ES2399199T3 - Suction nozzle - Google Patents

Abstract

Suction nozzle, in particular for a hard surface aspiration apparatus, with a suction mouth (70) which is continued with a suction channel (60) at whose end away from the suction mouth (70) a source of depression to form a suction flow, the suction channel (60) presenting a bottom wall (82) and a cover wall (83) that are joined together by means of curved side walls (84, 85) in the form of arc, characterized in that at least in a longitudinal section of the suction channel (60) the separation between the cover wall (83) and the bottom wall (82) is greater in the lateral edge areas of the suction channel (60) adjacent to the side walls (84, 85) than in a central area of the suction channel (60).

Description

Suction nozzle

The invention relates to a suction nozzle, in particular for a hard surface vacuum equipment, with an aspiration mouth to which an aspiration channel is connected at the end of which a source of depression can be connected away from the aspiration mouth to form a suction current, for which the suction channel has a bottom wall and a cover wall that are joined together through curved arc-shaped side walls. At least one flexible scraper lip is preferably located in the suction mouth.

In order to vacuum hard surfaces, for example tiled walls or tiled floors and also to remove a film of water from the glass of windows or glass doors, hard surface suction equipment comprising a source of depression in the form of a depression can be used. suction equipment as well as a suction nozzle that is in rheological communication with the suction equipment and whose suction mouth can be applied to the hard surface that is to be aspirated. A suction flow can then be generated by the suction equipment so that dirt and water are sucked through the suction nozzle from the hard surface so that they can be taken to a dirt container of the hard surface suction equipment . This kind of suction equipment for hard surfaces with a suction nozzle is known for example from US Pat. Nos. 3,254,360 and 3,118,165. Furthermore, such hard surface suction equipment with a suitable suction nozzle is described in DE 25 55 648 A1.

A hard surface suction device in the form of a dust aspirator is known from US.

1,856,136. This dust aspirator comprises a suction mouth to which a suction channel is connected. At the end of the suction channel away from the suction mouth a source of depression is connected, so that a suction flow can be formed. The suction channel has a bottom wall and a cover wall that are joined together by means of curved arc-shaped side walls. A corresponding configuration is also disclosed in US 5,937,475.

In order to achieve an effective cleaning effect, it is necessary to cause as intense a suction flow as possible in the area of the suction mouth so that dirt particles and / or water droplets can be safely captured by the flow of aspiration. To achieve a correspondingly intense suction flow, a large suction device can be used. Now, this requires considerable construction space. It is also necessary to provide a source of energy with correspondingly large dimensions. In addition to this, large suction equipment entails non-negligible noise formation.

The objective of the present invention is to improve an aspiration nozzle of the class mentioned above in such a way that by connecting the aspiration nozzle to a source of depression an effective aspiration flow is formed in the area of the aspiration mouth, with a the lowest possible consumption of energy from the source of depression.

This objective is solved by means of a suction nozzle that has the characteristics of claim 1.

It has been observed that through the arrangement of curved arc-shaped side walls flow losses in the suction channel can be significantly reduced, so that an effective suction flow can be achieved in the area of the suction nozzle with a source of depression of relatively small dimensions. This allows in particular the formation of an effective suction flow in a portable suction device for hard surfaces and with a rechargeable energy source, for example a lithium ion accumulator.

In addition to this, the curved arc-shaped side walls offer the advantage that a suction flow can be achieved inside the suction channel with a gradient as small as possible to the flow rate. In this way, the risk that air with little movement or even without movement on air with intense movement can be reduced in the suction channel, and that for this reason whirlpools are formed. This class of whirlpools represent areas of the suction flow with very low flow rates (the so-called "dead spots") and can result in the separation of dirt or water particles within the suction channel, so that the particles and aspirated drops in the area of the suction mouth are only transported insufficiently through the entire suction channel. The risk of whirlwinds forming inside the suction channel is greatly reduced by the arrangement of curved arc-shaped side walls. In this way, not only can the flow losses be reduced, but also the risk of separation of the particles and droplets of entrained liquid.

A further reduction of the flow losses inside the suction channel as well as an additional reduction of the risk of whirling is achieved in accordance with the invention because at least in a longitudinal section of the suction channel, the distance of the Cover wall to the bottom wall is larger in the areas of the edge of the suction channel adjacent to the side walls, than in the central area of the suction channel. The flow section of the suction channel therefore increases starting from the central zone towards the areas of the lateral edges. The consequence of this is that the speed of the suction flow in the edge areas is less than in the central area. The reduced flow rate in the edge areas results in less friction of the suction flow in the side walls, since the friction depends on the speed of the suction flow. It has been found that in this way the risk of whirlwind formation and therefore the risk of "dead spots" forming in the suction flow can be counteracted particularly effectively. This reduces the risk of dirt particles or liquid drops separating inside the suction channel.

It is especially advantageous if the side walls have an arc-shaped curvature practically along their entire length. In such a configuration the side walls are curved in an arc shape from their front end near the suction mouth to their rear end away from the suction mouth; in any case, they have a straight wall section at their front and / or rear end. It has been found that in this way flow losses can be reduced in a particularly notable manner.

It is especially advantageous if the side walls have an orientation perpendicular to a central axis of the suction nozzle at its front end near the suction nozzle, and in the area of its rear end away from the suction nozzle have an orientation parallel to the central axis of the suction nozzle. In their area of the front end, the side walls may form a rear wall of the suction channel facing the suction mouth, and in their area of the rear end they may have an orientation parallel to the direction of the suction flow. It has been found that in this way the formation of whirlpools inside the suction channel can be effectively counteracted.

The side walls may have an arc-shaped curvature of a circle with a uniform radius of curvature. However, it is especially advantageous if the radius of curvature of the side walls varies from its anterior extreme zone to its posterior posterior zone. A continuous variation of the radius of curvature of the side walls from its front end to its rear end has been especially advantageous. In this way, the side walls can have a very large radius of curvature in their area of the front end and in their area of the rear end which, in the direction towards the central section of the suction channel, is preferably reduced continuously.

It is convenient that the bottom wall and / or the cover wall have an arc-shaped curvature towards the inside of the suction channel, at least in a longitudinal section of the suction channel, in a sectional plane that runs in the transverse direction to the central axis of the suction nozzle. In such a configuration, therefore, it is not only the side walls that at least have an arc-shaped layout at least in areas, but also the bottom wall and / or the cover wall is also curved in an arc shape. in a section plane that runs in the transverse direction to the central axis of the suction nozzle. The bottom wall and / or the cover wall thus form a kind of "dent" or strict zone of the suction channel. In this way, the formation of flow zones with reduced flow velocity ("dead spaces") can be counteracted. This avoids the risk of stationary air on moving air, that is to say that there are large velocity gradients, and this also avoids the risk of whirling and dirt particles and / or drops being deposited. of liquid

The bottom wall and / or the cover wall are preferably curved in an arc towards the inside of the suction channel, at least in a longitudinal section of the suction channel and in a section plane that runs parallel to the central axis of the suction channel. Thus, the suction channel can have a smaller flow section in a zone between the suction mouth and the far end of the suction mouth than in the area of the suction mouth and in the area of the far end of the suction mouth. suction mouth Therefore, starting from the suction mouth the flow section can first be reduced in the direction towards the end of the suction channel away from the suction mouth, in particular a continuous decrease can be provided, and after passing the section With a narrower flow, this can be increased again in the direction towards the far end of the suction mouth, in particular a continuous increase can be provided. In this way, a particularly effective cleaning effect can be achieved with a depression source of relatively small dimensions, where dirt particles and liquid drops are not segregated inside the suction channel.

It is especially advantageous if the suction nozzle has two flexible scraper lips that define the suction mouth between them. The scraping lips can have different thickness of material. The material thickness of a first scraper lip may, for example, be less than half, in particular less than a third of the material thickness of the second scraper lip.

It is convenient if one of the two scraper lips has recesses at its free front edge, away from the suction channel. The recesses are preferably open towards the leading edge. The two front edges define the suction mouth with each other and due to the recesses in one of the two front edges, some flow passages are defined in which the flow current has a high flow rate, so that the moisture particles and / or liquid droplets are dragged in an especially effective manner and can be aspirated into the suction channel.

The recesses of one of the scraper lips are preferably covered by the leading edge of the other scraper lip. For example, the leading edge of the other scraper lip may have a straight line. This scraper lip can therefore act as a sweeping lip, in front of which the liquid that is to be aspirated and which can be aspirated through the suction mouth accumulates.

It is convenient if at least one of the two scraper lips has a plurality of protrusions in the area of the suction mouth and oriented towards the other scraper lip. The protrusions represent spacers that ensure that the scraping lips form flow passages for the suction flow and the dirt particles and the droplets of entrained liquid, even if they are directly attached to each other.

Preferably, at least one scraper lip is interchangeably fastened in a housing of the suction nozzle. This facilitates assembly and eventually also the repair of the suction nozzle. In addition, in this way one of the two scraper lips that is preferably used can be turned relative to the other scraper lip if the area of the leading edge that touches the hard surface has suffered wear. In this way, the life of the hard surface aspiration equipment can be extended.

In a particularly preferred embodiment, the suction nozzle comprises a housing with a first and second half-casing which between them houses an air conduction part, where the first and / or the second semi-package and the air conduction part define the suction channel. In such a configuration, the suction channel is not defined exclusively by the suction nozzle housing but additionally an air duct is used between the two half-packages of the suction nozzle housing. The air duct allows optimizing the geometry of the suction channel without affecting the appearance of the suction nozzle. The external appearance of the suction nozzle can therefore be adapted to the rest of the aspect of hard surface suction equipment, without taking into account the geometry of the suction channel. The appearance of the air conduction piece can also be chosen with a view to obtaining an optimum suction flow without having to pay attention to the external appearance of the suction nozzle. For example, a narrowing of the section of the suction channel can be achieved by means of the air duct without this being recognized directly in the suction nozzle housing.

In a preferred configuration of the invention, the air conduction piece can be placed during the assembly of the suction nozzle between the two half-packages, and then the two half-packages can be joined together, preferably releasably. To join the two semi-packages, for example, a pressure, interlock or screw connection can be used.

In a preferred configuration, a first flexible scraper lip is molded in the first or second half-case of the housing.

In particular, it may be provided that the first or second half-pack and the first flexible scraper lip form a cast piece injected in one piece with two components. In the case of a configuration of this class, the first or second half-package is applied in combination with the first flexible scraper lip by means of a two-component injected casting procedure, in which different plastics can be used. The first or second half-package can be made, for example, of an ABS material and for the first flexible scraper lip a rubber-like plastic material can be used.

In a preferred embodiment there is a second flexible scraper lip moored between the air conduction piece and the first or second half-package.

In this case it is advantageous if the air conduction piece and the first or second half-disk together form a housing in which the second flexible scraper lip is located at the rear edge close to the suction channel. The trailing edge preferably forms a positive connection with the housing.

As already mentioned, the suction nozzle according to the invention allows an effective suction flow to be formed in a portable hard surface aspiration apparatus, for example an apparatus for vacuuming window panes, by which a suction can be aspirated. liquid film of the window pane. For this purpose, the hard surface aspiration equipment has a suction equipment, a dirty liquid reservoir and a separating device for separating the liquid from an aspirated mixture of liquid and air. The hard surface aspiration apparatus further comprises a suction nozzle of the kind described above. An effective aspiration flow is formed by the suction nozzle and with reduced energy consumption of the vacuum equipment, so that the liquid droplets of a hard surface can be sucked efficiently. Liquid drops are carried along by the aspiration flow. Inside the hard surface vacuum cleaner they hit a separating device and are collected in a dirty liquid reservoir. The use of the suction nozzle described above for the hard surface aspiration apparatus has the advantage that virtually no liquid drops are secreted inside the suction channel.

An advantageous embodiment of the hard surface aspiration apparatus is characterized by including a rechargeable energy source, in particular a lithium ion accumulator. This facilitates the operation of the device, especially if the device is made portable and can be held by the user with one hand. The rechargeable energy source is preferably located within the housing of the hard surface aspiration apparatus.

The hard surface aspiration apparatus preferably comprises a housing gallery, into which the end of the suction channel can be inserted away from the suction mouth. The accommodation gallery therefore supports the rear end of the suction channel. An embodiment of this type is especially advantageous if the suction nozzle is releasably supported in a housing of the hard surface aspiration apparatus, since by inserting the rear end of the suction channel into the housing gallery the risk of that the rear end of the suction channel suffers some mechanical damage is very small.

In order to avoid that the suction flow is impaired during the operation of the hard surface aspiration apparatus due to increasing the level of liquid in the dirty liquid reservoir, it is advantageous that the hard surface aspiration apparatus has a current above the suction device a separation chamber in which the separation device is housed and communicated with the dirty liquid reservoir through a discharge orifice. In an embodiment of this class, the suction flow passes through the outside of the dirty liquid tank and therefore is not influenced by the level of the liquid accumulated in the dirty liquid tank. Rather, an independent separation chamber is used in which the separation device is housed and which is located in the flow path between the suction nozzle and the suction equipment. The separation device can be made in the form of a separating wall that is preferably curved in an arc shape in order to keep the flow losses reduced. A mixture of air and liquid falls on the separation wall by sucking a film of water from a hard surface. The liquid separates into the separation wall, and through the discharge hole of the separation chamber is conducted to the dirty liquid reservoir. On the other hand, the air surrounds the separation wall and reaches the suction unit, and it can be transported by the outside through air vents made in the hard surface suction device housing.

The hard surface aspiration apparatus is preferably provided with a handle. This can be hollow, so that a suction duct can be passed through the handle. In this way, a particularly compact form of construction can be achieved for the hard surface aspiration apparatus.

In a particularly preferred embodiment of the hard surface aspiration apparatus, the rear end zone of the suction channel away from the suction mouth and / or the front end area oriented towards the suction mouth of a suction duct communicating the group of Aspiration with the separation chamber are surrounded inside the separation chamber and in peripheral direction at least partially of at least one intermediate accumulation zone for the separated liquid. The arrangement of at least one intermediate storage area gives the user the possibility of using the hard surface aspiration apparatus not only in an upright position, but also in an inclined position with respect to the vertical, and in particular it is possible to work with the hard surface aspiration apparatus also above the head, such that the aspiration nozzle is located below the aspiration equipment. The liquid that has been separated inside the separation chamber can accumulate in these cases of application firstly within the separation chamber in one or several intermediate storage areas surrounding the rear end zone of the suction channel that penetrates the chamber. of separation and / or the anterior end zone of the suction duct that penetrates the separation chamber. If at a later time the hard surface aspiration apparatus is once again used in an upright position then the liquid can flow from the at least one intermediate storage area through the discharge hole to the dirty liquid reservoir. Such a configuration of the hard surface aspiration apparatus is therefore characterized not only by the effectiveness of its cleaning effect but also the hard surface aspiration apparatus can be used to aspirate a water film from the window panes. , driving it along the window pane in the same way as is known for the handling of the usual window cleaning devices in which the liquid applied on the window pane is manually removed from the window pane by a scraper It features a rubber lip.

It is convenient that the rear end zone of the suction channel enters into a housing gallery that penetrates into the separation chamber, in which case the accommodation gallery and at least one outer wall of the separation chamber define at least a buffer zone. The housing gallery forms a support for the rear end zone of the suction channel that can support a mechanical load, and in combination with an outer wall of the separation chamber forms at least one intermediate storage area in which it can be accumulated the liquid separated into the separation chamber when the hard surface aspiration apparatus is inclined relative to the vertical or is to be used above the head.

It may be provided that the anterior end zone of the suction passage penetrates into the separation chamber, and inside the separation chamber is surrounded peripherally by an intermediate storage zone annularly. This allows to achieve an intermediate storage area of a relatively large volume, inside the separation chamber with a simple design form.

An intermediate storage area preferably widens in the direction of the separation device. This facilitates the discharge of the liquid collected first in an intermediate storage area, to the dirty liquid reservoir.

The following description of a preferred embodiment of the invention serves to provide a more detailed explanation in combination with the drawing. In this one they show:

Figure 1: a perspective representation of a hard surface aspiration apparatus;

Figure 2: A sectional view of the hard surface aspiration apparatus of Figure 1;

Figure 3: a sectional view of a suction nozzle of the hard surface aspiration apparatus;

Figure 4: a plan view of a first half-package of a housing of the suction nozzle of Figure 3;

Figure 5: a plan view of the half-package of the housing shown in Figure 4, on which an air duct is placed;

Figure 6: a sectional view along line 6-6 of Figure 5;

Figure 7: A sectional view along line 7-7 of Figure 5, and

Figure 8: A sectional view along line 8-8 of Figure 5.

In the drawing, a portable apparatus for the aspiration of hard surfaces 10 is schematically represented, by means of which liquids can be aspirated from a hard surface, for example water from a window pane. The hard surface aspiration equipment 10 can be held by the user with one hand by a handle 12, and can be driven along the hard surface in the same way as a conventional scraper carrying a rubber lip.

The hard surface aspiration apparatus 10 comprises a base housing 14 that forms the handle 12 in which it houses a suction equipment 26, a suction turbine 17 and an electric motor 18. Inside the base housing 14 is located by at least one rechargeable battery 19, in particular a lithium-ion battery, to power the electric motor 18. On the bottom, the base housing 14 forms a support surface 21 which allows the hard surface suction apparatus to be placed 10 in an upright position on a support surface as shown in Figures 1 and 2.

On one side next to the base housing is a dirty liquid reservoir 23 that can be removed from the base housing 14, into which a filling installation 25 with a discharge channel 26 and a ventilation channel 27 with parallel orientation enters to the discharge channel 26. The ventilation channel 27 protrudes from the top of the discharge channel 26. On one side, next to the filling installation 25, the dirty liquid reservoir 23 has on its side away from the handle 12 a drain hole 29 that can be closed by a cover 28.

Following from the upper part, a separation chamber 33 is followed by the base housing 14 and the dirty liquid tank 23, which is releasably connected with the housing 14 by means of a releasable interlocking connection. To release the interlocking joint, control buttons 34 are provided on the outer face of the separation chamber 33. The separation chamber 33 has external walls in the form of a concave curvature anterior wall 36, the shape of which is continued with the of the dirty liquid reservoir 23, a rear wall 37 of convex curvature that follows the handle 12 and side walls that join the front wall 36 with the rear wall 37 forming a single piece, of which in the drawing, specifically in figure 1, only one side wall 38 can be seen.

Inside the separation chamber 33 there is a separation device in the form of an impact wall 40 which is curved in an arc. On the upper part, the separation chamber 33 is limited by a cover wall 42 that joins together the front wall 36, the rear wall 37 and the two side walls 38 in one piece, on whose roof wall a gallery is molded. of housing 43 that penetrates inside the separation chamber 33.

A suction nozzle 50 which is releasably connected with the separation chamber 33 follows the upper side of the separation chamber 33. An interlocking connection is used for this purpose, with an interlocking housing 51 formed by the inner side on the anterior wall 36 of the separation chamber 33, in which an interlocking hook 52 fits, which by means of a connecting screw 53 is screwed with the housing 55 of the suction nozzle 50.

The housing 55 is formed by a first half-pack 56 that follows the front wall 36 of the separation chamber 33 and a second half-package 57 that follows the rear wall 37 of the separation chamber 33. Between the two Half-pack 56 and 57 houses an air duct piece 59 which, in combination with the first half-pack 56, defines a suction channel 60.

In the first half-pack 56 and away from the separation chamber 33, a first flexible scraper lip 62 is formed, on whose leading edge 63, away from the suction channel 60, a second scraper lip 65 with its leading edge 66 moves away from the channel of suction 60. The second scraper lip 65 is moored by its rear edge 67 near the suction channel 60 the second scraper lip 65, between the second half-pack 57 and the air conduction piece 59. The second half-pack 57 forms for it in combination with the air conduction piece 59 a housing that receives the rear edge 67 of the second scraper lip 65 with positive coupling.

The two scraper lips 62, 65 define a suction mouth 60 that continues with the suction channel 60, which with its rear end area 72 away from the suction mouth 70 penetrates the housing gallery 43 of the separation chamber 33. A support element 75 is disposed in the opening of the mouth 73 of the suction channel 60 away from the suction mouth 70, which inside the separation chamber 33, at a distance from the mouth opening 73, carries a flat shock plate 76.

As is especially apparent from FIG. 1, the suction nozzle 50 extends from the handle 12 in a transverse direction to the longitudinal extension of the handle 12, such that the scraper lips 62 and 65 extend along a multiple of the width of the base housing 14 and thus can cover the hard surface to be aspirated, in particular a window pane, on a large surface.

As can be seen clearly in FIG. 4, which shows a plan view of the first half-pack 56 that has the first scraper lip 62 formed, the leading edge 63 of the first scraper lip 62 is provided with recesses, for which at the edge front 63 and uniformly spaced from each other are formed a plurality of recesses 68 of approximately semicircular shape. In a central area of the first scraper lip 62, protrusions 79 of approximately triangular shape are located between contiguous recesses 78 on the upper face, that is, oriented towards the second scraper lip 65. In the area of the suction nozzle 70, the recesses 78 and the protrusions 79 form flow passages for a suction flow which is caused by the suction equipment 16 during operation of the hard surface aspiration apparatus 10. it can be seen from figure 4, the protrusions 79 are arranged on both sides of a central axis 80 of the suction nozzle 50, where starting from the central axis 80 they are located distributed to both sides covering a quarter of the total width of the first scraper lip 62. On the other hand, the outer end sections of the first scraper lip 62 are free of protrusions 79. In these outer end sections, however, recesses 78 are found on the leading edge 73 as in the central area.

[0048] As seen especially in Figures 7 and 8, the suction channel 60 has a bottom wall 82 formed by a central area of the first half-disk 56 as well as the first scraper lip 62. The aspiration channel 60 has furthermore a cover wall 83 which is formed by the air conduction piece 59 and by the second scraper lip 65. The suction channel 60 further comprises curved arc-shaped side walls 84, 85 that are formed by the piece of air duct 69 and are connected with the cover wall 83 forming a single piece. With their front edges 86, 87 away from the cover wall 83, the side walls 84 and 85 each form a groove 88 and 89 respectively into which a tongue 91 and 92 respectively located at the top penetrates, ie next to the second half-pack 57, of the first half-package, as well as a tongue 94 and 95 respectively formed in the first scraper lip 62 and which are next to the tongues 91 and 92 respectively. The arc-shaped layout of the side walls 84 and 85 is especially clearly seen in Figure 4, by the corresponding arc-shaped layout of the corresponding tabs 91, 92 and 94, 95. It can be seen that the side walls 84 and 85 have in their front end area 97 and 98 respectively, oriented towards the suction mouth 70, an orientation perpendicular to the central axis of the suction nozzle; and in its rear end zone 101 and 102 respectively away from the suction mouth 70, the side walls 84 and 85 have an orientation parallel to the central axis 80. Starting from their front end areas 97, 98, the side walls 84, 85 are they approach each other continuously in the direction away from the suction mouth 70, constantly varying their radius of curvature, such that the radius of curvature of the side walls 84, 85 is practically infinite and in the extreme areas anterior 97, 98 and in the posterior extreme zones 101, 102, while in an intermediate zone in the longitudinal direction of the suction channel 60 adopts a minimum value. In the front end areas 97 and 98, the side walls 84 and 85 form practically a rear wall of the suction channel 60 which is located opposite the suction mouth 70, and in its rear end areas 101 and 102 respectively the side walls 84 and 85 run parallel to the longitudinal direction of the aspiration channel 60, and therefore parallel to the aspiration flow that is formed in the aspiration channel 60.

In Figures 7 and 8 the suction channel 60 is shown in section planes oriented in the direction perpendicular to the central axis 80. There it is clearly seen that the cover wall 83 has a curvature in the direction transverse to the central axis 80 in the form of arc that penetrates inside the suction channel 60. The consequence of this is that the distance taken by the cover wall 83 with respect to the bottom wall 82 is greater in the areas of the edge of the suction channel 60 adjacent to the walls lateral 84 and 85 respectively, which in the central area of the suction channel 60. Starting from the central area, the flow section of the suction channel 60 in the direction towards the side walls 84 and 85 therefore increases. The consequence of this is that the suction flow has a lower flow rate in the areas of the edge of the suction channel 60 near the side walls 84, 85 than in the central area of the suction channel ion 60. This in turn causes a relatively reduced friction between the suction flow and the side walls 84, 85. However, the flow section is also chosen large enough in the areas of the edge of the suction channel 80 close to the side walls 84, 85 so that the dirt particles and liquid droplets aspirated by the suction mouth 70 are safely carried by the suction flow and eventually do not settle down in the suction channel 60. Due to the increase From the flow section starting from the central area of the suction channel 60 towards its edge zones, the formation of whirlpools can be avoided and therefore the formation of "dead spots" in which the flow rate is very reduced or even zero.

Therefore there is no risk that dirt particles or drops of liquid are deposited inside the suction channel 60. These are rather carried away by the suction flow that is formed and conducted from the suction mouth 60 to the separation chamber 33.

Figure 6 shows the suction channel 60 in a section plane that runs parallel to the central axis 80. Referred to this section plane, the bottom wall 82 is curved in an arc towards the interior of the suction channel 60, and also the cover wall 83 has a similar arc-shaped layout. Referring to the section plane that runs parallel to the central axis 80, the suction channel widens from a central area 104 referred to its longitudinal extension. It has been found that in this way, the formation of whirlpools and therefore of areas of very low flow velocity inside the suction channel 60 can be counteracted further.

During operation of the hard surface vacuum apparatus 10, the separation chamber 33 is subjected to a depression due to the aspiration equipment 16. For this purpose the aspiration equipment 16 is in rheological communication with the separation chamber 33 by means of a conduit of suction 105 that passes through the handle 12. A mouth area 107 of the suction duct 105 is made in the form of a pipe 108 and protrudes from the side of the impact wall 40 away from the rear end area 72 of the suction channel 60, penetrating the separation chamber 33. The opening orifice 109 of the suction duct 108 is covered by the impact wall 40 which has a convex curvature in the direction of the suction channel 60.

Because the aspiration chamber 33 is subjected to depression, an aspiration flow is formed starting from the aspiration mouth 70 through the aspiration channel 60, the separation chamber 33 and the aspiration conduit

105. The suction air that is aspirated can escape at the rear of the base case 14 through air outlets 111 arranged laterally in the base case 14.

As already explained, the hard surface aspiration apparatus 10 can be driven along the hard surface as a scraper for cleaning a hard surface, in particular a window pane or a glass door , to aspirate liquid. In doing so, a mixture of liquid and air penetrates through the suction mouth 70 and the suction channel 60 to the separation chamber 33, first impacting on the shock plate 76, located some distance from the mouth opening 73 of the suction channel 60, where a part of the entrained liquid is separated. Then the mixture of air and liquid strikes the impact wall 40 where the rest of the entrained liquid is separated, while the aspirated air surrounds the impact wall 40 and is conducted through the suction duct 105 to the suction equipment 16 The liquid that has been separated inside the separation chamber 33 can flow through the discharge channel 26 to the dirty liquid reservoir. For this purpose, the separation chamber 33 has a drain hole 113 in which a drain funnel 114 is arranged. The drain funnel 114 narrows in a direction towards the dirty liquid reservoir 23. Under the discharge funnel 114 the filling device 25 with the discharge channel 26 is located. The ventilation channel 27 passes through the discharge funnel 114 and penetrates into the separation chamber 33.

In Figures 1 and 2, the hard surface aspiration apparatus 10 is shown in an upright position in which the suction nozzle 50 adopts a position above the vertical one above the aspiration equipment 16. If the aspiration apparatus is driven of hard surfaces 10 in this upright position along a hard surface that is to be aspirated, the liquid separated inside the separation chamber 33 can pass smoothly to the drain hole 113 and through it to the liquid reservoir dirty 23. On the other hand, if the hard surface suction apparatus 10 is operated in a horizontal position, in which the suction nozzle 50 is located relative to the vertical essentially at the same height as the suction equipment 18, or if it is used the hard surface suction apparatus 10 above the head, such that the suction nozzle 50 is positioned relative to the vertical below the e suction equipment 16, then the liquid separated in the separation chamber 33 can first accumulate in the intermediate storage areas 117-119 of the separation chamber 33 until the hard surface aspiration apparatus 10 is again operating in the upright position shown in Figures 1 and 2. A first intermediate storage area 117 is located between the anterior wall 36 in the separation chamber 33 and the housing gallery 43, and a second intermediate storage area 118 is positioned between the wall rear 37 of the separation chamber 33 and the accommodation gallery 43. Both intermediate storage areas 117, 118 continuously widen in a direction towards the impact wall 40. The two intermediate storage areas 117, 118 each extend peripherally along a part of the rear end zone 72 of the suction channel 60.

A third intermediate storage zone 119 extends inside the separation chamber 33 annularly along the entire perimeter of the area of the mouth 107 of the suction duct 105. Also the third intermediate storage zone 119 is widened by continuously in the direction of the impact wall

40

In the first and second intermediate storage areas 117 and 118 the separated liquid is specially housed within the separation chamber 33, when the hard surface aspiration apparatus 10 is used in position above the head, and the third zone of Intermediate storage 119 receives the separated liquid in the separation chamber 33, especially in the horizontal working position of the hard surface aspiration apparatus 10, without the danger that the liquid that has been separated can reach the aspiration mouth 70 through the suction channel 60. If thereafter working again with the hard surface aspiration apparatus 10 in an upright position, the liquid that had accumulated in the meantime flows out of the intermediate storage areas 117, 118, 119 and through the discharge hole 113 and the discharge channel 26 passes to the dirty liquid reservoir 23.

Since the discharge channel 26 penetrates inside the dirty liquid reservoir 23, the end 121 of the discharge channel 26 penetrating the dirty liquid reservoir 23 being located in the upright position shown in Figures 1 and 2, approximately at medium height of the dirty liquid tank 23, there is no danger, even if the hard surface aspiration apparatus 10 is operated horizontally or above the head, any liquid that had already existed can leave the dirty liquid tank 23 entered into the dirty liquid tank 23. The liquid inside the dirty liquid tank 23 accumulates rather in the area of the dirty liquid tank 23 surrounding the discharge channel 26 when the surface suction apparatus hard 10 works horizontally or above the head.

Through the ventilation channel 27 which runs parallel to the discharge channel 26, the dirty liquid tank 23 can be vented in any position of the hard surface aspiration apparatus 10, so that the air can escape at all times out of the storage tank. dirty liquid 23 to be then aspirated from the separation chamber 33 through the suction duct 105.

The hard surface aspiration apparatus 10 can therefore work in any position relative to the vertical, where the liquid separated in the separation chamber 33 can either reach directly to the dirty liquid tank 23 or accumulates first in the intermediate storage areas 117, 118 and 119 of the separation chamber 33 until the hard surface aspiration apparatus 10 returns to an upright position. To form an aspiration flow and thus obtain an effective cleaning effect, only one power supply of the aspiration equipment 16 of relatively small dimensions is required, since the aspiration channel 60 exhibits only very few flow losses, and Furthermore, there is practically no risk that dirt particles or liquid droplets entrained by the suction flow are deposited inside the suction channel 60.

Claims (4)

1.- Suction nozzle, in particular for a hard surface aspiration apparatus, with an aspiration mouth (70) which is continued with an aspiration channel (60) at whose end away from the aspiration mouth (70) it is possible to connect a source of depression to form an aspiration flow, the suction channel (60) presenting a wall 5 of the bottom (82) and a cover wall (83) which are joined together by means of curved arc-shaped side walls (84, 85), characterized in that at least in a longitudinal section of the suction channel ( 60) the separation between the cover wall (83) and the bottom wall (82) is greater in the lateral edge areas of the suction channel (60) adjacent to the side walls (84, 85) than in an area central suction channel (60). 2. Suction nozzle according to claim 1, characterized in that the side walls (84, 85) have an arc-shaped curvature practically along its entire length. 3. Suction nozzle according to claim 1 or 2, characterized in that the side walls (84, 85) have an orientation perpendicular to a central axis in their front end area (97, 98) close to the suction mouth (70). (80) of the suction nozzle (50) and in its rear end area (101, 102) away from the suction mouth (70) an orientation parallel to the central axis (80) of the suction nozzle (50). 4. Suction nozzle according to one of the preceding claims, characterized in that the bottom wall (82) and / or the cover wall (83) are arched in an arc towards the inside of the suction channel (60) to the less in a longitudinal section of the suction channel (60) in a section plane that runs perpendicular to a central axis (80) of the suction nozzle (50). 5. Suction nozzle according to one of the preceding claims, characterized in that the bottom wall (82) and / or 20 the cover wall (83) are curved at least in a longitudinal section of the suction channel (60) in a section plane that runs parallel to a central axis (80) of the arc-shaped suction nozzle (50) into the suction channel (60).