JP2000249487A - Laminate heat exchanger and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance reliability by jointing weak adhesion parts surely thereby eliminating mixing of heat exchanging fluids. SOLUTION: Channel plates 4 and 6 are laminated sequentially through partition plates 5 and a brazing material layer 18 is provided on the surface of the channels plates 4, 6 at such a part as an adjacent channels plate 4 or 6 faces a channel 13 or 7. Subsequently, the plates are jointed by hot press and weak adhesion parts are brazed surely thus eliminating mixing of leaked heat exchanging fluids A, B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated heat exchanger using a two-phase gas-liquid fluid including a liquid and a gas undergoing a phase change as a fluid for heat exchange, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, a laminated heat exchanger as shown in FIG. 6 has been proposed for the purpose of reducing the size and weight of a heat exchanger. FIG. 6 is a schematic view partially cut away to explain the internal structure of the stacked heat exchanger.

[0003] The heat exchange fluid A flows into the header 43 from the inlet pipe 42 of the end plate 41. Header 43, 4
Reference numerals 9, 52, and 55 denote spaces formed by sequentially stacking a large number of flow path plates 44, 46 and partition plates 45, and connect the flow paths to the inlet pipes 42, 51 and the outlet pipes 50, 56. The heat exchange fluid A that has flowed into the header 43 enters a slit-like flow path 47 formed in the first flow path plate 44. A support portion 48 is provided on the side of the flow path 47.
The support portion 48 is a portion that supports internal pressure when a large number of plates are stacked and joined together. The heat exchange fluid A flows through the flow path 47 and returns to the header 4 again.
9 and flows out of the outlet pipe 50.

On the other hand, the heat exchange fluid B flows from an inlet pipe 51 into a header 52 formed similarly to the header 43,
It enters a slit-shaped flow path 53 formed in the second flow path plate 46. A support portion 54 is also provided on a side portion of the flow path 53. The heat exchange fluid B flowing through the flow path 53 is collected by the header 55 and flows out of the outlet pipe 56.

A partition plate 45 serving as a partition wall for the heat exchange fluids A and B has a header 4 when the respective plates are stacked.
Through holes forming 3, 49, 52, 55 are provided. The flow path plates 44 and 46 and the partition plate 45 are composed of the end plate 41 and the end plate 5.
7, a large number of the flow path plates 44, the partition plates 45, the flow path plates 46, and the partition plates 45 are laminated in this order, and the respective plates are completely tightly joined so that the heat exchange fluids A and B do not leak. Thus, a stacked heat exchanger is formed. The heat exchange fluid A flowing through the flow path 47 exchanges heat with the heat exchange fluid B flowing through the flow path 53 via the two partition plates 45 positioned above and below.

[0006] In forming such a laminated heat exchanger, the flow path plate and the partition plate may be hermetically joined by diffusion welding, brazing, or a method disclosed in For example, a method of bonding is used as disclosed in Japanese Patent No. 14595. In the diffusion welding method, the temperature is raised to a temperature slightly lower than the melting point of the plate material in a vacuum, pressure is applied, and the materials at the contact surfaces are integrally joined by diffusion. In addition, the brazing method is to apply a brazing material having a lower melting point than the base material to the joining surface, raise the temperature to the melting point or more, pressurize, and diffuse the molten brazing material into the base material to perform integrated joining. Is what you do. on the other hand,
In the bonding method, an adhesive such as an epoxy-based adhesive is applied to the bonding surface by a printing method of a silk screen process, and heat curing is performed.

[0007]

However, such a conventional laminated heat exchanger is not preferable because of the following problems.

When diffusion welding is used to integrally join the flow path plates 44 and 46 and the partition plate 45, if the adhesion between the respective plates is poor, a gap is formed at the joint and the fluid leaks. There is a problem that it is easy to cause the problem. For example, FIG. 7 is a schematic cross-sectional view of the stacked heat exchanger shown in FIG.
Of the flow path plate 44 and the second flow path plate 46,
The state in which the layers are stacked via the partition plate 45 is shown.
When the temperature is increased by applying pressure in such a state, the arrow C
Since the portions indicated by are stacked in a state where all the plates are in close contact with each other, a sufficient vertical load at the time of pressurization is applied, and the adhesion between the plates is also improved, so that sufficient bonding is easily performed.

However, on the other hand, since the flow path 47 is interposed in the portion indicated by the arrow D, the vertical load is hardly applied sufficiently, and the adhesion between the plates is impaired. Was. In particular, when a joint failure occurs near the headers 43 and 49, there is a problem that the heat exchange fluid A flowing through the headers 43 and 49 and the heat exchange fluid B flowing through the flow path 53 are mixed. Also, when joining by a brazing method, if the adhesion between the plates is poor,
There is a gap in the joint, which is likely to cause a leak.Furthermore, if the bonding method is used, the reliability of the joint such as pressure resistance and heat resistance is poor, and the pressure and temperature at which the heat exchanger is used are extremely limited. There was a problem that occurs.

[0010]

In order to solve the above-mentioned problems, the present invention provides a first flow path plate having one heat exchange fluid flow path and a first heat exchange fluid flow path having the other heat exchange fluid flow path. 2
And a plurality of sets in which a plurality of sets are stacked with a partition plate interposed therebetween, at a position on the surface of each of the flow path plates facing the flow path of an adjacent flow path plate through the partition plate. A brazing material is provided, and the plates are joined by heating in a pressurized state.

The flow path plate and the partition plate are securely joined together, and the portions having poor adhesion between the respective plates are air-tightly joined by brazing with a brazing material. The reliability can be improved without the heat exchange fluid and the heat exchanger on the secondary side being mixed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be embodied by the constitutions described in the respective claims.

According to the present invention, a first flow path plate having a slit-shaped primary fluid flow path and a slit-shaped secondary fluid flow path are provided. A plurality of sets each including a second flow path plate having a plurality of stacked laminations via a partition plate are stacked and opposed to the flow path of the flow path plate adjacent to the surface of each of the flow path plates via the partition plate. A brazing material is disposed at a position where the respective plates are to be joined to each other.

Then, the flow path plate and the partition plate are securely joined, and a portion having poor adhesion between the respective plates is brazed with a brazing material and joined in an airtight manner. Is not mixed with the heat exchange fluid on the secondary side.

Further, as described in the second aspect, the first flow path plate in which the flow path of the primary fluid is formed in a slit shape, and the second flow path plate in which the flow path of the secondary fluid is formed in a slit shape. And a plurality of sets in which the first flow path plate and the second flow path plate are stacked via the partition plate to form a stacked heat exchanger, and the second flow path is provided at the contact surface between the first flow path plate and the partition plate. Positioning the brazing material at a position facing the flow path of the passage plate, and at a contact surface between the second flow path plate and the partition plate, and at a position facing the flow path of the first flow path plate, The bonding is performed by heating in a pressurized state.

Then, the respective plates are securely joined by diffusion welding, and the portions having poor adhesion between the plates are brazed by the brazing material.
A highly reliable laminated heat exchanger can be provided.

Further, as described in the third aspect, the first flow path plate in which the flow path of the primary fluid is formed in a slit shape, and the second flow path plate in which the flow path of the secondary fluid is formed in a slit shape. A plurality of sets in which the flow path plate and the partition plate are stacked via a partition plate to form a stacked heat exchanger, wherein the contact surface between the first flow path plate and the partition plate, Plating is applied to a position facing the flow path of the flow path plate and a position facing the flow path of the first flow path plate at a contact surface between the second flow path plate and the partition plate; The bonding is performed by forming a layer and heating under pressure.

[0018] Then, the respective plates are securely joined by diffusion welding, and a brazing material layer is formed by plating on a portion having poor adhesion between the respective plates, so that the joining property can be improved. It is possible to provide a laminated heat exchanger that is excellent in yield and highly reliable.

Further, as described in the fourth aspect, the first flow path plate in which the flow path of the primary fluid is formed in a slit shape, and the second flow plate in which the flow path of the secondary fluid is formed in a slit shape. And a plurality of sets in which the first flow path plate and the second flow path plate are stacked via the partition plate to form a stacked heat exchanger, and the second flow path is provided at the contact surface between the first flow path plate and the partition plate. A paste-like brazing material is applied to a position facing the flow path of the flow path plate, a contact surface between the second flow path plate and the partition plate, and a position facing the flow path of the first flow path plate. In this method, a brazing material layer is formed by heating and heated under pressure.

Then, the respective plates are securely joined by diffusion welding, and the brazing material is applied to the portions having poor adhesion between the respective plates by a simple method of merely applying a paste brazing material. By providing the layers, the bonding property can be improved, a highly reliable laminated heat exchanger can be provided, and the manufacturing cost can be reduced.

Further, as described in claim 5, a first flow path plate having a primary fluid channel formed in a slit shape, and a second fluid plate having a secondary fluid channel formed in a slit shape. And a plurality of sets in which the first flow path plate and the second flow path plate are stacked via the partition plate to form a stacked heat exchanger, and the second flow path is provided at the contact surface between the first flow path plate and the partition plate. A binder is applied to a position facing the flow path of the path plate, and a contact surface between the second flow path plate and the partition plate, and a position facing the flow path of the first flow path plate. A brazing material is sprayed to form a brazing material layer, and bonding is performed by heating under pressure.

Then, the respective plates are securely joined by diffusion welding, the binder is applied, and the powdery brazing material is sprayed on the binder in a simple manner. Since the brazing material layer is formed on the bad portion, the joining property can be improved.
In addition, it is possible to provide a stacked heat exchanger that has excellent yield and high reliability, and can reduce manufacturing costs.

Further, as described in claim 6, the first flow path plate in which the flow path of the primary fluid is formed in a slit shape, and the first flow path plate in which the flow path of the secondary fluid is formed in a slit shape. 2
A plurality of sets in which a plurality of flow path plates are stacked via a partition plate to form a stacked heat exchanger,
At the contact surface between the flow path plate and the partition plate, and
A sheet-like brazing material at a position facing the flow path of the first flow path plate and at a position facing the flow path of the first flow path plate at a contact surface between the second flow path plate and the partition plate. It is arranged, a brazing material layer is formed, and bonding is performed by heating under pressure.

Then, the respective plates are securely joined by diffusion welding, and a sheet-like brazing material having excellent uniformity is processed into a predetermined shape, and a portion is formed by a simple method of merely disposing between the plates. Thus, a reliable brazing material layer can be formed, and a highly reliable laminated heat exchanger can be provided.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Example 1) FIG. 1 is a schematic diagram showing the configuration of a laminated heat exchanger manufactured according to Example 1 of the present invention. FIG. 1 is partially exploded to explain the internal structure of the stacked heat exchanger.

The heat exchange fluid A flows into the header 3 from the inlet pipe 2 provided on the end plate 1. Header 3,
Numerals 9, 12 and 15 are spaces formed by sequentially laminating a large number of flow path plates 4 and 6 and partition plates 5, which connect the flow paths with the inlet pipes 2 and 11 and the outlet pipes 10 and 16. The heat exchange fluid A that has flowed into the header 3 enters a channel 7 formed in a slit shape in the first channel plate 4 having a flat plate shape. A support portion 8 is provided on a side portion of the flow path 7, and the support portion 8 functions as a portion for supporting the internal pressure when the plates are stacked. The heat exchange fluid A flowing through the flow path 7 is collected in the header 9 and flows out from the outlet pipe 10.

On the other hand, the heat exchange fluid B flows into the header 12 from the inlet pipe 11 and enters the slit 13 formed in the flat plate-shaped second channel plate 6. The flow path 1
A supporting portion 14 is provided on the side of the third member 3 in the same manner as described above. The heat exchange fluid B flowing through the flow path 13 is collected by the header 15 and flows out of the outlet pipe 16.

The partition plate 5 is provided with through holes for forming headers 3, 9, 12, 15 when the respective plates are stacked. Then, a large number of the flow path plates 4, the partition plates 5, 6, and 5 are laminated in this order, and the end plates 1 and 17 are laminated on both upper and lower surfaces, and these are completely adhered and joined to form a laminated heat exchanger. Therefore, the heat exchange fluids A and B do not leak to the outside and do not mix with each other, and flow through the headers 3, 9, 12, 15 and the flow paths 7, 13. At this time, the heat exchange fluid A flowing through the flow path 7 is divided into two partition plates 5 located above and below the heat exchange fluid A.
Can exchange heat with the heat exchange fluid B flowing through the flow path 13.

Next, a method of manufacturing such a laminated heat exchanger will be specifically described with reference to FIG.

FIG. 2 is a cross-sectional view of the lamination type heat exchanger shown in FIG. 1 taken along the arrow CC, and shows the state of installation of the brazing material at the time of lamination.

A first flow path plate 4 and a second flow path plate 6 each having a brazing material layer 18 formed by plating at a predetermined position on the surface between the upper and lower end plates 1 and 17 form a partition plate 5. Are sequentially stacked. The processing of the through holes forming the flow paths 7, 13 and the headers 3, 9, 12, 15 of the flow path plates 4, 6 and the partition plate 5 is performed by press working. The brazing material layer 18 formed on the surfaces of the flow path plates 4 and 6 by plating is, for example,
When the material of each plate is stainless steel, nickel and phosphorus are the main components, and when the material is copper, the main component is silver, and these are usually electroless plated. It is formed by a method or an electroplating method.

However, the material and method for plating are not limited.

The brazing material layer 18 is provided on the surfaces of the flow path plates 4 and 6 and on the support sections 8 and 14 formed on the sides of the flow paths 7 and 13.
And at a position facing the flow path of the adjacent flow path plate via the partition plate 5.

Therefore, the brazing material layer 18 in the case of the second flow path plate 6 is provided on the contact surface with the partition plate 5 and in the first flow path.
Position facing the flow path 7 of the flow path plate 4, ie,
As shown in FIGS. 1 and 2, the support portion 14 of the second flow path plate 6 is formed.

Also, in the case of the first flow path plate 4, FIG.
As shown in (1), a brazing material layer 18 is formed on the support portion 8 of the first flow path plate 4. When plating is performed at a partial position as described above, it can be easily performed by performing a normal plating process after masking a portion that is not plated in advance.

As described above, the flow path plates 4 and 6 in which the brazing material layers 18 are partially formed are stacked via the partition plate 5, and a load is applied from above to pressurize and heat in a state of being in close contact. In this way, integrated joining is performed. At this time, the portions indicated by arrows E on the outer peripheral portions of the respective plates are stacked in a state of being in close contact with each other, and the vertical load at the time of pressurization is sufficiently applied to improve the adhesion between the plates. Therefore, it can be made airtight by diffusion welding.

On the other hand, in the portion indicated by the arrow F, since the flow path 7 of the flow path plate 4 is interposed in the middle, it is difficult to sufficiently apply a vertical load, the adhesion between the plates is impaired, and the cause of poor bonding is caused. Easily. Therefore, in this embodiment, the brazing material layer 18 is provided on the support portions 8 and 14 so that the brazing material is secured between the plates having such poor adhesion. Can be guaranteed. As a result, poor joining near the header 3 or 9 can be avoided, and mixing of the heat exchange fluid A flowing through the headers 3 and 9 and the heat exchange fluid B flowing through the flow path 13 can be prevented.

As described above, the flat flow path plate 4 in which the flow path 7 is formed in a slit shape and the flat flow path plate 6 in which the flow path 13 is formed in a slit shape are replaced by a flat partition plate plate. When a plurality of sets are laminated in the order shown in FIG. 1 and FIG. 2 through the intermediary 5 to produce an airtight and monolithic laminated heat exchanger, the contact surface between the first flow path plate 4 and the partition plate 5 is The support portion 8 and the second flow path plate 6
At a position facing the flow path 13 of the first flow path, and at a position facing the flow path 7 of the first flow path plate 4 at the support portion 14 at the contact surface between the second flow path plate 6 and the partition plate 5. A brazing material layer 18 is formed by plating a material, and is heated under pressure and diffusion-welded. Since the bonding between the plates is performed in this manner, the air-tight bonding between the plates is reliably ensured, and a portion having poor adhesion between the plates, such as a portion facing the flow channel of an adjacent flow channel plate, is ensured. Since the brazing by the brazing material layer 18 formed by plating is guaranteed,
A highly reliable laminated heat exchanger can be provided.

(Embodiment 2) The configuration of the laminated heat exchanger manufactured according to Embodiment 2 of the present invention is the same as that of Embodiment 1, and therefore the description is omitted here. FIG. 3 shows the second embodiment.
Arrow C in FIG.
It shows a cross section at a position C, and shows the installation state of the brazing material at the time of lamination in an easily understandable manner.

In this embodiment, a brazing material layer 19 is applied to the first flow path plate 4 and the second flow path plate 6 at the same positions as in the first embodiment by partially applying a brazing material in paste form. Is formed. That is, in the case of the second flow path plate 6, the support portion 14 of the contact surface with the partition plate 5 is provided.
Then, a brazing material layer 19 is formed at a position facing the flow path 7 of the first flow path plate 4 (see FIG. 3). Further, in the case of the first flow path plate 4, the brazing material layer 1
9 is formed.

As the paste brazing material, there is a mixture obtained by kneading a powdery brazing material into a binder. For example, when the material of the flow path plates 4 and 6 is stainless steel, the paste brazing material is nickel. If the material is copper, a silver material can be used. As a method of applying the paste-like brazing material, there is a quantitative supply by a dispenser. However, in consideration of the uniformity of application, a printing method using a screen is effective.
However, the material and method of application are not limited.

As described above, the flow path plates 4 and 6 in which the paste-like brazing material is partially applied and the brazing material layer is formed are laminated via the partition plate 5, and a load is applied from above to apply pressure. Then, the integrated joining is performed by heating in a state of being in close contact. At this time, the arrow E on the outer periphery of each plate
The parts indicated by are laminated in a state of being in close contact with each other,
Since the vertical load at the time of pressurization is sufficiently applied and the adhesion between the plates is good, the airtightness can be achieved by diffusion welding.

On the other hand, in the portion indicated by the arrow F, since the flow path 7 of the flow path plate 4 is interposed in the middle, the vertical load is hard to be sufficiently applied, the adhesion between the plates is impaired, and the defective connection is likely to occur. . Therefore, in this embodiment, the support portion 8,
Since the brazing material layer 19 is provided on the plate 14 so that the brazing material is ensured even between plates having poor adhesion, good brazing can be guaranteed. As a result, header 3,
In this case, it is possible to avoid a joint failure in the vicinity of 9 and prevent the heat exchange fluid A flowing through the headers 3 and 9 from mixing with the heat exchange fluid B flowing through the flow path 13.

As described above, the flat flow path plate 4 in which the flow path 7 is formed in a slit shape and the flat flow path plate 6 in which the flow path 13 is formed in a slit shape are replaced with the flat partition plate plate 5. When a plurality of sets are stacked in the order shown in FIG. 1 and FIG. 3 to manufacture a laminated heat exchanger having an airtight and integral structure, the first flow path plate 4 and the partition plate 5
At a position facing the flow channel 13 of the second flow path plate 6 and at a support portion 14 at a contact surface between the second flow path plate 6 and the partition plate 5. Further, a brazing material layer 19 is formed by applying a paste-like brazing material to a position facing the flow path 7 of the first flow path plate 4, and is heated under pressure and subjected to diffusion welding. Since the bonding between the plates is performed in this manner, the airtight bonding between the plates is reliably ensured, and the flow path of the adjacent flow path plate is opposed to the flow path of the adjacent flow path plate by a simple method of applying the paste brazing material. As in the case of the parts, the brazing material is provided also in the parts having poor adhesion between the plates, so that the joining property can be improved. And
A highly reliable laminated heat exchanger can be provided, and manufacturing costs can be reduced.

(Embodiment 3) The configuration of the laminated heat exchanger manufactured according to the third embodiment of the present invention is the same as that of the first embodiment, and the description is omitted here. FIG. 4 shows the third embodiment.
Arrow C in FIG.
It shows a cross section at a position C, and shows the installation state of the brazing material at the time of lamination in an easily understandable manner.

In this embodiment, the binder 20 is partially applied to the first flow path plate, the fourth flow path plate, and the second flow path plate at the same positions as those in the first embodiment, and the powder-like binder is applied thereon. A brazing material layer 22 is formed by spraying the brazing material 21. That is, in the case of the second flow path plate 6,
The binder 20 is provided at the support portion 14 on the contact surface with the partition plate 5 and at a position facing the flow path 7 of the first flow path plate 4.
Is applied, and a powdery brazing material is sprayed thereon to form a brazing material layer 22. Since the binder 20 has high viscosity, the powdered brazing material 21 that has been sprayed is
At 0, the brazing material layer 22 is formed. (See FIG. 4). In the case of the first flow path plate 4, the support portion 8
Then, similarly, a layer 22 of a brazing material is formed. When the material of each plate is stainless steel, a nickel-based powder brazing material can be used, and when the material is copper, a silver-based brazing material can be used. Examples of a method of applying the binder 20 include a quantitative supply using a dispenser and a printing method using a screen. Also, in order to spray the powdery brazing material 21,
For example, there is a method using a spray or a sieve.
Note that the powdery brazing material adhered to the portion where the binder 20 is not applied can be easily removed by air blow or the like.

As described above, the binder is applied, the powdery brazing material is sprayed, and the flow path plates 4 and 6 in which the brazing material layer 22 is partially formed are laminated via the partition plate 5. An integrated joining is performed by applying a load, applying pressure, and heating in a state of being in close contact. At this time, the portions indicated by arrows E on the outer peripheral portions of the respective plates are laminated in a state of being in close contact with each other, and the vertical load at the time of pressurization is sufficiently applied, and the adhesion between the plates is also good. Therefore, airtightness can be achieved by diffusion welding.

On the other hand, since the flow path 7 of the flow path plate 4 is interposed in the portion indicated by the arrow F, a sufficient vertical load is hardly applied, and the adhesion between the plates is impaired, which is likely to cause a bonding failure. Therefore, in this embodiment, the binder 2
0, a brazing material layer 22 in which a powdery brazing material 21 is held
Since the brazing material is formed on the supporting portions 8 and 14 so that the brazing material is secured between the plates having poor adhesion, good brazing can be ensured. As a result, it is possible to avoid poor joints in the vicinity of the headers 3 and 9, and the heat exchange fluid A flowing through the headers 3 and 9 and the flow path 13
Mixing with the heat exchange fluid B flowing to the air can be prevented.

As described above, the flat flow path plate 4 in which the flow path 7 is formed in a slit shape and the flat flow path plate 6 in which the flow path 13 is formed in a slit shape are replaced with the flat partition plate plate 5. When a plurality of sets are stacked in the order shown in FIG. 1 and FIG. 4 to manufacture an airtight and integrated laminated heat exchanger, the first flow path plate 4 and the partition plate 5
The support portion 8 of the contact surface of the second flow path plate 6 and the position facing the flow channel 13, and the support portion 14 of the contact surface of the second flow path plate 6 and the partition plate 5, and A binder 20 is applied to a position facing the flow path 7 of the first flow path plate 4, and a powdery brazing material 21 is held thereon to form a brazing material layer 22. And diffusion welding. Since the bonding between the plates is performed in this manner, the airtight bonding between the plates is reliably ensured, and the adjacent flow can be easily applied by simply applying the binder and spraying the powdery brazing material thereon. The brazing material is also installed in a portion where the adhesion between the plates is poor, such as a portion facing the road plate, so that the joining property can be improved. In addition, it is possible to provide a stacked heat exchanger having excellent yield and high reliability, and to reduce manufacturing costs.

(Embodiment 4) The configuration of the laminated heat exchanger manufactured according to Embodiment 4 of the present invention is the same as that of Embodiment 1, and therefore the description is omitted here. FIG. 5 shows the fourth embodiment.
Arrow C in FIG.
It shows a cross section at a position C, and shows the installation state of the brazing material at the time of lamination in an easily understandable manner.

In this embodiment, a partially sheet-shaped brazing material is arranged at the same position as in the first embodiment in the first flow path plate 4 and the second flow path plate 6, and a brazing material layer is formed. 23 are formed. That is, in the case of the second flow path plate 6, the support portion 14 of the contact surface with the partition plate 5 is provided.
Then, a sheet-like brazing material layer 23 cut into a predetermined shape is disposed at a position facing the flow path 7 of the first flow path plate 4. In the case of the first flow path plate 4, a sheet-like brazing material layer 23 is similarly disposed on the support portion 8.

Examples of the sheet brazing material include a foil brazing material made of copper, amorphous nickel, or the like.
It has a substantially uniform thickness and can be easily processed into a free shape by pressing or etching. However, the brazing material is not limited to this.

As described above, the flow path plates 4 and 6 in which the sheet-like brazing material layers 23 are partially arranged are separated from the partition plate 5
, And pressurizing by applying a load from above, and heating in a state of being in close contact to perform integrated joining. At this time, the portions indicated by arrows E on the outer peripheral portions of the respective plates are laminated in a state of being in close contact with each other, and the vertical load at the time of pressurization is sufficiently applied, and the adhesion between the plates is also good. Therefore, airtightness can be achieved by diffusion welding.

On the other hand, in the portion indicated by the arrow F, since the flow path 7 of the flow path plate 4 is interposed in the middle, the vertical load is hardly applied sufficiently, the adhesion between the plates is impaired, and the poor connection is likely to occur. . However, in this embodiment, by disposing the sheet-like brazing material layer 23 on the support portions 8 and 14,
Since the brazing material is secured between the plates having poor adhesion, good brazing can be guaranteed. As a result, it is possible to avoid poor connection in the vicinity of the headers 3 and 9, and the heat exchange fluid A flowing through the headers 3 and 9 and the flow path 1
3 can be prevented from mixing with the heat exchange fluid B.

As described above, the flat flow path plate 4 in which the flow path 7 is formed in a slit shape and the flat flow path plate 6 in which the flow path 13 is formed in a slit shape are replaced with the flat partition plate plate 5. When a plurality of sets are stacked in the order shown in FIG. 1 and FIG. 5 to manufacture an airtight and monolithic laminated heat exchanger, a contact surface between the first flow path plate 4 and the partition plate 5 is formed. The support portion 8 and the second flow path plate 6
At a position facing the flow path 13 of the first flow path and at a position facing the flow path 7 of the first flow path plate 4 at the support portion 14 at the contact surface between the second flow path plate 6 and the partition plate 5. A brazing material layer 23 is formed by arranging a brazing material in a shape, and is heated under pressure and diffusion welded. Since the bonding between the plates is performed in this manner, the airtight bonding between the plates is reliably ensured, the uniformity is excellent, and a very simple method of arranging a sheet-like brazing material layer having good workability is provided. The brazing material layer can be partially formed. Further, a highly reliable laminated heat exchanger can be provided.

In the first to fourth embodiments, the brazing material layer is disposed at all the portions where the vertical load is hardly applied at the time of pressurization. For the part where mixing does not occur, for example, the part where the flow path through which the same fluid flows is adjacent,
The brazing material layer can be omitted. Also, the partition plates 5 have all been described as having the same shape of through-holes, but may have different shapes depending on the flow path configuration. Also,
Although the channels and through holes are formed in each plate by press working, they may be formed by etching or the like.

[0058]

The present invention is embodied in the form described above and has the following effects. According to Claims 1 and 2, a first flow path plate in which the flow path of the primary fluid is formed in a slit shape, and a second flow path plate in which the flow path of the secondary fluid is formed in a slit shape. Are stacked via a partition plate, at a position where the first flow path plate and the partition plate are in contact with each other, and at a position facing the flow path of the second flow path plate, Since the brazing material is positioned on the contact surface of the first flow path plate and opposed to the flow path of the first flow path plate, and the respective plates are bonded by heating in a pressurized state, the bonding between the plates is performed. Is ensured by diffusion welding, and parts with poor adhesion between plates can be brazed with brazing material,
A highly reliable laminated heat exchanger can be provided.

According to the third aspect, the position of the contact surface between the first flow path plate and the partition plate and the position facing the flow path of the second flow path plate, and the position of the second flow path plate and the partition plate Since a brazing material layer is formed by plating at a contact surface of the first flow path plate and a position facing the flow path of the first flow path plate, and heating is performed in a pressurized state, the respective plates are joined to each other. To provide a reliable stacked heat exchanger with high yield, high yield, and high reliability, by ensuring that the bonding between the plates is ensured by diffusion welding, and the parts with poor adhesion between the plates are also securely brazed. Can be.

According to the fourth aspect, the position of the contact surface between the first flow path plate and the partition plate and the position facing the flow path of the second flow path plate, and the position of the second flow path plate and the partition plate. A paste-form brazing material is applied to the contact surface of the first flow path plate and a position facing the flow path to form a brazing material layer, and the plates are joined by heating under pressure. The bonding by diffusion welding is assured, and the brazing material is installed in the poor adhesion between the plates by a simple method of applying the paste-like brazing material to improve the jointability. Thus, a highly reliable laminated heat exchanger can be provided, and the manufacturing cost can be reduced.

According to the fifth aspect, the position of the contact surface between the first flow path plate and the partition plate and the position facing the flow path of the second flow path plate, and the position of the second flow path plate and the partition plate A binder is applied, and a powdery brazing material is scattered to form a brazing material layer at a position in contact with the first flow path plate and a position facing the flow path of the first flow path plate, and heating is performed in a pressurized state. Since each plate is joined by this,
Bonding by diffusion welding is assured, and a simple method of applying a binder and spraying powdery brazing material on it, installing brazing material on poor adhesion between plates to improve bonding It is possible to provide a highly reliable stacked heat exchanger that can increase the yield, improve the yield, and reduce the manufacturing cost.

According to the sixth aspect, the position of the contact surface between the first flow path plate and the partition plate and the position facing the flow path of the second flow path plate, and the position of the second flow path plate and the partition plate A sheet-like brazing material is disposed at a contact surface with the first flow path plate and at a position facing the flow path of the first flow path plate to form a brazing material layer. The joint between the plates ensures that the joint by diffusion welding is ensured, and a simple method of processing a sheet-like brazing material with excellent uniformity into a predetermined shape and arranging it between the plates, The brazing material can also be placed on the bad portion to perform brazing, and a highly reliable laminated heat exchanger can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic structural view of a laminated heat exchanger manufactured according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a main part of the laminated heat exchanger.

FIG. 3 is a schematic cross-sectional view of a main part of a laminated heat exchanger manufactured according to a second embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a main part of a laminated heat exchanger manufactured according to a third embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of a main part of a stacked heat exchanger manufactured according to a fourth embodiment of the present invention.

FIG. 6 is a schematic view of the configuration of a conventional laminated heat exchanger.

FIG. 7 is a schematic cross-sectional view of a main part of the laminated heat exchanger.

[Explanation of symbols]

 4, 6 flow path plate 5 partition plate 7, 13 flow path 18, 19, 22, 23 brazing material layer 20 binder 21 brazing material A, B heat exchange fluid

Claims (6)

[Claims] 1. A plurality of sets in which a first flow path plate having one heat exchange fluid flow path and a second flow path plate having another heat exchange fluid flow path are laminated via a partition plate. Laminated heat exchange in which a brazing material is arranged at a position on the surface of each of the flow path plates facing the flow path of the adjacent flow path plate via the partition plate, and the plates are joined to each other. vessel. 2. A first flow path plate having a heat exchange fluid flow path, and a second heat exchange fluid flow path having a second heat exchange fluid flow path.
A plurality of sets in which the first flow path plate and the second flow path plate are stacked via a partition plate, and a plurality of sets are stacked, and the flow path plate is opposed to the flow path of the second flow path plate at the contact surface between the first flow path plate and the partition plate A brazing material is located at a position, and at a contact surface between the second flow path plate and the partition plate, and at a position facing the flow path of the first flow path plate, and is joined by heating in a pressurized state. Of manufacturing a laminated heat exchanger. 3. A set in which a first flow path plate having one heat exchange fluid flow path and a second flow path plate having another heat exchange fluid flow path are laminated via a partition plate. A plurality of sets, a position facing the flow path of the second flow path plate at the contact surface between the first flow path plate and the partition plate, and the second flow path plate, the partition plate, Forming a plating layer of a brazing material at a position facing the flow path of the first flow path plate at a contact surface of the first flow path plate, and heating and joining in a pressurized state. 4. A set in which a first flow path plate having one heat exchange fluid flow path and a second flow path plate having another heat exchange fluid flow path are laminated via a partition plate. Are stacked on each other, a position of the contact surface between the first flow path plate and the partition plate, and a position facing the flow path of the second flow path plate, and a position between the second flow path plate and the partition plate. Manufacture of a laminated heat exchanger in which a paste-like brazing material is applied to the contact surface and at a position facing the flow path of the first flow path plate to form a brazing material, which is then heated and joined in a pressurized state. Method. 5. A set in which a first flow path plate having one heat exchange fluid flow path and a second flow path plate having another heat exchange fluid flow path are laminated via a partition plate. Are stacked on each other, a position of the contact surface between the first flow path plate and the partition plate, and a position facing the flow path of the second flow path plate, and a position between the second flow path plate and the partition plate. At the contact surface, and at a position facing the flow path of the first flow path plate, a binder is applied, and a powdery brazing material is sprayed thereon to form a brazing material layer, which is heated in a pressurized state. A method of manufacturing a laminated heat exchanger to be joined. 6. A set in which a first flow path plate having one heat exchange fluid flow path and a second flow path plate having another heat exchange fluid flow path are laminated via a partition plate. Are stacked on each other, a position of the contact surface between the first flow path plate and the partition plate, and a position facing the flow path of the second flow path plate, and a position between the second flow path plate and the partition plate. A stacked heat exchanger in which a brazing material layer is formed by disposing a sheet-like brazing material at a contact surface and at a position facing the flow path of the first flow path plate, and heating and joining in a pressurized state. Manufacturing method.