JPH07131953A - Air cooling structure of electrical power apparatus - Google Patents

Abstract

PURPOSE:To improve air cooling efficiency and moreover improvement in reliability of the apparatus itself for heating generating parts stored in the electrical power apparatus. CONSTITUTION:The inside of a case 2 is divided into two chambers including a front and a rear chambers with a partition 3 which is provided almost in the vertical direction and a heat generating element 8 and a transformer reactor 10 are arranged dispersely in each divided chamber. At the upper portions of respective chambers, exhaust fans 11, 12 are respectively provided and thereby the lower part of front chamber is communicated with a ventilation hole 1a and the lower part of rear chamber is communicated with a ventilation hole 1b at the lowest portion of the front droor 1 through a communication path 5. Therefore, heat generated by elements 8 and transformer reactor 10 arranged dispersely in unit of the front and rear chambers is forced and accelerated to circulate with each exhaust fan 11, 12 together with the air flow by the natural convection and is then released to the outside through the air flow which is introduced from the lower portions of chambers, rises upward at the inside of chambers and is then exhausted from the upper portion thereof, resulting in the effective coiling of the apparatus by air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of heat source regions in which heat generating components such as a transformer, a reactor and an insulated gate bipolar transistor (IGBT) are centrally arranged inside a casing of a power device such as an uninterruptible power supply. The present invention relates to an air-cooling structure for forming electric power, and particularly to an air-cooling structure of a power device capable of improving air-cooling efficiency.

[0002]

2. Description of the Related Art A conventional example is shown in FIG.
Will be described with reference to FIG. In FIG. 3, the front door 1 is attached to the rectangular parallelepiped case 2 such that its opening can be opened and closed. 2a is a base for installing the case on the floor. Inside case 2,
The input / output unit 6 is arranged at the lower part on the front side (left side in the figure), the power conversion unit 7 is arranged at the upper part on the front side, and the transformer / reactor unit 10 is arranged at the lower part on the rear side. The input / output unit 6 is a box-shaped operation unit mainly composed of a breaker, a magnet contactor, and the like, and is therefore arranged on the front side for operation. The power conversion unit 7 is
An insulating bipolar transistor element (hereinafter simply referred to as an element) 8 which is a switching element and a capacitor (not shown) are centrally arranged on a mounting plate 9 with fins for air cooling. Since the element 8 and the capacitor generate a relatively large amount of heat, they are arranged on the upper portion. The transformer / reactor unit 10 is also a heat generating unit, but it is placed in the lower rear portion because it is a heavy load and requires relatively little maintenance.

External air is taken in through a ventilation hole 1c formed in the lower portion of the front door 1 mainly for the dissipation of heat generated from the element 8 and the capacitor and the transformer / reactor portion 10. In FIG. 4, the ventilation hole 1c indicated by the alternate long and short dash line is
Actually, it is on the side of the front door 1 and shows the position when the front door 1 is closed. It should be noted that the external air taken in from the ventilation hole 1c is removed of dust and the like contained through a filter (not shown) provided on the back side of the front door 1. By the way, the external air taken in rises by convection while contacting with the heat-generating part described above and absorbing heat.
It is released upward from the hole in the ceiling. The exhaust fan 13 attached to the ceiling part forcibly and promotes the rise of the air flow. In addition to the ventilation holes 1c in the lower part of the front door 1, no ventilation holes are usually provided on the side surface or the back surface side of the case 2. The reason is that the cases of the electric power devices may be arranged side by side in the lateral direction to form a so-called row board, or the wall surface may be installed close to the back side of the case.

[0004]

In the conventional example, the mounting plate 9 is used.
The rising air that comes into contact with the fins of the
Since the heat is taken away at the reactor portion 10, the temperature has already risen by about 10 degrees. Therefore,
The fins of the mounting plate 9 must be made larger to enhance the air cooling effect. However, this would increase the occupied space, leading to a larger case 2, which is a problem. On the other hand, if the fins of the mounting plate 9 are left as they are, the life of the element 8, the capacitor, and the transformer / reactor portion 10 will be shortened.

The problem to be solved by the present invention is to solve the above problems of the prior art and to provide an air-cooling structure for a power device which can improve the air-cooling efficiency and thus the device reliability. .

[0006]

In an air-cooling structure for a power unit according to a first aspect of the present invention, a plurality of heat source regions are formed by centrally arranging heat-generating components inside a housing in which a main body of the power unit is housed. This is an air-cooled structure in which the inside of the housing is partitioned by almost vertical partition walls, the heat source region is distributed and arranged, and the lower part of each compartment communicates with the outside air; and the upper part of each compartment. And an exhaust fan.

According to a second aspect of the present invention, there is provided an air-cooling structure for an electric power device according to the first aspect, wherein the lower portions of the respective compartments communicate with ventilation holes provided in the front wall of the housing. An air-cooling structure of a power device according to claim 3 is the air-cooling structure according to claim 1 or 2, wherein the inside of the housing is provided with one partition wall,
It is divided into each rear compartment, and the lower space of the raised bottom plate provided at the bottom of the front compartment forms a communication passage that leads to the lower part of the rear compartment from the ventilation holes formed in the front wall of the lower housing. To do.

[0008]

In the air-cooling structure for an electric power unit according to any one of claims 1 to 3, the inside of the housing is partitioned by a substantially vertical partition wall to be divided into a plurality of compartments, and the heat source regions are dispersedly arranged in each of the compartments. To be done. The lower part of each of these compartments communicates with the outside air,
An exhaust fan is provided on the top. Therefore, in each branch unit, the heat generated in the heat source areas dispersed therein is combined with the air flow by natural convection, and the air flow introduced by the exhaust fan from the lower part of the compartment and rising in the inner part of the compartment and discharged from the upper part. The heat is radiated to the outside via the air, that is, it is cooled by air.

Particularly, in the air-cooling structure of the power unit according to the second aspect, since the lower portion of each compartment communicates with the ventilation hole provided in the front wall of the housing, each compartment has its lower front face by an exhaust fan. Outside air is sucked in through the ventilation holes on the wall,
An air stream is generated that rises inside and is exhausted from the top. Particularly, in the air-cooling structure for the electric power device according to claim 3, in the front compartment, the exhaust fan sucks the outside air from the ventilation hole of the lower front wall of the front compartment, and the air flow that rises inside and is discharged from the upper part. In the rear compartment, the exhaust fan draws in outside air from the ventilation holes in the front wall of the lower part of the housing, and goes up the interior of the rear compartment through the communication passage leading to the lower part of the rear compartment and is discharged from the upper part. Air flow is generated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of an air cooling structure of a power device according to the present invention will be described below with reference to the drawings. Description will be given with reference to the side view of FIG. 1 and the front view of FIG. 2 when the front door is opened. This embodiment is different from the conventional example in that the inside of the case 2 is divided into two compartments, a front compartment and a rear compartment, by a partition wall in a substantially vertical direction, and an element 8 as a heat generating portion and a capacitor (not shown) are provided. In front of the transformer / reactor unit 10,
Distributing and arranging them in each of the rear compartments, in two, exhaust fans 11 and 12 are installed in the upper part of each compartment, and in three, the lower part of the front compartment is communicated with the ventilation hole 1a, The lower part of the rear compartment and the ventilation hole 1b at the bottom of the front door 1 are connected to each other by a communication passage 5
It is to communicate through. That is, the bottom plate of the front compartment is raised to form the bottom plate 4, and the communication passage 5 communicating with the lower part of the rear compartment is formed below the bottom plate. Other members that are the same as those in the conventional example are denoted by the same reference numerals.

Therefore, the heat generated by the element 8, the condenser (not shown), and the transformer / reactor section 10, which are dispersedly arranged in each of the front and rear compartments, together with the air flow due to natural convection, are exhausted. It is forced and promoted by the fans 11 and 12, and is radiated to the outside, that is, air-cooled, through the airflow introduced from the lower part of each compartment and rising in the interior of the compartment and discharged from the upper part. Each ventilation hole 1a,
The reason why 1b is provided only on the lower portion of the front door 1 and not on the side surface or the rear surface side of the case 2 is for the same reason as described in the conventional example.

[0012]

In the air-cooling structure of the electric power unit according to any one of claims 1 to 3, the inside of the housing is partitioned by a substantially vertical partition wall to be divided into a plurality of compartments, and the heat source area is provided in each of the compartments. Distributed. The lower part of each of the compartments communicates with the outside air, and the exhaust fan is provided on the upper part. Therefore,
In each compartment, the heat generated in the heat source area distributed there is distributed through the air flow by natural convection and the air flow introduced by the exhaust fan from the lower part of the compartment and rising inside the compartment and discharged from the upper part. Heat is radiated to, that is, air cooled. As a result, in each of the compartments, the heat generated in the heat source area distributed therein is separated from the heat generated in the heat source areas of the other compartments and radiated by natural convection and forced air flow.
Since it is air-cooled, the air-cooling efficiency can be improved and the device reliability can be improved.

Particularly, in the air-cooling structure of the electric power device according to the second aspect, since the lower portion of each compartment communicates with the ventilation hole provided in the front wall of the housing, each compartment has its lower front face by an exhaust fan. Outside air is sucked in through the ventilation holes on the wall,
An air stream is generated that rises inside and is exhausted from the top. Therefore, even when a plurality of casings are arranged side by side in the lateral direction, that is, in a so-called row board structure, or when a common wall surface is installed close to the back surface, air cooling can be performed without any trouble.

Particularly, in the air-cooling structure of the electric power device according to the third aspect, in the front compartment, the exhaust fan sucks the outside air from the ventilation hole of the lower front wall of the front compartment, rises inside, and is discharged from the upper part. Air flow is generated, and in the rear compartment,
By the exhaust fan, the outside air is sucked through the ventilation holes in the front wall of the lower part of the housing, rises in the rear compartment through the communication passage leading to the lower part of the rear compartment, and the airflow discharged from the upper part is generated. In practice, the sub-compartment is divided into two compartments at the front and rear, but this is often convenient in terms of structure and arrangement of heat-generating components.
For example, an IGBT element that has a relatively large amount of heat generation and requires operation and maintenance from the front side is located near the upper part of the front compartment and has a relatively small amount of heat generation that requires little operation and maintenance, but a heavy transformer. Reactors, etc.
It is located in the lower part of the rear compartment. Further, as in the case of claim 2, even when a plurality of casings are arranged side by side in the lateral direction, that is, a so-called row board configuration and a common wall surface is installed close to the back surface, air cooling is a hindrance. Done without.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment according to the present invention.

FIG. 2 is a front view of the embodiment when the front door is opened.

FIG. 3 is a side view of a conventional example.

FIG. 4 is a front view when a front door of a conventional example is opened.

[Explanation of symbols]

 1 Front Door 1a, 1b Ventilation Hole 2 Case 2a Base 3 Partition 4 Raised Bottom Plate 5 Communication Passage 6 Input / Output 7 Power Converter 8 Element (IGBT) 9 Finned Mounting Plate 10 Transformer / Reactor 11, 12 Fan

Claims (3)

[Claims] 1. An air-cooling structure in which a plurality of heat-source regions are formed by centrally arranging heat-generating components inside a housing in which a main body of an electric power device is housed, wherein the inside of the housing is substantially vertical. The air-cooling of the electric power device, characterized in that each of the compartments is divided by a plurality of compartments, the heat source areas are arranged in a distributed manner, and a lower portion communicates with the outside air; and an exhaust fan provided on the upper portion of each compartment. Construction. 2. The air cooling structure according to claim 1, wherein a lower part of each compartment communicates with a ventilation hole provided in a front wall of the housing. 3. The air-cooled structure according to claim 1 or 2, wherein the inside of the housing is divided into front and rear compartments by one partition, and the raised bottom plate is provided at the bottom of the front compartment. An air-cooling structure for an electric power device, wherein the lower space forms a communication passage that communicates with a lower portion of the rear compartment from a ventilation hole formed in the front wall of the lower housing.