JPS6135891Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a water-lithium salt double effect absorption refrigerator using water as a refrigerant and a lithium salt as an absorbent.

FIG. 1 is a system diagram of a conventional water-lithium salt double-effect absorption refrigerator. In the figure, 1 is a high-temperature regenerator into which a dilute solution that has absorbed refrigerant is introduced and heated by a heat source such as a burner, and 2 is a separator that separates the solution heated by the high-temperature regenerator into refrigerant vapor and intermediate concentrated solution. ,
3 is a low temperature regenerator, into which the high temperature intermediate concentrated solution from the separator 2 is lowered in temperature by heat exchange with the low temperature dilute solution in the high temperature heat exchanger 8; It is heated again by refrigerant vapor introduced into the low-temperature regenerator coil 14 from above. 4 is a condenser that condenses the refrigerant introduced from the low-temperature regenerator 3 and its coil 14 into a liquid refrigerant by cooling water flowing through the condensing coil 11; introduced and the evaporator coil 13
A concentrated solution is introduced from the low temperature regenerator 3 via the low temperature heat exchanger 7, and the concentrated solution is introduced into the evaporator 5 from the low temperature regenerator 3 through the low temperature heat exchanger 7. An absorber that absorbs evaporated refrigerant vapor to form a dilute solution; 9 is a solution pump that sends the dilute solution in the absorber 6 to the high-temperature regenerator 1 side; 12 is a solution pump that removes the absorbed heat in the absorber 6; 15 is a flow control valve.

As shown in FIG. 2, the details of the flow rate control valve 15 are composed of an electromagnetic coil 21, a plunger 22, a coil spring 23, a valve disk 24, and a nozzle 25. In the illustrated state, the electromagnetic coil 21
The plunger 22 is attracted by the pump, and the flow rate control valve 15 is in an open state. Therefore, in this state, the dilute solution will flow at the maximum flow rate in the direction of the arrow. On the other hand, when the electromagnetic coil 21 is de-energized, the plunger 22 is pushed down by the coil spring 23 and the tip of the valve disc 24 is connected to the nozzle 2.
5. Here, since the pores 26 are formed in the valve disk 24, the flow path is constricted to the size of the pores 26, and the flow rate of the dilute solution is constricted. This state will be called a closed state.

Therefore, by opening and closing the flow rate control valve 15, the operating state of the refrigerator can be switched between a high state and a low state. Of course, it goes without saying that the heating amount of the high temperature regenerator 1 is also reduced in the low state.

By the way, when switching the operating state of the refrigerator from high to low, the flow rate control valve 15 is closed and the heating source of the high temperature regenerator 1 is throttled to reduce the amount of heating. Although the flow rate of the concentrated solution normally reaches the flow rate of the low operating state after a dozen or so seconds after closing the flow rate control valve 15, the amount of refrigerant flowing into the evaporator 5 only gradually decreases for several minutes and is very difficult to follow. It's late. The reason is,
Inner surface of low temperature regenerator coil 14, condenser coil 11
Amount of refrigerant on the surface, high temperature regenerator 1, low temperature regenerator 3
This is thought to be due to the amount of heat held by the solution within the chamber.

Due to this phenomenon, the amount of concentrated solution flowing into the absorber 6 is in a low state and is decreasing, and even though the absorption capacity is decreasing, the refrigerant flow rate to the evaporator 5 continues to be in a high state. The refrigerant could not be completely evaporated and became an ineffective refrigerant, resulting in a decrease in refrigeration efficiency.

The present invention was developed based on these circumstances, and its purpose is to balance the flow rates of the solution and refrigerant to suit the operating state when the operating state is changed, thereby preventing a decrease in refrigeration efficiency. It is an object of the present invention to provide a water-lithium salt double-effect absorption refrigerator which prevents the above-mentioned effects.

Embodiments of the present invention will be described in detail below with reference to FIGS. 3 and 4. Note that in FIGS. 3 and 4, the same parts as in FIG. 1 are given the same reference numerals, so the explanation of those parts will be omitted.

The embodiment shown in FIG. 3 is characterized in that a flow control valve 16 is provided in a pipe line 10 that guides the refrigerant from the condenser 4 to the evaporator 5. This flow control valve 1
Reference numeral 6 has the same structure as the flow rate control valve 15 provided on the discharge side of the solution pump 9, the details of which are shown in FIG.

Therefore, when switching the operating state of the refrigerator from high to low, the flow rate control valve 16 provided in the conduit 10 is also closed in conjunction with the closing of the flow rate control valve 15. Of course, the flow rate control valves 15 and 16 are opened in conjunction with each other when switching from the low state to the high state.
In this way, the solution flow rate and refrigerant flow rate are balanced according to the operating state of the refrigerator, and the amount of refrigerant that matches the absorption capacity is evaporated, thereby preventing the generation of ineffective refrigerant and reducing the refrigerating capacity. I won't let you.

FIG. 4 shows another embodiment of the present invention.
Instead of the flow rate control valve 16 in FIG. 3, a refrigerant reservoir 17 and a solenoid valve 18 are connected in series in the pipe line 10, and an overflow pipe 19 is provided in the refrigerant reservoir 17.
The tip of the overflow pipe 19 is introduced into the evaporator 5.

In this embodiment, when the refrigerator is operating in a high state, the solenoid valve 18 is kept open.
The liquid refrigerant from the condenser 4 is transferred to a pipe 10 and a refrigerant reservoir 1.
7. An amount of refrigerant suitable for high operating conditions is introduced into the evaporator 5 by simply passing through the solenoid valve 18. On the other hand, when switched to the low state, the solenoid valve 18 is closed and the refrigerant passage is cut off. Therefore, the refrigerant begins to be stored in the refrigerant reservoir 17, and after a predetermined amount of refrigerant is stored, the overflowing amount flows to the evaporator 5 through the overflow pipe 19. Therefore, the flow rate of the refrigerant at this time becomes an amount suitable for low operation after a time delay than when the operation state is switched after it has stopped, and therefore does not exceed the absorption capacity and is used as an ineffective refrigerant. does not occur, and the refrigeration capacity will not be reduced.

The present invention is not limited to the above-mentioned embodiments, but
It goes without saying that various modifications can be made without departing from the scope of the invention.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of a conventional water-lithium salt system dual-effect absorption refrigerator, Fig. 2 is a sectional view showing an example of a flow control valve, and Fig. 3 is a water-lithium salt system dual-effect absorption refrigerator according to the present invention. A system diagram showing an example of an effective absorption refrigerator,
FIG. 4 is a system diagram of another embodiment of the present invention. 1... High temperature regenerator, 2... Separator, 3... Low temperature regenerator, 4... Condenser, 5... Evaporator, 6... Absorber, 7... Low temperature heat exchanger, 8... High Heat exchanger, 9...Solution pump, 10...Pipe line, 15, 1
6...Flow rate control valve, 17...Refrigerant reservoir, 18...Solenoid valve, 19...Overflow pipe.

Claims (1)

[Scope of utility model registration request] A high-temperature regenerator that heats the dilute solution, a separator that separates the solution heated by the high-temperature regenerator into refrigerant vapor and an intermediate concentrated solution, and after the intermediate concentrated solution separated by the separator is cooled down once. a low-temperature regenerator heated by the refrigerant vapor supplied by the refrigerant and separated by the separator; a condenser that condenses the refrigerant from the low-temperature regenerator to form a liquid refrigerant; An evaporator for evaporating, an absorber for absorbing the refrigerant vapor evaporated by the evaporator into a concentrated solution from the low-temperature regenerator to form a dilute solution, and a flow rate of the dilute solution sent from the absorber to the high-temperature regenerator side. In a water-lithium salt double-effect absorption refrigerator having a flow rate control valve that controls the flow rate in two stages, high and low, the refrigerant circuit connecting the condenser and the evaporator is provided with a 1. A water-lithium salt double-effect absorption refrigerating machine characterized by being provided with a flow rate controller for controlling the refrigerant in two stages, high and low.