JPS61262566A - Absorption type refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an absorption refrigerating machine, specifically a generator, and a gas-liquid separator disposed above the generator to separate refrigerant vapor and absorption liquid. and a liquid lift pipe extending from the generator to the gas-liquid separator, and a downcomer pipe for returning excess absorption liquid from the absorption liquid from which refrigerant vapor has been separated in the gas-liquid separator to the generator. Regarding absorption refrigerators.

(Prior Art) A conventional refrigerator of this type is described in, for example, Japanese Patent Laid-Open No. 13967/1983.

Briefly explained based on Fig. 3, this is a dual-effect absorption refrigerator, from the absorber (a) to the high temperature generator (1).
) for returning the low concentration dilute absorbent to the downcomer tube ( 6) is connected near the generator (1) so that the dilute absorption liquid is returned to the generator (1) together with the intermediate concentration absorption liquid flowing through the downcomer pipe (θ).

In the figure, (b) is the low temperature generator, and (3) is the generator (
(C) a liquid lift pipe extending from 1) to the gas-liquid separator (2);
is a condenser, (d) is an evaporator, and (5) is the gas-liquid separator (
2) is a first solution tube that leads an intermediate concentration absorption liquid from the low temperature generator (b); (e) is a second solution tube that supplies a high concentration absorption liquid from the low temperature generator to the absorber (a); , (f
) and (g) are for heat exchange between the dilute absorption liquid flowing through the dilute solution tube (10) and the absorption liquid flowing through the first and second solution tubes (5) and (e), respectively. It is a heat exchanger.

(Problems to be Solved by the Invention) By the way, there is a large temperature difference between the intermediate concentration absorbing liquid flowing down the downcomer pipe (6) and the dilute absorbing liquid flowing into the downcomer pipe (6). Because of the difference in concentration and concentration, it is difficult for these absorbent liquids to be mixed uniformly. Despite this,
In the conventional method described above, (1) the dilute absorption liquid is passed through the downcomer pipe (
8) is directly merged with the excess absorption liquid flowing down in the downcomer pipe (6), and Because the path length (path length) was extremely short, the absorbed liquids that merged in the downcomer pipe (6) were not mixed uniformly and flowed into the high temperature generator (1) in a non-uniform manner. As a result, large temperature and concentration variations occur in the absorbent liquid in the generator (1), which may reduce the thermal efficiency of the generator (1) or cause severe damage due to local heating. There was a problem.

Therefore, the object of the present invention is to mix in advance the diluted absorption liquid to be returned to the generator and the excess absorption liquid generated in the gas-liquid separator, and then utilize the golden conduit of the downcomer pipe for growth. The absorbent liquids are mixed more uniformly while flowing down the downcomer pipe, and the temperature and concentration unevenness of the absorbent liquid returned to the generator is reduced. The object of the present invention is to improve the thermal efficiency of the generator and to reduce damage to the generator.

(Means for Solving the Problems) The present invention will be explained based on FIG. a gas-liquid separator (2), a liquid pumping pipe (3) extending from the generator (1) to the gas-liquid separator (2), and a gas-liquid separator (2) that removes excess absorption liquid from the absorption liquid from which refrigerant vapor has been separated. In an absorption refrigerator equipped with a downcomer pipe (6) that returns the liquid to the absorber (1), the excess absorbent liquid and the dilute absorbent liquid returned from the absorber are introduced into the gas-liquid separator (2). A mixing chamber (C) was provided, and the inflow side of the downcomer pipe (6) was connected to the mixing chamber (C).

(Function) Therefore, in the mixing chamber (C), the generator (1
) The dilute absorbent liquid to be returned to the gas-liquid separator (2) is mixed in advance with the surplus absorbent liquid generated in the gas-liquid separator (2), and the mixed absorbent liquid is added to the downcomer pipe (6). During this time, the absorption liquids are sufficiently mixed, and the absorption liquid with smaller temperature and concentration unevenness can be returned to the generator (1).
) The temperature unevenness and temperature unevenness of the absorbing liquid within ) can also be made smaller than in the past.

(Example) The one shown in Figure 1 is part of a dual-effect absorption refrigerator, in which a gas-liquid separator (2) is installed above a high-temperature generator (1). The separator (2) and the generator (1) are connected by a lift pipe (3) which allows a mixed flow of intermediate concentration absorption liquid and refrigerant vapor to flow from the generator (1) to the separator (2). In addition, the gas-liquid separator (2) is connected to the liquid pumping pipe (3).
a refrigerant vapor pipe (4) for discharging the refrigerant vapor separated from said mixed stream entering from said mixed stream through a low temperature generator (not shown) to a condenser (not shown); A solution pipe (5) is connected to which the intermediate concentration absorbent is led out to the low temperature generator, while a dropper is connected to the solution pipe (5) which leads the intermediate concentration absorbent to the high temperature generator (1). A liquid pipe (6) is connected.

The generator (1) has a casing (1a) having a substantially circular cross section.
A combustion chamber (1b) having a substantially circular cross section is provided in the lower part of the interior, and a heat exhaust pipe (1c) for circulating combustion gas is provided in the upper part, and the outflow side of the downcomer pipe (6) is connected to the casing ( 1a) is connected to the lower end of the downcomer pipe (
The absorption liquid flowing into the generator (1) from 6) rises along the wall surface of the combustion chamber (1b).

The gas-liquid separator (2) includes an introduction chamber (A) which mainly functions to separate the mixed flow introduced from the liquid pumping pipe (3) into refrigerant vapor and intermediate concentration absorption liquid; A storage section (B) for storing absorbent liquid, a mixing chamber CC for introducing surplus absorbent liquid generated in the storage section (B) and diluted absorbent liquid returned from the absorber>, and the introduction chamber (A). a discharge chamber (for which the refrigerant vapor separated in the
D).

Specifically, the gas-liquid separator (2) consists of a box-shaped casing in which the bottom wall (21) is formed into a step-like shape by a high-stage side bottom wall (21a) and a low-stage side bottom wall (21b). The liquid pumping pipe (3) is connected in a protruding manner to the high stage side bottom wall (21a), and the refrigerant vapor pipe (4) is connected to the side wall ( A partition plate (7) that connects to the upper part of the refrigerant vapor pipe (4) and the liquid pumping pipe (3) in a continuous manner is suspended from the ceiling wall (21d), and thus, The interior of the casing is divided into the outlet chamber (D) and the introduction chamber (A) on the left and right with the partition plate (7) as a boundary.

Further, a weir (8) is provided at the boundary between the high stage side bottom wall (21a) and the low stage side bottom wall (2l b), and the introduction chamber (A) is provided at the high stage side bottom wall (21a). ), forming the storage section (B) for storing the intermediate concentration absorption liquid separated in the storage section (B), and supplying the intermediate concentration absorption liquid to the low temperature generator on the bottom wall (21a) of the storage section (B). Pipe (5
) are connected.

Further? 2. The lower side bottom wall (21b) and the side wall (21c)
) and a vertical wall (21e) to form the mixing chamber (C), and an absorber located below the position of the gas-liquid separator (2) on the side wall (21c) of the mixing chamber (C). A dilute solution tube (10
) to allow the dilute absorption liquid to flow into the mixing M (C) from the dilute solution tube (10), and to drain the excess intermediate concentration absorption liquid generated in the storage section (B) into the weir. (8
) to allow overflow and inflow.

Further, at the end of the dilute solution tube (10), there is a flow ff inside.
i A discharge nozzle (10b) having a control valve (10a) is attached, and this control valve (10a) is connected to a float (10C) floating on the liquid level of the mixing chamber (C). C) The control valve (10a) is opened and closed by vertical movement of the float (10c) according to the amount of liquid in the liquid in the mixing chamber (C). The amount of absorbed liquid is adjusted so that the amount of liquid in the mixing chamber (C) can always be maintained at a constant level so that the liquid does not flow back toward the storage section (B).

Further, (4a) is a baffle body for preventing the absorption liquid in a mist form from flowing out from the refrigerant vapor pipe (4).

The action will be explained below.

A mixed flow of intermediate concentration absorption liquid and refrigerant vapor that has flowed from the generator (1) through the liquid pumping pipe (3) into the introduction chamber (A) is separated in the introduction chamber (A), and The absorption liquid flows down into the storage part (B), and the required amount of absorption liquid to be supplied to the absorber is determined by the solution tube.

(5), while other excess absorbent liquid overflows from the weir (8) and flows down into the mixing chamber (C).

At the same time, the discharge nozzle (1) of the dilute solution tube (10)
0b), the dilute absorption liquid flows into the mixing chamber (C),
The dilute absorption liquid and the intermediate concentration absorption liquid are mixed in this mixing chamber (C).

Moreover, since the intermediate TF5 storage absorbent liquid and the diluted absorbent liquid flow directly into the absorbent liquid remaining in the mixing chamber (C) with a head difference, the remaining absorbent liquid is well stirred.
These absorption liquids are well mixed.

Furthermore, the absorption liquid mixed in the mixing chamber (C) is returned to the generator (1) through the metal conduit of the downcomer pipe (6). The downcomer (
6) Because they flow down in a turbulent manner, the intermediate concentration absorption liquid and the dilute absorption liquid are mixed more uniformly during this flow process as well.

Therefore, the absorption liquid is mixed uniformly, and the generator (1) is in a state where the temperature unevenness and concentration unevenness are almost eliminated.
It flows in from the lower end of the .

and the casing (1a) in the generator (1).
) and the combustion chamber (1b).
1b) and is heated and concentrated.

Moreover, as mentioned above, from the generator (1) to the liquid lift pipe (3)
The excess absorption liquid of the mixed flow introduced into the introduction chamber (A) through the weir (8) overflows into the mixing chamber (C).
), while replenishing from the discharge nozzle (10b) of the dilute solution tube (10) in an amount corresponding to the amount of refrigerant vapor and the amount of intermediate concentration absorption liquid flowing out from the solution tube (5). , the amount of liquid circulating through the self-circulation circuit formed by the generator (1), liquid lift pipe (3), gas-liquid separator (2), mixing chamber (C), and downcomer pipe (6) is increased. It becomes possible to do so.

As a result, even if the passage between the inner wall of the casing (1a) of the generator (1) and the outer wall of the combustion chamber (1b) is narrowed, the forced convection effect promotes the circulation of refrigerant vapor bubbles, and the generator (1) ) The amount of solution stored in the container can be greatly reduced, resulting in cost reduction.

Furthermore, since there is almost no temperature unevenness in the absorption liquid flowing into the generator (1), the temperature and concentration of the absorption liquid in the generator (j,) become more uniform, and the convection of the absorption liquid increases. Heat transfer is promoted, thermal efficiency is improved, damage caused by local heating can be prevented, and durability and safety can be improved.

Further, the tip of the dilute solution tube (10) is connected to the mixing chamber (C).
Since the opening is open to There's nothing to do.

On the other hand, the introduction chamber (A) in the gas-liquid separator (2)
The refrigerant vapor separated by flows out into the outlet chamber (D) from the outlet (7a) below the partition plate 7), and after removing the absorption liquid mist by the baffle body (4a), (4) and flows out to the condenser.

Another embodiment shown in FIG.
A partition body (14) is provided for dividing the lower stage side bottom wall (2l b) side portion into an upper part of the outlet chamber (D) and a lower part of the separate chamber (13). ), a weir (15) is installed to partition the separate chamber (13) into left and right sides, thereby forming a storage section (B) for intermediate concentration absorbent and a mixing chamber (C).

and the storage section (B) in the partition body (14).
In the opposing part, there is an opening ( 14a) is provided.

When doing so, the storage section (
The excess absorption liquid of B) flows down and also flows into the dilute solution tube (10
Even if the surface of the absorption liquid remaining in the mixing chamber (C) becomes foamy when flowing down from the mixing chamber (C) and a large amount of mist is generated, this mist is blocked by the partition (14) and flows into the discharge chamber (CD).
As shown in FIG.
It is also possible to omit step a).

Although the above embodiments have all been described with respect to a double-effect absorption refrigerator, the present invention can also be applied to a single-effect absorption refrigerator.

(Effects of the Invention) As explained above, in the absorption refrigerator of the present invention, the excess absorption liquid in the gas-liquid separator (2) and the rare liquid returned from the absorber are sent to the gas-liquid separator (2). A mixing chamber (C) into which the absorbent liquid is introduced is provided, and the excess absorbent liquid and the diluted absorbent liquid are mixed in advance in the mixing chamber (C), and a downcomer pipe (6) is connected to the mixing chamber (C). ), the temperature and concentration of the absorption liquid in the generator (1) can be made more uniform, and as a result, the thermal efficiency of the generator (1) can be improved. At the same time, it can reduce the damage (
This made it possible to improve durability and safety.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of the main parts of an absorption chiller according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of the main parts of another embodiment, and FIG. 3 is a cross-sectional explanatory diagram showing a conventional example. It is. (1) ... Generator (high temperature generator) (2) ... Gas-liquid separator (3) ... Lifting pipe (6), e, downcomer pipe (C) ... Mixing chamber No. a figure

Claims (1)

[Claims] (1) a generator (1); a gas-liquid separator (2) disposed above the generator (1) to separate refrigerant vapor and absorption liquid; Absorption type refrigeration comprising a lift pipe (3) extending to a separator (2) and a downcomer pipe (6) that returns excess absorption liquid from the absorption liquid from which refrigerant vapor has been separated to the generator (1). In the machine, the gas-liquid separator (2) includes:
A mixing chamber (C) is provided for introducing the surplus absorption liquid and the dilute absorption liquid returned from the absorber, and the inflow side of the downcomer pipe (6) is connected to the mixing chamber (C). absorption refrigerator.