Multistage roots pump and a method of assembling such a pump

Details Multistage roots pump and a method of assembling such a pump Multistage roots pump and a method of assembling such a pump

1989-11-07

1991-05-07

Vrablik, John J.

Rotary expansible chamber devices

Interengaging rotating members

Like rotary members

2988802, 29888023, 403370, 403374, F04C 212, F04C 1812

Patent

active

050132270

ABSTRACT:
The pump comprises a stator constituted by an alternating sucession of stator plates (22) and stator rings (21) defining a sequence of compression chambers (20), and a rotor assembly comprising two shafts (24, 25) each having a compression lobe (28) in each of the compression chambers (20), with the compression lobes being placed on and fixed to their shafts during assembly of the pump, thereby enabling the axial clearance between each lobe and the adjacent stator plate to be individually adjusted, with each lobe being constituted by a body (29) and a clamping plate (30) which is fixed to the body by screws (34) which compress a set of two conical rings (32, 33), one of which (33) penetrates into the other while being compressed radially, thereby fixing the lobe in place. The assembly melthod consists in using a assembly plate (23) having a portion of extra thickness j penetrating into the stator ring over a distance corresponding to the desired clearance between the lobes and the stator plate (22). The lobes are positioned angularly by means of rods (45) and they are positioned axially by thrusting them against the assembly plate (23) by means of assembly screws (48). Once this has been done, the lobes are fixed to their shafts by tightening the clamping screws (34) which compress the conical rings (32, 33) causing them to clamp against the shaft.

REFERENCES:
patent: 4425816 (1984-01-01), Toyoda
patent: 4504201 (1985-03-01), Wycliffe
patent: 4789314 (1988-12-01), Higuchi et al.

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