CN115722098A - Push-down stirring paddle and stirring device - Google Patents

Abstract

The invention discloses a downward-pressing type stirring paddle and a stirring device, wherein the stirring paddle comprises a stirring shaft, n blades are arranged at intervals along the circumferential wall of the stirring shaft, and downward-pressing included angles a are respectively formed between the profile surfaces of the blades and the plane where the axis of the stirring shaft is located _i ，i=1‑n,a _i <90 degrees; a plurality of through holes are distributed on the contour surface of the paddle. The invention can effectively eliminate the dead zone of the flow, improve the uniformity of the temperature field, prevent the inactivation of cells caused by local overheating, comprehensively improve the heat utilization efficiency and the cell activity of the fermentation tank, shorten the reaction time while improving the stirring efficiency, and improve the yield and the quality of finished products. The invention can be used in biological fermentation processes.

Description

Push-down stirring paddle and stirring device

Technical Field

The invention belongs to the field of stirring equipment, and particularly relates to a downward-pressing type stirring paddle and a stirring device.

Background

In the production of biological products, the primary factor affecting the quality of the product is the fermenter, and the paddles are an important component of the fermenter. The existing stirring paddle has the following main defects: 1. has larger shearing force, and leads the loss of the biological fine particles to be larger. 2. Dead zones exist in the flow of liquid flow formed by stirring, the thermal field is not uniform, and local overheating causes deactivation. 3. Foams are easy to generate in the stirring process, and accurate monitoring of parameters such as liquid level and the like is not facilitated. 4. The stirring efficiency and the energy consumption have the problems of high efficiency and high energy consumption, and the high efficiency and the low consumption cannot be compatible with each other, which is a technical problem which cannot be overcome in the industry.

In addition, the stirring paddle with the existing structure is easy to loose connection between the stirring shaft and the power shaft in the long-time high-speed rotation process, and the normal work of the stirring paddle is seriously influenced.

Disclosure of Invention

The object of the present invention is to provide a downward-pressing type stirring paddle, which solves the above mentioned drawbacks of the background art.

In order to achieve the above object, in a first aspect, the present invention provides a downward-pressing type stirring paddle, including a stirring shaft, n blades are arranged at intervals along a circumferential wall of the stirring shaft, and downward-pressing included angles a are respectively formed between profile surfaces of the blades and a plane where an axis of the stirring shaft is located _i ，i=1-n,a _i <90 degrees; and a plurality of through holes are distributed on the contour surface of the blade.

Further, the total area of the through holes on the paddle accounts for 30% -50% of the area of the paddle, and the distance between every two adjacent through holes is equal.

Further, when n is more than or equal to 2, the arrangement directions of the blades on the stirring shaft are the same and a _i Equal, i =1-n.

Further, when n is larger than or equal to 2, the blades (1) are uniformly distributed in the circumferential direction.

Further, the paddle has a mirror-finished surface.

Further, the edge of the paddle and the edge of the orifice of each through hole have a rounded corner structure.

Further, i =3, a _i =45º。

Furthermore, the upper end of the stirring shaft is detachably connected with the power shaft through a self-made coupler.

Furthermore, the inner wall of the shaft hole of the coupler is axially provided with at least one limiting groove, the peripheral wall of the upper end of the stirring shaft is axially provided with at least one positioning rib, and the positioning ribs and the limiting grooves are in one-to-one correspondence assembly relation.

Furthermore, at least one through hole is radially formed in the peripheral wall of the upper end of the stirring shaft, at least one pair of coaxial fixing holes are formed in the peripheral wall of the coupler, and a bolt sequentially penetrates through one fixing hole, the through hole and the other fixing hole and then fixes the stirring shaft and the coupler into a whole through a nut.

In a second aspect, the invention provides a stirring device, which comprises the downward-pressing type stirring paddle and a motor in any technical scheme of the first aspect; the stirring shaft is connected to an output shaft of the motor.

Compared with the prior art, the invention has the beneficial effects that: the device effectively eliminates flowing dead zones, improves the uniformity of a temperature field, prevents cells from being inactivated due to local overheating, comprehensively improves the heat utilization efficiency and the cell activity of the fermentation tank, shortens the reaction time while improving the stirring efficiency, and improves the yield and the quality of finished products. The invention can be used in biological fermentation processes.

Drawings

FIG. 1 is a schematic structural view of one embodiment of a stirring paddle according to the present invention;

FIG. 2 is a schematic structural view of one embodiment of a stirring paddle according to the present invention;

FIG. 3 isbase:Sub>A sectional view taken along line A-A of FIG. 2;

FIG. 4 is a top view of FIG. 2;

FIG. 5 is an exploded view of the assembly of the stirring shaft and the shaft coupling of one embodiment of the stirring paddle of the present invention;

FIG. 6 is a schematic view of an assembly structure of a coupling and a bolt in an embodiment of the stirring paddle of the present invention;

FIG. 7 is an enlarged view of a portion circled at A in FIG. 3;

FIG. 8 is a schematic structural view of an embodiment of the stirring device of the present invention.

Reference numbers in the figures: 1-blade, 2-through hole, 3-stirring shaft, 31-positioning rib, 32-through hole, 4-coupler, 41-shaft hole, 42-limiting groove, 43-fixing hole, 5-bolt, 51-nut, 6-power shaft and 7-motor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described herein are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention without making any creative effort, belong to the protection scope of the invention.

As shown in figure 1, one embodiment of the downward-pressing stirring paddle of the invention is used for a biological fermentation process, and comprises a stirring shaft 3, wherein n blades 1 are arranged at intervals along the peripheral wall of the stirring shaft 3, and downward-pressing included angles a are respectively formed between the profile surfaces of the blades 1 and the plane where the axis of the stirring shaft 3 is located _i ，i=1-n,a _i <90 degrees; the contour surface of the paddle 1 is provided with a plurality of through holes 2. The profile surface is a surface for pushing the mixture in the stirring tank to flow in the stirring process, and can be a plane or a curved surface. When curved, it is preferably a streamlined curved surface having a uniform radius of curvature. A pressing included angle a is formed between the contour surface and the plane where the axis of the stirring shaft 3 is positioned _i The explanation is as follows: when the contour surface is a plane, the included angle a is pressed down _i Namely, the included angle between the projection straight line formed by the projection of the plane on the projection plane vertical to the plane and the axis of the stirring shaft 3 is an acute angle. When the profile surface is a curved surface, the pressing included angle a _i Namely, the included angle between the tangent line of the plane at the midpoint of the projection curve formed by the projection on the projection plane perpendicular to the plane and the axis of the stirring shaft 3 is an acute angle. It is noted that the angle is in the direction of travel of the blade 1 so as to create a downforce. Specifically, as shown in fig. 1, the stirring shaft 3 rotates clockwise, and since the blade 1 inclines towards the advancing direction of the rotation of the stirring shaft 3, that is, the top end of the blade 1 inclines towards the advancing direction relative to the bottom end, the whole profile surface of the blade 1 inclines downwards, a certain downward pressure is formed on the mixture in the stirring tank during rotation, that is, the stirred mixture flows clockwise along with the clockwise rotation of the blade 1, and also continuously rolls downwards and permeates to form a vortex through the downward pressure during the flowing process, which is helpful for breaking up and eliminating the foam or air bubbles formed during the stirring process, and makes the different substances in the mixture fully contact, effectively eliminating the dead zone of the flowing, increasing the temperature, and effectively eliminating the dead zone of the flowing processThe uniformity of the field prevents cells from being inactivated by local overheating, comprehensively improves the heat utilization efficiency and the cell activity of the fermentation tank, shortens the reaction time while improving the stirring efficiency, and improves the yield and the quality of finished products. The through holes 2 distributed on the profile surface of the blade 1 can enable a part of the mixture to reversely pass through the blade 1 in the flowing process (namely, the direction is opposite to the direction that the blade 1 pushes the mixture to flow clockwise), and the reverse liquid flow and the forward liquid flow form turbulent flow after colliding, so that the different substances are diffused mutually, the meeting probability of the different substances in the mixture can be increased undoubtedly, and the stirring effect is further improved. The size and the number n of the blades 1 can be determined according to actual needs, particularly need to be adapted to the size of the stirring tank, and can be 1 or more. Pressing included angle a _i Can be determined according to actual needs, when the number of the blades 1 is more than 1, the pressing included angle a of each blade 1 _i May be the same or different. Different pressing included angles a _i Relative to the same angle a of depression _i More irregular turbulence can be formed, which can improve the stirring effect to a certain extent, but can also increase the stirring resistance. The arrangement mode, the aperture size and the number of the through holes 2 can be determined according to actual needs, and particularly the through holes are required to be adapted to the size of the stirring tank. The number or the area of the through holes 2 determines the size of the reverse liquid flow, preferably, the total area of a plurality of through holes 2 on one blade 1 accounts for 30-50% of the area of the blade 1, and the intervals among the through holes 2 are equal. The flow rate of the reverse liquid flow formed in the way is equivalent to that of the forward liquid flow, and the turbulence formed after collision can enable the foreign matters in the reverse liquid flow to be in contact reaction more uniformly, so that the stirring effect is improved.

In one embodiment, when n is more than or equal to 2, the arrangement directions of the blades 1 on the stirring shaft 3 are the same and a _i Equal, i =1-n. The laying direction is the same, i.e. the pitch direction of each blade 1 is the same. a is _i Equal, i.e. the angle of inclination is the same. The blades 1 with the same inclination direction can form liquid flow with stable flow speed, reduce stirring resistance and save energy. The same effect is achieved with the same inclination angle.

In one embodiment, when n is larger than or equal to 2, each blade 1 is uniformly distributed in the circumferential direction. The blades 2 are uniformly distributed along the circumferential direction of the stirring shaft 3 at equal intervals, so that stable liquid flow is formed, stirring resistance is reduced, and energy is saved.

In one embodiment, the blade 1 has a mirror-finished surface. The smooth surface can reduce the shearing force of the blade 1 to living cells in the mixture, reduce the physical damage to biological fine particles such as cells and the like in the stirring process and is beneficial to maintaining the biological activity of the mixture after stirring.

In one embodiment, the edge of the paddle 1 and the edge of the aperture of each through hole 2 have a round corner structure, and are polished. Such rounded corners may further reduce the shear force of the paddle 1 on living cells in the mixture.

In one embodiment, said i =3, said a _i And (5) =45 ℃. As shown in fig. 4, 3 blades 1 are uniformly distributed on the stirring shaft 3 at intervals of 120 degrees, and the downward pressing included angle a of each blade 1 _i Are all at 45 ℃. The stirring paddle based on 3 blades 1 can adapt to most working conditions, more than 3 blades inevitably increase energy consumption, and less than 3 blades are not beneficial to the formation of stable liquid flow, so that the stirring efficiency is influenced, namely, the configuration can give consideration to high efficiency and energy conservation. Through fluid simulation calculation, the comprehensive mixing effect of the stirring thrust and the downward pressure on the dissimilar materials can be improved to the maximum extent by the inclination angle of 45 degrees.

In one embodiment, as shown in fig. 2-7, the upper end of the stirring shaft 3 is detachably connected with the power shaft 6 through a self-made coupling 4. Specifically, at least one limiting groove 42 is axially arranged on the inner wall of the shaft hole 41 of the coupler 4, at least one positioning rib 31 is axially arranged on the circumferential wall of the upper end of the stirring shaft 3, and the positioning rib 31 and the limiting groove 42 have a one-to-one corresponding assembly relationship. The circumferential wall of the upper end of the stirring shaft 3 is radially provided with at least one through hole 32, the circumferential wall of the coupling 4 is provided with at least one pair of coaxial fixing holes 43, and the bolt 5 sequentially penetrates through one fixing hole 43, the through hole 32 and the other fixing hole 43 and then fixes the stirring shaft 3 and the coupling 4 into a whole by using a nut 51. The detachable shaft coupling structure facilitates the replacement of the stirring paddle shown in fig. 1 (hereinafter referred to as the "stirring paddle"), and enables the connection between the stirring shaft 3 and the power shaft 6 of the stirring paddle to be difficult to loosen through the position limiting structure of the positioning rib 31 and the limiting groove 42, thereby improving the overall reliability.

As shown in FIG. 8, an embodiment of the stirring apparatus of the present invention comprises a stirring paddle and a motor 7 as described in any of the embodiments of the above-mentioned downward-pressing stirring paddle for biological fermentation; the stirring shaft 3 of the stirring paddle is connected to the output shaft of the motor 7 to provide power for the stirring paddle. The technical effect of the stirring paddle is also the technical effect of the stirring device, and the details are not repeated here.

The control software related to the invention adopts the prior art.

Although a plurality of embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that a variety of changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (11)

1. The downward-pressing stirring paddle is characterized by comprising a stirring shaft (3), n blades (1) are arranged at intervals along the peripheral wall of the stirring shaft (3), and downward-pressing included angles a are formed between the contour surface of each blade (1) and the plane where the axis of the stirring shaft (3) is located _i ，i=1-n,a _i <90 degrees; the profile surface of the paddle (1) is provided with a plurality of through holes (2).

2. The downward-pressing stirring paddle according to claim 1, wherein the total area of the plurality of through holes (2) on the paddle (1) accounts for 30-50% of the area of the paddle (1), and the distance between every two adjacent through holes (2) is equal.

3. The downward-pressing stirring paddle according to claim 1, wherein when n is more than or equal to 2, the arrangement direction of each blade (1) on the stirring shaft (3) is the same and a is _i Equal, i =1-n.

4. The downward-pressure stirring paddle according to claim 1, wherein when n is more than or equal to 2, each paddle (1) is uniformly distributed in the circumferential direction.

5. The down-pressure agitator paddle according to claim 1, wherein the paddle (1) has a mirror-finished surface.

6. The down-pressure mixing paddle according to claim 1, wherein the edge of the paddle (1) and the aperture edge of each through-hole (2) have a rounded configuration.

7. The down-pressure paddle according to claim 3, wherein i =3, a _i =45º。

8. The downward-pressing stirring paddle according to claim 1, wherein the upper end of the stirring shaft (3) is detachably connected with the power shaft (6) through a self-made coupling (4).

9. The downward-pressing stirring paddle according to claim 8, wherein the inner wall of the shaft hole (41) of the coupler (4) is axially provided with at least one limiting groove (42), the peripheral wall of the upper end of the stirring shaft (3) is axially provided with at least one positioning rib (31), and the positioning rib (31) and the limiting groove (42) have a one-to-one corresponding assembly relationship.

10. The downward-pressing type stirring paddle according to claim 9, wherein the circumferential wall of the upper end of the stirring shaft (3) is radially provided with at least one through hole (32), the circumferential wall of the coupling (4) is provided with at least one pair of coaxial fixing holes (43), and the bolt (5) sequentially passes through one fixing hole (43), the through hole (32) and the other fixing hole (43) and then fixes the stirring shaft (3) and the coupling (4) into a whole by using a nut (51).

11. A mixing apparatus, characterized by comprising a downward-pressure mixing paddle according to any of claims 1-10 and a motor (7); the stirring shaft (3) is connected to an output shaft of the motor (7).

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