EP2054159A2

EP2054159A2 - Nozzle with adjustable-delivery rotary jet

Info

Publication number: EP2054159A2
Application number: EP07803793A
Authority: EP
Inventors: Stéphane GUERINEAU
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-07-20
Filing date: 2007-06-27
Publication date: 2009-05-06
Also published as: WO2008009787A2; FR2903920B1; WO2008009787A3; FR2903920A1

Abstract

The invention relates to a nozzle (1) with a rotary jet, of the type formed of a static envelope (2) delimiting an open cavity (3) housing an injector (4) in which one end (4A) of the injector is driven in a circular path within a widened section (2A) of the envelope (2) under the effect of a fluid pressure with tangential delivery acting on said injector (4) while the other end (4B) of this injector (4) is housed in the opening (5) of the cavity (3) which is shaped in the form of a concave seat allowing the precessing movements of the injector (4). This nozzle is characterized in that it comprises, on the fluid inlet side, a static bushing (6) closed at its injector end (6A) by a transverse wall (7), the bushing body (6) having, near said transverse wall (7), radial orifices (8) that are directed in such a way as to generate, within the cavity (3) of the envelope (2), a swirling fluid flow that transmits its movement to the injector (4), said radial orifices (8) of the bushing (6) being regulated in terms of delivery by means of a controlled shutter (9).

Description

Rotating jet nozzle with adjustable flow

The present invention relates to a rotating jet nozzle of the type formed of a static envelope delimiting an open cavity housing an injector.

It relates more particularly to a jet nozzle with an injector end is driven in circular displacement within an enlarged section of the envelope under the effect of a tangential flow water pressure acting on said injector while the other end of this injector is housed in the opening of the shaped cavity in the form of a concave seat allowing the precession movements of the injector.

Such jet nozzles are particularly used in the case of cleaning installation. Indeed, a rotating jet combines the advantages of a flat jet and a straight jet or pencil because it has in terms of impact forces the same characteristics as a straight jet and can cover a surface substantially equivalent to that of a flat jet. For a long time, these nozzles were fed with high pressure fluids. More recently, there appeared on the market of jet nozzles sized to be able to be fed with a medium pressure fluid between 20 and 80 bar. However, such nozzles do not give full satisfaction today. In particular, malfunctions of such nozzles are observed in the case of pressure variations on the fluid supply circuit of said nozzle. These malfunctions result in particular by a partial or total stop of the rotation of the injector inside the casing of the nozzle, because the fluid no longer exerts sufficient force to rotate the injector. The fluid then flows directly through the seat of the nozzle without passing through the injector. These malfunctions are also observed when the pressure inside the envelope is much greater than the recoil force of the nozzle which is generated by the flow of the injector.

These malfunctions are also observed when the recoil force of the nozzle, generated by the flow rate of the fluid and / or by the support of the fluid flow on the support to be treated, is greater than the pressure prevailing inside the the envelope of the nozzle. In this case, either the injector retracts inside the cavity of the casing and no longer rotates, or the bearing force of the injector on the cavity is too small, the injector no longer describes a circular motion homogeneous in the envelope and then turn too fast. It is therefore essential to maintain the pressure inside the nozzle casing to a value greater than or close to the recoil force to avoid any malfunction.

An example of a rotating jet nozzle is described in document DE 42 24 664. This rotating jet nozzle is formed of an envelope delimiting an open cavity housing an injector, an injector end of which is driven in circular displacement at the nozzle. inside an enlarged section of the envelope under the effect of a fluid pressure acting on said injector, while the other end of this injector is housed in the opening of the shaped cavity in the form of a seat concave allowing the precession movements of the injector. This nozzle comprises fluid inlet side, a sleeve partially closed at its end injector side by a transverse wall equipped with axial ducts opening into the cavity of the casing. These axial ducts are of adjustable section by relative movement of the sleeve and the casing. This nozzle is characterized by its complexity which results from the fact that the adjustment is effected by relative movement of the sleeve and the envelope, which are not static elements. Because of this configuration, the adjustment possibilities resulting from a sectional difference of the cone-shaped axial passages formed between bushing and casing are small and do not allow adjustment within a wide range. Therefore, for low pressure operation, this nozzle must have additional conduits for discharging fluid out of the nozzle generating a significant loss of fluid, it being understood that this fluid discharge requires a third moving part capable of closing or open these additional conduits. This therefore results in the need, in view of such a nozzle, to simplify the design of such a nozzle by limiting the number of moving parts, to increase the adjustment possibilities in terms of pressure range without having to evacuate fluid to the nozzle. outside of said nozzle. US 6 230 984 discloses a shower nozzle formed again of a fluid supply pipe or sleeve closed by a transverse wall at one of its ends and an envelope threaded on this pipe and movable axially by relation to said conduct. There is therefore again an assembly in which casing and sleeve are driven by an axial relative movement allowing a flow rate adjustment. The envelope delimits a plurality of cylindrical housings angularly distributed uniformly about the longitudinal axis of the nozzle, each housing receiving an injector. This injector is driven in circular displacement under the effect of a substantially axial flow fluid pressure acting on said injector. Consequently, such a nozzle does not make it possible to respond to the technical problem posed by the outlet of the ducts inside the cavities of the casing, this outflow having a substantially axial orientation, which is incapable of guaranteeing effective entrainment of the injector.

DE 43 19 743 discloses a controlled shutter-free jet nozzle for adjusting the flow rate of fluid supplying the cavity housing the injector.

US 5,722,592 again describes a rotating jet nozzle in which the sleeve body has in the vicinity of its transverse wall one and only one radial office. The flow rate of this orifice is obtained by a relative movement between the casing and the sleeve.

In conclusion and in all the foregoing, the rotating jet nozzles each comprise, for their adjustment, the necessity of relatively moving the envelope and a socket closing the open cavity of said envelope. However, it is known that if the flow of fluid does not have the flow and the required orientation inside the nozzle body, it results in stopping the rotational drive of the injector.

An object of the present invention is therefore to propose a rotating jet nozzle whose design makes it possible to manage the pressure prevailing inside the casing of the nozzle with respect to the recoil force to prevent any stop of the rotational drive of the injector.

Another object of the present invention is to provide a rotating jet nozzle whose design allows to work within a large pressure range while ensuring the rotation of the injector within said range.

Another object of the present invention is to provide a rotating jet nozzle whose design makes it possible to guarantee the orientation of the flow of fluid inside the nozzle body, and to accurately determine the inner zone of the nozzle body struck. by said flow.

For this purpose, the subject of the invention is a rotating jet nozzle of the type formed of a static envelope delimiting an open cavity housing an injector, one injector end of which is driven in circular displacement inside an enlarged section. of the envelope under the effect of a tangential flow fluid pressure acting on said injector while the other end of this injector is housed in the opening of the shaped cavity in the form of a concave seat allowing movements precession of the injector, characterized in that the nozzle comprises, on the fluid inlet side, a static socket closed at its injector end by a transverse wall, the socket body having, in the vicinity of said transverse wall, radial orifices oriented to generate, within the cavity of the casing, a swirling fluid flow transmitting its movement to the injector, said radial orifices of the a bushing being regulated in flow through a controlled shutter.

The presence of a shutter acting on a static assembly makes it possible to regulate the flow rate of the fluid flow and consequently the pressure inside the cavity of the nozzle so as to guarantee, within a wide range of fluid flow pressure feeding the nozzle, a rotation of the injector without having to evacuate fluid out of the nozzle. The presence of a static assembly makes it possible to guarantee the orientation of the flow of fluid inside the nozzle body and to accurately determine the zone struck by said flow.

In a preferred embodiment of the invention, the shutter is a rotating part provided with radial orifices connected to each other by solid parts, the radial or respectively the solid portions being positionable facing the radial orifices of the socket when a shutter rotation drive to adjustably close said radial holes in the bushing according to the desired flow rate.

Thanks to this embodiment of the shutter in the form of a rotating part and not to axial displacement, the angle or orientation of the fluid flow is not modified during the obstruction of the orifices as may be the case when an axial movement of the shutter which tends during its displacement to come crush the jet of fluid changing its angle and shape.

In a preferred embodiment of the invention, the shutter has the shape of a duct housed inside the bushing, this duct being closed at one end by a transverse wall and connectable at its other end to an inlet. of fluid, the radial orifices connected to each other by the solid parts, being arranged in the vicinity of the transverse wall of said duct, the radial orifices or, respectively, the solid parts, being positionable facing the radial orifices of the socket during a driving in rotation of the conduit to adjustably close said radial holes of the sleeve according to the desired flow rate.

In another embodiment of the invention, the shutter has the shape of a ring capping the end provided with radial holes of the sleeve, this ring being provided with radial orifices connected by solid parts, the radial orifices or respectively the solid parts that can be brought into total or partial correspondence with the radial orifices of the socket when angular displacement of the ring according to the desired flow.

Thus, independently of the embodiment chosen in these preferred configurations, the shutter is, in each case, a tubular, annular or cylindrical rotary part, the radial orifices connected by solid parts being distributed generally circumferentially around the periphery of the tubular body of the shutter, this tubular body can be blind or through.

The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawings in which:

Figure 1 shows a schematic sectional view of a rotating jet nozzle, the shutter having been partially introduced into the sleeve;

2 shows a schematic sectional view of the shutter in the partial closure position of the orifices of the sleeve fitted to the nozzle;

Figure 3 shows a schematic sectional view of another embodiment of a socket / shutter assembly;

Figure 4 shows a cross-sectional view of Figure 3 taken at the radial ports of the sleeve and the shutter;

FIG. 5 is a schematic sectional view of another embodiment of a socket / shutter assembly and

FIG. 6 represents a cross-sectional view along A-A of FIG. 5.

As mentioned above, the nozzle 1 rotating jet object of the invention is formed of a static envelope 2 defining an open cavity 3. This static envelope 2 here affects the general shape of a tubular body open at each of its ends to form a fluid inlet and an outlet of fluid. This body affects the shape of a truncated cone whose small base is equipped with the opening 5 of the cavity 3 through which the flow of fluid is expelled from said nozzle. The large open base of the truncated cone, corresponding to the enlarged section 2A of said envelope, is for its part intended to be closed by a static socket 6 through which the fluid is introduced into the cavity. This sleeve 6 is generally in the form of a threaded body inserted by screwing inside the casing 2 of the nozzle which is, on the fluid inlet side, threaded. A lock nut may also be provided to ensure a permanent hold in position of the sleeve 6 inside the casing 2 of the nozzle 1. In the space left free between the opening 5 of the cavity 3 and the 6A end of the sleeve 6 projecting inside the cavity 3 of the casing 2, there is provided an injector 4. This injector 4 is in the form of a body provided with an axial duct passing through which the fluid circulates before being expelled out of said cavity through the opening 5 of the cavity 3. This injector has an end 4A driven in circular displacement inside the enlarged section 2A of the casing 2 under the effect of a tangential flow water pressure acting on said injector 4. The other end 4B of this injector 4 may be provided with a nozzle which, again, has the shape of a tubular body provided with an axial duct passing through. The end of this injector can be bulged to define a convex nozzle head. This end of the injector provided with a convex head nozzle is housed in the opening of the shaped cavity in the form of a concave seat allowing the precession movements of the injector. When the end 4B of this injector 4 has a rounded convex portion conferring on the head of said injector a general shape of a half circle, the movements of the injector inside the seat, generally hemispherical, are facilitated.

The sleeve 6, which closes the end of the nozzle 1 fluid inlet side, is in turn in the form of a generally cylindrical body whose end 6A injector side is closed by a transverse wall 7. The socket body 6 thus has, in the vicinity of said transverse wall, radial orifices 8 oriented to generate, inside the cavity 3 of the casing 2, a swirling fluid flow transmitting its movement to the injector 4. The sleeve 6 here having a stepped profile is equipped with a thread intended to cooperate with the tapping of the casing 2 of the nozzle when the sleeve 6 is placed inside the casing. envelope of the nozzle. The radial orifices 8 of the bushing 6 are circumferentially distributed around the periphery of said bushing at the end 6A positioned on the injector side of the bushing 6. These radial orifices 8 of the bushing 6 are regulated in flow through a bushing. shutter 9 controlled. This flow rate adjustment makes it possible to vary the pressure prevailing inside the cavity housing the injector and consequently to establish a balance between the pressure prevailing inside the cavity 3 of the nozzle and the recoil force. of said nozzle.

The shutter 9, which makes it possible to more or less close the radial orifices 8 of the socket 6, can be controlled manually or automatically during operation. This shutter 9 can affect a large number of shapes. In a first embodiment according to FIGS. 1 and 2, the shutter 9 has the shape of an axially displaceable conduit 10 passing through the static bushing 6 in such a way that one of the ends 10A the shutter 9 comes to partially close on demand the radial holes 8 of the sleeve 6 while its other end 10B is connectable to a fluid inlet. It is therefore sufficient, to adjust the flow rate inside the cavity 3 of the nozzle, to screw or respectively unscrew the conduit 10 through constituting the shutter 9 to close more or less the radial orifices 8 of the sleeve 6 by intermediate the end 10A of the shutter. This shutter is thus in the form of again a body of generally cylindrical shape equipped with a plurality of shoulders and a thread 11 at its periphery to be screwed inside the sleeve and occupy a coaxial position to said socket. This shutter is introduced into the sleeve 6 by the end of the sleeve opposite that closed by a transverse wall 7. Socket and shutter thus form two bodies coaxial with the longitudinal axis of the base envelope.

The fluid from a fluid supply circuit of the nozzle enters E1 inside the nozzle and follows the circuit represented by the arrows in Figure 1 before exiting and producing a rotating jet shown at S1 in FIG. 1. This fluid thus passes through the duct 10 constituting the shutter 9 before passing through the radial orifices 8 of the bushing 6 to reach the cavity 3 of the nozzle where it penetrates inside the axial duct passing through the injector 4 before being expelled from the cavity through the opening 5 of the cavity 3, the expulsion making it possible to produce a rotating jet at the outlet of the nozzle resulting from the precession of the injector 4 to increase the cleaning efficiency of the support surface to be treated. The realization of the sleeve 6 in the form of a static part relative to the nozzle shell 2 allows the fluid flow from the socket to hit the casing 2 in a constant predetermined area whose shape can be adapted. Thus, in the example shown in FIG. 1, the casing 2 has an inverted conicity at its widened section 2 A so as to form a zone suitable for receiving the jet of fluid impinging on said zone. This zone thus forms a narrowing or strangling of the enlarged section 2A of the envelope.

In another embodiment of the invention shown in FIGS. 3 and 4, the shutter 9 has the shape of a duct 12 housed inside the bushing 6, this duct 12 being closed at one end by a wall 13 transverse and connectable at its other end to a fluid inlet. The duct 12 has, in the vicinity of its transverse wall 13, radial orifices 14 connected to each other by solid portions. The radial orifices 14 or the solid portions 15 are positionable opposite the radial orifices 8 of the bushing 6 during a rotary drive of the duct 12 to adjustably close off said radial orifices 8 of the bushing 6 as a function of the desired flow rate. . The shutter is thus obtained here no longer by axial and rotary displacement of a shutter but only by rotary displacement of the body of the shutter. This shutter is therefore in the form of a conduit provided again, on its periphery, a plurality of stepped shoulders. This duct 12 is held axially fixed but free to rotate inside the bushing body 6 so as to be rotated and cause, during its rotation, a more or less significant closure of the radial openings 8 of the bushing 6. Again, this adjustable shutter allows to do vary the pressure prevailing inside the cavity 3 of the casing 2 of the nozzle. The path of the nozzle supply fluid within said nozzle is similar to that described in FIG.

In another embodiment of the invention according to that shown in Figures 5 and 6, the shutter 9 has the shape of a ring 16 capping the end provided with radial holes 8 of the sleeve 6. This ring 16 is provided with radial orifices 17 which can be brought into total or partial correspondence with the radial orifices 8 of the bushing 6 during an angular displacement of the ring 16 as a function of the desired flow rate. Again, the flow control is effected by a displacement in rotation of the shutter 9. In the example shown, the ring 16 is closed at one of its ends by a transverse wall doubling the transverse wall 7 of the 6. This transverse wall is however in no way obligatory. The ring is held axially fixed outside the end of the sleeve 6 by appropriate means. This ring also comprises immobilizing means in a predetermined angular position once the setting of the matching between the radial orifices 8 of the sleeve 6 and the radial orifices 17 of the ring 16 operated. These radial orifices 17 of the ring 16 are separated or connected by solid parts in a similar manner to the shutter of FIG.

In this embodiment, the flow of fluid entering at first inside the bushing body is expelled from the bushing body through the radial openings 8 of the bushing before penetrating inside the holes 17 of the bushing. 16 ring constituting the shutter. The flow then enters the cavity 3 of the nozzle shell 2 in the form of a swirling flow and then enters the axial duct passing through the injector 4 before being expelled from the cavity through the opening 5 of said cavity corresponding to the discharge opening of the fluid flow. Independently of the embodiment chosen each time, by adjusting the dimensions of the radial orifices 8 of the sleeve 6, the pressure prevailing inside the chamber 3 of the nozzle is varied and consequently the speed of movement of the injector 4.

Claims

1. nozzle (1) rotating jet, of the type formed of a casing (2) static delimiting an open cavity (3) housing an injector (4), one end (4A) of injector is driven in circular displacement interior of an enlarged section (2A) of the envelope (2) under the effect of a tangential flow fluid pressure acting on said injector (4) while the other end (4B) of this injector ( 4) is housed in the opening (5) of the cavity (3) shaped as a concave seat allowing the precession movements of the injector (4), characterized in that the nozzle (1) has, side fluid inlet, a sleeve (6) static closed at its end (6A) injector side by a wall (7) transverse, the sleeve body (6) having, in the vicinity of said wall (7) transverse, orifices (8). ) radial oriented to generate, within the cavity (3) of the casing (2), a vortex fluid flow transmitting its m opening to the injector (4), said radial openings (8) of the sleeve (6) being regulated in flow through a shutter (9) controlled.

2. Nozzle (1) with a rotating jet according to claim 1, characterized in that the shutter (9) has the shape of a duct (10) passing through, axially displaceable by screwing inside the bushing (6). static, such that one (10A) of the ends of the shutter (9) partially obturates on demand the radial openings (8) of the sleeve (6) while its other end (10B) is connectable to a fluid arrival.

3. Nozzle (1) with rotating jet according to claim 1, characterized in that the shutter (9) is a rotating part provided with radial orifices (14, 17) interconnected by solid parts, the orifices (14) and , 17) or the solid portions being positionable opposite the radial openings (8) of the sleeve (6) during a rotational drive of the shutter (9) to adjustably close the radial openings (8) of the bushing (6) according to the desired flow rate.

4. Nozzle (1) with rotating jet according to claim 3, characterized in that the shutter (9) has the shape of a duct (12) housed inside the sleeve (6), this duct (12) ) being closed at one end by a transverse wall (13) and connectable at its other end to a fluid inlet, the radial orifices (14) interconnected by solid portions (15) being arranged in the vicinity of the wall (13); ) transverse of the duct (12), these orifices (14) radial or, respectively, these parts (15) full of the shutter

(9), being positionable opposite the radial openings (8) of the sleeve (6) during a rotary drive of the duct (12) to adjustably close said radial orifices (8) of the sleeve (6) in function of the desired flow.

5. nozzle (1) rotating jet according to claim 3, characterized in that the shutter (9) has the shape of a ring (16) capping the end provided with orifices (8) radial sleeve ( 6), this ring

(16) being provided with radial orifices (17) connected by solid parts, the radial openings or respectively the solid parts being able to be brought into total or partial correspondence with the radial orifices (8) of the sleeve (6) during a angular displacement of the ring (16) according to the desired flow.

Rotary jet nozzle (1) according to one of claims 1 to 5, characterized in that the sleeve (6) is in the form of a threaded body inserted by screwing into the nozzle of which the casing (2) is, on the fluid inlet side, threaded.