JPH05259679A - Built-in type freezer cooler for electronic apparatus - Google Patents

Abstract

PURPOSE:To improve an efficiency of a freezing cooler and to improve reliability in a freezer cooler for cooling a heat generator such as a printed board, etc., mounted in an electronic apparatus. CONSTITUTION:The built-in type freezer cooler for an electronic apparatus comprises a Mollier diagram built-in ROM 5 having a Mollier diagram in which a variation in a state in the case of a temperature change of refrigerant 10 is formed. Control of a rotating speed of a compressor 30 for regulating an internal pressure of a freezer cooler system and control of switching of an expansion valve 35 for discharging the refrigerant 10 to a condenser 40 side are conducted by inputting temperature information from a temperature sensor 3 attached to a heat generator 1 to the ROM 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating / cooling device for cooling a heating element such as a printed board mounted on an electronic device, and in particular, it utilizes a Mollier diagram which illustrates the change of state with the temperature change of the refrigerant. The present invention relates to a built-in type refrigerating / cooling device for electronic equipment in which the efficiency and reliability of the refrigerating / cooling device are improved by controlling the rotation speed of the compressor and controlling the opening / closing of the expansion valve.

[0002]

2. Description of the Related Art FIG. 4 is a circuit diagram showing a basic structure of a conventional cooling device. As shown in FIG. 4, the conventional cooling device is
The refrigerant tank 80 containing the refrigerant 10 and the heat exchanger 70 for the refrigerant 10
Pump 75, a flow rate detection sensor 90 for detecting the flow rate of the refrigerant 10 supplied from the heat exchanger 70 to the refrigerant circulation unit 2 arranged in close contact with the heating element 1, and the flow rate detection sensor 90 The flow rate control device 95 controls the rotation speed of the pump 75 based on the information.

This cooling device is a cooling device of the type in which the cooling degree of the heating element 1 is controlled by controlling the amount of the refrigerant 10 supplied to the refrigerant circulating portion 2. In addition, starting from the refrigerant tank 80, the pump 75 → heat exchanger 70 → flow rate detection sensor 90 →
The refrigerant 10 that circulates through the circulation path of the refrigerant circulation unit 2 → the refrigerant tank 80 flows through a refrigerant distribution pipe (not shown) that connects these devices.

[0004]

In the conventional cooling device, as shown in FIG. 4, the flow rate of the refrigerant 10 supplied to the refrigerant circulating portion 2 arranged in close contact with the heating element 1 is controlled. Controls the degree of cooling of the heating element 1. However, this method, in which the cooling degree of the heating element 1 is controlled only by controlling the flow rate of the refrigerant 10, is used when the amount of heat generated on the heating element 1 side changes (electronic components mounted on the heating element 1, such as L
When the SI type is changed, etc.), the flow rate of the refrigerant 10 needs to be reset according to the amount of heat generated, which is more troublesome than expected. In addition, this cooling system
There is an inconvenience that the refrigerant 10 cannot be easily changed because the cooling efficiency also changes depending on the type.

Further, since the conventional cooling device is far away from the main body device in which the heating element 1 is housed, a hose, a signal cable, etc. are required between the frames, and therefore the reliability of the system is not sufficient.

According to the present invention, a refrigerating / cooling device is built in the main body device, and its control is performed by using a system in which a Mollier diagram is used to illustrate the change of the state accompanying the temperature change of the refrigerant. It is intended to realize a built-in type refrigerating / cooling device for electronic equipment in which the reliability of the cooling system is remarkably improved.

[0007]

As shown in FIG. 1, a built-in type refrigerating / cooling device for an electronic apparatus according to the present invention has a built-in Mollier diagram which illustrates a change in state with a change in temperature of a refrigerant 10. The rotation speed of the compressor 30 equipped with the Mollier diagram built-in ROM 5 and adjusting the internal pressure of the refrigerating and cooling system by inputting the temperature information from the temperature sensor 3 attached to the heating element 1 into the Mollier diagram built-in ROM 5 The control and open / close control of the expansion valve 35 that discharges the refrigerant 10 to the condenser 40 side are performed.

[0008]

In this built-in type refrigerating / cooling device, the temperature information from the temperature sensor 3 mounted on the heating element 1 is used for RO with a Mollier diagram.
Control of the refrigeration / cooling system by inputting into M5 (rotation speed control of the compressor 30 that adjusts the internal pressure of the refrigeration / cooling system and opening / closing control of the expansion valve 35 that discharges the refrigerant 10 to the condenser 40 side)
Because of the structure for performing the above, the device efficiency and reliability are extremely high.

[0009]

The present invention will be described in detail below with reference to the drawings of the embodiments. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining a control process of a cooling system based on a Mollier diagram, and FIG. 3 is a circuit diagram of a main part showing an application example of the present invention. However, the same parts as those in FIG. 4 are designated by the same reference numerals.

As shown in FIG. 1, the built-in type refrigerating / cooling device for an electronic apparatus according to the present invention has a Mollier diagram built-in ROM 5 having a built-in Mollier diagram which illustrates the change of state with the temperature change of the refrigerant 10. (Hereinafter referred to as ROM 5 with built-in M diagram) is installed in the control device 50, and temperature information from the temperature sensor 3 arranged on the heating element 1 is stored in the ROM with built-in Mollier diagram.
This is a new type refrigerating / cooling device that controls the rotation speed of the compressor 30 for adjusting the internal pressure of the refrigerating / cooling system by inputting it to 5 and the opening / closing control of the expansion valve 35 for discharging the refrigerant 10 to the condenser 40 side.

Since the Mollier diagram M is a diagram showing changes in the state of the refrigerant 10 due to the temperature change, if the Mollier diagram M is used to control the temperature of the refrigerant 10, freezing and cooling are performed. Only by controlling the internal pressure of the system, the maximum temperature and the minimum temperature of the refrigerant 10 can be set extremely accurately.

The control process of the refrigerating and cooling system based on the Mollier diagram will be described below with reference to FIG. In FIG. 2, M is a Mollier diagram consisting of a saturated liquid line part α (rising part) and a saturated vapor line part β (falling part),
a is the operation origin of the refrigerant 10 (in FIG. 2, the internal pressure of the refrigerating / cooling system at this time is set to 5 kg / Cm ² , and the refrigerant temperature is set to −10 ° C.), and b starts increasing the pressure of the refrigerant 10. Start point of increasing pressure (the internal pressure of the refrigerating / cooling system at this time is 5 kg / Cm ² , the refrigerant temperature is + 30 ° C.), and c is the expansion valve that opens the expansion valve 35 that discharges the refrigerant 10 to the condenser 40 side. Open point (internal pressure at this time is 8 kg / Cm ² , refrigerant temperature is + 50 ° C), d is refrigerant liquefaction point at which vaporized refrigerant 10 changes to liquefied state (internal pressure of the refrigerating / cooling system at this time is 8 kg / Cm ² , refrigerant temperature is about +25
℃), e is the decompression start point at which decompression starts with respect to the refrigerant 10 (the internal pressure at this time is 8 kg / Cm ² , and the refrigerant temperature is approximately −15).
C.), a->b->c->d-> e in order to return to the original a, thick solid lines with arrows indicate the transformation curves γ of the refrigerant. The horizontal axis (X axis) of this graph is the enthalpy [Kc
al / Kg], that is, the temperature of the refrigerant [° C.], and the vertical axis (Y axis) represents the internal absolute pressure of the cooling system [Kg / Cm ² ].

.. When the detected temperature value of the heating element 1 detected by the temperature sensor 3 is input to the ROM 5 with built-in M (see FIG. 1) housed in the control device 50, this temperature information is converted into the refrigerant temperature, It is plotted on the horizontal axis (X axis) of the Mollier diagram M, which is stored as firmware in the figure built-in ROM 5. If the converted value of the detected temperature value at this time is equal to or lower than the temperature (+ 30 ° C.) at the pressure increase starting point b, the refrigerating / cooling system does not operate. This is because the heating element 1 may be excessively cooled if the refrigerating and cooling system is operated when the refrigerant temperature is + 30 ° C. or lower. The internal pressure of the refrigerating and cooling system at this time was maintained at 5 kg / Cm ² .

.. When the temperature of the heating element 1 rises and the temperature of the refrigerant 10 reaches the pressure increasing start point b (the temperature of the refrigerant 10 at this time is 30 ° C.) where it crosses the saturated vapor line β of the Mollier diagram M, the rotation speed of the compressor 30 To raise the internal pressure of the refrigeration system.

.. When the internal pressure of the freezing / cooling system rises, the temperature of the refrigerant 10 also gradually rises accordingly. ． When the temperature of the refrigerant 10 rises and reaches the maximum allowable temperature of the refrigerant 10 of 50 ° C. (this temperature varies depending on the type of the refrigerant 10), the rotation speed of the compressor 30 is made constant. The internal pressure of the refrigerating / cooling system at this time is 8 kg / Cm ² .

.. Here, the expansion valve 35 is opened and the refrigerant 10 in the vaporized state is discharged to the condenser 40 side. Condenser 40
The temperature of the refrigerant 10 fed into the tank gradually decreases, and the refrigerant 10 is liquefied when it crosses the saturated vapor line β.

.. The refrigerant 10 further reaches the depressurization start point e which intersects the saturated liquid line α of the Mollier diagram M while further lowering its temperature. ． When the temperature of the refrigerant 10 drops to the temperature of the decompression starting point e, the rotation speed of the compressor 30 is lowered to lower the internal pressure of the refrigerating / cooling system. At the time when the internal pressure of the refrigerating / cooling system is lowered and returned to the original pressure (5 kg / Cm ² ), the temperature of the refrigerant 10 is also returned to the original temperature of the operation origin a (−10 ° C.).

As is clear from the above description, the use of this Mollier diagram M makes it possible to control the temperature cycle (refrigerant transformation curve γ) of the refrigerant 10 particularly accurately. Is extremely efficient and reliable. The controller 50 controls the operations of the compressor 30 and the expansion valve 35 according to the transformation curve γ of the refrigerant.

Next, one application example of the present invention will be described with reference to FIG. This application example is equipped with multiple Mollier diagram built-in ROMs 5 _-1 , 5 _-2 ---- 5 _-n , each of which contains Mollier diagram corresponding to multiple types of refrigerants 10, and each of these Mollier diagrams. ROM selection switches 7 _-1 , 7 _-2 ---- 7 _-n for selectively connecting the built-in ROMs 5 _-1 , 5 _-2 ---- 5 _-n and the temperature sensor 5 to the ROM switching section 8 Characterized by being equipped.

The present invention has been made to solve the problem that the Mollier diagram M for only a specific refrigerant 10 cannot cope with the change of the kind of the refrigerant 10. This refrigerating / cooling device is provided with a plurality of Mollier diagram built-in ROMs 5 _-1 , 5 _-2 --- -5 _-n each having a built-in Mollier diagram corresponding to a plurality of types of refrigerants 10 in the controller 50A. Therefore, even if the type of the refrigerant 10 changes, RO
ROM 5 _-1 , 5 with built-in Mollier diagram corresponding to the relevant refrigerant 10 just by operating M selection switch 7 _-1 , 7 _-2 ---- 7 _-n
-2 ---- 5 _-n can be easily selected, which greatly improves the versatility of the refrigeration system.

This built-in type refrigerating / cooling apparatus controls the rotation speed of the compressor 30 and the expansion valve 35 of the refrigerating / cooling system based on the Mollier diagram M which illustrates the change of the state of the refrigerant 10 with the temperature change of the refrigerant 10. The operation of the refrigeration / cooling system is extremely rational and highly efficient because it employs a system that controls opening and closing.

[0022]

As is apparent from the above description, since the refrigerating / cooling device according to the present invention is a cooling device built in the main body device, an in-frame hose, a signal cable, etc. are not required, and the control method is simple. In addition, the operation of the refrigerating and cooling system is controlled on the basis of the Mollier diagram M in which the change of the state of the refrigerant 10 due to the temperature change of the refrigerant 10 is controlled, so that the reliability of the apparatus is extremely high.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a diagram for explaining a control process of a cooling system based on a Mollier diagram.

FIG. 3 is a circuit diagram of a main part showing an application example of the present invention.

FIG. 4 is a circuit diagram showing a basic configuration of a conventional cooling device.

[Explanation of symbols]

1 Heating element 2 Refrigerant circulation part 3 Temperature sensor 5, 5 _-1 , 5 _-2 , 5 _-n M figure built-in ROM 7 _-1 , 7 _-2 , 7 _-n ROM selection switch 8 ROM switching part 10 Refrigerant 30 Compressor 35 Expansion valve 40 Condenser 50, 50A Control device 70 Heat exchanger 75 Pump 80 Refrigerant tank 90 Flow rate detection sensor 95 Flow rate control device M Mollier diagram α Saturated liquid line part β Saturated vapor line part γ Refrigerant transformation curve a Operating origin b Pressure increase starting point c Expansion valve opening point d Refrigerant liquefaction point e Decompression starting point

Claims (2)

[Claims] 1. A refrigerating / cooling device for cooling a heating element (1) such as a printed board mounted on an electronic device, wherein a Mollier diagram illustrating a change in state with a change in temperature of a refrigerant (10) is shown. The built-in ROM (5) with built-in Mollier diagram is provided, and the temperature information from the temperature sensor (3) attached to the heating element (1) is input to the ROM (5) with built-in Mollier diagram. A compressor that adjusts the internal pressure of the cooling system (3
(1) A built-in type refrigerating / cooling device for electronic equipment, which controls the rotation speed of (0) and the opening / closing control of an expansion valve (35) that discharges the refrigerant (10) to the condenser (40) side. 2. A plurality of Mollier diagram built-in ROMs each containing a Mollier diagram corresponding to a plurality of types of refrigerants (10).
_{(5 -1), (5 -2} ) ---- (5 -n) as well as equipped with, respective Mollier diagram Internal _{ROM (5 -1), (5} -2) ---- (5 - _n ) and the temperature sensor (3) are selectively connected, and ROM selection switches (7 _-1 ), (7 _-2 ) ---- (7 _-n ) are provided. Item 1. A built-in type refrigeration / cooling device for electronic equipment according to Item 1.