JPS6048087B2 - 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.

A chopper control device using semiconductors such as thyristors is used as a control device for the main motor of an electric vehicle, but since this control device controls high voltage and large current intermittently, high voltage,
A large capacity filter capacitor is used to smooth the current flowing through the 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--2 in FIG. As shown in this figure, in the conventional capacitor device, a plurality of capacitors 2 (seven in the figure) are installed in an outer box 1, and these capacitors 2 are connected in parallel to form a large-capacity capacitor. There is. This is, for example, a circuit voltage of 150
0V chopper control device has a rated voltage of 1800VDC)
Large capacitor with rated capacity 460 μF (tank size 12
0-! rfm×560Tf! XL x height 400Tnm)
Connect seven of them in parallel to form a 460pF x 7 x 3220μF 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 vehicle vibration, the external force acting on the bushings is minimized. In order to do this, the conductor connected to the bushing was made of a highly flexible electric wire. In addition, a terminal block 3 is installed on the top of the outer box 1,
It is connected to the parallel conductor 5 by a conductor 6. This terminal block 3 is provided to connect external wiring 7 between the capacitor device and another device (not shown). However, in the conventional capacitor device 5 having such a configuration, the structure is complicated because the capacitor bushing 8, the parallel conductor 5, the terminal block 3, and the conductors 4 and 6 connecting these are arranged, and the electrical connection is difficult. The number of locations was increasing.

Furthermore, a conductor 4 is connected between the outer box 1 and the bushing 8 of the capacitor.
, 5, and 6, and because it is a high-voltage circuit, insulation distance must be ensured, outer box 1 and bushing 8
A large space was required between them. Since the capacitor device is installed under the floor of an electric car, the maximum height of the outer box is determined by the vehicle limit, so the large space required above the bushing for the above conductor arrangement is a problem with the capacitor case. Since the height dimension had to be reduced, the lengthwise dimension of the capacitor device increased accordingly, and the installation area of the capacitor device became large. or,
Since the capacitor bushing 8 is soldered and fixed to the case, its mechanical strength is low and its tightening torque is limited.

Therefore, normally a torque wrench is used to tighten the bushing to a specified torque value, but as mentioned above, conductors are arranged in a complicated manner around the bushing, so there is a drawback that it is difficult to tighten with a torque wrench. It was hot. The present invention has been made in order to improve the drawbacks of the conventional devices as described above, and it is an object of the present invention to provide a capacitor device that is easy to wire.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. Capacitor 2 consists of one large capacitor,
This is stored inside the outer box 1. The terminal block 3 is attached and fixed to the upper surface of this capacitor case via a metal fitting 3a or the like. A flexible conductor 4 is connected between the bushing 8 of the capacitor fixed to the capacitor case and the terminal block 3.
Connect. Terminal block 3 is located outside the capacitor device and other devices. The fixing fitting 3a is provided to connect the external wiring 7, but since the fixing fitting 3a is firmly fixed to the capacitor case by welding or the like, external force may not be applied to the terminal block 3 due to vibration of the external electric wire 7. It will not be damaged either. As described above, in the present invention, by providing the bushing 8 and the terminal block 3 for external wiring connection in the capacitor case, the wiring work between the bushing 8 and the terminal block 3 can be done before storing the capacitor in the outer box. , wiring work can be done easily and in a short time.

Furthermore, compared to conventional capacitor devices, the conductor arrangement structure is extremely simple, and the number of electrical connection points is reduced, reducing abnormal heating accidents caused by poor contact on the connection surfaces. In addition, since the wiring structure is simple, capacitor 2
Since the space between the capacitor case and the outer box 1 can be made smaller, the height of the capacitor case can be increased accordingly, which has the advantage of shortening the length of the capacitor device and reducing the installation area.

In addition, since the bushing 8 and the terminal block 3 are fixed to the top plate of the capacitor case, once the bushing and the terminal block are wired, there is no need to disconnect this wiring when installing or removing the capacitor from the outer box. The screws at the wiring connection can be fixed with soldering or adhesive to prevent them from loosening, reducing abnormal heat generation and burnout accidents due to loosening of the screws.

Furthermore, since the case of a capacitor is usually made of a thin iron plate, the case is deformed due to thermal expansion of the insulating oil filled inside the capacitor.

Therefore, since conventional capacitor devices use a plurality of capacitors, it is necessary to provide a gap between adjacent capacitors so that there is no problem even if the case is deformed. Since one type capacitor is used, there is no need for the above-mentioned gap, and the capacitor device has the advantage of being able to be significantly miniaturized. Also, the bushing is 2
Since it consists of only one bushing, the oil-tight reliability of the capacitor is improved, and since two bushings can be placed on the front side of the capacitor box, there are other advantages such as easy checking for oil leaks. be.

FIG. 5 is a diagram showing another embodiment of the present invention, in which a bushing 8 and a terminal block 3 are provided on the side surface of the capacitor case, and the wiring work is easier than that in FIG. 4. It also has the advantage of being easy to check for oil leaks in the bushing.

Further, in this structure, since no bushing is provided above the capacitor, the height of the capacitor case can be increased, which has the advantage of shortening the length of the capacitor device.

[Brief explanation of drawings]

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 capacitor device according to the present invention with the inspection cover removed. FIG. 4 is a sectional view taken along line 1-1 in FIG. 3, and FIG. 5 is a sectional view showing another embodiment of the present invention. In the figure, 2 is a capacitor, 3a is a mounting bracket, 3 is a terminal block,
4 is a conductor, 7 is an external conductor, and 8 is a bushing.

Claims (1)

[Claims] 1. A capacitor is housed in an outer box, and includes a bushing for electrically connecting the inside and outside of the capacitor, and a terminal block for connecting the capacitor to the outside, wherein the bushing and the terminal block are connected to each other. What is claimed is: 1. A capacitor device comprising a bushing and a terminal block fixed to a capacitor case, and a conductor connecting the bushing and the terminal block. 2. The capacitor device according to claim 1, wherein both the bushing and the terminal block are fixed to the top plate of the capacitor case. 3. The capacitor device according to claim 1, wherein both the bushing and the terminal block are fixed to the side plate of the capacitor case.