Alfa Laval Flow Inc.

Kenneth Smith

Thomas Fuggle

Ian Hill

An improved rotary lobe pump has a pumping chamber (1) having a housing (2) closed by a front wall (3)and a rear wall (6). The front housing wall (3) is secured to the housing (2) by bolts (4) and is sealed with a gasket (5). The housing (2) comprises a rear housing wall (6) running parallel with the front housing wall (3). The rear housing wall (6) includes an orifice designed in the form of a sealing hub (7) through which a drive shaft (7) enters the pumping chamber (1). A rotor in the form of a rotary lobe piston (10) can be slidably placed on that end (9) of the drive shaft (8) which projects into the pumping chamber (1). Provided on the rotary lobe piston (10) and integral therewith is an axial extension in the form of a sleeve (13) which surrounds the drive shaft (8) and passes through the sealed hub (7) the seal (20) surrounding the hub (7) is thus in contact with the sleeve (13). The sleeve (13) comprises a bead-shaped edge (13a) by which it pushes against a stop (14) surrounding the drive shaft (8) in an annular configuration. This stop limits the axial displacement of the rotary drive piston (10) in the direction of the rear housing wall (6).

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Camden Hill, United Kingdom

Kenneth Smith