Micro-nano bubble generator based on double venturi effect

Abstract

This invention relates to the field of fluid machinery technology, and in particular to a micro / nano bubble generator based on the double Venturi effect. The generator includes a mounting base with a magnetic suction assembly rotatably connected to its inner wall. Pushers are slidably fitted on both sides of the mounting base in a cross-symmetrical structure. A prying assembly is slidably contacted on one side of each pusher. A nozzle mounting assembly is mounted on the mounting base, and a double Venturi cavitation assembly is mounted on the nozzle mounting assembly. A plug-in seat is fixedly connected to the mounting base, and a spiral guide plate is movably plugged into the plug-in seat. By incorporating the magnetic suction assembly within the mounting base, when the double Venturi cavitation assembly is installed inside the reaction vessel, a matching, flush mounting base and magnetic suction assembly are designed for the original flat, rigid base surface of the tower's inner wall. This eliminates the need for opening holes or slots, fully preserving the standard structure of the catalytic oxidation reaction tower without additional modifications. This avoids safety hazards such as leakage, corrosion, and pressure drop caused by opening modifications. Furthermore, the magnetic suction assembly and disassembly operation is convenient and facilitates nozzle inspection and maintenance.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and in particular to a micro / nano bubble generator based on the double Venturi effect. Background Technology

[0002] Microbubbles, typically referring to tiny bubbles with a diameter of less than 50 micrometers, have shown great application potential in wastewater treatment, environmental remediation, agricultural irrigation, aquaculture, medical and health care, and industrial cleaning due to their unique physicochemical properties such as large specific surface area, long residence time in water, high interfacial potential, and high mass transfer efficiency.

[0003] When existing micro-nano bubble generators are installed in reaction vessels, the traditional fixing method requires drilling holes and slots in the vessel wall. This not only damages the original intact pressure-bearing and corrosion-resistant structure of the vessel, but also creates safety hazards such as leakage, corrosion, and pressure reduction. The modification construction process is complicated and costly. After modification, the vessel cannot be restored to the original standard structure, resulting in poor versatility and difficulty in adapting to the retrofitting of existing reaction vessels.

[0004] In summary, the existing technology lacks a wall-mounting technology for adapting micro / nano bubble generators to the inner wall of reaction vessels. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by proposing a micro / nano bubble generator based on the double Venturi effect.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a micro / nano bubble generator based on the double Venturi effect, comprising a mounting base, a magnetic suction assembly rotatably connected to the inner wall of the mounting base, pushers slidably fitted on both sides of the mounting base in a cross-symmetrical structure, a prying assembly slidably contacting one side of the pushers, a nozzle mounting assembly mounted on the mounting base, a double Venturi cavitation assembly mounted on the nozzle mounting assembly, a plug-in seat fixedly connected to the mounting base, a spiral guide plate movably plugged into the plug-in seat, the magnetic suction assembly comprising a rotating shaft rotatably connected to the inner wall of the mounting base, rotating seats fixedly connected to both ends of the rotating shaft, the outer wall of the rotating seats rotatably connected to the inner wall of the mounting base, and a strong magnet fixedly connected to one side of the rotating seats.

[0007] Preferably, one side of the mounting base has an arc-shaped structure that matches the regular arc-shaped inner wall of the lower part of the reaction tower. The arc-shaped structure of the mounting base has two symmetrical storage slots on one side, and the inner wall of the storage slots matches the outer wall of the rotating seat. The other side of the mounting base has two storage slots in an intersecting structure, and the inner wall of one side of the storage slots has a limiting hole.

[0008] Preferably, a worm gear is fixedly connected to the middle of the rotating shaft, and a worm is engaged with one side of the worm gear for transmission, with one end of the worm being rotatably connected to the inner wall of the mounting base.

[0009] Preferably, one end of the push frame is U-shaped, a spring is fixedly connected to the middle of the push frame, the other end of the spring is slidably engaged with the inner wall of the mounting base, and a contact end is fixedly connected to the other end of the push frame.

[0010] Preferably, the prying assembly includes a pry bar, one end of which near the contact end is fixedly connected to a pin, both ends of which are rotatably connected to the second storage groove. One end of the pry bar is slidably contacted with the contact end, and the other end of the pry bar has a sleeve hole on its inner wall. A slider is slidably fitted on the inner wall of the sleeve hole. A second spring is fixedly connected between one side of the slider and the inner wall of the sleeve hole. An extension handle is fixedly connected to the side of the slider connected to the second spring. The other end of the extension handle extends through the inner wall of the sleeve hole to the outside and is movably inserted into the limiting hole.

[0011] Preferably, the nozzle mounting assembly includes a fixed base, the bottom end of which is fixedly connected to a mounting base. An adjusting frame is rotatably connected to the fixed base. An electric actuator is rotatably connected between the bottom end of the adjusting frame and the fixed base. A fixed sleeve is fixedly connected to one end of the adjusting frame. An electric actuator is fixedly connected to the inner wall of the other end of the adjusting frame. A movable sleeve is fixedly connected to the output end of the electric actuator.

[0012] Preferably, the dual Venturi cavitation assembly includes a nozzle, and the inner wall of the nozzle is provided with a first Venturi tube and a second Venturi tube connected in series. The outlet end of the first Venturi tube is sealed and connected to the inlet end of the second Venturi tube, and the outlet end of the second Venturi tube is sealed and connected to the liquid outlet pipe. The throat section structural parameters of the first Venturi tube and the second Venturi tube are different.

[0013] Preferably, the top of the connector has a connector hole, and a U-shaped plug rod is slidably fitted through the inner wall of one side of the connector hole. Springs are fixedly connected to the outer walls of both ends of the U-shaped plug rod located on the inner wall of the connector.

[0014] Preferably, the spiral guide plate has multiple diverter plates fixedly connected in a spiral structure, and the bottom end of the spiral guide plate is fixedly connected to an opening rod, the outer wall of the bottom end of the opening rod being movably inserted into the insertion hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. By setting up a magnetic suction component in the mounting base, a strong magnet can be used to achieve a matching mounting base and magnetic suction component designed for the original flat and rigid base surface of the inner wall of the tower when the double Venturi cavitation component is installed in the reaction vessel. No holes or grooves are required, and the standard structure of the catalytic oxidation reaction tower is completely preserved without additional modifications. This avoids the safety hazards such as leakage, corrosion and pressure drop caused by hole modification. At the same time, the magnetic suction is convenient to install and remove, and facilitates nozzle inspection and maintenance.

[0017] 2. By setting up a prying component and a pusher, the strong magnet can be removed more quickly when the mounting base is removed, thanks to the lever principle, thus improving the efficiency of maintenance and disassembly. At the same time, by setting up a nozzle mounting component on the mounting base, it is convenient to quickly install the double Venturi cavitation component, effectively improving the overall flexibility of the equipment.

[0018] 3. By setting a spiral guide plate on the plug-in seat on the mounting base, the bubbles ejected by the dual Venturi cavitation component can be guided to rise spirally along the wall. At the same time, in conjunction with the flow divider, the bubbles can be partially diffused into the tank during the spiral ascent, resulting in a more comprehensive distribution of bubbles. Attached Figure Description

[0019] Figure 1 This is a cross-sectional schematic diagram of the structure of a dual Venturi cavitation component for a micro / nano bubble generator based on the dual Venturi effect according to the present invention.

[0020] Figure 2 This is a schematic diagram of the overall structure of the micro / nano bubble generator based on the double Venturi effect of the present invention when applied in a reaction vessel;

[0021] Figure 3 This is a schematic diagram of the overall structure of a micro / nano bubble generator based on the double Venturi effect according to the present invention.

[0022] Figure 4 This is a partial cross-sectional schematic diagram of the mounting base structure for a micro / nano bubble generator based on the double Venturi effect according to the present invention.

[0023] Figure 5 This is a schematic diagram of the magnetic suction component structure of a micro / nano bubble generator based on the double Venturi effect according to the present invention.

[0024] Figure 6 This is a schematic diagram of the pusher structure of a micro / nano bubble generator based on the double Venturi effect according to the present invention;

[0025] Figure 7 This is a partial cross-sectional schematic diagram of the structure of the lever assembly of a micro / nano bubble generator based on the double Venturi effect according to the present invention.

[0026] Figure 8This is a schematic diagram of the nozzle mounting assembly structure of a micro / nano bubble generator based on the double Venturi effect according to the present invention.

[0027] Figure 9 This is a partial cross-sectional schematic diagram of the connector structure of a micro / nano bubble generator based on the double Venturi effect according to the present invention.

[0028] Figure 10 This is a schematic diagram of the spiral guide plate structure of a micro / nano bubble generator based on the double Venturi effect according to the present invention.

[0029] The following components are marked in the diagram: 1. Mounting base; 2. Magnetic suction assembly; 3. Push frame; 4. Prying assembly; 5. Nozzle mounting assembly; 6. Double Venturi cavitation assembly; 7. Plug-in socket; 8. Spiral guide plate; 101. Storage slot one; 102. Storage slot two; 103. Limiting hole; 201. Rotating shaft; 202. Rotating seat; 203. Strong magnet; 204. Worm gear; 205. Worm; 301. Spring one; 302. Contact end; 401. Pry bar; 402. Sleeve hole; 403. Slider; 404. Spring 2; 405. Extended grip; 501. Fixed base; 502. Adjusting bracket; 503. Electric actuator 1; 504. Fixed sleeve; 505. Electric actuator 2; 506. Movable sleeve; 601. Nozzle; 602. First Venturi tube; 603. Second Venturi tube; 701. Insertion hole; 702. U-shaped insert rod; 703. Spring 3; 801. Diverter plate; 802. Opening rod. Detailed Implementation

[0030] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0031] like Figures 1-10 The micro / nano bubble generator based on the double Venturi effect shown includes a mounting base 1, a magnetic suction component 2 rotatably connected to the inner wall of the mounting base 1, pushers 3 slidably fitted on both sides of the mounting base 1 in a cross-symmetrical structure, a prying component 4 slidably contacting one side of the pushers 3, a nozzle mounting component 5 mounted on the mounting base 1, a double Venturi cavitation component 6 mounted on the nozzle mounting component 5, a plug-in seat 7 fixedly connected to the mounting base 1, a spiral guide plate 8 movably plugged into the plug-in seat 7, and a rotating shaft 201 rotatably connected to the inner wall of the mounting base 1. Rotating seats 202 are fixedly connected to both ends of the rotating shaft 201, the outer wall of the rotating seats 202 is rotatably connected to the inner wall of the mounting base 1, and a strong magnet 203 is fixedly connected to one side of the rotating seats 202.

[0032] The rotating base 202 allows the strong magnet 203 to be stored inside the mounting base 1 before use.

[0033] By setting a magnetic suction component 2 inside the mounting base 1, and using a strong magnet 203, when the double Venturi cavitation component 6 is installed inside the reaction vessel, a matching mounting base 1 and magnetic suction component 2 are designed for the original flat and rigid base surface of the inner wall of the tower. There is no need to open holes or grooves, and the standard structure of the catalytic oxidation reaction tower is completely preserved without additional modifications. This avoids the safety hazards such as leakage, corrosion and pressure drop caused by opening holes and modifications. At the same time, the magnetic suction is convenient for disassembly and assembly, and facilitates nozzle inspection and maintenance.

[0034] like Figure 4 As shown, one side of the mounting base 1 has an arc-shaped structure that matches the regular arc-shaped inner wall of the lower part of the reaction tower. The arc-shaped structure of the mounting base 1 has two symmetrical storage slots 101. The inner wall of the storage slot 101 matches the outer wall of the rotating seat 202. The other side of the mounting base 1 has two storage slots 102 with an upper and lower cross structure. The inner wall of one side of the storage slot 102 has a limit hole 103.

[0035] Mounting base 1's arc-shaped surface perfectly fits the inner arc of the reaction tower, ensuring uniform magnetic force and seamless fit, thus improving the stability of magnetic fixation. Storage slot 101 provides storage space for magnetic components 2, allowing the strong magnet 203 to be completely hidden when the equipment is idle or during transportation, preventing the magnet from being bumped or attracting impurities. Cross-distributed storage slot 202 provides installation and rotation space for the two sets of prying components 4, and the limiting hole 103 is used to insert and fix the extension handle 405.

[0036] like Figure 5 As shown, a worm gear 204 is fixedly connected to the middle of the rotating shaft 201, and a worm 205 is meshed and driven on one side of the worm gear 204. One end of the worm 205 is rotatably connected to the inner wall of the mounting base 1.

[0037] like Figure 6 As shown, one end of the push frame 3 is U-shaped, and a spring 301 is fixedly connected to the middle of the push frame 3. The other end of the spring 301 is slidably fitted with the inner wall of the mounting base 1, and a contact end 302 is fixedly connected to the other end of the push frame 3.

[0038] Spring 301 drives the pusher 3 to be retracted into the mounting base 1.

[0039] like Figure 6As shown, the prying assembly 4 includes a pry bar 401. A pin is fixedly connected to one end of the pry bar 401 near the contact end 302. Both ends of the pin are rotatably connected to the storage groove 102. One end of the pry bar 401 is slidably in contact with the contact end 302. A sleeve hole 402 is opened on the inner wall of the other end of the pry bar 401. A slider 403 is slidably fitted on the inner wall of the sleeve hole 402. A spring 404 is fixedly connected between one side of the slider 403 and the inner wall of the sleeve hole 402. An extension handle 405 is fixedly connected to the side of the slider 403 connected to the spring 404. The other end of the extension handle 405 extends through the inner wall of the sleeve hole 402 to the outside and is movably inserted into the limiting hole 103.

[0040] Spring 404 drives the extension grip 405 out of the pry bar 401, and the limiting hole 103 limits the extension grip 405 to ensure stable storage.

[0041] like Figure 7 As shown, the nozzle mounting assembly 5 includes a fixed base 501, the bottom end of which is fixedly connected to the mounting base 1. An adjusting frame 502 is rotatably connected to the fixed base 501. An electric actuator 503 is rotatably connected between the bottom end of the adjusting frame 502 and the fixed base 501. A fixed sleeve 504 is fixedly connected to one end of the adjusting frame 502. An electric actuator 505 is fixedly connected to the inner wall of the other end of the adjusting frame 502. A movable sleeve 506 is fixedly connected to the output end of the electric actuator 505.

[0042] The fixed sleeve 504 and the movable sleeve 506 are adapted to both ends of the nozzle 601, and the electric actuator 505 enables the adjustment of the angle of the double Venturi cavitation assembly 6 on the adjustment frame 502.

[0043] like Figure 1 As shown, the dual Venturi cavitation assembly 6 includes a nozzle 601. The inner wall of the nozzle 601 is provided with a first Venturi tube 602 and a second Venturi tube 603 connected in series. The outlet end of the first Venturi tube 602 is sealed and connected to the inlet end of the second Venturi tube 603. The outlet end of the second Venturi tube 603 is sealed and connected to the liquid outlet pipe. The throat section structural parameters of the first Venturi tube 602 and the second Venturi tube 603 are different.

[0044] The dual Venturi cavitation component 6, which uses two Venturi tubes connected in series, utilizes the dual negative pressure and high-speed jet formed by the two Venturi effects to cavitate and break up the gas-liquid mixture twice. Under certain working conditions, the diameter of the outlet bubbles is mostly distributed between 0.1-12.8μm, which is far superior to the breaking effect of a single Venturi tube. Moreover, the number of bubbles is large and the distribution is uniform, which meets the application requirements of high-precision micro-nano bubbles within 50μm.

[0045] like Figure 9As shown, the top of the plug-in base 7 has a plug-in hole 701, and a U-shaped plug rod 702 is slidably fitted through the inner wall of one side of the plug-in hole 701. Both ends of the U-shaped plug rod 702 are fixedly connected to the outer walls of the inner walls of the plug-in base 7 with springs 703.

[0046] The insertion hole 701 is used to insert and fix the bottom opening rod 802 of the spiral guide plate 8; under normal conditions, the spring 703 pushes the U-shaped insertion rod 702 inward to engage and insert into the hole of the opening rod 802, so as to realize the boltless quick locking and fixing of the spiral guide plate 8.

[0047] like Figure 10 As shown, multiple diverter plates 801 are fixedly connected to the spiral guide plate 8 in a spiral structure. An opening rod 802 is fixedly connected to the bottom end of the spiral guide plate 8. The outer wall of the bottom end of the opening rod 802 is movably inserted into the insertion hole 701.

[0048] The multi-layered staggered flow divider 801 gradually changes the direction of bubble flow, allowing the bubbles floating on the wall to continuously diffuse towards the center of the tank, eliminating aeration dead zones.

[0049] Working principle: During installation, first, the arc-shaped surface of the mounting base 1 is placed against the arc-shaped base surface of the inner wall of the reaction tower. The worm gear 205 is rotated, which drives the worm wheel 204 to rotate. This drives the rotating shaft 201 to rotate the rotating seats 202 at both ends, causing the strong magnet 203 to rotate out of the receiving slot 101. The strong magnet 203 is then placed against the inner wall of the steel tank, and the entire machine is fixed by magnetic force without holes.

[0050] Then, one end of the nozzle 601 is fitted into the fixed sleeve 504, and the movable sleeve 506 is moved by the electric push rod 505 to fit the other end of the nozzle 601 for installation and fixation. Then, the spiral guide plate 8 is inserted and fixed onto the plug seat 7 through the perforated rod 802. The spring 703 will drive the U-shaped plug rod 702 to be inserted into the perforated rod 802 for limiting and fixing.

[0051] Then, based on the water depth of the reaction tower and the aeration process requirements, the electric actuator 503 is activated to extend and retract, driving the adjustment frame 502 to pitch and rotate as a whole, adjusting the injection direction of the double Venturi cavitation component 6.

[0052] High-pressure fluid enters the nozzle 601 and flows sequentially through the first Venturi tube 602 and the second Venturi tube 603, which are connected in series and have different throat parameters. As the fluid passes through the throat, the flow velocity increases sharply and the pressure drops sharply, creating a strong negative pressure cavitation effect that entrains air from the water, forming a gas-liquid mixture. After the first Venturi primary crushing, a second-stage Venturi structure completes secondary fine cavitation crushing, progressively refining the bubble size, ultimately generating high-quality micro-nano bubbles of 0.1-12.8 μm, which are ejected from the nozzle 601 outlet. The ejected micro-nano bubbles contact the spiral guide plate 8 upwards and move spirally upwards along the spiral plate, extending the hydraulic residence time of the bubbles. Simultaneously, the multi-layer diversion plate 801 continuously diverts and guides the flow, allowing the bubbles that were originally concentrated on the tank wall to diffuse towards the center of the reaction tower, achieving uniform bubble distribution throughout the tank, completely eliminating aeration dead zones, and significantly improving the gas-liquid oxidation treatment effect of the water.

[0053] When the equipment needs to be inspected and disassembled, first push the extension handle 405 to disengage it from the limiting hole 103. Then rotate the extension handle 405 and the pry bar 401 out. The second spring 404 will drive the extension handle 405 out of the pry bar 401. Then rotate the extension handle 405. The pry bar 401 will rotate around the pin as a lever, squeezing the contact end 302 and pushing the pusher 3 to slide outward against the elastic force of the first spring 301. The pusher 3 will press against the tank wall and generate a reverse thrust to counteract the magnetic attraction of the strong magnet 203, easily separating the magnetic structure. Finally, rotate the worm gear 205 to retract the strong magnet 203, and it can be removed, completing the disassembly.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A micro / nano bubble generator based on the double Venturi effect, comprising a mounting base (1), characterized in that: The inner wall of the mounting base (1) is rotatably connected to a magnetic suction assembly (2). The two sides of the mounting base (1) are slidably fitted with pushers (3). One side of the pushers (3) is slidably contacted with a prying assembly (4). The mounting base (1) is provided with a nozzle mounting assembly (5). The nozzle mounting assembly (5) is equipped with a double Venturi cavitation assembly (6). The mounting base (1) is fixedly connected with a plug seat (7). The plug seat (7) is movably plugged into a spiral guide plate (8). The magnetic suction assembly (2) includes a rotating shaft (201). The rotating shaft (201) is rotatably connected to the inner wall of the mounting base (1). Both ends of the rotating shaft (201) are fixedly connected with rotating seats (202). The outer wall of the rotating seat (202) is rotatably connected to the inner wall of the mounting base (1). One side of the rotating seat (202) is fixedly connected with a strong magnet (203).

2. The micro / nano bubble generator based on the double Venturi effect according to claim 1, characterized in that: The mounting base (1) has an arc-shaped structure on one side that is adapted to the regular arc-shaped inner wall of the lower part of the reaction tower. The mounting base (1) has two storage slots (101) on one side of the arc-shaped structure. The inner wall of the storage slot (101) is adapted to the outer wall of the rotating seat (202). The mounting base (1) has two storage slots (102) on the other side of the mounting base (1) with an upper and lower cross structure. The inner wall of one side of the storage slot (102) has a limiting hole (103).

3. A micro / nano bubble generator based on the double Venturi effect according to claim 1, characterized in that: A worm gear (204) is fixedly connected to the middle of the rotating shaft (201). A worm (205) is meshed and driven on one side of the worm gear (204). One end of the worm (205) is rotatably connected to the inner wall of the mounting base (1).

4. A micro / nano bubble generator based on the double Venturi effect according to claim 1, characterized in that: One end of the push frame (3) is U-shaped, and a spring (301) is fixedly connected to the middle of the push frame (3). The other end of the spring (301) is slidably connected to the inner wall of the mounting base (1), and a contact end (302) is fixedly connected to the other end of the push frame (3).

5. A micro / nano bubble generator based on the double Venturi effect according to claim 1, characterized in that: The prying assembly (4) includes a pry bar (401). A pin is fixedly connected to one end of the pry bar (401) near the contact end (302). Both ends of the pin are rotatably connected to the storage groove (102). One end of the pry bar (401) is slidably contacted with the contact end (302). A sleeve hole (402) is opened on the inner wall of the other end of the pry bar (401). A slider (403) is slidably fitted on the inner wall of the sleeve hole (402). A spring (404) is fixedly connected between one side of the slider (403) and the inner wall of the sleeve hole (402). An extension handle (405) is fixedly connected to the side of the slider (403) connected to the spring (404). The other end of the extension handle (405) extends through the inner wall of the sleeve hole (402) to the outside and is movably inserted into the limiting hole (103).

6. A micro / nano bubble generator based on the double Venturi effect according to claim 1, characterized in that: The nozzle mounting assembly (5) includes a fixed base (501), the bottom end of which is fixedly connected to the mounting base (1). An adjusting frame (502) is rotatably connected to the fixed base (501). An electric actuator (503) is rotatably connected between the bottom end of the adjusting frame (502) and the fixed base (501). A fixed sleeve (504) is fixedly connected to one end of the adjusting frame (502). An electric actuator (505) is fixedly connected to the inner wall of the other end of the adjusting frame (502). A movable sleeve (506) is fixedly connected to the output end of the electric actuator (505).

7. A micro / nano bubble generator based on the double Venturi effect according to claim 1, characterized in that: The dual Venturi cavitation assembly (6) includes a nozzle (601), and the inner wall of the nozzle (601) is provided with a first Venturi tube (602) and a second Venturi tube (603) connected in series. The outlet end of the first Venturi tube (602) is sealed and connected to the inlet end of the second Venturi tube (603), and the outlet end of the second Venturi tube (603) is sealed and connected to the liquid outlet pipe. The throat section structural parameters of the first Venturi tube (602) and the second Venturi tube (603) are different.

8. A micro / nano bubble generator based on the double Venturi effect according to claim 1, characterized in that: The top of the plug-in base (7) is provided with a plug hole (701), and a U-shaped plug rod (702) is provided through and slidably fitted on one side of the inner wall of the plug hole (701). The outer walls of both ends of the U-shaped plug rod (702) located on the inner wall of the plug-in base (7) are fixedly connected with springs (703).

9. A micro / nano bubble generator based on the double Venturi effect according to claim 8, characterized in that: The spiral guide plate (8) has multiple diverter plates (801) fixedly connected in a spiral structure. The bottom end of the spiral guide plate (8) is fixedly connected to an opening rod (802), and the outer wall of the bottom end of the opening rod (802) is movably inserted into the insertion hole (701).

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