JP2023152615A - Heat exchanger and its manufacturing method - Google Patents

Abstract

To provide a heat exchanger which can suppress a flow of the other fluid from being hindered in the vicinity of an entrance/exit of a flow passage, and its manufacturing method.SOLUTION: A radiator 1 comprises a core part 3, and a refrigerant flow passage 5a and an air flow passage 7 which are arranged at the core part. Cooling water flowing in the refrigerant flow passage 5 and air flowing in the air flow passage 7 perform a heat exchange via a bulkhead 54. The refrigerant flow passage 5 comprises a plurality of main flow passages 51 located so as to be aligned in a prescribe direction, an introduction chamber 52 communicating with the plurality of main flow passages 51, and extending in the prescribed direction, and a discharge chamber 53 communicating with the plurality of main flow passages 51, and extending in the prescribed direction. Each of the main flow passages 51 has an introduction-side shape change zone 55 in which the shape of a prescribed flow passage cross section gradually changes toward the introduction chamber 52 and is linearly connected to the adjacent main flow passage 51, and a discharge-side shape change zone 56 in which the shape of a prescribed flow passage cross section gradually changes toward the discharge chamber 53 and is linearly connected to the adjacent main flow passage 51.SELECTED DRAWING: Figure 8

Description

The present invention relates to a heat exchanger and a method for manufacturing the same.

Conventionally, heat exchangers using various heat transfer methods have been widely used as devices for transferring heat between two fluids having different temperatures.

In recent years, research and development efforts have been actively conducted to improve energy efficiency in order to ensure that more people have access to affordable, reliable, sustainable, and advanced energy. Heat exchangers are required to improve their heat exchange efficiency in order to contribute to energy efficiency.

For example, Patent Document 1 describes a plurality of tubular flow paths including a plurality of first flow paths through which a first fluid flows and a plurality of second flow paths through which a second fluid that exchanges heat with the first fluid flows. A heat exchanger is described in which the position and external shape in a cross section orthogonal to each predetermined direction (extending direction of the flow channel) change depending on the position in the predetermined direction. There is.

JP2020-46161A

However, when the shape of the flow path is changed in a complicated manner in the heat exchanger, as in the heat exchanger described in Patent Document 1, the pressure loss of the fluid may increase. The obstruction of fluid flow may be a factor in reducing heat exchange efficiency. On the other hand, it is necessary to avoid interfering with the flow of other fluids near the entrances and exits to the flow path.

The present invention provides a heat exchanger that can suppress the flow of other fluids near the entrance and exit of a flow path while suppressing an increase in pressure loss, and a method for manufacturing the heat exchanger.

The present invention
The core part and
a first flow path provided in the core portion, through which a first fluid flows;
a second flow path provided in the core portion, through which a second fluid flows;
In the core part, the first fluid flowing through the first flow path and the second fluid flowing through the second flow path exchange heat through a partition wall, the heat exchanger comprising:
The first flow path and the second flow path are regularly arranged tubular flow paths,
The first flow path is
a plurality of main channels extending in a first direction and located side by side in a second direction;
an introduction chamber communicating with the plurality of main channels and extending in the second direction;
a discharge chamber communicating with the plurality of main channels and extending in the second direction,
The main flow path is
an introduction-side shape-changing section in which the shape of a predetermined cross-section of the flow path gradually changes toward the introduction chamber and is linearly connected to the adjacent main flow path;
The discharge side shape changing section includes a shape change section on the discharge side in which the shape of the predetermined cross section of the flow path gradually changes toward the discharge chamber and is linearly connected to the adjacent main flow path.

Moreover, the present invention
The core part and
a first flow path provided in the core portion, through which a first fluid flows;
a second flow path provided in the core portion, through which a second fluid flows;
In the core part, the first fluid flowing through the first flow path and the second fluid flowing through the second flow path exchange heat through a partition, the method comprising:
The first flow path and the second flow path are regularly arranged tubular flow paths,
The first flow path is
a plurality of main channels extending in a first direction and having a predetermined channel cross section;
an introduction chamber that extends in the second direction and communicates with the plurality of main flow channels arranged in the second direction among the plurality of main flow channels;
a discharge chamber extending in the second direction and communicating with the plurality of main flow channels arranged in the second direction among the plurality of main flow channels;
The main flow path is
an introduction-side shape-changing section in which the shape of a predetermined cross-section of the flow path gradually changes toward the introduction chamber and is linearly connected to the adjacent main flow path;
a discharge side shape changing section in which the shape of the predetermined flow path cross section gradually changes toward the discharge chamber and is linearly connected to the adjacent main flow path;
The manufacturing method includes a step of integrally molding the core portion by layered manufacturing.

According to the present invention, since the shape of the flow path cross section gradually changes in the inlet side shape change section and the discharge side shape change section, it is possible to suppress an increase in pressure loss, and the flow of one fluid is reduced near the inlet/outlet of the other fluid. It is possible to suppress interference.

1 is a perspective view of a radiator 1. FIG. FIG. 2 is a partial perspective view exposing a cross section taken along line AA in FIG. 1; (A) is a partial cross-sectional view of a part of the cross section taken along line BB in FIG. 1, and (B) is a view showing the twisted ribbon 15. 3 is a diagram of area D in FIG. 2 viewed from direction C. FIG. FIG. 5 is a partially enlarged view of a cross-sectional perspective view of area D in FIG. 4 at a vertical position H1. 5 is a partially enlarged view of a cross-sectional perspective view at a vertical position H2 of region D in FIG. 4. FIG. 5 is a partially enlarged view of a cross-sectional perspective view at a vertical position H3 of region D in FIG. 4. FIG. 5 is a diagram summarizing cross-sectional perspective views at vertical positions H1, H2, and H3 of region D in FIG. 4. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the heat exchanger of this invention is described based on an accompanying drawing. Note that the drawings should be viewed in the direction of the symbols. A heat exchanger is a device that allows a first fluid to be cooled and a second fluid that cools the first fluid to exchange heat via a partition wall. The properties of the first fluid and the second fluid are not particularly limited, and include all combinations such as gases together, liquids together, and gases and liquids. The first fluid and the second fluid are, for example, water, oil, organic medium, air, or helium gas. Moreover, the equipment in which the heat exchanger is mounted is not particularly limited, and includes all kinds of products such as vehicles, general-purpose equipment, aircraft, and home appliances. In the following embodiments, a radiator mounted on a vehicle will be described as an example of the heat exchanger of the present invention. That is, in the following embodiments, the first fluid is cooling water that cools the drive source of the vehicle, and the second fluid is air (driving wind).

FIG. 1 is a perspective view of a radiator 1 according to an embodiment of the present invention. FIG. 2 is a partial perspective view of the radiator 1 shown in FIG. 1, with a cross section taken along line AA in FIG. 1 exposed. FIG. 3A is a partial cross-sectional view of a portion of the cross section taken along line BB in FIG. In this specification, in order to simplify and clarify the explanation, the radiator 1 will be explained using an orthogonal coordinate system in three directions: the front-rear direction, the left-right direction, and the up-down direction, as shown in FIG. However, it should be noted that this direction has nothing to do with the direction in which the radiator 1 is mounted on the device. In the figure, the upper side is written as U, the lower side as D, the left side as L, the right side as R, the front as Fr, and the rear as Rr.

The radiator 1 includes a core portion 3, a refrigerant flow path 5 provided in the core portion 3 through which cooling water flows, and an air flow path 7 provided in the core portion 3 through which air flows. In the radiator 1, in the core portion 3, cooling water flowing through the refrigerant flow path 5 and air flowing through the air flow path 7 exchange heat via a partition wall 54, which will be described later. Therefore, the conventional plate type uses a flat plate to separate the fluid (heat transfer fins may be added), and the fin-tube type uses flat plate fins around a circular tube to exchange heat through heat conduction. It is different from what you do. The core part 3 is provided with an introduction pipe 11 at the upper part of the rear surface, and an exhaust pipe 13 at the lower part of the front surface. The introduction pipe 11 and the discharge pipe 13 communicate with the refrigerant flow path 5 of the core section 3 .

As shown by arrow P, the cooling water is introduced into the core part 3 from the outside via the introduction pipe 11 provided in the core part 3, and after flowing through the refrigerant channel 5 in the core part 3 from above to below. , are discharged to the outside via a discharge pipe 13 provided in the core portion 3. On the other hand, as shown by the arrow Q, air is introduced into the core part 3 from the bottom surface of the core part 3, flows from the bottom to the top through the air flow path 7 in the core part 3, and then is discharged from the top surface of the core part 3. be done. The refrigerant flow path 5 and the air flow path 7 are regularly arranged tubular flow paths. Here, the tubular flow path refers to a pipe-like flow path having a closed cross-sectional shape of a circular arc or a polygon.

As shown in FIG. 2, the refrigerant channel 5 extends in the vertical direction and communicates with a plurality of main channels 51 arranged in the front-rear direction and a plurality of main channels 51 arranged in the front-rear direction. It includes an introduction chamber 52 that extends in the front-rear direction, and a discharge chamber 53 that extends in the front-rear direction and communicates with a plurality of main channels 51 arranged in the front-rear direction. The refrigerant flow path 5 includes a plurality of main flow paths 51 arranged in the front-rear direction, an introduction chamber 52 and a discharge chamber 53 that communicate with the main flow path 51, and a plurality of such sets are provided in the left-right direction. It will be done. Therefore, as shown in FIG. 3A, the main channels 51 are regularly arranged in a grid pattern in the vertical cross section.

In the present embodiment shown in FIG. 3A, the main flow path 51 has a cross-shaped flow path cross section in which a space extending in the front-rear direction and a space extending in the left-right direction intersect in a cross shape. Note that the shape of the main flow path 51 is not limited to this, and may be any shape such as a square, rectangle, diamond, trapezoid, circle, ellipse, star, triangle, polygon of pentagon or more, and other geometric patterns. .

The introduction chamber 52 communicates with the introduction pipe 11 and the discharge chamber 53 communicates with the discharge pipe 13.

As shown in FIG. 2, the main flow path 51 has an introduction side shape changing section 55 at the upper end where the cross-sectional shape of the flow path gradually changes toward the introduction chamber 52 and is linearly connected to the adjacent main flow path 51. A discharge side shape changing section 56 is provided at the lower end, and the shape of the cross section of the flow passage gradually changes toward the discharge chamber 53 and is linearly connected to the adjacent main flow passage 51. The introduction side shape change section 55 and the discharge side shape change section 56 will be described later.

As shown in FIG. 3A, the air flow path 7 has a plurality of flow paths 7a formed by being surrounded by partition walls 54 that partition the main flow path 51. The flow paths 7a to 7d, 7A to 7D (hereinafter referred to as 7a only when the flow paths are not distinguished) extend in the vertical direction, are surrounded by the main flow path 51 of the refrigerant flow path 5, and are There are multiple directions. The partition wall 54 may be composed only of straight lines, may include curved lines, or may be composed only of curved lines. Further, the main flow path 51 of the refrigerant flow path 5 and the flow path 7a of the air flow path 7 do not necessarily have to be adjacent to each other with the partition wall 54 in between. May include. The flow path 7a communicates with the outside from the upper surface of the core portion 3 and communicates with the outside from the lower surface of the core portion 3. As a result, air is introduced into the core part 3 from the lower surface of the core part 3, as shown by the arrow Q in FIG. is discharged from the top.

Furthermore, a twisted ribbon 15 shown in FIG. 3(A) is integrally provided inside the flow path 7a. As shown in FIG. 3B, the torsion ribbon 15 is configured to twist a thin plate to one side in the circumferential direction around an axis extending in the vertical direction, and controls the flow of air flowing inside the flow path 7a. Stirring improves the heat exchange rate.

Further, as shown in FIG. 3A, the torsion ribbon 15 has different torsion phases in the air channels 7A, 7B, 7C, and 7D arranged in the left-right direction, and the air channels arranged in the front-rear direction have different twist phases. They are provided so that the torsional phases are the same. Note that the twist phase can be set as appropriate.

The introduction side shape changing section 55 provided at the upper end of the main channel 51 of the refrigerant channel 5 will be described in detail below with reference to FIGS. 4 to 7. The discharge side shape change section 56 provided at the lower end of the main flow path 51 of the refrigerant flow path 5 has the same structure as the introduction side shape change section 55, so a detailed description thereof will be omitted.

The shape changing section 55 on the introduction side of the main flow path 51 gradually changes the shape of the cross section toward the introduction chamber 52 and is linearly connected to the adjacent main flow path 51 .

FIG. 4 is a diagram of area D in FIG. 2 viewed from direction C. Region D is a region corresponding to the upper ends of the refrigerant flow path 5 and the air flow path 7. Moreover, FIG. 5 shows a partially enlarged view of the cross-sectional perspective view at the vertical position H1 in FIG. Similarly, FIG. 6 shows a partially enlarged view of the cross-sectional perspective view at the vertical position H2 in FIG. 4, and FIG. 7 shows a partially enlarged view of the cross-sectional perspective view at the vertical position H3 in FIG. , FIG. 8 is a diagram summarizing cross-sectional perspective views at vertical positions H1, H2, and H3 of area D in FIG. 4. Note that the twisted ribbon 15 is omitted in FIGS. 5 to 8.

The partially enlarged view H1 shown in FIG. 5 shows an enlarged view at the lowest vertical position H1 among the three enlarged views, and is the starting point of the introduction side shape change section 55. At the vertical position H1, the refrigerant flow path 5 has the shape shown in FIG. 3(A). That is, the main flow path 51 of the coolant flow path 5 has a cross-shaped flow path cross section. It is independent from the main channels 51 that are adjacent to each other in the front-rear direction and the left-right direction.

The partially enlarged view H2 shown in FIG. 6 shows an enlarged view at an intermediate position H2 in the vertical direction among the three enlarged views, and is the intermediate part of the introduction side shape change section 55. The cross-section of the flow path at the vertical position H2 is such that the length of the flow path extending in the front-rear direction becomes longer as it goes toward the introduction chamber 52 (upper side) from the cross-shaped flow path cross-section at the vertical position H1 (FIG. 5). As the width increases, the length of the channel extending in the left and right direction becomes shorter and the width becomes narrower. Then, a communication path S is gradually provided between the main channels 51 that are adjacent to each other in the front-rear direction. In the cross-section of the flow path at the vertical position H2, the length of the flow path extending in the front-rear direction increases and the width increases as the flow path extends further toward the introduction chamber 52 (upper side), and the length of the flow path extending in the left-right direction increases. As the length becomes shorter, the width becomes narrower.

Here, the cross-sectional area of the flow path cross section of the main flow path 51 is the same in the introduction side shape change section 55. That is, although the shape of the flow path cross section gradually changes in the introduction side shape changing section 55, the cross sectional area of the flow path cross section does not change. Therefore, the cooling water can flow more smoothly, and the occurrence of pressure loss is suppressed.

The partially enlarged view H3 shown in FIG. 7 shows an enlarged view at the uppermost vertical position H3 among the three enlarged views, and is the end point of the introduction side shape change section 55. The cross section of the flow path at the vertical position H3 is connected to the adjacent main flow path 51 and forms a straight line in the front-rear direction. That is, the communication path S becomes indistinguishable from the flow path extending in the front-rear direction, and the flow path extending in the left-right direction disappears. The linear flow path shown in FIG. 7 communicates with an introduction chamber 52 located further above.

In this way, the cross section of the main flow path 51 gradually changes due to the introduction side shape changing section 55, and the main flow path 51 is linearly connected to the adjacent main flow path 51 and communicated with the introduction chamber 52, thereby creating a gap between the main flow paths 51. This does not impede the flow of air passing through the flow path 7a of the air flow path 7 that is formed. Therefore, the flow of air is not obstructed near the entrance of the main flow path 51.

Although a detailed explanation will be omitted, similarly, the shape change section 56 on the discharge side of the main flow path 51 gradually changes the cross-sectional shape of the flow channel toward the discharge chamber 53 and is linearly connected to the adjacent main flow path 51. . Therefore, the cross section of the main flow path 51 gradually changes due to the discharge side shape changing section 56, and the main flow path 51 is linearly connected to the adjacent main flow path 51 and communicated with the discharge chamber 53, thereby forming a cross section between the main flow paths 51. The flow of air passing through the flow path 7a of the air flow path 7 is not obstructed. Therefore, the flow of air is not obstructed near the outlet of the main flow path 51. Air flowing into the flow path 7a of the air flow path 7 from the gap in the introduction chamber 52 is agitated by flowing through the flow path 7a while being guided by the twisted ribbon 15, and is discharged to the outside from the gap in the discharge chamber 53.

In addition, by changing only the shape of the flow path in the inlet-side shape change section 55 and the discharge-side shape change section 56 while maintaining the same cross-sectional area of the flow path, an increase in the pressure drop of the cooling water is also avoided.

In addition, the radiator 1 of this embodiment uses additive manufacturing technology (hereinafter referred to as AM technology) in which the core portion 3 can manufacture parts with three-dimensional complex shapes by laminating and solidifying predetermined powder materials layer by layer. ) is preferably manufactured. This makes it possible to manufacture parts with minute and complex three-dimensional shapes that are difficult to manufacture using conventional manufacturing methods such as machining and casting. Moreover, the radiator 1 can be downsized.

Furthermore, not only the core part 3 but also the introduction pipe 11 and the discharge pipe 13 can be manufactured integrally with the core part 3 using AM technology. If the core part 3, the introduction pipe 11, and the discharge pipe 13 were manufactured separately, a process of assembling the introduction pipe and the discharge pipe to the core part 3 would be required, but by manufacturing them in one piece using AM technology. , this step is omitted. Note that the predetermined powder material may be resin or metal.

Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to this embodiment. It is clear that those skilled in the art can come up with various changes or modifications within the scope of the claims, and these naturally fall within the technical scope of the present invention. Understood. Further, each component in the above embodiments may be arbitrarily combined without departing from the spirit of the invention.

For example, in the above embodiment, the radiator 1 has a box-shaped core portion 3, but the core portion 3 may have a complicated shape that is three-dimensionally curved by AM technology.

This specification describes at least the following matters. In parentheses, corresponding components in the above-described embodiment are shown as an example, but the present invention is not limited thereto.

(1) A core part (core part 3),
a first channel (refrigerant channel 5) provided in the core portion and through which a first fluid (cooling water) flows;
a second flow path (air flow path 7) provided in the core portion and through which a second fluid (air) flows;
In the core part, a heat exchanger (radiator 1) in which the first fluid flowing through the first flow path and the second fluid flowing through the second flow path exchange heat via a partition wall (partition wall 54). There it is,
The first flow path and the second flow path are regularly arranged tubular flow paths,
The first flow path is
A plurality of main channels (main channels 51) extending in a first direction (vertical direction) and arranged in a row in a second direction (front-back direction);
an introduction chamber (introduction chamber 52) communicating with the plurality of main channels and extending in the second direction;
a discharge chamber (discharge chamber 53) communicating with the plurality of main channels and extending in the second direction;
The main flow path is
an introduction side shape changing section (introduction side shape changing section 55) that gradually changes the shape of a predetermined flow path cross section toward the introduction chamber and is linearly connected to the adjacent main flow path;
a discharge side shape changing section (discharge side shape changing section 56) that gradually changes the shape of the predetermined flow path cross section toward the discharge chamber and is linearly connected to the adjacent main flow path; Heat exchanger.

According to (1), the flow cross section of the main flow channel gradually changes due to the shape change section and is connected to the adjacent main flow channel in a straight line, so the flow of the second fluid is obstructed near the entrance and exit of the main flow channel. Never.

(2) The heat exchanger according to (1),
The introduction side shape changing section and the introduction side shape changing section are heat exchangers in which the shape of the flow path cross section is changed while maintaining the cross sectional area of the flow path.

According to (2), the fluid can flow more smoothly.

(3) The heat exchanger according to (1) or (2),
A heat exchanger, wherein the predetermined flow path cross section has a cross shape.

According to (3), the contact area with the second fluid can be increased.

(4) The heat exchanger described in (1) to (3),
The first flow path is
A plurality of the plurality of main channels, the introduction chambers, and the discharge chambers are provided in a third direction (horizontal direction) orthogonal to the first direction and the second direction,
The second flow path is a heat exchanger having a plurality of flow paths formed by being surrounded by the partition walls that constitute the plurality of main flow paths.

According to (4), the heat exchanger can be downsized by forming the second flow path by being surrounded by the partition walls that constitute the plurality of main flow paths.

(5) The heat exchanger according to (4),
A heat exchanger including a region where the second flow paths are adjacent to each other with the partition wall in between.

According to (5), the degree of freedom in forming the flow path is improved.

(6) The heat exchanger described in (1) to (5),
A heat exchanger in which a twisted ribbon (twisted ribbon 15) is provided in the second flow path.

According to (6), the heat exchange rate is improved by stirring the flow of the second fluid.

(7) The heat exchanger according to any one of (1) to (6),
A heat exchanger in which the core portion is integrally formed by additive manufacturing.

According to (7), it is possible to manufacture fine and complex three-dimensional parts that are difficult to manufacture using conventional manufacturing methods such as machining and casting.

(8) The heat exchanger according to (7),
an introduction pipe (introduction pipe 11) communicating with the introduction chamber;
An exhaust pipe (exhaust pipe 13) communicating with the exhaust chamber,
The heat exchanger, wherein the core portion, the introduction pipe, and the discharge pipe are integrally formed by additive manufacturing.

According to (8), the step of assembling the introduction pipe and the discharge pipe to the core part can be omitted.

(9) a core part (core part 3);
a first channel (refrigerant channel 5) provided in the core portion and through which a first fluid (cooling water) flows;
a second flow path (air flow path 7) provided in the core portion and through which a second fluid (air) flows;
In the core part, the first fluid flowing through the first flow path and the second fluid flowing through the second flow path exchange heat through a partition wall. hand,
The first flow path and the second flow path are regularly arranged tubular flow paths,
The first flow path is
a plurality of main channels (cross channels) extending in a first direction and having a predetermined channel cross section;
an introduction chamber (introduction chamber 52) that extends in the second direction and communicates with the plurality of main flow channels arranged in the second direction among the plurality of main flow channels;
a discharge chamber (discharge chamber 53) extending in the second direction and communicating with the plurality of main flow channels arranged in the second direction among the plurality of main flow channels;
The main flow path is
an introduction side shape changing section (introduction side shape changing section 55) that gradually changes the shape of a predetermined flow path cross section toward the introduction chamber and is linearly connected to the adjacent main flow path;
a discharge side shape changing section (discharge side shape changing section 56) in which the shape of the predetermined flow path cross section gradually changes toward the discharge chamber and is linearly connected to the adjacent main flow path; ,
The manufacturing method of a heat exchanger includes a step of integrally molding the core portion by layered manufacturing.

According to (9), it is possible to manufacture parts with minute and complicated three-dimensional shapes that are difficult to manufacture using conventional manufacturing methods such as machining and casting. In addition, in the heat exchanger manufactured by this manufacturing method, the cross section of the main flow path gradually changes due to the shape change section and becomes an introduction chamber or a discharge chamber, so that the second fluid flows near the entrance and exit of the main flow path. is not hindered.

(10) A method for manufacturing the heat exchanger according to (9), comprising:
The heat exchanger is
an introduction pipe (introduction pipe 11) communicating with the introduction chamber;
An exhaust pipe (exhaust pipe 13) communicating with the exhaust chamber,
The manufacturing method of a heat exchanger includes a step of integrally molding the core part, the introduction pipe, and the discharge pipe by laminated manufacturing.

According to (10), the step of assembling the introduction pipe and the discharge pipe to the core part can be omitted.

1 Radiator (heat exchanger)
3 Core part 5 Refrigerant flow path (first flow path)
7 Air flow path (second flow path)
11 Introduction pipe 13 Discharge pipe 15 Twisted ribbon 51 Main channel 52 Introduction chamber 53 Discharge chamber 54 Partition wall 55 Introduction side shape change section 56 Discharge side shape change section

Claims (10)

The core part and
a first flow path provided in the core portion, through which a first fluid flows;
a second flow path provided in the core portion, through which a second fluid flows;
In the core part, the first fluid flowing through the first flow path and the second fluid flowing through the second flow path exchange heat through a partition wall, the heat exchanger comprising:
The first flow path and the second flow path are regularly arranged tubular flow paths,
The first flow path is
a plurality of main channels extending in a first direction and located side by side in a second direction;
an introduction chamber communicating with the plurality of main channels and extending in the second direction;
a discharge chamber communicating with the plurality of main channels and extending in the second direction,
The main flow path is
an introduction-side shape-changing section in which the shape of a predetermined cross-section of the flow path gradually changes toward the introduction chamber and is linearly connected to the adjacent main flow path;
A heat exchanger comprising: a discharge side shape changing section in which the shape of the predetermined cross section of the flow path gradually changes toward the discharge chamber and is linearly connected to the adjacent main flow path. The heat exchanger according to claim 1,
The introduction side shape changing section and the introduction side shape changing section are heat exchangers in which the shape of the flow path cross section is changed while maintaining the cross sectional area of the flow path. The heat exchanger according to claim 1,
A heat exchanger, wherein the predetermined flow path cross section has a cross shape. The heat exchanger according to claim 1,
The first flow path is
A plurality of the plurality of main channels, the introduction chamber, and the discharge chamber are provided in a third direction orthogonal to the first direction and the second direction,
The second flow path is a heat exchanger having a plurality of flow paths formed by being surrounded by the partition walls that constitute the plurality of main flow paths. The heat exchanger according to claim 4,
A heat exchanger including a region where the second flow paths are adjacent to each other with the partition wall in between. The heat exchanger according to claim 1,
The heat exchanger, wherein the second flow path is provided with a twisted ribbon. The heat exchanger according to any one of claims 1 to 6,
A heat exchanger in which the core portion is integrally formed by additive manufacturing. The heat exchanger according to claim 7,
an introduction pipe communicating with the introduction chamber;
an exhaust pipe communicating with the exhaust chamber,
The heat exchanger, wherein the core portion, the introduction pipe, and the discharge pipe are integrally formed by additive manufacturing. The core part and
a first flow path provided in the core portion, through which a first fluid flows;
a second flow path provided in the core portion, through which a second fluid flows;
In the core part, the first fluid flowing through the first flow path and the second fluid flowing through the second flow path exchange heat through a partition, the method comprising:
The first flow path and the second flow path are regularly arranged tubular flow paths,
The first flow path is
a plurality of main channels extending in a first direction and having a predetermined channel cross section;
an introduction chamber that extends in the second direction and communicates with the plurality of main flow channels arranged in the second direction among the plurality of main flow channels;
a discharge chamber extending in the second direction and communicating with the plurality of main flow channels arranged in the second direction among the plurality of main flow channels;
The main flow path is
an introduction-side shape-changing section in which the shape of a predetermined cross-section of the flow path gradually changes toward the introduction chamber and is linearly connected to the adjacent main flow path;
a discharge side shape changing section in which the shape of the predetermined flow path cross section gradually changes toward the discharge chamber and is linearly connected to the adjacent main flow path;
The manufacturing method of a heat exchanger includes a step of integrally molding the core portion by layered manufacturing. A method for manufacturing a heat exchanger according to claim 9, comprising:
The heat exchanger is
an introduction pipe communicating with the introduction chamber;
an exhaust pipe communicating with the exhaust chamber,
The manufacturing method of a heat exchanger includes a step of integrally molding the core part, the introduction pipe, and the discharge pipe by laminated manufacturing.

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