JPH06331295A - Stacked heat exchanger - Google Patents

Abstract

PURPOSE:To provide a stacked heat exchanger, particularly light-weight and manufactured at a low cost, which is used as a stacked heat exchanger in which liquid and two-phased stream of gas and liquid having a phase change are used as fluid. CONSTITUTION:A heat exchanging fluid A flows through a slit 27 formed in a plate 24, and another heat exchanging fluid B flows through another slit 33 formed in another plate 24. At this time, the heat exchanging fluid A exchanges heat with the heat exchanging fluid B through two other plates 25 which are arranged above and below the plate 27. If the pressure of the heat exchanging fluid A is smaller than that of the heat exchanging fluid B, the width of the slit 33 is made to be smaller than that of the slit 27. By this, it becomes possible to make the plate thin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a laminated heat exchanger used for heat exchange of liquid as a fluid and gas-liquid two-phase flow accompanied by phase change.

[0002]

2. Description of the Related Art The structure of a conventional laminated heat exchanger is shown in FIG. FIG. 5 shows a part of the laminated heat exchanger so as to be able to explain the internal structure thereof. The heat exchange fluid A flows into the header 3 from the inlet / outlet pipe 2 of the end plate 1.
The header 3 is a space formed by stacking a large number of plates 4, 5, and 6 and connects the inlet / outlet pipe and the flow path. The heat exchange fluid A flowing into the header 3 enters the slit 7 formed in the plate 4. Supporting part 8 for slit 7
There is. The support part becomes a part that supports the internal pressure when stacked. The heat exchange fluid A flows through the slit 7 and the header 9
And is discharged from the inlet / outlet pipe 10. On the other hand, the heat exchange fluid B flows into the header 12 through the inlet / outlet pipe 11 and enters the slit 13 formed in the plate 6. Slit 1
3 has a support portion 14. The heat exchange fluid B flowing through the slit 13 is collected by the header 15 and flows out from the inlet / outlet pipe 16. The plate 5 has headers 3, 9 and 1 for stacking.
Slits forming 2, 15 are provided. A large number of these plates 4, 5 and 6 are laminated in this order between the end plates 1 and 17 in the order of 4, 5, 6 and 5, and the heat exchange fluid A,
The laminated heat exchanger is formed by completely adhering so that B does not leak. Diffusion welding or brazing is used as the contact method. In diffusion welding, the temperature is raised to a temperature slightly lower than the melting point in a vacuum and pressure is applied, and is integrated by diffusion of the material of the plate. In brazing, a brazing material having a lower melting point than the plate is attached to the contact surface, and the temperature is raised to the melting point of the brazing material in a vacuum or an inert atmosphere. As a result, the heat exchange fluids A and B can flow through the header and the slit without leaking to the outside. At this time, the heat exchange fluid A flowing through the slit 7 is
Through the two plates 5 located above and below the slit 7, heat exchange with the heat exchange fluid B flowing through the slit 13 is performed.

[0003]

However, such a conventional laminated heat exchanger has the following problems.

Since the heat exchange fluid generally operates at a pressure different from atmospheric pressure, the laminated heat exchanger requires a pressure resistant structure. Therefore, there is a problem that the plate C needs to have a thickness to withstand the pressure, the weight of the laminated heat exchanger becomes large, and the material cost also becomes large.

The present invention is based on the above problems and is lightweight and
An object is to provide a low cost laminated heat exchanger.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention uses the above-mentioned heat at the time of stacking with flat plate-shaped plates A and B having slits serving as flow paths for two heat exchange fluids A and B, respectively. The plates C that form the partition wall for the exchange fluid are A, C,
In a laminated heat exchanger in which a plurality of sets of B and C are laminated in this order to form an integrated structure, (1) The width of the slit of the fluid having a low operating pressure of the heat exchange fluids A and B is set to the width of the slit of the fluid having a high operating pressure. Make it smaller than. (2) A large number of convex portions are alternately formed from both sides of both or one of the heat exchange fluids A and B. (3) A convex portion is formed on the plate C so as to protrude into one or both slits of the flat plate-shaped plates A and B and to have a contact portion with the adjacent plate C at the time of stacking. (4) The plate C is formed with a convex portion located on a side portion of a wall forming a slit during stacking. It is a thing.

[0007]

The operation obtained by the above-mentioned structure or means is as follows.

When the pressure resistance is taken into consideration when the flow path has a rectangular cross section, the length of the longer rectangular wall and the thickness of the wall are important. The required wall thickness varies depending on the shape of the slit, but generally, if the length of a long rectangular wall is L and the wall thickness is t, the square of the ratio of t and L should be a certain value or more. There is a need to. In the laminated heat exchanger according to the present invention, L corresponds to the width of the slit, and t corresponds to the thickness of the plate C serving as a partition. Therefore, if the slit width L is reduced, the breakdown voltage is maintained even if the thickness t of the plate C is reduced. When the thickness of the plate C is reduced, the thickness of the laminated heat exchanger as a whole is also reduced, and a lightweight, low-cost laminated heat exchanger is possible.

[0009]

【Example】

(Embodiment 1) Specific examples according to the present invention will be described in detail below.

FIG. 1 shows an embodiment according to the first invention,
1 shows a structure of a laminated heat exchanger. FIG. 1 shows a part of the laminated heat exchanger so that the internal structure of the laminated heat exchanger can be described. The heat exchange fluid A flows into the header 23 through the inlet / outlet pipe 22 installed in the end plate 21.
The header 23 is a space formed by stacking a large number of plates 24, 25, and 26, and connects the inlet / outlet pipe and the flow path. The heat exchange fluid A flowing into the header 23 enters the slit 27 formed in the plate 24. The slit 27 has a support portion 28. The support part becomes a part that supports the internal pressure when stacked. The heat exchange fluid A flowing through the slit 27 is collected in the header 29 and flows out from the inlet / outlet pipe 30. On the other hand, the heat exchange fluid B flows into the header 32 from the inlet / outlet pipe 31, and enters the slit 33 formed in the plate 26. The slit 33 has a support portion 34. The heat exchange fluid B flowing through the slit 33 is collected by the header 35 and flows out from the inlet / outlet pipe 36. Plate 25 has
Slits that form the headers 23, 29, 32, and 35 during stacking are provided. These plates 24, 2
By laminating a large number of 5, 26 in the order of 24, 25, 26, 25 and completely adhering so that the heat exchange fluids A, B do not leak, a laminated heat exchanger is formed. Diffusion welding or brazing is used as the contact method. Diffusion welding
In vacuum, the temperature is raised to a temperature slightly lower than the melting point and pressure is applied, and the plate material is integrated by diffusion. In brazing, a brazing material having a lower melting point than the plate is attached to the contact surface, and the temperature is raised to the melting point of the brazing material in a vacuum or an inert atmosphere. As a result, the heat exchange fluid A
And B can flow through the header and the slit without leaking to the outside. At this time, the heat exchange fluid A flowing through the slit 27 is located above and below the slit 27.
The heat exchange fluid B flowing through the slit 33 is exchanged with heat through the one plate 25. In the present embodiment, an example in which the pressure of the heat exchange fluid A is smaller than the pressure of the heat exchange fluid B is shown, and the slit 27 installed in the plate 24 is larger than the width of the slit 33 installed in the plate 26. The width of is reduced. As mentioned above, heat exchange fluid A
Since the pressure of is smaller than that of the heat exchange fluid B, the slit 27 is compressed by the differential pressure from the upper and lower surfaces. In order to withstand this compression, the width of the slit 27 is made small. Therefore, even if the thickness of the plate 25 is made small, the pressure resistance is ensured. In the actual example, slit 2
By reducing the width of 7 from 8 mm to 4 mm, the same withstand voltage is obtained even when the plate 25 is reduced from 0.6 mm to 0.3 mm. As a result, the total weight of the laminated heat exchanger could be reduced by about 40%.

As described above, the present invention provides a lightweight and low-cost laminated heat exchanger.

Although the width of only the slit 27 is reduced in this embodiment, the same pressure resistance can be obtained by reducing the width of both of them including the slit 33.
However, in order to reduce the slit width and obtain the same heat exchange capacity, it is necessary to increase the number of slits, which increases the manufacturing cost. Therefore,
According to the present invention, it is possible to ensure the pressure resistance by increasing only one slit.

(Embodiment 2) FIG. 2 shows an embodiment of the second invention, showing the structure of a laminated heat exchanger.
FIG. 2 shows a part of the laminated heat exchanger in a cutaway form so that the internal structure can be described. The heat exchange fluid A is transferred from the inlet / outlet pipe 42 installed in the end plate 41 to the header 4
Inflow to 3. The header 43 includes the plates 44 and 4
A space formed by stacking a large number of 5, 46,
It connects the inlet and outlet pipes and the flow path. The heat exchange fluid A that has flowed into the header 43 has slits 47 formed in the plate 44.
to go into. The slit 47 has a support portion 48. The support part becomes a part that supports the internal pressure when stacked. The heat exchange fluid A flowing through the slit 47 is collected in the header 49,
It flows out from the inlet / outlet pipe 50. On the other hand, the heat exchange fluid B flows into the header 52 from the inlet / outlet pipe 51 and enters the slit 53 formed in the plate 46. The slit 53 has a support portion 54. The heat exchange fluid B flowing through the slit 53 is collected by the header 55 and flows out from the inlet / outlet pipe 56. The plate 45 has headers 43, 49, 52,
A slit forming 55 is provided. A large number of these plates 44, 45, 46 are laminated in the order of 44, 45, 46, 45, and they are completely adhered so that the heat exchange fluids A, B do not leak to form a laminated heat exchanger. .
Diffusion welding or brazing is used as the contact method.
In diffusion welding, the temperature is raised to a temperature slightly lower than the melting point in a vacuum and pressure is applied, and is integrated by diffusion of the material of the plate. In brazing, a brazing material having a lower melting point than the plate is attached to the contact surface, and the temperature is raised to the melting point of the brazing material in a vacuum or an inert atmosphere. This allows
The heat exchange fluids A and B can flow through the header and the slit without leaking to the outside. At this time, the heat exchange fluid A flowing through the slit 47 passes through the two plates 45 located above and below the slit 47 and passes through the slit 53.
Heat is exchanged with the heat exchange fluid B flowing through. A large number of convex portions 57 are provided in the slits 47 alternately from the support portion 48 in the direction perpendicular to the flow of the heat exchange fluid A. This produces the same effect as reducing the flow passage width of the heat exchange fluid A, and the pressure resistance is sufficiently ensured even if the thickness of the plate 45 is reduced. In the present embodiment, an example in which the pressure of the heat exchange fluid A is lower than the pressure of the heat exchange fluid B is shown, and the slit 47 is compressed from the upper and lower surfaces by the differential pressure. In order to withstand this compression, the convex portion 57 is provided only in the slit 47. In an actual example, by providing the protrusions at intervals of 6 mm in the slit having a width of 8 mm, the same withstand voltage is obtained even when the plate 45 is reduced from 0.6 mm to 0.3 mm. As a result, the total weight of the laminated heat exchanger could be reduced by about 40%. Further, the convex portion 57 installed in the present invention makes the flow direction of the heat exchange fluid A zigzag. As a result, the heat transfer coefficient of the heat exchange fluid A was improved, and the effect of improving the characteristics of the laminated heat exchanger was also exhibited.

As described above, the present invention provides a lightweight and low-cost laminated heat exchanger.

In this embodiment, the convex portion 57 is provided only in the slit 47, but the same pressure resistance can be obtained even if the slit 53 is provided on both sides. Manufacturing cost will increase a little by installing on both sides,
By making the flow direction of the heat exchange fluid B zigzag, it is possible to increase the heat transfer coefficient and further downsize the laminated heat exchanger.

(Embodiment 3) FIG. 3 shows an embodiment according to the third invention, showing the shape of the plates constituting the laminated heat exchanger. The laminated heat exchanger has a plate 61,
It is configured by stacking a large number of 62, 63, 64. The heat exchange fluid A flows in from the header 65. Header 65
Is a space formed by stacking the plates 61, 62, 63 and 64, and connects the inlet / outlet portion (not shown) and the flow path. Heat exchange fluid A flowing into the header 65
Enters the slit 66 formed in the plate 61. The slit 66 has a support portion 67. The support part becomes a part that supports the internal pressure when stacked. The heat exchange fluid A flowing through the slit 66 is collected in the header 68 and flows out to the outside. On the other hand, the heat exchange fluid B flows in from the header 69,
It enters the slit 70 formed in the plate 63. The slit 70 has a supporting portion 71. The heat exchange fluid B flowing through the slit 70 is collected by the header 72 and flows out to the outside. The plates 62 and 64 include a header 6 when laminated.
Slits forming 5,68,69,72 are provided. A large number of these plates 61, 62, 63, 64 are sequentially laminated, and they are completely adhered to each other so that the heat exchange fluids A, B do not leak to form a laminated heat exchanger. Diffusion welding or brazing is used as the contact method. As a result, the heat exchange fluids A and B do not leak to the outside,
It is possible to flow through the header and the slit. At this time, the heat exchange fluid A flowing through the slit 66 exchanges heat with the heat exchange fluid B flowing through the slit 70 through the two plates 62 and 64 located above and below the slit 66. Here, the plate 62 is provided with a convex portion 73 that is convex upward and a convex portion 74 that is convex downward. The convex portion 73 is a slit 6 that serves as a flow path for the heat exchange fluid A during stacking.
It is in close contact with the plate 64 located at the center of 6 and above the slit 66. On the other hand, the convex portion 74 is located in the central portion of the slit 70 that serves as a flow path for the heat exchange fluid B during stacking, and is brought into close contact with the plate 64 located below the slit 70. This produces the same effect as reducing the flow path width of the heat exchange fluids A and B, and the pressure resistance is sufficiently ensured even if the thickness of the plates 62 and 64 is reduced.
In addition, the convex portions 73 and 74 installed in the present invention also have the effect of changing the flow direction of the heat exchange fluids A and B, which improves the heat transfer coefficient of the heat exchange fluids A and B, and thus the laminated heat exchange system. It also has the effect of improving the characteristics of the container.

As described above, the present invention provides a lightweight and low-cost laminated heat exchanger.

(Embodiment 4) FIG. 4 is an embodiment according to the fourth invention and shows the shape of the plates constituting the laminated heat exchanger. The laminated heat exchanger has a plate 81,
It is configured by stacking a large number of 82, 83, 84. The heat exchange fluid A flows in from the header 85. Header 85
Is a space formed by stacking the plates 81, 82, 83, 84, and connects an inlet / outlet portion (not shown) to the flow path. Heat exchange fluid A flowing into the header 85
Enters the slit 86 formed in the plate 81. The slit 86 has a support portion 87. The support part becomes a part that supports the internal pressure when stacked. The heat exchange fluid A flowing through the slit 86 is collected in the header 88 and flows out to the outside. On the other hand, the heat exchange fluid B flows in from the header 89,
It enters the slit 90 formed in the plate 83. The slit 90 has a support 91. The heat exchange fluid B flowing through the slit 90 is collected by the header 92 and flows out to the outside. The plates 82 and 84 include a header 8 when laminated.
Slits forming 5,88,89,92 are provided. A large number of these plates 81, 82, 83, 84 are laminated in order and completely adhered so that the heat exchange fluids A, B do not leak, thereby forming a laminated heat exchanger. Diffusion welding or brazing is used as the contact method. As a result, the heat exchange fluids A and B do not leak to the outside,
It is possible to flow through the header and the slit. At this time, the heat exchange fluid A flowing through the slit 86 exchanges heat with the heat exchange fluid B flowing through the slit 90 through the two plates 82 and 84 located above and below the slit 86. Here, the plate 82 is provided with a convex portion 93 that is convex downward. The convex portion 93 is located at the end of the slit 90 that serves as a flow path for the heat exchange fluid B during stacking, and is in contact with the support portion 91. This is because if the width of the slit 90 is reduced in order to reduce the thickness of the plates 82 and 84, it becomes difficult to secure the flow paths of the heat exchange fluids A and B due to the displacement of the support portion 91 that occurs when the plates are stacked. Is to prevent. Plates 81, 82, 8
When 3, 84 are laminated, the convex portion 93 prevents the position of the support portion 91 from being displaced, and it is possible to make a highly reliable laminated heat exchanger.

As described above, the present invention provides a reliable, lightweight and low-cost laminated heat exchanger.

[0020]

As described above, in the laminated heat exchanger of the present invention, the two heat exchange fluids A and B are heat-treated at the time of lamination with the flat plate-shaped plates A and B each having a slit serving as a flow path. The plates C that form the partition wall for the exchange fluid are A, C,
In a laminated heat exchanger in which a plurality of sets of B and C are laminated in this order to form an integrated structure, (1) The width of the slit of the fluid having a low operating pressure of the heat exchange fluids A and B is set to the width of the slit of the fluid having a high operating pressure. Make it smaller than. (2) A large number of convex portions are alternately formed from both sides of both or one of the heat exchange fluids A and B. (3) A convex portion is formed on the plate C so as to protrude into one or both slits of the flat plate-shaped plates A and B and to have a contact portion with the adjacent plate C at the time of stacking. (4) The plate C is formed with a convex portion located on a side portion of a wall forming a slit during stacking. This enables a lightweight and low-cost laminated heat exchanger.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a laminated heat exchanger according to an embodiment of the first invention.

FIG. 2 is a configuration diagram of a laminated heat exchanger according to an embodiment of the second invention.

FIG. 3 is a configuration diagram of plates constituting a laminated heat exchanger according to an embodiment of the third invention.

FIG. 4 is a configuration diagram of plates constituting a laminated heat exchanger according to an embodiment of the fourth invention.

FIG. 5 is a block diagram of a conventional laminated heat exchanger.

[Explanation of symbols]

 24, 25, 26 plate 27 slit 28 support part

Claims (5)

[Claims] 1. A plate C, A, C, B forming a partition wall of the heat exchange fluid at the time of stacking with flat plate-shaped plates A, B each having at least two heat exchange fluids A, B each having a slit serving as a flow path. , C in the laminated heat exchanger having a laminated structure in which a plurality of sets are stacked in this order, the width of the slit of the fluid having a low operating pressure of the heat exchange fluids A and B is compared with the width of the slit of a fluid having a high operating pressure. Stacked heat exchanger that is smaller and smaller. 2. A plate C, which forms a partition for the heat exchange fluids A and B, and a plate C, which forms a partition wall of the heat exchange fluid when laminated, and flat plates A and B, each of which has a slit serving as a flow path for each of the heat exchange fluids A and B. , C in the order of a plurality of layers to form an integrated structure, wherein a plurality of convex portions are alternately formed from both sides of one or both slits of the heat exchange fluids A and B. 3. The laminated heat exchanger according to claim 2, wherein a large number of convex portions are formed only in slits of the heat exchange fluids A and B having a low operating pressure. 4. At least two heat exchange fluids A, B are flat plates A and B each having a slit formed therein to form a flow path, and plates C and C'which form partition walls of the heat exchange fluid when laminated are denoted by A, In a laminated heat exchanger in which a plurality of sets of C, B, and C ′ are laminated in this order to form an integral structure, the flat plate plates A and B are projected into one or both slits,
A laminated heat exchanger in which a convex portion having a contact portion with the plate C during lamination is formed on the plate C ′. 5. A plate C, which forms a partition for the heat exchange fluids when laminated, and flat plates A, B having slits which form channels for at least two heat exchange fluids A, B, respectively. , C in the order of stacking to form an integral structure, wherein the plate C is provided with a convex portion located on the side of the wall forming the slit during stacking.