JP2019078484A - Heat exchanger - Google Patents

Abstract

To provide a heat exchanger which achieves a heat exchange performance and fuel consumption performance.SOLUTION: A heat exchanger 10 includes: a main fin 11 which conducts heat exchange between travel wind W and a heat transfer medium M; and leg parts 13 attached to a wind deflector 4 and supporting the main fin 11. A passage 14 in which the heat transfer medium M circulates is provided at the main fin 11. A front end part 11b is located above an upper part 2a of a cabin 2, and a rear end part 11c is located in front of a top part 4b of the wind deflector 4. A lower surface 11d of the main fin 11 includes a first wind guide surface 11w which curves in a recessed form and rectifies the travel wind W2 flowing upward from the cabin 2 to the rear side. The first wind guide surface 11w forms a first angle relative to a reference line extending in a fore and aft direction of a truck 1 at a front end and forms a second angle smaller than the first angle relative to the reference line at a rear end.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a heat exchanger.

  BACKGROUND ART Conventionally, as a technology related to a heat exchanger, for example, Patent Document 1 describes an automobile provided with an air spoiler having a wing extending in the vehicle width direction and a leg supporting the wing. In this car, the heat dissipation means is disposed below the wing.

JP 2001-93556 A

  In the above technical field, for example, in the arrangement of a heat exchanger in a truck, in order to achieve both heat exchange performance and fuel consumption performance, for example, a heat exchanger is disposed at a position where the flow velocity of air is high. It is desirable that the increase in

  This invention is made in view of the said situation, and makes it a subject to provide the heat exchanger which can aim at coexistence with heat exchange performance and fuel consumption performance.

  The heat exchanger according to the present invention is a heat exchanger provided in a vehicle having a wind guide member attached to the upper part of the cabin and guiding the traveling wind flowing above the cabin, and extends in the vehicle width direction of the vehicle A heat transfer medium is provided, and a fin for exchanging heat between the traveling wind and the heat transfer medium, a leg attached to the upper part of the cabin or the air guide member, and supporting the fin The front end of the fin is located above the top of the cabin, the rear end of the fin is forward of the top of the wind guide member, and the fin is on the cabin side with the front end and the rear end And an upper surface connecting the front end portion and the rear end portion on the opposite side of the cabin, and the lower surface is concavely curved to rectify the traveling wind directed upward from the cabin backward The first wind guiding surface includes the first wind guiding surface, and the first wind guiding surface has a front end None of the first angle with respect to a reference line extending in the longitudinal direction of the Oite vehicle, forms a smaller second angle than the first angle with respect to the reference line at the rear end.

  In this heat exchanger, heat is exchanged between the traveling wind and the heat transfer medium in the fins provided with the flow paths through which the heat transfer medium flows. In this fin, the front end of the fin is located above the upper part of the cabin, and the lower surface includes a first wind guiding surface that curves concavely and rectilinearly travels the air traveling upward from the cabin, so the upper part of the cabin The traveling wind flowing through is guided by the first wind guiding surface. Since the first wind guide surface forms a first angle at the front end with respect to a reference line extending in the longitudinal direction of the vehicle, the traveling wind directed upward from the cabin is guided by the first wind guide surface. The first air guiding surface has a second angle smaller than the first angle with respect to the reference line at the rear end, and the rear end of the fin is positioned forward of the top of the air guiding member. The traveling wind which has flowed along is rectified so as to approach the longitudinal direction of the vehicle by the traveling wind guided to the first air guiding surface. Thereby, for example, when the upper surface of the loading platform extends rearward from the top of the air guide member, the separation of the traveling wind on the upper surface of the loading platform is suppressed, and the air resistance can be reduced. In addition, the traveling wind flowing above the cabin has a higher flow velocity than the air flowing in, for example, an engine room or the like. This promotes heat exchange between the traveling wind and the heat transfer medium. Therefore, according to this heat exchanger, it is possible to achieve both the heat exchange performance and the fuel consumption performance.

  In the heat exchanger according to the present invention, the flow path has a first flow path for circulating the heat transfer medium, and a second flow path for circulating the heat transfer medium having flowed through the first flow path, The flow path may be disposed rearward of the second flow path in the front-rear direction. In this case, the temperature difference between the heat transfer medium of the first flow passage and the traveling air can be increased as compared to the case where the first flow passage is disposed forward of the second flow passage in the front-rear direction. Therefore, the heat exchange performance can be improved.

  In the heat exchanger according to the present invention, the leg portion is a pair of plate-like members disposed on both ends of the fin in the vehicle width direction, and the upper end portion of the leg portion is located above the upper surface Good. In this case, since the running air flowing along the upper surface is rectified by the legs disposed at both ends so as not to flow outward in the vehicle width direction more than the legs, the flow velocity of the traveling air flowing along the upper surface is increased. .

  In the heat exchanger according to the present invention, at least one of the upper surface and the lower surface of the fin may be provided with a plurality of protrusions. In this case, the projections disturb the air flow on the surface of the fin, thereby reducing the growth of the laminar boundary layer on the downstream side of the flow direction of the traveling air on the surface of the fin. Thereby, the separation of the traveling wind on the surface of the fin is suppressed, the rectification effect by the fin is easily maintained, and the growth of the laminar boundary layer on the surface of the fin is reduced, thereby improving the heat exchange performance in the fin. Do.

  In the heat exchanger according to the present invention, a flow path extending in the vehicle width direction and allowing the heat transfer medium to flow is provided, and the heat exchanger further includes auxiliary fins for exchanging heat between the traveling wind and the heat transfer medium, The auxiliary fin may be disposed between the fin and the cabin or the air guide member. In this case, since the auxiliary fins are disposed between the fins and the cabin or the air guide member, the traveling wind is more reliably guided by the fins and the auxiliary fins. Therefore, it is possible to rectify the traveling wind flowing along the wind guiding member so as to more reliably approach the longitudinal direction of the vehicle.

  In the heat exchanger according to the present invention, the auxiliary fin is a lower surface connecting the front end of the auxiliary fin and the rear end of the auxiliary fin on the cabin side, and the front end of the auxiliary fin and the rear end of the auxiliary fin on the fin side And a second air guiding surface having a convexly curved surface, and the second air guiding surface has a third end larger than a second angle with respect to the reference line at a rear end thereof. It may be at an angle. In this case, on the rear end side of the fin and the auxiliary fin, a space sandwiched by the first air guide surface of the fin and the second air guide surface of the auxiliary fin is narrowed. Therefore, the flow velocity of the traveling wind flowing between the first wind guiding surface and the second wind guiding surface is increased, and the operation and effect to rectify the traveling wind flowing along the wind guiding member so as to approach the longitudinal direction of the vehicle It is further enhanced.

  According to the present invention, it is possible to provide a heat exchanger capable of achieving both heat exchange performance and fuel efficiency performance.

FIG. 1 is a perspective view of a vehicle provided with a heat exchanger according to the embodiment. FIG. 2 (a) is a perspective view of the main fin of the heat exchanger of FIG. FIG. 2b is a perspective view of the auxiliary fin of the heat exchanger of FIG. FIG. 3 is a schematic side view of the vehicle of FIG. FIG. 4 is a schematic side view showing the first angle and the second angle of the first air guiding surface of the heat exchanger of FIG. 1 and the third angle of the second air guiding surface.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals and redundant description will be omitted. The X direction in each drawing indicates the front-rear direction of the track 1, the Y direction in each drawing indicates the vehicle width direction of the track 1, and the Z direction in each drawing is the track 1 It shows the up and down direction.

  FIG. 1 is a perspective view of a vehicle provided with a heat exchanger according to the embodiment. As shown in FIG. 1, the heat exchanger 10 according to the present embodiment is provided, for example, in a truck (vehicle) 1 having a wind deflector (air guide member) 4. The track 1 is, for example, a so-called aluminum van type. The vehicle to which the heat exchanger 10 is applied is not limited to the truck 1 and may be, for example, a trailer head for pulling a trailer carrying a cargo bed or a container.

  The truck 1 has a loading platform 3 disposed at the rear of the cabin 2 and a wind deflector 4 attached to an upper portion 2 a of the cabin 2. The loading platform 3 has, for example, a rectangular parallelepiped outer shape, and has an upper surface 3a, a front surface 3b, and a pair of side surfaces 3c. The upper surface 3 a of the loading platform 3 extends, for example, along the XY plane at a position higher than the position (height position) in the Z direction of the upper portion 2 a of the cabin 2.

  The wind deflector 4 guides the traveling air flowing above the cabin 2. The wind deflector 4 is provided so as to cover the upper portion 2 a of the cabin 2 and the front surface 3 b of the loading space 3. The front end 4 a of the wind deflector 4 is disposed along the front end 2 b of the upper portion 2 a of the cabin 2. The top 4 b of the wind deflector 4 is disposed near a corner 3 d which is a boundary between the top surface 3 a and the front surface 3 b of the loading platform 3. That is, the upper surface 3 a of the loading platform 3 extends rearward from the top 4 b of the wind deflector 4.

  The upper surface 4 c of the wind deflector 4 extends from the front end 4 a to the top 4 b so as to be continuous with the upper surface 3 a of the loading platform 3. The front end portion 4a side of the upper surface 4c has a predetermined width smaller than the width of the upper surface 3a of the loading platform 3 in the Y direction. The top 4 b side of the upper surface 4 c has a width equal to the upper surface 3 a of the loading platform 3 in the Y direction. The upper surface 4c is curved in a convex shape (for example, in an arc shape) so as to protrude on the opposite side of the cabin 2 when viewed from the Y direction, for example (see FIG. 4).

  The pair of side surfaces 4 d of the wind deflector 4 extends from the front end 4 a to the rear end 4 e so as to be continuous with the side surface 3 c of the load carrier 3. The pair of side surfaces 4 d extend away from each other in the Y direction as viewed from the Z direction, for example, from the front to the rear.

  The heat exchanger 10 is attached to the wind deflector 4 as an example. The heat exchanger 10 constitutes a part of a heat exchange device (for example, a cooling device such as a drive source, an air conditioner, and a waste heat recovery device, etc., not shown) mounted on the truck 1. The heat is exchanged between the traveling wind that the truck 1 receives when traveling and the heat transfer medium of the heat exchange device.

  The heat exchanger 10 includes a main fin (fin) 11 and an auxiliary fin 12, and a pair of legs 13 supporting the main fin 11 and the auxiliary fin 12. The main fins 11 and the auxiliary fins 12 extend in the Y direction (the vehicle width direction of the truck 1), and are arranged to extend in a direction intersecting the flow direction of the traveling wind. The main fin 11 and the auxiliary fin 12 are supported by the pair of leg portions 13 so that both end portions 11 a and 12 a in the Y direction are sandwiched. The auxiliary fins 12 are supported by the legs 13 below the main fins 11.

  The legs 13 are, for example, a pair of plate-like members disposed at both ends 11 a and 12 a of the main fin 11 and the auxiliary fin 12 in the Y direction. The leg 13 has a proximal end 13a attached to the wind deflector 4 and an extension 13b extending upward from the proximal end 13a. The base end 13 a is disposed, for example, at the boundary between the top surface 3 a and the side surface 4 d on the front end 4 a side of the wind deflector 4. For example, the extension 13b is substantially rectangular when viewed from the Y direction on the upper end 13c side, and extends upward from the base end 13a substantially in parallel with the ZX plane.

  FIG. 2A is a perspective view of main fins of the heat exchanger 10. FIG. 2B is a perspective view of the auxiliary fin of the heat exchanger 10.

  As shown in (a) of FIG. 2, the cross-sectional shape of the main fin 11 along the ZX plane is, for example, substantially wing-like. The main fin 11 has a lower surface 11d connecting the front end 11b and the rear end 11c on the cabin 2 side, and an upper surface 11e connecting the front end 11b and the rear end 11c on the opposite side of the cabin 2 ing. The lower surface 11 d includes a first air guiding surface 11 w which is curved in a concave shape and rectilinearly travels the traveling wind from the cabin 2 upward. The front end portion 11 b has an arc-shaped cross section in front of the main fin 11 as viewed from the Y direction. The rear end portion 11 c has an arc-shaped cross section seen from the Y direction at the rear of the main fin 11. The radius of the arc of the front end 11b is larger than the radius of the arc of the rear end 11c. As an example, the front end 11x of the first air guiding surface 11w corresponds to a portion where the arc shape of the front end 11b ends on the lower surface 11d side. The rear end 11y of the first air guiding surface 11w corresponds to a portion where the arc shape of the rear end 11c ends on the lower surface 11d side.

  As shown in (b) of FIG. 2, the auxiliary fin 12 is disposed between the main fin 11 and the wind deflector 4. The cross-sectional shape of the auxiliary fin 12 along the ZX plane is, for example, substantially wing-like. The auxiliary fin 12 has a lower surface 12d connecting the front end 12b and the rear end 12c on the cabin 2 side, and an upper surface 12e connecting the front end 12b and the rear end 12c on the main fin 11 side. There is. The upper surface 12 e includes a second air guiding surface 12 w curved in a convex shape. The front end 12 b has an arc-shaped cross section in front of the auxiliary fin 12 as viewed from the Y direction. The rear end portion 12 c has an arc-shaped cross section as viewed from the Y direction at the rear of the auxiliary fin 12. The radius of the arc of the front end 12b is larger than the radius of the arc of the rear end 12c. As an example, the front end 12x of the second air guide surface 12w corresponds to the portion where the arc shape of the front end 12b ends on the upper surface 12e side. The rear end 12y of the second air guide surface 12w corresponds to a portion where the arc shape of the rear end 12c ends on the upper surface 12e side.

  The auxiliary fins 12 here are smaller than the main fins 11. More specifically, the chord length (longitudinal length) of the auxiliary fin 12 in the cross section along the ZX plane is shorter than the chord length of the main fin 11 in the cross section along the ZX plane. The cross-sectional area of the auxiliary fin 12 along the ZX plane is smaller than the cross-sectional area of the main fin 11 along the ZX plane.

  FIG. 3 is a schematic side view of the vehicle of FIG. FIG. 4 is a schematic side view showing the first angle θ1 and the second angle θ2 of the first air guiding surface 11w of the heat exchanger 10 and the third angle θ3 of the second air guiding surface 12w. In FIG. 3, the leg 13 located on the left side of the track 1 is omitted for the sake of simplicity of explanation and illustration.

  As shown in FIG. 3 and FIG. 4, the main fins 11 and the auxiliary fins 12 further guide and rectify the traveling winds W1 to W3 in addition to the wind guiding action of the wind deflector 4, whereby the upper surface 3 a of the cargo bed 3 It arrange | positions by the positional relationship that it becomes possible to suppress peeling of the traveling wind W in.

  Specifically, as shown in FIG. 3, the front end 11 b of the main fin 11 is located above the upper portion 2 a of the cabin 2. The rear end 11 c of the main fin 11 is located forward of the top 4 b of the wind deflector 4. Therefore, the traveling wind W2 which has flowed upward by hitting the cabin 2 is caught by the main fins 11, and the traveling wind W2 is guided such that the flow direction of the traveling wind W2 changes in the direction along the X direction.

  The auxiliary fin 12 is disposed below the main fin 11, and the front end 12 b of the auxiliary fin 12 is located above the upper portion 2 a of the cabin 2. The rear end 12 c of the auxiliary fin 12 is located forward of the top of the wind deflector 4. The position of the rear end 12 c of the auxiliary fin 12 in the X direction is substantially the same as the position of the rear end 11 c of the main fin 11 in the X direction. The position of the rear end 12 c of the auxiliary fin 12 in the X direction may be located forward of the position of the rear end 11 c of the main fin 11 in the X direction.

  The upper end portion 13 c of the leg portion 13 is located above the upper surface 11 e of the main fin 11. Further, as described above, the pair of leg portions 13 is disposed so as to sandwich the both end portions 11 a of the main fin 11. Accordingly, the running air W1 flowing along the upper surface 11e is rectified by the legs 13 disposed at the both ends 11a so as not to flow outward in the vehicle width direction than the legs 13, and the traveling air W1 at the rear of the heat exchanger 10 Flow is less likely to be disturbed.

  Further, as shown in FIG. 4, the first air guiding surface 11w forms a first angle θ1 with respect to the reference line L extending in the X direction at the front end 11x, and with respect to the reference line L at the rear end 11y. The second angle θ2 is smaller than the angle θ1. More specifically, in the main fin 11, the tangent L1 at the front end 11x of the first air guiding surface 11w forms a first angle θ1 with respect to the reference line L. The tangent L2 at the rear end 11y of the first air guiding surface 11w forms a second angle θ2 smaller than the first angle θ1 with respect to the reference line L. Therefore, the traveling wind W2 guided by the first air guiding surface 11w is rectified so as to approach the X direction by the first air guiding surface 11w.

  The first angle θ1 and the second angle θ2 here are in a predetermined cross section of the main fin 11 in the ZX plane. That is, regarding the cross sections of the plurality of main fins 11 at different positions in the Y direction, the second angle θ2 in each cross section may be smaller than the first angle θ1 in the cross section. As long as this magnitude relationship is established, the first angles θ1 in the respective cross sections may be equal to one another or may be different from one another as compared with the first angle θ1 in the other cross sections. Similarly, the second angles θ2 in each cross section may be equal to one another or may be different from one another as compared to the second angles θ2 in the other cross sections.

  The second air guiding surface 12w forms a third angle θ3 larger than the second angle θ2 with respect to the reference line L at the rear end 12y. More specifically, in the auxiliary fin 12, the tangent L3 at the rear end 12y of the second air guiding surface 12w forms a third angle θ3 larger than the second angle θ2 with respect to the reference line L. Therefore, the space between the first air guiding surface 11w and the second air guiding surface 12w is narrowed at the rear end 11c and the rear end 12c, so the first air guiding surface 11w and the second air guiding surface 12w. The flow velocity of the traveling wind W2 flowing between is increased.

  Incidentally, a tangent L4 at the front end 12x of the second air guiding surface 12w forms a fourth angle θ4 equivalent to the first angle θ1 with respect to the reference line L. The fourth angle θ4 may be smaller than the first angle θ1. Therefore, the traveling wind W2 flowing above the cabin 2 is more reliably introduced between the first air guiding surface 11w and the second air guiding surface 12w.

  The first angle θ1 to the fourth angle θ4 here are in a predetermined cross section in the ZX plane of the main fin 11. That is, for the cross sections of the plurality of main fins 11 at different positions in the Y direction, the third angle θ3 in each cross section may have a magnitude relationship larger than the second angle θ2. As long as this magnitude relationship is established, the first angles θ1 in the respective cross sections may be equal to one another or may be different from one another as compared with the first angle θ1 in the other cross sections. Similarly, the second angles θ2 in each cross section may be equal to one another or may be different from one another as compared to the second angles θ2 in the other cross sections. Similarly, the third angle θ3 in each cross section may be equal to or different from each other as compared to the third angle θ3 in the other cross sections.

  As shown in FIG. 2 and FIG. 3, a plurality of flow paths 14 are provided inside the main fin 11 and the auxiliary fin 12. The flow path 14 is, for example, a through hole that forms a space through which the heat transfer medium M flows. The flow path 14 is formed to extend, for example, linearly along the extension direction of the main fin 11 and the auxiliary fin 12. The plurality of flow channels 14 are arranged in a row along the chord direction of the wing shape of the main fin 11 and the auxiliary fin 12 along the ZX plane. The plurality of flow paths 14 are substantially parallel to each other in the Y direction.

  In the example of FIG. 2, five flow paths 14 are formed in the main fin 11, and three flow paths 14 are formed in the auxiliary fin 12. The main fin 11 exchanges heat between the traveling wind W flowing around the main fin 11 and the heat transfer medium M flowing in the flow path 14 of the main fin 11. The auxiliary fins 12 exchange heat between the traveling wind W flowing around them and the heat transfer medium M flowing in the flow path 14 of the auxiliary fins 12. The main fin 11 and the auxiliary fin 12 are made of, for example, metal or the like.

  The flow path 14 has a first flow path 14 a and a second flow path 14 b for circulating the heat transfer medium M flowing in the first flow path 14 a. The first flow passage 14a is disposed rearward of the second flow passage 14b in the front-rear direction. In the example of FIG. 2, of the five channels 14 formed in the main fin 11, two channels 14 on the front side (the direction indicated by the arrow in the X direction) are used as the second channels 14 b, and the rear side The three flow paths 14 are the first flow paths 14 a. Further, in the auxiliary fin 12, one of the three flow paths 14 in the front is set as the second flow path 14b, and the two rear flow paths 14 are set as the first flow path 14a. There is. The flow path 14 is connected to, for example, a flow path (see FIG. 3) provided inside the leg portion 13, and between the heat exchange device mounted on the track 1 and the flow path 14, the flow path The heat transfer medium M can be circulated through the

  A plurality of projections 15 are provided on the upper surface 11e of the main fin 11. In the example of FIG. 2A, the plurality of projections 15 are provided on the front end 11b side of the upper surface 11e. The plurality of projections 15 are provided, for example, at the end portion 11 f where the arc shape of the front end portion 11 b ends on the lower surface 11 d. The plurality of protrusions 15 are spaced apart from each other by a predetermined distance in the Y direction. The shape of the protrusion 15 is not particularly limited, but is, for example, cylindrical. These protrusions 15 function as a so-called vortex generator that intentionally disturbs the air flow on the upper surface 11 e. Thus, the growth of the laminar boundary layer on the downstream side in the flow direction of the traveling wind W on the upper surface 11 e is reduced.

  Similarly, as shown in (b) of FIG. 2, the plurality of protrusions 15 are provided on the upper surface 12 e of the auxiliary fin 12. In the example of (b) of FIG. It is provided on the front end 12b side of the upper surface 12e. The plurality of protrusions 15 are provided, for example, at the end 12f where the arc shape of the front end 12b ends on the upper surface 12e. The arrangement and shape of the projections 15 may be the same as or different from the projections 15 provided on the main fin 11. By disturbing the air flow on the upper surface 12 e by these protrusions 15, the growth of the laminar boundary layer on the downstream side in the flow direction of the traveling wind W on the upper surface 12 e is reduced.

  In the heat exchanger 10 configured as described above, as shown in FIG. 3, the heat transfer medium M that has been flowed from the heat exchange device by the pump (not shown) of the heat exchange device mounted on the track 1. Are circulated in the first flow passage 14a. The heat transfer medium M circulated in the first flow passage 14a and heat-exchanged with the traveling wind W is circulated in the second flow passage 14b. The heat transfer medium M circulated in the second flow path 14 b and heat-exchanged with the traveling wind W flows toward the heat exchange device. Thus, the temperature difference between the heat transfer medium M and the traveling wind W in the first flow passage 14a is larger than in the case where the first flow passage 14a is disposed in front of the second flow passage 14b.

  Further, as shown by the two-dot chain line in FIG. 3, in the heat exchanger 10, the main fins 11 and the auxiliary fins 12 flow toward the front surface 3 b of the loading platform 3 above the cabin 2 when the truck 1 travels. Wind is directed to flow W 1 to W 3 along the upper surface 3 a of the loading platform 3. Therefore, the traveling wind W3 flowing along the wind deflector 4 is pressed downward by the traveling wind W2 guided to the first air guiding surface 11w, so that the flow direction of the traveling wind W3 is along the X direction. Will be rectified. As a result, the separation of the traveling wind W on the upper surface 3 a of the loading platform 3 is suppressed.

  As described above, in the heat exchanger 10, heat is exchanged between the traveling wind W and the heat transfer medium M in the main fin 11 provided with the flow path 14 through which the heat transfer medium M flows. . In the main fin 11, the front end 11b of the main fin 11 is positioned above the upper portion 2a of the cabin 2, and is concavely curved to rectify the traveling wind W2 directed upward from the cabin 2 rearwardly, the first air guiding surface Since the lower surface 11d includes 11w, the traveling wind W2 flowing above the cabin 2 is guided by the first wind guiding surface 11w. Since the first wind guiding surface 11w forms a first angle θ1 with the reference line L extending in the X direction at the front end 11x, the traveling wind W2 directed upward from the cabin 2 is guided by the first wind guiding surface 11w. The first air guiding surface 11w forms a second angle θ2 smaller than the first angle θ1 with respect to the reference line L at the rear end 11y, and the rear end 11c of the main fin 11 is forward of the top 4b of the wind deflector 4 The traveling wind W3 flowing along the wind deflector 4 is rectified to approach the X direction by the traveling wind W2 guided to the first air guiding surface 11w. Thereby, the separation of the traveling wind W on the top surface 3a of the bed 3 extending rearward from the top 4b of the wind deflector 4 is suppressed, and the air resistance can be reduced. Further, the traveling winds W1 to W3 flowing above the cabin 2 have a flow velocity faster than, for example, an air flow flowing in an engine room or the like. Thereby, heat exchange between the traveling winds W1 to W3 and the heat transfer medium M is promoted. Therefore, according to the heat exchanger 10, it is possible to achieve both the heat exchange performance and the fuel consumption performance.

  In the heat exchanger 10, the flow path 14 has a first flow path 14a for circulating the heat transfer medium M, and a second flow path 14b for circulating the heat transfer medium M flowing through the first flow path 14a. The first flow passage 14a is disposed rearward of the second flow passage 14b in the front-rear direction. Thereby, the temperature difference between the heat transfer medium M of the first flow passage 14a and the traveling wind W is large as compared with the case where the first flow passage 14a is disposed forward of the second flow passage 14b in the front-rear direction. can do. Therefore, the heat exchange performance can be improved.

  In the heat exchanger 10, the legs 13 are a pair of plate-like members disposed at both ends 11a of the main fin 11 in the Y direction. The upper end 13c of the leg 13 is located above the upper surface 11e. As a result, the running air W1 flowing along the upper surface 11e is rectified by the legs 13 arranged at the both ends 11a so as not to flow outward in the vehicle width direction than the legs 13, so that the traveling flows along the upper surface 11e The velocity of the wind W1 is increased.

  In the heat exchanger 10, a plurality of protrusions 15 are provided on the upper surface 11 e of the main fin 11 and the upper surface 12 e of the auxiliary fin 12. By disrupting the air flow on the upper surface 11 e and the upper surface 12 e by these projections 15, the growth of the laminar boundary layer on the downstream side in the flow direction of the traveling wind W on the upper surface 11 e and the upper surface 12 e is reduced. Thereby, the separation of the traveling wind W on the upper surface 11 e and the upper surface 12 e is suppressed, the rectification effect by the main fin 11 and the auxiliary fin 12 is easily maintained, and the growth of the laminar boundary layer on the surface of the main fin 11 and the auxiliary fin 12 As a result, the heat exchange performance of the main fin 11 and the auxiliary fin 12 is improved.

  Heat exchanger 10 is provided with a channel 14 extending in the Y direction and allowing heat transfer medium M to flow therethrough, and further includes auxiliary fins 12 for exchanging heat between traveling wind W and heat transfer medium M. ing. The auxiliary fin 12 is disposed between the main fin 11 and the cabin 2 or the wind deflector 4. Since the auxiliary fin 12 is disposed between the main fin 11 and the cabin 2 or the wind deflector 4, the traveling wind W2 is more reliably guided by the main fin 11 and the auxiliary fin 12. Therefore, the traveling wind W3 flowing along the wind deflector 4 can be rectified so as to approach the X direction more reliably.

  In the heat exchanger 10, the auxiliary fin 12 is a lower surface 12d connecting the front end 12b and the rear end 12c on the cabin 2 side, and an upper surface 12e connecting the front end 12b and the rear end 12c on the main fin 11 side. And. The upper surface 12 e includes a second air guiding surface 12 w curved in a convex shape. The second air guiding surface 12w forms a third angle θ3 larger than the second angle θ2 with respect to the reference line L at the rear end 12y. As a result, on the side of the rear end 11c and the rear end 12c, the space sandwiched between the first air guiding surface 11w and the second air guiding surface 12w is narrowed. Therefore, the flow velocity of the traveling wind W2 flowing between the first air guiding surface 11w and the second air guiding surface 12w is increased, and the operation to rectify the traveling air W3 flowing along the wind deflector 4 so as to approach the X direction. The effect is further enhanced.

  As mentioned above, although the suitable embodiment concerning the present invention was described, the present invention is not limited to the above-mentioned embodiment.

  For example, although the leg 13 is attached to the wind deflector 4 in the heat exchanger 10 of the above embodiment, the leg 13 may be attached directly to the upper portion 2 a of the cabin 2.

  Although the one main fin 11 and the one auxiliary fin 12 were illustrated as a fin of the heat exchanger 10 in the said embodiment, the kind and number of fins are not limited to this example. For example, in the heat exchanger 10, two or more main fins 11 may be provided, two or more auxiliary fins 12 may be provided, or the auxiliary fins 12 may be omitted.

  In the said embodiment, although the cross section of the main fin 11 and the auxiliary fin 12 was wing shape of uniform shape in the Y direction, the cross-sectional shape of a fin is not limited to this example. For example, the shape may be changed in the Y direction, or the shape may be a simple plate shape having a uniform thickness. Further, in the main fin 11, the upper surface 11e may have a shape (for example, a rectangular cross-sectional shape) that does not have a wind guiding function. In addition, in the auxiliary fin 12, the lower surface 12d may have a shape that does not have a wind guiding function.

  In the above embodiment, the leg portion 13 is disposed at both ends 11a and 12a of the main fin 11 and the auxiliary fin 12 in the Y direction, but the central portion of the main fin 11 and the auxiliary fin 12 is more than the both ends 11a and 12a. It may be disposed at a position closer to it. The point is that the leg portion 13 may be disposed on the both end portions 11a and 12a side.

  In the above embodiment, the extension 13b of the leg 13 extends parallel to the ZX plane, but may extend at an angle to the ZX plane. For example, the extending portions 13b may extend closer to each other as it goes from the lower side to the upper side, as viewed in the X direction. In this case, it is possible to reduce the force that the heat exchanger 10 receives when the extension portion 13 b receives a cross wind.

  In the above embodiment, the extension 13b of the leg 13 is substantially rectangular when viewed from the Y direction on the upper end 13c side, but the shape of the extension 13b is not limited thereto, and at least the main fin Various shapes can be adopted as long as 11 can be supported.

  In the above embodiment, the flow path 14 through which the heat transfer medium M flows is provided inside the main fin 11 and the auxiliary fin 12, but may be provided on the surface of the main fin 11 and the auxiliary fin 12 .

  In the above embodiment, the plurality of protrusions 15 are provided on the main fin 11 on the front end portion 11b side of the upper surface 11e, but may be provided on another position of the upper surface 11e. The plurality of projections 15 are provided on the front end 12b side of the upper surface 12e in the auxiliary fin 12, but may be provided on another position of the upper surface 12e.

  In the main fin 11 of the above embodiment, the plurality of projections 15 are provided only on the upper surface 11 e, but may be further provided on the lower surface 11 d or may be provided only on the lower surface 11 d. That is, the plurality of protrusions 15 may be provided on at least one of the upper surface 11 e and the lower surface 11 d of the main fin 11.

  In the auxiliary fin 12 of the above embodiment, the plurality of protrusions 15 are provided only on the upper surface 12 e, but may be further provided on the lower surface 12 d or may be provided only on the lower surface 12 d. That is, the plurality of protrusions 15 may be provided on at least one of the upper surface 12 e and the lower surface 12 d of the auxiliary fin 12.

  DESCRIPTION OF SYMBOLS 1 ... Truck (vehicle), 2 ... cabin, 2a ... upper part, 3 ... loading platform, 4 ... wind deflector (wind guide member), 4b ... top part, 10 ... heat exchanger, 11 ... main fin (fin), 11a, 12a ... both ends, 11 d ... lower surface, 11 e ... upper surface, 11 w ... first air guiding surface, 12 ... auxiliary fin, 12 d ... lower surface, 12 e ... upper surface, 12 w ... second air guiding surface, 13 ... legs, 14 ... flow path 14a: first flow path, 14b: second flow path, 15: projection, L: reference line, M: heat transfer medium, W, W1 to W3: traveling wind, θ1: first angle, θ2: second angle , Θ3 ... third angle.

Claims (6)

A heat exchanger provided in a vehicle having a wind guide member attached to an upper portion of a cabin and guiding a traveling wind flowing above the cabin, the heat exchanger being provided.
A fin extending in the vehicle width direction of the vehicle and having a flow passage through which the heat transfer medium is circulated, the fins exchanging heat between the traveling wind and the heat transfer medium;
A leg attached to an upper portion of the cabin or the air guide member and supporting the fin;
Equipped with
The front end of the fin is located above the top of the cabin,
The rear end of the fin is located forward of the top of the air guide member,
The fin has a lower surface connecting the front end and the rear end on the cabin side, and an upper surface connecting the front end and the rear end on the opposite side of the cabin.
The lower surface includes a first air guiding surface that is concavely curved to rectify a traveling air traveling upward from the cabin backward.
The first air guide surface forms a first angle at a front end with respect to a reference line extending in the front-rear direction of the vehicle, and forms a second angle at a rear end with respect to the reference line at a rear angle smaller than the first angle. Heat exchanger. The flow path has a first flow path for circulating the heat transfer medium, and a second flow path for circulating the heat transfer medium flowing through the first flow path,
The heat exchanger according to claim 1, wherein the first flow passage is disposed rearward of the second flow passage in the front-rear direction. The leg portion is a pair of plate-like members disposed on both ends of the fin in the vehicle width direction,
The heat exchanger according to claim 1, wherein an upper end portion of the leg portion is positioned above the upper surface.   The heat exchanger according to any one of claims 1 to 3, wherein a plurality of protrusions are provided on at least one of the upper surface and the lower surface of the fin. A flow path is provided, which extends in the vehicle width direction and through which the heat transfer medium flows, and further comprising auxiliary fins for exchanging heat between the traveling wind and the heat transfer medium,
The heat exchanger according to any one of claims 1 to 4, wherein the auxiliary fin is disposed between the fin and the cabin or the air guide member. The auxiliary fin is a lower surface connecting the front end of the auxiliary fin and the rear end of the auxiliary fin on the cabin side, and the front end of the auxiliary fin and the rear end of the auxiliary fin on the fin side And an upper surface to be connected,
The upper surface includes a second air guiding surface curved in a convex shape,
The heat exchanger according to claim 5, wherein the second air guide surface forms a third angle larger than the second angle with respect to the reference line at the rear end.

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