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Novel elastic stirring paddle capable of improving fluid mixing effect

A technology of fluid mixing and paddle stirring, which is applied in the field of paddle stirring, can solve the problems of low fluid mixing efficiency and insufficient mixing of flow field structure in stirred reactors, and achieve increased chaotic mixing degree, strong cutting effect, and improved turbulence degree Effect

Inactive Publication Date: 2018-07-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The research shows that the traditional rigid impeller is easy to form a chaotic mixing zone and a mixing isolation zone in the flow field, and there is a relatively stable flow field structure interface between the chaotic mixing zone and the mixing isolation zone, and the flow field structures are not fully mixed. Leads to less efficient fluid mixing in stirred reactors

Method used

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  • Novel elastic stirring paddle capable of improving fluid mixing effect
  • Novel elastic stirring paddle capable of improving fluid mixing effect
  • Novel elastic stirring paddle capable of improving fluid mixing effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Such as figure 1 and figure 2 As shown, a novel elastic stirring paddle for improving fluid mixing effect is characterized in that it includes a stirring shaft 2, a rigid stirring paddle 4, a ring 5, a spring 6 and a connecting device 7.

[0037] The stirring shaft 2 is a cylindrical structure.

[0038] The connection device 7 is a cylindrical structure with upper and lower openings and a hollow interior. The connecting device 7 is sleeved on the stirring shaft 2 . The inner diameter of the connecting device 7 matches the outer diameter of the stirring shaft 2 , and the connecting device 7 can be fixed on the stirring shaft 2 or can slide freely on the stirring shaft 2 .

[0039] Three connecting devices 7 are sheathed on the outer wall of the stirring shaft 2 . The stirring shaft 2 is divided into three layers by the connecting device 7 . The connecting device 7 on the upper layer and the lower layer of the stirring shaft 2 is fixed on the outer wall of the stirr...

Embodiment 2

[0049] As described in Example 1, a novel elastic stirring paddle that improves fluid mixing effect, its numerical value is as follows:

[0050]①In the initial state, the length of the spring 6 is L, the distance between the lower edge of the upper rigid paddle 4 and the upper edge of the adjacent middle rigid paddle 4 is S, L=(0.75~1.2 ) × S.

[0051] When the length of the spring 6 is too short, the "sweeping" range of the blade is reduced, the vibration behavior of the spring is weakened, and it is difficult to transmit the energy of the blade to the far distance of the flow field;

[0052] When the length of the spring 6 is too long, the "sweeping" range of the blade increases, the vibration behavior of the spring increases, but the rotation resistance of the blade increases.

[0053] When the length L of the spring 6=(0.75˜1.2)×S, the mixing effect of the system is better.

[0054] ② The wire diameter d of the spring 6 is 0.3-2mm.

[0055] The wire diameter of the spri...

Embodiment 3

[0070] The stirring paddle among the embodiment 1 is carried out performance test:

[0071] The stirring shaft 2 is driven by the motor 1 and extends into the stirring tank 3 to rotate.

[0072] The stirring tank 3 is a hollow cylinder tank with one end open and one end closed; the diameter of the stirring tank 3 is 0.19m, and the height of the tank is 0.30m;

[0073] The solution in the stirring tank 3 is 0.8% sodium carboxymethylcellulose solution, and the liquid height is 0.20m;

[0074] The stirring speed is 120rpm;

[0075] The mixing time was measured by the acid-base decolorization test to characterize the mixing performance of the impeller. The experimental results are shown in Table 1.

[0076] Table 1

[0077]

[0078] As can be seen from the experimental results in Table 1, under the same stirring speed condition, the elastic stirring paddle disclosed by the present invention is the same as image 3 Compared to the prior art shown, the mixing time of the sys...

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Abstract

The invention discloses a novel elastic stirring paddle capable of improving fluid mixing effect. The novel elastic stirring paddle capable of improving fluid mixing effect comprises a stirring shaft,rigid stirring blades, rings, springs, and connecting devices; the novel elastic stirring paddle is at least composed of three layers including an upper layer, a middle layer, and a lower layer; therigid stirring blades of the upper layer and the rigid blades of the lower layer are fixedly arranged on the stirring shaft; the middle layer is capable of slide upward and downward; the rigid stirring blades of the three layers are connected with cylindrical spiral compression springs through the rings; the novel elastic stirring paddle is driven by a motor to rotate in a stirring tank, so that fluid is provided with mechanical energy, and the mixing process of materials in the stirring tank is reinforced. Under the interacting effect of the stirring shaft with the fluid, repeat contraction motion of the springs is realized, so that the middle layer rigid stirring blades are capable of rotating with the stirring shaft, and sliding upward and downward, the mixing isolation region of fluidis destroyed, fluid turbulence degree is increased, fluid chaotic mixing degree is increased; and in addition, the cutting effect on fluid is improved because of the structure characteristics of the cylindrical spiral compression springs, so that the structure interface of the fluid in the stirring tank can be destroyed more effectively.

Description

technical field [0001] The invention relates to the field of stirring paddles, in particular to a novel elastic stirring paddle for improving fluid mixing effect. Background technique [0002] Mechanically stirred reactors are widely used in chemical, petrochemical, light industry, pharmaceutical, metallurgy, water treatment and other industries. quality and increase production efficiency. [0003] As one of the important core components of the stirred reactor, the stirring paddle can give the fluid the required appropriate energy, thereby promoting the evolution, formation, displacement of the multi-scale structure of the flow field and the transfer of energy and matter between the multi-scale flow field structures. However, less than 5% of the total mechanical input of the stirred reactor to the flow field through the stirring paddle is actually used for the internal mixing of the fluid, and it is often necessary to increase the stirring speed to achieve the required mixi...

Claims

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Application Information

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IPC IPC(8): B01F7/00
CPCB01F27/0542
Inventor 刘作华熊黠陶长元谷德银刘仁龙邱发成杜军范兴谢昭明孔令峰吴丙山唐金晶许传林张柱杨义王靓王闯李兵许恢琴
Owner CHONGQING UNIV
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