SU1204266A1 - Filtering centrifuge - Google Patents

Description

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The invention relates to the technique of separation of liquid inhomogeneous systems, in particular to filtering centrifuges and can be used in coal mining and other industries.

The aim of the invention is to reduce the moisture content of the sediment.

1 shows a centrifuge, a vertical section; 2 shows a centrifuge with a device for distributing the incoming slurry.

The centrifuge contains a filter rotor 1, which through the upper 2 and lower 3 RANGE of shock absorbers, pulley 4 and bearings 5 is connected to the housing of the catfish 6.

To the housing 6 coaxially the rotor 1 is rigidly attached to the loading tube 7 and the engine 8.

A device 9 for distributing the incoming suspension is attached to the bottom 6 of the rotor 1 relative to the longitudinal axis of the rotor. A filtrate collector 11 is also attached to the housing 6, which rests on the vibration insulators 10.

The centrifuge works as follows.

The rotor 1 is driven through pulley 4 and dampers 2 and 3 by a torque from the engine 8. The elastic rotor suspension, consisting of said shock absorbers 2 and 3, allows it to cause an imbalance to deviate from the initial axis of rotation by an angle cf (Fig .2), i.e. make precessional oscillations. Vibration insulators 10 reduce the dynamic loads transmitted to the foundation.

The suspension through the loading tube 7 is fed to the device 9 for distributing the incoming slurry and distributed through the rotor 1. Since the axis of the said device is offset relative to the rotor axis and the axis of the loading tube, the suspension, due to the pressure of the incoming portions, informs the rotor the moment of quantity and movement. the fact that the elastic suspension of the system is tuned to near-resonance mode, the rotor, in addition to rotation, makes precessional oscillations. The material, hitting the filtering surface of the rotor, is subjected to separation into liquid and solid phases. The liquid: is drawn into the filtrate collection 11, and solid into the casing 6. Effective042661

phase separation in a decisive degree depends on the intensity of precessional perturbations, since in this case violation

5 sediment structures in the rotor. The design of the centrifuge takes into account the average statistical data on the operation of industrial centrifuges using the example of dewatering fine-grained materials. Exodus

To this, a set of features of the invention is formed.

15 simultaneous fulfillment of the following conditions:

The disturbing moment must be between 4.5 and 45 Nm. The condition is fulfilled if the constructive condition is fulfilled.

G: R 0.03 - 0.1, where G is the amount of displacement, m;

R - maximum inner rotor radius 25, m

In order to fulfill this condition, a full resonance adjustment of the rotor precessional oscillations is necessary.

С0в (0.7 - 0.8) cOpejj

2Q where w is the frequency of forced oscillations, cr; , CJpga is the natural frequency of oscillations of the rotor in the direction

Wed, c.

35

40

Near-resonance adjustment is possible if the total stiffness of the shock absorbers is taken from a ratio of 0 (0.006 - 0.01) X L: 1 |, - s. All the characteristics given in the formula reflect the properties of the structure. Sc is the rigidity of the shock absorbers in the direction of deviation of the rotor axis, N m;

Dt | - The moment of inertia of the rotor relative to the longitudinal axis, N M C. For example, for a cone of mass M, with maximum R and minimum g radii, the moment of inertia is expressed by the formula 50

M

R t g 2

Md is the natural frequency of oscillations of shock absorbers, p. Amplitude-frequency analysis; characteristics of the centrifuge shows that the rotor deflection angle increases with increasing

I

g- Inside the area of stable

L

 bani are operating frequencies co

rotation of the rotor. Formula for defined. The division of stiffness Ccf in full volume takes into account this circumstance by introducing a numerical coefficient in the range of 0.006-0.01.

Fairness and versatility

This formula was confirmed on a test shaker. The results of more than a hundred experiments were subjected to static processing. It is established that the angle of deviation of the rotor is -AA within 1-3.

Thus, the above ratios allow one to realize an optimal operation mode of the centrifuge, which contributes to an increase in the efficiency of separation of the liquid and solid phases of the suspension. . . This makes it possible to reduce

humidity by 0.2%, which is equivalent to the economic effect on one centrifuge about 50 thousand rubles.

Cyc / rfM3UJ9

fi & 1

VNIIPII Order 8457/7

Tvdazh 542 D - Subscription

Branch PPP Patent, Uzhgorod Project 4, 4:

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Claims (1)

A FILTERING CENTRIFUGE * containing a housing, a cone-shaped rotor, shock absorbers located between the housing and the rotor, a loading pipe mounted coaxially with the rotor on the housing and a device for distributing the incoming suspension, characterized in that, in order to reduce the moisture content of the sediment, a distribution device the incoming suspension is located eccentrically relative to the longitudinal axis of the rotor, and the eccentricity is E = (0.03 - 0.1) R, where E is the value of the eccentricity 7 m, m; R is the maximum internal radius of the rotor, m; the total stiffness of the shock absorbers in the direction of the deviation of the longitudinal axis of the rotor is determined from the relation with _h = (0.006 - 0.01) s _h - ω ', where Cs is the total stiffness of the shock absorbers in the direction of the deviation of the rotor axis, N'm; is the moment of inertia of the rotor relative to its longitudinal axis, Nm-s ^g ; _ ω _α is the natural vibration frequency of the shock absorbers, s ~ *. ; and 1204266 1 1204266 ²