Defoaming device of fermentation tank

Abstract

The utility model relates to the technical field of biological fermentation equipment, in particular to a defoaming device for a fermentation tank, which is arranged in the fermentation tank and comprises a stirring shaft, one end of the stirring shaft is connected with a motor, the motor is positioned outside the fermentation tank, the other end of the stirring shaft is connected with a stirring paddle, a primary defoaming component and a secondary defoaming component, and the secondary defoaming component is positioned outside the fermentation tank. Wherein the stirring paddle, the first-stage defoaming assembly and the second-stage defoaming assembly are arranged in the fermentation tank, and the stirring paddle is located below the first-stage defoaming assembly and the second-stage defoaming assembly. According to the utility model, the stirring shaft rotates to drive the defoaming paddle connected with the stirring cross beam to rotate, so that primary crushing of foam is realized; foam continuously flowing into the corresponding foam accommodating cavities is extruded into fine foam under the action of the first blade group and the second blade group, so that secondary crushing is realized, the defoaming effect is good, and fermentation production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of biological fermentation equipment, in particular to a defoaming device for a fermentation tank. Background Art

[0002] In the process of fermentation production, foaming is a very common phenomenon. Especially in aerobic fermentation, some media will produce a large amount of foam during the fermentation process, especially those with a serious foaming tendency. If the foam is not eliminated in time during the fermentation process, it will occupy a large volume of the tank content, affect the flow rate of auxiliary materials, and thus reduce production efficiency. If the foam escapes from the air outlet, it will not only waste the broth, but also increase the risk of contamination. Therefore, the control and prevention of foam have a great impact on the overall fermentation process, and even directly determine the production output and cost.

[0003] The reasons for foam generation are various, mainly including external forces, microbial metabolism, and culture medium components. According to the influencing factors, it can be divided into the following types: (1) The so-called external force refers to the ventilation volume and the intensity of stirring. As the fermentation progresses, the ventilation volume and stirring rate will gradually increase. The greater the ventilation volume and the stronger the stirring degree, the more foam will be generated; (2) It is related to the properties of raw materials commonly used in the culture medium. Protein raw materials such as peptone, corn steep liquor, yeast powder, and molasses are the main foaming substances, and their foaming ability varies with different varieties, origins, storage, and processing conditions. Sugars themselves have poor foaming ability, but in a rich culture medium, a higher concentration of sugar substances will increase the viscosity of the culture medium and enhance the foaming ability. The higher the protein content in the culture medium, the greater the viscosity, and the higher the stability of the generated bubbles; (3) The more vigorous the growth of the bacteria, the more foam will be generated. When the nutrient matrix in the fermentation broth is consumed in large quantities by the bacteria, the material concentration decreases, and the stability of the bubbles also weakens. In the later stage of fermentation, along with the autolysis of the bacteria, the protein concentration in the fermentation broth increases, and the foaming becomes more and more severe.

[0004] Currently, the more commonly used defoaming methods mainly include two types. One is to add defoamers such as polyethers, natural oils, and silicone oils, and the other is to use mechanical defoaming paddles. Adding defoamers needs to be comprehensively considered according to the characteristics of the fermentation bacteria. Defoamers are relatively expensive and consume a large amount, which will invisibly increase a large amount of production costs. Moreover, adding too much defoamer has a relatively large impact on both fermentation and post-extraction, and the defoamer itself has a certain toxicity, posing a great risk to product quality and safety. Compared with adding defoamers, mechanical defoaming paddles can save production costs, but the traditional serrated mechanical defoaming paddles have a small radial control surface, resulting in uneven defoaming, and when facing sponge-like foam with a high protein content, they cannot achieve the corresponding defoaming effect on fermentation. Summary of the Utility Model

[0005] In view of the above-mentioned deficiencies, the purpose of the present utility model is to provide an antifoaming device for a fermentation tank, which solves the problem of poor antifoaming effect on spongy foam with high protein content.

[0006] To achieve the above purpose, the present utility model provides an antifoaming device for a fermentation tank. The antifoaming device is arranged inside the fermentation tank and includes a stirring shaft. One end of the stirring shaft is connected to a motor, and the motor is located outside the fermentation tank. The other end of the stirring shaft is connected to a stirring paddle, a primary antifoaming component, and a secondary antifoaming component. Among them, the stirring paddle, the primary antifoaming component, and the secondary antifoaming component are arranged inside the fermentation tank, and the stirring paddle is located below the primary antifoaming component and the secondary antifoaming component.

[0007] A stirring crossbeam is connected to the stirring shaft, and a first antifoaming component is connected to the lower part of the stirring crossbeam. The first antifoaming component includes a plurality of antifoaming paddles, and the antifoaming paddles are connected below the stirring crossbeam. The secondary antifoaming component includes two sets of blade groups with the same structure and openings facing the rotation direction of the stirring shaft 1, namely a first blade group and a second blade group. The first blade group includes two symmetrically arranged blades, namely a first upper blade and a first lower blade. A foam accommodating cavity is formed between the first upper blade and the first lower blade, and a plurality of through holes are arranged on the first lower blade.

[0008] As a preferred technical solution, the top end of the antifoaming paddle is vertically connected below the stirring crossbeam. Six antifoaming paddles are provided, with three in a group, symmetrically connected to the stirring crossbeam.

[0009] As a preferred technical solution, the bottom end of the antifoaming paddle is higher than the stirring paddle.

[0010] As a preferred technical solution, the antifoaming paddle includes a vertical rod body, and spiral fins are arranged on the outer side of the vertical rod body.

[0011] As a preferred technical solution, the stirring crossbeam includes a left crossbeam and a right crossbeam. The first blade group is detachably arranged on the left crossbeam, and the second blade group is detachably arranged on the right crossbeam.

[0012] As a preferred technical solution, both the first upper blade and the first lower blade are inclined, so that an opening with an included angle A is formed in the foam accommodating cavity between them, and the included angle A is 25 - 35°.

[0013] As a preferred technical solution, a stainless steel support bar is arranged at the included angle A between the first upper blade and the first lower blade. A groove is arranged on one side of the stainless steel support bar, and the groove is adapted to the stirring crossbeam. Inclined protrusions are arranged on both the upper and lower sides of the stainless steel support bar, and the two protrusions are used to support the first upper blade and the first lower blade.

[0014] As a preferred technical solution, the blades in the first blade group and the second blade group are all fixed on the stirring cross beam by screws.

[0015] As a preferred technical solution, the first upper blade and the first lower blade are inserted on the stirring cross beam.

[0016] As a preferred technical solution, the blades in the first blade group and the second blade group are rectangular.

[0017] The utility model provides a defoaming device for a fermentation tank. By rotating the stirring shaft, the defoaming paddle connected to the stirring cross beam is driven to rotate, so as to realize the primary crushing of foam; during the rotation of the two blade groups, a downward pressure is generated to inhibit the rise of foam, and the continuously rising foam enters the corresponding foam accommodating cavity through the through holes. The foam continuously pouring into the corresponding foam accommodating cavity is squeezed into fine foam under the action of the first blade group and the second blade group, realizing secondary crushing, and then overflows from both sides of the corresponding foam accommodating cavity. The crushed fine foam will enter the fermentation liquid at the lower part of the fermentation tank under the downward pressure of the first blade group and the second blade group, thus achieving an excellent defoaming effect and being beneficial to fermentation production. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of a defoaming device for a fermentation tank according to an embodiment of the utility model;

[0019] Figure 2 is a schematic structural diagram of a primary defoaming component and a secondary defoaming component;

[0020] Figure 3 is a top view of the secondary defoaming component;

[0021] Figure 4 is a sectional view of the first blade group;

[0022] Figure 5 is a schematic structural diagram of a stainless steel support bar;

[0023] Figure 6 is a sectional view of the first blade group in the second embodiment;

[0024] In the figure:

[0025] 1 - stirring shaft, 2 - stirring cross beam, 21 - left cross beam, 22 - right cross beam, 3 - first blade group, 31 - first upper blade, 32 - first lower blade, 4 - second blade group, 5 - through hole, 6 - defoaming paddle, 61 - vertical rod body, 62 - spiral fin, 7 - stirring paddle, 8 - motor, 9 - fermentation tank, 10 - screw, 11 - stainless steel support bar, 111 - groove, 112 - convex part. Detailed Embodiments

[0026] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] Embodiment 1:

[0028] Referring to Figure 1 and Figure 2 , the present utility model provides a defoaming device for a fermentation tank. The defoaming device is arranged in the fermentation tank 9 and includes a stirring shaft 1. One end of the stirring shaft 1 is connected to a motor 8, and the other end of the stirring shaft 1 is connected to a stirring paddle 7, a primary defoaming component and a secondary defoaming component. Among them, the stirring paddle 7, the primary defoaming component and the secondary defoaming component are arranged in the fermentation tank 9, and the motor 8 is located outside the fermentation tank 9. The stirring paddle 7 is located below the primary defoaming component and the secondary defoaming component.

[0029] A stirring cross beam 2 is connected to the stirring shaft 1, and a first defoaming component is connected to the lower part of the stirring cross beam 2. The first defoaming component includes a plurality of defoaming paddles 6. The top ends of the defoaming paddles 6 are vertically connected below the stirring cross beam 2, and the bottom ends of the defoaming paddles 6 are arranged higher than the stirring paddle 7.

[0030] Further, the defoaming paddle 6 includes a vertical rod body 61.

[0031] After the foam in the fermentation tank 9 rises to the position of the defoaming paddle 6, the defoaming paddle 6 rotates with the stirring cross beam 2 to initially break the foam. Therefore, the defoaming paddles 6 should not be too dense. It is preferably set to six, three in a group, and symmetrically arranged below the stirring cross beam 2. The length of the defoaming paddle 6 should not be too long, which can not only avoid collision between the stirring paddle 7 and the defoaming paddle 6, but also avoid material waste.

[0032] In order to further improve the defoaming ability of the defoaming paddle 6, spiral fins 62 are arranged on the outer side of the vertical rod body 61 to assist the vertical rod body 61 in defoaming.

[0033] Of course, the defoaming effect of the defoaming paddle 6 is limited. Especially when encountering high sponge-like foam in the later stage of fermentation, a large amount of foam will still continue to rise. Therefore, a secondary defoaming component is arranged on the stirring cross beam 2.

[0034] Referring to Figures 1 to 3 , the secondary defoaming component includes two sets of blade groups with the openings facing the rotation direction of the stirring shaft 1 and having the same structure, namely a first blade group 3 and a second blade group 4. The first blade group 3 and the second blade group 4 are both provided with foam accommodating cavities for containing foam. The first blade group 3 and the second blade group 4 also generate a downward pressure during rotation to press down the rising foam.

[0035] The stirring cross beam 2 includes a left cross beam 21 and a right cross beam 22. The first blade group 3 is detachably arranged on the left cross beam 21, and the second blade group 4 is detachably arranged on the right cross beam 22. The setting of the detachable structure facilitates the maintenance, disassembly and assembly.

[0036] Specifically, the first blade group 3 includes two symmetrically arranged blades, namely a first upper blade 31 and a first lower blade 32. A foam accommodation cavity is formed between the first upper blade 31 and the first lower blade 32. A number of through holes 5 are arranged on the first lower blade 32, and the aperture of the through holes 5 is 10 cm. The setting of the through holes 5 facilitates the entry of foam into the foam accommodation cavity between the first upper blade 31 and the first lower blade 32.

[0037] See Figure 4 , both the first upper blade 31 and the first lower blade 32 are inclined, so that the foam accommodation cavity between them forms an opening with an included angle A, and the included angle A is 25 - 35°. The setting of the angle A can not only ensure the foam intake, but also maximize the extrusion force of the first upper blade 31 and the first lower blade 32 on the foam entering between them, and better break the foam.

[0038] If the angle A is too large, the foam intake is too large, the extrusion effect is poor, and the resistance during the rotation of the stirring paddle 11 will be increased; if the angle A is too small, the foam intake is too small, and the function of secondary defoaming cannot be achieved. Therefore, the included angle A is preferably 30°.

[0039] The second blade group 4 has the same structure as the first blade group 3, so it will not be elaborated here. The blades in the first blade group 3 and the second blade group 4 are preferably rectangular, with a length of half of the length of the stirring cross beam 2 and a width of 40 cm.

[0040] During the work of the second blade group 4 and the first blade group 3, some rising foam will enter the corresponding foam accommodation cavities of the first blade group 3 and the second blade group 4 through the through holes 5 on the two first lower blades 32. During the rotation of the stirring shaft 1, the foam continuously pouring into the corresponding foam accommodation cavities is squeezed into fine foam under the action of the blades in the first blade group 3 and the second blade group 4, realizing secondary crushing, and then overflows from both sides of the corresponding foam accommodation cavity. The broken fine foam will enter the fermented feed liquid at the lower part of the fermentation tank 9 along with the downward pressure of the first blade group 3 and the second blade group 4, thus achieving an excellent defoaming effect and being beneficial to fermentation production.

[0041] See Figures 1 to 3, the blades in the first blade group 3 and the second blade group 4 are all fixed to the stirring cross beam 2 by screws 10. In order to prevent the angle A between the first upper blade 31 and the first lower blade 32 from changing after long-term use, a stainless steel support bar 11 can be provided at the angle A between the first upper blade 31 and the first lower blade 32. See Figure 4 and Figure 5 . A groove 111 is provided on one side of the stainless steel support bar 11 for adapting to the stirring cross beam 2. Inclined protrusions 112 are provided on both the upper and lower sides of the stainless steel support bar 11, and the two protrusions 112 play a role in supporting the first upper blade 31 and the first lower blade 32. Screw mounting holes are provided on the two protrusions 112, and screw mounting holes are also provided on the blades in the first blade group 3 and the second blade group 4. Taking the installation of the first upper blade 31 on the stirring cross beam 2 as an example, the screw 10 is passed through the screw mounting holes on the corresponding protrusion 112 of the first upper blade 31 and the stainless steel support bar 11 to fix the first upper blade 31 on the stirring cross beam 2. The installation method of the first lower blade 32 is the same as that of the first upper blade 31, so it will not be elaborated here.

[0042] Embodiment 2:

[0043] See Figure 6 , the present application also provides a defoaming device for a fermentation tank, which is different from the above embodiment in that: the first upper blade 31 and the first lower blade 32 can also be fixed to the stirring cross beam 2 by a plug-in method. The plug-in method can be realized by using the existing technology.

[0044] The present utility model provides a defoaming device for a fermentation tank. By rotating the stirring shaft, the defoaming paddle connected to the stirring cross beam is driven to rotate, realizing the primary crushing of the foam; the two groups of blade groups generate a downward pressure during rotation to inhibit the rise of the foam, and the continuously rising foam enters the corresponding foam accommodating cavity through the through holes. The foam continuously pouring into the corresponding foam accommodating cavity is squeezed into fine foam under the action of the first blade group and the second blade group, realizing secondary crushing, and then overflows from both sides of the corresponding foam accommodating cavity. The crushed fine foam will enter the fermentation liquid at the lower part of the fermentation tank along with the downward pressure of the first blade group and the second blade group, thereby achieving an excellent defoaming effect and being beneficial to fermentation production.

[0045] Of course, the present utility model can also have other various embodiments. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A fermentation tank defoaming device, the defoaming device is arranged in a fermentation tank (9), comprising a stirring shaft (1), one end of the stirring shaft (1) is connected to a motor (8), and the motor (8) is located outside the fermentation tank (9), characterized in that: The other end of the stirring shaft (1) is connected to a stirring paddle (7), a primary defoaming component and a secondary defoaming component, wherein the stirring paddle (7), the primary defoaming component and the secondary defoaming component are arranged in a fermentation tank (9), and the stirring paddle (7) is located below the primary defoaming component and the secondary defoaming component; The stirring shaft (1) is connected to a stirring beam (2), and the lower part of the stirring beam (2) is connected to a first defoaming component, the first defoaming component comprising a plurality of defoaming paddles (6), and the defoaming paddles (6) are connected to the lower part of the stirring beam (2); the secondary defoaming component comprises two groups of blade groups with openings facing the rotation direction of the stirring shaft (1) and having the same structure, namely a first blade group (3) and a second blade group (4); the first blade group (3) comprises two symmetrically arranged blades, namely a first upper blade (31) and a first lower blade (32), a foam containing cavity is formed between the first upper blade (31) and the first lower blade (32), and the first lower blade (32) is provided with a plurality of through holes (5).

2. A fermentation tank defoaming device according to claim 1, characterized in that: The top end of the defoaming paddle (6) is vertically connected to the bottom of the stirring beam (2); therefore, six defoaming paddles (6) are arranged in groups of three and are symmetrically connected to the stirring beam (2).

3. A fermentation tank defoaming device according to claim 1 or 2, characterized in that: The bottom end of the defoaming paddle (6) is arranged higher than the stirring paddle (7).

4. A fermentation tank defoaming device according to claim 3, characterized in that: The defoaming paddle (6) comprises a vertical rod body (61), and a spiral fin (62) is arranged on the outer side of the vertical rod body (61).

5. A fermentation tank defoaming device according to claim 1, characterized in that: The stirring beam (2) comprises a left beam (21) and a right beam (22); the first blade group (3) is detachably arranged on the left beam (21); and the second blade group (4) is detachably arranged on the right beam (22).

6. A fermentation tank defoaming device according to claim 5, characterized in that: The first upper blade (31) and the first lower blade (32) are both arranged obliquely, so that the foam containing cavity therebetween forms an opening with an included angle A, and the included angle A is 25-35 degrees.

7. A fermentation tank defoaming device according to claim 6, characterized in that: A stainless steel support bar (11) is provided at an angle A between the first upper blade (31) and the first lower blade (32); a groove (111) is provided on one side of the stainless steel support bar (11); the groove (111) is adapted to fit the stirring beam (2); and inclined protrusions (112) are provided on both upper and lower sides of the stainless steel support bar (11); the two protrusions (112) are used to support the first upper blade (31) and the first lower blade (32).

8. A fermentation tank defoaming device according to claim 7, characterized in that: The blades in the first blade group (3) and the second blade group (4) are both fixed to the stirring beam (2) by means of screws (10).

9. A fermentation tank defoaming device according to claim 6 or 7, characterized in that: The first upper blade (31) and the first lower blade (32) are plugged into the stirring beam (2).

10. A fermentation tank defoaming device according to claim 6, characterized in that: The blades in the first blade group (3) and the second blade group (4) are rectangular.

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