An intelligent micro-bubble cleaning machine

Abstract

The present invention proposes an intelligent micro-bubble cleaning machine, including a shell with a hollow interior forming a water storage chamber, a water inlet connected to the water storage chamber is provided on the top of the shell, and a water pump, an air pump, a water outlet joint, a water return joint and a filter are provided on the shell; it also includes a three-way joint for connecting the water outlet of the water pump, the air outlet of the air pump and the water outlet joint; the water return joint is connected to the inlet of the filter, and the outlet of the filter is connected to the water storage chamber; it also includes a control module for controlling the operation of the water pump and the air pump. The present invention can be used for cleaning various pipeline systems, such as heating pipelines, refrigeration pipelines, plate heat exchangers, water heaters, wall-mounted boilers, air conditioning pipes, condensers, etc., and has the advantages of fast cleaning speed, high efficiency, greater safety, compact size and portability, and water-saving and environmental protection.

Description

Technical Field

[0001] The invention relates to the field of cleaning machines, and in particular to an intelligent micro-bubble cleaning machine. Background Art

[0002] There are two main ways to clean pipelines:

[0003] 1. Pulse cleaning machine, using air compressor + pulse valve, usually needs to set the pressure of the air compressor to more than 8bar during use, and then use the principle of pulse to alternately pump out air and water to form a water hammer effect, and use the resonance force to make the dirt on the pipe wall fall off. The defect of this technology is that the water hammer effect can usually reach more than 10 times the set pressure (8bar) (the pressure is uncontrollable), which can easily cause the pipeline to fall off and the system components to be damaged. At the same time, it is easy to leave air in the pipeline system, forming air blockage, and it is easy to cause the pipeline and connectors to fall off, especially some pipelines that are already corroded, which can easily cause pipeline damage and leakage;

[0004] 2. Water circulation cleaning machine uses a water pump to inject pre-mixed chemicals into the pipe system, so that the chemicals react with the dirt on the pipe wall to achieve the cleaning purpose. The disadvantage of this technology is that it requires a long time of soaking to achieve the effect, so it takes a lot of time, the cleaning efficiency is low, time-consuming and labor-intensive, and there is also the possibility of corrosion of the pipe. Summary of the invention

[0005] Based on the above problems, the purpose of the present invention is to provide an intelligent micro-bubble cleaning machine that can be used for cleaning various piping systems, such as heating pipes, refrigeration pipes, plate heat exchangers, water heaters, wall-mounted boilers, air-conditioning pipes, condensers, etc., and has a fast cleaning speed, high efficiency, greater safety, small and portable size, and is water-saving and environmentally friendly.

[0006] In view of the above problems, the following technical solutions are provided: an intelligent micro-bubble cleaning machine, comprising an outer shell with a hollow interior forming a water storage chamber, a water inlet connected to the water storage chamber being provided at the top of the outer shell, a water pump, an air pump, a water outlet joint, a return water joint and a filter being provided on the outer shell; further comprising a three-way joint for connecting the water outlet of the water pump, the air outlet of the air pump and the water outlet joint; the return water joint is connected to the inlet of the filter, and the outlet of the filter is connected to the water storage chamber; further comprising a control module for controlling the operation of the water pump and the air pump.

[0007] In the above structure, water is injected into the water storage chamber of the outer shell, and water and air are respectively injected into the three-way joint by the water pump and the air pump to mix and then output from the water outlet joint. The water outlet joint and the water return joint can be quick-release joints, which are respectively connected to the head and tail of the pipeline to be cleaned. When water mixed with air enters the pipeline to be cleaned, the water containing a large number of bubbles can achieve frequent blasting force in the pipeline, and at the same time can generate vortex force and increase the friction force of the pipe wall in a large range. Under the joint action of the above three forces, the dirt in the pipeline to be cleaned can be quickly peeled off, making the pipeline Road cleaning is faster, more thorough and safer. The control module is used to control the start and stop and adjustment of the water pump and the air pump, so as to achieve the purpose of adjusting the water pressure and water flow of the water pump, the air pressure and air flow of the air pump. At the same time, the water flow and water pressure of the water pump, the air pressure of the air pump and the fixed ratio of the air flow are intelligently adjusted. The sewage generated after the water at the outlet joint passes through the pipeline to be cleaned flows to the return joint, enters the filter for filtration, and then is discharged back to the water storage chamber for recycling, which effectively reduces the waste of water resources and avoids the problems of large water reserve and inconvenient movement of the cleaning machine.

[0008] The present invention is further configured such that the ratio of the water pressure pumped by the water pump to the three-way joint to the air pressure pumped by the air pump to the three-way joint is between 10:9 and 10:6; at the same time, the ratio of the volume of water pumped by the water pump to the three-way joint to the volume of air pumped by the air pump to the three-way joint is between 10:8 and 10:5.

[0009] In the above structure, the ratio of water pressure to air pressure is preferably 10:7.5; the ratio of water volume to air volume is preferably 10:6.5. The actual ratio and pressure can be adjusted according to the length of the pipeline to be cleaned, the amount of internal dirt, and the diameter of the pipeline.

[0010] The present invention is further configured such that a one-way valve is provided between the air pump and the three-way joint, which opens when air is supplied toward the three-way joint.

[0011] In the above structure, since the water pressure of the water pump is higher than that of the air pump, a one-way valve is provided to protect the air pump to prevent the water from flowing back to the air pump and damaging the air pump due to blockage caused by dirt downstream of the water outlet joint.

[0012] The present invention is further configured such that an exhaust valve is provided at the water outlet of the water pump.

[0013] In the above structure, the exhaust valve can be used to expel air from the water pump. If the exhaust valve is cancelled, there will be air in the water pump impeller, which may cause it to run idle, resulting in the water pump not discharging water. At the same time, the control module controls the air pump to start 5 seconds later than the water pump to ensure that the water pump can supply water normally before mixing in air, which also effectively prevents the water pump from running idle.

[0014] The present invention is further configured such that a telescopic pull rod is provided at the rear side of the shell, a roller is provided at the bottom of the rear side of the shell, and an anti-slip support leg is provided at the front side of the shell.

[0015] In the above structure, the telescopic pull rod cooperates with the rollers, so that the cleaning machine can be moved as easily as a suitcase with a trolley; at the same time, concave lifting handles are provided on both sides of the shell to facilitate carrying and moving.

[0016] The present invention is further configured such that a concave water collecting trough is provided at the bottom of the water storage chamber, and the suction port of the water pump is located in the water collecting trough.

[0017] In the above structure, since the liquid level near the suction port will be lower than the liquid level away from the suction port when the water pump is pumping, the horizontal height of the water collection tank is lower than the bottom of the water storage chamber, which can effectively collect the water in the water storage chamber for the water pump to pump, avoiding the situation where the water level changes due to the lowering of the water level or the vibration of the outer shell, causing the air to be sucked in and affecting the water-gas mixing ratio.

[0018] The present invention is further configured such that the housing is also provided with a sewage outlet connected to the water collecting tank.

[0019] In the above structure, the sewage outlet is used to empty the water storage chamber, and a sewage valve or a sewage plug can be provided on the sewage outlet for sealing.

[0020] The present invention is further configured such that the control module includes an integrated circuit board and a control panel, and the housing is provided with an integrated circuit board mounting position and a control panel mounting position.

[0021] In the above structure, the control panel is used to control the integrated circuit board to start and stop the water pump and the air pump and to adjust the flow and pressure of the two.

[0022] The present invention is further configured such that the control panel installation position is located at the top of the housing.

[0023] In the above structure, the control panel is installed at the top of the housing. After the control panel is installed, the risk of water splashing can be reduced as much as possible, and it is also easy to operate.

[0024] The present invention is further configured such that the three-way joint includes an air inlet end connected to the air pump, a water inlet end connected to the water pump, and a mixing end connected to the water outlet joint; the air inlet end and the mixing end are coaxially arranged, the inner wall of the mixing end is provided with a negative pressure port, the air inlet end is provided with a bubbler tube, and the bubbler tube extends toward the mixing end and crosses the negative pressure port.

[0025] In the above structure, the cross-sectional flow rate of the inner wall of the mixing end is reduced by setting a negative pressure port to increase the flow rate, so that the air entering the bubble tube can be mixed more evenly, thereby improving the water-gas mixing effect.

[0026] The present invention is further configured as follows: the filter includes a filter element and a lower shell located in the outer shell and exposed to an upper shell of the outer shell, the upper shell is transparent, the filter element is installed in the lower shell and the upper shell, and a detachable bottle cap is provided on the top of the upper shell; the side wall of the filter is connected to the return water joint, so that sewage enters between the lower shell, the inner wall of the upper shell and the outer wall of the filter element for filtration, and a return water pipe connecting the water storage chamber and the inner cavity of the filter element is provided at the bottom of the lower shell, so that clean water filtered by the filter element enters the water storage chamber for reuse.

[0027] In the above structure, the transparent upper shell is convenient for observing the filtering condition and blockage condition of the filter element, and the detachable bottle cap is convenient for replacing or cleaning the filter element. The upper shell is preferably made of transparent polycarbonate material. The filter element can filter out impurities with a diameter greater than 1 micron contained in the sewage, thereby ensuring the cleanliness of the water circulation and avoiding secondary damage to the pipeline and water pump to be cleaned by impurities falling off during cleaning.

[0028] The beneficial effects of the present invention are as follows: water is injected into the water storage cavity of the outer shell, and water and air are respectively injected into the three-way joint through the water pump and the air pump for mixing and then output from the water outlet joint. The water outlet joint and the return water joint can be quick-release joints, and the two are respectively connected to the head and tail of the pipeline to be cleaned. When water mixed with air enters the pipeline to be cleaned, the water containing a large number of bubbles can realize frequent blasting force in the pipeline, and can also generate vortex force and increase the friction force of the pipe wall on a large scale. Under the joint action of the above three forces, the dirt in the pipeline to be cleaned can be quickly peeled off, making the pipeline cleaning faster, more thorough and safer. The control module is used to control the start, stop and adjustment of the water pump and the air pump, so as to achieve the purpose of adjusting the water pressure and water flow rate of the water pump, the air pressure and air flow rate of the air pump, and at the same time intelligently It can adjust and control the water flow and water pressure of the water pump, and the fixed ratio of the air pressure and air flow of the air pump. The sewage generated after the water from the outlet joint passes through the pipeline to be cleaned flows to the return joint, enters the filter and is then discharged back to the water storage chamber for recycling, effectively reducing the waste of water resources. At the same time, it also avoids the problems of large water reserve and inconvenient movement of the cleaning machine. Its working pressure is generally limited to 4 bar (it can be increased or decreased according to the actual state of the pipeline). Since the air is mixed with water and flows in the pipeline to be cleaned, there is no water hammer effect of the pulse cleaning machine. Compared with the working pressure of more than 8 bar of the pulse cleaning machine, combined with the water hammer effect and the resonance principle, the actual pressure in the pipeline to be cleaned may be more than ten times of 8 bar, so the safety of the pipeline can be effectively protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0030] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the shell of the present invention.

[0031] Figure 3It is a schematic diagram of the water and gas paths of the present invention.

[0032] Figure 4 It is a schematic diagram of the filter structure of the present invention.

[0033] Figure 5 It is a schematic diagram of the structure of a three-way connector of the present invention.

[0034] Meaning of the numbers in the figure: 10-housing; 101-drain outlet; 102-ICB installation position; 103-control panel installation position; 11-water storage chamber; 111-water collecting tank; 12-water filling port; 13-water pump; 131-exhaust valve; 14-air pump; 141-check valve; 15-water outlet joint; 16-water return joint; 17-filter; 171-filter element; 172-lower shell; 1721-water return pipe; 173-upper shell; 174-bottle cap; 18-three-way joint; 181-air inlet end; 1811-bubble tube; 182-water inlet end; 183-mixing end; 1831-negative pressure closing port; 19-control module; 191-ICB; 192-control panel; 20-telescopic pull rod; 21-roller; 22-anti-slip support leg; 23-lifting handle; a-pipeline to be cleaned. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] refer to Figures 1 to 5 ,like Figures 1 to 5 An intelligent micro-bubble cleaning machine shown in the figure includes a shell 10 with a hollow interior forming a water storage chamber 11, a water inlet 12 connected to the water storage chamber 11 is provided on the top of the shell 10, and a water pump 13, an air pump 14, a water outlet joint 15, a return water joint 16 and a filter 17 are provided on the shell 10; it also includes a three-way joint 18 for connecting the water outlet of the water pump 13, the air outlet of the air pump 14 and the water outlet joint 15; the return water joint 16 is connected to the inlet of the filter 17, and the outlet of the filter 17 is connected to the water storage chamber 11; it also includes a control module 19 for controlling the operation of the water pump 13 and the air pump 14.

[0037] In the above structure, water is injected into the water storage chamber 11 of the housing 10, and water and air are respectively injected into the three-way joint 18 through the water pump 13 and the air pump 14 to mix and then output from the water outlet joint 15. The water outlet joint 15 and the water return joint 16 can be quick-release joints, which are respectively connected to the head and tail of the pipeline a to be cleaned. When water mixed with air enters the pipeline a to be cleaned, the water containing a large number of bubbles can achieve frequent blasting force in the pipeline, and at the same time can generate vortex force and increase the friction force of the pipe wall in a large range. Under the joint action of the above three forces, the dirt in the pipeline a to be cleaned can be quickly peeled off, so that the pipeline is clean. Washing is faster, more thorough and safer. The control module 19 is used to control the start and stop and adjustment of the water pump 13 and the air pump 14, so as to achieve the purpose of adjusting the water pressure and water flow of the water pump 13, the air pressure and air flow of the air pump 14, and at the same time, the water flow and water pressure of the water pump 13, the air pressure of the air pump 14 and the fixed ratio of the air flow are intelligently adjusted. The sewage generated after the water of the water outlet joint 15 passes through the pipeline a to be cleaned flows to the return water joint 16, enters the filter 17 for filtration, and then is discharged back to the water storage chamber 11 for recycling, which effectively reduces the waste of water resources and avoids the problems of large water reserve and inconvenient movement of the cleaning machine.

[0038] In this embodiment, the ratio of the water pressure pumped by the water pump 13 to the air pressure pumped by the air pump 14 to the three-way joint 18 is between 10:9 and 10:6; at the same time, the ratio of the volume of water pumped by the water pump 13 to the volume of air pumped by the air pump 14 to the three-way joint 18 is between 10:8 and 10:5.

[0039] In the above structure, the ratio of water pressure to air pressure is preferably 10:7.5; the ratio of water volume to air volume is preferably 10:6.5. The actual ratio and pressure can be adjusted according to the length of the pipeline a to be cleaned, the amount of internal dirt, and the diameter of the pipeline.

[0040] In this embodiment, a one-way valve 141 is provided between the air pump 14 and the three-way connector 18 , which opens when air is supplied toward the three-way connector 18 .

[0041] In the above structure, since the water pressure of the water pump 13 is higher than that of the air pump 14 , in order to prevent the water flow from flowing back to the air pump 14 due to blockage caused by dirt downstream of the water outlet joint 15 and causing damage to the air pump 14 , a one-way valve 141 is provided to protect the air pump 14 .

[0042] In this embodiment, an exhaust valve 131 is provided at the water outlet of the water pump 13 .

[0043] In the above structure, the exhaust valve 131 can be used to exhaust the air in the water pump 13. If the exhaust valve 131 is cancelled, there will be air in the impeller of the water pump 13, which may cause it to run idle, thereby causing the water pump 13 to fail to produce water. At the same time, the control module 19 controls the air pump 14 to start later than the water pump 13 (5 seconds) to ensure that the water pump 13 can supply water normally before mixing in air, which also effectively prevents the water pump 13 from running idle.

[0044] In this embodiment, a telescopic pull rod 20 is provided at the rear side of the housing 10 , a roller 21 is provided at the bottom of the rear side of the housing 10 , and an anti-slip support leg 22 is provided at the front side of the housing 10 .

[0045] In the above structure, the telescopic pull rod 20 cooperates with the roller 21, so that the cleaning machine can be moved as easily as a suitcase; at the same time, concave lifting handles 23 are provided on both sides of the shell 10 to facilitate carrying and moving.

[0046] In this embodiment, a concave water collecting tank 111 is provided at the bottom of the water storage chamber 11 , and the suction port of the water pump 13 is located in the water collecting tank 111 .

[0047] In the above structure, since the liquid level near the suction port of the water pump 13 will be lower than the liquid level away from the suction port when the water pump 13 is pumping, the horizontal height of the water collecting tank 111 is lower than the bottom of the water storage chamber 11, which can effectively collect the water in the water storage chamber 11 for the water pump 13 to pump, thereby avoiding the situation where the water level changes due to the lowering of the water level or the vibration of the outer shell 10, causing the air to be sucked in and affecting the water-gas mixing ratio.

[0048] In this embodiment, the housing 10 is further provided with a sewage outlet 101 connected to the water collecting tank 111 .

[0049] In the above structure, the sewage outlet 101 is used to empty the water storage chamber 11, and a sewage valve (not shown in the figure) or a sewage plug (not shown in the figure) can be provided on the sewage outlet 101 for blocking.

[0050] In this embodiment, the control module 19 includes an integrated circuit board 191 and a control panel 192 , and the housing 10 is provided with an integrated circuit board mounting position 102 and a control panel mounting position 103 .

[0051] In the above structure, the control panel 192 is used to control the integrated circuit board 191 to start and stop the water pump 13 and the air pump 14 and to adjust the flow and pressure of the two.

[0052] In this embodiment, the control panel installation position 103 is located on the top of the housing 10 .

[0053] In the above structure, the control panel installation position 103 is located at the top of the housing 10. After the control panel 192 is installed, the risk of water splashing can be reduced as much as possible, and it is also easy to operate.

[0054] In this embodiment, the three-way joint 18 includes an air inlet end 181 connected to the air pump 14, a water inlet end 182 connected to the water pump 13, and a mixing end 183 connected to the water outlet joint 15; the air inlet end 181 and the mixing end 183 are coaxially arranged, and the inner wall of the mixing end 183 is provided with a negative pressure port 1831, and the air inlet end 181 is provided with a bubble tube 1811, and the bubble tube 1811 extends toward the mixing end 183 and crosses the negative pressure port 1831.

[0055] In the above structure, the cross-sectional flow rate of the inner wall of the mixing end 183 is reduced by setting the negative pressure closing port 1831 to increase the flow rate, so that the air entering the bubble tube 1811 can be mixed more evenly, thereby improving the water vapor mixing effect.

[0056] In this embodiment, the filter 17 includes a filter element 171 and a lower shell 172 located in the housing 10 and exposed to an upper shell 173 of the housing 10. The upper shell 173 is transparent. The filter element 171 is installed in the lower shell 172 and the upper shell 173. A detachable bottle cap 174 is provided on the top of the upper shell 173. The side wall of the filter 17 is connected to the return water joint 16, so that sewage enters between the inner wall of the lower shell 172, the upper shell 173 and the outer wall of the filter element 171 for filtration. A return water pipe 1721 connecting the water storage chamber 11 and the inner cavity of the filter element 171 is provided at the bottom of the lower shell 172, so that clean water filtered by the filter element 171 enters the water storage chamber 11 for reuse.

[0057] In the above structure, the transparent upper shell 173 is convenient for observing the filtering and clogging conditions of the filter element 171, and the detachable bottle cap 174 is convenient for replacing or cleaning the filter element 171. The upper shell 173 is preferably made of transparent polycarbonate material. The filter element 171 can filter out impurities with a diameter greater than 1 micron contained in the sewage, thereby ensuring the cleanliness of the water circulation and avoiding secondary damage to the pipeline a and the water pump 13 to be cleaned by impurities that fall off during cleaning.

[0058] The beneficial effects of the present invention are as follows: water is injected into the water storage chamber 11 of the shell 10, and water and air are respectively injected into the three-way joint 18 through the water pump 13 and the air pump 14 for mixing and then output from the water outlet joint 15. The water outlet joint 15 and the return water joint 16 can be quick-release joints, which are respectively connected to the head and tail of the pipeline a to be cleaned. When water mixed with air enters the pipeline a to be cleaned, the water containing a large number of bubbles can achieve frequent blasting force in the pipeline, and can also generate vortex force and increase the friction of the pipe wall on a large scale. Under the joint action of the above three forces, the dirt in the pipeline a to be cleaned can be quickly peeled off, making the pipeline cleaning faster, more thorough and safer. The control module 19 is used to control the start and stop and adjustment of the water pump 13 and the air pump 14, so as to adjust the water pressure and water flow rate of the water pump 13, and the air pressure and air flow rate of the air pump 14. The purpose is to intelligently adjust and control the water flow and water pressure of the water pump 13, the fixed ratio of the air pressure and air flow of the air pump 14, the sewage generated by the water at the water outlet joint 15 after passing through the pipeline a to be cleaned flows to the return water joint 16, enters the filter 17 for filtration and then is discharged back to the water storage chamber 11 for recycling, which effectively reduces the waste of water resources and avoids the problems of large water reserve and inconvenient movement of the cleaning machine; its working pressure is generally limited to within 4 bar (it can be increased or decreased according to the actual state of the pipeline). Since the air is mixed with water and flows in the pipeline a to be cleaned, there is no water hammer effect of the pulse cleaning machine. Compared with the working pressure of more than 8 bar of the pulse cleaning machine, combined with the water hammer effect and the resonance principle, the actual pressure in the pipeline to be cleaned may be more than ten times of 8 bar, so the safety of the pipeline can be effectively protected.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the scope of protection of the present invention.

Claims

1. An intelligent micro-bubble cleaning machine, comprising a shell with a hollow interior forming a water storage cavity, a water inlet connected to the water storage cavity is provided at the top of the shell, and is characterized in that: The shell is provided with a water pump, an air pump, a water outlet joint, a water return joint and a filter; it also includes a three-way joint for connecting the water outlet of the water pump, the air outlet of the air pump and the water outlet joint; the water return joint is connected to the inlet of the filter, and the outlet of the filter is communicated with the water storage chamber; it also includes a control module for controlling the operation of the water pump and the air pump; the ratio of the water pressure pumped to the three-way joint by the water pump and the air pressure pumped to the three-way joint by the air pump is between 10:9 and 10:6; at the same time, the ratio of the volume of water pumped to the three-way joint by the water pump and the volume of air pumped to the three-way joint by the air pump is between 10:8 and 10:5; the three-way joint includes an air inlet end connected to the air pump, a water inlet end connected to the water pump and a mixing end connected to the water outlet joint; the air inlet end and the mixing end are coaxially arranged, the inner wall of the mixing end is provided with a negative pressure closing port, the air inlet end is provided with a bubble tube, and the bubble tube extends toward the mixing end and crosses the negative pressure closing port; the control module controls the air pump to start 5 seconds later than the water pump.

2. The intelligent micro-bubble cleaning machine according to claim 1, characterized in that: A one-way valve is provided between the air pump and the three-way joint, which opens when air is supplied toward the three-way joint.

3. An intelligent micro-bubble cleaning machine according to claim 1 or 2, characterized in that: An exhaust valve is arranged at the water outlet of the water pump.

4. The intelligent micro-bubble cleaning machine according to claim 1, characterized in that: A telescopic pull rod is arranged on the rear side of the shell, a roller is arranged on the bottom of the rear side of the shell, and an anti-skid supporting leg is arranged on the front side of the shell.

5. The intelligent micro-bubble cleaning machine according to claim 1, characterized in that: A concave water collecting tank is provided at the bottom of the water storage cavity, and the suction port of the water pump is located in the water collecting tank.

6. The intelligent micro-bubble cleaning machine according to claim 5, characterized in that: The shell is also provided with a sewage outlet connected with the water collecting tank.

7. The intelligent micro-bubble cleaning machine according to claim 1, characterized in that: The control module includes an integrated circuit board and a control panel, and the housing is provided with an integrated circuit board mounting position and a control panel mounting position.

8. The intelligent micro-bubble cleaning machine according to claim 1, characterized in that: The filter comprises a filter element and a lower shell located in an outer shell and an upper shell exposed from the outer shell, the upper shell is transparent, the filter element is installed in the lower shell and the upper shell, and a detachable bottle cap is provided on the top of the upper shell; the side wall of the filter is connected to the return water joint, so that sewage enters between the lower shell, the inner wall of the upper shell and the outer wall of the filter element for filtration, and a return water pipe connecting the water storage cavity and the inner cavity of the filter element is provided at the bottom of the lower shell, so that clean water filtered by the filter element enters the water storage cavity for reuse.

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