Highly efficient particulate collectors, such as for dust and street debris collected by a mobile street cleaning vehicle, with very low pressure loss are disclosed. One embodiment uses a specially contoured passage to separate the solid particles from particulate-laden gas stream by rapid direction
Highly efficient particulate collectors, such as for dust and street debris collected by a mobile street cleaning vehicle, with very low pressure loss are disclosed. One embodiment uses a specially contoured passage to separate the solid particles from particulate-laden gas stream by rapid directional change at a throat region. By using the Venturi effect at the accelerating zone communicating with a gas return channel from the particulate retaining chamber, a small amount of the gas will be recirculated from the deposit zone to help move and retain the separated particles in a confined collection receptacle.
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1. A particulate separation apparatus comprising: a conduit structure having an inlet passage for conveying a particulate-laden gas stream, the inlet passage comprising: an upstream end comprising a first inlet passage wall and a second inlet passage wall positioned opposite the first inlet passage
1. A particulate separation apparatus comprising: a conduit structure having an inlet passage for conveying a particulate-laden gas stream, the inlet passage comprising: an upstream end comprising a first inlet passage wall and a second inlet passage wall positioned opposite the first inlet passage wall; anda downstream end, wherein a separator wall divides the downstream end of the inlet passage into i) an outlet channel formed by the first inlet passage wall and the separator wall, and ii) a particulate-collection channel formed by the second inlet passage wall and the separator wall; anda gap formed in the second inlet passage wall, wherein the gap is located between the upstream end of the inlet passage wall and the separator wall, and wherein the gap is in fluid connection with the particulate-collection channel such that a recirculating flow may recirculate from the particulate-collection channel into the inlet passage via the gap. 2. The apparatus of claim 1 wherein the outlet channel and the particulate-collection channel are diverging. 3. The apparatus of claim 1 further comprising a particulate-collection chamber positioned downstream of the particulate-collection channel. 4. The apparatus of claim 3 wherein the particulate-collection chamber comprises at least one cleanout door. 5. The apparatus of claim 1, wherein the first inlet passage wall comprises a curved wall portion, the curved wall portion extending between the upstream end of the inlet passage and the outlet channel. 6. The apparatus of claim 1 wherein the upstream end of the inlet passage and the outlet channel are generally in-line. 7. The apparatus of claim 1 wherein an angle between the upstream end of the inlet passage and the outlet channel is between 75 and 120 degrees. 8. The apparatus of claim 1, wherein the apparatus is part of a mobile vacuum system further comprising: a fan capable of providing a vacuum source to force a particulate-leaden gas stream into the inlet passage;a set of wheels capable of moving the mobile vacuum system; anda frame to support the apparatus of claim 1 and the fan, wherein the frame is further connected to the set of wheels. 9. The apparatus of claim 1, wherein the particulate separation apparatus is a first particulate separation apparatus, wherein the inlet passage is a first inlet passage, the first particulate separation apparatus further comprising: a second particulate separation apparatus positioned downstream of the first particulate separation apparatus, the second particulate separation apparatus comprising: a cylindrical body, the cylindrical body having a first cross-sectional diameter, a body top end, and a body bottom end;a second inlet passage tangentially entering the cylindrical body adjacent to the top end, wherein the second inlet passage is downstream of the outlet channel of the conduit structure;an outlet passage tangentially exiting the cylindrical body adjacent to the bottom end;a first tube, the first tube having a second cross-sectional diameter smaller than the first cross-sectional diameter, and a first tube lower end, wherein the lower end of the first tube extends generally coaxially through the top end of the cylindrical body; anda second tube, the second tube having a second tube upper end, wherein the upper end of the second tube extends through the bottom end of the cylindrical body, wherein the second tube upper end is in general coaxial alignment with the first tube lower end, and wherein the lower end of the first tube and the upper end of the second tube are separated by a gap. 10. A method of separating particulate matter from a gas stream comprising: conveying a particulate-laden gas stream through an inlet passage of a conduit structure, the inlet passage comprising: an upstream end comprising a first inlet passage wall and a second inlet passage wall positioned opposite the first inlet passage wall;a downstream end, wherein a separator wall divides the downstream end of the inlet passage into i) an outlet channel formed by the first inlet passage wall and the separator wall, and ii) a particulate-collection channel formed by the second inlet passage wall and the separator wall; andwherein the conduit structure further comprises a gap formed in the second inlet passage wall, wherein the gap is located between the upstream end of the inlet passage wall and the separator wall, and wherein the gap is in fluid connection with the particulate-collection channel;separating particulate matter from the particulate-leaden gas stream;directing the particulate matter into the particulate-collection channel;conveying a portion of the particulate-leaden gas stream out of the conduit structure via the outlet channel; andcausing, by way of the particulate-laden gas stream being conveyed past the gap, a recirculating flow from the particulate-collection channel to the inlet passage via the gap. 11. An apparatus for separating particulate matter from a gas stream comprising: a cylindrical body, the cylindrical body having a first cross-sectional diameter, a body top end, and a body bottom end;an inlet passage tangentially entering the cylindrical body adjacent to the top end;an outlet passage tangentially exiting the cylindrical body adjacent to the bottom end;a first tube, the first tube having a second cross-sectional diameter smaller than the first cross-sectional diameter, and a first tube lower end, wherein the lower end of the first tube extends generally coaxially through the top end of the cylindrical body; anda second tube, the second tube having a second tube upper end, wherein the upper end of the second tube extends through the bottom end of the cylindrical body, wherein the second tube upper end is in general coaxial alignment with the first tube lower end, and wherein the lower end of the first tube and the upper end of the second tube are separated by a gap. 12. The apparatus of claim 11 further comprising a recirculation channel, wherein the first tube further comprises a first tube upper end, and wherein the recirculation channel provides a fluid connection between the outlet passage and the upper end of the first tube. 13. The apparatus of claim 11 further comprising a particulate-collection chamber positioned downstream of the outlet passage. 14. The apparatus of claim 13 wherein the particulate-collection chamber comprises a reverse flow cyclone. 15. The apparatus of claim 11, wherein the apparatus is part of a mobile vacuum system further comprising: a fan capable of providing a vacuum source to force a particulate-leaden gas stream into the inlet passage;a set of wheels capable of moving the mobile vacuum system; anda frame to support the apparatus of claim 9 and the fan, wherein the frame is further connected to the set of wheels. 16. The apparatus of claim 11 wherein the body top end is helical in shape at a downward angle of 15 to 30 degrees. 17. The apparatus of claim 11 wherein the body bottom end is helical in shape at a downward angle of 15 to 30 degrees. 18. The apparatus of claim 11 wherein the first and second tubes have substantially the same diameter, and wherein a ratio of the diameter of the first and second tubes to the diameter of the cylindrical body is between 1.75 and 3. 19. The apparatus of claim 11 wherein the first and second tubes have substantially the same diameter, and wherein the gap is between 0.75 to 2 times the diameter of the first and second tubes. 20. The apparatus of claim 11 wherein a distance between the body top end and the lower end of the first tube is between 2 and 5 times the first cross-sectional diameter.
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이 특허에 인용된 특허 (11)
Tanase Kozo (Hozumi JPX), Air-dust separation system for a pneumatic road-cleaning vehicle.
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