CN109249032B

CN109249032B - Atomized powder-making catheter

Info

Publication number: CN109249032B
Application number: CN201811409619.2A
Authority: CN
Inventors: 刘小欣; 樊恩想; 廖文俊; 付超; 苏青
Original assignee: Shanghai Electric Group Corp
Current assignee: Shanghai Electric Group Corp
Priority date: 2018-11-23
Filing date: 2018-11-23
Publication date: 2022-01-21
Anticipated expiration: 2038-11-23
Also published as: CN109249032A

Abstract

The invention discloses an atomized powder making catheter which comprises a catheter body, wherein a groove is formed in the outer peripheral surface of the catheter body, the groove is inwards sunken along the radial direction of the catheter body, the catheter body is used for penetrating through a nozzle, and a gap is formed between the catheter body and the nozzle through the groove. According to the atomized powder making catheter, the groove is used for isolating the gap between the catheter body and the nozzle, so that the heat loss of a melt when the melt passes through the catheter body is greatly reduced, the superheat degree of the melt is ensured, the problem of blockage of the atomized powder making catheter is effectively solved, and the quality and the production efficiency of fine powder are improved.

Description

Atomized powder-making catheter

Technical Field

The invention relates to the technical field of atomized powder preparation, in particular to an atomized powder preparation catheter.

Background

The additive manufacturing technology is known as the third industrial revolution, wherein metal additive manufacturing is one of the important ways for realizing industrial application of the additive manufacturing technology, and metal powder serving as a raw material is the key point of technical development. The metal powder required by additive manufacturing should have the characteristics of high sphericity, small powder particle size, good fluidity, high purity of chemical components and the like. This places extremely high demands on the metal powder preparation equipment required for additive manufacturing.

At present, the main technical route for preparing metal powder raw materials for additive manufacturing is a vacuum atomization mode, wherein high-speed inert gas is adopted to break a metal melt liquid flow into fine liquid drops, and the liquid drops are solidified to form metal powder. In the gas atomization process, except for the gas atomization nozzle, the metal melt liquid guide pipe plays a key role, and the production efficiency and the powder quality are directly influenced. The existing metal melt catheter for gas atomization powder preparation has the following defects:

as disclosed in patent publication No. CN203610671U, in order to pursue high fine powder yield, the flow rate of the metal melt is smaller, and the fine powder yield theory is higher, but too low flow rate of the metal melt may cause the metal melt to solidify and block the pipe, and the melt is likely to solidify at the flow guide pipe, causing pipe blockage, and affecting the process of milling.

As disclosed in CN107999312A, in the close-coupled atomizer, the outlet end of the liquid guiding tube directly contacts with the atomizing gas flowing at high speed, which rapidly lowers the temperature of the outer wall of the liquid guiding tube, and the liquid guiding tube is solidified by the heat conducted to the melt, resulting in the blockage of the liquid guiding tube.

As described in patent publication No. CN2587553Y, the catheter sheath is assembled with the catheter, increasing the complexity and manufacturing cost of the device; when the metal melt flows out of the outlet of the liquid guide pipe, the metal melt is broken into small liquid drops under the action of high-flow-rate gas, and some liquid drops can be adhered to the outer sleeve of the flow guide pipe contacted with the liquid guide pipe, so that the atomization effect is influenced, even the outer sleeve of the flow guide pipe is scrapped, and the manufacturing cost is increased.

Under the prior art, the vacuum atomization catheter mainly has the following defects:

in the pursuit of higher fine powder yields, it is common practice to reduce the inner diameter of the catheter and increase the velocity of the atomizing gas, with reducing the inner diameter of the catheter being easier to achieve than increasing the velocity of the atomizing gas. However, when metal flows through a relatively thin catheter, it is easily solidified to cause clogging of the catheter. After the liquid guide pipe is blocked, all the metal melt which is not discharged in the crucible can be treated as waste.

According to the metallurgical principle, the melt which is required to be acted with gas for preparing metal powder by gas atomization has a certain superheat degree, and the melt has lower viscosity and is more beneficial to crushing and atomization. During the flow of the melt in the catheter, the temperature of the melt decreases as the flow distance in the catheter increases. Too little superheat of the melt will not only affect the quality of the powder produced and the particle size of the powder but may also clog the tube.

When the metal melt flows out of the outlet of the liquid guide pipe, the metal melt is broken into small liquid drops under the action of high-flow-rate gas, and some liquid drops can be adhered to the outer sleeve of the flow guide pipe contacted with the liquid guide pipe, so that the atomization effect is influenced, even the outer sleeve of the flow guide pipe is scrapped, and the manufacturing cost is increased.

Disclosure of Invention

The invention aims to solve the technical problem of providing an atomized powder-making catheter in order to overcome the defects that the existing catheter is easy to solidify, the melt is insufficient in superheat degree, the catheter is blocked and the like.

The invention solves the technical problems through the following technical scheme:

the atomization powder making catheter is characterized by comprising a catheter body, wherein a groove is formed in the outer peripheral surface of the catheter body, the groove is inwards sunken along the radial direction of the catheter body, the catheter body is used for penetrating through a nozzle, and a gap is formed between the catheter body and the nozzle through the groove.

In this scheme, adopt above-mentioned structural style, make gap isolation between pipe body and the nozzle through the recess, this internal fuse-element of geminate transistors plays good heat preservation, thermal-insulated effect, greatly reduced the heat loss of fuse-element when passing through the pipe body, guaranteed the fuse-element superheat degree for the fuse-element can not produce and solidify, has effectively solved the jam problem of atomizing powder process catheter. Meanwhile, the failure rate of the tube body in the vacuum gas atomization powder preparation process is reduced, and the quality and the production efficiency of fine powder are improved.

Preferably, the bottom of the pipe body is provided with a chamfer, the chamfer is exposed out of the lower surface of the nozzle, and the outer surface of the chamfer and the lower surface of the nozzle are positioned on the same plane.

In this scheme, adopt above-mentioned structural style, the chamfer through stretching out the catheter of nozzle lower surface is used for bearing the flow of high-speed low temperature gas, can effectively avoid the fuse-element to splash to the nozzle for the fuse-element can not glue on the nozzle and lead to scrapping of nozzle. Meanwhile, the pipe body can be conveniently inserted into the nozzle through the chamfer.

Preferably, the angle between the outer surface of the chamfer and the radial direction of the pipe body is 45-75 degrees.

Preferably, the outer circumferential surface of the pipe body is provided with a positioning portion, the positioning portion is located above the groove, the positioning portion extends outwards along the radial direction of the pipe body and protrudes, and the bottom surface of the positioning portion is used for abutting against the top of the nozzle.

In this scheme, adopt above-mentioned structural style, location portion plays the positioning action, realizes the accurate installation between atomizing powder process catheter and the nozzle.

Preferably, the bottom surface of the positioning portion and the upper side surface of the groove are located on the same plane.

In this scheme, adopt above-mentioned structural style, be convenient for process preparation location portion, and effectively reduced the area of contact between pipe body and the nozzle, avoided the heat of fuse-element to scatter and disappear.

Preferably, the bottom of the pipe body has a contact portion located below the groove, the contact portion extending in a radial direction of the pipe body to be convex, and the bottom of the contact portion has an annular groove recessed upward in an axial direction of the pipe body.

In this scheme, adopt above-mentioned structural style, the annular groove has thermal-insulated effect, has avoided the heat of fuse-element to scatter and disappear, has guaranteed the superheat degree of fuse-element, has effectively avoided the bottom of pipe body to produce the solidification phenomenon.

Preferably, the groove depth of the groove is 0.5-1mm, and the groove width of the annular groove is 0.4-0.8 mm.

Preferably, the pipe body is made by integral molding.

In this scheme, adopt above-mentioned structural style, the structure of pipe body is convenient for in time change through the integrated design, reduces manufacturing cost.

Preferably, the tube body extends beyond the lower surface of the nozzle by a distance of 3-5 mm.

Preferably, the material of the pipe body is ceramic.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The positive progress effects of the invention are as follows:

according to the atomized powder making catheter, the groove is used for isolating the gap between the catheter body and the nozzle, so that the heat loss of a melt when the melt passes through the catheter body is greatly reduced, the superheat degree of the melt is ensured, the problem of blockage of the atomized powder making catheter is effectively solved, and the quality and the production efficiency of fine powder are improved.

Drawings

Fig. 1 is a schematic view of a usage state of an atomized powder catheter according to an embodiment of the present invention.

Fig. 2 is a schematic sectional view along a-a of fig. 1.

Fig. 3 is a schematic view of the internal structure of the atomized powder catheter according to the embodiment of the invention.

FIG. 4 is a schematic diagram of the relationship between an atomized powder catheter and a conventional catheter according to an embodiment of the present invention.

Description of reference numerals:

atomized powder catheter 10

Pipe body 1

Groove 11

Chamfer 12

Positioning part 13

Contact part 14

Annular groove 15

Nozzle 20

Included angle alpha

Detailed Description

The present invention will be more clearly and completely described below by way of examples and with reference to the accompanying drawings, but the present invention is not limited thereto.

As shown in fig. 1, 2 and 3, an atomized powder delivery catheter 10 according to an embodiment of the present invention includes a tube body 1, the tube body 1 has a groove 11 on an outer circumferential surface thereof, the groove 11 is recessed inward in a radial direction of the tube body 1, the tube body 1 is configured to pass through a nozzle 20, and the tube body 1 has a gap with the nozzle 20 through the groove 11. Make through recess 11 and keep apart in the gap between pipe body 1 and the nozzle 20, pipe body 1 designs into hollow structure in the position that bears low temperature gas, plays good heat preservation, thermal-insulated effect to the fuse-element in the pipe body 1, greatly reduced the heat loss of fuse-element when passing through pipe body 1, guaranteed the fuse-element superheat degree for the fuse-element can not produce and solidify, has effectively solved the jam problem of atomizing powder process catheter 10. Meanwhile, the failure rate of the tube body 1 in the vacuum gas atomization powder preparation process is reduced, and the quality and the production efficiency of fine powder are improved.

The material of the tube body 1 may be ceramic. This ceramic material is like aluminium oxide (Al2O3), magnesium oxide (MgO), graphite (C), zirconia (ZrO2) and Boron Nitride (BN) etc. in the use of atomizing powder process catheter 10, can be full of atomizing gas and be formed with the gas film in the recess 11, and the coefficient of heat conductivity of this gas film is 3-4 orders of magnitude less than ceramic material's coefficient of heat conductivity to can effectually hinder the thermal dissipation of fuse-element, play the thermal-insulated effect of keeping warm.

Wherein, the length of the tube body 1 is 88-94mm, the depth of the groove 11 can be 0.5-1mm, so that a gap of at least 0.5-1mm is formed between the tube body 1 and the nozzle 20.

The bottom of the pipe body 1 may have a chamfer 12, the chamfer 12 is exposed to the lower surface of the nozzle 20, and the outer surface of the chamfer 12 and the lower surface of the nozzle 20 are located on the same plane. The bottom of the pipe body 1 extends out of the nozzle 20, the bottom of the nozzle 20 is provided with an inclined part, the chamfer 12 extends out of the inclined part, the outer surface of the chamfer 12 and the bottom surface of the inclined part are in smooth transition, and the outer surface of the chamfer 12 and the bottom surface of the inclined part are positioned on the same plane. The fuse-element in the pipe body 1 is high-speed spout and with outside low temperature atomizing gas direct contact, is used for bearing the flow of high-speed low temperature gas through chamfer 12, can effectively avoid the fuse-element to splash to nozzle 20 on for the fuse-element can not glue on nozzle 20 and lead to scrapping of nozzle 20. At the same time, the insertion of the pipe body 1 into the nozzle 20 is also facilitated by the chamfer 12. Preferably, the bottom of the pipe body 1 is inserted into the nozzle 20 with a gap with the nozzle 20, avoiding the melt from solidifying in contact with the nozzle 20. The angle alpha between the outer surface of the chamfer 12 and the radial direction of the pipe body 1 is 45-75 degrees.

The pipe body 1 may be formed by integral molding. The structure of the pipe body 1 is integrally designed, so that the pipe body is convenient to replace in time, and the manufacturing cost can be reduced. Preferably, the distance that the pipe body 1 extends beyond the lower surface of the nozzle 20 is 3 to 5mm, so as to avoid the melt from adhering to the nozzle 20 and causing the nozzle 20 to fail.

The outer circumferential surface of the pipe body 1 may be provided with a positioning portion 13, the positioning portion 13 is located above the groove 11, the positioning portion 13 extends outward along the radial direction of the pipe body 1, and the bottom surface of the positioning portion 13 is used for abutting against the top of the nozzle 20. The pipe body 1 is inserted into the nozzle 20 from top to bottom, the positioning part 13 plays a positioning role, and the positioning part 13 abuts against the top of the nozzle 20, so that the outer surface of the chamfer 12 and the lower surface of the nozzle 20 are positioned on the same plane, and the precise installation between the atomized powder making liquid guide pipe 10 and the nozzle 20 is realized.

The bottom surface of the positioning portion 13 and the upper side surface of the groove 11 are located on the same plane. The upper side face of the groove 11 refers to a side face, far away from the chamfer 12, in the inner wall face of the groove 11, the lower side face of the groove 11 refers to a side face, close to the chamfer 12, in the inner wall face of the groove 11, the bottom face of the positioning part 13 and the upper side face of the groove 11 are located on the same plane, the positioning part 13 is convenient to process and manufacture, the contact area between the pipe body 1 and the nozzle 20 is effectively reduced, and heat loss of a melt is avoided. The width of the bottom surface of the positioning part 13 can be 8-14mm, and a step is formed between the positioning part 13 and the groove 11 and used for positioning, so that the positioning part 13 is matched with the nozzle 20 through the step.

The bottom of the pipe body 1 may have a contact portion 14, the contact portion 14 being located below the groove 11, the contact portion 14 extending in a radial direction of the pipe body 1 to be convex, the bottom of the contact portion 14 having an annular groove 15, the annular groove 15 being concave upward in an axial direction of the pipe body 1. The tube body 1 is inserted into the nozzle 20 from top to bottom, the chamfer 12 is positioned at one side of the bottom of the contact part 14, the contact part 14 is abutted against the inner wall surface of the nozzle 20 in the use process of the tube body 1, and the heat of the melt is conducted and dissipated through the contact part 14. The contact part 14 is made to have a hollow structure through the annular groove 15, the annular groove 15 has a heat insulation effect, heat loss of the melt is avoided, the superheat degree of the melt is guaranteed, and the solidification phenomenon at the bottom of the pipe body 1 is effectively avoided.

Wherein, the groove width of the annular groove 15 is 0.4-0.8mm, and the groove depth of the annular groove 15 is 3-5mm, of course, the groove depth of the annular groove 15 can be designed according to the height of the contact part 14.

The atomized powder catheter 10 of the present embodiment and the existing catheter are used for atomized powder, the temperatures of the two catheters at the outlet positions are measured, the temperature of the outlet position at the lowest end of the catheter is measured, and the measurement result data is shown in fig. 4, wherein S1 is the atomized powder catheter 10 of the present embodiment, S2 is the existing catheter, 0.0 position in the abscissa represents the intersection position between the outlet position and the center line of the catheter, and the melt temperature at the inlet end in the catheter is very close to the temperature of 0.0 position in the abscissa. The measured data prove that the melt temperature at the outlet end of the conventional catheter is lower than that at the inlet end by about 110K, while the melt temperature at the outlet end of the atomized powder catheter 10 of the embodiment is lower than that at the inlet end by about 20K. Therefore, the atomization powder-making catheter 10 of the embodiment of the invention greatly reduces the heat loss of the melt when the melt passes through the tube body 1, ensures the superheat degree of the melt, effectively solves the problem of blockage of the atomization powder-making catheter 10, and improves the quality and the production efficiency of fine powder.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. The atomized powder making catheter is characterized by comprising a tube body, wherein a groove is formed in the outer peripheral surface of the tube body, the groove is inwards recessed along the radial direction of the tube body, the tube body is used for penetrating through a nozzle, a gap is formed between the tube body and the nozzle through the groove, a contact part is arranged at the bottom of the tube body and is positioned below the groove, the contact part extends and protrudes along the radial direction of the tube body, an annular groove is formed in the bottom of the contact part, and the annular groove is upwards recessed along the axial direction of the tube body;

the bottom of the pipe body is provided with a chamfer, the chamfer is exposed out of the lower surface of the nozzle, and the outer surface of the chamfer and the lower surface of the nozzle are positioned on the same plane;

the included angle between the outer surface of the chamfer and the radial direction of the pipe body is 45-75 degrees;

the groove depth of the groove is 0.5-1mm, and the groove width of the annular groove is 0.4-0.8 mm;

the distance of the pipe body extending out of the lower surface of the nozzle is 3-5 mm.

2. The atomized powder delivery tube of claim 1, wherein the tube body has a positioning portion on the outer peripheral surface thereof, the positioning portion is located above the groove, the positioning portion extends outward in the radial direction of the tube body, and the bottom surface of the positioning portion is used for abutting against the top of the nozzle.

3. The aerosol pulverization catheter of claim 2, wherein the bottom surface of the positioning portion and the upper side surface of the groove are located on the same plane.

4. The atomized powder catheter of claim 1, wherein the tube body is integrally formed.

5. The atomized powder catheter of claim 1, wherein the tube body is made of ceramic.