Micro-bubble self-cleaning water purifier

Abstract

The utility model discloses a micro-bubble self-cleaning water purifier which comprises a first water inlet pipeline, a second water inlet pipeline, a membrane filter element, a first water path switch, a supercharging device, a second water path switch, a third water path switch and an air suction device, the first waterway switch, the supercharging device and the second waterway switch are sequentially arranged on the first water inlet pipeline in the water flow direction, one end of the second water inlet pipeline is connected to the position, corresponding to a water inlet of the first waterway switch, of the first water inlet pipeline, and the other end of the second water inlet pipeline is connected to the position, corresponding to a water outlet of the first waterway switch, of the first water inlet pipeline. The third waterway switch and the air suction device are sequentially arranged on the second water inlet pipeline in the water flow direction. By adopting the design mode, impurities such as scale on the membrane surface of the membrane filter element can be cleaned by utilizing local high temperature, high pressure and high impact force generated by collapse of microbubbles, the flux of the membrane filter element is recovered, and the service life of the membrane filter element is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water purifiers, in particular to a micro-bubble self-cleaning water purifier. Background Art

[0002] As people's living standards improve, they pay more and more attention to water quality and hygiene, and water purifiers have become an indispensable household appliance in people's lives. However, current water purifiers have the following shortcomings: on the one hand, after a period of use, the particles, colloids, and scale produced by water production in conventional water purifiers will contaminate the membrane surface. The contamination of the membrane surface will reduce the effective area of ​​membrane water production and increase the water production resistance. The result is that the water flux of the membrane filter element is reduced, the amount of pure water is reduced, and water is wasted; on the other hand, the effect of conventional membrane flushing and tap water flushing on extending the life of the membrane filter element is very limited, and the life of the membrane filter element is reduced. Utility Model Content

[0003] In order to overcome at least one defect of the above-mentioned prior art, the utility model provides a microbubble self-cleaning water purifier to solve the problem that the existing water purifier will be clogged with dirt after being used for a period of time, resulting in a decrease in the pure wastewater ratio of the membrane effluent and a shortened life of the membrane filter element.

[0004] The utility model is a technical solution adopted to solve the problem. In the first aspect, an embodiment of the utility model discloses a microbubble self-cleaning water purifier, including a first water inlet pipe, a second water inlet pipe, a membrane filter element, a first water circuit switch, a boosting device, a second water circuit switch, a third water circuit switch and an air suction device, the first water inlet pipe is connected to the membrane filter element, the first water circuit switch, the boosting device and the second water circuit switch are arranged on the first water inlet pipe in sequence along the water flow direction, one end of the second water inlet pipe is connected to a position on the first water inlet pipe corresponding to the water inlet of the first water circuit switch, and the other end is connected to a position on the first water inlet pipe corresponding to the water outlet of the first water circuit switch, the third water circuit switch and the air suction device are arranged on the second water inlet pipe in sequence along the water flow direction.

[0005] As an optional implementation, in an embodiment of the utility model, the micro-bubble self-cleaning water purifier also includes a first check valve, and the first check valve is arranged at the air inlet of the air suction device.

[0006] As an optional implementation, in an embodiment of the utility model, the micro-bubble self-cleaning water purifier also includes an air pump, and the air pump is arranged at the air inlet of the air suction device.

[0007] As an optional implementation, in an embodiment of the utility model, the microbubble self-cleaning water purifier also includes a pressure reducing device, which is arranged in the second water inlet pipeline and located between the third water circuit switch and the air suction device.

[0008] As an optional implementation, in an embodiment of the utility model, the microbubble self-cleaning water purifier also includes a concentrated water pipeline and a fourth water circuit switch, the concentrated water pipeline is connected to the concentrated water outlet of the membrane filter element, and the fourth water circuit switch is arranged on the concentrated water pipeline.

[0009] As an optional implementation, in an embodiment of the utility model, the microbubble self-cleaning water purifier also includes a current limiting device, one end of the current limiting device is connected to a position on the first water inlet pipe corresponding to the water inlet of the second water circuit switch, and the other end is connected to a position on the first water inlet pipe corresponding to the water outlet of the second water circuit switch.

[0010] As an optional implementation, in the embodiment of the utility model, the micro-bubble self-cleaning water purifier further includes a current limiting device, a drainage pipeline, a fifth water channel switch and a concentrated water pipeline;

[0011] One end of the current limiting device is connected to a position on the first water inlet pipeline corresponding to the water inlet of the second water circuit switch, and the other end of the current limiting device is connected to the concentrated water outlet of the membrane filter element;

[0012] The concentrated water pipeline is connected to the concentrated water outlet of the membrane filter element;

[0013] One end of the drainage pipeline is connected to a position on the first water inlet pipeline corresponding to the water inlet of the membrane filter element, the other end of the drainage pipeline is connected to the concentrated water pipeline, and the fifth water circuit switch is arranged on the drainage pipeline.

[0014] As an optional implementation, in the embodiment of the utility model, the microbubble self-cleaning water purifier also includes a waste water plug, and the waste water plug is arranged on the concentrated water pipeline.

[0015] As an optional implementation, in an embodiment of the utility model, the microbubble self-cleaning water purifier also includes a second check valve, and the second check valve is arranged at a position on the drainage pipeline corresponding to the water inlet of the fifth water circuit switch.

[0016] As an optional implementation, in an embodiment of the utility model, the microbubble self-cleaning water purifier also includes an air dissolving device, which is arranged on the first water inlet pipeline and located between the boosting device and the second water circuit switch.

[0017] Implementing the embodiments of the present utility model will have the following beneficial effects:

[0018] The utility model is provided with a microbubble self-cleaning water purifier including a first water inlet pipeline, a second water inlet pipeline, a membrane filter element, a first water circuit switch, a pressure boosting device, a second water circuit switch, a third water circuit switch and an air suction device, wherein the first water inlet pipeline is connected to the membrane filter element, the first water circuit switch, the pressure boosting device and the second water circuit switch are sequentially arranged on the first water inlet pipeline along the water flow direction, one end of the second water inlet pipeline is connected to a position on the first water inlet pipeline corresponding to the water inlet of the first water circuit switch, and the other end is connected to a position on the first water inlet pipeline corresponding to the water outlet of the first water circuit switch, and the third water circuit switch and the air suction device are sequentially arranged on the second water inlet pipeline along the water flow direction. With such a design, when the membrane filter element is used for a period of time and is contaminated by impurities such as scale, the microbubble self-cleaning water purifier starts self-cleaning, prepares water containing microbubbles and passes into the membrane filter element, and utilizes the local high temperature, high pressure and high impact force generated by the collapse of microbubbles to clean impurities such as scale on the membrane surface of the membrane filter element, thereby restoring the flux of the membrane filter element and improving the service life of the membrane filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 The structure of the micro-bubble self-cleaning water purifier in the first embodiment of the utility model is shown in FIG. Figure 1 ;

[0021] Figure 2 The structure of the micro-bubble self-cleaning water purifier in the second embodiment of the utility model is shown in FIG. Figure 2 ;

[0022] Figure 3 The structure of the micro-bubble self-cleaning water purifier in the third embodiment of the present utility model is shown in FIG. Figure 3 ;

[0023] Figure 4 The structure of the micro-bubble self-cleaning water purifier in the fourth embodiment of the utility model is shown in FIG. Figure 4 ;

[0024] Figure 5 The structure of the micro-bubble self-cleaning water purifier in the fifth embodiment of the present utility model is shown in FIG. Figure 5 ;

[0025] Figure 6 The structure of the micro-bubble self-cleaning water purifier in the sixth embodiment of the utility model is shown in FIG. Figure 6 .

[0026] The meanings of the reference numerals are as follows:

[0027] 1-first water inlet pipeline; 2-second water inlet pipeline; 3-membrane filter element; 4-first water circuit switch; 5-boosting device; 6-second water circuit switch; 7-third water circuit switch; 8-air suction device; 9-first check valve; 10-air pump; 11-pressure reducing device; 12-concentrated water pipeline; 13-drinking water pipeline; 14-fourth water circuit switch; 15-current limiting device; 16-drainage pipeline; 17-fifth water circuit switch; 18-wastewater plug; 19-second check valve; 20-dissolving device. DETAILED DESCRIPTION

[0028] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] Embodiment 1

[0032] See also Figure 1 The embodiment of the utility model discloses a microbubble self-cleaning water purifier. The microbubble self-cleaning water purifier of the present scheme comprises a first water inlet pipeline 1, a second water inlet pipeline 2, a membrane filter element 3, a first water circuit switch 4, a boosting device 5, a second water circuit switch 6, a third water circuit switch 7 and an air suction device 8. The first water inlet pipeline 1 is connected to the membrane filter element 3, the first water circuit switch 4, the boosting device 5 and the second water circuit switch 6 are sequentially arranged on the first water inlet pipeline 1 along the water flow direction, one end of the second water inlet pipeline 2 is connected to a position on the first water inlet pipeline 1 corresponding to the water inlet of the first water circuit switch 4, and the other end is connected to a position on the first water inlet pipeline 1 corresponding to the water outlet of the first water circuit switch 4, and the third water circuit switch 7 and the air suction device 8 are sequentially arranged on the second water inlet pipeline 2 along the water flow direction.

[0033] Among them, microbubbles are tiny bubbles with a diameter of less than 50 micrometers (μm) when bubbles occur, and can also be called micro-nano bubbles, micron bubbles or nano bubbles according to their diameter range. The microbubbles in this embodiment are preferably micro-nano bubbles.

[0034] Among them, the first water circuit switch 4 and the third water circuit switch 7 include a fully closed state and a fully open state, and the first water circuit switch 4 and the third water circuit switch 7 are solenoid valves, etc.; the boosting device 5 is used to increase the pressure of the incoming water to achieve the normal water production pressure of the membrane filter element 3, and the boosting device 5 is a diaphragm pump, etc.; the second water circuit switch 6 includes a flow limiting state or a fully open state. The function of the flow limiting state of the second water circuit switch 6 is to limit the flow and hold the pressure of the water in the flow channel. When the water dissolved in air flows through the second water circuit switch 6, the gas dissolved in the water will precipitate to form micro-bubble water. The second water circuit switch 6 is a concentrated water solenoid valve, etc.; the function of the air suction device 8 is to inhale a certain amount of air into the second water inlet pipeline 2. The water inlet of the air suction device 8 is connected to tap water, and its water outlet is connected to the water inlet of the boosting device 5. The air suction device 8 is a venturi tube that uses the Venturi effect to inhale air; the membrane filter element 3 can remove ions in water to prepare pure water. The membrane filter element 3 is a reverse osmosis membrane or a nanofiltration membrane, etc.

[0035] In some embodiments, the microbubble self-cleaning water purifier further includes a concentrate water pipeline 12 and a drinking water pipeline 13 , wherein the concentrate water pipeline 12 is connected to the concentrate water outlet of the membrane filter element 3 , and the drinking water pipeline 13 is connected to the drinking water outlet of the membrane filter element 3 .

[0036] When the microbubble self-cleaning water purifier of this scheme produces water: the first water circuit switch 4, the boosting device 5, and the second water circuit switch 6 are turned on, and the other water circuit switches and devices are turned off, the tap water enters the first water inlet pipe 1, is pressurized by the boosting device 5 after passing through the first water circuit switch 4, and flows through the second water circuit switch 6 to the membrane filter element 3, the pure water of the membrane filter element 3 flows to the drinking water pipe 13, and the concentrated water flows to the concentrated water pipe 12.

[0037] When the microbubble self-cleaning water purifier of the present scheme cleans the membrane filter element 3: the third water circuit switch 7, the air suction device 8 and the boosting device 5 are turned on, and the other water circuit switches are turned off, and the tap water enters the second water inlet pipe 2, flows through the third water circuit switch 7, and the air is sucked into the air suction device 8 and mixed into the tap water. The tap water containing air is pressurized by the boosting device 5 and then dissolved into the water. When it passes through the limiting flow of the second water circuit switch 6, the pressure drops sharply, and the air in the water is precipitated into microbubbles. After the water containing microbubbles flows to the membrane filter element 3, the pollutants attached to the surface of the membrane filter element 3 can be cleaned off, thereby restoring the flux of the membrane filter element 3, which can not only improve the life of the membrane filter element 3, but also save water. The concentrated water of the membrane filter element 3 flows to the concentrated water pipeline 12.

[0038] Among them, the principle of water containing microbubbles to clean the membrane surface dirt in the membrane filter element 3 is that the microbubbles will gradually collapse in the process of flowing through the membrane surface. When the microbubbles collapse, there will be a strong impact force locally. This impact force of collapse can impact the pollutants on the membrane surface, causing the pollutants on the membrane surface to fall off, thereby achieving the purpose of cleaning the membrane surface.

[0039] In some embodiments, the microbubble self-cleaning water purifier further includes a first check valve 9, which is disposed at the air inlet of the air suction device 8. With such a design, water on the second water inlet pipeline 2 can be prevented from being discharged from the air inlet.

[0040] The utility model provides a microbubble self-cleaning water purifier, which includes a first water inlet pipeline 1, a second water inlet pipeline 2, a membrane filter element 3, a first water circuit switch 4, a boosting device 5, a second water circuit switch 6, a third water circuit switch 7 and an air suction device 8. The first water inlet pipeline 1 is connected to the membrane filter element 3, the first water circuit switch 4, the boosting device 5 and the second water circuit switch 6 are sequentially arranged on the first water inlet pipeline 1 along the water flow direction, one end of the second water inlet pipeline 2 is connected to a position on the first water inlet pipeline 1 corresponding to the water inlet of the first water circuit switch 4, and the other end is connected to a position on the first water inlet pipeline 1 corresponding to the water outlet of the first water circuit switch 4, and the third water circuit switch 7 and the air suction device 8 are sequentially arranged on the second water inlet pipeline 2 along the water flow direction. With such a design, when the membrane filter element 3 is contaminated by impurities such as scale after being used for a period of time, the microbubble self-cleaning water purifier starts self-cleaning, prepares water containing microbubbles and passes it into the membrane filter element 3, and utilizes the local high temperature, high pressure, and high impact force generated by the collapse of the microbubbles to clean away impurities such as scale on the membrane surface of the membrane filter element 3, thereby restoring the flux of the membrane filter element 3 and increasing the service life of the membrane filter element 3.

[0041] Embodiment 2

[0042] See also Figure 2 The difference between the second embodiment and the first embodiment is that the microbubble self-cleaning water purifier further includes a pressure reducing device 11, which is arranged in the second water inlet pipeline 2 and between the third water circuit switch 7 and the air suction device 8. With such a design, the pressure reducing device 11 can reduce the water pressure entering the air suction device 8, control the water flow and air intake of the air suction device 8, and thus realize the regulation of the water flow and air intake of the air suction device 8.

[0043] Furthermore, the microbubble self-cleaning water purifier further includes a fourth water circuit switch 14, which is arranged on the concentrated water pipeline 12. The fourth water circuit switch 14 includes a current limiting state and a fully open state, and the fourth water circuit switch 14 is a concentrated water solenoid valve, etc. The fourth water circuit switch 14 is kept in a closed state during water production, at which time the current is limited and the pressure is held back to ensure normal water production; the fourth water circuit switch 14 is opened when the membrane filter element 3 is cleaned, and at this time it is in a fully open state.

[0044] When the microbubble self-cleaning water purifier of this scheme produces water: the first water circuit switch 4, the boosting device 5, and the second water circuit switch 6 are turned on, and the other water circuit switches and devices are turned off. The tap water passes through the first water circuit switch 4 and is pressurized by the boosting device 5 and then flows through the second water circuit switch 6 to the membrane filter element 3. The pure water in the membrane filter element 3 flows to the drinking water pipeline 13, and the concentrated water flows to the concentrated water pipeline 12. At this time, the fourth water circuit switch 14 limits the flow and holds back the pressure to ensure normal water production.

[0045] When the microbubble self-cleaning water purifier of the present scheme cleans the membrane filter element 3: the third water circuit switch 7, the pressure reducing device 11, the pressure increasing device 5, and the fourth water circuit switch 14 are turned on, and the other water circuit switches are turned off. The tap water flows through the third water circuit switch 7, and the water flow rate and air intake of the air intake device 8 are adjusted by the pressure reducing device 11. The air is sucked into the air intake device 8 and mixed into the tap water. The tap water containing air is pressurized by the pressure increasing device 5 and dissolved into the water. When the tap water passes through the current limiting device of the second water circuit switch 6, the pressure drops sharply, and the air in the water is precipitated into microbubbles. After the water containing microbubbles flows to the membrane filter element 3, the pollutants attached to the surface of the membrane filter element 3 can be cleaned off, thereby restoring the flux of the membrane filter element 3, which can not only improve the life of the membrane filter element 3, but also save water. The concentrated water of the membrane filter element 3 flows to the concentrated water pipeline 12.

[0046] The specific structural design of the microbubble self-cleaning water purifier in this embodiment can be referred to Example 1, and will not be described in detail here.

[0047] Embodiment 3

[0048] See also Figure 3 The difference between the third embodiment and the second embodiment is that the microbubble self-cleaning water purifier further includes an air pump 10, which is arranged at the air inlet of the air suction device 8. With such a design, the air pump 10 can increase the air intake pressure and air intake flow rate when the air suction device 8 is working, thereby improving the effect of producing microbubble water. The only difference between the third embodiment and the second embodiment is that the air pump 10 is turned on when the membrane filter element 3 is cleaned.

[0049] The specific structural design of the microbubble self-cleaning water purifier in this embodiment can be referred to Example 2, which will not be described in detail here.

[0050] Embodiment 4

[0051] See also Figure 4The difference between the fourth embodiment and the first embodiment is that the microbubble self-cleaning water purifier further includes a current limiting device 15, one end of which is connected to a position on the first water inlet pipeline 1 corresponding to the water inlet of the second water circuit switch 6, and the other end is connected to a position on the first water inlet pipeline 1 corresponding to the water outlet of the second water circuit switch 6. The second water circuit switch 6 includes a fully closed state and a fully open state, and the current limiting device 15 replaces the second water circuit switch 6 to limit the current, so that the air in the water is precipitated into microbubbles.

[0052] The specific structural design of the microbubble self-cleaning water purifier in this embodiment can be referred to Example 1, and will not be described in detail here.

[0053] Embodiment 5

[0054] See also Figure 5 The difference between the fifth embodiment and the first embodiment is that the microbubble self-cleaning water purifier also includes a flow limiting device 15, a drainage pipeline 16 and a fifth water circuit switch 17; one end of the flow limiting device 15 is connected to a position on the first water inlet pipeline 1 corresponding to the water inlet of the second water circuit switch 6, and the other end of the flow limiting device 15 is connected to the concentrate water outlet of the membrane filter element 3; one end of the drainage pipeline 16 is connected to a position on the first water inlet pipeline 1 corresponding to the water inlet of the membrane filter element 3, and the other end of the drainage pipeline 16 is connected to the concentrate water pipeline 12, and the fifth water circuit switch 17 is arranged on the drainage pipeline 16.

[0055] Furthermore, the microbubble self-cleaning water purifier also includes a wastewater plug 18, which is arranged on the concentrated water pipeline 12. In this embodiment, a portion of the microbubble water will also be discharged through the wastewater plug 18 to remove the dirt in the wastewater plug 18.

[0056] Furthermore, the microbubble self-cleaning water purifier further includes a second check valve 19, which is arranged on the drainage pipeline 16 at a position corresponding to the water inlet of the fifth waterway switch 17. With such a design, the concentrated water in the drainage pipeline 16 can be prevented from flowing back.

[0057] When the microbubble self-cleaning water purifier of this scheme produces water: the first water circuit switch 4, the boosting device 5, and the second water circuit switch 6 are turned on, and the other water circuit switches and devices are turned off, the tap water enters the first water inlet pipe 1, is pressurized by the boosting device 5 after passing through the first water circuit switch 4, and flows through the second water circuit switch 6 to the membrane filter element 3, the pure water of the membrane filter element 3 flows to the drinking water pipe 13, and the concentrated water flows to the concentrated water pipe 12.

[0058] When the microbubble self-cleaning water purifier of the present scheme cleans the membrane filter element 3: the third water circuit switch 7, the boosting device 5, the current limiting device 15, and the fifth water circuit switch 17 are turned on, and the other water circuit switches and devices are turned off. The tap water flows through the third water circuit switch 7, and after the air is sucked into the air suction device 8, it is pressurized by the boosting device 5. At this time, the air dissolves into the water, and then the pressure is reduced after passing through the current limiting device 15, and microbubbles are precipitated. A part of the water containing microbubbles flows from the concentrated water outlet into the membrane filter element 3. After cleaning the pollutants on the membrane surface, the final water is discharged from the water inlet and finally discharged into the concentrated water pipeline 12. The other part of the water containing microbubbles is discharged through the waste water plug 18 and finally discharged into the concentrated water pipeline 12 to deal with the dirt in the waste water plug 18. With such arrangement, microbubble water enters the filter element from the concentrated water port of the membrane filter element 3 and then flows out of the membrane filter element 3 from the water inlet. The concentrated water end of the membrane filter element 3 is generally more seriously polluted. Allowing microbubbles to enter from the concentrated water port is conducive to higher concentration microbubbles to treat the dirt at the concentrated water end, which is conducive to cleaning the dirt.

[0059] The specific structural design of the microbubble self-cleaning water purifier in this embodiment can be referred to Example 1, and will not be described in detail here.

[0060] Embodiment 6

[0061] See also Figure 6 The difference between the sixth embodiment and the first embodiment is that the microbubble self-cleaning water purifier further includes a gas dissolving device 20, which is arranged on the first water inlet pipeline 1 and between the boosting device 5 and the second water circuit switch 6. With such a design, the gas dissolving device 20 can dissolve the air sucked in by the air suction device 8 into water under high pressure, and then form microbubble water when the pressure is released through the second water circuit switch 6.

[0062] The specific structural design of the microbubble self-cleaning water purifier in this embodiment can be referred to Example 1, and will not be described in detail here.

[0063] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A microbubble self-cleaning water purifier, characterized in that: The invention comprises a first water inlet pipeline (1), a second water inlet pipeline (2), a membrane filter element (3), a first water circuit switch (4), a pressure-boosting device (5), a second water circuit switch (6), a third water circuit switch (7) and an air suction device (8); the first water inlet pipeline (1) is connected to the membrane filter element (3); the first water circuit switch (4), the pressure-boosting device (5) and the second water circuit switch (6) are arranged on the first water inlet pipeline (1) in sequence along the direction of water flow; one end of the second water inlet pipeline (2) is connected to a position on the first water inlet pipeline (1) corresponding to a water inlet of the first water circuit switch (4), and the other end is connected to a position on the first water inlet pipeline (1) corresponding to a water outlet of the first water circuit switch (4); the third water circuit switch (7) and the air suction device (8) are arranged on the second water inlet pipeline (2) in sequence along the direction of water flow.

2. The microbubble self-cleaning water purifier according to claim 1, characterized in that: The micro-bubble self-cleaning water purifier further comprises a first check valve (9), wherein the first check valve (9) is arranged at the air inlet of the air suction device (8).

3. The microbubble self-cleaning water purifier according to claim 1, characterized in that: The micro-bubble self-cleaning water purifier further comprises an air pump (10), and the air pump (10) is arranged at the air inlet of the air suction device (8).

4. The microbubble self-cleaning water purifier according to claim 1, characterized in that: The micro-bubble self-cleaning water purifier further comprises a pressure reducing device (11), wherein the pressure reducing device (11) is arranged in the second water inlet pipeline (2) and is located between the third water circuit switch (7) and the air suction device (8).

5. The microbubble self-cleaning water purifier according to claim 1, characterized in that: The microbubble self-cleaning water purifier further comprises a concentrated water pipeline (12) and a fourth water circuit switch (14); the concentrated water pipeline (12) is connected to the concentrated water outlet of the membrane filter element (3); and the fourth water circuit switch (14) is arranged on the concentrated water pipeline (12).

6. The microbubble self-cleaning water purifier according to claim 1, characterized in that: The microbubble self-cleaning water purifier further comprises a flow limiting device (15), one end of the flow limiting device (15) being connected to a position on the first water inlet pipeline (1) corresponding to a water inlet of the second water circuit switch (6), and the other end of the flow limiting device (15) being connected to a position on the first water inlet pipeline (1) corresponding to a water outlet of the second water circuit switch (6).

7. The microbubble self-cleaning water purifier according to claim 1, characterized in that: The microbubble self-cleaning water purifier further comprises a flow limiting device (15), a drainage pipeline (16), a fifth water channel switch (17) and a concentrated water pipeline (12); One end of the current limiting device (15) is connected to a position on the first water inlet pipeline (1) corresponding to the water inlet of the second water circuit switch (6), and the other end of the current limiting device (15) is connected to the concentrated water outlet of the membrane filter element (3); The concentrated water pipeline (12) is connected to the concentrated water outlet of the membrane filter element (3); One end of the drainage pipeline (16) is connected to a position on the first water inlet pipeline (1) corresponding to the water inlet of the membrane filter element (3), the other end of the drainage pipeline (16) is connected to the concentrated water pipeline (12), and the fifth water circuit switch (17) is arranged on the drainage pipeline (16).

8. The microbubble self-cleaning water purifier according to claim 7, characterized in that: The microbubble self-cleaning water purifier further comprises a waste water plug (18), wherein the waste water plug (18) is arranged on the concentrated water pipeline (12).

9. The microbubble self-cleaning water purifier according to claim 7, characterized in that: The micro-bubble self-cleaning water purifier further comprises a second check valve (19), wherein the second check valve (19) is arranged at a position on the drainage pipeline (16) corresponding to the water inlet of the fifth water circuit switch (17).

10. The microbubble self-cleaning water purifier according to claim 1, characterized in that: The microbubble self-cleaning water purifier further comprises an air dissolving device (20), wherein the air dissolving device (20) is arranged on the first water inlet pipeline (1) and is located between the pressure boosting device (5) and the second water circuit switch (6).

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