JPH04329698A - Cooling unit - Google Patents

Abstract

PURPOSE:To stabilize water temperature control by making the capacity of heat-exchange in a heat-exchanger variable. CONSTITUTION:When the secondary cooling water within the cooling pipe 26 in a cooling unit 31 is cooled by the primary cooling water from the primary cooling the supply unit and fed to a cooled body 20 in an electronic device 32 by a pump 4, the cooling pipe 26 will be long, with the first and second cooling pipe 26a and 26b continued if the valve (A) 21 is open and the valve (B) 22 is closed, and it will be short, with only the second cooling pipe 26b effective if the valve (A) 21 is closed and the valve (B) 22 is open. When the heat capacity of the electronic device is low heat production and the flow rate required by the electronic device is low flow rate, it is possible to make the heat-exchange rate low by making the heat-conduction area within the heat- exchanger small, and to perform anti-condensation measurement by making the temperature drop of the electronic device small.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device, and more particularly to a cooling device for circulating a liquid refrigerant to an object to be cooled in an electronic device such as an electronic computer.

0002

2. Description of the Related Art Conventionally, a cooling apparatus for removing heat from an electronic device, such as an electronic computer, by circulating and supplying liquid refrigerant from the object to be cooled has a configuration shown in FIG.

In FIG. 2, 31 is a cooling device, and 32 is an electronic device. Reference numeral 3 denotes a tank for storing liquid refrigerant and absorbing changes in volume due to temperature of the refrigerant, and the secondary cold water in this tank 3 is sent to the object to be cooled 20 of the electronic device 32 by a pump 4 .

Reference numeral 5 denotes a secondary cold water outlet downstream of the pump 4, and 6 denotes a secondary cold water receiving inlet for returning secondary cold water from the object 20 to be cooled. 1 is a heat exchanger that exchanges heat with this returned secondary cold water, and this heat exchanger 1 is equipped with a cooling pipe 25 through which the secondary cold water flows, and is supplied from the primary cold water supply device 33 through the primary cold water inlet 19. The primary cold water sent out cools the secondary cold water in the cooling pipe 25.

Reference numeral 2 denotes a control section which adjusts the opening degree of the three-way valve 8 via a control line 17 and a modutrol motor 9 to adjust the flow rate of primary cold water supplied to the heat exchanger 1. The primary chilled water regulated by the three-way valve 8 and bypassed passes through the primary chilled water return port 18 and returns to the primary chilled water device 33.

The control unit 2 of the cooling device 31 constantly monitors the temperature sensors 10, 11, and 12 provided at required parts via signal lines 13, 14, and 15.

[0007] Furthermore, the control section 2 operates the pump 4 via an operation command line 16.

Furthermore, the control unit 2 controls the water temperature so that the water temperature measured by the temperature sensor 10 is a little higher than the air temperature measured by the temperature sensor 11 (specified value).

[0009]

[Problems to be Solved by the Invention] However, in the above-mentioned cooling device, if the configuration of the electronic device has a low calorific value and the electronic device requires only a low flow rate, the heat exchanger of the cooling device has a There was a problem in that water temperature control was unstable because the exchange capacity was too large.

[0010] If the water temperature control is unstable in this way, it will have an adverse effect on the reliability of the object to be cooled in the electronic device, and may also cause dew condensation.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a cooling device in which the heat exchange capacity of a heat exchanger is made variable to stabilize water temperature control.

0012

[Means for Solving the Problems] In order to achieve the above object, the cooling device of the present invention includes a secondary cooling water supply mechanism that circulates and supplies secondary cooling water to an electronic device having a heating element, and A cooling device having a cooling pipe through which cooling water flows, and a heat exchange mechanism for exchanging heat of secondary cooling water in the cooling pipe with primary cooling water, the cooling device having a temperature of the heating element, an internal temperature of the electronic device, etc. A temperature sensor is provided to detect the temperature and the temperature of the secondary cooling water, and a variable pipe is provided in the cooling pipe to which a valve is attached that changes the path length of the cooling pipe, and the valve of the variable pipe is installed in accordance with the amount of heat generated by the heating element. It has a structure that allows it to be opened and closed.

[0013]

[Operation] According to the cooling device constructed as described above, when the opening and closing of the valve of the variable tube is controlled by the control section in accordance with the amount of heat generated by the heating element of the electronic device, the path length of the cooling tube is changed. Therefore, when the heat generation value of the cooled body of the electronic device is low and the flow rate required by the cooled body of the electronic computer is low, the heat transfer area in the heat exchanger becomes small and the heat Exchange performance is set small.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 32 is an electronic device, 31 is a cooling device, and 33 is a primary cold water supply device.

The cooling device 31 has a heat exchanger 1 for cooling secondary cold water. This heat exchanger 1 has a cooling pipe 26 through which secondary cold water flows, and this cooling pipe 26 has U-shaped first and second cooling pipes 26a and 26b, and has a primary cold water supply device. The secondary cold water in the cooling pipe 26 is cooled by the primary cold water supplied from 33 through the primary cold water intake port 19 . The outlet side of the second cooling pipe 26b is the secondary cold water pipe 7
It reaches tank 3 via.

Further, 27 is a variable pipe, which includes a valve (A) 21 and a valve (B) 2 that change the path length of the cooling pipe 26.
It is equipped with 2. That is, the variable pipe 27 has a valve (A) 21 interposed between one inlet of the two-way pipe 28 connected to the secondary cold water intake port 6 and the inlet of the first cooling pipe 26a,
A valve (B) 22 is interposed between the other inlet of the two-way pipe 28 and a pipe line 29 leading to the outlet of the first cooling pipe 26a and the inlet of the second cooling pipe 26b.

Therefore, when the valve (A) 21 is open and the valve (B) 22 is closed, the first and second cooling pipes 26a and 26b of the cooling pipe 26 are continuously long.
When valve (A) 21 is closed and valve (B) 22 is open,
Only the second cooling pipe 26b becomes effective and short.

3 is a tank for storing liquid refrigerant and absorbing changes in volume due to temperature of the refrigerant;
The secondary cold water inside is sent to the cooled body 20 of the electronic device 32 by the pump 4. 5 is a secondary cold water outlet downstream of pump 4, 6
is a secondary cold water receiving port for secondary cold water returning from the object 20 to be cooled.

Reference numeral 2 denotes a control section which adjusts the opening degree of the three-way valve 8 via a control line 17 and a modutrol motor 9 to adjust the flow rate of primary cold water supplied to the heat exchanger 1. The primary chilled water regulated by the three-way valve 8 and bypassed passes through the primary chilled water return port 18 and returns to the primary chilled water device 33.

The control unit 2 of the cooling device 31 constantly monitors the temperature sensor 10, temperature sensor 11, and temperature sensor 12 provided at required parts via the signal line 13, the signal line 14, and the signal line 15.

Furthermore, the control section 2 operates the pump 4 via an operation command line 16.

Therefore, according to the cooling device according to this embodiment, in the case of normal operation, before operating the cooling device 31, the valve (B) 22 is closed, the valve (A) 21 is opened, and the cooling device 31 is closed. , electronic device 32, primary cold water supply device 33
Turn on the power.

In this case, the secondary cold water in the tank 3 enters the pump 4, and the discharge of the pump 4 cools the cooled object 20 of the electronic device 32 through the secondary cold water outlet 5. Return to the secondary cold water inlet 6 of the cooling device 31 and open the valve (A
) 21, heat exchanges with the primary cold water in the heat exchanger 1, and returns to the tank 3 via the secondary cold water pipe 7. Then, the operation of the pump 4 is stopped via the operation command line 16.

The primary cold water that has undergone heat exchange in the primary cold water supply device 33 enters through the primary cold water inlet 19 of the cooling device 31, and its flow rate is adjusted by the three-way valve 8 whose opening degree is adjusted by the Modutrol motor 9. , an appropriate amount flows into the heat exchanger 1. The bypassed primary cold water or the primary cold water that has passed through the heat exchanger 1 passes through the three-way valve 8 and is returned to the primary cold water supply device 32 from the primary cold water return port 18 .

Furthermore, the temperature of the secondary cold water sent out from the secondary cold water outlet 5 is constantly monitored by a temperature sensor (A) 10, and the temperature is adjusted to a slightly higher specified value by a temperature sensor (B) 11. The heat exchanger 1 exchanges heat as follows.

The control unit 2 also monitors the temperature of the object to be cooled 20 using the temperature sensor (C) 12. The control unit 2 issues a command to the modutrol motor 9 to adjust the amount of heat exchange of the secondary cold water, and adjusts the opening degree of the three-way valve 8 to bypass the amount of primary cold water and control the water temperature. There is.

[0028] If the configuration of electronic device 32 has a low calorific value and the electronic device 32 requires only a low flow rate,
When the cooling device 31 is stopped, the valve (A) 21
, and open valve (B) 22.

After that, when the cooling device 31 is operated, the flow of secondary cold water enters from the secondary cold water inlet 6 and passes through the valve (
B) Passes through 22, undergoes heat exchange in heat exchanger 1, and enters tank 3.

When the secondary cold water is supplied by opening the aforementioned valve (B) 22 and closing the valve (A) 21, the heat transfer area within the heat exchanger becomes smaller, making it possible to reduce the heat exchange performance.

[0031]

[Effects of the Invention] As explained above, according to the cooling device of the present invention, when the electronic device has a low calorific value and the electronic device requires a low flow rate, the cooling device can be operated. Previously, by operating the valve, it is possible to reduce the heat transfer area in the heat exchanger and reduce the heat exchange performance, thereby reducing the temperature drop of integrated circuit elements in electronic devices. This has the effect of making it possible to take measures against condensation.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a cooling device according to an embodiment of the present invention.

FIG. 2 is a diagram showing the configuration of a conventional cooling device.

[Explanation of symbols]

1 Heat exchanger 2 Control section 3 Tank 4 Pump 5 Secondary cold water outlet 6 Secondary cold water inlet 7 Secondary cold water piping 8 Three-way valve 9 Modutrol motor 10 Temperature sensor (A) 11 Temperature sensor (B) 12 Temperature sensor (C) 13-15 Signal line 16 Operation command line 17 Control line 18 Primary cold water return port 19 Primary cold water inlet 20 Cooled object 21 Valve (A) 22 Valve (B) 25, 26 Cooling pipe 26a First cooling pipe 26b Second cooling pipe 27 Variable tube 31 Cooling device 32 Electronic equipment 33 Primary cold water supply device

Claims (1)

[Claims] 1. A secondary cooling water supply mechanism that circulates secondary cooling water to an electronic device having a heating element, and a cooling pipe through which the supplied secondary cooling water flows, and the cooling pipe is heated by the primary cooling water. A cooling device having a heat exchange mechanism for exchanging heat with secondary cooling water, the cooling device having a temperature sensor for detecting the temperature of the heating element, the internal temperature of the electronic device, and the temperature of the secondary cooling water, respectively, A cooling device characterized in that the cooling pipe is provided with a variable pipe equipped with a valve that changes the path length of the cooling pipe, and the valve of the variable pipe can be opened and closed according to the amount of heat generated by the heating element.