A multi-layer composite structure dust-proof and air-permeable screen plate used in hydrogen mill gas circuit

Abstract

The utility model discloses a multilayer composite structure dust separation and air permeable screen board for hydrogen crusher gas circuit, including the outer layer stainless steel framework of circular frame structure, is provided with a plurality of radial stiffener in the framework, and the whole is divided into a plurality of air permeable window. Cover multiple layers of partition metal screen at each air permeable window, the screen includes at least two layers of different mesh number metal screen, and the step-by-step dust separation and good air permeability are kept through multilayer combination. The center locking hole is set up in the screen board center, and is used for locking and fixing when multiple screen boards are superimposed, and the positioning hole is set up in the framework edge, and is used for the alignment and angle positioning in the assembly process. The utility model discloses structure high temperature -resistant, installation stable, can effectively reduce the pollution of hydrogen crushing process dust to the gas circuit, significantly improve the air permeability and reduce the pressure difference, prolong the equipment use cycle.

Description

Technical Field

[0001] This utility model relates to a breathable mesh plate, specifically a multi-layer composite structure dust-proof and breathable mesh plate used in the gas path of a hydrogen crushing furnace. Background Technology

[0002] In the preparation of sintered NdFeB materials, the belt spinning + hydrogen crushing process is the mainstream powder preparation method commonly used in the industry. Domestic hydrogen crushing furnaces typically use stainless steel reactors and employ vacuuming, hydrogen absorption, dehydrogenation, and cooling processes via gas supply and exhaust pipes. During the hydrogen absorption crushing process, the NdFeB castings undergo intergranular fracture, releasing a large amount of heat; the material temperature can reach as high as 350°C to 500°C. In the subsequent dehydrogenation stage, the material needs to be further heated to 580°C to 600°C. The reactor rotates continuously throughout the process, and the mechanical collisions and fractures between materials generate a large amount of dust, which can easily enter the gas supply system and contaminate the vacuum pipeline.

[0003] Dust accumulation in the air supply and exhaust system can lead to a decrease in vacuum and pipe blockage, severely affecting the stability of the vacuum system and the normal operation of the hydrogen crushing process. Therefore, installing a dust-proof and breathable structure between the reactor and the gas line is an important measure to maintain reliable equipment operation.

[0004] In existing technologies, some hydrogen crushing furnaces use cermet mesh as dust-proof and breathable components. These meshes offer advantages such as high temperature resistance, high mechanical strength, and good breathability. However, their labyrinthine pore structure leads to significant air resistance, easily creating a large pressure difference between the reactor and pipelines. Simultaneously, dust entering the channels under high temperatures is prone to sintering and clogging, making cleaning difficult after long-term use and requiring frequent replacement, resulting in high operating costs. Furthermore, cermet meshes are expensive, requiring substantial maintenance, which is detrimental to long-term stable production. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a multi-layer composite structure dustproof and breathable mesh plate for use in the gas path of a hydrogen crushing furnace. This dustproof and breathable mesh plate offers greater structural stability, better air permeability, easier maintenance, and lower cost, thus solving problems such as high air resistance, easy clogging, inability to clean, and high cost associated with ceramic mesh plates. This, in turn, improves the reliability and service life of the hydrogen crushing furnace gas path system.

[0006] This utility model is achieved through the following technical solution: a multi-layer composite structure dustproof and breathable mesh plate for use in the gas path of a hydrogen crusher, comprising: The outer stainless steel frame, in the form of a circular frame structure, is used to provide support and maintain the overall shape of the structure; Multiple radial reinforcing plates arranged inside the outer skeleton divide the circular space into multiple ventilation windows; The multi-layered metal mesh covering the ventilation window includes at least two layers of metal mesh with different mesh counts, used to achieve step-by-step dust isolation while maintaining air permeability; A central locking hole located at the center of the stencil is used for central fixation through a locking structure when multiple stencils are stacked. The positioning holes provided on the edge of the outer skeleton are used for stacking alignment or angular positioning during installation.

[0007] As a preferred technical solution, the central locking hole is used to cooperate with screws, studs, pressure plates or central shafts to achieve central locking and fixing when multi-layer mesh panels are stacked.

[0008] As a preferred technical solution, the positioning holes are located on the circumference of the outer skeleton and are used for angle calibration and edge positioning when multiple mesh plates are stacked.

[0009] As a preferred technical solution, the multi-layer metal screen has a detachable structure and is fixed to the inner side of the outer skeleton by means of a pressure frame, a slot or screws.

[0010] As a preferred technical solution, the radial reinforcing plates are distributed at a uniform angle to form a radial structure, so as to enhance the overall strength and maintain the uniform stress on the multi-layer screen.

[0011] As a preferred technical solution, the outer skeleton, radial reinforcing plate and central locking hole are integrally laser-cut or stamped from stainless steel plate.

[0012] The beneficial effects of this invention are as follows: By employing multiple layers of metal mesh with different mesh sizes within the outer stainless steel frame to form a composite dust-proof and breathable structure, dust is progressively blocked within the multiple layers of mesh, effectively preventing dust from directly entering the vacuum path and thus significantly reducing the pollution risk of the air supply and exhaust system. Compared with existing metal-ceramic mesh plates, this structure significantly reduces air resistance, effectively lowering the pressure difference between the reactor and the gas path, making the vacuuming, hydrogen absorption, and dehydrogenation processes more stable, and improving the operating efficiency of the equipment.

[0013] The multi-layered metal screen and frame structure are both made of metal, possessing excellent high-temperature resistance, and can withstand long-term use in hydrogen crushing furnaces at temperatures ranging from 350℃ to 600℃, avoiding the difficulty in cleaning ceramic materials after high-temperature dust sintering. The central locking hole and edge positioning holes of this invention ensure more accurate and stable assembly of the multi-layered screen panels, guaranteeing consistent air permeability and reliability of the composite structure under high-temperature and high-flow-rate environments.

[0014] Furthermore, the metal screen of this invention can be disassembled for cleaning or replacement after clogging, significantly reducing maintenance costs and downtime; its overall manufacturing cost is far lower than that of ceramic screens, its service life is longer, and its economic efficiency is higher. In summary, this invention offers significant advantages in dust-proof performance, air permeability, installation and maintenance, and cost control, and has significant practical value. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0017] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0018] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0019] like Figure 1 As shown, in one embodiment of a multi-layer composite dust-proof and breathable mesh plate used in the gas path of a hydrogen crusher, the entire mesh plate structure is made of stainless steel to adapt to the high-temperature, high-dust, and high-airflow impact environment during the hydrogen absorption and dehydrogenation process of the hydrogen crusher. The mesh plate consists of an outer stainless steel skeleton 1 forming the main frame. The skeleton has a circular structure and is integrally cut to form a stable outer ring, ensuring that the mesh plate's geometry does not deform under high-temperature conditions. The outer stainless steel skeleton 1 not only forms the outer supporting frame but also connects the screen and provides structural rigidity, enabling the entire mesh plate to withstand the powder impact and airflow pressure from the rotating reactor.

[0020] A multi-layered metal screen 2 is installed inside the outer stainless steel frame 1. The metal screen is made of high-temperature resistant metal mesh, and at least two layers of different mesh sizes are stacked according to usage requirements. The outermost screen intercepts larger particles of powder generated during hydrogen absorption and crushing, while the innermost screen further blocks finer dust, achieving step-by-step filtration of the gas during passage. The multi-layered metal screen 2 is fixed to the frame structure by compression or screwing, ensuring a tight fit between the screen layers. This allows it to remain flat even at high temperatures, preventing localized warping or detachment due to dust accumulation. The multi-layered layout of the metal screen not only improves dust isolation but also ensures smooth gas passage under low gas resistance conditions, helping to reduce the pressure difference between the reactor and the exhaust pipe.

[0021] A central locking hole 3 is provided at the center of the mesh structure. This hole is used to achieve center alignment and locking when multiple mesh panels are stacked. The central locking hole 3 can be used with screws, a central shaft, or a clamping structure to ensure accurate alignment of the multi-layer mesh panels along the center position during assembly, preventing the screen layers from shifting under high temperature or vibration conditions. Axial locking through the central locking hole 3 ensures consistent adhesion between the screen layers, thereby ensuring that the multi-layer partition metal screen 2 maintains stable filtration performance throughout overall operation.

[0022] Positioning holes 4 are provided around the circumference of the outer stainless steel frame 1. These holes are used for edge alignment and angle calibration during the mesh plate stacking process, and can also be used as installation reference points when the mesh plates are assembled onto the end face of the hydrogen crushing furnace reactor. The positioning holes 4 ensure that multiple mesh plates maintain a consistent angle in the radial direction, keeping the orientation of each layer of screen and the frame structure uniform. This avoids inconsistencies in the screen channels caused by misalignment, ensuring a uniform and continuous overall airflow path. The positioning holes 4 also provide accurate installation positions during maintenance and disassembly, allowing the mesh plates to maintain their original structural layout after repeated assembly, ensuring dust isolation and airflow stability.

[0023] In practical applications, the multi-layer composite dust-proof and breathable mesh plate of this embodiment is installed between the hydrogen crushing furnace reactor and its supply and exhaust pipelines. When the NdFeB material in the reactor undergoes intergranular breakage and generates a large amount of dust during hydrogen absorption, the gas first comes into contact with the multi-layer partition metal screen 2. The dust is filtered step by step and blocked outside the screen, while the hydrogen or exhaust gas can pass smoothly through the screen layer with low resistance and enter the subsequent pipeline system. The outer stainless steel frame 1 provides sufficient support to keep the mesh plate structurally stable under the conditions of high-temperature gas impact and dust scouring; the central locking hole 3 and the positioning hole 4 work together to make the installation of the multi-layer structure more precise and firm, and will not shift or loosen due to vibration or temperature changes.

[0024] This implementation method combines an outer stainless steel frame 1, a multi-layer partition metal screen 2, a central locking hole 3, and a positioning hole 4, giving the screen superior performance in terms of dust isolation efficiency, air permeability, high temperature resistance, and ease of maintenance. It can effectively solve problems such as dust blockage in the gas path of the hydrogen crushing furnace, increased pressure difference, and high cost and difficulty in cleaning of ceramic screens.

[0025] 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 changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A multi-layer composite structure dust-proof and breathable mesh plate for use in the gas path of a hydrogen crusher, characterized in that, include: The outer stainless steel frame (1) has a circular frame structure and is used to provide support and maintain the overall shape of the structure; Multiple radial reinforcing plates arranged inside the outer skeleton divide the circular space into multiple ventilation windows; The multi-layer partition metal screen (2) covering the ventilation window includes at least two layers of metal screens with different mesh numbers, which are used to achieve step-by-step dust isolation while maintaining air permeability; A central locking hole (3) is set at the center of the mesh plate, which is used to fix the center of the mesh plate by means of a locking structure when multiple mesh plates are stacked; The positioning holes (4) provided on the edge of the outer skeleton are used for stacking alignment or angle positioning during installation.

2. The multi-layer composite structure dustproof and breathable mesh plate for use in the gas path of a hydrogen crusher according to claim 1, characterized in that: The central locking hole (3) is used to cooperate with screws, studs, pressure plates or central shafts to achieve central locking and fixing when multi-layer mesh plates are stacked.

3. The multi-layer composite structure dustproof and breathable mesh plate for use in the gas path of a hydrogen crusher according to claim 1, characterized in that: The positioning hole (4) is set at the circumference of the outer skeleton and is used for angle calibration and edge positioning when multiple mesh plates are stacked.

4. The multi-layer composite structure dustproof and breathable mesh plate for use in the gas path of a hydrogen crusher according to claim 1, characterized in that: The multi-layer metal screen is a detachable structure, which is fixed to the inner side of the outer frame by pressure frame, slot or screw.

5. The multi-layer composite structure dustproof and breathable mesh plate for use in the gas path of a hydrogen crusher according to claim 1, characterized in that: The radial reinforcing plates are distributed at a uniform angle to form a radial structure, thereby enhancing the overall strength and maintaining uniform stress on the multi-layer screen.

6. The multi-layer composite structure dustproof and breathable mesh plate for use in the gas path of a hydrogen crusher according to claim 1, characterized in that: The outer skeleton, radial reinforcing plates, and central locking holes are integrally laser-cut or stamped from stainless steel plates.

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