Patent application title:

Dust Collection Device for Vacuum Cleaner

Publication number:

US20260182801A1

Publication date:
Application number:

19/223,835

Filed date:

2025-05-30

Smart Summary: A dust collection device for vacuum cleaners has two parts: one is cylindrical and the other is conical. These parts connect at their larger openings and can be easily detached. Each part has an opening that connects to the vacuum's separation device. This design allows users to take apart the device for easier cleaning. Overall, it makes maintaining the vacuum cleaner simpler and more convenient. 🚀 TL;DR

Abstract:

A dust collection device for the vacuum cleaner includes a first dust collection part and a second dust collection part. The first dust collection part is of a cylindrical structure; the second dust collection part is of a conical structure. Large-opening ends of the first dust collection part and the second dust collection part are in detachable connection. The first dust collection part and the second dust collection part are provided with a first connection opening and a second connection opening respectively at their ends away from each other, and at least one of the first connection opening and the second connection opening is connected to a separation device of the vacuum cleaner. The dust collection device for the vacuum cleaner can be split into the first dust collection part and the second dust collection part for separate cleaning, whereby it is convenient to clean the interior of the device.

Inventors:

Applicant:

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Classification:

A47L9/1683 »  CPC main

Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners; Filters ; Dust separators; Dust removal; Automatic exchange of filters; Arrangement or disposition of cyclones or other devices with centrifugal action Dust collecting chambers; Dust collecting receptacles

A47L9/1691 »  CPC further

Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners; Filters ; Dust separators; Dust removal; Automatic exchange of filters; Arrangement or disposition of cyclones or other devices with centrifugal action Mounting or coupling means for cyclonic chamber or dust receptacles

A47L9/16 IPC

Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners; Filters ; Dust separators; Dust removal; Automatic exchange of filters Arrangement or disposition of cyclones or other devices with centrifugal action

Description

CROSS REFERENCE TO RELATED APPLICATION

This application takes priority from and claims the benefit of Chinese Patent Application No. 202423292570.0 filed on Dec. 30, 2024, the contents of which are herein incorporated by reference.

TECHNICAL FIELD

The present disclosure relates to the technical field of dust removal equipment, more particularly to a dust collection device for a vacuum cleaner.

BACKGROUND

Vacuum cleaner employs an electric motor to drive blades thereof to rotate at a high speed, generating a negative air pressure inside a sealed housing to suck up dust and debris. Vacuum cleaners are mainly divided into three types: household vacuum cleaners, commercial vacuum cleaners and industrial vacuum cleaners. Cyclone separators is one type of dust removal device, and the dust removal mechanism is to make dust-laden airflow rotate. With the help of centrifugal force, dust particles are separated from the airflow and captured onto a wall of the device. Then, with the help of gravity, the dust particles fall into a dust hopper, and the purified air is discharged via an exhaust port.

Dust collection boxes or dust hoppers of the existing vacuum cleaners are installed and used as integral bodies. For example, the patent with the application number of 201620102901.6 provides a portable vacuum cleaner, wherein a dust box includes a housing and a dustproof screen. The dustproof screen is disposed at one side of the housing opposite to an air suction device. A dust chamber is formed between a side wall of the dustproof screen and the housing. This type of dust chamber is inconvenient to demount and clean due to the limitation of a dust suction pipe. Furthermore, existing dust boxes or dust hoppers generally can only be connected to fixed positions on the vacuum cleaners, resulting in single use mode, poor flexibility of use, and limited scope of use.

SUMMARY

It is an object of the present disclosure to provide a dust collection device for a vacuum cleaner, to solve the problems in existing technologies that a dust collection box is of an integral body which is difficult to clean. The dust collection device for a vacuum cleaner according to the present disclosure can be split into two parts for separate cleaning, whereby it is convenient to clean the interior of the device, with a better cleaning effect.

A dust collection device for a vacuum cleaner provided by present application, comprising a first dust collection part and a second dust collection part, the first dust collection part being of a cylindrical structure, the second dust collection part being of a conical structure, large-opening ends of the first dust collection part and the second dust collection part being in detachable connection, the first dust collection part and the second dust collection part being provided with a first connection opening and a second connection opening respectively at their ends away from each other, and at least one of the first connection opening and the second connection opening being connected to a separation device of the vacuum cleaner.

As a preferred solution of present application, the first dust collection part and the second dust collection part are provided with an engaging buckle and an engaging block respectively at their ends close to each other, and wherein the engaging buckle and the engaging block (52) are engaged with each other.

As a preferred solution of present application, one end of the second dust collection part close to the first dust collection part is provided with an engaging edge extended outwardly, and wherein the engaging edge is formed with a clamping groove facing the opening of the first dust collection part, the clamping groove clamping a side edge of the first dust collection part, the engaging block being connected to the engaging edge, and the engaging buckle on the first dust collection part being engaged with the engaging block.

As a preferred solution of present application, an outer circumferential cylindrical wall of the first dust collection part is provided with a plurality of first reinforcement ribs, the first reinforcement ribs being arranged along an axial direction of the first dust collection part, and wherein an outer circumferential side wall of the second dust collection part is provided with a plurality of second reinforcement ribs, the second reinforcement ribs being in an arc shape and extended from the end close to the first dust collection part to the second connection opening.

As a preferred solution of present application, one end of the first dust collection part close to the first connection opening is provided with a plurality of connection positions, the plurality of connection positions being disposed evenly along an edge of the first dust collection part, and rollers being detachably installed on the connection positions, and wherein the second connection opening is connected to the separation device of the vacuum cleaner.

As a preferred solution of present application, the first connection opening is provided with a detachable cover plate, and wherein the cover plate is arranged to seal the first connection opening.

As a preferred solution of present application, a side wall of the first dust collection part is provided with a hanging assembly, and wherein the first dust collection part can be hung on a wall surface by means of the hanging assembly.

As a preferred solution of present application, the hanging assembly comprises a first hanging plate and a second hanging plate, the first hanging plate being provided with two opposite engaging grooves, and the second hanging plate being provided with two engaging hooks matched with the engaging grooves, and wherein the second hanging plate is connected to the first hanging plate by engagement of the engaging hooks into the engaging grooves.

As a preferred solution of present application, the second connection opening is detachably connected to a discharge bent pipe, an outlet end of the discharge bent pipe being provided with a blocking cover, and an upper end of the blocking cover being hinged with the discharge bent pipe.

As a preferred solution of present application, the discharge bent pipe has a bending degree α, where 60≤α<90°.

Compared to the existing technologies, the present disclosure has the following positive effects.

The dust collection device for the vacuum cleaner provided by the present disclosure includes a first dust collection part and a second dust collection part. The first dust collection part is of a cylindrical structure, and the second dust collection part is of a conical structure. Large-opening ends of the first dust collection part and the second dust collection part are in detachable connection. The first dust collection part and the second dust collection part are provided with a first connection opening and a second connection opening respectively at their ends away from each other, and at least one of the first connection opening and the second connection opening is connected to a separation device of the vacuum cleaner. According to the dust collection device for the vacuum cleaner provided by the present disclosure, the first dust collection part and the second dust collection part are provided and arranged to be detachably connected, thus when the dust collection device is removed from the vacuum cleaner to clean, the dust collection device can be split into the first dust collection part and the second dust collection part for separate cleaning, whereby it is convenient to clean the interior of the device, with a better cleaning effect. In addition, both the first connection opening and the second connection opening can be connected to the separation device of the vacuum cleaner, which increases the installation mode and improves the flexibility of use.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the technical scheme in the embodiments of the present disclosure or in the prior art, accompanying drawings required to be used in the description of the embodiments or the prior art are simply illustrated below. Apparently, the accompanying drawings described below are some embodiments of the present disclosure merely. For the ordinary skill in the field, other accompanying drawings may be obtained according to these accompanying drawings without creative effort.

FIG. 1 is a structure diagram of a first installation mode of a dust collection device for a vacuum cleaner according to the present disclosure.

FIG. 2 is a structure diagram of a hanging assembly according to the present disclosure.

FIG. 3 is a bottom view of a dust collection device for a vacuum cleaner according to the present disclosure.

FIG. 4 is a sectional view taken along A-A of FIG. 3.

FIG. 5 is a sectional view taken along B-B of FIG. 3.

FIG. 6 is a structure diagram of a second installation mode of a dust collection device for a vacuum cleaner according to the present disclosure.

FIG. 7 is a bottom side diagram of a second installation mode of a dust collection device for a vacuum cleaner according to the present disclosure.

Reference numerals in the drawings are illustrated as below. 1, first dust collection part; 11, first reinforcement rib; 12, first connection opening; 13, connection groove; 2, second dust collection part; 21, second reinforcement rib; 22, second connection opening; 23, engaging edge; 24, clamping groove; 3, discharge bent pipe; 31, blocking cover; 32, limit block; 33, connection seat; 4, hanging assembly; 41, first hanging plate; 411, engaging groove; 42, second hanging plate; 421, engaging hook; 43, installation part; 51, engaging buckle; 52, engaging block; 6, cyclone separation device; 7, roller; 71, leg; and 8, cover plate.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the description of the present disclosure, unless otherwise stated, “a plurality of” means two or more than two; the orientation or position relations indicated by such terms as “upper”, “lower”, “front”, “behind”, “left”, “right”, “top”, “bottom”, “inner”, “outer”, “front end”, “rear end”, “head” and “tail” used in the description are based on the orientation or position relations shown in the drawings, and are merely for conveniently describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element must have the specific orientation and be constructed and operated according to the specific orientation. Therefore, they should not be construed as a limitation on the present disclosure. In addition, terms such as “first”, “second”, “third”, etc. are used merely for the purpose of description, and should not be construed as indicating or implying the degrees of importance.

In the description of the present disclosure, unless otherwise specifically stated and defined, terms such as “mounting”, “interconnection”, “connection”, etc. should be interpreted expansively. For example, they may be fixed connection, also may be detachable connection, or integration; may be mechanical connection, also may be electrical connection; may be direct connection, also may be indirect connection through an intermediate. The ordinary skill in this field can understand the specific implication of the above terms in the present disclosure in accordance with specific conditions.

Specific embodiments of the present disclosure are described below in further detail in conjunction with the drawings.

Embodiment 1

The present embodiment provides a dust collection device for a vacuum cleaner, as shown in FIG. 1 to FIG. 7, including a first dust collection part 1 and a second dust collection part 2. The first dust collection part 1 is of a cylindrical structure, and the second dust collection part 2 is of a conical structure. The first dust collection part 1 of the cylindrical structure not only can increase the storage capacity of garbage, but also can avoid damage due to excessive pressure inside the dust collection device. The lower second dust collection part 2 of the conical structure increases the discharge speed of internal garbage by means of slope, so that the garbage is uneasy to accumulate inside the dust collection device.

Large-opening ends of the first dust collection part 1 and the second dust collection part 2 are in detachable connection. The first dust collection part 1 and the second dust collection part 2 are provided with a first connection opening 12 and a second connection opening 22 respectively at their ends away from each other. At least one of the first connection opening 12 and the second connection opening 22 is connected to a separation device of the vacuum cleaner, while the other connection opening serves as a discharge port or is sealed.

According to the dust collection device of the present embodiment, the first dust collection part 1 and the second dust collection part 2 are provided and arranged to be detachably connected, thus when the dust collection device is removed from the vacuum cleaner to clean, the dust collection device can be split into the first dust collection part 1 and the second dust collection part 2 for separate cleaning, whereby it is convenient to clean the interior of the device, with a better cleaning effect. In addition, both the first connection opening 12 and the second connection opening 22 of the present embodiment can be connected to the separation device of the vacuum cleaner, which increases the installation mode and improves the flexibility of use.

In one preferred embodiment, the first dust collection part 1 and the second dust collection part 2 are provided with an engaging buckle 51 and an engaging block 52 respectively at their ends close to each other. The engaging buckle 51 and the engaging block 52 are engaged with each other. When the engaging buckle 51 is installed on the first dust collection part 1, the corresponding engaging block 52 is connected to the second dust collection part 2. Or, when the engaging buckle 51 is installed on the second dust collection part 2, the corresponding engaging block 52 is connected to the first dust collection part 1. Two sets of engaging buckles 51 and engaging blocks 52 are provided, which are arranged opposite on two sides of the first dust collection part 1 and the second dust collection part 2, whereby the two sides of the first dust collection part 1 and the second dust collection part 2 are connected more securely.

In one preferred embodiment, as shown in FIG. 4, one end of the second dust collection part 2 close to the first dust collection part 1 is provided with an engaging edge 23 extended outwardly. The engaging edge 23 is formed with a clamping groove 24 facing the opening of the first dust collection part 1. The clamping groove 24 clamps a side edge of the first dust collection part 1. The engaging block 52 is connected to the engaging edge 23, and the engaging buckle 51 on the first dust collection part 1 is engaged with the engaging block 52. The engaging buckle 51 is formed with an engaging hole matched with the engaging block 52.

According to the present disclosure, the second dust collection part 2 and the first dust collection part 1 are engaged by means of the clamping groove 24, whereby the connection between the second dust collection part 2 and the first dust collection part 1 has a better tightness and air leak is avoided.

In one preferred embodiment, an outer circumferential cylindrical wall of the first dust collection part 1 is provided with a plurality of first reinforcement ribs 11. The first reinforcement ribs 11 are arranged along an axial direction of the first dust collection part 1. The first reinforcement ribs 11 are configured to support and strengthen the side wall of the first dust collection part 1, whereby the first dust collection part 1 has a better firmness.

An outer circumferential side wall of the second dust collection part 2 is provided with a plurality of second reinforcement ribs 21. The second reinforcement ribs 21 are in an arc shape and extended from the end close to the first dust collection part 1 to the second connection opening 22. The second reinforcement ribs 21 are configured to support and strengthen the side wall of the second dust collection part 2, whereby the second dust collection part 2 has a better firmness.

Both the second dust collection part 2 and the first dust collection part 1 in the present embodiment have better supporting strength, better firmness and long service life. The first dust collection part 1 and the second dust collection part 2 can be made of plastic materials or metal materials.

In one preferred embodiment, one end of the first dust collection part 1 close to the first connection opening 12 is provided with a plurality of connection positions. The plurality of connection positions are disposed evenly along an edge of the first dust collection part 1. Rollers 7 are detachably installed on the connection positions. The second connection opening 22 is connected to the separation device of the vacuum cleaner. The second connection opening 22 can be connected to a cyclone separation device of the vacuum cleaner by means of a flange.

The cyclone separation device in the present embodiment enables dust particles to fall into the dust collection device via the second connection opening 22, whereby carrying out collection of dust particles.

In particular, a connection groove 13 can be formed at the connection position. A mounting block is arranged on a leg 71. The leg 71 is installed in the connection groove 13 by means of the mounting block. A roller 7 is installed on the leg 71. Herein, the roller 7 can be a universal wheel with a brake pad, to facilitate movement in multiple directions. In addition, the leg 71 can also be directly installed at the connection position through a screw.

In one preferred embodiment, the first connection opening 12 is provided with a detachable cover plate 8. The cover plate 8 is arranged to seal the first connection opening 12. When the second connection opening 22 is connected to the separation device of the vacuum cleaner, the first connection opening 12 can be closed by means of the cover plate 8, whereby dust particles can remain inside the first dust collection part 1.

When the dust collection device of the present embodiment is in use, as shown in FIG. 6 and FIG. 7, the first dust collection part 1 is installed at a bottom side of the second dust collection part 2, the first connection opening 12 on the first dust collection part 1 is sealed by means of the cover plate 8, and the second connection opening 22 on the second dust collection part 2 is connected to the cyclone separation device of the vacuum cleaner. By installing legs 71 and rollers 7 on one end of the first dust collection part 1 close to the first connection opening 12, the dust collection device is convenient to move during usage, whereby achieving simultaneous carrying out of dust removal and movement. The dust particles separated out by the cyclone separation device enter the interior of the dust collection device through the second connection opening 22 and then fall into the first dust collection part 1. When the dust removal is ended or the dust particles inside the dust collection device are accumulated to certain height, the engaging buckle 51 and the engaging block 52 can be disengaged to separate the first dust collection part 1 from the second dust collection part 2, whereby to pour out the dust particles inside the first dust collection part 1.

In one preferred embodiment, a side wall of the first dust collection part 1 is provided with a hanging assembly 4, and the first dust collection part 1 can be hung on a wall surface by means of the hanging assembly 4. The first dust collection part 1 can be installed on a wall by means of the hanging assembly 4, whereby the dust collection device is convenient to fix and occupies no ground space.

In one preferred embodiment, the hanging assembly 4 includes a first hanging plate 41 and a second hanging plate 42. The first hanging plate 41 is provided with two opposite engaging grooves 411. The second hanging plate 42 is provided with two engaging hooks 421 matched with the engaging grooves 411. The second hanging plate 42 is connected to the first hanging plate 41 by engagement of the engaging hooks 421 into the engaging grooves 411.

As shown in FIG. 2 and FIG. 3, the first hanging plate 41 is connected to an installation part 43 on a side wall of the first dust collection part 1 through a screw, while the second hanging plate 42 is fixedly connected to a wall surface. The dust collection device can be installed on the wall surface by sliding the engaging hook 421 into the engaging groove 411 from above so that the engaging hook 421 is engaged with the engaging groove 411. In doing so, it is convenient to remove or install the dust collection device from or on the wall surface, with high flexibility of use.

In one preferred embodiment, as shown in FIG. 1 and FIG. 4, the second connection opening 22 is detachably connected to a discharge bent pipe 3. An outlet end of the discharge bent pipe 3 is provided with a blocking cover 31. An upper end of the blocking cover 31 is hinged with the discharge bent pipe 3. The blocking cover 31 can block the outlet end of the discharge bent pipe 3, whereby the interior of the dust collection device is sealed, avoiding the internal dust particles falling off. The blocking cover 31 can be of a disc shaped structure.

There is a gap between the blocking cover 31 and the outlet end of the discharge bent pipe 3 in a natural state, allowing the dust particles inside the dust collection device to fall off. When a negative pressure is formed inside the dust collection device, the blocking cover 31 will seal the outlet end of the discharge bent pipe 3, avoiding the dust particles inside the dust collection device falling off.

In one preferred embodiment, the discharge bent pipe 3 has a bending degree α, where 60≤α<90°. The bending degree of the discharge bent pipe 3 can allow a gap between the blocking cover 31 and the outlet end of the discharge bent pipe 3 when the dust collection device is in an upright state, whereby the dust particles inside the dust collection device can completely flow out in time in a natural state.

In particular, a limit block 32 is arranged at a lower side of the discharge bent pipe 3. The limit block 32 is capable of limiting the blocking cover 31 when the blocking cover 31 is covering the outlet end of the discharge bent pipe 3. A connection seat 33 is arranged at the lower side of the discharge bent pipe 3, and the limit block 32 is rotatably connected on the connection seat 33. When the blocking cover 31 is covering the outlet end of the discharge bent pipe 3, the limit block 32 can be turned to clamp on the blocking cover 31. The arrangement of the limit block 32 can facilitate manual sealing of the outlet end of the discharge bent pipe 3 with the blocking cover 31.

When the dust collection device of the present embodiment is in use, as shown in FIG. 1, the first dust collection part 1 is installed on a top of the second dust collection part 2, the first connection opening 12 on the first dust collection part 1 is connected to a cyclone separation device of a vacuum cleaner, and the second connection opening 22 on the second dust collection part 2 is connected to the discharge bent pipe 3. By arranging the hanging assembly on the first dust collection part 1, the dust collection device is convenient to hang on a wall for use, and ground occupation is avoided. The dust particles separated out by the cyclone separation device enter the interior of the dust collection device through the first connection opening 12 and then fall into the second dust collection part 2 to accumulate. When the vacuum cleaner is started, the negative pressure inside the dust collection device enables the blocking cover 31 to cover the outlet end of the discharge bent pipe 3, whereby the dust particles inside the second dust collection part 2 will not fall off. When the vacuum cleaner is shut down, the negative pressure inside the dust collection device disappears, and the blocking cover 31 opens the outlet end of the discharge bent pipe 3, allowing the dust particles inside the dust collection device to fall off. A collecting bin can be placed under the outlet end of the discharge bent pipe 3 to receive the dust particles falling off from inside the dust collection device, whereby the dust particles can fall into the collecting bin autonomously when the vacuum cleaner is shut down, making it more convenient to clean dust.

The dust collection device of the present embodiment can be used while moving on the ground, also can be hung on a wall surface for use, with multiple use methods and high flexibility.

The above are preferred implementations of the present disclosure merely, and the protection scope of the present disclosure is not limited thereto. It should be noted that, for those skilled in the art, multiple improvements and modifications can be made without departing from the thought of the present disclosure, and these improvements and modifications are intended to fall into the scope of protection of the present disclosure.

Claims

What is claimed is:

1. A dust collection device for a vacuum cleaner, comprising a first dust collection part (1) and a second dust collection part (2), the first dust collection part (1) being of a cylindrical structure, the second dust collection part (2) being of a conical structure, large-opening ends of the first dust collection part and the second dust collection part being in detachable connection, the first dust collection part (1) and the second dust collection part (2) being provided with a first connection opening (12) and a second connection opening (22) respectively at their ends away from each other, and at least one of the first connection opening (12) and the second connection opening (22) being connected to a separation device of the vacuum cleaner.

2. The dust collection device for the vacuum cleaner according to claim 1, wherein the first dust collection part (1) and the second dust collection part (2) are provided with an engaging buckle (51) and an engaging block (52) respectively at their ends close to each other, and wherein the engaging buckle (51) and the engaging block (52) are engaged with each other.

3. The dust collection device for the vacuum cleaner according to claim 2, wherein one end of the second dust collection part (2) close to the first dust collection part (1) is provided with an engaging edge (23) extended outwardly, and wherein the engaging edge (23) is formed with a clamping groove (24) facing the opening of the first dust collection part (1), the clamping groove (24) clamping a side edge of the first dust collection part (1), the engaging block (52) being connected to the engaging edge (23), and the engaging buckle (51) on the first dust collection part (1) being engaged with the engaging block (52).

4. The dust collection device for the vacuum cleaner according to claim 1, wherein an outer circumferential cylindrical wall of the first dust collection part (1) is provided with a plurality of first reinforcement ribs (11), the first reinforcement ribs (11) being arranged along an axial direction of the first dust collection part (1), and wherein an outer circumferential side wall of the second dust collection part (2) is provided with a plurality of second reinforcement ribs (21), the second reinforcement ribs (21) being in an arc shape and extended from the end close to the first dust collection part (1) to the second connection opening (22).

5. The dust collection device for the vacuum cleaner according to claim 1, wherein one end of the first dust collection part (1) close to the first connection opening (12) is provided with a plurality of connection positions, the plurality of connection positions being disposed evenly along an edge of the first dust collection part (1), and rollers (7) being detachably installed on the connection positions, and wherein the second connection opening (22) is connected to the separation device of the vacuum cleaner.

6. The dust collection device for the vacuum cleaner according to claim 5, wherein the first connection opening (12) is provided with a detachable cover plate (8), and wherein the cover plate (8) is arranged to seal the first connection opening (12).

7. The dust collection device for the vacuum cleaner according to claim 1, wherein a side wall of the first dust collection part (1) is provided with a hanging assembly (4), and wherein the first dust collection part (1) can be hung on a wall surface by means of the hanging assembly (4).

8. The dust collection device for the vacuum cleaner according to claim 7, wherein the hanging assembly (4) comprises a first hanging plate (41) and a second hanging plate the first hanging plate (41) being provided with two opposite engaging grooves (411), and the second hanging plate (42) being provided with two engaging hooks (421) matched with the engaging grooves (411), and wherein the second hanging plate (42) is connected to the first hanging plate (41) by engagement of the engaging hooks (421) into the engaging grooves (411).

9. The dust collection device for the vacuum cleaner according to claim 7, wherein the second connection opening (22) is detachably connected to a discharge bent pipe (3), an outlet end of the discharge bent pipe (3) being provided with a blocking cover (31), and an upper end of the blocking cover (31) being hinged with the discharge bent pipe (3).

10. The dust collection device for the vacuum cleaner according to claim 9, wherein the discharge bent pipe (3) has a bending degree α, where 60≤α<90°.