Patent ID: 7837430
Filing Date: 2010-11-23
Classification: F04D

Abstract:
1. A rotary blower and aspirator machine having a modifiable conformation, comprising: an impeller, having a hub keyed on a shaft set in rotation by a motor of known type, and further provided with blades connected to a central body of the impeller; the impeller being closed in a casing which defines a circumferential annular conduit, in which the blades rotate, which annular conduit exhibits an intake mouth for aspirating fluid from outside the machine and a delivery mouth for enabling outlet of fluid from the machine; in which the annular conduit exhibits a first tract which, in an advancement direction of the blades in the conduit, goes from the intake mouth to the delivery mouth, and a second tract which goes from the delivery mouth to the intake mouth; in which a free space is provided in the first tract between the rotating blades and the internal walls of the annular conduit, while in the second tract each blade skims the internal walls of the second tract; in which internally of the first tract the blades of the impeller rotate in such a way as to create a turbulence which enables transport of the fluid from the intake mouth to the delivery mouth; wherein the machine includes interchangeable elements which are applicable to parts of the machine affording the free space, which when applied define a new conformation of a radial section of the free space; wherein the interchangeable elements comprise at least a pair of inserts which are each connectable to one of the internal walls of the casing at the first tract of the annular conduit, which at least a pair of inserts is conformed in such a way as to define a new internal wall of the first tract, which reduces the radial section of the free space with respect to a radial section thereof defined by the internal wall of the casing; wherein the at least a pair of inserts develop along an entire length of the internal walls of the casing at the first tract of the annular conduit and are connected to the internal walls of the casing in order to be displaceable in an axial direction with respect to the casing; and wherein the at least a pair of inserts are made of an elastically deformable material and are connected to the internal walls of the casing in such a way as to leave a free space between the internal walls of the casing and the at least a pair of inserts; means of known type being provided for introducing a dilating fluid into or extracting a dilating fluid from the free space.