RU2178724C1 - Self-cleaning resonant filter-activator - Google Patents

Abstract

FIELD: devices for cleaning and mixing of liquid media by low-frequency waves. SUBSTANCE: self-cleaning resonant filter-activator has cylindrical casing with covers and branch pipes, two radiators, resonance chamber filled with liquid medium, flexible shell and vessel filled with compressed gas, and filter element located between flexible shell and casing, and tube plate. Filter element is located on tube plate, and they both separate resonance chamber into two parts; cavity receiving liquid media subject to mixing and purification, and cavity with purified medium. In this case, one radiator is located in one cavity, and the other radiator is located in the other cavity. Invention allows efficient mixing and purification of various media in large volumes. EFFECT: higher productivity of device and its prolonged service with continuous operation. 2 dwg

Description

 The invention relates to a device for cleaning and mixing liquid media with low-frequency waves, may find application in the treatment of wastewater and water extracted from groundwater, in the manufacture of juices, wines and spirits, in brewing, in the treatment of vegetable and synthetic oils, with stirring and purification of solutions of the oil and chemical industries and in other technological processes.

 It is known "Device for cleaning liquid" A. S. 2015108, MK C 02 F 1/00, 1/52 from 05/05/91. including a housing with a lid, a nozzle for supplying a cleaned liquid and a branch pipe for removing purified liquid, a sludge collection unit, an air supply unit and bunkers.

 The disadvantage of this device is the low efficiency and poor quality of the purified liquid.

 Also known is the "Vibratory Separator" A.S. 2018383, MK B 07 V 13/11 from 04/30/91. including housing, friction deck, feeder and distributor, vibration exciter and product receivers.

 The disadvantage of this vibration separator is that the ultrasonic exciter is effective for small volumes of liquid, and for large volumes the effectiveness of its impact is low.

The closest analogue of the claimed technical solution is the "Acoustic resonator" A. S. 1760540, MK G 10 K 11/00 from 09/07/92. , bull. 33, comprising a cylindrical body, a vibration exciter, a resonance chamber, an elastic shell, and a gas volume between the body and the elastic shell. [1]
The disadvantage of this acoustic resonator is that it is impossible for them to efficiently mix several media and even more so to clean and filter.

 The aim of the present invention is to expand the functionality and increase the intensification of technological processes.

 The stated goal is achieved by the fact that low-frequency hydroacoustic emitters of small wave sizes and low power excite the natural resonant frequency of the medium in the device, as a result of which low-frequency oscillations of high intensity are formed in the medium, the phases of compression and expansion of the wave act on the particles of the liquid medium, intensively mixing and pushing them through the pores of the filter element.

 In FIG. 1 schematically shows a self-cleaning resonant activator filter.

 In FIG. 2 - the appearance of the RAF.

Self-cleaning resonant activator-filter consists of a cylindrical housing 1, at the ends of which are placed the upper 2 and lower 3 covers, with low-frequency sonar emitters 4 and 5, for example, according to A. S. [2]
Inside the housing 1 there is an elastic cylindrical shell 6 fixed with its ends to the housing 1. Between the shell 6 and the housing 1 a gas volume 7 is formed, which is connected by a pipe 8 to a compressed air supply device (not shown).

 A resonant chamber 9 and a filter element 10, which is made in the shape of a glass and fixed with its end face to the tube plate 11, are placed along the axis of the elastic shell 6.

 The filter element 10 and the tube plate 11 divide the resonance chamber 9 into two parts, into the volume into which the original liquid media to be mixed and cleaned through the nozzles 12 and 13, and into the volume 14 with a clean medium exiting the nozzle 15.

 The emitter 4 is placed in the volume 9, and the emitter 5 is placed in the volume 14.

 The nozzles 16 and 17 are designed to remove sludge from the resonance chamber 9.

 On the top cover 2 there is a bleed valve 18.

 Self-cleaning resonant activator filter operates as follows.

 The nozzles 15, 16 and 17 overlap. On the nozzles 12 and 13 in the volume 9 serves a liquid medium to be mixed and cleaned.

When the volumes 9 and 14 are completely filled with liquid medium, the valve 18 closes and the emitter 4 is turned on. The presence of mass m, which is a column of water in volume 9, and elasticities, which are the shell 6 and compressed air in volume 7, creates an oscillating system with a low-frequency intrinsic resonance f _c .

 When the emitter 4 creates a pressure phase, the liquid placed in the volume 9 acts on the elastic shell 6 over its entire surface, and the shell 6, in turn, acts on the air in the volume 7, compressing it.

 When the emitter creates 4 rarefaction phases in volume 9, in liquid and in air, in volume 7, rarefaction phases are also created.

Depending on the specific gravity and wave resistance of the filter element 9, the emitter 5 can be included in the work:
- in antiphase with the emitter 4;
- in phase;
- or not turn on at all.

 Consider the first case when the specific gravity and wave resistance of the filter element 9 are large.

The oscillation frequency f _{u of the} "emitters" 4 and 5 is set equal to the natural frequency of the system f _c , that is, f _u = f _c .

As is known, the natural resonant frequency f _{c of a} system is determined through its mass m and elastic coefficient C. In the initial position, the forces acting on the elastic shell 6, water in volume 9 and air in volume 7 are balanced.

Without considering the elasticity of the shell 7, since it can be negligible, when the piston of the emitter 4 moves in a liquid medium of volume 9 and in the gas volume 7, an excess force F will be applied to the shell 6 due to a change in internal pressure in the volume 7:
F = SΔP, (1)
where S is the surface of the shell, m;
ΔP - change in air pressure in a volume of 7, kg / m ² .

где ΔV =SΔL, (2)
где V - объем воздуха в камере 7, м³;
ΔV - изменение этого объема;
ΔL - радиальное изменение толщины объема 7 (амплитуда колебания оболочки 6).Believing that relationship

where ΔV = SΔL, (2)
where V is the volume of air in the chamber 7, m ³ ;
ΔV is the change in this volume;
ΔL is the radial change in the thickness of the volume 7 (the amplitude of the shell 6).

(3)
из этого следует, что коэффициент упругости системы С

(4)
где Р - давление воздуха в объеме 7, кг/м²;
L - расстояние от оболочки 6 до корпуса 1, м.We get that the acting excess force

(3)
it follows that the elastic coefficient of system C

(4)
where P is the air pressure in the volume of 7, kg / m ² ;
L is the distance from the shell 6 to the housing 1, m

 From the expression (4) it follows that the magnitude of the coefficient of elasticity C is greater, the greater the internal air pressure P in the volume 7, with the surface S of the elastic shell 6 and the distance L between the shell 6 and the housing 1 being constant.

, (5)
где m - масса столба жидкости в объеме 9.It is known that C = mf _c ² , N / m, whence

, (5)
where m is the mass of a liquid column in a volume of 9.

 To adjust the emitters 4 and 5 in resonance with the system, the elastic coefficient C must vary in proportion to the square of the excitation frequency of the emitter 4 of volume 9.

 The emitter 5 is included in operation in antiphase with the emitter 4, i.e., when the volume 9 is the pressure phase, the volume 14 is the rarefaction phase and vice versa.

 The presence simultaneously at the borders of the filter element 10 on the one hand, from the side of the volume 9 of the pressure phase, and on the other hand, from the volume 14 of the rarefaction phase and vice versa, at the natural resonance frequency of the system contribute to intensive and good mixing of two or more media and better pushing of particles medium through the pores of the filter element 10, from the volume 9 to the volume 14. The mixed and purified medium is removed through the pipe 15.

 Particles of mixed and untreated media that did not pass from volume 9 to volume 14 through the filter element 10 are deposited in the form of sludge on the surface of the tube plate 11 and are removed through nozzles 16 and 17, i.e., the filter element self-cleans during operation.

 Thus, creating emitter 4 elastic vibrations in a liquid medium in time, we excite the own resonance of the system, the amplitude of the oscillations of which in the radial direction is much larger than the amplitude from the emitter 4.

 The creation of a self-cleaning resonant activator-filter with a low-frequency resonant system, excitation of this system by vibration exciters, the formation of pressure and rarefaction phases on the filter element at the same time increase the productivity and duration of continuous operation, and its use will allow efficient mixing and cleaning of various media in large volumes.

 When the filter element is removed, two or more liquid media or liquid media and suspended particles are mixed.

 An important advantage of the self-cleaning resonant activator-filter is the fact that during operation of the tank and the design of the device are not exposed to vibrations.

Sources of information
1. I. A. Polevik and others. Acoustic resonator. A. S. 1760540 from 09/07/92

 2. I. A. Polevik, A. G. Polevik. "Electromagnetic Converter", A. S. 1659123, MK B 06 V 1/4 from 06/30/91 Bul. 24.

Claims (1)

 Self-cleaning resonant activator-filter, characterized in that it contains a cylindrical body with caps and nozzles, two emitters, a resonant chamber filled with a liquid medium, an elastic shell and a volume filled with compressed gas, placed between the elastic shell and the housing, a filter element with a tube plate while the filter element is placed on the tube plate and together they divide the resonance chamber into two parts: the volume into which the liquid media to be mixed and cleaned enter, and the volume with clean medium, with one emitter placed in one volume, and the second emitter in the second volume.

Images