CA1043163A - Propeller pump - Google Patents

Propeller pump


Publication number
CA1043163A CA232,039A CA232039A CA1043163A CA 1043163 A CA1043163 A CA 1043163A CA 232039 A CA232039 A CA 232039A CA 1043163 A CA1043163 A CA 1043163A
Prior art keywords
pump housing
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.)
Application number
Other languages
French (fr)
Bengt-Ake Brandt
Bo G. Stjernstrom
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.)
Original Assignee
ITT Industries 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
Priority to SE7409547A priority Critical patent/SE384070B/en
Application filed by ITT Industries Inc filed Critical ITT Industries Inc
Application granted granted Critical
Publication of CA1043163A publication Critical patent/CA1043163A/en
Expired legal-status Critical Current



    • F04D3/00Axial-flow pumps
    • F04D3/005Axial-flow pumps with a conventional single stage rotor
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/52Casings; Connections of working fluid for axial pumps
    • F04D29/54Fluid-guiding means, e.g. diffusers
    • F04D29/548Specially adapted for liquid pumps



Abstract of the Disclosure:

A propeller pump for waste water is supplied which includes a special diffusor having vanes attached to a cylindrical pump housing so that a free central passage is open through the diffusor part, thus diminishing the risks of stoppage from waste material. In addition, the impeller blades are swept backwards and the impeller hub is prolonged forwards and backwards to eliminate winding up of elongated fibres in the pumped medium.


- 2 - ~. A. Brandt et al 4-6 - ~Rev.) BACKGROU~ID Ol;' T}IF, INVENTION
1. Field of the Invention.

This invention concerns a pump of the so called propeller type, which includes a pipe formed as a pump housing and a rotatable impellcr supported thereln.
2. Description of the Prior Art Pumps of this type are often called Axial Flow Pumps, as they are so formed that the pumped medium passes mainly axially through the impeller. In conventional centrifugal pumps, or Radial Flow Pumps, the pumped medium is on the contrary perpendic-- ular linked when it passes the impeller.
~ Pumps of the last mentioned type are very common in a number of fields of application and for use in pumping waste water they have been dominant up to now. A disadvantage with this type of pump is that it, because of its construction, always has a certain limited through-way area, which prevents bigger obiects from passiny.
Furthermore elongated non-rigid objects, for instance ropes and .
strings, may have'a tendency to wind up on the impeller thus causing ~toppage.
- Another disadvantage of radifll pumps, in comparison with axial flow pumps, is that they are of more complicated construc,tion and re~uire a larger amount of material per unit.
It has therefore long appeared desirable to be able to , use pumps of the axial flow type for pumping waste water. This appears especially so when l~rge volumcs of flow are involved, as the savings of materials are more important with larger pump units.
A reduced material demand means naturally both decreased weight and lower costs.

- 2'-10431~3
- 3 - B. ~. Brandt et al 4-6 (Rev.) Up to now, tests of axial flow pumps used for pumping waste water have not been successful, above all oecause of the fact that the efficiencies of such pumps have been too low. In ordcr to obtain an acceptable efficiency, the pump housing must be provided with a diffusor aftcr the impeller, wbich diffusor transfers the moving energy of the pumped medium into pressure energy. Diffusors, which mainly consist of a number of vanes fix~d to a central hub, have proven to be a cause of stoppages of the O pumps.
According to the invention, the problem has been solved by providing the pump housing, at its pressure side, with a number of radial diffusor vanes, which extend inward from the mantle surface of the pump housing and are so formed that a free central passage remains and the diffusor vanes have a decreasing radial extcntion in the dircction towards the pump im~eller.
Brief Description Of The Drawings ~ ~ -The invention is described more closely below with reference to the enclosed drawing, showing an embodiment of the invention in partial section.
Description of a Preferred Embodiment .
!0 In the figurcs, 1 stands for a cylinder formed pump housins with a pump i~pellcr 2, 3 stands for the driving shaft, 4 the impeller blades, 5 the prolongcd inlet collar of the impeller and 6 its extended hub. 7 Stands for the gap between the impeller and the pump housing, 8 rcprescnts the diffusor vancs and 9 an empty ccntral space.
~5 Thc pumpcd mcdiu~ flows in the direction of thc arrows.
In order to prcvcnt material with elongatcd fibers from beincJ wound up around the driving shaft 3, the pump impeller is elongated and ` 1~)431~;3
- 4 - B. A. Brandt et al 4-6~Rev.) terminated with an inlet collar 6 having a relatively big diameter.
This construction enables fibrous material to go further without being wound up.
The impeller blades 4 are secured to a relatively large hub and have a maximum radius which is somewhat smaller than the inner radius of the pump housing, so that a gap occurs between the impeller blades and the pump housing wall. This gap, which is of a size of up to 10~ of the inner diametcr of the pump housing, is provided to assure that material with long fibers will not get stuc~
O between the outer parts of the blades and the pump housing wall.
Further, the lcading edges of the blades are swept backwards thus transporting long fibers outwards against the periphery.
The pump impeller has a hub 6 prolonged backw~rds, which is necessary to reduce the pressure drop after the impeller. The prolonged hub may be formed like a cut cone or a hemisphere. It is important that the sur~ace be smooth so that objecLs do no, stick to the surface but skid off of it. In theory it is possible to replace the prolonged hub by a body of about the same shape attached to the pump housing. In practice, however, it is difficult to attach O it to the pump housing without running the risk of thc attaching means originating stoppages.
The diffusor part, 8, is also formed to minlmize the risk of stoppage.By attaching the vanes to the inner periphery of the pump housing, the conventional diffusor hub is eliminated, thus providing a free central through-way 9. Further, the leading edges of the vanes heading thc flow direction are swept backwards to bring long fibers towards the center and the free through-way 9. The risk of such material causing stoppages is then almost eliminated.
8y a combination of steps according to the invention, a device ha~

, .
. .


- 5 - B.A.Brandt et al 4-6(Rev.) thus been obtained which unites the best qualitics of conventional centrifugal and axial flow pumps regarding efficiency and ability to transport media containing big solid bodies as well as material of a long fiber nature. The pump is primarily meant for pumping of i sewage water but applications in other fiélds are possible.
While the principles of the invelltion have been described a~ove in connection with specific apparatus and applications, it is to be understood that this description is made only by way of example and not as a limitation on the scope of the invention.


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1. A propeller pump comprising a pump housing having a substantially cylindrical section with an interior mantle sur-face, means supporting a rotatable pump impeller in said housing, the housing providing a path for fluid flow along the axis of the pump impeller, the impeller including a number of radial blades to enable high pressure to be supplied near one end of the impeller, the radial blades having outer edges which are spaced-apart from said interior mantle surface to provide a blade-free space within the interior mantle surface forming an annular axial passageway for the passage of fibers therethrough, the pump housing supporting a number of radial diffusor vanes near the high pressure end of the impeller, said diffusor vanes extending inwardly from the mantle surface of the pump housing to leave a free central passage through the housing, and said impeller blades and said diffusor vanes having leading edges swept backwards to promote the movement of fibers toward said annular passageway and said central passage.
CA232,039A 1974-07-23 1975-07-22 Propeller pump Expired CA1043163A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE7409547A SE384070B (en) 1974-07-23 1974-07-23 PROPELLER PUMP

Publications (1)

Publication Number Publication Date
CA1043163A true CA1043163A (en) 1978-11-28



Family Applications (1)

Application Number Title Priority Date Filing Date
CA232,039A Expired CA1043163A (en) 1974-07-23 1975-07-22 Propeller pump

Country Status (11)

Country Link
JP (1) JPS5949435B2 (en)
BR (1) BR7504203A (en)
CA (1) CA1043163A (en)
CS (1) CS191936B2 (en)
DE (1) DE2530214A1 (en)
FR (1) FR2279954B1 (en)
GB (1) GB1510846A (en)
HU (1) HU175761B (en)
IT (1) IT1039300B (en)
NL (1) NL7508481A (en)
SE (1) SE384070B (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3706778A (en) * 1977-10-03 1979-12-20 Rockwell International Corp Axial slurry pump
DE4314477A1 (en) * 1993-05-03 1994-11-10 Klein Schanzlin & Becker Ag Centrifugal pump of axial design
DE4433066C2 (en) * 1994-09-16 2002-08-01 Ksb Ag Semi-axial inlet nozzles for axial pumps
DE19510811A1 (en) * 1995-03-24 1996-09-26 Klein Schanzlin & Becker Ag Fiber-repellent wall surface design
DE10346058A1 (en) * 2003-10-04 2005-04-21 Ksb Ag Centrifugal pump idler
JP4623493B2 (en) * 2004-07-16 2011-02-02 新明和工業株式会社 Detachable submersible pump device
CN104132000B (en) * 2014-07-30 2015-05-20 扬州大学 Elbow-shaped water inlet conduit with excellent hydraulic performance and application method thereof
CN105782121A (en) * 2016-04-07 2016-07-20 扬州大学 Axial flow pump
CN109538482A (en) * 2018-10-29 2019-03-29 江苏大学 A kind of shaft-driven Multi-stage axial-flow pump of single-motor double

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2202790A (en) * 1938-02-23 1940-05-28 Allis Chalmers Mfg Co Waste paper stock pump
JPS50153301A (en) * 1974-05-31 1975-12-10

Also Published As

Publication number Publication date
FR2279954B1 (en) 1979-05-04
CS191936B2 (en) 1979-07-31
HU175761B (en) 1980-10-28
IT1039300B (en) 1979-12-10
FR2279954A1 (en) 1976-02-20
SE7409547L (en) 1976-01-26
NL7508481A (en) 1976-01-27
SE384070B (en) 1976-04-12
JPS5949435B2 (en) 1984-12-03
BR7504203A (en) 1976-07-06
GB1510846A (en) 1978-05-17
JPS5148804A (en) 1976-04-27
DE2530214A1 (en) 1976-02-05

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