JP3639338B2 - Absorption refrigerator absorber - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an absorber used for an absorption refrigerator.
[0002]
[Prior art]
FIG. 1 shows a conventional in-pipe absorption type absorber, which is disclosed in, for example, an absorption refrigerator of Japanese Patent Application No. 6-242128. In the same figure, the absorption liquid (lithium bromide-based aqueous solution) supplied to the upper part of the absorber 1 is cooled by the cooling medium outside the apparatus while flowing down the tube wall of the heat transfer tube 2, and the refrigerant vapor. It absorbs (water vapor) and becomes a dilute solution and is sent out from the bottom of the vessel 1 to the next step. The inner wall surface of the heat transfer tube 2 is densely engraved with a number of thin annular grooves to slow down the flow rate of the absorbent and to make the entire inner peripheral surface of the tube 2 wet with the absorbent. The gas-liquid contact time and contact area are made as large as possible.
[Problems to be solved by the invention]
In the above-described conventional configuration, the absorbing liquid flowing down the tube wall of the heat transfer tube 2 absorbs the refrigerant vapor while being cooled while in contact with the tube wall 2, but immediately after leaving the tube wall 2. It reached the bottom of the vessel 1 and was sucked by the pump 5 and sent to the regenerator in the next stroke. However, the inventor has experimentally confirmed that the portion other than the heat transfer tube 2 in the absorber 1 greatly contributes to absorption. FIG. 2 shows the contents of the experiment conducted using the absorber 1 of FIG. 1, from the lower end of the heat transfer tube 2 to the position of 10% of the length of the heat transfer tube 2 as shown in FIG. The absorption capacity when the absorption liquid is filled and the absorption capacity when the lower 10% portion of the heat transfer tube 2 is thermally insulated from touching the cooling medium as shown in FIG. According to this, in the case of (a), the absorption capacity is reduced by about 18%, and in the case of (b), it is reduced only by 4%. This result has shown that the lower space 1a (lower header part) of the absorber 1 has contributed greatly to absorption capacity.
[0004]
Further, the graph of FIG. 3 is obtained by measuring the cooling capacity and the absorption capacity in each case by heat insulation from the cooling medium with 0%, 5%, 10%, and 15% sequentially from the lower end of the heat transfer tube 2. In this graph, it is natural that the cooling capacity A decreases almost linearly, but when the heat insulation length is less than 6 to 7%, the absorption capacity curve B is saturated, and the space 1a at the bottom of the vessel body 1 is saturated. This suggests that the absorption capacity can be increased by about 10%. That is, in the conventional cooler, the cooling capacity is excessive as compared with the absorption capacity. In other words, the capacity of the absorber becomes excessive by the amount of the excessive cooling capacity, and the supercooled absorption liquid is sent to the regenerator. As a result, the thermal efficiency of the entire refrigerator is deteriorated. An object of the present invention is to improve such problems, to prevent wasteful consumption of the cooling capacity, and to reduce the size of the absorber or improve the absorption capacity.
[0005]
[Means for Solving the Problems]
As shown in FIG. 5 , the absorber of the absorption refrigerator according to the present invention is a vertical heat transfer tube for exchanging heat between the absorption liquid supplied to the upper part of the absorption absorber 1 in the tube and an external cooling medium. In the absorber of the absorption refrigerator, which flows down along the tube wall 2 and is sent out from the bottom 1a to the regenerator, a shelf-like gas- liquid contact filler 4 is placed in the lower space of the absorber 1. The filler 4 is formed by arranging a plurality of horizontal plates with a plurality of through-holes 6 at intervals in the vertical direction, and the absorbing liquid is once dropped onto the filler 4 from the heat transfer tube 2. It has a feature in the point made to let it be.
[0007]
【Example】
Figure 4 shows an absorption chiller tube within the absorption type. In-tube absorption type absorption refrigerator, after the absorption liquid supplied to the upper part of the absorber 1 flows down through the tube wall 2 of the vertical heat transfer tube that performs heat exchange with the cooling medium outside the device, it is filled is obtained by so as to vessel in contact lower further gas-liquid on a shelf-like plate 4 projecting from the wall surface 3 of the timber 4, for example a shelf-like filler 4 in Figure 4 from the side walls of the base 1 It consists of a plurality of horizontal plates 4 projecting alternately . FIG. 5 shows an example in which the present invention is applied to an absorption absorption refrigerator of a tube absorption type. In this case, the shelf-like filler 4 is a shelf stretched between both side walls as shown in FIG. those provided with a plurality of through holes 6 on the entire surface shaped for plate material 4, or as shown in FIG. (b), is composed of a plurality of plate-like filler 4 as racks erected on the bottom of Utsuwatai 1 Yes.
[0011]
【The invention's effect】
According to the present invention, as described above, by making the gas-liquid contact again on the filler 4 disposed in the lower part of the container, the supercooled absorption liquid remains in the absorption liquid before being discharged from the bottom. Since the refrigerant vapor is absorbed by effectively using the cold heat, the cold heat received from the heat transfer tube 2 can be used up completely, improving the absorption capacity and contributing to the downsizing of the apparatus and the improvement of the thermal efficiency. There is an advantage that you can.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a conventional example.
2A and 2B are longitudinal sectional views showing test states for explaining the principle of the present invention.
FIG. 3 is a graph showing the test results of the above.
FIG. 4 is a longitudinal sectional view of an example of an in- pipe absorption type absorption refrigerator .
5A and 5B are embodiments of the present invention, in which FIG. 5A is a cross-sectional view of a structural example of the main part of the same, and FIG. 5B is a cross-sectional view of another structural example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Absorber 1a Lower space 2 of an absorber 2 Heat transfer tube 3 Side wall 4 Filler 5 Pump 6 Through-hole

Claims (1)

The absorption liquid supplied to the upper part of the absorption absorber in the tube is allowed to flow down the wall of the vertical heat transfer tube that performs heat exchange with the cooling medium outside the device, and sent from the bottom to the regenerator. In the absorber of the absorption refrigerator, a shelf-shaped filler for gas- liquid contact is disposed in the lower space of the absorber, and a horizontal plate having a large number of through-holes is arranged vertically between the fillers. An absorber of an absorption refrigerator , which is formed by opening and arranging a plurality of the absorbents, and dropping the above-mentioned absorption liquid from a heat transfer tube onto a filler .

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