JP2007107755A - Heat exchanger, tube for heat exchanger and method of manufacturing them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger, a tube for the heat exchanger, and methods of manufacturing them, capable of easily continuously molding tubes, and preventing defective brazing between the tube and a tank portion. <P>SOLUTION: A caulked portion 111 of the tube 11 is configurated in such manner that edge portions 112, 113 of strip-shaped members are formed in a state of being overlapped in a width narrower than a minor axial direction Y of a flat cross-sectional shape of the tube. Thus the tube continuous body can be transported while surely caulking the caulked portion 111 from both sides. Further an outer peripheral face 111a of the caulked portion 111 can be smoothed in caulking work, and a tube insertion port 32a can be surely brazed even when it has the simple shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat exchanger for exchanging heat between an internal fluid and an external fluid, a tube used for the heat exchanger, and a method for manufacturing the same.

  As a prior art, there is a heat exchanger disclosed in Patent Document 1 below. In this heat exchanger, a plate-like member is formed so that both edges engage with each other to form a flat tube having a flat internal cross section.

And when manufacturing a heat exchanger, while engaging the engagement part of the both edges of a flat tube by brazing, both the longitudinal direction (internal fluid passage direction) both ends of a flat tube are brazed and joined to a tank part. ing.
JP 2005-106389 A

  Patent Document 1 shows a tube of a heat exchanger that has an oval outer shape and no step on the outer peripheral surface of the engaging portion. This is because even if the tube insertion port provided in the tank part for joining the tube end part to the tank part has a simple shape, it is difficult to form a large clearance between the tube and the tank part. It is presumed that this can be prevented.

  However, in the above-described conventional heat exchanger tube, the structure of the engaging portion is complicated in order to eliminate the level difference, and the forming process of the engaging portion is extremely complicated. If the forming process of the engaging portion is complicated as described above, it is difficult to continuously process the flat tube as a continuous body, and there is a problem that productivity is deteriorated.

  The present invention has been made in view of the above points, and is capable of easily performing continuous molding of a tube and capable of preventing a brazing failure between the tube and the tank portion. It aims at providing the exchanger, the tube for heat exchangers, and those manufacturing methods.

In order to achieve the above object, in the heat exchanger of the invention according to claim 1,
A tube (11) made of a plate-like member having an internal cross section formed into a flat shape;
A heat exchanger comprising a tank portion (3) in which an end portion of the tube (11) is inserted into the tube insertion port (32a) and brazed,
In the tube (11), on the end side in the long axis direction (X) having a flat cross section, both edges (112, 113) of the same plate-like member are in the short axis direction (Y) having a flat cross section. It is characterized by having an engaging portion (111) formed so that the outer peripheral surface (111a) becomes a substantially smooth surface while engaging within a width (W2) narrower than the width (W1).

  According to this, the engaging portion (111) between the two edge portions (112, 113) is formed within a width (W2) narrower than the width (W1) in the minor axis direction (Y) of the flat cross section. Therefore, the structure of the engaging portion (111) can be relatively simplified, even while conveying both edges (112, 113) of the plate-like member from both sides in the direction of the tube internal fluid passage, The engaging part (111) can be formed.

  The outer peripheral surface (111a) of the engaging portion (111) is a substantially smooth surface. Therefore, even if the tube insertion opening (32a) of the tank part (3) has a relatively simple shape, a large clearance is formed between the engagement part (111) of the tube (11) and the tank part (3). hard.

  In this way, it is possible to easily perform the continuous forming process of the tube (11), and it is possible to prevent the brazing failure between the tube (11) and the tank portion (3).

  Further, in the heat exchanger according to the second aspect of the present invention, the engaging portion (111) is such that both edge portions (112, 113) of the plate-like member are plastically deformed and the outer peripheral surface (111a) is substantially smooth. It is characterized by being a surface.

  According to this, the outer peripheral surface (111a) of an engaging part (111) is easily made into a substantially smooth surface by pressing both edge parts (112, 113) of a plate-shaped member from both sides, and plastically deforming. be able to.

  In the heat exchanger according to the third aspect of the present invention, the engaging portion (111B) has the edge portions (112, 1311) of the plate-like member overlapped with the end portions (114, 115) aligned. The outer peripheral surface (111a) is a substantially smooth surface.

  According to this, the outer peripheral surface of the engaging portion (111B) can be easily obtained by pressing both edges of the plate-like member (112, 1131) with the end portions (114, 115) aligned and pressed from both sides. (111a) can be a substantially smooth surface.

  Moreover, in the heat exchanger of invention of Claim 4, an engaging part (111C) is an edge part (115) of at least one edge part (113) among both edge parts (112, 113) of a plate-shaped member. ) Is chamfered and the outer peripheral surface (111a) is a substantially smooth surface.

  According to this, the outer peripheral surface (111C) of the engaging portion (111C) can be easily formed by forming the chamfered portion (116) at at least one end portion (115) of both edge portions (112, 113) of the plate-like member. 111a) can be a substantially smooth surface.

Moreover, in the heat exchanger of invention of Claim 5, in the heat exchanger of invention of Claim 4,
The tube (11) has an inclined surface (117) that is inclined so that the width in the minor axis direction (Y) having a flat cross-sectional shape increases as the portion adjacent to the engaging portion (111C) moves away from the engaging portion (111C). Have
The engaging portion (111C) is characterized in that the end portion (115) of the plate-like member is chamfered along the inclined surface (117), and the outer peripheral surface (111a) is a substantially smooth surface. Yes.

  According to this, by forming the chamfered portion (116) corresponding to the inclined surface (117) at the end portion (115) of the plate-like member, the outer peripheral surface (111a) of the engaging portion (111C) can be easily made substantially smooth. It can be a good surface.

In the heat exchanger tube of the invention according to claim 6,
Heat exchange consisting of a plate-like member whose inner cross section is formed in a flat shape, with the end portion inserted into the tube insertion port (32a) of the tank portion (3) and brazed to the tank portion (3) A dexterous tube,
On the end side in the major axis direction (X) of the flat cross section, both edges (112, 113) of the plate member are narrower than the width (W1) in the minor axis direction (Y) of the flat cross section ( W2) is engaged, and the outer peripheral surface (111a) has an engaging portion (111) formed to be a substantially smooth surface.

  According to this, the heat exchanger of Claim 1 can be comprised. Therefore, it is possible to easily perform the continuous forming process of the tube (11), and to prevent the brazing failure between the tube (11) and the tank portion (3).

Moreover, in the manufacturing method of the heat exchanger of invention of Claim 7,
A forming step of bending the plate-like member and forming the tube (11) into a flat shape so that the internal cross section is flat;
An arrangement step of arranging the end of the plate-shaped member formed in the tube (11) shape formed in the forming step in the tube insertion opening (32a) of the tank portion (3);
It is a manufacturing method of a heat exchanger provided with the joining process of brazing the plate-shaped member which makes a tube (11) shape, and a tank part (3) after an arrangement process,
In the molding step, on the end side in the long axis direction (X) having a flat cross section, the two edge portions (112, 113) of the same plate-like member are conveyed from both sides in the direction of the internal fluid passage, The engaging portion (111) that engages within the width (W2) narrower than the width (W1) in the minor axis direction (Y) of the flat cross section is formed, and the outer peripheral surface (111a) of the engaging portion (111) is It is characterized by being molded so as to have a substantially smooth surface.

  According to this, the heat exchanger of Claim 1 can be manufactured. Since the structure of the engaging portion (111) can be relatively simplified, in the molding process, both edges (112, 113) of the plate-like member are pressed from both sides while being conveyed in the direction of the tube internal fluid passage. However, the engaging portion (111) can be formed.

  Moreover, the outer peripheral surface (111a) of the engaging part (111) is made into a substantially smooth surface in the molding process. Therefore, in the arrangement step, even if the tube insertion opening (32a) of the tank (3) is made relatively simple, a large space is formed between the engaging portion (111) of the tube (11) and the tank (3). It is difficult to form a clearance, and the tube (11) and the tank portion (3) can be securely brazed and joined in the joining step.

  In this way, it is possible to easily perform the continuous forming process of the tube (11), and it is possible to prevent a brazing failure between the tube (11) and the tank portion (3).

  In the heat exchanger manufacturing method according to the eighth aspect of the present invention, in the molding step, both edge portions (112, 113) of the plate-like member are plastically deformed, and the outer peripheral surface of the engaging portion (111) ( 111a) is formed to have a substantially smooth surface.

  According to this, the heat exchanger of Claim 2 can be manufactured.

  In the heat exchanger manufacturing method according to the ninth aspect of the present invention, in the molding step, both edge portions (112, 1311) of the plate-like member are overlapped with their end portions (114, 115) aligned. Thus, the outer peripheral surface (111a) of the engaging portion (111B) is shaped to be a substantially smooth surface.

  According to this, the heat exchanger of Claim 3 can be manufactured.

  In the method for manufacturing a heat exchanger according to claim 10, in the molding step, at least one end (115) of both edge portions (112, 113) of the plate-like member is chamfered to be engaged. The outer peripheral surface (111a) of the portion (111C) is shaped to be a substantially smooth surface.

  According to this, the heat exchanger of Claim 4 can be manufactured.

Moreover, in the manufacturing method of the heat exchanger of invention of Claim 11, in the manufacturing method of invention of Claim 10,
In the molding step, the plate is formed so as to have an inclined surface (117) that is inclined so that the width in the minor axis direction (Y) of the cross section increases as the portion adjacent to the engaging portion (111C) moves away from the engaging portion (111C). The end member (115) of the plate member is chamfered along the inclined surface (117), and the outer peripheral surface (111a) of the engaging portion (111C) becomes a substantially smooth surface. It is characterized by molding.

  According to this, the heat exchanger of Claim 5 can be manufactured.

Moreover, in the manufacturing method of the tube for heat exchangers of invention of Claim 12,
Bending the plate-like member, comprising a forming step of forming the tube (11) body shape so that the internal cross section becomes a flat shape,
A method for producing a heat exchanger tube for inserting an end portion into a tube insertion opening (32a) of a tank portion (3) and brazing to the tank portion (3),
In the forming step, on the end side in the long axis direction (X) of the flat cross section, the two edges (112, 113) of the plate-like member are conveyed from both sides in the direction of the internal fluid passage, and the flat shape An engaging portion (111) that engages within a width (W2) that is narrower than the width (W1) in the end axis direction (Y) is formed, and the outer peripheral surface (111a) of the engaging portion (111) is substantially smooth. It is characterized by being molded so as to be a surface.

  According to this, the tube for heat exchangers of Claim 6 can be manufactured.

  In addition, the code | symbol in the parenthesis attached | subjected to each said means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an external perspective view showing an overall configuration of an evaporator 1 which is a heat exchanger in a first embodiment to which the present invention is applied, and FIG. 2 is a cross-sectional view showing the vicinity of an upper header tank 3 in FIG. It is. FIG. 3 is a cross-sectional view of the inner fin tube 10 used in the core portion 2 of the evaporator 1, and FIG. 4 is an enlarged view of a main part of the inner fin tube 10.

  First, the evaporator 1 used for a vehicle air conditioner will be described. The evaporator 1 is disposed in a refrigeration cycle, and is heat-exchanged to evaporate the refrigerant after being compressed to a high temperature and a high pressure by a compressor, radiated and cooled by a radiator, and decompressed to a low temperature and low pressure by a decompressor. It is a vessel.

  As shown in FIGS. 1 and 2, the evaporator 1 mainly includes a core portion 2, an upper header tank 3, a lower header tank 4, and the like. The core portion 2 is formed by alternately laminating a plurality of inner fin tubes 10 and a plurality of outer fins 20, and arranging a side plate 25 on the outer side of both outermost outer fins 20 in the laminating direction. It is.

  As shown in FIG. 3, the inner fin tube 10 is formed by inserting an inner fin 12 into a tube 11.

  The tube 11 has a flat cross section perpendicular to the longitudinal direction (internal fluid passage direction) by bending a thin (for example, 0.2 mm thick) aluminum strip (corresponding to the plate member in the present invention). It is the pipe member formed in the shape.

  As for the internal cross section of the tube 11, one side is formed in a curved surface and the other is V-shaped. The shape is a shape that can be called a long rhombus or a flat shape. The longitudinal direction of the internal cross section of the tube 11 is the major axis direction X, and the lateral direction is the minor axis direction Y.

  More specifically, the bent portion 11a is formed by bending a substantially central portion in the width direction of the belt-shaped plate member, and the two bent plate portions 11b extending from the bent portion 11a so as to face each other are on the side opposite to the bent portion (see FIG. 3. The tube 11 is formed by caulking the lower side of the figure, one end side in the long axis direction X of the flat shape in the present invention (by setting the caulking portion (corresponding to the engaging portion) 111). Yes.

  The inner fin 12 is a fin member for increasing the heat transfer area and improving the structural strength while giving a turbulent flow effect to the internal fluid flowing through the tube 11. As with the tube 11, the inner fin 12 is formed by rolling a thin (for example, 0.1 mm) aluminum strip-shaped plate material to form a corrugated portion 12a in the middle in the width direction of the strip-shaped plate material. It is a corrugated fin.

  Further, both end portions of the inner fin 12 in the width direction (the long axis direction X of the tube 11) are formed as flat plate portions 12b and 12c having a flat plate shape along the width direction. When the inner fin 12 is inserted into the tube 11, one flat plate portion 12 b comes into contact with the inner wall of the bent portion 11 a of the tube 11 and the other flat plate portion 12 c is caulked to the caulking portion 111 of the tube 11. Yes.

  The plate-like member forming the tube 11 employs a bare material whose surface is not clad with a brazing material, and the plate-like member constituting the inner fin 12 is a clad material whose brazing material is clad in advance on both surfaces. Is adopted. The inner fin 12 is brazed to the inner surface of the tube 11 to form the inner fin tube 10.

  The caulking part 111 is a main part to which the present invention is applied, and will be described in detail later.

  The outer fin 20 shown in FIG. 1 is a roller molded product obtained by corrugating a thin aluminum strip having a brazing material clad on both surfaces in advance, and a louver (not shown) for increasing the heat exchange efficiency on the surface. Is formed. The outer fin 20 is brazed to the inner fin tube 10 (the outer surface of the tube 11 flat plate portion 11b).

  The side plate 25 forms a reinforcing member in the core portion 2 and is formed by pressing an aluminum flat plate made of a bare material in which a brazing material is not clad.

  The side plate 25 has an end portion in the longitudinal direction formed in a flat plate shape, and most of the other portions are formed in a U-shaped cross section that opens outward in the stacking direction of the inner fin tube 10 and the outer fin 20. It is brazed to the outer fin 20.

  The upper header tank 3 includes a tank header 31 on the non-tube side and a plate header 32 on the tube side which are divided into two in the longitudinal direction (extension direction, internal fluid passage direction) of the inner fin tube 10, and a cap 33 is provided. It has been.

  Each of the tank header 31 and the plate header 32 has a cross-sectional shape to which two semicircular shapes or two semirectangular shapes are connected, and is formed by pressing an aluminum flat plate. The tank header 31 is clad with brazing material on both sides in advance, and the plate header 32 is clad with brazing material on the inner surface in advance.

  Both headers 31 and 32 are fitted and brazed together to form a cylindrical body in which two internal spaces are arranged in the flow direction of the blown air.

  And the cap 33 which shape | molded the flat plate made from aluminum by press work is brazed to the opening part of the longitudinal direction edge part of the upper header tank 3, and this opening part is obstruct | occluded.

  Furthermore, two separators 34 that divide the two internal spaces in the left-right direction in FIG. 1 are brazed to the approximate center of the upper header tank 3. Further, in the region on the right side of the separator 34 shown in FIG. 1 of the upper header tank 3, the two internal spaces of the upper header tank 3 communicate with each other through a plurality of communication paths (not shown).

  The lower header tank 4 is similar to the upper header tank 3 described above, and caps 43 are provided at openings at both ends in the longitudinal direction of a cylindrical body constituted by the tank header 41 and the plate header 42. However, the separator 34 and the communication path described as the configuration of the upper header tank 3 are not provided.

  Further, on the wall surface of the upper and lower header tanks 3 and 4 on the core 2 side, tube insertion holes 32a and side plate insertion holes (not shown) are provided at the same pitch in the longitudinal direction. The direction end portion side and the longitudinal direction end portion side of the side plate 25 are respectively inserted and brazed. As a result, the inner fin tube 10 communicates with the internal space of the upper and lower header tanks 3, 4, and the side plate 25 is supported by the upper and lower header tanks 3, 4 at the end in the longitudinal direction.

  A block-like joint 5 provided with an inflow port 51 through which a refrigerant flows and an outflow port 52 through which the refrigerant flows out is brazed near the left side of the upper header tank 3 in FIG. The inflow port 51 communicates with the inside of the upper header tank 3 in the portion a shown in FIG. 1 and the outflow port 52 communicates with the inside of the upper header tank 3 in the portion b shown in FIG.

  The inner fin tubes 10 are arranged in two rows corresponding to the two internal spaces of the upper and lower header tanks 3 and 4 on the upstream side and the downstream side of the blast air flow that is the external fluid.

  In the evaporator 1 formed as described above, after the refrigerant flows into the part a of the upper header tank 3 from the inflow port 51, it flows by making a U-turn up and down the inner fin tube 10 group on the downstream side of the blown air flow. The upper header tank 3 in FIG. 1 moves to the inner fin tube 10 group on the upstream side of the blown air flow on the right side and similarly makes a U-turn up and down and flows out from the outlet 52. During this time, the evaporator 1 evaporates the refrigerant and cools the blown air by the latent heat of evaporation.

  Next, the configuration of the caulking portion 111 of the inner fin tube 10 will be described.

  As shown in FIG. 3, the outer tube 11 of the inner fin tube 10 has both edges 112 of the same plate-shaped member at one end (lower end in the figure) in the long axis direction X having a flat cross section. 113 (see FIG. 4) are engaged with each other within a width W2 narrower than the width (thickness of the flat tube 11) W1 of the flat shape of the tube 11 in the short axis direction Y1 to form a caulking portion 111. Yes.

  The plate material of the tube 11 has two parallel flat plate portions 11b and 11b as two main planes. The flat plate portions 11b and 11b are connected on the one hand by the bent portion 11a and on the other hand by the joint portion 11c. In the bent portion 11a, the plate material continuous to the flat plate portions 11b and 11b is bent so as to exhibit a curved surface. In the joint portion 11c, a slope portion 11d continuous from the one flat plate portion 11b at a predetermined angle and a slope portion 11e continuous from the other flat plate portion 11b at a predetermined angle are formed. These slope portions 11d and 11e are formed so as to approach each other from the flat plate portion 11b. A caulking portion 111 is formed at the tips of the slope portions 11d and 11e. A plate-like edge 112 extending in the long axis direction is formed at the tip of the slope 11d. An edge 113 is formed at the tip of the slope 11e.

  Specifically, as shown in FIG. 4, the plate-like member constituting the tube 11 is composed of a flat plate portion 12 c of the inner fin 12 by an inner surface 112 a of one edge 112 and an inner surface 113 a of the other edge 113. Is pinched.

  The other edge 113 is bent in a U shape so as to wrap around the tip (end) 114 of one edge 112. The edge portion 113 includes a base portion 11f positioned in parallel to one side of the edge portion 112, a bent portion 11g enclosing the tip portion 114, and a presser positioned in parallel to the other side of the edge portion 112. And a plate portion 11h. Of the inner side surface 113a of the edge portion 113, a portion in the vicinity of the front end portion (end portion) 115 of the pressing plate portion 11h is pressed against the outer side surface 112b from the slope portion 11d to the edge portion 112.

  In this way, the caulking portion 111 is formed as an engaging portion having a narrow width W2 (for example, about 0.7 mm) with respect to the width W1 (for example, about 1.7 mm) in the tube 11 minor axis direction Y.

  In the caulking portion 111, caulking is performed by being pressed from the left and right directions in FIG. Due to this pressing force, both edge portions 112 and 113 are plastically deformed, and the front end portion 115 of the edge portion 113 is plastically deformed and buried in the edge portion 112 side, and the outer peripheral surface 111a of the caulking portion 111 has no step, or The smooth surface is small enough to make the step inconspicuous.

  In this embodiment, the outer surface 11i of the pressing plate portion 11h is smoothly continuous with the outer surface 11j of the inclined surface portion 11d. The outer side surface 11i and the outer side surface 11j can provide a continuous surface. The outer side surface 11i and the outer side surface 11j can be formed leaving a step sufficiently smaller than the thickness of the plate material therebetween. This shape also provides a smooth outer surface 111a that can achieve the intended purpose. At the tips of two V-shaped slope portions 11d and 11e, a joint portion 11c that joins both edges of the plate material of the tube 11 and the inner fin is provided so as to protrude. The joint 11c protrudes in a fin shape. The joint portion 11c is formed as a caulking portion 111 that has been wound.

  Next, the manufacturing method of the heat exchanger of this embodiment is demonstrated easily.

  In the heat exchanger manufacturing apparatus according to the present embodiment, as shown in a schematic process sequence in FIG. 5, a continuous body of flat inner fin tubes 10 forming the core portion 2 of the evaporator 1 is formed to a predetermined length. A process of cutting (step 210, corresponding to the molding process of the present invention), a process of temporarily assembling the cut inner fin tube 10 together with members constituting the radiating fins 20, the tank portions 3, 4 and the like (step 220, arrangement of the present invention) Equivalent to the process), a step of brazing and joining the constituent members with the brazing material layer appropriately formed on the surface of the constituent members by heating the temporary assembly (step 230, equivalent to the joining step of the present invention), and The evaporator 1 is manufactured by sequentially executing a step (step 240) of performing a leakage inspection of the evaporator 1 after brazing.

  FIG. 6 shows an inner fin tube manufacturing apparatus (hereinafter referred to as manufacturing apparatus) 100 that performs a portion corresponding to the tube forming step 210 shown in FIG.

  As shown in FIG. 6, the manufacturing apparatus 100 forms a tube 11, inserts an inner fin 12 into the tube 11 and assembles the tube forming portion 110, and an inner fin forming portion 120 that molds the inner fin 12. The inner fin 12 includes an inner fin transport unit 130 that transports the molded inner fin 12 to the tube forming unit 110 side.

  The tube forming part 110 includes a tube skin forming part 110A that forms a bent tube 11a and a flat plate part 11b mainly from a strip-shaped plate member wound around a coil by using a plurality of sets of rollers, and a tube 11 in an outer skin state. The inner fin 12 is inserted into the cylindrical tube 11, and an assembly / caulking portion 110B for forming the caulking portion 111 using a plurality of sets of rollers, and a continuous molded product from the assembly / caulking portion 110B to a predetermined length It has the cutting part 110C which cuts and makes the inner fin tube 10. Each part 110A, 110B, 110C is arrange | positioned in series, and each shaping | molding is performed continuously.

  The inner fin molding part 120 is arranged in parallel so that the position of the inner fin 12 to be molded is a predetermined distance in the horizontal direction from the outer tube 11 molded by the tube skin molding part 110A and on the lower side. The band-like inner fin 12 is formed by forming the wave-like portion 12a and the flat plate portions 12b and 12c from the belt-like plate material wound around the coil by using a plurality of sets of rollers.

  In the manufacturing apparatus 100, the tube-shaped tube 11 is formed from the strip-shaped plate material in the tube-shell forming portion 110A of the tube forming portion 110. Further, in the inner fin forming portion 120, the band-shaped inner fin 12 is formed. The inner fin 12 formed into a belt shape is conveyed by the inner fin conveying unit 130 to the assembling / caulking unit 110B side.

  The belt-like inner fin 12 enters the outer tube 11 and is shaped so as to have the shape of the inner fin tube 10 by the assembly / caulking portion 110B. At this time, with the roller of the assembly / caulking part 110B, the caulking part 111 composed of both edge parts 112, 113 of the belt-like plate material is pressed and caulked from both sides, and conveyed in the tube continuous direction (inner fluid passage direction), The caulking part 111 is formed, and the outer peripheral surface 111a of the caulking part 111 is formed to be a smooth surface.

  Further, the inner fin tube 10 that is continuously formed is cut into a predetermined length by the cutting part 110C, and the original inner fin tube 10 is completed one by one. Arranged and stored in the area.

  According to the above-described configuration and manufacturing method, the outer tube 11 in the inner tube 10 has a relatively simple caulking portion 111, and the caulking portion 111 has a width W1 in the minor axis direction Y of a flat tube cross section. Within the narrower width W2, the edge portions 112 and 113 of the strip plate member are formed so as to overlap each other. In the caulking portion 111 having a narrow overlapping structure with a narrow width W2, stress is difficult to escape in a direction other than the pressing direction when pressed.

  Therefore, in the tube forming part 110 of the manufacturing apparatus 100, the continuous tube body can be transported while firmly crimping the crimped part 111 having a narrow width W2 from both sides.

  Further, during the caulking process, the outer peripheral surface 111 a of the caulking portion 111 becomes a smooth surface without a step due to plastic deformation of both edge portions 112 and 113. Therefore, as shown in FIG. 4, even if the tube insertion port 32a of the header tank has a simple shape, a large clearance is formed between the caulking portion 111 of the inner fin tube 10 and the header tanks 3 and 4 in the temporary assembly process. However, it is difficult to perform brazing reliably in the brazing process.

  In this way, continuous molding of the inner fin tube 10 can be easily performed, and poor brazing between the inner fin tube 10 and the header tanks 3 and 4 can be prevented.

  In addition, the caulking portion 111 outer peripheral surface 111a can be easily formed into a smooth surface without a step due to plastic deformation accompanying press during caulking.

  The inventor has confirmed that the inner fin tube 10 can be continuously processed at a high speed of 300 m / min by the configuration and the manufacturing method of the present embodiment.

  In the present embodiment, the outer peripheral surface 111a of the caulking portion 111 is a smooth surface without a step, but if it is a substantially smooth surface with a slight step, it is between the inner fin tube 10 and the header tanks 3 and 4. Brazing failure can be prevented.

  The inventor evaluates the clearance formed by the step of the outer peripheral surface 111a of the caulking part 111 and the brazing property, sets the step due to the plate thickness in the caulking part 111 to less than 0.2 mm, and the clearance part 32b shown in FIG. If the length of the tube (longitudinal direction X of the tube cross section) W3 is less than 0.25 mm, it is possible to suppress the occurrence of brazing defects even if the shape of the tube insertion opening 32a is a simple shape that does not consider the step shape. Have confirmed.

  That is, it can be said that the outer peripheral surface 111a of the caulking portion 111 capable of setting the clearance portion 32b within the above-mentioned size range is a substantially smooth surface as referred to in the present invention.

  Although explanation is omitted in the above-described configuration, in the evaporator 1 of the present embodiment, the inner fin tube 10 is arranged so that the caulking portion 111 is on the upstream side in the flow direction of the blown air that is the external fluid. Yes. Further, as is apparent from FIG. 3, the caulking portion 111 is disposed substantially at the center of the inner fin tube 10 in the tube cross-section short axis direction Y.

  Therefore, in each of the inner fin tubes 10 constituting the core portion 2, the blown air can be easily evenly distributed, and the heat exchange performance can be improved. Moreover, since the outer peripheral surface 111a is a smooth surface in the caulking portion 111, the flow resistance is not increased by the step, and the heat exchange performance can be further improved.

  In addition, since the blown air distributed by the caulking portion 111 flows toward the joint portion between the inner fin tube 10 and the outer fin 20, when there is condensed water or the like staying in the vicinity of the joint portion, This can be reliably removed by the blown air.

(Second Embodiment)
Next, a second embodiment will be described based on FIG.

  The second embodiment is different from the first embodiment in the configuration of the engaging portion. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 7, in the present embodiment, the lengths of both edges 112, 1311 of the plate-like member forming the tube 11 are the same, and both edges 112, 1311 are aligned with the respective ends 114, 115. Then, the flat plate portions 12c of the inner fins 12 are sandwiched and overlapped (the shape is a nesting).

  In the tube forming step, the engaging portion 111B on which both edge portions 112 and 1311 are overlapped is conveyed in the longitudinal direction (in the direction of the internal fluid passage) while pressing from both sides.

  According to this, both the edge portions 112 and 1131 of the plate-like member are overlapped with the end portions 114 and 115 aligned and pressed from both sides, so that the outer peripheral surface 111a of the engaging portion 111B can be easily formed without a step. It can be a smooth surface.

  Therefore, as in the first embodiment, the inner fin tube 10 can be easily continuously formed, and the clearance is not easily formed even if the tube insertion port 32a has a simple shape. A brazing failure between the header tanks 3 and 4 can be prevented.

  In the present embodiment, the engaging portion 111B only overlaps both the edge portions 112 and 1311, of the plate-like member that becomes the tube 11, but for example, as shown in FIG. The outer corners 111a of the engaging portions 111B may be chamfered by chamfering the outer corners on the tip portions 114 and 115 side.

(Third embodiment)
Next, a third embodiment will be described based on FIG.

  The third embodiment differs from the first embodiment in the configuration of the engaging portion. In addition, about the part similar to 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 9, in the present embodiment, the chamfered portion is formed by chamfering the corner portion between the front end portion 115 of the edge portion 113 and the inner side surface 113 a among the two edge portions 112, 113 of the plate-like member forming the tube 11. 116 is formed.

  In the tube 11, the width (W2 in the first embodiment) of the caulking portion 111C is smaller than the width W1 in the short axis direction Y of the tube 11, and therefore the portion adjacent to the caulking portion (engaging portion) 111C is caulked. The inclined surface 117 is inclined so that the width in the minor axis direction Y having a flat cross-sectional shape increases as the distance from the portion 111C increases.

  The chamfered portion 116 described above is formed corresponding to the inclined surface 117, and in the caulking portion 111C, the chamfered portion 116 is disposed along the inclined surface 117.

  In the tube forming step, the caulking portion 111C with which both edge portions 112 and 113 are engaged is conveyed from the both sides in the longitudinal direction (in the direction of the internal fluid passage).

  According to this, when both edge portions 112 and 113 of the plate-like member are pressed from both sides by caulking, the outer peripheral surface 111a of the caulking portion 111C can be easily formed without greatly plastically deforming both edge portions 112 and 113. A substantially smooth surface without a step can be obtained.

  Therefore, as in the first embodiment, the inner fin tube 10 can be easily continuously formed, and the clearance is not easily formed even if the tube insertion port 32a has a simple shape. A brazing failure between the header tanks 3 and 4 can be prevented.

  In addition, compared with the first embodiment, the stress that is urged during the caulking process of the caulking portion 111C can be significantly reduced.

(Other embodiments)
In each of the above embodiments, the edge of the plate-like member is plastically deformed or chamfered at the engaging portion of the tube 11 so that the outer peripheral surface of the engaging portion is a substantially smooth surface. A smooth surface may be formed.

  Further, in each of the above embodiments, the inner fin tube 10 in which the inner fins 12 are joined and arranged in the tube 11 is used. However, the present invention can be applied even when a tube without an inner fin is used. Is possible. Moreover, even if it has an inner fin, it is applicable also to the tube which is not arrange | positioned at an engaging part.

  In each of the above-described embodiments, one of the internal cross sections of the tube 11 is a curved surface and the other is a V-shape. The shape is a shape that can be referred to as a long rhombus or a flat shape, but may be a substantially oval shape that is formed by a curved surface or a substantially curved surface.

  Moreover, in each said embodiment, although the header tank was comprised combining the tank header, the plate header, etc., a tank structure is not limited to this. For example, a cap or the like may be combined with the integral cylindrical tank body. Further, the arrangement of the header tank is not limited to the top and bottom of the core portion 2.

  Moreover, in each said embodiment, although the tube 11 was formed with one plate-shaped member, you may comprise with a some member. For example, a tube may be formed by combining two plate-like members, and engaging portions may be formed at both ends in the cross-sectional major axis direction.

  Moreover, in each said embodiment, although the heat exchanger was the evaporator 1, it is not limited to this. For example, the present invention can be widely applied to heat exchangers such as a condenser, a heater core, and a radiator.

It is an external appearance perspective view which shows the whole structure of the evaporator 1 which is a heat exchanger in 1st Embodiment to which this invention is applied. FIG. 3 is a cross-sectional view showing the vicinity of an upper header tank 3 in an evaporator 1. It is sectional drawing of the inner fin tube 10 used for the core part 2 of the evaporator 1. FIG. 3 is an enlarged cross-sectional view of a main part of the inner fin tube 10. FIG. FIG. 3 is a diagram showing a schematic manufacturing process of the evaporator 1. It is a schematic diagram which shows the inner fin tube manufacturing apparatus 100. FIG. It is a principal part expanded sectional view of the inner fin tube 10 in 2nd Embodiment. It is a principal part expanded sectional view of the inner fin tube 10 in the modification of 2nd Embodiment. It is a principal part expanded sectional view of the inner fin tube 10 in 3rd Embodiment. It is an expanded sectional view for demonstrating the clearance part in a tube insertion opening.

Explanation of symbols

1 Evaporator (heat exchanger)
3 Upper header tank (tank)
4 Lower header tank (tank)
10 Inner fin tube 11 Tube 32a Tube insertion port 111, 111C Caulking portion (engaging portion)
111B engagement part 112,113,1311 edge part 114,115 tip part (end part)
116 Chamfered portion 117 Inclined surface W1 Width in the long axis direction of the flat tube cross section W2 Width in the long axis direction of the engaging portion X Long axis direction of the flat tube cross section Y Short in the cross section of the flat tube Axial direction

Claims (12)

A tube (11) having a plate-like member whose internal cross section is formed in a flat shape;
An end of the tube (11) is a heat exchanger comprising a tank part (3) inserted into the tube insertion port (32a) and brazed and joined,
As for the said tube (11), the both ends of the said plate-shaped member (112, 113) are the width | variety of the said flat-shaped short-axis direction (Y) in the edge part side of the said flat-shaped long-axis direction (X). (W1) A heat exchanger characterized by having an engaging portion (111) formed so as to be engaged within a narrower width (W2) and to have a substantially smooth outer peripheral surface (111a).   2. The engagement portion (111) according to claim 1, wherein the both edge portions (112, 113) of the plate-like member are plastically deformed to form the substantially smooth surface. Heat exchanger.   The engaging portion (111B) has the both edges (112, 1131) of the plate-like member overlapped with the end portions (114, 115) aligned to form the substantially smooth surface. The heat exchanger according to claim 1.   The engaging portion (111C) is characterized in that the substantially smooth surface is formed by chamfering at least one end (115) of the both edge portions (112, 113) of the plate-like member. The heat exchanger according to claim 1. The tube (11) has an inclined surface (117) that is inclined such that the width in the minor axis direction (Y) increases as the portion adjacent to the engaging portion (111C) moves away from the engaging portion (111C). Have
The engaging portion (111C) is characterized in that the end portion (115) of the plate-like member is chamfered along the inclined surface (117) to form the substantially smooth surface. The heat exchanger according to claim 4. Heat that is made of a plate-like member having an inner cross section formed in a flat shape, and whose end is inserted into the tube insertion port (32a) of the tank (3) and brazed to the tank (3). An exchanger tube,
On the end side in the major axis direction (X) of the flat shape, both edges (112, 113) of the plate-like member are narrower than the width (W1) in the minor axis direction (Y) of the flat shape ( W2) A heat exchanger tube characterized by having an engaging portion (111) formed so as to engage with each other and have a substantially smooth outer peripheral surface. A forming step of bending the plate-like member and forming the tube (11) into a flat shape so that the internal cross section is flat;
An arrangement step of arranging an end portion of the plate-shaped member formed in the tube (11) shape formed in the forming step in a tube insertion port (32a) of the tank portion (3);
After the arrangement step, a heat exchanger manufacturing method comprising a joining step of brazing and joining the plate-like member having the tube (11) shape and the tank portion (3),
In the molding step, on the end side in the long axis direction (X) of the flat shape, while conveying both edges (112, 113) of the plate-like member from both sides, it is conveyed in the direction of the internal fluid passage, An engaging portion (111) that engages within a width (W2) narrower than the width (W1) of the flat minor axis direction (Y) is formed, and an outer peripheral surface (111a) of the engaging portion (111) is formed. A method for manufacturing a heat exchanger, wherein the heat exchanger is molded so as to have a substantially smooth surface.   In the molding step, the both edge portions (112, 113) of the plate-like member are plastically deformed so that the outer peripheral surface (111a) of the engagement portion (111) is formed into a substantially smooth surface. The manufacturing method of the heat exchanger of Claim 7 characterized by these.   In the molding step, the two edge portions (112, 1311) of the plate-like member are overlapped with the respective end portions (114, 115) aligned, and the outer peripheral surface (111a) of the engaging portion (111B). The heat exchanger manufacturing method according to claim 7, wherein the heat exchanger is shaped so as to have a substantially smooth surface.   In the molding step, at least one end (115) of the both edge portions (112, 113) of the plate-like member is chamfered, and the outer peripheral surface (111a) of the engaging portion (111C) is substantially smooth. The method for manufacturing a heat exchanger according to claim 7, wherein the heat exchanger is shaped to be a surface. In the molding step,
The plate-like shape having an inclined surface (117) that is inclined so that the portion adjacent to the engaging portion (111C) is separated from the engaging portion (111C) so that the width in the minor axis direction (Y) increases. While molding the parts,
The end portion (115) of the plate-like member is chamfered along the inclined surface (117), and the outer peripheral surface (111a) of the engaging portion (111C) is formed to be a substantially smooth surface. The manufacturing method of the heat exchanger of Claim 10 characterized by the above-mentioned. Bending the plate-like member, comprising a forming step of forming into a tube (11) shape so that the cross section becomes a flat shape,
A method for producing a heat exchanger tube for inserting an end portion into a tube insertion port (32a) of a tank portion (3) and brazing and joining the tank portion (3),
In the molding step, on the end side in the long axis direction (X) of the flat shape, while conveying both edges (112, 113) of the plate-like member from both sides, it is conveyed in the direction of the internal fluid passage, The engaging portion (111) that engages within the width (W2) narrower than the width (W1) in the end-axis direction (Y) of the flat shape is formed, and the outer peripheral surface (111a) of the engaging portion (111) is A method for producing a tube for a heat exchanger, wherein the tube is molded so as to have a substantially smooth surface.

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