High-shear-force stirring paddle for centrifugal extractor

Abstract

The utility model discloses a high shear force stirring paddle for a centrifugal extractor, which comprises a stirring shaft and stirring blades fixed on the stirring shaft, the stirring blades comprise a first stirring blade and a second stirring blade, the end face of the first stirring blade and the end face of the second stirring blade are respectively provided with shear teeth which are uniformly distributed, and the shear teeth are uniformly distributed on the stirring shaft. And the shearing teeth are used for shearing liquid flowing through the end surfaces of the stirring blades along with the rotation of the stirring blades. According to the device disclosed by the invention, a plurality of shearing teeth are arranged on the rotating stirring blade, so that the sectioning of mixed liquid in the extraction machine is realized, and meanwhile, the sheared liquid is fully mixed under the stirring of the stirring blade, so that the stirring blade runs at a low speed on the premise of realizing centrifugal separation, the loss probability of the stirring blade is greatly reduced, and the efficiency of the extraction machine is improved. The service life is prolonged; meanwhile, a plurality of layers of stirring blades with opposite inclination angles are arranged, so that liquid in the extraction machine can be fully mixed, and the mixing efficiency in the mixing and mass transfer stage is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal extractors, in particular to a high-shear stirring paddle for a centrifugal extractor. Background Art

[0002] Centrifugal extractors are mainly used for liquid-liquid extraction, organic phase washing and liquid-liquid two-phase separation (oil-water separation) and other processes. Currently, centrifugal extractors are widely used in fine chemicals (post-synthesis processing of pesticides, pharmaceuticals and chemical intermediates), fermentation (organic acids, antibiotic single elements, etc.), hydrometallurgy and environmental protection industries. It is quite different from traditional liquid-liquid extraction and separation equipment in terms of working principle. It is a process intensification equipment with continuous high-speed precision mixing and rapid centrifugal separation. The equipment can be used alone or in multiple stages in series. In industrial applications, it can quickly realize countercurrent extraction and cross-current extraction of different levels.

[0003] The centrifugal extractor mainly includes two working processes, namely mixing and mass transfer and centrifugal separation. The centrifugal extractor can automatically and continuously complete the two processes of mixing and separation. In the mixing and mass transfer stage, after the aqueous phase and the organic phase enter the centrifugal extractor, they are sheared and dispersed into tiny droplets by the high-speed rotating drum or blades, so that the two phases are fully in contact, thereby achieving the purpose of mass transfer. The factors that affect the mass transfer effect are the intensity of mixing, the contact time, the temperature of extraction, and the concentration difference of the substance. The intensity of mixing is the most important factor affecting its mass transfer effect. Although the traditional stirring paddle is equipped with mixing blades and radial blades, the shear force on the extraction mixture is not strong enough. In this way, the traditional centrifugal extractor increases the speed of the blades in order to achieve mixing and mass transfer. Long-term high-speed operation will greatly reduce the service life of the blades. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a high shear force stirring impeller for a centrifugal extractor.

[0005] According to the technical solution provided in the embodiment of the present application, a high-shear-force stirring paddle for a centrifugal extractor comprises a stirring shaft and stirring blades fixed on the stirring shaft, the stirring blades comprising a first stirring blade and a second stirring blade, the end surfaces of the first stirring blade and the second stirring blade are both provided with evenly distributed shearing teeth, and the shearing teeth shear the liquid flowing through the end surfaces of the stirring blades as the stirring blades rotate.

[0006] Furthermore, the second stirring blade is located directly above the first stirring blade, and the first stirring blade and the second stirring blade are inclined in opposite directions, thereby improving the mixing efficiency of the stirring blade.

[0007] Furthermore, a plurality of grooves are provided on the blades of the first stirring blade and the second stirring blade, and the shearing teeth are evenly arranged on the inner end surfaces of the grooves to improve the strength of the shearing teeth to resist the scouring force of the liquid.

[0008] Furthermore, the groove is a rectangular groove, and may also be an arc-shaped groove.

[0009] Furthermore, the groove runs through the end surfaces of the first stirring blade and the second stirring blade, so that the mixed liquid can flow out of the stirring blade directly after shearing, thereby reducing the resistance of the stirring blade.

[0010] Furthermore, the stirring blade is located at the lower end of the stirring shaft.

[0011] Furthermore, a baffle plate and radial blades are provided on the stirring shaft above the stirring blades.

[0012] In summary, the beneficial effects of the present application are as follows: the device of the present application is provided with a plurality of shearing teeth on the rotating stirring blades. During the rotation of the stirring blades, the mixed liquid in the extractor can be cut by the shearing teeth. At the same time, under the stirring of the stirring blades, the sheared liquid is fully mixed, so that the stirring blades can operate at a low speed while achieving centrifugal separation, which greatly reduces the probability of loss of the stirring blades and increases their service life; at the same time, multiple layers of stirring blades with opposite inclination angles are provided, which can fully mix the liquid in the extractor and improve the mixing efficiency in the mixing and mass transfer stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0014] Figure 1 It is a structural schematic diagram of the overall device of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the utility model after the radial blades and baffles are removed;

[0016] Figure 3 This is a schematic diagram of the structure of the stirring blade of the utility model;

[0017] Figure 4 It is a partial enlarged structural schematic diagram of the stirring blade of the utility model.

[0018] Numbers in the figure: stirring shaft-1; stirring blade-2; first stirring blade-21; second stirring blade-22; shearing tooth-3; groove-4. DETAILED DESCRIPTION

[0019] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0020] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0021] A high shear force impeller for a centrifugal extractor, such as Figure 1 and Figure 2 As shown, a stirring blade 2 is fixedly provided on the stirring shaft 1, and a horizontally placed baffle plate and a vertically placed radial blade are fixedly provided on the stirring shaft 1 above the stirring blade 2, which are used for the smooth rise and radial shearing of the liquid in the annular gap centrifugal extractor, and a second stirring blade 22 on the stirring blade 2 is located directly above the first stirring blade 21, and the second stirring blade 22 is tilted counterclockwise, and the first stirring blade 21 is tilted clockwise, that is, the tilt angles are opposite;

[0022] like Figure 2 , Figure 3 and Figure 4 As shown, a plurality of grooves 4 are provided on the end surfaces of the first stirring blade 21 and the second stirring blade 22 and penetrate through the upper and lower end surfaces thereof, and shearing teeth 3 are provided on the inner end surfaces of the grooves 4, and the shearing teeth 3 are conical grooves arranged in the grooves 4.

[0023] Before use, the device is fixed in a centrifugal extractor (mainly annular gap centrifugal extractor) and connected to a transmission motor. When the transmission motor drives the stirring shaft 1 to rotate in the centrifugal extractor, the stirring blades 2, baffles and radial blades on the stirring shaft 1 all rotate along the horizontal plane;

[0024] The stirring blade 2 will stir the liquid in the centrifugal extractor during the rotation process. Since the stirring blade 2 is provided with a groove 4, and the inner end surface of the groove 4 is provided with a shearing tooth 3 in the shape of a conical groove, the shearing tooth 3 will cut the liquid into multiple streams while stirring the liquid, and then the liquids will be stirred and mixed by the stirring blade 2 at the same time.

[0025] Since the first stirring blade 21 and the second stirring blade 22 have opposite inclination angles, when the stirring shaft 1 rotates clockwise, the first stirring blade 21 turns up the liquid, and the first stirring blade 22 turns down the liquid, so that the liquid can be mixed multiple times, so that the liquid can be fully mixed, and the mixing and mass transfer efficiency of the centrifugal extractor is improved;

[0026] As the mixed liquid enters the centrifugal extractor, the liquid level will slowly rise above the radial blades. At this time, the light and heavy phases of liquid will be discharged from different outlets due to the different centrifugal forces, thus achieving the purpose of centrifugal separation.

[0027] The above description is only an explanation of the preferred embodiments of the present application and the technical principles and other schemes used. At the same time, the scope of the invention involved in the present application is not limited to the technical scheme formed by a specific combination of the above technical features, but also should cover other technical schemes formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical scheme.

Claims

1. A high shear force stirring impeller for a centrifugal extractor, comprising a stirring shaft (1) and a stirring blade (2) fixed on the stirring shaft (1), characterized in that: The stirring blade (2) comprises a first stirring blade (21) and a second stirring blade (22), and the end surfaces of the first stirring blade (21) and the second stirring blade (22) are both provided with evenly distributed shearing teeth (3), and the shearing teeth (3) shear the liquid flowing through the end surface of the stirring blade (2) as the stirring blade (2) rotates.

2. The high shear force impeller for a centrifugal extractor according to claim 1, characterized in that: The second stirring blade (22) is located directly above the first stirring blade (21), and the first stirring blade (21) and the second stirring blade (22) are inclined in opposite directions.

3. The high shear force impeller for a centrifugal extractor according to claim 1, characterized in that: A plurality of grooves (4) are provided on the blades of the first stirring blade (21) and the blades of the second stirring blade (22), and the shearing teeth (3) are evenly arranged on the inner end surfaces of the grooves (4).

4. The high shear force impeller for a centrifugal extractor according to claim 3, characterized in that: The groove (4) is a rectangular parallelepiped groove.

5. The high shear force impeller for a centrifugal extractor according to claim 3, characterized in that: The groove (4) runs through the blade end surfaces of the first stirring blade (21) and the second stirring blade (22).

6. The high shear force impeller for a centrifugal extractor according to claim 1, characterized in that: The stirring blade (2) is located at the lower end of the stirring shaft (1).

7. The high shear force impeller for a centrifugal extractor according to claim 1, characterized in that: The stirring shaft (1) above the stirring blade (2) is also provided with a baffle and radial blades.

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