JP2005233553A - Water piping structure of large-scaled cooling tower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water piping structure of a large-scaled cooling tower capable of easily performing its installation work, easily accessing to the cooling tower in maintenance, and reducing an installation space. <P>SOLUTION: In this water piping structure 13 of the large-scaled cooling tower 10 comprising a mount 12, a plurality of cooling tower units 11 mounted on the mount and comprising a collection tub at the center of a lower face, a returning-way pipe for delivering the returned circulated water to the cooling tower units 11, and a going-way pipe for delivering the circulated water from the collection tub, the returning-way pipe comprises a returning-way head pipe 37 mounted between the collection tub and a leg 27 of the mount, and the going-way pipe comprises a going-way head pipe 38 mounted between the collection tub and the other leg 27 of the mount 12. <P>COPYRIGHT: (C)2005,JPO&amp;NCIPI

Description

  The present invention relates to a piping structure for a large cooling tower installed on the roof of a building, and more particularly to a water piping structure for circulating water in a large cooling tower composed of a plurality of cooling units.

Japanese Utility Model Publication No. 6-65789 JP 7-305995 A

  FIG. 6 shows a cooling tower installed on the roof of a building. This cooling tower 100 receives and cools the cooling water used for cooling the condenser of the refrigerator, and sends it out again for use as cooling water for the condenser. The return side cooling water returning to the cooling tower passes through the inlet pipe 101 extending in the vertical direction from the return pipe, reaches the upper water tank (sprinkling plate) 102, falls from there, and eventually flows down the filler 103. At that time, the fan 104 is rotated by the motor M at the top of the cooling tower to generate an updraft in the central duct 104a, and the outside air is applied to the water flowing down the filler 103. As a result, the water is cooled while being in contact with the outside air, collected in the water collecting tank 105 at the center of the lower surface of the cooling tower 100, passing through the horizontally extending outlet pipe 106, and again supplied as cooling water to the condenser or the like through the forward pipe. The

  The cooling tower lower piping which receives and sends out these cooling waters is usually connected to the return pipe 107 and the outgoing pipe 108 which are arranged on the roof or the like in parallel with the cooling tower 100 as shown in FIGS. The pipes are connected via the branch pipe 109 and the flexible joint 110, and the pipes are connected by a flange joint or the like. Reference numeral 111 denotes a water collection tank. In addition, the cooling tower 100 is installed on a pedestal 112 configured in a frame shape from an angle material or the like, and the gantry is fastened on the concrete foundation 113 with anchor bolts. Then, after the installation work for the cooling tower 100 and the piping work for the return pipe 107 and the outgoing pipe 108 are completed, the cooling tower lower piping work described above is performed.

  The above piping work becomes complicated when there are a plurality of cooling towers 100. Further, since the return pipe 107 and the forward pipe 108 are arranged in parallel on the rooftop or the like, the periphery of the cooling tower 100 is blocked with piping, so that it is difficult for an operator to approach and work. In addition, the flexible joint is necessary to withstand earthquakes and vibrations. However, as the number of cooling towers increases, the number of parts used increases and the cost of parts increases.

  In Patent Document 1, in order to solve such a problem, as shown in FIGS. 9a and 9b, a part 107a of the return pipe (or the forward pipe) is passed through the cooling tower (unit) 100 in advance. It has been proposed to branch into the upward piping 107b in the middle of the installation. In this case, since the partial return pipe 107a divided into B in the width of the unit 100 is integrated with the cooling tower, only the required number of units are brought into the installation site, and the return pipe 107a is joined while combining the units. They are concentrically arranged and connected to form one pipe. Therefore, the lifting work by the crane becomes relatively easy, and the final piping work becomes easy. Further, Patent Document 1 proposes that both the return pipe 107 and the outgoing pipe 108 are incorporated in the unit 100.

  On the other hand, in Patent Document 2, as shown in FIG. 10, the fan 104 and the duct 120 are integrated into a ventilation fan unit 121 and a heat exchanging unit 122 arranged adjacent to the fan unit 121. The separation-type cooling tower 123 that is integrated with each other is disclosed. In this device, a water collecting tank 124 having the same flat area is integrated under the heat exchange unit 122, a header pipe 125 connecting a cooling water pipe is disposed below the ventilation fan unit 121, and the header pipe 125 is cooled. It proposes to integrate the tower.

  In the water piping structures of FIGS. 7 and 8, the installation work is complicated as described above, and the piping is installed around the cooling tower, so that it is difficult for the operator to maintain the cooling tower. On the other hand, the water piping structures of FIGS. 9a and 9b are easy to approach the cooling tower, but the centering work of the partial return pipe 107a (or the outgoing pipe) is difficult. That is, since each partial return pipe 107a is integrated with each cooling tower, it is necessary to align the center while shifting the cooling tower. Further, when both the return pipe 107 and the outgoing pipe 108 are incorporated in the unit, it becomes easier to approach the cooling tower, but it is extremely difficult to align both pipes. On the other hand, in the cooling tower 123 of FIG. 10, since the ventilation fan part (unit) 121 and the heat exchange part (unit) 122 are separate bodies, the space efficiency is low and a wide installation space is required.

  It is a technical object of the present invention to provide a water piping structure for a large cooling tower that is relatively easy to install, can easily access the cooling tower during maintenance, and requires less installation space.

  The water piping structure of the present invention (Claim 1) includes a frame-shaped gantry, a cooling tower mounted on the gantry and having a water collecting tank at the center of the lower surface, and a return tower used for cooling a condenser and the like. A water pipe structure of a large cooling tower having a return pipe for sending circulating water to the cooling tower and an outgoing pipe for sending the circulating water from the water collecting tank, wherein the return pipe is connected to the legs of the water collecting tank and the gantry. It arrange | positions between, The said outward piping is attached between the water collection tank and the other leg of the mount frame, It is characterized by the above-mentioned.

  In such a water pipe structure, the gantry supports a plurality of cooling towers arranged in a row, and the return line pipe passes between the water collecting tanks of the plurality of cooling towers and the legs of the gantry. The return pipe is composed of a return header pipe and an inlet pipe branched from the return header pipe to the inlet of each cooling tower, and the forward pipe passes between the water collecting tanks of the plurality of cooling towers and the other leg of the gantry. What is comprised from the return path header pipe | tube and the exit piping which connects the return path header pipe | tube and each water collection tank is preferable (Claim 2). Further, it is preferable that the return header pipe and / or the forward header pipe are unitized by being attached to each cooling tower or mount.

  In the case where the plurality of cooling towers are provided, it is preferable that the inlet pipe extends through the side of the water collecting tank and is further turned upward to be connected to the cooling tower (Claim 3).

  Further, a circulating water outlet pipe extends laterally from the forward header pipe, and the circulating water inlet pipe extends in parallel with the circulating water outlet pipe through the lower part of the water collection tank, and further extends obliquely upward to the pipe header pipe. Those which are connected sideways are preferred (claim 4). The main pipe of the return pipe may be connected to the end of the return header pipe, and the main pipe of the forward pipe may be connected to the end of the forward header pipe. . In those cases, it is preferable that a gate valve is interposed in the inlet pipe and the outlet pipe.

  In the water pipe structure of the present invention (Claim 1), the return pipe and the forward pipe are attached between the water collection tank and the legs of the gantry. That is, those pipes are accommodated below the cooling tower. Therefore, there are few piping around and it is easy for an operator to access. Furthermore, since there are few surrounding piping, the whole installation space can be made small. In addition, since piping can be arrange | positioned between foundations, it is not necessary to make height especially high. In addition, since the return pipe and the outgoing pipe are distributed across the water collection tank, even when the water is filled, the weight is balanced, and there is little uneven load on the gantry and the load is small. In addition, return piping and outbound piping can be installed at the factory. For this reason, it is only necessary to install the entire base on the foundation at the construction site and connect the return line pipe and the forward line pipe to the main pipe connected to the pump, the refrigerator, etc., and it is easy to make corrections as necessary. Further, even when additional cooling towers are added, ordinary pipes need only be connected to each other, and alignment between the cooling towers as in the case of FIG. 9 is unnecessary.

  The gantry supports a plurality of cooling towers arranged in a row, and the return pipe is a return path header pipe passing between the water collecting tanks of the plurality of cooling towers and the legs of the gantry, and the return path A return path header pipe that passes between the water collecting tank of the plurality of cooling towers and the other leg of the gantry, and the return path. When it comprises the header pipe and the outlet pipe that connects each water collecting tank (Claim 2), the whole of the plurality of cooling towers can be handled as one unit. Therefore, the installation work is easier than the case of individual installation. Furthermore, it is only necessary to connect the return pipe and the main pipe of the outgoing pipe one by one, and the number of use can be reduced even when a flexible joint is used.

  In the case where the plurality of cooling towers are provided, the water pipe structure in which the inlet pipe extends through the side of the water collection tank and is further turned upward to be connected to the cooling tower (Claim 3) The cooling tower and the forward header pipe can be connected by a long outlet pipe. Therefore, piping work is relatively easy. That is, even when the return header pipe and the water collection tank are connected by a short pipe, the connection position between the forward header pipe and the cooling tower is separated, so that the piping work between them is easy.

  A circulating water outlet pipe extends laterally from the outgoing header pipe, passes through the lower part of the water collection tank, extends in parallel with the circulating water outlet pipe, and further extends obliquely upward to laterally face the pipeline header pipe. (Claim 4), the main pipe of the return pipe and the forward pipe are perpendicular to the cooling tower row, so that the pipe length is small and the entire installation space is small. That's it.

  In a water pipe structure in which the main pipe of the return pipe is connected to the end of the return pipe header pipe, and the main pipe of the forward pipe is connected to the end of the forward header pipe (Claim 5), On the contrary, when the main pipe of the return pipe and the forward pipe are in the extending direction of the column of the cooling tower, the length of the pipe is small and the entire installation space is small.

  The water piping structure in which a partition valve is interposed in the inlet piping and the outlet piping (Claim 6) changes the number of cooling towers that operate according to the required heat load by opening and closing the partition valve. Can do. Therefore, heat exchange becomes efficient.

  Next, an embodiment of the water piping structure of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing an embodiment of a large (composite) cooling tower having the water piping structure of the present invention, FIG. 2 is a plan view showing the water piping structure of the large cooling tower in FIG. 1, and FIG. FIG. 4 is a plan view showing another embodiment of the water piping structure of the present invention, and FIG. 5 is a schematic side view showing still another embodiment of the water piping structure of the present invention. .

  A large cooling tower 10 shown in FIG. 1 includes three cooling tower units 11, a gantry 12 that is connected and supported in an integrated state, and a water piping structure 13 that is accommodated in the gantry 12. Reference numeral 14 denotes a concrete or steel (die steel) foundation that supports the gantry 12, and reference numerals 16 and 17 denote a return pipe and a forward pipe main pipe, respectively. Although omitted in the figure, the main pipes 16 and 17 are fixed on the rooftop of the building. The water piping structure 13 is supported on the gantry 12 with a hanging metal fitting or the like.

  The cooling tower unit 11 may be substantially the same as the cooling tower 100 shown in FIG. That is, each cooling tower unit 11 is provided with a filler unit (filler part) 21 at the front and rear as shown in FIG. 1, and a water collecting tank (FIG. 6) is provided at the lower end of a duct (104a in FIG. 3) and a fan 24 at the upper end. 1 may be provided only in the cooling tower units 11 at both ends, and may be omitted in the middle portion. However, it is preferable not to omit it in order to prevent air from entering from adjacent cooling towers.

  As the gantry 12, an angle material assembled into a frame shape or the like is used. That is, for example, three units of gantry units 28 including a rectangular frame portion 26 that supports the lower surface of each cooling tower unit 11 and leg portions 27 fixed to the four corners of each frame portion are used. In addition, the site | part with which members overlap can also be shared by one member. As shown in detail in FIG. 2, each frame portion 26 is configured by arranging small frames 29 for placing the filler unit 21 of the cooling tower unit 11 on the front and rear sides and connecting the small frames 29 with a connecting member 30. ing.

  Further, the front and rear small frames 29 are connected by a ladder-shaped member 31 that supports the water collecting tank 23. Plates 32 for fixing the cooling tower unit 11 are attached to the upper surfaces of the left and right ends of each small frame 29. The members may be connected together by welding, or may be fastened together by bolting or the like. Moreover, in this embodiment, in order to support the filler unit 21 firmly, as shown in FIG. A brace 34 is interposed between the small frame 29 and the legs 27 and 33, and the lower ends of the outer leg 27 and the inner leg 33 are connected to each other by a reinforcing member 35.

  As shown in FIG. 2, the water piping structure 13 passes through a return path header pipe 37 extending so as to penetrate below the rear small frame 29 arranged in a row and below the front small frame 29. And an outward header pipe 38 extending in the direction. Since the return path header pipe 37 passes under the small frame 29, it passes between the outer leg 27 and the water collecting tank 23 as shown in FIG. Returning to FIG. 2, from the middle of the return header pipe 37, a small-diameter inlet pipe 39 for supplying water to each cooling tower unit 11 is branched as a branch pipe and passes through the side of the water collection tank 23. It extends. The end of the inlet pipe 39 is connected to the elbow 101a at the lower end of the inlet pipe 101 of FIG. 6 via a water amount adjusting valve 39a. For connection, a flange joint is usually used.

  Furthermore, in this embodiment, the return path header pipe 37 is comprised from the partial header pipe | tube 37a isolate | separated for every cooling tower unit, and the flange joint 37b which connects them. The end of each partial header tube 37a is located at a position slightly deviated from the plate 32, that is, at a portion protruding outward and a portion entering inside. Although it can also be provided directly under the plate 32, it is easier to perform the connecting operation if it is avoided directly below. The openings of the partial head tubes 37a at both ends in FIG. Then, a large-diameter circulating water inlet pipe 41 for connecting to the main pipe of the return pipe extends from the middle of the partial header pipe 37a at the right end of FIG. As shown in FIG. 3, the circulating water inlet pipe 41 extends obliquely downward from the partial header pipe 37 a, and further extends horizontally through the lower part of the water collection tank 23 by changing its direction in the horizontal direction. And it connects with the main pipe (symbol 16 of Drawing 1) of a return way pipe via a flexible joint.

  The partial header pipes 37a and 38a of each unit are fixed by a plate 32 with a U-shaped hanging bracket or the like, and the connecting portion is a flange joint. Therefore, if the suspension fitting and the flange joint are connected in a loosened state, and then the suspension fitting and the like are firmly fastened, the connection work of the partial header tubes 37a to 38a of each unit is easy.

  Similarly to the return header pipe 37, the outgoing header pipe 38 is separated by a part that protrudes somewhat outward from the plate 32 and a part that enters the inner side, and is connected by a partial header pipe 38a of each unit connected by a flange joint. It is configured. The partial header pipe 38 a of each unit and the side surface of the water collection tank 23 are connected by an outlet pipe 42. A water amount adjusting valve 42 a is interposed between the outlet pipe 42 and the water collection tank 23. Further, a circulating water outlet pipe 43 is branched laterally from the partial header pipe 38a at the right end of FIG. The circulating water outlet pipe 43 is connected to the main pipe (reference numeral 17 in FIG. 1) of the forward pipe through a flexible joint. Similarly to the return header pipe 37, both ends of the forward header pipe 38 are closed by the lid 40.

  In the water piping structure 13 configured as described above, the water used for the condenser and the like returned from the refrigerator of the building via the pump is directed from the main pipe 16 of the return pipe to the circulating water inlet pipe 41 in the direction of the arrow IN. , Branched into three inlet pipes 39 through the return header pipe 37, and sent to the upper part of the cooling tower unit 11 via the inlet pipe 101 extending in the vertical direction. As described above, it is cooled in the cooling tower unit 11 and accumulated in each water collecting tank 23. Then, the water gathers from the water collection tank 23 through the respective outlet pipes 42 to the forward header pipe 38, passes through the circulating water outlet pipe 43, is sent in the direction of the arrow OUT, and is sent to the main pipe 17 of the forward path pipe.

  As described above, the water pipe structure 13 exhibits substantially the same water circulation action as that of the conventional one. Further, as shown in FIG. 1, the three cooling tower units 11, the gantry 12 and the water circulation piping structure 13 are assembled together, brought into a building or the like, and installed on the foundation 14 to complete the construction work. Therefore, the construction period at the construction site is short. In addition, since the return header pipe 37 and the forward header pipe 38 are not fixed to the unit itself and are mounted apart from each other, adjustment after construction is easy. Further, since the return path header pipe 37 and the forward path header pipe 38 are disposed on both sides of the water collecting tank 23, the weight can be balanced. Therefore, the uneven load on the gantry 12 is reduced, and the design is facilitated.

  Further, since the main pipe 16 of the return pipe and the main pipe 17 of the outgoing pipe are separated from the large cooling tower 10, it is easy to approach each cooling tower unit 11. Therefore, maintenance is easy. Further, as can be seen from FIG. 2, the water piping structure 13 is integrated as a whole, but can be separated for each number of units, so that the number of units can be easily changed and added. In addition, since the flexible joint only needs to be provided at two locations of the circulating water inlet pipe 41 and the circulating water outlet pipe 43, the parts cost and the number of assembly steps can be greatly reduced.

  In the embodiment of FIG. 2, the circulating water inlet pipe 41 and the circulating water outlet pipe 43 are connected to the relatively end portions of the respective header pipes 37 and 38. However, it is preferable to connect to the center as much as possible. As a result, the left and right branch water flows or the combined water flow are balanced, and the water pressure is averaged.

  In the above embodiment, the circulating water inlet pipe 41 and the circulating water outlet pipe 43 are connected at right angles to the middle of the respective header pipes 37 and 38. However, like the water piping structure 44 shown in FIG. , 38 can be connected to the main pipes 16, 17 in the axial direction via flexible joints 45, 45. In this case, the circulating water inlet pipe 41 and the circulating water outlet pipe 43 are unnecessary. Furthermore, access to the large cooling tower 10 becomes easier. The other portions are substantially the same as those in FIG. 2, and therefore the same portions are denoted by the same reference numerals and description thereof is omitted.

  FIG. 5 shows a case where partition valves are interposed as flow rate adjusting valves 39a and 42a in the inlet pipe 39 and the outlet pipe 42 in the water pipe structure 44 of FIG.

  In the above embodiment, the cooling tower unit 11 constituting the large cooling tower 10 is exemplified as having three units, but two or four or more cooling tower units 11 are connected depending on the required cooling capacity. You can also

It is a schematic perspective view which shows one Embodiment of the large-sized cooling tower provided with the water piping structure of this invention. It is a top view which shows the water piping structure of the large sized cooling tower of FIG. It is a side view of the large-sized cooling tower of FIG. It is a top view which shows other embodiment of the water piping structure of this invention. It is a schematic side view which shows other embodiment of the water piping structure of this invention. It is a partially notched perspective view which shows an example of the conventionally well-known cooling tower used for the water piping structure of this invention. It is a partially notched top view which shows an example of the large sized cooling tower provided with the conventional water piping structure. It is a side view of the large-sized cooling tower of FIG. 9a and 9b are a plan view and a side view, respectively, showing another example of a large cooling tower having a conventional water piping structure. It is a side view which shows the further another example of the large sized cooling tower provided with the conventional water piping structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Large cooling tower 11 Cooling tower unit 12 Base 13 Water piping structure 14 Foundation 16 Main pipe of return pipe 17 Main pipe of outgoing pipe 21 Filling material unit 22 Panel 23 Catchment tank 24 Fan 26 Frame part 27 Leg (outside)
29 Small frame 30 Connecting member 31 Ladder-shaped member 32 Plate 33 Leg (inside)
34 Bracing 35 Reinforcing member 37 Return header pipe 37a Partial header pipe 37b Flange joint 38 Outbound header pipe 38a Partial header pipe 39 Inlet pipe 39a Water amount adjusting valve 40 Lid 41 Circulating water inlet pipe 42 Outlet pipe 42a Water quantity adjusting valve 43 Circulating water outlet pipe 44 Water piping structure 45 Flexible joint

Claims (6)

  A frame-shaped gantry, a cooling tower mounted on the gantry and provided with a water collecting tank in the center of the lower surface, a return pipe for feeding the return circulating water used for cooling the condenser and the like to the cooling tower, and A water piping structure of a large cooling tower having an outward piping for sending circulating water from a water collecting tank, wherein the return piping is arranged between the water collecting tank and a leg of the mounting frame, and the outward piping is connected to the water collecting tank and the mounting frame The water piping structure of a large cooling tower that is installed between the other leg. The stand supports a plurality of cooling towers arranged in a row,
The return line pipe is composed of a return path header pipe passing between the water collecting tanks of the plurality of cooling towers and the legs of the mount, and an inlet pipe branched from the return path header pipe to the entrance of each cooling tower,
2. The forward path pipe is composed of a forward header pipe that passes between a water collecting tank of a plurality of cooling towers and the other leg of the gantry, and an outlet pipe that connects the forward header pipe and each water collecting tank. The water piping structure described.   The water pipe structure according to claim 2, wherein the inlet pipe extends through a side of the water collection tank and is further turned upward to be connected to the cooling tower.   A circulating water outlet pipe extends laterally from the forward header pipe, passes through the lower part of the water collection tank, extends the circulating water inlet pipe in parallel with the circulating water outlet pipe, and further extends obliquely upward and laterally toward the pipeline header pipe. The water piping structure according to claim 2, wherein the water piping structure is connected to the water piping.   The water piping structure according to claim 2, wherein a main pipe of a return pipe is connected to an end of the return header pipe, and a main pipe of the forward pipe is connected to an end of the forward header pipe.   The water piping structure according to claim 2, wherein a gate valve is interposed in the inlet pipe and the outlet pipe.

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