JPH0923079A - Power converting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a power converting equipment which saves the maintenance working hour of smoothing capacitors and cooling fans which necessitate maintenance. SOLUTION: A plurality of semiconductor switching elements, and snubber capacitors which are connected with the semiconductor switching elements are arranged on a cooling body. Smoothing capacitors serving as a power supply, a first cooling fan for cooling the smoothing capacitors and the inside of an equipment, and a second cooling fan for cooling the cooling body are at least installed in this power converting equipment. From the upper part of the equipment, the following are arranged in order; the first cooling fan 2, the smoothing capacitors 3, the semiconductor switching elements 7, and the second cooling fan 10. The semiconductor switching elements 7 provided with snapper capacitors are arranged in a zigzag type on the cooling body. A metal fixture for fixing the smoothing capacitors are L-shaped. The smoothing capacitors are fixed on the vertical plane of the L-shaped metal fixture, and the first cooling fan is fixed on the horizontal plane. The first cooling fan is so fixed to the L-shaped metal fixture that three sides out of peripheral four sides are used as guides and the left side is pressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power conversion device, and more particularly to arrangement of parts thereof.

[0002]

2. Description of the Related Art FIG. 7 is a side sectional view showing the structure of a conventional power converter, and FIG. 8 is a sectional view taken along the line BB of FIG.
7 and 8, the semiconductor switch element 7, the smoothing capacitor 3, the first cooling fan 2, the rectifier 9, and the second cooling fan 10 are arranged in this order from the top, and the base for driving the base is provided on the front surface of the semiconductor switch element 7. The printed board 12,
A control printed board 13 is arranged in front of the rectifier 9, a fuse 5 is arranged in front of the smoothing capacitor 3, and an electromagnetic contactor 11 is arranged beside the rectifier 9.

Fuse 5, rectifier 9 and electromagnetic contactor 1
Since the function of No. 1 is not directly related to the present invention, description of its application and function will be omitted. The semiconductor switching element 7 has four parallels for one phase and a total of twelve sets of these are arranged side by side for three phases. The smoothing capacitor 3 connects the cooling body 6 for the semiconductor switching element 7 and the cooling body 6A for the rectifier 9 to the frame 15
Attached via a mounting band not shown above,
The first cooling fan 2 has a cooling body 6A through an L-shaped metal fitting 21.
It is screwed to.

A third cooling fan 22 is provided for cooling the printed board.

[0005]

The structure of such a conventional power converter has the following problems. (A) To remove the smoothing capacitor and the cooling fan that require maintenance because they are parts with a finite life, between the semiconductor switch element 7 and the smoothing capacitor 3, between the rectifier 9 and the smoothing capacitor 3, and the front surface of each. Since there is a wiring connection bar (not shown), it is necessary to disassemble and remove this wiring connection bar, and it takes time for maintenance work. If the wiring connection bar is divided to reduce the maintenance work time, the number of parts increases.

(B) Since the smoothing capacitor 3 is arranged between the semiconductor switch element 7 and the rectifier 9, the cooling body becomes larger than necessary unless it is divided, and the cooling efficiency is poor. Further, since the base driving printed board 12 and the control printed board 13 are separated from each other, the wiring between the printed boards becomes long. (C) Since four semiconductor switch elements 7 are arranged in parallel for one phase and are arranged side by side for three phases, the lateral width of the device becomes large.

(D) The first cooling fan 2 is suitable for cooling the smoothing condenser because the cooling air is blown directly to the smoothing condenser 3, but it is less effective for cooling the entire inside of the apparatus, and therefore is less effective. It is necessary to provide a third cooling fan 22 for cooling the part. SUMMARY OF THE INVENTION An object of the present invention is to provide a power conversion device that shortens the maintenance work time of a smoothing capacitor and a cooling fan that require maintenance because they have a limited life.

[0008]

A smoothing capacitor, in which a plurality of semiconductor switching elements and snubber capacitors connected to these semiconductor switching elements are arranged on a cooling body and serves as a power source, and the smoothing capacitor and the device In a power conversion device including at least a first cooling fan that cools the inside and a second cooling fan that cools the cooling body, a first cooling fan, a smoothing capacitor, and a semiconductor switch element from the top of the device. , The second cooling fan is arranged in that order.

Further, the semiconductor switch elements having snubber capacitors are arranged in a staggered manner on the cooling body. Further, the shape of the mounting bracket for mounting the smoothing capacitor is L-shaped, and the smoothing capacitor is mounted on the surface of the L-shaped cooling body parallel to the semiconductor switch element mounting surface, and the surface perpendicular to the semiconductor switching element mounting surface of the cooling body. Attach the first cooling fan to. The first cooling fan is attached to the L-shaped mounting bracket by guiding the three sides of the four sides of the first cooling fan.
Hold down the remaining side and fix.

[0010]

According to the structure of the present invention, when the smoothing condenser or the first cooling fan is replaced, there is no obstacle such as a wiring connection bar on the front surface and the work surface is close to the front surface side of the apparatus, so that workability is improved. Is good. Further, the replacement of the first cooling fan may be performed by removing only one pressing metal fitting that fixes the periphery of this fan.

Further, since the semiconductor switching elements are arranged in a staggered pattern, the flow of cooling air around the semiconductor switching elements is good, the cooling effect of the semiconductor switching elements can be enhanced, and the lateral dimension of the device can be reduced. Since the semiconductor switch element and the rectifier are close to each other, the cooling body does not need to be made larger than necessary, so that the cooling efficiency is high, and the first cooling fan is located at the top to attract the cooling air. The heat-generating components inside the device are cooled almost uniformly.

[0012]

1 is a side sectional view showing the structure of an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a sectional view of FIG. 1 taken along the line A--A, and FIG. 4 is a semiconductor to which a snubber capacitor is connected. It is a perspective view of a switch element. The arrows of the cooling fans 2 and 10 indicate the direction of cooling air. The wiring connection bar is not shown in all the drawings.

1, FIG. 2, FIG. 3 and FIG. 4, the first cooling fan 2, the smoothing capacitor 3,
The fuse 5, the semiconductor switch element 7, the rectifier 9, and the second cooling fan 10 are arranged in this order, and the base drive printed board 12, the control printed board 13, and the electromagnetic contactor 11 are provided in front of the semiconductor switch element 7 and the rectifier 9. Place and. Since the functions of the fuse 5, the rectifier 9 and the electromagnetic contactor 11 are not directly related to the present invention, description of their applications and functions will be omitted.

On the cooling body 6, the semiconductor switching device 7 having the snubber capacitor 8 shown in FIG. 4 is divided into 4 phases for 1 phase as shown in FIG. Are arranged in a staggered pattern. With this arrangement, the first cooling fan 2 located at the uppermost portion attracts the cooling air, so that the heat-generating components including the snubber condenser 8 inside the device are cooled substantially uniformly.

FIG. 5 shows a smoothing capacitor 3 according to an embodiment of the present invention.
FIG. 6 is a perspective view showing a mounting configuration of the mounting bracket 4 and the first cooling fan 2, and FIG. 6 is a completed assembly view of the first cooling fan 2. In FIG. 1, the mounting bracket 4 for mounting the smoothing capacitor 3 has an L shape, and the smoothing capacitor 3 is mounted on a surface of the cooling body 6 parallel to the semiconductor switch element mounting surface 6B. A ventilation hole of the first cooling fan 2 is provided on a surface perpendicular to 6B, and the periphery of the first cooling fan 2 is sandwiched and fixed here.

In FIGS. 5 and 6, the first cooling fan 2 includes a fan receiving plate 17, a right fan partition plate 18, a left fan partition plate 19, and a fan middle partition plate 20, each of which is the outer periphery of the first cooling fan 2. The first cooling fan 2 can be attached / detached by removing the one fan pressing plate 16 as a structure in which the three sides are guided and the remaining one side is pressed and fixed by the fan pressing plate 16.

[0017]

According to the present invention, the maintenance work time of the smoothing capacitor and the cooling fan, which require maintenance due to the limited life of the parts, is shortened, and the system downtime is shortened. Further, since the semiconductor switch element and the rectifier are arranged close to each other, it is not necessary to make the cooling body larger than necessary, and since the semiconductor switch elements are arranged vertically, the lateral width of the device is reduced and the device can be downsized.

The parts of the smoothing condenser and the first cooling fan are made into blocks, and the parts can be separately assembled and incorporated into the apparatus, thereby streamlining the manufacturing process. Such arrangement of the cooling fans contributes not only to cooling the smoothing condenser but also to cooling the entire inside of the apparatus, and the number of cooling fans inside the apparatus can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a configuration of an embodiment of the present invention.

FIG. 2 is a front view showing the configuration of an embodiment of the present invention.

FIG. 3 is a cross-sectional view of FIG. 1 viewed from AA.

FIG. 4 is a perspective view of a semiconductor switch element to which a snubber capacitor is connected.

FIG. 5 is a perspective view showing a mounting structure of a smoothing capacitor mounting bracket and a first cooling fan according to an embodiment of the present invention.

FIG. 6 is a completed assembly diagram of the first cooling fan.

FIG. 7 is a side sectional view showing a configuration of a conventional example.

FIG. 8 is a cross-sectional view of FIG. 7 viewed from BB.

[Explanation of symbols]

 2 First cooling fan 3 Smoothing capacitor 4 Mounting bracket 5 Fuse 6 Cooling body 7 Semiconductor switch element 8 Snubber capacitor 9 Rectifier 10 Second cooling fan 11 Electromagnetic contactor 12 Base drive printed board 13 Control printed board 16 Fan holder Plate 17 Fan receiving plate 18 Fan right partition plate 19 Fan left partition plate 20 Fan middle partition plate

Claims (4)

[Claims] 1. A smoothing capacitor having a plurality of semiconductor switching elements and a snubber capacitor connected to these semiconductor switching elements arranged on a cooling body and serving as a power source, and cooling the smoothing capacitor and the inside of the apparatus. A first cooling fan and a second cooling fan for cooling the cooling body, and a first cooling fan, a smoothing capacitor, a semiconductor switch element, and a second cooling fan from the top of the device. An electric power conversion device characterized in that cooling fans are arranged in this order. 2. The power converter according to claim 1, wherein the semiconductor switch elements having snubber capacitors are arranged in a staggered pattern on the cooling body. 3. The mounting metal fitting according to claim 1, wherein the mounting metal fitting for mounting the smoothing capacitor is L-shaped, and the smoothing capacitor is provided on a surface parallel to the semiconductor switch element mounting surface of the L-shaped cooling body. An electric power conversion device characterized in that a first cooling fan is attached to a surface of the cooling body which is perpendicular to the semiconductor switch element mounting surface. 4. The mounting of the first cooling fan according to claim 3, wherein the L-shaped mounting bracket guides the three sides of the four sides of the first cooling fan and holds the remaining one side. The power conversion device is characterized in that it is fixed.