JP5565071B2 - Reflow device - Google Patents

Description

  The present invention relates to a reflow apparatus for soldering an electronic component onto a substrate by performing a reflow process on the substrate on which the electronic component is mounted on 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 apparatus equipped with a flux collecting apparatus.

  When soldering an electronic component on a printed wiring board, a reflow device is generally used. The reflow apparatus includes a conveyor that conveys the printed wiring board and a reflow apparatus main body that conveys the printed wiring board by the conveyor. The interior of the reflow apparatus main body is divided into a preheating zone, a heating zone, and a cooling zone. A heater and a motor are installed in the preheating zone and the heating zone, and a cooling member, a cooling fan, and a motor are installed in the cooling zone.

  In the reflow process, a substrate on which a solder paste has been printed in advance is conveyed into the reflow apparatus. The solder paste printed on the board contains powder solder, solvent, and flux. Of these, 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.

  As for the board | substrate conveyed in the reflow apparatus, the solvent contained in paste solder volatilizes in a preheating zone. Subsequently, hot air is blown onto the substrate in the heating zone to melt the paste solder. 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.

  By the way, in the heating process described above, the flux is vaporized by the heating by the heater and fills the reflow apparatus. In this way, the vaporized flux filled in the reflow body is generally cleaned through a removal device that removes the flux component provided outside the muffle, and then enters the muffle through the circulation path. Returned again. However, in the reflow process, as the fan is driven to rotate, a flow that flows around the back surface of the fan is generated, so that a part of the flux evaporated by this flow may flow around the back surface of the fan. The vaporized flux that has circulated to the back side of the fan becomes a fluid liquid flux as the temperature decreases. In this case, the liquefied flux is placed on the base member provided on the back side of the fan. The problem of staying occurs.

  In order to solve this problem, a reflow is provided in which a drain portion for flux recovery is provided at the peripheral portion of the base member provided on the back side of the fan, and an inclined surface that is inclined from the center of the base member toward the drain portion is provided. An apparatus has been proposed (see Patent Document 1). Also, using the fact that gas flows toward the center on the back side of the fan, a flux is provided for collecting the flux discharged from the drain portion on the drain side of the drain portion by providing a drain portion at the center of the base member A reflow apparatus in which a collection container is installed via a pipe has also been proposed. According to these reflow apparatuses, the flux accumulated on the base member can be efficiently recovered.

JP 2008-272793 A

  However, the reflow apparatus disclosed in Patent Document 1 and the like has the following problems. That is, in recent years, a highly confidential seal member is attached between the rotating shaft of the motor and the central drain block in the periphery thereof. Therefore, the pressure in the vicinity does not leak out to the outside, and the back side of the fan and the inside of the flux collection container are highly airtight. In such a highly airtight environment, even if an inclined surface inclined toward the drain portion of the base member is provided as in Patent Document 1, the fluidity of the flux deteriorates, and the flux is on the motor base. There was a case where it stagnated. As a result, there is a problem that contamination due to flux re-evaporation or flux stagnation is caused.

  Further, in the conventional reflow apparatus, even if the flux flows from the base member to the drain portion, the pipe disposed between the drain portion and the flux collecting device extends obliquely, so that the drain portion In some cases, the flowed flux stagnates in the middle of the pipe. In this case, there arises a problem that the flux accumulates and adheres in the middle of the pipe and clogs the pipe. The problem of sticking of flux in piping often occurs particularly at a connection portion connecting the piping.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a reflow device capable of suppressing the retention of flux on a base member or piping.

  In order to solve the above problems, a reflow device according to the present invention is for recovering flux generated by a reflow process of a reflow device body having a drive unit and a fan connected to the drive unit via a rotating shaft. A reflow apparatus including a flux recovery apparatus, wherein the flux recovery apparatus is provided on a side opposite to a base member attached to the main body of the reflow apparatus and a fan of the base member, and is provided in a peripheral portion of the rotating shaft, The drain part which flows in the flux which generate | occur | produced by this and discharge | emits outside, the flux collection | recovery part which collect | recovers flux via a drain part, and the pressure reduction part which decompresses the inside of this flux collection | recovery part are provided.

  According to the present invention, the inside of the flux collection unit is depressurized by the decompression unit, so that the flux deposited on the base member, the drain unit or the like can be forcibly sucked into the flux collection unit.

It is a figure which shows the structural example of the reflow apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows the structural example of a cooling zone (the 1). It is a figure which shows the structural example of a cooling zone (the 2). It is a perspective view which shows the example of installation of a decompression part. It is a perspective view which shows the structural example of a flux collection | recovery apparatus. It is sectional drawing which shows the structural example of a flux collection | recovery apparatus. It is a disassembled perspective view which shows the structural example of a flux collection | recovery apparatus. It is a figure which shows the structural example of the cover part of a discharge pipe. It is a perspective view which shows the example of installation of the decompression part of the reflow apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the structural example of the ejector which comprises a pressure reduction part. It is a perspective view which shows the structural example of the flux collection | recovery apparatus which concerns on the 3rd Embodiment of this invention. It is a disassembled perspective view which shows the structural example of the flux collection | recovery apparatus which concerns on the 3rd Embodiment of this invention.

Hereinafter, the best mode for carrying out the invention (hereinafter referred to as an embodiment) will be described.
<1. First Embodiment>
[Configuration example of reflow equipment]
FIG. 1 shows an example of the configuration of a reflow apparatus 100A according to the present invention. A reflow device 100A according to the present invention includes a reflow device main body 10 and a conveyor 92. The reflow apparatus main body 10 includes a tunnel-shaped housing having a carry-in port 10a and a carry-out port 10b. The conveyor 92 extends along the conveyance path X from the carry-in port 10a to the carry-out port 10b, and the printed circuit board 90 is moved from the carry-in port 10a to the carry-out port 10b of the reflow apparatus main body 10 at a predetermined speed. Transport.

  Inside the reflow apparatus main body 10, a preheating zone Z1, a heating zone Z2, and a cooling zone Z3 are sequentially provided along the transport path X. The preheating zone Z1 is an area for volatilizing a solvent contained in the solder paste, and a heater 12, a fan 14, a motor 16, and the like are installed. As the solder paste, for example, lead-free solder containing tin-silver-copper, tin-zinc-bismuth or the like is used. The melting point of the molten solder is, for example, about 180 ° C. to 220 ° C. The heating zone Z2 is an area for melting the solder by heating the printed circuit board 90, and the heater 12, the fan 14, the motor 16, and the like are installed. Note that, in the preheating zone Z1 and the heating zone Z2, the configurations of the heater 12, the fan 14, and the motor 16 are generally different by using only the temperature setting using the same configuration, but different configurations. It is also good. 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 12 is disposed so as to face the upper and lower sides of the conveyor 92, and heats the air inside the preheating zone Z1 and the heating zone Z2. In the case of this example, as shown in FIG. 1, three heaters 12 are arranged in the upper and lower parts in the preheating zone Z1, and two heaters 12 are arranged in the upper and lower parts in the heating zone Z2.

  The motor 16 is disposed so as to face the upper and lower portions of the conveyor 92, and rotationally drives the fan 14 disposed in each zone. In the case of this example, as shown in FIG. 1, three motors 16 are arranged in the upper and lower parts in the preheating zone Z1, and two motors 16 are arranged in the upper and lower parts in the heating zone Z2.

  The fan 14 is composed of, for example, a turbo fan or a sirocco fan and is electrically connected to the motor 16. The fan 14 is driven to rotate by driving the motor 16, and the hot air heated by the heater 12 is circulated inside the preheating zone Z 1 and the heating zone Z 2 and blown to the upper surface and the lower surface of the printed circuit board 90. In the case of this example, three fans 14 are arranged on the upper and lower sides in the preheating zone Z1, and two fans 14 are arranged on the upper and lower sides in the heating zone Z2.

[Configuration example of cooling zone]
Next, an example of the configuration of the cooling zone Z3 will be described. In the following description, the configuration of the cooling zone Z3 provided on the lower side of the reflow apparatus body 10 will be described. FIG. 2 is a cross-sectional view of the reflow apparatus main body 10 cut along the cooling zone Z3 in a direction perpendicular to the transport path X. FIG. 3 is a cross-sectional view of the cooling zone Z3 cut along the transport path X. Yes.

  As shown in FIGS. 1 to 3, the cooling zone Z <b> 3 of the reflow apparatus main body 10 is an area for cooling the printed board 90 heated in the heating zone Z <b> 2 to solidify the molten solder. The cooling zone Z3 is provided with a cooling member 18, a fan 14, a motor 16, and a flux recovery device 80A. In the cooling zone Z3 in which these members are arranged, a suction part S1 and a blowing part S2 partitioned by a plurality of partition walls are provided independently. As shown in FIGS. 2 and 3, the suction part S <b> 1 is a space part for supplying air sucked from a suction hole formed in the nozzle 70 to the fan 14. As shown in FIG. 3, the blowout part S <b> 2 is a space part for supplying the air blown from the fan 14 to the blowout hole formed in the nozzle 70.

  The cooling member 18 is disposed in the suction portion S <b> 1 below the nozzle 70, and cools the gas sucked from the suction hole of the nozzle 70. The cooling member 18 includes a cooling pipe 18a extending orthogonally to the transport path X (Y direction), and a large number of fins 18b having a disk shape attached along the longitudinal direction of the cooling pipe 18a. In this example, as shown in FIG. 3, four cooling members 18 are arranged in parallel along the transport path X at a predetermined interval. A horizontal plate 15 is provided between the cooling member 18 and the fan 14. An inflow port 15 a for supplying the air cooled by the cooling member 18 to the lower fan 14 is formed in a substantially central portion (front surface of the fan) of the horizontal plate 15. The cooling pipe 18a 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 14 is configured by, for example, a turbo motor or the like, and is installed below the inflow port 15a of the horizontal plate 15. The fan 14 is driven to rotate through the rotating shaft 17 by driving the motor 16 and blows the air cooled by the cooling member 18 onto the lower surface of the printed circuit board 90. An unillustrated outlet for supplying the cool air sucked in by the fan 14 to the blowing portion S2 is formed in the unillustrated partition wall located on the side of the fan 14.

  The motor 16 is attached to the outer surface portion of the casing constituting the reflow apparatus main body 10, and rotationally drives the fan 14 via the rotation shaft 17. In the case of this example, as shown in FIG. 1, one fan 14, a heater 12, and a cooling member 18 are arranged in the upper and lower sides in the cooling zone Z3. The motor 16 constitutes an example of a drive unit.

  Next, an example of the configuration of the flux recovery apparatus 80A provided on the outer surface side of the casing that forms the cooling zone Z3 will be described. FIG. 4 is a perspective view showing an installation example of the flux recovery apparatus 80A. 5 is a perspective view showing an example of the configuration of the reflow apparatus 100A including the flux recovery apparatus 80A, FIG. 6 is a sectional view thereof, and FIG. 7 is an exploded perspective view thereof. FIG. 8 shows a configuration example of the lid portion 33 that constitutes the discharge pipe 32. Since the liquid flux accumulated on the motor base 20 flows downward due to its own weight, the flux recovery device 80A is basically installed only on the lower side of the conveyor 92 of the reflow device 100A shown in FIG. To do.

  4-8, the flux collection | recovery apparatus 80A is provided with the motor base 20, the drain part 22, the drain pipe | tube 28, the discharge pipe 32, the container 34 for collection | recovery, and the pressure reduction part 40A. The motor base 20 has a disk shape having a slightly larger outer diameter than the fan 14, and is made of a metal material having excellent corrosion resistance and heat resistance, such as stainless steel (SUS) or aluminum. The motor base 20 is a member that supports a motor 16 described later, and constitutes an example of a base member. On the surface of the motor base 20 facing the fan 14, an inclined surface 21 is formed that is inclined so that the height of the plane portion decreases from the peripheral portion toward the rotation shaft 17 (center portion). As will be described later, since the drain portion 22 is formed in the peripheral portion of the rotating shaft 17, the flux accumulated on the motor base 20 by the inclined surface 21 can efficiently flow to the drain portion 22.

  The motor 16 is attached to the back side of the motor base 20 (the side opposite to the fan 14) via a central drain block 26. The motor 16 is connected to, for example, a commercial power supply unit (not shown), and rotates the fan 14 via the rotary shaft 17 based on an instruction from a control device (not shown).

  Between the outer peripheral surface of the rotating shaft 17 and the inner peripheral surface of the central drain block 26, a seal member for preventing entry of flux fumes and outside air (atmosphere) into the gap between the rotating shaft 17 and the central drain block 26. 24 is inserted. For the seal member 24, for example, 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), or the like is used. In this example, an example using a V packing and a Teflon (registered trademark) seal is shown.

  The drain part 22 discharges the flux accumulated on the motor base 20 from the motor base 20 to the outside. The drain portion 22 is constituted by a valley portion (groove portion) and is formed along the circumferential direction of the rotating shaft 17 located at the center of the motor base 20. The reason why the drain portion 22 is formed in the central portion of the motor base 20 is that the flux gathers at the central portion (rotating shaft 17) of the motor base 20 due to the wind toward the center generated when the fan 14 rotates. is there. As shown in FIG. 5, the drain portion 22 has an inclined surface 22 c that is inclined from a planar position of the motor base 20 toward a drain pipe 38 (discharge port 23) provided on the back side of the motor base 20. As shown in FIG. 5, a discharge port 23 for discharging the flux that has flowed into the drain portion 22 to the outside is formed in the wall surface portion 22 d positioned on the downstream side of the inclined surface 22 c of the drain portion 22.

  As shown in FIG. 7, the drain pipe 28 communicates with the discharge port 23 formed in the drain portion 22, and supplies the flux that has flowed into the drain portion 22 to the collection container 34. The drain pipe 28 includes a drain pipe main body 28a, a flange portion 28b, and an insertion portion 28c. The drain pipe main body 28 a extends obliquely downward from the discharge port 23, and guides the flux discharged from the discharge port 23 of the drain part 22 to the subsequent discharge pipe 32. The insertion portion 28c protrudes in a cylindrical shape from the distal end portion of the drain pipe main body 28a, and the outer diameter D1 is selected to be equal to or smaller than the inner diameter D2 of the discharge pipe 32, so that the insertion section 28c is inserted into and removed from the inside of the discharge pipe 32 Engagement) is possible. As a result, the insertion portion 28 c enters deeper than the upper end inlet of the discharge pipe 32. The flange portion 28b is provided to extend outward at the proximal end of the insertion portion 28c, and is configured in a rectangular shape in plan view corresponding to the shape of the packing 36 described later. As shown in FIG. 7, screw holes 28d for attaching the discharge pipe 32 are formed at the four corners of the flange portion 28b.

  As shown in FIGS. 6 and 7, the discharge pipe 32 includes a flange portion 32 a, a discharge pipe main body 32 b, and a lid portion 33. The upper end side of the discharge pipe main body 32b extends obliquely downward along the extending direction of the drain pipe main body 28a, and is bent in a vertical direction slightly above the middle portion in the longitudinal direction to extend a predetermined length. Exist. The flange portion 32a is provided to extend outward at an end portion on the drain pipe 28 side of the discharge pipe main body 32b, and is configured in a rectangular shape in plan view corresponding to the shape of the packing 36 described later. As shown in FIG. 7, screw holes 32c for attaching to the drain pipe 28 are formed in the four corners of the flange portion 32a.

  The lid portion 33 functions as a lid for a collection container 34 to be described later, and is attached to the lower end portion of the discharge pipe main body 32b. As shown in FIGS. 6 to 8, the lid portion 33 includes a top surface portion 33 a having substantially the same diameter as the outer diameter of the collection container 34, and a side wall portion 33 b formed on the periphery of the top surface portion 33 a. . As shown in FIG. 8, a thread groove 33c corresponding to the thread groove 34b of the collection container 34 is formed on the inner peripheral surface of the side wall portion 33b. A cylindrical projecting portion 33d that communicates with the discharge pipe main body 32b and projects in the vertical direction is provided on the inner surface side of the top surface portion 33a. The protrusion 33d functions as a breakwater to prevent the flux flowing into the collection container 34 from the discharge pipe 32 from adhering to the inner surface of the top surface portion 33a, the thread groove 33c of the side wall portion 33b, or the like.

  The collection container 34 constitutes an example of a flux collection unit, and is connected to the drain pipe 28 via the discharge pipe 32 and flows through the drain part 22, the discharge port 23, the drain pipe 28, and the discharge pipe 32. 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 screw groove 34 b into the screw groove 33 c of the lid portion 33, the collection container 34 can be detachably attached to the discharge pipe 32. 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. Since the collection container 34 is attached to the end of the discharge pipe 32 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.

  As shown in FIG. 7, the screw holes 32c of the flange portion 32a of the discharge pipe 32 thus configured, the screw holes 36b of the packing 36, and the screw holes 28d of the flange portion 28b of the drain pipe 28 are respectively shown in FIG. In addition, the screw 60 is tightened, and the discharge pipe 32 is detachably attached to the drain pipe 28 via the packing 36.

The decompression unit 40A is for decompressing the inside of the collection container 34 and sucking and collecting the flux into the collection container 34. As an example of means for depressurizing the inside of the collection container 34, as shown in FIG. 3, the back side of the fan 14, the drain pipe 28, the discharge pipe 32, and the collection container 34 are pressurized by the rotational drive of the fan 14. In this case, the suction portion S1 (see FIGS. 2 and 3), which is the negative pressure in the cooling zone Z3, is provided with a pressure reducing portion 40A that communicates with the recovery container 34 to reduce the pressure in the recovery container 34. It is what I did. The decompression unit 40 </ b> A includes a container side connection part 42, a connection tube 44, and a main body side connection part 46. The container-side connecting portion 42 is attached to a position that does not overlap the discharge pipe 32 on the outer surface of the top surface portion 33 a of the lid portion 33, and communicates with the inside of the collection container 34 via the lid portion 33. The main body side connecting portion 46 is attached to the side wall portion 10c of the casing constituting the cooling zone Z3 of the reflow apparatus main body 10, and communicates with the suction portion S1 of the cooling zone Z3 through the side wall portion 10c. One end of the connecting tube 44 is connected to the container side connecting portion 42, and the other end is connected to the main body side connecting portion 46.

[Operation example of reflow device]
Next, an example of the operation of the reflow apparatus 100A when the above-described decompression unit 40 is employed will be described. Hereinafter, the cooling zone Z3 will be described in detail. When the power on of the reflow device 100A is turned on, the conveyor 92 and the fan 14 are driven and the heater 12 is turned on. Then, nitrogen is injected into the reflow device body 10 in order to reduce the oxygen concentration inside the reflow device body 10.

  When the fan 14 is driven to rotate by driving the motor 16, a flow in the suction direction is generated on the front side of the fan 14. Therefore, suction part S1 becomes a negative pressure. Thereby, the air sucked from the suction hole formed in the nozzle 70 is sucked into the suction portion S <b> 1, and the sucked air is cooled by passing through the cooling member 18 provided below the nozzle 70. The cooled air is supplied to the fan 14 through the inlet 15a. The cool air supplied to the fan 14 is blown out from the side of the fan 14 and blown out from the blowout hole formed in the nozzle 70 via the blowout part S2. Thereby, cool air is blown to the lower surface side of the printed circuit board 90, and the printed circuit board 90 is cooled. The cold air blown on the lower surface of the printed circuit board 90 takes heat of the printed circuit board 90 and the temperature rises. The raised gas is sucked again from the suction hole of the nozzle 70 described above, cooled by the cooling member 18 and supplied to the fan 14. In the cooling zone Z <b> 3, such a gas circulation is repeatedly performed to cool the printed circuit board 90 conveyed by the conveyor 92.

  On the other hand, when the fan 14 is driven to rotate, pressure is applied to the back side of the fan 14. Since the space between the fan 14 and the motor base 20 communicates with the drain pipe 28, the discharge pipe 32, and the collection container 34, the inside of these parts is also pressurized. At this time, since the space between the rotary shaft 17 and the central drain block 26 of the fan 14 is sealed by the seal member 24, the space portion on the back side of the fan 14, the drain pipe 28, the discharge pipe 32, and the recovery pipe. The inside of the container 34 is highly airtight. Further, since the cooling zone Z3 has a low ambient temperature, the viscosity of the flux increases as compared with the other preheating zones Z1 and Z2. Therefore, the flow of pressure (gas) is stagnated, and the flux flow is hindered.

  In the present invention, the collection container 34 and the suction part S1 of the cooling zone Z3 are connected by the connecting tube 44. Therefore, since the pressure on the collection container 34 side is reduced, the flux is sucked, so that the flux accumulated on the motor base 20 is accommodated in the collection container 34.

  As described above, according to the first embodiment, the pressure on the collection container 34 side is reduced by connecting the collection container 34 and the suction part S1 of the cooling zone Z3 by the connecting tube 44. Therefore, the stagnation of the flux on the inclined surface 21 can be prevented. As a result, it is possible to avoid re-evaporation of the stagnant flux on the motor base 20 and contamination and sag due to the stagnant flux, so that the maintenance time of the reflow device 100A can be shortened.

  Here, a reflow apparatus has been proposed in which a drain pipe is externally attached to the outside rather than the inside of the discharge pipe, and the above-described collection container is attached in an oblique direction rather than a vertical direction. However, this reflow apparatus has a problem that the flux flowing from the drain portion enters and adheres to the gap between the drain pipe and the discharge pipe. Furthermore, since the attachment angle of the collection container is oblique, there is a problem that the amount of flux contained is small.

  On the other hand, according to the reflow apparatus 100A of the present invention, by extending the collection container 34 side of the discharge pipe 32 in the vertical direction, the attachment angle of the collection container 34 attached to the discharge pipe 32 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.

  Further, since the insertion portion 28c is provided in the drain pipe 28, and the insertion portion 28c is inserted into the inside of the discharge pipe 32 so as to enter deeper than the upper end inlet of the discharge pipe 32, the outer peripheral surface of the drain pipe 28 and the discharge pipe 32 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 28 and the discharge pipe 32 can be prevented. Further, even when the flux is fixed, the flux is fixed inside the drain pipe 28, so that the discharge pipe 32 attached to the outside of the drain pipe 28 can be easily detached from the drain pipe 28. As a result, the burden of maintenance work can be reduced and the maintenance work time can be shortened.

<2. Second Embodiment>
The second embodiment is different from the first 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 device 100B and the flux recovery device 80B are the same as those of the reflow device 100A and the flux recovery device 80A described in the first embodiment. The detailed description is abbreviate | omitted.

[Configuration example of decompression section]
FIG. 9 shows an example of the configuration of the flux recovery apparatus 80B in the cooling zone Z3 of the reflow apparatus 100B in which the decompression unit 40B having the ejector 50 is employed. As shown in FIG. 9, the decompression unit 40 </ b> B includes an ejector 50, an ejector side connection unit 58, a container side connection unit 42, and a connection tube 44. 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. 10 shows an example of a cross-sectional configuration of the ejector 50. Inside 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 device main body 10 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.

  As shown in FIGS. 9 and 10, one end of a connection tube 44 is connected to the suction port 50 e of the ejector 50 via an ejector side connection portion 58. A container-side connecting portion 42 is connected to the other end of the connecting tube 44. Thereby, the inside of the collection container 34 and the inside of the suction part S1 of the cooling zone Z3 are communicated with each other via the connection tube 44. 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. An outlet 50d of the ejector 50 is connected to the side wall portion 10c of the cooling zone Z3 of the reflow apparatus main body 10.

[Operation example of reflow device]
Next, an example of the operation of the reflow device 100B using the decompression unit 40B will be described. When nitrogen generated by the nitrogen generator is supplied to the ejector 50 through the nitrogen supply tube 56, the supplied nitrogen passes through the nitrogen supply path 50 a inside the ejector 50. At this time, nitrogen becomes a high-flow jet stream due to the recess 50f provided in the middle of the nitrogen supply path 50a, and the pressure decreases instead of increasing the stream. That is, the suction path 50b becomes a negative pressure due to the pressure loss. As a result, the pressure (gas) on the collection container 34 side is drawn into the suction path 50b of the ejector 50 via the connecting tube 44, 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 S1 of the cooling zone Z3. As described above, in the second embodiment, the inside of the collection container 34 is decompressed using the negative pressure generated when nitrogen is injected, and the flux is forcibly sucked into the collection container 34.

  As described above, the pressure equalization method according to the second embodiment is a pressure obtained by directly connecting the recovery container 34 and the cooling zone Z3 using the connection tube 44 described in the first 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 21 of the motor base 20 is caused to flow to the drain portion 22 with a larger drawing force (negative pressure) by nitrogen injection, and the flux is collected in the collection container 34. Can be forcibly aspirated. As a result, stagnation of the flux on the inclined surface 21 can be prevented, so that re-evaporation of the flux stagnating on the motor base 20, dirt and dripping due to the stagnant flux can be avoided, and maintenance of the reflow apparatus 100B. Time can be shortened.

<3. Third Embodiment>
The third embodiment is different from the first embodiment in that the drain part 22 is formed not at the central part of the motor base 20 but at two places on the peripheral part of the motor base 20. The other components such as the reflow device 100C are the same as those of the reflow device 100A described in the first embodiment. Therefore, common components are denoted by the same reference numerals, and detailed description thereof will be omitted. Omitted.

  11 and 12 show an example of the configuration of the flux recovery apparatus 80C. As shown in FIGS. 11 and 12, the flux recovery apparatus 80C includes a motor base 20, a drain part 22, a discharge pipe 32, a recovery container 34, and a decompression part 40C.

  The drain part 22 has a drain pipe 22a, a flange part 22b, and an insertion part 22e. The drain pipe 22 a is formed so as to penetrate the motor base 20 obliquely outward and downward from the peripheral edge portion of the upper surface of the motor base 20. In this example, the drain part 22 is provided in two places, and the upper end opening of these drain parts 22 and 22 is formed in the position where the peripheral part of the motor base 20 mutually opposes. The upper surface portion of the motor base 20 is an inclined surface 20 a that is inclined from the center portion of the motor base 20 toward the drain portion 22 formed outward. As a result, the liquefied flux flows outward along the inclined surface 20a, flows into the drain portion 22, and is discharged to a recovery container 34 described later.

  The insertion portion 22e is provided at the distal end portion of the drain pipe 22a, and the outer diameter D1 is selected to be equal to or smaller than the inner diameter D2 of the discharge pipe 32, so that the insertion section 22e can be inserted / removed (engaged) inside the discharge pipe 32. Yes. The flange portion 22 b is provided at the proximal end of the insertion portion 22 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 32 are formed at the four corners of the flange portion 22b.

  The discharge pipe 32 includes a flange portion 32 a, a discharge pipe main body 32 b, and a lid portion 33. The upper end side of the discharge pipe main body 32b extends obliquely downward along the extending direction of the drain pipe 22a, and is bent in the vertical direction slightly above the intermediate part and extends downward by a predetermined length. ing. The flange portion 32 a is provided at an end portion on the drain portion 22 side of the discharge pipe main body 32 b 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 portion 22 are formed in the four corner portions of the flange portion 32a.

  The lid portion 33 functions as a lid for a collection container 34 to be described later, and is attached to the lower end portion of the discharge pipe main body 32b. The lid portion 33 includes a top surface portion 33a having a diameter substantially the same as the outer diameter of the collection container 34, and a side wall portion 33b formed at the periphery of the top surface portion 33a. A screw groove corresponding to the screw groove of the collection container 34 is formed on the inner peripheral surface of the side wall 33b (not shown). Further, on the inner surface side of the top surface portion 33a, a cylindrical shape for preventing the flux flowing from the drain portion 22 into the collection container 34 from adhering to the inner peripheral surface of the top surface portion 33a, the thread groove of the side wall portion 33b, or the like. 33d is provided.

  The collection container 34 is detachably attached to the lid portion 33 and accommodates the flux that flows in via the drain portion 22 and the discharge pipe 32. 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 40 </ b> C is installed in each of the two collection containers 34 provided on both sides of the motor 16. The decompression unit 40 </ b> C includes a container side connection part 42, a connection tube 44, and a main body side connection part 46. The container-side connecting portion 42 is attached to a position that does not overlap the discharge pipe 32 on the outer surface of the top surface portion 33 a of the lid portion 33, and communicates with the inside of the collection container 34 via the lid portion 33. The main body side connecting portion 46 is attached to the side wall portion 10c constituting the cooling zone Z3 of the reflow apparatus main body 10, and communicates with the suction portion S1 of the cooling zone Z3 (see FIG. 2). One end of the connecting tube 44 is connected to the container side connecting portion 42, and the other end is connected to the main body side connecting portion 46.

  As described above, according to the third embodiment, even when the drain part 22 is formed on the peripheral part of the motor base 20, the pressure on the collection container 34 side is reduced by the pressure reducing part 40C provided in each. can do. Thereby, since the flow of the gas which goes to the drain part 22 arises also on the inclined surface 20a of the motor base 20, the stagnation of the flux on the inclined surface 20a can be prevented. As a result, re-evaporation of the flux stagnating on the motor base 20, contamination and dripping due to the stagnating flux can be avoided, and the flux can be efficiently allowed to flow into the recovery container 34. The maintenance time of the apparatus 100C can be shortened.

  It should be noted that the technical scope of the present invention is not limited to the above-described embodiments, and includes those in which various modifications are made to the above-described embodiments without departing from the spirit of the present invention. In the first to third embodiments described above, the other end of the connection tube 44 is connected to the suction part S1 of the cooling zone Z3. However, the present invention is not limited to this. For example, a suction device that generates a negative pressure may be provided in the reflow device 100, and the other end of the connection tube 44 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. According to this, the flux on the base member can flow into the collection container 34 more efficiently. Further, if there is a space in the reflow device 100 that generates negative pressure other than the suction part S1 of the cooling zone Z3 described above, the other end of the connection tube 44 can be connected to the space.

  In the first to third embodiments described above, the case where the pressure reducing units 40A, 40B, and 40C are installed in the cooling zone Z3 has been described in detail, but the pressure is also reduced in each of the preheating zone Z1 and the heating zone Z2. The sections 40A, 40B, and 40C can be applied. Thereby, also in the preheating zone Z1 and the heating zone Z2, accumulation of the flux on the motor base 20 can be suppressed effectively.

DESCRIPTION OF SYMBOLS 10 ... Reflow apparatus main body, 12 ... Heater, 14 ... Fan, 16 ... Motor, 20 ... Motor base (base member), 22 ... Drain part, 28 ... Drain pipe , 30A, 30C ... flux collecting section, 32 ... discharge pipe, 34 ... collection container (flux collecting section), 40A, 40B, 40C ... decompression section, 50 ... ejector (decompression section) ), 80A, 80B, 80C ... Flux recovery device, 100A, 100B, 100C ... Reflow device, S1 ... Suction unit, S2 ... Blowing unit, Z1 ... Preheating zone, Z2 ...・ Heating zone, Z3 ... Cooling zone

Claims (3)

A reflow device comprising a flux recovery device for recovering flux generated by a reflow process of a reflow device main body having a drive unit and a fan connected to the drive unit via a rotating shaft,
The flux recovery device is
A base member attached to the reflow device body;
A drain portion that is provided on the side of the base member facing the fan and in the peripheral portion of the rotating shaft, and that allows the flux generated by the reflow process to flow in and to be discharged to the outside;
A flux recovery part for recovering the flux through the drain part;
A reflow apparatus comprising: a decompression unit that decompresses the inside of the flux collection unit. The reflow device body has a preheating zone, a heating zone and a cooling zone,
Each of the preheating zone, the heating zone, and the cooling zone is provided with a suction portion that sucks the gas and a blowout portion that blows out the gas as the fan is driven,
The said one end of the said pressure reduction part is connected to the said flux collection | recovery part, The said other end of the said pressure reduction part is connected to either of the said suction parts of the said reflow apparatus main body. Reflow device. The reflow device main body is connected to a nitrogen injection part for supplying nitrogen into the reflow device main body through an ejector,
The ejector has a nitrogen inlet, a nitrogen output port, and a lead-in port for drawing gas with the nitrogen injection,
3. The reflow apparatus according to claim 1, wherein one end of the decompression unit is connected to the flux recovery unit, and the other end is connected to the drawing port of the ejector.

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