SU1646614A1 - Method of excitation of ultrasonic vibrators - Google Patents

Abstract

The invention relates to the field of application of ultrasonic vibrations to intensify technological processes, in particular, can be used in cleaning and degreasing products. The purpose of the invention is to increase excitation efficiency. Vibrators are fed by an excitation signal from a high-frequency generator with a constant amplitude of output voltage. The amplitude of the exciting signal for each of the vibrators is set to the maximum in its decisive frequency band and its 1 ia ia limits. Besides. the sub-urging signal holds the vibrators ui peioHdiica for and .i notes of the time interval 1 n f-ly, 1 HI

Description

And the hatch refers to an ultrasonic technique that can be used to excite / f - .. i without a mosaic ultrasonic transform. residents

The goal (gain is to increase the efficiency of excitation.

The drawing shows the timing process

The excitation signal is applied to all vibrators at the oscillating frequency generator (HKCH) with a constant amplitude of the output voltage U-, corresponding to the operating voltage of the vibrators. During the operation of the GCP, the current consumed by each vibrator is measured by one of the known methods, for example, using a current transformer, the voltage U, which is proportional to the current in the primary winding, is obtained in the n, 1 secondary winding. When the primary measuring signal L / HIM exceeds the set threshold, the control signals tAnp of the excitation voltage of the vibrators are generated. The logical addition of all signals is performed, and the resulting signal is t / ynpi

is used to control the frequency deviation of the hopper.

In the initial state, the frequency of the GCF is set, for example, at the lower limit of the deviation, and the voltage applied to each of the vibrators is at the level. When scrap L is chosen from the condition

(Q "Ht-A / -IK,) f ,, Q",

where QM.H.L is maximal equivalent

the quality of the vibrator; f is the average resonant frequency of the vibrator set;

W. ,,., / ,, ke - / „is the difference between the maximum and minimum resonant frequencies of vibrators from a given set.

/, - resonant frequency of an individual

vibrator.

As the frequency of the GCh signal increases, after passing through the maximum of the resonant characteristic of the vibrator, which first entered the resonance, its measurement

oh oh

the signal is reduced to a value less (7yr, as a result of which the signal sLmr is turned off | and the voltage applied to the nibor is reduced to the voltage (Li,

Change the frequency of the signal with GKCH in the frequency range). corresponding to the scatter of the resonant frequencies of the vibrators, leads to a sequential switching in i6 of the waiting signal on all vibrago pax from bm to k (Umzh and back

(Y- is chosen so that the signals (1 overlap in time at the highest Q of vibrators, while the sum signal U remains on until the last vibrator with the highest resonant frequency leaves the resonance. When switched off, Lm | the frequency of the HKCH signal decreases and the whole the process is repeated, but from a vibrator with a maximum resonant frequency

When a technological load is applied to the vibrators, for example, when products are lowered into the cleaning bath, the load on the vibrators increases and the peso frequency of the vibrators changes. Since the degree of load effect on each vibrator is different, the cohebane parameters also change to equal degrees. L is switched on earlier and for a longer time, which leads to the expansion of the frequency range of the frequency response of the switchgear and its displacement following a change in the average decision frequency of the vibrators

Thus, the change in the parameters of the oscillation under the influence of technological load, which leads to a decrease in

five

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0

five

the instantaneous power P of each vibrator is compensated by increasing the time of simultaneous operation of several vibrators. As a result, the total power delivered to the process medium remains unchanged.

Frequency sweep can be carried out both in continuous mode and in the mode of step approximation of the deviation function

Since the amplitude of the mechanical oscillations of the vibrators when the frequency of the electric excitation signal is changed is not established instantaneously, but a transient process takes place, the efficiency of the use of the vibrators is additionally increased by holding the frequency of the exciting signal during the installation of mechanical oscillations near the resonator vibrator

Claims (1)

Invention Formula 1 A method of exciting ultrasonic vibrators pierced from a single source by; ultrasound oscillation frequency within the range of resonant frequencies of individual vibrators and controlling the amplitude of the excitation signal, which, in order to increase the efficiency of the excitation, amplitude of vibrations, Met about CHI Nala for each of the vibrators set the maximum in its resonant frequency band and the minimum for its prehelami 2 The method according to claim 1, characterized in that the frequency of the excitation signal is kept near the vibrator resonance for a predetermined time interval. {.on peg-c: gogiiesl o nogme