JPH0820146B2 - Absorption refrigerator extraction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention guides and guides a non-condensable gas in an evaporator and / or an absorber of a cold-temperature switching absorption refrigerator to a specific location by using an absorbing liquid. The present invention relates to improvement of a device for exhausting noncondensable gas by a vacuum pump.

(B) Prior art Conventionally, in the extraction device of the absorption refrigerating machine, JP-A-60-
As can be seen in Japanese Patent No. 196572, there is one that attempts to reduce the amount of refrigerant vapor generated when the absorbing liquid is ejected from the ejector by cooling the absorbing liquid before ejecting from the ejector with a cooler. .

(C) Problems to be Solved by the Invention However, in such a conventional bleeder for an absorption refrigerating machine, when the absorbing liquid before being ejected from the ejector is cooled, the absorbing liquid crystallizes if cooled too much. , It was sometimes impossible to bleed. Therefore, the absorption liquid cannot be sufficiently cooled, and the amount of refrigerant vapor generated when the absorption liquid is ejected from the ejector cannot be sufficiently reduced. Therefore, the extraction device of the absorption refrigerating machine cannot fully exhibit its ability.

The present invention has been made in view of the above-described problems of the prior art, and provides an extraction device for an absorption refrigerator that can sufficiently exhibit its capability.

(D) Means for solving the problem When using the same exhaust pump as the conventional one for discharging the non-condensable gas accumulated in the extraction chamber to the outside of the absorption refrigerator,
If the time, the number of discharges, and the volume of the non-condensable gas to be discharged are the same, the non-condensable gas with a lower temperature has a larger number of moles (Avogadro number) than the non-condensable gas with a higher temperature. It is advisable to discharge the gas outside the absorption refrigerator.

In order to solve the problems of the prior art using the above method, the present invention provides a heat exchanger for exchanging heat between the gas in the extraction pipe and the cold water or the refrigerant cooled by the evaporator in the middle of the extraction pipe. It was done.

(E) Action The extraction apparatus for the absorption refrigerator according to the present invention cools the non-condensed gas with the cold water or the refrigerant passing through the heat exchanger arranged in the extraction tube. The number of moles of the cooled non-condensable gas increases under the condition of the same volume and the same pressure.
The extraction device of the absorption refrigerator according to the present invention discharges this non-condensed gas to the outside of the absorption refrigerator.

(F) Embodiment FIG. 1 is an embodiment of an extraction device for an absorption refrigerator according to the present invention. First, the structure will be described.

(1) is a heat exchanger for exchanging heat between combustion gas and absorbing liquid, (2) and (3) are high temperature and low temperature generators, (4) is a condenser, (5) is an evaporator, (6) Is an absorber, (7),
(8) is a refrigerant and absorption liquid pump.

(9) is a refrigerant pipe that guides the refrigerant of the condenser (4) to the evaporator (5), (10) is a refrigerant circulation path, and (11) is rare absorption that guides the rare absorption liquid to the high temperature generator (2). A liquid pipe, (12) an intermediate liquid storage chamber communicating with the high temperature generator (2), and (13) a liquid level in the intermediate liquid storage chamber (12) Float valve, which controls the flow rate of the rare absorption liquid of (14)
Is an intermediate liquid pipe that guides the intermediate liquid from the intermediate liquid storage chamber (12) to the low temperature generator (3), and (15) is a concentrated absorption liquid that guides the concentrated absorption liquid from the low temperature generator (3) to the absorber (6). The liquid pipe, (16), is a pipe for guiding the refrigerant vapor from the high temperature generator (2) to the condenser (4) via the low temperature generator (3).

(17) is a chiller for the evaporator (5), which is connected to a load side heat exchanger (not shown) by chilled water pipes (18) (19) having a chilled water pump (not shown). A chilled water circuit is constituted, and (20) and (21) are a cooler for the absorber (6) and a cooler for the condenser (4), which are cooling water pipes (not shown) having cooling water pumps (not shown). 22), (23) and (24) are connected to a cooling tower (not shown).

(25) is an extraction pipe that guides the non-condensed gas from the absorber (6) to the extraction chamber (26), and (27) guides the rare absorption liquid into the container (28) from the middle of the rare absorption liquid pipe (11). A pipe, (29) is a gas-liquid separation chamber, (30) is a collection chamber, and (31) is a pipe for guiding the absorption liquid from the lower portion of the container (28) to the absorber (6). (32) is a pipe for guiding the non-condensable gas from the collection chamber (30) to the oil trap (33), (34) is an exhaust pump for discharging the non-condensable gas to the outside of the machine, and (35) is the oil trap (33). ) And the exhaust pump (34).

(36) is a heat exchanger disposed in the middle of the extraction pipe (25), (37) is a pipe connecting the heat exchanger (36) and the refrigerant circulation path (10), and (38) is heat exchange. It is a pipe connecting the vessel (36) and the evaporator (5).

Next, the operation of the extraction device (hereinafter referred to as the present device) of the absorption refrigerator having the above-described configuration will be described.

When the absorption refrigerator equipped with this device is operated, the refrigerant liquid is sprayed to the water cooler (17). This refrigerant liquid takes the latent heat of the cold water in the water cooler (17) and evaporates at about 5 ° C. to become refrigerant vapor. Since the absorbing liquid is sprayed to the cooler (20), it absorbs the refrigerant vapor. The temperature of the absorbing liquid at this time is about 40 ° C
Therefore, the temperatures of the refrigerant vapor and the non-condensable gas in the absorber (5) are also about 40 ° C. Due to the ejector action of the absorbing liquid injected from the pipe (27) at the discharge pressure of the absorbing liquid pump (8), the refrigerant vapor and the non-condensed gas in the absorber (6) pass through the extracting pipe (25) to the extraction chamber (26). ) Is aspirated to. The sucked refrigerant vapor is absorbed by the jetted absorption liquid, and this absorption liquid flows down through the container (28) and the gas-liquid separation chamber (29) and the pipe (3
Return to the absorber (6) via 1). Further, the non-condensed gas becomes bubbles and flows down the container (28) together with the absorbing liquid and returns to the gas-liquid separation chamber (29), and the non-condensed gas reaching the gas-liquid separation chamber floats and rises to the collection chamber ( 30). Then, when a predetermined amount of the non-condensable gas stored in the collection chamber (30) is accumulated, the non-condensed gas is passed through the pipes (32), (35) and the oil trap (33) to the outside of the absorption refrigerator by the exhaust pump (34). Is discharged.

Here, the non-condensable gas and the refrigerant vapor are transferred to the heat exchanger (36).
When cooled by the refrigerant liquid therein, the temperature drops from about 40 ° C to about 5 ° C. Where the gas equation of state PV = nRT (R
Is a gas constant), and if pressure and volume are constant, n = (PV / R)
From the equation / T, the number n of moles of gas is inversely proportional to the absolute temperature T.
When the temperature of the non-condensable gas changes from T = 313 (K) [40 ° C.] to T ′ = 278 (K) [5 ° C.], the number of moles R′≈1.1
3 and the mole number R'increases by about 13%. Therefore, the number of moles of the non-condensable gas stored in the collection chamber (30) in the same volume as that of the conventional extraction device is increased by about 13%. This collection room (3
The non-condensable gas stored in (0) is exhaust pump (34).
Is discharged to the outside of the absorption refrigerator. At this time, since the non-condensable gas is increasing in volume by about 13% in the same volume, the absorption refrigerator equipped with this device may discharge the non-condensable gas with about 13% more mol number than the conventional device. it can.

In addition, a pipe (39) connecting the pipe (18) and the heat exchanger (36) and a pipe (40) connecting the pipe (19) and the heat exchanger (36) are provided, and the non-condensed gas is cooled with cold water. Of course, it may be cooled.

(G) Effect of the invention The extraction device of the absorption refrigerating machine according to the present invention is a non-condensable gas discharged into the extraction chamber, cooled by cold water or a refrigerant in the middle of the extraction pipe leading to the extraction chamber, and the number of moles under the same volume and pressure conditions And then the noncondensable gas is discharged by an exhaust pump. Therefore, even when the same volume of non-condensed gas is discharged using the same exhaust pump as that used conventionally,
It is possible to discharge a larger number of moles of non-condensed gas than the conventional one to the outside of the machine.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory view of an extraction device for an absorption refrigerator according to the present invention. (6) …… Absorber, (18), (19) …… Cold water pipe, (25)
…… Bleed pipe, (27) …… pipe, (30) …… collection chamber, (35)
...... Exhaust pump, (36) …… Heat exchanger, (37), (38)
... tube, (39), (40) ... tube.

Claims (1)

[Claims] 1. An extraction apparatus for an absorption refrigerating machine, which comprises a refrigeration cycle in which a generator, a condenser, an evaporator, and an absorber are connected by piping, and which has an extraction pipe for introducing a non-condensable gas into an extraction chamber. 2. A bleed device for an absorption refrigerating machine, wherein a heat exchanger for exchanging heat between the gas in the bleed pipe and the cold water or the refrigerant cooled by the evaporator is disposed in the middle of the bleed pipe.