JP5496279B2 - Heat exchanger and manufacturing method thereof - Google Patents

Description

  The present invention relates to a heat exchanger and a manufacturing method thereof.

  In the past, “a method of producing a heat exchanger by vacuum brazing the divided pieces” has been proposed (see, for example, JP-A-2002-195712).

JP 2002-195712 A

  However, when the heat exchanger is manufactured by joining the split pieces by vacuum brazing, the heat conductivity of the heat exchanger becomes smaller than the heat conductivity of the single split piece.

  The subject of this invention is providing the manufacturing method of the heat exchanger which has a heat conductivity substantially equivalent to the heat conductivity of a division | segmentation piece.

The manufacturing method of the heat exchanger which concerns on 1 aspect of this invention is equipped with an assembly process and a pulse electricity joining process. In the assembly process, extrusion der there are multiple assembly elements of the aluminum alloy A6063 (divided pieces) are assembled such that the fluid passage is formed inside. In the pulse energization joining process, a plurality of assembly members assembled in the assembly process are joined at once by the pulse energization joining method.

In this heat exchanger manufacturing method, a plurality of assembly members assembled in the assembly process are bonded at once by a pulse current bonding method. When the pulse current joining method is used, a plurality of assembly members can be directly joined without using a brazing material. For this reason, if the manufacturing method of this heat exchanger is utilized, the heat exchanger whose heat conductivity between assembly members is substantially the same as the heat conductivity of an assembly member can be manufactured. Therefore, if this heat exchanger manufacturing method is used, a heat exchanger having a thermal conductivity substantially equal to that of the assembly member can be manufactured.

A heat exchanger according to another aspect of the present invention is a heat exchanger having a fluid passage therein, and is formed of a plurality of assembly members made of aluminum alloy A6063 . In this heat exchanger, the thermal conductivity between the assembly members is substantially the same as the thermal conductivity of the assembly members . Here, “substantially the same” means that the absolute value of the difference in thermal conductivity is 5.0 W / (m · K) or less. Moreover, such a heat exchanger is obtained by utilizing the above-mentioned manufacturing method.

In the heat exchanger described above, it is preferable that the plurality of assembly members include an eleventh assembly member, a twelfth assembly member, and a frame-shaped assembly member. The first assembly member has an eleventh plate portion and an eleventh fin. The eleventh fin is formed on the eleventh plate portion. The twelfth assembly member has a twelfth plate portion and a twelfth fin. The twelfth fin is formed on the twelfth plate portion. The eleventh assembly member, the twelfth assembly member, and the frame-shaped assembly member are all preferably extrusion-molded products from the viewpoints of cost reduction and the high degree of freedom of the molded shape. Moreover, as a raw material of this extrusion molded product, A6063 material is especially preferable from a viewpoint of high thermal conductivity. In this heat exchanger, the surface of the eleventh plate portion on which the eleventh fin is formed and one surface of the frame-shaped assembly member are brought into contact with each other to join the eleventh plate portion and the frame-shaped assembly member. The surface of the twelfth plate portion where the twelfth fin is formed and the other surface of the frame-shaped assembly member are abutted to join the twelfth plate portion and the frame-shaped assembly member. In this heat exchanger, the eleventh fin and the twelfth fin may face each other through a gap. In this heat exchanger, there is a gap between the tip of the eleventh fin and the tip of the twelfth fin, and the plurality of twelfth fins may enter between the extended surfaces of the plurality of eleventh fins. Further, in this heat exchanger, a plurality of twelfth fins may enter between the plurality of eleventh fins.

  In this heat exchanger, fins are provided on both the top side and the bottom side. For this reason, this heat exchanger can show favorable heat exchange performance.

It is a figure which shows the assembly method of the heat exchanger which concerns on one Embodiment of this invention. It is a schematic diagram of a pulse electric joining apparatus. It is a figure which shows the assembly method of the heat exchanger which concerns on a modification (D). It is sectional drawing of the heat exchanger which concerns on a modification (D). It is a figure which shows the assembly method of the heat exchanger which concerns on a modification (E). It is sectional drawing of the heat exchanger which concerns on a modification (E). It is a top view of the assembly member concerning a modification (F).

  The manufacturing method of the heat exchanger according to the embodiment of the present invention mainly includes a cleaning process, a drying process, an assembly member confirmation process, a carbon sheet cutting process, a carbon sheet processing process, an assembly process, a heat insulating material forming process, and a lower stage treatment. Tool installation process, workpiece installation process, upper jig installation process, indentation amount adjustment jig installation process, heat insulating material installation process, thermocouple installation process, vacuum drawing process, pulse current joining process, cooling process, extraction process and heat treatment process including.

  In the cleaning process, for example, the first assembly member 101 and the second assembly member 102 shown in FIG. 1 are ultrasonically cleaned while being immersed in an organic solvent or water. Here, the first assembly member 101 is a member made of an aluminum alloy such as A6063, and mainly includes a cover plate portion 101a and a pair of connection ports 101b as shown in FIG. The first assembly member 101 is obtained by drilling an aluminum alloy extruded plate and attaching a connection port 101b to the hole. The second assembly member 102 is a block member made of an aluminum alloy such as A6063. The second assembly member 102 is formed with a plurality of grooves 102a that are folded back at both ends in the longitudinal direction. The second assembly member 102 is obtained by forming a groove 102a in an aluminum alloy extruded block by machining.

  In the drying step, the cleaned first assembly member 101 and second assembly member 102 are dried by a hot air dryer.

  In the assembly member confirmation process, the surface flatness, thickness, standard deviation of thickness, and the like of the first assembly member 101 and the second assembly member 102 are confirmed by an operator.

  In the carbon sheet cutting step, a carbon sheet having a size sufficient to cover the first assembly member 101 and the second assembly member 102 is cut out by an operator.

  In the carbon sheet processing step, a passage for gas generated in the joining process is formed in the carbon sheet.

  In the assembly process, for example, as shown in FIG. 1, the first assembly member 101 and the second assembly member 102 are positioned and assembled, and the carbon sheet is disposed at an appropriate position. In the assembly of the first assembly member 101 and the second assembly member 102, the first assembly member 101 and the second assembly member 102 are arranged such that the side surface position of the first assembly member 101 and the side surface position of the second assembly member 102 coincide with each other. The second assembly member 102 is assembled. As a result, the position of the end portion 102b of the groove 102a of the second assembly member 102 matches the position of the connection port 101b of the first assembly member 101 in plan view. Hereinafter, the assembly of the first assembly member 101 and the second assembly member 102 is referred to as an “assembly”.

  In the heat insulating material forming step, a heat insulating material (not shown) is formed according to the size of the assembly. Here, the heat insulating material is used for the purpose of uniformizing the heat generated by pulse energization over the entire bonding surface. In addition, this heat insulating material plays a role of preventing the heat energy necessary for pulse energization joining from being diffused. For this reason, by using this heat insulating material, it becomes possible to reduce the amount of electric power required to raise the temperature of the assembly to a predetermined temperature.

  In the lower jig installation step, a lower Gr jig (including a spacer, a heat insulating material, etc.) 211 is installed in the pulse energization bonding apparatus 200 shown in FIG. As shown in FIG. 2, the pulse energization bonding apparatus 200 mainly includes a pressurizing device 201, a piston rod 202, energizing electrodes 203 and 204, an installation table 205, a power supply device 206, a vacuum chamber 207, and an energizing member 208. Is done.

  In the workpiece installation process, the assembly with the carbon sheet is disposed on the lower Gr jig 211.

  In the upper jig installation step, an upper Gr jig (including a spacer, a heat insulating material, etc.) 212 is installed on the assembly with the carbon sheet.

  In the step of installing the push-in amount adjusting jig or the like, a push-in amount adjusting jig (not shown) and a side heat insulating material arranging jig (not shown) are installed in the pulse energization bonding apparatus 200.

  In the heat insulating material installation step, a side heat insulating material (not shown) is installed using the side heat insulating material placement jig.

  In the thermocouple installation process, a thermocouple (not shown) is installed in contact with the assembly. In such a case, the thermocouple is installed via an aluminum oxide (Al2O3) protective tube (not shown).

  In the evacuation step, the space including the assembly is covered with the vacuum chamber 207, and the inside of the vacuum chamber 207 is evacuated. Note that the evacuation is usually performed for about 15 to 30 minutes.

  In the pulse energization joining process, the assembly vacuum chamber is heated while the assembly is pressed by the pressurizing device 201, and the assembly is subjected to pulse energization joining processing. Is produced.

  In the cooling step, for example, the assembly is cooled to about 300 ° C. after about 60 minutes from the start of cooling and to about 200 ° C. after 120 minutes.

  In the extraction step, the vacuum chamber 207 is opened to the atmosphere 120 minutes after the start of cooling, and the heat exchanger is extracted from the pulse energization bonding apparatus 200. Note that the temperature of the heat exchanger is about 200 ° C. 120 minutes after the start of cooling.

  The heat exchanger obtained as described above has a fluid passage therein. Further, in this heat exchanger, since the brazing material is not used at the time of manufacture, the first assembly member 101 and the second assembly member 102 are directly joined by pulse energization joining, and therefore, between the first assembly member and the second assembly member. The thermal conductivity of the first assembly member 101 and the second assembly member 102 is substantially the same.

<Characteristics of heat exchanger manufacturing method>
In the heat exchanger manufacturing method according to the embodiment of the present invention, the first assembly member 101 and the second assembly member 102 made of an aluminum alloy are directly joined by pulse energization joining without using a brazing material. For this reason, in the heat exchanger obtained by this manufacturing method, the thermal conductivity between the first assembly member and the second assembly member is substantially the same as the thermal conductivity of the first assembly member 101 and the second assembly member 102. It is. Therefore, if this heat exchanger manufacturing method is used, a heat exchanger having a thermal conductivity substantially equal to the thermal conductivity of the assembly members 101 and 102 can be manufactured.

<Modification>
(A)
Although not particularly mentioned in the previous embodiment, the assembly members 101 and 102 may be manufactured by machining or may be cast.

(B)
Although not particularly mentioned in the previous embodiment, a groove corresponding to the groove of the second assembly member 102 may be formed in the first assembly member 101.

(C)
In the previous embodiment, the assembly members 101 and 102 are made of an aluminum alloy. However, as long as the assembly members 101 and 102 are made of the same material, they may be made of any metal or alloy. However, the metal and alloy need to be suitable for a heat exchanger. Examples of materials other than the aluminum alloy include copper.

(D)
In the previous embodiment, the heat exchanger is manufactured from the two assembly members 101 and 102, but the heat exchanger may be manufactured from the three assembly members 301, 302, and 303 as shown in FIG. Here, reference numeral 301 indicates an eleventh assembly member, reference numeral 302 indicates a thirteenth assembly member, and reference numeral 303 indicates a twelfth assembly member. The eleventh assembly member 301 is an extruded member of an aluminum alloy such as A6063, and is mainly formed of an eleventh plate portion 301a and an eleventh fin 301b as shown in FIG. As shown in FIG. 3, the eleventh fin 301b is a plurality of rectangular plate-like bodies, and extends substantially vertically from the plate surface of the eleventh plate portion 301a. Similar to the eleventh assembly member 301, the twelfth assembly member 303 is an aluminum alloy extruded member such as A6063, and as shown in FIG. Formed from. As shown in FIG. 3, the twelfth fin 303b is a plurality of rectangular plate-like bodies, and extends substantially vertically from the plate surface of the twelfth plate portion 303a. The thirteenth assembling member 302 is a frame-shaped member made of an aluminum alloy such as A6063, and as shown in FIG. Is done. A through-hole is formed in the side surface of the frame portion 302a near the corner portion having a diagonal relationship. The connection port 302b is attached to the through hole of the frame portion 302a. The wing | blade part 302c is extended toward the outer side from the longitudinal direction center part of the frame part 302a, and has a through-hole penetrated in the thickness direction. In addition, in the heat exchanger 310 produced from these assembly members 301, 302, and 303, as shown in FIG. 4, the eleventh fin 301b and the twelfth fin 303b face each other with a gap SP therebetween.

  Also in this example, as long as the assembly members 301, 302, and 303 are made of the same material, they may be made of any metal or alloy. However, the metal and alloy need to be suitable for a heat exchanger. Examples of materials other than the aluminum alloy include copper.

(E)
In the previous embodiment, the heat exchanger is manufactured from the two assembly members 101 and 102, but the heat exchanger may be manufactured from the three assembly members 401, 402, and 403 as shown in FIG. Here, reference numeral 401 indicates a twenty-first assembly member, reference numeral 402 indicates a twenty-third assembly member, and reference numeral 403 indicates a twenty-second assembly member. The twenty-first assembly member 401 is an extruded member of an aluminum alloy such as A6063, and is mainly formed of a twenty-first plate portion 401a and a twenty-first fin 401b as shown in FIG. As shown in FIG. 5, the twenty-first fin 401b is a plurality of rectangular plate-like bodies, and extends substantially vertically from the plate surface of the twenty-first plate portion 401a. Similar to the twenty-first assembly member 401, the twenty-second assembly member 403 is an extruded member of an aluminum alloy such as A6063. As shown in FIG. 5, the twenty-second plate portion 403a and the twenty-second fin 403b Formed from. As shown in FIG. 5, the twenty-second fin 403b is a plurality of rectangular plate-like bodies, and extends substantially perpendicularly from the plate surface of the twenty-second plate portion 403a. The 23rd assembly member 402 is a frame-shaped member made of an aluminum alloy such as A6063 (note that through holes and connection ports are omitted in FIG. 5). In addition, in the heat exchanger 410 produced from these assembly members 401, 402, and 403, as shown in FIG. 6, the 21st fin 401b enters between the 22nd fins 403b.

  A plurality of 22nd fins 403b may enter between the extended surfaces of the plurality of 21st fins 401b. That is, in the heat exchanger 410 shown in FIG. 6, there may be a gap between the tip of the 21st fin 401b and the tip of the 22nd fin 403b.

  Also in this example, as long as the assembly members 401, 402, 403 are made of the same kind of material, they may be made of any metal or alloy. However, the metal and alloy need to be suitable for a heat exchanger. Examples of materials other than the aluminum alloy include copper.

(F)
In the previous embodiment, the heat exchanger was manufactured from the two assembly members 101 and 102. However, the assembly member 500 shown in FIG. 7 and a lid with a connection port (the first assembly member according to the previous embodiment). A heat exchanger may be made from a reference (not shown) and a bottom plate (not shown). The assembly member 500 is formed with a through groove 501 that is bent back and forth at both ends in the vertical direction. And only one assembly member 500 may be used, or a plurality of assembly members 500 may be used. That is, when the assembly member 500 is used, the height of the fluid passage of the heat exchanger can be adjusted.

(G)
In the previous embodiment, the flat plate type heat exchanger is manufactured from the two assembly members 101 and 102, but a cylindrical heat exchanger may be manufactured from the three assembly members. Specifically, such a cylindrical heat exchanger is configured such that “a cylindrical wall member in which a plurality of through holes penetrating the side wall in the axial direction is formed” and “two adjacent through holes of the cylindrical wall member are alternately arranged. The lid member is formed with a first communication groove to be communicated, and the “bottom member is formed with a second communication path in which two adjacent through holes that are not communicated with each other through the first communication groove are alternately communicated”.

101 First assembly member (assembly member)
102 Second assembly member (assembly member)
102a Groove (fluid passage)
301 11th assembly member 301a 11th plate part 301b 11th fin 302 13th assembly member (frame-shaped assembly member)
303 12th assembly member 303a 12th plate part 303b 12th fin 401 21st assembly member (11th assembly member)
401a 21st plate portion (11th plate portion)
401b 21st fin (11th fin)
402 23rd assembly member (frame-shaped assembly member)
403 22nd assembly member (12th assembly member)
403a 22nd plate (12th plate)
403b 22nd fin (12th fin)
500 Assembly parts

Claims (4)

A plurality of assembly members Ru extrusion der aluminum alloy A6063, the assembly process for assembling such fluid passages are formed therein,
A method of manufacturing a heat exchanger, comprising: a pulse energization joining step in which the plurality of assembly members assembled in the assembly step are subjected to pulse energization joining at a time by a pulse energization joining method. A heat exchanger having a fluid passage therein,
Formed from a plurality of assembly members made of aluminum alloy A6063 ;
Heat exchanger thermal conductivity between the assembly member is a thermal conductivity substantially identical to the assembly member. The plurality of assembly members include (a) an eleventh assembly member having an eleventh plate portion and eleventh fins formed on the eleventh plate portion, and (b) a twelfth plate portion and the twelfth plate. A twelfth assembly member having a twelfth fin formed on the portion, and (c) a frame-shaped assembly member,
The surface of the eleventh plate portion where the eleventh fin is formed and one surface of the frame-shaped assembly member are abutted to join the eleventh plate portion and the frame-shaped assembly member;
The surface of the twelfth plate portion where the twelfth fin is formed and the other surface of the frame-shaped assembly member are abutted to join the twelfth plate portion and the frame-shaped assembly member.
The heat exchanger according to claim 2. The twelfth fin enters between the eleventh fins,
  There is a gap between the tip of the eleventh fin and the twelfth plate part,
  There is also a gap between the tip of the twelfth fin and the eleventh plate portion.
The heat exchanger according to claim 3.

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