[go: up one dir, main page]

US3799502A - Adjustable venturi throat for the purification of blast furnace gases - Google Patents

Adjustable venturi throat for the purification of blast furnace gases Download PDF

Info

Publication number
US3799502A
US3799502A US00269924A US26992472A US3799502A US 3799502 A US3799502 A US 3799502A US 00269924 A US00269924 A US 00269924A US 26992472 A US26992472 A US 26992472A US 3799502 A US3799502 A US 3799502A
Authority
US
United States
Prior art keywords
dampers
throat
unmounted
damper
venturi apparatus
Prior art date
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
Application number
US00269924A
Inventor
J Baum
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.)
Verfahrenstechnik Dr Ing Kurt Baum
Original Assignee
Verfahrenstechnik Dr Ing Kurt Baum
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Verfahrenstechnik Dr Ing Kurt Baum filed Critical Verfahrenstechnik Dr Ing Kurt Baum
Application granted granted Critical
Publication of US3799502A publication Critical patent/US3799502A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/002—Evacuating and treating of exhaust gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/10—Venturi scrubbers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting

Definitions

  • ABSTRACT This disclosure teaches an adjustable venturi throat for dust purification of blast furnace gases, operating at up to sonic velocities with a substantially constant pressure drop, adjusted by dampers having a length of approximately one half the width of the throat. ln a preferred embodiment the dampers are streamlined in shape, with the narrower ends swinging in mirror images to form a nozzle curve. The ends may be adapted to form a roller-type closure when the dampers are fully closed.
  • Adjustable venturi throats which are known, for instance, for purification of blast furnace gases permit adaptation to varying gas flows while maintaining a constant pressure loss. They have long throat dampers with a closing angle of from to and a practically linear control characteristic. With these dampers a very small angle of rotation effects a considerable change in cross section of the throat. Such a characteristic is unsuitable when operating with very high velocities which can rise up to the sonic region because the control can reverse in an instable region. This region can neither be avoided nor controlled when using the known dampers. The degree of dust removal decreases in this region down to values which are unusable.
  • the present invention solves the problem of creating a venturi throat with dampers which, within the region of the speed of sound, assure sensitive control necessaryin that region.
  • dampers in such a manner that large angles of rotation change the cross section of the throat only slightly.
  • the new venturi throat is so developed that dampers of a length which corresponds approximately to half the width of the throat of the venturi serve to control the cross section of the throat of venturi dust precipitators which are operated up to the region of the velocity of sound.
  • a further feature consists of streamlined dampers the outer edges of which swing as mirror images to each the throat dampers form a part of the wall of the venturi.
  • throat dampers are adjustable, for instance by means of bayonet guides.
  • the new invention results in substantial advances in the art.
  • the increase of the flow in the venturi to sonic speed increases the degree of dust removal considerably and improves the size of particles which can be separated to submicroscopic smallness. Breaking down of pressure or pressure control effect is considerable at these high speeds.
  • the reaction on the control of the pressure in the throat of a blast furnace is in accordance herewith.
  • the new throat dampers have an extremely short, compact construction, as well as a small angle of closure. However, they may be developed also for longitu dinal displacement and then, if necessary, can be adapted subsequently to desired control tasks.
  • FIG. 1 shows the fundamental relationship between damper length and control characteristic.
  • FIG. 2 serves to explain the special control characteristic of the new invention.
  • FIG. 3 shows control characteristics for different damper lengths compared with each other.
  • FIG. 4 is a diagrammatic longitudinal section through an illustrative new throat.
  • FIG. 5 is a cross section through a throat damper in extended condition.
  • FIG. 6 is a cross section corresponding to FIG. 5 with the damper in retracted condition.
  • FIG. 2 reflects this mathematical relationship with respect to the throat dampers in the dimensions in accordance with the invention in order to show the higher value of use corresponding to the derivation.
  • FIG. 3 shows this result in particular for the region of high speeds.
  • a mirror-image arrangement of short throat dampers l is installed swingably in corresponding recesses of a venturi throat 3 as venturis 4 in such a manner that upon complete opening of the dampers the wall 8 of the venturi throat is continued in flush and smooth fashion and continues into the inner wall of the dampers 7.
  • the dampers are shown in dotted line, as can be noted from FIG. 4.
  • the dampers 1 have a length 2 which corresponds to about half the width of the throat 4. It can furthermore be noted in FIG. 4 that the dampers 1 are of streamlined contour. Their outer edges 5 swing as mirror images to each other to form a nozzle curve 6. Furthermore, FIG. v4 shows that the throat dampers 1 have a closure angle of between 60 and 90. In their closed position, the throat dampers roll on each other in the manner of a roller-type closure.
  • FIGS. 5 and 6 show, on an enlarged scale, a throat damper 1 in an embodiment which is enlarged as compared with FIG. 4. It can be seen that the dampers l are divided in two parts. The front ends 5 of the dampers are supported by means of a bayonet guide 9 for longitudinal displacement in the rear swing ends so that the length 2 can be considerably increased or reduced without the shape or the mechanical strength of the damper being impaired.
  • the longitudinal displaceability of the control dampers can also be achieved by other means well known to the man skilled in the art.
  • a venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the damp ers having an adjustable length equal at its maximum to approximately one half the width of the throat.
  • each of the dampers is streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivot in mirrorimage relationships, positioning of the unmounted ends creating the throat.
  • a venturi apparatus with the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.
  • a venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat, each of the dampers streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivoting in mirror-image relationships, positioning of the unmounted ends creating the throat, the dampers having a closure angle of between 60 and 90, the unmounted end of each damper adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure, the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lift Valve (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

This disclosure teaches an adjustable venturi throat for dust purification of blast furnace gases, operating at up to sonic velocities with a substantially constant pressure drop, adjusted by dampers having a length of approximately one half the width of the throat. In a preferred embodiment the dampers are streamlined in shape, with the narrower ends swinging in mirror images to form a nozzle curve. The ends may be adapted to form a rollertype closure when the dampers are fully closed.

Description

United States Patent [1 1 Baum [111 3,799,502 [451 Mar. 26, 1974 1 1 ADJUSTABLE VENTURI THROAT FOR THE PURIFICATION OF BLAST FURNACE GASES [75] lnventor:
[73] Assignee: Verfahrenstechnik Dr.-lng. Kurt Baum, Essen, Germany [22] Filed: July 10, 1972 [21] Appl. No.: 269,924
Jiirg Peter Baum, Essen, Germany [30] Foreign Application Priority Data July 17, 1971 Germany 2135840 [52] US. Cl 251/124, 251/212, 266/15, 266/31 [51] Int. Cl. F16k 47/00 [58] Field of Search 251/124, 212, 298, 308; 137/527; 266/15, 16,17, 30, 31
[5 6] References Cited UNITED STATES PATENTS 3,160,385 I 12/1964 Dicesare; 251/212 X 1,357,440 11/1920 Britcher 251/298 1,543,637 6/1925 W011 251/212 X 2,067,120 1/1937 George 251/212 X 3,378,226 4/1968 Naundorf et a1 251/124 X 3,444,669 5/1969 Panzica et a1 266/15 X Primary Examiner-Henry T. Klinltsiek Attorney, Agent, or Firm-Charles E. Baxley, Esq.
[5 7] ABSTRACT This disclosure teaches an adjustable venturi throat for dust purification of blast furnace gases, operating at up to sonic velocities with a substantially constant pressure drop, adjusted by dampers having a length of approximately one half the width of the throat. ln a preferred embodiment the dampers are streamlined in shape, with the narrower ends swinging in mirror images to form a nozzle curve. The ends may be adapted to form a roller-type closure when the dampers are fully closed.
6 Claims, 6 Drawing Figures BACKGROUND OF THE INVENTION Adjustable venturi throats which are known, for instance, for purification of blast furnace gases permit adaptation to varying gas flows while maintaining a constant pressure loss. They have long throat dampers with a closing angle of from to and a practically linear control characteristic. With these dampers a very small angle of rotation effects a considerable change in cross section of the throat. Such a characteristic is unsuitable when operating with very high velocities which can rise up to the sonic region because the control can reverse in an instable region. This region can neither be avoided nor controlled when using the known dampers. The degree of dust removal decreases in this region down to values which are unusable.
The present invention solves the problem of creating a venturi throat with dampers which, within the region of the speed of sound, assure sensitive control necessaryin that region. In accordance with the invention it is possible to develop dampers in such a manner that large angles of rotation change the cross section of the throat only slightly. In this way there is solved simultaneously the problem of regulating the pressure rapidly and precisely in the region of the speed of sound in such a manner that a higher pressure loss than that necessary for purification of the gas is continuously done away with.
With the aid of the new dampers, therefore, when used behind blast furnaces, pressure in the blast furnace throat is also indirectly controlled.
In order to achieve the objects desired, the new venturi throat is so developed that dampers of a length which corresponds approximately to half the width of the throat of the venturi serve to control the cross section of the throat of venturi dust precipitators which are operated up to the region of the velocity of sound.
A further feature consists of streamlined dampers the outer edges of which swing as mirror images to each the throat dampers form a part of the wall of the venturi.
Another improvement resides in the fact that the lengths of the throat dampers are adjustable, for instance by means of bayonet guides.
The new invention results in substantial advances in the art. The increase of the flow in the venturi to sonic speed increases the degree of dust removal considerably and improves the size of particles which can be separated to submicroscopic smallness. Breaking down of pressure or pressure control effect is considerable at these high speeds. The reaction on the control of the pressure in the throat of a blast furnace is in accordance herewith.
The new throat dampers have an extremely short, compact construction, as well as a small angle of closure. However, they may be developed also for longitu dinal displacement and then, if necessary, can be adapted subsequently to desired control tasks.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows the fundamental relationship between damper length and control characteristic.
FIG. 2 serves to explain the special control characteristic of the new invention.
FIG. 3 shows control characteristics for different damper lengths compared with each other.
FIG. 4 is a diagrammatic longitudinal section through an illustrative new throat.
FIG. 5 is a cross section through a throat damper in extended condition.
FIG. 6 is a cross section corresponding to FIG. 5 with the damper in retracted condition.
DESCRIPTION OF PREFERRED EMBODIMENT In detail, from FIG. 1 there can be noted the fundamental formula relationship between the length of a control damper of any desired shape with respect to its control characteristic in accordance with the following derivation.
Derivation of the control characteristic (for any desired length of damper) F=2-c-sinBmax-h F, 2 b L b a max a B=2-c'sinBmax F, F (1 sin B)/sin B max For sin max FIG. 2 reflects this mathematical relationship with respect to the throat dampers in the dimensions in accordance with the invention in order to show the higher value of use corresponding to the derivation.
The derivation of the control characteristic (for damper length one-half throat length):
sin [3 a/c a c sin B F B L 2 c" L FIG. 3 shows this result in particular for the region of high speeds.
In the practical but illustrative embodiment of FIG. 4, a mirror-image arrangement of short throat dampers l is installed swingably in corresponding recesses of a venturi throat 3 as venturis 4 in such a manner that upon complete opening of the dampers the wall 8 of the venturi throat is continued in flush and smooth fashion and continues into the inner wall of the dampers 7. The dampers are shown in dotted line, as can be noted from FIG. 4.
The dampers 1 have a length 2 which corresponds to about half the width of the throat 4. It can furthermore be noted in FIG. 4 that the dampers 1 are of streamlined contour. Their outer edges 5 swing as mirror images to each other to form a nozzle curve 6. Furthermore, FIG. v4 shows that the throat dampers 1 have a closure angle of between 60 and 90. In their closed position, the throat dampers roll on each other in the manner of a roller-type closure.
The rest of the development of the venturi throat is conventional; therefore, it is not necessary to describe it specifically.
FIGS. 5 and 6 show, on an enlarged scale, a throat damper 1 in an embodiment which is enlarged as compared with FIG. 4. It can be seen that the dampers l are divided in two parts. The front ends 5 of the dampers are supported by means of a bayonet guide 9 for longitudinal displacement in the rear swing ends so that the length 2 can be considerably increased or reduced without the shape or the mechanical strength of the damper being impaired. The longitudinal displaceability of the control dampers can also be achieved by other means well known to the man skilled in the art.
It will be evident to those skilled in the art that various deviations may be made from the foregoing preferred embodiment without departing from the main theme of invention set forth in the following claims.
I claim:
1. A venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the damp ers having an adjustable length equal at its maximum to approximately one half the width of the throat.
2. A venturi apparatus according to claim 1 wherein each of the dampers is streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivot in mirrorimage relationships, positioning of the unmounted ends creating the throat.
3. A venturi-apparatus according to claim 2 wherein the dampers have a closure angle of between 60 and 4. A venturi apparatus according to claim 3 wherein the unmounted end of each damper is adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure.
5. A venturi apparatus according to claim 4 with the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.
6. A venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat, each of the dampers streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivoting in mirror-image relationships, positioning of the unmounted ends creating the throat, the dampers having a closure angle of between 60 and 90, the unmounted end of each damper adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure, the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.

Claims (6)

1. A venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat.
2. A venturi apparatus according to claim 1 wherein each of the dampers is streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivot in mirror-image relationships, positioning of the unmounted ends creating the throat.
3. A venturi apparatus according to claim 2 wherein the dampers have a closure angle of between 60* and 90*.
4. A venturi apparatus according to claim 3 wherein the unmounted end of each damper is adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure.
5. A venturi apparatus according to claim 4 with the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.
6. A venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat, each of the dampers streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivoting in mirror-image relationships, positioning of the unmounted ends creating the throat, the dampers having a closure angle of between 60* and 90*, the unmounted end of each damper adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure, the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.
US00269924A 1971-07-17 1972-07-10 Adjustable venturi throat for the purification of blast furnace gases Expired - Lifetime US3799502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2135840A DE2135840A1 (en) 1971-07-17 1971-07-17 ADJUSTABLE VENTURAL HEAD FOR CLEANING FURNACE GAS

Publications (1)

Publication Number Publication Date
US3799502A true US3799502A (en) 1974-03-26

Family

ID=5814014

Family Applications (1)

Application Number Title Priority Date Filing Date
US00269924A Expired - Lifetime US3799502A (en) 1971-07-17 1972-07-10 Adjustable venturi throat for the purification of blast furnace gases

Country Status (3)

Country Link
US (1) US3799502A (en)
DE (1) DE2135840A1 (en)
FR (1) FR2146280B1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007025A (en) * 1973-11-06 1977-02-08 Gottfried Bischoff Bau Kompl. Apparatus for cleaning stack gas and using same for generation of electric power
US4300749A (en) * 1979-12-13 1981-11-17 Allis-Chalmers Corporation Throttle valve
US5010915A (en) * 1990-06-06 1991-04-30 Ebw, Inc. Two stage automatic shut off valve
US5095937A (en) * 1990-06-06 1992-03-17 Ebw, Inc. Two stage automatic shut off valve
US5141019A (en) * 1990-06-06 1992-08-25 Ebw, Inc. Two stage automatic shutoff valve
US5241989A (en) * 1986-05-30 1993-09-07 Plattco Corporation Reduced height double flap dust valve
US5388622A (en) * 1993-11-03 1995-02-14 Ebw, Inc. Automatic shutoff valve
US6959690B1 (en) * 2004-08-27 2005-11-01 Harlie David Reynard Four quarter butterfly valve system
US20090235905A1 (en) * 2007-09-25 2009-09-24 Mann+Hummel Gmbh Device for swirling and mixing exhaust gases recycled in the intake duct of an internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8713583U1 (en) * 1987-10-09 1989-02-09 Thyssen Industrie Ag, 4300 Essen Venturi cooler for a flue gas desulphurisation device

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357440A (en) * 1919-11-20 1920-11-02 Morgan Smith S Co Wicket-gate for water-wheels
US1543637A (en) * 1923-04-05 1925-06-23 John M Woll Device for controlling the flow of wells
US2067120A (en) * 1936-03-17 1937-01-05 Myrtle B George Rhythmic inhaler
US3160385A (en) * 1961-09-21 1964-12-08 Greenawalt Sintering Co Inc Suction valve for sintering machine
US3378226A (en) * 1963-11-13 1968-04-16 Charles H. Naundorf High pressure fluid flow measurement and/or control
US3444669A (en) * 1964-06-23 1969-05-20 Ajem Lab Inc High capacity gas washer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357440A (en) * 1919-11-20 1920-11-02 Morgan Smith S Co Wicket-gate for water-wheels
US1543637A (en) * 1923-04-05 1925-06-23 John M Woll Device for controlling the flow of wells
US2067120A (en) * 1936-03-17 1937-01-05 Myrtle B George Rhythmic inhaler
US3160385A (en) * 1961-09-21 1964-12-08 Greenawalt Sintering Co Inc Suction valve for sintering machine
US3378226A (en) * 1963-11-13 1968-04-16 Charles H. Naundorf High pressure fluid flow measurement and/or control
US3444669A (en) * 1964-06-23 1969-05-20 Ajem Lab Inc High capacity gas washer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007025A (en) * 1973-11-06 1977-02-08 Gottfried Bischoff Bau Kompl. Apparatus for cleaning stack gas and using same for generation of electric power
US4300749A (en) * 1979-12-13 1981-11-17 Allis-Chalmers Corporation Throttle valve
US5241989A (en) * 1986-05-30 1993-09-07 Plattco Corporation Reduced height double flap dust valve
US5010915A (en) * 1990-06-06 1991-04-30 Ebw, Inc. Two stage automatic shut off valve
US5095937A (en) * 1990-06-06 1992-03-17 Ebw, Inc. Two stage automatic shut off valve
US5141019A (en) * 1990-06-06 1992-08-25 Ebw, Inc. Two stage automatic shutoff valve
US5388622A (en) * 1993-11-03 1995-02-14 Ebw, Inc. Automatic shutoff valve
US6959690B1 (en) * 2004-08-27 2005-11-01 Harlie David Reynard Four quarter butterfly valve system
US20090235905A1 (en) * 2007-09-25 2009-09-24 Mann+Hummel Gmbh Device for swirling and mixing exhaust gases recycled in the intake duct of an internal combustion engine

Also Published As

Publication number Publication date
DE2135840A1 (en) 1973-02-08
FR2146280B1 (en) 1977-04-01
FR2146280A1 (en) 1973-03-02

Similar Documents

Publication Publication Date Title
US3799502A (en) Adjustable venturi throat for the purification of blast furnace gases
RU2069782C1 (en) Thrust reverser of turbojet engine
CN110370894A (en) Air outlet for vehicle
CN110056957A (en) Air conditioner indoor unit, air outlet control method thereof and air conditioner
GB1527907A (en) Gas outlet
US2372030A (en) Rotary wing aircraft
CN208936224U (en) Fume exhaust fan
WO2021027255A1 (en) Air duct structure and air treatment apparatus
CN108128121A (en) A kind of wind direction regulating device
US2201437A (en) Volume control for fans
US2082335A (en) Control register for air conditioning apparatus
CN206786088U (en) Block-proof type fluidization powder overflow valve plate
CN219030718U (en) A powder material conveying device with diverting conveying function
CN107387260B (en) Design method of bypass passive pneumatic vectoring nozzle with sliding switch and its sliding switch
JP3988577B2 (en) Fluid blowing nozzle
US2742324A (en) Hydraulic discharge regulators
CN218096241U (en) an air conditioner
US3599952A (en) High-velocity tuyere with variable size cooling medium passage
CN207879408U (en) A kind of turbo charged dust-proof pressure shell
GB1386049A (en) Variable throat venturi scrubber
JPH08145320A (en) Pulverized coal burner
US3180140A (en) Variable contour nozzle
CN112923546B (en) Rail transit vent silencer
US4207018A (en) Fluid pressurizing station for a pipeline conveyor
JPS5773345A (en) Air supply port for duct capable of changing air stream