A continuous ring-slit gas atomizing nozzle

Abstract

The application discloses a continuous ring-slit type gas atomizing nozzle, which comprises a gas inlet pipeline and a ring-slit type gas atomizing nozzle disc which are connected with each other, wherein the ring-slit type gas atomizing nozzle disc is provided with a metal melt flow channel, a gas pressurizing cavity and a ring-shaped slit which are located at the periphery of the metal melt flow channel; the gas inlet pipeline is communicated with the gas pressurizing cavity; and the outlet of the metal melt flow channel is communicated with the gas pressurizing cavity through the ring-shaped slit. The continuous slit gas outlet, the circumferential atomization, the good air flow convergence, the stronger breaking capacity, the continuous annular negative pressure area formed in the atomization process, the more stable metal melt adsorption, the 360-degree uniform liquid flow wrapping, the synchronous breaking and cooling, the higher sphericity, the less satellite powder and the better flowability are realized.

Description

Technical Field

[0001] This invention relates to the field of gas atomizing nozzle technology, and in particular to a continuous annular slit type gas atomizing nozzle. Background Technology

[0002] Gas atomization powdering utilizes a high-pressure, high-speed inert gas jet to impact molten metal flow, converting its kinetic energy into the surface energy of the molten metal, causing the molten metal flow to break into fine droplets. Subsequently, the droplets rapidly cool and solidify during flight, eventually forming spherical or near-spherical metal powder.

[0003] In the gas atomization powder production process, the atomizing spray disc is a core and critical component, and its structural design directly determines the airflow distribution, droplet breakup efficiency, and the quality of the final powder. The function of the spray disc is to convert high-pressure gas into a high-speed jet to shear and tear the molten metal; therefore, the structural form of the spray disc has a decisive influence on the atomization effect.

[0004] Currently, the most widely used type of atomizing spray disc in industry is the annular orifice type. This type of spray disc has multiple discrete jet holes along its circumference, through which high-pressure gas is ejected to form multiple independent gas jets. However, the annular orifice type spray disc has the following shortcomings in practical applications: 1) Airflow blind zones exist, resulting in uneven atomization: Due to the discrete distribution of the jet orifices, gaps exist between them. These gaps prevent the formation of an effective gas jet, causing certain local areas of the molten metal to be insufficiently sheared by the airflow. This "airflow blind zone" creates dead zones in the atomization process, preventing some molten metal from being effectively broken up and affecting the uniformity of powder particle size distribution.

[0005] 2) Severe airflow interference and energy dispersion: The independent jets ejected from each orifice interfere with and disperse after ejection, preventing the airflow energy from being effectively concentrated on the molten metal. This energy dispersion reduces atomization efficiency and increases energy consumption.

[0006] 3) Unstable negative pressure zone and poor suction effect: The discrete hole structure makes it difficult to form a continuous and stable negative pressure zone, and the adsorption and traction effect on the molten metal is unstable, which can easily cause fluctuations in the flow of the molten metal and affect the continuity of the atomization process.

[0007] 4) Poor powder quality: Affected by the above factors, the powder produced by the annular nozzle spray disc has problems such as poor sphericity, many satellite powders, and low fine powder yield, which makes it difficult to meet the demand for high-quality powders in high-end application fields.

[0008] Therefore, providing a continuous annular slit-type atomizing nozzle is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] In view of this, the present invention aims to provide a continuous annular slit-type air atomizing nozzle to solve problems such as airflow turbulence and instability of the negative pressure zone during atomization.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A continuous annular slit-type gas atomizing nozzle includes an inlet pipe and an annular slit-type gas atomizing spray disc connected together. The annular slit-type gas atomizing spray disc has a molten metal flow channel and a gas pressurizing chamber and an annular slit located around the molten metal flow channel. The inlet pipe is connected to the gas pressurizing chamber. The outlet of the molten metal flow channel is connected to the gas pressurizing chamber through the annular slit.

[0011] Furthermore, the width of the annular gap is 1.0mm-3.0mm.

[0012] Furthermore, the angle between the injection direction of the annular slit and the axis of the molten metal flow channel is 15°-40°.

[0013] Furthermore, a guide pipe is installed inside the molten metal flow channel.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a continuous annular slit-type atomizing nozzle, which has the following beneficial effects: 1) Good airflow continuity, uniform atomization without dead zones This invention employs a ring-shaped slit-type air outlet structure (annular gap), with the air outlet being a continuous slit around the entire circle, rather than the discrete small holes of a traditional annular nozzle. High-pressure gas is continuously ejected from the annular gap, forming an uninterrupted airflow curtain in the circumferential direction, enabling 360° all-around envelopment of the molten metal. Compared with existing technologies, this invention completely eliminates the airflow blind zones existing between discrete small holes, ensuring that every area of ​​the molten metal is effectively sheared by the high-speed airflow, resulting in a more uniform atomization process and avoiding the problem of insufficient local atomization.

[0015] 2) Good airflow convergence and stronger breaking ability The annular slit structure of this invention enables the ejected gas to form a continuous and dense annular jet, with the airflows in all directions reinforcing each other rather than interfering with each other, resulting in more concentrated energy. Compared to the energy dispersion caused by the divergence and mutual interference of discrete hole structures, this invention can efficiently concentrate the gas kinetic energy onto the molten metal, resulting in stronger shearing and tearing effects, significantly improved atomization efficiency, and thus better yield of fine powder.

[0016] 3) The negative pressure zone is continuous and stable, resulting in excellent suction performance. This invention creates a continuous annular negative pressure zone during atomization, which is uniformly distributed and stable along the circumference. This characteristic makes the adsorption and traction of molten metal more stable, effectively suppressing fluctuations and instabilities in the molten metal flow. Compared with the discontinuous and unstable negative pressure zones formed by discrete pore structures in existing technologies, this invention ensures that molten metal can continuously and stably enter the atomization zone, which is beneficial for continuous production.

[0017] 4) Good gas-liquid contact and encapsulation properties, resulting in high powder quality. In this invention, the high-speed airflow ejected from the annular slit can simultaneously and uniformly envelop the molten metal from all sides, achieving rapid cooling while shearing and breaking it up. This simultaneous breaking and cooling mechanism allows the droplets sufficient time to form a spherical shape under surface tension before solidification. Compared with existing technologies, the metal powder produced using this invention has higher sphericity, significantly reduced satellite powder (fine particles adhering to the surface of larger particles), and better powder flowability, meeting the powder quality requirements of high-end applications such as 3D printing and powder metallurgy.

[0018] 5) Simple structure, easy operation, and strong adaptability The continuous annular slit atomizing nozzle of this invention has a simple overall structure with no complex internal components, making it easy to manufacture, install, and maintain. By replacing the spray disc with different annular slit widths or different spray angles, or by replacing the guide tube with different inner diameters, it can adapt to the preparation needs of different metal materials and different powder particle size ranges, exhibiting good process adaptability and facilitating continuous industrial production. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a continuous annular slit-type atomizing nozzle provided by the present invention.

[0021] Figure 2 This is a cross-sectional view of a continuous circumferential slit atomizing nozzle provided by the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] See Figures 1-2 This invention discloses a continuous annular slit-type atomizing nozzle, comprising an inlet pipe 1 and an annular slit-type atomizing spray disc 2 connected to each other. The annular slit-type atomizing spray disc 2 has a molten metal flow channel 21, a gas pressurizing chamber 22 located around the molten metal flow channel 21, and an annular slit 23. A guide pipe is installed inside the molten metal flow channel 21. In this embodiment, the molten metal flow channel 21 is located in the middle of the annular slit-type atomizing spray disc 2 and is axially distributed. The outlet of the molten metal flow channel 21 is outwardly expanded, and the cross-section of the outlet is an isosceles trapezoidal shape. The gas pressurizing chamber 22 is an annular cavity located at intervals outside the molten metal flow channel 21. The annular slit 23 is a continuous narrow slit in a concentric annular shape with a cylindrical cross-section. The inlet pipe 1 is connected to the gas pressurizing chamber 22. The outlet of the molten metal flow channel 21 is connected to the gas pressurizing chamber 22 through the annular slit 23. This invention features continuous slit air outlet, circumferential atomization without dead angles, good airflow convergence, and stronger crushing ability. During the atomization process, a continuous annular negative pressure zone is formed, resulting in more stable adsorption of molten metal. The liquid flow is uniformly wrapped in 360°, and the liquid is simultaneously crushed and cooled, resulting in higher sphericity, fewer satellite powders, and better fluidity.

[0024] Specifically, the width of the annular slit 23 is 1.0 mm to 3.0 mm; the angle between the injection direction of the annular slit 23 and the axis of the molten metal flow channel 21 is 15° to 40°, in order to adapt to the needs of preparing different powder particle sizes.

[0025] The working process of this invention is as follows: The annular slit-type gas atomizing spray plate 2 is installed on the gas atomizing equipment, and a guide pipe is installed in the molten metal flow channel 21. When atomization begins, high-pressure gas enters the annular slit-type gas atomizing spray plate 2 from the air inlet pipe 1. After passing through the gas pressurization chamber 22, it is sprayed out from the annular slit 23 to break up the molten metal flowing out of the molten metal flow channel 21. Subsequently, the broken droplets are cooled in the atomizing barrel and solidified into powder.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0029] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A continuous annular slit-type atomizing nozzle, comprising a connected air inlet pipe and an annular slit-type atomizing spray disc, characterized in that, The annular slit-type atomizing spray disc has a molten metal flow channel and a gas pressurization chamber and annular slit located around the molten metal flow channel. The air inlet pipe is connected to the gas pressurization chamber. The outlet of the molten metal flow channel is connected to the gas pressurization chamber through the annular slit.

2. The continuous annular slit-type atomizing nozzle according to claim 1, characterized in that: The width of the annular gap is 1.0mm-3.0mm.

3. A continuous annular slit-type gas atomizing nozzle according to claim 1 or 2, characterized in that: The angle between the injection direction of the annular slit and the axis of the molten metal flow channel is 15°-40°.

4. A continuous annular slit-type atomizing nozzle according to claim 1, characterized in that: A guide pipe is installed inside the molten metal flow channel.

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