EP3993684A1

EP3993684A1 - Suction appliance and method for cleaning a filter

Info

Publication number: EP3993684A1
Application number: EP20734136.3A
Authority: EP
Inventors: Felix Treitz
Original assignee: Alfred Kaercher SE and Co KG
Current assignee: Alfred Kaercher SE and Co KG
Priority date: 2019-07-03
Filing date: 2020-06-17
Publication date: 2022-05-11
Also published as: WO2021001152A1; CN114040699B; CN114040699A; US20220117453A1; CN116421096A; DE102019117920A1; CN116649830A

Abstract

The invention provides a suction appliance comprising a suction unit for generating a suction stream (40), at least one filter (22) and a filter-cleaning device (34), wherein the filter-cleaning device (34) has at least one valve (42) with a movable closing body (44) and also has an abutment device (74) for the closing body (44), and wherein, in an open position of the at least one valve (42), the at least one filter (22) is subjected to the action of a cleaning stream and, in a closed position (90) of the at least one valve (42), the cleaning stream is, or becomes, inactive, wherein the closing body (44) has at least one first bearing region (70) in relation to the abutment device (74) and a second bearing region (72) in relation to the abutment device (74), wherein the second bearing region (72) is spaced apart in a vertical direction (48) from the first bearing region (70), wherein, in the closed position (90) of the at least one valve (42), both the first bearing region (70) and the second bearing region (72) bear against the abutment device (74), and wherein, in the open position of the at least one valve (42), both the first bearing region (70) and the second bearing region (72) are spaced apart from the abutment device (74), wherein, in the open position of the at least one valve (42), a purging-air stream flows past both the first bearing region (70) and the second bearing region (72) en route to the filter (22).

Description

SUCTION DEVICE AND PROCEDURE

FOR CLEANING A FILTER

The invention relates to a suction device, comprising a suction unit for generating a suction flow, at least one filter, and a filter cleaning device, the filter cleaning device having at least one valve with a movable closing body and a counter device for the closing body, and in one In the open position of the at least one valve, the at least one filter is subjected to a cleaning stream and in a closed position of the at least one valve the cleaning stream is or becomes inactive.

The invention also relates to a method for cleaning a filter.

No. 4,329,161 discloses a vacuum cleaner with a valve system for generating air pulses through a filter element.

DE 20 2006 020 948 U1 discloses a suction cleaning device with a closing valve for cleaning a filter.

DE 10 2015 100 426 A1 discloses a cleaning device with a perforated plate resonator which is assigned to a noise source and is effectively connected to the noise source.

EP 2 451 332 B1 relates to a suction device for cleaning purposes, which comprises a valve device with a valve seat forming an external air inlet and a valve body movable relative thereto, which in a closed position rests sealingly on the valve seat and releases the valve seat in an open position. The suction device comprises an energy storage device which can be supplied with energy to be stored by actuating an actuating member and which can be released from the stored energy for transferring the valve body from a closed position to an open position. The Energy storage device comprises at least one elastically deformable energy storage element, the at least one energy storage element being designed as a spring.

DE 10 2010 029 518 A1 discloses a vacuum cleaner with a dirt collecting container, which has a suction inlet and is in flow connection with a suction unit via at least one filter and a suction line, and with a scavenging air feed device for feeding scavenging air into the suction line downstream of the filter, The scavenging air supply device has at least one scavenging air opening and a sleeve-shaped closing body which, in a closed position, prevents scavenging air from flowing into the suction line via the at least one scavenging air opening and which in one direction of movement manually prevents scavenging air from flowing into the suction line via the at least one scavenging air opening releasing release position is movable. The closing body is open at both ends and prevents in the closed position with at least two mutually interacting sealing elements that are relocatable relative to each other in the direction of movement, the flow of scavenging air through the at least one scavenging air opening into the suction line.

DE 10 2010 029 524 A1 discloses a vacuum cleaner with a dirt collecting container which has a suction inlet and is in flow connection with a suction unit via at least one filter and a suction line, and with a scavenging air supply device for feeding scavenging air into the suction line downstream of the filter, wherein the scavenging air supply device has at least one scavenging air opening and a closing body with a front side facing the suction line and a rear side facing away from the suction line, which between a closed position in which it closes the scavenging air opening and a release position in which it releases the scavenging air is reciprocable. The closing body can be moved into its release position against a restoring force by loading its rear side with negative pressure. EP 2 672 871 B1 discloses a vacuum cleaner with a battery device for supplying energy to an external air valve device. A control device is provided which controls the cleaning of a filter device by means of the external air valve device, the cleaning being triggered manually or automatically, and the control device controlling an electric motor device of a suction unit.

WO 2014/173481 A1 discloses a vacuum cleaner with cleaning control for a filter.

DE 10 2011 015 074 A1 discloses a suction device with a suction motor to which a motor sensor is assigned. The engine sensor is used to generate a suction engine sensor signal. It is a control device for driving a cleaning device for performing a cleaning process of a filter as a function of the suction motor sensor signal.

DE 10 2016 125 385 A1 discloses a vacuum cleaner.

EP 3 120 744 B1 discloses a device for controlling cleaning of a filter unit for vacuum cleaners.

DE 10 2013 108 559 A1 discloses a method for operating a vacuum cleaner to clean back a filter element comprised by the vacuum cleaner.

DE 20 2010 012 821 Ul discloses a filter cleaning system for dirt vacuums with an external fan.

DE 101 01 219 C9 discloses a vacuum cleaner.

US 2005/0011036 A1 discloses a vacuum cleaner. DE 10 2005 017 702 A1 discloses a method for cleaning the filters of a vacuum cleaner.

EP 2 347 690 B1 discloses a vacuum cleaning device.

CN 101484060 B also discloses a vacuum cleaner.

The invention is based on the object of providing a suction device of the type mentioned at the outset, wherein an effective cleaning of the min least one filter can be achieved.

This object is achieved according to the invention in the aforementioned suction device in that the closing body has at least one first contact area on the counter-device and a second contact area on the counter-device, the second contact area being at a height from the first contact area that in the closed position of the at least one valve, both the first contact area and the second contact area rest on the counter device, and that in the open position of the at least one valve, both the first contact area and the second contact area are spaced from the counter device, wherein in the open position of the at least one valve, a purge air stream flows past both the first contact area and the second contact area to the at least one filter.

Because the closing body has (at least) a first contact area and a second contact area offset from the first contact area, sealing in the closed position of the at least one valve on the mating device can be achieved over (at least) two levels. When the valve is opened, purge air can then flow into the at least one filter on (at least) two separate levels.

The open position of the at least one valve is understood to mean all positions in which the closing body is lifted from the counterpart. establishment is. It can be a plurality of positions, that is, it does not have to be a single position.

The plurality of delivery areas allows the min least one valve to be opened quickly. This in turn enables a good cleaning result for the at least one filter. It can be achieved that a large volume flow of a flushing flow (external air flow) is present at the at least one filter within a short time. It has been shown that a time profile of a volume of backwash air over the at least one filter (which results in the cleaning flow) is steep.

Furthermore, a high level for an amount of scavenging air (for an amount of cleaning air) which acts on the at least one filter results relatively quickly.

In this way, an optimized cleaning result for the at least one filter can be achieved in particular even with a suction fan with lower power, such as for example with a suction device that is battery-operated. This enables a permanently constant suction power to be achieved.

In the solution according to the invention, partial flows of scavenging air can be achieved at the at least one valve when the valve is opened. In particular, a partial flow can flow past the closing body to the at least one filter and a partial flow can flow through the closing body through to the at least one valve. Due to the at least two contact areas, which are offset in height, at least two gaps, in particular in the form of annular gaps with a relatively large diameter, can be opened quickly when the min least one valve is opened. It can be achieved that an opening cross-section increases with the valve lift. This also helps to ensure that an optimized cleaning result is achieved. It is also possible to design the first contact area and the second contact area differently with regard to a pressure-effective area. Depending on the design, it can be achieved, for example, that a pressure difference between a negative pressure and a normal pressure area keeps the closing body in the closed position of the at least one valve in the closed position, or it can be achieved that the pressure difference is aimed at the closing body to drive the at least one valve from the closed position to the open position. This also contributes to obtaining a rapid opening of the at least one valve and thereby obtaining a large air cross section.

It has also been shown that with the solution according to the invention, popping noises which are generated by the opening of the at least one valve are reduced.

The suction device according to the invention can be used, for example, in a vacuum cleaner in the form of a stand-alone device. For example, it can also be integrated into a machine that has other functions in addition to the suction device, such as a mobile one

Floor cleaning machine (like a sweeper). It can also be implemented on a robot vacuum cleaner, for example. A suction device according to the invention can, for example, also be integrated into a permanently installed suction system.

In particular, it is provided that a distance between the first contact area and the second contact area in the height direction is at least 6 mm and preferably at least 10 mm.

A movement stroke of the closing body, which is in particular a linear stroke, is in particular at least 5 mm. This movement stroke is preferably at most 50 mm. In particular, a negative pressure area is provided in a suction mode, on which the at least one filter is arranged, and a normal pressure area is provided on which the counter device is arranged, the normal pressure area of the negative pressure area being fluid-tight in the closed position of the at least one valve is separated, and in the open position of the at least one valve, the normal pressure area and the negative pressure area are fluidly connected to one another by a channel device. In “normal operation” of the suction device, without the at least one valve for cleaning the at least one filter being active, the normal pressure area is separated from the negative pressure area in a fluid-tight manner. When the at least one valve is activated to clean the min least one filter, the closing body is lifted from the opposite direction. Due to the pressure difference between the normal pressure area and the negative pressure area, a purge air flow is created which is used to clean the at least one filter. The normal pressure area is an area on which the suction unit does not act with its negative pressure. For example, there is atmospheric pressure in the normal pressure range. However, it can also be provided that in the normal pressure range there is an excess pressure compared to atmospheric pressure. For example, it is provided in the exemplary embodiment of a sweeping machine that an overpressure compared to atmospheric pressure is generated in the normal pressure range via a compressor.

In particular, the cleaning flow is generated or is generated by bringing the at least one valve from the closed position into the open position. As a result, by opening the valve, a corresponding cleaning flow can be generated “automatically” in that external air can flow in and act on at least one filter.

It is particularly advantageous if the channel device opens into the normal pressure range on the input side and into the negative pressure range on the output side. In this way, a cleaning current to act on the at least one filter can be generated in a simple manner. It is particularly advantageous if an inlet cross-section for air into the channel device, which is present in particular at a gap and preferably an annular gap, increases steadily with a valve stroke when the closing body is lifted from the counter-device. As a result, the valve can be opened quickly and a relatively large volume flow can be quickly provided to the at least one filter for cleaning.

In one embodiment, it is provided that the cleaning flow is or is generated while the suction unit acts on the at least one filter with a suction flow. As a result, the at least one valve can be cleaned to a certain extent during ongoing operation. This results in, among other things, a simple control of a cleaning process.

In particular, at least one of the following is provided: the height direction is parallel to a direction of movement and, in particular, a special direction of displacement of the closing body; the height direction is parallel to a main flow direction of a suction flow when it flows through the at least one filter in suction mode; the height direction is parallel to a main flow direction of the cleaning stream when it flows through the at least one filter; the height direction is transverse and, in particular, perpendicular to an envelope surface of the at least one filter on a clean side; the height direction is parallel to an axis of symmetry of the at least one valve. By orienting the height direction accordingly, the filter cleaning device can be designed to be compact and integrated into the suction device. A quick opening of the at least one valve can be achieved.

The counter-device preferably has a first counter-contact area for the first contact area and a second counter-contact area for the second contact area, the second counter-contact area and the first counter-contact area being spaced apart from one another in the vertical direction. In this way, in the closed position of the at least one valve, the closing body can be applied to the counter device via at least two contact areas which are offset in height. In particular, the first counter-contact area and the second counter-contact area are at a distance of at least 6 mm and preferably of at least 10 mm in the height direction. Advantageously, the counter device is designed so that when the at least one valve changes from the closed position to the open position, the first contact area and the second contact area lift at least approximately simultaneously from the counter device. Accordingly, it is preferably provided that the first contact area and the second contact area abut the mating device at least approximately at the same time during the transition of the closing body from the open position to the closed position.

In order to achieve fluid tightness in the contact areas, it is provided that the first contact area and the second contact area each have a sealing device, in particular in the form of a sealing ring, with the sealing device being arranged on the closing body and / or the sealing device is arranged on the Gegenein direction. The sealing device ensures a fluid-tight seal. It contacts the closing body and the counter device.

It is favorable if the counter device has a housing in which the closing body is movably arranged and which has a throughflow has mungsraum for purge air. The housing can be used to arrange the at least one valve in a protected manner. The housing can also be used to guide the flow.

It is favorable if a clean side of the at least one filter is located on a vacuum chamber, in particular with at least one of the following: the vacuum chamber is connected to the suction unit; In a suction mode of the suction device, the vacuum chamber is permanently connected to the suction unit in a fluidically effective manner; At least one channel of the filter cleaning device opens into the vacuum chamber for air supply to the at least one filter in a cleaning operation; the counter device is arranged on the vacuum chamber; the at least one valve separates the vacuum chamber in a closed position of the at least one valve in a fluid-tight manner from a normal pressure area.

The result is a simple flow guidance if a clean side of the min least one filter is located on a vacuum chamber. The vacuum chamber can be sealed in a simple manner in a fluid-tight manner with respect to a normal pressure area of the suction device by the at least one valve. By connecting the vacuum chamber to the suction unit and in particular by means of a permanent fluid-active connection (in suction mode), a suction flow can easily be carried out through the at least one filter, in particular to create a suction container, a suction connection and, for example, a suction hose or a suction pipe to apply the suction flow. One or more channels of the filter cleaning device, which open into the vacuum chamber can be used to provide purge air for cleaning the at least one filter.

Positioning the counter device on the vacuum chamber results in a compact structure for the suction device with the filter cleaning device.

It is favorable if the at least one valve and / or the closing body is designed to be rotationally symmetrical to the axis of symmetry, with the axis of symmetry in particular being parallel to the height direction. This results in an optimized air supply to the at least one filter in order to achieve effective cleaning.

The object mentioned at the beginning is also achieved according to the invention in that the closing body and the counter device are adapted to one another in such a way that when the at least one valve is in the open position, a plurality of separate air partial flows flows through the filter cleaning device, and in particular a first partial flow through the Closing body past the outside and a second partial flow through the closing body to which at least one filter flows. A quick opening of the at least one valve can thus be achieved in a simple manner. The at least one filter can be subjected to a large volume flow during a cleaning process.

The aforementioned object is also achieved according to the invention in that the filter cleaning device has at least one first channel for a first partial flow and a second channel for a second partial flow in the open position of the at least one valve, the second channel being separate from the first channel is. This enables the at least one valve to be opened quickly. When the at least one filter is cleaned, it can be subjected to a high volume flow of scavenging air.

In particular, at least one of the following is provided: the inlet side of the first channel opens into a normal pressure area; the inlet side of the second channel opens into the normal pressure range; the outlet of the first channel opens into a negative pressure area; the outlet of the second channel opens into the negative pressure area; In the closed position of the at least one valve, the first channel is closed on the inlet side to the normal pressure range; In the open position of the at least one valve, the first channel is open on the inlet side to the normal pressure range; the outlet side of the first channel is permanently fluidly connected to the negative pressure area; In the closed position of the at least one valve, the second channel is closed on the outlet side to the negative pressure region; In the open position of the at least one valve, the second channel is open on the outlet side to the negative pressure region; the inlet side of the second channel is permanently connected to the normal pressure area in an effective fluid manner.

It can thereby be achieved in a simple manner by lifting the closing body from the counter-device that scavenging air is supplied to the at least one filter both via the first channel and via the second channel. The at least one valve can be opened quickly and the at least one filter can be subjected to a high volume flow of scavenging air for cleaning it. It is particularly advantageous if the first channel runs through the closing body with at least a partial area, and in particular the first channel is delimited at least in a partial area by an inner wall of the closing body. In this way, at least one valve can be opened quickly. The at least one filter can be subjected to a large volume flow of scavenging air for cleaning the at least one filter within a relatively short time.

It is also advantageous if the first channel and / or the second channel runs at least in a partial area along a lateral outer contour of the closing body, and in particular a lateral outer wall of the closing body delimits the first channel and / or the second channel. An additional fluid path can thus be provided in order to achieve effective cleaning of the at least one filter when the at least one valve is open.

It is also advantageous if the first channel and / or the second channel have at least one first area and at least one second area, the at least one first area being oriented transversely to the height direction and the at least one second area at least approximately parallel is oriented to the height direction and in a cleaning operation a main flow direction in the at least one first area is oriented transversely to the height direction and in particular is oriented radially, and in the at least one second area a main flow direction in the cleaning operation is at least approximately parallel to the height direction and is particularly axially oriented. In this way, the at least one valve can be opened quickly. A relatively high volume flow can quickly be made available to the at least one filter for cleaning.

It is then advantageous if the first channel and / or the second channel have a deflection area for a flow deflection. In this way, purge air can be effectively fed to the at least filter for cleaning purposes on the at least one filter. In particular, at least one of the following is provided: at least one inlet of the first channel is arranged on a first region of the first channel; at least one outlet of the first channel is arranged in a second region of the first channel; at least one inlet of the second channel is arranged in a first region of the second channel; at least one outlet of the second channel is arranged in a second region of the second channel.

In this way, effective flow guidance can be achieved with a compact design of the filter cleaning device. The at least one valve can be opened quickly and a high volume flow can be provided to the at least one filter for cleaning.

In one embodiment, the first channel and / or the second channel have first regions which are spaced apart in the height direction and between which there is a second region. This results in an optimized flow guidance with deflection in order to provide the at least one filter with a high volume flow of scavenging air for cleaning.

In particular, at least one of the following is provided: in the open position of the at least one valve, a first region of the first channel is formed between an upper side of the closing body and the counter device; a second region of the first channel is formed in the closing body; in the open position of the at least one valve, one or more first areas of the second channel and / or the first channel and / or one or more second areas of the second channel and / or the first channel are formed between the counter-device and the closing body; in the open position of the at least one valve, a first loading area of the second channel is formed between an underside of the closing body and the counter device.

This results in an optimized flow guidance. It can be achieved that when at least one valve is open, scavenging air flows through both the

Closing body through and past the closing body to which at least one filter is fed. The at least one valve can be opened quickly with relatively little noise development and the at least one filter can be provided with a relatively large volume flow for cleaning the at least one filter.

In one embodiment, at least one of the following is provided: the first channel has at least one first inlet and one second inlet spaced apart from the first inlet; the first channel is T-shaped in cross section at least in a partial area; The first channel has a transverse area at which the first inlet and the second inlet are arranged, a collecting area being arranged at the transverse area, and a first partial flow starting from the first input to the collecting area and a second partial flow starting from the second input each flowing to the collecting area; the first channel has a collecting area which combines partial flows and a combined flow is passed through the closing body to the at least one filter.

Purge air can be coupled in at different points for a partial flow through the first input and the second input. For example, a first partial flow is generated, which flows radially inward, and a second partial flow is generated, which flows radially outward. This partial flow is combined at the collecting area and can then flow through the closing body. (There is also at least one further partial flow which flows past the flushing body.) In this way, a large amount of flushing air can be made available to the at least one filter for cleaning within a short time. The at least one valve can be opened quickly.

It is then advantageous if the first contact area and / or the second contact area has a plurality of sub-contact areas, in particular with at least one of the following:

Sub-contact areas of the associated first contact area are based on the height direction at the same height;

Sub-contact areas of the second contact area are at the same height in relation to the height direction; a first sub-plant area surrounds a second sub-plant area;

Sub-contact areas are concentric to one another; A channel is led through the closing body between the sub-contact areas. It can thus be achieved in particular that the first channel has a plurality of inputs, these inputs being closed in the closed position of the at least one valve.

In one embodiment, the closing body has a first disc element and a second disc element spaced apart from the first disc element in the vertical direction, the first contact area being arranged or formed on the first disc element and the second contact area being arranged or formed on the second disc element, and wherein a connection area is positioned between the first disk element and the second disk element. The first disk element and the second disk element allow contact areas to be formed in a simple manner towards an upper side and towards a lower side. A wall of the counter device can be positioned between the first pane element and the second pane element in order to obtain an optimized supply of scavenging air to the at least one filter during a cleaning process. The first disk element and / or the second disk element have a circular disk shape, for example.

In particular, an outer contour of the connection area is set back relative to a lateral end of the first disk element and the second disk element. A partial flow of scavenging air can flow past this outer contour. By resetting the outer contour, a wall of the counter device can be positioned between the first disk element and the second disk element. The closing body can then be moved with respect to the wall, in particular a contact (for example via the first contact area) on this wall being possible. In this way, both a first channel and a second channel for supplying scavenging air to the at least one filter can be opened in a simple manner when the at least one valve is opened.

For example, the closing body is C-shaped or U-shaped in cross section at the connection area. This is a very easy way to create a Achieve recessed outer contour where, for example, a wall between the first disk element and the second disk element can be positioned.

It is particularly advantageous if the counter-device has a wall which protrudes into a space between the first disk element and the second disk element, the first contact area being in contact with the wall, particularly in the closed position of the at least one valve. This results in a compact design of the filter cleaning device. It is possible to open at least two separate channels for two separate partial flows by lifting the closing body from the counter device. This results in rapid opening of the at least one valve.

In particular, it is provided that the first contact area and the second contact area point in the same direction in relation to the height direction. The result is a compact structure.

In one embodiment, the first contact area on the first disk element points away from the at least one filter and the second contact area on the second disk element points away from the at least one filter. In an alternative embodiment, the first contact area on the first pane element faces the at least one filter and the second contact area on the second pane element likewise faces the at least one filter.

It is particularly advantageous if the first disk element and the second disk element have different diameters. Depending on whether the first disk element or the second disk element have a larger pressure-effective diameter, the closing body can be automatically activated by the counter device due to a pressure difference between a negative pressure area and a normal pressure area lift off or hold "automatically" in the closed state of the at least one valve due to the pressure difference at the counter device.

It is advantageous if the counter device and the closing body are designed to be adapted to one another in such a way that when the at least one valve passes from the closed position to the open position, the closing body moves in the direction of the at least one filter.

Alternatively, it is possible that the counter device and the closing body are adapted to one another in such a way that when the at least one valve passes from the closed position to the open position, the closing body moves away from the at least one filter.

In one embodiment, the counter device has a first wall as a counter surface for the first contact area and has a second wall spaced apart in the height direction as a counter surface for the second contact area. The filter cleaning device can thus be made compact.

In particular, an opening on the mating device is arranged between the first wall and the second wall, which is in fluidic connection with a normal pressure range, in particular a normal for an opening of the opening is oriented transversely to the height direction. In this way, when the closing body is lifted off the counter device, at least one first channel and one second channel can be opened. The at least one valve can thus be opened quickly and the at least one filter can be subjected to a high volume flow of scavenging air.

It is then advantageous if the closing body with a first disc element and a spaced-apart second disc element overlaps the first wall. In this way, with a compact design of the filter cleaning device, both a first channel and a second channel, which are separate from each other, when the

Open the closing body of the counter device.

In particular, the second contact area is movable between the first wall and the second wall. In this way, an optimized supply of scavenging air (external air coupling) to the at least one filter can be achieved.

In one embodiment, a first space is formed between the second wall and the first wall, in which a second disk element of the closing body is movable, and a second space is formed between the first wall and a further wall, in which a first disk element of the closing body is movable is. This results in an optimized air supply to the at least one filter during a cleaning process.

Alternatively, it is possible for the first contact area to be movable between the first wall and the second wall.

It is then provided in particular that a first space is formed between the second wall and a further wall, in which a second disk element of the closing body is movable, and a second space is formed between the first wall and the second wall, in which a first Disc element of the closing body is movable.

In one embodiment, the filter cleaning device has a magnetic device. Depending on the design of the filter cleaning device, the closing body can be driven in its movement from the closed position into the open position via the magnet device, or the closing body can be held in the closed position of the at least one valve.

In one embodiment, the magnet device has a switchable lifting magnet and an armature is connected to the closing body, wherein the movement of the closing body can be driven by coupling the armature to the lifting magnet. The lifting magnet works together with the armature. The armature and thus the closing body can be moved by energizing the lifting magnet. In this way, in particular, a lifting movement of the closing body can be carried out; as a result, the at least one valve in particular can be transferred from the closed position to the open position.

In an alternative embodiment, the magnet device comprises a switchable holding magnet, a counter-element for the holding magnet being connected to the closing body. In particular, the closed position of the at least one valve can be held via the holding magnet. If the holding magnet is energized accordingly, this holding position is canceled, and the closing body can stand out from the Gegeneinrich device.

In one embodiment, a spring device is provided, the spring force strives to bring the at least one valve from the open position into the closed position. In particular, an automatic return from the open position to the closed position can thereby be achieved.

In one embodiment, a manual actuating element is provided which is connected to the closing body and is used for manual actuation of a cleaning process. Manual cleaning can thus be carried out.

In one embodiment, an elastic energy storage device is assigned to the at least one valve and / or an actuating element. In this context, reference is made to EP 2 451 332 B1. In this way, in particular, rapid opening of the at least one valve can be achieved. It is favorable if pressure-effective areas for the first contact area and the second contact area are different. Due to pressure differences in a normal pressure area and a negative pressure area, depending on the design of the closing body, the closing body can be automatically held in the closed position without an additional external force being necessary, or the closing body can be lifted off the counter device without an additional external force is necessary.

In one embodiment, the pressure-effective surfaces are designed to be adapted to one another in such a way that when the suction device is in operation, the at least one valve is in the closed position due to a pressure difference on the pressure-effective surfaces. Due to a pressure difference between a normal pressure area and a negative pressure area, the closing body is then pressed against the counter device. An external force is required to lift the closing body from the counter device.

It is then provided in particular that the pressure-effective surfaces are designed to be adapted in such a way that a force exerted on the closing body is required for the transition from the closed position to the open position. This can be done, for example, using a lifting magnet.

In an alternative embodiment, the pressure-effective surfaces are designed to be adapted to one another in such a way that an external holding force is necessary to hold the at least one valve in the closed position when the suction device is in operation. No external force is then necessary to lift the closing body from the counter-device. The external holding force is provided, for example, by a holding magnet.

In particular, when the holding force ceases, a pressure difference brings the at least one valve from the closed position to the open position, this transition then taking place automatically when the holding force ceases. It is particularly advantageous if a battery device is provided for battery operation of the suction device. The battery device is in particular rechargeable. In particular, battery operation is provided for both the suction unit and the filter cleaning device. The filter cleaning device according to the invention can be operated in an effective manner with optimized filter cleaning, even if the suction power is reduced, as can be the case with suction devices with battery operation.

According to the invention, a method for cleaning a filter is provided in which, by lifting a closing body of a valve from a counter device, the filter is acted upon with an air cleaning flow, with scavenging air flowing laterally past the closing body and through the closing body in an open position of the valve to which at least one filter flows, and / or wherein flushing air is coupled in in the open position of the valve in a plurality of areas spaced apart in a height direction.

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

In particular, the valve can be opened quickly and the filter can be provided with a high volume flow of scavenging air for cleaning within a relatively short time.

The inventive method can be carried out on the inventive suction device or the inventive suction device can be operated with the inventive method with regard to cleaning.

In particular, it is advantageous if, in a closed position of the valve, the closing body has a first contact area and a second contact area spaced apart in a height direction on the counter device is applied, and in the open position of the valve, scavenging air flows past both the first contact area and the second contact area to the filter. This allows the valve to open quickly. A large volume flow of external air (flushing air) for cleaning the filter can be made available to the filter within a short period of time and a cleaning flow can then be applied to the filter accordingly.

Further advantageous embodiments of the method according to the invention were already explained in connection with the suction device according to the invention.

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

Figure 1 is a schematic representation of an embodiment of a

Suction device in the form of a stand-alone vacuum cleaner;

Figure 2 is a schematic sectional view of a first embodiment

Approximate example of a filter cleaning device according to the invention in a closed position of a valve;

FIG. 3 shows the filter cleaning device according to FIG. 2 in one

open position of the valve;

FIG. 4 schematically shows a time curve of a volume of flushing air over a filter in the filter cleaning device according to FIG. 2 and, in comparison thereto, in broken lines, a curve in a filter cleaning device known from the prior art; FIG. 5 shows a schematic sectional illustration of a second exemplary embodiment of a filter cleaning device according to the invention with the valve closed;

Figure 6 shows the filter cleaning device according to Figure 5 with the open

Valve;

Figure 7 is a schematic sectional view of a third embodiment of a filter Abreinigungseinrich device according to the invention with the valve closed;

FIG. 8 the filter cleaning device according to FIG. 7 with the open

Valve;

FIG. 9 shows a schematic sectional view of a fourth exemplary embodiment of a filter Abreinigungseinrich device according to the invention with the valve closed;

Figure 10 shows the filter cleaning device according to Figure 9 with the open

Valve;

FIG. 11 shows a schematic sectional view of a fifth exemplary embodiment of a filter cleaning device according to the invention with the valve open;

Figure 12 is a schematic sectional view of a sixth embodiment of a filter Abreinigungseinrich device according to the invention with the valve closed; and

FIG. 13 shows the filter cleaning device according to FIG. 12 with the open

Valve. One embodiment of a suction device according to the invention is a vacuum cleaner 10 (FIG. 1) in the form of a stand-alone device.

The vacuum cleaner 10 comprises a suction material container 12. A receiving space for suction material is formed in the suction material container 12.

In particular, a suction head 14 is removably seated on the suction material container 12. A suction unit 16 is arranged on the suction head 14. In one embodiment, the suction unit 16 comprises a suction fan and a motor, and in particular an electric motor, which drives one or more running wheels of the suction fan in rotation.

The suction unit 16 generates a suction current during operation of the vacuum cleaner 10. The suction flow acts on the suction material container 12.

A connection 18 for a suction hose or a suction pipe 20 is arranged on the suction material container 12.

It is also possible that the connection 18 is arranged on the suction head 14 and the connection 18 is then fluidly connected to the suction material container 12.

The suction hose 20 can be subjected to the suction flow. Suction material can be sucked into the suction material container 12 through it.

The vacuum cleaner 10 has (at least) one filter 22. The filter 22 is arranged between the suction material container 12 and the suction unit 16. It has a dirt side 24, which faces the suction material container 12, and has a clean side 26, which faces the suction unit 16. The filter 22 serves to hold back dirt particles so that they cannot reach the suction unit 16.

The filter 22 is a flat pleated filter in one embodiment. It is also possible that the filter is a cartridge filter, candle filter, bag filter, etc.

It is also possible for the vacuum cleaner 10 to have several filters and, in particular, to have filters with different filter effects. In this context, reference is made to WO 2019/011429 A1 by way of example.

The vacuum cleaner 10 comprises a filter cleaning device 28. Im

Operation of the vacuum cleaner 10, dirt particles can collect on the filter 22 and "clog" it. This worsens the suction power of the vacuum cleaner 10. The filter 22 can be cleaned by the filter cleaning device 28. The cleaning takes place in particular from the clean side 26 of the filter 22. The filter cleaning device 28 allows dirt particles to be detached from the filter 22 and fed into the suction material container 12.

The filter cleaning device 28 is designed in particular in such a way that it acts on the filter 22 with scavenging air (external air) and that this leads to the loosening of dirt particles from the filter 22.

In one embodiment it is provided that the filter cleaning device 28 is demand-controlled. A control device 30 is provided for this purpose. For example, it is determined by one or more pressure sensors when a filter cleaning is necessary, and a filter cleaning is then carried out automatically via the control device 30 if the detection result is appropriate. In this context, reference is made to WO 2015/139751 A1 by way of example.

It is also possible that the control device 30 indicates the need for filter cleaning and this then has to be carried out manually by an operator. In one embodiment, vacuum cleaner 10 is battery-powered

device 32 and in particular a rechargeable battery device 32 operated. It is provided in particular that the battery device 32 provides the necessary electrical energy for the suction unit 16 and also provides the necessary electrical energy for the filter cleaning device 28.

In one embodiment, the filter cleaning device 28 is arranged above the filter 22 on the suction head 14. In principle, it is also possible for the filter cleaning device 28 to be arranged on the suction material container 12.

In a first exemplary embodiment of a filter cleaning device, which is shown in FIGS. 2 and 3 and denoted there by 34, it is provided, for example, that the filter 22 protrudes into the suction material container 12.

The filter cleaning device 34 comprises a negative pressure chamber 36 which is in fluid communication with the suction unit 16

(Figure 2).

The suction unit 16 generates a negative pressure in the area of the vacuum cleaner 10, which is present in the negative pressure chamber 36 (indicated in FIG. 2 by the pressure pi).

The filter 22 is arranged between the vacuum chamber 36 and the suction material container 12. When the vacuum cleaner 10 is in operation, there is also a negative pressure in the suction material container 12, which approximately corresponds to pi (and as a rule, due to the filter 22, is greater in amount than pi).

The vacuum cleaner 10 has an opening 38 in the vacuum chamber 36 to the filter 22. The filter 22 and thereby the suction material container 12 are connected to the suction flow via the opening 38 (in FIG. 2 by the reference number 40 indicated) acted upon. The filter 22 can also be acted upon through the opening 38 (as will be explained later) with a purge air cleaning stream from the filter cleaning device 34.

The filter cleaning device 34 comprises a valve 42 with a closing body 44.

In one embodiment, the closing body 44 is arranged on a spindle 46 in a fixed manner. The spindle 46 is displaceable in a height direction 48. As a result, the closing body 44 is also linearly displaceable in this height direction 48.

The filter 22 has an envelope 27 on the clean side 26 (FIG. 2), which is in particular an envelope plane. The height direction 48 is transverse and in particular perpendicular to this envelope 27.

The spindle 46 is guided in a linearly displaceable manner on a first guide device 50. The first guide device 50 is fixed in relation to the vacuum chamber 36.

It is further provided that the closing body is displaceably guided on a second guide device 52 and, for example, is slidably displaceable. The second guide device is also non-displaceable with respect to the vacuum chamber 36.

In one embodiment, the first guide device 50 is arranged centrally. The second guide device 52 is arranged peripherally.

The closing body has a first disk element 54. It also has a second disk element 56, which is at a distance from the first disk element 54 in the height direction 48. A connecting area 58 is positioned between the first disk element 54 and the second disk element 56. The closing body 44 is in particular rotationally symmetrical to an axis of symmetry 60 which is parallel to the height direction 48. The axis of symmetry 60 is in particular a central axis, the first guide device 50 lying on this central axis.

In one embodiment, the first disc member 54 and the second disc member 56 each have a circular perimeter.

In one embodiment, the closing body 44 is designed in two parts. It is made of two parts that are connected to each other. The first disk element 54 and part of the connecting region 58 are formed on one part, and the second disk element 56 and part of the connecting region 58 are formed on the second part.

The first disc element 54 has a front end 62. The second disc element 56 has a front end 64. As mentioned above, the first disc element 54 and the second disc element 56 are circular at their respective front ends 62 and 64, respectively.

The first disk element 54 faces the filter 22. The second disc element 56 faces away from the filter 22. The first disk element 54 is thus seated between the filter 22 and the second disk element 56.

The connection area 58 has an outer contour 66 which is set back with respect to the front ends 62, 64. As a result, a space 68 is formed laterally on the closing body 44 between the first disk element 54, the connecting region 58 and the second disk element 56.

This space 68 is in particular annular or surrounds the connecting area 58 in an annular manner. The space 68 protrudes upward through the second disk element 56, and protrudes downward (toward the filter 22) through the first disk element 54.

A first contact area 70 is arranged or formed on the first disk element 54. A second contact area 72 is arranged or formed on the second disk element 56.

The first contact area 70 is arranged on the first disk element 54 so as to be repellent to the filter 22. The second contact area 72 is arranged on the second disk element 56 so as to be repellent from the filter 22.

The filter cleaning device 34 comprises a counter device 74 for the closing body 44. The counter device 74 is arranged on the vacuum chamber 36.

The counter device 74 is formed by a housing 76.

The counter device 74 forms a valve seat or closing body seat.

The closing body 44 is movably arranged in the housing 76.

The counter device 74 comprises a first wall 78. The first wall 78 protrudes into the space 68 around the connecting area 58 of the closing body 44. The first wall 78 is arranged in a stationary manner. The first disk element 54 and the second disk element 56 are movable relative to the first wall 78.

A first opposing contact area 80 for the first contact area 70 on the closing body 44 is formed on the first wall 78.

A first sealing device 82 is assigned to the first contact area 70 and the first counter-contact area 80. The first sealing device 82 is in particular in the form of a ring, which is in particular symmetrical to the axis of symmetry 60.

In one embodiment, the first sealing device 82 is arranged on the closing body 44. Alternatively, it is possible for the corresponding sealing device to be positioned on the counter-device 74 and thereby on the first wall 78. Furthermore, it is possible for a sealing device to be arranged both on the counter device 74 and on the first disk element 54 of the closing body 44.

The first sealing device 82 is used for fluid sealing when the closing body 44 is placed against the counter device 74 on the first counter contact region 80 via the first contact area 70.

The counter device 74 further comprises a second wall 84. The second wall 84 is spaced in the height direction 48 from the first wall 78 and is further away from the filter 22 than the first wall 78; the first wall 78 lies between the second wall 84 and the filter 22 in relation to the height direction 48.

A second counter-contact area 86 for the second contact area 72 on the second disc element 56 of the closing body 44 is arranged or formed on the second wall 84.

A second sealing device 88 is assigned to the second contact area 72 and the second counter-contact area 86. This is in particular in the form of a sealing ring.

The second sealing device 88 is seated on the second disk element 56 (see FIG. 2) or on the counter device 74. It is also possible for the second sealing device 88 to have parts which are seated both on the counter device 74 and on the closing body 44. The counter-device 74 and the closing body 44 are adapted to one another so that when the closing body 44 contacts the first contact area 70 with the counter-device 74 (on the first counter-contact area 80) and fluid-tightness is achieved there, the second also Contact area 72 makes contact with the second counter-contact area 86 and fluid-tightness is also achieved there (FIG. 2).

When the first contact area 70 and the second contact area 72 of the

Closing body 44 rest against the counter device 74, then the valve 72 is in a closed position 90 (FIG. 2).

In operation 10, the vacuum cleaner has a negative pressure area 92. The negative pressure area 92 is that area which is acted upon by a suction flow. The filter 22 lies against this negative pressure region 92. An interior of the negative pressure chamber 36 lies against the negative pressure region 92.

When the suction unit 16 generates a suction flow, there is a negative pressure in the negative pressure region 92 in relation to an outside space and in particular in relation to atmospheric pressure. The negative pressure can be different at different points of the negative pressure region 92.

The vacuum cleaner 10 also has a normal pressure area 94. The normal pressure area 94 surrounds the vacuum chamber 36 and surrounds the filter cleaning device 34. The valve 42 serves, when it is in the closed position 90, to separate the normal pressure area 94 from the vacuum area 92 in a fluid-tight manner. In a “normal” suction operation, a fluid-tight separation of the normal pressure area 94 from the negative pressure area 92 prevents leakage currents.

To provide flushing air for filter cleaning of the filter 22 by the filter cleaning device 34, a fluid-active connection between the normal pressure area 94 and the negative pressure area 92 is provided. In the normal pressure area 94 there is a pressure p2 which is greater than the pressure pi in the negative pressure area. In one embodiment, the pressure p2 is approximately constant and is at the external atmospheric pressure.

It is also possible for the pressure p2 in the normal pressure range 94 to be greater than the atmospheric pressure. For example, it is provided in one embodiment that a compressor acts on the normal pressure region 94 and a pressure p2 then prevails there which is above atmospheric pressure. Such an embodiment is used, for example, in a sweeper.

The closing body 44 has on the first disk element 54 and the second disk element 56 effective surfaces for the application of pressure.

In one embodiment (compare Figures 2 and 3), the closing body 44 is formed on the first disc element 54 and the second disc element 56 with respect to the pressure-effective surfaces in such a way that the closing body 44 in the closed position 90 due to the pressure difference between the normal pressure area 94 and the vacuum region 92 is maintained in the closed position 90. For this purpose, the second disk element 56 has a larger diameter than the first disk element 54. The front end 64 of the second disk element 56 is spaced further apart from the axis of symmetry 60 than the front end 62 of the first disk element 54; the front end 62 is set back by a distance D compared to the front end 64 (compare the reference symbol 96 in FIG. 2).

For example, the effective diameter of the second disk element 56 for a seal is greater than the effective diameter of the first disk element 54 by a factor greater than one to approximately 1.3. This difference in the design of the first disk element 54 and the second disk element 56 has the effect that the force due to the pressure difference between the normal pressure area 94 and the negative pressure area 92 presses the closing body 44 against the counter device 74.

The housing 76 of the counter device 74 has an opening or has a plurality of openings 98 through which air (from the normal pressure area 94) can flow into the housing 76.

In particular, an opening 98 has an opening normal which is transverse and in particular perpendicular to the height direction 48. In FIG. 2, this orifice normal is indicated with the reference symbol 100.

Starting from the opening or openings 98, the housing 76 has a space 101 in which the closing body 44 is movable. This space 101 is connected to a corresponding space of the negative pressure chamber 36 and is thereby also connected to the filter 22.

The filter cleaning device 34 has a magnetic device 102. This includes an (electro) magnet 104, which is controlled by the control device 30.

The magnet 104 is positioned centrally and in particular coaxially to the axis of symmetry 50 so as to be non-displaceable with respect to the vacuum chamber 36.

An anchor 106 is seated on the spindle 46. The anchor 106 is likewise positioned on the central axis 60.

The armature 106 cooperates with the magnet 104.

In the closed position 90 of the valve 42, the force caused by the pressure difference ensures that the closing body 44 rests against the counter device 74. The magnet 104 is designed as a lifting magnet. The armature 106 is, for example, a movable iron core.

By energizing the magnet 104, it exerts a force on the armature 106 and thus the closing body 44. The closing body 44 can stand out from the counter device 74 (FIG. 3). The valve 42 is opened; the valve 42 is in an open position 108.

It is fundamentally possible that the valve 42 can take different positions in the open position 108 in relation to the height direction 48.

A maximum stroke of the closing body 44 starting from the closed position 90 is predetermined by a stop 110 on the first guide device 50 (or alternatively or additionally by a stop on the second guide device 52).

Starting from the closed position 90, when the valve 42 opens, the closing body 44 moves in a direction 112 (see FIG. 2) towards the at least one filter 22.

To reach the closed position 90, the closing body 44 moves from the open position 108 in a direction 114 (see FIG. 3), which is the opposite direction to the direction 112 and which is away from the filter 22.

By appropriately activating (energizing) the (electro) magnet 104, the closing body 44 can be lifted off the counter device 74 in a controlled manner in order to generate a purge air cleaning stream in a controlled manner.

In particular, the closing body 44 is supported abge via a spring device 116. The spring device 116 is arranged so that it strives to have a To exert a force which acts as a restoring force and which acts in the direction 114. In particular, the spring device 116 is compressed when the closing body 44 is brought from the closed position 90 into the open position 108. This requires an external force which is exerted on the armature 106 via the magnet 104. If this force, which outweighs the corresponding force of the spring device 116, is no longer available, the spring device 116 (in addition to the existing pressure difference) brings the closing body 44 again into the closed position 90 by moving it in the direction 114. The force of the Federeinrich device 116 thus acts in the direction 114.

In one embodiment, the counter device 74 has a central opening 118 around the axis of symmetry 60. The magnet 104 is positioned above this opening 118. The anchor 106 is positioned at least partially in the opening 118.

A sealing sleeve 120 is positioned between the armature 106 or the spindle 46 and the magnet 104, which enables the armature 106 to move (around a transition between the closed position 90 and the open position 108 and vice versa between the open position 108 and the closed position) To enable position 90, and to obtain a fluid-tight seal of the space 101 with respect to the magnet 104.

The filter cleaning device 28 comprises (at least) a first channel 122 and a second channel 124, which is separate from the first channel 122, for scavenging air.

The first channel 122 comprises a first region 126 (compare FIG. 3) which is oriented transversely to the height direction 48. Scavenging air which flows in the first region 126 has a main flow direction which is oriented at least approximately transversely to the height direction 28. The The first area 126 starts from the opening 98 in the housing 76. The first area 126 has an annular shape.

The first region 126 is formed between an upper side of the closing body 44 and thereby between the second disk element 56 and the second wall 84.

A deflection area 128 adjoins the first area 126. This deflection area 128 is used to deflect the flow. A second area 130 of the first channel 122 adjoins the deflection area 128. This second region 130 of the first channel 122 is passed through the closing body 44 and thereby through the first disk element 54, the connecting region 58 and the second disk element 56 and it opens into the vacuum chamber 36.

A main flow direction in the second region 130 of the first channel 122 is at least approximately parallel to the height direction 48.

The second area 130 is at least partially delimited by the second wall 84, the second wall 84 being in particular arcuate and having an area which is at least approximately parallel to the height direction 48.

In the closed position 90 of the valve 42, the first channel 122 is closed on the inlet side to the normal pressure region 94. The first area 126 is closed with respect to the normal pressure area 94 (compare FIG. 2). It is sealed in a fluid-tight manner, so that in the closed position 90 of the valve, due to the contact of the second contact area 72 against the second counter-contact area 86, no air can flow into the first channel 122 on the inlet side, starting from a normal pressure area 94. The first channel 122 with its second area 130 is permanently connected to the vacuum chamber 36 with fluid action, that is to say it is permanently connected to the vacuum chamber 36 on the outlet side.

The second channel 124 has a first region 132 (compare FIGS. 2 and 3) which is oriented transversely to the height direction 48. When scavenging air flows in the first region 132 of the second channel 124, a main flow direction in the first region is transverse to the vertical direction 48.

The first region 132 forms an entrance to the second channel 124. The second channel 124 is continuously connected on the inlet side to the normal pressure area 94 (compare FIGS. 2 and 3) via the first area 132.

The first region 132 of the second channel 124 is formed between the first wall 78 and the second disk element 56.

A deflection area 134 adjoins the first area 132. This deflection area 134 comprises a second area in which at least approximately one main flow direction is parallel to the height direction 48.

The deflection area 134 is followed by a further first area 136, which is also oriented transversely to the height direction 48. The further first area 136 is followed by a further second area 138 which is oriented at least approximately parallel to the height direction 48. In the further, second region 138, a main flow direction is at least approximately parallel to the height direction 48. The further second region 138 of the second channel 124 opens into the vacuum chamber 36.

The second channel 124 opens on the inlet side into the normal pressure region 94 and on the outlet side into the negative pressure chamber 36 and thereby into the negative pressure region 92. The second channel 124 is permanently connected to the normal pressure area 94 via the first area 132, that is, it is connected to the normal pressure area 94 both in the closed position 90 of the valve 42 and in the open position 108 of the valve 42 (compare FIGS 3).

The second channel 124 is connected to the negative pressure region 92 (and at the same time the negative pressure chamber 36) in a fluidically effective manner via its further second region 138 on the output side only in the open position 108 of the valve 42. In the closed position 90, the second channel 124 is closed in a fluid-tight manner with respect to the negative pressure area 92 by the contact of the first contact area 70 with the first counter contact area 80.

The first channel 122 and the second channel 124 are annular. In particular, the first channel 122 or the second channel 124 is annular in each cross section to the vertical direction 48.

With the first channel 122 in the open position 108 of the valve 42, scavenging air can be supplied in a first partial flow 140 (see FIG. 3) through the closing body 44 and through an opening 142 in the closing body through the filter 22.

Through the second channel 124, a second partial flow 144 of scavenging air can be guided laterally past the closing body 44 and outside the connection area 58 along the outer contour 66 and guided to the filter 22.

A first space 85 is formed between the second wall 84 and the first wall 78. The second disk element 56 of the closing body 44 is movable in this first space 85. There is a further wall 87 which lies between the first wall 78 and the filter 22. The further wall 87 can also be part of the vacuum chamber 36. A second space 89 is located between the first wall 78 and the further wall 87 educated. In this second space 89, the first disc element 54 is movable.

The filter cleaning device 34 functions as follows:

In a suction mode of the vacuum cleaner 10, the suction unit 16 generates a suction flow. In the negative pressure area 92 compared to the normal pressure area 94 is a negative pressure. In normal operation, the valve 42 is closed; it is in the closed position 90. The contact areas 70, 72 lie on the counter device 74. The vacuum chamber 36 is thereby closed in a fluid-tight manner with respect to the normal pressure area 94.

When a filter cleaning process is initiated, the closing body 44 is moved.

For this purpose, the magnet 104 is correspondingly charged with current (controlled by the control device 30). This leads to a movement of the armature 106 and a lifting of the closing body 44 from the counter device 74 results.

As a result, the first channel 122 is opened on the input side and the second channel 124 is opened on the output side.

Because of the pressure difference between the normal pressure area 94 and the negative pressure area 92, the first partial flow 140 and the second partial flow 144 flow. The two partial flows 140, 144 are annular.

The first partial flow 140 flows through the closing body 44. The second partial flow 144 flows around the closing body 44.

A corresponding flushing flow flows into the negative pressure chamber 36 and flows from the negative pressure chamber (through it) to the filter 22. A cleaning flow is produced which acts on the filter 22 (FIG. 3; the cleaning flow is indicated with the reference numeral 146). The filter 22 is flushed by the corresponding flushing flow. Adhering dirt particles can loosen and fall into the suction material container 12.

The filter cleaning takes place in such a way that the suction flow of the suction unit 16 is still applied to the vacuum chamber 36.

In the solution according to the invention, in the closed position 90, the seal against the normal pressure area 94 is achieved by the closing body 94 on (at least) two levels above the first contact area 70 and the second contact area 72. The first contact area 70 and the second contact area 72 are effective simultaneously in the closed position 90. The first contact area 70 and the second contact area 72 are offset in the height direction 48.

When the closing body 44 is lifted from the closed position 90, orifice openings on the first channel 122 and the second channel 124 are released, through which purge air (external air) can flow. A radial opening area increases with the valve lift.

Scavenging air then flows past the first contact area 70 and the second contact area 72 to the filter 22. Correspondingly, scavenging air also flows past the first counter contact area 80 and the second counter contact area 86 to the filter 22.

In the filter cleaning device 34, an effective sealing diameter of the closing body 44 on the first disk element 54 and the second disk element 56 is different, so that there is a different pressure effect. In this embodiment, this is dimensioned such that the closing body 44 is held in the closed position 90 without external force due to the pressure difference between the negative pressure area 92 and the normal pressure area 94. When the closing body 44 is lifted from the closed position 90, the fluid-tight seal on the first contact area 70 and the second contact area 72 is canceled approximately at the same time.

When the valve 72 is opened, a large air cross-section can be achieved for the scavenging air to flow to the filter 22. A relatively large air cross-section can quickly be achieved when opening.

In Figure 4 is shown schematically in a solid line, a time course of a volume of cleaning air over the filter 22 in the solution according to the invention. It can be seen that within a relatively short time there is a rapid increase and then a relatively high level is reached. The measurement was carried out in connection with a suction material container 20 with a holding volume of 20 l.

In comparison, the corresponding course for a conventional filter cleaning device is shown in broken lines, as is described in DE 10 2010 029 518 A1.

In the solution according to the invention with the course 148, the faster rise and the higher plateau 152 can be seen in comparison to the course 150.

The steeper course 158 is due to a faster opening of the valve 42. A higher level 152 means a larger amount of purge air (external air as cleaning air).

In the solution according to the invention, when the valve 42 is opened, an annular gap opening is achieved at different levels and with a large diameter by the height-offset system areas 70, 72. As he mentioned, the opening cross-section increases with the valve lift. For example opens a pulse of the order of 90 ms on the magnet 104 (lifting magnets) the valve 42.

It is fundamentally possible for an additional energy storage spring 154 (see FIG. 3) to be provided, which is arranged, for example, on the first guide device 50 and which serves to increase the opening speed. A force of the energy storage spring 154 strives to lift the closing body 44 from the counter device 74.

The energy storage spring 154 must be dimensioned accordingly, taking into account the spring device 116 and the pressure force which holds the closing body 44 on the counter device 74 in the closed position 90.

It has been shown that with the filter cleaning device 34 according to the invention there is a relatively low level of noise development with regard to popping noises. In comparison with a filter cleaning device, as is described in DE 10 2010 029 518 A1, there has been a reduction in popping noises by approximately 3.6 dB (A) or more.

Effective filter cleaning can be achieved with the filter cleaning device 34 even if the suction fan is of a weaker design, such as, for example, in the case of a vacuum cleaner 10 which is operated with a battery device 32.

In one embodiment it is provided that the magnet 104 is activated periodically. For example, three consecutive opening pulses with a duration of approx. 90 ms or 100 ms are given every 15 s.

In one embodiment it is provided that the first contact area 70 on the first disk element 54 has a diameter of approximately 115 mm. The second contact area 72 on the second disk element 56 has a diameter of approximately 120 mm. A stroke of the valve 42 and thus a stroke of the closing body 44 in the vertical direction 48 starting from the closed position 90 is in particular at least 5 mm. The stroke is preferably at most 50 mm.

In a specific embodiment, the valve lift is in the range between 10 mm and 20 mm.

It is provided that the distance between the first contact area 70 and the second contact area 72 in the height direction 48 is at least 6 mm and preferably at least 10 mm. In a specific embodiment, this axial distance is 30 mm.

A diameter at the second contact area 72 is preferably at least 50 mm. The seal diameter at the first contact area 70 is a maximum of 200 mm.

Another exemplary embodiment of a filter cleaning device, which is shown in FIGS. 5 (with closed valve) and 6 (with open valve) and is denoted by 156, comprises a closing body 158 with a first disk element 160, a second disk element 162 and a connecting area 164 between the first disk element 160 and the second disk element 162. As with the closing body 44, a first contact area is arranged on the first disk element 160 and a second contact area is arranged on the second disk element 162.

The closing body 158 differs from the closing body 44 in that an effective pressure area on the first disc element 160 is larger than on the second disc element 162; With regard to the first contact area, the first disk element 160 has a larger diameter than the second disk element 162. For example, the effective diameter of the second disk element 162 is smaller by a factor of up to 0.7 than the effective diameter of the first disk element 160.

The counter-device is basically of the same design as the counter-device 74. The same reference number is therefore used.

As a result, in a closed position 165 (FIG. 5) of a corresponding valve 166 with the closing body 158, when the contact areas of the closing body 158 lie on the counter device 74, a force acts on the closing body 158, which strives to move it in the direction of the filter 22 to move. The corresponding direction of action is indicated in FIG. 2 by the arrows with the reference number 168.

In order to hold the valve 166 in the closed position 165, a holding device 170 is necessary. The holding device 170 is designed as a magnetic device 172. This magnetic device 172 has a holding magnet 174, which is in particular an electromagnet. The holding magnet 174 is firmly connected to a vacuum chamber 36. The closing body 158 is displaceable with respect to the holding magnet 174.

The holding magnet 174 is controlled in particular by the control device 30.

The valve 166 has a spindle 176 on which a magnetic holding plate 178 is seated. In the closed position 156 of the valve 166, the holding magnet 174 is energized in such a way that it exerts a magnetic force on the holding plate 178 and thus the spindle 176 with the closing body 158. The closed position 165 of the valve 166 is thereby fixed.

To open the valve 166 and transition to an open position 180 (FIG. 6), the application of current to the holding magnet 174 is changed in such a way that the magnetic force of the holding magnet 174 is no longer sufficient To hold the closing body 158 with the holding plate 178 in the closed position 165. Because of the pressure difference between the negative pressure area 92 and the normal pressure area 94, the valve 166 opens and the contact area of the closing body 158 is lifted from the counter device 74. Purge air can then reach the filter 22 as described above with reference to the filter cleaning device 34.

In this regard, the filter cleaning device 156 functions in the same way as the filter cleaning device 34.

The filter cleaning device 156 can be viewed as a type of kinematic reversal of the filter cleaning device 34. In the filter cleaning device 34, the pressure difference between the negative pressure area 92 and the normal pressure area 94 holds the closing body 44 in the closed position 90.

In the case of the filter cleaning device 156, due to the corresponding design of the closing body 158, a holding force is necessary to prevent the

To hold the closing body 158 on the counter device 74 in the closed position 165.

In the filter cleaning device 34, to reach the open position 108 of the valve 42, the magnet device 102 with the lifting magnet 104 exerts a corresponding force on the closing body 44 in order to move it in the direction of the filter 22 and thereby to reach the open position 108.

In the case of the filter cleaning device 156, when the holding force is eliminated (or reduced) by the holding magnet 174, the closing body 158 is moved into the open position 108 in the direction of the filter 22 due to the pressure difference. In principle, it is also possible that the holding magnet 174 is designed in cooperation with the holding plate 178 so that it holds the closed position 165 in a de-energized state and the holding force is reduced when current is applied to move the valve 166 out of the closed position 165 to move out.

In the case of the filter cleaning device 156, in the closed position 165, the closing body 158 also abuts the counter device 74 on at least two levels.

When the valve 166 is opened, a similar or the same flow pattern as in the filter cleaning device 34 with the advantages explained there is basically formed.

The filter cleaning device 156 comprises in particular a spring device 181, which acts as a return spring device and strives to move the valve 166 from the open position 180 into the closed position 165.

A further embodiment of a filter cleaning device 182 according to the invention, which is shown schematically in FIG. 7 (in the closed position of a valve) and FIG. 8 (in an open position of the valve), comprises a counter device 184 with a housing 186.

A closing body 188 is displaceably guided in the housing 186. The closing body 188 comprises a first disk element 190 with a first contact area 192. It further comprises a second disk element 194 with a second contact area 196. A connecting area 198 is positioned between the first disk element 190 and the second disk element 194. The counter device 184 has a first wall 200. This has a first opposing contact area for the first contact area 192. The counter device also has a second wall 202, which has a counter contact area for the second contact area 196.

The first wall 200 and the second wall 202 are spaced apart from one another in a height direction 204. The first contact area 192 and the second contact area 196 on the closing body 188 are also spaced apart from one another in the height direction 204, as in the case of the filter cleaning device 34 or 156.

The housing 166 has a third wall 206. A space 208 is formed between the third wall 206 and the second wall 202.

A first space 207 is formed between the second wall 202 and the third wall 206 as a further wall. The second disk element 194 is movable in this first space 207.

A second space 209 is formed between the first wall 200 and the second wall 202. The first disk element 190 is movable in this.

A valve 210 with the closing body 188 is displaceable with respect to the counter device 184. Starting from a closed position 212 of the valve 210 (FIG. 7), in which the closing body 188 with its contact areas 192, 196 is in contact with the counter device 184, the closing body 188 is movable in a direction 214 away from the valve 22.

The filter cleaning device 182 has a first channel 216 and a second channel 218.

In the closed position 212 of the valve 210 (FIG. 7), the first channel 216 and the second channel 218 are closed in a fluid-tight manner with respect to a normal pressure region 94. During a valve stroke (FIG. 8) in which the valve 210 is in an open position 220, the first channel 216 and the second channel 218 are open on the inlet side to the normal pressure region 94.

Purge air can then flow in and flow to the filter 22 (the filter is not shown in FIGS. 7, 8; its location is indicated by the reference number 22).

The first channel 216 has a first area 222 at which an entrance is located. In the open position 220, air can flow in via this. A partial flow of air flows past an outer contour of the closing body 188 and flows in the housing 186 between an upper side of the closing body 188 and the third wall 206. The partial flow is deflected and then flows through the closing body 188 to the filter 22.

A further partial flow 224 flows in via a first region of the second channel 218 and is deflected towards the filter 22.

In one embodiment, the first disk element 190 has a larger diameter in relation to the first contact area 192 than the second disk element 194 in relation to a second contact area 196.

This means that due to the pressure difference between the normal pressure area 94 and a negative pressure area 92, the closing body 188 is pressed against the counter device 184 and the closed position 212 is secured.

External force is required to move the valve 210 out of the closed position 212.

For this purpose, a magnetic device corresponding to the magnetic device 102 is seen before (the same reference symbols are used for the same elements). This includes a lifting magnet 104, which acts on a corresponding armature 106.

The first abutment area 192 and the second abutment area 196 on the

Closing bodies 188 face the filter 22, that is to say point in a direction in the opposite direction to the direction 214.

In the case of the filter cleaning device 182, a transition from the closed position 12 to the open position 220 takes place by a movement of the closing body 188 away from the filter 22 and thus, as it were, upwards.

In the case of the filter cleaning devices 34 and 156, the corresponding valve 42 or 166 is opened due to a movement of the respective closing body 44 or 158 towards the filter 22.

A further exemplary embodiment of a filter cleaning device, which is shown in FIGS. 9 and 10 and designated by 226, a closed position of a valve 228 being shown in FIG. 9 and an open position of the valve 228 being shown in FIG Closing body 230. A counter-device is provided which is basically constructed in the same way as counter-device 184. The same reference numerals are used for the same elements as in the filter cleaning device 182.

The closing body 230 is designed such that it has a larger effective pressure diameter with respect to a second contact area 232 than for a first contact area 234.

The pressure difference between a normal pressure area 94 and a negative pressure area 92 causes the closing body to move away from its contact with the counter-device 184. In order to hold the closed position according to FIG. 9, a holding force is therefore necessary. For example, a magnetic device corresponding to the magnetic device 172 with a holding magnet 174 is used ver. The same reference symbols are used for the same elements as in the filter cleaning device 56.

In this regard, the filter cleaning device 226 functions in the same way as the filter cleaning device 156. Just as the filter cleaning device 156 represents a type of kinematic reversal of the filter cleaning device 34, the filter cleaning device 226 represents a type of kinematic reversal of the filters Cleaning device 182.

In the case of the filter cleaning devices 182 and 226, a transition from the closed position 212 to the open position 220 takes place by moving the corresponding closing body 188 or 230 away from the filter 22, so to speak upwards.

As in the case of the filter cleaning devices 34 and 156, a cleaning current can again be generated, in which a steep rise and a high level is achieved (see FIG. 4) and thereby effective cleaning is achieved.

Another embodiment of a filter cleaning device according to the invention, which is shown schematically in Figure 11 and designated 236, with an open position 238 of a valve 240 with a closing body 242 is shown, with regard to the design of the closing body and the flow guide is designed the same as the Filter cleaning device 34.

The filter cleaning device 236 is intended for manual operation. It comprises a hand actuating element 244. This hand actuating element is connected to a spindle 246. The hand actuating element 244 is connected to the closing body 242. An operator can directly access the manual actuation element 244, or a corresponding conversion mechanism is provided, via which a manual actuation by an operator is passed on to the manual actuation element 244.

The closing body 242 is displaceably guided on a counter-device 252 for the closing body 242 via a first guide device 248, which is central, and a second guide device, which is peripheral.

By pressing on the manual operating element 244 in a direction 254 towards the filter 22, the closing body 242 is lifted, in the same way as described above for the filter cleaning device 34 with reference to the closing body 44. (In the case of the filter cleaning device 34, lifting occurs due to the lifting magnet 104.)

A spring device 256 resets the closing body 242 into its closed position, from which the manual actuation element 244 is actuated.

The closing body 242 is designed like the closing body 44 in the filter cleaning device 34. As a result, a closed position of the valve 240 is ensured by the pressure difference between a normal pressure area and a negative pressure area. An external force is necessary in order to lift a contact between the closing body 242 and the counter device 252, that is to say in order to lift the valve 240 from a closed position.

In principle, it is possible that the manual actuating element 244 is designed as an actuating button and a spring device 258 is provided, which is designed in particular as an energy store. The spring device 256 mentioned above ensures that the manual actuating element 244 is reset. With regard to the flow guidance, the filter cleaning device 236 functions like the filter cleaning device 34.

In a sixth exemplary embodiment of a filter cleaning device, which is shown in FIGS. 12 and 13 and denoted there by 260, a closed position 262 being shown in FIG. 12 and an open position 264 of a valve 266 shown in FIG. 13, seated on the valve 266 a closing body 268. The closing body 268 is guided in a housing 270 of a counter device 272. It is displaceable in a height direction 274.

The closing body 268 has a first contact area 276 on a first wall 278 of the mating device 272. The first contact area 276 has a first sub-contact area 276a and a second sub-contact area 276b. The first sub-contact area 276a and the second sub-contact area 276b are spaced apart from one another in a radial direction perpendicular to the height direction 274. In particular, they are ring-shaped and concentric to one another. In particular, the first sub-contact area 276a is an outer area which, in a closed manner, surrounds the second sub-contact area 276b.

Furthermore, a second contact area 280 is formed on the closing body 268 at a distance from the first contact area 276 in the vertical direction. This has a first sub-contact area 280a and a second sub-contact area 280b.

These sub-contact areas 280a and 280b are in particular annular and concentric with one another.

The sub-contact areas 280a, 280b are radially spaced apart from one another, that is to say they are spaced apart from one another in a direction perpendicular to the height direction 264. The counter device 272 has corresponding counter contact areas.

In the closing body 268, between the first sub-contact area 276a and the second sub-contact area 276b of the first contact area 276 on one side, and the first sub-contact area 280a and the second sub-contact area 280b of the second contact area 280, there is a continuous and in particular annular opening 282 is formed. This forms parts of a channel.

The second contact area 280 is used to contact a second wall 284 of the counter device 272 in the closed position 262.

A lateral opening 286 is formed between the second wall 284 and the first wall 278.

Furthermore, an annular opening 288 is formed on the second wall 284 associated with the second sub-contact area 280b.

When the valve 296 is lifted from the open position 264 (see FIG. 13), scavenging air can flow in from a normal pressure area 94 via the opening 286 and thereby flow through the opening 282 of the closing body 268. Furthermore, purge air can flow in via the opening 286 and flow through the opening 282 of the closing body 268.

A first partial flow 290 and a second partial flow 292 are formed above the closing body 268 (see FIG. 13). A first channel 294 is formed, which has a first inlet 296 and a second inlet 298.

Furthermore, a second channel 300 is formed, which basically corresponds to the second channel 124 in the filter cleaning device 34. The first channel 294 is T-shaped in the region of the second wall 284 with a transverse region on which the first input 296 and the second input 298 are located.

The transverse area of the first channel 294 between the first inlet 296 and the second inlet 298 has a collecting area 300. The first partial flow 290 and the second partial flow 292 are brought together in this and flow through the opening 282. In particular, the collecting area 300 lies above the opening 282. Following the collecting area 300, a merging flow as a merging of the first partial flow 290 and the second partial flow 292 flows through the opening 282 in the closing body 268.

When the valve 266 opens, the first partial flow 290 can then flow radially inward, starting from the first inlet 296, and then flow through the closing body 268. The second partial flow 292, which enters through the second inlet 292, can flow radially outward and then flow through the opening 282 and thereby through the closing body 268 to the filter 22.

Otherwise, the filter cleaning device 260 functions in the same way as the filter cleaning device 34.

According to the invention, a filter cleaning device is provided which, in the closed position, has contact areas (sealing areas) on different levels.

When a corresponding valve is opened, flushing air (external air) can flow in at different levels for filter cleaning from a normal pressure area. Separate partial flows can be combined, which then act on the filter 22 for effective cleaning. This results in large radial cross-sections for an inflowing scavenging air. The corresponding closing body is both flowed through and around the scavenging air in partial flows. In this way, a volume of purge air for cleaning the filter can be achieved, which reaches a high level in terms of the amount of cleaning air within a short time. The corresponding valve can be opened quickly. A filter cleaning device according to the invention can be used in a stand-alone vacuum cleaner as described above. It can also be used, for example, in a suction device which is integrated into a vehicle such as a self-propelled floor cleaning machine (such as a sweeper 10). It can also be used in a vacuum robot, for example.

List of reference symbols

vacuum cleaner

Suction material container

Suction head

Suction unit

connection

Suction hose

filter

Dirty side

Clean side

Enveloping

Filter cleaning device

Control device

Battery device

Filter cleaning device (first embodiment)

Vacuum chamber

opening

Suction flow

Valve

Closing body

spindle

Height direction

First guide facility

Second guide device

First disc element

Second disc element

Connection area

Axis of symmetry

Front end

Outer contour room

First investment area

Second investment area

Counter device

casing

First wall

First counter-investment area

First sealing device

Second wall

First room

Second counter-investment area

Further wall

Second sealing device

Second room

Closed position

Vacuum area

Normal pressure range

distance

opening

Muzzle standards

room

Magnetic device

magnet

anchor

Open position

attack

direction

Spring device

opening

Sealing collar

First channel

Second channel First area

Diversion area

Second area

First area

Diversion area

Another first area

Another second area

First partial flow

opening

Second partial stream

Cleaning stream

course

level

Energy storage spring

Filter cleaning device (second embodiment) closing body

First disc element

Second disc element

Connection area

Closed position

Valve

direction

Holding device

Magnetic device

Holding magnet

spindle

Retaining plate

Open position

Filter cleaning device (third embodiment) Counter device

casing

Closing body First disc element

First investment area

Second disc element

Second investment area

Connection area

First wall

Second wall

Height direction

Third wall

First room

room

Second room

Valve

Closed position

direction

First channel

Second channel

Open position

First area

Another partial flow

Filter cleaning device (fourth embodiment) valve

Closing body

Second investment area

First investment area

Filter cleaning device (fifth embodiment) Open position

Valve

Closing body

Hand actuator

spindle

First guide facility

Second guide device Counter device

direction

Spring device

Filter cleaning device (sixth embodiment) Closed position

Open position

Valve

Closing body

casing

Counter device

Height direction

First investment area

a First sub-investment area

b Second sub-investment area

First wall

Second investment area

a First sub-investment area

b Second sub-investment area

opening

Second wall

Side opening

opening

First partial flow

Second partial stream

First channel

First entrance

Second entrance

Collection area

Claims

1. Suction device, comprising a suction unit (16) for generating a suction flow (40), at least one filter (22), and a filter cleaning device (28; 34; 156; 182; 226; 236; 260), wherein the Filter cleaning device (28; 34; 156; 182; 226; 236; 260) at least one valve (42; 166; 210; 228; 240; 266) with a movable one

Closing body (44; 158; 188; 230; 268) and a counter device (74; 184; 252; 272) for the closing body (44; 158; 188; 230; 268), and wherein in an open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) the at least one filter (22) is acted upon by a cleaning flow and in a closed position (90; 165; 212; 262) of the at least a valve (42; 166; 210; 228; 240; 266) the cleaning stream is or becomes inactive, characterized in that the closing body (44; 158; 188; 230; 268) has at least one first contact area (70; 192; 234 ; 276) on the counter device (74; 184; 252; 272) and a second contact area (72; 196; 232; 280) on the counter device (74; 184; 252; 272), the second contact area (72; 196 ; 232; 280) in a height direction (48; 204) at a distance from the first contact area (70; 192; 234; 276) that in the closed position (90; 165; 212; 262) of the at least one V. entils (42; 166; 210; 228; 240; 266) both the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) are in contact with the mating device (74; 184; 252; 272), and that in the open position ( 108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) both the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) at a distance from the counter device (74; 184; 252; 272), wherein in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) a flushing air flow at both the flows past the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) to the filter (22). 2. Suction device according to claim 1, characterized by a negative pressure area (92) in a suction mode, on which the at least one filter (22) is arranged, and a normal pressure area (94), on which the counter device (74; 184; 252; 272 ) is arranged, where in the closed position (90; 165; 212; 262) of the at least one valve (42; 166; 210; 228; 240; 266) the normal pressure area (94) is fluid-tightly separated from the negative pressure area (92) , and in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) the normal pressure area (94) and the negative pressure area (92) through a channel device (122, 124) are fluidically connected to each other.

3. Suction device according to claim 2, characterized in that the cleaning stream by bringing the at least one valve (42;

166; 210; 228; 240; 266) from the closed position (90; 165;

212; 262) into the open position (108; 180; 238) is or is being generated.

4. Suction device according to claim 2 or 3, characterized in that the channel device (122, 124) opens on the inlet side in the normal pressure area (94) and on the outlet side in the negative pressure area (92).

5. Suction device according to one of claims 2 to 4, characterized

shows that an inlet cross-section for air into the duct device (122, 124) increases steadily with a valve lift when the closing body (44; 158; 188; 230; 268) is lifted from the counter device (74; 184; 252; 272).

6. Suction device according to one of the preceding claims, characterized in that the cleaning flow is or is generated while the at least one filter (22) is being acted upon by the suction unit (16) with a suction flow (40). 7. Suction device according to one of the preceding claims, characterized by at least one of the following: the height direction (48; 204) is parallel to a direction of movement and in particular the direction of displacement of the closing body (44; 158; 188; 230; 268); the height direction (48; 204) is parallel to a main flow direction of a suction flow when it flows through the at least one filter (22) in suction mode; the height direction (48; 204) is parallel to a main flow direction of the cleaning stream when it flows through the at least one filter (22); the height direction (48; 204) is transverse and in particular perpendicular to an envelope surface of the at least one filter (22) on a clean side (26); the height direction (48; 204) is parallel to an axis of symmetry of the at least one valve (42; 166; 210; 228; 240; 266).

8. Suction device according to one of the preceding claims, characterized in that the counter-device (74; 184; 252; 272) has a first counter-contact area (80) for the first contact area (70; 192; 234; 276) and a second counter- Has contact area (86) for the second contact area (72; 196; 232; 280), the second counter-contact area (86) and the first counter-contact area (80) being spaced from one another in the vertical direction (48; 204). 9. Suction device according to one of the preceding claims, characterized in that the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) each have a sealing device (82; 88) in particular in the Is assigned the form of a sealing ring, and in particular characterized by at least one of the following: the sealing device (82; 88) is on the closing body (44;

158; 188; 230; 268) arranged; the sealing device is on the counter device (74; 184;

252; 272).

10. Suction device according to one of the preceding claims, characterized in that the counter-device (74; 184) has a housing (76; 186) in which the closing body (44; 188) is movably arranged, and which has a through-flow space for scavenging air .

11. Suction device according to one of the preceding claims, characterized in that a clean side (26) of the at least one filter (22) is located on a vacuum chamber (36), in particular with at least one of the following: the vacuum chamber (36) is with the suction unit (16) connected; In a suction mode of the suction device, the negative pressure chamber (36) is permanently fluidly connected to the suction unit (16); at least one channel (122; 124) of the filter cleaning device (34) opens into the vacuum chamber (36) for air supply to the at least one filter (22) in a cleaning operation; the counter device (74) is arranged on the vacuum chamber (36); the at least one valve (42) separates the vacuum chamber (36) in a closed position (90) of the at least one valve (42) in a fluid-tight manner from a normal pressure area (94).

12. Suction device according to one of the preceding claims, characterized in that the at least one valve (42; 166; 210; 228; 240; 266) and / or the closing body (44; 158; 188; 230; 268) rotationally symmetrical to a Is formed axis of symmetry, in particular the axis of symmetry is parallel to the height direction (48; 204). 13. Suction device according to the preamble of claim 1 or one of the preceding claims, characterized in that the closing body (44; 158; 188; 230; 268) and the counter device (74; 184; 252; 272) are adapted to one another so that that in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) a plurality of separate air partial flows (140; 144) on the filter cleaning device (28; 34; 156; 182; 226; 236; 260) flows, and in particular a first partial flow (140) past the closing body (44; 158; 188; 230; 268) on the outside and a second partial flow (144) through the closing body (44; 158; 188; 230; 268) through to which at least one filter (22) flows.

14. Suction device according to the preamble of claim 1 or one of the preceding claims, characterized in that the filter cleaning device (28; 34; 156; 182; 226; 236; 260) in the open position (108; 180; 238 ) the at least one valve (42; 166; 210; 228; 240; 266) has at least one first channel (122) for a first partial flow (140) and a second channel (124) for a second partial flow (144), the second channel (124) is separate from the first channel (122).

15. Suction device according to claim 14, characterized by at least one of the following: the first channel (122) opens on the inlet side into a normal pressure area (94); the second channel (124) opens on the inlet side into the normal pressure area (94); the first channel (122) opens on the outlet side into a negative pressure area (92); the second channel (124) opens on the outlet side into the negative pressure area (92); In the closed position (90) of the at least one valve (42), the first channel (122) is closed on the inlet side to the normal pressure area (94); in the open position (108) of the at least one valve (42), the first channel (122) is open on the inlet side to the normal pressure region (94); the output side of the first channel (122) is permanently connected to the negative pressure area (92) in a fluidically effective manner; In the closed position (90) of the at least one valve (42), the second channel (124) is closed on the outlet side to the negative pressure area (92); in the open position (108) of the at least one valve (42), the second channel (124) is open on the outlet side to the negative pressure region (92); the input side of the second channel (124) is permanently connected to the normal pressure area (94) in a fluidically effective manner.

16. Suction device according to claim 14 or 15, characterized in that the first channel (122) extends at least with a partial area through the closing body (44), and in particular that the first channel (122) at least in a partial area through an inner wall of the closing body (44) is limited. 17. Suction device according to one of claims 14 to 16, characterized in that the first channel (122; 216; 294) and / or the second channel (124; 218; 298) at least in a partial area along a lateral outer contour of the closing body (44; 158; 188; 230; 268) ver runs, and in particular that a lateral outer wall of the closing body (44; 158; 188; 230; 268) the first channel (122; 216; 294) and / or the second channel (124; 218; 298) limited.

18. Suction device according to one of claims 14 to 17, characterized in that the first channel (122; 216; 294) and / or the second channel (124; 218; 298) has at least one first area (126; 132; 136) and at least one second area (130; 138), the at least one first area (126; 132; 136) being oriented transversely to the vertical direction (48; 204) and the at least one second area (130; 138) being at least approximately is oriented parallel to the height direction (48; 204) and in a cleaning operation a main flow direction in the at least one first region (126; 132; 136) is oriented transversely to the height direction (48; 204) and in particular is oriented radially, and in which at least one second region (130; 138) a main flow direction in the cleaning operation is oriented at least approximately parallel to the height direction (48; 204) and in particular axially.

19. Suction device according to claim 18, characterized in that the first channel (122; 216; 294) and / or the second channel (124; 218; 298) have a deflection area (128) for a flow deflection. 20. Suction device according to claim 18 or 19, characterized by at least one of the following: at least one input of the first channel (122) is arranged on a first region (126) of the first channel (122); at a second region (130) of the first channel (122) is at least one outlet of the first channel (122) arranged; at a first region (132) of the second channel (124) is at least one input of the second channel (124) arranged; in a second region (138) of the second channel (124) there is at least one outlet of the second channel (124).

21. Suction device according to one of claims 18 to 20, characterized in that the second channel (124; 218; 298) and / or the first channel (122; 216; 294) in the height direction (48; 204) spaced apart first areas (126; 132; 136), between which a second Be rich (130; 138) lies.

22. Suction device according to one of claims 18 to 21, characterized by at least one of the following: in the open position (108; 180; 238) of the at least one Ven valve (42; 166; 210; 228; 240; 266) is a first Area of the first channel (122; 216; 294) formed between an upper side of the lock body (44; 158; 188; 230; 268) and the counter device (74; 184; 252; 272); a second region (130) of the first channel (122; 216; 294) is formed in the closing body (44; 158; 188; 230; 268); in the open position (108; 180; 238) of the at least one valve (42; 166; 210; 228; 240; 266) are one or more first regions (126; 132; 136) of the second channel (124; 218; 298 ) and / or the first channel (122; 216; 294) and / or one or more second regions (130; 138) of the second channel (124; 218; 298) and / or the first channel (122; 216; 294) formed between the mating device (74; 184; 252; 272) and the closing body (44; 158; 188; 230; 268); in the open position (220) of the at least one valve (208), a first region (222) of the second channel (218) is formed between an underside of the closing body (188) and the counter-device (184).

23. Suction device according to one of claims 14 to 22, characterized by at least one of the following: the first channel (294) has at least one first inlet (296) and one second inlet (298) spaced apart from the first inlet (296); the first channel (294) is at least in a partial area in cross section T-shaped; the first channel (294) has a transverse area, at which the first inlet (296) and the second inlet (298) are arranged, a collecting area (300) being arranged on the transverse area, and wherein starting from the first inlet (296) a first partial flow (290) to the collecting area (300) and, starting from the second inlet (298), a second partial flow (292) flows to the collecting area (300); the first channel (294) has a collecting region (300) which combines partial flows (290; 292) and a combined flow is guided through the closing body (268) to the at least one filter (22).

24. Suction device according to one of the preceding claims, characterized in that the first contact area (276) and / or the second contact area (280) has a plurality of sub-contact areas (276a, 276b; 280a, 280b), in particular with at least one of the following :

Sub-contact areas (276a, 276b) of the associated first contact area (276) are at the same height in relation to the height direction (274);

Sub-contact areas (280a, 280b) of the second contact area (280) are at the same height in relation to the height direction (274); a first sub-landing area (276a, 280a) surrounds a second sub-landing area (276b, 280b);

Sub-contact areas are concentric to one another; A channel (294) is led through the closing body (268) between the sub-contact areas (276a, 276b; 280a, 280b).

25. Suction device according to one of the preceding claims, characterized in that the closing body (44; 158; 188; 230; 268) has a first disc element (54; 190) and a to the first disc element (54; 190) in the height direction ( 48; 204) has a second disk element (56; 194) spaced apart, the first contact area (70; 192; 234; 276) being arranged or formed on the first disk element (54; 190) and the second contact area (72; 196; 232 ; 280) is arranged or formed on the second disk element (56; 194), and wherein a connecting region (58; 164; 198) is positioned between the first disk element (54; 190) and the second disk element (56; 194). 26. Suction device according to claim 25, characterized in that an outer contour (66) of the connecting region (58; 164; 198) in relation to a lateral end (62; 64) of the first disk element (54; 190) and of the second disk element (56; 194) is reset.

27. Suction device according to claim 25 or 26, characterized in that the closing body (44; 158; 188; 230; 268) is C-shaped or U-shaped in cross section at the connecting area (58; 164; 198).

28. Suction device according to one of claims 25 to 27, characterized in that the counter device (74; 184; 252; 272) has a wall (78) which benelement (54; 190.) Into a space (66) between the first pane ) and the second disk element (56; 194) protrudes, the first contact area (70) resting against the wall (78), in particular in the closed position (90) of the at least one valve (42).

29. Suction device according to one of claims 25 to 28, characterized in that the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) based on the height direction (48; 204 ) point in the same direction.

30. Suction device according to one of claims 25 to 29, characterized in that the first contact area (70) on the first disc element (54; 190) points away in the direction of the at least one filter (22) and the second contact area (72 ) on the second disk element (56) facing away from the at least one filter (22), or that the first contact area (192) on the first disk element (190) assigns the at least one filter (22) and the second contact area (196) on the second disc element (194) assigns the at least one filter (22). 31. Suction device according to one of claims 25 to 30, characterized in that the first disc element (54; 190) and the second disc element (56; 194) have a different diameter.

32. Suction device according to one of the preceding claims, characterized in that the counter device (74) and the closing body (44) are designed to be adapted to one another so that when the at least one valve (42) passes from the closed position (90) to the open Position (108) the closing body (44) moves in the direction of the min least one filter (22).

33. Suction device according to one of claims 1 to 31, characterized in that the counter device (184) and the closing body (188) are designed to be adapted to one another in such a way that when the at least one valve (210) passes from the closed position (212 ) into the open position (220) the closing body (188) moves away from the at least one filter (22).

34. Suction device according to one of the preceding claims, characterized in that the counter device (74; 184; 252; 272) has a first wall (78; 200) as a counter surface for the first contact area (70; 192;) and one in the height direction (48; 204) has a second wall (84; 202) spaced apart as a counter surface for the second contact area (72; 196).

35. Suction device according to claim 34, characterized in that

between the first wall (78) and the second wall (84) an opening is arranged on the counter device (74) which is in fluid communication with a normal pressure area (94), in particular a normal for an opening of the opening (98) is oriented transversely to the height direction (48). 36. Suction device according to claim 34 or 35, characterized in that the closing body (44; 158; 188; 230; 268) with a first disc element (54; 190) and a spaced-apart second disc element (56; 194) the first wall ( 78; 200) overlaps.

37. Suction device according to one of claims 34 to 36, characterized in that the second contact area (72; 196; 232; 280) is movable between the first wall (78; 200) and the second wall (84; 202).

38. Suction device according to claim 37, characterized in that

a first space (85) is formed between the second wall (84) and the first wall (78), in which a second disc element (56) of the closing body (44) is movable, and between the first wall (78) and another Wall (87) a second space (89) is formed, in which a first disc element (54) of the closing body (44) is movable.

39. Suction device according to one of claims 34 to 36, characterized in that the first contact area (70; 192; 234; 276) is movable between the first wall (78) and the second wall (84).

40. Suction device according to claim 39, characterized in that

a first space is formed between the second wall (84) and a further wall (87), in which a second disk element (194) of the closing body (188) is movable, and between the first wall (78) and the second wall (84 ) a second space is formed in which a first disc element (190) of the closing body (188) is movable.

41. Suction device according to one of the preceding claims, characterized in that the filter cleaning device (34; 156; 182; 226; 260) has a magnetic device (102; 172). 42. Suction device according to claim 41, characterized in that the magnetic device (102) has a switchable lifting magnet (104) and that an armature (106) is connected to the closing body (44), the closing body (44) via a coupling of the armature (106) on the lifting magnet (104) can be driven in its movement.

43. Suction device according to claim 41, characterized in that the magnetic device (172) has a switchable holding magnet (174) and is connected to the closing body (158) on a counter-element (178) for the holding magnet (174).

44. Suction device according to one of the preceding claims, characterized by a spring device (116) whose spring force strives to bring the at least one valve (42) from the open position (108) into the closed position (90).

45. Suction device according to one of the preceding claims, characterized by a hand actuating element (244) which is connected to the closing body (242) and is used for manual actuation of a cleaning process.

46. Suction device according to one of the preceding claims, characterized in that the at least one valve (42; 166; 210; 228; 240; 266) and / or an actuating element (242) is assigned an elastic energy storage device (154).

47. Suction device according to one of the preceding claims, characterized in that pressure-effective surfaces for the first contact area (70; 192; 234; 276) and the second contact area (72; 196; 232; 280) are different. 48. Sucking device according to claim 47, characterized in that the pressure-acting surfaces are adapted to one another in such a way that when the suction device is in operation, the at least one valve (42) is in the closed position (90) due to a pressure difference on the pressure-acting surfaces.

49. Suction device according to one of claims 47 or 48, characterized in that the pressure-effective surfaces are adapted to one another in such a way that a force is exerted on the closing body (44) at the transition from the closed position (90) to the open position (108) is required.

50. Suction device according to claim 47, characterized in that the pressure-effective surfaces are adapted to one another in such a way that an external holding force is necessary to keep the at least one valve (166) in the closed position during operation of the suction device

(165) to hold.

51. Suction device according to claim 50, characterized in that when the holding force is no longer present, a pressure difference is present in the at least one valve

(166) brings from the closed position (165) to the open position (180).

52. Suction device according to one of the preceding claims, characterized by a battery device (32) for battery operation, in particular the suction unit (16) and the filter cleaning device (34; 156; 182; 226; 260). 53. A method for cleaning a filter (22), in particular in the case of a suction device according to one of the preceding claims, in which the filter (22) is provided with an air valve by lifting a closing body (44) of a valve (42) from a counter device (74) Cleaning flow is applied, wherein in an open position (108) of the valve (42) purge air past the closing body (44) laterally and through the

Closing body (44) flows through to which at least one filter (22) flows, and / or wherein purge air is coupled in in the open position (108) of the valve (42) on several areas spaced apart in a height direction.

54. The method according to claim 53, characterized in that in a

closed position (90) of the valve (42) the closing body (44) with a first contact area (70) and with a second contact area (72) spaced in a height direction (48) against the counter device (74), and in the open position (108) of the valve (42) flushing air flows past both the first contact area (70) and the second contact area (72) to the filter (22).

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