US3759580A - Structure for transporting fluid-entrainable material - Google Patents

Structure for transporting fluid-entrainable material Download PDF

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Publication number
US3759580A
US3759580A US00255700A US3759580DA US3759580A US 3759580 A US3759580 A US 3759580A US 00255700 A US00255700 A US 00255700A US 3759580D A US3759580D A US 3759580DA US 3759580 A US3759580 A US 3759580A
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United States
Prior art keywords
fluid
flow path
downstream
corner
flow
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00255700A
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English (en)
Inventor
D Ott
I Reba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fort James Corp
Original Assignee
Crown Zellerbach Corp
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/52—Adaptations of pipes or tubes
    • B65G53/521—Adaptations of pipes or tubes means for preventing the accumulation or for removal of deposits

Definitions

  • No.: 255,700 ranged in the corner to increase the downstream flow velocity along a downstream surface in the second flow path leading from the inner radius of the corner as [a] 302/64, 302/29 compared to downstream flow velocity along the sub fuss! "i; "6 face f g the outer radius of the comer.
  • l e o 3 2/29 2 means are provided cooperating with the Coanda noz- 02/17 64 zle in the comer to remove some entraining fluid from the first flow path before the particles reach the comer [56] Cited to slow them down, and then reintroduce the removed UNITED STATES PATENTS entraining fluid into the second flow path.
  • vent means are pro- 3,205,0l6 9/1965 Panning... 302/23 vided to remove this fluid downstream of the corner 3,321,251 5/1967 Reitere r 302/23 and structure is disclosed which permits reintroduction of the vented fluid into the corner.
  • the present invention relates to structure for transporting fluid-entrainable material in an entraining fluid.
  • Particulate material such as wood chips, sand, grain, or other fluid-entrainable material
  • Particulate material is often conveyed through pipes by entraining this material in an entraining fluid, such as air, and rapidly moving the material with the fluid by aid of fans, blowers or the like from a zone at the inlet of the pipe to a remotely located outlet zone. It is often necessary to provide bends or corners in the conveying pipe so that the material is turned from a first flow path to a second flow path extending in a different direction.
  • Structural means such as a Coanda nozzle, is positioned in the vicinity of the corner to increase the flow velocity of the entraining fluid along the surface in a downstream direction forming a continuation of the inner radius of the comer as compared to the downstream flow velocity along the surface in the second flow path forming a continuation of the outer radius of the comer.
  • Another aspect of the present invention resides in taking advantage of theentrainment properties of Coanda nozzles to remove a portion of the entraining fluid from the first flow path to slow the particles prior to reaching the corner and then reintroducing this ,removed entraining fluid into the second flow path.
  • vent means for venting or removing auxiliary entraining fluid from the flow path downstream of its introduction and recirculating this removed fluid into the system.
  • FIG. 1 is a side sectional view through a structure of one embodiment of the present invention
  • FIG. 2 is a sectional view taken on line 22 of FIG.
  • FIG. 3 is a side sectional view through a structure fonning another embodiment of the present invention.
  • FIG. 4 is a diagrammatic sectional view to illustrate dimension and flow velocities obtained under specified operating conditions of a structure made in accordance with the present invention.
  • a Coanda nozzle may, therefore, be defined as a device which utilizes this phenomenon.
  • FIGS. 1 and 2 there is disclosed structure comprising means defining a first flow path 10 which leads, in the direction of arrows as illustrated in the drawing, around a comer 12 into a second flow path 14 which extends in a different direction from the first flow path.
  • the first flow path 10 is generally rectangular'in cross-sectional configuration, and the flow path is enclosed by bottom wall 16, top wall 18 and opposed side walls 20 and 22.
  • the second flow path is also generally rectangular in cross-sectional configuration and is defined by bottom wall 24, top wall 26 and opposed side walls 28 and 30.
  • the top wall 18 has a portion 32'which diverges upwardly in a direction leading into the corner to provide an enlarged zone in the corner which is capable of receiving a Coanda nozzle 34 having a curved upper sur- I I under pressure from a compressor or pump 40, having a duct 42 leading to the chamber.
  • the bottom surface 52 of the nozzle 34 is flat, and the nozzleis so positioned in the enlarged corner zone so that the surface 52 provides an upper boundary for particulate material being entrained along a substantially straight line in the first flow path 10.
  • the upper curved surface 36 of the nozzle 34 provides a lower boundary for a secondary path 54 which is in communicationwith the first flow path 10 through opening 56.
  • a screen 58 extends across the opening to this secondary path 54, and the mesh size of the screen is chosen so as to prevent entrained particulate material from entering this secondary flow path while permitting entraining fluid to pass therethrough.
  • the bottom surface 52 of nozzle 34 is slanted in such a manner that the cross-sectional area of the first flow path decreases in a downstream direction starting from an area adjacent upstream end 60 of the nozzle surface 52 toward downstream end 62 of the nozzle surface 52.
  • This reduction in the cross-sectional area of the flow path is desirable to aid in assuring that the entraining fluid has sufficient velocity while passing through this region of decreased area to maintain entrainment of the particles, taking into account the fact that some of the entraining fluid has been removed through secondary path 54.
  • Wall 26 which defines one boundary of second flow path 14 provides a first surface portion 64 which extends in a direction intersecting the first flow path downstream in continuation of the outer radius of the corner between the first and second flow paths.
  • Wall 24 which defines another boundary of second flow path 14 provides a second surface portion 66 which extends downstream of the corner 12 in continuation of the inner radius of the corner.
  • the flow attachment surface 50 of nozzle 34 is positioned so as to direct a curtain of entraining fluid moving at high velocity in a direction extending across the path of flow of entrained material traveling along the first flow path 10.
  • the curtain is directed toward surface 66.
  • This high velocity curtain follows surface 66 so that the velocity of entraining fluid flowing in a downstream direction along second surface 66 is substantially increased as compared to the flow velocity extending downstream along first surface 64.
  • This increased velocity along surface 66 has a rapid turning effect on the entrained material and has been found to substantially reduce impingement of the entrained material against surface 64, and, therefore, reduces erosion of this surface.
  • this increased velocity flow along surface 66 tends to re-entrain the entraining fluid in a direction away from the outer surface 64 and, in turn, carries the material in a direction away from wall 64 which minimizes direct impingement of material against surface 66.
  • FIG. 4 Operation of the structure thus far described can best be understood by referring to FIG. 4 in connection with the following description.
  • a device, as illustrated at FIG. 4, was constructed with the following dimensions:
  • Air was supplied to chamber 38 under a pressure of 5.0 psig, and the width (distance between lips 44 and 46) of slit 48 was 0.050 inch.
  • a pitot tube was inserted through small openings in the walls at various points in the system to obtain velocity profiles of air moving through various parts of the system, and velocities (in feet per minute) are indicated at FIG. 4.
  • the width of the slit 48 is preferably selected to be between about 0.001 to 0.150 inch.
  • the cross-sectional area of the slit opening should preferably be between about 0.1 percent and 10.0 percent of the cross-sectional area in the duct between comer l2 and downstream end 62 of the nozzle.
  • Pressures supplied to chamber 38 may be between 1 psig and 400 psig.
  • an increase in the pressure of fluid that is supplied to the slit will increase the velocity of the fluid as it exits from the slit and moves over attachment surface 50 and, therefore, the velocity imparted to the material being entrained will increase.
  • a venting chamber 70 may be provided in the second flow path 14 downstream of corner 12. This venting chamber can lead through a valve 72 to an outlet 74.
  • the outlet 74 may be connected to an inlet pipe 76 leading to compressor or pump 40 so that vented fluid can be continuously recirculated through the system.
  • a pipe 80 defining a first flow path 82 for entrained material, and the material passes around corner 84 to a second flow path 86 defined by a pipe 88.
  • a first downstream surface portion 90 in the second flow path extends in a direction intersecting the first flow path downstream in continuation of the outer radius of the corner 84, and a second downstream surface portion 92 extends downstream of the corner in continuation of the inner radius of corner 84.
  • the surface portion 92 forms a flow attachment surface for fluid exiting from slit 94 in Coanda nozzle 96, the fluid being supplied from pump or compressor 98 via chamber 100.
  • the velocity of the fluid moving along surface 92 in a downstream direction is substantially greater than the velocity of the fluid moving along surface 90 in a downstream direction.
  • the flow entrainment caused by this high velocity movement along surface 92 causes the entrained material to rapidly turn the corner and follow second flow path 86.
  • this region seeks" additional fluid for entrainment. It is, therefore, desirable to provide an opening 102 through the outer bend of surface 90 to provide a source for this additional fluid.
  • This opening 102 could be in communication with the atmosphere, or, optionally, and as shown in FIG; 3, it may be in communication with a venting chamber 104 downstream of this corner via auxiliary duct 106 to recirculate vented fluid.
  • an additional venting duct 108 with valve 110 may be provided, and, if desired, this venting duct 108 may be attached in fluid flow communication to an inlet 112 to compressor 98.
  • Structure for transporting and turning material entrained in an entraining fluid from a first flow path around a corner to a second flow path extending in a different direction from the first flow path including:
  • means defining said second flow path including a first downstream surface portion which extends in a direction intersecting the first flow path downstream in continuation of the outer radius of the comer, and said means defining the second flow path further including a second downstream surface portion which extends downstream of the corner in continuation of the corner;
  • means for increasing the flow velocity of the entraining fluid in a downstream direction along said second downstream surface as compared to the flow velocity along said first downstream surface comprising a nozzle having a chamber for receiving fluid under pressure, pump means for supplying fluid to said chamber, means defining an exit slit leading from said chamber, and a curved fluid flow attachment surface leading in a downstream direction from said slit, said fluid flow attachment surface being positioned to utilize the Coanda effect to direct the fluid attached thereto in a downstream direction along said second downstream surface portion whereby a turning of said entrained material is facilitated and impingement of the entrained material against the first downstream surface portion is reduced.
  • Structure for transporting fluid-entrainable material entrained in an entraining fluid from a first flow path around a corner to a second flow path extending in a different direction from the first flow path said structure including:
  • Means comprising nozzle structure within said corner for removing entraining fluid from said entrainable material passing through said first flow path and for redirecting the removed entraining fluid into the second flow path, said nozzle structure including a chamber for receiving fluid under pressure and pump means for supplying fluid to the chamber,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Coating Apparatus (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Nozzles (AREA)
US00255700A 1972-05-22 1972-05-22 Structure for transporting fluid-entrainable material Expired - Lifetime US3759580A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25570072A 1972-05-22 1972-05-22

Publications (1)

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US3759580A true US3759580A (en) 1973-09-18

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US00255700A Expired - Lifetime US3759580A (en) 1972-05-22 1972-05-22 Structure for transporting fluid-entrainable material

Country Status (8)

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US (1) US3759580A (enrdf_load_stackoverflow)
JP (1) JPS5342956B2 (enrdf_load_stackoverflow)
CA (1) CA975823A (enrdf_load_stackoverflow)
DE (1) DE2326011A1 (enrdf_load_stackoverflow)
FR (1) FR2185569B1 (enrdf_load_stackoverflow)
GB (1) GB1406951A (enrdf_load_stackoverflow)
NL (1) NL7306912A (enrdf_load_stackoverflow)
SE (1) SE401159B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4474511A (en) * 1980-12-10 1984-10-02 Molins Limited Continuous tobacco feed
EP1026107A1 (en) * 1999-02-05 2000-08-09 Agritec S.r.l. Joint for pipelines for pneumatic transportation of loose materials
WO2014037206A1 (de) * 2012-09-04 2014-03-13 Windmöller & Hölscher Kg Vorrichtung zum absaugen von abfallprodukten einer produktionsmaschine
WO2014037207A1 (de) * 2012-09-04 2014-03-13 Windmöller & Hölscher Kg Vorrichtung zum absaugen von abfallprodukten einer produktionsmaschine mit einem absaugelement

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU776963B2 (en) * 1999-08-11 2004-09-30 Commonwealth Scientific And Industrial Research Organisation A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material
AUPQ215599A0 (en) * 1999-08-11 1999-09-02 Commonwealth Scientific And Industrial Research Organisation A method of reducing particle build-up on a surface located within a recess of a conduit carrying particulate material
CN110015569B (zh) * 2019-04-17 2021-07-27 西昌市蓝鼎环保科技有限公司 一种通过气力喷射的脱硫副产物外排控制系统

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1512322A (en) * 1922-09-11 1924-10-21 Halbert C Wallace Fan blower
US3205016A (en) * 1962-12-11 1965-09-07 Blower Applic Company Conveyors
US3321251A (en) * 1963-06-11 1967-05-23 Neu Ets Apparatus for pneumatically conveying fibrous material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1512322A (en) * 1922-09-11 1924-10-21 Halbert C Wallace Fan blower
US3205016A (en) * 1962-12-11 1965-09-07 Blower Applic Company Conveyors
US3321251A (en) * 1963-06-11 1967-05-23 Neu Ets Apparatus for pneumatically conveying fibrous material

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4474511A (en) * 1980-12-10 1984-10-02 Molins Limited Continuous tobacco feed
EP1026107A1 (en) * 1999-02-05 2000-08-09 Agritec S.r.l. Joint for pipelines for pneumatic transportation of loose materials
WO2014037206A1 (de) * 2012-09-04 2014-03-13 Windmöller & Hölscher Kg Vorrichtung zum absaugen von abfallprodukten einer produktionsmaschine
WO2014037207A1 (de) * 2012-09-04 2014-03-13 Windmöller & Hölscher Kg Vorrichtung zum absaugen von abfallprodukten einer produktionsmaschine mit einem absaugelement
US20150224698A1 (en) * 2012-09-04 2015-08-13 Windmöller & Hölscher Kg Device for suctioning off waste products from a production machine
US9446548B2 (en) * 2012-09-04 2016-09-20 Windmöller & Hölscher Kg Device for suctioning off waste products from a production machine
US9764896B2 (en) 2012-09-04 2017-09-19 Windmöller & Hölscher Kg Device for suctioning off waste products from a production machine, comprising a suction element

Also Published As

Publication number Publication date
FR2185569B1 (enrdf_load_stackoverflow) 1977-02-11
FR2185569A1 (enrdf_load_stackoverflow) 1974-01-04
SE401159B (sv) 1978-04-24
CA975823A (en) 1975-10-07
JPS5342956B2 (enrdf_load_stackoverflow) 1978-11-15
NL7306912A (enrdf_load_stackoverflow) 1973-11-26
GB1406951A (en) 1975-09-17
DE2326011A1 (de) 1973-12-20
JPS4949384A (enrdf_load_stackoverflow) 1974-05-13

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