CN2155957Y

CN2155957Y - Gas dynamic sealing device of powder classifier

Info

Publication number: CN2155957Y
Application number: CN 93209062
Authority: CN
Inventors: 陈文华; 杨介更; 杜文博; 叶松林; 倪光裕
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 1993-04-07
Filing date: 1993-04-07
Publication date: 1994-02-16
Anticipated expiration: 2003-04-07

Abstract

A gas dynamic sealing device for a powder classifier, including a labyrinth sealing device between the upper end surface of the rotor and the upper cover of the cylinder. It is equipped with two or more throttle valves matched with the throttle holes for joint pressure regulation, and at the same time, axial ribs and radial ribs are added to the rotor to reduce or prevent larger particles from entering the rotor. The inner cavity can improve the sealing effect, which can immediately improve the classification effect of the powder classifier. This device can be used in the pneumatic classification device of ultrafine powder.

Description

Air power sealing device for powder sorting machine

The utility model relates to the device of solid being separated with air-flow from solid.

In the background technique field, powder separator commonly used be rotor 5 ' rotating shaft 1 ' drive under make high speed rotating, as shown in Figure 1, because rotor 5 ' macroscopic deformation and the restriction of working environment, rotor 5 ' and loam cake 3 ' between must leave bigger gap a, during work, rotor 5 ' rotation, while suction pipe 2 ' outwards bleed, make rotor 5 ' inner chamber A cause negative pressure, gas-solid mixture from supply pipe 6 ' be inhaled into cylinder 4 ' in, after rotor separates, the granularity smaller particles is with the gap of air-flow between rotor blade, from suction pipe 2 ' taken away, and the bigger particle of granularity is under action of centrifugal force, after the barrel collision, be deposited on cylinder 4 ' the bottom, thereby reach the purpose of separation.But, because the size of gap a is bigger, the bigger particle of a part of granularity can through gap a enter rotor 5 ' inner chamber A in, reduced the effect of classification.

The purpose of this utility model is between rotating shaft and loam cake seal arrangement to be set, thereby minimizing even the bigger particle of prevention granularity enter the inner chamber of rotor, improve the effect of classification.

The technical solution of the utility model is: between the upper-end surface and cylinder loam cake of rotor, the labyrinth gland of being made up of sealing loam cake and sealing lower cover is housed, in sealing, cover the flow controller of the throttling pore that some five equilibriums are housed out, other is equipped with the throttle valve more than two that matches with throttling pore, air on throttle orifice O mouth on the throttle valve and flow controller all throttling pore O ' mouthful, the circular groove of flow controller lower end surface, the waist shaped hole P mouth of sealing loam cake, after entering labyrinth gland, one the tunnel in the Q mouth flows into rotor internal cavity A, another road flows into cylinder interior B through the R mouth, for the bigger particle of granularity can not be entered in the A from B through gap b, should make the air pressure of the throttling air that enters the P place be slightly larger than the air pressure at B place.

This device is compared with background technique, the useful effect that has is: owing to set up labyrinth gland between rotor upper-end surface and cylinder loam cake, regulate air inflow with throttle valve and throttling pore, and can on rotor, set up stiffening rib, both combine, can reduce or stop the bigger particle of granularity to enter rotor internal cavity, improve sealing effect, also promptly improve the grading effect of powder separator.This device can be used on the pneumatic separator for superfine powder device.

Below in conjunction with drawings and Examples, this device is described in detail.

Powder separator structure principle chart in Fig. 1, the background technique;

The structure principle chart of Fig. 2, this seal arrangement;

Fig. 3, sealing loam cake worm's eye view;

Fig. 4, flow controller worm's eye view;

Fig. 5, rotor structure schematic representation;

Fig. 6, rotor structure plan view.

As shown in Figure 2, on suction pipe 2 external cylindrical surfaces between the cylinder loam cake 3 of the upper-end surface of rotor 5 and powder separator, be with the labyrinth gland of forming by sealing loam cake 8 and sealing lower cover 9, sealing loam cake 8 is fixedlyed connected with suction pipe 2 external cylindrical surfaces, sealing loam cake 8 is connected with cylinder loam cake 3, flow controller 7 by screw respectively, and sealing lower cover 9 is fixedlyed connected with rotor 5 upper ends.As shown in Figure 3, on a circumference of sealing loam cake 8, have one group of waist through hole 12.As shown in Figure 4, have one group of throttling pore on the circumference of flow controller 7 upper-end surfaces by several five equilibriums, the lower end surface has the circular groove 13 that is communicated with throttling pore, and the throttle valve 10 more than two is housed on the flow controller 7 in addition, and the filter 11 of corresponding number is housed on the throttle valve 10.

Throttle orifice O mouth and the air of air on throttle valve 10 directly enters from all the other throttling pore O ' mouths, through the circular groove 13 of flow controller 7 lower end surfaces, the waist through hole 12P mouth of sealing loam cake 8, after entering labyrinth gland, one the tunnel in the Q mouth flows into rotor 5 inner chamber A, and another road flows into cylinder 4 inner B through the R mouth.In order to reduce the air total amount that enters in A, the B as far as possible, to prevent that B place air pressure from raising, and make the gas-solid mixture can not be in supply pipe 6 is inhaled into cylinder 4, this device adopts the throttling pore and the throttle valve 11 associating pressure regulation of flow controller, makes the air pressure of the laggard P of the going into mouth of throttling be slightly larger than the air pressure at B place.Because the air pressure at B place is than the air pressure height (two places are negative pressure) at A place, this device is opened throttling pore on a close circumference at B place.Concrete way is to open the waist through hole 12 of radius 〉=2.5mm on sealing loam cake 8, a circular groove 13 is left in flow controller 7 bottoms, throttling pore is opened on its top, diameter and number are determined on a case-by-case basis, during in addition owing to rotor 5 rotation speed change, the pressure reduction at B place and rotor internal cavity A place changes in the cylinder 4, and the pressure of rotor internal cavity A remains unchanged substantially, promptly the air pressure of the throttling air of Yin Ruing also needs to change thereupon, therefore throttle valve 10(model being installed on flow controller 7 again is KLJA-L10), filter 11 is installed on the valve.Adopting labyrinth seal structure, is in order to increase the resistance of air flows, further to reduce the air total amount of introducing, increasing work efficiency.

In order to reduce or to stop the bigger particle of granularity to enter the inner chamber of rotor 5, improve sealing effect, simultaneously take measures to strengthen the rigidity of rotor 5 again, thereby reduce the amount of deformation of rotor 5 in operation process, make the axial clearance b in labyrinth in operation process, remain unchanged, promptly compare greatly and reduce with the gap a of background technique.Concrete measure is: as Fig. 5, shown in Figure 6, between rotor 5 upper/lower terminals shaft orientation reinforcing rib J is set ₁With rotor 5 upper-end surfaces radially stiffening rib J is set ₂After stiffening rib is set, also increased the resistance that gas-solid mixture flows, in order to reduce resistance, the sectional shape of shaft orientation reinforcing rib is circular, radially the sectional shape of stiffening rib is streamlined or parallelogram, when rotating shaft 1 drive rotor 5 is pressed direction rotation as shown, can produce a pumping force that makes progress, both strengthen the rotor rigidity to reach, do not influence the purpose that gas-solid mixture flows again, above-mentioned two class stiffening ribs all evenly distribute on circumference, when less demanding, only need add a stiffening rib J ₁Or only need add radially stiffening rib J ₂

Claims

1, a kind of Pneumatic sealing device of powder separator, it is characterized in that: between the upper-end surface and cylinder loam cake [3] of rotor [5], the labyrinth gland of being made up of sealing loam cake [8] and sealing lower cover [9] is housed, the flow controller [7] of the throttling pore of several five equilibriums is housed out on sealing loam cake [8], other is equipped with the throttle valve more than two [10] that matches with throttling pore, throttle orifice (0) mouth and the flow controller [7] of air on throttle valve [10] gone up all throttling pore (0 ') mouths, the circular groove [13] of flow controller [7] lower end surface, sealing loam cake [8] waist shaped hole [12] is mouth (P), after entering labyrinth gland, one the tunnel in (Q) mouthful inflow rotor [5] inner chamber (A), another road mouthful flows into cylinder [4] inner (B) through (R), makes the air pressure of the throttling air that (P) locate be slightly larger than the air pressure that (B) locates.

2, seal arrangement according to claim 1 is characterized in that: throttle valve (10) is gone up and is connected filter (11).

3, seal arrangement according to claim 1 is characterized in that: between rotor (5) upper/lower terminal face shaft orientation reinforcing rib (J is set ₁) and in rotor (5) upper-end surface radially stiffening rib (J is set ₂).