Water atomizing nozzle

Abstract

The water atomizing nozzle comprises a disc-shaped main body, a liquid flow port penetrates through the middle of the main body; the liquid flow port is provided with an expansion port on the lower side of the main body; the expanding opening is in a frustum shape with the upper end diameter smaller than the lower end diameter; the main body is provided with an annular cavity on the outer side of the liquid flow port; one side of the main body is provided with a water inlet communicated with the annular cavity; a plurality of main spraying holes are formed in the expansion opening at equal intervals and communicate with the annular cavity; an auxiliary spraying hole is formed between every two adjacent main spraying holes and communicates with the annular cavity. A plurality of mounting holes are equidistantly formed in the outer side of the main body. High-speed liquid flows sprayed by the main spraying holes and the auxiliary spraying holes are all gathered at the position of molten metal flowing down from the liquid flow opening, and the molten metal can be effectively crushed for multiple times through the coverage of large fog drops of the main spraying holes and the combination of uniformly refined fog drops of the auxiliary spraying holes, so that the molten metal is crushed to be finer, and the quality of the molten metal is improved. And due to circumferential uniform impact formed by the multiple main spraying holes and the multiple auxiliary spraying holes, the crushed molten metal is closer to a spherical shape, and uniform small-particle-size powder with the high sphericity degree is obtained.

Description

Technical Field

[0001] The utility model belongs to the field of water atomization powder making equipment, in particular to a water atomization nozzle. Background Art

[0002] The water atomization preparation method is one of the commonly used methods for making metal powder. The molten metal flows out through the tundish, and then high-pressure water is sprayed out through the nozzle to break up the molten metal to form tiny metal droplets, which are then settled and cooled into metal particles. The operating cost and investment in equipment are lower than those of the gas atomization preparation method, and it is widely used. The water atomization preparation method is commonly used nowadays. Under the same water flow rate, during the first atomization process, the nozzle aperture is small and the atomization efficiency is low. During the second atomization, the nozzle aperture is large but the flow rate is small, and it is not enough to completely atomize to obtain small-particle powder in the same time. The resulting metal powder has a large particle size and low sphericity, which is difficult to meet the sphericity requirements of metal powders used in injection molding and additive manufacturing. Powders that do not meet the requirements need to be finely screened and sorted and then returned to the furnace for remelting, which greatly increases the workload. Utility Model Content

[0003] The utility model aims to provide a water atomizing nozzle to solve the technical problem that the metal powder obtained by the current metal powder water atomizing preparation method has a large particle size and low sphericity, which makes it difficult to meet the sphericity requirements of metal powders used in injection molding and additive manufacturing. Powders that do not meet the requirements need to be finely screened and sorted and then returned to the furnace for remelting, which greatly increases the workload.

[0004] To achieve the above purpose, the specific technical solution of the water atomizing nozzle of the utility model is as follows:

[0005] The water atomizing nozzle comprises a disc-shaped main body; a liquid flow port is provided through the middle of the main body; an expansion port is provided at the lower side of the main body; the expansion port is in the shape of a cone with a diameter at the upper end smaller than that at the lower end; an annular cavity is provided at the outer side of the liquid flow port of the main body; a water inlet is provided on one side of the main body and connected with the annular cavity; a plurality of main spray holes are equidistantly provided on the expansion port and connected with the annular cavity; a secondary spray hole is provided between two adjacent main spray holes and connected with the annular cavity; and a plurality of mounting holes are equidistantly provided on the outer side of the main body.

[0006] Furthermore, four main spray holes are arranged in a cross shape.

[0007] Furthermore, the diameter of the main spray hole is set to 20 mm; the angle between the main spray hole and the central axis of the liquid flow port is 50°.

[0008] Furthermore, the diameter of the secondary spray hole is set to 15 mm; the angle between the secondary spray hole and the central axis of the liquid flow port is 40°.

[0009] The utility model water atomizing nozzle has the following advantages: the utility model water atomizing nozzle is installed under the tundish in a normal assembly manner through the mounting hole, the molten metal flowing out of the tundish flows to the liquid flow port arranged in the middle part of the main body, and high-pressure water is introduced into the annular cavity through the water inlet, and the high-pressure water flows through the main spray hole and the auxiliary spray hole connected to the annular cavity to spray out, so as to break and solidify the molten metal, the 20mm main spray hole provides a larger water flow and atomization amount, and can cover a larger area, and the larger aperture can help to produce larger droplets, and the 15mm auxiliary spray hole has a smaller aperture and can effectively refine and evenly atomize the particle size, and the high-speed liquid flows sprayed from the multiple main spray holes and the auxiliary spray holes are respectively aggregated at the position of the molten metal flowing under the liquid flow port, and the combination of the large area coverage of the large droplets of the main spray hole and the uniformly refined droplets of the auxiliary spray hole can effectively crush the molten metal for multiple times, so that the molten metal is crushed finer, and the circumferential uniform impact formed by the multiple main spray holes and the auxiliary spray holes makes the broken molten metal closer to a sphere, so as to obtain a uniform small-particle powder with high sphericity. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0011] Figure 2 This is a schematic diagram of the expansion port structure of the utility model;

[0012] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0013] Explanation of the markings in the figure: 1. Main body; 2. Liquid flow port; 3. Expansion port; 4. Annular cavity; 5. Water inlet; 6. Main spray hole; 7. Auxiliary spray hole; 8. Mounting hole. DETAILED DESCRIPTION

[0014] In order to better understand the purpose, structure and function of the utility model, the water atomizing nozzle of the utility model is further described in detail below in conjunction with the accompanying drawings.

[0015] like Figure 1-3 As shown, the utility model water atomizing nozzle comprises a disc-shaped main body 1; a liquid flow port 2 is provided through the middle of the main body 1; an expansion port 3 is provided at the lower side of the main body 1; the expansion port 3 is a frustum-shaped with an upper end diameter smaller than a lower end diameter; an annular cavity 4 is provided at the outer side of the liquid flow port 2 of the main body 1; a water inlet 5 is provided on one side of the main body 1 to communicate with the annular cavity 4; a plurality of main spray holes 6 are equidistantly provided on the expansion port 3 to communicate with the annular cavity 4; an auxiliary spray hole 7 is provided between two adjacent main spray holes 6 to communicate with the annular cavity 4; a plurality of mounting holes 8 are equidistantly provided on the outer side of the main body 1.

[0016] Combination Figure 1-3As shown, the water atomizing nozzle is installed under the tundish in a normal assembly manner through the mounting hole 8. The molten metal flowing out of the tundish flows to the liquid flow port 2 set in the middle of the main body 1, and high-pressure water is introduced into the annular cavity 4 through the water inlet 5. The high-pressure water flows through the main spray hole 6 and the auxiliary spray hole 7 connected to the annular cavity 4 and set at the expansion port 3 to spray out, so as to crush and solidify the molten metal. The high-speed liquid flows sprayed from the multiple main spray holes 6 and the auxiliary spray holes 7 are respectively gathered at the position of the molten metal flowing under the liquid flow port 2. The uniform water mist jet formed by the multiple main spray holes 6 and the auxiliary spray holes 7 uniformly arranged in the circumferential direction impacts from the circumferential direction to make the crushed molten metal closer to a sphere, so as to obtain a uniform small-particle powder with high sphericity, thereby increasing the sphericity of the finished metal powder.

[0017] Four main spray holes 6 are arranged in a cross shape; the auxiliary spray holes 7 are arranged between two adjacent main spray holes 6, and the four main spray holes 6 and the auxiliary spray holes 7 are respectively arranged relative to the liquid flow port 2 to form a circumferentially uniform distribution of the liquid flow port 2. The water mist jets sprayed through the main spray holes 6 and the auxiliary spray holes 7 can effectively cover the metal liquid flow remaining through the liquid flow port 2, so that the metal liquid flow is evenly stressed, thereby preventing the problem of low sphericity of the finished metal powder and reducing the workload of remelting.

[0018] The diameter of the main spray hole 6 is set to 20mm; the angle between the main spray hole 6 and the central axis of the liquid flow port 2 is 50°, and the diameter of the auxiliary spray hole 7 is set to 15mm; the angle between the auxiliary spray hole 7 and the central axis of the liquid flow port 2 is 40°. The 20mm main spray hole 6 provides a larger water flow and atomization amount, can cover a larger area, and a larger aperture can help produce larger droplets. The 15mm auxiliary spray hole 7 has a smaller aperture and can effectively refine and evenly atomize the particle size. The water sprayed from the main spray hole 6 and the auxiliary spray hole 7 is distributed in a fan shape, and the fan angle is 15°. The water mist jets sprayed from the main spray hole 6 and the auxiliary spray hole 7 set at different angles form a double combined crushing effect on the metal liquid flow. The large area coverage of the large droplets of the main spray hole 6 and the uniformly refined droplets of the auxiliary spray hole 7 completely cover the metal liquid flow flowing through the liquid flow port 2. The metal liquid is effectively crushed multiple times at multiple angles, so that the metal liquid is crushed finer, so that the fine powder rate of the obtained metal powder product is higher and the tap density is greater.

[0019] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. Water atomizing nozzle, characterized in that: The invention comprises a disc-shaped main body (1); a liquid flow port (2) is provided through the middle of the main body (1); an expansion port (3) is provided on the lower side of the main body (1) of the liquid flow port (2); the expansion port (3) is in the shape of a cone with a diameter at the upper end smaller than that at the lower end; an annular cavity (4) is provided on the main body (1) at the outer side of the liquid flow port (2); a water inlet (5) is provided on one side of the main body (1) and is connected to the annular cavity (4); a plurality of main spray holes (6) are equidistantly provided on the expansion port (3) and are connected to the annular cavity (4); a secondary spray hole (7) is provided between two adjacent main spray holes (6) and is connected to the annular cavity (4); and a plurality of mounting holes (8) are equidistantly provided on the outer side of the main body (1).

2. The water atomizing nozzle according to claim 1, characterized in that: The main spray holes (6) are provided with four arranged in a cross shape.

3. The water atomizing nozzle according to claim 1, characterized in that: The diameter of the main spray hole (6) is set to 20 mm; the angle between the main spray hole (6) and the central axis of the liquid flow port (2) is 50°.

4. The water atomizing nozzle according to claim 1, characterized in that: The diameter of the secondary spray hole (7) is set to 15 mm; the angle between the secondary spray hole (7) and the central axis of the liquid flow port (2) is 40°.

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