A back-suction air duct based on a floor scrubber base station

Abstract

This invention discloses a back-suction air duct based on a floor scrubber base station, belonging to the field of cleaning equipment technology. It includes a back-suction fan, a dust collection bag, a wastewater tank, and a back-suction pipe. The back-suction fan, dust collection bag, wastewater tank, and back-suction pipe are sequentially connected to form the back-suction air duct, and a dual-duct automatic switching mechanism for separating wet and dry waste is provided between the wastewater tank and the dust collection bag. Compared with the prior art, the beneficial effects of this invention are: First, the wastewater back-suction system of this invention, equipped with a back-suction pipe, wastewater tank, dust collection bag, back-suction fan, wet-dry separation device, and dual-duct automatic switching mechanism, can achieve the separation of wet and dry waste in the wastewater tank, realizing the classified treatment of solid waste and wastewater, which is more environmentally friendly and efficient; second, it has a simple structure, is convenient and practical, and is easy to use and promote.

Description

Technical Field

[0001] This invention belongs to the field of cleaning equipment technology, and specifically relates to a return air duct based on a floor scrubber base station. Background Technology

[0002] A floor scrubber is a common type of floor cleaning equipment. It typically includes a wastewater tank, a clean water tank, and a roller brush assembly and rollers located at the bottom. The rollers facilitate the floor scrubber's movement on the floor, and the roller brush assembly is equipped with roller brushes. Water is supplied to the roller brushes through the clean water tank, and the roller brushes scrub the floor. During the scrubbing process, stains and small solid debris on the floor are absorbed into the roller brushes, forming turbid wastewater containing solid debris. Then, a power mechanism creates a vacuum to collect the wastewater and solid debris from the roller brushes back into the wastewater tank inside the machine, thus preventing wastewater from spreading on the floor and completing the floor scrubbing work.

[0003] After cleaning the floor, the floor scrubber needs to process the wastewater and solid waste in its wastewater tank, cleaning the tank and replenishing the machine's power. The floor scrubber base station is the device that performs these functions. It uses a back-suction fan to create a negative pressure back-suction duct to draw back the dry and wet waste from the wastewater tank, allowing for repeated cleaning. However, existing base station-based back-suction ducts typically cannot switch between ducts, hindering the separation and recycling of dry and wet waste in the wastewater tank, resulting in poor wastewater tank processing efficiency and effectiveness. Summary of the Invention

[0004] To address the aforementioned issues, the primary objective of this invention is to provide a back-suction air duct based on a floor scrubber base station, capable of switching air ducts, separating wet and dry waste in the wastewater bin, and achieving classified treatment of solid waste and wastewater, making it more environmentally friendly and efficient.

[0005] Another objective of this invention is to provide a return air duct based on a floor scrubber base station, which is simple in structure and easy to use.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] This invention provides a back-suction air duct based on a floor scrubber base station, including a back-suction fan, a dust collection bag, a wastewater tank, and a back-suction pipe. The back-suction fan, dust collection bag, wastewater tank, and back-suction pipe are sequentially connected to form the back-suction air duct, and a dual-duct automatic switching mechanism capable of separating dry and wet waste is provided between the wastewater tank and the dust collection bag.

[0008] Furthermore, the wastewater tank is also equipped with a wet-dry separation device, which includes a wet-dry separation box located at the top of the wastewater tank. The rear end of the back suction pipe is connected to the wet-dry separation box. A drainage hole is provided at the bottom of the wet-dry separation box. A wet-dry separation mounting side plate is also provided between the wet-dry separation box and the dust collection bag. Corresponding solid waste back suction ports are provided on the side walls of the wet-dry separation box, the wastewater tank, and the wet-dry separation mounting side plate. These solid waste back suction ports are interconnected to form a solid waste back suction channel. The dry and wet separation box and the dust collection bag are connected through a solid waste back suction channel. The wastewater tank and the side wall of the dry and wet separation installation side plate are also provided with back suction air outlets, and the back suction air outlets are connected to form a back suction airflow channel. The wastewater tank and the dust collection bag are connected through the back suction airflow channel, and the solid waste back suction channel and the back suction airflow channel are arranged horizontally side by side at the same height. The solid waste back suction port is also provided with a first flip-top baffle that can be flipped upward with the back suction of the airflow, and a second flip-top baffle that can be flipped upward with the back suction of the airflow. In this application, when the back-suction fan is not operating, both the first and second flip-top baffles are in normal condition, respectively blocking the solid waste back-suction port and the back-suction airflow port, closing the solid waste back-suction channel and the back-suction airflow channel. When the airflow is back-suctioned, the suction force generated can cause the first and second flip-top baffles to flip up, opening the solid waste back-suction channel and the back-suction airflow channel. The dual-channel automatic switching mechanism can block the first or second flip-top baffles to prevent them from flipping up under the push of the airflow. The back-suction process of this duct is as follows: At the start of the back-suction, the first air collection occurs. The dual-duct automatic switching mechanism blocks the first flap baffle, and the back-suction airflow pushes the second flap baffle open, opening the back-suction airflow port. The airflow direction is: back-suction fan, dust bag, back-suction airflow port, wastewater tank, wet-dry separation box, and back-suction pipe. A negative pressure is created in the sealed wastewater tank, drawing both wet and dry waste from the floor scrubber's wastewater bucket into the wet-dry separation box. Wastewater leaks directly from the bottom of the wet-dry separation box into the wastewater tank below, while solid waste remains in the wet-dry separation box, achieving separation of wet and dry waste. During the second air collection, the dual-duct automatic switching mechanism operates again, blocking the second flap baffle and releasing the first flap baffle. The back-suction airflow pushes the first flap baffle open, opening the solid waste back-suction port, switching the airflow from the back-suction airflow port to the solid waste back-suction port, drawing the solid waste from the wet-dry separation box into the dust bag.

[0009] Furthermore, the dual-duct automatic switching mechanism is installed on the dry-wet separation mounting side plate and positioned below the solid waste return suction port and the return airflow port. It includes an electromagnetic push-pull rod, a rotating connecting rod, a transmission rod, and a push rod spring. The electromagnetic push-pull rod is movably mounted on the back side of the dry-wet separation mounting side plate. A flip-top bottom plate is located below the solid waste return suction port and the return airflow port on the dry-wet separation mounting side plate. The flip-top bottom plate protrudes beyond the back side of the dry-wet separation mounting side plate. One end of the push rod spring abuts against the upper end of the electromagnetic push-pull rod, and the other end abuts against the lower end of the flip-top bottom plate. The transmission rod includes a first transmission rod and a second transmission rod. The second transmission rod is positioned below the return airflow port, and its upper end is connected to the flip-top bottom plate. An integrally formed transmission rod fixing element is provided on the side of the second transmission rod. The first and second transmission rods are fixedly connected to the electromagnetic push-pull rod via transmission rod fixing components. The first transmission rod is located below the solid waste return suction port and its upper end is connected to the flip cover bottom plate. A rotating shaft is provided on the dry and wet separation mounting side plate. A rotating shaft hole is provided in the middle of the rotating connecting rod. The rotating connecting rod is rotatably connected to the rotating shaft through the rotating shaft hole to form a seesaw-like structure. The lower ends of the first and second transmission rods are respectively connected to the two ends of the rotating connecting rod and move up and down alternately as the rotating connecting rod rotates. A valve catch pin with a blocking function is provided at the upper end of the first and second transmission rods. A limiting component that cooperates with the valve catch pin is provided on the back side of both the first and second flip cover baffles. The valve catch pin can penetrate the flip cover bottom plate and move up and down to block or move away from the limiting component. In this application, under normal conditions, the electromagnetic push-pull rod is energized, and the push rod spring is compressed. When the electromagnetic push-pull rod is de-energized, it resets downwards, and the push rod spring pushes the second transmission rod downwards. At the same time, one end of the rotating connecting rod connected to the second transmission rod rotates downwards, while the other end of the rotating connecting rod tilts upwards. The first transmission rod connected to the other end also pushes upwards. The valve pin at the top of the first transmission rod will lock the first flip cover baffle, preventing the first flip cover baffle from being sucked up by negative pressure and opening the solid waste return suction port. The solid waste return suction channel is closed. The valve pin at the top of the second transmission rod will move away from the limiting part of the second flip cover baffle as the second transmission rod moves downwards, and will not block the second flip cover baffle from flipping up. The second flip cover baffle will flip up and open the return airflow port. The return airflow channel is opened, and the first air collection is performed, sucking the dry and wet waste back into the dry and wet separation box. Sewage will leak from the dry and wet separation box into the sewage tank, and solid waste will be temporarily stored in the dry and wet separation box 251.When the electromagnetic push-pull rod is energized, it moves relative to the second transmission rod, causing it to move upward. The valve pin on the second transmission rod blocks the second flip cover from flipping up, closing the return air intake port and the return air intake channel. At the same time, the rotating connecting rod performs a rocker motion, which drives the first transmission rod to move downward, releasing the first flip cover. The first flip cover is pushed upward by the airflow, opening the solid waste return intake port and opening the solid waste return air intake channel. This achieves the switching of the air duct and performs a second air collection, drawing the filtered solid waste temporarily stored in the dry and wet separation box into the dust collection bag.

[0010] Furthermore, the wastewater tank includes a wastewater tank body and a wastewater tank cover. The wastewater tank cover closes onto the wastewater tank body to form a sealed space. A dry-wet separation box fixing groove is provided on the upper part of the wastewater tank body. The bottom of the dry-wet separation box is detachably installed in the dry-wet separation box fixing groove, and the main body of the dry-wet separation box is located inside the wastewater tank cover. The solid waste back-suction port and back-suction airflow port of the wastewater tank are located on the side wall of the wastewater tank cover. A first flip-top baffle is hinged to the solid waste back-suction port of the wastewater tank cover, and a second flip-top baffle is hinged to the back-suction airflow port of the wastewater tank cover. A back-suction pipe clearance groove is provided on the outer side of the wastewater tank body. A dry-wet waste outlet connector is provided at the upper end of the back-suction pipe clearance groove. The end of the back-suction pipe is connected to the dry-wet waste outlet connector. A clearance through hole is provided on the dry-wet separation box, and the dry-wet waste outlet connector extends into the dry-wet separation box through the clearance through hole. The dry and wet waste in the wastewater tank of the floor scrubber can enter the dry and wet separation box through the back suction pipe and the dry and wet waste outlet connector.

[0011] Furthermore, a dust collection cover is provided above the dust collection bag, and a dust collection sealing ring is provided below the dust collection cover. When the return suction fan is extracting solid waste, the dust collection cover and the dust collection sealing ring can seal the space of the dust collection bag. The first flip-top baffle of the solid waste return suction port opens under negative pressure, and the solid waste moves along the airflow direction. Because the dust collection bag is breathable but also closed when the air is being extracted, only the airflow can pass through the fan, and other solid waste falls into the dust collection bag.

[0012] Furthermore, the back-suction fan includes a fan body, a fan mounting bracket, a sound-absorbing sponge, and a bracket cover plate. The sound-absorbing sponge is sleeved outside the fan body and is integrally installed inside the fan mounting bracket with the fan body. The bracket cover plate is installed at the lower end of the fan mounting bracket and wraps around the bottom of the fan body.

[0013] Furthermore, the upper and lower parts of the fan body are provided with fixed buffer pads, and the fan body is connected to the support cover plate and the fan fixed support through fixed buffer pads.

[0014] Furthermore, the upper part of the fan body is provided with a fan inlet, and the bracket cover is provided with a fan exhaust port that communicates with the fan body. The fan inlet is connected to the dust collection bag.

[0015] Furthermore, both the fan mounting bracket and the fixed buffer pad on the upper part of the fan body are vertically continuous structures, which can prevent them from forming an obstruction between the fan inlet and the dust collection bag. The airflow generated when the back suction fan is suctioning can smoothly pass from the dust collection bag through the fan mounting bracket and the fixed buffer pad on the upper part of the fan body into the back suction fan.

[0016] Furthermore, a target-shaped filter bracket is installed between the fan inlet and the dust collection bag. This target-shaped filter bracket is located above the fan body, and a HEPA filter is installed inside it. The HEPA filter primarily filters air impurities and prevents moisture from entering the back-suction fan.

[0017] Furthermore, a filter mesh is also provided on the target filter bracket, which covers the HEPA filter. The filter mesh can be made of nylon material and serves to filter air impurities and fix the HEPA filter. In this application, the back-suction fan generates negative pressure when it starts, and the air passes through the nylon mesh on the target filter bracket, through the HEPA filter, to the fan inlet, then through the sound-absorbing sponge to reduce frequency vibration, and then through the one-way exhaust duct composed of the fan fixing bracket and the bracket cover plate, and is then discharged from the exhaust port.

[0018] Furthermore, the target-center filter bracket includes a support body with a target-center structure and a reinforcing bracket with a cross-shaped structure, the support body and the reinforcing bracket being integrally formed. The target-center filter bracket can be removed to clean the filter cloth and HEPA filter. HEPA filter: mainly serves to filter air impurities and prevent moisture from entering the fan.

[0019] Furthermore, the bracket cover plate is detachably connected to the fan mounting bracket.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] First, the wastewater back-suction system of the present invention is equipped with a back-suction pipe, a wastewater tank, a dust collection bag, a back-suction fan, a dry-wet separation device, and a dual-air duct automatic switching mechanism, which can realize the separation of dry and wet waste in the wastewater tank and achieve the classified treatment of solid waste and wastewater, making it more environmentally friendly and efficient.

[0022] Secondly, it has a simple structure, is convenient and practical, and is easy to use and promote. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the return air duct in this embodiment.

[0024] Figure 2 This is a schematic diagram of the structure of this embodiment.

[0025] Figure 3 This is an exploded view of the sewage tank in this embodiment.

[0026] Figure 4 This is a schematic diagram of the dry-wet separation device in this embodiment.

[0027] Figure 5 This is a schematic diagram of the automatic switching mechanism for dual air ducts in this embodiment.

[0028] Figure 6 This is an exploded view of the back-suction fan in this embodiment.

[0029] In the picture:

[0030] 1. Back suction pipe, 2. Sewage tank, 3. Dust collection bag, 4. Back suction fan, 5. Dry and wet separation device, 6. Dual air duct automatic switching mechanism, 100. Back suction air duct, 200. Base station body.

[0031] 21. Wastewater tank body; 22. Wastewater tank cover; 23. Dry and wet separation box fixing groove; 24. Back suction pipe clearance groove; 25. Dry and wet waste outlet connector.

[0032] 31. Dust collection cover; 32. Dust collection sealing ring.

[0033] 41. Fan body, 42. Fan mounting bracket, 43. Sound-absorbing sponge, 44. Bracket cover plate, 45. Fixed buffer pad, 46. Fan air inlet, 47. Fan air outlet, 48. Target filter bracket, 49. HEPA filter, 481. Bracket body, 482. Reinforcing bracket.

[0034] 51. Dry and wet separation box; 52. Drain hole; 53. Dry and wet separation installation side plate; 54. Solid waste return suction port; 55. Return suction airflow port; 56. First flip cover baffle; 57. Second flip cover baffle; 58. Limiting component; 511. Clearance through hole.

[0035] 61. Electromagnetic push-pull rod; 62. Rotary connecting rod; 63. Push rod spring; 64. Flip cover base plate; 65. First transmission rod; 66. Second transmission rod; 67. Transmission rod fixing component; 68. Rotary shaft; 69. Valve retainer; 621. Rotary shaft hole. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] like Figure 1-6As shown, the implementation of this embodiment is as follows:

[0038] This embodiment provides a back-suction duct based on a floor scrubber base station, including a back-suction fan 4, a dust collection bag 3, a wastewater tank 2, and a back-suction pipe 1. The back-suction fan 4, dust collection bag 3, wastewater tank 2, and back-suction pipe 1 are sequentially connected to form the back-suction duct 100, and a dual-duct automatic switching mechanism 6 capable of separating wet and dry waste is provided between the wastewater tank 2 and the dust collection bag 3. In this application, the wastewater tank 2 is used to store wastewater from the floor scrubber's wastewater bucket, and the dust collection bag 3 is used to store solid waste from the floor scrubber's wastewater bucket. During back-suction, the back-suction fan 4 generates negative pressure in the sealed wastewater tank 2, and the wet and dry waste in the floor scrubber's wastewater bucket is sucked back to the upper part of the wastewater tank 2 through the back-suction duct 100. The wastewater leaks into the wastewater bucket below under its own gravity, while the solid waste is sucked into the dust collection bag 3 by the suction generated by the back-suction fan 4, realizing the back-suction and separation of wet and dry waste in the floor scrubber's wastewater bucket.

[0039] Furthermore, a wet-dry separation device 5 is also installed inside the sewage tank 2. The wet-dry separation device 5 includes a wet-dry separation box 51, which is installed inside the sewage tank 2 and located at the top of the sewage tank 2. The rear end of the back suction pipe 1 is connected to the wet-dry separation box 51. A water leakage hole 52 is provided at the bottom of the wet-dry separation box 51. A wet-dry separation installation side plate 53 is also provided between the wet-dry separation box 51 and the dust collection bag 3. Solid waste back suction ports 54 with corresponding positions are provided on the side walls of the wet-dry separation box 51, the sewage tank 2, and the wet-dry separation installation side plate 53. The solid waste back suction ports 54 are connected to form a solid waste back suction port. The solid waste return suction channel connects the dry and wet separation box 51 and the dust collection bag 3. The sewage tank 2 and the side wall of the dry and wet separation installation side plate 53 are also provided with return airflow ports 55, and the return airflow ports 55 are connected to form a return airflow channel. The sewage tank 2 and the dust collection bag 3 are connected through the return airflow channel. The solid waste return suction channel and the return airflow channel are arranged horizontally side by side at the same height. The solid waste return suction port 54 is also provided with a first flip-top baffle 56 that can flip up with the airflow. The return airflow port 55 is provided with a second flip-top baffle 57 that can flip up with the airflow. In this application, when the back-suction fan 4 is not operating, the first flip-top baffle 56 and the second flip-top baffle 57 are in normal condition, respectively blocking the solid waste back-suction port 54 and the back-suction airflow port 55, closing the solid waste back-suction channel and the back-suction airflow channel. When the airflow is back-suctioned, the suction force generated can cause the first flip-top baffle 56 and the second flip-top baffle 57 to flip up, opening the solid waste back-suction channel and the back-suction airflow channel. The dual-channel automatic switching mechanism 6 can block the first flip-top baffle 56 or the second flip-top baffle 57 to prevent the first flip-top baffle 56 or the second flip-top baffle 57 from flipping up under the push of the airflow. In the wastewater back-suction system 2, the back-suction process is as follows: at the beginning of the back-suction, the first air collection is carried out, the dual-air duct automatic switching mechanism 6 works to block the first flip-top baffle 56, the airflow back-suction pushes the second flip-top baffle 57 to flip up and open the back-suction airflow port 55. The airflow back-suction direction is: back-suction fan 4, dust collection bag 3, back-suction airflow port 55, wastewater tank 2, dry and wet separation box 51, back-suction pipe 1. A negative pressure is formed in the sealed wastewater tank 2, which sucks the dry and wet garbage in the wastewater tank of the floor scrubber into the dry and wet separation box 51. The wastewater leaks directly into the wastewater tank 2 below from the drain hole 52 at the bottom of the dry and wet separation box 51, while the solid garbage remains in the dry and wet separation box 51, thus achieving the separation of dry and wet garbage. During the second air collection, the dual-channel automatic switching mechanism 6 works again, blocking the second flip-top baffle 57 and releasing the first flip-top baffle 56. The airflow back draws in and pushes the first flip-top baffle 56 to flip up and open the solid waste back suction port 54, thus switching the airflow from the back suction airflow port 55 to the solid waste back suction port 54, sucking the solid waste in the dry and wet separation box 51 into the dust collection bag 3.

[0040] Furthermore, the dual-duct automatic switching mechanism 6 is installed on the dry-wet separation mounting side plate and positioned below the solid waste return suction port 54 and the return airflow port 55. It includes an electromagnetic push-pull rod 61, a rotating connecting rod 62, a transmission rod, and a push rod spring 63. The electromagnetic push-pull rod 61 is movably mounted on the back side of the dry-wet separation mounting side plate 53. A flip-top bottom plate 64 is located below the solid waste return suction port 54 and the return airflow port 55 on the dry-wet separation mounting side plate 53. The flip-top bottom plate 64 protrudes beyond the back side of the dry-wet separation mounting side plate 53. One end of the push rod spring 63 abuts against the upper end of the electromagnetic push-pull rod 61, and the other end abuts against the lower end of the flip-top bottom plate 64. The transmission rod includes a first transmission rod 65 and a second transmission rod 66. The second transmission rod 66 is positioned below the return airflow port 55, and its upper end is connected to the flip-top bottom plate 64. An integrally formed transmission rod fixing member 67 is provided on the side of the second transmission rod 66. The transmission rod 66 is fixedly connected to the electromagnetic push-pull rod 61 via the transmission rod fixing member 67. The first transmission rod 65 is located below the solid waste return suction port 54 and its upper end is connected to the flip cover bottom plate 64. A rotating shaft 68 is provided on the dry and wet separation installation side plate 53. A rotating shaft hole 621 is provided in the middle of the rotating connecting rod 62. The rotating connecting rod 62 is rotatably connected to the rotating shaft 68 through the rotating shaft hole 621 to form a seesaw-type structure. The lower ends of the first transmission rod 65 and the second transmission rod 66 are respectively connected to the two ends of the rotating connecting rod 62 and move up and down alternately with the rotation of the rotating connecting rod 62. The upper ends of the first transmission rod 65 and the second transmission rod 66 are provided with valve locking pins 69 with a blocking function. The back sides of the first flip cover baffle 56 and the second flip cover baffle 57 are provided with limiting members 58 that cooperate with the valve locking pins 69. The valve locking pins 69 can penetrate the flip cover bottom plate 64 and move up and down to block or move away from the limiting members 58. In this application, under normal conditions, the electromagnetic push-pull rod 61 is energized, and the push rod spring 63 is compressed. When the electromagnetic push-pull rod 61 is de-energized, it returns to its original position downwards. The push rod spring 63 pushes the second transmission rod 66 downwards. At the same time, one end of the rotating connecting rod 62 connected to the second transmission rod 66 rotates downwards, while the other end of the rotating connecting rod 62 tilts upwards. The first transmission rod 65 connected to the other end also pushes upwards. The valve catch 69 at the top of the first transmission rod 65 will lock the first flip cover baffle 56, preventing the first flip cover baffle 56 from being subjected to negative pressure. The air is drawn upwards and opens the solid waste return suction port 54, closing the solid waste return suction channel. The valve pin 69 at the top of the second transmission rod 66 moves downwards with the second transmission rod 66 and moves away from the limiting part 58 of the second flip cover baffle 57, so it will not block the second flip cover baffle 57 from flipping upwards. The second flip cover baffle 57 will flip upwards and open the return airflow port 55, opening the return airflow channel for the first air collection, drawing the dry and wet waste back into the dry and wet separation box 51. Sewage will leak from the dry and wet separation box 51 into the sewage tank 2, and solid waste will be temporarily stored in the dry and wet separation box 51.When the electromagnetic push-pull rod 61 is energized, it moves relative to the second transmission rod 66, causing it to move upward. The valve pin 69 on the second transmission rod 66 blocks the second flip cover baffle 57 from flipping up, closing the return air intake port 55 and the return air intake channel. At the same time, the rotating connecting rod 62 moves like a rocker, causing the first transmission rod 65 to move downward, releasing the first flip cover baffle 56. The first flip cover baffle 56 is pushed upward by the airflow, opening the solid waste return intake port 54, opening the solid waste return air intake channel, realizing the switching of the air duct, and performing a second air collection, drawing the filtered solid waste temporarily stored in the dry and wet separation box 51 into the dust collection bag 3.

[0041] Furthermore, the sewage tank 2 includes a sewage tank body 21 and a sewage tank cover 22. The sewage tank cover 22 covers the sewage tank body 21 to form a sealed space. The upper part of the sewage tank body 21 is provided with a dry and wet separation box fixing groove 23. The bottom of the dry and wet separation box 51 is detachably installed in the dry and wet separation box fixing groove 23, and the main body of the dry and wet separation box 51 is set inside the sewage tank cover 22. The solid waste back suction port 54 and the back suction airflow port 55 of the sewage tank 2 are set on the side wall of the sewage tank cover 22. The first flip cover baffle 56 is hinged to the solid waste back suction port 54 of the sewage tank cover 22, and the second flip cover baffle 57 is hinged to the back suction airflow port 55 of the sewage tank cover 22. The outer side of the wastewater tank body 21 is provided with a back-suction pipe clearance groove 24. A dry / wet waste outlet connector 25 is provided at the upper end of the back-suction pipe clearance groove 24. The end of the back-suction pipe 1 connects to the dry / wet waste outlet connector 25. A clearance through-hole 511 is provided on the dry / wet separation box 51, through which the dry / wet waste outlet connector 25 extends into the dry / wet separation box 51. Dry and wet waste in the wastewater tank of the floor scrubber can enter the dry / wet separation box 51 through the back-suction pipe 1 and the dry / wet waste outlet connector 25. The wastewater tank body 21 is mainly used to store wastewater. The wastewater tank cover 22 mainly seals the wastewater tank 2, and can also support weight and facilitate the placement of air ducts. The dry / wet separation box 51 can be replaced and cleaned to ensure the cleanliness of the wastewater tank 2.

[0042] Furthermore, a dust collection cover plate 31 is provided above the dust collection bag 3. The dust collection bag 3 is installed inside the base station body 200 and sealed by the dust collection cover plate 31. A dust collection sealing ring 32 is also provided below the dust collection cover plate 31, and the dust collection cover plate 31 and the base station body 200 are connected by the dust collection sealing ring 32. When the return suction fan 4 is extracting solid waste, the dust collection cover plate 31 and the dust collection sealing ring 32 can seal the space of the dust collection bag 3. The first flip-top baffle 56 of the solid waste return suction port 54 is opened by negative pressure, and the solid waste moves along the airflow direction. Because the dust collection bag 3 is breathable but also closed when the air is being extracted, only the airflow can pass through the fan, and other solid waste falls into the dust collection bag 3.

[0043] Furthermore, the back-suction fan 4 includes a fan body 41, a fan fixing bracket 42, a sound-absorbing sponge 43, and a bracket cover plate 44. The sound-absorbing sponge 43 is sleeved on the outside of the fan body 41 and is integrally installed with the fan body 41 inside the fan fixing bracket 42. The bracket cover plate 44 is installed at the lower end of the fan fixing bracket 42 and wraps around the bottom of the fan body 41.

[0044] Furthermore, the upper and lower parts of the fan body 41 are provided with fixed buffer pads 45, and the fan body 41 is connected to the support cover plate 44 and the fan fixed support 42 through the fixed buffer pads 45.

[0045] Furthermore, a fan inlet 46 is provided on the upper part of the fan body 41, and a fan exhaust port 47 connected to the fan body 41 is provided on the bracket cover plate 44. The fan inlet 46 is connected to the dust collection bag 3.

[0046] Furthermore, both the fan mounting bracket 42 and the fixed buffer pad 45 on the upper part of the fan body 41 are vertically connected structures, which can prevent the two from forming an obstruction between the fan inlet 46 and the dust collection bag 3. The airflow generated when the back suction fan 4 back suctions can smoothly pass from the dust collection bag 3 through the fan mounting bracket 42 and the fixed buffer pad 45 on the upper part of the fan body 41 into the back suction fan 4.

[0047] Furthermore, a target-shaped filter bracket 48 is installed between the fan inlet 46 and the dust collection bag 3. The target-shaped filter bracket 48 is located above the fan body 41, and a HEPA filter 49 is installed inside the target-shaped filter bracket 48. The HEPA filter 49 mainly serves to filter air impurities and prevent moisture from entering the return fan 4.

[0048] Furthermore, a filter mesh (not shown) is also provided on the target filter bracket 48, which covers the HEPA filter 49. The filter mesh can be made of nylon material and serves to filter air impurities and fix the HEPA filter 49. In this application, the back suction fan 4 generates negative pressure when it starts. The air passes through the HEPA filter from the nylon mesh on the target filter bracket 48, reaches the fan inlet 46, passes through the sound-absorbing sponge 43 to weaken frequency vibration, passes through the one-way exhaust duct formed by the fan fixing bracket 42 and the bracket cover plate 44, and is then discharged from the exhaust port.

[0049] Furthermore, the target-shaped filter bracket 48 includes a bracket body 481 with a target-shaped structure and a reinforcing bracket 482 with a cross-shaped structure, the bracket body 481 and the reinforcing bracket 482 being integrally formed. The target-shaped filter bracket can be removed to clean the filter cloth and HEPA filter. HEPA filter: mainly serves to filter air impurities and prevent moisture from entering the fan.

[0050] Furthermore, the bracket cover plate 44 is detachably connected to the fan mounting bracket 42.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A return air duct based on a floor scrubber base station, characterized in that, It includes a back-suction fan, a dust collection bag, a wastewater tank, and a back-suction pipe. The back-suction fan, dust collection bag, wastewater tank, and back-suction pipe are connected in sequence to form the back-suction air duct. A dual-duct automatic switching mechanism capable of separating dry and wet waste is provided between the wastewater tank and the dust collection bag. The wastewater tank is also equipped with a wet-dry separation device, which includes a wet-dry separation box located at the top of the wastewater tank. The rear end of the back suction pipe is connected to the wet-dry separation box. A drainage hole is provided at the bottom of the wet-dry separation box. A wet-dry separation installation side plate is also provided between the wet-dry separation box and the dust collection bag. Corresponding solid waste back suction ports are provided on the side walls of the wet-dry separation box, the wastewater tank, and the wet-dry separation installation side plate. These solid waste back suction ports are interconnected to form a solid waste back suction channel. The wet separation box and the dust collection bag are connected through the solid waste back suction channel. The side wall of the sewage tank and the dry and wet separation installation side plate is also provided with a back suction airflow port, and the back suction airflow ports are connected to form a back suction airflow channel. The sewage tank and the dust collection bag are connected through the back suction airflow channel, and the solid waste back suction channel and the back suction airflow channel are arranged horizontally side by side at the same height. The solid waste back suction port is also provided with a first flip-top baffle that can be flipped up with the back suction airflow, and the back suction airflow port is provided with a second flip-top baffle that can be flipped up with the back suction airflow. The dual-duct automatic switching mechanism is installed on the dry-wet separation mounting side plate and located below the solid waste return suction port and the return airflow port. It includes an electromagnetic push-pull rod, a rotating connecting rod, a transmission rod, and a push rod spring. The electromagnetic push-pull rod is movably installed on the back side of the dry-wet separation mounting side plate. A flip-top bottom plate is located below the solid waste return suction port and the return airflow port on the dry-wet separation mounting side plate. The flip-top bottom plate protrudes beyond the back side of the dry-wet separation mounting side plate. One end of the push rod spring abuts against the upper end of the electromagnetic push-pull rod, and the other end abuts against the lower end of the flip-top bottom plate. The transmission rod includes a first transmission rod and a second transmission rod. The second transmission rod is located below the return airflow port, and its upper end is connected to the flip-top bottom plate. An integrally formed transmission rod fixing component is provided on the side of the second transmission rod. Two transmission rods are fixedly connected to the electromagnetic push-pull rod via transmission rod fixing parts. The first transmission rod is located below the solid waste return suction port and its upper end is connected to the flip cover bottom plate. A rotating shaft is provided on the dry and wet separation mounting side plate. A rotating shaft hole is provided in the middle of the rotating connecting rod. The rotating connecting rod is rotatably connected to the rotating shaft through the rotating shaft hole to form a seesaw-type structure. The lower ends of the first and second transmission rods are respectively connected to the two ends of the rotating connecting rod and move up and down alternately as the rotating connecting rod rotates. The upper ends of the first and second transmission rods are provided with valve locking pins that have a blocking function. The back sides of the first and second flip cover baffles are provided with limiting parts that cooperate with the valve locking pins. The valve locking pins can penetrate the flip cover bottom plate and move up and down to block or move away from the limiting parts.

2. The return air duct based on a floor scrubber base station as described in claim 1, characterized in that, The sewage tank includes a sewage tank body and a sewage tank cover. The sewage tank cover closes onto the sewage tank body to form a sealed space. A dry and wet separation box fixing groove is provided on the upper part of the sewage tank body. The bottom of the dry and wet separation box is detachably installed in the dry and wet separation box fixing groove, and the main body of the dry and wet separation box is set inside the sewage tank cover. The solid waste back suction port and the back suction airflow port of the sewage tank are set on the side wall of the sewage tank cover. The first flip-top baffle is hinged to the solid waste back suction port of the sewage tank cover, and the second flip-top baffle is hinged to the back suction airflow port of the sewage tank cover.

3. The return air duct based on a floor scrubber base station as described in claim 2, characterized in that, The outer side of the main body of the sewage tank is provided with a back suction pipe clearance groove. The upper end of the back suction pipe clearance groove is provided with a dry and wet waste outlet connector. The end of the back suction pipe is connected to the dry and wet waste outlet connector. The dry and wet separation box is provided with a clearance through hole. The dry and wet waste outlet connector extends into the dry and wet separation box through the clearance through hole.

4. The return air duct based on a floor scrubber base station as described in claim 1, characterized in that, A dust collection cover is provided above the dust collection bag, and a dust collection sealing ring is provided below the dust collection cover.

5. The return air duct based on a floor scrubber base station as described in claim 1, characterized in that, The back-suction fan includes a fan body, a fan mounting bracket, a sound-absorbing sponge, and a bracket cover plate. The sound-absorbing sponge is sleeved on the outside of the fan body and is integrally installed inside the fan mounting bracket with the fan body. The bracket cover plate is installed at the lower end of the fan mounting bracket and wraps around the bottom of the fan body.

6. The return air duct based on a floor scrubber base station as described in claim 5, characterized in that, Fixed buffer pads are provided on the upper and lower parts of the fan body, and the fan body is connected to the support cover plate and the fan fixed support through fixed buffer pads.

7. The return air duct based on a floor scrubber base station as described in claim 6, characterized in that, The upper part of the fan body is provided with a fan inlet, and the bracket cover is provided with a fan exhaust port that is connected to the fan body. The fan inlet is connected to the dust collection bag.

8. The return air duct based on a floor scrubber base station as described in claim 7, characterized in that, Both the fan mounting bracket and the fixed buffer pad on the upper part of the fan body are vertically continuous structures.

9. The return air duct based on a floor scrubber base station as described in claim 7, characterized in that, A target-shaped filter bracket is also provided between the air inlet of the fan and the dust collection bag. The target-shaped filter bracket is located above the main body of the fan. A HEPA filter is installed inside the target-shaped filter bracket. A filter cloth is also provided on the target-shaped filter bracket, and the filter cloth covers the HEPA filter.

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