JP7469177B2 - Heat exchange structure - Google Patents

Description

The present invention relates to a heat exchange structure that exchanges heat between fluids with different temperatures.

A conventional heat exchange structure for exchanging heat between fluids with temperature differences is the heat exchange structure of Patent Document 1. In this heat exchange structure, a first flow path for axially flowing a first fluid and a second flow path for axially flowing a second fluid are arranged alternately in the circumferential direction in a cylindrical flow path forming space between an inner cylinder and an outer cylinder, and the first flow path forming cylinders that form the first flow path are arranged side by side at intervals along the circumferential direction of the flow path forming space, and the second flow path is formed in the gap space between the first flow path forming cylinders adjacent in the circumferential direction, making it easier to manufacture.

JP 2019-128056 A

Incidentally, the heat exchange structure of Patent Document 1 can obtain a relatively high heat exchange efficiency by arranging the first and second flow paths alternately in the circumferential direction in the cylindrical flow path forming space between the inner and outer cylinders. However, since the subdivided first and second flow paths exchange heat only in the circumferential direction, in other words, the heat exchange is one-dimensional in cross-sectional view, it is still difficult to say that the heat exchange structure exhibits sufficient heat exchange efficiency. Therefore, there is a demand for a heat exchange structure that can achieve better heat exchange efficiency.

The present invention has been proposed in light of the above problems, and aims to provide a heat exchange structure that can perform heat exchange between fluids with temperature differences with extremely high heat exchange efficiency.

The heat exchange structure of the present invention is a heat exchange structure for exchanging heat between a first fluid and a second fluid having a temperature difference, the structure including an upstream blocking portion and a downstream blocking portion provided inside a main pipe through which the first fluid flows in an axial direction, a first fluid branch pipe extending in the axial direction of the main pipe connecting an upstream side of the upstream blocking portion with a downstream side of the downstream blocking portion, inlets of the first fluid branch pipe being disposed in the upstream blocking portion at intervals vertically and horizontally in a cross section of the main pipe, and outlets of the first fluid branch pipe being disposed in the downstream blocking portion at intervals vertically and horizontally in a cross section of the main pipe. a second fluid inlet and a second fluid outlet are disposed in a side blocking portion and communicate with the inside of the main pipe between the upstream blocking portion and the downstream blocking portion, one of the second fluid inlet and the second fluid outlet is disposed closer to the upstream blocking portion and the other closer to the downstream blocking portion, a straightening wall extending in the axial direction of the first fluid branch pipe is disposed between the first fluid branch pipes at an intermediate portion in the axial direction of the first fluid branch pipe, and the second fluid is caused to flow around the outside of the first fluid branch pipe so as to approximately follow the first fluid branch pipe and the straightening wall.
According to this, the first fluid and the second fluid can be two-dimensionally heat exchanged in various directions in a cross-sectional view of the first fluid branch pipe, and by flowing the second fluid substantially along the first fluid branch pipe and the flow straightening wall, the effective heat exchange area can be increased, and heat exchange can be performed with very high heat exchange efficiency. Furthermore, since the first fluid is made to flow consistently in the axial direction of the main pipe, turbulence of the first fluid can be suppressed, and pressure loss of the flow of the first fluid can be suppressed.

The heat exchange structure of the present invention is characterized in that the inlet of the first fluid branch pipe is arranged in a mesh-like manner over the entire surface of the pipe cross-section of the main pipe in the upstream blocking portion, and the outlet of the first fluid branch pipe is arranged in a mesh-like manner over the entire surface of the pipe cross-section of the main pipe in the downstream blocking portion.
According to this, by arranging the inlets and outlets of the first fluid branch pipe in a net-like manner over the entire surface of the cross section of the main pipe, the first fluid branch pipe can be further subdivided to further increase the heat exchange area between the first and second fluids, thereby achieving even higher heat exchange efficiency.

The heat exchange structure of the present invention is characterized in that the second fluid inlet is disposed closer to the downstream blocking portion, and the second fluid outlet is disposed closer to the upstream blocking portion.
This makes it possible to reliably maintain the temperature difference between the first and second fluids from the time the second fluid is introduced through the second fluid inlet until the second fluid is discharged through the second fluid outlet, thereby achieving even higher heat exchange efficiency.

The heat exchange structure of the present invention is characterized in that the straightening wall is provided only in the intermediate portion of the first fluid branch pipe, and the second fluid is caused to flow through the gaps between the first fluid branch pipes so as to cross the first fluid branch pipes in a second fluid inlet portion and a second fluid outlet portion located on both axial sides of the intermediate portion in the main pipe.
According to this, since it is not necessary to provide a straightening wall in the second fluid inlet portion and the second fluid outlet portion, it is possible to manufacture, for example, by extending only the branch flow path of the first fluid of the honeycomb structure by joining a pipe, and to make it into a first fluid branch pipe, and it is possible to manufacture efficiently and at low cost. Furthermore, since it is not necessary to provide a structure with a straightening wall in the second fluid inlet portion and the second fluid outlet portion, it is possible to reduce the size of the second fluid inlet portion and the second fluid outlet portion, thereby reducing the size of the heat exchange structure and saving the space required for installation. Furthermore, since it is not necessary to provide a complex structure with a straightening wall in the second fluid inlet portion and the second fluid outlet portion, it is possible to facilitate repair in the event of a breakdown and improve maintainability.

The heat exchange structure of the present invention is characterized in that a portion of the first fluid branch pipe located at the second fluid inlet portion and a portion of the first fluid branch pipe located at the second fluid outlet portion are formed with an area having a smaller outer peripheral dimension than a portion of the first fluid branch pipe located at the intermediate portion.
According to this, even when the number of first fluid branch pipes arranged in parallel is increased to increase the arrangement density in order to further increase the heat exchange area between the first fluid and the second fluid, the area of the first fluid branch pipe with a small outer circumferential dimension can ensure a gap in the second fluid inlet portion and the second fluid outlet portion through which the second fluid can flow smoothly.

The heat exchange structure of the present invention is characterized in that at least a portion of the first fluid branch pipe located at the second fluid outlet portion is formed with a twisted portion at which a pipe line is twisted .
According to this, the twisted portion of the first fluid branch pipe located in the second fluid outlet portion turbulently causes the second fluid that has exchanged heat with the first fluid to be mixed, promoting mixing of the fluid masses and further improving the heat transferability and heat exchangeability of the second fluid.

The heat exchange structure of the present invention is characterized in that a first twisted portion is formed in a portion of the first fluid branch pipe located at the second fluid inlet portion, and a second twisted portion is formed in a portion of the first fluid branch pipe located at the second fluid outlet portion, and a region having a smaller outer circumferential dimension than a portion of the first fluid branch pipe located at the intermediate portion is formed in the first twisted portion and the second twisted portion.
According to this, the second twisted portion of the first fluid branch pipe located in the second fluid outlet portion turbulizes the second fluid that has exchanged heat with the first fluid, promoting mixing of the fluid masses, and further improving the heat transferability and heat exchangeability of the second fluid. Also, even if the number of first fluid branch pipes arranged in parallel is increased to increase the arrangement density in order to further increase the heat exchange area between the first and second fluids, the small outer circumferential dimension areas of the first fluid branch pipe in the first twisted portion and the second twisted portion can ensure gaps in the second fluid inlet portion and the second fluid outlet portion through which the second fluid flows smoothly. Also, the small outer circumferential dimension areas of the first fluid branch pipe in the second fluid inlet portion and the second fluid outlet portion are formed by the first twisted portion and the second twisted portion having the same configuration, thereby facilitating the manufacturing work.

The heat exchange structure of the present invention is characterized in that the first fluid branch pipe is formed of a material having a higher thermal conductivity than the main pipe.
This allows heat dissipation to be suppressed in the main pipe, which has a relatively low thermal conductivity, while excellent heat exchange can be performed via the first fluid branch pipe, which has a relatively high thermal conductivity, thereby promoting the effective use of thermal energy overall.

The heat exchange structure of the present invention is characterized in that an inlet of the first fluid branch pipe is arranged in a staggered arrangement in the pipe cross section of the main pipe at the upstream blocking portion, and an outlet of the first fluid branch pipe is arranged in a staggered arrangement in the pipe cross section of the main pipe at the downstream blocking portion.
This makes it possible to equalize the size of each branch flow path of the first fluid by the first fluid branch pipe, and at the same time, it is possible to easily equalize the size of each branch flow path of the second fluid that flows approximately along the first fluid branch pipe and the straightening wall, without generating any wasted space.

The heat exchange structure of the present invention allows heat exchange between fluids with temperature differences to be performed with extremely high heat exchange efficiency.

1 is a perspective view of a heat exchange structure according to an embodiment of the present invention; FIG. 2 is a vertical sectional perspective view of a heat exchange structure according to the embodiment. FIG. 3 is an enlarged view of the periphery of the second fluid introduction portion of FIG. 2 . FIG. 3 is an enlarged view of the periphery of the second fluid introduction portion of FIG. 2 . FIG. 4 is an explanatory diagram of a first fluid branch pipe in the heat exchange structure of the embodiment. FIG. 7A is an enlarged end view taken along line AA in FIG. 6, and FIG. 7B is an enlarged cross-sectional view taken along line AA in FIG. FIG. 7 is an enlarged cross-sectional view taken along the line B-B of FIG. 6;

[Heat exchange structure of the embodiment]
A heat exchange structure 1 according to an embodiment of the present invention performs heat exchange between a first fluid F1 and a second fluid F2 having a temperature difference, and has a substantially cylindrical main pipe 2 through which the first fluid F1 flows in the axial direction, and is provided at one axial end of the main pipe 2 with a substantially tapered cylindrical first fluid inlet 21 that gradually reduces in diameter toward the edge, and at the other axial end with a substantially tapered cylindrical first fluid outlet 22 that gradually reduces in diameter toward the edge. Between the first fluid inlet 21 and the first fluid outlet 22 is a cylindrical base 23 having substantially the same diameter or substantially the same outer circumferential dimension over the entire length.

Inside the main pipe 2, an upstream blocking section 3 is provided upstream of the flow of the first fluid F1, and a downstream blocking section 4 is provided downstream of the upstream blocking section 3 (see Figures 2 to 4). In this embodiment, inside the main pipe 2, the upstream blocking section 3 is arranged to separate the first fluid introduction section 21 and the base section 23, and the downstream blocking section 4 is arranged to separate the base section 23 and the first fluid discharge section 22. Inside the main pipe 2, the upstream side of the upstream blocking section 3 in the flow of the first fluid F1 and the downstream side of the downstream blocking section 4 are connected by a first fluid branch pipe 5 arranged in parallel to extend in the axial direction of the main pipe 2 (see Figures 2 to 5, 7, and 8).

The first fluid branch pipe 5 and the main pipe 2 may be made of the same material with the same thermal conductivity, for example, a metal material such as stainless steel (thermal conductivity: 27 [W/m·k]). However, it is preferable to make the first fluid branch pipe 5 from a material with a higher thermal conductivity than the main pipe 2, for example, by making the first fluid branch pipe 5 from a metal material with a high thermal conductivity such as aluminum (thermal conductivity: 237 [W/m·k]) or a resin material with a high thermal conductivity, and making the main pipe 2 from a metal material with a lower thermal conductivity than the first fluid branch pipe 5, such as stainless steel (thermal conductivity: 27 [W/m·k]), or a resin material with a lower thermal conductivity.

The inlets 51 of the first fluid branch pipe 5 are arranged in the upstream closure section 3 at intervals in the vertical and horizontal directions in the cross section of the main pipe 2, and preferably, the inlets 51 of the first fluid branch pipe 5 are arranged in a net-like manner over the entire cross section of the main pipe 2 in the upstream closure section 3, and more preferably, in a staggered arrangement. The outlets 52 of the first fluid branch pipe 5 are also arranged in the downstream closure section 4 at intervals in the vertical and horizontal directions in the cross section of the main pipe 2, and preferably, the outlets 52 of the first fluid branch pipe 5 are arranged in a net-like manner over the entire cross section of the main pipe 2 in the downstream closure section 4, and more preferably, in a staggered arrangement.

The inside of the main pipe 2 between the upstream blocking section 3 and the downstream blocking section 4 is a heat exchange area HR, and a second fluid inlet 61 and a second fluid outlet 62 through which the second fluid F2 flows are provided so as to communicate with the inside of the main pipe 2 in this heat exchange area HR. One of the second fluid inlet 61 and the second fluid outlet 62 is located closer to the upstream blocking section 3, and the other is located closer to the downstream blocking section 4. In this embodiment, the second fluid inlet 61 is located closer to the downstream blocking section 4, and the second fluid outlet 62 is located closer to the upstream blocking section 3.

In the heat exchange region HR inside the main pipe 2, the position corresponding to the second fluid inlet 61 is the second fluid inlet section 71 to which the second fluid inlet 61 is connected, and the position corresponding to the second fluid outlet 62 is the second fluid outlet section 72 to which the second fluid outlet 62 is connected. The portion located between the portion located at the second fluid inlet section 71 and the portion located at the second fluid outlet section 72 in the axial direction of the first fluid branch pipe 5 is the intermediate portion 53 of the first fluid branch pipe 5, and in the axial intermediate portion 53 of the first fluid branch pipe 5, a flow straightening wall 8 extending in the axial direction of the first fluid branch pipe 5 is installed between the first fluid branch pipes 5, 5.

In this embodiment, the straightening wall 8 is provided only in the intermediate portion 53 of the first fluid branch pipe 5, and the straightening wall 8 is not provided in the portion located at the second fluid introduction portion 71 of the first fluid branch pipe 5 and the portion located at the second fluid discharge portion 72. In the second fluid introduction portion 71 and the second fluid discharge portion 72 located on both axial sides of the intermediate portion 53 of the first fluid branch pipe 5 in the main pipe 2, the second fluid F2 flows through the gap G between the first fluid branch pipes 5, 5 so as to cross the first fluid branch pipe 5.

A first twisted portion 56 is formed in the portion of the first fluid branch pipe 5 located at the second fluid inlet portion 71, where the pipe and the pipeline are twisted, and a second twisted portion 55 is formed in the portion of the first fluid branch pipe 5 located at the second fluid outlet portion 72, where the pipe and the pipeline are twisted. The first twisted portion 56 and the second twisted portion 55 are formed by being twisted so as to be stretched, so that an area having a smaller outer circumferential dimension or outer diameter is formed than the portion of the first fluid branch pipe 5 located at the intermediate portion 53 or the intermediate portion of the first fluid branch pipe 5. This area having a smaller outer circumferential dimension or outer diameter ensures a gap G between the first fluid branch pipes 5, 5 at the second fluid inlet portion 71 and the second fluid outlet portion 72, even when the number of first fluid branch pipes 5 is increased to increase the density at which the first fluid branch pipes 5 are arranged side by side.

When using the heat exchange structure 1 of this embodiment, the first fluid F1 is caused to flow from the upstream side to the downstream side in the main pipe 2, and the second fluid F2, which is lower or higher in temperature than the first fluid F1, is introduced by flowing it from the second fluid inlet 61 to the second fluid introduction section 71 in the main pipe 2. In the second fluid introduction section 71, the second fluid F2 flows through the gap G between the first fluid branch pipes 5, 5 while being turbulently formed and swirled in the first fluid branch pipe 5 and its first twisted section 56 .

The second fluid F2 that has flowed through the gap G flows outside the first fluid branch pipe 5 in a region corresponding to the intermediate portion 53 of the first fluid branch pipe 5, and flows through a branch flow path f21 surrounded by the peripheral wall 54 and the straightening wall 8 of the first fluid branch pipe 5, and a branch flow path f22 surrounded by the base peripheral wall 24 provided on the base pipe 2 and the peripheral wall 54 and straightening wall 8 of the first fluid branch pipe 5 at a position corresponding to the intermediate portion 53. By flowing through these flow paths, the second fluid F2 flows outside the first fluid branch pipe 5 in a direction in which the first fluid branch pipe 5 and the straightening wall 8 extend, approximately along the first fluid branch pipe 5 and the straightening wall 8.

The second fluid F2 exchanges heat with the first fluid F1 through the peripheral wall 54 of the first flow path branch pipe 5, and flows out from the branch flow paths f21, f22 to the second fluid discharge section 72. In the second fluid discharge section 72, the second fluid F2 flows through the gap G between the first fluid branch pipes 5, 5 while being turbulent and vortexized in the first fluid branch pipe 5 and its second twisted section 55 , and is discharged from the second fluid discharge section 72 to the second fluid discharge outlet 62.

According to this embodiment, heat exchange between the first fluid F1 and the second fluid F2 can be performed two-dimensionally in various directions in a cross-sectional view of the first fluid branch pipe 5, and by flowing the second fluid F2 approximately along the first fluid branch pipe 5 and the flow straightening wall 8, the effective heat exchange area can be increased, and heat exchange can be performed with very high heat exchange efficiency. In addition, since the first fluid F1 is consistently flowed in the axial direction of the main pipe 2, turbulence of the first fluid F1 can be suppressed, and pressure loss in the flow of the first fluid F1 can be suppressed.

In addition, by arranging the inlet 51 and outlet 52 of the first fluid branch pipe 5 in a net-like manner over the entire cross section of the main pipe 2, the first fluid branch pipe 5 can be further subdivided to further increase the heat exchange area between the first fluid F1 and the second fluid F2, thereby achieving even higher heat exchange efficiency.

In addition, by positioning the second fluid inlet 61 closer to the downstream blocking section 4 and the second fluid outlet 62 closer to the upstream blocking section 3, the temperature difference between the first fluid F1 and the second fluid F2 can be reliably maintained from when the second fluid F2 is introduced through the second fluid inlet 61 until when the second fluid F2 is discharged through the second fluid outlet 62, thereby achieving even higher heat exchange efficiency.

In addition, the straightening wall 8 is provided only in the intermediate portion 53 of the first fluid branch pipe 5, and the second fluid F2 flows through the gap G between the first fluid branch pipes 5 and 5 in the second fluid inlet portion 71 and the second fluid outlet portion 72 so as to cross the first fluid branch pipe 5. This means that there is no need to provide the straightening wall 8 in the second fluid inlet portion 71 and the second fluid outlet portion 72. For example, it is possible to extend only the branch flow path of the first fluid of the honeycomb structure by joining a pipe, etc., to form the first fluid branch pipe 5, and this makes it possible to manufacture the first fluid branch pipe 5 efficiently and at low cost. In addition, since there is no need to provide the straightening wall 8 in the second fluid inlet portion 71 and the second fluid outlet portion 72, the second fluid inlet portion 71 and the second fluid outlet portion 72 can be made smaller, which can reduce the size of the heat exchange structure 1 and the space required for installation. In addition, the second fluid inlet 71 and the second fluid outlet 72 do not require a complex structure that requires the provision of a straightening wall 8, which makes it easier to repair in the event of a breakdown and improves maintainability.

Furthermore, in the portion of the first fluid branch pipe 5 located at the second fluid inlet portion 71 and the portion of the first fluid branch pipe 5 located at the second fluid outlet portion 72, there are formed areas having smaller outer circumferential dimensions than the portion of the first fluid branch pipe 5 located at the intermediate portion 53, i.e., in this embodiment, areas of the first fluid branch pipe at the first twisted portion 56 and the second twisted portion 55.By doing so, even when the number of first fluid branch pipes 5 arranged in parallel is increased to increase the arrangement density in order to further increase the heat exchange area between the first fluid F1 and the second fluid F2, a gap G through which the second fluid F2 can flow smoothly can be secured in the second fluid inlet portion 71 and the second fluid outlet portion 72.

Moreover, the second torsion portion 55 of the first fluid branch pipe 5 located in the second fluid outlet portion 72 turbulently flows the second fluid F2 that has exchanged heat with the first fluid F1, promoting mixing of the fluid masses and further improving the heat transferability and heat exchangeability of the second fluid F2. Moreover, by forming the areas with small outer circumferential dimensions of the first fluid branch pipe 5 of the second fluid inlet portion 71 and the second fluid outlet portion 72 with the first torsion portion 56 and the second torsion portion 55 of the same configuration, the manufacturing work can be simplified.

In addition, if the first fluid branch pipe 5 is made of a material with a higher thermal conductivity than the main pipe 2, heat dissipation can be suppressed in the main pipe 2, which has a relatively low thermal conductivity, while excellent heat exchange can be achieved via the first fluid branch pipe 5, which has a relatively high thermal conductivity, thereby promoting the effective use of thermal energy overall.

In addition, the inlets 51 of the first fluid branch pipes 5 are arranged in a staggered configuration in the cross section of the main pipe 2 at the upstream blocking section 3, and the outlets 52 of the first fluid branch pipes 5 are arranged in a staggered configuration in the cross section of the main pipe 2 at the downstream blocking section 4, in other words, by arranging the first fluid branch pipes 5 in a staggered configuration in cross section, the size of each branch flow path of the first fluid F1 by the first fluid branch pipes 5 can be equalized, and at the same time, the size of each branch flow path of the second fluid F2 that flows approximately along the first fluid branch pipes 5 and the straightening wall 8 can be easily equalized without generating wasted space.

[Scope of the invention disclosed herein]
The invention disclosed in this specification includes, in addition to each invention and embodiment listed as the invention, those specified by changing partial contents of these to other contents disclosed in this specification, those specified by adding other contents disclosed in this specification to these contents, or those specified by deleting partial contents of these to the extent that partial action and effect can be obtained, and specifying them as a higher conceptualization. The invention disclosed in this specification also includes the following modified examples and added contents.

For example, the flow rates of the first fluid F1 and the second fluid F2 can be appropriately set within an applicable range, and for example, when the first fluid F1 is a gas such as exhaust gas, the flow rate of the first fluid F1 can be set to 10 to 150 g/sec, and when the second fluid F2 is a liquid such as cooling water, the flow rate of the second fluid F2 can be set to 10 to 40 L/min. In addition, the flow path cross-sectional area of the first fluid branch pipe 5 and the flow path cross-sectional area of each branch flow path of the second fluid F2 that flows approximately along the first fluid branch pipe 5 in a region corresponding to the intermediate portion 53 of the first fluid branch pipe 5 can be appropriately set within an applicable range, but from the viewpoint of increasing the heat exchange area while reducing the pressure loss of the flow of the first fluid F1 and the pressure loss of the flow of the second fluid F2 in a balanced manner, it is preferable to set the flow path cross-sectional area of the first fluid branch pipe 5 to 0.25 mm ² to 4.0 mm ² and the flow path cross-sectional area of each branch flow path of the second fluid F2 to 0.25 mm ² to 4.0 mm ² , for example.

The flow rate ratio between the flow rate cross-sectional area of the first fluid branch pipe 5 and the flow rate cross-sectional area of each branch flow rate of the second fluid F2 that flows approximately along the first fluid branch pipe 5 in the region corresponding to the intermediate portion 53 of the first fluid branch pipe 5 may be any suitable ratio within an applicable range, and may be, for example, 1:1 to 1:2.5. In this case, as in the example of Figures 7 and 8, in a configuration in which the first fluid branch pipes 5 are arranged in a staggered arrangement and a branch flow rate of the second fluid F2 that is octagonal in cross section is provided outside the first fluid branch pipe 5 that is rectangular in cross section, it is preferable because the flow rate ratio can be changed simply by changing the length of the sides of the octagon.

The present invention can be used for heat exchange between fluids with temperature differences, such as the heat exchange between the exhaust gas and the coolant of an automobile internal combustion engine.

REFERENCE SIGNS LIST 1...Structural body of heat exchange structure 2...Main pipe 21...First fluid inlet portion 22...First fluid outlet portion 23...Base portion 24...Base peripheral wall 3...Upstream blocking portion 4...Downstream blocking portion 5...First fluid branch pipe 51...Inlet 52...Outlet 53...Middle portion 54...Peripheral wall 56 ...First twisted portion 55 ...Second twisted portion 61...Second fluid inlet port 62...Second fluid outlet port 71...Second fluid inlet portion 72...Second fluid outlet portion 8...Flow straightening wall F1...First fluid F2...Second fluid f21, f22...Branched flow paths of second fluid HR...Heat exchange region G...Gap

Claims (7)

A heat exchange structure for performing heat exchange between a first fluid and a second fluid having a temperature difference,
an upstream blocking portion and a downstream blocking portion are provided inside a connecting pipe through which the first fluid flows in an axial direction;
the upstream side of the upstream closing portion of the main pipe and the downstream side of the downstream closing portion of the main pipe are connected to each other by a first fluid branch pipe extending in the axial direction of the main pipe,
the inlets of the first fluid branch pipes are disposed in the upstream blocking portion at intervals in the vertical and horizontal directions in a cross section of the main pipe;
the outlets of the first fluid branch pipe are disposed in the downstream blocking portion at intervals in the vertical and horizontal directions in a cross section of the main pipe;
a second fluid inlet and a second fluid outlet communicating with an inside of the connecting pipe are provided between the upstream blocking portion and the downstream blocking portion,
one of the second fluid inlet and the second fluid outlet is disposed closer to the upstream blocking portion, and the other is disposed closer to the downstream blocking portion;
a straightening wall extending in an axial direction of the first fluid branch pipe is disposed between the first fluid branch pipes at an intermediate portion in an axial direction of the first fluid branch pipe;
the second fluid is caused to flow outside the first fluid branch pipe so as to substantially follow the first fluid branch pipe and the flow straightening wall ,
the straightening wall is provided only in the intermediate portion of the first fluid branch pipe,
a second fluid is caused to flow through a gap between the first fluid branch pipes so as to cross the first fluid branch pipes in a second fluid inlet portion and a second fluid outlet portion located on both axial sides of the intermediate portion in the main pipe;
A heat exchange structure, comprising : at least a portion of the first fluid branch pipe located at the second fluid outlet portion, the portion having a twisted pipe line formed therein. A heat exchange structure for performing heat exchange between a first fluid and a second fluid having a temperature difference,
an upstream blocking portion and a downstream blocking portion are provided inside a connecting pipe through which the first fluid flows in an axial direction;
the upstream side of the upstream closing portion of the main pipe and the downstream side of the downstream closing portion of the main pipe are connected to each other by a first fluid branch pipe extending in the axial direction of the main pipe,
the inlets of the first fluid branch pipes are disposed in the upstream blocking portion at intervals in the vertical and horizontal directions in a cross section of the main pipe;
the outlets of the first fluid branch pipe are disposed in the downstream blocking portion at intervals in the vertical and horizontal directions in a cross section of the main pipe;
a second fluid inlet and a second fluid outlet communicating with an inside of the connecting pipe are provided between the upstream blocking portion and the downstream blocking portion,
one of the second fluid inlet and the second fluid outlet is disposed closer to the upstream blocking portion, and the other is disposed closer to the downstream blocking portion;
a straightening wall extending in an axial direction of the first fluid branch pipe is disposed between the first fluid branch pipes at an intermediate portion in an axial direction of the first fluid branch pipe;
the second fluid is caused to flow outside the first fluid branch pipe so as to substantially follow the first fluid branch pipe and the flow straightening wall,
the straightening wall is provided only in the intermediate portion of the first fluid branch pipe,
a second fluid is caused to flow through a gap between the first fluid branch pipes so as to cross the first fluid branch pipes in a second fluid inlet portion and a second fluid outlet portion located on both axial sides of the intermediate portion in the main pipe;
a first twisted portion is formed in a portion of the first fluid branch pipe located in the second fluid introduction portion,
a second twisted portion is formed in a portion of the first fluid branch pipe located in the second fluid outlet portion,
A heat exchange structure, characterized in that the first twisted portion and the second twisted portion each have an area having a smaller outer circumferential dimension than a portion of the first fluid branch pipe located in the intermediate portion . an inlet of the first fluid branch pipe is disposed in a net-like manner in the upstream blocking portion over an entire surface of a pipe cross section of the connecting pipe;
3. The heat exchange structure according to claim 1, wherein the outlet of the first branch pipe is disposed in a net-like manner over the entire surface of a cross section of the connecting pipe in the downstream closed portion. A heat exchange structure described in any one of claims 1 to 3, characterized in that the second fluid inlet is positioned closer to the downstream blocking portion, and the second fluid outlet is positioned closer to the upstream blocking portion. 2. The heat exchange structure according to claim 1, wherein a portion of the first fluid branch pipe located at the second fluid inlet portion and a portion of the first fluid branch pipe located at the second fluid outlet portion have an area having a smaller outer circumferential dimension than a portion of the first fluid branch pipe located at the intermediate portion. 6. The heat exchange structure according to claim 1, wherein the first branch pipe is made of a material having a higher thermal conductivity than the main pipe. the inlets of the first fluid branch pipes are disposed in the upstream blocking portion in a staggered arrangement in a cross section of the connecting pipe;
7. The heat exchange structure according to claim 1, wherein the outlets of the first fluid branch pipes are arranged in a staggered arrangement in the cross section of the main pipe at the downstream closed portion.

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