JPH08159608A - Vaporizer in absorption refrigerator - Google Patents

Abstract

PURPOSE: To extend a volume control range of an absorption refrigerator by forming an alcohol storage unit which segments a liquid pool with a submerged weir and installing a supply opening of liquid refrigerant to the upper part and opening a suction opening of liquid refrigerant and alcohol to the lower part. CONSTITUTION: A small area alcohol storage part 21 which segments a liquid pool 11 with a submerged weir 20 is formed. A supply opening 5 of liquid refrigerant including alcohol transferred from a condenser is opened at the upper part of the alcohol storage part 21, and a suction opening is opened on a bottom plate of a housing 10 at the lower part of the alcohol storage part 21. The liquid refrigerant supplied from the supply opening 5 moves to the liquid pool 11 outside the alcohol storage part 21 passing through the lower part of the installing weir 20 but the alcohol floating on the liquid surface of the liquid refrigerant remains in the alcohol storage unit 21. When a circulation pump 4 is started, a large amount of alcohol 2 is sucked up into the suction opening 22 together with the liquid refrigerant and sprayed to a bundle of tubes 13 by way of a pipeline 13.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an evaporator in an absorption refrigerator.

[0002]

2. Description of the Related Art An example of an evaporator in a conventional absorption refrigerator is shown in FIG. A tube bundle 3 in which a cooling liquid circulates is arranged in an upper part of a casing 10 of the evaporator 100, and a liquid reservoir 11 for storing the liquid refrigerant 1 is formed in a lower part thereof, and a liquid surface of the liquid refrigerant 1 is formed on the liquid surface. Alcohol 2 with a small specific gravity is emerging. Case
A suction port 6 is formed in the central portion of the bottom plate of 10, and the suction port 6
A circulation pump 4 is connected to the pump via a suction pipe 12.

During operation of the absorption refrigerator, the liquid refrigerant containing alcohol transferred from a condenser (not shown) is supplied from the supply port 5 to the liquid reservoir 11 and temporarily stored therein. The liquid refrigerant 1 and the alcohol 2 in the liquid reservoir 11 are sucked from the suction port 6 through the suction pipe 12 into the circulation pump 4 and are energized, pass through the pipe 13, and are sprayed from the sprayer 14 to the pipe bundle 3.

Then, in the process of passing through the outer surface of the tube bundle 3, heat is exchanged with the cooling liquid circulating in the tubes to cool it, and a part thereof is evaporated, and the evaporated gas refrigerant and alcohol are evaporated. It is sent from the inside to an absorber (not shown) where it is absorbed by the absorbing liquid. The liquid refrigerant and alcohol that have not evaporated are dropped from the tube bundle 3 into the liquid reservoir 11 and stored therein.

[0005]

In an absorption refrigerator, the amount of refrigerant enclosed therein is the capacity of the absorption refrigerator (
Therefore, it is desirable to increase the amount of refrigerant enclosed in order to widen the capacity control range.

However, in the above-mentioned conventional absorption refrigerator, when the amount of the refrigerant filled therein is increased, the amount of the liquid refrigerant 1 stored in the liquid reservoir 11 at the lower part of the container casing 10 is increased, and Since the liquid level rises, the distance between the alcohol 2 floating on the liquid level and the suction port 6 increases. As a result, it becomes difficult for the circulation pump 4 to suck the alcohol 2, and the alcohol in the liquid refrigerant sprayed on the tube bundle 3 is reduced accordingly, so that the evaporation amount of the alcohol is reduced, and the evaporator and the condenser of the absorption refrigerator are condensed. There was a problem that the heat exchange performance of heat exchangers such as reactors and absorbers was reduced.

[0007]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above-mentioned problems, and the gist of the first invention is to provide a liquid in a liquid reservoir provided under a tube bundle. In an evaporator in an absorption refrigerating machine, the stored liquid refrigerant is sucked up together with alcohol on the surface of the liquid, sprayed on the tube bundle, and is evaporated by heat exchange with a cooling liquid circulating in the tube. An alcohol reservoir is formed by partitioning with the above, and a supply port for the liquid refrigerant containing alcohol transferred from the condenser is opened above the alcohol reservoir and the liquid refrigerant and the alcohol are sucked under the alcohol reservoir. It is in an evaporator in an absorption refrigerating machine characterized by having a mouth opened.

The gist of the second invention is that the liquid refrigerant stored in the liquid reservoir arranged in the lower portion of the tube bundle is sucked up together with the alcohol on the liquid surface thereof and is sprayed to the above-mentioned tube bundle to set the inside of the tube. In an evaporator in an absorption refrigerator that evaporates by exchanging heat with a circulating cooling liquid, the liquid reservoir is formed by a submerged weir made of a membrane that separates alcohol and liquid refrigerant from a capillary membrane, a semipermeable membrane, etc. To form an alcohol storage part, and to open a supply port of the liquid refrigerant containing alcohol transferred from the condenser to a liquid reservoir outside the alcohol storage part, and to connect the liquid refrigerant and the liquid refrigerant below the alcohol storage part. This is due to the opening of the alcohol inlet.

Another feature is that a circulation pump is connected to the suction port through the suction pipe.

Still another feature is that an eductor is connected to the suction port through the suction pipe, and a circulation pump is connected to the suction port which is opened below the liquid reservoir separately from the suction port. The discharge pipe of the circulation pump is connected to the driving liquid inlet of the eductor.

[0011]

In the first aspect of the present invention, since the liquid refrigerant containing alcohol transferred from the condenser is supplied to the alcohol reservoir through the supply port, the thickness of the alcohol layer in the alcohol reservoir increases. At the same time, the thickness of the liquid refrigerant is reduced. Therefore, the distance between the suction port and the alcohol layer becomes shorter, and the amount of alcohol that is sucked together with the liquid refrigerant into the suction port increases, so the amount of alcohol contained in the liquid refrigerant that is sprayed to the tube bundle also increases. To do.

In the second aspect of the present invention, the liquid refrigerant containing alcohol transferred from the condenser is supplied from the supply port to the liquid reservoir outside the alcohol reservoir, and floats above the liquid refrigerant due to the difference in specific gravity. Since only this alcohol permeates the membrane forming the submerged weir and enters the alcohol reservoir, the thickness of the alcohol layer in the alcohol reservoir increases and at the same time the thickness of the liquid refrigerant decreases.

According to the third aspect, the liquid refrigerant containing a large amount of alcohol is sucked into the circulation pump from the alcohol reservoir through the suction pipe, and is sprayed to the rear tube bundle which is urged there.

According to the present invention, when the liquid refrigerant in the lower portion of the liquid reservoir is sucked from the refrigerant suction port through the suction pipe into the circulation pump and is urged, and then supplied to the driving liquid inlet of the eductor,
The eductor is driven to suck the liquid refrigerant containing a large amount of alcohol from the alcohol storage portion into the eductor through the suction pipe and is sprayed on the tube bundle after being urged by the eductor.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. By partitioning the liquid reservoir 11 with a submerged weir 20, a small area alcohol reservoir 21 is formed. A supply port 5 for the liquid refrigerant containing alcohol transferred from the condenser is opened above the alcohol storage section 21, and the alcohol storage section is provided.
A suction port 22 is opened on the bottom plate of the device casing 10 below the device 21.

At the suction port 22, the circulation pump 4 is connected to the suction pipe 12
Connected through. Other configurations are similar to those of the conventional one shown in FIG. 4, and corresponding members are designated by the same reference numerals and the description thereof is omitted.

Thus, the liquid refrigerant containing alcohol transferred from the condenser is supplied from the supply port 5 to the alcohol storage section 21, and the liquid refrigerant passes under the submerged weir 20 and is stored outside the alcohol storage section 21. Alcohol that moves to 11 but floats on the liquid surface of the liquid refrigerant stays in the alcohol reservoir 21.
Therefore, the thickness of the alcohol layer 2 in the alcohol reservoir 21 increases and the thickness of the layer of the liquid refrigerant 1 decreases accordingly, so that the distance between the alcohol layer 2 and the suction port 22 becomes shorter.

Thus, when the circulation pump 4 is started, a large amount of alcohol 2 is sucked into the suction port 22 together with the liquid refrigerant from the alcohol storage portion 21, enters the circulation pump 4 through the suction pipe 12, and is energized here. After being sprayed through the pipe 13
It is sprinkled on the tube bundle 3 from 14. As a result, the amount of alcohol in the liquid refrigerant sprayed on the tube bundle 3 increases, and the evaporation amount of alcohol also increases, so the heat exchange performance of the heat exchanger of the absorption refrigerator increases, and therefore the absorption refrigerator's heat exchange performance increases. Performance is also improved.

FIG. 2 shows a second embodiment of the present invention. In the second embodiment, an eductor 24 is connected to the suction port 22 via a suction pipe 23. The circulation pump 4 is connected via a suction pipe 12 to a refrigerant suction port 25 provided under the liquid reservoir 11 separately from the suction port 22, and a discharge pipe 26 of the circulation pump 4 is a driving liquid inlet of an eductor 24. It is connected to 24A.

By driving the circulation pump 4, however, the liquid refrigerant in the lower portion of the liquid reservoir 11 is made into the refrigerant suction port 25 and the suction pipe 12.
After being sucked into the circulation pump 4 via the pump and energized, it is supplied to the driving liquid inlet 24A of the eductor 24 via the discharge pipe 26.
Then, the liquid refrigerant 1 and the alcohol 2 in the alcohol reservoir 21 are sucked into the eductor 24 via the suction port 22 and the suction pipe 23, and are sprayed from the sprayer 14 to the pipe bundle 3 via the pipe 13.

A third embodiment of the invention is shown in FIG. In the third embodiment, the submerged weir 20A is composed of a membrane such as a capillary membrane or a semipermeable membrane which separates alcohol from liquid refrigerant and allows only alcohol to permeate. Then, a liquid refrigerant supply port 5 containing alcohol transferred from the condenser is opened in the liquid reservoir 11 outside the alcohol reservoir 21.

Then, the liquid refrigerant containing alcohol transferred from the condenser is supplied to the liquid reservoir 11, and the alcohol 2 is separated from the liquid refrigerant 1 by the specific gravity difference and floats above the liquid refrigerant 1. Since this alcohol 2 has a small surface tension, a pressure difference is generated on both sides of the capillary membrane 20A by sucking the refrigerant from the lower part of the alcohol storage part 21, and only the alcohol 2 having a small surface tension enters the alcohol storage part 21 selectively. It is stored here. If a semipermeable membrane is used as the submerged weir 20A, the pressure difference between the two sides acts as a seepage pressure, and only the alcohol 2 permeates the semipermeable membrane and enters the alcohol reservoir 21.

Thus, the thickness of the alcohol layer 2 in the alcohol reservoir 21 is increased, the thickness of the liquid refrigerant layer 1 is reduced accordingly, and the distance between the alcohol layer 2 and the suction port 22 is shortened. The circulation pump 4 can suck a large amount of alcohol together with the liquid refrigerant.

The suction port 22 is connected to the eductor 24 via the suction pipe 23 in the same manner as shown in FIG. 2, and the alcohol reservoir 21 is driven by the eductor 24 driven by the liquid refrigerant sucked from the refrigerant suction port 25. The alcohol and the liquid refrigerant therein can be transferred to the sprayer 14.

[0025]

According to the first aspect of the invention, since the liquid refrigerant containing alcohol transferred from the condenser is supplied from the supply port to the alcohol storage section, the thickness of the alcohol layer in the alcohol storage section is increased and at the same time the liquid is cooled. The thickness of the refrigerant layer is reduced. Therefore, the distance between the suction port and the alcohol layer becomes shorter, and the amount of alcohol that is sucked together with the liquid refrigerant into the suction port increases, so the amount of alcohol contained in the liquid refrigerant that is sprayed to the tube bundle also increases. However, the amount of evaporation of alcohol also increases. As a result, the amount of refrigerant that can be enclosed in the absorption refrigerator can be increased without lowering the heat exchange performance of the heat exchanger of the absorption refrigerator, so that the capacity control range of the absorption refrigerator can be expanded.

In the second aspect of the invention, the liquid refrigerant containing alcohol transferred from the condenser is supplied from the supply port to the liquid reservoir outside the alcohol storage section, and only the alcohol floating above the liquid refrigerant due to the difference in specific gravity is submerged. Since it permeates through the membrane forming the weir and enters the alcohol storage portion, the thickness of the alcohol layer in the alcohol storage portion increases, and at the same time, the thickness of the liquid refrigerant decreases. Therefore, the same effect as that of the first invention can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing an evaporator in a conventional absorption refrigerator.

[Explanation of symbols]

 100 Evaporator 10 Container case 3 Tube bundle 11 Liquid reservoir 1 Liquid refrigerant 2 Alcohol 20 Submerged weir 21 Alcohol storage part 5 Supply port 22 Suction port 4 Circulation pump 12 Suction pipe 13 Piping 14 Sprinkler

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Toyofuku 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Takasago Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Ryo Fukushima 2-chome, Niihama, Arai-cho, Takasago-shi, Hyogo No. 1 Mitsubishi Heavy Industries, Ltd. Takasago Laboratory (72) Inventor Takashi Kobayashi 2-1-1 Shinhama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries Ltd. Takasago Works (72) Inventor Akihiro Kawada Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture 1-1-1 Mitsubishi Heavy Industries, Ltd. Takasago Plant (72) Inventor Kenzo Inoue 2-8-19 Niihama, Niihama, Arai-cho, Takasago-shi, Hyogo Takanishi Engineering Co., Ltd.

Claims (4)

[Claims] 1. A liquid refrigerant stored in a liquid reservoir arranged in the lower part of a tube bundle is sucked up together with alcohol on the liquid surface thereof, is sprayed to the tube bundle, and is heat-exchanged with a cooling liquid circulating in the tube. In an evaporator of an absorption refrigerating machine that evaporates, an alcohol reservoir is formed by partitioning the liquid reservoir with a submerged weir, and a supply port of a liquid refrigerant containing alcohol transferred from the condenser on the alcohol reservoir. And an intake port for the liquid refrigerant and alcohol below the alcohol storage section. 2. A liquid refrigerant stored in a liquid reservoir arranged in the lower portion of the tube bundle is sucked up together with alcohol on the liquid surface thereof, is sprayed to the tube bundle, and is heat-exchanged with a cooling liquid circulating in the tube. In an evaporator in an absorption refrigerating machine that evaporates by means of an evaporator, an alcohol reservoir is formed by partitioning the liquid reservoir with a submerged weir made of a membrane that separates alcohol from the liquid refrigerant and permeates only alcohol, such as a capillary membrane or a semipermeable membrane. A liquid refrigerant supply port for the liquid refrigerant containing alcohol to be transferred from the condenser is opened in the liquid reservoir outside the alcohol storage unit, and a suction port for the liquid refrigerant and alcohol is opened under the alcohol storage unit. An evaporator in an absorption refrigerating machine. 3. The evaporator in an absorption refrigerator according to claim 1, wherein a circulation pump is connected to the suction port via the suction pipe. 4. An eductor is connected to the suction port via the suction pipe, and a circulation pump is connected to the refrigerant suction port opened below the liquid reservoir separately from the suction port via the suction pipe. The evaporator in an absorption refrigerator according to claim 1 or 2, wherein a discharge pipe of a circulation pump is connected to a driving liquid inlet of the eductor.