JP6375787B2 - Cooling tower and its weir device - Google Patents

Description

  The present invention relates to a weir device installed in a lower water tank of a cooling tower of an open circulation cooling water system, and more particularly to a weir device installed in an upper edge portion of a water collecting tank of the lower water tank. Moreover, this invention relates to the cooling tower provided with this weir apparatus.

  Cooling towers are installed outdoors for the purpose of cooling water used in factories and air conditioning equipment. Inside this cooling tower, water is poured into the filler, and the air taken in from the outside of the cooling tower is brought into direct contact with water, heat transfer utilizing these temperature differences, so-called sensible heat cooling, and water itself The temperature of water is lowered to a predetermined range by using evaporation of the water, so-called cooling by latent heat. The cold water whose water temperature has dropped falls into the lower water tank at the lower part of the cooling tower, and is sent from the water collection tank provided in the lower water tank to the heat exchanger via the circulation pipe.

  In such a cooling tower, foreign matters such as solid matter enter from the outside by taking in air from the outside. Further, as described above, since the cooling water evaporates in the cooling tower, the cooling water is concentrated and dissolved substances in the water are likely to precipitate. After depositing as a scale with a filler or the like in the cooling tower and then peeling off from the filler, the scale accumulates as a solid in the lower water tank of the cooling tower.

  If solids that have entered from the outside or scales deposited from the cooling water flow out from the water collecting tank of the lower water tank to the circulating water pipe, there is a risk of adverse effects or problems on each part of the water circulation system. Patent Document 1 describes that a weir is provided so as to surround the upper edge of the water collection tank to prevent foreign matter accumulated on the bottom of the lower water tank from flowing into the water collection tank.

JP 2009-168401 A

  Since the shape and size of the inlet of the water collection tank differ depending on the manufacturer and the cooling capacity of the cooling tower, it was necessary to create a weir according to the size of the water collection tank of the target cooling tower. Around or inside the water collection tank of the cooling tower, a water supply device using a water supply pipe and a ball tap, a blow pipe, and a plate for a maintenance person to walk when maintaining the inside of the cooling tower are installed. For this reason, there is little free space around the water collection tank, and it took considerable labor to install a weir with the size of the water collection tank inlet, and in some cases there were cooling towers that could not be installed. .

  An object of the present invention is to provide a weir device that can be easily installed even in a place where there is little free space around a water collection tank, and a cooling tower equipped with this weir device.

  Moreover, this invention aims at providing the weir apparatus which can be installed even if the size of the water collection tank of a cooling tower differs, and the cooling tower provided with this weir apparatus in the one aspect | mode.

  The weir device of the present invention is a weir device installed in a cooling tower having a lower water tank and a water collecting tank recessed downward from the lower water tank, and is disposed on the lower water tank so as to surround the upper edge of the water collecting tank The dam device is constructed by connecting a plurality of dam parts so as to be disengageable.

  In the weir device of the present invention, it is preferable that the size surrounding the water collecting tank can be changed.

  The dam device according to the present invention is configured by combining the four dam parts into a rectangular frame shape, and one end side of one adjacent dam part is released from the other end side of the other dam part or in the longitudinal direction. It is preferable to be connected so that the connection position can be changed.

  This dam part includes a rail having a bottom seat portion arranged on the lower water tank, an upright piece rising from the bottom seat portion, and a horizontal piece perpendicular to one longitudinal end of the upright piece. The horizontal piece of one weir part is in contact with the rail of the other weir part and is connected so as to be disengageable by bolts and nuts. The other weir part extends in the longitudinal direction of the weir part. It is preferable that the existing slit for inserting the bolt is provided.

  It is preferable that a window opening is provided in the standing piece, and a mesh is provided so as to cover the window opening.

  The mesh is preferably provided on a mesh plate that can be attached to and detached from the rail.

  The weir device of the present invention preferably includes a downward projecting portion that is dropped into the water collecting tank.

  The cooling tower of the present invention is characterized in that in the cooling tower having a lower water tank and a water collecting tank recessed downward from the lower water tank, the weir device of the present invention is installed so as to surround the upper edge of the water collecting tank. To do.

  The weir device of the present invention is formed by connecting a plurality of weir parts so as to be disengageable, and can be assembled and installed in a cooling tower.

  In one aspect of the present invention, since the size of the weir device can be changed in accordance with the size of the water collecting tank, the weir device can be installed even if the manufacturer and model number of the cooling tower are different.

  The dam device according to one embodiment of the present invention has a rectangular frame shape, and the size of the frame can be freely adjusted by changing the connection position of adjacent dam parts.

  In this case, by providing a bolt insertion slit extending in the longitudinal direction of the weir part, the connection position of the adjacent one weir part to the other weir part can be freely and easily changed. be able to.

  In one aspect of the present invention, the weir part includes a rail having a bottom seat, an upright piece, and a lateral piece. This weir part can be stably placed on the bottom surface of the cooling tower, and the operation of connecting the weir parts can be easily performed. Moreover, the connection strength and rigidity of adjacent dam parts become high by abutting and connecting this horizontal piece with the standing piece of adjacent dam parts.

  In one aspect of the present invention, a mesh is provided on the weir part, and when the water level in the cooling tower is lowered, water can flow into the water collection tank through this mesh.

  By making the mesh detachable from the weir part, the mesh can be easily cleaned, inspected, replaced, and the like.

  The weir device is provided with a downward projecting portion, and the downward projecting portion is dropped into the water collecting tank, thereby preventing the displacement of the weir device.

(A) The figure is a top view of the weir device which concerns on embodiment, (b) The figure is a side view of this weir device. It is a top view of the state which made small the aperture size of the weir apparatus of FIG. It is a perspective view of the weir apparatus of FIG. It is a disassembled perspective view of the weir apparatus of FIG. 4A is a cross-sectional view taken along line VV in FIG. 4, FIG. 4B is a cross-sectional view of a state where the mesh plate is assembled to the rail, and FIG. 5C is a perspective view of an end portion of the mesh plate. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG.1 (b). It is a disassembled perspective view of the dam part which concerns on another embodiment. It is a typical longitudinal section of a cooling tower provided with a weir device.

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

  FIG. 9 shows a flow of cooling tower equipment provided with the weir device according to the embodiment of the present invention. From the watering device 2 of the cooling tower 1, the cooling water (circulated return water) heated by a heat exchanger 12 such as a refrigerator is sprinkled, cooled in contact with the outside air taken in by driving the fan 5, It collects in the lower tank 4. Cooling water in the lower water tank 4 is circulated from the water collection tank 6 through a circulation pump 10, a circulation forward pipe 11, a heat exchanger 12, and a circulation return pipe 13.

  An amount of new water corresponding to the amount of evaporation in the cooling tower 1 and the amount of splash loss and the amount of blow water from the blow valve 8 of the blow line 7 is replenished from the makeup water pipe 9.

  The water collection tank 6 is provided so as to be recessed downward from the bottom surface of the lower water tank 4. A weir device 20 is installed so as to surround the upper edge of the water collection tank 6.

  As clearly shown in FIGS. 1 to 7, particularly FIGS. 3 and 4, the dam device 20 is a combination of four dam parts 21 in a frame shape. Each dam part 21 includes a rail 30 and a mesh plate 50 and a blindfold plate 70 attached to the rail 30.

  The rail 30 has a substantially rectangular plate-shaped bottom seat portion 31 that overlaps the bottom surface of the lower water tank 4, a standing piece 32 that rises vertically from one long side of the bottom seat portion 31, and a window provided in the standing piece 32. An opening 33, a horizontal piece 34 perpendicularly intersecting one end in the longitudinal direction of the upright piece 32, an overhanging piece 35 projecting from the upper side of the upright piece 32 to the opposite side of the bottom seat portion 31, and the upright piece 32 side from the horizontal piece 34 A plurality of elongated slits 37 provided along the lower side of the standing piece 32 on the side opposite to the lateral piece 34 of the standing piece 32, and the side piece 34 side of the standing piece 32. The slit 38 provided along the lower side of the standing piece 32, the slit 39 provided along the lower side of the horizontal piece 34, and the longitudinal direction of the protruding piece 35 on the opposite side of the horizontal piece 34 of the protruding piece 35. Provided in the plurality of slits 40 extended to the overhanging piece 36. A slit 41, a locking pin 42 provided on each longitudinal end of the standing piece 32, and a bolt insertion hole 43 provided on the lower side of the window opening 33 near the middle of the standing piece 32 in the longitudinal direction. Have.

  As shown in FIG. 7, the bolt 46 for pressing the mesh plate 50 and the blindfold plate 70 is inserted into the bolt insertion hole 43 through the washer 45, and the nut 47 is tightened.

  As shown in FIGS. 4 and 5, the mesh plate 50 is fixed to the main plate portion 51 so as to cover the main plate portion 51 that overlaps the standing piece 32, the window opening 52 provided in the main plate portion 51, and the window opening 52. It has a mesh 53, a projecting piece 54 that projects from the upper edge of the main plate portion 51, and locking holes 55 that are provided on both ends of the main plate portion 51 in the longitudinal direction. As shown in FIG. 5, the locking hole 55 has a keyhole shape having a lower large-diameter hole 55a and a notch 55b rising upward from the large-diameter hole 55a. The left-right width of the notch 55b is smaller than the left-right width of the large-diameter hole 55a.

  In a state where the mesh plate 50 is attached to the rail 30, the mesh 53 faces the window opening 33 of the rail 30. In order to attach the mesh plate 50 to the rail 30, as shown in FIG. 5A, the main plate portion 51 is overlapped with the standing piece 32 of the rail 30, and the locking pin 42 is passed through the large-diameter hole 55a, and then the mesh plate 50 is stretched. Pull down until the protruding piece 54 contacts the protruding piece 35. Thereby, as shown in FIG. 5B, the locking pin 42 is engaged with the notch 55 b, and the mesh plate 50 is attached to the rail 30. On the contrary, the mesh plate 50 can be removed from the rail 30 by pulling the mesh plate 50 upward and then separating the main plate portion 51 from the standing piece 32.

  By making the mesh plate 50 detachable, the mesh plate 50 can be easily changed to a mesh plate 50 that matches the size of the foreign matter to be prevented from being mixed. In addition, there is an advantage that it can be easily cleaned.

  The mesh 53 has an opening of 10 to 40 mesh, although it depends on the size of the foreign matter to be prevented from being mixed. If the mesh is 10 mesh or less, it is insufficient to prevent the entry of foreign matter. If the mesh is 40 mesh or more, the mesh member may be clogged in a relatively short time, and the frequency of cleaning increases. Therefore, it is not desirable. As the material of the mesh 53, a material that does not cause elution in water is good, and any material that has a certain degree of strength and does not break or deform may be used. Examples of such materials include stainless steel and resin materials.

  In order to prevent foreign matter from passing through the slit 37 provided in the lower part of the weir part 21 and entering the water collecting tank 6, a blind plate 70 is provided outside the slit 37 so as to close the slit 37. Yes.

  In this embodiment, a corner part 60 is installed at a corner portion where adjacent weir parts 21 intersect. As shown in FIGS. 3, 4 and 6, the corner part 60 has an L shape in which the first piece 61 and the second piece 62 intersect perpendicularly. The first piece 61 is provided with a slit 63 in the horizontal direction, and the second piece 62 is provided with a slit 64 in the horizontal direction. In this embodiment, the slits 63 and 64 are provided in two upper and lower stages, respectively, but may be one stage or three or more stages.

  To assemble the weir device 20, four weir parts 21 are combined in a frame shape, and adjacent weir parts 21 are connected.

  In order to connect the adjacent weir parts 21 to each other, as shown in FIGS. 3, 4, and 6, the corner parts 60 are arranged at the corners of the standing pieces 32 and the horizontal pieces 34 of the weir parts 21, Bolts 66 are inserted into the slits 38 from the slits 64 on the side, and the corner parts 60 are fixed to the dam parts 21 by tightening nuts. In this embodiment, the corner part 60 is attached so as to protrude downward from the lower surface of the rail 30.

  Next, the horizontal piece 34 of one adjacent dam part 21 is brought into contact with the surface of the upright piece 32 of the other second dam part 21 opposite to the bottom seat portion 31. At this time, the lateral piece 34 of the one weir part 21 and the overhanging piece 36 are arranged below the overhanging piece 35 of the other weir part 21.

  Next, a bolt 65 is passed through the upper slit 63 of the first piece 61 of the corner part 60, the slit 39 of the horizontal piece 34, the slit 37 of the other dam part 21, and the small hole 71 of the blindfold plate 70, and the nut Tighten 65a. Further, a bolt 68 is passed from the slit 41 of the overhanging piece 36 to the slit 40 of the overhanging piece 35, and the nut 69 is tightened. Thereby, the adjacent dam parts 21 are connected. Further, one end side of the blindfold plate 70 is also fixed to the rail 30 by a bolt 65 and a nut 65a.

  As shown in FIGS. 3 and 7, the slit 37 is closed by attaching the blindfold plate 70 along the lower portion of the upright piece 32. As described above, one end side of the blindfold plate 70 is fixed to the rail 30 by the bolt 65 and the nut 65a. The other end side of the blindfold plate 70 is fixed to the standing piece 32 of the rail 30 by the bolt 46, the washer 45 and the nut 47. The washer 45 is disposed across the lower edge of the mesh plate 50 and the upper edge of the blindfold plate 70. As a result, the vicinity of the middle in the longitudinal direction of the mesh plate 50 is pressed against the upright piece 32 together with the other end side of the blindfold plate 70.

  Thus, the dam apparatus 20 comprised by combining and connecting the four dam parts 21 in a frame shape is arrange | positioned along the upper edge of the water collection tank 6. FIG. Each dam part 21 overlaps with the upper surface of the lower water tank 4 along the upper edge part of the water collection tank 6, and the corner part 60 is dropped into the corner part in the water collection tank 6. Thereby, the position shift of the weir apparatus 20 is prevented.

  The water in the lower water tank 4 passes over the weir device 20 and flows into the water collecting tank 6. When the water level in the lower water tank 4 decreases, the water in the lower water tank 4 passes through the mesh 53 and flows into the water collection tank 6. The scale deposited in the lower water tank 4 is dammed by the weir device 20 and does not enter the water collection tank 6.

  This dam device 20 can change the magnitude | size of a frame freely by making the connection site | parts of the dam parts 21 differ. In FIG. 1, the weir device 20 has the largest frame size (caliber size), and in FIG. 2, the frame size is the smallest. In FIGS. 1 and 2, the frame is a square, but it may be a rectangular frame.

  Since this dam device 20 is formed of four dam parts 21 that can be separated from each other, it is easy to transport to the site where the cooling tower is installed. In many cases, the cooling tower is installed at a high altitude outdoors, and it may be necessary to climb a ladder. Therefore, it is desirable from the viewpoint of safety and labor saving that the cooling tower can be transported in as compact a state as possible. In addition, the lower water tank 4 of the cooling tower is provided with accessory parts such as a water supply device, blow piping and a walking board for maintenance, so there is unexpectedly little free space around the inlet of the water collecting tank 6, It is not easy to install an assembled weir. Since the dam device 20 is formed of the dam parts 21 that can be divided, it can be easily assembled and installed in the cooling tower.

  Further, the size of the surrounding frame can be changed according to the size or shape of the inlet of the water collecting tank 6. Therefore, even if the manufacturers and cooling capacities of the cooling towers are different, the size of the surrounding frame can be changed in accordance with the inlet of the water collecting tank, so that the corresponding range that can be installed on site is large. It is economical because it is not necessary to create several types of weir parts according to the size and shape of the water collection tank. Moreover, the trouble that a dam device cannot be installed can be eliminated.

  Since the bolt 65 that connects the adjacent weir parts 21 and 21 is inserted into the horizontally long slits 61, 39, and 37, the size of the surrounding frame can be adjusted steplessly, and fine adjustment is also possible. . Further, the connection workability is good at the time of installation in the cooling tower.

  In this embodiment, the corner parts 60 are dropped into the four corners of the water collection tank 6, so that the displacement of the weir device 20 is prevented.

  Since the weir device 20 of the present invention is installed in the lower water tank of the cooling tower, it is desirable to use a material that does not deform in water as a material, and that does not have an eluate from the material, It is preferable to use stainless steel or resin material. If the specific gravity of these materials is large, they will not move easily in the lower tank just by placing them in the water. However, since the water flow is generated in the lower tank due to the circulation of cooling water, the installed weir is connected to the inlet of the water collection tank. There is a risk of foreign matter flowing into the water intake strainer. The corner part 60 prevents this displacement.

  In this embodiment, the weir part 21 has an L-shaped cross section having a bottom seat portion 31 and an upright piece 32. For this reason, when the weir device 20 is installed in the lower water tank, it can be stably disposed on the bottom surface of the water tank. Further, when the foreign matter has gathered around the weir together with the flow of water, the foreign matter can be guided onto the bottom seat portion 31 so that the foreign matter does not enter the inlet of the water collecting tank. Since foreign matters such as scale and sludge are accumulated around the weir, they can be easily cleaned by suctioning and removing them with an underwater vacuum cleaner during cleaning.

  Since foreign matters such as solids and scales taken from the outside of the cooling tower 1 have settled in the lower water tank 4, the foreign substances hardly enter the water collecting tank if a weir is provided. However, when the side surface portion of the weir is a plate-like thing that cannot circulate water, when circulating cooling water is sucked from the water collection tank by the circulation pump, turbulent flow is generated in the lower water tank 4 and has settled. Foreign matter sometimes crossed the weir and flowed into the water collection tank. By adopting the mesh 53 on the side surface of the weir part 21, the water in the lower water tank flows into the water collecting tank through the mesh 53, so that foreign matter can be prevented from crossing the weir.

Further, immediately after the operation of the circulation pump is started, the inside of the lower water tank 4 tends to be at a low water level. If the height of the weir is high and the side surface of the weir is a plate-like one that cannot circulate water, there is a risk that the water flowing into the water collection tank 6 will be insufficient and air may enter the circulating water pipeline. By making the side surface portion of the weir into the mesh 53, water flows into the water collection tank 6 through the mesh 53 even when the lower water tank 4 has a low water level, so that it is possible to prevent air from entering the circulating water pipe.
The aforementioned blindfold 70 serves to close the slit 37 and prevent foreign matter from passing through the slit 37, but the amount of water flowing from the lower water tank 4 to the water collecting tank 6 tends to be insufficient, and from the slit 37. When the foreign matter can be stopped by the upright piece 32 having a slightly lower height, it can be used with the blindfold plate 70 removed.

  Thus, according to the present invention, it becomes possible to install a weir for reducing strainer clogging in cooling towers of all manufacturers and cooling capacities, and not only can prevent strainer clogging, Since the foreign matters that are prevented from moving to the water collecting tank are gathered at the lower part of the weir, the cleaning effort for removing these foreign substances from the lower water tank of the cooling tower can be significantly reduced.

  In order to reduce clogging of the cooling tower strainer, there are many methods to remove suspended solids in the circulating water, but foreign matter taken in from outside in the open circulating cooling water system or scale pieces dropped from the cooling tower packing It has been found that most of them sink into the water and are swept down the bottom of the lower tank and carried to the strainer. According to the apparatus of the present invention, since foreign matters such as scales are prevented from flowing into the strainer of the intake port, it is possible to prevent clogging of the strainer of the intake port. The effect of preventing clogging of the Y-type strainer installed in the can also be obtained.

  The weir part used in the apparatus of the present invention has a simple structure. In addition, it can be installed in the cooling tower of each manufacturer by preparing several types of the same basic structure although the length is different, and the capital investment cost can be kept low.

  Although the length of the weir part 21 depends on the scale of the cooling tower, it is usually possible to install it in most square cooling towers if several types are produced between 400 and 1500 mm. For example, four main body members of 400 mm, 700 mm, 1000 mm, 1300 mm, and 1500 mm in length are manufactured, and the length can be changed to approximately 200 mm by using a slit. Is possible. If weir parts 21 having the same length are used, a square weir can be easily formed, and if weir parts 21 having different lengths are used, a rectangular inlet can be easily accommodated.

  Although the height of the weir depends on the water level setting in the lower water tank 4 of the cooling tower, it is usually desirable that the height is 50 to 100 mm. Immediately after the operation of the circulation pump is started, circulating water to the cooling tower is temporarily insufficient and the inside of the lower aquarium tends to become a low water level. Even when the mesh 53 is attached, the mesh 53 is small, When 53 is clogged with foreign matter or the like, the amount of water passing through the mesh 53 is not in time, and air may enter the circulating water pipe. If the height exceeds 100 mm, there is a risk of air intrusion as described above. If the height is 100 mm or less, the weir is submerged in the water in the lower water tank during normal operation of the cooling tower, and does not prevent water from flowing into the water collection tank. Further, even immediately after the start of the operation of the circulation pump, there is a time allowance until the water level becomes lower than the height of the weir, so that there is little possibility of air entering the circulation water pipe by suction of the circulation pump. If the height of the weir is lower than 50 mm, foreign matter that sinks to the bottom of the lower water tank due to turbulence may cross the weir, which is not desirable.

  By providing the L-shaped corner parts 60 on a pair of diagonal portions of the square weir, it is possible to prevent the weir from moving around the inlet of the water collecting tank 6. The corner parts 60 are installed at the corners of the assembled weirs to increase the strength of the weirs and play a role of preventing deformation. In order to prevent the weirs from moving, at least a pair of diagonal portions of the weirs However, in order to increase the strength, it is desirable to install in four corners. Since the corner part 60 is provided with a plurality of slits 63 and 64, the corner part 60 can be formed as a weir by inserting a bolt 66 into a slit of a different stage or by turning the corner part 60 upside down. It can be installed so that it does not protrude below the bottom, or the protruding length can be changed to 1 cm, 5 cm, or the like. The protruding length may be selected according to the size or weight of the weir and the situation at the site.

  However, the means for preventing the movement of the weir is not limited to this type. For example, a flat steel plate may be provided below the four sides of the weir so as to protrude below the bottom surface of the weir.

  That is, in this embodiment, a corner part 60 that is separate from the rail 30 is used, but a rail 30A in which a corner part 60A is integrally provided as shown in FIG. 8 may be used. The other configuration of the rail 30A is the same as that of the rail 30, and the same reference numerals indicate the same parts.

[Example 1]
The weir device of the present invention was installed in the lower water tank in the open circulation cooling tower installed in the pharmaceutical factory. When 4 months passed, scale and sludge were accumulated around the device, but deposits were hardly seen in the water collection tank and near the intake strainer.

  Conventionally, the small scale that has passed through the strainer clogs the water sprinkler at the top of the cooling tower, but no clogging is observed at all.

[Example 2]
Conventionally, it has been necessary to clean a 40-mesh strainer attached to a water intake in an open circulation cooling tower of a major supermarket once every two weeks. By installing the weir device of the present invention around the water collection tank, clogging of the 40 mesh strainer was hardly seen even after 2 weeks, and clogging was reduced. A lot of scale pieces and sludge accumulated around the weir device.

  These scale pieces and sludge could be easily cleaned by sucking and removing them with an underwater vacuum cleaner.

  From the above, it was confirmed that the strainer clogging was reduced by installing the weir device of the present invention.

1 Cooling tower 4 Lower water tank (pit)
6 Water collecting tank 20 Weir device 21 Weir part 30 Rail 31 Bottom seat part 32 Standing piece 33 Window opening 34 Horizontal plate 50 Mesh plate 53 Mesh 60 Corner part 70 Blindfold plate

Claims (7)

A weir device installed in a cooling tower having a lower water tank and a water collecting tank recessed downward from the lower water tank,
In the weir device arranged on the lower water tank so as to surround the upper edge of the water collecting tank,
It is configured by connecting multiple weir parts so that they can be disconnected ,
A dam device characterized in that the size surrounding the water collecting tank can be changed . In Claim 1 , it is a dam device constituted by combining the four dam parts into a rectangular frame shape,
A weir device characterized in that one end side of one adjacent weir part is connected to the other end side of the other weir part or in the middle of the longitudinal direction so that the connection can be released and the connection position can be changed. 3. The rail according to claim 2 , wherein the dam part includes a bottom seat portion disposed on the lower water tank, a standing piece rising from the bottom seat portion, and a horizontal piece perpendicular to one end side in the longitudinal direction of the standing piece. With
The side piece of one adjacent weir part is in contact with the rail of the other weir part and is connected so as to be disengaged by a bolt and a nut.
The dam device characterized in that the other dam part is provided with a bolt insertion slit extending in the longitudinal direction of the dam part. In Claim 3 , the upright piece is provided with a window opening,
The dam device is provided with a mesh covering the window opening. 5. The weir device according to claim 4 , wherein the mesh is provided on a mesh plate detachable from the rail. The weir device according to any one of claims 1 to 5 , further comprising a downward projecting portion that is dropped into the water collecting tank. In the cooling tower having a lower water tank and a water collecting tank recessed downward from the lower water tank, the weir device according to any one of claims 1 to 6 is installed so as to surround an upper edge of the water collecting tank. A cooling tower characterized by

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