A method for cleaning the pipeline of a surface cleaning device

Abstract

The present application provides a pipeline cleaning method for a surface cleaning device, which is applied to a surface cleaning device. The surface cleaning device includes a cleaning component, a sewage suction motor, a sewage storage bucket, a sewage suction port, and a sewage suction pipeline connecting the sewage storage bucket and the sewage suction port; at least part of the sewage suction pipeline is a threaded pipeline with a threaded inner wall. The pipeline cleaning method of the surface cleaning device includes: an immersion cleaning stage: controlling the sewage suction motor to operate at a first power, the first power varying within a first preset range, or the first power remaining at a first preset value; wherein the first power is less than the operating power of the sewage suction motor when the surface cleaning device performs a cleaning task, so that the liquid flow moving in the sewage suction pipeline forms multiple spiral liquid flows after impact to immerse and clean the sewage suction pipeline. The present application effectively avoids the phenomenon of dirt residue in the sewage suction pipeline after cleaning, and fully ensures the cleaning effect of the sewage suction pipeline.

Description

Technical Field

[0001] The present application relates to the technical field of cleaning equipment, and particularly relates to a pipeline cleaning method for a surface cleaning device. Background Art

[0002] With the improvement of people's living standards, surface cleaning devices such as floor scrubbers are increasingly widely used in people's daily lives. As the cleaning process progresses, dirt adheres to the inner wall of the sewage suction pipeline, and it is easy to emit an unpleasant smell over time. Therefore, to solve the above problems, it is necessary to clean the sewage suction pipeline in a timely manner.

[0003] In the prior art, by continuously shutting down the sewage suction motor, or by making the sewage suction motor generate a dynamically changing suction force, the cleaning liquid reciprocates in the sewage suction pipeline to clean the sewage suction pipeline. In addition, when the liquid flow reciprocates in the sewage suction pipeline, two liquid flows moving in opposite directions collide in the sewage suction pipeline to form a scouring force, and this scouring force is used to clean the sewage suction pipeline.

[0004] However, in the above methods, the flow rate of the cleaning liquid is relatively fast, and the contact time with the dirt on the inner wall of the sewage suction pipeline is relatively short. Only the dirt slightly attached to the inner wall of the sewage suction pipeline can be removed, and the stubbornly attached dirt cannot be removed, which leads to dirt residue in the sewage suction pipeline. Further, the flow rate of the cleaning liquid is relatively fast, and it cannot fully infiltrate the sewage suction pipeline. At the same time, it will also cause some cleaning liquid to rush out of the sewage suction pipeline and enter the sewage bucket under the action of inertia, resulting in waste of the cleaning liquid. In addition, when using the scouring force generated by the collision of two liquid flows in the sewage suction pipeline to clean the sewage suction pipeline, the impact position is uncertain, which leads to the possibility of an unimpacted area in the sewage suction pipeline. This situation will also cause dirt residue in the sewage suction pipeline.

[0005] In summary, when using the cleaning method in the prior art to clean the sewage suction pipeline, dirt residue is likely to appear in the sewage suction pipeline, the cleaning effect is poor, and the cleaning liquid is wasted seriously, greatly reducing the user experience. Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a pipeline cleaning method for a surface cleaning device, which effectively avoids incomplete cleaning of the sewage suction pipeline and dirt residue in the sewage suction pipeline after cleaning, and fully ensures the cleaning effect of the sewage suction pipeline.

[0007] On the one hand, the present application provides a pipeline cleaning method for a surface cleaning device, which is applied to a surface cleaning device. The surface cleaning device includes a cleaning component, a sewage suction motor, a sewage bucket, a sewage suction port, and a sewage suction pipeline connecting the sewage bucket and the sewage suction port; at least part of the sewage suction pipeline is a threaded pipeline with a threaded inner wall; the pipeline cleaning method of the surface cleaning device includes:

[0008] Soaking and cleaning stage: Control the sewage suction motor to operate at a first power, where the first power varies within a first preset range or remains at a first preset value. The first power is less than the operating power of the sewage suction motor when the surface cleaning device performs a cleaning task, so that the liquid flow moving in the sewage suction pipe forms multiple spiral liquid flows after impact to soak and clean the sewage suction pipe.

[0009] Preferably, the power of the sewage suction motor is adjusted by controlling the duty cycle of the sewage suction motor. The sewage suction motor is controlled to alternate between two constant values within the range of 20%-60% in terms of duty cycle, so that within one cycle of the change of the duty cycle of the sewage suction motor, there are at least some periods when the spiral liquid flow soaking the sewage suction pipe and the liquid flows colliding and moving in different directions coexist to soak and clean the sewage suction pipe; or, the spiral liquid flow soaking the sewage suction pipe and the liquid flows colliding and moving in the same direction coexist to soak and clean the sewage suction pipe.

[0010] Preferably, the sewage suction motor is controlled to change periodically from large to small within the range of 20%-60% in terms of duty cycle, so that within one cycle of the change of the duty cycle of the sewage suction motor, there are at least some periods when the spiral liquid flow soaking the sewage suction pipe and the liquid flows colliding and moving in different directions coexist to soak and clean the sewage suction pipe.

[0011] Preferably, the sewage suction motor is controlled to change periodically from small to large within the range of 20%-60% in terms of duty cycle, so that within one cycle of the change of the duty cycle of the sewage suction motor, there are at least some periods when the spiral liquid flow soaking the sewage suction pipe and the liquid flows colliding and moving in the same direction coexist to soak and clean the sewage suction pipe.

[0012] Preferably, the threaded pipe is a bent section communicating with the sewage suction port, and the pitch on the inner wall of the threaded pipe changes due to the bend, so that at least part of the liquid flow collides with the bent threaded pipe and turns when flowing through the bent section.

[0013] Preferably, the surface cleaning device further includes a liquid supply assembly, and the method for cleaning the pipeline of the surface cleaning device further includes:

[0014] In the soaking and cleaning stage, control the liquid supply assembly to supply liquid intermittently.

[0015] Preferably, the method for cleaning the pipeline of the surface cleaning device further includes:

[0016] Rinsing stage: Control the sewage suction motor to operate at a second power so that the liquid flow reciprocates along the sewage suction pipe under the suction of the sewage suction motor to scour the sewage suction pipe. The second power varies within a second preset range or remains at a second preset value.

[0017] Preferably, the power change range of the sewage suction motor corresponding to the first preset range is smaller than the power change range of the sewage suction motor corresponding to the second preset range, and the second power is greater than the first power.

[0018] Preferably, the pipeline cleaning method of the surface cleaning device further includes: alternately performing a soaking cleaning stage and a flushing stage.

[0019] Preferably, the pipeline cleaning method of the surface cleaning device further includes:

[0020] Sewage suction step: controlling the sewage suction motor to operate at a third power so that the cleaning liquid in the sewage suction pipeline is sucked into the sewage storage bucket, wherein the third power is greater than the first power.

[0021] The beneficial effects of this application compared with the prior art are as follows: At least part of the sewage suction pipeline is a threaded pipeline with a threaded inner wall. By adjusting the operating power of the sewage suction motor, the cleaning liquid slowly climbs upward along the inner wall of the sewage suction pipeline in a spiral liquid flow manner after entering the sewage suction pipeline, reducing the flow velocity of the cleaning liquid flow, increasing the contact time between the liquid flow and the inner wall of the sewage suction pipeline, enabling the cleaning liquid flow to closely contact the dirt adhering to the inner wall of the sewage suction pipeline, fully soaking the sewage suction pipeline, and then reducing the adhesion force of the dirt to the sewage suction pipeline through soaking, so as to soften or remove the dirt adhering to the inner wall of the sewage suction pipeline and improve the cleaning effect of the sewage suction pipeline. Secondly, the spiral liquid flow in this application will also collide in the sewage suction pipeline, locally scouring the inner wall of the sewage suction pipeline through the collision; Therefore, it can be seen that the cleaning liquid in this application can not only soak the dirt but also impact and scour the dirt, further removing the dirt and ensuring the cleaning effect. In addition, after the spiral liquid flow collides, a single-strand spiral liquid flow will be divided into multiple-strand spiral liquid flows, enabling multiple-strand spiral liquid flows to simultaneously infiltrate and clean the sewage suction pipeline in the sewage suction pipeline at the same time, realizing the soaking and cleaning of the entire sewage suction pipeline, and effectively avoiding the phenomenon of incomplete cleaning and dirt residue in the sewage suction pipeline. In addition, because the cleaning liquid in this application slowly climbs in a spiral liquid flow manner and has a slow flow velocity, when the liquid supply amount is certain, adopting this scheme to clean the sewage suction pipeline can increase the contact area and contact time between the cleaning liquid and the pipe wall of the sewage suction pipeline, improve the utilization rate of the cleaning liquid, and enable better cleaning effects with less cleaning liquid. In addition, by adjusting the power of the sewage suction motor, the cleaning liquid reciprocates in the sewage suction pipeline to repeatedly infiltrate and clean the sewage suction pipeline, which makes the cleaning liquid not escape from the sewage suction pipeline into the sewage storage bucket under the action of inertia, but will reciprocate in the sewage suction pipeline, greatly saving the use of the cleaning liquid.

[0022] In another embodiment, the pipeline cleaning method in the present application further includes a flushing stage. In the flushing stage, by adjusting the operating power of the sewage suction motor, the cleaning liquid can continuously scour the sewage suction pipeline at a relatively fast flow rate after entering the sewage suction pipeline. In practical applications, relatively firm dirt may adhere to the inner wall of the sewage suction pipeline, and it may be difficult to remove all the dirt only by soaking. Therefore, in the present application, to ensure the cleaning effect, an immersion cleaning stage and a flushing stage are set at the same time, so that the sewage suction pipeline with adhered dirt can be cleaned through at least two processes of soaking and scouring, ensuring that the dirt adhering to the inner wall of the sewage suction pipeline can be completely removed, fully avoiding the phenomenon of dirt residue in the sewage suction pipeline, and improving the cleaning effect on the sewage suction pipeline.

[0023] In summary, the present application effectively avoids the phenomenon of dirt residue in the sewage suction pipeline after cleaning, fully ensuring the cleaning effect on the sewage suction pipeline. At the same time, the present application also saves the use of the cleaning liquid and improves the utilization rate of the cleaning liquid. All of the above improve the user experience and increase the market competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below.

[0025] Figure 1 It is a schematic structural diagram of a surface cleaning device provided by an embodiment of the present application;

[0026] Figure 2 It is a schematic flow chart of a pipeline cleaning method of a surface cleaning device provided by an embodiment of the present application;

[0027] Figure 3 It is a schematic diagram of the flow of the cleaning liquid in the sewage suction pipeline provided by an embodiment of the present application;

[0028] Figure 4 It is a schematic diagram of the flow of the cleaning liquid in the sewage suction pipeline provided by an embodiment of the present application;

[0029] Figure 5 It is a schematic structural diagram of a surface cleaning device provided by another embodiment of the present application.

[0030] Reference Numerals in the Drawings:

[0031] 1 - Body; 11 - Water Tank; 12 - Sewage Bucket; 13 - Sewage Suction Motor; 14 - Sewage Suction Pipeline; 15 - Sewage Suction Port; 2 - Floor Brush; 21 - Cleaning Assembly; 22 - Liquid Spraying Port; 23 - Installation Cavity; 3 - Base; 100 - Surface Cleaning Device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following will describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application.

[0033] Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0034] Please refer to Figure 1 , which is a schematic structural diagram of a surface cleaning device 100 provided in an embodiment of the present application. As Figure 1 shown, this embodiment provides a surface cleaning device 100, which is used to clean the surface to be cleaned on the ground; wherein, the surface cleaning device 100 includes a body 1 and a floor brush 2 pivotally connected to the body 1. As Figure 1 shown, an installation cavity 23 is provided on the floor brush 2, and a cleaning component 21 for cleaning the surface to be cleaned is provided in the installation cavity 23. The cleaning component 21 can be a roller brush or a track-type cleaning member, etc.; a dirt suction port 15 is provided on the floor brush 2, a sewage bucket 12 and a dirt suction motor 13 are provided on the body 1, and a dirt suction pipe 14 is also provided on the surface cleaning device 100; the dirt suction motor 13 is used to suck the dirt formed after cleaning through the dirt suction port 15 and the dirt suction pipe 14 into the sewage bucket 12. At least part of the dirt suction pipe 14 is a threaded pipe with a threaded inner wall. Further, the threaded pipe with a threaded inner wall is provided at the pivot connection between the body 1 and the scrubber 2 and is communicated with the dirt suction port 15.

[0035] In one embodiment, the surface cleaning device 100 in the present application further includes a control component and a liquid supply component; wherein, the liquid supply component includes a water tank 11 provided on the body 1, a liquid spraying port 22 provided on the floor brush 2, and a liquid supply pipe for connecting the water tank 11 and the liquid spraying port 22. The liquid supply component is used to discharge cleaning liquid to the surface to be cleaned or the cleaning component 21 when the surface cleaning device 100 performs a cleaning task, so as to facilitate the cleaning component 21 to clean the surface to be cleaned; the control component is provided in the body 1, and the control component is connected to the cleaning component 21, the liquid supply component, and the dirt suction motor 13. The control component is used to control the operating states of the cleaning component 21, the dirt suction motor 13, and the liquid supply component.

[0036] Please refer to Figure 2 , which is a schematic flowchart of a pipeline cleaning method for the surface cleaning device 100 provided in an embodiment of the present application. As Figure 2As shown, the method at least includes a soaking and cleaning stage S210; wherein, in the soaking and cleaning stage S210: control the sewage suction motor 13 to operate at a first power, the first power varies within a first preset range, or the first power remains at a first preset value; wherein, the first power is less than the operating power of the sewage suction motor when the surface cleaning device performs a cleaning task, so that after the liquid flow moving in the sewage suction pipe collides, multiple spiral liquid flows are formed to soak and clean the sewage suction pipe.

[0037] Among them, the first power is less than the operating power of the sewage suction motor 13 when the surface cleaning device 100 performs a cleaning task. Specifically, in actual use, the surface cleaning device 100 has multiple cleaning modes for performing cleaning tasks, and each cleaning mode may match different operating powers of the sewage suction motor 13. The common point of the operating power of the sewage suction motor 13 when performing a cleaning task is that the dirt sucked by the sewage suction port 15 can be discharged through the sewage suction pipe 14 under the suction force of the sewage suction motor 13 and stored in the sewage storage bucket 12. Therefore, in this embodiment, the first power being less than the operating power of the sewage suction motor 13 when the surface cleaning device 100 performs a cleaning task means that the first power should be less than the operating power of the sewage suction motor 13 in all cleaning modes. By this setting, the liquid flow sucked into the sewage suction pipe 14 does not directly enter the sewage storage bucket 12, and the flow time of the liquid flow in the sewage suction pipe 14 is extended to fully soak and clean the sewage suction pipe 14. Exemplarily, the surface cleaning device 100 may have a standard cleaning mode and a heavy dirt cleaning mode. The standard cleaning mode is used for general cleaning, and the heavy dirt cleaning mode is used for cleaning the ground with more dirt; if the rated power of the sewage suction motor 13 is 110 - 130W, the operating power of the sewage suction motor 13 in the standard cleaning mode is 70 - 80W, the operating power of the sewage suction motor 13 in the heavy dirt cleaning mode is 90 - 100W, and the first power can be 10 - 60W.

[0038] In this stage, when cleaning the sewage suction pipe 14, the control component executes the soaking and cleaning stage S210. When starting to execute the soaking and cleaning stage S210, the control component controls the sewage suction motor 13 to start and operate at the first power. When the sewage suction motor 13 is operating, a suction force is generated, and under the action of the suction force and the threaded pipe with a threaded inner wall, the cleaning liquid is sucked into the sewage suction pipe 14 in the form of a spiral liquid flow. As Figure 3As shown, the clean liquid flow sucked into the sewage suction pipe 14 slowly climbs upward along the inner wall of the sewage suction pipe 14 in the form of a spiral liquid flow, and soaks the inner wall of the sewage suction pipe 14 while climbing. After climbing a certain distance, part of the liquid flow flows downward under the action of gravity to soak the pipe wall again without directly escaping; at this time, since the sewage suction motor 13 continues to generate suction force, while part of the liquid flow flows downward under the action of gravity, there is also a liquid flow flowing from bottom to top under the action of suction force in the sewage suction pipe 14, which causes the above-mentioned descending liquid flow to collide with the upward flowing liquid flow during the descending process. After the collision, the spiral liquid flow is forced to turn, and the original single spiral liquid flow climbing upward is divided into multiple spiral liquid flows, and the multiple spiral liquid flows have a certain climbing spacing between them, and climb upward along the inner wall of the sewage suction pipe 14, and soak the inner wall of the sewage suction pipe 14 while climbing. When the multiple spiral liquid flows climb to the limit position, the liquid flows downward under the action of gravity. After descending a certain distance, the descending liquid flow collides with the upwardly climbing liquid flow. After the collision, the original upwardly climbing liquid flow is divided into multiple spiral liquid flows, and the multiple spiral liquid flows continue to climb upward to soak the inner wall of the sewage suction pipe 14; or, the first power changes within the first preset range, so that the liquid flows with the same or opposite movement directions collide in the sewage suction pipe 14, and the spiral liquid flows climb upward to soak the sewage suction pipe 14. At the same time, the liquid flows moving in different movement directions or the same movement direction will also partially collide with the inner wall of the sewage suction pipe 14 when colliding. After the local collision, the liquid flow at the collision position presents a turbulent or torrent form, which can flush the sewage suction pipe 14. The position where the liquid flow collides and the position where the multiple spiral liquid flows are formed after the collision are uncertain, so that the entire sewage suction pipe 14 can be fully cleaned. In the above manner, multiple spiral liquid flows reciprocate in the sewage suction pipe 14 to soak the sewage suction pipe 14, and at the same time, soak and rinse the inner wall of the sewage suction pipe 14. The above process is continuously circulated until the soaking and cleaning process of the sewage suction pipe 14 is completed.

[0039] In addition, only part of the single-strand spiral liquid flow climbing upward will collide with the descending liquid flow. The liquid flow that does not collide with the descending liquid flow will continue to climb upward along the inner wall of the sewage suction pipe 14 under the action of the suction force. After part of the upward liquid flow collides, it will be forced to turn under the triple action of gravity, impact force and the suction force of the sewage suction motor 13, and after being forced to turn, it will continue to climb upward along the inner wall of the sewage suction pipe 14 in the form of a spiral liquid flow; part of the descending liquid flow is transformed into an ascending liquid flow, converges with the spiral ascending liquid flow, and after convergence, they will climb upward along the inner wall of the sewage suction pipe 14 together in the form of a spiral liquid flow; the original single-strand ascending liquid flow and the descending liquid flow form a new spiral ascending liquid flow at the impact point and climb upward along the inner wall of the sewage suction pipe 14; after part of the liquid flow collides, it first moves downward for a certain distance under the action of gravity and then climbs upward in the form of a spiral liquid flow under the action of the suction force; after part of the liquid flow collides, it first continues to move downward under the action of gravity, and during the movement, it encounters another upward climbing liquid flow and collides again, and then climbs upward along the inner wall of the sewage suction pipe 14. After the liquid flows moving in different directions collide in the sewage suction pipe 14, the movement direction of the liquid flow changes according to the above method, converting the original single-strand upward flowing spiral liquid flow into multiple spiral liquid flows. Due to factors such as the different positions where the different spiral liquid flows are generated after the collision, a climbing distance will be formed between the multiple spiral liquid flows flowing in the sewage suction pipe 14 after the collision.

[0040] As Figure 4 shown, Figure 4 the solid spiral line in it is the original single-strand ascending spiral liquid flow; Figure 4 the straight line in it is the descending liquid flow; the dotted spiral line is the multiple spiral liquid flows generated after part of the ascending liquid flow collides with the descending liquid flow. The newly generated multiple spiral liquid flows after the collision and the spiral liquid flows that do not collide climb upward at a certain climbing distance to soak the sewage suction pipe 14.

[0041] It should be noted that:

[0042] 1. When the surface cleaning device 100 performs a cleaning task, the sewage suction motor 13 operates at a certain set operating power. At this time, the liquid flow that enters the sewage suction pipe 14 under the suction of the sewage suction motor 13 will be directly sucked into the sewage bucket 12 through the liquid outlet. Among them, the liquid outlet is provided at the top of the sewage suction pipe 14, and the sewage suction pipe 14 is communicated with the sewage bucket 12 through the liquid outlet. However, in this embodiment, when cleaning the sewage suction pipe 14, the operating power (the first power) of the sewage suction motor 13 is less than the above set operating power, and the suction force generated by the sewage suction motor 13 is relatively small. When the cleaning liquid flow is sucked into the sewage suction pipe 14, it will slowly climb upward along the inner wall of the sewage suction pipe 14 in the form of a spiral liquid flow. When it climbs to the limit position at a certain distance from the liquid outlet, the liquid flow can no longer continue to climb upward, but will flow downward under the action of gravity; at the same time, due to the suction force of the sewage suction motor 13, the downward flowing cleaning liquid flow will not flow out of the body 1 either, but will flow back and forth in the sewage suction pipe 14. During the process of flowing back and forth, the cleaning liquid continuously soaks and cleans the sewage suction pipe 14.

[0043] 2. The limit position that the spiral liquid flow can climb to in the sewage suction pipe 14 is related to the operating power of the sewage suction motor 13. The greater the operating power of the sewage suction motor 13, the closer the limit position is to the liquid outlet, and the longer the climbing distance of the spiral liquid flow; the smaller the operating power of the sewage suction motor 13, the farther the limit position is from the liquid outlet, and the shorter the climbing distance of the spiral liquid flow. Exemplarily, when the length of the sewage suction pipe 14 is L and the operating power of the sewage suction motor 13 is 50W - 60W, the climbing height of the spiral liquid flow in the sewage suction pipe 14 can be 0.9L - 0.95L.

[0044] 3. The spiral liquid flow refers to the liquid flow form in which the liquid flow presents a spiral upward shape around the inner wall of the sewage suction pipe 14 during the climbing process.

[0045] As can be seen from the above embodiments, in the soaking and cleaning stage of the present application, by adjusting the operating power of the sewage suction motor 13, the cleaning liquid slowly climbs upward along the inner wall of the sewage suction pipe 14 in the form of a spiral liquid flow after entering the sewage suction pipe 14, reducing the flow velocity of the cleaning liquid flow, increasing the contact time between the liquid flow and the inner wall of the sewage suction pipe 14, enabling the cleaning liquid flow to closely contact the dirt adhering to the inner wall of the sewage suction pipe 14, fully soaking the sewage suction pipe 14, and then reducing the adhesion force of the dirt to the sewage suction pipe 14 through soaking, achieving softening or removing the dirt adhering to the inner wall of the sewage suction pipe 14, and improving the cleaning effect on the sewage suction pipe 14. Secondly, the spiral liquid flow in the present application will also collide in the sewage suction pipe 14, locally scouring the inner wall of the sewage suction pipe 14 through the collision; therefore, it can be seen that the cleaning liquid in the present application can impact and scour the dirt while soaking the dirt, greatly ensuring the cleaning effect on the dirt.

[0046] Furthermore, after the spiral liquid flow collides, one spiral liquid flow will be divided into multiple spiral liquid flows. The multiple spiral liquid flows can repeatedly soak the same position of the sewage suction pipe 14 at different times during the upward climbing process. At the same time, due to a certain climbing distance between the multiple spiral liquid flows, the existence of this climbing distance enables the multiple spiral liquid flows to soak different positions on the inner wall of the sewage suction pipe 14 at the same time. In addition, compared with the single liquid flow soaking once, the multiple spiral liquid flows increase the soaking time of the sewage suction pipe 14 when soaking simultaneously, improving the soaking effect on the sewage suction pipe 14, achieving full and uniform soaking of the inner wall of the sewage suction pipe 14, and effectively avoiding the phenomenon of dirt residue in the sewage suction pipe 14.

[0047] In addition, since the cleaning liquid in the present application slowly climbs in the form of a spiral liquid flow and has a slow flow velocity, this enables the cleaning liquid not to escape from the sewage suction pipe 14 into the sewage bucket 12 under the action of inertia, but to flow back and forth in the sewage suction pipe 14. This method greatly saves the use of the cleaning liquid, while prolonging the residence time of the cleaning liquid in the sewage suction pipe 14 and the number of times of soaking the sewage suction pipe 14, and improving the cleaning effect. In addition, when two cleaning liquid flows with opposite movement directions collide, part of the cleaning liquid flow flowing downward can merge into the cleaning liquid flow flowing upward and continue to flow upward with the cleaning liquid flow flowing upward. This method also saves the use of the cleaning liquid. Therefore, it can be seen from the above content that the present application saves the use of the cleaning liquid, can achieve a good soaking and cleaning effect with less cleaning liquid, and improves the cleaning efficiency of the sewage suction pipe 14.

[0048] In summary, the present application effectively avoids the phenomenon of dirt residue in the sewage suction pipeline 14 after cleaning, fully ensuring the cleaning effect of the sewage suction pipeline 14. At the same time, the present application also saves the use of cleaning liquid and improves the utilization rate of the cleaning liquid. All of the above enhance the user experience and increase the market competitiveness of the product.

[0049] In one embodiment, during the soaking and cleaning stage S210, the operating power of the sewage suction motor 13, i.e., the first power, can be maintained at a first preset value, or the first power can vary within a first preset range. When the first power is different, the movement form of the cleaning liquid flowing back and forth in the sewage suction pipeline 14 will be different, and the execution process of the soaking and cleaning stage S210 will also be different. Below, for different value cases of the first power, the liquid flow situation in the soaking and cleaning stage S210 will be introduced:

[0050] ① The first power is maintained at the first preset value. Exemplarily, when the rated power of the sewage suction motor 13 is 110 - 130 W, the surface cleaning device 100 has a standard cleaning mode and a heavy dirt cleaning mode, the operating power of the sewage suction motor 13 in the standard cleaning mode is 70 - 80 W, and the operating power of the sewage suction motor 13 in the heavy dirt cleaning mode is 90 - 100 W, the first preset value can be 10 - 60 W.

[0051] As an implementation manner of this embodiment, the motor is controlled to operate at a constant power of 20 W, and the specific operation steps are as follows:

[0052] First, the control component controls the sewage suction motor 13 to start and controls the sewage suction motor 13 to operate at an operating power of 20 W after starting. Then, the sewage suction motor 13 sucks the cleaning liquid into the sewage suction pipeline 14; after successful suction, the cleaning liquid slowly climbs upward along the inner wall of the sewage suction pipeline 14 in the form of a spiral liquid flow; when it climbs to a height of 0.9L, the liquid flow flows downward under the action of gravity. Here, L is the length of the sewage suction pipeline 14. The descending liquid flow will collide with the ascending liquid flow during the descending process. After the collision, the spiral liquid flow is forced to turn, and the original single - strand ascending liquid flow is divided into multiple spiral liquid flows, and the multiple spiral liquid flows climb upward simultaneously to soak the sewage suction pipeline 14. At the same time, the spiral liquid flows in different movement directions will locally impact the inner wall of the sewage suction pipeline 14 after the collision, which enables the impact force generated by the liquid flow to wash the sewage suction pipeline 14 while the spiral liquid flow climbs upward to soak the sewage suction pipeline 14, and the sewage suction pipeline 14 is soaked and cleaned in this way.

[0053] ② The first power varies within the first preset range. There are various situations where the first power varies within the first preset range. In this embodiment, the power of the sewage suction motor is adjusted by controlling the duty cycle of the sewage suction motor.

[0054] The duty cycle of the sewage suction motor varies within the range of 20%-60%. Exemplarily, the duty cycle of the sewage suction motor 13 can vary within the range of 20%-60% in the form of a sine wave or a stepped wave. Alternatively, during operation, the duty cycle of the sewage suction motor is controlled to alternately vary between two constant values within the range of 20%-60%.

[0055] Exemplarily, by adjusting the duty cycle of the sewage suction motor, the power of the sewage suction motor changes, causing multiple helical liquid flows to enter the sewage suction pipe 14 and climb along the inner wall of the sewage suction pipe 14 to soak and clean the inner wall of the sewage suction pipe 14. Each liquid flow climbs to the limit position and then moves downward under the action of gravity. During the downward movement, it collides with the upward helical liquid flow, causing the liquid flow to be re-divided. The multiple helical liquid flows formed after the collision have a certain climbing spacing and start to climb upward from different positions under the action of the suction force to repeatedly soak and clean the inner wall of the sewage suction pipe 14. At the same time, the helical liquid flows in different moving directions will also locally impact the inner wall of the sewage suction pipe 14 after the collision. After the local impact, the liquid flow at the impact point presents a turbulent or rapid flow state, which can achieve the flushing of the sewage suction pipe 14. At the same time, due to the change in the power of the sewage suction motor 13, the moving speed of the upward flowing helical liquid flow will also change. The change in the moving speed causes small fluctuations in the helical liquid flow, and when the helical liquid flow fluctuates, it will also slightly clean the inner wall of the sewage suction pipe 14. In addition, due to the different ways of changing the duty cycle of the sewage suction motor 13, the forms and positions of the liquid flow collisions are also different. In addition to the collisions of the helical liquid flows moving in different directions within the sewage suction pipe 14, the helical liquid flows moving in the same direction can also collide to locally flush the inner wall of the sewage suction pipe 14. Specifically, due to the continuous change in the power of the sewage suction motor 13, the liquid flow inhaled into the sewage suction pipe 14 later may have a faster liquid flow rate than the liquid flow that entered earlier, causing the latter helical liquid flow to impact the former helical liquid flow among the two upward moving helical liquid flows, causing part of the impacted liquid flow to turn and form new multiple liquid flows. The multiple liquid flows climb upward simultaneously to repeatedly soak and clean the sewage suction pipe 14, and at the same time, a turbulent or rapid flow state is formed when the two liquid flows collide to flush the inner wall of the sewage suction pipe 14.

[0056] The following describes several forms of adjusting the duty cycle of the sewage suction motor 13:

[0057] Solution 1: As an implementation method in this embodiment, the power of the sewage suction motor is controlled to change from large to small. Specifically, the method of controlling the power of the sewage suction motor to change from large to small can be to control the duty cycle of the sewage suction motor to periodically change from large to small between 50% and 30%, or to control the duty cycle of the sewage suction motor to change between these two constant values of 50% and 30%.

[0058] The control component controls the sewage suction motor 13 to start and controls the sewage suction motor 13 to operate at a first power after starting. During the operation, it controls the duty cycle of the sewage suction motor to periodically change from large to small between 50% and 30%, or controls the duty cycle of the sewage suction motor to change between the two constant values of 50% and 30% during the operation. If the duty cycle of the sewage suction motor 13 is initially 50%, the first liquid flow is sucked into the sewage suction pipe 14. After successful suction, the first liquid flow slowly climbs upward along the inner wall of the sewage suction pipe 14 in the form of a spiral liquid flow; when it climbs to a certain height, the first liquid flow flows downward under the action of gravity; at this time, when the duty cycle of the sewage suction motor 13 becomes 30%, the second liquid flow is sucked into the sewage suction pipe 14, and the second liquid flow climbs upward along the inner wall of the sewage suction pipe 14 in the form of a spiral liquid flow and soaks the inner wall of the sewage suction pipe 14 while climbing. During the climbing process of the second spiral liquid flow, part of the liquid flow in the second liquid flow collides with the descending first liquid flow. The liquid flow that does not collide continues to climb upward along the inner wall of the sewage suction pipe 14. After the collision, the second liquid flow is divided into multiple spiral liquid flows, and the multiple spiral liquid flows climb upward at the same time to soak the inner wall of the sewage suction pipe 14. When the multiple spiral liquid flows climb to a certain height, they flow downward under the action of gravity. After that, when the liquid flow drops to a certain position, the descending liquid flow collides with the ascending liquid flow again, and the liquid flow repeatedly infiltrates and flushes the inner wall of the sewage suction pipe 14 in the sewage suction pipe 14. During at least a certain period within a cycle of the change in the duty cycle of the sewage suction motor, there are simultaneously spiral liquid flows soaking the sewage suction pipe 14 and liquid flows colliding and moving in different directions to soak and clean the sewage suction pipe 14. Due to the change in the power of the sewage suction motor, the position of each liquid flow collision is different each time, and the liquid flow climbing along the sewage suction pipe 14 climbs slowly and reciprocates, which increases the contact time between the cleaning liquid and the sewage suction pipe 14, improves the utilization rate of the cleaning liquid, saves the cleaning liquid, and achieves thorough cleaning of the sewage suction pipe 14 at the same time.

[0059] Solution 2: As an implementation method in this embodiment, the power of the sewage suction motor is controlled to change from small to large; specifically, the method of controlling the power of the sewage suction motor to change from small to large can be to control the duty cycle of the sewage suction motor to periodically change from small to large between 40% and 60%, or to control the duty cycle of the sewage suction motor to change between the two constant values of 40% and 60%.

[0060] For easy understanding, the following examples are used to illustrate the control method for soaking and cleaning the sewage suction pipe 14 and the cleaning effect produced in this embodiment:

[0061] The control component controls the sewage suction motor 13 to start and controls the duty cycle of the sewage suction motor to vary cyclically from small to large between 40% and 60% during operation, or controls the duty cycle of the sewage suction motor to vary between two constant values of 40% and 60% during operation, so that the power of the sewage suction motor 13 correspondingly varies from small to large. When the power of the sewage suction motor 13 varies from small to large within the preset range, the climbing speed of the liquid flow inhaled at a higher power is faster, while the previous liquid flow gradually decreases in climbing speed under the action of resistance due to having climbed up a certain distance. The second liquid flow that climbs up rapidly will collide with the previous liquid flow that is also in the rising state during the rising process. After the collision, the two liquid flows become multiple spiral liquid flows. The multiple spiral liquid flows continue to climb upward along the inner wall of the sewage suction pipe 14 at a certain climbing interval and soak the inner wall of the sewage suction pipe 14 while climbing. Specifically, during the movement process, the head of the second liquid flow can collide with the middle or tail of the first liquid flow. At the same time, when the collision occurs, while the spiral liquid flow climbs upward and soaks the sewage suction pipe 14, it will also locally impact the inner wall of the sewage suction pipe 14. After the local impact, the liquid flow at the impact point presents a turbulent or rapid flow form, and this form can achieve the flushing of the sewage suction pipe 14; in addition, when the operating power of the sewage suction motor 13 changes, the movement speed of the spiral liquid flow will also change. The change in the movement speed causes small fluctuations in the spiral liquid flow, and when the spiral liquid flow fluctuates, it will also slightly clean the inner wall of the sewage suction pipe 14. Through the above method, the inner wall of the sewage suction pipe 14 can be soaked and cleaned. Continuously cycle the above process until the soaking and cleaning process of the sewage suction pipe 14 is completed.

[0062] As can be seen from the above, compared with Embodiment ① in which the power of the sewage suction motor is maintained at a fixed preset value, in Embodiment ② in which the power of the sewage suction motor varies within a first preset range, since the operating power of the sewage suction motor 13 is variable, multiple spiral liquid flows will be formed at the beginning of the sewage suction motor 13. Coupled with the diversification of the collision methods, more spiral liquid flows will be formed in the sewage suction pipe 14 after the collision. Therefore, in Embodiment ②, the number of spiral liquid flows in the sewage suction pipe 14 is increased, and the soaking effect on the sewage suction pipe 14 is improved. At the same time, in Embodiment ②, since the operating power of the sewage suction motor 13 varies within a certain range, the height of each liquid flow rising along the sewage suction pipe 14, the flowing speed, and the position of each impact of the liquid flow are all different. The spiral liquid flow soaking the sewage suction pipe 14 and the liquid flow impacting and cleaning the sewage suction pipe 14 in different directions exist simultaneously for at least a period of time within a cycle of the duty ratio change of the sewage suction motor to soak and clean the sewage suction pipe 14; or, the spiral liquid flow soaking the sewage suction pipe 14 and the liquid flow impacting and cleaning the sewage suction pipe 14 in the same direction exist simultaneously to soak and clean the sewage suction pipe 14. This enables the entire sewage suction pipe 14 to have the opportunity to be soaked and flushed by the cleaning liquid, fully realizing the comprehensive soaking and cleaning of the entire sewage suction pipe 14 and improving the cleaning effect on the sewage suction pipe 14.

[0063] In one embodiment, the body 1 of the surface cleaning device 100 and the floor brush 2 are pivotally connected, and the threaded pipe with a threaded inner wall in the sewage suction pipe 14 is a bent section. The pitch on the inner wall of the threaded pipe changes due to the bending, and when the liquid flow passes through the bent section, at least part of the liquid flow collides with the bent threaded pipe and then turns, so that the bending direction of the bent section with a threaded inner wall in the sewage suction pipe 14 determines the spiral direction of the spiral liquid flow in the sewage suction pipe 14. As an implementation manner of this embodiment, the bent section of the sewage suction pipe 14 is arranged at the pivot connection of the body 1 and the floor brush 2 and is communicated with the sewage suction port. The bent section is a bendable threaded hose, and the pitch on the inner wall of the bent threaded hose changes due to the bending. Under the action of the sewage suction motor 13, the cleaning liquid enters the sewage suction pipe 14. When flowing through the bent threaded hose, under the influence of the threads arranged irregularly on the inner wall of the threaded hose, at least part of the liquid flow collides with the inner wall of the bent sewage suction pipe 14 and then turns, so that a liquid flow forms multiple liquid flows and continues to climb upward along the sewage suction pipe 14 in the form of a spiral liquid flow. Moreover, since the positions and times of the collisions of the liquid flow in the bent section are different, the degrees and positions of the turning of the liquid flow after colliding with the bent section are also different. Therefore, while the liquid flow collides with the bent section, it strongly cleans the collision area, and at the same time, the multiple spiral liquid flows generated in the sewage suction pipe 14 are multiple spiral liquid flows with different climbing positions and different climbing speeds, realizing the comprehensive cleaning of the sewage suction pipe 14. Specifically, a bent section formed by a threaded hose is arranged at the pivot connection of the body 1 and the floor brush 2. Exemplarily, when the bent section bends from the body 1 towards the floor brush 2, that is, the threaded hose bends forward, if the spiral direction of the threaded inner wall in the bent section is left-handed, when the liquid flow enters the sewage suction pipe 14 from the sewage suction port 15, it first passes through the bent section. During the flowing process, it collides with the inner wall of the threaded hose on the side of the bent section close to the body 1. After the liquid flow collides, it cleans the collided area and at the same time turns, forming a right-handed liquid flow in the sewage suction pipe 14. As another implementation manner in this embodiment, when the bending direction of the bent section from the body 1 towards the floor brush 2 is backward bending, if the spiral direction of the threaded inner wall in the bent section is left-handed, when the liquid flow enters the sewage suction pipe 14 from the sewage suction port 15, it first passes through the bent section. During the flowing process, it collides with the inner wall of the threaded hose on the side of the bent section close to the floor brush 2. After the liquid flow collides, it cleans the collided area and at the same time turns, forming a left-handed liquid flow in the sewage suction pipe 14.

[0064] Compared with the vertically upward climbing liquid flow, the spiral liquid flow climbing spirally in the sewage suction pipe 14 has a longer traveling distance of the cleaning liquid in the sewage suction pipe 14, increasing the soaking time and the contact rate between the cleaning liquid and the sewage suction pipe 14. Moreover, the bent section is a section of the sewage suction pipe 14 rather than a point. Therefore, the positions and times of the impact of the liquid flow in the bent section are different, resulting in different rotation directions and positions of the liquid flow after turning, thus forming multiple spiral liquid flows in the sewage suction pipe 14. At the same time, multiple spiral liquid flows soak and clean different positions of the sewage suction pipe 14. The same position on the inner wall of the sewage suction pipe 14 may be cleaned by multiple liquid flows many times, making the cleaning of the sewage suction pipe 14 more comprehensive and thorough.

[0065] Further, during the soaking and cleaning stage, since the cleaning liquid entering the sewage suction pipe 14 reciprocates in the sewage suction pipe, the liquid supply assembly for supplying liquid to the surface cleaning device adopts an intermittent liquid supply form. Specifically, during the soaking and cleaning stage, if the liquid supply volume is too large, the power of the sewage suction motor 13 is not sufficient to suck all the cleaning liquid, resulting in waste of the cleaning liquid. Moreover, if the sewage suction motor 13 sucks too much cleaning liquid into the sewage suction pipe at one time, the contact rate between the liquid flow and the sewage suction pipe 14 will be reduced, making the liquid flow unable to fully contact the sewage suction pipe 14. And the excessive cleaning liquid cannot form a spiral liquid flow that slowly climbs along the inner wall of the sewage suction pipe 14, reducing the soaking effect of the sewage suction pipe 14. Therefore, compared with the existing sewage suction pipe cleaning method, the soaking and cleaning scheme for cleaning the sewage suction pipe 14 reduces the usage amount of the cleaning liquid. Only by intermittently supplying liquid to supplement the cleaning liquid in the sewage suction pipe 14, the cleaning effect of spiral soaking and impact cleaning of the sewage suction pipe 14 can be achieved in the sewage suction pipe 14 with less cleaning liquid. At the same time, under the action of the sewage suction motor 13, the cleaning liquid slowly climbs in the sewage suction pipe to fully soak the inner wall of the sewage suction pipe 14 and reciprocates to fully contact the inner wall of the sewage suction pipe 14, saving the usage amount of the cleaning liquid and improving the utilization rate of the cleaning liquid.

[0066] In one embodiment, a rotating blade is provided in the sewage suction motor 13. The rotation of the rotating blade forms a spiral air flow in the sewage holding bucket 12. The spiral air flow flows from the sewage holding bucket 12 towards the rotating blade of the sewage suction motor 13 to form a suction air flow in the sewage suction pipe 14 connected to the sewage holding bucket 12, guiding the cleaning liquid to flow along the sewage suction pipe 14. Exemplarily, when looking down at the rotating direction of the rotating blade from above the surface cleaning device 100, it is clockwise. The cleaning liquid in the sewage suction pipe 14 spirally climbs along the inner wall of the sewage suction pipe 14 under the action of the suction air flow.

[0067] In one embodiment, the pipeline cleaning method of the surface cleaning device 100 in the present application further includes a flushing stage S220. Specifically: Flushing stage S220: Control the sewage suction motor 13 to operate at a second power, so that the cleaning liquid reciprocates along the sewage suction pipeline 14 under the suction action of the sewage suction motor 13 to scour the sewage suction pipeline 14. Wherein, the second power varies within a second preset range, or the second power remains at a second preset value.

[0068] In this stage, the sewage suction motor 13 controls the cleaning liquid flow to flow at a faster speed, reciprocally scouring the sewage suction pipeline 14, and then cleaning the sewage suction pipeline 14 with a stronger force.

[0069] Wherein, to ensure that the cleaning liquid flow can reciprocate in the sewage suction pipeline 14, the second power should be less than the operating power of the sewage suction pipeline 14 in all cleaning modes. In one embodiment, the power variation range of the sewage suction motor 13 corresponding to the first preset range is less than the power variation range of the sewage suction motor 13 corresponding to the second preset range, and the second power is greater than the first power. Specifically, at this time, the first preset range can be 0.3P to 0.4P, and the second preset range can be 0.3P to 0.8P, where P is the rated power of the sewage suction motor 13. The power variation range of the sewage suction motor 13 corresponding to the first preset range refers to the difference between the maximum value and the minimum value in the first preset range; the power variation range of the sewage suction motor 13 corresponding to the second preset range refers to the difference between the maximum value and the minimum value in the second preset range. When the power variation range of the sewage suction motor 13 corresponding to the first preset range is less than the power variation range of the sewage suction motor 13 corresponding to the second preset range, the power fluctuation of the sewage suction motor 13 is smaller. It can be clearly defined from the above limitations that the fluctuation range of the operating power of the sewage suction motor 13 in the soaking cleaning stage S210 is less than the fluctuation range of the sewage suction motor 13 in the flushing stage S220, and the operating power of the sewage suction motor 13 in the soaking cleaning stage S210 is less than the operating power of the sewage suction motor 13 in the flushing stage S220. The above setting method improves the flow rate of the cleaning liquid in the sewage suction pipeline 14 in the flushing stage S220, so that the liquid flow in the flushing stage S220 can clean the sewage suction pipeline 14 with a stronger force. At the same time, the above setting method enables the liquid flow to climb more slowly along the inner wall of the sewage suction pipeline 14 in the soaking cleaning stage S210, fully ensuring the soaking effect of the cleaning liquid on the sewage suction pipeline 14.

[0070] For easy understanding, the working method of the flushing stage S220 is illustrated by the following example:

[0071] When the sewage suction motor 13 operates at the second power and the second power remains at the second preset value, the cleaning liquid flows upward along the sewage suction pipeline 14; after climbing a certain distance, the liquid flow flows downward under the action of gravity. At this time, due to the continuous suction force generated by the sewage suction motor 13, the downward flowing liquid flow collides with the upward flowing liquid flow to form a turbulent flow, which scours the inner wall of the sewage suction pipeline 14. Under the action of the sewage suction motor 13, the liquid flow reciprocally scours the inner wall of the sewage suction pipeline 14 in the sewage suction pipeline 14 at a liquid flow velocity greater than that in the immersion cleaning stage S210. Similarly, when the sewage suction motor 13 operates at a second power that varies within the second preset range, the liquid flow also forms a turbulent reciprocating motion in the sewage suction pipeline 14 to scour the inner wall of the sewage suction pipeline 14. The difference is that due to the change in the power of the sewage suction motor 13, the liquid flow velocity and the impact position change to a certain extent. It should be noted that in the flushing stage S220, due to the stronger operating power of the sewage suction motor 13, in this case, the liquid flow in the sewage suction pipeline 14 will no longer show the form of spirally climbing along the inner wall of the sewage suction pipeline 14, but will present a turbulent water column state of reciprocally flowing in the sewage suction pipeline.

[0072] In practical applications, relatively firm dirt may adhere to the inner wall of the sewage suction pipeline 14, and it may be difficult to remove all the dirt only by soaking. Therefore, in this application, to ensure the cleaning effect, a pipeline cleaning method that combines the immersion cleaning stage S210 and the flushing stage S220 is often used. The inner wall of the sewage suction pipeline 14 is soaked and scoured to avoid dirt residue.

[0073] Specifically, in an optional implementation manner of this application, when the surface cleaning device 100 cleans the sewage suction pipeline 14, it can first execute the immersion cleaning stage S210, and then execute the flushing stage S220.

[0074] After the control component executes the immersion cleaning stage S210, the inner wall of the sewage suction pipeline 14 is fully soaked by the cleaning liquid, reducing the adhesion force of the dirt to the inner wall of the sewage suction pipeline 14 and removing most of the dirt attached to the inner wall of the sewage suction pipeline 14. After the sewage suction pipeline 14 is fully soaked, the flushing stage S220 will be executed after the immersion cleaning stage S210. By executing the flushing stage S220, the liquid flow surges back and forth along the sewage suction pipeline 14, reciprocally scouring the sewage suction pipeline 14 to remove the remaining dirt attached to the inner wall of the sewage suction pipeline 14.

[0075] In an embodiment, when the surface cleaning device 100 cleans the sewage suction pipeline 14, it can first execute the flushing stage S220, and then execute the immersion cleaning stage S210 after the flushing stage S220 is completed.

[0076] In this embodiment, first, the flushing stage S220 is executed to remove the dirt slightly attached to the inner wall of the sewage suction pipe 14 with a relatively strong cleaning force. Since the flow rate of the cleaning liquid in the flushing stage S220 is relatively fast and the cleaning force is stronger, most of the dirt attached to the inner wall of the sewage suction pipe 14 can be removed in a relatively short time in this stage. After the flushing stage S220 ends, the soaking and cleaning stage S210 is executed to soak the small amount of remaining stubborn dirt attached to the inner wall of the sewage suction pipe 14, so that the dirt falls off from the inner wall of the sewage suction pipe 14 through soaking. Since only a small amount of dirt remains on the inner wall of the sewage suction pipe 14 after the flushing stage S220 is executed, the dirt remaining on the inner wall of the sewage suction pipe 14 can be removed in a relatively short time in the soaking and cleaning stage S210 at this time. Therefore, in summary, it can be seen that in this embodiment, while ensuring the cleaning effect on the sewage suction pipe 14, the sewage suction pipe 14 can be cleaned in a relatively short time, improving the cleaning efficiency of the sewage suction pipe 14.

[0077] In one embodiment, when the surface cleaning device 100 cleans the sewage suction pipe 14, the soaking and cleaning stage S210 and the flushing stage S220 can be alternately executed.

[0078] By the above measures, the soaking and cleaning stage S210 and the flushing stage S220 are alternately executed, so as to ensure the cleaning effect and avoid dirt residue on the inner wall of the sewage suction pipe 14. At the same time, it is also possible to complete the cleaning of the sewage suction pipe 14 with less cleaning time, ensuring both the cleaning efficiency and the cleaning effect.

[0079] Furthermore, when using the soaking and cleaning stage S210 and the flushing stage S220 to clean the sewage suction pipe 14, the liquid can be continuously supplied or intermittently supplied only in the soaking and cleaning stage, and the cleaning liquid in the soaking and cleaning stage can be reused in the flushing stage to realize the reuse of the cleaning liquid and save the usage amount of the cleaning liquid. Or, the liquid can be continuously supplied or intermittently supplied only in the flushing stage, and the cleaning liquid in the flushing stage can be reused in the soaking and cleaning stage to save the usage of the cleaning liquid.

[0080] In one embodiment, when the control component executes the above soaking and cleaning stage S210 and flushing stage S220, a sewage suction step is also executed. Specifically, the sewage suction step is: controlling the sewage suction motor 13 to operate at a third power so that the cleaning liquid in the sewage suction pipe 14 is sucked into the sewage storage bucket 12; wherein, the third power is greater than the first power and the third power is greater than the second power. Specifically, the third power can be equal to the operating power of the sewage suction motor 13 when the surface cleaning device 100 executes the cleaning task.

[0081] In this embodiment, when the control component cleans the sewage suction pipe 14 during the above-mentioned soaking and cleaning stage S210 and rinsing stage S220, the cleaning liquid in the sewage suction pipe 14 will become more and more turbid. Therefore, at this time, to ensure the cleaning effect of the sewage suction pipe 14, after the cleaning liquid flows in the sewage suction pipe 14 for a period of time, the sewage suction step is performed to suck the cleaning liquid in the sewage suction pipe 14 into the sewage storage bucket 12. Specifically, on the one hand, the suction method can be that at the end of the soaking and cleaning stage S210 and / or at the end of the rinsing stage S220, the sewage suction motor 13 operates at the third power to suck the cleaning liquid in the sewage suction pipe 14 into the sewage storage bucket 12. On the other hand, the suction method can be that during the soaking and cleaning stage S210, when the control component monitors that the sewage suction motor 13 operates at the first power for the first preset duration, the operating power of the sewage suction motor 13 is increased, so that the sewage suction motor 13 operates at the third power for a fixed duration. In this way, the cleaning liquid in the sewage suction pipe 14 is intermittently sucked into the sewage storage bucket 12 during the soaking and cleaning stage S210. On the third hand, the suction method can be that during the rinsing stage S220, when the control component monitors that the sewage suction motor 13 operates at the second power for the second preset duration, the operating power of the sewage suction motor 13 is increased, so that the sewage suction motor 13 operates at the third power for a fixed duration. In this way, the cleaning liquid in the sewage suction pipe 14 is intermittently sucked into the sewage storage bucket 12 during the rinsing stage S220. Exemplarily, the first preset duration and the second preset duration can be 5-10 s, and the fixed duration can be 2-3 s.

[0082] In one embodiment, the surface cleaning device 100 in the present application further includes a dirt detection device for detecting the dirt degree in the sewage suction pipe 14. In another embodiment, when the dirt detection device is installed on the surface cleaning device 100, the cleaning liquid in the sewage suction pipe 14 can also be absorbed into the sewage storage bucket 12 through the following suction method: during the soaking and cleaning stage S210 and the rinsing stage S220, the control component continuously receives the dirt detection data detected by the dirt detection device, and then judges the turbidity degree of the cleaning liquid in the sewage suction pipe 14 according to the above-mentioned dirt detection data, and further determines whether to perform the above-mentioned sewage suction step according to the above-mentioned judgment result. Specifically, the above-mentioned dirt detection data can be the dirt detection value detected by the dirt detection device, or can be the dirt change rate fitted from the dirt detection value. When the above-mentioned dirt detection value or dirt change rate reaches the third preset value, it means that the turbidity degree of the cleaning liquid in the sewage suction pipe 14 is relatively high at this time. At this time, the control component can increase the operating power of the sewage suction motor 13, so that the sewage suction motor 13 operates at the third power for a fixed duration, and then a stronger suction force is generated in this way to suck the cleaning liquid in the sewage suction pipe 14 into the sewage storage bucket 12.

[0083] In the above manner, the cleaning liquid in the sewage suction pipe 14 is regularly sucked into the sewage bucket 12, improving the cleaning effect on the sewage suction pipe 14.

[0084] In one embodiment, when performing the above-mentioned soaking and cleaning stage S210, the control component can determine whether to end the soaking and cleaning stage S210 according to the dirt detection data detected by the dirt detection device. Also, when performing the flushing stage S220, it determines whether to end the flushing stage S220 according to the above-mentioned dirt detection data. And, it switches the cleaning stage according to the dirt detection data.

[0085] In one embodiment, when performing the soaking and cleaning stage S210 and / or the flushing stage S220, the control component can control the cleaning component 21 to stop rotating, thereby avoiding the cleaning component 21 from bringing dirt into the sewage suction pipe 14 during the cleaning of the sewage suction pipe 14 and affecting the cleaning effect on the sewage suction pipe 14.

[0086] Through the above measures, when performing the soaking and cleaning stage S210 and / or the flushing stage S220, the control component controls the cleaning component 21 to stop rotating, avoiding the cleaning component 21 from bringing dirt into the sewage suction pipe 14 and fully ensuring the cleaning effect on the sewage suction pipe 14.

[0087] In one embodiment, as Figure 5 shown, the surface cleaning device 100 in the present application may further include a base 3. The body 1 and the floor brush 2 form the main body part of the surface cleaning device 100, and the above-mentioned main body part can be placed on the base 3 for self-cleaning. Among them, the surface cleaning device 100 mentioned in the present application all refers to the main body part of the surface cleaning device 100. In this case, the pipeline cleaning method of the surface cleaning device 100 introduced in the above-mentioned embodiment can be applied to the process of the main body part performing self-cleaning on the base 3. At this time, when the main body part of the surface cleaning device 100 is placed on the base 3, the control component executes the above-mentioned pipeline cleaning method of the surface cleaning device 100 to clean the sewage suction pipe 14.

[0088] Generally, according to the degree of ground dirt detected by the dirt sensor, the surface cleaning device 100 will automatically adopt different cleaning modes for cleaning. However, as the cleaning process progresses, some stubborn dirt adheres to the inner wall of the sewage suction pipe 14, resulting in the inability to accurately predict the ground dirt situation by detecting the dirt in the sewage suction pipe 14. As a result, when there is less dirt on the ground, the surface cleaning device 100 still always cleans in the heavy dirt cleaning mode, causing serious energy waste. Therefore, to avoid the occurrence of the above problems, the present application will use the above-mentioned pipeline cleaning method to clean the sewage suction pipe 14 during the cleaning work of the surface cleaning device 100, avoiding the situation where stubborn dirt adheres to the wall and causing inaccurate dirt detection.

[0089] The specific cleaning method is that when the surface cleaning device 100 cleans the ground, the pipeline cleaning method of the surface cleaning device 100 mentioned in the above embodiment is executed every preset time period; or, when the dirt detection data reaches the set threshold and lasts for the preset time, the control component executes the pipeline cleaning method of the surface cleaning device 100 mentioned in the above embodiment once. Among them, when the dirt detection data reaches the set threshold, it indicates that the dirt degree of the sewage suction pipeline 14 reaches the cleaning standard.

[0090] Through the above measures, the sewage suction pipeline 14 is cleaned during the cleaning work of the surface cleaning device 100, so as to accurately judge the dirt degree of the ground by detecting the dirt condition in the sewage suction pipeline 14, and then accurately adjust the cleaning mode of the surface cleaning device 100 to save energy.

[0091] It should be noted that as Figure 5 shown, when the above pipeline cleaning method is applied to the process of the body part performing self-cleaning on the base 3, the base 3 can be filled with cleaning liquid in advance, and the cleaning liquid on the base 3 is sucked during the pipeline cleaning process. Or, the control component controls the liquid supply component to supply liquid to the cleaning component 21 or the base 3 for pipeline cleaning. Or, the liquid supply component is communicated with the sewage suction pipeline, and the cleaning liquid is directly provided to the sewage suction pipeline 14 by the liquid supply component. Among them, the liquid supply mode of the liquid supply component during the pipeline cleaning process can be continuous liquid supply or intermittent liquid supply; the way for the control component to control the liquid supply component to discharge the cleaning liquid is to control the cleaning liquid in the water tank 11 to be discharged into the base 3, the cleaning component 21 or the sewage suction pipeline 14.

[0092] When the above pipeline cleaning method is applied to the process of the surface cleaning device 100 performing cleaning work, the control component can control the liquid supply component to discharge the cleaning liquid into the cleaning component 21, the ground or the sewage suction pipeline 14, and the specific discharge method is the same as that in the above embodiment, which will not be elaborated here.

[0093] In several embodiments provided in the present application, the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are only illustrative.

[0094] In addition, in each embodiment of the present application, the various functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

Claims

1. A pipe cleaning method for a surface cleaning device, applied to a surface cleaning device, the surface cleaning device comprising a cleaning component, a sewage suction motor, a sewage storage bucket, a sewage suction port, and a sewage suction pipe connecting the sewage storage bucket and the sewage suction port, characterized in that, The sewage suction pipe is at least partially a threaded pipe with a threaded inner wall. The pipe cleaning method of the surface cleaning device includes: Soaking and cleaning stage: Control the sewage suction motor to operate at a first power, where the first power varies within a first preset range or remains at a first preset value. The first power is less than the operating power of the sewage suction motor when the surface cleaning device performs a cleaning task, so that the liquid flow moving in the sewage suction pipe forms multiple spiral liquid flows after impact to soak and clean the sewage suction pipe. Flushing stage: Control the sewage suction motor to operate at a second power so that the cleaning liquid reciprocates along the sewage suction pipe under the suction of the sewage suction motor to flush the sewage suction pipe. The second power varies within a second preset range or remains at a second preset value. Wherein, the power change range of the sewage suction motor corresponding to the first preset range is less than the power change range of the sewage suction motor corresponding to the second preset range, and the second power is greater than the first power.

2. The pipeline cleaning method of the surface cleaning device according to claim 1, characterized in that, By controlling the duty cycle of the sewage suction motor to adjust the power of the sewage suction motor, control the sewage suction motor to alternate between two constant values within the range of 20%-60% of the duty cycle, so that within at least a period of time in a cycle of the change of the duty cycle of the sewage suction motor, the spiral liquid flow soaking the sewage suction pipe and the liquid flow colliding while moving in different directions exist simultaneously to soak and clean the sewage suction pipe; or, the spiral liquid flow soaking the sewage suction pipe and the liquid flow colliding while moving in the same direction exist simultaneously to soak and clean the sewage suction pipe.

3. The pipeline cleaning method of the surface cleaning device according to claim 1, characterized in that, Control the sewage suction motor to change periodically from large to small within the range of 20%-60% of the duty cycle, so that within at least a period of time in a cycle of the change of the duty cycle of the sewage suction motor, the spiral liquid flow soaking the sewage suction pipe and the liquid flow colliding while moving in different directions exist simultaneously to soak and clean the sewage suction pipe.

4. The pipeline cleaning method of the surface cleaning device according to claim 1, characterized in that, Control the sewage suction motor to change periodically from small to large within the range of 20%-60% of the duty cycle, so that within at least a period of time in a cycle of the change of the duty cycle of the sewage suction motor, the spiral liquid flow soaking the sewage suction pipe and the liquid flow colliding while moving in the same direction exist simultaneously to soak and clean the sewage suction pipe.

5. The pipeline cleaning method of the surface cleaning device according to claim 1, characterized in that, The threaded pipe is a bent section communicating with the sewage suction port, and the pitch on the inner wall of the threaded pipe changes due to the bend. At least part of the liquid flow collides with the bent threaded pipe and turns when flowing through the bent section.

6. The pipeline cleaning method of the surface cleaning device according to any one of claims 1-5, characterized in that, The surface cleaning device further includes a liquid supply assembly. The pipe cleaning method of the surface cleaning device further includes: In the soaking and cleaning stage, control the liquid supply assembly to supply liquid intermittently.

7. The pipeline cleaning method of the surface cleaning device according to claim 1, characterized in that, The pipe cleaning method of the surface cleaning device further includes: alternately performing the soaking and cleaning stage and the flushing stage.

8. The pipeline cleaning method of the surface cleaning device according to claim 1, characterized in that, The pipe cleaning method of the surface cleaning device further includes: Sewage suction step: Control the sewage suction motor to operate at a third power so that the cleaning liquid in the sewage suction pipe is sucked into the sewage storage bucket. The third power is greater than the first power.

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