EP3449791B1 - Suction nozzle for a suction cleaner - Google Patents

Description

field of technology

The invention relates to a suction nozzle for a suction cleaning device, the suction nozzle having a suction channel for connection to a blower of a suction cleaning device, a suction channel end area of the suction channel opening into an elongated suction mouth, the longitudinal extent of which is oriented transversely to a main direction of movement of the suction nozzle (1), the Suction channel end area has a plurality of flow openings opening into the suction port, which are connected in a cascade fashion such that a first flow portion flowing from the suction port through a first flow opening into the suction channel end area flows past a second flow opening of the suction channel end area within the suction channel end area, with the first flow portion and add a second flow component flowing through the second flow opening into the suction channel end area.

Furthermore, the invention relates to a vacuum cleaning device with a suction nozzle.

State of the art

Suction nozzles and suction cleaning devices of the aforementioned type are known in the prior art.

The suction nozzle can be designed, for example, in the manner of an attachment and can be detachably connected to a base unit of a vacuum cleaning device. Alternatively, the suction nozzle can also be designed in one piece with the vacuum cleaning device. The suction nozzle has a suction channel, which on the one hand has a flow connection to a fan of the vacuum cleaning device and on the other hand opens into the suction mouth. When the fan is in operation, a vacuum is applied to a surface to be cleaned via the suction mouth, so that dust and/or dirt on the surface can be conveyed through the suction channel in the direction of a suction material collection container.

The publication shows such a solution, for example U.S. 2008/0209671 A1 .

Summary of the Invention

Based on the aforementioned prior art, it is the object of the invention to create a suction nozzle which has a uniform suction air intensity along the suction mouth, regardless of the structural conditions of the suction nozzle, so that the suction nozzle preferably achieves an optimal cleaning result over its entire width.

In order to achieve the aforementioned object, it is proposed that the suction channel end area is an end-side extension of the suction channel, with the suction channel end area relative to an orientation of the vacuum cleaning device during a normal use position - in a viewing direction parallel to a surface to be cleaned and transverse to a longitudinal extension of the suction mouth - over the suction mouth and parallel along the suction mouth between the suction mouth and the suction channel, wherein the suction channel is connected to the suction mouth in a decentralized manner in relation to the viewing direction and is assigned on one side to an end region of the suction mouth, with the suction channel end region enabling an asymmetrical connection of the suction channel to the suction mouth.

(continued on page 3 of the originally submitted documents)

The suction mouth is connected to the suction channel end area via a plurality of flow openings. The flow openings preferably flow into the suction mouth one behind the other in relation to a longitudinal direction of the suction mouth, so that several flow components flow separately into the suction channel end region and add up therein in the manner of a cascade. Contrary to the state of the art, air does not only flow through a single flow opening into the end area of the suction channel. Rather, the suction air is split up into a plurality of flow components, which arrive on different flow paths, starting from the suction mouth and into the suction channel end area. The flow openings can be placed and designed on the end area of the suction channel in such a way that a homogeneous suction air intensity is available along the suction mouth. Within the suction channel end area, a flow component entering through a flow opening that is furthest away from the suction channel flows past the other flow openings that are formed on the suction channel end area between the most distant flow opening and the suction channel leading in the direction of the fan. The end region of the suction channel is thus formed along the suction mouth in the manner of a collecting channel, which serves as an intermediary between the suction channel leading to the blower and the suction mouth. The intensity of the suction air flow at each flow opening can be influenced separately by the number, arrangement and size of the flow openings, including the inflow cross sections within the end area of the suction channel. The end region of the suction channel formed in this way enables an asymmetrical connection of the suction channel to the suction mouth, as a result of which there is greater flexibility with regard to the geometric design of the suction nozzle and the available installation space.

It is provided that the suction channel end area arranged between the suction mouth and the suction channel is arranged parallel along the suction mouth. According to the invention here is a terminal Connection of the suction channel end area proposed to the suction channel, so that the suction channel end area is an end extension of the suction channel. If the suction channel end area is an element formed separately from the suction channel, the suction channel can have a connection area for, for example, a detachable connection to the suction channel end area. The end region of the suction channel is fluidically connected to the suction mouth by means of the plurality of flow openings, the flow openings preferably being arranged in such a way that the suction air intensity is also optimal in the edge regions of the suction mouth.

Furthermore, it is proposed that the suction channel end region has an elongated shape, with the flow openings opening into the suction mouth one behind the other in relation to a longitudinal direction of the suction mouth. A surface normal of an opening plane of the flow opening can preferably be oriented perpendicularly to the longitudinal extent of the suction channel end region. Since the suction nozzle of a vacuum cleaning device has an elongated suction mouth, the length of which is oriented transversely to a main direction of movement of the vacuum cleaning device or the suction nozzle, it is recommended that the suction channel end area opening into the suction mouth also has an elongated shape. The flow openings connecting the suction channel end area to the suction mouth are oriented in such a way that the surface normals of the opening planes are each perpendicular to the longitudinal extension of the suction channel end area. According to the invention, the end area of the suction channel is arranged above the suction mouth and parallel to it, based on a normal orientation of the suction nozzle during cleaning operation.

Furthermore, it is proposed that the flow openings have opening planes with different sizes and/or different shapes have cross-sectional areas. Due to the size and shape of the flow openings, the intensity of the suction air flow can be adjusted separately at each flow opening. The sizes of the flow openings differ depending on the pressure loss to be expected within the suction channel end area. In particular, the flow openings must be designed in such a way that they ensure the uniform distribution of the suction air intensity within the suction mouth.

According to a preferred embodiment, it is proposed that the flow opening is part of a nozzle. According to this embodiment, the suction channel end area is connected to the suction mouth via a plurality of nozzles, so that a speed and/or direction of the flow is determined by the shape and size of the nozzle in addition to other factors such as the size of the cross-sectional area. The shape and size of the nozzle can be varied in practice in order to achieve a uniform suction air intensity via the suction mouth.

In this context, it can be provided that the nozzles provide flow paths of different lengths between the suction channel end area and the suction mouth. The nozzles can thus be of different lengths in relation to one another. As a result, the pressure loss achieved at the respective nozzle or flow opening can also be set individually.

It is also recommended that the end area of the suction channel tapers in the direction of its longitudinal extension counter to the direction of flow. According to this embodiment, the suction channel end area has successive flow cross sections that become smaller along its longitudinal extension, so that the suction channel end area becomes smaller, starting from a blower, up to the most remote flow opening. the respective Inflow paths of the flow openings thus assume a cascade-like arrangement.

According to a special embodiment, it is proposed that the suction channel has two suction channel end regions connected in parallel in terms of flow. In particular, the longitudinal extensions of the two suction channel end regions can be oriented parallel to one another. According to this embodiment, each of the two end regions of the suction channel preferably opens into its own suction mouth. The end regions of the suction channel can be arranged at a distance from one another in a housing of the suction nozzle. The suction nozzle can have, for example, a first suction mouth which leads in relation to a usual forward movement of the suction nozzle during a cleaning operation, and a second suction mouth which leads in relation to a movement in the opposite rearward direction thereto. Thus, the suction nozzle enables an equally optimal cleaning result in both opposite directions.

Furthermore, it is proposed that the suction channel end area has two to ten, in particular three to five, flow openings. The more flow openings are formed in the suction channel end area, the finer the suction air intensity can be set at the suction mouth. It is advisable to provide more flow openings the longer the suction mouth is.

Finally, it can be provided that a pressure loss caused by a flow opening is at least five times, in particular at least ten times, greater than a pressure loss within the suction port end area. In order to achieve a homogeneous volume flow at all flow openings, defined sizes of the cross-sectional areas of the flow openings are required and specific sizes of the flow cross-sections within the end area of the suction channel are required. The flow cross sections within the suction channel end area are the cross sections which are oriented essentially perpendicular to a main flow direction. For the design of the flow cross sections, it is recommended that the pressure losses in the suction channel end area are at least five times smaller, but particularly preferably ten times smaller, than the pressure losses through the individual flow openings. In other words, the flow openings must cause a pressure loss that is at least five times, particularly preferably at least ten times, greater in order to ensure the uniform distribution of the suction air intensity at the suction mouth.

In addition to the suction nozzle described above, the invention also proposes a vacuum cleaning device with a suction nozzle described above.

The suction cleaning device according to the invention can, for example, be a device used exclusively for suction cleaning, or alternatively also a combined suction-wiping device or another cleaning device with a suction function. The suction nozzle can be arranged separably on a base unit of the vacuum cleaning device, or it can also be an integral part of the vacuum cleaning device. The suction nozzle of the vacuum cleaning device according to the invention is preferably designed with one or more of the features explained above. The resulting advantages also apply accordingly to the vacuum cleaning device according to the invention.

Brief description of the drawings

Fig. 1

ein erfindungsgemäßes Saugreinigungsgerät mit einer Saugdüse;

Fig. 2

einen Teilbereich des Saugreinigungsgerätes mit der Saugdüse in einer frontalen Ansicht;

Fig. 3

eine Ansicht von oben in die Saugdüse, skizziert;

Fig. 4

eine Explosionsdarstellung der Saugdüse;

Fig. 5

einen Teilbereich des in Fig. 3 dargestellten Saugkanalendbereiches;

Fig. 6

einen Teilbereich des in Fig. 3 dargestellten Saugkanalendbereiches aus einer anderen Perspektive;

Fig. 7

eine Unteransicht eines Teilbereiches des in Fig. 3 dargestellten Saugkanalendbereiches.

The invention is explained in more detail below using exemplary embodiments. Show it:

1

a vacuum cleaning device according to the invention with a suction nozzle;

2

a partial area of the vacuum cleaning device with the suction nozzle in a frontal view;

3

a top view of the suction nozzle, outlined;

4

an exploded view of the suction nozzle;

figure 5

a part of the in 3 shown Saugkanalendbereiches;

6

a part of the in 3 shown Saugkanalendbereichs from a different perspective;

7

a bottom view of a portion of the in 3 shown suction channel end area.

Description of the embodiments

figure 1 shows a vacuum cleaning device 2, which is designed here as a hand-held device with a base unit 14 and a suction nozzle 1. The suction nozzle 1 is arranged separably on the base unit 14 in the manner of an attachment. The base device 14 has a handle 16 which is designed to be telescopic, so that a user of the vacuum cleaning device 2 can adjust the length of the handle 16 to his height. Furthermore, a handle 17 is arranged on the handle 16, by means of which the user can guide the vacuum cleaning device 2 during normal working operation, ie push it over a surface to be cleaned. During operation, the user usually moves the vacuum cleaning device 2 in opposite directions over the surface to be cleaned. He alternately pushes the vacuum cleaning device 2 away from him or pulls it towards himself. A switch 18 is arranged on the handle 17 and is used, for example, to switch a motor of a motor-fan unit of the vacuum cleaning device 2 on and off.

The suction nozzle 1 has a housing 19 with a connection area 20 to which the base unit 14 of the vacuum cleaning device 2 can be connected. A suction channel 3 is guided within the housing 19 and provides a flow connection to the motor/fan unit of the vacuum cleaning device 2 . The suction channel 3 has here, for example, two suction channel end regions 4, 5, which are each connected to a suction mouth 6. In the figure 1 The illustrated front side of the housing 19 has, for example, a bristle strip 15 as a sealing element in the area of the suction mouth 6 .

figure 2 shows a front view of the suction nozzle 1. The suction channel end area 4, which is arranged at the front in the housing 19 in the illustration, has here, for example, a total of three flow openings 7, 8, 9, which fluidically connect the suction channel end area 4 to the suction mouth 6. The flow openings 7 , 8 , 9 are each part of a nozzle 13 , which spaces the end area of the suction channel from the suction mouth 6 . The nozzles 13 here provide, for example, flow paths of different lengths for the flow portions flowing through the nozzles 13 . Alternatively, the nozzles 13 can also be of the same length.

figure 3 shows a section through the suction nozzle 1 according to FIG figure 2 shown line III. The suction nozzle 1 has the two suction channel end regions 4 , 5 oriented parallel to one another, which are connected to the suction channel 3 via a common connection region 21 . The suction channel end regions 4, 5 each form a distribution channel for the respective associated suction mouth 6. There is a flow connection between the suction channel end region 4 and the associated suction mouth 6 via the flow openings 7, 8, 9, or via the flow openings 10, 11, 12 a flow connection between the suction channel end area 5 and the associated suction mouth 6. The flow openings 7, 8, 9 or 10, 11, 12 have cross-sectional areas of different sizes, with the flow opening 8 or 11 arranged centrally in the respective suction channel end area 4, 5 having a larger cross-sectional area than the other flow openings 7, 9 or 10, 12. The flow openings 10, 11, 12 of the second suction channel end area 5 can either be dimensioned analogously to the flow openings 7, 8, 9 of the first suction channel end area 4 or deviate from them.

The cross-sectional areas of the flow openings 7, 8, 9, 10, 11, 12 have the following sizes, for example: Flow opening 7: 191mm ² Flow opening 8: 359mm ² Flow opening 9: 179mm ² Flow opening 10: 180.5mm ² Flow opening 11: 359mm ² Flow opening 12: 163.5mm ² .

figure 4 shows a roughly sketched exploded view of a suction nozzle 1. The suction nozzle 1 has a lower and an upper partial housing area as well as the suction channel end areas 4, 5 lying in between, with the respective associated suction mouth 6. The suction channel end areas 4 , 5 are brought together at a common connection area 21 which is used for connection to the suction channel 3 .

the figures 5 and 6 show two different perspective views of the suction channel end regions 4, 5, wherein figure 5 shows a view of the first suction channel end region 4 and wherein figure 6 shows a view of the second suction channel end area 5 . The suction channel end regions 4, 5 have shapes that change along their respective longitudinal extent, which provide end region cross sections 22 to 30 of different sizes for the flow components flowing through the suction channel end regions 4, 5. Starting from the connection area 21 to the flow opening 7, 10 which is furthest away in the respective suction channel end area 4, 5, the end area cross sections 26 to 22 and 27 to 30 have decreasing surface sizes. Here, the end area cross sections 22 to 30 have the following sizes, for example: End area cross section 22: 162.5mm ² End area cross section 23: 448.5mm ² End area cross section 24: 448.5mm ² End area cross section 25: 579mm ² End area cross section 26: 608mm ² End area cross section 27: 814.5mm ² End area cross section 28 547.5mm ² End area cross section 29: 410.5mm ² End Section Cross Section 30: ^207mm2 .

The ratio between the pressure losses in the suction channel end regions 4, 5 and the pressure losses of the flow openings 7, 8, 9 or 10, 11, 12 is approximately 1:5 here, the pressure loss of the flow openings 7 to 9 being approximately 700 Pa and the pressure loss in the suction channel end area 4, 5 approximately 150 Pa, with a volume flow of 16 1/s distributed over the three flow openings 7, 8, 9 or 10, 11, 12. The flow openings 7 to 12 thus have a pressure loss which is approximately five times greater is than the pressure loss in the suction channel end area 4, 5. This design enables a suction air intensity within the suction mouth 6 which is distributed more homogeneously over the suction mouth 6 than would be the case if the suction channel end area 4, 5 was only connected to the suction mouth 6 at the end.

figure 7 finally shows a bottom view of the in figure 5 Suction channel end region 4 shown at the front with the three flow openings 7, 8, 9.

The inventive design of a suction channel end area 4, 5 as a distribution channel between the connection area 21 and several flow openings 7 to 9 or 10 to 12 pointing to the respective suction mouth 6 allows a homogeneous suction air intensity to be achieved at the suction mouth 6. The air sucked in through the suction mouth 6 flows through the flow openings 7 to 9 or 10 to 12 into the suction channel end area 4 or 5 that a portion of the flow flowing through the flow opening 7 or 10 that is furthest away from the connection area 21 into the suction channel end area 4 or 5 flows past the adjacent flow openings 8, 9 or 11, 12, so that cascading flow paths flow in the direction of the connection area 21 result. In combination with the suction channel end areas 4, 5 tapering in the direction of the most remote flow openings 7, 10 and their end area cross sections 22 to 30 and the sizes of the flow openings 7 to 12, this enables an individual design of the suction channel end areas 4, 5, so that depending on the shape and Size of the available space in the housing 19 of the suction nozzle 1, a homogeneity of the suction air intensity at the suction mouth 6 can be achieved. <b>List of reference characters</b> 1 suction nozzle 26 tail section cross-section 2 suction cleaning device 27 tail section cross-section 3 suction channel 28 tail section cross-section 4 suction channel end area 29 tail section cross-section 5 suction channel end area 30 tail section cross-section 6 suction mouth 7 flow opening 8th flow opening 9 flow opening 10 flow opening 11 flow opening 12 flow opening 13 jet 14 base unit 15 bristle bar 16 stalk 17 Handle 18 Switch 19 Housing 20 connection area 21 connection area 22 tail section cross-section 23 tail section cross-section 24 tail section cross-section 25 tail section cross-section

Claims (10)

1. Suction nozzle (1) for a suction cleaning device (2), the suction nozzle (1) having a suction channel (3) for connection to a fan of a suction cleaning device (2), a suction channel end region (4, 5) of the suction channel (3) opening into an elongate suction mouth (6), the longitudinal extension of which is oriented transversely to a main direction of movement of the suction nozzle (1), the suction channel end region (4, 5) having a plurality of flow openings (7, 8, 9, 10, 11, 12) opening into the suction mouth (6) which are connected in a cascade form such that a first flow portion, flowing from the suction mouth (6) through a first flow opening (7, 10) into the suction channel end region (4, 5), flows, inside the suction channel end region (4, 5), past a second flow opening (8, 9, 11, 12) of the suction channel end region (4, 5), the first flow portion and a second flow portion that flows through the second flow opening (8, 9, 11, 12) into the suction channel end region (4, 5) combining, characterised in that the suction channel end region (4, 5) is an end extension of the suction channel (3), the suction channel end region (4, 5) being arranged, with respect to the orientation of the suction cleaning device (2) when in a conventional use position, in a viewing direction in parallel with a surface to be cleaned and transverse to a longitudinal extension of the suction mouth (6), above the suction mouth (6) and in parallel along the suction mouth (6) between the suction mouth (6) and the suction channel (3), the suction channel (3), with respect to the viewing direction, being non-centrally connected to the suction mouth (6) and on one side being associated with an end region of the suction mouth (6), the suction channel end region (4, 5) allowing asymmetrical connection of the suction channel (3) to the suction mouth (6).
2. Suction nozzle (1) according to claim 1, characterised in that the suction channel end region (4, 5) has an elongate shape, the flow openings (7, 8, 9, 10, 11, 12), with respect to the longitudinal direction of the suction mouth (6), opening one behind the other into the suction mouth (6).
3. Suction nozzle (1) according to either claim 1 or claim 2, characterised in that the flow openings (7, 8, 9, 10, 11, 12) have opening planes having cross-sectional areas of different sizes and/or different shapes.
4. Suction nozzle (1) according to any of the preceding claims, characterised in that the flow opening (7, 8, 9, 10, 11, 12) is part of a nozzle (13).
5. Suction nozzle (1) according to claim 4, characterised in that the nozzles (13) provide flow paths of different lengths between the suction channel end region (4, 5) and the suction mouth (6).
6. Suction nozzle (1) according to any of the preceding claims, characterised in that the suction channel end region (4, 5) tapers in the direction of its longitudinal extension counter to the flow direction.
7. Suction nozzle (1) according to any of the preceding claims, characterised in that the suction channel (3) has two suction channel end regions (4, 5) connected in parallel in terms of flow, the longitudinal extensions of which are oriented in particular in parallel with one another.
8. Suction nozzle (1) according to any of the preceding claims, characterised in that the suction channel end region (4, 5) has two to ten, in particular three to five, flow openings (7, 8, 9, 10, 11, 12).
9. Suction nozzle (1) according to any of the preceding claims, characterised in that a pressure loss caused by a flow opening (7, 8, 9, 10, 11, 12) is at least five times, in particular at least ten times, as great as a pressure loss within the suction channel end region (4, 5).
10. Suction cleaning device (2) having a suction nozzle (1) according to any of the preceding claims.

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