JP2015025649A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-pass type heat exchanger in which a header plate does not exist.SOLUTION: The inside of a header 4 is bisected by a partition 6, and a distal end portion of the partition 6 is connected to an expanded part 1a of a flat tube 1.

Description

  The present invention relates to a two-pass type heat exchanger in which a large number of plates are stacked.

  As a heat exchanger in which a large number of plates are stacked, various patent documents 1 and others have been proposed. In the example of Patent Document 1, a flat tube has widened portions that are widened in the thickness direction at both ends, and a large number of flat tubes are laminated at the widened portion to form a core. Is. Between the flat tubes, the flat tubes are brought into close contact with each other only at the expanded portion to form a core. Therefore, the conventional header plate is not required. There is also known a stacked heat exchanger in which a pair of parallel bar members are alternately arranged in a cross-beam shape and plates are stacked between the bar members.

  As a U-turn type heat exchanger, a U-turn type EGR cooler disclosed in Patent Document 2 below is known. This has a header that is divided into two by a partition at one end of the core and a U-turn header that is disposed at the other end. The header partition on one end side of the header partition is airtightly joined to the inner wall of the header and the inner wall of the header plate. And exhaust gas is introduced from one side of the bisected header, each flat tube in one half of the core is circulated and U-turned in the header on the other end, and the inside of each flat tube in the other half is circulated, It leads it to the outside. And cooling water flows in into the casing provided in the outer periphery of the core, and heat exchange is performed between the cooling water and the exhaust gas.

JP 2013-96932 A JP 2010-127171 A

  It is an object of the present invention to provide a heat exchanger that can take a U-turn type flow path (two-pass type) in a conventional heat exchanger in which plates are laminated.

In the heat exchanger according to claim 1, a large number of plates (17) are laminated, and a core (2) having a flat flow path is formed between a pair of plates facing each other. In a heat exchanger in which a header (4) is provided at one end and a U-turn tank (5) is connected to the other end,
The inside of the header (4) is an intermediate portion in the stacking direction of each flat channel, and is divided into two by a partition (6), and the tip of the partition (6) is the tip of the plate (17) of the flat channel It is the heat exchanger characterized by being connected by brazing.

The heat exchanger according to claim 2 is the heat exchanger according to claim 1,
In the heat exchanger, the tip of the partition (6) is in line contact with the tip edge of the plate (17), and the plate (17) and the partition (6) are brazed at the line contact portion.

According to a third aspect of the present invention, each plate (17) is formed in a groove shape, and a pair of opposing plates (17) are fitted together to form a flat tube (1), and the flat tube (1) has an expanded portion (1a) that is expanded in the thickness direction at both ends thereof,
A plurality of flat tubes (1) are laminated at the expanded portion (1a) to constitute the core (2), and the outer periphery of the core (2) is fitted with the casing (3), and the core (2) In a heat exchanger in which a header (4) is disposed at one end in the flow direction of the above, and each component is fixed by brazing.
A box-shaped U-turn tank (5) is connected to the other end of the core (2) in the flow direction,
The inside of the header (4) is divided by a partition (6) in the middle of the flat tube (1) in the stacking direction, and the tip of the partition (6) is an expanded portion of the flat tube (1) ( A header plateless heat exchanger connected to 1a).

According to a fourth aspect of the present invention, in the heat exchanger according to the third aspect,
The header (4) has a rectangular cylindrical portion whose inner circumference is aligned with the outer circumference of the core (2), and a bridging portion (4a) is provided at a central position on the inlet side, and the bridging portion (4a ) In the middle of the holding section (4b) having a U-shaped cross section,
The partition (6) has a base (6a) and a partition (6b) extending from the base (6a) to the core (2) side,
The base portion (6a) has a groove-shaped portion (6c) that is bent in a U-shaped cross section at the middle portion in the longitudinal direction, and the outer periphery of the groove-shaped portion (6c) is the holding portion (4b) of the header (4). ), The L-shaped crossing angle between the partition part (6b) and the base part (6a) is maintained as perpendicular as possible at the time of brazing. This is a header plateless heat exchanger.

The present invention according to claim 5 is the heat exchanger according to claim 4,
With the groove (6c) of the partition (6) facing the opening of the flat tube (1), the partition (6b) is in contact with the inner surface of the widened portion (1a) of the flat tube (1). It is a header plateless type heat exchanger which is arranged in the above and suppresses deformation of the partition portion (6b) during brazing due to the contact.

The present invention described in claim 6 is the heat exchanger according to claim 3,
It is a header plateless type heat exchanger in which the thickness of the header (4) is larger than the thickness of the partition (6).

The present invention according to claim 7 has a plurality of flat tubes (1) formed with widened portions (1a) that are widened in the thickness direction at both ends in the flow direction of the internal fluid. The tube (1) is laminated with the expanded portion (1a) to constitute the core (2), and the outer periphery of the core (2) is fitted with the casing (3), and the circulation of the core (2) In the heat exchanger in which the header (4) is arranged at one end in the direction and each part is fixed by brazing,
Inside each flat tube (1), an inner fin (12) bent into a waveform is inserted, and the inner fin (12) is formed such that the side wall of each wave is linearly continuous in the flow direction,
The opening of the box-shaped tank for U-turn (5) is connected to the other end in the flow direction of the core (2),
The inside of the header (4) is divided into two by a partition (6) orthogonal to the stacking direction of the flat tube (1), and a plurality of tongue pieces (8) are slits (at the tip of the partition (6)). 7) header plateless type heat exchange, wherein each tongue piece (8) is inserted into the widened portion (1a) of each flat tube (1), being spaced apart from each other via 7) It is a vessel.

The heat exchanger according to claim 8 is the heat exchanger according to claim 7,
The plane of the tip of the partition (6) intersects the plane of the expanded portion (1a) of the flat tube (1) and makes a linear contact, and the contact portion and its vicinity are integrally brazed. It is a header plateless type heat exchanger characterized by being fixed.

  According to the first aspect of the present invention, in the heat exchanger in which a large number of plates 17 are stacked, the inside of the header 4 is divided into two by a partition 6 at an intermediate position in the stacking direction of each flat flow path. Is connected to the tip of the flat channel plate 17 by brazing. Therefore, the partition structure can be easily formed.

  In the heat exchanger according to claim 2, in the heat exchanger, the tip of the partition 6 is in line contact with the tip edge of the plate 17, and the plate 17 and the partition 6 are connected at the line contact portion. It is brazed. Therefore, it is possible to prevent the leakage of the fluid while reducing the change in the temperature distribution of the connecting portion and preventing the brazing portion from being separated due to thermal strain while making the brazing portion of the partition linear.

The present invention according to claim 3 is a header plateless type heat exchanger without a header plate, wherein the opening of the box-shaped U-turn tank 5 is connected to the other end of the core 2 in the flow direction, The inside of the header 4 is divided into two by a partition 6 in the middle of the stacking direction of the flat tubes, and the tip of the partition 6 is connected to the widened portion 1 a of the flat tube 1.
According to the present invention, the connection structure between the distal end portion of the partition 6 and the widened portion 1a of the flat tube can constitute a U-turn channel in heat exchange without the header plate. It is possible to provide a heat exchanger with long heat exchange performance.

  In addition to the above configuration, as described in claim 4, the outer periphery of the groove-like portion 6c of the partition 6 is fitted and fastened by the holding portion 4b of the header 4, so that the partition portion 6b When the L-shaped crossing angle between the base 6a and the base 6a is maintained at a right angle as much as possible, the airtightness between the partition 6 and the flat tube 1 is maintained and a U-turn type flow path is formed. It is possible to provide a heat exchanger with good heat exchange performance.

  In addition to the above configuration, as described in claim 5, with the groove 6c of the partition 6 facing the opening of the flat tube 1, the partition 6b is formed on the inner surface of the expanded portion 1a of the flat tube 1. A header plate that can be arranged so as to abut and that can improve the airtightness between the partition 6 and the flat tube 1 when the abutment prevents the partition 6b from being deformed during brazing. Less-type heat exchanger.

  In addition to the above configuration, when the thickness of the header 4 is thicker than the thickness of the partition 6 as described in claim 6, the L-shape of the partition portion and the base portion during brazing Is maintained at a right angle, and the airtightness between the partition 6 and the flat tube 1 is ensured, and a header plateless heat exchanger with good heat exchange performance can be provided.

In the invention according to claim 7, the inside of the header 4 is divided into two by a partition 6 in the middle of the direction orthogonal to the stacking direction of the flat tubes, and a plurality of tongue pieces 8 are slit at the tip of the partition 6. 7, the tongue pieces 8 are arranged in parallel with each other, and the widened portions 1 a of the flat tubes 1 are inserted. Inside each of the flat tubes 1, inner fins 12 that are bent in a corrugated shape are inserted, and the inner fins 12 are formed such that the side walls of each wave are linearly continuous in the flow direction.
According to the present invention, in a heat exchanger without a header plate, the partition 6 is arranged in a direction perpendicular to the stacking direction of the flat tubes 1, and each flat tube 1 is divided into two to constitute a U-turn type flow path. can do.

  According to an eighth aspect of the present invention, in the heat exchanger according to the seventh aspect, the tip end plane of the partition 6 intersects the plane of the expanded portion 1a of the flat tube 1 in a linear manner. The contact portion and the vicinity thereof are integrally brazed and fixed. Therefore, in the header plateless type heat exchanger, the brazing part of the partition is linear, preventing the leakage of the fluid, while reducing the change in the temperature distribution of the connection part, Separation can be prevented.

The disassembled perspective view of the header plateless heat exchanger of this invention. Explanatory drawing which shows the assembly | attachment state of the header 4 and the partition 6 of the same heat exchanger. The side view which shows the assembly | attachment state of the heat exchanger. The longitudinal cross-sectional view of the same heat exchanger. The principal part enlarged view of the heat exchanger. The perspective view which shows the whole header plateless heat exchanger of this invention. The principal part cross-section perspective view of FIG. Explanatory drawing which shows the deformation | transformation at the time of brazing of the partition 6 of the same heat exchanger. Explanatory drawing of the deformation | transformation in the brazing of the partition. Explanatory drawing which shows the means to suppress the deformation | transformation. The disassembled perspective view of the header plateless heat exchanger of 2nd Example of this invention. The principal part longitudinal cross-sectional view of the same heat exchanger. FIG. 13 is an XIII-XIII arrow view of FIG. 12. It is a modification of the heat exchanger of FIG. 2, Comprising: Explanatory drawing which shows the assembly | attachment state of the header 4 and the partition 6. FIG. The side view which shows the assembly | attachment state of the heat exchanger of FIG. The principal part longitudinal cross-sectional view of the other Example of this invention. Enlarged view of the main part The principal part longitudinal cross-sectional view of the further another Example of this invention. The principal part enlarged view. Figure XX-XX arrow sectional drawing.

Next, embodiments of the present invention will be described with reference to the drawings.
1 to 10 show a first embodiment of the present invention. As shown in FIG. 1, this header plateless heat exchanger is disposed at both ends of a core 2 composed of a laminate of a number of flat tubes 1. It has a U-turn tank 5, a header 4, and a casing 3 that fits the outer periphery of the core 2.
Each flat tube 1 is composed of a fitting body of a pair of upper and lower groove-shaped plates, and both longitudinal ends thereof are expanded in the thickness direction to form an expanded portion 1a. In the expanded portion 1a, the respective flat tubes 1 are laminated and integrally brazed and fixed to form the core 2.

The casing 3 includes a groove-shaped casing body 3a and a lid portion 3b that closes a lower end opening thereof. One end of a pair of inlet / outlet pipes 13 communicates with both longitudinal ends of the casing body 3a. As shown in FIG. 4, the opening of a relatively short cylindrical header 4 is fitted to one end of the core 2, and the opening of the U-turn tank 5 is connected to the other end of the core 2.
As shown in FIGS. 2 and 3, the header 4 is formed integrally with a cylindrical portion and a bridging portion 4a that horizontally crosses the center of the inlet side, and a longitudinal intermediate portion of the bridging portion 4a is a groove. The holding part 4b is formed in a shape. The groove 6c of the partition 6 is fitted into the holding part 4b. Preferably, the header 4 is thicker than the partition 6. The reason is that the partition 6 is firmly fastened by the holding portion 4 b of the header 4. However, both can have the same thickness.

  The partition 6 has a base portion 6a that substantially matches the bridging portion 4a and a partition portion 6b that is orthogonal thereto. A groove-like portion 6c is bent in the middle in the longitudinal direction of the base portion 6a. Then, at the position of the groove-like portion 6c, the outer periphery thereof is fitted into the holding portion 4b of the header 4, and the holding portion 4b is crimped in the width direction to fasten the outer periphery of the base portion 6a. In FIG. 5, the upper surface of the partition 6 b comes into contact with the lower surface inside the widened portion 1 a of the flat tube 1. Further, in this example, a flange 9 is disposed outside the header 4. The flange 9 has a frame-shaped outer peripheral portion 9a and a bridging portion 9b disposed at the center thereof. Then, the bridging portion 9 b comes into contact with the bridging portion 4 a of the header 4.

The header 4 and the bridging portion 9b are integrally brazed and fixed.
Note that a brazing material is coated or applied to at least one of the members connected to each other. Each part is assembled as shown in FIGS. 4 and 5 and inserted into a high-temperature furnace with its outer periphery fastened by a jig, and the whole is integrally brazed and fixed.

FIG. 8 shows the action of the partition 6 in the furnace during the brazing.
The partition 6 has a base portion 6a and a partition portion 6b orthogonal to the base portion 6a, which are bent by press molding. Then, the partition 6 has residual distortion at the time of molding. Therefore, when heated in the furnace, the partition 6b is deformed from the solid line state to the chain line state with respect to the base part 6a based on the residual stress. Note that the amount of movement is small. In the figure, it is shown larger for explanation. Then, as shown in FIG. 9, when the partition 6 comes into contact with the inner surface of the lower end of the expanded portion 1a of the flat tube 1, the partition 6 is deformed from a solid line state to a chain line state, and the two are separated. Airtightness is impaired.

Therefore, preferably, as shown in FIG. 10, the partition portion 6b is arranged at a position where the deformation direction of the partition 6 is suppressed.
That is, the outer surface of the partition 6b is brought into contact with the inner surface of the widened portion 1a so that the groove 6c of the base 6a of the partition 6 faces the flat tube 1. Then, even if the partition portion 6b tries to deform due to residual strain, the deformation is suppressed by the expanding portion 1a that comes into contact.

Next, FIGS. 11 to 13 show a second embodiment of the present invention, and this example is different from the first embodiment in the arrangement direction of the partitions 6.
In the first embodiment, the partition 6 is arranged in parallel to the stacking direction of the flat tubes 1 constituting the core 2. However, in the second embodiment, the partition 6 is arranged in a direction orthogonal to the stacking direction of the flat tubes 1.
In this example, an inner fin 12 is arranged in each flat tube 1. The inner fin 12 is formed by bending a metal plate into a corrugated shape, and the inner fin 12 is formed such that a side wall of each wave is linearly continuous in the flow direction of the internal fluid of the flat tube 1.
Therefore, each wave of the inner fin 12 divides the inside of the flat tube 1 into a number of flow paths.

  The partition 6 has a base portion 6a and a partition portion 6b perpendicular to the base portion 6a, and a large number of tongue pieces 8 are juxtaposed through the slit 7 in the partition portion 6b. The shape of the tongue piece 8 matches the cross section of the opening of the flat tube 1. The width of the slit 7 is formed to be twice as large as the plate thickness of each flat tube 1 or slightly larger than that, and each slit 7 is fitted to the expanded portion 1 a of each flat tube 1. And the partition 6 bisects the width direction of each flat tube 1 as shown in FIG.12 and FIG.13. Then, the base 6 a of the partition 6 is joined to the inner surface of the header 4. A pair of inlet / outlet pipes 14 communicates with the header 4. Preferably, the tip of each tongue piece 8 is joined to the inner fin 12.

[Action]
In the first embodiment of FIG. 1, as an example, the first fluid 15 flows in from the lower side of the bridging portion 4a of the header 4 and flows through the flat tubes 1 in the lower half of the core 2 to form a U-turn tank. 5 makes a U-turn, moves inside each flat tube 1 in the upper half to the header 4 side, and is guided to the outside. Then, the second fluid 16 flows in from the one inlet / outlet pipe 13 of the casing 3, flows through the gaps between the flat tubes 1, and flows out from the other inlet / outlet pipe 13. Heat exchange is performed between the first fluid 15 and the second fluid 16.

  Next, in the second embodiment of FIG. 11, the first fluid 15 flows in from one inlet / outlet pipe 14, and the first fluid 15 flows through the right half of each flat tube 1 in the U-turn tank 5. It moves to the left half side and flows out from the other inlet / outlet pipe 14. And the 2nd fluid 16 distribute | circulates the clearance gap between each flat tube 1 from one entrance / exit pipe 13, and it flows out from the other entrance / exit pipe 13. FIG.

Next, FIGS. 14 and 15 are modifications of the embodiment shown in FIGS.
2 and 3 is different from the example of FIGS. 2 and 3 in that the partition 6 is formed in a flat plate shape as a whole, and convex portions 6d are protruded by the plate thickness of the header 4 on both sides of the rear end. 4 is that slits 4c are formed on both side walls of 4 so as to align with the convex portion 6d. The leading end of the partition 6 is brought into contact with the bridging portion 4a, and the projection 6d is fitted into the slit 4c and the two are integrally brazed and fixed.
The rear end of the partition 6 is joined to the expanded portion 1a of the flat tube 1 in the same manner as in the examples of FIGS.

  Next, FIGS. 16 and 17 are modifications of FIG. This example differs from the example of FIG. 5 in the shape of the tip of the partition and the brazing structure. The front end portion plane of the partition 6 is bent in a cross-sectional shape, the side plane intersects the plane of the expanded portion 1a of the flat tube 1 and makes a linear contact, and the contact portion and the The vicinity is integrally fixed by brazing. This is a header plateless heat exchanger. The brazing part of the partition is linear, preventing fluid leakage and reducing the change in the temperature distribution of the connection part. Is to prevent separation.

  Next, FIGS. 18, 19 and 20 are further modified examples of FIG. In this example, instead of a flat tube, a pair of bar members are stacked in a cross-beam shape and applied to a stacked heat exchanger in which a flat plate 17 is interposed between the bar members. The tip shape of the partition and the brazing structure are the same as in the example of FIG. That is, the plane of the front end of the partition 6 is bent in a cross-sectional shape, the plane intersects the plane of the plate 17 and makes a linear contact, and the contact portion and the vicinity thereof are integrally formed. It is fixed. This also makes the brazing part of the partition linear so as to prevent fluid leakage and reduce the change in the temperature distribution of the connection part to prevent separation of the brazing part due to thermal strain.

1 Flat tube
1a Expanding part 2 Core 3 Casing
3a Casing body
3b Lid 4 Header
4a Bridge part
4b Holding part
4c slit

5 U-turn tank 6 Partition
6a base
6b Partition
6c Groove
6d Convex 7 Slit 8 Tongue

9 Flange
9a Outer periphery
9b Cross-linking part
12 Inner fin
13 Entrance / exit pipe
14 Entrance pipe
15 First fluid
16 Second fluid
17 plates
18-wire contact
19 waxy fillet
20 Bar material
21 Inclined surface

Claims (8)

A large number of plates (17) are stacked, a core (2) having a flat flow path is formed between a pair of plates facing each other, a header (4) is provided at one end of the core (2), and the other In a heat exchanger with a U-turn tank (5) connected to the end,
The inside of the header (4) is an intermediate portion in the stacking direction of each flat channel, and is divided into two by a partition (6), and the tip of the partition (6) is the tip of the plate (17) of the flat channel A heat exchanger characterized by being connected by brazing. The heat exchanger according to claim 1,
A heat exchanger in which a front end portion of the partition (6) is in line contact with a front end edge of the plate (17), and the plate (17) and the partition (6) are brazed at the line contact portion. Each of the plates (17) is formed in a groove shape, and a pair of opposing plates (17) are fitted together to form a flat tube (1), and the flat tube (1) is in the thickness direction at both ends thereof. It has an expanded part (1a) that is expanded,
A plurality of flat tubes (1) are laminated at the expanded portion (1a) to constitute the core (2), and the outer periphery of the core (2) is fitted with the casing (3), and the core (2) In a heat exchanger in which a header (4) is disposed at one end in the flow direction of the above, and each component is fixed by brazing.
A box-shaped U-turn tank (5) is connected to the other end of the core (2) in the flow direction,
The inside of the header (4) is divided by a partition (6) in the middle of the flat tube (1) in the stacking direction, and the tip of the partition (6) is an expanded portion of the flat tube (1) ( A header plateless heat exchanger connected to 1a). The heat exchanger according to claim 3,
The header (4) has a rectangular cylindrical portion whose inner circumference is aligned with the outer circumference of the core (2), and a bridging portion (4a) is provided at a central position on the inlet side, and the bridging portion (4a ) In the middle of the holding section (4b) having a U-shaped cross section,
The partition (6) has a base (6a) and a partition (6b) extending from the base (6a) to the core (2) side,
The base portion (6a) has a groove-shaped portion (6c) that is bent in a U-shaped cross section at the middle portion in the longitudinal direction, and the outer periphery of the groove-shaped portion (6c) is the holding portion (4b) of the header (4). ), The L-shaped crossing angle between the partition part (6b) and the base part (6a) is maintained as perpendicular as possible at the time of brazing. Header plateless heat exchanger. The heat exchanger according to claim 4,
With the groove (6c) of the partition (6) facing the opening of the flat tube (1), the partition (6b) is in contact with the inner surface of the widened portion (1a) of the flat tube (1). And a header plateless type heat exchanger in which the partition portion (6b) is prevented from being deformed when brazed by the contact. The heat exchanger according to claim 3,
A header plateless heat exchanger in which the thickness of the header (4) is larger than the thickness of the partition (6). It has a plurality of flat tubes (1) formed with widened portions (1a) that are widened in the thickness direction at both ends in the flow direction of the internal fluid, and each flat tube (1) has its widened portion ( 1a) is laminated to form the core (2), the outer periphery of the core (2) is fitted with the casing (3), and the header (4) is disposed at one end of the core (2) in the flow direction In a heat exchanger in which each component is fixed by brazing,
Inside each flat tube (1), an inner fin (12) bent into a waveform is inserted, and the inner fin (12) is formed such that the side wall of each wave is linearly continuous in the flow direction,
The opening of the box-shaped tank for U-turn (5) is connected to the other end in the flow direction of the core (2),
The inside of the header (4) is divided into two by a partition (6) orthogonal to the stacking direction of the flat tube (1), and a plurality of tongue pieces (8) are slits (at the tip of the partition (6)). 7) header plateless type heat exchange, wherein each tongue piece (8) is inserted into the widened portion (1a) of each flat tube (1), being spaced apart from each other via 7) vessel. The heat exchanger according to claim 7,
The plane of the tip of the partition (6) intersects the plane of the expanded portion (1a) of the flat tube (1) and makes a linear contact, and the contact portion and its vicinity are integrally brazed. A header plateless type heat exchanger characterized by being fixed.

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