Vacuum cleaner

Abstract

To provide a vacuum cleaner capable of suppressing the winding of dust such as hair and dust in a dust collector.SOLUTION: A vacuum cleaner includes a cleaner body having an electric blower, and a dust collection part 50 attachable to and detachable from the cleaner body. The dust collection part 50 has an outer cylinder 52 having a dust collection part inflow port 52b and an opening part 52a provided on one side in the axial direction, a structural body 54 arranged inside the outer cylinder 52, and a dust collection space 56 formed between the outer cylinder 52 and the structural body 54. The structural body 54 includes the tapered portion 70 formed such that the outer shape becomes smaller from the one side toward the other side in the axial direction, and the second inner cylinder side 62A having the airflow outflow portion 67 for exhausting air from the dust collection space 56, and the tapered portion 70 is formed so as to extend in a direction intersecting the axial direction between the second inner cylinder side 62A and the outer cylinder 52, and has an umbrella shape that is convex toward the other side in the axial direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] A conventional vacuum cleaner is disclosed in Patent Document 1 below. This vacuum cleaner has an inner tube formed with an exhaust port for exhausting air from the center of the dust collection container after air is sucked in through an air inlet provided circumferentially around the periphery of the dust collection container, and collects dust contained in the air at the bottom of the dust collection container. Furthermore, the inner tube of the dust collection container provided in this vacuum cleaner has an outer peripheral wall that is partially configured as an inner tube filter that filters the air passing through. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-26686 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the case of the conventional technology such as that of Patent Document 1, there is a problem in that the swirling airflow formed around the inner cylindrical filter makes it easy for dust such as hair and dirt to become entangled inside the dust collection container. When such dust becomes entangled inside 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 INVENTION It is therefore an object of the present invention to provide a vacuum cleaner that can prevent dust such as hair and dirt from becoming entangled in the dust collecting device. [Means for solving the problem]

[0006] The electric vacuum cleaner of the present invention, which is provided to solve the above-mentioned problems, comprises a vacuum cleaner body having an electric blower, and a dust collecting device that can be attached to and detached from the vacuum cleaner body, wherein the dust collecting device has an outer tube having an inlet and an opening 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 its outer shape becomes smaller from one side in the axial direction to the other side, and an inner tube having an airflow outlet portion for exhausting air from the dust collecting space, and the tapered portion is formed so as to extend between the inner tube and the outer tube in a direction intersecting the axial direction, and is umbrella-shaped so as to be convex toward the other side in the axial direction.

[0007] In the vacuum cleaner of the present invention, a structure disposed inside the outer cylinder is provided with a tapered portion whose outer diameter decreases from one side in the axial direction to the other side. As a result, the airflow flowing into the dust collection space through the inlet swirls within the dust collection space due to the influence of the tapered portion and advances toward the other side in the axial direction, making it difficult for hair, dust, and other debris 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 debris from becoming entangled in the dust collection device. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a vacuum cleaner that can prevent dust such as hair and dirt from getting entangled in the dust collecting device. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an electric vacuum cleaner according to an embodiment of the present invention; [Figure 2] 2 is a perspective view showing a vacuum cleaner body provided in the electric vacuum cleaner of FIG. 1. FIG. [Figure 3] FIG. 3 is a cross-sectional view of a main part of the 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. FIG. [Figure 5]FIG. 5 is a perspective view showing the dust collecting unit 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. FIG. [Figure 9] 5 is an exploded perspective view showing a second inner cylinder included in the dust collecting unit of FIG. 4. FIG. [Figure 10] 5 is a cross-sectional view taken along the line AA in FIG. 4. [Figure 11] FIG. 10 is a cross-sectional view showing a dust collecting section according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[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, followed by a more detailed description of the main parts. In the following description, unless otherwise specified, 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 set upright as shown in FIG.

[0011] <<Overall configuration of vacuum cleaner 1>> As shown in Fig. 1, the electric vacuum cleaner 1 is a vacuum cleaner with a stick-shaped (vertical) appearance. The electric 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 electric vacuum cleaner 1 includes a vacuum cleaner main 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 forms 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 such that an electric blower 14 for sucking air and generating an airflow, a battery 18, a circuit board 20, and other components are incorporated inside a main body case 12 that forms the housing.

[0013] The vacuum cleaner body 10 has 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 forms an air passage 38b that communicates 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 that is 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 section that collects dust sucked by vacuum cleaner 1. 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 its specific structure will be described in detail later.

[0016] 1, the pipe 110 is a cylindrical member that detachably connects the vacuum cleaner body 10 and the suction port body 100. One end of the pipe 110 is shaped so that it can be inserted into the 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 pipe 110, a continuous communication 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 portion 110. The suction port body 100 has a suction port 103 and a joint portion 104. The suction port 103 opens toward the bottom. The joint portion 104 can be connected to the suction port 38y or the pipe portion 110.

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

[0019] The electric vacuum cleaner 1 is generally configured as described above. The electric vacuum cleaner 1 has distinctive structures in each part, such as the dust collection 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 collection unit 50> The dust collection unit 50 will be described in detail below with reference to Figs. 4 to 10. The dust collection unit 50 is detachably attached to the vacuum cleaner body 10. The dust collection unit 50 is a so-called cyclone-type dust collection device. That is, the dust collection unit 50 is capable of collecting dust in the process of introducing air through a dust collection unit inlet 52b provided in the outer cylinder 52, forming a swirling airflow inside the outer cylinder 52, and then discharging the air. The dust collection unit 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 cylindrical body 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 (the upper side in the illustrated example) and an outer cylinder bottom 52c on the other axial side (the lower side in the illustrated example). The outer cylinder bottom 52c may have an openable lid for disposing of dust accumulated in the outer cylinder 52. The outer cylinder 52 also has a dust collection inlet 52b (inlet) on its periphery.

[0023] The dust collection unit inlet 52b is an inlet for receiving air that is drawn into the air passage 38b through the suction port 38y and discharged through the air passage discharge port 38x. The dust collection unit inlet 52b is located at a position corresponding to the air passage discharge port 38x, for example, at the middle of the outer cylinder 52 in the axial direction (vertical direction). Therefore, by attaching the dust collection unit 50 to the vacuum cleaner body 10, the dust collection unit inlet 52b and the air passage discharge port 38x can be connected to each other. Furthermore, the dust collection unit inlet 52b can introduce the air discharged from the air passage discharge port 38x into the dust collection space 56 in a tangential direction to the inner circumferential surface of the outer cylinder 52. Therefore, the air introduced into the dust collection space 56 through the dust collection unit inlet 52b forms a swirling flow that flows along the inner circumferential surface of the outer cylinder 52.

[0024] As shown in FIGS. 4 and 6 , the structural body 54 is a component disposed inside the outer cylinder 52. The structural body 54 is a component that defines a dust collection space 56 into which air flows between the structural body 54 and the outer cylinder 52. The structural body 54 is disposed so that its axial center position is approximately aligned with that of the outer cylinder 52. The structural body 54 has a portion (a tapered portion 70, described below) formed so that its outer shape becomes smaller from one side (the upper side in the drawing) to the other side (the lower side in the drawing) in the axial direction. The structural body 54 has a first inner cylinder 60 (inner cylinder) and one side cylinder portion 64, and further has a connector 62, although this is not an essential component. The first inner cylinder 60 is connected to the one side cylinder portion 64. If the connector 62 is provided, the first inner cylinder 60 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 cylinder 60 has a tapered portion 70, and preferably an extending portion 72. The first inner cylinder 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 component.

[0026] The tapered portion 70 is a portion formed so that its outer shape becomes smaller from one side in the axial direction (the upper side in the drawing) to the other side (the lower side in the drawing). The tapered portion 70 is formed in a truncated cone shape, and is formed so that the outer circumferential surface slopes linearly toward the axial center as it moves from one side in the axial direction to the other side. The tapered portion 70 is open toward one side in the axial direction (the upper side), but includes a closed portion 70a that is closed on the other side in the axial direction (the 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 axial side is approximately equal to the inner diameter of the outer tube 52. 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 forms a first sealing portion 73 that seals a gap formed between the tapered portion 70 and the inner peripheral surface of the outer tube 52 using an airtight member (first airtight member 70d) such as an O-ring attached to the circumferential groove 70c. That is, by placing the tapered portion 70 inside the outer tube 52 with the closing portion 70a facing the bottom portion 52c of the outer tube, the first sealing portion 73 is formed, in which the first airtight member 70d attached to the circumferential groove 70c is in close contact with the inner peripheral surface of the outer tube 52. 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 side of the first sealing portion 73 (the bottom portion 52c side of the outer tube 52). The first sealing portion 73 is formed above the dust collection portion inlet 52b that communicates with the dust collection space 56.

[0028] In addition to forming the dust collection space 56 as described above, the tapered portion 70 also functions as a 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 to communicate the inside and outside of the tapered portion 70. The tapered portion 70 may be formed by resin molding or by a mesh member 82. The mesh member 82 is a mesh-like member made of a resin material, a metal material, or a combination thereof. Therefore, dust contained in air passing through the vent holes 70e that form the dust collection space exhaust portion 80 can be captured by the mesh member 82. A resin molded tapered portion 70 has a smoother surface than a mesh member 82, which reduces dust trapping.

[0029] The extending portion 72 is a portion formed to extend further toward the other axial direction from the tapered portion 70. In this embodiment, the extending portion 72 extends toward the other axial direction from the end portion on the other axial direction (the lower end portion in the illustrated example) as a base end. The extending portion 72 is formed to be spaced apart from the outer cylinder bottom portion 52c toward one axial direction side (the upper side in the illustrated example) inside the dust collection space 56. The extending portion 72 is formed to surround the periphery of the closing portion 70a. As a result, the extending portion 72 has a cylindrical shape whose upper end is closed by the closing portion 70a and whose lower end is open. Because the extending portion 72 is provided to surround the periphery of the closing portion 70a, airflows and dust that rise from the bottom of the outer cylinder 52 at a position on the axial center side of the dust collection space 56 collide with the closing 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. Preferably, the extension portion 72 is a cylindrical shape having the same outer dimensions from the upper end to the lower end, or a tapered cylindrical shape whose outer dimensions become smaller from the upper end to the lower end. This prevents 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 plurality of extension members extending in the axial direction and spaced apart from one another.

[0030] Furthermore, the closing portion 70a may have a convex shape on the center side toward the bottom of the outer cylinder 52, 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 a position on the axial side of the dust collection space 56 to move toward the extending portion 72 by the closing portion 70a.

[0031] Furthermore, the outer tube bottom 52c integrally formed as the bottom of the outer tube 52, or the lid-shaped outer tube bottom 52c that is rotatably 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 (protrusions) 52d as restricting ribs that restrict the movement of dust due to the swirling airflow. The plurality of ribs 52d extend toward the structure 54 and are arranged at intervals in the circumferential direction. Furthermore, as described above, the outer tube bottom 52c integrally formed as the bottom of the outer tube 52 or the lid-shaped outer tube bottom 52c that is able to open and close the bottom of the outer tube 52 may be provided with protrusions extending toward the structure 54 (blocking portion 70a) instead of or in addition to the plurality of ribs 52d. When protrusions are provided together with the plurality of ribs 52d, the plurality of ribs 52d are arranged at intervals around the protrusions in a direction intersecting the axis (in the radial direction in this embodiment). The protruding portion is preferably columnar, for example, cylindrical, rectangular, or cross-shaped, or tapered toward the structure 54. This prevents dust that collects below the blocking portion 70a from being moved by airflow. 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 tangled in the protruding portion or rib 52d.

[0032] As shown in FIGS. 7 and 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 circumferential surface of the outer tube 52. The first guide portion 74 is disposed between the outer tube 52 and the first inner tube 60 when 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 52c. The first guide portion 74 functions as a guide member for guiding the airflow that flows from the dust collection section inlet 52b into the dust collection space 56 and swirls along the inner periphery of the outer tube 52 toward the other axial side (the outer tube bottom 52c side). The first guide portion 74 extends from one axial side to the other axial side (from the upper side to the lower side in the illustrated example) so as to approach the dust collection section inlet 52b. An end of the first guide portion 74 may reach the dust collection section inlet 52b. In other words, the first guide portion 74 extends from one side to the other 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 of the dust collection portion inlet 52b in the swirling direction of the airflow. Note that, although the first guide portion 74 has been described as being provided on the structure 54, it may also be provided on the inner peripheral surface of the outer cylinder 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] Similar to the first guide portion 74, the second guide portion 76 is a rib-like portion provided on the outer periphery of the tapered portion 70. The second guide portion 76 is a rib that functions as a guide member for guiding the airflow flowing from the dust collection portion inlet 52b into the dust collection 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 rib-shaped and provided on the inner circumferential side of the first inner tube 60. The third guide portion 78 is disposed inside an 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 to extend from one circumferential side to the other circumferential side of the internal space 84. In this embodiment, when the structure 54 is cut along a plane perpendicular to the axial direction and viewed from one axial side (top side), the third guide portion 78 is formed so that its tip end (free end) is located at a position spaced apart in the clockwise direction (the same direction as the rotation direction) from its base end (the connection portion with the inner circumferential surface of the tapered portion 70). 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 air that has flowed into the dust collection space 56 to the outside of the dust collection unit 50. Although not a required component, the airflow outlet 67 may include a filter. The connector 62 may be detachably connected to the first inner tube 60. In this case, the other axial end of the connector 62 is connected to the inside of the first inner tube 60. As shown in FIG. 4 and other figures, the connector 62 is formed, for example, by a cylindrical frame. Hereinafter, the connector 62 will be described as a second inner tube 62A as an example. The second inner tube 62A is disposed inside the first inner tube 60 (on the axial side of the dust collection unit 50). The second inner tube 62A is connected to both or either of the first inner tube 60 and the one-side tube portion 64. In this embodiment, the second inner tube 62A is connected to the first inner tube 60. As a result, an internal space 84 is formed between the first inner tube 60 and the second inner tube 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 support posts 90a and openings 90b in the middle in the axial direction of the cylinder. The support posts 90a are columnar portions extending in the axial direction of the cylinder, and multiple support posts 90a (four in this embodiment) are provided at predetermined intervals around the circumference of the second inner cylinder outer frame 90. The openings 90b are open portions of the second inner cylinder outer frame 90 between the support posts 90a, 90a that are lined up 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 support posts 92a and openings 92b in the middle in the cylindrical axis direction. The support posts 92a are columnar portions extending in the cylindrical axis direction, and multiple support posts 92a (four in this embodiment) are provided at predetermined intervals around the circumference of the second inner cylinder inner frame 92. The openings 92b are openings in the second inner cylinder inner frame 92 between the support posts 92a, 92a that are lined up 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 via the second inner cylinder 62A. The second inner cylinder filter 94 is a mesh-like filter with many fine holes formed therein. 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 forms a wall portion of the second inner cylinder 62A and is capable of capturing dust contained in the air that is passing 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 (one axial side) away from the bottom side of the outer cylinder 52 with respect to the 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 mounting portion 64c.

[0041] The expanded diameter portion 64a is a portion that continues upward from the second inner tube 62A side. The expanded diameter portion 64a is formed so as to expand in a tapered manner as it extends upward. The intermediate portion 64b is a portion that is provided at a position adjacent to the expanded diameter portion 64a on the axially upper 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 inner peripheral surface of the outer tube 52 and the filter mounting portion 64c by an airtight member (second airtight member 64e) such as an O-ring attached to the circumferential groove 64d. The filter mounting portion 64c has approximately the same inner diameter as the outer tube 52. Therefore, there is almost no gap between the outer peripheral surface of the filter mounting portion 64c and the inner peripheral surface of the outer tube 52.

[0042] The filter mounting portion 64c has a step 64f formed at the boundary between the filter mounting portion 64c and the intermediate portion 64b on the inner circumferential side. A ring-shaped groove in which an airtight member 64j is disposed is provided in the step 64f, and the airtight member 64j abuts against the lower end of the second filter 64h, thereby improving airtightness. A first filter 64g and a second filter 64h are disposed inside the filter mounting portion 64c. The first filter 64g is a filter made of, for example, nonwoven fabric or sponge. The first filter 64g is disposed on the step 64f. The second filter 64h includes at least a pleated filter and a frame 64i surrounding the filter. The airtight member 64j abuts against the lower end of the frame 64i. The pleated filter constituting the second filter 64h is disposed on top of the first filter 64g, and the frame 64i is disposed inside the first filter 64g so as to surround the first filter 64g. 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, improving airtightness. The pleated filter of the second filter 64h and the first filter 64g are spaced apart, allowing air to disperse in the space, effectively utilizing the surface of the pleated filter. This solves the problem of premature filter clogging and reduced suction power.

[0043] In the present embodiment, the tapered portion 70 is provided on the inner tube 60 of the structure 54, and the terminal end (the radially outer end) of the tapered portion 70 is formed so as to be continuous with the outer peripheral surface of the one side tube portion 64. However, 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 may be provided at a position different from the tapered portion 70. That is, the tapered portion 70 may be moved to a position away from the one side tube portion 64 toward the other axial side (toward the outer tube bottom portion 52c) and separated from the one side tube portion 64 in the axial direction. With this configuration, the tapered portion 70A has an umbrella-like shape (an inverted umbrella shape) that is convex toward the other axial side (toward the outer tube bottom portion 52c). With this configuration, as with the vacuum cleaner 1 according to the above embodiment, it is possible to prevent dust, such as hair and dirt, from becoming entangled in the structure 54. Even in such a configuration, dust collection section inlet 52b is preferably formed to communicate with tapered section 70A in a region closer to outer cylinder bottom section 52c, and more preferably formed at a position closer to tapered section 70A than outer cylinder bottom section 52c. Tapered section 70A does not necessarily need to be provided with first guide section 74, second guide section 76, or third guide section 78.

[0044] Furthermore, in this embodiment, the extending portion 72 is spaced apart 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 extending portion 72 may be formed so as to extend from the tapered portion 70A to the outer tube bottom portion 52c. Furthermore, Fig. 11 shows an example in which the extending portion 72 is formed so as to extend from the tapered portion 70A to the outer tube bottom portion 52c in an example having an inverted umbrella shape such as the tapered portion 70A. However, even in an example in which the tapered portion 70 and the one side tube portion 64 are continuous (i.e., the tapered portion 70 is positioned closer to the one side tube portion 64) as in the above embodiment, the extending portion 72 may be formed so as to extend to the outer tube bottom portion 52c.

[0045] <<Effects obtained by the configuration of electric vacuum cleaner 1>> The following describes the effects and the like obtained by the configuration of the vacuum cleaner 1 described above.

[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 unit 50 that can be attached to and detached from the vacuum cleaner body 10. The dust collection unit 50 has an outer tube 52 having a dust collection unit inlet 52b and an opening 52a provided on one side in the axial direction, 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 portion 70 formed so that its outer shape becomes smaller as it moves from one side in the axial direction to the other side.

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

[0048] (2) The electric 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 cylinder 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 a position on the axial side 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-described configuration, the airflow and dust that rise from the bottom of the outer cylinder 52 at a position on the axial side 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 dirt 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 electric 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 portion 52c that forms the bottom on the other side in the axial direction, and the end portion on the other side in the axial direction of the extension portion 72 is spaced apart from the outer tube bottom portion 52c inside the dust collection space 56.

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

[0053] (4) In the present embodiment, the electric vacuum cleaner 1 of (2) or (3) described 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-described configuration, can prevent the other axial end of the first inner cylinder 60 from being clogged with dust.

[0055] In this embodiment, an example has been shown in which the end portion on the other axial 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 side of the first inner cylinder 60 may not be closed. In addition, when the end portion on the other axial side of the first inner cylinder 60 is not closed, it is preferable to configure this portion 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 section 74 that extends between the first inner tube 60 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 in the axial direction.

[0057] Because the vacuum cleaner 1 of this embodiment is provided with 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 directed toward the other axial side (outer cylinder bottom portion 52c). In other words, 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 more easily flow toward the other axial side, thereby preventing dust such as hair and dirt contained in the airflow from getting wrapped around the tapered portion 70 of the first inner cylinder 60.

[0058] While the present embodiment has been described with reference to an example in which the first guide portion 74 is provided, the present invention is not limited thereto. The first guide portion 74 may not be provided, or another guide member may be provided in place of the first guide portion 74. When the first guide portion 74 is not provided, measures may be taken, such as optimizing the shape of the dust collection inlet 52b so that the airflow entering the dust collection inlet 52b faces the other axial side (the outer cylinder bottom portion 52c). When another guide member is provided in place of the first guide portion 74, the other guide member may guide the airflow flowing from the dust collection inlet 52b into the dust collection space 56 smoothly toward the other axial side, as with the first guide portion 74, or may guide the airflow flowing from the dust collection inlet 52b so that the direction of the airflow changes to the other axial side before it makes one revolution around the circumferential surface of the dust collection space 56.

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

[0060] The electric vacuum cleaner 1 of this embodiment is provided with the second guide portion 76 as described above, and therefore can 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 is 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 that performs the same function as the second guide portion 76 may be provided.

[0062] (7) In this embodiment, the electric vacuum cleaner 1 of any of (2) to (6) described above can be configured such that the structure 54 includes one side tube portion 64 arranged on one side in the axial direction, and the first inner tube 60 is connected to the one 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.

[0065] The vacuum cleaner 1 of this embodiment has the above-described configuration, and therefore the first inner cylinder 60 can be firmly held by the connector 62. Note that, although the present embodiment has shown an example of the connector 62 having the above-described configuration, the present invention is not limited to this, 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 section (first sealing section 73, second sealing section 65) that seals between the structure 54 and the outer tube 52 on one axial side of the dust collection section inlet 52b.

[0067] As described above, in the vacuum cleaner 1 of this embodiment, 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 experience a decrease in dust collection performance due to air leaking from the gap between the structure 54 and the outer cylinder 52. Also, 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. This makes it possible to prevent dust from being attracted into 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 not be provided with the first sealing portion 73, and may be configured to perform sealing only with the second sealing portion 65 described above.

[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] Because the electric vacuum cleaner 1 of this embodiment is configured as described above, it is possible to introduce a dust-containing airflow from the dust collection section inlet 52b into the dust collection 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, because the electric vacuum cleaner 1 of this embodiment is configured as described above, after the air and the dust are separated in the dust collection space 56, the airflow that passes through the tapered section 70A and rises to one axial side can be discharged to the outside of the dust collection section 50 through the airflow outlet section 67. Therefore, with 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 so as 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] Because vacuum cleaner 1 of the present embodiment is configured as described above, it is possible to introduce airflow containing dust from dust-collection section inlet 52b into dust collection space 56 between tapered section 70A and outer cylinder bottom section 52c of outer cylinder 52, and separate the air and the dust. Therefore, with vacuum cleaner 1 of the present embodiment, dust such as hair and dust is less likely to become entangled in 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, vacuum cleaner 1 of the present embodiment can introduce airflow from dust collection section inlet 52b into dust collection space 56 at a position closer to tapered section 70A than outer cylinder bottom section 52c in the axial direction. This allows dust contained in the airflow swirling inside dust collection space 56 to be smoothly guided to the other side in the axial direction by tapered section 70A, thereby preventing the dust from becoming entangled with structure 54.

[0075] (13) In this embodiment, the electric vacuum cleaner 1 of 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, with the above-described configuration, can capture dust contained in the airflow coming out of the dust collection space 56 accurately.

[0077] (14) In the present 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 thereof.

[0078] As described above, the vacuum cleaner 1 of this embodiment is provided with the mesh member 82 made of a resin material, a metal material, or a combination thereof, so that the mesh member 82 can accurately capture dust. 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 a mesh member 82 made of the material described above is provided, but the present invention is not limited to this, and a mesh member 82 made of another material that is effective against the adhesion of dust may also be used.

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

[0081] With the above-described configuration, the vacuum cleaner 1 of this embodiment can capture dust contained in the airflow passing through the airflow outlet portion 67. Furthermore, 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] The electric vacuum cleaner 1 of this embodiment is configured as described above, so that dust does not get into the boundary between the first guide portion 74 and the second guide portion 76.

[0084] (17) The electric 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 this embodiment is configured as described above, and therefore can smoothly swirl the airflow that flows into the dust collection space 56 along the second guide portion 76.

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

[0087] Because the vacuum cleaner 1 of the present embodiment is configured as described above, the airflow that flows from dust collection unit inlet 52b into dust collection space 56 and then attempts to reach dust collection unit inlet 52b can be guided toward outer cylinder bottom 52c. This prevents the airflow that flows in from dust collection unit inlet 52b from swirling without moving further toward outer cylinder bottom 52c than the position of dust collection unit inlet 52b, and prevents dust such as hair and dirt from becoming entangled near dust collection unit 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 surface of the first inner tube 60 is arranged in the internal space 84.

[0089] In the vacuum cleaner 1 of this embodiment, the airflow that flows from the first inner cylinder 60 into the internal space 84 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 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 a third guide portion 78 is provided is shown, but the present invention is not limited to this, and a configuration may be adopted 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 electric vacuum cleaner 1 of this embodiment may be characterized by having 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 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 as a configuration in which the airtightness between the first inner cylinder 60 and the outer cylinder 52 is improved by providing both the first airtight member 70d and the second airtight member 64e, the same effects as those 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 electric 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 that include an axis passing through the axial center position of the dust collection unit 50 and are perpendicular to each other, the dust collection unit inlet 52b is connected to the interior of the dust collection 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 virtual region X1 (virtual region X2 in the illustrated example).

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

[0095] (22) The electric 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 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] Because the vacuum cleaner 1 of this embodiment is configured as described above, most of the airflow flowing in from the dust collection section inlet 52b can be made to flow along the outer peripheral surface of the first inner cylinder 60 and the inner peripheral surface of the outer cylinder 52. This reduces the possibility that the airflow flowing in from the dust collection section inlet 52b will collide with the outer peripheral surface of the first inner cylinder 60 or the inner peripheral surface of the outer cylinder 52 and be attenuated, and allows the airflow to flow smoothly and forcefully into the dust collection 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, in which dust such as hair and dirt easily gets 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 unit 50 that is detachable from the vacuum cleaner body 10. The dust collection unit 50 is characterized by comprising an outer tube 52 having a dust collection unit inlet 52b and an opening 52a provided on one side in the axial direction, a structure 54 arranged inside the outer tube 52, a dust collection space 56 formed between the outer tube 52 and the structure 54, and a first guide portion 74 that extends between the structure 54 and the outer tube 52 from a position upstream in the swirling direction of the airflow so as to approach the dust collection unit inlet 52b as it moves from one side to the other in the axial direction.

[0098] Because the vacuum cleaner 1 of this embodiment is provided with the first guide portion 74 as described above, the airflow that flows into the dust collection space 56 from the dust collection unit inlet 52b is guided by the first guide portion 74 and smoothly directed 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 unit inlet 52b and is generated on one axial side (upper side) can be made to easily flow toward the other axial side. This makes it possible to prevent dust such as hair and dust contained in the airflow from becoming entangled around the structure 54. Therefore, it is possible to provide a vacuum cleaner that can prevent dust such as hair and dust from becoming entangled in the dust collection 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, based on the teachings and spirit of the invention. The components of the above-described embodiments may be arbitrarily selected and combined. Furthermore, any component of the embodiment may be arbitrarily combined with any component described in the Summary of the Invention or any component embodying any component described in the Summary of the Invention. The present invention intends to obtain rights to these as well through amendments to this application or divisional applications, etc. [Industrial Applicability]

[0100] The present invention can be suitably used in general 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 unit 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 Area X4 :Virtual area

Claims

1. a vacuum cleaner body having an electric blower; a dust collecting unit that is detachable from the vacuum cleaner body, the dust collection unit includes an outer cylinder provided with a dust collection unit inlet that introduces air in a tangential direction of an inner peripheral surface, a structure disposed inside the outer cylinder, and a dust collection space formed between the outer cylinder and the structure, the outer cylinder is open on one side in the axial direction and has an openable and closable lid at the bottom of the outer cylinder on the other side in the axial direction; the structure includes an inner cylinder having a tapered portion formed so that the outer shape becomes smaller from one side in the axial direction toward the other side in the axial direction, The inner cylinder is closed on the other side in the axial direction, the tapered portion is provided with an air vent that communicates the inside with the outside to exhaust air from the dust collection space, and is provided with a first guide portion on an outer periphery that guides an airflow from one side in the axial direction to the other side in the axial direction, The vacuum cleaner is characterized in that the bottom of the outer cylinder is provided with a restricting rib that extends toward the structure and restricts the movement of dust caused by the swirling air current.

2. 2. The electric vacuum cleaner according to claim 1, wherein the dust collection unit inlet is disposed on the other side of the tapered portion in the axial direction.

3. the dust collecting unit has a second guide portion that guides the airflow flowing from the dust collecting unit inlet into the dust collecting space, The electric vacuum cleaner according to claim 1 or 2, wherein the second guide portion is provided between the inner cylinder and the outer cylinder so as to extend in a direction intersecting with the axial direction.

4. 4. The vacuum cleaner according to claim 1, wherein the inner cylinder has a cylindrical extending portion extending from the tapered portion toward the other side in the axial direction.

5. The vacuum cleaner according to claim 4, wherein the extension portion is formed so as to reach the bottom of the outer cylinder from the tapered portion.

6. 5. The vacuum cleaner according to claim 4, wherein the tapered portion has a closing portion on the other side in the axial direction, and the extending portion is formed so as to surround the periphery of the closing portion.

7. The structure is one side cylindrical portion disposed on one side in the axial direction, 7. The electric vacuum cleaner according to claim 1, wherein the inner cylinder is connected to the one side cylinder portion.

8. The structure is one side cylindrical portion disposed on one side in the axial direction, an airflow outlet portion for discharging air to the outside of the dust collection space, and a connector disposed inside the inner cylinder so as to extend in the axial direction; 7. The electric vacuum cleaner according to claim 1, wherein the inner cylinder and the connector are connected to each other.

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