Rotary blower and aspirator having a modifiable conformation

Abstract

The machine comprises an impeller, provided with blades connected to a central body of the impeller; the impeller is closed in a casing which defines an annular conduit, in which the blades rotate, which annular conduit exhibits an intake mouth and a delivery mouth and further exhibits a first tract which goes from the intake mouth to the delivery mouth, a free space is provided in the first tract between the rotating blades and the internal walls of the annular conduit. The conformation of the radial section of the annular conduit can be modified by application of interchangeable elements to parts of the machine which define the free space.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Further characteristics and advantages of the present invention will better emerge from the detailed description that follows of two preferred embodiments of the invention, illustrated by way of non-limiting examples in the figures of the drawings, in which:

FIG. 1 is a perspective view, with some parts sectioned, of a machine of the invention;

FIG. 2 is a front view of a vertical elevation of a machine of the invention from which the front cover of the casing has been removed;

FIGS. 3, 4, 5 are sections made according to line III-III of FIG. 2, of the machine with some inter-changeable elements inserted;

FIG. 6 is an embodiment of a series of interchangeable blades;

FIG. 7 is a schematic view of some flow-rate/head diagrams which can be obtained with the machine of the invention.

Claims

1). A rotary blower and aspirator 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.

2). The machine of claim 1, 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.

3). The machine of claim 2, 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, reproducing a conformation of the internal walls without leaving free spaces between the internal wall of the casing and the at least a pair of inserts.

4). The machine of claim 3, wherein the at least a pair of inserts are made by moulding of a plastic material.

5). The machine of claim 2, 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.

6). The machine of claim 5, 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 or extracting a dilating fluid from internally of the free space.

7). The machine of claim 1, wherein: the interchangeable elements comprise a plurality of series of blades, each series of the plurality of series having blades of a different size from the blades of the other series of the plurality; the blades of the plurality of series being removably connectable to the impeller; a section of the second tract of the conduit being defined by a plurality of series of removable walls; each of the plurality of series of removable walls being able to combine with a series of the plurality of series of blades in order to define, for each series of blades of the plurality, a section of the second tract which enables the blades of the series of blades to skim the internal walls of the second tract.

8). The machine of claim 7, wherein each series of blades comprises a flexible belt, on which blades of each series of blades are solidly constrained; the flexible belt being removably connected to the external circumference of the central body of the impeller.

9). The machine of claim 8, wherein the flexible belt is made by moulding a plastic material in a single piece with the blade.

10). The machine of claim 1, wherein the motor powering the shaft in rotation is an electric motor supplied by an inverter of known type.