Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
  • F04D29/4226—Fan casings
  • F04D29/4246—Fan casings comprising more than one outlet
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/40—Casings; Connections of working fluid
  • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
  • F04D29/44—Fluid-guiding means, e.g. diffusers
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F7/00—Ventilation
  • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
  • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
  • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems

Definitions

• This invention relates to a ventilation unit and in particular a ventilation unit comprising a centrifugal fan, more specifically a radial fan, which is housed in a corresponding diffuser.
• Radial fans are fans of a substantially known type which, when driven to rotate suck air from an intake which is coaxial with the axis of rotation and generate an air flow which is spread radially from the fan itself.
• Such fans are usually inserted, together with a respective motor, in diffusers which are suitably shaped for directing and optimising the air flow generated by the fan.
• fans described above are used in the automotive sector, for example in cars, lorries, agricultural machinery, earth moving machinery, buses and the like, for carrying heat away from heat exchangers, for moving air in driver and passenger compartments or, in general, for cooling components or parts which are subject to temperature increases during operation.
• the main aim of this invention is to overcome the above- mentioned disadvantages
• One aim of this invention is to provide a ventilation unit, intended in particular for cooling batteries, which is more efficient than the prior art solutions.
• a further aim is to provide a ventilation unit which has lower noise emissions than the prior art solutions.
• FIG. 1 is a partly exploded schematic perspective view of a ventilation unit according to this invention
• FIG. 2 is a schematic side view of the ventilation unit of Figure 1 ;
• FIG. 3 is a cross-section of the ventilation unit according to line III - III of Figure 2;
• FIG. 4 illustrates a fluid dynamic simulation of operation of a ventilation unit according to this invention
• FIG. 5 illustrates a second fluid dynamic simulation of operation of a ventilation unit according to this invention.
• the numeral 1 denotes a ventilation unit according to this invention, which is intended to generate a cooling air flow F.
• the ventilation unit 1 comprises a centrifugal rotor 2, in particular radial, having an external diameter D and able to rotate about an axis R of rotation, means for operating the rotor 2, of the substantially known type and schematically illustrated with a block 3, and a diffuser 4 for supporting the rotor 2.
• the rotor 2 only described as regards those parts necessary for an understanding of this invention, comprises a hub 2a and a plurality of vanes 2b, with tips 2c, which are connected to the hub 2a.
• the diffuser 4 extends according to a plane P which is perpendicular to the axis R of rotation and delimits a blowing duct 5 in which the rotor 2 is inserted.
• the diffuser comprises an inlet 20 and a first and a second outlet 6, 7 for the air flow F.
• the first and second outlets 6, 7 are positioned on opposite sides of the rotor 2.
• the first and second outlets 6, 7 are positioned on opposite sides of the inlet 20 of the diffuser 4.
• the centrifugal rotor 2, the first outlet 6 and the second outlet 7 are aligned with each other according to a main axis X which is perpendicular to the axis R of rotation.
• the inlet 20 of the diffuser 4 corresponds, preferably, to an inlet of the rotor 2.
• the inlet 20 of the diffuser 4 extends in a plane transversal to, preferably perpendicular to, the axis R of rotation.
• the axis X also defines a blowing direction of the ventilation unit 1 which, in the example illustrated, corresponds to the main direction of extension of the diffuser 4.
• the axis R of rotation defines a preferred flow direction of the air entering the rotor 2 and the diffuser 4.
• the air flow F exits the duct 5 along the blowing line in a direction V1 from the outlet 6 and exits in a direction V2, opposite to V1 , from the outlet 7.
• the diffuser 4 and the rotor 2 are assembled and configured relative to each other in such a way that the flow generated by the rotor 2 is distributed in the directions V1 and V2 of the blowing line parallel with the main axis X.
• the diffuser 4 advantageously has a structure with central symmetry, the centre being at the axis R of rotation.
• the axis R itself defines at the intersection with the above-mentioned section the centre of symmetry of the section considered.
• the diffuser 4 has the shape of a parallelepiped, in particular a right-angled parallelepiped, comprising an upper face 8, a lower face 9, a first and a second side face 10, 11 while the outlets 6, 7 define the remaining two faces of the diffuser 4.
• the first and second outlets 6, 7 respectively delimit a first and a second outfeed section 6a, 7a for the flow F.
• the inlet 20 of the diffuser 4 is provided on the face 8.
• the first and second outfeed sections 6a, 7a are transversal to the axis X and in particular are perpendicular to it.
• the first and second outlets 6, 7 are positioned at the same height, measured along the axis R of rotation.
• outlets 6, 7 are identical and are positioned symmetrically relative to the rotor 2.
• the rotor 2 in more detail, it may be seen how advantageously the height of the rotor, measured along the axis R, is comparable with the height of the duct 5, measured along the axis R.
• the diffuser 4 comprises means for guiding the above-mentioned air flow F inside the duct 5.
• the flow guide means are positioned in the diffuser between the rotor 2 and the first outlet 6 and between the rotor 2 and the second outlet 7, for guiding the flow F inside the duct 5.
• the guide means comprise a first flow diverter 12, positioned in the blowing duct 5 between the rotor 2 and the first outlet 6, which delimits a narrowing 13 in the duct 5.
• the guide means also comprise a second flow diverter 14, positioned in the blowing duct 5 between the rotor 2 and the second outlet 7, which delimits a second narrowing 15 in the duct 5.
• the first flow diverter 12 and the corresponding narrowing 13 and the second flow diverter 12 with the corresponding narrowing 14 are positioned on opposite sides of the rotor 2 along the axis X.
• the first flow diverter 12 and the corresponding narrowing 13 and the second flow diverter 14 with the corresponding narrowing 15 are positioned on opposite sides of the rotor 2 along a transversal axis Y which is perpendicular to the blowing line and to the axis R of rotation.
• the axis R of rotation, the main axis X and the transversal axis Y define a set of three axes which are at right angles to each other.
• the diffuser 4 has a structure with central symmetry, the centre being at the axis R of rotation.
• the axis R itself defines at the intersection with the above-mentioned section the centre of symmetry of the section considered.
• the first flow diverter 12 and the second flow diverter 14 are positioned in the duct 5 in such a way that, in practice, given a vane 2b the tip 2c of the vane encounters, during air flow F generation, first the first flow diverter 12 followed by the second narrowing 15, then the second flow diverter 14 and finally, before encountering the first flow diverter 12 again, it encounters the first narrowing 13.
• the flow F is optimised in terms of noise and efficiency.
• the first and second side faces 10, 1 1 of the diffuser 4, that is to say, the walls which define them, are shaped in such a way as to create, inside the duct 5, the flow diverters 12 and 14 which project towards the inside of the duct 5.
• the faces 10, 1 1 are flat and the flow diverters 12, 14 project from them towards the inside of the duct 5.
• the diffuser 4 maintains a central symmetry, the centre being at the axis R of rotation.
• the first and second flow diverters 12, 14 have a similar shape and profile and each comprises a respective first face 12a, 14a which is curved, with the concavity facing towards the rotor 2.
• first face 12a, 14a is formed by a portion of a cylindrical surface whose main axis coincides with the axis R of rotation.
• the faces 12a, 14a which are defined by a portion of cylindrical surface, convey the flow exiting the rotor 2 towards the outlets 7 and 6, following its natural rotational pattern.
• the diffuser 4 is particularly efficient in conveying the flow F exiting the rotor 2 towards the outlets 7 and 6.
• the faces 12a, 14a extend towards the outlet 7 and the outlet 6, respectively, with a stretch or profile 12d, 14d.
• the stretches 12d and 14d are each preferably defined by a flat surface lying in the plane defined by the axes R and X.
• the first and second flow diverters 12, 14 each have a respective second face 12b, 14b which is curved, with the concavity respectively facing towards the first outlet 6 and towards the second outlet 7.
• the first and second flow diverters 12, 14 each have a cusp, that is to say, a rounded point, 12c, 14c, connecting the first face 12a, 14a and the second face 12b, 14b.
• the guide means 12, 14 allow the recovery of dissipated energy which would otherwise be lost in the generation of vortices.
• Figure 5 shows how the recirculations are absent in the embodiment of the ventilation unit 1 comprising the flow diverters 12, 14, under the same operating conditions.
• the presence of the flow diverters 12, 14 causes an increase in performance, even compared with the first embodiment illustrated in Figure 4, without compromising the output flow rate from the ventilation unit 1.
• the flow F remains divided in a balanced way in terms of flow rate between the two outlets 6, 7.
• elimination of the recirculations 16 contributes to a reduction in the overall noise of the ventilation unit 1.
• the central symmetry of the ventilation unit 1 allows the flow F to be rendered uniform in all portions of the diffuser 4.
• the positioning of the flow diverters 12, 14 in the duct 5 is determined depending on the dimensions of the rotor 2 and the speed of rotation of the rotor.
• the position "I" according to the axis X of the flow diverters 12, 14 depends on the flow rate and the speed of rotation of the rotor 2, like the height "h” of the flow diverters relative to the corresponding wall of the diffuser.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Dry Shavers And Clippers (AREA)
• Diaphragms For Electromechanical Transducers (AREA)
• Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
• Centrifugal Separators (AREA)
• Compressor (AREA)
• Catching Or Destruction (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

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Families Citing this family (4)

Family Cites Families (13)

• 2012
  • 2012-05-31 IT IT000298A patent/ITBO20120298A1/it unknown
• 2013
  • 2013-05-30 EP EP13737415.3A patent/EP2855942A2/en not_active Withdrawn
  • 2013-05-30 US US14/403,807 patent/US20150147167A1/en not_active Abandoned
  • 2013-05-30 BR BR112014029620A patent/BR112014029620A2/pt not_active IP Right Cessation
  • 2013-05-30 CN CN201380028731.0A patent/CN104379940A/zh active Pending
  • 2013-05-30 RU RU2014153361A patent/RU2624158C2/ru not_active IP Right Cessation
  • 2013-05-30 WO PCT/IB2013/054473 patent/WO2013179256A2/en active Application Filing
  • 2013-05-30 KR KR1020147037049A patent/KR20150015540A/ko not_active Application Discontinuation
  • 2013-05-30 JP JP2015514664A patent/JP6258927B2/ja not_active Expired - Fee Related
• 2014
  • 2014-11-14 IN IN2602KON2014 patent/IN2014KN02602A/en unknown

Non-Patent Citations (1)

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