JPS5844587Y2 - Terminal device for capacitors - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvements in terminal devices for capacitors.

Conventionally, as shown in FIG. 1, as a terminal device used for a power container or the like, an insulator 5 having gold plating layers 3 and 4 is placed in a mounting hole 2 provided in a case top cover 1, and an external terminal 6 is connected to the insulator 5. There is one in which the upper cover 1, the insulator, and the external terminal 6 are integrally fixed and sealed by penetrating the terminal through hole 7 provided in the insulator 5 and soldering the metal plating layers 3 and 4.

However, with the terminal device as described above, the degree of adhesion of the metal plating layers 3 and 4 to the insulator 5 is unstable, and since the insulator 5 is susceptible to temperature changes, cracks in the insulator 5 caused by heating during soldering or soldering may occur. This method has drawbacks such as the risk of impregnating agent leakage due to pinholes caused by mistakes in soldering, and the fact that soldering requires a high level of skill and a lot of work time.

For this reason, in recent years, as shown in FIG. 2, an insulating bushing 13 is placed above the mounting hole 12 provided in the case top cover 11, and an elastic sealing body 14 made of silicone rubber or the like and a press pad 15 are placed below. The head 1 is inserted into the through hole provided in the elastic sealing body 14 and the press port 15.
6 are connected to each other, and then a nut 18 is screwed from the tip of the external terminal 17 to compress the elastic sealing body 14, and the case upper lid 11. An insulating bushing in which a 13° elastic sealing member 14 and an external terminal 17 are integrally fixed has been put into practical use.

The capacitor terminal device constructed as described above is used to seal the opening of a case (not shown) which houses a capacitor element (not shown) and is filled with impregnating oil.

However, the above capacitor terminal device has mounting hole 12.
The insulating shoe 2 elastic material 35 elastic sealing body 14 and press port 15 are simply assembled into a capacitor by simply combining the external terminal 17 and tightening with the nut 18, so the rotation applied when connecting the connecting wire to the external terminal 17 is avoided. The torque loosens the tightening of the external terminal 17, which loosens the tightening of the insulating bushing 13 and the elastic sealing body 14, making it easy to rotate, resulting in loss of sealing performance and the drawback of causing serious defects leading to leakage of impregnated oil.

The present invention has been made in view of the above points, and consists of connecting each external terminal using a hammer made of a rigid insulating plate at the bottom of the elastic sealing body, and further connecting the hammer and the external terminal with a metal washer with a claw. It is an object of the present invention to provide a terminal device for a capacitor which has stable performance with excellent sealing performance and prevents external terminals from twisting or loosening by fixing the terminals through the capacitor.

An embodiment of the present invention will be described below with reference to the drawings.

That is, as shown in FIGS. 3 and 4, terminal mounting holes 22a and 22b made of conical protrusions are provided in the case top cover 21 made of processed brass plate, tin plate, resin, etc., and the terminal mounting holes 22a are provided. , 22b are each provided with an insulator 24 like a bushing made of processed resin and provided with a terminal through hole 23, and an elastic sealing member 26 such as silicone rubber with a terminal through hole 25 provided in the lower part. A terminal through hole 27 is provided in the lower part of the elastic sealing body 26 as shown in FIG. , for example, with a punch 29 made of a rigid insulating plate made of glass epoxy, phenol, glass polyester, or the like.

As shown in FIG.
The claws 31 a and 31 b of the mounting metal washer 32 provided with the mounting metal washer 32 are fitted respectively, and the screw portion 33 and head 34 as shown in FIG. 7 are connected to the mounting metal washer 32 part. Penetrate each terminal 35, fit a nut 36 from the tip of the threaded portion 33, tighten the head 34, and fix the head 34 and the metal washer 32 with solder 37 to each. This is what happens.

Note that the specific selection of the thickness of the punch 29 is determined by the size of the container, the size of the screw of the threaded portion 33 constituting the external terminal 35, and the material of the punch.

In other words, since the punch 29 requires strength to support the rotational force applied to the external terminal 35, the size of the capacitor is required to be rigid, which hinders the reduction in size and weight of the capacitor. In addition, the size of the screw of the screw portion 33 constituting the external terminal 35 may be comprehensively considered and the size of the screw may be selected appropriately.For example, if an external terminal with a 4 mm screw is used and glass epoxy is used as the punch, If it is 0 mmt or more, it can have enough strength to support the rotational force applied to the external terminal.

In the capacitor terminal device configured as described above, each of the external terminals 35 is connected by a mallet 29 made of a rigid insulating plate, and each of the external terminals 35 is connected to the mallet 29 made of a rigid insulating plate.
The external terminals 35 are fixed to each of the external terminals 35 by fixing them with the mounting metal washer 32 fitted to the locking part 28 of the connector and the solder 37, so that the external terminals 35 can be attached to the external terminals 35 when the external terminals 35 are assembled into a circuit and used. When the connection line is connected, even if rotational torque is applied to the external terminal 35, the external terminal 35 does not rotate.

Therefore, the tightening has the advantage that the parts will not loosen and the sealing performance will not be impaired.

In addition, as shown in FIG. 8, an insulator 38 formed in a bowl shape
If the resin 39 is filled with resin 39 after screwing the nut using the nut, it will have a reinforcing effect around the external terminals and against loosening of the external terminals, and at the same time will have the effect of further improving the sealing performance.

Next, the effects of the present invention will be explained in detail based on experimental results.

That is, the rotational torque test results for the present invention A shown in FIG. 3 and the conventional reference example B shown in FIG. 2, and A for the case opening filled with insulating oil.

The table below shows the condition of insulating oil leakage after connecting the connecting wires under the same conditions as when using the completed capacitor with external terminals using B and incorporating it into the circuit and leaving it in a constant temperature bath at 75°C for 30 minutes.

There are 20 samples in each case.

The external terminals in (A) and (B) both have 4 mm bolt screws, the punch in (A) is a glass epoxy plate with a thickness of 1.2 mm, and the press port in (B) is a one with a thickness of 0.5 mm. The same insulating bushing and elastic sealing body were used in both (A) and (B).

As is clear from the table, in the case of reference example (B), the external terminal starts rotating with a small amount of rotational torque, and there are 75% of cases of insulating oil leakage failure.
On the other hand, the product of the present invention (A) did not cause damage to the external terminals even at a rotational torque of 15 kgcm, and there was no insulating oil leakage defect, demonstrating an extremely excellent effect.

As described above, according to the present invention, in a terminal device for a capacitor having a plurality of external terminals, a stacking rod made of a rigid insulating plate is disposed under the elastic sealing body to connect each of the external terminals, and To provide a terminal device for a capacitor which has good airtightness without loosening around the external terminal by soldering and fixing the external terminal to a mounting metal washer fitted into a locking part provided on the stacking rod. Can be done.

[Brief explanation of the drawing]

1 to 2 are cross-sectional views showing a conventional capacitor terminal device, FIGS. 3 to 7 show an embodiment of the present invention, and FIGS. 3 to 4 show the capacitor terminals. The device is shown in Fig. 3, a front sectional view, Fig. 4, a side sectional view, and Fig. 5, Fig. 3-3.
FIG. 4 is a bottom view showing the stacking rod constituting the terminal device for a container shown in FIG. 4, FIG. This figure is a front view showing external terminals constituting the capacitor terminal device shown in FIGS. 3 and 4, and FIG. 8 is a sectional view showing a capacitor terminal device according to another embodiment of the present invention. 21... Case top lid, 22 a, 22 b.
...Terminal mounting hole, 24.38...Insulator, 26...Elastic sealing body, 23, 25, 27゜3
0... terminal through hole, 28... locking part,
29...Stack rod, 31a, 31b...claw, 32...metal washer with claw 35...
・External terminal, 37...Solder.

Claims (1)

[Scope of Claim for Utility Model Registration] A case top cover with a plurality of terminal mounting holes, an insulator disposed above each of the mounting holes and provided with a terminal through hole, and a terminal through hole disposed at the bottom thereof. a rigid insulating plate with a plurality of terminal through-holes arranged at the bottom of the sealing body and having locking parts around the through-holes; A horizontal rod, a mounting metal washer provided with a terminal through hole fitted into the locking portion, and an elastic material mouth body of the insulator 5. A bolt external terminal having successive heads that pass through the terminal through holes provided in the horizontal rod and the metal washer with claws, and solder that fixes the bolt external terminal head and the mounting metal washer, respectively; A terminal device for a capacitor, comprising a nut fitted to a tip of the bolt external terminal, and each of the bolt external terminals is connected and fixed by the horizontal rod.