JPS6048086B2 - 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 cross-sectional view taken along the line ■-■ in FIG. As shown in this figure, the conventional capacitor device has a plurality of capacitors 2 (seven in the figure) installed in an outer box 1,
These capacitors 2 are connected in parallel to form a large capacitor. This is, for example, a circuit voltage of 1500
In the V chopper control device, 7 large capacitors (tank size 12 x 560 wL x height 40 -) with rated voltage 1800 VDC and rated capacity 460 μF are connected in parallel.
Configure a capacitor of 0μF×7×3220μF.

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.

A terminal block 3 is provided on the upper part of the outer box 1, and 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 1 and another device (not shown). Generally, the case of a capacitor uses a thin iron plate (thickness 1.6 mm or less), and has a structure in which the case deforms due to the volumetric expansion or contraction of the impregnated oil filled inside.

Therefore, as shown in Figure 1, when multiple capacitors are installed side by side, a predetermined gap (usually 30 to 5 (yffun)) is required between adjacent capacitors, and the length dimension of the capacitor device, i.e. The horizontal dimension in Fig. 1 has increased.Furthermore, the parallel conductor 5, the terminal block 3, and the connecting conductor 6 are arranged on the top of the capacitor 2 as described above, and these charged parts and the outer box A space insulation distance of a predetermined dimension is required to insulate between the terminal block 1 and the charged part, and when attaching and detaching the conductor to and from the bushing, and when attaching and detaching the external wiring 7 to the terminal block 3, there is a space where a torque wrench or spanner can be operated. Since the height of the capacitor case cannot be increased due to the necessity, the horizontal dimension of the capacitor device shown in Figure 1 has been increased in order to increase the thickness of the capacitor case or increase the number of capacitors. .

Furthermore, the capacitor device has a disadvantage in that it is heavy and the manufacturing cost increases depending on the external dimensions of the capacitor device. In order to eliminate these conventional drawbacks, it is conceivable to combine a plurality of capacitors into one large capacitor 2, as shown in FIGS. 3 and 4. Furthermore, as shown in Fig. 5, by providing a bushing 8 on the side of the capacitor, the height of the capacitor 2 case can be increased, making it possible to shorten the length of the capacitor (the horizontal dimension in Fig. 3). It is possible to make the capacitor device smaller and lighter.
The present invention aims to make the conventional capacitor device 2 as described above smaller and lighter, thereby obtaining an inexpensive capacitor device.

FIGS. 6 and 7 show an embodiment of this invention.

As is clear from this figure, the capacitor device according to the present invention does not use an outer box, and one large capacitor 31 2 is mounted directly under the floor of the vehicle body 14. Therefore, the case of capacitor 2 is 3.2m! n~6T! A mounting bracket 2a for fixing to the vehicle body 14 is fixed to the upper part of the case by a method such as welding. A bushing 8 is provided on the side surface of the case of the capacitor 3j, and a terminal box 11 is attached to the side surface of the capacitor case 2 by welding, screwing, or the like so as to house the bushing 8. Inside the terminal box 11, a terminal block 3 for connecting the external conductor for wiring the capacitor device and other devices (not shown) 46 is installed on the terminal box 11 or the wall of the case of the capacitor 2. and the bushing 8 are connected by a conductor 4. Furthermore, terminal box 1
An exit hole 7a for pulling in the external conductor 7 and a cleat 13 for fixing the conductor are provided on the upper part of the conductor 1. A cover 12 is provided on the open part of the terminal box 11 to seal the inside of the terminal box to prevent rain, snow and dust from entering and to prevent insulation deterioration. The capacitor device according to the present invention as described above has the following effects.

(a) Since the capacitor is attached directly to the vehicle body, the height of the capacitor case can be increased.

If the volume of the capacitor case remains the same, the length can be reduced by the increase in height, so the capacitor device can be made smaller and lighter. In conventional models, the capacitor was further housed in the outer box, so in order to be able to attach and remove the capacitor from the outer box, the height of the capacitor had to be made significantly smaller than the height of the outer box. .

(b) Since charged exposed parts such as bushings, terminal blocks, and conductors are stored in a sealed box provided on the side of the capacitor, there is no risk of insulation deterioration due to rain, snow, dust, etc.

Furthermore, since most of the capacitor case is exposed, even if the capacitor itself generates heat due to energization, heat dissipation is better than in conventional devices, resulting in lower temperature rise and longer life of the capacitor. (c) Since an outer box is not required, manufacturing costs are reduced and the capacitor device is lightweight.

d) Since the capacitor is configured with one piece, the number of bushings is reduced compared to conventional devices, so leakage accidents of capacitor impregnated oil are reduced, resulting in a highly reliable capacitor device.

e) The parallel conductor 5 and connecting conductor 6 of the conventional device are no longer required,
Wiring work is easy and the number of electrical connections is reduced, reducing burnout accidents caused by poor contact.

As described above, the capacitor device of the present invention has a very simple structure, greatly improves the compact size and weight reduction required for a vehicle device, and makes it possible to manufacture a highly practical capacitor device.

In addition, in the capacitor device of the present invention, since the iron plate of the capacitor F is thicker than that of conventional products, even if the internal pressure changes due to the volumetric expansion or contraction of the capacitor impregnating oil, the capacitor case remains stable. )The amount of deformation is small.

A bellows or the like may be provided at any location of the capacitor case to absorb pressure changes in the capacitor case. Note that this bellows generally has low mechanical strength, so
It is preferable to protect the bellows by installing it inside the terminal box.

[Brief explanation of the 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 ■-■ of Fig. 1, and Fig. 3 is a conventional Figure 4 is a front view of the capacitor device with the inspection cover removed.
5 is a sectional view of another conventional capacitor device, FIG. 6 is a front view showing an embodiment of the present invention, and FIG. 7 is a sectional view taken along line 1 in FIG. 6. It is. In the figure, 2 is a capacitor, 2a is a mounting bracket, 3 is a terminal block,
4 is a conductor, 7 is an outer conductor, 8 is a bushing, 11 is a terminal box, 12 is a cover, and 14 is a vehicle body.

Claims (1)

[Scope of Claims] 1. A capacitor device comprising a bushing for electrically connecting the inside and outside of the capacitor, and a terminal block for connecting the capacitor to the outside, the bushing and the terminal block being connected by a conductor, A terminal box having an open part is provided on the wall of the capacitor case, the bushing, the terminal block, and the conductor connecting these are housed in the terminal box, and a cover is provided to seal the open part of the terminal box. Characteristic capacitor device. 2. The capacitor device according to claim 1, characterized in that a terminal box is provided on the side wall surface of the capacitor. 3. The capacitor device according to claim 1 or 2, wherein the terminal block is fixed to the terminal box. 4. The capacitor device according to claim 1 or 2, wherein the terminal block is fixed to the wall of the capacitor case and stored in a terminal box.