A multi-stage fermentation broth filtering device

Abstract

The present application relates to fermentation broth filtration technical field, specifically, it relates to a kind of fermentation broth multistage filtration equipment.Its equipment body has filter barrel and delivery pipe, filter barrel is composed of upper movable pipe, middle pipe and bottom bucket, inlet mechanism is arranged in upper movable pipe, filter assembly includes secondary filtration mechanism and last filtration mechanism, secondary filtration mechanism and inlet mechanism and last filtration mechanism are all connected by delivery cavity.The application realizes the communication of inlet mechanism and secondary filtration mechanism by delivery cavity, so that fermentation broth enters secondary filtration mechanism and carries out centrifugal filtration, and the stable pressure delivery is reduced to the physical damage of bacteria and other substances, while the delivery cavity can carry out primary adsorption filtration to fermentation broth, and secondary filtration mechanism and last filtration mechanism are connected again through delivery cavity, so that fermentation broth after secondary centrifugal filtration can be sent to sedimentation cavity for three-stage sedimentation filtration without affecting last sedimentation filtration, and layer-by-layer progression ensures more thorough filtration of fermentation broth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fermentation broth filtration, in particular to a fermentation broth multi-stage filtration equipment. BACKGROUND

[0002] L-theanine is a characteristic amino acid in tea, accounting for more than 40% of its total free amino acids. Due to its multiple health benefits, such as lowering blood pressure and preventing vascular diseases, L-theanine has been commercially developed as a valuable ingredient and widely used in the food, pharmaceutical, health care, and cosmetic industries.

[0003] Currently, L-theanine is mainly produced by enzyme catalysis, whole-cell catalysis, and fed-batch ethylamine fermentation. However, enzyme catalysis has several issues, such as complex catalytic system, expensive substrate, and the need for separate enzyme preparation and reaction steps, which results in high production costs and is not suitable for large-scale industrial production. In contrast to enzyme catalysis, microbial fermentation has the advantages of simple process, low cost of raw materials, and low equipment occupancy, and has been widely used in the industrial production of L-theanine.

[0004] Microbial fermentation requires filtering of the fermentation broth after fermentation to remove the bacterial cells, residual components of the culture medium, and metabolic products. A multi-stage fermentation broth filtration device (CN218589931U) has a detachable screen inside the outer cylinder, a rotating inner cylinder below, a leakage hole in the inner cylinder, and a slag discharge pipe connected to the lower end of the inner cylinder. The device achieves multi-stage filtration through the screen and leakage hole, and centrifugal separation of the fermentation broth by rotating the inner cylinder. The stirring roller and stirring blades prevent the filter residue from sticking and accumulating, improving the separation effect. The threaded cap, rubber plug, and slag discharge pipe facilitate the discharge of filter residue.

[0005] However, the microbial fermentation broth obtained during the production of L-theanine contains elastic and compressible components such as bacterial cells, which means that these components will deform when subjected to external forces. If the fermentation broth is directly poured into the filtration device and the transmission assembly is started to stir the fermentation broth, a large mechanical force will be generated during stirring, which can easily cause the bacterial cells and other components to break apart. Once the bacterial cells are broken, their physical structure is destroyed, causing the size of the bacterial cells to decrease, making them more likely to pass through the filter screen along with L-theanine, greatly reducing the filtration efficiency.

[0006] In view of the above problems, we propose a fermentation broth multi-stage filtration equipment. SUMMARY

[0007] The present application aims to provide a fermentation broth multi-stage filtration equipment to solve the problems mentioned in the background.

[0008] In order to achieve the above object, the present application aims to provide a fermentation liquid multi-stage filtering device, comprising a device body, the device body comprising a filtering barrel and a conveying pipe, the filtering barrel comprising an upper movable pipe, a middle pipe and a bottom barrel, an inner part of the upper movable pipe is provided with a feeding mechanism, a top end of the feeding mechanism is communicated with the conveying pipe, and the device body is installed on a surface of a bottom plate;

[0009] The middle pipe and the bottom barrel are sealingly and movably connected, an inner part of the middle pipe is provided with a filtering assembly, the filtering assembly comprising a secondary filtering mechanism and a last filtering mechanism, the secondary filtering mechanism is located in the inner part of the middle pipe, and the last filtering mechanism is located in the inner part of the bottom barrel;

[0010] The secondary filtering mechanism is located between the feeding mechanism and the last filtering mechanism, and the secondary filtering mechanism is connected with the feeding mechanism and the last filtering mechanism through conveying cavities, the conveying cavity communicated with the feeding mechanism is used for conveying the fermentation liquid to the inner part of the secondary filtering mechanism in a stable pressure state, and meanwhile, the conveying cavity can also perform primary filtering on the fermentation liquid, and the conveying cavity communicated with the last filtering mechanism can assist in conveying the fermentation liquid to the last filtering mechanism without affecting the last sedimentation filtering.

[0011] As a further improvement of the technical solution, the feeding mechanism comprises a movable cover installed at a top end of the upper movable pipe, an inner part of the movable cover is installed with a feeding pipe, the feeding pipe is connected with the conveying pipe, an inner part of the upper movable pipe is provided with a circular table, the circular table is connected with an inner wall of the upper movable pipe through a fixed block, the conveying cavity is composed of an upper cavity and a lower cavity, the upper cavity is located between the circular table and the upper movable pipe, and an inner wall of the upper cavity is paved with an inner membrane.

[0012] As a further improvement of the technical solution, the secondary filtering mechanism comprises a filter cartridge movably connected in the inner part of the middle pipe, a middle hole is formed between the middle pipe and the upper movable pipe, a top part of the filter cartridge is connected with a driving piece, an inner part of the filter cartridge forms a filter cavity, and a bottom end of the upper cavity is communicated with an opening of the filter cavity.

[0013] As a further improvement of the technical solution, the driving piece comprises a gear plate connected with an outer wall of a top end of the filter cartridge, the gear plate passes through the middle hole and extends out of a surface of the middle pipe, an outer wall of the middle pipe is fixedly connected with a fixed plate, a top part of the fixed plate is rotatably connected with a driving gear, a lower end of the fixed plate is fixedly connected with a driving motor, an output shaft of the driving motor is fixedly connected with a rotating shaft of the driving gear, and the driving gear is meshingly connected with the gear plate.

[0014] As a further improvement of the technical solution, the last filtering mechanism comprises a sedimentation cavity located inside the bottom bucket, the lower cavity is located between the filter cartridge and the middle tube, the lower end opening of the lower cavity is communicated with the sedimentation cavity, and the upper end surface of the bottom bucket is provided with an output hole, and a sealing cover is sealingly installed in the inside of the output hole.

[0015] As a further improvement of the technical solution, the middle end surface of the bottom bucket is provided with an observation window, and a transparent glass is sealingly installed in the inside of the observation window.

[0016] As a further improvement of the technical solution, the inner cavity bottom of the filter cartridge is fixedly installed with a middle boss, and the middle boss is used to guide the fermentation broth inside the filter cartridge to the inner wall of the filter cartridge.

[0017] As a further improvement of the technical solution, the lower end outer wall of the circular table is fixedly installed with a first drainage leaf, and the lower end outer wall of the filter cartridge is fixedly connected with a second drainage leaf, the first drainage leaf is located at the inner cavity bottom of the upper cavity, and the second drainage leaf is located at the inner cavity bottom of the lower cavity.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] In the fermentation broth multi-stage filtering equipment, the feeding mechanism and the secondary filtering mechanism are communicated through the conveying cavity. When the fermentation broth enters the secondary filtering mechanism for centrifugal filtration from the feeding mechanism, stable conveying can be realized. This stable conveying mode can effectively reduce the physical damage to the bacteria and other substances in the fermentation broth during the conveying process, thereby maintaining the integrity of the bacteria and other components to the greatest extent. In addition, the conveying cavity between the feeding mechanism and the secondary filtering mechanism can also perform primary adsorption filtration on the fermentation broth, thereby further enhancing the filtering effect.

[0020] The secondary filtering mechanism and the last filtering mechanism are connected again through the conveying cavity. Under the premise of not affecting the fermentation broth filtration that is being subjected to the last sedimentation, the fermentation broth subjected to the secondary centrifugal filtration can be stably conveyed into the sedimentation cavity for third-stage sedimentation filtration. This layer-by-layer progressive filtering mode ensures that the fermentation broth can be subjected to more thorough filtration, and the existing filtration process is not damaged. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0022] Figure 2 It is a schematic diagram of the exploded structure of the filtering barrel of the present application;

[0023] Figure 3 It is a schematic diagram of the structure of A of the present application; Figure 2

[0024] Figure 4 It is a schematic diagram of the cross-sectional structure of the filtering barrel of the present application;​

[0025] Figure 5 This is a schematic diagram showing the flow state of the fermentation broth inside the filter tank of the present invention.

[0026] Figure 6 This is a schematic diagram of the feeding mechanism of the present invention;

[0027] Figure 7 For the present invention Figure 4 A schematic diagram of the structure at point B;

[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of the middle tube of the present invention;

[0029] Figure 9 This is a schematic diagram of the bottom bucket structure of the present invention.

[0030] The meanings of the labels in the diagram are as follows:

[0031] 1. Equipment body; 11. Filter tank; 12. Conveying pipe; 111. Upper movable pipe; 112. Middle pipe; 113. Bottom tank; 13. Bottom plate;

[0032] 2. Feeding mechanism; 21. Movable cover; 22. Feeding pipe; 23. Frustum; 24. Inner membrane;

[0033] 3. Filter assembly; 31. Secondary filtration mechanism; 32. Final filtration mechanism;

[0034] 311. Driving component; 312. Filter cartridge; 313. Filter chamber; 3101. Central hole; 3102. Gear plate; 3103. Drive gear; 3104. Fixing plate; 3105. Drive motor;

[0035] 321. Sedimentation chamber; 322. Output port; 323. Sealing cover;

[0036] 4. Central boss;

[0037] 5. First referral page; 51. Second referral page;

[0038] 6. Observation window;

[0039] 7. Delivery chamber; 71. Upper chamber; 72. Lower chamber. Detailed Implementation

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Embodiment, please refer to Figure 1 and Figure 2 As shown in the figure, the embodiment is aimed at providing a fermentation liquid multi-stage filtering equipment, which comprises an equipment body 1, the equipment body 1 comprises a filtering barrel 11 and a conveying pipe 12, the filtering barrel 11 comprises an upper movable pipe 111, a middle pipe 112 and a bottom barrel 113, the inside of the upper movable pipe 111 is provided with a feeding mechanism 2, the top end of the feeding mechanism 2 is communicated with the conveying pipe 12, the equipment body 1 is installed on the surface of a bottom plate 13, the middle pipe 112 and the bottom barrel 113 are sealingly and movably connected, the inside of the middle pipe 112 is provided with a filtering assembly 3, the filtering assembly 3 comprises a secondary filtering mechanism 31 and a final filtering mechanism 32, the secondary filtering mechanism 31 is located in the inside of the middle pipe 112, the final filtering mechanism 32 is located in the inside of the bottom barrel 113, the secondary filtering mechanism 31 is located between the feeding mechanism 2 and the final filtering mechanism 32, the secondary filtering mechanism 31 is connected with the feeding mechanism 2 and the final filtering mechanism 32 through a conveying cavity 7, the conveying cavity 7 communicated with the feeding mechanism 2 is used for conveying the fermentation liquid into the inside of the secondary filtering mechanism 31 in a stable pressure state, at the same time, the conveying cavity 7 can also perform primary filtering on the fermentation liquid, the conveying cavity 7 communicated with the final filtering mechanism 32 can assist the fermentation liquid to be conveyed into the final filtering mechanism 32 without affecting the final sedimentation filtering, wherein, the upper movable pipe 111 is installed on the surface of the bottom plate 13 through a fixing ring, the middle pipe 112 and the bottom barrel 113 are sealingly connected through bolts, the bottom of the bottom barrel 113 is installed on the surface of the bottom plate 13 through a support rod.

[0042] When filtering the fermentation liquid after fermentation, the fermentation liquid needs to be conveyed into the inside of the equipment body 1 through the feeding mechanism 2 first, the specific structure of the feeding mechanism 2 is disclosed as follows, the feeding mechanism 2 comprises a movable cover 21 installed on the top end of the upper movable pipe 111, the inside of the movable cover 21 is installed with a feeding pipe 22, the feeding pipe 22 is connected with the conveying pipe 12, the inside of the upper movable pipe 111 is provided with a circular table 23, the circular table 23 is connected with the inner wall of the upper movable pipe 111 through a fixing block, the conveying cavity 7 is composed of an upper cavity 71 and a lower cavity 72, the upper cavity 71 is located between the circular table 23 and the upper movable pipe 111, the inner wall of the upper cavity 71 is paved with an inner membrane 24.

[0043] Refer to Figure 5 and in combination with Figure 6 It can be seen that the feeding pipe 22 and the conveying pipe 12 are communicated with each other, and the opening of the end of the feeding pipe 22 close to the equipment body 1 is located at the top of the circular table 23, such a design makes the fermentation liquid needing to be filtered can directly fall on the surface of the circular table 23, for example Figure 4As shown, the upper end surface of the circular table 23 has a certain slope, so that the fermentation liquid can flow into the inside of the upper cavity 71 along the outer wall of the circular table 23, and the inner wall of the upper cavity 71 is paved with an inner membrane 24 which can be made of activated carbon, macroporous adsorption resin or other adsorptive materials. When the fermentation liquid enters the upper cavity 71, it can be adsorbed and filtered. In addition, the residual culture medium in the fermentation liquid can increase the concentration of the fermentation liquid itself, and the surface of the activated carbon and macroporous adsorption resin is relatively smooth, which can reduce the influence of the concentration on the flow of the fermentation liquid and promote the stable feeding of the fermentation liquid.

[0044] The primary adsorption and filtration is not enough to completely filter the impurities in the fermentation liquid, so it is necessary to filter the fermentation liquid again by the secondary filtration mechanism 31. The specific structure of the secondary filtration mechanism 31 will be disclosed below. The secondary filtration mechanism 31 comprises a filter cartridge 312 movably connected inside the middle pipe 112, and a middle hole 3101 is formed between the middle pipe 112 and the upper movable pipe 111. The top of the filter cartridge 312 is connected with a driving member 311, and the inside of the filter cartridge 312 forms a filter cavity 313. The bottom end of the upper cavity 71 is communicated with the opening of the filter cavity 313.

[0045] Combining Figure 4 and Figure 5 It can be seen that the circular table 23 is located at the middle top end of the filter cartridge 312, and the bottom end opening of the upper cavity 71 is communicated with the filter cavity 313 inside the filter cartridge 312. As shown in Figure 6 , the upper cavity 71 is relatively narrow, and the lower end opening thereof is close to the inner wall of the filter cavity 313. In this way, the fermentation liquid flowing out of the upper cavity 71 can flow slowly along the inner wall of the filter cartridge 312 to the inner cavity of the filter cartridge 312, which enables the fermentation liquid to enter the inside of the filter cavity 313 in a very stable state, greatly reduces the physical damage of the impurities such as bacteria in the fermentation liquid during the conveying process, and helps to maintain the integrity of the impurities such as bacteria, thereby providing better basic conditions for subsequent filtration operation.

[0046] The driving member 311 comprises a gear plate 3102 connected with the upper end outer wall of the filter cartridge 312. The gear plate 3102 penetrates through the middle hole 3101 and extends out of the surface of the middle pipe 112. The outer wall of the middle pipe 112 is fixedly connected with a fixed plate 3104, the top of the fixed plate 3104 is rotatably connected with a driving gear 3103, the lower end of the fixed plate 3104 is fixedly connected with a driving motor 3105, the output shaft of the driving motor 3105 is fixedly connected with the rotating shaft of the driving gear 3103, and the driving gear 3103 is meshingly connected with the gear plate 3102.

[0047] In the process of preparing theanine by microbial fermentation, in order to ensure the filtering effect, the fermentation liquid is usually filtered in batches. When the fermentation liquid enters the inside of the filter cylinder 312 in a steady pressure state, the driving motor 3105 is started. At this time, the driving gear 3103 fixedly connected with the output shaft of the driving motor 3105 rotates. As shown in Figure 3 , the driving gear 3103 is in meshing connection with the gear plate 3102 installed on the surface of the filter cylinder 312. Therefore, when the driving gear 3103 rotates, the gear plate 3102 also rotates, thereby driving the filter cylinder 312 to rotate in the middle tube 112. In addition, the gear plate 3102 also plays a supporting role for the filter cylinder 312. With the rotation of the filter cylinder 312, the fermentation liquid in the filter cavity 313 can be subjected to centrifugal action, thereby realizing the re-filtering of the fermentation liquid. The upper and lower end surfaces of the gear plate 3102 are in abutting state with the inner wall of the middle hole 3101, and the inner wall of the middle hole 3101 is paved with a sealing strip (made of elastic rubber material).

[0048] When the fermentation liquid is subjected to centrifugal filtration in a relatively small fluctuation steady pressure state, the fermentation liquid flows stably in the steady pressure state and does not appear a large impact force and turbulent flow, thereby reducing the physical disturbance to the bacteria and other substances in the fermentation liquid, so that the physical structure of the bacteria is less affected. When subsequent centrifugal filtration is carried out, since the fermentation liquid is already in a relatively stable state, the action of the centrifugal force is relatively uniform and does not produce a violent local impact, thereby avoiding the re-damage to the physical structure of the bacteria, so that the integrity of the bacteria can be better maintained in the whole filtering process, and the effective filtration of the fermentation liquid is realized.

[0049] The filter cylinder 312 is driven to rotate by the meshing of the gear plate 3102 and the driving gear 3103. This mode is relatively stable and can weaken the influence of centrifugal shear. The transmission of gear meshing is relatively stable and does not produce a violent mutation force. While ensuring the effect of centrifugal filtration, the excessive impact force on the fermentation liquid is avoided, so that the fermentation liquid is not further damaged and the bacteria and other components in the fermentation liquid can be separated in a relatively mild filtering environment.

[0050] Centrifugal filtration is usually carried out for the bacteria and residual components of the culture medium in the fermentation liquid. However, there are also relatively small metabolic products in the fermentation liquid. Therefore, the fermentation liquid needs to be filtered again by the last filtering mechanism 32. The specific structure of the last filtering mechanism 32 will be disclosed below. The last filtering mechanism 32 comprises a sedimentation cavity 321 located in the inside of the bottom bucket 113. The lower cavity 72 is located between the filter cylinder 312 and the middle tube 112. The lower end opening of the lower cavity 72 is communicated with the sedimentation cavity 321. The upper end surface of the bottom bucket 113 is provided with an output hole 322. The inside of the output hole 322 is sealingly installed with a sealing cover 323.

[0051] As shown in Figure 5As shown, the fermented liquid filtered by the centrifugal filter is located outside the filter cartridge 312, and a lower cavity 72 is formed between the filter cartridge 312 and the middle tube 112, which can transport the filtered fermented liquid to the sedimentation cavity 321 in the bottom bucket 113 for sedimentation filtration. Since the fermented liquid is continuously filtered during the centrifugal filtration, and the lower cavity 72 is similar to the upper cavity 71 described above and is a relatively small cavity, such a design enables the fermented liquid filtered from the filter cartridge 312 to flow slowly along the inner wall of the middle tube 112 and the bottom bucket 113 to the sedimentation cavity 321. During this process, the conveying mode is extremely stable, greatly reducing the interference to the fermented liquid that has been subjected to sedimentation filtration in the sedimentation cavity 321, ensuring the continuity and stability of the sedimentation filtration process, and at the same time, enabling the fermented liquid to be filtered in a more orderly manner, greatly improving the filtration efficiency and filtration quality.

[0052] After the fermented liquid is completely sedimentation filtered, the sealing cover 323 on the upper end surface of the bottom bucket 113 is slowly opened. At this time, it can be clearly seen that the fermented liquid after sedimentation filtration presents a more pure state. Then, the fermented liquid in the sedimentation cavity 321 can be pumped out (attention should be paid to the pumping position to avoid pumping out the sediment). This operation mode is not only convenient and efficient, but also can minimize secondary pollution to the fermented liquid, ensuring that the pumped fermented liquid maintains good quality (it should be noted that since the fermentation liquid is usually filtered in batches, the total amount of fermented liquid subjected to filtration should not exceed the maximum range of the bottom bucket 113).

[0053] Since the impurity levels in different batches of fermented liquid are different, in order to more intuitively observe the filtration state of the fermented liquid, an observation window 6 is provided on the middle end surface of the bottom bucket 113, and a transparent glass is sealingly installed inside the observation window 6.

[0054] The improvement lies in that Figure 9 As shown, the observation window 6 can be used to observe the sedimentation of the fermented liquid in the sedimentation cavity 321, determine the maximum capacity of the sedimentation cavity 321, and ensure that the liquid level of the fermented liquid does not exceed the output hole 322, so as to better grasp the filtration progress and adjust the filtration operation, thereby achieving effective filtration of different batches of fermented liquid.

[0055] Considering the filtration of the fermented liquid when the amount of fermented liquid inside the filter cartridge 312 is small, a middle boss 4 is fixedly installed at the bottom of the inner cavity of the filter cartridge 312, and the middle boss 4 is used to guide the fermented liquid inside the filter cartridge 312 to the inner wall of the filter cartridge 312.

[0056] The improvement lies in that Figure 4As shown, when the fermentation broth in the filter cartridge 312 is less, the convex boss 4 can avoid the fermentation broth accumulating inside the filter cartridge 312, ensure that even in the case of a small amount of fermentation broth, the fermentation broth can flow fully and be filtered effectively, thereby improving the adaptability of the filter cartridge 312 to different fermentation broth amounts and ensuring the stability of the filtering effect.

[0057] In view of the fact that the fermentation broth is usually filtered in batches, in order to ensure that the fermentation broth can flow along the inner wall and stabilize the pressure when being delivered to the end, the lower end outer wall of the circular table 23 is fixedly provided with a first drainage leaf 5, and the lower end outer wall of the filter cartridge 312 is fixedly connected with a second drainage leaf 51, the first drainage leaf 5 is located at the bottom of the inner cavity of the upper cavity 71, and the second drainage leaf 51 is located at the bottom of the inner cavity of the lower cavity 72.

[0058] The improvement lies in that Figure 4 and Figure 7 As shown, even in the last stage of the flow of the fermentation broth, the first drainage leaf 5 can guide the fermentation broth to the inner wall of the filter cavity 313, and the second drainage leaf 51 can guide the fermentation broth to the inner wall of the bottom bucket 113, thereby stabilizing the pressure of the fermentation broth during the delivery process, reducing pressure fluctuations, making the fermentation broth be able to be filtered in a more stable state, and thereby improving the filtering effect and stability.

[0059] In summary, the working principle of the present scheme is as follows: first, the inlet pipe 22 and the delivery pipe 12 are in communication with each other, and the opening of the inlet pipe 22 near the end of the equipment body 1 is at the top of the circular table 23, which enables the fermentation broth to be filtered to directly fall on the surface of the circular table 23, the upper end surface of the circular table 23 has a certain slope, so that the fermentation broth can flow into the upper cavity 71 along the outer wall of the circular table 23, the inner wall of the upper cavity 71 is paved with an inner membrane 24, which can be made of activated carbon, macroporous adsorption resin or other adsorbent materials, and when the fermentation broth enters the upper cavity 71, it can be adsorbed and filtered;

[0060] The circular table 23 is located at the middle top end of the filter cylinder 312, and the bottom end opening of the upper cavity 71 is communicated with the filter cavity 313 inside the filter cylinder 312. The upper cavity 71 is relatively narrow, and the lower end opening thereof is close to the inner wall of the filter cavity 313. In this way, the fermented liquid flowing out of the upper cavity 71 can flow along the inner wall of the filter cylinder 312 to the inner cavity of the filter cylinder 312 slowly, which enables the fermented liquid to enter the inside of the filter cavity 313 in a very stable state, greatly reducing the physical damage of the bacteria and other impurities in the fermented liquid during the conveying process. Then, the driving motor 3105 is started, at this time, the driving gear 3103 fixedly connected with the output shaft of the driving motor 3105 rotates, the driving gear 3103 is in meshing connection with the gear plate 3102 installed on the surface of the filter cylinder 312, so when the driving gear 3103 rotates, the gear plate 3102 also rotates, thereby driving the filter cylinder 312 to rotate in the middle pipe 112. In addition, the gear plate 3102 also supports the filter cylinder 312. With the rotation of the filter cylinder 312, the fermented liquid in the filter cavity 313 is subjected to centrifugal action, thereby realizing the re-filtering of the fermented liquid. When the fermented liquid enters the filter cavity 313 in a stable pressure state with small fluctuation, the fermented liquid flows stably in the stable pressure state, without large impact force and turbulent flow, thereby reducing the physical disturbance to the bacteria and other substances in the fermented liquid, so that the physical structure of the bacteria is less affected.

[0061] The fermented liquid filtered out by the centrifugal filter is located outside the filter cylinder 312, and a lower cavity 72 is formed between the filter cylinder 312 and the middle pipe 112, which can convey the filtered fermented liquid to the sediment cavity 321 in the bottom barrel 113 for sedimentation filtering. Since the fermented liquid is continuously filtered out during the centrifugal filtering process, the lower cavity 72 is similar to the upper cavity 71 described above and is a relatively small cavity. Such a design enables the fermented liquid filtered out from the filter cylinder 312 to flow along the inner walls of the middle pipe 112 and the bottom barrel 113 to the sediment cavity 321 slowly, and in this process, the conveying mode is very stable, greatly reducing the disturbance to the fermented liquid that has been subjected to sedimentation filtering in the sediment cavity 321, thereby ensuring the continuity and stability of the sedimentation filtering process.

[0062] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-stage filtration apparatus for fermentation broth, comprising an apparatus body (1) comprising a filtration barrel (11) and a delivery pipe (12), characterized in that: The filter barrel (11) comprises an upper movable pipe (111), a middle pipe (112) and a bottom barrel (113), the inside of the upper movable pipe (111) is provided with a feeding mechanism (2), the top end of the feeding mechanism (2) is communicated with a conveying pipe (12), and the equipment body (1) is installed on the surface of a bottom plate (13); The middle pipe (112) and the bottom barrel (113) are sealingly and movably connected, the inside of the middle pipe (112) is provided with a filter assembly (3), the filter assembly (3) comprises a secondary filtering mechanism (31) and a last filtering mechanism (32), the secondary filtering mechanism (31) is located in the inside of the middle pipe (112), and the last filtering mechanism (32) is located in the inside of the bottom barrel (113); The secondary filtering mechanism (31) is located between the feeding mechanism (2) and the last filtering mechanism (32), the secondary filtering mechanism (31) is connected with the feeding mechanism (2) and the last filtering mechanism (32) through conveying cavities (7), the conveying cavity (7) communicated with the feeding mechanism (2) is used for conveying the fermentation liquor to the inside of the secondary filtering mechanism (31) in a stable pressure state, and meanwhile, the conveying cavity (7) can also perform primary filtering on the fermentation liquor; The conveying cavity (7) communicated with the last filtering mechanism (32) can assist in conveying the fermentation liquor into the last filtering mechanism (32) without affecting the last sedimentation filtering; The feeding mechanism (2) comprises a movable cover (21) installed at the top end of the upper movable pipe (111), the inside of the movable cover (21) is provided with a feeding pipe (22), the feeding pipe (22) is connected with the conveying pipe (12), the inside of the upper movable pipe (111) is provided with a circular table (23), the circular table (23) and the inner wall of the upper movable pipe (111) are connected through a fixed block, the conveying cavity (7) is composed of an upper cavity (71) and a lower cavity (72), the upper cavity (71) is located between the circular table (23) and the upper movable pipe (111), and the inner wall of the upper cavity (71) is paved with an inner membrane (24); The secondary filtering mechanism (31) comprises a filter cylinder (312) movably connected in the inside of the middle pipe (112), the middle pipe (112) and the upper movable pipe (111) are provided with a middle hole (3101), the top of the filter cylinder (312) is connected with a driving piece (311), the inside of the filter cylinder (312) forms a filter cavity (313), and the bottom end of the upper cavity (71) is communicated with the opening of the filter cavity (313). The driving member (311) comprises a gear plate (3102) connected with the upper end outer wall of the filter cartridge (312), the gear plate (3102) passes through the middle hole (3101) and extends out of the surface of the middle pipe (112), the outer wall of the middle pipe (112) is fixedly connected with a fixed plate (3104), the top of the fixed plate (3104) is rotatably connected with a driving gear (3103), the lower end of the fixed plate (3104) is fixedly connected with a driving motor (3105), the output shaft of the driving motor (3105) is fixedly connected with the rotating shaft of the driving gear (3103), and the driving gear (3103) is meshingly connected with the gear plate (3102).

2. The multi-stage filtration apparatus for fermentation broth according to claim 1, characterized in that: The last filtering mechanism (32) comprises a sedimentation cavity (321) located in the inner bottom bucket (113), the lower cavity (72) is located between the filter cartridge (312) and the middle pipe (112), the lower end opening of the lower cavity (72) is communicated with the sedimentation cavity (321), and the upper end surface of the bottom bucket (113) is provided with an output hole (322), and the inner sealing cover (323) of the output hole (322) is mounted.

3. The multi-stage filtration apparatus for fermentation broth according to claim 2, characterized in that: The middle end surface of the bottom bucket (113) is provided with an observation window (6), and the inner sealing cover (323) of the observation window (6) is mounted.

4. The multi-stage filtration apparatus for fermentation broth of claim 1, wherein: The inner cavity bottom of the filter cartridge (312) is fixedly installed with a middle boss (4), and the middle boss (4) is used for guiding the fermentation liquid in the filter cartridge (312) to the inner wall of the filter cartridge (312).

5. The multi-stage filtration apparatus for fermentation broth of claim 1, wherein: The lower end outer wall of the circular table (23) is fixedly installed with a first drainage leaf (5), the lower end outer wall of the filter cartridge (312) is fixedly connected with a second drainage leaf (51), the first drainage leaf (5) is located at the inner cavity bottom of the upper cavity (71), and the second drainage leaf (51) is located at the inner cavity bottom of the lower cavity (72).

Images