Device for controlling temperature of cooling water

Patent metadata

Field	Value
Publication number	US-10371469-B2
Application number	US-201715857055-A
Country	US
Kind code	B2
Filing date	Dec 28, 2017
Priority date	Dec 12, 2011
Publication date	Aug 6, 2019
Grant date	Aug 6, 2019

Abstract

A device for controlling the temperature of cooling water includes a three-way valve having a first inlet, a second inlet, and an outlet; a first feed pipe; a second feed pipe; and a return pipe for connecting between an outlet of the temperature-control target and an inlet of the cooling water supply unit. The device also includes a return-side bypass pipe for connecting between the return pipe and the second inlet of the three-way valve; a pump provided on the second feed pipe for circulating the cooling water between the three-way valve and the temperature-control target; and a temperature measuring unit for measuring a temperature of the cooling water flowing in the second feed pipe. In addition, the device includes a controller for controlling the three-way valve and the pump in accordance with a detection result of the temperature measuring unit.

First claim

What is claimed is:

1. A device for controlling a temperature of cooling water, the device comprising:
a heat exchanger for carrying out heat exchange between primary cooling water and secondary cooling water;
a tank for storing the secondary cooling water;
an injection pipe for connecting between the tank and a secondary cooling water supply unit;
a valve for controlling a flow rate of the secondary cooling water to be supplied into the tank from the secondary cooling water supply unit through the injection pipe;
a fluid level detection unit for detecting an amount of the secondary cooling water stored in the tank;
a first circulation pipe for connecting between the tank and a secondary cooling water inlet of the heat exchanger;
a second circulation pipe for connecting between a secondary cooling water outlet of the heat exchanger and a secondary cooling water inlet of a temperature-control target;
a third circulation pipe for connecting between the tank and a secondary cooling water outlet of the temperature-control target;
a pump for circulating the secondary cooling water stored in the tank through the heat exchanger, the temperature-control target, and the tank; and
a controller for opening the valve while operation of the pump is stopped, closing the valve and driving the pump in the case that detection results from the fluid level detection unit indicate an upper limit amount, and stopping the operation of the pump in the case that the detection results from the fluid level detection unit indicate a lower limit amount.

2. A device for controlling a temperature of cooling water as defined in claim 1 , further comprising:
a nitrogen introduction unit for introducing nitrogen gas into secondary water stored in the tank.

3. A device for controlling a temperature of cooling water as defined in claim 2 , wherein:
the nitrogen introducing unit comprises a bubble generating distal end portion constituted by a porous member;
nitrogen is introduced into the secondary cooling water within the tank through the pores of the bubble generating distal end portion by nitrogen being supplied to the nitrogen introducing unit, to generate nitrogen gas bubbles within the secondary cooling water within the tank, to decrease the concentration of dissolved oxygen in the secondary cooling water within the tank.

4. A device for controlling a temperature of cooling water as defined in claim 3 , wherein:
the tank comprises a plate provided between the bubble generating distal end portion and a connecting portion of the first circulating pipe connected to the tank, for preventing nitrogen gas bubbles, which are generated in the secondary cooling water within the tank through the bubble generating distal end portion, from moving toward the side of the connecting portion of the first circulating pipe.

5. A device for controlling a temperature of cooling water as defined in claim 1 , wherein:
the controller closes the valve and drives the pump, and stops driving of the pump when an elapsed time after driving of the pump is initiated, measured by a timer, exceeds a set amount of time which is set in advance, without the fluid level detection unit detecting a lower limit value.

6. A device for controlling a temperature of cooling water as defined in claim 1 , wherein:
the fluid level detecting unit is a cylindrical member that extends in the vertical direction and is fixed to the tank, and comprises the cylindrical member that enables secondary cooling water which is introduced into the tank to flow thereinto, an upper limit limit switch positioned at an upper portion of the cylindrical member, a lower limit switch positioned at a lower portion of the cylindrical member, and a float having buoyancy capable of moving in an upward direction and the downward direction in the vertical direction along the cylindrical member according to changes in the water level of secondary cooling water;
the upper limit switch sends a signal indicating that the secondary cooling water has reached an upper limit amount to the controller when it is detected that the float has moved upward to a predetermined upper limit height, and the lower limit switch sends a signal indicating that the secondary cooling water has reached a lower limit amount to the controller when it is detected that the float has moved downward to a predetermined lower limit height.

7. A device for controlling a temperature of cooling water as defined in claim 1 , wherein:
the tank is connected to a drain pipe in the vicinity of the upper end of the side surface of the tank.

8. A device for controlling a temperature of cooling water as defined in claim 1 , wherein:
the first circulating pipe is connected to the bottom surface of the tank.

9. A device for controlling a temperature of cooling water as defined in claim 1 , wherein:
a butterfly valve is provided with the third circulating pipe.

10. A device for controlling a temperature of cooling water as defined in claim 1 , wherein:
a filter is provided in the first circulating pipe.

11. A device for controlling a temperature of cooling water as defined in claim 1 , wherein:
the heat exchanger is a plate type heat exchanger.

Assignees

• Gigaphoton Inc

Inventors

• Kawasuji Yasufumi
• Komori Masazumi
• Wakabayashi Osamu

Classifications

• F28F27/00

  Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus (control arrangements in general G05) · CPC title

• G21K1/062

  Devices having a multilayer structure · CPC title

• F28F27/02 Primary

  for controlling the distribution of heat-exchange media between different channels ({static flow control means in header boxes F28F9/026}; arrangements of guide plates or guide vanes F28F9/22, F28F25/12) · CPC title

• F28F2250/08

  Fluid driving means, e.g. pumps, fans · CPC title

• H05G2/008

  involving an energy-carrying beam in the process of plasma generation · CPC title