KR20020095437A - Dust-collecting device - Google Patents

Abstract

In the dust collector according to the present invention, the dust inlet 3 is opened and installed in the bottom wall 13 of the housing 11, and a rotary brush accommodating chamber 39 and a dust collecting chamber 36 are provided in the housing 11 together. The rotary brush accommodating chamber 39 is connected to the dust collecting chamber 36 through the airflow passage 34. In the rotary brush accommodating chamber 39, a rotary brush 2 which is rotationally driven by the motor 32 is disposed, and an outer circumferential end of the rotary brush 2 faces the dust suction port 3 of the rotary brush 2. By rotating, the dust on the bottom surface 5 can be swept up and collected in the dust collecting chamber 36 through the airflow passage 34. The housing 11 is provided with a brush cover wall 83 facing the rotary brush accommodation chamber 39 and covering the top of the rotary brush 2, and between the rotary brush accommodation chamber 39 and the dust collection chamber 36. The airflow guide wall 81 which rises and rises from the bottom wall 13 of the housing 11 is provided, and the dust collecting wall 70 protrudes in the upper end part 81a toward the inside of the dust collecting chamber 36.

Description

Dust Collector {DUST-COLLECTING DEVICE}

The present invention relates to a dust collecting device having a rotating brush.

As a dust collector of this kind, the applicant is applying for a dust collector 10 to the Japanese Patent Office as shown in FIG. The dust collector 10 includes a housing 12, a rotary brush 2 disposed in the housing 12, and a dust collecting chamber 36 formed inside the housing 12. A motor 32 for rotating the rotary brush 2 and a secondary battery 33 for supplying electric power to the motor 32 are incorporated. The dust inlet 3 is opened at the bottom wall 14 of the housing 12, and a rotary brush accommodating chamber 39 having the dust inlet 3 as an opening is formed in the housing 12. The dust collecting member 31 protrudes toward the bottom at the opening edge of the dust suction port 3 located behind 2). At four corners of the bottom wall 14 of the housing 12, a traveling roller 41 is disposed to facilitate the movement of the dust collector 10.

The rotary brush 2 has a rotary shaft 22 and a brush portion 21 formed on the outer circumferential surface of the rotary shaft 22, and the rotary shaft 22 is connected to the motor 32 by using a belt (not shown). The outer peripheral end of the brush portion 21 of the rotary brush 2 slightly protrudes from the dust suction port 3. The housing 12 is provided with a brush cover wall 93 facing the rotary brush housing chamber 39, and the brush cover wall 93 covers the upper portion of the rotary brush 2. In the dust collector 10, the rotary brush 2 is driven to rotate so that the dust on the bottom surface 5 is swept up, and passes through the airflow passage 34 from the dust suction port 3 to the dust chamber 36. Accumulate.

However, in the dust collecting device 10, as shown by arrows in the dust collecting chamber 36 with rotation of the rotary brush 2 as shown in FIG. The flow rate of the airflow flowing into the dust collecting chamber 36 passing through the airflow passage 34 has a problem of low dust collection efficiency.

In addition, as the rotary brush 2 rotates in the counterclockwise direction as indicated by the arrow, the gap W formed between the brush cover wall 93 and the outer peripheral end of the brush portion 21 of the rotary brush 2 is formed. As shown by the arrow, air is wound up, and the wound air is a stream of air from the dust suction port 3 to the front of the dust collector, and blows the dust 53 on the bottom surface 5 in the direction indicated by the arrow. There was a problem blowing. Moreover, the dust sweeped up by the rotary brush 2 may be wound up by the said gap W, and may not be collected in the dust collecting chamber 36. FIG.

In addition, the airflow introduced from the dust suction port 3 collides with the end portion 93a of the brush cover wall 93, and as shown by the arrow, turbulence occurs in the airflow, so that the flow rate of the airflow flowing into the dust collecting chamber 36 decreases. There was a problem of low dust collection efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a sectional view of a dust collector of a first embodiment according to the present invention.

2 is an enlarged cross-sectional view of the dust collecting device.

Fig. 3 is an enlarged cross sectional view of the dust collector of the second embodiment according to the present invention;

4 is an enlarged sectional view of an essential part of the dust collecting device.

Fig. 5 is a sectional view of the dust collector of the third embodiment according to the present invention.

6 is an enlarged cross-sectional view of the dust collecting device.

Fig. 7 is a sectional view of the dust collector of the fourth embodiment according to the present invention.

8 is an enlarged cross-sectional view of the dust collecting apparatus.

9 is a cross-sectional view of a conventional dust collecting device.

10 is an enlarged cross-sectional view of the dust collecting device.

<Explanation of symbols for the main parts of the drawings>

1, 10: dust collector

2: rotating brush

3: dust intake

5: floor surface

6: operation handle

11, 12: housing

13, 14: floor wall

21: brush part

21a: outer circumferential end

22: rotating shaft

31: dust collecting member

32: motor

33: secondary battery

34: airflow passage

36: dust collection room

37: filter

38: exhaust port

39: rotating brush storage room

41: driving roller

53: dust

61: airflow guide wall

70: dust collecting wall

71: dust check valve

71a: fixed end

71b: free end

80 wall

81: airflow guide wall

81a: upper part

83, 93: brush cover wall

83a, 93a: end

It is therefore an object of the present invention to provide a dust collecting device having a higher dust collection efficiency than in the prior art. In the dust collecting apparatus according to the present invention, the dust inlet 3 is opened and installed in the bottom wall 13 of the housing 11, and the rotary brush accommodating chamber 39 and the dust collecting chamber 36 are provided in the housing 11 together. The rotary brush accommodating chamber 39 passes through the airflow passage 34 and is connected to the dust collecting chamber 36. The rotary brush 2 is disposed in the rotary brush accommodating chamber 39, and the outer circumferential end 21a of the rotary brush 2 is located on the bottom surface by the rotation of the rotary brush 2 toward the dust suction port 3. It is possible to sweep up the dust and collect it in the dust collecting chamber 36 through the airflow passage 34.

The housing 11 is provided with a brush cover wall 83 facing the rotary brush accommodation chamber 39 and covering the top of the rotary brush 2, and between the rotary brush accommodation chamber 39 and the dust collection chamber 36. An airflow guide wall 81 is provided to rapidly rise from the bottom wall of the housing 11 and to guide the airflow from the dust intake port 3 to the vertically upward direction. The airflow passage 34 is formed between the upper end portion 81a of the airflow guide wall 81 and the end portion 83a of the dust collecting chamber side of the brush cover wall 83.

In the dust collector of the present invention, the air flow introduced from the dust suction port 3 is guided upwardly vertically along the wall surface of the air flow guide wall 81 and is introduced into the dust chamber 36, so that the air flow direction coincides in one direction. As a result, the generation of airflow that rotates inside the dust chamber as in the conventional dust collector is suppressed. As a result, the flow rate of the airflow is increased, and the intake airflow is generated at the dust suction port 3. As a result, the dust collection efficiency is higher than that of the conventional dust collector.

In a specific configuration, the brush cover wall 83 of the housing 11 is formed in a cylindrical shape coaxial with the rotation shaft 22 of the rotation brush 2, and the brush cover wall 83 and the rotation brush 2 are formed. The gap g formed between the outer circumferential end portions 21a is set smaller than the gap d formed between the air flow guide wall 81 and the outer circumferential end portion 21a of the rotary brush 2. According to this specific configuration, since the gap g between the brush cover wall 83 and the outer circumferential end portion 21a of the rotary brush 2 is narrow, the amount of air wound in the gap g is very small. Therefore, with the rotation of the rotary brush 2, the flow volume of the airflow which blows out from the dust suction port 3 to the front of a dust collector becomes small enough. In addition, since the amount of air wound in the gap g is very small, the amount of dust wound in the gap g is greatly reduced.

In a more specific configuration, the dust collecting wall 70 protrudes toward the inside of the dust collecting chamber 36 at the upper end 8la of the airflow guide wall 81. According to the above specific configuration, when the dust collecting chamber 36 is positioned above the rotary brush accommodating chamber 39, the dust in the dust collecting chamber 36 moves on the airflow guide wall 81. Since the dust collecting wall 70 protrudes toward the interior of the dust collecting chamber 36 at the upper end 81a of the airflow guide wall 61, the dust on the airflow guide wall 61 is applied to the dust collecting wall 70. It picks up by this and does not fall from the airflow passage 34. In this way, backflow of the dust in the dust collecting chamber 36 to the rotary brush accommodating chamber 39 is prevented.

As described above, according to the dust collector of the present invention, since the flow rate of the airflow flowing through the dust suction port into the dust collecting chamber is sufficiently large, suction airflow is generated at the dust suction port, and the dust on the bottom surface is caused by the suction airflow to the dust collecting chamber. Is inhaled. In addition, since the flow rate of the airflow emitted from the dust intake port to the front of the dust collector is sufficiently small, there is no fear of blowing dust to the front of the dust collector. As a result, the dust collection efficiency is higher than that of the conventional dust collector.

EMBODIMENT OF THE INVENTION Hereinafter, the several Example of this invention is described concretely based on drawing.

(First embodiment)

As shown in FIG. 1, the dust collecting apparatus of this embodiment is provided with the housing 11 and the rotating brush 2 accommodated in the housing 11, and the operation handle 6 is attached to the housing 11 upper surface. In the housing 11, a rotary brush accommodating chamber 39 for storing the rotary brush 2 and a dust collecting chamber 36 for accumulating dust are formed, and a motor generating power for rotating the rotary brush 2 is provided. 32 and a secondary battery 33 for supplying electric power to the motor 32 are housed. The rotary brush 2 has a rotary shaft 22 and a brush portion 21 formed on the outer circumferential surface of the rotary shaft 22, and one end of the rotary shaft 22 is connected to the rotary shaft of the motor 32 via a belt. have. The brush part 21 is comprised by the tuft line not shown formed in the outer peripheral surface of the rotating shaft 22, and a tuft row is formed spirally in the direction of a rotation axis.

The airflow guide wall 81 protrudes upward from the housing 11 bottom wall 13 toward the inside of the housing 11. The airflow guide wall 81 forms a cylindrical surface coaxial with the rotation shaft 22 of the rotation brush 2, and is integrally formed with the bottom wall 13 of the housing 11 to form the rotation brush accommodation chamber 39 and the dust collection chamber ( 36) Partially partitioned between. In addition, the dust inlet 3 is open at the bottom wall 13 of the housing 11, and the tip of the brush portion 21 protrudes from the dust inlet 3, and is located at the rear of the rotary brush 2. The dust collecting member 31 protrudes toward the bottom surface 5 at the opening edge of the dust suction port 3 located in the bottom. Four corners of the housing bottom wall 13 are mounted with a traveling roller 41.

The housing 11 is provided with a brush cover wall 83 that faces the rotary brush accommodating chamber 39 and covers the upper part of the rotary brush 2, and has an end portion at the dust collecting chamber 36 side of the brush cover wall 83. An airflow passage 34 is formed between the 83a and the upper end portion 81 of the airflow guide wall 81. The brush cover wall 83 is formed in a cylindrical shape coaxial with the rotary shaft 22 of the rotary brush 2, and the outer peripheral end portion 21a of the brush portion 21 of the rotary brush 2 as shown in FIG. It has a gap g between them. The gap g has a size of 1 mm or less and is formed smaller than the gap d between the airflow guide wall 81 and the outer circumferential end 21a of the brush part 21 of the rotary brush 2. The size of the gap g may be 0 mm, that is, a state in which the outer circumferential end portion 21a of the brush portion 21 of the rotary brush 2 is in contact with the inner wall of the brush cover wall 83. A plurality of exhaust ports 38 are openly provided on the upper wall of the dust collecting chamber 36, and a filter 37 is attached to the wall surface surrounding the dust collecting chamber 36 at a position covering the exhaust opening 38.

In the dust collector 1 of the present embodiment, as shown in FIG. 2, the rotary brush 2 is driven to rotate to flow into the dust chamber 36 from the dust suction port 3 through the airflow passage 34. Airflow is formed. Here, the airflow introduced from the dust suction port 3 is guided substantially vertically upward along the wall surface of the airflow guide wall 81, and the directions of the airflows coincide with each other. Occurrence is suppressed. As a result, the flow rate of the airflow is increased, and the intake airflow is generated at the dust suction port 3.

As a result, the dust swept up by the rotation of the rotation direction of the rotary brush 2 is guided upwardly vertically along the wall surface of the airflow guide wall 81, and is indicated by the arrow flowing into the dust collecting chamber 36. Likewise, the air flows through the air flow passage 34 and is accommodated in the dust collecting chamber 36. The air in the dust collecting chamber 35 passes through the filter 37 and is discharged from the plurality of exhaust ports 33 open to the upper wall of the dust collecting chamber 36.

Moreover, in the dust collector of this embodiment, the clearance g between the brush cover wall 83 and the outer peripheral end 21a of the brush portion 21 of the rotary brush 2 is very narrow, and the airflow guide wall 81 and The gap d formed between the outer circumferential end 21a of the rotary brush 2, or the brush cover wall 83 of the conventional dust collector shown in FIG. 10 and the brush portion 21 of the rotary brush 2 Since it is narrower than the clearance gap W between the outer peripheral end portions 21a, the amount of air wound in the clearance gap g is small. As a result, the flow volume of the airflow which blows forward of the dust collector 1 with rotation of the rotating brush 2 becomes small enough. In addition, since the amount of airflow wound in the gap g is small, the amount of dust wound in the gap g is greatly reduced.

(2nd Example)

In the dust collector of the present embodiment, as shown in FIG. 3, the end portion 83a of the airflow passage 34 side of the brush cover wall 83 protrudes toward the airflow passage 34, and the tip portion thereof is shown in FIG. It is pointed at an acute angle α as shown in FIG. In the dust collector of the present embodiment, the configuration other than the end portion 83a of the brush cover wall 83 is the same as the configuration other than the end of the brush cover wall in the dust collector of the first embodiment, and thus description thereof is omitted.

In the dust collector 1 of the present embodiment, similar to the dust collector of the first embodiment, an air flow flowing from the dust suction port 3 through the air flow passage 34 and into the dust chamber 36 is formed, and the air flow guide wall ( The airflow coincides in one direction by 81), so that the generation of airflow that rotates inside the dust chamber as in the conventional dust collector is suppressed. As a result, the flow rate of the airflow is increased, and the intake airflow is generated at the dust suction port 3. As a result, the dust swept up by the rotation of the rotary brush 2 in the direction of the arrow is received in the dust collecting chamber 36 through the airflow passage 34 as in the first embodiment, and the air in the dust collecting chamber 36 Is discharged from the exhaust port 3S through the filter 37.

Further, in the dust collector of the present embodiment, the end portion 83a of the brush air flow passage 34 side of the brush cover wall 83 protrudes toward the air flow passage 34 so that the tip thereof is sharp at an acute angle. As shown, most of the airflow guided upwardly along the wall surface of the airflow guide wall 81 flows into the dust collecting chamber 36 without being disturbed by the collision with the end portion 83a. As a result, the flow rate of the airflow flowing into the dust collecting chamber 36 increases, and as a result, a larger suction airflow is generated.

Further, since the gap between the brush cover wall 83 and the outer circumferential end 21a of the brush portion 21 of the rotary brush 2 is sufficiently narrow, the amount of air wound in the gap is very small, and the rotary brush 2 The flow rate of the air stream emitted to the front of the dust collector in accordance with the rotation of the is very small. In addition, the amount of dust wound in the gap is also very small.

As described above, according to the dust collecting apparatus according to the present invention, the flow rate of the airflow flowing from the dust intake port 3 through the airflow passage opening 34 into the dust collecting chamber 36 is increased, and the intake airflow in the dust intake port 3 is increased. Is generated, the dust collection efficiency is improved compared to the conventional dust collector. In addition, there is no risk of blowing dust in front of the dust collecting apparatus, and the amount of dust wound in the gap between the brush cover wall 83 and the outer peripheral end 21a of the brush portion 21 of the rotary brush 2 Since it is greatly reduced, the dust collection efficiency is significantly improved compared to the conventional dust collector.

(Third Embodiment)

The dust collector of the present embodiment has a housing 11 and a rotating brush 2 housed in the housing 11 as shown in FIG. 5, and the operation handle 6 is provided with a housing 11 via an attachment portion 61. ) It is attached to the upper surface. In the housing 11, a rotary brush accommodating chamber 39 for accommodating the rotary brush 2 and a dust collecting chamber 36 for accumulating dust are formed and a motor 32 for rotating the rotary brush 2 is provided. And a secondary battery 33 for supplying electric power to the motor 32 is housed. The rotary brush 2 has a rotary shaft 22 and a brush portion 21 formed on the outer circumferential surface of the rotary shaft 22, and one end of the rotary shaft 22 is connected to the rotary shaft of the motor 32 via a belt. have. The brush part 21 is comprised by the tuft line not shown formed in the outer peripheral surface of the rotating shaft 22, and the tuft row is helically extended in the direction of a rotation axis.

The airflow guide wall 81 protrudes upward from the housing 11 bottom wall 13 toward the inside of the housing 11. The airflow guide wall 81 forms a cylindrical surface coaxial with the rotation shaft 22 of the rotation brush 2, and is integrally formed with the bottom wall 13 of the housing 11 to form the rotation brush accommodation chamber 39 and the dust collection chamber ( 36) Partially partitioned between. The upper end 81 of the airflow guide wall 81 is formed with a dust collecting wall 70 extending substantially parallel to the bottom wall 13 toward the interior of the dust collecting chamber 36.

The dust inlet 3 is open at the bottom wall 13 of the housing 11, and the tip end of the brush portion 21 protrudes from the dust inlet 3. A dust collecting member 31 protrudes toward the bottom surface 5 at the rear opening edge of the dust suction port 3. In addition, four corners of the housing bottom wall 13 are equipped with a traveling roller 41.

The housing 11 is provided with a brush cover wall 83 that faces the rotary brush accommodating chamber 39 and covers the upper part of the rotary brush 2. The brush cover wall 83 is formed in the cylindrical surface coaxial with the rotating shaft 22 of the rotation brush 2, the edge part 81 of the dust collection chamber 36 side of the brush cover wall 83, and an airflow guide wall. An airflow passage 34 is formed between the upper ends 81 of 81. A plurality of exhaust ports 38 are open on the upper wall of the dust collecting chamber 36, and a filter 37 is attached to the wall surface on which the exhaust ports 38 are open.

At the time of storing the dust collector 1 of the present embodiment, the operation handle 6 is knocked down in the direction of the arrow indicated by the dashed-dotted line in FIG. 5, and the housing 11 is shown in FIG. 6 as shown in FIG. 6. The front surface 14 is raised to stand in contact with the bottom surface 5 to stand.

In the dust collector 1 of the present embodiment, the rotary brush 2 is driven to rotate to form an air flow flowing from the dust suction port 3 through the air flow passage 34 and into the dust chamber 38. Here, the airflow introduced from the dust intake port 3 is guided upwardly vertically along the wall surface of the airflow guide wall 81, so that the directions of the airflows coincide with each other, so that the flow rate of the airflow increases and is sucked in the dust intake port 3. Airflow occurs. As a result, the dust sweeped up by the rotation of the rotary brush 2 in the direction of the arrow is guided substantially vertically upward along the wall surface of the airflow guide wall 81 and passes through the airflow passage 34 to collect the dust collecting chamber 36. Is collected within. Air in the dust collecting chamber 36 passes through the filter 37 and is discharged from the plurality of exhaust ports 38 open to the upper wall of the dust collecting chamber 36.

At the time of storing the dust collector 1, as shown in FIG. 6, the housing 11 is self-supporting so that the dust collecting chamber 36 is located above the rotary brush accommodating chamber 39, and the bottom wall of the housing 11 is shown. The dust 53 accumulated on the 13 moves on the wall surface 80 of the airflow guide wall 81 as shown in Fig. 6, but these dusts 53 are transferred to the airflow guide wall 81. Since it is picked up by the dust collecting wall 70 protruding to the tip portion 81a, it does not fall from the airflow passage 34. In this way, backflow of the dust to the rotary brush accommodation chamber 39 at the time of storage is prevented.

(Example 4)

In the dust collector of this embodiment, as shown in Fig. 7, a dust backflow prevention valve 71 made of a vinyl sheet blocks the airflow passage 34. The dust backflow prevention valve 71 is fixed to the upper end portion as a fixed end portion 71a, and is fixed to the wall surface above the airflow passage 34, and the lower end portion is a free end portion 71b to form an upper end portion of the airflow guide wall 81. It is in contact with 81a. In addition, the dust backflow prevention valve 7l has the flexibility to deform sufficiently by the wind pressure of the airflow generated by the rotational drive of the rotary brush 2. In the dust collecting apparatus of the present embodiment, the configuration of each part other than the dust backflow prevention valve 71 is the same as that of the dust collecting apparatus of the third embodiment, and therefore the same reference numerals will be omitted.

In the dust collector 1 of the present embodiment, the dust backflow prevention valve 71 is draped downward by its own weight as indicated by the solid line when the dust collection operation is stopped, thereby blocking the airflow passage 34. In the dust collection operation, the rotary brush 2 is driven to rotate to generate airflow from the dust suction port 3 toward the airflow passage 34. Due to the wind pressure of the air flow, the dust backflow prevention valve 71 is deformed as indicated by the dashed-dotted line, and the air flow passage 34 is opened. Thereby, the airflow which flows in through the airflow passage 34 from the dust suction port 3 into the dust collection chamber 36 is formed. Since the airflow coincides in one direction by the airflow guide wall 81, the flow rate is increased to generate the intake airflow at the dust intake port 3. As a result, the dust swept up by the rotation of the rotary brush 2 in the direction of the arrow passes through the airflow passage 34 and is collected in the dust collecting chamber 36, and the air in the dust collecting chamber 36 passes through the filter 37. It is discharged from the exhaust port 33.

At the time of storing the dust collecting apparatus 1, as shown in FIG. 3, the housing 11 is self-supporting, so that the dust collecting chamber 36 is located above the rotary brush accommodating chamber 39, so that the bottom of the housing 11 is located. The dust 63 accumulated on the wall 13 moves on the wall surface 80 of the airflow guide wall 81 as shown in FIG. 8, but the dust backflow prevention valve 71 is not stopped at the dust collection operation. Similarly, since the airflow passage 34 is blocked, these dusts 53 are picked up by the dust backflow prevention valve 71 and do not fall from the airflow passage 34. In this way, backflow of the dust to the rotary brush accommodation chamber 39 at the time of storage is prevented.

In addition, the dust backflow prevention valve 71 has a strength that does not bend largely by the weight of the dust, and the free end portion 71b extends beyond the upper end portion 81a of the airflow guide wall 81 and rotates in the rotating brush receiving chamber ( It overlaps with the upper end 81a of the airflow guide wall 81 in sufficient area so that it may not move to the 39) side.

In the third and fourth embodiments, the case where the dust collecting device is accommodated has been described as an example. However, the case where the dust collecting device is transported in the state where the dust collecting device is set up is also carried out in the same manner as when the dust collecting device is stored. Backflow of the dust 53 in the 36 into the rotary brush accommodation chamber 39 is prevented. In addition, when the dust collecting apparatus crosses a step or the like in the posture of the dust collecting operation as shown in Figs. 5 and 7, the dust 53 that has blown up in the dust collecting chamber 36 is a dust collecting wall 70 or the like. Since it is taken out by the dust backflow prevention valve 71, it is prevented that the dust 53 flows back through the airflow passage 34 to the rotary brush accommodation chamber 39.

In addition, the structure of each part of this invention is not limited to the structure of the said Example, A various deformation | transformation is possible within the technical scope as described in a claim. For example, a rotating brush is not limited to the structure which is rotationally driven by rotation of a motor, It can also be set as the structure using what is called a turbo brush by which rotational force is provided and rotated by airflow. Moreover, it can also be set as the structure which used a motor and a suction fan together.

According to the present invention having the configuration as described above, it is possible to provide a dust collecting device with high dust collection efficiency.

Claims (6)

At the same time, the dust inlet 3 is opened and installed in the bottom wall 13 of the housing 11, and the rotary brush accommodating chamber 39 and the dust collecting chamber 36 are provided in the housing 11 together with the rotary brush accommodating chamber 39. ) Is connected to the dust collecting chamber 36 through the air flow passage 34, the rotary brush 2 is disposed in the rotary brush accommodating chamber 39, and the outer peripheral end 21a of the rotary brush 2 is In the dust collector which can sweep up the dust on the bottom surface by the rotation of the rotary brush 2 toward the dust suction port 3, and collect it in the dust collecting chamber 36 through the airflow passage 34, the housing 11 The brush cover wall 83 which faces the rotary brush accommodating chamber 39 and covers the upper part of the rotary brush 2 is provided, and the housing 11 is provided between the rotary brush accommodating chamber 39 and the dust collecting chamber 36. Airflow guide for rapidly rising from the bottom wall to guide the airflow from the dust inlet 3 to approximately vertically upwards (81) is provided, and the airflow passage 34 is formed between the upper end portion 81a of the airflow guide wall 81 and the end portion 81 of the dust collecting chamber side of the brush cover wall 83. Dust collecting device. The brush cover wall (83) of the housing (11) is formed in a cylindrical shape coaxial with the rotary shaft (22) of the rotary brush (2), and the brush cover wall (83) and the rotary brush (2). The gap g formed between the outer circumferential ends 21a of the diaphragm is set smaller than the gap d formed between the airflow guide wall 31 and the outer circumferential end 21a of the rotary brush 2. Dust collecting device. The airflow passage opening side end portion 83a of the brush cover wall 83 of the housing 11 projects toward the airflow passage opening 34, and the tip thereof is sharply sharp. Dust collector. The dust collecting wall (70) of any one of claims 1 to 3, wherein the dust collecting wall (70) protrudes toward the interior of the dust collecting chamber (36) at the upper end portion (81a) of the airflow guide wall (81). cyclone. The airflow passage port (34) is provided with a dust backflow prevention valve (71), and the dust backflow prevention valve (71) is an airflow passage (D) during a dust collecting operation. A dust collecting device, characterized in that the airflow passage (34) is blocked in an upright position by opening the housing (34) so that the dust collecting chamber (36) is located above the rotary brush receiving chamber (39). 6. The dust backflow prevention valve (71) according to claim 5, wherein the dust backflow prevention valve (71) is constituted by a flexible seat, and the flexible seat has a dust collecting chamber (one end portion 71a as a fixed end portion and the other end portion 71b as a free end portion). 36) A dust collecting device, which can be opened to the side.