Reflow soldering furnace heating module

Abstract

The utility model relates to a kind of reflow soldering furnace heating module, including outer box, inner box, air uniforming layer board, hot air hole plate, heating assembly and blowing motor assembly;Inner box is installed in outer box and forms suction cavity between inner box and outer box;Air uniforming layer board is installed in the side of inner box away from outer box and with inner box form hot air cavity, heating assembly is installed in hot air cavity;Blowing motor assembly passes through suction cavity and hot air cavity;Hot air hole plate is installed in the side of outer box close to inner box, and hot air hole plate both sides are equipped with suction hole, middle part is equipped with air outlet, suction hole is connected with suction cavity, and air outlet is connected with hot air cavity.Compared with prior art, the utility model has suction hole located in hot air hole plate both sides, is connected with suction cavity, so that the suction area of heating module of different temperature zone of reflow soldering furnace can be well isolated, adjacent temperature zone is not easy to absorb the airflow of the other party, not easy to string temperature, and the airflow stability of each heating module is stronger, etc.

Description

Technical Field

[0001] This utility model relates to reflow ovens, and more particularly to a reflow oven heating module. Background Technology

[0002] In SMT production, various electrical components are bonded to the PCB board by the melting and solidification of solder paste. Controlling the soldering process throughout the entire heating and cooling phases is crucial, especially the heating phase. As surface mount technology and processes mature, users are constantly placing new demands on reflow ovens. With the development of 5G technology, users' products are becoming increasingly larger, requiring reflow ovens to achieve high-quality component soldering. This places new demands on equipment capacity, energy efficiency, and equipment maintenance, all in pursuit of maximizing economic benefits.

[0003] Currently, reflow ovens include four temperature zones: preheating zone, holding zone, reflow zone, and cooling zone. Each zone consists of several modules, and the temperature settings of each zone differ. Since the PCB board passes through these temperature zones sequentially, the transport channels between different zones are interconnected. The PCB board is placed on the support pins of chains within the tracks, and two tracks and two chains within them support the sides of the PCB board for transport within the oven chamber. This necessitates minimizing the mutual interference between the suction and blowing airflow of each module; however, the following problems may occur during actual operation.

[0004] 1. Since the zones are relatively close to each other, there is a problem of hot and cold air flowing between them. When hot air flows into the cooling zone, it will affect the cooling efficiency; when cold air enters the recirculation zone, it will affect the stability of the recirculation process temperature in the recirculation zone.

[0005] Second, in order to ensure a low oxygen content in the reflux zone, a certain amount of nitrogen is usually introduced into the reflux zone. However, when nitrogen is introduced, some of it will flow into the cooling zone, so there is an uncontrollable risk in adjusting the oxygen content.

[0006] Third, currently, the air intake is formed through the gap between the outer and inner housings of the module. The size of the air intake is easily affected by processing errors and sheet metal deformation, resulting in different air pressure levels across the modules.

[0007] Fourth, the air intakes on both sides can easily draw away the air from adjacent modules, but the temperature settings of each module are different, causing cross-temperature.

[0008] A search revealed that application publication number CN119016825A discloses a uniform flow and temperature heating module for a reflow oven. Specifically, it discloses an air outlet plate and a pair of air inlets at the lower opening of the heating hood. The pair of air inlets have openings for two separate air chambers to seal the air chambers. The air outlet plate is located between the pair of air inlets and seals the area between a pair of partitions at the lower end of the heating hood. The air outlet plate, air inlets, and static pressure chamber are all perforated plates. The suction chamber and static pressure chamber are used to ensure uniform and high-speed airflow. However, the suction plates in this prior art are still located on both sides, which can easily interfere with adjacent modules.

[0009] In summary, the technical problem that needs to be solved is how to design a reflow oven heating module that can reduce interference between adjacent heating modules. Utility Model Content

[0010] The purpose of this invention is to overcome the defects of the prior art, which is that adjacent heating modules are prone to interference, and to provide a reflow oven heating module.

[0011] The objective of this utility model can be achieved through the following technical solutions.

[0012] According to one aspect of the present invention, a reflow oven heating module is provided, comprising an outer casing, an inner casing, an air distribution plate, a hot air perforation plate, a heating assembly, and a blower motor assembly; the inner casing is installed inside the outer casing, and an air intake cavity is formed between the inner casing and the outer casing; the air distribution plate is installed on the side of the inner casing away from the outer casing and forms a hot air cavity with the inner casing, and the heating assembly is installed inside the hot air cavity; the blower motor assembly passes through the air intake cavity and the hot air cavity; the hot air perforation plate is installed on the side of the outer casing near the inner casing, and the hot air perforation plate has air intake holes on both sides and an air outlet hole in the middle, the air intake holes communicating with the air intake cavity, and the air outlet hole communicating with the hot air cavity.

[0013] As a preferred technical solution, the heating module is a cuboid in shape. The air intake holes are located on two opposite first sides of the hot air perforation plate, and the outer casing has air inlets on two opposite second sides away from the hot air perforation plate. The first and second sides are perpendicular to each other.

[0014] As a preferred technical solution, the heating assembly includes a mounting plate and a heating wire, the mounting plate being fixed to the inner surface of the inner housing, and the heating wire being mounted on the mounting plate.

[0015] As a preferred technical solution, there are two heating components, located on both sides of the impeller of the blower motor assembly.

[0016] As a preferred technical solution, the heating wire is arc-shaped and surrounds the side of the impeller of the blower motor assembly.

[0017] As a preferred technical solution, the air-distributing layer is a mesh structure.

[0018] As a preferred technical solution, a sealing sheet metal strip is installed at the connection between the hot air perforated plate and the outer casing.

[0019] As a preferred technical solution, the air outlet array is arranged such that the distance between adjacent rows of air outlets is greater the closer they are to the center of the hot air perforation plate.

[0020] As a preferred technical solution, the air intake hole is a waist-shaped hole.

[0021] As a preferred technical solution, the heating component is installed in the middle of the hot air cavity.

[0022] Compared with the prior art, the present invention has the following beneficial effects.

[0023] 1) The suction holes of this utility model are located on both sides of the hot air perforated plate and connected to the suction cavity, so that the suction areas of the heating modules of different temperature zones in the reflow oven can be well isolated. Adjacent modules are suctioned through the suction holes, and it is not easy to suck in the air of other modules, ensuring the independence of the air between each module, making it less likely to cause cross-temperature, and the airflow stability of each heating module is stronger; adjacent temperature zones are less likely to suck in the airflow of each other, and it is less likely to cause cross-temperature.

[0024] 2) The suction holes and air inlets of this utility model form a four-sided suction structure, which increases the suction area and wind pressure, and does not cause local suction strength to be weak or strong. The temperature uniformity is better and the efficiency is higher. It makes the airflow between different temperature zones inside the reflow oven less fluid and less prone to turbulence. The spacing between the suction holes is widened, and the gas exchange between the inside of the furnace and the outside is small. As a result, the furnace can achieve the required oxygen concentration value with less nitrogen consumption, which greatly reduces the cost of reflow soldering.

[0025] 3) The hot air perforated plate and the outer casing of this utility model are connected by a sealing sheet metal strip, which makes the entire module more airtight.

[0026] 4) The two heating components of this utility model are located on both sides of the impeller of the blower motor assembly, which can make the air blown into the hot air cavity by the impeller evenly heated; the heating wire is arc-shaped, which fits the shape of the impeller better and further improves the uniformity of hot air heating.

[0027] 5) The present invention adopts a waist-shaped hole with the largest opening area within a certain width range, which is easy to process; the air outlet array on the hot air perforated plate is arranged such that the closer to the center of the hot air perforated plate, the farther the distance between two adjacent rows of air outlets. Since the blower motor assembly is located in the middle of the module, by adjusting the distance between the air outlets, the unevenness of the air can be changed, and the hot air can be blown evenly to the product surface. Attached Figure Description

[0028] Figure 1 This is an exploded view of a reflow oven heating module according to the present invention.

[0029] Figure 2 This is a bottom view of a reflow oven heating module according to the present invention.

[0030] Figure 3 This is a schematic diagram of the structure of a reflow oven heating module of the present invention, with part of the uniform air layer plate and hot air perforated plate removed.

[0031] The numbers in the diagram are as follows:

[0032] 1. Outer casing; 10. Air inlet; 2. Inner casing; 3. Air distribution plate; 4. Hot air perforation plate; 40. Air intake hole; 41. Air outlet hole; 5. Heating assembly; 50. Mounting plate; 51. Heating wire; 6. Blower motor assembly. Detailed Implementation

[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0034] like Figure 1 As shown, this utility model provides a reflow oven heating module, including an outer casing 1, an inner casing 2, a uniform air distribution plate 3, a hot air perforated plate 4, a heating component 5, and a blower motor component 6.

[0035] The outer casing 1 is a cuboid and has no bottom surface. Two opposite sides with smaller areas are provided with rectangular air inlets 10 on the side near the top surface.

[0036] The inner casing 2 is a rectangular parallelepiped without a bottom surface. The width and height of the inner casing 2 are smaller than those of the outer casing 1. The inner casing 2 is located inside the outer casing 1. A suction cavity is formed between the top surface of the inner casing 2 and the top surface of the outer casing 1. A suction channel connecting the suction cavity and the suction inlet is formed between the larger side surface of the inner casing 2 and the larger side surface of the outer casing 1. The air inlet 10 of the outer casing 1 is connected to the suction cavity.

[0037] The uniform air distribution plate 3 is rectangular in shape and is installed on the inner side of the bottom surface of the inner box 2, forming a hot air cavity with the inner box 2. The uniform air distribution plate 3 has a mesh structure, and the hot air in the hot air cavity reaches the hot air perforated plate 4 through the uniform air distribution plate 3 and is blown out from the air outlet 41.

[0038] like Figure 2As shown, the hot air perforated plate 4 is rectangular in shape and is installed on the bottom surface of the outer casing 1. A sealing sheet metal strip is installed at the connection between the hot air perforated plate 4 and the outer casing 1 to improve the overall sealing performance of the module. There is a certain distance between the hot air perforated plate 4 and the uniform air layer plate 3. A row of air inlets is provided on both sides of the long side of the hot air perforated plate 4, and an array of air outlets 41 are provided at other positions. The closer to the center of the hot air perforated plate 4, the farther the distance between two adjacent rows of air outlets 41 is. The side of the inner casing 2 is in contact with the hot air perforated plate 4 at the edge of the bottom surface. The outer edge of the inner casing 2 is a suction hole 40, and the inner edge is an air inlet.

[0039] The air inlet is an elongated, slotted hole, which increases the distance between modules, making airflow between adjacent modules less affected. The elongated shape also maximizes the opening area within a certain width range, making it easier to manufacture. The side containing the air inlet is perpendicular to the side containing the air inlet 10.

[0040] The blower motor assembly 6 passes through the suction chamber and the hot air chamber, blowing the room-temperature gas in the suction chamber into the hot air chamber for heating. The impeller of the blower motor assembly 6 is located in the hot air chamber.

[0041] like Figure 3 As shown, the heating assembly 5 includes a mounting plate 50 and a heating wire 51. The heating wire 51 is semi-circular in shape. The mounting plate 50 is fixed to the inner surface of the top surface of the inner housing 2, and the heating wire 51 is fixed to the mounting plate 50. There are two heating assemblies 5, located on both sides of the impeller of the blower motor assembly 6. The two semi-circular heating wires 51 surround the impeller to heat the gas blown into the hot air cavity. The blower motor assembly 6 is located in the middle of the suction cavity and the hot air cavity, and the heating assembly 5 is located in the middle of the hot air cavity.

[0042] The working process of this utility model is as follows:

[0043] The suction chamber draws in air from the four sides where the suction inlet and suction hole 40 are located. Figure 3 The middle arrow indicates the direction of gas entry. The blower motor assembly 6 blows the room temperature gas in the suction chamber into the hot air chamber through the high-speed rotation of the impeller. The heating assembly 5 in the hot air chamber heats the gas blown into the hot air chamber into hot gas. The hot gas passes through the air distribution plate 3 and reaches the hot air perforated plate 4, and is blown out through the air outlet 41 on the hot air perforated plate 4 to heat the product.

[0044] This invention effectively isolates the air intake areas within different temperature zones, preventing adjacent zones from drawing air from each other and reducing temperature cross-contamination. This results in more stable and consistent airflow across each heating module. The four-sided air intake structure minimizes airflow between temperature zones within the reflow oven, reducing turbulence. The wider spacing between the air intake holes minimizes gas exchange between the furnace interior and exterior, leading to lower nitrogen consumption while maintaining the required oxygen concentration, effectively reducing nitrogen input costs. It also reduces mutual interference between adjacent modules and avoids issues caused by manufacturing errors and sheet metal deformation resulting in inconsistent intake hole sizes. Furthermore, it provides a larger effective heating range and better temperature uniformity. Finally, it reduces heat transfer from the modules to the outside, resulting in energy savings.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A reflow oven heating module, characterized in that, The device includes an outer casing (1), an inner casing (2), a uniform air distribution plate (3), a hot air perforation plate (4), a heating assembly (5), and a blower motor assembly (6). The inner casing (2) is installed inside the outer casing (1), and a suction cavity is formed between the inner casing (2) and the outer casing (1). The uniform air distribution plate (3) is installed on the side of the inner casing (2) away from the outer casing (1) and forms a hot air cavity with the inner casing (2). The heating assembly (5) is installed inside the hot air cavity. The blower motor assembly (6) passes through the suction cavity and the hot air cavity. The hot air perforation plate (4) is installed on the side of the outer casing (1) close to the inner casing (2). The hot air perforation plate (4) has suction holes (40) on both sides and an air outlet (41) in the middle. The suction holes (40) are connected to the suction cavity, and the air outlet (41) is connected to the hot air cavity.

2. The reflow oven heating module according to claim 1, characterized in that, The heating module is a cuboid in shape. The air intake (40) is located on two opposite first sides of the hot air intake plate (4). The outer casing (1) has air inlets (10) on two opposite second sides away from the hot air intake plate (4). The first and second sides are perpendicular to each other.

3. A reflow oven heating module according to claim 1, characterized in that, The heating assembly (5) includes a mounting plate (50) and a heating wire (51). The mounting plate (50) is fixed to the inner surface of the inner box (2), and the heating wire (51) is mounted on the mounting plate (50).

4. A reflow oven heating module according to claim 3, characterized in that, The heating components (5) are two in number, located on both sides of the impeller of the blower motor assembly (6).

5. A reflow oven heating module according to claim 3 or 4, characterized in that, The heating wire (51) is arc-shaped and surrounds the side of the impeller of the blower motor assembly (6).

6. A reflow oven heating module according to claim 1, characterized in that, The air distribution plate (3) is a mesh structure.

7. A reflow oven heating module according to claim 1, characterized in that, A sealing sheet metal strip is installed at the connection between the hot air perforated plate (4) and the outer casing (1).

8. A reflow oven heating module according to claim 1, characterized in that, The air outlet (41) array is arranged such that the distance between two adjacent air outlets (41) is greater the closer they are to the center of the hot air perforation plate (4).

9. A reflow oven heating module according to claim 1, characterized in that, The air intake hole (40) is a waist-shaped hole.

10. A reflow oven heating module according to claim 1, characterized in that, The heating component (5) is installed in the middle of the hot air cavity.

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