Flow dividing air duct structure for reflow soldering

Abstract

The invention discloses a flow dividing air duct structure for reflow soldering, and relates to the technical field of reflow soldering. The device comprises a rectification air bellow, a rectification air opening frame plate is fixedly installed in the rectification air bellow, a plurality of air inlet pipes are arranged on one side of the rectification air bellow, and a plurality of volute air pipes which are evenly distributed are fixedly installed in the rectification air opening frame plate; the air inlet ends of the multiple volute air pipes all extend out of the rectification air box and communicate with the multiple air inlet pipes correspondingly. By arranging the adjusting grating plate, the grating shafts can be driven by the micro control motor to drive the adjusting grating plate to precisely rotate in the air chamber, so that the air volume and the air direction of backflow air entering the air chamber are adjusted when the backflow air rushes out, each grating shaft is independently controlled, and the adjustment effect is good. Various air outlet modes such as uniform air outlet and local air outlet can be achieved, meanwhile, the air outlet amount of the air outlet can be obtained through calculation, quantification is achieved, backflow air is evenly distributed on a product, and the product is heated more evenly.

Description

Technical Field

[0001] The present invention relates to the technical field of reflow soldering, and in particular to a diversion air duct structure for reflow soldering. Background Art

[0002] With the continuous development of the SMT industry, the quality requirements for the soldering process are getting higher and higher. The reflow temperature zone used in the soldering operation has also evolved from the most traditional one temperature zone to the current common eight temperature zones, ten temperature zones, twelve temperature zones, and even more temperature zones. In the hot air circulation reflow in each temperature zone, the diversion air duct plays an important role in rectifying the reflow air, which directly affects the hot air volume and direction, and thus determines the heating uniformity of the product.

[0003] In the traditional reflow soldering air rectification design, a porous plate or mesh plate is generally added below the air outlet as a primary rectification plate to rectify and disperse the air entering the air outlet and then diffuse it into the entire box. However, the uniformity of the rectified air in this traditional reflow soldering diversion duct structure is unquantifiable, and it is difficult to adjust the uniformity of heating of the product after rectification. Therefore, a reflow soldering diversion duct structure is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that the uniformity of the wind after rectification is not quantifiable and it is difficult to adjust the uniformity of heating of the product after rectification in the traditional reflow soldering diversion duct structure. The present invention provides a diversion duct structure for reflow soldering.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A diverter air duct structure for reflow soldering comprises a rectifying air box, a rectifying air outlet frame is fixedly installed inside the rectifying air box, a plurality of air inlet pipes are arranged on one side of the rectifying air box, a plurality of evenly distributed volute air ducts are fixedly installed inside the rectifying air outlet frame, the air inlet ends of the plurality of volute air ducts extend to the outside of the rectifying air box and are respectively connected to the plurality of air inlet pipes, a plurality of evenly distributed heating rods are fixedly installed inside the rectifying air outlet frame, heating wires are wound around the heating rods, a plurality of first-level rectifier plates evenly distributed from top to bottom are fixedly installed inside the rectifying air outlet frame, the first-level rectifier plates are all horizontally arranged, and evenly distributed first-level rectifier air holes are opened on the first-level rectifier plates, and the first-level rectifier plates are all located between the volute air ducts and the heating rods.

[0007] Furthermore, a plurality of air chamber partitions evenly distributed from top to bottom are fixedly installed inside the rectifier air outlet frame plate, and the air chamber partitions are all located between the primary rectifier plate and the secondary rectifier plate, and the plurality of heating rods are evenly distributed between each of the air chamber partitions in equal proportions.

[0008] Furthermore, a plurality of evenly distributed grille shafts are rotatably installed inside the air chamber partitions, and an adjustment grille plate is fixedly installed on the grille shafts. A plurality of evenly distributed control compartments are opened in the inner wall of the rectifying air outlet frame plate, and a micro-control motor is fixedly installed inside the control compartments. The output shafts of the plurality of micro-control motors extend to the interior of the rectifying air outlet frame plate and are respectively driven and connected to the plurality of grille shafts.

[0009] Furthermore, a plurality of secondary rectifier plates evenly distributed from top to bottom are fixedly installed inside the end of the rectifier air outlet frame plate facing away from the volute air duct, the secondary rectifier plates are all horizontally arranged, and the secondary rectifier plates are all provided with evenly distributed secondary rectifier air holes, and the heating rods are all located between the primary rectifier plate and the secondary rectifier plate.

[0010] Furthermore, the total area of ​​the plurality of primary rectifier plates and the total area of ​​the plurality of secondary rectifier plates are both equal to the area of ​​the vertical cross section of the rectifier air outlet frame plate.

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. The present invention provides adjustable grille plates so that the grille shafts inside each air chamber are driven by a micro-control motor to rotate, thereby driving each adjustable grille plate to precisely rotate in the air chamber, thereby adjusting the volume and direction of the return air entering the air chamber when it gushes out. Each grille shaft is individually controlled, which can achieve various air outlet modes such as uniform air outlet and localized air outlet. At the same time, the air outlet volume can be calculated and quantified, so that the return air is evenly distributed on the product, allowing the product to be heated more evenly.

[0013] 2. The present invention provides a secondary rectifier plate. After being initially rectified by the primary rectifier plate and then heated by the heating rod and heating wire, the return air will contact the secondary rectifier plate when it flows out of the rectifier air outlet frame plate, and then be further finely diverted by the secondary rectifier air hole array evenly distributed on the secondary rectifier plate, thus achieving two-stage rectification. At the same time, the diversion air duct structure adopts a "circular inlet and square outlet" air outlet design, that is, the air inlet is circular and the air outlet is rectangular, which makes it easy to finely adjust the air volume and wind direction of the return air that is difficult to quantify when it is discharged;

[0014] 3. The present invention arranges air chamber partitions so that the internal space of the rectifier air outlet frame between the primary rectifier plate and the secondary rectifier plate is divided into air chambers of equal size. The air chambers do not interfere with each other. The heating rods and heating wires are in the air chambers to heat the return air that has been dispersed initially, effectively avoiding the upward surge of the air flow due to heat and causing a significant impact on the regulation of the output air volume and the control of the wind direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 This is a front view structural diagram of the rectifier bellows of the present invention;

[0017] Figure 3 This is a schematic diagram of the internal structure of the rectifier air box of the present invention;

[0018] Figure 4 This invention Figure 3 Schematic diagram of the structure at A in the middle;

[0019] Figure 5 This invention Figure 3 Schematic diagram of the cross-sectional structure at AA in the middle;

[0020] Figure 6 This invention Figure 5 Schematic diagram of the structure at B in the middle;

[0021] Figure numerals: 1. Rectification bellows; 2. Rectification air outlet frame; 3. Air inlet pipe; 4. Volute air duct; 5. Heating rod; 6. Heating wire; 7. Primary rectifier plate; 701. Primary rectifier air hole; 8. Secondary rectifier plate; 801. Secondary rectifier air hole; 9. Air chamber partition; 10. Grille shaft; 11. Adjustment grille plate. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0024] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, the terms "first," "second," etc. are used only to distinguish the descriptions and are not to be understood as indicating or implying relative importance.

[0025] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0026] like Figures 1 to 6 As shown, a reflow soldering split air duct structure includes a rectifying air box 1, as shown in FIG. Figure 1 、 Figure 2 As shown, specifically, a rectifying air outlet frame plate 2 is fixedly installed inside the rectifying air box 1, a plurality of air inlet pipes 3 are provided on one side of the rectifying air box 1, a plurality of evenly distributed volute air ducts 4 are fixedly installed inside the rectifying air outlet frame plate 2, and the air inlet ends of the plurality of volute air ducts 4 extend to the outside of the rectifying air box 1 and are respectively connected to the plurality of air inlet pipes 3, as shown in FIG. Figure 4 、 Figure 6 As shown, a plurality of evenly distributed heating rods 5 are fixedly installed inside the rectifier air outlet frame plate 2, and heating wires 6 are wound around the heating rods 5. A plurality of first-level rectifier plates 7 evenly distributed from top to bottom are fixedly installed inside the rectifier air outlet frame plate 2, and the first-level rectifier plates 7 are all horizontally arranged, and evenly distributed first-level rectifier air holes 701 are opened on the first-level rectifier plates 7. The first-level rectifier plates 7 are all located between the volute air duct 4 and the heating rods 5.

[0027] More specifically, when the diversion air duct structure of the reflow soldering rectifies the transport air of the reflow soldering, the reflow air in the reflow soldering will first be diverted to each air inlet pipe 3 through the main air duct for the first diversion, and then input into each volute air duct 4 through each air inlet pipe 3 for guidance. Thereafter, the diverted airflow will be transported to the rectifier air outlet frame plate 2 inside the rectifier air box 1, and then after contacting each first-level rectifier plate 7 respectively, it will be diverted again by the first-level rectifier air hole 701 array evenly distributed on the first-level rectifier plate 7, so that the wind is evenly diffused inside the entire rectifier air outlet frame plate 2, realizing the traditional rectifier and dispersion of the reflow air, and the rectified air will be evenly heated by each heating rod 5 and heating wire 6 and heated, thereby completing the circulation and heat replenishment of the reflow air.

[0028] like Figure 6 As shown, a plurality of air chamber partitions 9 evenly distributed from top to bottom are fixedly installed inside the rectifier air inlet frame plate 2. Specifically, the air chamber partitions 9 are all located between the primary rectifier plate 7 and the secondary rectifier plate 8, and a plurality of heating rods 5 are evenly distributed between each air chamber partition 9 in equal proportion.

[0029] In this embodiment, multiple air chamber partitions 9 divide the internal space between the primary rectifier plate 7 and the secondary rectifier plate 8 into air chambers of equal size. The heating rod 5 and the grille shaft 10 are both located inside each air chamber. The number of air inlet pipes 3 corresponds to the number of air chambers inside the rectifier air outlet frame 2. The air inlet ends of the air inlet pipes 3 are horizontally arranged and maintained at the same horizontal height. After bending, the air outlet ends are respectively connected to the various volute air ducts 4 on the back of the rectifier air box 1 to facilitate the installation of the blowing equipment and the adjustment of the rectifier wind direction.

[0030] More specifically, by setting the air chamber partition 9, the internal space of the rectifier air outlet frame 2 between the primary rectifier plate 7 and the secondary rectifier plate 8 is divided into air chambers of equal size. The air chambers do not interfere with each other. The heating rod 5 and the heating wire 6 are in the air chamber to heat the return air that is initially dispersed, effectively avoiding the air flow from surging due to heat and causing a significant impact on the adjustment of the output air volume and the control of the wind direction.

[0031] like Figure 4 、 Figure 6 As shown, specifically, a plurality of evenly distributed grille shafts 10 are rotatably installed inside the air chamber partition 9, and an adjustment grille plate 11 is fixedly installed on the grille shaft 10. A plurality of evenly distributed control compartments are opened in the inner wall of the rectifier air outlet frame 2, and a micro-control motor is fixedly installed inside the control compartment. The output shafts of the plurality of micro-control motors extend to the interior of the rectifier air outlet frame 2 and are respectively driven and connected to the plurality of grille shafts 10.

[0032] In this embodiment, the micro control motors are all micro servo motors to ensure the accuracy of the rotation control of the adjustment grid plate 11 , and the total area of ​​the adjustment grid plate 11 is close to the area of ​​the vertical cross section of the rectifier air outlet frame plate 2 .

[0033] More specifically, by setting an adjustable grille plate 11, the grille shaft 10 inside each air chamber will be driven by a micro-control motor to rotate, thereby driving each adjustable grille plate 11 to rotate precisely in the air chamber, thereby adjusting the air volume and wind direction of the return air entering the air chamber when it gushes out. Each grille shaft 10 is individually controlled, and can achieve various air outlet modes such as uniform air outlet and local air outlet. At the same time, the air outlet volume of the air outlet can be calculated and quantified, so that the return air is evenly distributed on the product, allowing the product to be heated more evenly.

[0034] like Figure 1 、 Figure 2 As shown, a plurality of secondary rectifier plates 8 evenly distributed from top to bottom are fixedly installed inside the end of the rectifier air inlet frame plate 2 facing away from the volute air duct 4. Specifically, the secondary rectifier plates 8 are all arranged horizontally, and evenly distributed secondary rectifier air holes 801 are opened on the secondary rectifier plates 8. The heating rods 5 are all located between the primary rectifier plate 7 and the secondary rectifier plate 8.

[0035] More specifically, by setting a secondary rectifier plate 8, the return air that is initially rectified by the primary rectifier plate 7 and then heated by the heating rod 5 and the heating wire 6 will contact the secondary rectifier plate 8 when it flows out of the rectifier air outlet frame plate 2, and then will be finely diverted again by the array of secondary rectifier air holes 801 evenly distributed on the secondary rectifier plate 8, thereby realizing two-stage rectification. At the same time, the diversion air duct structure adopts an "inlet round and outlet square" air outlet design, that is, the air inlet is circular and the air outlet is rectangular, so that the return air that is difficult to quantify can be finely adjusted in terms of air volume and wind direction when it is discharged.

[0036] like Figure 2 、 Figure 6 As shown, specifically, the total area of ​​the multiple primary rectifier plates 7 and the total area of ​​the multiple secondary rectifier plates 8 are both equal to the area of ​​the vertical cross section of the rectifier air outlet frame plate 2 .

[0037] More specifically, the area of ​​the rectifier air outlet frame plate 2 matches the total area of ​​the primary rectifier plate 7 and the secondary rectifier plate 8, which can prevent air leakage and ensure the accuracy of air volume regulation.

[0038] In summary: when the diversion air duct structure of the reflow soldering rectifies the transport air of the reflow soldering, the reflow air in the reflow soldering will first be diverted to each air inlet pipe 3 through the main air duct for the first diversion, and then input into each volute air duct 4 through each air inlet pipe 3 for diversion, and then the diverted air flow will be transported to the internal rectifier air outlet frame plate 2 of the rectifier air box 1, and then after contacting each primary rectifier plate 7 respectively, it will be diverted again by the primary rectifier air hole 701 array evenly distributed on the primary rectifier plate 7, so that the wind is evenly diffused inside the entire rectifier air outlet frame plate 2, realizing the traditional reflow soldering. The wind is rectified and dispersed, and the rectified wind will be evenly heated by each heating rod 5 and heating wire 6 to increase its temperature, thereby completing the circulation and heat replenishment of the return air. By setting a secondary rectifier plate 8, the return air that is initially rectified by the primary rectifier plate 7 and then heated by the heating rod 5 and heating wire 6 will contact the secondary rectifier plate 8 when it flows out of the rectifier air outlet frame plate 2, and then will be finely diverted again by the secondary rectifier air hole 801 array evenly distributed on the secondary rectifier plate 8, realizing two-stage rectification. At the same time, the diversion air duct structure adopts the "inlet round and outlet square" air outlet design, that is, the air inlet is circular and the air outlet is rectangular , which is convenient for making the return air that is difficult to quantify, and making fine adjustments to the air volume and wind direction when the air is discharged. The area of ​​the rectifier air outlet frame plate 2 matches the total area of ​​the primary rectifier plate 7 and the secondary rectifier plate 8, which can prevent air leakage and ensure the accuracy of air volume adjustment. By setting the air chamber partition 9, the internal space of the rectifier air outlet frame plate 2 between the primary rectifier plate 7 and the secondary rectifier plate 8 is divided into air chambers of equal size, and the air chambers do not interfere with each other. The heating rod 5 and the heating wire 6 are in the air chamber to heat the return air that is initially dispersed, effectively avoiding the air flow being heated and surging to the output The adjustment of air volume and control of wind direction have a significant impact. By setting the adjustment grille plate 11, the grille shaft 10 inside each air chamber will be driven by the micro-control motor to rotate, thereby driving each adjustment grille plate 11 to rotate precisely in the air chamber, thereby adjusting the air volume and wind direction of the return air entering the air chamber when it gushes out. Each grille shaft 10 is controlled separately, and various air outlet modes such as uniform air outlet and local air outlet can be achieved. At the same time, the air outlet volume of the air outlet can be calculated and quantified, so that the return air is evenly distributed on the product, allowing the product to be heated more evenly.

[0039] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A reflow soldering duct structure, characterized in that: The invention comprises a rectifying wind box (1), wherein a rectifying wind outlet frame plate (2) is fixedly installed inside the rectifying wind box (1), a plurality of air inlet pipes (3) are arranged on one side of the rectifying wind box (1), a plurality of evenly distributed volute air ducts (4) are fixedly installed inside the rectifying wind outlet frame plate (2), the air inlet ends of the plurality of volute air ducts (4) all extend to the outside of the rectifying wind box (1) and are respectively connected to the plurality of air inlet pipes (3), and the interior of the rectifying wind outlet frame plate (2) is fixedly installed with a plurality of air inlet pipes (3). A plurality of evenly distributed heating rods (5) are fixedly installed, and a heating wire (6) is wound around each of the heating rods (5). A plurality of evenly distributed first-level rectifier plates (7) are fixedly installed inside the rectifier air outlet frame plate (2), and the first-level rectifier plates (7) are evenly distributed from top to bottom. The first-level rectifier plates (7) are all arranged horizontally, and evenly distributed first-level rectifier air holes (701) are opened on each of the first-level rectifier plates (7). The first-level rectifier plates (7) are all located between the volute air duct (4) and the heating rods (5).

2. A reflow soldering air duct structure according to claim 1, characterized in that: A plurality of secondary rectifier plates (8) evenly distributed from top to bottom are fixedly installed inside the end of the rectifier air outlet frame plate (2) facing away from the volute air duct (4), the secondary rectifier plates (8) are all arranged horizontally, and the secondary rectifier plates (8) are all provided with evenly distributed secondary rectifier air holes (801), and the heating rods (5) are all located between the primary rectifier plate (7) and the secondary rectifier plate (8).

3. The reflow soldering duct structure according to claim 2, characterized in that: The total area of ​​the plurality of primary rectifier plates (7) and the total area of ​​the plurality of secondary rectifier plates (8) are both equal to the area of ​​the vertical cross section of the rectifier air inlet frame plate (2).

4. The reflow soldering duct structure according to claim 2, characterized in that: A plurality of air chamber partitions (9) evenly distributed from top to bottom are fixedly installed inside the rectifier air inlet frame plate (2), and the air chamber partitions (9) are all located between the primary rectifier plate (7) and the secondary rectifier plate (8), and a plurality of the heating rods (5) are evenly distributed between each of the air chamber partitions (9) in equal proportions.

5. The reflow soldering duct structure according to claim 4, characterized in that: A plurality of evenly distributed grille shafts (10) are rotatably mounted inside the air chamber partition (9), and an adjustment grille plate (11) is fixedly mounted on each of the grille shafts (10). A plurality of evenly distributed control compartments are opened in the inner wall of the rectifier air outlet frame (2), and a micro-control motor is fixedly mounted inside each of the control compartments. The output shafts of the plurality of micro-control motors extend into the interior of the rectifier air outlet frame (2) and are respectively connected to the plurality of grille shafts (10) for driving.

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