The invention relates to a pneumatic vacuum in which an ejector (10) exhibits a tubular conduit (11) for injection of compressed air, a discharge channel (12) for discharging the aspirated fluid and the compressed air injected via the tubular conduit (11), an aspirating channel (13) in fluid communi
The invention relates to a pneumatic vacuum in which an ejector (10) exhibits a tubular conduit (11) for injection of compressed air, a discharge channel (12) for discharging the aspirated fluid and the compressed air injected via the tubular conduit (11), an aspirating channel (13) in fluid communication with the tubular conduit (11) and the discharge channel (12) for aspirating; the ejector (10) has a first and a second tubular body (17, 24) exhibiting a first converging portion (20, 25) arranged downstream of an inlet zone (18) along an aspirating direction (21) and a second portion (22, 26) having a constant section emerging from the first converging portion (20, 25) at the smaller-section zone (23, 27) and downstream of the first portion (20, 25) along the aspirating direction (21), the tubular conduit (11) for injecting the compressed air exhibiting an inlet mouth (28) located at the converging portion (25) of the second tubular body (24) such as to inject pressurized air into the second tubular body (24).
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1. A pneumatic vacuum cleaner comprising: an ejector for generating a depression suitable for enabling aspiration of at least a fluid from an aspirating zone, the ejector comprising at least a tubular conduit for injecting compressed air;at least a discharge channel for discharging the aspirated flu
1. A pneumatic vacuum cleaner comprising: an ejector for generating a depression suitable for enabling aspiration of at least a fluid from an aspirating zone, the ejector comprising at least a tubular conduit for injecting compressed air;at least a discharge channel for discharging the aspirated fluid and the compressed air injected via the tubular conduit; andat least an aspirating channel in fluid communication with the tubular conduit and the discharge channel in order to aspirate the fluid from a chamber, the aspirating channel comprising a distal terminal end and a flexible tube having the distal terminal end for enabling the distal terminal end to assume a plurality of different relative positions with respect to the ejector, the ejector comprising: a first tubular body, exhibiting: an inlet zone in fluid communication with the aspirating channel and an outlet zone in fluid communication with the discharge channel;a first converging portion located downstream of the inlet zone along an aspirating direction, the outlet zone being positioned downstream of the first converging portion along the aspirating direction, the first converging portion of the first tubular body comprises a first tract and a second tract successively arranged along the aspirating direction, the first and the second tract exhibiting differentiated convergences, an angle of conicity defined between the first tract and a longitudinal axis of the first tubular body being greater than the corresponding angle of conicity defined between the second tract and the longitudinal axis of the first tubular body, said corresponding angle of conicity defined between the second tract and the longitudinal axis of the first tubular body being less than 9 degrees, anda second tubular body associated at least partly internally of the first tubular body and exhibiting a second converging portion, the tubular conduit for the injection of compressed air exhibiting an outlet mouth at the second converging portion of the second tubular body for injecting pressurised air into the second tubular body, the outlet mouth having a smaller section than an inlet section of the second converging portion such as to define an additional area of fluid inlet into the second converging portion, the inlet section of the second converging portion of the second tubular body being smaller than the inlet section of the first converging portion of the first tubular body such as to define a second additional area for inlet of a fluid into the first converging portion of the first tubular body,wherein an angle of conicity defined between the second converging portion of the second tubular body and a longitudinal axis of the second tubular body is greater than the corresponding angle of conicity defined between the second tract and the longitudinal axis of the first tubular body and is comprised between 27° and 40°, the angle of conicity defined between the second converging portion of the second tubular body and the longitudinal axis of the second tubular body is greater than the corresponding angle of conicity defined between the first tract and the longitudinal axis of the first tubular body. 2. The pneumatic vacuum cleaner of claim 1, wherein the first tubular body exhibits a second portion having a substantially constant diameter and emerging from the first converging portion at the smallest-section zone and downstream of the first converging portion along the aspirating direction, the outlet zone being positioned downstream of the second portion along the aspirating direction. 3. The pneumatic vacuum cleaner of claim 1, wherein the second tubular body associated to the first tubular body exhibits a second portion having a substantially constant diameter emerging from the second converging portion at the smallest-section zone, the second tubular body being positioned internally of the first tubular body substantially at the first converging portion of the first tubular body. 4. The pneumatic vacuum cleaner of claim 3, wherein the second portion of the second tubular body exhibits an outlet mouth located upstream of the smallest-section zone of the first converging portion along the aspirating direction. 5. The pneumatic vacuum cleaner of claim 3, wherein the second portion of the second tubular body exhibits an outlet mouth aligned with the intersection of the first and second tracts of the first converging portion along the aspirating direction. 6. The pneumatic vacuum cleaner of claim 1, wherein the flexible tube exhibits a free length which is sufficient for enabling use of the aspirating device by a user without any need for correspondingly moving the ejector. 7. The pneumatic vacuum cleaner of claim 1, wherein the flexible tube exhibits a free internal aspirating diameter comprised between 18 and 52 mm. 8. The pneumatic vacuum cleaner of claim 1, further comprising a device for surface abrasion of a structure, the device comprising: a support body exhibiting a coupling surface and at least an aspirating channel or an aspirating chamber in fluid communication with the outside via one or more openings present on the coupling surface and provided with at least an additional aspirating opening;an abrading body, made of a laminar material, exhibiting a work surface configured, in use conditions, to be facing towards the structure to be abraded and provided with an abrasive material and an opposite surface to the working surface and constrained to the coupling surface of the support body, the abrasive body enabling aspiration of the abraded particles in a presence of a depression in the aspirating chamber or in the aspirating channel. 9. The pneumatic vacuum cleaner of claim 8, wherein the abrading device comprises at least a profiled gripping portion for manual movement thereof, no ejector being present and mounted on the abrading device. 10. The pneumatic vacuum cleaner of claim 1, further comprising an injection channel of compressed air connected to the tubular conduit and a pressure regulator mounted on a support frame and acting on the injection channel to vary the pressure of the compressed air, the pressure regulator being configured to enable an injection of compressed air at a known pressure value or a preset value selectable from among a plurality of allowed values. 11. The pneumatic vacuum cleaner of claim 10, wherein the pressure regulator comprises a pressure indicator configured to display a pressure value of the air in inlet via the tubular conduit and/or comprises a plurality of discrete pre-selectable positions for injecting compressed air at predefined values. 12. The pneumatic vacuum cleaner of claim 1, comprising: at least a collecting container of aspirated particulate, the collecting container being configured to internally retain the solid aspirated particles and to discharge the volumes of aspirated air to the outside;a support frame, the collecting container being engaged to the support frame, the support frame bearing also the ejector. 13. The pneumatic vacuum cleaner of claim 1, wherein a ratio between an overall length of the first tubular body and an overall length of the second tubular body is greater than 2 and less than 3.5. 14. The pneumatic vacuum cleaner of claim 1, wherein a ratio between the free area of passage defined by the additional area and a free area of passage for the compressed air defined by the outlet mouth is comprised between 15 and 30. 15. The pneumatic vacuum cleaner of claim 1, wherein a ratio between the second additional area and the free area of passage for the compressed air defined by the outlet mouth is comprised between 5 and 15. 16. A pneumatic vacuum cleaner comprising: an ejector for generating a depression suitable for enabling aspiration of at least a fluid from an aspirating zone, the ejector comprising at least a tubular conduit for injecting compressed air;at least a discharge channel for discharging the aspirated fluid and the compressed air injected via the tubular conduit; andat least an aspirating channel in fluid communication with the tubular conduit and the discharge channel in order to aspirate the fluid from a chamber, the aspirating channel comprising a distal terminal end and a flexible tube having the distal terminal end for enabling the distal terminal end to assume a plurality of different relative positions with respect to the ejector, the ejector comprising: a first tubular body, exhibiting: an inlet zone in fluid communication with the aspirating channel and an outlet zone in fluid communication with the discharge channel;a first converging portion located downstream of the inlet zone along an aspirating direction, the outlet zone being positioned downstream of the first converging portion along the aspirating direction, the first converging portion of the first tubular body comprises a first tract and a second tract successively arranged along the aspirating direction, the second tract being longer than the first tract along the aspirating direction, an angle of conicity defined between the first tract and a longitudinal axis of the first tubular body being greater than the corresponding angle of conicity defined between the second tract and the longitudinal axis of the first tubular body; anda second portion having a substantially constant diameter and emerging from the first converging portion at the smallest-section zone and downstream of the first converging portion along the aspirating direction, the outlet zone being positioned downstream of the second portion along the aspirating direction;a second tubular body positioned internally of the first tubular body substantially at the first converging portion of the first tubular body and exhibiting: a second converging portion, the tubular body for the injection of compressed air exhibiting an outlet mouth at the second converging portion of the second tubular body for injecting pressurised air into the second tubular body, the outlet mouth having a smaller section than an inlet section of the second converging portion such as to define an additional area of fluid inlet into the second converging portion, the inlet section of the second converging portion of the second tubular body being smaller than the inlet section of the first converging portion of the first tubular body such as to define a second additional area for inlet of a fluid into the first converging portion of the first tubular body,a second portion having a substantially constant diameter emerging from the second converging portion at the smallest-section zone, the second portion of the second tubular body exhibiting an outlet mouth aligned with the intersection of the first and second tracts of the first converging portion along the aspirating direction,wherein an angle of conicity defined between the second converging portion of the second tubular body and a longitudinal axis of the second tubular body is greater than the corresponding angle of conicity defined between the second tract and the longitudinal axis of the first tubular body, the angle of conicity defined between the second converging portion of the second tubular body and the longitudinal axis of the second tubular body is greater than the corresponding angle of conicity defined between the first tract and the longitudinal axis of the first tubular body. 17. A pneumatic vacuum cleaner according to claim 16, wherein a length of the first tract of the first converging portion along the longitudinal axis is three times a length of the second portion of the first tubular body and a length of the second tract of the first converging portion along the longitudinal axis is 4.5 times the length of the second portion of the first tubular body. 18. The pneumatic vacuum cleaner of claim 16, wherein an angle of conicity of the first converging portion of the second tubular body is comprised between 20° and 40°.
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