JP7363570B2 - laminate - Google Patents

Description

The present invention relates to a laminate used in a heat exchanger.

A heat exchanger is used as an element of a refrigeration cycle, and is a part that brings the temperature of the working fluid within the refrigeration cycle to a target value. Among them, microchannel heat exchangers are recognized for their excellent performance.

An example of such a microchannel heat exchanger is a stacked microchannel heat exchanger. A stacked microchannel heat exchanger, for example, is formed by alternately stacking metal plates with fine high-temperature fluid channels formed on their surfaces and metal plates with fine low-temperature fluid channels formed on their surfaces. The laminate is sandwiched between pressure-resistant metal plates from above and below, and the metal plates are diffusion-bonded to each other by applying pressure and heating in a vacuum atmosphere (for example, see Patent Document 1). In some cases, such a laminate is connected with piping that allows the working fluid to flow in and out. For example, this piping is inserted into a hole provided in the laminate and then joined to the laminate by brazing in a vacuum or hydrogen atmosphere in a heating furnace.

Patent No. 6056928

However, when brazing piping using a heating furnace, the laminate must be placed in the furnace in an appropriate position to prevent the piping inserted into the hole in the laminate from shifting or tilting. . However, if the size of the laminate is large or a large number of laminates are placed in the furnace at once, it may not be possible to place the laminate in the furnace in an appropriate position.

In such a case, the position of the piping inserted into the laminate may shift from its original position, or the piping may come off the laminate during brazing. Furthermore, when brazing piping inserted from the bottom of the laminate, the piping may come off the laminate due to its own weight, which has been an obstacle to improving the productivity of the laminate.

Therefore, in order to improve the productivity of a laminate provided with piping, there is a need for a laminate in which the piping can be joined to the laminate without depending on the orientation of the laminate when brazing the piping to the laminate.

In view of the above circumstances, an object of the present invention is to improve the productivity of a laminate provided with piping.

In order to achieve the above object, a laminate according to one embodiment of the present invention is a laminate in which a plurality of metal plates are stacked, and each of the plurality of metal plates is bonded by diffusion bonding.
A hole portion into which a pipe is fitted is provided from the uppermost metal plate of the laminate or the lowermost metal plate of the laminate toward the inside of the laminate.
At least one metal plate forming the hole in the laminate is provided with a locking portion for locking the pipe.

With such a laminate, the piping can be joined to the laminate without depending on the orientation of the laminate when brazing the piping to the laminate, improving the productivity of the laminate provided with the piping. .

In the above laminate, at least one metal plate located below the uppermost metal plate or at least one metal plate located above the lowermost metal plate is fitted into the hole. A locking portion for locking the pipe may be provided.

With such a laminate, when the piping is brazed to the laminate using the locking part, the piping can be joined to the laminate without depending on the posture of the laminate, and the laminate on which the piping is installed can be joined to the laminate without depending on the orientation of the laminate. Productivity improves.

In the above laminate, the top layer metal plate or at least one metal plate from the top layer metal plate is arranged from the top layer metal plate or the top layer metal plate toward the inside of the laminate. A locking portion may be provided for locking the piping fitted into the hole.

With such a laminate, when the piping is brazed to the laminate using the locking part, the piping can be joined to the laminate without depending on the posture of the laminate, and the laminate on which the piping is installed can be joined to the laminate without depending on the orientation of the laminate. Productivity improves.

In the above laminate, when the piping fitted in the hole is rotated around the central axis of the hole, a stopper that stops the piping at a predetermined rotation angle is provided at least one stopper that stops the piping at a predetermined rotation angle. It may be provided on one metal plate.

With such a laminate, the piping can be positioned using the stopper, so when brazing the piping to the laminate, the piping can be joined to the laminate without depending on the orientation of the laminate. The productivity of the produced laminate is improved.

In the above laminate, the pipe may be provided with a cover portion that closes the hole when the pipe is fitted into the hole.

In such a laminate, the holes are closed by the cover portion, and the productivity of the laminate provided with piping is improved.

As described above, according to the present invention, the productivity of a laminate provided with piping is improved.

It is a typical perspective view showing an example of the layered product concerning this embodiment. Figure (a) is a schematic perspective view showing an example of a locking part that locks piping provided in a laminate. Figure (b) is a schematic perspective view showing an example in which piping is joined to a laminate. FIG. 3 is a schematic perspective view showing a flow path formed inside a laminate. FIG. 7 is a schematic perspective view showing each of a laminate and piping according to Modification 1. Figure (a) is a schematic top view of piping according to Modification 1. Figure (b) is a schematic top view of a laminate according to Modification Example 1. FIG. 7 is a schematic top view of piping and a laminate showing the effect of Modification 1. FIG. Figure (a) is a schematic top view of piping according to modification 2. Figure (b) is a schematic top view of a laminate according to modification example 2. FIG. 7 is a schematic top view of piping and a laminate showing the effect of Modification 2. FIG. FIG. 7 is a schematic perspective view of piping showing an example of the effect of Modification 2. FIG. FIG. 7 is a schematic perspective view showing each of a laminate and piping according to Modification 3. 7 is a schematic perspective view showing each of a laminate and piping according to Modification 4. FIG. FIG. 7 is a schematic top view of a laminate and piping, showing the effects of Modification 4. FIG.

Embodiments of the present invention will be described below with reference to the drawings. In each drawing, XYZ axis coordinates may be introduced. In addition, the same members or members having the same function may be given the same reference numerals, and the description may be omitted as appropriate after the member has been described.

FIG. 1 is a schematic perspective view showing an example of a laminate according to this embodiment.

The stacked body 10 shown in FIG. 1 is applied to, for example, a stacked microchannel heat exchanger. The laminate 10 has, for example, a substantially rectangular parallelepiped shape. The laminate 10 has a main surface 1u (upper surface), a main surface 1d (lower surface) opposite to the main surface 1u, and a side surface 1w along the stacking direction of the laminate 10. The side surface 1w is connected to the main surface 1u and the main surface 1d.

The side surface 1w is formed along the direction (first direction) in which the plurality of metal plates 2A and 2B are stacked in the stacked body 10. In this embodiment, the first direction corresponds to the Z-axis direction. Further, in the state shown in FIG. 1, it is assumed that the main surface 1u side is the upper side of the laminate 10, and the main surface 1d side is the lower side of the laminate 10.

Furthermore, pipes 51 to 54 are connected to the stacked body 10. For example, in the example of FIG. 1, each of the pipes 51 to 54 is joined to the main surface 1u of the laminate 10. For example, when a high-temperature medium flows in from the pipe 51 of the stacked body 10, the medium passes through the inside of the stacked body 10 and flows out from the pipe 52. On the other hand, when a low-temperature medium flows in from the pipe 53, the medium passes through the inside of the stacked body 10 and flows out from the pipe 54.

The laminate 10 includes a plurality of metal plates 2A, a plurality of metal plates 2B, a metal plate 3A, and a metal plate 3B. The laminate 10 is a laminate in which a metal plate 3A, a plurality of metal plates 2A, 2B, and a metal plate 3B are each bonded by diffusion bonding in this stacking order. Examples of diffusion bonding include solid phase bonding, hot pressure welding, and cold pressure welding. A plurality of metal plates 2A and 2B stacked between the metal plate 3A and the metal plate 3B are collectively made into a laminate 2.

Each of the plurality of metal plates 2A and the plurality of metal plates 2B is a heat transfer plate. The metal plate 3A is a lower outer shell plate. The metal plate 3B is an upper outer shell plate. Between the metal plates 3A and 3B, a plurality of metal plates 2A and a plurality of metal plates 2B are alternately stacked in the Z-axis direction. Moreover, a plurality of metal plates are laminated in each of the metal plate 3A and the metal plate 3B.

Further, in FIG. 1, solid lines are drawn at the boundaries of each of the plurality of metal plates stacked in the stacking direction, but in the diffusion bonded laminate 10, such solid lines disappear without being visible. There is. Furthermore, since the laminate 10 is formed by laminating a plurality of metal plates in the stacking direction, the height (length in the stacking direction) of the laminate 10 is the same as that of each of the metal plates 2A, 2B, 3A, and 3B. Depends on the number of sheets.

A flow path is formed in each of the plurality of metal plates 2A and each of the plurality of metal plates 2B (described later). The pipes 51, 52, 53, and 54 are inserted into the main surface 1u of the laminate 10. The pipes 51 to 54 are joined to the main surface 1u by brazing, for example. For example, the pipes 51 to 54 are arranged so that the direction from the pipe 51 to the pipe 52 and the direction from the pipe 53 to the pipe 54 intersect.

Holes 60 are provided from the uppermost metal plate 3B of the stacked body 10 toward the inside of the stacked body 10, into which the pipes 51 to 54 are fitted. The holes 60 into which the pipes 51 to 54 are fitted are not limited to the upper surface (principal surface 1u) of the laminate 10, but are provided toward the inside of the laminate 10 from the lowest metal plate 3A of the laminate 10. Good too. Note that the present embodiment also includes a laminate 10 in which the pipes 51 to 54 are fitted into the holes 60 and joined to the holes 60.

FIG. 2A is a schematic perspective view showing an example of a locking portion that locks a pipe provided in a laminate. FIG. 2(b) is a schematic perspective view showing an example in which piping is joined to a laminate.

In FIGS. 2(a) and 2(b), a metal plate 3B, which is the upper layer portion of the laminate 10, is shown. Further, in FIG. 2A, the metal plate 3B is shown disassembled in the stacking direction in order to show the locking portion 301 provided inside the stacked body 10. Further, as the piping, a piping 51 is shown in FIGS. 2(a) and 2(b).

For example, as shown in FIG. 2(a), the metal plate 3B includes six metal plates: metal plates 3Ba, 3Bb, 3Bc, 3Bd, 3Be, and 3Bf. Further, the pipes 52 to 54 other than the pipe 51 have the same structure as the pipe 51, and are locked by the locking portion 301 shown in FIG. 2(a).

In the laminate 10, a hole 60 is formed in each of the metal plates 3Ba to 3Bf included in the metal plate 3B. By connecting the holes 60 of the metal plates 3Ba to 3Bf in the stacking direction, a hole 60 dug inward from the main surface 1u of the laminate 10 is formed. The process for forming the holes 60 in each of the metal plates 3Ba to 3Bf is performed by etching, laser processing, precision press processing, cutting, etc. before diffusion bonding.

In the laminate 10, at least one metal plate in which the hole 60 is formed is provided with a locking portion 301 that locks the pipe 51 fitted in the hole 60. For example, the locking portion 301 is provided on at least one metal plate located below the uppermost metal plate 3Ba. For example, in the example shown in FIG. 2A, the locking portion 301 is provided on the third metal plate 3Bc from the top metal plate 3Ba. The locking portion 301 is formed, for example, by a convex portion that protrudes from the inner circumferential surface of the hole 60 toward the central axis 600 of the hole 60 .

Note that when the locking portion 301 is provided on the main surface 1d (lower surface) side of the laminate 10, the locking portion 301 is formed on at least one metal plate 3A located above the lowest metal plate 3A. be done.

The pipe 51 has a locked portion 501, an opening 502, and a passage portion 503. The locked portion 501 and the opening 502 communicate with each other, and the opening 502 and the passage portion 503 communicate with each other. Further, the passage portion 503 is formed by cutting out the lower end 51d of the pipe 51 and is open in the direction of the central axis 500 of the pipe 51.

The passage portion 503 is a groove that allows the locking portion 301 to pass in the direction of the central axis 500 of the pipe 51. The opening 502 is a space that allows the locking part 301 that has passed through the passage part 503 to have play from above the passage part 503 to above the locked part 501. The locked portion 501 is a recess that engages with the locking portion 301 in the direction of the central axis 500.

For example, when the pipe 51 is inserted into the hole 60 from the main surface 1u side, the locking part 301 passes through the passage part 503 of the pipe 51 inside the laminate 10 and reaches the opening 502. Then, when the pipe 51 is rotated clockwise around the central axis 500, the locking portion 301 is located directly above the locked portion 501. Thereafter, the pipe 51 is pulled up in the opposite direction to the direction in which the pipe 51 is inserted into the hole 60, and the locking part 301 is fitted and locked in the stacking direction by the locked part 501.

Thereby, the piping 51 becomes difficult to come off from the hole 60, and furthermore, it becomes difficult to rotate around the central axis 500, and so-called rotational deviation becomes difficult to occur. Further, even if the stacked body 10 is turned sideways from the state shown in FIG. 1, or even if the main surfaces 1u and 1d are reversed by 180 degrees, the pipes 51 are difficult to come off from the holes 60.

Thereafter, the pipe 51 and the laminate 10 are placed in a heating furnace (not shown) and bonded to the laminate 10 with a brazing material 61 (FIG. 2(b)). At this time, in the heating furnace, the main surface 1u of the laminate 10 may be stored with the main surface 1u facing upward, the laminate 10 may be stored horizontally, or the main surface 1u and the main surface 1d may be reversed by 180 degrees. It may also be stored. Furthermore, the joining method is not limited to brazing using a heating furnace and the brazing material 61, but may also be arc welding, laser welding, or the like.

Here, an example of the structure of the metal plates 2A, 2B and the process of forming the laminate 10 by diffusion bonding before the pipes 51 to 54 are joined to the laminate 10 will be described.

FIGS. 3A and 3B are schematic perspective views showing flow channels formed inside the laminate. FIG. 3(a) shows the structure of the metal plate 2A, and FIG. 3(b) shows the structure of the metal plate 2B.

The metal plate 2A shown in FIG. 3A has a main surface 2u, a main surface 2d opposite to the main surface 2u, and a side surface 2w continuous with the main surface 2u and the main surface 2d.

The metal plate 2A is provided with openings 212, 222, 232, and 242 on each of the four sides of its outer peripheral edge. Further, the main surface 2u of the metal plate 2A is provided with grooves 25A, 30A, and 31A that form flow paths for high-temperature fluid. The grooves 25A, 30A, and 31A are formed on one surface of the metal plate 2A by, for example, a half-etching technique.

The depths of the grooves 25A, 30A, and 31A may be uniform at all locations. The plurality of grooves 25A are formed along the X-axis direction. The number of grooves 25A is not limited to the three illustrated. Further, the shape of the groove 25A is not limited to a straight line, but may be any curved shape. Grooves 30A and 31A are formed along the Y-axis direction. One end of the groove 30A communicates with the opening 212. One end of the groove 31A communicates with the opening 222.

The metal plate 2B shown in FIG. 3(b) has a main surface 2u, a main surface 2d, and a side surface 2w. The material of the metal plate 2B is the same as that of the metal plate 2A.

The metal plate 2B is provided with openings 212, 222, 232, and 242 on each of its four sides. Furthermore, the main surface 2u of the metal plate 2B is provided with a groove 25B that forms a flow path for the low-temperature fluid. The groove 25B is formed on one surface of the metal plate 2B by, for example, a half-etching technique. The plurality of grooves 25B are formed along the X-axis direction. The number of grooves 25B is not limited to the three illustrated. Furthermore, the shape of the groove 25B is not limited to a straight line, but may be any curved shape. The groove 25B has one end communicating with the opening 232 and the other end communicating with the opening 242.

The process for forming the grooves and openings described above may include laser processing, precision press processing, cutting processing, etc. in addition to etching processing before diffusion bonding.

A metal plate 2A (FIG. 3(b)) and a metal plate 2B (FIG. 3(a)) are alternately stacked on the metal plate 3A shown in FIG. The plates 3B (metal plates 3Ba to 3Bf) are stacked. Thereafter, the metal plates 3A, 2A, 2B, and 3B stacked in the stacking direction are, for example, pressurized in the Z-axis direction and diffusion bonded in a reduced pressure atmosphere. Thereby, each of the openings 212, 222, 232, and 242 formed in the plurality of metal plates 2A communicates with each of the openings 212, 222, 232, and 242 formed in the plurality of metal plates 2B.

Further, in the stacked body 10, each of the openings 212, 222, 232, and 242 communicates with the hole 60 of the metal plate 3B located above each opening. Since the pipes 51 to 54 are connected to each hole, the opening 212 communicates with the pipe 51, the opening 222 communicates with the pipe 52, and the opening 232 communicates with the pipe 53. , the opening 242 will communicate with the piping 54. In this process, a laminate 10 that is used in heat exchangers and the like is formed.

When brazing piping to a laminate in a heating furnace, the laminate must be placed in the furnace in an appropriate position to prevent the piping inserted into the hole in the laminate from shifting, tilting, or coming off. placed inside. However, if the size of the laminate is large or a large number of laminates are placed in the furnace at once, it may not be possible to place the laminate in the furnace in an appropriate position. In such a case, the position of the pipe may shift from its original position, or the pipe may come off from the laminate during brazing.

On the other hand, according to the laminate 10 according to the present embodiment, since the pipes 51 to 54 are locked to the laminate 10, the pipes 51 to 54 are brazed, for example, with the laminate 10 turned sideways. The positions of the pipes 51 to 54 are unlikely to shift from their original positions. Furthermore, the pipes 51 to 54 do not come off from the laminate 10 during brazing. Further, there is no need to temporarily fix the pipes 51 to 54 by TIG (Tungsten Inert Gas) welding or the like before brazing, and the productivity of the laminate 10 can be improved.

Further, according to the laminate 10 according to the present embodiment, for reasons of productivity, even if a plurality of laminates are placed horizontally in a heating furnace and brazed, the positions of the pipes 51 to 54 are It is difficult to shift from the original position, and the pipes 51 to 54 will not come off from the laminate 10 during brazing.

Further, according to the laminate 10 according to the present embodiment, since the pipes 51 to 54 are locked to the laminate 10, for example, the pipes 51 to 54 can be attached to the lower surface (principal surface 1d) of the laminate 10. Even when brazing is performed, the positions of the pipes 51 to 54 do not easily shift from their original positions, and the pipes 51 to 54 do not fall from the laminate 10 due to their own weight during brazing.

In particular, in this embodiment, for example, the metal plates 3Ba, 3Bb and the metal plates 3Bd to 3Bf are stacked above and below the metal plate 3Bc including the locking part 301 formed by etching, and the hole 60 is formed by diffusion bonding. Therefore, the locking portion 301 can be formed inside the hole 60 by a simple method without relying on complicated three-dimensional processing.

In this way, by applying the laminate 10 of this embodiment as a laminate to which the pipes 51 to 54 are joined, the pipes can be easily joined and the productivity of the laminate provided with the pipes is improved.

(Modification 1)

FIG. 4 is a schematic perspective view showing each of a laminate and piping according to Modification 1.

In the stacked body 10, the pipe 55 fitted in the hole 60 is locked to at least one metal plate from the top metal plate 3Ba toward the inside of the stack 10 from the top metal plate 3Ba. A locking portion 311 may be provided. The pipe 55 has the same outer diameter as the pipes 51 to 54.

For example, in the example shown in FIG. 4, locking portions 311 that lock the pipe 55 in the stacking direction are provided on the uppermost metal plate 3Ba and the metal plate 3Bb immediately below the metal plate 3Ba. The locking portion 311 is formed by an eaves portion that locks the locked portion 552 of the pipe 55 in the stacking direction. Such a locking portion 311 may be provided on at least one metal plate 3A from the lowest metal plate 3A toward the inside of the stacked body 10.

In the laminate 10, the holes 60 include, for example, a hole 601 formed in a pair of metal plates 3Ba and 3Bb, a hole 602 formed in a pair of metal plates 3Bc and 3Bd, and a hole 602 formed in a pair of metal plates 3Bc and 3Bd. It is formed by the holes 603 formed in the plates 3Be and 3Bf. The shapes of the holes 601, 602, and 603 are different.

The pipe 55 has a main body portion 551 and a locked portion 552. The outer diameter of the main body part 551 is the inner diameter of the hole 60 provided in the metal plates 3Ba and 3Bb, the inner diameter of the hole 60 provided in the metal plates 3Bc and 3Bd, and the hole provided in the metal plates 3Be and 3Bf. smaller than the inner diameter of 60 mm.

FIG. 5A is a schematic top view of piping according to Modification 1. FIG. 5(b) is a schematic top view of a laminate according to modification 1.

The locked portion 552 of the pipe 55 is provided around the outer peripheral surface 553 of the pipe 55 as shown in FIG. 552a and a portion 552b connecting the portions 552a. In the example of Modification 1, two blade portions 552a are provided at intervals of 180 degrees. In other words, the central shaft 500 is sandwiched between the two blade portions 552a. For example, the locked portion 552 is formed by appropriately combining techniques such as basil machining, mechanical cutting, laser machining, and electrical discharge machining. The locked portion 552 is locked to a locking portion 311 formed on the metal plates 3Ba and 3Bb.

For example, as shown in FIG. 5(a), in a plane perpendicular to the central axis 500, the outer periphery of the locked portion 552 is defined by two parallel lines sandwiching the central axis 500, and two parallel lines sandwiching the central axis 500. It is formed by two circular arcs intersecting each of two parallel lines. The planar shape of the locked portion 552 is a so-called H-cut shape, in which the opposing short sides of a rectangle are replaced with circular arcs, or a circle centered on the central axis 500 with a circle on both sides of the center. This corresponds to a shape in which two opposing regions are replaced with straight lines that are parallel to each other. Therefore, the locked portion 552 has a longer length between opposing circular arcs, and a shorter length between opposing parallel lines.

Here, the maximum length of the locked portion 552 in the longitudinal direction is assumed to be D1. Further, the length of the locked portion 552 in the lateral direction is D4. Further, the outer diameter of the main body portion 551 is assumed to be D3.

Further, the hole 60 includes, for example, a first hole 601, a second hole 602, and a third hole 603, as shown in FIG. 5(b). Here, the planar shape of the first hole 601 has a shape that is substantially similar to the planar shape of the locked portion 552, for example. The planar shape of the second hole 602 and the third hole 603 is, for example, circular. Here, the maximum length of the first hole 601 is D2m, and the width of the first hole 601 is D5. The inner diameter of the second hole 602 is assumed to be D2. The inner diameter of the first hole 601 is assumed to be D5.

Regarding these D1 to D6 and D2m, there is a relationship of D2, D2m>D1>D5>D4>D6>D3. D2m and D2 may have the same length.

FIGS. 6A and 6B are schematic top views of piping and a laminate showing the effect of Modification 1. FIGS.

For example, since D2m>D1, D5>D4, and D6>D3, when the pipe 55 is inserted into the hole 60, the locked part 552 of the pipe 55 becomes It fits into the first hole 601 without being caught in the first hole 601.

Furthermore, since D2>D1>D4, the pipe 55 can be lowered further. For example, the height of the pipe 55 may be adjusted so that the locked part 552 of the pipe 55 passes through the first hole 601 and the locked part 552 is located at the height of the second hole 602. I can do it. At this time, the main body portion 551 below the locked portion 552 is accommodated in the third hole portion 603 because D6>D3.

Next, since D2>D1, the locked part 552 of the pipe 55 can be rotated 90 degrees within the hole 602, as shown in FIG. It can be located under the stop part 311. As a result, the locked portion 552 (wing portion 552a in FIG. 5) is locked by the locking portion 311 in the stacking direction. The piping 55 is also locked to the laminate 10 by such a combination of the laminate and the piping.

(Modification 2)

FIG. 7A is a schematic top view of piping according to Modification 2. FIG. FIG. 7(b) is a schematic top view of a laminate according to modification example 2.

In the laminate 10, the stopper 314 may be provided on at least one metal plate forming the hole 60. This stopper 314 prevents the rotational movement of the piping 55 about the central axis 500 at a predetermined rotation angle when the piping 55 fitted in the hole 60 is rotated around the central axis 600 of the hole 60. make it stop.

For example, as shown in FIG. 7(a), a notch 554 is provided in the locked portion 552 of the pipe 55. Further, as shown in FIG. 7(b), the metal plate 3Bc is provided with a stopper 314 that restricts the rotation of the pipe 55 by abutting the notch 554 when the pipe 55 is rotated about the central axis 500. It is being The stopper 314 may also be provided on the metal plate 3Bd directly below the metal plate 3Bc.

FIGS. 8(a) and 8(b) are schematic top views of piping and a laminate showing the effect of modification 2. FIGS. 9A and 9B are schematic perspective views of piping showing an example of the effect of Modification 2. FIGS.

For example, when the pipe 55 is inserted into the hole 60, the locked portion 552 of the pipe 55 fits into the first hole 601 without being caught in the first hole 601, as shown in FIG. 8(a). Furthermore, the height of the pipe 55 is adjusted so that the pipe 55 is lowered and the locked portion 552 is located at the height of the second hole 602.

Next, as shown in FIG. 8(b), when the piping 55 is rotated 90 degrees within the second hole 602, the notch 554 provided in the locked portion 552 hits the stopper 314, and the piping 55 Rotation is regulated. The piping 55 is also locked to the laminate 10 by such a combination of the laminate and the piping.

According to the second modification example, when the pipe 55 is bent in an L-shape as shown in FIG. The orientation of the piping can be fixed by orienting the piping 55 in a desired direction and then brazing it. Further, as shown in FIG. 9(b), when a fixing jig such as a nut is formed at the end of the pipe 55, by applying a stopper 314 to the pipe 55, the orientation of one side of the nut of the fixing jig can be adjusted to a desired direction. It is possible to set the direction of

(Modification 3)

FIG. 10 is a schematic perspective view showing each of a laminate and piping according to Modification 3.

The locked portion of the piping 55 that is locked to the locking portion of the laminate 10 may not be formed around the outer peripheral surface 553 of the piping 55 but may be provided on at least a portion of the outer peripheral surface 553. .

For example, in the piping 55 shown in FIG. 10, a locked portion 555 that is convex in a direction away from the outer circumferential surface 553 is provided on a part of the outer circumferential surface 553. The locked portion 555 is formed by appropriately combining techniques such as bulge machining, mechanical cutting, laser machining, and electric discharge machining.

Further, the fourth hole 601A provided in the metal plates 3Ba and 3Bb has a notch 604 through which the locked portion 555 passes. The fourth hole 601A has an inner diameter that allows the main body 551 of the pipe 55 to pass therethrough.

When the pipe 55 is inserted into the hole 60 so that the locked part 555 of the pipe 55 passes through the notch 604, the pipe 55 is inserted so that the locked part 555 is located at the height of the second hole 602. height is adjusted. Then, when the pipe 55 is rotated to a predetermined rotation angle in the hole 60, the locked part 555 is located under the metal plates 3Ba and 3Bb in the second hole 602, and the locked part 555 are locked by metal plates 3Ba and 3Bb in the stacking direction.

According to the third modification, the fourth hole 601A is provided with a notch 604 through which the locked portion 555 provided on a part of the outer circumferential surface 553 passes, so that the opening area of the fourth hole 601A is It is smaller than the opening area of the four-hole portion 601. Thereby, when joining the pipe 55 to the laminate 10, it is possible to suppress the brazing material 61 from flowing into the hole 60. Note that the second hole 602 may be provided with a stopper 314 that stops the rotational movement of the pipe 55 about the central axis 500.

(Modification 4)

FIG. 11 is a schematic perspective view showing each of a laminate and piping according to modification 4. FIG. 12 is a schematic top view of the laminate and the piping, showing the effect of Modification 4.

As shown in FIG. 11, the pipe 55 is provided with a cover portion 556 above the locked portion 552 that closes the hole portion 60 from the main surface 1u side. The cover portion 556 is formed by appropriately combining techniques such as bulge machining, mechanical cutting, laser machining, and electrical discharge machining. When the piping 55 having such a cover portion 556 is fitted into the hole 60 or when the piping 55 is rotated, the first hole in the uppermost layer forming the hole 60 is removed as shown in FIG. The gap between the pipe 601 and the pipe 55 is easily closed by the cover part 556 from the main surface 1u side.

According to such a structure, even if the pipe 55 is joined to the hole 60 of the laminate 10 using the brazing material 61, the flow of the brazing material 61 into the hole 60 can be more reliably suppressed. Furthermore, the cover portion 556 can prevent the problem of melted brazing material flowing out toward the tip of the pipe due to its own weight when the pipe is inserted and brazed on the lower surface of the laminate. Further, airtightness between the first hole portion 601 and the pipe 55 can be easily ensured.

Furthermore, by brazing the cover portion 556 to the laminate 10, the area to be brazed to the laminate 10 becomes larger by the amount of the cover portion 556, compared to the case where piping without the cover portion 556 is brazed. , the strength after brazing is improved. Additionally, the cover portion 556 improves the appearance.

Further, if the cover part 556 is not provided, it is necessary to use a large amount of brazing material 61 to close the first hole part 601, but if the cover part 556 is provided, a large amount of brazing material 61 is not required and the first hole part 601 is closed. The hole 601 can be closed. This leads to improved productivity.

Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to the above-described embodiments and can be modified in various ways. Each embodiment is not necessarily an independent form, and can be combined to the extent technically possible.

1d, 1u, 2u, 2d...Main surface 1w, 2w...Side surface 2, 10...Laminated body 2A, 2B, 3A, 3B...Metal plate 25A, 25B, 30A, 31A...Groove 51d...Lower end 51, 52, 53, 54 , 55... Piping 60, 601, 601A, 602, 603... Hole 61... Brazing material 212, 222, 232, 242... Opening 301, 311... Locking part 314... Stopper 500, 600... Central axis 501, 552, 555... Locked part 502... Opening part 503... Passing part 551... Main body part 552a... Wing part 552b... Portion 553... Outer peripheral surface 554, 604... Notch part 556... Cover part

Claims (6)

A laminate in which a plurality of metal plates are stacked, each of the plurality of metal plates being joined by diffusion bonding,
A hole portion is provided into which a pipe is fitted from the uppermost metal plate of the laminate or the lowermost metal plate of the laminate toward the inside of the laminate,
A laminate, wherein at least one metal plate forming the hole in the laminate is provided with a locking portion for locking the pipe. The laminate according to claim 1,
The piping fitted in the hole is locked to at least one metal plate located below the top metal plate or at least one metal plate located above the bottom metal plate. A laminate with a locking part. The laminate according to claim 1,
From the top layer metal plate or the top layer metal plate toward the inside of the laminate, the top layer metal plate or at least one metal plate from the top layer metal plate is fitted into the hole. A laminate including a locking portion that locks the combined pipes. The laminate according to claims 1 to 3,
When the piping fitted in the hole is rotated around the central axis of the hole,
A laminate, wherein a stopper for stopping the piping at a predetermined rotation angle is provided on at least one metal plate forming the hole. The laminate according to claims 1 to 4,
When the piping is fitted into the hole,
A laminate, wherein the piping is provided with a cover portion that closes the hole portion. The laminate according to claims 1 to 5,
A laminate in which the piping is fitted into the hole.

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