RU2305608C1 - Hydrodynamic generator of acoustic vibration - Google Patents

Abstract

FIELD: acoustics.

SUBSTANCE: generator comprises source of vibration made of a plate secured to the stands connected with the unmovable base and excited by cavitation caused by the fluid outflowing from the nozzle. The nozzle is made of a diaphragm.

EFFECT: enhanced efficiency.

1 cl, 2 dwg

Description

The invention relates to acoustic technology and can be used to intensify the processes of cleaning, emulsification, homogenization, disintegration of cellular substrates and extraction in the chemical, food, microbiological industries, as well as in the production of building materials for road surfaces.

Hydrodynamic devices are known in which the source of acoustic vibrations is a thin-walled plate or disk [1, 2], excited by a high-speed jet of liquid formed by a nozzle. These devices have complex structural fastening of the oscillating parts of the disk or plate, reducing the amplitude and limiting the spectrum and types of their own resonant vibrations. In addition, there are significant energy losses by the fluid flow, dissipating in the form of heat during friction of the flow against the nozzle walls. These reasons, in addition to reducing the efficiency of energy conversion, reduce the life of the device.

Also known are devices for generating acoustic vibrations directly in a liquid stream due to the interaction of vortex flows formed by special channels or resonant chambers and equipped in some cases with injection holes [3, 4, 5, 6, 7].

These devices have a high efficiency of mixing liquids and, if necessary, provide a narrow frequency response of the conversion. However, they do not eliminate the previously mentioned disadvantages, in addition, they require more careful regulation of the fluid pressure during adjustment.

The closest in technical essence solution is a hydrodynamic generator for processing suspensions [8], which includes a housing with a jet-forming nozzle and a reflector coaxially attached to the housing located normally to the liquid flow. The reflector is equipped with resonating elements in the form of plates or rods mounted in a housing around the reflector in a circle whose axis coincides with the axis of the jet forming nozzle and reflector. The surface of the reflector on the jet side is in the form of a hole for focusing the reflected flow to the center of the incident. The frequency of natural vibrations of the resonating elements is tuned to the frequency of natural vibrations of the processed liquid medium in the cavitation region. Resonant elements are fixed cantilever on both sides.

The main disadvantage of this device, in addition to the presence of energy losses due to friction in the jet forming nozzle and the relative complexity of the design, is the absence of a direct effect of the liquid jet on the resonating elements. To excite the resonating elements, a navigation region is preliminarily created due to the motionless fixed reflector focusing the reflected flow to the incident center, which leads to additional hydraulic losses in the form of heat.

The aim of the invention is to increase the efficiency of a hydrodynamic generator of acoustic vibrations and simplify (reduce the cost) of the design of the device.

This goal is achieved by the fact that in the proposed device containing a jet forming nozzle, a reflector and resonating elements, the jet forming nozzle is made in the form of a diaphragm with a hole, and the reflector is at the same time a resonating element made in the form of a plate mounted on racks to a fixed base. In the known technical solutions, the combination of features indicated above as new is not found. Therefore, the claimed solution has significant differences.

The invention is illustrated by drawings: figure 1 shows the appearance of two embodiments of a generator of acoustic vibrations, figure 2 presents its diagram.

A reflector 6 is attached to the fixed base 1 on the uprights 5. Connection of the unit parts can be performed using electric arc welding. The inlet pipe 2 with the adjusting nut 3 screwed on the threaded end is screwed into the fixed base 1 so that the jet forming nozzle 4 can be screwed onto its end 4. The gap h between the nozzle 4 and the reflector 6 is set equal to the hole diameter d, after which the assembly is fixed with the adjusting lock nut 3.

The hydrodynamic generator of acoustic vibrations is mounted in a technological tank below the liquid level with fastening to the pipe 2 by any of the known methods.

The device operates as follows. The working fluid, such as a washing solution, is pumped through the nozzle 2 into the jet forming nozzle 4, where the flow rate increases stepwise due to the smaller diameter of the hole d in the nozzle diaphragm. At the exit from the hole, a pulsating cavitational region is formed, which interacts with the reflector 6. The reflector is excited mainly on the longitudinal-bending type of oscillations and is their source, and the maximum excitation efficiency is achieved when the distance from the nozzle to the reflector h is equal to the inner diameter of the outlet of the diaphragm d.

Literature

1. SU 281925 C1, 03.03.1969.

2. RU 2205073 C1, 01/08/2002.

3. RU 2269386 C1, 05.05.2004.

4. RU 2156171 C2, 06/28/1995.

5. RU 2144440 C1, 08.24.1998.

6. RU 2161078 C1, 08/02/1999.

7. RU2248251 C1, 04/13/2004.

8. RU 2169625 C1, 10.01.2000.

Claims (2)

1. A hydrodynamic generator of acoustic vibrations, including resonating elements, a jet forming nozzle and a reflector coaxially attached to the fluid flow, characterized in that, in order to increase the efficiency of the device by reducing unproductive energy losses, as well as cheapening the design, the jet forming nozzle is made in the form diaphragms, and the reflector is simultaneously a resonating element and is made in the form of a plate mounted on racks to a fixed base. 2. The generator according to claim 1, characterized in that the reflector is excited mainly on the longitudinal-bending type of vibration and is their source, while the distance from the nozzle to the reflector h is equal to the inner diameter of the aperture d.

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