Non-clogging, centrifugal, coaxial discharge pump

• US 4,063,849 A
• Filed: 02/12/1975
• Issued: 12/20/1977
• Est. Priority Date: 02/12/1975
• Status: Expired due to Term

• Current Assignee: Doan D. Modianos
• Original Assignee: Doan D. Modianos
• Inventors: Modianos, Doan D.
• Primary Examiner(s): Husar, C. J.
• Application Number:
  US05/549,208
• Time in Patent Office: 1,042 Days
• Field of Search: 415/219, 415/501, 415/502, 415/213 R, 415/206, 415/199 A, 415/211, 415/207, 415/210, 415/209, 415/215, 415/191, 415/192, 415/193, 415/194, 415/213, 416/186, 417/424
• US Class Current: 415/210.1
• CPC Class Codes: F04D 29/183 Semi axial flow rotors
• CPC Class Codes: F04D 29/445 especially adapted for liquid pumps
• CPC Class Codes: F04D 29/548 Specially adapted for liquid pumps F04D29/56 takes precedence
• CPC Class Codes: F04D 7/045 with means for comminuting, mixing stirring or otherwise treating
• CPC Class Codes: F05B 2240/121 Baffles or ribs

Abstract

A rotatably driven, hydrodynamic, centrifugal coaxial discharge pumping apparatus for moving fluids or flows of sludge or streams with trash or solids mixed therein with a single suction, diffusion casing pump. The pump has a vertical housing with an axial fluid flow upwardly through the housing. The pump is designed to operate with a submerged inlet having non-clog and other features that are especially useful for pumping fluids flowing in sanitary and storm sewer lines, for example.

Claims

1. A non-clogging pump for moving mixed solid and fluid flows such as sewage and similar sludges comprising

an elongated housing means disposed with its axis arranged generally vertically, said housing means having a flow passage therethrough for said fluid and having a suction bell inlet to said passage at its lower end and an outlet from said passage at its upper end,

a rotatably driven pump impeller confined within the housing above the inlet end of said housing for raising and moving fluid in said passage from below the inlet to the outlet,

the passage in the housing including an impeller portion and a diffusion zone between the pump impeller and the outlet,

said impeller including a plurality of spiral shaped vanes, each of said vanes having a rounded nose and a streamlined configuration,

means to drive said impeller to produce an upwardly moving tangential fluid flow in said passage,

stationary vane means in said diffusion zone, said stationary vane means having a rounded nose and a streamlined configuration, and

the nose end of said stationary vane means being positioned to face directly into the fluid flow from the impeller means,

the body of said stationary vane means beyond its nose gradually straightening out in the direction of fluid flow through the diffusion zone and terminating in a vertically disposed portion at the outlet,

the impeller portion of said housing above said inlet being of inverted generally conical shape and said impeller being confined substantially within said cone,

said drive means for said impeller including a rotatably driven shaft extending vertically through the housing,

said impeller being secured to the lower end of said drive shaft for rotation therewith,

said impeller including inverted truncated generally conical shroud elements integral with said impeller vanes, and

said shroud elements being spaced apart in generally parallel relationship to the inverted conical housing whereby to form a confined diverging fluid flow passage through the impeller for accelerating the movement of fluid over said vanes.

2. A non-clogging pump for moving mixed solid and fluid flows such as sewage and similar sludges comprising

an elongated housing means disposed with its axis arranged generally vertically, said housing means having a flow passage therethrough for said fluid and having a suction bell inlet to said passage at its lower end and an outlet from said passage at its upper end,

a rotatably driven pump impeller confined within the housing above the inlet end of said housing for raising and moving fluid in said passage from below the inlet to the outlet,

the passage in the housing including an impeller portion and a diffusion zone between the pump impeller and the outlet,

said impeller including a plurality of vanes, each of said vanes having a rounded nose and a streamlined configuration,

means to drive said impeller to produce an upwardly moving tangential fluid flow in said passage,

stationary vane means in said diffusion zone, said stationary vane means having a rounded nose and a streamlined configuration, and

the nose end of said stationary vane means being positioned to face directly into the fluid flow from the impeller means,

the body of said stationary vane means beyond its nose gradually straightening out in the direction of fluid flow through the diffusion zone and terminating in a vertically disposed portion at the outlet,

the impeller portion of said housing above said inlet being generally in the shape of an inverted cone and said impeller being confined substantially within said cone,

said drive means for said impeller including a rotatably driven shaft extending vertically through the housing,

said impeller being secured to the lower end of said drive shaft for rotation therewith,

said impeller including inverted truncated generally conical shroud elements integral with said impeller vanes,

said shroud elements being spaced apart in generally parallel relationship to the cone of the housing whereby to form a confined diverging fluid flow passage through the impeller for accelerating the movement of fluid over said vanes,

said diffusion zone includes a correspondingly diverging entrance to the fluid passage in said zone to receive the fluid from the impeller,

said passage beyond the entrance to the diffusion zone being shaped to converge the fluid flow inwardly toward the axis to the housing as it flows upwardly in the diffusion zone to said outlet,

the fluid passage in said diffusion zone being defined by the outer wall of said housing and an inner wall spaced therefrom,

said inner wall being a generally upright conical shape supported from said outer wall by said stationary vane means, and

said stationary vane means comprises two vanes which merge together and form a single vane means at the top of the upright conical inner wall.

3. A structure as defined in claim 2 wherein

said outlet from the housing includes a 90°

elbow to deliver the fluid into a horizontally disposed conduit and

said vertically disposed vane extends through the elbow substantially to said conduit.

4. A structure as defined in claim 3 wherein

the vertical vane in said elbow coincides with a vertical plane defined by the sweep of the raidus of the elbow.

5. A structure as defined in claim 4 wherein

said vertical vane in the diffusion zone has an enlarged hollow axially aligned center body portion and

said enlarged hollow part of the body portion in said vane constituting a housing for said vertically extending drive shaft.

6. A non-clogging pump for moving mixed solid and fluid flows such as sewage and similar sludges comprising

an elongated housing means disposed with its axis arranged generally vertically, said housing means having a flow passage therethrough for said fluid and having an inlet to said passage at its lower end and an outlet from said passage at its upper end,

a rotatably driven pump impeller confined within the housing above the inlet end of said housing for raising and moving fluid in said passage from below the inlet to the outlet,

the passage in the housing including a diffusion zone between the pump impeller and the outlet,

said impeller including a plurality of vanes, each of said vanes having a rounded nose and a streamlined configuration,

means to drive said impeller to produce an upwardly moving tangential fluid flow in said passage,

stationary vane means in said diffusion zone, said stationary vane means having a rounded nose and a streamlined configuration,

the nose end of said stationary vane means being positioned to face directly into the fluid flow from the impeller means,

the body of said stationary vane means beyond its nose gradually straightening out in the direcrion of fluid flow through the diffusion zone and terminating in a vertically disposed portion at the outlet,

the fluid passage in said diffusion zone is defined by the outer wall of the housing and an inner upright by the outer wall of the housing and an inner upright generally conical wall, and

said conical wall being supported from said housing by said stationary vane means.

7. A structure as defined in claim 6 wherein

said upright cone is axially aligned with the axis of said housing and said stationary vane means comprise two vanes each of which become straightened out,

said vanes being joined together to form an integral vane means at the top of the upright conical inner wall.

8. A structure as defined in claim 7 wherein

said outlet from the housing includes a 90°

elbow to deliver the fluid into a horizontally disposed conduit and

said vertically disposed vane extends through the elbow substantially to said conduit.

9. A structure as defined in claim 8 wherein

the vertically disposed vane coincides with a vertical plane defined by the sweep of the radius of the elbow.

10. A structure as defined in claim 9 wherein

said vertical vane in the diffusion zone has an enlarged hollow axially aligned center body portion,

said impeller drive means including a vertically disposed drive shaft, and

said enlarged hollow part of the body portion in said vane constituting a housing for said drive shaft.

11. A structure as defined in claim 9 wherein said impeller is secured on the lower end of said drive shaft.

12. A non-clogging centrifugal pump for moving mixed solid and fluid flows such as sewage and similar sludges comprising

a housing having an inlet and outlet and a generally vertically disposed axis,

impeller means at said inlet, said impeller means being operative to produce a radially outward and axially upward somewhat tangential fluid flow, and

a diffusion zone in said housing having inner and outer walls to define a flow passage, said walls being defined by surfaces of revolution and being arranged to receive the fluid flow from said impeller means,

a pair of diffuser vanes in said flow passage, each of said diffuser vanes having rounded noses and bodies that are streamlined in cross section, the nose of each of said diffuser vanes being turned to face into said on-coming fluid flow from the impeller means, and the remainder of the body of each of said diffuser vanes being turned to straighten up to coincide with the axis of said housing, and

said vanes being merged together after their bodies become straightened to form a single vertical vane in said diffusion zone.

13. A structure as defined in claim 12 wherein

said outlet takes the form of a discharge elbow and said vertical vane extends through said elbow, and said vane lies in a plane that includes the axis of the housing and an arc generated by the sweep of the radius of curvature of the elbow.

14. A non-clogging centrifugal pump for moving mixed solid and fluid flows such as sewage and similar sludges comprising

a housing having an inlet and outlet and a generally vertically disposed axis,

impeller means at said inlet, said impeller means being operative to produce a radially outward and axially upward somewhat tangential fluid flow, and

a diffusion zone in said housing having inner and outer walls to define a flow passage, said walls being defined by surfaces of revolution and being arranged to receive the fluid flow from said impeller means,

a pair of diffuser vanes in said flow passage, each of said diffuser vanes having rounded noses and bodies that are streamlined in cross section, the nose of each of said diffuser vanes being turned to face into said on-coming fluid flow from the impeller means and the remainder of the body of each of said diffuser vanes being turned to straighten up to coincide with the axis of said house, and

each diffuser vane including a leading end and trailing end and a transverse centerline having a curved portion, a maximum thickness of between 5% and 12% of the length of the curved portion of the centerline, the curvature of the leading end having a diameter equal to 70% of the maximum thickness, and the point of maximum thickness is about 26% of the length of the curved portion of the centerline displaced from the leading end.

15. A structure as defined in claim 14 wherein the maximum thickness is 10% of the length of the centerline and the nose diameter is 70% of the maximum thickness.

16. A structure as defined in claim 14 in which

said impeller includes generally spirally arranged vanes having rounded noses and bodies that are streamlined in cross section to produce an outwardly radial and upwardly moving flow of fluid, and

in which the vanes of the impeller each have leading and trailing ends and a transverse center line, a maximum thickness between 5% to 12% of the length of the center line, and with the curvature of the nose having a diameter equal to 70% of the maximum thickness and the point of maximum thickness being 26% of the length of the center line from the leading edge of the vane.