WO1995000428A1 - Equipment for metering a powder material from a silo - Google Patents

Equipment for metering a powder material from a silo Download PDF

Info

Publication number
WO1995000428A1
WO1995000428A1 PCT/FI1994/000251 FI9400251W WO9500428A1 WO 1995000428 A1 WO1995000428 A1 WO 1995000428A1 FI 9400251 W FI9400251 W FI 9400251W WO 9500428 A1 WO9500428 A1 WO 9500428A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
flow
silo
equipment
butterfly valve
Prior art date
Application number
PCT/FI1994/000251
Other languages
French (fr)
Inventor
Jan-Peter BJÖRKLUND
Kauno ÖRN
Original Assignee
Optiroc Oy Ab
Raute Precision Oy
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 Optiroc Oy Ab, Raute Precision Oy filed Critical Optiroc Oy Ab
Priority to AU68477/94A priority Critical patent/AU6847794A/en
Publication of WO1995000428A1 publication Critical patent/WO1995000428A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/54—Gates or closures
    • B65D90/62—Gates or closures having closure members movable out of the plane of the opening
    • B65D90/623—Gates or closures having closure members movable out of the plane of the opening having a rotational motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/54—Gates or closures
    • B65D90/64—Gates or closures having multipart closure members, the parts being brought into closing position one by one according to need
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/222—Shaping of the valve member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/52—Means for additional adjustment of the rate of flow

Definitions

  • the object of the invention is an equipment for metering a powder material from a silo.
  • Substances referred to are for instance components for concrete and mortar. In prac ⁇ tice, these substances flow poorly and therefore do not readily leave the silo under the force of gravity; and even if they do, the flow out is quite uneven due to pro- perties such as a tendency to form hangings at the outlet part of the silo.
  • the said outlet part is generally a conical base section of the cylindrical storage silo, the downward pointing extremity of the conical section having an outlet opening for the substance.
  • the Finnish patent number 80430 proposes an outflow cone structure in which the inner walls of the bottom cone are provided with elements via which compressed air can be led into the material to be evacuated. It is recommended that these elements be con ⁇ structed of perforated metal plates welded onto the walls of the cone so that a duct is formed between the plates and the wall for the compressed air or other gas employed as a medium.
  • the said medium is advantageously led via the perforation on the plates which directs the flow of the medium in the desired direction.
  • the material that has thus been brought into a fluidized state has been observed to flow out of the cone in an essentially even manner and without problems with hang ⁇ ing formation.
  • the flow is controlled via a control valve placed at the outlet opening, the said valve being, for example, a known art butterfly valve.
  • the said valve has a vane corresponding to the cross section of the outflow opening, the vane being rotatable around an axle coinci ⁇ dent with the diameter of the outflow opening. It has been observed that the said control valve operates quite satisfactorily as a control valve with high material flow rates. It has also proven to be a reliable and effective shutt-off valve.
  • the invention is based on the idea of providing the primary valve vane with a smaller and inde ⁇ pendently controllable secondary butterfly. This arrange ⁇ ment makes it possible to avoid the formation of the afo ⁇ rementioned gap situation in connection with markedly throttled flows.
  • the throttled flows may be controlled, the main vane in the shutt-off position, using the small ⁇ er diameter valve. In these flow situations the secondary valve may be in an essentially more open position than the main vane in a corresponding situation.
  • Figure 1 is a cross section of the equipment showing the conical outflow section situated at the base of the material silo and of the flow-promoting elements placed in it,
  • FIG. 2 is an illustration of the corresponding equipment as seen from above, and
  • Figure 3 shows three operating positions of the in ⁇ ventive valve.
  • Figure 1 is an illustration of the conical outflow sec ⁇ tion, indicated throughout by the reference number 1, placed in the base section of a silo 17 containing powder material.
  • the bottom section of the cone is provided with an outflow opening 3, the flow through the opening being controlled by means of a valve whose structure is de ⁇ scribed in more detail hereafter.
  • Elements 4, via which compressed air, for example, can be led into the ma ⁇ terial to be evacuated, have been provided onto the in ⁇ ternal walls of the cone 1 in order to promote the flow of the powder material and to prevent the hangings of the material.
  • Air is led in sufficiently to put the material to be evacuated into a readily flowing, fluidized state, but with the flow of air being controlled by means of appropriate flow-constricting devices 11 so that the flow of air is not allowed to discharge upwards through the material to be evacuated when the silo is only partially full, for instance.
  • the said elements 4 are formed of perforated metal plate, for instance, the plate being welded onto the internal wall of the cone l so that a suitable duct is formed be- tween them and the wall 2 of the cone for the compressed air to flow in. Air is led into these ducts via pipes 14, 15, 16 placed at suitable heights. As shown in Fig. 2, there may be four elements 4 evenly distributed around the cone or there may be less of them, for instance three of them. The number of elements may also exceed four.
  • the control valve placed in the flow opening 3 is shown in Fig. 3.
  • the valve comprises a conventional butterfly valve with a rotary vane 5 for shutting off the flow opening.
  • the said vane is placed at the cross section of the flow opening, rotatably around an axle 6 coincident with the diameter of the cross section.
  • the rotary vane 5 is made to house concentrically another rotary vane, the latter vane being smaller in diameter.
  • the operating mechanism of this smaller valve has been executed coaxially with the oper- ating mechanism of the primary valve 5.
  • the rotation shafts 6 and 8 can be rotated independently, which allows different operating positions for the vanes, as for in ⁇ stance depicted in Fig. 3.
  • the operating mechanisms of the vanes 5 and 7 can be placed differently to that shown in Fig. 3, i.e. on the opposite sides of the valve. Similarly, the position of the smaller vane in respect to the primary vane need not be concentric either.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Lift Valve (AREA)

Abstract

The invention relates to an equipment for metering powder material from a silo. The equipment comprises a bottom section having the shape of an inverted cone in the base of a silo containing the material, the extremity of the said bottom section being provided with an outflow opening and its internal walls being provided with devices for blowing air or some other gas medium into the material to be evacuated to promote the outflow of the material, and a butterfly valve located at the outflow opening. The vane (5) of the butterfly valve is provided with a rotary butterfly valve (7) of smaller diameter, the latter valve being opened and shut independently of the larger valve.

Description

Equipment for metering a powder material from a silo
The object of the invention is an equipment for metering a powder material from a silo. Substances referred to are for instance components for concrete and mortar. In prac¬ tice, these substances flow poorly and therefore do not readily leave the silo under the force of gravity; and even if they do, the flow out is quite uneven due to pro- perties such as a tendency to form hangings at the outlet part of the silo. The said outlet part is generally a conical base section of the cylindrical storage silo, the downward pointing extremity of the conical section having an outlet opening for the substance.
In order to ensure a more even and reliable flow via the said conical section, the Finnish patent number 80430 proposes an outflow cone structure in which the inner walls of the bottom cone are provided with elements via which compressed air can be led into the material to be evacuated. It is recommended that these elements be con¬ structed of perforated metal plates welded onto the walls of the cone so that a duct is formed between the plates and the wall for the compressed air or other gas employed as a medium. The said medium is advantageously led via the perforation on the plates which directs the flow of the medium in the desired direction.
The material that has thus been brought into a fluidized state has been observed to flow out of the cone in an essentially even manner and without problems with hang¬ ing formation. The flow is controlled via a control valve placed at the outlet opening, the said valve being, for example, a known art butterfly valve. The said valve has a vane corresponding to the cross section of the outflow opening, the vane being rotatable around an axle coinci¬ dent with the diameter of the outflow opening. It has been observed that the said control valve operates quite satisfactorily as a control valve with high material flow rates. It has also proven to be a reliable and effective shutt-off valve.
However, problems do arise when the flow of material is to be markedly reduced. In such control situations, the rotary valve vane is rotated almost to its shut-off posi¬ tion so that narrow crescent-shaped flow gaps are formed on the opposite sides of the vane. In this situation the flow gap is extremely narrow, especially at the tips of the crescents. These extremely narrow gaps alter the flow properties and cause the disadvantage that the coarser particles of the powder material are not able to flow through this flow section as readily as they are able to flow through the less confined mid-section of the flow path. Consequently the coarse material particles have a tendency to accumulate into the flow opening and they might block the entire outflow opening.
Some materials develop also stable deposits around the narrower part of the outflow opening causing inaccuracy in the flow control.
These problems have been essentially eliminated by the present invention. The invention is based on the idea of providing the primary valve vane with a smaller and inde¬ pendently controllable secondary butterfly. This arrange¬ ment makes it possible to avoid the formation of the afo¬ rementioned gap situation in connection with markedly throttled flows. The throttled flows may be controlled, the main vane in the shutt-off position, using the small¬ er diameter valve. In these flow situations the secondary valve may be in an essentially more open position than the main vane in a corresponding situation.
The invention is described in more detail using the ap¬ pending drawings of which Figure 1 is a cross section of the equipment showing the conical outflow section situated at the base of the material silo and of the flow-promoting elements placed in it,
Figure 2 is an illustration of the corresponding equipment as seen from above, and
Figure 3 shows three operating positions of the in¬ ventive valve.
Figure 1 is an illustration of the conical outflow sec¬ tion, indicated throughout by the reference number 1, placed in the base section of a silo 17 containing powder material. The bottom section of the cone is provided with an outflow opening 3, the flow through the opening being controlled by means of a valve whose structure is de¬ scribed in more detail hereafter. Elements 4, via which compressed air, for example, can be led into the ma¬ terial to be evacuated, have been provided onto the in¬ ternal walls of the cone 1 in order to promote the flow of the powder material and to prevent the hangings of the material. Air is led in sufficiently to put the material to be evacuated into a readily flowing, fluidized state, but with the flow of air being controlled by means of appropriate flow-constricting devices 11 so that the flow of air is not allowed to discharge upwards through the material to be evacuated when the silo is only partially full, for instance.
The said elements 4 are formed of perforated metal plate, for instance, the plate being welded onto the internal wall of the cone l so that a suitable duct is formed be- tween them and the wall 2 of the cone for the compressed air to flow in. Air is led into these ducts via pipes 14, 15, 16 placed at suitable heights. As shown in Fig. 2, there may be four elements 4 evenly distributed around the cone or there may be less of them, for instance three of them. The number of elements may also exceed four.
The control valve placed in the flow opening 3 is shown in Fig. 3. The valve comprises a conventional butterfly valve with a rotary vane 5 for shutting off the flow opening. The said vane is placed at the cross section of the flow opening, rotatably around an axle 6 coincident with the diameter of the cross section. In accordance with the invention, the rotary vane 5 is made to house concentrically another rotary vane, the latter vane being smaller in diameter. The operating mechanism of this smaller valve has been executed coaxially with the oper- ating mechanism of the primary valve 5. The rotation shafts 6 and 8 can be rotated independently, which allows different operating positions for the vanes, as for in¬ stance depicted in Fig. 3.
The operating mechanisms of the vanes 5 and 7 can be placed differently to that shown in Fig. 3, i.e. on the opposite sides of the valve. Similarly, the position of the smaller vane in respect to the primary vane need not be concentric either.

Claims

Patent claim:
An equipment for metering a powder material, the said equipment consisting of a bottom section (1) having the shape of an inverted cone at the base of a silo (17) con¬ taining the material, the lower extremity of the said bottom section being provided with an out-flow opening (3) for evacuating the material, and the internal walls of the bottom section being provided with devices (4) for blowing air or some other gas medium into the material to be evacuated in order to promote its out-flow, and of a butterfly valve at the out-flow opening (3) , character¬ ized in that the vane (5) of the primary butterfly valve is provided with a butterfly valve (7) of a smaller diam- eter, the opening and closing of the latter valve being independent of the operation of the larger primary valve.
PCT/FI1994/000251 1993-06-24 1994-06-10 Equipment for metering a powder material from a silo WO1995000428A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU68477/94A AU6847794A (en) 1993-06-24 1994-06-10 Equipment for metering a powder material from a silo

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI932945A FI96297C (en) 1993-06-24 1993-06-24 Apparatus for dispensing a powdered substance from a tank
FI932945 1993-06-24

Publications (1)

Publication Number Publication Date
WO1995000428A1 true WO1995000428A1 (en) 1995-01-05

Family

ID=8538212

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1994/000251 WO1995000428A1 (en) 1993-06-24 1994-06-10 Equipment for metering a powder material from a silo

Country Status (4)

Country Link
AU (1) AU6847794A (en)
FI (1) FI96297C (en)
WO (1) WO1995000428A1 (en)
ZA (1) ZA944153B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19619036A1 (en) * 1996-04-30 1997-11-13 Schering Ag New vitamin D derivatives with carbo- or heterocyclic substituents at C-25, process for their preparation and their use in the manufacture of medicinal products
EP1072537A1 (en) 1999-07-26 2001-01-31 Neuhäuser GmbH, Umwelt-, Dosier- und Transporttechnologie Dosing device with high dosing precision
DE19934149A1 (en) * 1999-07-26 2001-02-01 Neuhaeuser Gmbh Umwelt Dosier Device for forming gas-tight seal between hopper and container which is being filled with liquid or bulk material comprises trough which surrounds hopper outlet and is filled with liquid and into which sealing lip fitted to hopper dips
DE202004002941U1 (en) * 2004-02-24 2005-06-16 KAM klüger automatisieren GmbH Filling device for dosed filling of bulk material comprises a tubular filler neck that can be closed by a plate-shaped closing device having a support plate and a brush arrangement fixed to the support plate
DE102004036273A1 (en) * 2004-07-27 2006-03-23 Kalnbach, Reinhard, Dipl.-Ing. Sealing and discharge device for silo or bulk material container has lock rotatable by 360 degrees and consisting of at least four semi-circular segments each of which by straight section is fastened and offset on driven shaft
CN108662159A (en) * 2018-07-03 2018-10-16 浙江融乐环境科技有限公司 A kind of butterfly valve with ventilation function

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE451708B (en) * 1985-09-27 1987-10-26 Per Ingemar Aulin Granular material metering throttle
FI80430B (en) * 1988-05-25 1990-02-28 Partek Ab UTMATNINGSANORDNING.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE451708B (en) * 1985-09-27 1987-10-26 Per Ingemar Aulin Granular material metering throttle
FI80430B (en) * 1988-05-25 1990-02-28 Partek Ab UTMATNINGSANORDNING.

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19619036A1 (en) * 1996-04-30 1997-11-13 Schering Ag New vitamin D derivatives with carbo- or heterocyclic substituents at C-25, process for their preparation and their use in the manufacture of medicinal products
EP1072537A1 (en) 1999-07-26 2001-01-31 Neuhäuser GmbH, Umwelt-, Dosier- und Transporttechnologie Dosing device with high dosing precision
DE19934149A1 (en) * 1999-07-26 2001-02-01 Neuhaeuser Gmbh Umwelt Dosier Device for forming gas-tight seal between hopper and container which is being filled with liquid or bulk material comprises trough which surrounds hopper outlet and is filled with liquid and into which sealing lip fitted to hopper dips
DE202004002941U1 (en) * 2004-02-24 2005-06-16 KAM klüger automatisieren GmbH Filling device for dosed filling of bulk material comprises a tubular filler neck that can be closed by a plate-shaped closing device having a support plate and a brush arrangement fixed to the support plate
DE102004036273A1 (en) * 2004-07-27 2006-03-23 Kalnbach, Reinhard, Dipl.-Ing. Sealing and discharge device for silo or bulk material container has lock rotatable by 360 degrees and consisting of at least four semi-circular segments each of which by straight section is fastened and offset on driven shaft
DE102004036273B4 (en) * 2004-07-27 2006-10-12 Kalnbach, Reinhard, Dipl.-Ing. Closing and removal device for a silo or bulk container
CN108662159A (en) * 2018-07-03 2018-10-16 浙江融乐环境科技有限公司 A kind of butterfly valve with ventilation function

Also Published As

Publication number Publication date
FI932945A (en) 1994-12-25
FI96297C (en) 1996-06-10
ZA944153B (en) 1995-02-07
FI932945A0 (en) 1993-06-24
FI96297B (en) 1996-02-29
AU6847794A (en) 1995-01-17

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