FR2546080A1 - ATOMIZATION NOZZLE - Google Patents

Abstract

1. Spray nozzle with hemispherical head comprising two slots (14) which are symmetrically arranged with respect to a plane (X-X) containing the axis (Y-Y) of the nozzle and the median planes of which are sloping with respect to the said symmetry plane, characterized by the fact that both slots (14) are arranged so as to produce a common stream, by the fact that the angle (alpha) formed by the median plane of each slot with the symmetry plane (X-X) lies between 5 degrees and 40 degrees, and by the fact that both ends of the slots (14) are located at the bottom level of the hemispherical head (12) of the nozzle and spaced from the said symmetry plane.

Description

The present invention relates to atopic devices

  of the type in which the splitting of the liquid into fine droplets and suspending them in a stream of air takes place inside the body of the atomizer and the mixture thus formed is driven at high speed to through an elongated opening in a nozzle with a hemispherical head so as to produce a flat jet of great width These devices are used in particular for cooling the casting products

keep on going.

  In known devices of this type the nozzle

  carries a single slot producing a relatively thin stream.

  The thickness of the jet can be increased by increasing the

  slot, but the jet is no longer homogeneous.

  However, for certain applications, especially for cooling

  bloom dyeing produced by a continuous casting machine, we seek to obtain thicker and homogeneous jets throughout their section The purpose of the invention

  is to provide a nozzle to achieve this result.

  The atomization nozzle which is the subject of the invention is

  terized in that it has two slots arranged symmetrically

  with respect to a plane containing the axis of the

  nozzle, in that the median planes of the slots are parallel

  at or inclined at an angle not greater than 40

  port to said plane of symmetry, and in that the ends of the slots are located approximately at the base of the hemispherical head of the nozzle and away

of said plane of symmetry.

  Different forms and provisions can be

  chosen for the slots, depending on the desired result.

ket.

  The following description refers to the drawings

  which show, by way of non-limiting examples, some embodiments of the invention and in which Figure 1 is an elevational view of a nozzle made according to the invention; FIG. 2 is an end view of this nozzle. FIG. 3 is a view along arrow F of FIG. 1 showing the shape of the nozzle slots. FIG. 4 is an elevational view of another compliant nozzle. to the invention; Figure 5 is a view along the arrow F of Figure 4; and

  Figures 6 and 7 are views similar to the

  Figure 5 illustrates other forms of slits.

  The nozzles shown in the drawings are

  killed by a piece 10 in the form of a thimble having a hemispherical head 12 in which are machined two slots 14 at its base, the part 10 has an annular shoulder 16 for fixing, to the nut saoyen, on the end threaded body of an atomizer Pins 18 allow to ensure the correct positioning of the

nozzle on the body of the atomizer.

  The slots 14 are symmetrical with respect to an X-X plane containing the Y-Y axis of the nozzle They have the shape of a semicircle and their ends are located

  approximately at the base of the hemispherical head

  phérique 12 (Z Z plane) and away from the plane of symmetry X-X. In the embodiment of FIGS. 1 and 2, the slots have parallel edges and their median planes are inclined by an angle θ equal to about 200 with respect to the plane of symmetry in projection on a plane perpendicular to their median plane and to the plane of symmetry. In the figure (arrow F), these slots have an approximately trapezoidal shape, as shown in FIG. 3. These slots are produced by milling using a saw-cutter or a three-milling cutter.

  sizes on a universal milling machine with tilting head.

  In the embodiment of FIG. 4, the slots which are arranged in the same way as on the nozzle

  Figures 1 and 2 have a width which decreases

  placed in the middle In projection on a plane perpendicular

  at their median plane and at the plane of the figure (arrow F) these slots have the shape shown in FIG. 5, the longitudinal edges having in this representation a 3-shaped curve, for example in an arc of a circle. The slits comprise two phases: planar and parallel lip slots are first formed by milling, and then the lips are given a curved shape by combining an alternating cutting movement and a circular advance movement.

  Alternatively, these slots could be

  such as, represented as in Figure 5, their

  longitudinal edges consist of broken lines

  two segments (Figure 6), three segments (Figure 7)

or more.

  In the example of Figure 6, the slots are made by milling, by means of a milling cutter, in two passes with rotation of the plane of the milling cutter between the two passes to achieve the nozzle of Figure 7, where the slots have a constant width in the area located at

  halfway between the ends, a third pass is necessary.

  to machine the middle part.

  The inclination of the median plane of the slots with respect to the plane of symmetry of the nozzle may vary from 0 (slots

  parallel to the median plane) at 400.

  Other forms could be given to the slots

  without departing from the scope of the invention.

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RE V E N D I C AT IONS

  1 atomizing nozzle with a hemispherical head producing a flat jet of great width, characterized in that it

  has two slots (14) formed on the hemispherical head

  (12) and arranged symmetrically with respect to a plane (XX) containing the nozzle axis (YY), in that the median planes of the slots are parallel to or inclined at an angle (C <) at most equal to at 400 relative to said plane of symmetry, and in that the ends of the slots are located approximately at the base of the hemispherical head (12) of the nozzle and at

the deviation of said plane of symmetry.

  2 spray nozzle according to claim 1, characterized in that said slots have a constant width on

their entire length.

  Spray nozzle according to claim 1, characterized in that said slits have a decreasing width

  from their ends to their middle or to the

swimming of it.