WO2005018302A1 - A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines - Google Patents

A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines Download PDF

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Publication number
WO2005018302A1
WO2005018302A1 PCT/IT2003/000518 IT0300518W WO2005018302A1 WO 2005018302 A1 WO2005018302 A1 WO 2005018302A1 IT 0300518 W IT0300518 W IT 0300518W WO 2005018302 A1 WO2005018302 A1 WO 2005018302A1
Authority
WO
WIPO (PCT)
Prior art keywords
duct
venturi
flow
main
air
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.)
Ceased
Application number
PCT/IT2003/000518
Other languages
French (fr)
Inventor
Peter Pleyer
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.)
Gaspardo Seminatrici SpA
Original Assignee
Gaspardo Seminatrici SpA
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 Gaspardo Seminatrici SpA filed Critical Gaspardo Seminatrici SpA
Priority to PCT/IT2003/000518 priority Critical patent/WO2005018302A1/en
Priority to AU2003265144A priority patent/AU2003265144A1/en
Priority to ES03818280T priority patent/ES2302983T3/en
Priority to CA002535027A priority patent/CA2535027A1/en
Priority to EP03818280A priority patent/EP1657974B1/en
Priority to DE60319748T priority patent/DE60319748T2/en
Priority to CNB038269767A priority patent/CN100415071C/en
Priority to US10/569,189 priority patent/US7413387B2/en
Priority to AT03818280T priority patent/ATE388619T1/en
Publication of WO2005018302A1 publication Critical patent/WO2005018302A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • A01C7/08—Broadcast seeders; Seeders depositing seeds in rows
    • A01C7/081—Seeders depositing seeds in rows using pneumatic means
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C7/00—Sowing
    • A01C7/08—Broadcast seeders; Seeders depositing seeds in rows
    • A01C7/081—Seeders depositing seeds in rows using pneumatic means
    • A01C7/082—Ducts, distribution pipes or details thereof for pneumatic seeders
    • 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 present invention relates to a pneumatic distributor of granular and/or powdery materials according to the characteristics set out in the preamble to main Claim 1.
  • Distributors of the type indicated are used particularly but not exclusively in the technical field of sowing machines with pneumatic seed transportation.
  • a dosing device for example, of the volumetric type
  • the dosing device supplies metered quantities of seed into a Venturi duct (in short a "Venturi") by means of which the seed is introduced into an air-flow in a main duct of the distributor.
  • the air-flow is generated by forced ventilation, for example, by means of a blower or similar air-pressurization means so as to convey the air and seed mixture towards the sowing regions in a jet.
  • the main object of the invention is to provide a distributor which is designed structurally and functionally to overcome the limitations discussed with reference to the prior art mentioned. This object is achieved by the invention by means of a distributor formed in accordance with the appended claims.
  • Figure 1 is a schematic view of a distributor formed in accordance with the present invention.
  • Figure 2 is a view corresponding to that of Figure 1, and showing a variant of the invention.
  • a pneumatic distributor of granular and/or powdery materials designed particularly for the distribution of cereal seeds and the like and formed in accordance with the invention, is shown schematically and generally indicated 1.
  • the distributor may advantageously be arranged for mounting on a sowing machine of the known type produced by the Applicant.
  • the distributor 1 comprises a seed-loading hopper 2 on the base of which is fitted a volumetric dosing device 3 which has a roller 4 with blades 5 and which can deliver metered quantities of seeds in a continuous and calibrated flow of material.
  • the flow is conveyed, by means of a chute 6 arranged beneath the dosing roller, into the vicinity of an opening 7 of a main duct 8 of the distributor for the pneumatic transportation of the seeds to the sowing regions, as will be explained in detail below.
  • the main duct 8 has a first end 8a in the region of which it is connected to the output opening of a fan 9 or other similar blowing means suitable for producing a flow of air under pressure in the duct and a second, opposite end 8b from which suitable branches, all indicted 10, extend for the distribution of the material at a plurality of points.
  • a Venturi duct 11 is also defined in the main duct 8 and comprises a portion 11a which converges, with reference to the direction of the air-flow (from the end 8a towards the end 8b), an intermediate portion lib with a narrow cross- section, and a diverging, output portion lie of the Venturi.
  • the opening 7 is formed in the main duct 8 in the region of the narrow cross-sectioned portion lib, straddling the converging and diverging portions of the Venturi.
  • this intermediate, narrow cross-sectioned portion is the portion in which the air-flow passing through the Venturi has the greatest speed and the lowest pressure.
  • the opening 7 for the introduction of the material is advantageously formed by a circumferential interruption in the main duct 8, surrounded by a cup-shaped element 12 which is connected axially to the converging portion of the Venturi and can direct the dosed material into the narrow cross-sectioned portion of the Venturi.
  • the distributor 1 also comprises an auxiliary duct 13 extending to connect a section 14 of the main duct 8 that is upstream of the Venturi, to a section 15 thereof that is downstream of the Venturi, thus constituting a duct which bypasses the Venturi duct.
  • a portion of the air-flow generated by the fan 9 is thus tapped off by this duct 3 in the region of the section 14 and is introduced, downstream of the Venturi (section 15), into the air and seed mixture produced in the main duct.
  • the bypass duct 13, which is advantageously selected with a diameter such that the flow of air and the pressure in the main duct are not reduced, is preferably introduced into the main duct 8 directly at the output of the diverging portion lie of the Venturi.
  • the kinetic component of the air-seed mixture is thus suitably increased so as advantageously to increase the flow- rate of the material conveyed through the main duct.
  • the dosed seed is drawn into the main duct 8, thus promoting mixing with the air-flow which is generated by the fan 9 and passes through the Venturi 11, and also promoting the dispersal of the seeds in the air-flow, so that it is possible to economize on the "mixing" portion which is normally made of corrugated pipe.
  • both of the auxiliary ducts 13 are connected to the main duct 8 in the same sections of the main duct 8, upstream and downstream of the Venturi 11, respectively.
  • the flow-rate of material distributed can be increased by virtue of the provision of one or more bypass ducts according to the invention, which can recover some of the fan power that is blocked and not utilized because of the choking brought about by the Venturi.
  • Tests carried out by the Applicant have shown, by virtue of the structure of the distributor according to the invention, an increase in flow-rate of from a minimum of 25% up to more than 100% relative to the value obtained in known applications, for given values of all of the other operating parameters, including the dimensions of the Venturi and the nominal power of the fan.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Sowing (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

A pneumatic distributor of granular and/or powdery materials comprises a main distribution duct (8) having a first end (8a) in the region of which an air-flow is injected into the duct under pressure, and a second end (8b), the main duct (8) comprising respective adjacent converging-diverging portions (11a, 11b, 11c), with reference to the direction of the air-flow, defining a Venture duct (11). Dosing means (3) are provided for delivering a metered quantity of material into the main duct (8) in the region of the narrow cross-section (11b) of the Venturi duct, for the mixing of the material into the air-flow and the entertainment of the mixture obtained towards the second end (8b). The distributor comprises at least one auxiliary (13) duct, bypassing the Venturi duct (11), in order to connect a section (14) of the main duct (8) disposed upstream of the Venture duct to a section (15) of the main duct (8) disposed downstream of the Venturi duct.

Description

A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines Technical field
The present invention relates to a pneumatic distributor of granular and/or powdery materials according to the characteristics set out in the preamble to main Claim 1. Background art
Distributors of the type indicated are used particularly but not exclusively in the technical field of sowing machines with pneumatic seed transportation. In these applications, it is known to provide a seed-loading hopper to which a dosing device, for example, of the volumetric type, is fitted; the dosing device supplies metered quantities of seed into a Venturi duct (in short a "Venturi") by means of which the seed is introduced into an air-flow in a main duct of the distributor. The air-flow is generated by forced ventilation, for example, by means of a blower or similar air-pressurization means so as to convey the air and seed mixture towards the sowing regions in a jet.
The limitations imposed by the overall size of the distributor, which is dictated partly by the size of the components used as well as by the space offered by the machine equipped with the distributor, generally suggest the use of a Venturi having a narrow cross-section with a diameter no greater than preset values. However, these dimensional limitations of the Venturi duct penalize the utilization of the power deliverable by the blower that is used to produce the forced ventilation in the air flow; this power is thus only partially transferred to the air and seed mixture in the respective static and kinetic energy components, resulting in low efficiency and low flow-rates of material delivered in comparison with those that could theoretically be achieved with the power used. Description of the invention
The main object of the invention is to provide a distributor which is designed structurally and functionally to overcome the limitations discussed with reference to the prior art mentioned. This object is achieved by the invention by means of a distributor formed in accordance with the appended claims.
Brief description of the drawings
Further characteristics and advantages of the invention will become clear from the following detailed description of a preferred embodiment thereof which is described by way of non-limiting example with reference to the appended drawings, in which:
Figure 1 is a schematic view of a distributor formed in accordance with the present invention, and
Figure 2 is a view corresponding to that of Figure 1, and showing a variant of the invention.
Preferred embodiment of the invention
With initial reference to Figure 1, a pneumatic distributor of granular and/or powdery materials, designed particularly for the distribution of cereal seeds and the like and formed in accordance with the invention, is shown schematically and generally indicated 1. The distributor may advantageously be arranged for mounting on a sowing machine of the known type produced by the Applicant.
The distributor 1 comprises a seed-loading hopper 2 on the base of which is fitted a volumetric dosing device 3 which has a roller 4 with blades 5 and which can deliver metered quantities of seeds in a continuous and calibrated flow of material. The flow is conveyed, by means of a chute 6 arranged beneath the dosing roller, into the vicinity of an opening 7 of a main duct 8 of the distributor for the pneumatic transportation of the seeds to the sowing regions, as will be explained in detail below.
The main duct 8 has a first end 8a in the region of which it is connected to the output opening of a fan 9 or other similar blowing means suitable for producing a flow of air under pressure in the duct and a second, opposite end 8b from which suitable branches, all indicted 10, extend for the distribution of the material at a plurality of points.
A Venturi duct 11 is also defined in the main duct 8 and comprises a portion 11a which converges, with reference to the direction of the air-flow (from the end 8a towards the end 8b), an intermediate portion lib with a narrow cross- section, and a diverging, output portion lie of the Venturi. The opening 7 is formed in the main duct 8 in the region of the narrow cross-sectioned portion lib, straddling the converging and diverging portions of the Venturi. As is well known, this intermediate, narrow cross-sectioned portion is the portion in which the air-flow passing through the Venturi has the greatest speed and the lowest pressure. It should be noted that the opening 7 for the introduction of the material is advantageously formed by a circumferential interruption in the main duct 8, surrounded by a cup-shaped element 12 which is connected axially to the converging portion of the Venturi and can direct the dosed material into the narrow cross-sectioned portion of the Venturi.
The distributor 1 according to the invention also comprises an auxiliary duct 13 extending to connect a section 14 of the main duct 8 that is upstream of the Venturi, to a section 15 thereof that is downstream of the Venturi, thus constituting a duct which bypasses the Venturi duct. A portion of the air-flow generated by the fan 9 is thus tapped off by this duct 3 in the region of the section 14 and is introduced, downstream of the Venturi (section 15), into the air and seed mixture produced in the main duct. The bypass duct 13, which is advantageously selected with a diameter such that the flow of air and the pressure in the main duct are not reduced, is preferably introduced into the main duct 8 directly at the output of the diverging portion lie of the Venturi. The kinetic component of the air-seed mixture is thus suitably increased so as advantageously to increase the flow- rate of the material conveyed through the main duct.
In operation, by virtue of the reduction in pressure in the narrow cross-section of the Venturi duct, the dosed seed is drawn into the main duct 8, thus promoting mixing with the air-flow which is generated by the fan 9 and passes through the Venturi 11, and also promoting the dispersal of the seeds in the air-flow, so that it is possible to economize on the "mixing" portion which is normally made of corrugated pipe. Owing to the choking brought about in the main duct 8 by the Venturi, without a bypass duct the power deliverable by the fan would not be fully utilized but, by virtue of the provision of the bypass duct, some of the power of the fan is transferred to the auxiliary bypass airflow which thus increases the kinetic component of the air-flow downstream of the Venturi, resulting in an increase in the hourly flow-rate of the air-seed mixture. With the distributor according to the invention, it is thus possible to increase the flow-rate of material for a given Venturi duct and fan, utilizing the power of the fan fully, by virtue of the provision of one or more bypass ducts of the type described above.
In a variant of the invention, shown in Figure 2, two bypass ducts 13 are provided, each duct having the characteristics described in the previous embodiment, to which reference should be made for all of the relative details. In a preferred embodiment of this variant of the invention, both of the auxiliary ducts 13 are connected to the main duct 8 in the same sections of the main duct 8, upstream and downstream of the Venturi 11, respectively. The invention thus solves the problem posed, affording the advantages indicated over known solutions. It should be noted in particular that, in known distributors having Venturi ducts of predetermined dimensions and size as well as fans with preselected characteristics, the flow-rate of material distributed can be increased by virtue of the provision of one or more bypass ducts according to the invention, which can recover some of the fan power that is blocked and not utilized because of the choking brought about by the Venturi. Tests carried out by the Applicant have shown, by virtue of the structure of the distributor according to the invention, an increase in flow-rate of from a minimum of 25% up to more than 100% relative to the value obtained in known applications, for given values of all of the other operating parameters, including the dimensions of the Venturi and the nominal power of the fan.

Claims

1. A pneumatic distributor of granular and/or powdery materials, comprising: a main distribution duct (8) having a first end (8a) in the region of which an air-flow is injected into the duct under pressure, and a second end
(8b), the main duct (8) comprising respective adjacent converging-diverging portions (11a, lib, lie), with reference to the direction of the air-flow, defining a Venturi duct (11), and dosing means (3) for delivering a metered quantity of material into the main duct (8) in the region of the narrow cross-section (lib) of the Venturi duct, for the mixing of the material into the air-flow and the entrainment of the mixture obtained towards the second end (8b), characterized in that it comprises at least one auxiliary (13) duct, bypassing the Venturi duct (11), in order to connect a section (14) of the main duct (8) disposed upstream of the Venturi duct to a section (15) of the main duct (8) disposed downstream of the Venturi duct.
2. A distributor according to Claim 1 in which the auxiliary bypass duct (13) is in flow communication with the main duct (8) downstream of the Venturi duct (11) in the region of an output portion positioned as close as possible to the diverging portion (lie) of the Venturi duct, with reference to the direction of the air-flow.
3. A distributor according to Claim 1 or Claim 2, comprising at least two auxiliary ducts (13) bypassing the Venturi duct (11).
4. A distributor according to Claim 3 in which both of the auxiliary ducts (13) are connected to the main duct (8) in the same sections of the main duct
(8), upstream and downstream of the Venturi (11), respectively.
PCT/IT2003/000518 2003-08-26 2003-08-26 A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines Ceased WO2005018302A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
PCT/IT2003/000518 WO2005018302A1 (en) 2003-08-26 2003-08-26 A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines
AU2003265144A AU2003265144A1 (en) 2003-08-26 2003-08-26 A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines
ES03818280T ES2302983T3 (en) 2003-08-26 2003-08-26 A PNEUMATIC DISTRIBUTOR FOR GRANULATED AND / OR POWDERED MATERIALS, IN PARTICULAR FOR SEEDING MACHINES.
CA002535027A CA2535027A1 (en) 2003-08-26 2003-08-26 A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines
EP03818280A EP1657974B1 (en) 2003-08-26 2003-08-26 A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines
DE60319748T DE60319748T2 (en) 2003-08-26 2003-08-26 AIR DISTRIBUTORS OF GRAIN AND / OR POWDER MATERIAL, IN PARTICULAR FOR SEWING MACHINES
CNB038269767A CN100415071C (en) 2003-08-26 2003-08-26 Pneumatic distributor for cereal seeds
US10/569,189 US7413387B2 (en) 2003-08-26 2003-08-26 Pneumatic distributor of granular and/or powdery materials, in particular for sowing machines
AT03818280T ATE388619T1 (en) 2003-08-26 2003-08-26 COMPRESSED AIR DISTRIBUTOR OF GRANULAR AND/OR POWDERY MATERIALS, ESPECIALLY FOR SEED MACHINES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2003/000518 WO2005018302A1 (en) 2003-08-26 2003-08-26 A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines

Publications (1)

Publication Number Publication Date
WO2005018302A1 true WO2005018302A1 (en) 2005-03-03

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PCT/IT2003/000518 Ceased WO2005018302A1 (en) 2003-08-26 2003-08-26 A pneumatic distributor of granular and/or powdery materials, in particular for sowing machines

Country Status (9)

Country Link
US (1) US7413387B2 (en)
EP (1) EP1657974B1 (en)
CN (1) CN100415071C (en)
AT (1) ATE388619T1 (en)
AU (1) AU2003265144A1 (en)
CA (1) CA2535027A1 (en)
DE (1) DE60319748T2 (en)
ES (1) ES2302983T3 (en)
WO (1) WO2005018302A1 (en)

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WO2013130003A1 (en) * 2012-03-01 2013-09-06 Väderstad-Verken Ab Method for calibrating a device for feeding a granular or powder material and such device
EP2448392A4 (en) * 2009-07-02 2013-10-30 Kinze Mfg Inc AIR DRIVING DEVICE FOR SEED DISTRIBUTION
EP2808606A1 (en) 2013-05-27 2014-12-03 Eurl Dominique Hanne Device and method for transporting and dispensing solid fuel
EP3620041A1 (en) * 2018-09-05 2020-03-11 Deere & Company A work vehicle and method of operating such
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EP2448392A4 (en) * 2009-07-02 2013-10-30 Kinze Mfg Inc AIR DRIVING DEVICE FOR SEED DISTRIBUTION
EP2724600A1 (en) * 2009-07-02 2014-04-30 Kinze Manufacturing, Inc. Air entrainment device for seed delivery
CZ303878B6 (en) * 2011-12-20 2013-06-05 Farmet A.S. Device for feeding grains
WO2013130003A1 (en) * 2012-03-01 2013-09-06 Väderstad-Verken Ab Method for calibrating a device for feeding a granular or powder material and such device
EP2808606A1 (en) 2013-05-27 2014-12-03 Eurl Dominique Hanne Device and method for transporting and dispensing solid fuel
EP3620041A1 (en) * 2018-09-05 2020-03-11 Deere & Company A work vehicle and method of operating such
US10993367B2 (en) 2018-09-05 2021-05-04 Deere & Company Commodity delivery system for work vehicle with venturi suction generator
AU2019213300B2 (en) * 2018-09-05 2025-04-24 Deere & Company Commodity delivery system for work vehicle with venturi suction generator
FR3158714A1 (en) 2024-01-31 2025-08-01 E.R.P.I Solid fuel transport and distribution device

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DE60319748D1 (en) 2008-04-24
CN100415071C (en) 2008-09-03
DE60319748T2 (en) 2009-04-02
CN1819762A (en) 2006-08-16
EP1657974A1 (en) 2006-05-24
EP1657974B1 (en) 2008-03-12
US20070181048A1 (en) 2007-08-09
AU2003265144A1 (en) 2005-03-10
CA2535027A1 (en) 2005-03-03
ATE388619T1 (en) 2008-03-15
ES2302983T3 (en) 2008-08-01
US7413387B2 (en) 2008-08-19

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