Water nozzle

Abstract

A water nozzle with a flow head is provided with at least two separate water supply devices that supply, in a controllable fashion, different water volume flows to the flow head. The flow head generates an annular jet from the different water volume flows. By controlling the water volume flows, alternatively a slim annular jet or a widened annular jet is generated by the flow head. A deflection element with a central outlet opening is provided, wherein the central outlet opening is arranged in a flow direction of the annular jet downstream of and spaced apart from the flow head. A deflection device surrounds the central outlet opening. A diameter of the central outlet opening is designed such that the slim annular jet is able to pass through the central outlet opening while the widened annular jet impacts on the deflection device surrounding the central outlet opening.

Claims

1. A water nozzle comprising: a flow head; at least two separate water supply devices configured to supply, in a controllable fashion, different water volume flows to the flow head, wherein the flow head is configured to generate an annular jet from the different water volume flows and wherein, by controlling the water volume flows, alternatively a slim annular jet or an at least somewhat widened annular jet is generated by the flow head; a deflection element comprising a central outlet opening, wherein the central outlet opening is arranged in a flow direction of the annular jet downstream of the flow head and is spaced apart from the flow head; a deflection device surrounding the central outlet opening; wherein a diameter of the central outlet opening is designed such that the slim annular jet is able to pass through the central outlet opening while the widened annular jet impacts on the deflection device surrounding the central outlet opening.

2. The water nozzle according to claim 1, further comprising a guide pipe extending from the flow head to the central outlet opening, wherein the annular jet passes through the guide pipe.

3. The water nozzle according to claim 1, wherein the deflection element comprises a hood surrounding at a spacing the flow head.

4. The water nozzle according to claim 3, wherein the hood extends in a direction opposite to the flow direction past the flow head toward the at least two water supply devices and partially surrounds the at least two water supply devices.

5. The water nozzle according to claim 4, further comprising a holder configured to mount the water nozzle such that the central outlet opening projects from a surface of a surrounding medium that covers the holder, wherein the rearward open end of the hood remote from the central outlet opening is extending to a point below the surface of the surrounding medium.

6. The water nozzle according to claim 5, wherein the flow head projects from the surface of the surrounding medium that covers the holder.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) Further advantages and details result from the dependent claims and an embodiment illustrated in the drawings which will be explained in the following.

(2) FIG. 1 shows a water nozzle according to the invention in use as it generates a parabolic water jet.

(3) FIG. 2 shows a longitudinal section of the water nozzle of FIG. 1 without water volume flows being illustrated.

(4) FIG. 3 shows a section in the direction III-III through the water nozzle of FIG. 2 without support but with illustrated water volume flows.

(5) FIG. 4 shows the water nozzle of FIG. 3 with widened deflected water jet.

DESCRIPTION OF PREFERRED EMBODIMENTS

(6) In the illustrated situation of use, the water nozzle illustrated in FIG. 1 is arranged by means of a holder 1 in a surrounding medium, here a water reservoir, in such a way that an outlet opening 3 of the water nozzle is projecting from the surface 4 of the water reservoir 2. The water nozzle generates in FIG. 1 a slim jet 5 with a great parabolic throw.

(7) FIG. 2 shows the nozzle of FIG. 1 in section view but without water reservoir 2 and without water volume flows. The function of the water nozzle will be explained in connection with FIG. 3 and FIG. 4.

(8) In the schematic illustrations of the functional principle of FIG. 3 and FIG. 4, the nozzle has a first connector 11 for a first pump, not illustrated. This pump pumps a water volume flow V1 into an annular water supply device 6 which is formed by an intermediate space between an inner pipe 7 and an outer pipe 8 of the nozzle. At the same time, a second pump, also not illustrated, pumps a water volume flow V2 through a second connector 12 into the second water supply device which is formed by the inner pipe 7.

(9) At the leading end of the inner pipe 7 and of the outer pipe 8, a flow head 13 is provided which is substantially formed of an outer flow guiding device 14 and an inner flow guiding device 15. Both flow guiding devices 14, 15 are preferably adjustable and combine the water volume flows V1 and V2 at the exit of the flow head 13 to a sharply delimited annular jet 5. The adjustability of the flow guiding devices 14, 15 serves in this context for adjusting the annular jet 5. The annular jet 5 passes without contact through the guide pipe 17 to a deflection element 18 which is designed as a hood in the illustrated embodiment. The deflection element 18 comprises the central outlet opening 3, which is arranged in flow direction S downstream of the flow head 13 and is spaced apart from the flow head 13. Through the central outlet opening 3 the annular jet 5 can pass unhindered in FIG. 3.

(10) FIG. 4 shows an alternative operating state of the water nozzle. The volume flow V2 was increased relative to volume flow V1 or the volume flow V1 was reduced relative to volume flow V2. Therefore, a funnel-shaped widened annular jet 5 is formed at the flow head 13. The annular jet 5 of water cannot pass the outlet opening 3 because of its widened shape. The widened annular jet 5 is instead deflected by means of a deflection device which is part of the deflection element 18 or, in this case, the hood. Thus, the annular jet 5 of water impacts on the impact and guiding walls 22 of a central body 21 of the deflection device and from there flows back in the direction of arrows R, possibly with further deflection by means of the closed end face 28 and the sidewalls 38 of the hood 18.

(11) In the preferred embodiment, the hood 18 extends in a direction opposite to the flow direction S past the flow head 13. FIG. 1 shows that in this way in particular a return of the water return flow R to a location below the surface 4 of the surrounding medium (water reservoir 2) is realized.

(12) By modulation of the volume flows V1 and V2 between the operating states of FIG. 3 and FIG. 4, the widened annular jet 5 shown in FIG. 4 can be generated by increase of the volume flow V2 or by reduction of the volume flow V1 relative to the volume flows of FIG. 3. This widened annular jet 5 cannot exit from the central outlet opening 3; therefore, the annular jet 5 appears to be cut off to the onlooker.

(13) The water nozzle according to the invention can be operated at high water pressures so that great display heights and display throws of the water jet 5 can be produced. Also, by variation of the volume flows V1 and V2, additional effects are possible, for example, a variation of the display throw or generation of a slightly wavy jet. For this purpose, in particular pumps are suitable whose rotary speed can be electronically controlled.

(14) The specification incorporates by reference the entire disclosure of German priority document 10 2015 121 232.3 having a filing date of Dec. 7, 2015.

(15) While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.