Losses in a diffuser 26 for a radial discharge compressor including an impeller 10 with impeller blades 16 terminating in radially outer discharge ends 18 are minimized by means of first and second stages of diffuser vanes 30 and 32, which vanes 30 and 32 have cross sectional shapes configured as supercritical airfoils.

An internally threaded carrying member is engaged with a screw thread formed on an operating shaft and is in frictional engagement with a moving member. A first projection is formed at one end part of the operating shaft and a second projection is formed on the internally threaded carrying member so as to correspond to the first projection. Upon the arrival of the internally threaded carrying member at one end of its stroke on the operating shaft together with the moving member as the operating ...

A loudspeaker is provided in which a thin surround is employed for the speaker cone of impervious foam material, the surround being characterized by omni-directional elastic tension and being secured between the cone and the support.

A diffuser for centrifugal compressors includes a first plurality of passages therein, curved to receive expanding vortical flow from the impeller and having an inlet configuration to each of the first plurality of passages for accepting supersonic flow from a radial flow impeller and including a second plurality of passages located aft of throat regions in each of the first plurality of passages to produce an increased diffuser exit area in a subsonic flow region downstream of each of the throa...

A high inner pressure type multistage compression rotary compressor having a support member blocking an opening of a cylinder constituting the rotary compression element and having a bearing of a rotary shaft. The surface of the support member on a side opposite to the cylinder is depressed, and a rib is added to a part of this depressed portion. A discharge muffling chamber formed in the surface of the support member on the side opposite to the cylinder is divided into a plurality of discharge ...

An acoustical barrier usable for sound deadening and vibration dampening in vehicles which includes a base layer of a flexible foam secured at the outer surface to an insulation layer of polyurethane elastomer molded to the shape of the area to be insulated such as an automobile fire wall area. The inner surface of the base layer will preferably be in contact with the area to be insulated. The polyurethane elastomer of the insulation layer will preferably include a natural mineral filler impregn...

A soundproof structure for vehicle use includes a vehicle body forming panel, a lower side sound absorbing foamed resin layer on the panel, a rigid sound insulating panel on the foamed resin layer, and a press means between the vehicle body forming panel and the sound insulating panel to urge the sound insulating panel toward the former panel, the press means acting to hold the lower side foamed resin layer in compressed state, and an upper side sound absorbing layer being further laminated on t...

A loudspeaker system is provided wherein sound absorptive foam material is affixed to the sides of the loudspeaker cabinet so as to absorb that portion of the sound radiated from the loudspeaker that is directed towards the rear of the loudspeaker system, thereby serving in eliminating sound reflections from the walls of the room. This results in an overall system which can more accurately reproduce the recording site ambience inherent in a recording and which permits more accurate and natural i...

A diffuser for a centrifugal compressor has diffusing passages of circular or oval cross section which converge toward a throat and then diverge. The passages are of generally spiral curvature, at least in the converging portion. The entrances of the diffuser passages merge to define leading edges of generally elliptical shape between the passages.

The diffuser of a centrifugal compressor having an unshrouded rotor has boundary layer fences on the walls bounding the diffuser in advance of the diffuser vanes. These vanes are directed across the direction of flow of boundary layer air on the diffuser wall and curve into the direction of the diffuser vanes as they merge with the leading edge of the vanes.