IPC분류정보
국가/구분 |
United States(US) Patent
공개
|
국제특허분류(IPC7판) |
|
출원번호 |
16839630
(2020-04-03)
|
공개번호 |
20200331001
(2020-10-22)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
0 |
초록
▼
In an axial jet mill, an internal structure having a cylindrical outer surface is positioned within a housing to establish a raceway for the circulating movement of gas and solid material while maintaining the gas and solid material in close proximity to the outlets of gas nozzles distributed around
In an axial jet mill, an internal structure having a cylindrical outer surface is positioned within a housing to establish a raceway for the circulating movement of gas and solid material while maintaining the gas and solid material in close proximity to the outlets of gas nozzles distributed around the perimeter of the raceway. Solid material enters the jet mill though a bottom wall of the housing and passes into the raceway though gaps between the bottom of the internal structure and a bottom wall of the housing. Particles and gas exit the jet mill though a central outlet in the housing located above the internal structure.
대표청구항
▼
1. A jet mill comprising: a housing having a top wall, a bottom wall, and an outer wall extending from the top wall to the bottom wall, thereby forming a closure, the outer wall having a substantially circular, cylindrical inner surface uniformly spaced from a central axis;a plurality of nozzles dis
1. A jet mill comprising: a housing having a top wall, a bottom wall, and an outer wall extending from the top wall to the bottom wall, thereby forming a closure, the outer wall having a substantially circular, cylindrical inner surface uniformly spaced from a central axis;a plurality of nozzles disposed around the perimeter of said outer wall for projecting jets of gas inward through said outer wall, each of said nozzles being arranged to project a jet of gas in a direction on a side of said central axis such that said jets can produce a unidirectional circulating flow of gas and particles of solid material within the housing;an internal structure within the housing, said internal structure having a substantially circular cylindrical outer surface coaxial with, spaced from, and opposed to, said inner surface of the outer wall of the housing, the diameter of the cylindrical outer surface being sufficiently large that the directions of the jets of fluid emitted by the nozzles intersect the cylindrical outer surface, and said cylindrical outer surface forming, with said substantially circular, cylindrical inner surface of said outer wall of the housing, an annular raceway for guiding, and confining, said unidirectional circulating flow of gas and particles of solid material about said central axis, thereby limiting inward movement, and increasing concentration of, particles of solid material;an inlet passage for movement of solid material along with a material-carrying fluid into said raceway; andan outlet for movement of comminuted solid material from said annular raceway out of said housing. 2. The jet mill according to claim 1, in which said internal structure has a hollow interior space, and in which said inlet passage is arranged to deliver solid material along with a material-carrying gas into said hollow interior space, and including at least one passage adjacent said bottom wall of the housing, for movement of said solid material along with a material-carrying gas from said hollow interior space into said annular raceway 3. The jet mill according to claim 2, in which said at least one passage adjacent said bottom wall of the housing comprises a gap between said internal structure and said bottom wall of the housing. 4. The jet mill according to claim 1, in which said outlet has an adjustable aperture. 5. The jet mill according to claim 1, in which said internal structure has a top surface below, and spaced from, the top wall of the housing, and in which said outlet comprises a passage extending through said top wall of the housing, at a central location in said top wall, whereby particles ground in said raceway by the action of said jets of gas directed by said nozzles, flow through the space between said top surface of the internal structure and the top wall of the housing and pass through said outlet. 6. The jet mill according to claim 5, in which said outlet has an adjustable aperture. 7. The jet mill according to claim 45 in which said outlet includes a cylindrical tube having an opening extending from a lower end thereof to an upper end thereof, and including means for adjusting the spacing of said lower end of the cylindrical tube from said top surface of the internal structure. 8. The jet mill according to claim 1, in which said internal structure has a hollow interior space, and said inlet passage is arranged to deliver solid raw feed material along with a material-carrying gas into said hollow interior space, and including at least one passage adjacent said bottom wall of the housing, for movement of said solid material along with a material-carrying gas from said hollow interior space into said annular raceway, in which said internal structure has a top surface below, and spaced from, the top wall of the housing, and in which said outlet comprises a passage extending through said top wall of the housing, at a central location in said top wall, whereby particles ground in said raceway by the action of said jets of gas directed by said nozzles, flow through the space between said top surface of the internal structure and the top wall of the housing and pass through said outlet. 9. The jet mill according to claim 1, in which each of said nozzles of said plurality of nozzles is arranged to project a jet of gas in a direction tangent to an imaginary circular cylinder coaxial with said substantially cylindrical outer surface of said internal structure but having a diameter smaller than the diameter of said substantially cylindrical outer surface of said internal structure.
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