JPH07190651A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the leakage of solution out of a solution heat exchanger for a double-effect absorption type refrigerating machine, which is constituted of a plurality of formed plates laminated in the thickness direction of the plate, and eliminate trouble due to the leak-out of the solution. CONSTITUTION:A heat exchanger main body 2, in which heat exchange between high-temperature concentrated solution and low-temperature dilute solution is effected, is formed by laminating a plurality of first and second formed plates 4, 5 alternately in the thickness direction of the plate without employing any connecting means such as welding, brazing or the like. The circumference of the heat exchanger main body 2 is covered by a sealed box 3, consisting of a vessel main body 61 and a lid member 62, to make the inside and the outside of the main body air tight. According to this method, even when solution is leaked between neighboring first and second formed plates 4, 5 preliminarily, the leaked solution will never leak out of the sealed box 3 while air will, never invade into the heat exchanger main body 2. Accordingly, a pressure in a refrigerating instruments, such as an evaporator or the like in the doubleeffect absorption type refrigerating machine, will never rise whereby the deterioration of capacity can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger having a heat exchanger body formed by laminating a plurality of molded plates, for example, which is incorporated in an absorption refrigerator and has a high temperature solution and a low temperature solution. The present invention relates to a heat exchanger suitable as a solution heat exchanger for exchanging heat.

[0002]

2. Description of the Related Art Conventionally, a double-effect absorption refrigerator (for example, Japanese Patent Laid-Open No. 2-263066) is known. This double-effect absorption refrigerator has cold water or hot water obtained by operatively connecting a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator and an absorber with a refrigerant pipe and a solution pipe. It is designed to be used for cooling or heating.

Further, in the double-effect absorption refrigerator, the high temperature concentrated solution heated in the low temperature regenerator is guided to the absorber through the solution pipe. Then, in order to facilitate the absorption of the refrigerant in the solution by lowering the temperature of the high temperature concentrated solution in the middle of the solution piping, heat is exchanged with the low temperature dilute solution which is pressure-fed from the absorber to the high temperature regenerator. Further, the high temperature medium concentration solution which is led from the high temperature regenerator to the low temperature regenerator and the low temperature dilute solution which is led to the high temperature regenerator are heat-exchanged.

As described above, as a solution heat exchanger for exchanging heat between a high temperature concentrated solution or the like and a low temperature dilute solution, a solution heat exchanger 100 as shown in FIG. 21 has been conventionally used. In this solution heat exchanger 100, a plurality of forming plates 101 formed by drawing and the like are provided with respective communication holes 102.
Heat exchanger body 10 stacked so that the plates communicate with each other in the plate thickness direction
3, a top plate 105 provided on the upper part of the heat exchanger main body 103, to which an inlet / outlet pipe 104 for a high temperature concentrated solution and a low temperature dilute solution is attached, and a bottom plate 106 provided on the lower part of the heat exchanger main body 103. It consists of and.

A top plate 105 and a bottom plate 106 are joined to the upper and lower ends of the heat exchanger body 103 via spacers 107 and 108. And the solution heat exchanger 1
In No. 00, since each part is formed of stainless steel having excellent heat resistance and corrosion resistance, vacuum brazing using nickel brazing is adopted as a joining means of each part.

[0006]

However, in the conventional solution heat exchanger 100, since nickel brazing is used as the brazing material, the temperature of vacuum brazing becomes extremely high (for example, 1200 ° C.). Since the brazing is gradually cooled at room temperature after the brazing, the metal crystals in the brazing part of each component are coarsened. Therefore, the solution heat exchanger 1
When 00 was used for a long period of time, there was a possibility that the brazed portion would be corroded, such as rust occurring in the brazed portion. In particular, when the solution is a highly corrosive solution such as a lithium bromide solution, the above problems become more remarkable.

[0007] Generally, the evaporator and the absorber are provided in the same shell, and the internal pressure of the shell is maintained at a low pressure (almost vacuum) much lower than atmospheric pressure. Since the double-effect absorption refrigerator is operated in a closed cycle closed to the outside, a heat exchanger for exchanging heat between a high temperature concentrated solution and a low temperature dilute solution is difficult to leak to the outside. There was a limit.

That is, when corrosion occurs in the brazed portion as described above, the concentrated solution or the diluted solution leaks to the outside, and the air intrudes into the heat exchanger from the outside, and the evaporator is correspondingly leaked. In the steady state (for example, 5 mmHg), the boiling point was 5 ° C, but the internal pressure in the shell rises, the boiling point also rises, and it becomes difficult for the refrigerant to evaporate. There was a problem that it reduced the ability.

An object of the present invention is to provide a heat exchanger capable of preventing external leakage of fluid for heat exchange.

[0010]

According to a first aspect of the present invention, there is provided a heat exchanger main body which comprises a plurality of parts and which exchanges heat of a fluid.
A technical means is adopted which covers the periphery of the heat exchanger body and includes a closed box that hermetically partitions the inside and the outside. The heat exchanger body may be composed of two tanks and a plurality of tubes connecting these tanks, or a plate fin or a corrugated fin joined inside and outside the tubes.

According to the invention of claim 2, the plurality of members are a plurality of molded plates formed by molding metal plates having excellent heat resistance and corrosion resistance, and each of these molded plates has a plate thickness. A communication hole passing through in the direction is formed.

According to the third aspect of the present invention, the heat exchanger main body is formed by stacking the plurality of molding plates such that the communication holes of the plurality of molding plates communicate with each other in the plate thickness direction. A plurality of fluid passages communicating with the communication holes are formed in the plate length direction or the plate width direction of the plate.

According to the invention of claim 4, the closed box is
The container main body is formed of a metal having excellent heat resistance and corrosion resistance, and has one end opened, and a lid member that closes the opening of the container body, and the end portion on the opening side of the container body and the peripheral portion of the lid member. And are joined using a joining means such as fusion welding, pressure welding or brazing.

[0014]

According to the first aspect of the present invention, since the heat exchanger body is covered with the closed box, even if the fluid for heat exchange leaks between the plurality of parts, the outside of the closed box There is no leakage.

According to the second and third aspects of the invention, since the heat exchanger body is covered with the closed box,
Even if the fluid for heat exchange leaks between the two adjacent molding plates, it does not leak out of the sealed box.

According to the fourth aspect of the invention, the opening-side end of the container body and the peripheral portion of the lid member are joined by using a joining means such as fusion welding, pressure welding or brazing. There is no adverse effect such as the promotion of rust or corrosion due to the joining means to the parts such as the plurality of molded plates constituting the heat exchanger body.

[0017]

EXAMPLE A heat exchanger of the present invention will be described based on an example applied to a solution heat exchanger for an absorption refrigerator.

[Structure of First Embodiment] FIGS. 1 to 11 show a first embodiment of the present invention.
FIG. 4 is a diagram showing a solution heat exchanger for a double-effect absorption refrigerator.

The solution heat exchanger 1 is a heat exchanger body 2 for cooling the concentrated solution by heating and exchanging the concentrated solution having a high temperature and a diluted solution having a low temperature, for example, an aqueous solution of lithium bromide.
Also, a closed box 3 that covers the periphery of the heat exchanger body 2 is provided.

The heat exchanger main body 2 is formed by alternately stacking a plurality of first molding plates 4 and second molding plates 5 so that a high temperature concentrated solution flows through the inside of the first flow passage pipe 6 and a low temperature inside the inside thereof. Second flow path pipes 7 through which the dilute solution flows are formed alternately.

Now, the structure of the first molding plate 4 used in this embodiment will be described in detail with reference to FIGS. The first molding plate 4 is a component of the present invention, and is formed by drawing a metal plate (for example, a plate thickness of 0.3 mm) such as stainless steel having excellent heat resistance and corrosion resistance to form a second molding plate 5. It is provided with a substantially rectangular plate wall portion 12 having a corrugated portion 11 that forms a flow path in which the solution meanders in the plate length direction and the plate width direction. As shown in FIGS. 4 to 6, the tubular side wall portion 13 bent from the periphery of the plate wall portion 12 is formed to have a predetermined inclination angle with respect to the surface direction of the plate wall portion 12. There is.

As shown in FIG. 4, the corrugated portion 11 has
A plurality of concave portions 14 and convex portions 15 having a height difference of, for example, about 1.2 mm are formed. The concave portions 14 and the convex portions 15 are provided so as to be alternately repeated from the left side in the drawing to the right side in the drawing in FIG. 4. Further, the extending direction of the plurality of concave portions 14 and the extending direction of the plurality of convex portions 15 are inclined by a predetermined angle with respect to the plate length direction of the first forming plate 4.

Further, as shown in FIGS. 5 and 6, diagonal walls 16 and 17 are provided at both ends of the plate wall portion 12 in the plate length direction.
Are formed. The oblique walls 16 and 17 form a step difference of, for example, about 1.2 mm between the adjacent flat plate portions 18 and 19 and the flat plate portions 20 and 21, and the adjacent flat plate portions 1
It also functions as a partition part that partitions between 8 and 19 and between the flat plate parts 20 and 21. The flat plate portions 18 and 21 are provided so as to be lower than the flat plate portions 19 and 20.

A circular first outlet hole 22 through which the high-temperature concentrated solution passes and a circular second inlet hole 23 through which the low-temperature dilute solution passes through the flat plate portions 18 and 19 in the plate thickness direction. Is formed by burring. The first outlet hole 22 and the second inlet hole 23 together form the communication hole of the present invention.

The area around the first outlet hole 22 is shown in FIG.
As shown in, the annular burring portion 24 is formed so as to be recessed from the surrounding flat plate portion 18. In addition, as shown in FIGS. 4 and 5, around the second inlet hole 23,
The annular burring portion 25 has a protrusion amount equal to or less than the recess amount of the burring portion 24, and the flat plate portion 19 around the protrusion amount.
It is formed so as to project further.

As shown in FIG. 6, the flat plate portions 20 and 21 have a circular second outlet hole 26 through which a low temperature dilute solution passes,
And the circular first inlet hole 27 through which the high temperature dilute solution passes
Are formed by burring so as to penetrate in the plate thickness direction. The second outlet hole 26 and the first inlet hole 27 are
Together, they constitute the communication hole of the present invention.

An annular burring portion 28 is formed around the second outlet hole 26 so as to protrude from the surrounding flat plate portion 20 as shown in FIG. Also, the first
Around the inlet hole 27, as shown in FIGS. 4 and 6, the annular burring portion 29 has a recessed portion equal to or larger than the protruding amount of the burring portion 28, and the surrounding flat plate portion 2.
It is formed so as to be recessed from 1.

Now, the structure of the second molding plate 5 used in this embodiment will be described in detail with reference to FIGS. 7 to 10. The second molding plate 5 is a component of the present invention, and is made of the same metal material as the first molding plate 4,
A substantially square plate wall portion 32 having a corrugated portion 31 that forms a flow path in which the solution meanders between the corrugated portion 11 of the molding plate 4 is provided. Around the plate wall portion 32, as shown in FIGS. 8 to 10, a cylindrical side wall portion 33 similar to the side wall portion 13 of the first forming plate 4 is formed.

As shown in FIG. 8, the corrugated portion 31 has
A plurality of convex portions 34 and concave portions 35 similar to those of the first molding plate 4 are formed. The convex portion 34 and the concave portion 35 are shown in FIG.
In the figure, the arrangement is alternately repeated from the left side of the drawing toward the right side of the drawing. Further, the extending direction of the plurality of convex portions 34 and the extending direction of the plurality of concave portions 35 are inclined in the opposite directions to the extending direction of the concave portions 14 and the convex portions 15 of the first molding plate 4. Therefore, the concentrated solution or the dilute solution is formed between the corrugated portion 11 of the first molding plate 4 and these concave portions 1
The heat exchange performance is excellent because the parts 4 and 35 and the convex parts 15 and 34 flow like sewing.

Further, similar to the first molding plate 4, at both ends of the plate wall portion 32 in the plate length direction, as shown in FIGS. 9 and 10, the slanted walls 36, 37 and the flat plate portions 38, 39 are formed. And flat plate portions 40 and 41 are formed. The flat plate portions 39 and 40 are provided so as to be lower than the flat plate portions 38 and 41.

A circular first outlet hole 42 through which the high-temperature concentrated solution passes and a circular second inlet hole 43 through which the low-temperature dilute solution passes through the flat plate portions 38 and 39 in the plate thickness direction. Is formed by burring. The first outlet hole 42 and the second inlet hole 43 together form a communication hole of the present invention.

As shown in FIG. 9, an annular burring portion 44 is formed around the first outlet hole 42 so as to protrude from the surrounding flat plate portion 38. The burring portion 44 is in contact with the burring portion 24 of the first molding plate 4 which is adjacent to the upper side of the flat plate portion 38 in FIG.

Further, around the second inlet hole 43, as shown in FIGS. 8 and 9, the annular burring portion 45 is surrounded by a depression amount equal to or larger than the protrusion amount of the burring portion 44. It is formed so as to be recessed from the flat plate portion 39. The burring portion 45 is in contact with the burring portion 25 of the first molding plate 4 adjacent to the flat plate portion 39 on the lower side in FIG.

As shown in FIG. 10, the flat plate portions 40 and 41 communicate with the circular second outlet hole 46 communicating with the second outlet hole 26 of the first molding plate 4 and the first inlet hole 27. The circular first inlet hole 47 is formed by burring so as to penetrate in the plate thickness direction. Second outlet hole 4
6 and the 1st inlet hole 47 together comprise the communicating hole of this invention.

The area around the second outlet hole 46 is shown in FIG.
As shown in FIG. 5, the annular burring portion 48 is formed so as to be recessed from the flat plate portion 40 around it. The burring portion 48 is in contact with the burring portion 28 of the first molding plate 4 which is adjacent to the lower side of the flat plate portion 40 in FIG.

Around the first inlet hole 47, as shown in FIGS. 8 and 10, an annular burring portion 49 is formed.
Is formed so as to protrude from the surrounding flat plate portion 41 by a protrusion amount equal to or smaller than the recess amount of the burring portion 48. The burring portion 49 is in contact with the burring portion 29 of the first molding plate 4 which is adjacent to the flat plate portion 41 on the upper side in FIG.

As shown in FIG. 11, the plurality of first flow path pipes 6 are composed of adjacent first and second molding plates 4 and 5. These first flow path pipes 6 are connected to the respective first inlet holes 2
By laminating 7 and 47 and the respective first outlet holes 22 and 41 so as to communicate with each other in the laminating direction, the surface of the corrugated portion 11 of the first molding plate 4 and the corrugated portion 31 of the second molding plate 5 are formed. A plurality of first fluid passages 51 through which the concentrated solution flows are formed between the back surface and the back surface.

The basic flow of the concentrated solution in the heat exchanger body 2 is as shown in FIG.
First inlet hole 27 of → the first inlet hole 4 of the second forming plate 5
7 → first fluid passage 51 → first outlet hole 42 of second forming plate 5 → first outlet hole 22 of first forming plate 4.

As shown in FIG. 11, the plurality of second flow path pipes 7 are composed of the adjacent second and first molding plates 5 and 4. These second flow path pipes 7 are connected to the respective second inlet holes 2
By laminating 3 and 43 and the respective second outlet holes 26 and 46 so as to communicate with each other in the laminating direction, the back surface of the corrugated portion 11 of the first molding plate 4 and the corrugated portion 31 of the second molding plate 5 can be formed. A plurality of second fluid passages 52 through which the dilute solution flows are formed between the second fluid passages 52 and the surface.

The basic flow of the dilute solution in the heat exchanger body 2 is, as shown in FIG.
Second inlet hole 43 of → the second inlet hole 2 of the first forming plate 4
3 → second fluid passage 52 → second outlet hole 26 of first forming plate 4 → second outlet hole 46 of second forming plate 5.

Here, as shown in FIG. 1, in the ceiling side plate 53 and the bottom side plate 54 of the heat exchanger main body 2, the plate wall portions 55 and 56 are all formed in a flat shape, and the heat exchanger main body is formed. By increasing the contact area between the closed box 3 and the closed box 3, rattling of the heat exchanger body 2 in the closed box 3 is prevented.

As shown in FIG. 1, the closed box 3 is composed of a container body 61 and a lid member 62, and hermetically separates the inside from the outside. The container body 61 is made of a metal plate such as stainless steel or other nickel alloy having excellent heat resistance and corrosion resistance. The container body 61 has tubular side wall portions 63 that surround the sides of the heat exchanger body 2. An opening 64 is formed at one end of the side wall 63, and a rectangular bottom wall 65 is integrally formed at the other end.

On the inner side surface of the side wall portion 63, the side wall portions 13 of the plurality of first forming plates 4 of the heat exchanger main body 2, the side wall portions 33 of the plurality of second forming plates 5, the ceiling side plate 53. Side wall portion 57 and the side wall portion 5 of the bottom plate 54
8 is in close contact.

On the inner surface of the bottom wall portion 65, the heat exchanger body 2
The back surface of the plate wall portion 56 of the bottom side plate 54 is in close contact. Then, in the peripheral portion of the bottom wall portion 65, the side walls 13 of the first and second forming plates 4 and 5 and the bottom side plate 54,
Bent portion 66 bent to escape from 33, 58
Are formed.

The lid member 62 is made of the same metal material as the container body 61. The lid member 62 closes the opening 64 of the container body 61, and has the first and second inlet pipes 67 and 69 and the first and second outlet pipes 68 and 70 attached thereto. The cylindrical standing wall portion 7 is provided around the lid member 62.
1 is bent and formed. Further, the lid member 62 is formed with a first inlet hole 72, a second inlet hole 73, a first outlet hole 74 and a second outlet hole 75 (see FIG. 11).

The first inlet pipe 67 is formed in a circular tube shape with a metal material such as stainless steel or other nickel alloy having excellent heat resistance and corrosion resistance. The first inlet pipe 67 is
It is for allowing a high-temperature concentrated solution to flow into the heat exchanger main body 2, and has an annular flange portion 76 at the end portion on the lid member 62 side. Inside the first inlet pipe 67, the lid member 6
Through the first inlet hole 72 of the second heat exchanger main body 2,
It communicates with the respective first inlet holes 27, 47 of the second molding plates 4, 5.

The first outlet pipe 68 is made of the same metal material as the first inlet pipe 67 and has the same shape. The first outlet pipe 68 is for allowing the high temperature concentrated solution to flow out from the heat exchanger body 2, and has an annular flange 77 at the end on the lid member 62 side. The inside of the first outlet pipe 68 communicates with the first outlet holes 22, 42 of the first and second molding plates 4, 5 of the heat exchanger body 2 via the first outlet holes 74 of the lid member 62. is doing.

The second inlet pipe 69 is made of the same metal material as the first inlet pipe 67 and has the same shape. The second inlet pipe 69 is for allowing a low temperature dilute solution to flow into the heat exchanger body 2, and has an annular flange portion 78 at the end portion on the lid member 62 side. The inside of the second inlet pipe 69 communicates with the second inlet holes 23 and 43 of the first and second molding plates 4 and 5 of the heat exchanger body 2 through the second inlet holes 73 of the lid member 62. is doing.

The second outlet pipe 70 is made of the same metal material as the first inlet pipe 67 and has the same shape. The second outlet pipe 70 is for allowing the low temperature dilute solution to flow out from the heat exchanger body 2, and has an annular flange portion 79 at the end portion on the lid member 62 side. The inside of the second outlet pipe 70 communicates with the second outlet holes 26, 46 of the first and second molding plates 4, 5 of the heat exchanger body 2 via the second outlet holes 75 of the lid member 62. is doing.

[Manufacturing Method of First Embodiment] A method of assembling the solution heat exchanger 1 of this embodiment will be briefly described with reference to FIGS. 1 to 10.

The plurality of first molding plates 4, the plurality of second molding plates 5, the ceiling side plate 53 and the bottom side plate 54 are formed into a predetermined shape by press molding or the like, and the container body 61 and the lid member 62 are pressed. It is formed into a predetermined shape by molding or the like.

The heat exchanger main body 2 is formed by alternately stacking a plurality of first molding plates 4 and second molding plates 5 between the ceiling side plate 53 and the bottom side plate 54. Then, on the surface of the lid member 62, the flange portions 76 to 79 of the first and second inlet pipes 67 and 69 and the first and second outlet pipes 68 and 70 are joined by joining means such as TIG welding or brazing. To join.

Here, the side walls 13, 33, 57 and 58 of the plurality of first molding plates 4, the plurality of second molding plates 5, the ceiling side plate 53 and the bottom side plate 54 are press-fitted into the container body 61. Prior to this, the opening is larger than the opening area of the container body 61. Then, the side wall portions 13, 33,
While narrowing 57 and 58, the heat exchanger main body 2 is connected to the container main body 6
When press-fitted in 1, the side walls 13, 33, 57, 58 are elastically deformed by the spring action of the side walls 13, 33, 57, 58.
3, 57 and 58 come into close contact with the inner surface of the side wall portion 63 of the container body 61, so that a desired sealing property is secured.

Then, the lid member 62 is fitted into the opening 64 side of the container body 61, and the lid member 62 is pressed with a predetermined pressure, that is, while being pressed in the stacking direction of the heat exchanger body 2, the container body is The end portion of the opening 61 on the side of the opening portion 64 and the standing wall portion 71 of the lid member 62 are seam welded using a joining means such as TIG welding. As a result, the inside and the outside of the closed box 3 are airtightly partitioned.

By such an assembling method, the burring parts 24 and 29 and the burring parts 44 and 49 of the first and second molding plates 4 and 5 constituting the first flow path pipe 6 are crushed.
The flat plate portions 18 and 21 and the flat plate portions 38 and 41 are brought into close contact with each other due to the spring action due to the elastic deformation of the burring portions, and a desired sealing property is secured.

Further, the first and second parts constituting the second flow path pipe 7
Although the burring portions 25, 28 and the burring portions 45, 48 of the molding plates 4, 5 are crushed, the flat plate portions 19, 20 and the flat plate portions 39, 40 are brought into close contact with each other due to the spring action due to the elastic deformation of the burring portions. The desired sealing property is secured.

Therefore, the solution heat exchanger 1 assembled by the simple assembling method as described above ensures the desired sealing property without using welding or brazing in the heat exchanger body 2. Therefore, it is possible to prevent the high temperature concentrated solution and the low temperature diluted solution from being mixed with each other, and it is possible to prevent the heat exchange capacity of the solution heat exchanger 1 from being deteriorated. Further, it is possible to prevent the high temperature concentrated solution or the low temperature diluted solution from leaking out from the heat exchanger body 2.

[Operation of First Embodiment] The operation of the solution heat exchanger 1 of this embodiment will be described with reference to FIGS. 1 to 11.
When the operation of the double-effect absorption refrigerator is started, the high temperature concentrated solution is generated by being heated by the high temperature regenerator or the low temperature regenerator to generate the refrigerant vapor. This high temperature concentrated solution is a solution pipe (not shown), the first inlet pipe 67, the lid member 62.
When it flows into the heat exchanger main body 2 through the first inlet holes 72, the first inlet holes 27 and 47 of the plurality of first and second forming plates 4 and 5 are passed, as shown in FIG. While being distributed to the first fluid passages 51 in each first flow path pipe 6.

The hot concentrated solution distributed in each of the first fluid passages 51 is waved until it reaches the first outlet holes 22, 42 of the plurality of first and second molding plates 4, 5. Shape part 1
The second fluid passages 52 in the second flow path pipe 7 that are adjacent to each other through the first and second molding plates 4 and 5 flow so as to sew the concave portions 14 and 35 and the convex portions 15 and 34 of the first and the third. It is cooled by exchanging heat with a low-temperature dilute solution that flows backward in the concentrated solution.

The cooled concentrated solution is collected while passing through the first outlet holes 22, 42 of the plurality of first and second forming plates 4, 5, and is passed through the first outlet hole 74 of the lid member 62 to be collected. 1
It flows into the outlet pipe 68. Then, the first outlet pipe 68
The concentrated solution flowing into the inside is sent to, for example, an absorber through a solution pipe, and becomes a low temperature dilute solution by absorbing the refrigerant vapor while being further cooled in the absorber.

This low-temperature dilute solution is sent to a high-temperature regenerator under pressure by a solution pump, for example, and reheated. By heating the solution in the solution heat exchanger 1 before flowing into the high-temperature regenerator, the high-temperature regenerator is heated to a high temperature. Regenerator heating source (eg burner)
It reduces the fuel consumption of, and facilitates heating in the high temperature regenerator.

Therefore, the low-temperature dilute solution generated in the absorber is used for the second inlet pipe 69 and the second inlet hole 7 of the lid member 62.
When it flows into the heat exchanger body 2 through the third heat exchanger 3, as shown in FIG. 11, it passes through the second inlet holes 23 and 43 of the plurality of first and second forming plates 4 and 5, respectively, and flows into the second flow passages. It is distributed to the second fluid passage 52 in the passage pipe 7.

The low temperature dilute solution distributed in each of the second fluid passages 52 is waved until it reaches each of the second outlet holes 26, 46 of the plurality of first and second molding plates 4, 5. Shape part 1
The high-temperature concentrated solution and heat flowing in the first fluid passage 51 in the first flow path pipe 6 in a backward flow with respect to the dilute solution, flowing through the concave portions 14 and 35 and the convex portions 15 and 34 of Nos. 1 and 31. It is replaced and heated.

The heated dilute solution is collected while passing through the second outlet holes 26, 46 of the plurality of first and second forming plates 4, 5, and is collected in the second outlet hole 75, the second outlet of the lid member 62. It is pumped to the high temperature regenerator through the pipe 70 and the solution pipe.

Further, the container body 61 of the closed box 3 and the lid member 6
2 are joined by using joining means such as TIG welding or brazing, but the plurality of first and second heat exchanger main bodies 2 are joined together.
There is no adverse effect such as promotion of rust or corrosion due to the joining means to the molding plates 4 and 5, so that a concentrated solution or a dilute solution is formed between the side wall portions 13 and 33 of the two adjacent first and second molding plates 4 and 5. Never leaks. Even if the concentrated solution or the dilute solution leaks from between the side wall portions 13 and 33 of the first and second molding plates 4 and 5 adjacent to each other in the heat exchanger body 2, the inside of the closed box 3 is hermetically sealed from the outside. Since it is divided into, the concentrated solution and the dilute solution will not leak out from the closed box 3.

[Effects of the First Embodiment] As described above, since the vacuum brazing using the nickel brazing is not performed at the time of assembling the heat exchanger main body 2, the assembling of the solution heat exchanger 1 is very simple. Therefore, cost reduction can be achieved. Further, since vacuum brazing using nickel brazing is not performed when the heat exchanger body 2 is assembled, it is possible to prevent corrosion of the joint portion of each component of the heat exchanger body 2.

In addition, the heat exchanger body 2 is surrounded by a closed box 3
Thus, since the airtight cover is provided, it is possible to prevent the concentrated solution or the leakage of the concentrated solution from the sealed box 3 to the outside.
Therefore, it is possible to prevent air from entering the double-effect absorption refrigerating machine that is operated in a closed cycle that is closed to the outside. For this reason, it is possible to prevent the boiling point of the refrigerant from increasing due to the increase in the internal pressure in the evaporator, so that it is possible to prevent the evaporation amount of the refrigerant from decreasing. Therefore, it is possible to prevent the cooling capacity of the double-effect absorption refrigerator from decreasing.

[Second Embodiment] FIG. 12 shows a second embodiment of the present invention, and is a view showing a solution heat exchanger for a double-effect absorption refrigerator. In this embodiment, the first inlet pipe 67 and the first outlet pipe 68 are attached to the surface of the lid member 62, and the second inlet pipe 69 and the second outlet pipe 70 are attached to the surface of the bottom wall portion 65 of the container body 61. There is. Conversely, the first inlet pipe 67 and the first outlet pipe 68 may be attached to the surface of the bottom wall portion 65 of the container body 61.

[Third Embodiment] FIG. 13 shows a third embodiment of the present invention, and is a view showing a solution heat exchanger for a double-effect absorption refrigerator. In this embodiment, the first inlet pipe 67 and the first outlet pipe 68 are attached to the surface of the lid member 62, and the second inlet pipe 69 and the second outlet pipe 70 are attached to the outer surface of the side wall portion 63 of the container body 61. There is.

In the case of this embodiment, the heat exchanger main body in which a plurality of flow passage pipes through which the concentrated solution flows are arranged in a row at a predetermined gap is incorporated into the closed box 3, and the periphery of the plurality of flow passage pipes is incorporated. Allow the dilute solution to flow. On the contrary, the first inlet pipe 67
The first outlet pipe 68 may be attached to the outer surface of the side wall portion 63 of the container body 61.

[Fourth Embodiment] FIG. 14 shows a fourth embodiment of the present invention and is a view showing a solution heat exchanger for a double-effect absorption refrigerator. In this embodiment, the container body 6
The end portion of the first opening portion 64 on the side of the opening portion 64 and the standing wall portion 71 of the lid member 62 are bent outward in the middle, and the bent portions 81 and 82 are seam welded using a joining means such as TIG welding or brazing. is doing.

[Fifth Embodiment] FIG. 15 shows a fifth embodiment of the present invention and is a view showing a solution heat exchanger for a double-effect absorption refrigerator. In this embodiment, the container body 6
The bent portion 81 of the first opening portion 64 side and the bent portion 82 of the standing wall portion 71 of the lid member 62 are fixed by caulking.

[Sixth Embodiment] FIG. 16 shows a sixth embodiment of the present invention and is a view showing a solution heat exchanger for a double-effect absorption refrigerator. In this embodiment, the first and second
The molding plates 4 and 5, the ceiling side plate 53 and the bottom side plate 54 are press-fitted into the closed box 3 so that the bending directions of the side wall portions 13, 33, 57 and 58 are opposite to those of the first embodiment. is there. Further, between the end of the container body 61 on the opening 64 side and the standing wall 71 of the lid member 62, the first and second
Escape portions 83 are formed to escape from the side walls 13, 33, 57 of the molding plates 4, 5 and the ceiling plate 53.

In this case, the container main body 6 with the plate walls 12, 32 of the first and second molding plates 4, 5 etc. facing backwards.
Since it will be press-fitted into the inside of each of the side walls 13, 33.
Does not get caught on the end of the side wall 63 of the container body 61 on the side of the opening 64. For this reason, the heat exchanger body 2 is easily pressed into the container body 61, so that the solution heat exchanger 1
Will be easier to assemble.

[Seventh Embodiment] FIG. 17 shows a seventh embodiment of the present invention and is a view showing a solution heat exchanger for a double-effect absorption refrigerator. In this embodiment, the first inlet pipe 67, the first outlet pipe 68, the second inlet pipe 69, and the second outlet pipe 70 are attached to the surface of the bottom wall portion 65 of the container body 61.

[Eighth Embodiment] FIG. 18 shows an eighth embodiment of the present invention and is a view showing a solution heat exchanger for a double-effect absorption refrigerator. In this embodiment, the container body 6
The end portion of the first opening portion 64 on the side of the opening portion 64 and the standing wall portion 71 of the lid member 62 are bent outward in the middle, and the bent portions 81 and 82 are seam welded using a joining means such as TIG welding or brazing. is doing.

[Ninth Embodiment] FIG. 19 shows a ninth embodiment of the present invention and is a view showing a solution heat exchanger for a double-effect absorption refrigerator. In this embodiment, the bent portions 81, 82 of the eighth embodiment are further extended upward in the drawing, and the extended portions 84, 85 are seam welded by using a joining means such as TIG welding or brazing.

[Tenth Embodiment] FIG. 20 shows the first embodiment of the present invention.
It is a figure showing Example 0 and showing a lid member of a closed box. In this embodiment, an inlet / outlet pipe 86 through which a concentrated solution or a dilute solution flows in or out is integrally formed with the lid member 61 by burring or the like. By doing so, the number of welding points of the solution heat exchanger 1 is reduced, so that the workability of assembling is improved.

[Modification] In the present embodiment, the heat exchanger body 2 was press-fitted into the container body 61 from the stacking direction of the first and second molding plates 4 and 5, but the first and second molding plates 4 and 5 5
The heat exchanger body 2 may be inserted into the container body 61 from a direction substantially orthogonal to the stacking direction.

In the present embodiment, the present invention is applied to the solution heat exchanger 1 for a double-effect absorption refrigerating machine, but the present invention is also applied to a solution heat exchanger for a single-effect absorption refrigerating machine. good. Further, it may be applied to a heat exchanger that exchanges heat with a fluid such as water, an aqueous solution, a refrigerant, or oil.

In the present embodiment, the heat exchanger body 2 is composed of two types of molding plates, the first and second molding plates 4 and 5, but the heat exchanger body is composed of one or more types of molding plates. It may be configured. Further, the heat exchanger body may be composed of a plurality of tubes and a plurality of plate fins.

In this embodiment, no joining means was used in the heat exchanger body 2, but the flat plate portion 18 of the first molding plate 4 was used.
21 to the flat plate portions 38 to 41 of the second molding plate 5 may be fused by using a joining means such as fusion welding, pressure welding or brazing.

As a method for joining the end portion of the closed box 3 on the opening 64 side of the container body 61 and the peripheral portion of the lid member 62, fusion welding methods such as arc welding and laser beam welding other than TIG welding, and electric resistance welding are used. A pressure welding method such as friction welding or friction welding, or a brazing method such as vacuum brazing or dip brazing may be used. If the airtightness of the closed box 3 is ensured, fastening means such as bolting may be used.

In the absorption refrigerator, not only the heat exchanger body 2 of the solution heat exchanger 1, but also fluid pipes such as solution pipes and refrigerant pipes, high temperature regenerators, low temperature regenerators, condensers, evaporators or You may cover each connection part of refrigeration equipment, such as an absorber, with a closed box. When a plurality of solution heat exchangers are provided, a plurality of heat exchanger bodies may be covered with one closed box, and the entire absorption refrigerator may be covered with a closed box.

[0085]

According to the first aspect of the present invention, by covering the periphery of the heat exchanger main body composed of a plurality of parts with the closed box, even if the fluid leaks between the two adjacent parts, the fluid Can be prevented from leaking out of the closed box.

The inventions described in claims 2 and 3 are
By covering the periphery of the heat exchanger body composed of a plurality of molding plates with a closed box, even if fluid leaks between two adjacent molding plates, the fluid is prevented from leaking out of the closed box. be able to.

According to the fourth aspect of the invention, the heat exchange is performed even when the opening-side end of the container body and the peripheral portion of the lid member are joined by using a joining means such as fusion welding, pressure welding or brazing. Parts such as a plurality of molding plates that form the main body of the container are not adversely affected by the joining means such as promotion of rust and corrosion. Therefore, it is possible to prevent the fluid from leaking between the two adjacent components.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a first embodiment of the present invention.

FIG. 3 is a plan view showing a first molding plate used in the first embodiment of the present invention.

4 is a cross-sectional view taken along the line AA of FIG.

5 is a sectional view taken along line BB of FIG.

6 is a cross-sectional view taken along line CC of FIG.

FIG. 7 is a plan view showing a second molding plate used in the first embodiment of the present invention.

8 is a cross-sectional view taken along the line AA of FIG.

9 is a sectional view taken along line BB of FIG.

10 is a cross-sectional view taken along line CC of FIG.

FIG. 11 is an exploded view showing flows of a concentrated solution and a dilute solution according to the first embodiment of the present invention.

FIG. 12 is a front view showing a second embodiment of the present invention.

FIG. 13 is a front view showing a third embodiment of the present invention.

FIG. 14 is a sectional view showing a main part of a fourth embodiment of the present invention.

FIG. 15 is a sectional view showing a main part of a fifth embodiment of the present invention.

FIG. 16 is a sectional view showing a sixth embodiment of the present invention.

FIG. 17 is a sectional view showing a seventh embodiment of the present invention.

FIG. 18 is a sectional view showing a main part of an eighth embodiment of the present invention.

FIG. 19 is a sectional view showing a main part of a ninth embodiment of the present invention.

FIG. 20 is a sectional view showing a lid member of a closed box used in a tenth embodiment of the present invention.

FIG. 21 is a cross-sectional view showing a conventional solution heat exchanger.

[Explanation of symbols]

 1 Solution Heat Exchanger 2 Heat Exchanger Main Body 3 Closed Box 4 First Forming Plate (Component) 5 Second Forming Plate (Component) 6 First Flow Pipe 7 Second Flow Pipe 11 Corrugation 12 Plate Wall 13 Side Wall Part 22 1st exit hole (communication hole) 23 2nd entrance hole (communication hole) 26 2nd exit hole (communication hole) 27 1st entrance hole (communication hole) 31 Wave shape part 32 Plate wall part 33 Side wall part 42 1st Outlet hole (communication hole) 43 Second inlet hole (communication hole) 46 Second outlet hole (communication hole) 47 First inlet hole (communication hole) 51 First fluid passage 52 Second fluid passage 61 Container body 62 Lid member 64 Opening 67 First inlet pipe 68 Second inlet pipe 69 First outlet pipe 70 Second outlet pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsuhiko Uenishi 4-1-2 Hirano-cho, Chuo-ku, Osaka Within Osaka Gas Co., Ltd. (72) Shinsuke Takahashi 4-1-2 Hirano-cho, Chuo-ku, Osaka No. within Osaka Gas Co., Ltd.

Claims (4)

[Claims] 1. A heat exchanger body comprising a plurality of parts for exchanging heat of a fluid, and a sealed box for covering the periphery of the heat exchanger body and for hermetically partitioning the inside and the outside. Heat exchanger. 2. The heat exchanger according to claim 1, wherein the plurality of members are a plurality of molded plates formed by molding a metal plate having excellent heat resistance and corrosion resistance, and each of these molded plates is a molded plate. The heat exchanger is characterized in that a communication hole is formed through the plate in the plate thickness direction. 3. The heat exchanger according to claim 2, wherein the heat exchanger main body is formed by stacking the plurality of molding plates such that the communication holes of the plurality of molding plates communicate with each other in the plate thickness direction. According to the heat exchanger, a plurality of fluid passages communicating with the communication holes are formed in the plate length direction or the plate width direction of the plurality of molding plates. 4. The heat exchanger according to any one of claims 1 to 3, wherein the closed box is made of a metal having excellent heat resistance and corrosion resistance, and has a container body having one end opened. It is composed of a lid member for closing the opening of the container body, and the end portion on the opening side of the container body and the peripheral portion of the lid member are joined together by using a joining means such as fusion welding, pressure welding or brazing. Characteristic heat exchanger.