JP2021134986A - Heat exchange core and manufacturing method for heat exchange core - Google Patents

Abstract

To provide a heat exchange core that can reduce manufacturing costs by shortening forming time.SOLUTION: A heat exchange core comprises a plurality of internal flow passages, and a header flow passage communicating with the plurality of internal flow passages. An inner wall of the header flow passage has larger surface roughness than that of flow passage walls of the internal flow passages.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a heat exchange core and a method for manufacturing the heat exchange core.

Patent Document 1 includes a heat exchanger including several plates arranged parallel to each other and spacers extending between the plates and arranged parallel to each other so as to define a primary channel and a secondary channel. Is disclosed. It is also disclosed that such heat exchangers include coarse primary channels.

Special Table 2018-511773

However, in the conventional configuration shown in Patent Document 1, the plates are brazed to each other by a well-known method, and do not contribute to shortening the manufacturing time (modeling time) of the heat exchanger (heat exchange core).

At least one embodiment of the present disclosure has been made in view of the above circumstances, and an object of the present invention is to provide a heat exchange core and a method for manufacturing a heat exchange core, which can reduce the manufacturing cost by shortening the molding time. ..

In order to achieve the above object, the heat exchange core according to the present disclosure is
With multiple internal channels
A header flow path communicating with the plurality of internal flow paths and
With
The inner wall of the header flow path has a larger surface roughness than the flow path wall of the inner flow path.

Further, the method for manufacturing a heat exchange core according to the present disclosure is a method for manufacturing a heat exchange core including a plurality of internal flow paths extending in parallel with each other and a header flow path communicating with the plurality of internal flow paths. The header flow path is formed by performing laminating molding along the extending direction of the internal flow path to form the internal flow path and laminating modeling along the extending direction. Steps to do and
The inner wall of the header flow path has a surface roughness larger than that of the flow path wall of the inner flow path.

According to the heat exchange core of the present disclosure, when the heat exchange core is modeled by laminated modeling, the modeling time per unit volume of the portion provided with the header flow path can be made shorter than that of the portion provided with the internal flow path. Therefore, the molding time of the entire heat exchange core can be shortened, and the manufacturing cost of the heat exchange core can be reduced.

Further, according to the method for manufacturing a heat exchange core of the present disclosure, since the inner wall of the header flow path has a larger surface roughness than the flow path wall of the inner flow path, per unit volume in the step of forming the header flow path. The molding time can be made shorter than the portion where the internal flow path is provided. Therefore, the molding time of the entire heat exchange core can be shortened, and the manufacturing cost of the heat exchange core can be reduced.

It is a perspective view which shows typically the structure of the heat exchange core by at least one Embodiment of this disclosure. FIG. 2 is a cross-sectional view taken along the line II-II of the heat exchange core shown in FIG. FIG. 3 is a cross-sectional view taken along the line III-III of the heat exchange core shown in FIG. FIG. 2 is a sectional view taken along line IV-IV of the heat exchange core shown in FIG. FIG. 5 is a sectional view taken along line VV of the heat exchange core shown in FIG. It is a figure for demonstrating the manufacturing method of the heat exchange core by at least one Embodiment of this disclosure.

Hereinafter, a method for manufacturing the heat exchange core 1 and the heat exchange core 1 according to the embodiment of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. No.

[Rough configuration of heat exchange core 1]
The heat exchange core 1 according to the embodiment of the present disclosure is a component used alone or incorporated in a heat exchanger, and heat is supplied between the first fluid and the second fluid supplied to the heat exchange core 1. The exchange will take place. The first fluid and the second fluid supplied to the heat exchange core 1 may be liquid or gas, respectively, but usually the temperatures of the two are different.

As shown in FIG. 1, the heat exchange core 1 according to the embodiment of the present disclosure includes a main body portion 11 and a header portion 12. For example, the heat exchange core 1 can have a rectangular parallelepiped shape, but is not limited to this. For example, when the heat exchange core 1 has a rectangular parallelepiped shape, a main body 11 is provided on the body of the rectangular parallelepiped, and a pair of headers 12 are provided on one end (upper end) and the other end (lower end) of the rectangular parallelepiped. Be done. For example, a pair of header portions 12 provided at one end and the other end of the rectangular parallelepiped are located at four corners on the same plane of the rectangular parallelepiped.

For example, when the heat exchange core 1 has a rectangular parallelepiped shape, the header portion 12 can be provided on the outside of the rectangular parallelepiped, but the present invention is not limited to this. For example, when a pair of header portions 12 provided at one end and the other end of the rectangular parallelepiped are provided outside the rectangular parallelepiped, they are provided so as to project outward in the width direction of the rectangular parallelepiped. The header portions 121 and 122 provided at one end of the rectangular parallelepiped are the first header portion 121 and the second header portion 122, respectively, and the header portions 123 and 124 provided at the other end are the third header portions 123 and fourth, respectively. It becomes the header part 124.

The header section 12 is provided with a header flow path 3. As described above, for example, when the heat exchange core 1 has a rectangular parallelepiped shape and a pair of header portions 12 provided at one end and the other end of the rectangular parallelepiped are provided so as to project outward in the width direction of the rectangular parallelepiped, the rectangular parallelepiped. The header flow path 3 is provided in each of the pair of header portions 12 provided at one end portion and the other end portion of the above. The header flow path 31 provided in the first header section 121 becomes the first header flow path 31, and the header flow path 32 provided in the second header section 122 becomes the second header flow path 32. Further, the header flow path 33 provided in the third header section 123 becomes the third header flow path 33, and the header flow path 34 provided in the fourth header section 124 becomes the fourth header flow path 34.

Then, in the heat exchange core 1 in which the first fluid and the second fluid flow in the directions facing each other (hereinafter referred to as "countercurrent heat exchange core 1"), the first header flow path 31 sends the first fluid to the main body 11. It serves as a flow path for supplying, and the second header flow path 32 serves as a flow path for discharging the second fluid from the main body 11. Further, the third header flow path 33 serves as a flow path for discharging the first fluid from the main body portion 11, and the fourth header flow path 34 serves as a flow path for supplying the second fluid to the main body portion 11. In the heat exchange core 1 in which the first fluid and the second fluid flow in the same direction (hereinafter referred to as "parallel flow heat exchange core 1"), the second header flow path 32 supplies the second fluid to the main body 11. The fourth header flow path 34 serves as a flow path for discharging the second fluid from the main body 11.

As shown in FIG. 2, the heat exchange core 1 according to the embodiment of the present disclosure has a plurality of internal flow paths 2 in the main body 11. The plurality of internal flow paths 2 are flow paths extending in parallel with each other, and the plurality of internal flow paths 2 form the header flow described above at the ends of the internal flow paths 2 in the extending direction of the plurality of internal flow paths 2. Communicate with Road 3. For example, when the heat exchange core 1 has a rectangular parallelepiped shape, the plurality of internal flow paths 2 are provided along the longitudinal direction of the rectangular parallelepiped, and the header flow paths 3 described above are provided along the direction orthogonal to the longitudinal direction of the rectangular parallelepiped. .. Then, at one end and the other end of the internal flow path 2, the plurality of internal flow paths 2 communicate with the header flow path 3 described above.

As shown in FIG. 3, the plurality of internal flow paths 2 constitute a plurality of first flow paths 21 through which the first fluid flows and a plurality of second flow paths 22 through which the second fluid flows. Each of the plurality of first flow paths 21 and each of the plurality of second flow paths 22 are alternately arranged in the depth direction (Y direction in FIG. 3) in a cross section orthogonal to the longitudinal direction of the rectangular parallelepiped, and are adjacent to each other. The road 21 and the second flow path 22 are separated by a partition wall 23. The number of the plurality of first flow paths 21 and the plurality of second flow paths 22, that is, the number of partition walls 23 is not limited to the number shown in FIG. 3, and may be any number.

For example, the plurality of first flow paths 21 and the plurality of second flow paths 22 are divided into a plurality of divided flow paths 211 and 221 respectively, but the present invention is not limited thereto. When the plurality of first flow paths 21 and the plurality of second flow paths 22 are partitioned into a plurality of divided flow paths 211 and 221 respectively, the plurality of first flow paths 21 and the plurality of second flow paths 22 are each plurality of. The divided flow paths 211 and 221 are arranged along the width direction (X direction in FIG. 3) in a cross section orthogonal to the rectangular parallelepiped, and the divided flow paths 211 (221) and the divided flow paths 211 (221) adjacent to each other are separated from each other. Separated by a wall 24. The number of divided flow paths 211 and 221 of the plurality of first flow paths 21 and the plurality of second flow paths 22, that is, the plurality of first flow paths 21 and the plurality of second flow paths 22 are provided, respectively. The number of partition walls 24 to be used is not limited to the number shown in FIG. 3, and can be any number.

FIG. 4 is a diagram showing an intermediate flow path 41 communicating the first header flow path 31 and the first flow path 21 as described later, and FIG. 5 is a diagram showing the first header flow path 31 as described later. It is a figure which shows the intermediate flow path 42 which does not communicate with a 2nd flow path 22.
As shown in FIGS. 4 and 5, when a plurality of first flow paths 21 and a plurality of second flow paths 22 are partitioned into a plurality of divided flow paths 211 and 221 respectively, a plurality of first flow paths 21 and a plurality of first flow paths 21 An intermediate flow path 4 is provided at one end and the other end of the second flow path 22 of the above.

As shown in FIG. 4, the intermediate flow path 41 (hereinafter referred to as “first intermediate flow path 41”) provided at one end (upper end) of the first flow path 21 is partitioned into the first flow path 21. It communicates with the plurality of divided flow paths 211 at one end (upper end) of the divided flow paths 211 in the extending direction of the plurality of divided flow paths 211 (the extending direction of the first flow path 21). The first intermediate flow path 41 opens at one end (upper end) of the first flow path 21, while being separated from the outside by an outer wall (upper wall) 116. As shown in FIG. 5, the intermediate flow path 42 (hereinafter referred to as “second intermediate flow path 42”) provided at one end (upper end) of the second flow path 22 is divided into the second flow path 22. It communicates with the plurality of divided flow paths 221 at one end (upper end) of the divided flow path 221 in the extending direction of the flow path 221 (extending direction of the second flow path 22). The second intermediate flow path 42 opens at one end (upper end) of the second flow path 22, while being separated from the outside by an outer wall (upper wall) 116. Although not shown, the intermediate flow path (hereinafter referred to as "third intermediate flow path") provided at the other end (lower end) of the first flow path 21 is a plurality of divided flows partitioned in the first flow path 21. The other end (lower end) of the divided flow path 211 in the extending direction of the road 211 (extending direction of the first flow path 21) communicates with the plurality of divided flow paths 211. The third intermediate flow path opens to the other end (lower end) of the first flow path 21, while being separated from the outside by an outer wall (bottom wall) 111. The intermediate flow path (hereinafter referred to as “fourth intermediate flow path”) provided at the other end (lower end) of the second flow path 22 is an extension of a plurality of divided flow paths 221 partitioned in the second flow path 22. The other end (lower end) of the divided flow path 221 in the existing direction (extending direction of the second flow path 22) communicates with the plurality of divided flow paths 221. The fourth intermediate flow path opens to the other end (lower end) of the second flow path 22, while being separated from the outside by an outer wall (bottom wall) 111.

As shown in FIG. 4, the first header flow path 31 is orthogonal to the extending direction of the first flow path 21 at one end (upper end) of the first flow path 21 in the extending direction of the first flow path 21. It extends in the direction of the above and communicates with the first flow path 21 via the first intermediate flow path 41. As shown in FIG. 5, the second header flow path 32 is orthogonal to the extending direction of the second flow path 22 at one end (upper end) of the second flow path 22 in the extending direction of the second flow path 22. It extends in the direction of the surface and communicates with the second flow path 22 via the second intermediate flow path 42. Although not shown, the third header flow path 33 is a direction orthogonal to the extending direction of the first flow path 21 at the other end (lower end) of the first flow path 21 in the extending direction of the first flow path 21. It extends to the first flow path 21 and communicates with the first flow path 21 via the third intermediate flow path. The fourth header flow path 34 extends in a direction orthogonal to the extending direction of the second flow path 22 at the other end (lower end) of the second flow path 22 in the extending direction of the second flow path 22. , Communicates with the second flow path 22 via the fourth intermediate flow path.

[Inner wall 3a of header flow path 3]
The inner wall 3a of the header flow path 3 has a surface roughness larger than that of the flow path wall 2a of the inner flow path 2. For example, when the first header flow path 31, the second header flow path 32, the third header flow path 33, and the fourth header flow path 34 are provided outside the rectangular parallelepiped, the first header flow path 31, the second header, and the like are provided. The inner walls 31a, 32a, 33a, 34a of the flow path 32, the third header flow path 33, and the fourth header flow path 34 have surfaces larger than the flow path walls 21a, 22a of the first flow path 21 and the second flow path 22. Has roughness.

For example, in the Japanese Industrial Standards (JIS), arithmetic average roughness (Ra), maximum height (Ry), ten-point average roughness (Rz), and average spacing of irregularities (Sm) are used as parameters representing surface roughness. , The definition and display of the average interval (S) and load length ratio (tp) of the local peaks are specified, and the surface roughness is the arithmetic mean value of each part randomly extracted from the surface of the object. It is said that there is.

According to the heat exchange core 1 having the inner wall 3a of the header flow path 3, the inner wall 3a of the header flow path 3 has a surface roughness larger than that of the flow path wall 2a of the inner flow path 2, and thus the surface roughness is larger than that of the flow path wall 2a of the inner flow path 2. When modeling the heat exchange core 1, the modeling time per unit volume of the portion where the header flow path 3 is provided can be made shorter than the portion where the internal flow path 2 is provided. Therefore, since the molding time of the heat exchange core 1 can be shortened as a whole, the manufacturing cost of the heat exchange core 1 can be reduced.

The plurality of internal flow paths 2 extend in parallel with each other, and the header flow path 3 includes a first region 3a1 and a second region 3a2. The first region 3a1 is an overhang region located on one side in the extending direction of the plurality of internal flow paths 2 and has a first surface roughness. The second region 3a2 is a non-overhang region located on the other side of the plurality of internal flow paths 2 and has a second surface roughness equal to or lower than the first surface roughness. The second surface roughness of the inner wall 3a of the header flow path 3 is larger than the surface roughness of the flow path wall 2a of the inner flow path 2.

According to the heat exchange core 1 having the header flow path 3 including the first region 3a1 and the second region 3a2, the second surface roughness of the second region (non-overhang region) 3a2 of the header flow path 3 is It is equal to or less than the first surface roughness of the first region (overhang region) 3a1, and the second region (non-overhang region) 3a2 of the header flow path 3 is larger than the surface roughness of the flow path wall 2a of the internal flow path 2.
Therefore,
The first surface roughness of the first region 3a1 ≧ the surface roughness of the second region 3a2> the surface roughness of the flow path wall of the internal flow path 2.
That is, the surface roughness of the second region (non-overhang region) 3a2 is equal to or less than the surface roughness of the first region (overhang region) 3a1, and the modeling time per unit area of the portion where the second region 3a2 is provided is internally included. It can be made shorter than the portion where the flow path 2 is provided. Therefore, since the molding time of the heat exchange core 1 can be shortened as a whole, the manufacturing cost of the heat exchange core 1 can be reduced.

[Arrangement of header flow path 3]
As shown in FIG. 4, the header flow path 3 is at least partially arranged within the formation range 2A of the plurality of internal flow paths 2 in the extending direction of the plurality of internal flow paths 2. For example, the first header flow path 31 is at least partially arranged in the formation range 2A of the first flow path 21 in the extending direction of the first flow path 21. As a result, the first header flow path 31 overlaps with the first flow path 21 in the extending direction of the first flow path 21. Although not shown, for example, the second header flow path 32 is at least partially arranged within the formation range 2A of the second flow path 22 in the extending direction of the second flow path 22. As a result, the second header flow path 32 overlaps with the second flow path 22 in the extending direction of the second flow path 22. For example, the third header flow path 33 is at least partially arranged in the formation range of the first flow path 21 in the extending direction of the first flow path 21. As a result, the third header flow path 33 overlaps with the first flow path 21 in the extending direction of the first flow path 21. For example, the fourth header flow path 34 is at least partially arranged within the formation range of the second flow path 22 in the extending direction of the second flow path 22. As a result, the fourth header flow path 34 overlaps with the second flow path 22 in the extending direction of the second flow path 22.

According to the heat exchange core 1 in which the header flow path 3 is arranged in this way, the header flow path 3 is arranged within the formation range 2A in the extension direction of the internal flow path 2, so that the extension direction of the internal flow path 2 is reached. The size of the heat exchange core 1 in the above can be suppressed, and the heat exchange core 1 can be made compact.

[Partition wall 4a between header flow path 3 and intermediate flow path 4]
As shown in FIG. 2, a partition wall 4a is provided between the header flow path 3 and the intermediate flow path through which the other fluid flows. The partition wall 4a separates different fluids. For example, a partition wall 42a for separating the second fluid is provided between the first header flow path 31 and the second intermediate flow path 42, and the second header flow path is provided. A partition wall 42b for separating the first fluid is provided between the 32 and the first intermediate flow path 41. Further, although not shown, for example, a partition wall for separating the second fluid is provided between the third header flow path 33 and the fourth intermediate flow path, and the fourth header flow path 34 and the third intermediate flow path are provided. A partition wall is provided between the two and the first fluid. The partition wall 4a between the header flow path 3 and the intermediate flow path 4 through which the other fluid flows is along the extending direction of the internal flow path 2 (see FIG. 5). For example, the partition wall 42a between the first header flow path 31 and the second intermediate flow path 42 through which the second fluid flows is along the extending direction of the second flow path 22. Further, for example, the partition wall 41a between the second header flow path 32 and the first intermediate flow path 41 through which the first fluid flows is along the extending direction of the first flow path 21. Although not shown, for example, the partition wall between the third header flow path 33 and the fourth intermediate flow path through which the second fluid flows is along the extending direction of the second flow path 22. Further, for example, the partition wall between the fourth header flow path 34 and the first flow path 21 through which the first fluid flows is along the extending direction of the first flow path 21.

As shown in FIG. 5, according to the heat exchange core 1 having the partition wall 4a along the extending direction of the internal flow path 2 in this way, the partition wall 4a that separates different fluids does not have an overhang shape, so that the partition wall can be thinned. .. Therefore, the header flow path 3 can be moved inward toward the internal flow path 2 arrangement region side, and the heat exchange core 1 can be made compact.

For example, in the example shown in FIG. 5, the partition wall 4a between the header flow path 3 and the intermediate flow path 4 is thinned so that the intermediate flow path 4 is brought closer to the header flow path 3. Further, although the intermediate flow path side of the partition wall 4a has a rectangular cross section when viewed from a direction orthogonal to the intermediate flow path 4, an inclined surface of, for example, 45 degrees may be provided which is inclined toward the intermediate flow path side.

[Curved surface of inner wall of header flow path 3]
As shown in FIGS. 4 and 5, the heat exchange core 1 includes an intermediate flow path 4 adjacent to the end of the internal flow path 2. The inner wall 3a of the header flow path 3 includes a curved surface 3a3 having an arc shape, and the partition wall 4a has a part of the curved surface 3a3 on the surface. The center of curvature 3a31 of the curved surface 3a3 is located within the formation range 4A of the intermediate flow path 4 in the extending direction of the internal flow path 2.

According to the heat exchange core 1 having the header flow path 3 of the curved surface of the inner wall, the tangential direction of the arc shape extends in the tangential direction of the inner flow path 2 in the inner wall 3a of the header flow path 3 having the curved surface 3a3 of the arc shape. It can be aligned in the existing direction, and the wall wall 4a can be thinned by a simple header flow path shape.

[Manufacturing method of heat exchange core 1]
The method for manufacturing the heat exchange core 1 according to the embodiment of the present disclosure is a heat exchange core 1 including a plurality of internal flow paths 2 extending in parallel with each other and a header flow path 3 communicating with the plurality of internal flow paths 2. It is a manufacturing method. The heat exchange core 1 is manufactured by laminating and modeling along the extending direction of the internal flow path 2 to form the internal flow path 2 and laminating along the extending direction of the internal flow path 2. A step of forming the header flow path 3 is provided. In this method of manufacturing the heat exchange core 1, the inner wall 4s of the header flow path 3 has a surface roughness larger than that of the flow path wall 2a of the inner flow path 2.

According to such a method of manufacturing the heat exchange core 1, the inner wall 3a of the header flow path 3 has a surface roughness larger than that of the flow path wall 2a of the inner flow path 2, and therefore, in the step of forming the header flow path 3. The molding time per unit volume can be made shorter than the portion where the internal flow path 2 is provided. Therefore, since the molding time of the entire heat exchange core 1 can be shortened, the manufacturing cost of the heat exchange core 1 can be reduced.

[Laminate modeling of internal flow path 2 and header flow path 3]
The laminated molding of the internal flow path 2 and the header flow path 3 includes a step of spreading the metal powder and a series of cycles of applying energy to the metal powder to melt and solidify the metal powder. As shown in FIG. 6, in this laminated molding, the header flow path 3 is at least partially arranged within the formation range 2A of the plurality of internal flow paths 2 in the extending direction of the plurality of internal flow paths 2, and the header. The portion where the flow path 3 is provided (header portion) and the portion where the plurality of internal flow paths 2 are provided (main body portion) are formed by a series of cycles.

According to such a method of manufacturing the heat exchange core 1, the header flow path 3 is arranged within the formation range 2A of the internal flow path 2 in the extending direction, and the portion where the header flow path 3 is provided and a plurality of internal flow paths are provided. Since the portion where 2 is provided is formed by a series of cycles, the size of the heat exchange core 1 in the extending direction of the internal flow path 2 can be suppressed, the heat exchange core 1 can be made compact, and the heat exchange core can be made compact. The modeling time of 1 can be shortened.

[Frequency of energy application]
In the step of melting and solidifying the metal powder, the frequency of applying energy to the portion where the header flow path 3 is provided (header portion 12) is lower than that of the portion where the plurality of internal flow paths 2 are provided (main body portion 11). For example, when the metal powder is melt-solidified by laser irradiation in the laminated molding of the internal flow path 2 and the header flow path 3 described above, the laser is applied to the metal powder in the laminated molding of the portion (main body portion 11) where the internal flow path 2 is provided. The number of times of irradiating the metal powder is the same as the number of times of laying the metal powder, while the number of times of irradiating the metal powder with the laser in the laminated molding of the portion where the header flow path 3 is provided (header portion 12) is half the number of times of laying the metal powder. To. That is, in the laminated molding of the main body portion 11, the number of times of irradiating the laser is set to 1 for each number of times of spreading the metal powder, while in the laminated molding of the header portion 12, the laser is applied for the number of times of spreading the metal powder twice. The number of irradiations is set to 1. In other words, in the laminated molding of the main body portion 11, the laser is irradiated every time the metal powder is spread, while in the laminated molding of the header portion 12, the laser irradiation is skipped once every two times.

According to such a method of manufacturing the heat exchange core 1, the frequency of applying energy to the portion where the header flow path 3 is provided is lower than that of the portion where the internal flow path 2 is provided, so that the header flow path 3 is provided. The molding time per unit area of the portion to be formed can be made shorter than that of the portion where the internal flow path 2 is provided. Therefore, since the molding time of the entire heat exchange core 1 can be shortened, the manufacturing cost of the heat exchange core 1 can be reduced. That is, in the above-mentioned example, in the laminated molding of the main body portion 11, the laser is irradiated every time the metal powder is spread, while in the laminated molding of the header portion 12, the laser irradiation is skipped once every two times, so that the laser irradiation is skipped once. The molding time can be shortened by the amount, and the manufacturing cost of the heat exchange core 1 can be reduced.

The present invention is not limited to the above-described embodiment, and includes a modified form of the above-described embodiment and a combination of these embodiments as appropriate.

The contents described in each of the above embodiments are grasped as follows, for example.

(1) The heat exchange core 1 according to one aspect is
A plurality of internal flow paths 2 and
A header flow path 3 communicating with the plurality of internal flow paths 2 and
With
The inner wall 3a of the header flow path 3 has a surface roughness larger than that of the flow path wall 2a of the inner flow path 2.

For example, in the Japanese Industrial Standards (JIS), arithmetic average roughness (Ra), maximum height (Ry), ten-point average roughness (Rz), and average spacing of irregularities (Sm) are used as parameters representing surface roughness. , The definition and display of the average interval (S) and load length ratio (tp) of the local peaks are specified, and the surface roughness is the arithmetic mean value of each part randomly extracted from the surface of the object. It is said that there is.

According to the heat exchange core 1 according to the present disclosure, the inner wall 3a of the header flow path 3 has a surface roughness larger than that of the flow path wall 2a of the inner flow path 2. Therefore, when the heat exchange core 1 is formed by laminated molding. In the above, the molding time per unit volume of the portion where the header flow path 3 is provided can be made shorter than the portion where the internal flow path 2 is provided. Therefore, since the molding time can be shortened for the entire heat exchange core 1, the manufacturing cost of the heat exchange core 1 can be reduced.

(2) The heat exchange core 1 according to another aspect is the heat exchange core 1 according to (1).
The plurality of internal flow paths 2 extend in parallel with each other, and the plurality of internal flow paths 2 extend in parallel with each other.
The header flow path 3 is
A first region (overhang region) 2a1 located on one side of the plurality of internal flow paths 2 in the extending direction and having a first surface roughness,
A second region (non-overhang region) 2a2 located on the other side in the extending direction and having a second surface roughness equal to or lower than the first surface roughness.
Including
The second surface roughness of the inner wall 3a of the header flow path 3 is larger than the surface roughness of the flow path wall 2a of the inner flow path 2.

According to such a configuration, the second surface roughness of the second region (non-overhang region) 3a2 of the header flow path 3 is equal to or less than the first surface roughness of the first region (overhang region) 3a1. The second region (non-overhang region) 3a2 of 3 is larger than the surface roughness of the flow path wall 2a of the internal flow path 2.
Therefore,
The first surface roughness of the first region 3a1 ≧ the surface roughness of the second region 3a2> the surface roughness of the flow path wall 2a of the internal flow path 2.
That is, the surface roughness of the second region (non-overhang region) 3a2 is equal to or less than the surface roughness of the first region (overhang region) 3a1, and the modeling time per unit area of the portion where the second region 3a2 is provided is internally included. It can be made shorter than the portion where the flow path 2 is provided. Therefore, since the molding time of the heat exchange core 1 can be shortened as a whole, the manufacturing cost of the heat exchange core 1 can be reduced.

(3) The heat exchange core 1 according to still another aspect is the heat exchange core 1 according to (1) or (2).
The header flow path 3 is at least partially arranged in the formation range 2A of the plurality of internal flow paths 2 in the extending direction of the plurality of internal flow paths 2.

According to such a configuration, since the header flow path 3 is arranged within the formation range 2A of the internal flow path 2 in the extending direction, the dimension of the heat exchange core 1 in the extending direction of the internal flow path 2 is suppressed. , The heat exchange core 1 can be made compact.

(4) The heat exchange core 1 according to another aspect is the heat exchange core 1 according to any one of (1) to (3).
The partition wall 4a between the header flow path 3 and the intermediate flow path 4 through which the other fluid flows is along the extending direction of the internal flow path 2.

According to such a configuration, the partition wall 4a that separates different fluids does not have an overhang shape, so that the partition wall 4a can be thinned. Therefore, the header flow path 3 can be moved inward toward the internal flow path 2 arrangement region side, and the heat exchange core 1 can be made compact.

(5) The heat exchange core 1 according to another aspect is the heat exchange core 1 according to any one of (1) to (4).
An intermediate flow path 4 provided adjacent to the end of the internal flow path 2 is provided.
The inner wall 3a of the header flow path 3 includes a curved surface 3a3 having an arc shape, and the partition wall 4a has a part of the curved surface 3a3 on the surface.
The center of curvature 3a31 of the curved surface 3a3 is located within the formation range 4A of the intermediate flow path 4 in the extending direction of the internal flow path 2.

By doing so, in the inner wall of the header flow path 3 having the arc-shaped curved surface 3a3, the tangential direction of the arc shape can be made along the extension direction of the internal flow path 2, and the thinning of the partition wall can be simplified. This can be achieved by the shape of the flow path.

(6) The method for manufacturing the heat exchange core 1 according to one aspect is as follows.
A method for manufacturing a heat exchange core 1 including a plurality of internal flow paths 2 extending in parallel with each other and a header flow path 3 communicating with the plurality of internal flow paths 2.
A step of forming the internal flow path 2 by performing laminated modeling along the extending direction of the internal flow path 2 and a step of forming the internal flow path 2.
A step of forming the header flow path 3 by performing laminated modeling along the extending direction, and a step of forming the header flow path 3.
With
The inner wall 3a of the header flow path 3 is
It has a surface roughness larger than that of the flow path wall 2a of the internal flow path 2.

According to the method for manufacturing the heat exchange core 1 according to the present disclosure, since the inner wall 3a of the header flow path 3 has a surface roughness larger than that of the flow path wall 2a of the inner flow path 2, the step of forming the header flow path 3 The molding time per unit volume in the above can be made shorter than the portion where the internal flow path 2 is provided. Therefore, since the heat exchange core 1 can shorten the entire molding time, the manufacturing cost of the heat exchange core 1 can be reduced.

(7) The method for manufacturing the heat exchange core 1 according to another aspect is the method for manufacturing the heat exchange core 1 according to (6).
The laminated modeling is
It includes a repetition of a series of cycles consisting of a step of spreading the metal powder and a step of applying energy to the metal powder to melt and solidify the metal powder.
The header flow path 3 is at least partially arranged in the formation range 2A of the plurality of internal flow paths 2 in the extending direction.
The portion where the header flow path 3 is provided and the portion where the plurality of internal flow paths 2 are provided are formed by the series of cycles.

According to such a method, the header flow path 3 is arranged within the formation range 2A in the extending direction of the internal flow path 2, and the portion where the header flow path 3 is provided and the portion where the plurality of internal flow paths 2 are provided are provided. Since the molding is performed by a series of cycles, the dimensions of the heat exchange core 1 in the extending direction of the internal flow path 2 can be suppressed, the heat exchange core 1 can be made compact, and the molding time of the heat exchange core 1 can be shortened. can.

(8) The method for manufacturing the heat exchange core 1 according to still another aspect is the method for manufacturing the heat exchange core 1 according to (7).
In the step of melting and solidifying the metal powder, the frequency of applying energy to the portion where the header flow path 3 is provided is lower than that of the portion where the plurality of internal flow paths 2 are provided.

According to such a method, since the frequency of applying energy to the portion where the header flow path 3 is provided is lower than that of the portion where the internal flow path 2 is provided, per unit area of the portion where the header flow path 3 is provided. The modeling time of the above can be made shorter than that of the portion where the internal flow path 2 is provided. Therefore, since the molding time of the entire heat exchange core 1 can be shortened, the manufacturing cost of the heat exchange core 1 can be reduced.

1 Heat exchange core 11 Main body 111 Outer wall (bottom wall)
112 Outer wall (side wall)
116 Outer wall (upper wall)
12 Header part 121 1st header part 122 2nd header part 123 3rd header part 124 4th header part 2 Internal flow path 2A Internal flow path formation range 2a Flow path wall 21 1st flow path 21a Flow path wall 211 Divided flow Road 22 Second flow path 22a Flow path wall 221 Divided flow path 23 Partition wall 24 Partition wall 3 Header flow path 3a Inner wall of header flow path 3a1 First area 3a2 Second area 3a3 Curved surface 3a31 Curvature center 31 First header flow path 31a Inner wall 32 Second header flow path 32a Inner wall 33 Third header flow path 33a Inner wall 34 Fourth header flow path 34a Inner wall 4 Intermediate flow path 4A Formation range 4a Partition 41 First intermediate flow path 42 Second intermediate flow path 42a Partition

Claims (8)

With multiple internal channels
A header flow path communicating with the plurality of internal flow paths and
With
The inner wall of the header flow path has a larger surface roughness than the flow path wall of the inner flow path.
Heat exchange core. The plurality of internal flow paths extend parallel to each other, and the plurality of internal flow paths extend in parallel with each other.
The header flow path is
A first region located on one side of the plurality of internal flow paths in the extending direction and having a first surface roughness,
A second region located on the other side in the extending direction and having a second surface roughness equal to or lower than the first surface roughness,
Including
The heat exchange core according to claim 1, wherein the second surface roughness of the inner wall of the header flow path is larger than the surface roughness of the flow path wall of the inner flow path. The header flow path is at least partially arranged in the formation range of the plurality of internal flow paths in the extending direction of the plurality of internal flow paths.
The heat exchange core according to claim 1 or 2. The partition wall between the header flow path and the other intermediate flow path through which the fluid flows is along the extending direction of the internal flow path.
The heat exchange core according to any one of claims 1 to 3. An intermediate flow path provided adjacent to the end of the internal flow path is provided.
The inner wall of the header flow path includes a curved surface having an arc shape, and the partition wall has a part of the curved surface on the surface.
The center of curvature of the curved surface is located within the formation range of the intermediate flow path in the extending direction of the internal flow path.
The heat exchange core according to any one of claims 1 to 4. A method for manufacturing a heat exchange core including a plurality of internal flow paths extending in parallel with each other and a header flow path communicating with the plurality of internal flow paths.
A step of forming the internal flow path by performing laminated modeling along the extending direction of the internal flow path, and a step of forming the internal flow path.
The step of forming the header flow path by performing laminated modeling along the extending direction, and
With
The inner wall of the header flow path is
It has a surface roughness larger than that of the flow path wall of the internal flow path.
How to manufacture a heat exchange core. The laminated modeling is
It includes a repetition of a series of cycles consisting of a step of spreading the metal powder and a step of applying energy to the metal powder to melt and solidify the metal powder.
The header flow path is at least partially arranged in the formation range of the plurality of internal flow paths in the extending direction.
The portion provided with the header flow path and the portion provided with the plurality of internal flow paths are formed by the series of cycles.
The method for manufacturing a heat exchange core according to claim 6. In the step of melting and solidifying the metal powder, the frequency of applying energy to the portion provided with the header flow path is lower than that of the portion provided with the plurality of internal flow paths.
The method for manufacturing a heat exchange core according to claim 7.

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