JP6464648B2 - cooling tower - Google Patents

Description

  The present invention relates to a cooling tower installed in a cooling water system, and more particularly to a cooling tower configured to prevent scale from adhering to a filler in the cooling tower.

  Cooling towers that spray water from a water spray plate to a filler and cool the water by latent heat of vaporization are widely used in air conditioners and the like. The cooling water flows down while passing through the filler. The cooling tower is provided with a fan, and an air flow passes from the outer peripheral side of the filler to the central side of the cooling tower.

  In such a cooling tower, the cooling water that flows down the outer edge region of the cooling tower is blown toward the center of the cooling tower by the air flow, so that the cooling water is less likely to be applied to the outer edge of the filler. As a result, wetting and drying are repeated at the outer edge portion of the filler, and impurities such as silica contained in the cooling water are concentrated and adhered as a scale.

  Japanese Patent Laid-Open No. 2013-210136 describes that in order to prevent the scale of the filler material from being wet and dried due to repeated stoppage and operation of the cooling system, the makeup water is sprayed onto the filler material when the cooling system is stopped. It is described to prevent and prevent scale generation.

JP 2013-210136 A

  According to the cooling tower disclosed in Japanese Patent Laid-Open No. 2013-210136, scale generation due to wetting and drying accompanying the on / off operation of the cooling system is prevented, but scale generation due to wetting and drying at the outer edge of the filler cannot be prevented.

  That is, as described above, the scale that adheres to the outer edge (the edge along the outer periphery of the cooling tower) of the filler passes through the filler as the outer edge gets wet when the cooling water is applied to the outer edge. It is generated by repeated drying of the outer edge by air flow.

  Therefore, the generation of scale at the outer edge of the filler cannot be prevented even if the filler is sprinkled when the cooling system is stopped.

  An object of the present invention is to provide a cooling tower capable of solving the above-described conventional problems and preventing scale generation due to wetting and drying at the outer edge of the filler.

  The cooling tower of the present invention includes an upper water tank, a filler into which water flowing out from the water spray plate of the upper water tank is poured, a lower water tank arranged below the filler, and an outer peripheral surface side of the filler. In a cooling tower having a fan for allowing an air flow to pass to the inner peripheral surface side, a tray for receiving the falling water from the watering plate is disposed in a region along the outer edge portion of the upper surface of the filler, A hole for allowing water to flow out is provided on the outer edge side of the bottom plate of the tray.

  In one aspect of the present invention, the bottom plate of the tray has a gradient so as to be lower toward the outer edge side.

  In one aspect of the present invention, the bottom plate of the tray is provided with a rib extending in a flowing water gradient direction.

  In one aspect of the present invention, the holes include a first row of holes along the outer edge of the tray, and a second row of holes that are farther from the outer edge than the first row. The positions of the holes in the eye and the holes in the second row are shifted in the direction along the outer edge of the tray.

  In one aspect of the present invention, a dam is provided upright on the edge along at least the outer edge of the tray.

  In the cooling tower of the present invention, the water dropped from the outer edge of the water spray plate falls on the tray and is guided by the tray to be supplied to the outer edge of the filler, so that the outer edge of the filler is always wet with water. Maintained. Thereby, wetting and drying of the outer edge of the filler is prevented, and scale generation at the outer edge of the filler is prevented (including suppression).

  Moreover, when the scale inhibitor is contained in the cooling water, the scale inhibitor is always present at the outer edge of the filler, and this also prevents the generation of scale at the outer edge of the filler.

  By providing a running water gradient on the bottom plate of the tray that is lower on the outer edge side, water flows smoothly on the tray. In this case, by providing ribs extending in the direction of the flowing water gradient, water flows out from the holes on the outer edge side of the tray.

  As the holes in the tray bottom plate, a hole in the first row along the outer edge and a hole in the second row separated from the outer edge are provided, and a hole in the first row and a hole in the second row are provided. By making the arrangement shifted in the outer edge direction, the water flowing on the tray bottom plate is likely to flow almost uniformly from the holes in the first row and the second row.

  By providing a weir on the edge along at least the outer edge of the tray, it is possible to prevent water from overflowing from the tray.

It is a schematic longitudinal cross-sectional view of the cooling tower which concerns on embodiment. FIG. 2 is an enlarged view of the vicinity of the tray in FIG. 1. (A) A figure is a top view of a tray, (b), (c) figure is the BB line of FIG. (A) figure, and CC line sectional drawing. It is a longitudinal cross-sectional view of a part of a cooling tower according to another embodiment. It is a longitudinal cross-sectional view of a part of a cooling tower according to still another embodiment.

  Hereinafter, embodiments will be described with reference to the drawings.

  1-3 show the cooling tower of the open circulation cooling water system based on 1st Embodiment.

  The cooling tower 1 includes a casing (a tower body) 2, and a lower water tank (pit) 4 for cooling water is provided at the bottom. A louver 3 is provided on a side surface of the casing 2 to form an air inlet. A filler 5 is accommodated in the casing 2, and an upper water tank 6 is installed above the filler 5. The bottom plate of the upper water tank 6 is constituted by a watering plate 6a having a large number of small holes 6b (FIG. 2). A vacant chamber 7 is provided in the central portion of the casing 2 (central portion in plan view), and a fan 8 is provided above the vacant chamber 7.

  The suction side of the pump 9 is connected to the bottom of the lower water tank 4, and the discharge side of the cooling pump 9 is connected to one end of the heat exchanger 12 via the cooling water forward pipe 10. The other end of the heat exchanger 12 can be poured into the upper water tank 6 of the cooling tower 1 through a cooling water return pipe 13.

  Although not shown in the drawing, the lower aquarium 4 is provided with a ball tap to which a water supply pipe for supply water (ground water, tap water, industrial water, etc.) is connected, and the water level of the lower aquarium 4 is maintained within a set range. ing. The lower water tank 4 is provided with a blow pipe having a blow valve (or a blow pump) and an overflow pipe.

  A tray 20 that receives water that has dropped from the water spray plate 6 a is installed on the outer edge (casing 2 side) of the upper surface of the filler 5. The tray 20 is inserted into the space between the upper water tank 6 and the filler 5 and is placed on the upper surface of the filler 5.

  The tray 20 includes a rectangular bottom plate 21, leg portions 22 made of ridges provided on the lower surface of one long side of the bottom plate 21, and a weir erected from the upper surface of the other long side of the bottom plate 21. 23, a number of holes 24 provided in a region of the bottom plate 21 along the weir 23, a weir 25 erected from the upper surfaces of both short sides of the bottom plate 21, and the upper surface of the bottom plate 21 parallel to the weir 25 And a guide rib 26 made of a protruding line.

  The holes 24 are separated from the weir 23 by the first row of holes 24 provided in a line at regular intervals in the direction along the weir 23, and are parallel to the weir 23. And holes 24 in the second row provided at the same interval as the first row in the direction. The holes 24 in the second row are arranged so as to be shifted from the holes 24 in the first row so as to be positioned between the holes 24, 24 in the first row.

  In this case, the distance between adjacent edges of the holes 24 adjacent to each other in the direction parallel to the extending direction of the weir 23 is preferably 1 to 4 times, particularly 2 to 3 times, the diameter of the holes 24. If it does in this way, the water which passed between the holes 24 and 24 of the 2nd row falls in the hole 24 of the 1st row, and is substantially equal from the hole 24 of the 1st row, and the hole of the 2nd row. Water flows down at the flow rate.

  The hole 24 is preferably a circular hole having a diameter of 3 to 10 mm, particularly about 4 to 7 mm. From such a hole, water tends to fall linearly.

The tray 20 may be installed so that the hole 24 is positioned within a range of ± 50 mm, preferably ± 30 mm, particularly ± 10 mm, in the horizontal direction from the outermost edge 5 f (FIG. 2) at the upper end of the filler 5. preferable. The width W ₁ (FIG. 2) of the tray 20 is preferably about 10 to 25%, particularly about 15 to 20% of the width W ₂ (FIG. 1) of the upper surface of the filler 5.

  In this embodiment, the outer peripheral edge of the upper water tank 6 is located above the outer edge of the filler 5, but may be located slightly inward from that.

  In the cooling tower configured as described above, water is poured onto the upper surface of the filler 5 from the small holes 6 b of the water spray plate 6 a of the upper water tank 6. A portion of this water evaporates and cools while it travels down the filler 5. The cooled water flows and circulates in the order of the pump 9, the circulation outward pipe 10, the heat exchanger 12, and the circulation return pipe 13.

  In this embodiment, the tray 20 is disposed in the vicinity of the outer edge portion of the upper surface of the filler 5, and the water that has fallen from the small holes 6 b in the vicinity of the outer edge portion is received by the tray 20. The water on the tray 20 flows down the bottom plate 21 and is supplied from the hole 24 to the outermost edge side of the filler 5. As a result, the outermost edge 5f of the filler 5 is always wet with water, and scale generation is prevented.

  In addition, when the tray 20 is removed, the water flowing down the outer edge side of the filler 5 is separated from the outer edge side by being pushed by the air flow flowing from the outer edge side toward the empty chamber 7. Easy to do. For this reason, the outer edge is repeatedly dropped or not splashed with water, wet and dry, and scale is generated.

  In this embodiment, the tray 20 is provided with legs 22, and a running water gradient is formed on the bottom plate 21 so that the outer edge side of the tray 20 is low and the legs 22 are high. Therefore, the water dropped on the tray 20 smoothly flows toward the water-side hole 24 and flows out from the hole 24.

  In this embodiment, the bottom plate 21 is provided with a plurality of ribs 26 extending in the direction of the flowing water, so that the water dropped on the bottom plate 21 is on one short side (one weir 25 side). Unbiased is prevented.

  Moreover, since the holes 24 in the first row and the holes 24 in the second row are staggered as the holes 24, water flows in the second row when flowing on the bottom plate 21 according to the running water gradient. The holes reach the holes 24 of the eyes and the holes 24 of the first row, respectively, and flow out of the holes 24 uniformly. The end of the rib 26 on the underwater side is separated from the underwater weir 23. Further, the water-side end of the rib 26 is separated from the long side of the bottom plate 21 on the water-side (the leg 22 side). However, the water side of the rib 26 may reach the long side of the bottom plate 21 on the water side.

  In this embodiment, since the weirs 23 and 25 are provided on the three sides of the tray 20, the water on the tray 20 does not flow over the weirs 23 and 25 on the three sides.

  The second and third embodiments will be described with reference to FIGS.

  In the embodiment of FIG. 4, the water splash prevention plate 27 is attached so as to hang down from the outer peripheral edge of the upper water tank 6. The lower end of the plate 27 is located on the inner side (vacant chamber 7 side) than the weir 23. By providing the plate 27 in this manner, even when water falling on the tray bottom plate 21 splashes, it is possible to prevent water droplets from splashing to the outside, and to prevent water scattering loss.

  The other configurations in FIG. 4 are the same as those in the above embodiment. Instead of attaching the plate 27, a tray having a high weir 23 may be used.

  The present invention can also be applied when the distance between the upper water tank 6 and the filler 5 is smaller than shown.

  In the above-described embodiment, only one stage of the filler 5 is provided, but a plurality of stages may be provided at intervals in the vertical direction. In this case, as shown in FIG. 5, it is desirable to install the tray 20 not only on the uppermost filler 5 but also on the upper surface of the lower filler 5 in the same manner as the uppermost filler 5.

  In the embodiment described above, a weir may be provided along one long side of the tray 20 on the leg 22 side. By doing so, it is possible to prevent water from overflowing from the tray even when the running water gradient of the tray is small or there is no running water gradient.

  Although this invention is not specifically limited, this invention can be suitably employ | adopted for a square-shaped cooling tower among cooling towers.

  The tray 20 is preferably made of stainless steel (SUS) or vinyl chloride resin (PVC), which is free from corrosion or deformation, and is more preferably made of PVC because of its ease of processing and low cost.

  Although the shape of the tray is not limited, it is desirable that the outer shape is a square because it is easy to install in the gap between the watering plate and the filler and easy to manufacture. The size of the tray is preferably about 150 to 200 mm in length and about 400 to 450 mm in width considering that it can be easily applied to cooling towers of various sizes. The thickness of the tray is not limited as long as it is strong enough not to be deformed by use, but a thinner one is desirable because it is easier to install.

  In the above embodiment, the flowing water gradient is formed by providing the leg portion 22 on one side of the lower surface of the bottom plate 21, but the flowing water gradient may be formed by curving the bottom plate 21 concavely.

  The applied cooling water system of the present invention may be the open cooling water system shown in FIG. 1, or may be a sealed cooling water system (not shown). In a sealed cooling water system, the filler is a copper pipe through which a coolant is passed. When the present invention is applied to a hermetic cooling water system, water is poured evenly over the entire copper pipe, so that corrosion of the copper pipe is prevented.

[Example 1]
When a tray 20 was installed and operated for one year in a 100RT square cooling tower of an air-conditioning cooling water system in a department store, it was confirmed that slime generation on the surface of the filler was suppressed as well as prevention of scale adhesion.

  The size of the tray 20 is 450 × 200 mm, and the leg height is 8 mm. The diameters of the holes 24 are 5 mm and are arranged in two rows at a pitch of 10 mm. Three trays were installed per side of the cooling tower.

  The cooling tower was markedly contaminated with the filler until the tray was placed, and on average it had to be cleaned every 3 months.

DESCRIPTION OF SYMBOLS 1 Cooling tower 4 Lower water tank 5 Filler 6 Upper water tank 6a Sprinkling plate 20 Tray 23,25 Weir 24 Hole 26 Rib

Claims (5)

An upper water tank, a filler into which water flowing out from the water spray plate of the upper water tank is poured, a lower water tank disposed below the filler, and an air flow from the outer peripheral surface side to the inner peripheral surface side of the filler A cooling tower having a fan for passing the
In a region along the outer edge of the upper surface of the filler, a tray for receiving the falling water from the watering plate is disposed,
Width _{W 1} of the tray is 10% to 25% of the width _{W 2} of the upper surface of the filling material,
A cooling tower characterized in that a hole for allowing water to flow out is provided on the outer edge side of the bottom plate of the tray.   2. The cooling tower according to claim 1, wherein the bottom plate of the tray has a gradient so as to become lower toward the outer edge side.   The cooling tower according to claim 2, wherein a rib extending in a flowing water gradient direction is provided on a bottom plate of the tray. 4. The hole according to claim 1, wherein the hole includes a first row of holes along an outer edge of the tray, and a second row of holes spaced from the outer edge of the first row. ,
The cooling tower according to claim 1, wherein the holes in the first row and the holes in the second row are displaced in a direction along the outer edge of the tray.   5. The cooling tower according to claim 1, wherein a weir is provided at an edge along at least the outer edge of the tray.

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