JP5416794B2 - Electric vacuum cleaner - Google Patents

Description

  The present invention relates to a vacuum cleaner capable of separating air containing sucked dust into an air flow containing dust at a high concentration and an air flow containing no dust.

  The vacuum cleaner collects air containing dust sucked from a hose through a dust collecting unit, and exhausts the air from which dust is removed to the outside. For this reason, there is a problem that the dust collecting part is clogged with dust, and the suction force for sucking air from the hose cannot be kept high.

  Therefore, the cyclone method is used to separate the air flow containing dust at a high concentration and the air flow not containing dust using the principle of centrifugal separation, and to secure a flow path of the air flow not containing dust. Thus, it has been proposed to maintain the suction force at a high level (see Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 51-43271 (FIG. 3) JP 2006-296812 A (FIG. 4)

  However, in order to maintain the suction force at a high level, it is necessary not only to ensure a flow of air that does not contain dust, but also to ensure the flow rate as much as possible. However, when the flow rate is increased, it is considered that dust is likely to be mixed into the air flow not including dust. Therefore, increasing the flow rate of the air flow that does not include dust does not increase the amount of dust mixed in the air flow that does not include dust. It was thought that it was necessary to further increase the separation ability to separate into a stream.

  Then, this invention makes it a subject to provide the vacuum cleaner which can improve the isolation | separation capability which isolate | separates into the flow of the air which contained dust in high concentration, and the flow of the air which does not contain dust.

  The present invention provides an outer cylinder in which dust-containing air swirls on the inner peripheral side, an inner cylinder accommodated in the outer cylinder and swirled on the outer peripheral side, and provided between the outer cylinder and the inner cylinder. And a spiral rectifying plate for guiding the air in the axial direction of the inner cylinder, and a gap is provided between the rectifying plate and the outer cylinder.

  According to the present invention, since the air containing dust turns in the annular space between the outer cylinder and the inner cylinder, centrifugal force can be applied to the air containing dust. Since dust has a specific gravity greater than that of air and a centrifugal force greater than that of air acts, dust gathers in the vicinity of the outer cylinder while turning, and an air flow containing dust in a high concentration is formed in the vicinity of the outer cylinder. On the other hand, in the vicinity of the inner cylinder, dust moves to the outer cylinder side while turning, so that an air flow not containing dust turns around the inner cylinder.

  In the present invention, the spiral rectifying plate that guides air in the axial direction of the inner cylinder can guide and move the air in the axial direction of the inner cylinder while turning the air and applying centrifugal force. . However, since the rectifying plate has a gap between the outer cylinder and the outer cylinder, the flow of air without dust is more in the axial direction of the inner cylinder than the flow of air containing dust at a high concentration. It can be moved greatly and the resolution can be enhanced.

  As described above, according to the present invention, it is possible to provide an electric vacuum cleaner capable of enhancing the separation ability to separate the air flow containing dust at a high concentration into the air flow not containing dust.

(A) is a perspective view of the vacuum cleaner which concerns on embodiment of this invention, (b) is a perspective view which shows the state which opened the main body cover of this vacuum cleaner. It is a schematic diagram which shows the flow (solid line arrow) and the flow of dust (broken line arrow) in a vacuum cleaner. It is a perspective view of a dust case. It is a perspective view of a dust case in the state where a filter (cover of a dust case) was opened. It is arrow sectional drawing of the AA direction of FIG. It is arrow sectional drawing of the BB direction of FIG. It is a disassembled perspective view of a spiral part. It is a perspective view (the 1) of a spiral part. It is a perspective view (the 2) of a spiral part.

  Fig.1 (a) shows the perspective view of the vacuum cleaner 1 which concerns on embodiment of this invention, FIG.1 (b) shows the perspective view of the vacuum cleaner 1 of the state which opened the main body cover 9. As shown in FIG. As shown in FIGS. 1A and 1B, the vacuum cleaner 1 includes a main body case 2 and a dust case 8 built in the main body case 2, and further, a rear portion of the main body case 2. A pair of rear wheels 3, a hose connection 4 for connecting a hose 10 to the tip, a handle 5b and a handle 5a on the tip and the top, a cord take-up button 6 on the top, and both sides And a main body exhaust port 7 and a cord plug 11 for supplying power and the like on the rear surface. The main body exhaust port 7 is constituted by a plurality of through holes provided in the main body case 2.

And as shown in FIG.1 (b), if the main body cover 9 of the vacuum cleaner 1 is opened, the dust case 8 can be exposed. The user can remove the dust case 8 from the main body case 2 by pulling up the dust case handle 24. Dust is collected in the dust case 8 and can be taken out from the vacuum cleaner 1 without being scattered. Then, the dust case 8 from which the dust has been removed is mounted again in the main body case 2.

  FIG. 2 shows the air flow (solid arrow) and the dust flow (dashed arrow) in the vacuum cleaner 1. In the vacuum cleaner 1, a dust case 8 is disposed behind the hose connection portion 4. The dust case 8 is provided adjacent to the inflow portion 12, the first dust collection chamber 15 partitioned by the inner cylinder 14 and the outer cylinder 13, and the first dust collection chamber 15 across the outer cylinder 13. And a second dust collection chamber 16.

A filter 17 is disposed behind the dust case 8. The filter 17 also serves as a lid for the dust case 8 so that the dust does not scatter from the dust case 8 when the dust case 8 is taken out. ing. The filter 18 is provided behind the filter 17 and serves to prevent the dust from entering the electric blower 23 even if it spills from the dust case 8.

  The electric blower 23 is provided behind the filter 18. The electric blower 23 blows air from the front and exhausts from the top to generate an air flow (solid arrow) and a dust flow (broken arrow).

  The filter 19 is provided above the electric blower 23. The filter 20 is provided behind the filter 19 so as to face the main body exhaust port 7 on the rear surface of the main body case 2. The filter 21 is provided on both sides of the filter 19 so as to face the main body exhaust ports 7 on both side surfaces of the main body case 2. The filter 22 is provided in front of the filter 21 so as to face the main body exhaust ports 7 on both side surfaces of the main body case 2.

Next, the flow path of the air flow (solid arrow) and the dust flow (broken arrow) in the vacuum cleaner 1 will be described.

  First, the air flow (solid line arrow) and the dust flow (broken line arrow) flow through the hose 10 (see FIG. 1 (a)) and flow from the hose connection portion 4 as they are. 12 flows in. Note that the air flow (solid arrow) and the dust flow (broken arrow) do not actually exist separately, but are air flows containing dust.

  The air flow (solid line arrow) and the dust flow (broken line arrow) flow into the first dust collecting chamber 15 between the inner cylinder 14 and the outer cylinder 13 and swirl. By this turning, centrifugal force can be applied to air containing dust. Since dust has a specific gravity greater than that of air and a centrifugal force greater than that of air acts, the dust gathers in the vicinity of the outer cylinder 13 while turning, and an air flow containing dust at a high concentration is formed in the vicinity of the outer cylinder 13. The On the other hand, in the vicinity of the inner cylinder 14, dust moves to the outer cylinder 13 side while turning, so that an air flow that does not contain the turning dust is formed around the inner cylinder 14.

Then, the flow of air containing dust at a high concentration keeps swirling in the first dust collecting chamber 15, so that the dust flow (broken arrows) also keeps swirling in the first dust collecting chamber 15. Substantially, dust can be trapped in the first dust collecting chamber 15.

  A part of the air flow containing dust in a high concentration flows into the second dust collecting chamber 16 as shown by the air flow (solid arrow) and the dust flow (broken arrow). Since the dust flowing into the second dust collecting chamber 16 cannot pass through the filter 17, the dust flow (broken arrow) stops at the second dust collecting chamber 16, and the dust is trapped in the second dust collecting chamber 16. The air flow (solid arrow) flowing into the second dust collection chamber 16 passes through the filter 17.

  The air flow that does not contain the dust swirling around the inner cylinder 14 passes through the filter 17 as a flow of two paths. One path is a path that passes through the filter 17 beyond the outer cylinder 13. Since the position in the direction of the central axis of the outer cylinder 13 is different from the position of the path in which the air flow containing dust in a high concentration swirls, the paths do not collide with each other. The other path passes through the exhaust hole 32 provided in the side wall of the inner cylinder 14, flows inside the inner cylinder 14 to the end of the inner cylinder 14, and dives the outer cylinder 13 from the end of the inner cylinder 14. This is a path that passes through the filter 17.

  The air flow (solid arrow) that has passed three paths before passing through the filter 17 becomes one path after passing through the filter 17, and passes through the filter 18, the electric blower 23, and the filter 19 in order. The air flow (solid arrow) is divided into five paths after passing through the filter 19 to cool the substrate, the power cord, and the like. Further, by performing distributed exhaust in this manner, the momentum of exhaust can be reduced, and discomfort caused by blowing off dust or hitting the human body can be reduced. The air flow (solid arrow) flowing through the first path flows along the back surface of the electric blower 23, passes through the filter 20, and is exhausted from the main body exhaust port 7 provided on the rear surface of the main body case 2. . The flow of air flowing through the remaining four paths (solid arrows) flows along the side surface of the electric blower 23, passes through the main body exhaust port 7 (filter 21, filter 22) provided on the side surface of the main body case 2, It is exhausted outside the body.

  FIG. 3 shows a perspective view of the dust case 8. An inflow portion 12 is provided on the front surface of the dust case 8, and a filter 17 is provided on the back surface. A dust case handle 24 and a waste disposal button 25 are provided on the upper surface of the dust case 8. The user can hold the dust case handle 24 and hold the dust case 8, and press the garbage disposal button 25 with the one hand held by the user. By pressing the waste disposal button 25, the filter 17 that is the lid of the dust case 8 can be opened as shown in FIG.

  As shown in FIG. 4, the inside of the outer cylinder 13 is a first dust collection chamber 15. A rectifying plate 29 is provided in the first dust collecting chamber 15. A first exhaust port 27 is provided in the upper portion of the outer cylinder 13 on the filter 17 side. A second exhaust port 28 is provided at the lower portion of the outer cylinder 13 on the filter 17 side. A second dust collection chamber 16 is provided adjacent to the first dust collection chamber 15 (outer cylinder 13). The first dust collection chamber 15 and the second dust collection chamber 16 communicate with each other through an introduction port 26 provided in the upper part of the outer cylinder 13.

  FIG. 5 shows a cross-sectional view in the direction of arrows AA in FIG. 3, and FIG. 6 shows a cross-sectional view in the direction of arrows BB in FIG.

  As shown in FIG. 5, the central axis of the inner cylinder 14 and the central axis of the outer cylinder 13 coincide with each other. As shown in FIGS. 5 and 6, the straight line that is the normal line of the opening surface of the inflow portion 12 and passes through the center of the opening surface does not intersect the central axis and the inner cylinder 14, and the outer cylinder 13 has Intersect. And the inner peripheral surface of the outer cylinder 13 is arrange | positioned in the center front of the inflow part 12. FIG. As a result, when air containing dust flows in from the inflow portion 12, the inside of the first dust collection chamber 15, which is a space between the outer side (outer peripheral side) of the inner cylinder 14 and the inner side (inner peripheral side) of the outer cylinder 13. Turn.

The first exhaust port 27 is provided in the upper part of the outer cylinder 13 located in the center front of the inflow part 12, and the inflow part 12 and the first exhaust port 27 are in the direction of the central axis of the inner cylinder 14. The positions are shifted from each other. The first exhaust port 27 is provided on the outer cylinder 13 that is shifted in the direction of the central axis of the inner cylinder 14 from the inflow portion 12 toward the introduction port 26 (upward). The air containing dust flowing in from the inflow portion 12 is not easily exhausted directly from the first exhaust port 27. When exhausted from the first exhaust port 27, the air is swung around the outer periphery of the inner cylinder 14 to remove dust. It is exhausted after moving upward (guided). Accordingly, air that does not contain dust is exhausted from the first exhaust port 27 to the filter 17.

Further, the introduction port 26 is provided immediately above the inflow portion 12, and the inflow portion 12 and the introduction port 26 are arranged so as to be shifted from each other in the direction of the central axis of the inner cylinder 14. For this reason, the air containing the dust flowing in from the inflow portion 12 is difficult to be directly introduced into the second dust collecting chamber 16 from the introduction port 26, and when introduced into the second dust collecting chamber 16, the inner cylinder 14 is used. The air flow containing dust at a high concentration is formed by turning around the outer peripheral side of the gas, and the air flow containing dust at a high concentration is introduced into the second dust collecting chamber 16 from the introduction port 26.

As illustrated in FIG. 5, the rectifying plate 29 includes a first rectifying plate 29 a that is disposed in the lower stage and a second rectifying plate 29 b that is disposed in the upper stage and is double. As shown in FIGS. 5 and 6, the rectifying plate 29 is provided between the outer cylinder 13 and the inner cylinder 14 and has a spiral shape, so that the inner cylinder 14 remains swirled with the air flowing in from the inflow portion 12. It can be guided and moved upward in the axial direction.

The first rectifying plate 29a is arranged in an angle range of about one turn at an angle around the axis of the inner cylinder 14, and the second rectifying plate 29b is also in an angle range of about one turn at an angle around the axis of the inner cylinder 14. Therefore, the rectifying plate 29 is arranged so as to overlap with itself by projection in the axial direction beyond the angle range of one round in the angle around the axis of the inner cylinder 14. The second rectifying plate 29b is arranged to overlap the first rectifying plate 29a by axial projection. Thus, by making the current plate 29 into a double spiral shape, the number of swirling of the dust flow can be increased and the swirling speed can be increased, so that the dust can be efficiently separated by the centrifugal separation effect. it can. Further, since the swirl speed is increased, the transfer speed of dust to the second dust collection chamber 16 is also increased, so that the dust can be collected with higher compression in the second dust collection chamber 16, and the second dust collection chamber can be collected. The amount of dust collection at 16 can be increased. In addition, the number of waste disposal can be reduced.

A gap is provided between the rectifying plate 29, particularly the second rectifying plate 29 b, with the outer cylinder 13. Since the rectifying plate 29 (second rectifying plate 29 b) is provided in the vicinity of the inner cylinder 14, the air gap that does not contain dust that swirls in the vicinity of the inner cylinder 14 is provided in the gap. It can be guided and moved in the axial direction of the inner cylinder 14 more than the flow of air containing a high concentration of dust swirling in the vicinity, and the separation performance can be enhanced.

  As shown in FIG. 6, the rectifying plate 29, in particular, the second rectifying plate 29 b is directed outward in the radial direction, and the closer to the outer cylinder 13 from the inner cylinder 14, the closer to the second inner cylinder 14 b from the first inner cylinder 14 a. Inclined to be higher in the direction. As described above, the flow straightening plate 29, in particular, the second flow straightening plate 29b is formed into a slope shape, thereby facilitating the swirling up of the air flow that does not contain dust swirling in the vicinity of the second flow straightening plate 29b. Therefore, a large flow rate can be secured.

  As shown in FIG. 6, a ceiling surface 33 that closes the upper end surface of the outer cylinder 13 is provided on the inlet 26 side of the outer cylinder 13.

  The inner cylinder 14 includes a first inner cylinder 14a having a constant diameter in the central axis direction, and a second inner cylinder 14b having a smaller diameter as it approaches the ceiling surface 33 in the central axis direction. The end surface of the inner cylinder 14 on the ceiling surface 33 side (the upper surface of the second inner cylinder 14b) is inclined with respect to the ceiling surface 33, and the second inner cylinder 14b has a substantially conical shape. When the end surface of the inner cylinder 14 on the ceiling surface 33 side (the upper surface of the second inner cylinder 14 b) is a flat plate and is close to the ceiling surface 33, large dust turns around the inner cylinder 14. In addition, clogging of dust that is caught in the gap between the end surfaces of the inner cylinder 14 facing the ceiling surface 33 was considered. By making the 2nd inner cylinder 14b into a substantially cone shape, the space | interval of the clearance gap between the end surfaces of the inner cylinder 14 which opposes the ceiling surface 33 can be expanded substantially, and the stay and clogging by the catch of dust can be eliminated.

  Further, the rectifying plate 29 is disposed in a range from the end (lower end) of the inflow portion 12 on the side opposite to the introduction port 26 to the center of the introduction port 26 in the central axis direction of the inner cylinder 14. The first rectifying plate 29 a is arranged in a range from the end (lower end) where the inflow portion 12 exists to the end (upper end) in the central axis direction of the inner cylinder 14. The first rectifying plate 29a moves the air containing the dust flowing in from the inflow portion 12 upward, and when the air containing the dust makes one revolution, the air containing the dust flows above the inflow portion 12. Since the collision with the air containing dust immediately after flowing into the inflow portion 12 can be avoided, it is possible to suppress a decrease in pressure loss. And the flow of the air which contains the dust produced by turning in high concentration can be easily guided to the inlet 26.

The second rectifying plate 29 b is arranged in a range extending from the end (upper end) of the inflow portion 12 on the introduction port 26 side to the center of the introduction port 26 in the central axis direction of the inner cylinder 14. Further, the second rectifying plate 29b is not only separated from the outer cylinder 13, but also at an angle around the central axis of the inner cylinder 14 and at an angle in the direction of the inflow portion 12 and the introduction port 26, the second rectifying plate 29b. The inner cylinder 14 has the smallest radial width and is farthest from the outer cylinder 13. The radial direction of the inner cylinder 14 of the second rectifying plate 29b is 180 degrees clockwise and counterclockwise from the angle in the direction of the inflow portion 12 and the inlet 26 at an angle around the central axis of the inner cylinder 14. Is the largest and is closest to the outer cylinder 13. The angle of the inner cylinder 14 of the second rectifying plate 29b increases as the angle increases by 180 degrees clockwise and counterclockwise from the angle in the direction of the inflow portion 12 and the inlet 26 at an angle around the central axis of the inner cylinder 14. The radial width increases, and the second rectifying plate 29 b approaches the outer cylinder 13.

Thereby, although dust turns on the 1st current plate 29a and moves upwards, it does not move on the 2nd current plate 29b. Air that does not contain dust moves mainly on the second rectifying plate 29b, and dust can be reliably separated.

  The end of the first exhaust port 27 on the inflow portion 12 side is disposed above the nearest spiral second rectifying plate 29b and along the spiral second rectifying plate 29b. Moreover, it arrange | positions in the direction away from the inflow part 12 in the central-axis direction of the inner cylinder 14 from the edge of the inflow part 12 side of the inlet 26 and the nearest 2nd rectifying plate 29b. For this reason, even if dust is introduced into the introduction port 26, it is prevented from progressing by the spiral second rectifying plate 29 b and is not discharged from the first exhaust port 27. Can exhaust air without dust.

A plurality of exhaust holes 32 are provided in the side wall surface exposed to the first dust collection chamber 15 of the first inner cylinder 14a so as to communicate the outside and the inside of the first inner cylinder 14a. The exhaust hole 32 is provided in the side wall of the inner cylinder 14 sandwiched between the rectifying plate 29, specifically, the first rectifying plate 29 a and the second rectifying plate 29 b in the central axis direction of the inner cylinder 14. The air that does not contain dust swirling around the outer periphery of the inner cylinder 14 enters the inner side from the outer side of the inner cylinder 14 via the exhaust hole 32, and descends in a direction away from the ceiling surface 33 in the central axis direction. The air is exhausted to the filter 17 via 28.

  In addition, as shown in FIG. 6, the 1st baffle plate 29a and the 1st inner cylinder 14a are integrally molded and joined, and the 1st spiral part 31a is comprised. The 2nd baffle plate 29b and the 2nd inner cylinder 14b are integrally molded, and are joined, and comprise the 2nd spiral part 31b. The first spiral portion 31a and the second spiral portion 31b are connected to form the spiral portion 31, but the spiral portion 31 can be disassembled into a first spiral portion 31a and a second spiral portion 31b. It has a piece structure.

  FIG. 7 shows an exploded perspective view of the spiral portion 31 (see FIG. 6). A pair of fixing claws 34a and 34b are provided at the bottom of the second spiral portion 31b (second inner cylinder 14b). A pair of fixing claw holes 35a and 35b with which a pair of fixing claw 34a and 34b are engaged are provided in the upper portion of the first spiral portion 31a (first inner cylinder 14a). The fixing claw 34b is formed to be larger than the fixing claw 34a. Similarly, the fixing claw hole 35b is formed to be larger than the fixing claw hole 35a. The claw 34a can be fitted only in the fixing claw hole 35a, and the fixing claw 34b is in a one-to-one correspondence so that it can be fitted only in the fixing claw hole 35b. Thereby, the positional relationship between the first spiral portion 31a (first rectifying plate 29a) and the second spiral portion 31b (second rectifying plate 29b) can be always constant, and errors can be eliminated even in the assembly process. Moreover, the spiral part 31 can be easily cleaned by making the first spiral part 31a and the second spiral part 31b disassembleable. By disassembling the two-piece structure, it is not necessary to use a mold having a complicated shape when forming the first spiral portion 31a and the second spiral portion 31b.

  The packing 36 has a shape in which two upper and lower rings are combined. The upper ring seals between the first spiral portion 31 a and the bottom member 37. The spiral portion 31 is detachable from the dust case 8 (see FIG. 5), but the lower ring seals between the spiral portion 31 and the other part of the dust case 8. The first spiral portion 31a and the bottom member 37 are fixed to each other by screws 38 with the packing 36 interposed therebetween. Further, the bottom member 37 is provided with a removal button 39 for removing the spiral portion 31 from the dust case 8. The removal button 39 is supported in a state of being biased by the spring 40, and retracts when the user presses the removal button 39, and comes out to a predetermined position when the user releases the hand.

  FIGS. 8 and 9 show perspective views of the spiral portion 31, and FIG. 8 and FIG. The spiral portion 31 is detachable from the dust case 8 (see FIG. 5). By removing the spiral portion 31 from the dust case 8, the dust case 8 including the spiral portion 31 can be easily cleaned.

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner 2 Main body case 3 Rear wheel 4 Hose connection part 5a, 5b Handle 6 Cord winding button 7 Main body exhaust port 8 Dust case 9 Main body cover 10 Hose 11 Cord plug 12 Inflow part 13 Outer cylinder 14 Inner cylinder 14a 1st Inner cylinder 14b Second inner cylinder 15 First dust collection chamber 16 Second dust collection chamber 17, 18, 19, 20, 21, 22 Filter 23 Electric blower 24 Dust case handle 25 Dust disposal button 26 Inlet 27 First exhaust 28 2nd exhaust port 29 Current plate 29a 1st current plate 29b 2nd current plate 31 Spiral part 31a 1st spiral part 31b 2nd spiral part 32 Exhaust hole 33 Ceiling surface 34a, 34b Fixing claw 35a, 35b Fixing claw hole 36 Packing

Claims (7)

In a vacuum cleaner in which dust-containing air is sucked, and the air is swirled in a dust case to trap dust and exhaust through a filter,
The dust case is
An outer cylinder into which the dust-containing air flows and the air swirls on the inner periphery side;
An inner cylinder accommodated in the outer cylinder and in which the air swivels on the outer periphery side;
A rectifying plate provided in a spiral shape in the axial direction of the inner cylinder, with a gap between the inner cylinder and the outer cylinder, in the vicinity of the inner cylinder and around the axis of the inner cylinder;
A dust collection chamber,
Dust gathers in the vicinity of the outer cylinder because the air becomes a swirling flow between the outer cylinder and the inner cylinder,
Introducing air in the gap between the current plate and the outer cylinder into the dust collection chamber;
An electric vacuum cleaner characterized in that air in the vicinity of the inner cylinder is guided in the axial direction of the inner cylinder by the current plate and flows into the filter . The inner cylinder is composed of a first inner cylinder having a constant diameter in the central axis direction and a substantially conical second inner cylinder having a smaller diameter in the central axis direction.
The rectifying plate is provided on the first inner cylinder and the second inner cylinder, and the radial width is increased or decreased so that a gap between the outer cylinder in the circumferential direction is changed. And a second rectifying plate that
The vacuum cleaner according to claim 1, wherein the air flows in the order of the first rectifying plate and the second rectifying plate .   The first inner cylinder and the first rectifying plate are integrally joined to form a first spiral portion,
  The second inner cylinder and the second rectifying plate are integrally joined to form a second spiral portion,
  The electric vacuum cleaner according to claim 2, wherein the first spiral portion and the second spiral portion are separable.   The one rotation of the spiral shape of the baffle plate in the axial direction of the inner cylinder is disposed in a range from end to end of the inflow portion of the dust-containing air. Electric vacuum cleaner.   A plurality of exhaust holes are provided in a side wall surface sandwiched between the first rectifying plate and the second rectifying plate of the first inner cylinder in the central axis direction of the inner cylinder,
  The vacuum cleaner according to claim 2, wherein the air swirling around the outer periphery of the inner cylinder is exhausted.   An electric blower that forms a unidirectional air flow;
  A filter provided on the intake side of the electric blower;
  The inner cylinder provided above the air flow of the filter and provided with a spiral rectifying plate in the axial direction, the outer cylinder accommodating the inner cylinder, and the inner cylinder and the outer cylinder partitioned off. A first dust collection chamber, and a dust case having a second dust collection chamber provided with an outer cylinder between the first dust collection chamber and detachably mounted;
  The air containing dust flowing into the dust case becomes a swirling flow in the first dust collecting chamber, and the first air flow containing a large amount of dust on the inner surface of the outer cylinder, and the outer peripheral surface of the inner cylinder Separated into a second air stream of
  The second air is moved in the axial direction of the inner cylinder by the spiral rectifying plate and passes through the filter,
  The vacuum cleaner according to claim 1, wherein the first air flows into the second dust collecting chamber, dust is trapped, and passes through the filter.   The cylinder of the dust case is provided with a plurality of exhaust holes on the cylindrical side wall surface sandwiched between the spiral rectifying plates in the central axis direction of the inner cylinder,
  The vacuum cleaner according to claim 6, wherein a part of the second air is exhausted and passes through the filter.

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