JPS6148067B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air extraction device for an absorption refrigerator that performs an absorption refrigeration cycle using a refrigerant and an absorption solution.

In the case of an absorption chiller, the presence of non-condensable gas such as air leaking from outside the machine or gas generated inside the machine will cause the capacity of the chiller to decrease, and in severe cases, it will become inoperable. It is necessary to exclude non-condensable gases.

Methods for collecting and eliminating non-condensable gas include a method in which a vacuum pump directly sucks and discharges the non-condensable gas from an absorber, etc., a method in which the discharged liquid from a solution pump is guided to an ejector and collected by suction, or a method in which it flows into an absorber. There is a method in which a part of the concentrated solution is cooled, a low-pressure part is formed, and the solution is collected by suction.

However, in the case of an air bleed system that uses a portion of a concentrated solution, if the concentration of the solution rises abnormally due to air leakage from outside the machine or changes in cold water or cooling water temperature, crystals may form and the bleed system However, there is a drawback that it does not work satisfactorily.

The aim of the invention is to eliminate this drawback and
The object of the present invention is to provide a device that can effectively eliminate non-condensable gas.

That is, to summarize the present invention, the present invention provides an absorption refrigerator that includes an absorber, an evaporator, a generator, a condenser, a heat exchanger, and a refrigerant path and a solution path that connect these. A part of the concentrated solution flowing into the absorber is branched into the arranged bleed tank, and a pipe is provided to connect the bleed tank and the absorber, and a concentration adjustment pipe is connected between the bleed tank and the evaporator. The present invention relates to a bleed device for an absorption refrigerator, which is characterized in that it is connected to the bleed device.

Hereinafter, the present invention will be explained in detail based on the accompanying drawings.

FIG. 1 is a system diagram of a single-effect absorption refrigerator device showing an embodiment of the present invention.

The absorption refrigerating machine shown in FIG.
3. Solution pump 6, refrigerant pump 7, cooling water passage 8, cold water passage 9, heating source 1 to drive them.
0, and each piping 14 to 22 are arranged.

In FIG. 1, a cooling pipe 16 branched from the absorber 1 inlet side of the cooling water passage 8 passes through the bleed tank 11 and is connected to the absorber outlet side. A part of the concentrated solution that is heated and concentrated by the heat source 10 in the generator 3 and flows into the absorber 1 through the heat exchanger 5 and piping 14 is guided to the bleed tank 11 through a branch pipe 15 .

In the bleed tank 11, a part of the concentrated solution flowing through the branch pipe 15 is cooled by the cooling water pipe 16.
Since a low-pressure part is formed that is slightly lower than the pressure of the absorber 1, a part of the refrigerant vapor and non-condensable gas in the absorber are sucked into the extraction tank 11 through the non-condensable gas collection pipe 17, and the refrigerant vapor becomes a concentrated solution. Absorbed.

The solution, which has been cooled by the cooling pipe 16 and has absorbed a portion of the refrigerant vapor, passes through the siphon pipe 18 and is guided to the gas-liquid separator 12 while entraining the non-condensable gas sucked into the bleed tank 11, where it is separated from the non-condensable gas. The non-condensable gas separated from the solution ascends through the gas passage 22 and is stored in the non-condensable gas reservoir 13. On the other hand, the solution is returned to the suction side of the solution pump 6 through a solution return pipe 20.

Further, in the air extraction device of the present invention, a concentration adjustment pipe 19 that communicates the evaporator 2 and the air extraction tank 11 is provided.

In an absorption refrigerator, as the average concentration of the solution during the solution cycle increases, the amount of refrigerant held in the evaporator 2 increases.

Therefore, the outlet of the refrigerant pipe 19 should be installed at a position where the refrigerant will overflow when the solution rises to a predetermined concentration or higher, that is, when the refrigerant liquid level in the evaporator rises to a predetermined height or higher. For example, even if the solution concentration abnormally increases due to air leakage from outside the machine, chilled water, or fluctuations in cooling water temperature, the refrigerant in the evaporator 2 will overflow and flow into the bleed tank, causing crystallization. Precipitation can be prevented and normal extraction operation can be maintained.

In another example of the embodiment of the present invention, the cooling pipe 16 may be branched from the cold water passage 9 in the above case.

Next, FIG. 2 is a system diagram of a dual-effect absorption refrigerating machine which is an embodiment of the present invention.

In Figure 2, symbols 1, 2, 4, 6 to 9, 1
1 to 22 have the same meanings as in FIG. 25 is a first generator, 26 is a second generator, 27 is a second heat exchanger, and 28 is a first heat exchanger.

Also in the double effect absorption refrigerator according to the present invention shown in FIG.
The operation and effect of No. 9 are the same as those of the device shown in FIG.

As described in detail above, according to the present invention, a part of the concentrated solution flowing into the absorber is branched to the bleed tank having a cooling pipe arranged inside, and a pipe connecting the bleed tank and the absorber is provided. By connecting the bleed tank and the evaporator with a concentration adjustment pipe, it is possible to effectively eliminate non-condensable gases, and also to prevent the concentration of the solution from increasing abnormally.
In practical terms, it is more effective than conventional absorption refrigerators in that crystal precipitation within the bleed device can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a single-effect absorption refrigerator device showing an embodiment of the present invention. FIG. 2 is a system diagram of a dual-effect absorption refrigerator device showing an embodiment of the present invention. 1: Absorber, 2: Evaporator, 3: Generator, 4: Condenser, 5: Heat exchanger, 6: Solution pump, 7: Refrigerant pump, 8: Cooling water passage, 9: Cold water passage, 10:
heating source, 11: extraction tank, 12: gas-liquid separator,
13: Non-condensable gas reservoir, 19: Concentration adjustment tube, 2
5: first generator, 26: second generator, 27: second
Heat exchanger, 28: first heat exchanger.

Claims (1)

[Claims] 1. In an absorption refrigerator consisting of an absorber, evaporator, generator, condenser, and heat exchanger, and a refrigerant path and a solution path that connect them, air flows into the absorber into a bleed tank with a cooling pipe inside. Absorption refrigeration characterized in that a part of the concentrated solution to be extracted is branched, a pipe line is provided to connect the bleed tank and the absorber, and the bleed tank and the evaporator are further connected by a concentration adjustment pipe line. Air extraction device of the machine.