JP2007322020A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger capable of preventing clogging of fine fluid flow channels with a brazing filler metal caused by flowing of excess molten brazing filler metal. <P>SOLUTION: In this heat exchanger constituted by alternately stacking a number of tube elements 3 incorporating corrugated inner fins 17 forming a number of fine fluid flow channels by joining corrugated top portions 17A to an inner face of a tube material 7, and a number of outer fins 5 joined to outer faces of the tube elements 3 in an internal flow channel of the tube material 7, and joining the tube material 7 and the corrugated inner fin 17 constituting the tube element 3, and the tube elements 3 and the outer fins 5 to each other by brazing, a blocking portion 35 for blocking the flow of the molten brazing filler metal flowing along a joining part of the corrugated top portions 17A, is formed on an end portion along the longitudinal direction of the corrugated top portions 17A of the corrugated inner fins 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a heat exchanger that can be widely applied to an evaporator, a condenser, and the like for a refrigeration / air conditioner, and more particularly to a heat exchanger that is suitable as an evaporator and a condenser for a vehicle air conditioner.

As an example of the heat exchanger as described above, there are the following stacked heat exchangers.
The laminated heat exchanger has two tanks formed by molding an aluminum plate clad with a brazing material, a tank part for flowing fluid into and out of the tank part, and an internal flow path connected to the tank part. A flat tube material is formed by integral formation. In the internal flow path of the tube material, a corrugated top portion is joined to the inner surface of the tube material, so that corrugated inner fins made of aluminum that form a large number of microfluidic flow paths are housed to constitute a tube element. A large number of aluminum outer fins that are joined to the tube element and the outer surface side of the tube element are alternately stacked, and the tank portions of adjacent tube elements are communicated with each other so that fluid can flow in and out ( For example, see Patent Documents 1 and 2).

  Such a laminated heat exchanger made of aluminum is usually placed in a furnace in a state where a tube material, a corrugated inner fin and an anter fin, which are formed by abutting two molding materials, are temporarily assembled using a jig. Manufactured by brazing and joining molded materials, tube materials and corrugated inner fins, tank portions of adjacent tube elements, and tube elements and outer fins to each other in a furnace.

JP 2005-221155 A JP 2006-3025 A

  With regard to heat exchangers used in vehicle air conditioners, in recent years, the need for high performance, small size, light weight, and compactness has become increasingly strong, and therefore, heat transfer performance has been further improved. As one of the measures to improve the heat transfer performance, the corrugated inner fin is used to increase the heat transfer area and to make the fine fluid flow path (refrigerant flow path) finer in the internal flow path of the tube material as described above. The one with interior is used a lot.

The corrugated inner fin installed in the internal flow path of the tube material needs to be brazed and joined to the inner surface of the tube material in order to ensure the pressure resistance as a tube element. Due to the tendency to become finer, when brazing, the molten brazing material excessively flows into the microfluidic flow path, reducing the cross-sectional area of the flow path, or sometimes blocking the fluid flow path. In some cases, this could hinder performance improvement.
One of the factors is that excessive molten brazing material flows excessively from the tank portion provided at at least one end of the tube element into the microfluidic flow path. The tank part has a larger area of the non-joined part relative to the joined part than the core part side of the tube element, and the amount of brazing material is excessive, so that surplus brazing material is easily generated. This surplus brazing material melts during brazing and excessively flows into the joint between the corrugated top of the corrugated inner fin on the core side of the tube element and the inner surface of the tube material due to capillarity, resulting in brazing of the microfluidic flow path This is thought to be the cause of this.

  The present invention has been made in view of such circumstances, and even if the microfluidic flow path is further miniaturized by incorporating a corrugated inner fin in the tube material, an excessive molten brazing filler metal is microfluidic. It is an object of the present invention to provide a heat exchanger that can prevent clogging of a microfluidic channel due to flowing into the channel and achieve further high performance, small size, light weight, and compactness.

In order to solve the above problems, the heat exchanger of the present invention employs the following means.
That is, the heat exchanger according to the present invention forms a flat tube material having a flow path inside by molding a plate material clad with a brazing material, and the corrugation is formed in the internal flow path of the tube material. A plurality of tube elements having corrugated inner fins that form a large number of microfluidic channels formed by joining the top portion to the inner surface of the tube material, and many outer fins joined to the outer surface of the tube element alternately. In the heat exchanger configured by laminating and brazing and joining the tube material and the corrugated inner fin constituting the tube element, and the tube element and the outer fin, the corrugated top of the corrugated inner fin A shield that blocks the flow of the molten brazing material that flows along the joining portion of the corrugated top at the end along the length direction. Wherein the parts are provided.

  According to the above heat exchanger, at the time of brazing, the molten brazing material surplus at the other joining portion travels along the joining portion between the corrugated top portion of the corrugated inner fin and the inner surface of the tube material, and the microfluidic flow is caused by the capillary phenomenon. Even if it tries to flow into the channel, it is blocked by the blocking part provided at the end of the corrugated top of the corrugated inner fin in the longitudinal direction, and the excess brazing material tries to flow excessively into the microfluidic channel. Can be prevented. Accordingly, it is possible to prevent occurrence of wax clogging in the microfluidic channel due to excessive flow of the molten brazing material in the microfluidic channel.

  Furthermore, the heat exchanger according to the present invention is the above heat exchanger, wherein at least one end in the length direction of the tube material is provided with a tank portion that allows the adjacent tube materials to communicate with each other and allow fluid to flow in and out. It is characterized by being.

  As described above, in the case where the tank part for allowing the fluid to flow in and out is provided at least at one end in the length direction of the tube material, the tank part generally has a large area ratio of the non-joined part. It is easy to generate brazing material. However, the surplus molten brazing filler metal in this tank section passes through the inner surface of the tube material, travels along the corrugated top of the corrugated inner fin and the inner surface of the tube material, and flows into the microfluidic channel. Since it can be blocked by the blocking portion provided at the end portion along the length direction of the corrugated top portion of the inner fin, it is possible to prevent excessive molten brazing material from flowing excessively into the microfluidic channel. it can.

  Furthermore, in the heat exchanger according to the present invention, in any one of the heat exchangers described above, the blocking portion is configured by at least one of a slit, a hole, a dent, and a notch provided in the corrugated top. It is characterized by that.

  The blocking portion for blocking the flow of the molten brazing filler metal is capable of blocking the flow of the molten brazing filler metal flowing by the capillary phenomenon through the minute gap between the corrugated top of the corrugated inner fin and the inner surface of the tube material. Well, it is possible to block the flow path of the molten brazing filler metal due to capillary phenomenon by providing any one of slit, hole, dent, notch on the corrugated top of the corrugated inner fin and making the corrugated top lack continuity. Therefore, it is possible to prevent the excessive molten brazing material from flowing excessively into the fine fluid flow path.

  Furthermore, the heat exchanger according to the present invention is characterized in that, in any one of the heat exchangers described above, the blocking portions are provided at a plurality of locations along the length direction of the corrugated top.

  As described above, the flow of the molten brazing material can be blocked at the plurality of blocking portions by providing the blocking portions at a plurality of locations along the length direction of the corrugated top. Therefore, it is possible to more reliably prevent the excessive molten brazing material from flowing excessively into the fine fluid flow path.

  Furthermore, the heat exchanger according to the present invention is characterized in that, in any of the heat exchangers described above, the blocking portion is provided on the corrugated top portion on at least one surface side of the corrugated inner fin.

  When excess molten brazing material tends to flow on one surface side of the corrugated inner fin due to the configuration of the tube element and the brazing posture, by providing a blocking portion only on the corrugated top of the corrugated inner fin on the surface side, Excessive flow of the molten brazing material into the microfluidic channel on the surface side can be prevented. In addition, since the blocking strength is provided only on the top of the corrugated inner fin on one side, the bonding strength between the corrugated inner fin and the tube material can be increased on the other side, thereby improving the pressure resistance of the tube element accordingly. Can be made.

  Furthermore, the heat exchanger according to the present invention is characterized in that, in any of the heat exchangers described above, the blocking portion is preferably provided on the corrugated tops on both sides of the corrugated inner fin.

  As described above, the blocking portion is preferably provided at the corrugated tops on both sides of the corrugated inner fin, and excess molten brazing material flows to the corrugated tops formed on any surface side of the corrugated inner fin. However, it is possible to block it and prevent excessive flow of the molten brazing material into the microfluidic channels formed on both sides of the corrugated inner fin.

  In addition, the heat exchanger according to the present invention includes a tank part that abuts two molding materials formed by molding a plate material clad with a brazing material, and allows a fluid to flow in and out, and an internal flow connected to the tank part. A corrugated inner in which a flat tube material is formed by integrally forming paths, and a large number of microfluidic channels are formed in the internal flow path of the tube material by joining the corrugated top to the inner surface of the tube material. A plurality of tube elements including fins and outer fins joined to the outer surface of the tube element are alternately stacked so that the tank portions of the adjacent tube elements communicate with each other so that fluid can flow in and out. The two molding materials, the tube material and the corrugated inner fin, the tank portions of the adjacent tube elements, and the A laminated heat exchanger configured by brazing and joining a tube element and the outer fin to each other, the end of the corrugated inner fin facing the tank portion along the length direction of the corrugated top The portion is provided with a blocking portion for blocking the flow of the molten brazing material that flows along the joint portion between the corrugated top and the inner surface of the tube material.

  As described above, a tube in which two molding materials formed by molding a plate material clad with a brazing material are brought into contact with each other, and a tank portion for allowing fluid to flow in and out, and an internal flow path connected to the tank portion are integrally formed In the case of a laminated heat exchanger using a material, since the tank portion generally has a large area ratio of a non-joined portion to a joined portion, the amount of brazing material is large, and surplus brazing material is easily generated during brazing. The surplus brazing material in this tank part is transferred to the inner surface of the tube material from the tank part to the microfluidic flow path, and the micro gap formed at the junction between the corrugated top of the corrugated inner fin and the inner surface of the tube material is capillary phenomenon. To flow into the microfluidic channel. However, the flow of the excess brazing material due to the capillary phenomenon is blocked by a blocking portion provided at the end of the corrugated inner fin on the side facing the tank portion along the length direction of the corrugated top fin, Can be prevented from flowing into Thereby, it is possible to prevent occurrence of brazing of the microfluidic flow path due to excessive molten brazing material flowing at the joint portion between the corrugated top of the corrugated inner fin and the inner surface of the tube material.

According to the present invention, the blocking portion provided at the end portion of the corrugated inner fin along the length direction of the corrugated top portion causes the capillarity to flow into the microfluidic flow path through the joining portion of the corrugated top portion. Since the molten brazing filler metal can be shut off, it is possible to prevent clogging of the fine fluid passage due to excessive flow of the excess brazing filler material into the fine fluid passage.
Therefore, corrugated inner fins are installed inside the tube element to increase the heat transfer area and make the microfluidic flow path as fine as possible. Can be achieved.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows an external perspective view of a stacked heat exchanger 1 according to the first embodiment of the present invention.
This laminated heat exchanger 1 is frequently used as an evaporator of a vehicle air conditioner, and is provided with a tube element 3 that circulates and evaporates a refrigerant, an outer surface of the tube element 3, and air to be cooled. A plurality of aluminum outer fins 5 formed in a corrugated shape that come into contact with the air and promote heat exchange between the air and the refrigerant are alternately laminated.

As shown in FIG. 2, each tube element 3 has a tube material 7 constituted by butt-joining two molding materials 9A, 9A obtained by press-molding an aluminum plate material clad with a brazing material on both surfaces. . The two molding materials 9A and 9A constituting the tube material 7 have relatively deep recesses 11A constituting the refrigerant inlet tank portion 11 (see FIG. 1) and the refrigerant outlet tank portion 13 (see FIG. 1) on one end side, respectively. , 13A and the openings 11B, 13B formed in the bottom surfaces of the recesses 11A, 13A are pressed, and a U-shaped internal flow path 15 connected to the refrigerant inlet tank portion 11 and the refrigerant outlet tank portion 13 is formed. A relatively shallow dish-shaped recess 15A is pressed.
Further, a plurality of U-shaped beads 15 </ b> B are press-molded in the U-turn portion of the U-shaped internal flow path 15 to uniformly distribute the refrigerant so as to make a smooth U-turn.

  In addition, corrugated inner fins 17 made of aluminum are provided in the straight portion of the internal flow path 15 of the tube material 7. The corrugated inner fin 17 has a corrugated top portion 17A joined to the inner surface of the tube material 7, whereby a plurality of parallel fine refrigerant flow paths (fine fluid flow paths) 19 separated along the tube length direction ( (See also FIG. 4 showing the cross section).

As shown in FIG. 3, the outer fin 5, the tube material 7, and the corrugated inner fin 17 constituting the laminated heat exchanger 1 are each manufactured by molding a sheet material (plate material).
The outer fin 5 is configured by using an aluminum bare sheet material 21 wound in a roll shape as a base material, molding it into a corrugated shape, and cutting it into a predetermined length.
Further, the tube material 7 is made up of two molded materials 9A, which are formed by press-molding an aluminum brazing sheet material 23 wound in a roll shape with a brazing material clad on both sides. 9A is configured by butt-joining.
Furthermore, the corrugated inner fin 17 is configured by using an aluminum bare sheet material 25 wound in a roll shape as a base material, molding it into a corrugated shape, and cutting it into a predetermined length.

  As shown in FIG. 3, the outer fin 5, the tube material 7, and the corrugated inner fin 17 configured as described above are formed into the tube element 3 by incorporating the corrugated inner fin 17 inside the tube material 7. And outer fins 5 are alternately stacked, and through the openings 11B and 13B (see FIG. 2) so that the refrigerant can flow into and out of the refrigerant inlet tank portion 11 and the refrigerant outlet tank portion 13 of the adjacent tube elements 3. Furthermore, the refrigerant inlet header 27 and the refrigerant outlet header 29 (with respect to the refrigerant inlet tank portion 11 and the refrigerant outlet tank portion 13 of the tube elements 3 located on both sides of the laminated tube elements 3 are connected to each other. Temporary assembly using a jig (not shown) in the assembled state That.

  The temporarily assembled laminated heat exchanger 1 is placed in a furnace and heated to a predetermined brazing temperature, whereby the brazing material clad on both surfaces of the tube material 7 is melted. This molten brazing material is a required joint portion, that is, a butt joint portion between the two molding materials 9A and 9A, a joint portion between the inner surface of the tube material 7 and the corrugated top portion 17A of the corrugated inner fin 17, and a refrigerant of the adjacent tube element 3. Joint portion between the inlet tank portion 11 and the refrigerant outlet tank portion 13, joint portion between the outer surface of the tube element 3 and the outer fin 5, the refrigerant inlet tank portion 11, the refrigerant outlet tank portion 13, the refrigerant inlet header 27, and the refrigerant outlet header 29 The component members of the stacked heat exchanger 1 are brazed in the furnace.

  4 shows a tube material 7 made up of two molding materials 9A and 9A constituting the tube element 3, a corrugated inner fin 17 housed inside the tube material 7, and an outer member joined to the outer surface of the tube element 3. FIG. 2 is a partial cutaway view of the laminated heat exchanger 1 showing a brazed joining state of the fins 5, and brazing materials melted from both sides of the molding materials 9 </ b> A and 9 </ b> A are formed at the joining portions between the respective members. The fine gaps flow by capillarity, and the fine gaps are filled with the molten brazing material to be firmly brazed and joined.

  In particular, the corrugated top 17A of the corrugated inner fin 17 housed in the tube material 7 and the inner surface of the tube material 7 are brazed to join the tube material 7 along the length direction of the corrugated inner fin 17. Thus, a large number of parallel fine refrigerant flow paths 19 separated from each other are formed, and the tube element 3 that secures the pressure resistance against the refrigerant is configured.

As shown in FIG. 1, the refrigerant inlet pipe 31 and the refrigerant outlet pipe 33 are connected to the refrigerant inlet header 27 and the refrigerant outlet header 29 of the laminated heat exchanger 1 manufactured as described above, whereby the laminated heat exchanger. 1 is completed.
In the laminated heat exchanger 1 configured as described above, the gas-liquid two-phase refrigerant decompressed by an expansion valve (not shown) or the like passes from the refrigerant inlet pipe 31 through the refrigerant inlet header 27 to each tube element 3. The refrigerant reaches the refrigerant inlet tank section 11 and flows from here to the fine refrigerant flow path 19 in each tube element 3. Heat exchange is performed between the gas-liquid two-phase refrigerant and the air to be cooled flowing between the outer fins 5 on the outer surface of the tube element 3 while circulating in the U-turn portion through the fine refrigerant flow path 19. The two-phase refrigerant is evaporated and gas to be cooled is cooled. The gasified refrigerant reaches the refrigerant outlet tank section 13 and flows out of the refrigerant outlet pipe 33 through the refrigerant outlet header 29.

  Here, the refrigerant is circulated simultaneously from the refrigerant inlet tank portion 11 to the fine refrigerant flow path 19 of each tube element 3, and the refrigerant circulated in the fine refrigerant flow path 19 passes through the refrigerant outlet tank portion 13 to be a refrigerant outlet. Although the example which distribute | circulates to the header 29 was demonstrated, about the distribution | circulation of a refrigerant | coolant, it is not limited to this. For example, the tube element 3 group is divided into a plurality of groups in the width direction of the stacked heat exchanger 1, and the refrigerant is first circulated through the refrigerant refrigerant tank 19 of the first section of the tube element 3 group through the refrigerant inlet tank 11. The refrigerant is circulated through the refrigerant outlet tank portion 13 to the tank portion of the second segment of the tube element 3 group, and further circulated through the fine refrigerant flow path of the second segment of the tube element 3 group to obtain the tube. Various distribution patterns are conceivable, such as allowing the element 3 to circulate a plurality of times. The present invention is not particularly limited with respect to these refrigerant circulation patterns.

In order to achieve high performance, small size, light weight, and compactness of the laminated heat exchanger 1 as described above, it is effective to increase the heat transfer area by incorporating the corrugated inner fins 17 and further miniaturize the fine refrigerant flow path 19. It is known that there is.
However, as the fine refrigerant flow path 19 is further miniaturized, the flow cross-sectional area of the fine refrigerant flow path 19 is reduced by the brazing material when brazing the corrugated top 17A of the corrugated inner fin 17 to the inner surface of the tube material 7. Or the flow path is easily blocked, which hinders performance improvement. This is because the surplus brazing material melted at the other joining portion travels through a minute gap formed at the joining portion between the inner surface of the tube material 7 and the corrugated top portion 17A of the corrugated inner fin 17, and the fine refrigerant flow path 19 is caused by capillary action. It is considered that the factor is excessive flow.

  In the present embodiment, in order to prevent the excessive brazing material from flowing excessively into the fine refrigerant flow path 19, as shown in FIG. 5, the refrigerant inlet along the length direction of the wave-shaped top portion 17 </ b> A of the wave-shaped inner fin 17. A blocking portion 35 for blocking the flow of the molten brazing material to flow along the joint portion between the corrugated top portion 17A and the inner surface of the tube material 7 is provided at the end portion facing the tank portion 11 and the refrigerant outlet tank portion 13. Provided.

  As shown in FIG. 5 (A), the blocking portion 35 is provided with a blocking portion 35 for each of the corrugated top portions 17A formed on both sides of the corrugated inner fin 17, and the corrugated top portions 17A on both surfaces of the corrugated inner fin 17 are provided. The surplus molten brazing filler material that is about to flow through can be blocked, or, as shown in FIGS. 5B and 5C, the configuration of the refrigerant inlet / outlet tank portions 11 and 13 and brazing The blocking portion 35 may be provided only on the corrugated top portion 17A on one surface side (the upper side in the figure) of the corrugated inner fin 17 on the side on which the molten brazing material tends to flow excessively due to the relationship of the posture at the time.

  Further, as shown in FIG. 6, the blocking portion 35 can be configured by providing a slit 35 </ b> A at the wave-shaped top portion 17 </ b> A of the wave-shaped inner fin 17. As shown in FIGS. 7A and 7B, the slits 35A may be provided at two, three, or more locations along the length direction of the waveform top portion 17A. However, in order to ensure the pressure resistance of the tube element 3 by brazing the wave-shaped top portion 17A, it is desirable that the number is as small as possible.

Further, as shown in FIG. 8, the blocking portion 35 can also be configured by making a hole 35B extending in the extending direction of the corrugated top portion 17A in the corrugated top portion 17A of the corrugated inner fin 17. As shown in FIG. 9, the corrugated inner fin 17 can be configured by providing the corrugated top portion 17 </ b> A with a recess 35 </ b> C extending in the extending direction of the corrugated top portion 17 </ b> A. Furthermore, as shown in FIG. 5C, the blocking portion 35 can also be configured by providing a notch 35 </ b> D on the end surface of the corrugated top portion 17 </ b> A of the corrugated inner fin 17.
The slit 35A, the hole 35B, the recess 35C, the notch 35D and the like constituting the blocking portion 35 may be additionally processed on the corrugated top portion 17A after the corrugated inner fin 17 is formed, as shown in FIG. The blocking portion 35 may be first processed at the stage of the sheet material 25 shown in FIG.

With the above configuration, according to the present embodiment, the following operational effects are obtained.
At the time of brazing of the laminated heat exchanger 1, surplus brazing material melted in the refrigerant inlet / outlet tank portions 11, 13, etc. travels along the inner surface of the tube material 7, and the inner surface of the tube material 7 and the corrugated top 17 A of the corrugated inner fin 17. Attempts to flow at the junction by capillary action.
Thus, in the present embodiment, the corrugated top portion 17A and the inner surface of the tube material 7 are disposed at the ends facing the refrigerant inlet tank portion 11 and the refrigerant outlet tank portion 13 along the length direction of the corrugated top portion 17A of the corrugated inner fin 17. A slit 35A, a hole for interrupting the flow of the molten brazing material to flow through the joint portion, ie, cutting off the flow of the molten brazing material due to capillarity or storing the molten brazing material and stopping the flow Since the blocking portion 35 configured by 35B, the recess 35C, the notch 35D, or the like is provided, the flow of the excess brazing material into the fine refrigerant flow path 19 can be blocked by the blocking portion 35.

As a result, the flow path cross-sectional area due to the brazing material of the fine refrigerant flow path 19 is reduced due to the excessive flow of the molten brazing material to the joint portion between the corrugated top 17A of the corrugated inner fin 17 and the inner surface of the tube material 7. In addition, it is possible to reliably prevent the blockage of the flow path due to the clogging of the wax.
For this reason, the fine refrigerant flow path 19 can be further miniaturized, and further improvement in performance, size and weight, and compactness of the stacked heat exchanger 1 can be achieved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The present embodiment is different from the above-described first embodiment only in the configuration of the tube element, and the other points are the same as those of the first embodiment, and thus the description thereof is omitted.
10A and 10B show a state before the assembly of the tube element 103A. FIG. 10A is a perspective view, and FIG. 10B is a right side view thereof.
In the present embodiment, tank portions 111 and 113 for allowing refrigerant to flow in and out are provided at both ends of the tube element 103, respectively.

In the case of such a tube element 103, relatively deep recesses 111A and 113A constituting the refrigerant inflow / outflow tank portions 111 and 113 are press-molded at both ends of the two molding materials 109A and 109A constituting the tube material 107, respectively. Then, two independent and relatively shallow dish-shaped recesses 115A and 115A that constitute the internal flow path 115 between the recesses 111A and 113A at both ends are press-molded.
The corrugated inner fins 17 are respectively provided in the internal flow paths 115 so that the fine refrigerant flow paths 119 are formed. A blocking portion 35 for blocking the flow of the molten brazing material is provided at both ends of the corrugated inner fin 17 facing the refrigerant inflow / outflow tank portions 111 and 113 along the length direction of the wave-shaped top portion 17A.

Also in the present embodiment, as in the first embodiment described above, the fine refrigerant flow path generated by the flow of excess molten brazing material at the joint portion between the corrugated top 17A of the corrugated inner fin 17 and the inner surface of the tube material 107. It is possible to reliably prevent the channel cross-sectional area from being reduced by the brazing material 119 and the blockage of the channel due to the clogging of the brazing.
In the present embodiment, since the tank portions 111 and 113 for allowing the refrigerant to flow in and out are provided at both ends of the tube element 103, the refrigerant circulation pattern in the stacked heat exchanger 1 is variously changed and diversified. be able to.

[Third Embodiment]
Although the above-described first and second embodiments have been described as a so-called stacked heat exchanger suitable as an evaporator, the present invention is also applicable to a parallel flow heat exchanger widely applied as a condenser. it can.
FIG. 11 is a perspective view showing the configuration of the parallel flow heat exchanger 201.
The parallel flow heat exchanger 201 has a large number of tube elements 203 arranged in parallel at a predetermined interval between a pair of header tanks 211 and 213, and a corrugated outer fin 205 is arranged between the tube elements 203. Thus, a large number of tube elements 203 and outer fins 205 are laminated. In the vehicle air conditioner, the header tanks 211 and 213, the tube element 203 and the outer fin 205 are each made of aluminum, and a brazing sheet material clad with a brazing material is used for temporary assembly. It is manufactured by brazing in a furnace in the state.

  In such a parallel flow type heat exchanger (condenser) 201, the high-temperature gas refrigerant flowing into one header tank 211 is circulated in parallel to the plurality of tube elements 203, and the tube elements 203 While circulating inside, heat is exchanged with the external air via the outer fins 205 to be condensed and liquefied. The condensed and liquefied refrigerant is merged in the other header tank 213 and flows out to the outside, or while being circulated several times while meandering in the plurality of tube elements 203 between the pair of header tanks 211 and 213. After being condensed and liquefied, it flows out to the outside.

  The tube element 203 of the parallel flow type heat exchanger 201 also has a fine refrigerant flow path 219 inside. As shown in FIGS. 11 (B) and 11 (C), the fine refrigerant flow path 219 is a tube. A corrugated inner fin 217 is internally provided in the material 207. In this case as well, as in the above-described embodiment of the laminated heat exchanger, clogging of the fine refrigerant flow path 219 due to excessive flow of the molten brazing material into the fine refrigerant flow path 219 during brazing becomes a problem. .

As a solution, a blocking portion 235 for blocking the flow of the molten brazing material is provided at the end facing the header tanks 211 and 213 along the length direction of the corrugated top portion 217A of the corrugated inner fin 217. As a result, it is possible to prevent excessive molten brazing material from flowing excessively into the fine refrigerant flow path 219.
Therefore, also by this embodiment, the same effect as the case of the above-described stacked heat exchanger (evaporator) can be expected.

1 is an external perspective view of a stacked heat exchanger according to a first embodiment of the present invention. It is a disassembled perspective view of the tube element of the laminated heat exchanger. It is a flowchart which shows the manufacturing process of the same laminated heat exchanger. It is a fragmentary broken view which shows the joining state of the structural member of the same laminated heat exchanger. It is a fragmentary sectional view of the same laminated heat exchanger, (A) is a VV section equivalent figure in Drawing 1, and (B) and (C) are side views of a modification of a corrugated inner fin, respectively. It is a perspective view of the corrugated inner fin of the same laminated heat exchanger. It is a figure which shows the modification of the same waveform inner fin, (A) and (B) are the perspective views, respectively. It is a perspective view which shows the other modification of the same waveform inner fin. It is a perspective view which shows the further modification of the same waveform inner fin. It is a figure which shows the tube element of the laminated heat exchanger concerning 2nd Embodiment of this invention, (A) is a disassembled perspective view, (B) is the right view. It is a figure which shows the parallel flow type heat exchanger concerning 3rd Embodiment of this invention, (A) is an external appearance perspective view, (B) is an exploded perspective view of a tube element, (C) is a cross section of a tube element. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminate type heat exchanger 3 Tube element 5 Outer fin 7 Tube material 9A Molding material 11 Refrigerant inlet tank part 13 Refrigerant outlet tank part 15 Internal flow path 17 Waveform inner fin 17A Waveform top part 19 Fine refrigerant flow path 35 Blocking part 35A Slit 35B Hole 35C Recess 35D Notch 103 Tube element 107 Tube material 109A Molding material 111, 113 Refrigerant inflow / outflow tank part 115 Internal flow path 119 Fine refrigerant flow path 201 Parallel flow type heat exchanger 203 Tube element 205 Outer fin 207 Tube material 211, 213 Header tank 217 Corrugated inner fin 217A Corrugated top 219 Fine refrigerant flow path

Claims (7)

A plate material clad with brazing material is molded to form a flat tube material having a flow path therein, and the corrugated top is joined to the inner surface of the tube material in the internal flow path of the tube material. The tube element constituting the tube element is formed by alternately laminating a plurality of tube elements having corrugated inner fins that form a large number of fine fluid flow paths and outer fins joined to the outer surface of the tube element. In the heat exchanger configured by brazing and joining the material and the corrugated inner fin and the tube element and the outer fin,
The heat | fever characterized by providing the interruption | blocking part which interrupts | blocks the flow of the molten brazing material which flows along the junction part of this corrugated top part in the edge part along the length direction of the said corrugated top part of the said corrugated inner fin. Exchanger.   The heat exchanger according to claim 1, wherein a tank portion is provided at least one end in a length direction of the tube material to allow the adjacent tube materials to communicate with each other and allow fluid to flow in and out.   3. The heat exchanger according to claim 1, wherein the blocking portion includes at least one of a slit, a hole, a dent, and a notch provided at the top of the waveform.   The heat exchanger according to any one of claims 1 to 3, wherein the blocking portion is provided at a plurality of locations along a length direction of the corrugated top portion.   5. The heat exchanger according to claim 1, wherein the blocking portion is provided on the corrugated top portion on at least one surface side of the corrugated inner fin.   The heat exchanger according to any one of claims 1 to 4, wherein the blocking portion is preferably provided at the corrugated tops on both sides of the corrugated inner fin. Two flat molding materials formed by molding a plate material clad with a brazing material are butted together, and a tank portion for flowing fluid into and out of the inside and an internal flow passage connected to the tank portion are integrally formed to form a flat tube material And a tube element in which corrugated inner fins that form a large number of microfluidic channels are formed by joining the corrugated top of the tube material to the inner surface of the tube material; and A plurality of outer fins that are joined to the outer surface of the tube element are alternately laminated, and the tank portions of the adjacent tube elements are configured to communicate with each other so that fluid can flow in and out. The tube material and the corrugated inner fin, the tank portions of the adjacent tube elements, and the tube element and the outer A laminated heat exchanger constituted by fin is brazed to each other,
The flow of the molten brazing material flowing along the joining portion between the corrugated top and the inner surface of the tube material is blocked at the end of the corrugated inner fin facing the tank portion along the length direction of the corrugated top. The heat exchanger characterized by the above-mentioned.

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