Surface cleaning device

Abstract

The invention discloses a surface cleaning device which comprises a cleaning main machine which comprises a shell, a liquid supply box and a dirty liquid recycling box. The shell is provided with a connector, and the connector is provided with a first butt joint part which is in fluid communication with the dirty liquid recycling box and a second butt joint part which is in fluid communication with the liquid supply box; the external extension pipe assembly comprises a cleaning head provided with a suction nozzle and a liquid outlet, a joint provided with a third butt joint part and a fourth butt joint part, and a hose; the valve is arranged in the bypass channel, one end of the bypass channel is in fluid communication with a fluid channel of the liquid supply box and the liquid outlet, the other end of the bypass channel is in fluid communication with a suction channel from the suction nozzle to the dirty liquid recycling box, and the valve is provided with an opening position enabling the bypass channel to be in a closed state and a closing position enabling the bypass channel to be in a cut-off state; the valve is configured for a user to operate the bypass passage in an open position. By operating the valve, the cleaning liquid passage is communicated with the suction passage, so that foreign matters which cause that the cleaning liquid cannot be normally discharged are sucked away.

Description

Technical Field

[0001] The present application relates to the technical field of cleaning equipment, and in particular to a surface cleaning device for cleaning a surface such as a floor. Background Art

[0002] A surface cleaning device, such as a floor scrubber, a carpet cleaner, etc., which can wet clean a surface to be cleaned using a cleaning liquid; wherein the cleaning liquid is stored in a cleaning liquid supply container and is continuously applied to the floor through a liquid output path during the cleaning process; the applied cleaning liquid together with the cleaned dirt (which may include dirt, dust, stains, mud, hair and other debris) will be transferred to a dirty liquid receiving container by a suction motor during the cleaning process.

[0003] The work of applying cleaning liquid to the ground is usually driven by a pump arranged in the liquid output path. Sometimes, due to insufficient power of the pump, or air mixed into the liquid output path or blockage by foreign matter, the cleaning liquid in the cleaning liquid supply container cannot be normally or continuously supplied to the surface to be cleaned, which will make the device unable to continue working and affect the user's use. Summary of the invention

[0004] In order to solve the problem of unstable sewage suction in the prior art, the purpose of the present application is to provide a surface cleaning device that effectively ensures that the cleaning liquid can be smoothly supplied to the surface to be cleaned.

[0005] To achieve the above-mentioned object, the present application adopts the following first technical solution on one hand: a surface cleaning device, comprising a cleaning main unit and an external extension tube assembly detachably attached to the main unit; The cleaning host comprises a shell having an upright handle assembly and a base, a cleaning liquid supply assembly and a dirty liquid recovery assembly; the cleaning liquid supply assembly comprises a liquid supply tank, a first liquid outlet located at the base, and a first liquid channel located between the liquid supply tank and the first liquid outlet; the dirty liquid recovery assembly comprises a first suction nozzle located at the base, a dirty liquid recovery tank, a first suction channel located between the dirty liquid recovery tank and the first suction nozzle, and a suction motor connected to the fluid of the dirty liquid recovery tank; the shell provides an interface, which is provided with a first docking portion connected to the dirty liquid recovery tank by fluid and a second docking portion connected to the liquid supply tank by fluid, a third liquid channel is provided between the second docking portion and the liquid supply tank, a mechanical pump assembly is arranged in the third liquid channel, the mechanical pump assembly comprises a motor and a pump body, and the motor is connected to the pump shaft of the pump body by driving; The external extension tube assembly includes a cleaning head provided with a second suction nozzle and a second liquid outlet, a joint provided with a third docking portion and a fourth docking portion, a hose located between the joint and the cleaning head, a second suction channel extending from the third docking portion to the second suction nozzle, and a second liquid channel extending from the fourth docking portion to the second liquid outlet; the joint is configured to achieve fluid communication between the first docking portion and the third docking portion and fluid communication between the second docking portion and the fourth docking portion after being engaged with the interface; A bypass channel and a first valve arranged in the bypass channel are provided at the cleaning main unit and / or the external extension tube assembly. One end of the bypass channel is fluidically connected to the second liquid channel or the third liquid channel, and the other end is fluidically connected to the first suction channel or the second suction channel. The first valve has an open position that puts the bypass channel in a passage state and a closed position that puts the bypass channel in a cut-off state; the first valve is configured to allow a user to operate the bypass channel in the open position.

[0006] In a specific embodiment, the interface is located at the base.

[0007] In a specific embodiment, the interface is constructed to meet the requirements for inserting the connector from top to bottom.

[0008] In a specific embodiment, the base includes a cover, and the cover is configured to close and open the interface.

[0009] In a specific embodiment, the cleaning host includes a brush assembly, the mechanical pump assembly and the brush assembly are both arranged at the base, and the brush assembly is arranged in a transmission manner with the motor.

[0010] In a specific embodiment, the liquid supply tank and the dirty liquid recovery tank are both located at the upright handle assembly.

[0011] In a specific embodiment, a second valve is arranged in the first liquid channel, the second valve is connected to a trigger transmission and is opened and closed by the trigger, and the trigger is arranged at the upright handle assembly.

[0012] In a specific embodiment, the first valve is a mechanical valve and includes a movable valve core and an operating member for a user to actuate the valve core.

[0013] In a specific embodiment, the first valve is arranged at the joint.

[0014] In a specific embodiment, a third valve is provided at the second docking portion, and the third valve has a first state for blocking the fluid in the liquid supply tank from flowing out of the second docking portion and a second state for allowing the fluid in the liquid supply tank to flow out of the second docking portion, and the third valve is constructed to be actuated to switch from the first state to the second state when the connector is inserted into the interface.

[0015] On the other hand, the present application adopts the following second technical solution: a surface cleaning device, comprising: A cleaning liquid supply assembly, comprising a liquid supply box, a liquid outlet, and a liquid channel between the liquid supply box and the liquid outlet; A dirty liquid recovery component, comprising a suction nozzle, a dirty liquid recovery tank, a suction channel between the dirty liquid recovery tank and the suction nozzle, and a suction motor in fluid communication with the dirty liquid recovery tank; A bypass channel, one end of which is fluidically connected to the liquid channel, and the other end of which is fluidically connected to the suction channel; A valve is arranged in the bypass channel, the first valve has an open position that puts the bypass channel in a passage state and a closed position that puts the bypass channel in a cut-off state, and the valve is configured to allow a user to operate the bypass channel in the open position.

[0016] In a specific embodiment, the surface cleaning device further comprises: a mechanical pump assembly, which is arranged in the liquid channel and comprises a motor and a pump body, wherein the motor is drivingly connected to a pump shaft of the pump body.

[0017] In a specific embodiment, the surface cleaning device further comprises: a brush assembly, and the brush assembly is configured to be driven by the motor.

[0018] In a specific embodiment, the pump body has an inlet and an outlet, the liquid channel includes an upstream channel located between the liquid supply tank and the inlet and a downstream channel located between the outlet and the outlet, and one end of the bypass channel is fluidically connected to the downstream channel.

[0019] In a specific embodiment, the surface cleaning device further includes: a first shell; and a second shell detachably attached to the first shell, the suction motor, liquid supply tank, dirty liquid recovery tank and mechanical pump assembly are arranged on the first shell, and the suction nozzle, liquid outlet and valve are arranged on the second shell.

[0020] In a specific embodiment, the valve is a mechanical valve and includes a movable valve core and an operating member for a user to actuate the valve core.

[0021] Compared with the prior art, the present application achieves the following beneficial effects: the present application sets a bypass channel and a valve arranged in the bypass channel, and the valve is configured to allow the user to operate the bypass channel to be in the open position; thereby, when the cleaning liquid passage cannot normally output the cleaning liquid due to the blockage of foreign matter (such as air, large particles of impurities, etc.), the user can operate this valve to connect the cleaning liquid passage with the suction passage, thereby utilizing the powerful suction capacity of the suction passage to suck away the foreign matter that prevents the cleaning liquid from being discharged normally, so that the corresponding liquid outlet can output liquid normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional schematic diagram of a surface cleaning device provided in an embodiment of the present application; Figure 2 for Figure 1 A first schematic diagram of the surface cleaning device after removing the external extension tube assembly, part of the base and part of the upright handle assembly; Figure 3 To see from another angle Figure 2 A schematic diagram of a surface cleaning device in; Figure 4 for Figure 2 A schematic diagram of a surface cleaning device connected to an external extension tube assembly; Figure 5 for Figure 3 A schematic diagram of a surface cleaning device connected to an external extension tube assembly; Figure 6 A cross-sectional view of a connector provided in an embodiment of the present application; wherein the valve is in a closed position; Figure 7 for Figure 6 Schematic diagram of the connector in the valve in the open position; Among them: 100, cleaning host; 200, external extension tube assembly; 11, shell; 12, base; 2, cleaning liquid supply assembly; 13, upright handle assembly; 21, liquid supply box; 22, liquid outlet; 23, liquid channel; 24, valve; 14, trigger; 15, interface; 151, docking part; 152, docking part; 25, liquid channel; 4, mechanical pump assembly; 41, motor; 42, pump body; 421, inlet; 422, outlet; 251, upstream channel; 252, downstream channel channel; 3. dirty liquid recovery component; 31. suction nozzle; 32. dirty liquid recovery box; 33. suction channel; 34. suction motor; 331. upper channel; 332. lower channel; 5. brush assembly; 6. cleaning head; 61. suction nozzle; 62. liquid outlet; 7. connector 71. docking part; 72. docking part; 8. hose; 81. suction channel; 82. liquid channel; 91. bypass channel; 92. valve; 921. valve core; 922. operating member; 923. spring; 73. inner cavity; 153. valve. DETAILED DESCRIPTION

[0023] To describe the technical content, structural features, achieved purpose and effect of the application in detail, the technical solutions in the embodiments of the application will be described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all of the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the application. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the technical concept of the application, the specific shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0024] like Figure 1-5 The surface cleaning device shown in the figure is composed of a vertical cleaning main unit 100 and an external extension tube assembly 200 detachably attached to the cleaning main unit 100. When the external extension tube assembly 200 is not connected, the cleaning main unit 100 can move on the ground (such as a carpet surface) alone to perform ground cleaning operations; when the external extension tube assembly 200 is connected, the cleaning main unit 100 and the external extension tube assembly 200 work together to achieve cleaning operations on surfaces such as sofas and furniture.

[0025] The cleaning host 100 is a vertical cleaning device, including a housing 1, wherein the housing 1 has an upright handle assembly 13 with a handle 11 at the upper portion and a base 12 at the lower portion, wherein the lower portion of the upright handle assembly 13 is rotatably connected to the base 12. The user can carry the entire cleaning host 100 to move back and forth on the ground by manipulating the upright handle assembly 13.

[0026] The cleaning host 100 includes a cleaning liquid supply assembly 2, which can continuously supply cleaning liquid to the surface to be cleaned. The cleaning liquid supply assembly 2 includes a liquid supply tank 21 located at the upright handle assembly 13, a liquid outlet 22 located at the lower part of the base 12, and a liquid channel 23 located between the liquid supply tank 21 and the liquid outlet 22. A valve 24 is arranged in the liquid channel 23, and the valve 24 is transmission-connected to the trigger 14 located at the handle 11. The user can control the valve 24 to open and close by pulling the trigger 14, thereby controlling whether the cleaning liquid flows to the liquid outlet 22.

[0027] The upper portion of the base 12 provides an interface 15, and the interface 15 is provided with a docking portion 151 and a docking portion 152. The interface 15 is also provided with a cover (not shown in the figure), and the cover is configured to be able to close and open the interface 152.

[0028] The cleaning liquid supply assembly 2 also includes a liquid channel 25 between the liquid supply box 21 and the docking portion 151, and a mechanical pump assembly 4 is arranged on the path of the liquid channel 25. The mechanical pump assembly 4 includes a motor 41 and a pump body 42, and the motor 41 is drivingly connected to the pump shaft of the pump body 42. The pump body 42 has an inlet 421 and an outlet 422. The liquid channel 25 includes an upstream channel 251 between the liquid supply box 21 and the inlet 421 and a downstream channel 252 between the outlet 422 and the docking portion 151.

[0029] The cleaning host 100 includes a dirty liquid recovery component 3, which can suck up dirt on the surface to be cleaned and recover the cleaning liquid applied to the surface to be cleaned. The dirty liquid recovery component 3 includes a suction nozzle 31 located at the base 12, a dirty liquid recovery tank 32 located at the housing 11, a suction channel 33 located between the dirty liquid recovery tank 32 and the suction nozzle 31, and a suction motor 34 connected to the fluid of the dirty liquid recovery tank 32. The docking portion 152 is located in the path of the suction channel 33, and the suction channel 33 includes an upper channel 331 located between the docking portion 152 and the dirty liquid recovery tank 32 and a lower channel 332 located between the docking portion 152 and the suction nozzle 31.

[0030] The cleaning host 100 includes a brush assembly 5. The mechanical pump assembly 4 and the brush assembly 5 are both arranged at the base 12. The brush assembly 5 is arranged in a transmission manner with the motor 41. In this example, the brush assembly 5 is located at the rear side of the suction nozzle 31, and the mechanical pump assembly 4 is located at the rear side of the brush assembly 5.

[0031] The external extension tube assembly 200 includes a cleaning head 6 provided with a suction nozzle 61 and a liquid outlet 62, a connector 7 provided with a docking portion 71 and a docking portion 72, a hose 8 located between the connector 7 and the cleaning head 6, a suction channel 81 extending from the docking portion 71 to the suction nozzle 61, and a liquid channel 82 extending from the docking portion 72 to the liquid outlet 62.

[0032] The connector 7 is configured to be inserted into the interface 15; in this embodiment, the interface 15 is configured to be inserted into the connector 7 from top to bottom. After the connector 7 is engaged with the interface 15, the docking portion 151 is in fluid communication with the docking portion 72, and the docking portion 152 is in fluid communication with the docking portion 71; at this time, the lower channel 332 is blocked, the upper channel 331 of the suction channel 33 is in fluid communication with the suction channel 81, and the suction nozzle 61 of the cleaning head 6 is in fluid communication with the dirty liquid recovery tank 32.

[0033] like Figure 6-7 As shown, the external extension tube assembly 200 further includes a bypass channel 91 and a valve 92 arranged in the bypass channel 91. One end of the bypass channel 91 is fluidically connected to the liquid channel 82, and the other end is fluidically connected to the suction channel 81. The valve 92 has an open position that makes the bypass channel 91 in a passage state and a closed position that makes the bypass channel 91 in a cutoff state. The valve 92 is configured to be able to be operated by a user to open the bypass channel 91.

[0034] The valve 92 is a mechanical valve and includes a movable valve core 921 and an operating member 922 for a user to actuate the valve core 921. With the action of the valve core 921, the valve 92 can be switched between an open position and a closed position, so that the bypass channel 91 is in a passage state or a cut-off state. In other embodiments, the valve 92 can also be replaced by other types of valves, such as an electronic valve.

[0035] In this example, the valve 92 is arranged at the joint 7, and the valve core 921 is supported on the inner wall of the bypass channel 91 by a spring 923, and the inner cavity 73 constitutes a part of the liquid channel 82. The operating member 922 is a pressing member and is exposed. The user can press the operating member 922 downward to push the valve core 921 to switch the valve 92 to the open position, and the suction channel 81 and the liquid channel 82 are fluidically connected through the bypass channel 91; after the user releases the operating member 922, the valve core 921 will be reset under the action of the spring 923, and the valve 92 will be switched to the closed position, and the suction channel 81 and the liquid channel 82 are not connected.

[0036] In other embodiments, the bypass channel and the valve may also be arranged on the cleaning host, such as at the base; their function is to facilitate the connection of the liquid channel with the suction channel when needed, so as to utilize the powerful suction force of the suction motor to directly suck the air, foreign matter, etc. in the liquid channel from the liquid channel into the suction channel, thereby ensuring that the liquid channel remains unobstructed at all times.

[0037] like Figure 3As shown, a valve 153 is provided at the docking portion 151, and the valve 153 has a first state that blocks the liquid in the liquid supply box 21 from flowing out of the docking portion 151 and a second state that allows the fluid in the liquid supply box 21 to flow out of the docking portion 151. The valve 153 is configured to be actuated to switch from the first state to the second state when the connector 15 is inserted into the interface 7. The valve 153 is preferably a one-way valve, which is also configured to automatically switch from the second state to the first state when the connector 15 is separated from the interface 7, such as an elastic reset member is provided in the valve 153.

[0038] Typically, a valve (not shown in the figure) is also arranged at the cleaning head 6 of the external extension tube assembly 200 to control whether liquid is discharged from the liquid outlet 62. This valve is preferably a mechanical valve. When the user uses the external extension tube assembly 200 for cleaning operations, the user can use this valve to pause the output of liquid from the liquid outlet 62.

[0039] When the cleaning host 100 is not connected to the external extension tube assembly 200 and works alone, the user holds the handle of the upright handle assembly 13 and pushes the base 12 to move on the ground; turns on the power switch, the suction motor 34 and the motor 41 are started, and the trigger 14 is pulled to open the valve 24, and the cleaning liquid in the liquid supply tank 21 will flow directly to the liquid outlet 22 and be applied to the ground; at this time, the motor 41 drives the brush assembly 5 to rub and scrub on the ground, and the suction nozzle 31 sucks up the dirt on the ground and the dirty cleaning liquid after scrubbing, and sends them to the dirty liquid recovery tank 32 through the lower channel 332, the docking part 152 and the upper channel 331.

[0040] When the cleaning host 100 is connected to the external extension tube assembly 200 for operation, the docking portion 151 and the docking portion 72 are fluidly connected, the docking portion 152 and the docking portion 71 are fluidly connected, the valve 153 is opened, the liquid channel 25 and the liquid channel 82 connecting the liquid supply tank 21 and the liquid outlet 62 are connected, the suction path connecting the suction nozzle 61 to the dirty liquid recovery tank 32 is connected, the suction channel 81, the docking portion 152 and the upper channel 331 are fluidly connected in sequence, and the fluid channel between the lower channel 322 and the upper channel 331 is blocked; start the power switch, the suction motor 34 and the motor 41 are started, and the cleaning liquid in the liquid supply tank 21 is usually sent out by the action of the mechanical pump assembly 4. Enters the liquid outlet 62 and is applied to the surface to be cleaned; at this time, the suction nozzle 61 sucks up the dirt on the surface to be cleaned and the dirty cleaning liquid after use, and sends them to the dirty liquid recovery tank 32 through the suction channel 81, the docking part 152 and the upper channel 331; during this cleaning process, if the user presses the operating member 932, the valve 92 is opened, and the foreign matter or air in the liquid channel 25, the liquid channel 82 and the pump body 42 will be directly sucked into the suction channel 81, and finally sent to the dirty liquid recovery tank 32; if the user releases the operating member 932, the cleaning liquid in the liquid supply tank 21 will be sent to the liquid outlet 62 again under the action of the mechanical pump assembly 4.

[0041] In the present application, a strong suction force in the dirty liquid recovery path is utilized to directly suck away foreign matter, air, and other substances in the cleaning liquid output path that affect the output of the cleaning liquid to the liquid outlet. In addition, since the valve connecting the two paths is controllable by the user, the user can choose to operate it when the water outlet is not flowing smoothly.

[0042] The technical solution of the present application can be applied not only to vertical cleaning devices, but also to horizontal, handheld and other cleaning equipment.

[0043] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and the scope of protection required by the present application is defined by the attached claims, description and their equivalents.

Claims

1. A surface cleaning device, comprising a cleaning main unit and an external extension tube assembly detachably attached to the main unit; The cleaning host comprises a shell having an upright handle assembly and a base, a cleaning liquid supply assembly and a dirty liquid recovery assembly; the cleaning liquid supply assembly comprises a liquid supply tank, a first liquid outlet located at the base, and a first liquid channel located between the liquid supply tank and the first liquid outlet; the dirty liquid recovery assembly comprises a first suction nozzle located at the base, a dirty liquid recovery tank, a first suction channel located between the dirty liquid recovery tank and the first suction nozzle, and a suction motor connected to the fluid of the dirty liquid recovery tank; the shell provides an interface, which is provided with a first docking portion connected to the dirty liquid recovery tank by fluid and a second docking portion connected to the liquid supply tank by fluid, a third liquid channel is provided between the second docking portion and the liquid supply tank, a mechanical pump assembly is arranged in the third liquid channel, the mechanical pump assembly comprises a motor and a pump body, and the motor is connected to the pump shaft of the pump body by driving; The external extension tube assembly includes a cleaning head provided with a second suction nozzle and a second liquid outlet, a joint provided with a third docking portion and a fourth docking portion, a hose located between the joint and the cleaning head, a second suction channel extending from the third docking portion to the second suction nozzle, and a second liquid channel extending from the fourth docking portion to the second liquid outlet; the joint is constructed to achieve fluid communication between the first docking portion and the third docking portion and fluid communication between the second docking portion and the fourth docking portion after being engaged with the interface; it is characterized in that A bypass channel and a first valve arranged in the bypass channel are provided at the cleaning main unit and / or the external extension tube assembly. One end of the bypass channel is fluidically connected to the second liquid channel or the third liquid channel, and the other end is fluidically connected to the first suction channel or the second suction channel. The first valve has an open position that puts the bypass channel in a passage state and a closed position that puts the bypass channel in a cut-off state; the first valve is configured to allow a user to operate the bypass channel in the open position.

2. The surface cleaning device according to claim 1, characterized in that The interface is located at the base.

3. The surface cleaning device according to claim 2, characterized in that The interface is constructed to meet the requirements for inserting the connector from top to bottom.

4. The surface cleaning device according to claim 2, characterized in that The base includes a cover, and the cover is configured to close and open the interface.

5. The surface cleaning device according to claim 1, characterized in that The cleaning host comprises a brush assembly. The mechanical pump assembly and the brush assembly are both arranged at the base. The brush assembly is arranged in a transmission manner with the motor.

6. The surface cleaning device according to claim 1, characterized in that The liquid supply tank and the dirty liquid recovery tank are both located at the upright handle assembly.

7. The surface cleaning device according to claim 1, characterized in that A second valve is arranged in the first liquid channel. The second valve is connected to a trigger and is opened and closed by the trigger. The trigger is arranged at the upright handle assembly.

8. The surface cleaning device according to claim 1, characterized in that The first valve is a mechanical valve and includes a movable valve core and an operating member for a user to actuate the valve core.

9. The surface cleaning device according to claim 1, characterized in that The first valve is arranged at the joint.

10. The surface cleaning device according to claim 1, characterized in that A third valve is provided at the second docking portion, and the third valve has a first state for blocking the fluid in the liquid supply box from flowing out of the second docking portion and a second state for allowing the fluid in the liquid supply box to flow out of the second docking portion. The third valve is constructed to be actuated to switch from the first state to the second state when the connector is inserted into the interface.

11. A surface cleaning device, characterized in that: include: A cleaning liquid supply assembly, comprising a liquid supply box, a liquid outlet, and a liquid channel between the liquid supply box and the liquid outlet; A dirty liquid recovery assembly, comprising a suction nozzle, a dirty liquid recovery tank, a suction channel between the dirty liquid recovery tank and the suction nozzle, and a suction motor in fluid communication with the dirty liquid recovery tank; A bypass channel, one end of which is fluidically connected to the liquid channel, and the other end of which is fluidically connected to the suction channel; A valve is arranged in the bypass channel, the first valve has an open position that puts the bypass channel in a passage state and a closed position that puts the bypass channel in a cut-off state, and the valve is configured to allow a user to operate the bypass channel in the open position.

12. The surface cleaning device according to claim 11, characterized in that Also includes: The mechanical pump assembly is arranged in the liquid channel and comprises a motor and a pump body, wherein the motor is drivingly connected to a pump shaft of the pump body.

13. The surface cleaning device according to claim 12, characterized in that Also includes: A brush assembly is arranged in a transmission manner with the motor.

14. The surface cleaning device of claim 12, wherein: The pump body has an inlet and an outlet, the liquid channel includes an upstream channel between the liquid supply box and the inlet and a downstream channel between the outlet and the outlet, and one end of the bypass channel is fluidically connected to the downstream channel.

15. The surface cleaning device of claim 11, wherein: Also includes: a first shell; And a second shell detachably attached to the first shell, the suction motor, liquid supply tank, dirty liquid recovery tank and mechanical pump assembly are arranged on the first shell, and the suction nozzle, liquid outlet and valve are arranged on the second shell.

16. The surface cleaning device of claim 11, wherein: The valve is a mechanical valve and comprises a movable valve core and an operating member for a user to actuate the valve core.

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