BACKGROUND
[0001] Particles, such as dirt and dust particles, can be separated from a fluid flow using
a cyclonic separator. Cyclonic separators have been used in vacuum cleaners, for example,
to separate dirt and dust from an air flow. Such separators can comprise relatively
low efficiency cyclones for separating large particles from an air flow and higher
efficiency cyclones for separating finer particles in the air flow. Such cyclonic
separators have been arranged in vacuum cleaners in series, with an upstream cyclonic
separator being combined with smaller downstream cyclonic separators arranged in parallel
with one another. An arrangement of this type is shown and described in
U.S. Patent No. 3,425,192 to Davis.
BRIEF SUMMARY OF THE DISCLOSURE
[0002] A first aspect of the present invention provides a dust collecting apparatus, for
a vacuum cleaner, comprising:
- a) an upstream cyclone having an inlet, an outlet, an upper end, a base, and a side
wall, wherein the inlet of the upstream cyclone is in fluid communication with a source
of fluid entering the apparatus;
- b) a plurality of first downstream cyclones each having an inlet and an outlet, the
first downstream cyclones being arranged about a longitudinal axis, wherein the inlet
of each of the first downstream cyclones is in fluid communication with the outlet
of the upstream cyclone to receive a flow of fluid therefrom; and
- c) a plurality of second downstream cyclones each having an inlet and an outlet, wherein
the inlet of each of the second downstream cyclones is in fluid communication with
the outlet of one of the first downstream cyclones, and wherein each of the second
downstream cyclones is positioned adjacent to the first downstream cyclone with which
it is in fluid communication and is in alignment with the longitudinal axis.
[0003] The dust collecting apparatus can separate particles, such as dirt and other particulates,
from an air flow. The upstream cyclone is for removing larger particles from the air
flow. The downstream cyclones are for removing smaller particles.
[0004] The second cyclones being arranged both in parallel and in tandem with one another
results in a more compact cyclonic dust collecting apparatus having enhanced suction
and dust collecting efficiency.
[0005] The upstream cyclone is preferably cylindrical, and the downstream cyclones each
preferably comprise a cylindrical upper portion and a frusto-conical downstream portion.
The outlet of the upstream cyclone can further be provided with a grill in order to
provide better particle separation.
[0006] The present apparatus can comprise a cylindrical housing for containing both the
upstream cyclone and the downstream cyclones. Preferably, the upstream cyclone is
positioned below the downstream cyclone, and the outlet or outlets of the upstream
cyclone are in fluid communication with a dust collecting chamber above the upstream
cyclone. In this embodiment, the downstream cyclones can be positioned such that at
least a lower portion of such cyclones project through the upper end of the housing
and are contained within the dust collecting chamber. The cone openings of the downstream
cyclones in this embodiment are preferably arranged at approximately the same vertical
height, and the outlet of the upstream cyclone is preferably positioned above the
cone openings.
[0007] In another embodiment, the first and second downstream cyclones are positioned within
the upstream cyclone. In this embodiment, at least a lower portion of each of the
first and second downstream cyclones is positioned in an interior portion of the upstream
cyclone, in order to provide a compact arrangement. The downstream cyclones can be
fully contained within the upstream cyclone in this embodiment.
[0008] The present apparatus is preferably contained in a vacuum cleaner. In one such embodiment,
the vacuum cleaner comprises two tanks, with the upstream cyclone contained in one
tank and the downstream cyclones contained in the other tank. The vacuum cleaner can
be, for example, a canister-type vacuum cleaner, an upright vacuum cleaner, or a stick
vacuum cleaner. The base of each of the tanks is preferably removable to allow dust
removal, although a door can alternatively be provided in the tanks for this purpose.
[0009] Indeed, in a second aspect, the invention provides a vacuum cleaner comprising:
- a) a first dust tank comprising a top, a base, and one or more sidewalls;
- b) an upstream cyclone located in the first dust tank, the upstream cyclone comprising
an inlet in fluid communication with a source of dirty air and an outlet;
- c) a second dust tank comprising a top, a base, and one or more sidewalls;
- d) at least one frusto-conical downstream cyclone located in the second dust tank,
the downstream cyclone comprising an inlet in fluid communication with the outlet
of the upstream cyclone.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] These and other features, aspects and advantages of the present invention are better
understood with regard to the following description, appended claims, and accompanying
figures where:
Figure 1 is a perspective, partial cutaway view of one embodiment of the present dust
collecting apparatus.
Figure 2 is a perspective, partial cutaway view of another embodiment of the present
dust collecting apparatus.
Figure 3A is a cross-sectional view of one embodiment of the upright vacuum cleaner
shown in Figure 5 taken along line 1-1.
Figure 3B is a cross-sectional view of A vacuum cleaner as claimed in Figure 3A taken
along line 2-2.
Figure 4A is a cross-sectional view of another embodiment of the upright vacuum cleaner
shown in Figure 5 taken along line 1-1.
Figure 4B is a cross-sectional view of A vacuum cleaner as claimed in Figure 4A taken
along line 2-2.
Figure 5 is a perspective view of a vacuum cleaner according to the present invention.
[0011] All dimensions specified in this disclosure are by way of example only and are not
intended to be limiting. Further, the proportions shown in these Figures are not necessarily
to scale. As will be understood by those with skill in the art with reference to this
disclosure, the actual dimensions of any device or part of a device disclosed in this
disclosure will be determined by their intended use.
DETAILED DESCRIPTION
Definitions
[0012] As used herein, the following terms and variations thereof have the meanings given
below, unless a different meaning is clearly intended by the context in which such
term is used.
[0013] "Communication" means fluid communication.
[0014] "Cyclone" means a vortex separator, i.e. a component of the present apparatus
in which a rotating fluid flow is established to separate dust and other components
of a fluid stream entering the cyclone.
[0015] "Downward" and "downwardly" mean in the direction of or toward a support surface
on which the present apparatus is or can be positioned. "Upward" and "upwardly" mean
in the opposite direction, i.e. away from such a support surface. "Above" refers to
a position which is located upwardly with respect to a referenced component, object,
or position, while "below" refers to a position which is located downwardly with respect
to a referenced component, object, or position.
[0016] "Dust" refers to the solid material entrained in an air flow entering the present
dust collecting apparatus, such as dirt, fiber, hair, and minute solid particles,
such as particles having diameters less than 500 micrometers.
[0017] "Horizontal" refers to an orientation approximately parallel to (i.e., not substantially
extending toward or away from) a support surface on which the present apparatus is
supported when in use.
[0018] "Particulate" means a solid particle, such as a particle of dust or dirt.
[0019] Particulates are generally suspended in air when entering the present dust collecting
apparatus, and also generally have a density greater than that of air.
[0020] "Vacuum cleaner" refers to a device for removing dust and other materials by suction.
Vacuum cleaners are generally portable, i.e. are designed to be moved to a location
in need of dust removal, for example, and typically are designed to operate over a
relatively flat surface such as a floor or a floor covering such as a rug or carpet.
[0021] "Vertical" refers to an orientation extending toward or away from a support surface
on which the present apparatus is supported, preferably at an angle of about 90° with
respect to the support surface.
[0022] As used herein, the term "comprise" and variations of the term, such as "comprising"
and "comprises," are not intended to exclude other additives, components, integers
or steps. The terms "a," "an," and "the" and similar referents used herein are to
be construed to cover both the singular and the plural unless their usage in context
indicates otherwise.
Dust Collecting Apparatus
[0023] In order to achieve high levels of particle removal, cyclonic vacuum cleaners which
are currently on the market generally incorporate a HEPA filter. Such filters are
effective in removing small particulate matter from an air stream so that the air
which exits a vacuum cleaner is essentially filtered. One disadvantage of using HEPA
filters, however, is that they provide substantial resistance to the flow of air through
a vacuum cleaner. By removing the HEPA filter from a filter assembly of a vacuum cleaner,
the pressure drop experienced by air flowing through the assembly can be substantially
increased and the amount of power used by the motor can be reduced, e.g. by up to
20%. However, without the HEPA filter the amount of particulate matter contained in
the air stream exiting the vacuum cleaner will be increased.
[0024] The present dust collecting apparatus reduces or eliminates the need for a HEPA filter
by providing improved particle separation in a compact arrangement, thereby providing
vacuum cleaners which employ the present dust collecting apparatus with improved pressure
drop and greater energy efficiency compared to cleaners that include HEPA filters.
In the present apparatus, particles are separated from an airflow with an upstream
cyclonic separator and one or more downstream cyclonic separators, the downstream
cyclones preferably comprising a plurality of cyclones that are arranged in tandem
and in parallel with one another. In one example, a first set of two downstream cyclonic
separators operate in tandem to separate particulates from a common air stream, while
one or more other sets of downstream cyclonic separators operate in parallel to the
first set to separate particulates from other air streams. Such an arrangement can
achieve a high separation efficiency while also allowing a compact combination of
the upstream and downstream cyclonic separators so that the present apparatus can
be used in a domestic vacuum cleaner.
[0025] The cyclones used in the present apparatus typically comprise a container which is
cylindrical, frusto-conical, or both, within which a rotational airflow is established
in order to separate heavier components of the airflow, such as dust, from the stream
of air. In many of the applications for which the present dust collecting apparatus
10 is intended to be used, the fluid is air and the particles are dirt and dust, such
as will be found in a domestic environment. It will be understood, however, that in
some embodiments liquids can also be effectively collected with the present apparatus
10, such as in wet/dry vacuuming applications in which either solids, liquids, or
both are collected with the present apparatus 10.
Upstream Cyclone
[0026] The present dust collecting apparatus 10, as described above, comprises an upstream
cyclone 27 and a plurality of downstream cyclones 31. In the embodiment shown in Figures
1 and 2, the upstream cyclone has an upper end 24, a base 25, and a side wall 28 which
extends between the upper end 24 and the base 25. The side wall 28 can be cylindrical,
as in the embodiment of Figure 1, or can also be frusto-conical or comprise a frusto-conical
portion. In the embodiment of Figure 2, side wall 28 comprises an upper cylindrical
portion 29 and a lower frusto-conical portion 30, so that the upstream cyclone 27
tapers as the side wall 28 descends from the upper end 24 toward the base 25. A tangential
inlet 26 is provided in the side wall 27 of the upstream cyclone 27 adjacent the upper
end 24. The tangential inlet 26 is capable of delivering a particle-laden fluid to
the interior of the upstream cyclone 27 in a direction which is tangential to the
side wall 28 so as to set up a swirling, preferably helical flow in the interior of
the upstream cyclone 27.
[0027] The upstream cyclone 27 has an outlet 23 which can be located centrally inside and/or
outside of the upper end 24 and which communicates with the interior of the upstream
cyclone 27. In one embodiment, the outlet 23 can comprise a conduit 12 having a peripheral
grill 11 inside the upper end 24 of the upstream cyclone 27, as shown in Figures 3A
and 4A. Grills, such as those disclosed in
U.S. Patent No. 6,702,868, can serve to exclude larger particulates and further assist in removing such particulates
from the airflow entering the outlet 23 of the upstream cyclone 27. Alternatively,
as in the embodiment shown in Figure 1, the outlet 23 can comprise a generally cylindrical
conduit 12 having an inlet in communication with the upper end 24 of the upstream
cyclone 27 and an outlet 14 which communicates with the downstream cyclones 31. In
the embodiment of Figure 1, the conduit 12 extends vertically upwardly from the upper
end 24 of the upstream cyclone 27 and is covered with a cover 15 having openings which
exclude larger particulates, thereby assisting in the filtration of air passing into
the downstream cyclones 31. The conduit outlet 14 in this embodiment communicates
with the downstream cyclones via a dust collecting chamber 16, with the outlet 14
being located above the lower end 33 of the downstream cyclones 31 in the dust collecting
chamber 16.
[0028] In the embodiment of Figure 1, the upstream cyclone 27 and the dust collecting chamber
16 are both contained by a cylindrical housing 18 within which both components are
arranged. By positioning the dust collecting chamber 16 directly above the upper end
24 of the upstream cyclone 27, the present apparatus 10 can be made more compact.
[0029] An alternative compact arrangement of the upstream and downstream cyclones is shown
in Figure 2. In this embodiment, the side wall 28 of the upstream cyclone 27 is positioned
around and thereby contains at least a portion of each of the downstream cyclones
31. An inner side wall 22 is positioned between the side wall 28 and a lower portion
of the downstream cyclones 31, thereby separating the more particulate-laden portion
of the fluid flow within the upstream cyclone 27 from the downstream cyclones 31.
The inner side wall 22 extends downwardly from a point above the cone openings 34
of the frusto-conical cyclone portions 39 of the downstream cyclones 31 toward the
base 25 of the upstream cyclone 27, preferably extending below the lower end 33 of
the downstream cyclones 31. The inner side wall 22 also thereby helps to funnel dust
exiting the cone openings 34 of the downstream cyclones 31 to a lower end of the apparatus
10. This embodiment of the present apparatus allows dust collected from both the upstream
cyclone 27 and the downstream cyclones 31 to be accumulated in a common area at or
adjacent to the base 25, thereby facilitating dust removal. A grill (not shown) can,
in an alternative embodiment, be included in Apparatus as claimed inFigure 2 between
the top of the inner side wall 22 and the upper end 24 in order to further assist
in particle separation.
Downstream Cyclones
[0030] In the present apparatus 10, an inlet conduit 36 in fluid communication with the
outlet 23 of the upstream cyclone 27 communicates with one or more downstream cyclones
31. When a plurality of downstream cyclones are used in the present apparatus, as
in the embodiments of Figures 1, 2, and 4, a plurality of inlet conduits 36 to such
downstream cyclones 31 are preferably dimensioned and arranged to receive substantially
equal portions of the fluid flow from the upstream cyclone 27, so as to divide the
flow of air from the outlet 23 which enters each of the downstream cyclones 31 into
approximately equal volumes.
[0031] In the embodiment of Figure 1, fluid flow from the upstream cyclone 27 is directed
to the downstream cyclones via an inlet 9 comprising a generally cylindrical pipe
or peripheral grill that extends vertically upwardly from within the dust collecting
chamber 16, though a direct connection between the outlet 23 and inlet 9 is also possible.
The inlet 9 receives a flow of air exiting the upstream cyclone 27 and divides it
between several joined conduits, each of which is dimensioned and arranged so as to
receive a substantially equal part of any fluid flow received from the upstream cyclone
27 and to deliver such fluid portion to a downstream cyclone inlet 36.
[0032] Each downstream cyclone 31 in the present apparatus 10 is in communication with an
inlet conduit 36. The downstream cyclones 31 preferably have an upper cylindrical
portion 39 with which the respective inlet conduit 36 communicates in a tangential
manner and a frusto-conical cyclone portion 37 which descends from the upper cylindrical
portion 39. At the lower end 33 of such downstream cyclones, the frusto-conical cyclone
portion 37 has a cone opening 34. As shown in Figures 1, 2, and 4A, the downstream
cyclones 31, preferably including both upper cylindrical portions 39 and frusto-conical
cyclone portions 37, are preferably arranged vertically around a longitudinal axis
in a symmetrical manner. The cone openings 34 are also preferably arranged close to
one another at approximately the same vertical height.
[0033] In the embodiment of Figure 1, each of the downstream cyclones 31 passes through
the upper end of the cylindrical housing, which can include apertures sized to receive
the downstream cyclones 31. Each of the downstream cyclones 31 is fixed to the rim
of the respective aperture in a manner which maintains a seal therebetween. As shown
in Figure 1, a portion of the upper cylindrical portion 39 of a downstream cyclone
31 is preferably positioned in the apertures.
[0034] In the alternative embodiment shown in Figure 2, the downstream cyclones 31 project
into the interior of the upstream cyclone 27. Positioning at least a lower portion
of the downstream cyclones 31 in an interior portion of the upstream cyclone 27 provides
for greater compactness. This arrangement is thus suitable for use in an application
where dimensions are to be kept as small as possible. An example of such an application
is a domestic vacuum cleaner in which consideration of size and weight are of considerable
importance. Alternatively, the downstream cyclones 31 can be arranged on the outside
of the upstream cyclonic separator, for example if it is desired to contain other
components of a vacuum cleaner in the interior portion of the upstream cyclone 27.
Tandem Downstream Cyclones
[0035] In a preferred embodiment, each group of downstream cyclones 31 comprises a pair
of cyclones 42, 44 arranged in tandem with each other. In this embodiment, the flow
of air received from the upstream cyclone 27 first enters into the first paired cyclone
42 and is subjected to cyclonic separation, after which the relatively cleaned airflow
flows into the second paired cyclone 44. As shown in Figures 1 and 2, the flow of
air (shown by arrows and dotted lines) enters the first paired cyclone 42 through
the inlet conduit 36, and after swirling down through the first paired cyclone 42
is drawn through a joining conduit and into the inlet 45 of the second paired cyclone
44, where it is subjected to a further cyclonic separation. In this way, a stream
of dirty air entering a vacuum cleaner comprising this embodiment of the present apparatus
10 will have passed through a cyclone three times, i.e. through three different cyclones
(e.g., cyclones 27, 42, and 44), before reaching the downstream cyclone outlet or
outlets.
[0036] The first paired cyclone 42 is preferably arranged adjacent to the second paired
cyclone 44 and is aligned along a common longitudinal axis, in order to form a compact
design. As shown in Figures 1 and 2, a plurality of such first and second paired cyclones
are preferably positioned adjacent to each other and are aligned around a common longitudinal
axis, preferably an axis passing through a central portion of the apparatus 10 and
more preferably through the horizontal center of the apparatus 10 (e.g., the axis
defined by the combined outlet 41). The plurality of first and second paired cyclones
are also preferably positioned such that their cone openings 34 are aligned along
a common horizontal axis, i.e. are approximately the same vertical distance from the
base 25 and/or from a support surface on which the apparatus 10 is supported, facilitating
the collection of dust and allowing for a compact design.
[0037] Each of the second paired cyclones 44 has an outlet conduit 38 which is preferably
located centrally in the upper portion of the second paired cyclone 44. The outlet
conduits 38 preferably meet at a junction 40 to form a combined outlet 41, so that
air entering the apparatus 10 via the tangential inlet 26 finally leaves the apparatus
via the combined outlet 41. In the embodiment of Figure 4, each of the second downstream
cyclones 48 is similarly provided with an outlet conduit 38.
Dual Barrel Design
[0038] Further embodiments of the present apparatus are shown in Figures 3 and 4. In these
embodiments, the apparatus 10 comprises a cyclonic separator having an upstream cyclone
27 in a first dust tank 51 and one or more downstream cyclones 31 in a second dust
tank 52. In the first dust tank 51, relatively large particles 53 entrained within
the incoming fluid flow are deposited in the lower portion of the dust tank 51. The
outlet conduit 23 of the upstream cyclone 27 can be located in the lid of dual barrel
of a cylinder vacuum cleaner, for example.
[0039] One or more downstream cyclones 31 are located in the second dust tank 52. Each of
the downstream cyclones 31 has a tangential inlet opening connected with the inlet
conduit 36. The downstream cyclones 31 can be arranged in the second dust tank 52
as described above, and the finer dust particles 54 can be deposited into the lower
portion of the second dust tank 52. In one alternative embodiment, shown in Figure
3A, a single downstream cyclone 31 can be used, although it is preferred that a plurality
of downstream cyclones 31 be used, as shown in Figures 1, 2, and 4. In the embodiment
shown in Figures 4A and 4B, a first, preferably cylindrical downstream cyclone 47
receives a fluid flow from the upstream cyclone 27, and after undergoing cyclonic
separation of particles in the first downstream cyclone the fluid flow is distributed
to a plurality of second, preferably frusto-conical downstream cyclones 48 positioned
within the cylindrical cyclone 47, as in the embodiment of Figure 2.
[0040] Each of the first and second dust tanks comprises a base 55, a top 57, and one or
more sidewalls 58, and the two dust tanks are preferably arranged adjacent to each
other (side by side) in a vacuum cleaner. Figure 5 illustrates an embodiment in which
two dust tanks are provided in this way in an upright vacuum cleaner, i.e. a vacuum
cleaner having a cleaning head onto which a handle and dust collection bag or chamber
are attached. The two tanks each preferably have a separate top, base and sidewall,
with the base preferably being removable to allow for dust removal. Alternatively,
a common base can be used for the two dust tanks to facilitate the removal of dust
from both tanks.
Operation
[0041] The flow of fluid through the present apparatus is illustrated in Figures 1-4B with
arrows. A fluid flow in which particles are entrained enters the present apparatus
10 via the tangential inlet 26. The orientation of the tangential inlet 26 cause the
fluid flow to follow a helical path within the upstream cyclone 27 so that the fluid
flow travels downwardly towards the base 25. Relatively large particles 53 entrained
within the incoming fluid flow are deposit in the lower portion of the interior of
the upstream cyclone 27 adjacent the base 25. The fluid flow, in which smaller particles
remain entrained, then moves inwardly and upwardly towards the upper end 24 of the
upstream cyclone 27. The fluid flow exits the upstream cyclone 27 via the outlet 23
along which the fluid flow travels until it reaches the one or more downstream cyclones
31. In the embodiments of Figures 1, 2, and 4, the fluid flow is then divided into
separate fluid flows, for example into five separate fluid flows in the embodiment
of Figure 4. When each portion of the fluid flow reaches the upper cylindrical portion
39 of a downstream cyclone 31, such as a respective first paired cyclone 42, it again
follows a helical path therein in view of the tangential orientation of the inlet
conduit 36. The separated fine particles 54 are deposited below the cone openings
34 of the downstream cyclones 31, for example in the second dust tank 52 in the embodiments
of Figures 3 and 4, while the remainder of the fluid leaves the final downstream cyclone
31. The separate fluid flows from each downstream cyclone 31 or set of paired cyclones
42, 44 are combined at the junction 40 and leave the apparatus via the combined outlet
41.
Vacuum Cleaners
[0042] The present dust collecting apparatus can be included in a variety of different vacuum
cleaners known to the art. In a preferred embodiment, shown in Figure 5, the present
dust collecting apparatus comprises two dust tanks, as in the embodiments of Figures
3 and 4, and is included in an upright vacuum cleaner 100. The upright vacuum cleaner
100 illustrated in Figure 5 comprises an articulating cleaner head 110 which can articulate
from an upright resting position to an operating position in which the handle 120
is lowered with respect to the resting position of the handle 120 by means of a control
lever 112. The cleaner head 100 includes an opening for receiving a dust-laden airflow,
which travels through a conduit such as the flexible conduit 130 having an outlet
in communication with the inlet 26 of the upstream cyclone 27 of the present dust
collecting apparatus 10. The upright vacuum cleaner 100 also preferably includes wheels
140 on either lateral side of the cleaner head 110 to facilitate movement of the vacuum
cleaner 100 across a surface, as well as other components typically included in upright
vacuum cleaners such as electrical cord hooks 104 and a hook 106 for the flexible
conduit 130.
[0043] The present dust collecting apparatus can also be used in other types of vacuum cleaners
known to the art, such as stick vacuum cleaners, which operate via a handle like upright
vacuum cleaners but do not have a cleaner head that articulates. The present dust
collecting apparatus can also be used in a canister-type vacuum cleaner, in which
the cleaner head generally comprises a rigid wand and is connected to the dust collecting
apparatus and other powered components of the vacuum cleaner via a flexible hose or
other conduit. Alternatively, the present dust collecting apparatus can be incorporated
into a stationary vacuum cleaner system and connected to one or more locations via
fixed conduits.
[0044] In all vacuum cleaner applications, the apparatus 10 will require periodic emptying
of separated particles, i.e. dust. One way to accomplish this can be to arrange for
the base 25 to be made removable from (i.e., reversibly secured to) the side wall
28 for emptying purposes. Alternatively, a door can be provided in sidewall 28 in
order to access dust collected in the apparatus 10, such as in the dust collecting
chamber 16 and/or in the upstream cyclone 27 in the embodiment of Figure 1.
[0045] Although the present invention has been discussed in considerable detail with reference
to certain preferred embodiments, other embodiments are possible. The steps disclosed
for the present methods are not intended to be limiting nor are they intended to indicate
that each step depicted is essential to the method, but instead are exemplary steps
only. Therefore, the scope of the appended claims should not be limited to the description
of preferred embodiments contained in this disclosure. All references cited herein
are incorporated by reference to their entirety.
[0046] Throughout the description and claims of this specification, the words "comprise"
and "contain" and variations of the words, for example "comprising" and "comprises",
means "including but not limited to", and is not intended to (and does not) exclude
other moieties, additives, components, integers or steps.
[0047] Throughout the description and claims of this specification, the singular encompasses
the plural unless the context otherwise requires. In particular, where the indefinite
article is used, the specification is to be understood as contemplating plurality
as well as singularity, unless the context requires otherwise.
[0048] Features, integers, characteristics, compounds, chemical moieties or groups described
in conjunction with a particular aspect, embodiment or example of the invention are
to be understood to be applicable to any other aspect, embodiment or example described
herein unless incompatible therewith.
[0049] The reader's attention is directed to all papers and documents which are filed concurrently
with or previous to this specification in connection with this application and which
are open to public inspection with this specification, and the contents of all such
papers and documents are incorporated herein by reference.
[0050] All of the features disclosed in this specification (including any accompanying claims,
abstract and drawings), and/or all of the steps of any method or process so disclosed,
may be combined in any combination, except combinations where at least some of such
features and/or steps are mutually exclusive.
[0051] Each feature disclosed in this specification (including any accompanying claims,
abstract and drawings), may be replaced by alternative features serving the same,
equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly
stated otherwise, each feature disclosed is one example only of a generic series of
equivalent or similar features.
[0052] The invention is not restricted to the details of any foregoing embodiments. The
invention extends to any novel one, or any novel combination, of the features disclosed
in this specification (including any accompanying claims, abstract and drawings),
or to any novel one, or any novel combination, of the steps of any method or process
so disclosed.
1. A dust collecting apparatus, comprising:
a) an upstream cyclone having an inlet, an outlet, an upper end, a base, and a side
wall, wherein the inlet of the upstream cyclone is in fluid communication with a source
of fluid entering the apparatus;
b) a plurality of first downstream cyclones each having an inlet and an outlet, the
first downstream cyclones being arranged about a longitudinal axis, wherein the inlet
of each of the first downstream cyclones is in fluid communication with the outlet
of the upstream cyclone to receive a flow of fluid therefrom; and
c) a plurality of second downstream cyclones each having an inlet and an outlet, wherein
the inlet of each of the second downstream cyclones is in fluid communication with
the outlet of one of the first downstream cyclones, and wherein each of the second
downstream cyclones is positioned adjacent to the first downstream cyclone with which
it is in fluid communication and is in alignment with the longitudinal axis.
2. Apparatus as claimed in claim 1, wherein at least the lower portion of each of the
first and second downstream cyclones is positioned in the interior portion of the
upstream cyclone; and/or
3. Apparatus as claimed in claim 1, wherein the upstream cyclone is contained in a first
tank and the downstream cyclones are contained in the second tank.
4. Apparatus as claimed in claim 1, wherein the upstream cyclone comprises a cylindrical
housing positioned below said downstream cyclones.
5. Apparatus as claimed in claim 4, wherein the outlet of the upstream cyclone comprises
a conduit extending upwardly from an upper end of the upstream cyclone and into a
dust collecting chamber, the conduit extending above lower cone openings of each of
the first and second downstream cyclones.
6. Apparatus as claimed in any of the preceding claims, wherein lower cone openings of
the first and second downstream cyclones are arranged at approximately the same vertical
height.
7. Apparatus as claimed in any of the preceding claims, wherein at least a lower portion
of each of the first and second downstream cyclones is positioned in an interior portion
of the upstream cyclone.
8. Apparatus as claimed in any of the preceding claims, wherein the apparatus is contained
in an upright vacuum cleaner.
9. Apparatus as claimed in any of the preceding claims, further comprising a base reversibly
secured to the apparatus in order to allow dust removal.
10. Apparatus as claimed in any of the preceding claims, wherein the side wall of the
upstream cyclone further comprises a door to allow dust removal.
11. A vacuum cleaner comprising:
a) a first dust tank comprising a top, a base, and one or more sidewalls;
b) an upstream cyclone located in the first dust tank, the upstream cyclone comprising
an inlet in fluid communication with a source of dirty air and an outlet;
c) a second dust tank comprising a top, a base, and one or more sidewalls;
d) at least one frusto-conical downstream cyclone located in the second dust tank,
the downstream cyclone comprising an inlet in fluid communication with the outlet
of the upstream cyclone.
12. A vacuum cleaner as claimed in claim 11, further comprising a cylindrical cyclone
upstream from the at least one frusto-conical cyclone, wherein the at least one frusto-conical
downstream cyclone is positioned within the cylindrical cyclone.
13. A vacuum cleaner as claimed in claims 11 or 12, wherein the vacuum cleaner is selected
from the group consisting of a canister-type vacuum cleaner, an upright vacuum cleaner,
and a stick vacuum cleaner.
14. A vacuum cleaner as claimed in any of claims 11 to 13, wherein
the base of each of the first and second dust tanks is reversibly secured to the respective
side walls of the first and second dust tanks in order to allow dust removal; and/or
the side walls of each of the first and second dust tanks further comprises a door
to allow dust removal.
15. A dust collecting apparatus as claimed in any of claims 1 to 10 incorporated in a
vacuum cleaner as claimed in any of claims 11 to 14.