Stirrer applicable to citric acid fermentation by aspergillus niger

Abstract

The stirrer comprises a hub arranged on the periphery of a stirring shaft in a fermentation tank, a rotating disc is installed on the outer side of the hub, a plurality of paddles are evenly arranged on the periphery of the rotating disc, and each paddle comprises an upper arc-shaped plate and a lower arc-shaped plate which are oppositely arranged on the upper side and the lower side of the rotating disc; and the inner arc surfaces of the upper arc-shaped plate and the lower arc-shaped plate face the rotating direction of the turntable. According to the stirrer disclosed by the utility model, the flowing direction of fermentation liquor in the fermentation tank is changed by utilizing the inner arc surface of the arc-shaped plate, and the generated shearing force is small, so that aspergillus niger hyphae can form mycelium pellets more easily, and the fermentation efficiency is improved; one end, far away from the rotating disc, of the lower arc-shaped plate of the paddle faces the bottom of the fermentation tank, fermentation liquor flows to the bottom of the fermentation tank during stirring, and solid particle deposition is avoided by impacting the bottom of the fermentation tank through the fermentation liquor; the stirrer guides fermentation liquor to the upper end and the lower end of the fermentation tank through the upper arc-shaped plate and the lower arc-shaped plate respectively, so that backflow is formed in the upper layer and the lower layer in the fermentation tank, and comprehensive stirring of the fermentation liquor is effectively promoted.

Description

Technical Field

[0001] This utility model relates to the field of bioengineering technology, and in particular to a stirrer suitable for Aspergillus niger fermentation of citric acid. Background Technology

[0002] Citric acid, as an important organic acid, is widely used in food, medicine, chemical and other fields. Industrially, citric acid is mainly produced through microbial fermentation, with Aspergillus niger being widely used for large-scale citric acid production due to its high citric acid yield.

[0003] However, traditional fermentation processes present several technical challenges, particularly in the design of the agitator. In the process of producing citric acid using Aspergillus niger fermentation, corn saccharification liquid and corn grits are commonly used as the fermentation medium. This process suffers from a viscous liquid and a high accumulation of solid particles at the bottom, affecting the dissolved oxygen level of the fermentation broth. Furthermore, traditional agitators exert significant shear force, which is detrimental to the formation of mycelial balls by Aspergillus niger mycelia, thus impacting fermentation efficiency.

[0004] Therefore, in view of the shortcomings of the existing technology, it is necessary to design a stirrer suitable for Aspergillus niger fermentation of citric acid to solve the above problems.

[0005] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solution of this utility model and facilitating the understanding of those skilled in the art. It should not be assumed that the above content is known to those skilled in the art simply because it has been described in the background section of this utility model. Utility Model Content

[0006] To overcome the shortcomings of the prior art, the present invention aims to disclose a stirrer suitable for Aspergillus niger fermentation of citric acid, which solves the problems of solid particle accumulation at the bottom of the fermentation tank and excessive shear force of the stirrer affecting the formation of mycelial balls by Aspergillus niger mycelia during the fermentation production of citric acid.

[0007] This utility model discloses a stirrer suitable for Aspergillus niger fermenting citric acid, including a hub set on the outer periphery of a stirring shaft inside a fermentation tank, a turntable installed on the outer side of the hub, and a number of blades evenly arranged on the outer periphery of the turntable. The blades include an upper arc plate and a lower arc plate arranged opposite each other on the upper and lower sides of the turntable. The inner arc surfaces of the upper arc plate and the lower arc plate face the rotation direction of the turntable. One end of the upper arc plate and the lower arc plate are symmetrically connected to the upper and lower sides of the turntable, and the end of the lower arc plate away from the turntable is set towards the bottom of the fermentation tank.

[0008] Preferred technical solution: The upper arc plate and the lower arc plate have the same shape and size.

[0009] Preferably, the upper arc-shaped plate and the lower arc-shaped plate are 1 / 4 circular arc-shaped plates.

[0010] Preferably, the upper arc-shaped plate and the lower arc-shaped plate are connected with the rotating disc by the connecting plate.

[0011] Preferably, the number of the upper arc-shaped plates and the lower arc-shaped plates is six.

[0012] Preferably, the rotating disc is a circular disc, and the hub is located at the axis of the rotating disc.

[0013] Preferably, the upper arc-shaped plate and the lower arc-shaped plate can be integrally formed.

[0014] By means of the above technical scheme, the present application has the following beneficial effects compared with the prior art:

[0015] 1) Small shear force of the paddle: the stirrer changes the flow direction of the fermentation broth in the fermentation tank by the inner arc surface of the arc-shaped plate, the cutting range of the paddle is small, the shear force generated is small, the Aspergillus niger mycelium is more likely to form a mycelial ball, and the fermentation efficiency is improved.

[0016] 2) Avoiding deposition of raw materials: the end of the lower arc-shaped plate away from the rotating disc is arranged towards the bottom of the fermentation tank, which makes the fermentation broth flow towards the bottom of the fermentation tank during stirring, and avoids the deposition of solid particles by impacting the bottom of the fermentation tank, thereby improving the dissolved oxygen level of the fermentation broth.

[0017] 3) Uniform stirring: the stirrer guides the fermentation broth to the upper and lower ends of the fermentation tank by the upper arc-shaped plate and the lower arc-shaped plate, respectively, so that backflow is formed in the upper and lower layers of the fermentation tank, which effectively promotes the overall stirring of the fermentation broth and improves the dissolved oxygen level of the fermentation broth. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0019] Figure 1 It is a front view of the stirrer suitable for Aspergillus niger fermentation of citric acid of the present application.

[0020] Figure 2 It is a top view of the stirrer suitable for Aspergillus niger fermentation of citric acid of the present application.

[0021] Figure 3 It is a shaft side view of the stirrer suitable for Aspergillus niger fermentation of citric acid of the present application.

[0022] In the above drawings, 1, hub; 2, rotating disc; 3, paddle; 31, upper arc plate; 32, lower arc plate; 4, connecting plate. DETAILED DESCRIPTION

[0023] The above and other advantages and effects of the present application will become readily apparent to those skilled in the art from the following description of specific embodiments, taken in conjunction with the accompanying drawings.

[0024] It should be noted that the terms "first", "second", and the like in the description and in the claims of the present application, as well as above-mentioned drawings, are intended to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that the data thus used can be interchanged, where appropriate, to describe the embodiments of the present application herein. In addition, the terms "comprising" and "having" and their synonyms, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or apparatus that includes a list of steps or units is not necessarily limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products or apparatus.

[0025] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a particular orientation, or to be constructed and operated in a particular orientation.

[0026] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0027] In addition, the terms "mounting", "setting", "provided with", "connecting", "connected", "sleeved", "attached" should be broadly understood. For example, "connected" can be fixedly connected, detachably connected, or integrally constructed; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For example, "attached" can be completely attached or partially attached. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0028] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] Embodiments:

[0030] As shown in Figure 1 , Figure 2 and Figure 3 , the utility model discloses a kind of stirrers suitable for aspergillus niger fermentation citric acid, including the wheel hub 1 of being arranged in the outer periphery of stirring shaft in fermentation tank, wheel hub 1 outside is equipped with carousel 2, the outer periphery of carousel 2 is uniformly arranged with six groups of paddle 3, paddle 3 includes the upper arc plate 31 and lower arc plate 32 of being oppositely arranged on the upper and lower sides of carousel 2, the inner arc surface of upper arc plate 31 and lower arc plate 32 is all towards the direction of rotation of carousel 2, one end of upper arc plate 31 and lower arc plate 32 is symmetrically connected on the upper and lower sides of carousel 2, and the end of lower arc plate 32 away from carousel 2 is towards the bottom of fermentation tank.

[0031] The utility model uses method and principle as follows: when using, wheel hub 1 and the carousel 2 of its outer periphery in horizontal direction are rotated by stirring shaft, in the process of rotation, paddle 3 is moved on the motion path by upper arc plate 31 and lower arc plate 32, and the inner arc surface of upper arc plate 31 and lower arc plate 32 makes fermentation broth to be shunted to the upper and lower sides, to make fermentation broth to scour the upper and lower ends of fermentation tank, to make fermentation broth to form longitudinal reflux on the upper and lower sides of stirrer in fermentation tank, so that fermentation broth is fully stirred, and simultaneously, because stirring is shunted to the upper and lower sides by paddle 3, the area of paddle 3 distribution is small, and the range of fermentation broth directly contacted during stirring is small, can effectively reduce the influence of shear force on aspergillus mycelium to form mycelium ball, to further improve the efficiency of fermentation.

[0032] As shown in Figure 1 , Figure 2 and Figure 3 , to improve the stability when paddle agitates, the shape and size of upper arc plate 31 and lower arc plate 32 are same, so that the stress of the upper and lower sides of paddle 3 reaches balance, to improve the stability of paddle 3 movement.

[0033] As shown in Figure 1 , Figure 2 and Figure 3 , to make stirring more fully, upper arc plate 31 and lower arc plate 32 are all 1 / 4 circle arc plate, and the vertical of upper arc plate 31 and lower arc plate 32 away from carousel 2 points to the bottom and top of fermentation tank, when paddle 3 agitates, to make the impact effect of fermentation broth to the upper and lower ends of fermentation tank increase, to further promote the overall flow of fermentation broth in fermentation tank, to improve the level of dissolved oxygen, to improve the efficiency of fermentation.

[0034] AsFigure 1 、 Figure 2 and Figure 3 As shown in

[0035] As shown in Figure 1 、 Figure 2 and Figure 3 To further improve the stability of the paddle stirring, the disc 2 is a circular disc, and the hub 1 is located at the center of the disc 2, so that the circumferential force of the hub 1 is balanced during stirring.

[0036] Finally, it should be noted that the above is only the preferred embodiments of the present application, and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A kind of agitator suitable for aspergillus niger fermentation citric acid, including the hub (1) being arranged in the stirring shaft outer periphery of fermentation tank, the rotating disc (2) is installed on the outer side of the hub (1), the outer periphery of the rotating disc (2) is uniformly arranged with several paddles (3), it is characterized in that: The paddle (3) comprises an upper arc plate (31) and a lower arc plate (32) oppositely arranged on the upper and lower sides of the rotating disc (2), the inner arc surfaces of the upper arc plate (31) and the lower arc plate (32) are both directed to the rotating direction of the rotating disc (2), one end of the upper arc plate (31) and the lower arc plate (32) is symmetrically connected to the upper and lower sides of the rotating disc (2), and the end of the lower arc plate (32) away from the rotating disc (2) is arranged towards the bottom of the fermentation tank.

2. A stirrer suitable for Aspergillus niger fermentation of citric acid as claimed in claim 1, wherein: The upper arc plate (31) and the lower arc plate (32) are the same in shape and size.

3. The stirrer as claimed in claim 2, wherein the stirrer is suitable for Aspergillus niger for fermentation of citric acid. The upper arc plate (31) and the lower arc plate (32) are both 1 / 4 circular arc plates.

4. The stirrer as claimed in claim 3, wherein the stirrer is suitable for Aspergillus niger for fermentation of citric acid. The upper arc plate (31) and the lower arc plate (32) are connected with the rotating disc (2) by a connecting plate (4).

5. An agitator suitable for Aspergillus niger fermentation of citric acid as claimed in claim 4, wherein: The number of the upper arc plate (31) and the lower arc plate (32) is six groups.

6. The stirrer as claimed in claim 1, wherein the stirrer is suitable for Aspergillus niger for fermentation of citric acid. The rotating disc (2) is a disc, and the hub (1) is located at the axis of the rotating disc (2).

7. The stirrer as claimed in claim 1, wherein the stirrer is suitable for Aspergillus niger for fermentation of citric acid. The upper arc plate (31) and the lower arc plate (32) can also be integrally formed.

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