EP3525647B1 - Cleaning device and method for producing a cleaning device - Google Patents

Description

The invention relates to a cleaning device, comprising at least one noise source and an air guiding device with at least one flow deflection element, the at least one flow deflection element having a first arm with an inlet pipe and a second arm with an outlet pipe, the outlet pipe being oriented transversely to the inlet pipe, the inlet pipe having a The inlet has an extension in a first depth direction and in a first width direction, the outlet pipe has an outlet with a depth in a second depth direction and a width in a second width direction, the first depth direction and the second depth direction are oriented parallel to one another, and the first Width direction and the second width direction are oriented transversely to one another.

The invention also relates to a method for producing a cleaning device, comprising at least one noise source and an air guiding device with at least one flow deflection element, the at least one flow deflection element having a first arm with an inlet pipe and a second arm with an outlet pipe, the outlet pipe being oriented transversely to the inlet pipe the inlet pipe has an inlet with an extension in a first depth direction and in a first width direction, the outlet pipe has an outlet with a depth in a second depth direction and a width in a second width direction, the first depth direction and the second depth direction oriented parallel to one another are, and the first width direction and the second width direction are oriented transversely to one another.

From the WO 2015/043641 A1 a suction device is known, comprising a blower device for generating a suction air flow and an air guiding device which has at least one flow deflection element with an inlet pipe and an outlet pipe, the outlet pipe is oriented transversely to the inlet pipe. A sound mirror device, on which sound is reflected and / or sound is absorbed, is arranged at a transition area between the inlet pipe and the outlet pipe.

From the not previously published international application PCT / EP2016 / 050277 of January 8, 2016 a cleaning device is known, comprising at least one noise source with a noise emission in a frequency range below 2000 Hz and at least one perforated plate resonator, which is assigned to the at least one noise source.

From the EP 1 559 359 A2 a vacuum cleaner is known in which a suction unit is surrounded in the circumferential direction by two semicircular outlet channels which open into a common outlet opening for discharging the suction air sucked in by the suction unit.

From the JP 2005-352188 there is known a noise reduction mechanism for a pipe.

The invention is based on the object of providing a cleaning device of the type mentioned at the outset, in which an effective noise reduction can be achieved.

In the cleaning device mentioned at the outset, this object is achieved according to the invention in that the width is at least 1.2 times the depth.

According to the invention, it is provided that the at least one flow deflection element is designed to be "flat" in relation to its depth.

It has been shown that with such a flat design on the outlet pipe, in which the width is at least 1.2 times the depth at the outlet, increased transmission losses are achieved for a sound level and thus an effective noise reduction takes place. For example, noise reductions of 8 dB (A) have been achieved with acceptable pressure losses.

This effect is due to the fact that a fundamental mode entering the inlet pipe excites transverse modes in the outlet pipe, which have a large number of transmission loss peaks in the frequency spectrum with a large width, and this leads to an effective noise reduction.

The corresponding flow deflection element can be installed in a large number of applications. For example, it can be installed in a guide device for exhaust air in a suction device or in a guide device for cleaning air for a filter device of a suction device. It can also be installed, for example, in a cooling air duct of a cleaning device.

In particular, the second depth direction and the second width direction are oriented transversely and preferably perpendicular to one another.

The inlet pipe and the outlet pipe are oriented transversely to one another. For example, they can be oriented at an angle of 90 ° ± 20 ° to one another. In one embodiment, the first width direction and the second width direction are perpendicular to one another. This results in an effective noise reduction.

The width and the depth at the outlet advantageously relate to a rectangular envelope which has sides with an extension in the second depth direction and the second width direction. The noise reduction effect can be achieved if there is a rectangular cross-sectional area at the outlet (in which case an outline of the cross-sectional area is the envelope), or if the cross-sectional area is not rectangular but has a rectangular envelope. With regard to the rectangular envelope the width and depth are then measured for the ratio (which is at least 1.2).

It can also be provided that the inlet has a rectangular envelope, which has sides that extend in the first depth direction and the first width direction. The cross-sectional area at the inlet can be rectangular or can have a different shape.

It is favorable if the ratio of the width to the depth (at the outlet) is at least 1.5: 1 and in particular at least 2: 1 and in particular at least 3: 1 and in particular at least 4: 1 and in particular at least 5: 1. Basically, the higher this ratio of width to depth, the more effective the noise reduction. A very effective noise reduction results, for example, from a ratio of 2: 1.

It is possible here for the outlet pipe to have the same cross section from the outlet to a connection area with the inlet pipe.

Furthermore, it can be provided that the inlet pipe has the same cross section from the inlet to a transition region to the outlet pipe. A uniform flow velocity in a flow deflecting element can be achieved in a simple manner by appropriately designing the inlet pipe and the outlet pipe.

It is favorable if the inlet pipe at the inlet has the same hydraulic cross-sectional area as the outlet pipe at the outlet and in particular the cross-sectional area at the inlet has the same shape as the cross-sectional area at the outlet. This ensures that there is a uniform flow velocity during the flow. The hydraulic cross-sectional area results from the hydraulic cross-section D _H as π · D _H ^2/4 . The hydraulic cross-section D _H results in turn as the ratio of four times an (actual) cross-sectional area perpendicular to the main flow direction to the circumference of this cross-sectional area.

It can be provided that an outlet of the outlet pipe forms an opening into the surroundings of the cleaning device or the outlet of the outlet pipe is connected in a flow-effective manner to an opening into the surroundings. In this way, for example, the flow deflection element can bring about a “last deflection” for air before it is released to the environment.

As an alternative or in addition, it is also possible that the inlet of the inlet pipe forms an orifice which is in flow-effective connection with the noise source or with a sound generator coupled to the noise source. For example, exhaust air which is emitted directly from a fan device to a suction fan device can be coupled into the inlet of a flow deflection element in order to achieve efficient flow guidance with effective noise reduction.

It is favorable if a hydraulic cross-sectional area of the at least one flow deflection element between the inlet and the outlet is at least approximately constant, at least outside of a transition area between the inlet pipe and the outlet pipe. This allows pressure losses to be minimized. A uniform flow velocity can be achieved.

In one embodiment, an area or sub-area of the inlet pipe with a rectangular cross-sectional area and an area or sub-area of the outlet pipe with a rectangular cross-sectional area adjoin one another and at least at the ends of a transition area between the inlet pipe and the outlet pipe, the cross-sectional areas are the same (and thereby rectangular). This results in a simple design.

In a further exemplary embodiment, the first arm has a non-rectangular cross-sectional area in a partial area with a first transition area to a rectangular cross-sectional area and / or the second arm has a partial area with a non-rectangular cross-sectional area with a second transition area to a rectangular cross-sectional area. As a result, with effective noise reduction, for example, it can be easily connected to an application. The first transition area or second transition area can, for example, have a circular cross-sectional area.

In an alternative embodiment, the inlet pipe at the inlet and / or the outlet pipe at the outlet has a rectangular cross-sectional area. This can be advantageous for certain applications. There is then no need to provide a transition area, rather the rectangular cross-sectional areas are then already formed at the inlet and / or outlet.

However, it can also be provided that the inlet pipe at the inlet and / or the outlet pipe at the outlet has a non-rectangular cross-sectional area. This can for example be oval or elliptical, can have an outer contour in the shape of a figure eight or the like.

It is favorable if the inlet pipe and the outlet pipe are oriented perpendicular to one another and / or the inlet of the inlet pipe has an opening surface with a first normal vector and the outlet of the outlet pipe has an opening surface with a second normal vector, the first normal vector and the second normal vector being perpendicular to stand by each other. If the inlet pipe and the outlet pipe are perpendicular to one another, there is an effective noise reduction by correspondingly influencing transverse modes, which are excited in the outlet pipe by an incoming basic mode.

It is favorable if the inlet pipe and the outlet pipe have a common edge at an external angular region, which edge extends in the first depth direction. This edge has in particular the first depth.

It can be provided that the edge is arranged in a trough in relation to an interior space of the flow deflecting element. The trough can form a sound trough for additional noise reduction. It will refer to the in this context WO 2015/043641 A1 referenced.

It is then favorable if a first wall of the inlet pipe and a second wall of the outlet pipe are oriented at an angle between 60 ° and 90 ° to one another at the edge at the outer angle region. If these are oriented at an angle of 90 ° to one another, no sound trough is formed. If this angle is between 60 ° and less than 90 °, then a sound trough is formed, the depth of which depends on the angle.

It is advantageous if a transition area between the inlet pipe and the outlet pipe has a wall that is curved in relation to the first depth direction at an interior angle area. Such a curved wall is in particular free of edges. Such a curved wall is important for flow guidance. A pressure loss can be kept low by the flow deflection. It is referred to in this context to the WO 2015/043641 A1 referenced.

In particular, the curved wall lies opposite a common edge of the inlet pipe and the outlet pipe. In this way, an effective noise reduction can be achieved with good pressure loss values.

In particular, an inner radius on the curved wall is greater than half the hydraulic diameter of the inlet pipe. This results in a minimization of pressure losses when the flow is deflected. In this way, with great acoustic effectiveness in terms of noise reduction, a flow deflection can be achieved with minimized pressure loss. It is referred to in this context to the WO 2015/043641 A1 referenced.

In one embodiment, the air guide device is a guide device for cooling air. Basically, such a guide device for cooling air, sound can be emitted to the outside. If a corresponding flow deflection element is arranged on this air guiding device, an effective noise reduction can be achieved.

It is alternatively or additionally possible that the air guide device is a guide device for process air. For example, exhaust air from a suction unit device of a suction device is process air in this sense. It can also be a guide device for cleaning air for a filter device of a suction device process air.

In one embodiment, the cleaning device is a suction device. By providing one or more flow deflection elements, an effective noise reduction can be achieved.

In particular, the air guide device is a guide device for exhaust air from a suction unit device. A fan device of a suction unit device emits exhaust air (clean air), which must be discharged to the outside. This air can be the propagation medium for sound. By arranging one or more flow deflection elements of such a guide device, an effective noise reduction can be achieved in that the sound emission to the outside is reduced.

In one embodiment, the guide device for exhaust air has at least one path on which the at least one flow deflecting element is arranged, the at least one path in particular being curved. Such a curved path is for example in the EP 1 559 359 A2 described. For example, exhaust air can then be discharged in a defined manner via several channels.

It can then be advantageous if a first flow deflecting element and a second flow deflecting element are arranged symmetrically and in particular mirror-symmetrically to the suction unit device. Thereby a relatively high volume flow can be discharged via at least two channels, with an effective noise reduction being achieved.

In one embodiment, the at least one flow deflection element is arranged in such a way that the outlet pipe points in the direction of a base when the suction device is set up on the base for proper operation. This results in effective process air removal with an effective noise reduction and a compact design.

It can also be provided that the at least one flow deflection element is arranged at the inlet of the guide device for exhaust air in relation to the suction unit device and / or is arranged at the outlet for exhaust air for discharge to the environment.

It is also possible for the air guide device to be a guide device for cleaning air for cleaning a filter device of the suction device.

It is also possible that the cleaning device is designed as a high-pressure cleaner and that the at least one flow deflection element is arranged, for example, on a guide device for cooling air.

According to the invention, a method is provided in which, for a predetermined volume flow through the air guiding device, the at least one flow deflection element is dimensioned such that the width at the outlet is at least 1.2 times the depth.

In order to be able to guide a predetermined volume flow through the at least one flow deflection element, the cross-sectional area is defined. An effective noise reduction can be achieved if (in relation to a rectangular envelope) a width at the outlet is at least 1.2 times a depth.

This flat design of the at least one flow deflection element makes it possible to achieve an effective noise reduction.

The method according to the invention has the advantages already explained in connection with the cleaning device according to the invention.

Figur 1

eine perspektivische Teil-Darstellung eines Sauggeräts als Ausführungsbeispiel eines Reinigungsgeräts;

Figur 2

eine andere Ansicht des Reinigungsgeräts gemäß Figur 1;

Figur 3

eine ähnliche Ansicht wie Figur 1, wobei weitere Teile des Reinigungsgeräts entfernt sind;

Figur 4

eine perspektivische Darstellung eines Ausführungsbeispiels eines Strömungsumlenkungselements;

Figur 5

eine Schnittansicht des Strömungsumlenkungselements gemäß Figur 4;

Figur 6

eine perspektivische Darstellung eines weiteren Beispiels eines Strömungsumlenkungselements;

Figur 7

eine Darstellung des Transmissionsverlusts in dB(A) und des Druckverlusts für Strömungsumlenkungselemente mit verschiedenen Verhältnissen der Breite B zur Tiefe T;

Figur 8(a), (b), (c)

schematisch den Verlauf des Schalldrucks bei einem Strömungsumlenkungselement gemäß Figur 4 für verschiedene Frequenzen;

Figur 9(a)

ein Transmissionsverlust in dB(A) für Strömungsumlenkungselemente gemäß Figur 4 einer bestimmten Breite in Abhängigkeit der Frequenz;

Figur 9(b)

Transmissionsverlust in Abhängigkeit der Frequenz für ein Strömungsumlenkungselement gemäß Figur 4, aber mit einer größeren Breite (bei gleicher Tiefe) im Vergleich zur Figur 9(a);

Figur 10

eine schematische Teildarstellung eines Ausführungsbeispiels eines weiteren Reinigungsgeräts (eines Sauggeräts);

Figur 11

eine schematische Teildarstellung eines weiteren Reinigungsgeräts (eines Hochdruckreinigers);

Figur 12

eine perspektivische Darstellung eines weiteren Ausführungsbeispiels eines Strömungsumlenkungselements;

Figur 13

eine perspektivische Darstellung eines weiteren Ausführungsbeispiels eines Strömungsumlenkungselements;

Figur 14

eine perspektivische Darstellung eines weiteren Ausführungsbeispiels eines Strömungsumlenkungselements; und

Figur 15

eine perspektivische Darstellung eines weiteren Ausführungsbeispiels eines Strömungsumlenkungselements.

The following description of preferred embodiments is used in conjunction with the drawings to explain the invention in greater detail. Show it:

Figure 1

a perspective partial representation of a suction device as an embodiment of a cleaning device;

Figure 2

another view of the cleaning device according to Figure 1 ;

Figure 3

a view similar to Figure 1 with further parts of the cleaning device removed;

Figure 4

a perspective view of an embodiment of a flow deflection element;

Figure 5

a sectional view of the flow deflection element according to Figure 4 ;

Figure 6

a perspective view of a further example of a flow deflection element;

Figure 7

a representation of the transmission loss in dB (A) and the pressure loss for flow deflection elements with different ratios of the width B to the depth T;

Figure 8 (a), (b), (c)

schematically the course of the sound pressure in a flow deflection element according to FIG Figure 4 for different frequencies;

Figure 9 (a)

a transmission loss in dB (A) for flow deflection elements according to Figure 4 a certain width depending on the frequency;

Figure 9 (b)

Transmission loss as a function of the frequency for a flow deflection element according to FIG Figure 4 , but with a greater width (with the same depth) compared to Figure 9 (a) ;

Figure 10

a schematic partial representation of an embodiment of a further cleaning device (a suction device);

Figure 11

a schematic partial representation of a further cleaning device (a high-pressure cleaner);

Figure 12

a perspective view of a further embodiment of a flow deflection element;

Figure 13

a perspective view of a further embodiment of a flow deflection element;

Figure 14

a perspective view of a further embodiment of a flow deflection element; and

Figure 15

a perspective view of a further embodiment of a flow deflection element.

One embodiment of a cleaning device is a suction device, which is in the Figures 1 to 3 is shown in a partial representation and denoted by 10.

The suction device 10 comprises a suction container 12 on which a wheel device 14 is arranged. The suction device 10 can be set up on a base 16 via the wheel device 14.

A connection 18 for a suction hose is arranged on the suction container 12.

The suction device 10 has a suction head 20, which in the Figures 1 to 3 is shown in a partial representation.

The suction head 20 is detachably positioned on the suction container 12.

A suction unit device 22 is arranged in the suction head 20. The suction unit device 22 comprises a fan 24 for generating a (negative pressure) suction flow and a motor and in particular an electric motor.

The suction device 10 has a filter device via which an interior space 26 can be acted upon by a suction flow which is generated by the suction unit device 22. Accordingly, the suction device 10 has a dirt side which faces the interior space 26, and a clean side which faces the suction head 20.

The suction device 10 has an air guiding device 28 which is arranged on the suction head 20. The air guiding device 28 guides process air. The air guide device 28 on the suction head 20 guides exhaust air (clean air) from the suction unit device 22 via the air guide device 28 as a guide device 30 for exhaust air, this exhaust air can be emitted to an environment around the suction device 10 (to an outside space in relation to the suction device 10).

The suction unit device 22, which is arranged on the suction head 20, is arranged in a region 33 which has at least approximately a circular cross-sectional area.

This area 33 is delimited by a first wall 34 and an opposite second wall 36. Both the first wall 34 and the second wall 36 are curved.

A first wall part 38 adjoins the first wall 36 and a second wall part 40 on the opposite side. The first wall part 38 and the second wall part 40 are connected to the first wall 34.

A first wall part 42 and a second wall part 44 adjoin the second wall 36. The first wall part 42 and the second wall part 44 are spaced apart from one another. Both the first wall part 42 and the second wall part 44 are connected to the second wall 36.

The first wall part 38 of the first wall 34 and the first wall part 42 of the second wall 36 are spaced apart from one another. They are aligned at least approximately parallel to one another. A first channel 46 is formed between them. This first channel 46 is closed at the bottom towards the suction container 12 and at the top in the opposite direction. (Due to the partial representation in Figure 1 to 3 the closed formation at the top is not shown.)

A second channel 48 is formed between the second wall part 40 of the first wall 34 and the second wall part 44 of the second wall 36. The second wall parts 40 and 44 are at least approximately parallel to one another. They are spaced from each other around the second Form channel 48. The second channel 48, like the first channel 46, is closed at the top and bottom.

The second channel 48 is aligned at least approximately parallel to the first channel 46.

The first channel 46 has a first opening 50, via which it opens into the area 33. The second channel 48 has a second opening 52 via which it opens into the area 33.

The guide device 30 for exhaust air is formed via the first channel 46, the second channel 48 and the region 33, which guide device correspondingly has a guide path for exhaust air with a curved region (on the region 33).

The first channel 46 and the second channel 48 are arranged and designed at least approximately mirror-symmetrically to the suction unit device 22. A corresponding mirror plane 54 runs centrally through the suction unit device 22. In particular, a normal of the mirror plane 54 is oriented parallel to a wheel axis 56 of a rear wheel 58 of the wheel device 14. In particular, the mirror plane 54 is oriented perpendicular to the base 16 when the suction device 10 is set up on the base 16 via the wheel device 14.

At the end of the first channel 46 and the second channel 48, a flow deflection element 60 is arranged in each case. The corresponding flow deflection elements 60 on the first channel 46 and the second channel 48 are in the areas designated by A ₁ and A _{2 in} FIG Figures 1 to 3 arranged. In principle, the flow deflecting elements 60 on the first channel 46 and the second channel 48 are of identical design.

The corresponding flow deflecting elements 60 (a first flow deflecting element and a second flow deflecting element) are (mirror) symmetrical arranged with respect to the suction unit device 22 and thus the mirror plane 54.

The flow deflection elements 60 serve to deflect the flow and thereby reduce the sound emission of the suction device 10.

A first embodiment of a flow deflection element, which in the Figures 4 and 5 and is denoted there by 60 ′, comprises a first arm 61 a with an inlet pipe 62 and a second arm 61 b with an outlet pipe 64. The inlet pipe 62 has an inlet 66 which has a corresponding inlet opening 68. Air can be injected via the inlet 66. Accordingly, the outlet pipe 64 has an outlet 70 with an outlet opening 72.

The first arm 61a of the flow deflection element 60 ′ forms the inlet pipe 62. Accordingly, the inlet 66 is an inlet of the flow deflection element 60 ′. The second arm 61b is formed by the outlet pipe 64. Accordingly, the outlet 70 of the outlet pipe 64 is an outlet of the flow deflection element 60 '.

The inlet pipe 66 extends along a first axis 74. The outlet pipe 64 extends along a second axis 76. The first arm 61a and the second arm 61b are oriented transversely and in particular perpendicular to one another. An envelope of the cross-sectional area at the inlet 66 or at the outlet 70 is a rectangle, this envelope directly delimiting this cross-sectional area. The inlet pipe 62 and the outlet pipe 64 are correspondingly oriented transversely and in particular perpendicular to one another. The first axis 74 and the second axis 76 lie transversely and in particular perpendicular to one another.

The inlet pipe 62 and the outlet ear 64 meet in an external angular region 78 at an edge 80. They also meet at an interior angle area 82 on top of each other. The inner angle area 82 is opposite the outer angle area 78 and in particular the edge 80.

In one embodiment, it is provided that there is an edge-free transition from the inlet pipe 62 into the outlet pipe 64 at the inner angular region 82. Correspondingly, the flow deflecting element 60 ′ has a transition region 84 at the inner angular region 82 from the inlet pipe 62 into the outlet pipe 64, which ensures a transition without edges.

The flow deflection element 60 ′ has the same hydraulic cross-sectional area at the inlet 66 and the outlet 70. In particular, at least outside of the transition region 84, the hydraulic cross-sectional area is at least approximately constant over a flow length of the flow deflection element 60 '(over the flow guide between the inlet 66 and the outlet 70) in order to enable a corresponding volume throughput.

In one embodiment, the flow deflecting element 60 ′ has a rectangular cross-sectional area at least outside of the transition region 84 over its entire flow length. In particular, the inlet pipe 62 has the same cross-sectional area from the inlet 66 to the transition region 84. Furthermore, the outlet pipe 64 has the same cross-sectional area from an outlet 70 to the transition region 84.

In the embodiment of the flow deflecting element 60 '( Figures 4 and 5 ) The cross-sectional area which is oriented perpendicular to the first axis 74 on the inlet pipe 62 and is oriented perpendicular to the second axis 76 on the outlet pipe 64 is rectangular.

At the inlet pipe 62, the (inner) cross-sectional area has a first depth T ₁ in a first depth direction 86 and a first width B ₁ in a first width direction 88 perpendicular to the first depth direction 86. The first The depth direction 86 and the first width direction 88 are each oriented perpendicular to the first axis 74.

The outlet pipe 64 has (outside of the transition region 84) a second depth T ₂ in a second depth direction 90 and a second width B ₂ in a second width direction 92. The second depth direction 90 and the second width direction 92 are perpendicular to one another. The second depth direction 90 and the second width direction 92 are oriented perpendicular to the second axis 76 of the outlet pipe 64.

In particular, the first width B ₁ and the second width B _{2 have} the same size (B). Furthermore, in particular the first depth T ₁ and the second depth T _{2 have} the same size (T).

The first width direction 88 and the second width direction 92 are transverse and in particular perpendicular to one another. The first depth direction 86 and the second depth direction 90 are parallel to one another.

Correspondingly, the edge 80, which is oriented along the first depth direction 86 or along the second depth direction 90 (and thus transversely to the first width direction 88 and the second width direction 92), has the depth T ₁ = T ₂ = T.

As will be explained in more detail below, the width B ₂ and the depth T ₂ at the outlet 70 are in a specific ratio to one another, namely this specific ratio is at least 1.2: 1. (Due to the geometric design with the same rectangular cross-sectional area on the inlet pipe 62 and the outlet pipe 64, this ratio also applies to the width B ₁ and the depth T _1. )

The flow deflecting element 60 ′ has a first wall 94a and a second wall 94b opposite in parallel. The first wall 94a and the second wall 94b are spaced apart from one another in the depth direction 86 and 90, respectively.

The flow deflecting element 60 'is closed outside the inlet 66 and the outlet 70 by a first wall area 96a and by a second wall area 96b. The first wall area 96a connects the first wall 94a and the second wall 94b at the outer angle area 78 and the second wall area 96b connects the first wall 94a and the second wall 94b at the inner angle area 82.

The area of the rectangular cross-sectional area of both the inlet pipe 62 and the outlet pipe 64 outside the transition region 84 (and in particular at the inlet 66 and the outlet 70) is B ₂ x T ₂ (= B ₁ x T ₁ ).

In relation to the depth direction 86 or 90, the second wall area 96b is rounded at the transition area 84 for an edge-free design.

A corresponding inner radius R ( Figure 5 ) of an osculating circle 100 on an outside of the inner angular area 82 in the transition area 84 is larger than half the hydraulic diameter of the inlet pipe 62 (outside the transition area 84), for example at the inlet 66. The hydraulic diameter results as the ratio of four times the cross-sectional area perpendicular to Main flow direction to the circumference of the cross-sectional area.

In the present case, the hydraulic diameter is ${\mathrm{D.}}_H=\frac{2{\mathrm{B.}}_2{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="imgf0007.png"\; state="\{\{state\}\}">T</figure-callout>}}_2}{\left({\mathrm{B.}}_2+{\mathrm{<figure-callout\; id="2"\; label="T"\; filenames="imgf0007.png"\; state="\{\{state\}\}">T</figure-callout>}}_2\right)}$

The inlet opening 68 of the inlet pipe 62 has a normal vector 102. This is oriented in particular parallel or anti-parallel to the first axis 74.

The outlet port 72 has a normal vector 104. This is oriented in particular parallel or anti-parallel to the second axis 76.

The first wall region 96a has a first partial region 106a on the inlet pipe 62 and a second partial region 106b on the outlet pipe 64.

In principle, it is possible that the sub-area 106a and the sub-area 106b meet at the edge 80 with the depth D at right angles.

In one embodiment, a trough 108 is formed on the edge 80, in which the edge 80 then lies on an inner side of the flow deflection element 60 ′.

To form this depression 108, the second sub-area 106b of the second wall area 96b has a first sub-area 110a and a second sub-area 110b. The first sub-area 110a adjoins the outlet 70. The second sub-area 110b adjoins the edge 80 and the first sub-area 110a.

The first sub-region 110a is oriented parallel to the second axis 76.

The first partial area 106a of the second wall area 96b is oriented parallel to the first axis 74.

The second sub-region 110b of the second partial region 106b is oriented at an acute angle to the second axis 76 and correspondingly at an obtuse angle to the first axis 74.

An angle 112 between the first sub-area 106a of the second wall area 96b (and thus the first axis 74) and the second sub-area 110b is between 60 ° and 90 °. If this angle is 90 ° and thus the second sub-region 110b lies parallel to the second axis 76, there is none Well 108 formed. The trough is formed with a corresponding depth when the angle 112 deviates from 90 °. In particular, it should not be smaller than 60 °.

The trough 108 makes it possible to realize a sound trough through which an effective noise reduction can be brought about. It is referred to in this context to the WO 2015/043641 A1 referenced.

In the exemplary embodiment of the cleaning device 10, the respective flow deflection element 60 ′ is arranged on the suction head 20 such that the respective inlet pipe 62 is connected to the first channel 46 or the second channel 48. The respective inlet pipe 62 lies at least approximately with the corresponding first axis 74 parallel to a channel longitudinal direction of the first channel 46 or the second channel 48.

The outlet pipe 64 points towards the base 16. Exhaust air can be emitted to the surroundings of the suction device 10 directly via the corresponding outlet 70 or via a corresponding outlet device.

In a further exemplary embodiment of a flow deflection element 60 "( Figure 6 ) a first arm 113a with an inlet pipe 114 and a second arm 113b with an outlet pipe 116 are provided, which are oriented transversely and in particular perpendicular to one another. As a result, the inlet pipe 114 and the outlet pipe 116 are also transverse and in particular perpendicular to one another. The inlet pipe 114 has a rectangular area 118. Furthermore, the outlet pipe 116 has a rectangular area 120.

At the rectangular area 118, the inlet pipe 114 has an inlet 119. This has a rectangular cross section with a width B ₁ in the corresponding width direction and a depth T ₁ in the corresponding depth direction.

At the rectangular region 120, the outlet pipe 116 has an outlet 121. This has a rectangular cross section with a width B ₂ in a width direction and a depth T ₂ in a depth direction.

A first transition area 122 of the first arm 113a adjoins the rectangular area 118, on which an entrance 124 is located. The entrance 124 has a non-rectangular cross-sectional area. The first transition area 122 serves to provide a transition from the non-rectangular inlet 124, which has a circular opening area, for example, to the rectangular area 118 with the inlet 119. The transition is such that, in particular, the hydraulic cross-sectional area along the first transition region 122 along an axis of the inlet pipe 114 remains at least approximately constant.

In the same way, the rectangular area 120 of the outlet pipe 116 is followed by a second transition area 126 which opens into an outlet 128. The exit 128 likewise has a non-rectangular cross-sectional area and the second transition area 126 is used accordingly for the transition to the rectangular area 120.

In the exemplary embodiment shown, the inlet 124 and the outlet 128 have the same cross-sectional area.

In the flow deflection element 60 ″, the first arm 113a is formed by the inlet tube 114 and the first transition region 122. The inlet 119 is spaced from the inlet 124, the inlet 124 forming one end of the first arm 113a. In the same way the second arm 113b is formed by the outlet pipe 116 and the second transition region 126. The outlet 121 is spaced apart from the outlet 128, the outlet 128 forming one end of the second arm 113.

The essential part of the flow deflection element 60 ′ for sound damping is the area between the inlet pipe 114 and the outlet pipe 116.

The flow deflection element 60 ″ has a transition area 130 at an inner angle area, which is correspondingly curved without edges. At an outer angle area, opposite the transition area 130, lies an edge 132 with the depth T = T ₁ = T ₂ , at which the inlet pipe 114 or the outlet pipe 116 are directly connected to each other.

The flow deflecting element 60 ″ does not have a trough. It can be provided with such a trough.

The flow deflection element 60 ′ has a partial area, namely the rectangular areas 118 and 120 with a rectangular cross-sectional area. At one end of these partial areas, the cross-sectional area has an area of B ₂ x T ₂ (= B ₁ x T ₁ ).

The flow deflecting element 60 ′ or 60 ″ can be used, for example, with the cleaning device 10 or also in other applications.

According to the invention, it is provided that the flow deflection element 60 or 60 'or 60 "is""flat" based on its depth T ₂ at the outlet 70 or 121. The width B ₂ on a rectangular cross-sectional area is greater than the depth T. ₂ and is in particular at least 1.2 times the depth T ₂ .

It has been shown that with such a design an effective noise reduction is achieved for an air flow flowing through.

In Figure 7 are measured values for flow deflection elements with the basic design as in Figure 6 for different ratios B ₂ to T ₂ shown. It shows the transmission loss ΔTM in dB (A). The transmission losses are shown on a negative scale. The more negative this value, the more effectively a noise reduction takes place when there is a flow through the corresponding flow deflection element 60 ″.

One recognizes, for example, from the diagram according to Figure 7 that with a ratio of the width B ₂ to the depth T ₂ of 5, a flow reduction of approx. 8 dB (A) occurs.

In particular, when the ratio B ₂ to T _{2 is} greater than or equal to 1.2, there is an effective noise reduction.

In Figure 7 the pressure loss in the flow as a function of the ratio of B ₂ to T ₂ for the flow deflecting element 60 ″ is also shown. The corresponding pressure loss is justifiable in view of the strong noise reduction obtained.

The cause of the effective noise reduction through flat flow deflection elements 60, 60 ', 60 "is illustrated in FIG Figures 8 and 9 explained.

In the Figures 8 (a), (b), (c) the inlet pipe 114 and the outlet pipe 116 are indicated. The Figures 8 (a), (b), (c) differ in the frequency of the incoming sound wave. What is shown is the course of a sound pressure 134 for different frequencies f ₁ , f ₂ , f _{3 of} the sound wave.

The sound wave entering the inlet pipe excites transverse modes at the transition into the outlet pipe 116. The excitation and propagation of transverse modes depends on the frequency.

The in Figure 8 (a) As shown in the example shown with a low frequency, the generated transverse mode can propagate in the outlet pipe 116.

At the frequency f ₂ according to Figure 8 (b) the corresponding transverse fashion cannot spread. It is stimulated, but cannot escape. This is due to the geometric relationships in the formation of the flow deflecting element 60 ″ in combination with the corresponding frequency f ₂ .

When the frequency rises again ( Figure 8 (c) ), then the excited transverse mode can exit.

Basically the case is according to Figure 8 (b) the desired case, since preventing the escape of a lateral mode leads to a noise reduction.

The frequency f ₂ is a type of maximum frequency at which a transverse mode can no longer propagate.

This frequency f _max results as f _max = c / 2B ₂ , where c is the speed of sound.

If the width B _{2 is} now selected to be large for a given depth T ₂ , an effective noise reduction can be achieved due to the influence on the propagation of transverse modes.

In Figure 9 (a) a case is indicated with a first width B ₂ . This width B ₂ for the flow deflecting element 60 ″ is 5 cm in the example shown.

In Figure 9 (b) a width of 15 cm was selected for the flow deflecting element 60 ″ with the same depth T ₂ .

In the Figures 9 (a) and 9 (b) shows the transmission loss as a function of the frequency. It can be seen that in the case of the greater width, the transmission losses are increased and thus a noise reduction takes place.

In principle, the surface area of the cross-sectional area B ₂ × T ₂ is predetermined by the fact that a certain volume flow can flow in the air guiding device 28. As a rule, the product B ₂ × T ₂ is therefore predetermined in particular by the corresponding dimensioning of the suction unit device 22. An effective noise reduction can be achieved by adapting the ratio of B ₂ to T ₂ , which is at least 1.2.

This effective noise reduction is achieved by influencing the transverse modes accordingly. (In the Figures 8 only the first transverse mode was indicated. In addition to the first transverse mode, there are also higher transverse modes.)

The suction unit device 22 forms a noise source which is a direct or indirect sound generator. This noise source is not mono-frequent, for example, but has a frequency spectrum. An effective noise reduction can be achieved with the solution according to the invention (compare the Figures 7 and 9 (b) ).

In the cleaning device 10, the flow deflection elements 60 or 60 ′ or 60 ″ are installed transversely, so to speak, in the sense that they cause a flow deflection transversely to a guide plane of the guide device 30 at the area 33 and the first channel or the second channel 48 The main direction of flow in the area 33 and in the channels 46, 48 lies parallel to this plane. The flow deflection elements 60, 60 ', 60 ″ in the suction device 10 cause a flow deflection transversely and in particular perpendicular thereto.

In a further exemplary embodiment of a cleaning device, which is a suction device and is shown schematically in FIG Figure 10 and denoted by 134, a guide device 136 is provided for exhaust air. This is linked to a suction unit 138.

The guide device 136 has a channel 140 which opens into the outer space via an opening device 142. This channel 140 defines a curved guideway.

The channel 140 is connected in a flow-effective manner to the suction unit device 138, that is to say to an exhaust air orifice thereof, via a flow deflection element 60 (which can be designed as a flow deflection element 60 ′ or 60 ″).

If a flow deflection element 60 'is used as an example, the inlet pipe 114 opens in the direction of the suction unit device 138 and the outlet pipe 116 opens in the channel 140. The inlet 124 and the outlet device 142 are in particular at least approximately diametrically opposite. The flow deflection element 60 ensures that the flow is deflected starting from the suction unit device 138 into the channel 140. Air is then emitted from duct 140 (after noise reduction at flow deflection element 60).

It is also possible, for example, for a plurality of flow deflection elements 60 to be arranged in the guide device 136 and, for example, for a flow deflection element 60 to be arranged upstream of the orifice device 142.

In the exemplary embodiment 10 of a suction device, the flow deflecting element (s) 60 is or are connected more or less directly upstream of an opening device into the outer space. The flow deflection elements 60 do not ensure a flow deflection from the area 33 into the channels 46, 48. This is done by appropriately designing these areas and channels.

In the exemplary embodiment of a suction device 134, the flow deflecting element 60 is connected directly downstream of the suction unit device 138 and ensures a flow deflection in the area of the coupling of exhaust air into the guide device 136.

Another exemplary embodiment of a cleaning device is a high-pressure cleaner 144 ( Figure 11 ). Such a high-pressure cleaner has in particular a pump unit 146 as a noise source.

It can be provided that the high-pressure cleaner has an air guiding device 148. This is used in particular to guide cooling air. In one embodiment, a flow deflection element 60 is positioned on the air guide device 148, for example, directly associated with the pump unit 146. This ensures a flow deflection in order, for example, to allow cooling air to flow along an upper side 150 of a housing 152 inside the housing 152 in a channel 154. The flow deflection element 60 ensures, as described above, a noise reduction, with a noise reduction of approximately 8 dB (A) being achievable, in particular with a corresponding selection of the ratio of B to T.

According to the invention, a flow deflection element 60 or 60 'or 60 "is provided which has rectangular areas, the ratio of a width to a depth at a corresponding cross-sectional area at an outlet being greater than or at least 1.2. This results in an effective noise reduction The resulting pressure losses are acceptable.

The physical effect of the strong noise reduction through a "flat" flow deflection element 60 is due to the excitation of transverse modes and prevention of the propagation of transverse modes in the outlet pipe 64 or 116.

Corresponding flow deflection elements can be used on a large number of cleaning devices such as suction devices (stand-alone or, for example, used in vehicles). The corresponding “noisy” air guide device can, for example, be a process air guide device or a cooling air guide device. When used in a suction device, the air guide device is, for example, a guide device for exhaust air. For example, it can also be a guide device for cleaning air for cleaning the filter.

During the manufacture of the cleaning device, the flow deflecting element 60 is dimensioned according to the invention in such a way that the ratio of B ₂ to T _{2 is set} at an outlet 70 for a given volume flow. The volume flow determines the cross-sectional area at inlet 66 and outlet 70. The ratio of B ₂ to T ₂ is chosen so that the desired noise reduction results with functionally acceptable pressure losses.

In this context, the frequency spectrum of the noise source, such as a suction unit device 22, can also be taken into account.

In the flow deflection elements 60 ′ and 60 ″ described above, the cross-sectional areas at the respective inlets 66 and 119 and respective outlets 70 and 121 are the same and rectangular.

In a further embodiment of a flow deflection element, which is shown in Figure 12 Shown in a perspective view and designated by 200, a first arm 202a is formed by an inlet pipe 204. A second arm 202b oriented perpendicular to the first arm 202a is formed by an outlet pipe 206. The inlet pipe 204 has an inlet 208. The outlet pipe 206 has an outlet 210. The inlet 208 has a rectangular cross-sectional area with a width B ₁ in a first width direction and a depth T ₁ in a first depth direction. The outlet 210 is rectangular and has a width B ₂ in a second width direction and a depth T ₂ in a second depth direction. The first depth direction and the second depth direction are parallel to one another, as in the case of the flow deflection elements 60 ', 60 ". The first width direction and the second width direction are perpendicular to one another. The depth T ₁ and the depth T ₂ are the same. The widths B ₁ and B ₂ are different. In particular, the width B ₂ at the outlet 210 is greater than the width B ₁ .

The flow deflecting element 200 is dimensioned such that the ratio of the width B ₂ to the depth T ₂ at the outlet 210 is at least 1.2: 1 or greater, as mentioned above, in order to achieve an effective noise reduction.

Another exemplary embodiment of a flow deflection element 212 ( Figure 13 ) again comprises an inlet pipe 214 with an inlet 216 and an outlet pipe 218 oriented perpendicular thereto with an outlet 220. The cross-sectional areas at the inlet 216 and at the outlet 220 are the same. They are not exactly rectangular, but rounded off at the rectangle corners.

A cross-sectional area 222 at the outlet 220 (correspondingly also at the inlet 216) has an envelope 224 which is a rectangle, the sides of the rectangle of this envelope 224 having a width B ₂ in a (second) width direction and a depth T ₂ perpendicular thereto in a (second) direction of depth. Corresponding conditions also apply to inlet 216.

The outlet pipe 218 is dimensioned in such a way that, based on the envelope 224, the ratio of the width B ₂ to the depth T _{2 is} at least 1.2.

In a further exemplary embodiment of a flow deflection element 230 ( Figure 14 ) an inlet pipe 232 with an inlet 234 and an outlet pipe 236 oriented perpendicular thereto with an outlet 238 are provided. In one embodiment, the inlet pipe 232 and the outlet pipe 236 have the same cross-sectional area outside a transition region between the inlet pipe 232 and the outlet pipe 236.

A cross section at the outlet pipe 236 (and the outlet pipe 232) outside such a transition region is oval or elliptical.

A cross-sectional area 240 at the outlet 238 (and correspondingly also at the inlet 234) has an envelope 242 which is a rectangle. This rectangular envelope 242 has a width B ₂ in a (second) width direction and a depth T ₂ in a (second) depth direction.

According to the ratios are present at the inlet 234 in a first width direction and in a second depth direction.

The flow deflection element 230 is dimensioned such that at the outlet 238 the ratio of the width B ₂ to the depth T _{2 is} at least 1.2.

Another embodiment of a flow deflection element 250 ( Figure 15 ) has an inlet pipe 252 and an outlet pipe 254. An inlet 256 is formed on the inlet pipe 252. An outlet 258 is formed on the outlet pipe 254.

A cross-sectional area of the inlet pipe 252 and the outlet pipe 254 are the same outside of a transition area between the inlet pipe 252 and the outlet pipe 254.

An outer contour of the corresponding cross-sectional area (in particular at the outlet 258 and the inlet 256) has approximately the shape of a horizontal figure eight.

An envelope 260 of a cross-sectional area 262 at the outlet 258 is a rectangle of a width B ₂ in a (second) width direction and a depth T ₂ in a (second) depth direction. The flow deflection element 250 is dimensioned such that this width B _{2 is} at least 1.2 times the depth T ₂ .

Otherwise, the flow deflection elements 200, 212, 230, 250 are basically designed in the same way as the flow deflection elements 60 or 60 '. In particular, they can be provided with a depression corresponding to depression 108. It is possible that transition areas adjoin the corresponding inlet pipes and / or outlet pipes as described above with reference to the flow deflection element 60 ″.

In the case of the flow deflection elements 200, 212, 230, 250, the cross section at the respective outlet 210, 220, 238, 258 is direct (in the case of the flow deflection element 200) or for a rectangular envelope 224, 242, 260, such that the ratio of the width B. ₂ to the depth T _{2 is} at least 1.2 in order to achieve an effective noise reduction.

List of reference symbols

10

Suction device

12

Suction container

14th

Wheel device

16

document

18th

connection

20th

Suction head

22nd

Suction unit device

24

fan

26th

inner space

28

Air guiding device

30th

Guide device for exhaust air

33

Area

34

First wall

36

Second wall

38

First wall part

40

Second wall part

42

First wall part

44

Second wall part

46

First channel

48

Second channel

50

First mouth

52

Second mouth

54

Mirror plane

56

Wheel axle

58

Rear wheel

60

Flow deflection element

60 '

Flow deflection element

60 "

Flow deflection element

61a

First arm

61b

Second arm

62

Inlet pipe

64

Outlet pipe

66

inlet

68

Inlet port

70

Outlet

72

Outlet port

74

First axis

76

Second axis

78

Exterior angle area

80

Edge

82

Interior angle area

84

Transition area

86

First depth direction

88

First latitude

90

Second direction of depth

92

Second width direction

94a

First wall

94b

Second wall

96a

First wall area

96b

Second wall area

98a

Main flow direction

98b

Main flow direction

100

Osculating circle

102

Normal vector

104

Normal vector

106a

First part

106b

Second part

108

trough

110a

First sub-area

110b

Second sub-area

112

angle

113a

First arm

113b

Second arm

114

Inlet pipe

116

Outlet pipe

118

Rectangle area

119

inlet

120

Rectangle area

121

Outlet

122

First transition area

124

entrance

126

Second transition area

128

output

130

Transition area

132

Edge

134

Suction device

136

Guide device

138

Suction unit device

140

channel

142

Muzzle device

144

high pressure cleaner

146

Pump unit

148

Air guiding device

150

Top

152

casing

154

channel

200

Flow deflection element

202a

First arm

202b

Second arm

204

Inlet pipe

206

Outlet pipe

208

inlet

210

Outlet

212

Flow deflection element

214

Inlet pipe

216

inlet

218

Outlet pipe

220

Outlet

222

Cross sectional area

224

Enveloping

230

Flow deflection element

232

Inlet pipe

234

inlet

236

Outlet pipe

238

Outlet

240

Cross sectional area

242

Enveloping

250

Flow deflection element

252

Inlet pipe

254

Outlet pipe

256

inlet

258

Outlet

260

Enveloping

262

Cross sectional area

Claims (15)

1. Cleaning appliance, comprising at least one noise source (22) and an air guiding means (28) with at least one flow deflection element (60; 60'; 60"; 200; 212; 230; 250), wherein the at least one flow deflection element has a first arm (61a; 113a) with an inlet pipe (62; 114) and a second arm (61b; 113b) with an outlet pipe (64; 116), the outlet pipe (64; 116) is oriented transversely to the inlet pipe (62; 114), the inlet pipe (62; 114) has an inlet (66; 119) with an extent in a first depth direction (86) and in a first width direction (88), the outlet pipe (64; 116) has an outlet (70; 121) with a depth (T₂) in a second depth direction (90) and a width (B₂) in a second width direction (92), the first depth direction (86) and the second depth direction (90) are oriented in parallel to each other, and the first width direction (88) and the second width direction (92) are oriented transversely to each other, characterized in that the width (B₂) is at least 1.2 times the depth (T₂).
2. Cleaning appliance in accordance with Claim 1, characterized by at least one of the following:

   the second depth direction (90) and the second width direction (92) are oriented transversely and in particular perpendicularly to each other;

   the first width direction (88) and the second width direction (92) are perpendicular to each other;

   the width (B₂) and the depth (T₂) at the outlet (70; 121; 220; 238; 258) relate to a rectangular envelope (224; 242; 260), which has sides with an extent in the second depth direction (90) and the second width direction (92);

   the inlet (66; 119; 213; 234; 256) has a rectangular envelope, which has sides that extend in the first depth direction (86) and the first width direction (88);

   the ratio of the width (B₂) to the depth (T₂) is at least 1.5:1 and in particular at least 2:1 and in particular at least 3:1 and in particular at least 4:1 and in particular at least 5:1.
3. Cleaning appliance in accordance with any one of the preceding Claims, characterized by at least one of the following:

   the outlet pipe (64) has the same cross section from the outlet (70) to a connecting region with the inlet pipe (62);

   the inlet pipe (62) has the same cross section from the inlet (66) to a transition region to the outlet pipe (64);

   the inlet pipe (62; 114) has at the inlet (66; 124) the same hydraulic cross sectional area as the outlet pipe (64; 116) at the outlet (70; 128), and in particular the cross sectional area at the inlet (66; 124) has the same shape as the cross sectional area at the outlet (70; 128).
4. Cleaning appliance in accordance with any one of the preceding Claims, characterized by at least one of the following:

   the outlet (70; 128) of the outlet pipe (64; 116) forms an opening into a surrounding area of the cleaning appliance or the outlet (70; 128) of the outlet pipe (64; 116) is fluidically connected to an opening into the surrounding area;

   an inlet (66; 124) of the inlet pipe (62; 114) forms an opening, which is in fluidic connection with the noise source (22) or a sound generator coupled to the noise source.
5. Cleaning appliance in accordance with any one of the preceding Claims, characterized in that a hydraulic cross sectional area of the at least one flow deflection element (60; 60'; 60") is at least approximately constant between the inlet (66; 124) and the outlet (70; 128), at least outside of a transition region (84) between the inlet pipe (62; 114) and the outlet pipe (64; 116).
6. Cleaning appliance in accordance with any one of the preceding Claims, characterized in that the inlet (66; 119) of the inlet pipe (62; 114) forms an end of the first arm (61a; 113a) or is at a distance from an end of the first arm (61a; 113a), and/or characterized in that the outlet (70; 121) of the outlet pipe (64; 116) forms an end of the second arm (61b; 113b) or is at a distance from an end of the second arm (61b; 113b).
7. Cleaning appliance in accordance with any one of the preceding Claims, characterized in that a region or partial region (118) of the inlet pipe (62; 114) with a rectangular cross sectional area and a region or partial region (120) of the outlet pipe (64; 116) with a rectangular cross sectional area adjoin each other and the cross sectional areas are the same at least at ends of a transition region (84; 130) between the inlet pipe (62; 114) and the outlet pipe (64; 116), and/or
   characterized in that the first arm (113a) has in a partial region a non-rectangular cross sectional area with a first transition region (122) to a rectangular cross sectional area (113b) and/or in that the second arm (113b) has in a partial region a non-rectangular cross sectional area with a second transition region (126) to a rectangular cross sectional area.
8. Cleaning appliance in accordance with any one of Claims 1 to 7, characterized in that the inlet pipe (62) has at the inlet (66) and/or the outlet pipe (64) has at the outlet (70) a rectangular cross sectional area, or characterized in that the inlet pipe (232; 252) has at the inlet (234; 256) and/or the outlet pipe (236; 254) has at the outlet (238; 258) a non-rectangular cross sectional area.
9. Cleaning appliance in accordance with any one of the preceding Claims, characterized in that the inlet pipe (62; 114) and the outlet pipe (64; 116) are oriented perpendicular to each other and/or in that the inlet (66; 124) of the inlet pipe (62; 114) has an opening area (68) with a first normal vector (102) and the outlet (70; 128) of the outlet pipe (64; 116) has an opening area (72) with a second normal vector (104), wherein the first normal vector (102) and the second normal vector (104) are perpendicular to each other.
10. Cleaning appliance in accordance with any one of the preceding Claims, characterized in that the inlet pipe (62; 114) and the outlet pipe (64; 116) have at an exterior angle region (78) a common edge (80; 132), which extends in the first depth direction (86), and in particular characterized in that the edge (80) is arranged in a recess (108) in relation to an inner space of the flow deflection element (60; 60'; 60"), and in particular
    characterized in that at the edge (80; 132) at the exterior angle region a first wall of the inlet pipe (62; 114) and a second wall of the outlet pipe (64; 116) are oriented at an angle (112) to each other in the range between 60° and 90°.
11. Cleaning appliance in accordance with any one of the preceding Claims, characterized in that a transition region (84; 130) between the inlet pipe (62; 114) and the outlet pipe (64; 116) has at an interior angle region a wall (96b) that is curved in relation to the first depth direction (86), and in particular
    characterized in that the curved wall (96b) is located opposite a common edge (80) of the inlet pipe (62) and the outlet pipe (64), and in particular
    characterized in that an inner radius (R) at the curved wall (96b) is greater than a half hydraulic diameter of the inlet pipe (62).
12. Cleaning appliance in accordance with any one of the preceding Claims, characterized in that the air guiding means (28) is a guiding means for cooling air and/or the air guiding means (28) is a guiding means (30) for process air.
13. Cleaning appliance in accordance with any one of the preceding Claims, characterized in that the cleaning appliance is a suction appliance (10), and in particular
    characterized in that the air guiding means (28) is a guiding means (30) for exhaust air of a suction unit device (22), and in particular characterized in that the guiding means (30) for exhaust air has at least one path at which the at least one flow deflection element (60; 60'; 60") is arranged, wherein the at least one path in particular is curved, and in particular
    characterized in that a first flow deflection element and a second flow deflection element are arranged symmetrically and in particular mirror symmetrically to the suction unit device (22), and in particular
    characterized in that the at least one flow deflection element (60; 60'; 60") is arranged such that the outlet pipe (64) points in the direction of a base (16) when the suction appliance (10) is placed on the base (16) for proper operation, and in particular
    characterized in that the at least one flow deflection element (60; 60'; 60") is arranged at an entrance of the guiding means (136) for exhaust air in relation to the suction unit device (138) and/or at an exit for exhaust air for discharging into the surrounding area, and in particular
    characterized in that the air guiding means (28) is a guiding means for cleaning air for cleaning off a filter means of the suction appliance.
14. Cleaning appliance in accordance with any one of Claims 1 to 12, characterized by a configuration as a high pressure cleaning appliance.
15. Method for producing a cleaning appliance in accordance with the preamble of Claim 1, in which when there is a predetermined volume flow through the air guiding means (28) the at least one flow deflection element (60; 60'; 60") is dimensioned such that at the outlet (70; 119; 210; 220; 238; 258) the width (B₂) is at least 1.2 times the depth (T₂).

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