SU525483A1 - Electro-acoustic device - Google Patents

Description

one

The invention relates to the use of sound and ultrasonic vibrations in various technological processes and can be used, in particular, as a miniature pumping device in medicine, space technology, and chemical production.

Electroacoustic devices are used that are used in various technological processes associated with the treatment of liquids.

Of the known electroacoustic devices, the closest in technical essence to the proposed one is that the device contains a piezoelectric mechanical oscillator with a secondary transducer. Moreover, in the secondary transducer there is a through dilidic hole and there is a system of pipelines for receiving and supplying fluid.

However, such devices are characterized by the impossibility of creating a pumping effect.

The purpose of the invention is to obtain a pumping effect.

For this purpose, in a housing between vibrators, for example, piezoelectric rings and a membrane, a membrane is placed in the form of a thin flexurally oscillating plate on one of its own parts, which has openings with sockets of variable cross section. Moreover, the sockets can be located on one or both sides of the plate, forming diffusers and confusors.

10 FIG. 1 shows a diagram of the proposed device; in fig. 2 - forms, sockets.

Claims (3)

The electroacoustic device has a housing 1 with inlet 2 and outlet 15 3 nozzles. Inside the case there is a plate 4 with holes 5 and sockets 6, an electro-acoustic vibrator 7, for example, piezo-ceramic rings, separated from the case by insulating pads 8. 20 A variable electrical voltage of fixed frequency is applied to the plates of the piezoceramic ring 7. The transverse oscillations of the piezoceramic ring excite the bending vibrations of the plate 4, 25 The frequency of the electric voltage oscillations corresponds to one of the modes of the bending vibrations of the plate 4. Holes 5 with races 6 are located at the antinodes of the plate displacement. Fig. 2 shows that the sockets can be made in the form of diffusers (a) and confusors (b). The operation of a separate hole with a socket is as follows. The spout is moving relative to liquid. If the Reynolds Cree-Series does not reach a critical value during this movement, then the Bernoulli law P, J VJf - Pl -f4 a f-f and Pg are the static pressures correspondingly at the inlet and outlet of the socket, respectively, for the movement of fluid inside the socket; L and P is the height of the fluid level above the ground, respectively, at the inlet and outlet of the pipe; V, and 3 are the velocities of fluid motion through the entrance and exit hinges, respectively; p is the density of the liquid; and - acceleration of free fall. Since the height of the socket is small (j-i-:), the proportion of hydrostatic pressures at the height of the socket can be neglected. Consequently, p.-f.-iK-v :) I Let the tree move along the garm, the atomic law, i.e. Y V cosuji, M (u; t-4) W COs () - Y -tos4Li t) where oi is the circular frequency; t is the current time; С - brackets, meaning averaging over time. § Г 2. а / ч 2. 2., О Ра J г у.2. I with 3 Gt T l-- () T Wtot p l PrPP.4 (). (H W / - 1 It follows from the obtained equation (1) that regardless of the direction of the fluid velocity, and therefore, regardless of whether the bell moves up or down, there is a PERMANENT pressure drop between the wide and narrow section of the socket. pressure from the narrow to the narrow section transports fluid through the socket during its oscillations. The critical value of the Reynolds number, for example, for water, is 1000. This means that for a socket with a wide cross-section diameter of 0 5 mm Bernoulli's law will be right driving even at vibrational speeds of 10 m / s, i.e., a spray can fluctuate, for example, with a frequency of i 10 Hz and an amplitude of 1 mm, and the relation (1) will be true. Thus, all oscillating openings with sockets create equally directed drops, pressures regardless of whether they oscillate in phase or in antiphase. Claim 1. An electroacoustic device comprising a housing with inlet and outlet nozzles and vibrators with insulating gaskets, characterized in that, in order to obtain us The axial effect, in the case between vibrators, for example, piezoelectric rings, is a membrane in a vice thin plate that oscillates flexibly on one of the natural frequencies of the plate, which has openings with sockets of variable cross section in the antinodes of the oscillatory velocity. 2. Device POP.1, characterized in that the sockets are open, on one side of the plate so that they form either diffusers, or confusors. 3. The device according to Claim 1, which means that the sockets are open on both cTopoHbj plates, so that on one hundred ° cTopoHbj plates, so that there are diffusers on one c ron and on the other there are. Tf .. but G / / / FIG. 2