SU914097A1 - Apparatus for pneumomechanical spraying of liquid - Google Patents

Description

liquid spraying and can be used in the production of chemical fibers, in particular when applying antistatic and other finishing preparations to continuously moving tow fibers or non-woven materials, as well as in climatic installations for humidification of air, in medicine for spraying medicines, in agriculture for spraying pesticides.

A device for pneumomechanical spraying liquid containing an ejector and nozzles with sequentially mounted coaxial nozzles [13.

The disadvantage of this device is the impossibility of uniform coating on the tape material due to the inability to obtain with it a homogeneous jet of a flat shape.

the possibility of uniform coating of the tape material.

This goal is achieved by the fact that in a device for pneumomechanical spraying a fluid containing an ejector and nozzles with sequentially mounted nozzles, the latter are made in the form of diaphragms with slit-like openings fixed across the nozzle.

The distance between the diaphragms and the length of the slit-like hole are selected to be greater than the width of the slit-like hole by at least 10 times, and the thickness of the diaphragm is selected less than the width of the slit-like hole, by no more than 3 times.

In FIG. 1 shows a device, a longitudinal section; in FIG. 2 - the same, transverse section.

The device for pneumomechanical spraying comprises an ejector including a nozzle 1 for supplying a spray and an insert 2 with a cylindrical chamber 3, a confuser 4 and a diffuser 5 ”. The insert 2 is equipped with a nozzle 6 for supplying liquid. The device also contains nozzles 7 with sequentially mounted 5 coaxial nozzles in the form of diaphragms 8 mounted across the nozzle with slit-like openings 9, which divide nozzles 7 into sections 10. On the inner surface of the nozzle 7, between the 10 diaphragms 8 are made ring wedge-shaped protrusions 11.

The distance between the diaphragms and the length of the slit-like opening is selected to be no less than 10 times the width of the slit-like opening 15, and the thickness of the diaphragm is chosen to be less than 3 times the width of the slit-like opening.

The device operates as follows "

A nozzle is fed through a nozzle 1 under a pressure of up to 6.0 atm, which creates a vacuum at the inlet of the cylindrical 25 chamber 3 of the insert mixing chamber 2 due to the ejection effect. ”The sprayed liquid supplied through the nozzle 6 (for example, an antistatic solution) is drawn into the cylindrical chamber 3 mixing, in which the pre-mixing of the liquid and the spray "

The jet of the mixture, increasing its speed in the confuser 4 of insert 2, flows out into the first section of the nozzle ₃₅ . The central stream (core) enters the slit-like opening 9. The large peripheral part of the stream hits the diaphragm 8 (liquid droplets are crushed ₄₀ ), it is reflected from the wedge-shaped protrusion 11 and forms a circulation flow in the nozzle section 7. (shown by arrow)

Annular wedge-shaped protrusions 11 direct the circulation flow again to the core of the jet flowing from the slit-like opening 9, which ensures the absence of stagnant zones in the sections 10. When the central and peripheral jets interact, further dispersion of the liquid.,

The sequential outflow of the mixture stream through several sections of the nozzle (practically, their number should be at least three) and the absence of stagnant zones in the sections ⁵⁵ increases the dispersion of the sprayed liquid, makes the stream homogeneous over the entire cross section, and transforms it from cylindrical to flat, Moreover, the larger the number of sections, the higher the dispersion and uniformity of the jet (i.e., depending on the purpose of the nozzle, it is possible to control the dispersion) and the lower the consumption of an expensive atomizer, the energy of which is spent on the disperser liquid during the flow through slots and in secondary circulation flows. For example, with fifteen diaphragms and slit sizes of 1.0 x x 20 mm, 10 to 50 kg / h of a 10% aqueous solution of the antistatic preparation DS-20 were sprayed to sizes particles less than 100 microns. The flow rate of compressed air at a pressure of 4.0 ati was 0.7 m ³ / h.

The use of the invention will allow evenly applying small amounts of surface-active substances (antistatic and sizing agents, adhesives and ToD ") to continuously moving wide tape materials, such as tows and canvases of chemical fibers, non-woven materials, fabrics" When continuously processing fibrous materials using a spreader, the dimensions of which correspond to their width, the device can be positioned close to the material being processed.

In this case, the jet penetrates the entire thickness and the sprayed liquid, filtering off, processes the material over the entire cross section, and not just its surface.

Due to the fact that the liquid and air flow out of the slots with a relatively large cross section, they do not become clogged. "The device works stably for a long time in the set mode, ensuring high quality products"

The ability to reduce spray consumption eliminates the use of equipment for cleaning the spent spray "

Claims (2)

Claim 1. A device for pneumomechanical spraying of liquid, containing an ejector and nozzles with sequentially mounted coaxial nozzles, characterized in that, in order to ensure uniform coating on the tape 5 914047 ⁶ material, the nozzles are made in the form of diaphragms with slit-like openings fixed across the nozzle. . 2 “The device according to claim 1, characterized in that the distance between the diaphragms and the length of the slit-like opening of the diaphragm are selected to be no less than 10 times the width of the slit-like opening, and the thickness of the diaphragm is selected to be less than 3 times the width of the slit-like opening times.