WO2010070258A1 - Ensemble filtre - Google Patents

Ensemble filtre Download PDF

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Publication number
WO2010070258A1
WO2010070258A1 PCT/GB2009/001234 GB2009001234W WO2010070258A1 WO 2010070258 A1 WO2010070258 A1 WO 2010070258A1 GB 2009001234 W GB2009001234 W GB 2009001234W WO 2010070258 A1 WO2010070258 A1 WO 2010070258A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter assembly
sheet
zig
vertices
filter
Prior art date
Application number
PCT/GB2009/001234
Other languages
English (en)
Inventor
Christopher Luke Butcher
Michael Paul Barton
Keith David Rick
Martin Stuart Denning
Original Assignee
Dyson Technology Limited
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 Dyson Technology Limited filed Critical Dyson Technology Limited
Publication of WO2010070258A1 publication Critical patent/WO2010070258A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B01D46/522—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material with specific folds, e.g. having different lengths
    • 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
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • 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
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/12—Dry filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
    • B01D29/07—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported with corrugated, folded or wound filtering sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material

Definitions

  • the present invention relates to a filter assembly for a cleaning appliance such as a vacuum cleaner.
  • Vacuum cleaners are designed to separate dirt and dust from an airflow.
  • an airflow generator for example, a motor and fan unit
  • the airflow then passes through a form of separating apparatus to remove dirt and dust from the airflow.
  • Some vacuum cleaners make use of a porous bag through which the dirty air is sucked so that the dirt and dust is retained in the bag whilst cleaned air is exhausted to the atmosphere.
  • cyclonic separators are used to separate dirt and dust from the airflow.
  • vacuum cleaners include a fine filter in an airflow path between the separating apparatus and the airflow generator. This filter is commonly known as a pre-motor filter and is used to extract fine dirt and dust particles remaining in the airflow after it has passed through the separating apparatus.
  • the pre-motor filter will occasionally need to be replaced or cleaned in order to maintain the performance of the vacuum cleaner.
  • filters it is common for such filters to be removable from a vacuum cleaner.
  • a filter downstream of the airflow generator This is known as a post-motor filter, and is typically employed to filter carbon dust which may be generated by brushes on the motor, as well as allergens and any microscopic particles of dirt and dust remaining in the airflow.
  • the post-motor filter may need to be cleaned or replaced.
  • the post-motor filter will need such attention much less frequently than does the pre-motor filter.
  • the present invention provides a cleaning appliance filter assembly comprising a sheet of filter medium, the sheet being folded in a fold pattern so as to form a doubly corrugated structure comprising a plurality of successive peaks and troughs, each peak and trough having a plurality of undulations along it.
  • a doubly-corrugated, or multiply-corrugated, structure for the filter medium permits a filter of greater effective surface area to be achieved than was possible hitherto.
  • Such a filter has an increased capacity for dirt and dust.
  • the fold pattern comprises a plurality of rows of zig-zag lines having alternating vertices, and straight lines running transverse or orthogonal to the rows of zig-zag lines, with the straight lines passing through the vertices.
  • This is a pattern that is straightforward to produce and allows for a variety of filter shapes to be made.
  • the zig-zag lines may be parallel to each other, with the pattern comprising a matrix of tessellated parallelograms.
  • the zig-zag lines may be of two different types, having vertices of different angles, with the lines of the different types alternating across the sheet of filter medium.
  • a matrix of tessellated trapezoids may be formed in this way.
  • Such a pattern allows for a variety of curved surfaces, such as a dome, part- spherical, hemispherical and other three-dimensional surfaces, to be made.
  • the present invention provides a domed cleaning appliance filter assembly comprising a sheet of filter medium folded along a fold pattern comprising a plurality of rows of zig-zag lines having alternating vertices and plurality of rows of straight lines running transverse to the rows of zig-zag lines and passing through the vertices, the zigzag lines comprise alternating lines of a first type and a second type, the first type of zig-zag line having vertices of a first angle and the second type of zig-zag line having vertices of a second angle different from the first angle.
  • the pattern may be impressed on the filter sheet in a plurality of orientations, so that an even greater range of filter shapes may be made.
  • the sheet may comprise a plurality of sections each folded according to the fold pattern, with each section being oriented transversely, preferably at substantially 90°, to its neighbouring section.
  • a housing is provided so as to maintain the folded sheet in its required shape and to assist a user in removing and replacing the filter assembly in a cleaning appliance, such as a vacuum cleaner.
  • the sheet comprises a plurality of sections
  • the housing may comprise a plurality of frames, with each section being located within a respective frame.
  • Each section may comprise opposing end portions compressed by different amounts so that the folded sheet adopts the required shape.
  • the filter assembly may comprise a plurality of sheets each folded along the fold pattern.
  • a housing may be provided so as to maintain the folded sheets in their required shape and to assist a user in removing and replacing the filter assembly in a cleaning appliance.
  • the sheet comprises a plurality of sheets
  • the housing may comprise a plurality of frames, with each sheet being located within a respective frame. Each sheet may comprise opposing end portions compressed by different amounts so that the folded sheets adopt the required shape.
  • the sheet or sheets may be held in the housing by adhesive or may be clamped into the housing so as to be releasable from the housing for cleaning or replacement.
  • One or more apertures may be provided so that the filter medium is not too densely packed when the filter sheet has been folded and compressed.
  • Spacers may be provided to maintain a predetermined distance between the peaks and troughs and successive undulations.
  • the sheet may be folded so that flat sections are interspersed between successive peaks and troughs.
  • the present invention provides a cleaning appliance comprising a filter assembly as aforementioned.
  • the cleaning appliance preferably comprises a motor of generating a fluid flow, and the filter assembly is preferably located downstream from the motor.
  • the motor is preferably located within a rolling assembly of the cleaning appliance, which rolling assembly is preferably substantially spherical.
  • the domed or part-spherical shape of the filter assembly allows the filter assembly to readily incorporated within the rolling assembly while maximising the space available for other components of the rolling assembly, such as the motor, an impeller driven by the motor and a second filter assembly located upstream from the motor.
  • the present invention provides a method of manufacturing a cleaning appliance filter assembly comprising the steps of impressing a fold pattern onto a sheet of a filter medium, and folding the sheet according to the pattern so as to form a doubly corrugated structure comprising a plurality of successive peaks and troughs, each peak and trough having a plurality of undulations along it.
  • the present invention provides a method of manufacturing a domed cleaning appliance filter assembly comprising the steps of impressing a fold pattern onto a sheet of filter medium, folding the sheet according to the fold pattern, and compressing the folded sheet to form a curved shape, the fold pattern comprising a plurality of rows of zig-zag lines having alternating vertices and plurality of rows of straight lines running transverse to the rows of zig-zag lines and passing through the vertices, the zig-zag lines comprise alternating lines of a first type and a second type, the first type of zig-zag line having vertices of a first angle and the second type of zigzag line having vertices of a second angle different from the first angle.
  • the method also comprises the step of trimming the folded sheet.
  • Figure 1 is a schematic plan view of a sheet of filter medium incorporating a first fold pattern
  • Figure 2 shows the sheet of Figure 1 in a part-folded state
  • Figure 3 is a perspective view of a filter assembly including the sheet of Figures 1 and 2;
  • Figure 4 is a schematic plan view of a sheet of filter medium incorporating an alternative fold pattern
  • Figure 5 is a perspective view of a filter assembly including the sheet of Figure 4;
  • Figure 6 is a perspective view of a sheet of filter medium folded according to the pattern of Figure 4;
  • Figure 7 is a perspective view of the sheet of Figure 6 in a folded and compressed state
  • Figure 8 is a perspective view of a filter assembly including the sheet of Figures 6 and
  • Figure 9 is a front perspective view of a vacuum cleaner incorporating the filter assembly of Figure 8.
  • Figure 10 is a schematic, sectional view of part of the vacuum cleaner of Figure 9;
  • Figure 11a is a side schematic view of part of machinery arranged to manufacture the filter assembly
  • Figure l ib is a side schematic view of another part of machinery arranged to manufacture the filter assembly
  • Figure l ie is a plan schematic view of another part of machinery arranged to manufacture the filter assembly
  • Figure 1 Id is a side schematic view showing another stage of the manufacturing process of the filter assembly
  • Figure l ie is a side schematic view of the final stage of the manufacturing process of the filter assembly.
  • Figure 12 is a perspective view of an alternative sheet of filter medium.
  • a sheet of filter medium is shown and indicated generally by the reference numeral 1.
  • a pattern 2 of folds has been impressed on the sheet 1 by a method which is described further below.
  • the pattern 2 comprises a plurality of substantially identical parallelograms 3 or other multi-sided geometric forms, tessellated to cover most of the filter medium 1 with no gaps.
  • the pattern 2 of parallelograms 3 is made up of a plurality of substantially parallel rows of zig-zag lines 4.
  • Each of the zigzag lines 4 comprises an undulating line having a plurality of alternating vertices.
  • the vertices are substantially equal.
  • the pattern 2 of parallelograms 3 also comprises a plurality of substantially parallel straight lines 5.
  • the straight lines 5 are substantially orthogonal to the rows of zig-zag lines 4 and are disposed to pass through the vertices of the zig-zag lines.
  • Figure 2 shows the sheet 1 in the process of being folded.
  • the folds themselves comprise alternating mountain folds and valley folds.
  • a mountain fold indicates a fold angle of greater than 180° about the fold line as measured on the upper surface of the sheet 1
  • a valley fold indicates a fold angle of less than 180° about the fold line as measured on the upper surface of the sheet.
  • the folding direction changes at every point where the line crosses or meets another.
  • Each zig-zag line 4 comprises one mountain fold or valley fold, with its neighbouring zig-zag lines being of the opposite orientation.
  • the sheet 1 of filter medium As the sheet 1 of filter medium is folded and compressed, it forms a plurality of successive v- shaped reliefs, as is shown in Figure 3.
  • the sheet undulates in two orthogonal planes: between the zig-zag lines 4 so as to form successive peaks and troughs; and along each peak and trough. Therefore, the surface of the sheet can be said to be doubly corrugated.
  • the sheet 1 of filter medium is shown here in a filter assembly 6, which comprises the folded sheet held in a housing 7.
  • the housing 7 comprises a frame which holds the sheet 1 in its folded configuration.
  • the filter assembly 6 may be located in a cleaning appliance in order to filter particles from a fluid flow. In the example of the filter assembly 6 being employed in a vacuum cleaner, the filter assembly may be located either upstream of a motor that generates suction, or downstream of it.
  • Figure 4 shows schematically the sheet 1 of filter medium having an alternative fold pattern 8 impressed into it.
  • the pattern 8 comprises rows of zig-zag lines of a first type 9, alternating with rows of zig-zag lines of a second type 10.
  • Each of the first type 9 of zig-zag lines comprises an undulating line having a plurality of alternating substantially similar vertices 1 1.
  • Each of the vertices 1 1 defines a first angle 12.
  • Each of the second type 10 of zig-zag lines comprises an undulating line having a plurality of alternating substantially similar vertices 13.
  • Each of the vertices 13 defines a second angle 14.
  • the first angle 12 and the second angle 14 are not equal, and so the alternating rows of zig-zag lines of the first type 9 and the second type 10 are not parallel.
  • the difference between the first type 9 and second type 10 of zig-zag lines has been exaggerated in this drawing for illustrative purposes.
  • the pattern 8 also comprises a plurality of substantially parallel straight lines 15.
  • the straight lines 15 are substantially orthogonal to the rows of zig-zag lines of the first type 9 and second type 10 and are disposed to pass through the vertices 1 1 , 13 of the zig-zag lines.
  • the fold pattern 8 comprises a plurality of trapezoids 16, tessellated to cover most of the filter medium 1 with no gaps.
  • each straight line 15 of the pattern 8 the folding direction changes at every point where the line crosses or meets another.
  • Each zig-zag line 9 comprises one mountain fold or valley fold, with its neighbouring zig-zag lines 10 comprising a fold of the opposite orientation.
  • the sheet 1 incorporating the fold pattern 8 When the sheet 1 incorporating the fold pattern 8 is folded and compressed, it forms a doubly corrugated structure as before, with successive peaks and troughs, each peak and trough having undulations running along it.
  • the nature of the fold pattern 8 means that the sheet also forms a curve.
  • the plane of curvature is parallel to the direction of the parallel straight lines 15.
  • Figure 5 illustrates a filter assembly 17 incorporating a plurality of square sheets 1' of a filter medium folded according to the fold pattern 8.
  • Each sheet 1' has been folded and compressed to form a filter segment 18.
  • One end portion of each filter segment 18 has been compressed more than the opposite end portion, so that the filter segment also curves in a plane transverse to the plane of curvature of the folded sheet.
  • each filter segment 18 has a curvature defining part of a sphere.
  • the filter segments 18 are mounted in a housing 19, which comprises a plurality of frames 19'.
  • Each frame 19' houses a filter segment 18.
  • the resultant filter assembly 17 is hemispherical in shape. One way in which such a filter assembly 17 may be employed will be discussed later in this specification.
  • Figure 6 shows a large sheet 20 of a filter medium that has been loosely folded according to a fold pattern.
  • the sheet 20 is square in shape and has a square aperture 21 at its centre. If one imagines a line running from each corner of the aperture 21 to its corresponding corner of the sheet 20, then the sheet comprises four sections 20a, 20b, 20c, 2Od, each of which is a trapezoid oriented at 90° to each of its neighbours.
  • Each of the sections 20a, 20b, 20c, 2Od has been impressed with the aforedescribed fold pattern 8 comprising straight lines 15 substantially orthogonal to alternating rows of zig-zag lines of a first type 9 and second type 10.
  • the fold pattern 8 has been oriented such that the straight parallel lines are substantially perpendicular to the parallel sides of the trapezoid - that is to say, the straight lines 15 are substantially perpendicular to the long edges of the sheet 20.
  • the fold pattern 8 of each section 20a, 20b, 20c 2Od is oriented at substantially 90° to the folding pattern of its neighbouring sections. It is as though the section 20a, with its fold pattern 8, has been rotationally translated by a right-angle three times in succession.
  • the nature of the fold pattern 8 produces a curvature of each of the sections 20a, 20b, 20c, 2Od, which is not particularly noticeable in this drawing because the folded sheet has not been compressed.
  • Figure 7 shows the folded sheet 20 in a compressed state.
  • the sheet 20 automatically assumes a part-spherical shape, by virtue of the fold pattern 8 and the compression of the sheet.
  • the aperture 21 shrinks such that the sections 20a, 20b, 20c, 2Od come together at the centre of the sheet.
  • a filter assembly 22 incorporating the folded and compressed sheet 20 is shown in
  • Figure 8 It is similar in appearance to the filter assembly of Figure 5, but it comprises the single sheet 20 held in a housing 23.
  • the housing 23 holds the sheet 20 of filter medium in the required predetermined shape - in this case, a hemisphere - as well as enabling a user to remove and replace the filter assembly in a cleaning appliance, such as the vacuum cleaner of Figure 9.
  • Figure 9 shows a vacuum cleaner 24 comprising a main body 25, a user-operable handle 26 and a large roller 27 for rolling the cleaner 24 along a floor surface.
  • a cleaner head 28 is pivotably mounted on the lower end of the main body 25 and a dirty air inlet 29 is provided in the underside of the cleaner head facing the floor surface.
  • the handle 26 can be manipulated by a user to manoeuvre the vacuum cleaner 24 across a floor surface.
  • Separating apparatus 31 is releasably held on the main body 25.
  • the separating apparatus 31 comprises a separator 32 and a collecting chamber 33.
  • the interior of the separating apparatus 31 is in communication with the dirty air inlet 29 through ducting 30 on the main body 25.
  • the separating apparatus 31 can be removed from the main body 25 for emptying and for maintenance.
  • a motor and fan unit 34 located inside the roller 27 draws dirty air into the vacuum cleaner 24 via the dirty air inlet 29.
  • the dirty air is carried to the separating apparatus 31 via the ducting 30.
  • the separator 32 comprises an upstream cyclone 35 in the collecting chamber 33.
  • An air inlet is arranged tangentially to the upstream cyclone 35 so that the incoming air is encouraged to follow a helical path around the interior of the upstream cyclone.
  • the upstream cyclone 35 separates particles of dirt and dust from the airflow. The separated dirt and dust falls into the collecting chamber 33.
  • a shroud 36 is located in the upstream cyclone 35 and comprises a cylindrical wall having a plurality of through-holes.
  • the shroud 36 provides a communication path between the upstream cyclone 35 and a downstream cyclone assembly, which comprises a plurality of downstream cyclones 37 arranged in parallel.
  • Each of the downstream cyclones 37 has a diameter smaller than that of the upstream cyclone 35. Therefore, the downstream cyclones 37 are able to separate smaller particles of dirt and dust from the partially-cleaned airflow than the upstream cyclone 35. Separated dirt and dust exits the downstream cyclones 37 and passes into the collecting chamber 33.
  • Cleaned air then exits the separating apparatus 31 and enters a duct 38.
  • the cleaned air then passes from the duct 38 to a pre-motor filter 39 inside the roller, as is shown in
  • the direction of airflow is indicated by the arrows.
  • the pre-motor filter 39 serves to trap any fine dust or microscopic particles which have not been separated by the two cyclonic separation stages 35, 37.
  • This unit 34 accommodates a fan impeller which is driven by a motor to generate the suction airflow.
  • the outlet of the fan and motor unit 34 communicates with the filter assembly 22.
  • the filter assembly 22 serves as a post-motor filter, to trap any remaining particles in the airflow, as well as carbon particles from the motor. Air then exits the filter assembly 22 and is exhausted from the vacuum cleaner 24 through outlet ports 40 in the roller.
  • the filter assembly 17 could be used instead of the filter assembly 22.
  • filter assemblies 6, 17, 22, with their sheets 1, 20 of filter material comprising a multitude of pleats have large effective surface areas - much more so than if a simple unfolded sheet of filter medium were employed, or even if the sheet were pleated simply, like a concertina.
  • Such filter assemblies 6, 17, 22 have a large capacity for dirt and dust, and so will have a substantially increased lifetime when compared with conventional filter assemblies. It is thought that the undulating nature of the folded sheets 1 , 20 may also have a beneficial effect in damping sound generated by the motor in use.
  • the hemispherical filter assemblies 17, 22 also have the benefit of corresponding to the interior contours of the roller 27. Previously, it had been difficult to find room for filters inside the roller; the constraints of the roller meant that only relatively small filters could be placed here.
  • the invention permits filters with a large capacity for dirt and dust to be accommodated inside the roller.
  • a method of forming a filter assembly of the invention will now be described, with particular reference to the filter assembly 22.
  • Figures 1 Ia to l ie illustrate the proposed method.
  • the sheet 20 of filter medium is drawn between a pair of cylindrical rollers 41a, 41b.
  • the rollers 41a, 41b have the fold pattern 8 formed on their surfaces in relief.
  • One roller 41a may have part of the pattern 8 formed on it, such as the zig-zag lines 9, 10.
  • the remainder of the pattern 8, for example the straight lines 15 may be formed on the other roller 41b.
  • the fold pattern 8 is impressed on it, creating lines of weakness to assist in the folding of the sheet.
  • One or more additional pairs of rollers may be provided depending on the complexity of the fold pattern 8.
  • the sheet 20 then passes between a pair of pleating drums 42a, 42b such as are shown schematically in Figure l ib.
  • the pleating drums 42a, 42b are driven in synchronism with the rollers 41a, 41b and comprise a plurality of blades (not shown) which are urged against the lines of the fold pattern 8.
  • the upper drum 42a presses down against the sheet 20 and so forms valley folds in its upper surface.
  • the lower drum pushes up against the sheet 20 and forms mountain folds in its upper surface.
  • the resulting folded sheet 20 then needs to be compressed appropriately; the next stage of the process is shown schematically in the plan view of Figure 1 Ic.
  • the folded sheet 20 of filter medium is placed in a collapsing jig 43.
  • the collapsing jig 43 applies pressure to the four corners of the sheet 20, as is shown by the arrows in this drawing. This causes the folds to come closer together, forming a more compressed filter structure.
  • the jig 43 may also be arranged to apply pressure from above or below in order to assist the sheet 20 in forming the required curvature.
  • the folded and compressed sheet 20 is then trimmed by blades 44, such as are shown in Figure 1 Id.
  • the blades 44 trim off excess material from the sheet 20.
  • the sheet 20 is potted into the housing 23, as shown in Figure 1 Ie.
  • the edges of the sheet 20 are held in the housing 23 by means of adhesive 45.
  • the sheet 20 may be held in the housing by means of a user-operable clamp, so that the user may remove the filter medium from the housing for replacement or cleaning.
  • FIG. 12 shows the filter sheet 20 of Figure 6, but with spacers 46 on each trapezoid. Only some spacers 46 are shown in this drawing for clarity. The spacers 46 ensure that, when the sheet 20 is folded and compressed, each trapezoid is separated from its neighbour by a predetermined distance. The final pleated surface of the filter sheet 20 will undulate uniformly.
  • the spacers 46 may be formed by glass beads attached to a surface of the filter sheet 20. Typically, the beads will be very small so as not to affect detrimentally the effective surface area of the sheet 20. Alternatively, the spacers 46 may be formed by small blobs of adhesive or molten plastic applied to the surface of the sheet 20 and left to cool. As a further alternative, the spacers 46 may be formed by embossing the surface of the sheet 20 itself. This has the advantage of not reducing the effective surface area of the sheet 20.
  • the filter medium may comprise paper, preferably loaded with glass fibres, Polytetrafluoroethylene (PTFE) or other fluoropolymer, fiberglass, foam or stiffened cotton.
  • PTFE Polytetrafluoroethylene
  • the invention has been described in relation to a filter assembly having a flat or part- spherical shape, but the filter may be made in any one of a variety of shapes or curves including barrel shapes, cubes or other polyhedrons, cones or cylinders.
  • the contours of the folded filter need not be uniform. Different contours may be achieved by varying the distances between folds, the angles of the vertices and the extent of compression of the filter.
  • the sheet may have different fold patterns on different portions of it.
  • the filter assembly 22 was described as being located downstream of the fan and motor unit 34. Any one of the filter assemblies 6, 17, 22 could be located downstream of the fan and motor unit 34, upstream of it, or both upstream and downstream.
  • the cleaning appliance need not be an upright vacuum cleaner.
  • the invention is applicable to other types of vacuum cleaner, for example, cylinder machines, stick- vacuums or hand-held cleaners. Further, the present invention is applicable to other types of cleaning appliances, for example, a wet and dry machine or a carpet shampooer.
  • the fold pattern may be scored onto the sheet, or by punching the fold pattern onto it.
  • laser etching, or etching involving a photo-resist stage may be employed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)

Abstract

L'invention concerne des pièces de renforcement internes (10) et leurs procédés d'implantation. Une pièce de renforcement peut être implantée sur un côté d'une articulation, ou une paire de pièces de renforcement peut être implantée sur chaque côté opposé d'une articulation. Chaque pièce de renforcement supporte l'articulation au-dessus d'au moins une partie de sa plage de mouvement. Une détraction peut être fournie, ou une répartition des charges peut être accomplie sans détraction. Une rotation axiale relative des os raccordés par la pièce de renforcement peut être permise. Un ou plusieurs éléments élastiques peuvent être disposés dans la pièce de renforcement.
PCT/GB2009/001234 2008-12-19 2009-05-19 Ensemble filtre WO2010070258A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0823232.4 2008-12-19
GB0823232A GB2466459A (en) 2008-12-19 2008-12-19 Folded filter medium

Publications (1)

Publication Number Publication Date
WO2010070258A1 true WO2010070258A1 (fr) 2010-06-24

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PCT/GB2009/001234 WO2010070258A1 (fr) 2008-12-19 2009-05-19 Ensemble filtre

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GB (1) GB2466459A (fr)
WO (1) WO2010070258A1 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8429791B2 (en) 2009-10-15 2013-04-30 Dyson Technology Limited Surface treating appliance
US8438699B2 (en) 2009-10-15 2013-05-14 Dyson Technology Limited Surface treating appliance
US8539636B2 (en) 2009-10-15 2013-09-24 Dyson Technology Limited Surface treating appliance
US8650708B2 (en) 2009-10-15 2014-02-18 Dyson Technology Limited Surface treating appliance
US8671511B2 (en) 2009-10-15 2014-03-18 Dyson Technology Limited Surface treating appliance
US8677553B2 (en) 2009-10-15 2014-03-25 Dyson Technology Limited Surface treating appliance
US8683647B2 (en) 2009-10-15 2014-04-01 Dyson Technology Limited Surface treating appliance
US8793836B2 (en) 2009-10-15 2014-08-05 Dyson Technology Limited Surface treating appliance
US8935826B2 (en) 2009-10-15 2015-01-20 Dyson Technology Limited Surface treating appliance
US9009913B2 (en) 2009-10-15 2015-04-21 Dyson Technology Limited Surface treating appliance
US9044129B2 (en) 2009-10-15 2015-06-02 Dyson Technology Limited Surface treating appliance
US9326653B2 (en) 2009-10-15 2016-05-03 Dyson Technology Limited Surface treating appliance
JP2016083314A (ja) * 2014-10-29 2016-05-19 パナソニックＩｐマネジメント株式会社 電気掃除機

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