WO2021148452A1

WO2021148452A1 - Atomiser for spraying a liquid

Info

Publication number: WO2021148452A1
Application number: PCT/EP2021/051170
Authority: WO
Inventors: Renier DE CARITAT DE PERUZZIS; Olivier DE CARITAT DE PERUZZIS; Xavier HELBOIS
Original assignee: Vangeel Electrical M.S.F.
Priority date: 2020-01-23
Filing date: 2021-01-20
Publication date: 2021-07-29
Also published as: BE1028008B1; EP4093553A1; BE1028008A1

Abstract

Atomiser for spraying a liquid to be sprayed, comprising - a means for supplying the liquid to be sprayed, which means is provided with an outlet for the liquid to be sprayed; - a rotating means coupled to a shaft, the rotating means being arranged to rotate the shaft; - a spray cage provided with perforations arranged to spray the liquid in the form of droplets into the air, the spray cage being rigidly attached to at least one portion of the shaft; the shaft comprising at least one hollow shaft section for transporting the liquid between the means for supplying the liquid to be sprayed to the spray cage and the outlet for the liquid to be sprayed.

Description

ATOMIZER FOR SPRAYING A LIQUID

The present invention relates to a dust suppression system. The present invention relates more particularly to an atomizer for spraying liquid, used for removing dust, humidifying the air, spraying an active product or for adiabatic cooling.

When handling lumps or grains, fine particles, resulting from the abrasion of lumps or grains, escape into the environment. They create a layer of dust on the surface of the handling site ef / or remain suspended in the surrounding air. In both cases, these fine particles must be removed and treated because they present a risk of pollution or a health risk.

Although there are systems making it possible to collect these fine particles and to treat them for their elimination or reprocessing, systems have also been developed which make it possible to reduce their escape into the environment by well known dust slaughter systems. For example, the technique of spraying a liquid in fine droplets onto materials is known. Typically, it is known to spray water over conveyor belts in order to keep dust on the conveyor out of the atmosphere or to spray mists around dust generating areas, such as areas load and unload from trucks don † the tipper contains dust-generating materials. The fine droplets of liquid make the dust particles heavier to precipitate them downwards, oneself on the ground, oneself in the container from which they come (conveyor, truck body, container, etc.)

The atomization / vaporization of liquid is typically done by means of nozzles whose outlet orifice size determines the size of the vaporized liquid droplets which are of the order of micrometers to millimeters.

When the droplets are fine (of the order of a micrometer) and the outlet openings of the nozzles are small, the risk of clogging and clogging is high, which creates a loss of efficiency in the removal of dust. In addition, the clogging of the outlet orifices of the nozzles increases maintenance costs and leads to clouds of drops / droplets which are not homogeneous and consequently poor dust suppression.

When the droplets are larger (from 1 to several millimeters), the spray nozzles also present a risk of clogging, thus generating a loss of efficiency although less than for fine droplets. On the other hand, the water consumption is greater, which may imply a treatment of the resulting sludge which is more restrictive and more expensive.

Another known dust abatement technique is ultrasonic atomizer liquid misting consisting in atomizing a liquid by subjecting it to sound waves generated by a resonance chamber built within the spray nozzle. The liquid is put into vibration, which makes it possible to detach microdroplets which are then entrained by a flow of air. Unfortunately, this technique is not suitable for a large liquid flow rate because it requires having a tank in which the water is vibrating. The vibrating water reserve is a reservoir of stagnant water, which is subject to biological risks and which must be regularly emptied, at the risk of introducing charged water into the misting device, which then also causes a clogging of the outlet of the spray nozzle or if the changes are regular, an increase in water consumption.

There are also automatic sprinkler systems where a liquid is sprayed through a hose. A garden hose is made of a flexible material connected to a power supply at one end and can be connected to a garden hose accessory at the other end such as a nozzle. This technique has the drawback of consuming a lot of liquid and the distribution of liquid per unit area is unfortunately not very homogeneous. Another existing spray system is to send a liquid through a spray cage which rotates at high speed to break the liquid into droplets. This system comprises a spray head, in the form of a cylindrical cage, mounted directly on the motor shaft. A liquid supply arrives laterally to the motor shaft. This solution is more compact compared to the means of nozzle e † allows to create homogeneous microgou †† ele †† es †† es. In addition, the droplet size is easily configurable with the rotational speed of the spray cage. But this solution limits the flow of liquid. In addition, water supply is complex and requires a lot of parts.

Finally a last technique on vaporization is based on the fai † of sending a liquid to a parabolic spray disc allowing the liquid to diffuse into the disc by centrifugal force. Often the liquid is supplied by a hollow shaft in the center of the parabolic disc. For example, the patents CN201728167 and † CN 106787379 disclose such an atomizer. This system is not suitable for atomizing a liquid in a fine and homogeneous way since it does not allow to create microgou †† ele †† es of small sizes as with a spray cage. Atomizers are also used in other areas. For example in the field of chemical, food and general processing industries for the spraying of a liquid in an evaporation chamber.

Document GB1361606 illustrates such an atomizer comprising a hollow shaft. However, the hollow shaft is driven by a motor, the motor is coupled to the hollow shaft through a transmission belt.

A similar atomizer is illustrated in the patent US3361352 for the application of the active substances in agriculture and horticulture.

WOOO / 72975 and FR2507104 show atomizers driven by a flow of air from a fan. A "cage" rotates around a fixed hollow shaft which supplies the "cage" with the liquid to be sprayed.

There is therefore a real need to produce the finest liquid droplets possible in order to control not only the dust, the quantity of liquid used and to homogenize the distribution of liquid throughout the inferred volume † .

The purpose of the invention is to overcome the drawbacks of the state of the art. In particular, the object of the invention is to provide an atomizer which creates microgou †† ele †† es of small size e † which makes it possible to increase the quantity of liquid to be atomized.

To solve this problem, there is provided according to the invention an atomizer for spraying a liquid comprising means for supplying said liquid to be sprayed, provided with an outlet for said liquid to be sprayed; a rotating means coupled to a shaft, the rotating means being arranged to rotate the shaft, the rotating means (4) is a motor; a spray cage provided with perforations arranged to spray said liquid in droplets into the air, the spray cage being integral with at least part of said shaft; said shaft comprises at least one hollow shaft section for passing liquid between said means for supplying said liquid to be sprayed to said spray cage and said outlet for said liquid to be sprayed.

By the term “shaft section” within the meaning of the present invention, is meant a part of the shaft between 1 and 100% of the length of the shaft. The at least one section of the shaft may be a hollow shaft along the entire length of the shaft or a hollow shaft only over a first section of the shaft and not over a remaining second section of the shaft.

The supply of liquid by said at least one hollow shaft section makes it possible to increase the volume of liquid to be sprayed in the spray cage. In addition, said hollow shaft section supplies the liquid to be sprayed to the center of the cage and allows better distribution of liquid in the cage and even finer microdroplets. In addition, this makes it possible to more precisely adjust the flow rate of liquid to be sprayed in a very wide range of values by adjusting the flow rate of the atomizer as required. It is the flow rate at the inlet of said hollow shaft section which generates the quantity of liquid in the cloud. This solution has the advantage of requiring little maintenance. This system has no nozzles, which provides the advantage of avoiding the risk of clogging linked to natural wear or lack of maintenance as well as the risk of clogging. This system creates microdroplets smaller in size than a parabolic atomizer. The atomizer has the advantage of being reliable, being able to operate stably in a small space and allowing easy replacement of the interchangeable parts of the atomizer. Preferably, the motor comprises a motor shaft which rotates about an axis of rotation of the motor, and the axis of rotation of said shaft is coaxial with the axis of rotation of said motor. The atomizer is therefore very compact and does not require the use of bulky transmission means.

Preferably, said shaft is the motor shaft and / or is supported by the motor bearing. This allows the motor bearing to be used to hold the shaft and spray cage. This reduces the number of pieces of the atomizer.

Preferably, the shaft is a shaft passing through the motor. The atomizer is therefore very compact and does not require the use of bulky transmission means. The hollow shaft section through which the liquid passes has the advantage of cooling the bearings when the system rotates.

Preferably, said at least one hollow shaft section for passing liquid between the supply means and said outlet for spraying / atomizing liquid extends over the entire length of said hollow shaft. When said shaft is entirely hollow, it is then possible to supply the liquid to be sprayed at the end opposite to that to which the spray cage is connected, namely upstream of the engine, the spray cage being located downstream of the engine , depending on the flow of liquid to be sprayed.

According to one embodiment, the shaft has only a partial hollow section when the supply is carried out at the level of the end to which the cage is fixed (opposite the motor).

According to an advantageous embodiment, a side wall of the hollow shaft is perforated with a series of perforations to allow said liquid to exit from the hollow shaft into the spray cage. According to an advantageous embodiment, said series of perforations of the side wall of the perforated hollow shaft comprises at least perforations of different orientations to allow the exit of said liquid to be sprayed from said hollow shaft in different directions of the spray cage.

According to an advantageous embodiment, each perforation x of said series of perforations of the hollow shaft comprises an output section having a surface T _x with x which represents an integer, and in which the sum of the surfaces Ti to Tx is † greater than the cross section of said hollow shaft.

According to an advantageous embodiment, said spray cage comprises a series of concentric side walls.

According to an advantageous embodiment, at least part of said perforations of said spray cage are present on several concentric side walls among the series of concentric side walls.

According to an advantageous embodiment, a first side wall of said series of side walls of said spray cage has a first plurality of perforations e † a second side wall of said series of side walls of said spray cage, concentric with the first side wall has a second plurality of perforations, e † in which each perforation, said first plurality of perforations has an exit section Si e † each perforation of said second plurality of perforations has an exit section S2 different from the exit section Si.

According to an advantageous embodiment, a first side wall of said series of side walls of said spray cage has a first plurality of perforations e † a second side wall of said series of side walls of said spray cage, concentric with the first side wall has a second plurality of perforations, e † wherein each perforation said first plurality of perforations has an outlet section Si e † each perforation of said second plurality of perforations has an outlet section S2 equal to the outlet section Si. According to an advantageous embodiment, said perforated side wall is a grid.

In a particular embodiment, the rotating means is a motor, preferably an electric motor, which makes the atomizer robust and allows high speed rotation.

According to an advantageous embodiment, the hollow shaft is a shaft passing through said motor. According to an advantageous embodiment, one end of said hollow shaft, opposite one end of the hollow shaft leading into the spray cage, preferably at the center thereof, is connected to an inlet for the liquid to be sprayed.

According to an advantageous embodiment, said hollow shaft comprises a first hollow shaft part e † a second hollow shaft part, said first hollow shaft part being coupled to said rotating means to be driven in rotation by the means for rotating at a speed of rotation vi while said second hollow shaft part forms at least one hollow shaft part integral with said spray cage, said first hollow shaft part e † said second part d 'hollow shaft being connected together by a coupling element. According to an advantageous embodiment, said coupling element is a differential element such as for example a hydraulic coupling arranged to give said second hollow shaft part a speed of rotation V2 different from vi. According to an advantageous embodiment, the second part comprises said series of perforations to allow said liquid to exit from the hollow shaft into the spray cage.

According to a second aspect, the present invention relates to a method for atomizing a liquid to be sprayed, comprising the following steps: supplying a liquid to be sprayed at one end of at least part of a hollow shaft, set in rotation at a speed vi of said hollow shaft and at a speed V2 of said spray cage with vi and V2 which are equal or different, a spraying of said liquid to be sprayed by leaving said liquid through a series of perforations of said hollow shaft e † then by a series of perforations of said spray cage.

Preferably, the method of atomizing a liquid to be atomized in which said spray cage comprises a series of perforated concentric walls e † in which said outlet of the liquid through a series of perforations of said spray cage comprises a passage of said liquid to spray through the succession of concentric walls.

According to a third aspect, the use of an atomizer relates to the removal of dust, the humidification of the air, the spraying of an active product or the adiabatic cooling.

Other embodiments of the atomizer for atomizing a liquid according to the invention are indicated in the appended claims. Other characteristics, details and advantages of the invention will emerge from the description given below, without limitation and with reference to the drawings and to the examples.

Figure 1 shows an exploded view of an atomizer according to the invention;

FIGS. 2A and 2B represent an exploded view in section of the atomizer according to the invention;

Figure 3 shows a sectional view of a spray cage connected to a hollow shaft;

Figure 4 is a perspective view of the spray cage connected to a hollow shaft.

Figures are not drawn to scale. In the figures, identical or similar elements bear the same references.

FIG. 1 illustrates an example of an atomizer 1 for spraying a liquid according to the present invention. Said atomizer 1 comprising a hollow shaft 2, a spray cage 3, a motor 4.

The hollow shaft 2 comprises a series of perforations 5 at the level of the hollow shaft section 2 which will be housed in the spray cage 3 when the atomizer 1 is mounted. The hollow shaft 2 includes a series of perforations 5 at the outlet section T of the hollow shaft 2 which will be housed in the spray cage 3 when the atomizer 1 is mounted. The motor 4 is intended to supply the energy necessary for the rotation of the hollow shaft 2 to which it is coupled. A liquid to be sprayed is supplied through a supply 6 (not shown) intended to supply the liquid into the hollow shaft along its entire length. The liquid to be sprayed leaves the hollow shaft 2 in the spray cage 3. The spray cage 3 comprises a series of perforations (see details in figure 4) for spraying said liquid leaving the hollow shaft.

RECTIFIED SHEET (RULE 91) ISA / EP 2 in droplets in the air. The hollow shaft 2 is arranged to drive the liquid from the feed into the spray cage 3 as can be seen in FIG. 2A or 2B, the feed comprises a fixed part 6a intended to be connected to a liquid inlet. to be sprayed and a rotating part 6b (rotating joint) making it possible to be secured to the hollow shaft by means of a connector 6 '. The rotating joint 6b allows one by † that the fixed part of the power supply 6a does not rotate while the other by †, it ensures the seal between the power supply e † the connection provided 6 'connecting the hollow shaft to the power supply 6.

The motor 4 makes it possible to supply mechanical energy to a shaft in order to transmit a rotational movement. The preferred embodiment of the invention uses an electric motor, it is nevertheless possible to use all types of motor such as for example a hydraulic motor. The motor includes a motor shaft. The motor shaft rotates around an axis of rotation of the motor. The hollow shaft 2 is preferably arranged coaxially with the motor shaft or with an axis of rotation X of the hollow shaft 2. Preferably, the hollow shaft 2 is the motor shaft. Preferably, the hollow shaft 2 is maintained by the bearing 19 of the motor. Instead of a motor, we could also use another energy transmission means to drive the rotation of the hollow shaft 2. In the illustrated embodiment, the hollow shaft 2 is a shaft passing through the shaft. motor 4. The atomiser is therefore very compact and does not require the use of bulky transmission means.

The hollow shaft 2 is rotated around the axis of rotation X. Preferably, the motor 4 is † designed to generate a speed of rotation of the hollow shaft 2 between a minimum speed e † a maximum speed for adapt the speed of rotation of the hollow shaft 2. Preferably, the motor 4 is arranged to rotate the hollow shaft 2 ef / or the spray cage 3 with a minimum speed greater than or equal to 100 ovens per minute, preferably at 500 revolutions per minute, preferably at 1000 ovens per minute, more preferably at 5000 ovens per minute. The maximum speed is preferably less than or equal to 15,000 ovens / minufe, preferably less than or equal to 10,000 ovens / minufe.

As can be seen in FIG. 2A, the hollow shaft 2 is a shaft provided over its entire length with an internal central channel allowing a flow of liquid to pass. The hollow shaft 2 is designed to allow free passage and / or attachment of elements or accessories. The hollow shaft 2 can be fitted with internal and external bearing surfaces, keyways, bores and various types of end caps. The ends can be threaded, conical or grooved for example. The embodiment illustrates a rotating hollow shaft, but it would be possible to have a fixed tube to allow circulation of the liquid inside the rotating hollow shaft. The rotating hollow shaft 2 makes it possible to carry the control members, to receive and transmit the engine torque to machines and industrial equipment.

The spray cage 3 is arranged on at least part of the hollow shaft 2. Preferably, the spray cage 3 defines a substantially cylindrical volume, a first base 7 of which is pierced with an orifice 9 to be traversed by the. hollow shaft 2. The second base 8 can be a solid wall or can have perforations.

Between the two bases of the substantially cylindrical volume, extends a perforated side wall 15, the two bases being possibly connected to each other by one or more spacers 10.

The spray cage can be attached to a part of the hollow shaft or it can be an integral part of a part of the hollow shaft forming one and the same part. If the spray cage 3 is fixed to a part of the hollow shaft 2, the hollow shaft 2 comprises at least one fixing at the level of the first base 7 of the cage. spraying 3 to allow it to be fixed. The hollow shaft comprises (in the direction of the flow of the liquid to be sprayed) a first end 1 1 arranged to be connected to the power supply 6 e † a second end 12 opposite to the first end 1 1, ending in the cage spray 3. In the example illustrated in FIG. 2A, the hollow shaft 2 has a lower channel extending from the first end 1 1 to the second end 12. The hollow shaft 2 is preferably arranged so as to cross the engine as follows.

In this example, the feed 6 is carried out directly along the axis of rotation X of the rotating hollow shaft 2. The liquid enters the hollow shaft 2 through the first end 1 1. Preferably, the supply 6 comprises a connection means 6 'intended to connect the external supply 6 of liquid to the atomizer via the hollow shaft 2.

As can be seen in figure 2B, it is also possible to position the liquid supply 6 at the level of the second end 12 of the hollow shaft 2. The hollow shaft 2 is solid on the side of the hollow shaft 2. end 1 1 passing through motor 4 e † hollow shaft 2 has perforations on end 12 allowing atomization of liquid through spray cage 3. The hollow shaft section 2 extends from the second end 12 towards the first end 1 1 over a length of shaft intended to be housed in the spray cage 3.

In the preferred example illustrated in Figure 3, the hollow shaft 2 comprises at least one series of perforations 5 in the side wall 13 of the hollow shaft 2 housed in the spray cage 3. Preferably, a side wall 13 of the hollow shaft 2 is perforated with a series of perforations 5 to allow liquid to escape from the hollow shaft 2 into the spray cage 3. The perforations 5 of said series of perforations are distributed around the axis of rotation X (radial position), preferably with an equitable distribution, i.e. according to an equivalent angle between two neighboring perforations 14 (not illustrated). Preferably †, the perforations 5 of the side wall 13 of the hollow shaft 2 are † arranged on the same axis as the hollow shaft 2 in the direction of the X axis. The series of perforations 5 of the side wall 13 of the perforated hollow shaft 2 comprises at least perforations 5 of different orientations to allow the exit of the liquid to be sprayed from the hollow shaft 2 in different directions of the spray cage 3. In a preferred embodiment, the perforations 5 on the part of the hollow shaft 2 housed in the spray cage 3 all have the same radial orientation and / or the same axial orientation. Preferably, the perforations 5 of said series of perforations on the part of the hollow shaft 2 housed in the spray cage 3 all have the same shape e † all have an outlet section T _x identical (with x which represents the number perforations). Preferably, each perforation 5 of the series of perforations 5 of the hollow shaft 2 comprises an output section having an area T _x with x representing an integer, e † in which the sum of the areas Ti to Tx is greater than the cross section of the hollow shaft 2.

The fair distribution, the same axial position, the same axial orientation and / or the same radial orientation of the perforations 5 of said series of perforations on the part of the hollow shaft 2 housed in the spray cage 3 have the advantage of allowing the liquid entering the spray cage 3 to be distributed evenly in the spray cage 3. The axial orientation of the perforations 5 of said series of perforations on the part of the hollow shaft 2 housed in the spray cage 3 is † preferentially in the radial direction relative to the direction of the axis of rotation X of the hollow shaft. But it is also possible that the axial orientation of at least one perforation 5 of said series of perforations has an inclination, that is to say extends at a non-zero angle between the radial direction relative to the direction X e † axis of the perforation (that the liquid ejected in a radial direction extends with an axial component in the direction of the first end 1 1 of the hollow shaft 2 or of the second end 12 of the hollow shaft 2. The orientation at least one perforation 5 of said series of perforations is preferably in the radial direction relative to the direction X of the axis of the hollow shaft, but it is also possible that the radial orientation of the perforations 5 presents an inclination, i.e. extends at a non-zero angle between the radial direction relative to the direction of the X axis and the perforation axis (that the liquid ejected in a radial direction extends with a radial component in direction of rotation or opposite to the direction of rotation of the hollow shaft 2).

The outlet section T _x of at least one perforation 5 of the hollow shaft 2 of said series of perforations is preferably circular in shape (in the section perpendicular to the axis of the perforation Z), but the section of the perforation 14 can also be of another shape such as for example an ellipsoid, a rectangle, a slit, etc. The perforation axis preferably extends rectilinearly, but it is also possible to make curved perforations. The perforations 5 of the shaft can be positioned in the same axial position. It is also possible to have several pluralities of perforations 5 in which each plurality comprises several perforations 5 in the same axial position. Each plurality of perforations positions the perforations 5 in another axial position. It is also possible to position pluralities of perforations at different axial position.

A first side wall 15 of said series of side walls of said spray cage 3 has a first plurality of perforations 17 and a second side wall 16 of said series of side walls of said spray cage 3, concentric with the first side wall present a second plurality of perforations 18. Each perforation 17 of said first plurality of perforations has an output section Si and each perforation 18 of said second plurality of perforations has an output section S2 equal to the output section Si. Alternatively, each perforation 17 of said first plurality of perforations. perforations has an output section Si and each perforation of said second plurality of perforations has an output section S2 different from the output section Si.

In an alternative example, provision is made for the liquid to exit through the second end 12 of the hollow shaft. But this requires additional distribution to properly distribute the liquid leaving the second end 12 of the hollow shaft 2. It is also possible to combine a liquid outlet through the side wall and through the second end 12 (from axially) from the hollow shaft 2 into the spray cage 3.

The spray cage 3 is arranged to spray the liquid coming from the hollow shaft 2 into the air. FIG. 4 illustrates the spray cage 3 in the example illustrated. The spray cage 3 preferably comprises a first side wall 15 and a second side wall 16 located around the first side wall 15. Each side wall 15, 16 comprises a series of perforations 17, 18 for spraying the liquid into the air. . At least part of the perforations 17 of the spray cage 3 are present on at least one side wall 15 forming a perforated side wall 15, 16 for laterally spraying the liquid in droplets into the air.

The perforated side wall 16 is arranged concentrically around the hollow shaft 2 and the side wall 15. At least part of the perforations 18 of the spray cage 3 are present on the side wall 16. The perforations 17, 18 of the spray cage 3 are arranged such that the liquid can pass through these perforations 17, 18 for spraying the liquid. The liquid, pushed outwards, is ejected through the perforations 17, 18 which cut the liquid into droplets. The size of the droplets depends on the size of the perforations 17, 18 and on the tangential speed of the perforations (due to the rotation of the cage 3 and of the part of the hollow shaft 2 of which it is integral). The larger the perforations 17, 18, the larger the size of the droplets passing through the perforations 17, 18. In addition, the distance between the axis of rotation of the hollow shaft and the perforated side walls of the outermost cage 16 has a direct impact on the size of the droplets created. The further out of the hollow shaft (the further away in distance) you go, the more the tangential velocity increases and the smaller the liquid droplets are. In other words, to reduce the size of the droplets, either the speed of rotation is increased or the outside diameter of the cage is increased.

The example illustrated in Figure 3 or Figure 4 shows two concentric side walls 15, 16 in the spray cage 3. Spacers 10 may be present on one or the other of the concentric side walls or on both. , to secure the two bases 7, 8. Each side wall 15, 16 comprises perforations 17, 18 can be different or identical, the size of the orifice is identical, but from one side wall to another, the size d The orifice of the perforations 17, 18 is different. A first perforated inner wall 15 and a second perforated outer wall 16 are arranged concentrically to allow the passage of liquid from the hollow shaft 2 through the first (inner) wall 15 and then through the first (inner) perforated wall 15. through the second (outer) perforated wall 16. This has the advantage that the droplets passing through the second perforated wall 16 are already cut by the first perforated wall 15. This allows an even smaller distribution and droplet size. Preferably, the size of the perforations 17, 18 and the arrangement (especially the distance from the X axis, without however being limited thereto) of the two perforated walls 15,16 are intended to allow the droplets created by the first perforated wall 15 to be larger in size than the droplets created by the second perforated wall 16. This allows the atomizer 1 to reduce the size of the droplets gradually. It is also possible to use only one perforated wall 15 or more than two perforated walls 16. Preferably, the perforated wall (s) comprise a plurality of perforations 17, 18. The plurality of perforations 17, 18 of the same perforated wall are used. † preferably the same size and / or the same distance from the axis of rotation X of the hollow shaft 2. But the series of perforations 17 of the same perforated wall 15 can also have different sizes and / or different distances per relative to the axis of rotation X of the hollow shaft 2. Preferably, the perforated wall 16 is a grid in which the meshes form the perforations 18. Preferably, each perforated wall of said series of perforated walls is arranged concentrically by relative to the axis of rotation X of the hollow shaft 2 and / or relative to another perforated wall, not shown. Preferably, the first perforated wall 15, the second perforated wall 16 and / or at least one perforated wall are preferably arranged parallel to the first axis and / or to (the axis of rotation of) the hollow shaft 2 and / or or relating to another perforated wall of said series of perforated walls. It is possible to arrange each perforated wall of said series of perforated walls (for example conical) around the first axis and / or around (the axis of rotation of) the hollow shaft so that the distance of the perforations increases in the first direction. Preferably, the distance of the perforations (of the same perforated wall) for the same axial position is identical around the hollow shaft. The distance of the perforations (from the second perforated wall) to the axis of rotation of the hollow shaft is preferably greater than 2 centimeters (cm), preferably greater than 4 cm, preferably greater than 5 cm, preferably greater than 6 cm. The distance of the perforations (from the second perforated wall) to the axis of rotation of the hollow shaft is preferably less than 20 cm, preferably less than 15 cm, preferably less than 10 cm, preferably less than 9 cm, preferably less at 8 cm.

The spray cage 3 preferably has a cylindrical shape. The axis of the cylinder preferably corresponds to the axis of rotation of the spray cage 3. The section perpendicular to the axis of the cylinder is preferably circular, but other shapes are possible. The cylinder is preferably a straight cylinder.

The spray cage 3 preferably comprises a first axial wall (first base of the cylinder) and a second axial wall (second base of the cylinder) between which at least one perforated side wall is arranged. Preferably, the two axial walls are connected to the perforated wall (s). The first axial wall and / or the second axial wall is / are preferably circular.

If the spray cage has been preferably defined with a substantially cylindrical shape, it goes without saying that any closed shape forcing the liquid through the perforations to leave the hollow shaft or the cage is suitable. For example, any type of prism is possible, such as a prism with a hexagonal, octagonal, decagonal, dodecagonal, ...

The spray cage is arranged on the hollow shaft such that the spray cage 3 rotates with the hollow shaft. The spray cage can be attached to the hollow shaft or can be formed integrally with the hollow shaft. In this example, the cage is fixed on G hollow shaft using a screwing system. A screw screwed into the hollow shaft holds the spray cage in position. The screw also tightly closes the second end of the hollow shaft so that the liquid only exits laterally first through the hollow shaft and then through the spray cage. Another possibility will be to fix the cage using pre-existing notches on the shaft or by welding, gluing.

The hollow shaft 2 extends through the spray cage. Preferably, the two axial walls of the spray cage are † fixed to the hollow shaft. However, it is also possible to fix the spray cage only on one of the axial walls.

The liquid to be sprayed is preferably water, but it is also possible to spray other liquids.

Preferably, the size of the droplets created by the atomizer is preferably configurable between a maximum diameter and a minimum diameter. The droplet size can preferably be configured by the rotational speed of the hollow shaft. The atomizer is preferably arranged to create droplets with a maximum diameter of less than 1 millimeter, preferably less than 500 micrometers, preferably less than 400 micrometers, preferably less than 300 micrometers, preferably less than 100 micrometers, preferably less than 50 micrometers, preferably less than 50 micrometers, preferably less than 50 micrometers. less than 30 micrometers. The atomizer is preferably arranged to create droplets with a minimum diameter greater than 0.1 micrometer, preferably greater than 1 micrometer, preferably greater than 5 micrometers, preferably greater than 10 micrometers. The droplets created by the atomizer are also called microgou †† ele †† es. The name atomizer does not mean that the size of the droplets must be the size of an atom or a molecule of this liquid. Depending on the application, the size of the desired droplets varies. For humidification, the gap of the desired droplets is generally smaller than for the removal of dust, for example of the order of about twenty micrometers. For the removal of dust, the size of the droplets created preferably corresponds to the size of the dust particles in the air, for example of the order of 200 micrometers.

Preferably, the atomizer is arranged to spray a liquid flow rate greater than 10 liters per hour, preferably greater than 50 liters per hour, preferably greater than 100 liters per hour, preferably greater than 200 liters per hour, preferably greater than 300 liters per hour, preferably greater than 400 liters per hour, preferably greater than 600 liters per hour, preferably greater than 800 liters per hour, preferably greater than 1000 liters per hour.

The spray cage can have variations such as mesh size, number of cage screens, cage dimensions. Said spray cage comprising at least one perforated grid level, may have an equivalent diameter over the entire width of the cage or may be of any closed shape forcing the liquid through the perforations to leave the hollow shaft or the cage , such as conical shape.

It is of course understood that the present invention is in no way limited to the embodiments described above and that many modifications can be made thereto without departing from the scope of the appended claims.

Claims

1. Atomizer (1) for spraying a liquid to be sprayed comprising: - means for supplying (6) said liquid to be sprayed, provided with an outlet for said liquid to be sprayed;

- a rotating means (4) coupled to a shaft (2), the rotating means (4) being arranged to rotate the shaft (2), the rotating means (4) is † a motor with a motor shaft which rotates about an axis of rotation of the motor;

- a spray cage (3) provided with perforations (17, 18) arranged to spray said liquid in droplets into the air, the spray cage (3) being integral with at least part of said shaft (2);

- said shaft (2) comprises at least one hollow shaft section (2) for passing liquid between said supply means (6) of said liquid to be sprayed to said spray cage (3) e † said outlet for said liquid to spray; characterized in that the shaft (2) is arranged coaxially with the axis of rotation of the motor.

2. Atomizer (1) according to claim 1 wherein said at least one hollow shaft section (2) for passing liquid extends along the length of the shaft (2).

3. Atomizer (1) according to claims 1 or 2, wherein a side wall (13) of said at least one hollow shaft section (2) is perforated with a series of perforations to allow an outlet of said liquid. the shaft (2) in the spray cage (3).

4. Atomizer (1) according to claim 3, wherein said series of perforations (5) of the side wall (13) of the perforated shaft. comprises at least perforations of different orientations to allow the exit of said liquid to be sprayed from said shaft (2) in different directions of the spray cage (3).

Atomizer (1) according to claim 3 or 4, wherein each x perforation (5) of said series of shaft perforations (2) comprises an outlet section having an area T _x with x representing an integer. , and wherein the sum of the areas Ti to Tx is greater than the cross section of said shaft (2).

6. Atomizer (1) according to any one of claims 1 to 5, wherein said spray cage (3) comprises a series of concentric side walls (15, 16).

7. Atomizer (1) according to claim 6, wherein at least part of said perforations (17, 18) of said spray cage (3) are present on one or more side walls (15, 16) concentric of the series of concentric side walls.

8. Atomizer (1) according to claim 6 or claim 7, wherein a first side wall (15) of said series of side walls of said spray cage (3) has a first plurality of perforations (17) and a second. side wall (16) of said series of side walls of said spray cage (3), concentric with the first side wall (15) has a second plurality of perforations (18), and wherein each perforation of said first plurality of perforations (17) has an outlet section Si and each perforation of said second plurality of perforations (18) has an outlet section S2 different from the outlet section Si.

9. Atomizer (1) according to claim 6 or claim 7, wherein a first side wall (15) of said series of side walls of said spray cage (3) has a first plurality of perforations (17) and a second. side wall (16) of said series of side walls of said spray cage (3), concentric with the first side wall (15) has a second plurality of perforations (18), e † in which each perforation (17) of said first plurality of perforations (17) has an outlet section Si and each perforation (18) of said second plurality of perforations (18) has an outlet section S2 equal to the outlet section Si.

10. Atomizer (1) according to any one of claims 6 to 9, wherein said perforated side wall (15, 16) is a grid.

11. Atomizer (1) according to one of claims 1 to 10, wherein the rotating means (4) is an electric motor.

12. Atomizer (1) according to one of claims 1 to 11, wherein the shaft (2) is a shaft passing through said motor (4).

13. Atomizer (1) according to any one of claims 1 to 12, wherein one end (11) of said shaft (2), opposite one end (12) of the shaft terminating in the spray cage (3) , preferably in the center thereof, is † connected to an inlet for the liquid to be sprayed (6).

14. Atomizer (1) according to one of claims 1 to 13, wherein said shaft (2) comprises a first shaft part (2) e † a second shaft part (2), said first shaft part. (2) being coupled to said rotating means (4) to be rotated by the rotating means (4) at a rotational speed vi while said second shaft part (2) forms at least there a shaft part (2) integral with said spray cage (3), said first shaft part (2) e † said second shaft part (2) being connected together by a coupling element.

15. An atomizer (1) according to claim 14, wherein said coupling element is a differential element arranged for giving said second shaft part (2) a speed of rotation V2 different from vi.

16. Atomizer (1) according to claim 15, wherein the second part comprises said series of perforations (5) to allow an exit of said liquid from the shaft (2) into the spray cage (3).

17. Atomizer (1) according to one of claims 1 to 16, wherein said shaft (2) is the motor shaft.

18. Atomizer (1) according to one of claims 1 to 17, wherein said shaft (2) is held by the bearing (19) of the motor.

19. Use of an atomizer (1) according to one of the preceding claims, for removing dust, for humidifying the air, for spraying an active product or for adiabatic cooling.

20. A method of atomizing a liquid to be sprayed, comprising the following steps:

- supplying a liquid to be sprayed at one end of at least part of a hollow shaft (2),

- rotation by a motor (4) at a speed vi of said hollow shaft (2) and at a speed V2 of said spray cage (3) with vi and V2 which are equal or different, the motor comprises a motor shaft which rotates around an axis of rotation of the motor,

- A spraying of said liquid to be sprayed by leaving said liquid through a series of perforations (5) of said hollow shaft (2) and then by a series of perforations (17, 18) of said spray cage (3) characterized in that the 'hollow shaft (2) is arranged coaxially with the axis of rotation of the motor.

21. A method of atomizing a liquid to be atomized according to claim 20, wherein said spray cage (3) comprises a series of perforated concentric walls (15, 16) and wherein said outlet of the liquid through a series of perforations (17, 18) of said spray cage (3) comprises a passage of said liquid to be sprayed through the succession of concentric walls (15, 16).