JPS5810941Y2 - Water ↓ - Lithium salt absorption refrigerator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a water-lithium salt absorption refrigerator.

A conventional refrigerator of this type is constructed as shown in FIG.

That is, 1 is a generator, 2 is a separator, 3 is a condenser, 4 is an evaporator, 5 is an absorber, 6 is an orifice, 7 is a heat medium supply port, 8 is a cooling water coil, 9 is an evaporator coil, 10 is a solution heat exchanger, 11 is a plurality of lift pipes arranged vertically in parallel in the generator 1, and 12 is a refrigerant return pipe.

This refrigerator supplies a heat medium such as hot water or steam from a heat medium supply lower to the area surrounding the liquid pumping pipe 11 in the generator 1, and also supplies the refrigerant condensed in the condenser 3 to the lower part of the generator 1. A portion of the refrigerant is returned through the orifice 6 and the refrigerant return pipe 12 to boil it, and the boiled refrigerant is supplied to the dilute solution in the lift pipe 11 through a nozzle (not shown).

Such a conventional refrigerator increases the heat transfer coefficient between the solution and the heating medium in the generator 1 and the amount of solution circulation, thus increasing the amount of heating medium,
It was effective in increasing stability against temperature changes, low-temperature heating media, etc.

The amount of auxiliary refrigerant returned to the generator 1 is determined by the inner diameter of the orifice 6, and conventionally, an amount equivalent to 7 to 10% of the total amount of refrigerant is returned.

However, this amount is necessary for stable operation when the heating medium temperature supplied from the heating medium lower is approximately 75°C, and if the heating medium temperature is high, a smaller amount of refrigerant may be sufficient. There was a waste of effort to return inactive refrigerant that does not contribute to cooling capacity.

In other words, Fig. 2 shows the characteristics of the required amount of auxiliary refrigerant with respect to the heating medium temperature. When the heating medium temperature varies between 75 and 100°C, the shaded range in Fig. 2 indicates the cooling capacity. It is easy to see how wasteful it is to keep the amount of auxiliary refrigerant returned to the generator 1 constant, as it becomes an ineffective refrigerant that does not contribute to the refrigerant.

The present invention has been developed based on the above-mentioned circumstances, with the object of providing a water-lithium salt type absorption refrigerator which eliminates the use of ineffective refrigerants as in the past and eliminates waste.

Next, an embodiment of the water-lithium salt absorption refrigerator according to the present invention will be described in detail with reference to FIG.

The present invention provides a plurality of orifices 6 for restricting the flow rate of the auxiliary refrigerant returned to the generator 1, which was conventionally provided with only one orifice, so that these orifices can be appropriately selected depending on the temperature of the heating medium. It is characterized by being able to control the flow rate of refrigerant.

That is, a second orifice 13 having a smaller diameter than the conventional orifice 6 is provided in parallel with the orifice 6, and the outlet portions of each orifice 6.13 are commonly connected to the refrigerant return pipe 12, and this common connection portion 14 A solenoid valve 15 is provided between the valve and the outlet of the orifice 6, and the rest is the same as the conventional one, so the same parts in FIG. 3 as in FIG. is omitted.

In the refrigerator of the present invention, when the temperature of the heat medium supplied to the generator 1 is, for example, 85° C. or higher, the solenoid valve 15 is closed so that only the refrigerant that has passed through the orifice 13 is returned to the generator 1. If the temperature is below 85°C, the solenoid valve 15 is opened to allow the refrigerant to return to the generator 1 through both orifices 6 and 13.

Therefore, if the diameter of the orifice 6.13 is determined based on the characteristic diagram in Figure 2, the amount of auxiliary refrigerant can be adjusted depending on whether the temperature is at least above or below the set temperature, and the use of ineffective refrigerant at high temperatures can be eliminated. If the diameter of the orifice 13 is set to 4% at 85° C., the loss in the cross-hatched area in FIG. 2 can be eliminated.

In the above-mentioned embodiment, the diameter of the orifice 6.13 was made smaller than the diameter of the orifice 13, but the diameter may be reversed or may be the same, and may be determined as appropriate in relation to the set temperature.

Further, the number of orifices may be two or more so that the amount of refrigerant can be adjusted at two or more set temperatures.

Furthermore, it is also possible to provide a temperature detector for detecting the temperature of the heat medium, and automatically control the solenoid valve in accordance with the temperature detected by this detector to adjust the amount of refrigerant.

As described above, according to the present invention, by adjusting the amount of refrigerant returned according to the temperature of the heating medium flowing inside the generator 1, waste of the refrigerant is eliminated and efficiency is increased in response to changes in the heating medium temperature. It is possible to provide a water-lithium salt absorption refrigerating machine that can operate well, and its practical effects are great.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the configuration of a conventional water-lithium salt type absorption refrigerator, Fig. 2 is a characteristic diagram showing the relationship between the predetermined amount of auxiliary refrigerant and the heating medium temperature in this type of refrigerator, and Fig. 3 is BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory diagram showing an embodiment of a water-lithium salt absorption refrigerator according to the present invention. 1... Generator, 2... Separator, 3...
... Condenser, 4 ... Bent evaporator, 5 ... Absorber, 6, 13 ... Orifice, 7 ...
Heat medium supply port, 8... Cooling water coil, 9...
...Evaporator coil, 10...Solution heat exchanger, 1
1... Lifting pipe, 12... Refrigerant return pipe,
14... Common connection part, 15... Solenoid valve.

Claims (1)

[Scope of utility model registration request] In a water lithium salt absorption refrigerator using a multi-tube lift pipe and returning a part of the condensed refrigerant to the lower part of the lift pipe via a return pipe, the return pipe has a plurality of orifices and an orifice. A selection solenoid valve is provided, and the solenoid valve is controlled according to the temperature of the heating medium supplied around the liquid pumping pipe, thereby controlling in stages the amount of refrigerant returned to the lower part of the liquid pumping pipe. A water-lithium salt absorption refrigerator characterized by: