Coupling type rotational flow mixer of fermentation tank

Abstract

A fermentation tank coupling type rotational flow mixer is characterized by comprising an inner shell and an outer shell which are circumferentially arranged, the inner shell is of an outward necking structure, center holes are formed in the middles of the upper end face and the lower end face of the inner shell respectively, the upper center hole is connected with a center stirring shaft through a coupler, and the lower center hole is communicated with an air inlet pipe through a bent pipe; a gas phase rotational flow channel is formed in the inner shell, the outer shell is of a disc-shaped structure with the outer portion necking down, liquid inlets are formed in the upper end face and the lower end face of the outer shell, and an outer end nozzle of the inner shell extends into the liquid inlets of the outer shell and is located on the same axis with an outlet of the outer shell. A plurality of gas-liquid mixing channels are separated between the inner shell and the outer shell through arc-shaped spacers, and gas and liquid are distributed in the circumferential direction after being fully mixed in the gas-liquid mixing channels and are sprayed into the fermentation tank in the tangential direction of the tail end; the gas-liquid mixing device has the characteristics of reasonable structure, good gas-liquid mixing effect, high efficiency and energy conservation, and is easy to clean and sterilize.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of energy-saving air inlet device of fermentation tank, especially a kind of fermentation tank shaft combined type cyclone mixer, it is applied to the energy-saving air inlet device of industrialization aerobic biological fermentation tank. BACKGROUND

[0002] Aerobic biological fermentation is an important part of synthetic biology and genomics serving industrialized biological intelligent manufacturing production practice. The production bacteria after genetic modification need to consume a large amount of oxygen in the process of growth, metabolism and target product output. Therefore, a large amount of sterile air needs to be introduced into the bioreactor during fermentation. With the increasing volume of fermentation tank monomer, the increasing bacteria concentration of reactor and the improvement of high ventilation and high inoculation production process, it is of great significance to realize a high-efficiency and energy-saving fermentation tank air inlet device.

[0003] The air inlet device of traditional fermentation tank is usually fixed at the bottom of the fermentation tank body, and usually has the forms of straight-through type, umbrella cover, perforated coil type and jet pipe. The basic idea of such air inlet device is to use the static pressure of compressed air to inject into the reactor and mix with the fermentation mash. The straight-through type and umbrella cover type air inlet device has a too simple structure, and cannot achieve uniform gas-liquid distribution for large-diameter fermentation tanks. The perforated coil type device has limited gas-liquid mixing capacity, and the perforated static device is prone to blockage for high-viscosity fermentation liquid. The jet pipe type device requires a large compressed air pressure, which is not conducive to the overall energy saving of fermentation, and the nozzle is also prone to blockage during long-term use, which is not convenient to maintain.

[0004] At present, the fermentation tank usually uses a permanent magnet synchronous motor to directly drive the mechanical stirring in the tank. This scheme replaces the original belt pulley or reducer driving scheme, has large load capacity, improves transmission efficiency and reduces energy consumption. If the fermentation tank air inlet device is combined with stirring, the gas-liquid mixing capacity of the air inlet device can be greatly enhanced. In addition, compared with fixed equipment, the dynamic air inlet device has better adaptability to fermentation liquid with different materials and different viscosities, and the equipment structure is not prone to blockage.

[0005] After investigation, the existing Chinese patent No. 201010148330.7 "A cyclone mixer" includes a reaction container containing liquid, an air inlet is provided on the container, an inner shell is provided above the air inlet, a gas phase cyclone passage is formed between the inner shell and the inner wall of the container or between the inner shell and the inner shell, an outer shell is provided above the inner shell, a liquid inlet is opened in the middle of the outer shell, a fluid cyclone passage is formed between the outer shell and the inner shell, and the outer ends of the gas phase cyclone passage and the fluid cyclone passage merge into a gas-liquid mixed flow cyclone passage. The cyclone mixer can enhance the gas-liquid mixing effect in the tank. However, the cyclone mixer is fixed inside the fermentation tank and cannot be disassembled, which is not convenient to maintain and cannot meet the application occasions of high-viscosity fermentation liquid. SUMMARY

[0006] The technical problem to be solved by the present application is to provide a fermentation tank shaft coupling type cyclone mixer with reasonable structure, good gas-liquid mixing effect and convenient maintenance.

[0007] The technical solution adopted by the present application to solve the above technical problem is: a fermentation tank shaft coupling type cyclone mixer, comprising a cyclone mixer, characterized in that: the cyclone mixer comprises a circumferentially arranged inner shell and an outer shell, the longitudinal section of the inner shell is in a structure with an outwardly tapered opening, and a central hole is formed in the upper and lower end faces of the inner shell, wherein a shaft coupling is welded and fixed at the upper central hole, the inner shell is connected to the central stirring shaft of the fermentation tank through the shaft coupling, the lower central hole is connected in communication with the gas inlet pipe of the fermentation tank through an elbow pipe, and a gap is left between the lower central hole and the upper end short section of the elbow pipe, a gas phase cyclone passage is formed in the inner shell, the outer shell is in a disc-shaped structure with an outwardly tapered opening, the outer shell is coaxially fixed outside the inner shell, liquid inlets are formed in the upper and lower end faces of the outer shell, the outer end nozzle of the inner shell extends into the liquid inlet position of the outer shell, and the outlet of the outer shell is on the same axis as the liquid inlet, a plurality of gas-liquid mixing passages are separated by arc-shaped partitions between the outer shell and the inner shell, the bending direction of the arc-shaped partitions is opposite to the rotating direction of the cyclone mixer, and the gas-liquid is fully mixed in the gas-liquid mixing passages and then sprayed into the fermentation tank in a circumferential distribution along the tangent direction of the arc-shaped partitions.

[0008] As an improvement, the middle part of the upper and lower end faces of the outer shell is a circular ring plane, the liquid inlet is formed on the circular ring plane, and the outer end of the circular ring plane is inclined downward and upward respectively to form a tapered opening as an outlet.

[0009] Further, the arc-shaped partitions are 10-24 vertically arranged partitions uniformly spaced along the circumference, the arc-shaped partitions are in a structure with a wide inner end and a narrow outer end matched with the inner wall of the outer shell, the outer end of the arc-shaped partitions is close to the outlet of the outer shell, and the outer end is in a sawtooth structure, and a positioning gap is formed in the middle part of the inner end of the arc-shaped partitions for the nozzle of the inner shell to insert.

[0010] Further, a plurality of through circular holes are arranged on the arc-shaped partitions for facilitating the exchange of fermentation liquid.

[0011] Further, the aperture of the through circular hole is 6-20 mm, the number of sawteeth of the sawtooth structure is 5-15, the sawtooth angle of the sawtooth structure is α=15-90°, and the pitch between adjacent vertices of the sawteeth is 10-50 mm.

[0012] Further preferably, the aperture of the through circular hole is 8-12 mm, the sawtooth angle is α=60°, and the pitch between adjacent vertices of the sawteeth is 20-50 mm.

[0013] Finally, one end of the elbow pipe is inserted into the lower central hole of the inner housing through a clearance fit, and the other end of the elbow pipe is connected to the gas inlet pipe of the fermentation tank.

[0014] Compared with the prior art, the utility model has the advantages that: the inner housing and the outer housing are arranged, the gas phase cyclone passage is formed in the inner housing, the inner housing and the outer housing are separated by the arc-shaped partition plate and multiple gas-liquid mixing passages are formed, the arc-shaped partition plate is provided with a circular hole, the turbulent flow of the multiphase flow in the passage of the inner housing and the outer housing is strengthened, the gas-liquid mixing effect is better, the outer end of the arc-shaped partition plate is provided with a sawtooth structure, the sawtooth structure has a reinforcing effect on the bubble breaking, and the sawtooth structure also has a reinforcing effect on the stirring and mixing of the high-viscosity non-Newtonian fluid such as biological polysaccharide; the cyclone mixer is fixed on the stirring shaft of the fermentation tank through the coupling, the shaft coupling type cyclone mixer rotates together with the stirring shaft of the fermentation tank during operation, and the gas-liquid mixing effect is better; the lower end of the inner housing is connected to the gas inlet pipe of the fermentation tank through the elbow pipe, and the cyclone mixer is detachable, so that the maintenance is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a structure schematic view of the utility model embodiment installed in the tank body;

[0016] Fig. 2 It is a top view of the utility model embodiment;

[0017] Fig. 3 It is a structure schematic view of the arc-shaped partition plate of the utility model embodiment. DETAILED DESCRIPTION

[0018] The utility model will be further described in detail in combination with the drawings.

[0019] As Figs. 1-3As shown in the figure, the shaft coupling type cyclone mixer of the fermentation tank comprises a cyclone mixer 5 arranged in a fermentation tank 2, a central stirring shaft 3 arranged in the fermentation tank 2, and a compressed air inlet pipe 1 arranged at the bottom of the fermentation tank 2. The cyclone mixer 5 comprises a circumferentially arranged inner shell 51 and an outer shell 52. The longitudinal section of the inner shell 51 is outwardly tapered, and the overall section is close to a rhombic structure. A central hole is respectively arranged in the upper and lower end faces of the inner shell 51. A coupling 4 is welded and fixed at the upper central hole, and the inner shell 51 is connected with the central stirring shaft 3 of the fermentation tank 2 through the coupling 4. The lower central hole is communicated with the air inlet pipe 1 of the fermentation tank 2 through a bend pipe 6. A gap is left between the lower central hole and the upper end short section of the bend pipe. The inner shell 51 forms a gas phase cyclone passage. The outer shell 52 is a disc-shaped structure with an outwardly tapered structure. The outer shell 52 is coaxially fixed outside the inner shell 51. Liquid inlets are arranged in the upper and lower end faces of the outer shell 52. The outer end nozzle 511 of the inner shell 51 extends into the liquid inlet position of the outer shell 52 and is on the same axis with the outlet 521 of the outer shell 52. The outer shell 52 and the inner shell 51 are separated by arc-shaped partitions 53 to form a plurality of gas-liquid mixing passages 54. The bending direction of the arc-shaped partitions 53 is opposite to the rotating direction of the cyclone mixer 5. After being fully mixed in the gas-liquid mixing passages 54, the gas-liquid is distributed in the circumferential direction and is injected into the fermentation tank 2 along the tangent direction of the end of the arc-shaped partitions.

[0020] Specifically, the middle part of the upper and lower end faces of the outer shell 52 is a circular ring plane. The liquid inlets are arranged on the circular ring plane. The outer end of the circular ring plane is inclined downward and upward to form the tapered outlet 521. The arc-shaped partitions 53 are 10-24 vertically arranged uniform intervals, and 12 in the embodiment. The arc-shaped partitions 53 are structures with a wide inner end and a narrow outer end matched with the inner wall of the outer shell 52. The outer end of the arc-shaped partitions 53 is close to the outlet of the outer shell 52, and the outer end is a sawtooth structure 532. The middle part of the inner end of the arc-shaped partitions 53 is provided with a positioning gap 533 for inserting the nozzle 511 of the inner shell 51. A plurality of through holes 531 are arranged on the arc-shaped partitions 53 for the fermentation liquid to pass through and exchange. The diameter of the through holes 531 is 6-20 mm. The number of sawteeth of the sawtooth structure 532 is 5-15. The sawtooth angle of the sawtooth structure 532 is α=15-90°. The pitch of adjacent vertices of the sawtooth is 10-50 mm. Preferably, the diameter of the through holes 531 is 8-12 mm. The sawtooth angle is α=60°. The pitch of adjacent vertices of the sawtooth is 20-50 mm.

[0021] The coupling 4 is fixed with the upper central hole of the inner shell 51 through the lower flange bolt. One end of the bend pipe 6 is inserted into the lower central hole of the inner shell 51 through the gap fit. The other end of the bend pipe 6 is welded and connected with the air inlet pipe 1 of the fermentation tank 2. In this way, the cyclone mixer 5 can rotate with the central stirring shaft 3, and can be disassembled for daily maintenance.

[0022] The specific working principle is as follows:

[0023] The cyclone mixer 5 rotates with the central stirring shaft 2, sterile compressed air enters the inner shell 51 from the air inlet pipe 1, is sprayed into the outer shell 52 from the inner shell 51, and the compressed air generates negative pressure during the spraying process, so that the fermentation liquid is sucked into the gas-liquid mixing channel 54 of the outer shell 52 from the upper and lower liquid inlets of the outer shell 52, and is then sprayed into the fermentation tank 2 along the tangential direction of the arc-shaped partition end after being fully mixed in the gas-liquid mixing channel 54.

[0024] During the rotating operation of the cyclone mixer, the fermentation liquid is sprayed out from the channel of the outer shell 52 in the circumferential direction, and a part of the fermentation liquid is re-sucked into the outer shell 52 from the upper and lower liquid inlets of the outer shell 52 to be mixed with gas, thereby forming a circulating movement of the part of the fermentation liquid.

[0025] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A fermenter shaft-mounted cyclone mixer comprising a cyclone mixer characterised in that: The cyclone mixer comprises a circumferentially arranged inner shell and an outer shell, the longitudinal section of the inner shell is in the shape of an outwardly tapered structure, and a central hole is formed in the middle of the upper and lower end faces of the inner shell respectively, wherein a coupling is welded and fixed at the upper central hole, the inner shell is connected with the central stirring shaft of the fermentation tank through the coupling, the lower central hole is connected in communication with the gas inlet pipe of the fermentation tank through an elbow pipe, a gap is left between the lower central hole and the upper end short section of the elbow pipe, a gas phase cyclone passage is formed in the inner shell, the outer shell is in the shape of an outwardly tapered disc structure, the outer shell is coaxially fixed outside the inner shell, liquid inlets are formed in the upper and lower end faces of the outer shell, the outer end nozzle of the inner shell extends into the position of the liquid inlet of the outer shell, and the outlet of the outer shell is on the same axis as the outer end nozzle of the inner shell, a plurality of gas-liquid mixing passages are separated between the outer shell and the inner shell through arc-shaped partitions, the bending direction of the arc-shaped partitions is opposite to the rotating direction of the cyclone mixer, and the gas-liquid is fully mixed in the gas-liquid mixing passages and then sprayed into the fermentation tank in a circumferential distribution along the tangent direction of the end of the arc-shaped partitions.

2. The shaft-mounted hydrocyclone mixer for a fermenter of claim 1, wherein: The middle part of the upper and lower end faces of the outer shell is a circular ring plane, the liquid inlets are formed on the circular ring plane, and the outer end of the circular ring plane is inclined downward and upward respectively to form a tapered structure as an outlet.

3. The shaft-mounted hydrocyclone mixer for a fermenter of claim 2, wherein: The arc-shaped partitions are 10-24 vertically arranged partitions uniformly spaced along the circumference, the arc-shaped partitions are in the structure of a wide inner end and a narrow outer end matched with the inner wall of the outer shell, the outer end of the arc-shaped partitions is close to the outlet of the outer shell, and the outer end is in a sawtooth structure, and a positioning notch for the nozzle of the inner shell to insert is formed in the middle of the inner end of the arc-shaped partitions.

4. The shaft-mounted hydrocyclone mixer for a fermenter of claim 3, wherein: A plurality of through circular holes are arranged on the arc-shaped partitions for the fermentation liquid to pass through and exchange.

5. The shaft-mounted hydrocyclone mixer for a fermenter of claim 4, wherein: The number of sawteeth of the sawtooth structure is 5-15, the sawtooth angle of the sawtooth structure is α=15-90°, and the pitch of adjacent vertices of the sawteeth is 10-50 mm.

6. The shaft-mounted hydrocyclone mixer for a fermenter of claim 5, wherein: The diameter of the through circular hole is 6-20 mm.

7. The shaft-mounted hydrocyclone mixer for a fermenter of claim 6, wherein: The diameter of the through circular hole is 8-12 mm, the sawtooth angle is α=60°, and the pitch of adjacent vertices of the sawteeth is 20-50 mm.

8. The shaft-mounted hydrocyclone mixer for a fermenter of any one of claims 1 to 5, wherein: One end of the elbow pipe is inserted into the lower central hole of the inner shell through a gap fit, and the other end of the elbow pipe is connected with the gas inlet pipe of the fermentation tank.

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