Nozzle structure capable of adjusting extension amount

Abstract

The utility model relates to a nozzle structure capable of adjusting the extension amount. The nozzle structure comprises a shell with an inner cavity; the through hole is formed in the bottom of the shell; the top of the shell extends downwards to the through hole to form the flow guide part, and an air outlet gap is formed between the top of the shell and the through hole; the air inlet is formed in the side wall of the shell and communicates with the inner cavity; the flow guide pipe penetrates through the flow guide part, an outlet of the flow guide pipe is located outside the shell, and the flow guide pipe is connected with the flow guide part through a thread pair; the distance between the outlet and the bottom of the shell is adjusted by rotating the flow guide pipe; due to the fact that the flow guide pipe and the flow guide part are connected through the threads, the vertical position can be adjusted relative to the flow guide part by rotating the flow guide pipe, namely the distance between the outlet in the bottom of the flow guide part and the bottom of the shell is adjustable, and the extension amount of the flow guide pipe is adjusted.

Description

Technical Field

[0001] The utility model relates to the field of metal powder atomization, in particular to a nozzle structure with adjustable extension amount. Background Art

[0002] Metal powder is an important raw material for thermal spraying, powder metallurgy, additive manufacturing, and other fields. Currently, the most widely used powder preparation method in industrial production is gas atomization. This method produces alloy powders with advantages such as high purity, good sphericity, and low oxygen content. The three most important parameters in gas atomization experiments are nozzle angle, nozzle extension, and atomization pressure.

[0003] During the experiment, the single gas phase flow field in the atomization process can be divided into three categories by adjusting these three sets of data: open tail flow, closed tail flow and tail-eliminating structure flow field. Discrete phase numerical simulation can analyze the mutual influence of airflow and melt, and analyze the atomization mechanism. The gas accelerates and breaks the melt, and the melt changes the airflow field structure. After adding particles, both the open tail flow and closed tail flow structures have open tail flow structures. The latter produces a smaller median particle size, while the tail-eliminating structure has an unsatisfactory flow field distribution after adding particles, and the suction pressure is positive, which is not conducive to atomization. In order to avoid the tail-eliminating structure flow field, the airflow injection top angle and the guide tube extension should be appropriately increased; with the change of the flow field structure, there are differences in the obtained metal powder particle size. The particle distribution and particle size under different nozzle parameters are studied, and it is found that with the increase of the airflow injection top angle and the guide tube extension, the powder particle size generally decreases first and then increases.

[0004] However, during the experiment, the extension of the guide tube cannot be directly adjusted, and the experiment can only be carried out by changing different guide tubes.

[0005] In summary, how to adjust the extension amount of the guide tube has become an urgent problem that researchers in this field need to solve. Utility Model Content

[0006] The technical problem to be solved by the utility model is: how to adjust the extension amount of the guide tube;

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] The utility model discloses a nozzle structure with adjustable extension amount, comprising: a shell having an inner cavity; a through hole, which is provided at the bottom of the shell; a flow guide portion, which is formed by extending downward from the top of the shell to the through hole and forming an air outlet gap between the flow guide portion and the through hole; an air inlet, which is provided on the side wall of the shell and communicates with the inner cavity; a flow guide pipe, which passes through the flow guide portion and has an outlet located outside the shell, and is connected to the flow guide portion via a threaded pair; the distance between the outlet and the bottom of the shell can be adjusted by rotating the flow guide pipe;

[0009] In this solution, high-pressure gas enters from the air inlet and is ejected from the air outlet gap. During this process, the molten metal fluid enters from the top inlet of the guide tube and is discharged from the bottom outlet of the guide tube. It comes into contact with the high-pressure gas ejected from the air outlet gap, impacting and crushing the metal fluid to form metal powder.

[0010] The outlet and the through hole are arranged concentrically to ensure that the ejected gas can evenly contact the metal fluid and ensure uniform crushing.

[0011] Since the guide tube is connected to the guide part by a thread, the guide tube can be adjusted up and down relative to the guide part by rotating it, that is, the distance between the bottom outlet of the guide part and the bottom of the shell can be adjusted, thereby achieving the adjustment of the extension of the guide tube;

[0012] By adjusting the extension amount of the guide tube to change the flow field structure and adopting a closed tail flow flow field structure, powder with a smaller particle size range can be obtained, and the back-spray phenomenon can be avoided.

[0013] In order to specifically describe the structure of the shell, the present invention adopts the shell comprising an upper end cover and a lower end cover; the upper end cover and the lower end cover are connected to form the inner cavity;

[0014] In this solution, a through hole is formed in the middle of the lower end cover, a flow guide portion is provided in the middle of the upper end cover extending downward, and an air inlet is provided at the side wall of the upper end cover.

[0015] How to achieve a threaded connection between the guide tube and the guide part? The utility model adopts the guide part having a mounting hole for the guide tube to pass through; a mounting groove, the guide part is provided with the mounting groove downwardly along the axis of the mounting hole, and the inner diameter of the mounting groove is larger than the inner diameter of the mounting hole; a fixing member is arranged in the mounting groove, and its inner hole has a first thread; a second thread is arranged on the outer wall of the guide tube and is engaged with the first thread;

[0016] In this solution, the middle part of the guide part has a mounting groove with a larger inner diameter and a mounting hole with a smaller inner diameter from top to bottom; the fixing piece is fixed in the mounting groove, the guide pipe passes through the mounting hole, and the guide pipe and the fixing piece are connected by a threaded pair.

[0017] In order to further reduce the pressure of the air outlet gap, the utility model adopts the through hole to form an inclined inner wall with a decreasing diameter from top to bottom;

[0018] Further compression of the gas is achieved through the inclined inner wall.

[0019] In order to limit the maximum extension of the guide tube, the utility model adopts a limit portion on the top outer wall of the guide tube;

[0020] The limiting portion rotates along with the guide tube. When the limiting portion rotates to abut against the fixing portion, the guide tube cannot continue to rotate. That is, the guide tube reaches its maximum extension at this time.

[0021] Beneficial effects of the utility model: The utility model is a nozzle structure with adjustable extension amount, which has the following advantages:

[0022] 1. Simplified equipment structure: easy to operate, no need to frequently disassemble the guide tube to replace different sizes of extension;

[0023] 2. The flow field structure can be changed by adjusting the extension amount of the guide tube, and a closed tail flow flow field structure can be adopted to obtain powder with a smaller particle size range and avoid the backspray phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 It is a cross-sectional view of the utility model;

[0026] Figure 2 yes Figure 1 A magnified view of point A;

[0027] Figure 3 It is an exploded view of the utility model;

[0028] Figure 4 Schematic diagram of the structure of the diversion part;

[0029] In the figure: 1-shell, 2-inner cavity, 3-through hole, 4-guide part, 5-air outlet gap, 6-air inlet, 7-guide pipe, 8-outlet, 9-mounting hole, 10-fixing part, 11-upper end cover, 12-lower end cover, 13-mounting groove, 14-inner wall, 15-limiting part. DETAILED DESCRIPTION

[0030] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0031] like Figure 1-4As shown, the utility model is a nozzle structure with adjustable extension, comprising: a shell 1 having an inner cavity 2; a through hole 3, which is opened at the bottom of the shell 1; a guide portion 4, which is formed by extending downward from the top of the shell 1 to the through hole 3, and forming an air outlet gap 5 between the guide portion 4 and the through hole 3; an air inlet 6, which is arranged on the side wall of the shell 1 and communicates with the inner cavity 2; a guide pipe 7, which passes through the guide portion 4 and has an outlet 8 located outside the shell 1, and is connected to the guide portion 4 by a threaded pair; by rotating the guide pipe 7, the distance between the outlet 8 and the bottom of the shell 1 can be adjusted;

[0032] In this embodiment, high-pressure gas enters from the gas inlet 6 and is ejected from the gas outlet gap 5. During this process, the molten metal fluid enters from the top inlet of the flow guide tube 7 and is discharged from the bottom outlet of the flow guide tube 7. It comes into contact with the high-pressure gas ejected from the gas outlet gap 5, impacting and crushing the metal fluid to form metal powder.

[0033] The outlet 8 is concentrically arranged with the through hole 3 to ensure that the ejected gas can evenly contact the metal fluid and ensure uniformity of metal crushing.

[0034] Since the guide tube 7 is connected to the guide part 4 by a thread, the guide tube 7 can be adjusted up and down relative to the guide part 4 by rotating it, that is, the distance between the outlet 8 at the bottom of the guide part 4 and the bottom of the shell 1 can be adjusted, thereby achieving the adjustment of the extension amount of the guide tube 7;

[0035] By adjusting the extension amount of the flow guide tube 7 to change the flow field structure, a closed tail flow flow field structure is adopted, thereby obtaining powder with a smaller particle size range and avoiding the back-spray phenomenon.

[0036] like Figure 3 As shown, in order to specifically illustrate the structure of the shell, the present invention adopts the shell 1 comprising an upper end cover 11 and a lower end cover 12; the upper end cover 11 and the lower end cover 12 are connected to form the inner cavity 2;

[0037] In this solution, a through hole 3 is formed in the middle of the lower end cover 12 , a guide portion 4 is provided in the middle of the upper end cover 11 extending downward, and an air inlet 6 is provided on the side wall of the upper end cover 11 .

[0038] like Figure 1 As shown, how to achieve the threaded connection between the guide tube and the guide part, the utility model adopts the guide part 4 having a mounting hole 9 for the guide tube 7 to pass through; a mounting groove 13, the guide part 4 is downwardly opened with the mounting groove 13 along the axis of the mounting hole 9, the inner diameter of the mounting groove 13 is larger than the inner diameter of the mounting hole 9; a fixing member 10 is arranged in the mounting groove 13, the inner hole of which has a first thread; a second thread is arranged on the outer wall of the guide tube 7, and is connected with the first thread;

[0039] In this solution, the middle part of the guide part 4 has a mounting groove with a larger inner diameter and a mounting hole 9 with a smaller inner diameter from top to bottom; the fixing part 10 is fixed in the mounting groove, the guide pipe 7 passes through the mounting hole 9, and the guide pipe 7 and the fixing part 10 are connected by a threaded pair.

[0040] like Figure 2 As shown, in order to further reduce the pressure of the air outlet gap, the utility model adopts the through hole 3 to form an inclined inner wall 14 with a decreasing diameter from top to bottom;

[0041] Further compression of the gas is achieved by the inclined inner wall 14 .

[0042] like Figure 3 As shown, in order to limit the maximum extension of the guide tube, the utility model adopts a limit portion 15 on the top outer wall of the guide tube 7;

[0043] The limiting portion 15 rotates along with the guide tube 7 . When the limiting portion 15 rotates to abut against the fixing portion 10 , the guide tube 7 cannot rotate further. That is, the guide tube 17 reaches its maximum extension at this moment.

[0044] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A nozzle structure with adjustable extension, characterized in that: include: a housing having an interior cavity; A through hole is provided at the bottom; A guide portion, the top of the shell extending downward to the through hole to form the guide portion, and forming an air outlet gap between the guide portion and the through hole; The air inlet is arranged on the side wall of the shell and communicates with the inner cavity; a flow guide pipe, which passes through the flow guide portion and has an outlet located outside the shell, and is connected to the flow guide portion via a threaded pair; The distance between the outlet and the bottom of the shell is adjusted by rotating the flow guide tube.

2. The nozzle structure with adjustable extension according to claim 1, characterized in that: The housing includes an upper end cover and a lower end cover; The upper end cover and the lower end cover are connected to form the inner cavity.

3. The nozzle structure with adjustable extension according to claim 1, characterized in that: The guide portion has a mounting hole for the guide pipe to pass through; A mounting groove is formed on the guide portion downwardly along the axis of the mounting hole, and the inner diameter of the mounting groove is larger than the inner diameter of the mounting hole; a fixing member, which is disposed in the mounting groove and has an inner hole having a first thread; A second thread is provided on the outer wall of the flow guide tube and is connected with the first thread in cooperation.

4. The nozzle structure with adjustable extension according to claim 1, characterized in that: The through hole forms an inclined inner wall with a decreasing diameter from top to bottom.

5. The nozzle structure with adjustable extension according to claim 1, characterized in that: The top outer wall of the flow guide tube is provided with a limiting portion.

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