EP0781523A1 - Schutzvorrichtung für Lager eines Motor-Gebläseaggregats - Google Patents

Schutzvorrichtung für Lager eines Motor-Gebläseaggregats Download PDF

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Publication number
EP0781523A1
EP0781523A1 EP95309544A EP95309544A EP0781523A1 EP 0781523 A1 EP0781523 A1 EP 0781523A1 EP 95309544 A EP95309544 A EP 95309544A EP 95309544 A EP95309544 A EP 95309544A EP 0781523 A1 EP0781523 A1 EP 0781523A1
Authority
EP
European Patent Office
Prior art keywords
fan
bearing
protection system
bearing protection
top plate
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Withdrawn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
EP95309544A
Other languages
English (en)
French (fr)
Inventor
Nick Vona, Jr.
George E. Marsinek
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 Inc
Original Assignee
Ametek Inc
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 Ametek Inc filed Critical Ametek Inc
Priority to EP95309544A priority Critical patent/EP0781523A1/de
Publication of EP0781523A1 publication Critical patent/EP0781523A1/de
Withdrawn legal-status Critical Current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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F04D17/164—Multi-stage fans, e.g. for vacuum cleaners
    • 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
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans

Definitions

  • the invention herein resides in the art of vacuum motors and, more particularly, to the type employed in jet spray extractor cleaners such as carpet cleaners and the like. Specifically, the invention relates to vacuum motors employing means for protecting the fan/motor shaft bearing from effluent such as water, soap, foam, or the like.
  • jet spray extractors for cleaning carpets and the like.
  • Such jet spray extractors typically employ a motor maintained within a motor housing and having a shaft passing therefrom through a barrier wall to a fan maintained within a fan housing.
  • An appropriate bearing is typically maintained within the barrier wall for receipt of the shaft interconnecting the motor and fan.
  • the fan With the fan generating a vacuum for extracting moisture and dirt from the carpet, an environment of dirt laden air, water, detergent, and foam is present within the chamber receiving the fan.
  • the shaft bearing being maintained within the wall separating the fan and motor housings, the bearing is in close proximity to such environment and, absent means for protecting or isolating the bearing from the environment, it often becomes subjected to that environment and fails as a result.
  • the moisture, detergent, and foam attacks the lubricant of the bearing, causing the same to fail.
  • Another aspect of the invention is the provision of a vacuum motor bearing protection system for use in an effluent vacuum device which eliminates the need for complex and costly seals, vanes, and labyrinths.
  • a further aspect of the invention is the provision of a vacuum motor bearing protection system for use in an effluent vacuum device which is highly effective and cost efficient for implementation in household or consumer extractor units.
  • Yet an additional aspect of the invention is the provision of a vacuum motor bearing protection system for use in an effluent vacuum device which provides an effective bearing seal by the application of apertures in the fan plate nearest the bearing.
  • Still a further aspect of the invention is the provision of a vacuum motor bearing protection system for use in an effluent vacuum device which enhances the bearing seal by the inclusion of exterior fan blades adjacent the bearing.
  • Still another aspect of the invention is the provision of a vacuum motor bearing protection system for use in an effluent vacuum device which enhances the bearing seal by the inclusion of vanes extending from the motor housing adjacent the fan and bearing.
  • an additional aspect of the invention is the provision of a vacuum motor bearing protection system for use in an effluent vacuum device which enhances the bearing seal by the inclusion of vanes on a spacer interposed between the fan and bearing.
  • a vacuum motor bearing protection system comprising: a barrier wall; a motor on one side of said wall; a shaft extending from said motor, passing through said wall, and rotatable within a bearing; and a fan received upon said shaft on a side of said wail opposite said motor, said fan comprising a top plate and a bottom plate with arcuate vanes interposed therebetween, said bottom plate having a central opening for drawing air from outside of said fan into said vanes and said top plate having at least one aperture therein for drawing air from an area adjacent said bearing and into said vanes.
  • a bearing protection system in a vacuum generating device having a motor maintained on a first side of a wall and a shaft extending from the motor through the wall and receiving a fan on a second side of the wall, the shaft rotating within a bearing maintained within the wall, such improvement comprising: a pair of apertures passing through a top plate of the fan, said apertures being diametrically opposed with respect to the shaft, said apertures being in juxtaposition to the bearing.
  • a vacuum motor bearing protection system is designated generally by the numeral 10.
  • a motor housing 12 provides, in pertinent part, a barrier wall between a motor chamber 14 and a fan chamber 16.
  • a bore 18 passes through the motor housing 12 and receives an appropriate bearing 20 therein.
  • the bearing 20 may be of any suitable type such as a sleeve bearing, ball bearing assembly, or the like.
  • the bearing 20 receives a shaft 22 which interconnects a motor 24 within the motor chamber 14 and a fan 26 maintained within the fan chamber 16.
  • the fan 26 comprises a plurality of stacked fan elements or layers 28, 30 as shown.
  • the motor chamber 14 is isolated by a barrier wall of the motor housing 12 from the fan chamber 16. Accordingly, the motor 24 is not subjected to the environment of the fan chamber 16. Indeed, the motor chamber 14 will typically receive and pass motor cooling air across the motor 24, such air being from the ambient and of a clean and dry nature.
  • the fan chamber 16 will typically receive the working air of the assembly, such as a jet spray extractor, employing the vacuum motor bearing protection system 10. Accordingly, the fan chamber 16 will contain an environment of liquid, foam, detergent, and dirt. It is, of course, most desirable to isolate the bearing 20 from such environment.
  • an appropriate spacer 32 is interposed between the bearing 20 and the closest fan element 28. Further, and as is customary in the art, a nut, keeper, or the like is secured to the shaft 22 opposite the fan element furthermost from the spacer 22 such that the fan elements are maintained in fixed position along the shaft 22 in stacked relationship. The total number of fan elements is, accordingly stacked between the spacer 32 and an appropriate nut or keeper engaging the shaft 22.
  • the fan element 28 comprises a top plate or disk 34 and a bottom plate or disk 36 having a plurality of arcuate vanes 38 interposed therebetween.
  • the vanes 38 are preferably curved backward with respect to rotation, but may be cupped in the direction of rotation, as is well known to those skilled in the art.
  • the fan element 30 would include a corresponding top and bottom plate with similar arcuate vanes sandwiched therebetween.
  • rivets 40 extend from the arcuate vane 38 and through the top and bottom plates 34, 36 for purposes of securing the vanes 38 in appropriate position.
  • an annular opening 42 is provided in the bottom plate 36 to create an eye of the associated fan element 28. Air is drawn from outside of the fan element and into the vanes between the plates 34, 36, from which the air is exhausted.
  • an aperture 44 is provided in the plate 34 for receiving the shaft 22 interconnecting the motor 24 with the fan assembly 26.
  • a spacer 48 is received upon the shaft 22 and interposed between the fan 28 and the fan 30 to maintain an appropriate spacing therebetween.
  • the fan 30 has an annular opening 50 in the bottom plate 52 thereof.
  • a top plate 54 is parallel to the bottom plate 52 such that the arcuate vanes 56 may be maintained therebetween in much the same fashion as the vanes 38 are maintained within the fan 28.
  • An aperture in the top plate 54 receives the shaft 22 in tight fitting relation. Additionally, the spacer 48 may serve to seal such aperture.
  • fan elements 28 may also be positioned upon the shaft 22, the same being axially displaced therealong.
  • fan elements 28, 30 are secured to the shaft 22 and rotatable therewith so that air is drawn through an inlet into the fan chamber 16 at a point beneath the fan assembly 26. The air winds in serpentine fashion sequentially through the fan elements spaced along the shaft 22 until reaching the uppermost fan element 28 from which it is exhausted through an exhaust port in the housing defining the fan chamber 16.
  • apertures 46 are provided in the top plate 34 of the fan 28.
  • the apertures 46 are uniformly circumferentially spaced about the aperture 44 receiving the shaft 22. While two such apertures 46 are shown and preferred, it will be understood that other numbers of such apertures 46 may be provided. In any event, it is most desired that the apertures 46 be interposed in juxtaposition to the bearing 20 and the spacer 32 interposed between the bearing 20 and the top plate 34. Additionally, and as will be readily appreciated by those skilled in the art, with the apertures 46 being closer to the shaft 22 than the outer circumference of the aperture 42, the apertures 46 fall within the eye of the fan.
  • the apertures 46 allow the negative pressure generated in the eye of the fan during rotation of the fan 28 to draw in water or foam that has found its way between the top plate 34 and the motor housing 12 back into the working side or inside of the fan 28.
  • water or foam which would otherwise approach the bearing 20 is drawn through the apertures 46 into the eye of the fan and away from the bearing 20 and spacer 32. Accordingly, any liquid or foam that would otherwise damage the bearing 20 is pulled to the inside of the fan and thus can do no damage.
  • the scavenging system of the invention operates only when the fan is running. Accordingly, if the system employing the motor 24 and fan 26 is tipped such that foam and water attacks the bearing 20 and the fan is not operated, damage to the bearing may result despite the scavenging system just described. However, once the motor is energized, the fan assembly 28 with the holes 46 will pump away effluent from the area about the shaft 22, spacer 32, and bearing 20. Indeed, the instant invention provides a method of reducing the potential damage to a bearing in a system such as that described, as well as to reduce the possibility of a shaft seal area leak in any application that involves a rotating impeller that has the bearing on the opposite side of the fan eye. Fan units which are employed for picking up liquids such as jet spray extractors and wet/dry vacuum units may particularly benefit from the invention just described.
  • a vacuum motor bearing protection system in accordance with the invention is designated by the numeral 60.
  • a motor housing 62 receives a bearing 64 having a motor/fan shaft 66 passing therethrough as with the embodiment of Fig. 1.
  • a spacer 68 is interposed between the housing 62 and a fan 70.
  • the top plate of the fan 70 is provided with apertures 72 for purposes of drawing foam or liquid away from the bearing 64 and toward the eye of the fan 70.
  • the system 60 is also provided with a plurality of vanes 74 extending downwardly from the housing 62 and interposed in the space between the housing 62 and the top plate of the fan 70.
  • the vanes 74 are arcuate, although it has been found that linear vanes are suitable for enhancing the pumping action of the apertures 72 during rotation of the fan 70.
  • the radially disposed vanes 74 seek to direct the foam and water inwardly toward the eye of the fan 70 for entry therein through the apertures 72.
  • a vacuum motor bearing protection system may employ a fan 76 such as that depicted in Fig. 5.
  • the top plate of the fan 76 is provided with a plurality of upwardly extending vanes or ribs 78 which are displaced radially outwardly from the apertures 80 positioned on either side of the hole 82 provided for the shaft 66.
  • an air passage opening 84 is provided within the bottom plate of the fan 76 and having a diameter preferably greater than the separation of the apertures 80. It has been found with the structure of Fig.
  • vanes 78 on the top plate of the fan 76 enhance the pumping action by directing liquid and foam radially inwardly toward the apertures 80, for passage into the eye of the fan 76.
  • the vanes 78 may be substantially similar to the vanes 74 in the embodiment of Fig. 4, but for the positioning of the vanes upon the fan itself, rather than the housing. Indeed, in the embodiment of Fig. 5, it is contemplated that the vanes 78 will push the effluent to the outer edge of the top fan plate, likely eliminating the need for the aperture 80.
  • a motor housing 88 maintains a bearing 90 which, in turn, receives a fan/motor shaft 92. While the motor is not shown in the illustration of Fig. 6, it will be appreciated that such motor would be on the opposite side of the housing 88 from the fan 94, which is shown as mounted to the shaft 92. As discussed above, a plurality of apertures 96 are uniformly spaced about the centerpoint of the top plate of the fan 94.
  • a spacer 98 is, in standard fashion, interposed between the housing 88 or bearing 90 and the fan 94.
  • the spacer 98 is uniquely configured to assist in the bearing seal technique of the instant invention by enhancing the pumping or scavenging action attained by the apertures 96 in the fan 94.
  • the spacer 98 is provided with an axial bore 100 for receiving the shaft 92.
  • a disk-shaped base 102 at the bottom of the spacer 98 and in contacting engagement with the top plate of the fan 94, is substantially disk-shaped with a scalloped periphery.
  • the top 106 of the spacer 98 is substantially of an annular disk shape, and is adapted for engagement with the housing 88 or bearing 90.
  • a plurality of vanes or ribs 108 extend angularly upwardly from the base 102 to the outer sidewall of the cylindrical body portion 110 which is interposed between the top 106 and base 102.
  • a plurality of curvate surfaces 112 extend as webs between the vanes or ribs 108 from the cylindrical body portion 110 to the scalloped periphery 104.
  • the scavenging by the apertures 96 is facilitated and enhanced by the vanes or ribs 108 which extend downwardly and radially outwardly from the area of the bearing 90 toward the apertures 96, and by the curvate surfaces 112 interposed therebetween and similarly providing a chute for such moisture and associated debris.
  • the instant invention contemplates the provision of scavenging apertures in the top plate of the top fan assembly and in juxtaposition to the bearing interposed between the fan and motor assemblies.
  • the apertures are positioned within the eye of the fan so as to draw moisture, liquid, or debris from an area adjacent the fan/motor bearing and into the low pressure of the fan eye. Such material is then disbursed through the exhaust port of the unit along with the other exhaust air. Vanes may be added to the housing, fan, or the spacer interposed therebetween to assist in the scavenging and pumping action for removal of such damaging material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP95309544A 1995-12-29 1995-12-29 Schutzvorrichtung für Lager eines Motor-Gebläseaggregats Withdrawn EP0781523A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95309544A EP0781523A1 (de) 1995-12-29 1995-12-29 Schutzvorrichtung für Lager eines Motor-Gebläseaggregats

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP95309544A EP0781523A1 (de) 1995-12-29 1995-12-29 Schutzvorrichtung für Lager eines Motor-Gebläseaggregats

Publications (1)

Publication Number Publication Date
EP0781523A1 true EP0781523A1 (de) 1997-07-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP95309544A Withdrawn EP0781523A1 (de) 1995-12-29 1995-12-29 Schutzvorrichtung für Lager eines Motor-Gebläseaggregats

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EP (1) EP0781523A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1102370C (zh) * 1996-08-12 2003-03-05 三星光州电子株式会社 用于净化设备的电扇
ITTO20110209A1 (it) * 2011-03-09 2011-06-08 Fise Spa Estrattore perfezionato per separatore di liquidi di macchine aspira-liquidi.

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB246659A (en) * 1925-01-21 1926-02-04 British Vacuum Cleaner And Eng Improvements in single or multi-stage fan exhausters
FR844912A (fr) * 1937-10-20 1939-08-04 Electrolux Ab Perfectionnements aux appareils pour le nettoyage par le vide du type à axe horizontal
US2731194A (en) * 1953-02-02 1956-01-17 Moss A Kent Vacuum cleaner blower
US2822122A (en) * 1955-05-06 1958-02-04 American Machine & Metals Vacuum cleaner motor and fan assembly
US4088424A (en) * 1977-05-23 1978-05-09 Ametek, Inc. Wet pick-up vacuum unit motor bearing air seal
EP0020814A1 (de) * 1979-06-06 1981-01-07 Ametek, Inc. Sauggerät für nasse Betriebsweise
GB2181185A (en) * 1985-10-01 1987-04-15 Rexair Inc Improved air blower assembly for vacuum cleaners
DE4141359A1 (de) * 1991-12-14 1993-06-17 Sel Alcatel Ag Geblaeserad fuer radialgeblaese

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB246659A (en) * 1925-01-21 1926-02-04 British Vacuum Cleaner And Eng Improvements in single or multi-stage fan exhausters
FR844912A (fr) * 1937-10-20 1939-08-04 Electrolux Ab Perfectionnements aux appareils pour le nettoyage par le vide du type à axe horizontal
US2731194A (en) * 1953-02-02 1956-01-17 Moss A Kent Vacuum cleaner blower
US2822122A (en) * 1955-05-06 1958-02-04 American Machine & Metals Vacuum cleaner motor and fan assembly
US4088424A (en) * 1977-05-23 1978-05-09 Ametek, Inc. Wet pick-up vacuum unit motor bearing air seal
EP0020814A1 (de) * 1979-06-06 1981-01-07 Ametek, Inc. Sauggerät für nasse Betriebsweise
GB2181185A (en) * 1985-10-01 1987-04-15 Rexair Inc Improved air blower assembly for vacuum cleaners
DE4141359A1 (de) * 1991-12-14 1993-06-17 Sel Alcatel Ag Geblaeserad fuer radialgeblaese

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1102370C (zh) * 1996-08-12 2003-03-05 三星光州电子株式会社 用于净化设备的电扇
ITTO20110209A1 (it) * 2011-03-09 2011-06-08 Fise Spa Estrattore perfezionato per separatore di liquidi di macchine aspira-liquidi.

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