JP2000228593A - Uninterruptible power supply cooling structure - Google Patents

Abstract

(57) [Summary] Even when an uninterruptible power supply is stacked on a transformer device, the size of the transformer device can be prevented from increasing without reducing the reliability of the device. It is to make. SOLUTION: An uninterruptible power supply box 30 accommodating an uninterruptible power supply 10 is stacked on a transformer apparatus box 31 accommodating a power supply side transformer 6, a load side transformer 7, and a transformer cooling fan 8, and The bottom plate of the uninterruptible power supply box 30 so that the power transformer 6 and the load transformer 7 housed in the transformer box 31 can be cooled by the operation of the power converter cooling fan 14 installed in the power supply box 30. Is opened at the same position as the air inlet of the transformer device box 5 and the air outlet of the ceiling of the transformer box 5. Even if the transformer cooling fan 8 is stopped, the transformer can be cooled by the power converter cooling fan 14. Therefore, even if the number of transformer cooling fans 8 to be installed is reduced and the device is downsized, the reliability does not decrease.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for an uninterruptible power supply which can cool each of the above-mentioned transformers with a cooling fan of the uninterruptible power supply having transformers on a power supply side and a load side.

[0002]

2. Description of the Related Art Conventionally, computer systems in factories and offices are mainly systems in which central processing is performed by a small number of large computers, but recently, a large number of small computers are installed in various places to perform distributed processing. The system has changed. By the way, the biggest weakness of computers is that power supply is cut off even now and for a long time. Therefore, when installing a computer, an uninterruptible power supply is essential.

FIG. 2 is a main circuit connection diagram showing a general configuration of an uninterruptible power supply. AC power from a commercial power supply 2 is supplied to a computer 9 via an uninterruptible power supply 10. Here, the uninterruptible power supply 10 includes a rectifier 11 as a power converter, an inverter 12 as a load converter,
It comprises a battery 13, a converter cooling fan 14, a bypass circuit unit 15, and an AC switch 16. With such a configuration, even if the commercial power supply 2 fails, the battery 13 connected to the DC
Instead of supplying DC power to the inverter 12,
The AC power converted by the inverter 12 continues to be supplied to the computer 9 via the AC switch 16 without interruption. At this time, the inverter 12 generally outputs AC power having a constant voltage and a constant frequency.

The contact of an AC switch 16 (shown as a contact switch in FIG. 2, but usually uses a non-contact switch such as a thyristor) is always on the A side, and the output of the inverter 12 is sent to the computer 9. Supply
When the rectifier 11 or the inverter 12 fails, the failure is detected and the AC switch 16 is immediately switched to the B side.
AC power from the commercial power supply 2 is supplied to the computer 9 via the bypass circuit 15. Therefore, the uninterruptible power supply 1
Even if 0 fails, the power supply to the computer 9 is not interrupted. However, the AC power from the commercial power supply 2 has a certain degree of voltage fluctuation and frequency fluctuation, so that the quality is unavoidably lower than the AC power output from the inverter 12.
Reference numeral 14 denotes a converter cooling fan, which is a device for cooling the uninterruptible power supply 10, particularly for cooling the rectifier 11 and the inverter 12. 2, the converter cooling fan 14 receives power from the AC side of the rectifier 11, but receives power from the DC intermediate circuit that connects the DC side of the rectifier 11 and the DC side of the inverter 12. In some cases.

When a large number of small computers are installed in a distributed manner, it is preferable to arrange the uninterruptible power supply 10 near the computer as necessary. For example AC
If standardized at 100V, there is an advantage that the delivery time can be shortened and the price can be reduced. Also, when used at a voltage other than AC 100 V, a standardized uninterruptible power supply can be used by combining with a transformer.

FIG. 3 is a main circuit connection diagram showing the configuration of the uninterruptible power supply in the case where a transformer is provided on the input side and the output side. Since the configuration is the same as that of the general example circuit described above with reference to FIG. 2, the description thereof is omitted.

In FIG. 3, an uninterruptible power supply 10
The power supply-side transformer 6 is connected to the power supply side, and the load-side transformer 7 is connected to the load side of the uninterruptible power supply 10, and these power supply-side transformer 6, load-side transformer 7, and these are cooled. And a transformer cooling fan 8 are collectively provided as a transformer device 5, and the transformer device 5 and the above-described uninterruptible power supply device 10 are often installed together.

[0008]

The uninterruptible power supply 10 is installed so that the computer 9 can be used even when the commercial power supply 2 is cut off.
For example, if the transformer cooling fan 8 stops while the uninterruptible power supply 10 supplies AC power to the computer 9, the power supply-side transformer 6 and the load-side transformer 7 cannot be operated.
Power supply to the computer 9 is interrupted. Computer 9 from commercial power supply 2 via bypass circuit 15
Even if the transformer cooling fan 8 stops during power supply to the power supply, the power supply-side transformer 6 and the load-side transformer 7 cannot be operated similarly, and the power supply to the computer 9 is interrupted. That is, the transformer cooling fan 8 requires high reliability. Therefore, differently from the illustration, the transformer device 5 is actually provided with a plurality of transformer cooling fans 8.

FIG. 4 is a layout diagram showing a case where an uninterruptible power supply box and a transformer box are installed side by side. The uninterruptible power supply box 20 accommodating the uninterruptible power supply 10 and a transformer are shown. This is an arrangement in which a transformer device box 21 housing the device 5 is arranged. However, by arranging the two, there is a disadvantage that a large installation floor area is required, and if the transformer device 5 is sized to be operated by natural cooling, the reliability is improved but the device becomes extremely large. There are drawbacks.

FIG. 5 is a layout view showing a side surface of an uninterruptible power supply box in which a space for accommodating a transformer is secured in advance. And an uninterruptible power supply 10 excluding the transformer device 5 and the battery 13 thereon.
Place. In the arrangement shown in FIG. 5, even if the transformer device 5 is unnecessary, the installation space for the transformer device 5 must be ensured, so that there is a disadvantage that the entire device becomes large.

Therefore, if the uninterruptible power supply 10 is stacked and installed on the transformer device 5, the mounting floor area can be prevented from increasing, and if the transformer device 5 is unnecessary, it can be removed. Because of this, there is an advantage that the device can be downsized. However, since the battery 13 having a large weight and low heat resistance is arranged below the uninterruptible power supply 10, the transformer cooling fan 8 is important in order to avoid the influence of the heat from the transformer device 5. It is. Further, when a plurality of transformer cooling fans 8 are installed in the transformer device 5 in order to improve reliability, the height of the transformer box accommodating the plurality of transformer cooling fans 8 increases, and the dimensions (particularly, height dimensions) of the entire device become large. There is a disadvantage that it becomes larger.

Accordingly, an object of the present invention is to prevent an increase in the size of a transformer device without lowering the reliability of the device, even when the uninterruptible power supply is stacked on the transformer device. Is to do so.

[0013]

To achieve the above object, a cooling structure for an uninterruptible power supply according to the present invention comprises an uninterruptible power supply in which a power converter is housed on a transformer box in which a transformer is housed. When the power supply boxes are stacked, the transformer housed in the transformer box can be cooled by the power converter cooling fan provided in the uninterruptible power supply box.

In the ceiling of the transformer box, an exhaust hole is provided at a position where a flow path through which air from an intake hole provided in the transformer box is exhausted through the transformer is formed. At the bottom of the uninterruptible power supply box stacked on top, an intake hole is provided at a position corresponding to the exhaust hole of the transformer box ceiling,
An airflow generated by the power converter cooling fan installed in the uninterruptible power supply box is configured to flow from the transformer box intake hole to the uninterruptible power supply box via the transformer box exhaust hole.

[0015]

FIG. 1 is a structural view showing an embodiment of the present invention. In FIG. 1, an uninterruptible power supply box 30 containing an uninterruptible power supply 10 is stacked on a transformer apparatus box 31 containing a transformer apparatus 5.
Various devices are housed in the uninterruptible power supply box 30, but only the power converter cooling fan 14 therein is illustrated, and illustration of the remaining devices is omitted. An intake hole is provided at the right end of the lower transformer device box 31 and an exhaust hole is provided at the left ceiling portion. The exhaust hole and the intake hole at the bottom of the uninterruptible power supply box 30 are opened at the same position. I have.

Normally, the operation of the transformer cooling fan 8 causes the power supply-side transformer 6 and the load-side transformer 7 to be connected during the flow of air from the intake hole at the right end of the transformer device box 31 to the transformer cooling fan 8 at the left end. Installed and cooled. Even if the transformer cooling fan 8 fails, the airflow generated by the operation of the power converter cooling fan 14 passes through the power supply-side transformer 6 and the load-side transformer 7 from the intake hole at the right end of the transformer device box 31. Then, since the heat flows into the uninterruptible power supply box 30 through the exhaust hole on the left ceiling of the transformer box 31, the heat generated by each of the transformers 6 and 7 is released to the outside by this air flow.

[0017]

According to the uninterruptible power supply provided with the transformer device, there are many configurations in which the uninterruptible power supply box is stacked on the transformer device box. A transformer cooling fan was provided to improve the reliability of the device. However, there was a problem that the device became large due to a plurality of transformer cooling fans, but according to the present invention,
Even if the transformer cooling fan stops, the power converter cooling fan attached to the uninterruptible power supply box has a structure that creates a cooling air flow in the transformer unit box. Even if the number of installed devices is reduced, an effect that the device can be downsized without lowering the reliability can be obtained.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing an embodiment of the present invention.

FIG. 2 is a main circuit connection diagram showing a general configuration of an uninterruptible power supply.

FIG. 3 is a main circuit connection diagram showing a configuration of an uninterruptible power supply in a case where a transformer is provided on an input side and an output side.

FIG. 4 is a layout diagram showing a case where an uninterruptible power supply unit box and a transformer box are installed side by side;

FIG. 5 is a layout view showing a side surface of an uninterruptible power supply box in which a space for accommodating a transformer is secured in advance.

[Explanation of symbols]

 2 Commercial power supply 5 Transformer device 6 Power supply side transformer 7 Load side transformer 8 Transformer cooling fan 9 Computer 10 Uninterruptible power supply 11 Rectifier as power side converter 12 Inverter as load side converter 13 Battery 14 Power conversion Unit cooling fan 15 Bypass circuit 16 AC switch 20, 22, 30 Uninterruptible power supply box 21, 31 Transformer box

Claims (2)

[Claims] An uninterruptible power supply having a structure in which an uninterruptible power supply box containing a power converter is stacked on a transformer box containing a transformer, wherein the transformer contained in the transformer box is provided. And cooling the power converter provided in the uninterruptible power supply box with a power converter cooling fan for cooling the power converter. 2. An uninterruptible power supply having a structure in which an uninterruptible power supply box containing a power conversion device is stacked on a transformer box containing a transformer, wherein the transformer box is provided with an intake hole, An exhaust hole is provided in the transformer box ceiling at a position forming a flow path through which the air from the intake hole is exhausted through the transformer, and the transformer box exhaust hole at the bottom of the uninterruptible power supply box. An intake hole is provided at a matching position, and an air flow generated by the power converter cooling fan installed in the uninterruptible power supply box is connected to the uninterruptible power supply box through the transformer box intake port through the transformer box exhaust hole. A cooling structure for an uninterruptible power supply, wherein the cooling structure has a structure that flows into the power supply.