JPS5818277Y2 - Evaporative cooling device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an evaporative cooling device that cools insulating oil of a transformer using the latent heat of vaporization of water, for example.

A conventional evaporative cooling device was constructed as shown in FIG.

In FIG. 1, 1 is a plurality of vertically arranged hollow cooling pipes, 2 is a closed container that covers the upper and lower tube plates 3 and 4, which support and fix the upper and lower parts of the group of cooling pipes;
This is an oil passage that passes insulating oil to the outer surface of the cooling pipe, and together with the cooling pipe 1, constitutes a cooler main body 5.

Reference numeral 6 indicates a water spray nozzle arranged at the upper part of the cooling pipe group.

In such a configuration, by spraying water from the water spray nozzle 6, the inner surface of the cooling pipe 1 is wetted and the water is evaporated, thereby removing heat from the high-temperature insulating oil.

In the conventional system, as mentioned above, the water spray nozzle 6 was installed on the top of the cooler to spray water, so the water spray nozzle 6 became clogged with foreign matter in the water, sludge, etc., resulting in a decrease in cooling capacity.
There were problems such as accelerated scale adhesion due to partial drying.

Furthermore, in order to spray water uniformly, it was necessary to spray it from a nozzle, which required a water pump with a large output.

This idea eliminates the drawbacks of the conventional products as described above, and consists of arranging the cooling tubes vertically and providing cutouts or holes in the protruding parts of the cooling tubes that protrude a certain length from the upper tube plate. Water is continuously stored at a constant depth on the upper tube plate, and this water is introduced into the cooling pipe through the notch or hole to uniformly wet the inner wall of the cooling pipe and evaporate on the inner wall of the cooling pipe. This provides an evaporative cooling device that is an improved water spray nozzle system that has no possibility of clogging, is highly reliable in terms of operation and maintenance, and saves water pump power.

An embodiment of this invention will be described below with reference to FIGS. 2 to 4.

In FIG. 2, reference numeral 5 denotes the main body of the evaporative cooler, and the cooling pipe 1 protrudes from the upper tube plate 3 by a certain length.

7 is the above-mentioned saucer, 8 is an eliminator that prevents water from scattering,
9 is a blower that pushes air saturated with water vapor to the outside; 1
0 is a lower water tank, 11 is a water pump that pumps water from the lower water tank 10 to the upper saucer 7, 12 is a circulation water pipe, and 13 is the saucer 7 and the lower water tank 10 for adjusting the water depth of the upper saucer 7.
The connecting pipe is shown.

Fig. 3 shows the details of the main body of the evaporative cooling device according to this invention, in which 1 is the cooling pipe, 3°4 is the upper and lower tube plates, 2 is the closed container constituting the oil passage, and 14 is the cooling pipe. The oil side header 15 is water collected in the upper tray 7.

FIG. 4 is an enlarged view of part A in FIG. 3, where 16 is a protrusion projecting from the upper tube plate 2 of the cooling pipe 1, and 17 is a cross-shaped notch provided in the protrusion.

Note that the arrow indicates the state of water flowing in.

Figure 5 shows a cooler of the same type with a notch in place of the above.
A hole 18 for guiding water is shown around the protrusion 16 of the cooling pipe.

In addition, in FIG. 4, the shape of the notch 17 may be a radial shape in addition to a cross shape, and various shapes can be applied.

In the evaporative cooling system shown in FIG.
The excess water is sent from 0 to the upper tray 7 by the water pump 11, is transmitted to the inner wall of the cooling pipe, and evaporates while falling, absorbing heat from the high-temperature insulating oil, and the excess water falls into the lower water tank 10.

Further, when the water in the upper tray 7 reaches a certain depth or more, it bypasses the connecting pipe 13 and falls into the lower water tank 10.

In this way, water is continuously circulated.

In the evaporative cooler shown in FIG. 3, water stored at a constant depth in the upper tray 7 flows into the tube through the notch 11 or hole 18 provided in the protrusion 16 of the cooling tube 1, and evenly coats the inner wall of the cooling tube. It falls while getting wet and evaporates during that time, absorbing heat from the high-temperature insulating oil.

Notch 17 of the cooling pipe according to this invention compared to the water spray nozzle
Alternatively, the hole 18 has a structure that prevents it from becoming clogged with foreign matter or sludge, but even if it does become clogged, the connecting pipe with the lower water tank 10 should be set so that the upper water depth limit of the upper saucer 1 is slightly larger than the protruding height of the cooling pipe 1. 13 By determining the mounting position, it is possible to send an appropriate amount of water into the cooling pipe, so even if it is operated in that state until the next inspection opportunity, there will be no operational problems such as a decline in cooling performance.

This has the same effect even when a large amount of foreign matter or sludge accumulates in the upper tray γ to a level higher than the notch 1T or hole 18 of the cooling pipe.

As described above, according to this invention, there is no need for a water spray nozzle, and therefore there is no problem such as a lack of cooling water due to clogging of the water spray nozzle, so a constant cooling capacity is always maintained and there is no problem such as scale adhesion due to partial drying. No problems occur.

Furthermore, when circulating water, it is only necessary to pump it from the lower water tank to the upper water tank, and there is no need to spray it from a nozzle, so a water pump with a small output can be used.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a conventional evaporative cooling device, Fig. 2 is a block diagram showing an embodiment of this invention, Fig. 3 is a detailed view showing the main parts of this invention, and Fig. 4 is a block diagram showing an embodiment of this invention. FIG. 5 is an enlarged perspective view of part A in the figure, and FIG. 5 is an enlarged perspective view of another example corresponding to FIG. 4. Note that the same reference numerals in the figures indicate the same or corresponding parts. In the figure, 1 is a cooling pipe, 2 is a sealed container for an oil passage, 3 is an upper tube plate, 4 is a lower tube plate, 5 is a cooler body, 7 is an upper saucer, 16 is a protrusion of the cooling tube, and 17 is a notch. Part 18 is a hole.

Claims (1)

[Scope of utility model registration request] In a cooling device in which a hollow cooling pipe is arranged vertically, insulating oil is poured on the outer surface of the cooling pipe, water is dripped inside the cooling pipe, and water is evaporated to remove heat from the high-temperature insulating oil. Water is stored on an upper tube plate that supports the upper end, and the upper end of the cooling pipe is made to protrude from the upper tube plate so as to protrude above the water surface, and a notch or hole is provided in this protruding portion. An evaporative cooling device characterized in that water is introduced through holes or holes.