Sedimentation type centrifugal separator possessing double stage of drum and double stage of unloading spiral

Abstract

A decanter centrifuge with two-stage drum and two-stage screw discharge, mainly composed of a motor, a feeding device, a two-stage material accelerator, a two-stage drum, a two-stage screw conveyor and a differential, the material The two-stage drum is accelerated to rotate, and the solid and liquid phases are separated. Under the action of the differential, the two-stage screw conveyor pushes the separated solid phase out at a speed slightly higher or slightly lower than that of the drum, and the liquid phase It overflows from the overflow hole at the big end of the primary and secondary drums. After the materials are separated by two-stage centrifugal sedimentation, the liquid content of the solid phase after separation can be reduced, the application field is expanded, and it has great practical value and social and economic benefits.

Description

(1) Technical field [0001] The patent of the invention belongs to the spiral discharge sedimentation centrifuge, especially a two-stage spiral discharge centrifugal sedimentation separation structure and a material accelerator device, which are suitable for the solid-liquid mixture that needs to be centrifugally separated and the dryness of the solid phase after separation is required. higher occasions. (2) Background technology [0002] Before the patent of the present invention was made, the prior art screw discharge sedimentation centrifuge mainly consisted of a motor 1, a feeding device 2, a main bearing 3, a screw bearing 4, a primary drum 6, a primary screw conveyor 7, a differential Speed ​​gear 11 and automatic control device 12 are formed. Its working principle is: the motor 1 drives the primary drum 6 and the secondary drum 9 to rotate at high speed through the transmission belt, and under the action of the differential 11 and the automatic control device 12, the ...

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Problems solved by technology

The disadvantages are: 1. Due to the limitation of the structure, the solid phase after preliminary separation has a short residence time in the conical section drum, and the solid phase cannot be effectively dehydrated, so that the moisture content of the separated solid phase is high, which is difficult for materials that are difficult to separate. , it is difficult to meet the requirements of the production process; 2. In the traditional one-stage centrifugal sedimentation centrifuge, the dehydration of the solid phase is mainly carried out in the cone section of the one-stage drum. Since the diameter of the cone section drum is gradually reduced, that is, the solid phase is dehydrated. The centrifugal force on the phase material also gradually decreases, which is also a main reason why the solid phase cannot be effectively dehydrated; 3. If two traditional one-stage centrifugal sedimentation centrifuges are used in series, due to The solid phase can no longer flow, and the solid phase cannot be input into the second centrifuge to continue dehydration; 4. The traditional one-stage centrifugal sedimentation centrifuge does not have a material centrifugal accelerator, and the material to be separated is from the outlet of the screw conveyor cylinder to the next centrifuge. The distance between the inner surface of the liquid layer on the drum wall is relatively large, that is, the centrifugal force difference on the material is large, and it is easy to disturb the centrifugal sedimentation liquid pool, which has a great impact on the separation process, resulting in a relatively high solid content in the separation liquid.

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