JPH10246534A - Absorption freezing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable refrigerant to be sprayed in a stable manner even under an inclined state at a low cost and without producing any clogging of dusts or the like by a method wherein a refrigerant spraying device for use in spraying refrigerant liquid is made of integral molded product of synthetic resin. SOLUTION: A refrigerant spraying device in an absorption freezing device is constituted such that a refrigerant dispersion device 13 is comprises of an integral molded product made of synthetic resin including a main refrigerant passage to which refrigerant liquid is supplied; a plurality of branch passages 25, 25... branched from the main refrigerant passage 24; and refrigerant liquid dripping nozzles 26, 26 formed at the extremity end of each of the branch passages 25 in a downward direction. Dusts or the like present in the refrigerant liquid having a larger specific weight than that of the refrigerant liquid are settled and accumulated in the main refrigerant passage 24 and the branch passages 25, 25... during a process in which the refrigerant (d) supplied to the main refrigerant passage 24 is dripped from the nozzle sections 26, 26... through the branch passages 25, 25... onto the evaporating heat transfer pipes 21, 21....

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption refrigeration apparatus, and more particularly, to a structure of a refrigerant distribution apparatus attached to an evaporator in an absorption refrigeration apparatus.

[0002]

2. Description of the Related Art Generally, an absorption refrigerating apparatus includes an evaporator in which a heat source-side refrigerant (for example, condensed water) evaporates outside a tube and a utilization-side refrigerant (for example, Freon) condenses in a tube. In the evaporator, it is important to uniformly disperse the heat source-side refrigerant on the outer periphery of the heat transfer tube through which the use-side refrigerant circulates in the tube, in order to improve the performance as the evaporator.

[0003] As a method of spraying the above-mentioned refrigerant, conventionally,
"Spray with a small nozzle like a spray. Spray with a combination of stainless steel gutters.
Spraying is performed by forming a thin channel by combining stainless steel bending plates. "Has been adopted.

However, in the case of the above method, for example, in the method described above, "(a) the probability that the sprayed refrigerant uniformly hits the heat transfer tube is low. (C) Long-term reliability due to being movable. (D) The range that can be sprayed with a single nozzle is limited, and a large number of nozzles are required. " As the cost increases. Also,
According to the methods of (1) and (2), bending and welding of stainless steel members increase the cost and make it difficult to provide them cheaply. (B) When the number of heat transfer tubes increases in four rows and six rows, additional parts are required. Is required, and it is necessary to increase the assembling accuracy in order to perform equal distribution. As a result, the cost increases. "

Further, as disclosed in Japanese Patent Application Laid-Open No. 6-2989, the outside of a spray duct having a plurality of liquid distribution orifices is wrapped with a plurality of net members (for example, wire netting), and the end of the net member is wrapped around the duct. There has been proposed an apparatus in which a fin portion is formed by hanging the portion downward, and the refrigerant is dropped from the fin portion to the outer periphery of the heat transfer tube.

[0006]

However, even in the case of the above-mentioned known example, there is a problem that the increase in the number of parts and the complexity of the structure cannot be avoided, and the assembling accuracy is also required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has a low cost and no clogging due to the fact that a refrigerant spraying device for spraying a refrigerant liquid is constituted by an integrally molded product of a synthetic resin. It is an object of the present invention to provide a refrigerant spraying device which does not require a very high assembling accuracy and can stably spray the refrigerant even when inclined.

[0008]

According to the basic structure of the present invention, as a means for solving the above problems, a regenerator 1,
The refrigerant circulates in the order of the condenser 9, the evaporator 12 and the absorber 15, and the refrigerant dispersing device 13 for dispersing the refrigerant liquid to the evaporating heat transfer tubes 21, 21.
In the absorption refrigeration apparatus provided with
3 is divided into a main refrigerant passage 24 to which the refrigerant liquid d transferred from the condenser 9 is supplied, a plurality of branch passages 25 branching from the main refrigerant passage 24, and a tip of each of the branch passages 25. Nozzle part 2 for lowering refrigerant droplets formed downward on the part
6 and 26 are formed as an integral molded product of a synthetic resin.

With the above construction, the refrigerant liquid d supplied to the main refrigerant passage 24 is supplied to the branch passages 25, 25.
.. through the nozzles 26, 26,.
1, 21,..., And dust having a higher specific gravity than the refrigerant liquid d existing in the refrigerant liquid d is removed from the main refrigerant passage 2.
4 and the branch passages 25, 25,... Therefore, the nozzle portions 26, 26
The risk of non-uniform spraying due to clogging is reduced. Further, the main refrigerant passage 24 and the branch passages 25, 2
5 and the nozzles 26, 26 are formed as an integral molded product, so that a very high assembling accuracy is not required, and even if the apparatus is slightly inclined, all the nozzles 26, 26
・ Even if the inlet is not exposed from the liquid level, uniform spraying can be performed. Furthermore, since it is constituted by a synthetic resin integrally molded product, the cost is reduced and the heat transfer tube 2 for evaporation is reduced.
.. Can be easily coped with simply by changing the mold.

In the basic configuration of the present invention, when the main refrigerant passage 24 and the branch passages 25, 25,... Are communicated via the throttle passages 28, 28,.
, The refrigerant liquid d can be equally distributed to the branch passages 25, 25,.
This makes it possible to more evenly and evenly distribute the refrigerant liquid d from the nozzles 26, 26,....

Each of the branch passages 25 includes a first passage 29 communicating with the main refrigerant passage 24, and a second passage 30 having a bottom surface higher than the first passage 29 and communicating with the nozzle portion 26. In this case, the sedimentation and retention of dust and the like having a higher specific gravity than the refrigerant liquid d is promoted also in the branch passage 25, and the prevention of clogging in the nozzle portions 26, 26,.

Further, when the raised portion 32 is formed integrally with the entrance edge of each of the nozzle portions 26, dust reaching the vicinity of the entrance edge of the nozzle portion 26 can be prevented from flowing into the nozzle portion 26. Thus, the prevention of clogging in the nozzle portion 26 is further ensured.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First, a refrigeration system in an absorption refrigeration system which is common in the following embodiments will be described with reference to FIG.

In this absorption refrigerating apparatus, for example, an aqueous solution of lithium bromide (aqueous solution of LiBr) is used as the absorbing liquid, and steam is used as the heat source side refrigerant (the liquid to be absorbed).

In FIG. 1, reference numeral 1 denotes a high-temperature regenerator provided with a heating source 2 such as a gas burner. Above the high-temperature regenerator 1, a gas-liquid separator 4 communicated via a boiling gas-liquid passage 3 is provided. In the high-temperature regenerator 1, the lithium bromide dilute solution c is heated and boiled and supplied to the gas-liquid separator 4 located above through the boiling gas-liquid passage 3, where the water vapor a and the absorbing liquid b ( That is, it is separated and regenerated with a lithium bromide concentrated solution).

The lithium bromide dilute solution c is obtained by absorbing water d as a refrigerant into a lithium bromide concentrated solution b as an absorbing solution in an absorber 15 described in detail below. It is preheated through the high-temperature solution heat exchanger 7, supplied to the gas-liquid separator 4, and then returned to the high-temperature regenerator 1.

In the gas-liquid separator 4, a use-side refrigerant (for example, R407C) circulating in a secondary cycle X including a use-side heat exchanger 17, which will be described in detail later, and steam after the gas-liquid separation. a (in other words, a heat-source-side refrigerant) exchanges heat with a heat heat exchanger 5 serving as a heat source during a heating operation, and steam a after heat exchange with the heat heat exchanger 5 becomes The condensed refrigerant liquid d (that is, condensed water) sent to the low-temperature regenerator 6 and condensed is returned to the high-temperature regenerator 1. Further, the concentrated lithium bromide solution b separated in the gas-liquid separator 4 is supplied to the low-temperature regenerator 6 after heat exchange with the dilute lithium bromide solution c in the high-temperature solution heat exchanger 7. . Reference numeral 8 denotes an exhaust gas passage for discharging exhaust gas.

In the low-temperature regenerator 6, the steam a supplied from the gas-liquid separator 4 and the lithium bromide concentrated solution b are subjected to heat exchange, thereby condensing the steam a and the lithium bromide concentrated solution b. The remaining water contained in the evaporator is evaporated to obtain a higher concentration lithium bromide solution.

The water vapor e evaporated from the lithium bromide concentrated solution b in the low temperature regenerator 6 is sent to an air-cooled condenser 9 where it is condensed and liquefied to become condensed water d and a refrigerant tank 10
It is stored in. The condensed water d condensed and liquefied in the low-temperature regenerator 6 is also stored in the refrigerant tank 10.

The condensed water d stored in the refrigerant tank 10
Is the refrigerant spraying device 1 of the evaporator 12 by the refrigerant pump 11
3. The concentrated lithium bromide solution b taken out of the low-temperature regenerator 6 is heat-exchanged with the dilute lithium bromide solution c in the low-temperature solution heat exchanger 14, and then the absorption liquid distribution container of the air-cooled absorber 15 is used. 16.

The evaporator 12 includes a use-side refrigerant (for example, a use-side refrigerant circulating in the secondary cycle X including the use-side heat exchanger 17).
R407C) and heat exchange between condensed water d, which is a heat-source-side refrigerant sent from the refrigerant tank 10, and serves as a cold heat source during cooling operation.

Then, the dilute lithium bromide solution c taken out of the absorber 15 is passed through the low-temperature solution heat exchanger 14 and the high-temperature solution heat exchanger 7 by the solution pump 18 to the gas-liquid separator 6 as described above. Will be returned.

The absorber 15 includes a plurality of absorption heat transfer tubes 19 through which the absorption liquid b flows vertically, and radiation fins 2 provided on the outer peripheral portion of the absorption heat transfer tubes 19.
., And an absorption liquid distribution container 16 provided above the absorption heat transfer tubes 19, 19,... For distributing the absorption liquid b to the absorption heat transfer tubes 19, 19,. ing. The evaporator 12 and the evaporating heat transfer tubes 21,
A refrigerant dispersing device 13 for supplying condensed water d, which is a refrigerant liquid, is built in the outer periphery of 21.

The evaporator 12 is provided with evaporative heat transfer tubes 21, 21... Through which the use-side refrigerant circulating in the secondary cycle X including the use-side heat exchanger 17 flows as described above. The evaporating heat transfer tubes 21, 21,... Are arranged so as to form a horizontal multistage of six rows. Reference numeral 22 denotes a refrigerant liquid d which has not been evaporated in the evaporator 12 and the refrigerant pump 11
A refrigerant recovery circuit 23 for returning the refrigerant to the upstream side is a liquid storage part for storing the lithium bromide dilute solution c obtained by absorbing the water vapor a in the absorber 15.

Next, the absorption refrigeration apparatus according to each embodiment will be described in detail below.

First Embodiment FIGS. 2 to 5 show a refrigerant dispersing apparatus in an air-cooled absorption refrigeration apparatus according to a first embodiment of the present invention.

The refrigerant distribution device 13 includes a main refrigerant passage 24 to which the condensed water d from the condenser 9 is supplied, and a plurality of branch passages 25 branching from the main refrigerant passage 24.
, Formed at the tip of each of the branch passages 25, and formed integrally with a synthetic resin. Reference numeral 27 denotes a condensed water introduction pipe.

The main refrigerant passage 24 is provided in the refrigerant distribution device 13
Is formed in a gutter shape extending linearly from a connection portion of the condensed water introduction pipe 27 at a central portion thereof, and gutter-shaped branch passages 25 are formed at predetermined intervals from both sides thereof. The wall surface 2 of the main refrigerant passage 24
The height of 4a H ₁ height H ₂ of the wall surface 25a of the branch passages 25
It is higher by a predetermined dimension (see FIG. 3).

The main refrigerant passage 24 and the branch passages 25, 25
Are communicated through throttle passages 28, 28. The throttle passage 28 is a slit formed from the upper end of both wall surfaces 24a, 24a of the main refrigerant passage 24 to a position lower than the upper end of the wall surface 25a of each branch passage 25 by a predetermined dimension. Therefore, the refrigerant liquid d supplied to the main refrigerant passage 24 is opposed to the branch passages 25, 25,.
Will flow into Therefore, a difference occurs between the amount of the condensed water d supplied to the main refrigerant passage 24 and the amount of the condensed water d flowing to each branch passage 25 through each of the throttle passages 28, and the liquid level in the main refrigerant passage 24 is changed. L ₁ is increased by a predetermined amount than the liquid level L ₂ in the branch passage 25 (see FIG. 3).

Each of the branch passages 25 is provided with the main refrigerant passage 2.
4, a first passage 29 extending at a right angle to communicate with the first nozzle 29 through the throttle passage 28, a bottom surface 30 a being higher than a bottom surface 29 a of the first passage 29 and communicating with the first nozzle portion 26. And two second passages 30 formed at right angles from one side of the first passage 30 to pass therethrough.

Each of the nozzles 26, 26,...
The evaporator 12 is formed downward from the tip of the bottom surface 30a of the second passage 30 so as to face the position directly above the evaporating heat transfer tubes 21, 21... And a hole penetrating through a protruding portion 31 having an inverted truncated cone shape that is integrally provided so as to protrude downward from the lower surface of the protruding portion 31.

The refrigerant spraying device 13 configured as described above
Has the following effects.

The condensed water d, which is the refrigerant liquid supplied from the condenser 9 to the main refrigerant passage 24, passes through the branch passages 25, 25,.
.., Etc., which are dropped on the outer circumference but have a higher specific gravity than the condensed water d existing in the condensed water d, are settled and retained in the process of flowing through the main refrigerant passage 24 and the branch passages 25. Therefore, there is almost no possibility that uneven spraying may occur due to clogging in the nozzle portions 26.

Moreover, in each branch passage 25, the first
In the process of flowing from the passage 29 to the second passage 30, dust and the like having a higher specific gravity than the condensed water d are settled and retained in the first passage 29 having a lower bottom surface, so that the dust and the like hardly reach the nozzle portion 26. Prevention of clogging of the nozzle portion 26 is further ensured. It is to be noted that dust and the like having a specific gravity lower than that of the condensed water d reach the upper portions of the nozzle portions 26 through the first and second passages 29 and 30, but the nozzle portions 26 and 26. Since it is formed downward from the bottom surface 30a of the passage 30, the nozzle portions 26, 26,.
Does not flow into the nozzle portions 26, 26,...

The main refrigerant passage 24 extends from the branch passage 25,
The distribution of the refrigerant liquid d to the throttle passages 28, 28,.
, The uniform distribution of the condensed water d from the nozzle portions 26, 26,... Can be more easily performed.

Further, the main refrigerant passage 24 and the branch passage 25,
Since the nozzles 25 and the nozzle portions 26 are formed as an integrally molded product, the cost can be reduced and the assemblability can be improved, and even if the heat transfer tubes 21, 21,. Can be easily dealt with only by changing the mold, does not require a very high assembling accuracy, and the range in which the inlets of all the nozzles 26, 26,... Are not exposed from the liquid surface even when the apparatus is slightly inclined. Can be applied evenly.

Second Embodiment FIGS. 6 to 9 show a refrigerant dispersing apparatus according to an absorption refrigeration apparatus according to a second embodiment of the present invention.

In this case, each branch passage 25 is a single passage formed at right angles from both sides of the main refrigerant passage 24, and two nozzles are provided in each branch passage 25 at a predetermined interval. Parts 26, 26 are formed respectively. A raised portion 32 is integrally formed at the entrance edge of each nozzle portion 26. The raised portion 32 is for damping the inflow of dust having a higher specific gravity than the condensed water d reaching the vicinity of the inlet edge of the nozzle portion 26 into the nozzle portion 26. 2
The prevention of clogging at 6 is further ensured. The other configuration and operation and effect are the same as those in the first embodiment, and the description is omitted.

[0040]

According to the present invention, the refrigerant circulates in the order of the regenerator 1, the condenser 9, the evaporator 12, and the absorber 15, and the heat transfer tube 2 for evaporation forming the evaporator 12.
In an absorption refrigerating apparatus provided with a refrigerant dispersing device 13 for dispersing a refrigerant liquid to 1, 21,.
, A main refrigerant passage 24 to which the refrigerant liquid d transferred from the condenser 9 is supplied, a plurality of branch passages 25 branching from the main refrigerant passage 24, and a tip end of each of the branch passages 25. Nozzle portion 26 for downwardly forming a coolant droplet formed downward on the
26 and is constituted by an integrally molded product of a synthetic resin having
The refrigerant liquid d supplied to the main refrigerant passage 24 is supplied to the branch passage 2
During the process of dropping from the nozzles 26, 26,... Onto the heat transfer tubes 21, 21,... Through the nozzles 26, 26,. Since the sediment is retained in the refrigerant passage 24 and the branch passages 25, 25,..., The nozzle portions 26, 26,.
There is an excellent effect that the possibility of non-uniform spraying due to clogging is reduced. Further, since the main refrigerant passage 24, the branch passages 25, 25, and the nozzle portions 26, 26,... Are integrally formed, a very high assembling accuracy is not required, and even if the device is slightly inclined. Even spraying can be performed in a range where the inlets of all the nozzle portions 26, 26,... Are not exposed from the liquid surface. Furthermore, since it is constituted by a synthetic resin integrally molded product, the cost is reduced, and even if the evaporating heat transfer tubes 21, 21,... .

The main refrigerant passage 24 and the branch passages 25, 25
When the refrigerant liquid d is distributed from the main refrigerant passage 24 to the branch passages 25, 25,... Through the throttle passages 28, 28,. , So that the coolant liquid d can be evenly and evenly distributed from the nozzles 26, 26,....

Each of the branch passages 25 includes a first passage 29 communicating with the main refrigerant passage 24, and a second passage 30 having a bottom surface higher than the first passage 29 and communicating with the nozzle portion 26. In this case, the sedimentation and retention of dust and the like having a higher specific gravity than the refrigerant liquid d is promoted also in the branch passage 25, and the prevention of clogging in the nozzle portions 26, 26,.

When the raised portion 32 is formed integrally with the inlet edge of each of the nozzle portions 26, dust having a higher specific gravity than the refrigerant liquid d that has reached near the inlet edge of the nozzle portion 26 flows into the nozzle portion 26. Therefore, the clogging of the nozzle portion 26 can be more reliably prevented.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a refrigeration cycle of an absorption refrigeration apparatus common to each embodiment of the present invention.

FIG. 2 is a plan view of a refrigerant distribution device in the absorption refrigeration device according to the first embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a plan view of a refrigerant distribution device in an absorption refrigeration device according to a second embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

8 is a sectional view taken along line VIII-VIII of FIG.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 6;

[Explanation of symbols]

1 is a high temperature regenerator, 6 is a low temperature regenerator, 9 is a condenser, 12 is an evaporator, 15 is an absorber, 21 is a heat transfer tube for evaporation, 24 is a main refrigerant passage, 25 is a branch passage, 26 is a nozzle portion, 28 is a throttle passage, 29 is a first passage, 29a is a bottom surface, 30 is a second passage, 30a is a bottom surface, 32 is a raised portion, a is a refrigerant vapor (water vapor), b is an absorbing liquid (lithium bromide concentrated solution), d is a refrigerant liquid (condensed water).

Claims (4)

[Claims] A refrigerant circulates in the order of a regenerator (1), a condenser (9), an evaporator (12) and an absorber (15), and an evaporating heat transfer tube ( 21) An absorption refrigeration system including a refrigerant spraying device (13) for spraying the refrigerant liquid (d) to (21)..., Wherein the refrigerant spraying device (13) is separated from the condenser (9). Main refrigerant passage (24) to which the transferred refrigerant liquid (d) is supplied
A plurality of branch passages (25) branching from the main refrigerant passage (24); and a nozzle portion (26) for lowering refrigerant droplets formed at the tip of each branch passage (25). ),
(26) An absorption refrigeration apparatus comprising an integrated molded article of a synthetic resin provided with (26). 2. The main refrigerant passage (24) and the branch passage (2).
The throttle passages (28), (2)
8) The absorption refrigeration system according to claim 1, wherein the absorption refrigeration system is communicated through a. 3. Each of the branch passages (25) has a first passage (29) communicating with the main refrigerant passage (24), a bottom surface higher than the first passage (29), and the nozzle portion (26). The absorption refrigeration system according to any one of claims 1 and 2, characterized by being constituted by a second passage (30) communicating with the refrigeration system. 4. The absorption type according to claim 1, wherein a raised portion (32) is integrally formed at an entrance edge of each of said nozzle portions (26). Refrigeration equipment.