JP6197338B2 - Heat exchanger - Google Patents

Description

  The present invention relates to a parallel flow heat exchanger that is disposed in front of an engine room of a vehicle and includes an inner fin tube as a porous tube.

  In a heat exchanger applied to a refrigerant condenser of an automotive air conditioner, both sides of a plurality of perforated pipes manufactured by extrusion molding are inserted into a header plate of a header tank at a predetermined interval, and the perforated pipe and the perforated pipe are inserted. A structure in which outer fins for heat dissipation are provided between the tubes has been adopted. However, in recent years, due to the cost reduction of heat exchangers, the most costly perforated pipe is formed by bending a strip plate material instead of extrusion molding to form a tube, and plate molding in which inner fins are provided, thereby simplifying the manufacturing method, It is being attempted to reduce the cost by reducing the weight.

  A perforated tube formed by plate molding in which a strip-shaped plate material is bent to form a tube and an inner fin is provided therein is called an inner fin tube, and a heat exchanger employing such an inner fin tube is disclosed in Patent Document 1. . The biggest advantage of inner fin tube manufacturing by strip molding of strip-shaped plate materials is that it is easy to reduce the weight depending on the setting of the plate thickness, and the degree of freedom of molding is larger than the extrusion molding method, so heat exchange by expanding the heat transfer area etc. The heat exchange performance of the vessel can be improved.

  The heat exchanger using the inner fin tube shown in Patent Document 1 and the like is used for a vehicle air conditioner, and its configuration is simplified and shown in FIG. The heat exchanger 1 includes a core portion 2, an inlet side header tank 3, and an outlet side header tank 4, and the constituent members are brazed to each other. In the core portion 2, a plurality of inner fin tubes 10 and a plurality of outer fins 20 are alternately stacked, and side plates 25 as reinforcing members are disposed at both ends in the stacking direction (vertical direction in the figure). Has been. In the heat exchanger 1, the refrigerant flowing inside the inner fin tube 10 is cooled by the blown air that passes through the core portion 2.

  In this example, separators 26 are provided inside the inlet-side header tank 3 and the outlet-side header tank 4, and caps 23 and 24 that close the opening of the header tank are brazed to both ends. Is provided. The insides of the inlet side header tank 3 and the outlet side header tank 4 are partitioned into a plurality of spaces by separators 26. The inlet-side header tank 3 has a refrigerant inlet 21, and the outlet-side header tank 4 has a refrigerant outlet 22. The refrigerant flowing into the heat exchanger 1 from the inlet 21 flows through the inside of the inlet side header tank 3 and the outlet side header tank 4 and the inside of the inner fin tube 10 partitioned by the separator 26 as indicated by broken lines. And discharged from the outlet 22. In addition, the number of the inner fin tubes 10 and the number of the separators 26 shown in FIG. 1 are examples, and do not indicate the number in the actual heat exchanger 1 and the flow path of the refrigerant.

  FIG. 2 explains the internal configuration of the inner fin tube 10 of the heat exchanger 1 shown in FIG. 1 and the flow path of the refrigerant flowing inside. The inner fin tube 10 is formed by inserting an inner fin 12 having a wavy cross section into a tube 11. The tube 11 has a flat cross section (a shape close to an oval shape) perpendicular to the longitudinal direction (the direction of the refrigerant flow path) by bending a thin (for example, 0.2 mm thick) aluminum strip. It is the formed pipe member.

  Specifically, the tube 11 has a curved end portion 11a formed by curving the central portion of the belt-like plate material in an arc shape, and a parallel portion 11p is provided extending from the curved end portion 11a. The curved end of the parallel portion 11p is provided. A crimping portion 11b is provided at the end opposite to the portion 11a. At this time, both ends of the belt-like plate material are different in length from the curved end portion 11a in order to caulk in the caulking portion 11b. The inner fin 12 is formed into a wave shape by rolling a thin (for example, 0.1 mm thick) aluminum strip like the tube 11, and flat plate portions 15 and 16 are provided at both ends. The folded portion 14 of the corrugated portion of the inner fin 12 is brazed to the inner wall surface 13 of the tube 11, and the end portion of the flat plate portion 16 is also brazed to the inner wall surface 13 of the curved end portion 11a. On the other hand, the end portion of the other flat plate portion 15 of the inner fin 12 is caulked at the caulking portion 11 b and coupled to the tube 11.

  FIG. 3 shows a state in which the inner fin tube 10 shown in FIG. 2 is connected to the header tank of the heat exchanger 1 shown in FIG. 1, for example, the outlet side header tank 4. The outlet side header tank 4 is formed by joining a header plate 41 into which the inner fin tube 10 is inserted and a tank plate 42. The tip of the inner fin tube 10 is inserted through the header plate 41 and protrudes into the space in the outlet side header tank 4. 4 is a view of the outlet-side header tank 4 shown in FIG. A brazing material is disposed on the header plate 41 and the tank plate 42, and the tip of the inner fin tube 10 inserted into the header plate 41 is attached to the header plate 41 by the brazing material disposed on the header plate 41 and the tank plate 42. It is brazed.

JP 2007-125590 A

  However, when the tip of the inner fin tube 10 is brazed to the header plate 41 with the brazing material disposed on the header plate 41 and the tank plate 42, the brazing material on the header plate 41 flows into the inner fin tube 10 and the tube melts. There was a problem to do. Further, as shown in FIG. 5, the brazing material flows into the header plate 31 through the separator 26 and flows into the inner fin tube 10 in the portion where the separator 26 is in the header tank (here, the inlet side header tank 3). There was a problem that tube melting occurred.

  Here, tube melting will be described in detail. FIG. 6 shows the vicinity of the crimped portion 11b of the inner fin tube 10 that has been normally brazed. The tube 11 has a parallel portion 11p, and the belt-like plate material is folded at a point of the same length from a curved end portion (not shown) to form an inclined portion 11c. The inclined portion 11c is valley-folded at a portion where the strip-shaped plate material collides, and the strip-shaped plate member 15 is sandwiched between the long end portion 11e and the short end portion 11f of the strip-shaped plate member. The edge part 11e of a board | plate material is return | folded by the edge part 11f side, and the crimping part 11b is formed. In this example, the end portion 15a of the flat plate portion 15 protrudes from the shorter end portion 11f of the strip-shaped plate member, and the shorter end portion 11f of the strip-shaped plate member is formed by the longer end portion 11e of the folded strip-shaped plate member. It is bent to the side.

  The longer end portion 11e of the strip-shaped plate member and the inclined portion 11c are brazed with the brazing material 51, and the flat plate portion 15 of the inner fin 12 and the inner surface of the inclined portion 11c are brazed with the brazing material 52. The folded portion 14 of the inner fin 12 and the inner wall surface 13 of the tube 11 are brazed with a brazing material 53. FIG. 7 shows a state in which the tube melt 5 has occurred in the caulking portion 11b of the inner fin tube 10 shown in FIG. When the tube melt 5 occurs, the thickness of the tube 11 becomes thin, and the tube 11 has a hole at the tube melt 5 portion, causing a problem that the refrigerant leaks.

  FIG. 8 shows another example of the inner fin tube 10. The inner fin tube 10 has an inner fin 12 inside, and the tube 11 is caulked at the crimping portion 12 and closed. FIG. 9 is a diagram illustrating a state in which tube melts 6 and 7 are generated in the crimped portion 11b of the inner fin tube 10 illustrated in FIG. In this way, even if the shape of the inner fin tube is different, if brazing material is placed on the header tank side, the brazing material flows into the inner fin tube through the header plate when brazing the inner fin tube, and the tube melts. There was a problem that occurred.

  Since the flow of brazing material into the inner fin tube is caused by the level difference in the crimped part of the bent tube, measures have been taken so far to weld and join the crimped part or reduce the level difference in the crimped part. Has been made. However, each measure leads to an increase in cost, and a special process for tightening brazing temperature control is required, which is not sufficient as a measure for preventing the brazing material from flowing into the inner fin tube.

  In view of the above problems, the present invention prevents the tube from melting at the time of mounting the tube to the header tank in the heat exchanger that is brazed after the tube is inserted into the header tank and assembled. A heat exchanger that can be improved is provided.

  In order to solve the above problems, the present invention includes a plurality of tubes (11) each having a refrigerant passage therein, and a pair of header tanks (3, 4) to which end portions of the tubes (11) are brazed. In the heat exchanger (1) having the above, a brazing material (8) used for brazing the header tank (3, 4) is disposed on the outer peripheral surface of the tube (11), and the header tank (3, 4 ), The metal plate material forming the header tank (3, 4) is exposed on the inner and outer peripheral surfaces.

  According to the heat exchanger of the present invention, since the brazing material necessary for brazing the tube and the header tank is supplied from the outer peripheral surface of the tube, melting of the tube during brazing is prevented, and the productivity of the heat exchanger is increased. Will improve.

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

It is a front view which shows the simplified structure of the heat exchanger of a comparison technique. It is a perspective view which shows the inner fin tube used for the heat exchanger shown in FIG. FIG. 3 is a partial perspective view of the heat exchanger showing a state in which the inner fin tube shown in FIG. 2 is connected to the header plate of the header tank of the heat exchanger shown in FIG. 1. It is sectional drawing which looked at the header tank shown in FIG. 3 from the arrow L direction. It is a fragmentary perspective view which shows a mode that the brazing | wax material of a tank plate flows into a header plate via a separator, and a brazing | wax material flows in into an inner fin tube. It is a partial expanded sectional view which shows the crimping part of the inner fin tube by which brazing was performed normally. FIG. 7 is a partial enlarged cross-sectional view showing a state in which tube melting has occurred in the crimped portion of the inner fin tube shown in FIG. 6. It is sectional drawing which shows another example of an inner fin tube. It is a partial expanded sectional view which shows the state which tube melting generate | occur | produced in the crimping part of the inner fin tube shown in FIG. It is sectional drawing of the inner fin tube of the 1st Example of this invention. It is a partial expanded sectional view which shows the part of the crimping part of the inner fin tube of FIG. (A) is a cross-sectional view of a brazing material-less header plate and tank plate used in a heat exchanger together with the inner fin tube of the first embodiment of the present invention, and (b) is a brazing-material-less header shown in (a). Sectional drawing of the modification of 1st Example which has sacrificial material on the outer side of the header plate of a plate and a tank plate, (c) is the separator of the header tank of the inlet side and outlet side which are provided with the header plate and tank plate of brazing material-less The partial perspective view of the heat exchanger which shows the Example which provided the brazing material in one side of (a), (d) is sectional drawing of the Example whose inlet side and outlet side header tanks are integrated, and a cross section is circular, e) is a cross-sectional view of an embodiment in which the inlet side and outlet side header tanks are integrated, and the cross section is elliptical, and (f) is an embodiment in which the inlet side and outlet side header tanks are integrated and the cross section is atypical. Sectional view of ( ) Is an enlarged view of an essential portion X of (b). FIG. 6 is an assembled perspective view of a header plate and a brazing material-less separator used therein, showing a second embodiment of the present invention. It is an assembly perspective view of a header plate and a brazing material-less separator used therefor, showing a modification of the second embodiment of the present invention. It is the sectional side view and front view which show the 1st specific example of the separator of the 3rd Example of this invention. It is the sectional side view and front view which show the 2nd specific example of the separator of the 3rd Example of this invention. It is the sectional side view and front view which show the 3rd specific example of the separator of the 3rd Example of this invention. It is a front view which shows the 4th specific example of the separator of the 3rd Example of this invention. It is a front view which shows the 5th specific example of the separator of the 3rd Example of this invention. It is a front view which shows the 6th specific example of the separator of the 3rd Example of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. About each embodiment, the same code | symbol is attached | subjected to the part of the same structure, and the description is abbreviate | omitted. In each embodiment of the present invention, parts having the same configuration are denoted by the same reference numerals with respect to the comparative technique on which the present invention is based, and the description thereof is omitted.

  FIG. 10 shows the inner fin tube 10 of the first embodiment of the present invention. FIG. 11 is an enlarged view of a portion X in FIG. The inner fin tube 10 is formed by bending a belt-shaped plate material and accommodates the inner fin 12 therein. The belt-like plate material is formed of thin-walled aluminum (for example, 0.2 mm in thickness), and is bent into an arc shape at a slightly different distance from both end portions to form the curved end portion 11a. The belt-like plate material is bent until it becomes parallel to form a parallel portion 11p. Both end portions of the belt-shaped plate material are mountain-folded at the same distance from the curved end portion 11a, and after the inclined portion 11c having a predetermined length is formed, the both ends are parallel.

  The belt-like plate material is bent as described above to be formed into a flat tube 11, and the inner fin 12 is housed inside to form a flat medium flow path. The inner fin 12 is formed into a wave shape by rolling a thin (for example, 0.1 mm thick) aluminum strip like the tube 11, and flat plate portions 15 and 16 are provided at both ends. The folded portion 14 of the corrugated portion of the inner fin 12 is brazed to the inner wall surface 13 of the tube 11, and the end portion of the flat plate portion 16 is also brazed to the inner wall surface 13 of the curved end portion 11a. On the other hand, the end portion of the other flat plate portion 15 of the inner fin 12 is sandwiched between two end portions that are folded in parallel and parallel to each other.

  In the first embodiment, the two end portions 11e and 11f of the belt-like plate member sandwiching the flat plate portion 15 of the inner fin 12 are longer in the end portion 11e than in the end portion 11f. Therefore, the end portion 11e is bent toward the end portion 11f side with the flat plate portion 15 and the end portion 11f being sandwiched, and is caulked and joined to form the crimped portion 11b. In the first embodiment, the brazing material 8 is disposed (clad) over the entire outer surface of the inner fin tube 10 formed as described above. As shown in FIG. 3, the amount of the brazing material 8 is such that when the inner fin tube 10 is brazed by being inserted into the inlet side and outlet side header tanks 3 and 4 as shown in FIG. And the amount necessary for brazing the outlet side header tanks 3 and 4.

  In this case, the inner peripheral surface N and the outer peripheral surface S of the header plates 31 and 41 constituting the inlet side header tank 3 and the outlet side header tank 4 are made of no brazing material as shown in FIG. That is, the metal plate material that forms the header plates 31 and 41 can be a plate material (bare material) with the fabric (base material) exposed, and a single layer material in which the brazing material is not disposed. With this configuration, a sufficient amount of brazing material 8 clad on the outer surface of the inner fin tube 10 is used for joining the inner fin tube 10 to the inlet side and outlet side header tanks 3 and 4 (FIG. 10). , See FIG. 11). Since the brazing material does not exist in the tank plates 32 and 42, the brazing material does not flow from the tank plates 32 and 42 to the inner fin tube 10, and the inner fin tube 10 does not melt. As a result, the stability during brazing of the inner fin tube 10 is improved, and the brazing temperature application range can be expanded.

  As described above, the brazing material flowing into the inner fin tube 10 is a sufficient amount of brazing material 8 clad on the entire outer surface of the inner fin tube 10. For this reason, the amount of brazing material supplied to the brazing portion of the inner fin tube 10 is sufficient, and the brazing fillet of the inner fin tube 10 can be increased. Then, a fillet corresponding to the amount of brazing material of the part itself is formed, and brazing performance of parts other than the inner fin tube 10 is improved.

  Here, the brazing material in the inlet side and outlet side header tanks 3, 4 flows into the inner fin tube 10, and the brazing material in the inlet side and outlet side header tanks 3, 4 and the brazing of the inner fin tube 10 are connected. Consider the case of comparative technology. In this case, the fillet radius of the fillet formed on the inner fin 12 and the fillet radius formed on the tank plate 32 and the header plate 31 are substantially equal. However, in this case, since the amount of brazing material in the inlet side and outlet side header tanks 3 and 4 is small, the size of the fillet radius of the tank plate 32 and the header plate 31 is the size of the fillet formed in the inner fin 12. It becomes about 0.1 mm which is the same as the fillet radius. That is, the size of the fillet radius formed in the tank plate 32 and the header plate 31 becomes very small, and the gap between the brazing required portions cannot be filled, leading to leakage.

  On the other hand, when the inner peripheral surface N and the outer peripheral surface S of the header plates 31 and 41 are made of no brazing material, the brazing material of the fillet formed between the tank plate 32 and the header plate 31 and the fillet 52 formed on the inner fin 12 can be used. And the connection with 53 brazing materials can be cut off. As a result, a large fillet can be formed at the junction between the tank plate 32 and the header plate 31 and at the junction between the tank plate 32 and the cap 24. That is, a large fillet with a fillet radius of about 0.3 mm to 0.6 mm, which can be originally formed, can be formed at the junction between the tank plate 32 and the header plate 31 and the junction between the tank plate 32 and the cap 24, and the gap can be easily filled. Brazeability is improved. In addition, the magnitude | size of the fillet radius said here assumes the case where the brazing material in which the amount of Si generally used is 10 weight% is used.

  In addition, an anticorrosion layer or a sacrificial brazing material in which a brazing material layer is stacked may be disposed on the surface of the inner fin tube 10, but by making the header plates 31 and 41 brazing material-free, the inlet side or Since the inflow of the brazing material from the outlet side header tanks 3 and 4 can be prevented, the inflow of the brazing material to the surface of the inner fin tube 10 can also be prevented. Since the brazing material hinders the function of the anticorrosion layer, the corrosion resistance of the inner fin tube 10 can be improved by preventing the brazing material from flowing into the surface of the inner fin tube 10.

  In addition, the header plates 31 and 41 are made of a metal material that does not include a brazing material as the material of the header plates 31 and 41, and the header plates 31 and 41 are made of no brazing material. A sacrificial material which is a low anticorrosion layer can be provided. FIG. 12B shows an embodiment in which a sacrificial material (corrosion protection layer) 9 is provided on the outer peripheral surface S of the header plates 31 and 41. In this case, as shown in FIG. 12G, as the header plates 31 and 41, the surface of the metal plate material (for example, made of aluminum alloy) on the inner peripheral surface N side is in a state where the base materials 311 and 411 are exposed, The surface of the metal plate material on the outer peripheral surface S side of the header plates 31 and 41 may be in a state in which the sacrificial material 9 is clad on the surfaces of the base materials 311 and 411. Further, as shown in FIG. 12C, the header plates 31 and 41 are made of no brazing material, but the brazing material 8 may be provided on one side or both sides of the separator 26. In FIG. 12C, the brazing material 8 is shown with halftone dots.

  Furthermore, the inner peripheral surface N and the outer peripheral surface S of the inlet side and outlet side header tanks 3 and 4 are made of no brazing material, so that the inlet side and outlet side header tanks 3 and 4 have header plates 31 and 41 and tank plates 32 and The present invention can also be applied to an integrated pipe 30 that is not divided into 42. The cross-sectional shape of the integral pipe 30 used for the inlet side or outlet side header tanks 3 and 4 is a circle shown in FIG. 12 (d), an ellipse shown in FIG. 12 (c), and FIG. 12 (f). This is effective regardless of the cross-sectional shape. And even when the inlet side and outlet side header tanks 3 and 4 are formed by an integral pipe 30, the material for forming the tank may be a single layer type in which the metal is exposed. A sacrificial material (anticorrosion layer) 9 having a low potential may be provided on at least one of the outer peripheral surfaces S. 12 (d) to 12 (f), the sacrificial material 9 is provided on the inner peripheral surface N of the pipe 30 shown in FIG. 12 (e). The sacrificial material 9 is provided on the outer peripheral surface S of the pipe 30 shown in 12 (f).

  Note that the sacrificial material 9 is provided on the outer peripheral surface S of the pipe 30 shown in FIG. 12E even in the inlet side and outlet side header tanks 3 and 4 shown in FIGS. 12D to 12F. Needless to say, the sacrificial material 9 may be provided on the inner peripheral surface N of the pipe 30 shown in FIG. Whether the sacrificial material 9 is provided on the inner peripheral surface N or the outer peripheral surface S of the pipe 30 does not depend on the shape or structure of the pipe 30. The sacrificial material 9 may be provided on both the inner peripheral surface N and the outer peripheral surface S of the pipe 30.

  FIG. 13 shows a second embodiment of the heat exchanger of the present invention. In the second embodiment, the inlet side header plate 31 and the outlet side header plate 41 are made of no brazing material, and the separator 26 attached as a partition wall inside the inlet side header tank 3 and the outlet side header tank 4 is used as a brazing material. It is a less. The separator 26 of the second embodiment is used when the header plates 31 and 41 have holes 33 and 43 (the inlet header tank 3 has holes 33 and the outlet header tank 4 has holes 43). Is. That is, the metal plate material forming the separator 26 is a plate material (bare material) with the cloth exposed, and no brazing material is disposed.

  In this arrangement, there is no brazing material in the header plates 31 and 41 and the separator 26, but the brazing material disposed in the tank plates 32 and 42 is supplied, so that the brazing between the header plates 31 and 41 and the separator 26 is performed. Can be attached. The tank braze flows and brazes through a minute gap formed between the separator 26 and the header plates 31 and 41. In this case, a brazing material having a Si amount of 6% by weight or more is suitable for the brazing material of the tank plates 32 and 42.

  FIG. 14 shows a modification of the separator 26 of the second embodiment of the present invention shown in FIG. The separator 26 according to the modified example is used when the header plates 31 and 41 have grooves 34 and 44 on both sides (the groove 34 on the inlet side header tank 3 and the groove 44 on the outlet side header tank 4). It is. Also in the modification of the second embodiment, the metal plate material forming the separator 26 is a plate material (bare material) with the cloth exposed, and no brazing material is disposed. Further, in the modification of the second embodiment, the holes on the joining side of the inner fin tubes of the header plates 31 and 41 are eliminated, and grooves 34 and 44 for attaching the separators 26 on both sides of the header plates 31 and 41 are provided. Provided. For this reason, the inflow path | route of the brazing material from the outer side of the header plates 31 and 41 is interrupted | blocked.

  Thus, if the metal plate material forming the separator 26 is made of a brazing material-less material in which the brazing material is not disposed as the plate material with the cloth exposed, the path of the brazing material to the header plates 31 and 41 can be blocked. The occurrence of tube melting is further reduced.

  FIGS. 15 to 17 show the configuration of the separator 26 of the third embodiment of the heat exchanger of the present invention. In each figure, a sectional view and a front view of the separator 26 are shown. In the third embodiment, when brazing material is disposed on both sides of the inlet side header tank 3 and the outlet side header tank 4, brazing material reservoir structures are provided on both sides of the separator 26, and the brazing material is connected to the inner fin tube 10. This prevents inflow of the material.

  FIG. 15 shows a first specific example of the separator 26, and shows the same type of separator 26 as the separator 26 described in FIG. In the first specific example of the separator 26, a plurality of parallel grooves 27 are provided on both surfaces of the separator 26. FIG. 16 shows a second specific example of the separator 26, and shows the same type of separator 26 as the separator 26 described in FIG. In the second specific example of the separator 26, a plurality of circular depressions 28 regularly arranged vertically and horizontally are provided on both surfaces of the separator 26, and the depressions 28 are wax reservoirs in which molten wax is accumulated. The depressions 28 may be provided in an irregular manner. FIG. 17 shows a third specific example of the separator 26, and shows the same type of separator 26 as the separator 26 described in FIG. In the third specific example of the separator 26, a plurality of oval depressions 29 regularly arranged vertically and horizontally are provided on both surfaces of the separator 26. The long holes 29 may be provided irregularly.

  As described above, if grooves and holes are provided on both surfaces of the separator 26, even if the brazing material is disposed on both surfaces of the inlet side header tank 3 and the outlet side header tank 4, the excess brazing material is removed from the grooves and holes. It is possible to prevent the excess brazing material from flowing to the header plate side. As a result, excess brazing material does not flow into the inner fin tube, and tube melting can be prevented.

  FIGS. 18 to 20 show fourth to sixth specific examples of the separator 26 of the third embodiment of the heat exchanger of the present invention. In the fourth specific example shown in FIG. 18, grooves 35 are provided on both surfaces of the separator 26 so as to separate the brazing filler material flow paths obliquely. The groove 35 is provided asymmetrically in the separator 26. The groove 35 may be a rib. In the fifth specific example shown in FIG. 19, grooves 36 are provided on both surfaces of the separator 26 to separate the brazing filler material flow paths symmetrically with respect to the center line of the separator 26. The groove 36 may be a rib. In the sixth specific example shown in FIG. 20, in addition to the grooves 36 described in the fifth embodiment, the brazing material flow paths are separated diagonally and symmetrically with respect to the center line of the separator 26 on both sides of the separator 26. Ribs 37 are provided. The rib 37 may be a groove.

  The brazing material that causes melting of the tube flows into the inner fin tube through the separator 26 and the brazing portion inside the tank. Therefore, as shown in the first to sixth specific examples, by providing grooves 36 or ribs 37 on both surfaces of the separator 26, the amount of brazing material flowing into the inner fin tube through the separator 26 from the inside of the tank can be reduced. Can be delayed. That is, the flow path from the inside of the tank to the inner fin tube can be extended by the grooves 36 or ribs 37 provided on both surfaces of the separator 26, and the time for the brazing material to reach the inner fin tube due to the large flow resistance of the brazing material. Can be delayed. As a result, the temperature difference from the core portion can be reduced before the brazing material reaches the inner fin tube, and the melting of the tube is reduced.

  In the embodiment described above, the type and film thickness of the brazing material that are actually suitable for use are brazing materials having a Si amount of 4 wt% to 5 wt%, and the clad rate is 20% (plate thickness t0.2 mm). Therefore, the film thickness can be 40 μm). However, the brazing material clad on the tube surface in the present invention may be a 10% by weight brazing material that is usually used, or a tube in which a brazing material having a clad rate of about 10% (film thickness 20 μm) is disposed. But it is effective. That is, a tube having a brazing filler metal 8 on the tube surface with an amount of Si of 3.5 wt% to 10 wt% is also effective. However, the Si amount of the brazing material 8 on the tube surface is preferably 3.5% by weight to 7.5% by weight.

  As described above, according to the present invention, in a heat exchanger that employs a tube manufactured by plate bending, the brazing material necessary for brazing the tube is supplied from the outer peripheral surface of the tube. Tube melting during brazing is prevented, and the productivity of the heat exchanger is improved. Further, by eliminating the brazing material in the separator provided in the header tank or providing the separator with a brazing material reservoir structure, melting of the tube during brazing of the tube to the header tank is prevented. Further, by combining the first to third embodiments described above, it is possible to further reduce the melting of the tube when brazing the tube to the header tank.

  In addition, although the Example which used the tube which distribute | arranged the inner fin inside as the tube brazed to a header plate was described in the Example mentioned above, you may use the tube in which the inner fin is not distribute | arranged. In particular, as a tube to be brazed to the header plate, if the plate material is bent and molded and the ends are bonded together, the brazing material is sucked into the bonded portion by capillary action, so the brazing material is near the bonded portion. However, it is possible to prevent melting of the tube by applying the present invention.

  In the above-described embodiments, examples of using aluminum as the material of the inner fin tube and the inner fin are described. However, in all the embodiments described above, an aluminum alloy is used as the material of the inner fin tube and the inner fin. Can do.

DESCRIPTION OF SYMBOLS 1 Heat exchanger 2 Core part 3 Inlet side header tank 4 Outlet side header tank 8 Brazing material 10 Inner fin tube 11 Tube 11b Caulking part 12 Inner fin 20 Outer fin 26 Separator 27 Groove 28, 29 Hole 35, 36 Groove 37 Rib

Claims (11)

In the heat exchanger (1) having a plurality of tubes (11) having refrigerant passages therein and a pair of header tanks (3, 4) to which the ends of the tubes (11) are brazed,
The tube (11) has a curved end portion (11a) formed by bending a strip-shaped plate material at a portion where the distance from both ends thereof is different, and a longer end portion is bonded to the shorter end portion side. Having a joined part (11b),
A brazing material (8) used for brazing the joint (11b) and brazing the header tank (3, 4) is disposed on the outer peripheral surface of the tube (11),
The metal plate material forming the header tank (3, 4) is exposed on the inner peripheral surface and the outer peripheral surface of the header tank (3, 4) ,
The header tank (3, 4) has a header plate (31, 41) to which the tube (11) is brazed and a tank plate (32, 42) to be assembled to the header plate (31, 41). The heat exchanger is characterized in that the metal plate material forming the header plates (31, 41) is exposed . In the heat exchanger (1) having a plurality of tubes (11) having refrigerant passages therein and a pair of header tanks (3, 4) to which the ends of the tubes (11) are brazed,
The tube (11) has a curved end portion (11a) formed by bending a strip-shaped plate material at a portion where the distance from both ends thereof is different, and a longer end portion is bonded to the shorter end portion side. Having a joined part (11b),
A brazing material (8) used for brazing the joint (11b) and brazing the header tank (3, 4) is disposed on the outer peripheral surface of the tube (11),
The metal plate material forming the header tank (3, 4) is exposed on the inner peripheral surface and the outer peripheral surface of the header tank (3, 4),
The header tanks (3, 4) have an inlet-side header tank (3) into which refrigerant flows and an outlet-side header tank (4) from which refrigerant flows out, at least the inlet-side header tank (3) or the outlet The heat | fever characterized by the fabric | dough of the metal plate material which forms the said separator (26) exposed on both surfaces of the separator (26) which is a partition plate attached to the inside of either one of a side header tank (4) Exchanger . The header tanks (3, 4) have an inlet-side header tank (3) into which refrigerant flows and an outlet-side header tank (4) from which refrigerant flows out, at least the inlet-side header tank (3) or the outlet both surfaces of the separator is a partition plate attached to the inside of either side header tank (4) (26), wherein characterized in that the fabric of the metal sheet forming the separator (26) is exposed Item 2. The heat exchanger according to Item 1 . The tube (11) is provided with an inner fin (12) having a wave shape inside,
The tube (11) has a parallel portion (11p) formed in the folded plate material, and the longer end portion (11e) of both end portions of the strip-shaped plate material is folded back to the shorter end portion (11f) side. And is formed into a flat shape by being joined by a joined portion (11b) joined after
The folded portion (14) of the corrugated portion of the inner fin (12) is brazed to the inner wall surface (13) of the tube (11), and a flat plate portion (15) is formed at the other end to form the joint portion ( The heat exchanger according to any one of claims 1 to 3 , wherein the heat exchanger is combined with the tube (11) by being sandwiched between the strip-shaped plate members in 11b). The heat exchanger according to any one of claims 1 to 3 , wherein an outer fin (20) for heat dissipation is disposed outside the plurality of tubes (11). The heat according to any one of claims 1 to 3 , wherein the amount of Si in the brazing material (8) disposed on the outer peripheral surface of the tube (11) is 3.5 wt% to 10 wt%. Exchanger. The amount of Si of brazing material (8) arrange | positioned at the outer peripheral surface of the said tube (11) is 3.5 weight%-7.5 weight%, Any one of Claim 1 to 3 characterized by the above-mentioned. Heat exchanger. In the heat exchanger (1) having a plurality of tubes (11) having refrigerant passages therein and a pair of header tanks (3, 4) to which the ends of the tubes (11) are brazed,
The tube (11) has a curved end portion (11a) formed by bending a strip-shaped plate material at a portion where the distance from both ends thereof is different, and a longer end portion is bonded to the shorter end portion side. Having a joined part (11b),
A brazing material (8) used for brazing the joint (11b) and brazing the header tank (3, 4) is disposed on the outer peripheral surface of the tube (11),
The metal plate material forming the header tank (3, 4) is exposed on the inner peripheral surface and the outer peripheral surface of the header tank (3, 4),
The header tank (3, 4) includes a pipe (30) in which a header plate to which the tube (11) is brazed and a tank plate to be assembled to the header plate are integrated, and the pipe (30 heat exchangers, wherein at least one is a low anticorrosion layer of potential犠材(9) is provided for) the inner circumferential surface of the metal sheet forming the (N) and the outer peripheral surface (S). In the heat exchanger (1) having a plurality of tubes (11) having refrigerant passages therein and a pair of header tanks (3, 4) to which the ends of the tubes (11) are brazed,
The tube (11) has a curved end portion (11a) formed by bending a strip-shaped plate material at a portion where the distance from both ends thereof is different, and a longer end portion is bonded to the shorter end portion side. Having a joined part (11b),
A brazing material (8) used for brazing the joint (11b) and brazing the header tank (3, 4) is disposed on the outer peripheral surface of the tube (11),
  The metal plate material forming the header tank (3, 4) is exposed on the inner peripheral surface and the outer peripheral surface of the header tank (3, 4),
The header tanks (3, 4) have an inlet-side header tank (3) into which refrigerant flows and an outlet-side header tank (4) from which refrigerant flows out, at least the inlet-side header tank (3) or the outlet A heat exchanger characterized in that a brazing material (8) is provided on at least one surface of a separator (26) which is a partition plate attached to one of the side header tanks (4). The header tanks (3, 4) have an inlet-side header tank (3) into which refrigerant flows and an outlet-side header tank (4) from which refrigerant flows out, at least the inlet-side header tank (3) or the outlet the at least one surface of the separator (26) is a partition plate attached to the inside of either side header tank (4), in claim 8, characterized in that the brazing material (8) is provided The described heat exchanger. Cross-sectional shape of the pipe (30) is circular, elliptical, and the heat exchanger mounting serial to claim 8, characterized in that either variant.

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