RU2352373C2 - Multiphase fluid feeding and dispensing nozzle - Google Patents

Abstract

FIELD: fire safety.

SUBSTANCE: invention refers to fire-control engineering and can be used for fire-fighting, spraying, cooling, airing in multiphase fluid feeders. The result is ensured as follows. Multiphase fluid feeding and dispensing nozzle contains the housing with the internal flow passage mounted on the supply tube. According to the solution the nozzle housing is lengthwise cut along the jet end thus forming the periodic element crowned at the ends. The nozzle housing is fixed to the tube through the damping tubular and enveloped on the external surface of the jet end. Herewith lengths of the lengthwise cuts on the jet end are different. The periodic elements are crowned at the ends thus observing aerodynamically active form. Damping tubular element represents a rolling diaphragm, while the envelope is fixed with a lock-nut.

EFFECT: ensured result is improved dispersion of supplied multiphase fluid, lower hydraulic resistance and structural complexity of the nozzle, possibility to obtain high consumption indicators in dispersing multiphase fluids, improved reliability and technological effectiveness.

5 cl, 4 dwg

Description

The invention relates to fire fighting equipment and can be used for fire extinguishing, irrigation, cooling, aeration in devices for supplying multiphase fluid media.

Known nozzles for creating a water spray of an aerosol type, comprising a housing with a flow part, characterized in that the flow part consists of a coaxially located Laval nozzle and a distribution grid having hole sizes equal to 0.3-1.0 diameter of the critical section of the Laval nozzle for selective feeding a directed gas-liquid flow or moving water curtain, while a container with a chemical composition in the form of a surfactant, for example, based on alkyl, is fixed to the nozzle by means of locks sodium sulfonate absorbed silica gel chemical composition for administration at a distance of 0.2-0.4 m from the nozzle / RU № Patent 2123871, 1998 /.

Known nozzles are limitedly applicable without pre-heating the extinguishing fluid above the boiling point, has high hydraulic resistance and is not applicable for high fluid flow rates.

Known nozzles for a device for supplying a moving medium, comprising a housing with a working section having a screw channel of non-circular cross section, characterized in that the working section is made in the form of a thin-walled elastic shell in the shape of a screw channel, and the wall thickness is made variable along the length of the shell / RU Patent No. 2099114, 1997 /.

Known nozzles are of little use for producing a dispersed jet of multiphase fluid media.

Known nozzles containing a housing and a nozzle, characterized in that the housing is made in the form of a hollow ball, the radius of the inner sphere of which is larger than the largest nominal bore of the nozzle, while the nozzle has a non-circular section of the inner channel located on the screw surface, and the housing is at the junction with a nozzle has a window of non-circular cross section / Patent RU No. 2090228, 1997 /.

Known nozzles are of little use for producing a dispersed jet of multiphase fluid media.

The closest is a pneumatic-acoustic spray device containing a resonator, gas and water nozzles, a rod installed with a gap relative to the gas nozzle, characterized in that the gap in it is chosen equal to (0.03-0.055), and the cavity depth h = (3, 0-5.0), while the wavelength of acoustic radiation at the operating frequency for an inert gas / Patent RU No. 2130328, 1999 /.

The known device has a high hydraulic resistance, is not applicable for high liquid flow rates and for producing a dispersed jet of multiphase fluid media, it is not technologically advanced to use.

The objective of the invention is to increase the dispersion of the supplied flow of a multiphase fluid medium, reduce hydraulic resistance and structural complexity of the nozzle, ensure high flow rates when spraying the flow of multiphase fluid media, increase the reliability and manufacturability.

The problem is solved in that in the nozzle for supplying and spraying a multiphase fluid medium containing a housing with an internal flow channel mounted on the supply pipe, according to the solution, the nozzle body is made with longitudinal cuts on the nozzle part and the formation of oscillating elements provided with bulges at the ends, the nozzle body fixed to the nozzle through a vibration-damping tubular element and provided with a protective sheath fixed to the outer surface of the nozzle part, with longitudinal sections at the nozzle part made of different lengths, bulges at the ends of vibrational elements are aerodynamically active form, the tubular member is a blanking vibration bellows, and the protective sheath is fixed nut.

Distinctive features are:

- the nozzle body is made with longitudinal cuts on the nozzle part and the formation of oscillating elements provided with bulges at the ends (which ensures stable initiation of vibration processing of the stream and dispersion of the particles of the stream);

- the nozzle body is fixed to the nozzle through a vibration-absorbing tubular element (which prevents the propagation of vibrations and improves the usability of the nozzle);

- the nozzle body is equipped with a protective shell fixed on the outer surface of the nozzle part (which ensures the reliability and durability of the oscillating elements and the nozzle itself);

- longitudinal sections on the nozzle part are made of different lengths (which allows the oscillating elements to vibrate at different frequencies and to introduce the nozzle body into the resonant mode of vibrations with intensification of the effect on the flow and the degree of dispersion of the latter, to reduce the hydraulic resistance of the nozzle);

- the bulges at the ends of the oscillating elements are made of an aerodynamically active form (which allows even at relatively low flow velocities to actively vibrate the oscillating elements and resonate the nozzle body);

- vibration-absorbing tubular element is a bellows (which, with simplicity and manufacturability, prevents the spread of vibration to the supply pipe);

- the protective shell is fixed with a lock nut (which increases the reliability of fastening in the resonant mode of vibration of the nozzle body)

Comparison of the proposed solutions with analogues and other known solutions did not allow to identify in them the features that distinguish the claimed solution from the prototype, which allows us to conclude that the criterion of "inventive step".

The invention is illustrated by drawings, in which Fig. 1 shows a general view with a section, in Fig. 2 - an oscillating element with a convexity of an aerodynamically active shape, Fig. 3 - view A - nozzle part of the nozzle, Fig. 4 - scan along BB of the nozzle part .

The nozzles for supplying and spraying a multiphase fluid medium comprises a housing 1 with an internal channel 2, longitudinal sections 3, oscillating elements 4, convexities 5, a supply pipe 6 with a supply channel 7 and perforations 8, a bellows 9, a protective shell 10, a lock nut 11.

The nozzle works as follows.

Liquid enters the supply pipe 6, mixing with the gas entering through the perforations 8 of the supply channel 7, and is released under pressure through the nozzle part of the nozzle body 1 through the internal flow channel 2. When the flow moves, the latter flows around the bulge 5 of the vibrational elements 4, while on each bulge due to the aerodynamically active form there is a deflecting force directed to the flow axis. The uneven flow initiates the vibration of the oscillating elements 4, while each of them vibrates at its own frequency based on the different lengths of each element, determined by the different lengths of the longitudinal sections 3. Housing 1 starts to work in the resonant chamber mode. A wide frequency range allows you to initiate resonant vibrations of the housing 1 with changes in the pressure characteristics of the flow and intense high-frequency processing of a fluid in a resonant chamber with additional mixing and homogenization of the composition of the stream. The convexities of the aerodynamically active form at the exit of the nozzle form an expanding surface that is close in configuration to the initial and most active zone of the Laval nozzle, which initiates intense dispersion of the flow. Dispersion increases due to the high-frequency vibration of the elements forming the flow separation surface. Low hydraulic resistance allows pumping through the nozzles various phase composition flows with the inclusion of emulsions for the formation of foam, suspensions and fluidized powder components. The gap between the outer generatrix of the oscillating elements and the inner surface of the protective sheath 10 provides oscillations of the elements 4 with a maximum amplitude corresponding to the length of each element, and the lock nut 11 prevents the unscrewing of the connection of the protective sheath - case with resonant vibrations. The bellows 9 prevents the transmission of vibration to the supply pipe 6, which ensures the reliability and stability of the device as a whole. Nozzles for supplying and spraying a multiphase fluid medium provide an increase in the dispersion of the feed stream of a multiphase fluid medium, a decrease in hydraulic resistance and structural complexity of the nozzle, it allows to achieve high flow rates when spraying a stream of multiphase fluid media, and to increase reliability and manufacturability.

Claims (5)

1. Nozzles for supplying and spraying a multiphase fluid medium, comprising a body with an internal flow channel mounted on a supply pipe, characterized in that the nozzle body is made with longitudinal cuts on the nozzle part and the formation of oscillating elements provided with bulges at the ends, while the nozzle body fixed to the pipe through a vibration-damping tubular element and provided with a protective shell fixed to the outer surface of the nozzle part. 2. Nozzles according to claim 1, characterized in that the longitudinal sections on the nozzle part are made of different lengths. 3. Nozzles according to claim 1, characterized in that the bulges at the ends of the oscillating elements are made of an aerodynamically active shape. 4. Nozzles according to claim 1, characterized in that the vibration-absorbing tubular element is a bellows. 5. Nozzles according to claim 1, characterized in that the protective sheath is fixed with a lock nut.

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