CN217378287U - Multistage microbubble washing machine - Google Patents

Abstract

The utility model discloses a multistage microbubble washing machine, include: a multiple stage microbubble washing machine comprising: the first bubble generating device and the at least one second bubble generating device are arranged in the water path of the washing machine; the first bubble generating device comprises a pipe body and a bubbler, the pipe body and the bubbler enclose to form a flow channel, and washing water is decompressed when flowing through the flow channel to form bubble water; the second bubble generating device is a controlled device and is used for mixing gas into the water channel so as to generate micro bubbles; the second bubble generating device is positioned at the rear end of the first bubble generating device; when the second bubble generating device is controlled to be opened or closed, bubble water with different bubble apertures can be formed through the combined action of the first bubble generating device and the second bubble generating device. The utility model effectively improves the microbubble generation efficiency, and conveniently and quickly obtains a large amount of microbubbles; and micro-bubble water with different bubble apertures can be formed in the water path of the washing machine so as to adapt to various washing procedures of the washing machine.

Description

Multistage microbubble washing machine

Technical Field

The utility model relates to a household electrical appliances technical field, concretely relates to multistage microbubble washing machine.

Background

Along with the improvement of living standard of people, people put forward higher and higher requirements on the washing water of the washing machine, and the washing water is required to have no pollution and certain effects of sterilization and the like.

The microbubble generator forms microbubble water from water mixed with gas such as air, and the microbubbles can locally generate high-pressure and high-temperature heat when being crushed, thereby destroying foreign matters such as organic matters floating in liquid or attached to an object.

Therefore, how to arrange the micro-bubble device in the washing machine to improve the washing and purifying capability of the washing machine is a problem to be solved.

Therefore, a multi-stage microbubble washing machine is needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a multi-stage microbubble washing machine which can effectively improve the microbubble generation efficiency and conveniently and quickly obtain a large amount of microbubble water in a short time; and micro-bubble water with different bubble apertures can be formed in the water path of the washing machine so as to adapt to various washing procedures of the washing machine.

The technical scheme of the utility model outline as follows:

a multiple stage microbubble washing machine comprising:

the first bubble generating device and the at least one second bubble generating device are arranged in the water path of the washing machine; wherein,

the first bubble generating device comprises a pipe body and a bubbler, the pipe body and the bubbler enclose to form a flow passage, and washing water is decompressed to form bubble water when flowing through the flow passage;

the second bubble generating device is a controlled device and is used for mixing gas into the water channel so as to generate micro bubbles;

the second bubble generating device is positioned at the rear end of the first bubble generating device;

when the second bubble generating device is controlled to be opened or closed, bubble water with different bubble apertures can be formed through the combined action of the first bubble generating device and the second bubble generating device.

Preferably, the density of the bubbles generated by the first bubble generation device is less than the density of the bubbles generated by the second bubble generation device.

Preferably, the waterway comprises a main waterway and at least one shunt waterway, the second bubble generation device is positioned in the main waterway, the first bubble generation device is positioned in the shunt waterway, and the shunt waterway provided with the first bubble generation device is provided with the electromagnetic valve.

Preferably, the water inlet of the first bubble generation device is arranged on the pipe body, the water outlet is arranged on the bubbler, and the radial sectional area of the flow channel gradually decreases from the water outlet to the water inlet.

Preferably, the bubbler comprises a base and a cone; the cone is of a hollow structure and extends from the base to the water inlet; the water outlet is arranged on the base.

Preferably, an impeller is formed on the outer wall of the bubbler, the impeller extends into the tube body, when the washing water mixed air flows through the bubbler, the impeller is driven to drive the bubbler to rotate, and the gap between the impeller and the inner wall of the tube body is changed in the rotating process of the impeller so as to form micro bubbles in the washing water.

Preferably, the second bubble generating device comprises a gas supply pipeline as a gas transportation channel and a bubbled stone communicated with the gas supply pipeline; the gas supply pipeline is connected with a gas pump, and gas generated by the gas pump is conveyed to the air bubble stone through the gas supply pipeline so as to generate micro bubbles in the washing water.

Preferably, the second bubble generating device comprises a mixing tank and a booster pump; wherein,

the mixing tank is communicated with the booster pump, the booster pump presses washing water into the mixing tank, the washing water entering the mixing tank is mixed with gas in the mixing tank to form bubble water, and the bubble water returns to the water path through the water outlet end of the mixing tank.

Preferably, the first bubble generating device is arranged at a water inlet valve end of the washing machine and/or a water inlet end of the detergent box and/or in the detergent box and/or at a drain pump.

Preferably, the second air bubble generating device is arranged at the water inlet valve end of the washing machine and/or the water inlet end of the detergent box and/or the lower corrugated pipe and/or the drain pump and/or the circulating spray pipeline.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model discloses set up first bubble generating device and second bubble generating device in the washing machine water route, wherein, first bubble generating device is enclosed to establish the runner that forms through its body and bubbler and is carried out the decompression to the rivers that mix with gas so as to decompose aquatic gas, thereby form bubble water, second bubble generating device introduces the gas and mixes in aqueous in order to produce the micro bubble; through using first bubble generating device and second bubble generating device in combination, can form a large amount of microbubbles in aqueous, effectively improve microbubble generation efficiency, realize obtaining a large amount of microbubble water convenient and fast in the short time.

2. By controlling the opening and closing of the second bubble generating device, micro-bubble water with different bubble apertures can be formed in the water path of the washing machine so as to adapt to various washing procedures of the washing machine.

3. The microbubble that enters into washing machine barrel can destroy the foreign matter such as the organic matter that floats in liquid or attach to on the object when broken, reaches clear purpose for washing machine can possess stronger washing and purification capacity, promotes the user and uses the experience and feel.

4. The micro bubbles can also effectively dissolve the detergent deposited at the bottom of the washing drum, so that the use and waste of the detergent are reduced.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings. The following examples and the accompanying drawings illustrate specific embodiments of the present invention.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without undue limitation to the invention. In the drawings:

FIG. 1 is a schematic structural view of a washing machine according to the present invention;

FIG. 2 is a first schematic view showing the connection relationship between the first bubble generating device and the second bubble generating device according to the present invention;

FIG. 3 is a schematic view of a connection relationship between the first bubble generating device and the second bubble generating device according to the present invention;

fig. 4 is a schematic view of an explosion structure of the first bubble generation device of the present invention;

FIG. 5 is a schematic view of the sectioning structure of the first bubble generating device of the present invention

Fig. 6 is a first schematic structural view of a second bubble generation device according to the present invention;

fig. 7 is a schematic structural diagram of a second bubble generating device according to the present invention.

In the figure: 1. a washing machine;

10. a first bubble generating device; 11. a tube body; 111. a first conduit; 1111. a water inlet; 112. a second conduit; 12. a bubbler; 121. a base; 1211. a water outlet; 122. a cone; 13. a flow channel;

20. a second bubble generating device; 21. a bubble stone; 22. a gas supply duct; 23. an air pump; 24. a mixing tank; 241. a water outlet end; 25. a booster pump; 26. a connection module; 261. a water inlet end;

30. a waterway; 31. a main waterway; 32. a diversion waterway; 33. an electromagnetic valve; 40. a water inlet valve end; 50. a detergent box; 51. a water inlet end of the detergent box; 60. a lower bellows; 70. draining pump; 80. and circulating the spraying pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the drawings, the shape and size may be exaggerated for clarity, and the same reference numerals will be used throughout the drawings to designate the same or similar components.

In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc., are defined with respect to the configurations shown in the respective drawings, and in particular, "height" corresponds to a dimension from top to bottom, "width" corresponds to a dimension from left to right, "depth" corresponds to a dimension from front to rear, which are relative concepts, and thus may be varied accordingly depending on the position in which it is used, and thus these or other orientations should not be construed as limiting terms.

Terms concerning attachments, coupling and the like (e.g., "connected" and "attached") refer to a relationship wherein structures are secured or attached, either directly or indirectly, to one another through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.

The embodiment of the utility model provides a multistage microbubble washing machine, combine fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7 to show, include:

a first bubble generating device 10 and at least one second bubble generating device 20 arranged in a water circuit 30 of the washing machine 1; wherein,

the first bubble generating device 10 comprises a tube 11 and a bubbler 12, the tube 11 and the bubbler 12 enclose to form a flow channel 13, and the washing water is decompressed to form bubble water when flowing through the flow channel 13;

the second bubble generating device 20 is a controlled device for mixing gas into the water path to generate micro bubbles;

the second bubble generation device 20 is positioned at the rear end of the first bubble generation device 10;

when the second bubble generating device 20 is controlled to be opened or closed, bubble water with different bubble apertures can be formed through the cooperation of the first bubble generating device 10 and the second bubble generating device 20.

Specifically, the first bubble generating device 10 comprises a tube 11 and a bubbler 12, a space for accommodating the bubbler 12 is arranged in the tube 11, the bubbler 12 is detachably mounted in the space, after the assembly is completed, a gap is formed between the outer side wall of the bubbler 12 and the inner wall of the tube 11, the gap is communicated with the water inlet 1111 and the water outlet 1211 of the first bubble generating device 10 to form a flow passage 13 for passing through washing water, so that the washing water flowing from the water inlet 1111 end flows to the water outlet 1211 through the flow passage 13 and flows out of the first bubble generating device 10 from the water outlet 1211; since the width of the flow passage 13 is smaller than that of the water passage 30, when the washing water flows into the flow passage 13 of the first bubble generating device 10, fluid pressure is generated and released during the flow, so that the gas mixed in the water flow is released, i.e., uniform micro-bubble water is formed when the washing water is sprayed from the water outlet 1211. The structure is simple, the assembly difficulty is reduced, the process can be realized under smaller pressure, and high-quality micro-bubble water can be conveniently and quickly obtained.

Wherein, the utility model adopts the way that the second bubble generating device 20 and the first bubble generating device 10 are matched with each other, namely the second bubble generating device 20 and the first bubble generating device 10 are installed in the water path 30 of the washing machine 1 as a combination; when the device is used, the second bubble generation device 20 can introduce and mix gas into the washing water, the washing water firstly flows into the first bubble generation device 10 to form bubble water, and then the gas is introduced and mixed by the second bubble generation device 20 to form micro-bubble water with different bubble apertures in a superposition manner.

The utility model discloses a second bubble generating device 20 and first bubble generating device 10 are used in the combination, can form a large amount of microbubbles in aqueous, effectively improve microbubble generation efficiency, realize convenient and fast and obtain a large amount of microbubble water.

Meanwhile, the diameters and densities of the bubbles generated by the first bubble generation device 10 and the second bubble generation device 20 are different, wherein the second bubble generation device 20 is a controllable switch, and whether the second bubble generation device 20 generates bubbles in the washing water is controlled by controlling the on and off of the second bubble generation device 20, so that micro bubbles with different diameters are formed in the water path 30 of the washing machine 1, and various washing procedures of the washing machine 1 are adapted.

Thus, during use:

when the second bubble generating device 20 is turned on, the washing water flows through the second bubble generating device 20 and the first bubble generating device 10, that is, the washing water contains the micro-bubbles generated by the first bubble generating device 10 and the second bubble generating device 20;

when the second bubble generating device 20 is turned off, the washing water only flows through the first bubble generating device 10, that is, the washing water only contains the bubbles generated by the first bubble generating device 10;

the micro-bubbles entering the barrel of the washing machine 1 can break foreign matters such as organic matters floating in liquid or attached to objects while being broken, so that the purpose of cleaning is achieved, the washing machine 1 can have strong washing and purifying capabilities, and the use experience of a user is improved.

Moreover, the micro bubbles can also effectively dissolve the detergent deposited at the bottom of the washing drum, so that the use and waste of the detergent are reduced.

Further, the density of the generated bubbles of the first bubble generation device 10 is smaller than that of the generated bubbles of the second bubble generation device 20, i.e. the pore diameter of the generated bubbles of the first bubble generation device 10 is smaller than that of the generated bubbles of the second bubble generation device 20. By controlling the opening and closing of the second bubble generation device 20, bubble water with different bubble apertures can be generated in the water path 30 to adapt to different washing programs of the washing machine.

Example one

As shown in fig. 3, the water path 30 includes a main water path 31 and at least one branch water path 32, the second bubble generation device 20 is located in the main water path 31, the first bubble generation device 10 is located in the branch water path 32, and the branch water path 32 provided with the first bubble generation device 10 is provided with an electromagnetic valve 33. Specifically, the electromagnetic valve 33 is used to control the communication and closing of the diversion waterway 32 and the main waterway 31, when the electromagnetic valve 33 is opened, it indicates that the diversion waterway 32 is communicated with the main waterway 31, and at this time, the washing water flows through the first bubble generation device 10 located on the diversion waterway 32; when the solenoid valve 33 is closed, it indicates that the branch water path 32 is disconnected from the main water path 31, and the washing water does not pass through the branch water path 32, i.e. the first bubble generating device 10 does not operate.

In the using process:

when the second bubble generating device 20 is opened and the electromagnetic valve 33 is opened, the washing water flows through the first bubble generating device 10 and the second bubble generating device 20 to form micro-bubble water;

when the second bubble generating device 20 is opened and the electromagnetic valve 33 is closed, the washing water only flows through the second bubble generating device 20 to form bubble water;

when the second bubble generation device 20 is closed and the electromagnetic valve 33 is opened, the second bubble generation device 20 does not work, and the washing water only flows through the first bubble generation device 10 to form bubble water;

when the second bubble generating device 20 is closed and the electromagnetic valve 33 is closed, the second bubble generating device 20 and the first bubble generating device 10 are not operated, and the washing water is a normal water flow.

This embodiment is through setting up solenoid valve 33, can control the trend of water route 30 and use the selective washing water of supplying different grade type for washing machine 1 to improve the variety of product function, promote user's use and experience the sense.

Example two

In one embodiment, as shown in fig. 4 and 5, the water inlet 1111 of the first bubble generation device 10 is disposed on the tube 11, the water outlet 1211 is disposed on the bubbler 12, and the cross-sectional area of the flow channel 13 in the radial direction gradually decreases from the water outlet 1211 to the water inlet 1111.

Further, the bubbler 12 includes a base 121 and a cone 122; wherein, the cone 122 is a hollow structure, and the cone 122 extends from the base 121 to the water inlet 1111; the water outlet 1211 is disposed on the base 121.

Specifically, the pipe 11 includes a first pipe 111 and a second pipe 112, the first pipe 111 is cylindrical, the second pipe 112 has a certain taper, and the second pipe 112 forms an accommodating space of the bubbler 12. Wherein, the first pipe 111 forms the water inlet 1111 of the first bubble generating device 10, the accommodating space of the second pipe 112 is adapted to the bubbler 12, when the bubbler 12 is placed in the second pipe 112, a gap is formed between the outer side wall of the bubbler 12 and the inner wall of the second pipe 112, and the gap and the first pipe 111 together form the flow channel 13.

When the first bubble generating device 10 works, the washing water enters the first pipeline 111 from the water inlet 1111, then flows into the gap formed by the surrounding of the bubbler 12 and the second pipeline 112, then reaches the water outlet 1211 of the bubbler 12, and releases pressure when being sprayed out through the water outlet 1211, so as to form micro-bubble water.

Wherein, the first pipe 111 is also provided to facilitate the fixed connection with the water inlet structure of the washing machine 1, thereby realizing the rapid water inlet.

Furthermore, the diameter of the second pipe 112 with a certain taper is gradually reduced to be equal to the diameter of the first pipe 111 along the direction from the water outlet 1211 to the water inlet 1111, after the bubbler 12 and the second pipe 112 are assembled, because the sectional area of the first pipe 111 in the radial direction is larger than that of the gap formed between the second pipe 112 and the bubbler 12, the washing water in the first pipe 111 is pressurized in a certain range, and when the pressurized washing water enters the gap, the pressure is released in the flowing process, so that the gas mixed in the water flow is released, that is, when the washing water is sprayed out from the water outlet 1211, micro-bubble water can be formed.

The cone 122 is matched with the shape of the second pipeline 112, so that the assembly difficulty is reduced; in this embodiment, when the cone 122 is disposed in the second pipe 112, the distance between the outer side wall of the cone 122 and the inner side wall of the second pipe 112 in the radial direction gradually increases along the direction from the water inlet 1111 to the water outlet 1211, which is beneficial to fully release the pressure of the washing water mixed with gas during the flowing process in the gap, so that the washing water forms more uniform and dense micro-bubbles when being output from the water outlet 1211. The cone 122 is a hollow structure, so that the overall weight of the first bubble generation device 10 can be reduced, and the cost can be reduced. Further, the cone 122 can reduce the resistance of the water flow, and can guide the flow of the washing water.

EXAMPLE III

An impeller is formed on the outer wall of the bubbler 12 and extends into the tube body 11, when the washing water mixed air flows through the bubbler 12, the impeller is driven to drive the bubbler 12 to rotate, and the gap between the impeller and the inner wall of the tube body 11 is changed in the rotating process of the impeller so as to form micro bubbles in the washing water. On the one hand, release pressure is in order to form the bubble when making rivers flow through this clearance, on the other hand, blade on the impeller can play the gas release that the cutting crushing effect made aquatic dissolve in order to generate the microbubble to the washing water through high-speed rotation, and the effect of impeller cutting bubble has also been strengthened to the hydraulic shear force of rotatory production, effectively improve microbubble generation efficiency, can form the even microbubble of a large amount of distributions, and simultaneously, the rotation effect of impeller also can prevent gathering together the condition of bubble, realize convenient and fast and obtain high-quality microbubble water.

Wherein the impeller may be integrally formed with the bubbler 12 or may be nestingly mounted to the bubbler 12.

Example four

As shown in fig. 6, the second bubble generating means 20 includes a gas supply duct 22 as a gas transport passage and a bubblestone 21 communicating with the gas supply duct 22; the gas supply duct 22 is connected with a gas pump 23, and gas generated by the gas pump 23 is delivered to the air bubble stone 21 through the gas supply duct 22 to generate micro bubbles in the washing water.

Specifically, it adopts air pump 23 and gas supply line 22 complex mode, with air delivery to the air bubble stone 21 that is arranged in water route 30, gaseous a plurality of miniature bleeder vents that pass through on the air bubble stone 21 discharge to the rivers in to form a large amount of miniature bubbles in aqueous, this simple structure and reduce cost have effectively improved microbubble generation efficiency, can form the even microbubble of a large amount of distributions in the short time, realize that convenient and fast obtains a large amount of little bubble water.

Wherein, the air bubble stone 21 is sand stone formed by high-temperature sintering, a plurality of micro air holes are arranged inside the sand stone, gas is discharged from the air holes and enters water flow to form micro bubbles, and the air outlet of the air bubble stone 21 is more uniform and refined.

EXAMPLE five

As shown in fig. 7, the second bubble generating device 20 includes a mixing tank 24, a pressurizing pump 25; wherein,

the mixing tank 24 is communicated with a booster pump 25, the booster pump 25 presses washing water into the mixing tank 24, the washing water entering the mixing tank 24 is mixed with gas in the mixing tank 24 to form bubble water, and the bubble water returns to the water path 30 through a water outlet end 241 of the mixing tank 24.

The second bubble generation device 20 further comprises a connection module 26, the booster pump 25 is communicated with the mixing tank 24 through the connection module 26, and the water inlet end 261 is located on the connection module 26; when the device is used, the second bubble generation device 20 is located at the rear end of the first bubble generation device 10, namely, water flows through the first bubble generation device 10 to form bubble water, then the bubble water enters from the water inlet end 261 and is pressed into the mixing tank 24 by the booster pump 25, and after the bubble water is mixed with the gas in the mixing tank 24, the bubble water is further superposed to generate micro bubble water.

In use, by turning on and off the second bubble generating means, bubble water of different bubble diameters can be generated in the water circuit 30 of the washing machine 1.

EXAMPLE six

In one embodiment, as shown in fig. 1, 2 and 3, the washing machine 1 includes one or more sets of the second bubble generating device 20 and the first bubble generating device 10.

Further, the first bubble generating device 10 is provided at the water inlet valve end 40 and/or the detergent box water inlet end 51 and/or the detergent box 50 of the washing machine 1 and/or at the drain pump 70.

Further, the second air bubble generating device 20 is provided at the water inlet valve end 40 and/or the detergent box water inlet end 51 of the washing machine 1 and/or the lower bellows 60 and/or the drain pump 70 and/or the circulation shower pipe 80.

Specifically, the second bubble generation device 20 and the first bubble generation device 10 can be combined at different positions of the washing machine 1 according to design requirements or actual use requirements, so that the washing machine 1 can have strong cleaning and purifying capabilities in each washing process, and the use experience of a user is favorably improved.

The first bubble generation device 10 and the second bubble generation device 20 may be fixedly installed at the water inlet valve end 40 as a combination to ensure that water passing through the water inlet valve 40 or entering the water inlet valve 40 is bubble water containing micro bubbles, and the bubble water is applied to the whole washing process to improve the washing efficiency of the clothes.

The first bubble generation device 10 and the second bubble generation device 20 may also be communicated with the water channel 30 of the detergent box 50, and specifically, may be installed at the water inlet end 51 of the detergent box, or may be installed inside the detergent box 50, so that the water flow in the detergent box 50 is bubble water containing micro bubbles, and the bubble water enters different chambers of the detergent box 50 to be fully mixed with the detergent solvent, thereby accelerating the full dissolution of the detergent solvent and reducing the waste of the detergent.

The second bubble generating device 20 can be communicated with the circulating spraying pipeline 80, so that the water used circularly is bubble water, the washing efficiency in the rinsing process is improved, and the residual detergent on the clothes is dissolved in an accelerated manner; or fixedly connected to the lower corrugated pipe 60 of the washing machine 1, wherein one end of the lower corrugated pipe 60 is communicated with the outer cylinder of the washing machine 1, and the other end of the lower corrugated pipe 60 is communicated with the circulating spray pipeline 80, so that the water flow entering the circulating spray pipeline 80 is bubble water containing bubbles; it is also possible to install the drain pump 70 at the drain pump 70, and the drain pump 70 is respectively communicated with the lower bellows 60 and the circulation shower duct 80.

While the embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application suitable for this invention, and further modifications may be readily made by those skilled in the art, and the invention is therefore not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.

Claims (10)

1. A multi-stage microbubble washing machine comprising:

the first bubble generating device and the at least one second bubble generating device are arranged in the water path of the washing machine; wherein,

the first bubble generating device comprises a pipe body and a bubbler, the pipe body and the bubbler enclose to form a flow passage, and washing water is decompressed to form bubble water when flowing through the flow passage;

the second bubble generating device is a controlled device and is used for mixing gas into the water channel to generate micro bubbles;

the second bubble generation device is positioned at the rear end of the first bubble generation device;

when the second bubble generating device is controlled to be opened or closed, bubble water with different bubble apertures can be formed through the combined action of the first bubble generating device and the second bubble generating device.

2. The multi-stage microbubble washing machine of claim 1, wherein: the density of the bubbles generated by the first bubble generation device is less than that of the bubbles generated by the second bubble generation device.

3. The multi-stage microbubble washing machine of claim 1, wherein: the water route includes main water route and an at least reposition of redundant personnel water route, second bubble generating device is located main water route, first bubble generating device is located the reposition of redundant personnel water route, and is equipped with first bubble generating device's reposition of redundant personnel water route disposes the solenoid valve.

4. The multi-stage microbubble washing machine of claim 1, wherein: the water inlet of the first bubble generation device is arranged on the tube body, the water outlet of the first bubble generation device is arranged on the bubbler, and the radial sectional area of the flow channel gradually decreases along the direction from the water outlet to the water inlet.

5. The multi-stage microbubble washing machine of claim 4, wherein: the bubbler comprises a base and a cone; the cone is of a hollow structure and extends from the base to the water inlet; the water outlet is arranged on the base.

6. The multi-stage microbubble washing machine of claim 4, wherein: the bubbler comprises a tube body, wherein an impeller is formed on the outer wall of the bubbler, the impeller extends into the tube body, washing water mixed air flows through the bubbler and drives the impeller to drive the bubbler to rotate, and gaps between the impeller and the inner wall of the tube body are changed in the rotating process of the impeller so as to form micro bubbles in the washing water.

7. The multiple stage microbubble washing machine as claimed in claim 1, wherein: the second bubble generating device comprises a gas supply pipeline serving as a gas transportation channel and a bubbled stone communicated with the gas supply pipeline; the gas supply line is connected with the air pump, the gas that the air pump produced passes through the gas supply line carries to the air bubble stone to produce the microbubble in the washing water.

8. The multi-stage microbubble washing machine of claim 1, wherein: the second bubble generating device comprises a mixing tank and a booster pump; wherein,

the mixing tank is communicated with the booster pump, the booster pump presses washing water into the mixing tank, the washing water entering the mixing tank is mixed with gas in the mixing tank to form bubble water, and the bubble water returns to the water path through the water outlet end of the mixing tank.

9. The multi-stage microbubble washing machine of claim 1, wherein: the first bubble generating device is arranged at a water inlet valve end of the washing machine and/or a water inlet end of a detergent box and/or in the detergent box and/or at a drainage pump.

10. The multiple stage microbubble washing machine as claimed in claim 1, wherein: the second air bubble generating device is arranged at the water inlet valve end of the washing machine and/or the water inlet end of the detergent box and/or the lower corrugated pipe and/or the drain pump and/or the circulating spray pipeline.

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