EP3211242A1 - Souffleur centrifuge électrique avec des dimensions géométriques particulières - Google Patents

Souffleur centrifuge électrique avec des dimensions géométriques particulières Download PDF

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Publication number
EP3211242A1
EP3211242A1 EP17155566.7A EP17155566A EP3211242A1 EP 3211242 A1 EP3211242 A1 EP 3211242A1 EP 17155566 A EP17155566 A EP 17155566A EP 3211242 A1 EP3211242 A1 EP 3211242A1
Authority
EP
European Patent Office
Prior art keywords
rotor
center
deflector
radius
circular arc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17155566.7A
Other languages
German (de)
English (en)
Inventor
Gabriele Sampaolesi
Riccardo Massili
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EMC Electric Motors Co Srl
Original Assignee
EMC Electric Motors Co Srl
E M C Electric Motors Co Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EMC Electric Motors Co Srl, E M C Electric Motors Co Srl filed Critical EMC Electric Motors Co Srl
Publication of EP3211242A1 publication Critical patent/EP3211242A1/fr
Withdrawn legal-status Critical Current

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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
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/424—Double entry casings
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
    • 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
    • F04D29/422—Discharge tongues

Definitions

  • the present patent application relates to a centrifugal electrical fan capable of optimizing an air extraction process and therefore especially suitable for being used in extractor hoods.
  • extractor hoods generally use centrifugal electrical fans.
  • a centrifugal electrical fan of the prior art is shown, which is generally indicated with reference numeral 100.
  • the electrical fan (100) comprises a body (2).
  • a rotor (3) is revolvingly mounted inside the body (2) and is driven into rotation by an electrical motor (4) in such a way that the rotor (3) rotates around an axis of rotation (Z).
  • Two inlet mouths (20, 21) are obtained in the casing (2) in opposite position.
  • the air enters the inlet mouths (20, 21) in opposite directions, i.e. in the direction of the arrows (I1, I2) along the direction of the axis of rotation (Z) of the rotor.
  • the inlet mouths (20, 21) are generally covered with grills.
  • an outlet mouth (22) is obtained, generally having a circular shape, which defines an opening from which air is emitted in the direction of the arrow (U), along an outlet direction (A) orthogonal to the axis of rotation (Z) of the rotor and orthogonal to a flat surface defined by the outlet mouth.
  • the rotor (3) comprises a plurality of blades that are configured in a way to axially extract air axially along the axis of rotation (Z) of the rotor and send air radially towards the exterior of the rotor, by centrifugal action, in a way that the air hits the internal surface of the casing (2) and is conveyed towards the outlet mouth (22).
  • the use of a deflector (5) is known, it being disposed in the outlet mouth (22) in a way to cover approximately half of the opening defined by the outlet mouth (22).
  • the deflector (5) is an extension of the casing (2) and the deflector (5) has an edge (50) that basically extends in correspondence of a diameter of the outlet mouth (22).
  • the casing (2) as well as the deflector (5) are shaped as an auger; in other words, the profile of the internal surface of the casing (2) and of the internal surface of the deflector (5) is shaped as a spiral.
  • a peripheral channel (6) is formed between a circumference passing through the peripheral ends of the rotor (3) and the spiral-shaped internal surface of the casing (2) and of the deflector (5).
  • the peripheral channel (6) has a gradually increasing width going from the edge (50) of the deflector to an ending part (24) of the casing in proximal position to the outlet mouth (22).
  • the deflector (5) is used to increase the speed of the rotor in such a way to increase the extraction capacity of the entire fan (100). In fact, the higher is the speed of the rotor, the higher the amount of extracted air will be.
  • the load torque on the driving shaft of the motor (4) is decreased.
  • the motor (4) is an asynchronous motor, upon decreasing the load torque on the driving shaft, the rotational speed of the driving shaft increases.
  • the increase in the speed of the rotor (3) caused by the presence of the deflector (5) does not automatically improve the aerodynamic extraction process in a significant way, without a correct positioning and dimensioning of the deflector (5).
  • said deflector would obstruct the air flow coming out from the outlet mouth (22), without causing any significant improvement, on the contrary worsening the fluid-dynamic efficiency.
  • DE1050015 discloses a centrifugal electrical fan comprising a casing and a rotor revolvingly mounted in the casing in such a way to rotate around an axis of rotation.
  • Such an electrical fan comprises an inlet mouth obtained in the casing to let air flows enter the casing along the direction of the axis of rotation of the rotor, and an outlet mouth obtained in the casing to let an air flow exit along an outlet direction orthogonal to the axis of rotation of the rotor.
  • a deflector is mounted in the outlet mouth of the casing.
  • the purpose of the present invention is to eliminate the drawbacks of the prior art by devising an electrical fan with a high fluid dynamic efficiency (FDE).
  • FDE fluid dynamic efficiency
  • Another purpose is to provide an electrical fan with small dimensions and volume that can be easily adapted to the limited space that is available in a special type of hoods known as "pull out” and/or “free-standing” hoods.
  • centrifugal electrical fan according to the invention is applied to extractor hoods, in particular to the extractor hoods known as "pull-out” and/or “free-standing” extractor hoods.
  • the electrical fan (1) according to the invention comprises:
  • the outlet mouth (22) has a circular shape with a diameter ( ⁇ ) comprised between 105 and 125 mm, preferably 116 mm.
  • the outlet direction (A) is considered as the axis of the outlet mouth, i.e. the straight line orthogonal to the plane defined by the outlet mouth passing through the center of the outlet mouth.
  • the casing (2) has an internal surface (23) facing the rotor (3).
  • the deflector (5) has an edge (50).
  • the deflector (5) has an internal surface (55) facing the rotor (3).
  • the internal surface (55) of the deflector is an extension of the internal surface (23) of the casing (2).
  • a peripheral channel (6) is formed, which is defined between a circumference (C) passing through the peripheral ends of the rotor (3) and the internal surface (22) of the casing (2) and the internal surface (55) of the deflector (5).
  • an air flow (F) flows, which is directed towards the outlet mouth (22).
  • the internal surface (23) of the casing has a spiral section along a sectional plane orthogonal to the axis of rotation (Z) of the rotor.
  • the rotor (3) has a center (P0) disposed on the axis of rotation (Z) and a radius (R0).
  • the radius (R0) of the rotor is considered as the radius of the circumference (C) passing through the peripheral ends of the blades of the rotor.
  • Fig. 5 shows a pair of Cartesian axes (X, Y) having the origin in the center (P0) of the rotor.
  • the axis of abscissas (X) is parallel to the outlet direction (A), wherein the outlet direction (A) is the axis of the outlet mouth (22).
  • the radius (R0) of the rotor is comprised between 55 and 65 mm, preferably 58.5 mm.
  • the internal surface (22) of the casing has a rectilinear section (70) that is joined with a first circular arc section (71) having a radius of curvature R1 and a center P1 disposed in the first quadrant of the Cartesian system (X, Y).
  • the distance between P0 and P1 is 15 - 18 mm.
  • the straight line passing through P0 and P1 has an angle of approximately 15°-30° with respect to the axis of abscissas (X). More precisely, the center P1 has coordinates P1 (14.8; 6.4) expressed in millimeters.
  • the radius R1 of the first section (71) is comprised between 80 and 90 mm, preferably 84.1 mm.
  • the first circular arc section (71) is joined to a second circular arc section (72) with radius of curvature R2 and a center P2 disposed in the third quadrant of the system of Cartesian axes (X, Y), in proximal position to the point of origin P0, i.e. the distance between P2 and P0 is lower than 1 mm. More precisely, the center P2 has coordinates P2 (-0.3; -0.6) expressed in millimeters.
  • the radius R2 of the second section is comprised between 63 and 70 mm, preferably 67.4 mm.
  • the second circular arc section (72) is joined to a third circular arc section (73) with radius of curvature R3 and a center P3 disposed in the fourth quadrant of the system of Cartesian axes (X, Y).
  • the distance between P0 and P3 is 6 - 7 mm.
  • the straight line passing through P0 and P3 has an angle of approximately 65°-80° with respect to the axis of abscissas (X). More precisely, the center P3 has coordinates P2 (-0.3; - 0.6) expressed in millimeters.
  • the radius R3 of the third section (73) is comprised between 57 and 65 mm, preferably 61.3 mm.
  • the internal surface (55) of the deflector (5) has a first circular arc section (53) joined to the third section (73) of the internal surface of the casing.
  • the first section (53) of the deflector has the same radius of curvature R3 and the same center P3 as the third section (73) of the casing.
  • the first circular arc section (53) of the deflector is joined to a second circular arc section (54) of the deflector with radius of curvature R4 and a center P4 disposed in the axis (X) of the system of Cartesian axes (X, Y), between the first and the fourth quadrant.
  • the distance between P0 and P4 is 1.5 - 2.1 mm. More precisely, the center P4 has coordinates P4 (1.8; 0) expressed in millimeters.
  • the radius R4 of the third section (73) is comprised between 57 and 65 mm, preferably 61.6 mm.
  • the second circular arc section (53) of the internal surface (55) of the deflector (5) is joined with an end portion (51).
  • a discontinuity line (E) is visible between the second section (53) of the deflector and the end portion (51) of the deflector.
  • the deflector has an end portion (51) defined between the discontinuity line (E) and the edge (50) of the deflector.
  • the end portion (51) has an internal surface with a rectilinear section along a sectional plane orthogonal to the axis of rotation (Z) of the rotor.
  • a rectilinear section of the end portion (51) of the deflector forms an angle ( ⁇ ) comprised between 80° and 100°, preferably approximately 90° with respect to the outlet direction (A) orthogonal to the flat surface defined by the outlet mouth (22).
  • a distance (W1) exists between the discontinuity line (P) and the rotor (3).
  • a distance (W2) exists between the edge (50) and the rotor (3), which is higher than the distance (W1) between the discontinuity line (P) and the rotor (3).
  • a first channel (V1) is formed, extending from the casing to the discontinuity line (E), and an ending channel (V2) extending from the discontinuity line (E) to the edge (50) of the deflector.
  • the ending channel (V2) is in correspondence of the end portion (51).
  • the first channel (V1) has a decreasing width going from the casing to the discontinuity line (E).
  • the ending channel (V2) has an increasing width going from the discontinuity line (P) to the edge (50). Therefore, the widest part of the ending channel (V2) is exactly in correspondence of the edge (50).
  • the end portion (51) has a length (L) equal to approximately 1/4 - 1/3 of the total length of the deflector (5). In other words, if the deflector (5) has a total length of 50 mm, the end portion (51) of the deflector has a length (L) comprised between 12.5 and 16.7 mm.
  • the edge (50) of the deflector is situated in a point P5 with P5 coordinates (63.75; 19.4).
  • Fig. 6 shows a table with the results of the tests carried out on an electrical fan of the known art called "Blower 2", such as the one shown in Figs. 1 , 2 and 3 .
  • the fluid dynamic efficiency (FDE) of the fan was increased by more than 9% (approximately 10%), passing from a FDE value of 18.22% to a value of approximately 27.41%.
  • the increase of the static pressure value and of the volumetric flow rate value of the air flow permits a total increase of the FDE value of approximately 10%.
  • the increase of the aerodynamic parameters is made possible by introducing the deflector in the special Cartesian configuration as described above.
  • a generic position of the deflector would obstruct the air flow coming out of the fan, for such a reason it is necessary to design and prototype a special geometry of the deflector, which takes into account the ratios between the external radius (R0) of the rotor and the radius (R1, R2, R3, R4) of the circumferences used to build the auger composed of the casing and the deflector.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP17155566.7A 2016-02-23 2017-02-10 Souffleur centrifuge électrique avec des dimensions géométriques particulières Withdrawn EP3211242A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUB2016A000970A ITUB20160970A1 (it) 2016-02-23 2016-02-23 Elettroventilatore centrifugo con particolari dimensioni geometriche.

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EP3211242A1 true EP3211242A1 (fr) 2017-08-30

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EP17155566.7A Withdrawn EP3211242A1 (fr) 2016-02-23 2017-02-10 Souffleur centrifuge électrique avec des dimensions géométriques particulières

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EP (1) EP3211242A1 (fr)
IT (1) ITUB20160970A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110513331A (zh) * 2019-08-31 2019-11-29 浙江理工大学 一种低噪蜗壳及离心通风机

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1050015B (de) 1957-02-27 1959-02-05 Easy Washing Machine Company L Zentrifugalgebläse mit austrittsspirale
US20120111045A1 (en) * 2009-08-05 2012-05-10 Mitsubishi Electric Corporation Wall-mounted air-conditioning apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1050015B (de) 1957-02-27 1959-02-05 Easy Washing Machine Company L Zentrifugalgebläse mit austrittsspirale
US20120111045A1 (en) * 2009-08-05 2012-05-10 Mitsubishi Electric Corporation Wall-mounted air-conditioning apparatus

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