Dust collection device
By staggering the filter chamber, piston chamber, and transition chamber in the vacuum cleaner, the problem of the vacuum cleaner's non-compact structure is solved, achieving more efficient self-cleaning and a longer service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-03-27
AI Technical Summary
The internal structure design of existing vacuum cleaners results in an increase in overall width or height, and the layout is not compact enough, affecting service life and cleaning efficiency.
The filter and piston are placed in the filter chamber and piston chamber respectively, and a transition chamber is set between the filter chamber and piston chamber. The airflow in the piston chamber is reversed and transferred to the filter chamber through the transition chamber, so as to achieve the self-cleaning of the filter. At the same time, the chambers are staggered to reduce space waste.
This design achieves a more compact internal structure and a more rational layout for the vacuum cleaner, improving its self-cleaning effect and lifespan, and reducing the frequency of manual cleaning by users.
Smart Images
Figure CN224039091U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of mechanical design and manufacturing, and particularly relates to a dust collection device. BACKGROUND
[0002] The filter in the dust collection device generally has a self-cleaning function, aiming to reduce the frequency of manual cleaning of the filter screen by the user, ensure continuous and efficient operation of the dust collector, and be beneficial to improving the service life of the dust collection device. Generally, self-cleaning can be achieved by reverse airflow, or self-cleaning can be achieved by vibration, or self-cleaning can be achieved by an automatic emptying station. When self-cleaning is achieved by reverse airflow, the basic principle is to form an airflow by compressing gas through a piston structure to impact the filter in the reverse direction, so that the filter is self-cleaned.
[0003] In the prior art, the piston structure and the filter of some dust collection devices are accommodated in the same chamber (i.e., a piston chamber), and all the chambers are arranged in a straight line in sequence. This structure layout method increases the overall width or height size of the dust collection device, and the internal structure needs to be optimized.
[0004] Therefore, how to optimize the internal structure design of the dust collection device is a technical problem to be solved by those skilled in the art. CONTENT OF THE UTILITY MODEL
[0005] Therefore, the purpose of the present application is to provide a dust collection device which can make the internal structure of the dust collection device more compact and the layout more reasonable.
[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:
[0007] A dust collection device comprises:
[0008] A housing having an air inlet and an air outlet, the housing having a motor cavity, a filter cavity, and a piston cavity, the piston cavity being located between the motor cavity and the filter cavity;
[0009] A motor installed in the motor cavity, the motor being used to generate a negative pressure to form an airflow passage between the air inlet and the air outlet;
[0010] A filter installed in the filter cavity and located in the airflow passage, used to filter dirt in the airflow;
[0011] A piston body installed in the piston cavity, used to drive the airflow to pass through the filter in the reverse direction to clean the filter;
[0012] The housing further has a transition cavity between the filter cavity and the piston cavity, the transition cavity is arranged in a first linear direction with the piston cavity, and the transition cavity is arranged in a second linear direction with the filter cavity, wherein the first linear direction and the second linear direction have an included angle.
[0013] Optionally, in the dust collection device, a first opening is arranged on one side of the transition cavity close to the piston cavity and in communication with the piston cavity.
[0014] In the first state, the motor generates negative pressure, the piston body is away from the first opening, and the transition cavity and the piston cavity are in communication to form part of the airflow channel.
[0015] In the second state, the piston body moves towards the first opening to compress at least part of the gas in the piston cavity to enter the transition cavity through the first opening to clean the filter.
[0016] Optionally, in the dust collection device, a second opening is arranged on one side of the piston cavity close to the motor cavity.
[0017] The piston body and the piston cavity are left with a gap capable of communicating the first opening and the second opening.
[0018] Optionally, in the dust collection device, the piston cavity comprises:
[0019] A first side wall provided with the first opening;
[0020] A second side wall provided with the second opening;
[0021] A third side wall between the first side wall and the second side wall, the third side wall comprises a flat area and a curved area, the gap is arranged between the flat area and the piston body, and the curved area is provided with a groove recessed in a direction further away from the piston body relative to the flat area.
[0022] Optionally, in the dust collection device, an arc-shaped air guide surface is arranged at the connection between the flat area and the curved area.
[0023] Optionally, in the dust collection device, a gas supplement valve is further included.
[0024] The housing is provided with a gas supplement port, the gas supplement port is in communication with the air inlet of the motor and the second opening respectively;
[0025] In the first state, the gas supplement valve closes the gas supplement port.
[0026] In the second state, the gas supplement valve opens the gas supplement port.
[0027] Optionally, the dust suction device further comprises an elastic member.
[0028] In the first state, the piston body moves towards the second opening to compress the elastic member.
[0029] In the second state, the elastic member drives the piston body to move towards the first opening under the action of the elastic restoring force.
[0030] Optionally, the dust suction device further comprises a limiting portion arranged on the side of the piston cavity close to the motor cavity.
[0031] In the first state, the limiting portion is engaged with the piston body.
[0032] In the second state, the limiting portion is disengaged from the piston body.
[0033] Optionally, the limiting portion is protrudingly arranged in the piston cavity.
[0034] The side of the piston body away from the first opening is provided with an engaging portion.
[0035] The engaging portion comprises a cylindrical protrusion, and the limiting portion comprises a groove, a through hole or a gap capable of being engaged with the cylindrical protrusion; or the limiting portion comprises a cylindrical protrusion, and the engaging portion comprises a groove, a through hole or a gap capable of being engaged with the cylindrical protrusion.
[0036] Optionally, the angle between the first straight line and the second straight line is 90°.
[0037] As can be seen from the above technical solutions, in the dust suction device provided by the present application, on the one hand, the filter and the piston body are arranged in the filter cavity and the piston cavity respectively, and a transition cavity is arranged between the filter cavity and the piston cavity. During self-cleaning, the airflow generated by the compression of the piston body in the piston cavity can be reversely transmitted to the filter cavity through the transition cavity. The flow direction of the airflow is opposite to the airflow direction during the dust suction process, which can impact the filter with the airflow to blow off the dust and other pollutants attached to the filter into the dust bucket, thereby realizing the self-cleaning of the filter. On the other hand, the piston cavity and the transition cavity are arranged in the first straight line direction, and the transition cavity and the filter cavity are arranged in the second straight line direction. Compared with the arrangement of all cavities along the same straight line direction, this staggered arrangement of cavities can make the internal structure of the device more compact and the layout more reasonable. BRIEF DESCRIPTION OF DRAWINGS
[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0039] Figure 1 A front view of a dust collection device in a first state (i.e. a dust collection state) according to an embodiment of the present application.
[0040] Figure 2 A front view of a dust collection device in a second state (i.e. a self-cleaning state) according to an embodiment of the present application. Figure 1 An enlarged view of the rectangular dashed area in the middle.
[0041] Figure 3 A schematic diagram of area division of a piston cavity according to an embodiment of the present application.
[0042] Figure 4 A front view of a dust collection device in a second state (i.e. a self-cleaning state) according to an embodiment of the present application.
[0043] Figure 5 A front view of a dust collection device in a second state (i.e. a self-cleaning state) according to an embodiment of the present application. Figure 4 An enlarged view of the rectangular dashed area in the middle.
[0044] Figure 6 A front view of a dust collection device in a first state (i.e. a dust collection state) according to an embodiment of the present application.
[0045] Figure 7 A front view of a dust collection device in a second state (i.e. a self-cleaning state) according to an embodiment of the present application. Figure 6 An enlarged view of the rectangular dashed area in the middle.
[0046] Figure 8 A front view of a dust collection device in a second state (i.e. a self-cleaning state) according to an embodiment of the present application.
[0047] Figure 9 A front view of a dust collection device in a second state (i.e. a self-cleaning state) according to an embodiment of the present application. Figure 8 An enlarged view of the rectangular dashed area in the middle.
[0048] Figure 10 A structure schematic diagram of a box member for constituting a third side wall according to an embodiment of the present application.
[0049] Figure 11 A structure schematic diagram of a piston body according to an embodiment of the present application.
[0050] Figure 12 A top structure schematic diagram of a lower cover of a machine shell according to an embodiment of the present application.
[0051] Figure 13A bottom structure schematic diagram of a lower cover of a casing provided by an embodiment of the present application (the lower cover is installed with a filter, a piston body and an elastic member).
[0052] Figure 14 A zoomed-in view of the area where the piston cavity is located in Figure 13
[0053] Figure 15 A bottom structure schematic diagram of a lower cover of a casing provided by an embodiment of the present application (the lower cover is installed with a filter, a piston body and an elastic member).
[0054] Figure 16 A schematic diagram of an air flow path when a dust collection device provided by an embodiment of the present application is in a first state (i.e., a dust collection state).
[0055] Figure 17 A schematic diagram of an air flow path when a dust collection device provided by an embodiment of the present application is in a second state (i.e., a self-cleaning state).
[0056] Figure 18 A piston cavity structure in which a third cavity area is located below a piston body, and a schematic diagram of an air flow path when the piston body is in a first state (i.e., a dust collection state) provided by an embodiment of the present application.
[0057] Figure 19 A piston cavity structure in which a third cavity area is located below a piston body, and a schematic diagram of an air flow path when the piston body is in a second state (i.e., a self-cleaning state) provided by an embodiment of the present application.
[0058] Figure 20 A piston cavity structure in which a third cavity area is located above a piston body, and a schematic diagram of an air flow path when the piston body is in a first state (i.e., a dust collection state) provided by an embodiment of the present application.
[0059] Figure 21 A piston cavity structure in which a third cavity area is located above a piston body, and a schematic diagram of an air flow path when the piston body is in a second state (i.e., a self-cleaning state) provided by an embodiment of the present application.
[0060] Wherein:
[0061] 1 - filter, 2 - jet plate, 4 - motor, 5 - volute, 6 - air supplement valve,
[0062] 10 - filter cavity, 20 - transition cavity, 21 - jet hole,
[0063] 30 - piston cavity, 31 - piston body, 32 - elastic member,
[0064] 30a - first cavity area, 30b - second cavity area, 30c - third cavity area,
[0065] 40 - motor cavity, 41 - motor air inlet, 50 - main air duct, 60 - air supplement port,
[0066] 100 - air inlet, 200 - air outlet, 101 - first opening, 401 - second opening,
[0067] 301 - first side wall, 302 - second side wall, 303 - third side wall, 304 - limiting portion,
[0068] 311 - clamping portion, 312 - spring mounting portion, 331 - planar area, 332 - curved area, 333 - arc-shaped air guide surface. DETAILED DESCRIPTION
[0069] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.
[0070] Please refer to Figure 1 The dust suction device provided by the embodiments of the present application includes a shell, a motor 4, a filter 1 and a piston body 31, wherein: the shell has an air inlet 100 and an air outlet 200, and has a motor cavity 40, a filter cavity 10 and a piston cavity 30 in the shell, the piston cavity 30 is located between the motor cavity 40 and the filter cavity 10, that is, the motor cavity 40, the piston cavity 30 and the filter cavity 10 are sequentially communicated; the motor 4 is installed in the motor cavity 40 and is used to generate negative pressure to form an air flow passage between the air inlet 100 and the air outlet 200; the filter 1 is installed in the filter cavity 10 and is located in the air flow passage and is used to filter dirt in the air flow; the piston body 31 is installed in the piston cavity 30 and is used to drive the air flow to pass through the filter 1 reversely to clean the filter 1. Further, the shell further has a transition cavity 20, the transition cavity 20 is located between the filter cavity 10 and the piston cavity 30, the transition cavity 20 and the piston cavity 30 are arranged in a first straight line direction, the transition cavity 20 and the filter cavity 10 are arranged in a second straight line direction, and the first straight line and the second straight line have an included angle greater than zero. For example, as shown in the drawings, the first straight line is parallel to the second straight line, and the included angle is zero. Figure 1As shown in the figure, the transition cavity 20 and the piston cavity 30 are arranged in a first linear direction, i.e. a horizontal direction, and the transition cavity 20 and the filter cavity 10 are arranged in a second linear direction, i.e. a vertical direction perpendicular to the horizontal direction. At this time, the angle between the first linear direction and the second linear direction is 90°, and the transition cavity 20, the piston cavity 30 and the motor cavity 40 are arranged side by side in the first linear direction parallel to the horizontal direction. The transition cavity 20 is located directly above the filter 1, and the dust suction end of the filter 1 faces downward. However, it is not limited to this, and in other embodiments, the angle can also be 60° or 45° or any other angle, as long as the filter cavity 10, the transition cavity 20, the piston cavity 30 and the motor cavity 40 are sequentially connected to ensure that the dust suction device can work normally and be self-cleaning.
[0071] In the dust suction device provided by the present application, on the one hand, the filter 1 and the piston body 31 are respectively arranged in the filter cavity 10 and the piston cavity 30, and the transition cavity 20 is arranged between the filter cavity 10 and the piston cavity 30. During self-cleaning, the airflow generated by the compression of the piston body 31 in the piston cavity 30 can be reversely transmitted to the filter cavity 10 through the transition cavity 20. The flow direction of the airflow is opposite to that during the dust suction process, so that the filter 1 can be impacted by the airflow to blow off the dust and other pollutants attached to the filter 1 into the dust bucket, thereby realizing self-cleaning of the filter 1. On the other hand, the piston cavity 30 and the transition cavity 20 are arranged in a first linear direction, and the transition cavity 20 and the filter cavity 10 are arranged in a second linear direction. Compared with the arrangement of all cavities in the same linear direction, this staggered arrangement of cavities can make the internal structure of the device more compact and the layout more reasonable.
[0072] In addition, since the transition cavity 20 is located between the filter cavity 10 and the piston cavity 30, the airflow transmitted from the piston cavity 30 can be transmitted to the filter 1 through the transition cavity 20 regardless of the direction of the piston cavity 30 relative to the filter cavity 10, and the airflow filtered by the filter cavity 10 can also be transmitted to the motor cavity 40 through the transition cavity 20 and the piston cavity 30. In short, in the dust suction device provided by the present application, the transition cavity 20 is arranged, so that the relative positions of the piston cavity 30 and the filter cavity 10 can have multiple arrangement modes under the premise of ensuring the basic functions, making the product design more flexible. Therefore, in some embodiments, the arrangement direction of the transition cavity 20 and the piston cavity 30 (i.e. the first linear direction) and the arrangement direction of the transition cavity 20 and the filter cavity 10 (i.e. the second linear direction, which is also the airflow direction in the filter 1) can have an angle, and the size of the angle can be set according to actual needs, i.e. the filter cavity 10 can be arranged at any position of the piston cavity 30 according to actual needs. For example: Figure 1As shown in FIG. 1, the moving direction of the piston body 3 can be horizontal, and the transition cavity 20 is located at the right side of the piston cavity 30, and the filter cavity 10 is located at the lower side of the transition cavity 20, i.e. the filter cavity 10 is located at the lower right of the piston cavity 30. At this time, the dust removal end of the filter 1 in the dust bucket can be downward or obliquely downward. Not only the center of gravity is low, but also the accumulated dirt and other pollutants on the filter 1 can fall back to the dust bucket under the action of gravity and / or reverse airflow, so that the filter 1 has a higher cleaning effect. However, it is not limited thereto. In other embodiments, the filter cavity 10 can also be arranged at other positions of the piston cavity 30 according to actual needs.
[0073] Please refer to Figure 1 and Figure 2 In some embodiments, the side of the piston cavity 30 close to the transition cavity 20 is provided with a first opening 101, and the side of the piston cavity 30 close to the motor cavity 40 is provided with a second opening 401. Thus, the piston cavity 30 is in communication with the transition cavity 20 through the first opening 101, and the piston cavity 30 is in communication with the motor cavity 40 through the second opening 401, and the first opening 101 and the second opening 401 are in the same direction as the moving direction of the piston body 31. In addition, a gap capable of communicating the first opening 101 and the second opening 401 is left between the piston body 31 and the side wall of the piston cavity 30. In specific implementation, the gap can be formed between the bottom of the piston cavity 30 and the piston body 31 (see Figure 18 and Figure 19 for details), or in other embodiments, the gap is formed between the top of the piston cavity 30 and the piston body 31 (see Figure 20 and Figure 21 for details).
[0074] Specifically, please refer to Figure 1 and Figure 2 , Figure 6 and Figure 7 , and Figure 16 When the dust collection device is in the first state, the motor 4 generates negative pressure, and the piston body 31 moves towards the second opening 401 to move away from the first opening 101, so that the first opening 101 remains open. At this time, the filter cavity 10, the transition cavity 20 and the piston cavity 30 are sequentially communicated to form a partial airflow passage. The gas entering the dust bucket through the shell air inlet 100 passes through the filter 1, the transition cavity 20, the piston cavity 30, the motor 4 and the main air duct 50, and then flows out of the dust collection device through the shell air outlet 200, to realize the dust collection and filtration process. Please refer to Figure 4 and Figure 5 , Figure 8 and Figure 9 , and Figure 17When the dust suction device is in the second state, the piston body 31 moves quickly towards the first opening 101 until the first opening 101 is closed, so that at least part of the gas in the piston cavity 30 is compressed to form a compressed gas flow that reverses into the transition cavity 20, so that the filter 1 is impacted by the compressed gas flow, thereby achieving cleaning of the filter 1.
[0075] In some embodiments, in order to improve the impact effect of the reverse gas flow on the filter 1, a spray plate 2 is arranged on the side of the transition cavity 20 close to the filter 1, and the spray plate 2 is provided with a plurality of spray holes 21. Through the spray holes 21, the gas flow in the transition cavity 20 can be divided into multiple gas flows, and the gas flows can be guided to blow towards the filter 1, thereby playing a role of multi-hole spraying, which is beneficial to improve the cleaning effect.
[0076] Please refer to Figure 3 and Figure 10 In some embodiments, the piston cavity 30 mainly includes a first side wall 301 and a second side wall 302 arranged opposite to each other, a third side wall 303 located between the first side wall 301 and the second side wall 302, and a fourth side wall located opposite to the third side wall 303. Among them: the first side wall 301 and the second side wall 302 are respectively provided with the first opening 101 and the second opening 401; the third side wall 303 includes a planar region 331 and a curved region 332, a gap is arranged between the planar region 331 and the piston body 31, and the curved region 332 is provided with a groove recessed in a direction further away from the piston body 31 relative to the planar region 331 (i.e. the third cavity region 30c in the following). Further, an arc-shaped air guide surface 333 is arranged at the connection between the planar region 331 and the curved region 332. Through the above gap, groove and arc-shaped air guide surface 333, the gas flow from the transition cavity 20 can pass through the piston cavity 30.
[0077] Specifically, please refer to Figure 2 and Figure 3 The piston cavity 30 includes a first cavity region 30a and a second cavity region 30b arranged adjacent in a first straight line direction, and a third cavity region 30c located on the same side of the first cavity region 30a and the second cavity region 30b and communicating with both. Among them, the piston body 31 is located in the first cavity region 30a and can reciprocate in the first straight line direction; and the end side wall of the first cavity region 30a away from the second cavity region 30b is provided with the first opening 101 communicating with the transition cavity 20, and the end side wall of the second cavity region 30b away from the first cavity region 30a is provided with the second opening 401 communicating with the motor cavity 40. When the dust suction device is in the second state, the piston body 31 is away from the first opening 101 and maintains a proper distance from the second opening 401; when the dust suction device is in the second state, the piston body 31 moves to the end of the first cavity region 30a away from the second cavity region 30b and closes the first opening 101.
[0078] AsFigure 1 and Figure 2 、 Figure 6 and Figure 7 As shown in Figure 4 and Figure 5 、 Figure 8 and Figure 9 , when the dust suction device is in the first state, under the action of the negative pressure generated by the motor 4, the piston body 31 is located at one end of the first cavity area 30a close to the second cavity area 30b, and the external air passes through the shell air inlet 100, the dust bucket, the filter 1, the transition cavity 20, the first cavity area 30a, the third cavity area 30c, the second cavity area 30b, the motor cavity 40, the motor air inlet 41, the motor air outlet, the main air duct 50, and the shell air outlet 200 in sequence. At this time, the dust removal function can be realized by the filter 1, and each cavity area in the piston cavity 30 can be effectively utilized without space waste.
[0079] It should be noted that, in specific implementation, the third cavity area 30c can be located in the lower region of the piston cavity 30 (see Figure 18 and Figure 19 for details), or, in other embodiments, the third cavity area 30c can also be arranged in the upper region of the piston cavity 30 (see Figure 20 and Figure 21 for details), or, the third cavity area 30c can also be arranged on the front side and / or the rear side of the piston cavity 30. The position of the third cavity area 30c is not limited in the present application, as long as the air flow can pass through.
[0080] Please refer to Figure 1 and Figure 2 , in some embodiments, a filter passage is arranged between the second opening 401 on one side of the piston cavity 30 and the motor air inlet 41. Moreover, please refer to Figure 12 to Figure 14 , the dust suction device further comprises a gas supplement valve 6, and the shell is provided with a gas supplement port 60 which is controlled to open and close by the gas supplement valve 6. The gas supplement port 60 is in communication with the motor air inlet 41 and the second opening 401 through the filter passage. In the first state, as shown in Figure 1 and Figure 16As shown in FIG. 1, the air supplement valve 6 closes the air supplement port 60, at this time, the air inlet 100 on the shell, the dust bucket, the filter cavity 10, the transition cavity 20, the piston cavity 30, the filter passage, the motor air inlet 41, the main air duct 50 (formed by the volute 5 surrounding the motor 4), and the air outlet 200 on the shell are sequentially communicated, thereby realizing filtering and dust removal; in the second state, as shown in FIG. 2, the air supplement valve 6 opens the air supplement port 60, the filter passage can be directly communicated with the atmosphere outside the dust collection device through the air supplement port 60, thereby the air pressure in the filter passage and the second opening 401 and the region where the second cavity area 30b is located is instantaneously changed to positive pressure, while the air pressure in the first cavity area 30a and the transition cavity 20 is still negative pressure, under the action of the pressure difference on both sides, the piston body 31 moves towards the first opening 101, and at the same time, the gas in the first cavity area 30a is compressed to impact into the transition cavity 20 and the filter cavity 10, so that the filter 1 realizes self-cleaning, until the piston body 31 closes the first opening 101, and then rapidly switches to the first state. Figure 4 and Figure 17 As shown in FIG. 1, the air supplement valve 6 closes the air supplement port 60, at this time, the air inlet 100 on the shell, the dust bucket, the filter cavity 10, the transition cavity 20, the piston cavity 30, the filter passage, the motor air inlet 41, the main air duct 50 (formed by the volute 5 surrounding the motor 4), and the air outlet 200 on the shell are sequentially communicated, thereby realizing filtering and dust removal; in the second state, as shown in FIG. 2, the air supplement valve 6 opens the air supplement port 60, the filter passage can be directly communicated with the atmosphere outside the dust collection device through the air supplement port 60, thereby the air pressure in the filter passage and the second opening 401 and the region where the second cavity area 30b is located is instantaneously changed to positive pressure, while the air pressure in the first cavity area 30a and the transition cavity 20 is still negative pressure, under the action of the pressure difference on both sides, the piston body 31 moves towards the first opening 101, and at the same time, the gas in the first cavity area 30a is compressed to impact into the transition cavity 20 and the filter cavity 10, so that the filter 1 realizes self-cleaning, until the piston body 31 closes the first opening 101, and then rapidly switches to the first state.
[0081] Please refer to Figure 5 and Figure 13 and Figure 14 In some embodiments, the piston body 31 is further provided with an elastic member 32, one end of the elastic member 32 is connected with the side of the piston body 31 close to the second opening 401, and the other end is connected with the second side wall 302 of the piston cavity 30 close to the motor cavity 40. In the first state, the piston body 31 moves towards the second opening 401, so that the elastic member 32 is compressed and deformed; in the second state, the elastic member 32 is driven by the air supplement valve 6 to move the piston body 31 towards the first opening 101 under the action of the elastic restoring force, until the first opening 101 is closed. It can be seen that the elastic member 32 can provide at least part of the driving force for the piston body 31 when the piston body 31 switches from the first state to the second state. In specific implementation, the elastic member 32 is a compression spring, and the side of the piston body 31 close to the second opening 401 is provided with a spring mounting portion 312, which can be specifically referred to Figure 9 and Figure 11 The spring mounting portion 312 is a boss structure for connecting with the compression spring. When the piston body 31 moves towards the second opening 401 to a stable state in the first state, the end of the compression spring away from the piston body 31 abuts against the second side wall 302 of the motor cavity 40.
[0082] Further, the piston cavity 30 is provided with a limiting portion 304 protruding from one side close to the motor cavity 40, specifically, the limiting portion 304 is located at the junction of the first cavity area 30a and the second cavity area 30b, and can limit the piston body 31. Moreover, the piston body 31 is provided with a clamping portion 311 on the side away from the first opening 101. In a specific implementation, the clamping portion 311 can include a cylindrical protrusion, and the limiting portion 304 includes a groove, a through hole or a gap that can be clamped and adapted with the cylindrical protrusion; or, the limiting portion 304 includes a cylindrical protrusion, and the clamping portion 311 includes a groove, a through hole or a gap that can be clamped and adapted with the cylindrical protrusion. Wherein, in the first linear direction, the interval distance L between the end surface of the limiting portion 304 for limiting the piston body 31 and the second opening 401 is greater than zero, so that the piston body 31 is always located in the first cavity area 30a, avoiding the piston body 31 from entering the second cavity area 30b to close the second opening 401 when switching to the first state. It can be seen that the clamping portion 311 and the limiting portion 304 constitute a movable buckle, and: in the first state, the piston body 31 is clamped and locked by the limiting portion 304, which can avoid the insufficient gas thrust caused by too much dust in the dust bucket, the right movement of the piston body 31, and the influence on the air intake, that is, to ensure that the air intake of the piston cavity 30 is not affected; in the second state, due to the opening of the air supplement port 60, the gas pressure in the second cavity area 30b changes, so that through the gas pressure change and the restoring force of the elastic member 32, the piston body 31 and the limiting portion 304 can be unlocked and separated, and move towards the first opening 101 and the transition cavity 20, so as to compress at least part of the gas in the first cavity area 30a into the transition cavity 20, to realize the reverse airflow impact on the filter 1, and realize self-cleaning.
[0083] Finally, it should be noted that the terms such as first and second in the present text are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed.
[0084] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between various embodiments can be referred to each other.
[0085] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A dust suction device comprising: a housing having an air inlet and an air outlet, and having a motor cavity, a filter cavity, and a piston cavity in the housing, the piston cavity being between the motor cavity and the filter cavity; a motor installed in the motor cavity, the motor being configured to generate a negative pressure to form an air flow passage between the air inlet and the air outlet; a filter installed in the filter cavity and located in the air flow passage, the filter being configured to filter dirt in the air flow; a piston body installed in the piston cavity, the piston body being configured to drive the air flow to reverse through the filter to clean the filter; characterized in that the housing further has a transition cavity between the filter cavity and the piston cavity, the transition cavity being arranged in a first linear direction with the piston cavity and in a second linear direction with the filter cavity, wherein the first linear direction and the second linear direction have an included angle.
2. The dust extraction device of claim 1, wherein, the transition cavity is provided with a first opening on a side close to the piston cavity, the first opening being in communication with the piston cavity; in a first state, the motor generates a negative pressure, the piston body is away from the first opening, and the transition cavity and the piston cavity are in communication to form part of the air flow passage; in a second state, the piston body moves towards the first opening to compress at least part of the gas in the piston cavity to enter the transition cavity through the first opening to clean the filter.
3. The dust extraction device of claim 2, wherein, the piston cavity is provided with a second opening on a side close to the motor cavity; a gap is left between the piston body and the piston cavity to communicate the first opening and the second opening.
4. The dust extraction device of claim 3, wherein, the piston cavity comprises: a first side wall provided with the first opening; a second side wall provided with the second opening; a third side wall between the first side wall and the second side wall, the third side wall comprising a flat area and a curved area, the flat area and the piston body being provided with the gap, and the curved area being provided with a groove recessed in a direction further away from the piston body relative to the flat area.
5. The dust extraction device of claim 4, wherein, an arc-shaped air guide surface is provided at a connection between the flat area and the curved area.
6. The dust extraction device of claim 3, wherein, a gas supplement valve is further included; the housing is provided with a gas supplement opening in communication with an air inlet of the motor and the second opening respectively; in the first state, the gas supplement valve closes the gas supplement opening; in the second state, the gas supplement valve opens the gas supplement opening.
7. The dust extraction device of claim 6, wherein, a resilient member is further included, in the first state, the piston body moves towards the second opening to cause the resilient member to compress and deform; in the second state, the resilient member is driven by a self-recovery force to move the piston body towards the first opening in cooperation with the gas supplement valve.
8. The dust extraction device of claim 2, wherein, a limiting part is provided on a side of the piston cavity close to the motor cavity; in the first state, the limiting part is engaged with the piston body; in the second state, the limiting part is disengaged from the piston body.
9. The dust extraction device of claim 8, wherein, the limiting part is protrudingly arranged in the piston cavity; a clamping part is provided on a side of the piston body away from the first opening; The clamping part comprises a cylindrical protrusion, and the limiting part comprises a groove, a through hole or a gap capable of being clamped and matched with the cylindrical protrusion; or the limiting part comprises a cylindrical protrusion, and the clamping part comprises a groove, a through hole or a gap capable of being clamped and matched with the cylindrical protrusion.
10. The dust extraction device of any one of claims 1 to 9, wherein, The included angle between the first straight line and the second straight line is 90°.