Efficient gas-liquid mixing and mass transfer strengthening device and method for microbial fermentation

Abstract

The invention discloses an efficient gas-liquid mixing and mass transfer strengthening device and method for microbial fermentation, and relates to the technical field of mixing devices.The efficient gas-liquid mixing and mass transfer strengthening device comprises a mixing tank and a cover plate installed at the top of the mixing tank; the multi-stage aeration mechanism is arranged in the mixing tank; the comprehensive driving mechanism is arranged at the top of the mixing tank; the stirring and mixing mechanism is arranged at the bottom of the comprehensive driving mechanism; the ultrasonic vibration mechanism is arranged on the outer side of the mixing tank; the multi-stage aeration mechanism comprises a mounting frame, the mounting frame is fixedly mounted on the outer side of the mixing tank, an air pump is mounted in the mounting frame, the input end of the air pump is connected with an air inlet pipe, and the output end of the air pump is connected with a first connecting pipe. The gas can be contacted with the liquid in a grading manner, so that the contact surface of the gas and the liquid is enlarged, the contact time of the gas and the liquid is prolonged, and the mass transfer strengthening quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of mixing devices, in particular to a high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation. Background Art

[0002] Microbial fermentation is the process of utilizing the metabolic activity of microorganisms to produce various useful substances. Many fermentation processes are aerobic, such as citric acid fermentation, gluconic acid fermentation, glutamic acid fermentation, and microbial oil fermentation. Oxygen is crucial to the physiological metabolism of aerobic microorganisms. It is a key component of cells and metabolites, and serves as an electron acceptor at the end of the respiratory chain. To ensure microbial growth and metabolism, air or oxygen must be effectively dissolved into the fermentation broth. This requires effective gas-liquid mixing and mass transfer to provide sufficient dissolved oxygen to meet the microbial needs.

[0003] The existing high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation, when in use, mainly transports gas into liquid and uses stirring equipment to stir the liquid, thereby accelerating the mixing speed of gas and liquid, thereby improving overall work efficiency.

[0004] However, the existing high-efficiency gas-liquid mixing and mass transfer enhancement devices and methods for microbial fermentation have the following shortcomings: Existing high-efficiency gas-liquid mixing and mass transfer enhancement devices for microbial fermentation cannot ensure graded contact between gas and liquid, which results in a smaller actual gas-liquid contact area and a shorter contact time, affecting the actual mixing effect. The quality of mass transfer enhancement cannot be guaranteed and it is difficult to meet actual usage needs.

[0005] Therefore, we proposed a high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation in order to solve the above-mentioned problems. Summary of the Invention

[0006] The object of the present invention is to provide an efficient gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation. By setting up a multi-stage aeration mechanism, the gas can be brought into contact with the liquid in stages, thereby expanding the contact surface between the gas and the liquid, extending the contact time between the two, and ensuring the quality of mass transfer enhancement, so as to solve the problems raised by the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions: a highly efficient gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation, comprising a mixing tank, a cover plate, mounted on the top of the mixing tank; A multi-stage aeration mechanism is arranged inside the mixing tank; A full-scale driving mechanism is provided on the top of the mixing tank; A stirring and mixing mechanism is provided at the bottom of the overall driving mechanism; An ultrasonic vibration mechanism is arranged on the outside of the mixing tank; The multi-stage aeration mechanism includes a mounting frame, which is fixedly installed on the outside of the mixing tank. An air pump is installed inside the mounting frame. The input end of the air pump is connected to an air inlet pipe, and the output end of the air pump is connected to a first connecting pipe. One end of the first connecting pipe passes through the mixing tank and is connected to a first annular pipe. The bottom of the first annular pipe is connected to multiple second connecting pipes, and the bottoms of the multiple second connecting pipes are connected to a second annular pipe. Multiple first aeration nozzles are arranged on the outside of the second annular pipe, and the bottom of the second annular pipe is connected to multiple third connecting pipes. The bottoms of the multiple third connecting pipes are connected to a third annular pipe, and the bottom of the third annular pipe is connected to multiple second aeration nozzles.

[0008] Preferably, the ultrasonic vibration mechanism includes a mounting bracket, which is installed on the outside of the mixing tank. An ultrasonic generator control terminal is installed on the surface of the mounting bracket. Two connecting wires are connected to the bottom of the ultrasonic generator control terminal. One end of the two connecting wires is connected to an ultrasonic transducer. The ultrasonic transducer is installed at the bottom of the mixing tank. Two ultrasonic conductors are provided on the top of the ultrasonic transducer, and both of the ultrasonic conductors are provided inside the mixing tank.

[0009] Preferably, the comprehensive driving mechanism includes a U-shaped frame, which is fixedly mounted on the top of the cover plate. A first servo motor is mounted on the top of the U-shaped frame. The output end of the first servo motor is movable through the U-shaped frame and is connected to a connecting shaft, one end of which is connected to a turntable.

[0010] Preferably, the stirring and mixing mechanism includes two second servo motors, both of which are installed on the top of the turntable, and the output end of each second servo motor is movable through the turntable and connected to a stirring shaft, and a plurality of stirring blades are provided on the outer side of each stirring shaft.

[0011] Preferably, a plurality of positioning and mounting mechanisms are provided on the outer side of the cover plate; The positioning and mounting mechanism includes a positioning frame, which is fixedly mounted on the outside of the mixing tank. A positioning block is inserted into the inner side of the positioning frame, which is fixedly mounted on the outside of the cover plate. A fastening bolt is installed on one side of the positioning frame, and a friction-increasing pad is sleeved on the outer side of the fastening bolt.

[0012] Preferably, a first solenoid valve is installed on the top of the outer side of the mixing tank, and one end of the first solenoid valve is connected to a liquid inlet pipe.

[0013] Preferably, a second solenoid valve is installed at the bottom of the mixing tank, and a liquid outlet pipe is connected to the bottom of the second solenoid valve.

[0014] Preferably, four legs are installed at the bottom of the mixing tank, and a non-slip pad is installed at the bottom of each leg.

[0015] Preferably, the two groups of stirring blades have the same number, and the two groups of stirring blades are staggered.

[0016] The invention relates to a highly efficient gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation, comprising the following steps: Step 1: Open the first solenoid valve, pour the liquid to be mixed into the mixing tank from the liquid inlet pipe, and then connect the gas to be mixed to the multi-stage aeration mechanism, which transports the gas to the interior of the mixing tank and contacts the liquid.

[0017] Step 2: Place the cover plate on the top of the mixing tank, and insert the four positioning blocks into the corresponding positioning frames in sequence, then tighten the fastening bolts, and use the friction pad to install and fix the cover plate and the full drive mechanism and stirring and mixing mechanism on its top.

[0018] Step 3: The gas transported to the mixing tank by the multi-stage aeration mechanism will be ejected from the first aeration nozzle and the second aeration nozzle to mix with the liquid, and the stirring and mixing mechanism will be started to stir the gas and liquid to accelerate the mixing of the two.

[0019] Step 4: Start the full-scale driving mechanism, which drives the two stirring and mixing mechanisms to revolve on the basis of rotation, so that the stirring range is larger, the stirring efficiency is improved, and the mixing speed of the gas and liquid is further accelerated.

[0020] Step 5: In the process of the comprehensive driving mechanism and the stirring and mixing mechanism cooperating with each other to stir and mix, the ultrasonic vibration mechanism is started, and the ultrasonic vibration mechanism generates ultrasonic waves. The ultrasonic waves are transmitted into the mixing tank through the ultrasonic conductor and converted into mechanical vibrations, causing the bubbles in the liquid to burst.

[0021] Step 6: After the gas and liquid are mixed and the mass transfer is enhanced, the second solenoid valve is opened to discharge the mixed liquid from the liquid outlet pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a multi-stage aeration mechanism, thereby achieving graded contact between gas and liquid, thereby expanding the contact area between gas and liquid, and prolonging the contact time between gas and liquid, so that the gas and liquid are better mixed together, thereby improving the quality of mass transfer enhancement during gas-liquid mixing and meeting actual use needs.

[0023] 2. The present invention provides an ultrasonic vibration mechanism, thereby utilizing ultrasonic vibration to cause bubbles in the liquid to burst when the gas and liquid are mixed, thereby ensuring that the gas can be completely dissolved in the liquid, making the contact between the two more complete, thereby improving the quality of mixing.

[0024] 3. The present invention provides a comprehensive driving mechanism to drive the rotating stirring and mixing mechanism to revolve, thereby expanding the stirring range, improving the stirring efficiency, making the gas-liquid mixing more complete, and further improving the quality of the gas-liquid mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a perspective view of the main structure of the high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation of the present invention; Figure 2 A side structural perspective diagram of the high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation according to the present invention; Figure 3 This is a perspective view of the cross-sectional structure of the high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation of the present invention; Figure 4 This is an enlarged stereoscopic view of the multi-stage aeration mechanism in the high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation of the present invention; Figure 5 This is an enlarged perspective view of the overall driving mechanism in the high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation of the present invention; Figure 6 This is an enlarged perspective view of the stirring and mixing mechanism in the high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation of the present invention; Figure 7 This is an enlarged perspective view of the ultrasonic vibration mechanism in the high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation of the present invention; Figure 8 This is an enlarged stereoscopic view of the positioning and mounting mechanism of the high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation of the present invention.

[0026] Figure: 1. Mixing tank; 2. Cover plate; 3. Multi-stage aeration mechanism; 301. Mounting frame; 302. Air pump; 303. Air inlet pipe; 304. First connecting pipe; 305. First annular pipe; 306. Second connecting pipe; 307. Second annular pipe; 308. First aeration nozzle; 309. Third connecting pipe; 310. Third annular pipe; 311. Second aeration nozzle; 4. Full drive mechanism; 401. U-shaped frame; 402. First servo motor; 403. Connecting shaft; 404. Turntable; 5. Stirring and mixing mechanism ; 501, second servo motor; 502, stirring shaft; 503, stirring blade; 6, ultrasonic vibration mechanism; 601, mounting bracket; 602, ultrasonic generator control terminal; 603, connecting wire; 604, ultrasonic transducer; 605, ultrasonic conductor; 7, positioning installation mechanism; 701, positioning frame; 702, positioning block; 703, fastening bolt; 704, friction pad; 8, first solenoid valve; 9, liquid inlet pipe; 10, second solenoid valve; 11, liquid outlet pipe; 12, tripod; 13, anti-slip pad. DETAILED DESCRIPTION

[0027] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0028] Please see the attached Figure 1 -Attached Figure 8 As shown, the present invention provides a technical solution: a high-efficiency gas-liquid mixing and mass transfer enhancement device and method for microbial fermentation, comprising a mixing tank 1, A cover plate 2 is installed on the top of the mixing tank 1; The multi-stage aeration mechanism 3 is arranged inside the mixing tank 1; A full driving mechanism 4 is provided on the top of the mixing tank 1; The stirring and mixing mechanism 5 is arranged at the bottom of the full-scale driving mechanism 4; The ultrasonic vibration mechanism 6 is arranged outside the mixing tank 1; The multi-stage aeration mechanism 3 includes a mounting frame 301, which is fixedly mounted on the outside of the mixing tank 1. An air pump 302 is installed inside the mounting frame 301. The input end of the air pump 302 is connected to an air inlet pipe 303. The output end of the air pump 302 is connected to a first connecting pipe 304. One end of the first connecting pipe 304 passes through the mixing tank 1 and is connected to a first annular pipe 305. The bottom of the first annular pipe 305 is connected to a plurality of second connecting pipes 306. The bottoms of the plurality of second connecting pipes 306 are connected to a second annular pipe 307. The outside of the second annular pipe 307 is provided with a plurality of first aeration nozzles 308. The bottom of the second annular pipe 307 is connected to a plurality of third connecting nozzles 309. Tube 309, the bottoms of the multiple third connecting tubes 309 are connected to a third annular tube 310, and the bottoms of the third annular tube 310 are connected to multiple second aeration nozzles 311. Through the arrangement of the multi-stage aeration mechanism 3, effective contact between gas and liquid can be achieved at multiple levels. This hierarchical contact method significantly expands the contact area between gas and liquid, while extending the residence time of gas in liquid. Such a design enables gas to be more fully mixed with liquid, thereby greatly improving the mass transfer efficiency during the gas-liquid mixing process. In this way, the mixing quality of gas and liquid can be significantly improved to meet the needs of various practical applications.

[0029] according to Figure 1 、 Figure 3 and Figure 7As shown, the ultrasonic vibration mechanism 6 includes a mounting bracket 601, which is mounted on the outside of the mixing tank 1. An ultrasonic generator control terminal 602 is mounted on the surface of the mounting bracket 601. Two connecting wires 603 are connected to the bottom of the ultrasonic generator control terminal 602. One end of the two connecting wires 603 is connected to an ultrasonic transducer 604. The ultrasonic transducer 604 is mounted on the bottom of the mixing tank 1. Two ultrasonic conductors 605 are set on the top of the ultrasonic transducer 604. Both ultrasonic conductors 605 are set inside the mixing tank 1. Through the setting of the ultrasonic vibration mechanism 6, ultrasonic vibration technology can be effectively utilized to promote the rupture of bubbles inside the liquid during the gas-liquid mixing process. This process is crucial to ensuring that the gas can be completely dissolved in the liquid because it can make the contact between the gas and the liquid more thorough and uniform. In this way, the mixing process can be significantly improved. The quality of the process is ensured to ensure the uniformity and stability of the final mixture. Among them, ultrasonic vibration technology is an existing technology, which mainly inputs 220V or 380V AC power to the ultrasonic generator control terminal 602, converts the AC power into DC power through a rectifier circuit, and then converts the DC power into high-frequency AC power using power devices through an inverter circuit. The frequency is usually between 20kHz and 10MHz. The generated high-frequency AC signal is regulated and amplified, and the amplified high-frequency electrical signal is transmitted to the ultrasonic transducer 604 by the connecting wire 603. It works based on the inverse piezoelectric effect - when a high-frequency alternating electric field is applied to both ends of the piezoelectric material, the material will produce periodic expansion and contraction deformation, converting electrical energy into mechanical energy, and then generating high-frequency mechanical vibration to form ultrasonic waves. The vibration is transmitted into the liquid through the ultrasonic conductor 605 in the form of mechanical waves, triggering the cavitation effect of bubbles in the liquid, achieving the purpose of bubble breakage and strengthening gas-liquid mixing.

[0030] according to Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6 As shown, the full-scale driving mechanism 4 includes a U-shaped frame 401, which is fixedly mounted on the top of the cover plate 2. A first servo motor 402 is mounted on the top of the U-shaped frame 401. The output end of the first servo motor 402 is movable through the U-shaped frame 401 and is connected to a connecting shaft 403. One end of the connecting shaft 403 is connected to a turntable 404. Through the setting of the full-scale driving mechanism 4, the self-rotating stirring and mixing mechanism 5 can be driven to revolve, thereby effectively expanding the stirring coverage and significantly improving the stirring efficiency. This innovative stirring method ensures that the gas-liquid mixing process is more uniform and sufficient, thereby further improving the quality of the gas-liquid mixing and ensuring the quality of the final product.

[0031] according to Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 and Figure 6 As shown, the stirring and mixing mechanism 5 includes two second servo motors 501, and the two second servo motors 501 are both installed on the top of the turntable 404. The output end of each second servo motor 501 is movable through the turntable 404 and is connected to a stirring shaft 502. A plurality of stirring blades 503 are provided on the outer side of each stirring shaft 502. Through the setting of the stirring and mixing mechanism 5, the mixing and stirring of gas and liquid can be effectively achieved. This stirring mechanism not only promotes full contact between gas and liquid, but also significantly speeds up the speed of the mixing process. With the improvement of mixing efficiency, the overall working efficiency of the entire system is also effectively enhanced, thereby achieving higher efficiency and better results in industrial production or experimental operations.

[0032] according to Figure 1 、 Figure 2 and Figure 5 As shown, a plurality of positioning and mounting mechanisms 7 are provided on the outer side of the cover plate 2; The positioning and installation mechanism 7 includes a positioning frame 701, which is fixedly installed on the outside of the mixing tank 1. A positioning block 702 is inserted on the inner side of the positioning frame 701, and the positioning block 702 is fixedly installed on the outside of the cover plate 2. A fastening bolt 703 is installed on one side of the positioning frame 701, and a friction pad 704 is sleeved on the outer side of the fastening bolt 703. Through the setting of the positioning and installation mechanism 7, the comprehensive driving mechanism 4 and the stirring and mixing mechanism 5 on the cover plate 2 can be accurately positioned and installed. This process is crucial to ensuring the stability of the entire device during operation, because it can effectively prevent unnecessary shaking of the device due to unstable factors during the stirring process. In addition, through such positioning and installation, the safety of the device during use is also significantly improved, thereby providing a safer and more reliable working environment for the operator.

[0033] according to Figure 1 、 Figure 2 and Figure 3 As shown, a first solenoid valve 8 is installed on the outer top of the mixing tank 1, and one end of the first solenoid valve 8 is connected to a liquid inlet pipe 9. Through the setting of the first solenoid valve 8 and the liquid inlet pipe 9, the liquid can be quickly infused into the internal space of the mixing tank 1. This process not only simplifies the operating steps and reduces the difficulty of using the device, but also significantly improves the efficiency of the entire workflow, thereby effectively improving the performance of the entire device.

[0034] according to Figure 2As shown, a second solenoid valve 10 is installed at the bottom of the mixing tank 1, and a liquid outlet pipe 11 is connected to the bottom of the second solenoid valve 10. Through the setting of the second solenoid valve 10 and the liquid outlet pipe 11, the fully mixed liquid can be quickly discharged from the mixing tank 1. This process can not only save a lot of manual labor, but also significantly reduce the time cost required. In this way, the overall work efficiency is greatly improved, making the production process more efficient and smooth.

[0035] according to Figure 1 、 Figure 2 and Figure 3 As shown, four legs 12 are installed at the bottom of the mixing tank 1, and an anti-slip pad 13 is installed at the bottom of each leg 12. Through the carefully designed legs 12 and the matching anti-slip pads 13, a stable support base can be effectively provided for the mixing tank 1. This structure not only ensures the stability of the mixing tank during operation, but also significantly increases the friction between the device and the ground through the use of the anti-slip pads 13. In this way, even when the mixing tank 1 is performing high-intensity work, it can effectively prevent sliding displacement caused by vibration or external force, thereby greatly improving the stability and safety of the entire device.

[0036] according to Figure 3 、 Figure 5 and Figure 6 As shown, the number of the two groups of stirring blades 503 is equal, and the two groups of stirring blades 503 are staggered. Through the carefully designed staggered setting of the two groups of stirring blades 503, it is ensured that during the stirring process, the liquids at different levels can be fully mixed and stirred. This unique setting significantly improves the stirring effect, thereby effectively improving the overall quality of the mixture.

[0037] Working principle: First, move the device to the designated position so that the anti-slip pad 13 contacts the ground, and provide stable support for the mixing tank 1 through the tripod 12. Then, connect the external power supply equipment to the electrical equipment inside the device to provide it with stable energy supply to ensure the normal operation of the device. Then, form a closed information interaction and collaborative operation between the external servo control system and the servo equipment inside the device to achieve an efficient and stable control solution.

[0038] In the preparation stage, first, open the first solenoid valve 8 and pour the liquid to be mixed into the mixing tank 1 from the liquid inlet pipe 9. Then, place the cover plate 2 on the top of the mixing tank 1, and insert the four positioning blocks 702 into the corresponding positioning frames 701 in turn. Then, tighten the fastening bolts 703 and cooperate with the friction pad 704 to fix the cover plate 2 as a whole on the top of the mixing tank 1.

[0039] During the gas addition and premixing stage, sterile gas or sterile air is first introduced into the air inlet pipe 303. Next, the external servo control system controls the air pump 302 to start. The air pump 302 draws the gas from the air inlet pipe 303 and transports it to the first annular pipe 305 through the first connecting pipe 304. The gas then enters the second annular pipe 307 and the third annular pipe 310 through the second connecting pipe 306 and the third connecting pipe 309, respectively. The first aeration nozzle 308 sprays out larger gas, and the second aeration nozzle 311 sprays out finer gas, so that the gas comes into contact with the liquid.

[0040] In the gas-liquid mixing stage, first, the two second servo motors 501 are controlled by the external servo control system to start, and the second servo motors 501 drive the corresponding stirring shafts 502 to drive the stirring blades 503 to rotate, so as to stir and mix the gas and liquid. Then, the first servo motor 402 is controlled by the external servo control system to start, and the first servo motor 402 drives the connecting shaft 403 to drive the turntable 404 to rotate, so as to promote the two full-scale driving mechanisms 4 to revolve, thereby improving the stirring and mixing effect. Then, the ultrasonic generator control terminal 602 is started, and the connecting wire 603 transmits the amplified high-frequency electrical signal to the ultrasonic transducer 604, which converts the electrical energy into mechanical energy and releases it into the liquid through the ultrasonic conductor 605, so that the bubbles in the liquid burst, and the gas and liquid are fully in contact.

[0041] In the finished product discharge stage, after the gas and liquid are mixed and the mass transfer is enhanced, the second solenoid valve 10 is opened to discharge the finished product from the liquid outlet pipe 11.

[0042] By operating according to the above-described contents, the use of the high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation can be completed.

[0043] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An efficient gas-liquid mixing and mass transfer enhancement device for microbial fermentation, characterized by: including a mixing tank (1), A cover plate (2) is mounted on the top of the mixing tank (1); A multi-stage aeration mechanism (3) is arranged inside the mixing tank (1); A full-scale driving mechanism (4) is arranged on the top of the mixing tank (1); A stirring and mixing mechanism (5) is arranged at the bottom of the full-scale driving mechanism (4); An ultrasonic vibration mechanism (6) is arranged outside the mixing tank (1); The multi-stage aeration mechanism (3) comprises a mounting frame (301), the mounting frame (301) being fixedly mounted on the outside of the mixing tank (1), an air pump (302) being mounted inside the mounting frame (301), an input end of the air pump (302) being connected to an air inlet pipe (303), an output end of the air pump (302) being connected to a first connecting pipe (304), one end of the first connecting pipe (304) passing through the mixing tank (1) and being connected to a first annular pipe (305), the first annular pipe (305) having a The bottom is connected to a plurality of second connecting pipes (306), the bottoms of the plurality of second connecting pipes (306) are connected to a second annular pipe (307), the outer side of the second annular pipe (307) is provided with a plurality of first aeration nozzles (308), the bottom of the second annular pipe (307) is connected to a plurality of third connecting pipes (309), the bottoms of the plurality of third connecting pipes (309) are connected to a third annular pipe (310), and the bottom of the third annular pipe (310) is connected to a plurality of second aeration nozzles (311).

2. The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 1, characterized in that: The ultrasonic vibration mechanism (6) includes a mounting bracket (601), the mounting bracket (601) is mounted on the outside of the mixing tank (1), an ultrasonic generator control terminal (602) is mounted on the surface of the mounting bracket (601), two connecting wires (603) are connected to the bottom of the ultrasonic generator control terminal (602), one end of the two connecting wires (603) is connected to an ultrasonic transducer (604), the ultrasonic transducer (604) is mounted on the bottom of the mixing tank (1), and two ultrasonic conductors (605) are provided on the top of the ultrasonic transducer (604), and the two ultrasonic conductors (605) are both arranged inside the mixing tank (1).

3. The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 2, characterized in that: The full-scale driving mechanism (4) comprises a U-shaped frame (401), wherein the U-shaped frame (401) is fixedly mounted on the top of the cover plate (2), a first servo motor (402) is mounted on the top of the U-shaped frame (401), an output end of the first servo motor (402) movably passes through the U-shaped frame (401) and is connected to a connecting shaft (403), and one end of the connecting shaft (403) is connected to a turntable (404).

4. The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 3, characterized in that: The stirring and mixing mechanism (5) includes two second servo motors (501), both of which are mounted on the top of the turntable (404), and the output end of each second servo motor (501) is movable through the turntable (404) and connected to a stirring shaft (502), and a plurality of stirring blades (503) are provided on the outer side of each stirring shaft (502).

5. The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 4, characterized in that: A plurality of positioning and mounting mechanisms (7) are provided on the outer side of the cover plate (2); The positioning and mounting mechanism (7) comprises a positioning frame (701), the positioning frame (701) being fixedly mounted on the outside of the mixing tank (1), a positioning block (702) being inserted into the inner side of the positioning frame (701), the positioning block (702) being fixedly mounted on the outer side of the cover plate (2), a fastening bolt (703) being mounted on one side of the positioning frame (701), and a friction-increasing pad (704) being sleeved on the outer side of the fastening bolt (703).

6. The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 5, characterized in that: A first solenoid valve (8) is installed on the top of the outer side of the mixing tank (1), and one end of the first solenoid valve (8) is connected to a liquid inlet pipe (9).

7. The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 6, characterized in that: A second solenoid valve (10) is installed at the bottom of the mixing tank (1), and a liquid outlet pipe (11) is connected to the bottom of the second solenoid valve (10).

8. The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 7, characterized in that: Four legs (12) are installed at the bottom of the mixing tank (1), and a non-slip pad (13) is installed at the bottom of each leg (12).

9. The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 8, characterized in that: The two groups of stirring blades (503) are equal in number, and the two groups of stirring blades (503) are staggered.

10. A method for efficient gas-liquid mixing and mass transfer enhancement for microbial fermentation, characterized in that: The high-efficiency gas-liquid mixing and mass transfer enhancement device for microbial fermentation according to claim 9 is used. The following steps are involved: S1: Open the first solenoid valve (8), pour the liquid to be mixed into the interior of the mixing tank (1) from the liquid inlet pipe (9), and then connect the gas to be mixed to the multi-stage aeration mechanism (3), and the multi-stage aeration mechanism (3) transports the gas into the interior of the mixing tank (1) and contacts the liquid; S2: Place the cover plate (2) on the top of the mixing tank (1), and insert the four positioning blocks (702) into the corresponding positioning frames (701) in sequence, then tighten the fastening bolts (703), and use the friction pad (704) to install and fix the cover plate (2) and the full-scale driving mechanism (4) and stirring and mixing mechanism (5) on the top of the cover plate (2); S3: The gas transported to the mixing tank (1) by the multi-stage aeration mechanism (3) is ejected from the first aeration nozzle (308) and the second aeration nozzle (311) to mix with the liquid, and the stirring and mixing mechanism (5) is activated to stir the gas and liquid to accelerate the mixing of the two. S4: starting the full-scale driving mechanism (4), which drives the two stirring and mixing mechanisms (5) to perform revolution on the basis of rotation, thereby expanding the stirring range and improving the stirring efficiency, thereby further accelerating the mixing speed of the gas and liquid; S5: During the process of the full-scale driving mechanism (4) and the stirring and mixing mechanism (5) cooperating with each other to stir and mix, the ultrasonic vibration mechanism (6) is activated, and the ultrasonic vibration mechanism (6) generates ultrasonic waves, which are transmitted into the mixing tank (1) through the ultrasonic conductor (605) and converted into mechanical vibrations, thereby causing bubbles in the liquid to burst; S6: After the gas and liquid are mixed and the mass transfer is enhanced, the second solenoid valve (10) is opened to discharge the mixed liquid from the liquid outlet pipe (11).

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