GB2496620A - Apparatus suitable for producing an air curtain - Google Patents

Apparatus suitable for producing an air curtain Download PDF

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Publication number
GB2496620A
GB2496620A GB1119753.0A GB201119753A GB2496620A GB 2496620 A GB2496620 A GB 2496620A GB 201119753 A GB201119753 A GB 201119753A GB 2496620 A GB2496620 A GB 2496620A
Authority
GB
United Kingdom
Prior art keywords
hopper
air
text
suction
chute
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.)
Withdrawn
Application number
GB1119753.0A
Other versions
GB201119753D0 (en
Inventor
Manuel Angel Silvaarias
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.)
Taller Mecanico Manuel Silva S A
Original Assignee
Taller Mecanico Manuel Silva S A
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 Taller Mecanico Manuel Silva S A filed Critical Taller Mecanico Manuel Silva S A
Priority to GB1119753.0A priority Critical patent/GB2496620A/en
Publication of GB201119753D0 publication Critical patent/GB201119753D0/en
Publication of GB2496620A publication Critical patent/GB2496620A/en
Withdrawn legal-status Critical Current

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
    • B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/02—Devices for feeding articles or materials to conveyors
    • B65G47/16—Devices for feeding articles or materials to conveyors for feeding materials in bulk
    • B65G47/18—Arrangements or applications of hoppers or chutes
    • 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
    • B65D88/00—Large containers
    • B65D88/26—Hoppers, i.e. containers having funnel-shaped discharge sections
    • 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
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
    • B65D88/70—Large containers characterised by means facilitating filling or emptying preventing bridge formation using fluid jets
    • B65D88/703—Air blowing devices, i.e. devices for the sudden introduction of compressed air into the container
    • 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
    • B65D88/00—Large containers
    • B65D88/74—Large containers having means for heating, cooling, aerating or other conditioning of contents
    • 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
    • B65G65/00—Loading or unloading
    • B65G65/30—Methods or devices for filling or emptying bunkers, hoppers, tanks, or like containers, of interest apart from their use in particular chemical or physical processes or their application in particular machines, e.g. not covered by a single other subclass
    • 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
    • B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
    • B65G69/18—Preventing escape of dust
    • B65G69/185—Preventing escape of dust by means of non-sealed systems
    • 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
    • B65G69/00—Auxiliary measures taken, or devices used, in connection with loading or unloading
    • B65G69/18—Preventing escape of dust
    • B65G69/185—Preventing escape of dust by means of non-sealed systems
    • B65G69/186—Preventing escape of dust by means of non-sealed systems with aspiration means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Auxiliary Methods And Devices For Loading And Unloading (AREA)

Abstract

An apparatus suitable for producing an air curtain comprises a first duct 2 (chute) having an air inlet 9 and an air outlet 10, a bypass duct 4 (passageway) in fluid communication with the first duct via an intermediate outlet 11 located between the air inlet and air outlet, an adjustable diverting means 3 (valve) being located in the first duct and arranged to control airflow to the air outlet or the bypass duct, and the bypass duct in fluid communication with a diffuser 5 to produce the air curtain. A plurality of the apparatus is used with a hopper for unloading bulk products to prevent dust produced in the hopper from flowing outside (fig 1). The hopper comprises a body (7), suction and filtration means (6) for sucking and filtering dust originated from the unloading. The air inlet receives air from the suction and filtration means. The diverting means may be flap valve or a plurality of valves.

Description

HOPPER AND EQUIPMENT FOR PRODUCING AIR CURTAIN FOR HOPPERS
Field of the Invention
The present invention is encompassed within the field of hoppers, and more specifically, in hoppers improved for unloading bulk products.
Background of the Invention
Hoppers known and already disclosed in patents such as ES200201 152 are hoppers for unloading dusty products comprising a movable structure and has at an upper position an area for unloading the product on the hopper itself, in the area of which there has been provided an upper protection cover, a modular protection grate of the closing system established at the loading mouth of the hopper, and central and side openings of that closing system for providing a continuous air current between the area located above the grate and the hopper itself, the latter being coupled at a lower position to a telescopic chute which finishes in a hood through which the product is unloaded on the container of the transport vehicle, the latter being located below the hopper structure. The assembly is provided for moving granular products from a storage site to a transport vehicle.
These hoppers mainly prevent the exit of the dust outwards by means of: -a flange-mediated closing system which prevented the exit of dust produced by the bulk fallen into the hopper, -an air suction system for sucking air from the inside of the hopper, which gathers the air volume displaced by the bulk when it falls into the hopper, redirecting it through a series of bag filters to the outside of the hopper, the air is now clean, and -some side wallfaces above the closing system between which the scoop is introduced for unloading the bulk, preventing the dust caused by opening the scoop and by the bulk falling on the grating and the upper closing system from coming out of the hopper The known systems having upper closing under the scoop and bag filter-mediated suction system installed in the hoppers prevent the spread of the dust of the order between 85 and 90% in a conventional hopper, nevertheless, the speed of cross-wind greatly influences the operation of the hopper, especially at ports, this means that the remaining 10-15% is greatly influenced by the height of the wallfaces and the speed and direction of the prevailing winds at the time of unloading.
These winds, in addition to a certain speed (the lower the speed the lower the side wallface), cause on the container formed by the side wallfaces, a vacuum "Venturi Effect" which absorbs the air (and therefore the dust contained therein) existing inside the waliface when the scoop is opened over the upper grating and closing system of the hopper.
This Venturi Effect' pulls the dust generated at the time of opening the scoop to the outside of the wallface, and the wind causing the "Venturi" spreads this dust all around the hopper itself, reducing the efficiency thereof.
In order to prevent the mentioned problem, modifications have been made in the hoppers by making holes in the upper closing system for increasing the suction from the upper part and compensating that "Venturi Effect", as well as increasing the height of the wallfaces, But both procedures are limited by the operation of the hopper itself: If the upper closing is opened too much, the suction capacity of the bag filters.
their number and positioning would have to be increased to a number which is impossible to place, and the walifaces cannot be raised so much that they complicate and/or prevent the entrance of the scoop in the hopper.
Description of the Invention
The invention relates to hoppers with an upper closing system comprising an air injection system along the perimeter of the upper mouth of the hopper which produces the horizontal air curtain" effect, preventing the dust particles produced at the time of unloading the scoop on the upper grating, which are not absorbed by the bag filter suction system from exiling to the outside.
The curtain is formed by constructing chutes with an intermediate valve (flap valve) at the upper mouth of the hopper which communicate the outlet of the fans of the bag filters sucking from inside the hopper and redirecting the now clean aspired air flow thereof through the bags, through a conduit system located along the upper perimeter of the mouth of the hopper, to the height of its closing wallfaces.
At the end of this air conduit circuit there is located a series of panoramic diffusers causing an airbiast surface, calculated by their number and position, so that the entire surface of the mouth of the hopper above the unloading point of the scoop is covered. Thus the possible dust particles not absorbed by the bag filter suction means meets said curtain and are again pushed into to the suction flow of the hopper.
In the tests performed, the direction and speed of the prevailing winds during the unloading operation with the ecological hopper significantly influence the behavior of the "air curtain", therefore the air coming out through the panoramic diffusers must maintain a constant flow rate between 4 and 6 m3/sec., with an exit speed between 5 and 6 m/sec. Due to that, and taking into account that the bag filters of one and the same hopper can be of different flow rates, as well as the efficiency loss thereof as the bags being filled up, diverting means which can be a flap valve or a plurality of valves regulating and directing the air flow coming out from each of the bag filters, either towards the diffuser forming the air curtain or to the outside of the hopper are S incorporated.
These diverting means can be manually, hydraulically or pneumatically controlled, and they regulate the part of air coming out from the bag filters, sending the air making up the air curtain which causes the closing of the upper part of the hopper towards the diffuser, adapting the air curtain exit speed and the flow rate to the speed and direction of the prevailing winds around the hopper being achieved.
Through the mathematical models studied, the layers of the lower part of the curtain air flow are downwardly curved (towards the inside of the hopper), due to the absorbing force caused by the fans of the bag filters of the inside of the hopper, pushing the provoked dust particles towards the inside of the hopper at the time of opening the scoop. Therefore the Venturi Effect" causing the prevailing winds on the wallface absorbs the upper layers of the air curtain itself, which do not contain dust.
Completing therefore the operation efficiency of the hopper up to 100%.
The hopper described does not introduce new fans to the known hopper, but the fans of the bag filters themselves which extract the air with dust from the inside of the hopper, for redirecting it towards the upper diffusers forming the air curtain are used.
Brief Description of the Drawings
A series of drawings which aid to better understand the invention and which are expressly related to an embodiment of said invention presented as a non-limiting example of the latter are very briefly described below.
Figure 1 shows a section of the hopper with the plurality of equipment for producing air curtain.
Figure 2A shows an elevational view of equipment for producing air curtain with the flap valve in the position not diverted to the passageway.
Figure 2B shows a perspective view of Figure 2A.
Figure 2C shows a perspective view of Figure 2A without diffuser.
Figure 3A shows an elevational view of equipment for producing air curtain with the flap valve in the position diverted to the passageway.
Figure 3B shows a perspective view of Figure 3A.
Figure 3C shows a perspective view of Figure 3A without diffuser.
A series of references corresponding to the elements indicated below without involving any limiting character is identified in the aforementioned drawings: 1.-Equipment for producing air curtain 2.-Chute 3.-Flap valve 4.-Passageway 5.-Diffuser 6.-Suction and filtration means 7.-Body of the hopper 8.-Mouth of the hopper 9.-Air inlet of the chute 10.-Air outlet of the chute 11.-Intermediate outlet of the chute
Detailed Description of an Embodiment
Figure 1 shows a hopper for unloading bulk products comprising a body (7) and suction and filtration means (6) for sucking and filtering dust originated from the unloading, and a plurality of equipment for producing air curtain (1) arranged along the upper perimeter of the mouth (8) of the hopper, each comprising: -a chute (2) comprising an air inlet (9) for air coming from the suction and filtration means (6), an exiting outlet (10) and an intermediate outlet (11), -an adjustable diverting means (3), selected between a flap valve or a plurality of valves, arranged at the intermediate outlet (11) of the inside of the chute (2), -a passageway (4) connected to the chute (2) by the intermediate outlet (11), and -a diffuser (5) connected to the passageway (4), The diverting means (3) is configured for redirecting the air coming from the suction and filtration means (6) of the chute (2) outwards, as shown in Figures 2A, 23, 2C, or towards the passageway (4), as shown in Figures 3A, 3B, 3C, such that when the air is diverted to the passageway (4) an air curtain is formed at the mouth (8) of the hopper that again pushes the possible dust particles not absorbed by the suction and filtration means (6) into the suction flow of the hopper.

Claims (1)

  1. <claim-text>CLAIMS1.-Equipment for producing air curtain (1) characterized in that it comprises: -a chute (2) comprising an air inlet (9), an exiting outlet (10) and an intermediate outlet (11), -an adjustable diverting means (3) arranged at the intermediate outlet (11) of the inside of the chute (2), -a passageway (4) connected to the chute (2) by the intermediate outlet (11), and -a diffuser (5) connected to the passageway (4).</claim-text> <claim-text>2.-The equipment for producing air curtain (1) according to claim 1, characterized in that the diverting means (3) is a flap valve.</claim-text> <claim-text>3.-The equipment for producing air curtain (1) according to claim 1, characterized in that the diverting means (3) is a plurality of valves.</claim-text> <claim-text>4.-A hopper for unloading bulk products comprising a body (7) and suction and filtration means (6) for sucking and filtering dust originated from the unloading, characterized by comprising a plurality of equipment for producing air curtain (1) arranged along the upper perimeter of the mouth (8) of the hopper, each comprising -a chute (2) comprising an air inlet (9) for air coming from the suction and filtration means (6), an exiting outlet (1 0) and an intermediate outlet (11), -an adjustable diverting means (3) arranged at the intermediate outlet (11) of the inside of the chute (2), -a passageway (4) connected to the chute (2) by the intermediate outlet (11), and -a diffuser (5) connected to the passageway (4), the diverting means (3) configured for redirecting the air coming from the suction and filtration means (6) outwards or towards the passageway (4) such that when the air is diverted to the passageway (4) an air curtain is produced at the mouth (8) of the hopper that again pushes the possible dust particles not absorbed by the suction and filtration means (6) into the suction flow of the hopper.</claim-text> <claim-text>5.-The hopper according to claim 4, characterized in that the diverting means (3) is a flap valve.</claim-text> <claim-text>6.-The hopper according to claim 4, characterized in that the diverting means (3) is a plurality of valves.</claim-text>
GB1119753.0A 2011-11-16 2011-11-16 Apparatus suitable for producing an air curtain Withdrawn GB2496620A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1119753.0A GB2496620A (en) 2011-11-16 2011-11-16 Apparatus suitable for producing an air curtain

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1119753.0A GB2496620A (en) 2011-11-16 2011-11-16 Apparatus suitable for producing an air curtain

Publications (2)

Publication Number Publication Date
GB201119753D0 GB201119753D0 (en) 2011-12-28
GB2496620A true GB2496620A (en) 2013-05-22

Family

ID=45444202

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1119753.0A Withdrawn GB2496620A (en) 2011-11-16 2011-11-16 Apparatus suitable for producing an air curtain

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104029945A (en) * 2014-06-04 2014-09-10 马鞍山市天工科技有限公司 Unblocking device for cylindrical flat-bottom-shaped reinforced concretebunker

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394755A (en) * 1967-02-06 1968-07-30 Conditionaire Australia Pty Lt Air screen creating-air conditioning apparatus
GB1125673A (en) * 1967-01-27 1968-08-28 Conditionaire Australia Pty Lt Improvements in air screen creating, air conditioning apparatus
JPS5257667A (en) * 1975-11-04 1977-05-12 Hitachi Ltd Dust proof hopper
WO1996026395A1 (en) * 1995-02-24 1996-08-29 Christiansen, John Localized, economical and healthy air conditioner

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1125673A (en) * 1967-01-27 1968-08-28 Conditionaire Australia Pty Lt Improvements in air screen creating, air conditioning apparatus
US3394755A (en) * 1967-02-06 1968-07-30 Conditionaire Australia Pty Lt Air screen creating-air conditioning apparatus
JPS5257667A (en) * 1975-11-04 1977-05-12 Hitachi Ltd Dust proof hopper
WO1996026395A1 (en) * 1995-02-24 1996-08-29 Christiansen, John Localized, economical and healthy air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104029945A (en) * 2014-06-04 2014-09-10 马鞍山市天工科技有限公司 Unblocking device for cylindrical flat-bottom-shaped reinforced concretebunker

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Publication number Publication date
GB201119753D0 (en) 2011-12-28

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)