Abstract:
In a washing nozzle for use on vehicles for applying a liquid cleaning or washing medium, means are provided for acting within the nozzle on a main jet generated in the nozzle with a collision jet in order thus to modify the nozzle jet which emerges.

Description:
BACKGROUND OF THE INVENTION 
   The invention relates to a washing nozzle and, more particularly, to a washing nozzle for use in washing or cleaning systems on vehicles for cleaning vehicle windows, in particular front windows or windscreens, headlamps, rear lights and/or cameras. 
   Within the context of the invention, a washing nozzle is therefore in particular a nozzle for applying the liquid cleaning or washing medium to an area of the vehicle which is to be cleaned, that is to say for example to vehicle windows, in particular front windows or windscreens, headlamps, rear lights and/or cameras. Within the context of the invention, the liquid cleaning or washing medium is in particular water, preferably with active washing additives and/or frost protection agents. 
   Within the context of the invention, a punctiform nozzle jet is a nozzle jet having a cross section which remains constant or essentially constant, that is to say a nozzle jet which does not diverge or diverges only slightly. Within the context of the invention, a flat or fan-shaped nozzle jet is in particular a nozzle jet which has a rectangular cross section at least when it strikes the surface to be cleaned and which, starting from the washing nozzle or nozzle opening, increasingly widens in an axis which runs perpendicular to the jet axis. 
   Washing nozzles for use on vehicles, in particular road vehicles, for applying a liquid cleaning or washing medium are known in various designs. For example, windscreen washing nozzles are known (WO 00/12361) which consist of a nozzle body with a line for supplying the cleaning or washing medium and with a plate-shaped nozzle chip or insert arranged in a recess of the nozzle body, said insert being accommodated in a form-fitting manner in the recess of the nozzle body and being provided on one side of its surface with a number of channel grooves which, when the insert is mounted in the nozzle body, form nozzle channels which are connected to the supply channel and which each form a nozzle opening, namely for generating a number of diverging jets of the liquid cleaning or washing medium. 
   Also known are windscreen washing nozzles (DE 44 22 590 A1) for generating a fan-shaped or flat nozzle jet, comprising a nozzle body in which a supply channel for the liquid cleaning or washing medium is formed, which merges via a narrowing into a nozzle channel or expansion chamber which expands in terms of its width in the flow direction and ends in an essentially slot-shaped nozzle opening. 
   It is also known (DE 1 205 404) to deflect an essentially punctiform nozzle jet emerging from a single nozzle opening by means of a deflection plate provided outside the washing nozzle and thus to deform said jet such that the cleaning medium is distributed as widely as possible over the surface to be cleaned, that is to say the windscreen. 
   Known nozzles in principle have the disadvantage that the jet form and/or jet type, in particular including the droplet size and the speed thereof in the emerging nozzle jet, are not sufficient for an optimal cleaning or wiping effect, and/or the volume stream and thus the consumption of liquid cleaning medium is too great in comparison to the effect achieved. 
   SUMMARY OF THE INVENTION 
   It is an object of the invention to provide a novel washing nozzle which is improved in terms of its function. In order to achieve this object, a washing nozzle is designed for use on vehicles for applying a liquid cleaning or washing medium, comprising at least one nozzle channel in a nozzle body, comprising at least one nozzle opening formed by the nozzle channel for the exit of at least one nozzle jet, comprising at least one supply line which opens into the nozzle channel for supplying the cleaning medium, and comprising at least one section in the nozzle channel for generating at least one primary or main jet from the cleaning medium. characterized by means for acting on the at least one main jet with a collision jet within the nozzle body in a collision and/or mixing chamber provided upstream of the nozzle opening in the flow direction. 
   It is an object of the invention to provide a novel washing nozzle which is improved in terms of its function. In order to achieve this object, a washing nozzle is designed according to claim  1 . 
   In the washing nozzle according to the invention, which can be implemented in a large number of variants, within the washing nozzle, at a narrowing of the nozzle channel or else at a least one exit opening of an inner nozzle channel section, a nozzle jet is generated which is then acted upon by a collision jet within the washing nozzle or in a collision and/or mixing chamber formed therein, for example by a section of the nozzle channel, the flow direction of said collision jet being oriented perpendicular or transversely to the axis direction of the main jet as it acts on the latter. 
   In one embodiment, the washing nozzle has at least two supply lines for the liquid cleaning medium, namely one supply line for generating the main jet and one supply line for generating the collision jet. In this embodiment, it is then possible to operate the washing nozzle in at least two different operating modes, namely in a first mode in which the washing nozzle generates at least one punctiform jet and in a second mode in which, using the collision jet, the main jet is modified, that is to say in particular by the collision jet being “atomized”, in such a way that a diverging jet is produced, i.e. a fan-shaped nozzle jet given a suitable design of the washing nozzle, the nozzle channel and the nozzle opening. 
   In a further possible embodiment, within the washing nozzle, there is generated from the liquid cleaning medium fed in via a line a main stream for forming a main jet and an auxiliary or collision stream for forming the collision jet, wherein, once again within the washing nozzle or within the collision and/or mixing chamber, the main jet which is already present there is then acted upon by the collision jet and modified by the latter. 
   Further developments of the invention form the subject matter of the dependent claims. The invention will be explained in more detail below with reference to the figures and on the basis of examples of embodiments. In the figures: 

   
     DESCRIPTION OF THE DRAWINGS 
       FIG. 1  shows in a simplified diagram and in section a washing nozzle (multifunction nozzle) according to the invention; 
       FIG. 2  shows in a simplified diagram and in section a nozzle insert or chip for use in the washing nozzle of  FIG. 1 ; 
       FIGS. 3 and 4  show the nozzle chip in front view and in plan view; 
       FIGS. 5 and 6  in each case show in a simplified diagram a plan view of the washing nozzle of  FIG. 1  in two different operating modes; 
       FIG. 7  shows in a simplified part-diagram and in section a further possible embodiment of the washing nozzle according to the invention; 
       FIG. 8  shows in a schematic diagram the design of the liquid or nozzle channel of the washing nozzle of  FIG. 7 ; 
       FIGS. 9 and 10  show a perspective diagram and a plan view of the lower part of the two-part washing nozzle of  FIG. 7 , with the nozzle upper part removed; 
       FIGS. 11 and 12  show in a perspective diagram and in a view from below the nozzle upper part of the washing nozzle of  FIG. 7  in a view which has been turned with respect to the installation state; 
       FIGS. 13 and 14  show diagrams similar to  FIGS. 7 and 8  in the case of a further possible embodiment; 
       FIG. 15  shows a simplified perspective diagram of the washing nozzle of  FIGS. 13 and 14 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   For the purpose of simpler explanation, in each case the three spatial axes which are oriented perpendicular to one another, namely the X-axis, the Y-axis and the Z-axis, are shown in the figures, wherein the X-axis coincides with the nozzle axis DA. 
   The nozzle which bears the general reference  1  in  FIGS. 1 to 6  serves as a washing and cleaning nozzle for cleaning windscreens, headlamps, rear lights, cameras, etc. and consists in a manner known per se of a nozzle body  2 , which is made of a suitable material and in a suitable technology, for example as an injection-moulded part made of plastic, and of a nozzle chip or insert  3 , which is likewise made of a suitable material, e.g. plastic, possibly even of a flexible plastic. 
   In the illustrated embodiment, the nozzle body  2  is cube-shaped and has an upper side  2 . 1 , a front side  2 . 2 , a rear side  2 . 3  and two longitudinal sides  2 . 4 . Of course, other shapes are also conceivable for the nozzle body  2 . 
   Provided in the nozzle body  2 , which is shown as one piece in  FIGS. 1-6 , but may also be designed as more than one piece, is a recess  4  which in the illustrated embodiment is composed of two sections which adjoin one another in the direction of the nozzle axis DA or X-axis, namely of the innermost section  4 . 1  and the section  4 . 2 . In the illustrated embodiment, the section  4 . 1  has a constant, rectangular cross section in cross-sectional planes parallel to the YZ plane, namely with the smaller cross-sectional dimension in the Y-axis. At the front side  1 . 1  of the nozzle  1  or at the front side  2 . 2  of the nozzle body  2 , the section  4 . 2  forms the slot-shaped nozzle opening  5  which lies with its longitudinal extent in the direction of the Z-axis, and in the illustrated embodiment has a constant cross-sectional dimension in the Y-axis which is nevertheless somewhat greater than the cross-sectional dimension of the section  4 . 1  in this Y-axis. The width of the section  4 . 2  in the Z-axis increases in a funnel-like manner as the distance from the section  4 . 1  increases. 
   At the transition to the section  4 . 1 , the section  4 . 2  has in the direction of the Z-axis a width which in the illustrated embodiment is equal to the corresponding width of the section  4 . 1 . The lower boundary surfaces of the sections  4 . 1  and  4 . 2  which lie in the XZ plane and further away from the upper side  2 . 1  are arranged in a common plane. By virtue of the greater height which the section  4 . 2  has in the Y-axis, a step is formed at the transition  4 . 3  between the sections  4 . 1  and  4 . 2 . 
   In the illustrated embodiment, the nozzle insert  3  is plate-shaped, namely such that it is received in a form-fitting manner by the section  4 . 1 . In the illustrated embodiment, the nozzle insert  3  can be mounted by pushing it in through the nozzle opening  5 . The nozzle insert  3  has an opening or recess  6  which in the illustrated embodiment is rectangular, extends from the upper side  3 . 1  to the lower side  3 . 2  of the nozzle insert  3  and is opened into by in each case one end of the three channel grooves  7  formed in the upper side  3 . 1 . The channel grooves  7  end with their other ends in each case at a peripheral side  3 . 3  of the nozzle insert  3  designed as a rectangular plate, namely the central channel groove  7  ends in the center (center plane M′) of this side  3 . 3  and the two other, outer channel grooves  7  in each case end in a bevelled corner region  3 . 3 . 1  at the transition from the side  3 . 3  to an adjacent longitudinal side  3 . 4 . 
   The channel grooves  7  are arranged such that the central channel groove  7  lies with its longitudinal extent or axis parallel to the two sides  3 . 4  and the two outer channel grooves  7  or their axes have an increasing distance from the central channel groove  7  as the distance from the opening  6  increases. The angle α, which the axis of an outer channel groove  7  in each case encloses with the longitudinal axis of the central channel groove  7 , is equal to the angle β which the bevelled regions  3 . 3 . 1  form with the plane of the side  3 . 3 . In the illustrated embodiment, the nozzle insert  3  is furthermore symmetrical with respect to the center plane M′ which includes the axis of the central channel groove  7  and runs perpendicular to the upper side  3 . 1  and lower side  3 . 2 . 
   In the assembled state, the insert  3  bears with its lower side  3 . 2  against the lower side of the section  4 . 1  remote from the upper side  2 . 1  of the nozzle body  2 , and bears with its upper side  3 . 1  against the upper side of this section. The opening  6  thus forms a chamber  6   a  into which a first supply channel  9 . 1  for the liquid cleaning medium (e.g. washing water) opens, said supply channel being formed in the nozzle body  2 . The channel grooves  7  form internal nozzle channel sections  7   a  which open into the section  4 . 2  of the washing nozzle  1  in a manner diverging from the chamber  6   a . The axes of the diverging channel sections  7   a  are arranged in a common XZ plane and the axis of the central channel section  7   a  lies in the X-axis or in the nozzle axis DA. The cross sections of the channel sections  7   a  are smaller than the cross section of the section  4 . 2  at the transition  4 . 3 . 
   Formed in the nozzle body  2  is a second supply channel  9 . 2  which likewise lies with its longitudinal extent in the Y-axis and opens into the section  4 . 2  which forms the nozzle channel section which expands in terms of its width towards the slot-shaped nozzle opening  5 . The mouth or opening  9 . 2 . 1  of the supply channel  9 . 2 , like the mouth or opening  9 . 1 . 1  of the supply channel  9 . 1 , is located at the lower side of the recess  4  in the XZ plane remote from the nozzle body upper side  2 . 1 , and specifically the mouth of the supply channel  9 . 2  is located at the transition  4 . 3  such that this mouth is still slightly covered by the front side  3 . 3  of the insert  3 . 
   In the illustrated embodiment, the sections  4 . 1  and  4 . 2  and also the channel sections  7   a  are designed and arranged to be symmetrical with respect to an imaginary center plane M, which center plane includes the X-axis and also the axes of the supply channels  9 . 1  and  9 . 2  and is oriented perpendicular to the XZ plane. 
   As shown in  FIGS. 5 and 6 , two different operating modes are possible with the washing nozzle  1 , namely a first operating mode in which the liquid cleaning medium is fed in only via the supply channel  9 . 1  (arrow A), and specifically with a predefined pressure so that three full jets  10  of the liquid cleaning medium are generated by the internal nozzle channel sections  7   a , said jets emerging through the section  4 . 2  at the nozzle opening  5  ( FIG. 1 ). The liquid cleaning medium is in this case fed to the washing nozzle  1  or to the supply channel  9 . 1  at a given pressure, for example greater than 1.5 bar. 
   The second operating mode is shown in  FIG. 6 . In this operating mode, the liquid cleaning medium is fed in both via the supply channel  9 . 1  (arrow A) and via the supply channel  9 . 2  (arrow B). In this case, three primary or main jets are once again firstly generated at the openings of the nozzle channel sections  7   a  from the cleaning medium fed in via the supply channel  9 . 1 . However, these primary or main jets are then atomized by virtue of the cleaning medium (collision jet) emerging perpendicular to the respective jet direction via the supply channel  9 . 2  or the opening  9 . 2 . 1  thereof into the section  4 . 2 , so that a fan-shaped jet  11  emerges from the nozzle opening  5  onto the surface to be cleaned. The section  4 . 2  in this case acts as a collision and/or mixing chamber. The upper side which delimits the section  4 . 2  at the top and the lower side which delimits said section at the bottom serve as guide lips which shape and stabilize the emerging fan-shaped jet  11 . In the operating mode of  FIG. 6 , the liquid cleaning medium is fed to the washing nozzle  1  or to the supply channels  9 . 1  and  9 . 2  at a reduced pressure compared to the operating mode of  FIG. 5 , for example at a pressure of less than 1.5 bar. 
   The punctiform jets  10  or the operating mode of  FIG. 5  are/is suitable for example for cleaning vehicle front or rear windows and/or headlamps and/or cameras at a high travelling speed of a vehicle. The fan-shaped jet  11  is suitable in particular for cleaning at a low travelling speed. 
   The changeover between the two operating modes takes place for example by a valve arrangement  12  which is shown in a highly schematic manner in  FIG. 1  and which is provided and pressure-controlled jointly for a number of nozzles  1  for example. If necessary, additional guide lips for stabilizing in particular the jet  11  may be provided at the nozzle exit opening. 
   The advantages of the washing nozzle  1  compared to known nozzles consist inter alia in the possibility of changing over between the two operating modes (punctiform jets or full jets  10  and fan-shaped jet  11 ), in the optimal adaptation to different travelling speeds, in the optimal distribution of the cleaning liquid over the surface to be cleaned in each case, which is likewise adapted to the respective travelling speed of the vehicle, and in a small design despite the possibility of changing the operating mode and despite the washing nozzle  1  being designed as a multifunction nozzle. 
     FIGS. 7 and 8  show in a somewhat schematic diagram, as a further possible embodiment of the invention, a washing nozzle  13  which in terms of its function corresponds to the washing nozzle  1  in that a second jet (collision jet) is introduced into a main jet of the liquid cleaning medium, perpendicular to the direction of this jet, i.e. perpendicular to the nozzle axis DA, in order to form an optimal, flat and fan-shaped nozzle jet  14 , so that in this case the main jet is broken up or atomized, and specifically in this embodiment with the result of an increase in the droplet size in the nozzle jet  14 . 
   In the illustrated embodiment, the washing nozzle  13  has a nozzle body  15  which is formed in two parts, consisting of the nozzle body lower part  16  and the nozzle body upper part  17  with an integrally formed nozzle insert  18 . At the transition between the lower part  16  and the upper part  17  or the insert  18  (plane E), a nozzle channel  19  is formed in the nozzle body  15 , which nozzle channel ends at a front side  13 . 1  of the nozzle  13  in a slot-shaped nozzle opening  20  for the exit of the nozzle jet  14 . 
   The nozzle channel  19  lies with its longitudinal extent once again in the X-axis, which is also the nozzle axis DA. The nozzle opening  20  lies with its longitudinal extent in the Z-axis, wherein the plane of the nozzle opening  20  is once again the YZ plane. At the end remote from the nozzle opening  20 , a supply channel  21  for the liquid cleaning medium opens into the nozzle channel  19 , namely via the mouth  21 . 1 . The supply channel  21  is oriented with its axis in the Y-axis at least in the region of this mouth. 
   As can be seen very clearly in particular from  FIGS. 7 and 8 , the nozzle channel  19  is composed of two nozzle channel sections  19 . 1  and  19 . 2  which are formed by trough-like depressions or recesses which are integrally formed in the lower part  16  and in the upper part  17  or in the insert  18 , namely on surfaces which adjoin one another in the plane E perpendicular to the Y-axis, so that the trough-like recesses or the channel sections  19 . 1  and  19 . 2  formed thereby supplement the nozzle channel  19 . 
     FIG. 15  shows a simplified perspective diagram of the washing nozzle of  FIGS. 13 and 14 . 
   In the illustrated embodiment, the nozzle channel section  19 . 1  consists of three part-sections which adjoin one another in the direction of the nozzle axis DA or X-axis, namely of the elongate part section  19 . 1 . 1  starting from the opening  21 . 1  with a constant width in the direction of the Z-axis and a constant height in the direction of the Y-axis, the section  19 . 1 . 2  which adjoins the part-section  19 . 1 . 1  in the direction towards the nozzle opening  20 , the width of which section  19 . 1 . 2  is reduced and then increased again in the direction of the Z-axis with the height (Y-axis) remaining constant, and the section  19 . 1 . 3  which ultimately forms the nozzle opening  20 , the width of which section  19 . 1 . 3  increases in a funnel-shaped or cone-shaped manner up to the width of the nozzle opening  20  in the direction of the Z-axis with the height (Y-axis) remaining constant. 
   The nozzle channel section  19 . 2  or the trough-like recess in the lower part  16  which forms this section opens with one end into the supply channel  21  or into the opening  21 . 1  and extends in the direction of the X-axis below the part-section  19 . 1 . 2  in such a way that the end  22  of the nozzle channel section  19 . 2  or of the recess which forms this section  19 . 2  which is remote from the supply channel  21  lies in the region of the part-section  19 . 1 . 3 , but at a distance from the nozzle opening  20  which is greater than the distance from the part-section  19 . 1 . 2 . 
   If the liquid cleaning medium is fed to the washing nozzle  13  at the supply channel  21  with a predefined volume and with a predefined pressure, essentially two initially parallel streams are produced within the nozzle channel  19 , namely once again the main stream A in the nozzle channel section  19 . 1 , from which a fan-shaped primary flat jet is generated in the region of the narrowing formed by the part-section  19 . 1 . 2  and the adjoining part-section  19 . 1 . 3  which acts as an expansion chamber, and in the channel section  19 . 2  the collision stream B which in this channel section  19 . 2  initially flows parallel to the main stream A then strikes the deflection surface formed by the end  22  and, deflected at the latter essentially in the direction of the Y-axis and thus transversely to the flow direction of the main stream, strikes said main stream and as a result modifies or breaks up the main stream A in the part-section  19 . 1 . 3  in order to improve the properties of the nozzle jet  14  which emerges. The part-section  19 . 1 . 3  once again serves as a collision and/or mixing chamber. The part-length of the nozzle channel  19  or of the part-section  19 . 1 . 3  which follows the end  22  in the flow direction also acts as a calming path and serves to stabilize and align the nozzle jet  14 . 
   In the illustrated embodiment, the nozzle channel  19  or the channel sections  19 . 1  and  19 . 2  which form this channel are designed to be symmetrical with respect to an imaginary center plane M, which center plane includes the X-axis and also the axis of the supply channel  21  and is oriented perpendicular to the plane E. 
   As shown in  FIG. 7  at  23  and  24 , the nozzle body  15  or the lower part  16  and upper part  17  are continued beyond the actual nozzle opening  20  on the nozzle front side  13 . 1 , namely in such a way that the nozzle opening  20  is located within a recess  25  which is open on the nozzle front side  13 . 1  and which has a height in the direction of the Y-axis which is considerably greater than the height of the nozzle opening  20 , the width of which recess in the direction of the X-axis at the nozzle opening  20  is at least equal to the width of this nozzle opening and widens outwards at the same angle as the nozzle opening. 
     FIGS. 9-12  show the design of the lower part  16  and of the upper part  17  in greater detail. Both parts are designed in the shape of blocks or chunks, and namely the lower part  16  on its upper side  16 . 1  which lies in the XZ plane comprises a recess  26  which is open towards this upper side and towards the front side  16 . 2  lying in the YZ plane, which recess in the illustrated embodiment has a constant depth in the direction of the Y-axis and is formed by two sections which adjoin one another in the direction of the X-axis, and namely by the section  26 . 1  with an essentially constant width and by the adjoining section  26 . 2 , the width of which increases in the direction of the Z-axis as the distance from the section  26 . 1  increases and ultimately forms the recess  25  of the washing nozzle  13 . 
   The supply channel  21  opens onto the base of the section  26 . 1 , which defines the plane E. Furthermore, the nozzle channel section  19 . 2  or the trough-like recess which forms this channel section is made in the base of the section  26 . 1 . 
   The upper part  17  consists of a cube-shaped basic body  27  and of the insert  18  which is likewise cube-shaped and is integrally formed on the lower side  27 . 1  of the basic body. The dimensions of the insert  18  are selected such that, when the upper part  17  is placed with the lower side  27 . 1  on the upper side  16 . 1 , the insert  18  is received in a form-fitting manner in the section  26 . 1  of the recess  26  and the lower side  18 . 1  of the insert  18  which faces away from the basic body  27  lies in the plane E. The channel section  19 . 1  or the trough-like depression which forms this section is integrally formed in the lower side  18 . 1 . Both parts are fixed to one another by means of screws (not shown) which engage through holes  28  of the upper part  17  and of the basic body  27  into threaded holes  29  of the lower part  16 . 
   The protrusion  23  forms a surface  23 . 1  which lies in a common XZ plane, that is to say in the plane E, with the lower edge of the nozzle opening  20  which extends in the direction of the Z-axis, and as a result acts as an additional lip for stabilizing and aligning the nozzle jet  14 . 
     FIGS. 11-13  show, as a further possible embodiment, a washing nozzle  13   a  which differs from the washing nozzle  13  essentially only in that the lower part  16   a  has only one recess corresponding to the section  26 . 1 , in which the insert  18   a  which corresponds to the insert  18  is inserted, wherein the lower part  16   a  on the front side  13 . 1   a  of the washing nozzle  13  has a step-like protrusion  23   a  which projects beyond the nozzle opening  20   a  and the surface  23 . 1   a  of which that lies in the XZ plane once again serves to stabilize the emerging nozzle jet. Of course, in this embodiment, the insert  18   a  can also once again be part of an upper part which corresponds to the upper part  17  and has a basic body which corresponds to the basic body  27 . 
     FIGS. 13 and 14  are diagrams similar to  FIGS. 7 and 8  in the case of a further possible embodiment. 
   The invention has been explained above on the basis of examples of embodiments. It will be understood that numerous changes and modifications are possible without departing from the concept on which the invention is based. For example, it is possible in the washing nozzle  1  or in the nozzle insert  3  therein to provide a recess instead of the opening  6  on the upper side  3 . 1 , which recess, as shown in  FIG. 4  by the broken line  30 , is then designed as a continuous window in a part-region which is remote from the channel grooves  7 , through which window the liquid cleaning medium passes into the chamber  6   a  via the supply channel  9 . 1 , whereas otherwise the recess is designed only as a depression into which the channel grooves  7  open in each case at one end. 
   
     
       
             
             
             
           
         
             
                 
               TABLE 1 
             
             
                 
                 
             
             
                 
               Part Number 
               Part Name 
             
             
                 
                 
             
           
           
             
                 
                1 
               washing nozzle 
             
             
                 
                1.1 
               nozzle front side 
             
             
                 
                2 
               nozzle body 
             
             
                 
                2.1 
               nozzle body upper side 
             
             
                 
                2.2 
               nozzle body front side 
             
             
                 
                2.3 
               nozzle body rear side 
             
             
                 
                2.4 
               nozzle body longitudinal side 
             
             
                 
                3 
               nozzle insert 
             
             
                 
                3.1 
               upper side of nozzle insert 
             
             
                 
                3.2 
               lower side of nozzle insert 
             
             
                 
                3.3 
               front side of nozzle insert 
             
             
                 
                3.3.1 
               bevelled corner region 
             
             
                 
                3.4 
               longitudinal side of nozzle insert 
             
             
                 
                4 
               recess 
             
             
                 
                4.1, 4.2 
               section of recess 
             
             
                 
                4.3 
               transition between sections 4.1 and 4.2 
             
             
                 
                5 
               nozzle opening 
             
             
                 
                6 
               recess or opening 
             
             
                 
                6.1, 6.2 
               section of recess 
             
             
                 
                6a 
               chamber 
             
             
                 
                7 
               channel groove 
             
             
                 
                7a 
               internal nozzle channel section 
             
             
                 
                8 
               nozzle channel 
             
             
                 
                9.1, 9.2 
               supply channel 
             
             
                 
                9.1.1, 9.2.1 
               opening or mouth of supply channel 
             
             
                 
               10 
               punctiform jet 
             
             
                 
               11 
               fan-shaped jet 
             
             
                 
               12 
               control valve 
             
             
                 
               13, 13a 
               washing nozzle 
             
             
                 
               13.1, 13.1a 
               nozzle front side 
             
             
                 
               14 
               nozzle jet 
             
             
                 
               15 
               nozzle body 
             
             
                 
               16, 16a 
               nozzle body lower part 
             
             
                 
               16.1 
               upper side 
             
             
                 
               16.2 
               front side 
             
             
                 
               17 
               nozzle body upper part 
             
             
                 
               18, 18a 
               insert 
             
             
                 
               18.1 
               lower side 
             
             
                 
               19 
               nozzle channel 
             
             
                 
               19.1, 19.2 
               nozzle channel section 
             
             
                 
               19.1.1, 19.1.2, 19.1.3 
               part-section 
             
             
                 
               20, 20a 
               nozzle opening 
             
             
                 
               21 
               supply channel 
             
             
                 
               21.1 
               mouth of supply channel 
             
             
                 
               22 
               end 
             
             
                 
               23, 23a, 24 
               protrusion 
             
             
                 
               23.1, 23.1a 
               surface 
             
             
                 
               25 
               recess 
             
             
                 
               26 
               recess 
             
             
                 
               26.1, 26.2 
               section of recess 26 
             
             
                 
               27 
               basic body of upper part 17 
             
             
                 
               27.1 
               lower side 
             
             
                 
               28 
               hole 
             
             
                 
               29 
               threaded hole 
             
             
                 
               30 
               edge line 
             
             
                 
               A 
               main stream 
             
             
                 
               B 
               collision stream 
             
             
                 
               E 
               plane 
             
             
                 
               M, M′ 
               center plane 
             
             
                 
               X, Y, Z 
               spatial axis 
             
             
                 
               α, β 
               angle 
             
             
                 
                 
             
           
        
       
     
   
   While the form of apparatus herein described constitutes a preferred embodiment of this invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.