Fermentation tank capable of adjusting air flow for defoaming and use method of fermentation tank

Abstract

The fermentation tank comprises a tank body, the top wall of the tank body is provided with a defoaming air inlet valve capable of adjusting flow, the side wall of the tank body is vertically provided with a first hanging lug, and a rotating shaft driven by a driving device to rotate is vertically arranged in the tank body; the first fixing piece is coaxially and fixedly arranged on the periphery of the rotating shaft, an annular closed first ring cavity is formed in the first fixing piece, and a second hanging lug is arranged on the peripheral wall of the first fixing piece; the first annular cavity is communicated with the defoaming air inlet valve through a connecting pipe penetrating through the tank wall; the two ends of the connecting cross rod are hinged to the first hanging lug and the second hanging lug respectively, and the connecting cross rod is used for supporting the first fixing piece in the tank body and allowing the rotating shaft to drive the first fixing piece to rotate synchronously; according to the defoaming device, the defects of fixed-point defoaming, local defoaming, excessive chemical additives and the like of a traditional defoaming mode are overcome through system feedback adjustment, meanwhile, the connecting cross rod is adjustable, and the first fixing piece is adjusted and fixed.

Description

Technical Field

[0001] This invention relates to a fermenter with adjustable airflow defoaming and its method of use. Background Technology

[0002] During fermentation, microorganisms continuously consume nutrients and produce metabolic products. At the same time, the large amount of aeration and continuous stirring cause foam to be generated in the fermentation broth. This foam will gradually accumulate on the surface of the liquid. Excessive foam will have a certain impact on the gas exchange of the fermentation broth. If the foam is close to the top of the tank, it will escape out of the tank with the exhaust gas. In addition to wasting the fermentation broth and products, it also poses a great risk of contamination.

[0003] Traditional defoaming methods include: Chemical defoaming: Chemical defoaming involves adding chemical defoamer immediately after foam reaches a certain height. This is currently the main method, but the chemical composition of the defoamer can significantly impact the product. Defoaming paddle: Mechanical defoaming is achieved through the rake teeth on the defoaming paddle, but it only provides a weak auxiliary effect. Air pressure defoaming: An air inlet pipe is installed at the top, with small holes drilled in the pipe inside the can. Once foam reaches a certain height, the air inlet valve is opened, and air is ejected through the small holes, blowing towards the foam. The resulting air pressure breaks the foam. However, the small holes are fixed in position, resulting in a small effective range. The airflow lacks direction and diffuses quickly after being blown out, making the effect consistently unsatisfactory. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a fermenter with adjustable airflow defoaming and its usage method. A rotating shaft connects the first annular cavity, the air groove, and the second annular cavity into a high-speed air passage. The gas rotates with the shaft, achieving dynamic flow without the need for an additional rotary joint. This eliminates one sealing leakage point compared to a fixed jet pipe. The connecting crossbar is composed of a first connecting rod and a second connecting rod that slide crosswise. A trapezoidal pressure block can simultaneously lock the two connecting rods with a single push. The distance between the defoaming paddle and the tank wall is adjustable, improving the shearing efficiency for high-viscosity batches. This eliminates the drawbacks of traditional defoaming methods, such as fixed-point defoaming, localized defoaming, and excessive chemical additives. At the same time, the adjustable connecting crossbar allows for adjustment and fixation of the first fixing component.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a fermenter with adjustable airflow defoaming, comprising: The tank body has an adjustable flow defoaming air inlet valve on its top wall, a first hanging lug vertically on its side wall, and a rotating shaft driven by a drive device vertically inside it. The first fixing member is coaxially fixed to the outer periphery of the rotating shaft. It has an annular sealed first annular cavity inside and a second hanging lug on its outer peripheral wall. The first annular cavity is connected to the defoaming air inlet valve through a connecting pipe passing through the tank wall. The connecting crossbar is hinged at both ends to the first and second hanging ears respectively, and is used to support the first fixing member in the tank body and allow the rotating shaft to drive the first fixing member to rotate synchronously. The second fixing member is located below the first fixing member and is coaxially fixed to the outer periphery of the rotating shaft. It has an annular sealed second annular cavity inside, and at least two radially extending defoaming paddles are fixed to its outer peripheral wall. The airflow channel is composed of an air groove located at the center of the rotation axis and extending axially. The upper end of the air groove is connected to the first annular cavity and the lower end is connected to the second annular cavity. The capacitive level gauge is fixed to the inner wall of the tank and located above the defoaming paddle.

[0006] As a preferred embodiment of the present invention, the defoaming paddle is provided with a tube groove, the tube groove is connected to the second annular cavity, a plurality of insert tubes are provided below the defoaming paddle, and an annular plate is provided on the outside of the insert tubes.

[0007] As a preferred embodiment of the present invention, an air knife device is provided below the defoaming paddle. The air knife device includes two half plates, each half plate having an inner cavity. One end of the inner cavity has a through groove, and the through groove has an annular groove. An insert is embedded in the through groove, and the annular plate is embedded in the annular groove.

[0008] As a preferred embodiment of the present invention, the inner cavity sidewall is provided with a pressure groove, a sealing strip is provided in the pressure groove, and an air vent is provided in the inner cavity.

[0009] As a preferred embodiment of the present invention, the connecting crossbar includes a first connecting rod and a second connecting rod. The first connecting rod is provided with a first straight groove, a first threaded shaft is provided on one side of the first connecting rod, and a second threaded shaft is provided on the other side.

[0010] As a preferred embodiment of the present invention, the second connecting rod is provided with a second straight groove, one side of the second connecting rod is provided with a third threaded shaft, and the other side is provided with a fourth threaded shaft. The second threaded shaft passes through the second straight groove, and the fourth threaded shaft passes through the first straight groove.

[0011] As a preferred embodiment of the present invention, the connecting crossbar is provided with an adjusting member, the adjusting member including a first sleeve plate and a second sleeve plate, the first sleeve plate being sleeved on the fourth threaded shaft, the second sleeve plate being sleeved on the first threaded shaft, and a trapezoidal pressure block being provided between the first sleeve plate and the second sleeve plate.

[0012] As a preferred embodiment of the present invention, both the first and second sets of plates are provided with a base plate, the base plate is provided with a vertical shaft, the trapezoidal pressure block is provided with a long groove, and the vertical shaft is embedded in the long groove.

[0013] As a preferred embodiment of the present invention, a first magnetic pole is provided on the base plate, and a second magnetic pole is provided on the bottom surface of the trapezoidal pressing block, wherein the first magnetic pole and the second magnetic pole attract each other.

[0014] The present invention also provides a technical solution, a method for using a fermenter with adjustable airflow defoaming, the specific steps of which are as follows: S1. Check that the defoaming air inlet valve is closed, confirm that the connecting crossbar has horizontally supported the first fixing part in the tank, and that the second fixing part and the defoaming paddle are synchronously fixed on the rotating shaft. Visually observe that the reading of the capacitance level gauge is zero. S2. Inject fermentation liquid into the tank until the liquid level is close to but below the detection end of the capacitive level gauge, start the drive device, and the rotating shaft drives the first fixing part, the second fixing part and the defoaming paddle to rotate synchronously. S3. Slowly open the defoaming air inlet valve. Compressed gas passes through the connecting pipe, the first annular cavity, the air groove, and the second annular cavity in sequence, and is finally sprayed out from the pipe groove on the liquid-facing surface of the defoaming paddle. S4. When the foam generated during the fermentation process rises to the detection height of the capacitive level gauge, the capacitive level gauge outputs a signal. Based on this signal, the operator increases the opening of the defoaming air inlet valve and increases the air volume, so that the foam layer is broken by the mechanical shearing of the defoaming paddle and the microporous airflow. S5. Gas continues to enter the inner cavity of the half-plate through the insertion tube, and then forms an air knife from the air outlet to further cut the residual foam; the sealing strip in the pressure groove keeps the inner cavity sealed. S6. If the distance between the defoaming paddle and the tank wall needs to be adjusted during operation: Loosen the locking nuts on the first, second, third, and fourth threaded shafts, move the trapezoidal pressure block so that it slides relative to the vertical axis along the long groove, the first connecting rod and the second connecting rod slide relative to each other in the first and second straight grooves, the total length of the connecting crossbar changes accordingly, the first magnetic pole and the second magnetic pole attract each other, temporarily fix the trapezoidal pressure block, and retighten the locking nuts on each threaded shaft to complete the length locking and keep the defoaming paddle in the optimal radial position.

[0015] Compared with the prior art, the beneficial effects of this invention are as follows: the rotating shaft connects the first annular cavity, the gas groove, and the second annular cavity into a high-speed gas channel, and the gas rotates with the shaft, achieving dynamic flow without the need for an additional rotary joint. It has one less sealing leakage point than a fixed jet pipe. The connecting crossbar is composed of the cross sliding of the first connecting rod and the second connecting rod. The trapezoidal pressure block can simultaneously lock the first connecting rod and the second connecting rod with one push. The distance between the defoaming paddle and the tank wall is adjustable, improving the shearing efficiency of high viscosity batches. It gets rid of the drawbacks of traditional defoaming methods such as fixed-point defoaming, local defoaming, and excessive chemical additives. At the same time, the connecting crossbar is adjustable to adjust and fix the first fixing part. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the internal structure of the shell in this invention; Figure 2 This is a schematic diagram of the air tank structure in this invention; Figure 3 This is a schematic diagram of the structure of the defoaming paddle in this invention; Figure 4 This is a schematic diagram of the placement structure of the first and second fixing members in this invention; Figure 5 This is a schematic diagram of the connecting crossbar structure in this invention; Figure 6 This is a schematic diagram of the structure of the first link and the second link in this invention; Figure 7 This is a schematic diagram of the adjusting component in this invention.

[0017] Wherein: 100, tank body; 101, rotating shaft; 101a, air tank; 102, defoaming air inlet valve; 103, first hanging lug; 104, capacitive level gauge; 105, connecting pipe; 200, first fixing component; 201, second hanging lug; 202, first annular cavity; 300, connecting crossbar; 301, first connecting rod; 301a, first straight groove; 301b, first threaded shaft; 301c, second threaded shaft; 302, second connecting rod; 302a, second straight groove; 302b, third threaded shaft; 302c, fourth threaded shaft; 40 0. Second fixing component; 401. Second annular cavity; 500. Defoaming paddle; 501. Pipe groove; 502. Inserted pipe; 503. Annular plate; 600. Half plate; 601. Inner cavity; 601a. ​​Pressing groove; 602. Through groove; 603. Annular groove; 604. Air outlet; 700. Adjusting component; 701. First sleeve plate; 702. Second sleeve plate; 703. Trapezoidal pressing block; 703a. Long groove; 703b. Second magnetic pole; 704. Base plate; 704a. First magnetic pole; 705. Vertical shaft; 706. Press-fit nut; 707. Limiting groove. Detailed Implementation

[0018] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0019] like Figure 1 - Figure 7As shown, this embodiment proposes a fermenter with adjustable airflow defoaming, comprising: a tank body 100, the top wall of which is provided with an adjustable flow defoaming air inlet valve 102, the side wall of which is provided with a first hanging ear 103 vertically, and the interior of which is provided with a rotating shaft 101 driven to rotate by a driving device; a first fixing member 200, coaxially fixed to the outer periphery of the rotating shaft 101, the interior of which is provided with an annular sealed first annular cavity 202, and the outer peripheral wall of which is provided with a second hanging ear 201; the first annular cavity 202 is connected to the defoaming air inlet valve 102 via a connecting pipe 105 passing through the tank wall; and a connecting crossbar 300, the two ends of which are respectively hinged to the first hanging ear 103 and the second hanging ear 201, for supporting the first fixing member 200 inside the tank body 100. The rotating shaft 101 allows the first fixing member 200 to rotate synchronously; the second fixing member 400 is located below the first fixing member 200 and coaxially fixed to the outer periphery of the rotating shaft 101, and has an annular sealed second annular cavity 401 inside, and at least two radially extending defoaming paddles 500 are fixed to its outer peripheral wall, and the liquid-facing surface of the defoaming paddles 500 is distributed with micro-hole nozzles 501 communicating with the second annular cavity 401; the airflow channel is composed of an air groove 101a located at the center of the rotating shaft 101 and extending axially, the upper end of the air groove 101a communicating with the first annular cavity 202 and the lower end communicating with the second annular cavity 401; the capacitive liquid level gauge 104 is fixed to the inner wall of the tank 100 and located above the defoaming paddles 500; The rotating shaft connects the first annular cavity 202, the gas groove 101a, and the second annular cavity 401 into a high-speed gas channel. The gas rotates with the shaft, achieving dynamic flow without the need for an additional rotary joint. Compared with a fixed jet pipe, it has one less sealing leakage point. The connecting crossbar 300 is composed of the cross sliding of the first connecting rod 301 and the second connecting rod 302. The trapezoidal pressure block 703 can simultaneously lock the first connecting rod 301 and the second connecting rod 302 with one push. The distance between the defoaming paddle 500 and the tank wall is adjustable, improving the shearing efficiency of high viscosity batches. It gets rid of the drawbacks of traditional defoaming methods such as fixed-point defoaming, local defoaming, and excessive chemical additives. At the same time, the connecting crossbar 300 is adjustable to adjust and fix the first fixing part 200. The defoaming propeller 500 has a groove 501 that communicates with the second annular cavity 401. Multiple insertion tubes 502 are located below the defoaming propeller 500, and an annular plate 503 is provided on the outer side of each insertion tube 502. The groove 501 acts as an air distribution channel within the propeller, and the insertion tubes 502 form downward-extending nozzles. The annular plate 503 has an annular protrusion on the outer wall of the insertion tube. This protrusion provides a mechanical interface for the subsequent air knife module to be inserted, removed, and sealed, allowing the airflow to leave the lower surface of the propeller blade and continue to be sprayed downwards, thus expanding the defoaming depth.

[0020] Below the defoaming propeller 500 is an air knife device, which includes two half-plates 600. Each half-plate 600 has an inner cavity 601. One end of the inner cavity 601 has a through groove 602, and the through groove 602 has an annular groove 603. An insert tube 502 is embedded in the through groove 602, and the annular plate 503 is embedded in the annular groove 603. The through groove 602 provides radial positioning, and the annular groove 603 provides axial engagement. During assembly, simply snap the half-plate onto the insert tube; no additional fasteners are required. The air knife's inner cavity 601 converges the airflow from the insert tube into a linear outlet, forming a thin and fast air curtain that performs secondary cutting of residual foam behind the propeller, compensating for the dead zones of a single mechanical propeller.

[0021] The inner cavity 601 has a pressure groove 601a on its side wall, and a sealing strip is installed in the pressure groove 601a. ​​The inner cavity 601 is equipped with an air vent 604. The sealing strip is embedded in the pressure groove 601a. ​​When the annular plate 503 is clamped into the annular groove 603, the sealing strip is compressed to achieve gas sealing. The air vent 604 is a narrow slit that guides the airflow of the inner cavity 601 to the outside, forming an air knife jet. This design solves both the problems of disassembly and airtightness. After disassembly and cleaning, reassembly does not require Teflon tape or glue.

[0022] The connecting crossbar 300 includes a first connecting rod 301 and a second connecting rod 302. The first connecting rod 301 is provided with a first straight groove 301a. One side of the first connecting rod 301 is provided with a first threaded shaft 301b, and the other side is provided with a second threaded shaft 301c. The straight groove provides sliding freedom, and the threaded shaft acts as the force transmission point for subsequent locking and adjustment, making the length of the crossbar adjustable, thereby changing the radial distance between the first fixing member 200 and the tank wall to adapt to the shear strength requirements of fermentation liquids of different viscosities.

[0023] The second connecting rod 302 is provided with a second straight groove 302a. One side of the second connecting rod 302 is provided with a third threaded shaft 302b, and the other side is provided with a fourth threaded shaft 302c. The second threaded shaft 301c is provided through the second straight groove 302a, and the fourth threaded shaft 302c is provided through the first straight groove 301a. The first threaded shaft, the second threaded shaft, the third threaded shaft, and the fourth threaded shaft slide freely in the groove, but are restricted from rotating by the groove wall, so as to achieve a pure linear adjustment that can only extend and retract and cannot deflect, ensuring that the defoaming paddle 500 remains concentric with the rotating shaft after adjustment.

[0024] An adjusting component 700 is provided on the connecting crossbar 300. The adjusting component 700 includes a first sleeve plate 701 and a second sleeve plate 702. The first sleeve plate 701 is sleeved on the fourth threaded shaft 302c, and the second sleeve plate 702 is sleeved on the first threaded shaft 301b. A trapezoidal pressure block 703 is provided between the first sleeve plate 701 and the second sleeve plate 702. When the trapezoidal pressure block 703 is axially pressed in, the first sleeve plate and the second sleeve plate are spread apart, causing the two connecting rods to move in opposite directions along the straight groove, and the crossbar is instantly extended; it can be shortened by pushing it back in the opposite direction. A base plate 704 is provided on both the first sleeve plate 701 and the second sleeve plate 702. A vertical shaft 705 is provided on the base plate 704. A long groove 703a is provided on the trapezoidal pressure block 703, and the vertical shaft 705 is embedded in the long groove 703a. The base plate 704 is provided with a first magnetic pole 704a, and the bottom surface of the trapezoidal pressure block 703 is provided with a second magnetic pole 703b. The first magnetic pole 704a and the second magnetic pole 703b attract each other. When the trapezoidal pressure block 703 is pushed to the working position, the two magnetic poles attract each other and provide a self-locking force instantly to prevent the wedge block from retracting due to shaft vibration. When it is necessary to release, it is only necessary to push it in the opposite direction with an external force greater than the magnetic attraction force.

[0025] How to use a fermenter with adjustable airflow defoaming: S1. Check that the defoaming air inlet valve 102 is closed, confirm that the connecting crossbar 300 has horizontally supported the first fixing part 200 in the tank body 100, and that the second fixing part 400 and the defoaming paddle 500 are simultaneously fixed on the rotating shaft 101. Visually observe that the reading of the capacitor level gauge 104 is zero. S2. Inject fermentation liquid into tank 100 until the liquid level is close to but lower than the detection end of capacitive level gauge 104. Start the drive device and rotate shaft 101 to drive the first fixing part 200, the second fixing part 400 and the defoaming paddle 500 to rotate synchronously. S3. Slowly open the defoaming air inlet valve 102. The compressed gas passes through the connecting pipe 105, the first annular cavity 202, the air groove 101a, and the second annular cavity in sequence, and is finally sprayed out from the pipe groove 501 on the liquid-facing surface of the defoaming paddle 500. S4. When the foam generated during the fermentation process rises to the detection height of the capacitive level gauge 104, the capacitive level gauge 104 outputs a signal. Based on this signal, the operator increases the opening of the defoaming air inlet valve 102 and increases the air volume, so that the foam layer is broken by the mechanical shearing of the defoaming paddle 500 and the microporous airflow. S5. The gas continues to enter the inner cavity 601 of the half plate 600 through the insertion tube 502, and then forms an air knife from the air outlet 604 to further cut the residual foam; the sealing strip in the pressure groove 601a keeps the inner cavity 601 sealed. S6. If the distance between the defoaming paddle 500 and the tank wall needs to be adjusted during operation: Loosen the locking nuts on the first threaded shaft 301b, the second threaded shaft 301c, the third threaded shaft 302b, and the fourth threaded shaft 302c; move the trapezoidal pressure block 703 so that it slides relative to the vertical axis 705 along the long groove 703a; the first connecting rod 301 and the second connecting rod 302 slide relative to each other in the first straight groove 301a and the second straight groove 302a; the total length of the connecting crossbar 300 changes accordingly; the first magnetic pole 704a and the second magnetic pole 703b attract each other; temporarily fix the trapezoidal pressure block 703; retighten the locking nuts on each threaded shaft to complete the length locking and keep the defoaming paddle 500 in the optimal radial position.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] 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 foregoing embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit 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 present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fermenter with adjustable airflow defoaming, characterized in that, include: The tank (100) has an adjustable flow defoaming air inlet valve (102) on its top wall, a first hanging ear (103) vertically on its side wall, and a rotating shaft (101) driven by a driving device vertically inside it. The first fixing member (200) is coaxially fixed to the outer periphery of the rotating shaft (101), and has an annular sealed first annular cavity (202) inside, and a second hanging ear (201) on its outer peripheral wall; the first annular cavity (202) is connected to the defoaming air inlet valve (102) through a connecting pipe (105) passing through the tank wall; The connecting crossbar (300) is hinged at both ends to the first hanging ear (103) and the second hanging ear (201) respectively, for supporting the first fixing member (200) inside the tank body (100) and allowing the rotating shaft (101) to drive the first fixing member (200) to rotate synchronously; The second fixing member (400) is located below the first fixing member (200) and is coaxially fixed to the outer periphery of the rotating shaft (101). It has an annular sealed second annular cavity (401) inside, and at least two radially extending defoaming paddles (500) are fixed to its outer peripheral wall. The airflow channel is composed of an air groove (101a) located at the center of the rotating shaft (101) and extending along the axial direction. The upper end of the air groove (101a) is connected to the first annular cavity (202), and the lower end is connected to the second annular cavity (401). A capacitive level gauge (104) is fixed to the inner wall of the tank (100) and located above the defoaming paddle (500).

2. The fermenter with adjustable airflow defoaming according to claim 1, characterized in that: The defoaming paddle (500) is provided with a tube groove (501), which is connected to the second annular cavity (401). Multiple insertion tubes (502) are provided under the defoaming paddle (500), and an annular plate (503) is provided on the outside of the insertion tubes (502).

3. The fermenter with adjustable airflow defoaming according to claim 2, characterized in that: Below the defoaming paddle (500) is an air knife device, which includes two half plates (600). The half plates (600) have an inner cavity (601). One end of the inner cavity (601) has a through groove (602). The through groove (602) has an annular groove (603). The insertion tube (502) is embedded in the through groove (602), and the annular plate (503) is embedded in the annular groove (603).

4. The fermenter with adjustable airflow defoaming according to claim 3, characterized in that: The inner cavity (601) has a pressure groove (601a) on its side wall, a sealing strip is provided in the pressure groove (601a), and an air vent (604) is provided in the inner cavity (601).

5. The fermenter with adjustable airflow defoaming according to claim 4, characterized in that: The connecting crossbar (300) includes a first connecting rod (301) and a second connecting rod (302). The first connecting rod (301) is provided with a first straight groove (301a). One side of the first connecting rod (301) is provided with a first threaded shaft (301b), and the other side is provided with a second threaded shaft (301c).

6. The fermenter with adjustable airflow defoaming according to claim 5, characterized in that: The second connecting rod (302) is provided with a second straight groove (302a), and a third threaded shaft (302b) is provided on one side of the second connecting rod (302) and a fourth threaded shaft (302c) is provided on the other side. The second threaded shaft (301c) passes through the second straight groove (302a) and the fourth threaded shaft (302c) passes through the first straight groove (301a).

7. The fermenter with adjustable airflow defoaming according to claim 6, characterized in that: An adjusting component (700) is provided on the connecting crossbar (300). The adjusting component (700) includes a first sleeve plate (701) and a second sleeve plate (702). The first sleeve plate (701) is sleeved on the fourth threaded shaft (302c), and the second sleeve plate (702) is sleeved on the first threaded shaft (301b). A trapezoidal pressure block (703) is provided between the first sleeve plate (701) and the second sleeve plate (702).

8. The fermenter with adjustable airflow defoaming according to claim 7, characterized in that: The first set plate (701) and the second set plate (702) are each provided with a base plate (704), the base plate (704) is provided with a vertical shaft (705), the trapezoidal pressure block (703) is provided with a long groove (703a), and the vertical shaft (705) is embedded in the long groove (703a).

9. The fermenter with adjustable airflow defoaming according to claim 8, characterized in that: The base plate (704) is provided with a first magnetic pole (704a), and the bottom surface of the trapezoidal pressure block (703) is provided with a second magnetic pole (703b). The first magnetic pole (704a) and the second magnetic pole (703b) attract each other.

10. A method of using a fermenter with adjustable airflow defoaming, characterized in that: Applied to the adjustable airflow defoaming fermenter as described in claim 9, S1. Check that the defoaming air inlet valve (102) is closed, confirm that the connecting crossbar (300) has horizontally supported the first fixing part (200) in the tank (100), and that the second fixing part (400) and the defoaming paddle (500) are simultaneously fixed on the rotating shaft (101). Visually check that the reading of the capacitance level gauge (104) is zero. S2. Inject fermentation liquid into the tank (100) until the liquid level is close to but lower than the detection end of the capacitive level gauge (104), start the drive device, and rotate the shaft (101) to drive the first fixing part (200), the second fixing part (400) and the defoaming paddle (500) to rotate synchronously. S3. Slowly open the defoaming air inlet valve (102), and the compressed gas passes through the connecting pipe (105), the first annular cavity (202), the air groove (101a), and the second annular cavity in sequence, and is finally sprayed out from the pipe groove (501) on the liquid-facing surface of the defoaming paddle (500); S4. When the foam generated during the fermentation process rises to the detection height of the capacitive level gauge (104), the capacitive level gauge (104) outputs a signal. Based on this signal, the operator increases the opening of the defoaming air inlet valve (102) and increases the air volume, so that the foam layer is broken by the mechanical shearing of the defoaming paddle (500) and the microporous airflow. S5. Gas continues to enter the inner cavity (601) of the half plate (600) through the insertion tube (502), and then forms an air knife from the air outlet (604) to further cut the residual foam; the sealing strip in the pressure groove (601a) keeps the inner cavity (601) sealed; S6. If the distance between the defoaming paddle (500) and the tank wall needs to be adjusted during operation: Loosen the locking nuts on the first threaded shaft (301b), the second threaded shaft (301c), the third threaded shaft (302b), and the fourth threaded shaft (302c), move the trapezoidal pressure block (703) so that it slides relative to the vertical axis (705) along the long groove (703a), the first connecting rod (301) and the second connecting rod (302) slide relative to each other in the first straight groove (301a) and the second straight groove (302a), the total length of the connecting crossbar (300) changes accordingly, the first magnetic pole (704a) and the second magnetic pole (703b) attract each other, temporarily fix the trapezoidal pressure block (703), and retighten the locking nuts on each threaded shaft to complete the length locking and keep the defoaming paddle (500) in the optimal radial position.

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