CN106166046B

CN106166046B - Hard floor nozzle for absorbing coarse particles and fine dust

Info

Publication number: CN106166046B
Application number: CN201610341947.8A
Authority: CN
Inventors: 马库斯·科内利森; 多米尼克·迪施; 德克·赫尔隆; 弗兰克·利希特瑙尔; 约尔格·佐默; 马蒂亚斯·瓦恩霍斯特; 于尔根·齐尔斯
Original assignee: Warwick Corp
Current assignee: Warwick Corp
Priority date: 2015-05-21
Filing date: 2016-05-20
Publication date: 2020-09-18
Anticipated expiration: 2036-05-20
Also published as: ES2813750T3; CN106166046A; DE102015108051B4; JP2016214875A; JP6317394B2; TW201703713A; EP3095368B1; TWI629040B; EP3095368A1; DE102015108051A1

Abstract

The present invention relates to a suction nozzle of a vacuum cleaner for absorbing dirt and/or dust from a floor by means of a suction airflow, having a housing (1), a suction chamber (3) formed inside the housing (1), a suction channel (4) for leading a suction air flow and opening into the suction chamber (3), and a suction opening (5) formed as a bottom-side opening of the suction chamber (3), wherein the suction opening (5) has a central suction opening section (6) and two lateral suction opening sections (7) which are located on both sides of the central suction opening section (6), and the central suction opening section (6) is designed in such a way, namely, the width of the central suction inlet section (6) is increased from the suction channel (4) to the front surface of the suction nozzle, and the height of the central suction inlet section (6) is decreased from the suction channel (4) to the front surface of the suction nozzle at an angle of more than or equal to 6 degrees and less than or equal to 10 degrees.

Description

Hard floor nozzle for absorbing coarse particles and fine dust

Technical Field

The invention relates to a suction nozzle of a vacuum cleaner for absorbing dirt and/or dust from a floor by means of a suction airflow, having a housing, a suction chamber formed inside the housing, a suction channel for guiding the suction airflow and opening into the suction chamber, and a suction opening formed as a bottom-side opening of the suction chamber.

Background

Suction nozzles are known in practice, which are referred to as accessories, also referred to simply as nozzles or, depending on the purpose of use, as hard floor nozzles or carpet nozzles, and these nozzles are usually used in connection with vacuum cleaners for sucking dirt and/or dust from the floor. Vacuum cleaners with such suction nozzles usually have a base housing in which an electric suction motor for generating a suction air flow is arranged. The suction nozzle is usually connected to the vacuum cleaner in a fluid-tight manner via a flexible suction hose and/or a manoeuvring tube. In a vacuum robot, the suction nozzle is generally integrated in the substrate housing itself. A plurality of brush rows or the like for detaching dirt and/or dust from the floor are arranged on the suction nozzle. The dust and/or dirt thus detached from the floor is carried along by the suction air flow and is separated in the dust filter bag at least in a dust collecting chamber provided in the base housing.

Dirt or dust to be removed from the floor is divided into coarse particles and fine dust according to various particle sizes. In the prior art, suction nozzles optimized for coarse particle absorption are known on the one hand, while suction nozzles for particularly good fine dust absorption are also designed on the other hand. For example, hard floor suction nozzles are not usually provided for sucking coarse particles, but other suction nozzles exist which can be switched manually between coarse particle suction and fine dust suction by means of a foot switch. The brush row usually extends out of the suction nozzle through the operation of the foot switch, and the distance between the suction nozzle and the floor is increased through the brush row, so that coarse particles can be better absorbed or sucked. However, the suction nozzles known from the prior art can only meet opposite and opposite requirements (i.e. either for coarse-particle or fine-dust absorption) or have to be switched manually by the user between different operating modes.

Disclosure of Invention

Starting from this, the object of the invention is to specify a suction nozzle for absorbing dirt and/or dust, which is versatile for different particle sizes and has in particular the feature of being able to absorb coarse particles particularly well. The suction nozzle can absorb both coarse particles and fine dust without the operating mode of the suction nozzle having to be switched manually for this purpose. It is furthermore desirable that such a suction nozzle is characterized by a low thrust and/or by a low noise pollution.

The object of the invention is achieved by the features stated in the independent claims. Advantageous embodiments are specified in the dependent claims.

Accordingly, the object is achieved by a suction nozzle of a vacuum cleaner for absorbing dirt and/or dust from a floor by means of a suction air flow, having a housing, a suction chamber formed inside the housing, a suction channel for guiding the suction air flow and opening into the suction chamber, and a suction opening formed as a bottom-side opening of the suction chamber, wherein the suction opening has a central suction opening section and two lateral suction opening sections located on both sides of the central suction opening section, and the central suction opening section is designed such that the width of the central suction opening section increases from the suction channel towards the front side of the suction nozzle and the height of the central suction opening section decreases from the suction channel towards the front side of the suction nozzle at an angle of ≥ 6 ° and ≤ 10 °.

One of the points of the invention lies in the distribution of the suction openings into the central suction opening section and the two lateral suction opening sections, so that in particular the region for fine dust absorption is divided by the lateral suction opening sections and in particular the region for coarse particles is divided by the central suction opening section. By the above-described design of the central suction inlet section, which has a width which increases from the suction channel towards the front side of the suction nozzle, for example has a V-shaped design in top view, and has a height which decreases at an angle of ≥ 6 ° and ≤ 10 °, coarse particles can be guided off in an advantageous manner during propulsion, i.e. they are additionally mechanically conveyed to the suction channel with respect to the direction of the air flow. In addition to this type of "funnel effect" (Trichtereffekt), the central suction inlet section, due to its descending height, also functions as a fluid disperser, so that an essentially better coarse particle absorption is achieved compared to the designs known from the prior art. The suction air flows flowing through the lateral and central suction opening sections merge into one another in the region of the suction channel, from which the suction air flow with dirt or dust sucked up from the floor is guided out of the suction nozzle, for example by means of a connecting sleeve. The above-mentioned terms for describing the arrangement of the parts of the suction nozzle are based on the position and orientation of the suction nozzle, such as it is present in an operating state when suctioning a floor, on which the suction nozzle is placed and moved.

According to a preferred embodiment of the suction nozzle, the width of the central suction opening section increases linearly, in a stepped and/or curved manner, the height of the central suction opening section decreases linearly, in a stepped and/or curved manner and/or the height decreases at an angle of 8 °. The combination of an angle of 8 ° with a straight-line descending height has proved to be particularly advantageous.

According to a further preferred embodiment, the suction nozzle has a device for a sound barrier which is arranged in the central suction opening section in the direction of the suction air flow between the front side of the suction nozzle and the suction channel. According to a further preferred embodiment, a front-side fluid seal is provided, which is designed and embodied such that a central intake opening section is defined at least in sections on the front side of the suction nozzle. In particular in the case of an open shape of the central suction opening section, a reduction of the noise pollution of the suction nozzle can be achieved by providing means for a sound barrier and/or a fluid seal at the front side. The device for the sound barrier and/or the fluid seal of the front side are preferably designed and/or dimensioned in such a way that the mouthpiece meets the environmental design regulations

(EU) No. 666/2013 the loudness caused by the suction airflow during suction operation of the floor nozzle and/or the specification of the vacuum cleaner does not exceed 80db (a).

According to an equally preferred embodiment, the fluid seal on the front side is divided into two parts, wherein the means for the sound barrier are arranged between the two parts along the front side of the mouthpiece. The means for the sound barrier are formed, for example, by two brush rows of about 5cm in length, which are arranged offset at about 30 ° from one another on the housing. In the direction of extension perpendicular to the advancing direction, the means for sound shielding are preferably surrounded from both sides by the respective parts of the fluid seal of the front side in such a way that direct sound emission from the intake channel to the front side is reduced or prevented as far as possible.

According to a particularly preferred embodiment, the lateral intake opening sections are each delimited by an inner and an outer lateral fluid seal extending from the intake channel to one side of the suction nozzle, so that the central intake opening section is delimited by the inner lateral fluid seal of the respective lateral intake opening section. The inner and outer lateral fluid seals can basically be provided as seals for the intake air flow, but it is preferred to design the lateral fluid seals as one or more rows of brush rows, sealing lips and/or combinations of these. In addition, the lateral fluid seal may be formed at least through a part of the housing, for example through a baffle or a wall of the housing projecting in the direction of the floor. The inboard and outboard side fluid seals more preferably extend substantially parallel or substantially parallel to each other between the suction channel and the side of the mouthpiece.

Preferably, the cross section of the side intake port section (intake channel) has an outlet in the region of the intake channel, which has a width of 60mm or less, 50mm or less, 40mm or less, 35mm or less, 33mm or more, 30mm or more or 20mm or more, wherein the height of the outlet is preferably 50mm or less, 40mm or less, 30mm or less, 22mm or more, 20mm or more or 10mm or more. The width of the inlet of the lateral intake section on the floor side of the housing is preferably 50mm or less, 40mm or less, 35mm or less, 25mm or more, 20mm or more, 10mm or more, wherein the height of the inlet is preferably 20mm or less, 10mm or less, 7.6mm or more, 5mm or more, 2mm or more. A better suction effect can be achieved with a smaller width and/or height. More preferably, an air passage is formed in the intake channel between the two lateral intake port sections, through which air flow portions of 45% or more and 65% or less of the intake air flow through the central intake port section. The opening width of the air passage is preferably 25mm, 30mm, 32mm, 37mm, 40mm or 45 mm. The width of the central suction opening section on the front side of the suction nozzle is preferably equal or approximately equal to the width of the suction nozzle. With such a distribution of the suction air flow between the central suction inlet section and the lateral suction inlet sections, particularly good absorption of fine dust and coarse particles can be achieved.

It is further preferred that the lateral intake port section (intake channel) extends linearly away from the side of the intake channel facing the floor or intake chamber, but it is also possible for the intake port section (intake channel) to extend in a bent manner and/or in a curved manner away from the side of the intake channel facing the floor. The brush or sealing lip preferably extends away from the housing perpendicularly in the direction of the floor and is designed to be soft, so that during propulsion of the nozzle in the normal propulsion direction coarse particles or fine dust on the floor pass through the brush or sealing lip into the central suction opening section and/or into the lateral suction opening sections. The two inboard side fluid seals preferably define a path for suction airflow between the suction channel and the central suction inlet section.

According to a further preferred embodiment, the front fluid seal can be deflected into the intake chamber and is dimensioned such that it can be deflected completely into the intake chamber without touching the inner lateral fluid seal. This ensures that the front-side fluid seal can be returned unhindered into the undeflected initial position after passing through the coarse particles.

According to a further preferred embodiment, the fluid seal of the front side has a rectangular shape, wherein, in the case of a suction nozzle resting on a floor, the fluid seal of the front side extends from the housing up to the floor, is rounded off on the side facing away from the side and/or on the side facing away from the housing, and has a first region extending from the housing towards the floor and a second region adjoining it, wherein the second region is characterized by a lower strength relative to the first region, and/or is arranged at an angle (in the sense of a curve) relative to the normal of the floor, extending in the direction of the suction chamber, in the case of a suction nozzle resting on a floor. The fluid seal on the front side is preferably offset in its undeflected state at an angle in the advancing direction in such a way that coarse particles outside the central intake opening section can be conveyed into the central intake opening section without a suction air flow in the vicinity and only by the nozzle pushing in the advancing direction. It is also more preferred to design the front-side fluid seal in such a way that a gap is formed between the front-side fluid seal and the two inner-side lateral fluid seals. The gap preferably extends over at least 50 mm.

In principle, there are different possibilities for designing a device for a sound barrier. It is particularly preferred, however, that the means for the sound barrier have a V-shaped or semicircular shape which is open towards the rear side of the mouthpiece, and/or that the means for the sound barrier consist of plastic, and/or that the means for the sound barrier consist of a harder material than the fluid seal of the front side if a fluid seal of the front side is provided. According to a further preferred embodiment, the fluid seal on the front side is designed as a plurality of means for sound protection for the intake air flow, wherein the means for sound protection for the intake air flow are arranged along the front side of the housing. In a further preferred embodiment, the front fluid seal is arranged between the intake channel and the front face of the housing at a distance from the front face or on the front face at an edge of the housing and/or extends parallel to the front face.

According to a particularly preferred embodiment, the suction opening and/or the central suction opening section has the shape of an isosceles triangle, wherein the suction channel preferably opens into the suction chamber formed in this way in the region of the tip between the sides of the triangle, the central suction opening section extends from the suction channel to the base of the isosceles triangle and the lateral suction opening sections extend along the respective side of the isosceles triangle from the suction channel up to the corner of the isosceles triangle located opposite the tip. By means of the above-described design, the coarse-grained region formed by the central suction opening section is arranged substantially before the fine-grained region formed by the lateral suction opening sections in the course of the advance of the nozzle, wherein the lateral suction opening sections are adjacent to the central suction opening section at the corners of an isosceles triangle with oppositely arranged tips. This advantageously achieves fine dust absorption at least in the corner regions of the suction nozzle and up to the front side of the suction nozzle.

According to a further preferred embodiment, the two lateral intake opening sections extend away from the intake channel to one side of the suction nozzle, respectively, such that the angle α between the longitudinal extension directions of the two lateral intake opening sections is 45 ° ≦ α ≦ 160 °, preferably 90 ° ≦ α ≦ 135 °, particularly preferably the angle α is equal to or substantially equal to 135 °, or the two lateral intake opening sections extend away from each other along a curve from the intake channel. If the two lateral suction inlet sections extend straight or approximately straight between the suction channel and one side of the suction nozzle, for example suction inlets arranged along the sides of an isosceles triangle, the central suction inlet section preferably has the shape of an isosceles triangle, the base of which is oriented in the direction of the front face of the suction nozzle.

According to a preferred embodiment, the suction opening has a further central suction opening section and two further lateral suction opening sections on both sides of the further central suction opening section, wherein the central suction opening section and the further central suction opening section extend away from the suction channel in opposite directions, so that the two lateral suction opening sections and the two further lateral suction opening sections form an X-shaped configuration. The suction nozzle designed in this way can absorb coarse particles both during forward movement and during backward movement. The suction nozzle is preferably designed symmetrically, in particular mirror-symmetrically, in the forward and in the backward direction. More preferably, the suction channel represents a midpoint of the design, the central suction opening section and the two lateral suction opening sections and in particular the additional central suction opening section and the two additional lateral suction opening sections, which are opposite in mirror symmetry, extending away from the midpoint. In this design, instead of manually rotating the suction nozzle around 180 ° as known in the prior art, the user can simply move the suction nozzle forward and backward in order to absorb coarse particles in forward and backward movements.

Drawings

The invention is subsequently further explained by means of preferred embodiments with reference to the drawings. Wherein:

FIG. 1 shows a nozzle according to a preferred embodiment of the invention in a bottom view of the nozzle, and

fig. 2 shows the suction nozzle according to fig. 1 in a perspective view.

Detailed Description

Fig. 1 and 2 show a schematic bottom view of a suction nozzle, also called floor nozzle, according to a preferred embodiment of the invention. The suction nozzle has a housing 1 made of plastic, on which a bottom plate 2 is formed on the underside. A suction chamber 3 is formed below the bottom plate 2, into which a suction channel 4 opens and which forms a suction opening 5 as an opening at the bottom side. As can be seen from fig. 1, the bottom plate 2 as well as the suction opening 5 have the shape of an isosceles triangle, the base 6a of which represents the front face of the nozzle in the direction of propulsion.

The intake channel 4 is connected in a fluid-tight manner to a connecting sleeve (not shown) arranged on the upper side of the housing 1. On this connection sleeve, the actuating tube and/or the flexible hose can be connected in a fluid-tight manner to a base housing of the vacuum cleaner, in which an electrically driven suction motor for generating the suction air flow is arranged. In a dust collecting chamber provided in the base housing, dirt and/or dust carried by the suction air flow from the floor to be cleaned can be separated in the dust filter bag.

The suction opening 5 has a central suction opening section 6 and two lateral suction opening sections 7 which are located on both sides of the central suction opening section 6 or laterally surround the central suction opening section 6. The lateral suction inlet sections 7 extend linearly from the suction channel 4 towards the corners 7a of the isosceles triangle, respectively, so that the angle α between the longitudinal extension directions of the two lateral suction inlet sections 7 is 135 °. The lateral intake port section 7 is fluidically defined by an inner and an outer lateral fluid seal 8. The outer lateral fluid seals 8 extend from the respective corners 7a of the isosceles triangle along the respective sides and merge into one another in a semicircular shape between the two sides which partially define the suction channel 4.

Accordingly, the entire rear side of the suction nozzle is defined by the lateral fluid seals 8 on the outside, which lateral fluid seals 8 are primarily provided as brush rows. The inner lateral fluid seal 8 extends approximately parallel to the outer lateral fluid seal 8 away from the intake channel 4 in the direction of the angle 7a such that an air passage 9 for the intake air flow is formed in the intake channel 4 between the two inner lateral fluid seals 8. The air channel 9 now has a width of approximately 32mm, while the two lateral intake opening sections 7 each have a width of approximately 33mm in the region of the intake channel 4. By means of the above-mentioned dimensioning, it is achieved that approximately 45% of the suction air flow flows from the suction channel 4 through the central suction inlet section 6, while the remaining approximately 55% is distributed uniformly over the two lateral suction inlet sections 7.

Like the suction opening 5 and the bottom plate 2, the central suction opening section 6 has the shape of an isosceles triangle, wherein two inner lateral fluid seals 8 define the sides of the central suction opening section 6 in a fluid-tight manner. As already mentioned, an air passage 9 leading to the suction channel 4 is provided at the tip of the central suction opening section 6, while a fluid seal 11 for at least partially sealing the front side of the central suction opening section 6 is provided opposite thereto at the bottom edge 6a and in register with the front side of the suction nozzle.

On the one hand, the width of the central intake opening section 6 increases in a funnel-like or V-shaped manner from the intake channel 4 linearly towards the bottom edge 6a or the front of the suction nozzle, wherein, on the other hand, the height of the central intake opening section 6 decreases in a linear manner from the intake channel 4 towards the bottom edge 6a or the front of the suction nozzle at an angle of approximately 8 °. The central intake port section 6 thus functions as a type of fluid diffuser, so that coarse particles can be absorbed particularly well by the central intake port section 6 which is designed in this way.

The front fluid seal 11 is designed as a soft sealing lip, so that coarse particles can pass through it. Coarse particles in the central suction inlet section 6 are carried along by the suction gas flow and are sucked in through the suction channel 4. The front-side fluid seal 11 extends from the bottom plate 2 as far as the floor, but a gap of approximately 50mm is formed laterally between the front-side fluid seal 11 and the corner 7a of the suction nozzle. The front fluid seal 11, which is designed as a sealing lip, is thereby deflected into the intake chamber 3 when passing coarse particles, without the inner lateral fluid seal 8 being touched.

The front fluid seal 11 already reduces the occurrence of noise pollution caused by the intake air flow, while means 12 for a sound barrier are provided for further reducing the noise pollution, which means are embodied in the illustration in fig. 1 and 2 as a V-shaped strip integrally formed with the housing 1, which strip is oriented from the bottom plate 2 toward the floor, but does not touch the floor here. In the central suction opening section 6, the means 12 for sound shielding thus designed are arranged in the central suction opening section 6 in the direction of the suction air flow between a bottom edge 6a forming the front side of the suction nozzle and the suction channel 4. In an alternative design, not shown, the means 12 for sound shielding can also be arranged on the front side of the central suction opening section 6 or on the front side of the suction nozzle between the parts of the fluid seal 11 arranged on the front side. Likewise, the front fluid seal 11 can be designed as a plurality of devices 12 for sound shielding arranged one behind the other transversely to the advancing direction on the front side of the central intake opening section 6.

The distance between the front side fluid seal 11 and the means for sound barrier 12 is about 15mm, while the distance between the means for sound barrier 12 and the inner side lateral fluid seal 8 is about 22mm, respectively. The means 12 for sound barrier can alternatively consist of two brush rows of about 5cm long, which are arranged offset from one another by about 30 ° on the bottom plate 2, so that at least the direct emission of sound from the suction channel 4 to the front of the suction nozzle is limited.

A particularly effective absorption of fine dust and coarse particles is achieved by the above-described design of the central suction inlet section which has a width which increases from the suction channel to the front of the suction nozzle and a height which decreases at an angle of ≥ 6 ° and ≤ 10 °, without the need for manual switching between fine dust and coarse particles as in the designs known from the prior art. In addition, the dimensions of the lateral intake port section 7, which are proven by tests, additionally achieve higher fluid velocities and larger volumetric flows, which additionally promote very good and effective fine dust absorption. Since the suction opening 5 has a relatively small vacuum attachment area, the above-described design is characterized by a relatively small propulsive force. On the other hand, since the central intake opening section 6 is open in contrast thereto, the suction nozzle additionally features a very effective coarse particle absorption, wherein only low noise pollution results due to the means 12 for sound shielding and the front-side fluid seal 11.

List of reference numerals

Housing 1

Bottom plate 2

Suction chamber 3

Suction channel 4

Suction inlet 5

Central suction inlet section 6

Bottom edge 6a

Side suction inlet section 7

Corner 7a

Side fluid seal 8

Air passage 9

Front-side fluid seal 11

Means 12 for sound barrier.

Claims

1. A suction nozzle of a vacuum cleaner for sucking dirt and/or dust from a floor by means of a suction airflow, having a housing (1), a suction chamber (3) formed inside the housing (1), a suction channel (4) for guiding the suction airflow and leading into the suction chamber (3), and a suction opening (5) formed as a bottom-side opening of the suction chamber (3),

wherein the suction inlet (5) has a central suction inlet section (6) and two lateral suction inlet sections (7) which are located on both sides of the central suction inlet section (6), and

the central intake opening section (6) is designed in such a way that the width of the central intake opening section (6) increases from the intake channel (4) towards the front side of the suction nozzle, characterized in that the height of the central intake opening section (6) decreases from the intake channel (4) towards the front side of the suction nozzle at an angle of more than or equal to 6 DEG and less than or equal to 10 DEG, the suction nozzle has a device (12) for a sound barrier, which is arranged in the central intake opening section (6) in the direction of the intake air flow between the front side of the suction nozzle and the intake channel (4), and the device (12) for a sound barrier has a V-shaped or semicircular shape which is open towards the rear side of the suction nozzle.

2. Nozzle according to claim 1, wherein the width of the central suction inlet section (6) increases linearly, in a stepped and/or curved manner, the height of the central suction inlet section (6) decreases linearly, in a stepped and/or curved manner and/or the height decreases at an angle of 8 °.

3. Nozzle according to claim 1 or 2, wherein the nozzle has a front-side fluid seal (11) which is embodied and designed such that the central intake opening section (6) is defined at least in sections on the front side of the nozzle.

4. Nozzle according to claim 3, wherein the fluid seal (11) of the front side is divided into two parts and the means (12) for sound barrier is arranged between the two parts along the front side of the nozzle.

5. A nozzle according to claim 3, wherein the lateral intake opening sections (7) are defined by inner and outer lateral fluid seals (8), respectively, extending from the intake channel (4) to one side of the nozzle, whereby the central intake opening section (6) is defined by the inner lateral fluid seal (8) of each of the lateral intake opening sections (7).

6. A nozzle according to claim 5, wherein the front fluid seal (11) is designed to be deflectable into the suction chamber (3) and is dimensioned such that the front fluid seal (11) can be deflected completely into the suction chamber (3) without touching the inner lateral fluid seal (8) there.

7. Nozzle according to claim 5, wherein the fluid seal (11) of the front side has a rectangular shape, in the case of a floor-mounted suction nozzle, the fluid seal (11) of the front side extends from the housing (1) as far as the floor, rounded off on the side facing away from the lateral fluid seal (8) and/or from the housing (1), the front fluid seal (11) has a first region extending from the housing (1) to the floor and a second region connected thereto, wherein the second region is characterized by a lower strength with respect to the first region and/or the fluid seal (11) of the front side extends in the direction of the suction chamber (3) with the suction nozzle placed on a floor and is arranged curved with respect to the normal of the floor.

8. Nozzle according to claim 5, wherein the front fluid seal (11) is designed such that a gap is formed between the front fluid seal (11) and the two inner lateral fluid seals (8).

9. Nozzle according to claim 1, wherein the means (12) for sound barrier consist of plastic.

10. Nozzle according to claim 4, wherein the means (12) for sound barrier consist of a harder material with respect to the fluid seal (11) of the front side.

11. Nozzle according to claim 3, wherein the fluid seal (11) of the front side is designed as a plurality of the means (12) for sound barrier of the suction air flow and the means (12) for sound barrier of the suction air flow are arranged along the front side of the housing (1).

12. A nozzle according to claim 3, wherein the front fluid seal (11) is arranged between the suction channel (4) and the front face of the housing (1) at a distance from the front face or on one edge of the housing (1) on the front face and/or extends parallel to the front face.

13. Nozzle according to claim 1, wherein the suction inlet (5) and/or the central suction inlet section (6) has the shape of an isosceles triangle.

14. A nozzle according to claim 13, wherein the suction channel (4) opens into the suction chamber (3) thus formed in the region of the tip between the sides of the triangle, the central suction inlet section (6) extending from the suction channel (4) to the base (6a) of the isosceles triangle and the side suction inlet sections (7) extending from the suction channel (4) along the respective side of the isosceles triangle up to the corner (7a) of the isosceles triangle located opposite the tip.

15. A nozzle according to claim 5, wherein both of the side suction inlet sections (7) extend away from the suction channel (4) towards one side of the nozzle, respectively, such that the angle α between the longitudinal extension directions of both of the side suction inlet sections (7) is 45 ° ≦ α ≦ 160 °, or both of the side suction inlet sections (7) extend curvilinearly away from each other from the suction channel (4).

16. A nozzle as claimed in claim 15, wherein the angle α between the longitudinal extension directions of the two side suction inlet sections (7) is 90 ° ≦ α ≦ 135 °.

17. A nozzle as claimed in claim 16, wherein the angle α between the longitudinal extension directions of the two side suction inlet sections (7) is equal to 135 °.

18. Nozzle according to claim 1, wherein the suction opening (5) has one further central suction opening section and two further lateral suction opening sections on both sides of the further central suction opening section, and the central suction opening section (6) and the further central suction opening sections extend away from the suction channel (4) in opposite directions, such that the two lateral suction opening sections (7) and the two further lateral suction opening sections form an X-shaped layout.