EP2567648A1 - Suction nozzle - Google Patents

Abstract

The suction nozzle (50) comprises a suction mouth which is adjoined by a suction channel. A negative-pressure source is connected to the suction channel at its end facing away from the suction mouth to create a suction flow. The suction channel has a bottom wall and a top wall which are connected to one another by the side walls. The side panels are arc-shaped curved.

Description

The invention relates to a suction nozzle, in particular for a Hartflächenabsauggerät, with a suction mouth, which is followed by a suction, at its end remote from the suction mouth a vacuum source is connectable to form a suction flow, wherein the suction channel has a bottom wall and a top wall, the side walls connected to each other. Preferably, at least one flexible wiper lip is arranged at the suction mouth.

Moreover, the invention relates to a Hartflächenabsauggerät with such a suction nozzle.

For aspiration of hard surfaces, such as tiled walls or floors, and also for removing a water film of windows or glass doors Hartflächenabsauggeräte can be used, which have a vacuum source in the form of a suction unit and a suction nozzle, which is in flow communication with the suction unit and the suction mouth the suctioned hard surface can be created. By means of the suction unit then a suction flow can be achieved, so that dirt and water can be sucked through the suction mouth of the hard surface and transferred to a dirt container of Hartflächenabsauggerätes. Such Hartflächenabsauggeräte with a suction nozzle are for example from the U.S. Patents 3,254,360 and 3,118,165 known. In addition, such Hartflächenabsauggeräte with a suitable suction nozzle in the DE 25 55 648 A1 described.

In order to achieve an effective cleaning effect, it is necessary to produce the strongest possible suction flow in the area of the suction mouth, so that dirt particles and / or water droplets are reliably detected by the suction flow. To achieve a correspondingly strong Suction flow, a large-sized suction unit can be used. However, this requires a considerable amount of space. In addition, it is necessary to provide a correspondingly large-sized power source. In addition, large-sized suction units are associated with a not inconsiderable noise.

Object of the present invention is to develop a suction nozzle of the type mentioned in such a way that forms an effective suction flow in the suction mouth when connecting the suction nozzle to a vacuum source at the lowest possible energy consumption of the vacuum source.

This object is achieved in a suction nozzle of the generic type according to the invention in that the side walls of the suction channel are curved arcuately.

It has been shown that the flow losses in the suction channel can be considerably reduced by providing arcuately curved side walls, so that even with a relatively small-sized vacuum source in the region of the suction mouth, an effective suction flow can be achieved. This allows in particular the formation of an effective suction flow in a portable Hartflächenabsauggerät with rechargeable energy source, such as a lithium-ion battery.

The arcuately curved side walls also have the advantage that within the suction channel a suction flow can be achieved with the lowest possible gradient of the flow velocity. As a result, the risk can be minimized that in the suction channel little or no moving air strikes heavily moving air and thereby form vortex. Such vortices represent areas of the suction flow with a very low flow velocity (so-called "dead spots") and can be a deposit of dirt particles or drops of water within the suction channel result, so that the suctioned in the region of the suction mouth particles and droplets are insufficiently transported through the entire suction channel. The risk of vortex formation within the suction channel is significantly reduced by the provision of arcuately curved side walls. Thus, not only flow losses can be reduced but also the risk of entrainment of entrained particles and liquid droplets.

It is particularly advantageous if the side walls are curved in an arc shape virtually over their entire length. In such an embodiment, the side walls, starting from their suction mouth adjacent the front end to their suction mouth facing away from the rear end arcuately curved, they have at most at its front and / or rear end a rectilinear wall section. It has been shown that this flow losses can be greatly reduced.

It is particularly advantageous if the side walls are oriented parallel to the central axis of the suction nozzle in their front end region facing the suction mouth, perpendicular to a center axis of the suction nozzle and in their rear end region remote from the suction mouth. In its front end region, the side walls can form a rear wall of the suction channel opposite the suction mouth, and in their rear end region they can be aligned parallel to the flow direction of the suction flow. It has been shown that this can effectively counteract the formation of vortices within the suction channel.

The side walls may be curved in a circular arc with the same radius of curvature. However, it is particularly advantageous if the radius of curvature of the side walls changes from their front end area to their rear end area. In particular, a continuous Changing the radius of curvature of the side walls from their front to their rear end portion has proved to be particularly advantageous. Thus, the side walls in their front and in their rear end region each have a very large radius of curvature, which preferably decreases continuously in the direction of a central portion of the suction channel.

An additional reduction of flow losses within the suction channel and an additional reduction of the risk of vortex formation is achieved in a preferred embodiment of the invention that at least in a longitudinal section of the suction channel, the distance of the ceiling wall of the bottom wall in the adjacent to the side walls lateral edge regions of the suction channel larger than in the central area of the suction channel. The flow cross section of the suction channel thus increases starting from the central region in the direction of the lateral edge regions. This has the consequence that the flow velocity of the suction flow in the edge regions is lower than in the central region. The reduced flow velocity in the edge regions results in a reduced friction of the suction flow on the side walls, since the friction is dependent on the flow velocity of the suction flow. It has been shown that the danger of a formation of vortices and thus the danger of the formation of "dead spots" of the suction flow can thereby be counteracted particularly effectively. This reduces the risk of dirt particles or liquid droplets depositing within the suction channel.

Conveniently, the bottom wall and / or the top wall is arcuately curved into the interior of the suction channel at least in a longitudinal section of the suction channel in a sectional plane running transversely to the center axis of the suction nozzle. In such an embodiment, therefore, not only the side walls at least partially on an arcuate course, but in addition, the bottom wall and / or the ceiling wall in a transverse to Central axis of the suction nozzle extending cutting plane arcuately curved. The bottom wall and / or the ceiling wall thus forms a kind of "dent" or constriction of the suction channel. As a result, the formation of flow regions with reduced flow velocity ("dead spaces") can be counteracted. The risk that stagnant air encounters moving air, ie high velocity gradients, is thereby avoided and thus also the danger that vortex form and deposit dirt particles and / or liquid droplets.

Preferably, the bottom wall and / or the ceiling wall are arcuately curved into the interior of the suction channel, at least in a longitudinal section of the suction channel in a sectional plane running parallel to the central axis of the suction nozzle. The suction channel can thereby have a smaller flow cross-section in a region between the suction mouth and the end remote from the suction mouth than in the region of the suction mouth and in the region of the end remote from the suction mouth. Starting from the suction mouth, the flow cross-section in the direction of the suction mouth facing away from the end of the suction channel can thus first shrink, in particular, a continuous reduction can be provided, and after passing through a narrowest flow cross-section, this can increase in the direction of the end remote from the suction mouth, in particular, a continuous enlargement can be provided. As a result, a particularly effective cleaning effect can be achieved with a relatively small-sized vacuum source, wherein virtually no dirt particles or liquid droplets are deposited within the suction channel.

It is particularly advantageous if the suction nozzle has two flexible wiper lips which define the suction mouth between them. The wiper lips can in this case have a different material thickness. The material thickness of a first wiper lip, for example, less than half, in particular less than one third of the material thickness of the second wiper lip.

It is advantageous if one of the two wiper lips has recesses at its free front edge projecting from the suction channel. Preferably, the recesses are open to the front edge. The two leading edges define between them the suction mouth, and through the recesses on one of the two leading edges flow passages are defined in which the suction flow has a high flow velocity, so that dirt particles and / or liquid droplets can be particularly effectively entrained and sucked into the suction channel.

Preferably, the recesses of one wiper lip are covered by the leading edge of the other wiper lip. For example, the leading edge of the other wiper lip may have a straight course. This wiper lip can thereby act as Abziehlippe, in front of the liquid to be sucked accumulates, which can be sucked through the suction mouth.

It is favorable if at least one of the two wiper lips in the area of the suction mouth, facing the other wiper lip, has a multiplicity of elevations. The protrusions are spacers that ensure that the scraper lips, even if they are directly adjacent to each other, form between them flow passages for the suction flow and entrained dirt particles and liquid droplets.

Preferably, at least one wiper lip is replaceably held on a housing of the suction nozzle. This facilitates the assembly and possibly also the repair of the suction nozzle. In addition, one of the two preferably used for use Abstreiflippen can be reversed relative to the other wiper lip when the voltage applied to the hard area of the Front edge is worn. The life of the Hartflächenabsauggeräts can be extended.

In a particularly preferred embodiment, the suction nozzle comprises a housing having a first and a second half-shell, which receive an air guide part between them, wherein the first and / or the second half-shell and the air guide part define the suction channel. In such an embodiment, the suction channel is not defined exclusively by the housing of the suction nozzle but it additionally comes an air guide member is used, which is arranged between the two half-shells of the suction nozzle housing. The air guide part allows an optimization of the geometry of the suction channel, without thereby affecting the external appearance of the suction nozzle. The outer shape of the suction nozzle can therefore be adapted to the remaining shape of the Hartflächenabsauggerätes, without taking into account the geometry of the suction channel. The shape of the air guide part in turn can be selected with regard to an optimal suction flow, without taking into account the external shape of the suction nozzle. By means of the air guide part, for example, a cross-sectional constriction of the suction channel can be achieved without this being directly recognizable on the housing of the suction nozzle.

The air guide member may be inserted in a preferred embodiment of the invention in the assembly of the suction nozzle between the two half-shells, and then the two half-shells, preferably releasably connected to each other. For connection of the two half-shells, for example, a snap-action, latching or screw connection can be used.

In a preferred embodiment, a first flexible wiper lip is integrally formed on the first or second half shell of the housing.

In particular, it can be provided that the first or second half-shell and the first flexible wiper lip form a one-piece injection-molded part with two components. In such an embodiment, the first or second half-shell is produced in combination with the first flexible wiper lip in a two-component injection molding process, wherein different plastics can be used. The first or second half-shell may for example be made of an ABS material and for the first flexible wiper lip, a rubber-like plastic material may be used.

A second flexible wiper lip is clamped in a preferred embodiment between the air guide member and the first or second half-shell.

It is advantageous if the air guide part and the first or second half-shell together form a receptacle which receives a suction channel facing the rear edge of the second flexible wiper lip. Preferably, the trailing edge forms a positive connection with the receptacle.

As mentioned above, the invention relates not only to a suction nozzle but also a Hartflächenabsauggerät, in particular a portable Hartflächenabsauggerät, for example a device for extracting window panes, in which a liquid film can be sucked from the window pane. For this purpose, the Hartflächenabsauggerät on a suction unit, a dirty liquid tank and a separator for separating liquid from a sucked liquid-air mixture. In addition, the Hartflächenabsauggerät invention comprises a suction nozzle of the type described above. By means of the suction nozzle with low energy consumption of the suction unit in the region of the suction mouth an effective suction flow can be achieved, so that liquid droplets can be effectively sucked from a hard surface. From the suction flow are the Entrained liquid droplets. They meet within the Hartflächenabsauggerätes on a separator and are collected in a dirty liquid tank. The provision of the above-explained suction nozzle for the Hartflächenabsauggerät has the advantage that deposit virtually no liquid droplets within the suction channel.

An advantageous embodiment of the Hartflächenabsauggeräts is characterized by a rechargeable power source, in particular a lithium-ion battery. This facilitates the handling of the device, especially if the device is designed to be portable and can be held by the user with one hand. The rechargeable energy source is preferably arranged in the housing of the Hartflächenabsauggeräts.

Preferably, the Hartflächenabsauggerät on a receiving shaft into which the suction mouth remote from the end of the suction channel is used. The receiving shaft thus holds the rear end of the suction channel. Such an embodiment is particularly advantageous if the suction nozzle is releasably held on a housing of Hartflächenabsauggerätes, because by the insertion of the rear end of the suction channel in the receiving shaft, the risk of mechanical impairment of the rear end of the suction channel is kept very low.

In order to avoid that the suction flow during operation of the Hartflächenabsauggerätes is affected by the increasing liquid level in the dirty liquid tank, it is advantageous if the Hartflächenabsauggerät upstream of the suction unit has a separation chamber which receives the separator and connected via a drain opening with the dirty liquid tank is. In such an embodiment, the suction flow is outside of the dirty liquid tank and is therefore not affected by the level of accumulated liquid in the dirty liquid tank. There is rather a separate separation chamber used, which receives the separator and is arranged in the flow path between the suction nozzle and the suction unit. The separation device can be designed in the form of a separation wall, which is preferably arcuately curved in order to minimize flow losses. On the separation wall meets a liquid-air mixture on sucking a water film from a hard surface. The liquid separates on the separation wall and is transferred via the discharge opening of the deposition chamber in the dirty liquid tank. The air, however, flows around the separation wall and passes to the suction unit and can be transferred from this via molded into the housing of Hartflächenabsauggerätes exhaust openings to the outside.

The Hartflächenabsauggerät is preferably equipped with a handle. This can be hollow, so that a suction can be passed through the handle. This gives the Hartflächenabsauggerät a particularly compact design.

In a particularly preferred embodiment of the hard surface suction device according to the invention, the rear end region of the suction channel facing away from the suction mouth and / or the front end region of the suction unit connecting the suction unit with the separation chamber within the separation chamber are at least partially surrounded by at least one intermediate storage region for separated liquid. The provision of at least one temporary storage area gives the user the opportunity to operate the Hartflächenabsauggerät not only in an upright position but also in a tilted to the vertical position, in particular the Hartflächenabsauggerät can also be operated overhead so that the suction nozzle is arranged below the suction unit. In such applications, liquid deposited within the deposition chamber may initially accumulate within the deposition chamber in one or more intermediate storage areas corresponding to those in FIG surrounding the deposition chamber dipping rear end portion of the suction channel and / or dipping into the deposition chamber front end portion of the suction. If the Hartflächenabsauggerät operated at a later time again in an upright position, the liquid can flow from the at least one intermediate storage area via the drain opening in the dirty liquid tank. Such an embodiment of the Hartflächenabsauggeräts is thus characterized not only by an effective cleaning effect, but also the Hartflächenabsauggerät for sucking a film of water windows can be performed in the same way along the window, as is known from the handling of conventional window cleaning equipment in which liquid applied to the windowpane is manually removed from the windowpane by means of a puller having a rubber lip.

It is advantageous if the rear end region of the suction channel dips into a receiving shaft projecting into the deposition chamber, wherein the receiving shaft and at least one outer wall of the deposition chamber defines at least one intermediate storage region. The receiving shaft forms a mechanically loadable support for the rear end region of the suction channel and, in combination with an outer wall of the deposition chamber, at least one intermediate storage region in which liquid deposited within the separation chamber can accumulate when the hard surface extraction device is inclined to the vertical or is operated overhead ,

It can be provided that the front end region of the suction line protrudes into the deposition chamber and is surrounded within the separation chamber in the circumferential direction by an annular intermediate storage region. This allows a structurally simple way to provide a relatively large volume buffer area within the deposition chamber.

Preferably, at least one intermediate storage area widens in the direction of the separating device. This facilitates the draining of liquid initially accumulated in a buffer storage area into the dirty liquid tank.

Figur 1:

eine perspektivische Darstellung eines Hartflächenabsauggerätes;

Figur 2:

eine Schnittansicht des Hartflächenabsauggerätes aus Figur 1;

Figur 3:

eine Schnittansicht einer Saugdüse des Hartflächenabsauggerätes;

Figur 4:

eine Draufsicht auf eine erste Halbschale eines Gehäuses der Saugdüse aus Figur 3;

Figur 5:

eine Draufsicht auf die in Figur 4 gezeigte erste Halbschale des Gehäuses, auf die ein Luftführungsteil aufgesetzt ist;

Figur 6:

eine Schnittansicht längs der Linie 6-6 in Figur 5;

Figur 7:

eine Schnittansicht längs der Linie 7-7 in Figur 5 und

Figur 8:

eine Schnittansicht längs der Linie 8-8 in Figur 5.

The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:

FIG. 1:

a perspective view of a Hartflächenabsauggerätes;

FIG. 2:

a sectional view of the Hartflächenabsauggerätes FIG. 1 ;

FIG. 3:

a sectional view of a suction nozzle of Hartflächenabsauggerätes;

FIG. 4:

a plan view of a first half-shell of a housing of the suction nozzle FIG. 3 ;

FIG. 5:

a top view of the in FIG. 4 shown first half shell of the housing, on which an air guide part is placed;

FIG. 6:

a sectional view taken along the line 6-6 in FIG. 5 ;

FIG. 7:

a sectional view taken along the line 7-7 in FIG. 5 and

FIG. 8:

a sectional view taken along the line 8-8 in FIG. 5 ,

In the drawing, a portable Hartflächenabsauggerät 10 is shown schematically, can be sucked with the liquid from a hard surface, such as water from a window pane. The hard surface suction device 10 can be held by the user with one hand on a handle 12 and guided in the manner of a conventional, a rubber lip having puller on the hard surface along.

The Hartflächenabsauggerät 10 includes a base housing 14, which forms the handle 12 and a suction unit 16 with a suction turbine 17 and an electric motor 18 receives. Within the base housing 14 is at least one rechargeable battery 19, in particular a lithium-ion battery arranged to supply power to the electric motor 18. On the underside, the base housing 14 forms a base 21, so that the Hartflächenabsauggerät 10 in an upright position, as shown in the FIGS. 1 and 2 is shown, can be placed on a floor space.

Disposed laterally next to the base housing 14 is a dirty fluid tank 23 which can be removed from the main housing 14 and into which a filling device 25 projects with a discharge channel 26 and a ventilation channel 27 aligned parallel to the discharge channel 26. The ventilation channel 27 protrudes from the top side via the drainage channel 26. The side of the filling device 25, the dirty liquid tank 23 on its side facing away from the handle 12 on a means of a lid 28 tightly closable drain opening 29.

On the upper side closes to the base housing 14 and the dirty liquid tank 23 to a deposition chamber 33, which is releasably connected via a releasable latching connection with the base housing 12. To release the latching connection 33 push buttons 34 are arranged on the outside of the deposition chamber. The deposition chamber 33 has outer walls in the form of a subsequent to the dirty liquid tank 23, concavely curved front wall 36, a subsequent to the handle 12, convex curved rear wall 37 and in the form of the front wall 36 integral with the rear wall 37 connecting side walls, of which in the drawing, namely in FIG. 1 , only one side wall 38 can be seen.

Within the deposition chamber 33, a separation device in the form of a baffle 40 is arranged, which is arcuately curved. On the upper side, the deposition chamber 33 is delimited by a ceiling wall 42 connecting the front wall 36, the rear wall 37 and the two side walls 38 in one piece, to which a receiving shaft 43 projecting into the deposition chamber 33 is integrally formed.

On the upper side, a suction nozzle 50 connects to the deposition chamber 33, which is detachably connected to the deposition chamber 33. For this purpose, a latching connection is used with an internally formed in the front wall 36 of the deposition chamber 33 locking receptacle 51 into which a latching hook 52 engages, which is screwed by means of a connecting screw 53 with a housing 55 of the suction nozzle 50.

The housing 55 is formed by a first half-shell 56 adjoining the front wall 36 of the deposition chamber 33 and a second half-shell 57 adjoining the rear wall 37 of the deposition chamber 33. The two half-shells 56 and 57 receive between them an air guide part 59, which defines a suction channel 60 in combination with the first half-shell 56.

Facing away from the deposition chamber 33, a first flexible wiper lip 62 is integrally formed on the first half shell 56, on the front edge 63 facing away from the suction channel 60 a second wiper lip 65 bears with a front edge 66 facing away from the suction channel 60. With its suction channel 60 facing the rear edge 67, the second wiper lip 65 is clamped between the second half-shell 57 and the air guide member 59. The second half-shell 57 forms in this case, in combination with the air guide part 59, a receptacle 69, which receives the trailing edge 67 of the second wiper lip 65 in a form-fitting manner.

The two wiper lips 62, 65 define a suction mouth 70, which is adjoined by the suction channel 60, which, with its rear end region 72 facing away from the suction mouth 70, dips into the receiving shaft 43 of the deposition chamber 33. At the mouth of the suction port 70 facing away from the suction mouth 70, a holding element 75 is arranged, which carries a flat baffle plate 76 at a distance from the mouth opening 73 within the deposition chamber 33.

As in particular from FIG. 1 becomes clear, extending the suction nozzle, starting from the handle 12 transversely to the longitudinal extent of the handle 12, so that the wiper lips 62 and 65 extend over a multiple of the width of the base housing 14 and thus can capture a sucked hard surface, in particular a window, large area.

As in particular from FIG. 4 3, which shows a plan view of the first half-shell 56 with the first wiper lip 62 formed thereon, the leading edge 63 of the first wiper lip 62 is provided with recesses by forming a plurality of approximately semicircular depressions 78 in the front edge 63 equidistantly from one another. In a central region of the first wiper lip 62 approximately triangular projections 79 are arranged between adjacent depressions 78 on the upper side, that is to say facing the second wiping lip 65. In the region of the suction mouth 70, the depressions 78 and the elevations 79 form flow passages for a suction flow, which is produced by the suction unit 16 during the operation of the hard surface suction device 10. How out FIG. 4 can be seen, the protrusions 79 are arranged on both sides of a central axis 80 of the suction nozzle 50, wherein they starting from the central axis 80 on both sides in each case over a quarter of the total width of the first wiper lip 62 are distributed. In contrast, the outer end portions of the first wiper lip 62 are free of elevations 79. In these outer end areas, however, recesses 78 are located in the front edge 73 as well as in the central area.

The suction channel 60, this is in particular from the FIGS. 7 and 8th clearly, has a bottom wall 82, which is formed by a central region of the first half-shell 56 and the first wiper lip 62. In addition, the suction channel 60 has a top wall 83, which is formed by the air guide member 59 and the second wiper lip 65. In addition, the suction channel 60 comprises arcuately curved side walls 84, 85, which are formed by the air guide member 59 and are integrally connected to the ceiling wall 83. With their top wall 83 facing away from the free end edges 86, 87 form the side walls 84 and 85 each have a groove 88 and 89, in which an upper side, that is, the second half-shell 57 facing spring 91 and 92 of the first half-shell 56 dips as well a subsequent to the spring 91 and 92, on the upper side of the first wiper lip 62 formed spring 94 and 95. The arcuate course of the side walls 84 and 85 is in particular from the corresponding arcuate course of the associated springs 91, 92 and 94, 95 from FIG. 4 clear. It can be seen that the side walls 84 and 85 are oriented perpendicular to the central axis 80 of the suction nozzle 50 in their front end region 97 or 98 facing the suction mouth 70, and the side walls 84 and 85 are in their rear end region 101 or 102 facing away from the suction mouth 70 aligned parallel to the central axis 80. Starting from their front end portions 97, 98, the side walls 84, 85 approach in the direction away from the suction mouth 70 continuously, with their radius of curvature continuously changes such that the radius of curvature of the side walls 84, 85 in the front end portions 97, 98 and in the rear end portions 101, 102 is practically infinite, whereas it assumes a smallest value in a central region in the longitudinal direction of the suction channel 60. Form in the front end regions 97 and 98 the side walls 84 and 85 practically a rear wall of the suction channel 60, which faces the suction mouth 70, and with their rear end portions 101 and 102, the side walls 84 and 85 parallel to the longitudinal direction of the suction channel 60 and thus parallel to the forming in the suction channel 60 suction flow.

In the FIGS. 7 and 8th the suction channel 60 is shown in section planes oriented perpendicular to the central axis 80. It is clear that the top wall 83 is curved transversely to the central axis 80 arcuately into the interior of the suction channel 60. This has the consequence that the distance occupied by the top wall 83 to the bottom wall 82 in the adjacent to the side walls 84 and 85 edge portions of the suction channel 60 is greater than in the central region of the suction channel 60. Starting from the central area thus widens As a result, the suction flow in the sidewalls 84, 85 adjacent edge regions of the suction channel 60 has a lower flow velocity than in the central region of the suction channel 60. This in turn causes a relative small friction between the suction flow and the side walls 84, 85. However, the flow cross-section is also sufficiently large in the side walls 84, 85 adjacent edge regions of the suction channel 60 that sucked into the suction mouth 70 dirt particles and liquid droplets reliably carried by the suction flow and not in the suction channel 60 are deposited. By increasing the flow cross-section starting from the central region of the suction channel to the edge regions, the formation of vortices and thus the formation of "dead spots" in which the flow velocity is very low or even zero can be avoided. There is therefore no risk that 60 dirt particles or liquid droplets are deposited within the suction channel. Instead, they are entrained by the suction flow which forms and are transferred from the suction mouth 60 into the deposition chamber 33.

FIG. 6 shows the suction channel 60 in a direction parallel to the central axis 80 extending cutting plane. Based on this sectional plane, the bottom wall 82 is curved arcuately into the interior of the suction channel 60, and also the ceiling wall 83 has a similar arcuate course. Relative to a sectional plane running parallel to the central axis 80, the suction channel widens starting from a central region 104 in relation to its longitudinal extension. It has been shown that this additionally counteracts the formation of vertebrae and thus areas with a very low flow velocity within the suction channel 60 can.

During operation of the Hartflächenabsauggerätes 10, the deposition chamber 33 is acted upon by the suction unit 16 with negative pressure. For this purpose, the suction unit 16 via a handle 12 by cross-suction line 105 with the deposition chamber 33 in flow communication. A mouth region 107 of the suction line 105 is designed in the form of a pipe socket 108 and protrudes into the deposition chamber 33 on the side of the impact wall 40 facing away from the rear end region 72 of the suction channel 60. The mouth opening 109 of the suction line 106 is covered by the convexly curved in the direction of the suction channel 60 baffle 40.

Due to the loading of the deposition chamber 33 with negative pressure, starting from the suction mouth 70, a suction flow is formed via the suction channel 60, the separation chamber 33 and the suction line 105. The sucked suction air can escape via laterally molded into the base housing 14 exhaust openings 111 from the base housing 14.

As already explained, the Hartflächenabsauggerät 10 can be performed on the hard surface along the hard surface in the manner of a puller for cleaning a hard surface, in particular a window or a glass door along for sucking liquid. Here, a liquid-air mixture passes through the suction port 70th and the suction channel 60 into the deposition chamber 33 and first encounters the spaced apart from the mouth opening 73 of the suction channel 60 baffle plate 76, at which a part of the entrained liquid separates. Subsequently, the liquid-air mixture meets the baffle 40, at which the remaining entrained liquid separates, whereas the sucked air flows around the baffle 40 and is guided via the suction line 105 to the suction unit 16. The separated within the deposition chamber 33 liquid can flow through the drain passage 26 into the dirty liquid tank 23. For this purpose, the deposition chamber 33 has a drain opening 113, on which a drain funnel 114 is arranged. The discharge funnel 114 tapers in the direction of the dirty liquid tank 23. Below the discharge funnel 114, the filling device 25 with the discharge channel 26 is arranged. The ventilation channel 27 passes through the discharge funnel 114 and projects into the deposition chamber 33.

In the FIGS. 1 and 2 the Hartflächenabsauggerät 10 is shown in an upright position, in which the suction nozzle 50 occupies a position above the suction unit 16 relative to the vertical. If the Hartflächenabsauggerät 10 is guided in this position on a hard surface to be sucked along, so can be within the deposition chamber 33 separated liquid readily to the drain opening 113 and pass through this in the dirty liquid tank 23. If, however, the Hartflächenabsauggerät 10 is operated in a lying position, in which the suction nozzle 50 is arranged relative to the vertical substantially at the level of the suction unit 16, or the Hartflächenabsauggerät 10 operated overhead so that the suction nozzle 50 relative to the vertical below the suction unit 16 is disposed, so deposited within the deposition chamber 33 liquid first accumulate in intermediate storage areas of the deposition chamber 33 until the Hartflächenabsauggerät 10 again in the in the FIGS. 1 and 2 shown upright position is operated. A first staging area 117 is located between the front wall 36 of the deposition chamber 33 and the receiving well 43, and a second buffer storage area 118 is positioned between the rear wall 37 of the deposition chamber 33 and the receiving well 43. Both intermediate memory areas 117, 118 extend continuously in the direction of the baffle 40. The two intermediate memory areas 117, 118 extend in the peripheral direction in each case over a part of the rear end area 72 of the suction channel 60.

A third intermediate storage region 119 extends annularly over the entire circumference of the mouth region 107 of the suction line 105 within the separation chamber 33. The third intermediate storage region 119 also widens continuously in the direction of the impact wall 40.

The first and second intermediate storage areas 117 and 118 receive liquid deposited in the deposition chamber 33, particularly when the hard surface suction device 10 is in the upside-down position, and the third intermediate storage area 119 absorbs liquid deposited in the deposition chamber 33, in particular when the hard surface suction device 10 is in a horizontal position There is a risk that separated liquid can reach the suction mouth 70 via the suction channel 60. If the Hartflächenabsauggerät 10 then operated again in an upright position, the liquid accumulated in the meantime flows from the intermediate storage areas 117, 118, 119 and passes through the drain opening 113 and the drain channel 26 into the dirty liquid tank 23rd

Since the drainage channel 26 protrudes into the dirty liquid tank 23, wherein the dipping into the dirty liquid tank 23 end 121 of the drain channel 26 relative to the in the FIGS. 1 and 2 shown upright position is located approximately halfway up the dirty liquid tank 23, even with a lying or upside down operation of Hartflächenabsauggerätes 10 no risk that already reached in the dirty liquid tank 23 liquid again from the dirty liquid tank 23rd flows out. The liquid contained within the dirty liquid tank 23 collects in the lying or upside down operation of the Hartflächenabsauggerätes 10 rather in the area surrounding the drain channel 26 of the dirty liquid tank 23rd

About the parallel to the drain passage 26 extending ventilation channel 27 of the dirty liquid tank 23 can be ventilated in any position of Hartflächenabsauggerätes 10 so that air can escape at any time from the dirty liquid tank 23, which can then be sucked through the suction line 105 from the deposition chamber 33.

The Hartflächenabsauggerät 10 can thus be operated in any position relative to the vertical, wherein in the deposition chamber 33 separated liquid can either go directly into the dirty liquid tank 23 or it is first stored in intermediate storage areas 117, 118 and 119 of the deposition chamber 33 until the Hartflächenabsauggerät 10 again assumes an upright position. To form a suction flow and thus an effective cleaning action only a relatively small-sized power supply of the suction unit 16 is required, because the suction channel 60 has only very low flow losses and beyond there is virtually no risk that within the suction channel 60 detected by the suction flow dirt particles or liquid droplets deposit.

1. 1. Saugdüse, insbesondere für ein Hartflächenabsauggerät, mit einem Saugmund, an den sich ein Saugkanal anschließt, an dessen dem Saugmund abgewandtes Ende eine Unterdruckquelle anschließbar ist zur Ausbildung einer Saugströmung, wobei der Saugkanal eine Bodenwand und eine Deckenwand aufweist, die über Seitenwände miteinander verbunden sind, dadurch gekennzeichnet, dass die Seitenwände (84, 85) bogenförmig gekrümmt sind.
2. 2. Saugdüse nach Anspruch 1, dadurch gekennzeichnet, dass die Seitenwände (84, 85) praktisch über ihre gesamte Länge bogenförmig gekrümmt sind.
3. 3. Saugdüse nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Seitenwände (84, 85) in ihrem dem Saugmund (70) zugewandten vorderen Endbereich (97, 98) senkrecht zu einer Mittelachse (80) der Saugdüse (50) und in ihrem dem Saugmund (70) abgewandten hinteren Endbereich (101, 102) parallel zur Mittelachse (80) der Saugdüse (50) ausgerichtet sind.
4. 4. Saugdüse nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass zumindest in einem Längsabschnitt des Saugkanals (60) der Abstand der Deckenwand (83) von der Bodenwand (82) in den an die Seitenwände (84, 85) angrenzenden seitlichen Randbereichen des Saugkanals (60) größer ist als in einem zentralen Bereich des Saugkanals (60).
5. 5. Saugdüse nach Anspruch 4, dadurch gekennzeichnet, dass die Bodenwand (82) und/oder die Deckenwand (83) zumindest in einem Längsabschnitt des Saugkanals (60) in einer senkrecht zur Mittelachse (80) der Saugdüse (50) verlaufenden Schnittebene bogenförmig in das Innere des Saugkanals (50) gekrümmt ist.
6. 6. Saugdüse nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Bodenwand (82) und/oder die Deckenwand (83) zumindest in einem Längsabschnitt des Saugkanals (60) in einer parallel zur Mittelachse (80) der Saugdüse (50) verlaufenden Schnittebene bogenförmig in das Innere des Saugkanals (60) gekrümmt ist.
7. 7. Saugdüse nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Saugdüse (50) zwei flexible Abstreiflippen (62, 65) aufweist, die den Saugmund (70) definieren.
8. 8. Saugdüse nach Anspruch 7, dadurch gekennzeichnet, dass eine der beiden Abstreiflippen (62) an ihrer freien, vom Saugkanal (60) abstehenden Vorderkante (73) Ausnehmungen (78) aufweist.
9. 9. Saugdüse nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass zumindest eine der beiden Abstreiflippen (62) im Bereich des Saugmundes (70), der anderen Abstreiflippe (65) zugewandt, eine Vielzahl von Erhebungen (79) aufweist.
10. 10. Saugdüse nach Anspruch 9, dadurch gekennzeichnet, dass die Erhebungen (79) nur über einen Teilbereich der Abstreiflippe (62) verteilt angeordnet sind.
11. 11. Saugdüse nach Anspruch 9 oder 10, dadurch gekennzeichnet, dass die Erhebungen (79) zu beiden Seiten einer Mittelachse (80) der Saugdüse (50) jeweils über ein Viertel der Gesamtbreite der Abstreiflippe (62) verteilt angeordnet sind.
12. 12. Saugdüse nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass zumindest eine Abstreiflippe (65) auswechselbar an einem Gehäuse (55) der Saugdüse (50) gehalten ist.
13. 13. Saugdüse nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Saugdüse (50) ein Gehäuse (55) umfasst mit einer ersten und einer zweiten Halbschale (56, 57), die zwischen sich ein Luftführungsteil (59) aufnehmen, wobei die erste und/oder zweite Halbschale (56) und das Luftführungsteil (59) den Saugkanal (60) definieren.
14. 14. Saugdüse nach Anspruch 13, dadurch gekennzeichnet, dass an die erste und/oder die zweite Halbschale (56) eine erste flexible Abstreiflippe (62) angeformt ist.
15. 15. Saugdüse nach Anspruch 14, dadurch gekennzeichnet, dass die erste oder die zweite Halbschale (56) und die erste flexible Abstreiflippe (62) gemeinsam ein Spritzgussteil mit zwei Komponenten ausbilden.
16. 16. Saugdüse nach einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, dass zwischen das Luftführungsteil (59) und die erste oder zweite Halbschale (57) eine zweite flexible Abstreiflippe (65) eingespannt ist.
17. 17. Saugdüse nach Anspruch 16, dadurch gekennzeichnet, dass das Luftführungsteil (59) und die erste oder zweite Halbschale (57) gemeinsam eine Aufnahme (69) ausbilden, die eine dem Saugkanal (60) zugewandte Hinterkante (67) der zweiten flexiblen Abstreiflippe (65) aufnimmt.
18. 18. Hartflächenabsauggerät mit einem Saugaggregat (16), einem Schmutzflüssigkeitstank (23) und einer Abscheideeinrichtung (40) zum Abscheiden von Flüssigkeit aus einem angesaugten Flüssigkeits-Luftgemisch, und mit einer Saugdüse (50) nach einem der voranstehenden Ansprüche.
19. 19. Hartflächenabsauggerät nach Anspruch 18, dadurch gekennzeichnet, dass das Hartflächenabsauggerät (10) eine wiederaufladbare Energiequelle (19) aufweist.
20. 20. Hartflächenabsauggerät nach Anspruch 18 oder 19, dadurch gekennzeichnet, dass das Hartflächensauggerät tragbar ausgestaltet ist.
21. 21. Hartflächenabsauggerät nach Anspruch 18, 19 oder 20, dadurch gekennzeichnet, dass das Hartflächenabsauggerät (10) einen Aufnahmeschacht (43) aufweist, in den der dem Saugmund (70) abgewandte hintere Endbereich (72) des Saugkanals (60) einsetzbar ist.
22. 22. Hartflächenabsauggerät nach einem der Ansprüche 18 bis 21, dadurch gekennzeichnet, dass das Hartflächenabsauggerät (10) stromaufwärts des Saugaggregats (16) eine Abscheidekammer (33) aufweist, die die Abscheideeinrichtung (40) aufnimmt und die über eine Ablauföffnung (113) mit dem Schmutzflüssigkeitstank (23) verbunden ist.
23. 23. Hartflächenabsauggerät nach Anspruch 22, dadurch gekennzeichnet, dass der dem Saugmund (70) abgewandte hintere Endbereich (72) des Saugkanals (60) und/oder der dem Saugmund (70) zugewandte vordere Endbereich (107) einer das Saugaggregat (16) mit der Abscheidekammer (33) verbindenden Absaugleitung (105) innerhalb der Abscheidekammer (33) in Umfangsrichtung zumindest teilweise von mindestens einem Zwischenspeicherbereich (117, 118, 119) für abgeschiedene Flüssigkeit umgeben sind.
24. 24. Hartflächenabsauggerät nach Anspruch 23, dadurch gekennzeichnet, dass der hintere Endbereich (72) des Saugkanals (60) in einen in die Abscheidekammer (33) hineinragenden Aufnahmeschacht (43) eintaucht, wobei der Aufnahmeschacht (43) und mindestens eine Außenwand (36, 37) der Abscheidekammer (33) zumindest einen Zwischenspeicherbereich (117, 118) definiert.
25. 25. Hartflächenabsauggerät nach Anspruch 23 oder 24, dadurch gekennzeichnet, dass der vordere Endbereich (107) der Absaugleitung (105) in die Abscheidekammer (33) hineinragt und innerhalb der Abscheidekammer (33) in Umfangsrichtung von einem ringförmigen Zwischenspeicherbereich (119) umgeben ist.
26. 26. Hartflächenabsauggerät nach einem der Ansprüche 23 bis 25, dadurch gekennzeichnet, dass sich zumindest ein Zwischenspeicherbereich (117, 118, 119) in Richtung der Abscheideeinrichtung (40) erweitert.

The invention further relates to the following specific embodiments of the invention:

1. 1. Suction nozzle, in particular for a Hartflächenabsauggerät, with a suction mouth, to which a suction channel connects, at its end remote from the suction mouth a vacuum source is connectable to form a suction flow, wherein the suction channel is a bottom wall and a ceiling wall which are interconnected by side walls, characterized in that the side walls (84, 85) are arcuately curved.
2. 2. Suction nozzle according to claim 1, characterized in that the side walls (84, 85) are curved arcuately virtually over its entire length.
3. 3. Suction nozzle according to claim 1 or 2, characterized in that the side walls (84, 85) in its suction mouth (70) facing the front end portion (97, 98) perpendicular to a central axis (80) of the suction nozzle (50) and in their the suction end (70) facing away from the rear end portion (101, 102) parallel to the central axis (80) of the suction nozzle (50) are aligned.
4. 4. Suction nozzle according to one of the preceding claims, characterized in that at least in a longitudinal section of the suction channel (60) of the distance of the ceiling wall (83) of the bottom wall (82) in the side walls (84, 85) adjacent lateral edge regions of the suction channel (60) is greater than in a central region of the suction channel (60).
5. 5. Suction nozzle according to claim 4, characterized in that the bottom wall (82) and / or the top wall (83) at least in a longitudinal section of the suction channel (60) in a direction perpendicular to the central axis (80) of the suction nozzle (50) extending cutting plane arcuate in the interior of the suction channel (50) is curved.
6. 6. Suction nozzle according to one of the preceding claims, characterized in that the bottom wall (82) and / or the top wall (83) at least in a longitudinal section of the suction channel (60) in a parallel curved to the central axis (80) of the suction nozzle (50) extending cutting plane in the interior of the suction channel (60).
7. 7. Suction nozzle according to one of the preceding claims, characterized in that the suction nozzle (50) has two flexible wiper lips (62, 65) which define the suction mouth (70).
8. 8. Suction nozzle according to claim 7, characterized in that one of the two wiper lips (62) has at its free, from the suction channel (60) projecting front edge (73) recesses (78).
9. 9. Suction nozzle according to claim 7 or 8, characterized in that at least one of the two wiper lips (62) in the region of the suction mouth (70), the other wiper lip (65) facing, a plurality of elevations (79).
10. 10. Suction nozzle according to claim 9, characterized in that the elevations (79) are distributed over only a portion of the wiper lip (62).
11. 11. Suction nozzle according to claim 9 or 10, characterized in that the elevations (79) are arranged distributed on both sides of a central axis (80) of the suction nozzle (50) each over a quarter of the total width of the wiper lip (62).
12. 12. Suction nozzle according to one of the preceding claims, characterized in that at least one wiper lip (65) is replaceably held on a housing (55) of the suction nozzle (50).
13. 13. Suction nozzle according to one of the preceding claims, characterized in that the suction nozzle (50) comprises a housing (55) having a first and second half-shells (56, 57) receiving therebetween an air guide member (59), the first and / or second half-shells (56) and the air guide member (59) defining the suction channel (60).
14. 14. Suction nozzle according to claim 13, characterized in that on the first and / or the second half-shell (56) a first flexible wiper lip (62) is integrally formed.
15. 15. Suction nozzle according to claim 14, characterized in that the first or the second half-shell (56) and the first flexible wiper lip (62) together form an injection molded part with two components.
16. 16. Suction nozzle according to one of claims 13 to 15, characterized in that between the air guide part (59) and the first or second half-shell (57) a second flexible wiper lip (65) is clamped.
17. 17. Suction nozzle according to claim 16, characterized in that the air guide part (59) and the first or second half-shell (57) together form a receptacle (69) which has a suction channel (60) facing the trailing edge (67) of the second flexible wiper lip (57). 65).
18. 18. Hartflächenabsauggerät with a suction unit (16), a dirty liquid tank (23) and a separation device (40) for separating liquid from a sucked liquid-air mixture, and with a suction nozzle (50) according to any one of the preceding claims.
19. 19. Hartflächenabsauggerät according to claim 18, characterized in that the Hartflächenabsauggerät (10) has a rechargeable energy source (19).
20. 20. Hartflächenabsauggerät according to claim 18 or 19, characterized in that the hard surface suction device is designed to be portable.
21. 21. Hartflächenabsauggerät according to claim 18, 19 or 20, characterized in that the Hartflächenabsauggerät (10) has a receiving shaft (43) into which the suction mouth (70) facing away from the rear end portion (72) of the suction channel (60) can be inserted.
22. 22. Hartflächenabsauggerät according to one of claims 18 to 21, characterized in that the Hartflächenabsauggerät (10) upstream of the suction unit (16) has a deposition chamber (33) which receives the separation device (40) and via a drain opening (113) with the Dirty liquid tank (23) is connected.
23. 23. Hartflächenabsauggerät according to claim 22, characterized in that the suction mouth (70) facing away from the rear end portion (72) of the suction channel (60) and / or the suction mouth (70) facing the front end portion (107) of the suction unit (16) The suction line (105) connecting the separation chamber (33) within the separation chamber (33) in the circumferential direction is at least partially surrounded by at least one intermediate storage area (117, 118, 119) for separated liquid.
24. 24. Hartflächenabsauggerät according to claim 23, characterized in that the rear end portion (72) of the suction channel (60) in a in the deposition chamber (33) projecting receiving shaft (43) is immersed, wherein the receiving shaft (43) and at least one outer wall (36, 37) of the deposition chamber (33) defines at least one intermediate storage area (117, 118).
25. 25. Hartflächenabsauggerät according to claim 23 or 24, characterized in that the front end portion (107) of the suction line (105) protrudes into the deposition chamber (33) and within the deposition chamber (33) in the circumferential direction of an annular intermediate storage area (119) is surrounded.
26. 26. Hartflächenabsauggerät according to any one of claims 23 to 25, characterized in that extends at least one intermediate storage area (117, 118, 119) in the direction of the separation device (40).

Claims (25)

Suction nozzle, in particular for a Hartflächenabsauggerät, with a suction mouth (70) to which a suction channel (60) adjoins the suction mouth (70) facing away from the end of a vacuum source is connected to form a suction flow, wherein the suction channel (60) has a bottom wall (82) and a ceiling wall (83) which are interconnected by arcuately curved side walls (84, 85), characterized in that the suction nozzle (50) comprises a housing (55) having a first and a second half-shell (56, 57) receiving therebetween an air guide member (59), wherein the first and / or second half-shell (56) and the air guide member (59) define the suction channel (60). Suction nozzle according to claim 1, characterized in that on the first and / or the second half-shell (56), a first flexible wiper lip (62) is integrally formed. Suction nozzle according to claim 2, characterized in that the first or the second half-shell (56) and the first flexible wiper lip (62) together form an injection-molded part with two components. Suction nozzle according to one of the preceding claims, characterized in that between the air guide part (59) and the first or second half-shell (57) a second flexible wiper lip (65) is clamped. Suction nozzle according to claim 4, characterized in that the air guide part (59) and the first or second half-shell (57) together a Forming a receptacle (69) which receives a suction edge (60) facing the trailing edge (67) of the second flexible wiper lip (65). Suction nozzle according to one of the preceding claims, characterized in that the side walls (84, 85) are arcuately curved over practically their entire length. Suction nozzle according to one of the preceding claims, characterized in that the side walls (84, 85) in their suction mouth (70) facing the front end portion (97, 98) perpendicular to a central axis (80) of the suction nozzle (50) and in their suction mouth (70) facing away from the rear end portion (101, 102) parallel to the central axis (80) of the suction nozzle (50) are aligned. Suction nozzle according to one of the preceding claims, characterized in that at least in a longitudinal section of the suction channel (60), the distance of the top wall (83) from the bottom wall (82) in the side edge regions of the suction channel (60 ) is greater than in a central region of the suction channel (60). Suction nozzle according to claim 8, characterized in that the bottom wall (82) and / or the top wall (83) at least in a longitudinal section of the suction channel (60) in a direction perpendicular to the central axis (80) of the suction nozzle (50) extending cutting plane arcuately into the interior of the suction channel (50) is curved. Suction nozzle according to one of the preceding claims, characterized in that the bottom wall (82) and / or the top wall (83) at least in a longitudinal section of the suction channel (60) in a parallel curved to the central axis (80) of the suction nozzle (50) extending cutting plane in the interior of the suction channel (60). Suction nozzle according to one of the preceding claims, characterized in that the suction nozzle (50) has two flexible wiper lips (62, 65) which define the suction mouth (70). Suction nozzle according to claim 11, characterized in that one of the two wiper lips (62) has at its free, from the suction channel (60) projecting front edge (73) recesses (78). Suction nozzle according to claim 11 or 12, characterized in that at least one of the two wiper lips (62) in the region of the suction mouth (70), the other wiper lip (65) facing, a plurality of elevations (79). Suction nozzle according to claim 13, characterized in that the elevations (79) are distributed over only a portion of the wiper lip (62). Suction nozzle according to claim 13 or 14, characterized in that the elevations (79) are arranged distributed on both sides of a central axis (80) of the suction nozzle (50) each over a quarter of the total width of the wiper lip (62). Suction nozzle according to one of the preceding claims, characterized in that at least one wiper lip (65) is replaceably held on a housing (55) of the suction nozzle (50). Hartflächenabsauggerät with a suction unit (16), a dirty liquid tank (23) and a separator (40) for depositing of liquid from a sucked liquid-air mixture, and with a suction nozzle (50) according to any one of the preceding claims. Hard surface suction device according to claim 17, characterized in that the Hartflächenabsauggerät (10) comprises a rechargeable energy source (19). Hard surface suction according to claim 17 or 18, characterized in that the hard surface suction device is designed to be portable. Hard surface suction device according to claim 17, 18 or 19, characterized in that the Hartflächenabsauggerät (10) has a receiving shaft (43) into which the suction mouth (70) facing away from the rear end portion (72) of the suction channel (60) can be inserted. Hard surface suction device according to one of claims 17 to 20, characterized in that the Hartflächenabsauggerät (10) upstream of the suction unit (16) has a separation chamber (33) which receives the separation device (40) and via a drain opening (113) with the dirty liquid tank ( 23) is connected. Hard surface suction device according to claim 21, characterized in that the suction mouth (70) facing away from the rear end portion (72) of the suction channel (60) and / or the suction mouth (70) facing the front end portion (107) of the suction unit (16) with the deposition chamber (33) connecting the suction line (105) within the separation chamber (33) in the circumferential direction at least partially surrounded by at least one intermediate storage area (117, 118, 119) for separated liquid. Hard surface suction device according to claim 22, characterized in that the rear end region (72) of the suction channel (60) dips into a receiving shaft (43) projecting into the separation chamber (33), the receiving shaft (43) and at least one outer wall (36, 37). the deposition chamber (33) defines at least one intermediate storage area (117, 118). Hard surface suction device according to claim 22 or 23, characterized in that the front end region (107) of the suction line (105) projects into the separation chamber (33) and is surrounded within the separation chamber (33) in the circumferential direction by an annular intermediate storage region (119). Hard surface suction device according to one of claims 22 to 24, characterized in that at least one intermediate storage area (117, 118, 119) widens in the direction of the separation device (40).

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