JP6330646B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a heat exchanger that exchanges heat between a fluid flowing inside a tube and a fluid flowing outside the tube.

  Conventionally, as this kind of heat exchanger, there is one described in Patent Document 1, for example. In the heat exchanger described in Patent Document 1, an inner fin is accommodated in a tube. The inner fin is formed in a predetermined shape by molding a metal thin plate. In the tube, two plates formed of a thin metal plate are joined to form a flow path inside. Each molding plate is formed with protruding inter-flow-path ribs so as to separate the internal flow paths, and the inner fins are fixed by sandwiching the center part in the width direction of the inner fins between the inter-flow-path ribs. Yes.

JP 2006-3025 A

  However, the inner fin of the conventional heat exchanger has a portion located in the flow path bent into a waveform with a constant fin pitch, and the portion sandwiched between the ribs has a different cross-sectional shape from the portion located in the flow path. Therefore, there is a problem that it is very difficult to process the inner fin.

  An object of this invention is to enable it to process an inner fin easily in view of the said point.

In order to achieve the above object, according to the first aspect of the present invention, the flow path through which the fluid flows is formed by joining the outer peripheral edges of the first plate (11) and the second plate (15) made of a thin metal plate. The heat exchanger includes a tube (1) formed on a metal plate and an inner fin (2) formed by bending a thin metal plate, and the tube is positioned on one end side in the tube longitudinal direction. An inlet side tank plate portion (111) that forms an inlet side tank space (112) into which fluid flows in from the outside, and an upstream side flow that guides the fluid that flows in from the inlet side tank space toward the other end in the tube longitudinal direction. An upstream channel plate (116) that forms a channel (117) and a U-turn plate that is located on the other end in the tube longitudinal direction and forms a U-turn space (119) into which fluid flows from the upstream channel ( And 18), arranged parallel to the upstream side flow passage adjacent the upstream flow path, the fluid flowing from the U-turn space forming the downstream flow path for guiding toward the tube longitudinal end (121) downstream An outlet side that forms an outlet side tank space (114) that is located on one end side in the longitudinal direction of the tube with the side channel plate (120) and that allows fluid to flow in from the downstream channel and flow out of the fluid that flows in to the outside A tank plate portion (113) and inter-channel ribs (122, 122a, 122b) that are located between the upstream channel and the downstream channel and project from the first plate toward the second plate. The inner fin includes an upstream fin portion (21) located in the upstream flow passage, a downstream fin portion (22) located in the downstream flow passage, an upstream fin portion and a downstream fin portion, Between the ribs between the channels and the second pre- The inter-flow-path fin portion (23) sandwiched and joined between the upstream fin portion, the downstream fin portion, and the inter-flow-flow fin portion have the same fin pitch and the longitudinal direction of the tube is a cross-sectional shape in the orthogonal direction is the same for, the surface to be bonded to the inner fin of the flow path between the ribs, the orthogonal direction of the cross-sectional shape with respect to the longitudinal direction of the tube, the flow path of the inner fin The cross-sectional shape in the direction orthogonal to the tube longitudinal direction of the surface joined to the inter rib is the same.

  According to this, since the inner fin can make the upstream fin portion, the downstream fin portion, and the inter-flow-path fin portion have the same fin pitch and the same cross-sectional shape, the inner fin is easily processed. be able to.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is a perspective view showing a heat exchanger concerning a 1st embodiment of the present invention partially fractured. It is sectional drawing of the orthogonal direction with respect to the tube longitudinal direction of the tube and inner fin of 1st Embodiment. It is sectional drawing of the orthogonal direction with respect to the tube longitudinal direction of the tube and inner fin of 1st Embodiment. It is sectional drawing of the orthogonal direction with respect to the tube longitudinal direction of the tube of 1st Embodiment. It is a top view of the 1st plate of a 1st embodiment. It is an enlarged view of the principal part of FIG. It is a top view of the inner fin and 1st plate of 1st Embodiment. It is a figure of the orthogonal direction with respect to the tube longitudinal direction which shows the 1st modification of the inner fin of 1st Embodiment. It is a figure of the direction orthogonal to the tube longitudinal direction which shows the 2nd modification of the inner fin of 1st Embodiment. It is a top view of the 1st plate in the heat exchanger concerning a 2nd embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described. The heat exchanger of this embodiment is used as an intercooler that cools intake air by exchanging heat between the intake air that has been pressurized by the supercharger and heated to a cooling fluid (for example, LLC).

  As shown in FIG. 1, the heat exchanger is provided with a large number of flat tubes 1 (details will be described later) in which flow paths through which a cooling fluid flows are formed. Inside the tube 1, an inner fin 2 (detailed later) that increases heat transfer area and promotes heat exchange is arranged.

  Intake air passes between adjacent tubes 1, and outer fins 3 that increase heat transfer area and promote heat exchange are arranged between adjacent tubes 1. The outer fin 3 is formed by corrugating a thin metal plate such as aluminum, and is joined to the tube 1 by brazing or the like.

  A plate-like flange 4 made of metal is disposed on one end side of the tube 1 in the stacking direction (hereinafter referred to as tube stacking direction). Intake air also passes between the flange 4 and the tube 1 adjacent to the flange 4, and the outer fin 3 is also disposed there.

  The flange 4 is provided with a pipe 41 to which a pipe (not shown) through which a cooling fluid flows is connected. And the external heat exchanger (not shown) which cools a cooling fluid and the heat exchanger of this embodiment are connected by the piping.

  Further, the flange 4 is fastened to the intake passage for the internal combustion engine (not shown) with a bolt or the like, so that the heat exchanger is fixed to the intake passage for the internal combustion engine.

  As shown in FIGS. 2 to 7, the tube 1 includes a first plate 11 and a second plate 15 in which a thin metal plate such as aluminum is press-formed into a predetermined shape, and the first plate 11 and the second plate 15. Are joined by brazing or the like, and a flow path through which the cooling fluid flows is formed inside.

  The second plate 15 has a flat plate shape except for the connecting tube portion 151 protruding outward.

  The first plate 11 includes an inlet-side tank plate portion 111 on one end side of the tube 1 in the longitudinal direction (the left-right direction in FIG. 5). An entrance side tank space 112 into which the cooling fluid cooled by an external heat exchanger flows is formed in the entrance side tank plate portion 111.

  The first plate 11 includes an outlet side tank plate portion 113 on one end side in the tube longitudinal direction. In the outlet side tank plate portion 113, an outlet side tank space 114 is formed in which the cooling fluid that has cooled the intake air flows and the flowing cooling fluid flows out to the external heat exchanger.

  The first plate 11 includes an inter-tank rib 115 between the inlet side tank space 112 and the outlet side tank space 114. The inter-tank rib 115 protrudes from the first plate 11 toward the second plate 15, the tip is joined to the second plate 15, and the entrance-side tank space 112 and the exit-side tank space 114 are partitioned. Yes. In addition, although mentioned later for details, the rib 115 between tanks is corresponded to the 1st stopper of this invention.

  The first plate 11 includes an upstream flow path plate portion 116 in the middle portion in the tube longitudinal direction. An upstream channel 117 that guides the cooling fluid flowing from the inlet side tank space 112 toward the other end in the tube longitudinal direction is formed in the upstream channel plate 116.

  The first plate 11 includes a U-turn plate portion 118 on the other end side in the tube longitudinal direction. A U-turn space 119 into which the cooling fluid flows from the upstream flow path 117 is formed in the U-turn plate portion 118.

  The first plate 11 includes a downstream flow path plate 120 at an intermediate portion in the tube longitudinal direction. A downstream channel 121 that guides the cooling fluid flowing from the U-turn space 119 toward one end in the tube longitudinal direction is formed in the downstream channel plate 120. The downstream channel 121 is disposed adjacent to the upstream channel 117 and parallel to the upstream channel 117.

  The first plate 11 includes an inter-channel rib 122 between the upstream channel 117 and the downstream channel 121. The inter-flow-path rib 122 protrudes toward the second plate 15 side.

  The first plate 11 includes a second stopper 123 that protrudes from the U-turn plate portion 118 toward the U-turn space 119 (details will be described later).

  The first plate 11 includes outer peripheral ribs 124 that are continuously formed over the entire outer peripheral edge. The outer peripheral rib 124 protrudes toward the second plate 5 and is joined to the outer peripheral edge of the second plate 15 by brazing or the like.

  The 1st plate 11 is provided with the connection cylinder part 125 which protrudes toward the exterior from the entrance side tank board part 111 and the exit side tank board part 113. FIG. The connection cylinder part 125 is joined to the connection cylinder part 151 of the second plate 15. In addition, the connection cylinder part 151 of the 2nd plate 15 adjacent to the flange 4 is joined with the pipe 41 (refer FIG. 1).

  The inner fin 2 is a straight fin in which a thin metal plate such as aluminum is bent at a constant fin pitch and press-formed into a wave shape, and the bent top portion extends linearly along the tube longitudinal direction. More specifically, the cross-sectional shape of the inner fin 2 is a sine wave shape, and the cross-sectional shape of the bent top portion of the inner fin 2 is an arc shape.

  The inner fin 2 includes an upstream fin portion 21 located in the upstream flow passage 117, a downstream fin portion 22 located in the downstream flow passage 121, and the upstream fin portion 21 and the downstream fin portion 22. The inter-flow-path fin part 23 which overlaps with the inter-flow-path rib 122 located in between is provided. These upstream fin portion 21, downstream fin portion 22, and inter-flow channel fin portion 23 have the same fin pitch and the same cross-sectional shape in the direction orthogonal to the tube longitudinal direction.

  As shown in FIG. 2, the cross-sectional shape in the direction orthogonal to the tube longitudinal direction in the inter-flow-path rib 122 is the same as the cross-sectional shape in the direction orthogonal to the tube longitudinal direction in the inner fin 2. More specifically, the shape of the surface joined to the inner fin 2 in the inter-channel rib 122 and the shape of the surface joined to the inter-channel rib 122 in the inner fin 2 are congruent.

  Thus, since the cross-sectional shape in the direction orthogonal to the tube longitudinal direction in the inter-flow-path rib 122 is the same as the cross-sectional shape in the direction orthogonal to the tube longitudinal direction in the inner fin 2, the upstream fin portion 21. The downstream fin portion 22 and the inter-flow channel fin portion 23 can have the same fin pitch and the same cross-sectional shape. Therefore, the inner fin 2 can be easily processed.

  The protrusion height H1 of the inter-channel rib 122 is lower than the protrusion height H2 of the outer peripheral rib 124 by the plate thickness t of the inner fin 2.

  As shown in FIGS. 5 and 6, the inter-flow-path rib 122 has one end in the tube longitudinal direction connected to the inter-tank rib 115, and the other end in the tube longitudinal direction connected to the second stopper 123.

  The width W1 in the alignment direction between the upstream flow path 117 and the downstream flow path 121 in the inter-rib rib 115 is greater than the width W2 in the alignment direction between the upstream flow path 117 and the downstream flow path 121 in the inter-flow path rib 122. Is also getting wider.

  The width W3 in the arrangement direction of the upstream flow path 117 and the downstream flow path 121 in the second stopper 123 is larger than the width W2 in the alignment direction of the upstream flow path 117 and the downstream flow path 121 in the inter-flow path rib 122. Is also getting wider.

  As shown in FIGS. 2 and 7, when the inner fin 2 is assembled to the first plate 11, the interflow channel fin portion 23 overlaps the interflow channel rib 122, and the upstream fin portion 21 is in the upstream flow channel 117. The downstream fin portion 22 is disposed in the downstream channel 121.

  The inner fin 2, the first plate 11, and the second plate 15 are joined by brazing or the like in a state where the inter-channel fin portion 23 is sandwiched between the inter-channel rib 122 and the second plate 15. By doing so, the upstream flow path 117 and the downstream flow path 121 are partitioned by the inter-flow path fin portion 23.

  In addition, the inter-flow channel fin portion 23 is positioned between the inter-tank rib 115 serving as the first stopper and the second stopper 123, and the inter-flow channel fin portion 23 abuts the inter-tank rib 115 so that one end in the longitudinal direction of the tube. The movement of the inner fin 2 toward the other end side in the tube longitudinal direction is restricted when the movement of the inner fin 2 to the side is restricted and the fin portion 23 between the channels contacts the second stopper 123.

  In the above configuration, the cooling fluid supplied from the external heat exchanger flows into the inlet side tank space 112 of each tube 1, flows into the U-turn space 119 through the upstream flow path 117, and further flows downstream. It flows into the outlet side tank space 114 through the path 121. And while a cooling fluid distribute | circulates in each tube 1, heat exchange with a cooling fluid and intake air is performed, and intake air is cooled.

  Here, when there is a gap between the fin portion 23 between the flow paths and the inter-tank rib 115, a so-called shortcut occurs in which the cooling fluid flows from the inlet side tank space 112 to the outlet side tank space 114 through the gap. To do. However, in this embodiment, since the inter-flow-path fin portion 23 is in contact with the inter-tank rib 115, in other words, no shortcut occurs.

  Further, since the projecting height H1 of the inter-channel rib 122 is made lower by the plate thickness t of the inner fin 2 than the projecting height H2 of the outer peripheral rib 124 (that is, H2 = H1 + t), the inter-channel fin portion 23 is used. Can be easily and reliably brought into contact with the second plate 15. Therefore, it is possible to prevent the cooling fluid from flowing into the outlet side tank space 114 through the gap between the top of the inter-flow-path fin portion 23 and the second plate 15.

  As described above, according to the present embodiment, the inner fin 2 has the upstream fin portion 21, the downstream fin portion 22, and the interflow channel fin portion 23 having the same fin pitch and the same cross-sectional shape. Therefore, the inner fin 2 can be easily processed.

  In the above embodiment, the cross-sectional shape of the inner fin 2 is a sine wave shape, but the cross-sectional shape of the inner fin 2 may be a triangular wave shape as in the first modification shown in FIG. As in the second modification shown in FIG.

(Second Embodiment)
A second embodiment of the present invention will be described. Only the parts different from the first embodiment will be described below.

  As shown in FIG. 10, the ribs between flow paths are divided into a plurality (two in this example) along the longitudinal direction of the tube. Specifically, the inter-flow-path ribs include a tank-side inter-flow-path rib 122a that is positioned closest to the inlet-side tank space 112 and connected to the inter-tank rib 115 among the plurality of inter-flow-path ribs, Of the inter-channel ribs, the U-turn side inter-channel ribs 122b located closest to the U-turn space 119 and connected to the second stopper 123 are divided.

  The inter-channel fin portion 23 of the inner fin 2 (not shown) is joined to at least the tank-side inter-channel rib 122a among the tank-side inter-channel rib 122a and the U-turn inter-channel rib 122b.

  According to this embodiment, the same effect as that of the first embodiment can be obtained.

  Further, the tank-side inter-channel ribs 122a and the second stopper 123 are shorter than the inter-channel ribs 122 of the first embodiment, so that the number of punched portions during press working is reduced, and the workability of the first plate 11 is improved. improves.

  In addition, in this embodiment, although the rib between flow paths was divided | segmented into two along the tube longitudinal direction, you may divide | segment the rib between flow paths into three or more along the tube longitudinal direction. Further, the U-turn side inter-channel rib 122b may be eliminated.

(Other embodiments)
In each of the above embodiments, the first plate 11 and the second plate 15 are separately press-molded, but the first plate 11 and the second plate 15 may be integrally press-molded.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably.

  Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible.

  In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where the element is clearly considered essential in principle. Yes.

  Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case.

  Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of the component, etc., the shape, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to the positional relationship or the like.

DESCRIPTION OF SYMBOLS 1 Tube 2 Inner fin 11 1st plate 15 2nd plate 21 Upstream fin part 22 Downstream fin part 23 Interflow channel fin part 111 Inlet side tank board part 112 Inlet side tank space 113 Outlet side tank board part 114 Outlet side tank Space 116 Upstream flow path plate part 117 Upstream flow path 118 U-turn plate part 119 U-turn space 120 Downstream flow path plate part 121 Downstream flow path 122 Inter-flow path rib 122a Tank-side inter-flow path rib (between flow paths rib)
122b U-turn side channel rib (channel rib)

Claims (8)

A tube (1) in which the outer peripheral edge portions of the first plate (11) and the second plate (15) made of a thin metal plate are joined and a flow path through which a fluid flows is formed, and the thin metal plate is bent. A heat exchanger comprising an inner fin (2) formed and disposed in the tube,
The tube
An inlet side tank plate portion (111) that is located on one end side in the longitudinal direction of the tube and forms an inlet side tank space (112) into which fluid flows from the outside;
An upstream channel plate (116) that forms an upstream channel (117) that guides the fluid flowing in from the inlet side tank space toward the other end in the tube longitudinal direction;
A U-turn plate portion (118) which is located on the other end side in the longitudinal direction of the tube and forms a U-turn space (119) into which a fluid flows from the upstream flow path;
A downstream side that forms a downstream side channel (121) that is arranged adjacent to the upstream side channel and parallel to the upstream channel and that guides the fluid flowing in from the U-turn space toward one end in the tube longitudinal direction. A flow path plate (120);
An outlet side tank plate portion (113) that is located at one end of the tube in the longitudinal direction of the tube and that forms an outlet side tank space (114) that allows the fluid to flow in from the downstream side flow path and outflow the fluid that has flowed to the outside;
An inter-channel rib (122, 122a, 122b) located between the upstream-side channel and the downstream-side channel and projecting from the first plate toward the second plate side;
The inner fin is
An upstream fin portion (21) located in the upstream flow path;
A downstream fin portion (22) located in the downstream flow path;
An interflow channel fin portion (23) located between the upstream fin portion and the downstream fin portion and sandwiched and joined between the interflow channel rib and the second plate,
The upstream fin portion, the downstream fin portion, and the inter-flow channel fin portion have the same fin pitch and the same cross-sectional shape in the direction orthogonal to the tube longitudinal direction,
The cross-sectional shape in the direction perpendicular to the tube longitudinal direction of the surface joined to the inner fin of the inter-flow rib is the tube longitudinal direction of the surface joined to the inter-flow channel rib of the inner fin. A heat exchanger having the same cross-sectional shape in a direction orthogonal to the above. The tube protrudes from the first plate toward the second plate, and a rib between the tanks (115) that separates the inlet-side tank space and the outlet-side tank space by joining a tip portion to the second plate. With
The inter-passage ribs are connected to the inter-tank ribs,
2. The heat exchanger according to claim 1, wherein the inter-channel fin portion is joined to the inter-channel rib and the second plate in a state of being in contact with the inter-tank rib.   The heat exchanger according to claim 1 or 2, wherein the tube includes a first stopper (115) that defines a movement range of the inner fin toward one end side in the tube longitudinal direction. The first stopper is connected to the rib between the flow paths,
The width W1 in the alignment direction of the upstream flow path and the downstream flow path in the first stopper is greater than the width W2 in the alignment direction of the upstream flow path and the downstream flow path in the inter-flow path rib. The heat exchanger according to claim 3, wherein the heat exchanger is also wide.   The heat exchanger according to any one of claims 1 to 4, wherein the tube includes a second stopper (123) that defines a movement range of the inner fin toward the other end side in the tube longitudinal direction. The second stopper is connected to the rib between the flow paths,
The width W3 in the arrangement direction of the upstream flow path and the downstream flow path in the second stopper is greater than the width W2 in the alignment direction of the upstream flow path and the downstream flow path in the inter-flow path rib. The heat exchanger according to claim 5, wherein the heat exchanger is also wide. The first plate includes an outer peripheral rib (124) that is formed on an outer peripheral edge of the first plate, protrudes toward the second plate, and is joined to the second plate.
The protrusion height (H1) of the rib between the flow paths is lower by the plate thickness (t) of the inner fin than the protrusion height (H2) of the outer peripheral rib. The heat exchanger according to any one of 6. The inter-channel ribs (122a, 122b) are divided into a plurality along the tube longitudinal direction,
Of the plurality of inter-flow-path ribs, the tank-side inter-flow-path rib (122a) positioned closest to the inlet-side tank space is connected to the inter-tank rib,
The heat exchanger according to claim 2, wherein the inter-channel fin portion is joined to the tank-side inter-channel rib.

Images