EP2665939B1 - Pompe électrique centrifuge destinée à l'aspiration de fluides aériformes avec un dispositif anti-infiltration de liquides - Google Patents
Pompe électrique centrifuge destinée à l'aspiration de fluides aériformes avec un dispositif anti-infiltration de liquides Download PDFInfo
- Publication number
- EP2665939B1 EP2665939B1 EP12704926.0A EP12704926A EP2665939B1 EP 2665939 B1 EP2665939 B1 EP 2665939B1 EP 12704926 A EP12704926 A EP 12704926A EP 2665939 B1 EP2665939 B1 EP 2665939B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gasket
- shaft
- motor
- suction
- electric pump
- 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.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims description 20
- 239000012530 fluid Substances 0.000 title claims description 15
- 238000001764 infiltration Methods 0.000 title claims description 13
- 238000007789 sealing Methods 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 15
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 239000013013 elastic material Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Images
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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- 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
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid 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
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
Definitions
- the present invention relates to the field of fluid machines for aeriform fluid.
- the present invention relates to a liquids anti-infiltration device for single or multistage centrifugal pumps and suction fans operated by an electric motor, particularly suitable for use as vacuum pumps in vacuum cleaners and floor washers, for cleaning surfaces through suction of air containing dust, foams or liquids, used in domestic and in industrial and professional environments.
- Centrifugal electric pumps for suction of aeriform fluids of conventional type essentially comprise an electric motor with high number of revolutions and a cylindrical suction box provided with an intake for suction of the fluid and with at least one exhaust port for discharge of said fluid. Movement of the fluid in the inner chamber of said box is caused by at least one impeller, or fan, contained therein, fitted onto the shaft of said electric motor.
- a ball bearing inserted in an annular cavity, is interposed at the coupling between the cover of said suction box and the main shaft of the electric motor, to enable rotation of the shaft and of the components fixed thereon.
- a similar pump is normally used in vacuum cleaners or floor washers to create a vacuum in a collection tank in which the dust or the liquid contained in the flow of air drawn up is deposited.
- centrifugal electric pumps for aeriform fluids have a serious drawback: during use, owing to the operating pressures and to the pressure differential created between the suction box and the motor area, due to the geometry of the components and the dimensional tolerances in play, leakages of liquid toward the area occupied by the motor can occur in proximity of the coupling bearing of the drive shaft in the suction box.
- Liquids, or even only foam or moisture in the air drawn up, can damage the ball bearing that supports the drive shaft, causing oxidation, premature wear, decreased efficiency and increased noise thereof.
- Said sealing device is obtained by a ring shaped gasket arranged in the annular cavity around the shaft and adapted to be deformed by compression, due to the force exerted by the cover of the suction box on a metal washer associated with the bearing.
- Said gasket is fixed to said cover and the drive shaft rotates by sliding thereon.
- the surface on which the gasket acts by rubbing i.e. the outer surface of the drive shaft, must be suitably treated to obtain particular reductions in the roughness values. This is somewhat complicated and onerous to produce on curved surfaces.
- DE 91 11 745 U1 discloses a liquids anti-infiltration device, usually mounted to the motors of kitchen vent hoods.
- Said decvice comprises a gasket with a cylindrical main body associated aligned with the axis of the drive shaft of the vent hood and a truncated-cone shaped sealing lip which operates by sliding directly on the closing cover of the motor, without the interposition of accessory and compensation means of the wear of said gasket.
- the aim of the invention is to overcome these limits, by producing a centrifugal electric pump for suction of aeriform fluids provided with a liquids anti-infiltration device to protect the drive shaft support bearing.
- a further aim of the invention is to produce an anti-filtration device that is highly reliable, easy to mount, adaptable to any drive shaft and tolerance between components, with increased durability, which prevents or reduces accessory fixing means and limits the costs for manufacturing and surface treatment of the metal sealing components.
- a centrifugal electric pump for suction of aeriform fluids with liquids anti-infiltration device comprising:
- said gasket is of the V-Ring type.
- a spacer is interposed between said drive shaft and said gasket.
- the main advantage consists in the excellent liquid seal produced between the suction box of said centrifugal electric pump and its electric motor, due to the shape and to the type of gasket used, and to the relative method of positioning thereof.
- the gasket operates in an optimal manner, with sliding friction on an abutment surface perpendicular to the axis of said shaft, constituted by the flat face of a metal adapter ring.
- a further advantage consists in the fact that the surface of the flat face of said metal ring can be easily subjected to honing treatments, without excessive increases in costs, obtaining an improved seal between the gasket and said ring, reduced wear of the lip of the gasket and increased durability of the device.
- the metal ring therefore makes it possible to use suitable materials and surface treatments suitable to optimize cooperation with the sealing lip of the gasket.
- the anti-infiltration device according to the invention due to cooperation between the components, to their positioning and to the configuration of the gasket, ensure a perfect seal even in the case of partial wear of said gasket: progressive wear of the sealing lip is compensated through the external pressure generated in the suction box which is exerted on said gasket, which in any case defines its contact on the flat face of the metal abutment ring.
- a further advantage consists in the simplicity with which said gasket is maintained in position solely through the operating pressure inside the electric pump, without the addition of fixing components and particular clamping systems.
- FIG. 1 , 2 and 4 there is shown a centrifugal electric pump for suction of aeriform fluids provided with a liquids anti-infiltration device according to a preferred embodiment of the invention.
- Said electric pump 1 is essentially constituted by an electric motor 2 provided with a drive shaft 3, by a suction box 4 and by fans 8 arranged for driving a flow of air F.
- Said suction box 4 has a cylindrical shape, comprises a circular bottom provided with a suction inlet 5 arranged centrally and a lateral surface provided with at least one exhaust port 6, and is associated with said shaft 3 with a bearing 9 interposed.
- Said box 4 is closed at the top by a cover 7 adapted also to act as base for said motor 2.
- Said fans 8 are fitted onto said drive shaft 3 and are driven in movement by said motor 2.
- An annular cavity 18 arranged for housing said bearing 9 is produced between said motor shaft 3 and said cover 7.
- the anti-filtration device 10 is positioned in said annular cavity 18.
- the liquids anti-infiltration device 10 comprises a gasket 11 and a metal ring 12.
- Said gasket 11 comprises a cylindrical ring shaped main body 13, with inner diameter suitable to be fitted onto said shaft 3, and a truncated-cone shaped sealing lip 14.
- the gasket 11 is of the V-Ring type, with elastic body 13 and sealing lip 14.
- Said gasket 11 is arranged coaxially on said drive shaft 3 and rotates therewith, if necessary with a closing spacer 15 interposed, while a metal ring 12, arranged for acting as abutment surface for sliding of the sealing lip 14 of said gasket 11, is associated on the cover 7 of said suction box.
- Gaskets of this type are normally made of nitrile rubber.
- a rubber reducer 16 with the function of adapting the seat of the annular cavity 18 and retaining the bearing 9, is interposed between said metal ring 12, the cover 7 and the bearing 9.
- the operating methods of the anti-infiltration device are as follows.
- the V-Ring gasket is mounted on the motor shaft 3 and rotates therewith.
- the main body 13 is mounted with interference on the shaft 3 and maintains the lip 14 in position.
- the lip 14 produces the liquid seal against the abutment surface of the metal ring 12, arranged perpendicularly to the shaft 3.
- the elasticity of the sealing lip 14 and the high pressure inside the suction box 4 help to maintain the spacer 15 pressed against the cover 7, also compressing the gasket 11.
- the lip 14 is deformed, increasing the surface area thereof that rests on the metal ring 12 and thus preventing any liquids from leaking inside the motor 2.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Mechanical Sealing (AREA)
- Centrifugal Separators (AREA)
Claims (3)
- Une pompe électrique centrifuge (1) pour l'aspiration de fluides aériformes munie d'un dispositif anti-infiltration de liquides, comprenant :- un moteur électrique (2) équipé d'un arbre (3) ;- une boîte d'aspiration cylindrique (4) associé audit moteur (2), munie d'une admission (5) pour fluide aériforme positionné centralement par rapport à une base (4') de ladite boîte, au moins un port d'échappement (6) disposé sur la surface latérale (4") de celle-ci et avec un couvercle de fermeture (7) également disposé pour agir comme base pour ledit moteur (2) ;- au moins un ventilateur (8), cannelé sur ledit arbre (3) en mis en mouvement par ledit moteur (2), disposé pour aspirer un flux d'air (F) depuis ladite admission (5), le faire tourner et l'évacuer hors de ladite boîte d'aspiration (4) par ledit port d'échappement (6) au minimum,- un roulement (9) interposé entre ledit arbre et ladite base dudit couvercle de fermeture (7) ;- un dispositif anti-infiltration de liquides (10), disposé entre ledit moteur électrique (2) et ladite boîte s'aspiration (4), muni d'un joint (11),où ledit joint (11) tourne avec ledit arbre moteur (3) et comprend un corps principal cylindrique (13) associé audit arbre, et une lèvre d'étanchéité de forme tronconique (14) où ledit corps principal (13) et ladite lèvre d'étanchéité (14) sont réalisés en matériau élastique, caractérisée par le fait que ladite lèvre d'étanchéité (14) coopère avec une face plate d'une bague métallique (12), prévue entre le roulement et le couvercle (7) de ladite boîte d'aspiration (4) pour produire une fermeture étanche à l'eau de ladite boîte.
- Une pompe électrique centrifuge (1) selon la revendication 1, caractérisée par le fait que ledit joint (11) est de type V-Ring.
- Une pompe électrique centrifuge (1) selon la revendication 1, caractérisée par le fait qu'une entretoise (15) est intercalée entre ledit arbre moteur (3) et ledit joint (11).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RS20190204A RS58371B1 (sr) | 2011-01-18 | 2012-01-16 | Centrifugalna električna pumpa za usisavanje vazdušnih fluida sa protiv-infiltracionim uređajem za tečnosti |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000002A ITCR20110002A1 (it) | 2011-01-18 | 2011-01-18 | Elettropompa centrifuga per aspirazione di fluidi aeriformi con dispositivo anti-infiltrazione di liquidi |
PCT/IT2012/000015 WO2012098568A1 (fr) | 2011-01-18 | 2012-01-16 | Pompe électrique centrifuge destinée à l'aspiration de fluides aériformes avec un dispositif anti-infiltration de liquides |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2665939A1 EP2665939A1 (fr) | 2013-11-27 |
EP2665939B1 true EP2665939B1 (fr) | 2018-12-12 |
Family
ID=43975302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12704926.0A Active EP2665939B1 (fr) | 2011-01-18 | 2012-01-16 | Pompe électrique centrifuge destinée à l'aspiration de fluides aériformes avec un dispositif anti-infiltration de liquides |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130302189A1 (fr) |
EP (1) | EP2665939B1 (fr) |
CN (1) | CN103562555A (fr) |
IT (1) | ITCR20110002A1 (fr) |
RS (1) | RS58371B1 (fr) |
WO (1) | WO2012098568A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN208522576U (zh) * | 2017-09-13 | 2019-02-19 | 日本电产株式会社 | 马达、送风装置以及吸尘器 |
JP7202596B2 (ja) * | 2018-06-19 | 2023-01-12 | 株式会社アガツマ | 軸受パッキン及び給水ポンプ |
CN109281847A (zh) * | 2018-10-12 | 2019-01-29 | 上海舟水电器有限公司 | 一种新型的防水风扇结构 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4380416A (en) * | 1978-09-25 | 1983-04-19 | Societe Internationale De Mecanique Industrielle S.A. | Centrifugal pumps |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9111745U1 (fr) * | 1991-09-20 | 1992-12-10 | Ebm Elektrobau Mulfingen Gmbh & Co, 7119 Mulfingen, De | |
US6472786B1 (en) | 2000-11-17 | 2002-10-29 | Ametek, Inc. | Bearing protection assembly for motors |
CN2924097Y (zh) * | 2005-10-17 | 2007-07-18 | 宜兴市宙斯泵业有限公司 | 砂浆泵用机械密封 |
DE602006006983D1 (de) * | 2006-05-30 | 2009-07-09 | Skf Ab | Reibungsarmer Dichtring für eine Kreiselpumpe, insbesondere für eine Pumpe für Verbrennungsmotorkühlmittel |
US8226384B2 (en) * | 2008-05-06 | 2012-07-24 | Ametek, Inc. | Labyrinth seal for a motor-fan unit |
US8152449B2 (en) * | 2008-12-10 | 2012-04-10 | Honeywell International Inc. | Vacuum generator seal |
US8297949B1 (en) * | 2009-02-17 | 2012-10-30 | Mancl Scott C | Bearing seal for a wet vacuum motor |
-
2011
- 2011-01-18 IT IT000002A patent/ITCR20110002A1/it unknown
-
2012
- 2012-01-16 WO PCT/IT2012/000015 patent/WO2012098568A1/fr active Application Filing
- 2012-01-16 RS RS20190204A patent/RS58371B1/sr unknown
- 2012-01-16 US US13/979,898 patent/US20130302189A1/en not_active Abandoned
- 2012-01-16 EP EP12704926.0A patent/EP2665939B1/fr active Active
- 2012-01-16 CN CN201280010863.6A patent/CN103562555A/zh active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4380416A (en) * | 1978-09-25 | 1983-04-19 | Societe Internationale De Mecanique Industrielle S.A. | Centrifugal pumps |
Also Published As
Publication number | Publication date |
---|---|
WO2012098568A1 (fr) | 2012-07-26 |
ITCR20110002A1 (it) | 2012-07-19 |
RS58371B1 (sr) | 2019-03-29 |
EP2665939A1 (fr) | 2013-11-27 |
CN103562555A (zh) | 2014-02-05 |
US20130302189A1 (en) | 2013-11-14 |
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