Wet and dry vacuum cleaner accessories and vacuuming systems

Abstract

The present invention discloses a wet and dry vacuum cleaner accessory and a vacuum system, which comprises: a cover plate located at the top, a base that can be placed on a horizontal plane and fixedly connected to the cover plate, an extension portion extending from the base to the rear end, a dust cup at least partially arranged on the extension portion or the base and having an air outlet, a dust suction chamber formed by at least the front end of the cover plate or the base and located upstream of the dust cup, and a float arranged in the dust cup, wherein the float closes the air outlet and stops working under the action of the sucked liquid. The present invention ensures that it can be used in a wet environment by having a built-in float, which is convenient for users to use in both dry and wet environments, which not only reduces the weight of the vacuum cleaner itself but also facilitates the miniaturization of the whole machine.

Description

Technical Field

[0001] The present invention relates to an attachment for a wet / dry vacuum cleaner and a vacuuming system. Background Art

[0002] With the improvement of domestic living standards, vacuum cleaners are increasingly favored by domestic users, and the accessories for vacuum cleaners have also been further developed. How to ensure that the vacuum cleaner accessories can be used in both dry and wet environments is a major technical problem in the industry. Summary of the Invention

[0003] The object of the present invention is to provide an attachment for a wet / dry vacuum cleaner, which can ensure use in a wet environment by having a built-in float, facilitating use by users in both dry and wet environments.

[0004] The first technical solution of the present invention is: an attachment for a wet / dry vacuum cleaner, which includes a cover plate located above, a base that can be placed on a horizontal plane and is fixedly connected to the cover plate, an extension part extending backward from the base, a dust cup at least partially disposed on the extension part or the base and having an air outlet hole, a vacuuming chamber formed at least by the front end of the cover plate or the base and located upstream of the dust cup, and a float disposed in the dust cup, wherein the float closes the air outlet hole under the action of the inhaled liquid and stops working.

[0005] On the basis of the above technical solution, the following subsidiary technical solutions are further included:

[0006] Preferably, it further includes a roller brush body disposed in the vacuuming chamber and a motor that provides rotational power to the roller brush body to efficiently clean the ground.

[0007] Preferably, it further includes a roller disposed at the bottom end of the extension part and a connecting head hingedly connected to the rear end of the extension part, wherein the central axis of the connecting head passes through the dust cup to shorten the length of the air duct and reduce air duct losses.

[0008] Preferably, the roller brush body is a water-absorbing fluff roller brush body, and its diameter is greater than 1 / 2 of the height of the vacuuming chamber and less than 5 / 6 of the height of the vacuuming chamber to achieve the suction of large particle dirt.

[0009] Preferably, the dust cup includes a cup body, a float holder disposed in the cup body and having a plurality of filter holes, a float disposed in the float holder and capable of moving vertically relative thereto, and a cup cover that closes the upper end of the cup body and has a deflector, wherein the deflector is located on one side of the float holder, and the filter holes are located on the other side of the float holder to prevent the air flow from directly hitting the filter holes and causing blockage.

[0010] The second technical solution of the present invention is: a vacuuming system, which includes: a handheld vacuum cleaner, and a wet-dry dual-purpose vacuum cleaner accessory directly or indirectly connected to the handheld vacuum cleaner. The handheld vacuum cleaner is a dustbag vacuum cleaner or a cyclone vacuum cleaner. The wet-dry dual-purpose vacuum cleaner accessory is characterized by including: a cover plate located above, a base that can be placed on a horizontal plane and is fixedly connected to the cover plate, an extension part extending backward from the base, a dust cup at least partially disposed on the extension part or the base and having air outlet holes, a vacuuming chamber formed at least by the front end of the cover plate or the base and located upstream of the dust cup, and a float disposed in the dust cup. The float closes the air outlet holes under the action of the inhaled liquid and stops working.

[0011] Preferably, it further includes a roller brush body disposed in the vacuuming chamber, and a motor that provides rotational power to the roller brush body. The cross-section of the float is elliptical to effectively utilize the internal space of the float holder.

[0012] Preferably, it further includes a roller disposed at the bottom end of the extension part, and a connector hingedly connected to the rear end of the extension part. The central axis of the connector passes through the dust cup.

[0013] Preferably, the roller brush body is a water-absorbing fluff roller brush body, and its diameter is greater than 1 / 2 of the height of the vacuuming chamber and less than 5 / 6 of the height of the vacuuming chamber.

[0014] Preferably, the dust cup includes a cup body, a float holder disposed in the cup body and having a plurality of filter holes, a float disposed in the float holder and capable of relatively vertical movement, and a cup cover that closes the upper end of the cup body and has a flow guide plate. The flow guide plate is located on one side of the float holder, and the filter holes are located on the other side of the float holder.

[0015] The third technical solution of the present invention is: a wet-dry dual-purpose vacuum cleaner accessory, which includes a cover plate located above, a base that can be placed on a horizontal plane and is fixedly connected to the cover plate, an extension part extending backward from the base, a dust cup at least partially disposed on the extension part or the base and having air outlet holes, a vacuuming chamber formed at least by the front end of the cover plate or the base and located upstream of the dust cup, a float holder disposed in the cup body and having a plurality of filter holes, and a float disposed in the float holder and capable of relatively vertical movement. Airflow enters the float holder through the filter holes and flows out through the air outlet holes, and stops working when the float closes the air outlet holes.

[0016] The advantages of the present invention are: by having a self-contained float, it ensures that it can be used in a wet environment, facilitating users to use it in both dry and wet environments. It not only reduces the weight of the vacuum cleaner itself but also is conducive to the miniaturization of the whole machine. Description of the Drawings

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0018] Figure 1 is a perspective view of the present invention;

[0019] Figure 2 is a cross-sectional view of the present invention;

[0020] Figure 3 is Figure 1 exploded view of. Detailed implementation mode

[0021] Embodiment: As Figures 1-3 shown, the present invention provides a first embodiment of a wet and dry dual-purpose vacuum cleaner accessory, which includes a cover plate 100 located above, a base 110 that can be placed on a horizontal plane and is fixedly connected to the cover plate 100, an extension portion 120 extending backward from the base 110, a dust cup 200 at least partially disposed on the extension portion 120 or the base 110 and having an air outlet hole 254, a dust suction chamber 140 formed at least by the front end of the cover plate 100 or the base 110 and located upstream of the dust cup 200, and a float 232 disposed in the dust cup 200, wherein the float 232 closes the air outlet hole 254 under the action of the inhaled liquid and stops working.

[0022] Preferably, it further includes a roller 125 disposed at the bottom end of the extension portion 120, a connection head 130 hingedly connected to the rear end of the extension portion 120, a roller brush body 150 disposed in the dust suction chamber 140, and a motor that provides rotational power to the roller brush body 150. It can be understood that the present invention can also use a pneumatic method to replace the electric drive, wherein the pneumatic method can include a wind wheel driven by air flow, or the roller brush body itself is driven by air flow. At the same time, the central axis of the connection head 130 passes through the dust cup 200 so that the air flow channel is shorter and the air volume loss is reduced. The inside of the connection head 130 is hollow and has a connection cavity 135 located downstream of the air outlet hole 254.

[0023] The base 110 further includes a dust cup chamber 160 located at the rear side of the dust suction chamber 140 and communicating with the rear side of the dust suction chamber 140 for receiving the dust cup 200, and a dust suction guiding pipe 145 connecting the dust suction chamber 140 and the dust cup 200. The dust suction guiding pipe 145 extends at least backward and upward, reducing the length of the air flow channel and reducing the air volume loss.

[0024] Preferably, the roller brush body 150 is a water-absorbing fluff roller brush body, and its diameter is greater than 1 / 2 of the height of the dust suction chamber 140 and less than 5 / 6 of the height of the dust suction chamber 140 to achieve the inhalation of large-particle debris and the large-area cleaning of the ground.

[0025] The dust cup 200 includes a cup body 210, a float holder 220 disposed within the cup body 210 and having a plurality of filter holes 224, a float 230 disposed within the float holder 220 and capable of moving vertically relative thereto, and a cup lid 250 closing the upper end of the cup body 210 and having a flow guide plate 252. The flow guide plate 252 is located on one side of the float holder 220, while the filter holes 224 are located on the other side of the float holder 220 to prevent dust from directly hitting the filter holes 224 and causing clogging. The cup body 210 is generally cylindrical and includes a dust cup notch 211 allowing the insertion of a dust suction guide tube 145, a docking port 212 located within the dust cup notch 211 and docking with the end of the dust suction guide tube 145, a guide wall 213 extending upward around the docking port 212, and a dust cup cavity 216 located on one side of the guide wall 213. The docking port 212 is inclined, and the front end of the docking port 212 is closer to the cup lid 250 than its rear end. At the same time, the guide wall 213 has the same inclination direction as the docking port 212 to increase the air intake area. The rear side of the top of the guide wall 213 is higher than the end of the flow guide plate 252, and an air flow channel is formed between the rear side and the flow guide plate 252 to orderly guide the dust-containing air flow downward by the flow guide plate 252. The lower edge of the filter holes 224 is located above the end of the flow guide plate 252 so that in a cyclone or inertial manner, the air flow enters into the filter holes 224, while the coarse dust enters into the bottom of the dust cup cavity 216. A locking portion 218 for rotationally locking with the cup lid 250 is further provided at the top of the cup body 210. The filter holes 224 can be long slot holes, round holes, mesh holes, etc.

[0026] The float holder 220 is disposed within the dust cup cavity 216, with one side close to the flow guide plate 252 and connected and fixed to the cup lid 250. There is an air flow channel between the bottom of the float holder 220 and the bottom of the dust cup cavity 216, while the top is open and includes a float cavity 223 for receiving the float 230, a pair of guide rail grooves 226 located at both ends of the float cavity 223 and communicating with the float cavity 223, and fixing ears 228 adjacent to the corresponding guide rail grooves 226 and fixed to the cup lid 250 by screws. The cross-sectional area of the float 230 is smaller than that of the float cavity 223, and it includes a hollow cavity 232 with an inner void and a pair of guide rails 234 corresponding to the guide rail grooves 226. The cup lid 250 is provided with an air outlet hole 254 communicating with the downstream of the float cavity 223. At the same time, at least part of the surface of the float holder 220 is an arc-shaped surface to enable the air flow to more smoothly enter into the float holder 220, that is, into the float cavity 223, along the arc-shaped surface.

[0027] The dust cup 200 further includes a dust cup sealing ring 240 located between the cup body 210 and the cup cover 250, and an upper cover 260 located above the cup cover 250 and detachable. Inside the upper cover 260, there is an upper cover cavity 261 downstream of the air outlet hole 254, a dust cup air outlet 262 downstream of the upper cover cavity 261, and an air guide pipe 264 that is inclined downward and connects the upper cover cavity 261 and the dust cup air outlet 262. The upper cover cavity 261 can prevent filter elements such as sponges or HEPA filters to further filter dust or absorb moisture.

[0028] As Figures 1-3 shown, the present invention provides a second embodiment of a vacuuming system, which includes a hand-held vacuum cleaner and a wet / dry vacuum cleaner attachment directly or indirectly connected to the hand-held vacuum cleaner. The hand-held vacuum cleaner is a dust bag vacuum cleaner or a cyclone vacuum cleaner. The wet / dry vacuum cleaner attachment includes: a cover plate 100 located above, a base 110 that can be placed on a horizontal plane and fixedly connected to the cover plate 100, an extension 120 extending backward from the base 110, a dust cup 200 at least partially disposed on the extension 120 or the base 110 and having an air outlet hole 254, a vacuuming chamber 140 formed at least by the front end of the cover plate 100 or the base 110 and located upstream of the dust cup 200, and a float 232 disposed in the dust cup 200. The float 232 closes the air outlet hole 254 under the action of the inhaled liquid and stops working.

[0029] Preferably, it further includes a roller brush body 150 disposed in the vacuuming chamber 140, a motor that provides rotational power to the roller brush body 150, and a vacuuming guide pipe 145 that connects the vacuuming chamber 140 and the dust cup 200.

[0030] Preferably, it further includes a roller 125 disposed at the bottom end of the extension 120 and a connecting head 130 hingedly connected to the rear end of the extension 120. The central axis of the connecting head 130 passes through the dust cup 200, and the roller 125 is located between the connecting head 130 and the dust cup 200. The inside of the connecting head 130 is hollow and has a connecting cavity 135 downstream of the air outlet hole 254.

[0031] Preferably, the roller brush body 150 is a water-absorbing fluff roller brush body, and its diameter is greater than 1 / 2 of the height of the vacuuming chamber 140 and less than 5 / 6 of the height of the vacuuming chamber 140.

[0032] The dust cup 200 includes a cup body 210, a float holder 220 disposed within the cup body 210 and having a plurality of filter holes 224, a float 230 disposed within the float holder 220 and capable of moving vertically relative thereto, and a cup lid 250 closing the upper end of the cup body 210 and having a deflector 252. The deflector 252 is located on one side of the float holder 220, while the filter holes 224 are located on the other side of the float holder 220 to prevent dust from directly hitting the filter holes 224 and causing clogging. The cup body 210 is generally cylindrical, and includes a dust cup notch 211 allowing the insertion of a dust suction guiding tube 145, a docking port 212 located within the dust cup notch 211 and docking with the end of the dust suction guiding tube 145, a guiding wall 213 extending upwardly around the docking port 212, and a dust cup cavity 216 located on one side of the guiding wall 213. The docking port 212 is inclined, and the front end of the docking port 212 is closer to the cup lid 250 than its rear end. At the same time, the guiding wall 213 has the same inclination direction as the docking port 212 to increase the air inlet area. The rear side of the top of the guiding wall 213 is higher than the end of the deflector 252, and an air flow channel is formed between the rear side and the deflector 252 to enable the dust-containing air flow to be orderly guided downward by the deflector 252. The lower edge of the filter holes 224 is located above the end of the deflector 252 so that, in a cyclone or inertial manner, the air flow enters the filter holes 224 while the coarse dust enters the bottom of the dust cup cavity 216. A locking portion 218 for rotationally locking with the cup lid 250 is further provided at the top of the cup body 210. The filter holes 224 can be long slot holes, round holes, mesh holes, etc.

[0033] The float holder 220 is disposed within the dust cup cavity 216, with one side close to the deflector 252 and connected and fixed to the cup lid 250. There is an air flow channel between the bottom of the float holder 220 and the bottom of the dust cup cavity 216, while the top is open and includes a float cavity 223 for receiving the float 230, a pair of guide rail grooves 226 located at both ends of the float cavity 223 and communicating with the float cavity 223, and fixing ears 228 adjacent to the corresponding guide rail grooves 226 and fixed to the cup lid 250 by screws. The cross-sectional area of the float 230 is smaller than that of the float cavity 223, and includes a hollow cavity 232 with an inner void, and a pair of guide rails 234 corresponding to the guide rail grooves 226. The cup lid 250 is provided with an air outlet hole 254 communicating with the downstream of the float cavity 223.

[0034] The dust cup 200 further includes a dust cup sealing ring 240 located between the cup body 210 and the cup lid 250, and an upper lid 260 located above the cup lid 250 and detachable. The upper lid 260 has an upper lid cavity 261 located downstream of the air outlet hole 254, a dust cup air outlet 262 located downstream of the upper lid cavity 261, and a guiding air tube 264 connecting the upper lid cavity 261 and the dust cup air outlet 262 and inclined downward. The upper lid cavity 261 can prevent filter elements such as sponges or HEPA to further filter dust or absorb moisture.

[0035] The present invention provides a third embodiment of a wet / dry vacuum cleaner accessory, which includes: a cover plate 100 located above, a base 110 that can be placed on a horizontal plane and is fixedly connected to the cover plate 100, an extension portion 120 extending rearward from the base 110, a dust cup 200 at least partially disposed on the extension portion 120 or the base 110 and having an air outlet hole 254, a dust suction chamber 140 formed at least by the front end of the cover plate 100 or the base 110 and located upstream of the dust cup 200, a float frame 220 disposed in the cup body 210 and having a plurality of filter holes 224, and a float 230 disposed in the float frame 220 and capable of moving vertically relative thereto, wherein air flow enters the float frame 220 through the filter holes 224 and flows out through the air outlet hole 254, and the operation stops when the float 232 closes the air outlet hole 254.

[0036] Preferably, it further includes a roller brush body 150 disposed in the dust suction chamber 140, a motor that provides rotational power to the roller brush body 150, and a dust suction guide pipe 145 connecting the dust suction chamber 140 and the dust cup 200.

[0037] Preferably, it further includes a roller 125 disposed at the bottom end of the extension portion 120 and a connector 130 hinge-connected to the rear end of the extension portion 120, wherein the central axis of the connector 130 passes through the dust cup 200, and the roller 125 is located between the connector 130 and the dust cup 200. The interior of the connector 130 is hollow and has a connection cavity 135 located downstream of the air outlet hole 254.

[0038] Preferably, the roller brush body 150 is a water-absorbable fluff roller brush body, and its diameter is greater than 1 / 2 of the height of the dust suction chamber 140 and less than 5 / 6 of the height of the dust suction chamber 140.

[0039] The dust cup 200 includes a cup body 210, a float holder 220 disposed within the cup body 210 and having a plurality of filter holes 224, a float 230 disposed within the float holder 220 and capable of moving vertically relative thereto, and a cup lid 250 closing the upper end of the cup body 210 and having a flow guide plate 252. The flow guide plate 252 is located on one side of the float holder 220, while the filter holes 224 are located on the other side of the float holder 220 to prevent dust from directly hitting the filter holes 224 and causing blockage. The cup body 210 is generally cylindrical and includes a dust cup notch 211 allowing the insertion of a dust suction guide tube 145, a docking port 212 located within the dust cup notch 211 and docking with the end of the dust suction guide tube 145, a guide wall 213 extending upwardly around the docking port 212, and a dust cup cavity 216 located on one side of the guide wall 213. The docking port 212 is inclined, and the front end of the docking port 212 is closer to the cup lid 250 than its rear end. At the same time, the guide wall 213 also has the same inclination direction as the docking port 212 to increase the air intake area. The rear side of the top of the guide wall 213 is higher than the end of the flow guide plate 252, and an air flow channel is formed between the rear side and the flow guide plate 252 to enable the dust-containing air flow to be orderly guided downward by the flow guide plate 252. The lower edge of the filter hole 224 is located above the end of the flow guide plate 252 so that, in a cyclone or inertial manner, the air flow enters the filter hole 224, while the coarse dust enters the bottom of the dust cup cavity 216. A locking portion 218 for rotatably locking with the cup lid 250 is further provided at the top of the cup body 210. The filter hole 224 can be a long slot hole, a round hole, a mesh hole, etc.

[0040] The float holder 220 is disposed within the dust cup cavity 216, with one side close to the flow guide plate 252 and connected and fixed to the cup lid 250. There is an air flow channel between the bottom of the float holder 220 and the bottom of the dust cup cavity 216, while the top is open and includes a float cavity 223 for receiving the float 230, a pair of guide rail grooves 226 located at both ends of the float cavity 223 and communicating with the float cavity 223, and fixing ears 228 adjacent to the corresponding guide rail grooves 226 and fixed to the cup lid 250 by screws. The cross-sectional area of the float 230 is smaller than that of the float cavity 223, and it includes a hollow cavity 232 with an inner void and a pair of guide rails 234 provided corresponding to the guide rail grooves 226. The cup lid 250 is provided with an air outlet hole 254 communicating with the downstream of the float cavity 223.

[0041] The dust cup 200 further includes a dust cup sealing ring 240 located between the cup body 210 and the cup lid 250, and an upper lid 260 located above the cup lid 250 and detachable. The upper lid 260 has an upper lid cavity 261 located downstream of the air outlet hole 254, a dust cup air outlet 262 located downstream of the upper lid cavity 261, and a guide pipe 264 connecting the upper lid cavity 261 and the dust cup air outlet 262 and inclined downward. The upper lid cavity 261 can prevent filter elements such as sponges or HEPA filters to further filter dust or absorb moisture.

[0042] Since the vacuum cleaner accessory in the present invention ensures its usability even in a wet environment by means of a built-in float, it is convenient for users to use it in both dry and wet environments, which not only reduces the weight of the vacuum cleaner itself but also facilitates the miniaturization of the whole machine, especially the miniaturization of the hand-held vacuum cleaner.

[0043] Various modifications to these embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wet and dry dual-purpose vacuum cleaner accessory, characterized in that It includes: a cover plate (100) located above, a base (110) that can be placed on a horizontal plane and is fixedly connected to the cover plate (100), an extension portion (120) extending rearward from the base (110), a dust cup (200) at least partially disposed on the extension portion (120) or the base (110) and having an air outlet hole (254), a dust suction chamber (140) formed at least by the front end of the cover plate (100) or the base (110) and located upstream of the dust cup (200), and a float (230) disposed in the dust cup (200), wherein the float (230) closes the air outlet hole (254) under the action of the inhaled liquid and stops working; wherein the dust cup (200) includes a cup body (210), a float holder (220) disposed in the cup body (210) and having a plurality of filter holes (224), a float (230) disposed in the float holder (220) and capable of moving vertically relative to each other, and a cup cover (250) closing the upper end of the cup body (210) and having a flow guide plate (252), wherein the flow guide plate (252) is located on one side of the float holder (220), and the filter holes (224) are located on the other side of the float holder (220).

2. The wet and dry dual-purpose vacuum cleaner accessory according to claim 1, wherein It further includes a roller brush body (150) disposed in the dust suction chamber (140), and a motor for providing rotational power to the roller brush body (150), wherein the dust cup (200) further includes a dust cup sealing ring (240) located between the cup body (210) and the cup cover (250), and an upper cover (260) located above the cup cover (250) and detachable.

3. The wet and dry dual-purpose vacuum cleaner accessory according to claim 2, wherein: It further includes a roller (125) disposed at the bottom end of the extension portion (120), and a connector (130) hinge-connected to the rear end of the extension portion (120), wherein the central axis of the connector (130) passes through the dust cup (200).

4. The wet / dry vacuum cleaner accessory according to claim 3, characterized in that: The roller brush body (150) is a water-absorbing fluff roller brush body, and its diameter is greater than 1 / 2 of the height of the dust suction chamber (140) and less than 5 / 6 of the height of the dust suction chamber (140).

5. A vacuuming system, comprising: A hand-held vacuum cleaner, a wet-dry vacuum cleaner accessory directly or indirectly connected to the hand-held vacuum cleaner, wherein the hand-held vacuum cleaner is a bagged vacuum cleaner or a cyclone vacuum cleaner, characterized in that the wet-dry vacuum cleaner accessory includes: a cover plate (100) located above, a base (110) that can be placed on a horizontal plane and is fixedly connected to the cover plate (100), an extension part (120) extending backward from the base (110), a dust cup (200) at least partially disposed on the extension part (120) or the base (110) and having an air outlet hole (254), a dust suction chamber (140) formed at least by the front end of the cover plate (100) or the base (110) and located upstream of the dust cup (200), and a float (230) disposed in the dust cup (200), wherein the float (230) closes the air outlet hole (254) under the action of the inhaled liquid and stops working; wherein the dust cup (200) includes a cup body (210), a float holder (220) disposed in the cup body (210) and having a plurality of filter holes (224), a float (230) disposed in the float holder (220) and capable of moving vertically relative to each other, and a cup cover (250) closing the upper end of the cup body (210) and having a flow guide plate (252), wherein the flow guide plate (252) is located on one side of the float holder (220), and the filter holes (224) are located on the other side of the float holder (220).

6. The vacuuming system according to claim 5, characterized in that It further includes a rotary brush body (150) disposed in the dust suction chamber (140), and a motor that provides rotational power to the rotary brush body (150), wherein the cross section of the float (230) is an ellipse, and the dust cup (200) further includes a dust cup sealing ring (240) located between the cup body (210) and the cup cover (250), and an upper cover (260) located above the cup cover (250) and detachable.

7. The vacuuming system according to claim 6, wherein It further includes a roller (125) disposed at the bottom end of the extension part (120), and a connector (130) hingedly connected to the rear end of the extension part (120), wherein the central axis of the connector (130) passes through the dust cup (200).

8. The vacuuming system according to claim 7, wherein It includes: The rotary brush body (150) is a water-absorbable fluff rotary brush body, and its diameter is greater than 1 / 2 of the height of the dust suction chamber (140) and less than 5 / 6 of the height of the dust suction chamber (140).

9. A wet and dry vacuum cleaner accessory, characterized in that It includes: An upper cover plate (100), a base (110) that can be placed on a horizontal plane and is fixedly connected to the cover plate (100), an extension part (120) extending backward from the base (110), a dust cup (200) at least partially disposed on the extension part (120) or the base (110) and having an air outlet hole (254), a dust suction chamber (140) formed at least by the front end of the cover plate (100) or the base (110) and located upstream of the dust cup (200), a float bracket (220) disposed in the cup body (210) and having a plurality of filter holes (224), a float (230) disposed in the float bracket (220) and capable of moving vertically relative thereto, and a cup cover (250) closing the upper end of the cup body (210) and having a flow guide plate (252), wherein the flow guide plate (252) is located on one side of the float bracket (220), and the filter holes (224) are located on the other side of the float bracket (220), wherein air flow enters the float bracket (220) through the filter holes (224) and flows out through the air outlet hole (254), and stops working when the float (230) closes the air outlet hole (254).

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