A fermentation apparatus for biopesticide production

Abstract

The application discloses a fermentation device for biopesticide production and belongs to the technical field of biopesticide fermentation equipment. The fermentation device comprises a fermentation tank and a multilayer composite function disc arranged in the fermentation tank. A servo motor is arranged on the top of the fermentation tank. The servo motor drives the rotation of a rotating rod. The lower end of the rotating rod is connected with a stirring rod. The multilayer composite function disc comprises a protective cover, a centrifugal impeller disc arranged in the protective cover, a gas-liquid separation disc and a defoaming disc arranged in the protective cover from top to bottom. The three parts are fixedly connected with the rotating rod and are synchronously rotated by the same servo motor. The output end of a feeding pipe is located above the inclined surface of the protective cover. The end of an exhaust pipe is rotatably embedded in the top end of the protective cover through a sealing disc. The fermentation device can realize the mechanical defoaming of the defoaming disc, the interception and recovery of entrained liquid droplets of the gas-liquid separation disc and the forced exhaust of the centrifugal impeller disc at the same time, thereby solving the problem that the existing fermentation equipment cannot synchronously realize active defoaming, gas-liquid separation and forced exhaust.

Description

Technical Field

[0001] This invention relates to the field of biological pesticide fermentation equipment technology, and in particular to a fermentation device for the production of biological pesticides. Background Technology

[0002] In the production of biopesticides, fermentation is a crucial step in obtaining highly active bacterial strains and effective metabolites. Currently, fermentation equipment used for biopesticide production typically includes a sealed fermentation tank with an exhaust pipe at the top and a stirring device inside to promote material mixing and dissolved oxygen mass transfer. Because the fermentation medium for biopesticides is rich in foaming substances such as proteins and sugars, and because a large amount of sterile air needs to be continuously introduced during aerobic fermentation, the fermentation broth easily generates a large amount of stable foam under vigorous stirring and aeration. The accumulation of large amounts of foam not only significantly reduces the effective liquid filling coefficient of the fermentation tank, resulting in wasted effective volume, but more seriously, when the foam layer rises to the top of the tank, it can carry liquid out of the tank through the exhaust pipe, causing "liquid escape." Liquid escape not only directly results in the loss of fermentation materials and increases production costs, but the escaped liquid can also contaminate the exhaust pipe and exhaust gas treatment system, even causing blockage of the exhaust pipe and leading to abnormal pressure increases inside the tank, posing a significant production safety hazard.

[0003] To address the aforementioned foaming problem, existing fermentation equipment typically employs two approaches: First, relying on chemical defoamers. However, defoamers are mostly surfactants, and their dosage is limited. Excessive use not only increases costs but may also adversely affect strain growth and product separation and purification. Second, a passive pressure relief structure is implemented, such as the scheme disclosed in prior art CN2077603329U. This structure includes a baffle and vents inside the exhaust pipe, with a cover plate connected to the top of the exhaust pipe via a return spring. When the internal pressure is too high, the cover plate is opened to achieve passive pressure relief. However, this structure is functionally limited, only addressing passive discharge due to excessive pressure. It cannot actively intervene in or eliminate the continuously generated foam during fermentation. It cannot prevent foam from carrying away liquid and overflowing, nor can it separate and recover the discharged gas-liquid mixture, nor can it actively control the exhaust rate within the tank. Therefore, how to actively and efficiently defoam the foam generated during fermentation using the fermentation equipment's own mechanical structure while stirring is in progress, and simultaneously perform gas-liquid separation and forced exhaust of the discharged gas, is a pressing technical problem to be solved in this field. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0006] Therefore, the technical problem to be solved by the present invention is: how to actively defoam the foam generated by fermentation, separate the gas and liquid of the discharged gas and achieve forced exhaust while the stirring shaft is rotating.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a fermentation device for the production of biopesticides, comprising: A fermenter, wherein a servo motor is fixedly installed on the outer top wall of the fermenter, and the output end of the servo motor is connected to a rotating rod via a coupling. The bottom end of the rotating rod penetrates the outer top wall of the fermenter and extends into it, where a stirring rod is fixedly connected; and, The multi-layer composite functional disk includes a protective cover fixedly installed on the outer surface of the rotating rod and located on the upper side inside the fermenter. The inside of the protective cover is arranged from top to bottom as a centrifugal impeller disk, a gas-liquid separation disk, and a defoaming disk, and the centrifugal impeller disk, the gas-liquid separation disk, and the defoaming disk are all fixedly connected to the outer surface of the rotating rod.

[0008] As a preferred embodiment of the fermentation apparatus for the production of biological pesticides according to the present invention, wherein: a feed pipe is installed on the left side of the top of the fermentation tank, a discharge pipe is installed at the center of the bottom of the fermentation tank, and an exhaust pipe is installed on the right side of the top of the fermentation tank.

[0009] As a preferred embodiment of the fermentation apparatus for producing biological pesticides according to the present invention, the protective cover is in the shape of a frustum with a smaller top and a larger bottom. The output end of the feed pipe extends downward into the interior of the fermentation tank, and the lower port of the output end of the feed pipe is located directly above the outer inclined surface of the protective cover. An annular gap is left between the outer wall of the protective cover and the inner wall of the fermentation tank. The material input by the feed pipe is guided by the outer inclined surface of the protective cover, passes through the annular gap, and falls into the bottom of the inner cavity of the fermentation tank.

[0010] As a preferred embodiment of the fermentation apparatus for producing biological pesticides according to the present invention, the top end face of the protective cover is provided with a circular groove, and the bottom wall of the circular groove is provided with a plurality of circumferentially distributed exhaust grooves. The bottom end of the exhaust groove is connected to the internal space of the protective cover. The air inlet end of the exhaust pipe extends downward into the interior of the fermentation tank and is fixedly connected to a sealing plate. The sealing plate is rotatably embedded in the circular groove. The air inlet of the exhaust pipe is connected to the internal space of the protective cover through the exhaust groove.

[0011] As a preferred embodiment of the fermentation apparatus for producing biological pesticides according to the present invention, wherein: the centrifugal impeller includes a disc body fixedly installed on the outer surface of the rotating rod, and a plurality of arc-shaped centrifugal blades are arranged in a circumferential array on the outer surface of the disc body.

[0012] In a preferred embodiment of the fermentation apparatus for producing biological pesticides according to the present invention, the gas-liquid separation disc includes a disc fixedly installed on the outer surface of the rotating rod. A shallow conical groove is formed on the upper surface of the disc, and multiple concentric annular baffles are arranged within the shallow conical groove. The centers of the multiple concentric annular baffles are all located on the axis of the rotating rod, and the height of the multiple concentric annular baffles increases progressively from the inner ring to the outer ring. Flow gaps are alternately formed on adjacent concentric annular baffles. Multiple first vent holes are evenly distributed circumferentially at the center of the disc, and an annular groove is formed on the outer edge of the disc, communicating with the shallow conical groove.

[0013] As a preferred embodiment of the fermentation apparatus for producing biological insecticides according to the present invention, the defoaming plate includes a frustum fixedly installed on the outer surface of the rotating rod. Multiple sets of saw teeth and multiple sets of breaking needle clusters are fixedly installed on the lower surface of the frustum. The multiple sets of saw teeth are arranged radially along the lower surface of the frustum and are evenly distributed circumferentially. The breaking needle clusters are disposed between two adjacent rows of saw teeth and are evenly distributed circumferentially and staggered with the saw teeth. Multiple second ventilation holes evenly distributed circumferentially are opened at the center of the frustum.

[0014] The beneficial effects of this invention are: 1. This invention integrates a defoaming disc, a gas-liquid separation disc, and a centrifugal impeller disc onto a single rotating rod and is driven by the same servo motor. This achieves simultaneous mechanical defoaming, gas-liquid separation, and forced exhaust while simultaneously stirring the material. Compared to existing technologies, this invention significantly reduces the number of power sources and tank openings, resulting in a more compact structure, lower manufacturing costs and operating energy consumption, and also reducing the risk of microbial contamination. Specifically, the defoaming disc uses serrated edges and breaking needle clusters to perform two-stage purely mechanical foam breaking, completely replacing chemical defoamers and avoiding their adverse effects on bacterial growth and product purification. The gas-liquid separation disc uses concentric annular baffles and intersecting flow gaps to repeatedly deflect airflow, efficiently intercepting and recirculating entrained droplets. The centrifugal impeller disc actively forces clean gas out, eliminating foam escape and significantly improving the safety and stability of the fermentation process.

[0015] 2. This invention uses a frustum-shaped protective cover to guide and centrifugally distribute the feed, allowing the material to slide down the inclined surface and fall evenly into the bottom of the tank through the annular gap between the protective cover and the tank wall, thus avoiding feed splashing and excessively high local concentrations. At the same time, the rotating fit between the circular groove at the top of the protective cover and the sealing disc at the end of the exhaust pipe ensures the sealed connection of the exhaust channel while providing radial limiting and rotational support for the multi-layer composite functional disc assembly. This improves the operational stability and concentricity of the entire disc assembly under high-speed rotation of the rotating rod, extending the service life of the equipment. It is especially suitable for the large-scale industrial production of fermentation systems for easily foaming, high-viscosity biological insecticides such as Bacillus thuringiensis, Beauveria bassiana, and Metarhizium anisopliae. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a perspective view of the overall structure of the present invention; Figure 2 This is a three-dimensional orthographic sectional view of the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 This is a three-dimensional front sectional view of the multi-layer composite functional disk of the present invention; Figure 5 This is a perspective view of the defoaming disc of the present invention. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0020] Example Referring to the figures, the present invention provides a fermentation apparatus for the production of biopesticides. The fermentation apparatus mainly includes a fermenter 100 and a multi-layer composite functional disk 200 disposed inside the fermenter 100. The fermenter 100 serves as the main container for biopesticide fermentation, carrying the fermentation materials and providing a sealed, sterile fermentation environment. A servo motor 101 is fixedly installed on the outer top wall of the fermenter 100, serving as the sole power source for the entire apparatus. Its output end is connected to a rotating rod 102 via a coupling. The bottom end of the rotating rod 102 penetrates the outer top wall of the fermenter 100 and extends into its interior, where a stirring rod 103 is fixedly connected. The stirring rod 103 is located in the lower part of the inner cavity of the fermenter 100 and is used to stir and mix the fermentation liquid to ensure that the fermentation materials remain uniformly dispersed during fermentation and to improve dissolved oxygen mass transfer efficiency.

[0021] A feed pipe 104 is installed on the left side of the top of the fermenter 100 for feeding culture medium, inoculum and various raw and auxiliary materials required for production into the fermenter 100. A discharge pipe 105 is installed at the center of the bottom of the fermenter 100 for discharging the mature fermentation liquid (containing the target insecticidal active ingredient) out of the tank after fermentation. An exhaust pipe 106 is installed on the right side of the top of the fermenter 100 for discharging the metabolic waste gas (mainly carbon dioxide) generated during fermentation out of the tank and maintaining stable gas pressure inside the tank.

[0022] The upper side of the inside of the fermenter 100 is provided with a multi-layer composite functional disk 200. The multi-layer composite functional disk 200 includes a protective cover 201 in the shape of a frustum with a smaller upper part and a larger lower part. The protective cover 201 is fixedly installed on the outer surface of the rotating rod 102 and rotates synchronously with the rotating rod 102. It is used to isolate the gas phase space above the fermentation liquid surface from the feeding area, and at the same time plays a role in collecting and guiding the rising foam and airflow. It is worth noting that the output end of the feed pipe 104 extends downward into the interior of the fermenter 100, and the lower port of the output end of the feed pipe 104 is located directly above the outer slope of the protective cover 201. There is an annular gap between the outer wall of the protective cover 201 and the inner wall of the fermenter 100. In actual operation, the material input by the feed pipe 104 first falls on the outer slope of the protective cover 201, slides down along the slope, then passes through the annular gap between the outer wall of the protective cover 201 and the inner wall of the fermenter 100, and finally falls into the bottom of the inner cavity of the fermenter 100. This design can not only avoid the material from falling directly onto the high-speed rotating rod 102 and stirring rod 103 and causing splashing, but also use the centrifugal force of the rotation of the protective cover 201 to evenly distribute the material to the periphery of the tank, achieving initial dispersion during feeding.

[0023] A circular groove 201a is provided on the top end face of the protective cover 201. Multiple venting grooves 201b are provided on the bottom wall of the circular groove 201a, which are evenly distributed in the circumferential direction. The bottom end of the venting groove 201b is connected to the internal space of the protective cover 201. The air inlet of the exhaust pipe 106 extends downward into the interior of the fermentation tank 100 and is fixedly connected to a sealing plate 107. The sealing plate 107 is rotatably embedded in the circular groove 201a. The air inlet of the exhaust pipe 106 is connected to the internal space of the protective cover 201 through the venting groove 201b. During operation, the sealing disc 107 remains stationary (because it is fixedly connected to the exhaust pipe 106), while the protective cover 201 rotates with the rotating rod 102. The inner wall of the circular groove 201a and the outer wall of the sealing disc 107 form a dynamic sealing fit, which ensures that the gas can enter the exhaust pipe 106 from the inside of the protective cover 201 through the exhaust groove 201b and the sealing disc 107 and be discharged. It also effectively prevents the gas in the tank from leaking from this fit. At the same time, the sealing disc 107 plays a role in radial limiting and rotational support for the protective cover 201, which improves the operational stability of the rotating rod 102 when it rotates at high speed.

[0024] The protective cover 201 has a centrifugal impeller disk 202, a gas-liquid separation disk 203 and a defoaming disk 204 arranged sequentially from top to bottom inside. The centrifugal impeller disk 202, the gas-liquid separation disk 203 and the defoaming disk 204 are all fixedly connected to the outer surface of the rotating rod 102. The three rotate synchronously with the rotating rod 102 to form a three-stage series processing composite functional disk group.

[0025] During operation, the foam continuously generated on the fermentation liquid surface first contacts the defoaming plate 204 located at the bottom as it rises. The defoaming plate 204 includes a frustum 204a fixedly installed on the outer surface of the rotating rod 102. The frustum 204a rotates at high speed with the rotating rod 102. Multiple circumferentially distributed second vent holes 204d are opened at the center of the frustum 204a to allow the gas released after defoaming to flow upward. Multiple sets of serrations 204b and multiple sets of breaking needle clusters 204c are fixedly installed on the lower surface of the frustum 204a. The multiple sets of serrations 204b are arranged radially along the lower surface of the frustum 204a (i.e., each set of serrations extends radially from the central area of ​​the frustum to the outer edge), and the multiple sets of serrations 204b are evenly distributed circumferentially. The breaking needle clusters 204c are arranged between two adjacent rows of serrations 204b, and the multiple sets of breaking needle clusters 204c are evenly distributed circumferentially and staggered with the serrations 204b in the circumferential direction. When the rising foam comes into contact with the high-speed rotating saw teeth 204b, the saw teeth 204b apply a shearing action to the foam, cutting large bubbles into smaller bubbles and causing them to burst, releasing the entrained gas. The tiny bubbles that are not completely cut by the saw teeth continue to rise and come into contact with the breaking needle clusters 204c. The fine needle clusters puncture the tiny bubbles, achieving secondary bubble bursting. The radial arrangement of the saw teeth 204b causes the broken liquid to be thrown radially outwards under centrifugal force to the inner wall of the fermenter 100, and then flows downwards along the tank wall back into the fermentation liquid, effectively preventing the broken liquid from being re-entrained by the rising airflow.

[0026] After being processed by the defoaming plate 204, most of the foam has been broken up, but the rising airflow inevitably still carries a small amount of tiny droplets (aerosols). These airflows carrying tiny droplets enter the gas-liquid separation plate 203 located in the middle layer. The gas-liquid separation plate 203 includes a disc 203a fixedly installed on the outer surface of the rotating rod 102. The center of the disc 203a has a plurality of first vent holes 203d evenly distributed in the circumferential direction. The rising airflow enters the upper surface area of ​​the disc 203a through the first vent holes 203d. The upper surface of the disc 203a is provided with a shallow conical groove 203b (i.e., an annular concave surface that gradually slopes upward from the center to the outer edge). Multiple concentric annular baffles 203c are provided in the shallow conical groove 203b. The centers of the multiple concentric annular baffles 203c are all located on the axis of the rotating rod 102, and the height of the multiple concentric annular baffles 203c increases from the inner ring to the outer ring. The upper and lower parts of the concentric annular baffles 203c of adjacent rings are staggered with flow gaps. That is, the bottom of one ring of baffles is provided with a flow gap, and the top of the adjacent ring of baffles is provided with a flow gap. The flow gaps between adjacent rings are staggered in the circumferential direction. When the droplet-containing airflow enters the shallow conical groove 203b, it flows radially outward in the annular channel between two adjacent baffles. Because the flow gaps are staggered in both the height and circumferential directions, the airflow is forced to repeatedly change its flow direction as it passes through each baffle, forming an S-shaped flow path that zigs back and forth. The tiny droplets entrained in the airflow cannot change direction synchronously with the airflow due to inertia, and thus continuously collide with the baffle wall, condensing into larger droplets. Under the centrifugal force and the guiding effect of the inclined surface of the shallow conical groove 203b itself, the condensed droplets flow radially outward to the outer edge of the disk 203a. The outer edge of the disc 203a is provided with an annular groove 203e, which is connected to the shallow conical groove 203b. The condensed droplets are collected in the annular groove 203e and then discharged downward from the bottom of the annular groove 203e through the reflux hole (not shown in the figure), falling back to the area of ​​the lower defoaming disc 204 and finally flowing back into the fermentation liquid along the tank wall, thus achieving efficient gas-liquid separation.

[0027] The gas, after being processed by the gas-liquid separation disc 203, is essentially free of liquid droplets and becomes clean gas. This clean gas rises into the uppermost centrifugal impeller disc 202. The centrifugal impeller disc 202 includes a disc body 202a fixedly mounted on the outer surface of the rotating rod 102. Multiple arc-shaped centrifugal blades 202b are arranged in a circumferential array on the outer surface of the disc body 202a. When the disc body 202a rotates at high speed with the rotating rod 102, the arc-shaped centrifugal blades 202b rotate synchronously, generating centrifugal pressurization on the incoming gas. This accelerates the gas from the central area of ​​the disc body and throws it towards the outer edge of the disc body, creating a certain negative pressure in the central area of ​​the disc body. This actively draws in and pumps out the clean gas below, which has undergone defoaming and gas-liquid separation treatment. The gas, pressurized by the centrifugal impeller disc 202, rises into the gas collection area between the top of the protective cover 201 and the sealing disc 107. Subsequently, it passes through the exhaust groove 201b on the bottom wall of the circular groove 201a, the sealing disc 107, and then into the exhaust pipe 106, finally being discharged outside the tank. By adjusting the speed of the servo motor 101, the exhaust flow and exhaust pressure of the centrifugal impeller disk 202 can be controlled, so that the fermenter 100 is kept in a slightly negative pressure state. On the one hand, the large amount of metabolic waste gas (CO2) generated by aerobic fermentation is actively extracted to promote the growth and metabolism of aerobic bacteria. On the other hand, the gas pressure inside the tank is lower than the external gas pressure, which fundamentally eliminates the possibility of foam carrying liquid overflowing from the exhaust pipe, and realizes safe, active and controllable forced exhaust.

[0028] In summary, the fermentation device for biopesticide production provided in this embodiment achieves four functions—stirring material (stirring rod 103), eliminating foam (defoaming disk 204), gas-liquid separation (gas-liquid separation disk 203), and forced exhaust (centrifugal impeller disk 202)—synchronously driven by the same power source by coaxially linking the stirring rod 103 driven by the servo motor 101 with the multi-layer composite functional disk 200. This eliminates the need for additional power devices, resulting in a compact structure and reliable operation. It is particularly suitable for the fermentation needs of easily foaming and high-viscosity fermentation systems in biopesticide production processes.

[0029] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0030] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0031] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0032] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A fermentation apparatus for the production of biological pesticides, characterized in that: include, A fermenter (100) has a servo motor (101) fixedly installed on its outer top wall. The output end of the servo motor (101) is connected to a rotating rod (102) via a coupling. The bottom end of the rotating rod (102) penetrates the outer top wall of the fermenter (100) and extends into its interior, where a stirring rod (103) is fixedly connected. The multi-layer composite functional disk (200) includes a protective cover (201) fixedly installed on the outer surface of the rotating rod (102) and located on the upper side inside the fermenter (100). The protective cover (201) is provided with a centrifugal impeller disk (202), a gas-liquid separation disk (203) and a defoaming disk (204) from top to bottom inside. The centrifugal impeller disk (202), the gas-liquid separation disk (203) and the defoaming disk (204) are all fixedly connected to the outer surface of the rotating rod (102).

2. The fermentation apparatus for producing biopesticides as described in claim 1, characterized in that: A feed pipe (104) is installed on the left side of the top of the fermentation tank (100), a discharge pipe (105) is installed at the center of the bottom of the fermentation tank (100), and an exhaust pipe (106) is installed on the right side of the top of the fermentation tank (100).

3. The fermentation apparatus for producing biopesticides as described in claim 2, characterized in that: The protective cover (201) is shaped like a frustum with a smaller top and a larger bottom. The output end of the feed pipe (104) extends downward into the interior of the fermenter (100), and the lower port of the output end of the feed pipe (104) is located directly above the outer inclined surface of the protective cover (201). There is an annular gap between the outer wall of the protective cover (201) and the inner wall of the fermenter (100). The material input by the feed pipe (104) is guided by the outer inclined surface of the protective cover (201), passes through the annular gap, and falls into the bottom of the inner cavity of the fermenter (100).

4. The fermentation apparatus for producing biopesticides as described in claim 3, characterized in that: The top end face of the protective cover (201) is provided with a circular groove (201a), and a plurality of circumferentially distributed exhaust grooves (201b) are provided on the bottom wall of the circular groove (201a). The bottom end of the exhaust groove (201b) is connected to the internal space of the protective cover (201). The air inlet of the exhaust pipe (106) extends downward to the inside of the fermentation tank (100) and is fixedly connected to a sealing plate (107). The sealing plate (107) is rotatably embedded in the circular groove (201a). The air inlet of the exhaust pipe (106) is connected to the internal space of the protective cover (201) through the exhaust groove (201b).

5. The fermentation apparatus for producing biopesticides as described in claim 4, characterized in that: The centrifugal impeller disk (202) includes a disk body (202a) fixedly installed on the outer surface of the rotating rod (102), and a plurality of arc-shaped centrifugal blades (202b) are installed in a circumferential array on the outer surface of the disk body (202a).

6. The fermentation apparatus for producing biopesticides as described in claim 5, characterized in that: The gas-liquid separation disk (203) includes a disk (203a) fixedly installed on the outer surface of the rotating rod (102). A shallow conical groove (203b) is provided on the upper surface of the disk (203a). A plurality of concentric annular baffles (203c) are provided in the shallow conical groove (203b). The centers of the plurality of concentric annular baffles (203c) are all located on the axis of the rotating rod (102), and the height of the plurality of concentric annular baffles (203c) increases from the inner circle to the outer circle. The concentric annular baffles (203c) of adjacent circles are staggered with flow gaps at the top and bottom. A plurality of first vent holes (203d) are provided at the center of the disk (203a) and are evenly distributed in the circumference. An annular groove (203e) is provided on the outer edge of the disk (203a) and is connected to the shallow conical groove (203b).

7. The fermentation apparatus for producing biopesticides as described in claim 6, characterized in that: The defoaming plate (204) includes a frustum (204a) fixedly installed on the outer surface of the rotating rod (102). Multiple sets of saw teeth (204b) and multiple sets of breaking needle clusters (204c) are fixedly installed on the lower surface of the frustum (204a). The multiple sets of saw teeth (204b) are arranged radially along the lower surface of the frustum (204a) and are evenly distributed circumferentially. The breaking needle clusters (204c) are arranged between two adjacent rows of saw teeth (204b) and are evenly distributed circumferentially and staggered with the saw teeth (204b). Multiple second vent holes (204d) are evenly distributed circumferentially at the center of the frustum (204a).

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