US3025799A

US3025799A - hallerback

Info

Publication number: US3025799A
Authority: US
Publication date: 1962-03-20
Anticipated expiration: 1979-03-20

Description

United States Patent 3,025,799 IMMERSIBLE DRAINAGE PUMPS Stig Lennart Hallerbick, Sodertalje, Sweden, assignor to Alrtlebolaget W. Dan Bergman, Sodertalje, Sweden, 21 joint-stool: company of Sweden Filed Dec. 30, 1959, Ser. No. 862,823 Claims. (Cl. 103-87) This invention relates to pumps, and particularly to immersible drainage pumps. 2

It is an object of the invention to provide in an immersible drainage pump having an inner casing enclosing an electric drive motor, an outer casing enclosing a bladed pump impeller and assembled of a number of components which are shaped and joined in such a way as to readily permit the exchange of the impeller and associated par-ts to make the pump suited to different operating conditions.

With this and other objects in view, I provide an immersible drainage pump comprising an outer casing, an inner casing, a bladed pump impeller disposed within said outer casing and an electric drive motor disposed within said inner casing and connected to rotate said impeller to make the latter induce a flow of fluid which is drawn into said outer casing at the bottom thereof, is propelled upwards through a passage between said inner and said outer casing, and is delivered from the top of said outer casing, said outer casing being formed of three components, one base member, one intermediate member, and one top member, said components being joined together along planes perpendicular to the pump axis, said base member extending from the bottom of said outer casing and having its upper end level with the bottom end of said inner casing, said base member forming an impeller casing and being joined to said intermediate casing member through means of fixation such as bolt members, there being fluid inlet ports in said impeller casing and fluid flow guiding means such as guide vanes upstream and downstream the impeller, said top casing member extending from said intermediate casing member and detachably secured to the latter with means of fixation such as bolt members, said intermediate member being comparatively low and being secured to the bottom end portion of said inner casing by strut means integral with said intermediate member and said inner casing.

Preferred embodiments of the invention will be described hereinafter, reference being had to the accompanying drawings.

FIG. 1 is a sectional elevation through a drainage pump according to the invention.

FIG. 2 is a cross section view of the outer and inner casing at the level of the drive motor.

FIG. 3 is a sectional elevation of the bottom portion of a drainage pump provided with an impeller of a modified shape.

FIG. 4 is a sectional elevation similar to that in FIG. 3, and illustrating the base portion of a drainage pump provided with a divided two-stage impeller.

Referring to FIG. 1 the pump illustrated therein comprises an outer casing 1 and an inner casing 2, the latter enclosing an electric drive motor with associated shaft bearing and sealing means. The motor drive shaft 3 protruding from the inner casing 2 at its lower end carries a bladed pump impeller 4. The drive motor, the shaft bearing means and shaft sealing means will not be specifically described as they form no part of the present invention.

The outer casing 1 is formed of an upper member 5, an intermediate member 6 and a base member 7, the latter affording an impeller housing. The outer casing is separated into the said three members along planes perpendicular to the vertical longitudinal axis of the pump. The upper casing member 5 is joined to the intermediate member 6 by means of bolts or screws (not illustrated) in a manner known in itself, and the intermediate and

base members

6, 7 are joined together in a similar way. The outer casing consequently forms a rigid supporting structure. The interconnecting bolts or screws preferably are disposed within the casing. The plane of division between the impeller housing and the intermediate member 6 lies substantially on a level with the bottom of the inner casing, and also with the top of the impeller, the latter being accommodated completely within its housing 7. In the impeller housing 7 inlet guide vanes 8 and preferably also outlet guide vanes 9 are provided, and further a cylindrical strainer 10 is disposed around the lower portion of the housing to prevent solid matter to enter the impeller and obstruct the pump. The strainer 10 is retained in its position by a bottom plate 11, detachably secured to the impeller housing as by screw means.

The intermediate casing member 6 is connected to the inner casing 2 by means of radially extending struts 12 which are formed integrally with said members and preferably are shaped as downstream extensions of outlet guide vanes '9.

To further improve the fluid flow through the pump, guide ribs 13 are provided in the annular passage between the inner and outer casing, said ribs being preferably formed integral with the inner casing. Those ribs extend across the annular passage and preferably along the whole length of the inner casing 2. As illustrated in FIG. 2 the ribs '13 may be hollow with their interior space communicating with the air space within the inner casing which will improve the air cooling of the stator windings disposed within the inner casing.

In order to adapt the pump to altered operating conditions the impeller and the impeller housing with associated guide vanes may'easily be exchanged against other corresponding elements which are suited to those new conditions. In such case the strainer .10 and the bottom plate 11 need not be exchanged since those elements, as

i will also be evident from FIGS. 1, 3 and 4, are common to all impeller housings.

When the impeller and guide vanes shall be changed, the parts 11 and .10 are first removed, and thereafter the impeller housing 7 is detached by removing the screws or bolts securing it to the intermediate member 6. After the impeller 4 has been detached from the shaft 3, another impeller 4' is secured to the latter, and an impeller housing 7 belonging to the new impeller is secured to the casing member 6. The strainer 10 and bottom plate 11 are mounted, and the exchange is completed, FIG. 3.

FIG. 4 illustrates the invention as applied to a pump provided with a two-stage impeller 4". The said impeller is divided radially between the stages in two portions, one upper portion 14 and one lower portion 15. The impeller housing 7" is divided likewise into two portions, one top portion 16 and one larger bottom portion 17. The latter is provided as usual with the strainer 10 and the bottom plate 11. The intermediate casing member 6 and

members

16 and 17 are joined by suitable bolts or the like (not illustrated). The bottom portion 17 of the impeller housing 7" is more or less similar to the impeller housing described above, and comprises inlet guide vanes 8 and outlet guide vanes 9". The upper impeller casing portion 16 is likewise provided with inlet guide vanes 18 and outlet guide vanes 19. Furthermore, the impeller casing portion 16 or -17 may be formed with an intermediate annular member 20 affording a circumferential extension of the lower impeller portion, and assisting in guiding the fluid fiow through the impeller.

Other embodiments and different modifications of details will be obvious to those skilled in the art, and will fall well within the scope of the invention such as expressed in the appended claims.

What I claim is:

1. An immersible drainage pump comprising an outer casing, an inner casing, a bladed pump impeller disposed within said outer casing and an electric drive motor disposed within said inner casing and connected to rotate said impeller, said inner and outer casings being arranged to provide a passage therebetween, said outer casing being formed of three components, a base member, an intermediate member forming also a closure for said inner casing, and a top member including a discharge opening, said components being joined together along planes perpendicular to the pump axis, said base member extending from the bottom of said outer casing and having its upper end approximately level with the bottom end of said inner casing, said base member forming an impeller casing joined to said intermediate casing member by means of bolt members, fluid inlet ports in said impeller casing and fluid flow guiding vanes both upstream and downstream of the impeller, said top outer casing member extending from said intermediate casing member and detachably secured to the latter by means of bolt members, said intermediate member being of comparatively short axial length and being secured to the bottom end portion of said inner casing by strut means integral with said intermediate member and with said inner casing, said strut means forming extensions in the flow direction of said guide vanes downstream of said impeller, said casing being formed with radially disposed rib members extending across the passage between said inner and said outer casing, and being provided along the whole length of said inner casing, said rib members being aligned with said strut means, and serving to further guide the fluid flow.

2. An immersible drainage pump as claimed in claim 1, wherein said rib members are hollow to allow air circulation therethrough to facilitate the cooling of the interior of said inner casing, and the electric drive motor disposed therein.

3. An immersible drainage pump as claimed in claim 2, wherein said base member forming the impeller casing is formed with a cylindrical perforated circumferential wall forming a strainer for the fluid to be pumped, and a bottom plate detachably secured to said base member and retaining said perforated wall in its desired position.

4. In an immersible drainage pump comprising an outer casing, an inner casing within said outer casing, a bladed pump impeller disposed within said outer casing and an electric drive motor disposed within said inner casing and connected to rotate said impeller, the walls of said casings being spaced to provide a passage therebetween, said outer casing being formed of three components, a base member, an intermediate member carrying a closure portion for said inner casing, and a top member, said components being joined together along planes perpendicular to the pump axis, said base member extending from the bottom of said outer casing and having its upperend substantially level with the bottom end of said inner casing, said base member forming an impeller casing and being joined to said intermediate casing member by means of bolt members, fluid inlet ports in said base member forming said impeller casing and fluid flow guide vanes both upstream and downstream of the impeller, said top outer casing member extending from said intermediate casing member and detachably secured to the latter by means of bolt members, said intermediate member being or comparatively little axial length and being secured to the portion thereof forming the closure of said inner casing by strut means integral with said intermediate member and said closure portion, said guide means comprising outlet guide vanes downstream ofsaid impeller, said strut means of said intermediate member forming extensions in the flow direction of said guide vanes, said inner casing being formed with radially disposed rib members extending across the passage between said inner and said outer casing extending essentially along the whole length of said inner casing, said rib means being aligned with said strut means and serving to further guide the fluid flow, said bladed impeller being a two-stage impeller divided along a plane between the stages, and said impeller casing being also divided into two portions, a lower main portion provided with inlet and outlet guide vanes, and an upper portion extending between the impeller stages, and provided with inlet and outlet guide means.

5. In animmersible drainage pump comprising an outer casing, an inner casing, a bladed pump impeller disposed within said outer casing and an electric drive motor disposed within said inner casing and connected.

to rotate said impeller, said outer casing being formed of three components, one base member, one intermediate member, and one top member, said components being joined together along planes perpendicular to the pump axis, said base member extending from the bottom of said outer casing and having its upper end adjacent the bottom end of said inner casing, said base member forming an impeller casing and being joined to said intermediate casing member by means of bolts, fluid inlet ports in said impeller casing and guide vanes upstream and down stream of the impeller, said top casing member extending from said intermediate casing member and detachably secured to the latter by means of bolts, said intermediate member being of comparatively little axial length and being secured to the bottom end portion of said inner casing by strut means integral with said intermediate member and said inner casing, said guide means comprising outlet guide vanes downstream of said impeller, and said strut means forming extensions in the flow direction of said guide vanes, said inner casing being formed with i radially disposed rib members extending across the passage between said inner and said outer casing, and being provided along substantially the whole length of said inner casing, said rib means being aligned with said strut means, and serving to further guide the fluid flow, said bladed impeller being a two-stage impeller divided along a plane between the stages, and said impeller casing being also divided into two portions, a lower main portion provided with inlet and outlet guide vanes, and an upper portion extending between the impeller stages provided with inlet and outlet guide means, and an annular member provided as a circumferential extension of that impeller stage closest to the pump inlet for assisting in guiding the pumping fluid through the impeller.

References Cited in the file of this patent UNITED STATES PATENTS 1,366,589 Ostenberg Jan. 25, 1921 1,387,660 Ostenberg Aug, 16, 1921 1,884,573 Chapman Oct. 25, 1932 1,974,183 Gunderson Sept. 18, 1934 2,130,583 Fosnot Sept. 20, 1938 2,423,436 Blom July 8, 1947 2,492,141 Gaylord Dec. 27, 1949 2,689,529 Wightrnan Sept. 21, 1954 2,921,532 Tsiguloff Jan. 19, 1960