JP2008246514A - Flux collecting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flux collecting apparatus capable of improving a heat exchange rate as well as a flux recovery rate. <P>SOLUTION: The flux collecting apparatus 1 comprises: a main body 10 in which a hot air containing vaporizing substance flows through inside; an introducing pipe 26 which is mounted on this main body 10 and which introduces the hot air into the main body 10; a projecting member 17 which, mounted on the inner face of the main body 10, projects roughly orthogonally to the flowing direction of the hot air and which is collided with the hot air containing the vaporizing substance, cooled by heat exchange and deposited with the cooled flux component; and a hot air exhaust pipe which, mounted on the main body 10, exhausts the hot air coming via the projecting member 17 out of the main body 10. Such flux collecting apparatus 1 is provided for a heating blower 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a flux recovery device, and more specifically, in a heating device that is soldered to an electrode such as a printed circuit board, the vaporized material generated during heating is heat-exchanged and cooled, and the flux component in the vaporized material is recovered. The present invention relates to a flux recovery apparatus.

In recent years, with the miniaturization of electronic equipment and miniaturization of electrical wiring and electrode terminals on semiconductor substrates and printed circuit boards accompanying the downsizing and enhancement of functionality, and a new solder alloy that does not contain lead due to demand for environmentally friendly products The need for forming a solder layer is increasing.
In order to perform electrical wiring on a printed circuit board or the like, it is necessary to be soldered to an electrode such as a board. Therefore, in the heating device, a solder composition is placed on the board and hot air is jetted. A reflow process is performed in which the solder in the solder composition is melted and adhered to the electrodes of the substrate.

However, during the reflow process, a part of the solder composition and the organic solvent are vaporized by heating, and a situation occurs in which the mist-like flux fume floats in the heating device.
This flux fume is likely to adhere to a part having a low temperature. When the flux fume adheres, it drops from the adhering site and may adhere to the upper surface of the substrate, thereby impairing the performance of the substrate. In addition, the influence on the reflow process is increased, for example, the temperature partially decreases.
Therefore, how to remove the flux fume is a big problem.

2. Description of the Related Art Conventionally, a reflow soldering apparatus that has a hot air circulation type heating mechanism and removes and collects flux using a heat exchanger in a heating furnace that melts and joins solder is known (see Patent Document 1).
As shown in FIG. 16, the reflow soldering apparatus 100 disclosed in Patent Document 1 includes a radiator 102 having a plurality of cooling plates 101. The radiator 102 takes in external air from the blower 103 and blows it from the nozzle 104 to the cooling plate 101 to cool the cooling plate 101. And the cooling plate 101 and the air to blow are parallel. Further, a flux collecting device 105 that collects the flux F adhering to the cooling plate 101 is provided below the cooling plate 101 on the opposite side of the blower 103.

Further, a reflow furnace provided with a flux recovery device 110 as shown in FIG. 17 is known (see, for example, Patent Document 2). The flux recovery apparatus 110 of the reflow furnace includes a forward path 114 and a return path 115 that guide the atmospheric gas 111 that connects the hot air circulation heating mechanism and the flux recovery apparatus 110 provided with a cooling heat sink.
In the flux recovery apparatus 110 disclosed in Patent Document 2, the atmospheric gas 111 is heated between the outside air and the boundary between the forward path 114 through which the atmospheric gas 111 is guided and the return path 115 where the atmospheric gas is returned to the heating unit. A first heat sink 116 is disposed as a heat exchanger that exchanges and liquefies the flux component F. The first heat sink 116 is composed of a large number of metal fins 117 and is arranged in parallel with the direction of the atmospheric gas flow. In addition, a second heat exchanger 119 is disposed across the forward path 114 and the return path 115, and fins 120 are provided in the second heat exchanger 119. Furthermore, a tank 118 for storing the liquefied flux component is provided below the first heat sink 116.

Japanese Patent No. 3250079 JP 2003-324272 A

  However, in the reflow soldering apparatus 100 disclosed in Patent Document 1, air taken from outside is blown onto the cooling plate 101 via the nozzle 104 to cool the cooling plate 101, but the external air is cooled. It is sprayed in parallel along the plate 101. In addition, half of the cooling plate 101 in the width direction is arranged outside the gas chamber, and the heat cooled there is transferred to the remaining half on the gas chamber side, and is liquefied at the remaining half. Therefore, flux recovery is performed only on the surface of the cooling plate 101 on the gas chamber side, and since there is a large amount of nitrogen gas containing gaseous flux that does not contact the surface of the cooling plate 101, the heat exchange rate is poor, that is, the flux recovery rate is low. There is a problem of being bad.

  Further, in the reflow soldering apparatus 100 disclosed in Patent Document 1, half of the cooling plate 101 in the width direction is arranged on the gas chamber side, and this portion is cooled, which causes a temperature drop in the gas chamber. End up. As a result, it becomes difficult to adjust the temperature in the gas chamber, and extra power is consumed for reheating. Furthermore, it is difficult to remove the solid matter of the flux stuck to the cooling plate 101. If the solid matter cannot be removed, the cooling efficiency further deteriorates, and there is a problem that stable flux recovery cannot be performed for these reasons.

In the reflow furnace disclosed in Patent Document 2, the metal fins 117 of the heat exchanger provided in the recovery device 110 are arranged in parallel to the path of the atmospheric gas. Therefore, the reflow solder disclosed in Patent Document 1 is used. For the same reason as the problem in the attaching device 100, there is a problem that the cooling efficiency is never high, that is, the flux recovery rate is poor.
In addition, a second heat exchanger 119 is disposed across the forward path 114 and the return path 115 through which the atmospheric gas 111 passes, and the cooled atmospheric gas 111 that returns to the heating mechanism is warmed in advance by the second heat exchanger 119. Although the atmospheric gas cooled to such an extent that the flux component is liquefied in the cooling section comes into contact with one fin 120 of the second heat exchanger 119, the fin protruding into the forward path 114 120 is also cooled. Therefore, the ability to sufficiently heat the atmospheric gas 111 in the return path 115 cannot be expected. On the other hand, in order to heat the gas 111 in the return path 115, it is necessary to suppress the cooling in the flux recovery section, which may impair the original flux recovery capability.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a flux recovery apparatus that solves the above-described problems, improves the heat exchange rate, and improves the flux recovery rate.

  Another object of the present invention is to provide a flux recovery apparatus capable of preventing a decrease in the internal temperature of the heating apparatus in addition to the above object.

  The flux recovery device of the present invention is a flux recovery device that cools and recovers a vaporized substance containing a flux component heated and vaporized by hot air, and a main body part through which the hot air containing the vaporized substance flows, A hot air introduction portion mounted on the main body portion for introducing the hot air into the main body portion; a hot air introduction portion which is mounted on the inner surface of the main body portion and protrudes in a direction substantially orthogonal to the flow direction of the hot air; A projecting member on which the cooled flux component adheres, and a hot air discharging unit that is attached to the main body unit and exhausts the hot air that has passed through the projecting member from the main body unit. (Claim 1).

  According to the present invention, since the hot air containing the vaporized substance introduced from the hot air introducing portion collides with the protruding member from a direction substantially orthogonal to the protruding member, almost all of the collision is heat-exchanged and cooled. As a result, the heat exchange rate can be improved, and the flux recovery rate can be improved.

  In the present invention described above, the direction substantially orthogonal to the flow direction is a concept including a slight inclination, and when the inclination is applied, it is preferable that the inclination is such that the downstream side of the flow becomes lower.

  In the present invention, the medium is heated toward the object to be transported and sprayed as hot air so that the solder composition on the object to be heated is melted and soldered, and the hot air after soldering is recovered. It is equipped with a hot air circulation type heating blower, and the hot air introduction part may be connected to the high pressure part of the heating blower, and the hot air discharge part may be connected to the low pressure part of the heating blower.

  According to this invention, the heating blower is a hot air circulation type, and the flux recovery device is equipped with the hot air introduction part connected to the high pressure part of the heating blower and the hot air discharge part connected to the low pressure part. Even if heat is exchanged in the flux recovery device and the temperature of the hot air is lowered, the hot air discharged from the flux recovery device is sent to the low pressure portion and circulated to the high pressure portion while being heated from there. Since the temperature in the low-pressure part is relatively low, even if hot air of a relatively low temperature discharged from the flux recovery device is mixed there, it is recovered from the high-pressure part while being heated from there. A decrease can be prevented.

  Further, in the present invention, a plurality of the protruding members are arranged at a predetermined interval along the flow direction of the hot air, and each protruding member is formed in a shape that can be sequentially passed while preventing the flow of the hot air. (Claim 3).

  According to the present invention, since the hot air containing the vaporized substance introduced from the hot air introducing portion repeatedly collides with the plurality of protruding members, the heat component is efficiently exchanged and the flux component reliably contained in the vaporized substance. Can be liquefied and recovered.

  Further, in the present invention, the plurality of projecting members are constituted by a first member and a second member having different planar shapes, respectively, and the first member and the second member are arranged along the flow direction of the hot air. May be arranged alternately (claim 4).

  According to the present invention, the hot air containing the vaporized substance introduced from the hot air introducing section repeatedly collides with the first member and the second member having different shapes, so that the heat exchange is performed efficiently and reliably. It becomes possible to liquefy and collect the flux component contained in the vaporized substance.

  Further, in the present invention, the first member is disposed at an initial position on the hot air introducing portion side, and the shape of the first member is a shape having a hot air receiving surface wider than an opening portion of the hot air introducing portion. The shape of the two members may be a shape that has a notch portion that is opposed to the hot air receiving surface of the first member and has a projection area narrower than the hot air receiving surface.

According to the present invention, since the first member arranged at the first position on the hot air introduction part side has a hot air receiving surface wider than the opening of the hot air introduction part, the hot air containing the vaporized substance introduced from the hot air introduction part Almost everything collides with the first member.
Thereafter, the vaporized material that has passed through the first member flows to the second member, but the second member has a notch portion with a projected area smaller than that of the first member, so the vaporized material that has flowed from the first member. Almost all of the hot air containing is collected. As a result, heat exchange is performed efficiently, and the flux component contained in the vaporized substance can be liquefied and recovered reliably.

  Further, in the present invention, a cooling mechanism for supplying a cooling member that forms the insides of the first member and the second member in the hollow portion and cools the surfaces of the first member and the second member from the inner surface of the hollow portion. A drainage channel that discharges the cooling member discharged from the hollow portion to the outside may be formed on the side plate of the main body portion to which the first member and the second member are attached (Claim 6).

  According to this invention, since the first member and the second member are cooled by the cooling members supplied from the cooling mechanism, the vaporized substance introduced into the main body is more efficiently heat-exchanged. As a result, it is possible to liquefy and recover the flux component contained in the vaporized material.

  In the present invention, the cooling member is cooling water, and the cooling mechanism is constituted by a cooling water supply pipe for supplying the cooling water, and the cooling water supply pipe is connected to the first member or the second member. A pipe main body portion inserted into the drainage channel of the member, and a supply portion connected to the pipe main body portion and inserted into the hollow portion of the first member or the second member. At least one cooling water jet may be formed.

According to the present invention, the first member is cooled by the cooling water supplied from the cooling water supply pipe in the cavity, and the second member is supplied from the cooling water supply pipe in the cavity. Since it cools with a cooling water, the vaporized substance which collided with each member is cooled efficiently. As a result, heat exchange can be performed efficiently, and the flux component contained in the vaporized substance can be liquefied and recovered reliably.
Further, since the cooling water supply pipe can be attached to the first member or the second member, the apparatus can be made compact.

  Furthermore, in this invention, you may provide the flow volume adjustment means which adjusts the flow volume of the hot air introduce | transduced into the said main-body part in any one of the said hot-air introduction part and a hot-air discharge part.

  According to this invention, since the amount of vaporized substance introduced into the flux recovery device is adjusted by the flow rate adjusting means, a decrease in the temperature in the heating device expected when returning the hot air whose temperature has decreased into the heating device, or It is possible to reduce the amount of electricity used by the heater that reheats the lowered hot air.

  Further, in the present invention, the first member and the second member are made of metal, and the side plates to which the first member and the second member are attached are integrated via an insulating member, and the first member is integrated. And a second member may be provided with high voltage applying means for applying a high voltage to form a strong electric field in the hot air flow path of the main body (claim 9).

  According to the present invention, the first member and the second member are made of metal, the side plate to which the first member is attached is formed of the insulating member, and the side plate is connected to the side plate to which the second member is attached. In addition, a high voltage applying means for applying a high voltage to the first member and the second member is provided. Therefore, a high voltage is applied to the first member and the second member, and the first member and the second member are charged with a positive charge or a negative charge, respectively. Electrostatic adsorption. As a result, the trapping property of the flux component in the vaporized substance in the main body is improved, and the removal efficiency of the flux component can be improved.

  Further, in the present invention, the first member and the second member may be provided with their respective leading end portions inclined with respect to the base end portion with respect to the flow direction of hot air (claim 10).

  According to this invention, the heat-exchanged and liquefied flux component naturally falls along the slopes of the first member and the second member, and therefore does not adhere to the surfaces of the first member and the second member indefinitely. Recovery becomes easy.

  In the present invention, a drain pipe that collects the flux that collides with the first member and the second member and cools and adheres to the lower bottom plate of the main body and discharges it to the outside may be provided. ).

  According to this invention, since it becomes possible to discharge the liquefied flux component adhering to the first member and the second member by the drain pipe, the flux component does not accumulate in the flux recovery device, and as a result, The device can always be used in a normal state.

  Further, in the present invention, the main body is formed with first to fourth side plates, the first member is attached to the first side plate, and the first side plate is used as the second to fourth side plates. On the other hand, it may be provided so that it can be attached and detached.

  According to this invention, by removing the first side plate, it becomes possible to remove the flux component adhering to the surface of the first member and the second member of the flow path, and the reduction of the heat exchange rate accompanying the adhesion of the flux component; This makes it possible to prevent a decrease in flux recovery efficiency.

  Since this invention is comprised and functions as mentioned above, according to this, while aiming at the improvement of a heat exchange rate, improvement of a flux recovery rate can be aimed at and the fall of the internal temperature of a heating apparatus can be prevented.

  Hereinafter, one embodiment of a flux recovery device concerning the present invention is described based on Drawings 1-13.

  FIG. 1 shows a heating blower 2 equipped with the flux recovery apparatus 1. The heating blower 2 is heated together with another heating blower (not shown) to heat and melt the solder composition on the substrate W by soldering the medium toward the substrate W that is the object to be heated and spraying it as hot air. It constitutes the machine.

First, the outline of the heating fan 2 will be described with reference to FIG.
In FIG. 1, black arrows indicate the flow of hot air that is heated and jetted, and white arrows indicate the flow of hot air h that is collected after jetting.

The heating blower 2 reflows by heating air as a medium and spraying it as hot air H onto a substrate W such as a circuit board, and further recovering the hot air h after spraying and circulating the hot air. . The heating blower 2 includes a hot air generator main body 30, and a rectifying mechanism 32 that equalizes the hot air over the entire area of the hot air flow path 31 is disposed on the downstream side of the hot air generator main body 30. The rectifying mechanism 32 is constituted by a punching plate in which a large number of small holes are formed at equal intervals, for example.
The substrate W is transported by the transport means 50 in the direction orthogonal to the plane of the paper, as indicated by reference numeral S in FIG. However, this transport direction does not have to be a direction perpendicular to the plane of the paper, and in FIG. 1, for example, the transport direction may be transported from left to right or from right to left.

  Further, in the hot air generator main body 30, a hot air injection unit 33 that injects hot air onto the substrate W is provided on the downstream side of the rectifying mechanism 32. The hot air injection unit 33 is formed of the punching plate and is attached to the bottom of the hot air generator main body 30, and a large number of small holes formed in the punching plate form hot air injection ports 33A for injecting hot air H. .

  The relatively low temperature hot air h, which is ejected from the hot air ejection port 33A of the hot air ejection unit 33 and recovered after heating the substrate W, is sent to the blower 40 side by the intake air mechanism 34, and further from the casing 42 of the blower 40. The hot air generator body 30 is sent to the hot air generator body 30, whereby the hot air H and h are circulated in the heating fan 2.

  The intake air mechanism 34 has a recovery guide portion 35A that serves as a guide when recovering the relatively low temperature hot air h, and this recovery guide portion 35A is the lower end of the outer peripheral member 35 that forms the outer periphery of the main body of the heating blower 2. And is parallel to the hot air jet unit 33.

  The intake / air supply mechanism 34 includes a recovery passage 36 that sucks and recovers the hot air h. The recovery passage 36 is formed between the outer peripheral side portion of the hot air injection unit 33 and the outer peripheral member 35, and communicates with an intake chamber 37 that is defined in the upper portion of the hot air generator main body 30. A suction port 41 of the blower 40 such as a sirocco fan is opened above the central portion of the intake chamber 37.

  A heat exchanger 38 for heating the relatively low temperature hot air h into high temperature hot air is disposed in the recovery passage 36. The heat exchanger 38 includes a plurality of heater elements 39. The recovery passage 36 has a negative pressure in the heating blower 2 and constitutes a low pressure portion.

The blower 40 is configured such that an impeller 43 provided inside a casing 42 is rotatably supported by a rotating shaft 44, and a motor 45 installed outside the casing 42 is connected to the rotating shaft 44. . An air supply chamber 46 provided around the impeller 43 is communicated with the hot air generator main body 30 through a plurality of air supply passages 47.
Further, the air supply chamber 46 is a high-pressure portion having the highest pressure in the heating blower 2.

  And here, the said suction passage mechanism 34 is comprised including the said collection | recovery channel | path 36, the intake chamber 37, the suction inlet 41, the air blower 40, the air supply chamber 46 grade | etc.,.

As shown in FIGS. 1 and 2, the flux recovery according to the present invention is provided between the air supply chamber 46 serving as the high-pressure portion and the recovery passage 36 serving as the low-pressure portion of the heating blower 2 configured as described above. Device 1 is equipped.
The flux recovery apparatus 1 heat-exchanges the vaporized material vaporized by heating in the heating blower 2, and liquefies and collects the flux components therein.
And as above-mentioned, after introducing the hot air H from the air supply chamber 46 of the heating air blower 2 and collect | recovering the flux components in the vaporized substance contained in the hot air H in the apparatus 1, the collection | recovery channel | path in the heating air blower 2 again Return to 36.

As shown in FIG. 3 as an overall exploded perspective view, the flux recovery apparatus 1 includes a main body 10 whose overall shape is formed in a box shape, for example, a rectangular tube shape.
The inside of the main body 10 is hermetically sealed, and a vaporized substance cooling and recovery mechanism 16 is provided therein. The vaporized substance cooling / recovery mechanism 16 cools the flux component in the vaporized substance contained in the hot air H introduced into the main body 10 and can recover it by liquefying or solidifying it.
In FIG. 3, the top plate 25 and the bottom plate 27 constituting the main body 10 are omitted.

The main body 10 is formed by combining four side plates, that is, a first side plate 11, a second side plate 12, a third side plate 13, and a fourth side plate 14 in a cylindrical shape.
The first side plate 11 is made of, for example, a PI resin excellent in insulation and heat resistance, while the second to fourth side plates 12, 13, 14 are made of, for example, metal excellent in conductivity. . The second side plate 12 is provided at a distance from the side surface of the heating blower 2 so as not to be affected by the heat from the heating blower 2.
Furthermore, the upper end surfaces of the three side plates 11, 13, and 14 are closed by the top plate 25, and the lower ends are closed by the bottom plate 27 (see FIG. 2). Therefore, the inside of the main body 10 is in a sealed state.

The vaporized substance cooling / recovering mechanism 16 provided in the main body 10 includes a plurality of protruding members 17.
These protruding members 17 protrude in a direction substantially perpendicular to the flow direction of the hot air H, and are disposed at substantially equal intervals in the longitudinal direction of the main body 10. The projecting member 17 includes a first member 18 attached to the first side plate 11 and a second member 21 attached to the second to fourth side plates 12, 13, and 14.

  The first member 18 is made of metal having excellent conductivity, and, for example, four first members 18 are mounted in the main body portion 10 at a predetermined interval. Each of the first members 18 includes a single protruding portion 19 that protrudes toward the second member 21, and a single back plate portion 20 to which one end of each protruding portion 19 is fixed. Yes. And this back board part 20 is attached in the state covered on the surface of the 1st side board 11 which comprises the main-body part 10. As shown in FIG.

As shown in FIG. 5, the protrusion 19 is formed in a rectangular shape having a predetermined length K2 (see also FIG. 2) that is approximately half the width of the first side plate 11, and inhibits the flow of hot air. It has a shape. And in order to attach this protrusion part 19, 11 A of through-holes are made in the 1st side plate 11 in the thickness direction.
Here, since the four protrusions 19 of the first member 18 are provided as described above, the first side plate 11 has four through holes 11A corresponding to the four protrusions 19. It will be opened.

The back plate portion 20 is formed to have a width dimension that is a predetermined dimension wider than the width dimension of the protruding portion 19 and a length that is substantially the same as the length of the first side plate 11. Further, the back plate portion 20 is formed by a back plate main body 20A and a contact plate 20B provided on the back surface of the back plate main body 20A.
The back plate main body 20 </ b> A and the contact plate 20 </ b> B are provided separately so that a first cooling water supply pipe 22, which will be described later, as a cooling mechanism can be attached to the first member 18.

As shown in FIG. 8, the second member 21 is formed in a square U shape as a whole, and three outer peripheral portions are provided in contact with the inner surfaces of the second to fourth side plates 12, 13, and 14. Yes.
A notch portion 21A having a width dimension of K3 is formed at the center in the width direction of the second member 21, and both side portions 21B having a shape in which both sides of the notch portion 21A extend to the first member 18 side, The back side of the cutout portion 21A is a connecting portion 21C that connects the side portions 21B.
The width K3 of the notch 21A is smaller than the width K2 of the protrusion 19 of the first member 18 by a predetermined dimension. However, both width dimensions K2 and K3 may be the same. Further, the depth dimension from the opening side end portion of the notch portion 21 </ b> A to the connecting portion 21 </ b> C is shorter than the projecting dimension of the projecting portion 19 of the first member 18 by a predetermined dimension.
And the said width dimension K2 is a dimension larger than the diameter K1 of the opening 25A of the introduction pipe 26 which is a hot air introduction part.

  Three second members 21 configured as described above are arranged at predetermined intervals in the longitudinal direction of the main body 10, and these three second members 21 are the four projecting portions 19 of the first member 18. It is arranged between them. Therefore, the four protrusions 19 and the second member 21 of the first member 18 are alternately and orthogonally arranged with respect to the flow direction of the hot air.

As shown in FIGS. 4 and 5, the inside of the protruding portion 19 of the first member 18 is formed in a hollow portion 19 </ b> A, and this hollow portion 19 </ b> A is a cooling water discharge port 20 </ b> C formed in the contact plate 20 </ b> B of the back plate portion 20. It has come to communicate with. The cooling water discharge port 20 </ b> C communicates with a drainage channel 20 </ b> D formed in the back plate body 20 </ b> A of the back plate part 20.
The width dimension of the cooling water discharge port 20C is formed such that the pipe of one supply portion 22B of the first cooling water supply pipe 22 as a cooling structure described below is inserted with a margin, and the drainage channel 20D. Is formed in a larger width dimension than the cooling water discharge port 20C.

  The supply portion 22B of the first cooling water supply pipe 22 is inserted into the hollow portion 19A of the protruding portion 19 of the first member 18. As shown in detail in FIG. 12, the first cooling water supply pipe 22 has a pipe main body portion 22A and four supply portions 22B provided in the length direction of the pipe main body portion 22A. Has been. Each supply unit 22B is formed of one pipe.

  The first cooling water supply pipe 22 is formed of a PVC pipe or a metal pipe. Further, the tip of the supply part 22B of the first cooling water supply pipe 22 is closed by an end plate 23 as shown in FIG. 11, so that the supplied cooling water does not flow outside. Further, the end of the pipe body 22A is also closed with an end plate 23 as shown in FIG.

As shown in detail in FIG. 11, one cooling water outlet 22 </ b> C for ejecting cooling water is opened near each tip of the supply portion 22 </ b> B of the first cooling water supply pipe 22. The cooling water outlet 22C faces the inner surface of the upper surface forming the hollow portion 19A of the protruding portion 19 of the first member 18, and the cooling water M is jetted toward the inner surface.
And the surface of the said upper surface is a hot air receiving surface with which the circulating hot air collides substantially orthogonally. Therefore, since the hot air receiving surface with which hot air collides is directly cooled, heat exchange is performed efficiently and flux recovery is performed efficiently.

As shown in FIGS. 5-7, the said drainage channel 20D formed in the said backplate part 20 continues to the bottom part 20E of the backplate part 20, and the drain piping 20F is arrange | positioned at the bottom face.
Therefore, the cooling water M that has cooled the inside of each protruding portion 19 of the first member 18 is discharged from the cooling water discharge port 20C of each first member 18 to the drainage channel 20D, and then gathers at the bottom portion 20E. It is discharged to the outside through the pipe 20F.

As shown in FIG. 8, the inside of the second member 21 is formed in a hollow portion 21 </ b> D, and this hollow portion 21 </ b> D communicates with a cooling water discharge port 13 </ b> C formed in the contact plate 13 </ b> B of the third side plate 13.
The width dimension of the cooling water discharge port 13C is formed such that the pipes on both outer sides of the supply portion 24B in the second cooling water supply pipe 24 for the second member 21 can be inserted with a margin, and the cooling water discharge port 13C. Is communicated with a drainage channel 13D formed in the side plate body 13A.

As described above, the supply portion 24B of the second cooling water supply pipe 24 is inserted into the hollow portion 21D inside the second member 21. As shown in detail in FIG. 13, the cooling water supply pipe 24 includes a long pipe body 24A and three supply parts 24B provided in the middle of the pipe body 24A in the length direction. Is formed.
The supply unit 24B is formed in a bowl shape having three blades in plan view, and includes a central short part 24C, two long parts 24D on both sides longer than the short part 24C, and short parts thereof. It is formed of a connecting portion 24E that connects the size portion 24C and the long size portion 24D.
The two long portions 24 </ b> D correspond to both side portions 21 </ b> B of the second member 21, and the short portions 24 </ b> C correspond to the connecting portions 21 </ b> C of the second member 21.

  The second cooling water supply pipe 24 is also formed of a PVC pipe or a metal pipe. Further, the tip of the pipe main body 24A and the tips of the three portions of the supply part 24B are closed with an end plate 23 as shown in FIGS.

As shown in FIG. 11, one cooling water outlet 24 </ b> E that ejects the cooling water M that is a cooling member is opened near each of the three portions of the supply unit 24 </ b> B. This cooling water jet outlet 24E is directed to the inner surface of the upper surface forming the both side portions 21B of the second member 21 and the hollow portion 21D of the connecting portion 21C, and the cooling water M is jetted toward the inner surface. It has become.
And the surface of the said upper surface is a hot air receiving surface with which the circulating hot air collides substantially orthogonally. Therefore, since the hot air receiving surface with which hot air collides is directly cooled, heat exchange is performed efficiently and flux recovery is performed efficiently.

As shown in FIGS. 8 to 9, the drainage channel 13D formed in the side plate body 13A of the third side plate 13 continues to the bottom portion 13E of the side plate body 13A, and a drain pipe 13F (see FIG. 10) is provided on the bottom surface thereof. It is arranged.
Therefore, after the cooling water M that has cooled the inside of each second member 21 is discharged from the cooling water discharge port 13C formed in the contact plate 13A of the third side plate 13 to the drainage channel 13D formed in the side plate body 13A. , Collected at the bottom 13E, and discharged to the outside through the drain pipe 13F.

Returning to FIG. 2, one end of an introduction pipe 26, which is a hot air introduction part, is attached to the upper lid 25 constituting the main body 10 via a flange 26 </ b> A, and the other end of the introduction pipe 26 is connected to the heating blower 2. Is attached to a side wall 46A of an air supply chamber 46 which is a high-pressure part of the air supply via a flange 26A.
Therefore, the high-pressure hot air in the air supply chamber 46 is introduced from the introduction pipe 26 into the main body 10.

One end of a discharge pipe 28 that is a hot air discharge portion is attached to the bottom plate 27 that constitutes the main body portion 10 via a flange 28A. The other end of the discharge pipe 28 is attached to the side wall 35 </ b> A of the outer peripheral member 35 via the flange 27 </ b> A, so that the main body 10 communicates with a recovery passage 36 that is a low-pressure part of the heating blower 2.
Therefore, the hot air that has passed through the inside of the main body 10 is discharged from the discharge pipe 28 to the recovery passage 36.

  The introduction pipe 26 is provided with flow rate control means 4 for controlling the flow rate of hot air introduced into the main body 10. The flow rate control means 4 is configured by flow rate adjustment or the like, and can be controlled manually or automatically from the outside.

As shown in FIG. 4, the voltage applying means 5 is connected to the first member 18 and the second member 21 that constitute the protruding member 17 of the vaporized substance cooling and recovery mechanism 16. This voltage application means 5 is a device in which a strong electric field is provided in the flow path in the main body 10 of the flux recovery apparatus 1. Then, by providing this strong electric field, the first member 18 and the second member 21 of the projecting member 17 are charged with a positive charge or a negative charge, respectively. The flux component in the vaporized substance is electrostatically adsorbed to the two members 21 and removed as a liquid or solid flux component.
As a result, the cooled and liquefied material is adhered and separated and removed, and is also removed by electrostatic adsorption, so that the flux can be removed more efficiently.

  Next, the operation of the flux recovery apparatus 1 configured as described above will be described.

When, for example, a reflow process is performed by the heated air blower 2, hot air H is jetted onto the substrate W sent by the conveying means 50, whereby the solder composition is melted and soldered to the electrodes of the substrate W. The
The hot air h having a relatively low temperature after being jetted toward the substrate W is recovered in the recovery passage 36, and the temperature thereof is increased by the heat exchanger 38 and is sent to the air supply chamber 46 side.
A part of the hot air in the air supply chamber 46 is introduced into the main body 10 of the recovery device 1 from the introduction pipe 25 of the flux recovery device 1 provided over the air supply chamber 46 and the recovery passage 36.

The hot air introduced from the introduction pipe 25 collides with the surface of the protruding portion 19 of the first member 18 from the orthogonal direction, and then flows toward the second member 21 so as to wrap around from the periphery of the protruding portion 19. It flows and collides with both side portions 21B and the connecting portion 21C of the member 21.
The hot air H that has collided with both side portions 21B and the connecting portion 21C of the second member 21 is directed from the cutout portion 21A of the second member 21 toward the surface of the protruding portion 19 of the first member 18 that is disposed next. Flows in.

Hereinafter, similarly to the above, the hot air H sequentially flows through the main body portion 10 by repeatedly colliding with the first member 18 and the second member 21 and circulated air, and is returned from the discharge pipe 28 to the recovery passage 36. .
As described above, the hot air H is circulated among the recovery passage 36, the air supply chamber 46, and the flux recovery device 1.

When the hot air H circulates in the flux recovery apparatus 1, the first member 18 and the second member 21 are supplied with the cooling water M supplied from the cooling water supply pipes 22 and 23 inserted into the hollow portions 19A and 21D, respectively. It is always cooled by.
In particular, since the upper surface of the hollow portions 19A and 21D, that is, the hot air receiving surface on which the hot air H of the first member 18 and the second member 21 directly collides is cooled from the back surface, the cooling effect is improved. The flux component in the vaporized material is cooled and easily liquefied. As a result, the flux recovery efficiency is improved.

  As described above, since the first member 18 and the second member 21 are constantly cooled, the hot air H flowing in the flux collecting apparatus 1 is transferred from the first member 18 arranged at a predetermined interval to the second member 21. When the collisions occur sequentially, the flux components contained in the hot air H are cooled by the respective members 18 and 21 and are liquefied and attached.

  Further, the voltage application means 5 is connected to the first member 18 and the second member 21, and a strong electric field is provided in the flow path in the main body 10, so that a plurality of protruding members 17 are configured. The first member 18 and the second member 21 are charged with a positive charge or a negative charge, respectively. Therefore, the flux component contained in the hot air introduced from the introduction pipe 24 is electrostatically adsorbed by the first member 18 and the second member 21 and removed as a liquid or solid flux component.

According to the flux recovery apparatus 1 of the first embodiment as described above, the following effects are obtained.
(1) Since the hot air containing the vaporized substance introduced from the introduction pipe 26 collides with the projecting member 17 from a direction substantially orthogonal, almost all of the collision is heat-exchanged and cooled. As a result, the heat exchange rate can be improved, and the flux recovery rate can be improved.

(2) The heating blower 2 is of a hot air circulation type, and the introduction pipe 26 is connected to the high pressure portion of the heating blower 2, that is, the air supply chamber 46, and the discharge pipe 28 is connected to the low pressure portion, that is, the recovery passage 36. Since the heat recovery fan 1 is equipped with the flux recovery device 1, even if heat is exchanged in the flux recovery device 1 and the hot air temperature is lowered, the hot air H discharged from the flux recovery device 1 enters the recovery passage 36. It is sent to the air supply chamber 46 while being heated. Since the temperature in the recovery passage 36 is relatively low, even if hot air having a relatively low temperature discharged from the flux recovery device 1 is mixed therein, the recovery passage 36 is recovered in the supply chamber 46 while being heated from within the recovery passage 36. Therefore, it is not different from the normal circulation action, and this can prevent the internal temperature of the heating device 2 from being lowered.

(3) The protruding member 17 is composed of a plurality of first members 18 and second members 21, which are arranged at predetermined intervals along the flow direction of the hot air containing the vaporized substance, and have different shapes. Since the members 18 and 21 sequentially pass while obstructing the flow, the hot air introduced from the introduction pipe 26 sequentially collides, so that heat exchange is performed efficiently and surely in the vaporized substance. The flux component contained in is liquefied or solidified, and as a result, the flux can be easily recovered.

(4) The first member 18 is arranged at the first position on the introduction pipe 26 side, and the shape of the first member 18 has a hot air receiving surface having a width K2 wider than the opening width K1 of the introduction pipe 26. In addition, since the shape of the second member 21 is a shape facing the hot air receiving surface of the first member 18 and having a notch 21A having a projection area narrower than the hot air receiving surface, the introduction pipe Almost all of the hot air containing the vaporized material introduced from 26 collides with the first member 18.
Thereafter, the hot air that has passed through the first member 18 flows to the second member 21, but the second member 21 has a cutout portion 21 </ b> A having a projection area smaller than that of the first member 18. Almost all of the hot air containing the vaporized material that flowed from is collected.
As a result, heat exchange can be performed efficiently, and the flux component contained in the vaporized substance can be liquefied and recovered reliably.

(4) The first member 18 is cooled by the cooling water M supplied from the first cooling water supply pipe 22 in the hollow portion 19A, and the second member 21 has the second cooling water in the hollow portion 21D. Since it cools with the cooling water M supplied from the supply pipe 24, the vaporized substance which collided with each member 18 and 21 is cooled efficiently. As a result, heat exchange can be performed efficiently, and the flux component contained in the vaporized substance can be liquefied and recovered reliably.

(5) Since the first and second cooling water supply pipes 22 and 24 are attached to the first member 18 or the second member 21, it is not necessary to provide them outside, thereby making the apparatus compact. Can do.

(6) Since the flow rate adjusting means 4 for adjusting the flow rate of the hot air introduced into the main body 10 is provided in the introduction pipe 26, the hot air containing the vaporized material introduced into the flux recovery device 1 from the heating blower 2. The amount can be adjusted, and it is possible to suppress the decrease in the temperature in the heating device 2 expected when returning the hot air whose temperature has decreased into the heating device 2 or the amount of electricity used by the heater for reheating the decreased hot air. It becomes.

(7) The first member 18 and the second member 21 are made of metal, the first side plate 11 to which the first member 18 is attached is formed of an insulating member, and the first side plate 11 and the second member 21 are formed. Are connected to the second to fourth side plates 12, 13 and 14, and a high voltage applying means 5 for applying a high voltage to the first member 18 and the second member 21 is provided. Therefore, a high voltage is applied to the first member 18 and the second member 21, and the first member 18 and the second member 21 are charged with a positive charge or a negative charge, respectively, and these charges are vaporized substances. The flux component is electrostatically adsorbed. As a result, the collection property of the flux component in the vaporized substance in the main body 10 is improved, and the removal efficiency of the flux component can be improved.

(8) Since the drain pipe 29 is provided on the bottom plate 27 of the main body 10, the flux that collides with the first member 18 and the second member 21, cools and adheres naturally falls, and falls on the bottom of the main body 10. Even if they gather, they are discharged from the drain pipe 29 to the outside. As a result, the flux component does not accumulate in the flux recovery apparatus 1, and the apparatus can always be used in a normal state.

(9) The main body 10 is formed with first to fourth side plates 11 to 14, and the first side plate 11 can be attached to and detached from the other side plates 12 to 14. Since the first member 18 is attached to the first side plate 11, the flux component adhering to the surfaces of the first member 18 and the second member 21 can be easily removed by removing the first side plate 11. Become. As a result, by appropriately removing the first side plate 11 and removing the flux component, that is, cleaning, it is possible to prevent a decrease in the heat exchange rate accompanying the adhesion of the flux component and a decrease in the flux recovery efficiency due to this. It becomes.

  It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

For example, in the above-described embodiment, the first member 18 and the second member 21 are provided inside the main body 10 so as to protrude in a direction substantially orthogonal to the flow of the vaporized material flowing inside the main body 10. The attachment of the first member 18 and the second member 21 is not limited to this.
As shown in FIG. 14, the first member 18 and the second member 21 may be inclined and attached. In other words, in the flux recovery apparatus 1A, the distal end portions of the first member 18 and the second member 21 facing each other are downstream of the flow along the flow direction of the hot air with respect to the base end portions of the members 18 and 21. The side is mounted with an inclination which is lower, for example by α °. And this α ° is preferably set to 5 °, 10 °, or 5 ° to 10 °, for example.
Further, the bottom plate 27 is also inclined to one side, and a drain pipe 29 is provided at the tip corner of the inclination.
With this configuration, the heat-exchanged liquefied or solidified flux component naturally falls along the slopes of the first member and the second member, and adheres to the surfaces of the first member and the second member indefinitely. There is nothing to do. Since the flux component is finally collected on the inclined bottom plate 27 and discharged from the drain pipe 29, the flux can be easily collected.

Further, in the modification shown in FIG. 14, each of the first member 18 and the second member 21 has a distal end portion lower than a proximal end portion of each member 18, 21 on the downstream side in the hot air flow direction. However, the present invention is not limited to this. Both the first member 18 and the second member 21 may be inclined in the same direction, or may be inclined in the direction perpendicular to the paper surface of FIG.
In this case, if one or two small holes, for example, are formed on the base end side of each member 18, 21, the liquefied or solidified flux component falls from the small holes, so the flux regardless of the inclination direction. Can be easily recovered.
Furthermore, you may attach the main-body part 10 itself in the flux collection | recovery apparatus 1 of the said 1st Embodiment inclining with respect to the perpendicular direction.

  In the first embodiment, the flux recovery apparatus 1 is mounted on the supply chamber 46, which is a high-pressure part of one heating blower 2, and the recovery passage 36, which is a low-pressure part, but is not limited thereto. As shown in FIG. 15, the flux recovery apparatus 1 </ b> B may be bridged between the adjacent heating blowers 3 and 2 constituting the heater 8. In this case, what is necessary is just to span between the high voltage | pressure part of the high temperature heating fan 2, and the low voltage | pressure part of the low temperature heating fan 3. FIG.

  Moreover, in the said 1st Embodiment, although the flux collection | recovery apparatus 1 was provided with each cylindrical main body part 10, it is good not only as this but a round cylindrical main body part, for example. In this case, the attachment member for attaching the first member and the attachment member for attaching the second member may be made of metal and the attachment members may be insulated from each other.

  Furthermore, in the said embodiment, although the 1st member of the flux collection | recovery apparatus 1 was comprised with 4 sheets, and the 2nd member was comprised with 3 sheets, it is not restricted to this. Depending on the length of the part to be equipped, the first member may be 4 or more, or 4 or less, and the second member may be 3 or more, or 3 or less. In any case, the first member and the second member may be arranged alternately.

  INDUSTRIAL APPLICABILITY The present invention can be used for a heating device that is soldered to an electrode such as a printed circuit board.

1 is an overall schematic diagram showing a heating device equipped with the flux recovery device in an embodiment of a flux recovery device according to the present invention. It is a partial sectional side view which shows the flux collection | recovery apparatus of the said embodiment. It is a whole perspective view which shows the flux collection | recovery apparatus of the said embodiment. It is sectional drawing along the IV-IV line in FIG. It is sectional drawing along the VV line in FIG. It is sectional drawing along the VI-VI line in FIG. It is a figure of the partial cross section which shows the lower end by the side of the 1st member of the flux collection | recovery apparatus of the said embodiment. It is sectional drawing along the VIII-VIII line in FIG. It is sectional drawing along the IX-IX line in FIG. It is sectional drawing along the XX line in FIG. It is detail drawing of the partial cross section which shows the jet nozzle of the 1st, 2nd cooling water supply pipe in the flux collection | recovery apparatus of the said embodiment. It is a whole perspective view which shows the 1st cooling water supply pipe in the flux collection | recovery apparatus of the said embodiment. It is a whole perspective view which shows the 2nd cooling water supply pipe in the flux collection | recovery apparatus of the said embodiment. It is a longitudinal cross-sectional view which shows the deformation | transformation form of the flux collection | recovery apparatus of this invention. It is a general view which shows the example in which the flux collection | recovery apparatus of this invention was provided over the adjacent heating air blower. It is a figure which shows the reflow soldering apparatus provided with the conventional flux collection | recovery apparatus. It is a figure which shows the other conventional flux collection | recovery apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flux collection | recovery apparatus 2 Heating blower 4 Flow rate adjustment means 5 Voltage application means 10 Main-body part 11 1st side plate 13 3rd side plate 16 Vaporized substance cooling mechanism 17 Projection-shaped member 18 1st member 21 2nd member 22 1st which is a cooling mechanism Cooling water supply pipe 24 Second cooling water supply pipe that is a cooling mechanism 29 Drain pipe 36 Recovery passage that constitutes the low pressure portion 46 Air supply chamber that constitutes the high pressure portion

Claims (12)

A flux recovery device that cools and recovers a vaporized substance containing a flux component heated and vaporized by hot air,
A main body part through which the hot air containing the vaporized substance flows,
A hot air introduction part mounted on the main body part for introducing the hot air into the main body part;
A protrusion that is attached to the inner surface of the main body and protrudes in a direction substantially perpendicular to the flow direction of the hot air, and that the vaporized substance collides, is cooled by heat exchange, and the cooled flux component adheres. A member,
A flux collecting apparatus, comprising: a hot air discharger that is mounted on the main body and discharges the hot air from the main body via the protruding member. Hot air circulation type heating that heats and melts the solder composition on the heated object by heating the medium toward the heated object to be conveyed and spraying it as hot air, and collecting the hot air after soldering Equipped with a blower,
2. The flux recovery apparatus according to claim 1, wherein the hot air introduction part is connected to a high pressure part of the heating blower, and the hot air discharge part is connected to a low pressure part of the heating blower.   A plurality of the protruding members are arranged at predetermined intervals along the flow direction of the hot air, and each protruding member is formed in a shape that can be sequentially passed while preventing the flow of the hot air. Item 3. A flux recovery device according to item 1 or 2.   The plurality of projecting members are composed of a first member and a second member, each having a different planar shape, and the first member and the second member are alternately arranged along the flow direction of the hot air. The flux recovery apparatus according to any one of claims 1 to 3, wherein   The first member is arranged at the first position on the hot air introduction part side, the shape of the first member is a shape having a hot air receiving surface wider than the opening of the hot air introduction part, and the shape of the second member is The flux recovery apparatus according to claim 4, wherein the flux recovery device has a shape that has a notch portion that is opposed to the hot air receiving surface of the first member and has a projection area narrower than the hot air receiving surface.   The inside of the first member and the second member is respectively formed in the cavity, and a cooling mechanism for supplying a cooling member for cooling the surfaces of the first member and the second member from the inner surface of the cavity is made insertable, and The flux according to claim 4 or 5, wherein a drainage channel for discharging the cooling member discharged from the hollow portion to the outside is formed on a side plate of the main body portion to which the first member and the second member are attached. Recovery device.   The cooling member is used as cooling water, and the cooling mechanism is constituted by a cooling water supply pipe for supplying the cooling water, and the cooling water supply pipe is used as the drainage channel for the first member and the second member. A pipe main body part inserted into the pipe main body part and a supply part connected to the pipe main body part and inserted into the cavity of the first member or the second member. The flux recovery apparatus according to claim 6, wherein a water ejection port is formed.   The flow rate adjusting means for adjusting the flow rate of the hot air introduced into the main body is provided in either one of the hot air introduction part and the hot air discharge part. Flux collection device.   The first member and the second member are made of metal, and the side plates to which the first member and the second member are attached are integrated via an insulating member, and the first member and the second member are integrated. The flux recovery apparatus according to any one of claims 1 to 8, wherein a high voltage applying means for applying a high voltage is provided to form a strong electric field in the hot air flow path of the main body.   The said 1st member and the 2nd member are provided in any one of Claim 4 thru | or 10 in which each front-end | tip part which mutually opposed was inclined with respect to the distribution direction of a hot air with respect to a base end part. The flux collecting apparatus as described.   10. The drain pipe for collecting the flux that collides with the first member and the second member and is cooled and attached to the lower bottom plate of the main body and discharges it to the outside. The flux collection | recovery apparatus of any one.   The main body is formed with first to fourth side plates, the first member is attached to the first side plate, and the first side plate is attached to and removed from the second to fourth side plates. The flux recovery apparatus according to any one of claims 4 to 11, wherein the flux recovery apparatus is provided.

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