A blower assembly including a motor, an impeller and a volute that is configured such that an inlet chamber of the volute and an outlet chamber of the volute are divided from one another by an airtight membrane and the membrane is configured to allow the transmission of pressure waves between the inlet and outlet chambers.

A blower assembly including a motor, an impeller and a volute that is configured such that an inlet chamber of the volute and an outlet chamber of the volute are divided from one another by an airtight membrane and the membrane is configured to allow the transmission of pressure waves between the inlet and outlet chambers.

A vacuum pump comprises a cylindrical rotor; a cylindrical stator which discharges gas in cooperation with the rotor; and a tubular base to which the stator is fixed. The stator has no fitting structure with respect to the base and is fixed to the base in a concentric state. A pin hole is formed on the stator and the base respectively, and a positioning pin for achieving the concentric state is inserted into each pin hole.

A method of assembling and retaining a noise attenuation device (30) within an air inlet (16) of a compressor cover (12) includes inserting the noise attenuation device (30) into the air inlet (16) and applying a rolling compressive force to the air inlet (16) using a forming tool (40). As a result, the air inlet terminal end (17) is deformed radially inward so as to form a radially-inwardly protruding lip (17b) about the air inlet terminal end (17). The radially-inwardly protruding lip (17b) is configured to retain the noise attenuation device (30) within the air inlet (16). The forming tool (40) used to form the radially-inwardly protruding lip (17b) is also described.

The present invention provides a method for producing a casing for a compressor, the method including an intake-side casing molding process of molding an intake portion and a first main body portion of a scroll portion by integral molding of resin; an impeller-side casing molding process of integrally molding a second main body portion of the scroll portion and a diffuser portion by a resin molding metal mold used in the intake-side casing molding process; a die sliding process of combining the intake portion and the first main body portion which have been integrally molded, and the second main body portion and the diffuser portion which have been integrally molded, by slide of the resin molding metal mold; and a secondary molding process of joining the intake portion and the first main body portion, and the second main body portion and the diffuser portion combined with each other by resin.

A coupling pin for use in a pump housing, the pump housing including an outer casing and an inner pump liner, the coupling pin being suitable for locating the liner and casing relative to one another, the coupling pin including a shank and a head at one end of the shank. The head includes a cammed surface thereon which is adapted to co-operate with a follower on the liner, and a locating section on a remote or terminal end of the head which is adapted to be positioned against a seat in the outer casing when fitted. The arrangement is such that rotation of the coupling pin causes the follower to track along the cammed surface so as to cause relative movement between the outer casing and the inner pump liner.

An impeller rotator (21) includes a turbine impeller (11), a compressor impeller (12), a shaft (13) connecting the turbine impeller (11) to the compressor impeller (12), and a connecting member (16) fastening one of the turbine impeller and the compressor impeller to one axial end region of the shaft, and the connecting member (16) is plastic-deformed so as to decrease overall imbalance of the turbine impeller (11), the compressor impeller (12), and the shaft (13).

A turbocharger turbine having a blade-gap zone between the blades and the shroud wall. The blade-gap zone is larger at and near the exducer than at an upstream location where the shroud wall is at its minimum radius. Also disclosed is a method of customizing and manufacturing a turbine by establishing an optimized blade-gap zone at the exducer, and machining it into a turbine housing.

A turbocharger turbine having a blade-gap zone between the blades and the shroud wall. The blade-gap zone is larger at and near the exducer than at an upstream location where the shroud wall is at its minimum radius. Also disclosed is a method of customizing and manufacturing a turbine by establishing an optimized blade-gap zone at the exducer, and machining it into a turbine housing.

A seal for use in a centrifugal pump, the pump having a stationary pump casing, a stationary plate and an axially adjustable side liner, is disclosed. The seal includes a base having an inner surface and an outer surface. A band portion extends from the base and a retainer member extends from the band portion. The retainer member is spaced apart from the base and oriented for positioning against a groove formed in the axially adjustable side plate liner of the centrifugal pump.