WO2003087580A1 - Bulk material pump feeder - Google Patents

Bulk material pump feeder

Info

Publication number
WO2003087580A1
WO2003087580A1 PCT/US2003/007869 US0307869W WO03087580A1 WO 2003087580 A1 WO2003087580 A1 WO 2003087580A1 US 0307869 W US0307869 W US 0307869W WO 03087580 A1 WO03087580 A1 WO 03087580A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
drive
wall
drive discs
outlet
Prior art date
Application number
PCT/US2003/007869
Other languages
French (fr)
Inventor
Timothy R. Baer
James T. Foley
Original Assignee
K-Tron Technologies, Inc.
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 K-Tron Technologies, Inc. filed Critical K-Tron Technologies, Inc.
Priority to KR1020047016086A priority Critical patent/KR100953893B1/en
Priority to AU2003220273A priority patent/AU2003220273A1/en
Priority to BRPI0309141-4A priority patent/BR0309141B1/en
Priority to EP03716571A priority patent/EP1495230B1/en
Priority to DE60332447T priority patent/DE60332447D1/en
Priority to JP2003584500A priority patent/JP4649110B2/en
Publication of WO2003087580A1 publication Critical patent/WO2003087580A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D23/00—Other rotary non-positive-displacement pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/46—Gates or sluices, e.g. rotary wheels
    • 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
    • B65G31/00—Mechanical throwing machines for articles or solid materials
    • B65G31/04—Mechanical throwing machines for articles or solid materials comprising discs, drums, or like rotary impellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/40—Feeding or discharging devices
    • B65G53/42—Nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2261—Rotors specially for centrifugal pumps with special measures
    • F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating

Definitions

  • the present invention relates, in general, to materials handling equipment and, in particular, to a pump feeder of materials handling equipment that feeds bulk materials.
  • a pump feeder moves bulk material through a housing from an inlet to an outlet by a rotating drive rotor having two or more drive discs mounted to or integral with a rotating hub.
  • this type of equipment has been used for feeding coal and other breakable material having uniform and non-uniform gradation.
  • the drive systems for this equipment have delivered large torque at slow speed.
  • a bulk materials pump feeder constructed in accordance with the present invention, includes a housing having an inlet, an outlet, and an inner wall extending from the inlet of the housing to the outlet of the housing.
  • This bulk materials pump feeder also includes a drive rotor having a hub rotatable about a rotation axis and a plurality of drive discs extending away from the hub toward the inner wall of the housing. The distance between the circumferential edges of the drive discs and the inner wall of the housing increases from the inlet of the housing to the outlet of the housing in the direction of rotation of the drive rotor.
  • the inner wall of the housing, the drive discs, and the hub define a materials transfer duct through which material is transferred from the inlet of the housing to the outlet of the housing.
  • Figure 1 is an exploded, perspective view of a bulk materials pump feeder constructed in accordance with the present invention.
  • Figure 2 is a side view of a bulk materials pump feeder constructed in accordance with the present invention.
  • Figure 3 is a schematic drawing of the relationship between the drive discs and the inner wall of the housing of a bulk materials pump feeder constructed in accordance with the present invention.
  • Figure 4 is a side view showing the relationship of the Figure 1 drive rotor hub and the Figure 1 materials scraper.
  • Figure 5 is a side view showing the relationship of the Figure 1 drive rotor hub and a second materials scraper.
  • a bulk materials pump feeder constructed in accordance with the present invention, includes an housing 10 having an inlet 12, an outlet 14, and an inner wall 16 extending from inlet 12 to outlet 14.
  • a bulk materials pump feeder, constructed in accordance with the present invention is generally similar in construction and operation to the units described and illustrated in U.S. Patent 5,051,041 and U.S. Patent 5,355,993, the contents of which are incorporated herein by reference.
  • the bulk materials pump feeder of Figures 1 and 2 also has a drive rotor 18 having a hub 20 that is rotatable about a rotation axis 22 and a pair of drive discs 24 which extend away from the hub toward inner wall 16 of housing 10.
  • hub 20 and drive discs 24 are formed as a single unit.
  • Drive discs 24 can be formed with radially extending discontinuities on the interior faces as described and illustrated in U.S. Patent 5,355,993 to facilitate transfer of material from inlet 12 of housing 10 to outlet 14 of the housing.
  • the outside surfaces of drive discs 24 each have a bevel 24a at the circumferential edge of the drive disc for a reason to be explained below.
  • Drive rotor 18 is mounted in housing 10 for rotation about rotation axis 22 and is held in place by, for example, a screw 25.
  • drive rotor 18 has two drive discs 24.
  • Drive rotor 18 can be arranged to have more than two drive discs. The number of drive discs to be included in the drive rotor is dependent on the particular application of bulk materials pump feeder (i.e. , materials being transferred, performance specifications, etc.).
  • FIG. 3 is a schematic drawing of the relationship between drive discs 24 and inner wall 16 of housmg 10
  • the distance between the circumferential edges of the drive discs and the inner wall of the housing increases from the INLET of the housing to the OUTLET of the housing in the direction of rotation of the drive rotor, which is clockwise as indicated by the arrow for the embodiment of the invention illustrated in the drawings and being described.
  • the drive discs and the inner wall of the housing can be shaped in different ways to provide the desired spacing between the two.
  • drive discs 24 are circular and extend away from hub 20 perpendicular to rotation axis 22 of the hub and inner wall 16 of housing 10 is spiral shaped.
  • the spiral shaped inner wall 16 of housing 10 can be defined by the Archimedes spiral equation:
  • ⁇ is the polar angle "a” is the rate of radial increase given in some unit of measure per angular unit, such as mm/degree
  • a is the rate of radial increase given in some unit of measure per angular unit, such as mm/degree
  • the desired increasing distance between the circumferential edges of the drive discs and the inner wall of the housing is effected by the spiral shape of the inner wall of the housing.
  • This desired increasing distance between the circumferential edges of the drive discs and the inner wall of the housing also can be effected by the design of the drive discs or by a combination of the design of the drive discs and the design of the inner wall of the housing.
  • Inner wall 16 of housing 10, the inside surfaces of drive discs 24, and hub 20 define a materials transfer duct through which material is transferred from inlet 12 of the housing to outlet 14 of the housing.
  • drive rotor 18 is rotated by a motor (not shown) coupled to the drive rotor by suitable means, drive discs 24 cause material, introduced into the bulk materials pump feeder through inlet 12 of housing 10, to be transferred to outlet 14 of the housing where the material is discharged from the bulk materials pump feeder.
  • a bulk materials pump feeder constructed in accordance with the present invention, preferably includes a materials scraper 26 that is mounted in a recess 28 in inner wall 16 of housing 10 downstream from outlet 14 and upstream from inlet 12. Materials scraper 26 extends into drive rotor 18 in the space between the interior faces of drive discs 24 almost touching hub 20.
  • Materials scraper 28 has two surfaces 30 (only one is illustrated in Figure 1) that face the circumferential edges of drive discs 24.
  • the distance between surfaces 30 of the materials scraper and the circumferential edges of the drive discs increases in the direction of rotation of drive rotor 18 from the distance between inner wall 16 of housing 10 and the circumferential edges of drive discs at outlet 14 of the housing to the distance between the inner wall of the housing and the circumferential edges of the drive discs at inlet 12 of the housing.
  • surfaces 30 of materials scraper 26 are, in effect, continuations of inner wall 16 of the housing, so that material that is not discharged at outlet 14 that tends to wedge between the materials scraper and the circumferential edges of drive discs 24 moves in the direction of rotation of the drive rotor to a larger spacing between the drive discs and the materials scraper and either falls back and is discharged through the outlet or falls in with material that is introduced at the inlet 12.
  • the increasing space between surfaces 30 of materials scraper 26 and the circumferential edges of drive discs 24, from the OUTLET to the INLET, is illustrated in Figure 3.
  • Materials scraper 28 that is illustrated in Figures 1 and 4 has a plurality of scraping tips 26a, 26b, and 26c that scrape material that is not discharged at outlet 14.
  • the spacing between materials scraper 26 and hub 20, specifically the spacing between scraping tips 26a, 26b, and 26c and the hub increases in the direction of rotation of drive rotor 18 from outlet 14 to inlet 12 to reduce, or even eliminate, the tendency of material to wedge between the scraper and the hub.
  • Scraping tips 26a, 26b, and 26c can be points on a spiral or simply points that are spaced from hub 20 the desired distances.
  • Scraper 26' of Figure 5 has a continuous scraping surface, rather than a plurality of scraping tips as in materials scraper 26 shown in Figure 4.
  • the spacing between the scraping surface of materials scraper 26' and hub 20 increases in the direction of rotation of the from outlet 14 to inlet 12 to reduce, or even eliminate, the tendency of material to wedge between the scraper and the hub.
  • the scraping surface of materials scraper 26' can be spiral shaped.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Rotary Pumps (AREA)

Abstract

A bulk materials pump feeder having a housing and a rotatable drive rotor mounted in the housing for transferring material introduced into the housing through an inlet to an outlet for discharge of the material from the housing. The drive rotor has a hub and a plurality of drive discs extending away from the hub toward an inner wall of the housing. To reduce the tendency of material passing through the housing to wedge between the inner wall of the housing and the circumferential edges of the drive discs, the distance between the circumferential edges of the drive discs and the inner wall of the housing increases from the inlet of the housing to the outlet of the housing in the direction of rotation of the drive rotor.

Description

BULK MATERIAL PUMP FEEDER
TECHNICAL FIELD
The present invention relates, in general, to materials handling equipment and, in particular, to a pump feeder of materials handling equipment that feeds bulk materials.
BACKGROUND OF THE INVENTION
In certain bulk materials handling equipment, such as the equipment described and illustrated in U.S. Patent 5,051,041 and U.S. Patent 5,355,993, a pump feeder moves bulk material through a housing from an inlet to an outlet by a rotating drive rotor having two or more drive discs mounted to or integral with a rotating hub. In the past, this type of equipment has been used for feeding coal and other breakable material having uniform and non-uniform gradation. Typically, the drive systems for this equipment have delivered large torque at slow speed.
As such equipment is adapted to handle different materials supplied in different sizes, problems that have not been encountered previously are arising. One such problem of major importance is the tendency of smaller size equipment, handling harder, smaller size material such as plastic, to stall, sometimes only temporarily, as the material being handled wedges between the rotating drive rotor and the housing or stationary parts mounted to the housing. This wedging of material can occur, for example, between the drive discs of the drive rotor and the housing inner wall or between the hub of the drive rotor and a materials scraper mounted to the inner wall of the housing.
Simply increasing the drive power (i.e., providing a larger drive motor) to overcome the wedging is not, in most instances, an adequate or satisfactory solution to the problem. Cost and space limitations are but two restrictions on simply providing increased drive power. Certain of the materials being handled are not easily breakable, so a larger drive motor simply increases the effect of the material wedging between the rotating drive rotor and the housing or stationary parts mounted to the housing. This can result in a complete stoppage of operation and damage to the equipment. With breakable materials, such coal, the drive torque is large enough to break or pulverize the material into smaller pieces that do not wedge between the rotating drive rotor and the housing or stationary parts mounted to the housing.
Although this adverse wedging effect might not be a regular occurrence and is likely to be different for handling different types of material, when it does occur, even temporarily, it affects accuracy and feeder performance to an unacceptable extent. Because the tendency of the equipment to stall, either temporarily or for longer periods of time, due to this wedging is greater at higher speed operation of the equipment, slowing down the operation of the equipment to reduce the likelihood of material wedging, while possibly reducing the likelihood of wedging, also is unacceptable.
SUMMARY OF THE INVENTION
A bulk materials pump feeder, constructed in accordance with the present invention, includes a housing having an inlet, an outlet, and an inner wall extending from the inlet of the housing to the outlet of the housing. This bulk materials pump feeder also includes a drive rotor having a hub rotatable about a rotation axis and a plurality of drive discs extending away from the hub toward the inner wall of the housing. The distance between the circumferential edges of the drive discs and the inner wall of the housing increases from the inlet of the housing to the outlet of the housing in the direction of rotation of the drive rotor. The inner wall of the housing, the drive discs, and the hub define a materials transfer duct through which material is transferred from the inlet of the housing to the outlet of the housing.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is best understood from the following detailed description when read in connection with the accompanying drawings. Included in the drawings are the following figures.
Figure 1 is an exploded, perspective view of a bulk materials pump feeder constructed in accordance with the present invention.
Figure 2 is a side view of a bulk materials pump feeder constructed in accordance with the present invention.
Figure 3 is a schematic drawing of the relationship between the drive discs and the inner wall of the housing of a bulk materials pump feeder constructed in accordance with the present invention.
Figure 4 is a side view showing the relationship of the Figure 1 drive rotor hub and the Figure 1 materials scraper.
Figure 5 is a side view showing the relationship of the Figure 1 drive rotor hub and a second materials scraper.
DETAILED DESCRIPTION OF THE INVENTION
Referring to Figures 1 and 2, a bulk materials pump feeder, constructed in accordance with the present invention, includes an housing 10 having an inlet 12, an outlet 14, and an inner wall 16 extending from inlet 12 to outlet 14. A bulk materials pump feeder, constructed in accordance with the present invention, is generally similar in construction and operation to the units described and illustrated in U.S. Patent 5,051,041 and U.S. Patent 5,355,993, the contents of which are incorporated herein by reference.
The bulk materials pump feeder of Figures 1 and 2 also has a drive rotor 18 having a hub 20 that is rotatable about a rotation axis 22 and a pair of drive discs 24 which extend away from the hub toward inner wall 16 of housing 10. For the embodiment of the invention being described, hub 20 and drive discs 24 are formed as a single unit. Drive discs 24 can be formed with radially extending discontinuities on the interior faces as described and illustrated in U.S. Patent 5,355,993 to facilitate transfer of material from inlet 12 of housing 10 to outlet 14 of the housing. Preferably, the outside surfaces of drive discs 24 each have a bevel 24a at the circumferential edge of the drive disc for a reason to be explained below.
Drive rotor 18 is mounted in housing 10 for rotation about rotation axis 22 and is held in place by, for example, a screw 25. For the embodiment of the invention illustrated in the drawings and being described, drive rotor 18 has two drive discs 24. Drive rotor 18 can be arranged to have more than two drive discs. The number of drive discs to be included in the drive rotor is dependent on the particular application of bulk materials pump feeder (i.e. , materials being transferred, performance specifications, etc.).
As shown most clearly in Figure 3, which is a schematic drawing of the relationship between drive discs 24 and inner wall 16 of housmg 10, the distance between the circumferential edges of the drive discs and the inner wall of the housing increases from the INLET of the housing to the OUTLET of the housing in the direction of rotation of the drive rotor, which is clockwise as indicated by the arrow for the embodiment of the invention illustrated in the drawings and being described. The drive discs and the inner wall of the housing can be shaped in different ways to provide the desired spacing between the two. For the embodiment of the invention illustrated in the drawings and being described, drive discs 24 are circular and extend away from hub 20 perpendicular to rotation axis 22 of the hub and inner wall 16 of housing 10 is spiral shaped. The spiral shaped inner wall 16 of housing 10 can be defined by the Archimedes spiral equation:
R = θ * a where: "R" is the radius
"θ" is the polar angle "a" is the rate of radial increase given in some unit of measure per angular unit, such as mm/degree The distance between the circumferential edges of the drive discs and the inner wall of the housing is exaggerated in Figure 3 for purposes of illustration.
For the embodiment of the present invention represented by Figure 3, the desired increasing distance between the circumferential edges of the drive discs and the inner wall of the housing is effected by the spiral shape of the inner wall of the housing. This desired increasing distance between the circumferential edges of the drive discs and the inner wall of the housing also can be effected by the design of the drive discs or by a combination of the design of the drive discs and the design of the inner wall of the housing.
Inner wall 16 of housing 10, the inside surfaces of drive discs 24, and hub 20 define a materials transfer duct through which material is transferred from inlet 12 of the housing to outlet 14 of the housing. As drive rotor 18 is rotated by a motor (not shown) coupled to the drive rotor by suitable means, drive discs 24 cause material, introduced into the bulk materials pump feeder through inlet 12 of housing 10, to be transferred to outlet 14 of the housing where the material is discharged from the bulk materials pump feeder. Pieces of material being transferred through this bulk materials pump feeder from the inlet to the outlet that tend to wedge between the inner wall of the housing and the circumferential edges of the drive discs move in the direction of rotation of the drive rotor to a larger spacing between the circumferential edges of the drive discs and the inner wall of the housing and do not wedge because of the increasing space between the circumferential edges of the drive discs and the inner wall of the housing. Instead, this material is discharged through outlet 14. By beveling the outside surfaces of drive discs 24 at the circumferential edges, the surface areas of the circumferential edges of the drive discs are minimized, thereby reducing the tending of material to wedge between the drive discs and the inner wall of the housing.
Referring to Figures 1, 2, and 4, a bulk materials pump feeder, constructed in accordance with the present invention, preferably includes a materials scraper 26 that is mounted in a recess 28 in inner wall 16 of housing 10 downstream from outlet 14 and upstream from inlet 12. Materials scraper 26 extends into drive rotor 18 in the space between the interior faces of drive discs 24 almost touching hub 20.
Certain materials that are transferred through the bulk materials pump feeder will, under certain conditions, cling to drive rotor 18 and not be discharged through outlet 14. Materials scraper 26 scrapes such material from the drive rotor and, generally, this material falls back and is discharged through the outlet.
Materials scraper 28 has two surfaces 30 (only one is illustrated in Figure 1) that face the circumferential edges of drive discs 24. The distance between surfaces 30 of the materials scraper and the circumferential edges of the drive discs increases in the direction of rotation of drive rotor 18 from the distance between inner wall 16 of housing 10 and the circumferential edges of drive discs at outlet 14 of the housing to the distance between the inner wall of the housing and the circumferential edges of the drive discs at inlet 12 of the housing. In particular, surfaces 30 of materials scraper 26 are, in effect, continuations of inner wall 16 of the housing, so that material that is not discharged at outlet 14 that tends to wedge between the materials scraper and the circumferential edges of drive discs 24 moves in the direction of rotation of the drive rotor to a larger spacing between the drive discs and the materials scraper and either falls back and is discharged through the outlet or falls in with material that is introduced at the inlet 12. The increasing space between surfaces 30 of materials scraper 26 and the circumferential edges of drive discs 24, from the OUTLET to the INLET, is illustrated in Figure 3.
Materials scraper 28 that is illustrated in Figures 1 and 4 has a plurality of scraping tips 26a, 26b, and 26c that scrape material that is not discharged at outlet 14. As illustrated in Figure 4, the spacing between materials scraper 26 and hub 20, specifically the spacing between scraping tips 26a, 26b, and 26c and the hub, increases in the direction of rotation of drive rotor 18 from outlet 14 to inlet 12 to reduce, or even eliminate, the tendency of material to wedge between the scraper and the hub. Scraping tips 26a, 26b, and 26c can be points on a spiral or simply points that are spaced from hub 20 the desired distances.
A second form of materials scraper is illustrated in Figure 5. Scraper 26' of Figure 5 has a continuous scraping surface, rather than a plurality of scraping tips as in materials scraper 26 shown in Figure 4. The spacing between the scraping surface of materials scraper 26' and hub 20 increases in the direction of rotation of the from outlet 14 to inlet 12 to reduce, or even eliminate, the tendency of material to wedge between the scraper and the hub. The scraping surface of materials scraper 26' can be spiral shaped.
Although illustrated and described above with reference to certain specific embodiments, the present invention nevertheless is not intended to be limited to the details shown. Rather, various modifications may be made in the details within the scope and range of equivalents of the claims and without departing from the spirit of the invention.

Claims

What is Claimed:
1. A bulk materials pump feeder comprising: a housing having:
(a) an inlet,
(b) an outlet, and
(c) an inner wall extending from said inlet to said outlet; and a drive rotor having:
(a) a hub rotatable about a rotation axis, and
(b) a plurality of drive discs extending away from said hub toward said inner wall of said housing, with the distance between the circumferential edges of said drive discs and said inner wall of said housing increasing from said inlet of said housing to said outlet of said housing in the direction of rotation of said drive rotor; said inner wall of said housing, said drive discs, and said hub defining a materials transfer duct through which material is transferred from said inlet of said housing to said outlet of said housing.
2. A bulk materials pump feeder according to claim 1 wherein said drive discs are mounted to said hub perpendicular to said rotation axis of said hub.
3. A bulk materials pump feeder according to claim 2 wherein:
(a) said drive discs are circular, and
(b) said inner wall of said housing is spiral shaped.
4. A bulk materials pump feeder according to claim 2 wherein:
(a) said drive discs are circular, and
(b) said inner wall of said housing is defined by an Archimedes spiral.
5. A bulk materials pump feeder according to claim 3 wherein said drive rotor has two drive discs.
6. A bulk materials pump feeder according to claim 5 wherein each of said drive discs has:
(a) an inside surface that defines said materials transfer duct, and
(b) an outside surface having a bevel at the circumferential edge of said drive disc.
7. A bulk materials pump feeder according to claim 1 wherein said bulk materials pump feeder further includes a materials scraper: (a) mounted in said housing,
(b) extending into said drive rotor between said drive discs, and
(c) having surfaces facing said circumferential edges of said drive discs, with the distance between said surfaces of said scraper and the circumferential edges of said drive discs increasing in the direction of rotation of said drive rotor from the distance between said inner wall of said housing and the circumferential edges of said drive discs at said outlet of said housing to the distance between said inner wall of said housing and the circumferential edges of said drive discs at said outlet of said housing.
8. A bulk materials pump feeder according to claim 7 wherein said housing further has a recess in said inner wall downstream from said outlet of said housing and upstream from said inlet of said housing relative to the direction of rotation of said drive rotor and said materials scraper is mounted in said recess.
9. A bulk materials pump feeder according to claim 8 wherein said drive discs are mounted to said hub perpendicular to said rotation axis of said hub.
10. A bulk materials pump feeder according to claim 9 wherein:
(a) said drive discs are circular, and
(b) said inner wall of said housing is spiral shaped.
11. A bulk materials pump feeder according to claim 10 wherein said drive rotor has two drive discs.
12. A bulk materials pump feeder according to claim 11 wherein each of said drive discs has:
(a) an inside surface that defines said materials transfer duct, and
(b) an outside surface having a bevel at the circumferential edge of said drive disc.
13. A bulk materials pump feeder according to claim 7 wherein said materials scraper also has a plurality of scraping tips, with the distance between said scraping tips and said hub mcreasing in the direction of rotation of said drive rotor from the distance between said inner wall of said housing and the circumferential edges of said drive discs at said outlet of said housing to the distance between said inner wall of said housing and the circumferential edges of said drive discs at said inlet of said housing.
14. A bulk materials pump feeder according to claim 7 wherein said materials scraper also has a continuous scraping surface, with the distance between said continuous scraping surface and said hub increasing in the direction of rotation of said drive rotor from the distance between said inner wall of said housing and the circumferential edges of said drive discs at said outlet of said housing to the distance between said inner wall of said housing and the circumferential edges of said drive discs at said inlet of said housing.
15. A bulk materials pump feeder according to claim 14 wherein said continuous scraping surface of said materials scraper is spiral shaped.
16. A bulk materials pump feeder comprising: a housing having:
(a) an inlet through which material is introduced into said housing,
(b) an outlet through which material is discharged from said housing, and
(c) an inner wall extending from said inlet to said outlet; and a drive rotor mounted within said housing for rotation about a rotation axis for transferring material introduced into said housing through said inlet of said housing to said outlet of said housing for discharge from said housing, said drive rotor having:
(a) a hub rotatable, and
(b) a plurality of drive discs extending away from said hub toward said inner wall of said housing, with the distance between the circumferential edges of said drive discs and said inner wall of said housing increasing from said inlet of said housing to said outlet of said housing in the direction of rotation of said drive rotor.
17. A bulk materials pump feeder according to claim 16 wherein said bulk materials pump feeder further includes a materials scraper:
(a) mounted in said inner wall of said housing,
(b) extending into said drive rotor between said drive discs, and
(c) having surfaces facing said circumferential edges of said drive discs, with the distance between said surfaces of said scraper and the circumferential edges of said drive discs increasing in the direction of rotation of said drive rotor from the distance between said inner wall of said housing and the circumferential edges of said drive discs at said outlet of said housing to the distance between said inner wall of said housing and the circumferential edges of said drive discs at said outlet of said housing.
18. A bulk materials pump feeder according to claim 17 wherein:
(a) said drive discs are circular, and
(b) said inner wall of said housing is spiral shaped.
19. A bulk materials pump feeder according to claim 18 wherein said materials scraper also has a plurality of scraping tips, with the distance between said scraping tips and said hub increasing in the direction of rotation of said drive rotor from the distance between said inner wall of said housing and the circumferential edges of said drive discs at said outlet of said housing to the distance between said inner wall of said housing and the circumferential edges of said drive discs at said inlet of said housing.
20. A bulk materials pump feeder according to claim 18 wherein said materials scraper also has a continuous scraping surface, with the distance between said continous scraping surface and said hub increasing in the direction of rotation of said drive rotor from the distance between said inner wall of said housing and the circumferential edges of said drive discs at said outlet of said housing to the distance between said inner wall of said housing and the circumferential edges of said drive discs at said inlet of said housing.
PCT/US2003/007869 2002-04-09 2003-03-17 Bulk material pump feeder WO2003087580A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
KR1020047016086A KR100953893B1 (en) 2002-04-09 2003-03-17 Bulk material pump feeder
AU2003220273A AU2003220273A1 (en) 2002-04-09 2003-03-17 Bulk material pump feeder
BRPI0309141-4A BR0309141B1 (en) 2002-04-09 2003-03-17 BULK MATERIAL PUMP FEEDER
EP03716571A EP1495230B1 (en) 2002-04-09 2003-03-17 Bulk material pump feeder
DE60332447T DE60332447D1 (en) 2002-04-09 2003-03-17 PUMP FEEDING DEVICE FOR BULK GOODS
JP2003584500A JP4649110B2 (en) 2002-04-09 2003-03-17 Granule pump feeder

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US10/119,359 US6832887B2 (en) 2002-04-09 2002-04-09 Bulk material pump feeder
US10/119,359 2002-04-09

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US20030190198A1 (en) 2003-10-09
BR0309141A (en) 2005-02-01
EP1495230A1 (en) 2005-01-12
EP1495230B1 (en) 2010-05-05
KR20050003354A (en) 2005-01-10
KR100984495B1 (en) 2010-10-01
BR0309141B1 (en) 2014-04-22
CN1646813A (en) 2005-07-27
JP4649110B2 (en) 2011-03-09
US6832887B2 (en) 2004-12-21
CN100370144C (en) 2008-02-20
DE60332447D1 (en) 2010-06-17
KR100953893B1 (en) 2010-04-22
JP2005522391A (en) 2005-07-28
AU2003220273A1 (en) 2003-10-27
KR20100003374A (en) 2010-01-08

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