Gas atomization adjustable nozzle for preparing active metal powder

Abstract

The invention provides a gas atomization adjustable nozzle for preparing active metal powder. The gas atomization adjustable nozzle comprises an outer nozzle and an inner discharge spout, the outer nozzle is internally provided with an annular gas storage chamber, an upper channel and a lower channel which are arranged on the inner side of the gas storage chamber, are coaxial and are communicated, and an annular gas outlet which is arranged between the upper channel and the lower channel and is communicated with the gas storage chamber; and an air inlet communicated with the air storage chamber is formed in the outer wall of the outer nozzle. The inner discharge spout is made of heat preservation materials, a flow channel is formed in the inner discharge spout, the inner discharge spout is installed in the upper channel, and the distance between the inner discharge spout and the annular air outlet is adjustable. The distance between the inner discharge spout and the annular air outlet can be adjusted to the optimal position according to the property of molten metal, so that it is guaranteed that good uniformity can be kept when metal powder made of different materials is manufactured.

Description

Technical Field

[0001] The invention relates to the technical field of metal powder production, in particular to an adjustable atomization nozzle for preparing active metal powder. Background Art

[0002] Metal powder atomization refers to the process of using high-speed airflow to break up the molten metal flow to form fine droplets, which solidify into powder particles during cooling. Gas atomization (GA) is one of the main methods for preparing spherical metal powder for 3D printing. The metal powder prepared by GA has the characteristics of small particle size, uniform composition, high sphericity and good fluidity, and has been put into large-scale production.

[0003] An atomizing nozzle is a device that uses high-speed airflow to break up the molten metal flow into tiny droplets. There are many types of metal powders, including aluminum powder, copper powder, steel powder, and non-oxidizable metal or alloy powders such as copper, nickel, and cobalt. Metal droplets of different materials are affected by their viscosity and fluidity, which makes the time required for the metal liquid to drip and become fully shaped droplets different, and then the required distance length is different. In the existing atomizing nozzle structure, the distance between the metal droplet discharge end and the airflow outlet is fixed, which may cause the metal droplets to be broken up by the airflow before they become complete droplets, which causes uneven force on the droplets, and then affects the uniformity of the metal particles. Summary of the invention

[0004] In order to solve the technical problems existing in the background technology, the present invention proposes an adjustable atomization nozzle for preparing active metal powder.

[0005] The invention provides an adjustable atomization nozzle for preparing active metal powder, comprising: an outer nozzle and an inner leakage nozzle;

[0006] The outer nozzle has an annular air storage chamber, an upper channel and a lower channel arranged inside the air storage chamber and connected to each other coaxially, and an annular air outlet arranged between the upper channel and the lower channel and connected to the air storage chamber; the outer wall of the outer nozzle is provided with an air inlet connected to the air storage chamber;

[0007] The inner leakage nozzle is made of a heat-insulating material, has a flow channel inside, is installed in the upper channel, and the distance between the inner leakage nozzle and the annular air outlet is adjustable.

[0008] Preferably, the inner leakage nozzle is threadably assembled with the upper channel.

[0009] Preferably, an internal threaded tube embedded in the inner wall of the upper channel is provided on the inner side, and an external threaded tube is mounted on the inner leakage nozzle. The inner leakage nozzle forms a threaded assembly with the upper channel through the external threaded tube mounted on the outside and the internal threaded tube embedded in the inner wall of the upper channel.

[0010] Preferably, a heat insulating layer is provided between the inner leakage nozzle and the outer threaded tube.

[0011] Preferably, an electric heating element is provided between the inner and outer walls of the inner leakage nozzle.

[0012] Preferably, a sealing ring is provided at the end of the inner leakage nozzle close to one end of the annular air outlet.

[0013] Preferably, the lower channel is a flared channel.

[0014] In the present invention, the inner leakage nozzle is set as a heat preservation structure, and the distance between the inner leakage nozzle and the annular air outlet is adjustable. By adjusting the distance between the inner leakage nozzle and the annular air outlet, it is ensured that the molten metal has enough distance to form a regular droplet state after dripping from the inner leakage nozzle, and at the same time, the metal droplets will not be cooled due to excessive distance. The structural design of the nozzle can adjust the distance between the inner leakage nozzle and the annular air outlet to the optimal position according to the properties of the molten metal, so as to ensure that the metal powders of different materials can maintain good uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of an adjustable atomization nozzle for preparing active metal powders proposed by the present invention;

[0016] Figure 2 The present invention provides a schematic diagram of the air flow ejection in an adjustable atomization nozzle for preparing active metal powder. DETAILED DESCRIPTION

[0017] Reference Figure 1-2 The present invention provides an adjustable atomization nozzle for preparing active metal powder, comprising: an outer nozzle 1 and an inner leakage nozzle 2;

[0018] The outer nozzle 1 has an annular air storage chamber 1a, an upper channel 1b and a lower channel 1c arranged inside the air storage chamber 1a and coaxially connected, and an annular air outlet 1d arranged between the upper channel 1b and the lower channel 1c and connected to the air storage chamber 1a. The outer wall of the outer nozzle 1 is provided with an air inlet connected to the air storage chamber 1a. The inner leakage nozzle 2 is made of a heat-insulating material, and has a flow channel inside. The inner leakage nozzle 2 is installed in the upper channel 1b, and the distance between the inner leakage nozzle 2 and the annular air outlet 1d is adjustable, specifically: the inner leakage nozzle 2 is threadedly assembled with the upper channel 1b, and the distance between the inner leakage nozzle 2 and the annular air outlet 1d can be adjusted by rotating the outer nozzle 1 or the inner leakage nozzle 2. By adjusting the distance between the inner leakage nozzle 2 and the annular air outlet 1d, it is ensured that the molten metal has a sufficient distance to form a regular droplet state after dripping from the inner leakage nozzle 2, while at the same time, the metal droplets will not be cooled due to excessive distance, thereby ensuring that the metal droplets are evenly stressed at the moment of contact with the air flow blown out of the annular air outlet 1d, thereby ensuring the uniformity of the particle size of the produced metal powder.

[0019] Furthermore, an internal threaded tube 3 embedded in the inner wall of the upper channel 1b is provided on the inner side, and an external threaded tube 4 is mounted on the inner leakage nozzle 2. The inner leakage nozzle 2 is threadedly assembled with the upper channel 1b through the external threaded tube 4 mounted on the outside and the internal threaded tube 3 embedded in the inner wall of the upper channel 1b. This structural design solves the problem that the inner leakage nozzle 2 is difficult to be threaded due to its material.

[0020] In addition, a heat insulating layer may be provided between the inner leakage nozzle 2 and the outer threaded tube 4 to prevent high temperature from affecting the screwing in and out of the outer threaded tube 4 .

[0021] A sealing ring 5 is provided at the end of the inner leakage nozzle 2 close to the annular air outlet 1d.

[0022] The lower channel 1c is an expanded channel to facilitate the metal liquid dispersed by the airflow to be better dispersed around.

[0023] Furthermore, an electric heating element is provided between the inner and outer walls of the inner leakage nozzle 2, so as to utilize the electric heating element to ensure that the temperature in the flow channel can always reach the optimal flow temperature of the molten metal.

[0024] As can be seen from the above, the present invention sets the inner leakage nozzle 2 into a heat preservation structure, and makes the distance between the inner leakage nozzle 2 and the annular air outlet 1d adjustable. By adjusting the distance between the inner leakage nozzle 2 and the annular air outlet 1d, it is ensured that the molten metal has enough distance to form a regular droplet state after dripping from the inner leakage nozzle 2, and at the same time, the metal droplets will not be cooled due to excessive distance. The structural design of the nozzle can adjust the distance between the inner leakage nozzle 2 and the annular air outlet 1d to the optimal position according to the properties of the molten metal, so as to ensure that the metal powders of different materials can maintain good uniformity.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An adjustable atomizing nozzle for preparing active metal powder, characterized in that: include: An outer nozzle (1) and an inner leakage nozzle (2); The outer nozzle (1) has an annular air storage chamber (1a) inside, an upper channel (1b) and a lower channel (1c) arranged inside the air storage chamber (1a) and coaxially connected, and an annular air outlet (1d) arranged between the upper channel (1b) and the lower channel (1c) and connected to the air storage chamber (1a); an air inlet connected to the air storage chamber (1a) is provided on the outer wall of the outer nozzle (1); The inner leakage nozzle (2) is made of a heat-insulating material and has a flow channel inside. The inner leakage nozzle (2) is installed in the upper channel (1b), and the distance between the inner leakage nozzle (2) and the annular air outlet (1d) is adjustable.

2. The adjustable atomization nozzle for preparing active metal powder according to claim 1, characterized in that: The inner leakage nozzle (2) is threadedly assembled with the upper channel (1b).

3. The adjustable atomization nozzle for preparing active metal powder according to claim 2, characterized in that: An internal threaded tube (3) embedded in the inner wall of the upper channel (1b) is provided on the inner side, and an external threaded tube (4) is sleeved on the inner leakage nozzle (2). The inner leakage nozzle (2) is threadedly assembled with the upper channel (1b) through the external threaded tube (4) sleeved on the outer side and the internal threaded tube (3) embedded in the inner wall of the upper channel (1b).

4. The adjustable atomization nozzle for preparing active metal powder according to claim 1, characterized in that: A heat insulation layer is provided between the inner leakage nozzle (2) and the outer threaded pipe (4).

5. The adjustable atomization nozzle for preparing active metal powder according to claim 1, characterized in that: An electric heating element is provided between the inner and outer walls of the inner leakage nozzle (2).

6. The adjustable atomization nozzle for preparing active metal powder according to claim 1, characterized in that: A sealing ring (5) is provided at the end of the inner leakage nozzle (2) close to one end of the annular air outlet (1d).

7. An adjustable atomization nozzle for preparing active metal powder according to any one of claims 1 to 6, characterized in that: The lower channel (1c) is a flared channel.

Images