JP2002277103A - Absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an absorber of absorption refrigerating machine in which refrigerant vapor can be absorbed surely into absorbing solution. SOLUTION: The absorber comprises an upper tank 11 having an inlet 15 being supplied with solution L for absorbing refrigerant vapor G, a lower tank 13 having an inlet 17 being supplied with refrigerant vapor G, an outlet 19 for discharging the solution L which has absorbed the refrigerant vapor G, a tube 21 disposed between the upper tank 11 and the lower tank 13 with the upper and lower end parts 21a, 21b thereof being inserted, respectively, into the upper and lower tanks 11, 13, and an inlet member 27 disposed at the upper end of the tube 21 and introducing the absorbing solution L to the inner wall face 21d of the tube 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an absorber for an absorption refrigerator.

[0002]

2. Description of the Related Art Conventionally, absorption refrigerators are disclosed in, for example, JP-A-11-83240 and JP-A-11-83350.
Japanese Unexamined Patent Application Publication No. H10-260, etc. are known. In general, this type of absorption refrigerator has an evaporator that obtains a refrigeration effect by decompressing and evaporating refrigerant vapor and removing heat of vaporization, and an absorber that absorbs and removes refrigerant vapor generated in the evaporator and continues evaporation. ,
A generator that absorbs the refrigerant vapor and heats the thinned absorbent to separate the refrigerant and raises the pressure to promote liquefaction of the refrigerant in the condenser, and a condenser that cools the refrigerant vapor and returns it to liquid refrigerant And

FIG. 8 shows an absorber under development, which has an upper tank 1 and a lower tank 2. The upper tank 1 is provided with an absorbing liquid inlet 3 to which an absorbing liquid for absorbing the refrigerant vapor is supplied. Further, the lower tank 2 is provided with a refrigerant vapor inlet 4 to which refrigerant vapor is supplied and an absorbent outlet 5 for discharging the absorbent absorbing the refrigerant vapor.

A tube 6 and a corrugated fin 7 are arranged between the upper tank 1 and the lower tank 2 to form a core portion 8. The upper tank 1 has a tube 6
The lower end of the tube 6 is inserted into the lower tank 2. In such an absorber, the absorbent flowing into the upper tank 1 from the absorbent inlet 3 of the upper tank 1 is introduced into the tube 6 from the upper end of the tube 6 and flows downward.

On the other hand, the refrigerant vapor flowing into the lower tank 2 from the refrigerant vapor inlet 4 of the lower tank 2 is introduced into the tube 6 from the lower end of the tube 6 and flows upward. Then, in the tube 6, the refrigerant vapor is absorbed by the absorbing liquid, and the amount of heat generated at the time of the absorption is radiated through the tube 6 and the corrugated fin 7. Then, the absorbing liquid diluted by absorbing the refrigerant vapor falls from the lower end of the tube 6 and is discharged from the absorbing liquid outlet 5 of the lower tank 2.

[0006]

However, in such an absorber, the absorbing liquid in the upper tank 1 is filled with the tube 6
Therefore, there is a problem that the contact area between the absorbing liquid flowing through the tube 6 and the refrigerant vapor is relatively small, and it is difficult to reliably absorb the refrigerant vapor into the absorbing liquid.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an absorber capable of reliably absorbing refrigerant vapor into an absorbing liquid.

[0008]

According to a first aspect of the present invention, there is provided an absorber including an upper tank having an absorbing liquid inlet for supplying an absorbing liquid for absorbing a refrigerant vapor, a refrigerant vapor inlet for supplying a refrigerant vapor, and a refrigerant. A lower tank having an absorbing liquid outlet for discharging the absorbing liquid that has absorbed the vapor, disposed between the upper tank and the lower tank, an upper end is inserted into the upper tank, and a lower end is inserted into the lower tank. And an inlet member disposed at an upper end of the tube and guiding the absorbing liquid to an inner wall surface of the tube.

According to a second aspect of the present invention, in the absorber according to the first aspect, the inlet member includes a main body disposed to cover a tube hole of the tube, and a main body formed in the main body. A gap forming portion that is maintained at a predetermined distance from an upper end of the tube, and a protrusion formed in the main body and inserted into the tube hole at a predetermined distance from an inner wall surface of the tube. And

According to a third aspect of the present invention, in the absorber according to the second aspect, the tube is a multi-hole tube formed with a plurality of tube holes, and the main body of the inlet member has The projection is formed corresponding to the tube hole. The absorber according to claim 4 is the absorber according to any one of claims 1 to 3, wherein the tube hole is formed at a lower end portion of the tube over a predetermined length in the axial direction from the lower end of the tube. Is formed to form a notch.

According to a fifth aspect of the present invention, in the absorber according to the fourth aspect, the notch is formed on a side of the lower tank opposite to the refrigerant vapor inlet.
According to a sixth aspect of the present invention, in the absorber according to any one of the first to fifth aspects, a holding means for holding the inlet member to the tube is arranged in the upper tank. Features.

According to a seventh aspect of the present invention, in the absorber according to any one of the first to sixth aspects, refrigerant vapor flowing into the lower tank from the refrigerant vapor inlet is guided to each tube. And a guide means for performing the operation.

(Function) In the absorber according to the first aspect, the absorbing liquid in the upper tank is guided to the inner wall surface of the tube by the inlet member disposed at the upper end of the tube, and is formed into a liquid film along the inner wall surface. Fall.

Therefore, the contact area with the refrigerant vapor rising in the tube is increased, and the refrigerant vapor is reliably absorbed by the absorbing liquid. In the absorber according to claim 2, the absorbing liquid is introduced into the tube from the gap between the main body formed by the gap forming part and the upper end of the tube, and the absorbing liquid is introduced into the gap between the protrusion and the inner wall surface of the tube. Guided to the inner wall surface of the tube.

According to the third aspect of the present invention, the absorbing liquid is guided to the inner wall surface of each tube hole of the multi-well tube. Claim 4
Since the notch is formed in the lower end of the tube in the absorber of the above, the lower end of the tube is prevented from being blocked by the surface tension of the absorbing liquid. In the absorber according to the fifth aspect, the notch is formed on the opposite side of the refrigerant vapor inlet of the lower tank, so that the refrigerant vapor does not directly hit the notch.

According to the sixth aspect of the present invention, the inlet member is held by the tube by the holding means arranged in the upper tank. In the absorber according to claim 7, the refrigerant vapor flowing in from the refrigerant vapor inlet portion is guided by the guide means arranged in the lower tank,
Guided uniformly in each tube.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 and FIG. 2 show an embodiment of the absorber of the present invention. The absorber of this embodiment is used, for example, in an air-cooled absorption refrigerator for an air conditioner of an automobile. The absorber of this embodiment has an upper tank 11 and a lower tank 13. Upper tank 11 and lower tank 13
Is formed of aluminum.

The upper tank 11 is provided with an absorbing liquid inlet 15 to which the absorbing liquid L for absorbing the refrigerant vapor G is supplied. The lower tank 13 is provided with a refrigerant vapor inlet 17 to which the refrigerant vapor G is supplied and an absorbent outlet 19 for discharging the absorbent L that has absorbed the refrigerant vapor G. A tube 21 and a corrugated fin 23 are arranged between the upper tank 11 and the lower tank 13 to form a core 25.

Tube 21 and corrugated fin 25
Is formed of aluminum. The upper tank 11 has the upper end 21 a of the tube 21 inserted therein, and the lower tank 13 has the lower end 21 b of the tube 21 inserted therein. In this embodiment, as shown in FIG. 3, a multi-hole tube having a plurality of tube holes 21c is used as the tube 21.

On the inner wall surface 21d of each tube hole 21c,
A fine groove 21e is formed. This groove 21e
Are formed in the axial direction of the tube 21. In this embodiment, the upper end of the tube 21 is
As shown in (2), an inlet member 27 for guiding the absorbent L is disposed on the inner wall surface 21d of the tube hole 21c of the tube 21.

The inlet member 27 is made of, for example, aluminum. FIG. 5 shows the details of the inlet member 27. The inlet member 27 has a main body 27a arranged to cover the tube hole 21c of the tube 21.

The main body 27a has the same outer shape as the outer shape of the end face of the tube 21. Body 27
a on both sides in the longitudinal direction of the main body 27a.
Gap forming part 27 which is maintained at a predetermined distance from the upper end of
b is formed. The gap forming portion 27b is composed of a projection integrally formed on both sides of the main body portion 27a, and includes, for example,
It has a height of about 0.5 mm to 2 mm.

Further, the tube 21 is provided in the main body 27a.
A plurality of protrusions 27c are integrally formed at intervals corresponding to the tube holes 21c. This protrusion 27c
The inner diameter of the tube hole 21c is smaller than that of the tube hole 2c.
1c. Then, as shown in FIG. 4, the shape is such that a predetermined interval, for example, an interval of about 0.5 mm to 2 mm is formed between the inner wall surface 21d of the tube hole 21c.

Therefore, the absorbing liquid L is introduced into the tube hole 21c from the gap W between the main body portion 27a formed by the gap forming portion 27b and the upper end of the tube 21, and the projecting portion 27c
It is guided to the inner wall surface 21d of the tube hole 21c through the gap between the inner wall surface 21d of the tube hole 21c. In this embodiment, as shown in FIG. 6, a notch 21f that cuts out the tube hole 21c from the lower end of the tube 21 over a predetermined length in the axial direction is formed at the lower end 21b of the tube 21. I have.

The notch 21f is formed so as to bisect the minor axis direction of the tube 21. Then, as shown in FIG. 7, the length B of the notch 21f in the vertical direction is
For example, the length is about 7 mm. By forming such a notch 21f, the absorbent L that has absorbed the refrigerant vapor G that has fallen through the tube hole 21c of the tube 21 faces the notch 21f at the upper end of the notch 21f due to surface tension. It moves to the inner wall surface 21d side and accumulates as a droplet L1 at the lower end of the tube 21 and falls naturally.

Therefore, the tube hole 21c is not blocked by the droplet L1, and the tube hole 2c
1c is ensured. The height A of the droplet L1 formed at the lower end of the tube 21 is, for example, about 2 mm. The notch 21f of the tube 21 is as shown in FIG.
As shown in FIG. 2, the lower tank 13 is formed on the opposite side of the refrigerant vapor inlet 17.

In this embodiment, holding means 29 for holding the inlet member 27 to the tube 21 is disposed in the upper tank 11. The holding means 29 includes a projection 31 integrally formed on the upper surface of the upper tank 11, and the lower end of the projection 31 is pressed against the upper surface of the main body 27 a of the inlet member 27. The lower tank 13 is provided with guide means 33 for guiding the refrigerant vapor G flowing from the refrigerant vapor inlet 17 to each tube 21.

The guide means 33 is provided with a semicircular guide member 3.
5 and the arc side is located upward. In addition, the refrigerant vapor inlet 17 is located below the guide member 35. The guide member 35 is made of a plate material made of aluminum,
For example, it is formed by press working.

In the above-described absorber, the refrigerant includes, for example,
HFC134a is used, and for example, D
MI (dimethylimidazolidinone) or NMP (n
-Methylpyrrolidone) is used. Then, the absorbent L that has flowed into the upper tank 11 from the absorbent inlet 15 of the upper tank 11 is introduced into the tube 21 from the upper end of the tube 21 via the inlet member 27 and along the inner wall surface 21d of the tube hole 21c. It flows downward.

On the other hand, the refrigerant vapor inlet 17 of the lower tank 13
The refrigerant vapor G flowing into the lower tank 13 from the
5 and is introduced into the tubes 21 from the lower ends of the tubes 21 and flows upward. Then, in the tube 21, the refrigerant vapor G is absorbed by the absorbing liquid L,
The amount of heat generated during this absorption is radiated through the tube 21 and the corrugated fins 23.

Then, the absorbing liquid L, which has absorbed and diluted the refrigerant vapor G, falls from the lower end of the tube 21 and the lower tank 1
3 is discharged from the absorbent outlet 19. In the above-described absorber, the inner wall surface 21 of the tube 21 is
Since the inlet member 27 for guiding the absorbing liquid L to d is arranged, the absorbing liquid L can reliably absorb the refrigerant vapor G.

That is, the absorption liquid L in the upper tank 11 is
By the inlet member 27 arranged at the upper end of the tube 21,
Since it is guided to the inner wall surface 21d of the tube 21 and falls along the inner wall surface 21d in a liquid film state, the contact area with the refrigerant vapor G rising inside the tube 21 increases, and the refrigerant vapor G Is reliably absorbed. Further, in the above-described absorber, since the inlet member 27 is formed by forming the gap forming portion 27b and the protruding portion 27c in the main body portion 27a, the absorbing liquid L can be easily and reliably guided to the inner wall surface 21d of the tube 21. Can be.

That is, the gap forming portion 27 of the inlet member 27
b, the absorbing liquid L is introduced into the tube 21 from the gap between the main body 27a and the upper end of the tube 21, and the absorbing liquid L is introduced into the tube 21 by the gap between the protrusion 27c and the inner wall surface 21d of the tube 21. Is guided to the inner wall surface 21d of the tube 21 easily and reliably.

In the above-described absorber, the tube 2
Since the multi-hole tube is used in the first embodiment, the contact area with the refrigerant vapor G can be further increased. Further, since the groove 21e is formed in the tube hole 21c, the absorbing liquid L can be reliably dropped along the inner wall surface 21d. Furthermore, in the above-described absorber, the lower end portion 21b of the tube 21
Since the notch 21f is formed in the tube 21, the lower end of the tube 21 can be prevented from being blocked by the surface tension of the absorbing liquid L, and the refrigerant vapor G can reliably flow into the tube 21 from the lower end of the tube 21. Can be.

In the above-described absorber, the notch 21f
Is formed on the opposite side of the lower tank 13 from the refrigerant vapor inlet 17, so that the refrigerant vapor G does not directly hit the notch 21 f, whereby the absorbing liquid L at the lower end of the notch 21 f is formed.
Can be prevented from being hindered by the refrigerant vapor G. Further, in the above-described absorber, the inlet member 2
Holding means 29 for holding tube 7 in upper tank 1
1, the inlet member 27 can be easily and reliably held on the tube 21.

Further, in the above-described absorber, since the guide means 33 for guiding the refrigerant vapor G flowing from the refrigerant vapor inlet 17 to each tube 21 is arranged in the lower tank 13, the refrigerant vapor G is uniformly distributed to each tube 21. Can be distributed. Further, the refrigerant vapor G is introduced into the tube 2 by the guiding means 33.
This prevents the lower end of the tube 1 from directly hitting the lower end of the tube 21, thereby preventing the drop of the absorbing liquid L at the lower end of the tube 21 from being hindered by the refrigerant vapor G.

In the above-described embodiment, the guide member 3
Although an example in which 5 is formed of an aluminum plate material has been described, the present invention is not limited to such an embodiment. For example, the guide member 35 may be formed of a net-like member. In the above-described embodiment, the lower tank 13
Although the example in which the refrigerant vapor inlet 17 is formed on the end face in the longitudinal direction has been described, the present invention is not limited to such an embodiment. For example, the refrigerant vapor inlet 17 is provided in the center of the lower tank 13 in the longitudinal direction. May be formed.

[0039]

As described above, in the absorber according to the first aspect, the inlet member for guiding the absorbing liquid to the inner wall surface of the tube is disposed at the upper end of the tube, so that the absorbing liquid reliably absorbs the refrigerant vapor. Can be. In the absorber according to the second aspect, since the inlet member is formed by forming the gap forming portion and the protruding portion in the main body, the absorbing liquid can be easily and reliably guided to the inner wall surface of the tube.

According to the third aspect of the present invention, since the multi-well tube is used as the tube, the contact area with the refrigerant vapor can be further increased. Then, the absorbing solution can be easily and reliably guided to the inner wall surface of each tube hole of the multi-well tube. In the absorber according to the fourth aspect, since the notch is formed at the lower end of the tube, the lower end of the tube can be prevented from being blocked by the surface tension of the absorbing liquid.

Therefore, the flow of the refrigerant vapor from the lower end of the tube is not obstructed. In the absorber according to the fifth aspect, the notch is formed on the opposite side of the refrigerant vapor inlet of the lower tank, so that the refrigerant vapor does not directly hit the notch. Therefore, it is possible to prevent the drop of the absorbing liquid at the lower end of the notch from being hindered by the refrigerant vapor.

In the absorber according to the sixth aspect, since the holding means for holding the inlet member in the tube is disposed in the upper tank, the inlet member can be easily and reliably held in the tube.
In the absorber according to the seventh aspect, since the guide means for guiding the refrigerant vapor flowing from the refrigerant vapor inlet to each tube is arranged in the lower tank, the refrigerant vapor can be uniformly distributed to each tube.

[Brief description of the drawings]

FIG. 1 is a vertical front view showing one embodiment of an absorber of the present invention.

FIG. 2 is a transverse sectional view taken along the line II-II in FIG.

FIG. 3 is a front view showing the tube of FIG. 1;

FIG. 4 is an explanatory view showing details of an inlet member of FIG. 1 and its vicinity.

FIG. 5 is an explanatory view showing details of an inlet member of FIG. 1;

FIG. 6 is an explanatory view showing a lower end portion of the tube of FIG. 1;

FIG. 7 is an explanatory diagram showing a state in which droplets of an absorbing liquid are accumulated at a lower end portion of the tube of FIG. 1;

FIG. 8 is an explanatory view showing a conventional absorber.

[Explanation of symbols]

 11 Upper Tank 13 Lower Tank 15 Absorbent Inlet 17 Coolant Vapor Inlet 19 Absorbent Outlet 21 Tube 21a Upper Part 21b Lower Part 21c Tube Hole 21d Inner Wall 21f Notch 27 Inlet Member 27a Main Body 27b Gap Forming Part 27c Projection Part 29 Holding means 33 Guide means G Refrigerant vapor L Absorbing liquid

Claims (7)

[Claims] 1. An absorbing liquid (L) for absorbing a refrigerant vapor (G).
An upper tank (11) having an absorbent inlet (15) to which the refrigerant is supplied, a refrigerant vapor inlet (17) to which the refrigerant vapor (G) is supplied, and an absorbent (L) absorbing the refrigerant vapor (G) A lower tank (13) having an absorbent outlet (19) for discharging water; and an upper end (21a) disposed between the upper tank (11) and the lower tank (13). A tube (21) into which a lower end (21b) is inserted into the lower tank (13) and the absorbing liquid is placed on an inner wall surface (21d) of the tube (21) disposed at an upper end of the tube (21). An inlet member (27) for guiding (L); 2. The absorber according to claim 1, wherein the inlet member (27) includes a main body (27a) arranged to cover a tube hole (21c) of the tube (21), and the main body (27). 27a) and the main body (27a).
A gap forming portion (27b) for maintaining a predetermined distance from the upper end of the tube (21), and the tube hole (21) formed in the main body (27a).
c) an inner wall surface (21d) of the tube (21) and a protruding portion (27c) inserted at a predetermined interval into the tube (21). 3. The absorber according to claim 2, wherein the tube (21) has a plurality of tube holes (21c).
And the main body (27a) of the inlet member (27) is formed with the protruding portion (27c) corresponding to each tube hole (21c). Characteristic absorber. 4. The absorber according to claim 1, wherein a lower end portion (21b) of the tube (21) has a predetermined length in the axial direction from a lower end of the tube (21). An absorber characterized in that a notch (21f) for notching the tube hole (21c) is formed over a length. 5. The absorber according to claim 4, wherein the notch (21f) is formed in the lower tank (13) on the side opposite to the refrigerant vapor inlet (17). Absorber. 6. The absorber according to claim 1, wherein the upper tank (11) has a holding means (27) for holding the inlet member (27) in the tube (21). 29) An absorber, wherein: 7. The absorber according to claim 1, wherein the lower tank (13) is provided with the refrigerant vapor inlet (1).
7) the refrigerant vapor (G) flowing from each tube (21)
A guide means (33) for guiding the absorber.