EP1579797B1 - Unité de production d'une force d'aspiration à bruit faible et appareil de nettoyage comportant une telle unité - Google Patents

Unité de production d'une force d'aspiration à bruit faible et appareil de nettoyage comportant une telle unité Download PDF

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Publication number
EP1579797B1
EP1579797B1 EP05005762A EP05005762A EP1579797B1 EP 1579797 B1 EP1579797 B1 EP 1579797B1 EP 05005762 A EP05005762 A EP 05005762A EP 05005762 A EP05005762 A EP 05005762A EP 1579797 B1 EP1579797 B1 EP 1579797B1
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EP
European Patent Office
Prior art keywords
suction unit
motor
accordance
tumbler
casing
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.)
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Application number
EP05005762A
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German (de)
English (en)
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EP1579797A1 (fr
Inventor
Luigi Simonetti
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.)
Ametek Italia SRL
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Ametek Italia SRL
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Publication date
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Publication of EP1579797A1 publication Critical patent/EP1579797A1/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/22—Mountings for motor fan assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material

Definitions

  • This invention relates to a suction unit of the type including an impeller or turbine keyed axially on an electric motor to suck a stream of air axially.
  • the motor is traversed by a cooling-air stream expelled rearward therefrom.
  • This type of suction unit is generally fitted into a body of a cleaning apparatus such as a vacuum cleaner to have the suction inlet of the rotor facing into a suction chamber of the apparatus while the outgoing air stream is started out of the apparatus through purposeful slits.
  • the suction unit In cleaning apparatuses the suction unit is the greater source of noise and therefore manufacturers of apparatuses adopt soundproofing coverings that are applied in layers on the inner walls of the apparatus. This results in various problems such as greater manufacturing complexity and the need for larger dimensions of the apparatus compared with what would be needed for housing of the suction unit only. In addition, the effectiveness of soundproofed coverings is often unsatisfactory and the apparatuses remain excessively noisy anyway.
  • DE-A-3402603 discloses a suction unit with a motor surrounded by a soundproof casing, wherein the motor cooling air is evacuated through openings of the soundproof casing immediately after having been extracted from the motor.
  • US4733429 discloses a suction unit with a motor surrounded by a soundproof casing.
  • the general purpose of this invention is to remedy the above mentioned shortcomings by making available a powered low-noise suction unit.
  • FIG 1 shows a suction unit designated as a whole by reference number 10 for cleaning apparatuses.
  • the unit includes a suction turbine 11 arranged coaxially with an electric rotation motor 12.
  • the turbine is a known type with axial suction mouth 13 and therefore not further shown in detail.
  • the turbine includes known air-stream paths not shown here.
  • the motor is traversed by a stream of its cooling air that is evacuated from the end 14 of the motor opposite the turbine.
  • the motor has more than 15,000 rpm and advantageously at least around 20,000 rpm to 30,000 rpm.
  • the electric motor part of the unit is enclosed in a soundproofing casing 15 shaped generally like a tumbler with axis 16 coinciding virtually with the axis of the motor and with the tumbler edge 17 closed on the turbine casing or body.
  • the tumbler-like casing has its inner surface spaced from the motor walls and is provided with openings 18 arranged near said edge closed on the rotor.
  • the openings 18 on the edge are advantageously formed of rectangular notches in the edge.
  • the casing shape found particularly advantageous was found to be the one shown with cylindrical side wall and bottom joined without edges to the walls.
  • the openings 18 are arranged at regular distances along the edge and in particular are three in number arranged at 120° from each other.
  • each opening can advantageously have an angular extension ⁇ between 45° and 60° and preferably around 50°.
  • the area of the openings on the casing is at least equal to the area of the air extraction openings on the motor.
  • the rearward air flow out of the motor is forced into an S-shaped path that runs parallel to the motor wall and toward the impeller in the air space between the motor and the outer shell 15.
  • the tumbler has a wall formed by an external casing 19 of rigid plastic material and an internal layer 20 of fibrous or porous sound absorbent material.
  • Polypropylene was found to be a particularly advantageous material for the rigid external shell.
  • the thickness of the shell is between 1.5 mm and 5 mm and advantageously around 3 mm while the internal layer has a thickness between 10 mm and 20 mm and advantageously around 15 mm.
  • the casing has a bottom with members 21 projecting towards the motor to constitute supports on the motor, for example between or in radial spokes of the motor.
  • the projecting members are two in number arranged symmetrically around the motor axis and extending towards the motor in a direction parallel to said axis.
  • FIG 3 shows partially a cleaning apparatus 22, for example a vacuum cleaner, otherwise of prior art and therefore not shown in detail being easily imaginable to those skilled in the art,.
  • the apparatus 22 has a shell 23 containing the suction unit of FIG 1 so as to identify a suction chamber 24 into which faces the suction mouth 13 of the suction unit and a chamber 25 at the back insulated from the first and receiving the suction unit body and that has slots 26 for evacuation outward of the air sucked by the turbine.
  • the tumbler-shaped casing 15 of the suction unit has a bottom with external engagement seats 27 designed to at least partially support the cleaning apparatus unit.
  • the apparatus has internal fastening members 28 inserted with their end in the seats 27.
  • the members 28 can possibly be made of material such as for example rubber suitable for not transmitting operating vibrations.
  • FIG 4 shows a graph of the undeniable advantages of a suction unit realized in accordance with this invention.
  • a broken line shows the course of the noise of a prior art unit with a 15,000 rpm motor. Note the high noise peak around 5,000 Hz. From the comparison with the solid line showing the noise of a similar unit realized however in accordance with the principles of this invention the noise reduction is evident with a flattening toward the lower part of the noise curve at higher frequencies. The residual noise is truly much reduced. Entirely without increasing the transversal dimensions of the unit compared with prior art units of equal power (the transversal dimension is given by the turbine that remains unchanged). It should be noted that the transverse dimensions of a suction unit are the most important for the final dimensions of the apparatus.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)

Claims (18)

  1. Unité d'aspiration (10) pour un appareil de nettoyage, incluant un moteur de rotation électrique (12) et une turbine d'aspiration (11) comprenant un corps de turbine, qui est claveté coaxialement au moteur de rotation électrique (12), avec le moteur (12) étant traversé par un flux d'air pour son refroidissement et le moteur électrique (12) étant également confiné dans un boîtier insonorisé (15) formé généralement comme un tambour avec le bord du tambour (17) fermé par le corps de turbine, caractérisée en ce que le moteur (12) est pourvu d'une extrémité (14) opposée à la turbine, à travers laquelle l'air de refroidissement est évacué, le boîtier similaire à un tambour (15) a des ouvertures (18) disposées à proximité dudit bord (17) fermé par le corps de turbine, le boîtier similaire à un tambour (15) ayant sa surface interne à distance des parois du boîtier du moteur pour former un espace d'air entre la surface interne du boîtier similaire à un tambour et les parois du boîtier du moteur identifiant une trajectoire en forme de S pour l'air de refroidissement évacué qui est dirigé à partir de ladite extrémité du moteur (14), courant le long dudit espace d'air en direction de la turbine (11), vers les ouvertures (18) disposées à proximité dudit bord (17) fermé par le corps de turbine.
  2. Unité d'aspiration selon la revendication 1 caractérisée en ce que les ouvertures (18) sur le bord du tambour (17) sont formées à partir d'encoches rectangulaires sur ledit bord (17).
  3. Unité d'aspiration selon la revendication 1 caractérisée en ce que les ouvertures (18) sont disposées à des distances régulières le long du bord du tambour (17).
  4. Unité d'aspiration selon la revendication 3 caractérisée en ce que les ouvertures (18) sont au nombre de trois, disposées à 120° l'une de l'autre.
  5. Unité d'aspiration selon la revendication 1 caractérisée en ce que la somme des extensions des ouvertures (18) le long du bord du tambour (17) est comprise entre 1/3 et 1/2 du périmètre total du bord.
  6. Unité d'aspiration selon la revendication 1 caractérisée en ce que la surface des ouvertures (18) sur le boîtier est au moins égale à la surface des ouvertures présentes sur le moteur (12) pour l'extraction dudit flux d'air.
  7. Unité d'aspiration selon la revendication 6 caractérisée en ce que les ouvertures d'extraction sont placées à l'extrémité (14) du moteur (12) à proximité du fond du tambour (15).
  8. Unité d'aspiration selon la revendication 1 caractérisée en ce que le boîtier similaire à un tambour (15) a un fond relié sans bords aux parois.
  9. Unité d'aspiration selon la revendication 1 caractérisée en ce que le tambour (15) a une paroi formée par une enveloppe externe (19) de matière plastique rigide et une couche interne (20) de matière insonorisée fibreuse ou poreuse.
  10. Unité d'aspiration selon la revendication 9 caractérisée en ce que l'enveloppe externe (19) est en polypropylène.
  11. Unité d'aspiration selon la revendication 9 caractérisée en ce que l'épaisseur de l'enveloppe (19) est entre 1,5 mm et 5 mm et, avantageusement, d'environ 3 mm.
  12. Unité d'aspiration selon la revendication 9 caractérisée en ce que la couche interne (20) a une épaisseur entre 10 mm et 20 mm et, avantageusement, d'environ 15 mm.
  13. Unité d'aspiration selon la revendication 1 caractérisée en ce que le boîtier similaire à un tambour (15) a une paroi latérale cylindrique.
  14. Unité d'aspiration selon la revendication 1 caractérisée en ce que le boîtier similaire à un tambour (15) a un fond avec des éléments (21) s'avançant en saillie vers le moteur (12) pour constituer des supports sur le moteur.
  15. Unité d'aspiration selon la revendication 1 caractérisée en ce que les éléments en saillie (21) sont disposés symétriquement par rapport à l'axe du moteur (16) et s'étirent vers le moteur (12) dans une direction parallèle à son axe.
  16. Unité d'aspiration selon la revendication 1 caractérisée en ce que le boîtier similaire à un tambour (15) a un fond avec des sièges de mise en prise (27) sur l'extérieur, conçus comme au moins un support partiel de l'unité (10) dans un appareil de nettoyage (22).
  17. Unité d'aspiration selon la revendication 1 caractérisée en ce que le moteur (12) a un nombre de révolutions supérieur à 15 000 tr/min.
  18. Appareil de nettoyage (22) avec une unité d'aspiration (10) selon une quelconque des revendications ci-dessus.
EP05005762A 2004-03-24 2005-03-16 Unité de production d'une force d'aspiration à bruit faible et appareil de nettoyage comportant une telle unité Active EP1579797B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000577A ITMI20040577A1 (it) 2004-03-24 2004-03-24 Gruppo aspirante motorizzato a basso rumore per apparecchi di pulizia e apparecchio con esso
ITMI20040577 2004-03-24

Publications (2)

Publication Number Publication Date
EP1579797A1 EP1579797A1 (fr) 2005-09-28
EP1579797B1 true EP1579797B1 (fr) 2012-05-09

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EP (1) EP1579797B1 (fr)
IT (1) ITMI20040577A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107550395A (zh) * 2016-06-30 2018-01-09 江苏美的清洁电器股份有限公司 尘杯组件和具有其的手持吸尘器

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006027753A1 (de) * 2006-06-16 2007-12-20 Fakir Hausgeräte GmbH Staubsauger
JP2013085852A (ja) * 2011-10-21 2013-05-13 Hitachi Appliances Inc 電動送風機とそれを備えた電気掃除機
CN105604968A (zh) * 2016-02-29 2016-05-25 李锦标 一种静音型风机
CA2971068A1 (fr) 2016-06-30 2017-12-30 Jiangsu Midea Cleaning Appliances Co., Ltd. Aspirateur tenu a la main
IT202200010490A1 (it) * 2022-05-20 2023-11-20 Ecosys S R L Dispositivo silenziatore

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3402603A1 (de) * 1984-01-26 1985-08-01 Electrostar Schöttle GmbH & Co, 7313 Reichenbach Staubsauger
DE3443837A1 (de) * 1984-11-30 1986-06-05 Progress-Elektrogeräte Mauz & Pfeiffer GmbH & Co, 7000 Stuttgart Staubsauger
JP3071977B2 (ja) * 1993-05-10 2000-07-31 株式会社東芝 電気掃除機の消音装置
KR100233513B1 (ko) * 1997-09-23 1999-12-01 구자홍 진공청소기의 공기유로구조
WO2002051296A1 (fr) * 2000-12-22 2002-07-04 Arçelik A.S. Aspirateur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107550395A (zh) * 2016-06-30 2018-01-09 江苏美的清洁电器股份有限公司 尘杯组件和具有其的手持吸尘器
CN107550395B (zh) * 2016-06-30 2019-05-17 江苏美的清洁电器股份有限公司 尘杯组件和具有其的手持吸尘器

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ITMI20040577A1 (it) 2004-06-24
EP1579797A1 (fr) 2005-09-28

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