order to solve this problem, and it is possible to obtain a tap switching structure for a transformer in which the tap terminal can be fixed without depending on the tap conductor, which makes maintenance easy and the tap terminal is inexpensive. The purpose is to

[Means for solving problems]

The tap switching structure of the transformer according to this invention solves the above problems by embedding and fixing the base of the terminal block, which fixes the tap terminal, inside the coil body.

[Effect]

In this invention, since the base of the terminal block is embedded and fixed within the coil body, the terminal block is securely fixed.

[Example of idea]

1, 2, and 3 are a front view, a side view, and a sectional view, respectively, showing an embodiment of this invention. In these figures, numerals 1 to 3 are exactly the same as the conventional structure described above. 1 is a coil body;
It consists of a plurality of disk shapes formed by winding up the conductor 1a in the radial direction. 4 is a terminal block made of an insulating material, the base of which is connected to the disk-shaped coils 11 and 1.
It is held between the two. This terminal block 4
A protrusion 4a is provided at the base of the protrusion 4a, and the protrusion 4a is pressed and fixed by the conductors 11a and 12a on the front and rear thereof. In addition, in order to ensure a distance corresponding to the projection 4a, the number of conductor windings of the disc-shaped coil passing through the projection 4a is partially reduced. Further, a plate-shaped tap terminal 3 is fixed to the tip of the terminal block 4, and the tap conductor 2 is connected to the tap terminal 3 using a crimp terminal or the like.
Reference numeral 6 denotes an insulating spacer, which is used to close the space between the disk-shaped coils 11 and 12 and the protrusion 4a that occurs when the base of the terminal block 4 is embedded in the coil body 1.
This fills the space between the conductors 11a and 12a before and after the conductors 11a and 12a.

Next, the operation of the embodiment configured as above will be explained.

When performing tap switching, a tap connection piece (not shown) is connected to the tap terminal 3.

On the other hand, as described above, since the base of the terminal block 4 supporting the tap terminal 3 is embedded in the coil body 1, the overall rigidity is improved and the terminal block 4 is firmly supported.

Therefore, even if some external force is applied to the tap connection piece, the terminal block 4 will support the tap terminal 3 against the applied external force. Therefore, the tap conductor 2 will not be damaged by such external force.

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, this invention has a structure in which the base of the terminal block is embedded and fixed within the coil body, so it has the following effects.

(a) Even if the tap conductor is thin, the tap terminal can be securely fixed.

(b) Since tap terminals do not require special processing, an inexpensive transformer can be obtained.

(c) Maintenance of tap terminals becomes easier,
The reliability of the tap switching section can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of this invention, Fig. 2 is a side view showing an embodiment of this invention, and Fig. 3 is a sectional view taken along the - line in Fig. 2.
FIG. 4 is a plan view showing the conventional structure, and FIG. 5 is a side view showing the conventional structure. In the figure, 1 is a coil body, 3 is a tap terminal,
4 is a terminal block, 4a is a protrusion, 1a, 11a, 12a
is a conductor, and 11 and 12 are disk-shaped coils. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) In the tap switching structure of a transformer having tap terminals fixed to the terminal block, the base of the terminal block of the tap switching structure is embedded and fixed within the coil body of the transformer. Features a transformer tap switching structure. (2) The coil of the transformer has a continuous disk structure formed by winding a conductor in the radial direction and forming it into a disk shape, and the terminal block is a coil provided between the disk-shaped coils. 2. The tap switching structure for a transformer according to claim 1, wherein the base portion thereof is embedded in the coil and is clamped and fixed by the disc-shaped coil. (3) The transformer according to claim 1 or 2, wherein the terminal block has a protrusion that is held between the conductors forming the coil body at a portion embedded in the coil body. Switching structure.