JPH025523Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high voltage transformer, and particularly relates to a connection structure between a transformer body and a high voltage lead wire.

High-voltage transformers used in various electronic devices, such as flyback transformers, consist of a coil housed in an insulating case to form the transformer body, and a high-voltage lead wire connected to the coil drawn out from a part of the case. For attaching the lead wires to the transformer body, two methods are used: one is to integrate the transformer body and high voltage lead wires using cast resin, and the other is a post-installation method in which the high voltage lead wires are inserted into the transformer body from outside the case and connected. ing.

In the former integrated method, the coil and high-voltage lead wire must be connected in advance when the coil is assembled into the case, so the lead wire gets in the way when assembling the transformer body or casting resin, and the transformer body Since automatic assembly is difficult, manufacturing costs are high and packaging is inconvenient.

On the other hand, in the latter retrofitting method, the lead wires can be connected after the coil is assembled into the case, so the lead wires do not interfere with the assembly process of the transformer body, and the above-mentioned integrated method It has the advantage of being able to solve problems such as.

By the way, in the conventional lead wire connection structure in the retrofitting method, as shown in FIG. A spring 5 is incorporated, and the electrode plate 4 is connected to the coil in the case via the coil spring 5 and diode 6.

The high voltage lead wire 7 inserted into the connection tube 3 includes:
A metal terminal 8 on the inner end side, a sleeve 9 made of rubber or synthetic resin that fits inside the connecting tube 3, and a nut 11 made of synthetic resin that is screwed into the male thread 10 at the end of the connecting tube 3.
and a rubber cap 12 on the outer end side,
After inserting the metal terminal 8 and sleeve 9 into the connecting tube 3, screw the nut 11 onto the male screw 10, press down the sleeve 9, and connect the metal terminal 8 and the electrode plate 4 electrically by the compression of the coil spring 5. It is compressed so that it becomes conductive.

However, the lead wire connection structure described above has a large number of parts and a complicated structure, resulting in high manufacturing costs.In addition, the metal terminal and electrode plate are in contact with each other by pressure from a coil spring, which makes electrical connection difficult. The disadvantage is that it is unstable and it is difficult to seal the connecting tube 3 portion when resin is cast into the case.

This idea was made to eliminate the above-mentioned drawbacks, and it is possible to reduce the number of parts, simplify the structure, and reduce manufacturing costs. The purpose of the present invention is to provide a high voltage transformer with lead wires that can be reliably connected.

An embodiment of this invention will be described below with reference to FIGS. 2 and 3 of the accompanying drawings.

A first example of this invention shown in FIG. 2 uses conductive rubber 21 in place of the electrode plate 4 and coil spring 5 in the conventional lead wire connection structure shown in FIG. Coil high voltage lead wire 7 through
are connected.

The conductive rubber 21 is formed into a cylindrical shape with a diameter that fits tightly into the inner end of the connection tube 3. By piercing the lead terminal 22 of the diode 6 into the conductive rubber 21, the conductive rubber 21 and the diode 6 can be connected. connection is being made.

Metal terminal 8 fixed to the inner end of the high voltage lead wire 7
A sharp-pointed pin 23 is provided protrudingly to pierce the conductive rubber 21, and a sleeve 9, a nut 11, and a cap 12 are attached to the high-voltage lead wire 7.

The first example of this invention has the above-mentioned configuration, and in order to connect the high voltage lead wire 7 to the transformer body 11, a conductive rubber 21 is placed inside the connection tube 3.
After inserting and piercing the lead terminal 22 of the diode 6, insert the high voltage lead wire 7 and tighten the male screw 10.
If you screw together the nut 11 and push the sleeve 9,
The pin 23 of the metal terminal 8 pierces the conductive rubber 21, and the high voltage lead wire 7 is electrically connected to the coil via the conductive rubber 21 and the diode 6.

The conductive rubber 21, the high voltage lead wire 7, and the diode 6 may be connected by just contacting each other by the compressive elasticity of the conductive rubber 21, but as shown in the figure, it is possible to connect the conductive rubber 21 with the high voltage lead wire 7 and the diode 6. This will increase the reliability of the electrical connection.

Further, by using the conductive rubber 21, if the conductive rubber itself has a predetermined resistance, this resistance can also be used as a series protection resistor. This resistance value can be freely selected depending on the amount of carbon, etc. mixed into the rubber. In addition, conductive rubber 2
1 seals the connecting tube 3 and serves as a plug when synthetic resin is cast into the case 2, thereby preventing the resin from leaking out.

Next, the second example shown in FIG. 3 has a simpler structure than the first example to facilitate assembly, and the same parts as those in the first example are given the same reference numerals.

On the inner surface of the connecting tube 3 of the case 2, there is a protrusion 24 for positioning the conductive rubber 21 inserted from the case 2 side, and a retaining protrusion 2 at a position closer to the tip than the protrusion 24.
5 is provided.

A lifting piece 26 is provided on the outer peripheral surface of the metal terminal 8 fixed to the tip of the high-voltage lead wire 7 by means such as soldering or caulking, which engages in the direction of the stopper after forcibly passing through the stopper protrusion 25. There is.

The tip of the connecting tube 3 is formed straight, and the high voltage lead wire 7 has a cap 27 made of dust-proof rubber, heat shrink tube, etc. that fits on the tip of the connecting tube 3.
is inserted through it, and a cap 12 is attached to the tip.

In this second example, in order to connect the high voltage lead wire 7 to the transformer body 1, the conductive rubber 21 is inserted into the connecting tube 3 to a position where it abuts the positioning protrusion 24, and then the high voltage lead wire 7 is connected to the transformer body 1. 7 into the connecting tube 3, and push it in so that the metal terminal 8 passes through the retaining protrusion 25. The lead terminal 22 of the diode 6 is
The high voltage lead wire 7 is pierced into the conductive rubber 21 before or after being inserted into the connection tube 3.

The pulling piece 26 provided on the metal terminal 8 is forced to pass through the retaining protrusion 25 by bending inward, and after passing, it restores itself due to its own elasticity and moves against the retaining protrusion 25. Engage in the locking direction.

Therefore, the high voltage lead wire 7 is connected to the case 2 in a state where it cannot be removed, and at the same time, the pin 23 of the metal terminal 8 pierces the conductive rubber 21, and the high voltage lead wire 7 and the coil are connected to the conductive rubber 21 and the coil. It is electrically connected via a diode 6, and then a cap 27 is fitted to the tip of the connecting tube 3.

In this second example, since the metal terminal 8 is held between the conductive rubber 21 and the retaining protrusion 25 by the elasticity of the conductive rubber 21, there is no wobbling of the high voltage lead wire 7, and at the same time, the connection tube 3 If resin is cast inside, high airtightness can be obtained, and the assembly work can be simplified compared to the first example.

In each example, the cap 12 is attached to the outer end of the high voltage lead wire 7, but it is also possible to connect a rectifier pack to the end of the lead wire and attach a cap to the output wire. good.

As described above, according to this invention, conductive rubber is used to connect the coil side of the transformer body and the high voltage lead wire, so it is possible to reduce the number of parts in the connection structure of the lead wire retrofit method. Product costs can be reduced by improving work efficiency.

In addition, if conductive rubber is used to provide the necessary resistance, it can also be used as a series protection resistor, and when resin is poured into the case, the conductive rubber acts as a stopper, allowing the connection tube to be It is possible to prevent the occurrence of resin leakage.

Furthermore, since the conductive rubber has excellent elasticity, the connection portion with the lead wire can be held elastically, and a reliable electrical connection can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing the main parts of a conventional high voltage transformer, Fig. 2 is a longitudinal sectional view of the main parts showing the first example of this invention, and Fig. 3 is a longitudinal sectional view of the main parts showing the second example of the invention. It is a front view. 1... High voltage transformer, 2... Case, 3... Connection tube, 7... High voltage lead wire, 8... Metal terminal, 2
1... Conductive rubber, 22... Lead terminal, 23...
... Pin, 24 ... Positioning projection, 25 ... Retaining projection, 26 ... Lifting piece, 27 ... Cap.

Claims (1)

[Scope of utility model registration request] In a high-voltage transformer where the output of a coil housed in an insulating case is drawn out by a high-voltage lead wire through a connection tube provided in the case, a conductive transformer in which the connection between the output side of the coil and the high-voltage lead wire is inserted into the connection tube. A high-voltage transformer characterized in that the voltage is transmitted through rubber.