Mixing device

Abstract

The utility model provides a mixing device and relates to the technical field of fermentation. The mixing device comprises a tank body, a stirring device and an air diffusion structure, the stirring device comprises a stirring shaft arranged in the tank body, a rotation driving source connected with the stirring shaft and used for driving the stirring shaft to rotate in a fixed-axis mode and stirring blades arranged on the stirring shaft, and the air diffusion structure is located at the bottom of the tank body and corresponds to the stirring device. The air diffusion structure comprises an air distribution pipe provided with a filter part, diffusion holes are formed in the filter part, and gas introduced into the air distribution pipe is filtered and diffused through the diffusion holes in the filter part. The mixing device disclosed by the utility model can further enhance the fermentation dissolved oxygen level and fulfill the aims of saving energy and improving the oxygen utilization rate to the maximum extent.

Description

Technical Field

[0001] The utility model generally relates to the field of fermentation technology. Specifically, it relates to a mixing device. Background Art

[0002] Long-chain dicarboxylic acids refer to aliphatic dicarboxylic acids with multiple carbon atoms in the carbon chain, including saturated and unsaturated dicarboxylic acids. Long-chain dicarboxylic acids are important raw materials for synthesizing high-grade fragrances, high-performance engineering plastics, high-temperature electrolytes, high-grade hot-melt adhesives, cold-resistant plasticizers, high-grade lubricating oils, high-grade paints and coatings, etc. in the chemical industry, and have important and wide industrial uses.

[0003] At present, in the process of fermenting and producing long-chain dicarboxylic acids, the fermentation reactor needs aerobic stirring and respiration. The air distributor is related to the power energy consumption of fermentation, the consumption of air, the dissolved oxygen condition of fermentation, and even the quality of fermentation indexes.

[0004] Most of the existing air distributors are provided with uniformly distributed and identical air outlet holes on their circular structures. Directly setting the air outlet holes on the air distributor easily results in a relatively low dissolved oxygen level during the fermentation process, uneven bubble dispersion and relatively large bubbles. When combined with other devices such as stirring devices, it leads to low oxygen utilization rate, air waste, affects the biological metabolism oxygen supply capacity throughout the fermentation process, and thus causes waste of various energy sources in the biological fermentation industry. Therefore, there is an urgent need for a mixing device that is suitable for oxygen-consuming fermentation systems, has a relatively high dissolved oxygen level in fermentation, does not cause energy waste, and can be used in industrial production on a large scale. Summary of the Utility Model

[0005] A mixing device provided by the utility model can enhance the dissolved oxygen level in fermentation and achieve the purpose of energy conservation and improved oxygen utilization rate to the maximum extent.

[0006] According to the first aspect of the utility model, a mixing device is provided, which includes a tank body, a stirring device and an air diffusion structure. The stirring device includes a stirring shaft arranged inside the tank body, a rotary driving source connected to the stirring shaft and driving the stirring shaft to rotate around a fixed axis, and stirring blades arranged on the stirring shaft. The air diffusion structure is located at the bottom of the tank body and is arranged corresponding to the stirring device. The air diffusion structure includes an air distribution pipe provided with a filtering element, and diffusion holes are arranged on the filtering element. The gas introduced into the air distribution pipe is filtered and diffused through the diffusion holes on the filtering element.

[0007] In some embodiments, the number of the diffusion holes is multiple, and the projections of the multiple diffusion holes on a reference plane are arranged along the circumferential direction of the reference plane, and the reference plane is perpendicular to the axial direction of the air distribution pipe.

[0008] In some of these embodiments, the central angle of the projection of the filter element on the reference plane is 30° to 360°; wherein, the reference plane is perpendicular to the axial direction of the air distribution pipe.

[0009] In some of these embodiments, the stirring blade is any one or a combination of several of a flat paddle blade, an inclined paddle blade, a disk turbine blade, or a spiral blade;

[0010] Wherein, the disk turbine blade is disposed at the lower part of the rotatable shaft, and / or, the flat paddle blade, the inclined paddle blade, and the spiral blade are disposed at the upper part and / or the middle part of the stirring shaft.

[0011] In some of these embodiments, the filter element and the air distribution pipe are of a split structure; and / or, the filter element and the air distribution pipe are connected by welding or a connecting member.

[0012] In some of these embodiments, the filter element is of an arc structure, the outer diameter of the filter element is the same as the outer diameter of the air distribution pipe, and the inner diameter of the filter element is the same as the inner diameter of the air distribution pipe;

[0013] and / or, the wall thickness of the filter element is 0.5 mm to 20 mm;

[0014] and / or, the aperture of the diffusion hole is 1 μm to 1000 μm.

[0015] In some of these embodiments, the air distribution pipe includes a plurality of sub-pipe bodies, and adjacent two of the sub-pipe bodies are connected by the filter element;

[0016] and / or, the number of the filter elements is multiple, the multiple filter elements are arranged at intervals along the axial direction of the air distribution pipe, and adjacent two of the filter elements are connected by the sub-pipe body;

[0017] and / or, the multiple filter elements are respectively arranged on two sides or the same side in the axial direction of the air distribution pipe.

[0018] In some of these embodiments, the air distribution pipe is any one of a semi-ring, a ring, an elliptical ring, or a polygonal ring.

[0019] In some of these embodiments, the filter element is at least one of a filter mesh element, a wire mesh element, a screen mesh element, a sintered mesh element, a sintered felt element, a powder sintered element, or a membrane filter element.

[0020] In some of these embodiments, a heater is further included, and the heater is disposed inside and / or outside the tank body for adjusting the temperature of the tank body and the reaction medium therein; the heater is selected from a coil heat exchanger, a shell-and-tube heat exchanger, a spiral tube heat exchanger, or an outer wall jacket heat exchanger.

[0021] In some of these embodiments, an intake pipe communicating with the air distribution pipe is further provided below the tank body for introducing gas.

[0022] In some of these embodiments, the mixing device further includes a support member disposed at the bottom of the tank body for supporting the air diffusion structure.

[0023] One embodiment of the present utility model has the following advantages or beneficial effects:

[0024] For the mixing device provided by the embodiment of the present utility model, the gas entering from the intake pipe is transported to the filter element through the air distribution pipe. The filter element plays a role in filtering gas impurities. And under the guiding action of the filter element, the air resistance is relatively small. The externally supplied air is dispersed in specific mesh pores. The air is evenly dispersed under the action of pressure and quickly exits the filter element. While the filter element realizes the uniform dispersion of the gas, it can also cut the gas into smaller and denser bubbles. The bubbles carry oxygen and diffuse into the fermentation broth. Finally, under the stirring action of the stirring device, the bubbles are evenly dispersed into the fermentation broth. This structure can maximize the utilization and improvement of the mass transfer and oxygen transfer effects during the fermentation metabolism process, improve the oxygen utilization rate, enhance the dissolved oxygen level of the fermentation, and save a large amount of energy.

[0025] For the mixing device provided by this embodiment, the air diffusion structure provides the gas required for the reaction of the fermentation. Its bubbles are tiny and dense. The bubbles are jet by the filter element into the fermentation broth. The stirring device located above the air diffusion structure evenly disperses the bubbles in the fermentation broth through stirring, enhancing the dissolved oxygen level of the fermentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To better understand the present utility model, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of the present utility model. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the drawings, the same reference numerals denote the same or similar components in each drawing. By describing its exemplary embodiments in detail with reference to the drawings, the above and other features and advantages of the present utility model will become more apparent.

[0027] Wherein:

[0028] Figure 1 Shown is a schematic structural diagram of the mixing device of Embodiment 1 of the present utility model;

[0029] Figure 2 Shown is a side view of the air diffusion structure of Embodiment 1 of the present utility model;

[0030] Figure 3 Shown isFigure 2 Cross-sectional view at E-E;

[0031] Figure 4 As shown is Figure 3 a partially enlarged view;

[0032] Figure 5 As shown is a side view of the filter element in the air diffusion structure of the first embodiment of the present utility model;

[0033] Figure 6 As shown is Figure 5 cross-sectional view at C-C;

[0034] Figure 7 As shown is a side view of the air diffusion structure of the second embodiment of the present utility model;

[0035] Figure 8 As shown is Figure 7 cross-sectional view at A-A;

[0036] Figure 9 As shown is a side view of the air diffusion structure of the third embodiment of the present utility model;

[0037] Figure 10 As shown is Figure 9 cross-sectional view at B-B.

[0038] Among them, the reference numerals are explained as follows:

[0039] 100, tank body;

[0040] 200, stirring device; 201, stirring shaft; 202, rotation driving source; 203, stirring blade;

[0041] 300, air diffusion structure; 1, air distribution pipe; 2, filter element; 20, diffusion hole; 21, first filter element; 22, second filter element; 3, air inlet pipe; 4, connecting member;

[0042] 400, heater;

[0043] 500, support member. Detailed implementation manners

[0044] Next, the technical solutions in the exemplary embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the exemplary embodiments of the present utility model. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the protection scope of the present utility model. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the protection scope of the present utility model.

[0045] In the description of the present utility model, unless otherwise clearly specified and defined, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance; the term "plurality" means two or more; the term "and / or" includes any combination and all combinations of one or more of the associated listed items. In particular, referring to "the / a" object is also intended to mean one of the possible plurality of such objects.

[0046] Unless otherwise specified or stated, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] Furthermore, in the description of the present utility model, it should be understood that the orientation terms such as "upper", "lower", "inner", and "outer" described in the exemplary embodiments of the present utility model are described from the angles shown in the drawings and should not be construed as limiting the exemplary embodiments of the present utility model. It should also be understood that in the context, when referring to an element or feature being connected "on", "under", or "inside", "outside" another element (one or more), it can not only be directly connected "on", "under", or "inside", "outside" another (one or more) element, but also be indirectly connected "on", "under", or "inside", "outside" another (one or more) element through an intermediate element.

[0048] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present utility model will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed description will be omitted.

[0049] Example 1

[0050] This example provides a mixing device, such as Figure 1As shown, the mixing device includes a tank body 100, a stirring device 200, and an air diffusion structure 300. The stirring device 200 includes a stirring shaft 201 disposed inside the tank body 100, a rotary drive source 202 connected to the stirring shaft 201 to drive the stirring shaft 201 to rotate about a fixed axis, and stirring blades 203 disposed on the stirring shaft 201. The air diffusion structure 300 is located at the bottom of the tank body 100 along the axial direction of the tank body 100 and is correspondingly disposed with the stirring device 200. The air diffusion structure 300 includes an air distribution pipe 1 provided with a filter element 2, and diffusion holes 20 are provided on the filter element 2 (as Figure 5 shown). The gas introduced into the air distribution pipe 1 is filtered and diffused through the diffusion holes 20 on the filter element 2.

[0051] Specifically, when the tank body 100 is of a vertical structure, along the axial direction of the tank body 100, the stirring device 200 is located above the air diffusion structure 300.

[0052] For the mixing device provided in this embodiment, the air diffusion structure 300 provides the gas required for the reaction for the tank body 100. For example, air, oxygen, etc. The air diffusion structure 300 is located at the bottom of the tank body 100 along the axial direction of the tank body 100. The gas diffused from the air diffusion structure 300 is uniformly dispersed in the fermentation broth under the stirring action of the stirring device 200, improving the fermentation dissolved oxygen level.

[0053] Among them, the tank body 100 can also be called a reaction kettle. The tank body 100 is of a hollow structure. The accommodation cavity inside the tank body 100 is used to accommodate materials and provide a reaction space for the fermentation of the materials. Among them, the materials can specifically be selected from one or more of alkanes, straight-chain saturated fatty acids, straight-chain saturated fatty acid esters, and straight-chain saturated fatty acid salts, etc.

[0054] In one embodiment, as Figure 1 shown, the mixing device further includes a support member 500. The support member 500 can specifically be selected as a U-shaped fastening member. The air diffusion structure 300 is fixed inside the tank body 100 through the support member 500. While the support member 500 achieves the fixing effect of the air diffusion structure 300, it also plays a supporting role for the air diffusion structure 300.

[0055] As Figure 1 shown, the rotary drive source 202 can be selected as a drive motor. The output end of the rotary drive source 202 is connected to the stirring shaft 201. The stirring shaft 201 and the stirring blades 203 are disposed inside the tank body 100. The rotary drive source 202 drives the stirring shaft 201 to rotate, and then drives the stirring blades 203 to rotate relative to the tank body 100, which is beneficial to uniformly disperse the bubbles diffused from the air diffusion structure 300 in the fermentation liquid, improving the oxygen utilization rate and saving a large amount of energy.

[0056] Exemplarily, the stirring blade 203 is any one or a combination of a flat paddle blade, an inclined paddle blade, a disk turbine blade, or a helical blade. Preferably, the stirring blade 203 is a combination of a disk turbine blade and a helical blade. By using a combined type of stirring blade, the effective acting force of stirring and reaction can be further improved, the resistance can be reduced, and energy and costs can be greatly saved. At the same time, the gas diffused from the air diffusion structure can be evenly dispersed into microbubbles inside the tank body by the action of the stirring blade, and the dissolved oxygen can be increased.

[0057] Exemplarily, the disk turbine blade is provided at the lower part of the stirring shaft.

[0058] Exemplarily, the flat paddle blade, the inclined paddle blade, and the helical blade are provided at the upper part and / or the middle part of the stirring shaft.

[0059] It should be noted that the disk turbine blade is of a V shape, an arrow leaf shape, a semi-circular shape, or a combination thereof. The number of blades of the disk turbine blade is 4 - 12, preferably 4 - 8. More than 1 group of disk turbine blades are provided at the lower part of the stirring shaft, such as 2 groups, 3 groups, or more groups. The number of blades of the helical blade is 2 - 10, preferably 3 - 6. More than 2 groups of helical blades are uniformly arranged along the stirring shaft from top to bottom, such as 2 groups, 3 groups, 4 groups, or more groups.

[0060] As Figure 1 shown, the mixing device further includes a heater 400. The heater 400 is disposed inside the tank body 100 and is used to adjust the temperature of the tank body and the reaction medium inside it. According to actual needs, the heater can also be disposed outside the tank body 100, or simultaneously disposed inside and outside the tank body 100.

[0061] Exemplarily, the heater 400 is selected from a coil heat exchanger, a shell and tube heat exchanger, a spiral tube heat exchanger, or an outer wall jacket heat exchanger.

[0062] As Figure 1 shown, the mixing device further includes an air inlet pipe 3 disposed below the tank body 100 and communicating with the air distribution pipe 1. The air inlet pipe 3 is used to introduce gas. The gas entering from the air inlet pipe 3 is transported to the filter element 2 through the air distribution pipe 1 and is filtered and diffused through the diffusion holes 20.

[0063] Among them, the air inlet pipe 3 can be connected to a power station. The power station can provide compressed gas with a pressure of more than 0.2 MPa. The compressed gas is transported to the fermentation broth in the tank body 100 through the air diffusion structure 300.

[0064] In addition, a control valve is provided in the connecting pipeline between the power station or between the power station and the air diffusion structure 300 to control the opening and closing of the gas. It can be automatically completed according to the set program, avoiding human participation, realizing unmanned automatic control, being able to stably supply gas, continuously supply oxygen evenly, with strong biological metabolism, energy saving, and reduced production costs.

[0065] Since in the fermentation production process, the microbial metabolism process belongs to deep stirring aerobic fermentation. During fermentation, while sufficient and uniform mixing is required, oxygen also needs to be input for metabolic reactions. By using the air diffusion structure 300, sufficient oxygen can be provided at different stages of microorganisms for the bacteria to absorb and utilize, enhancing the dissolved oxygen level in fermentation. Moreover, the gas phase, liquid phase, solid phase, and oil phase in the material can be evenly and fully aggregated and fused with each other, the bacteria can quickly absorb nutrients, accelerate the metabolic rate, improve the fermentation level, accelerate the material conversion, shorten the reaction time, improve production efficiency, and save energy.

[0066] For the air diffusion structure 300 provided in this embodiment, the gas entering from the air inlet pipe 3 is transported to the filter element 2 through the air distribution pipe 1. The filter element 2 plays a role in filtering gas impurities, and under the guiding action of the filter element 2, the wind resistance is relatively small. Using the diffusion holes 20 of the filter element 2, the gas can quickly disperse out of the filter element 2. While realizing the uniform dispersion of the gas, the gas can also be cut into smaller and denser bubbles. After the gas passes through the filter element 2 and jets into the tank body 100 of the reaction tank, under the stirring action of the stirring device 200, the diffused small bubbles can be evenly dispersed into the material in the tank body 100, increasing the dissolved oxygen level and contact area, and improving the gas utilization rate and reaction efficiency.

[0067] Among them, the filter element 2 is at least one of a filter mesh element, a wire mesh element, a screen mesh element, a sintered mesh element, a sintered felt element, a powder sintered element, or a membrane filter element.

[0068] Exemplarily, the filter mesh element includes a textile fiber filter mesh, a metal filter mesh, an aluminum mesh, a stainless steel mesh, a non-woven fabric, a fiber mesh, an activated carbon filter mesh, etc.

[0069] Exemplarily, the wire mesh element includes a natural wire mesh, a synthetic wire mesh, a metal wire mesh, a special wire mesh, etc.

[0070] Exemplarily, the screen mesh element includes a silk screen mesh, a synthetic fiber screen mesh, a metal wire screen mesh. The metal wire screen mesh includes, but is not limited to, a square hole mesh, a ginning mesh, a dense pattern mesh, etc.

[0071] Exemplarily, the sintered mesh element includes a stainless steel sintered mesh, a titanium sintered mesh, a ceramic sintered mesh, an orifice plate sintered mesh, a five-layer sintered mesh, a six-layer sintered mesh, a punched plate composite sintered mesh, a powder sintered mesh, a carbon sintered mesh, a metal composite sintered mesh, a glass fiber reinforced plastic sintered mesh, a carbon fiber sintered mesh, etc.

[0072] In one embodiment, the wall thickness of the filter element 2 is 0.5 mm to 20 mm. For example, the wall thickness of the filter element 2 is 0.5 mm, 1 mm, 3 mm, 5 mm, 15 mm, 20 mm, etc. The wall thickness of the filter element 2 in this embodiment is not limited, and the appropriate wall thickness of the filter element 2 can be selected according to the fluid stirring intensity and the material characteristics, so that the filter element 2 has a certain support strength and reduces the situation that the deformation of the filter element 2 affects the air permeability and the fluid direction of the gas in the tank body 200.

[0073] In one embodiment, as Figures 1 - 6 shown, the filter element 2 and the air distribution pipe 1 are of a split structure. Since the materials of the filter element 2 and the air distribution pipe 1 may be the same or different, the split filter element 2 and air distribution pipe 1 have good freedom and flexibility during manufacturing. Specifically, the filter element 2 and the air distribution pipe 1 are connected by welding or a connecting member 4 to form an integral structure, with a simple process and relatively low production cost. Among them, the connecting member 4 can be a flange, a sleeve, etc.

[0074] In one embodiment, the filter element 2 is of an arc structure, the outer diameter of the filter element 2 is the same as the outer diameter of the air distribution pipe 1, and the inner diameter of the filter element 2 is the same as the inner diameter of the air distribution pipe 1. In this way, the sizes of the filter element 2 and the air distribution pipe 1 are adapted to each other, ensuring the docking matching of the filter element 2 and the air distribution pipe 1.

[0075] Specifically, the air distribution pipe 1 includes a plurality of sub-pipe bodies, and two adjacent sub-pipe bodies are connected by the filter element 2. For example, the number of sub-pipe bodies is four, and two adjacent sub-pipe bodies are connected by the filter element 2, and the filter element 2 plays an intermediate connecting role.

[0076] Specifically, the number of the filter elements 2 is multiple, and the multiple filter elements 2 are arranged at intervals along the axial direction of the air distribution pipe 1, and two adjacent filter elements 2 are connected by a sub-pipe body. For example, the number of the filter elements 2 is two, and the two filter elements 2 are connected by a sub-pipe body, and the sub-pipe body plays an intermediate connecting role.

[0077] It can be understood that the interval between two adjacent filter elements 2 can be fixed or not fixed, and whether it is a fixed value can be adjusted according to actual production needs.

[0078] Specifically, the number of both the sub-pipe bodies and the filter elements 2 is multiple, the filter elements 2 are arranged between two adjacent sub-pipe bodies, and the sub-pipe bodies are arranged between two adjacent filter elements 2, that is, the sub-pipe bodies and the filter elements 2 are arranged alternately.

[0079] Specifically, multiple filter elements 2 are respectively arranged on both sides or the same side with respect to the axial direction of the air distribution pipe 1. That is, multiple filter elements 2 can be located on the upper side part of the air distribution pipe 1 at the same time, multiple filter elements 2 can be located on the lower side part of the air distribution pipe 1 at the same time, or multiple filter elements 2 are respectively located on the upper side part and the lower side part of the air distribution pipe 1. Among them, the axial direction of the air distribution pipe 1 is identified by D.

[0080] In one embodiment, the air distribution pipe 1 is any one of a semi-ring, a circular ring, an elliptical ring, and a polygonal ring, which is beneficial to installation and fixation, and is conducive to uniform gas diffusion in the tank body 100. Among them, the polygonal structure includes but is not limited to a quadrilateral, a pentagon, a hexagon, an octagon, etc.

[0081] It can be understood that there can be one or multiple air distribution pipes. The specific number of air distribution pipes set, as well as the structural arrangement of multiple air distribution pipes, can be adjusted according to actual production needs.

[0082] In one embodiment, the central angle of the filter element 2 projected on the reference plane is 30° to 360°; among them, the reference plane is perpendicular to the axial direction of the air distribution pipe 1.

[0083] For example, the central angle of the filter element 2 projected on the reference plane is 360°, the filter element 2 is a tubular structure, and the filter element 2 is adapted to the air distribution pipe 1. Specifically, the inner and outer diameters of the filter element 2 correspond to the inner and outer diameters of the air distribution pipe 1, so that the filter element 2 and the air distribution pipe 1 are docked.

[0084] In one embodiment, the number of diffusion holes 20 is multiple, and the projections of the multiple diffusion holes 20 on the reference plane are arranged along the circumferential direction of the reference plane. That is, the multiple diffusion holes 20 are distributed on the entire circumferential side wall of the filter element 2, improving the uniformity and dispersion effect of gas diffusion.

[0085] Exemplarily, the multiple diffusion holes 20 are distributed in a layer along the circumferential side wall of the filter element 2, and the diffusion holes 20 of multiple layers are distributed along the axial direction of the filter element 2, so that the multiple diffusion holes 20 cover the entire circumferential side wall of the filter element 2.

[0086] It should be particularly noted that when at least one air distribution pipe 1 and at least one filter element 2 form an arc structure, the central axial direction of the arc structure and the axial direction of the air distribution pipe 1 are in different directions, the central axial direction of the arc structure is perpendicular to the axial direction of the air distribution pipe 1, and the central axial direction of the arc structure is parallel to the reference plane.

[0087] In one embodiment, the aperture of the diffusion hole 20 is 1um to 1000um.

[0088] It is understandable that the pore diameters of the diffusion holes 20 can be the same or different. If the gas pressure entering the air distribution pipe 1 is the same, regardless of whether the pore diameters of the diffusion holes 20 are consistent, the uniformity of the gas outlet of the diffusion holes 20 can be ensured.

[0089] The air distribution structure provided by the present application can improve the utilization rate of biological metabolic oxygen, increase the fermentation yield, save energy, improve the mass transfer and oxygen transfer ability of the entire biological metabolic system, increase the dissolved oxygen level, enhance the fermentation metabolic ability, rapidly accumulate fermentation products, and increase the yield during the fermentation production process of long-chain dibasic acids. By setting the pore diameter, angle, and distribution of the diffusion holes 20, the present utility model outputs oxygen without dead angles, can maximize the utilization and improve the mass transfer and oxygen transfer effects during the fermentation metabolism process, improve the oxygen utilization rate, enhance the activity, facilitate biological conversion, improve the fermentation production index, and can achieve the purpose of energy conservation during fermentation production, shorten the fermentation cycle, and reduce the consumption of various energy sources, such as production materials like circulating water, air, and electricity.

[0090] Example Two

[0091] This embodiment is similar to Example One, with the only difference being the specific detailed structure of the filter element 2.

[0092] As Figures 7 - 8 shown, the central angle of the projection of the filter element 2 provided in this embodiment on the reference plane is 180°, that is, the filter element 2 is a semi-circular structure, and the inner and outer diameters of the filter element 2 are adapted to the inner and outer diameters of the air distribution pipe 1.

[0093] Since the semi-circular filter element 2 does not contact the air distribution pipe 1 throughout the entire circle, the contact area between the semi-circular filter element 2 and the inner wall of the air distribution pipe 1 is relatively small, which is convenient for welding, the process is simple, and the production cost is relatively low.

[0094] Specifically, an opening is provided in the upper part of the air distribution pipe 1 corresponding to the filter element 2, and the opening is used to accommodate and install the filter element 2. The lower part of the air distribution pipe 1 corresponding to the filter element 2 is for the flow of gas. The air volume of the upper part is relatively large, and the gas disturbance is relatively intense between the upper part and the lower part or in the local range nearby, which improves the speed of gas dispersion.

[0095] Example Three

[0096] This embodiment has a similar structure to Example One, with the only difference being the structure and arrangement of the filter element 2.

[0097] As Figures 9 - 10 shown, the filter element 2 provided in this embodiment includes a first filter element 21 and a second filter element 22, and the central angles of the projections of the first filter element 21 and the second filter element 22 on the reference plane are different.

[0098] For example, the central angle of the projection of the first filter element 21 on the reference plane is 360°, and the central angle of the projection of the second filter element 22 on the reference plane is 180°. The first filter element 21 can be called an annular structure, and the second filter element 22 can be called a semi-annular structure.

[0099] Through the mutual cooperation of the first filter element 21 and the second filter element 22, the gas diffusion mode can be adjusted according to the actual use situation, with a wide range of use scenarios and strong versatility. It can be understood that the types of the filter elements 2 can be the same or different, and the central angle of the projection of the filter element 2 on the reference plane can also be 30°, 60°, 90°, 120°, etc.

[0100] Specifically, the first filter element 21 and the second filter element 22 are arranged on both sides or the same side with respect to the axial direction of the air distribution pipe 1. That is, different types of filter elements 2 can be located on the upper side or the lower side of the air distribution pipe 1 at the same time, or different types of filter elements 2 are respectively located on the upper and lower sides of the air distribution pipe 1.

[0101] Specifically, at least one first filter element 21 is arranged between two adjacent second filter elements 22; and / or, at least one second filter element 22 is arranged between two adjacent first filter elements 21.

[0102] Exemplarily, the semi-annular structure and the annular structure are arranged alternately, that is, ABAB is arranged alternately; it can also be that the semi-annular, annular structure, annular structure, and semi-annular are arranged in sequence, that is, ABBA is arranged alternately; it can also be that in the ABBA alternating mode, one of the semi-annular structures is located on the upper side of the air distribution pipe 1, and the other semi-annular structure can also be located on the lower side of the air distribution pipe 1.

[0103] Embodiment Four

[0104] This embodiment is similar to Embodiment One, and the only difference lies in the different diffusion holes 20.

[0105] The diffusion holes 20 provided in this embodiment include first diffusion holes and second diffusion holes. The distance between the first diffusion holes and the intake pipe 3 is less than the distance between the second diffusion holes and the intake pipe 3; wherein, the aperture of the first diffusion holes is less than the aperture of the second diffusion holes.

[0106] Since the distance between the first diffusion holes and the intake pipe 3 is relatively close, and the distance between the second diffusion holes and the intake pipe 3 is relatively far, the air pressure near the first diffusion holes is relatively high, and the air pressure near the second diffusion holes is relatively low. The aperture of the first diffusion holes can be appropriately reduced, and the aperture of the second diffusion holes can be appropriately increased, that is, a smaller aperture corresponds to the position with higher air pressure, and a larger aperture corresponds to the position with lower air pressure, to ensure the uniformity of gas filtration and diffusion from the diffusion holes 20.

[0107] Among them, the aperture of the first diffusion hole is 1 um to 500 um. For example, the aperture of the first diffusion hole is 1 um, 10 um, 100 um, 500 um, etc.; the aperture of the second diffusion hole is 500 um to 1000 um. For example, the aperture of the second diffusion hole is 501 um, 60 um, 800 um, 1000 um, etc.

[0108] In one embodiment, the distance between the first diffusion hole and the intake pipe 3 is less than or equal to the radius of the outer circle in the annular structure; and / or, the distance between the second diffusion hole and the intake pipe 3 is greater than the radius of the outer circle in the annular structure.

[0109] Exemplarily, if the air distribution pipe is a circular ring structure, after the gas introduced from the intake pipe 3 enters the air distribution pipe, the gas flows through the air distribution pipe to the first position. The central angle between the first position and the intake pipe 3 is approximately 90°. At this first stage, the pressure of the gas is relatively high; the gas continues to flow along the air distribution pipe, and the gas flows from the first position to the second position. The central angle between the second position and the intake pipe 3 is approximately 180°. At this second stage, the pressure of the gas is relatively low.

[0110] According to the radius of the outer circle of the annular structure, the first stage and the second stage are divided, and the radius of the outer circle of the annular structure is used as the boundary for distinguishing the first diffusion hole and the second diffusion hole, further improving the uniformity of gas diffusion.

[0111] It should be noted here that what is shown in the drawings and described in this specification is only an example of adopting the principle of the present invention. Those of ordinary skill in the art should clearly understand that the principle of the present invention is not limited to any details of the device shown in the drawings or described in the specification or any component.

[0112] It should be understood that the present invention does not limit its application to the detailed structure and arrangement of the components proposed in this specification. The present invention can have other embodiments and can be implemented and executed in various ways. The foregoing variations and modifications fall within the scope of the present invention. It should be understood that the present invention disclosed and defined in this specification extends to all alternative combinations of two or more separate features mentioned or apparent in the text and / or drawings. All these different combinations constitute multiple alternative aspects of the present invention. The embodiments described in this specification illustrate the best mode known for implementing the present invention and will enable those skilled in the art to utilize the present invention.

[0113] Those skilled in the art will readily conceive of other embodiments of the present utility model after considering the specification and practicing the creation disclosed herein. The present utility model is intended to cover any variations, uses, or adaptations of the present utility model, which follow the general principles of the present utility model and include well-known common general knowledge or conventional technical means in the technical field not disclosed by the present utility model. The specification and the exemplary embodiments are only regarded as exemplary, and the true scope and spirit of the present utility model are pointed out by the appended claims.

[0114] It should be understood that the present utility model is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The protection scope of the present utility model is only limited by the appended claims.

Claims

1. A mixing device, comprising a tank body, a stirring device and an air diffusion structure. The stirring device includes a stirring shaft disposed inside the tank body, a rotary drive source connected to the stirring shaft and driving the stirring shaft to rotate about a fixed axis, and stirring blades disposed on the stirring shaft. The air diffusion structure is located at the bottom of the tank body and is correspondingly arranged with the stirring device. It is characterized in that, the air diffusion structure includes an air distribution pipe provided with a filter element, and diffusion holes are provided on the filter element. The gas introduced into the air distribution pipe is filtered and diffused through the diffusion holes on the filter element; the air distribution pipe includes a plurality of sub-pipe bodies, and adjacent two of the sub-pipe bodies are connected through the filter element.

2. The mixing device according to claim 1, characterized in that, The number of the diffusion holes is multiple, and the projections of the multiple diffusion holes on a reference plane are arranged along the circumferential direction of the reference plane; wherein, the reference plane is perpendicular to the axial direction of the air distribution pipe.

3. The mixing device according to claim 1, characterized in that, The central angle of the projection of the filter element on the reference plane is 30° to 360°; wherein, the reference plane is perpendicular to the axial direction of the air distribution pipe.

4. The mixing device according to claim 1, characterized in that, The stirring blades are any one or a combination of a flat paddle blade, an inclined paddle blade, a disk turbine blade or a helical blade; wherein, the disk turbine blade is disposed at the lower part of a rotatable shaft, and / or, the flat paddle blade, the inclined paddle blade and the helical blade are disposed at the upper part and / or the middle part of the stirring shaft.

5. The mixing device according to claim 1, wherein The filter element and the air distribution pipe are of a split structure; and / or, the filter element and the air distribution pipe are connected by welding or a connecting member.

6. The mixing device according to claim 1, characterized in that The filter element is of an arc-shaped structure, the outer diameter of the filter element is the same as the outer diameter of the air distribution pipe, and the inner diameter of the filter element is the same as the inner diameter of the air distribution pipe; and / or, the wall thickness of the filter element is 0.5 mm to 20 mm; and / or, the aperture of the diffusion hole is 1 μm to 1000 μm.

7. The mixing device according to claim 1, characterized in that, The number of the filter elements is multiple, and the multiple filter elements are arranged at intervals along the axial direction of the air distribution pipe. Adjacent two of the filter elements are connected through the sub-pipe bodies; and / or, the multiple filter elements are respectively arranged on two sides or the same side with respect to the axial direction of the air distribution pipe.

8. The mixing device according to claim 1, wherein The air distribution pipe is any one of a semi-ring, a ring, an elliptical ring or a polygonal ring; and / or, The filter element is at least one of a filter mesh element, a wire mesh element, a screen mesh element, a sintered mesh element, a sintered felt element, a powder sintered element or a membrane filter element.

9. The mixing device according to any one of claims 1-8, characterized in that It further includes a heater, and the heater is disposed inside and / or outside the tank body for adjusting the temperature of the tank body and the reaction medium inside it; The heater is selected from a coil heat exchanger, a shell and tube heat exchanger, a spiral tube heat exchanger or an outer wall jacket heat exchanger.

10. The mixing device according to any one of claims 1-8, characterized in that, An air inlet pipe communicating with the air distribution pipe is further disposed below the tank body for introducing gas; and / or, The mixing device further includes a support member disposed at the bottom of the tank body for supporting the air diffusion structure.

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