RU2350841C1 - Acoustic nozzle to spray fluids - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: acoustic nozzle comprises casing accommodating acoustic oscillation generator representing nozzle and pipe to feed unsoldering agent and liquid. The said casing represents cylindrical sleeve with two air feed channels. Note here that rod with air channel is arranged at the centre of casing and aligned with it. Liquid flows out from the nozzle casing via the pipe, air channel and, at least, two opposed holes onto circular area through resonator washer tapered surface. Note here that the angle between the nozzle axis and direction of each jet from inclined holes favorably varies from 55°÷65°. The pipe is arranged perpendicular to the casing axis to be connected with two air feed channels. The casing houses throttling washer with tapered and cylindrical holes and resonator washer, both aligned with the casing axis. Note that the resonator washer has two 1x3 mm-rectangular-section air nozzles, opposite in direction, and 1.5×3×1.5 mm-cavity resonators. The aforesaid washers are interjointed and fastened to the casing with the help of cartridge clips folded in the casing groove. Resonator inner hole diameter d-to-the rod outer surface diameter d₁ ratio varies in the optimum range of d/d₁=0.34÷0.7, while the resonator inner hole diameter d-to-the inclined hole diameter d₂ ratio varies in the optimum range of d/d₂=1.5÷3.0.

EFFECT: hogher efficiency of spraying.

2 cl, 2 dwg

Description

The invention relates to means for spraying liquids, solutions and can be used in engine building, chemical, food and light industries.

The closest technical solution to the claimed object is an acoustic atomizer - nozzle for AS USSR No. 306270, F 02 C 7/24 of 04/04/70., Comprising a housing with an acoustic oscillator located inside the nozzle and resonator, made in the form of concentric annular slots located in a plane perpendicular to the axis of the housing, a ring with a conical surface, associated with the housing and the atomizer, which serves to form a liquid film that blocks the exit from the generator, and is fixed in the housing by means of a hollow rod with a screw swirler at the end and a shoulder for placing an annular platform onto which Fluid from the nebulizer (prototype).

A disadvantage of the known acoustic nozzle is that it does not provide a high degree of atomization.

The technical result is an increase in spraying efficiency.

This is achieved by the fact that in an acoustic nozzle for spraying liquids, comprising a housing with an acoustic oscillation generator arranged in the form of a nozzle and a resonator and a tube for supplying a spraying agent and liquid, the housing is made in the form of a cylindrical sleeve with two channels for supplying air, with the center of the housing, a rod is located with the air channel coaxial to the housing, while liquid from the nozzle housing through the tube, the air channel and at least two opposing openings flows to the annular area through the conical surface of the resonator washer, and the angle between the axis of the nozzle and the direction of each jet of liquid from the inclined holes lies in the optimal range: 55 ÷ 65 °, and perpendicular to the axis of the housing is a tube that is connected to two channels for supplying air, and in the housing, coaxial to its axis, a throttle washer with a conical bore and a cylindrical one and a resonator washer are located, in which two oppositely directed air nozzles of rectangular section 1 × 3 mm in size and at least two volumes are made mnyh resonator size 1,5 × 3 × 1,5 mm, the washers bonded to each other and to the housing by clips that are rolled in the groove of the housing.

In Fig.1 shows a frontal section aa of an acoustic nozzle for spraying liquids, in Fig.2 is a profile projection of Fig.1.

The acoustic nozzle for spraying liquids contains a housing 3 made in the form of a cylindrical sleeve with two channels 10 for supplying air. In the center of the housing there is a rod 16 with an air channel 8 coaxial to the housing. The liquid from the nozzle body 3 through the tube 2, the air channel 8 and at least two opposing openings 15 flows to the annular platform 17 through the conical surface 14 of the resonator washer 6. The angle between the axis of the nozzle and the direction of each jet of liquid from the inclined holes 15 lies in the optimal range: 55 ÷ 65 °. As a result of the spreading of the liquid jets, a thin film is formed over at least two outlet openings 11, where this film is crushed by a pulsating stream of air coming from the resonator 4. A pipe 1 for supplying air is located perpendicular to the axis of the housing 3, which is connected to two channels 10 for supplying air . In the housing, coaxial to its axis, there is a throttle washer 7 with a conical hole 12 and a cylindrical 13 and a resonator washer 6. In the resonator washer 6 there are two oppositely directed air nozzles 5 (rectangular section 1 × 3 mm) and at least two volume resonators 4 (size 1.5 × 3 × 1.5 mm). The washers 6 and 7 are fastened together and with the housing 3 by means of a holder 9, which is rolled in the groove 18 of the housing 3.

For the operation of the nozzle in optimal mode, the following ratios of its parameters are provided:

the ratio of the diameter d of the inner hole of the air channel 8 of the resonator 4 to the diameter d _{1 of the} outer surface of the rod 16 lies in the optimal range of values:

d / d ₁ = 0.3 ÷ 0.7;

the ratio of the diameter d of the inner hole of the air channel 8 of the resonator 4 to the diameter d _{2 of the} inclined holes 15 lies in the optimal range of values:

d / d ₂ = 1.5 ÷ 3.0.

The acoustic nozzle for spraying liquids works as follows.

The spraying agent, for example air, is supplied through a tube 1, then through channels 10 made in the housing 3. Then it enters through holes 12 and 13 in the throttle washer 7 and through the conical surface 14 of the resonator washer 6, bypassing the resonator 4, through the holes 11 and the air nozzle 5 exits in the direction of the inclined openings 15. The liquid from the nozzle body 3 through the tube 2, the air channel 8 and at least two opposing openings 15 flows to the annular platform 17 through the conical surface 14 of the washer 6. Acoustic vibrations of the atomizing atom coagulant promote a finer atomization of the solution fed into the annular gap, thus, pass, it generates acoustic vibrations acting on the fluid jet. The specified nozzle provides good spray quality at low air flow rates. The experiments showed that at an air pressure of 100 kPa, the average droplet diameter is 90 μm, with an increase in air pressure by about 4 times (up to 400 kPa), the average droplet diameter decreases slightly and amounts to 87 μm.

Claims (2)

1. An acoustic nozzle comprising a housing with an acoustic oscillator located inside the nozzle and resonator and a tube for supplying a spraying agent and liquid, characterized in that the housing is made in the form of a cylindrical sleeve with two channels for supplying air, with a rod located in the center of the housing with an air channel coaxial with the body, while liquid from the nozzle body through the tube, the air channel and at least two opposing openings flows to the annular platform through a conical surface the resonator washer, and the angle between the axis of the nozzle and the direction of each jet of liquid from the inclined holes lies in the optimal range of 55 ÷ 65 °, and perpendicular to the axis of the housing is a tube that is connected to two channels for supplying air, and located in the housing coaxially with its axis a throttle washer with a conical bore and a cylindrical and a resonator washer, in which two oppositely directed air nozzles of rectangular section 1 × 3 mm in size and at least two volume resonators are made m 1.5 × 3 × 1.5 mm, while the washers are fastened to each other and to the casing by means of a cage, which is rolled in the groove of the casing. 2. The acoustic nozzle according to claim 1, characterized in that the ratio of the diameter d of the inner hole of the resonator to the diameter d _{1 of the} outer surface of the rod lies in the optimal range of values d / d ₁ = 0.3 ÷ 0.7; the ratio of the diameter d of the inner hole of the resonator to the diameter d _{2 of} inclined holes lies in the optimal range of values d / d ₂ = 1.5 ÷ 3.0.

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