NZ628693B2 - Cyclone separation device and electric vacuum cleaner - Google Patents
Cyclone separation device and electric vacuum cleaner Download PDFInfo
- Publication number
- NZ628693B2 NZ628693B2 NZ628693A NZ62869312A NZ628693B2 NZ 628693 B2 NZ628693 B2 NZ 628693B2 NZ 628693 A NZ628693 A NZ 628693A NZ 62869312 A NZ62869312 A NZ 62869312A NZ 628693 B2 NZ628693 B2 NZ 628693B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- inlet
- dust
- bypass
- swirl chamber
- airflow passage
- Prior art date
Links
- 238000000926 separation method Methods 0.000 title claims description 43
- 239000000428 dust Substances 0.000 claims abstract description 297
- 238000011144 upstream manufacturing Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 description 10
- 230000002093 peripheral Effects 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 6
- 230000000630 rising Effects 0.000 description 5
- 230000003247 decreasing Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L5/00—Structural features of suction cleaners
- A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
- A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
- A47L5/36—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back
- A47L5/365—Suction cleaners with hose between nozzle and casing; Suction cleaners for fixing on staircases; Suction cleaners for carrying on the back of the vertical type, e.g. tank or bucket type
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/0081—Means for exhaust-air diffusion; Means for sound or vibration damping
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
- A47L9/1608—Cyclonic chamber constructions
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
- A47L9/165—Construction of inlets
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
- A47L9/1658—Construction of outlets
- A47L9/1666—Construction of outlets with filtering means
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
- A47L9/16—Arrangement or disposition of cyclones or other devices with centrifugal action
- A47L9/1683—Dust collecting chambers; Dust collecting receptacles
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
- A47L9/22—Mountings for motor fan assemblies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
- B04C5/04—Tangential inlets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
- B04C5/185—Dust collectors
Abstract
dust collection unit is provided with a swirl chamber (29), dust collection chambers (30, 31), a discharge pipe (57), an inlet pipe (35), a bypass inlet opening (41), and a bypass inlet air flow passage (28). The swirl chamber (29) swirls dust-containing air along the side wall and separates dust from the dust-containing air, the dust containing air having entered from a primary inlet opening (40) and from a secondary inlet opening (42) which has a smaller opening area than the primary inlet opening (40). The dust separated by the swirl chamber (29) is captured by the dust collection chambers (30, 31). A discharge opening (54) is formed in the discharge pipe (51). The inlet pipe (35) allows the dust-containing air to flow from the primary inlet opening (40) to the swirl chamber (29). The bypass inlet opening (41) is formed in the inlet pipe (35). The bypass inlet air flow passage (28) allows the dust-containing air within the inlet pipe (35), the dust-containing air having flowed from the bypass inlet opening (41), to flow from the secondary inlet opening (42) to the swirl chamber (29). from the dust-containing air, the dust containing air having entered from a primary inlet opening (40) and from a secondary inlet opening (42) which has a smaller opening area than the primary inlet opening (40). The dust separated by the swirl chamber (29) is captured by the dust collection chambers (30, 31). A discharge opening (54) is formed in the discharge pipe (51). The inlet pipe (35) allows the dust-containing air to flow from the primary inlet opening (40) to the swirl chamber (29). The bypass inlet opening (41) is formed in the inlet pipe (35). The bypass inlet air flow passage (28) allows the dust-containing air within the inlet pipe (35), the dust-containing air having flowed from the bypass inlet opening (41), to flow from the secondary inlet opening (42) to the swirl chamber (29).
Description
DESCRIPTION
Title of Invention: CYCLONE SEPARATION DEVICE AND ELECTRIC VACUUM
CLEANER
Technical Field
The present invention relates to a cyclone separation device, and an electric
vacuum cleaner including the cyclone separation device.
Background Art
Patent Literature 1 mentioned below describes an electric vacuum cleaner
including a cyclone separation device. In the cyclone separation device described in
Patent Literature 1, two openings are formed in a cylindrical container, and air is taken
from the two openings into the container (for example, see Figure 8 in Patent Literature
In the cyclone separation device having such a configuration, areas of the
openings must be reduced to ensure a flow velocity of air flowing into the container.
Thus, the openings and airflow passages leading to the openings may be clogged with
dust.
The cyclone separation device described in Patent Literature 1 includes another
device having a cyclone separation function and provided on an upstream side of the
container in order to prevent the openings and the airflow passages from being clogged
with dust. That is, the cyclone separation device described in Patent Literature 1 uses
the device to previously remove large dust, and takes air from which the large dust is
removed into the container.
Citation list
Patent Literature
Patent Literature 1: Japanese Patent Laid-Open No. 5-176871
Technical Problem
The cyclone separation device described in Patent Literature 1 requires a device
for previously removing large dust, which increases a size of the entire cyclone
separation device.
The present invention is achieved to solve the problems such as the one described
above, and has an object to provide a cyclone separation device that can increase dust
separation performance and reduce noise without increasing a size of the device, and an
electric vacuum cleaner including such a cyclone separation device.
This and other stated objects are objects of at least preferred embodiments of the
invention, and the stated objects should not be considered to limit the scope of the
claimed invention.
Summary of Invention
A cyclone separation device of the present invention is a device which comprises
a swirl chamber that swirls, along a side wall thereof, dust-containing air entered from a
primary inlet and a secondary inlet of the swirl chamber, and separates dust from the
dust-containing air, a dust collection chamber that collects the dust separated by the swirl
chamber, a discharge pipe having a discharge opening for discharging air in the swirl
chamber, an inlet pipe that allows the dust-containing air to flow from the primary inlet
into the swirl chamber, a bypass inlet that opens in an inner wall of the inlet pipe, and a
bypass inlet airflow passage that allows the dust-containing air to enter thereinto from the
bypass inlet and to flow from the secondary inlet into the swirl chamber.
[0009a]
An electric vacuum cleaner of the present invention is a cleaner which comprises
the cyclone separation device, and an air blower for generating a predetermined airflow
in the cyclone separation device.
[0009b]
Preferably, the secondary inlet has an opening area smaller than an opening area
of the primary inlet of the swirl chamber.
Advantageous Effects of Invention
According to at least preferred embodiments of the present invention, the cyclone
separation device and the electric vacuum cleaner including the cyclone separation device
can increase dust separation performance and reduce noise without increasing a size of
the device.
Brief Description of Drawing
Figure 1 is a perspective view showing an electric vacuum cleaner according to
Embodiment 1 of the present invention.
Figure 2 is a perspective view showing a vacuum cleaner body of the electric
vacuum cleaner according to Embodiment 1 of the present invention.
Figure 3 is a plan view showing the vacuum cleaner body of the electric vacuum
cleaner according to Embodiment 1 of the present invention.
Figure 4 is a perspective view showing a housing unit of the electric vacuum
cleaner according to Embodiment 1 of the present invention.
Figure 5 is a plan view of the housing unit of the electric vacuum cleaner
according to Embodiment 1 of the present invention.
Figure 6 is an A-A sectional view of the housing unit shown in Figure 5.
Figure 7 is a B-B sectional view of the housing unit shown in Figure 5.
Figure 8 is a perspective view showing a dust collection unit of the electric
vacuum cleaner according to Embodiment 1 of the present invention.
Figure 9 is a side view showing the dust collection unit of the electric vacuum
cleaner according to Embodiment 1 of the present invention.
Figure 10 is a plan view showing the dust collection unit of the electric vacuum
cleaner according to Embodiment 1 of the present invention.
Figure 11 is a C-C sectional view of the dust collection unit in Figure 10.
Figure 12 is a D-D sectional view of the dust collection unit in Figure 10.
Figure 13 is an E-E sectional view of the dust collection unit in Figure 11.
Figure 14 is an F-F sectional view of the dust collection unit in Figure 11.
Figure 15 is a G-G sectional view of the dust collection unit in Figure 11.
Figure 16 is an exploded view of the dust collection unit of the electric vacuum
cleaner according to Embodiment 1 of the present invention.
Figure 17 is a plan view showing a bypass portion case in the dust collection unit
of the electric vacuum cleaner according to Embodiment 1 of the present invention.
Figure 18 is a plan view showing an inlet portion case in the dust collection unit of
the electric vacuum cleaner according to Embodiment 1 of the present invention.
Figure 19 is an H-H sectional view of the vacuum cleaner body of the electric
vacuum cleaner in Figure 3.
Figure 20 is a J-J sectional view of the vacuum cleaner body of the electric
vacuum cleaner in Figure 3.
Figure 21 is a plan view showing a bypass portion case in a dust collection unit of
an electric vacuum cleaner according to Embodiment 2 of the present invention.
Figure 22 is a plan view showing an inlet portion case in the dust collection unit of
the electric vacuum cleaner according to Embodiment 2 of the present invention.
Figure 23 is a plan view showing a dust collection unit of an electric vacuum
cleaner according to Embodiment 3 of the present invention.
Figure 24 is a K-K sectional view of the dust collection unit in Figure 23.
Figure 25 is a perspective view showing a dust collection unit of an electric
vacuum cleaner according to Embodiment 4 of the present invention.
Figure 26 is a side view showing the dust collection unit of the electric vacuum
cleaner according to Embodiment 4 of the present invention.
Figure 27 is a front view showing the dust collection unit of the electric vacuum
cleaner according to Embodiment 4 of the present invention.
Figure 28 is a plan view showing the dust collection unit of the electric vacuum
cleaner according to Embodiment 4 of the present invention.
Figure 29 is an L-L sectional view of the dust collection unit in Figure 28.
Figure 30 is an M-M sectional view of the dust collection unit in Figure 28.
Figure 31 is an N-N sectional view of the dust collection unit in Figure 29.
Figure 32 is a plan view showing a bypass portion case in the dust collection unit
of the electric vacuum cleaner according to Embodiment 4 of the present invention.
Figure 33 is a plan view showing an inlet portion case in the dust collection unit of
the electric vacuum cleaner according to Embodiment 4 of the present invention.
Description of Embodiments
The present invention will be described in detail with reference to the attached
drawings. In the drawings, the same or corresponding components are denoted by the
same reference numerals. Redundant descriptions are appropriately simplified or
omitted.
Embodiment 1
Figure 1 is a perspective view showing an electric vacuum cleaner according to
Embodiment 1 of the present invention.
As shown in Figure 1, essential portions of the electric vacuum cleaner 1 includes
a suction opening body 2, a suction pipe 3, a connection pipe 4, a suction hose 5, and a
vacuum cleaner body 6.
The suction opening body 2 sucks dust on a floor surface with air from an opening
formed downward. The suction opening body 2 includes a connection portion for
exhausting air in a longitudinally middle portion.
The suction pipe 3 is formed of a straight cylindrical member. An end on one
side (intake side) of the suction pipe 3 is connected to the connection portion of the
suction opening body 2.
The connection pipe 4 is formed of a cylindrical member bent in the middle. An
end on one side (intake side) of the connection pipe 4 is connected to the other end of the
suction pipe 3. A handle 7 is provided on the connection pipe 4. The handle 7 is
gripped and operated by a person who is cleaning. The handle 7 has an operation switch
8 for controlling operation of the electric vacuum cleaner 1.
The suction hose 5 is formed of a flexible bellows member. An end on one side
(intake side) of the suction hose 5 is connected to the other end of the connection pipe 4.
The vacuum cleaner body 6 separates dust from air containing dust (dust-
containing air), and discharges air (clean air) from which the dust is removed (for
example, returns the air to a room). The vacuum cleaner body 6 has a hose connection
opening 9 in a front end. The other end of the suction hose 5 is connected to the hose
connection opening 9 in the vacuum cleaner body 6.
The vacuum cleaner body 6 includes an electric air blower 10 (not shown in
Figure 1), and a power cord 11. The power cord 11 is wound around a cord reel (not
shown) in the vacuum cleaner body 6. The power cord 11 is connected to an external
power source to energize internal devices such as the electric air blower 10. The electric
air blower 10 is driven by energization to perform predetermined suction depending on
operation of the operation switch 8.
Insides of the suction opening body 2, the suction pipe 3, the connection pipe 4,
and the suction hose 5 are continuously formed. When the electric air blower 10
performs suction, dust on the floor surface is sucked with air into the suction opening
body 2. Dust-containing air sucked into the suction opening body 2 is fed through the
suction opening body 2, the suction pipe 3, the connection pipe 4, and the suction hose 5
to the vacuum cleaner body 6. As such, the suction opening body 2, the suction pipe 3,
the connection pipe 4, and the suction hose 5 form an airflow passage for allowing dust-
containing air to flow into the vacuum cleaner body 6 from outside.
Figure 2 is a perspective view showing the vacuum cleaner body of the electric
vacuum cleaner according to Embodiment 1 of the present invention. Figure 3 is a plan
view showing the vacuum cleaner body of the electric vacuum cleaner according to
Embodiment 1 of the present invention.
The vacuum cleaner body 6 includes a housing unit 12 and a dust collection unit
13. The housing unit 12 houses various devices other than the dust collection unit 13.
The dust collection unit 13 is removably provided on the housing unit 12.
Figure 4 is a perspective view showing the housing unit of the electric vacuum
cleaner according to Embodiment 1 of the present invention. Figure 5 is a plan view of
the housing unit of the electric vacuum cleaner according to Embodiment 1 of the present
invention. Figures 4 and 5 show the state in which the dust collection unit 13 is
removed from the housing unit 12. Figure 6 is an A-A sectional view of the housing
unit shown in Figure 5. Figure 7 is a B-B sectional view of the housing unit shown in
Figure 5.
The housing unit 12 includes the devices described above, and also housing bodies
14 and 15, an intake airflow passage forming portion 16, an exhaust airflow passage
forming portion 17, and wheels 18.
The housing body 14 is formed of a box-like member (for example, a molded
component) with openings on front and upper sides. The electric air blower 10 and the
cord reel are housed in the housing body 14. A portion from a rear end to a
predetermined position closer to a front side of the housing body 14 has an inclined upper
surface with a higher rear side and a lower front side. A portion on a front side of the
predetermined position of the housing body 14 has an inclined upper surface with a lower
rear side and a higher front side.
The housing body 15 is provided on the housing body 14 so as to close the
openings formed in the housing body 14. An upper surface near the front end of the
housing body 14 faces obliquely rearward, and an upper surface of the other portion faces
obliquely forward. Thus, the housing body 15 is partially formed into an L shape on
side view in accordance with the shape of the upper surfaces of the housing body 14.
The L-shaped portion of the housing body 15 forms a housing portion 15a thereon. The
housing portion 15a includes a space for housing the dust collection unit 13. When the
dust collection unit 13 is properly mounted to the housing unit 12, essential portions of
the dust collection unit 13 are placed in the housing portion 15a, that is, on the housing
body 15 (housing unit 12).
The intake airflow passage forming portion 16 forms an intake airflow passage 19
for leading dust-containing air to the dust collection unit 13 in the vacuum cleaner body 6.
The intake airflow passage forming portion 16 has one end opening in a front surface of
the vacuum cleaner body 6. The intake airflow passage forming portion 16 passes
through an internal space of the housing body 14, and has the other end opening in an
upper surface (housing body 15) of the housing unit 12. The one end of the intake
airflow passage forming portion 16 forms the hose connection opening 9. The other end
of the intake airflow passage forming portion 16 forms a connection opening 20 to the
dust collection unit 13. The connection opening 20 is placed closer to the rear end and
one side on the upper surface of the housing unit 12.
The dust collection unit 13 separates dust from the dust-containing air, and
temporarily stores the separated dust. The dust collection unit 13 swirls the dust-
containing air therein to separate dust from air by a centrifugal force. That is, the dust
collection unit 13 has a cyclone separation function.
A specific configuration and function of the dust collection unit 13 will be
described later.
The exhaust airflow passage forming portion 17 forms an exhaust airflow passage
21 for leading air discharged from the dust collection unit 13 (clean air from which dust
is removed by the dust collection unit 13) to an exhaust opening (not shown) in the
vacuum cleaner body 6. One end of the exhaust airflow passage forming portion 17
opens in the upper surface (housing body 15) of the housing unit 12. The exhaust
airflow passage forming portion 17 passes through the internal space of the housing body
14, and has the other end opening outward of the housing unit 12. The one end of the
exhaust airflow passage forming portion 17 forms a connection opening 22 to the dust
collection unit 13. The other end of the exhaust airflow passage forming portion 17
forms an exhaust opening. The connection opening 22 is placed in a middle closer to
the rear end on the upper surface of the housing unit 12.
The electric air blower 10 generates an air flow in airflow passages formed in the
electric vacuum cleaner 1 (an airflow passage for allowing dust-containing air to flow
into the vacuum cleaner body 6, the intake airflow passage 19, an airflow passage in the
dust collection unit 13 described later, and the exhaust airflow passage 21). The electric
air blower 10 is placed in the exhaust airflow passage 21 in a predetermined position
closer to the rear end of the housing unit 12.
When the electric air blower 10 starts suction, an airflow (suction air) is generated
in the airflow passages formed in the electric vacuum cleaner 1. The dust-containing air
sucked into the suction opening body 2 is taken from the hose connection opening 9 into
the vacuum cleaner body 6. The dust-containing air having flowed into the vacuum
cleaner body 6 is fed through the intake airflow passage 19 from the connection opening
to the dust collection unit 13. The airflow generated in the dust collection unit 13
will be described later. The air (clean air) discharged from the dust collection unit 13
flows into the exhaust airflow passage 21, and passes through the electric air blower 10 in
the exhaust airflow passage 21. The air having passed through the electric air blower 10
further travels through the exhaust airflow passage 21, and is discharged from the exhaust
opening to the outside of the vacuum cleaner body 6 (electric vacuum cleaner 1).
Next, also with reference to Figures 8 to 18, the dust collection unit 13 will be
described in detail.
Figure 8 is a perspective view showing the dust collection unit of the electric
vacuum cleaner according to Embodiment 1 of the present invention. Figure 9 is a side
view showing the dust collection unit of the electric vacuum cleaner according to
Embodiment 1 of the present invention. Figure 10 is a plan view showing the dust
collection unit of the electric vacuum cleaner according to Embodiment 1 of the present
invention. Figure 11 is a C-C sectional view of the dust collection unit in Figure 10.
Figure 12 is a D-D sectional view of the dust collection unit in Figure 10. Figure 13 is
an E-E sectional view of the dust collection unit in Figure 11. Figure 14 is an F-F
sectional view of the dust collection unit in Figure 11. Figure 15 is a G-G sectional
view of the dust collection unit in Figure 11. Figure 16 is an exploded view of the dust
collection unit of the electric vacuum cleaner according to Embodiment 1 of the present
invention.
The dust collection unit 13 generally has a substantially cylindrical shape. The
dust collection unit 13 includes a discharge portion case 23, a bypass portion case 24, an
inlet portion case 25, and a dust collection portion case 26.
Figure 17 is a plan view showing the bypass portion case in the dust collection
unit of the electric vacuum cleaner according to Embodiment 1 of the present invention.
Figure 18 is a plan view showing the inlet portion case in the dust collection unit of the
electric vacuum cleaner according to Embodiment 1 of the present invention.
In the descriptions on the dust collection unit 13 below, upper and lower sides are
specified with reference to the direction in Figure 9.
The discharge portion case 23, the bypass portion case 24, the inlet portion case 25,
and the dust collection portion case 26 are formed of, for example, molded components.
The discharge portion case 23, the bypass portion case 24, the inlet portion case 25, and
the dust collection portion case 26 are configured to be disassembled into a state in
Figure 16 and assembled into a state in Figure 8 by predetermined operation (for example,
operation of a lock mechanism). Also, only the dust collection portion case 26 may be
removed from the state in Figure 8.
Any one or more of the cases 23 to 26 are properly placed, and thus an inlet
airflow passage 27, a bypass inlet airflow passage 28, a swirl chamber 29, a zero-order
dust collection chamber 30, a primary dust collection chamber 31, and an outlet airflow
passage 32 are formed in the dust collection unit 13.
The inlet portion case 25 includes a cylindrical portion 33, a conical portion 34, an
inlet pipe 35, a bypass airflow passage forming portion 36, and a connection portion 37.
The cylindrical portion 33 has a hollow cylindrical shape. The cylindrical
portion 33 is placed so that a central axis thereof is vertically directed. The conical
portion 34 has a hollow truncated conical shape. The conical portion 34 is vertically
placed so that a central axis thereof matches the central axis of the cylindrical portion 33.
An upper end of the conical portion 34 is connected to a lower end of the cylindrical
portion 33, and the conical portion 34 is provided to extend downward from the lower
end of the cylindrical portion 33 with a diameter decreasing downward. Thus, a lower
end of the conical portion 34 opens downward (toward the central axis). The opening
formed in the lower end of the conical portion 34 is a primary opening 38.
A continuous space formed by an internal space of the cylindrical portion 33 and
an internal space of the conical portion 34 constitutes the swirl chamber 29. The swirl
chamber 29 is a space for swirling dust-containing air.
The inlet pipe 35 leads dust-containing air having passed through the intake
airflow passage 19 into the inside of the cylindrical portion 33 (swirl chamber 29). An
internal space of the inlet pipe 35 forms the inlet airflow passage 27. The inlet airflow
passage 27 is one of the airflow passages for allowing dust-containing air to flow from
the intake airflow passage 19 into the swirl chamber 29.
The inlet pipe 35 has, for example, a hollow square shape and is connected to the
cylindrical portion 33. The inlet pipe 35 has one end opening outward, and the other
end opening inside the cylindrical portion 33. The one end of the inlet pipe 35 forms a
unit inlet 39 for taking the dust-containing air into the dust collection unit 13. The other
end of the inlet pipe 35 forms a primary inlet 40 for taking the dust-containing air having
passed through the inlet airflow passage 27 into the inside of the cylindrical portion 33
(swirl chamber 29).
The inlet pipe 35 is connected to an upper portion of the cylindrical portion 33.
Thus, the primary inlet 40 is formed in the upper portion of the cylindrical portion 33 (an
uppermost portion of a side wall that forms the swirl chamber 29). The inlet pipe 35 is
formed of a straight member. The inlet pipe 35 has an axis perpendicular to the central
axis of the cylindrical portion 33, and placed tangentially of the cylindrical portion 33.
A square opening communicating with the internal space (inlet airflow passage
27) is formed in an upper surface of the inlet pipe 35. The opening provided in an upper
wall that forms the inlet airflow passage 27 is a bypass inlet 41. The bypass inlet 41 is
an opening for taking a part of the dust-containing air in the inlet airflow passage 27 into
the bypass inlet airflow passage 28. The dust collection unit 13 includes the inlet
airflow passage 27, and also the bypass inlet airflow passage 28, as airflow passages for
allowing the dust-containing air to flow from the intake airflow passage 19 into the swirl
chamber 29.
The bypass inlet airflow passage 28 is formed by parts of the discharge portion
case 23, the bypass portion case 24, and the inlet portion case 25. The dust-containing
air having been discharged from the intake airflow passage 19 through the bypass inlet 41
(that is, having flowed into the bypass inlet airflow passage 28) passes through the bypass
inlet airflow passage 28, and is then taken from a secondary inlet 42 into the inside of the
cylindrical portion 33 (swirl chamber 29).
The bypass airflow passage forming portion 36 is provided on an upper portion of
the cylindrical portion 33 so as to surround the cylindrical portion 33. The bypass
portion case 24 is placed on an upper surface of the bypass airflow passage forming
portion 36 in close contact therewith. Thus, the upper surface of the bypass airflow
passage forming portion 36 is formed to be flat. Also, a rising portion 43 for
determining a mounting direction of the bypass portion case 24 is provided at an edge of
the upper surface of the bypass airflow passage forming portion 36.
The bypass airflow passage forming portion 36 has three grooves 44 opening
upward. The groove 44 is formed along an outer peripheral surface of the cylindrical
portion 33 outside the cylindrical portion 33. The groove 44 is formed so that one end
side is closer to the cylindrical portion 33 in a direction of the dust-containing air swirling
in the swirl chamber 29 (swirl direction). One end of the groove 44 opens in the
cylindrical portion 33.
The bypass portion case 24 is placed on the bypass airflow passage forming
portion 36 to close the upper side of the groove 44, thereby forming a part (rear half) of
the bypass inlet airflow passage 28. Also, the bypass portion case 24 is placed on the
bypass airflow passage forming portion 36 to close the upper side of the opening at one
end of the groove 44, thereby forming the secondary inlet 42. In this embodiment, the
three grooves 44 are formed, and thus three secondary inlets 42 are provided in the side
wall that forms the swirl chamber 29.
The secondary inlet 42 is formed in the upper portion of the cylindrical portion 33
(uppermost portion of the side wall that forms the swirl chamber 29) like the primary
inlet 40. For example, the secondary inlet 42 is placed at the same height as the primary
inlet 40. The secondary inlet 42 is formed to have an opening area smaller than an
opening area of the primary inlet 40. One end side of the groove 44 is obliquely
connected to the cylindrical portion 33 so that the dust-containing air from the bypass
inlet airflow passage 28 tangentially flows into the inside of the cylindrical portion 33.
The connection portion 37 is provided to protrude outward from the cylindrical
portion 33. The connection portion 37 generally has a ring shape. The connection
portion 37 is placed at a substantially intermediate height of the cylindrical portion 33.
The dust collection portion case 26 includes a bottom 45, an outer wall portion 46,
and a partition portion 47.
The bottom 45 generally has a circular shape. The outer wall portion 46 has a
cylindrical shape having a diameter larger than a diameter of the cylindrical portion 33.
The outer wall portion 46 is provided to stand upright from an edge of the bottom 45.
That is, the outer wall portion 46 and the bottom 45 form a cylindrical member with one
side (lower side) being closed. The partition portion 47 has a cylindrical shape having a
diameter smaller than a diameter of the cylindrical portion 33. The partition portion 47
is placed inside the outer wall portion 46, and provided to stand upright from an upper
surface of the bottom 45. Thus, two spaces partitioned by the partition portion 47 are
formed in the dust collection portion case 26.
When the dust collection portion case 26 is placed so that the conical portion 34 is
inserted from above into a space inside the partition portion 47, an upper end of the
partition portion 47 comes into contact with an outer peripheral surface (or a member
provided on the outer peripheral surface) of the conical portion 34 from below. The space
formed inside the partition portion 47 other than the conical portion 34 forms the primary
dust collection chamber 31. The primary dust collection chamber 31 communicates
with the swirl chamber 29 through the primary opening 38. A part of dust separated
from the dust-containing air in the swirl chamber 29 falls through the primary opening 38
into the primary dust collection chamber 31 and is collected. The primary dust
collection chamber 31 is placed to cover a lower side of the conical portion 34 (lower
portion of the swirl chamber 29), and surrounds the lower side.
When the dust collection portion case 26 is placed so that the conical portion 34 is
inserted from above into the space inside the partition portion 47, the upper end of the
outer wall portion 46 comes into contact with the edge of the connection portion 37 from
below. A continuous cylindrical space formed between the outer wall portion 46 and
the partition portion 47 as well as between the outer wall portion 46 and parts of the
cylindrical portion 33 and the conical portion 34 forms the zero-order dust collection
chamber 30. An upper side of the continuous space is closed by the connection portion
37, and a lower side thereof is closed by the bottom 45. The zero-order dust collection
chamber 30 is placed to surround the lower portion of the cylindrical portion 33 and the
conical portion 34 (that is, most of the swirl chamber 29), and further surround the
primary dust collection chamber 31.
A zero-order opening 48 is provided in the side wall that forms the swirl chamber
29. The swirl chamber 29 communicates with the zero-order dust collection chamber 30
through the zero-order opening 48. The zero-order opening 48 is formed in a position
lower than the primary inlet 40 and the secondary inlet 42 (downstream side) and a
position higher than the primary opening 38 (upstream side). For example, the zero-
order opening 48 is provided from the lower end of the cylindrical portion 33 to the upper
end of the conical portion 34, and placed in a slightly lower position than the connection
portion 37. The zero-order opening 48 is placed near the uppermost portion of the zero-
order dust collection chamber 30. Thus, the zero-order dust collection chamber 30 is
provided to extend downward from the zero-order opening 48.
The bypass portion case 24 includes a bottom 49, a side wall portion 50, and a
discharge portion 51.
As described above, the bypass portion case 24 is placed on the bypass airflow
passage forming portion 36 in close contact therewith from above. The bottom 49 has a
plate shape, and an outline of the plate shape fits an inner surface of the rising portion 43.
When the bypass portion case 24 is properly placed on the inlet portion case 25,
the bottom 49 is placed to close the upper side of the cylindrical portion 33. That is, an
upper wall of the swirl chamber 29 is formed by the bottom 49. Also, when the bypass
portion case 24 is properly placed on the inlet portion case 25, the bottom 49 is placed to
close the upper side of the groove 44. That is, an upper wall of the rear half of the
bypass inlet airflow passage 28 and an upper edge of the secondary inlet 42 are formed
by the bottom 49.
The side wall portion 50 is provided to stand upright from the bottom 49. The
side wall portion 50 is continuously formed to surround a C-shaped space on the bottom
49 (when viewed in a direction of the central axis of the swirl chamber 29). The bypass
portion case 24 is covered with the discharge portion case 23 from above. The C-
shaped space with a lower side being closed by the bottom 49 and a lateral side
surrounded by the side wall portion 50 forms a part (front half) of the bypass inlet airflow
passage 28 by the discharge portion case 23 being placed on the bypass portion case 24 to
close an upper side of the space.
The bottom 49 has a first bypass opening 52 and a second bypass opening 53.
The first bypass opening 52 and the second bypass opening 53 are provided in a portion
surrounded by the side wall portion 50 on the bottom 49.
The first bypass opening 52 is an opening for taking the dust-containing air in the
inlet airflow passage 27 (that is, the dust-containing air having passed through the bypass
inlet 41) into the C-shaped space (the front half of the bypass inlet airflow passage 28).
The first bypass opening 52 is formed into, for example, the same shape as the bypass
inlet 41. When the bypass portion case 24 is properly mounted to the inlet portion case
, the first bypass opening 52 is placed in the same position as the bypass inlet 41 when
viewed in the direction of the central axis of the swirl chamber 29. That is, the first
bypass opening 52 is placed immediately above the bypass inlet 41.
The second bypass opening 53 is an opening for taking the dust-containing air in
the C-shaped space into the rear half of the bypass inlet airflow passage 28. The second
bypass openings 53 of, for example, the same number as the secondary inlets 42 are
provided. In this embodiment, three secondary inlets 42 (three grooves 44) are provided.
Thus, the bottom 49 has three second bypass openings 53 correspondingly to the
secondary inlets 42 (grooves 44). When the bypass portion case 24 is properly mounted
to the inlet portion case 25, the second bypass opening 53 is placed immediately above
the other end of the groove 44 (an end on the side opposite from the side with the
secondary inlet 42).
The discharge portion 51 discharges air in the swirl chamber 29 to the outside of
the swirl chamber 29. An internal space of the discharge portion 51 forms a part (front
half) of the outlet airflow passage 32 for allowing the air in the swirl chamber 29 to flow
out of the dust collection unit 13.
The discharge portion 51 is provided in a middle of the bottom 49. The
discharge portion 51 extends through the bottom 49 (opens in the upper surface of the
bottom 49), and protrudes downward from the bottom 49. When the bypass portion
case 24 is properly mounted to the inlet portion case 25, the discharge portion 51 is
placed to protrude into the swirl chamber 29 from the upper wall of the swirl chamber 29.
An upper portion of the discharge portion 51 from a predetermined intermediate
position has a cylindrical shape. A lower portion of the discharge portion 51 from the
intermediate position has a hollow conical shape with a diameter decreasing downward.
The discharge portion 51 is vertically placed so that a central axis thereof matches the
central axis of the cylindrical portion 33. Thus, the swirl chamber 29, the zero-order
dust collection chamber 30, the primary dust collection chamber 31, and the internal
space of the discharge portion 51 (front half of the outlet airflow passage 32) are
substantially concentrically placed in the dust collection unit 13. The lower end of the
discharge portion 51 is placed at the same height as, for example, a part (upper portion)
of the zero-order opening 48.
The discharge portion 51 has many micropores. The micropores form a
discharge opening 54 for discharging air in the swirl chamber 29 to the outside of the
swirl chamber 29 (taking the air into the outlet airflow passage 32). The discharge
opening 54 is provided in a higher position than the zero-order opening 48. The
discharge opening 54 is also placed at the same height as the primary inlet 40 and the
secondary inlet 42. The discharge opening 54 is not formed in a portion of the
discharge portion 51 that the primary inlet 40 directly faces. The discharge opening 54
is formed in a portion of the discharge portion 51 that the secondary inlet 42 directly
faces.
The discharge portion case 23 is formed of a case body placed on the uppermost
portion of the dust collection unit 13. The discharge portion case 23 includes a lid 55
and a discharge portion 56.
When the discharge portion case 23 is properly placed on the bypass portion case
24, the lid 55 is placed to close from above the C-shaped space surrounded by the side
wall portion 50. That is, the upper wall of the front half of the bypass inlet airflow
passage 28 is formed by the lid 55.
An edge of the lid 55 has the same shape as the rising portion 43. Thus, the
discharge portion case 23 is mounted to the bypass portion case 24 (inlet portion case 25)
in one fixed direction.
The discharge portion 56 switches a traveling direction of the air having passed
through the discharge portion 51 to discharge the air to the outside of the dust collection
unit 13. An internal space of the discharge portion 56 forms a part (rear half) of the
outlet airflow passage 32. A discharge pipe 57 includes the discharge portion 51 of the
bypass portion case 24, and the discharge portion 56 of the discharge portion case 23.
The discharge portion 56 has a cylindrical shape bent into an L shape. The
discharge portion 56 has one end opening downward, and the other end opening laterally.
When the discharge portion case 23 is properly placed on the bypass portion case 24, one
end of the discharge portion 56 is connected to the upper end of the discharge portion 51.
An axial direction of the other end of the discharge portion 56 is placed orthogonally to
the central axis of the swirl chamber 29 and in parallel with an axial direction of the inlet
pipe 35. The other end of the discharge portion 56 forms a unit outlet 58 for allowing
air to flow out of the dust collection unit 13. The unit outlet 58 opens in the same
direction as the unit inlet 39. The unit outlet 58 is placed in a higher position than the
unit inlet 39.
When the dust collection unit 13 having the above described configuration is
properly mounted to the housing unit 12, the central axis of the swirl chamber 29 and the
like is obliquely placed along an inclined surface (upper surface) of the housing body 15.
Then, the unit inlet 39 and the unit outlet 58 are placed to face the inclined surface, and
the unit inlet 39 is connected to the connection opening 20. The unit outlet 58 is
connected to the connection opening 22.
Figure 19 is an H-H sectional view of the vacuum cleaner body of the electric
vacuum cleaner in Figure 3. Figure 20 is a J-J sectional view of the vacuum cleaner
body of the electric vacuum cleaner in Figure 3. Figures 19 and 20 show the dust
collection unit 13 being properly mounted to the housing unit 12.
Next, a function of the dust collection unit 13 having the above described
configuration will be specifically described.
When the electric air blower 10 starts suction, the dust-containing air passes
through the intake airflow passage 19 and reaches the connection opening 20 as described
above. The dust-containing air successively passes through the connection opening 20
and the unit inlet 39, and flows into the inside of the inlet pipe 35, that is, into the inlet
airflow passage 27. A part of the dust-containing air having flowed into the inlet
airflow passage 27 travels in the axial direction of the inlet pipe 35 (travels straight), and
reaches a terminal (the other end) of the inlet pipe 35. The dust-containing air having
reached the terminal of the inlet pipe 35 passes through the primary inlet 40 and flows
into the inside of the cylindrical portion 33 (swirl chamber 29). Such a path is shown as
a path a by a solid arrow in the figures.
Meanwhile, the other part of the dust-containing air having flowed into the inlet
airflow passage 27 enters a different path (path b shown by a broken arrow in the figures)
in the middle of the path a.
Specifically, a part of the dust-containing air flowing through the inlet airflow
passage 27 changes its traveling direction from the axial direction of the inlet pipe 35 to
an upward direction, and reaches the bypass inlet 41. The dust-containing air
successively passes through the bypass inlet 41 and the first bypass opening 52, and
flows into a space between the bypass portion case 24 and the discharge portion case 23
(that is, the front half of the bypass inlet airflow passage 28) above the inlet portion case
The dust-containing air having flowed into the bypass inlet airflow passage 28
moves in the C-shaped space surrounded by the side wall portion 50, and reaches the
second bypass opening 53. In the C-shaped space, the dust-containing air moves in the
swirl direction of the air in the swirl chamber 29 across the upper portion of the swirl
chamber 29. The dust-containing air passes through the second bypass opening 53 and
moves downward, and flows into a space between the bypass airflow passage forming
portion 36 and the bottom 49 formed outside the swirl chamber 29, that is, into the
groove 44 (rear half of the bypass inlet airflow passage 28).
The dust-containing air having flowed into the rear half of the bypass inlet airflow
passage 28 moves in the groove 44. In the groove 44, the dust-containing air moves in
the swirl direction of the air in the swirl chamber 29. When reaching one end of the
groove 44, the dust-containing air passes through the secondary inlet 42 and flows into
the inside of the cylindrical portion 33 (swirl chamber 29).
The dust-containing air having passed through the primary inlet 40 tangentially
flows into the swirl chamber 29 along an inner peripheral surface of the cylindrical
portion 33 (inner wall surface of the swirl chamber 29). The dust-containing air having
passed through the secondary inlet 42 also tangentially flows into the swirl chamber 29
along the inner peripheral surface of the cylindrical portion 33.
The dust-containing air taken from the primary inlet 40 and the secondary inlet 42
into the swirl chamber 29 forms a swirl airflow that turns in a predetermined direction
along the side wall in the swirl chamber 29. The swirl airflow flows downward by a
path structure and gravity thereof while forming a forced vortex region near the central
axis and a free vortex region outside the forced vortex region.
A centrifugal force is applied to the dust contained in the swirl airflow (air in the
swirl chamber 29). For example, relatively large dust such as fiber dust or hair (such
dust is hereinafter referred to as "dust α") falls in the swirl chamber 29 while being
pressed against the inner peripheral surface of the cylindrical portion 33 (inner wall
surface of the swirl chamber 29) by the centrifugal force. When reaching the height of
the zero-order opening 48, the dust α is separated from the swirl airflow, passes through
the zero-order opening 48, and is fed to the zero-order dust collection chamber 30. The
dust α having entered the zero-order dust collection chamber 30 from the zero-order
opening 48 falls in the zero-order dust collection chamber 30 while moving in the same
direction as the direction of the airflow swirling in the swirl chamber 29 (swirl direction).
Then, the dust α reaches a lowermost portion of the zero-order dust collection chamber
, and is collected.
Dust that has not entered the zero-order dust collection chamber 30 from the zero-
order opening 48 travels downward while swirling in the swirl chamber 29 on the airflow
in the swirl chamber 29. Relatively small dust such as sand dust or fine fiber dust (such
dust is hereinafter referred to as "dust β") passes through the primary opening 38. Then,
the dust β falls into the primary dust collection chamber 31 and is collected.
When the airflow swirling in the swirl chamber 29 reaches the lowermost portion
of the swirl chamber 29, the airflow changes its traveling direction to an upward direction,
and rises along the central axis of the swirl chamber 29. The dust α and the dust β are
removed from the air that forms the rising airflow. The airflow from which the dust α
and the dust β are removed (clean air) passes through the discharge opening 54 and is
discharged to the outside of the swirl chamber 29. The air discharged from the swirl
chamber 29 passes through the inside of the discharge pipe 57 (outlet airflow passage 32),
and reaches the unit outlet 58. Then, the clean air successively passes through the unit
outlet 58 and the connection opening 22, and is fed to the exhaust airflow passage 21.
The electric air blower 10 performs suction, and thus as described above, the dust
α accumulates in the zero-order dust collection chamber 30 and the dust β accumulates in
the primary dust collection chamber 31. The dust α and the dust β can be easily
disposed of by removing the dust collection portion case 26 from the dust collection unit
The dust collection unit 13 (electric vacuum cleaner 1) having the above described
configuration can increase dust separation performance and reduce noise without
increasing the size of the device.
In the dust collection unit 13, the bypass inlet 41 is formed in the inlet pipe 35
(wall that forms the inlet airflow passage 27), and a part of the dust-containing air
flowing in the inside of the inlet pipe 35 (inlet airflow passage 27) is taken from the
bypass inlet 41 into the bypass inlet airflow passage 28.
Thus, a traveling direction of the dust-containing air flowing into the bypass inlet
airflow passage 28 is significantly bent in the inlet pipe 35. Among dust flowing in the
inside of the inlet pipe 35 (inlet airflow passage 27), dust having a large inertia force, that
is, relatively large dust other than fine dust deviates from the airflow flowing into the
bypass inlet airflow passage 28 before reaching the bypass inlet 41. Only fine dust that
has a small inertia force can pass through the bypass inlet 41 and flow into the bypass
inlet airflow passage 28. Dust other than the fine dust passes through the inlet airflow
passage 27, and is taken from the primary inlet 40 into the swirl chamber 29.
The dust collection unit 13 having the above described configuration can prevent
dust from entering the bypass inlet airflow passage 28, and prevent the secondary inlet 42
and the bypass inlet airflow passage 28 from being clogged with dust. There is no need
to provide another separation device for collecting large dust on the upstream side of the
dust collection unit 13. This can reduce the size of the dust collection unit 13, and
reduce the sizes of the vacuum cleaner body 6 and the electric vacuum cleaner 1.
In this embodiment, the case where the bypass inlet 41 is formed in the upper
surface of the inlet pipe 35 (upper wall that forms the inlet airflow passage 27) has been
described. However, a certain advantage can be expected by forming the bypass inlet
41 anywhere in the inlet pipe 35 (for example, the side wall forming the inlet airflow
passage 27).
When the bypass inlet 41 is opened in the upper surface of the inner wall of the
inlet pipe 35, a traveling direction of the dust-containing air flowing into the bypass inlet
airflow passage 28 is significantly bent upward in the inlet pipe 35. The dust must
move upward against the gravity in the inlet pipe 35 in order to pass through the bypass
inlet 41. This can prevent heavy dust from flowing into the bypass inlet airflow passage
28, and further prevent the secondary inlet 42 and the bypass inlet airflow passage 28
from being clogged with dust.
In the dust collection unit 13, the dust-containing air flows from the primary inlet
40 and the secondary inlet 42 into the swirl chamber 29 so as to successively push the
swirl airflow in the swirl chamber 29 from behind. That is, the dust-containing air
newly taken into the swirl chamber 29 flows into the swirl chamber 29 so as to accelerate
the swirl airflow already formed in the swirl chamber 29. Providing the bypass inlet
airflow passage 28 can increase a swirl force in the swirl chamber 29, and significantly
improve a function of separating dust (separation function).
A reduction in the swirl force in the swirl chamber 29 reduces the separation
function. For example, when the dust-containing air is taken only from the primary inlet
into the swirl chamber, a velocity of air flowing from the primary inlet into the swirl
chamber (flow velocity) must be increased to ensure a predetermined swirl force. This
increases the size of the electric air blower, and increases the sizes of the vacuum cleaner
body and the electric vacuum cleaner. Also in such terms, the dust collection unit 13
having the above described configuration can reduce the size of the device.
Providing the bypass inlet airflow passage 28 can reduce the flow velocity of air
required for ensuring the predetermined swirl force as compared to a case without the
bypass inlet airflow passage 28. Thus, providing the bypass inlet airflow passage 28 can
reduce airflow noise, and reduce noise of the device.
In the dust collection unit 13, the bypass inlet airflow passage 28 is formed so that
the dust-containing air moves in the swirl direction in the swirl chamber 29. For
example, the front half of the bypass inlet airflow passage 28 is formed into a C shape
along the swirl direction in the swirl chamber 29 in the upper portion of the swirl
chamber 29. The rear half of the bypass inlet airflow passage 28 is formed along the
outer peripheral surface of the cylindrical portion 33 (outer surface of the side wall that
forms the swirl chamber 29).
This configuration can reduce pressure loss in the bypass inlet airflow passage 28,
and allows a certain amount of air to flow from the bypass inlet airflow passage 28 into
the swirl chamber 29. Since the dust-containing air from the bypass inlet airflow
passage 28 smoothly merges into the swirl chamber 29, the swirl force in the swirl
chamber 29 is unlikely to be reduced.
In the dust collection unit 13, the bypass inlet airflow passage 28 is formed of
parts of the discharge portion case 23, the bypass portion case 24, and the inlet portion
case 25. Thus, the front half of the bypass inlet airflow passage 28 is placed in the
upper portion of the swirl chamber 29 so as to partially cover the swirl chamber 29. The
rear half of the bypass inlet airflow passage 28 is placed around the swirl chamber 29 so
as to cover the upper end of the swirl chamber 29 (portion having the primary inlet 40
and the secondary inlet 42).
In the dust collection unit 13, the airflow from the primary inlet 40 and the airflow
from the secondary inlet 42 merge with each other in the swirl chamber 29, and swirl at
high speed. The flow velocity of air flowing in the bypass inlet airflow passage 28 is
lower than that of air swirling in the swirl chamber 29. Thus, the bypass inlet airflow
passage 28 is placed outside the swirl chamber 29 so as to cover the swirl chamber 29,
and thus airflow noise generated in the swirl chamber 29 can be blocked by the bypass
inlet airflow passage 28 to reduce noise leaking outside.
Similarly, the bypass inlet airflow passage 28 is placed outside the discharge pipe
57 so as to cover a part of the discharge pipe 57. In particular, the rear half of the
bypass inlet airflow passage 28 is placed to surround the discharge portion 51 having the
discharge opening 54. With this configuration, airflow noise generated when the air in
the swirl chamber 29 passes through the discharge opening 54 can be blocked by the
bypass inlet airflow passage 28 to reduce noise leaking outside.
Further, the dust collection unit 13 may have a configuration described below.
For example, a part on one axial end side of a substantially cylindrical side wall
that forms the swirl chamber 29 is opened to form the primary inlet 40. Also, in the
inner wall of the inlet pipe 35, the bypass inlet 41 is formed to open in a direction on one
axial end side of the substantially cylindrical side wall that forms the swirl chamber 29.
In this case, most of the airflow and the dust flowing straight through the inlet airflow
passage 27 into the swirl chamber 29 moves in a direction on the other axial end side of
the substantially cylindrical side wall that forms the swirl chamber 29 (downward in
Figure 12), while the airflow entering the bypass inlet airflow passage 28 from the inlet
airflow passage 27 moves in the direction on the one axial end side of the substantially
cylindrical side wall that forms the swirl chamber 29 (upward in Figure 12). Thus, dust
entering the bypass inlet airflow passage 28 can be further reduced to prevent the
secondary inlet 42 and the bypass inlet airflow passage 28 from being clogged with dust.
Also, for example, an area (opening area) of the bypass inlet 41 is smaller than an
area (opening area) of the primary inlet 40. Reducing the opening area of the bypass
inlet 41 can further reduce dust entering the bypass inlet airflow passage 28. This can
prevent the secondary inlet 42 and the bypass inlet airflow passage 28 from being
clogged with dust.
Also, the area (opening area) of the bypass inlet 41 is smaller than the area
(opening area) of the secondary inlet 42. Dust entering the bypass inlet airflow passage
28 has a size such as to pass through the bypass inlet 41. The opening area of the
secondary inlet 42 being larger than the opening area of the bypass inlet 41 can reliably
prevent the secondary inlet 42 from being clogged with dust.
Also, the area (opening area) of the bypass inlet 41 is smaller than a sectional area
of the bypass inlet airflow passage 28. In particular, the opening area of the bypass inlet
41 is smaller than a sectional area of a narrowest portion (minimum sectional area) of the
bypass inlet airflow passage 28. Dust entering the bypass inlet airflow passage 28 has a
size such as to pass through the bypass inlet 41. The sectional area of the bypass inlet
airflow passage 28 being larger than the opening area of the bypass inlet 41 can reliably
prevent the bypass inlet airflow passage 28 from being clogged with dust.
Also, when a plurality of secondary inlets 42 are formed, secondary inlets placed
on more downstream side have a larger opening area. For example, as in this
embodiment, a case where a second secondary inlet 42, a first secondary inlet 42 placed
on a more upstream side of the second secondary inlet 42, and a third secondary inlet 42
placed on a more downstream side than the second secondary inlet 42 is considered. In
such a case, the first secondary inlet 42 has a smallest opening area. The third
secondary inlet 42 has a largest opening area.
When the plurality of secondary inlets 42 are formed, the dust-containing air
flowing from the secondary inlet 42 on the downstream side into the swirl chamber 29
moves in the bypass inlet airflow passage 28 a longer distance than the dust-containing
air flowing from the secondary inlet 42 on the upstream side into the swirl chamber 29.
Moving the longer distance increases pressure loss. Using this configuration can
equalize pressure loss in each path of the bypass inlet airflow passage 28. That is, an
amount of airflow flowing from each secondary inlet 42 into the swirl chamber 29 can be
equalized. This prevents a swirl airflow in the swirl chamber 29 from being largely
disturbed by the airflow from the secondary inlet 42, and can increase dust separation
performance.
Embodiment 2
Figure 21 is a plan view showing a bypass portion case in a dust collection unit of
an electric vacuum cleaner according to Embodiment 2 of the present invention. Figure
22 is a plan view showing an inlet portion case in the dust collection unit of the electric
vacuum cleaner according to Embodiment 2 of the present invention.
As shown in Figures 21 and 22, in an inlet portion case 25 in this embodiment,
many bypass inlets 59 (micropores) communicating with an internal space of an inlet
pipe 35 (inlet airflow passage 27) is formed in an upper surface of the inlet pipe 35.
With such a configuration, even a small opening area of each bypass inlet 59 can increase
an area of the entire opening (total opening area), and pressure loss near an entry of a
bypass inlet airflow passage 28 can be reduced. That is, such a configuration can
prevent large dust from entering the bypass inlet airflow passage 28 while ensuring a
sufficient flow of air into the bypass inlet airflow passage 28.
A bypass portion case 24 has a first bypass opening 60 in a bottom 49 so as not to
close the bypass inlet 59. The first bypass opening 60 is formed, for example, across a
predetermined range so that all the bypass inlets 59 are placed in the opening when the
bypass portion case 24 is properly mounted to the inlet portion case 25.
Also, the dust collection unit 13 having the above described configuration may
adopt a configuration described below.
For example, each of the micropores (one bypass inlet 59) has an opening area
smaller than an opening area of a secondary inlet 42. Dust entering the bypass inlet
airflow passage 28 has a size such as to pass through the bypass inlet 59. The secondary
inlet 42 having the opening area larger than the opening area of the bypass inlet 59 can
reliably prevent the secondary inlet 42 from being clogged with dust.
Also, for example, each of the micropores (one bypass inlet 59) has an opening
area smaller than a sectional area of the bypass inlet airflow passage 28. In particular,
each of the micropores has an opening area smaller than a minimum sectional area of the
bypass inlet airflow passage 28. Dust entering the bypass inlet airflow passage 28 has a
size such as to pass through the bypass inlet 59. The bypass inlet airflow passage 28
having the sectional area larger than the area of the bypass inlet 59 can reliably prevent
the bypass inlet airflow passage 28 from being clogged with dust.
Other configurations are the same as those disclosed in Embodiment 1.
Embodiment 3
Figure 23 is a plan view showing a dust collection unit of an electric vacuum
cleaner according to Embodiment 3 of the present invention. Figure 24 is a K-K
sectional view of the dust collection unit in Figure 23.
As shown in Figure 24, in an inlet portion case 25 in this embodiment, a rib 61 is
provided on an inlet pipe 35. The rib 61 is provided to protrude from an inner wall
surface of the inlet pipe 35 into an internal space (inside) thereof. The rib 61 is placed
on an immediately upstream side of a bypass inlet 41, and along an upstream edge of the
bypass inlet 41.
In this embodiment, the bypass inlet 41 is provided on an upper wall that forms an
inlet airflow passage 27, and opens in an upper surface of an inner wall of the inlet pipe
. Thus, the rib 61 is placed in the inlet airflow passage 27 so as to protrude downward
from the upper surface of the inner wall of the inlet pipe 35. Also, the rib 61 is placed to
cover (surround) the entire upstream edge of the bypass inlet 41 from the upstream side.
In the dust collection unit 13 having the above described configuration, dust
flowing in the inlet airflow passage 27 must bypass the rib 61 to enter a bypass inlet
airflow passage 28. When the dust bypasses the rib 61, a traveling direction of the dust
is largely bent, and thus large dust deviates from an airflow flowing into the bypass inlet
airflow passage 28 during bypassing. Thus, providing the rib 61 further prevents dust
from entering the bypass inlet airflow passage 28.
Other configurations are the same as the configurations disclosed in Embodiment
1 or 2.
Embodiment 4
Figure 25 is a perspective view showing a dust collection unit of an electric
vacuum cleaner according to Embodiment 4 of the present invention. Figure 26 is a side
view showing the dust collection unit of the electric vacuum cleaner according to
Embodiment 4 of the present invention. Figure 27 is a front view showing the dust
collection unit of the electric vacuum cleaner according to Embodiment 4 of the present
invention. Figure 28 is a plan view showing the dust collection unit of the electric
vacuum cleaner according to Embodiment 4 of the present invention. Figure 29 is an L-
L sectional view of the dust collection unit in Figure 28. Figure 30 is an M-M sectional
view of the dust collection unit in Figure 28. Figure 31 is an N-N sectional view of the
dust collection unit in Figure 29. Figure 32 is a plan view showing a bypass portion
case in the dust collection unit of the electric vacuum cleaner according to Embodiment 4
of the present invention. Figure 33 is a plan view showing an inlet portion case in the
dust collection unit of the electric vacuum cleaner according to Embodiment 4 of the
present invention.
The groove 44 in Embodiments 1 to 3 is formed at the same depth from the
upstream end (other end) to the downstream end (one end). That is, the bottom surface
of the groove 44 (rear half of the bypass inlet airflow passage 28) is formed to be flat.
In this embodiment, a bypass airflow passage forming portion 62 is provided on a
cylindrical portion 33 so as to surround the cylindrical portion 33, and three grooves 63
are formed in the bypass airflow passage forming portion 62. The groove 63 has the
same configuration as the groove 44 except for the bottom surface.
Dust-containing air in the front half of the bypass inlet airflow passage 28 passes
through the second bypass opening 53 and moves downward. Thus, if the bottom
surface is formed to be flat as in the groove 44, dust is prone to accumulate on the other
end side (the side opposite from the side with a secondary inlet 42). In the groove 63,
the bottom surface on the other end side, that is, the bottom surface located below the
second bypass opening 53 is obliquely formed so as to be lowered toward one end side
(downstream side). Thus, dust having entered the groove 63 from the second bypass
opening 53 successively moves to the one end side, and flows from the secondary inlet 42
into a swirl chamber 29. Adopting this configuration can reliably prevent the groove 63
(rear half of the bypass inlet airflow passage 28) from being clogged with dust.
Also, the inlet pipe 35 in Embodiments 1 to 3 is formed of the straight member.
On the other hand, an inlet pipe 64 in this embodiment is partially formed into an arcuate
shape along an outer peripheral surface of a cylindrical portion 33 (outer surface of a side
wall that forms a swirl chamber 29) outside the cylindrical portion 33. An opening in
the other end of the inlet pipe 64 is a primary inlet 40.
The bypass inlet 65 is formed in an upper surface of the curved portion of the inlet
pipe 64. That is, the bypass inlet 65 opens in an upper surface of an inner wall of the
curved portion of the inlet pipe 64. Also, the bypass inlet 65 is placed closer to an inner
side wall (in this embodiment, a part of the cylindrical portion 33 also serves as the inner
side wall) between curved side walls that form the curved portion of the inlet pipe 64. A
predetermined distance is ensured between the bypass inlet 65 and a curved outer side
wall.
A centrifugal force is applied to dust passing through the inlet pipe 64 when the
dust passes through the curved portion. Thus, the dust passes near the outer side wall in
the curved portion of the inlet pipe 64. Forming the bypass inlet 65 closer to the inner
side wall can prevent dust (particularly, dust having a large inertia force) from flowing
into the bypass inlet airflow passage 28, and further prevent the secondary inlet 42 and
the bypass inlet airflow passage 28 from being clogged with dust.
In the bypass portion case 24, parts of the bottom 66 and the side wall portion 67
are formed to protrude outward in accordance with the configuration of the inlet pipe 64.
Also, a first bypass opening 68 is formed immediately above the bypass inlet 65.
Other configurations are the same as the configurations disclosed in any of
Embodiments 1 to 3.
In Embodiments 1 to 4 above, the electric vacuum cleaner 1 of the canister type
has been described, but the present invention may be applied to an electric vacuum
cleaner of a different type.
Industrial Applicability
The present invention may be applied to a cyclone separation device, and an
electric vacuum cleaner.
Reference Signs List
1 electric vacuum cleaner
2 suction opening body
3 suction pipe
4 connection pipe
suction hose
6 vacuum cleaner body
7 handle
8 operation switch
9 hose connection opening
electric air blower
11 power cord
12 housing unit
13 dust collection unit
14, 15 housing body
15a housing portion
16 intake airflow passage forming portion
17 exhaust airflow passage forming portion
18 wheel
19 intake airflow passage
, 22 connection opening
21 exhaust airflow passage
23 discharge portion case
24 bypass portion case
inlet portion case
26 dust collection portion case
27 inlet airflow passage
28 bypass inlet airflow passage
29 swirl chamber
zero-order dust collection chamber
31 primary dust collection chamber
32 outlet airflow passage
33 cylindrical portion
34 conical portion
, 64 inlet pipe
36, 62 bypass airflow passage forming portion
37 connection portion
38 primary opening
39 unit inlet
40 primary inlet
41, 59, 65 bypass inlet
42 secondary inlet
43 rising portion
44, 63 groove
45 bottom
46 outer wall portion
47 partition portion
48 zero-order opening
49, 66 bottom
50, 67 side wall portion
51, 56 discharge portion
52, 60, 68 first bypass opening
53 second bypass opening
54 discharge opening
55 lid
57 discharge pipe
58 unit outlet
61 rib
The term 'comprising' as used in this specification and claims means 'consisting
at least in part of'. When interpreting statements in this specification and claims which
include 'comprising'; other features besides the features prefaced by this term in each
statement can also be present. Related terms such as 'comprise' and 'comprised' are to
be interpreted in a similar manner.
Claims (15)
- [Claim 1] A cyclone separation device comprising: a swirl chamber that swirls, along a side wall thereof, dust-containing air entered from a primary inlet and a secondary inlet of the swirl chamber, and separates dust from the dust-containing air; a dust collection chamber that collects the dust separated by the swirl chamber; a discharge pipe having a discharge opening for discharging air in the swirl chamber; an inlet pipe that allows the dust-containing air to flow from the primary inlet into the swirl chamber; a bypass inlet that opens in an inner wall of the inlet pipe; and a bypass inlet airflow passage that allows the dust-containing air to enter thereinto from the bypass inlet and to flow from the secondary inlet into the swirl chamber.
- [Claim 2] The cyclone separation device according to claim 1, wherein the bypass inlet opens in an upper surface of an inner wall of the inlet pipe.
- [Claim 3] The cyclone separation device according to claim 1, comprising a substantially cylindrical side wall that forms the swirl chamber, a part of the side wall on one axial end side being opened to form the primary inlet, wherein the bypass inlet opens in an axial direction of the side wall.
- [Claim 4] The cyclone separation device according to any one of claims 1 to 3, wherein the bypass inlet has an opening area smaller than an opening area of the primary inlet.
- [Claim 5] The cyclone separation device according to any one of claims 1 to 4, wherein the bypass inlet has an opening area smaller than an opening area of the secondary inlet.
- [Claim 6] The cyclone separation device according to any one of claims 1 to 5, wherein the bypass inlet has an opening area smaller than a minimum sectional area of the bypass inlet airflow passage.
- [Claim 7] The cyclone separation device according to any one of claims 1 to 6, wherein the bypass inlet includes a plurality of micropores formed in the inlet pipe.
- [Claim 8] The cyclone separation device according to claim 7, wherein each of the micropores has an opening area smaller than an opening area of the secondary inlet.
- [Claim 9] The cyclone separation device according to claim 7, wherein each of the micropores has an opening area smaller than a minimum sectional area of the bypass inlet airflow passage.
- [Claim 10] The cyclone separation device according to any one of claims 1 to 9, comprising a rib that is provided on the inlet pipe, protrudes inward from an inner wall surface of the inlet pipe, and is placed along an upstream edge of the bypass inlet.
- [Claim 11] The cyclone separation device according to any one of claims 1 to 10, wherein the bypass inlet airflow passage is formed so that dust-containing air moves in a direction of air swirling in the swirl chamber.
- [Claim 12] The cyclone separation device according to any one of claims 1 to 11, wherein a bypass opening through which dust-containing air passes when moving downward is formed in the bypass inlet airflow passage, and the bypass inlet airflow passage is formed so that a bottom surface located below the bypass opening is obliquely formed so as to be lowered toward a downstream side.
- [Claim 13] The cyclone separation device according to any one of claims 1 to 12, wherein a part of the inlet pipe is formed into an arcuate shape along a side wall of the swirl chamber, and the bypass inlet opens in an upper surface of an inner wall of the part of the inlet pipe, and is placed closer to an inner side wall between curved side walls that form the part.
- [Claim 14] The cyclone separation device according to any one of claims 1 to 13, wherein the secondary inlet includes a first secondary inlet, and a second secondary inlet placed on a more downstream side than the first secondary inlet, and the second secondary inlet has an opening area larger than an opening area of the first secondary inlet.
- [Claim 15] The cyclone separation device according to any one of claims 1 to 14, wherein the bypass inlet airflow passage is provided outside the swirl chamber so that at least a part thereof covers a part of the swirl chamber.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012043579A JP5077494B1 (en) | 2012-02-29 | 2012-02-29 | Cyclone separation device and vacuum cleaner |
JP2012-043579 | 2012-02-29 | ||
PCT/JP2012/066982 WO2013128664A1 (en) | 2012-02-29 | 2012-07-03 | Cyclone separation device and electric vacuum cleaner |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ628693A NZ628693A (en) | 2015-08-28 |
NZ628693B2 true NZ628693B2 (en) | 2015-12-01 |
Family
ID=
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