EP1579797A1 - Powered low-noise suction generating unit for a cleaning apparatus and apparatus with same - Google Patents
Powered low-noise suction generating unit for a cleaning apparatus and apparatus with same Download PDFInfo
- Publication number
- EP1579797A1 EP1579797A1 EP05005762A EP05005762A EP1579797A1 EP 1579797 A1 EP1579797 A1 EP 1579797A1 EP 05005762 A EP05005762 A EP 05005762A EP 05005762 A EP05005762 A EP 05005762A EP 1579797 A1 EP1579797 A1 EP 1579797A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- suction unit
- accordance
- motor
- openings
- edge
- 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.)
- Granted
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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
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- 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
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- 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
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- 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
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- 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.
- the general purpose of this invention is to remedy the above mentioned shortcomings by making available a powered low-noise suction unit.
- a suction unit for cleaning apparatuses including a suction turbine keyed coaxially to an electric rotation motor with the motor traversed by a stream of air for its cooling characterized in that the part of the electric motor is enclosed in a soundproofing casing shaped generally like a tumbler with the edge of the tumbler closed on the turbine body and the tumbler-like casing having its internal surface spaced from the walls of the motor and having openings arranged near said edge closed on the turbine body.
- 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.
- 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)
Abstract
Description
Claims (18)
- Suction unit for cleaning apparatuses including a suction turbine keyed coaxially to an electric rotation motor with the motor traversed by a stream of air for its cooling characterized in that the electric motor part is enclosed in a soundproofing casing shaped generally like a tumbler with the tumbler edge closed on the turbine body and the tumbler-like casing having its internal surface spaced from the motor walls and having openings arranged near said edge closed on the turbine body.
- Suction unit in accordance with claim 1 characterized in that the openings on the edge are formed from rectangular notches on said edge.
- Suction unit in accordance with claim 1 characterized in that the openings are arranged at regular distances along the edge.
- Suction unit in accordance with claim 3 characterized in that the openings are three in number arranged at 120° from each other.
- Suction unit in accordance with claim 1 characterized in that the sum of the extensions of the openings along the edge is between 1/3 and 1/2 of the total edge perimeter.
- Suction unit in accordance with claim 1 characterized in that the area of the openings on the casing is at least equal to the area of the openings of said air stream extraction openings on the motor.
- Suction unit in accordance with claim 6 characterized in that the extraction openings are placed in the end of the motor near the bottom of the tumbler.
- Suction unit in accordance with claim 1 characterized in that the casing has a bottom connected without edges to the walls.
- Suction unit in accordance with claim 1 characterized in that the tumbler has a wall formed by an external shell of rigid plastic material and an internal layer of fibrous or porous soundproofing material.
- Suction unit in accordance with claim 9 characterized in that the external shell is of polypropylene.
- Suction unit in accordance with claim 9 characterized in that the thickness of the shell is between 1.5 mm and 5 mm and advantageously around 3 mm.
- Suction unit in accordance with claim 9 characterized in that the internal layer has a thickness between 10 mm and 20 mm and advantageously around 15 mm.
- Suction unit in accordance with claim 1 characterized in that the shell has a cylindrical side wall.
- Suction unit in accordance with claim 1 characterized in that the shell has a bottom with members projecting toward the motor to constitute supports on the motor.
- Suction unit in accordance with claim 1 characterized in that the projecting members are arranged symmetrically to the motor axis and extend toward the motor in a direction parallel to its axis.
- Suction unit in accordance with claim 1 characterized in that the shell has a bottom with engagement seats designed as at least partial support on the outside of the unit in a cleaning apparatus.
- Suction unit in accordance with claim 1 characterized in that the motor has a number of revolutions greater than 15,000 rpm.
- Cleaning apparatus with a suction unit in accordance with any one of the above claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI20040577 | 2004-03-24 | ||
IT000577A ITMI20040577A1 (en) | 2004-03-24 | 2004-03-24 | LOW NOISE MOTORIZED SUCTION UNIT FOR CLEANING APPLIANCES AND APPLIANCE WITH IT |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1579797A1 true EP1579797A1 (en) | 2005-09-28 |
EP1579797B1 EP1579797B1 (en) | 2012-05-09 |
Family
ID=34856932
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05005762A Active EP1579797B1 (en) | 2004-03-24 | 2005-03-16 | Powered low-noise suction generating unit for a cleaning apparatus and apparatus with same |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1579797B1 (en) |
IT (1) | ITMI20040577A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1867265A3 (en) * | 2006-06-16 | 2007-12-26 | Fakir Hausgeräte GmbH | Vacuum cleaner |
JP2013085852A (en) * | 2011-10-21 | 2013-05-13 | Hitachi Appliances Inc | Electric fan and vacuum cleaner with the same |
CN105604968A (en) * | 2016-02-29 | 2016-05-25 | 李锦标 | Silent fan |
WO2018000461A1 (en) * | 2016-06-30 | 2018-01-04 | 江苏美的清洁电器股份有限公司 | Dust cup assembly and handheld vacuum cleaner having same |
IT202200010490A1 (en) * | 2022-05-20 | 2023-11-20 | Ecosys S R L | SILENCER DEVICE |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107550395B (en) * | 2016-06-30 | 2019-05-17 | 江苏美的清洁电器股份有限公司 | Dirt cup component and hand-held cleaners with it |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3402603A1 (en) * | 1984-01-26 | 1985-08-01 | Electrostar Schöttle GmbH & Co, 7313 Reichenbach | Vacuum cleaner |
US4733429A (en) * | 1984-11-30 | 1988-03-29 | Progress-Elektrogerate Mauz & Pfeiffer Gmbh & Co. | Vacuum cleaner |
JPH0731564A (en) * | 1993-05-10 | 1995-02-03 | Toshiba Corp | Sound suppressing device for vacuum cleaner |
DE19843719A1 (en) * | 1997-09-23 | 1999-04-01 | Lg Electronics Inc | Cylinder vacuum cleaner for domestic use |
WO2002051296A1 (en) * | 2000-12-22 | 2002-07-04 | Arçelik A.S. | Vacuum cleaner |
-
2004
- 2004-03-24 IT IT000577A patent/ITMI20040577A1/en unknown
-
2005
- 2005-03-16 EP EP05005762A patent/EP1579797B1/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3402603A1 (en) * | 1984-01-26 | 1985-08-01 | Electrostar Schöttle GmbH & Co, 7313 Reichenbach | Vacuum cleaner |
US4733429A (en) * | 1984-11-30 | 1988-03-29 | Progress-Elektrogerate Mauz & Pfeiffer Gmbh & Co. | Vacuum cleaner |
JPH0731564A (en) * | 1993-05-10 | 1995-02-03 | Toshiba Corp | Sound suppressing device for vacuum cleaner |
DE19843719A1 (en) * | 1997-09-23 | 1999-04-01 | Lg Electronics Inc | Cylinder vacuum cleaner for domestic use |
WO2002051296A1 (en) * | 2000-12-22 | 2002-07-04 | Arçelik A.S. | Vacuum cleaner |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30) * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1867265A3 (en) * | 2006-06-16 | 2007-12-26 | Fakir Hausgeräte GmbH | Vacuum cleaner |
JP2013085852A (en) * | 2011-10-21 | 2013-05-13 | Hitachi Appliances Inc | Electric fan and vacuum cleaner with the same |
CN105604968A (en) * | 2016-02-29 | 2016-05-25 | 李锦标 | Silent fan |
WO2018000461A1 (en) * | 2016-06-30 | 2018-01-04 | 江苏美的清洁电器股份有限公司 | Dust cup assembly and handheld vacuum cleaner having same |
US10307026B2 (en) | 2016-06-30 | 2019-06-04 | Jiangsu Midea Cleaning Appliances Co., Ltd. | Dust cup assembly and handheld cleaner having the same |
IT202200010490A1 (en) * | 2022-05-20 | 2023-11-20 | Ecosys S R L | SILENCER DEVICE |
Also Published As
Publication number | Publication date |
---|---|
EP1579797B1 (en) | 2012-05-09 |
ITMI20040577A1 (en) | 2004-06-24 |
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