Split type atomizing disc

Abstract

The utility model relates to a split type atomizing disc which comprises a spraying disc and a nozzle, a melt channel and an atomizing chamber are sequentially arranged in the nozzle from top to bottom in the axis direction of the nozzle, the nozzle is coaxially installed in a central hole of the spraying disc, an air flow cavity is formed between the nozzle and the spraying disc, and a plurality of inclined holes used for connecting the atomizing chamber and the air flow cavity are formed in the nozzle. An airflow channel communicated with the airflow cavity is formed in the spraying disc in the radial direction of the spraying disc, and an air inlet is connected to the end, close to the edge of the spraying disc, of the airflow channel. Through the structural design of the split type atomizing disc, the nozzle or the spraying disc is convenient to replace, meanwhile, the inclined holes distributed in the circumferential direction are independently formed in the nozzle, the machining difficulty is reduced, and the machining cost is saved. Through the airflow channel, the airflow cavity and the inclined holes, the gas atomization jet velocity is increased, high gas impact force and high cooling speed are obtained, the sphericity degree of powder is greatly improved, and the content of satellite balls is remarkably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gas atomization powder making, in particular to a split atomization disc. Background Art

[0002] The gas atomization method for preparing powders is to use the impact force of gas to act on the molten liquid flow, so that the kinetic energy of the gas is converted into the surface energy of the melt, thereby forming fine droplets and solidifying into powder particles. There are two types of nozzles commonly used at present: one is the free fall nozzle, which has a simple design, is not easy to block the nozzle, and the control process is relatively simple, but it is not suitable for the production of ferrous metals with higher melting points, and the atomization efficiency is not high; the other is the restricted nozzle, which has a compact structure, significantly shortens the flight distance of the gas, and significantly improves the atomization efficiency, but the design is complex, and there are problems such as difficult process control, easy to block the nozzle, and high cost.

[0003] Chinese patent CN200620039329.X discloses a ring-hole supersonic gas atomizing nozzle, which consists of a nozzle core and a nozzle sleeve. The nozzle core body has a circumferential convex profiled outer surface, and the nozzle sleeve has a circumferential concave profiled inner surface. The two surfaces are closely matched to form a plurality of third channels with inclined angles, circumferential distribution, and Laval characteristics, so as to obtain high gas impact force and high cooling speed, and achieve the effect of fine, uniform, and fast solidification of atomized particles. The nozzle core and the nozzle sleeve are complex in design. If the atomization process is abnormal and causes blockage, the nozzle core and the nozzle sleeve will be scrapped, and the production cost is high.

[0004] Chinese patent CN200710175831.2 discloses a ring-shaped supersonic nozzle device for metal gas atomization, wherein multiple supersonic gas nozzles are evenly distributed on the cavity wall below the gas cavity, including a stabilizing section, a contracting section, a throat and a diffusion section. This structural design can make the airflow uniform and the turbulence small. However, it is difficult to machine a Laval hole with a diameter of less than 1 mm on a small-sized atomizing spray disc, and the integrated structure spray disc will be scrapped as a whole once it fails, and the production cost is high. Utility Model Content

[0005] In view of the current problems of complex atomizer disc structure and high scrap rate, the utility model proposes a split atomizer disc, optimizes the atomizer disc structure design, reduces production costs, and further increases the gas atomization jet speed, thereby improving the sphericity of atomized particles and the actual powder recovery rate. The specific technical scheme is as follows:

[0006] A split atomizing disk, comprising a spraying disk and a nozzle. Along the axial direction of the nozzle from top to bottom, there are successively arranged a molten liquid channel and an atomizing chamber. The nozzle is coaxially installed in the central opening of the spraying disk. An air flow chamber is formed between the nozzle and the spraying disk. The nozzle is provided with a plurality of inclined holes for connecting the atomizing chamber and the air flow chamber. The inclined holes are distributed along the circumferential direction of the molten liquid channel. The spraying disk is provided with an air flow channel communicated with the air flow chamber along its radial direction. One end of the air flow channel close to the edge of the spraying disk is connected with an air inlet.

[0007] Further, the number of the inclined holes is 15 - 35, the included angle between the axis of the inclined hole and the axis of the spraying disk is 15° - 35°, and the diameter of the inclined hole is 0.5 - 3 mm.

[0008] Further, during assembly, after the spraying disk and the nozzle are connected by threads, the assembly lines on the upper and lower sides are sealed by argon arc welding.

[0009] Further, the material of the spraying disk is 304 or 316L stainless steel, and the material of the nozzle is 304 or 316L stainless steel.

[0010] Further, there are two air flow channels and they are symmetrically arranged on both sides of the nozzle.

[0011] Further, the diameter of the air flow channel is 5 - 8 mm.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. Through the structural design of the split atomizing disk, it is convenient to replace the nozzle or the spraying disk. At the same time, the inclined holes distributed in a circle are separately arranged on the nozzle, reducing the processing difficulty and saving the processing cost.

[0014] 2. Through the air flow channel, the air flow chamber and the inclined holes, the gas atomization jet speed is increased, high gas impact force and high cooling speed are obtained, the powder sphericity is greatly improved, and the content of satellite balls is significantly reduced. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0016] Figure 1 is a schematic structural diagram of the split atomizing disk described in the present utility model;

[0017] Figure 2 is a schematic diagram of the nozzle described in the present utility model;

[0018] Figure 3It is a schematic diagram of the spray disc described in the present utility model;

[0019] Figure 4 It is the SEM image of the powder obtained in the embodiment of the present utility model.

[0020] In the figure: 1. Spray disc; 2. Nozzle; 3. Oblique hole; 4. Air flow channel; 5. Air inlet; 6. Melt channel; 7. Atomization chamber; 8. Air flow cavity. Detailed implementation manners

[0021] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0022] The present utility model provides the following specific implementation schemes:

[0023] As Figures 1-3 shown, the present utility model provides a split-type atomization disc, including a spray disc 1 and a nozzle 2. Inside the nozzle 2, a melt channel 6 and an atomization chamber 7 are sequentially arranged along the axial direction from top to bottom. The nozzle 2 is coaxially installed in the central opening of the spray disc 1. An air flow cavity 8 is formed between the nozzle 2 and the spray disc 1. The air flow cavity 8 is a chamber formed between the groove on the circumferential direction of the nozzle 2 and the spray disc 1. The air flow cavity 8 is located on the upper side of the atomization chamber 7. The nozzle 2 is provided with a plurality of oblique holes 3 for connecting the atomization chamber 7 and the air flow cavity 8. The oblique holes 3 are distributed along the circumferential direction of the melt channel 6. An air flow channel 4 communicating with the air flow cavity 8 is opened along the radial direction inside the spray disc 1. One end of the air flow channel 4 close to the edge of the spray disc 1 is connected with an air inlet 5 for connecting an air inlet pipe.

[0024] Preferably, the number of the oblique holes 3 is 15 - 35, the angle between the axis of the oblique hole 3 and the axis of the spray disc 1 is 15° - 35°, the diameter of the oblique hole 3 is 0.5 - 3 mm, the diameter of the air flow channel 4 is 5 - 8 mm, and the diameter of the air inlet 5 is 15 - 20 mm. The outer diameter of the spray disc 1 is 185 - 195 mm, the height of the spray disc 1 is 35 - 40 mm, the height of the nozzle 2 is 31 - 35 mm, and the outer diameter of the nozzle 2 is 58 - 60 mm.

[0025] Preferably, during assembly, after the spray disc 1 and the nozzle 2 are threadedly connected, the assembly lines on the upper and lower sides are sealed by argon arc welding.

[0026] Preferably, the spray disc 1 is made of 304 or 316L stainless steel, and the nozzle 2 is made of 304 or 316L stainless steel, which is more heat-resistant and lighter in material.

[0027] Preferably, there are two air flow channels 4 and they are symmetrically arranged on both sides of the nozzle 2, so that the air flow is more stable.

[0028] Taking the atomization of Ni60 alloy melt at 1430 °C as an example, the included angle between the inclined hole 3 and the axis of the nozzle 2 is 30°, the diameter of the inclined hole 3 is 2 mm, the number of inclined holes 3 is 24, the diameter of the air inlet 5 is 18 mm, the diameter of the air flow channel 4 is 7 mm, the atomizing gas is nitrogen, the atomizing pressure is 3.0 MPa, the height of the nozzle 2 is 31.7 mm, the outer diameter of the nozzle 2 is 58 mm, the outer diameter of the spray disc 1 is 185.5 mm, and the height of the spray disc 1 is 35.6 mm. The melt channel 6 is connected to the alloy melt conveying equipment, the air inlet 5 is connected to the nitrogen conveying equipment, the alloy solution flows out from the melt channel 6, nitrogen gas is sprayed out from the inclined hole 3 after passing through the air flow channel 4 and the air flow cavity 8 in sequence, and finally the nitrogen gas cools and atomizes the alloy solution flowing out from the melt channel 6 into powder, as Figure 4 The SEM photograph of the obtained metal powder is shown as follows. The proportion of the atomized powder with a particle size less than 90 μm is 50.12 wt%, and the proportion of the atomized powder with a particle size less than 106 μm is 72.49 wt%.

[0029] Taking the atomization of Ni60 alloy melt at 1430 °C as an example, the included angle between the inclined hole 3 and the axis of the nozzle 2 is 28°, the diameter of the inclined hole 3 is 1 mm, the number of inclined holes 3 is 20, the diameter of the air inlet 5 is 18 mm, the diameter of the air flow channel 4 is 7 mm, the atomizing gas is nitrogen, the atomizing pressure is 3.0 MPa, the height of the nozzle 2 is 31.7 mm, the outer diameter of the nozzle 2 is 58 mm, the outer diameter of the spray disc 1 is 185.5 mm, and the height of the spray disc 1 is 35.6 mm. The proportion of the atomized metal powder with a particle size less than 90 μm is 45.62 wt%, and the proportion of the atomized metal powder with a particle size less than 106 μm is 69.56 wt%.

[0030] Through the structural design of the split atomization disc, it is convenient to replace the nozzle 2 or the spray disc 1. At the same time, the inclined holes 3 distributed in a circular pattern are separately arranged on the nozzle 2, which reduces the processing difficulty and saves the processing cost; through the design of the air flow channel 4, the air flow cavity 8 and the inclined hole 3, the atomizing gas jet velocity is increased, high gas impact force and high cooling rate are obtained, the powder sphericity is greatly improved, and the satellite ball content is significantly reduced.

[0031] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed.

Claims

1. A split atomizing disk, characterized in that: The invention comprises a spray disc (1) and a nozzle (2), wherein a melt channel (6) and an atomizing chamber (7) are sequentially arranged in the nozzle (2) along its axial direction from top to bottom, and the nozzle (2) is coaxially mounted in a central opening of the spray disc (1), and an air flow cavity (8) is formed between the nozzle (2) and the spray disc (1). The nozzle (2) is provided with a plurality of inclined holes (3) for connecting the atomizing chamber (7) and the air flow cavity (8), and the inclined holes (3) are distributed along the circumferential direction of the melt channel (6). An air flow channel (4) communicating with the air flow cavity (8) is arranged in the spray disc (1) along its radial direction, and an air inlet (5) is connected to one end of the air flow channel (4) close to the edge of the spray disc (1).

2. A split atomizer disk according to claim 1, characterized in that: The number of the inclined holes (3) is 15-35, the angle between the axis of the inclined hole (3) and the axis of the spray disc (1) is 15°-35°, and the diameter of the inclined hole (3) is 0.5-3 mm.

3. A split atomizer disk according to claim 1, characterized in that: During assembly, the spray plate (1) and the nozzle (2) are connected by threads and then the assembly lines on the upper and lower sides are sealed by argon arc welding.

4. A split atomizing disk according to claim 1, characterized in that: The spray plate (1) is made of 304 or 316L stainless steel, and the nozzle (2) is made of 304 or 316L stainless steel.

5. The split atomizing disk according to claim 1, characterized in that: There are two air flow channels (4) which are symmetrically arranged on both sides of the nozzle (2).

6. A split atomizing disk according to claim 5, characterized in that: The diameter of the air flow channel (4) is 5-8 mm.

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