U.S. patent application number 14/000368 was filed with the patent office on 2014-01-30 for vacuum cleaner.
This patent application is currently assigned to AKTEIBOLAGET ELECTROLUX. The applicant listed for this patent is Hakan Miefalk. Invention is credited to Hakan Miefalk.
Application Number | 20140026356 14/000368 |
Document ID | / |
Family ID | 44237322 |
Filed Date | 2014-01-30 |
United States Patent
Application |
20140026356 |
Kind Code |
A1 |
Miefalk; Hakan |
January 30, 2014 |
Vacuum Cleaner
Abstract
The invention is directed to vacuum cleaner (1) comprising a
horizontal type cleaner body (2) with a front (5) and back side (6)
and two lateral sides (7), at least one primary stage cyclone dust
separator (8) having a dust outlet opening fluidly connected to a
primary stage dust collecting chamber (9), and at least one
secondary stage cyclone dust separating unit (12). The primary
stage dust collecting chamber (9) and the at least one secondary
stage cyclone dust separating unit (12) is mounted at the front
side (5) in a lateral side by side arrangement in between the
lateral sides (7).
Inventors: |
Miefalk; Hakan; (Stockholm,
SE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Miefalk; Hakan |
Stockholm |
|
SE |
|
|
Assignee: |
AKTEIBOLAGET ELECTROLUX
STOCKHOLM
SE
|
Family ID: |
44237322 |
Appl. No.: |
14/000368 |
Filed: |
February 22, 2012 |
PCT Filed: |
February 22, 2012 |
PCT NO: |
PCT/EP12/53027 |
371 Date: |
September 18, 2013 |
Current U.S.
Class: |
15/353 |
Current CPC
Class: |
A47L 9/1691 20130101;
A47L 9/10 20130101; A47L 9/1683 20130101; A47L 9/1608 20130101;
A47L 5/362 20130101; A47L 9/108 20130101; A47L 9/1641 20130101;
A47L 9/19 20130101; A47L 9/327 20130101 |
Class at
Publication: |
15/353 |
International
Class: |
A47L 9/16 20060101
A47L009/16 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 22, 2011 |
EP |
PCT/EP2011/000844 |
Claims
1. A vacuum cleaner, comprising: a horizontal type cleaner body
having a top side, a bottom side, a front side, a back side, and
two lateral sides, at least one primary stage cyclone dust
separator having a dust outlet opening fluidly connected to a
primary stage dust collecting chamber, and at least one secondary
stage cyclone dust separating unit, wherein the primary stage dust
collecting chamber and the at least one secondary stage cyclone
dust separating unit are mounted at the front side in a lateral
side by side arrangement in between the lateral sides.
2. A vacuum cleaner according to claim 1, comprising two secondary
stage cyclone dust separating units mounted at opposite lateral
sides and side by side with the primary stage dust collecting
chamber which is centered between the two secondary stage cyclone
dust separating units and the lateral sides.
3. A vacuum cleaner according to claim 1, wherein each of the at
least one secondary stage cyclone dust separating unit comprises a
plurality of conical cyclones arranged side to side in parallel to
a respective lateral side.
4. A vacuum cleaner according claim 3, wherein the conical cyclones
of the at least one secondary stage cyclone dust separating unit
are mounted and adapted such that a center axis of each of the
conical cyclones is generally tilted from the top side and the
front side toward the bottom side and the back side.
5. A vacuum cleaner according to claim 4, wherein the center axes
of the conical cyclones of the at least one secondary stage cyclone
dust separating unit are tilted by an angle (.alpha.) relative to a
center axis of the cleaner body, wherein the angle (.alpha.) is in
a range of 10 to 50 degrees.
6. A vacuum cleaner according to claim 4, wherein each of the at
least one secondary stage cyclone dust separating unit comprises a
secondary stage dust collecting chamber, wherein each of the
conical cyclones in the plurality of conical cyclones has a dust
outlet opening, and wherein the secondary stage dust collecting
chamber is downstream of and fluidly connected to the dust outlet
openings of the secondary stage conical cyclones.
7. A vacuum cleaner according to claim 6, wherein with regard to
the front side to back side direction, each of the at least one
secondary stage dust collecting chamber is positioned and mounted
behind and flush with a respective one of the plurality of
secondary stage conical cyclones.
8. A vacuum cleaner according to claim 6, wherein each of the at
least one secondary stage dust collecting chamber has a triangular
shaped cross section in a plane parallel to one of the lateral
sides.
9. A vacuum cleaner according to claim 6, further comprising a
tertiary stage dust separator which is, in the front side to back
side direction, mounted behind the primary stage dust collecting
chamber and laterally adjacent to the at least one secondary stage
dust collecting chamber.
10. A vacuum cleaner according to claim 1, further comprising air
channels connecting an air outlet of the at least one primary stage
cyclone dust separator to the at least one secondary stage cyclone
dust separating unit, wherein the air channels are guided at the
top side of the cleaner body.
11. Vacuum cleaner according to claim 1, wherein the at least one
primary stage cyclone dust separator is, in the front side to back
side direction, mounted behind the at least one primary stage dust
collecting chamber.
12. A vacuum cleaner according to claim 5, wherein the angle
(.alpha.) is 30 degrees.
13. A vacuum cleaner according to claim 11, wherein the at least
one primary stage cyclone dust separator is a horizontal type dust
separator.
Description
[0001] The present invention is directed to a vacuum cleaner. In
more detail, the invention is directed to a cyclone type vacuum
cleaner.
[0002] Cyclone type vacuum cleaners are widely known because of
their benefit in bagless dust collection. Bagless or cyclone type
vacuum cleaners or respective cyclone dust separating units are
known for example from documents EP 1 042 981 A1, EP 1774887 A1, EP
1 688 078 A2, EP 1 952 745 A2 and WO 2011/058365.
[0003] Cyclone type vacuum cleaners, in particular mentioned in the
state of technology documents listed before, are still
comparatively large in size and provide comparatively complicated
air guiding and dust collecting devices and units.
[0004] Therefore, it is one of the objects of the present invention
to provide a cyclone type vacuum cleaner having a comparatively
compact design. In particular it is an object to provide a multiple
stage cyclonic vacuum cleaner of comparatively compact design.
Further, the vacuum cleaner shall have enhanced usability and
operability, in particular with respect to dust separation and dust
collecting chambers.
[0005] These and further objects are solved by the features of
claim 1. Embodiments and variants result from the dependent
claims.
[0006] According to claim 1, a vacuum cleaner is provided which
comprises a horizontal type cleaner body having a front and back
side and two lateral sides.
[0007] The term "horizontal type cleaner body" in particular shall
refer to the orientation of the cleaner body in normal or intended
use. Such a horizontal type cleaner body may comprise, as already
implemented with known devices, wheels attached thereto and
provided for easily moving the vacuum cleaner over the floor
underneath during vacuum-cleaning.
[0008] A horizontal type vacuum cleaner in the meaning of the
present application is for example shown in EP 1 774 887 A1. Aside
from the horizontal type vacuum cleaners there also exist vertical
type constructions generally comprising a handle to which the
cleaner body is mounted to and by which the cleaner body is moved
in concert with vacuum-cleaning operations. One example of such a
vertical type vacuum cleaner is shown in WO 2011/058365.
[0009] The vacuum cleaner comprises at least one primary stage
cyclone dust separator which has a dust outlet opening fluidly
connected to a primary stage dust collecting chamber.
[0010] The vacuum cleaner further comprises a secondary cyclonic
separation step. In more detail, the vacuum cleaner comprises at
least one secondary stage cyclone dust separating unit. The
secondary stage cyclone dust separating unit is coupled and
installed downstream the primary stage cyclone dust separator.
Providing a secondary stage dust separation stage greatly enhances
overall dust separation efficiency
[0011] With the proposed vacuum cleaner, the primary stage dust
collecting chamber and the at least one secondary stage cyclone
dust separating unit is mounted at the front side in a lateral side
by side arrangement in between the lateral sides.
[0012] The proposed arrangement of primary stage dust collecting
chamber and the at least one secondary stage cyclone dust
separating unit enables space saving arrangements and in particular
compact overall designs of the cleaner body and vacuum cleaner.
[0013] With the proposed vacuum cleaner construction, the lateral
extension of the primary stage dust collecting chamber is less than
the overall width of the cleaner body and vacuum cleaner. Space not
occupied by the primary stage dust collecting chamber in lateral
direction can be used as installation space for at least one of the
at least one secondary stage cyclone dust separating unit.
[0014] Providing the primary stage dust collecting chamber at the
front side has, amongst others, the advantage that it is easily
accessible. Further if adequate front side fill level indicators,
in particular inspection windows, are provided a user can quickly
inspect the filling level of the primary stage dust collecting
chamber. The term "front side fill level indicator" in particular
shall mean that the fill level indicator is accessible and visible
at and from the front side of the vacuum cleaner.
[0015] The fill level indicator, in particular inspection window,
in particular when arranged immediately at the front side, is
effective in presenting the filling level of the primary stage dust
collecting chamber to a user, and will contribute to adequate
emptying intervals. This in turn secures optimal cleaning
efficiency of the vacuum cleaner. Note that the inspection window
may be implemented as a translucent or transparent wall section of
the primary stage dust collecting chamber.
[0016] As will be described in more detail further below, arranging
the at least one secondary stage cyclone dust separating unit at
the front side, side to side with the primary stage dust collection
chamber allows a space saving arrangement of secondary stage dust
collecting chambers of respective secondary stage cyclone dust
collecting units.
[0017] Note that the primary stage cyclone dust separator may be
provided and adapted to separate coarse dust, debris and other
particulate matter from air. Secondary stage cyclone dust
separating units may be adapted to separate fine dust from air, in
particular dust that either could not be separated in the first
stage or that is too fine or small to be separated in the first
stage. Combining several dust separation stages in series greatly
enhances the overall cleaning efficiency.
[0018] In a preferred embodiment, the vacuum cleaner comprises two
secondary stage cyclone dust separating units. The two secondary
stage cyclone dust separating units are mounted at opposite lateral
sides, side by side to the primary stage dust collecting chamber.
The primary stage dust collecting chamber in this case is centered
between the two secondary stage cyclone dust separating units and
lateral sides. In other words, the secondary stage cyclone dust
separating units are respectively positioned laterally next to the
primary stage dust collecting chamber which is centered with
respect to the cleaner body.
[0019] In one further embodiment, each secondary stage cyclone dust
separating unit comprises several conical cyclones arranged side to
side in parallel to a respective lateral side.
[0020] Preferably, the diameters of the conical cyclones are
smaller than that of the first stage cyclone dust separator. Note
that the first stage cyclone dust separator preferably has a
constant overall circular cross section, i.e. has essentially no
conical sections. The smaller conical cyclones preferably are
equally dimensioned. Providing smaller conical cyclones in the
secondary stage cyclone dust separating units is effective in
separating fine dust and dust particles too small to be effectively
removed in the primary separation stage.
[0021] It shall be noted, that more than the above described two
dust separation stages may be combined in series. This will enhance
dust separation efficiency and allow blowing out comparatively
clean air to the environment again. As an example, one of the
higher order dust separating steps, e.g. a tertiary dust separation
step, may be a filter type separation, in particular adapted to
retain residual dust particles. But also tertiary stage cyclone
dust separators are conceivable.
[0022] In a yet further embodiment, conical cyclones of the at
least one secondary stage cyclone dust separating unit are mounted
and adapted such that their center axes are tilted or slanted from
top front side to bottom back side. Such a tilted arrangement is of
particular advantage, if a main airflow through the cyclones is
also directed from top front to bottom back. In this case, a
secondary stage dust collecting chamber fluidly connected to dust
outlets of the cyclones can be arranged in a space saving way
underneath and/or in front to back direction behind the respective
secondary stage cyclone dust separating unit.
[0023] In a preferred variant, the center axes of the conical
cyclones are tilted vis-a-vis the horizontal direction of ordinary
use, in more detail vis-a-vis the front to back direction, by an
angle of 10 to 50 degrees, preferably 30 degrees. Such tilt angles
are adequate for compact design, yet allowing sufficient separation
efficiency.
[0024] In a further embodiment, and as already indicated further
above, each secondary stage cyclone dust separating unit comprises
a secondary stage dust collecting chamber downstream of and fluidly
connected with dust outlet openings of respective secondary stage
cyclones.
[0025] The secondary stage dust collecting chambers in particular
may be oriented and mounted as already indicated further above. In
particular, the secondary stage dust collecting chambers may be
located and positioned at respective lateral sides. With regard to
front to back direction, the secondary stage dust collecting
chambers are preferably arranged behind, i.e. downstream, and flush
with respective secondary stage conical cyclones. The proposed
arrangement of the secondary stage dust collecting chamber may lead
to optimal utilization of space, and therefore compact design.
[0026] In another embodiment, with regard to planes running
essentially parallel to a respective lateral side, the secondary
stage dust collecting chamber has a triangular shaped cross
section. Triangular shaped cross sections may provide optimal
utilization of space. In particular due to the fact that a
triangular shaped space may be available downstream and underneath
a dust outlet face or plane of conical cyclones of a secondary
stage cyclone dust separating unit. The dust outlet plane shall be
understood to be defined by respective dust outlet openings of
conical cyclones.
[0027] In a yet further embodiment, a tertiary stage dust
separator, which may be a fine and/or main filter, is provided. The
tertiary stage dust separator is, with regard to front to back
direction, mounted behind the primary dust collecting chamber and
laterally adjacent to the at least one secondary stage dust
collecting chamber. If secondary stage dust collecting chambers are
provided at opposite lateral sides, the tertiary stage dust
separator may be centered in lateral direction between the
secondary stage dust collecting chambers.
[0028] In a further embodiment, the vacuum cleaner comprises air
channels connecting an air outlet of the primary stage cyclone dust
separator to the at least one secondary stage cyclone dust
separating unit, in particular to an air inlet opening of the at
least one secondary stage cyclone dust separating unit. Further,
the air channels are guided at a top side of the cleaner body. This
is favorable with regard to utilization of space.
[0029] Such air channels are of particular advantage if a
longitudinal main axis of the primary stage cyclone dust separator
is oriented essentially parallel to the front to back direction,
and an air outlet of the primary stage cyclone dust separator is
located at or placed towards the back side.
[0030] Each air channel guides at least partially cleaned air from
the primary stage cyclone dust separator to an air inlet, in
particular air inlet chamber, of a respective secondary stage
cyclone dust separating unit. The inlet chamber communicates with
air inlet openings of all conical cyclones of a respective
secondary stage cyclone dust separating unit. The inlet chamber is
designed and adapted such that air is guided optimally, preferably
equally, to and into all conical cyclones of a secondary stage
cyclone dust separating unit.
[0031] In a further embodiment, the primary stage cyclone dust
separator is, with regard to front to back direction, mounted
behind the dust collecting chamber. In this case, it is
advantageous that the primary stage cyclone dust separator is a
horizontal type dust separator. In this connection, a horizontal
type dust separator shall be understood in particular as indicated
further above, i.e. that a longitudinal main axis of the primary
stage cyclone dust collector is parallel to the front to back
direction. This in particular means that a main airflow through the
primary stage cyclone dust separator is parallel and/or
anti-parallel to the front to back direction. Placing and orienting
the primary stage cyclone dust separator as proposed beforehand is
effective in obtaining comparatively small bottom to top
dimensions.
[0032] Exemplary embodiments will now be described in connection
with the annexed figures, in which:
[0033] FIG. 1 shows a perspective view of a vacuum cleaner;
[0034] FIG. 2 shows a lateral side view of the vacuum cleaner;
and
[0035] FIG. 3 shows vertical cross sectional view of the vacuum
cleaner.
[0036] FIG. 1 shows a perspective view of a vacuum cleaner 1. The
vacuum cleaner 1 comprises a horizontal type cleaner body 2 with a
bottom 3, top 4, front 5 and back side 6 and two lateral sides
7.
[0037] The term horizontal type shall mean that in the ordinary and
intended position of use, the cleaner body 2 is positioned
essentially horizontally. In the context of the present invention
and in more general terms this in particular shall mean that, the
cleaner body 2 during normal operation and with regard to front to
back direction is positioned essentially parallel to the ground
underneath. Note that in the figures, the vacuum cleaner is shown
in its ordinary horizontal use position.
[0038] The vacuum cleaner 1 comprises a primary stage cyclone dust
separator 8. The primary stage cyclone dust separator 8 is coupled
to a primary stage dust collecting chamber 9. A dust outlet opening
10 (FIG. 3) of the primary stage cyclone dust separator 8 is
fluidly connected to the primary stage dust collecting chamber
9.
[0039] The primary stage dust collecting chamber 8, which may also
be designated as a dust collecting container, is positioned and
arranged at the front side 5 of the cleaner body 2.
[0040] In a front side section, the primary stage dust collecting
chamber 9 has a fill level indicator, which in the present case is
implemented as a transparent wall section arranged and visible from
the front. In one implementation, essentially the whole primary
stage dust collecting chamber 9, at least walls at the front side,
are made from a transparent material. Here, a user can easily
observe the fill level of the primary stage dust collecting chamber
9, recognize inadequately high filling levels and, as a
consequence, will timely empty the primary stage dust collecting
chamber 9.
[0041] The vacuum cleaner 1 comprises wheels 10 arranged at/in or
on the lateral sides 7 and bottom side 3 of the cleaner body 2,
respectively. The wheels 10 are arranged and adapted such that the
vacuum cleaner 1 during normal and ordinary operation can be easily
moved on the surface underneath. The vacuum cleaner 1 may comprise
other functional elements, such as handles and the like, which will
not be described in further detail.
[0042] At the front side 5 of the vacuum cleaner 1, an interface 11
is provided which is adapted and configured to connect a flexible
suction hose (not shown).
[0043] The vacuum cleaner 1 further comprises two secondary stage
cyclone dust separating units 12. The secondary stage cyclone dust
separating units 12 are positioned and mounted at the front side
5.
[0044] As can in particular be seen from FIG. 1, the primary stage
dust collecting chamber 9 and the secondary stage cyclone dust
separating units 12 are mounted in between the lateral sides 7.
[0045] Further, it can be seen from FIG. 1 that the primary stage
dust collecting chamber 9 and the secondary stage cyclone dust
separating units 12 are, with respect to the lateral extension,
arranged in a side by side arrangement, wherein the primary stage
dust collecting chamber 9 is placed, in particular centered,
between the secondary stage cyclone dust separating units 12. In
other words, at each lateral side of the primary stage dust
collecting chamber 9 there is provided one of the secondary stage
cyclone dust separating units 12.
[0046] From FIG. 1 it can be readily seen that the proposed
arrangement, in particular the arrangement of primary stage dust
collecting chamber 9 and the secondary stage cyclone dust
separating units 12, allows a compact and space saving design.
Further, a functional arrangement combined with good operability of
components of the vacuum cleaner 1 can be obtained.
[0047] Further details of the vacuum cleaner will become apparent
in connection with FIGS. 2 and 3.
[0048] As can be seen in more detail from FIG. 2, representing a
partially broken up side view of the vacuum cleaner 1, each
secondary stage cyclone dust separating unit 12 comprises several
conical cyclones 13. The conical cyclones 13 have equal size, i.e.
dimensions, and are arranged side to side in parallel to a
respective lateral side 7.
[0049] Air channels 14 running at the top side 4 of the cleaner
body 2 fluidly connect an air outlet of the primary stage cyclone
dust separator 8 to respective air inlets of the secondary stage
cyclone dust separating units 12. With the present design, the air
outlet of the primary stage cyclone dust separator 8 is located
towards the back side 6 and centered with respect to the lateral
sides 7. The air channels 14 are guided from a centered back side
location in a curved section towards respective lateral sides 7 and
then are guided along the lateral sides 7 of the cleaner body 2 to
the secondary stage cyclone dust separating units 12. As can be
seen, the air channels 14 can be integrated without increasing the
overall lateral and bottom to top extension of the cleaner body
2.
[0050] The air channels 14 open into the secondary stage cyclone
dust separating units 12. Air guided into the secondary stage
cyclone dust separating units 12 preferably is equally distributed
to the conical cyclones 13. Here, an air distribution chamber
fluidly connected to air inlets of the conical cyclones 13 and
adapted to equally distribute incoming air may be used. If
required, air guiding elements may be provided in the air
distribution chamber.
[0051] With regard to the airflow within the vacuum cleaner 1, the
secondary stage cyclone dust separating units 12 are provided
downstream the primary stage cyclone dust separator 8. This means,
that the primary stage cyclone dust separator 8 and secondary stage
cyclone dust separating units 12 are connected in series. In
particular with reference to FIG. 2 it can be seen that the conical
cyclones 13 of a respective secondary stage cyclone dust separating
unit 12 are connected in parallel.
[0052] With further reference to FIG. 2, the conical cyclones 13
are mounted and aligned such that their center axes are tilted from
top front to bottom back, which is indicated for one of the conical
cyclones by a dotted arrow (v2). In a direction perpendicular to
the center axes, the conical cyclones 13 are positioned in a line,
without axial displacement. This in particular means that air
inlets and dust outlets of the conical cyclones of a secondary
stage cyclone dust separating unit 12 respectively lie in common
planes. As the conical cyclones 13 are of equal design, the air
inlet planes and dust outlet planes are essentially parallel to
each other.
[0053] Coming back to the tilt or declination of the center axes of
the conical cyclones 13, it has been proven advantageous that a
tilt angle .alpha. is in the range of 10 to 50 degrees. A preferred
tilt angle is 30 degrees. Note that the tilt angle shall be
understood to be defined between a vector v1 parallel to the front
to back direction and a vector v2 parallel to a center axis of a
respective conical cyclone 13 and running in a direction top front
to bottom back. Note that the direction top front to bottom back
corresponds to the main air flow direction in respective conical
cyclones 13.
[0054] With further reference to FIG. 2, each secondary stage
cyclone dust separating unit 12 comprises a secondary stage dust
collecting chamber 15 downstream of and fluidly connected to dust
outlet openings 16 of respective conical cyclones 13. In FIG. 2
only one of the secondary stage dust collecting chambers 15 is
visible.
[0055] On a side of a respective secondary step dust collecting
chamber 15 facing the dust outlet openings 16 of the conical
cyclones 13, the secondary step dust collecting chamber 15 has
corresponding dust inlet openings. The dust inlet openings and dust
outlet openings 16 are adapted such that a tight, in particular
fluid and dust tight, connection between secondary step dust
collecting chamber 15 and respective conical cyclones 13 is
obtained.
[0056] The secondary step dust collecting chamber 15 may be
detachably coupled to a section of the secondary stage cyclone dust
separating unit 12, such that it can be easily removed for
discharging dust collected therein, and such that the conical
cyclones 13 can easily be cleaned. It shall however be noted, that
the secondary step dust collecting chamber 15 may alternatively be
a non-detachable integrated part of the secondary stage cyclone
dust separating unit 12. In this case it may be that the secondary
stage cyclone dust separating unit 12 as a whole is detachably
mounted to the cleaner body 2.
[0057] From FIG. 2 it can further be seen, that with regard to
front to back direction each secondary stage dust collecting
chamber 15 is positioned and mounted behind respective secondary
stage cyclones 13. From FIG. 1 it can be seen that with regard to
front to back direction the secondary stage dust collecting
chambers 15 are arranged flush with respective secondary stage
cyclones 13 and respective cyclone units. Optimal and favorable
utilization of space can in particular be obtained if the secondary
stage dust collecting chambers 15, as shown in FIG. 2, have trim
angular shaped cross sections in planes running parallel to the
lateral sides 7.
[0058] The arrangement as described before is advantageous for
obtaining compact overall designs. In addition, the proposed
arrangement allows favorable usability and handling of components
of the vacuum cleaner 1, and of the vacuum cleaner 1 as a
whole.
[0059] With reference to FIG. 3, the vacuum cleaner may comprise a
tertiary stage dust separator 17. Note that even higher order dust
separating stages may be provided. The tertiary stage dust
separator 17 is mounted, with regard to front to back direction,
behind the primary stage dust collecting chamber 9 and with regard
to bottom to top direction below the primary stage cyclone dust
separator 8. In combination with FIG. 2 it becomes clear, that the
tertiary stage dust separator 17 is centered between the secondary
stage dust collecting chambers 15. By this, optimal utilization of
space and compact designs can be obtained.
[0060] The tertiary stage dust separator 17 may be a fine filter,
in particular a main filter, of the vacuum cleaner, and be arranged
immediately upstream an air exhaust of the vacuum cleaner.
[0061] In all, it can be seen, that the proposed vacuum cleaner
provides a compact design, enhanced usability and satisfactory
cleaning efficiency.
LIST OF REFERENCE NUMERALS
[0062] 1 vacuum cleaner [0063] 2 cleaner body [0064] 3 bottom side
[0065] 4 top side [0066] 5 front side [0067] 6 back side [0068] 7
lateral side [0069] 8 primary stage cyclone dust separator [0070] 9
primary stage dust collecting chamber [0071] 10 wheel [0072] 11
interface [0073] 12 secondary stage cyclone dust separating unit
[0074] 13 conical cyclone [0075] 14 air channel [0076] 15 secondary
stage dust collecting chamber [0077] 16 dust outlet opening [0078]
17 tertiary stage dust separator [0079] .alpha. tilt angle [0080]
v1, v2 vectors
* * * * *