DE102018221060A1 - Filter device and floor cleaning device with a filter device - Google Patents

Abstract

The invention relates to a filter device for a floor cleaning device cleaning with filtered cleaning fluid, the filter device comprising a filter housing with a first housing part and a second housing part, which can be detachably connected to one another and define a filter space between them, the first housing part having a housing opening that can be closed with the second housing part has a filter element arranged in the filter space for filtering the cleaning liquid, an inlet opening into the filter space and an outlet arranged on the filter housing, the filter element being removable from the filter space via the housing opening and the inlet and the outlet being arranged at a distance from the housing opening on the second housing part or are educated. The invention also relates to a floor cleaning device.

Description

The present invention relates to a filter device for a floor cleaning device cleaning with filtered cleaning fluid.

In addition, the invention relates to a floor cleaning device with at least one cleaning tool for cleaning a floor surface, a liquid container which is fluidly connected to the cleaning tool via a fluid line, and at least one filter device for filtering the cleaning liquid.

A floor cleaning device of the type mentioned above is for example in the WO 2015/106257 A1 described.

The object of the present invention is to provide a filter device with user-friendly handling and a floor cleaning device with such a filter device.

This object is achieved by a filter device according to the invention for a floor cleaning device cleaning with filtered cleaning fluid, the filter device comprising a filter housing with a first housing part and a second housing part, which can be detachably connected to one another and define a filter space between them, the first housing part being one with the second Housing part has a closable housing opening, a filter element arranged in the filter space for filtering the cleaning liquid, an inlet opening into the filter space and an outlet arranged on the filter housing, the filter element being removable from the filter space via the housing opening and the inlet and the outlet at a distance from the housing opening on second housing part are arranged or formed.

The filter device can be connected via the inlet and the outlet into a fluid line, via which the liquid container of the floor cleaning device according to the invention is in fluid communication with its cleaning tool. Dirt particles can be filtered out of the cleaning liquid supplied to the cleaning tool via the filter device. In the filter device according to the invention, a housing opening is formed on the first housing part, through which the filter element can be removed from the filter space. The inlet and the outlet are arranged at a distance from the housing opening. When the filter element is removed, the inlet and the outlet can preferably remain connected to a fluid line, and the filter element can in particular be removed from the filter space in a direction pointing away from the inlet and outlet. Contact of the user with cleaning fluid, possibly with a cleaning chemical added to it, can be largely avoided. In particular, leakage or dripping of cleaning fluid at the outlet or inlet and / or from a fluid line connected to it can be avoided - for example in contrast to that mentioned in the introduction WO 2015/106257 A1 Floor cleaning device described.

It is particularly advantageous if the filter device is installed on the floor cleaning device in such a way that the filter element can be removed upwards. When the second housing part is detached from the first housing part, it is preferably largely avoidable that cleaning liquid runs out of the filter space and leads to contamination of the user, the floor cleaning device and / or the environment.

Position and orientation information such as “top”, “bottom”, “vertical”, “horizontal” or the like are to be understood in the present case as relating to the intended use of the filter device with the floor cleaning device. When used as intended, the floor cleaning device is positioned on a footprint that can be viewed in particular as horizontally oriented. The filter device is installed as intended in an installed or set position in the floor cleaning device.

The housing opening is arranged, for example, on a first side of the first housing part, the inlet and / or the outlet preferably on or near a second side of the first housing part, which is opposite the first side.

The outlet is preferably arranged or formed on a housing wall of the first housing part opposite the housing opening. The wall is, in particular, a bottom wall of the filter housing, on the assumption that the filter device is oriented with the bottom wall facing downward in relation to a direction of gravity. The filter element can be removed upward from the filter space in a direction pointing away from the bottom wall.

A direction of passage through the housing opening is preferably oriented vertically or essentially vertically.

It is expedient if a connection element is arranged or formed at the outlet, which is connected in a fluid-tight manner to a corresponding connection element of the filter element. For example, the filter element with the connection element rests on the connection element of the outlet, preferably a sealing element for sealing is provided between the filter element and the outlet.

It proves to be advantageous if the inlet is arranged at a distance from a housing wall of the first housing part, which is opposite the housing opening. It is conceivable, for example, that particles which are carried along by the cleaning liquid are deposited in the filter space on the housing wall. The distance between the inlet and the housing wall can ensure that particles do not block the inlet. In addition, it can largely be avoided that inflowing cleaning fluid whirls up the particles. The housing wall can in particular be the above-mentioned bottom wall of the filter housing.

In a preferred embodiment, the distance of the inlet from the housing wall is approximately 1/10 to approximately 2/3 of the extent of the first housing part from the housing wall to the housing opening, for example approximately 1/5 of the distance.

It can be provided that a connection element of the outlet for a fluid line projects axially from the first housing part. For example, the first housing part and / or the filter device has an overall substantially cylindrical shape and defines an axis along which the connection element is aligned.

It can be provided that a connection element of the inlet for a fluid line protrudes radially or tangentially from the first housing part, "radial" or "tangential" referring in particular to the above-mentioned axis.

The first housing part is, for example, a cup-shaped housing part. In a preferred embodiment, the second housing part is a housing cover, which is arranged in particular on the top side of the filter device, based on its preferred installation position.

The housing parts can, for example, be releasably engaged with one another by a force fit and / or form fit. For example, jamming and / or locking of the housing parts to one another is conceivable.

It proves to be advantageous if the second housing part can be detached from the first housing part manually and / or without tools, in order to make maintenance of the filter device easier for a user.

In a preferred embodiment of the filter device, the second housing part can be connected to the first housing part by screwing. To remove the filter element, the second housing part, in particular a housing cover, can be unscrewed from the first housing part and the filter space can thereby be opened. Conversely, the filter space can be closed by screwing the second housing part to the first housing part.

It is expedient if the second housing part comprises or forms a rotary handle in order to facilitate the screwing movement with the second housing part for the user. For example, a protruding ledge or rib is formed on the second housing part for this purpose.

It can be provided that the first housing part has an external thread and the second housing part has an internal thread. The second housing part can overlap the first housing part in the connected state.

Alternatively, it can be provided that the first housing part has an internal thread and the second housing part has an external thread. Such a configuration proves to be particularly advantageous if walls of the second housing part are formed by a housing of the floor cleaning device, which for example simultaneously forms a container wall of the floor cleaning device.

The filter housing, in particular the first housing part, can be cylindrical or essentially cylindrical.

In a preferred embodiment, the filter element can be cylindrical or essentially cylindrical. For example, the filter element is designed as a filter cartridge.

The filter element has, for example, a circumferential jacket, with a plurality of through openings for cleaning liquid formed thereon. On the inside, the filter element can have an interior into which cleaning fluid passes through the jacket.

For example, a connection element is formed on an end face of the filter element, which is connected to the outlet in a fluid-tight manner.

In one preferred embodiment, the filter element is closed on an end face of the filter element that faces away from the outlet. In another type of embodiment, it can be provided that at least one passage opening is formed on the filter element on the end face, through which cleaning liquid can pass filtered into the interior.

The filter element comprises or forms, for example, a stainless steel surface filter.

The filter element can be configured, for example, as a permanent filter element or as a removable filter element.

A suitability of the filter element to retain particles larger than approximately 300 μm to 50 μm, for example larger than approximately 100 μm, has proven to be favorable.

It is expedient if the filter housing comprises or forms a discharge element for cleaning fluid flowing into the filter space through the inlet, which is set into an annular flow in the filter space via the discharge element. For example, cleaning fluid flows radially into the filter space with respect to the aforementioned axis. The diverting element can for example run in sections in the circumferential direction of the axis in order to set the cleaning liquid impinging on it in an annular flow. This can preferably have the advantage that any dirt particles carried in the cleaning liquid settle on a bottom wall of the filter housing and the filter element is thereby clogged to a lesser extent with dirt particles.

The filter housing preferably comprises a flushing outlet, via which the filter chamber can be brought into flow connection with a flushing line that can be connected to it. Contamination can be removed from the filter housing through the flushing outlet.

For example, the flush outlet is formed separately from the inlet. Cleaning fluid can flow through the inlet through the filter chamber, detect any impurities and discharge through the rinsing outlet. Alternatively, it can be provided that the flushing outlet is formed by the inlet and a separate flushing inlet is provided. In the latter case, cleaning fluid can flow through the flushing inlet, capture any dirt particles and discharge it through the inlet, which acts as a flushing outlet.

The flushing outlet is advantageously arranged or formed on the first housing part.

It is advantageously provided that the rinsing outlet is arranged or formed on a bottom wall of the filter housing, in particular of the first housing part. This proves to be beneficial for removing dirt particles on or near the bottom wall from the filter housing.

The flushing outlet preferably projects tangentially from a housing wall of the filter housing, in particular of the first housing part. This is beneficial for removing dirt particles from the filter housing.

For example, the flushing outlet is arranged on the side next to the outlet. In this way, a compact design of the filter device can be achieved.

The flushing outlet is preferably arranged below the inlet. In the flushing operation through the inlet, cleaning liquid can thereby better grasp any dirt particles under the effect of gravity and discharge them through the flushing outlet.

It can be advantageous if the flushing outlet is oriented downward, which supports the removal of dirt particles by the influence of gravity.

It is advantageous if a ventilation opening for connecting a ventilation line is arranged on the filter housing, in particular on the first housing part. The filter chamber can be vented via the ventilation opening, for example when filling with cleaning fluid or when opening the filter housing.

For example, the vent line opens into the liquid container.

The vent opening is preferably at a smaller distance from the housing opening than the inlet and the outlet. In particular, it can be provided that the ventilation opening is arranged above the inlet and the outlet when the filter device is installed as intended.

It is advantageous if the second housing part comprises a connecting device on which the filter element can be detachably fixed, in particular for inserting the filter element into the filter space and / or removing the filter element from the filter space via the second housing part. This considerably simplifies the handling of the filter device and in particular the filter element for a user. The filter element can be detached and removed from the first housing part together with the second housing part. This can largely prevent the user from coming into contact with the cleaning liquid while the filter device is being maintained.

The connecting device can be designed in a variety of ways. For example, a non-positive and / or positive connection of the second housing part to the filter element is provided, for example by jamming and / or latching. At In an advantageous embodiment, the connecting device can have, for example, latching hooks on the second housing part, which engage in corresponding latching receptacles on the filter element, or vice versa.

It can be provided that corresponding alignment elements are arranged on the second housing part and on the filter element, in order to make it easier for a user to connect the filter element to the second housing part. For example, an alignment projection and a corresponding receptacle are provided.

It can be provided that the second housing part comprises or forms at least one support element or one is arranged on the second housing part, the filter element being supported on opposite sides on the at least one support element and on the outlet. In this way, a defined position of the filter element in the filter space can be ensured. The filter element can, for example, rest against the outlet with a first end face. For example, corresponding connection elements of the filter element and the outlet couple with one another. On a side facing away from the outlet, the filter element can be supported on the second housing part via the at least one support element. In the closed state of the filter housing, the filter element assumes a defined position between the outlet and the second housing part. It can be provided that the at least one support element acts as a hold-down device, which acts on the filter element with a force directed at the outlet.

In a preferred embodiment it can be provided that the alignment element mentioned above forms a support element.

The filter element is advantageously arranged in a form-fitting manner in the filter space between the second housing part and the outlet, as a result of which the position of the filter element in the filter space is clearly defined and a reliable function of the filter device can be ensured. For example, the filter element is arranged in a form-fitting manner between a connection element of the outlet and the above-mentioned at least one support element. The at least one support element can be, for example, a projection of a wall of the second housing part. Alternatively, the support element can be formed by a wall, for example a ceiling wall of the second housing part, wherein the filter element can in particular lie flat against the ceiling wall.

The above-mentioned object is achieved by a floor cleaning device according to the invention, comprising a cleaning tool for cleaning a floor surface, a liquid container which is fluidly connected to the cleaning tool via a fluid line, and at least one filter device of the aforementioned type which is connected into the fluid line.

The advantages that have already been mentioned in connection with the explanation of the filter device according to the invention can also be achieved with the floor cleaning device. In this regard, reference can be made to the above explanations.

Advantageous embodiments of the floor cleaning device according to the invention result from advantageous embodiments of the filter device according to the invention. In this regard, too, reference can be made to the above explanations.

It is expedient if the at least one filter device is aligned in a vertical direction, with the second housing part on the top, on the floor cleaning device. For example, the at least one filter device is oriented vertically or essentially vertically.

When the floor cleaning device is used as intended, the filter element can preferably be removed upward from the filter space in a direction pointing away from the floor space for the floor cleaning device.

It can be provided that a user can detach the second housing part from the first housing part while the latter remains in the at least one receptacle.

As an alternative or in addition, it can be provided that the at least one filter device can be removed as a whole from the at least one receptacle. For this purpose, detachable plug connections to the fluid line are preferably provided at the inlet and / or outlet.

It is advantageous if the floor cleaning device comprises a housing in which the liquid container is arranged or from which housing the liquid container is formed, and that the housing comprises or forms at least one receptacle for the at least one filter device. This enables a structurally simple configuration of the floor cleaning device, in which the filter device can be accommodated in the receptacle of the housing.

It is expedient if the housing comprises a movable housing part which can be transferred from a closed position into an open position, wherein the at least one receptacle in which the housing part occupies the closed position and the at least one filter device is freely accessible in the open position of the housing part. By moving the housing part of the floor cleaning device into the open position, the user can access the second housing part.

The housing part can moreover preferably be movably mounted on the housing, in particular pivotably mounted.

The housing part is expediently a housing cover which closes the liquid container in the closed position and opens an opening of the liquid container in the open position. As a result, it is not necessary to provide various types of movable housing parts for closing the liquid container and the at least one receptacle. This facilitates the design of the floor cleaning device.

In a preferred embodiment, the at least one filter device, in particular in the at least one receptacle, is arranged laterally next to the liquid container. This enables a compact design of the floor cleaning device and makes it easier for a user to access the filter device. For example, the filter device is arranged directly to the side of the liquid container.

In the case of a plurality of filter devices, it can be provided that two filter devices are arranged on two opposite sides of the liquid container.

It is advantageous if the liquid container comprises a container wall, which can be formed in particular by a housing of the floor cleaning device. The container wall is, for example, a side wall of the liquid container.

The first housing part is advantageously formed at least partially in one piece with the container wall. This enables a particularly simple structural design of the floor cleaning device. For example, the container wall is a side wall of the liquid container, which is integrally connected to a side wall and / or a bottom wall of the first housing part.

In a preferred embodiment of the floor cleaning device, in particular in combination with the last described embodiment, it can be provided that there is no housing part of the floor cleaning device covering the receptacle for the filter device and the second housing part of the filter device is preferably freely accessible.

It is advantageous if the floor cleaning device comprises two or more filter devices.

The two or more filter devices are preferably connected in branching and recombining sections of the fluid line.

Alternatively, it can be provided that each filter device is connected to its own fluid line, via which the liquid container is in flow connection with the cleaning tool.

In a preferred embodiment, the floor cleaning device comprises at least one supply line which opens into the fluid line on the upstream side of the at least one filter device. This gives the possibility of supplying cleaning liquid for rinsing the at least one filter device and cleaning it via the supply line.

The floor cleaning device advantageously comprises at least one rinsing line which is connected to the rinsing outlet and opens into the liquid container, which has proven to be advantageous in particular in combination with the last-mentioned advantageous embodiment. The cleaning fluid supplied via the supply line flows through the filter housing, collects any dirt particles and can be removed via the flushing outlet and the flushing line.

In particular, it can be provided that, in comparison with normal operation, the filter element can be flowed through in the reverse direction in a flushing operation. For example, cleaning fluid can flow through the outlet into the at least one filter device and detach any dirt particles from the filter element in reverse flow. As explained above, these dirt particles can be removed from the filter housing by flushing them with cleaning liquid via the inlet and the flushing outlet. Alternatively, the above-mentioned flushing inlet can be provided, and dirt particles can be removed through the inlet acting as a flushing outlet.

The floor cleaning device preferably comprises at least one ventilation line, which is connected to the ventilation opening and opens into the liquid container.

It is expedient if the floor cleaning device comprises a dirt holding device, via which the dirt liquid picked up by the floor surface can be transferred into the liquid container. The floor cleaning device can, in particular, do without a separate container for fresh cleaning liquid and Recycle cleaning fluid. After the floor surface has been cleaned, the dirty liquid is sucked in, for example under the action of a suction unit, and transferred into the liquid container. For further use, the dirty liquid flows through the fluid line, is freed of dirt particles by the at least one filter device and fed back to the cleaning tool.

It is expedient if a further filter device is provided, which is preferably arranged at an outlet of the liquid container. The further filter device preferably comprises a coarser filtration property than the at least one filter device. Coarse dirt can already be filtered with the additional filter device and thereby avoids clogging of the fluid line.

The floor cleaning device can be designed, for example, as a scrubber drier.

• 1: eine schematische perspektivische Darstellung einer erfindungsgemäßen Bodenreinigungsvorrichtung mit einer erfindungsgemä-ßen Filtereinrichtung;
• 2: ein Blockschaltbild der Bodenreinigungsvorrichtung aus 1;
• 3: eine schematische perspektivische Teildarstellung der Bodenreinigungsvorrichtung aus 1 mit Blick auf einen geöffneten Flüssigkeitsbehälter für Reinigungsflüssigkeit und eine Filtereinrichtung;
• 4: eine perspektivische Darstellung einer erfindungsgemäßen Filtereinrichtung, wobei deren Gehäuseteile voneinander gelöst sind;
• 5: eine Schnittansicht der Filtereinrichtung längs der Linie 5-5 in 4, wobei die Gehäuseteile miteinander verbunden sind;
• 6: eine Darstellung entsprechend 5 in einer Explosionsdarstellung, wobei das Filterelement der Filtereinrichtung von deren Gehäusedeckel gelöst ist;
• 7: ein Blockschaltbild einer weiteren erfindungsgemäßen Bodenreinigungsvorrichtung in einer der 2 entsprechenden Weise;
• 8: eine perspektivische Darstellung einer weiteren bevorzugten Ausführungsform einer erfindungsgemäßen Filtereinrichtung in einer Explosionsdarstell u ng;
• 9: eine Schnittansicht der Filtereinrichtung aus 8;
• 10: eine Schnittansicht der Filtereinrichtung längs der Linie 10-10 in 9; und
• 11: eine Schnittansicht der Filtereinrichtung längs der Linie 11-11 in 9.

The following description of preferred embodiments of the invention serves in conjunction with the drawing to explain the invention in more detail. Show it:

• 1 : a schematic perspective view of a floor cleaning device according to the invention with a filter device according to the invention;
• 2nd : a block diagram of the floor cleaning device from 1 ;
• 3rd : A schematic partial perspective view of the floor cleaning device from 1 with a view of an open liquid container for cleaning liquid and a filter device;
• 4th a perspective view of a filter device according to the invention, the housing parts of which are detached from one another;
• 5 : a sectional view of the filter device along the line 5-5 in 4th , wherein the housing parts are connected to each other;
• 6 : a representation accordingly 5 in an exploded view, wherein the filter element of the filter device is detached from its housing cover;
• 7 : A block diagram of a further floor cleaning device according to the invention in one of the 2nd appropriate way;
• 8th : a perspective view of a further preferred embodiment of a filter device according to the invention in an exploded view;
• 9 : a sectional view of the filter device from 8th ;
• 10th : a sectional view of the filter device along the line 10-10 in 9 ; and
• 11 : a sectional view of the filter device along the line 11-11 in 9 .

1 shows a total with the reference symbol 10th proven advantageous embodiment of a floor cleaning device according to the invention. The floor cleaning device 10th is as a scrubber drier 12 designed by a user, not shown in the drawing, for cleaning a floor surface 14 to be led.

For moving on the floor surface 14 includes the floor cleaning device 10th a landing gear 16 , and the user is usually in relation to a longitudinal or main direction of movement 18th , behind the floor cleaning device 10th . At the back 20th is an operating unit 22 arranged for the user.

For cleaning the floor surface 14 includes the floor cleaning device 10th a cleaning tool 24th . The cleaning tool 24th in the present case comprises a plate brush 26 . Via a fluid line 28 can use the cleaning tool 24th a cleaning liquid can be supplied. The cleaning liquid is in particular water, to which a cleaning chemical can be added to increase the cleaning effect.

The mixture of cleaning liquid and detached dirt can be removed by means of a dirt collecting device 30th the floor cleaning device 10th from the floor area 14 recorded and placed in a liquid container 32 be transferred. The dirt collecting device 30th encompasses the floor area 14 scraping squeegee 34 and a the liquid container 32 and the squeegee 34 suction unit with vacuum 36 .

The floor cleaning device 10th is a single-tank device, in addition to the liquid container 32 no further liquid container for cleaning liquid or, after absorption from the floor surface 14 , Dirty liquid is used. The fluid line 28 is at an outlet 38 of the liquid container 32 shot.

Accordingly, cleaning liquid in the floor cleaning device 10th recovered. The originally clean cleaning liquid affects the floor surface 14 . This dirty liquid is sucked off in the manner explained below by means of filter devices of the floor cleaning device 10th cleaned and the cleaning tool 24th fed again.

The cleaning chemical can be in a container 40 be stocked and the Cleaning liquid via a supply line 42 be fed into which a pump unit 44 can be switched.

The floor cleaning device 10th includes a housing 46 . The housing 46 forms the liquid container 32 . In particular, the housing forms 46 Container walls of the liquid container 32 , in the present case a floor wall 48 and a side wall 50 . The side wall 50 is all-round and stands on the bottom wall 48 upwards.

Position and orientation information such as "top", "bottom", "vertical", "horizontal" or the like are present as intended use of the floor cleaning device 10th related. The floor cleaning device is in its intended use 10th on the of the floor area 14 defined footprint, the floor area 14 in the present case can be seen as horizontally aligned.

The liquid container is on the top 32 a container opening 52 on. The container opening 52 is from one of the housing 46 formed edge 54 edged. The edge 54 is designed as a flat edge.

For closing and opening the container opening 52 includes the housing 46 a movable housing part 56 . The housing part 56 is designed as a housing cover 58 . The housing cover 58 is on the housing 46 otherwise movably and in particular pivotally mounted. In relation to the longitudinal direction 18th is the housing cover 58 at the back section of the edge 54 about a transverse pivot axis, in the present case horizontal pivot axis 60 pivoted.

The housing cover 58 can from one in 1 shown open position in a closed position not shown in the drawing and vice versa. The housing cover is in the open position 58 from the edge 54 raised and gives the container opening 52 as well as the edge 54 free. The housing cover is in the closed position 58 on the edge 54 so that this and the container opening 52 are covered and the liquid container 32 closed is.

That from the dirt pickup device 30th aspirated liquid is through a suction line 62 raised and a filter device 64 fed (only in 3rd shown schematically). The filter device 64 includes a sieve 66 for coarse dirt. The user can use the sieve 66 remove and empty manually if necessary.

At the outlet 38 of the liquid container 32 is another filter device 68 arranged. The filter device 68 includes, for example, a cartridge filter 70 that retains dirt particles about 500 µm or larger in size. Through the fluid line 28 flowing cleaning liquid is therefore already pre-filtered.

In the fluid line 28 is a pump unit 72 switched to increase the pressure of the cleaning liquid.

The floor cleaning device 10th comprises at least one preferred embodiment of a filter device according to the invention 74 that in the fluid line 28 is switched. There are two filter devices 74 available.

The fluid line 28 branches in the present case the pump unit 72 downstream in two sections 76 , in each of the filter devices 74 is switched. The sections 76 flow direction unite after the filter devices 74 again.

To accommodate the filter device 74 includes the floor cleaning device 10th each assigned a recording 78 . The recordings 78 are from the housing 46 educated ( 1 and 3rd ).

The recordings 78 are each on the side next to and in particular directly next to the liquid container 32 arranged. Here are the recordings 78 regarding the liquid container 32 positioned opposite each other. Every shot 78 points one from the case 46 formed depression 80 in which the respective filter device 74 can be positioned. The filter device protrudes 74 not over the edge 54 out. For example, an upper side of the filter device is aligned 74 with the edge 54 .

In the closed position of the housing cover 58 become the filter devices 74 covered and are thus protected against dirt and external access. By transferring the housing cover 58 in the open position, the user has direct access to the filter devices in a user-friendly manner 74 . This makes maintenance easier. It is advantageous that there is no separate cover for closing the recordings 78 is provided. With the housing cover 58 can both the liquid container in the closed position 32 as well as the recordings 78 be closed.

In the following, with particular reference to 4th to 6 on the construction of the filter devices 74 received. The filter devices 74 are identical, which is why only one filter device is used 74 is received. The following explanations apply in correspondingly for the other filter device 74 .

The filter device 74 includes a filter housing 82 , which is a first housing part 84 and a second housing part 86 includes.

The first housing part 84 is designed as a housing pot 88 , which is essentially cylindrical and has an axis 90 Are defined. The housing part 84 has a housing wall 92 on, which in the present case is in particular a floor wall 94 of the housing part 84 and the filter housing 82 acts.

In the present case, “bottom wall” refers to an intended or installed position of the filter device 74 in the floor cleaning device 10th . Here is the filter device 74 with the bottom wall 94 leading in the upward open admission 78 used ( 1 and 3rd ).

From the bottom wall 94 is a side wall facing upwards in relation to the installation position 96 towards the housing part 86 from. The side wall 96 forms a jacket of the housing part 84 and, at least in part, the filter housing 82 .

On the bottom wall 94 opposite side comprises the housing part 84 a case opening 98 . The case opening 98 and the bottom wall 94 are accordingly on opposite sides of the housing part 84 arranged.

At the the housing opening 98 forming side has the housing part 84 a thread 100 on, in the present case in particular as an external thread of the side wall 96 is designed.

The second housing part 86 is available as a housing cover 102 of the filter housing 82 designed. The housing cover 102 has a housing wall 104 of the filter housing 84 on, in the present case designed as a ceiling wall 106 , based on the installation position of the filter device 74 .

From the ceiling wall 106 there is a side wall 108 down towards the bottom wall 94 . On the side wall 108 is a thread 110 arranged, in the form of an internal thread.

The diameter of the case cover 102 is larger than the diameter of the housing pot 88 so that the housing cover 102 the housing pot 88 at the housing opening 98 can overpower. In particular, the housing parts 84 , 86 by screwing the threads 100 , 110 be releasably connected.

It goes without saying that instead of the screw connection or in addition to the screw connection, a different type of releasable fixing of the housing parts 84 , 86 can be provided together.

The housing cover 102 forms a twist grip that can be handled manually and without tools by the user 112 . To a user turning the twist grip 112 to facilitate this one points from the ceiling wall 106 protruding rib 114 on.

The housing parts 84 , 86 define a filter space between them 116 , which can be flowed through by cleaning liquid as explained below. Are the housing parts 84 , 86 screwed together is the filter chamber 116 locked ( 5 ). Is the housing cover 102 from the housing pot 88 solved, is the filter room 116 open. Even the case opening 98 is open and released ( 3rd , 4th and 6 ).

The filter device 74 includes one on the filter housing 82 and in particular on the first housing part 84 arranged inlet 118 . The entrance 118 has a connection element 120 for the fluid line 28 on. The entrance 118 is on the inflow side of the fluid line 28 connected and preferably releasably connectable, the connection can preferably be released manually and without tools by the user.

The connection element 120 is on the side wall 96 arranged and points from the bottom wall 94 a distance on. The distance is, for example, approximately one fifth of the distance from the bottom wall 94 from the housing opening 98 .

Should particles carried by the cleaning liquid stick to the bottom wall 94 settle is determined by the distance of the inlet 118 to the bottom wall 94 ensured that the fluid line 28 does not clog on the inlet side. In addition, it can largely be avoided that entering cleaning liquid causes swirling of the deposited particles.

Relative to the axis 90 is the entrance 118 in the present case, radially from the housing pot 88 from. Alternatively, a tangential orientation of the inlet could be used 118 be provided.

The filter device 74 also includes an outlet 122 , the downstream side with the fluid line 28 connected (the inlet 118 and the outlet 122 are in a respective section 76 switched). The outlet points to this 122 a connector 124 on. The connection of the connection elements 124 with the fluid line 28 can preferably be solved manually and without tools by the user. In addition, the connection of the fluid line 28 with the inlet 118 solved, there is in particular the advantage that the filter device 74 the recording 78 can be removed as a whole. This facilitates the exchange and maintenance of the filter device 74 considerably.

The outlet 122 is on the bottom wall 92 arranged. Relative to the axis 90 is the connection element 124 axially from the housing part 86 from.

The outlet 122 has a further connection element 126 on. The connection element 126 protrudes from the bottom wall 94 into the filter room 116 . The connection element 126 is designed in a ring shape, for example.

The filter device has for filtering the cleaning liquid 74 a filter element 128 on. The filter element 128 is designed as a cartridge filter 130 , which has a substantially cylindrical shape and coaxial to the filter housing 82 is aligned.

The filter element 128 has a coat 132 with a large number of through-openings, through which the cleaning liquid to be filtered passes into one of the jacket 132 enclosed interior 134 can occur ( 5 ). On a first side and especially an end side 136 that of the housing opening 98 faces the filter element 128 a cover element 138 on. On a second side and especially the end side 140 who the bottom wall 94 faces the filter element 128 another cover element 142 on.

The cover element 142 has a through opening and forms a connection element 144 that with the connector 126 is connected in a fluid-tight manner. A separate sealing element can be provided for sealing, alternatively the cover element 142 For example, be itself elastically deformable and have a sealing effect. The connection element 144 engages in the of the connection element 126 formed ring.

The cover element 138 closes the interior 134 at the end 136 fluid tight. Alternatively, in the cover element 138 Passages are formed through the cleaning liquid to be filtered through into the interior 134 can reach. In the cover element 138 is an alignment element 146 arranged, in the present case designed as a receptacle ( 3rd ).

The filter device 74 , especially the housing cover 102 , has a connecting device 148 on. Via the connection device 148 is the filter element 128 detachable with the housing cover 102 connected. In particular, the connection can be released manually and without tools by the user.

The connection device 148 includes locking elements 150 , here in the form of locking hooks. The locking elements 150 are in the circumferential direction of the axis 90 spaced from each other and protrude from the ceiling wall 106 towards the bottom wall 94 into the filter room 116 . Preferably two or more locking elements 150 intended.

The locking elements 150 can with corresponding locking elements 152 , in the form of snap-in receptacles, on the filter element 128 work together. As a corresponding locking element 152 in the present case there is a border 154 of the cover element 138 that over the coat 132 survives. The locking elements 150 reach under the edge 154 , causing the filter element 128 on the housing cover 102 is fixed.

The engagement of the housing cover 102 with the filter element 128 exists until the user clicks between the locking elements 150 , 152 picks up.

On the housing cover 102 is also an alignment element comprised by the latter 156 arranged in the form of a projection. The alignment element 156 can with the alignment element 146 of the filter element 128 interact and its correct alignment relative to the housing cover 102 to ensure. The projection engages in the receptacle of the cover element 138 a ( 5 ).

At the filter device 74 forms the alignment element 156 at the same time a support element on which the filter element 128 towards the housing cover 102 can support. Here is the filter element 128 form-fitting between the outlet 122 , in particular its connecting element 126 , and the support element 156 arranged. In this way, the position of the filter element 128 in the filter room 116 clearly defined.

Between the cover element 138 and the ceiling wall 106 is a space 157 available. This is advantageous, for example, if, as explained above, in the cover element 138 Passages for cleaning liquid are formed.

In a preferred embodiment of the filter device according to the invention it can be provided that the filter element 128 up to a wall of the housing cover 102 extends, especially to the ceiling wall 106 . The filter element 128 can be on the ceiling wall 106 support that a flat support element for the filter element 128 trains. The 5 shows with a dashed outline 138 ' in this case the position of the Cover element 138 of the filter element 128 . It is understood that the filter element 128 in this case up to the ceiling wall 106 extends and preferably form-fitting between the outlet 122 , in particular its connecting element 126 , and the ceiling wall 106 is arranged. In this case there is no space 157 .

The filter housing is in use 82 closed, the housing parts 84 , 86 are screwed together and the filter element 128 in the filter room 116 is arranged. Cleaning fluid flows through the inlet 118 into the filter room 116 and through the passage openings of the filter element 128 through into its interior 134 . From the interior 134 the cleaning fluid flows through the connection elements 144 , 126 and 124 through the outlet 122 and can use the cleaning tool 24th are fed.

The filter device 74 is here to filter particles with a size of more than about 100 microns from the cleaning liquid.

On the filter device 74 can be used for maintenance, for example for cleaning and / or replacing the filter element 128 , can be accessed in a user-friendly way.

The filter device 74 can be done by moving the housing cover 58 be exposed in the open position so that the recording 78 and the filter device 74 the user in the in the 1 and 3rd presented way.

If the filter device 74 can be removed in total, the inlet 118 and the outlet 122 from the fluid line 28 can be solved manually and without tools. The removal of the filter device 74 is up for the user from the recording 78 easy to use.

Alternatively, it can be provided that the filter device 74 overall firmly in the recording 78 held and cannot be detached from it, although the housing cover 102 can be removable.

If, for example, the housing pot 88 in the recording 78 can remain, for example, to replace and / or to clean the filter element 128 , the housing cover 102 easy to use from the housing pot 88 be unscrewed. The fact that the filter element 128 via the connection device 148 on the housing cover 102 is held, the user can remove the housing cover 102 including filter element 128 lift and up out of the housing pot 88 remove ( 4th ; 3rd shows the housing cover 102 already in the filter element 128 dissolved state, as well 6 ).

The drawing direction is in the drawing by one with the reference symbol 158 marked arrow. In particular, the pull-out direction 158 be aligned vertically, based on the target position of the filter device 74 whose axis 90 is preferably aligned vertically.

In a preferred embodiment it can be provided that a wall of the housing pot 88 from the housing 46 is formed.

At the filter device 74 it turns out to be advantageous that the inlet 118 and the outlet 122 at a distance from the housing opening 98 are arranged, in particular on or near the bottom wall 94 that of the housing opening 98 opposite. It is not necessary to use the fluid line 28 to remove the filter element 128 from the entrance 118 and from the outlet 122 to solve. An undesirable leakage of cleaning fluid and possibly the cleaning chemical from the fluid line 28 can be avoided.

It also reduces the likelihood of cleaning fluid as well as the cleaning chemical from the filter room 116 emerges because of the filter element 128 is lifted upwards. Pollution of the recording 78 , the floor cleaning device 10th overall, the user and / or the environment can be largely avoided.

When lifting the filter element 128 become the connection elements 144 , 126 separated from each other. Any cleaning fluid in the interior 134 can drain off and remains in the filter room 116 .

The contact of the user with cleaning fluid or the cleaning chemical can also be avoided in particular if the filter element 128 in the one with the housing cover 102 connected state on the housing cover 102 raised and out of the housing pot 88 can be removed.

In operation of the floor cleaning device 10th cleaning liquid gets under the action of the pump unit 72 through the fluid line 28 and their sections 76 . The means of the filter devices 74 filtered cleaning liquid passes through the respective outlet 122 and one in the fluid line 28 switched valve up to the cleaning device 24th .

The filter devices 74 can be cleaned by moving the flow from the respective outlet 122 to the respective entrance 118 is reversed. For this purpose, a supply line 170 by means of a connecting element to a Liquid supply network can be connected. Liquid, especially water, can pass through the supply line 170 over that into the fluid line 28 switched valve the outlets 122 are fed. The filter elements 132 can be flowed through in the opposite direction to normal operation. Dirt particles are removed from the filter element 128 replaced.

The entrained dirt particles are carried through the fluid line 28 via a the pump unit 72 immediate bypass line 172 in the liquid container 32 rinsed and can from there via an outlet line 174 be removed.

Via the supply line 170 can the filter devices 74 after blocking the bypass line 174 can also be filled with clean cleaning fluid.

The filter device 74 includes one on the filter housing 82 arranged ventilation opening 160 . The vent 160 is on the first housing part 84 formed and points from the housing opening 98 a closer distance than the inlet 118 and the outlet 122 . This makes it particularly above the inlet 118 and the outlet 122 arranged. In the present case, the vent is 160 in the upper area of the housing pot 88 arranged, just below the thread 100 .

In the vent 160 is a vent line 162 used sealingly with an opening 164 in the filter room 116 is arranged. The vent line 162 flows into the liquid container 32 . There are two merging sections 166 the vent line 162 provided, each section 166 with one of the filter devices 74 connected is ( 2nd ). Via the vent line 162 can, for example when filling the filter devices 74 , when a valve is released in the vent line 162 , Air will be displaced.

The valve in the vent line 162 is particularly, like the other valves and / or the electrical components of the floor cleaning device 10th , from their control device 168 ( 2nd ) controllable.

Below is a reference to the 7 to 11 to another, with the reference number 180 documented preferred embodiment of the floor cleaning device according to the invention, the present two filter devices 190 according to a further preferred embodiment of the filter device according to the invention.

For the same or equivalent features and components of the floor cleaning devices 10th and 180 or the filter devices 74 and 190 identical reference numerals are used. The one with the floor cleaning device 10th and the filter device 74 Achievable benefits can be achieved with the floor cleaning device 180 or the filter device 190 can also be achieved, so that reference can be made to the above statements in this regard. The main differences are therefore dealt with below.

How especially out 9 is the filter element 128 also essentially form-fitting between the outlet 122 , in particular its connecting element 126 , and the second housing part 86 in the form of the housing cover 102 in the filter room 116 added. The filter element 132 stands above the connection element 144 in fluid-tight connection with the connection element 126 , this in a recess on the filter element 128 intervenes.

The cover element 138 can lie flat on the housing cover 102 support.

Even with the filter device 190 is the connection device 148 for connecting the filter element 128 with the housing cover 102 intended. The hook-shaped locking elements are there 150 with the locking elements 152 of the edge 154 in mobile engagement. Is the filter housing 82 however closed, with screwing of the housing parts 84 , 86 with each other, are the projections of the locking elements 150 at a distance from the edge 154 arranged ( 9 ).

To open the filter housing 82 becomes the case cover 102 from the housing pot 88 unscrewed, and the locking elements 150 move towards the edge 154 until you contact them. With further movement of the housing cover 102 in the pull-out direction 158 can the filter element 128 im with the housing cover 102 connected state to the filter room 116 be removed.

At the filter device 190 hits through the inlet 118 flowing cleaning liquid on a discharge element 192 . The discharge element 192 is from the first housing part 84 formed and stands from the side wall in the filter chamber 116 from. The discharge element 192 extends in the circumferential direction of the axis over a predetermined angular range, for example approximately 90 degrees. The discharge element extends in the axial direction 92 advantageously at least via the cross-sectional opening of the inlet 118 .

Via the discharge element 192 becomes cleaning fluid flowing in a ring flow around the axis 90 transferred. This has the advantage that any dirt particles that are carried along are at the bottom the bottom wall 94 settle and the filter element 128 is only added to a lesser extent with dirt particles.

The filter device 190 also includes a flush outlet 194 . The flush outlet 194 is particularly present on the first housing part 86 formed and preferably to the side of the outlet 122 arranged. The flush outlet is accordingly 194 on the bottom wall 94 and below the inlet 118 arranged.

The flush outlet 194 is tangent to the housing pot 88 and includes a connection element 196 for connecting a flushing line 198 .

The flush line 198 includes in the floor cleaning device 180 two merging, each at a flush outlet 194 connected sections 200 . One in the flush line 198 switched valve is from the control device 168 controllable. The flush line 198 branches the pumping unit 72 upstream in the fluid line 28 a. To a certain extent, this forms one in the liquid container 34 opening section of the flushing line 198 .

The branching of the fluid line 28 into the sections 76 upstream branches into the fluid line 28 a supply line 202 a. The supply line 202 in the present case branches from the supply line 170 and has a controllable valve. Via the supply lines 170 , 202 supplied cleaning liquid can through the inlet 118 into the filter room 116 reach.

In normal operation of the floor cleaning device 180 cleaning liquid flows out of the liquid container 32 through the supply line 28 , the filter devices 190 and after merging both sections 76 through the subsequent valve to the cleaning tool 24th .

To clean the filter, cleaning liquid can first be fed through the supply line 170 the downstream of the filter device 190 arranged section of the fluid line 28 are fed. Cleaning fluid flows through the outlet 122 and, in relation to normal operation, in the opposite direction through the filter element 128 . Adhesive dirt particles are loosened and collect at the bottom of the filter room 116 .

Following this, the valve is between the supply line 170 and the fluid line 28 closed, and the supply line 202 will be opened. Likewise, the flush line 198 open. Through the supply lines 170 and 202 liquid flows through to the inlet 118 and into the filter room 116 . The dirt particles collected in it are captured and through the flush outlet 194 and the flush line 198 dissipated and into the liquid container 32 rinsed. In this case, too, the ring flow of the cleaning liquid in the filter space proves to be 116 as advantageous, since the collected particles can be better captured and carried by the cleaning liquid in this way.

Reference symbol list

10th

Floor cleaning device

12

Scrubber drier

14

Floor area

16

landing gear

18th

Longitudinal / main direction of movement

20th

back

22

Control unit

24th

Cleaning tool

26

Plate brush

28

Fluid line

30th

Dirt pick-up device

32

Liquid container

34

Squeegee

36

Suction unit

38

Outlet

40

container

42

Supply line

44

Pump unit

46

casing

48

Bottom wall

50

Side wall

52

Container opening

54

edge

56

Housing part

58

Housing cover

60

Swivel axis

62

Suction line

64

Filter device

66

Sieve

68

Filter device

70

Cartridge filter

72

Pump unit

74

Filter device

76

section

78

admission

80

deepening

82

Filter housing

84

first housing part

86

second housing part

88

Housing pot

90

axis

92

Housing wall

94

Bottom wall

96

Side wall

98

Housing opening

100

thread

102

Housing cover

104

Housing wall

106

Ceiling wall

108

Side wall

110

thread

112

Twist grip

114

rib

116

Filter space

118

inlet

120

Connecting element

122

Outlet

124

Connecting element

126

Connecting element

128

Filter element

130

Cartridge filter

132

coat

134

inner space

136

End side

138

Cover element

140

End side

142

Cover element

144

Connecting element

146

Alignment element

148

Connecting device

150

Locking element

152

Locking element

154

edge

156

Alignment element

157

Space

158

Extension direction

160

Vent

162

Vent line

164

opening

166

section

168

Control device

170

Supply line

172

Bypass line

174

Exhaust pipe

180

Floor cleaning device

190

Filter device

192

Discharge element

194

Flush outlet

196

Connecting element

198

Flushing line

200

section

202

Supply line

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• WO 2015/106257 A1 [0003, 0006]

Claims (37)

Filter device for a floor cleaning device cleaning with filtered cleaning liquid, the filter device (74; 190) comprising a filter housing (82) with a first housing part (84) and a second housing part (86), which can be detachably connected to one another and a filter space (116) between them Define, the first housing part (84) having a housing opening (98) which can be closed with the second housing part (86), a filter element (128) arranged in the filter space (116) for filtering the cleaning fluid, an inlet opening into the filter space (116) 118) and an outlet (122) arranged on the filter housing (98), the filter element (128) being removable from the filter space (116) via the housing opening (98) and the inlet (118) and the outlet (122) being at a distance from Housing opening (98) on the second housing part (86) are arranged or formed. Filter device after Claim 1 , characterized in that the outlet (122) is arranged or formed on a housing wall (92) of the first housing part (84) opposite the housing opening (98), in particular a bottom wall (94) of the filter housing (82). Filter device after Claim 1 or 2nd , characterized in that a connection element (126) is arranged or formed at the outlet (122) and is connected in a fluid-tight manner to a corresponding connection element (144) of the filter element (128). Filter device according to one of the preceding claims, characterized in that the inlet (118) is arranged at a distance from a housing wall (92) of the first housing part (84) which lies opposite the housing opening (98). Filter device after Claim 4 , characterized in that the distance of the inlet (118) from the housing wall (92) is approximately 1/10 to approximately 2/3 of the extent of the first housing part (84) from the housing wall (92) to the housing opening (98), for example about 1/5 of the distance. Filter device according to one of the preceding claims, characterized in that a connection element (124) of the outlet (122) for a fluid line (28) projects axially from the first housing part (84). Filter device according to one of the preceding claims, characterized in that a connecting element (120) of the inlet (118) for a fluid line (28) projects radially or tangentially from the first housing part (84). Filter device according to one of the preceding claims, characterized in that the first housing part (84) is a cup-shaped housing part (84) and / or that the second housing part (86) is a housing cover (102). Filter device according to one of the preceding claims, characterized in that the housing parts (84, 86) are detachably engaged with one another by force and / or positive locking. Filter device according to one of the preceding claims, characterized in that the second housing part (86) can be connected to the first housing part (84) by screwing, in particular that the second housing part (86) comprises or forms a rotary handle (112). Filter device after Claim 10 , characterized by an external thread (100) on the first housing part (84) and an internal thread (110) on the second housing part (86) or vice versa. Filter device according to one of the preceding claims, characterized in that the filter housing (82), in particular the first housing part (84), is cylindrical or essentially cylindrical. Filter device according to one of the preceding claims, characterized in that the filter element (128) is designed as a permanent filter element or as a removable filter element. Filter device according to one of the preceding claims, characterized by a suitability of the filter element (128) to retain particles larger than approx. 300 µm to 50 µm, for example larger than approx. 100 µm. Filter device according to one of the preceding claims, characterized in that the filter housing (82) comprises or forms a diverting element (192) for cleaning fluid flowing into the filter space (116) through the inlet (118), which passes through the diverting element (192) into a Ring flow in the filter chamber (116) is offset. Filter device according to one of the preceding claims, characterized in that the filter housing (82) comprises a flushing outlet (194) via which the filter chamber (116) can be brought into flow connection with a flushing line (198) which can be connected to it. Filter device after Claim 16 , characterized in that the flushing outlet (194) is arranged or formed on the first housing part (84). Filter device after Claim 16 or 17th , characterized in that the flushing outlet (194) is arranged on a bottom wall (94) of the filter housing (82) and / or that the flushing outlet (194) projects tangentially from a housing wall (92) of the filter housing (82). Filter device according to one of the Claims 16 to 18th , characterized in that the flushing outlet (194) is arranged laterally next to the outlet (122). Filter device according to one of the Claims 16 to 19th , characterized in that the flushing outlet (194) is arranged below the inlet (118). Filter device according to one of the preceding claims, characterized in that a ventilation opening (160) for connecting a ventilation line (162) is arranged on the filter housing (82), in particular on the first housing part (84), in particular that the ventilation opening (160) has a smaller distance to the housing opening (98) as the inlet (118) and the outlet (122). Filter device according to one of the preceding claims, characterized in that the second housing part (86) comprises a connecting device (148) on which the filter element (128) can be releasably fixed, in particular for inserting the filter element (128) into the filter space (116) and / or removing the filter element (128) from the filter space (116) via the second housing part (86). Filter device according to one of the preceding claims, characterized in that the second housing part (86) comprises or forms at least one support element or one is arranged on the second housing part (86), the filter element (128) being located on opposite sides of the at least one support element and is supported on the outlet (122). Filter device according to one of the preceding claims, characterized in that the filter element (128) is arranged in a form-fitting manner in the filter space (116) between the second housing part (86) and the outlet (122). Floor cleaning device comprising a cleaning tool (24) for cleaning a floor surface (14), a liquid container (32) which is connected to the cleaning tool (24) via a fluid line (28), and at least one filter device (74; 190) according to one of the preceding claims, which is connected in the fluid line (28). Floor cleaning device after Claim 25 , characterized in that the at least one filter device (74; 190) is aligned in a height direction, with the second housing part (86) on the top, on the floor cleaning device (10; 180), in particular that the at least one filter device (74) is arranged vertically or is oriented substantially vertically. Floor cleaning device after Claim 25 or 26 , characterized in that the floor cleaning device (10; 180) comprises a housing (46) in which the liquid container (32) is arranged or from which housing (46) the liquid container (32) is formed, and that the housing (46) at least comprises or forms a receptacle (78) for the at least one filter device (74; 190). Floor cleaning device after Claim 27 characterized in that the housing (46) comprises a movable housing part (56) which can be converted from a closed position into an open position, the at least one receptacle (78) covering the housing part (56) occupying the closed position and the at least one filter device ( 74; 190) is freely accessible in the open position of the housing part (56). Floor cleaning device after Claim 28 , characterized in that the housing part (56) is a housing cover (58) which closes the liquid container (32) in the closed position and opens an opening (52) of the liquid container (32) in the open position. Floor cleaning device according to one of the Claims 25 to 29 , characterized in that the at least one filter device (74; 190), in particular in the at least one receptacle (78), is arranged laterally next to the liquid container (32). Floor cleaning device according to one of the Claims 25 to 30th , characterized in that the liquid container (32) comprises a container wall (48, 50), in particular formed by a housing (46) of the floor cleaning device (10; 180), and that the first housing part (84) is at least partially in one piece with the container wall (48, 50) is formed. Floor cleaning device according to one of the Claims 25 to 31 , characterized in that the floor cleaning device (10; 180) comprises two or more filter devices (74; 190), which are preferably connected in branching and recombining sections (76) of the fluid line (28). Floor cleaning device according to one of the Claims 25 to 32 , characterized in that the floor cleaning device (10; 180) comprises at least one supply line (170, 202) which opens into the fluid line (28) on the upstream side of the at least one filter device (74; 190). Floor cleaning device according to one of the Claims 25 to 33 , characterized in that the floor cleaning device (10; 180) comprises at least one flushing line (198) which is connected to the flushing outlet (194) and opens into the liquid container (32). Floor cleaning device according to one of the Claims 25 to 34 combined with Claim 21 , characterized in that the floor cleaning device (10; 180) comprises at least one ventilation line (162) which is connected to the ventilation opening (160) and opens into the liquid container (32). Floor cleaning device according to one of the Claims 25 to 35 , characterized in that the floor cleaning device (10; 180) comprises a dirt pick-up device (30), via which the dirty liquid picked up by the bottom surface (14) can be transferred into the liquid container (32). Floor cleaning device according to one of the Claims 25 to 36 , characterized in that a further filter device (68) is preferably arranged at an outlet (38) of the liquid container (32) with a coarser filtering property than the at least one filter device (74; 190).

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