Patent Grant
11751740
This disclosure relates generally to surface cleaning apparatus, and in particular to a cyclone for a surface cleaning apparatus.
The following is not an admission that anything discussed below is part of the prior art or part of the common general knowledge of a person skilled in the art.
Various types of surface cleaning apparatus are known, including upright surface cleaning apparatus, canister surface cleaning apparatus, stick surface cleaning apparatus, central vacuum systems, and hand carriable surface cleaning apparatus such as hand vacuums. Further, various designs for cyclonic hand vacuum cleaners are known in the art.
The following introduction is provided to introduce the reader to the more detailed discussion to follow. The introduction is not intended to limit or define any claimed or as yet unclaimed invention. One or more inventions may reside in any combination or sub-combination of the elements or process steps disclosed in any part of this document including its claims and figures.
Size and weight are important features of any surface cleaning apparatus, but particularly of hand vacuum cleaners and other surface cleaning apparatus that are meant to be carried during a cleaning operation rather than rested on a floor or other surface during a cleaning operation. To reduce the size and/or weight of a vacuum cleaner, such as a hand vacuum cleaner, the dimensions of components may be reduced. For example, a diameter of a cyclone of an air treatment member may be reduced. However, if the dimensions of the components of a vacuum cleaner are reduced while the vacuum cleaner is designed to have the same air flow, then the cross-sectional flow area available for air flow within the vacuum cleaner is also reduced. A reduced cross-sectional flow area may increase back-pressure through the vacuum cleaner to such an extent that the cleaning efficiency of a vacuum cleaner is reduced due to a reduction in the velocity of air flow at the dirty air inlet of the vacuum cleaner. For example, when a cyclone has a diameter as small as between 0.5-4 inches, or 0.5-2.5 inches, the cross-sectional flow area will be reduced. If the vacuum cleaner is intended to have the same air flow as a hand vacuum cleaner having a large diameter cyclone (e.g., 6, 7 or 8 inches), then the back pressure through the cyclone assembly will be increased and the flow rate will be reduced.
In accordance with one aspect of this disclosure, which may be used alone or in combination with any other aspect, the cyclone of a surface cleaning apparatus, such as a hand vacuum cleaner, has wall portions that have a thinner wall thickness, e.g., parts of the cyclone such as the air inlet and/or the air outlet may have a wall portion having a thickness of 0.001 to 0.06 inches, 0.002 to 0.03 inches or 0.005 to 0.015 inches.
For example, if the diameter of a vortex finder is increased from, e.g., 21 mm to, e.g., 24 mm, then the cross-sectional flow are in the direction of flow through the vortex finder is increased from 346.4 mm2 to 452.4 mm2. Therefore, increasing the diameter of a vortex finder by 3 mm produces a 31% increase in the cross-sectional flow areas in the direction of flow through the vortex finder. Accordingly, small changes in the cross-sectional flow area can produce a significant change in the back-pressure.
Accordingly, the cross-sectional flow area through a cyclone assembly may be increased, and the back-pressure reduced, by decreasing the thickness of one or more wall portions.
In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the radial thickness may be 0.002 to 0.03 inches.
In any embodiment, the radial thickness may be 0.005 to 0.015 inches.
In any embodiment, the sidewall portions may extend towards the opposed end wall from the cyclone chamber inlet end wall.
In any embodiment, the cyclone chamber inlet end wall and the sidewall portions may be integrally formed.
In any embodiment, the cyclone chamber inlet end wall and the sidewall portions may be integrally formed of metal.
In any embodiment, the cyclone chamber inlet end wall and the sidewall portions may be integrally formed and the sidewall portions may be mechanically shaped to extend generally axially away from the cyclone chamber inlet end wall.
In any embodiment, the cyclone main body may comprise a main body sidewall extending between the cyclone chamber inlet body and the opposed end wall and the cyclone chamber inlet body is mounted to the cyclone main body.
In any embodiment, the main body sidewall may have a terminal end spaced from the opposed end wall, the sidewall portions may have a terminal end spaced from the cyclone chamber inlet end and the terminal end of the sidewall portions may mate with the terminal end of the main body sidewall.
In any embodiment, the terminal end of the main body sidewall may have recesses in which the terminal end of the sidewall portions are received.
In any embodiment, the cyclone chamber inlet body may be formed from a sheet having a plurality of flanges extending outwardly from the cyclone chamber inlet end wall, and the sidewall portions may be shaped by bending the flanges to extend at an angle to a plane in which the cyclone chamber inlet end wall extends.
In any embodiment, the cyclone chamber air outlet may be provided at the opposed end.
In any embodiment, the surface cleaning apparatus may further comprise a dirt collection chamber exterior to the cyclone chamber and the cyclone further comprises a dirt outlet in communication with the dirt collection chamber wherein the dirt outlet is provided at the opposed end.
In any embodiment, the cyclone may have a diameter of 0.5 inches to 2.5 inches.
In accordance with another aspect of this disclosure, which may be used alone or in combination with any other aspect, a cyclone assembly may be composed of individually manufactured parts that are then assembled together to form part or all of a cyclone assembly. For example, the cyclone air inlet or inlets and/or the vortex finder may not be able to be molded to have a desired wall thickness as discussed herein. Accordingly, the cyclone air inlet or inlets and/or the vortex finder may be separately manufactured and then assembled together with other parts, e.g., a cyclone main body, to form a cyclone. The cyclone air inlet or inlets and/or the vortex finder may be made of a more sturdy material, e.g., metal. Alternately, or in addition, they may be manufactured by bending a blank that is die cut from a sheet of thin walled material.
In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the main body sidewall may have a terminal end spaced from the opposed end wall, the sidewall portions may have a terminal end spaced from the cyclone chamber inlet end and the terminal end of the sidewall portions may mate with the terminal end of the main body sidewall.
In any embodiment, the terminal end of the main body sidewall may have recesses in which the terminal end of the sidewall portions are received.
In any embodiment, the sidewall portions may have a radial thickness of 0.001 to 0.06 inches, 0.001 to 0.025 inches or 0.003 to 0.015 inches.
In any embodiment, the cyclone chamber inlet body may be formed from a sheet having a plurality of flanges extending outwardly from the cyclone chamber inlet end wall, and the sidewall portions may be shaped by bending the flanges to extend at an angle to a plane in which the cyclone chamber inlet end wall extends.
In any embodiment, the cyclone chamber inlet end wall and the sidewall portions may be integrally formed or metal.
In any embodiment, the cyclone may have a diameter of 0.5 inches to 2.5 inches.
In accordance with this aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the vortex finder may have a radial thickness of 0.001 to 0.025 inches.
In any embodiment, the vortex finder may have a radial thickness of 0.003 to 0.015 inches.
In any embodiment, the cyclone may have a diameter of 0.5 inches to 4 inches.
In any embodiment, the cyclone may have a diameter of 0.5 inches to 2.5 inches.
In any embodiment, the cyclone may have a plurality of cyclone air inlets.
In any embodiment, the plurality of cyclone air inlets may be provided at the cyclone chamber outlet end and are positioned radially outwardly of the vortex finder.
In any embodiment, the surface cleaning apparatus may further comprise an outer wall positioned outwardly from the plurality of cyclone air inlets, and a flow region may extend around the plurality of cyclone air inlets between an inner surface of the outer wall and the plurality of cyclone air inlets, wherein the flow region may have a cross-sectional area in a plane transverse to the cyclone axis of rotation that is 1 to 1.5 a cross-sectional area of the vortex finder in the plane that is transverse to the cyclone axis of rotation.
In any embodiment, the cross-sectional area of the flow region may be 1.1 to 1.2 the cross-sectional area of the vortex finder.
In accordance with another aspect of this disclosure, which may be used alone or in combination with any other aspect, a surface cleaning apparatus may have a cyclone with a diameter of 0.5 inches to 4 inches and a vortex finder in a cyclone chamber of the cyclone, the vortex finder having a radial thickness of 0.001 to 0.025 inches.
The interior volume of a vacuum available to an air flow may be increased by decreasing the thickness of one or more wall portions. In some embodiments, the thickness of wall portions that can be manufactured independently from a component, such as a cyclone, of a vacuum cleaner may be reduced. For example, the thickness of a vortex finder may be reduced.
In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the vortex finder may be made of metal, sheet plastic or plastic machined to have a thickness of 0.001 to 0.025 inches.
In any embodiment, the vortex finder may comprise a component that is separately manufactured and secured to the cyclone chamber outlet end.
In any embodiment, the vortex finder may be made of metal, sheet plastic or plastic machined to have a thickness of 0.001 to 0.025 inches.
In any embodiment, the cyclone may have a plurality of cyclone air inlets.
In any embodiment, the plurality of cyclone air inlets may be provided at the cyclone chamber outlet end and are positioned radially outwardly of the vortex finder.
In any embodiment, the surface cleaning apparatus may further comprise an outer wall positioned outwardly from the plurality of cyclone air inlets, and a flow region may extend around the plurality of cyclone air inlets between an inner surface of the outer wall and the plurality of cyclone air inlets, wherein the flow region may have a cross-sectional area in a plane transverse to the cyclone axis of rotation that is 1 to 1.5 a cross-sectional area of the vortex finder in the plane that is transverse to the cyclone axis of rotation.
In any embodiment, the cyclone may have a diameter of 0.5 inches to 2.5 inches.
In any embodiment, the plurality of cyclone air inlets may be spaced from an inner surface of the cyclone chamber sidewall, wherein a flow region extends around the plurality of cyclone air inlets, wherein the flow region has a cross-sectional area in a plane transverse to the cyclone axis of rotation that is 1 to 1.5 the cross-sectional area of the vortex finder in the plane that is transverse to the cyclone axis of rotation.
In any embodiment, the cross-sectional area of the flow region may be 1.1 to 1.2 times the cross-sectional area of the vortex finder.
In order to inhibit hair and large particulate matter passing through a cyclone air outlet, the cyclone air outlet may comprise a vortex finder having a porous section at the interface of the cyclone chamber and the cyclone air outlet, or a shroud or screen may overlay the vortex finder. In smaller cyclones, the volume available for a porous section, shroud or screen is reduced, which reduces the surface area available for air flow to pass therethrough. In order to enable a porous section, shroud or screen to have a larger area for flow therethrough, the thickness of the substrate forming the porous section, shroud or screen may be reduced and the openings may be positioned closer together. For example, the openings may be laser cut or chemically etched into the substrate (e.g. a continuous non-woven substrate). Such production techniques enable a particular surface area of a continuous substrate to contain more openings, thereby permitting a greater air flow therethrough and reducing the backpressure produced by the porous section, shroud or screen. In addition, a larger number of smaller openings may be provided. It will be appreciated that the substrate may be metal or plastic.
In accordance with this broad aspect, there is provided a surface cleaning apparatus comprising:
In any embodiment, the substrate may be metal.
In any embodiment, the openings may be 0.0005 to 0.06 inches in length.
In any embodiment, the substrate may have a thickness of 0.002 to 0.08 inches.
In any embodiment, the openings may be spaced apart from each other by 0.0005-0.06 inches.
In any embodiment, the openings may be spaced apart from each other by 0.001-0.02 inches.
In accordance with this aspect, there is also provided a surface cleaning apparatus comprising:
In any embodiment, the openings may be 0.001 to 0.02 inches in length.
In any embodiment, the substrate may have a thickness of 0.005 to 0.04 inches.
In any embodiment, the openings may be spaced apart from each other by 0.0005-0.06 inches.
In any embodiment, the openings may be 0.002 to 0.01 inches in length, the substrate has a thickness of 0.01 to 0.02 and the openings are spaced apart from each other by 0.002 to 0.01 inches.
In any embodiment, the openings may be prepared by laser cutting or chemical etching.
In accordance with the forgoing aspect of this disclosure, a porous section, shroud or screen may be prepared by producing a woven mesh material and subjecting the woven mesh material to compression to reduce the thickness of the woven mesh material.
In accordance with this broad aspect, there is provided a method of producing a screen for a vortex finder of a cyclone for a surface cleaning apparatus, the method comprising:
In any embodiment, the woven mesh material may be stamped.
In any embodiment, the woven mesh material may be compressed between opposed rollers.
In any embodiment, the woven mesh material may be produced from metal strands.
In any embodiment, the openings may be 0.0005 to 0.06 inches in length.
In any embodiment, the openings may be 0.001 to 0.02 inches in length.
In any embodiment, the openings may be 0.002 to 0.01 inches in length.
In any embodiment, the openings the openings may be spaced apart from each other by 0.0005-0.06 inches.
It will be appreciated by a person skilled in the art that an apparatus or method disclosed herein may embody any one or more of the features contained herein and that the features may be used in any particular combination or sub-combination.
These and other aspects and features of various embodiments will be described in greater detail below.
For a better understanding of the described embodiments and to show more clearly how they may be carried into effect, reference will now be made, by way of example, to the accompanying drawings in which:
The drawings included herewith are for illustrating various examples of articles, methods, and apparatuses of the teaching of the present specification and are not intended to limit the scope of what is taught in any way.
Various apparatuses, methods and compositions are described below to provide an example of an embodiment of each claimed invention. No embodiment described below limits any claimed invention and any claimed invention may cover apparatuses and methods that differ from those described below. The claimed inventions are not limited to apparatuses, methods and compositions having all of the features of any one apparatus, method or composition described below or to features common to multiple or all of the apparatuses, methods or compositions described below. It is possible that an apparatus, method or composition described below is not an embodiment of any claimed invention. Any invention disclosed in an apparatus, method or composition described below that is not claimed in this document may be the subject matter of another protective instrument, for example, a continuing patent application, and the applicant(s), inventor(s) and/or owner(s) do not intend to abandon, disclaim, or dedicate to the public any such invention by its disclosure in this document.
The terms “an embodiment,” “embodiment,” “embodiments,” “the embodiment,” “the embodiments,” “one or more embodiments,” “some embodiments,” and “one embodiment” mean “one or more (but not all) embodiments of the present invention(s),” unless expressly specified otherwise.
The terms “including,” “comprising” and variations thereof mean “including but not limited to,” unless expressly specified otherwise. A listing of items does not imply that any or all of the items are mutually exclusive, unless expressly specified otherwise. The terms “a,” “an” and “the” mean “one or more,” unless expressly specified otherwise.
As used herein and in the claims, two or more parts are said to be “coupled”, “connected”, “attached”, or “fastened” where the parts are joined or operate together either directly or indirectly (i.e., through one or more intermediate parts), so long as a link occurs. As used herein and in the claims, two or more parts are said to be “directly coupled”, “directly connected”, “directly attached”, or “directly fastened” where the parts are connected in physical contact with each other. None of the terms “coupled”, “connected”, “attached”, and “fastened” distinguish the manner in which two or more parts are joined together.
Furthermore, it will be appreciated that for simplicity and clarity of illustration, where considered appropriate, reference numerals may be repeated among the figures to indicate corresponding or analogous elements. In addition, numerous specific details are set forth in order to provide a thorough understanding of the example embodiments described herein. However, it will be understood by those of ordinary skill in the art that the example embodiments described herein may be practiced without these specific details. In other instances, well-known methods, procedures, and components have not been described in detail so as not to obscure the example embodiments described herein. Also, the description is not to be considered as limiting the scope of the example embodiments described herein.
As used herein, the wording “and/or” is intended to represent an inclusive-or. That is, “X and/or Y” is intended to mean X or Y or both, for example. As a further example, “X, Y, and/or Z” is intended to mean X or Y or Z or any combination thereof.
General Description of a Surface Cleaning Apparatus
Referring to
In the embodiment illustrated, the surface cleaning apparatus 100 is a hand-held vacuum cleaner, which is commonly referred to as a “hand vacuum cleaner” or a “handvac”. As used herein, a hand-held vacuum cleaner or hand vacuum cleaner or handvac is a vacuum cleaner that can be operated generally one-handedly to clean a surface while its weight is held by the same one hand. This is contrasted with upright and canister vacuum cleaners, the weight of which is supported by a surface (e.g. floor below) during use. Optionally, surface cleaning apparatus 100 could be, for example, an upright vacuum cleaner, a canister vacuum cleaner, a stick vac, a wet-dry vacuum cleaner and the like.
Surface cleaning apparatus 100 has an air flow path extending from a dirty air inlet 112 to a clean air outlet 114 (
A suction motor 126 (
Air treatment member 110 is configured to remove particles of dirt and other debris from the air flow and/or otherwise treat the air flow. The air treatment member may comprise one or more cyclonic cleaning stages, each of which may comprise a single cyclone or a plurality of cyclones in parallel. In the illustrated example, air treatment member 110 comprises a cyclone assembly 130 which has a first cyclonic cleaning stage 170 and a second, downstream, cyclonic cleaning stage 172. Each cyclonic cleaning stage 170, 172 may comprise a single cyclone (or cyclone chamber) or a plurality of cyclones (or cyclone chambers) in parallel. As exemplified in
The first and second cyclonic cleaning stages 170, 172 may have a common dirt collection region. Alternately, each cyclonic cleaning stage 170, 172 may have one or more dirt collection regions. While in some embodiments the dirt collection region may be part of cyclone chamber, as exemplified cyclone chamber 174 has a dirt collection chamber 178 which is external to the cyclone chamber 174. Dirt collection chamber 178 is in communication with cyclone chamber 174 via one or more dirt outlets 180. As exemplified, cyclone chamber 176 has a dirt collection chamber 182 which is external to the cyclone chamber 176. Dirt collection chamber 182 is in communication with cyclone chamber 176 via one or more dirt outlets 184 (See
A cyclone chamber may have one or more air inlets and one or more air outlets. The air inlet(s) and air outlet(s) may be at the same end of a cyclone chamber or opposed ends.
As exemplified in
As exemplified in
Thin Walled Air Flow Passage
Portions of a cyclone may be made of a thin walled material. Each thin walled portion may be a separately manufactured part that is then secured to another part. For example, a thin walled part may be prepared by bending or stamping a die cut blank or substrate and then securing the thin walled part to a part which may be produced by molding.
An advantage of this design is that smaller cyclones, which would have smaller sized air inlets, may be prepared while enabling the cross-sectional area in a direction transverse to the flow direction to be enlarged.
A cyclone, such as for example a hand vacuum cleaner, may have a cyclone having a diameter of between 0.5 inches and 4 inches, 0.5 and 2.5 inches, or 0.5 and 2 inches or 0.5 and 1.5 inches. Portions of the walls that define one or both sides of an air flow passage for the cyclone may have a wall thickness (in a direction transverse to the direction of air flow through the air flow passage) of 0.001 to 0.06 inches, 0.002 to 0.03 inches, or 0.005 to 0.015 inches. The air flow passage having the thinner walls may be part or all of the air flow passage extending to the cyclone air inlets and/or the cyclone air outlet (a vortex finder).
Thin wall portions may be formed out of metal or plastic. Plastic is often used to form body portions of vacuums due to its strength profile and cost. Plastic may also be easy and/or cheap to form or shape. However, typically molding processed for vacuum cleaner parts produce parts having a relatively thick wall to provide a vacuum cleaner that is durable.
Accordingly, thin walled portions may be made of metal, such as aluminum or steel, and then may be secured to a molded plastic part. Using metal may enable the production of a part having a thin wall that is rigid and will withstand wear.
Alternately, thin walled parts may be made from plastic by alternate manufacturing methods. For example, one or more thin wall portions may be formed of sheet plastic or machined plastic. Wall portions may be formed by bending or machining a substrate into shape, such as by heat bending a plastic sheet.
Annular Flow Region
In accordance with one aspect, which may be used by itself or with any other aspect set out herein, a cyclone may have two or more inlets and a flow region or header may be provided to distribute the air amongst the plurality of cyclone air inlets. For example, as exemplified in
Radial flow region 194 extends between inner surface 192 of the cyclone chamber sidewall 188 and sidewall portions 158, and has a radial thickness R (see
Increasing the diameter of sidewall 188 would increase the size of the cross-sectional area of the flow region 194 in the radial direction, but it would also increase the size of the hand vacuum cleaner. If the hand vacuum cleaner is to be miniaturized, then it is advantageous to increase the cross-sectional area of the flow region 194 in the radial direction without increasing the size of any components.
It will be appreciated that the cross-sectional area of the flow region 194 in the radial direction may be increased by one or both of sidewall 188 and sidewall portions 158 having a smaller thickness in the radial direction. If the cross-sectional area of the flow region 194 in the radial direction is small, as in the case of a cyclone having a diameter of between 0.5 inches and 4 inches, 0.5 and 2.5 inches, or 0.5 and 2 inches or 0.5 and 1.5 inches, then a small reduction in the wall thickness may increase the cross-sectional area of the flow region 194 in the radial direction by 10%, 15%, 20%, 25% 50% or more.
It will be appreciated that, for small diameter cyclones, the cyclone may be manufactured by different techniques. As exemplified in
As exemplified in
Chamber inlet body 152 may be separately manufactured and then secured (releasably or permanently secured) to cyclone main body 150 to form cyclone 176. For example, chamber inlet body 152 may be secured to a support housing provided in surface cleaning apparatus 100 or it may be secured to cyclone main body 150.
As exemplified, chamber inlet body 152 and cyclone main body 150 are securable in an assembled configuration. Cyclone chamber 176 is formed between chamber inlet body 152 at a cyclone chamber inlet end 220 and an opposed end wall 154 formed by cyclone main body 150. Opposed end wall 154 is axially spaced apart from the cyclone chamber inlet end 220 and is at outlet end or opposed end 222. A main body sidewall 232 forms a radial outer wall of cyclone chamber 176. Main body sidewall 232 extends between the cyclone chamber inlet body 152 and the opposed end wall 154.
As exemplified in
Similarly, the first stage cyclone chamber 174 may also be formed from 2 or more components. As exemplified, first stage inlet portion 150a and first stage cyclone main body portion 150b together define the first stage cyclone 174. Alternately, portions 150a and 150b may be manufactured as a unitary body.
Portions 150b and 150c together with chamber inlet body 152 define the header or flow region 194 around the second stage cyclone air inlets 226. Releasable securing of two or more of portions 150a, 15b, 15c, 150d together may allow a user to access an interior of cyclone assembly 130, such as to empty a dirt chamber.
Cyclone chamber inlet body 152 may be mounted to the cyclone main body sidewall 232 by any means. As exemplified, main body sidewall 232 has a terminal end 234 spaced from the opposed end wall 154.
The plurality of cyclonic air inlets 226 are each formed between two adjacent sidewall portions 158. The sidewall portions 158 extend towards the opposed end wall 154 from the cyclone chamber inlet end wall 156. The plurality of sidewall portions 158 each have a terminal end 236 spaced from the cyclone chamber inlet end wall 156. The terminal ends 236 of the sidewall portions 158 mate with the terminal end 234 of the main body sidewall 232. For example, as exemplified, terminal end 234 of the main body sidewall 232 has recesses 238 in which the terminal end 236 of the sidewall portions 158 are received. They may be secured therein by welding, an adhesive or a friction fit.
Optionally, the cross-sectional area defined by cyclonic air inlets 226 in a direction transverse to the direction of flow passing between sidewall portions 58 is at least as large as the cross-sectional area of cyclone air outlet 140 in a direction transverse to the direction of flow through cyclone air outlet 140, or it may be 10%, 15%, 20% or 25% larger. Alternately, or in addition, the cross-sectional area defined by cyclonic air inlets 226 may be the same as the cross-sectional area of the flow region 194 in the radial direction±20%.
Cyclone Air Outlet Conduit
Alternately, or in addition to having a thin walled cyclone chamber inlet body 152, the cyclone air outlet (or vortex finder) may also have a thin walled construction and may also be separately manufactured.
Accordingly, as exemplified, cyclone chamber 176 has a vortex finder 190. Vortex finder 190 may also be separately manufactured and then mounted (releasably or permanently mounted) in cyclone assembly 130. It will be appreciated that the vortex finder may be of various designs that are known.
In a small diameter cyclone, as discussed herein, the vortex finder may have an inner flow diameter of, e.g., about 1 inch (20-25 mm). Increasing the diameter of outlet conduit 140 would increase the cross-sectional flow area through the outlet conduit. However, it would reduce the radial thickness of the cyclonic flow region between the outlet conduit and cyclone sidewall 232. However, by reducing the radial thickness of outlet conduit 140 the cross-sectional flow area through the outlet conduit may be increased without decreasing the radial thickness of the cyclonic flow region between the outlet conduit 140 and cyclone sidewall 232.
For example, if the internal diameter of a vortex finder is increased from, e.g., 21 mm to, e.g., 24 mm, then the cross-sectional flow are in the direction of flow through the vortex finder is increased from 346.4 mm2 to 452.4 mm2. Therefore, increasing the diameter of a vortex finder by 3 mm produces a 31% increase in the cross-sectional flow areas in the direction of flow through the vortex finder. Accordingly, small changes in the cross-sectional flow area can produce a significant change in the back-pressure.
Screen
Alternately, or in addition to having a thin walled cyclone chamber inlet body 152 and/or a thin walled cyclone outlet conduit 140, a screen that is provided at the cyclone outlet may also have a thin walled construction and may also be separately manufactured.
In order to inhibit hair and large particulate matter passing through a cyclone air outlet, such as in a first stage cyclone, a vortex finder may comprise a porous section or have a screen overlying an outlet conduit. The porous section or screen may have a wall thickness 204 of 0.001 to 0.06 inches, 0.002 to 0.03 inches, or 0.005 to 0.015 inches (see
As exemplified in
Increasing the size of the screen will increase the flow area through which air passes as it exits the cyclone chamber 174. However, this will reduce the volume in the cyclone chamber for cyclonic flow. Increasing the number of openings in the screen without reducing the size of the openings and without increasing the size of the screen will increase the flow area through which air passes as it exits the cyclone chamber 174.
The screen may have closely spaced and/or large openings to increase the flow area. For example, openings may be 0.0005 to 0.06 inches, 0.001 to 0.02 inches, or 0.002 to 0.01 inches in length 202. Openings may be spaced from each other by a spacing 206 of 0.0005 inches to 0.06 inches, 0.001 inches to 0.02 inches or 0.002 to 0.01 inches. Increasing the number of openings 200 will increase the flow area through which air passes as it exits the cyclone chamber 174. The number of openings may be increased by providing the openings closer together, without increasing the size of the screen.
Manufacturing Processes
In accordance with this aspect, a thin walled part may be prepared by bending or forming a part from a continuous planar substrate. Accordingly, a continuous substrate, that may be plastic or metal, may be prepared in a desired shape (e.g., by being stamped or die cut) and then formed (e.g., bent) to form a part. Such a technique may be used to form cyclone chamber inlet body 152.
As exemplified in
For example, cyclone chamber inlet body 152 may be formed from a generally planar sheet 164 having a plurality of flanges 166 extending outwardly from the cyclone chamber inlet end wall 156. Sidewall portions 158 may be formed by bending the flanges 166 to extend at an angle 168 to a plane in which the cyclone chamber inlet end wall 152 extends. For example, a metal plate 164 may be metal stamped to form sidewall portions 158, or a plastic sheet 164 may be shaped using a thermomechanical process such as a heat bending process to form sidewall portions 158. A plastic sheet 164 may, in some embodiments, be molded with bend lines at the base of each flange 166, or may otherwise incorporate structure to facilitate bending.
Flanges 166 may be bent to an angle 168 that maximizes stability and durability, such as an angle of 90°. Sidewall portions 158 may be arranged so that a projection 169 of a width of an opening 226 on an internal surface of a sidewall 158 is spaced from each axial edge 171 of the sidewall 158.
Alternately, or in addition, according to this aspect a screen 198 may be formed by chemical etching or laser cutting of a continuous substrate.
Alternately, or in addition, according to this aspect a screen may be formed from a woven mesh by compression.
As exemplified in
The woven mesh material 208 may be produced with a looser weave, which will have a larger spacing or opening 214 between strands 210 than a woven mesh that is not to be compressed. Compression flattens and/or otherwise shifts or reshapes strands 210 resulting in the openings in the screen becoming smaller. Accordingly, a larger spacing 214 is needed before compression to result a desired size 202 and spacing 206 of openings 200 in a compressed screen 198.
While the above description describes features of example embodiments, it will be appreciated that some features and/or functions of the described embodiments are susceptible to modification without departing from the spirit and principles of operation of the described embodiments. For example, the various characteristics which are described by means of the represented embodiments or examples may be selectively combined with each other. Accordingly, what has been described above is intended to be illustrative of the claimed concept and non-limiting. It will be understood by persons skilled in the art that other variants and modifications may be made without departing from the scope of the invention as defined in the claims appended hereto. The scope of the claims should not be limited by the preferred embodiments and examples, but should be given the broadest interpretation consistent with the description as a whole.
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