JP2010025487A - Sealed cooling tower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed cooling tower for efficiently heat-exchanging by dropped spray water flowing down over the whole side surface of a heat exchanger. <P>SOLUTION: The heat exchanger 2 is arranged inside a tower body 8, and the spray water is dropped on the heat exchanger 2 for cooling refrigerant circulating in the heat exchanger 2 by latent heat of the vaporization. In the sealed cooling tower 1, an upper end part 2a of the heat exchanger 2 is directed upward to form a convex inclining surface 21a or a curved surface 21a'. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hermetic cooling tower, and more particularly to an improvement of a heat exchanger disposed in the tower body.

For example, as shown in FIG. 5, the closed cooling tower 30 circulates the refrigerant between the heat exchanger 31 and the load 3 by the refrigerant circulation pump 4, and spray water sprayed from above by the spray water pump 5. Thus, the refrigerant circulating in the heat exchanger 31 is cooled.
The spray water is sprinkled from the water tank 6 disposed in the upper part of the tower body 8 with respect to the heat exchanger 31 disposed in the tower body 8 of the sealed cooling tower 30.
The spray water is dropped on the heat exchanger 31 in which the refrigerant that has become high temperature by cooling the load 3 flows, cools the refrigerant circulating in the heat exchanger 31 by latent heat of vaporization, and is placed below the tower body 8. It collects in the arranged water tank 7 and is sent again to the watering tank 6 by the spray water pump 5.
In addition, a fan 9 is disposed at the upper part of the tower body 8, and outside air is sucked from the side surface of the tower body 8 by the fan 9, and the inside of the heat exchanger 31 is circulated by promoting vaporization of the sprayed water. The cooling of the refrigerant is promoted.

Incidentally, a pipe-shaped metal tube is normally used for the heat exchanger 31 used in the hermetic cooling tower 30.
However, when tap water or the like is used as spray water, since the tap water contains hardness components, these hardness components are deposited as scales on the surface of the pipe-shaped metal tube.
Since the deposited scale significantly reduces the efficiency of heat exchange, periodic cleaning is necessary. However, it is not easy to clean a bent metal tube, which requires a lot of work. It was.

In order to cope with such a problem, as shown in FIG. 6, a hermetic cooling tower using a heat exchanger 32 in which plates 33 are arranged to face each other and joined by welding or the like so that a refrigerant flows therethrough is proposed. (For example, refer to Patent Document 1).
JP 2002-310585 A

By the way, in the sealed cooling tower using the heat exchanger, even when the spray water dropped toward the heat exchanger 32 falls on the upper surface of the heat exchanger 32 as shown in FIG. It will bounce off the upper surface of the vessel 32 and scatter.
In this way, the sprayed water that rebounds from the upper surface of the heat exchanger 32 and scatters between the heat exchangers 32 is partly side surfaces of the heat exchanger 32 due to the action of outside air that passes between the heat exchangers 32. The heat exchanger 32 is cooled and the upper portion X of the side surface of the heat exchanger 32 is less wet, so that heat cannot be efficiently exchanged over the entire side surface of the heat exchanger 32. There was a problem.

  Moreover, the spray water dripped between the heat exchangers 32 falls to the water tank 7 disposed in the lower part of the tower body 8 without cooling the heat exchanger 32, and the spray water pump 5 There was a problem of increasing the load.

  In the present invention, in view of the problems of the above-described conventional closed cooling tower, the spray water to be dropped flows down over the entire surface including the upper part of the side surface of the heat exchanger, and heat can be exchanged efficiently. A first object is to provide a hermetic cooling tower.

  In addition, the present invention reduces the amount of spray water that falls without cooling the heat exchanger, reduces the load on the spray water pump, and can thereby save energy and reduce the size of the spray water pump. A second object is to provide a cooling tower.

  It is a third object of the present invention to provide a hermetic cooling tower that can reduce the air resistance of the outside air sucked by the fan, thereby reducing the size of the fan and saving power.

  In order to achieve the first object, the hermetic cooling tower of the present invention has a heat exchanger disposed in the tower body, and spray water is dropped into the heat exchanger to circulate in the heat exchanger by latent heat of vaporization. The hermetic cooling tower for cooling the refrigerant is characterized in that the heat exchanger is formed in a convex inclined surface or curved surface with the upper end portion facing upward.

  In this case, in order to achieve the second object, the sprayed water is dripped on the ridge line of the upper end portion of the heat exchanger formed on the convex inclined surface or the curved surface upward and / or in the vicinity thereof. Can be.

  Similarly, in order to achieve the second object, a sprayed water regulating member that regulates the dripping range of the sprayed water is arranged above a plurality of heat exchangers arranged in parallel at predetermined intervals. Can be set.

  Moreover, in order to achieve the said 3rd objective, the side edge part of the air inflow side of a heat exchanger can be formed in a convex inclined surface or a curved surface toward the air inflow side.

  The hermetic cooling tower of the present invention is a hermetic cooling tower in which a heat exchanger is disposed in a tower body, sprayed water is dropped on the heat exchanger, and the refrigerant flowing in the heat exchanger is cooled by latent heat of evaporation. By forming a convex inclined surface or curved surface with the top end of the exchanger facing upward, the sprayed water that is dripped has little rebound when it hits the top end of the heat exchanger, and is sprayed Water flows down over the entire surface including the upper part of the side surface of the heat exchanger, and heat can be exchanged efficiently.

  Also, spray water can be dripped onto the ridgeline of the upper end of the heat exchanger formed on the convex inclined surface or curved surface upward and / or the vicinity thereof, or a plurality of the sprayed water can be arranged in parallel at predetermined intervals. By disposing a sprayed water regulating member that regulates the dripping range of sprayed water above the heat exchanger that is disposed in such a way, the heat exchanger can be cooled without going through the heat exchanger. The falling spray water can be reduced, the load of the spray water pump can be reduced, and thereby energy saving and downsizing of the spray water pump can be achieved.

  Moreover, by forming the side end of the heat exchanger on the air inflow side as a convex inclined surface or curved surface facing the air inflow side, the air resistance of the outside air sucked by the fan can be reduced, It is possible to reduce the size and power consumption of the fan.

  Hereinafter, embodiments of a hermetic cooling tower of the present invention will be described with reference to the drawings.

1 to 3 show a first embodiment of a hermetic cooling tower according to the present invention.
The hermetic cooling tower 1 includes a heat exchanger 2, a water spray tank 6 for spraying spray water for cooling the heat exchanger 2, and a water tank for storing spray water for cooling the heat exchanger 2. 7 and a fan 9 that sucks outside air and cools the heat exchanger 2.
The refrigerant that has become high temperature by cooling the load 3 is introduced into the heat exchanger 2 from the refrigerant inlet 2c by the refrigerant circulation pump 4, and circulates to the load 3 by being led out from the refrigerant outlet 2d. .
The spray water for cooling the heat exchanger 2 is circulated from the water tank 7 to the water spray tank 6 by the spray water pump 5.

  The heat exchanger 2 is formed by arranging the plates 21 so as to face each other, and a plurality of the heat exchangers 2 are arranged in the tower body 8 at a predetermined interval. Sprinkling water is dripped from the sprinkling tank 6 disposed above the refrigerant, and the refrigerant circulating in the heat exchanger 2 is cooled by latent heat of evaporation.

  The heat exchanger 2 is formed in a convex inclined surface or curved surface with the upper end portion 2a facing upward, so that the dripping sprayed water hits the upper end portion 2a of the heat exchanger 2. Thus, the splashed water is made to flow down over the entire surface including the upper part of the side surface of the heat exchanger 2 so that heat can be exchanged efficiently.

  The shape of the upper end portion 2a of the heat exchanger 2 is not particularly limited as long as it is formed as a convex inclined surface or curved surface upward, but as shown in FIG. The upper end portion of the plate 21 to be arranged is formed on a symmetrical inclined surface 21a bent inward, and the upper end is joined by resistance welding, brazing, or the like, as shown in FIG. One upper end of the plate 21 is formed on a one-sided inclined surface 21a bent inward, or as shown in FIG. 2 (d), the upper end of the opposed plate 21 is directed inward. It can also be formed on a curved curved surface 21a 'that is curved.

  In addition, although the shape of the lower end part 2e of the heat exchanger 2 is not specifically limited, By making it into the shape of the convex inclined surface or the curved surface toward the bottom according to the shape of the upper end part 2a, Thus, it is possible to efficiently perform the operation of joining the plates 21 arranged to face each other.

  Further, the heat exchanger 2 can be made of a metal such as stainless steel, a resin such as polyvinyl chloride, or a composite resin such as FRP, or an integrally molded product.

  In addition to increasing the surface area, the plate 21 constituting the heat exchanger 2 can increase the efficiency of heat exchange by allowing the refrigerant to flow through the heat exchanger 2 as a turbulent flow. In order to increase the strength of the heat exchanger 2, it is desirable to use a material whose surface is formed in an uneven shape by press molding or the like.

In this case, the sprayed water dropped from the water spray tank 6 may be uniformly dropped into the tower body 8, but as shown in FIGS. 2 (a) and 3 (a), heat exchange is performed. The upper end portion of the heat exchanger 2 is formed with a sprinkling hole 6a on the bottom surface of the sprinkling tank 6 so as to be substantially parallel to the ridge line of the upper end portion 2a of the vessel 2, and formed on a convex inclined surface or curved surface upward. It is preferable that the spray water is dropped on the ridge line 2a and / or the vicinity thereof.
As a result, the total amount of sprayed water dripped from the water spray tank 6 flows down along the inclined surface 21a and the curved surface 21a ′ forming the upper end portion 2a of the heat exchanger 2, and thus does not pass through the heat exchanger 2. In addition, the spray water falling without cooling the heat exchanger 2 can be substantially eliminated, and the load on the spray water pump 5 can be reduced.

In addition, as shown in FIG. 3 (b), in the case of using a watering tank 6 in which watering holes 6a are uniformly formed on the bottom surface, a plurality of heat exchangers 2 arranged in parallel at predetermined intervals are used. A spray water regulating member G that regulates the dripping range of the spray water is disposed above the spray water, and the spray water dripped between the heat exchangers 2 through the water spray holes 6 a of the water spray tank 6 is disposed at the upper end of the heat exchanger 2. It can also be made to guide to the inclined surface 21a and the curved surface 21a ′ forming the portion 2a.
The spray water regulating member G is disposed for the purpose of reducing the spray water falling without passing through the heat exchanger 2 and without cooling the heat exchanger 2. The shape is not particularly limited as long as it functions so as not to be dropped on the upper end 2a and to pass between the heat exchangers 2, and is formed in a convex shape upward as shown in FIG. In addition to the mountain shape, a member having an arc shape or a semi-cylindrical shape can be used.
As a result, the total amount of sprayed water dripped from the water spray tank 6 flows down along the inclined surface 21a and the curved surface 21a ′ forming the upper end portion 2a of the heat exchanger 2, and thus does not pass through the heat exchanger 2. In addition, the spray water falling without cooling the heat exchanger 2 can be substantially eliminated, and the load on the spray water pump 5 can be reduced.

  The hermetic cooling tower 1 is formed in a shape formed on a convex inclined surface or curved surface with the upper end 2a of the heat exchanger 2 facing upward, so that the sprayed water to be dropped is directed upward. There is little rebound when it hits the upper end 2a of the heat exchanger 2 formed on the convex inclined surface or curved surface, and the dripping water flows down over the entire surface including the upper part of the side surface of the heat exchanger 2. In addition, heat exchange can be performed efficiently.

FIG. 4 shows a second embodiment of the hermetic cooling tower of the present invention.
The hermetic cooling tower 1 is formed such that the shape of the side end portion 2b on the air inflow side of the heat exchanger 2 is a convex inclined surface or curved surface facing the air inflow side (in the above embodiment) The shape of the side end portion 2b on the air inflow side of the heat exchanger 2 of FIG.

  The shape of the side end portion 2b on the air inflow side of the heat exchanger 2 is not particularly limited as long as it is formed into a convex inclined surface or curved surface toward the air inflow side, but is shown in FIG. As described above, the side end of the plate 21 that is disposed oppositely is formed on a symmetrical inclined surface 21b bent inward, and the side end is joined by resistance welding, brazing, or the like, and the upper end of the heat exchanger 2 Similarly to 2a, one side end of the opposed plate 21 is formed into a one-sided inclined surface bent inward, or the side end of the opposed plate 21 is curved inward. It can also be formed on a symmetrical curved surface.

  The shape of the side end 2f on the opposite side of the air inflow side of the heat exchanger 2 is not particularly limited. However, the shape of the side end 2b on the air inflow side is opposite to that of the air inflow side. By forming a convex inclined surface or curved surface toward the side, it is possible to efficiently perform the joining operation of the opposed plates 21.

In this way, by forming the side end 2b on the air inflow side of the heat exchanger 2 in a convex inclined surface or curved surface facing the air inflow side, the air resistance of the outside air sucked by the fan 9 is reduced. Thus, the fan 9 can be reduced in size and power can be saved.
The other configuration and operation of the present embodiment are the same as those of the first embodiment.

  As described above, the sealed cooling tower of the present invention has been described based on a plurality of examples. However, the present invention is not limited to the structure described in the above examples, and the structure is appropriately set within the scope of the invention. Can be changed.

  The sealed cooling tower of the present invention has a characteristic that the sprayed water to be dropped flows down over the entire side surface of the heat exchanger and can perform heat exchange efficiently. It can be widely applied to cooling towers.

It is a front view of the partial cross section which shows 1st Example of the closed type cooling tower of this invention. The heat exchanger used for the hermetic cooling tower is shown, (a) is an overall perspective view, (b) is an embodiment of the upper end of the heat exchanger, and (c) is another example of the upper end. Example (d) shows still another example of the upper end portion. The example of dripping of the sprayed water dripped at the upper end part of the heat exchanger used for the hermetic cooling tower is shown, (a) is an example of dripping on the ridgeline and / or the vicinity thereof, and (b) is the sprayed water regulation. The example which arrange | positions a member is shown. It is a perspective view of the whole heat exchanger which shows 2nd Example of the enclosed cooling tower of this invention. It is a front view of the partial cross section which shows the Example of the conventional hermetic cooling tower. It is a perspective view of the whole heat exchanger used for the hermetic cooling tower. It is a front view which shows the scattering state of the sprayed water sprayed on the same heat exchanger.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sealing type cooling tower 2 Heat exchanger 21 Plate 2a Upper end part of heat exchanger 2b Side end part of air inflow side of heat exchanger 8 Tower G G Sprayed water regulating member

Claims (4)

  In a closed cooling tower where a heat exchanger is arranged in the tower and sprayed water is dropped onto the heat exchanger to cool the refrigerant circulating in the heat exchanger by latent heat of evaporation, the upper end of the heat exchanger is turned up A hermetic cooling tower having a convex inclined surface or curved surface.   The sealed type according to claim 1, wherein sprayed water is dropped on the ridge line of the upper end portion of the heat exchanger formed on the inclined surface or curved surface convex upward or / and in the vicinity thereof. cooling tower.   The hermetically sealed type according to claim 1, wherein a sprayed water regulating member that regulates a dripping range of the sprayed water is disposed above a plurality of heat exchangers arranged in parallel at a predetermined interval. cooling tower.   4. The hermetic cooling tower according to claim 1, wherein a side end portion on the air inflow side of the heat exchanger is formed into a convex inclined surface or a curved surface toward the air inflow side.

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