Liquid return system of cleaning device and cleaning device

Abstract

The utility model relates to cleaning equipment technical field discloses a kind of liquid return system of cleaning equipment and cleaning equipment, comprising: liquid storage tank, switching device and working pipeline connected in turn;Liquid return pipeline, one end is communicated with working pipeline, the other end is connected with switching device, switching device is configured to make liquid storage tank and working pipeline and one of liquid return pipeline selective conduction;Air inlet pipeline is connected with working pipeline and is equipped with check valve;Water pump is connected between air inlet pipeline and working pipeline, it has fluid inlet and fluid outlet.In the conduction of liquid storage tank and liquid return pipeline, external gas flows into water pump under the action of water pump through air inlet pipeline and fluid inlet, and from fluid outlet to working pipeline.When equipment runs high temperature mode, switching to the conduction of liquid storage tank and liquid return pipeline, external gas flows to working pipeline under the action of water pump through air inlet pipeline, to residual liquid in pipeline is returned to liquid storage tank, avoid condensate spatter situation in initial working stage.

Description

Technical Field

[0001] This utility model relates to the field of cleaning equipment technology, specifically to a liquid return system and cleaning equipment. Background Technology

[0002] Traditional cleaning equipment, such as fabric cleaning machines, typically use a brush head to directly spray liquid detergent when dealing with stubborn stains. Their liquid delivery system relies on a built-in long-distance hose for fluid transfer, but due to the technical limitations of insufficient cold water cleaning efficiency, they have consistently struggled to effectively remove grease and deep-seated dirt.

[0003] To address this industry pain point, high-temperature steam technology has been introduced into the fabric cleaning field—through the principle of thermal degradation, high-temperature steam can efficiently break down the molecular structure of dirt. When steam works synergistically with specialized cleaning agents, its penetration and reactivity are significantly enhanced, enabling it to deeply break down stubborn stains such as coffee stains and oil stains.

[0004] However, after the cleaning equipment is shut down, condensation can easily accumulate inside the long hoses. When the equipment operates in high-temperature modes such as steam or hot water, the condensation trapped in the pipes will be discharged first, causing condensation to splash during the initial operation phase, which affects the user experience. Utility Model Content

[0005] This invention provides a liquid return system and cleaning equipment to solve or improve the problem in related technologies where condensate splashes during the initial operation of cleaning equipment in high-temperature mode, resulting in a poor user experience.

[0006] In a first aspect, this utility model provides a liquid return system for a cleaning device, comprising:

[0007] The storage tank, switching device, and working pipeline are connected in sequence;

[0008] The return liquid pipeline has one end connected to the working pipeline and the other end connected to the switching device. The switching device is configured to selectively connect the liquid storage tank to one of the working pipeline and the return liquid pipeline.

[0009] An intake pipe is connected to the working pipe, and a one-way valve is provided on the intake pipe; and,

[0010] A water pump is connected between the air intake line and the working line, the water pump having a fluid inlet connected to the air intake line and a fluid outlet connected to the working line.

[0011] In an alternative embodiment, the fluid inlet of the water pump is also connected to the switching device.

[0012] In one alternative embodiment, the switching device includes a control valve having a first on state and a second on state;

[0013] In the first conductive state, the liquid storage tank is connected to the return liquid pipeline; in the second conductive state, the liquid storage tank is connected to the working pipeline.

[0014] In one optional implementation, the liquid return system further includes:

[0015] The first multi-port connector has a first interface, a second interface, and a third interface. The first interface is connected to the switching device, the second interface is connected to the water pump, and the third interface is connected to the air inlet pipe. The switching device is configured to selectively connect the liquid storage tank to one of the first interface and the return liquid pipe.

[0016] In one optional implementation, the liquid return system further includes:

[0017] A heating component is disposed on the working pipeline and connected to the fluid outlet of the water pump;

[0018] A cleaning component, connected to the fluid output end of the working pipeline and having a fluid channel communicating with the working pipeline; and,

[0019] A switch is provided on the working pipeline or the fluid channel, and the switch is configured to connect or disconnect the working pipeline from the fluid channel.

[0020] One end of the return pipeline is connected between the heating component and the switch, and the other end is connected to the switching device.

[0021] In one optional implementation, the liquid return system further includes:

[0022] The second multi-port connector is disposed on the working pipeline and has a fourth interface, a fifth interface and a sixth interface. The fourth interface is connected to the heating component, the fifth interface is connected to the cleaning component, and the sixth interface is connected to the return liquid pipeline.

[0023] In one alternative implementation, the heating assembly includes:

[0024] A heating element is connected to the fluid outlet of the water pump;

[0025] A filter device is connected between the heating element and the cleaning component; and,

[0026] A pressure relief valve is connected to the heating element.

[0027] In one alternative embodiment, the fluid output end of the air intake pipe is disposed between the switching device and the heating assembly.

[0028] In one optional implementation, the liquid return system further includes:

[0029] A pressure monitoring device is installed between the fluid outlet of the water pump and the heating assembly.

[0030] Secondly, this utility model also provides a cleaning device, including a liquid return system as described in any of the above-mentioned cleaning devices.

[0031] The liquid return system of the cleaning equipment provided by this utility model can selectively connect the liquid storage tank and the working pipeline or the liquid storage tank and the side-by-side liquid return pipeline through a switching device. When the equipment is operating in high-temperature modes such as steam mode or hot water mode, before generating steam or hot water, it can be switched to connect the liquid storage tank and the liquid return pipeline. At this time, the external gas can be pushed open by the water pump to open the valve disc of the one-way valve and flow into the water pump through the air inlet pipeline, and then flow out from the water pump to the working pipeline. Thus, under the action of the external gas, the residual liquid in the working pipeline is discharged back into the liquid storage tank, avoiding the condensate splashing that occurs in the initial working stage in high-temperature mode, and improving the user experience. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is one of the structural schematic diagrams of the liquid return system of the cleaning equipment according to an embodiment of this utility model;

[0034] Figure 2 This is a second schematic diagram of the liquid return system of the cleaning equipment according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the cleaning equipment according to an embodiment of the present invention when the return liquid system is switched to the liquid storage tank and the working pipeline is connected.

[0036] Figure 4 This is a schematic diagram of the structure of the cleaning equipment according to an embodiment of the present invention when the return liquid system is switched to the liquid storage tank and the return liquid pipeline is connected.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Liquid storage tank; 2. Switching device; 3. Air inlet pipe; 4. Check valve; 5. First multi-port connector; 501. First interface; 502. Second interface; 503. Third interface; 6. Water pump; 601. Fluid inlet; 602. Fluid outlet; 7. Pressure monitoring device; 8. Heating element; 9. Filter device; 10. Pressure relief valve; 11. Second multi-port connector; 1101. Fourth interface; 1102. Fifth interface; 1103. Sixth interface; 12. Return pipe; 13. Cleaning component; 14. Switch; 15. Working pipe; 16. Heating assembly. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0043] The following is combined Figures 1 to 4 This invention describes the liquid return system and cleaning equipment of the cleaning equipment according to embodiments of the present invention.

[0044] According to embodiments of this utility model, in one aspect, a liquid return system for cleaning equipment is provided, suitable for fabric cleaning machines, floor scrubbers, carpet cleaners, or other cleaning equipment with relatively long water pipes. Specifically, such as... Figure 1 As shown, the liquid return system of this cleaning equipment includes a liquid storage tank 1, a switching device 2, an air inlet pipe 3, a water pump 6, a liquid return pipe 12, and a working pipe 15. Specifically, the liquid storage tank 1, the switching device 2, and the working pipe 15 are connected sequentially via pipes. One end of the liquid return pipe 12 is connected to the working pipe 15, and the other end is connected to the switching device 2. The switching device 2 is configured to selectively connect the liquid storage tank 1 to either the working pipe 15 or the liquid return pipe 12. The air inlet pipe 3 is connected to the working pipe 15, and a one-way valve 4 is provided on the air inlet pipe 3. The water pump 6 is connected between the air inlet pipe 3 and the working pipe 15. The water pump 6 has a fluid inlet 601 connected to the air inlet pipe 3 and a fluid outlet 602 connected to the working pipe 15. With the storage tank 1 connected to the return pipeline 12, external gas flows into the water pump 6 through the air inlet pipeline 3 and the fluid inlet 601 under the action of the water pump 6, and flows out from the fluid outlet 602 to the working pipeline 15. Optionally, the storage tank 1 can be used to store at least one of clean water and cleaning fluid.

[0045] Specifically, in practical applications, the cleaning equipment defaults to the normal water spray mode, which sprays water as usual. The cleaning equipment also has a high-temperature mode, which includes a steam mode and / or a hot water mode. For example, in steam mode, it can spray steam, and in hot water mode, it can spray hot water. Figure 4As shown, taking the preparation of the cleaning equipment into steam mode as an example, firstly, the switching device 2 switches to connect the liquid storage tank 1 and the return liquid pipeline 12. The operation of the water pump 6 allows external gas to flow into the working pipeline 15 through the air inlet pipeline 3, thereby draining the residual liquid in the working pipeline 15 back into the liquid storage tank 1 under the action of the external gas. After the residual water is recovered, the steam mode can be started normally, and steam will be emitted. It should be noted that by switching between different working states, two fluid paths are formed, which can meet the needs of conventional water spraying and steam / hot water spraying scenarios, and can also recover residual water as needed when switching between different modes of the cleaning equipment, avoiding water waste.

[0046] As can be understood, unidirectional flow refers to the characteristic of allowing fluid to flow freely in one direction, while being hindered or completely blocked in the reverse direction. Specifically, the one-way valve 4 is a common pressure differential-driven unidirectional flow device in related technologies. The one-way valve 4 typically consists of a valve body, a moving valve disc, a sealing surface, and a spring. The valve body has a fluid passage with an inlet and an outlet. The valve disc is the core moving component, used to block or open the passage. The sealing surface is a fixed surface that mates with the valve disc, ensuring a tight seal in the reverse direction. The spring provides auxiliary closing force to ensure a reverse seal. The one-way valve 4 operates in two phases: "forward flow" and "reverse blocking." Forward flow occurs when fluid flows from the inlet to the outlet (forward direction). The inlet pressure is greater than the outlet pressure and the valve disc resistance. The pressure difference forces the valve disc to overcome the resistance and move away from the sealing surface, opening the fluid passage and allowing fluid to flow from the inlet to the outlet. Reverse blocking occurs when fluid attempts to flow from the outlet to the inlet (reverse direction). The outlet pressure is greater than the inlet pressure, and the pressure difference presses the valve disc against the sealing surface, using the contact force of the sealing surface to block the fluid passage and achieve reverse sealing. Thus, the one-way valve 4 enables one-way communication between the intake pipe 3 and the outside environment, simplifying the system control logic, reducing reliance on active control components such as solenoid valves, lowering system complexity and failure rate, and improving response speed.

[0047] With this configuration, the switching device 2 can selectively connect the liquid storage tank 1 and the working pipeline 15, or the liquid storage tank 1 and the side-mounted return pipeline 12. When the equipment is operating in high-temperature modes such as steam mode or hot water mode, before generating steam or hot water, the liquid storage tank 1 and the return pipeline 12 can be connected. At this time, under the action of the water pump 6, the external gas can open the valve disc in the one-way valve 4 and flow into the water pump 6 through the air inlet pipeline 3, and then flow out from the water pump 6 to the working pipeline 15. Thus, under the action of the external gas, the residual liquid in the working pipeline 15 is discharged back into the liquid storage tank 1, avoiding the splashing of residual liquid in the pipeline during the initial working stage in high-temperature mode, and improving the user experience.

[0048] Optionally, in some embodiments of this utility model, such as Figure 1As shown, the fluid inlet 601 of the water pump 6 is also connected to the switching device 2. When the storage tank 1 is connected to the working pipeline 15, the liquid in the storage tank 1 flows into the water pump 6 through the switching device 2 and the fluid inlet 601 under the action of the water pump 6, and flows out from the fluid outlet 602 to the working pipeline 15.

[0049] It should be noted that, as Figure 3 As shown, when the switching device 2 switches to the state where the liquid storage tank 1 and the working pipeline 15 are connected, the water pump 6 operates, the one-way valve 4 is in the closed state, and the air inlet pipeline 3 is closed. At this time, the liquid in the liquid storage tank 1 flows into the water pump 6 through the switching device 2 and the fluid inlet 601 under the action of the water pump 6, and flows out from the fluid outlet 602 to the working pipeline 15, thereby fulfilling the normal working requirements of spraying water / steam / hot water. Figure 4 As shown, when the switching device 2 switches to the state where the liquid storage tank 1 and the return liquid pipeline 12 are connected, the liquid storage tank 1 is disconnected from the working pipeline 15. At the same time, the water pump 6 maintains its original operating state. External gas enters the air inlet pipeline 3 under the action of the water pump 6. At this time, the one-way valve 4 is opened under the action of the water pump 6, and the external gas can flow into the water pump 6 through the air inlet pipeline 3 and the fluid inlet 601, and flow out from the fluid outlet 602 to the working pipeline 15, thereby completing the recovery treatment of residual liquid in the pipeline. This setting can utilize the original water pump in the pipeline to intake air, thereby avoiding the need to add additional air intake components (such as air pumps). This reduces costs and minimizes pipeline modifications while meeting the return water requirements under different working modes and ensuring stable system operation.

[0050] In addition, in related technologies, the cleaning equipment recovers residual liquid in the pipeline by controlling the water pump 6 motor to reverse. However, reversing the water pump 6 motor affects its service life and performance. The liquid return system of the cleaning equipment in this embodiment bypasses the return pipeline 12 and switches between different operating states via the switching device 2, forming two fluid paths. This satisfies both conventional water spraying and steam / hot water spraying scenarios, and allows for residual liquid recovery as needed when switching between different cleaning modes. This simplifies the return path structure, and the water pump 6 only needs to operate normally without frequent switching of its rotation direction, effectively ensuring the pump's performance and service life.

[0051] Optionally, in some embodiments of this utility model, the switching device 2 includes a control valve having a first open state and a second open state. In the first open state, the liquid storage tank 1 is connected to the return liquid pipeline 12. In the second open state, the liquid storage tank 1 is connected to the working pipeline 15.

[0052] It should be noted that a control valve refers to a directional valve with multi-position and multi-way functions, which can be a solenoid directional valve, a pneumatic directional valve, etc. For example, if the control valve is a two-position three-way solenoid valve, when the two-position three-way solenoid valve switches to the first conducting state, the working pipeline 15 is connected to the liquid storage tank 1, forming a connection as shown in the diagram. Figure 3 The water path is shown. When the two-position three-way solenoid valve switches to the second conducting state, the return line 12 is connected to the storage tank 1, forming the following... Figure 4 The water return path is shown.

[0053] This setup, through precise control of the liquid flow to different pathways using control valves, enables efficient recovery of residual liquid in the pipeline, saving water resources and significantly improving the user experience.

[0054] Optionally, in some embodiments of this utility model, the return liquid system further includes a first multi-port connector 5, which has a first interface 501, a second interface 502, and a third interface 503. The first interface 501 is connected to the switching device 2, the second interface 502 is connected to the water pump 6, and the third interface 503 is connected to the air inlet pipe 3. The switching device 2 is configured to selectively connect the liquid storage tank 1 to either the first interface 501 or the return liquid pipe 12. In this way, by integrating the connections of the water pump 6, the air inlet pipe 3, and the switching device 2 through a single connector, the use of multiple flanges or quick-connect fittings in traditional pipelines is reduced, the risk of leakage is lowered, and the equipment layout is simpler, reducing the volume occupied.

[0055] Optionally, in some embodiments of this utility model, such as Figure 2 As shown, the return system also includes a heating element 16, a cleaning element 13, and a switch 14. Specifically, the heating element 16 is installed on the working pipeline 15 and connected to the fluid outlet 602 of the water pump 6. By controlling the power and / or water flow rate of the heating element 16, hot water or steam can be generated to meet the usage requirements of steam / hot water mode.

[0056] The cleaning component 13 is connected to the fluid output end of the working pipeline 15, and the cleaning component 13 has a fluid channel communicating with the working pipeline 15. It should be noted that in practical applications, the cleaning equipment defaults to the normal water spray mode, where the cleaning component 13 sprays water normally; in steam mode, the cleaning component 13 sprays steam; and in hot water mode, the cleaning component 13 sprays hot water. Specifically, the cleaning component 13 can be a cleaning brush head, equipped with a nozzle and a steam port. The nozzle is used to spray cold / hot water, and the steam port is used to spray steam. Alternatively, steam can be sprayed using the nozzle without the need for a separate steam port.

[0057] Switch 14 is installed on the working pipeline 15 or the fluid channel. Switch 14 is configured to connect or disconnect the working pipeline 15 from the fluid channel. Specifically, switch 14 can be a mechanical lock. Pressing switch 14 opens the fluid channel of the cleaning component 13, allowing fluid to spray out. Removing external force closes the fluid channel of the cleaning component 13, ensuring the safety of system operation. One end of the return pipeline 12 is connected between the heating assembly 16 and switch 14, and the other end is connected to the switching device 2, thereby ensuring that fluid in the pipeline will not spray out from the cleaning component 13 during residual water recovery.

[0058] It should be noted that, as Figure 3 As shown, when the cleaning equipment is in the normal water spray mode, the switching device 2 switches to connect the liquid storage tank 1 and the working pipeline 15, while the air inlet pipeline 3 is shut off. The water pump 6 is started, and the water in the liquid storage tank 1 is output through the working pipeline 15 under the action of the water pump 6. At this time, the heating component 16 is not working, and the water reaches the cleaning component 13. When in use, the switch 14 is turned on, and water is sprayed out from the cleaning component 13. Since the pipeline between the heating component 16 and the cleaning component 13 is generally long, there is residual water in this long water pipe. If the system is switched directly to steam mode or hot water mode, the residual water in the pipeline will be sprayed out before the steam or hot water is sprayed out, resulting in a poor user experience and potential safety hazards.

[0059] Therefore, as Figure 4 As shown, taking the cleaning equipment in steam mode as an example, firstly, the switching device 2 switches to connect the storage tank 1 and the return pipeline 12, and the water pump 6 is started normally. External gas flows into the water pump through the air inlet pipeline 3 and the fluid inlet 601 under the action of the water pump 6, and flows out from the fluid outlet 602 to the working pipeline 15 to discharge the residual liquid in the working pipeline 15 back into the storage tank 1. After the residual water is recovered, the switching device 2 switches to connect the storage tank 1 and the working pipeline 15, the air inlet pipeline 3 is cut off, and the water pump 6 is started normally. The water in the storage tank 1 is output through the working pipeline 15 under the action of the water pump 6. At this time, the heating element 16 works, and the water is heated by the heating element 16 to form steam, which is then sprayed out from the cleaning element 13. It can be understood that in hot water mode, the working process is the same as in steam mode; hot water can be formed by controlling the power of the heating element 16 and / or the water flow rate.

[0060] Optionally, in some embodiments of this utility model, such as Figure 2As shown, the return system also includes a second multi-way connector 11, which is installed on the working pipeline 15. The second multi-way connector 11 has a fourth interface 1101, a fifth interface 1102, and a sixth interface 1103. The fourth interface 1101 is connected to the heating component 16, the fifth interface 1102 is connected to the cleaning component 13, and the sixth interface 1103 is connected to the return pipeline 12. In this way, a single connector integrates the three connections of the heating component 16, the cleaning component 13, and the return pipeline 12, replacing the traditional combination of multiple flanges or quick-connect fittings in the pipeline. This optimizes the connection points and controls leakage risks, while also improving space utilization and optimizing the system layout.

[0061] Optionally, in some embodiments of this utility model, such as Figure 2 As shown, the heating assembly 16 includes a heating element 8, a filter device 9, and a pressure relief valve 10. Specifically, the heating element 8 is connected to the fluid outlet 602 of the water pump 6. The heating element 8 can be a boiler, a heating box, etc., so as to generate steam or hot water as needed.

[0062] The filter device 9 is connected between the heating element 8 and the cleaning component 13. It should be noted that since the heating element 8 produces scale when it is working, the filter device 9 can remove the scale, prevent the pipe from being blocked, avoid scale accumulation, and improve the service life of the system.

[0063] The pressure relief valve 10 is connected to the heating element 8. Thus, by setting up the pressure relief valve 10, excess pressure can be automatically released in abnormal conditions such as excessive system pressure, preventing safety accidents and improving system safety. It should be noted that the heating element 8, the filter device 9, and the pressure relief valve 10 can be configured independently; alternatively, they can be integrated into one unit, saving costs and reducing space requirements.

[0064] Optionally, in some embodiments of this utility model, such as Figure 2 As shown, the fluid output end of the air intake pipe 3 is located between the switching device 2 and the heating assembly 16. Specifically, the fluid output end of the air intake pipe 3 is located between the switching device 2 and the fluid inlet 601 of the water pump 6. This arrangement, as... Figure 4 As shown, when the return liquid pipeline 12 is connected to the storage tank 1, the liquid in the pipeline will be filtered by the filter device 9 and then flow back to the storage tank 1, which helps to improve the efficiency and service life of the system. Furthermore, the return liquid system of this invention is a one-way return water system, which can prevent scale backflow and blockage of the pipeline.

[0065] Optionally, in some embodiments of this utility model, such as Figure 2As shown, the return system also includes a pressure monitoring device 7, which is located between the fluid outlet 602 of the water pump 6 and the heating element 16. Specifically, the pressure monitoring device 7 is located between the fluid outlet 602 of the water pump 6 and the heating element 8. It should be noted that the pressure monitoring device 7 can be a pressure switch, pressure sensor, etc. In this way, by monitoring the pipeline pressure at the inlet of the heating element 8 through the pressure monitoring device 7, pressure anomalies can be detected immediately, preventing damage to the heating element 8 due to pressure fluctuations. When the pressure monitoring device 7 detects overpressure, it can immediately shut down the heating element 8.

[0066] According to an embodiment of the present invention, another aspect provides a cleaning device, including a liquid return system as described in the various embodiments above. Optionally, the cleaning device is a fabric cleaning machine, a floor scrubber, a carpet cleaner, or other cleaning equipment with a relatively long water pipe. The derivation process of this beneficial effect is roughly similar to the derivation process of the beneficial effect of the liquid return system of the cleaning device described above, and therefore will not be repeated here.

[0067] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A liquid return system for a cleaning device, characterized in that, include: The liquid storage tank (1), the switching device (2), and the working pipeline (15) are connected in sequence; The return line (12) is connected at one end to the working line (15) and at the other end to the switching device (2). The switching device (2) is configured to selectively connect the storage tank (1) to one of the working line (15) and the return line (12). An intake pipe (3) is connected to the working pipe (15), and a one-way valve (4) is provided on the intake pipe (3); and, A water pump (6) is connected between the air intake pipe (3) and the working pipe (15). The water pump (6) has a fluid inlet (601) connected to the air intake pipe (3) and a fluid outlet (602) connected to the working pipe (15).

2. The liquid return system of the cleaning equipment according to claim 1, characterized in that, The fluid inlet (601) of the water pump (6) is also connected to the switching device (2).

3. The liquid return system of the cleaning equipment according to claim 1 or 2, characterized in that, The switching device (2) includes a control valve, which has a first conducting state and a second conducting state; In the first conductive state, the liquid storage tank (1) is connected to the return liquid pipeline (12); in the second conductive state, the liquid storage tank (1) is connected to the working pipeline (15).

4. The liquid return system of the cleaning equipment according to claim 1 or 2, characterized in that, The liquid return system also includes: The first multi-port connector (5) has a first interface (501), a second interface (502) and a third interface (503). The first interface (501) is connected to the switching device (2), the second interface (502) is connected to the water pump (6), and the third interface (503) is connected to the air inlet pipe (3). The switching device (2) is configured to selectively connect the liquid storage tank (1) to one of the first interface (501) and the return liquid pipe (12).

5. The liquid return system of the cleaning equipment according to claim 4, characterized in that, The liquid return system also includes: A heating assembly (16) is disposed on the working pipeline (15) and connected to the fluid outlet (602) of the water pump (6); A cleaning component (13) is connected to the fluid output end of the working pipeline (15) and has a fluid channel communicating with the working pipeline (15); and, A switch (14) is provided on the working pipeline (15) or the fluid channel, the switch (14) being configured to connect or disconnect the working pipeline (15) from the fluid channel; One end of the return pipeline (12) is connected between the heating assembly (16) and the switch (14), and the other end is connected to the switching device (2).

6. The liquid return system of the cleaning equipment according to claim 5, characterized in that, The liquid return system also includes: The second multi-port connector (11) is disposed on the working pipeline (15) and has a fourth interface (1101), a fifth interface (1102) and a sixth interface (1103). The fourth interface (1101) is connected to the heating component (16), the fifth interface (1102) is connected to the cleaning component (13), and the sixth interface (1103) is connected to the return pipeline (12).

7. The liquid return system of the cleaning equipment according to claim 5, characterized in that, The heating assembly (16) includes: A heating element (8) is connected to the fluid outlet (602) of the water pump (6); A filter device (9) is connected between the heating element (8) and the cleaning component (13); and, The pressure relief valve (10) is connected to the heating element (8).

8. The liquid return system of the cleaning equipment according to claim 7, characterized in that, The fluid output end of the air intake pipe (3) is located between the switching device (2) and the heating component (16).

9. The liquid return system of the cleaning equipment according to claim 5, characterized in that, The liquid return system also includes: A pressure monitoring device (7) is installed between the fluid outlet (602) of the water pump (6) and the heating assembly (16).

10. A cleaning device, characterized in that, The liquid return system of the cleaning equipment as described in any one of claims 1 to 9.

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