Pump and impeller assembly for pumping liquids

Abstract

The invention relates to an impeller assembly and a pump for pumping liquids, the pump comprising a pump chamber and an impeller (4) arranged to rotate in said pump chamber, said impeller being suspended on an axially extending At the lower end (5) of the drive shaft unit (6), wherein said lower end (5) of the drive shaft unit (6) is received in the cylindrical recess (10) of the impeller (4), wherein the impeller ( 4) Can move back and forth in the axial direction relative to the drive shaft unit (6). The impeller also includes an axially extending hole (21) connecting the cylindrical recess (10) and the pump chamber, and the drive shaft unit (6) includes an axially extending pin (22) extending from the drive shaft unit ( 6) said lower end (5) protrudes, wherein said axially extending pin (22) is arranged in said axially extending hole (21).

Description

technical field [0001] The present invention relates generally to a pump for pumping liquids, and in particular to a pump for pumping contaminated liquids including solid matter, such as sewage, which may include polymers, sanitary Supplies, fabrics, rags, etc. [0002] According to a first aspect, the invention relates to a pump for pumping a liquid, said pump comprising a pump chamber and an impeller arranged to rotate in said pump chamber, said impeller being suspended on an axially extending drive shaft unit at the lower end of the drive shaft unit, wherein said lower end of the drive shaft unit is received in a cylindrical recess of the impeller, wherein the impeller is movable back and forth in the axial direction relative to the drive shaft unit, and wherein the impeller includes a connecting cylinder The axially extending hole of the shaped recess and the pump chamber. [0003] According to a second aspect, the invention relates to an impeller assembly arranged in a ...

AI Technical Summary

Problems solved by technology

However, the importance of reinstalling said plug before restarting the pump is sometimes overlooked when the pump is overhauled, for example due to readjustment of the axial clearance located between the impeller and impeller seat

After the pumped liquid enters the cylindrical recess of the impeller, the constituent parts are eventually eroded, which in turn adversely affects the axial movability between the impeller and the drive shaft or cannot be achieved at all. axial movement

Also, pieces of solid matter can enter into the cylindrical recess, which mechanically prevents the impeller from moving axially relative to the drive shaft

[0007] Furthermore, the interface between the impeller and the drive shaft unit has a relatively small extension (ie radial abutment between the drive shaft unit and the cylindrical recess), which makes the impeller once subjected to axially applied asymmetric the risk of tilting

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