JP3171613B2 - Absorption refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigerator in which an absorbent and a refrigerant are contained in a decompression container.

[0002]

2. Description of the Related Art As shown in FIG. 1, this type of absorption refrigerator has an absorber 1, a regenerator 2, an evaporator 3 and a condenser 4, and these devices 1, 2, 3, 4 (For example, in the case of a single-body type, the four device parts 1, 2, 3, 4 are in a single container, and in the case of a twin-body type, the absorber 1 and the evaporator 3 In a common first container, and the regenerator 2 and the condenser 4 are incorporated in a common second container.), A cycle is formed between a dilute solution state and a concentrated solution state of the absorbent and the refrigerant, It is operated for cooling or the like. Here, the above-mentioned cycle is performed under a considerably low pressure state (several mmHg).
To several tens of mmHg). That is, when this state is described from the container side, the container of the absorption refrigerator is configured as a decompression container (vacuum container). By the way, such a container of the absorption refrigerator has an accident such as poor airtightness during operation, and difficulty in maintaining a vacuum due to corrosion of the container. When such an accident occurs, air enters the container,
The absorbent in the container exhibits strong corrosiveness to the components of the container in the presence of oxygen.

[0003]

Conventionally, when such an accident has occurred, a change in the temperature inside the apparatus, a change in the position of the liquid level in the container, and the like are detected, and the operation of the absorption refrigerator is stopped. They had to wait for repairs by the refrigerator manufacturer.
Here, even during this standby time, the above-described corrosion proceeds.
And this corrosion is not negligible depending on the waiting time. Therefore, an object of the present invention is to provide an absorption refrigerator that does not cause corrosion of the decompression container even when an accident occurs and the decompression container becomes airtight.

[0004]

In order to achieve this object, an absorption refrigerator according to the present invention is characterized in that it comprises an airtightness detecting means for detecting a decrease in the airtightness of the decompression container, and the airtightness by the airtightness detecting means. Is provided with a gas supply means for supplying a corrosion suppressing gas for suppressing the corrosion of the decompression vessel to the inside of the decompression vessel according to the decrease signal of the pressure drop. The operation and effect thereof are as follows.

[0005]

The absorption refrigerator has airtight detection means and gas supply means. When the hermeticity breaks, the hermeticity detecting means detects a decrease in hermeticity of the decompression container and sends a signal indicating a decrease in hermeticity to the gas supply means. When the gas supply means receives the signal, a corrosion inhibiting gas for suppressing corrosion of the decompression vessel is supplied into the decompression vessel. The supply of this corrosion-inhibiting gas is performed by external air (air) inside the container.
Is prevented from invading, and the above-mentioned progress of corrosion is avoided.

[0006]

As described above, an absorption refrigerating machine which does not corrode the container even when an accident occurs and the pressure reducing container becomes poorly sealed can be obtained.

[0007]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram of a single-effect absorption refrigerator. This system includes an absorber 1, a regenerator 2, an evaporator 3, and a condenser 4, and contains LiBr as an absorbent and water as a refrigerant. Then, the concentrated solution L1 in which the refrigerant is dissolved in the absorbent at a high concentration is generated in the regenerator 2 and transferred to the absorber 1, and the dilute solution L2 generated in the absorber 1 is returned to the regenerator 2. On the other hand, in the water w as a refrigerant, steam v moving from the regenerator 2 is condensed in the condenser 4 to become water w, which is sent to the evaporator 3 and evaporates to cool the heat transfer medium L3 and absorb the water w. It is configured to move to the vessel 1 and be absorbed by the absorbent. Here, the heat transfer medium L3 in a cooled state is circulated from the evaporator 3 to the air conditioner 5, and the air conditioner 5 performs a cooling operation. To be released.

Now, in this system, the absorber 1,
The evaporator 3 is set to a negative pressure state having substantially the same pressure, and the regenerator 2 and the condenser 4 are each maintained at a negative pressure state suitable for operation. These devices 1, 2, 3, and 4 are each housed in an appropriate decompression container 50 (for example, in the case of a single-body type, four devices 1, 2, 3, 4
Is a single container, and in the case of a twin-body type, the absorber 1 and the evaporator 3
And the regenerator 2 and the condenser 4 are built in a common second container. ).

Next, a description will be given of equipment relating to the characteristic structure of the absorption refrigerator of the present application. As shown, the absorber 1
Is provided with a pressure detector 7 as an airtightness detecting means for detecting the pressure of the absorber 1, and in conjunction with the pressure detector 7, it is determined that the airtightness of the part 1 has been reduced (airtightness of the container). If the airtightness is broken, the pressure in the absorber 1 rises from the pressure suitable for the predetermined operation.) Upon detection, the gas supply device 8 is provided as gas supply means that operates based on the detection information of the decrease in airtightness. Have been. In particular,
The gas supply device 8 includes a carbon dioxide gas cylinder 8a and a pipe 8b extending from the cylinder 8a to the absorber 1. Further, the pipe 8b includes an on-off valve 8c that is operated based on the above-described information indicating a decrease in airtightness. In the normal state, the on-off valve 8c is kept closed, and is opened according to the above-described information on the decrease in airtightness.

[0010] The operation accompanying the occurrence of the airtight breakage accident is described below. (1) Destruction of hermeticity (2) Detection of decrease in hermeticity by pressure detector 7 (3) Generation of decrease signal of hermeticity by pressure detector 7 (4) Carbon dioxide gas into container by gas supply device 8 Supply (5) Suppression of corrosion progress by suppressing air intrusion by carbon dioxide gas

As described above, in the absorption refrigerator of the present invention, even if airtight breakage occurs, the inside of the container is kept at a constant pressure, so that the intrusion of air (particularly oxygen) into the container is inhibited and absorption is performed. No corrosiveness to the container material is shown when mixed with the agent and the refrigerant. [Another Embodiment] Another embodiment of the present application will be described below. (B) Detection of airtightness reduction In the above-described embodiment, the detection of airtightness reduction was detected directly by the pressure detector 7 disposed in the corresponding portion. Is also possible. (A-1) A mechanism (for example, a float) for detecting the liquid level position of the solution or the refrigerant is provided in each device, and a change in the liquid level in a normal operation state and a state of reduced airtightness (airtightness) Is broken, the liquid level drops.). (A-2) As is employed in the operation stop operation of the conventional absorption type refrigerator by detecting abnormality, the temperature is detected by the temperature of the regenerator. Such a mechanism for detecting a decrease in the airtightness of the absorption refrigerator is referred to as airtightness detection means.

(B) Related to supplied gas In the above-described embodiment, an example of gas supplied from the gas supply device is carbon dioxide, but the following is also possible. (B-1) Nitrogen gas in compressed state (b-2) Freon used to identify leak points etc. after the occurrence of an accident (Generally, when an accident occurs, the repair worker replaces the inside of the container with nitrogen, The Freon is sent into the container and the leak location is identified by the Freon tester.Therefore, if Freon is supplied, the specified work can be performed promptly upon the arrival of the worker.) A gas that suppresses and suppresses corrosion of the container is referred to as a corrosion inhibiting gas.

(C) Further, in the above embodiment, the supply of gas in the absorber has been described. However, this supply is performed as shown by a two-dot chain line in FIG.
The gas supply device 8 may be provided for the condenser 4, the evaporator 3, and the corrosion inhibiting gas may be supplied to any part. Further, a configuration may be employed in which a plurality of detectors are provided to specify a site where a problem occurs, and the corrosion inhibiting gas is supplied only to the specified site. (D) The invention of the present application is applicable not only to the single-effect absorption refrigerator described in the embodiment but also to a multi-effect absorption refrigerator.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system configuration of an absorption refrigerator of the present application.

[Explanation of symbols]

 7 airtight detection means 8 gas supply means 50 decompression vessel

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-33584 (JP, A) JP-A-64-38575 (JP, A) JP-B-46-40074 (JP, B1) (58) Field (Int. Cl. ⁷ , DB name) F25B 15/00 306 F25B 49/04

Claims (1)

(57) [Claims] 1. An absorption refrigerator in which an absorbent and a refrigerant are stored in a decompression container (50), wherein an airtight detection means (7) for detecting a decrease in airtightness of the decompression container (50) is provided. A gas supply unit (8) for supplying a corrosion inhibiting gas for suppressing corrosion of the depressurized container (50) into the depressurized container (50) in response to a signal indicating a decrease in airtightness from the airtightness detecting unit (7). Equipped absorption refrigerator.