WO2024120242A1

WO2024120242A1 - Surface cleaning device

Info

Publication number: WO2024120242A1
Application number: PCT/CN2023/134426
Authority: WO
Inventors: 刘望; 陈维涛; 张金荣; 杨华军; 李名军
Original assignee: 安克创新科技股份有限公司
Priority date: 2022-12-07
Filing date: 2023-11-27
Publication date: 2024-06-13
Also published as: CN118141275A

Abstract

Provided is a surface cleaning device (1), comprising a device body (100), a first fan (210), a second fan (220), and an air duct assembly (250). The device body (100) comprises a main machine (110) and a garbage can (120), the main machine (110) is provided with a dust suction port (1131), and the garbage can (120) is arranged on the main machine (110). The garbage can (120) is provided with a dust inlet (121), an accommodating cavity (123) and an air outlet (122). The dust inlet (121) is in communication with the dust suction port (1131), the dust inlet (121) and the air outlet (122) are both in communication with the accommodating cavity (123), and an airflow flowing into the accommodating cavity (123) from the dust inlet (121) flows out via the air outlet (122). The first fan (210) and the second fan (220) are provided on the device body (100). The air duct assembly (250) is provided on the device body (100), is connected to the first fan (210) and the second fan (220), and has a series connection state and a parallel connection state. In the series connection state, an air outlet side of the first fan (210) is in communication with an air intake side of the second fan (220). In the parallel connection state, an air intake side of the first fan (210) and the air intake side of the second fan (220) intake air in parallel, and the air outlet side of the first fan (210) and an air outlet side of the second fan (220) discharge air in parallel, thereby increasing the cleaning efficiency of the cleaning device.

Description

Surface cleaning equipment

[Technical field]

The present application relates to the technical field of intelligent cleaning equipment, and in particular to surface cleaning equipment.

【Background technique】

With the development of intelligent manufacturing technology and communication technology, more and more smart home devices are serving people's lives, bringing great convenience to people's lives.

Cleaning equipment, such as vacuum cleaners and sweeping robots, can semi-automatically or automatically clean the floor and remove dust by sucking up garbage and objects with a fan. However, if you want to change the cleaning efficiency of the cleaning equipment during the actual cleaning process, such as increasing the power of the fan to improve the cleaning effect, it can often only be achieved by replacing a fan with a higher power. However, it is currently difficult to further break through the fan to a higher power.

[Summary of the invention]

The main technical problem solved by the present application is to provide a surface cleaning device that can improve the cleaning efficiency of the surface cleaning device.

In a first aspect, an embodiment of the present application provides a surface cleaning device, which includes a device body, a first fan, a second fan, and an air duct assembly. The device body is provided with a dust suction port; the device body includes a main unit and a trash can, the main unit is provided with a dust suction port, the trash can is arranged on the main unit, the trash can has a dust inlet, a accommodating chamber, and an air outlet, the dust inlet is connected to the dust suction port, the dust inlet and the air outlet are both connected to the accommodating chamber, and the airflow flowing from the dust inlet into the accommodating chamber flows out through the air outlet; the first fan and the second fan are arranged on the device body for generating airflow; the air duct assembly is arranged on the device body, connecting the first fan and the second fan, and having a series connection state and a parallel connection state that can be switched with each other; wherein the air duct assembly is configured to In the series connection state, the outlet side of the first fan is connected with the inlet side of the second fan, so that the airflow flowing out of the exhaust port flows through the inlet side of the first fan, the outlet side of the first fan, the inlet side of the second fan and the outlet side of the second fan in sequence; in the parallel connection state, the inlet side of the first fan and the inlet side of the second fan are connected in parallel, and the outlet side of the first fan and the outlet side of the second fan are connected in parallel, so that part of the airflow flowing out of the exhaust port flows through the inlet side and the outlet side of the first fan, and the other part flows through the inlet side and the outlet side of the second fan.

The beneficial effects of the present application are as follows: Different from the prior art, the air duct assembly is set in a series state so that the outlet side of the first fan is connected to the inlet side of the second fan, and the air flow out of the exhaust port flows through the inlet side of the first fan, the outlet side of the first fan, the inlet side of the second fan, and the outlet side of the second fan in sequence. At this time, the first fan and the second fan are connected end to end, and the two work in series. When the two fans work in series, they provide a greater centrifugal force for the air in the same air flow channel, thereby providing a greater static pressure for the surface cleaning equipment without changing the power and structure of the fan. In the parallel connection state, the first fan is connected to the second fan, and the second fan is connected to the second fan. When the first fan is connected to the second fan, the second ... The air inlet side of the fan and the air inlet side of the second fan are in parallel, and the air outlet side of the first fan and the air outlet side of the second fan are in parallel, so that part of the airflow flowing out of the exhaust port flows through the air inlet side and the air outlet side of the first fan, and the other part flows through the air inlet side and the air outlet side of the second fan. At this time, the first fan and the second fan are working in parallel. When the two fans work in parallel, the amount of air flowing through per unit time increases, thereby providing a larger air volume for the garbage bin to suck out garbage objects. In this way, by switching between the series connection state and the parallel connection state, the two fans can switch between parallel operation and series operation, thereby providing a larger air volume or a larger static pressure for the surface cleaning equipment without changing the power and structure of the fan, so as to meet different needs in actual use, enrich the functions of the surface cleaning equipment, and improve the cleaning efficiency of the surface cleaning equipment.

【Brief Description of the Drawings】

FIG1 is a schematic structural diagram of an embodiment of a surface cleaning device of the present application;

Fig. 2 is a schematic diagram of the cross-sectional structure shown along the A-A section line in Fig. 1;

Fig. 3 is a schematic cross-sectional structure diagram showing a parallel connection state along the B-B section line in Fig. 2;

Fig. 4 is a schematic cross-sectional structure diagram showing a serially connected state along the B-B section line in Fig. 2;

FIG5 is a static pressure-flow curve diagram of a single fan and a dual fan;

FIG6 is a static pressure-flow curve diagram of the theoretical value and the actual value of the dual-fan;

7 is a perspective structural schematic diagram of the switching channel member in the surface cleaning device shown in FIG. 1 in a parallel connection state;

FIG8 is a perspective structural schematic diagram showing the switching channel member in a serially connected state in the surface cleaning device shown in FIG1;

FIG9 is a schematic diagram of the disassembled structure of the switching channel member shown in FIG1;

FIG10 is a schematic diagram of a disassembled surface cleaning device shown in FIG1 ;

FIG. 11 is a schematic diagram of the three-dimensional structure of the lower shell shown in FIG. 10 .

【Detailed ways】

The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

With the development of intelligent manufacturing technology and communication technology, more and more smart home devices serve people's lives and bring great convenience to people's lives. Surface cleaning equipment, such as vacuum cleaners and sweeping robots, can semi-automatically or automatically achieve floor cleaning, dust removal and other cleaning tasks by using fans to provide air volume and static pressure to suck out garbage objects. The air volume provided by the fan is, for example, the amount of air that flows through the fan per unit time. The larger the air volume, the more surface cleaning per unit time. The more air containing garbage objects is sucked into the cleaning equipment, the more static pressure is generated. The static pressure provided by the fan is, for example, a negative pressure close to vacuum generated by the surface cleaning equipment through the operation of the fan. When the fan discharges the air inside the surface cleaning equipment, a near-vacuum instantaneous state will be formed inside the surface cleaning equipment, forming a negative pressure with the external atmospheric pressure, thereby generating static pressure. Under the action of static pressure, the surface cleaning equipment will suck in air containing garbage objects, thereby achieving the purpose of cleaning.

After long-term research, the inventor of the present application found that the surface cleaning equipment uses the fan to provide air volume and static pressure to suck garbage objects. In actual use, the requirements for air volume and static pressure are different due to the different garbage objects sucked. For example, when sucking more dust on the ground, the fan needs to provide a larger air volume, and when sucking objects such as paper balls that may produce greater resistance, the fan needs to provide a larger static pressure. However, in the current surface cleaning equipment, it is difficult for the fan to increase the static pressure while maintaining the air volume unchanged or to increase the air volume while maintaining the static pressure unchanged. The conventional method is generally to increase the fan power to increase the air volume or static pressure, but the current fan power is difficult to further break through to a larger power, and simply increasing the fan power will cause problems such as shorter battery life, louder noise, and increased heat. Based on this, the present application proposes the following embodiments to solve the above technical problems.

The following surface cleaning device embodiments of the present application describe exemplary structures of surface cleaning devices.

As shown in FIG. 1 , the surface cleaning device 1 may include: a device body 100 and a fan assembly 200 .

The surface cleaning device 1 is used for cleaning. The surface cleaning device 1 is, for example, a sweeping robot, a cleaning robot or a vacuum cleaner, and may have one or more cleaning functions such as vacuuming, sweeping, mopping and washing. Optionally, the surface cleaning device 1 may be a self-propelled surface cleaning device that can walk autonomously or under command control, and then clean the area to be cleaned with dust or garbage.

The device body 100 is used to walk in the area to be cleaned so as to suck and store garbage objects. The fan assembly 200 is detachably connected to the device body 100 to provide suction power for the device body 100. Specifically, the fan assembly 200 can be installed on the device body 100 by insertion, assembly, combination, etc. The device body 100 can have a cleaning function or a dust collection function, and of course can have both cleaning and dust collection functions, and can also have other cleaning functions.

As shown in FIG2 , the device body 100 may be provided with a dust suction port 1131, a receiving chamber 123 and an exhaust port 1132. The dust suction port 1131 and the exhaust port 1132 are connected to the receiving chamber 123, and the airflow flowing from the dust suction port 1131 into the receiving chamber 123 flows out through the exhaust port 1132. As shown in FIG3 , a fan assembly 200 is disposed in the device body 100, and the fan assembly 200 may include a first fan 210 and a second fan 220 for forming an airflow.

As shown in FIG. 2 , the device body 100 includes a main unit 110 and a trash bin 120. The main unit 110 is provided with a suction power by a fan assembly 200 to suck garbage objects. The trash bin 120 is used to store garbage objects. The main unit 110 is provided with a dust suction port 1131. Optionally, the main unit 110 is provided with an installation cavity 111 for accommodating the trash bin 120. The dust suction port 1131 and the exhaust port 1132 are provided on the main unit 110 and connected to the installation cavity 111. The trash bin 120 may be provided with a dust inlet 121, an air outlet 122 and a receiving cavity 123. The dust inlet 121 and the air outlet 122 are connected to the receiving cavity 123. The dust inlet 121 Connected to the dust suction port 1131. The air outlet 122 can be connected to the exhaust port 1132, for example, the air outlet 122 and the exhaust port 1132 can be connected to each other through the fan assembly 200. The airflow formed by the suction power provided by the fan assembly 200 enters the device body 100 from the dust suction port 1131, and enters the accommodating cavity 123 inside the dust bin 120 through the dust inlet 121, and is discharged through the air outlet 122 and the exhaust port 1132 in sequence. The airflow will carry garbage objects into the interior of the dust bin 120, and the dust bin 120 will filter the garbage objects in the airflow. The airflow without garbage objects after filtering by the dust bin 120 will enter the host 110, and then be discharged from the exhaust port 1132 of the host 110.

Optionally, the device body 100 may also include a driving mechanism and a walking wheel mechanism, which are connected by transmission and are arranged on the host 110. The driving mechanism is used to drive the walking wheel mechanism to walk on the area to be cleaned, and the dust suction port 1131 is arranged so that at least part of it can be directed toward the area to be cleaned, so that the airflow formed by the first fan 210 and/or the second fan 220 sucks the garbage objects on the area to be cleaned into the dustbin 120 through the dust suction port 1131. The driving mechanism may include a driving motor, for example, and the driving motor may be a DC motor or an asynchronous motor, or other motors. The walking wheel mechanism may include a rolling wheel, and the number of the rolling wheels may be two, three, four, etc. The driving mechanism drives the rolling wheel to rotate to realize that the surface cleaning device 1 walks on the area to be cleaned.

As shown in FIG3 , the fan assembly 200 may include a first fan 210, a second fan 220, and an air duct assembly 250. The first fan 210 and the second fan 220 are arranged on the device body 100, for example, they can be arranged on the host 110 and/or the trash can 120. In some embodiments, the first fan 210, the second fan 220, and the air duct assembly 250 can be specifically arranged on the host 110. In some embodiments, the first fan 210 and the second fan 220 are detachably connected to the device body 100. The first fan 210 and the second fan 220 are used to generate airflow. The air duct assembly 250 is arranged on the device body 100, and can be specifically arranged on the host 110 and/or the trash can 120, and is connected to the first fan 210 and the second fan 220, and has a serial connection state and a parallel connection state that can be switched to each other.

The air duct assembly 250 is configured to connect the outlet side of the first fan 210 with the inlet side of the second fan 220 in a serial connection state, so that the airflow flowing out of the air outlet 122 flows sequentially through the inlet side of the first fan 210, the outlet side of the first fan 210, the inlet side of the second fan 220, and the outlet side of the second fan 220. In a parallel connection state, the inlet side of the first fan 210 and the inlet side of the second fan 220 are connected in parallel, and the outlet side of the first fan 210 and the outlet side of the second fan 220 are connected in parallel, so that part of the airflow flowing out of the air outlet 122 flows through the inlet side and the outlet side of the first fan 210, and the other part flows through the inlet side and the outlet side of the second fan 220.

By setting the air duct assembly 250, the first fan 210 and the second fan 220 can be connected in series or in parallel. When the first fan 210 and the second fan 220 work in series, a greater centrifugal force is provided for the air in the same airflow channel, thereby providing a greater static pressure for the surface cleaning device 1 without changing the power and structure of the two fans. When the first fan 210 and the second fan 220 work in parallel, the amount of air flowing through per unit time increases, thereby providing a greater air volume for the surface cleaning device 1. In this way, by switching between the series connection state and the parallel connection state, This enables switching between parallel operation and series operation of the two fans, thereby providing the surface cleaning device 1 with a larger air volume or a larger static pressure without changing the fan power and structure, so as to meet different needs in actual use, enrich the functions of the surface cleaning device 1, and improve the cleaning efficiency of the surface cleaning device 1.

Optionally, the air duct assembly 250 includes an air duct member 230 and a switching channel member 240. The air duct member 230 is connected to the device body 100, for example, the air duct member 230 is connected to the host 110. The air duct member 230 is docked with the first fan 210 and the second fan 220. The air duct member 230 can be used to provide an air flow channel. The switching channel member 240 is arranged on the air duct member 230, and is used to switch the internal connection state of the air duct member 230, that is, the connection state of the air flow channel, and then switch the series connection state and the parallel connection state. In some embodiments, the switching channel member 240 is located between the first fan 210 and the second fan 220. In some embodiments, the switching channel member 240 is located on the side of the host 110 away from the dust suction port 1131.

Specifically, the first fan 210 and the second fan 220 can be connected to the air duct member 230 respectively. The first fan 210 and the second fan 220 are devices that convert the mechanical energy of the internal impeller rotation into gas pressure energy and kinetic energy, and suck the gas to form an airflow. Among them, the side where the airflow enters the impeller is the air inlet side of the fan, and the side where the airflow leaves the impeller is the air outlet side of the fan. Specifically, the air inlet side of the fan can be the air inlet of the fan, and the air outlet side of the fan is the air outlet of the fan.

As shown in FIG3 , the exhaust port 1132 may include a first exhaust port 11321 and a second exhaust port 11322. Both the first exhaust port 11321 and the second exhaust port 11322 may be used to discharge airflow from the host 110. In a serially connected state, the first exhaust port 11321 is used to discharge the airflow from the first fan 210, and the second exhaust port 11322 is used to discharge the airflow from the second fan 220.

As shown in FIG3 , the duct member 230 has a first duct inlet 2311, a second duct inlet 2312, a first duct outlet 232, and a second duct outlet 233. The air outlet 122 is connected to the air inlet side of the first fan 210, and the second duct inlet 2312. The first duct inlet 2311 is connected to the air outlet side of the first fan 210, and the second duct outlet 233 is connected to the air inlet side of the second fan 220. Optionally, the first exhaust port 11321 is used to connect the first duct outlet 232 with the outside, and the second exhaust port is used to connect the air outlet side of the second fan 220 with the outside.

The switching channel member 240 has a first switching channel 241 and a second switching channel 242 that can be independent of each other. The switching channel member 240 is used to position the first fan 210 and the second fan 220 relative to the first switching channel 241 and the second switching channel 242 to switch between the serial connection state and the parallel connection state.

Optionally, the switching channel member 240 can rotate relative to the air duct member 230 to switch the positions of the first switching channel 241 and the second switching channel 242 relative to the first air duct inlet 2311, the second air duct inlet 2312, the first air duct outlet 232 and the second air duct outlet 233, thereby switching between the parallel connection state and the second connection state. Optionally, the switching can be manual or electric, so that the positions of the first switching channel 241 and the second switching channel 242 change, while the positions of the first fan 210, the second fan 220 and the air duct member 230 remain unchanged, thereby switching between the series connection state and the second connection state. Connected state and parallel connected state. By setting the switching channel member 240 to rotate relative to the air duct member 230 to switch the position relative to the first air duct inlet 2311, the second air duct inlet 2312, the first air duct outlet 232 and the second air duct outlet 233, different connected states are switched. The structure is simple, stable and reliable, the rotation method is simple and easy to implement, and the product implementation cost is low, which can make the switching of the parallel connected state and the series connected state more stable and faster.

Specifically, in the parallel connection state, the first air duct inlet 2311 is connected to the first air duct outlet 232 through the first switching channel 241, and the second air duct inlet 2312 is connected to the second air duct outlet 233 through the second switching channel 242, so that the first fan 210 and the second fan 220 are connected in parallel with each other, and each takes in and discharges air in parallel. In the series connection state, the first air duct inlet 2311 is connected to the second air duct outlet 233 through the second switching channel 242.

As shown in FIG3 , the duct member 230 may have a first air inlet 234, a second air inlet 235, a first air outlet 236, a second air outlet 237, and a third air outlet 238. The first air duct inlet 2311 is connected to the first air inlet 234. The second air duct inlet 2312 is connected to the second air inlet 235. The first air outlet 236 is connected to the first air duct outlet 232. The second air outlet 237 and the third air outlet 238 are connected to the second air duct outlet 233.

Optionally, the switching channel member 240 is used to switch the positions of the first switching channel 241 and the second switching channel 242 relative to the first air inlet duct 234 , the second air inlet duct 235 , the first air outlet duct 236 , the second air outlet duct 237 and the third air outlet duct 238 .

Specifically, in the parallel connection state, the first switching channel 241 connects the first air inlet 234 and the first air outlet 236, and the second switching channel 242 connects the second air inlet 235 and the third air outlet 238. In the parallel connection state, part of the airflow flowing out through the air outlet 122 flows sequentially through the air inlet and air outlet sides of the first fan 210, the first air duct inlet 2311, the first air inlet 234, the first switching channel 241, the first air outlet 236 and the first air duct outlet 232. Another part of the airflow flowing out through the air outlet 122 flows sequentially through the second air duct inlet 2312, the second air inlet 235, the second switching channel 242, the third air outlet 238, the air inlet and air outlet sides of the second fan 220.

In the serial connection state, the second switching channel 242 connects the first air inlet duct 234 and the second air outlet duct 237. In the serial connection state, the airflow flowing out through the air outlet 122 flows through the air inlet side and the air outlet side of the first fan 210, the first air duct inlet 2311, the second switching channel 242, the second air outlet duct 237, the air inlet side and the air outlet side of the second fan 220 in sequence.

The connection between the two fans is changed by connecting different switching channels with the air duct, the structure is simple and the switching is more convenient and quick.

As shown in FIG. 3 , the switching channel member 240 is rotatably disposed on the air duct member 230 , and the switching channel member 240 is used to switch the internal connection state of the air duct member 230 by rotation, thereby switching between the series connection state and the parallel connection state.

Furthermore, the air duct member 230 may also have a transition space 239. The switching channel member 240 is disposed in the transition space 239. The first air inlet duct 234, the second air inlet duct 235, the first air outlet duct 236, the second air outlet duct 237 and the third air outlet duct 238 are respectively connected to the transition space 239. Optionally, the switching channel member 240 is rotatably disposed in the transition space 239 so as to be able to rotate relative to the air duct 239. The air duct member 230 rotates, thereby switching the positions of the first switching channel 241 and the second switching channel 242 relative to the air duct member 230. Optionally, the switching channel member 240 is configured to rotate 180° relative to the air duct member 230, so that the air duct assembly 250 can be switched from a series connection state to a parallel connection state or from a parallel connection state to a series connection state.

As shown in FIG. 3 , the first switching channel 241 may be provided with a first opening 2411 and a second opening 2412, and the second switching channel 242 may be provided with a third opening 2421 and a fourth opening 2422. In the parallel connection state, the first opening 2411 is connected to the first air inlet 234, and the second opening 2412 is connected to the first air outlet 236. The third opening 2421 is connected to the second air inlet 235, and the fourth opening 2422 is connected to the third air outlet 238. In the series connection state, the fourth opening 2422 is connected to the first air inlet 234, and the third opening 2421 is connected to the second air outlet 237.

Optionally, the switching channel member 240 is arranged in a cylindrical shape, and the shape of the transfer space 239 matches the shape of the switching channel member 240. Optionally, the first switching channel 241 is arranged in a bent shape, and the second switching channel 242 is arranged in a linear extension. The first opening 2411 and the second opening 2412 are arranged in a staggered manner on the outer periphery of the switching channel member 240, the third opening 2421 and the fourth opening 2422 are arranged opposite to each other on the outer periphery of the switching channel member 240, and the first opening 2411, the second opening 2412, the third opening 2421 and the fourth opening 2422 are arranged at intervals along the circumference of the switching channel member 240. In other words, the first opening 2411, the second opening 2412, the third opening 2421 and the fourth opening 2422 are arranged at intervals on the circumference of the switching channel member 240, and the second opening 2412 is offset by 90° relative to the first opening 2411. In other words, the airflow directions of the first opening 2411 and the second opening 2412 are perpendicular to each other. The third opening 2421 and the fourth opening 2422 are arranged in a colinear manner.

Providing a transfer space 239 that matches the shape of the switching channel member 240 facilitates the connection and sealing of the air ducts in the parallel connection state and the series connection state, effectively reduces airflow leakage, can reduce fan power loss, and thus improves the running efficiency.

Specifically, in the parallel connection state, the switching channel member 240 can be rotated relative to the duct member 230 so that the first opening 2411 is connected to the first air inlet 234, the second opening 2412 is connected to the first air outlet 236, the third opening 2421 is connected to the second air inlet 235, and the fourth opening 2422 is connected to the third air outlet 238. In the series connection state, the switching channel member 240 is rotated relative to the duct member 230 so that the first opening 2411 is connected to the third air outlet 238, the second opening 2412 is staggered with the second air inlet 235, the second opening 2412 is blocked by the duct member 230, the third opening 2421 is connected to the second air outlet 237, and the fourth opening 2422 is connected to the first air inlet 234. The connection state of the two fans is switched by connecting different openings to the duct, the structure is simple, and the switching is convenient and fast. Among them, the openings that are not connected to the duct are blocked by the duct member 230, which effectively reduces airflow leakage. Based on the description of the above contents, the switching between the parallel connection state and the series connection state is exemplarily described below.

As shown in FIG3 and FIG4, the switching channel member 240 can switch the positions of the first switching channel 241 and the second switching channel 242 relative to the first fan 210 and the second fan 220 to switch between the parallel connection state and the series connection state. Further, the switching channel member 240 is used to switch the first switching channel 241 and the second switching channel 242 relative to the air duct inlet 231 and the first air duct outlet 231. The switching channel member 240 is used to switch the positions of the first switching channel 241 and the second switching channel 242 relative to the first air inlet 234, the second air inlet 235, the first air outlet 236, the second air outlet 237 and the third air outlet 238 by rotating relative to the air duct member 230.

(1) Parallel connection state

As shown in FIG3 , in the parallel connection state, the air outlet 122 is connected to the air inlet side of the first fan 210, and the air outlet side of the first fan 210 is connected to the first switching channel 241 through the first air duct inlet 2311 to connect to the first air duct outlet 232. The air outlet 122 is connected to the second air duct inlet 2312, and the second air duct inlet 231 is connected to the second switching channel 242 to connect to the second air duct outlet 233, and the second air duct outlet 233 is connected to the air inlet side of the second fan 220. In this way, the airflow entering the main unit 110 from the air outlet 122 and flowing into the fan assembly 200 is divided into two parts, one part passes through the air inlet side of the first fan 210, the air outlet side of the first fan 210, the first air duct inlet 2311 and the first switching channel 241 in sequence, and finally flows out from the first air duct outlet 232, and the other part passes through the second air duct inlet 2312, the second switching channel 242, the second air duct outlet 233 and the air inlet side of the second fan 220 in sequence, and finally flows out from the air outlet side of the second fan 220.

Specifically, in the parallel connection state, the first switching channel 241 is connected to the first air inlet 234 and the first air outlet 236, and the second switching channel 242 is connected to the second air inlet 235 and the third air outlet 238. Further, in the parallel connection state, the first opening 2411 is connected to the first air inlet 234, the second opening 2412 is connected to the first air outlet 236, the third opening 2421 is connected to the second air inlet 235, and the fourth opening 2422 is connected to the third air outlet 238.

In the parallel connection state, the airflow entering the host 110 from the air outlet 122 is divided into two parts, passing through the first fan 210 and the second fan 220 at the same time, and the first fan 210 and the second fan 220 are working in parallel. The air volume of a single fan is the amount of air flowing through the fan per unit time, and when the two fans work in parallel, the amount of air flowing through the fan assembly 200 per unit time increases, thereby providing a larger air volume for the surface cleaning device 1.

As shown in FIG5 , the static pressure-flow curve representing the operation of the dual fans in parallel and the static pressure-flow curve representing the operation of the single fan have intersections with the static pressure-flow curves of the high resistance system and the low resistance system, respectively. The static pressure and flow values corresponding to the intersections are the static pressure and flow values when the dual fans are in parallel and the single fan are in operation when they are in the high resistance system and the low resistance system, respectively. It can be seen from the figure that in the high resistance system and the low resistance system, the flow value corresponding to the dual fans in parallel is about twice that of the single fan, that is, when the two fans are in parallel, the surface cleaning device 1 is provided with about twice the air volume of the single fan.

Based on the above content, the working principle of the fan assembly 200 in the parallel connection state is described as follows:

The first fan 210 and the second fan 220 operate in parallel.

As shown in FIG3 , the fan assembly 200 is in a parallel connection state. The switching channel member 240 is rotated around a preset axis by manual or automatic operation. When in a parallel connection state, the first fan The air outlet side of the fan 210 is connected to the first air inlet 234 through the first air duct inlet 2311, the first air inlet 234 is connected to the first opening 2411 to connect to the first switching channel 241, the first switching channel 241 is connected to the first air outlet 236 through the second opening 2412, and the first air outlet 236 is connected to the first air duct outlet 232. The air duct inlet 231 is connected to the second air inlet 235, the second air inlet 235 is connected to the second switching channel 242 through the third opening 2421, the second switching channel 242 is connected to the third air outlet 238 through the fourth opening 2422, the third air outlet 238 is connected to the second air duct outlet 233, and the third air duct outlet is connected to the air inlet side of the second fan 220. In this way, the first fan 210, the first air inlet 234, the first switching channel 241 and the first air outlet 236 form a passage, and the second air inlet 235, the second switching channel 242, the third air outlet 238 and the second fan 220 form a passage.

In the parallel connection state, the airflow generated by the first fan 210 enters the fan assembly 200 from the air inlet side of the first fan 210, passes through the air outlet side of the first fan 210, the first air inlet 234, the first switching channel 241 and the first air outlet 236 in sequence, and flows out of the fan assembly 200 from the first air duct outlet 232. The airflow generated by the second fan 220 enters the fan assembly 200 from the air duct inlet 231, passes through the second air inlet 235, the second switching channel 242, the third air outlet 238, the second air duct outlet 233 and the air inlet side of the second fan 220 in sequence, and flows out of the fan assembly 200 from the air outlet side of the second fan 220. Therefore, the first fan 210 and the second fan 220 work in parallel to provide a larger air volume for the surface cleaning device 1.

(2) Series connection state

As shown in FIG4 , in the serial connection state, the air outlet 122 is connected to the air inlet side of the first fan 210, and the air outlet side of the first fan 210 is connected to the second switching channel 242 to connect to the second air duct outlet 233, and the second air duct outlet 233 is connected to the air inlet side of the second fan 220. In this way, the airflow entering the host 110 from the air outlet 122 and flowing into the fan assembly 200 passes through the air inlet side of the first fan 210, the air outlet side of the first fan 210, the second switching channel 242, the second air duct outlet 233 and the air inlet side of the second fan 220 in sequence, and finally flows out from the air outlet side of the second fan 220.

Specifically, in the serial connection state, the second switching channel 242 is connected to the first air inlet 234 and the second air outlet 237. Further, in the serial connection state, the first opening 2411 is connected to the third air outlet 238, the second opening 2412 is blocked by the air duct member 230, the third opening 2421 is connected to the second air outlet 237, and the fourth opening 2422 is connected to the first air inlet 234.

In the serial connection state, the airflow entering the main unit 110 from the air outlet 122 passes through the first fan 210 and the second fan 220 in sequence. At this time, the first fan 210 and the second fan 220 are connected end to end in sequence, and the fans work in series. The high-speed rotation of the fan provides centrifugal force for the air inside the fan, thereby generating static pressure. When the two fans work in series, they provide greater centrifugal force for the air in the same air flow channel, thereby providing greater static pressure for the surface cleaning device 1.

As shown in Figure 5, the static pressure-flow curve representing the dual-fan series operation and the static pressure-flow curve representing the single-fan operation have intersections with the static pressure-flow curves of the high resistance system and the low resistance system, respectively. The static pressure and flow values corresponding to the intersection are the static pressure and flow values of the dual-fan series operation and the single-fan operation in the high resistance system, respectively. The static pressure and flow rate values when operating in the high resistance system and the low resistance system. It can be seen from the figure that in the high resistance system and the low resistance system, the static pressure value corresponding to the series operation of the dual fans is about twice that of the single fan, that is, when the two fans work in series, the surface cleaning device 1 is provided with a static pressure about twice that of the single fan.

As shown in Figure 6, the curve composed of dotted lines in the figure is a computational fluid dynamics simulation analysis curve, which is a simulation analysis static pressure-air volume curve under different resistance systems when two fans are connected in series, and the curve composed of solid lines is a static pressure-air volume curve (PQ curve) obtained by actual measurement when two fans are running under different resistance systems, where the two curves correspond to fans with a total pressure of 8KPa and 4KPa, respectively. It can be seen from the figure that the simulation curves of the fans with a total pressure of 8KPa and 4KPa when the two fans are running in series are basically consistent with the actual curves, that is, the theoretical value of the embodiment of the present application is basically consistent with the actual value.

Based on the above content, the working principle of the fan assembly 200 in the series connection state is described as follows:

The first fan 210 and the second fan 220 operate in series.

As shown in FIG4 , the fan assembly 200 is in a serial connection state. The outlet side of the first fan 210 is connected to the first air inlet 234, the first air inlet 234 is connected to the fourth opening 2422 to connect to the second switching channel 242, the second switching channel 242 is connected to the second air outlet 237 through the third opening 2421, the third air outlet 238 is connected to the second air duct outlet 233, and the third air duct outlet is connected to the air inlet side of the second fan 220. Among them, the first switching channel 241 is connected to the third air outlet 238 through the first opening 2411, and the fourth opening 2422 is blocked by the air duct member 230. In this way, the first fan 210, the first air inlet 234, the second switching channel 242, the second air outlet 237 and the second fan 220 form a passage.

In the serial connection state, the airflow generated by the first fan 210 and the second fan 220 enters the fan assembly 200 from the air inlet side of the first fan 210, passes through the air inlet side of the first fan 210, the air outlet side of the first fan 210, the first air inlet duct 234, the second switching channel 242, the second air outlet duct 237 and the air inlet side of the second fan 220 in sequence, and flows out of the fan assembly 200 from the air outlet side of the second fan 220. Therefore, the first fan 210 and the second fan 220 work in series to provide a greater static pressure for the surface cleaning device 1.

Optionally, the above description states that the switching channel member 240 can rotate relative to the air duct member 230, and the aforementioned content also mentions that the switching can be achieved manually or automatically, that is, the relative rotation of the switching channel member 240 and the air duct member 230 can be achieved manually or automatically. As shown in Figures 7 and 8, in some embodiments, the air duct assembly 250 may include an operating portion 243, which is disposed on the switching channel member 240 and exposed to the device body 100. The operating portion 243 is used for the user to rotate to drive the switching channel member 240 to rotate. The operating portion 243 is, for example, a button or a handle. Specifically, the operating portion 243 is exposed through the device body 100, and is used for the user to twist the switching channel member 240 to rotate around a preset axis to switch between a parallel connection state and a series connection state. Optionally, the operating portion 243 is marked with a directional mark. As shown in Figure 7, the user can rotate the operating portion 243 so that the directional mark is located in the first position, and the fan assembly 200 is in a parallel connection state. As shown in Figure 8, the user can rotate the operating portion 243 so that the directional mark is located in the first position. The second position, at which time the fan assembly 200 is in a serial connection state. In other embodiments, the air duct assembly 250 further includes a driving unit (not shown), which is disposed on the device body 100, for example, it can be disposed on the host 110, or it can be disposed on the trash bin 120. The driving unit is in transmission connection with the switching channel member 240, and the driving unit is used to drive the switching channel member 240 to rotate. The driving unit is, for example, a motor, a cylinder, or an electromagnetic device.

Optionally, the surface cleaning device 1 detects the resistance encountered when sucking garbage objects, and adaptively switches between the parallel connection state and the series connection state, so as to intelligently meet the needs of sucking different garbage objects, that is, when the suction resistance is small, the fans are connected in parallel to provide a larger air volume, and when the suction resistance is large, the fans are switched to be connected in series to provide a larger static pressure, so as to adapt to different needs. The surface cleaning device 1 adopts a parallel connection state to make the suction faster when sucking the same amount of dust, and adopts a series connection state to make the suction power greater when sucking objects with the same resistance. In addition, the fan has a maximum efficiency point in theory, and the maximum efficiency point has its corresponding air volume and static pressure, that is, when the air volume and static pressure provided by the fan are the values corresponding to the maximum efficiency point, the operating efficiency of the fan is the highest, and when the air volume and static pressure provided by the fan are values within the range near the air volume and static pressure corresponding to the maximum efficiency point, the range is called the high efficiency zone of the fan. A single fan has only one high-efficiency zone, while a fan assembly 200 using two fans connected in parallel or in series has two high-efficiency zones, and the high-efficiency zone is wider, and the efficiency of the surface cleaning device 1 is higher. In addition, when the fan generates air kinetic energy, air watts can be used to measure the power. Air watts is positively correlated with static pressure and air volume. Therefore, using a structure in which two fans are connected in parallel or in series can increase the air watts of the fan assembly 200, and effectively improve the cleaning efficiency of the surface cleaning device 1.

In some embodiments, the surface cleaning device 1 can be in a parallel connection state when the cleaning operation starts, and when the resistance encountered when sucking garbage objects increases to a certain threshold, the fan assembly 200 is switched to a series connection state to provide a greater static pressure.

Optionally, as shown in Figure 9, the switching channel component 240 adopts a two-color injection molding process, including an inner layer component 244 and an outer layer component 245, wherein the inner layer component 244 is made of acrylonitrile-butadiene-styrene copolymer (ABS) or polycarbonate (PC) + acrylonitrile-butadiene-styrene copolymer (ABS) for support, and the outer layer component 245 is made of thermoplastic polyurethane elastomer (TPU) 50° soft glue for sealing.

Further, as shown in Fig. 10, the host 110 includes an upper housing 112 and a lower housing 113 connected to each other. The first fan 210, the second fan 220, the air duct member 230 and the switching channel member 240 are arranged between the upper housing 112 and the lower housing 113, and the first fan 210, the second fan 220 and the air duct member 230 are fixedly connected to the lower housing 113.

As shown in Figure 11, the host 110 is also provided with a first pair of interfaces 1101, a second pair of interfaces 1102 and a third pair of interfaces 1103. The first pair of interfaces 1101 is connected to the air outlet 122, the second pair of interfaces 1102 and the third pair of interfaces 1103 are both connected to the first pair of interfaces 1101, the second pair of interfaces 1102 is connected to the air inlet side of the first fan 210, and the third pair of interfaces 1103 is connected to the second air duct inlet 2312.

As shown in FIG11 , the first docking port 1102, the second docking port 1102 and the third docking port 1103 are arranged in the lower housing 113. The lower housing 113 is provided with a first fan accommodating position 1133 and a second fan accommodating position 1134. The first fan 210 is accommodated in the first fan accommodating position 1133 and the air inlet side of the first fan 210 faces the lower housing 113, an air inlet gap is provided between the air inlet side of the first fan 210 and the lower housing 113, the second docking port 1102 is connected to the air inlet gap, and the air duct inlet 231 is connected to the air inlet side of the first fan 210 through the air inlet gap. The second fan 220 is accommodated in the second fan accommodating position 1134, the air outlet side of the second fan 220 faces the lower housing 113 and there is an exhaust gap with the lower housing 113, so that the exhaust airflow of the air outlet side of the second fan 220 flows out to the outside through the exhaust gap. Specifically, the air outlet 122 is connected to the first docking port 1101, and the airflow flowing out through the first docking port 1101 enters the air duct member 230 through the second docking port 1102 and the first fan 210, and enters the air duct member 230 through the third docking port 1103. The first fan 210 and the second fan 220 are respectively accommodated in the first fan accommodation position 1133 and the second fan accommodation position 1134, and are interconnected through the air duct member 230 and the switching channel member 240, which effectively reduces the structural volume of the fan assembly 200 and facilitates assembly, disassembly and maintenance in the actual production process.

In summary, the above-mentioned embodiments are provided with a device body 100 with a garbage bin 120, and the suction power is provided by the fan assembly 200, and garbage objects are sucked from the dust suction port 1131. The airflow enters the main unit 110 through the air outlet 122, and an air duct assembly 250 is provided, so as to switch the state between the first fan 210 and the second fan 220. The switching of the working mode between the first fan 210 and the second fan 220 can be realized quickly and effectively, so as to provide a larger air volume for the surface cleaning device 1 in the parallel connection state, and provide a larger static pressure for the surface cleaning device 1 in the series connection state, thereby increasing the air wattage of the fan assembly 200, so that the surface cleaning device 1 can adapt to more cleaning scenes and improve the cleaning efficiency.

The above description is only an embodiment of the present application and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

A surface cleaning device, comprising:

The device body includes a main unit and a trash can, wherein the main unit is provided with a dust suction port, the trash can is provided on the main unit, the trash can has a dust inlet, a receiving cavity and an air outlet, the dust inlet is connected with the dust suction port, the dust inlet and the air outlet are both connected with the receiving cavity, and the airflow flowing from the dust inlet into the receiving cavity flows out through the air outlet;

A first fan and a second fan are arranged in the device body and are used to generate airflow;

an air duct assembly, arranged on the equipment body, connecting the first fan and the second fan, and having a series connection state and a parallel connection state that can be switched between each other;

Wherein, the air duct component is configured to connect the outlet side of the first fan with the inlet side of the second fan in the series connection state, so that the air flow flowing out of the air outlet flows through the inlet side of the first fan, the outlet side of the first fan, the inlet side of the second fan and the outlet side of the second fan in sequence; in the parallel connection state, the inlet side of the first fan and the inlet side of the second fan are connected in parallel, and the outlet side of the first fan and the outlet side of the second fan are connected in parallel, so that part of the air flow flowing out of the air outlet flows through the inlet side and the outlet side of the first fan, and the other part flows through the inlet side and the outlet side of the second fan.
The surface cleaning device according to claim 1, characterized in that

The air duct assembly includes an air duct member and a switching channel member. The air duct member is connected to the equipment body and docked with the first fan and the second fan. The switching channel member is arranged on the air duct member and is used to switch the internal connectivity state of the air duct member, thereby switching the series connectivity state and the parallel connectivity state.
The surface cleaning device according to claim 2, characterized in that

The air duct member has a first air duct inlet, a second air duct inlet, a first air duct outlet and a second air duct outlet, the first air duct inlet is connected to the air outlet side of the first fan, the second air duct outlet is connected to the air inlet side of the second fan, and the air outlet is connected to the air inlet side of the first fan and the second air duct inlet;

The switching channel member has a first switching channel and a second switching channel which are independent of each other; the switching channel member is used to switch the positions of the first switching channel and the second switching channel relative to the first fan and the second fan;

Wherein, in the parallel connection state, the first air duct inlet is connected to the first air duct outlet through the first switching channel; the second air duct inlet is connected to the second air duct outlet through the second switching channel; in the series connection state, the first air duct inlet is connected to the second air duct outlet through the second switching channel.
The surface cleaning device according to claim 3, characterized in that:

The air duct member has a first air inlet, a second air inlet, a first air outlet, a second air outlet and a third air outlet; the first air duct inlet is connected to the first air inlet; the second air inlet is connected to the first air duct The air duct is connected to the second air duct inlet, the first air outlet is connected to the first air duct outlet, and the second air outlet and the third air outlet are connected to the second air duct outlet respectively;

Wherein, the switching channel member is used to switch the positions of the first switching channel and the second switching channel relative to the first air inlet channel, the second air inlet channel, the first air outlet channel, the second air outlet channel and the third air outlet channel;

In the parallel connection state, the first switching channel connects the first air inlet and the first air outlet, and the second switching channel connects the second air inlet and the third air outlet; in the series connection state, the second switching channel connects the first air inlet and the second air outlet.
The surface cleaning device according to claim 4, characterized in that:

The air duct member has a transfer space, and the switching channel member is arranged in the transfer space;

The first switching channel has a first opening and a second opening, and the second switching channel has a third opening and a fourth opening;

In the parallel connection state, the first opening is connected to the first air inlet, the second opening is connected to the first air outlet, the third opening is connected to the second air inlet, and the fourth opening is connected to the third air outlet;

In the serial connection state, the third opening is connected to the second air outlet, and the fourth opening is connected to the first air inlet.
The surface cleaning device according to claim 3, characterized in that:

The first switching channel is bent, and the second switching channel extends linearly.
The surface cleaning device according to claim 6, characterized in that:

The first switching channel has a first opening and a second opening, the second switching channel has a third opening and a fourth opening, the first opening, the second opening, the third opening and the fourth opening are spaced apart in the circumferential direction of the switching channel member, the second opening is offset by 90° relative to the first opening, and the third opening and the fourth opening are collinearly arranged.
The surface cleaning device according to claim 3, characterized in that:

The host is further provided with a first air outlet and a second air outlet, wherein the first air outlet is used to connect the first air duct outlet with the outside, and the second air outlet is used to connect the air outlet side of the second fan with the outside.
The surface cleaning device according to claim 3, characterized in that:

The host is also provided with a first pair of interfaces, a second pair of interfaces and a third pair of interfaces, the first pair of interfaces is connected to the air outlet, the second pair of interfaces and the third pair of interfaces are both connected to the first pair of interfaces, the second pair of interfaces is connected to the air inlet side of the first fan, and the third pair of interfaces is also connected to the second air duct inlet.
The surface cleaning device according to claim 2, characterized in that:

The switching channel member is rotatably disposed on the air duct member, and the switching channel member is used to switch the internal connection state of the air duct member by rotating, thereby switching the series connection state and the parallel connection state.
The surface cleaning device according to claim 10, characterized in that:

The switching channel member is used to rotate 180° relative to the air duct member so as to switch the air duct assembly from the series connection state to the parallel connection state or from the parallel connection state to the series connection state.
The surface cleaning device according to claim 10 or 11, characterized in that:

The air duct assembly further includes an operating portion, which is disposed on the channel switching component and exposed from the device body. The operating portion is used for being rotated by a user to drive the channel switching component to rotate.
The surface cleaning device according to claim 10 or 11, characterized in that:

The air duct assembly further includes a driving part, which is disposed on the device body and is transmission-connected to the switching channel component, and is used to drive the switching channel component to rotate.
The surface cleaning device according to claim 2, characterized in that:

The switching channel member is located between the first fan and the second fan.
The surface cleaning device according to claim 2, characterized in that:

The switching channel member is located at a side of the main unit away from the dust suction port.
The surface cleaning device according to claim 1, characterized in that:

The first fan and the second fan are detachably connected to the device body.
The surface cleaning device according to claim 1, characterized in that:

The device body includes a driving mechanism and a walking wheel mechanism, which are transmission-connected to each other and are arranged on the main unit; the driving mechanism is used to drive the walking wheel mechanism to move on the area to be cleaned, and the dust suction port is arranged so that at least part of it can be directed toward the area to be cleaned, so that the airflow formed by the first fan and/or the second fan can suck the garbage objects on the area to be cleaned into the trash bin through the dust suction port.