JPS60152863A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a refrigeration system used for processing gaseous waste in nuclear power plants.

[Technical Background of the Invention] Gaseous waste from nuclear power plants undergoes various treatments to remove dust and gas, and is cooled by a refrigeration system to condense and remove the moisture contained therein before being released into the atmosphere. released. Conventionally, the above-mentioned cooling device was constructed as shown in FIG.

That is, 1 in the figure is a compressor, and the refrigerant compressed by this compressor 1 is sent to a condenser 2 where it is cooled and condensed.
liquefied. The liquefied refrigerant is then sent to the evaporator 4 via the thermoelectric expansion valve 3, where it evaporates and is cooled. Exhaust gas from the nuclear power generation facility is passed through the evaporator 4, and the exhaust gas is cooled to condense and remove moisture contained therein. Further, the refrigerant gas discharged from the evaporator 4 is sent to the compressor 1 via the return pipe 5. Further, the high temperature refrigerant gas from the compressor 1 is sent directly to the evaporator 4 via the bypass pipe 6. A capacity control valve 7 is provided in the middle of this pie bus piping 6. The capacity control valve 7 sends a portion of the refrigerant gas from the compressor 1 directly to the evaporator 4 in accordance with the opening degree of the thermoelectric expansion valve 3 to adjust the refrigerating capacity of the refrigeration system. It is configured. Furthermore, a temperature detector 8 is provided on the outlet side of the evaporator 4 to detect the temperature at the outlet of the refrigerant from the evaporator 4.

The signal from this temperature detector 8 is then passed through an electric signal converter 9 and a time constant adjuster 10 to an expansion valve driving amplifier 11.
sent to. This expansion valve driving amplifier 11 detects the load of this refrigeration system from the refrigerant outlet temperature of the evaporator 4,
Corresponding to this load, driving power is supplied to the thermoelectric expansion valve 3, and the heater of the thermoelectric expansion valve 3 is heated to adjust the opening degree.

Incidentally, the relationship between the voltage applied to the thermoelectric expansion valve 3 and its opening degree generally has a characteristic as shown in FIG. In order to compensate for the characteristics of the thermoelectric expansion valve 3 and the characteristics of the entire refrigeration system, the time constant regulator 10 and the like are so-called PIDs equipped with circuits for performing proportional control, integral control, and differential control. Using a regulator, set the time constant etc. to compensate for these weights. Therefore, the relationship between the load of the refrigeration system and the output of the expansion valve driving amplifier 11 is set to the characteristics shown in FIG. In addition, the opening degree of the capacity control valve 7 is the same as that of the thermoelectric expansion valve 3.
As shown in FIG. 4, there is an inversely proportional relationship with the opening degree of Therefore, the flow rate of high temperature refrigerant gas sent from the compressor 1 to the evaporator 4 increases.

[Problems with background technology] By the way, the flow rate of exhaust gas emitted from nuclear power generation equipment,
The fluctuation range of temperature and the like is generally large, and the load fluctuation of this refrigeration system is also large. For this reason, 1. If the control base is set to accommodate a relatively large load on this refrigeration system, the opening degree of the thermoelectric expansion valve 3 may become smaller than necessary when the load is small. There was a problem in that the settings of the constant adjuster 10 were extremely delicate and the setting work required a long time. In addition, when the load is small, the opening degree of the thermoelectric expansion valve 3 becomes zero or close to zero, and the opening degree of the capacity control valve 7 increases, causing a large amount of high-temperature refrigerant gas from the compression t11 to flow into the evaporator. 4, and there was a possibility that the refrigeration system would stop cooling.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and its purpose is to provide a refrigeration system in which tJyi is easy and there is no possibility that the refrigeration system will stop even when the load is small.

(Summary of the Invention) That is, the present invention includes a compressor, a condenser that liquefies refrigerant from the compressor, an evaporator that evaporates the liquefied refrigerant from the condenser, and a compressor that supplies the liquefied refrigerant from the condenser to the evaporator. an expansion valve that controls the amount of liquefied refrigerant supplied; a bypass pipe that directly sends the refrigerant from the compressor to the evaporator; a capacity control valve provided in the middle of the bypass pipe; A temperature detector detects the refrigerant outlet temperature of the refrigerant, and a signal from the above temperature detector is inputted via a time constant controller.The load of the refrigeration system is detected from this refrigerant outlet temperature, and the above expansion is performed in response to this load. The present invention includes an expansion valve driving amplifier that controls the opening degree of the valve and prevents the opening degree of the expansion valve from becoming less than a predetermined opening degree when the load is small. Therefore, even when the load on this refrigeration system is small, the opening degree of the expansion valve will not fall below the predetermined opening degree, making adjustment work easier. Since this is maintained above, it is possible to reliably prevent the refrigeration system from stopping when the load is small.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 5 to 7. In the figure, 101 is a compressor, and the refrigerant compressed by this compressor 101 is sent to a condenser 102 where it is cooled, condensed, and liquefied.

The liquefied refrigerant is then sent to the evaporator 104 via the thermoelectric expansion valve 103, and is evaporated within the evaporator 104 for cooling. Exhaust gas from the nuclear power generation facility is passed through the evaporator 104, and the exhaust gas is cooled to condense and remove moisture contained therein. Further, the refrigerant gas discharged from this evaporator 104 is returned to a return pipe 105.
is sent to the compression 11101 described above. Further, the high temperature refrigerant gas from this compressor 101 is transferred to the bypass pipe 1
06 directly to the evaporator 104. A capacity control valve 107 is provided in the middle of this bypass piping 106. The capacity control valve 107 sends a portion of the refrigerant gas from the compressor 101 directly to the evaporator 104 in accordance with the opening degree of the thermoelectric expansion valve 103 to adjust the refrigerating capacity of the refrigeration system. It is configured. Furthermore, a temperature detector 108 is provided on the exit side of the evaporator 104 to detect the temperature of the refrigerant exit from the evaporator 104. A signal from the temperature detector 108 is sent to an expansion valve driving amplifier 111 via an electric signal converter 109 and a time constant adjuster 110. This expansion valve driving amplifier 1
11 detects the load of this refrigeration system from the refrigerant outlet temperature of the evaporator 104, and supplies driving power to the thermoelectric expansion valve 103 in accordance with this load, and operates the thermoelectric expansion valve 103. The opening degree is adjusted by heating the heater 103.

The expansion valve driving amplifier 11 described above is constructed as shown in FIG. That is, in the figure, 121 is an addition/subtraction calculator, and 122 is a control section. The signal from the time constant adjuster 110 is input to the addition/subtraction calculator 121 and compared with the feedback signal from the control section 122, and the difference is sent to the control section 122. The control section 12'2 controls the amplification section 123 based on this signal, and the amplification section 123 outputs driving power corresponding to the signal from the time constant adjuster 1.10. Also, 124
is the power supply section. This power supply unit 124 is provided with a setting variable resistor 125 and is configured to send a predetermined setting signal to the addition/subtraction calculator 121. Therefore, the lower limit of the output from the amplifying section 123 is regulated by the setting signal from the setting variable resistor 125, and even when the load on the refrigeration system is small, the output from the amplifying section 123 remains at a predetermined value. It cannot be less than that.

Incidentally, the relationship between the input and output horn of this expansion valve driving amplifier 111 is shown in FIG.

〔Effect of the invention〕

As mentioned above, this light includes a compressor, a condenser that liquefies refrigerant from the compressor, an evaporator that evaporates the liquefied refrigerant from the condenser, and a supply of the refrigerant from the condenser to the evaporator. an expansion valve that controls the supply amount of liquefied refrigerant; a bypass pipe that directly sends refrigerant from the compressor to the evaporator; a capacity control valve provided in the middle of the bypass pipe; A temperature detector detects the refrigerant outlet temperature, and a signal from the above-mentioned temperature detector is inputted via a time constant regulator, and the load of the refrigeration system is detected from this refrigerant outlet temperature, and the expansion valve is activated in response to this load. and an expansion valve driving amplifier that controls the opening degree of the expansion valve and prevents the opening degree of the expansion valve from becoming less than a predetermined opening degree when the load is small. Therefore, even when the load on this refrigeration system is small, the opening degree of the expansion valve will not fall below the predetermined opening degree, making adjustment work easier. Since the refrigeration system is maintained at the following level, it has great effects, such as being able to reliably prevent the refrigeration system from stopping even when the load is small.

[Brief explanation of the drawing]

Figures 1 to 4 show conventional examples, Figure 1 is a schematic configuration diagram, Figure 2 is a diagram showing the relationship between applied voltage and valve opening of a thermoelectric expansion valve, and Figure 3 is a refrigeration FIG. 4 is a diagram showing the relationship between the load of the device and the amplifier output of the expansion valve driving amplifier; FIG. 4 is a diagram showing the relationship between the load of the refrigeration device and the opening degrees of the thermoelectric expansion valve and the capacity control valve. . 5 to 7 show an embodiment of the present invention, FIG. 5 is a schematic configuration diagram, FIG. 6 is a circuit diagram of an amplifier for driving an expansion valve, and FIG. 7 is a circuit diagram of an amplifier for driving an expansion valve. It is a microcosm showing the relationship with output. 101... Compressor, 102... Condenser, 103...
・Thermoelectric expansion valve, 104... Evaporator, 107...
Capacity control valve, 108... Temperature detector, 110... Time constant regulator, 111... Expansion valve driving amplifier, 121
... Addition/subtraction calculator, 122... Control section, 123...
Amplification section, 125... variable resistor for setting. Applicant's representative Patent attorney Takehiko Suzue 1 Figure 1 Figure 2 Figure 3 Small vt! Tao □ Shaku Heng Ken Bo Gon d Jin Ken Figure 4・）Electric Bridge □ Nu9ji'l/? underground bunker

Claims (1)

[Claims] a compressor; a condenser for liquefying refrigerant from the compressor;
An expansion valve for controlling the supply amount of the liquefied refrigerant to evaporate the liquefied refrigerant from the condenser, and a bypass pipe that directly sends the refrigerant from the compressor to the evaporator, and a capacity provided in the middle of this bypass pipe. A control valve, a temperature detector that detects the refrigerant outlet temperature from the evaporator, and a signal from the above temperature detector are inputted via a time constant regulator, and the load of the refrigeration system is detected from this refrigerant outlet temperature. and an amplifier for driving the expansion valve, which controls the opening degree of the expansion valve in response to the load and prevents the opening degree of the expansion valve from falling below a predetermined opening degree when the load is small. A refrigeration device featuring: