JP2007298201A - Heat exchanger, processing equipment, and method of manufacturing heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger reduced in flow channel resistance at an opening end of a tube. <P>SOLUTION: A flat tube 2 comprises right and left combined portions 11 as partitioning walls at a center, and tube joining portions 12 formed by bending tips of the combined portions. The opening end 2d of the tube is expanded in the thickness direction while inhibiting deformation of the combined portions 11, thus the tube joining portions are deformed in such manner that an opening angle of the tube joining portions is gradually reduced from 180° in a contact state with a tube inner face 14, and a straight wall 15 is formed by making the opening angle 0° at the tube opening end. Thus the tube joining portions can be deformed along the tube inner face while kept into contact therewith, and the increase and decrease of flow channel resistance can be controlled by preventing the fluid flow from being disordered. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger, a processing apparatus for manufacturing the heat exchanger, and a method for manufacturing the heat exchanger.

  Conventionally, there is a heat exchanger in which a core portion is formed by inserting an end portion of a tube having a fluid passage in a longitudinal direction into a core plate (see, for example, Patent Documents 1 and 2).

  In such a heat exchanger, there is a demand for reducing the decrease in fluid flow rate by reducing the flow resistance of the fluid at the tube end, thereby increasing the heat exchange efficiency at the core.

Therefore, when providing a partition wall for forming a fluid passage in the tube, the shape of this partition wall is devised, and furthermore, the opening at the end of the tube protruding from the core plate is expanded. It is conceivable to increase the road area.
Japanese Utility Model Publication No. 54-90750 JP 2000-158070 A

  However, in the above prior art, no measures have been taken to reduce the channel resistance at the opening of the tube, and there is room for improvement.

  An object of this invention is to provide the heat exchanger which made flow path resistance small in the opening end of a tube in view of the said point.

  In order to achieve the above object, according to the present invention, the left and right combination parts (11) are brought into contact with each other at the intermediate part in the width direction by bending the plate in one direction, and the tube on the front end side in the width direction of the combination part (11). The end (2b) in the longitudinal direction of the tube (2) formed so that the surface of the joint (12) faces the tube inner surface (14) is inserted into the tube insertion hole (5e) of the core plate (5a). In the heat exchanger (1) in which the tube (2) and the core plate (5a) are joined in the insertion hole (5e), the joining position of the outer periphery of the tube end (2b) and the tube insertion hole (5e) Further, at the portion up to the tip of the tube end (2b), the opening angle (θ) formed by each surface on the surface side of the left and right tube joints (12) is reduced according to the distance from the joint position. It is characterized by being.

  The opening angle (θ) of the tube joint portion (12) at the tube end portion (2b) is smaller than the opening angle of the tube joint portion (12) in the most range in the longitudinal direction of the tube (2). be able to. Further, in addition to or instead of this, the opening angle (θ) of the tube joint (12) at the tube end (2b) is determined from the joint position between the tube (2) and the core plate (5a). It is possible to adopt a configuration that gradually decreases with distance.

  Thereby, in the tube end part (2b) in which the opening is formed, the opening angle (θ) of the tube joint part (12) decreases so as to approach the tube opening end (2d). Since the shape change is formed, smooth inflow and outflow of the fluid at the opening end (2d) can be realized, and an increase in the channel resistance can be suppressed.

  The opening end (θ) of the end portion in the longitudinal direction of the combination portion (11) and the end portion in the longitudinal direction of the tube joint portion (12) in the vicinity of the tube end portion (2b) is approximately 0 °. It is possible to form a straight wall (15) that forms the same straight line in the direction intersecting the direction. Thereby, the flow-path resistance in the longitudinal direction edge part (2b) of a tube (2) can be made small. The straight wall (15) can be perpendicular to the tube inner surface (14).

  Alternatively, the opening angle (θ) of the left and right tube joints (12) can be formed to be less than 180 degrees at the longitudinal end (2b) of the tube (2). Moreover, in the longitudinal direction edge part (2b) of a tube (2), it can form so that a part of surface of the left-right combination part (11) may mutually space apart.

  Since these are deformed so that the opening angle (θ) of the surfaces of the left and right tube joint portions (12) is increased according to the distance from the open end (2d) of the tube (2), the tube (2) It is possible to suppress an increase in flow path resistance when the fluid flows into and out of the fluid.

  In addition, if the deformation | transformation of a tube junction part (12) is made to change gradually toward a tube opening end (2d) from a joining position, the fluid flow along a tube junction part (12) will be smoother, and a disorder | damage | failure will be carried out. Generation | occurrence | production can be suppressed and the raise of the flow-path resistance in the inflow and outflow of the fluid to a tube (2) can be suppressed.

  Further, at least a part of the tube joining portion (12) can be deformed so as to come into contact with the tube inner surface (14) from the joining position to an intermediate position between the joining position and the tube opening end (2d). Thereby, the flow resistance at the open end (2d) of the tube is maintained while the adhesion between the tube (2) and the core plate (5a) is maintained by the contact between the tube joint (12) and the tube inner surface (14). Can be reduced.

  If the tube joint (12) is in contact with the tube inner surface (14) according to the deformation of the tube joint (12) from the intermediate position toward the tube opening end (2d), the tube The adhesion between (2) and the core plate (5a) can be further improved.

  In addition, the tube (2) is symmetrical with respect to the center in the width direction, that is, the combination part (11) and the tube joint part (12) are arranged symmetrically at the width direction center of the tube (2). Thereby, the fluidity | liquidity in the fluid channel | path (2c) of a tube (2) and the workability | operativity of a heat exchanger assembly can be improved.

  In order to achieve the above object, the present invention includes a tube (2) and a core plate (5a) having a tube insertion hole (5e) into which the tube (2) is inserted, and the tube (2) is flat. Two side walls (2a) defining a cross section, two partition walls (11) extending in parallel from one side wall (2a) to the other side wall (2a), and two partition walls (11) to the other side wall Two joints (12) extending along the side wall (2a) and joined to the inner surface (14) of the other side wall (2a), the two side walls (2a) of the tube (2) Extending in parallel in a major part of the longitudinal direction to form a parallel part, the end part (2b) inserted into the core plate (5a) is inclined so as to be separated from each other and the widening part (2e) The two joint portions (12) are parallel portions. And extending along the other side wall (2a) with a predetermined first width and extending along the other side wall (2a) with a second width smaller than the first width at the widened portion (2e). Adopt a technical means called heat exchanger.

  According to this configuration, since the width of the two joint portions (12) extending along the side wall (2a) is reduced in the widened portion (2e), the flow of the heat exchange medium by the two joint portions (12). Disturbance is suppressed.

  Here, the two joint portions (12) can be joined to the other side wall (2a) directly or indirectly through another plate member. Also, the two joints (12) can be provided in a bilaterally symmetric shape that can be referred to as an L shape or a J shape. Two joining parts (12) can be made into the shape extended in parallel with the other side wall (2a) in the parallel part of a tube (2). The two joint portions (12) can be provided in the widened portion (2e) as a shape along the extension of the two partition walls (11) or a shape extending obliquely from the two partition walls (11). According to these structures, since the surface which spreads with the angle close | similar to two partition walls (11) rather than the shape along the other side wall (2a) is provided, the disturbance of a flow is suppressed. The two partition walls (11) and the two joint portions (12) have an L-shape and an L-shape that are arranged symmetrically in the parallel portion, or an L-shape that is arranged in an overlapping manner. Can be provided. An angle formed by the two joint portions (12) with respect to the two partition walls (11) in the widened portion (2e) is formed to be smaller than the angle in the parallel portion. Moreover, the plate material located on the extension of the two joint portions (12) in the parallel portion can form two partition walls (11) in the widened portion (2e). The flat cross-section of the tube (2) can be defined by two curved end walls connecting their ends in addition to the two side walls (2a).

  The present invention also includes a left and right combination part (11) formed in the center in the width direction so as to extend in the thickness direction intersecting the width direction and in contact with each other in the width direction. 11) A process for expanding the open end (2d) of the tube (2) including the tube joint portions (12) formed so as to face the tube inner surface (14) by being bent in opposite directions. In the device (30), a passage fitting portion (34) and a taper portion (36) are formed in this order from the distal end side in the longitudinal direction corresponding to the formation direction of the fluid passage (2c) included in the tube (2). And a slit (37) through which the passage fitting portion (34) and the taper portion (36) pass through the combined portion (11) of the tube (2) in the central portion in the width direction intersecting the longitudinal direction. And slit ( 7) provided with insertion portions (31) provided in the longitudinal direction with concave grooves (38) for passing the tube joint portion (12) of the tube (2) on both sides of the tube (2). Further, the taper portion (36) is connected to the passage fitting portion (34) so as to be slidably fitted to the inner periphery of the fluid passage (2c) when inserted into the fluid passage (2c). (35) has the same cross-sectional shape as the passage fitting portion (34), and is formed so that the distance in the thickness direction intersecting the width direction gradually increases according to the distance from the tip in the longitudinal direction. The second feature.

  The insertion end (31) of this processing apparatus has an opening end (2d) of the tube (2) provided with the combination portion (11) and the tube joint portion (12) with the passage fitting portion (34) at the tip side. The tube opening end (2d) is further inserted into the fluid opening (2c), and further, the tapered portion (36) formed by connecting to the passage fitting portion (34) is inserted into the tube opening end (2d). The taper portion (36) is deformed so that at least the distance in the thickness direction intersecting the width direction gradually increases in accordance with the flow direction position of the fluid passage (2c).

  At this time, since the position in the thickness direction of the tube joining portion (12) is constrained by the concave grooves (38) on both sides of the slit of the processing device (30), the tube end portion (2b) is expanded in the thickness direction. Accordingly, the opening angle (θ) of the left and right tube joints (12) is deformed so as to be gradually reduced. As a result, the tube joining portion (12) gradually deforms in the range expanded by the taper portion (36) of the processing device (30) in the vicinity of the tube end portion (2b), and fluid flows from the tube opening end (2d). A tube (2) can be formed to smoothly flow fluid into and out of the passage (2c).

  Moreover, since the tube end (2b) is expanded, the area of the open end (2d) of the tube (2) can be increased, thereby suppressing the flow resistance at the tube open end (2d). Can do.

  Furthermore, adhesion of the tube (2) and the core plate (5a) into which the tube (2) is inserted can be improved by expanding the tube end (2b).

  Furthermore, if the length in the width direction of the taper portion (36) is formed so as to gradually increase according to the distance from the tip, it can be expanded over the entire circumference of the tube end portion (2b).

  As a more specific configuration of the processing device (30), the distal end side of the passage fitting portion (34) is gradually smaller than the cross-sectional area of the passage fitting portion (34) according to the distance in the distal direction. A tip end portion (33) having a cross-sectional area is formed, and a parallel enlarged portion (41) is formed in the longitudinal direction from a position where the increase amount of the cross-sectional area of the taper portion (36) opposite to the tip end side is zero. be able to. In addition, a slit (37) and a concave groove (38) can be formed in at least a part of the parallel enlarged portion (41).

  In the present invention, an L-shaped and an inverted L-shaped foot (12) is formed at each end of the plate material, and the opening angle (θ) between the feet (12) is approximately 180 °. The step of forming the tube (2) in parallel with the inner surface and passing the longitudinal end (2b) of the tube (2) through the plurality of tube insertion holes (5e) provided in the core plate (5a) By placing the core plate (5a) on the tube (2) and inserting the processing device (30) into the tube end (2b) protruding from the core plate (5a), the tube end (2b) A step of deforming the foot (12) so that the opening angle (θ) of the foot (12) decreases toward the tip of the tube (2), and a core plate (2e) Each tube (2) and tube fixed by 5a) A step of brazing the fin core portion consisting of (3) (4) between the blanking, characterized in that to produce the heat exchanger (1).

  Thereby, before the brazing step, the tube end (2b) is expanded to fix the tube (2) to the core plate (5a) and to suppress the tube resistance. The deformation of the foot (12) in the portion (2b) can be performed simultaneously.

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

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. In the first embodiment, the heat exchanger according to the present invention is applied to a radiator 1 that exchanges heat between engine coolant (heat medium) that cools a vehicle engine and the atmosphere (air). FIG. 1 is a front view of a radiator 1 according to the first embodiment, and FIG. 2 is an enlarged cross-sectional view showing a main part of the first embodiment. FIG. 3 is a diagram showing a CC cross section of FIG.

  The tube 2 is a tube in which two fluid passages 2c for flowing engine cooling water through the combination portion 11 as a partition wall or a partition wall are formed. The tube 2 is formed in a flat shape so that the air flow direction (perpendicular to the plane of the paper) coincides with the major axis direction, and in the horizontal direction so that the longitudinal direction thereof coincides with the vertical direction (the vertical direction on the plane of the paper). A plurality of them are arranged in parallel.

  Further, wave-shaped fins 3 are joined to the flat surfaces 2a (see FIG. 2) on both sides of the tube 2 in the thickness direction. The fins 3 increase the heat transfer area with the air and the engine cooling water. Promotes heat exchange with air.

  Ends 2b (upper and lower ends in the present embodiment) on both sides in the longitudinal direction of the tube 2 are inserted into tube insertion holes 5e provided in the core plate 5a, and from the opening end 2d to the joining position near the tube insertion hole 5e. As described later, it is joined to the core plate 5a in an expanded state. Thereby, each tube 2 is being fixed to the core plate 5a. Here, when the substantially rectangular heat exchange part composed of the tube 2 and the fin 3 is referred to as a core part 4, the core plate 5 a serves as a fixed frame of the core part 4.

  Header tanks 5 are respectively provided on the upper and lower ends of the core portion 4. The header tank 5 includes a core plate 5a into which the tube 2 is inserted and joined, and a tank main body 5b that forms a tank internal space together with the core plate 5a. In the embodiment, it extends in the horizontal direction) and communicates with the plurality of tubes 2.

  In the first embodiment, the core plate 5a is made of metal (for example, aluminum alloy), and the tank body 5b is made of resin.

  Further, as shown in FIG. 2, a packing (not shown) made of an elastic material such as rubber is disposed in a concave groove 5c provided on the entire periphery of the edge of the core plate 5a, and the tank body 5b is formed by this packing. And the core plate 5a are hermetically sealed. A claw portion 5d is erected on the peripheral edge of the core plate 5a. The tank main body 5b is assembled to the core plate 5a by caulking and fixing the claw portion 5d to a flange formed on the outer peripheral edge of the tank main body 5b. It has been.

  At both ends in the horizontal direction of the core part 4, inserts 6 that extend substantially parallel to the longitudinal direction of the tube 2 and reinforce the core part 4 are provided. In FIG. 1, the cooling water inlet 7a is connected to the engine cooling water outlet side of the engine, and the cooling water outlet 7b is connected to the engine cooling water inlet side of the engine. As a result, as indicated by the arrows in FIG. 1, the engine cooling water flowing into the upper header tank 5 is distributed to a large number of tubes 2, resulting in a large flow velocity, and downward in the fluid passages 2 c in each tube 2. It flows and is collected in the lower header tank 5. Then, the engine coolant collected in the header tank 5 flows out from the coolant outlet 7b to the engine side.

  The pin 8 is a projecting member for assembling the radiator 1 to the vehicle body side, that is, a carrier (radiator support or front end panel) (not shown), the cap 9 is a pressure-type radiator cap, and the plug 10 is connected to the radiator 1. A plug for closing a drain port for draining engine cooling water.

  Next, the shape of the end portion 2b of the expanded tube 2 that is a characteristic point of the first embodiment will be described. 4A to 4C are views showing the AA cross section or the BB cross section in FIG. 3 of the tube end portion 2b. In each figure, a gap is drawn in the parallel part of the left and right combination part 11 in the direction perpendicular to the paper surface, but this part is actually brazed with a brazing material. The contact surface between the tube joint 12 and the tube inner surface 14 is also brazed.

  4A is a cross section of a portion where the fluid passage 2c is formed with the same cross-sectional shape in the longitudinal direction below the core plate 5a in FIG. Moreover, the BB cross section of FIG.4 (c) is a cross section of the site | part vicinity of the tube opening end 2d which has protruded from the core plate 5a of the tube end part 2b to the edge part side. FIG. 5 is a schematic perspective view seen from the open end 2d of the tube 2 that has been widened.

  Here, the shape of the tube 2 will be described. For example, as is well known from Japanese Patent Application Laid-Open No. 2000-158070, etc., both end portions in the width direction of an aluminum metal plate are continuous over the longitudinal direction intersecting the width direction, respectively, as the back surface of the metal plate. The left and right combined portions 11 are formed on the tube inner surface 14 side by being bent substantially vertically. Further, the left and right tube joint portions 12 are formed by bending the respective end portions of the left and right combination portions 11 further to the tube inner surface 14 side continuously in the longitudinal direction at substantially right angles. Then, the left and right ends of the metal plate on which the combination portion 11 and the tube joint portion 12 are formed are bent toward the tube inner surface 14 side, that is, with the opposite surface 13 side as the outer side, and at the intermediate portion in the width direction. The surfaces on the surface 13 side of the left and right combination portions 11 are in contact with each other over the longitudinal direction, and the surfaces on the surface 13 side of the left and right tube joint portions 12 are in contact with the tube inner surface 14.

  In this way, the AA cross section shown in FIG. 4A is formed in substantially the same shape over the longitudinal direction between the open ends 2 d on both sides of the tube 2. In the AA cross section, the opening angle θ formed by the left and right tube joint portions 12 is approximately 180 °, and the surface 12a on the surface side of the tube joint portion 12 is in contact with the tube inner surface 14. On the other hand, in the BB cross section shown in FIG. 4 (c), an enlarged portion 2e having a position X1 (see FIG. 3) as a starting position of the expansion is formed at the end 2b of the tube 2, and the left and right sides are accordingly changed. The tube opening 12 is deformed so that the opening angle θ is substantially 0 °. And the linear wall 15 which makes the same straight line of the direction where the combination part 11 and the tube junction part 12 cross | intersect the width direction is formed in the vicinity of the opening end 2d of a tube. The tip of the straight wall 15 is in contact with the tube inner surface 14.

  And in the area | region which changes from an AA cross section to a BB cross section, as shown in FIG.4 (b) and FIG. 5, the opening angle (theta) of the left and right tube junction part 12 changes from 180 degrees to 0 degrees. is decreasing. In the first embodiment, the decrease in the opening angle θ starts from the end in the longitudinal direction of the tube insertion hole 5e of the core plate 5a and extends to the vicinity of the tube opening end 2d according to the position in the longitudinal direction, that is, the tube. As the distance from the opening end 2d becomes smaller, the angle gradually changes so that θ becomes smaller. The tip of the tube joint portion 12 is in contact with the tube inner surface 14 within a range in which the opening angle θ gradually changes.

  The shape of the tube 2 is also grasped as follows. The heat exchanger includes a tube 2 and a core plate 5a having a tube insertion hole 5e into which the tube 2 is inserted. The tube 2 includes two side walls defining a flat cross section, two partition walls extending in parallel from one side wall to the other side wall, and extending from the two partition walls along the other side wall, And two joint portions 12 joined to the inner surface of the side wall. The two side walls extend in parallel in most of the longitudinal direction of the tube 2 to form a parallel portion. This parallel part is responsible for most of the heat exchange. The two side walls of the tube 2 are inclined so as to be separated from each other at the end portion inserted into the core plate 5a to form a widened portion. The two joint portions extend along the other side wall with a predetermined first width in the parallel portion, and extend along the other side wall with a second width smaller than the first width in the widened portion. In the range where the two joint portions are located away from the other side wall, the second width is grasped as a directional component extending along the other side wall.

  As described above, in the first embodiment, the end 2b of the tube 2 protruding outward from the core plate 5a is expanded, and the opening angle θ of the tube joint 12 becomes smaller as it approaches the open end 2d. Since the shape is gradually changed, the shapes of the combination portion 11 and the tube joint portion 12 can be smoothly changed as the fluid passage 2c advances in the longitudinal direction from the tube opening end 2d. Therefore, the fluid flow from the opening end 2d is prevented from being disturbed, and as a result, the flow path resistance can be reduced.

  Further, in the vicinity of the tube opening end 2d, the combination portion 11 and the tube joint portion 12 form a straight wall 15, so that the flow path resistance at the tube opening end 2d can be minimized.

  In addition, since the front-end | tip of the tube junction part 12 is in contact with the tube inner surface 14 in the tube end part 2b, the joint strength to the core plate 5a of the tube 2 can be raised and the deformation | transformation of the tube 2 can be prevented.

  Here, as a comparative example, FIG. 6 shows a case where the tube end portion is expanded without changing the opening angle of the tube joint portion 12 as described above. 6A is a BB cross section in FIG. 3, and FIG. 6B is a perspective view of the tube 2 in the comparative example viewed from the tube opening end 2d as in FIG. In this comparative example, the AA cross section is the same as that of the first embodiment, but in the widened portion 2e, the opening angle of the tube joint portion 12 remains 180 °, and therefore the tube end portion 2b. There is a gap between the tube joint portion 12 and the tube inner surface 14 in the entire region.

  Therefore, in the comparative example, the gap between the tube joint portion 12 and the tube inner surface 14 forms a dead end state in the longitudinal direction with respect to the fluid flowing in from the tube opening end 2d, so that the flow is disturbed. , Resulting in increased flow resistance.

  Next, a processing device for performing expansion of the tube end 2b and deformation of the tube joint 12 and a processing procedure using the processing device will be described. 7A and 7B are diagrams showing the processing apparatus 30, where FIG. 7A is a front view, FIG. 7B is a side view, FIG. 7C is a top view, FIG. 7D is a partially enlarged view of FIG. It is the elements on larger scale of (c). 7A shows the longitudinal direction and the width direction of the processing apparatus 30, and FIG. 7C shows the thickness direction. In addition, the longitudinal direction, the width direction, and the thickness direction of these processing devices correspond to the longitudinal direction, the width direction, and the thickness direction of the tube 2, respectively.

  The processing device 30 is a metal jig in which an insertion portion 31 inserted from the opening end 2d of the tube 2 and a base portion 32 held by a manufacturing device (not shown) are formed in the longitudinal direction. The insertion portion 31 includes a distal end portion 33, a passage fitting portion 34, a taper portion 36, and a parallel enlarged portion 41 in order from the distal end side. A slit 37 is formed in the longitudinal direction at the center of the insertion portion 31 in the width direction.

  The distal end portion 33 has a cross-sectional shape smaller than the cross section of the fluid passage 2 c of the tube 2, and further, a notch for preventing interference with the combination portion 11 and the tube joint portion 12 of the tube 2 at the end portion of the slit 37. A portion 39 is provided.

  The passage fitting portion 34 has an outer shape that is slidably fitted to the inner periphery of the fluid passage 2c, and has the same cross-sectional shape over the longitudinal direction.

  The taper portion 36 has the end portion of the passage fitting portion 34 as a connection portion 35, and has the same cross-sectional shape as the passage fitting portion 34 in the connection portion 35, and in the width direction according to the distance from the distal end in the longitudinal direction. It is formed so that the distance in the thickness direction intersecting with the diameter gradually increases. Thereby, when the insertion part 31 is inserted in the fluid passage 2c in the tube end part 2b, the tube end part 2b is expanded in the thickness direction. In the first embodiment, the distance in the width direction of the tapered portion 36 is also formed so as to gradually increase according to the distance from the tip. Therefore, the tube end 2b is expanded in the width direction.

  The parallel enlarged portion 41 is provided so that the base portion 32 and the tube opening end 2d do not interfere with each other, and has the same cross section in the longitudinal direction from the end position of the tapered portion 36 where the amount of increase in the sectional area of the tapered portion 36 becomes zero. It is formed to have a shape.

  On one surface in the thickness direction of the insertion portion 31, a concave groove 38 is continuously formed on both sides of the slit 37 along the slit 37 and from the distal end side to the groove end portion 40 of the parallel enlarged portion 41. Yes. In the first embodiment, the depth of the concave groove 38 is formed to be the same position as the bottom position of the depth of the concave groove 38 in the passage fitting portion 34 in the thickness direction. That is, the bottom of the concave groove 38 forms the same surface.

  When the insertion portion 31 is inserted into the tube end portion 2b, in the passage fitting portion 34, the bottom of the concave groove 38 is slidable with the surface of the tube joint portion 12 (the surface on the tube inner surface 14 side in FIG. 4). Therefore, when the passage fitting portion 34 moves in the flow passage 2c, the outer shape of the tube 2, the combination portion 11, and the tube joint portion 12 are not deformed.

  On the other hand, when the taper portion 36 moves in the longitudinal direction from the tube end portion 2b, the outer circumference of the tube 2 is set with the bottom position of the depth of the concave groove 38 as a reference position according to the amount of movement in the longitudinal direction. It is expanded in the thickness direction. Accordingly, the tube joint portion 12 is pushed by the concave groove 38 and deformed so that the opening angle θ becomes small. The decreasing rate of the opening angle θ is determined according to the taper angle of the taper portion 36.

  The manufacturing process of a tube is also demonstrated as follows. An L-shaped foot 12 and an inverted L-shaped foot 12 are formed at each end of the plate member that provides the wall surface of the tube 2. Here, the shape that can be referred to as an L-shape includes a J-shape. The tips of the feet 12 are arranged so as to extend in opposite directions. The opening angle θ of the foot 12 is approximately 180 °. The distal ends of the two feet 12 are arranged parallel to the inner surface of the tube 2, and in a typical example, are joined to the inner surface of the tube 2 to provide a joint. Another plate material may be interposed between the two feet 12 and the inner surface of the tube 2. The end 2b of the tube 2 is inserted into a tube insertion hole 5e provided in the core plate 5a. The distal end edge of the end 2b of the tube 2 protrudes from the core plate 5a, is the same as the surface of the core plate 5a, or is recessed from the surface of the core plate 5a. The processing device 30 is inserted into the end 2b of the tube 2, and the widened portion 2e is formed at the end 2b. The outer peripheral surface of the widened portion 2e and the tube insertion hole 5e are brought into contact with each other, so that the tube 2 is positioned on the core plate 5a. As for the foot | leg part 12, the angle between the two sides which prescribe | regulate the L shape or J shape gradually reduces toward the front-end edge of the tube 2 in the widened part 2e in the edge part 2b of the tube 2. As shown in FIG. It is deformed as follows. In a typical example, the two feet 12 reach an I shape at the distal end edge of the tube 2. In a typical example, the opening angle θ of the two feet 12 is deformed so as to become smaller as it approaches the tip of the tube 2.

  FIGS. 8A to 8C are diagrams showing a processing step by the processing apparatus 30. FIG. First, as shown to Fig.8 (a), the tube 2, the fin 3, and the insert 6 are arrange | positioned to an assembly jig | tool (not shown).

  Next, as shown in FIG. 8B, the tube end 2b of each tube 2 is inserted into the tube insertion hole 5e of the core plate 5a from above, and the core portion 4 is temporarily fixed by the core plate 5a.

  In this state, when the insertion portion 31 of the processing device 30 is inserted into the opening end 2d of the tube 2 from the distal end portion 33, and the taper portion 36 moves downward into the paper end portion 2b, the taper portion 36 causes the tube to move. The end portion 2b is widened to form the widened portion 2e, and the tube joining portion 12 is deformed by the concave groove 38 so that the opening angle θ is gradually reduced. Then, when the outer periphery of the tube end 2b comes into contact with the tube insertion hole 5e of the core plate 5a, the movement of the processing device 30 in the longitudinal direction is terminated, and the processing device 30 is moved upward from the paper surface and detached from the tube 2. In FIG. 8C, the insertion direction of the processing device 30 into the tube 2 and the shape of the tube end portion 2b after opening are shown on the same sheet.

  The step of forming the widened portion 2e at the tube end 2b outside the core plate 5a is performed at both ends of the tube 2 and both the tube longitudinal direction sides of the core 4 are fixed by the core plate 5a. The assembly of the core part 4 and the core plate 5a is brazed in a brazing process.

  Thereby, brazing between the left and right combination portions 11 in the tube 2, brazing between the tube joint portion 11 and the tube inner surface 14, brazing between the tube 2 and the fin 3 and the insert 6 and the fin 3, and an end portion of the tube Brazing of 2b and the core plate 5a is performed in one process, and the integral fixation of the core part 4 is completed.

  Next, another embodiment will be described. In the first embodiment, the combination portion 11 and the tube joint portion 12 are on the same straight line so that the opening angle θ of the tube joint portion 12 is substantially 0 ° in the BB cross section near the tube opening end 2d. Although the example which forms the straight wall 15 was shown, it is not restricted to this, It can be set as various magnitude | sizes as follows. In each example shown below, the AA cross section in FIG. 3 has the same shape as the first embodiment. Moreover, in each embodiment, a different structure from 1st Embodiment is demonstrated and description of the same component is abbreviate | omitted.

(Second Embodiment)
As shown in FIG. 9B, the opening angle of the tube joint portion 12 in the BB cross section near the tube opening end 2d as shown in FIG. 9B with respect to the same AA cross section as in the first embodiment shown in FIG. θ can be larger than 0 ° and smaller than 180 °, and the left and right combination portions 11 and the tube joint portion 12 can be formed in an inverted Y shape. In other words, the inverted Y-shape in the second embodiment corresponds to the end of the swell at the tube end 2b of the first embodiment in the middle of the front end side in the longitudinal direction.

  Because of the inverted Y-shape of the combination portion 11 and the tube joint portion 12 in the second embodiment, the tube joint portion 12 can be particularly deformed so as to be in contact with the tube inner surface 14 in the longitudinal direction. Smooth inflow and outflow of the fluid in 2d can be realized.

(Third embodiment)
10A, the same AA cross section as in the first embodiment, as shown in FIG. 10B, the cross section BB near the tube opening end 2d, and the left and right combination parts 11 The opening angle φ is formed, and the opening angle θ of the tube joint portion 12 is set to be larger than 0 ° and smaller than 180 °. At this time, φ <θ.

  As a result, the left and right combination portions 12 are in contact with only a part of the upper end of the sheet, and are brazed here. Moreover, the tube junction part 12 is deform | transforming so that it may contact with the tube inner surface 14 in a longitudinal direction.

  Therefore, also in the third embodiment, smooth inflow and outflow of fluid at the tube opening end 2d can be realized. That is, the left and right combination portions 11 can gradually deform the inner wall of the fluid passage 2c so as not to generate a flow turbulence even if the entire surface is not necessarily in contact.

(Fourth embodiment)
With respect to the same AA cross section as the first embodiment shown in FIG. 11 (a), the opening angle θ of the tube joint portion 12 decreases from 180 ° with the start of dilation at the tube end 2b, and the tube open end. In the BB cross section in the vicinity of 2d, as shown in FIG. 11 (d), the opening angle θ becomes 0 °, the combination part 11 and the tube joint part 12 form a straight wall 15, and the mouth in the thickness direction. The expansion distance is increased so that the tip of the straight wall 15 is separated from the tube inner surface 14.

  Between the AA cross section and the BB cross section, the tip of the tube joint 12 is brought into contact with the tube inner surface 14 as shown in FIG. In a portion close to the BB cross section, the tip of the tube joint portion 12 is separated from the tube inner surface 14 as shown in FIG.

  That is, in the fourth embodiment, the distal end of the tube joining portion 12 is separated from the tube inner surface 14 in the course of deformation of the tube joining portion 12 that reaches the BB cross-sectional position toward the distal end side in the longitudinal direction.

  Thereby, at the tube opening end 2d, the flow resistance can be minimized, and the flow of the fluid into and out of the fluid passage 2c can be made smooth. In addition, the end of the tube joint 12 can be brought into contact with the inner surface 14 of the deformed section, that is, partway through the widened portion 2e, and the core plate 5a can be maintained while maintaining an appropriate value of the widened angle of the tube end 2b. It is possible to improve the adhesiveness of brazing and secure brazing, liquid tightness and pressure resistance.

(Fifth embodiment)
With respect to the same AA cross section as in the first embodiment shown in FIG. 12 (a), the opening angle θ of the tube joint portion 12 decreases from 180 ° as the opening of the tube end 2b starts, and the tube open end In the BB cross section in the vicinity of 2d, as shown in FIG. 12C, the opening angle θ is 0 °, and the combination portion 11 and the tube joint portion 12 form a straight wall 15.

  However, in the fifth embodiment, in the deformation section of the tube joint 12 up to the vicinity of the BB cross-sectional position, the tip of the tube joint 12 is brought into contact with the tube inner surface 14 as shown in FIG. I have to. Then, at the position of the BB cross section where the deformation of the tube joint portion 12 is finished, the tip of the tube joint portion 12 is separated from the tube inner surface 14 as shown in FIG.

  Thereby, at the tube opening end 2d, the flow resistance can be minimized, and the flow of the fluid into and out of the fluid passage 2c can be made smooth. In addition, the end portion of the tube joint portion 12 can be brought into contact with the tube inner surface 14 over the entire deformation section of the tube joint portion, and the core plate 5a is maintained while maintaining an appropriate value of the widening angle of the tube end portion 2b. It is possible to improve the adhesiveness with the brazing, and it is possible to ensure brazing, liquid tightness and pressure resistance.

(Other embodiments)
(1) In each of the above embodiments, the start position of the widened portion 2e in the tube end portion 2b is shown as the position X1 (see FIG. 3) of the outer end portion of the tube insertion hole 5e. Instead, the magnifying may start from a position X2 below the position X1. That is, according to the size of the gap at the time of fitting between the outer periphery of the tube 2 and the tube insertion hole 5e, a widened state necessary for improving the adhesion between the tube 2 and the core plate 5a can be formed. Good.

  (2) In each of the above-described embodiments, the tube joint portion (foot portion) 12 is shown in an example in which the distal end side of the combination portion (partition wall) 11 is bent into a plate shape and formed into an L shape and an inverted L shape. For example, the distal end portion of the tube joint portion 12 may be formed in an arc shape or a J shape (reverse J shape) so as to be separated from the tube inner surface 14. Even in this case, the opening angle θ of the left and right tube joint portions 12 can be the angle formed by the tangential direction of the surface of the tube joint portion in the bent portion with the combination portion 11, and the tube joint portions are the same as in the above embodiments. Can be transformed.

  (3) In each of the above embodiments, an example in which only the brazing material is interposed between the tube joint portion 12 and the tube inner surface 14 is shown. However, the present invention is not limited thereto, and for example, a thin plate for configuring a fin in the passage May be interposed between the tube joint portion and the tube inner surface to braze them.

  (4) In each of the above-described embodiments, an example in which the forming direction of the combination portion 11 is perpendicular to the width direction at the center portion in the width direction of the tube 2, that is, the tube 2 is symmetrical in the width direction is shown. However, the present invention is not limited to this, and the combination part 11 may be arranged at a position shifted from the center in the width direction, or the combination part 11 may be formed so as to cross obliquely with respect to the width direction.

  (5) In each of the above-described embodiments, an example in which a plurality of tubes 2 are arranged in parallel in the horizontal direction so that the longitudinal direction of the tube 2 coincides with the vertical direction (up and down direction on the paper surface) is shown. The longitudinal direction of 2 may be arranged so as to coincide with the horizontal direction (left and right direction on the paper surface).

  (6) In each of the above embodiments, the tank body 5b is made of resin, but is not limited thereto, and may be made of metal (for example, aluminum alloy).

It is a front view of the radiator as a heat exchanger of this embodiment. It is an expanded sectional view which shows the principal part of FIG. It is a figure which shows CC cross section of FIG. (A), (b), (c) is a figure which shows the AA cross section in FIG. 3 of a tube edge part, or a BB cross section. It is the perspective view seen from the opening end of the tube which was expanded. (A) is a figure which shows the BB cross section of the tube of a comparative example, (b) is the perspective view seen from the opening end of the expanded tube of the comparative example. It is a figure which shows the processing apparatus 30, (a) is a front view, (b) is a side view, (c) is a top view, (d) is the elements on larger scale of (b), (e) is a figure of (c). It is a partial enlarged view. (A), (b), (c) is a figure which shows the process process by a processing apparatus. It is a figure which shows 2nd Embodiment, (a) is a figure which shows an AA cross section, (b) is a figure which shows a BB cross section. It is a figure which shows 3rd Embodiment, (a) is a figure which shows an AA cross section, (b) is a figure which shows a BB cross section. It is a figure which shows 4th Embodiment, (a) is a figure which shows AA cross section, (b) is a figure which shows the cross section of the site | part close to AA cross-sectional position, (c) is a BB cross-sectional position. The figure which shows the cross section of a near site | part, (d) is a figure which shows a BB cross section. It is a figure which shows 5th Embodiment, (a) is a figure which shows AA cross section, (b) is a figure which shows the cross section of the site | part between AA cross-sectional position and BB cross-sectional position, (c) ) Is a view showing a BB cross section.

Explanation of symbols

2 ... tube, 2a ... flat surface (side wall), 2b ... tube end, 2c ... fluid passage,
2d ... tube opening end, 2e ... widened portion, 3 ... fin, 5a ... core plate,
5e ... Tube insertion hole, 11 ... Combination part (partition wall), 12 ... Tube joint part (foot part),
13 ... front surface, 14 ... tube inner surface (back surface), 15 ... straight wall, 30 ... processing device,
31 ... Insertion part, 34 ... Passage fitting part, 36 ... Tapered part, 37 ... Slit, 38 ... Concave groove.

Claims (14)

Each of the left and right combination parts (11) and the left and right combination parts (11), both ends of the board in the width direction being continuously bent over the longitudinal direction intersecting the width direction, respectively, on the back side of the board. The left and right tube joints (12) are continuously bent over the longitudinal direction on the back surface side, and the plate is bent from both end sides to the back surface side, whereby the intermediate portion in the width direction. Then, at least a part of the front side of the left and right combination part (11) is in contact with each other over the longitudinal direction, and each surface on the front side of the left and right tube joint part (12) is a tube on the back side of the plate. A tube (2) formed to face the inner surface (14) and having a fluid passage (2c) formed in the longitudinal direction;
A tube insertion hole (5e) is provided, the end (2b) in the longitudinal direction of the tube (2) is inserted into the tube insertion hole (5e), and the outer periphery of the tube end (2b) is the tube. A heat exchanger (1) comprising: a core plate (5a) that forms a fixing frame of the core portion (4) formed by the tube (2) by being joined to the insertion hole (5e); There,
The opening angle (θ) formed by each surface on the surface side of the left and right tube joints (12) is small in a portion up to the tip of the tube end (2b). . In the vicinity of the tube end portion (2b), the end portion in the longitudinal direction of the combination portion (11) and the end portion in the longitudinal direction of the tube joint portion (12) are the same in the direction intersecting the width direction. 2. A heat exchanger according to claim 1, characterized in that it forms a straight wall (15) that forms a straight line. The heat exchanger according to claim 2, wherein the straight wall (15) is perpendicular to the tube inner surface (14) in the vicinity of the tube end (2b). The longitudinal angle (2b) of the tube (2) is characterized in that the opening angle (θ) of the left and right tube joints (12) is less than 180 degrees. The heat exchanger according to 1. The heat exchanger according to claim 1, wherein a part of the surface of the left and right combination part (11) is separated from each other at the longitudinal end (2b) of the tube (2). The said deformation | transformation of the said tube junction part (12) is gradually changed toward the opening end (2d) of the said tube (2) from the said joining position. The heat exchanger as described in. At least a part of the tube joint (12) is in contact with the inner surface (14) of the tube from the joint position to an intermediate position between the joint position and the open end (2d) of the tube (2). The heat exchanger according to any one of claims 1 to 6, wherein The tube joint (12) is in contact with the inner surface (14) of the tube according to the deformation of the tube joint (12) from the intermediate position toward the tube opening end (2d). The heat exchanger according to claim 7. The heat exchanger according to any one of claims 1 to 8, wherein the tube (2) has a symmetrical shape with respect to a center in the width direction. Tube (2);
A core plate (5a) having a tube insertion hole (5e) into which the tube (2) is inserted;
The tube (2)
Two side walls (2a) defining a flat cross section;
Two partition walls (11) extending in parallel from one side wall to the other side wall;
Two joints (12) extending from the two partition walls (11) along the other side wall (2a) and joined to the inner surface (14) of the other side wall (2a);
The two side walls (2a)
The tube (2) extends in parallel in most of the longitudinal direction to form a parallel portion, and the end (2b) inserted into the core plate (5a) is inclined so as to be separated from each other. Forming a widened portion (2e),
The two joints (12)
The parallel portion extends along the other side wall (2a) with a predetermined first width, and the widened portion (2e) has a second width smaller than the first width on the other side wall (2a). A heat exchanger characterized by extending along. From the left and right combination parts (11) formed so as to extend in the thickness direction intersecting the width direction at the center in the width direction and to be in contact with the opposing surfaces in the width direction, and the left and right combination parts (11) A processing device (30) for expanding the end portion (2b) of the tube (2), which includes a tube joint portion (12) formed to be bent in opposite directions and face the tube inner surface (14). ) And
A passage fitting portion (34) and a taper portion (36) are sequentially formed from the distal end side in the longitudinal direction that coincides with the formation direction of the fluid passage (2c) included in the tube (2), and the longitudinal direction A slit (37) for passing the combination part (11) through the passage fitting part (34) and the taper part (36) in the longitudinal direction is provided in the central part of the intersecting width direction, and the slit (37) An insertion portion (31) provided with concave grooves (38) for passing the tube joint portion (12) on both sides thereof in the longitudinal direction,
The passage fitting portion (34) includes an outer shape that is slidably fitted to an inner periphery of the fluid passage (2c) when inserted into the fluid passage (2c) from a tip portion.
The taper portion (36) has the same cross-sectional shape as the passage fitting portion (34) in the connection portion (35) with the passage fitting portion (34), and corresponds to the distance from the tip in the longitudinal direction. The processing apparatus is characterized in that the distance in the thickness direction intersecting the width direction is gradually increased. The processing apparatus according to claim 11, wherein the length of the taper portion (36) in the width direction is formed so as to gradually increase in accordance with the distance from the tip. On the distal end side of the passage fitting portion (34), a distal end portion (33) having a cross-sectional area that gradually becomes smaller than the sectional area of the passage fitting portion (34) according to the distance in the distal end direction is provided. And
A parallel enlarged portion (41) is formed in the longitudinal direction from a position where the amount of increase in cross-sectional area of the tapered portion (36) is zero,
The processing apparatus according to claim 11 or 12, wherein the slit (37) and the concave groove (38) are formed in at least a part of the parallel enlarged portion (41). L-shaped and inverted L-shaped feet (12) are formed at the ends of the plate material, and the opening angle (θ) between these feet (12) is set to approximately 180 ° and arranged parallel to the inner surface. Forming the tube (2),
The core plate (5a) is placed on the tube (2) by passing the longitudinal ends (2b) of the tube (2) through a plurality of tube insertion holes (5e) provided in the core plate (5a). And a process of
By inserting a processing device (30) into the tube end (2b) protruding from the core plate (5a), a widened portion (2e) is formed in the tube end (2b), and the foot portion Deforming the foot (12) so that the opening angle (θ) of (12) decreases toward the tip of the tube (2);
Brazing the core portion (4) composed of the tubes (2) fixed by the core plate (5a) and the fins (3) between the tubes;
The manufacturing method of the heat exchanger provided with.

Images