CN2684934Y

CN2684934Y - Hydraulic swirler with filtering net

Info

Publication number: CN2684934Y
Application number: CN 200420032531
Authority: CN
Inventors: 任连城; 梁政; 杨志
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2004-01-13
Filing date: 2004-01-13
Publication date: 2005-03-16
Anticipated expiration: 2014-01-13

Abstract

The utility model relates to a hydrocyclone used for solid-liquid separation, grading and compression, etc, in particular to a hydraulic swirler with filtering net which is mainly composed of a cyclone body, a liquid inlet pipe and an over flow pipe, etc. The hydraulic swirler with filtering net is characterized in that a filtering net is provided between the inner wall of the liquid inlet pipe and the inner wall of the overflow pipe, with the diameter and the form of the filtering net in concord with that of an axial zero speed enveloping surface. The upper part of the filtering net is connected with the upper wall of the cyclone, and the lower part is an open, which can guarantee the inner swirling flow to return out propitiously. The cyclone fundamentally resolves the effect of short circuit flow, circulating flow, and the particles diffusion motion to the separating efficiency of the cyclone, and therefore the separating efficiency of the hydrocyclone is improved ultimately.

Description

Band screen pack formula hydrocyclone

Technical field

This is novel to relate to the hydrocyclone that is used for Separation of Solid and Liquid, classification, concentrates etc.

Technical background

Hydrocyclone is the separation very widely of a kind of purposes, classification, screening installation.Its operation principle is: high-pressure fluid tangentially enters cyclone, pressure energy is converted into kinetic energy, fluid produces high speed rotary motion in cyclone, and after fluid moves downward the hydrocyclone cone, because radius of turn reduces gradually, makes that swirl velocity and consequent centrifugal force are more and more higher.Under action of centrifugal force, the particle of different-diameter radially is regularity distribution along cyclone, wherein the major diameter distribution of particles is at the outward flange of cyclone, in the middle of the fine grained of minor diameter then is distributed in, relend the structure that helps cyclone itself special, the fluid that cleans after separating is discharged from hydrocyclone top overfall, and solid phase is then discharged from the hydrocyclone bottom, thus the realization Separation of Solid and Liquid.

Hydrocyclone has obtained in a plurality of fields using widely at present, and the motion of hydrocyclone inner fluid can reduce following several citation form:

(1) interior eddy flow and outer eddy flow

High-pressure fluid tangentially enters cyclone and produces rotatablely moving of high speed, what wherein rotate in peripheral long radius scope is the outer eddy flow that carries most crude particle, finally enter underflow, fine grained then rotates eddy flow in the formation with most fluid in the minor radius scope, finally discharge through overfall.Interior eddy flow and outside near the turning point of eddy flow, variation has taken place from bottom to top in the fluid axially-movable, be zero promptly in turning point place fluid axial velocity, all these points have constituted a taper seat from bottom to top, generally be called axial zero-speed enveloping surface, it is a key character of hydrocyclone, also is parting surface.In general, axially the fluid beyond the zero-speed enveloping surface forms underflow, with interior formation overflow.

(2) short-circuit flow

High-pressure fluid enters cyclone, and some fluid is walked around the overflow pipe outer wall along the cyclone roof and entered overflow pipe, and this part fluid through separating direct formation overflow, is not commonly referred to as short-circuit flow.The existence of this partial short circuit stream has reduced the separating effect of hydrocyclone widely.

(3) circular flow

Region memory between near the overflow pipe junction of cyclone cylinder and cone and eddy flow wall is called circular flow a circulation eddy region.The existence of this circular flow has occupied inner quite a few the separated space of cyclone, has reduced efficiency of hydrocyclone and disposal ability.

In addition, the diffusion motion of particle has also reduced efficiency of hydrocyclone, in the flow field of rotation at a high speed, because the existence of turbulent motion, the motion of particle presents tangible randomness, there is quite a few particle to pass axial zero-speed enveloping surface and flows to into interior eddy flow, discharge, finally have influence on the separating effect of cyclone through overfall by outward turning.

Summary of the invention

The purpose of this utility model is to provide band screen pack formula hydrocyclone, and this cyclone can fundamentally solve the influence of the diffusion motion of short-circuit flow, circular flow and particle to the cyclone separative efficiency, thereby finally improves the separative efficiency of hydrocyclone.

For reaching above purpose, the utility model by the following technical solutions.

Band screen pack formula hydrocyclone, mainly form by cyclone body, feed tube, overflow pipe etc., it is characterized in that a screen pack is arranged between the inwall of feed tube and overflow pipe, the diameter of described screen pack is consistent with the axial zero-speed enveloping surface of cyclone with shape.

Screen pack in the utility model, its top is connected with the roof of cyclone, and its underpart is uncovered, with returning out smoothly of eddy flow in guaranteeing.

After increasing axial zero-speed enveloping surface screen pack in the hydrocyclone, significant change does not take place in its intrinsic fluidised form, but the diffusion motion of its short-circuit flow, particle eliminates substantially, and its circular flow has obtained good restraining, and its separating effect obviously improves.

Compared with prior art, the utlity model has following beneficial effect:

(1) elimination or reduction short-circuit flow are to the influence of separative efficiency.Setting up axial zero-speed enveloping surface screen pack mainly is that short-circuit flow is directly filtered, and the major diameter particle that carries in the short-circuit flow is blocked in outside the overflow, fundamentally solves the short-circuit flow problem;

(2) suppress circular flow.Screen pack is divided into two the circular flow zone in the cyclone flow field, when circular flow occurs, finishes a circulation and wants the vertical screen pack that passes through twice, reduces the intensity of circular flow to a great extent.In addition, the fluid in the circular flow all is not separated initial liquid basically, carries a large amount of big particle diameter solid phase particles, sets up axial zero-speed enveloping surface screen pack and can stop the big particle diameter solid phase of carrying in the circular flow to enter interior eddy flow well;

(3) eliminate of the influence of the diffusion motion of particle to the cyclone separative efficiency.On axial zero-speed enveloping surface, be provided with screen pack can filter out well those be diffused into from outer eddy flow because of random motion in the particle of eddy flow, eliminate of the interference of outer eddy flow to underflow, thus the separating effect of raising cyclone.

Description of drawings

Fig. 1 is a fluidised form distribution map in the conventional hydrocyclone

Fig. 2 is the structural representation of the utility model band screen pack formula hydrocyclone

The specific embodiment

Referring to Fig. 1; conventional hydrocyclone; mainly form by cyclone body 1, feed tube 2, overflow pipe 3 etc.; high-pressure fluid tangentially enters cyclone through feed tube 2 and produces high speed rotary motion; in peripheral long radius scope, rotate be carry most crude particle or longitudinally outside eddy flow 4; finally enter underflow, fine grained then rotates eddy flow 5 in the formation with most fluid in the minor radius scope, finally discharges through overflow pipe 3.Interior eddy flow and outside near the turning point of eddy flow, an axial zero-speed enveloping surface 6 is arranged.Walk around the short-circuit flow 7 that the overflow pipe outer wall enters overflow pipe along the cyclone roof, reduced the separating effect of hydrocyclone widely.Efficiency of hydrocyclone and disposal ability have also been reduced near the region memory between overflow pipe and eddy flow wall cyclone cylinder and the cone junction at circular flow 8.

Referring to Fig. 2, the utility model band screen pack formula hydrocyclone, mainly form by cyclone body 1, feed tube 2, overflow pipe 3 etc., it is characterized in that, one screen pack 9 is arranged between the inwall of feed tube and overflow pipe, and the diameter of described screen pack is consistent with the axial zero-speed enveloping surface 6 of cyclone with shape.Described screen pack, its top is connected with the roof of cyclone, and its underpart is uncovered, with returning out smoothly of eddy flow in guaranteeing.

Claims

1. be with screen pack formula hydrocyclone, mainly form by cyclone body (1), feed tube (2), overflow pipe (3) etc., it is characterized in that, one screen pack (9) is arranged between the inwall of feed tube and overflow pipe, and the diameter of described screen pack is consistent with the axial zero-speed enveloping surface (6) of cyclone with shape.

2. cyclone as claimed in claim 1 is characterized in that, the top of described screen pack (9) is connected with the roof of cyclone, and its underpart is uncovered.