JPH11351700A - Plate-type evaporator of absorption refrigerating machine and absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high evaporator performance and absorption-type performance while simplifying the structure. SOLUTION: In the plate-type evaporator or absorber of an absorption refrigerating machine for evaporating while allowing a flow-down refrigerant liquid Rw to exchange heat with a flowing fluid to be cooled at the gap between plates by allowing the refrigerant liquid Rw or an absorption liquid Lc to flow down in a membrane form along each outer surface of a flow-down plate 26 or for absorbing by a surrounding refrigerant steam while allowing the flow- down absorption liquid Lc to exchange heat with a fluid for flow cooling at the gap between plates with the gap between two flow-down plates 26 as the channel of a fluid to be cooled or a fluid for cooling. In the plate-type evaporator and absorber, a number of recessed parts 33 are formed on the flow-down plate 26 while they are dispersed in the direction of the plate surface, projecting parts at the side of the gap between plats of the recessed parts 33 of one flow- down plate 26 and those of the other flow-down plate 26 are allowed to oppose and touch each other, thus subdividing the channel of the fluid to be cooled and that of the fluid for cooling at the gap between plates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-type evaporator and a plate-type absorber used in an absorption refrigerator, and more particularly, to a gap between two flow-down plates whose plate surfaces face each other. Is used as the flow path of the fluid to be cooled, and the outer surface of each of the flow-down plates is used as the lower surface of the refrigerant liquid, and the refrigerant liquid supplied from the refrigerant liquid supply unit flows down along the outer surface of each of the flow-down plates in a film form. The plate-type evaporator of the absorption refrigerator in which the flowing refrigerant liquid is evaporated while exchanging heat with the fluid to be cooled in the gap between the plates, and the two flowing plates having the plate surfaces facing each other The gap between the plates as the flow path of the cooling fluid, and the outer surface of each of these falling plates as the lower surface of the absorbing liquid, the supply of the absorbing liquid from the absorbing liquid supply unit to the outer surface of each of the flowing plates. By flowing down along the membrane The falling absorbing fluid about the plate type absorber absorption chiller to absorption to the refrigerant vapor around while flowing cooling fluid and the heat exchange in the plates gap.

[0002]

2. Description of the Related Art Conventionally, in a plate-type evaporator or a plate-type absorber of this type, as shown in FIG. 5, a deck plate-shaped core material is provided between two opposed falling plates 26. By interposing X in the vertical groove position, its core material X
The flow of the cooling fluid C and the cooling fluid W in the gap between the plates is disturbed by the subdivision of the flow path due to
Improving the evaporator performance and absorber performance by increasing the heat transfer performance of the heat exchange using the falling plate 26 as a heat transfer wall, and brazing the core material X to each of the two falling plates 26 on both sides. As a result, the difference between the gap between the plates and the outer region of the two downstream plates 26 (that is, the evaporation region of the flowing refrigerant liquid Rw in the evaporator, and the absorption region of the flowing absorbing liquid Lc for the refrigerant vapor Rv in the absorber). There is one that ensures high pressure resistance against pressure (see Japanese Patent Application No. 9-25057).

[0003]

However, in the above-mentioned conventional structure, the core material, which is separate from the downflow plate, is interposed between the downflow plates. There is a problem that the cost is high and the weight of an assembly unit as an evaporator or an absorber is increased, resulting in an increase in the weight of the absorption refrigerator.

[0004] In view of the above circumstances, a main object of the present invention is to solve the above-mentioned problem effectively by a simple improvement to the falling plate.

[0005]

Means for Solving the Problems [1] In the invention according to the first aspect, a gap between the two flow-down plates whose plate surfaces face each other is used as a flow path of the fluid to be cooled, and By setting the outer surface of each of these falling plates as the lower surface of the refrigerant liquid, the supply refrigerant liquid from the refrigerant liquid supply unit is caused to flow down along the outer surface of each of the falling plates in a film form, so that the flowing refrigerant liquid is formed between the plates. In the plate type evaporator of the absorption refrigerator in which the heat is exchanged with the fluid to be cooled in the plate-type evaporator, the flow-down plate is provided with a concave portion on the outer surface and a convex portion on the side between the plate gaps in the surface direction. A large number is formed by dispersing in, and the inter-plate gap-side convex portion of the dent portion of the one falling plate and the inter-plate gap side convex portion of the dent portion of the other falling plate are brought into facing contact with each other,
Alternatively, the flow path of the fluid to be cooled in the gap between the plates is made by contacting the inter-plate gap side convex portion of the depression in one of the falling plates with the flat portion of the other falling plate.

That is, in this configuration, the flow of the fluid to be cooled in the gap between the plates is subdivided as described above, thereby disturbing the flow of the fluid to be cooled in the gap between the plates. The heat transfer of heat exchange between the fluid to be cooled flowing through the cooling medium and the refrigerant liquid flowing down on the outer surface of the falling plate in a film form can be enhanced, and the evaporator performance can be effectively improved.

[0007] In the subdivision, a number of depressions are formed in the falling plate, and the inter-plate gap side projection of the depression in the one falling plate and the inter-plate gap side projection of the depression in the other falling plate. By contacting the portion with the portion, or by contacting the inter-plate gap side convex portion of the recessed portion of one of the flow-down plates with the flat portion of the other flow-down plate, the flow path of the fluid to be cooled in the inter-plate gap. Since it is subdivided, it is 2
By interposing a core material of another member between the falling plates, the flow path of the fluid to be cooled in the gap between the plates can be reduced, and such a core material is unnecessary and the number of parts can be reduced. Thereby, the production can be facilitated and the production cost can be reduced, the assembly unit as an evaporator can be reduced in size, and the absorption refrigerator can be reduced in size. .

In addition, since a large number of depressions, which become concave portions on the outer surface and become convex on the side between the plate gaps, are dispersed in the plate surface direction and formed on the flow-down plate, the size of the flow-down plate is not increased. The heat transfer area can also be increased, and the evaporator performance can be more effectively enhanced in combination with the improvement of the heat conductivity due to the subdivision of the inter-plate gap flow path. Because the miniaturization becomes possible, coupled with the lightening of the evaporator due to the elimination of the core material as described above,
The size of the absorption refrigerator can be reduced more effectively.

[2] In the second aspect of the present invention, in the above-described first aspect of the present invention, the inter-plate gap side projections of the dent portions brought into contact with each other or the dents brought into contact with each other. And the flat portion of the other flow-down plate is brazed and connected.

That is, according to this configuration, the two downstream plates are connected to each other by the above-mentioned brazing, so that the gap between the plates and the outer region of the both downstream plates (that is, the evaporation region of the flowing refrigerant liquid) are formed. High withstand pressure against the differential pressure generated between them.

In addition, since the inter-plate gap side protrusions of the recesses which are brought into contact with each other, or the inter-plate gap side protrusions of the contacted recess and the flat portion of the other falling plate are connected by brazing.
The brazing operation can be facilitated as compared with the above-described conventional structure in which the core material interposed between the two falling plates is brazed and connected to each of the two falling plates.

[3] According to a third aspect of the present invention, in the embodiment of the first or second aspect described above, an opposing contact portion between the inter-plate gap side convex portions of the dent portion or the dent portion. The contact portion between the inter-plate gap side convex portion and the flat portion of the other falling plate is arranged in a zigzag pattern when the falling plate is viewed from the plate surface.

That is, according to this configuration, each of the flow of the fluid to be cooled divided into two flows by the opposed contact portion or the contact portion located on the upstream side in the gap between the plates is one stage downstream. In the form of further dividing into two flows by the opposed contact portion or the contact portion, in the entire space between the plate gaps in the plate surface direction of the falling plate, turbulence can be effectively given to the flow of the fluid to be cooled, The heat transfer of heat exchange between the fluid to be cooled flowing through the gap between the plates and the refrigerant liquid flowing down in the form of a film on the outer surface of the falling plate can be more effectively improved, thereby improving the evaporator performance. It can be achieved more effectively.

According to the first to third aspects of the present invention, if the lyophilic treatment for the flowing-down refrigerant liquid is performed on an outer surface of the flowing-down plate, the flowing-down plate for causing the refrigerant liquid to flow down in a film form. On the outer surface of the lyophilic treatment, it is possible to prevent the occurrence of a dry portion in which the film of the flowing-down refrigerant liquid is partially absent (in short, a film cut portion),
This, coupled with the improvement in heat transfer due to the subdivision of the inter-plate gap flow path, the heat exchange between the fluid to be cooled flowing in the inter-plate gap and the refrigerant liquid flowing down the outer surface of the falling plate in a film form. The heat transfer can be more effectively improved, and the evaporator performance can be more effectively improved.

[4] In the invention according to claim 4, the gap between the two flow-down plates whose plate surfaces face each other is used as a cooling fluid flow path, and the outside of each of these flow-down plates. With the surface as the lower surface of the absorbing liquid, the absorbing liquid supplied from the absorbing liquid supply section is caused to flow down in a film form along the outer surface of each of the falling plates, so that the flowing absorbing liquid and the fluid for cooling in the gap between the plates. In a plate-type evaporator of an absorption refrigerator in which heat is exchanged with the surrounding refrigerant vapor, a recessed portion that becomes a concave portion on the outer surface and a convex portion on the side between the plate gaps is provided on the falling plate. Dispersed in the direction to form a large number, and the plate-to-plate gap side convex portion of the dent in the one falling plate and the plate-to-plate gap side convex portion of the dent in the other falling plate in opposing contact, or Of the recess on the gap between the plates in the falling plate In contact with the planar portion of the plate, subdividing the flow passage of the cooling fluid in the plates gap.

That is, in this configuration, the flow of the cooling fluid in the gap between the plates is divided as described above, thereby disturbing the flow of the cooling fluid in the gap between the plates. The heat transfer between the cooling fluid flowing through the cooling plate and the absorbing liquid flowing down the outer surface of the falling plate in the form of a film can be enhanced, and the performance of the absorber can be effectively improved.

In the subdivision, a large number of depressions are formed in the falling plate, and the inter-plate gap side projection of the depression in the one falling plate and the inter-plate gap side projection of the depression in the other falling plate. By contacting the portion with the portion, or by contacting the inter-plate gap side convex portion of the recessed portion of one of the flow-down plates with the flat portion of the other flow-down plate, the flow path of the cooling fluid in the inter-plate gap. Since it is subdivided, it is 2
By interposing a core member of another member between the falling plates, the flow path of the cooling fluid in the inter-plate gap is subdivided, so that such a core member is unnecessary and the number of parts can be reduced. Thereby, the production can be facilitated and the production cost can be reduced, the assembly unit as an absorber can be reduced in size, and the absorption refrigerator can be reduced in size. .

In addition, since a large number of depressions which become concave portions on the outer surface and become convex portions between the plate gaps are dispersed in the plate surface direction and formed on the flow-down plate, the size of the flow-down plate is not increased. The heat transfer area can also be increased, and the performance of the absorber can be more effectively improved in combination with the improvement of the heat conductivity due to the subdivision of the inter-plate gap flow path. From the fact that miniaturization is possible, coupled with the lightness of the absorber by eliminating the need for the core material as described above,
The size of the absorption refrigerator can be reduced more effectively.

[5] According to a fifth aspect of the present invention, in the above-described embodiment of the fourth aspect of the present invention, the inter-plate gap side protrusions of the dent portions brought into contact with each other or the dents brought into contact with each other. And the flat portion of the other flow-down plate is brazed and connected.

That is, according to this configuration, the two downstream plates are connected to each other by the above-mentioned brazing, so that the gap between the plates and the outer region of the both downstream plates (that is, the absorption of the downstream absorbing liquid with respect to the refrigerant vapor). High pressure resistance with respect to the generated differential pressure between the pressure difference and the working area).

In addition, since the inter-plate gap side projections of the recesses which are brought into contact with each other, or the inter-plate gap side projections of the contacted recesses and the plane portion of the other flow-down plate are connected by brazing.
The brazing operation can be facilitated as compared with the above-described conventional structure in which the core material interposed between the two falling plates is brazed and connected to each of the two falling plates.

[6] In the invention according to claim 6, in the implementation of the invention according to claim 4 or 5, the opposing contact portion between the inter-plate gap side protrusions of the dent portion or the dent portion. The contact portion between the inter-plate gap side convex portion and the flat portion of the other falling plate is arranged in a zigzag pattern when the falling plate is viewed from the plate surface.

In other words, according to this structure, each of the cooling fluid flows divided into two streams by the opposed contact portion or the contact portion located on the upstream side in the gap between the plates is one stage downstream. In the form of further dividing into two flows by the opposed contact portion or the contact portion, in the entire space between the plate gaps in the plate surface direction of the falling plate, turbulence can be effectively given to the flow of the cooling fluid, whereby The heat transfer of heat exchange between the cooling fluid flowing through the gap between the plates and the absorbing liquid flowing down in a film form on the outer surface of the falling plate can be more effectively improved, thereby improving the performance of the absorber. It can be achieved more effectively.

In the practice of the invention according to claims 4 to 6, the outer surface of the falling plate is subjected to a lyophilic treatment for the falling absorbing liquid, so that the falling liquid flows down in a film form. On the outer surface of the lyophilic treatment, it is possible to prevent the occurrence of a dry portion (in short, a cut portion of the film) in which the film of the falling absorbent is partially absent,
This, coupled with the improvement in heat transfer due to the subdivision of the inter-plate gap flow path, heat exchange between the cooling fluid flowing in the inter-plate gap and the absorbing liquid flowing down the outer surface of the falling plate in a film form. The heat transfer can be more effectively improved, and the performance of the absorber can be more effectively improved.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic configuration of an absorption refrigerator, and 1 shows a structure in which a rare absorbing liquid Ls containing a refrigerant R is heated by a heater 2 to generate a refrigerant vapor Rv. And a condenser 3 for cooling and condensing the high-temperature refrigerant vapor Rv generated in the regenerator 1 by the cooler 4, and a condenser 5 flowing down from the condenser 3 through the refrigerant supply path 6. An evaporator that evaporates the supplied refrigerant liquid Rw by removing vaporized heat from the cooled fluid C (for example, brine or water) to cool the cooled fluid C. Reference numeral 7 denotes a refrigerant vapor Rv generated in the evaporator 5.
Is absorbed in the concentrated absorption liquid Lc. By the absorption of the refrigerant vapor Rv by the absorber 7, the pressure inside the body 8 containing the evaporator 5 and the absorber 7 is reduced, and the evaporator 5 The refrigerant is evaporated at a low temperature in a reduced pressure atmosphere.

The absorber 7 removes the heat of absorption generated by the absorption of the refrigerant by the cooling water W as a cooling fluid, and then supplies the cooling water W to the cooler 4 of the condenser 3 to condense the heat. It is used for cooling the high-temperature refrigerant vapor Rv in the vessel 3.

In the present embodiment, water is used for the refrigerant R, and an aqueous solution of lithium bromide is used for the absorbing liquid L.

Reference numeral 9 denotes that, while allowing the movement of the refrigerant vapor Rv from the evaporator region to the absorber region inside the barrel 8, droplets of the refrigerant liquid Rw enter the absorber region from the evaporator region. An eliminator 10 for preventing liquid droplets of the absorbing liquid L from entering the evaporator region from the absorber region 10 is a refrigerant liquid Rw received by the refrigerant liquid receiver 11 at the bottom of the body 8 without being completely evaporated by the evaporator 5. A refrigerant pump that sends the refrigerant through the refrigerant circulation path 12 to the upper part of the evaporator region and circulates the evaporator 5;
Reference numeral 13 denotes an absorption liquid pump which sends the diluted absorption liquid Ls received by the absorption liquid receiver 14 at the bottom of the body 8 to the regenerator 1 via the diluted absorption liquid path 15 after absorbing the refrigerant vapor Rv by the absorber 7. .

Reference numeral 16 denotes a concentrated absorption liquid passage for supplying the concentrated absorption liquid Lc from which the refrigerant R has been separated in the regenerator 1 to the absorber 7, and reference numeral 17 denotes a retained heat of the concentrated absorption liquid Lc sent from the regenerator 1 to the absorber 7 This is an absorbent heat exchanger for preheating the diluted absorbent Ls that is collected and returned to the regenerator 1.

As shown in FIG. 2, the evaporator 5 and the absorber 7
The evaporator 5 has a plurality of refrigerant liquid flow-down panels 5A arranged side by side in a parallel vertical posture in an evaporator region inside the body 8, and each refrigerant liquid as a refrigerant liquid supply unit. A refrigerant liquid disperser 18 for uniformly dispersing the refrigerant liquid Rw in the width direction of the panel and supplying the refrigerant liquid Rw to both surfaces of the falling panel 5A from the upper edge side. Similarly, the absorber 7 includes an absorber inside the body 8. A plurality of absorbent flow-down panels 7A arranged side by side in a parallel vertical orientation in the region, and the concentrated absorbent Lc is evenly distributed in the panel width direction from the upper edge side to both surfaces of each absorbent flow-down panel 7A as an absorbent supply section. Absorbent disperser 19 supplied
It consists of

Reference numeral 20 denotes a support frame for supporting the refrigerant flow-down panel 5A and the absorption liquid flow-down panel 7A, and reference numeral 21 denotes a support frame for supporting the refrigerant flow-down panel 5A and the absorption liquid flow-down panel 7A from the side.

Next, the specific structure of the refrigerant liquid disperser 18 and the refrigerant liquid falling panel 5A on the evaporator side, and the specific structure of the absorbent liquid disperser 19 and the absorbent liquid falling panel 7A on the absorber side will be described. Since these are almost the same structure on the evaporator side and the absorber side, FIGS. 3 and 4 showing these structures show both the evaporator side and the absorber side for simplification of explanation. There is.

As shown in FIGS. 3 and 4, the refrigerant liquid disperser 18 and the absorbing liquid disperser 19 are disposed above the juxtaposed row of the refrigerant liquid drop panels 5A and above the juxtaposed row of the absorbent liquid drop panels 7A. The main supply gutters 22A, 22B provided, the upper edge side of each refrigerant liquid falling panel 5A, and each absorbing liquid falling panel 7
A gutter-like body 24 closed at both ends, which is connected to the upper edge side of A and receives a fixed amount of the refrigerant liquid Rw or the concentrated absorption liquid Lc by dropping from the main supply gutters 22A and 22B through the outflow device 23. A large number of slits 25 for liquid outflow are formed on both side walls of the trough 24 at predetermined intervals.

That is, the refrigerant liquid R received by the gutter 24
By letting w or the concentrated absorbent Lc flow out from the multiple liquid outflow slits 25 on both side walls, the refrigerant liquid Rw is absorbed on both surfaces of each refrigerant liquid falling panel 5A, and the concentrated liquid is absorbed on both surfaces of each absorbent liquid falling panel 7A. The liquid Lc is supplied from the upper edge side in a state of being uniformly dispersed in the panel width direction, whereby the refrigerant liquid Rw is formed into a film along the panel surface on both surfaces of each refrigerant liquid flowing down panel 5A. The concentrated absorbent Lc is caused to flow down in a film form along the surface of each absorbent liquid flowing down panel 7A on both sides of the panel.

The main supply gutter 22A on the side of the evaporator 5 has:
The refrigerant supply path 6 from the condenser 3 and the refrigerant circulation path 12 from the refrigerant pump 10 are connected, and the main supply gutter 22B on the absorption side 7 side is connected to the rich absorption liquid path 16 from the regenerator 1. It is.

As shown in FIGS. 3 and 4, the refrigerant flow-down panel 5A and the absorption liquid flow-down panel 7A have a gap between the two flow-down plates 26 arranged opposite to each other. It is formed into a plate-like container structure in which the peripheral edge between the plate gaps is closed while leaving a fluid inlet 27a at one lower end and a fluid outlet 28a at one upper end, and the lower edge of each panel 5A, 7A has a lower end. An introduction tubular portion 27 is formed to allow the fluid to be cooled C and the cooling water W supplied from one fluid inlet 27a to spread over the entire width between the plate gaps, while the upper edges of the panels 5A and 7A are formed at the upper edges. An outlet tubular portion 28 is formed to receive the fluid C to be cooled and the cooling water W in the entire width of the gap between the plates and to guide the fluid C to the fluid outlet 28a on the upper end side. The gap between the falling plates 26 is set in the evaporator 5
And the gap between the two flow-down plates 26 in the absorbent flow-down panel 7A is used as the flow path of the cooling water W as the cooling fluid in the absorber 7. .

That is, in the evaporator 5, the refrigerant liquid Rw is supplied to both surfaces of the refrigerant liquid falling panel 5A (that is, the two falling plates 26).
On the other hand, the cooling fluid C to be supplied from the cooling fluid supply header 29 to the fluid inlet 27a through the branch pipe 29a flows between the plates in the refrigerant liquid falling panel 5A. By passing through the flow path in the gap (that is, the back surface side of each of the two falling plates 26), the falling refrigerant liquid Rw is evaporated while removing vaporized heat from the fluid C to be cooled.

In the absorber 7, the concentrated absorbing liquid Lc is applied to both surfaces of the absorbing liquid flowing down panel 7A (ie, the two flowing down plates 26).
On the other hand, the cooling water W supplied from the cooling water supply header 30 to the fluid inlet 27a through the branch pipe 30a is supplied to the absorbing liquid flowing down panel 7 while flowing down the film along the respective outer surfaces).
A (ie, two falling plates 2)
6 on the back side) so that the falling absorption liquid Lc
Is absorbed by the surrounding refrigerant vapor Rv while being cooled by the cooling water W.

Numeral 31 denotes a fluid outlet 2 of the refrigerant liquid falling panel 5A.
A cooled fluid discharge header 32, which collects and outputs the cooled fluid C delivered from the outlet pipe 8a via the branch pipe 31a, and the cooling water W delivered from the fluid outlet 28a of the absorbent flow-down panel 7A through the branch pipe 32a. This is a cooling water discharge header that is collected and derived.

Each of the two falling plates 26 forming the refrigerant liquid falling panel 5A and the absorbing liquid falling panel 7A has a hemispherical depression which becomes a concave portion on the outer surface thereof and becomes a convex portion between the plate gaps. A large number of the portions 33 are dispersed in the plate surface direction, and in a state where the assembly units as the refrigerant liquid flowing down panel 5A and the absorbing liquid flowing down panel 7A are formed, the recessed portion 33 of one of the flow down plates 26 has a gap between the plates. By making the protruding portion and the inter-plate gap side protruding portion of the other flow-down plate 26 face each other, the flow path of the fluid C to be cooled in the inter-plate gap is subdivided in the refrigerant flow-down panel 5A. In FIG. 7A, the flow path of the cooling water W in the gap between the plates is subdivided.

That is, by dividing the inter-plate gap flow path in this manner, the flow of the cooling fluid C and the flow of the cooling water W in the inter-plate gap are disturbed. , The fluid C to be cooled flowing in the gap between the plates and the refrigerant liquid R flowing down in a film form along the outer surface of each of the falling plates 26.
In addition, the evaporator performance is enhanced by increasing the heat transfer of heat exchange between the cooling water W and the cooling water W flowing through the gap between the plates and the outer surface of each of the falling plates 26 along the film surface. The heat transfer between the concentrated absorption liquid Lc flowing down and the heat transfer is enhanced to enhance the absorber performance.

The depressions 33 are arranged in a zigzag pattern when viewed from the surface of the flow-down plate 26, and the inter-plate gap side protrusion between the depression 33 of the one flow-down plate 26 and the depression 33 of the other flow-down plate 26. The opposing contact portions are arranged in a staggered manner when viewed from the downflow plate surface, whereby the flow of the cooled fluid C or the cooling water W divided into two flows by the opposing contact portions located on the upstream side in the gap between the plates. Each of the flows is further divided into two flows by the opposed contact portion located one stage downstream, and the fluid to be cooled C and the cooling water W
The turbulence is effectively given to the flow of water.

Further, the recessed portions 3 to be brought into opposing contact as described above
The inter-plate gap side projections of No. 3 are connected to each other by brazing, so that the inter-plate gap as the flow path of the fluid C to be cooled and the outer area as the evaporation area of the refrigerant liquid Rw are formed in the refrigerant liquid falling panel 5A. High pressure resistance against the differential pressure generated between
Further, in the absorbent flow-down panel 7A, the pressure resistance against the differential pressure generated between the gap between the plates as the flow path of the cooling water W and the outer region as the absorption region for the refrigerant vapor Rv of the concentrated absorbent Lc is increased. It is ensured.

The outer surfaces of the two flow-down plates 26 forming the refrigerant flow-down panel 5A and the absorption-liquid flow-down panel 7A are plated with iron as lyophilic treatment for the flow-down refrigerant liquid Rw and the flow-down absorption liquid Lc. Oxidation treatment, or, baking treatment of copper particles, or, baking treatment of copper alloy particles, or, and select and apply one or more of baking treatment of iron particles, A large number of narrow grooves 34 are formed, whereby the film of the flowing refrigerant liquid Rw and the film of the flowing absorbing liquid Lc are formed on the outer surface of the falling plate 26 for causing the refrigerant liquid Rw and the concentrated absorbing liquid Lc to flow down in a film form. It is possible to prevent the occurrence of a partially-existing dry portion (film cut portion).

[Another Embodiment] Next, another embodiment will be described.

In the above-described embodiment, the protruding portion of the recess 33 in the one downflow plate 26 on the gap side between the plates and the other downflow plate 26
The flow path between the plate gaps was subdivided by opposing the inter-plate gap side projections of the depressions 33 in the above, but instead of this, the inter-plate gap side projections of the depressions 33 in one of the flow-down plates 26 were replaced. A mode in which the flow path between the plate gaps is subdivided by making contact with the flat portion of the other falling plate 26 may be adopted.

The shape of each concave portion 33 is not limited to a hemispherical shape, and various shapes such as a groove shape as viewed from the concave portion side can be adopted. Good.

The arrangement of opposing contact portions between the inter-plate gap side protrusions of the recessed portion 33 or the arrangement of the contact portion between the inter-plate gap side protrusion of the recessed portion 33 and the flat portion of the other flow-down plate is not always required to flow down. The arrangement of the plate 26 is not limited to the staggered arrangement when viewed from the plate surface, and other various arrangement forms can be adopted.

In the above-described embodiment, a plurality of refrigerant flow-down panels 5A are arranged in parallel in the evaporator area inside the body 8, and a plurality of absorbent liquid flow-down panels 7A are arranged in the absorber area adjacent to the evaporation area. Although the structure in which the cooling liquid flowing down panels 5A and the absorbing liquid flowing down panels 7A are alternately arranged and arranged side by side may be adopted instead of this.

The refrigerant liquid Rw is not limited to water, and various other liquids can be used as the refrigerant liquid Rw.
The absorption liquid L is not limited to the aqueous lithium bromide solution, and various other liquids can be used as the absorption liquid L.

The cooling fluid C is not limited to water or brine, and the cooling fluid W is not limited to water.

In the above embodiment, a single-effect absorption refrigerator has been described, but the present invention can be applied to a multiple-effect absorption refrigerator including a double-effect absorption refrigerator.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an absorption refrigerator.

FIG. 2 is a perspective view of an evaporator and an absorber.

FIG. 3 is a front view of a downflow panel.

FIG. 4 is a side sectional view of the downflow panel.

FIG. 5 is a partially broken perspective view showing a conventional structure.

[Explanation of symbols]

 18 Refrigerant liquid supply unit 19 Absorbent liquid supply unit 26 Downflow plate 33 Depression C Fluid to be cooled Lc Absorbent liquid Rw Refrigerant liquid

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kaoru Watanabe 3-10 Fukuura, Kanazawa-ku, Yokohama, Kanagawa Prefecture From Japan Co., Ltd. (72) Inventor Hidemitsu Hideshima 3-10 Fukuura, Fukuura, Kanazawa-ku, Yokohama, Kanagawa Japan Article Inside the corporation

Claims (6)

[Claims] An inter-plate gap between two flow-down plates whose plate surfaces face each other is used as a flow path of a fluid to be cooled, and an outer surface of each of the flow-down plates is used as a flow lower surface of a refrigerant liquid. By causing the supply refrigerant liquid from the refrigerant liquid supply unit to flow down along the outer surface of each of the flow-down plates in a film form, the flow-down refrigerant liquid evaporates while exchanging heat with the fluid to be cooled in the gap between the plates. A plate-type evaporator of a type refrigerator, wherein a number of depressions, which become concave portions on the outer surface and become convex portions on the side between the plate gaps, are dispersed in the plate surface direction on the flow-down plate; The plate-to-plate gap side protrusion of the depression in the flow-down plate and the plate-to-plate clearance side protrusion of the depression in the other flow-down plate are in opposing contact, or the depression in one of the flow-down plates Of the gap between the plates on the plane portion of the other falling plate By touch, the plate type evaporator of an absorption refrigerating machine which had been subdivided flow path of the cooling fluid in the plates gap. 2. The inter-plate gap side projections of the depressions which are brought into opposing contact with each other, or the inter-plate gap side projections of the depressions which are brought into contact with the flat part of the other falling plate are connected by brazing. 2. The plate type evaporator of an absorption refrigerator according to claim 1, wherein: 3. An opposing contact portion between the inter-plate gap side protrusions of the recess, or a contact portion between the inter-plate gap side protrusion of the recess and the flat portion of the other flow-down plate, 3. The plate-type evaporator of an absorption refrigerator according to claim 1, wherein the plate-type evaporator is arranged in a staggered shape when viewed from a plate surface. 4. A cooling fluid flow path between the two flow-down plates whose plate surfaces face each other, and an outer surface of each of the flow-down plates as a flow lower surface of the absorbing liquid. By flowing the absorption liquid supplied from the absorption liquid supply section along the outer surface of each of the flow-down plates in a film-like manner, the surrounding refrigerant is exchanged with the flowing cooling fluid in the gap between the plates while exchanging heat. A plate-type absorber of an absorption refrigerator for absorbing steam, wherein a recessed portion which becomes a concave portion on an outer surface and becomes a convex portion on a side between the plate gaps is dispersed in a plate surface direction in the falling plate. And a plurality of inter-plate gap side protrusions of the recessed portion of the one falling plate and the inter-plate gap side protrusions of the recessed portion of the other falling plate in the other falling plate, or On the other hand, the convex portion on the gap side between the plates of the recessed portion in the falling plate is Wherein in contact with the plane portion of the flow-down plate, the plate type absorber of the absorption refrigerator of the flow path of the cooling fluid in the plates gap it is subdivided. 5. The brazing between the inter-plate gap side protruding portions of the recessed portions that are brought into contact with each other, or the planar portion of the other flow-down plate is brazed and connected to the inter-plate gap side protruding portions of the depressed portion. The plate type absorber of the absorption refrigerator according to claim 4, wherein 6. An opposing contact portion between the inter-plate gap side protrusions of the dent portion, or a contact portion between the inter-plate gap side protrusion of the dent portion and a flat portion of the other flow-down plate, The plate-type absorber of an absorption refrigerator according to claim 4 or 5, wherein the plate-type absorber is arranged in a staggered shape when viewed from a plate surface.