SU1202629A1 - Self-sustained vibration exciter - Google Patents

Description

The invention relates to the industry of building materials and other industries that use vibration technology, for example, to transport compaction materials for concrete mixes, etc.

The purpose of the invention is to increase the amplitude of oscillations.

FIG. 1 shows a self-oscillating vibration exciter, a longitudinal section; in FIG. 2 - rotor, cross section.

The self-oscillating vibration exciter comprises a base 1, an electric motor 2 mounted on it 3 and a shaft 3 on which a rotor 4 is fixed with welded to it bottoms 5, at least two containers 6 are made in the rotor 4, partially filled with liquid 7. The rotor 4 is enclosed by a casing 8 The base 1 is located on elastic supports 9.

The proposed vibration of the pathogen works as follows.

Liquid 7 is poured into each closed cylindrical container 6 of the rotor 4 so that, when the rotor 4 rotates, it forms an internal cylindrical surface that does not reach the walls of the other container 6 and does not fill the container 6 completely (axially) into which it is poured. When the rotor 4 rotates at a speed greater than critical, in a wide range of its revolutions, the entire system will oscillate with frequencies approximately equal to or a multiple of the natural oscillation frequency.

The critical speed, for example, for three tanks 6 is determined by the formula

,

ijm + in + m.j

m.

Where

S - critical angular velocity i

m.

, m, m

the stiffness of the elastic elements 9, the mass of the electric motor 2, the base 1 and all the structural parts installed on it,

the fictitious masses of the liquid corresponding to each tank, the cocks filling this tank to the axis of rotation, if this tank were in the rotor 4 alone.

Thus, the entire volume occupied by the liquid and unused by the liquid of each tank is considered as completely filled with liquid (up to the axis of rotation). due to the repeated use of the same empty space of the rotor when calculating the fictitious masses of LIQUID; You can get any arbitrarily low value of the critical speed, and hence the natural frequencies at high rotor speeds.

When the auto-oscillating vibration exciter is in operation, oscillations of the rotor occur at frequencies that are approximately equal and natural frequencies. Moreover, these oscillations will be superimposed by oscillations from the rotor's own unbalance and other oscillations caused by a fluid with higher frequencies at lower amplitudes ah. The magnitude of the oscillation amplitudes caused by the liquid depends mainly on its quantity and viscosity, diameter, length and angular velocity of rotation of the rotor.

The invention makes it possible to obtain a mechanical oscillatory system with large amplitudes of oscillations with minimum expenditure of energy consumed.

Editor N. Dankulich

Compiled by A.Sostin Tehred M. Parotsay

8349 / 7Tlrazh 451Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

FIG. 2

Proofreader A. Obruchar

Claims (1)

A self-oscillating vibration exciter containing a base, an electric motor mounted on it, a rotor with covers mounted on its shaft, which means that, in order to increase the oscillation amplitude, at least two containers are concentrically formed in the rotor and the latter are partially filled with liquid.