JPS6135890Y2 - - 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 valve disk 24 is formed with the pores 26, the flow path is formed in the pores 26.
As a result, the flow rate of the dilute solution is reduced. 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 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.

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

The present invention is characterized in that a refrigerant reservoir 16 is provided in a pipe line 10 that leads refrigerant from the condenser 4 to the evaporator 5. The liquid level of this refrigerant reservoir 16 is the same as that of the condenser 4.
It is determined by the water column difference ΔH corresponding to the pressure difference between the evaporator 5 and the evaporator 5. By the way, when the operating state of the refrigerator is switched between high and low, the evaporator 5
Although the pressure change is negligibly small, it causes a noticeable difference in the pressure in the condenser 4. Therefore, the refrigerant liquid level in the refrigerant reservoir 16 changes by the water column height corresponding to the pressure change in the condenser 4. Therefore, when the operating state of the refrigerator is switched from high to low or conversely from low to high, the pressure inside the condenser 4 changes rapidly immediately after switching. Therefore, for example, when the operating state is switched from high to low, the pressure in the condenser 4 decreases, the liquid level in the refrigerant reservoir 16 rises, and the amount of refrigerant flowing into the evaporator 5 decreases. The amount will be reduced by the amount stored in the refrigerant reservoir 16.
Conversely, when the operating state is switched from low to high, the pressure in the condenser 4 increases, so the liquid level in the refrigerant reservoir 16 decreases, and the flow rate of refrigerant to the evaporator 5 increases accordingly.

In this way, according to the present invention, it is possible to adjust the flow rate of refrigerant to the evaporator 5 in immediate response to switching of the operating state of the refrigerator, and no invalid refrigerant is generated during switching, so that the machine always operates efficiently. A water-lithium salt dual-effect absorption refrigerator is provided.

Moreover, in the present invention, the refrigerant reservoir 16 statically captures the pressure change in the condenser 4 due to the change in the heating amount under the stepwise control by the flow rate control valve 15, and uses the pressure difference between the evaporator 5 and the condenser 4 to cool the refrigerant. Since storage and release are performed, there is no need for any special equipment such as pressure sensing elements, pressure regulators, and control valves such as electric or solenoid valves, and therefore, inexpensive and highly reliable control is possible.

Although the embodiment of the present invention has been described with reference to the case where the operating state is switched to two stages, high and low, it goes without saying that the present invention can be implemented in the same way when the operating state is switched to multiple stages. It is possible to implement various changes without departing from the gist of the invention.

[Brief explanation of drawings]

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. It is a system diagram showing one example of an effect absorption refrigerator. 1... High temperature regenerator, 2... Separator, 3... Low temperature regenerator, 4... Condenser, 5... Evaporator, 6... Absorber, 7... Low temperature heat exchanger, 8... High Thermal heat exchanger, 9... Solution pump, 15... Flow rate control valve, 1
6...Refrigerant reservoir.

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 at least two stages, high and low, a refrigerant reservoir is provided in the refrigerant circuit connecting the condenser and the evaporator, and the refrigerant A water-lithium salt double-effect absorption refrigerator, characterized in that a reservoir stores an amount of liquid refrigerant corresponding to the pressure inside the condenser.