JPS6125982B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-effect absorption refrigerating machine, and more particularly, to a dual-effect absorption refrigerating machine that prevents refrigerant vapor from entering the solution system, which is likely to occur when the load fluctuates.

Dual-effect absorption refrigerators generally use a lithium salt aqueous solution as the absorption solution and water as the refrigerant.In order to obtain cold water, the evaporated refrigerant evaporated in the evaporator is absorbed into the absorption solution in the absorber. The solution (dilute solution) that has absorbed this refrigerant is heated and concentrated using a high-temperature heat source such as a burner in a high-temperature regenerator to obtain an intermediately concentrated solution, and then the intermediately concentrated solution is further regenerated in a low-temperature regenerator in the high-temperature regenerator described above. A circulation system is provided to regenerate the absorption solution and refrigerant by heating again with the evaporated hot refrigerant vapor to obtain a concentrated solution and to use these again in the evaporator and absorber to obtain chilled water. There is. It goes without saying that the refrigerant vapor obtained from the low-temperature regenerator is condensed in the condenser.

By the way, in such a dual-effect absorption refrigerator, for example, as the amount of heating in the high-temperature regenerator increases, the amount of solution circulated increases, or conversely, as the amount of heating decreases, the amount of solution circulated increases. However, in such cases, refrigerant vapor gets mixed into the solution path, resulting in a reduction in refrigeration capacity.

Therefore, in the past, capillaries, orifices, motor valves, etc. were installed in the solution path from the high-temperature regenerator to the low-temperature regenerator to maintain the pressure difference. Although it is possible to prevent steam from entering,
This method has the drawback of not being able to deal with excessive load fluctuations, allowing steam to enter, or storing more solution in the high-temperature regenerator than necessary.

The present invention has been made with the aim of eliminating such conventional drawbacks.

An embodiment of the dual-effect absorption refrigerator according to the present invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 1 is a system diagram showing one embodiment of the present invention. First, the configuration will be explained. 1 is a high-temperature regenerator that heats and concentrates a dilute solution using a high-temperature heat source such as a gas burner, and 2 is a high-temperature regenerator. a separator for separating the solution heated in step 1 into an intermediate concentrated solution and a refrigerant vapor;
3 is a low-temperature regenerator that uses the refrigerant vapor from the high-temperature regenerator 1 as a heat source to reheat the intermediate concentrated solution from the high-temperature regenerator 1 and further separates the refrigerant vapor; 4 is a low-temperature regenerator that condenses the refrigerant vapor from the low-temperature regenerator 3; A condenser 5 for cooling the refrigerant used as a heating source in the low-temperature regenerator 3 uses the latent heat generated when the refrigerant from the condenser 4 is evaporated to cool the chilled water of the load. An evaporator, 6 an absorber for absorbing the refrigerant vapor from the evaporator 5 into the concentrated solution concentrated in the low temperature regenerator 3, and 7 a solution for flowing the dilute solution from the absorber 6 into the high temperature regenerator. A circulation pump, 8 a low-temperature heat exchanger, 9 a high-temperature heat exchanger, and 10 a flow regulator using a shape memory alloy, are connected by pipes 11 to 20 and 23, 24, constitutes a cycle.

Next, the action will be explained.

In the dual-effect absorption refrigerator, the intermediate concentrated solution is concentrated in the high-temperature regenerator 1 and the refrigerant is separated in the separator 2.
Passing through the pipe 14 and passing through the high temperature heat exchanger 9, the pipe 15
Here, the flow rate is controlled by the flow rate regulator 10 and flows into the low temperature regenerator 3.

Next, this flow regulator 10 will be explained in detail. As shown in FIG. 2, the flow rate regulator 10 includes a valve 22 that moves by the expansion and contraction of a spring 21 made of a shape memory alloy provided at the outlet of the intermediate concentrated solution pipe 15.
It is composed of. Since the shape memory alloy has the property of returning to its original shape when the temperature exceeds a certain critical temperature, the spring 21 expands and contracts depending on the temperature of the intermediate concentrated solution exiting the pipe 15.

For example, when the heating amount of the high-temperature regenerator 1 increases, the temperature at the outlet of the intermediate concentrated solution pipe 15 increases accordingly. Here, by processing the shape memory alloy that forms the spring 21 to memorize a shape that shrinks at high temperatures, the valve 22 opens as the spring 10 contracts as the temperature rises, and the outlet of the pipe 15, that is, the nozzle. The opening area of the outlet can be increased. Moreover, when the heating amount of the high temperature regenerator 1 decreases, the spring 21
increases, and the opening area of the nozzle outlet decreases accordingly. This makes it possible to cope with changes in the circulation flow rate of the solution in proportional or stepwise control of the heating amount of the high-temperature regenerator 1 to the load, and maintains the solution from the high-temperature regenerator 1 to the low-temperature regenerator 3 at an appropriate flow rate. becomes possible.

It goes without saying that the valve 22 functions similarly even if it is provided on the conduit 16 side.

As explained above, according to the present invention, the following effects can be obtained.

When the heating amount of the high temperature regenerator 1 increases and the circulation amount of the solution increases accordingly, this flow rate regulator 1
The opening area of 0 is expanded, the solution is not stored in the high temperature regenerator 1 and the separator 2 more than necessary, the balance of the solution in the system is maintained, and normal operation can be continued. In addition, when the heating amount of the high temperature regenerator 1 decreases and the circulation amount of the solution decreases, the flow rate regulator 1
By narrowing the opening area of 0 and storing a certain amount of solution in the separator 2, it is possible to prevent steam from entering the low-temperature regenerator 3 and to prevent a decrease in the refrigerating capacity.

Furthermore, it is cheaper than a modular control valve, and its control is more stable than an orifice or capillary.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of a dual-effect absorption refrigerator according to the present invention, and FIG. 2 is a diagram showing a schematic configuration of an example of a flow rate regulator used in the present invention. . 1... High temperature regenerator, 2... Separator, 3... Low temperature regenerator, 4... Condenser, 5... Evaporator, 6... Absorber, 7... Solution circulation pump, 8... Low temperature heat exchanger, 9...high temperature heat exchanger, 10...flow regulator,
21... Spring using shape memory alloy, 22...
valve.

Claims (1)

[Claims] 1. A high-temperature regenerator that heats a dilute solution that has absorbed refrigerant with a high-temperature heat source, a low-temperature regenerator that heats an intermediate concentrated solution concentrated in this high-temperature regenerator with refrigerant vapor generated in the high-temperature regenerator, and this low-temperature regenerator. a condenser that condenses the refrigerant vapor generated in the refrigerant and the refrigerant used as a heating source; an evaporator that evaporates the liquid refrigerant from the condenser to obtain cold water; In a dual-effect absorption refrigerator, the double-effect absorption refrigerator has an absorber that absorbs the concentrated solution concentrated in the regenerator to form a dilute solution, and these are connected via piping to form a circulation system. A flow regulator using a shape memory alloy as at least a part of the valve mechanism is provided in the intermediate concentrated solution passage leading to the low temperature regenerator so that the opening area changes depending on the temperature of the intermediate concentrated solution passing through. A dual-effect absorption refrigerator.