FR2789880A1 - Complementary component for vacuum cleaner nozzle base plate, close the air flow conduit by the presence of a rounded convex elbow - Google Patents

Abstract

The complementary component (10) is fixed on the base plate (30) opposite a surface to be cleaned (31), so as to close the air flow conduit (35) by the presence of a rounded convex elbow (12), defined by a radius of curvature R. The complementary component can also be provided with apertures emerging in a closed cavity comprising or not comprising an absorbent material to reduce the ventilation noise generated by the passage of sucked air.

Description

COMPLEMENTARY PART FOR A SQUEEGEE BASE PLATE

VACUUM

  The present invention relates to a dust vacuum cleaner nozzle, and more

  particularly an improvement in the air performance of such a nozzle.

  A vacuum cleaner nozzle is generally in the form of a generally plastic housing comprising a cover and a base plate, the cover and the base plate defining a flow channel for the aspirated air. The base plate has at least one suction channel open towards the surface to

  clean and in aeraulic communication with the flow channel.

  One of the improvements made to the production of such nozzles consists in the production of a base plate entirely comprising the air circulation channel, so that the cover is no longer necessary to define the channel.

of air intake.

  Such a nozzle therefore comprises a single functional part, hereinafter referred to as the base plate, the cover being no longer essential and playing only one role.

  protection of the nozzle and contributing to the aesthetic effect of the nozzle.

  Such nozzles, although having reduced production costs due to the plastic material used and their "one-piece" production, generate problems

  aeraulic turbulence due to their embodiment by molding.

  Indeed, when the molding method used is the injection of plastic material into metal molds to obtain the part in one piece, drawers

  are used and must then be able to be removed from the injected part.

  FIG. 1b illustrates these remarks by presenting a part 100 having an elbow 110 and obtained by molding using drawers 101 and 102. The fact of drawing back the drawers 101 and 102 necessarily implies the presence of a sharp angle, or even an excess thickness 103 of closure. This sharp angle is the source of turbulence which can be explained by the separation of the boundary layer.

  located downstream of the sharp corner, on the adjoining wall.

  It is therefore not possible, due to the "monoblock" appearance given to the nozzle, defining an air flow channel, to produce interior roundings in order to

  avoid disturbing the suction flow.

  The appearance of a sharp interior angle is particularly visible in FIG. 1a, representing a nozzle of the prior art. This nozzle comprises a base plate 6 which has an outer elbow 1 and an inner elbow 9 whose

  ends define an opening 8, which is the suction opening of the squeegee.

  The base plate defines a flow channel 5 opening into a conduit 4

  connected to the engine block to generate the suction flow.

  The object of the present invention is to remedy the drawbacks of the prior art by presenting a complementary part of a vacuum cleaner nozzle, said nozzle comprising in particular a base plate partially defining the air flow duct at the interior of the squeegee and at least in part the air suction duct in the squeegee, said air flow duct inside the squeegee can also be partly defined by a cover arranged on the base plate, characterized in that this complementary part is fixed on the base plate opposite the surface to be cleaned in order to close the air flow duct by presenting a rounded convex elbow, defined by a radius of curvature A. Thanks to this only judiciously chosen additional part, the main advantages of the "monobloc" type manufacturing of a fully functional part are retained, namely a base plate uniting the e or them

  suction and flow channels.

  The design of the nozzle in two parts, one of which, significantly smaller, has rounded interior angles to avoid turbulence generated during the passage of air through the nozzle. This feature is particularly advantageous when the nozzle is mainly made in one piece and has a bend in the air flow circuit, due to its mode

by molding.

  Advantageously, the radius of curvature is greater than 5 mm, so that the effect announced is sufficient to bring a significant increase in

crevice performance.

  Advantageously, the complementary part also defines part of the

  air intake duct in the squeegee.

  This feature allows said part to be able to present a part parallel to the surface to be cleaned, capable of being brought into contact with said surface, said part being able in particular to be used to fix an accessory for

  cleaning, such as wire-pulling material, brush, ...

  According to an alternative embodiment of the invention, the complementary part comprises, on at least one interior part of said part defining in part

  the flow conduit, openings opening into a closed cavity.

  These openings, during the flow of the aspirated air flow, make it possible to absorb the

  air noise by resonance and absorption.

  The present invention also relates to a vacuum cleaner nozzle comprising a base plate defining at least partially a suction duct and an air flow duct, and comprising a complementary part

  ventilation in accordance with this description.

  The invention also relates to a dust vacuum cleaner comprising in particular a motor unit capable of generating a flow of air circulation in conduits terminated by a suction conduit or a nozzle open to the surface to be cleaned, the suction conduit comprising a piece

  additional ventilation in accordance with this description.

  The present invention will be better understood from the description which follows.

  follow, with reference to the appended figures, among which: - Figure 1 is a schematic view of a nozzle of the prior art, in a side view in section, - Figure 2 is a view similar to the previous one, o l object of the present invention has been transposed to a nozzle of the prior art, - Figures 3 to 5 show the object of the present invention in an elevational view (Figure 3), a front view (Figure 4) and a sectional view (Figure 5) along the axis AA of Figure 4, - Figure 6 shows a vacuum cleaner nozzle equipped with the present invention, in a side sectional view, - Figure 7 shows an improved version of the present invention, - Figure 8 is a sectional view of the additional part having a noise reduction device, - Figure 9 is a schematic view of the additional part equipped

  a device for reducing the noise generated by the flow of aspirated air.

  The present invention is illustrated in Figure 2 in a diagram showing a vacuum cleaner nozzle of the state of the art as shown in Figure 1a and modified from the present invention. Thus, this differs from the prior art by the fact that the nozzle is made up of two parts, a main part, the base plate 6, and a complementary part 2 coming, by mechanical means of the clipping or screwing type. , position itself mechanically on the base plate 6, a

  partial overlap 7 of the two parts ensuring the tightness of the assembly.

  Subsequently, we will designate by suction nozzle of the squeegee, the open channel (s) towards the surface to be cleaned and intended to allow the entry of air into the squeegee, and by squeeze flow channel , the internal area of the

squeegee circulates the sucked air.

  The independent production of the complementary part 2 makes it possible in particular to give it a rounded shape 3 promoting the flow of the suctioned fluid when

  the squeegee is connected, via line 4, to a suction unit.

  The complementary part 2 makes it possible to close the squeegee flow conduit.

  In the embodiment presented, it is also essential for closing the suction duct of the squeegee. This latter feature does not, however, constitute a necessary condition for carrying out the present invention. Furthermore, the invention finds all its interest when the base plate entirely defines the air flow duct, without however the present invention being limited to this only type of nozzle, the nozzle having a cover defining partly the flow duct not being excluded from the

  scope of the present invention.

  Figures 3 to 5 concretely show such a complementary part 10 according to the invention. It is made of a plastic type material and has a substantially rectangular appearance. It comprises a flat part 11 in the extension of which is situated a curved part 12 along the radius of curvature R, producing the aeraulic elbow. In this curved part, reinforcements 14 make it possible to stiffen the bent assembly, in order to avoid

  vibration phenomena by elastic deformation.

  The radius of curvature R of the curved part 12 is greater than 5 mm and preferably greater than 10 mm. In the example presented, the radius of curvature is close to 17 mm. These values avoid turbulence

  when the air passes through the squeegee.

  The system for holding this part on the base plate of a nozzle is provided by two series of two clips arranged on the lateral sides of the part,

  constituting four fixing points distributed over said part.

  One of the particularities of the two series of clips used is to present an inverted assembly mode with respect to each other. Thus, two of the four fixing clips called front clips 16 have an external holding hook while the other two clips called rear clips 18 have a hook

facing inward.

  This arrangement allows, when the part 10 is mounted on the base plate, a firm hold of this part on the base plate, without risk of separation during the handling of the nozzle. Indeed, the two movements to separate the clips 16 and the clips 18 being antagonistic one

  on the other, it seems unlikely that this operation could be carried out by itself

  even when using a vacuum cleaner fitted with a nozzle with the part

complementary 10.

  Furthermore, the end of the curved part 12 has a flat surface 19 on which is arranged a wire puller 20 of the known type. This arrangement is all the more advantageous since this operation can be carried out before the assembly operation of the complementary part 10 on the base plate and also allows the wire stripper to be changed quickly and reliably by changing the

additional document 10.

  The end opposite the elbow of the complementary part consists of a notch 13 in the form of a baffle capable of cooperating with a complementary notch of the base plate in order to constitute a zone

  seal when assembling the two parts.

  FIG. 6 shows an extra-flat nozzle provided with the present invention, in a cross-sectional view. In order to better identify the purpose of this

  invention, the additional bent part 10 has been hatched.

  Thus, the nozzle 28 comprises a base plate 30, provided with a pad 42, and extending from the surface to be cleaned 31 to the articulation ball 36, in

  defining a suction channel 34 and a suction air flow channel 35.

  The squeegee is also provided with a circular means 40 for retaining the clip-on type of a tube 38 for evacuating waste, the ball joint 36 and the circular clip 40

  allowing to operate the nozzle along several axes.

  The bent complementary part 10 is held by clips not shown. The seal between the base plate and the bent complementary part is ensured by the notch 13 of the part 10 and a notch

  complementary formed on the base plate.

  FIG. 7 shows an improvement of the device by presenting the complementary part having openings 50 leading to a device

  absorption of air noise generated by the passage of air.

  FIG. 8 shows in section the internal arrangement of the absorption device of the complementary part 10, composed of the openings 50, opening into a

  cavity 52 substantially sealed, in particular against noise, closed by a partition 54.

  The openings 50 can be placed either all along the part as shown, or only on the vertical straight part, as shown in FIG. 7, or on the horizontal right part, or even on the curved part, or

  of course a combination of the parts mentioned.

  A first noise reduction effect is obtained by placing an acoustic absorbent material 53 behind the openings 50. This absorbent material is preferably a porous material such as for example a foam made of

  polyurethane or an intertwining of textile fibers (felt).

  A second effect of reducing the noise generated by such a structure is obtained by an acoustic resonance effect of the Helmhotz resonator type. In fact, behind each opening 50, there is an acoustic volume capable of resonating at a certain frequency. This resonance effect in the cavity 52 attenuates the noise emitted. The volume of the cavity 52 as well as the size of the openings 50 can be adapted as a function of the acoustic frequency or frequencies that it is sought to attenuate. The openings 50 preferably have

  a form of cylinder of revolution.

  Depending on the conditions of use of the air flow generated and the speeds generated, the diameters 56 are preferably between 0.5 and 3 mm, the lengths 58 of the cylinders can vary from I to 5 mm, preferably

of the order of 2.5 mm.

  FIG. 9 schematically proposes a modeling of the absorption units associated with each opening and delimited by the contours of the cavity 52 and the proximity of the other openings. Each absorption unit 57 thus has a volume varying between 450 to 1000 mm 3. Each absorption unit 57 is capable of attenuating a particular acoustic frequency. The arrangement of the openings 50 may, therefore, not be symmetrical and result from measurements concerning the frequency distribution of the

air noise.

  The total volume is of course the sum of the volumes associated with each absorption unit. The partitions between each unit are not compulsory, especially

  if the cavity is filled with a porous material.

  Advantageously, the edges 60 of the openings 50, on the air circulation side,

  can be rounded to limit air turbulence.

  The realization of the openings 50 is all the easier since the complementary part 10 has a surface intended to come into contact with the air drawn in.

  easily accessible for the production of said cavities.

  The invention can also be applied to a vacuum cleaner having no removable nozzle but simply a bent conduit whose end is open

  towards the surface to be cleaned and thus constituting a suction channel.

Claims (12)

  1. Complementary part (2, 10) of a vacuum cleaner nozzle, said nozzle comprising in particular a base plate (6, 30) partially defining the flow duct (5, 35) from the air to the inside the squeegee and at least in part the suction duct (34) for the air in the squeegee, said air flow duct (5, 35) inside the squeegee can also be partly defined by a cover arranged on the base plate, characterized in that this complementary part (2, 10) is fixed on the base plate (6, 30) opposite a surface to be cleaned (31), in order to close the air flow duct (5, 35) having a rounded convex bend (3, 12) defined by a radius of curvature R. 2. Complementary part (2, 10) of a vacuum cleaner nozzle according to the preceding claim, characterized in that the radius of curvature R is greater than 5 mm.   3. Complementary part (2, 10) of a vacuum cleaner nozzle according to one of   previous claims, characterized in that it also defines a   part of the air intake duct (34) in the squeegee.   4. Complementary part of a vacuum cleaner nozzle according to one of   previous claims, characterized in that it has a part   plane (19) parallel to the surface to be cleaned (31), capable of being placed   contact with said surface (31), and comprising a thread-pulling material (20).   5. Complementary part (2, 10) of a vacuum cleaner nozzle according to one of   previous claims, characterized in that it comprises, on at   at least an inner part of said part (2, 10) partially defining the flow conduit (5, 35), openings (50) opening into a closed cavity (52).   6. Complementary part (2, 10) of a vacuum cleaner nozzle according to the preceding claim, characterized in that the openings (50) are cylinders of revolution, the diameter (56) of these openings (50) being between 0.5 mm and 3 mm.   7. Complementary part (2, 10) of a vacuum cleaner nozzle according to the preceding claim, characterized in that the cylinders have a   length (58) between 1 to 5 mm.   8. Complementary part (2, 10) of a vacuum cleaner nozzle according to one of   claims 5 to 7, characterized in that an absorbent material   acoustic (53) is placed behind the openings (50).   9. Complementary part (2, 10) of a vacuum cleaner nozzle according to one of   previous claims, characterized in that it has two   holding systems on the base plate (6, 30), each system consisting of two clips (16, 18) arranged on the lateral sides of the part   (2, 10), constituting four fixing points distributed over said part.   10. Complementary part (2, 10) of a vacuum cleaner nozzle according to the preceding claim, characterized in that two of the four clips (18) for fixing have an internal holding hook while the two   other clips (16) have an external hook.   11. vacuum cleaner nozzle comprising a base plate (6, 30) defining at least in part a suction duct (34) and an air flow duct (5, 35), characterized in that it includes an additional part (2,   ) ventilation according to one of claims 1 to 10.   12. Dust extractor comprising in particular a motor unit capable of generating a flow of air circulation in conduits terminated by a suction conduit open towards the surface to be cleaned, characterized in that the suction conduit comprises a part   ventilation supplement (2, 10) according to one of claims 1 to 10.