A jet classification and purification method for ultrafine powder and its special device

Abstract

A high efficiency ultrafine powder jet flow grading purification method and a special-purpose device thereof can mainly solve the existing problems that a conventional dirty ultrafine powder jet flow grading apparatus is hard in purification, low in particle grading efficiency, low in precision, and hard to control grading granularity; the main technical points are that the special-purpose device comprises a compressed air inlet (1), a feeding funnel (2), a Laval nozzle (4), a feeding pipe (3) connected with a grading box (5), a box cover (19) arranged above the grading box, a grading box bottom (13) arranged below the grading box, two Condar blocks arranged below a feeding pipe port and symmetrically arranged in the grading box, four side plates (11), four grading adjusting blades (9) placed on the side plates, and locking screws (18); the locked two Condar blocks (6) and the four side plates (11) are arranged on two sides of the grading box so as to form symmetrically arranged 6 powder outlets and an auxiliary apparatus; the high efficiency ultrafine powder jet flow grading purification method and the special-purpose device are mainly applied to high efficiency ultrafine powder grading purification.

Description

technical field [0001] The invention relates to the field of powder jet purification and grading, in particular to a superfine powder jet grading and purification method and a special device thereof. Background technique [0002] With the wide application of ultra-fine powder in modern industry, the position of powder classification technology in powder processing is becoming more and more important. In powder classification technology, jet classification is favored for its simple structure, good sealing, no internal heat source, and no rotating parts. The current development of ultra-fine powder jet classifiers mainly focuses on the streamlined design of the Kangda block. The control of the classification particle size is only through the adjustment of the classification adjustment blade. There are problems such as difficult control of the classification particle size, low classification efficiency, and low classification accuracy. question. Contents of the invention ...

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Problems solved by technology

[0003] In view of the above-mentioned problems, the present invention mainly utilizes the Coanda effect, the Bernoulli effect and the jet entrainment effect. Under the action of gravity and inertia, each powder particle can change the speed of each air flow channel by adjusting the speed regulating valve on each air flow channel pipe. The pressure in the air flow channel makes particles of different densities, sizes and particle sizes classified, and enters different types of powder outlet pipes, thereby solving the problems of difficult jet purification and classification of impurity-containing ultrafine powders, and difficulty in controlling the particle size of the classification; By opening six symmetrically arranged powder outlets of three different types on the classification box and three powder outlets at the bottom of the classification box, the problems of low classification efficiency and low precision of the existing jet powder classification device are solved

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