PCB drying device

Abstract

The utility model provides a kind of PCB drying device, it includes gas supply component, air jet component, support component and airflow regulating component, the air jet component includes air outlet plate, deflector and bottom plate sequentially arranged from top to bottom, the air outlet plate middle part is equipped with through-hole, the periphery of the through-hole is equipped with several air outlet holes, the edge of the air outlet plate is sealedly connected with the edge of the bottom plate, cavity is formed between the air outlet plate and the bottom plate, the deflector includes the cylinder portion of the through-hole edge of the air outlet plate sealedly connected and the deflection portion arranged in the cylinder portion lower end opening, the deflection portion is inverted horn shape, the lower end edge between the deflection portion and the bottom plate forms gap, the upper end of the cylinder portion is communicated with the gas supply component, the support component is arranged on the air outlet plate, to support the air jet component, the airflow regulating component is communicated with air jet component, to adjust the air jet speed of the air jet component.

Description

Technical Field

[0001] This utility model relates to the field of PCB manufacturing technology, and in particular to a PCB drying device. Background Technology

[0002] In the manufacturing process of printed circuit boards (PCBs), the drying process is one of the key steps to ensure product quality. After processes such as etching, solder masking, and cleaning, residual moisture or chemical agents may remain on the surface and inside the PCB. If these are not dried thoroughly and in a timely manner, problems such as circuit oxidation can easily occur, affecting the electrical performance and lifespan of the PCB.

[0003] Currently, commonly used PCB jet drying devices have some shortcomings in practical use: First, they mostly use a single air outlet or an array of air holes to directly spray air, resulting in uneven airflow distribution. Different areas of the PCB surface are heated and dried to varying degrees, and some areas are prone to incomplete drying or over-drying. Second, uneven airflow distribution may also cause high-temperature airflow to concentrate on local areas of the PCB, which can easily cause heat concentration. This is especially true for thin PCBs or PCBs with precision components on their surface, which may lead to risks such as board deformation and component damage. Third, airflow adjustment is mostly based on overall air volume adjustment, which cannot be precisely controlled according to the size of the PCB and the needs of the drying stage, resulting in poor flexibility.

[0004] Therefore, it is necessary to design a PCB drying device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a PCB drying device that achieves uniform air output and avoids heat concentration.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a PCB drying device, comprising an air supply component, an air jet component, a support component, and an airflow regulating component. The air jet component includes an air outlet plate, a guide plate, and a base plate arranged sequentially from top to bottom. The air outlet plate has a through hole in the middle, and a plurality of air outlet holes are formed around the through hole. The edge of the air outlet plate is sealed to the edge of the base plate, and a cavity is formed between the air outlet plate and the base plate. The guide plate includes a cylindrical part sealed to the edge of the through hole of the air outlet plate and a guide part located at the lower opening of the cylindrical part. The guide part is inverted funnel shape, and a gap is formed between the lower edge of the guide part and the base plate. The upper end of the cylindrical part is connected to the air supply component. The support component is disposed on the air outlet plate to support the air jet component. The airflow regulating component is connected to the air jet component to regulate the air jet speed of the air jet component.

[0007] As a further improvement of this utility model, the included angle between the guide portion and the base plate is 5-20°.

[0008] As a further improvement of this utility model, the distance between the edge of the guide portion and the base plate is 5-20mm.

[0009] As a further improvement of the present invention, the airflow regulating component includes a valve body, a valve core, and an air outlet pipe. The valve body is provided with a first channel penetrating the valve body and a second channel communicating with the first channel. One end of the first channel is connected to the air outlet pipe. An regulating air hole is provided on the air outlet plate, and one end of the second channel is connected to the regulating air hole. The valve core is located at the intersection of the first channel and the second channel to connect or close the first channel and the second channel.

[0010] As a further improvement of the present invention, the valve core has an axial opening and a radial opening. The axial opening is normally open toward the first channel, and the radial opening is selectively open toward the second channel. The valve core rotates along the axial direction of the first channel.

[0011] As a further improvement of the present invention, the first channel is horizontally arranged, and the second channel includes a horizontal section perpendicular to the first channel and a vertical section perpendicular to the horizontal section, wherein the opening of the vertical section is connected to the adjusting air hole.

[0012] As a further improvement of the present invention, the gas supply component includes a flat square tube and a circular cap disposed at the end of the flat square tube and communicating with the flat square tube, wherein the circular cap is sealed to the upper opening of the cylinder.

[0013] As a further improvement of the present invention, a baffle is also included, which is disposed above the middle part of the air outlet plate, and a gap is left between the baffle and the air outlet plate.

[0014] As can be seen from the above technical solutions, the PCB drying device of this utility model has the following advantages: 1. The jet assembly adopts a three-layer structure design of air outlet plate, guide plate and base plate, which effectively optimizes airflow distribution. The airflow delivered by the air supply assembly first enters the cylindrical part of the guide plate. After being guided by the inverted funnel-shaped guide part, it diffuses evenly in the radial direction into the cavity formed by the air outlet plate and the base plate. Then it is evenly sprayed out through several air outlet holes on the air outlet plate. After multi-stage guidance and dispersion of airflow, the airflow can be sprayed out at a uniform speed and pressure, which solves the problem of uneven airflow distribution in traditional devices, ensures that all areas of the PCB board are dried synchronously and evenly, and reduces the product defect rate caused by uneven drying.

[0015] 2. The air guide section adopts an inverted trumpet-shaped design, which can diffuse and buffer the concentrated airflow to avoid the high-temperature airflow directly impacting local areas of the PCB board. At the same time, the air outlet holes on the air outlet plate are evenly arranged to further disperse the airflow jet points, so that the heat can be evenly transferred to the surface of the PCB board. In addition, the gap formed between the lower edge of the air guide section and the base plate can balance and regulate the air pressure inside the cavity to prevent excessive local air pressure from causing excessive airflow jet.

[0016] 3. The airflow regulation component is connected to the jet component, which can precisely control the jet speed according to actual production needs, making the device adaptable to diverse production scenarios and improving the versatility and applicability of the equipment.

[0017] 4. The support components are located on the air outlet plate, providing stable support for the jet assembly, ensuring the structural stability of the device during long-term operation and reducing the impact of vibration on the drying effect; in addition, the overall structure of the device is simple and reasonable, and the connection between the components is simple, which facilitates disassembly, cleaning and maintenance in the later stage. Attached Figure Description

[0018] Figure 1 This is a perspective view of a PCB drying device according to an embodiment of the present invention.

[0019] Figure 2 for Figure 1 Cross-sectional view of the PCB drying device.

[0020] Figure 3 for Figure 2 A partially enlarged cross-sectional view of the PCB drying device.

[0021] Figure 4 for Figure 1 A 3D view of a PCB drying device (baffles omitted).

[0022] Figure 5 for Figure 1 Side view and sectional view of the airflow regulation component. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Please refer to Figure 1As shown, this utility model provides a PCB drying device, which includes an air supply component 10, an air jet component 20, a support component 30, and an airflow regulating component 40. The air supply component 10 is connected to the air jet component and is used to provide high-temperature airflow to the air jet component 20. The high-temperature airflow is diffused and uniformly distributed by the air jet component 20 and then ejected from above the air jet component 20. The support component 30 is used to install and support the air jet component 20. The airflow regulating component 40 is connected to the air jet component 20 and is used to regulate the jet speed of the air jet component 20.

[0025] Please participate together Figure 2 and Figure 3 As shown, the jet assembly 20 includes an air outlet plate 21, a guide plate 22, and a base plate 23 arranged sequentially from top to bottom. The air outlet plate 21 has a through hole in its center, and the plate is circular with the through hole located at its center. Several air outlet holes are arranged around the through hole. In this embodiment, the air outlet holes are arranged in two concentric circles centered on the center of the air outlet plate, with each circle of air outlet holes evenly distributed. The edge of the air outlet plate 21 is sealed to the edge of the base plate 23, forming a cavity between the air outlet plate 21 and the base plate 23. The guide plate 22 divides the cavity into upper and lower parts. Specifically, the guide plate 22 includes a cylindrical portion 221 sealed to the edge of the through hole of the air outlet plate 21 and a guide portion 222 located at the lower opening of the cylindrical portion 221. Please refer to... Figure 4 As shown, the gas supply assembly 10 includes a flat square tube 11 and a circular cap 12 located at the end of the flat square tube 11 and communicating with the flat square tube 11. The circular cap 12 is sealed to the upper opening of the cylinder 221.

[0026] The upper end of the cylinder 221 is connected to the air supply assembly 10 (specifically, the circular cover 12). The guide section 222 is inverted funnel-shaped, and a gap of 5-20 mm is formed between the lower edge of the guide section 222 and the base plate 23. The angle between the guide section 222 and the base plate 23 is 5-20°. The support assembly 30 is located on both sides of the edge of the air outlet plate 21 to avoid affecting the air outlet effect. With this configuration, when the air supply assembly 10 introduces airflow into the jet assembly 20, the airflow first enters the funnel-shaped guide section 222 downward through the cylinder 221, and then diffuses radially from the center of the cavity to the edge. Furthermore, the airflow enters the cavity above the guide section 222 from the gap between the edge of the guide section 222 and the base plate 23, and finally sprays upward from the air outlet on the air outlet plate 21. The air guide plate 22 guides, diffuses, and buffers the concentrated airflow delivered by the air supply component 10, achieving uniform distribution of airflow within the cavity while preventing high-temperature airflow from directly impacting the PCB board.

[0027] Please refer to Figure 3 and Figure 5As shown, the airflow regulating assembly 40 includes a valve body 41, a valve core 42, and an air outlet pipe 43. The valve body 41 has a first channel 411 penetrating through the valve body 41 and a second channel 412 communicating with the first channel 411. The valve core 42 is located at the intersection of the first channel 411 and the second channel 412 to connect or close the first channel 411 and the second channel 412. One end of the first channel 411 is connected to the air outlet pipe 413; an regulating air hole is opened on the air outlet plate 21, and one end of the second channel 412 is connected to the regulating air hole. The first channel 411 is horizontally arranged, and the second channel 412 includes a horizontal section perpendicular to the first channel 411 and a vertical section perpendicular to the horizontal section, with the opening of the vertical section connected to the regulating air hole.

[0028] The valve core 42 has an axial opening and a radial opening. The axial opening normally faces the first channel 411, while the radial opening selectively faces the second channel 412. The valve core 42 rotates about the axial direction of the first channel 411. By rotating the valve core 42, the overlapping area of ​​the radial opening and the second channel 412 can be changed, thereby achieving continuous adjustment of the airflow conduction and precise control of the jet speed of the jet assembly 20. The horizontal setting of the first channel 411 and the bending design of the second channel 412 allow the airflow regulating assembly 40 to connect with the regulating air hole without affecting the overall layout of the jet assembly 20. The configuration of the air outlet pipe 43 provides a path for the airflow to be discharged. When it is necessary to reduce the jet speed, the valve core 42 can control part of the airflow to be discharged from the air outlet pipe 43. The adjustment method is flexible and adaptable to the drying requirements of different PCB boards.

[0029] Please refer to Figure 1 and Figure 4 As shown, the PCB drying device also includes a baffle 50, which is located above the center of the air outlet plate 21 (i.e., above the circular cover 12), with a gap between the baffle 50 and the air outlet plate 21. The baffle 50 covers the circular cover 12 and can effectively shield the central area of ​​the concentrated air supply of the air supply component 10, preventing the heat concentration caused by airflow convergence in this area from being conducted upward to the PCB board, thus avoiding damage to the center of the PCB board due to localized high temperature. The gap design between the baffle 50 and the air outlet plate 21 ensures smooth airflow without obstruction, while balancing the guiding and heat insulation effects, achieving safe drying of the PCB board under a uniform airflow and stable temperature environment, especially providing double protection for the precision central area.

[0030] The terms used herein, such as "upper" and "lower," indicating spatial relative position, are for illustrative purposes to describe the relationship of one feature relative to another, as shown in the accompanying drawings. It is understood that, depending on the product's placement, these terms may be intended to include different orientations besides those shown in the figures, and should not be construed as limiting the claims.

[0031] Furthermore, the above embodiments are only used to illustrate the present utility model and are not intended to limit the technical solutions described in the present utility model. The understanding of this specification should be based on those skilled in the art. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present utility model. All technical solutions and improvements that do not depart from the spirit and scope of the present utility model should be covered within the scope of the claims of the present utility model.

Claims

1. A PCB drying device, characterized in that: The device includes an air supply assembly, an air jet assembly, a support assembly, and an airflow regulating assembly. The air jet assembly comprises an air outlet plate, a guide plate, and a base plate arranged sequentially from top to bottom. The air outlet plate has a through hole in the middle, and several air outlet holes are formed around the through hole. The edge of the air outlet plate is sealed to the edge of the base plate, forming a cavity between the air outlet plate and the base plate. The guide plate includes a cylindrical part sealed to the edge of the through hole of the air outlet plate and a guide part located at the lower opening of the cylindrical part. The guide part is inverted funnel-shaped, and a gap is formed between the lower edge of the guide part and the base plate. The upper end of the cylindrical part is connected to the air supply assembly. The support assembly is disposed on the air outlet plate to support the air jet assembly. The airflow regulating assembly is connected to the air jet assembly to regulate the air jet speed of the air jet assembly.

2. The PCB drying apparatus as described in claim 1, characterized in that: The angle between the guide section and the base plate is 5-20°.

3. The PCB drying apparatus as described in claim 2, characterized in that: The distance between the edge of the guide section and the base plate is 5-20mm.

4. The PCB drying apparatus as described in claim 1, characterized in that: The airflow regulating assembly includes a valve body, a valve core, and an air outlet pipe. The valve body has a first channel penetrating the valve body and a second channel communicating with the first channel. One end of the first channel is connected to the air outlet pipe. An regulating air hole is opened on the air outlet plate, and one end of the second channel is connected to the regulating air hole. The valve core is located at the intersection of the first channel and the second channel to connect or close the first channel and the second channel.

5. The PCB drying apparatus as described in claim 4, characterized in that: The valve core has an axial opening and a radial opening. The axial opening is normally open toward the first channel, and the radial opening is selectively open toward the second channel. The valve core rotates along the axial direction of the first channel.

6. The PCB drying apparatus as described in claim 4, characterized in that: The first channel is horizontally positioned, and the second channel includes a horizontal section perpendicular to the first channel and a vertical section perpendicular to the horizontal section, with the opening of the vertical section connected to the regulating air hole.

7. The PCB drying apparatus as described in claim 1, characterized in that: The gas supply assembly includes a flat square tube and a circular cap located at the end of the flat square tube and communicating with the flat square tube. The circular cap is sealed to the upper opening of the cylinder.

8. The PCB drying apparatus as described in claim 1, characterized in that: It also includes a baffle, which is located above the middle part of the air outlet plate, and there is a gap between the baffle and the air outlet plate.

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