JP2009303354A - Air cooling apparatus of transformer board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved air cooling apparatus which ventilates a transformer stored in a board from both front and rear sides with outside cooling air and efficiently cools it with a front maintenance-type transformer board as an object. <P>SOLUTION: Exhaust fans 4 are arranged on a ceiling of the board 1 storing the transformer 3 and inlets 2 on a front lower part. The transformer is ventilated with outside cooling air taken into the board through the inlets so as to cool it in the air cooling apparatus of the transformer board. An air guide duct 5 combined with a ventilation fan 6 is arranged on a back side of a bottom in the board. Ventilation ports 5a are opened toward a back of the transformer 3 in the air guide duct. Part of outside air taken into the board through the inlets is branched and sent toward the back of the transformer from the ventilation ports of the air guide duct. Specifically, the air guide duct 5 is made in an almost L shape, the inlet of it is made to face the front in the board and it is installed along a route to the back side in the board by making it bypass the side of the transformer. The ventilation fan 6 is formed in the inlet, and the ventilation ports 5a are dispersively opened in a plurality of parts by adjusting positions to respective phase windings 3a of the transformer 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an air cooling device for a transformer panel applied to a power conversion device (inverter device) or the like.

As is well known, a power converter having a large capacity is composed of a row of input transformers, an inverter unit, and a control unit that are separately stored, and a dry self-cooling transformer is generally used as the transformer. After being stored in a panel, outside air is blown into the panel to cool the transformer by air cooling (for example, see Patent Document 1 and Patent Document 2).
Next, a conventional structure of the air cooling device is shown in FIGS. 3 and 4, taking as an example a transformer board of a power conversion device constituted by a front / back maintenance type row board. First, in FIG. 3, 1 is a transformer board, 2 is a door arranged on the front (and rear) of the board 1, and 2 is a ventilation inlet provided in the lower door of the board 1, FIG. , (B), a transformer (dry self-cooling transformer) 3 is stored and installed in an upright position inside the transformer panel 1. The illustrated transformer 3 is a three-phase transformer, and 3a is a winding of each phase wound around an iron core (three-legged iron core).
The transformer panel 1 is provided with an exhaust fan 4 on the ceiling, and the outside air cooling air taken into the panel through the intake port 2 opened in the lower doors arranged on both front and rear sides of the panel 1 from the front and rear as shown by the arrows in the figure. The transformer 3 is ventilated for cooling.
JP-A-7-87629 JP 2006166664 A

The transformer panel 1 shown in FIG. 4 is a front / rear maintenance type panel that has a maintenance space on the front and rear sides of the panel and is arranged in the electrical room of the building. The air intake 2 is taken into the panel. On the other hand, recently, due to the demand for space and space saving in the electrical room, front maintenance type panels that press the power converter row board against the wall surface of the electrical room and omit the maintenance space on the back side are often used. ing.
By the way, the front maintenance type panel cannot secure the intake port for taking in the outside air to the back side of the panel, and takes in the outside air only from the intake port opened in the front of the board. There is a problem that the rear side of the vessel becomes a blind spot of the ventilation path, and the outside air cooling air with a sufficient amount of air cannot be passed through this portion, and the transformer cannot be cooled efficiently.
In this respect, as in the above-mentioned Patent Document 2, the outside air taken into the panel is guided to the air duct formed under the floor surface in the panel through the air inlet opening in the lower front portion of the panel. By blowing the cooling air toward the front and back of the transformer, the entire transformer can be cooled with air without blind spots in the ventilation path even with the front maintenance type panel.
However, in order to implement this air cooling structure, the space in the panel is restricted in the height direction in order to secure an air guide duct under the floor board in the panel, and the front air intake of the panel is placed on the front side of the transformer. A communication duct for guiding the outside air taken in from the mouth to the air duct under the floor and a guide for guiding the cooling air blown from the duct under the floor to the front side of the transformer are required. In addition, these ducts and guide structures become obstacles when the transformer is carried in and out of the board, and there is a problem that it is necessary to remove and reassemble each time.

  The present invention has been made in view of the above points. For the above-described front maintenance type panel, the above-described problems are solved and the outside air cooling air is passed from both the front and rear sides to the transformer housed in the panel. It is an object of the present invention to provide an improved air cooling device for a transformer panel so that it can be efficiently cooled.

In order to achieve the above object, according to the present invention, an exhaust fan is provided in the ceiling of a panel containing a transformer, an intake port is provided in the lower front portion, and outside air cooling air taken into the panel through the intake port is supplied to the transformer. In the air cooling device of the transformer panel that cools by ventilation,
An air duct combined with a blower fan is provided on the back side of the bottom of the panel, and an air blower opening is opened in the wind duct toward the back of the transformer, and the outside air taken into the panel through the intake port. A part of the airflow is diverted from the air outlet of the air duct toward the rear surface of the transformer (claim 1), and specifically configured in the following manner.
(1) The air duct is laid along a substantially L-shaped path with the air inlet directed toward the front of the panel, bypassing the side of the transformer and reaching the back of the panel. After the blower fan is attached to the opening, the blower opening is dispersedly opened at a plurality of locations toward the back of the transformer (claim 2).
(2) In the configuration of the preceding item (1), the air duct duct opening is opened obliquely upward toward the transformer (claim 3).
(3) Moreover, the ventilation opening which carried out dispersion | distribution opening to the said air guide duct opens to the position facing each phase winding of a transformer (Claim 4).
(4) Furthermore, an air volume adjusting plate for optimizing the air volume blown from each air outlet toward the transformer is provided at the air outlet of the air guide duct.

According to the above configuration, the outside air cooling air taken into the panel through the air inlet opening at the lower front of the transformer panel is blown from both the front and rear surfaces toward the transformer to effectively cool the entire transformer. can do.
Here, the wind guide duct laid on the bottom (on the floorboard) in the panel is arranged along an L-shaped path that bypasses the side of the transformer and reaches the back side, so that the wind guide duct is It does not become an obstacle when the transformer is carried in and out of the panel from the front side. Moreover, by attaching a blower fan to the air inlet of the air guide duct facing the front of the panel, the outside air taken into the cabinet can be pushed into the duct and blown.
In addition, by opening the air outlets that are dispersedly opened in the air guide duct obliquely upward in accordance with the arrangement of each phase winding of the transformer, the outside air cooling air is blown out toward each phase winding of the transformer through the air outlet. be able to. Furthermore, an air volume adjusting plate (damper) is provided at the air outlet, and by appropriately initializing the opening area of the air outlet with this air volume adjusting plate, the amount of air blown out from each air outlet is averaged and each transformer Can blow to phase winding. In addition, it is also possible to increase the air volume to the winding wound around the center leg of the iron core as necessary (the heat radiation area is smaller than that of the winding wound around the left and right legs).

Embodiments of the present invention will be described below based on the examples shown in FIGS. 1 (a) and 1 (b) are structural layout diagrams in the panel, and FIG. 2 is a front view showing the layout of the air duct in a state where the transformer is taken out from the panel, and the members corresponding to FIG. Are denoted by the same reference numerals, and description thereof is omitted.
The transformer panel 1 of this embodiment is a front maintenance type panel having a panel door and an intake port 2 only on the front surface of the panel, and a wind guide duct 5 is newly provided on the floor plate at the bottom of the panel. Yes. The air guide duct 5 has an L-shaped duct as viewed from above, and its air inlet is directed forward in the panel, bypassing the side of the transformer 3 and reaching the rear side in the panel. A blower fan 6 (two in the illustrated example) is attached to the air inlet at the front end of the duct. Note that the end of the duct is closed.
Further, the duct laid on the back side of the transformer 3 has a trapezoidal cross-sectional shape in which the surface facing the transformer 3 is obliquely cut, and each phase winding of the three-phase transformer 3 is placed in this duct portion. The opening positions are aligned with 3a, and the air blowing ports 5a are distributed and opened in three oblique directions in an obliquely upward direction.
In the above configuration, when the blower fan 6 attached to the air guide duct 5 is operated together with the exhaust fan 4 disposed on the ceiling of the panel 1 during operation of the power converter, the inside of the panel is introduced from the intake port 2 opened at the lower front of the panel 1. The outside air taken in is divided into two ventilation paths as described below, and one of them is ventilated along the winding 3a from the front of the transformer 3 as indicated by an arrow A, and then the exhaust fan 4 on the ceiling is After that, it is exhausted outside the board. The other is blown into the air guide duct 5 through the blower fan 6 as indicated by an arrow B, and blown obliquely upward from the back side toward the transformer 3 through the air blowing port 5a that is dispersedly opened in the air guide guide 5. And after ventilating along each phase coil | winding 3a, it merges with the said branch flow A, and is exhausted out of the board. As a result, the outside air cooling air can be efficiently cooled by passing it through the transformer 3 from the front and rear surfaces.

  In addition, as shown in FIG. 2, an air volume adjusting plate (damper) 5b is attached to the air blowing port 5a that is dispersedly opened along the longitudinal direction of the air guide duct 5, and the opening area of each air blowing port 5a is attached by the air volume adjusting plate 5b. By properly setting the initial setting (setting to reduce the effective opening area of the air outlet opening downstream (the duct end is closed) compared to the air outlet opening upstream of the duct), The air volume blown out from the air blowing port 5a is averaged, and the respective phase windings 3a of the transformer 3 can be uniformly cooled with air. Of the phase windings 3a, the windings sandwiched between the left and right windings and wound around the central leg of the iron core (the heat radiation area is smaller than the left and right windings) are opposed to this. It is also possible to correct the adjustment plate 5b so as to increase the amount of air blown from the blower opening 5a.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a layout view of a transformer panel according to an embodiment of the present invention, wherein (a) and (b) are a front view and a side view, respectively. Front view showing structure and arrangement of air duct with transformer removed from Fig. 1 External front view of transformer panel It is the block diagram which shows the conventional air-cooling cooling device of a transformer panel, (a), (b) is a front view and a side view, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transformer board 2 Air inlet of transformer board 3 Transformer 3a Winding 4 Exhaust fan 5 Air guide duct 5a Blower 5b Air volume adjustment board 6 Blower

Claims (5)

In an air cooling device for a transformer panel, an exhaust fan is provided on the ceiling of the panel containing the transformer, an air inlet is provided in the lower front part, and the outside air cooling air taken into the panel through the air inlet is passed through the transformer for cooling.
An air duct combined with a blower fan is provided on the back side of the bottom of the panel, and an air blower opening is opened in the wind duct toward the back of the transformer, and the outside air taken into the panel through the intake port. An air cooling device for a transformer panel, wherein a part of the air is shunted from the air duct duct to the back of the transformer. 2. The air cooling apparatus according to claim 1, wherein the air guide duct has a suction path directed toward the front of the panel, bypasses a side of the transformer, and extends along a substantially L-shaped path to the rear side of the panel. An air cooling device for a transformer panel, which is laid and installed with a blower fan at the air inlet, and the air outlets are distributed and opened at a plurality of locations toward the back of the transformer. 3. The air cooling apparatus for a transformer panel according to claim 2, wherein the air outlets of the air duct are dispersed and opened at positions facing each phase winding of the transformer. 3. The air cooling apparatus for a transformer panel according to claim 2, wherein the air blowing duct has an air outlet opening in an obliquely upward direction toward the transformer. The air cooling device according to any one of claims 2 to 4, wherein an air volume adjusting plate for adjusting the blown air volume is provided at an air blowing port of the air guide duct.

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