JP2806663B2 - Liquid refrigerant circulation control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid refrigerant circulation control device, and more particularly to a method of controlling a liquid refrigerant circulation amount in a submerged cooling system.

[0002]

2. Description of the Related Art Conventionally, in this type of liquid refrigerant circulation amount control method, as shown in FIG. It is designed to be a flow rate.

An electronic component (not shown) is built in the electronic component storage case 5, and the electronic component is immersed and cooled by a predetermined flow rate of liquid refrigerant supplied through a constant flow valve 3. It is cooled efficiently by nucleate boiling.

The liquid refrigerant whose temperature has been raised by the electronic components in the electronic component storage case 5 is cooled to a predetermined temperature by the heat exchanger 7 and is stored in the buffer tank 8. The buffer tank 8 is for absorbing a change in volume due to the temperature of the liquid refrigerant, and the like. Here, the above components are connected in series by a pipe 9, and a liquid refrigerant circulates in the flow path in the direction of arrow A.

[0005] In such a conventional liquid refrigerant circulation amount control method, when a desired flow rate is supplied, the supply pump 1 has a discharge pressure that overcomes pressure loss due to flow path resistance from the outlet of the constant flow valve 3 to the buffer tank 8. It is necessary to send out liquid refrigerant from. Therefore, the pressure applied to the liquid refrigerant also increases, and the boiling point of the liquid refrigerant in the electronic component storage case 5 increases, so that there is a problem that cooling by nucleate boiling is not promoted. Further, since the pressure applied to the flow channel is also increased, there is a problem that the flow channel structure must have a structure with high pressure resistance.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to eliminate the above-mentioned problems of the prior art. It is possible to enhance nucleate boiling cooling to improve the cooling efficiency and to improve the pressure resistance of the flow path structure. It is an object of the present invention to provide a liquid refrigerant circulation control device that can be kept low.

[0007]

A liquid refrigerant circulation control device according to the present invention comprises:
A liquid refrigerant circulation control device of a cooling device for accumulating a liquid refrigerant in a storage case and cooling electronic components in the storage case, wherein the discharge pump discharges the liquid refrigerant in the storage case, and the storage case. The liquid cooling supplied into the
A constant flow valve that makes the flow rate of the medium constant, and a detection unit that detects the pressure of the liquid refrigerant supplied into the storage case,
Control means for controlling the pressure in the storage case by the discharge pump according to the detection result of the detection means.

Another liquid refrigerant circulation control device according to the present invention is a liquid refrigerant circulation control device of a cooling device for accumulating liquid refrigerant in a storage case and cooling electronic components in the storage case. A discharge pump for discharging the liquid refrigerant in the container, and the liquid supplied to the storage case.
A constant flow valve for keeping the flow rate of the body refrigerant constant; a detecting means for detecting the pressure of the liquid refrigerant discharged from the storage case; and the discharge pump in the storage case according to a detection result of the detection means . And control means for controlling the pressure .

[0009]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, a liquid refrigerant sent from a supply pump 1 is supplied to an electronic component storage case 5 at a desired flow rate by a constant flow valve 3. At this time, the pressure of the liquid refrigerant circulating in the direction of arrow A is measured by the pressure gauge 4, and the measured value is output to the pump capacity control unit 6.

The pump capacity control unit 6 controls the recovery pump 2 in accordance with the measurement value from the pressure gauge 4, and recovers the liquid refrigerant in the electronic component storage case 5 by the recovery pump 2. The temperature rises by the electronic components (not shown) in the electronic component storage case 5, and the liquid refrigerant recovered by the recovery pump 2 is cooled to a predetermined temperature by the heat exchanger 7 and stored in the buffer tank 8. The buffer tank 8 is for absorbing a change in volume due to the temperature of the liquid refrigerant, and the like. still,
Each of the above components is connected in series by a pipe 9.

The discharge amount of the liquid refrigerant from the supply pump 1 to the electronic component storage case 5 is fixedly determined by the constant flow valve 3. The pressure of the liquid refrigerant discharged from the constant flow valve 3 is measured by a pressure gauge 4 provided on the refrigerant inlet side of the electronic component storage case 5, and the measured value is notified to the pump capacity control unit 6.

The pump capacity control section 6 controls the amount of liquid refrigerant recovered by the recovery pump 2 so that the measured value notified from the pressure gauge 4 becomes a predetermined value. That is,
Until the pressure gauge 4 measures a predetermined pressure, the pump capacity control unit 6 controls the recovery pump 2 by linear control using an inverter or the like to vary the recovery amount of the liquid refrigerant. Here, the predetermined pressure measured by the pressure gauge 4 is set to a value such that the pressure in the electronic component storage case 5 becomes substantially atmospheric pressure. You
That is, in this embodiment, the input side of the electronic component storage case 5 is
Since the pressure gauge 4 is provided, the value indicated by the pressure gauge 4 is almost
By controlling the pressure to be approximately atmospheric pressure,
The pressure in the source 5 can be reduced to the atmospheric pressure or less, and nucleate boiling
Cooling can be promoted.

FIG. 2 is a block diagram showing another embodiment of the present invention. In the drawing, in another embodiment of the present invention, the pressure gauge 10 is provided on the refrigerant outlet side of the electronic component storage case 5 and the recovery pump 2 is controlled by the pump capacity control unit 11 according to the measured value of the pressure gauge 10. Except for this, the configuration is the same as that of the embodiment of the present invention shown in FIG. 1, and the same components are denoted by the same reference numerals. The operation of these same components is the same as in the embodiment of the present invention.

The pressure gauge 10 measures the pressure of the liquid refrigerant discharged from the refrigerant outlet of the electronic component storage case 5, and notifies the pump capacity control unit 11 of the measured value. The pump capacity control unit 11 controls the amount of liquid refrigerant recovered from the inside of the electronic component storage case 5 by the recovery pump 2 so that the measured value from the pressure gauge 10 becomes a predetermined value set in advance.

That is, the pump capacity control unit 11 controls the recovery pump 2 until the predetermined pressure is measured by the pressure gauge 10, and varies the recovery amount of the liquid refrigerant. Here, the predetermined pressure measured by the pressure gauge 10 is set to a value such that the pressure in the electronic component storage case 5 becomes substantially atmospheric pressure.

With the above configuration, the liquid refrigerant is controlled as follows. The coolant supplied to the electronic component storage case 5 by the supply pump 1 is recovered by the recovery pump 2 after cooling the electronic components in the electronic component storage case 5, and returned to the buffer tank 8 through the heat exchanger 7.

At this time, a pressure loss for flowing the refrigerant is generated in the pipes to the heat exchanger 7 and the buffer tank 8, so that a power corresponding to the pressure loss is supplied to the recovery pump 2. The power of the recovery pump 2 is supplied such that the power value output from the pump capacity control unit 6 is controlled by, for example, an inverter system so that the pressure of the pressure gauge 4 becomes a constant value.

Therefore, the magnitude of the pressure loss up to the heat exchanger 7 and the buffer tank 8 is not applied to the electronic component storage case 5, so that the pressure in the electronic component storage case 5 can be reduced.

Further, even if the supply pump 1 and the constant flow valve 3 have variations in performance and the flow rate varies,
Since the power of the recovery pump 2 is controlled such that the value of the pressure gauge 4 is maintained at a constant value, the pressure in the electronic component storage case 5 can be stabilized and maintained at a low level.

As described above, the pressure gauges 4 and 10 are provided on the refrigerant inlet side or the outlet side of the electronic component storage case 5, and the amount of the liquid refrigerant recovered by the recovery pump 2 is adjusted according to the values of the pressure gauges 4 and 10. The pressure in the electronic component storage case 5 can be set to substantially the atmospheric pressure by controlling the capacity control units 6 and 11. Therefore, nucleate boiling cooling in the electronic component storage case 5 can be promoted, and the cooling capacity can be improved.

Also, since the pressure in the electronic component storage case 5 can be stabilized and maintained at a low pressure, the pressure resistance of the electronic component storage case 5 as a flow path constituting member can be suppressed low.

[0023]

As described above, according to the present invention, the pressure of the liquid refrigerant supplied to the storage case or the pressure of the liquid refrigerant discharged from the storage case is detected, and the discharge pump is operated in accordance with the detection result. Storage case from storage case
By controlling the internal pressure , the nucleate boiling cooling can be promoted to improve the cooling efficiency, and the pressure resistance of the flow path structure can be suppressed to a low level.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a configuration diagram showing another embodiment of the present invention.

FIG. 3 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Supply pump 2 Recovery pump 3 Constant flow valve 4, 10 Pressure gauge 5 Electronic component storage case 6, 11 Pump capacity control part 7 Heat exchanger 8 Buffer tank

Claims (1)

(57) [Claims] 1. A liquid refrigerant circulation control device of a cooling device for accumulating a liquid refrigerant in a storage case to cool electronic components in the storage case, wherein the discharge pump discharges the liquid refrigerant in the storage case. A constant flow valve that keeps the flow rate of the liquid refrigerant supplied into the storage case constant; a detection unit that detects the pressure of the liquid refrigerant supplied into the storage case; a detection result of the detection unit Control means for controlling the pressure in the storage case to be equal to the atmospheric pressure in accordance with the condition (1).