Self-cleaning device, dust removal system and road sweeper

Abstract

The application discloses a self-cleaning device, a dust removal system and a road sweeper. The self-cleaning device comprises a shell assembly, an inner shell assembly and a water spraying device. The shell assembly is provided with a negative pressure cavity and a gas suction port communicated with the negative pressure cavity. The inner shell assembly is sleeved in the shell assembly and is retractable along the axial direction of the shell assembly between a first position and a second position. The inner cavity of the inner shell assembly is communicated with the negative pressure cavity. The peripheral wall of the inner shell assembly is provided with filter screen holes. The filter screen holes are exposed outside the shell assembly when the inner shell assembly is in the first position. The inner shell assembly is retracted into the shell assembly relative to the first position when the inner shell assembly is in the second position. The water spraying device is connected with the shell assembly and the inner shell assembly respectively and sprays water to the inner shell assembly when the inner shell assembly moves from the first position to the second position, so as to clean the filter screen holes. The inner shell assembly of the self-cleaning device is retractable in the shell assembly. The filter screen holes of the inner shell assembly are washed by the water spraying device during the movement, so that the self-cleaning function is realized.

Description

Technical Field

[0001] This application relates to the field of waste disposal technology, and in particular to a self-cleaning device, a dust removal system having the self-cleaning device, and a road sweeper having the dust removal system. Background Technology

[0002] In related technologies, small and medium-sized sweepers are mainly divided into dry-type drum sweepers and wet-type box sweepers. Both dry-type and wet-type box sweepers suffer from difficult dust cleaning. In dry-type drum sweepers, when the vibrating plate rotates horizontally, it only causes a slight sway below the filter bag; the dust and debris adhering to the top of the filter bag cannot be removed and requires daily manual cleaning. Otherwise, blockage in the dust collection box will severely reduce the sweeper's suction power, wasting time and effort. Wet-type box sweepers typically lack a separate dust cleaning mechanism in the garbage bin, and the space is narrow, making manual operation difficult. When the air outlet is blocked, the garbage becomes extremely difficult to clean. Summary of the Invention

[0003] One objective of this application is to provide a self-cleaning device that achieves self-cleaning function by providing an inner shell assembly, an outer shell assembly, and a water spraying device.

[0004] Another objective of this application is to provide a dust removal system, including the aforementioned self-cleaning device.

[0005] Another object of this application is to provide a road sweeper that includes the aforementioned dust removal system.

[0006] A self-cleaning device according to an embodiment of this application includes a housing assembly, an inner housing assembly, and a water spraying device. The housing assembly has a negative pressure chamber and an air extraction port communicating with the negative pressure chamber. The inner housing assembly is sleeved inside the housing assembly and is extendable and retractable along the axial direction of the housing assembly between a first position and a second position. The inner cavity of the inner housing assembly communicates with the negative pressure chamber. A filter screen is provided on the peripheral wall of the inner housing assembly, communicating with the inner cavity of the inner housing assembly. When the inner housing assembly is in the first position, the filter screen is exposed in the housing assembly to filter the airflow leading to the air extraction port. When the inner housing assembly is in the second position, it retracts into the housing assembly relative to the first position. The water spraying device is connected to the housing assembly and the inner housing assembly respectively, and sprays water onto the inner housing assembly when the inner housing assembly moves from the first position to the second position to clean the filter screen.

[0007] According to the self-cleaning device of this application embodiment, the inner shell assembly is retractable and movable within the outer shell assembly. During the movement, a water spray device cleans the filter mesh of the inner shell assembly, thereby achieving the self-cleaning function.

[0008] In addition, the self-cleaning device according to the above embodiments of this application may also have the following additional technical features:

[0009] Optionally, the water spraying device includes a water storage shell, a piston, and a water spraying element. The water storage shell is fixedly connected to the outer shell assembly and has a water inlet. The piston is movably disposed within the water storage shell along the axial direction and defines a water storage cavity communicating with the water inlet within the water storage shell. The piston is fixedly connected to the inner shell assembly. The water spraying element communicates with the water storage cavity and is adapted to spray water toward the inner shell assembly to clean the inner shell assembly.

[0010] Optionally, the water spray component further includes a water spray frame and a nozzle. The water spray frame is fixedly connected to the outer periphery of the outer shell assembly. The water spray frame has a water flow channel that communicates with the water storage chamber. The nozzle is connected to the water spray frame and communicates with the water flow channel, and the nozzle is opposite to the inner shell assembly.

[0011] Optionally, the water spray component further includes a connecting frame and a hose. One end of the connecting frame is fitted inside the water storage shell and connected to the piston, while the other end is fixedly connected to the inner shell assembly. A water passage is formed inside the connecting frame that communicates with the water storage chamber. The hose is located outside the outer shell assembly, with one end of the hose connected to the other end of the connecting frame and communicating with the water passage. The other end of the hose is connected to the water spray frame and communicating with the water flow channel.

[0012] Optionally, a portion of the peripheral wall of the outer shell assembly protrudes outward to form a clearance protrusion spaced at a predetermined distance from the inner shell assembly. The water spray is mounted on the outside of the outer shell assembly and arranged around the clearance protrusion. The clearance protrusion has a clearance port for the nozzle to spray water toward the inner shell assembly located inside the outer shell assembly.

[0013] Optionally, the self-cleaning device further includes a damping element configured to apply an elastic thrust to the inner shell assembly to move the inner shell assembly toward the first position.

[0014] Optionally, the self-cleaning device further includes a water inlet pipe and a one-way valve, the one-way valve being connected between the water inlet pipe and the water inlet, and the one-way valve being configured to allow one-way flow from the water inlet pipe to the water inlet.

[0015] Optionally, the outer shell assembly includes a first cylindrical body and an end plate, the end plate being disposed at one end of the first cylindrical body and the other end of the first cylindrical body being open, the air extraction port being disposed on the end plate, the inner shell assembly being sleeved inside the first cylindrical body, and the inner shell assembly extending from the other end of the first cylindrical body at the first position.

[0016] Optionally, the inner shell assembly includes a second cylinder, a filter screen, and a pressure valve. The second cylinder is fitted inside the first cylinder, and one end of the first cylinder near the end plate is open. The filter screen is located on the first cylinder at the end away from the end plate. The pressure valve is located inside the filter screen and closes the filter screen. When the inner shell assembly is in the second position, the pressure valve is open, and the filter screen holes are located on the second cylinder at the end adjacent to the filter screen.

[0017] Optionally, the inner shell assembly is provided with a roller, and the inner circumferential surface of the outer shell assembly is provided with a sliding groove that rolls with the roller. The sliding groove extends along the axial direction of the outer shell assembly, and the roller rolls along the sliding groove when the inner shell assembly moves between the first position and the second position.

[0018] Optionally, the inner shell assembly includes a second cylinder, a mounting bracket, and a connecting bracket. The second cylinder has a notch on its peripheral wall. The mounting bracket is located inside the second cylinder and is fixedly connected to it. The mounting bracket is U-shaped with its opening facing the notch. The first end of the connecting bracket is connected to the mounting bracket, and the second end extends downward toward the notch. The roller is rotatably connected to the second end of the connecting bracket. A portion of the roller is located inside the second cylinder, and another portion extends through the notch to the outer peripheral surface of the second cylinder. The peripheral wall of the second cylinder has multiple notches, and these multiple notches are arranged circumferentially along the second cylinder.

[0019] Optionally, at least one of the top and bottom of the chute is provided with a roller limiting structure for limiting the inner shell assembly.

[0020] The dust removal system according to an embodiment of this application includes: a dust collection bin, a housing, a suction nozzle device, and a water spraying device and an air extraction device as described above. The housing covers the dust collection bin, and the housing is provided with an air inlet. The suction nozzle device is connected to the housing and communicates with the air inlet. A self-cleaning device is disposed in the housing and connected to the housing. The air extraction device is connected to the housing and communicates with the air extraction port. The air extraction device drives airflow from the suction nozzle device into the housing and the dust collection bin, and after being filtered through the filter mesh, it is discharged from the air extraction device.

[0021] Additional aspects and advantages of this application will be set forth in the description which follows, and in some respects will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a self-cleaning device according to an embodiment of this application.

[0023] Figure 2 This is an exploded schematic diagram of a self-cleaning device according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the housing assembly of the self-cleaning device according to an embodiment of this application.

[0025] Figure 4 This is an exploded view of a self-cleaning device according to an embodiment of this application, in which the inner shell assembly and the outer shell assembly are hidden.

[0026] Figure 5 This is a schematic diagram of the housing assembly and water spraying device of the self-cleaning device according to an embodiment of this application.

[0027] Figure 6 This is a schematic diagram of the inner shell assembly of the self-cleaning device according to an embodiment of this application.

[0028] Figure 7 This is a schematic diagram of the inner shell assembly of the self-cleaning device according to an embodiment of this application.

[0029] Figure 8 This is an exploded view of the inner shell assembly of the self-cleaning device according to an embodiment of this application.

[0030] Figure 9 yes Figure 8 A magnified view of a portion of region A in the middle circle.

[0031] Figure 10 This is an exploded schematic diagram of the water spray device of the self-cleaning device according to an embodiment of this application.

[0032] Figure 11 This is a schematic diagram of the self-cleaning device in a first position according to an embodiment of this application.

[0033] Figure 12 This is a schematic diagram showing the direction of movement of the self-cleaning device from the first position to the second position according to an embodiment of this application.

[0034] Figure 13 This is a schematic diagram of the self-cleaning device of an embodiment of this application in a second position.

[0035] Figure 14 This is a schematic diagram of the self-cleaning device in a second position according to an embodiment of this application, wherein the pressure valve is open.

[0036] Figure 15 This is a schematic diagram of the housing of a dust removal system according to an embodiment of this application.

[0037] Figure 16 This is a schematic diagram of the housing and self-cleaning device of the dust removal system according to an embodiment of this application.

[0038] Figure 17This is a schematic diagram of a road sweeper according to an embodiment of this application.

[0039] Figure 18 This is a schematic diagram of the airflow direction of the sweeper according to an embodiment of this application.

[0040] Figure 19 This is a schematic diagram of the open state of the sweeper housing according to an embodiment of this application.

[0041] Figure 20 This is a schematic diagram from another direction showing the open state of the sweeper housing in an embodiment of this application.

[0042] Figure label:

[0043] Self-cleaning device 100, outer shell assembly 10, negative pressure chamber 11, air extraction port 12, first cylinder 13, end plate 14, slide groove 15, inner shell assembly 20, filter screen 21, second cylinder 22, filter screen 23, roller 24, pressure valve 26, mounting bracket 27, connecting bracket 28, water spraying device 30, scraper ring 31, sweeping ring 32, fixing ring 321, brush 322, pressure ring 34, water storage shell 40, water inlet 51, piston 52, damping component 53, water spraying component 54, connecting bracket 54a, hose 54b, water spraying frame 55, nozzle 56, water inlet pipe 57, one-way valve 58, filter 59, dust collection bin 200, box 300, air inlet 301, suction device 400, air extraction device 500, road sweeper 1000. Detailed Implementation

[0044] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0045] Reference Figure 1 , Figure 2 , Figures 13 to 14This application provides a self-cleaning device 100, which includes a housing assembly 10, an inner housing assembly 20, and a water spraying device 30. The housing assembly 10 has a negative pressure chamber 11 and an air extraction port 12 communicating with the negative pressure chamber 11. Air extraction through the air extraction port 12 can generate negative pressure inside the housing assembly 10. The inner housing assembly 20 is sleeved inside the housing assembly 10 and is extendable and retractable along the axial direction of the housing assembly 10 between a first position and a second position. The inner cavity of the inner housing assembly 20 is connected to the negative pressure chamber 11. The inner shell assembly 20 has filter mesh holes 21 on its peripheral wall that communicate with the inner cavity of the inner shell assembly 20. When the inner shell assembly 20 is in the first position, the filter mesh holes 21 are exposed outside the outer shell assembly 10 to filter the airflow leading to the air intake port 12. When the inner shell assembly 20 is in the second position, it retracts into the outer shell assembly 10 relative to the first position. The water spraying device 30 is connected to both the outer shell assembly 10 and the inner shell assembly 20, and sprays water onto the inner shell assembly 20 as it moves from the first position to the second position to clean the filter mesh holes. Therefore, when the inner shell assembly 20 moves from the first position to the second position, the water spraying device 30 can complete the rinsing of the inner shell assembly 20, realizing the self-cleaning function of the self-cleaning device 100.

[0046] In the second position, the inner shell assembly 20 retracts into the outer shell assembly 10 relative to the first position. In other words, when the inner shell assembly 20 is in the first position, the filter mesh 21 on the inner shell assembly 20 can be exposed to the outer shell assembly 10 so that airflow can pass through the filter mesh 21. When the inner shell assembly 20 moves from the first position to the second position, the inner shell assembly 20 can gradually retract into the outer shell assembly 10, that is, the portion of the filter mesh 21 that can be exposed to the outer shell assembly 10 gradually decreases.

[0047] Specifically, the inner shell assembly 20 is fitted inside the outer shell assembly 10 and can extend and retract within the outer shell assembly 10. The inner cavity of the inner shell assembly 20 is connected to the negative pressure chamber 11. The water spray device 30 can rinse the filter screen 21 when the inner shell assembly 20 moves from the first position to the second position. When the inner shell assembly 20 is in the first position, the filter mesh 21 of the inner shell assembly 20 is exposed to the outer shell assembly 10 to filter the airflow leading to the air intake 12, so that the filtered air flows out from the air intake 12. As the filter mesh 21 continues to filter the airflow, dust or debris adheres to the filter mesh 21. The air intake 12 draws air, creating a negative pressure inside the outer shell assembly 10. When the filter mesh 21 is completely or nearly completely blocked, the negative pressure of the outer shell assembly 10 continues to rise to its maximum. When the negative pressure value rises to a certain value, the inner shell assembly 20 is attracted to rise and moves from the first position to the second position. During the rising process of the inner shell assembly 20, the water spray device 30 can rinse the filter mesh 21 when the inner shell assembly 20 moves from the first position to the second position, realizing the automatic cleaning of the self-cleaning device 100 when debris blockage occurs.

[0048] According to the self-cleaning device 100 of this application embodiment, the inner shell assembly 20 is retractable and movable within the outer shell assembly 10. During the movement, the filter mesh 21 of the inner shell assembly 20 is rinsed by the water spray device 30, thereby realizing the self-cleaning function, improving the convenience of maintenance of the self-spraying device 30, and effectively improving work efficiency.

[0049] When the inner shell assembly 20 moves from the first position to the second position, the water spray device 30 can rinse the filter mesh 21. After the peripheral wall of the filter mesh 21 is cleaned, the airflow re-enters the filter mesh 21, the internal and external pressure difference of the self-cleaning device 100 is balanced, and the inner shell assembly 20 can automatically fall back to the second position. Of course, the self-cleaning device 100 may also include a damping element 53, which can apply an elastic thrust to the inner shell assembly 20 when it moves to the first position.

[0050] Reference Figures 11 to 14 In some embodiments of this application, the self-cleaning device 100 may include a damping element 53, which may be connected to the inner shell assembly 20 and the outer shell assembly 10 respectively, and apply an elastic thrust to the inner shell assembly 20 to push it to move to the first position. It can be understood that when dust removal causes debris to clog the filter mesh 21, the inner shell assembly 20 is attracted upwards due to the increased negative pressure in the negative pressure chamber 11. During the upward movement, the water spray device 30 can rinse the filter mesh 21 on the peripheral wall of the inner shell assembly 20. At this time, the compressible damping element 53 moves upwards. When the filter mesh 21 is cleaned, the airflow re-enters the negative pressure chamber 11 from the filter mesh 21, balancing the internal and external pressure difference of the self-cleaning device 100. Then, under the restoring force of the damping element 53, the inner shell assembly 20 can quickly fall, allowing the self-cleaning device 100 to quickly return from the second position to the first position, thus improving the operating efficiency of the self-cleaning device 100.

[0051] Reference Figures 1 to 4In some embodiments of this application, the water spraying device 30 may further include a water storage shell 40, a piston 52, and a water spraying element 54. The water storage shell 40 has a water inlet 51 and can be fixedly connected to the outer shell assembly 10. The piston 52 is axially movably disposed within the water storage shell 40, defining a water storage cavity communicating with the water inlet 51 within the water storage shell 40. The piston 52 and the inner shell assembly 20 are fixedly connected. The water spraying element 54 communicates with the water storage cavity and is adapted to spray water toward the inner shell assembly 20 to clean the inner shell assembly 20. For example, when the inner shell assembly 20 rises, the piston 52 can be driven to move upward, compressing the damping element 53, forcing water out of the water storage cavity, which is then sprayed out by the water spraying element 54. After cleaning the filter mesh 21, the water spraying element 54 further cleans the inner shell assembly 20. By setting up a water storage shell 40, a piston 52, and a water spray component 54, the self-cleaning device 100 can be further cleaned to improve its self-cleaning ability. Furthermore, the water storage shell 40 and the inner shell assembly 20 share the same power source for their rise, thus reducing energy consumption.

[0052] Furthermore, the water spraying device 30 may also include a spray frame 55 and a nozzle 56. The spray frame 55 is fixedly connected to the outer periphery of the outer casing assembly 10, and the spray frame 55 has a water flow channel that communicates with the water storage chamber. The nozzle 56 is connected to the spray frame 55 and communicates with the water flow channel, and the nozzle 56 is opposite to the inner casing assembly 20. When the inner casing assembly 20 is in the second position, the nozzle 56 is opposite to the holes of the filter screen 23. By fixing the spray frame 55 to the outer periphery of the outer casing assembly 10 and setting the nozzle 56 on the spray frame 55, when the inner casing assembly 20 is attracted to rise to the second position due to negative pressure, it will drive the piston 52 to move upward, compress the damping member 53, and force the water in the water storage tank 40 to the spray frame 55 fixed to the outer periphery of the outer casing assembly 10, and spray it out from the nozzle 56, so that the cleaned filter screen holes 21 are further rinsed, ensuring the permeability of the filter screen holes 21, and further improving the self-cleaning capability of the self-cleaning device 100.

[0053] The self-cleaning device 100 may further include a water inlet pipe 57 and a one-way valve 58. The one-way valve 58 is connected between the water inlet pipe 57 and the water inlet 51, and is configured to allow one-way flow from the water inlet pipe 57 to the water inlet 51. By providing the one-way valve 58 between the water inlet pipe 57 and the water inlet 51, water entering from the water inlet pipe 57 can only flow to the water inlet 51 and cannot flow out, so that the water flow can flush the filter screen 21 of the inner shell assembly 20 and prevent water from flowing back out. Understandably, the self-cleaning device 100 can be applied to a sweeper 1000 or a vacuum cleaner. For example, when applied to a sweeper 1000, the sweeper 1000 can be equipped with a garbage collection bin 200. The water inlet pipe 57 absorbs the wastewater in the collection bin 200. A filter 59 can be installed on the water inlet pipe 57 to filter the wastewater sucked in by the water inlet pipe 57. By setting a one-way valve 58, the filtered water can be drawn in one direction to the spray pipe and atomized and sprayed out through the nozzle 56. There is no need to set up an additional clean water tank. It shares the same power source as the inner shell assembly 20, so it does not need to rely on an additional power source, reducing energy consumption. Furthermore, water is saved by reusing wastewater. When the water storage tank 40 rises with the inner shell assembly 20, the water in the water storage tank 40 is forced into the spray frame 55 and atomized through the nozzle 56 to further clean the surface of the filter mesh 21. As the inner shell assembly 20 falls, the wastewater in the dust collection bin 200 is filtered by the filter 59 and then re-inhaled into the water storage shell 40 for storage, to be used next time. The piston 52 and the water storage shell 40 form a sealed space. Through the damping element 53, the water storage shell 40 can quickly return to its original position and absorb water after being compressed and drained.

[0054] Reference Figures 1 to 4 In some embodiments of this application, the water spray component 54 further includes a connecting frame 54a and a hose 54b. One end of the connecting frame 54a is fitted inside the water storage shell 40 and connected to the piston 52, while the other end is fixedly connected to the inner shell assembly 20. A water passage communicating with the water storage chamber is constructed inside the connecting frame 54a. The hose 54b is located outside the outer shell assembly 10, with one end connected to the other end of the connecting frame 54a and communicating with the water passage. The other end of the hose 54b is connected to the water spray frame 55 and communicating with the water flow channel. This arrangement allows the water spray frame 55 to communicate with the water storage chamber, so that the water spray device 30 can rinse the filter mesh 21 and realize the self-cleaning function of the self-cleaning device 100.

[0055] Specifically, when the filter mesh 21 is completely or nearly completely blocked, the negative pressure of the outer shell assembly 10 continues to rise to its maximum. When the negative pressure value rises to a predetermined value, the inner shell assembly 20 can be attracted and raised, and can move from the first position to the second position. During this process, the piston 52 is fixedly connected to the inner shell assembly 20. Therefore, the inner shell assembly 20 can drive the piston 52 to rise, thereby forcing the water in the water storage chamber out. Since the connecting frame 54a and the hose 54b are connected in sequence between the water storage chamber and the spray frame 55, the water storage chamber can be connected to the water flow channel in the spray frame 55. Finally, under the pressure of the piston 52, the water in the water storage chamber can pass through the water passage, the hose 54b and the water flow channel in sequence, and be sprayed out from the nozzle 56 to achieve the rinsing of the filter mesh 21.

[0056] Reference Figures 1 to 3 In some embodiments of this application, a portion of the peripheral wall of the outer shell assembly 10 protrudes outward to form a clearance protrusion spaced a predetermined distance from the inner shell assembly 20. A water spray frame 55 is disposed on the outer side of the outer shell assembly 10 and surrounds the clearance protrusion. The clearance protrusion has a clearance opening for a nozzle 56 to spray water toward the inner shell assembly 20 located inside the outer shell assembly 10. This arrangement allows for rinsing of the inner shell assembly 20, which extends and retracts within the outer shell assembly 10, thereby achieving the self-cleaning function of the self-cleaning device 100.

[0057] Among them, multiple nozzles 56 can be arranged at intervals along the circumference of the spray frame 55. Correspondingly, multiple nozzles can also be arranged at intervals along the circumference of the spray frame 55 on the relief protrusion, so as to rinse the filter mesh 21 in multiple directions and improve the cleaning degree of the inner shell assembly 20.

[0058] When the inner shell assembly 20 moves from the first position to the second position, the piston 52 is fixedly connected to the inner shell assembly 20. Therefore, the piston 52 can press out the water in the water storage chamber. The water flow can pass through the water storage chamber, the connecting frame 54a, the hose 54b and the spray frame 55 in sequence, and finally be sprayed out from the nozzle 56. The outer shell assembly 10 has a relief port corresponding to the nozzle 56 on the relief protrusion. Therefore, the water mist sprayed by the nozzle 56 can enter the interior of the outer shell assembly 10 through the relief port and rinse the inner shell assembly 20 moving inside the outer shell assembly 10, especially rinsing the filter screen 21 on the inner shell assembly 20, so as to realize the self-cleaning function of the self-cleaning device 100.

[0059] In addition, a clearance protrusion is provided on the outer shell assembly 10, which allows a certain clearance space between the outer shell assembly 10 and the inner shell assembly 20, preventing the inner shell assembly 20 from moving between the first position and the second position and colliding with the outer shell assembly 10, thus preventing damage to the self-cleaning device 100.

[0060] Reference Figure 5In some embodiments of this application, the self-cleaning device 100 further includes a damping element 53, which is configured to apply an elastic thrust to the inner shell assembly 20 to move the inner shell assembly 20 to a first position. Therefore, the inner shell assembly 20 can be driven to move from a second position to a first position, thereby improving the operating efficiency of the self-cleaning device 100.

[0061] When the filter mesh 21 is completely or nearly completely blocked, the negative pressure of the outer shell assembly 10 continues to rise to its maximum. When the negative pressure value rises to a predetermined value, the inner shell assembly 20 can be attracted and raised, and moved from the first position to the second position. During this process, the piston 52 discharges water from the water storage chamber. The water flow can pass through the water storage chamber, the connecting frame 54a, the hose 54b and the spray frame 55 in sequence, and finally spray out from the nozzle 56. In conjunction with the aforementioned embodiment, the outer shell assembly 10 is provided with a clearance port for the nozzle 56 to spray water towards the inside of the outer shell assembly 10. Therefore, the water flow sprayed by the nozzle 56 can directly rinse the inner shell assembly 20 inside the outer shell assembly 10, realizing the self-cleaning function of the self-cleaning device 100.

[0062] Subsequently, after the periphery of the filter mesh 21 is rinsed clean, the airflow can re-enter through the filter mesh 21, the internal and external pressure difference of the self-cleaning device 100 is balanced, and under the elastic thrust and gravity of the damping element 53 on the inner shell assembly 20, the inner shell assembly 20 can move from the second position to the first position. At this time, a negative pressure can be generated in the water storage chamber to draw in the wastewater in the dust collection bin, and a filter can be placed on the water inlet pipe. Thus, the wastewater used to clean the inner shell assembly 20 or the filter mesh 21 can be reused to save water.

[0063] Secondly, the damping element 53 can be a spring, one end of which can be connected to the piston 52, and the other end can be connected to the water storage shell 40. When the filter mesh 21 is completely or nearly completely blocked, the negative pressure of the outer shell assembly 10 continues to rise to its maximum. When the negative pressure value rises to a predetermined value, the piston 52 can move upward along the inside of the water storage shell 40. That is, the piston 52 is attracted to rise. During the rising process, the inner shell assembly 20 cleans the filter mesh 21 through the water spray device 30, allowing the airflow to pass through the filter mesh 21 again, so that the internal and external pressure difference of the self-cleaning device 100 is balanced. At this time, the spring has an elastic thrust to push the piston 52, causing the inner shell assembly 20 connected to the piston 52 to move from the second position to the first position, thereby improving the cleaning efficiency of the self-cleaning device 100.

[0064] Reference Figure 3 and Figure 5In some embodiments of this application, the outer shell assembly 10 may include a first cylindrical body 13 and an end plate 14. The end plate 14 is disposed at one end of the first cylindrical body 13, and the air extraction port 12 is disposed on the end plate 14. The other end of the first cylindrical body 13 is open so that the inner shell assembly 20 is fitted inside the first cylindrical body 13. When the inner shell assembly 20 is in the first position, it extends from the other end of the first cylindrical body 13. The extended part is a filter mesh 21 so that when the inner shell assembly 20 is in the first position, it filters the airflow leading to the air extraction port 12.

[0065] Reference Figure 6 and Figure 7 Furthermore, the inner shell assembly 20 may include a second cylinder 22, a filter screen 23, and a pressure valve 26. The second cylinder 22 is fitted inside the first cylinder 13. One end of the first cylinder 13 near the end plate 14 is open, allowing airflow to be drawn out from the exhaust port 12. The filter screen 23 is located at the end of the first cylinder 13 away from the end plate 14. The filter screen 23 can be used for ventilation filtration, and the pore size of the filter screen 23 can be large or small. The pressure valve 26 is located inside the filter screen 23 and seals the filter screen 23. Figure 11 When the inner shell assembly 20 is in the first position, the pressure valve 26 is closed, and the filter mesh 21 is located on the second cylinder 22 near the end of the filter screen 23. When the inner shell assembly 20 is in the first position, the filter mesh 21 filters the airflow leading to the exhaust port 12. Figure 12 When the filter mesh 21 is clogged, the negative pressure in the negative pressure chamber 11 rises, and the inner shell assembly 20 is drawn upward. For example... Figure 13 and Figure 14 When the inner shell assembly 20 rises to the second position, the negative pressure in the negative pressure chamber 11 increases to its maximum, and the pressure valve 26 opens. The pressure valve 26 may have two semi-circular valves, which open upwards. Airflow enters the negative pressure chamber 11 through the filter screen 23, balancing the pressure difference inside and outside the self-cleaning device 100. Under the elastic thrust of the damping element 53, the inner shell assembly 20 quickly falls back to the first position, and the airflow re-enters the exhaust port 12 through the filter screen 21 of the inner shell assembly 20. The pressure valve 26 then closes. By setting the pressure valve 26 and cooperating with the filter screen 23, the inner shell assembly 20 can quickly return from the second position to the first position after completing the self-cleaning process, thereby improving the working efficiency of the self-cleaning device 100.

[0066] Reference Figure 3 and Figure 6In some embodiments of this application, the inner shell assembly 20 is fitted inside the outer shell assembly 10 and is telescopically extendable along the axial direction of the outer shell assembly 10 at a first position and a second position. The inner shell assembly 20 may be provided with rollers 24, and the inner circumferential surface of the outer shell assembly 10 may be provided with a sliding groove 15 that rolls with the rollers 24. The sliding groove 15 extends along the axial direction of the outer shell assembly 10, and the rollers 24 roll along the sliding groove 15 when the inner shell assembly 20 moves between the first and second positions. By configuring the rollers 24 and the sliding groove 15 to cooperate, the movement of the inner shell assembly 20 at the first and second positions is smoother, thereby effectively cleaning the filter mesh 21. The roller 24 can be a tensioning roller, which may be supported by an elastic mechanism (such as a spring) to allow the roller 24 to be pushed outward. The roller 24 can be fixed to the inner shell assembly 20 with screws. The roller 24 rolls in the slide groove 15. Due to the support of the elastic mechanism, it has a certain preload, so that the entire inner shell assembly 20 will not vibrate or shake due to the shaking of the self-cleaning device 100 during use, which can increase the stability of the self-cleaning device 100 during operation.

[0067] Reference Figures 6 to 9 Furthermore, the inner shell assembly 20 may include a second cylindrical body 22, a mounting bracket 27, and a connecting bracket 28. The second cylindrical body 22 has a notch on its peripheral wall. The mounting bracket 27 is located inside the second cylindrical body 22 and is fixedly connected to it. The mounting bracket 27 is U-shaped with its opening facing the notch. The first end of the connecting bracket 28 is connected to the mounting bracket 27, and the second end extends downwards towards the notch. A roller 24 is rotatably connected to the second end of the connecting bracket 28. A portion of the roller 24 is located inside the second cylindrical body 22, and another portion extends through the notch outwards from the outer peripheral surface of the second cylindrical body 22 to allow for vertical movement within the outer shell assembly 10. The peripheral wall of the second cylindrical body 22 has multiple notches arranged circumferentially around the second cylindrical body 22, with the number of notches corresponding to the number of rollers 24. The rollers 24 can be two, three, four, or other numbers, preferably four, to ensure stable vertical movement of the inner shell assembly 20 within the outer shell assembly 10. By setting a mounting bracket 27 on the peripheral wall of the inner shell assembly 20 and connecting the roller 24 through a connecting bracket 28, and setting a notch on the inner shell assembly 20, the roller 24 is embedded in the inner shell assembly 20. In conjunction with the sliding groove 15 of the outer shell assembly 10, the sliding groove 15 can guide the inner shell assembly 20 to extend and retract vertically, so that the inner shell assembly 20 can move stably between the first position and the second position to complete the self-cleaning of the inner shell assembly 20 and ensure the working stability of the self-cleaning device 100.

[0068] At least one of the top and bottom of the slide 15 may be provided with a roller 24 limiting structure for limiting the inner shell assembly 20. When the inner shell assembly 20 is in the first position and the second position, the limiting structure can limit the inner shell assembly 20 to prevent the inner shell assembly 20 from detaching from the outer shell assembly 10 when it moves within the outer shell assembly 10.

[0069] Reference Figure 5 and Figure 10 In some embodiments of this application, the self-cleaning device 100 may include a scraping ring 31. The scraping ring 31 extends circumferentially along the outer shell assembly 10. The outer periphery of the scraping ring 31 is fixedly connected to the outer shell assembly 10, and the inner periphery of the scraping ring 31 abuts against the outer periphery of the inner shell assembly 20. When the inner shell assembly 20 moves between a first position and a second position, the inner periphery of the scraping ring 31 moves along the outer periphery of the inner shell assembly 20 to clean the filter mesh 21. The scraping ring 31 is fixedly connected to the outer shell assembly 10, which can be done by screws, or by fitting a pressure ring 34 onto the scraping ring 31 and tightening it with screws to ensure the stability of the scraping ring 31 after installation and to prevent the scraping ring 31 from falling off during the up-and-down movement of the inner shell assembly 20. The outer periphery of the scraping ring 31 is fixed to the outer shell assembly 10, and the inner periphery is attached to the outer periphery of the inner shell assembly 20, so as to scrape off the dust or debris on the surface of the filter mesh 21 of the inner shell assembly 20 when the inner shell assembly 20 moves between the first position and the first position.

[0070] Furthermore, the self-cleaning device 100 may also include a cleaning ring 32, which extends circumferentially along the outer casing assembly 10. The cleaning ring 32 includes a fixing ring 321 and a brush 322 disposed on the fixing ring 321. The fixing ring 321 is fixedly connected to the outer casing assembly 10, and the brush 322 is disposed on the fixing ring 321 and abuts against the outer peripheral surface of the inner casing assembly 20. When the inner casing assembly 20 moves between a first position and a second position, the brush 322 moves along the outer peripheral surface of the inner casing assembly 20 to clean the filter mesh 21. By providing the brush 322 on the cleaning ring 32, the dust in the filter mesh 21 can be further cleaned to ensure the self-cleaning effect. During the upward movement of the inner shell assembly 20, the surface of the filter mesh 21 is first scraped off by the scraping ring 31, and then the brush 322 of the washing ring 32 cleans the firmly attached or fine dust on the filter mesh 21, so that the filter mesh 21 is thoroughly cleaned and the self-cleaning effect of the self-cleaning device 100 is improved.

[0071] Referring to this application, a dust removal system is provided, which may include a dust collection bin 200, a housing 300, a suction nozzle device 400, the aforementioned self-cleaning device 100, and an air extraction device 500. The housing 300 covers the dust collection bin 200 and has an air inlet 301. The suction nozzle device 400 is connected to the housing 300 and communicates with the air inlet 301. The self-cleaning device 100 is disposed within and connected to the housing 300. The air extraction device 500 is connected to the housing 300 and communicates with an air extraction port 12. The air extraction device 500 drives airflow from the suction nozzle device 400 into the housing 300 and the dust collection bin 200, and after being filtered through the filter mesh 21, it is discharged from the air extraction device 500. A sealing gasket may be provided on the housing 300, and the gasket is fixed to the housing 300 with screws to ensure the airtightness of the housing 300. So that when the air extraction device 500 extracts air, negative pressure is generated inside the self-cleaning device 100.

[0072] Reference Figures 15 to 20 The housing 300 is constructed by welding together a front side panel, a right side panel, a left side panel, a rear side panel, and a bottom support plate. A top cover plate is installed on top of this frame. Nuts are welded to the mounting holes, and left and right sealing gaskets and front and rear sealing gaskets are used to fill the mating surfaces with the top cover plate. Screws and washers are used for tightening to ensure a tight seal. A sealing gasket is placed on top of the top cover plate to mate with the bottom of the fan, ensuring a tight seal. An air inlet pipe is installed at the front of the housing 300, secured with screws and washers, and is removable for easy cleaning of any blockages. A garbage can sealing gasket can be attached to the bottom of the housing 300 frame using AB glue. A hinge pin support can be welded to the upper part of the front panel of the housing 300, secured using a straight-neck grease fitting, bolts, and the hinge pin. Gas spring supports are welded to the outer sides of both the right and left panels of the housing 300, and anti-loosening nuts are used to install and secure the gas springs. This allows the housing 300 to rotate around the hinge pin under manual force, exerting downward pressure to ensure the housing 300 completely presses down on the dust collection bin 200, guaranteeing airtightness. Elastic hooks are screwed to the outer sides of the right and left panels of the housing 300. These hooks are used to pull downwards after the housing 300 presses down on the dust collection bin 200, hooking onto the bin to prevent the housing 300 assembly from rotating upwards and opening due to impacts when the sweeper 1000 travels on uneven roads. This allows the housing 300 to be manually lifted and rotated around the hinge pin, enabling manual tilting and facilitating maintenance. Compared to traditional fixed dust collection boxes, it is easier to clean the garbage inside the box 300, which facilitates the maintenance of the dust collection bin 200. It solves the problem of the garbage bin falling due to hydraulic cylinder contraction caused by valve leakage in traditional garbage bin lifting solutions, and also solves the problem of garbage bins easily deforming under excessive force.

[0073] Reference Figure 18The dust removal system can be applied to the sweeper 1000 or other dust collection and cleaning equipment. Taking the sweeper 1000 as an example, the sweeper 1000 is suitable for operation on dry roads, roads with standing water, or rainy days. The suction nozzle device 400 can be equipped with a dust suppression spray nozzle 56. When the sweeper 1000 is working, garbage and water enter from the front end of the suction nozzle device 400 with the air. Guided by the suction pipe of the suction nozzle device 400, they enter the housing 300. Water and garbage fall into the bottom of the dust collection bin 200 after impacting the outer wall of the self-cleaning device 100. Some light garbage rises with the airflow and is filtered by the filter screen 23 of the self-cleaning device 100. Clean air is discharged through the exhaust device 500. As the sweeper 1000 continues to work, a large amount of light debris and dust gradually accumulates on the filter mesh 21 of the inner shell assembly 20. When the filter mesh 21 is not completely blocked, the sweeper 1000 can still work normally, but the negative pressure in the suction device 400 decreases, while the negative pressure in the self-cleaning device 100 increases. As the filter mesh 21 is completely or almost completely blocked, the negative pressure in the self-cleaning device 100 will continue to rise to its maximum. When the negative pressure value rises to a certain value, the inner shell assembly 20 will be attracted upward. During the upward movement, the light debris and dust adsorbed on the filter mesh 21 are pushed downward by the scraper ring 31, causing them to detach. Meanwhile, the more firmly attached or finer dust will continue to fall off as the inner shell assembly 20 rises, due to the cleaning action of the bristles on the sweeping ring 32. Simultaneously, the rise of the inner shell assembly 20 will cause the water pump base in the water storage shell 40 to move upward, compressing the damping element 53 and pushing the piston 52 upward, forcing water out of the pump. This water is then atomized and sprayed out from the nozzle 56 through the spray frame 55, further rinsing the dirt cleaned by the scraper ring 31 in the inner shell assembly 20 and ensuring the permeability of the filter screen 23. When the inner shell assembly 20 rises to its highest point, as the negative pressure in the cavity increases to its maximum, the pressure valve 26 opens, and the airflow can enter the cavity through the filter mesh 21 and the filter screen 23. A small amount of light, airborne debris is blocked by the filter screen 23. Due to the pressure difference balance between the box 300 and the self-cleaning device 100, and the elastic thrust of the damping element 53, the inner shell assembly 20 will quickly fall until the first airflow re-enters the suction device 500 through the filter mesh 21 of the inner shell assembly 20, and the pressure valve 26 closes. The water storage tank 40, which falls together with the inner shell assembly 20, drives the piston 52 to fall, creating negative pressure inside the water storage tank 40 and producing a water suction effect. The wastewater in the dust collection bin 200 is turned into clean water by the filter 59, and enters the water storage tank 40 through the inlet pipe 57 and the one-way valve 58 for the next use.Multiple actions rely on the internal negative pressure generated by the self-cleaning device 100's blockage, coupled with a mechanical structure, requiring no additional power source. This automated, real-time linkage reduces maintenance steps during the operation of the sweeper 1000, lowering maintenance difficulty and requirements. Furthermore, its compact structure makes efficient use of the internal space of the housing 300, facilitating structural optimization, reducing production costs, improving operational efficiency, and minimizing manual labor requirements. The self-cleaning device 100 automatically cleans itself, extending the lifespan of the filter components and reducing the frequency of subsequent manual replacement and maintenance.

[0074] Reference Figures 19 to 20 When the dust collection bin 200 needs to be replaced, first remove the elastic hook on the housing 300, then manually lift the housing 300 and the suction device 500 upwards. The housing 300 rotates around the hinge support, and under the action of the gas spring, the housing 300 can maintain a certain opening angle, at which point the dust collection bin 200 can be replaced. At the same time, because the housing 300 is lifted upwards and facing backwards, there is more operating space, making it easier to clean the self-cleaning device 100.

[0075] The sweeper 1000 of this application embodiment, by cooperating with a water-absorbing dust suppression structure, realizes the arrangement of a wet-type barrel dust removal system, which solves the pain point that the existing dry-type barrel dust removal system cannot operate in rainy weather, as well as the problem of clogging and difficulty in cleaning the existing dry-type barrel dust removal system. Compared with the existing wet-type box dust removal system, it reduces costs, facilitates the replacement of garbage cans, improves work efficiency, and has high flexibility.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0077] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0078] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A self-cleaning device, characterized in that, include: The housing assembly (10) has a negative pressure chamber (11) and an air extraction port (12) communicating with the negative pressure chamber (11); An inner shell assembly (20) is fitted inside the outer shell assembly (10) and is extendable and retractable between a first position and a second position along the axial direction of the outer shell assembly (10). The inner cavity of the inner shell assembly (20) is connected to the negative pressure chamber (11). A filter mesh (21) communicating with the inner cavity of the inner shell assembly (20) is provided on the peripheral wall of the inner shell assembly (20). When the inner shell assembly (20) is in the first position, the filter mesh (21) is exposed in the outer shell assembly (10) to filter the airflow leading to the air extraction port (12). When the inner shell assembly (20) is in the second position, it retracts into the outer shell assembly (10) relative to the first position. A water spraying device (30) is connected to the outer shell assembly (10) and the inner shell assembly (20) respectively, and sprays water onto the inner shell assembly (20) when the inner shell assembly (20) moves from the first position to the second position to clean the filter mesh (21); the water spraying device (30) includes: a water storage shell (40), a piston (52), and a water spraying element (54), and the water storage shell (40) is fixedly connected to the outer shell assembly (10). The water storage shell (40) has a water inlet (51); the piston (52) is movably disposed in the water storage shell (40) along the axial direction, the piston (52) defines a water storage cavity communicating with the water inlet (51) in the water storage shell (40), and the piston (52) is fixedly connected to the inner shell assembly (20); the water spraying element (54) communicates with the water storage cavity and is adapted to spray water toward the inner shell assembly (20) to clean the inner shell assembly (20).

2. The self-cleaning device according to claim 1, characterized in that, The water spray component (54) also includes: A water spray frame (55) is fixedly connected to the outer periphery of the outer shell assembly (10). The water spray frame (55) has a water flow channel that is connected to the water storage chamber. The nozzle (56) is connected to the water spray frame (55) and communicates with the water flow channel, and the nozzle (56) is opposite to the inner shell assembly (20).

3. The self-cleaning device according to claim 2, characterized in that, The water spray component (54) further includes a connecting frame (54a) and a hose (54b). One end of the connecting frame (54a) is fitted inside the water storage shell (40) and connected to the piston (52), and the other end is fixedly connected to the inner shell assembly (20). A water passage is constructed inside the connecting frame (54a) to communicate with the water storage chamber. The hose (54b) is located outside the outer shell assembly (10), and one end of the hose (54b) is connected to the other end of the connecting frame (54a) and communicates with the water passage. The other end of the hose (54b) is connected to the water spray frame (55) and communicates with the water flow channel. And / or, a portion of the peripheral wall of the outer shell assembly (10) protrudes outward to form a clearance protrusion spaced at a predetermined distance from the inner shell assembly (20), the water spray frame (55) is disposed on the outside of the outer shell assembly (10) and surrounding the clearance protrusion, the clearance protrusion having a clearance port for the nozzle (56) to spray water toward the inner shell assembly (20) located inside the outer shell assembly (10).

4. The self-cleaning device according to claim 1, characterized in that, The self-cleaning device further includes a damping element (53) configured to apply an elastic thrust to the inner shell assembly (20) to move the inner shell assembly (20) toward the first position; And / or, the self-cleaning device further includes an inlet pipe (57) and a one-way valve (58), the one-way valve (58) being connected between the inlet pipe (57) and the inlet (51), and the one-way valve (58) being configured to allow one-way flow from the inlet pipe (57) to the inlet (51).

5. The self-cleaning device according to claim 1, characterized in that, The outer shell assembly (10) includes a first cylindrical body (13) and an end plate (14). The end plate (14) is disposed at one end of the first cylindrical body (13), and the other end of the first cylindrical body (13) is open. The air extraction port (12) is disposed on the end plate (14). The inner shell assembly (20) is sleeved inside the first cylindrical body (13), and the inner shell assembly (20) extends from the other end of the first cylindrical body (13) at the first position. And / or, the inner shell assembly (20) includes a second cylinder (22), a filter screen (23) and a pressure valve (26), the second cylinder (22) being fitted inside the first cylinder (13), the first cylinder (13) being open at one end near the end plate (14); the filter screen (23) being disposed at one end of the first cylinder (13) away from the end plate (14); the pressure valve (26) being disposed inside the filter screen (23) and closing the filter screen (23), the pressure valve (26) being open when the inner shell assembly (20) is in the second position, and the filter screen hole (21) being disposed at one end of the second cylinder (22) adjacent to the filter screen (23).

6. The self-cleaning device according to claim 1, characterized in that, The inner shell assembly (20) is provided with a roller (24), and the inner circumferential surface of the outer shell assembly (10) is provided with a sliding groove (15) that rolls with the roller (24). The sliding groove (15) extends along the axial direction of the outer shell assembly (10). When the inner shell assembly (20) moves between the first position and the second position, the roller (24) rolls along the sliding groove (15).

7. The self-cleaning device according to claim 6, characterized in that, The inner shell assembly (20) includes a second cylinder (22), a mounting bracket (27), and a connecting bracket (28). The second cylinder (22) has a notch on its peripheral wall. The mounting bracket (27) is located inside the second cylinder (22) and is fixedly connected to the second cylinder (22). The mounting bracket (27) is U-shaped with its opening facing the notch. The first end of the connecting bracket (28) is connected to the mounting bracket (27), and the second end extends downward towards the notch. The roller (24) is rotatably connected to the second end of the connecting bracket (28). A portion of the roller (24) is located inside the second cylinder (22), and another portion extends through the notch and out of the outer peripheral surface of the second cylinder (22). The peripheral wall of the second cylinder (22) has a plurality of notches, and the plurality of notches are arranged along the circumference of the second cylinder (22). And / or, at least one of the top and bottom of the groove (15) is provided with a roller (24) limiting structure for limiting the inner shell assembly (20).

8. A dust removal system, characterized in that, include: Dust collection bin (200); A housing (300) is provided, which covers the dust collection bin (200) and has an air inlet (301). A suction nozzle device (400) is connected to the housing (300) and communicates with the air inlet (301); The self-cleaning device according to any one of claims 1-7 is disposed in the housing (300) and connected to the housing (300); An air extraction device (500) is connected to the housing (300) and communicates with the air extraction port (12). The air extraction device (500) drives the airflow from the suction nozzle device (400) into the housing (300) and the dust collection bin (200), and after being filtered by the filter mesh (21), it is sent out from the air extraction device (500).

9. A road sweeper, characterized in that, Includes the dust removal system according to claim 8.

Images