SU642004A1 - Method of balancing separator drum at starting and stopping - Google Patents

Description

The invention relates to a technique for separating polydisperse liquid systems, in particular, to methods for balancing the rotors of liquid separators, and can be used to control the vibration of the separator drums when passing through a critical rotational speed.

The closest technical solution to the proposed is a method in which the transition through a critical rotational speed is facilitated by filling the drum with water at the start and stop times of the separator {11 This method reduces the rate at which vibroresonance occurs, and the presence of critical speeds is not eliminated.

The aim of the invention is to reduce vibroresonance and increase the reliability of the separator.

For this, in the proposed method, the critical speed of rotation of the drum and its onset time and the supply of water to the drum are predetermined immediately before the onset of the critical speed under the condition t below. water -f L t zatr. water t cr. soon ..

where t is under. water - the time of water supply from the beginning of the start-up stop bar.ban; At loading water - time of filling the drum with water;

t cr. soon - time of onset of the critical speed.

The method is carried out as follows.

The preliminary critical speed of rotation of the drum and its time are determined.

offensive.

Then, when the separator Barbara is started or stopped, water is supplied to the latter through the same supply pipe that serves to supply the separated liquid. The water supply to the drum is controlled immediately before the onset of the critical speed under the condition t under. water -f L t zagr. water tKp. fast where t under water - water supply time QT start start (stop the drum); 1 boot water - time of filling the drum with water; t cr. soon - time of onset of the critical speed. The amount of water supplied is determined by the volume of the drum.

The method is based on the relationship of the critical rotational speed with its mass, mathematically described by the equation

. ()

where m is the critical speed of rotation of the drum;

K, C-, respectively, design parameter and rigidity; m is the mass of the drum. From incidence (1), it follows that the larger the drum mass, the smaller its critical speed. Consequently, an increase in the drum mass at the moment the critical speed starts (for example, by pouring liquid into it) reduces the magnitude of the latter, and it is already passed, i.e., the vibroreson area instantly passes when the separator is started and stopped.

After some time, the added liquid is ejected from the drum by centrifugal forces, as is the case in the transfer and separation of polydisperse liquids. When the drum reaches its working size (xx), a centrifuged product, such as milk, is fed into it.

Example. The separator drum COMZ-SHO has a critical rotational speed of 129 rad / s. The time from the start of the start of the separator to the onset of the vibroresis of ance tscr. 35 s Drum filling time of 2 s. After turning on the separator through time t below. water 33 s supply water to the drum in the amount of l. Acceleration is performed with a constant acceleration of 3.6 rad / s, and the water-filled coctoHHne of the drum lasts 4 seconds (drum capacity 0.5 l). During this time, in accordance with this acceleration, the drum acquires a speed of 136 rad / s. Thus, with an increased mass of the drum with a liquid according to the formula O), the critical velocity (129 rad / s) is already

traversed. During the stop of the separator drum, the operations are repeated in sequence. At the same time, due to the morning of the drum when filled with liquid, the value of the critical speed is first reduced, and then after ejection of the liquid by centrifugal forces, it is already traversed according to formula (1).

Using the proposed method

control of vibroresonance at start-up and. stopping the separators increases their service life and reliability by reducing fatigue stresses in the bearing supports, while increasing the service life of the throat bearing support

S at 150/0.

Claims (1)

1. Instructions of the phyme Аfa-Laval for servicing an industrial separator of the type GEICH 412 V-31, 1970.