Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/02—Spray pistols; Apparatus for discharge
  • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
  • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
  • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25C—PRODUCING, WORKING OR HANDLING ICE
  • F25C3/00—Processes or apparatus specially adapted for producing ice or snow for winter sports or similar recreational purposes, e.g. for sporting installations; Producing artificial snow
  • F25C3/04—Processes or apparatus specially adapted for producing ice or snow for winter sports or similar recreational purposes, e.g. for sporting installations; Producing artificial snow for sledging or ski trails; Producing artificial snow
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25C—PRODUCING, WORKING OR HANDLING ICE
  • F25C2303/00—Special arrangements or features for producing ice or snow for winter sports or similar recreational purposes, e.g. for sporting installations; Special arrangements or features for producing artificial snow
  • F25C2303/048—Snow making by using means for spraying water
  • F25C2303/0481—Snow making by using means for spraying water with the use of compressed air

Definitions

• the present invention relates to a generator of ice or snow particles, also called nucleation device or nucleator, integrated in a head for spraying water under pressure for the manufacture of artificial snow.
• nucleation devices are practically essential when the production of artificial snow is carried out by means of simple water spray heads, in order to carry out a sowing and a rapid production of snow, that is to say even under boundary conditions. of temperature and humidity.
• Nucleation devices are devices particularly sensitive to atmospheric conditions and in particular to freezing.
• nucleators also operate with a very low water flow rate and are generally supplied by a special circuit which regulates the flow rate and the pressure, which circuit is installed bypassing the circuit for supplying pressurized water to the different nozzles. the spray head.
• the present invention provides a nucleation device which. by its design and its association with the spray head, overcomes the drawbacks mentioned above.
• the nucleation device comprises means for injecting a small jet of water under pressure into an air stream, at high speed, with a very high air / water ratio, and the air-water mixture. takes place either internally in a mixing chamber integrated into the spray head, or externally, that is to say outside of said head, and these water injection means at least are located in said head and soak in the water circuit which continuously supplies pressure to the spray nozzle (s) and, simultaneously, said injection means.
• the air / water ratio of this nucleation device is at least equal to 200, and the injection of water into the stream of pressurized air takes place through one or more orifices of section very small, with a diameter of the order of 1 mm and less.
• This particularly small section makes it possible to achieve a significant pressure drop at the nucleator level and above all avoids any recourse to a pressure reducing system when the pressurized water comes from the supply circuit of the nozzles of the spray head.
• the pressure in this supply circuit of the nozzles can vary in significant proportions, without influencing the operation of the nucleation device.
• the nucleation device which performs an external mixing comprises an air spray nozzle which is provided with a deflector for producing a flat spectrum jet, and it comprises a nozzle or nozzle for spraying the water, the jet of which strikes the flat air flow at an angle of the order of 45 °.
• the nucleation device is in the form of a mini high-pressure snow cannon supplied with pressurized air and directly with pressurized water by means of the supply channel of the spray nozzle (s), which mini barrel is in the form of a cartridge implanted in the spray head and this cartridge extends between a channel for supplying pressurized air and the downstream external wall of said head, crossing at least one channel supplying pressurized water to one or more spray nozzles.
• the mixing chamber of the mini barrel is cylindrical in shape and its diameter is slightly greater than the diameter of the nozzle, or nozzle, at the end, which nozzle has an outlet orifice the section, which is circular or oval, has a diameter equivalent to a maximum of 10 mm.
• the orifice (s) which allow the injection of pressurized water into the mixing chamber comprise a hole opening into said chamber, the diameter of which is of the order of 1 mm and of which the length is of the same order as said diameter, which hole can be arranged in the center of a borehole or counterbore of large diameter, at least ten times the diameter of said through hole, so as to form a kind of diaphragm at the level of the entry of the water jet into said mixing chamber.
• the present invention also provides, in combination with these nucleators, a spray head whose capacities can, for example, be easily modified as required.
• the spray head with which the nucleation device is associated consists of a body which comprises at least two spray nozzles supplied separately with pressurized water, which head comprises a foot, a foot which is arranged so as to allow its attachment to a pole, which pole comprises for example several water supply conduits and possibly pressurized air, which conduits are arranged in relation to orifices arranged in said foot to supply the different nozzles of said head.
• the body of the spray head consists of a molded part of annular or other shape, made of light alloy for example, which part is provided with supply chambers for the spray nozzles of the pressurized water, which chambers are for example obtained directly by molding, each of them being supplied by means of a channel disposed at the lower part of the body so as to allow the total emptying of said chambers when the spray head is inactive , which chambers are moreover adjacent, arranged side by side, offset axially with respect to the axis of the spray jet, and they are each traversed by axial holes which make it possible to accommodate said spray nozzles in the form of cartridges, which cartridges comprise at least one orifice which opens into one of the chambers, to allow their supply of pressurized water.
• the spray head can thus include families of nozzles; each family being fed by the same room.
• the spray head comprises, upstream of the supply chambers for spraying the pressurized water nozzles, a chamber supplied with pressurized air, and the cartridge of the nucleation device passes through the various water chambers. under pressure and opens at its upstream end into said pressurized air chamber, which cartridge also comprises at least one orifice which opens into one of said pressurized water chambers, and in particular the main chamber arranged upstream from the others , to allow the injection of water into the air flow which circulates in said cartridge through the mixing chamber, and this air-water mixture is sprayed by the nucleator nozzle in the form of ice or snow.
• the spray head with incorporated nucleation device comprises at least two nozzles supplied separately by separate circuits of pressurized water, these nozzles are arranged radially on the periphery of a tubular jacket, the axis is close to vertical under normal operating conditions, which jacket contains a core which is provided with radial partitions to divide the internal space of said jacket in leaktight manner into several chambers: - a main chamber and - at least a secondary chamber which is implemented after the main chamber if necessary, which chambers serve to supply one or more nozzles, which core is provided with internal channels connected to said pressurized water circuits so as to supply each chamber.
• the upper part of the spray head comprises a cap provided with at least one nucleation device arranged next to or in the field of the nozzle (s) of the main chamber, which device is supplied with water and in pressurized air, which supply takes place, for water, via the supply channel of said main chamber, which channel passes through said cap, and the air supply takes place at by means of a specific channel arranged in the core and in the cap, in the center of the latter.
• the nucleation device is integrated radially into the head, passing through the tubular jacket and is fitted into the central core up to the pressurized air inlet channel.
• the nucleation device comprises a cartridge constituting the mixing chamber and two nozzles for spraying the air-water mixture, each nozzle being oriented parallel to the faces of the dihedrons in which, for example, the water spray nozzles are aligned. under pressure.
• the body of the nucleation device soaks in the water which circulates in the main chamber, preventing freezing and blockage of the small orifice (s) due to the permanent circulation of water in said chamber.
• the different supply channels of the chambers of said head open out at the bottom of each chamber thus allowing total emptying. of these when the installation stops.
• FIG. 1 schematically shows an embodiment of a spray head capable of being associated with a nucleation device according to the invention
• - Figure 2 shows schematically and simply functional, a section of the body of the spray head and the implantation of a cartridge acting as a spray nozzle, supplied by the upstream chamber of said body;
• FIG. 3 shows, as in Figure 2, a schematic section of the body of the spray head with a cartridge acting as a nozzle, arranged to cooperate with the central chamber;
• FIG 4 shows as before, a cartridge acting as a spray nozzle, cooperating with the downstream chamber of the body;
• - Figure 5 shows the supply of the different chambers of the body of the spray head
• - Figure 6 shows an elevation in longitudinal and vertical section of a spray head according to a first embodiment of the nucleation device according to the invention
• FIG. 7 shows a front view of the spray head shown in Figure 6;
• - Figure 8 shows a rear view of the spray head shown in Figures 6 and 7;
• - Figure 9 shows in more detail, the nucleation device installed upstream of the body of the spray head as shown in Figures 6 to 8;
• - Figure 10 shows an alternative layout of the nucleation device in the spray head, which nucleation device is in the form of a mini snow gun of the high pressure type;
• FIG. 11 shows an alternative embodiment of the spray head according to the invention with a vertical and axial section of the nucleation device
• - Figure 12 shows in detail and enlarged, an orifice for introducing pressurized water into the mixing chamber of the nucleation device
• FIG. 17 shows a variant of the spray head shown in Figure 11, in vertical section passing through the nucleation device
• - Figure 18 shows a section along 18-18 of Figure 17;
• - Figure 19 shows a variant of a nucleation device with two nozzles, common to two rows of spray nozzles.
• the spray head can be, as shown in FIG. 1, in the form of an annular sleeve 1 carried by a base or foot 2. This head has on its downstream face 3, several orifices represented by crosses. The water which arrives under pressure at the level of these orifices is sprayed axially.
• This spray head 1 is arranged to receive at the aforementioned orifices, several families of spray nozzles such as for example family number 1 which includes the nozzles marked 1.1, 1.2, 1.3 ...
• Each family 1, 2, 3 is supplied with pressurized water in a separate manner, according to characteristics specific to each of them.
• the head 1 and in particular its body comprises several chambers as shown in FIGS. 2 to 5, each of the chambers serving to supply a family or series of spray nozzles.
• FIGS. 2 to 5 show, schematically and simply functional, a section of the body of the spray head.
• This body of annular shape, FIG. 1, can just as well be rectilinear or other as for example in the shape of a tuning fork; it comprises several chambers and in particular three chambers in the examples detailed in FIGS. 2 to 5.
• the spray nozzle 11 shown in FIG. 2 is a nozzle which corresponds to family number 1. This nozzle is in communication with the chamber 5 which receives pressurized water, as shown in FIG. 5, by means of a pipe d food 15.
• each chamber 5, 6 or 7 is therefore usable for supplying the different families of nozzles.
• the chamber 5 feeds the nozzles of the family number 1.
• the cartridge 12 in fact comprises one or more orifices 21 which make it possible to put the chamber 5 in communication with the nozzle, the water being ejected through the nozzle 13.
• FIGS. 3 and 4 represent, like FIG. 2, a section of the chambers 5, 6 and 7 as well as of the nozzles 11.
• FIG. 3 shows a nozzle 11, the cartridge 12 of which has orifices 22 which enable said nozzle to be placed in communication with the chamber 6 for spraying water under pressure through the nozzle 13.
• FIG. 4 shows the nozzle 11 and in particular its cartridge 12 provided with orifices 23 which put said nozzle in communication with the chamber 7.
• FIG. 1 illustrates, for a first embodiment, a spray head which comprises a body in the form of an annular sleeve provided with a foot 2.
• the body and the foot 2 are preferably produced by molding in a single piece, of alloy lightweight.
• the chambers 5, 6 and 7 which are annular in shape, can be obtained directly by molding.
• the foot 2 comprises the channels corresponding to the pipes 15, 16 and 17 shown in FIG. 5.
• This foot 2 is also arranged so that it can be fixed for example on a pole 25 like that described in the aforementioned document FR-2,743,872.
• This pole 25 which appears in thin dashed lines in FIG. 6, comprises pipes obtained for example directly by spinning, which make it possible to supply pressurized water to the chambers of the spraying device and, in addition, thanks to a central pipe, supplying pressurized air to a nucleation device or nucleator.
• the channel 31 also extends to the upper part of the support 29 and it allows the supply of a particular nozzle 11 'which passes through the chambers 5, 6, 7, and the upper part of the support 29.
• This nozzle 11' is present in the form of a cartridge also mounted in leaktight manner in the body 1 and this nozzle 11 ′ is provided, at the level of the channel 31, with orifices 33 which allow the passage of the water under pressure to the nozzle of spray 13.
• a circulation of water is thus obtained in the support 29 and, as detailed below, in the nucleator 27 proper, which has the effect of avoiding freezing or even defrosting the water and / or air nozzle. of said nucleator, during the commissioning of the installation or during its operation.
• the channel 30 arranged in the support 29 is in communication with the channel 18 which conveys the air under pressure.
• Figure 9 shows in more detail, the nucleator 27 itself.
• this nucleator comprises a central nozzle 35 which sprays the air brought under pressure through the channel 30, and a nozzle 36 for spraying the water which is brought under pressure through the channel 31.
• the pressurized air arrives in a chamber 37 fitted in the support 29 and centered on the axis 9 of the spray head.
• This chamber 37 is closed by a cap 39 fixed at the rear, that is to say upstream of the support 29, and this cap supports a filter 40 which is interposed between the channel 30 and the nozzle 35.
• the nozzle 35 is mounted on a drilled block 41 which is fixed on the downstream face of the support 29.
• This block 41 has an axial cavity centered on the axis 9 to accommodate the nozzle 35 and there is a chamber 42 arranged around the nozzle 35 , substantially at mid-length, which chamber 42 communicates with channels 43 which allow a junction of the channels 31 arranged in the lower part and in the upper part of the support 29.
• These channels 43 establish a continuous circulation of water in the bored block 41, around the nozzle 36 and around the nozzle 35.
• the nozzle 35 is a nozzle of the type provided with a deflector 45 which makes it possible to obtain a flat jet.
• This flat air jet is struck by the water jet from the nozzle 36.
• This nozzle 36 is in fact placed under the nozzle 35, making an angle of the order of 45 ° with the axis 9 of the nozzle 35.
• the orifice 38 of the nozzle 36 has a very small diameter, less than 1 mm. This nozzle 36 soaks in the water which circulates to supply the nozzle 11 ′, which makes it possible to avoid freezing and blocking of the orifice 38.
• this orifice 38 by its very small size, allows to obtain a regular jet regardless of the pressure in the supply circuit of the nozzle 11 '.
• the above nucleation device is of the external mixing type, that is to say that the water and the air are mixed outside the spray head but in the central cavity 39 of the body and upstream nozzles 11.
• the ai-water mixture is carried out with a very large ratio at least equal to 200.
• FIG. 7 shows the different nozzles 11 distributed on the downstream face 3 of the body of the head as well as the nozzle 11 'disposed at the upper part in the median vertical plane.
• the jets of these different nozzles are for example flat spectrum sprinklers, arranged in planes parallel to each other so as to form strata.
• nozzle 35 placed in the center of the spraying device as well as the nozzle 36 which projects a jet of pressurized water into the air jet of the nozzle 35.
• the various nozzles 11 and the nozzle 11 ′ cause and induce an air current in the body of the head 1 and around said body, promoting the water / air mixture for the formation of snow.
• FIG. 8 shows, seen from the rear, the spray head provided with the nucleation device 27.
• the body further comprises chambers 5, 6 and 7 which are supplied with pressurized water, a chamber 4 arranged upstream of the preceding chambers, also of annular shape, and which is supplied with pressurized air by means of channel 18 which is fitted in foot 2 and communicates with said room 4.
• a nucleator consisting of a mini-barrel 52 and conventional spray nozzles 11 distributed over the downstream face 3 of the body of the head according to several families, each of these families being supplied by means of chambers 5, 6 or 7 as required with, of course, all the possibilities for producing a sort of mixture of nozzles.
• the nozzle or mini-barrel 52 comprises a cartridge 53 which passes tightly through the chambers 5, 6 and 7.
• This cartridge 53 is provided with an axial cavity which acts as a mixing chamber 54 and its wall is pierced with at least one orifice 55 located in the chamber 5, which chamber is supplied with water under pressure.
• the cartridge 53 thus dips in the water supplying the nozzles 11, which makes it possible to avoid freezing of the orifice (s) 55.
• the orifice (s) 55 have a cross section which corresponds to or which is even less than the circular cross section of an orifice whose diameter is of the order of 1 mm.
• the pressure drop caused by this or these orifices allows an operation of the nucleator whatever the pressure of the water in the chamber 5 in particular.
• a part 63 can serve as an intermediary, as shown in FIG. 11.
• This part 63 is slightly bent to give the head 1 a favorable inclination, close to the vertical, or slightly inclined to cause the water to be sprayed at an angle which favors projection over the greatest possible distance depending on needs and site.
• the head 1, FIG. 11, consists of a tubular jacket 64 and a cylindrical core 65 centered in said jacket, and whose diameter is less than that of said jacket to allow the passage of water under pressure.
• the core 65 comprises circular radial partitions which divide the internal space between the jacket 64 and said core, in several chambers.
• Each chamber supplies one or more nozzles 75 located on one or more generators of the cylindrical envelope of the jacket 64.
• the chamber 66 which constitutes the main chamber, may comprise several nozzles 75 distributed over several generators.
• the sprinklers 75 of the chambers 70 and 72 are complementary sprinklers which are used independently of those of the chamber 66, depending on the climatic conditions to increase the quantities of snow produced according to these climatic conditions.
• Each room is supplied by a channel which opens at its lower part.
• the seal between the jacket 64 and the various partitions 67, 69, 71 and 73 is produced by means of O-ring seals 80 arranged in the thickness of said partitions.
• the lower part of the core 65 comprises a base 81 in the form of a radial shoulder, on which the lower end 82 of the jacket 64.
• the core 65 extends above the upper end 83 of the jacket 64 and is covered by a cap 84 which is fixed by screws 85 taken in the upper cylindrical end 86 of the core 65.
• the joint plane 87 between the jacket 64 and the cap 84 is disposed between the O-ring 80 of the partition 67 and an O-ring 89 disposed in a groove arranged in the upper cylindrical end 86 of the core 65.
• the cap 84 is positioned relative to the core 65 in a precise manner either by means of an original distribution of the screws 85 and / or a centering pin 90. This position of the cap 84 makes it possible to place the shirt 64 in a precise position also by means of the centering pin 90 interposed between the two at the joint plane 87.
• the cartridge 92 of the nucleation device is fixed by any appropriate means in the cap 84, by screwing for example; it will be detailed later.
• the sprinklers 75 are supplied with pressurized water from channels which bring the pressurized water into the different chambers.
• the distribution of these channels in the core 65 appears on the different sections represented in FIGS. 14 to 16 and, in dotted lines in FIG. 11.
• the nucleation device 91 which in fact constitutes a sort of mini high-pressure snow cannon with very high air / water ratio, at least equal to 200, is supplied with pressurized water by means of one of the supply channels of the rooms and in particular by means of the channel which feeds the main room 66.
• This mini cannon is also supplied with pressurized air.
• a channel 95 disposed in the center of the core 65, which extends into the cap 84, in the form of a central blind hole. This channel 95 allows the pressurized air to be brought up to the level of the nucleation device 91 and in particular to the downstream inlet of the mixing chamber of said device, detailed below.
• the chamber 66 is arranged just below the nucleation device 91; it is supplied with pressurized water by means of a channel 96 which also extends into the cap 84, which cap has an annular cavity 97 which is crossed by the cartridge 92 of the nucleation device 91.
• the channel 96 extends over the entire length of the core 65; it communicates with the annular cavity 97 arranged in the cap 84 and a second channel 99 arranged in the core 65 extends from said cavity 97 of the cap 84, to the lower part of the chamber 66, opening at the level of the orifice 76 in said chamber to supply the latter.
• the chamber 66 supplies several nozzles 75, arranged in pairs on two different generators. These nozzles 75 are aligned vertically with the nozzles arranged at the level of the other chambers 70 and 72 and also with the nucleation devices 91.
• the orifice 76 is located at the lower part of the chamber 66.
• a small channel 100 of small diameter which extends between channel 99 and channel 96, arranged in such a way that it allows total drainage of the water located in chamber 66, when the water supply is cut off.
• the diameter of this channel 100 is of the order of 1 / 5th of the diameter of the channels 96 and 99 in order to maintain a preferential circulation of the water under pressure, in the cavity 97 of the cap 84.
• FIG. 15 shows a section at the orifice 77 which allows the supply of the chamber 70 and the nozzles 75.
• This orifice 77 is supplied by means of a channel 101 which extends axially in the core 65.
• the channel 102 is located under the channel 99, centered practically on the same axis.
• the lower end of the channel 99 and the upper end of the channel 102 are separated by a distance which corresponds substantially to the height of the chamber 70.
• FIG. 12 shows the detail of one of the orifices for introducing pressurized water into the cartridge 92 of the nucleation device 91.
• This cartridge 92 of tubular shape, has in its central part an axial chamber 103 which opens downstream on the side of the nozzle 93 and which is open upstream on the channel 95 in the cap 84.
• orifices 94 are situated rather upstream of the mixing chamber 103.
• the external wall of the cartridge 92 is drilled radially with a first hole 104 whose diameter is less than 1 mm, and a second hole or counterbore 105 of much larger diameter.
• the diameter of the hole 105 is of the order of ten times the diameter of the hole 104.
• the length of the hole 104 is of the same order as its diameter.
• this nucleation device 91 is similar to a mini snow cannon of the high pressure type, in which the air / water ratio is very high, at least equal to 200 and preferably much higher.
• the spray head 1 and in particular the base 106 of the core 65 is fixed by means of screws 107 on the intermediate connector 63, which connector 63 is itself fixed by means of screws not shown, on the end of the mast 25 .
• FIG. 13 shows the distribution of the screws 85 which make it possible to fix the cap 84 on the upper end of the core 65.
• the distribution of the screws is such, as indicated previously, that it imposes a precise orientation of the head relative to the core 65 and consequently, an orientation defined also for the jacket 64 which carries the nozzles 75, by means of the centering pin 90 interposed between said jacket and said core.
• FIG. 17 represents a variant of the spray head represented in FIG. 11.
• This figure 17 shows a portion of the intermediate piece 63 on which the core 65 'is fixed.
• the core 65 ' is in the form of a molded and machined part, made of light alloy, and resembles a sort of hydraulic drawer threaded in an envelope 64'.
• This envelope 64 ′ is itself made up of a molded piece of light alloy, held between the lower shoulder 81 of the core and the cap 84 ′ which is fixed by screws 85 ′ to the upper end 86 ′ of the core 85 '.
• the chambers 66, 70 and 72 are, as before, arranged between partitions. Thus we find the upper partition 67 which delimits with the partition 69, the annular chamber 66.
• the annular chamber 70 is delimited by the partition 69 and the partition 71.
• This partition 71 is interposed between the chamber 70 and the chamber 72, which annular chamber 72 is delimited at its lower part by the partition or shoulder 73.
• the partitions may have diameters which increase slightly from the end of the core to its base 81.
• These chambers are supplied as previously for the head shown in FIG. 11, by conduits which appear in thin dashed lines and which open out by means of a radial borehole at the bottom of each of said chambers. These radial boreholes are also inclined so as to allow effective and total emptying of each of the chambers to prevent freezing when the spraying stops.
• the orifice 76 which makes it possible to introduce the pressurized water into the chamber 66.
• This introduction into the chamber 66 takes place directly at the lower part without passing, as above, FIG. 11, through the cap 84.
• the chamber 70 is supplied by the orifice 77 and the chamber 72 is supplied by the orifice 79.
• the nucleation device is supplied with pressurized air at the upstream end of its mixing chamber 103, and the supply of pressurized water is carried out by means of one or more orifices 94 arranged in the wall cartridge 92. These orifices 94 are located in the chamber 66, supplied with pressurized water at the same time as the spray nozzles 75.
• the cartridge 92 of the nucleation device 91 soaks in the water which circulates in the chamber 66 which makes it possible to avoid the phenomena of freezing and blockage of the water injection holes in the mixing chamber 103.
• the nucleation devices 91 serve to angularly position the casing 64 'of the spray head relative to the core 65' due to their fitting into radial cavities of the latter.
• the nozzle 93 of the nucleation device 91 is oriented like all the nozzles 75, perpendicular to the longitudinal axis 109 of the head 1. It is arranged under the nozzles 75 of the main chamber 66 and not above as in the case of the head shown in Figure 11.
• FIGS. 17 and 18 show that the core 65 ′ has a countersink 111 at each of the orifices 110 in which the cartridge 92 of the nucleation devices 91 is fitted.
• FIG. 17 shows an alternative embodiment of the mounting of the nucleation device on the spray heads in the form of columns shown in FIGS. 11 and 17.
• the nucleation device 91 ' comprises a cartridge 92' which is provided with two nozzles or nozzles 93 '.
• the cartridge is centered in the median plane of the dihedron formed by the two rows of spray nozzles 75 while the nozzles 93 'are oriented parallel and respectively to each face of said dihedron.
• nucleator comprises, in this case, orifices

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• Thermal Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Nozzles (AREA)
• Buildings Adapted To Withstand Abnormal External Influences (AREA)
• Road Signs Or Road Markings (AREA)
• Special Spraying Apparatus (AREA)

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• 1999
  • 1999-02-05 DE DE69914182T patent/DE69914182D1/de not_active Expired - Lifetime
  • 1999-02-05 EP EP99902606A patent/EP1053440B1/de not_active Expired - Lifetime
  • 1999-02-05 JP JP2000530751A patent/JP2002502951A/ja not_active Withdrawn
  • 1999-02-05 WO PCT/FR1999/000258 patent/WO1999040381A1/fr not_active Ceased
  • 1999-02-05 AU AU22841/99A patent/AU2284199A/en not_active Abandoned
  • 1999-02-05 US US09/601,680 patent/US6508412B1/en not_active Expired - Lifetime
  • 1999-02-05 CA CA002319692A patent/CA2319692A1/fr not_active Abandoned
  • 1999-02-05 AT AT99902606T patent/ATE257935T1/de active
• 2000
  • 2000-08-04 NO NO20003957A patent/NO312380B1/no not_active IP Right Cessation

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