JPH051866A - Refrigerator - Google Patents

Abstract

PURPOSE:To carry out high accuracy temperature control of cooling liquid constantly by improving operation control-related structure. CONSTITUTION:A refrigerant drain pot 11 or a container which stores refrigerant 1a and a capillary tube 12 or a resistant means against the refrigerant which flows in a pressure pipeline 10 connected with the refrigerant drain pot 11 in series are installed to the pressure pipeline 10 which communicates the pressure of the refrigerant 1a on the suction side of a compressor 1 with the pressure of the refrigerant 1a of a manipulation section of a refrigerant bypass valve 9. Since the refrigerant valve 9 can be opened and closed slowly as a result, it is possible to prevent the generation of hunting motion between the refrigerant valve 9 and a vaporization pressure control valve 5 at a point around a setting pressure on the suction side of a compressor 1 for which the refrigerant valve 9 starts its opening motion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object to be cooled such as a water cooling type cooling device for cooling semiconductor elements using water as a cooling medium, a cooling device for cooling cutting oil for machine tools or a blood refrigerator. The present invention relates to a refrigerator used in a device that requires precise temperature control, and particularly relates to improvement of a configuration related to its operation control.

[0002]

2. Description of the Related Art In a semiconductor device cooling device, since the operating temperature of the semiconductor device is strictly regulated, the precise temperature of the cooling water or the cooling oil, which is the cooling liquid, is adjusted according to the fluctuation of the heat generation amount of the semiconductor device. Control is required. FIG. 2 is a refrigerant circuit diagram of a conventional refrigerator used in such a cooling device. In FIG. 2, reference numeral 1 denotes a compressor for sucking the refrigerant 1a from the suction port, compressing it under pressure, and discharging it from the discharge port.
Reference numeral 2 is a condenser for cooling the refrigerant 1a which is compressed by the compressor 1 and has a high temperature. Reference numeral 3 is an expansion valve for expanding the refrigerant 1a which is compressed by the compressor 1 and has a high pressure. An evaporator that cools the cooling liquid that is the object to be cooled by 4a is a pipe line through which the cooling liquid flows, and 5 is a temperature inserted between the evaporator 4 and the suction port of the compressor 1. Controllable evaporation pressure adjusting valve, 6 is a temperature sensor arranged in the cooling liquid pipe 4a for detecting the temperature of the cooling liquid, and 7 is an opening of the temperature controlling evaporation pressure adjusting valve 5 using the output of the temperature sensor 6 as an input signal. Temperature controller that outputs a temperature signal, 8 is a refrigerant bypass pipe that connects the discharge port of the compressor 1 and the inlet side of the evaporator 4,
Reference numeral 9 is a refrigerant bypass valve that is inserted into the refrigerant bypass pipe 8 and starts a valve opening operation when the refrigerant pressure on the suction side of the compressor 1 reaches a preset set pressure. 10 is a suction port side of the compressor 1. Is a pressure guiding pipe that connects the refrigerant bypass valve 8 and the operation part of the refrigerant bypass valve 8 to communicate the refrigerant pressure of the operation part of the refrigerant bypass valve 8 with the refrigerant pressure of the suction side of the compressor 1.

In the above structure, first, the temperature controller 7
The temperature sensor 6 detects the temperature of the cooling liquid in the evaporator 4 by the control system of the temperature control type evaporation pressure adjusting valve 5 and adjusts the valve opening degree of the evaporation pressure adjusting valve 5 to control the cooling liquid. Temperature control is performed. That is, when the heat load decreases due to the decrease in the loss generated by the semiconductor element and the temperature of the cooling liquid starts to decrease, the temperature sensor 6 detects this temperature change and changes the valve opening degree of the evaporation pressure adjusting valve 5. Throttle, reduce the refrigeration capacity of the refrigerator to balance with the heat load. The pressure on the suction side of the compressor 1 decreases as the refrigerating capacity decreases. On the other hand, the refrigerant bypass valve 9 is normally closed, and the suction side pressure of the compressor 1 is used as an input signal, and this pressure is set to a predetermined set pressure slightly higher than the operating pressure of a low pressure switch (not shown). It is set to open when the temperature drops below the value. Therefore, when the suction side pressure decreases to this set pressure, the refrigerant bypass valve 9 starts the opening operation, and a part of the high temperature refrigerant gas discharged from the compressor 1 is bypassed directly to the evaporator 4 through the refrigerant bypass pipe 8. Then, a simulated load is applied to the evaporator 4, and the refrigerating capacity and the refrigerating load are balanced in this state. As a result, a wide range of capacity can be controlled, and the temperature of the cooling liquid can be precisely controlled regardless of the heat load.

[0004]

In the refrigerating machine according to the above-mentioned prior art, a highly accurate cooling liquid temperature can be obtained when the refrigerant bypass valve is operated with the valve closed, however, Since the operation part of the refrigerant bypass valve is connected to the suction side of the compressor by the pressure guiding pipe, the refrigerant bypass valve operates sensitively according to the suction side pressure, and the above-mentioned refrigerant bypass valve starts the opening operation. Near the set pressure on the suction side of the compressor, open the refrigerant bypass valve → increase the temperature of the cooling liquid → open the valve opening of the temperature-controlled evaporative pressure adjusting valve → increase the pressure on the suction side of the compressor → close the refrigerant bypass valve → Cooling liquid temperature drop → Evaporation pressure adjustment valve opening is reduced → Compressor suction side pressure drop, even though there is no significant load fluctuation, refrigerant bypass valve and evaporation pressure adjustment valve alternate By performing the operation, there is a problem that can not be obtained a highly accurate cooling liquid temperature in this condition.

The present invention has been made in view of the above-mentioned problems of the prior art, and its object is to always perform highly accurate temperature control of the cooling liquid temperature by improving the configuration related to the operation control. It is to provide a refrigerator capable of performing.

[0006]

In the present invention, the above-mentioned objects are as follows: 1) an evaporator for generating cold heat by evaporating a refrigerant;
A compressor that sucks in a low-pressure refrigerant that has been evaporated by this evaporator from a suction port, pressurizes and compresses it, and discharges it from a discharge port; and a condenser that cools the high-temperature refrigerant compressed by this compressor, An expansion valve connected downstream of the condenser for expanding the high-pressure refrigerant compressed by the compressor, and a temperature control type evaporation pressure adjusting valve inserted between the evaporator and the suction port of the compressor. , A refrigerant bypass pipe connecting the discharge port of the compressor and the inlet side of the evaporator, and when the refrigerant pressure on the suction side of the compressor inserted into the refrigerant bypass pipe reaches a preset set pressure A refrigerant bypass valve that operates to open the valve, the compressor suction port side and the operation section of the refrigerant bypass valve are connected so that the refrigerant pressure of the operation section of the refrigerant bypass valve and the refrigerant pressure of the suction side of the compressor communicate with each other. In a refrigerator equipped with And a resistance means for the refrigerant and a refrigerant reservoir are arranged in series in the pressure guiding line, and 2) in the refrigerator of the above-mentioned item 1, the resistance means is a capillary tube, and further 3) in the item 1. In the refrigerator, the resistance means is achieved by being a control valve.

[0007]

In the present invention, as the above-mentioned structure, the suction port side of the compressor and the operation part of the refrigerant bypass valve are connected to communicate the refrigerant pressure of the operation part of the refrigerant bypass valve with the refrigerant pressure of the suction side of the compressor. By disposing the resistance means and the refrigerant reservoir in the corresponding pressure guiding pipe, the pressure of the operating portion of the refrigerant bypass valve is the pressure of the refrigerant accumulated in the refrigerant reservoir, and the pressure of the refrigerant reservoir is the suction side of the compressor. When the pressure drops, the refrigerant in the refrigerant reservoir gradually flows out to the suction side of the compressor through the resistance means, and when the pressure on the suction side of the compressor rises, the refrigerant on the suction side of the compressor acts as the resistance means. Since it gradually changes into the refrigerant reservoir through the refrigerant, it slows the opening / closing operation according to the suction side pressure of the refrigerant bypass valve, and the refrigerant bypass valve starts the opening operation. With the refrigerant bypass valve near the set pressure To prevent the occurrence of hunting operation of the origination pressure regulating valve.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a refrigerant circuit diagram of a refrigerator according to an embodiment of the present invention. The same parts as those in the conventional example of FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. In FIG. 1, reference numeral 11 denotes a refrigerant reservoir which is a container for storing the refrigerant 1a arranged in the conduit of the pressure guiding tube 10, and 12 flows through the pressure guiding tube 10 which is connected to the refrigerant reservoir 11 in series. It is a capillary tube as a resistance means for the refrigerant 1a. Since the present invention has such a configuration, when the heat load is reduced, the valve opening of the evaporation pressure adjusting valve 5 is reduced, and the suction side pressure of the compressor 1 drops below a predetermined set pressure, the refrigerant bypass valve 9 However, even if the suction side pressure of the compressor 1 is reduced, the refrigerant 1a in the refrigerant reservoir 11 is gradually transferred to the suction port side of the compressor 1 via the capillary tube 12. Since it does not flow out, the change of the pressure of the refrigerant 1a in the refrigerant reservoir 11 and hence the pressure value of the operating portion of the refrigerant bypass valve 9 becomes slow. As a result, for example, under operating conditions where there is not much load fluctuation, the refrigerant bypass valve 9 opens its valve only slowly, so that the temperature of the cooling liquid rises slowly and the temperature control type evaporation pressure adjusting valve 5 opens. The degree of throttle can be slowed down, and the refrigerant bypass valve 9 and the evaporation pressure adjusting valve 5 are close to each other in the vicinity of the set pressure on the suction side of the compressor 1 where the refrigerant bypass valve 9 starts the opening operation. Occurrence of hunting operation can be prevented.

In the above description, the resistance means for the refrigerant 1a arranged in the conduit of the pressure guiding tube 10 is a capillary tube, but it may be a control valve, and in this case, the resistance means is also used. It is possible to obtain the same effect as that of the capillary tube described above, and it is possible to obtain a more preferable effect by appropriately adjusting the valve opening degree of the control valve.

[0010]

According to the present invention, the suction port side of the compressor and the operating portion of the refrigerant bypass valve are connected to communicate the refrigerant pressure of the operating portion of the refrigerant bypass valve with the refrigerant pressure of the suction side of the compressor. By disposing the resistance means and the refrigerant reservoir in the pressure pipe, the hunting operation between the refrigerant bypass valve and the evaporation pressure adjusting valve is performed near the set pressure on the suction side of the compressor where the refrigerant bypass valve starts the opening operation. It is possible to prevent the occurrence, and it is possible to always perform highly accurate temperature control of the cooling liquid temperature.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram of a refrigerator according to the related art.

[Explanation of symbols]

1 compressor 1a Refrigerant 2 condenser 3 expansion valve 4 evaporator 5 Temperature control evaporation pressure control valve 9 Refrigerant bypass valve 10 Pressure guide tube 11 Refrigerant reservoir 12 Resistance means

Claims (3)

[Claims] 1. An evaporator that produces cold heat by evaporating a refrigerant, and a compressor that sucks in and compresses the refrigerant, which has a low pressure by evaporating by the evaporator, from a suction port and discharges it from a discharge port. A condenser that cools the high-temperature refrigerant that is compressed by the compressor, an expansion valve that is connected downstream of the condenser and that expands the high-pressure refrigerant that is compressed by the compressor, the evaporator and the A temperature control type evaporative pressure adjusting valve inserted between the suction ports of the compressor, a refrigerant bypass pipe connecting the discharge port of the compressor and the inlet side of the evaporator, and the refrigerant bypass pipe inserted into the refrigerant bypass pipe. A refrigerant bypass valve that opens when the refrigerant pressure on the suction side of the compressor reaches a preset set pressure, and a refrigerant bypass valve that connects the compressor suction port side and the operation section of the refrigerant bypass valve Refrigerant pressure in operating part and suction of compressor In the refrigerator having a connecting pipe to allow mutually communicates the refrigerant pressure of the refrigeration machine, characterized in that arranged a resistor means and coolant reservoir for the refrigerant in series electrical pressure line. 2. The refrigerator according to claim 1, wherein the resistance means is a capillary tube. 3. The refrigerator according to claim 1, wherein the resistance means is a control valve.