JPH0346557Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is applicable to closed-cooled electric devices that are cooled by air circulating inside the housing, such as single-cooled rectifiers, and in particular to improvements in the drain discharge structure. It is related to.

[Conventional technology]

FIG. 5 is a cross-sectional view of a conventional closed cooling electrical device. In the figure, 1 is a housing composed of a housing frame 2 and a side plate 3, 4 is a partition plate for forming an air circulation path within the housing 1, 5 is a heat exchanger for cooling, and 6 is a housing. 7 is an electrical device such as a power transformer, 8 is an electrical device such as a thyristor, 9 is a drain tray disposed at the bottom of the housing 1, and 10 is a waste water collected on the drain tray 9. This is a drain hole for discharging water. Note that 11 to 16 are extremely small spaces remaining between the casing skeleton 2 and the side plate 3.

Next, the operation will be explained. In order to cool the inside of the casing by forced air cooling, the pressurized fan 6 is driven while keeping the heat exchanger 5 at a low temperature to form a downward air flow. The air passes through the lower part of the partition plate 4 and rises while absorbing the heat around the electrical equipment 7. After passing through the upper part of the partition plate 4, the air absorbs the heat around the electrical equipment 8 and returns to the heat exchanger 5. A cycle of returning to the surrounding area takes place. Now, assuming that the air pressure inside the casing before the pressurized fan 6 is operated is equal to the air pressure outside the casing, there will be a pressure loss in the air circulation path inside the casing due to air resistance while the pressurized fan 6 is operating. occurs, so the pressure is highest near the bottom of the pressurized fan 6, and the pressure around the heat exchanger 5 is lowest. Since the average pressure inside the casing is originally the same as that outside, air is released between 11 and 12 where the pressure is high, and air is taken in between 15 and 16 where the pressure is low. will be held. Here, if the pressure loss due to discharge through the drain discharge hole 10 is made sufficiently smaller than the pressure loss between the drain holes 11 and 12, the air inside the housing will be discharged mainly from the drain discharge hole 10. The consumption of air inside the housing due to this release is
Supplemented by suction at 5, 16, the outward flow at drain outlet 10 is maintained continuously. During operation, water droplets grow due to condensation of water vapor on the surface of the heat exchanger 5 and fall one by one, and the water droplets are struck by the pressure fan 6 onto the drain tray 9 as shown in FIG. The drain outlet hole 1 is installed along the slope of the drain tray 9.
It is flushed out to 0. Since the air pressure near the drain tray 9 is maintained at the highest pressure inside the casing as described above, there is an extremely low possibility that the moisture condensed near the heat exchanger 5, which is at a low pressure, will re-evaporate.

[Problem that the invention attempts to solve]

Since the conventional closed cooling type electric device is configured as described above, the air flows in a turbulent flow immediately below the pressure fan 6. Therefore, there is a problem in that the water droplets hitting the drain pan 9 are picked up by the irregular air flow and recirculated, dampening the electrical equipment 7 and 8 and degrading their insulation performance. Ta.

This invention was made in order to solve the above-mentioned problems, and the purpose is to obtain a structure in which it is difficult for the spray near the surface of the drain tray to be recirculated.

[Means for solving problems]

The closed cooling electric device according to this invention consists of a housing that is not a completely sealed structure, electrical equipment built into the housing, a pressure fan and a heat exchanger that cool the electrical equipment through forced ventilation. , on the surface of the drain tray near the bottom of the housing.
It is equipped with a net-like wind control plate to suppress wind speed.

[Effect]

The closed cooling type electric device based on this invention uses a mesh-like air baffle plate placed on the surface of the drain tray.
By slowing down the air flow in this area,
Splash caused by splashing water droplets can be collected by their natural fall due to gravity.

[Example] Hereinafter, an example of this invention will be described with reference to the drawings. In FIGS. 1 and 2, numerals 1 to 16 are similar to those of the conventional device described above. Reference numeral 17 denotes a wind control plate made of a wire mesh or the like which is arranged horizontally so as to cover the entire surface of the drain tray 9, and is supported at a constant distance from the drain tray 9.

In the closed cooling electric device configured as described above, among the air flows formed by the pressure fan 6, the flow near the surface of the drain tray 9 is decelerated by the baffle plate 17 made of wire mesh or the like. Therefore, water droplets tend to naturally fall under the wind control plate 17 made of wire mesh or the like. Furthermore, if the grid of the wind control plate 17 is made of a finely woven wire mesh made of sufficiently thin wire, even if water droplets are struck from above against the wind control plate 17, the rebound can be almost ignored.

Next, FIGS. 3 and 4 show another embodiment of this invention, in which a honeycomb-shaped lattice 18 is used as the wind control plate 17, and in this case, the contact area of the upper end surface can be reduced to zero. In addition, since the thickness of the grid can be increased, it is more effective in eliminating splashing of droplets and reducing wind speed. Also, the wind control plate 17
A similar effect can be expected even if it is made of a material that is permeable to water droplets, such as a woven plastic net or artificial turf.

[Effect of idea]

As described above, according to this invention, the condensed water generated on the surface of the heat exchanger can be efficiently collected without damaging the pressurized state near the bottom of the casing, so the effect is that the electrical equipment is hardly dampened. There is.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electrical device according to an embodiment of this invention, Fig. 2 is a perspective view showing the drain tray portion thereof, Fig. 3 is a sectional view showing another embodiment of this invention, and Fig. 4 is its sectional view. A perspective view showing a drain tray part,
FIG. 5 is a sectional view of a conventional electrical device, and FIG. 6 is a perspective view of its drain tray. In the figure, 1 is a housing, 4 is a partition plate, 5 is a heat exchanger, 6
1 is a pressure fan, 7 and 8 are electric devices, 9 is a drain tray, 10 is a drain discharge hole, and 17 and 18 are air control plates. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of claim for utility model registration] (1) Consisting of a housing that is not completely sealed, electrical equipment built into the housing, a pressurized fan that cools the electrical equipment through forced ventilation, and a heat exchanger. A closed cooling type electrical device, characterized in that a net-like wind control plate is provided on the surface of a drain tray provided near the bottom of the casing for suppressing wind speed near the surface of the tray. . (2) The closed cooling electric device according to claim 1, wherein the wind control plate is a wire mesh or a plastic mesh. (3) The closed cooling electric device according to claim 1, wherein the wind control plate is a grid such as a honeycomb. (4) The closed cooling electric device according to claim 1 of the utility model registration claim, wherein the wind control board is an artificial grass.