US20240188781A1 - Cleaning device - Google Patents

Cleaning device Download PDF

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Publication number
US20240188781A1
US20240188781A1 US18/519,873 US202318519873A US2024188781A1 US 20240188781 A1 US20240188781 A1 US 20240188781A1 US 202318519873 A US202318519873 A US 202318519873A US 2024188781 A1 US2024188781 A1 US 2024188781A1
Authority
US
United States
Prior art keywords
brush
cleaning device
brush part
rotating
dust
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.)
Pending
Application number
US18/519,873
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English (en)
Inventor
Tomoaki Nakai
Yuki Nishizawa
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAKAI, TOMOAKI, NISHIZAWA, YUKI
Publication of US20240188781A1 publication Critical patent/US20240188781A1/en
Pending legal-status Critical Current

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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
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4063—Driving means; Transmission means therefor
    • A47L11/4069—Driving or transmission means for the cleaning tools
    • 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
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/24—Floor-sweeping machines, motor-driven
    • 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
    • A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
    • A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
    • A47L11/4036—Parts or details of the surface treating tools
    • A47L11/4041—Roll shaped surface treating tools
    • 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
    • A47L9/02—Nozzles
    • A47L9/04—Nozzles with driven brushes or agitators
    • A47L9/0461—Dust-loosening tools, e.g. agitators, brushes
    • A47L9/0466—Rotating tools
    • A47L9/0477—Rolls

Definitions

  • the present invention relates to a cleaning device that captures dust.
  • Electrostatic cleaning devices have been proposed that use static electricity as an approach of collecting dust on floor surfaces provide advantages of quietness and no exhaust air.
  • the cleaning device according to Japanese Patent Application Publication No. 2015-84993 has a first rotating member and a second rotating member rotatably disposed in a device main body.
  • a brush is provided to an outer circumferential surface of the first rotating member to be charged by friction when making sliding contact with a floor surface.
  • the second rotating member is charged by friction by a charging member inside the device.
  • dust becomes positively charged by friction, so that the dust adheres to the brush on which a negative charge is accumulated by the triboelectric charging.
  • the dust electrostatically adhered to the brush is ripped off by the second rotating member that is charged to a lower potential than the brush.
  • the dust electrostatically adhered to the second rotating member is scraped off by a blade into a container part.
  • the first rotating member and second rotating member are rotated by one driver.
  • the first rotating member is driven to rotate in a direction in which the main body of the cleaning device is advanced on the floor surface.
  • the cleaning device uses triboelectrification between dust on the floor surface and the brush to cause the dust to be charged and electrostatically attracted to the brush. Namely, the dust collection efficiency is dependent on the charged state of the brush.
  • the present invention provides an electrostatic cleaning device capable of collecting dust more stably.
  • the present invention is a cleaning device capturing dust on a cleaning target surface by static electricity, the cleaning device comprising:
  • the present invention is a cleaning device capturing dust on a cleaning target surface by static electricity, the cleaning device comprising:
  • the present invention can provide an electrostatic cleaning device capable of collecting dust more stably.
  • FIG. 1 is a cross-sectional view illustrating a schematic configuration of a cleaning device according to Embodiment 1;
  • FIG. 2 is a perspective view illustrating a schematic configuration of a cleaning device according to Embodiment 1;
  • FIG. 3 is a cross-sectional view illustrating a schematic configuration of a cleaning device according to Embodiment 2;
  • FIG. 4 is a cross-sectional view illustrating a schematic configuration of a cleaning device according to a modification of the embodiment
  • FIG. 5 is a perspective view illustrating a schematic configuration of a cleaning device according to a modification of the embodiment
  • FIG. 6 is a cross-sectional view illustrating a schematic configuration of a cleaning device according to a modification of the embodiment
  • FIG. 7 is a cross-sectional view illustrating a schematic configuration of a cleaning device according to a modification of the embodiment.
  • FIG. 8 is a cross-sectional view illustrating a schematic configuration of a cleaning device according to a modification of the embodiment.
  • FIG. 1 is a schematic diagram illustrating a cross section of an electrostatic cleaning device 1 according to Embodiment 1.
  • FIG. 2 is a perspective view illustrating the outer appearance of the cleaning device 1 .
  • the cleaning device 1 captures and collects dust on a cleaning target surface by static electricity, as a user grips the handle 11 of the cleaning device 1 and moves the cleaning device 1 on a floor surface 9 that is the cleaning target surface.
  • the cleaning device 1 includes a frame body 8 , a rotating brush 2 , a motor 25 , a rubbing member 3 , a blade 51 , a dust container 6 , a wheel 71 , and a wheel 72 .
  • the handle 11 is provided to the cleaning device 1 .
  • the handle 11 extends in a direction intersecting the vertical direction when the cleaning device 1 is placed on a horizontal plane, to allow the user to easily grip the handle 11 from behind the cleaning device 1 .
  • the direction to which the handle 11 extends from the cleaning device 1 shall be referred to as the rear side, and the opposite direction as the front side.
  • Arrow X in FIG. 1 and FIG. 2 indicates the direction from the rear side to the front side.
  • the rotating brush 2 is rotatably supported on the frame body 8 .
  • the rotating brush 2 includes a shaft part 21 rotatably supported on the frame body 8 , and a brush part 22 attached to the shaft part 21 to rotate integrally with the shaft part 21 .
  • the rotating brush 2 is rotated in the direction of arrow R by the motor 25 that is a driver.
  • the rotation direction R of the rotating brush 2 is counterclockwise in a cross-section perpendicular to the shaft part 21 of the rotating brush 2 as shown in FIG. 1 , the left side of the drawing being the front side.
  • the frame body 8 has an opening 82 in a bottom part that faces the floor surface 9 during the use of the cleaning device 1 .
  • a portion of the brush part 22 is exposed to the outside of the frame body 8 through the opening 82 .
  • the portion of the brush part 22 exposed through the opening 82 is configured to slide or rub against the floor surface 9 as the cleaning device 1 moves on the floor surface 9 during the use thereof.
  • Power supply to the motor 25 can be achieved by any known power supply means such as a battery or external power source and will not be described and illustrated here.
  • the drive force of the motor 25 can be transmitted to the rotating brush 2 by any known drive transmission means such as gears and will not be described and illustrated here.
  • the rubbing member 3 rubs the brush part 22 when the rotating brush 2 rotates.
  • the rubbing member 3 is disposed upstream of the opening 82 in the rotating direction of the rotating brush 2 .
  • the rubbing member 3 is disposed upstream of the position where the rotating brush 2 contacts and slides or rubs against the floor surface 9 in the rotating direction of the rotating brush 2 .
  • the blade 51 is a removal member that scrapes off dust adhered to the brush part 22 by making contact with the brush part 22 .
  • the blade 51 is disposed downstream of the position where the rotating brush 2 contacts and slides or rubs against the floor surface 9 in the rotating direction of the rotating brush 2 .
  • the blade 51 is positioned downstream of the opening 82 and upstream of the rubbing member 3 in the rotating direction of the rotating brush 2 .
  • the dust container 6 holds dust 10 scraped from the rotating brush 2 by the blade 51 .
  • the dust container 6 is attachable to and removable from the cleaning device 1 . The user can remove the dust container 6 from the cleaning device 1 and dispose of the collected dust 10 , and then attach the emptied dust container 6 to the cleaning device 1 .
  • the wheels 71 and 72 attached to the frame body 8 support the cleaning device 1 such as to allow the cleaning device 1 to move smoothly on the floor surface 9 and to maintain a constant amount of penetration of the rotating brush 2 to the floor surface 9 .
  • a polyethylene terephthalate (hereinafter PET) material with a 10D pile fineness, 5 mm pile length, and 30 kF/inch 2 density was used for the brush part 22 . Why this material was selected will be described later.
  • the outside diameter of the rotating brush 2 was 30 mm, and the shaft rotation speed was 50 rpm.
  • the brush part 22 thus configured such that the rotating brush 2 is able to electrostatically attract the dust on the floor surface 9 . Relatively large clumps on the floor surface 9 are physically swept up by the rotating force of the brush part 22 and can be collected in the dust container 6 .
  • the blade 51 an elastic polyurethane resin material was used.
  • the blade 51 was fixed to a blade support plate 52 such as to make contact with the rotating brush 2 with a pressure that allows the blade to scrape off dust adhered to the surface of the rotating brush 2 .
  • the blade support plate 52 is fixed to the frame body or elsewhere of the main body of the cleaning device 1 .
  • a brush with a 10D pile fineness, 3 mm pile length, and 50 kF/inch 2 density was used for the rubbing member 3 .
  • Such a brush increases the time and area of contact with the rotating brush 2 and can raise the amount of charge.
  • the rubbing member 3 is not limited to a brush shape. Components in various shapes such as plates or rollers may be used as the rubbing member.
  • the material for the rubbing member 3 and the dust to be captured by the cleaning device 1 are positioned on the same side relative to the material that forms the brush part 22 .
  • the material for the brush part 22 is closer to the negative end of the triboelectric series than the dust.
  • the work function of the material that forms the rubbing member 3 is smaller than the work function of the material that forms the brush part 22 .
  • the brush part 22 and rubbing member 3 are made of materials respectively closer to the negative end and the positive end of the triboelectric series. Therefore, the rubbing member 3 and the brush part 22 sliding or rubbing against each other produce a negative charge on the brush part 22 .
  • the brush part 22 facing the floor surface 9 through the opening 82 is negatively charged, the brush part 22 attracts positively charged dust on the floor surface 9 even though there is no rubbing (friction contact) between the brush part 22 and the floor surface 9 or dust. Accordingly, dust that does not enough rubbed by the brush part 22 due to the shape or contour of the floor surface 9 can also be captured.
  • the brush part 22 is configured to protrude from the opening 82 to the extent that the brush part 22 slides or rubs against the floor surface 9 as the cleaning device 1 moves on the floor surface 9 . Therefore, as the cleaning device 1 travels, the brush part 22 rubs the floor surface 9 or the dust on the floor surface. The brush part 22 sliding or rubbing against the dust on the floor surface 9 produces a positive charge on the dust. The brush part 22 is negatively charged by being rubbed by the rubbing member 3 . Thus, the opposite polarity charges of the brush part 22 and dust enable efficient electrostatic attraction of the dust on the floor surface 9 to the brush part 22 .
  • the material for the brush part 22 should preferably have durability and wear resistance in addition to the ability to electrostatically attract the dust on the floor surface 9 .
  • Preferable materials having such properties and satisfying the condition of the triboelectric series described above include polyester, acrylic, polypropylene, PET, and polyurethane. In Embodiment 1, PET was used as the material for the brush part 22 .
  • the material for the rubbing member 3 should preferably be able to provide a negative charge on the brush part 22 by sliding or rubbing against the brush part 22 .
  • Preferable materials having such ability and satisfying the conditions of the triboelectric series and the work function described above include glass, wool, nylon, and rayon. In Embodiment 1, nylon was used as the material for the rubbing member 3 .
  • Dust on the floor surface 9 is mostly closer to the positive end of the triboelectric series. Therefore, with the brush part 22 being negatively charged by the rubbing member 3 , even when the brush part 22 does not fully come into contact with the dust due to asperities on the floor surface 9 , the dust on the floor surface 9 can be efficiently collected by the electrostatic attractive force acting between the brush part 22 and the dust.
  • the work function of the material that forms the rubbing member 3 being smaller than the work function of the material that forms the brush part 22 enables efficient negative charging of the brush part 22 by rubbing between the rubbing member 3 and the brush part 22 .
  • a measurement method to determine the triboelectric series will be described. Which of the given two members is relatively positive or negative in the triboelectric series can be determined by examining the charge polarity on the surface of each member when the two members are rubbed together.
  • Comparative Example 1 differs from Embodiment 1 in that the material for the rubbing member 3 was changed from nylon to perfluoroalkoxy alkane (PFA). Therefore, the rubbing member 3 , brush part 22 , and dust in Comparative Example 1 have the following relationships in the triboelectric series.
  • the collection rate was lower in Comparative Example 1 than in Embodiment 1. This is assumed to be because of the following: In Comparative Example 1, the PFA rubbing member 3 is closer to the negative end of the triboelectric series than the PET brush part 22 , so that the surface of the brush part 22 is positively charged when the brush part 22 slides or rubs against the rubbing member 3 . Since the dust that is mainly flour on the floor surface 9 is positively charged, it is assumed that the dust electrostatically repelled the brush part 22 and hardly adhered to the brush part 22 , resulting in the lower collection rate.
  • Embodiment 2 differs from Embodiment 1 in the configuration for removing the dust that has adhered to the rotating brush 2 .
  • Other configurations are the same as those of Embodiment 1.
  • the components common to Embodiment 1 will be given the same reference numerals and will not be described again.
  • FIG. 3 is a schematic diagram illustrating a cross section of the cleaning device 1 according to Embodiment 2.
  • a collection roller 41 is provided as a collection member for collecting the dust that has adhered to the brush part 22 .
  • the collection roller 41 is in contact with the brush part 22 downstream of the opening 82 and upstream of the rubbing member 3 in the rotating direction of the rotating brush 2 .
  • the collection roller 41 is a rotating member rotatably supported on the frame body 8 .
  • the collection roller 41 rotates in the direction of arrow S by the drive force of the motor 25 .
  • the rotation direction S of the collection roller 41 is counterclockwise in a cross-section perpendicular to the shaft part 21 of the rotating brush 2 as shown in FIG. 3 , the left side of the drawing being the front side.
  • the drive force of the motor 25 is transmitted also to the rotating brush 2 as in Embodiment 1.
  • the blade 51 makes contact with the collection roller 41 and scrapes off the dust that has adhered to the surface of the collection roller 41 .
  • the dust scraped from the surface of the collection roller 41 by the blade 51 is held in the dust container 6 .
  • the dust on the floor surface 9 after being captured by the brush part 22 , is collected by the collection roller 41 from the brush part 22 and scraped off by the blade 51 .
  • the collected dust 10 accumulates in the dust container 6 .
  • the collection roller 41 is composed of a metal core covered by a surface layer member 42 . Iron, aluminum, or SUS may be used as the material for the metal core. A 300 ⁇ m thick coat of perfluoroalkoxy alkane (PFA) was used as the surface layer member 42 here. Why this material was selected will be described later.
  • the outside diameter of the collection roller 41 was 24 mm, and the shaft rotation speed was 50 rpm.
  • the material for the surface layer member 42 of the collection roller 41 and the dust have an opposite polarity charge relative to the brush part 22 in the triboelectric series.
  • the material for the brush part 22 is closer to the negative end of the triboelectric series than the dust as in Embodiment 1.
  • the material for the rubbing member 3 and the dust are positioned on the same side relative to the material for the brush part 22 in the triboelectric series.
  • the work function of the material that forms the surface layer member 42 of the collection roller 41 is larger than the work function of the material that forms the brush part 22 .
  • the material used for the surface layer member 42 forms a negative charge on the brush part 22 by sliding or rubbing against the brush part 22 . Namely, a material that is closer to the negative end of the triboelectric series than the material for the brush part 22 is used for the surface layer member 42 . Considering that the blade 51 is contacted to the surface layer member 42 , the material for the surface layer member 42 should preferably have wear resistance and good sliding properties.
  • Preferable materials having such properties and satisfying the condition of the triboelectric series described above include polytetrafluoroethylene (PTFE), silicone, polychlorotrifluoroethylene (PCTFE, CTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), PFA, tetrafluoroethylene-hexafluoropropylene copolymer (FEP), ethylene-tetrafluoroethylene copolymer (ETFE), ethylene-chlorotrifluoroethylene copolymer (ECTFE), and other fluoropolymers.
  • PFA was used as the material for the surface layer member 42 .
  • the positively charged dust adhered on the brush part 22 can be electrostatically attracted to the collection roller 41 .
  • the blade 51 an elastic polyurethane resin material was used.
  • the blade 51 was secured using a blade support plate 52 to achieve a desired contact pressure. The blade can thus scrape off the dust adhered on the surface of the collection roller 41 , while causing minimal wear or damage on the surface layer member 42 in making contact therewith.
  • the material for the rubbing member 3 in Embodiment 2 was changed from nylon to PFA in Comparative Example 2.
  • Comparative Example 3 for the evaluation, the material for the rubbing member 3 in Embodiment 2 was changed from nylon to PFA, and the surface layer member 42 was removed so that the metal core made of SUS of the collection roller 41 makes contact with the brush part 22 .
  • Comparative Example 4 for the evaluation, the surface layer member 42 was removed so that the metal core made of SUS of the collection roller 41 makes contact with the brush part 22 .
  • the collection rate was lower in Comparative Examples 2 to 4 than in Embodiment 2. This is assumed to be because of the following: In Comparative Example 2, the material that forms the rubbing member 3 was changed to PFA that is closer to the negative end of the triboelectric series than the material that forms the brush part 22 . Therefore, the surface of the brush part 22 is positively charged when the brush part 22 slides or rubs against the rubbing member 3 . Since the dust on the floor surface 9 is mostly positively charged, the dust that failed to come into friction contact with the brush part 22 and to be rubbed by the brush part 22 is not likely to be attracted electrostatically to the positively charged brush part 22 . This is considered to be the reason why the collection rate was lower in Comparative Example 2 than in Embodiment 2.
  • the surface layer member 42 was removed from the configuration of Comparative Example 2 so that the metal core made of SUS of the collection roller 41 makes contact with the brush part 22 .
  • SUS is closer to the positive end of the triboelectric series than PET that is the material for the brush part 22 , so that the brush part 22 is negatively charged when the brush part 22 slides or rubs against the collection roller 41 .
  • This allows the positively charged dust on the brush part 22 to stay more easily on the negatively charged brush part 22 . Therefore, the dust on the brush part 22 is less likely to migrate onto the collection roller 41 when making contact with the collection roller 41 .
  • the rotating brush 2 rotates, the dust on the floor surface 9 is collected by attraction on the brush part 22 .
  • Comparative Example 4 the same material as in Embodiment 2 was used for the rubbing member 3 , but the material for the surface layer member 42 was changed to SUS. Therefore, it is assumed that the dust on the brush part 22 could hardly migrate to the surface layer member 42 , resulting in the collection rate lower than that of Embodiment 2.
  • a contacted part 81 may be provided to a part of the frame body 8 of the cleaning device 1 as illustrated in FIG. 4 for the brush part 22 to make contact with.
  • the contacted part 81 may be made of one of the materials (such as nylon) mentioned as preferable for the rubbing member 3 in the embodiments described above.
  • FIG. 4 shows a cross section similar to FIG. 1 of a cleaning device 1 that has the contacted part 81 , in particular the vicinity of the rotating brush 2 .
  • a part of the frame body functions as the rubbing member in the embodiments described above.
  • the contacted part 81 is provided upstream of the opening 82 where the rotating brush 2 is exposed to the floor surface 9 in the rotating direction of the rotating brush 2 (direction indicated by arrow R).
  • the brush part 22 can be negatively charged by the contacted part 81 and the brush part 22 sliding or rubbing against each other.
  • FIG. 5 is a perspective view illustrating a schematic configuration of the vacuum cleaner 100 .
  • the vacuum cleaner 100 is able to remove dust on the floor surface by using a flow of air, as well as to remove dust adhered on the brush part 22 .
  • the cleaner can exhibit enhanced performance for removing dust on a floor.
  • FIG. 6 illustrates an alternative configuration that uses a brush belt 20 instead of the rotating brush 2 .
  • the brush belt 20 is composed of an endless belt 23 rotatably passed around tension rollers 73 and 74 , and a brush part 22 on the surface of the belt 23 .
  • FIG. 6 shows a cross section similar to FIG. 1 of a cleaning device 1 that has the brush belt 20 .
  • the brush part 22 rotates integrally with the belt 23 .
  • the brush belt 20 may be rotated by the drive force of the motor 25 similarly to Embodiment 1.
  • the drive source for rotating the rotating brush 2 , collection roller 41 , and brush belt 20 is not limited to the motor 25 .
  • the rotating brush 2 may be rotated using a transmission member 24 such as a gear, which may be used to transmit the rotary force of the wheel 71 or wheel 72 to the rotating brush 2 when the cleaning device 1 moves, as illustrated in FIG. 7 .
  • FIG. 7 shows a cross section similar to FIG. 1 of a cleaning device 1 that has such a transmission member 24 .
  • the collection roller 41 and brush belt 20 may be rotated by transmitting the rotary force of the wheel 71 or wheel 72 .
  • the rubbing member may be configured by a rotating member 30 rotatably supported on the frame body that forms the device main body of the cleaning device 1 as illustrated in FIG. 8 .
  • the rotating member 30 may have a surface layer made of a material that satisfies the conditions for the material that forms the rubbing member 3 described above.
  • a second brush part 31 may be provided to an outer circumferential surface of the rotating member 30 to make contact with the brush part 22 (first brush part) of the rotating brush 2 .
  • the second brush part 31 may be made of a material that satisfies conditions similar to those for the material that forms the rubbing member 3 described above.
  • a brush may be provided to a surface of the rubbing member 3 of Embodiment 1 illustrated in FIG. 1 such as to be able to rub the brush part 22 of the rotating brush 2 .
  • This brush may be made of a material that satisfies conditions similar to those for the material that forms the rubbing member 3 described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles For Electric Vacuum Cleaners (AREA)
  • Cleaning In General (AREA)
US18/519,873 2022-12-13 2023-11-27 Cleaning device Pending US20240188781A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-198355 2022-12-13
JP2022198355A JP2024084210A (ja) 2022-12-13 2022-12-13 清掃装置

Publications (1)

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US20240188781A1 true US20240188781A1 (en) 2024-06-13

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US18/519,873 Pending US20240188781A1 (en) 2022-12-13 2023-11-27 Cleaning device

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JP (1) JP2024084210A (https=)

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