JPH09148183A - Capacitor unit - Google Patents

Abstract

(57) Abstract: To obtain a capacitor unit that can easily assemble and replace a capacitor and can reduce the inductance of a connecting conductor. SOLUTION: A stud 4 is erected on four corners of a surface of a mounting plate 3 and a pair of thin rubber plates 5B are placed. Place six electrolytic capacitors 1 in two rows on this rubber plate 5B,
A thick rubber plate 5A is placed on the upper surface of the electrolytic capacitor 1. On the upper surface of the rubber plate 5A, the collective laminated conductor 2 including the insulating plate 8C, the negative electrode conducting plate 7B, the insulating plate 8B, the positive electrode conducting plate 7A, and the insulating plate 8A is placed. In the positive electrode conducting plate 7A and the negative electrode conducting plate 7B of the batch laminated conductor 2, the conduit collars 11A, 11
B, 11C, 11D are press-fitted from both sides, and electrolytic capacitor 1
The terminals 1p and 1n are connected with bolts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor unit connected to a DC filter circuit of a semiconductor power converter.

[0002]

2. Description of the Related Art In a semiconductor power converter using a power semiconductor element, an electrolytic capacitor having a large single capacitance and capable of flowing a high ripple current is used as a smoothing capacitor connected to a DC filter circuit. , Connected in series and parallel according to the connected circuit voltage and the required total capacity.

Since this electrolytic capacitor has a shorter life than other parts constituting the semiconductor power conversion device, it is 5 to 7
Since it needs to be replaced on a yearly basis, the mounting structure of the electrolytic capacitor must be designed so that it can be replaced easily in a short time.

On the other hand, in a semiconductor power converter, a high frequency pulse width modulation (PW) using a high speed switching element is used.
M) The control method is widely adopted. This high frequency PWM
In the control method, in order to reduce the reactance of the conductor connecting the high-speed switching element and suppress the surge voltage generated at the time of switching, the electrolytic capacitors are placed close to each other and installed so that the distance to the high-speed switching element is also short. There is.

FIG. 6 is a connection diagram showing an example of a capacitor unit incorporated in a conventional semiconductor power device, and FIG.
FIG. 8 is a front view showing an assembled state of this capacitor unit.
7 shows the front view of FIG. 7 when six electrolytic capacitors 1 are connected in parallel as shown in the connection diagram of FIG. It should be noted that in an actual product, this unit is further connected in series for use.

7 and 8, in FIGS.
In the right side view (not shown), three electrolytic capacitors 1 are horizontally arranged side by side with respect to the upper and lower tiers, respectively, on the surface of a mounting plate 19 made of a mild steel plate that is bent and formed in a shallow inverted U shape. There is.

A substantially annular mounting member 1a is loosely fitted to the outer periphery of the lower end of each electrolytic capacitor 1, and mounting seats 1b are radially provided at 120 ° intervals on the lower end of the mounting member 1a. ing.

A pair of tightening projections 1c are provided on the upper part of the mounting metal fitting 1a so as to project downward, and a pan head screw (not shown) is provided in a tightening hole (not shown) formed in the projection 1c. The electrolytic capacitors 1 are screwed from the side, and each electrolytic capacitor 1 is fastened by the mounting bracket 1a via the pan head machine screw.

The mounting plate 19 is provided with female screw holes 1d at positions corresponding to the mounting holes formed in the respective mounting seats 1b as shown in FIG. With a pan head machine screw screwed into the hole 1d, the mounting bracket 1
It is fixed to the mounting plate 19 via a.

On a pair of terminal portions 1f projecting upward from the upper end of each electrolytic capacitor 1, four connecting conductors 20 arranged in the left-right direction in FIGS. 7 and 8 are placed. A fixing screw (not shown), which is inserted from above into the connection hole 20a formed in 20 and whose tip is screwed into each terminal portion 1f,
Each connection conductor 20 is fastened to each terminal portion 1f of each electrolytic capacitor 1.

In FIG. 7, the right end of the connection conductor 20 connected to the lower positive electrode side terminal portion 1f of the lower stage and the connection conductor 20 connected to the lower positive electrode side terminal portion 1f of the upper electrolytic capacitor 1 are , A common conductor (not shown) is connected as shown by a broken line.

The left end of the connecting conductor 20 for connecting the negative electrode side terminal portion 1f on the upper side of the upper electrolytic capacitor 1 and the negative electrode side terminal portion 1f on the upper side of the lower electrolytic capacitor 1 is a common conductor (not shown). They are connected as shown by the broken line.
As a result, these six electrolytic capacitors 1 are all connected in parallel as shown in the connection diagram of FIG.

As shown in FIG. 7, mounting holes 19a are provided at the four corners of the mounting plate 19, respectively, and semiconductor power accommodating the electrolytic capacitor unit is accommodated by mounting bolts (not shown) inserted into the mounting holes 19a. It is fixed to the mounting part of the converter.

Therefore, when replacing the electrolytic capacitor 1 attached to this electrolytic capacitor unit, the mounting bolts inserted into the mounting holes 19a are loosened, and the connecting portion of the terminal portion of the common conductor shown by the broken line is removed. The electrolytic capacitor unit is removed from the semiconductor power converter.

[0015]

However, in the capacitor unit thus constructed, when the electrolytic capacitor 1 is replaced, the connection conductor 20 is removed and then the electrolytic capacitor 1 is fixed to the mounting plate 19. You must remove the pan head machine screw that you are using.

Even in the capacitor unit shown in FIG. 7, these operations involve tightening the screw tightening portions at a total of 36 points (Note: the mounting holes 19a of the mounting plate 19 and the common conductor are excluded). Exchange takes time.

On the other hand, when assembling the electrolytic capacitor unit, the tightening portion is tightened, but in the final stage, when each connecting conductor 20 is tightened to each terminal portion,
Due to the difference between the diameter of the mounting hole formed in each mounting seat 1b and the outer diameter of the pan head machine screw, the position of each laterally arranged terminal portion 1f may slightly vary.

Therefore, the connection hole formed in each connection conductor 20 may not coincide with each terminal portion 20a of each electrolytic capacitor 1. Then, the tip of the fixing screw inserted in the connection hole 20a cannot be screwed into the terminal portion 1f.

Therefore, when assembling this electrolytic capacitor unit, each mounting seat 1 of each electrolytic capacitor 1
The pan head machine screw formed in b from the mounting plate 19 and screwed into the screw hole 1d is temporarily fixed, and the pan head machine screw tightening the convex portion 1c of each electrolytic capacitor 1 is also temporarily tightened. The connection conductors 20 are tightened first, and finally the temporarily tightened tightening portion is tightened.

Then, in FIG. 7, when the convex portion 1c of the electrolytic capacitor 1 located at the central portion is tightened, the tip of the driver cannot be applied at a right angle due to the convex portions of the left and right electrolytic capacitors. , Tightening work becomes difficult, and replacement work takes time.

Therefore, even if the diameter of each connection hole formed in each connection conductor 20 is increased and the positions of the terminal portions of the electrolytic capacitors 1 arranged side by side are slightly displaced, the fixing screw inserted in the connection hole It is also conceivable that the terminal can be screwed into the terminal portion 1f. However, this method cannot be used because the contact area between the connection conductor 20 and the upper surface of the terminal portion 1f is reduced, the contact resistance is increased, and the temperature is increased.

Further, in the structure in which the band-shaped connecting conductor is arranged like the connecting conductor 20 in FIG. 7, the circuit inductance is further reduced, and an obstacle in suppressing the surge voltage during the switching operation of the high speed switching element. Becomes

Therefore, an object of the present invention is to assemble easily,
An object of the present invention is to obtain a capacitor unit that can shorten the work time for replacing the capacitor, reduce the inductance of the circuit, and further suppress the surge voltage during the switching operation of the high-speed switching element.

[0024]

According to a first aspect of the present invention, there is provided a capacitor unit in which a plurality of capacitors each having a pair of terminals protruding from one side are arranged in a row on a mounting plate, and a conductor for connecting the capacitors in parallel is provided. In a capacitor unit arranged on one side of a capacitor, a first conductive plate connected to one of a pair of terminals of the capacitor via a first terminal portion, and a second terminal on the other of the pair of terminals of the capacitor. It is characterized in that a second conductive plate connected via a portion and an insulating plate inserted between the first and second conductive plates are provided.

In the capacitor unit of the invention described in claim 2, the first and second conductor plates are provided on the outer surface side of the first and second conducting plates.
The outer surface insulating plate for sandwiching the conducting plate and the insulating plate via a fastener is additionally provided.

Further, the capacitor unit of the invention according to claim 3 is characterized in that a plurality of columns for holding the capacitor via the outer insulating plate are provided between the first and second conducting plates and the mounting plate. To do.

Further, in the capacitor unit of the invention described in claim 4, the capacitor is an electrolytic capacitor, and a confirmation hole for visually recognizing the explosion-proof valve of the electrolytic capacitor is provided on the first and second conductive plates and the insulating plate and the outer insulating plate. Is formed.

By such means, in the invention described in claim 1, the inductance of the conductor connecting each capacitor is reduced by the first and second conducting plates.

Further, in the invention according to claim 2,
The first and second conducting plates, the insulating plate and the outer surface insulating plate enable collective removal.

Further, in the invention described in claim 3,
Removal of one side of the support bar allows replacement of the capacitor.

Further, in the fourth aspect of the invention, the presence or absence of the operation of the explosion-proof valve of the electrolytic capacitor can be visually confirmed through the confirmation hole.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the capacitor unit of the present invention will be described below with reference to FIGS. FIG. 1 is a front view showing a capacitor unit of the present invention, which corresponds to FIG. 7 shown in the prior art and, like FIG.
6 shows the case where six electrolytic capacitors are connected in parallel.

FIG. 2 is a front view of FIG. 1 and also a view corresponding to FIG. In FIGS. 1, 2 and 3,
On the surface of the mounting plate 3 whose outer shape is substantially the same as that of the mounting plate 13 shown in FIGS. 7 and 8, the studs 4 are formed adjacent to the inside of each mounting hole.
(Note: the broken line shows the outline of the electrolytic capacitor).

A male screw portion (not shown) formed at the lower end of the stud 4 penetrates an insertion hole formed in the mounting plate 3 and is fixed by a nut (not shown) on the rear surface side of the mounting plate 3. On the surface of the mounting plate 3, a pair of strip-shaped rubber plates 5B
Are attached in parallel vertically.

On the surface of the rubber plate 5B, six electrolytic capacitors 1 are arranged vertically in two stages in the same manner as in FIG. 7 with the mounting bracket 1a shown in FIG. 6 being omitted. A rubber plate 5A shown in the perspective view of FIG. 4 is placed on the upper surface of these electrolytic capacitors 1 as shown in FIG. 2, and each electrolytic capacitor and the terminal at the upper end are loosely fitted to this rubber plate 5A. The hole 5a is formed as shown in FIG. 3 showing the AA cross section of FIG. 1 and FIG. 4 (a) showing a partial perspective reduced view of this FIG. Further, at each of the four corners, a cutout portion 5b for avoiding the upper end of the stud 4 and an insulating bolt described later is formed.

On the upper surface of the rubber plate 5A, the rubber plate 5
A collective laminated conductor 2 to be described later, which has a rectangular shape similar to A and has terminal conductors 7A and 7B protruding on the right side, is mounted and fixed to the upper end of each stud 4 by a bolt 15. The collectively laminated conductor 2 and the rubber plate 5A are previously joined to each other before being fixed to the upper surface of the electrolytic capacitor 1.

In the collectively laminated conductor 2, FIG. 3 and a partially enlarged view of FIG. 3 are shown in advance with respect to the positions where the conduit collars 11A, 11B, 11C and 11D correspond to the positions of the terminal portions 1f of the electrolytic capacitor 1. As shown in FIG. 4B, it is provided so as to penetrate from both sides, and after the collective laminated conductor 2 is placed, it is fastened to the terminal portions 1p and 1n of each electrolytic capacitor 1 with bolts 6A.

That is, in FIG. 3, on the upper side of the positive electrode terminal 1p protruding from the upper ends of the left and right electrolytic capacitors 1, a conduit collar 11A is provided from above to a pair of connection holes formed in the positive electrode conducting plate 7A. As shown in FIG. 4B, the stepped portion 11a
It is press-fitted through.

This conduit collar 11A has this conduit collar
From the lower side of 11A, a conduit collar 11C is press-fitted through a stepped portion 11c, and these conduit collars 11A and 11B are press-fitted to each other by a concavo-convex portion formed in the facing portion. Further, the conduit collars 11B and 11D are also press-fitted into the negative electrode conducting plate 7B from above and below into the connection holes at positions corresponding to the negative electrode terminal 1n of the electrolytic capacitor 1.

FIG. 5 is an exploded reduced perspective view of the collective laminated conductor 2 shown in FIGS. 1, 2 and 3, and shows the uppermost insulating plate 8A.
And the lower positive electrode conducting plate 7A and the lower insulating plate 8
B, the negative electrode conducting plate 7B and the lowermost insulating plate 8C, and the conduit collars 11A, 11B, 11C and 11D penetrating the insulating plate 8C. Of these, the uppermost insulating plate 8A, the middle insulating plate 8B, and the lowermost insulating plate 8C are completely the same and have the same outer shape as the rubber plate 5A.

These insulating plates 8A, 8B and 8C have the above-mentioned conduit collars 11A, 11B, 11C and 11D at the positions corresponding to the terminals 1p and 1n of the electrolytic capacitors 1 as shown in FIG. A hole 16 that is loosely fitted in is formed.

Further, bolt holes 12 into which the bolts 15 for fixing the collective laminated conductor 2 to the upper ends of the studs 4 are inserted are formed in each of the four corners, and inside the bolt holes 12 shown in FIG. A tightening hole 13 into which the illustrated insulating bolt 14 is inserted is formed. Further, on the outer periphery of the lower ends of the bolt hole 12 and the tightening hole 13, a convex portion having the same thickness as that of the positive electrode conducting plate 7A is formed. In addition, at the position corresponding to an explosion-proof valve (not shown) provided at the upper end of each electrolytic capacitor 1, a confirmation hole 17
Is provided.

The positive electrode conducting plate 7A has a terminal portion 7 on the right front side.
a is protrudingly provided, the width and depth of the rectangular portion excluding the terminal portion 7a are shorter than those of the insulating plates 8A, 8B, and 8C, and the terminal hole 9A is formed in the central portion of the terminal portion 7a. A confirmation hole 17 is formed on the left side of 9A.

A conduit collar 11A is inserted from above into a slightly smaller diameter connection hole formed at a position corresponding to the positive electrode side terminal portion of the upper and lower electrolytic capacitors 1, and a long conduit is inserted into this conduit collar 11A. The collar 11C is pressed in from below.

A confirmation hole 17 is provided at a position facing the explosion-proof valve of the left and center electrolytic capacitors 1. At a position corresponding to the lower part on the right side of the electrolytic capacitor 1 at the left end of the lower stage, a terminal portion which is not shown in the drawing and has an L-shape in a right side view is provided to project, and a terminal hole 9B is formed in the center of the terminal portion. There is.

On the other hand, the negative electrode conducting plate 7B is provided with a terminal portion 7b protruding rearward on the right side, and the width and depth of the rectangular portion excluding the terminal portion 7b are the same as those of the upper positive electrode conducting plate 7A, A terminal hole 10A is formed in the center of the portion 7b.
A confirmation hole 17 is formed on the left side of A.

A conduit collar 11B is inserted from above into a slightly smaller diameter connection hole formed at a position corresponding to the terminal portion on the negative electrode side of the upper and lower electrolytic capacitors 1, and a short conduit is inserted in this conduit collar 11B. Collar 11D is pressed in from below.

A confirmation hole 17 is provided at a position facing the explosion-proof valve of the left and center electrolytic capacitors 1. At the position corresponding to the lower part on the left side of the electrolytic capacitor 1 at the right end of the lower stage, an L-shaped terminal portion, which is not shown in the right side view, is provided in a protruding manner, and a terminal hole 10B is formed in the center of this terminal portion. There is.

The collective laminated conductor 2 having the insulating plates 8A, 8B and 8C, the positive electrode conducting plate 7A and the negative electrode conducting plate 7B as described above.
After being tightened with insulating bolts 14 inserted into the respective tightening holes 13, they are placed on the six electrolytic capacitors 1 and fixed to the upper ends of the studs 4 with bolts 15.

Next, the bolt 6A shown in FIG. 1 is inserted into the conduit collars 11A and 11B, and these conduit collars 11A and 11B are fastened to the respective terminal portions 1p and 1n, whereby the positive electrode conductor 7A is Terminal part 1p of electrolytic capacitor 1
Connected to. Similarly, the negative electrode conducting plate 7B is connected to the terminal portion 1n of each electrolytic capacitor 1, and as a result, each electrolytic capacitor 1 is connected in parallel.

In the capacitor unit thus constructed, the terminals of each electrolytic capacitor 1 are collectively laminated conductor 2
When connecting the positive electrode conducting plate 7A and the negative electrode conducting plate 7B, first, the respective conduit collars 11C and 11D are fixed to the terminals of the electrolytic capacitor 1 by inserting the bolts 6A.

Next, the intermediate assembly unit in which the collective laminated conductor 2 and the electrolytic capacitor 1 are assembled is placed on the mounting plate 3 to which one side of each stud 4 is fixed by attaching the rubber plate 5B in advance, and each is mounted by the bolts 15. The studs 4 are tightened, and each capacitor 1 is held between the rubber plate 5B attached to the mounting plate 3 and the rubber plate 5A attached to the collective laminated conductor 2.

When exchanging the electrolytic capacitor 1, the bolts 15 fastening the collective laminated conductor 2 and the stud 4 are removed, and then the collective laminated conductor 2 is attached to the terminal portions 1p and 1n of each electrolytic capacitor 1. Conduit collar 11A, 11B, 11C,
By removing the bolt 6A that is tightening 11D, each electrolytic capacitor is removed, and a new capacitor 1 is installed according to the above procedure.

Therefore, in the capacitor unit thus constructed, the mounting metal fitting 1a shown in FIGS. 7 and 8 need not be used.
The processing of the female screw hole for the mounting plate 3 for fixing the electrolytic capacitor 1 via the is unnecessary.

In addition, without using the mounting metal fitting 1a, each electrolytic capacitor 1 has the conduit collars 11A, 11 of the collectively laminated conductor 2.
Since only each terminal is screwed first through B, 11C and 11D, the temporary fixing of the convex portion 1c of the mounting bracket 1a and the temporary fixing work of each mounting seat like the conventional electrolytic capacitor unit are omitted. be able to. Furthermore, since the number of tightening portions can be reduced to 24, which is two-thirds of the conventional one, assembling time is shortened.

Further, in the conventional electrolytic capacitor unit, by omitting the mounting metal fitting 1a required for fixing the electrolytic capacitor, the mounting intervals of the electrolytic capacitors can be made close to each other, and the outer shape can be made compact. By making the positive electrode conductor plate 7A and the negative electrode conductor plate 7B connected to the electrolytic capacitor and the insulating plates 8A, 8B, 8C into a unitary laminated conductor 2, the length of the conductor connecting the electrolytic capacitor can be minimized. Therefore, the inductance of the wiring can be reduced, and the surge voltage during high-speed switching operation can be suppressed.

Since each electrolytic capacitor 1 is fixed to the mounting plate 3 by the lumped laminated conductor 2 and the stud 4 via the rubber plate 5A whose upper end surface is pressed, the conventional method of fixing only the lower side can be adopted. In comparison, since it can be firmly fixed to the mounting plate 3, it has a structure that is strong against vibrations received during transportation.

In addition, the explosion-proof valve confirmation hole 17 is provided in the batch laminated conductor 2.
Is provided, it is possible to visually confirm deterioration of the electrolytic capacitor at the time of inspection and to position the electrolytic capacitor in the direction of the polarity of the electrolytic capacitor at the time of assembly. Furthermore, since the collectively laminated conductor 2 covers the entire outer periphery of the electrolytic capacitor, it is possible to omit the explosion-proof cover after being incorporated in the power conversion device.

In the above embodiment, the plate-shaped positive electrode conducting plate 7 is used.
Although A and the negative conductor plate 7B and a plurality of insulators are stacked to form a collective laminated conductor, a laminated conductor in which an insulating layer is coated on the surface of each conductor plate may be used without using an individual insulating sheet.

In the above embodiment, the case of electrolytic capacitors connected in parallel has been described. However, in the case of series / parallel mixed connection, the number of stacked conductor plates is increased to form a multi-layer collectively laminated conductor. You can deal with it.

Further, in the above embodiment, the conduit collar 11
The case where the A and 11C and the conduit collars 11B and 11D are joined by press fitting of the uneven portion has been described.
The concavo-convex portion for press-fitting may be omitted, the surface may be flat and may be joined by brazing, or the connection to each conductive plate may be brazing.

Further, in the above embodiment, the electrolytic capacitor 1
In the above description, 6 are connected in parallel, but the number of parallel connections may be 2 or 4, and the invention can be applied regardless of the number of parallel connections.

Further, in the above embodiment, the case of the electrolytic capacitor unit has been described, but the purpose is to facilitate the assembly / replacement and reduce the inductors of the conductors connected in parallel regardless of the type of the capacitor. Any capacitor unit can be applied.

[0064]

As described above, according to the first aspect of the present invention,
In a capacitor unit in which a plurality of capacitors, each of which has a pair of terminals protruding from one side, are arranged in a row on a mounting plate, and a conductor for connecting the capacitors in parallel is disposed on one side of the capacitor A first conductive plate connected via the first terminal portion, a second conductive plate connected to the other of the pair of terminals of the capacitor via the second terminal portion, and first and second conductive plates. By providing the insulating plate inserted between the plates, the inductance of the conductor connecting each capacitor is reduced by the first and second conductive plates, so that the assembly is easy and the work time for replacement can be shortened. Further, it is possible to obtain a capacitor unit that can further reduce the circuit inductance and further suppress the surge voltage during the switching operation of the high-speed switching element.

According to the second aspect of the invention, the outer surface insulation is provided on the outer surface side of the first and second conducting plates, and the first and second conducting plates and the insulating plate are sandwiched by fasteners. By attaching the plate, the first and second conducting plates, the insulating plate, and the outer insulating plate can be collectively removed, so that the assembly is easy and the work time for replacement can be shortened. It is possible to obtain a capacitor unit that can further reduce the circuit inductance and further suppress the surge voltage during the switching operation of the high-speed switching element.

According to the third aspect of the present invention, by providing a plurality of columns for holding the capacitor via the outer insulating plate between the first and second conducting plates and the mounting plate, the support rod Since the capacitor can be replaced by removing one side, it is easy to assemble and the work time for replacement can be shortened, and the circuit inductance can be made smaller, and the switching operation of the high-speed switching element can be reduced. It is possible to obtain a capacitor unit that can further suppress the surge voltage.

Further, according to the fourth aspect of the present invention,
Confirm whether the explosion-proof valve of the electrolytic capacitor is working or not by forming a confirmation hole for visually recognizing the explosion-proof valve of the electrolytic capacitor on the first and second conductive plates, the insulating plate and the outer insulating plate as the capacitor. Since it is visible from the hole, it is easy to assemble, the work time for replacement can be shortened, the circuit inductance can be made smaller, and the surge voltage during the switching operation of the high-speed switching element can be further suppressed. A possible capacitor unit can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a capacitor unit of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

4A is a reduced perspective view showing the rubber plate 5A shown in FIGS. 1, 2 and 3. FIG. (B) is an enlarged sectional view showing an assembled state of the conduit collars 11A, 11B, 11C, 11D shown in FIG.

FIG. 5 is a partially exploded reduced perspective view of FIGS. 1, 2 and 3.

FIG. 6 is a connection diagram showing an example of a conventional capacitor unit.

FIG. 7 is a front view showing an example of a conventional capacitor unit.

FIG. 8 is a front view of FIG. 7;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electrolytic capacitor, 1p, 1n ... Terminal part, 2 ... Collective laminated conductor, 3 ... Mounting plate, 4 ... Stud, 5A, 5B ... Rubber plate, 5a, 16 ... Hole, 6A, 15 ... Bolt, 7A ... Positive conductor Plate, 7B ... Negative electrode conducting plate, 8A, 8B, 8C ... Insulating plate, 9
A, 9B, 10A, 10B ... Terminal hole, 11A, 11B, 11C, 11
D ... Conduit collar, 12 ... Bolt hole, 13 ... Tightening hole, 14 ... Insulation bolt, 17 ... Confirmation hole, 18 ... Conduit hole.

Claims (4)

[Claims] 1. A capacitor unit in which a plurality of capacitors, each of which has a pair of terminals protruding from one side, are arranged in a row on a mounting plate, and a conductor connecting the capacitors in parallel is disposed on one side of the capacitor. A first conducting plate connected to one of the pair of terminals via a first terminal portion, and a second conducting plate connected to the other of the pair of terminals of the capacitor via a second terminal portion. And an insulating plate inserted between the first and second conducting plates. 2. An outer surface insulating plate for sandwiching the first and second conductive plates and the insulating plate via a fastener is additionally provided on the outer surface side of the first and second conductive plates. The capacitor unit according to claim 1. 3. The capacitor according to claim 2, wherein a plurality of columns for holding the capacitor via the outer insulating plate are provided between the first and second conducting plates and the mounting plate. unit. 4. The electrolytic capacitor is used as the capacitor,
The capacitor unit according to claim 3, wherein a confirmation hole for visually recognizing the explosion-proof valve of the electrolytic capacitor is formed in the first and second conducting plates, the insulating plate, and the outer insulating plate.