US 5,078,573 A · Liquid ring pump having tapered blades and housing

Abstract

A liquid ring vacuum pump includes a vacuum pump housing composed by two opposed end walls spaced by an annular wall defining a vacuum pump chamber; a shaft extends into the vacuum pump chamber; a rotor is mounted on the shaft and is arranged eccentrically in the chamber; the rotor includes a rotor central portion and a plurality of vacuum pump vanes extending therefrom toward the annular wall; the rotor central portion and the vanes having at least one lateral edge adjacent the end walls facing the annular wall, the lateral edges and the end walls form a clearance therebetween; and the clearance between the edges and at least one of the adjacent end walls of the vacuum pump chamber increases towards the annular wall. A combination of the liquid ring vacuum pump with a centrifugal pump for pumping multi-phase liquids such as gas and solids containing fiber suspensions of the pulp and paper industry is also provided.

Claims15

Dependent claims

A liquid-ring vacuum pump comprising:

a vacuum pump housing comprising two opposed end walls (110, 112) spaced by an annular wall (110), said end walls and said annular wall defining a vacuum pump chamber (76);
a shaft (58) extending into said vacuum pump chamber (76);
a rotor (96) mounted on said shaft and being arranged eccentrically in said chamber;
said rotor comprising a rotor central portion (102) and a plurality of vacuum pump vanes (98) extending therefrom toward said annular wall (100);
said rotor central portion and having at least one lateral edge adjacent said end walls facing said annular wall (100), said lateral edges and said end walls forming a clearance (108) therebetween;
and said clearance (108) between said edges and at least one of said adjacent end wall of said vacuum pump chamber (76) increasing toward said annular wall.

3 more elements

A centrifugal pump comprising:

a centrifugal pump housing (50) having an inlet and an outlet for material to be pumped;
a centrifugal impeller mounted for rotation within said centrifugal pump housing;
a vacuum pump (70) adjacent said centrifugal pump housing;
an intermediate plate (72) separating said centrifugal pump housing from said vacuum pump;
said vacuum pump comprising:
a vacuum pump housing comprising two opposed end walls (110, 112) spaced by an annular wall (110), said end walls and said annular wall defining a vacuum pump chamber (76);
a shaft (58) extending into said vacuum pump chamber (76);
a rotor (96) mounted on said shaft and being arranged eccentrically in said chamber;
said rotor having a rotor central portion (102) and a plurality of vacuum pump vanes (98) extending therefrom toward said annular wall (100);
said rotor central portion and said vanes having at least one lateral edge adjacent said end walls and a tip facing said annular wall (100), said lateral edges and said end walls forming a clearance (108) therebetween;
and said clearance (108) between vane edges and at least one of said adjacent end wall of said vacuum pump chamber (76) being greater at said tip (99) thereof than in the vicinity of said rotor central portion (102).

8 more elements

Dependencies are inferred from the claim text.

Liquid ring pump having tapered blades and housing

Life of this patent

Liquid ring pump having tapered blades and housing

Life of this patent

Abstract

Claims15