JPS6048084B2 - capacitor device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved structure of a capacitor device mounted on an electric vehicle.

Chopper control devices using semiconductors such as thyristors are used as control devices for the main motors of electric cars, but in order to control high-voltage current intermittently, these control devices use high-voltage, large-capacity filter capacitors. Smoothes the current flowing through overhead wires and rails.

FIG. 1 is a front view of a capacitor device mounted on an electric vehicle, and FIG. 2 is a longitudinal sectional view taken along line 1 and 2 in FIG.

As shown in this figure, the conventional capacitor device consists of multiple capacitors (
Seven (7) capacitors 2 in the figure are installed in the outer box 1, and these capacitors 2 are connected in parallel to form a large-capacity capacitor. For example, in a chopper control device with a circuit voltage of 1500V, the rated voltage is 1800VDC, and a large capacitor with a rated capacity of 460μF (tank size 120RW) is used.
t×560wE×height 400-mlL) are connected in parallel to form a 460 μF×7×3220 μF capacitor.

An inspection cover 1a is provided on the outer box 1 so that the capacitor can be attached and detached and inspected. The structure of this capacitor is that two parallel conductors 5 are fixed to the outer box 1 via an insulator 9, and the parallel conductors 5 and the bushing 8 of the capacitor are connected by a conductor 4 having good flexibility.

This is because capacitor bushings are generally fixed to the capacitor case by soldering, so their mechanical strength is low, so even if each capacitor swings due to vibrations between the two, the external force acting on the bushings is minimized. For the conductor connected to the bushing, a highly flexible electric wire was used. - Also, a terminal block 3 is provided on the top of the outer box 1, and is connected to the parallel conductor 5 with a conductor 6.

Note that this terminal block 3 is provided for connecting external wiring 7 between the capacitor device 1 and another device (not shown). As described above, in the conventional capacitor device, the parallel conductor 5, the terminal block 3, and the connecting conductors 4 and 6 are arranged in the space above the outer box and the capacitor, so when the capacitor 2 is attached or removed from the outer box 1, A drawback was that it was difficult to attach and detach the capacitor bushing and the conductor 4.

In addition, since the bushing 8 of the capacitor 2 is fixed to the capacitor case by soldering, its mechanical strength is low.
The bushing screws are tightened to the specified tightening torque using a torque wrench, but in the structure shown in Figures 1 and 2, the conductors 5 and 6 are arranged in a narrow space above the capacitor, and the second
The torque wrench had to be operated from the left and right directions in the diagram, making the wiring installation and removal work even more difficult.

The capacitor case itself is manufactured by welding thin iron plates, but the bushing is soldered and sealed as described above.

The soldered portion of this bushing has low mechanical strength, and there is a high risk that pinholes and minute cracks that could not be detected during manufacturing will be accelerated and enlarged due to vibrations of the vehicle and the seal will be broken. If the seal is broken in this way, air and moisture will enter the capacitor, deteriorating the impregnating oil and reducing the insulation of the capacitor, so it is better to detect it as early as possible. That is, when the capacitor device is operated, the capacitor generates heat, the impregnated oil expands, and oil leaks from the location where the seal is broken. Therefore, it is possible to discover whether the seal is normal or not based on the presence or absence of oil leakage. However, in conventional capacitor devices, the bushing is provided on the top surface of the case, making it difficult to visually check for oil leaks from the left and right directions in FIG. The present invention has been made to improve the above-mentioned drawbacks, and one embodiment of the present invention is shown in Figs. 3 and 5 below.
This will be explained with reference to FIG.

A plurality of capacitors 2 (seven in the figure) are installed inside the outer box 1. The parallel conductor 5 is installed on the side surface of the outer case 1, and is fixed to the outer case 1 via an insulator 9 at both ends thereof. Further, three bushings 8 are provided on the side surface of the capacitor 2, and the bushings 8 and the parallel conductor 5 are connected by a conductor 4 having good flexibility. In addition, a terminal block 3 is fixed to the setting side of the bushing 8 at the inside upper part of the outer box 1, and the parallel conductor 5 of this terminal block 3 is connected with a conductor 6. Connect the external conductor 7 to be wired (not shown).

Note that an inspection cover 1a is provided on the side of the outer box 1 so that inspection can be easily performed from the left and right directions shown in FIG. R As described above, in the present invention, the bushing 8 is provided on the side of the capacitor, and the parallel conductor 5, the terminal block 3, and the conductors 4 and 6 are arranged on the bushing 8 side of the capacitor. The wiring work can be easily performed from the front side in FIG. 3.

In addition, it is easy to check for oil leaks at the mounting portion of the bushing 8 of the capacitor 2, and it is extremely unlikely that oil leaks will be overlooked. In addition, since the capacitor bushing is provided on the side, the height of the capacitor case can be increased.
There is also the advantage that the capacitor device is compact, and a highly practical capacitor device can be provided.

When removing the capacitor from the outer box, the capacitor can be easily removed in the left direction in FIG. 4 by removing the conductor 4 connected to the bushing and then removing the mounting screw 10.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional capacitor device with the inspection cover removed, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a front view showing an embodiment of the present invention. , FIG. 4 is a cross-sectional view taken along the line ■-■ in FIG. 3. In the figure, 1 is an outer box, 1a is a cover, 2 is a capacitor, 3 is a terminal block, 4 is a conductor, 5 is a parallel conductor, 6 is a conductor, 7 is an external conductor, and 8 is a bushing.

Claims (1)

[Scope of Claims] 1. A capacitor device in which a capacitor is housed in an outer box, a terminal block is fixed to the outer box, and the terminal block and a bushing attached to the capacitor are connected by a conductor. A capacitor device characterized in that a bushing is attached to a side surface of the case, and the terminal block is provided on the same side as the side on which the bushing is installed at the upper inside of the outer box. 2. The capacitor device according to claim 1, wherein the parallel conductor and the connection conductor between the parallel conductor and the bushing and the terminal block are respectively provided on the side surface of the capacitor on the side where the bushing is attached.