WO1990008083A1 - Ejector with peripheral supply of propellent gas - Google Patents
Ejector with peripheral supply of propellent gas Download PDFInfo
- Publication number
- WO1990008083A1 WO1990008083A1 PCT/SE1990/000015 SE9000015W WO9008083A1 WO 1990008083 A1 WO1990008083 A1 WO 1990008083A1 SE 9000015 W SE9000015 W SE 9000015W WO 9008083 A1 WO9008083 A1 WO 9008083A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ejector
- insert
- housing
- propellent gas
- nozzles
- Prior art date
Links
Classifications
-
- 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
- B65G53/40—Feeding or discharging devices
- B65G53/42—Nozzles
-
- 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
- B65G53/58—Devices for accelerating or decelerating flow of the materials; Use of pressure generators
Definitions
- the invention relates to an ejector intended for a pneuma ⁇ tic transport device for particulate material, especially erosive material.
- the diffusor is formed with nozzles 5 through which propellent gas is supplied peripherally in the flow channel of the ejector.
- An ejector with peripheral supply of propellent gas in a pneumatic conveying pipe for particulate material is known TO from UK Patent Specification 2 002 312 A.
- Ejectors with peripheral supply of propellent gas in nozzles for blasting and surface coating are known from European Patent Specifi ⁇ cation 0 189 709 and International Patent Application 0 86/02587, respectively.
- One object of the invention is to provide an ejector with high power and low consumption of propellent gas. Another object is to give an ejector such a design that the erosion therein becomes insignificant.
- the ejector is provided with a number of peripherally arranged nozzles around a central flow channel. These nozzles are formed from an ejector housing and and insert forming part of the flow channel in the ejector.
- the ejector housing is formed with
- a conical seat and the insert with an outer conical surface contiguous to the seat Suitably, recesses in the conical surface of the insert and the surrounding surface in the conical seat in the ejector housing form a nozzle channel.
- the recess can be made in the seat of the ejector housing, which, however, is more complicated from the manufacturing point of view.
- the nozzle channel From an inlet for propellent gas, the nozzle channel has a continuously increasing cross section and forms a diffusor where the propellent gas expands and attains a very high velocity which provides a great driving power.
- Figure 1 shows a longitudinal section through an ejector
- FIG. 2 a section according to A-A in Figure 1 ,
- FIG. 3 shows a section at B-B in Figure 1
- Figure 4 shows on an enlarged scale a portion of the sec ⁇ tion according to Figure 1 .
- Figure 5 shows an extension of a conical insert, included in the ejector, with milled-out portions forming nozzles and diffusor channels.
- 1 designates an ejector in a pneumatic transport device between an upstream suction pipe 2 and a downstream conveying pipe 3.
- the ejector comprises an ejector housing 4 with a propellent gas inlet 5 and a sleeve-formed insert 6.
- the housing 4 is formed with a conical seat 7 and the insert 6 with an external conical portion 6a adapted to the insert 6.
- the sleeve or insert 6 is fixed with its flange 6b in the housing 4 by the suc- tion pipe 2.
- the propellent gas channel 8 of the inlet 5 opens out into an- annular space 9 formed by an annular tur ⁇ ned cavity in the housing 4 and by the flange 6b of the sleeve/insert 6.
- milled grooves are provided which together with the housing 4, which surrounds the sleeve 6, form flow channels 10.
- the inlet 10a communicates with the annular space 9 and the outlet with the opening 11 in the housing 4.
- These channels 10 have a cross section increasing from the inlet 10a towards the outlet 10b and form Laval nozzles where the gas, after the smallest cross section at the inlet, is accelerated by expansion to a very high velocity in the channel serving as a diffusor and provided downstream of the inlet.
- This channel opens out at the periphery of the flow channel 11.
- the high velocity of the propellent gas gives a very high driving power with a small quantity of gas.
- the channels are suitably formed such that their centre line makes a certain angle of with a plane extending through the longitudinal axis of the ejector.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention relates to an ejector for a pneumatic transport system with nozzles for the propellent gas which open out peripherally. It comprises a housing (4) with a conical insert (6). Recesses in the insert and the surrounding surface in the ejector housing from a channel (10) with a cross section (diffusor) which continuously increases from an inlet (10a) for the propellent gas, where the propellent gas expands and attains a high velocity. These channels (10) open out at the periphery in the flow channel of the ejector and constitute the nozzles of the ejector.
Description
Ejector with peripheral supply of propellent gas
TECHNICAL FIELD
The invention relates to an ejector intended for a pneuma¬ tic transport device for particulate material, especially erosive material. The diffusor is formed with nozzles 5 through which propellent gas is supplied peripherally in the flow channel of the ejector.
BACKGROUND ART
An ejector with peripheral supply of propellent gas in a pneumatic conveying pipe for particulate material is known TO from UK Patent Specification 2 002 312 A. Ejectors with peripheral supply of propellent gas in nozzles for blasting and surface coating are known from European Patent Specifi¬ cation 0 189 709 and International Patent Application 0 86/02587, respectively.
15 SUMMARY OF THE INVENTION
--- One object of the invention is to provide an ejector with high power and low consumption of propellent gas. Another object is to give an ejector such a design that the erosion therein becomes insignificant.
20 According to the invention the ejector is provided with a number of peripherally arranged nozzles around a central flow channel. These nozzles are formed from an ejector housing and and insert forming part of the flow channel in the ejector. Suitably, the ejector housing is formed with
25 a conical seat and the insert with an outer conical surface contiguous to the seat. Suitably, recesses in the conical surface of the insert and the surrounding surface in the conical seat in the ejector housing form a nozzle channel. The recess can be made in the seat of the ejector housing,
which, however, is more complicated from the manufacturing point of view. From an inlet for propellent gas, the nozzle channel has a continuously increasing cross section and forms a diffusor where the propellent gas expands and attains a very high velocity which provides a great driving power.
BRIEF DESCRIPTION OF THE DRAWING
Figure 1 shows a longitudinal section through an ejector,
Figure 2 a section according to A-A in Figure 1 ,
Figure 3 shows a section at B-B in Figure 1,
Figure 4 shows on an enlarged scale a portion of the sec¬ tion according to Figure 1 , and
Figure 5 shows an extension of a conical insert, included in the ejector, with milled-out portions forming nozzles and diffusor channels.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the figures, 1 designates an ejector in a pneumatic transport device between an upstream suction pipe 2 and a downstream conveying pipe 3. The ejector comprises an ejector housing 4 with a propellent gas inlet 5 and a sleeve-formed insert 6. The housing 4 is formed with a conical seat 7 and the insert 6 with an external conical portion 6a adapted to the insert 6. The sleeve or insert 6 is fixed with its flange 6b in the housing 4 by the suc- tion pipe 2. The propellent gas channel 8 of the inlet 5 opens out into an- annular space 9 formed by an annular tur¬ ned cavity in the housing 4 and by the flange 6b of the sleeve/insert 6.
In the outer surface of the conical part 6a of the sleeve 6
milled grooves are provided which together with the housing 4, which surrounds the sleeve 6, form flow channels 10. The inlet 10a communicates with the annular space 9 and the outlet with the opening 11 in the housing 4. These channels 10 have a cross section increasing from the inlet 10a towards the outlet 10b and form Laval nozzles where the gas, after the smallest cross section at the inlet, is accelerated by expansion to a very high velocity in the channel serving as a diffusor and provided downstream of the inlet. This channel opens out at the periphery of the flow channel 11. The high velocity of the propellent gas gives a very high driving power with a small quantity of gas. Since the propellent gas is supplied peripherally in the ejector, particles are prevented from hitting the wall in the ejector passageway 11 and the wall in the pipe nearest the diffusor where the particle velocity may become very high. To achieve a better mixing between propellent gas and particulate material to be transported, the channels are suitably formed such that their centre line makes a certain angle of with a plane extending through the longitudinal axis of the ejector.
Claims
1. An ejector for a pneumatic transport system, especially intended for erosive particulate material such as ashes, bed material or the like in a combustion plant for combus¬ tion of a solid fuel such as coal, c h a r a c t e r i ¬ z e d in that it comprises an ejector housing (4) with a tubular insert (6) forming part of the flow channel (11) in the ejector (1), and that flow channels (10) are provided between the ejector housing (4) and the insert (6), said flow channnels (10) having a cross section (diffusor) which continuously increases from a propellent gas inlet (10a) and form nozzles opening out at the periphery in the flow channel (11) through the ejector (1).
2. An ejector according to claim 1, c h a r a c t e r i ¬ z e d in that recesses inside the seat (7) of the ejec¬ tor housing (4) and the insert (6) or recesses externally in the insert (6) and the seat (7) form the flow channels or the nozzles (10).
3. An ejector according to claim 2, c h a r a c t e r i ¬ z e d in that the housing (4) is formed with a conical seat (7) for an externally conical insert".
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8900076-4 | 1989-01-11 | ||
SE8900076A SE462796B (en) | 1989-01-11 | 1989-01-11 | EJECTOR WITH PERIPHERAL SUPPLY OF FUEL GAS |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1990008083A1 true WO1990008083A1 (en) | 1990-07-26 |
Family
ID=20374716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1990/000015 WO1990008083A1 (en) | 1989-01-11 | 1990-01-10 | Ejector with peripheral supply of propellent gas |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0453478A1 (en) |
SE (1) | SE462796B (en) |
WO (1) | WO1990008083A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0456931A1 (en) * | 1990-05-18 | 1991-11-21 | Kiyoshi Horii | Coanda spiral flow device |
US6036407A (en) * | 1997-09-03 | 2000-03-14 | Exxon Chemical Patents Inc. | Solids conveying system for compacted, friable solids that can not be pushed or compressed |
WO2000017079A1 (en) * | 1998-09-23 | 2000-03-30 | Exxon Chemical Patents Inc. | Pneumatic conveying system for compacted, friable solids |
US6368028B1 (en) | 1997-09-03 | 2002-04-09 | Exxonmobil Chemical Patents Inc. | Conveying systems for compacted, friable solids |
WO2004011185A1 (en) * | 2002-07-26 | 2004-02-05 | Honeywell International Inc. | Powder feed splitter for hand-held laser powder fusion welding torch |
EP2812625A4 (en) * | 2012-02-07 | 2016-01-13 | Commw Scient Ind Res Org | Reducing friction of a viscous fluid flow in a conduit |
US20180257796A1 (en) * | 2011-07-11 | 2018-09-13 | Altria Client Services Llc | Delivery apparatus |
WO2019017580A1 (en) * | 2017-07-17 | 2019-01-24 | 장희수 | Waterjet ejector for transferring object |
CN110562746A (en) * | 2019-09-30 | 2019-12-13 | 安徽百盛源包装材料有限公司 | Edge-suction thread airflow adjusting device of film coating machine |
CN114086332A (en) * | 2020-08-24 | 2022-02-25 | 高林股份有限公司 | Residual scrap collecting device of sewing machine and negative pressure joint thereof |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3708207A (en) * | 1971-04-16 | 1973-01-02 | Dynamic Air | High pressure booster valve |
DE2516402A1 (en) * | 1975-04-15 | 1976-10-28 | Lutz Tilo Dipl Ing Kayser | Powdery material continuous conveyor - has material metering unit coaxial to mixing chamber on upstream side |
EP0063960A2 (en) * | 1981-04-28 | 1982-11-03 | Joshua Bigwood & Son Limited | Improvements relating to apparatus for the conveying of particulate material |
WO1986002587A1 (en) * | 1984-10-29 | 1986-05-09 | Hardblast Australia Pty. Ltd. | Nozzle for sand blasting |
EP0189709A1 (en) * | 1985-01-04 | 1986-08-06 | Saint Gobain Vitrage International | Pneumatic powder injector |
WO1988004220A1 (en) * | 1986-12-03 | 1988-06-16 | K.G. McCOLL & COMPANY LIMITED | Method and apparatus for wet abrasive blasting |
-
1989
- 1989-01-11 SE SE8900076A patent/SE462796B/en not_active IP Right Cessation
-
1990
- 1990-01-10 EP EP90901918A patent/EP0453478A1/en not_active Withdrawn
- 1990-01-10 WO PCT/SE1990/000015 patent/WO1990008083A1/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3708207A (en) * | 1971-04-16 | 1973-01-02 | Dynamic Air | High pressure booster valve |
DE2516402A1 (en) * | 1975-04-15 | 1976-10-28 | Lutz Tilo Dipl Ing Kayser | Powdery material continuous conveyor - has material metering unit coaxial to mixing chamber on upstream side |
EP0063960A2 (en) * | 1981-04-28 | 1982-11-03 | Joshua Bigwood & Son Limited | Improvements relating to apparatus for the conveying of particulate material |
WO1986002587A1 (en) * | 1984-10-29 | 1986-05-09 | Hardblast Australia Pty. Ltd. | Nozzle for sand blasting |
EP0189709A1 (en) * | 1985-01-04 | 1986-08-06 | Saint Gobain Vitrage International | Pneumatic powder injector |
WO1988004220A1 (en) * | 1986-12-03 | 1988-06-16 | K.G. McCOLL & COMPANY LIMITED | Method and apparatus for wet abrasive blasting |
Non-Patent Citations (1)
Title |
---|
DERWENT'S ABSTRACT, No. 87-241 500/34, SU 128 3197 publ. week 8734. * |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU640943B2 (en) * | 1990-05-18 | 1993-09-09 | Kiyoshi Horii | Coanda spiral flow unit |
EP0456931A1 (en) * | 1990-05-18 | 1991-11-21 | Kiyoshi Horii | Coanda spiral flow device |
US6036407A (en) * | 1997-09-03 | 2000-03-14 | Exxon Chemical Patents Inc. | Solids conveying system for compacted, friable solids that can not be pushed or compressed |
US6368028B1 (en) | 1997-09-03 | 2002-04-09 | Exxonmobil Chemical Patents Inc. | Conveying systems for compacted, friable solids |
WO2000017079A1 (en) * | 1998-09-23 | 2000-03-30 | Exxon Chemical Patents Inc. | Pneumatic conveying system for compacted, friable solids |
WO2004011185A1 (en) * | 2002-07-26 | 2004-02-05 | Honeywell International Inc. | Powder feed splitter for hand-held laser powder fusion welding torch |
US6894247B2 (en) | 2002-07-26 | 2005-05-17 | Honeywell International, Inc. | Powder feed splitter for hand-held laser powder fusion welding torch |
US20180257796A1 (en) * | 2011-07-11 | 2018-09-13 | Altria Client Services Llc | Delivery apparatus |
US11618596B2 (en) * | 2011-07-11 | 2023-04-04 | Altria Client Services Llc | Method of making delivery apparatus |
US11027860B2 (en) * | 2011-07-11 | 2021-06-08 | Altria Client Services Llc | Delivery apparatus |
AU2013218791B2 (en) * | 2012-02-07 | 2017-07-06 | Commonwealth Scientific And Industrial Research Organisation | Reducing friction of a viscous fluid flow in a conduit |
US9759386B2 (en) | 2012-02-07 | 2017-09-12 | Commonwealth Scientific And Industrial Research Organisation | Reducing friction of a viscous fluid flow in a conduit |
EP2812625A4 (en) * | 2012-02-07 | 2016-01-13 | Commw Scient Ind Res Org | Reducing friction of a viscous fluid flow in a conduit |
WO2019017580A1 (en) * | 2017-07-17 | 2019-01-24 | 장희수 | Waterjet ejector for transferring object |
KR20190008730A (en) * | 2017-07-17 | 2019-01-25 | 장희수 | Waterjet ejector for object transport |
KR101978982B1 (en) * | 2017-07-17 | 2019-05-15 | 장희수 | Waterjet ejector for object transport |
CN110562746A (en) * | 2019-09-30 | 2019-12-13 | 安徽百盛源包装材料有限公司 | Edge-suction thread airflow adjusting device of film coating machine |
CN110562746B (en) * | 2019-09-30 | 2021-06-18 | 安徽百盛源包装材料有限公司 | Edge-suction thread airflow adjusting device of film coating machine |
CN114086332A (en) * | 2020-08-24 | 2022-02-25 | 高林股份有限公司 | Residual scrap collecting device of sewing machine and negative pressure joint thereof |
Also Published As
Publication number | Publication date |
---|---|
SE8900076D0 (en) | 1989-01-11 |
SE462796B (en) | 1990-09-03 |
EP0453478A1 (en) | 1991-10-30 |
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