Vacuum cleaner

Abstract

To provide a vacuum cleaner for restricting dust such as hair and dirt from entangling in a dust collection device.SOLUTION: A vacuum cleaner includes: a cleaner body having an electric blower; and a dust collection part 50 to be attached / detached to / from the cleaner body. The dust collection part 50 has: an outer cylinder 52 including a dust collection part inflow port 52b and an opening part 52a provided on one side in an axial direction; a structure 54 arranged inside the outer cylinder 52; and a dust collection space 56 formed between the outer cylinder 52 and the structure 54. The structure 54 has: a tapered part 70 formed to allow an outer shape to be reduced from one side to the other side in the axial direction; and a first inner cylinder 60 including the tapered part 70 as a dust collection space air-discharge part 80 for discharging air from the dust collection space. An inner space 84 is formed inside the first inner cylinder 60. A third guide part 78 is arranged inside the inner space 84 and is formed to be extended from an inner peripheral surface of the first inner cylinder 60.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a vacuum cleaner. [Background technology]

[0002] Conventionally, there has been provided a vacuum cleaner as disclosed in the following Patent Document 1. This vacuum cleaner is configured to have an inner cylinder with an exhaust port for exhausting air from the center of the dust collection container after air sucked in from an air inlet provided in the circumferential direction of the circumferential part of the dust collection container is swirled along the approximately cylindrical inner circumferential surface, and to collect dust contained in the air at the bottom of the dust collection container. In addition, the inner cylinder of the dust collection container provided in this vacuum cleaner is configured such that a part of the outer circumferential wall is constituted by an inner cylinder filter that filters the air passing through. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-26686 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the conventional technology such as Patent Document 1, there is a problem that dust such as hair and dust is likely to become entangled in the dust collection container due to the swirling airflow formed around the inner cylindrical filter. If such dust becomes entangled in the dust collection container, there is a concern that secondary problems such as a decrease in dust collection performance due to an increase in exhaust resistance and a decrease in maintainability may occur.

[0005] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a vacuum cleaner capable of preventing dust such as hair and dirt from becoming entangled in a dust collecting device. [Means for solving the problem]

[0006] The electric vacuum cleaner of the present invention, provided to solve the above-mentioned problems, comprises a vacuum cleaner body having an electric blower, and a dust collecting device detachable from the vacuum cleaner body, wherein the dust collecting device has an outer tube having an inlet and an opening provided on one side in the axial direction, a structure arranged inside the outer tube, and a dust collecting space formed between the outer tube and the structure, wherein the structure has a tapered portion formed so that the outer shape becomes smaller as it goes from one side to the other side in the axial direction, and a first inner tube provided with the tapered portion as a dust collecting space exhaust portion for exhausting the dust collecting space, wherein inside the first inner tube there is an internal space into which airflow can flow from the outside of the first inner tube, and a third guide portion is formed in the internal space and extends from the inner circumferential surface of the first inner tube.

[0007] In the vacuum cleaner of the present invention, a structure disposed inside the outer cylinder is provided with a tapered section whose outer shape becomes smaller from one side in the axial direction to the other side. As a result, the airflow that flows into the dust collection space through the inlet swirls in the dust collection space due to the influence of the tapered section and moves toward the other side in the axial direction, making it difficult for hair, dust, and other dust to become entangled in the structure disposed inside the outer cylinder. Therefore, according to the present invention, a vacuum cleaner can be provided that can prevent hair, dust, and other dust from becoming entangled in the dust collection device. Effect of the Invention

[0008] According to the present invention, it is possible to provide a vacuum cleaner capable of suppressing entanglement of dust such as hair and dirt in a dust collecting device. [Brief description of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a vacuum cleaner according to an embodiment of the present invention; [Diagram 2] 2 is a perspective view showing a vacuum cleaner body provided in the vacuum cleaner of FIG. 1. FIG. [Diagram 3] 3 is a cross-sectional view of a main part of the vacuum cleaner body of FIG. 2. [Figure 4] 3 is a cross-sectional view showing a dust collecting unit attached to the vacuum cleaner body of FIG. 2. [Diagram 5] FIG. 5 is a perspective view showing the dust collecting section of FIG. 4. [Figure 6] FIG. 5 is an exploded perspective view showing the dust collecting unit of FIG. 4. [Figure 7] 5 is a perspective view showing a state in which a first inner cylinder is disposed inside an outer cylinder in the dust collecting section of FIG. 4. FIG. [Figure 8] 5 is a perspective view showing a first inner cylinder constituting the dust collecting section of FIG. 4. [Figure 9] 5 is an exploded perspective view showing a second inner cylinder included in the dust collecting unit of FIG. 4. [Figure 10] 5 is a cross-sectional view taken along line AA in FIG. 4. [Figure 11] FIG. 11 is a cross-sectional view showing a dust collecting section according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a vacuum cleaner 1 according to one embodiment of the present invention will be described in detail with reference to the drawings. In the following description, the overall configuration of the vacuum cleaner 1 will be briefly described, and then the main parts will be described in more detail. In the following description, unless otherwise specified, the positional relationships in the up-down direction, width direction, front-rear direction, etc. will be described based on the state in which the vacuum cleaner 1 is erected as shown in FIG.

[0011] <Overall configuration of vacuum cleaner 1> As shown in Fig. 1, the vacuum cleaner 1 is a vacuum cleaner having a stick-shaped (vertical) appearance. The vacuum cleaner 1 can be, for example, a rechargeable type, or a type that obtains power from an external power source via a power cord. As shown in Fig. 1, the vacuum cleaner 1 includes a vacuum cleaner body 10, a dust collection section 50 (dust collection device), a suction port body 100, a pipe section 110, and a cleaning tool 130.

[0012] The vacuum cleaner main body 10 constitutes the main body of the electric vacuum cleaner 1 and is the part that exerts suction power and performs the function of collecting dust. Specifically, as shown in Figures 2 and 3, the vacuum cleaner main body 10 is configured by incorporating an electric blower 14 for sucking in air and generating an airflow, a battery 18, a board unit 20, and other parts inside a main body case 12 that forms a housing.

[0013] The vacuum cleaner body 10 includes a grip part 16. The grip part 16 is a part provided to allow a user of the vacuum cleaner 1 to grip the vacuum cleaner body 10. That is, the vacuum cleaner 1 is configured so that the user can grip the vacuum cleaner body 10, for example, by passing the user's fingers, except for the thumb, through an opening formed by the grip part 16. The vacuum cleaner body 10 has an exhaust port 15 (see FIG. 1) for discharging air exhausted from the electric blower 14, on at least one side in the left-right direction based on the front-rear direction in which the grip part 16 extends.

[0014] As shown in FIG. 3, the vacuum cleaner body 10 has an air passage forming section 38. The air passage forming section 38 is a section forming an air passage 38b communicating with the dust collecting section 50. The air passage forming section 38 is formed on the rear side of the dust collecting section 50 so as to extend in the vertical direction. The air passage 38b has an air passage outlet 38x connected to the dust collecting section inlet 52b of the dust collecting section 50. The air passage 38b also has a suction port 38y that functions as a connection port for connecting the pipe section 110 and the suction port body 100. The suction port 38y is a section that serves as an inlet for air sucked through the pipe section 110 and the suction port body 100. The suction port 38y opens at the lower end side of the air passage forming section 38.

[0015] Dust collection unit 50 is a portion where dust sucked by vacuum cleaner 1 is collected. As shown in Figs. 1 to 3, dust collection unit 50 is provided so as to be continuous with vacuum cleaner body 10. Dust collection unit 50 has a characteristic configuration in vacuum cleaner 1, and therefore the specific structure will be described in detail later.

[0016] 1, the tube section 110 is a cylindrical member that detachably connects the vacuum cleaner body 10 and the suction port body 100. One end of the tube section 110 is shaped so that it can be inserted into a suction port 38y provided in the vacuum cleaner body 10, and the other end is shaped so that it can be connected to the suction port body 100. By connecting the vacuum cleaner body 10 and the suction port body 100 via the tube section 110, a continuous path (air passage) can be formed from the suction port body 100 to the vacuum cleaner body 10.

[0017] The suction port body 100 is connected directly to the suction port 38y of the vacuum cleaner body 10, or indirectly via a pipe section 110. The suction port body 100 has a suction port 103 and a joint section 104. The suction port 103 opens toward the bottom surface. The joint section 104 is connectable to the suction port 38y or the pipe section 110.

[0018] The cleaning tool 130 has a mop 132 and a mop storage case 134. The cleaning tool 130 allows the mop 132 to be inserted and removed in the axial direction from the mop storage case 134 attached to the rear side of the pipe portion 110. In addition to cleaning by sucking in dust at the suction port body 100 and the like, the vacuum cleaner 1 can also remove the mop 132 from the mop storage case 134 and use it for cleaning.

[0019] The electric vacuum cleaner 1 is roughly configured as described above. The electric vacuum cleaner 1 has a characteristic structure in each part, such as the dust collecting part 50 and the suction mouth body 100. The structure of each part of the electric vacuum cleaner 1 will be described in more detail below.

[0020] <Configuration of dust collecting unit 50> The dust collecting section 50 will be described in detail below with reference to Figs. 4 to 10. The dust collecting section 50 is provided so as to be detachable from the vacuum cleaner body 10. The dust collecting section 50 is a so-called cyclone type dust collecting device. That is, the dust collecting section 50 is capable of collecting dust in the process of introducing air from a dust collecting section inlet 52b provided in the outer cylinder 52, forming a swirling air current in the outer cylinder 52, and discharging the air. The dust collecting section 50 can be of a so-called single-stage or multi-stage separation type, but in this embodiment, a single-stage separation type is adopted.

[0021] 4 and other figures, the dust collection unit 50 has an outer cylinder 52 (dust cup) and a structure 54, with a dust collection space 56 formed therebetween. The dust collection unit 50 is capable of forming a swirling air current that swirls air introduced into the dust collection space 56 between the structure 54 and the outer cylinder 52. The dust collection unit 50 is detachably attached to a position below the electric blower housing 34 in the vacuum cleaner body 10.

[0022] The outer cylinder 52 is a container for accumulating dust inside. The outer cylinder 52 is a cylinder with an open upper end. As shown in Figs. 4 to 6, the outer cylinder 52 is a bottomed cylinder having an opening 52a on one axial side (upper side in the illustrated example) and an outer cylinder bottom 52c on the other axial side (lower side in the illustrated example). The outer cylinder bottom 52c may have a lid that can be opened and closed to discard dust accumulated in the outer cylinder 52. The outer cylinder 52 also has a dust collection inlet 52b (inlet) on the periphery.

[0023] The dust collection unit inlet 52b is an inlet for introducing air that is sucked into the air passage 38b from the suction port 38y and discharged from the air passage exhaust port 38x. The dust collection unit inlet 52b is provided at a position corresponding to the air passage exhaust port 38x, for example, at the middle part in the axial direction (up-down direction) of the outer cylinder 52. Therefore, by attaching the dust collection unit 50 to the vacuum cleaner body 10, the dust collection unit inlet 52b and the air passage exhaust port 38x can be communicated with each other. In addition, the dust collection unit inlet 52b can introduce the air discharged from the air passage exhaust port 38x into the inside of the dust collection space 56 in the tangential direction of the inner peripheral surface of the outer cylinder 52. Therefore, the air introduced into the inside of the dust collection space 56 from the dust collection unit inlet 52b forms a swirling flow that flows along the inner peripheral surface of the outer cylinder 52.

[0024] As shown in FIG. 4 and FIG. 6, the structure 54 is a member disposed inside the outer cylinder 52. The structure 54 is a member that constitutes a dust collection space 56 into which air flows between the structure 54 and the outer cylinder 52. The structure 54 is disposed so that the axial center position is approximately the same as that of the outer cylinder 52. The structure 54 has a portion (tapered portion 70 described later) formed so that the outer shape becomes smaller from one side (upper side in the figure) in the axial direction toward the other side (lower side in the figure). The structure 54 has a first inner cylinder 60 (inner cylinder) and one side cylinder portion 64, and further has a connector 62, which is not an essential component. The first inner cylinder 60 is connected to the one side cylinder portion 64, and when the connector 62 is provided, it is connected to at least one of the one side cylinder portion 64 and the connector 62.

[0025] 4, 7, 8, etc., the first inner tube 60 has a tapered portion 70, and preferably an extending portion 72. The first inner tube 60 also has a first guide portion 74 and a second guide portion 76 on the outer periphery of the tapered portion 70, and a third guide portion 78 on the inner periphery of the tapered portion 70, although this is not an essential configuration.

[0026] The tapered portion 70 is a portion formed so that the outer shape becomes smaller from one axial side (upper side in the figure) to the other axial side (lower side in the figure). The tapered portion 70 is formed in a truncated cone shape, and is formed so that the outer circumferential surface is linearly inclined toward the axial center as it moves from one axial side to the other axial side. The tapered portion 70 is open toward one axial side (upper side), while including a closed portion 70a that is closed on the other axial side (lower side).

[0027] As shown in FIG. 4, the tapered portion 70 is formed so that the outer diameter of the large diameter portion 70b on one side in the axial direction is approximately equal to the inner diameter of the outer tube 52. In addition, a circumferential groove 70c extending in the circumferential direction is provided on the outer peripheral surface of the large diameter portion 70b. The tapered portion 70 can form a first sealing portion 73 that seals a gap formed between the inner peripheral surface of the outer tube 52 and the tapered portion 70 by an airtight member (first airtight member 70d) made of an O-ring or the like attached to the circumferential groove 70c. That is, by setting the tapered portion 70 inside the outer tube 52 with the blocking portion 70a facing the outer tube bottom portion 52c side, the first sealing portion 73 is formed in which the first airtight member 70d attached to the circumferential groove 70c and the inner peripheral surface of the outer tube 52 are in close contact with each other. In addition, a dust collection space 56 is formed between the tapered portion 70 (first inner tube 60) and the outer tube 52 on the other axial direction side (the outer tube bottom portion 52c side of the outer tube 52) of the first sealing portion 73. In addition, the first sealing portion 73 is formed above the dust-collection portion inlet 52b that communicates with the dust-collection space 56.

[0028] The tapered portion 70 has a function of forming the dust collection space 56 as described above, and also a function of the dust collection space exhaust portion 80 for exhausting air from the dust collection space 56. Specifically, the tapered portion 70 has a large number of vent holes 70e formed in the circumferential direction so as to communicate the inside and outside. The tapered portion 70 may be formed by resin molding, or may be formed by a mesh member 82. The mesh member 82 is a mesh-like member formed of a resin material, a metal material, or a combination of these. Therefore, dust contained in the air passing through the vent holes 70e forming the dust collection space exhaust portion 80 can be captured by the mesh member 82. The surface of the tapered portion 70 is smoother when the tapered portion 70 is formed by resin molding than when the mesh member 82 is formed, so that it is possible to reduce the catching of dust.

[0029] The extension portion 72 is a portion formed so as to extend further from the tapered portion 70 toward the other side in the axial direction, but in this embodiment, it extends toward the other side in the axial direction from the end portion on the other side in the axial direction (the lower end portion in the illustrated example) as the base end. The extension portion 72 is formed so as to be spaced apart from the outer tube bottom portion 52c toward one side in the axial direction (the upper side in the illustrated example) inside the dust collection space 56. The extension portion 72 is formed so as to surround the periphery of the blocking portion 70a. As a result, the extension portion 72 has a cylindrical shape whose upper end side is blocked by the blocking portion 70a and whose lower end side is open. Since the extension portion 72 is provided so as to surround the periphery of the blocking portion 70a, airflow and dust that fly up from the bottom of the outer tube 52 at the axial center position of the dust collection space 56 collide with the blocking portion 70a, and are less likely to spread in a direction intersecting the axial direction. As a result, in the vacuum cleaner 1, dust such as hair and dirt contained in the airflow is less likely to become entangled in the tapered portion 70. The extension portion 72 is cylindrical. It is preferable that the extension portion 72 is cylindrical with the same outer dimensions from the upper end to the lower end, or is a tapered cylindrical shape whose outer dimensions become smaller from the upper end to the lower end. This makes it possible to prevent the airflow and dust that have been guided by the first guide portion 74 and smoothly guided toward the other axial side (outer cylinder bottom portion 52c) from becoming entangled in the extension portion 72. Note that the extension portion 72 is not limited to being cylindrical, and may be configured to have a configuration in which a plurality of extension members extending in the axial direction are provided at intervals from each other.

[0030] Furthermore, the blocking portion 70a may have a convex shape on the center side toward the bottom of the outer cylinder 52 with respect to the outside, and more preferably may be curved. This makes it easier for the air current and dust that have risen from the bottom of the outer cylinder 52 at the axial center position of the dust collection space 56 to move toward the extending portion 72 by the blocking portion 70a.

[0031] In addition, the outer tube bottom 52c formed integrally as the bottom of the outer tube 52, or the lid-shaped outer tube bottom 52c that is pivotally supported via a support shaft provided on the periphery of the outer tube 52 so as to be able to open and close the bottom of the outer tube 52, may be provided with a plurality of ribs (projections) 52d that restrict the movement of dust by the swirling air current. The plurality of ribs 52d extend toward the structure 54 and are arranged at intervals in the circumferential direction. In addition, the outer tube bottom 52c formed integrally as the bottom of the outer tube 52 or the outer tube bottom 52c that is shaped like a lid that is able to open and close the bottom of the outer tube 52 as described above may be provided with a projection extending toward the structure 54 (the blocking portion 70a) instead of or in addition to the plurality of ribs 52d. When a projection is provided together with the plurality of ribs 52d, the plurality of ribs 52d are arranged at intervals around the projection in a direction intersecting the axis (in the present embodiment, the radial direction). The protruding portion is columnar, and may be, for example, a cylindrical, rectangular, or cross-shaped column, or a cylindrical, rectangular, or cross-shaped column tapered toward the structure 54. This makes it possible to prevent dust that has gathered below the blocking portion 70a from being moved by air currents. If the bottom of the outer tube 52 is formed as an outer tube bottom portion 52c that is shaped like a lid that can be opened and closed by rotating, dust can be easily disposed of even if it becomes entangled in the protruding portion or the rib 52d.

[0032] As shown in FIG. 7 and FIG. 8, the first guide portion 74 is a rib-like portion provided on the outer periphery of the tapered portion 70 and abuts against the inner periphery of the outer tube 52. The first guide portion 74 is disposed between the outer tube 52 and the first inner tube 60 in a state in which the structure 54 is inserted into the outer tube 52 with the tapered portion 70 and the extending portion 72 facing the outer tube bottom portion 52c side. The first guide portion 74 functions as a guide member for guiding the airflow that flows from the dust collection portion inlet 52b into the dust collection space 56 and swirls in a direction along the inner circumference of the outer tube 52 to the other side in the axial direction (the outer tube bottom portion 52c side). The first guide portion 74 extends so as to approach the dust collection portion inlet 52b as it moves from one side to the other side in the axial direction (from the upper side to the lower side in the illustrated example). An end of the first guide portion 74 may reach the dust collection portion inlet 52b. In other words, the first guide portion 74 extends from one side to the other side in the axial direction (from the upper side to the lower side in the illustrated example) so as to approach the dust collection portion inlet 52b from a position upstream in the swirling direction of the airflow relative to the dust collection portion inlet 52b. Note that, although the first guide portion 74 has been described as being provided on the structure 54, it may be provided on the inner peripheral surface of the outer tube 52. In this case, it is preferable that the first guide portion 74 abuts against the outer peripheral surface of the tapered portion 70 (structure 54).

[0033] The second guide portion 76 is a rib-like portion provided on the outer periphery of the tapered portion 70, similar to the first guide portion 74. The second guide portion 76 is a rib that functions as a guide member for guiding the airflow flowing from the dust-collecting portion inlet 52b into the dust-collecting space 56. The second guide portion 76 is formed between the outer tube 52 and the first inner tube 60 so as to intersect with the axial direction and extend along the swirling direction. The second guide portion 76 is connected to the terminal end of the first guide portion 74 described above.

[0034] The third guide portion 78 is a rib-like portion provided on the inner circumferential side of the first inner tube 60. The third guide portion 78 is disposed inside the internal space 84 of the first inner tube 60. A plurality of third guide portions 78 are provided in the internal space 84 at predetermined intervals in the circumferential direction. The third guide portion 78 is formed so as to extend from one circumferential side to the other side of the internal space 84. In this embodiment, in a state in which the structure 54 is cut along a plane perpendicular to the axial direction and viewed from one axial side (upper side), the third guide portion 78 is formed so that the tip portion (free end) is located at a position away from the base end portion (connection portion with the inner circumferential surface of the tapered portion 70) in the clockwise direction (the same direction as the turning direction). Note that, when the connector 62 is provided, the third guide portion 78 is disposed in the internal space 84 formed between the tapered portion 70 (first inner tube 60) and the connector 62.

[0035] The connector 62 functions as an airflow outlet 67 for discharging the air that has flowed into the dust collection space 56 to the outside of the dust collection section 50. Although not essential, the airflow outlet 67 may have a filter. The connector 62 may be detachably connected to the first inner cylinder 60. In this case, the other axial end of the connector 62 is connected to the inside of the first inner cylinder 60. As shown in FIG. 4 and other figures, the connector 62 is, for example, a cylindrical frame. In the following, the connector 62 will be described as a second inner cylinder 62A as an example. The second inner cylinder 62A is disposed inside the first inner cylinder 60 (on the axial center side of the dust collection section 50). The second inner cylinder 62A is connected to both or one of the first inner cylinder 60 and the one-side cylinder portion 64. In this embodiment, the second inner cylinder 62A is connected to the first inner cylinder 60. As a result, an internal space 84 is formed between the first inner cylinder 60 and the second inner cylinder 62A. A plurality of the third guide portions 78 described above are provided inside the internal space 84 at predetermined intervals in the circumferential direction.

[0036] As shown in FIG. 9, the second inner cylinder 62A has a second inner cylinder outer frame 90, a second inner cylinder inner frame 92, and a second inner cylinder filter 94 (filter).

[0037] The second inner cylinder outer frame 90 is cylindrical and has a support portion 90a and an opening 90b in the middle in the axial direction. The support portion 90a is a columnar portion extending in the axial direction, and a plurality of support portions 90a (four in this embodiment) are provided at predetermined intervals in the circumferential direction of the second inner cylinder outer frame 90. The opening portion 90b is an opening in the second inner cylinder outer frame 90 between the support portions 90a, 90a aligned in the circumferential direction.

[0038] The second inner cylinder inner frame 92 is a cylindrical member disposed inside the second inner cylinder outer frame 90. The second inner cylinder inner frame 92 has a support portion 92a and an opening portion 92b in the middle portion in the cylindrical axis direction. The support portion 92a is a columnar portion extending in the cylindrical axis direction, and a plurality of support portions 92a (four in this embodiment) are provided at predetermined intervals in the circumferential direction of the second inner cylinder inner frame 92. The opening portion 92b is an opening portion in the second inner cylinder inner frame 92 between the support portions 92a, 92a aligned in the circumferential direction.

[0039] The second inner cylinder filter 94 is for capturing dust contained in the air discharged from the annular space 84 through the second inner cylinder 62A. The second inner cylinder filter 94 is a mesh-like filter having many fine holes. The second inner cylinder filter 94 is curved along the second inner cylinder outer frame 90 and the second inner cylinder inner frame 92, and is sandwiched between the second inner cylinder outer frame 90 and the second inner cylinder inner frame 92. As a result, the second inner cylinder filter 94 becomes a wall part of the second inner cylinder 62A and is capable of capturing dust contained in the air that is about to pass through the opening 90b of the second inner cylinder outer frame 90 and the opening 92b of the second inner cylinder inner frame 92.

[0040] 4 and 6, the one side cylinder portion 64 is provided in a direction away from the bottom side of the outer cylinder 52 (one side in the axial direction) with respect to the above-mentioned second inner cylinder 62A. The one side cylinder portion 64 is provided integrally with or detachably attached to the second inner cylinder 62A, and is provided at a position adjacent to the upper side of the second inner cylinder 62A. As shown in Fig. 6, the one side cylinder portion 64 has an expanded diameter portion 64a, an intermediate portion 64b, and a filter arrangement portion 64c.

[0041] The expanded diameter portion 64a is a portion continuing from the second inner tube 62A side to the upper side. The expanded diameter portion 64a is formed so as to expand in a tapered shape toward the upper side. The intermediate portion 64b is a portion provided at a position adjacent to the expanded diameter portion 64a on the axially upward side. The intermediate portion 64b is formed so as to extend in the axial direction of the outer tube 52. A circumferential groove 64d extending in the circumferential direction is provided on the outer peripheral surface of the one side tube portion 64. The one side tube portion 64 can form a second sealing portion 65 that seals a gap formed between the one side tube portion 64 and the inner peripheral surface of the outer tube 52 by an airtight member (second airtight member 64e) made of an O-ring or the like attached to the circumferential groove 64d. The filter arrangement portion 64c is made to be approximately the same as the inner diameter of the outer tube 52. Therefore, almost no gap is formed between the outer peripheral surface of the filter arrangement portion 64c and the inner peripheral surface of the outer tube 52.

[0042] In addition, the filter arrangement portion 64c has a step portion 64f formed at a portion that forms a boundary with the intermediate portion 64b on the inner circumferential side. A ring-shaped groove portion in which an airtight member 64j is arranged is provided in the step portion 64f, and the step portion 64f abuts against the lower end portion of the second filter 64h to improve airtightness. A first filter 64g and a second filter 64h are arranged inside the filter arrangement portion 64c. The first filter 64g is a filter made of, for example, nonwoven fabric or sponge. The first filter 64g is arranged on the step portion 64f. The second filter 64h has at least a pleated filter and a frame body 64i that surrounds the periphery of the filter. The airtight member 64j abuts against the lower end portion of the frame body 64i. The pleated filter that constitutes the second filter 64h is arranged on the first filter 64g, and the frame body 64i is arranged inside so as to surround the periphery of the first filter 64g. In addition, the second filter 64h has an airtight member 64k disposed on the upper surface of the frame 64i, and the airtight member 64k abuts against the intake side component 42a, thereby improving airtightness. Since the pleated filter of the second filter 64h and the first filter 64g are spaced apart, air is dispersed in the space, and the surface of the pleated filter can be effectively utilized. This solves the problem of the filter becoming clogged early and reducing suction power.

[0043] In this embodiment, the tapered portion 70 is provided on the inner tube 60 of the structure 54, and the end portion (the radially outer end portion) of the tapered portion 70 is formed so as to be continuous with the outer peripheral surface of the one side tube portion 64, but the present invention is not limited to this. For example, as shown in FIG. 11, instead of the tapered portion 70, a tapered portion 70A arranged at a position different from the tapered portion 70 may be provided. That is, the tapered portion 70 is moved to a position away from the one side tube portion 64 toward the other axial side (the outer tube bottom portion 52c side) and is configured to be separated from the one side tube portion 64 in the axial direction. In this configuration, the tapered portion 70A has an umbrella-like shape (an inverted umbrella-shaped shape) that is convex toward the other axial side (the outer tube bottom portion 52c side). In this configuration, dust such as hair and dust can be prevented from getting entangled in the structure 54, as in the vacuum cleaner 1 according to the above embodiment. In addition, even in the case of such a configuration, it is preferable that the dust collection section inlet 52b is formed so as to communicate with the region on the outer cylinder bottom 52c side of the tapered section 70A, and it is more preferable that it is formed at a position closer to the tapered section 70A than the outer cylinder bottom 52c. Note that the first guide section 74, the second guide section 76, and the third guide section 78 do not have to be provided in the tapered section 70A.

[0044] In addition, in this embodiment, the extension portion 72 is separated from the outer tube bottom portion 52c in the axial direction, but the present invention is not limited to this. For example, as shown in Fig. 11, the extension portion 72 may be formed so as to reach the outer tube bottom portion 52c from the tapered portion 70A. In addition, in Fig. 11, an example is shown in which the extension portion 72 is formed so as to reach the outer tube bottom portion 52c in an example of an inverted umbrella type such as the tapered portion 70A, but even in the above embodiment in which the tapered portion 70 and the one side tube portion 64 are provided so as to be continuous (the tapered portion 70 is provided at a position close to the one side tube portion 64), the extension portion 72 may be formed so as to reach the outer tube bottom portion 52c.

[0045] <Effects obtained by the configuration of vacuum cleaner 1> Hereinafter, effects and the like obtained by the configuration of the vacuum cleaner 1 described above will be described.

[0046] (1) The electric vacuum cleaner 1 of this embodiment comprises a vacuum cleaner body 10 having an electric blower 14, and a dust collection section 50 detachable from the vacuum cleaner body 10. The dust collection section 50 has an outer tube 52 having a dust collection section inlet 52b and an opening 52a provided on one axial side, a structure 54 arranged inside the outer tube 52, and a dust collection space 56 formed between the outer tube 52 and the structure 54. The structure 54 is characterized by having a tapered section 70 formed so that its outer shape becomes smaller as it moves from one axial side to the other.

[0047] In the vacuum cleaner 1 of this embodiment, a tapered section 70 whose outer shape becomes smaller from one side in the axial direction to the other side is provided in the structure 54 arranged inside the outer cylinder 52. As a result, the airflow that has flowed into the dust collection space 56 via the dust collection section inlet 52b advances toward the other side in the axial direction (the outer cylinder bottom section 52c side) while swirling within the dust collection space 56 due to the influence of the inclination of the tapered section 70, and dust such as hair and dirt is less likely to become entangled in the structure 54 arranged inside the outer cylinder 52.

[0048] (2) The vacuum cleaner 1 of this embodiment is characterized in that the structure 54 has a first inner tube 60 (inner tube) provided with a tapered portion 70 as a dust collection space exhaust portion 80 for exhausting air from the dust collection space 56, and an extension portion 72 extending from the first inner tube 60 to the other side in the axial direction.

[0049] The vacuum cleaner 1 of this embodiment includes an extension portion 72 extending from the first inner tube 60 to the other side in the axial direction. With this configuration, when an airflow is generated that swirls in the dust collection space 56 and rises toward the tapered portion 70 at the axial center position of the dust collection space 56, the flow of the airflow and dust contained therein is obstructed by the extension portion 72. That is, with the above-mentioned configuration, the airflow and dust that rise from the bottom of the outer tube 52 at the axial center position of the dust collection space 56 are less likely to spread in a direction intersecting the axial direction. As a result, in the vacuum cleaner 1, dust such as hair and dust contained in the airflow are less likely to become entangled in the tapered portion 70.

[0050] In the above embodiment, the extending portion 72 is tubular, but the present invention is not limited to this. The vacuum cleaner 1 may be provided with, for example, a brush or comb teeth extending from the first inner cylinder 60 to the other side in the axial direction as the extending portion 72.

[0051] (3) The electric vacuum cleaner 1 in (2) of this embodiment is characterized in that the outer tube 52 has an outer tube bottom 52c forming a bottom on the other axial side, and the end of the extension portion 72 on the other axial side is spaced apart from the outer tube bottom 52c inside the dust collection space 56.

[0052] In the vacuum cleaner 1 of the present embodiment, by separating the other axial end (the end on the outer cylinder bottom portion 52c side) of the extension portion 72 from the outer cylinder bottom portion 52c, it is possible to prevent the airflow rising from the outer cylinder bottom portion 52c from spreading outward while sufficiently securing the internal volume of the dust collection space 56. In other words, by configuring the vacuum cleaner 1 as described above in (3), dust is likely to collect below the first inner cylinder 60 and inside the extension portion 72.

[0053] (4) In this embodiment, the electric vacuum cleaner 1 according to (2) or (3) above is characterized in that the other axial end of the first inner cylinder 60 is closed.

[0054] The electric vacuum cleaner 1 of this embodiment, with the above-mentioned configuration, can prevent the end of the first inner cylinder 60 on the other axial side from being clogged with dust.

[0055] In this embodiment, an example is shown in which the end portion on the other axial direction side of the first inner cylinder 60 is closed, but the present invention is not limited to this, and the end portion on the other axial direction side of the first inner cylinder 60 may not be closed. When the end portion on the other axial direction side of the first inner cylinder 60 is not closed, it is preferable to configure the part so that it is less likely to become clogged with dust.

[0056] (5) In this embodiment, the electric vacuum cleaner 1 of any of (2) to (4) described above is characterized in that the dust collection section 50 is provided with a first guide portion 74 between the first inner tube 60 and the outer tube 52, which extends from a position upstream in the swirling direction of the airflow toward the dust collection section inlet 52b as it moves from one side to the other side in the axial direction.

[0057] Since the vacuum cleaner 1 of this embodiment includes the first guide portion 74 as described above, the airflow that flows into the dust collection space 56 from the dust collection section inlet 52b is guided by the first guide portion 74 and smoothly guided toward the other axial side (outer cylinder bottom portion 52c). That is, in the vacuum cleaner 1 of this embodiment, the swirling airflow that flows into the dust collection space 56 from the dust collection section inlet 52b and is generated on one axial side (upper side) is made to easily flow toward the other axial side, thereby making it possible to prevent dust such as hair and dirt contained in the airflow from wrapping around the tapered portion 70 of the first inner cylinder 60.

[0058] In the present embodiment, an example in which the first guide portion 74 is provided as described above has been shown, but the present invention is not limited to this, and the first guide portion 74 may not be provided, or another guide member may be provided instead of the first guide portion 74. When the first guide portion 74 is not provided, measures such as optimizing the shape of the dust collection portion inlet 52b so that the inflow direction of the airflow at the dust collection portion inlet 52b faces the other axial direction side (the outer cylinder bottom portion 52c) may be taken. When another guide member is provided instead of the first guide portion 74, it may be configured to guide the airflow that flows from the dust collection portion inlet 52b into the dust collection space 56 to flow smoothly toward the other axial direction side, as with the first guide portion 74, or to guide the airflow to change its direction to the other axial direction side before the airflow that flows from the dust collection portion inlet 52b makes one revolution in the circumferential direction of the dust collection space 56.

[0059] (6) In this embodiment, the electric vacuum cleaner 1 of any of (2) to (5) described above is characterized in that the dust collecting section 50 has a second guide portion 76 that guides the air flow flowing from the dust collecting section inlet 52b into the dust collecting space 56, and the second guide portion 76 is disposed between the first inner tube 60 and the outer tube 52 so as to extend in a direction intersecting the axial direction.

[0060] Since the electric vacuum cleaner 1 of the present embodiment includes the second guide portion 76 as described above, it is possible to smoothly introduce and swirl the airflow from the dust-collecting-portion inlet 52b into the dust-collecting space 56.

[0061] In this embodiment, a configuration in which the above-mentioned second guide portion 76 is provided has been exemplified, but the present invention is not limited to this, and a configuration in which the second guide portion 76 is not provided, or a configuration which performs the same function as the second guide portion 76, may be provided.

[0062] (7) In this embodiment, in any one of the above-mentioned vacuum cleaners (2) to (6), the structure 54 can include a side tube portion 64 arranged on one side in the axial direction, and the first inner tube 60 can be connected to the side tube portion 64.

[0063] In the electric vacuum cleaner 1 of this embodiment, the inner cylinder 60 and the one side cylinder portion 64 are connected as described above, so that the first inner cylinder 60 can be held firmly.

[0064] (8) In this embodiment, the electric vacuum cleaner 1 of any of (2) to (6) described above is characterized in that the structure 54 includes a side tube portion 64 arranged on one side in the axial direction, has an airflow outlet portion 67 for discharging air to the outside of the dust collection space 56, has a connecting body 62 arranged to extend in the axial direction inside the first inner tube 60, and the first inner tube 60 and the connecting body 62 are connected to each other.

[0065] Since the vacuum cleaner 1 of this embodiment has the above-mentioned configuration, the first inner cylinder 60 can be firmly held by the connector 62. Note that, in this embodiment, an example of the connector 62 having the above-mentioned configuration has been shown, but the present invention is not limited thereto, and for example, the second inner cylinder 62A and the first inner cylinder 60 may be connected.

[0066] (9) In this embodiment, the electric vacuum cleaner 1 of any of (1) to (8) described above is characterized in that the dust collection section 50 has a sealing portion (first sealing portion 73, second sealing portion 65) that seals between the structure 54 and the outer tube 52 on one axial side of the dust collection section inlet 52b.

[0067] In the vacuum cleaner 1 of this embodiment, as described above, the gap between the structure 54 and the outer cylinder 52 is sealed at a sealing portion provided on one side of the dust collection portion inlet 52b in the axial direction, and therefore the dust collection space 56 is highly airtight. Therefore, the vacuum cleaner 1 is less likely to suffer from a decrease in dust collection performance due to air leaking from the gap between the structure 54 and the outer cylinder 52. In addition, airflow from the dust collection space 56 to the outside through the gap between the structure 54 and the outer cylinder 52 is less likely to occur. Therefore, it is possible to suppress dust from being attracted to the gap by such airflow.

[0068] In this embodiment, the first sealing portion 73 is provided, but the present invention is not limited to this. For example, the vacuum cleaner 1 of this embodiment may be configured to perform sealing only by the second sealing portion 65 without providing the first sealing portion 73.

[0069] (10) In this embodiment, the electric vacuum cleaner 1 of (1) described above is characterized in that the structure 54 includes a second inner tube 62A (inner tube) having an airflow outlet portion 67 for exhausting air from the dust collection space 56, a tapered portion 70A is formed between the second inner tube 62A and the outer tube 52 so as to extend in a direction intersecting the axial direction, and a dust collection section inlet 52b is arranged on the other axial side of the tapered portion 70A.

[0070] Since the electric vacuum cleaner 1 of this embodiment is configured as described above, it is possible to introduce an airflow containing dust from the dust-collecting section inlet 52b into the dust-collecting space 56 located on the other axial side (the outer cylinder bottom section 52c side) of the tapered section 70A, and separate the air and the dust. Furthermore, since the electric vacuum cleaner 1 of this embodiment is configured as described above, the airflow that passes through the tapered section 70A and rises to one axial side after being separated into air and dust in the dust-collecting space 56 can be discharged from the airflow outlet section 67 to the outside of the dust-collecting section 50. Therefore, according to the electric vacuum cleaner 1 of this embodiment, dust such as hair and dust is less likely to become entangled in the structure 54.

[0071] (11) In this embodiment, the electric vacuum cleaner 1 of (1) described above is characterized in that the tapered portion 70A is formed to extend between the second inner tube 62A and the outer tube 52 in a direction intersecting the axial direction, and air flows in from the dust collection section inlet 52b between the tapered portion 70A and the outer tube bottom 52c of the outer tube 52.

[0072] Since the vacuum cleaner 1 of the present embodiment is configured as described above, it is possible to introduce an airflow containing dust from the dust-collecting part inlet 52b into the dust-collecting space 56 between the tapered part 70A and the outer cylinder bottom part 52c of the outer cylinder 52, and separate the dust from the air. Therefore, according to the vacuum cleaner 1 of the present embodiment, dust such as hair and dust is less likely to become entangled in the structure 54.

[0073] (12) In this embodiment, the electric vacuum cleaner 1 of (10) or (11) described above is characterized in that the dust collection section inlet 52b is located between the outer tube bottom 52c of the outer tube 52 and the tapered section 70A in the axial direction, and is located closer to the tapered section 70A than the outer tube bottom 52c.

[0074] As described above, the vacuum cleaner 1 of this embodiment can introduce airflow from the dust-collecting-part inlet 52b into the dust-collecting space 56 at a position closer to the tapered part 70A than the outer cylinder bottom part 52c in the axial direction. This allows dust contained in the airflow swirling inside the dust-collecting space 56 to be smoothly guided to the other side in the axial direction by the tapered part 70A, thereby preventing the dust from becoming entangled with the structure 54.

[0075] (13) In the present embodiment, the electric vacuum cleaner 1 according to any one of (1) to (12) above is characterized in that the tapered portion 70 is provided with a mesh member 82 having air holes 70e.

[0076] The electric vacuum cleaner 1 of this embodiment, having the above-mentioned configuration, can capture dust contained in the airflow coming out of the dust collection space 56 accurately.

[0077] (14) In this embodiment, the electric vacuum cleaner 1 of (13) above is characterized in that the mesh member 82 is made of a resin material, a metal material, or a combination of these.

[0078] As described above, the vacuum cleaner 1 of the present embodiment is provided with the mesh member 82 made of a resin material, a metal material, or a combination of these, so that the mesh member 82 can capture dust accurately. Furthermore, if the mesh member 82 is made of a metal material, dust is less likely to adhere to the mesh member 82.

[0079] In this embodiment, an example is shown in which mesh member 82 made of the material described above is provided, but the present invention is not limited to this, and mesh member 82 made of other materials that are effective against the adhesion of dust may also be used.

[0080] (15) In this embodiment, the electric vacuum cleaner 1 of (8) described above is characterized in that the airflow outlet section 67 is formed in a wall section (first inner tube 60) made of a metal material, a resin material or a combination thereof, with a plurality of holes formed therein.

[0081] The vacuum cleaner 1 of the present embodiment, having the above-mentioned configuration, can capture dust contained in the airflow passing through the airflow outlet portion 67. In addition, by reducing the roughness of the surface of the wall portion, adhesion of dust can be suppressed.

[0082] (16) The vacuum cleaner 1 of this embodiment is characterized in that the first guide portion 74 and the second guide portion 76 are connected to each other.

[0083] Since the electric vacuum cleaner 1 of the present embodiment is configured as described above, dust does not get into the boundary between the first guide portion 74 and the second guide portion .

[0084] (17) The vacuum cleaner 1 of this embodiment is characterized in that the second guide portion 76 extends along the turning direction.

[0085] The electric vacuum cleaner 1 of the present embodiment is configured as described above, so that the airflow flowing into the dust collection space 56 along the second guide portion 76 can be caused to smoothly swirl.

[0086] (18) The vacuum cleaner 1 of this embodiment is characterized in that the first guide portion 74 extends toward the dust-collection portion inlet 52b.

[0087] Since the vacuum cleaner 1 of the present embodiment is configured as described above, the airflow that flows from the dust collection section inlet 52b into the dust collection space 56 and then attempts to reach the dust collection section inlet 52b can be guided toward the outer cylinder bottom 52c side. This prevents the airflow that flows in from the dust collection section inlet 52b from swirling without moving toward the outer cylinder bottom 52c side beyond the position of the dust collection section inlet 52b, and prevents dust such as hair and dirt from becoming entangled in the vicinity of the dust collection section inlet 52b.

[0088] (19) In this embodiment, the electric vacuum cleaner 1 described above in (2) to (8) is characterized in that an internal space 84 is provided inside the first inner tube 60, into which airflow can flow from the outside of the first inner tube 60, and a third guide portion 78 formed to extend from the inner circumferential surface of the first inner tube 60 is disposed in the internal space 84.

[0089] In the vacuum cleaner 1 of this embodiment, the airflow that has flowed into the internal space 84 from the first inner cylinder 60 is guided by the third guide portion 78, and is expected to form a swirling flow inside the internal space 84. This allows dust contained in the airflow that has flowed into the internal space 84 to be separated from the air and collected, and the purified air can be discharged from the inner cylinder 60 to the outside.

[0090] In this embodiment, an example in which the third guide portion 78 is provided is shown, but the present invention is not limited to this, and a configuration may be used in which the third guide portion 78 is not provided, or another configuration may be provided in place of the third guide portion 78, thereby generating a swirling flow in the internal space 84.

[0091] (20) The vacuum cleaner 1 of this embodiment may be characterized in that it has at least one of a first airtight member 70d for sealing between the first inner tube 60 and the outer tube 52, and a second airtight member 64e for sealing between the one side tube portion 64 and the outer tube 52.

[0092] With this configuration, the vacuum cleaner 1 can prevent air and dust from leaking from the gap between the first inner cylinder 60 and the outer cylinder 52. Note that, although the present embodiment has been exemplified by providing both the first airtight member 70d and the second airtight member 64e to improve the airtightness between the first inner cylinder 60 and the outer cylinder 52, the same effect as that of the vacuum cleaner 1 of the above embodiment can be expected as long as at least one of the airtight members is provided.

[0093] (21) As shown in FIG. 10, in the vacuum cleaner 1 of this embodiment, when four virtual regions X1 to X4 are assumed to be classified by a first virtual plane A and a second virtual plane B which include an axis passing through the axial center position of the dust collecting unit 50 and are perpendicular to each other, the dust collecting unit inlet 52b communicates with the interior of the dust collecting unit 50 in virtual region X1, which is one of the four virtual regions, and is located at a position biased toward one side of two virtual regions X2 and X3 adjacent to the virtual region X1 (virtual region X2 in the illustrated example).

[0094] The electric vacuum cleaner 1 of the present embodiment is configured in this way, which reduces the possibility that the airflow flowing in from the dust-collecting section inlet 52b will collide with the outer circumferential surface of the first inner cylinder 60 or the inner circumferential surface of the outer cylinder 52 and be attenuated. As a result, the electric vacuum cleaner 1 can cause the airflow flowing through the dust-collecting section inlet 52b to flow smoothly and with almost no loss of momentum into the dust-collecting space 56 and swirl, thereby improving the efficiency of separating dust from air.

[0095] (22) The vacuum cleaner 1 of this embodiment is characterized in that the dust collection section inlet 52b is formed so as to be able to introduce an airflow in the tangential direction of at least one of the outer circumferential surface of the first inner tube 60 and the inner circumferential surface of the outer tube 52.

[0096] Since the vacuum cleaner 1 of the present embodiment is configured as described above, most of the airflow flowing in from the dust-collecting section inlet 52b can be made to flow along the outer circumferential surface of the first inner cylinder 60 and the inner circumferential surface of the outer cylinder 52. This reduces the possibility that the airflow flowing in from the dust-collecting section inlet 52b will collide with the outer circumferential surface of the first inner cylinder 60 and the inner circumferential surface of the outer cylinder 52 and be attenuated, and allows the airflow to flow smoothly and powerfully into the dust-collecting space 56 and swirl. Therefore, the above-described configuration can increase the efficiency of separating dust and air.

[0097] (23) In order to solve the problem of the prior art as in Patent Document 1 that dust such as hair and dirt tends to get entangled in the dust collection container, the electric vacuum cleaner 1 of this embodiment comprises a vacuum cleaner body 10 having an electric blower 14, and a dust collection section 50 that is detachable from the vacuum cleaner body 10. The dust collection section 50 is characterized by having an outer tube 52 having a dust collection section inlet 52b and an opening 52a provided on one side in the axial direction, a structure 54 disposed inside the outer tube 52, a dust collection space 56 formed between the outer tube 52 and the structure 54, and a first guide section 74 that extends between the structure 54 and the outer tube 52 from a position upstream in the swirling direction of the airflow toward the dust collection section inlet 52b as it moves from one side to the other side in the axial direction.

[0098] Since the vacuum cleaner 1 of this embodiment includes the first guide portion 74 as described above, the airflow that flows from the dust-collecting section inlet 52b into the dust-collecting space 56 is guided by the first guide portion 74 and smoothly guided toward the other axial side (outer cylinder bottom portion 52c). That is, in the vacuum cleaner 1 of this embodiment, the swirling airflow that flows from the dust-collecting section inlet 52b into the dust-collecting space 56 and is generated on one axial side (upper side) can be easily directed toward the other axial side. This makes it possible to prevent dust such as hair and dirt contained in the airflow from wrapping around the structure 54. Therefore, it is possible to provide a vacuum cleaner that can prevent dust such as hair and dirt from wrapping around the dust collecting device.

[0099] The present invention is not limited to the above-described embodiments and modifications, and other embodiments may be possible within the scope of the claims. The components of the above-described embodiments may be arbitrarily selected and combined. Any component of the embodiment may be arbitrarily combined with any component described in the Summary of the Invention or any component that embodies any component described in the Summary of the Invention. The present invention also intends to obtain rights to these by amending this application or filing a divisional application. [Industrial Applicability]

[0100] The present invention can be suitably used in all types of electric vacuum cleaners, such as upright types, canister types, and robot vacuum cleaners. [Explanation of symbols]

[0101] 1: Vacuum cleaner 10: Vacuum cleaner body 14:Electric blower 50: Dust collection section 52: Outer cylinder 52a: Opening 52b: Dust collection section inlet 52c: Bottom of outer cylinder 54 :Structure 56: Dust collection space 60:First inner cylinder 62:Second inner cylinder 64: One side cylinder part 64e: Second airtight member 65:Second sealing part 67: Airflow outlet 70: Tapered section 70d: First airtight member 70e: Ventilation hole 72: Extension part 73:First sealing part 74: First guide part 76: Second guide part 78: Third guide part 80: Dust collection space exhaust section 82: Mesh material 84: Annular space 94: Second inner cylinder filter A: First virtual surface B: Second virtual surface X1: Virtual area X2: Virtual area X3: Virtual Region X4 :Virtual area

Claims

1. A vacuum cleaner body having an electric blower; A dust collecting device that is detachable from the vacuum cleaner body, The dust collecting device includes: an outer cylinder having an inlet and an opening provided on one side in the axial direction; A structure disposed inside the outer cylinder; A dust collection space is formed between the outer cylinder and the structure, The structure comprises: a tapered portion formed so that an outer shape becomes smaller from one side toward the other side in the axial direction; a first inner cylinder including the tapered portion as a dust collection space exhaust portion for exhausting air from the dust collection space, The first inner cylinder has an internal space into which airflow can flow from the outside of the first inner cylinder, a third guide portion is disposed in the internal space and extends from an inner peripheral surface of the first inner cylinder,

2. The electric vacuum cleaner according to claim 1 , wherein the third guide portion is provided in a plurality of parts in the internal space at predetermined intervals in the circumferential direction.

3. 3. The electric vacuum cleaner according to claim 1, wherein a tip end of the third guide portion extends away from a base end of the third guide portion in the same direction as the rotating direction.

4. 4. The vacuum cleaner according to claim 1, wherein the tapered portion is a wall portion formed by resin molding, the wall portion having a plurality of holes as the dust collection space exhaust portion.

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