US3156190A - Pump impeller - Google Patents

Pump impeller Download PDF

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Publication number
US3156190A
US3156190A US265131A US26513163A US3156190A US 3156190 A US3156190 A US 3156190A US 265131 A US265131 A US 265131A US 26513163 A US26513163 A US 26513163A US 3156190 A US3156190 A US 3156190A
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Prior art keywords
hub portion
flaring
screw blade
hub
offset
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Expired - Lifetime
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US265131A
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Stahle Martin
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Hidrostal SA
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Hidrostal SA
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Priority to US265131A priority Critical patent/US3156190A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F04D3/02—Axial-flow pumps of screw type
    • 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
    • F04D29/181—Axial flow rotors
    • F04D29/183—Semi axial flow rotors

Definitions

  • Another object is to provide a novel form of impeller for a rotary pump.
  • FIGURE 1 is a sectional view showing a preferred embodiment of this invention
  • FIGURE 2 is a front elevation taken substantially on the lines 2-2 as shown in FIGURE 1;
  • FIGURE 3 is a sectional view showing a modification.
  • the pump assembly generally designated includes a casing 11 and a rotary impeller 12.
  • the casing 11 includes a chamber portion 13, having an outlet 14, and also includes a tapered inlet portion 15.
  • the tapered inlet portion 15 has a flaring inlet bore 16, leading from a restricted inlet opening 17 to the volute chamber 18 in the casing 11.
  • the inlet pipe 19 is flange connected to the small end of the taper portion 15 of the casing 11.
  • the impeller 12 is mounted to rotate on the casing 11 and is provided with a first flaring hub portion 21 concentrically mounted in said flaring inlet bore 16 and flaring in the same axial direction but having substantially lesser diameter. Said hub portion 21 extends into said volute outlet chamber 18. A second hub portion 26 merges with the first hub portion 21 and extends upstream and converges from the first hub portion. This second hub portion 26 has an axis 27 angularly oflset with respect to the axis of rotation of the first hub portion 21 and merges therewith so as to provide a continuous, smooth surface with said first hub portion 21.
  • a single continuous spiral screw blade 22 is fixed to and encircles the surface of the first hub portion 21 and second hub portion 26 and has an outer periphery 23 defining a flaring surface indicated by the phantom lines 24.
  • the screw blade 22 is of substantially constant thickness and smoothly merges with and covers the small end of the hub 21 and extends upstream into the tapered bore 16 beyond the end of the first hub portion 21.
  • the extending portion terminates in a leading end 25 offset from the rotary axis of the impeller.
  • the leading end 25 is inclined to the rotary axis of the first hub portion 21.
  • the surface of revolution 24 defined by rotation of the outer edge or periphery 23 is concentric with said flaring inlet bore 16 and is closely adjacent thereto.
  • the clearance between the periphery 23 of the screw blade 22 and the conical bore 16 varies from minimum clearance at the leading end 25 to maximum clearance at the large end of the screw blade 22.
  • the screw blade 22 has a root portion 28 engaging and merging into a smooth surface with said axially extending second hub portion 26, so that no abrupt shoulder is formed between said root portion 28 of the screw blade 22 and the surface of the offset second hub portion 26.
  • the diameter of the concentric inlet opening 17 is preferably less than the diameter of the circle traversed by the leading end 25, so that any solid material which passes through the inlet opening 17 with the liquid does not hang up or accumulate at any point on the impeller, but, on the contrary, is carried along between convolutions of the screw blade 22 into the volute chamber 18 and out through the outlet 14.
  • the small end of the first hub portion 21 is shown in phantom lines 21a, but in reality there is no central point at the apex of the hub because it is covered by and merged with the second hub portion 26.
  • FIGURE 1 While the bore 16 and the surface revolution 24 have both been shown in FIGURE 1 as being conical, it is to be understood that these surfaces need not be strictly conical, but may be curved in cross section to form a flaring bore and a flaring surface of revolution.
  • the hub 21 may be similarly curved.
  • a flaring or conical sleeve 30 forms a part of the impeller 12a and is fixed to the outer periphery 23a of the spiral screw blade 22a.
  • a spiral passage 31 is thus formed between the tapered sleeve 3%) and the screw blade 22a.
  • This passage 31 extends from the small end of the impeller 12a to the volute chamber 18a.
  • the device of FIGURE 3 is similar to that described above.
  • a casing having a volute outlet chamber and a flaring inlet bore defined by a surface of revolution, the large end of said flaring inlet bore opening into said volute outlet chamber, an impeller mounted to rotate within said flaring inlet bore, said impeller having a first flaring hub portion concentrically mounted in said flaring inlet bore and flaring in the same axial direction but having a substantial lesser diameter and extending into said volute outlet chamber, a second offset hub portion merging with the first hub portion and extending upstream and converging from the first hub portion and having an axis angularly oflset with respect to the axis of the first hub portion, and merging therewith so as to provide a smooth continuous sur face with said first flaring hub portion, a single continuous spiral screw blade of substantially constant thickness encircling said first and second hub portions and extending axially upstream from said second oifset hub portion, said screw blade having a leading end inclined to said axis of said first hub portion and said screw blade having

Description

United States Patent 3,156,190 PUMP IMPELLER Martin Stiihle, Hidrostal, Jiron Huaraz 951 Brena, Lima, Peru Filed Mar. 14, 1963, Ser. No. 265,131 2 Claims. (Cl. 10388) This invention relates to improvements in rotary pumps and is particularly directed to a pump having a novel form of impeller which contributes to efficient handling of mixtures of liquids and solids. Mushy, pulpy, pasty, or fibrous materials contained in water may be handled without clogging the parts of the pump.
This application is a continuation-in-part of my copending application, Serial No. 141,251, filed September 25, 1961, for Single-Blade Centrifugal Pump Impeller, now abondoned.
It is an important object of this invention to provide an improved pump assembly having a rotary impeller incorporating a spiral screw blade, the screw blade having an outer periphery defining a flaring surface of revolution, the blade having a pointed end offset from the rotary axis of the impeller, and shaped so that no central projection is provided in which solids may hang up or accumulate to cause clogging.
Another object is to provide a novel form of impeller for a rotary pump.
Other and more detailed objects and advantages will appear hereinafter.
In the drawings:
FIGURE 1 is a sectional view showing a preferred embodiment of this invention;
FIGURE 2 is a front elevation taken substantially on the lines 2-2 as shown in FIGURE 1; and
FIGURE 3 is a sectional view showing a modification.
Referring to the drawings, the pump assembly generally designated includes a casing 11 and a rotary impeller 12. The casing 11 includes a chamber portion 13, having an outlet 14, and also includes a tapered inlet portion 15. The tapered inlet portion 15 has a flaring inlet bore 16, leading from a restricted inlet opening 17 to the volute chamber 18 in the casing 11. The inlet pipe 19 is flange connected to the small end of the taper portion 15 of the casing 11.
The impeller 12 is mounted to rotate on the casing 11 and is provided with a first flaring hub portion 21 concentrically mounted in said flaring inlet bore 16 and flaring in the same axial direction but having substantially lesser diameter. Said hub portion 21 extends into said volute outlet chamber 18. A second hub portion 26 merges with the first hub portion 21 and extends upstream and converges from the first hub portion. This second hub portion 26 has an axis 27 angularly oflset with respect to the axis of rotation of the first hub portion 21 and merges therewith so as to provide a continuous, smooth surface with said first hub portion 21. A single continuous spiral screw blade 22 is fixed to and encircles the surface of the first hub portion 21 and second hub portion 26 and has an outer periphery 23 defining a flaring surface indicated by the phantom lines 24. The screw blade 22 is of substantially constant thickness and smoothly merges with and covers the small end of the hub 21 and extends upstream into the tapered bore 16 beyond the end of the first hub portion 21. The
extending portion terminates in a leading end 25 offset from the rotary axis of the impeller. The leading end 25 is inclined to the rotary axis of the first hub portion 21. The surface of revolution 24 defined by rotation of the outer edge or periphery 23 is concentric with said flaring inlet bore 16 and is closely adjacent thereto. The clearance between the periphery 23 of the screw blade 22 and the conical bore 16 varies from minimum clearance at the leading end 25 to maximum clearance at the large end of the screw blade 22. The screw blade 22 has a root portion 28 engaging and merging into a smooth surface with said axially extending second hub portion 26, so that no abrupt shoulder is formed between said root portion 28 of the screw blade 22 and the surface of the offset second hub portion 26.
The diameter of the concentric inlet opening 17 is preferably less than the diameter of the circle traversed by the leading end 25, so that any solid material which passes through the inlet opening 17 with the liquid does not hang up or accumulate at any point on the impeller, but, on the contrary, is carried along between convolutions of the screw blade 22 into the volute chamber 18 and out through the outlet 14.
The small end of the first hub portion 21 is shown in phantom lines 21a, but in reality there is no central point at the apex of the hub because it is covered by and merged with the second hub portion 26.
While the bore 16 and the surface revolution 24 have both been shown in FIGURE 1 as being conical, it is to be understood that these surfaces need not be strictly conical, but may be curved in cross section to form a flaring bore and a flaring surface of revolution. The hub 21 may be similarly curved.
In a modified form of the device shown in FIGURE 3, a flaring or conical sleeve 30 forms a part of the impeller 12a and is fixed to the outer periphery 23a of the spiral screw blade 22a. A spiral passage 31 is thus formed between the tapered sleeve 3%) and the screw blade 22a.
This passage 31 extends from the small end of the impeller 12a to the volute chamber 18a. In other respects, the device of FIGURE 3 is similar to that described above.
Having fully described my invention, it is to be understood that I am not to be limited to the details herein set forth, but that my invention is of the full scope of the appended claims.
I claim:
1. In a pump, the combination of a casing having a volute outlet chamber and a flaring inlet bore defined by a surface of revolution, the large end of said flaring inlet bore opening into said volute outlet chamber, an impeller mounted to rotate within said flaring inlet bore, said impeller having a first flaring hub portion concentrically mounted in said flaring inlet bore and flaring in the same axial direction but having a substantial lesser diameter and extending into said volute outlet chamber, a second offset hub portion merging with the first hub portion and extending upstream and converging from the first hub portion and having an axis angularly oflset with respect to the axis of the first hub portion, and merging therewith so as to provide a smooth continuous sur face with said first flaring hub portion, a single continuous spiral screw blade of substantially constant thickness encircling said first and second hub portions and extending axially upstream from said second oifset hub portion, said screw blade having a leading end inclined to said axis of said first hub portion and said screw blade having an outer edge that on the rotation thereof said edge defines a surface of revolution concentric with said flaring inlet bore and closely adjacent thereto, and said screw blade having a root portion engaging and merging into a smooth surface with said offset axially extending second hub portion so that no abrupt shoulder is formed between said root portion of the screw blade and the surface of said offset second portion of the hub.
2. The combination set forth in claim 1 in which a flaring sleeve is fixed on the outer periphery of the screw blade to enclose it within the flaring inlet bore.
References Cited in the file of this patent UNITED STATES PATENTS Schetzel Sept. 13, Hutchinson Aug. 18, Chapman Feb. 8, Hanna Dec. 3, Schmidt Sept. 17, Nickerson July 28, Geske Jan. 1,
FOREIGN PATENTS Austria Oct. 25, Great Britain Jan. 25, France Apr. 29,
Germany Nov. 26,

Claims (1)

1. IN A PUMP, THE COMBINATION OF A CASING HAVING A VOLUTE OUTLET CHAMBER AND A FLARING INLET BORE DEFINED BY A SURFACE OF REVOLUTION, THE LARGE END OF SAID FLARING INLET BORE OPENING INTO SAID VOLUTE OUTLET CHAMBER, AN IMPELLER MOUNTED TO ROTATE WITHIN SAID FLARING INLET BORE, SAID IMPELLER HAVING A FIRST FLARING HUB PORTION CONCENTRICALLY MOUNTED IN SAID FLARING INLET BORE AND FLARING IN THE SAME AXIAL DIRECTION BUT HAVING A SUBSTANTIAL LESSER DIAMETER AND EXTENDING INTO SAID VOLUTE OUTLET CHAMBER, A SECOND OFFSET HUB PORTION MERGING WITH THE FIRST HUB PORTION AND EXTENDING UPSTREAM AND CONVERGING FROM THE FIRST HUB PORTION AND HAVING AN AXIS ANGULARLY OFFSET WITH RESPECT TO THE AXIS OF THE FIRST HUB PORTION, AND MERGING THEREWITH SO AS TO PROVIDE A SMOOTH CONTINUOUS SURFACE WITH SAID FIRST FLARING HUB PORTION, A SINGLE CONTINUOUS SPIRAL SCREW BLADE OF SUBSTANTIALLY CONSTANT THICKNESS ENCIRCLING SAID FIRST AND SECOND HUB PORTIONS AND EXTENDING AXIALLY UPSTREAM FROM SAID SECOND OFFSET HUB PORTION, SAID SCREW BLADE HAVING A LEADING END INCLINED TO SAID AXIS OF SAID FIRST HUB PORTION AND SAID SCREW BLADE HAVING AN OUTER EDGE THAT ON THE ROTATION THEREOF SAID EDGE DEFINES A SURFACE OF REVOLUTION CONCENTRIC WITH SAID FLARING INLET BORE AND CLOSELY ADJACENT THERETO, AND SAID SCREW BLADE HAVING A ROOT PORTION ENGAGING AND MERGING INTO A SMOOTH SURFACE WITH SAID OFFSET AXIALLY EXTENDING SECOND HUB PORTION SO THAT NO ABRUPT SHOULDER IS FORMED BETWEEN SAID ROOT PORTION OF THE SCREW BLADE AND THE SURFACE OF SAID OFFSET SECOND PORTION OF THE HUB.
US265131A 1963-03-14 1963-03-14 Pump impeller Expired - Lifetime US3156190A (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2408741A1 (en) * 1977-10-13 1979-06-08 Sulzer Ag CENTRIFUGAL PUMP
JPS5535189A (en) * 1978-08-31 1980-03-12 Staehle Martin Centrifugal pump
US4193737A (en) * 1977-09-22 1980-03-18 Lemmon George H Fish pump
EP0011506A1 (en) * 1978-11-17 1980-05-28 Spp Group Limited Single vane rotodynamic impeller
US4789299A (en) * 1987-10-30 1988-12-06 Kris Demetrius Liquid and air pump B
WO1992021388A1 (en) * 1991-05-29 1992-12-10 Fundação Adib Jatene Pump
EP0527227A1 (en) * 1991-02-28 1993-02-17 Ishigaki Mechanical Industry Co. Ltd. Pump having spiral blades
US5413460A (en) * 1993-06-17 1995-05-09 Goulds Pumps, Incorporated Centrifugal pump for pumping fiber suspensions
US5487644A (en) * 1987-02-13 1996-01-30 Ishigaki Mechanical Industry Co., Ltd Pump having a single or a plurality of helical blades
DE19717458A1 (en) * 1997-04-25 1998-10-29 Klein Schanzlin & Becker Ag Centrifugal pump
US5997242A (en) * 1996-12-02 1999-12-07 Alden Research Laboratory, Inc. Hydraulic turbine
EP1335134A1 (en) * 2002-02-04 2003-08-13 Ching-Yuan Chiang Motor and its blade unit
EP2169234A2 (en) * 2007-07-17 2010-03-31 Gerardus Augustinus Maria Manshanden Sinking pump safe for fish
EP2858893A1 (en) 2012-06-06 2015-04-15 G.A.M. Manshanden Management B.V. Ship screw, pump screw or turbine screw
WO2018235105A1 (en) * 2017-06-22 2018-12-27 Cri Pumps Private Limited Helical impeller

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US482655A (en) * 1892-09-13 Apparatus for the propulsion and transmission of water
US566179A (en) * 1896-08-18 Philip h
US1170512A (en) * 1911-05-04 1916-02-08 American Well Works Pump.
FR493371A (en) * 1916-04-28 1919-08-07 Alexandre Marie Germain Perrie Propeller-turbine applicable to aerial propellers and marine propellers
US2223988A (en) * 1934-05-23 1940-12-03 Hanna William Thompson Stoker mechanism
DE714289C (en) * 1939-04-20 1941-11-26 Adolf Volbracht Centrifugal pump impeller
US2407748A (en) * 1943-12-28 1946-09-17 Lombard Governor Corp Rotary pump
GB743868A (en) * 1953-05-26 1956-01-25 Jessie A Davis Foundation Inc Improvements in or relating to pumps
US2897025A (en) * 1955-12-19 1959-07-28 Crane Co Fuel pump bearing
AT211677B (en) * 1959-07-08 1960-10-25 Johann Winsauer Slurry pump
US3071194A (en) * 1961-02-13 1963-01-01 William C Geske Marine drive assembly

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US482655A (en) * 1892-09-13 Apparatus for the propulsion and transmission of water
US566179A (en) * 1896-08-18 Philip h
US1170512A (en) * 1911-05-04 1916-02-08 American Well Works Pump.
FR493371A (en) * 1916-04-28 1919-08-07 Alexandre Marie Germain Perrie Propeller-turbine applicable to aerial propellers and marine propellers
US2223988A (en) * 1934-05-23 1940-12-03 Hanna William Thompson Stoker mechanism
DE714289C (en) * 1939-04-20 1941-11-26 Adolf Volbracht Centrifugal pump impeller
US2407748A (en) * 1943-12-28 1946-09-17 Lombard Governor Corp Rotary pump
GB743868A (en) * 1953-05-26 1956-01-25 Jessie A Davis Foundation Inc Improvements in or relating to pumps
US2897025A (en) * 1955-12-19 1959-07-28 Crane Co Fuel pump bearing
AT211677B (en) * 1959-07-08 1960-10-25 Johann Winsauer Slurry pump
US3071194A (en) * 1961-02-13 1963-01-01 William C Geske Marine drive assembly

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4193737A (en) * 1977-09-22 1980-03-18 Lemmon George H Fish pump
FR2408741A1 (en) * 1977-10-13 1979-06-08 Sulzer Ag CENTRIFUGAL PUMP
JPS5535189A (en) * 1978-08-31 1980-03-12 Staehle Martin Centrifugal pump
US4347035A (en) * 1978-08-31 1982-08-31 Staehle Martin Centrifugal pump with single blade impeller
JPS6213518B2 (en) * 1978-08-31 1987-03-26 Staehle Martin
EP0011506A1 (en) * 1978-11-17 1980-05-28 Spp Group Limited Single vane rotodynamic impeller
WO1980001095A1 (en) * 1978-11-17 1980-05-29 G Lake Single vane rotodynamic impeller
US5487644A (en) * 1987-02-13 1996-01-30 Ishigaki Mechanical Industry Co., Ltd Pump having a single or a plurality of helical blades
US4789299A (en) * 1987-10-30 1988-12-06 Kris Demetrius Liquid and air pump B
EP0527227A4 (en) * 1991-02-28 1993-07-28 Ishigaki Mechanical Industry Co. Ltd. Pump having spiral blades
EP0527227A1 (en) * 1991-02-28 1993-02-17 Ishigaki Mechanical Industry Co. Ltd. Pump having spiral blades
WO1992021388A1 (en) * 1991-05-29 1992-12-10 Fundação Adib Jatene Pump
US5413460A (en) * 1993-06-17 1995-05-09 Goulds Pumps, Incorporated Centrifugal pump for pumping fiber suspensions
US5997242A (en) * 1996-12-02 1999-12-07 Alden Research Laboratory, Inc. Hydraulic turbine
DE19717458A1 (en) * 1997-04-25 1998-10-29 Klein Schanzlin & Becker Ag Centrifugal pump
US6343909B1 (en) 1997-04-25 2002-02-05 Ksb Aktiengesellschaft Centrifugal pump
EP1335134A1 (en) * 2002-02-04 2003-08-13 Ching-Yuan Chiang Motor and its blade unit
EP2169234A2 (en) * 2007-07-17 2010-03-31 Gerardus Augustinus Maria Manshanden Sinking pump safe for fish
EP2858893A1 (en) 2012-06-06 2015-04-15 G.A.M. Manshanden Management B.V. Ship screw, pump screw or turbine screw
WO2018235105A1 (en) * 2017-06-22 2018-12-27 Cri Pumps Private Limited Helical impeller
CN109964043A (en) * 2017-06-22 2019-07-02 希阿埃水泵私人有限公司 Helical runner
EP3642490A4 (en) * 2017-06-22 2021-03-17 CRI Pumps Private Limited Helical impeller

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