EP2987443B1 - Cooling nozzle and suction device comprising the cooling nozzle - Google Patents

Description

The present invention relates to vacuum cleaners and more particularly to the suction devices of waste such as ash. The present invention more particularly provides a cooling tip and a suction device comprising the cooling tip.

Waste such as ash can be produced by burning fuel in fireplaces, inserts, barbecues, wood or pellet stoves, etc.

Cleaning some garbage such as ashes can be a problem. Indeed, there are already ash vacuum cleaners that can aspire ashes. These vacuum cleaners generally comprise a vacuum generating means that causes ash suction, a suction ash collector and a suction duct connected to the ash collector. But, these vacuum cleaners can only suck up these ashes when they have had time to cool so as not to damage the vacuum cleaner. Ashes, when hot, can reach temperatures of up to 250 ° C when mixed with air. They can then cause the deterioration of several parts of the vacuum cleaner such as the sheath, the filters, the engine.

The DE 215662 teaches a suction tip of dust and ashes. The tip includes a device that prevents clogging the suction nozzle by dust and ashes. However, the tip proposed by this document does not allow the problem that can pose the suction of ashes still hot.

The present invention therefore aims to overcome one or more of the disadvantages of the prior art by providing a nozzle to be able to suck ashes still hot without damaging the vacuum cleaner.

• un tube d'aspiration destiné à prolonger une gaine d'un dispositif d'aspiration, une extrémité de connexion du tube d'aspiration étant destinée à se connecter à la gaine, l'autre extrémité étant l'extrémité d'aspiration des cendres,
• un déflecteur cylindrique entourant au moins une portion du tube d'aspiration étant fixé sur la paroi externe du tube d'aspiration,
• au moins une ouverture dans la paroi du tube d'aspiration pour aspirer de l'air frais, la ou les ouvertures étant adjacentes de l'endroit où est fixé le déflecteur sur la portion du tube d'aspiration qui est entourée par le déflecteur.

To this end, the invention relates to a cooling tip characterized in that it comprises at least:

• a suction tube for extending a sheath of a suction device, a connecting end of the suction tube being adapted to connect to the sheath, the other end being the suction end of the ash,
• a cylindrical deflector surrounding at least a portion of the suction tube being fixed on the outer wall of the suction tube,
• at least one opening in the wall of the suction tube for sucking fresh air, the opening or openings being adjacent to the location where the deflector is attached to the portion of the suction tube which is surrounded by the baffle.

• un tube tronconique coaxial au tube d'aspiration, la base la plus grande du tube tronconique étant dirigée vers l'extrémité de connexion du tube d'aspiration et forme une ouverture annulaire par laquelle l'air frais alimente la ou les ouvertures d'aspiration de la paroi du tube d'aspiration,
• une partie circulaire fixant le sommet du tube tronconique à la paroi externe du tube d'aspiration.

According to another particularity, the deflector comprises at least:

• a frustoconical tube coaxial with the suction tube, the largest base of the frustoconical tube being directed towards the connection end of the suction tube and forming an annular opening through which the fresh air feeds the suction opening (s). the wall of the suction tube,
• a circular part fixing the top of the frustoconical tube to the outer wall of the suction tube.

• un tube cylindrique droit, coaxial au tube d'aspiration,
• une partie circulaire fixant le sommet du tube cylindrique droit à la paroi externe du tube d'aspiration.

According to another particularity, the deflector comprises at least:

• a straight cylindrical tube, coaxial with the suction tube,
• a circular portion fixing the top of the straight cylindrical tube to the outer wall of the suction tube.

According to another particularity, the circular portion has a section portion of a circle.

According to another feature, the circular portion has a cross section.

According to another feature, the openings are four in number regularly spaced in a plane transverse to the suction tube.

According to another feature, the opening or openings are rectangular openings whose longitudinal axes are included in a plane transverse to the suction tube.

According to another feature, the distance Ddef separating the suction end of the ashes and the deflector is in a range of 10 cm to 20 cm.

In another feature, the length Ld of the deflector is in a range of 35 mm to 55 mm.

According to another feature, the circular portion of the section of the circular portion has a radius in the range of 2 mm to 7 mm

In another feature, the connection end comprises connecting means for connecting the tip to a sheath of a suction device.

According to another feature, the baffle is detachable from the suction tube.

The invention also relates to a suction device characterized in that it comprises a vacuum generator means adapted to cause the suction of waste, a waste collector sucked by the vacuum means, a suction duct connected to the collector waste and a cooling tip according to the invention.

• la figure 1 représente une section longitudinale de l'embout selon une première configuration ;
• la figure 2 représente une vue en perspective du profil de l'embout ;
• la figure 3 représente une vue en perspective de l'embout ;
• la figure 4 représente une autre vue en perspective de l'embout ;
• la figure 5 représente une vue en perspective de l'embout coupé selon un plan longitudinal ;
• la figure 6 représente une vue de profil d'un dispositif d'aspiration muni de l'embout selon l'invention ;
• la figure 7 représente une coupe longitudinale de l'embout ;
• la figure 8 représente une section longitudinale d'un embout inefficace ;
• la figure 9 représente une section longitudinale de l'embout selon une variante de la première configuration ;
• la figure 10 représente une section longitudinale de l'embout selon une variante de la deuxième configuration ;
• la figure 11 représente une section longitudinale de l'embout avec une répartition de la température dans l'embout lors d'une aspiration de cendres chaudes.

Other features and advantages of the present invention will appear more clearly on reading the description below, made with reference to the accompanying drawings:

• the figure 1 represents a longitudinal section of the nozzle in a first configuration;
• the figure 2 represents a perspective view of the tip profile;
• the figure 3 represents a perspective view of the tip;
• the figure 4 represents another perspective view of the tip;
• the figure 5 represents a perspective view of the tip cut along a longitudinal plane;
• the figure 6 represents a side view of a suction device provided with the nozzle according to the invention;
• the figure 7 represents a longitudinal section of the tip;
• the figure 8 represents a longitudinal section of an inefficient tip;
• the figure 9 represents a longitudinal section of the nozzle according to a variant of the first configuration;
• the figure 10 represents a longitudinal section of the nozzle according to a variant of the second configuration;
• the figure 11 represents a longitudinal section of the mouthpiece with a distribution of the temperature in the mouthpiece during a suction of hot ashes.

The invention will be described with reference to the figures listed above.

The present invention is a cooling tip for suction device (8).

The tip comprises at least one suction tube (1) for extending a sheath (84) of the suction device (8). The suction tube (1) is for example cylindrical.

The diameter D of the suction tube (1) has a value small enough to filter too large waste that could cool too slowly with the tip. Thus, the diameter D of the tube has a value between 25 mm and 45 mm, preferably 28 mm or 40 mm.

A connecting end (5) of the suction tube (1) is intended to connect to the sheath (84) of the suction device (8). The other end is a suction end (4) through which the waste is sucked.

Waste such as hot ash is for example mixed with ambient air during their suction. This mixture (6) of air and ash can have a temperature of about 250 ° C.

The nozzle also comprises a cylindrical deflector (2) surrounding at least a portion of the suction tube (1). The deflector (2) is fixed on the outer wall of the suction tube (1).

According to a first configuration represented on the figure 1 , the deflector (2) comprises at least one frustoconical tube (21) coaxial with the suction tube (1). The largest base of the frustoconical tube (21) is directed towards the end (5) of connection of the suction tube (1). The frustoconical tube (21) makes an angle β with the wall of the suction tube (1). Without limitation, the angle β is equal to 10 °. The frustoconical tube thus forms an annular opening through which the fresh air feeds the suction opening of the wall of the suction tube. The frustoconical tube (21) is fixed on the outer wall of the suction tube (1) via a circular portion (22). The deflector (2) may have a generally parabolic shape. The circular portion (22) has a section portion with a radius of between 2 mm and 7 mm, preferably 5 mm.

According to a variant of the first configuration represented on the figure 9 the circular portion (22) has a cross section. The cross section makes an angle α with the wall of the suction tube. This angle α has a value greater than the angle β of the frustoconical tube.

According to a second configuration, the deflector (2) comprises at least one straight cylindrical tube (21) coaxial with the suction tube (1). The free end of the right cylindrical tube thus forms an annular opening through which the fresh air feeds the suction opening of the wall of the suction tube. The tube (21) is fixed on the outer wall of the suction tube (1) via a circular portion (22). The circular portion (22) may have a circle portion section with a radius of between 2 mm and 7 mm, preferably 5 mm in such a way that the deflector (2) has a section of generally half-U shape.

According to a variant of the second configuration represented on the figure 10 the circular portion (22) has a cross section. The cross section makes an angle α with the wall of the suction tube.

In one embodiment, the circular portion (22) and the frustoconical tube or the straight cylindrical tube are in one piece.

Without limitation, the baffle and / or the suction tube are made of a material that withstands the temperatures emitted by hot ashes. Without limitation, the material is a metallic material. In a non-limiting way, the metal is steel or an alloy such as zamak or zamak.

The distance Ddef between the baffle (2) and the suction end (4) is large enough so that the cooling air entering through the opening (s) is not overheated by the hot ashes.

The deflector (2) can be configured so that a user can grasp the tip at the deflector (2). Thus, the distance Ddef must be large enough so that the user can grasp the tip without it being burned when the ashes are sucked.

Without limitation, the distance Ddef between the deflector (2) and the end (4) suction is in a range of 10 cm to 20 cm, preferably 15 cm.

In a nonlimiting manner, the deflector has a length Ld ranging from 35 mm to 55 mm, preferably 45 mm.

In a nonlimiting manner, the deflector (2) is mounted in force on the suction tube (1). A flange located around the circular portion (22) joins the outer wall of the suction tube (1), the deflector (2) being fitted on the suction tube (1) by the suction end (4). .

At least one opening is made in the wall of the suction tube (1) to suck fresh air or, otherwise called, cooling air. The opening or openings (3) are adjacent to the place where the deflector (2) is fixed. In addition, the opening or openings (3) are formed on the portion of the suction tube (1) which is surrounded by the deflector (2). Thus, in view of the profile of the nozzle, the opening or openings (3) are hidden by the deflector (2).

The opening or openings (3) are made in such a way that the flow of air (7) entering through this or these openings (3) does not exceed the air flow (6) entering through the end (4) of suction of the mouthpiece. In addition, the number of openings is not too high not to weaken the suction tube (1).

The suction tube (1) comprises at least one opening, preferably between two and six regularly spaced openings around the suction tube (1) in a plane P transverse to the suction tube (1).

More preferably, the openings (3) are four in number and regularly spaced in a plane P transverse to the suction tube (1). The number of four openings is optimized so that the stirring is effective without the suction tube (1) is weakened.

The fact that the openings are regularly spaced around the suction tube allows a more efficient mixing of the cooling air and the mixture of air and ash.

According to a configuration, the opening or openings (3) are rectangular openings (3) whose longitudinal axes are included in a plane transverse to the suction tube (1).

In one configuration, the total area of all openings is proportional to the diameter of the suction tube (1).

In a non-limiting example, for a cylindrical tube having a diameter D of 28 mm, the opening or openings (3) are in the form of a rectangle of width 1 of 3 mm and length L of 12 mm.

In order to be able to connect the tip to the sheath (84) of the suction device (8), the connection end (5) comprises a connection means.

According to one configuration, the deflector (2) is detachable from the suction tube (1).

According to one configuration, the deflector (2) and the suction tube (1) are monobloc.

The configuration of the nozzle allows efficient cooling of the mixture (6) of air and ash sucked by the suction end (4).

The deflector (2) increases the speed of the air (7) entering the openings (3) for cooling the mixture (6) of air and ash for Venturi effect.

By doing an experiment represented on the figure 11 with such a configuration and a mixture (6) of air and hot ash having a temperature of Te = 250 ° C, the temperature of the mixture (6) drops to T1 = 45 ° C at the inner walls of the tube ( 1) suction and T2 = 92 ° C in the center of the mixture (6). This result is very important because it shows that thanks to the deflector (2) and openings (3), it is possible to lower the temperature of the mixture (6) of air and ash by more than 60%.

Thus two parameters are important to define the efficiency of the cooling tip: the temperature of the mixture (6) of air and ash at the end of the nozzle at the end (5) of connection with the sheath (84) of the suction device (8) and the ratio of the amount of mixture (6) of air and ash to the amount of cooling air (7). If we increase the amount of cooling air (7), in other words increasing the number of openings (3) or the size of the openings (3), a well-cooled air is obtained at the outlet of the nozzle, but the quantity of hot air will be proportionally lowered, thus causing a significant decrease in the capacity of the nozzle. suction at the suction end (4) of the nozzle. With the configuration of the nozzle according to the invention, the volume of air and hot ash (6) is equal to 8.4 times the volume of air (7) cooling. In other words, only 10.63% of the power of the suction is dedicated to cooling and the remaining 89.36% is used to suck the mixture (6) of air and hot ash. The use of such a tip has shown that one can significantly lower the mixing temperature (6) of air and hot ash by using openings (3) adjacent to an aerodynamic deflector (2), that the deflector (2) improves the speed of the cooling air (7) and the temperature of the air and ash mixture (6) has been decreased by more than 50% in the center of the mixture (6) and by more than 80 % in the vicinity of the inner walls of the tip.

A nozzle having neither opening nor deflector (2), the mixture (6) of air and ash sucked by the end (4) suction do not cool and remain at the same temperature out of the nozzle entering the sheath (84) of the suction device (8).

A nozzle having openings (3) and having no deflector (2) does not sufficiently cool the mixture (6) of air and ash. For example, experiments have been carried out for such an endpiece comprising four rectangular openings (3) 3 mm wide and 12 mm long made in the suction cylinder of the endpiece. The openings (3) have been made 40 mm from the suction end (4) to be sufficiently distant from the suction end (4) around which the ambient air is still very hot to be effective. With such a type of nozzle, the temperature of the mixture (6) of air and ash is slightly lowered through the openings (3) which allow air to enter at a temperature normal temperature of 20 ° C. At the end (4) of suction, the temperature of the mixture (6) is close to 250 ° C and at the end (5) of connection, the temperature of the mixture (6) is close to 180 ° C on the areas adjacent to the inner surface of the mouthpiece. However, the temperature remains very high in the zone near the axis of the tube of the order of more than 200 ° C. The temperature is still too high at the tip outlet for which a temperature of at most 50 ° C is ideally sought. In addition, these openings (3) are sources of additional noise to the noise produced by the suction of the mixture (6) of air and ash entering by suction by the suction end (4).

A mouthpiece ( figure 8 ) having a deflector (2a) having a generally ellipsoidal section and having several rows of openings (3a) which are not adjacent to the deflector (2a) is also not sufficiently effective. For example, experiments have been performed with such an arrangement. Since the deflector (2a) prevents the hot air around the suction end (4a) from reaching the openings (3a), the openings (3a) could be made closer to the end ( 4a) at about 8 mm. With such a tip, the very hot air travels a long distance inside the tip. The temperature of the air at the outlet of the nozzle is of the order of 145 ° C. The volume of air sucked at the suction end (4a) is equivalent to 1.5 times the volume of air entering through the openings (3a) for cooling. Thus, 40% of the suction power is dedicated to cooling. The remaining 60% of the power is used to suck up the mixture of air and hot ash. In fact, part of the air entering through the openings (3a) does not mix homogeneously with the hot air because it remains in the vicinity of the inner wall of the suction cylinder (1a) of the nozzle. The shape of the deflector (2a) and the number of openings (3a) are important parameters. One might think that increasing the number of rectangular openings (3a) would improve the cooling of the mixture of air and hot ash. However, the increase in the number of openings (3a) is accompanied by a decrease in suction volume at the suction end (4a) of the nozzle. As a result, the volume of hot ash aspirated decreases significantly and renders the suction device (8) unusable.

The invention also relates to a suction device (8). The suction device (8) comprises a vacuum means (81) capable of causing the suction of waste, a collector (82) of waste sucked by the means (81) of vacuum, a sleeve (84) suction connected to the waste collector (82) and a cooling tip according to the invention. The collector (82) of waste is for example a can collects the ash. For example, a filter can prevent the ashes that are sucked from entering the depression means (81).

The tip can be adapted for any type of device (8) suction.

It should be obvious to those skilled in the art that the present invention allows embodiments in many other specific forms without departing from the scope of the invention as claimed. Therefore, the present embodiments should be considered by way of illustration, but may be modified within the scope defined by the scope of the appended claims, and the invention should not be limited to the details given above.

Claims (13)

1. Cooling nozzle comprising at least:

   - a suction pipe (1) intended to extend a tube (84) of a device (8) for suction of ashes,
   an end (5) for connection of the suction pipe (1) being intended to be connected to the tube (84), the other end being the end (4) for suction of ashes,

   - a cylindrical deflector (2) surrounding at least a portion of the suction pipe (1) being fixed onto the outer wall of the suction pipe (1),

   - at least one opening in the wall of the suction pipe (1) for sucking in fresh air,

   characterised in that the opening, or openings (3) are adjacent to the place in which the deflector (2) is fixed onto the portion of the suction pipe (1) which is surrounded by the deflector (2).
2. Cooling nozzle according to claim 1, characterised in that the deflector (2) comprises at least:

   - a pipe (21) in the form of a truncated cone coaxial with the suction pipe (1), the large base of the pipe (21) in the form of a truncated cone being directed towards the connection end (5) of the suction pipe (1) and forms an annular opening through which fresh air is fed to the suction opening or openings of the wall of the suction pipe,

   - a circular part (22) fixing the vertex of the pipe (21) in the form of a truncated cone to the outer wall of the suction pipe (1).
3. Cooling nozzle according to claim 1, characterised in that the deflector (3) comprises at least:

   - a right cylindrical pipe (21), coaxial with the suction pipe (1),

   - a circular part (22) fixing the apex of the right cylindrical pipe (21) to the outer wall of the suction pipe (1).
4. Nozzle according to claim 2 or 3, characterised in that the circular part (22) has a section of portion of circle.
5. Nozzle according to claim 2 or 3, characterised in that the circular part (22) has a straight section.
6. Nozzle according to at least one of claims 1 to 5, characterised in that the openings (3) are four in number uniformly spaced in a plane transversal to the suction pipe (1).
7. Nozzle according to at least one of claims 1 to 6, characterised in that the opening or openings (3) are rectangular openings (3) of which the longitudinal axes are included in a plane transversal to the suction pipe (1).
8. Nozzle according to claim 1, characterised in that the distance Ddef separating the ash suction end (4) and the deflector (2) is within a range of 10 cm to 20 cm.
9. Nozzle according to claim 1, characterised in that the length of the deflector (2) is within a range of 35mm to 55 mm.
10. Nozzle according to claim 4, characterised in that the portion of circle of the section of the circular part (2) has a radius within a range of 2 mm to 7 mm.
11. Nozzle according to at least one of the preceding claims, characterised in that the connection end (5) comprises a connection means intended to connect the nozzle to a tube (84) of a suction device (8).
12. Nozzle according to at least one of claims 1 to 11, characterised in that the deflector (2) is detachable from the suction pipe (1).
13. Suction device (8), characterised in that it comprises a means (81) for generating a depression, able to cause the suction of waste, a collector (82) of waste sucked in by the depression means (81), a suction tube (84) connected to the waste collector (82), and a cooling nozzle according to claim 1.

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