JPH11337226A - Integration type heat exchanger combining evaporator, absorber and supercooler and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method which achieves a high quality at a lower cost along with a higher performance and a smaller size in an integration type heat exchanger of an evaporator, an absorber and a supercooler for an absorption refrigerating machine. SOLUTION: A casing 2 of an integration combination type heat exchanger 1 is provided with two parts 3 and 4 and these parts are made to communicate through an upper communication path 5 or separated through a heat insulating gap B below the communication path 5. An evaporator 6 is housed in one casing part 3 while an absorber 7 in the other casing part 4 and a superheater 8 is arranged sideways across over upper parts of the evaporator 6 and the absorber 7 crossing the path 5. In an integration heat type exchanger 1 of the evaporator 6, the absorber 7 and the supercooler 8 thus arranged, the casing 2 is constituted of a hollow case with a roughly U-shaped vertical cross section and both ends thereof opened and two lid plates for closing openings at both ends of the hollow case. One leg part side surrounding wall of the hollow case is made as the casing part 3 while the other surrounding wall as the other casing part 4 and a part of linking both legs is made as the communication path 5. Extruding work is multiplied in use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated heat exchanger comprising a combination of an evaporator, an absorber and a subcooler used in an absorption refrigerator, and a method for producing the same. Combined integrated heat exchanger with evaporator, absorber and subcooler that can be downsized, and its inexpensive,
And a manufacturing method that provides high quality.

[0002]

2. Description of the Related Art Conventionally, evaporators, absorbers, subcoolers and the like of absorption refrigerators are often constituted by tubular heat exchangers. ,
Installed inside the body of a single-body or twin-body absorption refrigerator, or installed independently outside the body, between each other,
It is connected by a passage in the fuselage or by piping.

[0003] Therefore, in the production of an absorption refrigerator, heat exchangers such as an evaporator, an absorber, and a subcooler are separately manufactured, and these are individually attached and fixed inside or outside the body. , And then perform the required plumbing,
A lot of additional work is required, such as installing a partition plate.
The production and assembly of these heat exchangers, and the production of the heat exchanger part of the absorption chiller, are troublesome, and furthermore, there have been problems such as an increase in the size and complexity of the structure.

[0004] The applicant of the present invention has previously filed a patent application for the invention of an integrated heat exchanger combining an evaporator, an absorber and a subcooler as described below in order to solve these problems. (Japanese Patent Application No. 9-34963).

That is, according to the present invention, the evaporator, the absorber and the subcooler are each constituted by a multi-plate heat exchanger. A plurality of elements formed by laminating plate-like bodies are overlapped, the space inside each element is used as a passage for passing one heat transfer medium, and the space between each element is passed through the other heat transfer medium. The subcooler is formed integrally with the evaporator or the upper part of the absorber in a continuous manner, and the absorber, the integrally formed evaporator and the subcooler, An evaporator, an absorber and a subcooler are combined and integrated into a multi-plate heat exchanger, which is accommodated in a casing separated by a partition plate, assembled together, and then brazed. .

According to the present invention, the above problems can be solved to a sufficiently satisfactory degree, but on the other hand, the recovery of heat possessed by the evaporated refrigerant (refrigerant vapor) generated in the evaporator is still insufficient. However, since the temperature of the condensed refrigerant exiting the supercooler does not drop sufficiently, the cooling performance of the brine and the absorption performance of the evaporated refrigerant cannot be said to be sufficiently satisfactory, and there is still a point to be improved. .

[0007] Further, a wasteful space is formed above the evaporator or the absorber on the side where the supercooler is not connected to the upper part thereof, and the structure of the heat exchanger is correspondingly increased, so that it is still used. There was room for miniaturization.

The invention of the present application solves these problems and makes it possible to improve the heat exchange performance and further reduce the size of the structure, thereby improving the coefficient of performance of the absorption refrigerator and further reducing the size of the structure. It is an object of the present invention to provide a combined heat exchanger with a combination of an evaporator, an absorber and a subcooler, and to provide a method for producing such a combined heat exchanger at low cost and high quality.

[0009]

SUMMARY OF THE INVENTION The present invention relates to an integrated heat exchanger combining an evaporator, an absorber and a subcooler, and a method of manufacturing the same, which has solved the above-mentioned problems. According to the invention described in Item 1, the casing of the combined integral heat exchanger includes two casing portions, wherein the two casing portions are communicated via an upper communication passage, and the adiabatic gap below the communication passage is provided. And an evaporator is accommodated in one of the two casing portions, an absorber is accommodated in the other casing portion, and a subcooler is provided across the communication passage. An evaporator, an absorber, and a supercooler combined and integrated heat exchanger horizontally disposed so as to straddle the upper part of the evaporator and the upper part of the absorber, wherein the casing is viewed in a vertical sectional view. Abbreviation It is constituted by a U-shaped hollow case having both ends opened, and two lid plates for closing the openings at both ends of the hollow case. The peripheral wall on the leg side is the one casing part, and the peripheral wall on the other leg side is
An integrated heat exchanger comprising a combination of an evaporator, an absorber, and a subcooler, wherein the space that is the other casing portion and connects the two legs is the communication path.

The invention described in claim 1 is configured as described above, and the heat exchanger integrated with the combination of the evaporator, the absorber and the supercooler has the following structure. That is, the casing of the combined integrated heat exchanger is
Two casing parts, which are communicated via an upper communication passage and separated by an adiabatic gap below the communication passage, and one of the two casing parts An evaporator is accommodated, an absorber is accommodated in the other casing part, and a supercooler is arranged to cross the communication path and to span the upper part of the evaporator and the upper part of the absorber. It is arranged horizontally.

As a result, the heat transfer area of the subcooler can be made sufficiently large, and the condensed refrigerant flowing in the subcooler and the evaporative refrigerant generated in the evaporator have a cross-flow heat flow. Since the heat exchange between the evaporator and the absorber can be prevented due to the heat exchange between the evaporator and the absorber due to the heat exchange between the evaporator and the absorber, the heat exchange can be performed. The heat exchange performance in the cooler is improved, and the brine cooling performance in the evaporator is improved, and the absorption of the evaporated refrigerant in the absorber is promoted, so that the coefficient of performance of the absorption refrigerator is improved.

[0012] Further, no empty space is generated in the space above the evaporator and the absorber, and the space efficiency is improved. Further, the structure of the combined heat exchanger of the evaporator, the absorber and the subcooler is further improved. , And further downsizing of the structure of the absorption refrigerator.

The supercooler, which is disposed horizontally across the communication path between the two casing portions and spans the upper part of the evaporator and the upper part of the absorber, functions as an eliminator. The droplets contained in the evaporative refrigerant generated in the evaporator are separated to prevent the evaporative refrigerant from leaving the evaporator with the droplets. It prevents well from being mixed into the evaporator side by rebound.

Further, the casing of the combined integral heat exchanger having the above-mentioned effects has a hollow case having a substantially inverted U-shape in vertical cross section and both ends opened, and an opening at both ends of the hollow case. A peripheral wall on one leg side of the hollow case, which is substantially inverted U-shaped in a vertical cross section, is the one casing portion, and the other leg side is the same. Peripheral vessel wall is the other casing part,
Since the space connecting the two legs is used as the communication path, the manufacture of the casing is extremely easy, and the manufacture of the combined heat exchanger including the evaporator, the absorber and the subcooler is extremely easy. Very easy.

According to the second aspect of the present invention, since the hollow case is formed integrally by extrusion, the manufacture of the casing is further facilitated, and furthermore, the evaporation is achieved. The manufacture of a combined heat exchanger with a combined absorber, absorber and subcooler is further facilitated.

According to the third aspect of the present invention, the evaporator and the absorber are constituted by a multi-plate heat exchanger, and the subcooler is Since each of the heat exchangers is constituted by a flat fin-and-tube heat exchanger, the individual heat exchangers can be easily manufactured by using brazing means.

Further, the invention according to claim 4 comprises the following steps (1) to (4): The heat exchanger according to claim 1, further comprising a combination of an evaporator, an absorber and a supercooler. It is a manufacturing method. The hollow case is formed integrally by extrusion, and the two lid plates are formed by pressing. A spray pipe for the condensed refrigerant, a spray pipe for the concentrated absorption liquid, and an outlet pipe for the diluted absorption liquid are integrally fixed to a predetermined portion of the hollow case by brazing, and either one or both of the two cover plates are fixed. The bosses for mounting various sensors are integrally fixed at predetermined locations by brazing. The core part of the evaporator is assembled in the space on one leg side of the hollow case obtained in the step, the core part of the absorber is assembled in the space on the other leg side, and the subcooler is
Across the space connecting the two legs, it is assembled horizontally across the upper part of the evaporator and the upper part of the absorber, and a hollow case, various pipes, an evaporator, an absorber and Form a temporary subcooler assembly. In the temporary assembly obtained in the step, an inlet pipe and an outlet pipe of the brine to the evaporator, an inlet pipe and an outlet pipe of the cooling water to the absorber, and an inlet pipe of the condensed refrigerant to the subcooler and The outlet pipe is attached to each heat exchanger from the outside of the hollow case by passing through each mounting hole formed in the hollow case. The inlet and outlet pipes of the brine, the inlet and outlet pipes of the cooling water and the inlet and outlet pipes of the condensed refrigerant penetrate through the mounting holes formed in the hollow case, and are subjected to TIG welding. The tubes are connected to the evaporator, the absorber and the subcooler, respectively, and the hollow case is connected to the evaporator, the absorber and the subcooler, respectively. The two cover plates are respectively applied to the openings at both ends of the hollow case, and TIG welding is performed on the contact portions, and these openings are closed with the two cover plates.

According to a fourth aspect of the present invention, there is provided the above-mentioned structure, and the combination of the evaporator, the absorber and the subcooler according to the first aspect, which has various effects as described above. An exchanger is manufactured by the above steps.

As a result, the hollow case forming the casing of the combined integrated heat exchanger is formed at once by extrusion, and the two lid plates also forming the casing of the combined integrated heat exchanger are formed as follows. Each is formed by press working (step). Then, by using the hollow case thus obtained and the two cover plates to close the openings at both ends of the hollow case with the two cover plates, a casing can be formed. Is extremely easy to manufacture, and in turn, the manufacture of the combined integrated heat exchanger is very easy.

Also, since the number of parts constituting the casing is minimized, the number of parts that need to be connected to each other is reduced, and the casing can be configured to be robust accordingly. It can be constructed to be robust, and together with excellent heat exchange performance, a high-quality combined integrated heat exchanger can be obtained.

Further, in the above-mentioned steps or the like, the same kind of work for manufacturing the combined integrated heat exchanger is processed at the same time and proceeds to the next same kind of work, so that the work efficiency is improved, Productivity can be improved and manufacturing costs can be reduced.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claims 1 to 4 of the present application shown in FIGS. 1 to 6 will be described below. FIG. 1 is a front view of a combined integrated heat exchanger of an evaporator, an absorber, and a subcooler according to the present embodiment, in which a front cover plate is cut away, and FIG. 2 is a combined integrated heat exchanger of FIG. FIG. 3 is a view for explaining a manufacturing method of a hollow case constituting the casing of FIG. 1, FIG. 3 is a view showing one manufacturing process of the combined integrated heat exchanger of FIG. 1, and FIG. FIG. 5 is an enlarged view of a brine inlet pipe connection part of the evaporator in FIGS. 1 and 4, showing a connection state between the evaporator and the brine inlet pipe by TIG welding and a connection state between the evaporator and the hollow case. FIG. 6 and FIG. 6 are right side views of main parts of FIG.

As shown in FIG. 1, a combined heat exchanger 1 comprising an evaporator 6, an absorber 7 and a subcooler 8 in this embodiment has a casing 2 having two casing parts 3, 4 These two casing parts 3, 4 are communicated via an upper communication path 5 therebetween, separated by an insulating gap B below the communication path 5, and faced to each other. Have been.

The two casing portions 3 and 4 are in the shape of a vertically long rectangular parallelepiped hollow container, and their shapes in a vertical sectional front view are vertically long rectangular shapes as shown in FIG. The left and right width of the other casing part 4 is larger than the left and right width of one casing part 3.

The communication passage 5 has two casing parts 3, 4
In the upper part between them, the shape is narrower than their internal space, and as will be described in detail later, the cross-sectional shape by a plane that is elongated in the direction perpendicular to the paper and parallel to the same direction is rectangular. It is formed and provided. And the container wall is formed integrally with the container walls of the two casing portions 3 and 4.

The adiabatic gap B is formed below the communication path 5 by opposing wall surfaces of the two casing portions 3 and 4 and a bottom wall 5 a of the communication path 5.
And a gap between the lower openings defined by the above, and this gap prevents heat transfer between the evaporator 6 and the absorber 7, which will be described later. It is desirable for the heat insulating gap B to be as narrow as possible within a range that does not hinder the extrusion of the hollow case 20 described later, in order to reduce the size of the combined integrated heat exchanger 1.

As described above, the evaporator 6 is accommodated in one of the casing portions 3 of the casing 2 composed of the two casing portions 3 and 4 and the vessel wall portion of the communication passage 5, and the other is provided. An absorber 7 is housed in the casing part 4. Although not shown in detail, the evaporator 6 and the absorber 7 are constituted by a multi-plate heat exchanger.

The supercooler 8 is disposed horizontally across the communication path 5 so as to span the upper part of the evaporator 6 and the upper part of the absorber 7. Although not shown in detail, the subcooler 8 is constituted by a flat radiator type fin-and-tube heat exchanger.

In the subcooler 8, a portion slightly rightward from the center in FIG. 1 is supported by the bottom wall 5a of the communication passage 5, and a header portion on the left side thereof connects the condensed refrigerant inlet pipe 8a. The header part on the right side is supported on the side wall of one casing part 3 via an outlet pipe 8b for condensed refrigerant. An inlet pipe 8a and an outlet pipe 8b for the condensed refrigerant pass through the side walls of the casing portions 4 and 3 in an airtight manner.

In one casing part 3, the space between the right part of the subcooler 8 and the evaporator 6 is filled with condensed refrigerant that has exited the subcooler 8 and has been decompressed by the expansion valve 9. A spray tube 10 is mounted airtightly through the side wall of one casing part 3. As the spray pipe 10, a T-shaped pipe may be used in addition to a straight pipe as shown in the figure.

In the other casing part 4, in the space between the left part of the supercooler 8 and the absorber 7, there is provided a spray pipe for a concentrated absorbent absorbed by exiting a regenerator (not shown). 11 is mounted through the side wall of the other casing part 4 in an airtight manner. As the spray pipe 11, a T-shaped pipe can be used in addition to the straight pipe as shown in the figure.

The brine flows into the evaporator 6 from an inlet pipe 12 below it and flows out from an outlet pipe 13 above it.
During this time, the condensation refrigerant sprayed from the spray pipe 10 takes away the heat of evaporation of the condensation refrigerant and is cooled.

Cooling water flows into the absorber 7 from an inlet pipe 14 below it, and flows out from an outlet pipe 15 above it. During this time, the concentrated absorbing liquid sprayed from the spray pipe 11 is supplied to the evaporator 6.
While absorbing the evaporative refrigerant (refrigerant vapor) generated in the above, it becomes a rare absorbing liquid and accumulates at the bottom of the other casing part 4. The diluted absorption liquid collected at the bottom is sent to the next-stage regenerator via the outlet pipe 16.

The evaporative refrigerant (temperature: 10 ° C.) generated in the evaporator 6 moves to the absorber 7 at the next stage and is first absorbed by the concentrated absorbent before the upper part of the one casing portion 3. in the spatial domain a _3, it flows in an upward direction perpendicular to the flow of the condensed refrigerant flowing rightward in the portions of the subcooler 8, do this and heat exchange.

Next, in the space area A ₄ above the other casing part 4, the condensed refrigerant flows in a downward direction orthogonal to the flow of the condensed refrigerant flowing in the left part of the supercooler 8, and exchanges heat with the condensed refrigerant. . In this manner, heat is exchanged between the evaporative refrigerant and the condensed refrigerant by the orthogonal counterflow method.

During this time, the temperature of the condensed refrigerant is reduced from 50 ° C. at the inlet to 35 ° C. at the outlet. This temperature is several degrees lower than in the case where the conventional combined-integral heat exchanger is used, and the cooling performance of the brine in the evaporator 6 is improved accordingly.

On the other hand, the temperature of the evaporated refrigerant exiting the right portion of the subcooler 8 rises to 20 ° C., and then the temperature of the evaporated refrigerant exiting the left portion and going to the absorber 7 rises to 40 ° C. Although this temperature has risen, this temperature is also several degrees lower than in the case where the conventional combined integrated heat exchanger is used, and the load on the cooling water of the absorber 7 is reduced accordingly, and the absorption efficiency is reduced. Have been improved.

Next, a method of manufacturing the combined heat exchanger 1 including the evaporator 6, the absorber 7, and the subcooler 8 in this embodiment will be described. This manufacturing method includes the following six steps.

First, as shown in FIG. 3, a hollow case 20 which is a component of the casing 2 and two cover plates 25, 25
And manufacture. The hollow case 20 has a substantially inverted U-shape when viewed in a vertical cross section, has both ends opened, and is formed by extrusion. The two lid plates 25, 25 are parts for closing the openings at both ends of the hollow case 20, and are formed by press working (step).

FIG. 2 shows one process in which the hollow case 20 is manufactured by extrusion. As shown in the figure, the hollow case 20 is made of an elongated U-shaped material 30 having an elongated vertical cross section and manufactured by extrusion.
Is obtained by cutting at the position of the cutting line L for each depth dimension of.

As described above, the casing 2 is formed by integrating the two casing portions 3, 4 and the wall of the communication passage 5 (see FIG. 1). After using the hollow case 20 and the two lid plates 25, 25 obtained as described above, the following steps 1 to 5 are assembled, and these are assembled, and the abutting portions are joined by TIG welding to be integrated. It is manufactured by Hollow case
Reference numeral 20 denotes a body part of the casing 2.

The casing 2 manufactured as described above
Is a vertical section U of the hollow case 20 forming the body portion.
The peripheral device wall on one leg portion 21 side is the one casing portion 3 described above, and the peripheral device wall on the other leg portion 22 side is the other casing portion 4 described above. The space E connecting the legs 21 and 22 of the communication passage 5
And used.

Then, as shown in FIG. 3, a spray pipe 10 of the condensed refrigerant is provided at a predetermined position of the hollow case 20.
The concentrated absorption liquid spray pipe 11 and the diluted absorption liquid outlet pipe 16 are integrally fixed by brazing. At the same time, bosses 17 for mounting various sensors are integrally fixed to one or both of the two cover plates 25, 25 at predetermined positions by brazing (step).

Next, the core portion of the evaporator 6 is assembled into the space C on the one leg 21 side of the hollow case 20 obtained in the process, and the core portion of the absorber 7 is inserted into the space D on the other leg 22 side. And the core portion of the supercooler 8 is placed horizontally across the space E between the legs 21 and 22 so as to straddle the upper portion of the evaporator 6 and the upper portion of the absorber 7. Assembling, as shown in FIG. 4, a temporary assembly of a hollow case 20, various pipes 10, 11, 16 (see FIG. 3 for the pipes 11, 16), an evaporator 6, an absorber 7, and a subcooler 8. Form a solid (step).

Next, in the temporary assembly obtained in the process, the inlet pipe 12 and the outlet pipe 13 of the brine to the evaporator 6, and the inlet pipe 14 and the outlet pipe 15 of the cooling water to the absorber 7.
(See FIG. 1) and an inlet pipe 8a and an outlet pipe 8b (see FIG. 1 for the inlet pipe 8a) of the condensed refrigerant to the subcooler 8 are formed in the hollow case 20 from outside the hollow case 20. Through each mounting hole, evaporator 6,
It is assembled to each pipe connecting portion of the absorber 7 and the subcooler 8 (step; see FIG. 4).

Next, the brine inlet tube 12 and outlet tube
13. TIG welding is performed on portions where the inlet pipe 14 and the outlet pipe 15 of the cooling water and the inlet pipe 8a and the outlet pipe 8b of the condensed refrigerant penetrate through the respective mounting holes formed in the hollow case 20. 12, 13, 14, 15, 8a and 8b are connected to the evaporator 6, the absorber 7 and the subcooler 8, respectively, and the hollow case 20 is connected to the evaporator 6, the absorber 7 and the subcooler 8 respectively. Combine (step).

FIGS. 5 and 6 show the inlet pipe 12 of the brine.
Is formed by performing TIG welding on a portion penetrating the mounting hole 23 formed in the hollow case 20 to connect the inlet pipe 12 and the evaporator 6 and to connect the hollow case 20 and the evaporator 6. Is shown.

As is apparent from these figures, the TIG welding is performed at two places where the inlet pipe 12 penetrates the mounting hole 23, and the TIG welding T _{i at} one of the places is performed.
Is provided at the base of the inlet pipe 12 where the inlet pipe 12 fits into the pipe connection portion of the evaporator 6, whereby the inlet pipe 12 and the evaporator 6 are connected.

The other part of the TIG weld T _o is formed at the corner where the inner peripheral surface of the mounting hole 23 and the outer surface of the side plate 24 of the evaporator 6 meet. The hollow case 20 and the evaporator 6 (the lower part thereof) are connected with each other.

The TIG welds T _i and T _o are determined by the outlet pipe 13 of another brine, the inlet pipe 14 and the outlet pipe 15 of the cooling water.
The same applies to a portion where the inlet pipe 8a and the outlet pipe 8b of the condensed refrigerant penetrate through the respective mounting holes formed in the hollow case 20, whereby each of these pipes 13, 14, 15 is formed. , 8a, 8b and the evaporator 6, the absorber 7, and the subcooler 8, respectively, and the hollow case 20 and the evaporator 6, the absorber 7, and the subcooler 8
Are respectively combined.

The TIG welds T _i and T _o may be combined and applied. In addition, each pipe 12, 13, 14, 15, 8a,
If the connection between the tube 8b and the evaporator 6, the absorber 7 and the subcooler 8 is made tight in a liquid-tight manner through a sealing means, each tube 12, 13, 14, 15, 8a, 8b and TIG welding may be performed only between the hollow case 20 and the hollow case 20 to connect the evaporator 6, the absorber 7, and the supercooler 8 to each other.

Finally, two lid plates 25, 25 are applied to the openings at both ends of the hollow case 20, respectively, and TIG welding is applied to the abutting portions, and these openings are closed with these two lid plates 25, 25. (Step). Thus, the manufacture of the combined integrated heat exchanger 1 including the evaporator 6, the absorber 7, and the subcooler 8 is completed.

As described above, the brazing employed in the method of manufacturing the integrated heat exchanger 1 combining the evaporator 6, the absorber 7, and the subcooler 8 is performed when the constituent material is _Fe or SUS. is C _u brazing or N _i brazing, and when construction material is a _l is normal Kuraddorou with is employed.

The integrated heat exchanger 1 comprising the combination of the evaporator 6, the absorber 7, and the subcooler 8 and the method of manufacturing the same according to the present embodiment have the following effects because they are configured as described above. be able to.

The combined heat exchanger 1 comprising the evaporator 6, the absorber 7 and the subcooler 8 has the following structure. That is, the casing 2 of the combined integrated heat exchanger 1
Is composed of two casing parts 3, 4, which are communicated via an upper communication passage 5 and are separated by an adiabatic gap B below the communication passage 5, An evaporator 6 is accommodated in one of the two casing parts 3, 4, an absorber 7 is accommodated in the other casing part 4, and a subcooler 8 crosses the communication passage 5. Thus, it is disposed horizontally so as to straddle the upper part of the evaporator 6 and the upper part of the absorber 7.

As a result, the heat transfer area of the subcooler 8 can be made sufficiently large, and the condensed refrigerant flowing in the subcooler 8 and the evaporative refrigerant generated in the evaporator 6 cross the orthogonally opposed flow. Type heat exchange can be sufficiently performed, and no heat transfer occurs between the evaporator 6 and the absorber 7 due to the adiabatic gap B below the communication path 5. The heat exchange performance in the portions (evaporator 6, absorber 7, subcooler 8) is improved, the cooling performance of brine in evaporator 6 is improved, and the absorption of the evaporated refrigerant in absorber 7 is promoted, and the absorption is improved. The coefficient of performance of the refrigerator is improved.

Further, there is no vacant space between the space area A ₃ above the evaporator 6 and the space area A ₄ above the absorber 7, and the space efficiency is improved.
It is possible to further reduce the size of the combined heat exchanger 1 including the absorber 7 and the subcooler 8, and further reduce the size of the absorption refrigerator.

The subcooler 8 is disposed horizontally across the communication path 5 of the two casing parts 3 and 4 so as to span the upper part of the evaporator 6 and the upper part of the absorber 7.
It functions as an eliminator, separates droplets contained in the evaporated refrigerant generated in the evaporator 6, prevents the evaporated refrigerant from leaving the evaporator 6 with the droplets,
The absorption liquid sprayed in the absorber 7 is prevented from being mixed into the evaporator 6 due to the rebound.

Further, the casing 2 of the combined integral type heat exchanger 1 having the above-mentioned effects has a hollow case 20 having a substantially inverted U-shape in longitudinal section and both ends opened, The hollow case 20 is constituted by two lid plates 25, 25, which close the openings at both ends. The peripheral wall on the side of the other leg 22 is the other casing part 4, and the space E connecting the two legs 21 and 22 is the communication path 5. 2 is extremely easy to manufacture, and thus, the heat exchanger 1 combined with the evaporator 6, the absorber 7 and the subcooler 8 is extremely easy to manufacture.

Further, since the hollow case 20 is integrally formed at a stroke by extrusion, the manufacture of the casing 2 is further facilitated, and furthermore, the combination of the evaporator 6, the absorber 7, and the subcooler 8 is reduced. The manufacture of the body heat exchanger 1 is further facilitated.

Further, since the number of parts constituting the casing 2 is minimized, the number of parts that need to be connected to each other is reduced, and the casing 2 can be made more robust accordingly. The heat exchanger 1 can be configured to be robust, and together with excellent heat exchange performance, a high-quality combined integrated heat exchanger 1 can be obtained.

Further, the evaporator 6 and the absorber 7 are constituted by a multi-plate heat exchanger, and the subcooler 8 is constituted by a flat fin-and-tube heat exchanger. By means of these, the manufacture of these individual heat exchangers can be facilitated.

Further, a method of manufacturing the combined heat exchanger 1 of the evaporator 6, the absorber 7, and the subcooler 8 exhibiting various effects as described above comprises the above-mentioned steps. In the step, the same type of work is processed at the same time, and the process proceeds to the next same type of work. Therefore, work efficiency is improved, productivity is improved, and manufacturing cost can be reduced.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a heat exchanger with an integrated combination of an evaporator, an absorber, and a subcooler in a cut-away view of a front cover plate according to an embodiment of the present invention described in claims 1 to 4 of the present application. FIG.

FIG. 2 is a view for explaining a method of manufacturing a hollow case constituting a casing of the combined integrated heat exchanger of FIG. 1;

FIG. 3 is a view showing one manufacturing process of the combined integrated heat exchanger of FIG. 1;

FIG. 4 is a view showing another manufacturing process.

FIG. 5 is an enlarged view of a brine inlet pipe connection part of the evaporator in FIGS. 1 and 4, showing a connection state of the evaporator and the brine inlet pipe by TIG welding and a connection state of the evaporator and the hollow case. FIG.

FIG. 6 is a right side view of a main part of FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Combined integrated heat exchanger, 2 ... Casing, 3 ... Casing part, 4 ... Casing part, 5 ... Communication path, 5a ...
Bottom vessel wall, 6 evaporator, 7 absorber, 8 supercooler, 8
a ... condensed refrigerant inlet pipe, 8b ... condensed refrigerant outlet pipe, 9 ... expansion valve, 10 ... condensed refrigerant spray pipe, 11 ... concentrated absorbent spray pipe, 12 ... brine inlet pipe, 13 ... brine outlet pipe, 14 ... cooling water Inlet pipe, 15 ... Cooling water outlet pipe, 16 ... Dilute absorbent outlet pipe, 17 ... Sensor mounting boss, 20 ... Hollow case, 21, 22 ... Reverse U-shaped leg, 23 ... Mounting hole, 24 ... Side plate, 25 ... cover plate, 30 ... hollow casing material, A _3, A ₄ ... spatial domain, B ... insulation gap, C to E
... space, L ... cutting line, T _i, T _o ... TIG welds.

Continuing on the front page (72) Inventor Tsutomu Wada 3-25-3 Yoyogi, Shibuya-ku, Tokyo Toyo Radiator Co., Ltd. (72) Inventor Mitsuru Ishikawa 1-4-1 Chuo, Wako-shi, Saitama Japan Honda Motor Co., Ltd. Inside the laboratory (72) Inventor Tohru Fukuda 1-4-1 Chuo, Wako-shi, Saitama Prefecture Inside Honda Technical Research Institute (72) Inventor Kazuma Ichikawa 1-4-1 Chuo, Wako-shi, Saitama Honda Inc. Inside the Technical Research Institute

Claims (4)

[Claims] 1. The casing of a combined integral heat exchanger,
Two casing portions, wherein the two casing portions are communicated via an upper communication passage and are separated by an adiabatic gap below the communication passage, and one of the two casing portions is provided. An evaporator is accommodated in the casing, and an absorber is accommodated in the other casing, and a subcooler is provided across the communication path and over the upper part of the evaporator and the upper part of the absorber. In a combined integrated heat exchanger of an evaporator, an absorber and a subcooler arranged horizontally, the casing has a substantially inverted U-shape in longitudinal section and a hollow case having both ends opened; And two cover plates for closing the openings at both ends of the hollow case, and the peripheral casing wall on one leg side of the hollow case in a substantially inverted U-shape in longitudinal section is the one casing part. , On the other leg side Wherein the peripheral wall is the other casing part, and the space connecting the two legs is the communication path, wherein the combined heat of the evaporator, the absorber and the subcooler is integrated. Exchanger. 2. The combined heat exchanger according to claim 1, wherein the hollow case is formed integrally by extrusion. 3. The heat exchanger according to claim 1, wherein the evaporator and the absorber are constituted by a multi-plate heat exchanger, and the subcooler is constituted by a flat fin-and-tube heat exchanger. An integrated heat exchanger comprising a combination of the evaporator, the absorber and the subcooler according to claim 1 or 2. 4. The method according to claim 1, wherein the method comprises the following steps (1) to (4): The hollow case is formed integrally by extrusion, and the two lid plates are formed by pressing. A spray pipe for the condensed refrigerant, a spray pipe for the concentrated absorption liquid, and an outlet pipe for the diluted absorption liquid are integrally fixed to a predetermined portion of the hollow case by brazing, and either one or both of the two cover plates are fixed. The bosses for mounting various sensors are integrally fixed at predetermined locations by brazing. The core part of the evaporator is assembled in the space on one leg side of the hollow case obtained in the above step, the core part of the absorber is assembled in the space on the other leg side, the core part of the subcooler, Across the space connecting the two legs, it is assembled horizontally across the upper part of the evaporator and the upper part of the absorber, and a hollow case, various pipes, an evaporator, an absorber and Form a temporary subcooler assembly. In the temporary assembly obtained in the step, an inlet pipe and an outlet pipe of the brine to the evaporator, an inlet pipe and an outlet pipe of the cooling water to the absorber, and an inlet pipe of the condensed refrigerant to the subcooler and The outlet pipe is attached to each heat exchanger from the outside of the hollow case by passing through each mounting hole formed in the hollow case. The inlet and outlet pipes of the brine, the inlet and outlet pipes of the cooling water and the inlet and outlet pipes of the condensed refrigerant penetrate through the mounting holes formed in the hollow case, and are subjected to TIG welding. The tubes are connected to the evaporator, the absorber and the subcooler, respectively, and the hollow case is connected to the evaporator, the absorber and the subcooler, respectively. The two cover plates are respectively applied to the openings at both ends of the hollow case, and TIG welding is performed on the contact portions, and these openings are closed with the two cover plates.