A backflow prevention mesh gas shield for an atomization chamber

Abstract

A backflow prevention net gas protection cover for an atomization chamber, comprising a protection cover body, characterized in that the protection cover body is a high-temperature-resistant conical porous net structure, and the protection cover body is installed at a backflow prone area of a side wall of the atomization chamber; the protection cover is a high-temperature-resistant porous net structure, and is installed at the backflow prone area of the side wall of the atomization chamber, so that the mesh structure can directly intercept solidified particles in the backflow area, block the upward revolving path of the solidified particles, and make the solidified particles unable to enter a main flow area of an atomization cone to collide with un-solidified droplets; meanwhile, the solidified particles intercepted by the mesh structure slide along the mesh surface to a collection area under the action of gravity, and are prevented from being re-rolled into the airflow after accumulation. The utility model has a reasonable structure, plays a physical blocking role, effectively prevents backflow particles from colliding with atomized droplets to form satellite powder, and ensures stable powder production quality.

Description

Technical Field

[0001] This utility model relates to a protective cover, specifically a backflow prevention mesh gas protective cover for an atomization chamber. Background Technology

[0002] Inert gas atomization powder production process involves refining pre-made alloy rods in a zone. Liquid metal flows continuously and vertically through a nozzle, where a high-pressure gas stream atomizes and breaks it into numerous tiny droplets, which solidify into particles during flight. However, current powder production processes suffer from macroscopic vortices (recirculation zones) near the sidewalls due to the enclosed structure of the atomization chamber. This recirculation carries solidified small particles upwards, colliding and adhering to larger, unsolidified droplets upstream of the atomization cone, forming satellite powder. Satellite powder, or defective powder formed by several small particles adhering to the surface of larger particles, causes metal powder agglomeration and poor flowability, directly affecting powder uniformity and leading to defects such as interlayer cracks and porosity, significantly reducing the strength of printed parts.

[0003] Existing technologies mainly improve powder morphology by optimizing atomization parameters or nozzle structure, but it is difficult to suppress backflow at the macroscopic flow field level.

[0004] An investigation revealed that the existing Chinese patent CN202010612470.9, entitled "A Gas Atomization Powder Making Device for Reducing Satellite Powder," adds a second nozzle to the bottom of the atomization chamber to introduce bottom airflow, thereby lowering the temperature of the atomization chamber and improving the trajectory of the backflow airflow. It also promotes cooling of the atomized droplets through an annular auxiliary gas from a ring-shaped jet device, and implements reverse-jet argon gas at the bottom of the atomization chamber to accelerate cooling while reducing the probability of collision and adhesion between metal droplets during powder atomization, thus reducing powder agglomeration, improving powder flowability, and lowering the satellite powder content of the gas-atomized powder. However, the structure is relatively complex, and it is difficult to suppress backflow at the macroscopic flow field level.

[0005] Therefore, there is an urgent need to develop a device that can physically block the collision of backflowing particles in order to solve the problem of satellite powder generation caused by backflow on the sidewall of the atomization chamber. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a backflow prevention mesh gas protection cover for atomization chamber that has a reasonable structure and good performance, in view of the above-mentioned technical status.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a backflow prevention mesh gas protection cover for an atomization chamber, comprising a protective cover body, characterized in that: the protective cover body is a high-temperature resistant conical porous mesh structure, and the protective cover body is installed on the side wall of the atomization chamber in an area prone to backflow.

[0008] Furthermore, the main body of the protective cover is woven from high-temperature resistant metal wire with a wire diameter of 0.2 to 0.8 mm.

[0009] Furthermore, the mesh density of the main body of the protective cover is 20 to 800 meshes.

[0010] Furthermore, the opening ratio of the protective cover body is ≥60%.

[0011] Finally, the protective cover body is installed at the lower end of the nozzle, and its conical angle matches the conical nozzle orifice. The upper end of the protective cover body is in contact with the inner wall of the conical nozzle orifice.

[0012] Compared with existing technologies, the advantages of this invention are as follows: the protective cover is a high-temperature resistant porous mesh structure, installed on the side wall of the atomizing chamber in areas prone to backflow. This mesh structure directly intercepts solidified particles in the backflow area, blocking their upward spiral path and preventing them from entering the mainstream area of ​​the atomizing cone and colliding with unsolidified droplets. Simultaneously, the solidified particles trapped by the mesh structure slide down the mesh surface to the collection area under gravity, preventing them from accumulating and being re-entrained into the airflow. This invention has a reasonable structure, providing a physical barrier that effectively prevents backflow particles from colliding with atomized droplets to form satellite powder, ensuring stable powder production quality. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0014] 1. Nozzle; 2. Droplet; 3. Protective cover body; 4. Fine powder. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0016] like Figure 1 As shown, a backflow prevention mesh gas protection cover for an atomization chamber includes a cover body 3. The cover body 3 is a conical porous mesh structure woven from high-temperature resistant metal wire, wherein the mesh density is 20-800 mesh, the wire diameter is 0.2-0.8 mm, and the opening rate is ≥60%.

[0017] The protective cover body 3 is installed on the side wall of the atomizing chamber in an area prone to backflow. In this embodiment, it is installed at the lower end of the nozzle 1 in the atomizing chamber. The conical angle of the protective cover body 3 matches the conical nozzle of the nozzle 1, and the upper end of the protective cover body 3 is in contact with the inner wall of the conical nozzle.

[0018] During operation, the mesh structure of the protective cover body 3 directly intercepts the solidified fine powder 4, blocking its swirling upward path and preventing it from entering the mainstream area of ​​the atomizing cone and colliding and adhering with the unsolidified droplets 2 to form satellite powder; the solidified fine powder 4 intercepted by the mesh structure slides down the mesh surface to the collection area under the action of gravity, avoiding accumulation and re-entry into the airflow.

[0019] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A backflow-prevention mesh gas protection cover for an atomization chamber, comprising a cover body, characterized in that: The main body of the protective cover is a high-temperature resistant conical porous mesh structure, and the main body of the protective cover is installed on the side wall of the atomization chamber in an area prone to backflow.

2. The anti-backflow mesh gas protective cover according to claim 1, characterized in that: The main body of the protective cover is woven from high-temperature resistant metal wire with a wire diameter of 0.2 to 0.8 mm.

3. The anti-backflow mesh gas protective cover according to claim 2, characterized in that: The mesh density of the main body of the protective cover is 20 to 800 meshes.

4. The anti-backflow mesh gas protective cover according to claim 3, characterized in that: The main body of the protective cover has an opening ratio of ≥60%.

5. The anti-backflow mesh gas protective cover according to any one of claims 1 to 4, characterized in that: The protective cover body is installed at the lower end of the nozzle, and its conical angle matches the conical nozzle orifice. The upper end of the protective cover body is in contact with the inner wall of the conical nozzle orifice.

Images