JPS6024905B2 - Absorption chiller control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for an absorption refrigerator, and its purpose is to continuously monitor the full opening degree of a control valve that controls a heating source and to smoothly control the capacity. shall be.

When cold water for cooling or hot water for heating is supplied by an absorption chiller, the heating source is generally controlled by operating a control valve operator using a potentiometer that changes depending on the temperature of the cold water or hot water. .

Since this control is performed by a single operating device both during cooling and during heating, the degree of control of the control valve determined by the potentiometer is the same.

However, the demands from the load side do not necessarily mean that the maximum input during cooling and heating is the same, and there is generally a difference.

In this case, regardless of the opening of the actuator, if the maximum opening of the control valve connected to it by a mechanical link was mechanically limited, the control schedule would be as shown by the solid line in Figure 4, which would result in smooth control. do not have.

The present invention has been made in view of the above points, and an embodiment shown in the drawings will be described below.

1 is a high-temperature generator that has a combustion heating chamber 2 for burning fuel such as gas or oil, and scarlet tubes 3, 3, . A low-temperature generator uses the cold soot vapor sent out from 1 as a heat source to reheat and further heats and separates the intermediate liquid refrigerant. A condenser 7 is an evaporator configured to obtain cold water for air conditioning from a water cooler 8 by using latent heat when the liquid cooled soot from the condenser 5 is dispersed and vaporized, and 9 is an evaporator that uses the low temperature generator 4. an absorber 10 which is capable of maintaining the inside of the evaporator 7 at a low pressure and continuously supplying cold water by scattering pus from which cold soot has been separated and absorbing the cold soot vapor within the vessel; and 1
1 is a low-temperature and high-temperature solution heat exchanger, which includes a refrigerant vapor pipe 12, a refrigerant liquid down-flow pipe 13, a cold soot circulation path 15 having a soot pump 14, a dilute liquid pipe 17 having an absorption liquid pump 16,
A refrigeration cycle is constructed by connecting the pipes with an intermediate liquid pipe 18 and a concentrated liquid pipe 19.

2. Overflow device attached to the high temperature generator 1, 21, 22
, 23 are switching valves that perform cold switching.

24 is a fuel control valve as a heating control valve provided in the high temperature generator 1, and the control valve is a cold water temperature detector 25 provided at the outlet of the water cooler 8 or a hot water temperature detector 25 provided at the outlet of the water heater 20. The opening degree is adjusted by an output signal outputted from a signal from the detector 26 through a switching switch 27, a temperature regulator 28, an input side potentiometer 29, and a drive side potentiometer 30.

Reference numeral 31 is a variable resistor potentiometer connected in parallel to the input potentiometer 29 and the three drive potentiometers, and the resistance Z of the potentiometer is about ten times the resistance R of both the potentiometers 29 and 30. It is the size of

By changing this resistance Z, the relationship of the fuel control valve 24 can be freely selected from the range of control scales (1) to (2) in FIG. 3 using the drive side potentiometer 30, and proportional control becomes smooth. That is, the drive side potentiometer 30
When the signal is 100% Z=0, the full opening degree of the control valve 24 is 50%. As described above, the present invention connects a high temperature generator, a low temperature generator, a condenser, an evaporator forming a water cooler, an absorber, and a solution heat exchanger to form a refrigeration cycle, and provides hot water to the high temperature generator. In an absorption refrigerator equipped with a water cooler or water heater, the outlet temperature of the water cooler or water heater is detected and the heating control valve of the high temperature generator is operated via a temperature regulator, an input side potentiometer, and a drive side potentiometer. Since a variable resistor is connected in parallel to both of the potentiometers, the full opening of the control valve can be continuously and arbitrarily limited according to the demand from the load side of the water cooler or water heater, and the capacity can also be controlled. It can also be done smoothly.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an absorption refrigerator equipped with the device of the present invention;
FIG. 2 is an explanatory diagram of main parts, FIG. 3 is a control characteristic diagram, and FIG. 4 is a conventional characteristic diagram corresponding to FIG. 3. 1... High temperature generator, 8... Water cooler, 2
0... Water heater, 25... Cold water temperature detector, 26... Hot water temperature detector, 28...
・Temperature regulator, 29... Input side potentiometer, 30... Drive side potentiometer, 24.
... Heating control valve, 31 ... Variable resistance. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A high-temperature generator, a low-temperature generator, a condenser, an evaporator forming a water cooler, an absorber, and a solution heat exchanger are connected to form a refrigeration cycle, and a water heater is attached to the high-temperature generator. In the refrigerator, the outlet temperature of the water cooler or water heater is detected and the heating control valve of the high temperature generator is operated via a temperature regulator, an input side potentiometer, and a drive side potentiometer, and both of the potentiometers are controlled. A control device for an absorption refrigerator, characterized in that a variable resistor is connected in parallel to a yometer.