Patent Description:
In the background art, cleaning machines capable of nebulising a liquid product by means of a compressor are known. It is possible to obtain a nebulised mixture of air and liquid product containing very fine particles of liquid product, typically about <NUM> microns in diameter or less. These machines comprise a dispensing gun adapted to mix compressed air and the liquid product to obtain nebulisation. Liquid droplets are created by the mechanical action of compressed air striking against a liquid stream, generating liquid particles with the appearance of very small droplets.

Disadvantageously, the compressor is heavy, energy-intensive and occupies a large volume.

Cleaning machines also exist on the market, with or without a compressor, provided with a hydraulic pump whose pressure allows to nebulise a liquid into very fine particles. The pump pushes the liquid into a suitable circuit which ends with one or more nozzles for nebulisation. By using suitable pressure and sufficiently small nozzles, it is possible to nebulise the liquid into fine particles, e.g., with a diameter of <NUM> microns or less. The hydraulic pump pressurises the liquid to a pressure between <NUM> and <NUM> bar, for example, and the machine is provided with a nebulising gun with a suitable nozzle. Liquid droplets are obtained by forcing a liquid through very small holes in suitable nebulising nozzles, which is made possible by the pressure exerted by a suitable hydraulic pump. The diameter of the particles decreases with increasing pump pressure and decreasing nozzle section. To obtain small droplets (e.g., with a diameter of the order of <NUM> microns or less) it is necessary to have fairly high pressures (generally at least around <NUM>-<NUM> bar) which require an expensive pump and disadvantageously small nozzles, which are likely to become clogged over time by limescale or impurities contained in the liquid. Disadvantageously, the hydraulic pump is heavy, occupies a large volume and is energy-intensive.

In all the cleaning machines of the background art which are provided with at least one suction motor, it is evident that the air sucked by the motor and which is removed from a dirt container exits the motor itself and is reintroduced into the environment, possibly passing through filters, but without disadvantageously using it for other purposes.

Disadvantageously, the cleaning machines of the background art perform the nebulisation function by virtue of a suitable air compressor or a hydraulic pump. In fact, the nebulisation of a liquid in very fine particles can be performed by acting on the liquid by means of the pressure exerted by an air compressor, or by means of the pressure exerted by a hydraulic pump. A cleaning machine according to the preamble of claim <NUM> is already known e.g. from <CIT>.

The object of the present invention is to obtain a cleaning machine comprising a function for nebulising a liquid product, for example sanitiser, which is low in cost and small in size.

In accordance with the invention, such an object is achieved with a cleaning machine according to claim <NUM>.

Other features are provided in the dependent claims.

The features and advantages of the present invention will be more apparent from the following description, which is to be understood as exemplifying and not limiting, with reference to the appended schematic drawings, in which:.

With reference to the above figures, a cleaning machine <NUM> is shown which does not comprise any compressors.

The cleaning machine <NUM> is comprised in the following types: domestic, professional or industrial vacuum cleaners or wet vacuums, provided with at least one suction motor <NUM>; "injection-extraction" machines, provided with at least one suction motor <NUM> and a circuit for spraying liquid and cleaning accessories, connected to the machine by means of special flexible connection tubes; cleaning and sanitising machines functioning with the "spray-rinse-suction" or "foam-rinse-suction" systems, provided with a circuit for spraying product in the form of foam or liquid and at least one suction motor <NUM>; self-contained machines, suitable for carpeted or non-carpeted surfaces, provided with at least one suction motor <NUM> and a washing unit placed directly below the machine body, possibly with one or more rotating brushes; floor cleaning machines, specific for hard floors, provided with at least one suction motor <NUM> and a washing unit placed directly below the machine body, possibly provided with one or more rotating brushes; different types of cleaning machines, as long as they are provided with at least one suction motor <NUM>.

The present invention relates to the possibility of obtaining said cleaning machine <NUM> which nebulises a liquid product in very fine particles, without the machine using an air compressor for such a purpose.

In all the embodiments, the machine <NUM> according to the present invention allows the nebulised liquid to be sprayed through a manual dispenser <NUM> such as a dispensing gun, which allows the operator to direct the flow in the desired manner.

Preferably, the machine <NUM> does not even comprise a hydraulic pump <NUM> as shown in <FIG> and <FIG> according to a first embodiment.

As shown in <FIG>, the cleaning machine <NUM> comprises a nebuliser device <NUM> for nebulising a liquid product <NUM>, a tank <NUM> containing said liquid product <NUM>, in which said liquid product <NUM> is maintained in a liquid state inside said tank <NUM>, an intake portion <NUM> comprising at least one waste air vent <NUM>.

The liquid product <NUM> is a cleaning or sanitising product or simply a liquid which is to be nebulised for cleaning.

Said nebuliser device <NUM> comprises a dispenser <NUM> for dispensing said liquid product <NUM>, a first connecting duct <NUM> which connects in fluid communication said tank <NUM> with said dispenser <NUM>, a second connecting duct <NUM> which connects in air-flow communication said at least one waste air vent <NUM> of said intake part <NUM> with said dispenser <NUM>.

As shown in particular in <FIG> and <FIG>, said dispenser <NUM> comprises a hollow body <NUM> comprising an inner cavity <NUM> connected in air-flow communication with said second duct <NUM>, a dispensing tube <NUM> which is connected in fluid communication with said first duct <NUM>, in which at least one portion of said dispensing tube <NUM> projects inside at least one portion of said inner cavity <NUM>. The liquid product <NUM> is forced into the first connecting duct <NUM> at a pressure higher than atmospheric pressure.

A space forming a nebulisation area <NUM> is provided between an outlet pass-through opening of said dispensing tube <NUM> and an outlet pass-through opening of said inner cavity <NUM>, in which said nebulisation area <NUM> is arranged inside said inner cavity <NUM>.

It should be noted that the machine <NUM> advantageously does not comprise any compressor which is adapted to increase the air pressure before introducing it into the second duct <NUM> which connects in air-flow communication the intake part <NUM> of the machine <NUM> with the dispenser <NUM> of the machine <NUM>.

Even more preferably and as shown in particular in <FIG> and <FIG>, said inner cavity <NUM> comprises at least one hollow cylindrical portion <NUM> comprising inner walls <NUM> of said hollow body <NUM>.

In the first example shown in <FIG>, the inner cavity <NUM> comprises only one hollow cylindrical portion <NUM>.

In the second embodiment shown in <FIG>, the inner cavity <NUM> consists entirely of the hollow cylindrical portion <NUM>.

Said dispensing tube <NUM> comprises at least one hollow cylindrical portion <NUM>, in which said at least one hollow cylindrical portion <NUM> of said dispensing tube <NUM> is arranged inside said at least one hollow cylindrical portion <NUM> of said inner cavity <NUM>.

In the first embodiment shown in <FIG>, the dispensing tube <NUM> comprises only one hollow cylindrical portion <NUM>.

In the second embodiment shown in <FIG>, the dispensing tube <NUM> consists entirely of the hollow cylindrical portion <NUM>.

The second embodiment shown in <FIG> shows that the inner cavity <NUM> is a T-connection also comprising an inlet channel connected by air-flow with the second connecting duct <NUM>.

Even more preferably and advantageously in order to direct and increase the air velocity in the nebulisation area <NUM>, said inner cavity <NUM> comprises at least one hollow portion in truncated-cone shape <NUM>.

Even more preferably said dispensing tube <NUM> comprises a hollow portion in truncated-cone shape <NUM>.

Said at least one hollow portion in truncated-cone shape <NUM> of said inner cavity <NUM> comprises an open greater geometrical base forming a first pass-through opening <NUM> with a greater width which matches with a width of said at least one hollow cylindrical portion <NUM> of said inner cavity <NUM> and an open smaller geometrical base forming a second pass-through opening <NUM> with a smaller width which is said outlet pass-through opening of said hollow body <NUM> of said dispenser <NUM>.

Said hollow portion in truncated-cone shape <NUM> of said dispensing tube <NUM> comprises an open greater geometrical base forming a first pass-through opening <NUM> with a greater width which matches with a width of said at least one hollow cylindrical portion <NUM> of said dispensing tube <NUM> and an open smaller geometrical base forming a second pass-through opening <NUM> with a smaller width which is said outlet pass-through opening of said dispensing tube <NUM>.

Even more preferably and advantageously to create a uniform flow of both air and fluid, said at least one hollow cylindrical portion <NUM> of said inner cavity <NUM> comprises a circular transversal section, furthermore said one hollow cylindrical portion <NUM> of said dispensing tube <NUM> comprises a circular transversal section, furthermore it is provided that respective geometric axes of symmetry of each of said hollow cylindrical portions <NUM>, <NUM> are congruent.

As shown in <FIG> and <FIG>, the first embodiment provides that there is no hydraulic pump <NUM> adapted to increase the pressure of the liquid product <NUM>. The liquid product <NUM> is maintained at a pressure higher than atmospheric pressure inside the tank <NUM> by means of an air outlet duct <NUM>. The outlet duct <NUM> comprises a hollow upper end in air-flow communication with the inner cavity <NUM> and a lower end in air-flow communication with the tank <NUM>. Said inner cavity <NUM> comprises said outlet duct <NUM>. The lower end of the outlet duct <NUM> ends outside the liquid product <NUM> in liquid state contained in the tank <NUM>, so that the air from the outlet duct <NUM> is introduced into the space of the tank <NUM> comprising air. The upper end of the outlet duct <NUM> is arranged at a distance from the nebulisation area <NUM>.

The entry of air from the outlet duct <NUM> into the tank <NUM> causes a pressure increase of the gas contained in the tank <NUM>, increasing the internal pressure of the tank <NUM> and consequently causing the liquid product <NUM> to remain inside the tank <NUM> at a pressure higher than atmospheric pressure.

The first connecting duct <NUM> has one end which is immersed in the liquid product <NUM> contained inside the tank <NUM>.

This first embodiment is preferable, as the machine <NUM> advantageously lacks the hydraulic pump <NUM>, thereby the machine <NUM> is even less energy-intensive, even lighter and even smaller in volume.

Even more preferably, the first embodiment in <FIG> shows the possibility of providing two hollow portions in truncated-cone shape <NUM> of said at least one hollow portion in truncated-cone shape <NUM>, in which a first hollow portion in truncated-cone shape <NUM> gradually reduces a width of the inner cavity <NUM> to a first width, in which a second hollow portion in truncated-cone shape <NUM> gradually reduces said first width of the inner cavity <NUM> to a second width of a smaller width than the first width, so that the nebulisation area <NUM> comprises a first zone <NUM> and a second zone <NUM>. Said first zone <NUM> is wider with respect to the second zone <NUM>. Said first zone <NUM> of the nebulisation area <NUM> provides that the liquid product <NUM> is introduced by the dispensing tube <NUM> into the inner cavity <NUM> creating a mixture with the air contained therein. Said second zone <NUM> of the nebulisation area <NUM> advantageously increases a velocity of the nebulised mixture prior to being released into the atmosphere through the outlet pass-through opening of said inner cavity <NUM>. The outlet pass-through opening of said inner cavity <NUM> is the second pass-through opening <NUM> of the second hollow portion in truncated-cone shape <NUM>.

As instead shown in <FIG> and <FIG>, the second example provides that the machine <NUM> comprises a hydraulic pump <NUM>. Said hydraulic pump <NUM> is connected to said tank <NUM> and to said first duct <NUM>, in which said hydraulic pump <NUM> keeps said liquid product <NUM> under pressure at a pressure higher than said atmospheric pressure. Said hydraulic pump <NUM> advantageously allows to continuously supply the dispensing device <NUM>, so as to have a virtually unlimited spray autonomy of the nebulised mixture.

As shown in particular in <FIG>, said dispenser <NUM> comprises at least one actuator <NUM> mounted between said first duct <NUM> and said dispensing tube <NUM>. Said actuator <NUM> controls a fluid flow rate of said liquid product <NUM>. For example, said actuator <NUM> is a lever acting on a valve <NUM> arranged between said first duct <NUM> and said dispensing tube <NUM> to regulate the inlet flow between said first duct <NUM> and said dispensing tube <NUM>.

The dispensing device <NUM> is in the form of a gun, as shown in <FIG> to advantageously facilitate a directing of spray towards an area to be cleaned by an operator handling said machine <NUM>.

As shown in <FIG>, the first embodiment is advantageously smaller and allows to provide, for example, that the machine <NUM> comprises a container <NUM> for sucking dust or liquids or waste which can be worn by means of a harness <NUM> by the operator. The harness <NUM> comprises at least two shoulder straps <NUM> to ensure that the container <NUM> can be worn on the operator's shoulders as if it were a rucksack and that the operator can direct the nebulisation flow while holding the nebuliser device <NUM>. In this first embodiment it can be noted that the tank <NUM> is mounted with the dispenser <NUM> and the intake part <NUM> is mounted with the container <NUM>.

It is further possible to provide that a portion of the container <NUM> facing the operator's shoulders may have a padded surface <NUM> forming part of the harness <NUM>.

As shown in <FIG> and <FIG>, the machine <NUM> according to the second embodiment instead mounts together the tank <NUM> and the container <NUM> for the sucked waste to form a carrier unit <NUM>. Providing also for the presence of the hydraulic pump <NUM>, it is provided that the carrier unit <NUM> is provided with wheels <NUM> to facilitate transport by the operator. The operator holds the dispensing device <NUM> and suitably directs it towards the zones to be nebulised.

As shown in <FIG>, it should be noted that the second duct <NUM> comprises an end which opens into the inner cavity <NUM> at a distance from the nebulisation area <NUM> so as to facilitate the supply of air to the nebulisation area <NUM>.

As shown in <FIG>, it should be noted that the portion in truncated-cone shape <NUM> is connected to the cylindrical portion <NUM> by means of a ring nut <NUM>.

As shown in <FIG>, the intake part <NUM> of the machine <NUM> always comprises at least one suction motor <NUM>, which is used to suction dust or liquids, which are recovered inside at least said container <NUM> which is a dirt recovery tank.

During the dirt recovery operations, the container <NUM> is kept under vacuum by virtue of the action of the suction motor <NUM>, which removes air from the container <NUM>, keeping it always under vacuum. The container <NUM> is put in communication with the outside by means of connection tubes and suitable suction nozzles or accessories which come into contact with the surfaces to be cleaned and which serve to suction dust or liquids inside the recovery tank.

When the machine <NUM> is of the vacuum cleaner type, the container <NUM> may be provided with a bag for containing dust. In any event, both for vacuum cleaners and for the other types of cleaning machines <NUM> mentioned above, there may be filters interposed between the suction motor <NUM> and the container <NUM>, which serve to prevent fine dust from being sucked directly into the motor <NUM> of the intake part <NUM>.

As shown in <FIG>, the vacuum cleaner <NUM> provides that the suction motor <NUM> of the intake part <NUM> is enclosed in a container <NUM> formed by suitably shaped components. The container <NUM> has the purpose of conveying the air output from the motor <NUM> towards the second duct <NUM> by means of said at least one waste air vent <NUM>, in order to advantageously use it for nebulisation.

As shown in <FIG>, the suction motor <NUM> is housed inside the container <NUM>. The container <NUM> comprises at least one inlet pass-through opening <NUM> and at least one outlet pass-through opening <NUM> which is said at least one waste air vent <NUM>.

The inlet pass-through opening <NUM> channels air from the dirt container <NUM> to the motor <NUM>, while the outlet pass-through opening <NUM> channels the vent air towards the second duct <NUM>. The container <NUM> comprises a bearing surface which may be the same load-bearing structure of the body of the machine <NUM> as shown in <FIG>, or a structure itself rigidly fixed with the container <NUM> as shown in <FIG> and <FIG>.

As shown in <FIG> even more preferably, vibration damping and/or sealing gaskets <NUM> are provided between the container <NUM> and the motor <NUM> which allow to attenuate vibrations transmitted from the motor <NUM> to the body of the machine <NUM> during the operation thereof. Other means could be used instead of gaskets, such as adhesives or sealants of various kinds.

As shown in <FIG> and <FIG>, most of the waste air sucked from the dirt container <NUM> by the motor <NUM> of the intake part <NUM> exits from said outlet pass-through opening <NUM>.

As shown in <FIG>, the outlet pass-through opening <NUM> is arranged laterally to the motor <NUM> and an opening flange <NUM> is connected with said second connecting duct <NUM>.

As shown in <FIG>, the container <NUM> comprises an upper lateral portion <NUM>, a lower lateral load-bearing portion <NUM> comprising a support surface for the motor <NUM>, an upper portion <NUM> comprising the inlet pass-through opening <NUM> connected in air-flow communication with said dirt container <NUM>, a disc <NUM> mounted above the support surface which supports the motor <NUM> and is supported by the lower lateral load-bearing portion <NUM>. The upper lateral portion <NUM> comprises a flange which opens into the outlet pass-through opening <NUM> which is the waste air vent <NUM>.

As shown in <FIG>, the container <NUM> comprises a lid-shaped structure <NUM> in place of the upper portion <NUM>. The lid-shaped structure <NUM> comprises an upper portion comprising the inlet pass-through opening <NUM>. The lid-shaped structure <NUM> is supported by the disc <NUM> and comprises a lateral wall <NUM> comprising an opening flange <NUM> which reduces a transversal section width of the outlet pass-through opening <NUM> which is the air vent <NUM> allowing the opening flange <NUM> to be connected directly with the second duct <NUM>.

Preferably, the outlet pass-through opening <NUM> is obtained from the opening flange <NUM> as shown in <FIG>.

More generally, the machine <NUM> comprises the dirt container <NUM> and said intake part <NUM> comprises at least one motor <NUM> adapted to suction air from said dirt container <NUM>, in which said at least one motor <NUM> is housed inside the container <NUM> of the intake part <NUM>. Said container <NUM> comprises at least one inlet pass-through opening <NUM> for passing air from said dirt container <NUM> towards said at least one motor <NUM> and said at least one outlet pass-through opening <NUM>, in which said at least one outlet pass-through opening <NUM> is said at least one waste air vent <NUM>.

Said output pass-through opening <NUM> is arranged laterally to said at least one motor <NUM> as shown in <FIG> and <FIG>.

As shown in <FIG> said outlet pass-through opening <NUM> may be arranged below said at least one motor <NUM> and said at least one waste air vent <NUM>.

As shown in <FIG> the container <NUM> is mounted with a lower wall of the dirt container <NUM>. This lower wall of the dirt container <NUM> comprises a flanged outlet towards the inside of the dirt container <NUM>. Said flanged outlet forms the inlet opening <NUM> of the container <NUM>. Damping elements <NUM> form a pass-through disc which allows air to enter from the dirt container <NUM> to the container <NUM>. The first upper lateral portion <NUM> is mounted with the lower wall of the dirt container <NUM> by means of a flanged portion. The lower lateral load-bearing portion <NUM> comprises a lower portion which opens with a flange which is said an outlet pass-through opening <NUM> which is the waste air vent <NUM> connected with the second duct <NUM>.

Advantageously, the container <NUM> of <FIG> allows to direct most of the waste air from the dirt container <NUM> to the second duct <NUM>.

Preferably as shown in <FIG> and <FIG> it is further provided that the container <NUM> comprises at least one safety pass-through hole <NUM> allowing a small amount of air to exit outside the container <NUM>. The safety pass-through vent hole <NUM> is smaller with respect to the outlet pass-through opening <NUM>.

As shown in <FIG> and <FIG>, the safety pass-through vent hole is hollowed out in the disc <NUM>.

Alternatively, as shown in <FIG>, the pass-through vent hole <NUM> is arranged near the outlet pass-through opening <NUM> and is hollowed out in the lower portion of the lower lateral load-bearing wall <NUM>. The safety pass-through vent hole <NUM> puts in communication the inside of the container <NUM> with the outside of the container <NUM>.

Said pass-through vent hole <NUM> is particularly useful for ensuring an air vent of the container <NUM> if abnormal operation prevents air from freely flowing through the outlet pass-through hole <NUM> and thus to the second duct <NUM>.

The outlet pass-through opening <NUM> is sized to allow most of the air sucked by the motor freely flow through the second duct <NUM>.

For example, the safety pass-through vent hole <NUM> may have a section equal to <NUM>/6th of the section of the second duct <NUM>. Alternatively, other dimensions are possible, all of which are adapted to ensure a sufficient vent.

In <FIG>, the pass-through vent hole <NUM> is free.

The above-described invention may provide the presence of further connecting or filtering components useful for conveying or filtering the air exiting from said at least one outlet opening <NUM>, before it enters the second duct <NUM>.

Advantageously, the cleaning machine <NUM> comprises a liquid nebulisation function, is low cost and small in size.

Advantageously, the cleaning machine <NUM> is capable of both cleaning and nebulising a liquid in the form of a mixture of air and very small liquid droplets.

Advantageously, the mixture of liquid and air generated by the machine <NUM> can be sprayed in closed environments with the aim of diffusing a liquid, e.g., sanitiser, into the same.

Advantageously, the same mixture can also be directed directly onto surfaces in order to distribute a liquid product thereon in the form of a thin layer which uniformly covers the surfaces.

Advantageously, the nebulised solution allows to reach every point in the environment or on surfaces, uniformly distributing the product, in the desired amount and without waste.

Advantageously, the air coming from the machine <NUM> exerts a pressure on the liquid contained in the tank <NUM>, of the order of about <NUM> to <NUM> bar. This pressure allows the liquid product <NUM> to rise through the rising channel, which is the second duct <NUM>.

Advantageously, a nebulisation jet of the air mixture to the liquid product <NUM> comprises very small particles which take the form of very fine droplets. Using air jets of <NUM>-<NUM> litres per second and by sizing the liquid and air passage sections and the nebulisation area <NUM> it is possible to obtain a very fine mixture jet. Such a jet can reach a distance of <NUM>-<NUM> metres from the operator. The amount of nebulised liquid in the mixture jet is adjustable by virtue of a flow regulator which intercepts the liquid passage.

By appropriately sizing the sections of the inner cavity <NUM> and the dispensing tube <NUM>, it is possible for the liquid to be suctioned by Venturi effect from the tank <NUM> thereof.

Advantageously, if the cleaning machine <NUM> is of the vacuum cleaner or wet vacuum type, it can operate even if it does not contain in the machine body any tank to contain the liquid <NUM>, nor any pump <NUM> and a hydraulic circuit to push the liquid to the nebuliser device <NUM>.

Alternatively, it is possible to provide that the cleaning machine <NUM> comprises a hydraulic pump <NUM>, in which the hydraulic pump <NUM> continuously feeds the spray gun <NUM>, so as to have a virtually unlimited spray autonomy during nebulisation.

Alternatively, it is possible to provide other geometric shapes of the inner cavity <NUM> and the dispensing tube <NUM>, for example it is possible to provide for them to have truncated-cone shape.

Alternatively said at least one hollow cylindrical portion <NUM> of said inner cavity <NUM> comprises an elliptical transversal section, furthermore said one hollow cylindrical portion <NUM> of said dispensing tube <NUM> comprises an elliptical transversal section.

Alternatively, it is provided that the respective geometric axes of symmetry of each of the hollow cylindrical portions <NUM>, <NUM> are not congruent.

Alternatively, it is provided that the respective geometric axes of symmetry of each of the hollow cylindrical portions <NUM>, <NUM> are parallel to each other.

Alternatively, if the motor <NUM> is mounted by means of locking flanges integrated in the load-bearing structure thereof, such as perforated tabs, at least one part of the fixing of the container <NUM> could be replaced by simple fixing screws. In each case, the motor <NUM> is fixed with respect to the body of the machine <NUM>.

Alternatively, the safety pass-through vent hole <NUM> may be replaced by several holes or slots of any shape. The pass-through vent hole <NUM> may have a free passage, or a valve, or a normally closed passage by means of a sprung plug which opens the passage section of the pass-through vent hole <NUM> only when the pressure inside the container <NUM> exceeds a safety value, upon the occurrence of an obstruction along the second duct <NUM>. The presence of the pass-through vent hole <NUM> also makes it advantageous not to overly raise the temperature inside the container <NUM>.

Alternatively, the pass-through vent hole <NUM> may be arranged differently, for example the pass-through vent hole <NUM> could be located near the second duct <NUM> or above the second duct <NUM>, or near the body of the machine <NUM>.

Alternatively, it may be provided that the pass-through vent hole <NUM> may be arranged at any point on the walls of the container <NUM>.

Alternatively, a pass-through vent hole <NUM> may be provided near the nebulisation area <NUM>.

Alternatively, as shown in <FIG>, the machine <NUM> may use one or more suction motors <NUM>. In the case of several motors <NUM>, these can be cascaded or connected in parallel. For parallel motors <NUM>, each motor <NUM> is connected to the dirt container <NUM> so as to suction air from the dirt container <NUM>.

Alternatively, as shown in <FIG>, one of the motors <NUM> could be preferentially used to supply the air required for nebulisation. In this case said at least one outlet pass-through opening <NUM> receives air from a specific motor <NUM> only.

Alternatively, each motor may contribute to the generation of the air required for nebulisation. In this case the container <NUM> delimits said one or more motors <NUM>.

Alternatively, said liquid product <NUM> is pushed into the first connecting duct <NUM> at a pressure lower than an atmospheric pressure and is maintained in a liquid state inside said tank <NUM>. In this case, air is extracted from the tank <NUM> by Venturi effect.

Alternatively, said hollow cylindrical portion <NUM> of said inner cavity <NUM> comprises a prismatic transversal section.

Alternatively said at least one hollow cylindrical portion <NUM> of said dispensing tube <NUM> comprises a prismatic transversal section.

Alternatively as shown in <FIG> it is provided that said at least one hollow portion in truncated-cone shape <NUM> may comprise a tubular portion <NUM> which extends the nebulisation area <NUM>. Hollow portion of truncated cone-shape <NUM> means that at least one portion of this hollow portion comprises a portion of truncated cone-shape <NUM>, but other portions thereof may be tubular such as the tubular portion <NUM> shown in <FIG>.

Alternatively, as shown in <FIG>, the nebulisation area <NUM> is arranged at a mouth of the outlet pass-through opening of said dispensing tube <NUM> and at a mouth of the outlet pass-through opening of said inner cavity <NUM>, in which said nebulisation area <NUM> is provided outside the inner cavity <NUM> and outside the nebuliser device <NUM>.

Alternatively, said outlet duct <NUM> comprises a hollow upper end in air-flow communication directly with the second duct <NUM> and a lower end in air-flow communication with the tank <NUM>.

Alternatively as shown in <FIG> said machine <NUM> comprises an air outlet duct <NUM> comprising one end connected in air-flow communication with said second duct <NUM> and another end which is connected in air-flow communication with said tank <NUM>. This alternative advantageously does not have the hydraulic pump <NUM>, since the air pressure conveyed by the outlet duct <NUM> is conveyed inside the tank <NUM> to increase the pressure of the liquid <NUM>.

Alternatively as shown in <FIG> said outlet duct <NUM> is a tube outside the body of the dispenser <NUM>. More in general, said nebuliser device <NUM> comprises the air outlet duct <NUM> comprising one end connected in air-flow communication with said inner cavity <NUM> and another end which is connected in air-flow communication with said tank <NUM>.

Alternatively, the lower end of the outlet duct <NUM> ends in any point in the tank <NUM> which allows air to enter the tank <NUM>.

Alternatively, said outlet pass-through opening <NUM> may be arranged at any point in the container <NUM> containing the motor <NUM>.

Alternatively, as shown in <FIG> said dispensing tube <NUM> is outside said inner cavity <NUM>, in fact it is sufficient that the space forming the nebulisation area <NUM> is arranged at the mouth of the outlet pass-through opening of said dispensing tube <NUM> and at the mouth of the outlet pass-through opening of said inner cavity <NUM>.

Claim 1:
Cleaning machine (<NUM>) comprising
a nebuliser device (<NUM>) for nebulising a liquid product (<NUM>),
a tank (<NUM>) which contains said liquid product (<NUM>),
an intake part (<NUM>) which comprises at least one vent for waste air (<NUM>),
wherein said nebuliser device (<NUM>) comprises
a dispenser (<NUM>) for dispensing said liquid product (<NUM>),
a first connecting duct (<NUM>) which connects in fluid communication said tank (<NUM>) with said dispenser (<NUM>),
a second duct (<NUM>) which connects in air-flow communication said at least one waste air vent (<NUM>) of said intake part (<NUM>) with said dispenser (<NUM>),
wherein said dispenser (<NUM>) comprises a hollow body (<NUM>) comprising
an inner cavity (<NUM>) connected in air-flow communication with said second duct (<NUM>),
a dispensing tube (<NUM>) connected in fluid communication with said first duct (<NUM>),
wherein a space forming a nebulisation area (<NUM>) is provided arranged at a mouth of an outlet pass-through opening of said dispensing tube (<NUM>) and at a mouth of an outlet pass-through opening of said inner cavity (<NUM>),
characterized in that
said machine (<NUM>) comprises a dirt container (<NUM>) and wherein said intake part (<NUM>) comprises at least one motor (<NUM>) adapted to intake air from said dirt container (<NUM>), said at least one motor (<NUM>) being housed inside a container (<NUM>) of said intake part (<NUM>), wherein said container (<NUM>) comprises at least one inlet pass-through opening (<NUM>) for passing air from said dirt container (<NUM>) to said at least one motor (<NUM>) and at least one outlet pass-through opening (<NUM>), wherein said at least one outlet pass-through opening (<NUM>) is said at least one waste air vent (<NUM>),
wherein said container (<NUM>) comprises a pass-through vent hole (<NUM>) of smaller size with respect to said outlet pass-through opening (<NUM>), wherein said pass-through vent hole (<NUM>) opens the container (<NUM>) to the outside.