Cooling-water circulation system

Abstract

The present cooling-water circulation system includes a cooling-tower-side circulation path for circulating cooling water between a cooling tower and a chiller machine, and a chiller-machine-side circulation path for circulating cooling water between the chiller machine 6 and a cooling target part. The cooling-tower-side circulation path and the chiller-machine-side circulation path are connected by a first connection pipe for introducing cooling water circulating in the chiller-machine-side circulation path into the cooling-tower-side circulation path.

1 . A cooling-water circulation system comprising:
 a cooling-tower-side circulation path for circulating cooling water between a cooling tower and a chiller machine; and   a chiller-machine-side circulation path for circulating cooling water between the chiller machine and a cooling target part,   wherein the cooling-tower-side circulation path and the chiller-machine-side circulation path are connected by a first connecting pipe for introducing cooling water circulating through the chiller-machine-side circulation path into the cooling-tower-side circulation path.   
     
     
         2 . The cooling-water circulation system according to  claim 1 , wherein
 the first connection pipe is provided at its one end with a differential pressure injector disposed in a pipe constituting the cooling-tower-side circulation path, and   the differential pressure injector is able to introduce cooling water flowing through the first connection pipe to cooling water flowing through the pipe, under a lower pressure than the cooling water flowing through the pipe.   
     
     
         3 . The cooling-water circulation system according to  claim 2 , wherein
 the differential pressure injector includes a small-diameter nozzle that is connected to one end of the first connection pipe and that is disposed such that its axis is along a flow direction of cooling water in the pipe, a large-diameter nozzle that is disposed such that its axis aligns with the axis of the small-diameter nozzle, and such that its discharge port is positioned downstream of a discharge port of the small-diameter nozzle in the flow direction of the cooling water in the pipe, and an intake port for taking the cooling water flowing through the pipe into the large-diameter nozzle to generate negative pressure in front of the discharge port of the small-diameter nozzle.   
     
     
         4 . The cooling-water circulation system according to  claim 3 , wherein
 the large-diameter nozzle is disposed so as to cover an outer peripheral surface of the small-diameter nozzle, and   the intake port is formed in a portion of the large-diameter nozzle, covering the outer peripheral surface of the small-diameter nozzle.   
     
     
         5 . The cooling-water circulation system according to  claim 4 , wherein
 a plurality of the intake ports is formed along a circumferential direction around the axis of the large-diameter nozzle, and   each of the intake ports is formed in an elliptical shape having a minor axis along the circumferential direction around the axis of the large-diameter nozzle.   
     
     
         6 . The cooling-water circulation system according to  claim 1 , wherein
 the chiller-machine-side circulation path is provided in its feed path with a water impurity separation device for removing impurities contained in cooling water circulating the chiller-machine-side circulation path,   the water impurity separation device includes a drain port for draining the cooling water together with separated impurities, and   the first connection pipe connects the drain port and a return path of the cooling-tower-side circulation path.   
     
     
         7 . The cooling-water circulation system according to  claim 1 , wherein
 the first connection pipe is provided with an electric valve that opens and closes the first connection pipe by opening and closing control of a control unit.   
     
     
         8 . The cooling-water circulation system according to  claim 1 , wherein
 the first connection pipe is provided with a constant flow valve of a washer rubber type.   
     
     
         9 . The cooling-water circulation system according to  claim 1 , wherein
 the cooling-tower-side circulation path and the chiller-machine-side circulation path are connected by a second connection pipe for introducing cooling water circulating through the cooling-tower-side circulation path into the chiller-machine-side circulation path.   
     
     
         10 . The cooling-water circulation system according to  claim 9 , wherein
 the second connection pipe connects a feed path of the cooling-tower-side circulation path and a tank provided in the chiller machine.   
     
     
         11 . The cooling-water circulation system according to  claim 10 , wherein
 the second connection pipe is provided at its one end with a float valve for opening and closing the second connection pipe in accordance with vertical movement of a water surface in the tank.