WO2011071041A1 - Four à reflux - Google Patents

Four à reflux Download PDF

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Publication number
WO2011071041A1
WO2011071041A1 PCT/JP2010/071903 JP2010071903W WO2011071041A1 WO 2011071041 A1 WO2011071041 A1 WO 2011071041A1 JP 2010071903 W JP2010071903 W JP 2010071903W WO 2011071041 A1 WO2011071041 A1 WO 2011071041A1
Authority
WO
WIPO (PCT)
Prior art keywords
flux
drain
reflow furnace
fan
reflow
Prior art date
Application number
PCT/JP2010/071903
Other languages
English (en)
Japanese (ja)
Inventor
杉原崇史
田口寛
笠原大介
細川晃一郎
斉藤雄太
Original Assignee
千住金属工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2009282261A external-priority patent/JP5540680B2/ja
Priority claimed from JP2010101326A external-priority patent/JP5565071B2/ja
Application filed by 千住金属工業株式会社 filed Critical 千住金属工業株式会社
Priority to US13/514,969 priority Critical patent/US9243845B2/en
Priority to CN201080056269.1A priority patent/CN102652044B/zh
Priority to PL10835961T priority patent/PL2511036T3/pl
Priority to KR1020127014907A priority patent/KR101396657B1/ko
Priority to EP10835961.3A priority patent/EP2511036B1/fr
Publication of WO2011071041A1 publication Critical patent/WO2011071041A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/008—Soldering within a furnace
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/012—Soldering with the use of hot gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/012—Soldering with the use of hot gas
    • B23K1/015—Vapour-condensation soldering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
    • B23K3/08—Auxiliary devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/04—Circulating atmospheres by mechanical means

Definitions

  • the present invention prevents a part of the vaporized flux generated by the reflow process from adhering to a motor rotating shaft for rotating a fan disposed in the preheating zone, the main heating zone, and the cooling zone and solidifying.
  • the present invention relates to a reflow furnace equipped with a flux recovery device for the purpose.
  • the present invention also relates to a reflow furnace for soldering an electronic component onto a substrate by performing a reflow process on the substrate on which the electronic component is mounted on a solder containing flux. Specifically, in order to prevent a part of the vaporized flux generated by the reflow process from adhering to the motor rotating shaft for rotating the fan disposed in the preheating zone, the main heating zone, and the cooling zone and solidifying.
  • the present invention relates to a reflow furnace equipped with a flux recovery apparatus.
  • a reflow furnace is generally used when soldering a printed circuit board and electronic components.
  • the reflow furnace includes a transport conveyor for transporting the substrate and a tunnel-shaped reflow main body (muffle) to which the substrate is supplied by the transport conveyor.
  • a preheating zone, a main heating zone, and a cooling zone are provided along a conveyance path from the carry-in port to the carry-out port.
  • a set of hot air blowing heaters and fans are installed in each of the preheating zone and the main heating zone.
  • the hot air blowing heater and the fan are installed above and below the conveyor.
  • a fan for blowing cooling air to cool the printed circuit board heated in the preheating zone and the main heating zone, and a motor for rotating the fan are installed.
  • the board on which the solder paste is printed in advance is transported into the reflow furnace.
  • the solder paste printed on the board contains powder solder, solvent, and flux.
  • the flux contains rosin as a component, removes the oxide film on the surface of the metal to be soldered, prevents reoxidation by heating during soldering, and reduces the surface tension of the solder. Has the effect of improving wettability.
  • the substrate contained in the reflow furnace is volatilized by the solvent contained in the paste solder in the preheating zone. Subsequently, in the heating zone, hot air is blown from above and below to the substrate conveyed by the conveyor, and the paste solder is melted. In the cooling zone, the heated printed circuit board is cooled, and the molten solder is solidified. Through such a series of steps, the electronic component is soldered to the joint on the printed circuit board.
  • the flux is vaporized and filled in the reflow body by heating with the heater.
  • the vaporized flux filled in the reflow body is generally cleaned through a removing device for removing a flux component provided outside the muffle, and then returned to the muffle through the circulation path.
  • a removing device for removing a flux component provided outside the muffle
  • the fans arranged in the preheating zone, the main heating zone, and the cooling zone rotate, there is a flow that goes around to the back side of the fan. Therefore, a part of the flux evaporated by this flow goes to the back side of the fan. It may be crowded.
  • the vaporized flux that circulates to the back side of the fan is cooled and becomes a fluid flux.
  • the reflow furnace disclosed in Patent Document 1 has the following problems. (1) The flux that has liquefied around the back side of the fan flows against the direction of the inclination of the inclined surface due to the wind toward the center of the fan generated during the rotation of the fan, and flows to the rotation axis (center) of the fan. There was a tendency to gather. At this time, if the flux enters the seal portion of the rotating shaft, the flux is fixed due to a decrease in temperature due to the stop of the fan, and when the next fan is operated, the motor shaft is solidified by the fixation of the flux and the motor is overloaded. There was a problem that the motor did not rotate normally. In this case, since the reflow furnace cannot be moved, there arises a problem that an operation for removing the flux fixed to the motor is required.
  • the present invention solves the above-mentioned problems, and its purpose is to attach vaporized flux to a motor rotating shaft for rotating a fan disposed in a preheating zone, a main heating zone, and a cooling zone.
  • a reflow furnace equipped with a flux recovery device capable of recovering efficiently and reliably in a liquefied state having fluidity before the vaporized flux is solidified in order to prevent solidification It is in.
  • Another object of the present invention is to provide a reflow furnace capable of suppressing the retention of flux on a base member or piping.
  • a reflow furnace includes a reflow main body having a motor, a fan connected to the motor via a rotating shaft, and a case member that houses the fan, and a reflow of the reflow main body.
  • the flux includes a vaporized state flux, a fluid liquid flux, and a solidified flux.
  • the reflow furnace according to the present invention includes a flux recovery device for recovering the flux generated by the reflow process of the reflow furnace main body having a drive unit and a fan connected to the drive unit via a rotating shaft.
  • a reflow furnace, a flux recovery device is provided on the opposite side of the base member attached to the main body of the reflow furnace and the fan of the base member and on the periphery of the rotating shaft, and flows in the flux generated by the reflow process.
  • a drain part for discharging to the outside, a flux recovery part for recovering the flux through the drain part, and a pressure reducing part for reducing the pressure in the flux recovery part.
  • the reflow furnace includes a flux recovery device for recovering the flux generated by the reflow process of the reflow furnace main body having a drive unit and a fan connected to the drive unit via a rotating shaft.
  • the flux recovery apparatus includes a base member attached to the main body of the reflow furnace, a drain part provided on the base member, for allowing the flux accumulated on the base member to flow in and discharging to the outside, and one end A drain pipe connected to the drain part via a drain pipe, the other end extending in a vertical direction from the drain pipe, and a flux that is detachably attached to the other end of the drain pipe and collects the flux that flows through the drain pipe And a recovery unit.
  • the reflow furnace includes a flux recovery device for recovering the flux generated by the reflow processing of the reflow furnace main body having a drive unit and a fan connected to the drive unit via a rotating shaft.
  • the flux recovery apparatus includes a base member attached to the main body of the reflow furnace, a drain part provided on the base member, for allowing the flux accumulated on the base member to flow in and discharging to the outside, and one end There is a drain pipe connected to the drain part via the drain pipe, the other end extending from the drain pipe, and a flux collecting part that is detachably attached to the other end of the drain pipe and collects the flux flowing through the drain pipe.
  • the outer diameter of the end of the drain pipe on the discharge pipe side is selected to be equal to or smaller than the inner diameter of the discharge pipe engaged with this end, and the end of the drain pipe is located inside the discharge pipe. Those attached to insert.
  • the drain portion is provided in the peripheral portion of the rotating shaft, the flux that inevitably collects on the rotating shaft can be efficiently and surely flowed into the drain portion, It is possible to prevent the flux from sticking to the shaft. As a result, it is possible to reduce the work time for removing the drive unit, the fan, and the base member due to flux fixation, the cleaning work, and the like, so that the production efficiency can be greatly improved.
  • the flux accumulated on the base member, the drain unit or the like can be forcibly sucked into the flux collection unit.
  • the discharge pipe provided between the drain part and the flux recovery part extends in the vertical direction, the flux that has flowed into the discharge pipe can be dropped to the flux recovery part by its own weight. it can.
  • the flux can be effectively and easily accommodated in the flux collection unit without being accumulated in the middle of the discharge pipe.
  • FIG. 1 It is a figure which shows the structural example of the reflow furnace which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the structural example of a flux collection
  • the reflow furnace 100 includes a reflow furnace body (muffle) 40, a transfer conveyor 80, a heater 72, a fan 74, a motor 12, and a flux recovery device 10 ⁇ / b> A.
  • the reflow furnace main body 40 is a casing extending in the shape of a tunnel having a carry-in port 40a and a carry-out port 40b. And a cooling zone Z3.
  • the transport conveyor 80 extends along a transport path from the transport inlet 40a to the transport outlet 40b, and transports the printed circuit board 70 from the transport inlet 40a of the reflow furnace body 40 toward the transport outlet 40b at a predetermined speed. (Arrow X direction (conveyance path)).
  • the heater 72, the fan 74, and the motor 12 are installed in each of the preheating zone Z ⁇ b> 1 and the main heating zone Z ⁇ b> 2, and are arranged to face each other in the vertical direction of the transport conveyor 80.
  • the preheating zone Z1 has a unit composed of a pair of upper and lower heaters 72, a fan 74 and a motor 12, and similarly, the main heating zone Z2 has a pair of upper and lower heaters 72 and a fan.
  • a unit composed of 74 and the motor 12 has a two-unit configuration.
  • a heater 72 and a fan 74 constituting one unit of the preheating zone Z1 and the main heating zone Z2 are accommodated in a box-shaped case member 40A.
  • the heater 72 installed in the preheating zone Z1 and the main heating zone Z2 heats the gas inside the reflow furnace body 40 to generate hot hot air.
  • the fan 74 is formed of, for example, a sirocco fan, and is rotated by the drive of the motor 12 and blows hot air heated by the heater 72 from above and below the printed circuit board 70. As a result, the solder of the printed circuit board 70 is melted, and electronic components and the like are fixed to the electrodes of the printed circuit board 70.
  • the heater 72, fan 74, and motor 12 installed in the preheating zone Z1 and the main heating zone Z2 have the same configuration.
  • the configuration of the cooling zone Z3 is a configuration in which the heater 72 is removed from the unit configurations of the preheating zone Z1 and the main heating zone Z2, and the refrigerator and the motor constitute the refrigerator 92.
  • the flux recovery apparatus 10A is an apparatus for efficiently recovering the vaporized flux generated by the reflow processing to the printed circuit board 70 by the heater 72 and the fan 74 in a fluid liquid flux state. , Provided for each fan 74 and motor 12.
  • the flux recovery apparatus 10A may be configured differently for each of the preheating zone Z1, the main heating zone Z2, and the cooling zone Z3 according to the components of the flux generated in each preheating zone Z1 and the main heating zone Z2. However, it can be configured differently for each unit constituting each zone. The flux recovery apparatus 10A will be described later.
  • FIG. 1 a printed circuit board 70 on which surface-mounting electronic components are mounted is placed on a transport conveyor 80 and is carried into the reflow furnace 100 through a carry-in entrance 40 a.
  • a preheating zone Z ⁇ b> 1 in the reflow furnace 100 hot air is blown onto the printed circuit board 70 by driving the heaters 72, the fans 74, and the motor 12 installed above and below the transport conveyor 80. Thereby, the flux is activated and the oxide film on the surface of the electrode and the solder paste is removed.
  • the vaporized flux generated by the reflow process is filled in the reflow furnace main body 40 and is generally purified by a removal device that removes a flux component provided outside the furnace, although not shown. It is returned to the furnace again via the road.
  • a removal device that removes a flux component provided outside the furnace, although not shown. It is returned to the furnace again via the road.
  • a flow that flows around to the back side of the fan 74 is generated, so a part of the flux vaporized by this flow is Go around the back side of the fan 74.
  • the flux recovery device 10A is installed for each motor 12 and fan 74, a part of the vaporized flux that has circulated to the back side of the fan 74 installed in the preheating zone Z1 is a flux recovery device. Recovered by 10A.
  • the solder is melted and the electronic components are fixed to the electrodes of the printed circuit board 70.
  • the flux generated at this time is also collected by the flux collecting apparatus 10A as described above.
  • the printed circuit board 70 is transported to the cooling zone Z3, the printed circuit board 70 is rapidly cooled to form a solder composition.
  • the printed circuit board 70 cooled in the cooling zone Z3 is carried out from the carry-out port 40b.
  • the vaporized flux generated by blowing hot air is also collected by the flux collecting apparatus 10A provided for each refrigerator 92 in the cooling zone Z3 as described above.
  • a flux collecting apparatus 10A according to the present invention includes a motor base 16, a high neck collar portion 18, a drain portion 20, a drain pipe 38, and a collecting container 34, which are examples of a base member, as shown in FIGS. ing. Since the flux of liquid deposited on the motor base 16 flows downward due to its own weight, the flux recovery apparatus 10 according to the present invention is basically only on the lower side of the conveyor 80 of the reflow furnace 100 shown in FIG. It shall be installed.
  • the motor base 16 is a disk-shaped member made of a metal material excellent in corrosion resistance and heat resistance, such as stainless steel (SUS) and aluminum, and having a slightly larger outer diameter than the fan 74, and accommodates the fan 74 and the like.
  • the case member 40A (see FIG. 1) is attached to the bottom surface portion via a fastening member such as a screw.
  • the motor base 16 is inclined on the side facing the fan 74 such that the wall portion 16b formed along the periphery of the motor base 16 and the height of the flat portion from the wall portion 16b toward the rotary shaft 14 decrease. And the inclined surface 16a. Since the drain part 20 is formed in the peripheral part of the rotating shaft 14 as will be described later, the flux accumulated on the motor base 16 is effectively caused to flow to the drain part 20 formed on the motor base 16 by the inclined surface 16a. Can do.
  • the motor 12 is attached to the back side of the motor base 16 (the side opposite to the fan 74) via the central drain block 22.
  • the motor 12 is connected to a commercial power supply unit 200, for example, and rotates the fan 74 via the rotary shaft 14 based on an instruction from a control device (not shown).
  • One end of the rotary shaft 14 is rotatably attached to the motor 12, and a portion extending from the motor base 16 at the other end toward the fan 74 is attached to the fan 74.
  • a sealing member 32 is inserted for prevention.
  • a contact-type seal member such as an oil seal, V-packing, or Teflon (registered trademark) seal
  • a non-contact-type seal member for example, a labyrinth seal
  • an example using a V packing and a Teflon (registered trademark) seal is shown.
  • FIG. 7A when a non-contact type seal (labyrinth seal) is used as the sealing member 32A and nitrogen gas is injected (N 2 purge), since it is a non-contact type, no grease is required, resulting in cost reduction. This has the effect that it can be achieved.
  • FIG. 7B when the contact type V packing is used as the sealing member 32B and grease is enclosed, and as shown in FIG. 7C, the contact type oil seal is used as the sealing member 32C.
  • the flux can be effectively prevented from flowing into the gap S1 of the rotary shaft 14.
  • FIG. 7D when a contact type Teflon (registered trademark) seal is used as the seal member 32D and nitrogen gas is injected (N 2 purge), it is possible to effectively prevent the flux from flowing and no grease is required. The effect of becoming can be obtained.
  • Teflon registered trademark
  • the high neck collar portion 18 is provided above the seal member 32 and along the circumferential direction of the rotary shaft 14, and the flux to the gap S ⁇ b> 1 between the rotary shaft 14 and the central drain block 22. It prevents the intrusion of etc.
  • the high neck collar portion 18 is configured by integrally forming a base portion 18a, a cylindrical portion 18b, and a folded portion 18c.
  • the base portion 18a is formed of an annular body having an inner diameter substantially the same as the inner diameter of the rotary shaft 14, and is attached to the upper surface portion of the motor base 16 via a fastening member such as a screw.
  • the cylindrical portion 18 b is erected upward from the inner peripheral edge portion of the base portion 18 a and is formed along the circumferential direction of the rotating shaft 14.
  • the folded portion 18c is folded outward from the upper end edge of the cylindrical portion 18b and extends outward by a predetermined length. With such a configuration, it is possible to reliably prevent mainly the flux fume from entering the gap S1 of the rotating shaft 14.
  • the drain part 20 is configured by a groove (valley part) for discharging flux and the like accumulated on the motor base 16 from the motor base 16 to the outside, and is formed in the peripheral part of the rotary shaft 14 located at the center of the motor base 16. ing. That is, in this example, the drain portion 20 is a central portion of the motor base 16 and is formed in an annular shape when viewed in plan so as to be along the circumferential direction of the rotating shaft 14. The reason why the drain portion 20 is formed in the central portion of the motor base 16 is that the flux gathers at the central portion (rotating shaft 14) of the motor base 16 due to the wind toward the center generated when the fan 74 rotates. is there. As shown in FIGS.
  • the drain portion 20 is an inclined surface that is inclined from the planar position of the motor base 16 toward the drain pipe 38 (discharge port 46) provided on the back side of the motor base 16.
  • 20A The upstream side C of the inclined surface 20A has a mountain shape that is curved so that the center portion thereof is high and becomes lower toward the wall surface portions 20B on both sides (see FIG. 8).
  • a discharge port 46 for discharging the flux flowing into the drain portion 20 to the outside is formed in the wall surface portion 20 ⁇ / b> B located on the downstream side of the inclined surface 20 ⁇ / b> A of the drain portion 20.
  • a drain pipe 38 extending obliquely outward and downward is connected to the discharge port 46.
  • the drain pipe 38 constitutes an example of a first discharge pipe.
  • a pipe pipe 48 is connected to the drain pipe 38.
  • the pipe tube 48 has an outer diameter selected to be substantially the same as the inner diameter of the drain tube 38, and is configured to be inserted / removed inside the drain tube 38.
  • the discharge part of the drain part 20 has a double structure of the drain pipe 38 and the pipe pipe 48.
  • the pipe pipe 48 constitutes an example of a second discharge pipe.
  • the length in the longitudinal direction of the pipe tube 48 is selected to be greater than the length in the longitudinal direction of the drain tube 38 (see FIG. 12), and when the pipe tube 48 is inserted inside the drain tube 38, the tip of the pipe tube 48 is It extends to the vicinity of the discharge port 46.
  • a thread groove 48 a is formed on the outer peripheral portion of the pipe tube 48, and the drain tube 38 is screwed into the thread groove (not shown) formed inside the drain tube 38. It can be attached to.
  • the container lid 42 includes a top surface part 42a having substantially the same diameter as the outer diameter of the collection container 34, and a side wall part 42b erected on the outer peripheral edge of the top surface part 42a.
  • a thread groove 42c corresponding to the thread groove 34b of the collection container 34 is formed on the inner peripheral surface of the side wall portion 42b.
  • the recovery container 34 is connected to the drain pipe 38 via the pipe pipe 48 and accommodates the flux that has flowed through the drain portion 20, the discharge port 46, the drain pipe 38 and the pipe pipe 48.
  • a thread groove 34 b is formed on the peripheral edge of the upper end of the collection container 34.
  • the collection container 34 is selected to have a size that can be easily removed by an operator and can accommodate a certain amount of flux. Further, the collection container 34 may be made of a transparent material so that the amount of flux collected in the collection container 34 can be easily confirmed.
  • a nitrogen space portion S ⁇ b> 2 for injecting nitrogen gas into the gap S ⁇ b> 1 between the outer peripheral surface 32 a of the seal member 32 and the inner peripheral surface 22 a of the central drain block 22 is inserted into the central drain block 22.
  • the nitrogen space S2 is a space for injecting nitrogen gas into the gap S1 to set the pressure P2 inside the gap S1 to be higher than the pressure P1 on the reflow furnace main body 40 side, and the inner inlet is in the gap S1.
  • the outer injection port communicates with the outside.
  • a half union 30 is attached to the inlet of the nitrogen space S, and a nitrogen generation unit 300 for generating nitrogen gas is connected to the half union 30.
  • the central drain block 22 is provided with a grease injection portion (not shown) for injecting the grease of the seal member 32 separately from the nitrogen space portion S2.
  • the reflow furnace 100 when the reflow furnace 100 is turned on, nitrogen gas is introduced into the reflow furnace main body 40 from a nitrogen inlet (not shown), and the pressure P1 in the furnace is set to 500 Pa.
  • nitrogen gas is injected into the nitrogen space S2 from the nitrogen generator 300 through the half union 30, and the pressure P2 in the gap S1 is adjusted to 0.3 MPa or less, for example.
  • the pressure P2 in the gap S1 between the outer peripheral surface 32a of the seal member 32 and the inner peripheral surface 22a of the central drain block 22 becomes higher than the pressure P1 in the reflow furnace body 40, and the nitrogen flows from the gap S1 to the reflow furnace body 40. Therefore, it is possible to reliably prevent the flux from entering the gap between the rotating shaft 14 and the seal member 32 by preventing the flux from entering the gap S1. As a result, sticking of the rotating shaft 14 due to the flux can be avoided.
  • the flux F that has flowed into the drain unit 20 is accommodated in the collection container 34 via the drain port 46, the drain pipe 38, and the pipe pipe 48 of the drain unit 20.
  • FIG. 11 shows.
  • the flux F that is the contents of the collection container 34 is collected.
  • the collection container 34 is attached to the container lid 42 and set again.
  • the rotating shaft 14 is inevitably required when the fan 74 rotates.
  • the liquefied flux F having the fluidity before the vaporized flux F gathering at the solidified state can be efficiently and reliably introduced into the drain portion 20 and discharged to the outside.
  • permeation of the flux F into the rotating shaft 14 can be avoided, and the fixation of the flux F on the rotating shaft 14 can be prevented.
  • the drain portion 20 is provided at one location of the motor base 16 and the drain pipe 38 connected to the drain portion 20 is drawn obliquely outward and downward. Therefore, by pulling out the drain pipe 38 on one side surface of the reflow furnace 100 that can be opened and closed, the removal operation and the cleaning operation of the collection container 34 can be easily and efficiently performed. Thereby, an operator's work burden can be reduced significantly.
  • the drain structure is a double structure of the drain pipe 38 and the pipe pipe 48, the inner pipe pipe 48 is removed from the drain pipe 38 even when the flux F stagnates (clogs) in the discharge path.
  • the inside of the pipe tube 48 can be easily cleaned outside the reflow furnace 100.
  • the flux F does not remain in the drain pipe 38, clogging of the flux F can be reliably prevented.
  • the high neck collar portion 18 having a folded structure along the circumferential direction of the rotating shaft 14, it is possible to effectively cause the flux F or flux fume to enter the gap S ⁇ b> 1 between the seal member 32 and the rotating shaft 14. Can be prevented.
  • the pressure in the gap S1 between the rotating shaft 14 and the central drain block 22 is set to be higher than the pressure in the reflow furnace body 40, so that flux F and flux fume enter the gap S1. This can be surely prevented.
  • the flux recovery apparatus 10B according to the second embodiment is different from the flux recovery apparatus 10A described in the first embodiment in that it includes a heater for heating the flux.
  • recovery apparatus 10B is the same as the flux collection
  • a heater mounting portion 39 for mounting a flux heating heater 90 is provided on the drain 46 side of the drain pipe 38 constituting the flux collecting apparatus 10 ⁇ / b> B.
  • the heater mounting portion 39 is a portion whose diameter is larger than the outer diameter of the drain pipe 38, and is a heater insertion hole 39a for inserting the flux heating heater 90 into each of the lower corners of the rectangular outer surface. , 39a are formed.
  • the flux heating heater 90 is a rod-shaped so-called card ridge heater, is mounted in the heater insertion hole 39a, and heats the drain pipe 38 and the pipe pipe 48 from the lower side of the drain pipe 38.
  • two flux heating heaters 90 are used, but one flux heating heater 90 may be used, or three or more flux heating heaters 90 may be used.
  • the mounting position of the flux heating heater 90 is not limited to the lower corner portion of the heater mounting portion 39, and may be the upper portion of the heater mounting portion 39 or may be on the left and right.
  • a wiring is connected to the outer end of the flux heating heater 90, and the power supply unit 200 is connected to the other end of the wiring.
  • the power source unit 200 for example, a commercial power source of 200V is used.
  • a control unit heats the drain pipe 38 and the pipe pipe 48 by turning on the flux heating heater 90 simultaneously with turning on the power of the reflow furnace 100, for example.
  • the temperature control by the flux heating heater 90 may be intermittent control that stops after heating for a certain period of time, or the temperature of the drain pipe 38 or the like is measured by a temperature sensor, and the flux is determined based on the measured temperature result.
  • the heater 90 may be turned on / off. Further, the temperature of the flux heating heater 90 may be varied depending on the type of flux to be used. Furthermore, since the components of the generated flux are different between the preheating zone Z1 and the main heating zone Z2, the temperature may be controlled to be different in each zone.
  • the flux heating heater 90 is installed in the drain pipe 38 where the temperature drop is significant after the heater 72 and the fan 74 are stopped, the drain section 20 and the drain pipe A temperature drop near 38 can be reliably prevented. Thereby, the stagnation (clogging) due to the decrease in the clay of the flux can be effectively prevented, and the flux can be smoothly and reliably flowed and accommodated in the collection container 34. As a result, it is possible to reduce the work time for removing and cleaning each component such as the motor 12 due to the fixation of the flux, and the production efficiency can be greatly improved.
  • the flux recovery apparatus 10C according to the third embodiment differs from the first embodiment in which the drain portion 20 is provided at the central portion of the motor base in that the drain portion 20 is provided at the peripheral portion of the motor base. Yes.
  • recovery apparatuses 10C is the same as the flux collection
  • the drain portion 20 constituting the flux recovery apparatus 10 ⁇ / b> C penetrates the motor base 16 obliquely outward and downward from the peripheral edge of the upper surface of the motor base 16 (the surface facing the fan 74). Is formed.
  • the drain part 20 is provided in two places, and these drain parts 20 and 20 are arrange
  • the upper surface of the motor base 16 is an inclined surface 16 c that is inclined from the central portion of the motor base 16 toward the drain portion 20 in the outward direction. As a result, the liquefied flux flows outward along the inclined surface 16c, flows into the drain portion 20, and is discharged to the recovery container 34 described later.
  • a pipe pipe 48 is connected to the drain portion 20.
  • the outer diameter of the pipe tube 48 is selected to be substantially the same as the inner diameter of the drain portion 20, and the pipe tube 48 is configured to be inserted / removed inside the drain portion 20.
  • the length in the longitudinal direction of the pipe tube 48 is selected to be longer than the length in the longitudinal direction of the drain portion 20, and when the pipe tube 48 is inserted inside the drain portion 20, the distal end portion of the pipe tube 48 is the drain portion 20. It extends to a position near the inflow port 20C.
  • a thread groove is formed on the outer periphery of the tip of the pipe tube 48, and the pipe tube 48 can be screwed into a thread groove formed on the inner side of the drain portion 20 to be fixed and attached to the drain portion 20. Yes.
  • the other end of the pipe 48 is provided with a container lid 42 that functions as a lid for a collection container 34 to be described later.
  • a thread groove corresponding to the thread groove of the collection container 34 is formed on the inner peripheral surface of the container lid 42.
  • the collection container 34 is connected to the drain part 20 through the pipe pipe 48 and accommodates the flux that has flowed through the drain part 20 and the pipe pipe 48.
  • a thread groove is formed on the periphery of the upper end of the collection container 34, and the collection container 34 is detachably attached to the pipe pipe 48 by fitting the collection container 34 into the thread groove formed in the container lid 42. It is possible.
  • the collection container 34 is selected to have a size that can be easily removed by an operator and can accommodate a certain amount of flux. Further, the collection container 34 may be made of a transparent material so that the amount of flux collected in the collection container 34 can be easily confirmed.
  • the same operational effects as those of the first embodiment can be obtained. That is, since the drain structure is a double structure of the drain part 20 and the pipe pipe 48, even if the flux is stagnated (clogged) in the middle of the discharge path, the inner pipe pipe 48 is removed from the drain part 20. The inside of the pipe tube 48 can be easily cleaned outside the reflow furnace 100. In addition, since flux does not remain in the drain portion 20, it is possible to reliably prevent clogging of the flux and the like.
  • FIG. 18 shows an example of the configuration of a reflow furnace 100A according to the present invention.
  • the reflow furnace 100 ⁇ / b> A according to the present invention includes a reflow furnace main body 40 and a transfer conveyor 80.
  • the reflow furnace body 40 includes a tunnel-shaped housing having a carry-in port 40a and a carry-out port 40b.
  • the transfer conveyor 80 extends along the transfer path X from the carry-in port 40a to the carry-out port 40b, and the printed circuit board 70 is moved at a predetermined speed from the carry-in port 40a to the carry-out port 40b. Carry in.
  • the preheating zone Z1 is an area for volatilizing a solvent contained in the solder paste, and a heater 72, a fan 74, a motor 12, and the like are installed.
  • solder paste for example, lead-free solder containing tin-silver-copper, tin-zinc-bismuth or the like is used.
  • the melting point of this molten solder is, for example, about 180 ° C. to 220 ° C.
  • the main heating zone Z2 is an area for melting the solder by heating the printed circuit board 70, and the heater 72, the fan 74, the motor 12, and the like are installed. Note that, in the preheating zone Z1 and the main heating zone Z2, the configurations of the heater 72, the fan 74, and the motor 12 are generally different using only the temperature setting using the same configuration, but are different. It is good also as a structure. Even when different configurations are adopted, the basic configuration and functions are the same, and thus the description thereof is omitted for the sake of convenience.
  • the heater 72 is disposed so as to face the upper and lower sides of the transport conveyor 80, and heats the air inside the preheating zone Z1 and the main heating zone Z2.
  • three heaters 72 are arranged in the upper and lower parts in the preheating zone Z1, and two heaters 72 are arranged in the upper and lower parts in the main heating zone Z2. .
  • the motor 12 is disposed so as to face the upper and lower portions of the conveyor 80, and rotates the fan 74 disposed in each zone.
  • three motors 12 are arranged in the upper and lower parts in the preheating zone Z1, and two motors 12 are arranged in the upper and lower parts in the main heating zone Z2. .
  • the fan 74 is composed of, for example, a turbo fan or a sirocco fan, and is electrically connected to the motor 12.
  • the fan 74 is rotationally driven by the drive of the motor 12 and circulates hot air heated by the heater 72 inside the preheating zone Z1 and the main heating zone Z2 and blows it on the upper surface and the lower surface of the printed circuit board 70, respectively.
  • three fans 74 are arranged on the upper and lower sides in the preheating zone Z1, and two fans 74 are arranged on the upper and lower sides in the main heating zone Z2.
  • FIG. 19 shows a cross-sectional view of the reflow furnace body 40 cut along the cooling zone Z3 in a direction perpendicular to the transfer path X
  • FIG. 20 shows a cross-sectional view of the cooling zone Z3 cut along the transfer path X. Yes.
  • the cooling zone Z3 of the reflow furnace body 40 is an area for cooling the printed circuit board 70 heated in the main heating zone Z2 to solidify the molten solder.
  • a refrigerator 92 including a cooling member 94, a fan 74, a motor 12, and a flux recovery device 10D are provided.
  • a suction part S3 and a blowing part S4 that are partitioned by a plurality of partition walls are provided independently.
  • the suction portion S3 is a space portion for supplying air sucked from a suction hole formed in the nozzle 76 to the fan 74, as shown in FIGS.
  • the blowing part S ⁇ b> 4 is a space part for supplying the air blown from the fan 74 to the blowing hole formed in the nozzle 76.
  • the cooling member 94 is disposed in the suction portion S3 below the nozzle 76, and cools the gas sucked from the suction hole of the nozzle 76.
  • the cooling member 94 includes a cooling pipe 94a extending orthogonally to the transport path X (Y direction), and a plurality of fins 94b having a disk shape attached along the longitudinal direction of the cooling pipe 94a.
  • four cooling members 94 are arranged in parallel along the transport path X at a predetermined interval.
  • a horizontal plate 15 is provided between the cooling member 94 and the fan 74.
  • An inflow port 15 a for supplying the air cooled by the cooling member 94 to the lower fan 74 is formed at a substantially central portion (front surface of the fan) of the horizontal plate 15.
  • the cooling pipe 94a has a pipe shape as an example, and the pipe itself is cooled when a cooling medium such as cooling water or air passes through the pipe.
  • the fan 74 is constituted by, for example, a turbo motor or the like, and is installed below the inflow port 15a of the horizontal plate 15.
  • the fan 74 is driven to rotate through the rotating shaft 14 by driving the motor 12, and blows the air cooled by the cooling member 94 onto the lower surface of the printed circuit board 70.
  • An unillustrated outlet for supplying the cool air sucked in by the fan 74 to the blowing portion S4 is formed in the unillustrated partition wall located on the side of the fan 74.
  • the motor 12 is attached to the outer surface portion of the casing constituting the reflow furnace main body 40 and rotationally drives the fan 74 via the rotary shaft 14.
  • one fan 74, a heater 72, and a cooling member 94 are arranged in the upper and lower sides in the cooling zone Z3.
  • the motor 12 constitutes an example of a drive unit.
  • FIG. 21 is a perspective view showing an installation example of the flux recovery apparatus 10D.
  • 22 is a perspective view showing an example of the configuration of the reflow furnace 100A including the flux recovery apparatus 10D
  • FIG. 23 is a sectional view thereof
  • FIG. 24 is an exploded perspective view thereof.
  • FIG. 25 shows a configuration example of the lid portion 26 that constitutes the discharge pipe 24. Since the liquid flux deposited on the motor base 16 flows downward due to its own weight, the flux recovery device 10D is basically installed only on the lower side of the transport conveyor 80 of the reflow furnace 100A shown in FIG. And
  • the flux recovery apparatus 10D includes a motor base 16, a drain part 20, a drain pipe 38, a discharge pipe 24, a recovery container 34, and a decompression part 60A.
  • the motor base 16 has a disk shape having an outer diameter slightly larger than that of the fan 74, and is made of a metal material excellent in corrosion resistance and heat resistance such as stainless steel (SUS) or aluminum.
  • the motor base 16 is a member that supports a motor 12 described later, and constitutes an example of a base member.
  • an inclined surface 16a is formed which is inclined so that the height of the flat surface portion decreases from the peripheral portion toward the rotating shaft 14 (center portion).
  • the drain portion 20 is formed in the peripheral portion of the rotating shaft 14, the flux accumulated on the motor base 16 by the inclined surface 16 a can efficiently flow to the drain portion 20.
  • the motor 12 is attached to the back side of the motor base 16 (the side opposite to the fan 74) via the central drain block 22.
  • the motor 12 is connected to, for example, a commercial power supply unit (not shown), and rotates the fan 74 via the rotary shaft 14 based on an instruction from a control device (not shown).
  • a seal member for preventing entry of flux fumes and outside air (atmosphere) into the gap between the rotating shaft 14 and the central drain block 22. 32 is inserted.
  • a contact-type seal member such as an oil seal, V-packing, or Teflon (registered trademark) seal
  • a non-contact-type seal member for example, a labyrinth seal
  • an example using a V packing and a Teflon (registered trademark) seal is shown.
  • the drain part 20 discharges the flux accumulated on the motor base 16 from the motor base 16 to the outside.
  • the drain portion 20 is constituted by a valley portion (groove portion) and is formed along the circumferential direction of the rotating shaft 14 located at the center of the motor base 16.
  • the reason why the drain portion 20 is formed in the central portion of the motor base 16 is that the flux gathers at the central portion (rotating shaft 14) of the motor base 16 due to the wind toward the center generated when the fan 74 rotates. is there.
  • the drain portion 20 has an inclined surface 20 c that is inclined from a planar position of the motor base 16 toward a drain pipe 38 (discharge port 46) provided on the back side of the motor base 16.
  • a discharge port 46 for discharging the flux that has flowed into the drain portion 20 to the outside is formed in the wall surface portion 20d located on the downstream side of the inclined surface 20c of the drain portion 20.
  • the drain pipe 38 communicates with a discharge port 46 formed in the drain portion 20, and supplies the flux that has flowed into the drain portion 20 to the recovery container 34.
  • the drain pipe 38 has a drain pipe main body 38a, a flange portion 38b, and an insertion portion 38c.
  • the drain pipe body 38 a extends obliquely downward from the discharge port 46, and guides the flux discharged from the discharge port 46 of the drain portion 20 to the subsequent discharge pipe 24.
  • the insertion portion 38c protrudes in a cylindrical shape from the distal end portion of the drain pipe main body 38a, and its outer diameter D1 is selected to be equal to or smaller than the inner diameter D2 of the discharge pipe 24, so that it can be inserted into and removed from the inside of the discharge pipe 24 ( Engagement) is possible. As a result, the insertion portion 38 c enters deeper than the upper end inlet of the discharge pipe 24.
  • the flange portion 38b is provided to extend outward from the proximal end of the insertion portion 38c, and is configured in a rectangular shape in plan view corresponding to the shape of the packing 36 described later. As shown in FIG. 24, screw holes 38d for attaching the discharge pipe 24 are formed at the four corners of the flange portion 38b.
  • the discharge pipe 24 has a flange portion 24a, a discharge pipe main body 24b, and a lid portion 26, as shown in FIGS.
  • the upper end side of the discharge pipe main body 24b extends obliquely downward along the extending direction of the drain pipe main body 38a, and is bent in a vertical direction slightly above the middle portion in the longitudinal direction to extend a predetermined length.
  • the flange portion 24a is provided to extend outward at the end of the discharge pipe main body 24b on the drain pipe 38 side, and is configured in a rectangular shape in plan view corresponding to the shape of the packing 36 described later.
  • screw holes 24c to be attached to the drain pipe 38 are formed in the four corner portions of the flange portion 24a.
  • the lid portion 26 functions as a lid for a collection container 34 described later, and is attached to the lower end portion of the discharge pipe main body 24b.
  • the lid portion 26 has a top surface portion 26a having a diameter substantially the same as the outer diameter of the collection container 34, and a side wall portion 26b formed on the periphery of the top surface portion 26a.
  • a thread groove 26c corresponding to the thread groove 34b of the collection container 34 is formed on the inner peripheral surface of the side wall portion 26b.
  • a cylindrical projecting portion 26d that communicates with the discharge pipe main body 24b and projects in the vertical direction is provided on the inner surface side of the top surface portion 26a.
  • the protruding portion 26d functions as a breakwater for preventing the flux flowing into the collection container 34 from the discharge pipe 24 from adhering to the inner surface of the top surface portion 26a, the thread groove 26c of the side wall portion 26b, or the like.
  • the collection container 34 constitutes an example of a flux collection unit, and is connected to the drain pipe 38 via the discharge pipe 24 and flows through the drain part 20, the discharge port 46, the drain pipe 38 and the discharge pipe 24. Accommodates flux.
  • the collection container 34 includes a cylindrical container body 34a having an open top and a bottom at the bottom.
  • a thread groove 34b is formed along the circumferential direction on the periphery of the upper end of the container body 34a. By screwing the thread groove 34 b into the thread groove 26 c of the lid portion 26, the collection container 34 can be detachably attached to the discharge pipe 24.
  • the collection container 34 is selected to have a size that can be easily removed by an operator and can accommodate a certain amount of flux.
  • the collection container 34 may be made of a transparent material so that the amount of flux collected in the collection container 34 can be easily confirmed. Since the collection container 34 is attached to the end of the discharge pipe 24 extending in the vertical direction, the attachment angle is also in the vertical direction. Therefore, for example, compared with the case where the collection container 34 is attached obliquely, the amount of flux accommodated can be increased.
  • the screw holes 24c of the flange portion 24a of the discharge pipe 24 thus configured, the screw holes 36b of the packing 36, and the screw holes 38d of the flange portion 38b of the drain pipe 38 are respectively shown in FIG. Further, the screw 68 is tightened, and the discharge pipe 24 is detachably attached to the drain pipe 38 via the packing 36.
  • the decompression section 60A is for decompressing the collection container 34 and sucking and collecting the flux into the collection container 34.
  • the suction portion S3 (see FIGS. 19 and 20), which is the negative pressure in the cooling zone Z3, is provided with a pressure reducing portion 60A that communicates with the recovery container 34 to reduce the pressure in the recovery container 34. It is what I did.
  • the decompression unit 60 ⁇ / b> A includes a container-side connecting part 62, a connecting tube 64, and a main body-side connecting part 66.
  • the container side connecting portion 62 is attached to a position not overlapping the discharge pipe 24 on the outer surface of the top surface portion 26 a of the lid portion 26, and communicates with the inside of the collection container 34 via the lid portion 26.
  • the main body side connecting portion 66 is attached to the side wall portion 40c of the casing constituting the cooling zone Z3 of the reflow furnace main body 40, and communicates with the suction portion S3 of the cooling zone Z3 via the side wall portion 40c.
  • One end of the connecting tube 64 is connected to the container side connecting portion 62, and the other end is connected to the main body side connecting portion 66.
  • suction part S3 becomes a negative pressure.
  • the air sucked from the suction hole formed in the nozzle 76 is sucked into the suction portion S ⁇ b> 3, and the sucked air is cooled by passing through the cooling member 94 provided below the nozzle 76.
  • the cooled air is supplied to the fan 74 through the inflow port 15a.
  • the cold air supplied to the fan 74 is blown out from the side of the fan 74 and blown out from the blowout hole formed in the nozzle 76 via the blowout portion S4.
  • the collection container 34 and the suction part S3 of the cooling zone Z3 are connected by the connecting tube 64. Therefore, since the pressure on the collection container 34 side is reduced and the flux is sucked, the flux accumulated on the motor base 16 is accommodated in the collection container 34.
  • the pressure on the collection container 34 side is reduced by connecting the collection container 34 and the suction part S3 of the cooling zone Z3 by the connecting tube 64. Therefore, the stagnation of the flux on the inclined surface 16a can be prevented. As a result, re-evaporation of the stagnant flux on the motor base 16 and contamination and dripping due to the stagnant flux can be avoided, so that the maintenance time of the reflow furnace 100A can be shortened.
  • the attachment angle of the collection container 34 attached to the discharge pipe 24 is also vertical. Therefore, the amount of flux that can be accommodated in the collection container 34 can be increased as compared with the case where the collection container 34 is attached obliquely. Thereby, the collection frequency of the flux inside the collection container 34 can be reduced, and the maintenance time of the user can be shortened.
  • the insertion portion 38c is provided in the drain pipe 38, and the insertion portion 38c is inserted into the inside of the discharge pipe 24 so as to enter deeper than the upper end inlet of the discharge pipe 24, the outer peripheral surface of the drain pipe 38 and the discharge pipe 24 are inserted.
  • the flux can be reliably prevented from entering the gap with the inner peripheral surface. Thereby, sticking of the flux at the connecting portion between the drain pipe 38 and the discharge pipe 24 can be prevented. Further, even when the flux is fixed, the flux is fixed to the inside of the drain pipe 38. Therefore, the discharge pipe 24 attached to the outside of the drain pipe 38 can be easily detached from the drain pipe 38. As a result, the burden of maintenance work can be reduced and the maintenance work time can be shortened.
  • the fifth embodiment is different from the fourth embodiment in that the ejector 50 is used to forcibly reduce the pressure inside the collection container 34.
  • the other components such as the reflow furnace 100B and the flux recovery apparatus 10E are the same as those of the reflow furnace 100A and the flux recovery apparatus 10D described in the fourth embodiment. The detailed description is abbreviate
  • FIG. 26 shows an example of the configuration of the flux recovery apparatus 10E in the cooling zone Z3 of the reflow furnace 100B in which the decompression unit 60B having the ejector 50 is employed.
  • the decompression unit 60B includes an ejector 50, an ejector side connection portion 58, a container side connection portion 62, a connection tube 64, and a main body side connection portion 66.
  • the ejector 50 is a member that forcibly pulls the pressure on the collection container 34 side into the cooling zone Z3 by utilizing the fact that the periphery of the flow becomes negative pressure when gas is injected in a certain direction.
  • FIG. 27 shows an example of a cross-sectional configuration of the ejector 50.
  • a nitrogen supply path 50a extending in the horizontal direction and a suction path 50b branched downward from the middle of the nitrogen supply path 50a are provided.
  • the end of the nitrogen supply path 50a opposite to the reflow furnace body 40 is an inlet 50c, and the other end is an outlet 50d.
  • the lower end of the suction path 50b is a suction port 50e.
  • the branch portion of the nitrogen supply path 50a is provided with a recess 50f that is narrowed inward.
  • connection tube 64 is connected to the suction port 50 e of the ejector 50 via an ejector side connection portion 58.
  • a container side connecting portion 62 is connected to the other end of the connecting tube 64.
  • One end of a nitrogen supply tube 56 is connected to the inlet 50 c of the ejector 50 via a nitrogen supply connecting portion 54.
  • a nitrogen generator (not shown) is attached to the other end of the nitrogen supply tube 56.
  • the outlet 50d of the ejector 50 is connected to the side wall 40c of the cooling zone Z3 of the reflow furnace body 40.
  • the pressure (gas) on the collection container 34 side is drawn into the suction path 50b of the ejector 50 through the connection tube 64, and is mixed with the nitrogen flowing through the nitrogen supply path 50a instantaneously at the branch portion.
  • the mixed nitrogen and the gas on the collection container 34 side flow into the suction part S3 of the cooling zone Z3.
  • the negative pressure generated when nitrogen is injected is used to decompress the inside of the collection container 34 and forcibly suck the flux into the collection container 34.
  • the pressure equalization method of the fifth embodiment is the pressure obtained by directly connecting the recovery container 34 and the cooling zone Z3 using the connection tube 64 described in the fourth embodiment. It can be suitably used when the suction force is insufficient. That is, by using the ejector 50, the flux accumulated on the inclined surface 16 a of the motor base 16 is caused to flow to the drain portion 20 with a larger pulling force (negative pressure) by nitrogen injection, and the flux flows into the collection container 34. Can be forcibly aspirated. As a result, stagnation of the flux on the inclined surface 16a can be prevented, so that re-evaporation of the stagnation flux on the motor base 16, contamination and sag due to the stagnation flux can be avoided, and maintenance of the reflow furnace 100B. Time can be shortened.
  • the sixth embodiment is different from the fourth embodiment in that the drain portion 20 is formed not at the central portion of the motor base 16 but at two locations on the peripheral portion of the motor base 16.
  • the configuration of the other reflow furnace 100C and the like is the same as the configuration of the reflow furnace 100A described in the above-described fourth embodiment, common components are denoted by the same reference numerals, and detailed description thereof will be omitted. Omitted.
  • the flux recovery apparatus 10F includes a motor base 16, a drain part 20, a discharge pipe 24, a recovery container 34, and a decompression part 60C.
  • the drain part 20 has a drain pipe 20a, a flange part 20b, and an insertion part 20e.
  • the drain pipe 20 a is formed so as to penetrate the motor base 16 obliquely outward and downward from the peripheral edge portion of the upper surface of the motor base 16.
  • the drain portions 20 are provided at two locations, and the upper end openings of these drain portions 20, 20 are formed at positions where the peripheral portions of the motor base 16 face each other.
  • the upper surface portion of the motor base 16 is an inclined surface 16 a that is inclined from the central portion of the motor base 16 toward the drain portion 20 formed outward. As a result, the liquefied flux flows outward along the inclined surface 16a, flows into the drain portion 20, and is discharged to the recovery container 34 described later.
  • the insertion portion 20e is provided at the distal end portion of the drain pipe 20a, and its outer diameter D1 is selected to be equal to or smaller than the inner diameter D2 of the discharge pipe 24, so that it can be inserted into and removed from (engaged with) the discharge pipe 24. Yes.
  • the flange portion 20 b is provided at the proximal end of the insertion portion 20 e and is configured in a rectangular shape in plan view corresponding to the shape of the packing 36. Screw holes (not shown) for attaching the discharge pipe 24 are formed at the four corners of the flange portion 20b.
  • the discharge pipe 24 has a flange part 24a, a discharge pipe body 24b, and a lid part 26.
  • the upper end side of the discharge pipe main body 24b extends obliquely downward along the extending direction of the drain pipe 20a, is bent in the vertical direction slightly above the middle part, and extends downward by a predetermined length. ing.
  • the flange portion 24 a is provided at the end of the discharge pipe main body 24 b on the drain portion 20 side, and is configured in a rectangular shape in plan view corresponding to the shape of the packing 36. Screw holes (not shown) for attachment to the drain part 20 are formed in each of the four corners of the flange part 24a.
  • the lid portion 26 functions as a lid for a collection container 34 described later, and is attached to the lower end portion of the discharge pipe main body 24b.
  • the lid portion 26 includes a top surface portion 26a having a diameter substantially the same as the outer diameter of the collection container 34, and a side wall portion 26b formed on the periphery of the top surface portion 26a.
  • a thread groove corresponding to the thread groove of the collection container 34 is formed on the inner peripheral surface of the side wall portion 26b (not shown).
  • a cylindrical shape for preventing the flux flowing into the collection container 34 from the drain portion 20 from adhering to the inner peripheral surface of the top surface portion 26a, the thread groove of the side wall portion 26b, or the like. 26d is provided on the inner surface side of the top surface portion 26a.
  • the collection container 34 is detachably attached to the lid part 26 and accommodates the flux flowing in via the drain part 20 and the discharge pipe 24.
  • the collection container 34 includes a cylindrical container body 34a having an open top and a bottom at the bottom.
  • a thread groove is formed on the periphery of the upper end of the container body 34a along the circumferential direction (not shown).
  • the decompression unit 60 ⁇ / b> C is installed in each of the two collection containers 34 provided on both sides of the motor 12.
  • the decompression unit 60C includes a container side connection part 62, a connection tube 64, and a main body side connection part 66 (not shown).
  • the container side connecting portion 62 is attached to a position not overlapping the discharge pipe 24 on the outer surface of the top surface portion 26 a of the lid portion 26, and communicates with the inside of the collection container 34 via the lid portion 26.
  • the main body side connecting portion 66 is attached to the side wall portion 40c constituting the cooling zone Z3 of the reflow furnace main body 40 and communicates with the suction portion S3 of the cooling zone Z3 (see FIG. 19).
  • One end of the connecting tube 64 is connected to the container side connecting portion 62, and the other end is connected to the main body side connecting portion 66.
  • the pressure on the collection container 34 side is reduced by the pressure reducing portion 60C provided in each. can do.
  • the stagnation of the flux on the inclined surface 16a can be prevented.
  • dirt and sagging due to the stagnant flux can be avoided, and the flux can be efficiently allowed to flow into the recovery container 34.
  • the maintenance time of the furnace 100C can be shortened.
  • connection tube 64 is connected to the suction part S3 of the cooling zone Z3, but the present invention is not limited to this.
  • a suction device that generates a negative pressure may be provided in the reflow furnace 100, and the other end of the connection tube 64 may be connected to the suction device.
  • the suction device may be provided with a function for adjusting the suction level, for example, so that the suction level can be adjusted according to the amount of flux deposited on the base member.
  • the flux on the base member can flow into the collection container 34 more efficiently. Furthermore, if there is a space part in the reflow furnace 100 that generates negative pressure other than the suction part S3 of the cooling zone Z3 described above, the other end of the connecting tube 64 can be connected to the space part.
  • the decompression units 60A, 60B, 60C are installed in the cooling zone Z3 in detail, but each of the preheating zone Z1 and the main heating zone Z2 is also described.
  • the decompression units 60A, 60B, and 60C can be applied. Thereby, also in the preheating zone Z1 and this heating zone Z2, accumulation of the flux on the motor base 16 can be suppressed effectively.
  • 10A, 10B, 10C, 10D, 10E, 10F ... Flux recovery device, 12 ... Motor, 14 ... Rotary shaft, 16 ... Motor base (base member), 16a ... Inclined surface, 18 ... High neck collar part, 20 ... Drain part, 30A, 30C ... Flux recovery part, 32 ... Drain pipe, 34 ... Recovery container (flux recovery part), 38 ... Drain pipe (First discharge pipe), 40 ... reflow furnace body, 48 ... pipe pipe (second discharge pipe), 50 ... ejector (decompression unit), 60A, 60B, 60C ... decompression unit , 70 ... Printed circuit board, 72 ... Heater, 74 ... Fan, 80 ... Conveyor, 90 ...
  • Heater for flux heating 100, 100A, 100B, 100C, 100D ... Reflow furnace , S ... suction unit, S4 ⁇ balloon part, Z1 ⁇ pre-heating zone, Z2 ⁇ main heating zone, Z3 ⁇ cooling zone

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  • Electric Connection Of Electric Components To Printed Circuits (AREA)

Abstract

L'invention concerne un four à reflux dans lequel, pour éviter qu'un flux vaporisé adhère et se solidifie sur les arbres en rotation des moteurs de rotation de ventilateurs disposés dans une zone de préchauffage, une zone de chauffage principale et une zone de refroidissement, le flux vaporisé est récupéré efficacement et de manière fiable dans un état liquide, le flux présentant une fluidité supérieure à la fluidité avec laquelle le flux est solidifié. Une section d'écoulement (20) qui constitue un dispositif de récupération du flux (10A) est formée sur la périphérie d'un arbre en rotation (14). Selon l'invention, ladite périphérie se trouve sur le côté qui fait face au ventilateur à la base d'un moteur (16). La surface de la section d'écoulement (20) qui fait face au ventilateur forme une surface inclinée (20A) qui s'incline en direction d'une sortie (46) aménagée sur le côté arrière de la base du moteur (16) depuis la position de la surface plate de la base du moteur (16). Le flux collecté vers la portion centrale de la base du moteur (16) par l'entraînement rotatif du ventilateur est amené à s'écouler dans la section d'écoulement (20) formée au niveau de la section centrale de la base du moteur (16) et à s'écouler le long de la surface inclinée (20A), puis le flux est stocké dans un récipient de récupération (34) depuis la section d'écoulement (20) par le biais de la sortie (46), d'un tube d'écoulement et d'un tuyau (48).
PCT/JP2010/071903 2009-12-11 2010-12-07 Four à reflux WO2011071041A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US13/514,969 US9243845B2 (en) 2009-12-11 2010-12-07 Reflow furnace
CN201080056269.1A CN102652044B (zh) 2009-12-11 2010-12-07 回流炉
PL10835961T PL2511036T3 (pl) 2009-12-11 2010-12-07 Piec rozpływowy
KR1020127014907A KR101396657B1 (ko) 2009-12-11 2010-12-07 리플로우로
EP10835961.3A EP2511036B1 (fr) 2009-12-11 2010-12-07 Four à reflux

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2009282261A JP5540680B2 (ja) 2009-12-11 2009-12-11 リフロー炉
JP2009-282261 2009-12-11
JP2010101326A JP5565071B2 (ja) 2010-04-26 2010-04-26 リフロー装置
JP2010-101326 2010-04-26

Publications (1)

Publication Number Publication Date
WO2011071041A1 true WO2011071041A1 (fr) 2011-06-16

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EP (1) EP2511036B1 (fr)
KR (1) KR101396657B1 (fr)
CN (1) CN102652044B (fr)
HU (1) HUE039943T2 (fr)
MY (1) MY158726A (fr)
PL (1) PL2511036T3 (fr)
TW (1) TWI524963B (fr)
WO (1) WO2011071041A1 (fr)

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US9226407B2 (en) * 2002-07-01 2015-12-29 Semigear Inc Reflow treating unit and substrate treating apparatus
CN103128406B (zh) * 2013-03-04 2015-04-22 宁波恒升电气有限公司 一种方便焊锡废料回收的焊锡熔化炉
DE102013104806A1 (de) * 2013-05-08 2014-11-13 Sandvik Materials Technology Deutschland Gmbh Bandofen
CN108237298A (zh) * 2016-12-26 2018-07-03 上海朗仕电子设备有限公司 一种用于回流焊炉的吹风装置
EP3994404B1 (fr) * 2019-07-03 2024-07-24 Corning Incorporated Configuration d'échappement de four navette
WO2021003045A1 (fr) * 2019-07-03 2021-01-07 Corning Incorporated Four à navette à rétention de chaleur rayonnante améliorée
CN111404303B (zh) * 2020-03-27 2021-11-19 Oppo（重庆）智能科技有限公司 回流炉冷却马达组件及其固定装置
WO2022102156A1 (fr) 2020-11-12 2022-05-19 千住金属工業株式会社 Appareil de brasage
US11456274B1 (en) * 2021-08-31 2022-09-27 Yield Engineering Systems, Inc. Method of using a processing oven

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JPH07212034A (ja) * 1994-01-20 1995-08-11 Tamura Seisakusho Co Ltd 基板冷却装置
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MY158726A (en) 2016-11-15
EP2511036A4 (fr) 2017-04-26
TW201139031A (en) 2011-11-16
HUE039943T2 (hu) 2019-02-28
KR20120093345A (ko) 2012-08-22
CN102652044A (zh) 2012-08-29
US20120240424A1 (en) 2012-09-27
EP2511036A1 (fr) 2012-10-17
KR101396657B1 (ko) 2014-05-16
CN102652044B (zh) 2015-06-10
EP2511036B1 (fr) 2018-08-08
TWI524963B (zh) 2016-03-11
PL2511036T3 (pl) 2019-01-31
US9243845B2 (en) 2016-01-26

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