Catalyst module for collecting reflow soldering flux

Abstract

The invention relates to a catalyst module for collecting reflow soldering flux. The catalyst module comprises a metal shell (1); the silk screen collector (2) is used for filtering and collecting large particles in the mixed gas; the particle capturing catalyst (3) is used for catalytically decomposing flux residues in the mixed gas; the metal shell (1) is in a hollow cylindrical shape, the silk screen collector (2) and the particle capturing catalyst (3) are detachably installed in the metal shell (1), a metal plate (4) with meshes is detachably installed at an inlet and an outlet of the metal shell (1), the silk screen collector (2) is arranged on the inlet side of the metal shell (1), and the particle capturing catalyst (3) is arranged on the outlet side of the metal shell (1) and is of a pore channel structure. Compared with the prior art, the device is simple in structure, easy to mount and dismount, convenient to maintain and capable of efficiently collecting and removing scaling powder.

Description

Technical Field

[0001] The invention relates to the technical field of reflow soldering, and in particular to a catalyst module for collecting reflow soldering flux. Background Art

[0002] Reflow soldering technology is not unfamiliar in the field of electronic manufacturing. It is one of the three main processes in the SMT mounting process. Reflow soldering is mainly used to solder PCB circuit boards that have already mounted components. Various electrical components are combined with the PCB board through the melting and solidification of solder paste. Solder paste is a paste made of grease-like flux and powdered solder. It is printed and applied to the soldering parts of the PCB board. After the required electronic components are mounted, it is heated and melted in a reflow oven for soldering. The flux in the solder paste is an important auxiliary material in the SMT soldering process. Most of the active flux currently used is based on rosin. Common flux ingredients also include activators, film-forming substances, additives and solvents.

[0003] During the reflow process, flux is an important component of solder paste, but the residues released from the solder paste flux are easy to accumulate inside the furnace, affecting the heat transfer performance of the equipment, and some may even fall onto the circuit board in the furnace to cause interference, so the general reflow oven is equipped with a flux collection and removal device. Some models of HELLER reflow ovens are equipped with flux catalytic reaction devices, but the collection efficiency of the catalyst module currently used has decreased significantly after long-term use and needs to be replaced regularly. Summary of the invention

[0004] The purpose of the present invention is to provide a catalyst module for collecting reflow soldering flux, which has a simple structure, is easy to install and disassemble, and is convenient to maintain.

[0005] The purpose of the present invention can be achieved by the following technical scheme: A catalyst module for collecting reflow soldering flux, comprising: a metal shell; a wire mesh collector for filtering and collecting large particles in a mixed gas; a particle capture catalyst for catalytically decomposing soldering flux residues in the mixed gas;

[0006] The metal shell is in a hollow cylindrical shape, and the wire mesh collector and the particle capture catalyst are detachably installed in the metal shell. A metal plate with mesh holes is detachably installed at the inlet and outlet of the metal shell. The wire mesh collector is arranged on the inlet side of the metal shell, and the particle capture catalyst is arranged on the outlet side of the metal shell and has a channel structure.

[0007] Preferably, the wire mesh collector is woven from metal wires with a diameter of 0.3-0.4 mm.

[0008] Further preferably, the metal wire is an iron-chromium-aluminum electric heating alloy wire.

[0009] Preferably, the mesh size of the wire mesh collector is 5 to 7 meshes.

[0010] More preferably, the wire mesh collector has 6 meshes.

[0011] Preferably, a plurality of wire mesh collectors are provided on the inlet side of the metal shell, and the thickness of each wire mesh collector is 12-13 mm.

[0012] Preferably, the particulate capture catalyst has a honeycomb pore structure.

[0013] Further preferably, the cross-sectional shape of the honeycomb channel structure is a rectangle, the side length of the rectangle is 1.2-1.3 mm, and the distance between adjacent channels is 0.2 mm.

[0014] Further preferably, the particulate capture catalyst comprises a honeycomb substrate and chabazite coated on the honeycomb substrate.

[0015] Preferably, the mesh size of the metal plate is 5 to 7 meshes.

[0016] Preferably, the wire mesh collector and the particle capture catalyst are both cylindrical in structure, and the outer diameter is the same as the inner diameter of the metal shell.

[0017] Preferably, the total thickness of the wire mesh collector and the particulate capture catalyst is the same as the length of the metal shell, and the metal plates installable at the inlet and outlet of the metal shell are respectively in contact with the particulate capture catalyst and the wire mesh collector.

[0018] Preferably, the pore structure of the particle capture catalyst is parallel to the axis of the metal shell.

[0019] Preferably, a handle is provided on the metal plate at the outlet side of the metal shell.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. The cylindrical structure design of the present invention has simple parts, convenient installation, easy installation and disassembly, and convenient maintenance;

[0022] 2. The present invention has a simple and compact structure, which saves some materials and manufacturing and assembly costs, can be built into various flux collection devices for matching use, and can be applied to different types of equipment;

[0023] 3. The present invention uses a multi-layer wire mesh collector and a particle capture catalyst, which has a higher collection efficiency, can collect and capture smaller particles, has a faster catalytic reaction, can efficiently collect and remove flux, and can ensure that a large amount of flux residue will not accumulate in the module;

[0024] 4. The particle capture catalyst of the present invention has stable performance and long service life, and can play the role of collecting and removing solder flux stably for a long time;

[0025] 5. The catalyst module of the present invention has a long service life and does not require maintenance for a long time. Only after a long period of operation does it need to be cleaned or replaced to restore the catalytic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the catalyst module of the present invention;

[0027] Figure 2 An exploded view of the catalyst module of the present invention;

[0028] Figure 3 A side profile view of a particle capture catalyst of the present invention;

[0029] Figure 4 for Figure 3 A local enlarged view of point A;

[0030] Figure 5 for Figure 3 BB partial cross-sectional view;

[0031] In the figure: 1-metal shell, 2-wire mesh collector, 3-particle capture catalyst, 4-metal plate. DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0033] Example 1

[0034] A catalyst module for collecting reflow soldering flux, such as Figures 1-2 As shown, it includes a metal shell 1, a wire mesh collector 2, a particle capture catalyst 3 and a metal plate 4.

[0035] The wire mesh collector 2 and the particle capture catalyst 3 are detachably mounted on the inlet and outlet sides of the hollow cylindrical metal shell 1, respectively, and a metal plate 4 with mesh is also detachably mounted on the inlet and outlet of the metal shell. The wire mesh collector 2 is used to filter and collect large particles in the flux mixed gas, and the particle capture catalyst 3 can capture and filter the residual particles of the flux, and can decompose and absorb the residual particles of the flux through a catalytic reaction.

[0036] The cylindrical structure design of this embodiment has simple parts and components, is easy to install, saves some materials and manufacturing and assembly costs, can be built into various flux collection devices for matching use, and can be suitable for different types of equipment.

[0037] Example 2

[0038] A catalyst module for collecting reflow soldering flux comprises a cylindrical metal shell 1, a wire mesh collector 2, a particle capture catalyst 3 and a metal plate 4.

[0039] The wire mesh collector 2 and the particle capture catalyst 3 are installed in the metal shell 1. The two ends of the cylindrical metal shell 1 are metal plates 4 with meshes. The mesh of the metal plate 4 is close to 6 meshes. The wire mesh collector 2 has seven layers for filtering and collecting large particles in the flux mixed gas.

[0040] The wire mesh collector 2 is woven from metal wires with a diameter of 0.35 mm. The thickness of each layer of the wire mesh collector is about 12.7 mm. The material is iron-chromium-aluminum electric heating alloy, grade 0Cr25A15, which can play a filtering and collecting role in a high temperature environment.

[0041] The particulate capture catalyst 3 includes a honeycomb ceramic with a certain pore density and chabazite loaded thereon. The gas passes through the alternately blocked honeycomb porous ceramic filter body, and the airflow is forced to pass through the channel wall. The particulate matter is captured and filtered by diffusion, interception, gravity and inertia. When the particulate matter in the particulate capture catalyst 3 accumulates to a certain extent, it will undergo a catalytic reaction under the catalysis of chabazite at an ambient temperature of 450°C to 500°C and be decomposed and absorbed.

[0042] The basic principle of the catalyst module of this embodiment is:

[0043] After the mixed gas with flux residue enters from the mesh plate (metal plate 4) at one end of the cylindrical metal shell 1, it first passes through the seven-layer wire mesh collector 2 to filter out large particles in the mixed gas, and then the gas passes through the particle capture catalyst 3, where the particles are captured and filtered. When the particles in the particle capture catalyst 3 accumulate to a certain extent, a reaction will occur in the catalyst module, and then the flux residue will be decomposed and absorbed, and the clean gas will be discharged from the mesh plate (metal plate 4) at the other end of the metal shell 1. During the reflow process, the hot air with flux will continuously circulate through the catalyst module, and the flux residue will be collected and removed.

[0044] Example 3

[0045] A catalyst module for collecting reflow soldering flux, such as Figures 3 to 5As shown, the honeycomb ceramic has a pore structure with a rectangular cross-section, the side length of the rectangle is 1.24 mm, and the distance between adjacent pores is 0.2 mm. The chabazite loaded on the honeycomb ceramic is copper-based chabazite (Cu-CHA), and the composition includes 85wt% silicon dioxide, 12wt% aluminum oxide, and 3wt% copper oxide. The rest is the same as Example 2.

[0046] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A catalyst module for collecting reflow soldering flux, characterized in that: include: Metal housing (1); A wire mesh collector (2) for filtering and collecting large particles in the mixed gas; A particle capture catalyst (3) for catalytically decomposing flux residues in a mixed gas; The metal shell (1) is in the shape of a hollow cylinder. The wire mesh collector (2) and the particle capture catalyst (3) are detachably installed in the metal shell (1). A metal plate (4) with mesh holes is detachably installed at the inlet and outlet of the metal shell (1). The wire mesh collector (2) is arranged on the inlet side of the metal shell (1), and the particle capture catalyst (3) is arranged on the outlet side of the metal shell (1) and has a pore structure.

2. The catalyst module for collecting reflow soldering flux according to claim 1, characterized in that: The wire mesh collector (2) is woven from metal wires, and the diameter of the metal wires is 0.3-0.4 mm.

3. The catalyst module for collecting reflow soldering flux according to claim 2, characterized in that: The metal wire is an iron-chromium-aluminum electric heating alloy wire.

4. The catalyst module for collecting reflow soldering flux according to claim 1, characterized in that: The mesh number of the wire mesh collector (2) is 5 to 7 meshes.

5. The catalyst module for collecting reflow soldering flux according to claim 1, characterized in that: The inlet side of the metal shell (1) is provided with a plurality of wire mesh collectors (2), and the thickness of each wire mesh collector (2) is 12-13 mm.

6. The catalyst module for collecting reflow soldering flux according to claim 1, characterized in that: The particle capture catalyst (3) has a honeycomb pore structure.

7. The catalyst module for collecting reflow soldering flux according to claim 6, characterized in that: The cross-sectional shape of the honeycomb channel structure is a rectangle, the side length of the rectangle is 1.2-1.3 mm, and the distance between adjacent channels is 0.2 mm.

8. The catalyst module for collecting reflow soldering flux according to claim 6, characterized in that: The particle capture catalyst (3) comprises a honeycomb substrate and chabazite coated on the honeycomb substrate.

9. The catalyst module for collecting reflow soldering flux according to claim 1, characterized in that: The mesh number of the metal plate (4) is 5 to 7 meshes.

10. The catalyst module for collecting reflow soldering flux according to claim 1, characterized in that: The wire mesh collector (2) and the particle capture catalyst (3) are both cylindrical structures, and their outer diameters are the same as the inner diameter of the metal shell (1).

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