A micro-nano bubble generating device and a cleaning machine using the same

Abstract

The present invention relates to a micro-nano bubble generating device, comprising a shell with a first cavity, a first water inlet for water flow to enter the first cavity is provided on the side wall of the shell, and a hole is provided on the bottom wall of the shell to connect the first cavity with the outside air, and the hole is formed into a tapered hole with a small upper end and a large lower end. Water enters the first cavity and quickly blocks the hole. In the process of continuous input of water flow into the first cavity, the pressure in the first cavity increases sharply, which increases the solubility of air in water. With the turbulence generated by the input of water flow, the air quickly dissolves in the water. When the pressure in the first cavity reaches the critical value that the upper port of the tapered hole can bear, the water flow with a large amount of air dissolved is quickly released from the tapered hole to form micro-nano bubble water. The process of generating micro-nano bubble water according to the present invention does not require power supply and electric control operation, which not only simplifies the equipment structure, but also reduces the cost and improves the reliability of use.

Description

Technical Field

[0001] The invention relates to a micro-nano bubble generating device for washing electrical appliances, and also relates to a washing machine which uses the micro-nano bubble generating device and is used for washing tableware, vegetables or fruits. Background Art

[0002] As micro-nano bubble cleaning technology gradually matures, its application in the field of home appliances has become more extensive.

[0003] In the field of industrial applications, nano-scale bubbles refer to tiny bubbles below 1000nm in liquids. Furthermore, bubbles between 1 and 100μm are called micro bubbles, and bubbles above 100μm are called ordinary bubbles. In water, compared with ordinary bubbles, micro-nano bubbles have the characteristics of long existence time, high surface energy, negative surface charge, high gas-liquid mass transfer rate, and spontaneous generation of free radicals. Therefore, micro-nano bubbles have the functions of oxygenation, sterilization, disinfection, washing, decontamination, water purification, and organic matter degradation. Due to these functions of micro-nano bubbles, they have shown broad market prospects in the fields of washing and health, such as laundry decontamination and descaling, skin cleaning, drinking water oxygenation, vegetable and fruit washing, and tooth descaling.

[0004] At present, there are four main methods for generating micro-nano bubbles: ultrasonic cavitation, hydrodynamic cavitation, optical cavitation and microparticle cavitation. Among them, hydrodynamic cavitation equipment requires simple requirements and is a common method for generating micro-nano bubbles. For example, the Chinese invention patent application "A Micro-nano Ozone Bubble Device" (application number: CN201510199198.5) with application publication number CN104803467A and the Chinese invention patent application "Washing Machine Filter Device Based on Micro-nano Explosion" (application number: CN201810907234.2) with application publication number CN108842384A all disclose similar structures. Most of the above-mentioned existing micro-nano bubble generating devices use air pumps to provide a power source to mix with air. After the air and water are fully mixed and dissolved, the pressure is released to obtain micro-nano bubbles with a high concentration. The implementation structure of this method is relatively complex, costly, and needs to rely on circuits for control, and the reliability is poor. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a micro-nano bubble generating device which can passively generate micro-nano bubbles, thereby simplifying the equipment structure, reducing costs and improving reliability, in view of the current status of the prior art.

[0006] Another technical problem to be solved by the present invention is to provide a cleaning machine using the above-mentioned micro-nano bubble generating device in view of the current status of the prior art, which can effectively improve the cleaning effect and has both overflow and ventilation functions.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a micro-nano bubble generating device, including a shell, the shell having a hollow first cavity, characterized in that: a first water inlet for water to flow into the first cavity is opened on the side wall of the shell, and a hole is opened on the bottom wall of the shell, which passes through from top to bottom to connect the first cavity with the outside air, and the hole is formed into a tapered hole with a small upper end and a large lower end.

[0008] In the above scheme, the upper end of the hole is located on the inner bottom wall of the shell, and the diameter of the upper end is 1-1.5 mm. The upper end of the hole is set to 1-1.5 mm so that after the water flow initially enters the first cavity, the upper end of the hole can be blocked, so that high pressure is formed in the first cavity as the water flows in, and the water entering the first cavity is prevented from flowing away during the water flow transportation process.

[0009] Preferably, the length of the hole in the axial direction is 15-40 mm, and the diameter of the lower port of the hole is 3-8 mm. Such a structure is adopted to improve the formation effect of micro-nano bubbles.

[0010] Preferably, the holes are multiple and arranged at intervals on the bottom wall of the shell, and the first water inlet is also opened on the bottom wall of the shell. The holes are opened on the bottom wall of the shell to block the small holes after the water flows in, so that the first cavity forms a closed cavity; the first water inlet is opened at the bottom of the shell, which is not only conducive to the water flow to quickly block the holes after entering the first cavity, but also can form turbulence in the first cavity during the water flow input process, which is conducive to the rapid dissolution of air in water.

[0011] In the above schemes, the housing is provided with a first air inlet, and the first air inlet is provided with a one-way valve that allows gas to enter the first cavity from the outside when the pressure difference between the inside and outside of the first cavity reaches a set value. The one-way valve is provided so that after one micro-nano bubble water is generated, the first cavity can restore its original pressure to prepare an air source for the next micro-nano bubble water generation.

[0012] Preferably, the first air inlet is opened on the top wall of the shell, the one-way valve is constrained on the shell and the cover is placed outside the first air inlet. The first air inlet and the one-way valve are arranged on the top wall of the shell to avoid interference with the water inlet area.

[0013] Preferably, the one-way valve includes a pressure cover and a sealing gasket, the pressure cover is constrained at the first air inlet of the shell and has a accommodating cavity connected to the first air inlet at the bottom, the sealing gasket is movably arranged in the accommodating cavity up and down, and a second air inlet for connecting the outside air to the accommodating cavity is opened on the top wall of the pressure cover, the sealing gasket moves upward to close the second air inlet, and moves downward to open the second air inlet.

[0014] Preferably, the sealing gasket has a sealing portion and a guide portion whose inner diameters gradually decrease from top to bottom, the upper end surface of the sealing portion is a sealing plane that can be pressed against the lower end of the second air inlet to close it, and the lower end surface of the guide portion can be a supporting plane that rests against the outer edge of the first air inlet, and the supporting plane is provided with a guide groove extending radially for the gas in the accommodating cavity to pass through the first air inlet into the first cavity.

[0015] Preferably, the upper edge of the sealing portion contracts radially to form a truncated table surface from the upper edge of the guide portion. This structure is beneficial to improving the sealing effect of the sealing plane on the second air inlet.

[0016] Preferably, a plug-in column extending downward and insertable into the first air inlet is provided in the middle of the lower end surface of the guide portion, and when the plug-in column is inserted into the first air inlet, there is a gap between the outer wall of the plug-in column and the inner wall of the first air inlet. The plug-in column is formed into a truncated cone structure with a large upper end and a small lower end. This structure is conducive to preventing the sealing gasket from deviating in the accommodating cavity or affecting its normal floating up and down.

[0017] In order to facilitate the adjustment of the set pressure of the one-way valve, the following structure can also be adopted: the accommodating chamber has an air guide channel extending downward along the edge of the second air inlet, and an elastic member is sleeved on the outer periphery of the air guide channel, the upper end of the elastic member abuts against the inner top wall of the accommodating chamber, and the lower end of the elastic member abuts against the upper end surface of the sealing gasket.

[0018] In order to facilitate installation and improve sealing, the top of the shell is partially recessed at the outer edge around the first air inlet to form a receiving groove for installing a pressure cover, and a sealing ring arranged around the outer edge of the first air inlet is provided between the lower end surface of the pressure cover and the bottom wall of the receiving groove.

[0019] A cleaning machine using the above-mentioned micro-nano bubble generating device comprises a box body with a washing chamber, a second water inlet is provided on the side wall of the box body, and is characterized in that it also comprises the above-mentioned micro-nano bubble generating device, a shell of the micro-nano bubble generating device is provided on the side wall of the box body, and the lower port of the hole is connected to the second water inlet of the box body.

[0020] In order to facilitate assembly, the shell has a second cavity that can surround the lower end of the hole, and a third water inlet that can connect the second cavity with the second water inlet of the box body is opened on the side wall of the shell.

[0021] Preferably, the inner bottom wall of the second cavity is gradually inclined upward from the middle to the outside to form a first inclined portion at least near the first side, and an overflow port is provided at the outer end of the first inclined portion. Combining the micro-nano generating device with the overflow structure is conducive to simplifying the overall structure of the cleaning machine, saving costs, and facilitating control and use.

[0022] Preferably, the outer end of the first inclined portion has a horizontal portion extending horizontally outward, the overflow port is opened on the horizontal portion, and a vertically arranged baffle is provided at the junction of the outer end of the first inclined portion and the horizontal portion.

[0023] Preferably, the inner top wall of the second cavity is lifted upward at the end corresponding to the first inclined portion to form a drain area that can drain the residual air in the second cavity in the overflow state, and the outer end of the drain area corresponds to the overflow port up and down, and the inner end of the drain area is at least arranged corresponding to the inner edge of the outer end of the first inclined portion. This structure facilitates the removal of residual air in the flow channel, thereby increasing the pressure difference before and after the overflow end and increasing the overflow flow rate.

[0024] Preferably, the inner bottom wall of the second cavity gradually tilts upward from the middle to the outside near the second side to form a second inclined portion, and the second side of the second cavity has a ventilation channel extending upward from the outer end of the second inclined portion, and the upper part of the shell has a ventilation port connected to the ventilation channel. Since the water tank cleaning machine needs to be heated during the cleaning process, the pressure difference between the front and the back is large, and the above ventilation port can balance the internal and external air pressure. The present invention combines the micro-nano generating device with the overflow structure and the ventilation structure, which is conducive to simplifying the overall structure of the cleaning machine, saving costs, and facilitating control and use.

[0025] Preferably, the first water inlet is connected to a water inlet channel, which is arranged vertically through the second cavity from bottom to top. This structure transports water vertically, which is conducive to enhancing the turbulence effect generated in the first cavity.

[0026] Preferably, the water inlet channel is provided with an eddy current component and a water flow sensor capable of detecting the water inlet amount.

[0027] Compared with the prior art, the advantages of the present invention are as follows: the present invention provides a passive micro-nano bubble generating device, when in use, water flows into the first cavity through the first water inlet, because the upper port of the hole on the bottom wall of the shell is extremely small, therefore, the water entering the first cavity will quickly block the hole due to the action of gravity, in the process of continuous water flow input into the first cavity, the air in the first cavity has nowhere to dissipate, so that the pressure in the first cavity increases sharply, thereby increasing the solubility of air in water, accompanied by the turbulence effect generated by the water flow input, the air quickly dissolves in the water, when the pressure in the first cavity reaches the critical value that the upper port of the tapered hole can bear, the water flow with a large amount of air dissolved is quickly released outward from the tapered hole, and negative pressure is generated in the process of passing through the tapered hole, thereby forming micro-nano bubble water; the process of generating micro-nano bubble water according to the present invention does not need to provide power and perform electronic control operation, which not only simplifies the equipment structure, but also reduces the cost and improves the reliability of use; the cavitation effect generated by the micro-nano bubbles in water and the negative charge on the surface have a chemical effect of improving the interfacial activity, which is conducive to improving the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a micro-nano bubble generating device in Example 1 of the present invention;

[0029] Figure 2 for Figure 1 A cross-sectional view of

[0030] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0031] Figure 4 for Figure 2 A schematic diagram of the enlarged structure of part B;

[0032] Figure 5 for Figure 4 A schematic diagram of the structure of the middle sealing gasket;

[0033] Figure 6 This is a schematic diagram of the assembly structure of the one-way valve and the housing in Example 2 of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the cleaning machine in Example 1 of the present invention. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings.

[0036] Embodiment 1:

[0037] like Figures 1 to 5As shown, the micro-nano bubble generating device of this embodiment includes a housing 1, which has a hollow first cavity 11. A first water inlet 111 for water flow to enter the first cavity 11 is opened on the side wall of the housing 1, and a hole 12 is opened on the bottom wall of the housing 1 to connect the first cavity 11 with the outside air, and the hole 12 is formed into a tapered hole with a small upper end and a large lower end. The upper port of the hole 12 is located on the inner bottom wall of the housing 1, and the diameter of the upper port is 1 to 1.5 mm. The upper port of the hole is set to 1 to 1.5 mm in order to block the upper port of the hole 12 after the water flow initially enters the first cavity 11, so that the first cavity 11 forms a high pressure as the water flow enters, and the water flow entering the first cavity 11 is prevented from flowing away during the water flow transportation process. The length of the hole 12 in the axial direction is 15-40 mm, and the diameter of the lower port of the hole 12 is 3-8 mm. Such a structure is adopted so that the water flow can quickly generate negative pressure in the process of rushing out of the hole 12, so as to improve the formation effect of micro-nano bubbles.

[0038] In this embodiment, there are multiple holes 12 arranged at intervals on the bottom wall of the housing 1, and the first water inlet 111 is also provided on the bottom wall of the housing 1. The holes 12 are provided on the bottom wall of the housing 1 to block the small holes after the water flows in, so that the first cavity 11 forms a closed cavity; the first water inlet 111 is provided at the bottom of the housing 1, which is not only conducive to the water flow to quickly block the holes 12 after entering the first cavity 11, but also to form turbulence in the first cavity 11 during the water flow input process, which is conducive to the rapid dissolution of air in water.

[0039] In this embodiment, a first air inlet 13 is provided on the housing 1, and a one-way valve 2 is provided on the first air inlet 13, which allows gas to enter the first cavity 11 from the outside when the pressure difference between the inside and outside of the first cavity 11 reaches a set value. The one-way valve 2 is provided so that after one micro-nano bubble water is produced, the first cavity 11 can restore the original pressure and prepare an air source for the next micro-nano bubble water production. The first air inlet 13 is provided on the top wall of the housing 1, and the one-way valve 2 is constrained on the housing 1 and the cover is placed outside the first air inlet 13. The first air inlet 13 and the one-way valve 2 are provided on the top wall of the housing 1 to avoid interference with the water inlet area.

[0040] The one-way valve 2 of this embodiment includes a pressure cover 21 and a sealing gasket 22. The pressure cover 21 is constrained at the first air inlet 13 of the shell 1 and has a accommodating chamber 211 connected to the first air inlet 13 at the bottom. The sealing gasket 22 is arranged in the accommodating chamber 211 so as to be movable up and down. A second air inlet 212 for connecting the outside air with the accommodating chamber 211 is opened on the top wall of the pressure cover 21. The sealing gasket 22 moves upward to close the second air inlet 13, and moves downward to open the second air inlet 13. The sealing gasket 22 has a sealing portion 221 and a guide portion 222 whose inner diameter gradually decreases from top to bottom. The upper end surface of the sealing portion 221 is a sealing plane that can be pressed against the lower end of the second air inlet 212 to close it. The lower end surface of the guide portion 222 can be a supporting plane that abuts against the outer edge of the first air inlet 13, and the supporting plane is provided with a guide groove 2221 extending radially so as to allow the gas in the accommodating cavity 211 to pass through the first air inlet 13 and enter the first cavity 11. The upper edge of the sealing portion 221 contracts radially to form a truncated table surface 2211 at the upper edge of the guide portion, and this structure is conducive to improving the sealing effect of the sealing plane on the second air inlet 212. A plug-in column 223 extending downward and capable of being inserted into the first air inlet 13 is provided in the middle of the lower end surface of the guide portion 222, and when the plug-in column 223 is inserted into the first air inlet 13, there is a gap between the outer wall of the plug-in column 223 and the inner wall of the first air inlet 13. The plug-in column 223 is formed into a truncated cone structure with a large upper end and a small lower end. This structure is beneficial to preventing the sealing gasket 22 from deviating in the accommodating cavity 211 or affecting its normal floating up and down.

[0041] In order to facilitate installation and improve sealing, the top of the shell 1 is partially recessed at the outer edge around the first air inlet 13 to form a receiving groove 14 for installing the pressure cover 21. The pressure cover 21 is fixed in the receiving groove 14 by screws, and a sealing ring 23 arranged around the outer edge of the first air inlet 13 is provided between the lower end surface of the pressure cover 21 and the bottom wall of the receiving groove 14.

[0042] like Figure 7 As shown, the cleaning machine of this embodiment includes a box body 3 and an upper micro-nano bubble generating device. The box body 3 is hollow inside to form a washing chamber. A second water inlet 31 is provided on the side wall of the box body 3. The housing 1 of the micro-nano bubble generating device is provided on the outer side wall of the box body 3, and the lower end of the hole 12 is connected to the second water inlet 31 of the box body 3. For ease of assembly, the housing 1 has a second cavity 15 that can surround the lower end of the hole 12, and a third water inlet 17 that can connect the second cavity 15 with the second water inlet 31 of the box body 3 is provided on the side wall of the housing 1.

[0043] In this embodiment, the inner bottom wall of the second cavity 15 gradually tilts upward from the middle to the outside near the first side to form a first inclined portion 151, and an overflow port 16 is provided at the outer end of the first inclined portion 151. The outer end of the first inclined portion 151 has a horizontal portion 152 extending horizontally outward, and the overflow port 16 is provided on the horizontal portion 152, and a vertically arranged baffle 153 is provided at the junction of the outer end of the first inclined portion 151 and the horizontal portion 152, and the upper edge of the baffle 153 is not higher than the inner bottom wall edge of the first cavity 11. The inner top wall of the second cavity 15 is lifted upward at the end corresponding to the first inclined portion 151 to form an emptying area 150 that can empty the residual air in the second cavity 15 in the overflow state, and the outer end of the emptying area 150 corresponds to the overflow port 16 up and down, and the inner end of the emptying area 150 is arranged corresponding to the middle of the first inclined portion 151. This structure facilitates the removal of residual air in the flow channel, thereby increasing the pressure difference before and after the overflow end and increasing the overflow flow rate. The inner bottom wall of the second cavity 15 gradually tilts upward from the middle to the outside near the second side to form a second inclined portion 154, and the second side of the second cavity 15 has a ventilation channel 155 extending upward from the outer end of the second inclined portion 154, and the upper part of the shell 1 is provided with a ventilation port 18 connected to the ventilation channel 155. Since the water tank cleaning machine needs to be heated during the cleaning process, the pressure difference before and after is large, and the above-mentioned ventilation port 18 is provided to balance the internal and external air pressure. This embodiment combines the micro-nano generating device with the overflow structure and the ventilation structure, which is conducive to simplifying the overall structure of the cleaning machine, saving costs, and facilitating control and use.

[0044] The first water inlet 111 is connected to a water inlet channel 19, which is arranged vertically from bottom to top through the second cavity 15. This structure transports the water flow vertically, which is conducive to enhancing the turbulence effect generated in the first cavity 11. The water inlet channel 19 is provided with an eddy current component and a water flow sensor that can detect the amount of water inflow.

[0045] When the micro-nano bubble generating device of the present embodiment is used, water flows into the first cavity 11 through the first water inlet 111. Since the upper end of the hole 12 on the bottom wall of the shell 1 is extremely small, the water entering the first cavity 11 will quickly block the hole 12 due to gravity. In the process of continuous input of water into the first cavity 11, the air in the first cavity 11 has nowhere to dissipate, so that the pressure in the first cavity 11 increases sharply, thereby increasing the solubility of air in water. With the turbulence generated by the water input, the air quickly dissolves in the water. When the pressure in the first cavity 11 reaches the critical value that the upper end of the tapered hole 12 can bear, the water flow containing a large amount of air is quickly released outward from the tapered hole 12, and negative pressure is generated in the process of passing through the tapered hole 12. , thereby forming micro-nano bubble water; since the air in the first cavity 11 is dissolved in the water and discharged with the water, as the liquid level in the first cavity 11 decreases, a pressure difference is generated between the first cavity 11 and the outside world. When the critical value set by the one-way valve 2 is reached, the sealing gasket 22 moves downward until the lower end surface of the guide portion 222 on the sealing gasket 22 abuts against the first air inlet 13, and the second air inlet 212 is opened. At this time, air enters the first cavity 11 through the second air inlet 212, the accommodating cavity 211, the guide groove 2221, and the first air inlet 13 to replenish the air source for the first cavity 11; when water is introduced into the first cavity 11 again, as the pressure in the first cavity 11 increases, the sealing gasket 22 floats up and closes the second air inlet 212.

[0046] The process of generating micro-nano bubble water in this embodiment does not require power supply and electronic control operation, which not only simplifies the equipment structure, but also reduces costs and improves reliability of use; the cavitation effect generated by the micro-nano bubbles in the water and the negative charges on the surface have a chemical effect of increasing interfacial activity, which is beneficial to improving the cleaning effect.

[0047] Embodiment 2:

[0048] The difference between this embodiment and embodiment 1 is that: Figure 6 As shown, the structure of the one-way valve 2 is different. In order to facilitate the adjustment of the set pressure of the one-way valve 2, the accommodating chamber 211 of this embodiment has an air guide channel 213 extending downward along the edge of the second air inlet 212, and an elastic member 24 is sleeved on the outer periphery of the air guide channel 213. The elastic member 24 is a spring, and the upper end of the elastic member 24 abuts against the inner top wall of the accommodating chamber 211, and the lower end of the elastic member 24 abuts against the upper end surface of the sealing gasket 22.

Claims

1. A micro-nano bubble generating device, comprising a housing (1), wherein the housing (1) has a hollow first cavity (11), characterized in that: A first water inlet (111) is provided on the side wall of the shell (1) for water to flow into the first cavity (11); a hole (12) is provided on the bottom wall of the shell (1) for penetrating from top to bottom so as to connect the first cavity (11) with the outside air; and the hole (12) is formed into a tapered hole with a small upper end and a large lower end; The upper end of the hole (12) is located on the inner bottom wall of the shell (1), and the diameter of the upper end is 1 to 1.5 mm; the holes (12) are multiple and are arranged at intervals on the bottom wall of the shell (1), and the first water inlet (111) is also opened on the bottom wall of the shell (1).

2. The micro-nano bubble generating device according to claim 1, characterized in that: The length of the hole (12) in the axial direction is 15 to 40 mm, and the diameter of the lower end of the hole is 3 to 8 mm.

3. The micro-nano bubble generating device according to claim 1 or 2, characterized in that: The shell (1) is provided with a first air inlet (13), and the first air inlet (13) is provided with a one-way valve (2) capable of allowing gas to enter the first cavity (11) from the outside when the pressure difference between the inside and outside of the first cavity (11) reaches a set value.

4. The micro-nano bubble generating device according to claim 3, characterized in that: The first air inlet (13) is opened on the top wall of the shell (1), the one-way valve (2) is constrained on the shell (1) and the cover is placed outside the first air inlet (13).

5. The micro-nano bubble generating device according to claim 3, characterized in that: The one-way valve (2) comprises a pressure cover (21) and a sealing gasket (22); the pressure cover (21) is constrained at the first air inlet (13) of the shell (1) and has a receiving chamber (211) at the bottom thereof which is connected to the first air inlet (13); the sealing gasket (22) is arranged in the receiving chamber (211) so as to be movable up and down; a second air inlet (212) for connecting external air to the receiving chamber (211) is provided on the top wall of the pressure cover (21); the sealing gasket (22) moves upward to close the second air inlet (212); and moves downward to open the second air inlet (212).

6. The micro-nano bubble generating device according to claim 5, characterized in that: The sealing gasket (22) comprises a sealing portion (221) and a guiding portion (222) whose inner diameter gradually decreases from top to bottom. The upper end surface of the sealing portion (221) is a sealing plane that can be pressed against the lower end of the second air inlet (212) to seal it. The lower end surface of the guiding portion (222) can be a supporting plane that abuts against the outer edge of the first air inlet (13). The supporting plane is provided with a guiding groove (2221) extending radially so as to allow the gas in the accommodating cavity (211) to pass through the first air inlet (13) and enter the first cavity (11).

7. The micro-nano bubble generating device according to claim 6, characterized in that: The upper edge of the sealing portion (221) contracts radially to form a frustum (2211) from the upper edge of the guide portion (222).

8. The micro-nano bubble generating device according to claim 6, characterized in that: A plug-in column (223) extending downward and capable of being inserted into the first air inlet (13) is provided in the middle of the lower end surface of the guide portion (222), and when the plug-in column (223) is inserted into the first air inlet (13), a gap exists between the outer wall of the plug-in column (223) and the inner wall of the first air inlet (13).

9. The micro-nano bubble generating device according to claim 8, characterized in that: The plug-in column (223) is formed into a truncated cone-shaped structure with a large upper end and a small lower end.

10. The micro-nano bubble generating device according to claim 5, characterized in that: The accommodating cavity (211) has an air guide channel (213) extending downward along the edge of the second air inlet (212), and an elastic member (24) is sleeved on the outer periphery of the air guide channel (213), the upper end of the elastic member (24) abuts against the inner top wall of the accommodating cavity (211), and the lower end of the elastic member (24) abuts against the upper end surface of the sealing pad (22).

11. The micro-nano bubble generating device according to claim 5, characterized in that: The top of the shell (1) is partially recessed at the outer edge around the first air inlet (13) to form a receiving groove (14) for installing a pressure cover (21), and a sealing ring (23) arranged around the outer edge of the first air inlet (13) is provided between the lower end surface of the pressure cover (21) and the bottom wall of the receiving groove (14).

12. A cleaning machine using the micro-nano bubble generating device according to any one of claims 1 to 11, comprising a box (3) having a washing chamber, a second water inlet (31) being provided on a side wall of the box (3), characterized in that: It also comprises the micro-nano bubble generating device, wherein the housing (1) of the micro-nano bubble generating device is arranged on the side wall of the box body (3), and the lower end of the hole (12) is connected to the second water inlet (31) of the box body (3).

13. The cleaning machine according to claim 12, characterized in that: The shell (1) has a second cavity (15) capable of surrounding the lower end of the hole (12), and a third water inlet (17) capable of connecting the second cavity (15) with a second water inlet (31) of the box body (3) is provided on the side wall of the shell (1).

14. The cleaning machine according to claim 13, characterized in that: The inner bottom wall of the second cavity (15) is gradually inclined upward from the middle to the outside at least near the first side to form a first inclined portion (151), and an overflow port (16) is provided at the outer end of the first inclined portion (151).

15. The cleaning machine according to claim 14, characterized in that: The outer end of the first inclined portion (151) has a horizontal portion (152) extending horizontally outward, the overflow port (16) is opened on the horizontal portion (152), and a vertically arranged baffle (153) is provided at the junction between the outer end of the first inclined portion (151) and the horizontal portion (152).

16. The cleaning machine according to claim 14, characterized in that: The inner top wall of the second cavity (15) is lifted upward at the end corresponding to the first inclined portion (151) to form a drain area (150) capable of draining residual air in the second cavity (15) in a water overflow state, and the outer end of the drain area (150) corresponds to the overflow port (16) in the upper and lower parts, and the inner end of the drain area (150) is arranged at least corresponding to the inner edge of the outer end of the first inclined portion (151).

17. The cleaning machine according to claim 13, characterized in that: The inner bottom wall of the second cavity (15) gradually tilts upward from the middle outward near the second side to form a second inclined portion (154), and the second side of the second cavity (15) has a ventilation channel (155) extending upward from the outer end of the second inclined portion (154), and the upper part of the shell (1) is provided with a ventilation port (18) connected to the ventilation channel (155).

18. The cleaning machine according to any one of claims 12 to 17, characterized in that: The first water inlet (111) is connected to a water inlet channel (19), and the water inlet channel (19) is arranged vertically from bottom to top through the second cavity (15).

19. The cleaning machine according to claim 18, characterized in that: The water inlet channel (19) is provided with an eddy current component and a water flow sensor capable of detecting the amount of water inlet.

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