Surface cleaning device, filter unit for a surface cleaning device, kit for forming a filter unit, additive unit for a surface cleaning device, and surface cleaning system

Abstract

The invention relates to a filter device for a surface cleaning device, comprising at least one filter unit configured for placement in a fluid path of the surface cleaning device and for filtering a liquid flowing along the fluid path. The invention further relates to an additive device for a surface cleaning device, a kit for forming a filter device, a fluid tank with a filter device and / or an additive device, as well as a surface cleaning device and a surface cleaning system.

Description

[0001] The invention relates to improvements in the field of wet cleaning of surfaces, in particular floor surfaces, for example floor surfaces in buildings.

[0002] In particular, the invention relates to a surface cleaning device for wet cleaning a surface, a filter device for a surface cleaning device, a kit for forming a filter device, an additive device for a surface cleaning device and a surface cleaning system.

[0003] From DE 10 2013 215 198 A1, a surface cleaning device is known, comprising a guide section, a base section, a tool assembly, a fluid dispensing unit, and a fluid intake. The known surface cleaning device is designed for wet cleaning of floor surfaces and functions as a scrubber-dryer. The known surface cleaning device has a fresh water tank, which is fluid-conductingly connected to the fluid dispensing unit, and a dirty water tank, which is connected to the fluid intake. The fresh water tank and the dirty water tank, and thus also the fluid dispensing unit and the fluid intake, are fluidically separated from each other. During wet cleaning with the known surface cleaning device, fresh water is dispensed from the fresh water tank onto the surface to be cleaned via the fluid dispensing unit, and the moistened surface is then worked by means of the tool assembly to loosen dirt.The dispensed liquid, mixed with the dissolved dirt, is collected by the fluid intake, stored in the wastewater tank, and disposed of after wet cleaning. The separate fluid tanks of this type of surface cleaning device naturally have a limited capacity. When the fresh water supply is exhausted, the wet cleaning process must be interrupted to refill the fresh water tank. Similarly, when the wastewater tank is full, the wet cleaning process must be interrupted to empty the wastewater tank. If an additive is used in the fresh water, it is drawn into the wastewater tank and disposed of, even though the additive's effectiveness is often not yet exhausted.

[0004] An unpublished German patent application 10 2024 103 715.6 by the inventor in question relates to a surface cleaning device that overcomes the aforementioned disadvantages. This surface cleaning device has a fluid path extending between a fluid outlet and a fluid intake. Liquid is conveyed along this fluid path by means of a conveying device. The fluid path connects the fluid intake to the fluid outlet via a fluid-conducting mechanism for the return of the liquid absorbed by the fluid intake. This allows liquid absorbed from the surface to be (re)dispensed onto the surface via the fluid outlet. In other words, the fluid path forms a closed loop. The invention described in German patent application 10 2024 103 715.6 is based on the understanding that wet cleaning of surfaces does not necessarily require fresh water.Even soiled liquid or liquid previously used for wet cleaning can be reused, repeated and / or recirculated without practically impairing the cleaning result or even with an improved cleaning result.

[0005] The object of the invention is to enable improved wet cleaning of surfaces. Specifically, it aims to enable improved wet cleaning of floor surfaces, particularly floors in buildings. Furthermore, it seeks to achieve advantages over the surface cleaning device described in German patent application 10 2024 103 715.6.

[0006] This problem is solved by providing a filter device with the features of claim 1, a kit with the features of claim 25, an additive device with the features of claim 28, a surface cleaning device with the features of claim 36, and a surface cleaning system with the features of claim 39. Advantageous embodiments are specified in the dependent claims. The wording of the claims is incorporated herein by reference.

[0007] The filter device according to the invention is designed for a surface cleaning device and comprises at least one filter unit, which is configured for placement in a fluid path of the surface cleaning device and for filtering a liquid flowing along the fluid path. The filter device, and in particular the at least one filter unit, filters dirt out of the liquid flowing along the fluid path. This prevents excessive accumulation of dirt in the fluid path and / or the liquid. Filtering reduces the degree of contamination of the collected liquid, for example, by removing undissolved and / or dissolved dirt particles, small parts, lint, hair, or the like from the liquid. This is particularly advantageous when the liquid is applied to and collected from the surface to be cleaned in a closed loop.Filtering by the filter device allows the available quantity of liquid to be used for longer cleaning times and / or larger cleaning areas without compromising the cleaning result. Furthermore, a larger quantity of liquid per unit of time can be used without reducing cleaning time and / or cleaning area, which also results in improved cleaning performance. The at least one filter unit can, in principle, have any design suitable for the intended purpose. It is understood that the filter device can have several identical and / or different filter units arranged at one or more points along the path, particularly between a fluid intake and a fluid discharge point of the surface cleaning device.In one embodiment, the at least one filter unit is a consumable item that must be replaced after reaching a predetermined level of use, for example, a maximum service life. In another embodiment, the at least one filter unit is designed to be used throughout the entire service life of the surface cleaning device and is therefore not such a consumable item. Preferably, the at least one filter unit is washable, cleanable, and / or biodegradable.

[0008] The filter device according to the invention is particularly advantageous for hand-held surface cleaning devices with a fluid circulation system. However, the filter device according to the invention is not limited to use in such surface cleaning devices. The filter device according to the invention can also be advantageously used for surface cleaning devices or surface cleaning systems that provide for non-handheld, autonomous movement across the surface to be cleaned or even for completely autonomous cleaning.

[0009] In one embodiment of the invention, the at least one filter unit comprises at least one rigid filter medium. In this embodiment, the filter medium is therefore dimensionally stable. In other words, the filter medium exhibits a comparatively high stiffness and / or inherent strength. The rigid filter medium can be made, for example, of metal, plastic, paper, and / or ceramic. The rigid filter medium can be designed in a wide variety of filter forms, such as a screen filter, pore filter, and / or filter cartridge.

[0010] In a further embodiment of the invention, the at least one filter unit comprises at least one conformable filter medium. The conformable filter medium can be made, for example, of metal, plastic, paper, and / or ceramic. The conformable filter medium can be designed in various filter forms, for example, as a paper filter, a woven filter, and / or a nonwoven filter.

[0011] In a further embodiment of the invention, the at least one filter unit comprises at least one loose filter medium. The loose filter medium is a loose composite material consisting of a granular, granular, or otherwise loosely present material, specifically a sand filter, gravel filter, or the like. For example, metal, plastic, and / or ceramic can be used as the material for the loose filter medium. In one embodiment, the loose filter medium forms a packed bed filter.

[0012] It is understood that at least one filter unit can contain several identical and / or different filter media. Furthermore, it is understood that several different filter units, each with a different filter medium, can be present.

[0013] In a further embodiment of the invention, the at least one filter unit comprises a sieve filter, a pore filter, and / or a filter cartridge. The aforementioned filter designs preferably have a rigid filter medium and / or are formed from a rigid filter medium.

[0014] In a further embodiment of the invention, the at least one filter unit comprises a paper filter, a fabric filter, and / or a nonwoven filter. The aforementioned filter designs preferably have a conformable filter medium and / or are formed from a conformable filter medium.

[0015] In a further embodiment of the invention, at least one filter unit comprises a packed bed filter formed from a granular material. The packed bed filter functions as a loose filter medium. In one embodiment, the packed bed filter is a sand filter, a gravel filter, or the like.

[0016] In a further embodiment of the invention, the at least one filter unit comprises a wire mesh filter formed from wire mesh, in particular wherein the wire mesh is a filter weave or a mesh fabric. Preferably, the wire mesh filter is made of metal, specifically stainless steel. The wire mesh is a sheet structure with uniform openings in a preferably regular arrangement, produced, for example, by interlacing warp and weft wires. In one embodiment, the wire mesh is a mesh fabric, for example, in plain weave, twill weave, satin weave, or the like. In a preferred embodiment, the wire mesh is a filter weave. In filter weave fabrics, either the warp wires or the weft wires are so closely spaced that no open meshes remain. In one embodiment, the filter weave is a smooth weave.In a particularly preferred embodiment, the filter webbing is a reinforced webbing. By designing it as a reinforced webbing, improved stability and / or tear resistance of the wire mesh filter can be achieved.

[0017] In a further embodiment of the invention, at least one filter unit is made of metal, plastic, paper and / or ceramic. It is understood that combinations of the aforementioned materials are also possible.

[0018] In a further embodiment of the invention, the opening size of the at least one filter unit is between 1 µm and 50 µm, preferably between 5 µm and 30 µm, and particularly preferably between 10 µm and 20 µm. The opening size can also be referred to as pore size and / or mesh size. The opening size is a property of the filter unit, specifically of the filter medium and / or filter media used. It has been shown that the aforementioned value ranges offer particular advantages for use in the surface cleaning devices with liquid circulation. An opening size between 10 µm and 20 µm has proven to be particularly advantageous. In principle, a distinction can be made between opening sizes for macrofiltration, microfiltration, ultrafiltration, and nanofiltration.

[0019] In a further embodiment of the invention, the filter device comprises at least one support structure on which the at least one filter unit is held. The at least one support structure acts as a carrier, holder, and / or support for the at least one filter unit. If the filter device comprises several different and / or identical filter units, these are, in one embodiment, jointly held on one or more of the support structures. In a further embodiment, the filter device comprises several support structures, each of which holds one of the multiple filter units. The support structure is particularly advantageous when a flexible and / or loose filter medium is used. In one embodiment, the support structure is designed to be attached and / or fastened at a designated location in the fluid path of the surface cleaning device.Preferably, the support structure is designed to be arranged in a fluid tank through which the fluid path extends in sections. In one embodiment, the at least one filter unit is permanently connected to the support structure. In another embodiment, the at least one filter unit is detachably connected to the support structure. In the latter case, the filter unit can be detached from the support structure, for example, for replacement, cleaning, or the like. The support structure can, in principle, have any design suitable for the intended purpose. The support structure is preferably dimensionally stable. In one embodiment, the support structure, together with the permanently connected filter unit, forms a consumable item that is disposed of and replaced after reaching a predetermined level of use, for example, a maximum service life.

[0020] In a further embodiment of the invention, the filter device includes a filter cleaning device designed to clean the at least one filter unit. The filter cleaning device allows the at least one filter unit to be cleaned before, during, and / or after operation of the surface cleaning device. The filter cleaning device removes filtered dirt from the at least one filter unit, thus preventing clogging. The filter cleaning device can, in principle, have any design suitable for the present purpose. For example, cleaning can be carried out by wiping a surface of the at least one filter unit. Alternatively or additionally, the at least one filter unit and / or the at least one wiping element can be vibrated. Alternatively or additionally, the at least one filter unit can be backwashed.In one embodiment, the filter cleaning device is designed for manual operation by a user of the surface cleaning device. The user may operate the filter cleaning device as needed. This operation can take place before, during, and / or after operation of the surface cleaning device. In a further embodiment of the invention, the filter cleaning device is designed for self-cleaning and / or automatic cleaning of the at least one filter unit, particularly depending on the degree of contamination of the liquid. The degree of contamination can be detected, for example, by a detection device, specifically by means of a sensor.

[0021] In a further embodiment of the invention, the filter cleaning device includes a scraper assembly designed to wipe a surface of at least one filter unit. The scraper assembly allows the surface to be wiped to remove dirt.

[0022] In a further embodiment of the invention, the scraping device comprises at least one scraping element and a movement mechanism, wherein the scraping element and the at least one filter unit are movable relative to each other, and wherein the movement mechanism is configured to move the scraping element and / or the filter unit. In one embodiment, the at least one scraping element is rotatably movable relative to the at least one filter unit, in particular its surface. Alternatively or additionally, the at least one scraping element can be translationally movable. Dirt can be scraped from the filter unit by the movable scraping element. In another embodiment, the at least one filter unit is rotatably movable relative to the at least one scraping element. Alternatively or additionally, the at least one filter unit can be translationally movable.The relative movement between the scraper element and the filter unit allows dirt to be scraped off the filter unit. The movement mechanism serves to move at least one scraper element and / or at least one filter unit and can, in principle, have any design suitable for the intended purpose.

[0023] In a further embodiment of the invention, the movement mechanism is configured for manual operation by a user. This eliminates the need for a separate drive to power the movement of the scraper element. In one embodiment, the movement mechanism is a rotary mechanism for transmitting a rotary motion and / or torque applied by the user to the at least one scraper element. In another embodiment, the movement mechanism is a translational mechanism for transmitting a translational tensile and / or compressive movement generated by the user to the at least one scraper element.

[0024] In a further embodiment, the at least one scraper element serves as a positioning aid for inserting and / or replacing the at least one filter unit. In one embodiment, the at least one scraper element forms a section of any support structure.

[0025] In a further embodiment of the invention, the movement mechanism is driven by a drive motor and / or the flowing fluid. This eliminates the need for manual operation of the movement mechanism. The motor-driven and / or fluidic drive of the movement mechanism enables simple and continuous cleaning of the at least one filter unit, particularly during operation of the surface cleaning device.

[0026] In a further embodiment of the invention, the filter cleaning device includes a vibration device configured to vibrate the at least one filter unit. Alternatively or additionally, the vibration device is configured to vibrate the liquid to be filtered, particularly at least in the area of ​​the at least one filter unit. The vibrations generated by the vibration device shake off or vibrate away dirt adhering to and / or within the filter unit. In one embodiment of the invention, the vibration device acts directly on the at least one filter unit. In another embodiment, the vibration device acts indirectly on the at least one filter unit, for example, via a transmission element and / or the liquid to be filtered. In one embodiment, the vibration device is configured to generate vibrations.

[0027] Alternatively or additionally, the vibration device can be configured to generate sound, specifically ultrasound. In one embodiment, the vibration device is configured to generate movement. In one embodiment of the invention, the vibration device acts on the filter unit via the support structure. To enable sufficient vibration of the filter unit and / or to prevent unwanted vibration transmission to adjacent components, the filter unit is preferably elastically mounted on a section of the fluid path of the surface cleaning device provided for this purpose, for example, by an elastic retaining element. If the filter device has a support structure for holding the at least one filter unit, the support structure is preferably elastically mounted accordingly.

[0028] In a further embodiment of the invention, the vibration device is configured to set the scraper device, in particular the at least one scraper element, into vibration. This allows for advantages that go beyond a combined benefit of the vibration device on the one hand and the scraper device on the other. It is also possible to set the scraper device and / or the scraper elements and the filter device and / or the filter unit into vibration. In one embodiment, the vibration device is configured to subject different components to different vibrations. The different components are, for example, the at least one scraper element, the at least one filter unit, and / or the support structure. The different vibrations preferably differ with respect to their respective frequency and amplitude.

[0029] In a further embodiment of the invention, the vibration device is configured to generate a sweep and / or chirp. In this embodiment, the frequency of the generated vibration is variable and, preferably periodically, continuously increases and / or decreases through a defined frequency range, preferably with a constant amplitude. This allows for further improved dirt removal.

[0030] In a further embodiment of the invention, the frequency range of the generated oscillations extends from 20 Hz to 5 kHz, preferably to 10 kHz, more preferably to 20 kHz, more preferably to 40 kHz, more preferably to 100 kHz, more preferably to 250 kHz, more preferably to 500 kHz.

[0031] In a further embodiment of the invention, the vibration device is configured to generate the vibration in a pulsed manner. This pulsed generation results in the vibrations being produced in bursts. This allows for a further improvement in dirt removal.

[0032] In a further embodiment of the invention, the vibration device is configured to generate at least one signal, indicator, and / or warning tone. In one embodiment, the vibration device is configured to generate the signal, indicator, and / or warning tone as a sequence of tones, in particular as a melody and / or jingle. The signal, indicator, and / or warning tone is audibly perceptible to a user of the surface cleaning device and / or the surface cleaning system. The signal tone has a signaling function. The indicator tone has an indicator function. The warning tone has a warning function.The vibration device is preferably configured to generate at least one signal, indicator, and / or warning tone depending on at least one control parameter, for example, by controlling the vibration device via a control unit, which may preferably be a central control unit of the surface cleaning device and / or the surface cleaning system. The said at least one control parameter may, in particular, be a degree of contamination of the liquid, a fill level of the liquid, an operating time of the filter device, specifically the filter unit, switching on and / or off of the surface cleaning device and / or the surface cleaning system, a fill level of the at least one additive, or the like. In one embodiment, different signal, indicator, and / or warning tones are generated depending on different control parameters.

[0033] In a further embodiment of the invention, the vibration device comprises a vibration motor that is operatively connected to the at least one filter unit. The vibration motor serves to generate vibrations. These vibrations cause the at least one filter unit to vibrate, thereby loosening any dirt that is attached to or embedded within the filter. The vibrations shake off the dirt. If the filter device has a support structure to which the at least one filter unit is attached, the vibration motor preferably acts on the support structure and / or is mounted on the support structure.

[0034] In a further embodiment of the invention, the vibration device includes an ultrasonic transducer configured to generate ultrasound. In one embodiment, the ultrasound is transmitted directly to the at least one filter unit. In another embodiment, transmission is indirect, for example via a support structure and / or the liquid to be filtered. The ultrasound generated by the ultrasonic transducer prevents dirt accumulation and loosens dirt already accumulated on and / or in the at least one filter unit.

[0035] In a further embodiment of the invention, the filter cleaning device includes a backwashing device configured for backwashing the at least one filter unit. Backwashing allows dirt accumulated on and / or in the at least one filter unit to be flushed out. This flushing occurs against the usual flow direction of the liquid along the fluid path and / or through the at least one filter unit. Backwashing using the backwashing device can be performed before, during, and / or after operation of the surface cleaning device. In one embodiment of the invention, the backwashing device includes a separate pumping device by which the liquid can be pumped for backwashing. In one embodiment, this pumping device is a pressure source. Alternatively or additionally, a suction source may be provided.In a further embodiment of the invention, the backwashing device includes an actuating element by means of which the flow direction of the liquid in the area of ​​the at least one filter unit can be influenced, in particular reversed. In one embodiment of the invention, the backwashing device is configured for actuation by a user of the surface cleaning device. In a further embodiment, the backwashing device is configured for self-acting and / or automatic backwashing.

[0036] In one embodiment, a backwash device is combined with a scraper device and / or a vibration device. The advantages achieved thereby go beyond a mere combination of the advantages of the individual devices.

[0037] In a further embodiment of the invention, the filter device comprises at least one additive designed to be released into the liquid flowing along the fluid path. This at least one additive can also be referred to as an additive substance, admixture, and / or additive. The at least one additive is designed to exert an effect that, in the broadest sense, supports improved surface cleaning and / or the function of the surface cleaning device. The at least one additive can be in solid, liquid, and / or gaseous form. In other words, in one embodiment, the additive is a solid, for example, in tablet, pad, and / or powder form. In another embodiment, the at least one additive is a liquid, a gel, or the like. It is understood that the filter device can also comprise several similar and / or different additives.Preferably, the at least one additive is associated with the at least one filter unit, for example by arranging the at least one additive on and / or in the at least one filter unit. Alternatively or additionally, the at least one additive can be soluble in the at least one filter unit.

[0038] In a further embodiment of the invention, the at least one additive has a cleaning, disinfecting, descaling, coloring, deodorizing, and / or clarifying effect. In other words, in this embodiment, the at least one additive is a cleaning agent, disinfectant, descaling agent, coloring agent, deodorizing agent, and / or clarifying agent. The cleaning agent allows for improved surface cleaning. The disinfectant serves to disinfect the surface and / or the liquid-carrying components of the surface cleaning device and the filter assembly, as well as the liquid itself. The descaling agent serves to descale the liquid and prevents limescale deposits on the filter assembly and the surface cleaning device. The coloring agent serves to mark and color already cleaned sections of the surface and the liquid itself.The deodorizing agent counteracts unwanted odor formation, especially during extended periods of non-use of the surface cleaning device. The clarifying agent promotes the flocculation of water-soluble dirt particles and can enhance the effectiveness of the filter system.

[0039] In a further embodiment of the invention, the at least one additive is soluble in an additive body which is associated with the at least one filter unit. Preferably, the additive body is a capsule, a tablet, a cushion, or the like. In one embodiment, the additive body is arranged on a section of the filter unit provided for this purpose. For example, the filter unit can have a receiving recess into which the additive body is received or can be received. Furthermore, by way of example, the filter unit can consist of several identical or different filters or filter media, for example in different layers or strata, and the additive body can be formed as a layer or strata or be received in a layer or strata.In this example, the additive body can be expediently located in the first or uppermost layer of the filter unit, or in the last or lowest layer, or between these, depending on the specific function of the additive. It is also conceivable and possible to arrange several additive bodies within the filter unit, for example, in the first and last layers, or in an intermediate layer. The additive is soluble, particularly liquid-soluble and specifically water-soluble, and bound within the additive body. The additive can be dissolved from the additive body by the fluid flowing along the fluid path and released into the fluid to exert its corresponding effect. The additive body is designed to dissolve, preferably completely, under the influence of the flowing fluid.

[0040] In a further embodiment of the invention, the at least one additive is soluble in the at least one filter unit. During operation of the filter device, the additive is dissolved from the filter unit by the liquid flowing through it and released into the liquid. The additive is liquid-soluble, specifically water-soluble, and bound in the filter unit. In one embodiment, the additive is formed as a coating, layer, and / or layer. Alternatively or additionally, the at least one filter unit can be impregnated, saturated, or otherwise equipped with the additive. In this embodiment of the invention, the at least one filter unit has a particularly advantageous multiple function. On the one hand, the filter unit serves to filter the liquid used for surface cleaning. On the other hand, the filter unit simultaneously serves to release the additive into the liquid.

[0041] The invention further relates to a kit for constructing a filter device according to the preceding description. The kit according to the invention comprises at least one filter unit and at least one additive body in which at least one additive is soluble. The kit can also be referred to as a set and / or assembly kit. The kit is intended for use with a surface cleaning device, wherein a user can attach the at least one filter unit and the at least one additive body, preferably together, to a designated location in the liquid path of the surface cleaning device.

[0042] In a further embodiment of the invention, the kit comprises several different and / or identical filter units. These multiple different and / or identical filter units allow for a tailored selection depending on the cleaning task to be performed. The different filter units can vary, in particular, with regard to their design, aperture size, and other properties.

[0043] In a further embodiment of the invention, the kit comprises several different and / or similar additive bodies. The different additive bodies allow for a tailored selection depending on the specific cleaning task to be performed. In one embodiment, the different additive bodies differ with regard to the effect of the respective additive and / or its dosage.

[0044] In a further embodiment of the invention, the kit comprises several different and / or similar filter units together with different and / or similar additive bodies, which may be provided, integrated, included, enclosed, or pre-assembled in the filter units, or the different and / or similar filter units are equipped with a different and / or similar additive, in particular impregnated and / or soaked.

[0045] The additive device according to the invention for a surface cleaning device comprises at least one additive designed for dispensing into a fluid path of the surface cleaning device. The at least one additive can also be referred to as an additive substance, additive, and / or additive. The at least one additive is designed to exert an effect that, in the broadest sense, supports improved surface cleaning and / or improved function of the surface cleaning device. The at least one additive can be in solid, liquid, and / or gaseous form. In other words, in one embodiment, the additive is a solid, for example, in tablet, pad, and / or powder form. In another embodiment, the at least one additive is a liquid, a gel, or the like. It is understood that the additive device can also comprise several similar and / or different additives.Preferably, the at least one additive has a cleaning, disinfecting, descaling, coloring, deodorizing, and / or clarifying effect. In other words, the at least one additive is preferably a cleaning agent, disinfectant, descaling agent, coloring agent, deodorizing agent, and / or clarifying agent. The cleaning agent allows for improved surface cleaning. The disinfectant serves to disinfect the surface and / or the liquid-carrying components of the surface cleaning device, as well as the liquid itself. The descaling agent serves to descale the liquid and prevents limescale deposits on the surface cleaning device and the surface to be cleaned. The coloring agent serves to mark and color already cleaned sections of the surface, as well as the liquid itself. The deodorizing agent counteracts unwanted odor formation, especially during prolonged periods of non-use of the surface cleaning device.The clarifying agent helps to flocculate water-soluble dirt particles and can support the effect of any filter system of the surface cleaning device.

[0046] The additive device according to the invention is particularly advantageous for hand-held surface cleaning devices with a liquid circuit, as described in the applicant's unpublished German patent application discussed at the outset. However, the additive device according to the invention is not limited to use in such surface cleaning devices.

[0047] In a further embodiment of the invention, the additive device comprises at least one additive container in which the at least one additive is stored. Depending on the properties of the at least one additive, the at least one additive container has properties adapted accordingly, for example, depending on whether the at least one additive is liquid, solid, and / or gaseous. In one embodiment, the additive container is fluid-tight. In another embodiment, the additive container is open in the broadest sense and primarily allows for the storage of one or more additives in solid form. If the additive device comprises several different additives, these are each contained in a separate additive container in one embodiment, so that the additive device in said embodiment comprises several additive containers.In a further embodiment, the additive device includes an additive container designed to hold several, preferably different, additives. In different embodiments, the at least one additive container is attached to, or can be attached to, different components of the surface cleaning device. In one embodiment, the at least one additive container is attached to a fluid tank of the surface cleaning device. In another embodiment, the additive container is attached to a guide element of the surface cleaning device. Alternatively or additionally, the at least one additive container can be attached to a base element of the surface cleaning device.In a further embodiment, at least one additional agent container is attached to and / or attachable to a robotic device that can be detachably connected to the surface cleaning device in order to enable autonomous movement of the surface cleaning device across the surface.

[0048] In a further embodiment of the invention, the additive device includes a dispensing device configured to dispense the at least one additive into the fluid path. In one embodiment, the dispensing device is configured for manual dispensing of the additive, for example, by means of manual actuation of an actuator by a user of the surface cleaning device. In another embodiment, the dispensing device is configured for automatic and / or automatic dispensing of the at least one additive, for example, via a drive motor, a motion mechanism, or the like. Preferably, the dispensing device is configured for metered dispensing of the at least one additive. In this embodiment, it can also be referred to as a dispensing and metering device.In a preferred embodiment, the dispensing device is configured for the automatic dispensing and dosing of the at least one additive, for example, depending on the degree of soiling of the liquid. The degree of soiling can be detected, for example, by a sensor in the dispensing device. Alternatively or additionally, the degree of soiling can be detected by a detection device in the surface cleaning device. If the additive device has an additive container, the dispensing device is preferably configured to dispense the at least one additive from the additive container.

[0049] The invention also relates to a fluid tank for a surface cleaning device. The fluid tank according to the invention has at least one tank inlet, one tank outlet, a tank volume, and a filter device as described above. Alternatively or additionally to the filter device, the fluid tank according to the invention has an additive device as described above. The liquid used for surface cleaning is contained in the tank volume. The fluid path of the surface cleaning device extends section by section through the fluid tank, starting from the tank inlet, through the tank volume, and ending at the tank outlet.

[0050] In a further embodiment of the invention, the filter device is arranged within the tank volume. Specifically, the at least one filter unit is arranged within the tank volume. In principle, the filter device, and in particular the at least one filter unit, can be arranged at one or more locations within the fluid tank. In one embodiment, the at least one filter unit is arranged, in particular, directly downstream of the tank inlet within the tank volume. Preferably, the at least one filter unit is arranged upstream of a liquid level within the fluid tank. Such an arrangement of the at least one filter unit separates dirt from the liquid before it can mix with the liquid level within the fluid tank. In a further embodiment, the at least one filter unit is arranged, in particular, directly upstream of the tank outlet within the tank volume.

[0051] In a further embodiment of the invention, the filter assembly can be removed from the tank volume through the tank inlet and / or the tank outlet and / or a closable tank opening. Because the filter assembly, and in particular the at least one filter unit, is removable from the tank volume, it can be cleaned, maintained, and / or replaced particularly easily. It is understood that the filter assembly, and in particular the at least one filter unit, can not only be removed from the tank volume in the manner described above, but can also be inserted into the tank volume.

[0052] In a further embodiment of the invention, the fluid tank has a tank lid for opening and closing the tank opening, with the filter assembly being detachably attached to the tank lid. Specifically, the at least one filter unit of the filter assembly is detachably attached to the tank lid. Due to the aforementioned attachment of the filter assembly, and in particular the at least one filter unit, it can be removed from and inserted into the tank volume in a particularly simple manner. This further simplifies cleaning, maintenance, and / or replacement of the filter unit.

[0053] In a further embodiment of the invention, the additive device is arranged on the fluid tank and / or within the tank volume. This offers several advantages. For example, the at least one additive can be dispensed into the fluid path, and thus into the liquid used for surface cleaning, in a simplified manner by arranging the additive device on the fluid tank and / or within the tank volume. If the additive device includes an additive reservoir, this is preferably arranged on the fluid tank and / or within the tank volume. If the additive device includes a dispensing device, this is preferably arranged on the fluid tank and / or within the tank volume.

[0054] The surface cleaning device according to the invention is designed for wet cleaning a surface and has at least one fluid path along which a liquid used for wet cleaning of the surface flows. The surface cleaning device according to the invention also has at least one filter device as described above. Alternatively or additionally to the at least one filter device, the surface cleaning device according to the invention has at least one additive device as described above. Alternatively or additionally to one or both of the aforementioned devices, the surface cleaning device according to the invention has at least one fluid tank as described above. The fluid path extends at least partially through said fluid tank. The filter device is arranged in the fluid path.In one embodiment of the invention, the surface cleaning device is a handheld device that is moved across the surface to be cleaned by a user during operation. In a further embodiment of the invention, the surface cleaning device is designed for autonomous movement across the surface to be cleaned, so that it can also be referred to as a surface cleaning robot.

[0055] In a further embodiment of the invention, the surface cleaning device comprises at least one tool assembly, a fluid dispensing unit, a fluid intake unit, and a conveying unit. The tool assembly is configured to act on the surface. The fluid dispensing unit is configured to dispense liquid onto the surface. The fluid intake unit is configured to receive liquid from the surface that has been dispensed onto the surface by means of the fluid dispensing unit. The conveying unit is configured to convey fluid along the fluid path. The fluid path connects the fluid intake unit to the fluid dispensing unit for the return of liquid received by means of the fluid intake unit. In this embodiment, liquid received from the surface by means of the fluid intake unit can therefore be (re)dispensed onto the surface by means of the fluid dispensing unit. In other words, the fluid path forms a fluid circuit.This design of the surface cleaning device is based on the understanding that wet cleaning of surfaces does not necessarily require fresh liquid, especially fresh water. Even soiled liquid or liquid previously used for wet cleaning (dirty water) can be reused and / or reused repeatedly without practically impairing the cleaning result, or even with improved results. Nevertheless, advantages can be achieved through the optional filter system. This system allows the available quantity of liquid to be used for longer cleaning times and / or larger cleaning areas without compromising the cleaning result. Furthermore, a larger quantity of liquid can be used per unit of time without reducing cleaning time or the area being cleaned. Additional advantages are also available through the optional additive system.For example, at least one additive in the additive assembly can contribute to improved cleaning and / or improved function of the surface cleaning device by exerting the aforementioned individual or combined effects, in particular to improved function of the optional filter assembly. The tool assembly is designed to act on the surface to be cleaned and / or to loosen dirt from the surface to be cleaned. The tool assembly is preferably designed to act mechanically on the surface so that the dirt is loosened mechanically, in particular abrasively. In a preferred embodiment, the tool assembly is a scouring device or a scrubbing device. In embodiments with a base section, the tool assembly is preferably arranged on the base section.In wet cleaning, the tool assembly rests on or against the surface, at least in sections. The fluid discharge and fluid intake are fluid-conductingly connected via the fluid path. A conveying device is provided for pumping the fluid along the fluid path. The discharged fluid binds and / or dissolves dirt present on the surface. It is understood that the fluid intake is not only designed to receive clean fluid, but also dirt bound and / or dissolved in the fluid. The fluid discharge can also be referred to as liquid discharge. The fluid intake can also be referred to as liquid intake. The fluid path can also be referred to as liquid path. The conveying device can, in principle, be designed in any way suitable for the intended purpose, for example, as a vane, piston, diaphragm, and / or peristaltic pump.In one configuration, the fluid is conveyed by means of an overpressure generated by the conveying device. In another configuration, the conveying device generates a vacuum for conveying purposes. Alternatively or additionally, the conveying device can be configured for gravity-driven conveying of the fluid along the fluid path.

[0056] In a further embodiment of the invention, the surface cleaning device comprises a guide section and a base section. The guide section extends longitudinally between a proximal end and a distal end and is designed for manually guiding the surface cleaning device across the surface. The base section is connected to the distal end of the guide section. The tool assembly, fluid dispensing, and / or fluid intake are arranged at least partially on the base section. The guide section can also be referred to as the hand guide section. When the surface cleaning device is used as intended, the proximal end of the guide section is generally facing the user, while the distal end of the guide section faces away from the user. The distal end is at least indirectly connected to the base section. This connection can be detachable, permanent, rigid, and / or movable.The longitudinal extension of the guide section allows the user to maintain an upright posture while wet-cleaning floors. During wet cleaning, the floor section rests on or against the surface to be cleaned. In configurations with a filter unit, this is preferably detachably attached to the guide section. Alternatively or additionally, the filter unit can also be attached to the floor section, preferably detachably. In configurations with an auxiliary device, this is preferably detachably attached to the guide section. Alternatively or additionally, the auxiliary device can also be attached, at least partially, to the floor section, preferably detachably. In a preferred configuration, the connection between the guide section and the floor section is pivotally movable. In another configuration, the guide section is connected to the floor section by means of a universal joint.

[0057] The surface cleaning system according to the invention comprises a surface cleaning device as described above and a robotic device. The robotic device is detachably connectable to and / or attached to the surface cleaning device and is configured for autonomous movement of the surface cleaning device across the surface. In one embodiment, the robotic device is also configured for autonomous control of at least one function or all functions of the surface cleaning device. Due to the detachable connection, the surface cleaning system according to the invention can be converted between an autonomous operating configuration and a manual operating configuration. In the autonomous operating configuration, the robotic device is detachably connected to the surface cleaning device, for example, to a guide element and / or base element of the surface cleaning device.In the manual configuration, the robotic device is separate from the surface cleaning unit. The autonomous configuration allows the surface cleaning unit to move autonomously across the surface to be cleaned, in particular to clean the surface autonomously. The manual configuration, on the other hand, involves manual movement of the surface cleaning unit across the surface to be cleaned. The surface cleaning system according to the invention can therefore be adapted to a specific cleaning task. For example, smaller areas and / or areas unsuitable for autonomous cleaning can be cleaned in the manual configuration of the surface cleaning system. Larger areas and / or areas unsuitable for manual cleaning can be cleaned in the autonomous configuration of the surface cleaning system.The ability to use the same surface cleaning system for both autonomous and manual cleaning eliminates the need for two separate surface treatment devices: a manual / hand-held cleaning device and an autonomous cleaning device. This saves on equipment costs and also reduces time and / or personnel requirements. The robotic device has at least one liquid reservoir and / or a fluid path. The liquid reservoir and / or fluid path of the robotic device are connectable to and / or connected to the fluid path of the surface cleaning device. The liquid reservoir and / or fluid path of the robotic device increases the available liquid volume. The liquid reservoir can also be referred to as an auxiliary tank. The fluid path of the robotic device can also be referred to as an auxiliary path.In one embodiment, the robot device comprises at least one filter device as described above. In another embodiment, the robot device comprises, alternatively or additionally to the filter device, at least one additive device as described above. The filter device and / or additive device offer different advantages. To avoid repetition, reference is made to the relevant disclosures relating to the filter device and its embodiments according to the invention, as well as to the additive device and its embodiments according to the invention.

[0058] In a further embodiment of the invention, the robotic device does not have its own (or an additional) liquid container and is designed to provide a filter device between the liquid intake and liquid discharge of the surface cleaning device, thus creating a fluid path with a filter device that the surface cleaning device integrated into the robotic device does not, in its respective configuration, possess on its own. This allows even older surface cleaning devices with fluid paths that are unsuitable for use with the filter device and / or additive device according to the invention to be improved using the means of the invention.

[0059] In a further embodiment of the invention, the surface cleaning device is not handheld but designed as an autonomous surface cleaning device. The use of a filter device, an additive device, a kit, a fluid tank, and / or a surface cleaning system according to the invention is also particularly advantageous for such (non-handheld, autonomous) surface cleaning devices, since an additional quantity of liquid can be provided without any significant impact on weight or installation space and used to improve the function, in particular to increase the cleaning time or area and / or to improve the cleaning performance.Alternatively, the invention makes it possible to eliminate the need for a wastewater tank on the surface cleaning device itself and / or to reduce its overall tank volume, since less liquid needs to be provided due to the repeated use of the same fluid with consistent consumption. Thus, the invention allows for a reduction in weight and / or volume while maintaining functionality and performance, which proves particularly advantageous for autonomous surface cleaning devices.

[0060] Further advantages and features of the invention will become apparent from the claims and from the following description of preferred embodiments of the invention, which are illustrated with reference to the drawings.

[0061] They show: Fig. 1 in schematic block representation an embodiment of a surface cleaning device according to the invention, Fig. 2 in schematic block representation a further embodiment of a surface cleaning device according to the invention, Fig. 3 in schematic side view a further embodiment of a surface cleaning device according to the invention, Fig. 4 in schematic block representation a tool device, a fluid discharge, a fluid intake, a fluid path and a conveying device of the surface cleaning device according to Fig. 3, Fig. 5 in schematic block representation which in Fig. 4 components of the surface cleaning device shown, together with other optional components / equipment of the surface cleaning device, Fig. 6 a perspective view of a further embodiment of a surface cleaning device according to the invention, Fig. 7 a perspective detail view of the surface cleaning device after Fig. 6 in the area of ​​a floor section, Fig. 8 the detailed view after Fig. 7 in a viewing direction rotated by approximately 180°, Fig. 9 a perspective detail view of the surface cleaning device according to the Fig. 6, Fig. 7 to Fig. 8 in the area of ​​an upper housing assembly of a guide part with the fluid tank removed, Fig. 10 a perspective sectional view in the area of ​​the upper housing assembly with attached fluid tank and through an upper tank lid of the fluid tank, Fig. 11 a perspective and partially cut-out view of the upper fuel tank cap, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16 different perspective views of an embodiment of a surface cleaning device according to the invention to illustrate the maneuverability of the surface cleaning device during wet cleaning of a surface, Fig. 17 an embodiment of a fluid tank according to the invention for a surface cleaning device in a simplified schematic sectional view, wherein the fluid tank has a locking device represented as a functional block, Fig. 18 another embodiment of a fluid tank according to the invention with a specifically designed locking device, wherein the locking device assumes a locked state, Fig. 19 the fluid tank after Fig. 18, wherein the locking device assumes a release state, Fig. 20 another embodiment of a fluid tank according to the invention in a simplified schematic sectional view, wherein the fluid tank has a separation device represented as a functional block, Fig. 21 an embodiment of a fluid tank according to the invention with a specifically designed separation device, wherein the separation device comprises a filter device and / or a centrifugation device, each of which is represented as a functional block, Fig. 22 an embodiment of a fluid tank according to the invention with a filter device, wherein the filter device comprises a first filter and a second filter, Fig. 23 the fluid tank after Fig. 22 in an exploded view, Fig. 24 another embodiment of a fluid tank according to the invention with filter device, wherein the filter device comprises a coarse filter and a fine filter. Fig. 25 another embodiment of a fluid tank according to the invention with filter device and with a filter cleaning device, Fig. 26 Another embodiment of a fluid tank according to the invention with a filter device and with a filter cleaning device, wherein the filter cleaning device comprises a cleaning element and a movement mechanism, Fig. 27, Fig. 28 further embodiments of the fluid tank according to Fig. 26 each with a specifically designed filter cleaning system, Fig. 29 in schematic sectional view along a section line Q'-Q' according to Fig. 21 another embodiment of a fluid tank according to the invention with a centrifugation device having a stationary fluid guide element, Fig. 30 in schematic sectional view along a section line Q'-Q' according to Fig. 21 another embodiment of a fluid tank according to the invention with a centrifugation device comprising a rotatably movable fluid guide element, Fig. 31 in a schematically simplified sectional view a further embodiment of a fluid tank according to the invention with a disinfection device represented as a functional block, Fig. 32 another embodiment of a fluid tank according to the invention with disinfection device, wherein the disinfection device comprises a UV light source arranged outside a tank volume of the fluid tank, Fig. 33 another embodiment of a fluid tank according to the invention with disinfection device, wherein its UV light source is arranged in the tank volume, Fig. 34 the fluid tank after Fig. 33 in exploded view, Fig. 35 in a schematically simplified sectional view a further embodiment of a fluid tank according to the invention with a connecting section for mechanical and / or fluid-conducting connection with a suction device of the conveying device of the surface cleaning device, Fig. 36 in exploded view of the fluid tank after Fig. 35 together with the suction device, Fig. 37 in a schematically simplified sectional view a further embodiment of a fluid tank according to the invention with a separating device shown as a functional block, Fig. 38, Fig. 39, Fig. 40 schematically simplified sectional views of a further embodiment of a fluid tank according to the invention with a separating device, wherein the separating device has a separating element which is movably arranged between different positions in the tank volume, Fig. 41 a schematic sectional view of the movable separating element, Fig. 42, Fig. 43, Fig. 44 schematically simplified sectional views of further fluid tanks according to the invention with a separating device, wherein the separating elements are designed differently and / or are movable, Fig. 45 in schematic block representation a further embodiment of a separating device for a fluid tank according to the invention, wherein the separating device has a movable separating element and a locking device, Fig. 46 another schematic representation of the separating device according to Fig. 45, Fig. 47 an embodiment of the separation device, wherein the separation device, in addition to the locking device, comprises a separation device, a detection device and / or a disinfection device, each of which is represented as a generic functional block, Fig. 48, Fig. 49, Fig. 50 in a schematically simplified sectional view another embodiment of a fluid tank according to the invention with a separating device, wherein the separating element is elastically deformable and assumes different deformation states, Fig. 51 in a schematically simplified sectional view a further embodiment of a fluid tank according to the invention, Fig. 52 the fluid tank after Fig. 51 along a section line QQ according to Fig. 51, Fig. 53 In a schematically simplified sectional view, a further embodiment of a fluid tank according to the invention with a modular structure, Fig. 54 the fluid tank after Fig. 53 in exploded view, Fig. 55 a simplified side view of a surface cleaning device not according to the invention, with a fresh water tank and a separate dirty water tank, Fig. 56 a schematic side view of a further embodiment of a surface cleaning device according to the invention, which uses an embodiment of a fluid tank according to the invention and the non-inventive surface cleaning device according to Fig. 55 is formed, Fig. 57 in schematic block representation an arrangement with an embodiment of a fluid tank according to the invention and an additional tank, Fig. 58 in schematic block representation an embodiment of a surface cleaning system according to the invention with a surface cleaning device and a base station, Fig. 59 in schematic block representation an embodiment of a method according to the invention for wet cleaning a surface using a surface cleaning device, Fig. Figure 60 shows a schematic block representation of an embodiment of a filter device according to the invention for a surface cleaning device according to the invention, comprising a filter unit, a support structure, a filter cleaning device and an additive. Fig. 61 in schematic block representation an exemplary embodiment of a filter unit of the filter device according to Fig. 60, Fig. 62 Another schematic block diagram to illustrate further features of the filter cleaning device of the filter device according to Fig. 60, Fig. 63 a further schematic block diagram to illustrate characteristics of the additive of the filter device according to Fig. 60, Fig. 64 a further schematic block diagram concerning the additive and the filter unit of the filter device according to Fig. 60, Fig. 65 in schematic block representation an embodiment in which the additive is soluble in the filter unit, Fig. 66 in schematic block representation an embodiment of a kit according to the invention for forming a filter device according to the invention, Fig. 67 in schematic block representation an embodiment of an additive device according to the invention for a surface cleaning device according to the invention, Fig. 68 in schematic perspective view a further embodiment of a fluid tank according to the invention with an embodiment of a filter device according to the invention integrated into the fluid tank with a scraper device, Fig. 69 the fluid tank after Fig. 68 in a schematic longitudinal section, Fig. 70, Fig. 71 each in a perspective longitudinal section an embodiment of a filter unit including support structure, Fig. 72 in a schematic longitudinal section a further embodiment of a fluid tank according to the invention with an embodiment of a filter device according to the invention with a vibration device, Fig. Figure 73 shows a schematic perspective view of an embodiment of an auxiliary device according to the invention. Fig. 74 the additional resources facility according to Fig. 73 in a perspective longitudinal section, Fig. Figure 75 shows a schematic perspective view of an embodiment of a surface cleaning system according to the invention, comprising a surface cleaning device and a robotic device. Fig. 76 another schematic perspective view of the surface cleaning system according to Fig. 75, Fig. 77 another schematic perspective view of the surface cleaning system according to the Fig. 75 and Fig. 76, wherein the robot device assumes an open state for the purpose of removing the surface cleaning device, and Fig. 78 the robotic device of the surface cleaning system according to the Fig. 75, Fig. 76 to Fig. 77 in a perspective exploded view.

[0062] According to Fig. 1 is a surface cleaning device 1 for wet cleaning a surface S. The surface S to be cleaned is, in this case, a floor surface S', for example, a floor surface in a building, such as, in particular, a hard floor or carpet.

[0063] The surface cleaning device 1 is in Fig. 1 schematically simplified representation and features a tool device 300, a fluid discharge 400, a fluid intake 500, a fluid path 600 and a conveying device 700.

[0064] The tool assembly 300 is configured to act on surface S. The fluid outlet 400 is configured to discharge fluid F onto surface S. The fluid intake 500 is configured to receive fluid F from surface S. The fluid path 600 connects the fluid intake 500 to the fluid outlet 400 via a fluid-conducting system. The conveying device 700 is configured to convey fluid F along the fluid path 600. This allows fluid F, received by the fluid intake 500, to be returned along the fluid path 600 to the fluid outlet 400 via the conveying device 700 and then discharged onto surface S.

[0065] For wet cleaning of surface S, the surface cleaning device 1 can be moved across surface S along a direction of movement B. During this process, surface S is moistened with the dispensed fluid F. To loosen dirt from surface S, the tool assembly 300 acts upon the surface. Moistening surface S improves dirt removal and binding of the loosened dirt. The previously applied fluid F, along with the loosened dirt, is then collected by the fluid intake 500 and conveyed by the conveyor 700 along the fluid path 600 to the fluid outlet 400 for redelivery.

[0066] The aforementioned fluid recirculation reduces the fluid consumption required for wet cleaning. Furthermore, a fluid storage tank is generally unnecessary, specifically the separate fresh and dirty water tanks typically found in other technologies. This allows the surface cleaning unit 1 to be designed to be particularly compact and lightweight. The compact and lightweight construction also simplifies handling of the surface cleaning unit 1 by a single user. Specifically, the surface cleaning unit 1 can be moved with reduced effort. The fluid recirculation also enables improved cleaning results at the same or even increased cleaning speed (area cleaned per unit of time). The cleaning result is primarily determined by the amount of fluid dispensed per unit of time (dispensing rate). In principle, higher dispensing rates lead to better cleaning results.In surface cleaning devices known from the prior art without fluid recirculation, i.e., without a fluid circuit, and with separate fresh water and wastewater tanks, the discharge rate is limited by design. This applies to surface cleaning device 1 according to... Fig. This is not the case with device 1. Furthermore, the surface cleaning device 1 allows for increased cleaning speed, as refilling the dispensed fluid and disposing of the collected fluid are essentially unnecessary. This saves time and effort.

[0067] In the embodiment according to Fig. 2. In addition to the tool assembly 300, the fluid dispensing unit 400, the fluid intake unit 500, the fluid path 600, and the conveying unit 700, the surface cleaning device 1 has further components and / or devices 100, 200, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800. Moreover, the surface cleaning device can include an auxiliary device 1450 as a further component. Fig. 67 and in particular after the Fig. 73 and Fig. 74. These optional components and / or features each offer particular advantages, both individually and in combination.

[0068] The aforementioned optional components and / or devices are a guide part 100, a bottom part 200, a fluid reservoir 800, a fluid tank 900, a carrying device 1000, a locking device 1100, a separating device 1200, a separating device 1300, a detection device 1400, a disinfection device 1500, a power supply device 1600, a thrust device 1700 and a connecting device 1800.

[0069] The guide element 100 is designed for manually guiding the surface cleaning device 1 during wet cleaning of the surface S and can also be referred to as a hand guide element. Therefore, in configurations with a guide element 100, the surface cleaning device can also be described as hand-guided. In preferred configurations, the guide element 100 extends longitudinally between a proximal end and a distal end. The longitudinal design of the base section allows the user to maintain an upright posture even when cleaning floor surfaces S'.

[0070] The base section 200 rests against surface S during wet cleaning and can also be referred to as the surface cleaning head. In configurations with a guide section 100, the base section 200 is connected to the distal end of the guide section 100. In configurations without a guide section, the base section can be designed, for example, for autonomous, electric, or electronic guidance. Autonomous guidance can be achieved, for example, through artificial intelligence and / or remote control, such as via a local (wireless) or mobile data network.

[0071] The tool assembly 300, the fluid outlet 400, the fluid intake 500, the fluid path 600, and the conveying device 700 can each be arranged on the guide part 100 and / or on the base part 200. The tool assembly 300, the fluid outlet 400, and the fluid intake 500 are preferably arranged on the base part 200.

[0072] The fluid reservoir 800 has a reservoir volume 801, a reservoir inlet 802 which is or can be connected to the fluid intake 500 via a fluid-conducting connection, and a reservoir outlet 803 which is or can be connected to the fluid discharge 400 via a fluid-conducting connection. The reservoir inlet 802 and the reservoir outlet 803 are fluid-conductingly connected to each other via the reservoir volume 801. The reservoir volume 801 serves as a storage or buffer for the fluid F to be discharged and received. During wet cleaning, fluid F received by the fluid intake 500 is introduced into the reservoir volume 801 via the reservoir inlet 802 and from there discharged from the reservoir volume 801 via the reservoir outlet 803 for re-discharge by means of the fluid discharge 400. The fluid reservoir 800 is designed differently in different embodiments, specifically as a fluid tank 900 or an arrangement of several fluid tanks.Alternatively or additionally, the reservoir volume 801 can be formed at least sectionally by cross-sections and / or cavities of the guide part 100, the bottom part and / or the tool device 300.

[0073] The fluid tank 900 has a tank volume 901, a tank inlet 902, and a tank outlet 903. The tank inlet 902 is fluidly connected or connectable to the fluid intake 500. The tank outlet 903 is fluidly connected or connectable to the fluid discharge 400. The tank inlet 902 and the tank outlet 903 are fluidly connected or connectable to each other via the tank volume 901. The fluid tank 900 can be considered a special embodiment of the fluid reservoir 800. The fluid tank 900 can, in principle, have any design suitable for the present purpose. In a preferred embodiment, the fluid tank 900 is detachably attached to the guide element 100. However, attachment to the base element 200 and / or the optional support device 1000 is also conceivable and possible.

[0074] In the embodiment shown, the reservoir volume 801, specifically the tank volume 901, is 2 liters. In other embodiments, the reservoir volume 801, specifically the tank volume 901, is a maximum of 10 liters.

[0075] The fluid reservoir 800, specifically the fluid tank 900, is made at least partially of a transparent material, in this case a transparent plastic K. The fluid reservoir 800 can have several fluid-conducting or connectable sub-reservoirs. The same applies to the fluid tank 900. In this case, however, the fluid reservoir 800, specifically the fluid tank 900, is a single container.

[0076] The carrying device 1000 is designed to be carried on the user's body and is specifically configured as a backpack device 1001 or a belt device 1002. The backpack device 1001 can be worn on the user's back. The belt device 1002 can be worn around the user's hips and / or shoulders. The carrying device 1000 serves to accommodate further components and / or equipment of the surface cleaning device 1. For example, the conveyor device 700, the fluid reservoir 800 and / or the fluid tank 900, as well as the power supply device 1600, in particular its at least one energy storage unit 1601, can be designed to be carried on the carrying device 1000.

[0077] The shut-off device 1100 allows for the selective interruption or blocking of fluid return. For this purpose, the shut-off device 1100 can be switched between an open state and a closed state. In the open state, fluid return is maintained. In the closed state, fluid return is interrupted by means of the shut-off device 1100. For this purpose, the fluid-conducting connection between the fluid inlet 500 and the fluid outlet 400 is blocked by the shut-off device 1100. In configurations without a fluid reservoir 800 and / or fluid tank 900, the shut-off device 1100 interrupts the fluid path 600. In configurations with a fluid reservoir 800 and / or fluid tank 900, the shut-off device 1100 is designed for the fluid-tight separation of the reservoir inlet 802 and the reservoir outlet 803, specifically the tank inlet 902 and the tank outlet 903.This function of the shut-off device 1100 is illustrated by the dashed lines drawn in the reservoir volume 801 and the tank volume 901. When the shut-off device 1100 is in the closed position, the reservoir volume 801 is divided into a fluid discharge reservoir volume 8011 and a fluid intake reservoir volume 8012. The fluid discharge reservoir volume 8011 has the reservoir outlet 803 and is separated from the reservoir inlet 802 by means of the shut-off device 1100. The fluid intake reservoir volume 8012 has the reservoir inlet 802 and is separated from the reservoir outlet 803 by means of the shut-off device 1100. The same applies, mutatis mutandis, to a subdivision of the tank volume 901 into a fluid discharge tank volume 9011 and a fluid intake tank volume 9012.

[0078] The separation device 1200 also serves to divide the reservoir volume 801, specifically the tank volume 901, into the aforementioned partial volumes 8011, 8012 and 9011, 9012, respectively. The separation device 1200 allows for a variable subdivision according to the proportions of the total available volume 801, 901, whereby the discharge volumes 8011, 9011 and the intake volumes 8012, 9012 vary during the wet cleaning process. As the fluid discharge reservoir volume 8011 decreases, the fluid intake reservoir volume 8012 increases. The same applies to the fluid discharge tank volume 9011 and the fluid intake tank volume 9012.

[0079] The separator 1300 is designed to separate dirt from the fluid F received by the fluid intake 500. The separator 1300 removes dirt from the fluid and reduces its degree of contamination. The separator 1300 can be located at any point or at several points along the fluid path 600. In configurations with a fluid reservoir 800, dirt separation by the separator 1300 can occur upstream of the reservoir volume 801 (upstream), downstream of the reservoir volume 801 (downstream), and / or within the reservoir volume 801. The same applies to dirt separation in relation to the tank volume 901 in configurations with a fluid tank 901. In the illustrated embodiment, the separator 1300 includes a filter unit 1301.Alternatively or additionally, the separator 1300 includes a centrifuge 1350. The filter unit 1301 is designed to filter the fluid F. The centrifuge 1350 is designed to generate centrifugal forces in the fluid F.

[0080] The detection device 1400 is configured to detect the degree of contamination G of the fluid F received by means of the fluid intake 500. In a particularly simple embodiment, the detection device 1400 has a sight glass or the like arranged in the fluid path 600, through which the user can visually determine the degree of contamination G. In the embodiment shown, the detection device 1400 has a sensor device 1401, which is configured to measure the degree of contamination G and to output a sensor signal 1402 representing the degree of contamination G. The sensor signal 1402 can be controlled by an optional control device 1900 of the surface cleaning device 1 (see Fig. 6) processed and output as a signal perceptible to the user. Alternatively or additionally, further components and / or devices of the surface cleaning device 1 can be controlled depending on the sensor signal 1402.

[0081] The disinfection device 1500 is configured for disinfecting at least sections of the fluid path 600 and / or the fluid F flowing therein. In embodiments with a fluid reservoir 800, specifically a fluid tank 900, the disinfection device 1500 is preferably configured for disinfecting the reservoir volume 801, specifically the tank volume 901. In a particularly simple embodiment, the disinfection device 1500 is formed by a section of the fluid path 600 that is made of or coated with an antibacterial material. In the illustrated embodiment, the disinfection device 1500 has at least one UV light source 1501. The UV light source 1501 is configured to emit UV light and can, in principle, be arranged at any point along the fluid path 600, upstream, downstream, and / or in the reservoir volume 801, specifically the tank volume 901.

[0082] The power supply unit 1600 provides electrical operating energy to the surface cleaning device 1. At least the tool assembly 300 and the conveyor assembly 700 can be supplied with electrical operating energy by means of the power supply unit 1600. In the illustrated embodiment, the power supply unit 1600 also serves to provide energy to any further (optional) components, for example, the sensor assembly 1401 and the UV light source 1501. In the illustrated embodiment, the power supply unit 1600 has at least one energy storage device 1601 in the form of a rechargeable battery. In embodiments with a guide part 100, a base part 200, or a support device 1000, the energy storage device 1601 can be attached to the guide part 100, the base part 200, and / or the support device 100. A removable attachment is preferred.Furthermore, the energy storage device 1601 can be optionally attached to the base part 100, the guide part 200, and the carrying device 1000, so that the user can decide, depending on the cleaning task, on which of the aforementioned components / devices 100, 200, or 1000 the energy storage device 1601 should be attached to and carried during wet cleaning. In an embodiment not shown in the figures, the energy supply device has several energy storage devices. The multiple energy storage devices can each be arranged on the base part, the guide part, or the carrying device. For example, one energy storage device on the base part can supply energy to the tool device, and another energy storage device on the guide part can supply energy to the disinfection device and / or the sensor device.

[0083] The thrust device 1700 is designed to generate a thrust force V along a thrust direction R. This thrust force V assists the manual movement of the surface cleaning device 1. If the thrust force V is sufficiently strong, the movement of the surface cleaning device 1 can also be driven solely by the thrust device 1700. In this case, the user can limit themselves to controlling the direction R of the movement B, for example, by guiding the direction R via the guide element 100. Such thrust (thrust force along the thrust direction) can also be generated using the tool device 300, as will be explained in more detail below. The thrust device 1700 can be used as an alternative to, or in addition to, a tool device designed to generate thrust.

[0084] The connecting device 1800 serves as a relatively movable connection between the guide part 100 and the base part 200. The connecting device 1800 is designed such that the direction of movement B, specifically the forward direction R, can be controlled by moving the guide part 100 relative to the base part 200. In the illustrated embodiment, the connecting device 1800 forms a gimbal connection 1801 between the guide part 100 and the base part 200. As will be explained in more detail below, the gimbal connection 1801 allows for particularly simple and intuitive maneuvering of the surface cleaning device 1. That is, the direction of movement B, in particular the forward direction R, of the base part 200 can be controlled particularly easily and intuitively by manually moving the guide part 100 via the gimbal connection 1801.

[0085] In the illustrated embodiment, the conveying device 700 comprises a pumping device 701 and a suction device 750. In embodiments with a fluid reservoir 800, the pumping device 701 is arranged downstream of the reservoir outlet 803 and is configured to pump fluid F from the reservoir volume 801 through the fluid discharge 400 via the reservoir outlet 803. The same applies to embodiments with a fluid tank 900. The suction device 750 is configured to generate a vacuum within the fluid reservoir 801 in order to draw fluid F from the fluid intake 500 through the reservoir inlet 802 into the reservoir volume 801. The same applies to embodiments with a fluid tank 900. In an embodiment not shown in the figures, the suction device 750 is configured for (optional) carrying on the user's body by means of the carrying device 1000.

[0086] The Fig. 3, Fig. 4 to Fig. Figure 5 shows another exemplary embodiment of a surface cleaning device according to the invention 1.

[0087] According to Fig. 3. The surface cleaning device 1 comprises a guide part 100, a base part 200, a fluid discharge 400, a fluid intake 500, a fluid path 600, a conveying device with a pumping device 701 and a suction device 750, a fluid tank 900, a separating device 1300, a power supply device 1600, and a connecting device 1800. The basic function and design of the aforementioned components and / or devices of the surface cleaning device 1 are described in relation to the embodiment according to the Fig. 3, Fig. 4 to Fig. 5 is not explained in detail again. Instead, reference is made to the disclosure regarding the embodiments according to the Fig. 1 and Fig. 2. Reference is made to and express reference is made to. What has already been disclosed there also applies to the embodiment according to the Fig. 3, Fig. 4 to Fig. 5, unless otherwise described.

[0088] Further regarding Fig. 3 The guide element 100 extends longitudinally along a longitudinal axis 101 between a proximal end 102 and a distal end 103. At its proximal end 102, the guide element 100 has a handle 1021. The distal end 103 faces the base element 200 and thus also the surface S to be cleaned, which in this case is a floor surface S' extending in an XY plane.

[0089] The base part 200 is arranged at the distal end 103 of the guide part 100 and is connected to the guide part 100 by means of the connecting device 1800.

[0090] The connecting device 1800 forms a gimbal connection 1801. In the embodiment shown, the connecting device 1800 has a first pivot axis 1802 and a second pivot axis 1803. The two pivot axes 1802, 1803 can be axes in the geometric sense or physically existing axes. The mobility of the guide part 100 relative to the base part 200 resulting from the gimbal connection 1801, and the resulting controllability of the direction of movement B of the base part 200, will be described in detail below. Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16 explained.

[0091] The tool assembly 300 is arranged on the base part 200 and comprises at least one movable tool 301 and a drive motor 302. As can be seen from the Fig. 4 and Fig. As will be explained in section 5, two tools are present. The at least one tool 301 can be driven by the drive 302 to perform a rotary tool movement. In embodiments not shown in the figures, the tool assembly can have oscillating translational and / or eccentrically driven tools. The driven tool movement of the at least one tool 301 is relative to the base part 200. The driven tool movement loosens dirt from the surface S.

[0092] In the embodiment shown, the at least one tool 301 is a scrubbing tool 303 designed for wet scrubbing of the surface S. The surface cleaning device 1 is designed as a scrubber dryer 1'.

[0093] The at least one tool 301 can, for example, be a roller tool 304 or a disc tool 305, the latter being the case in the embodiment specifically shown. Any roller tool 304 is driven rotaryally about a horizontal axis of rotation. The disc tool 305 shown is driven rotaryally about a vertical axis of rotation.

[0094] The fluid dispensing device 400 has at least one outlet opening 401 through which fluid can be dispensed onto the surface S to be cleaned. In all embodiments, the fluid F is not dispensed directly from the outlet opening onto the surface S, but can also be dispensed indirectly via the tool assembly. For example, by first applying the fluid to the movable tool and then transferring it to the surface S. The in Fig. The arrangement of the fluid discharge 400 and its outlet opening 401 shown in Figure 3 is therefore to be understood as purely exemplary. The outlet opening 401 is arranged in front of the movable tool 301 and the fluid intake 500 with respect to the direction of movement B, which can specifically be a thrust direction R. In an embodiment not shown in the figures, the fluid discharge occurs through the tool assembly, for example, through a rotary axis of the at least one disc tool.

[0095] Further according to Fig. Figure 3 shows that the fluid intake 500 has a suction bar 501 arranged and / or attached to the base part 200. During wet cleaning, the suction bar 501 rests on the surface S. In the illustrated embodiment, the suction bar 501 is movable relative to the tool assembly 300 in a manner not shown in detail, and can therefore be lifted from the surface S, particularly in a vertical direction Z. By lifting the suction bar 501, the surface S can first be pre-scoured without receiving any fluid. After pre-scouring, the suction bar 501 can be placed against the surface S and the previously applied fluid, along with the dirt loosened from the surface S, can be collected.

[0096] In the illustrated embodiment, the suction strip 501 has a first sealing lip 502, a second sealing lip 503, and a suction channel 504 formed between the first sealing lip 502 and the second sealing lip 503. The first sealing lip 502 can be distinguished with respect to the Fig. The direction of movement B shown in Figure 3 can also be referred to as the rear sealing lip. The second sealing lip 503 can also be referred to as the front sealing lip. During wet cleaning, both sealing lips 502 and 503 lie tightly against the surface S. The front sealing lip 503 has recesses (not shown in detail) that open into the suction channel 504 and extend longitudinally along the suction bar 501 (see also Figure 3). Fig. 4, Fig. 5) are arranged at intervals from each other. This allows fluid that has accumulated in front of the first sealing lip 503 to pass through the recesses into the suction channel 504 and from there via the fluid path 600 first into the fluid tank 900 and from there back to the fluid outlet 400.

[0097] The Fluid Path 600 is in Fig. Figure 3 schematically depicts the system and comprises a first fluid path section 601 and a second fluid path section 602. The first fluid path section 601 can also be referred to as the intake path. The second fluid path section 602 can also be referred to as the discharge path. The fluid path 600 extends from the fluid intake 500, specifically its suction channel 504, through the fluid tank 900 to the fluid discharge 400, specifically to the at least one outlet opening 401. In this case, the first fluid path section 601 connects the fluid intake 500 to the fluid tank 900. The second fluid path section 602 connects the fluid tank 900 to the fluid discharge 400.

[0098] The fluid path 600 and its individual sections can generally be designed as a hose and / or pipe. Alternatively or additionally, the fluid path 600 can be formed, at least section by section, by cross-sections or cavities of other components or devices of the surface cleaning device 1, for example, by cross-sections or cavities of the guide part 100, the base part 200, and / or the tool assembly 300.

[0099] Further according to Fig. Figure 3 shows that the fluid tank 900 is attached to the guide element 100 and is removable in a manner not shown in detail. The fluid tank 900 has a tank volume 901, a tank inlet 902, and a tank outlet 903. The tank inlet 902 is connected to the fluid intake 500, specifically to its fluid channel 504, by means of the first fluid path section 601. The tank outlet 903 is connected to the fluid delivery 400, specifically to the at least one outlet opening 401, by means of the second fluid path section 602. The tank inlet 902 and the tank outlet 903 are fluid-conductingly connected to each other via the tank volume 901. The fluid path 600 between the tank inlet 902 and the tank outlet 903 extends through the tank volume 901. In other words, the tank volume 901 forms a further section of the fluid path.

[0100] To convey the fluid F along the fluid path 600 and thus also through the fluid tank 900, the conveying device comprises a pumping device 701 and a suction device 750. In the illustrated embodiment, the pumping device 701 is arranged downstream of the tank outlet 903 in the fluid path 600. By means of the pumping device 701, fluid located in the tank volume 901 can be pumped through the tank outlet 903 and from there via the fluid path 600, specifically the second fluid path section 602, through the outlet opening 401 and thus discharged onto the surface S.

[0101] The suction device 750 serves to generate a negative pressure within the tank volume 901. For this purpose, the suction device 750 draws air from the tank volume 901, releasing the extracted air to the environment via exhaust openings (not shown in detail). The negative pressure thus generated in the tank volume 901 causes the fluid intake 500 to draw in previously discharged fluid, ambient air, and any dirt, and to discharge it into the tank volume 901 via the fluid path 600, specifically the first fluid path section 601. The suction device 750 is arranged above a fluid level P in the tank 900. The pumping device 701 is arranged below the fluid level P.

[0102] Further according to Fig. 3 the separator device 1300 is arranged in the tank volume 901.

[0103] The power supply unit 1600 includes an energy storage device 1601 in the form of a rechargeable battery. In the illustrated embodiment, the energy storage device 1601 is attached to the guide element 100 and is removable in a manner not shown in detail.

[0104] Further features of the surface cleaning device 1 according to Fig. 3 are in the Fig. 4 and Fig. 5 shown. Fig. Figure 4 shows a schematic top view of the tool device 300, the fluid discharge 400 and the fluid intake 500, with the fluid path 600 and the conveying device 700 being shown in a simplified manner.

[0105] As already mentioned in relation to Fig. As explained in section 3, the tool assembly 300 comprises two tools, specifically designed as disc tools 305', 305''. The two disc tools 305', 305'' are described in relation to Fig. 4 also referred to as first disc tool 305' and second disc tool 305''. The two disc tools 305', 305'' are arranged side by side with respect to a transverse direction Y of the surface S to be cleaned and thus also with respect to a transverse axis of the surface cleaning device 1.

[0106] In the illustrated embodiment, the working width of the tool assembly 300, extending orthogonally to the direction of movement B shown, specifically the direction of travel V, is approximately 35 cm. In this case, the working width corresponds to the outer distance between the two disc tools 305', 305''. In embodiments not shown in the figures, the working width is between 15 cm and 100 cm.

[0107] The first disc tool 305' is driven rotaryally about a first axis of rotation D'. The second disc tool 350'' is driven rotaryally about a second axis of rotation D''. In this case, the first disc tool 305' is driven clockwise. The second disc tool 305'' is driven counterclockwise. Starting from a precisely vertical orientation parallel to the vertical axis Z, the two axes of rotation D', D'' are inclined towards each other by a few degrees. This slight inclination of the two axes of rotation D', D'' creates an unequal surface pressure in the circumferential direction of the disc tools 305', 305'' in contact with the surface S. The surface pressure increases radially from the respective axis of rotation D', D'' towards the center of the tool assembly 300 and thus along the transverse axis of the surface cleaning device 1.The respective drive movement generates unequal frictional forces due to the unequal surface pressure and thus the aforementioned propulsion, that is, a propulsive force V along a propulsion direction R.

[0108] To generate the thrust, instead of or in addition to the described inclined position of the axes of rotation D', D'', a local force application to the disc tools 305', 305'' can be provided. In this case, the disc tools 305', 305'' are each subjected to an axial force A directed backwards onto the disc tools 305', 305'' parallel to the vertical axis Z. The respective axial force A in turn generates an unevenly distributed surface pressure and thus, during operation of the tool assembly 300, unevenly distributed frictional forces, which result in the thrust force V. The surface cleaning device 1 can have a pre-tensioning device or the like to apply the respective axial force A.

[0109] What next based on Fig. As shown in Figure 4, two outlet openings 401 are present. The arrangement of the two outlet openings 401 in relation to the disc tools 305', 305'' is to be understood as exemplary. The outlet openings 401 can also be arranged on or below the disc tools 305', 305''. In this case, the fluid path extends at least partially through a cross-section of the disc tools 305', 305'', for example, through the axes of rotation D', D''.

[0110] Further regarding Fig. Figure 4 shows that the suction bar 501 is curved longitudinally in sections around the tool assembly 300, specifically around the disc tools 305', 305'', with respect to the XY plane and thus parallel to the surface S to be cleaned. With respect to the feed direction R, the suction bar 501 is arranged behind the two outlet openings 401 and the two disc tools 305', 305''.

[0111] Based on Fig. Figure 5 shows that the fluid path 600 of the surface cleaning device 1 can have alternative or additional devices. Instead of or in addition to the fluid tank, a fluid reservoir 800 can be provided. Furthermore, the fluid path 600 can have a shut-off device 1100, a separation device 1200, a detection device 1400 and / or a disinfection device 1500.

[0112] The Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. Figure 11 shows a further embodiment of a surface cleaning device 1 according to the invention, which is designed as a scrubber-dryer 1'. The design and function of the surface cleaning device 1 according to the Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 is essentially identical in design and function to the surface cleaning device 1 according to the Fig. 3, Fig. 4 to Fig. 5. To avoid repetition, the following section primarily explains differences and further details of the design and function. For further information, please refer to the disclosure regarding the surface cleaning device according to the Fig. 3, Fig. 4 to Fig. 5 and also on the disclosure concerning surface cleaning equipment according to the Fig. 1 and Fig. 2 referred.

[0113] For the surface cleaning device 1 according to the Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. The first fluid path section 601 is designed as a hose, which can also be referred to as the receiving hose 6013. The receiving hose 6013 extends longitudinally between a first hose end 6011 and a second hose end 6012. The first hose end 6011 is attached to the suction bar 501 and fluid-conductingly connected to its suction channel 504. The second hose end 6012 is attached in a manner described in more detail below and fluid-conductingly connected to the tank inlet 902.

[0114] The intake hose 6013 is freely accessible and, in particular, is not routed through the cross-sections of other components or devices of the surface cleaning device 1, is not covered by panels, or otherwise shielded. This allows the intake hose 6013 to be easily and quickly removed for cleaning by loosening the fastenings of the first hose end 6011 and the second hose end 6012.

[0115] The second fluid path section 602 (see Fig. 7, Fig. 8) leads from the tank outlet 903, which leads into the Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 is not shown in detail, up to the fluid output 400.

[0116] The fluid discharge 400 is, in this case, at least partially integrated into the base part 200 and has outlet openings 401 arranged in the area of ​​the tool assembly 300, which are located in the Fig. 6, Fig. 7, Fig. 8 to Fig. 9 are not apparent in detail.

[0117] The second fluid path section 602 comprises several hose sections 6021, 6022, 6023, and 6024, which are connected to each other by hose connectors (without reference numerals). The hose sections 6021, 6022, 6023, and 6024 can also be designated as the first hose section 6021, the second hose section 6022, the third hose section 6023, and the fourth hose section 6024. Similar to the receiving hose 6013, the hose sections 6021, 6022, 6023, and 6024 are exposed and thus easily accessible and removable for cleaning.

[0118] The pumping device 701 is a hose pump 702, which can also be referred to as a peristaltic pump. The hose pump 702 acts on the second fluid path section 602 and is designed to cause external mechanical deformation of a section of the second fluid path section 602. As a result of this elastic deformation, the fluid is pumped through the second fluid path section 602. Specifically, the hose pump 702 is arranged between the first hose section 6021 and the fourth hose section 6024.A further hose section, not shown in detail, connecting these two hose sections 6021 and 6024, lies within a housing 7021 of the peristaltic pump 702. For the purpose of pumping the fluid, this hose section is deformed by a movable pumping element of the peristaltic pump 702 (not shown), which in this case is a pump rotor mounted rotatorily in the housing 7021. Specifically, it is pinched along a point that moves with the movement of the pump rotor. The housing 7021 is closed with an openable cover 7022. The aforementioned hose section can be removed from the housing 7021 without tools after opening the cover 7022.

[0119] In the embodiment according to the Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. The guide element 100 has a first housing 104 and a second housing 105. The two housings 104 and 105 are spaced apart from each other along the longitudinal axis 101 of the guide element 100. The housing 104 is spaced further away from the base 200 along the longitudinal axis 101 than the second housing 105, so that the housings 104 and 105 can also be referred to as the upper or proximal housing 104 and the lower or distal housing 105. The two housings 104 and 105 serve to accommodate and / or attach further components and / or devices of the surface cleaning device 1. In particular, the fluid tank 900 is located between the two housings 104 and 105.

[0120] In Fig. Figure 9 shows that the upper housing assembly 104 in the embodiment shown has a first housing section 1041 and a second housing section 1042.

[0121] The first housing section 1041 serves to accommodate the suction device 750. In the illustrated embodiment, the suction device 750 is designed as a suction turbine 751 and is accommodated in the first housing section 1041. The suction device 750, specifically the suction turbine 751, is located in the Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 is not visible in detail and is concealed by the first housing section 1041. The first housing section 1041 has an intake opening 1043 and several exhaust openings 1044. The intake opening 1043 is visible when the fluid tank 900 is attached, which is located in Fig. 9 is hidden, and fluid-conductingly connected to its tank volume 901. This allows air to be drawn from tank volume 901 by means of the suction turbine 751, creating a negative pressure. The air drawn from tank volume 901 by means of the suction turbine 751 is released to the environment via the exhaust openings 1044.

[0122] The second housing section 1042 serves to attach the receiving hose 6013 and connects it fluidly to the tank volume 901. For this purpose, the second housing section 1042 has a passage 1045 which opens at one end into the tank inlet 902 and at the other end into the second hose end 6012 (see Fig. 10).

[0123] The lower housing assembly 105 also serves to mount the energy storage device 1601 and the pumping device 701. The energy storage device 1601 and the fluid tank 900 are arranged and supported on a proximally oriented upper surface of the second housing assembly 105. The pumping device 701 is attached to an opposite, and thus distally oriented, underside of the lower housing assembly 105.

[0124] The surface cleaning device 1 has a control unit 1900, which is configured to control individual functions of the surface cleaning device 1, for example, to switch the power supply on and off by means of the power supply unit 1600, to control a drive speed of the tool unit 300, to control a feed rate of the conveying unit 700, for example, to preferably stepless adjustment of the said feed and take-off rates, or the like. The control unit has several manually operable control elements 1901, which can be designed, for example, as switches, pushbuttons, rotary knobs, or the like. In the embodiment shown, the control unit 1900 is housed in the upper housing unit 104.

[0125] In the embodiment according to the Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 The fluid tank 900 has a specific design with a tank shell 904, a first tank lid 907 and a second tank lid 908.

[0126] The tank shell 904 is, in this case, a hollow cylinder 905, specifically a tube 906. The tank shell 904, specifically the hollow cylinder 905 or the tube 906, is open at its axially opposite ends and can be closed by means of the tank lids 907, 908. The tank shell 904 can, in principle, have any hollow cross-section, although the hollow cylindrical and, in particular, tubular design shown is preferred. The tank shell 904 encloses the tank volume 901. In other words, the tank shell 904 forms the tank volume 901.

[0127] The first tank cap 907 and the second tank cap 908 function as end-end closures of the tank shell 904 and can also be referred to as the upper or proximal tank cap 907 and the lower or distal tank cap 908. The tank caps 907 and 908 are detachably connected to opposite end ends of the tank shell 904. However, a permanent connection between the tank caps and the tank shell is also conceivable and possible.

[0128] The upper tank cap 907 is mounted on and / or detachably attached to the upper housing assembly 104. The lower tank cap 908 is mounted on and / or detachably attached to the lower housing assembly 105.

[0129] The tank inlet 902 and the tank outlet 903 can, in principle, each be located on the tank shell or on one of the tank lids. In the embodiment shown, the latter is the case. Specifically, the tank inlet 902 is formed on the upper tank lid 907 (see figure). Fig. 10, Fig. 11).

[0130] In the illustrated embodiment, the upper tank lid 907 has a first lid section 9071 and a second lid section 9072. The tank inlet 902 is arranged on the first lid section 9071 and opens into an annular inlet channel 9021, which is provided with fluid guide elements 9022 arranged one behind the other in the longitudinal direction of the inlet channel 9021. At its end facing away from the tank inlet 902, the inlet channel 9021 opens into the tank volume 901.

[0131] The first cover section 9071 also has an opening 9073 extending axially into the tank volume 901. When the upper tank cover 907 is installed, this opening opens into the tank volume 901. When the fluid tank 900 is installed, the opening is aligned coaxially with the intake opening 1043 of the upper housing assembly 104 and is fluid-conducting to it. To generate the vacuum, the air in the tank volume 901 is drawn through the opening 9073 and via the intake opening 1043 by means of the suction device 750. The annular design of the inlet channel 9021 counteracts atomization of the drawn-in fluid (aerosol formation), more precisely, the liquid components of the drawn-in fluid, thus preventing any impairment of the suction device 750 designed for drawing in air.

[0132] The tank outlet 903 is formed on the lower tank lid 908 in a manner not shown in detail. The tank outlet 908 opens into a passage in the lower housing assembly 105 (not shown in detail) and from there into the second fluid path section 602, specifically the fourth hose section 6024 (see Fig. 8).

[0133] The connecting device 1800 in turn forms a cardan joint 1801 with a first joint axis 1802 and a second joint axis 1803 (see Fig. 7) In this case, the first articulation axis 1802 is oriented orthogonally to the direction of travel R. The second articulation axis 1803 is parallel to the direction of travel R and thus orthogonal to the first articulation axis 1802. In this case, the first (distal) articulation axis 1802 lies closer to the bottom section 200 along the longitudinal axis 101 than the second (proximal) articulation axis 1803.

[0134] In a top view looking along the Z-axis, the intersection point of the first joint axis 1802 and the second joint axis 1803 lies within a contour of the base part 200, including the tool assembly 300 and the suction bar 501, projected onto the surface S to be cleaned. Specifically, the intersection point is not located behind the aforementioned contour.

[0135] It is understood that the gimbal connection 1801 can also be formed by a joint without physical joint axes, an elastic section or the like.

[0136] Due to the gimbal connection 1801, a rotation of the guide part 100 about its longitudinal axis 101 causes the base part 200 to rotate about its vertical axis 201, without the base part 200 lifting off or tilting from the surface S. During wet cleaning, the vertical axis 201 of the base part 200 is parallel to the Z-axis and thus orthogonal to the surface S. Consequently, the base part 200 is rotated in an XY plane parallel to the surface S to be cleaned and / or while resting on the surface S. The rotation of the base section 200 serves to control the direction of movement B and thus, in this case, specifically the direction of advance R. The gimbal connection 1801 allows the aforementioned controllability with different orientations of the longitudinal axis 101 relative to the vertical axis 201, that is, with differently inclined guide section 100. The guide section 100 is located relative to the plane of the drawing. Fig. 3 pivotally movable about the first pivot axis 1802 forwards and backwards, and out of and into the plane of the drawing about the second pivot axis 1803. In other words, the guide part 100 in the illustrated embodiment is pivotally movable in all directions.

[0137] In the Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. Figure 16 shows, by way of example, the maneuverability of the bottom section 200 via manual movement of the guide section 100 while simultaneously advancing the tool assembly 300. The explanations following the Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16 apply to surface cleaning equipment according to Fig. 2, the Fig. 3, Fig. 4 to Fig. 5 as well as the Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 likewise. Moreover, the explanations presented here also apply to the surface cleaning device 1 of the surface cleaning system 10 according to the Fig. 75, Fig. 76, Fig. 77 to Fig. 78.

[0138] Fig. Figure 12 shows a situation in which the bottom section 200 moves in a straight line along the direction of travel R over the area S to be cleaned. The guide section 100 is inclined obliquely backwards relative to the Z-axis and with respect to the direction of travel R, so that a [missing information] in the Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16. A user (not shown) in an upright position can grasp the handle 1021 and walk behind the surface cleaning device 1. Without rotating the guide section 100, there is no change in the direction of movement B, here the forward direction R, of the base section 200. Provided the forward force V is sufficiently strong, the user does not need to exert any force to move the base section 200 – at least not in the forward direction R. If the forward force V merely serves to assist a manual movement, an additional manual force in the longitudinal direction of the guide section 100 is required to move the base section 200 in the forward direction R. To change the direction of movement, the user can rotate the guide section 100 about the longitudinal axis 101. In this case, this is done by the user applying a torque to the handle 1021.

[0139] Such a situation is exemplified in Fig. Figure 13 shows that the guide element 100 was rotated counterclockwise with respect to a viewing direction along the guide element 100 towards the base element 200. This rotation of the guide element 100 causes the base element 200 to rotate counterclockwise around the vertical axis 201 on the surface S to be cleaned, so that the direction of travel R is steered to the left with respect to the aforementioned viewing direction.

[0140] Starting from the in Fig. In the situation shown in Figure 13, the user can further rotate the base part 200 to change the direction of movement by continuing to rotate the guide part 100 counterclockwise. As shown in Fig. As shown in 14, the bottom part 200 can be constructed in this way, starting from the point shown in Fig. The orientation shown in Figure 12 is rotated by at least 180° so that the direction of movement initially pointing away from the user, in this case the direction of propulsion R, now runs towards the user.

[0141] Based on the Fig. 12, Fig. 13 to Fig. 14. The maneuverability of the base section 200, as illustrated by example, is also given when the guide section 100 is inclined laterally from the vertical (see Fig. 15).

[0142] The maneuverability of the floor section 200, achieved through the gimbal connection in 1801, allows for particularly simple and efficient wet cleaning of floor surfaces S', especially along walls, as exemplified in Fig. Figure 16 shows that the surface cleaning device 1 can be guided easily and ergonomically along the wall (without reference signs) by means of a corresponding inclination of the guide part 100 and due to the thrust (thrust force V along the thrust direction R).

[0143] To enable the most complete possible absorption of the fluid discharged by the fluid outlet 400 by the fluid intake 500, it is desirable that the fluid intake 500, in this case the suction bar 501, is always positioned behind the tool assembly 300 with respect to the direction of movement of the base part 200. In other words, it is desirable that the fluid intake 500 always follows the fluid outlet 400 and / or the tool assembly 300, which would not be guaranteed, for example, if the base part 200 were simply pulled backward or moved laterally. The gimbal connection 1801, in combination with the drive of the tool assembly 300, allows for particularly easy tracking of the fluid intake 500.

[0144] In Fig. Figure 17 shows an embodiment of a fluid tank 900 according to the invention, comprising a tank volume 901, a tank inlet 902, a tank outlet 903, and a locking device 1100. The fluid tank 900 is intended for use on one of the surface cleaning devices according to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16 are planned.

[0145] The locking device 1100 is in Fig. 17 generically represented as a functional block and configured for the selective interruption of fluid recirculation through the tank volume 901. For this purpose, the locking device is configured to operate in a locked state ( Fig. 18) and transferable to a release state ( Fig. 19) In the release state, the fluid return is not interrupted, and the tank inlet 902 and the tank outlet 903 are / remain fluidly connected. In the blocking state, the blocking device 1100 causes a reversible division of the tank volume 901 into a fluid discharge tank volume 9011 and a fluid receiving tank volume 9012. In the blocking state, the tank inlet 902 and the tank outlet 903 are fluidically separated from each other by means of the blocking device 1100. The blocking device 1100 can, in principle, have any design suitable for the present purpose.

[0146] During the Fig. 18 and Fig. Further features of the locking device 1100 are shown in the specific embodiment shown in Figure 19. In particular, the locking device 1100 has a fluid control element 1101 which is configured to selectively close and open a passage 1102. In the locked state ( Fig. 18) The opening 1102 is closed by means of the fluid control element 1101. In the release state ( Fig. 19) the opening 1102 is open and the fluid receiving tank volume 9012 and the fluid discharge tank volume 9011 are fluid-conductingly connected to each other via the opening 1102.

[0147] During the Fig. 18 and Fig. In the embodiment shown in Figure 19, the locking device 1100, specifically its fluid control element 1101, is arranged in the tank volume 901. For this purpose, the fluid control element 1101 is fixed to an inner wall 913 of a tank shell 904 of the fluid tank 900.

[0148] In the embodiment shown, the fluid control element 1101 is arranged such that the tank volume 901 is divided into approximately equal partial volumes. Consequently, the fluid delivery tank volume 9011 and the fluid intake tank volume 9012 are of equal size.

[0149] In the embodiment shown, the fluid control element 1101 can be manually switched between the release state and the blocking state in a manner not shown in detail and has an actuating element for this purpose which is not shown.

[0150] In an embodiment not shown in the figures, the fluid control element 1101 is configured for automatic and / or self-activating transitions between the locked and unlocked states. For example, an automatic and / or self-activating transition can occur depending on the sensor signal 1402 of the sensor device 1401 (see Fig. 2) take place.

[0151] In Fig. Figure 20 shows a further embodiment of a fluid tank 900 according to the invention, comprising a tank volume 901, a tank inlet 902, a tank outlet 903, and a separator 1300. The separator 1300 is shown in Fig. 20 is represented as a generic functional block and is designed to separate dirt from fluid flowing through the tank volume 901 between the tank inlet 902 and the tank outlet 903. The separating device 1300 can, in principle, have any design suitable for this purpose. The separating device 1300 can, in principle, be arranged upstream, downstream, or within the tank volume 901.

[0152] In Fig. Figure 21 shows an embodiment in which the separation device 1300 comprises a filter device 1301. Alternatively or additionally to the filter device 1301, the separation device 1300 comprises a centrifugation device 1350.

[0153] The filter unit 1301 is designed to filter out dirt from the returned fluid. The centrifuge unit 1350 serves to separate the dirt by means of centrifugal forces. For this purpose, the centrifuge unit 1350 is designed to generate centrifugal forces or accelerations within the fluid. In other words, the centrifuge unit 1350 creates a fluid vortex.

[0154] In the Fig. 22 and Fig. Figure 23 shows an embodiment with a specifically designed filter assembly 1301. In the embodiment shown, the filter assembly 1301 has a first filter unit 1302 and a second filter unit 1303. In further embodiments, the filter assembly has only one filter unit or more than the two filter units shown here.

[0155] In this case, the first filter unit 1302 is arranged in the area of ​​the tank inlet 902, and the second filter unit 1303 is arranged in the area of ​​the tank outlet 903. Specifically, the first filter unit 1302 is arranged upstream of the tank inlet 902, outside the tank volume 901. The first filter unit 1302 is detachably attached, in a manner not shown in detail, to an outer wall 914 of a tank shell 904 of the fluid tank 900. Alternatively, the first filter unit 1302 can also be arranged on a tank lid of the fluid tank, for example, on the upper tank lid 907 of the [unclear text]. Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. The fluid tanks shown in Figure 11. The filter unit can, in particular, also be arranged within the tank volume or on the tank lid and within the tank volume.

[0156] The second filter unit 1303 is located within the tank volume 901. Specifically, the second filter unit 1303 is attached to a lower tank lid 908 of the fluid tank 900. The tank lid 908 serves as an end-face closure for the tank volume 901 and is detachably connected to an open end of the tank shell 904 for this purpose. A plug connection (not shown) is provided between the tank shell 904 and the (lower) tank lid 908. Attaching the second filter unit 1303 to the tank lid 908 allows for easy removal for cleaning, repair, and / or replacement.

[0157] During the Fig. 22 and Fig. In the embodiment shown in Figure 23, the two filter units 1302 and 1303 are each designed as sieve filters 1304. The mesh size of the sieve filters 1304, not shown in detail in the figures, is between 0.06 mm and 0.7 mm, preferably between 0.09 mm and 0.3 mm, and more preferably between 0.125 mm and 0.25 mm. It is understood that the first filter unit 1302 and the second filter unit 1303 can have different mesh sizes, for example, to achieve coarse and fine filtration. The mesh size of sieve filters is often also specified as a unit of measurement, mesh (US). With regard to this dimension, the mesh size of the sieve filters 1304 is in this case between mesh (US) 230 and mesh (US) 25, preferably between mesh (US) 170 and mesh (US) 50, more preferably between mesh (US) 120 and mesh (US) 60.

[0158] In Fig. Figure 24 shows a further embodiment of a fluid tank 900 according to the invention with a filter device 1301, which in turn has a first filter unit 1302 and a second filter unit 1303.

[0159] The first filter unit 1302 is located within the tank volume 901 and thus, with respect to the flow direction of the fluid through the tank 900, between the tank inlet 902 and the tank outlet 903. The first filter unit 1305 is located above an exemplary fluid level P within the tank volume 901. The first filter unit 1302 is attached to an inner wall 913 of a tank shell 904 of the fluid tank 900 by means of a fastening element 1307.

[0160] The second filter unit 1303 is similar to the embodiment according to the Fig. 22 and Fig. 23 is arranged in the area of ​​the tank outlet 903 within the tank volume 901. The second filter unit 1303 is located below the liquid level P. The in Fig. The liquid level P shown in Figure 24 is to be understood as exemplary and can of course also be higher or lower than shown.

[0161] The first filter unit 1302 is a coarse filter 1305, and the second filter unit 1303 is a fine filter 1306. The coarse filter 1305 is designed to filter out coarse dirt. Any finer dirt remaining after coarse filtration is filtered out by the fine filter 1306. When using the fluid tank 900, that is, during wet cleaning with one of the filters described above... Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. In the surface cleaning device 1 shown in Figure 16, the contaminated fluid enters the tank volume 901 through the tank inlet 902, passes through the coarse filter 1305, where coarse dirt is filtered out of the contaminated fluid. After coarse filtration, the fluid forms the liquid level P, which in this case lies below the coarse filter 1305. Upon discharge from the tank volume 901, the fluid passes through the fine filter 306, where finer dirt is filtered out.

[0162] In the embodiment shown, the coarse filter 1305 and the fine filter 1306 are each designed as sieve filters, wherein the mesh size of the coarse filter is larger than the mesh size of the fine filter.

[0163] In Fig. Figure 25 shows a further embodiment of a fluid tank 900 according to the invention with a filter device 1301. For cleaning the filter device 1301, the fluid tank 900 also has a filter cleaning device 1320. In particular, in the embodiment shown, the filter cleaning device 1320 is configured to clean a filter unit 1302 of the filter device 1301, wherein the filter unit 1302 is arranged within the tank volume 901 in the area of ​​the tank outlet 903. The filter cleaning device 1320 can have any design suitable for the present purpose and can be operated manually and / or automatically for cleaning. Filter cleaning can be carried out continuously, at predetermined regular intervals, and / or selectively by the user.The filter cleaning device 1320 prevents excessive accumulation of filtered dirt on or in the filter device 1301 and thus prevents impairment of the function of the filter device 1301.

[0164] In Fig. Figure 26 shows a further embodiment with a specifically designed filter cleaning device 1320, which in this case comprises a movable cleaning element 1321 and a motion mechanism 1322 for generating the movement of the cleaning element 1321. For the purpose of filter cleaning, the movable cleaning element 1321 acts directly or indirectly on the filter device 1301, in this case on its filter unit 1302. In different embodiments, the movable cleaning element 1321 is movable in different ways, for example, translationally, rotationally, and / or pivotally. The motion mechanism 1322 can be configured to transmit a manual drive force, a motor drive force, and / or a drive force induced by the fluid.

[0165] In Fig. Figure 27 shows an embodiment with a manually operated cleaning device 1320'. The filter cleaning device 1320' has a translationally movable filter cleaning element 1321' and a motion mechanism 1322' for translationally moving the filter cleaning element 1321'. The motion mechanism 1322' has a motion transmission element 1323', which in this case is a push-pull rod with a handle element 1324' arranged at one end. The motion transmission element 1323' is guided translationally by means of a guide device 1325'. To clean the filter device 1301, in this case specifically the filter unit 1302, the user can manually grasp the handle element 1324' and move the motion transmission element 1323', and thus also the filter cleaning element 1321' arranged at the other end, up and down along the filter unit 1302. This up-and-down movement allows the filter unit 1302 to be freed from accumulated dirt.

[0166] In Fig. Figure 27 shows the motion mechanism 1322' outside the tank volume 901. Of course, an arrangement of the motion mechanism 1322', in particular the motion transmission element 1323', within the tank volume 901 is also conceivable and possible.

[0167] In Fig. Figure 28 shows a further embodiment with a filter cleaning device 1320'', which comprises a filter cleaning element 1321'' and a movement mechanism 1322''. The filter cleaning element 1321'' is rotatably movable. The movement mechanism 1322'' can be driven by fluid forces. In particular, the movement mechanism 1322'' is configured to be driven by fluid flowing in through the tank inlet 902. The filter cleaning device 1320'' can therefore be operated without any separate action by the user.

[0168] The motion mechanism 1322'' comprises a motion transmission element 1323'' in the form of a shaft, which is rotatably mounted by means of a guide device 1325''. The motion mechanism 1322'' also comprises a drive element 1324'' in the form of a paddle wheel, which is arranged at one end of the motion transmission element 1323''. The filter cleaning element 1321'' is arranged at the other end of the motion transmission element 1323''.

[0169] The drive element 1324'' is set in rotation by the inflowing fluid. This rotation is transmitted via the motion transmission element 1323'' to the filter cleaning element 1321''. The rotary motion allows the filter device 1301, specifically the filter unit 1302, to be freed from accumulated dirt.

[0170] In Fig. 28 the movement mechanism 1322'' is arranged completely within the tank volume 901. In embodiments not shown in the figures, the movement mechanism is arranged similarly to the embodiment according to Fig. 27, arranged at least partially or sectionally outside the tank volume.

[0171] The filter cleaning elements 1321', 1321'' are each designed as a scraper element 1326', 1326''. The two scraper elements 1326', 1326'' are designed to scrape a surface 1308 of the filter assembly 1301, specifically of the filter unit 1302. By scraping the surface 1308, accumulated dirt can be removed. If the filter unit 1302 is designed as a screen filter, the aforementioned scraping action will remove dirt from its mesh.

[0172] In Fig. Figure 29 shows an embodiment of a fluid tank 900 according to the invention with a specifically designed centrifugation device 1350. The fluid tank 900 is in Fig. 29 in a simplified cross-section along a section line Q'-Q' according to Fig. 21 shown.

[0173] The centrifuging device 1350 has a fluid guide element 1351 which is configured to set the flowing fluid into rotation. The rotation of the fluid generates a centrifugal acceleration which, with respect to the plane of the drawing, Fig. 29 and the tank outlet 903, shown there as an example, are directed radially outwards. The centrifugal acceleration causes any dirt contained in the fluid to be moved radially outwards.

[0174] At the in Fig. In the embodiment shown in Figure 29, the fluid guide element 1351 is arranged in the area of ​​the tank inlet 902 and is designed in the form of a fixed inlet nozzle 1352. The inlet nozzle 1352 is directed approximately tangentially to an inner wall 913 of a tank shell 904 enclosing the tank volume 901.

[0175] In Fig. Figure 30 shows another embodiment with a centrifugation device 1350. To generate the aforementioned centrifugal acceleration, the centrifugation device 1350 again has a fluid guide element 1351. In contrast to the embodiment according to Fig. 29 is the fluid guiding element 1351 of the embodiment according to Fig. 30 movable and specifically designed as a paddle wheel 1353. The paddle wheel 1353 is rotatably mounted in the tank volume 901 by means of a rotary bearing 1354. For centrifuging the liquid, the paddle wheel 1353 is driven by a drive 1355, which is located in Fig. 30 is represented generically as a functional block and is functionally connected to the impeller 1353 in a manner not shown in detail.

[0176] The tank inlet 902 opens at the Fig. In the embodiment shown in 30, the flow is approximately radial into the tank volume 901. It is understood that, similar to the embodiment shown in 30, the flow is approximately radial into the tank volume 901. Fig. 29 A tangential inlet to the tank may also be provided, through which the rotation of the impeller 1353 can be assisted or driven without the need for the drive 1355. The centrifuging device 1350 according to Fig. The 30 can, in principle, be located at any point within the tank volume 901 between the tank inlet 902 and the tank outlet 903. The Fig. The arrangement shown in Figure 30 at the level of the tank inlet 902 is to be understood as exemplary.

[0177] In Fig. Figure 31 shows an embodiment of a fluid tank 900 according to the invention, comprising a tank volume 901, a tank inlet 902, a tank outlet 903, and a disinfection device 1500. The disinfection device 1500 is designed to disinfect the tank volume 901, can in principle have any design suitable for this purpose, and is in Fig. Figure 31 is shown as a generic functional block. The disinfection device 1500 can be arranged upstream, downstream, and / or within the tank volume 901. Furthermore, the disinfection device 1500 can be arranged on the outside or inside of the tank shell 904 of the fluid tank 900, which forms the tank volume 901. Integration of the disinfection device 1500 into the tank shell 904 is also conceivable and possible.

[0178] In Fig. Figure 32 shows a further embodiment with disinfection device 1500, wherein this has a UV light source 1501 which is configured to emit UV light 1502. The UV light 1502 can render germs harmless and thus counteract the formation of odors and putrefaction. In the Fig. In the embodiment shown in Figure 32, the UV light source 1501 is arranged outside the tank volume 901 on an outer surface of the tank shell 904 facing away from the tank volume 901. The UV light 1502 is emitted from the outside inwards through the tank shell 904 into the tank volume 901. For this purpose, in the embodiment shown, the tank shell 904 is transparent to the UV light 1502, at least in the area of ​​the UV light source 1501. In this embodiment, the UV light 1502 is emitted directly from the UV light source 1501 into the tank volume 901. In an embodiment not shown in the figure, a reflector, light guide, or the like is provided for the indirect emission of the UV light.

[0179] In the Fig. 33 and Fig. Figure 34 shows a further embodiment with a disinfection device comprising a UV light source 1501'. In contrast to the UV light source 1501 of the embodiment according to Fig. 32 The UV light source 1501' is arranged within the tank volume 901. For simplified removal from the tank volume 901, the UV light source 1501' is attached to a tank lid 908 of the fluid tank 900. The tank lid 908 serves as an end-end closure for the tank volume 901 and is detachably joined to an open end of the tank shell 904, for example by means not shown in detail. As in Fig. As shown in Figure 34, the UV light source 1501' can be removed together with the tank cap 908. This makes it particularly easy to clean, repair, or replace the UV light source 1501'.

[0180] In the Fig. 35 and Fig. Figure 36 shows an embodiment of a fluid tank 900 according to the invention, comprising a tank volume 901, a tank inlet 902, a tank outlet 903, a tank shell 904, and a connecting section 909. The connecting section 909 serves to provide a mechanical and / or fluid-conducting connection between the fluid tank 900 and a suction device 750 of the surface cleaning devices 1 according to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16.

[0181] In the illustrated embodiment, the connecting section 909 is arranged at a proximal end 910 of the tank shell 904. The tank shell 904 extends axially between the proximal end 910 and a distal end 911. The tank inlet 902 is located in the region of the proximal end 910. The tank outlet 903 is located in the region of the distal end 911.

[0182] The suction device 750 is designed in this case as a suction turbine 751. A complementary connecting section 752 is associated with the suction turbine 751. The complementary connecting section 752 serves for the mechanical and / or fluid-conducting connection with the connecting section 909 of the tank shell 904. It is understood that the connecting section of the fluid tank can also be arranged or formed on a tank lid. Therefore, a connection section directly on the tank shell is not provided for in all embodiments.

[0183] The suction turbine 751 is also associated with an intake filter 753. The intake filter 753 prevents the suction turbine 751 from drawing liquid and dirt from the tank volume. The intake filter can be part of the fluid tank's filter system.

[0184] The connecting section 909 and the complementary connecting section 752 are designed to form a detachable plug connection. It is also conceivable and possible to form a snap-fit, clamping, and / or screw connection.

[0185] In Fig. Figure 37 shows an embodiment of a fluid tank 900 according to the invention, comprising a tank volume 901, a tank inlet 902, a tank outlet 903, and a partition 1200. The partition 1200 is designed to divide the tank volume 901 into a fluid delivery tank volume 9011 and a fluid receiving tank volume 9012, with the proportions being variable. The partition 1200 can, in principle, have any design suitable for this purpose and is available in Fig. Figure 37 is shown as a generic functional block. The separating device can be arranged partially and / or sectionally inside and / or outside the tank volume 901.

[0186] The separating device 1200 is at least partially or sectionally movable relative to the tank inlet 902 and the tank outlet 903. By means of a relative movement of the separating device 1200, the fluid discharge tank volume 9011 and the fluid intake tank volume 9012 are changed with respect to their respective proportions of the total available tank volume 901. Specifically, the fluid discharge tank volume 9011 decreases while the fluid intake tank volume 9012 simultaneously increases, and / or vice versa.

[0187] The fluid-tight separation between the tank inlet 902 and the tank outlet 903, formed by the separating device 1200, can be selectively removed in preferred embodiments, similar to the situation with the shut-off device 1100. Conversely, the shut-off device 1100 can be movable within the tank volume 901 in order to change the proportions of the fluid discharge tank volume and the fluid intake tank volume to the total available tank volume.

[0188] The movement of the separating device 1200 for changing the proportions of the fluid discharge tank volume 9011 and the fluid intake tank volume 9012 of the total available tank volume 901 can be driven manually, by motor and / or automatically.

[0189] In the Fig. 38, Fig. 39 and Fig. Figure 40 shows an embodiment with a specifically designed separating device comprising a separating element 1201. The separating element 1201 rests against an inner wall 913 of the fluid tank 900 in a relatively movable and fluid-tight manner. A relative movement of the separating element 1201 along the inner wall 913 causes the proportions of the fluid discharge tank volume 9011 and the fluid receiving tank volume 9012 to be changed in relation to the total available tank volume 901.

[0190] In Fig. Figure 38 shows a first situation in which the separating element 1201 occupies a first position. In this first position, a first liquid level P1 exists in the fluid delivery tank volume 9011. The fluid receiving tank volume 9012 is empty, that is, it has no liquid level.

[0191] The outflow of fluid from the fluid delivery tank volume 9011 reduces the first fluid level P1 to a second fluid level P2 ( Fig. 39). By the outflow of fluid through the tank outlet 903 and / or the inflow of fluid through the tank inlet 902, the separating element 1201 is moved from its first position ( Fig. 38) moved to a second position ( Fig. 39). In this second position of the separating element 1201, there is a reduced fluid discharge tank volume 9011' and an increased fluid receiving tank volume 9012'. In the increased fluid receiving tank volume 9012', the inflowing fluid has formed a third fluid level P3.

[0192] In Fig. Figure 40 shows a third situation in which the separating element 1201 assumes a third position, with a further reduced fluid discharge tank volume 9011'' and a further increased fluid receiving tank volume 9012''. In the third situation shown, the further reduced fluid discharge tank volume 9011'' is completely empty, i.e., it has no liquid level. In the further increased fluid receiving tank volume 9012'', the inflowing fluid has formed a fourth liquid level P4.

[0193] Assuming that a (theoretically) complete return of the discharged and absorbed fluid takes place over the duration of the wet cleaning process, the liquid volume of the first liquid level P1 corresponds to a liquid volume of the fourth liquid level P4.

[0194] During the Fig. 38, Fig. 39 and Fig. In the embodiment shown in Figure 40, the separating element 1201 is translationally movable. Specifically, the separating element 1201 is translationally movable along a longitudinal axis 912 of the fluid tank.

[0195] The separating element 1201 is in this case translationally movable between the said first position and the third position over a distance which corresponds to 70% of an axial total length of the tank volume 901 and / or an axial distance between the tank inlet 902 and the tank outlet 903.

[0196] In Fig. Figure 41 shows further details of the separating element 1201. Specifically, the separating element 1201 has a base body 1202 and, in this case, two sealing elements 1203, 1204, which are specifically designed as sealing rings. In the embodiment shown, the base body 1202 of the separating element 1201 is plate- or disc-shaped. In other words, the base body is flat with respect to the longitudinal axis 912. The two sealing elements 1203, 1204 are spaced apart from each other along the longitudinal axis 912 and are arranged on an outer contour of the base body 1202, which is not further specified. The two sealing elements 1203, 1204 serve to provide a fluid-tight seal and guide the separating element on the inner wall 913 of the fluid tank 900. The axial distance between the two sealing elements 1203, 1204 prevents the separating element 1201 from tilting with respect to the longitudinal axis 912 and achieves improved movement guidance.

[0197] In the Fig. 42, Fig. 43, Fig. Figure 44 shows further embodiments with movable separating elements 1201', 1201'', 1201''' for the proportionally variable separation of the tank volume 901.

[0198] In contrast to the separating element 1201 of the embodiment according to the Fig. 38, Fig. 39 to Fig. 40 the separating element 1201' is not axially movable, but transversely to the longitudinal extent of the fluid tank.

[0199] The separating element 1201'' of the embodiment according to Fig. 43 is pivotable about an unspecified pivot axis.

[0200] The separating element 1201''' of the embodiment according to Fig. 44 itself acts as a kind of container and is buoyant on a liquid level P located in the tank volume 901. If the liquid level P drops, the position of the separating element 1201''' changes and the volume available for receiving fluid flowing into the tank increases.

[0201] In Fig. Figure 45 shows a separating device 1200 for a fluid tank according to the invention, wherein the separating device 1200 comprises a movable separating element 1201 and a locking device 1100. The basic function and possible design of the movable separating element 1201 are described in relation to the Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43 to Fig. 44 Revealed.

[0202] The locking device 1100 of the disconnecting device 1200 serves to selectively deactivate the disconnecting function of the disconnecting device 1200. For this purpose, the disconnecting device 1100 can be switched between a connected state and a disconnected state.

[0203] In the separation state, the fluid-tight separation between the tank inlet 902 and the tank outlet 903 and the associated proportional division of the tank volume 901 into the fluid discharge tank volume 9011 and the fluid intake tank volume 9012 is / remains maintained.

[0204] In the release state, this separation / division is eliminated and the tank inlet 902 is fluid-conductingly connected to the tank outlet. In this way, the Fig. 45 The combination of movable separating device 1200 and locking device 1100 shown allows for the optional cancellation of fluid recirculation and a change in the proportions of the fluid discharge tank volume 9011 and the fluid intake tank volume 9012 to the total available tank volume 901.

[0205] In Fig. Figure 46 shows a specific embodiment in which the locking device 1100 is integrated into the movable separating element 1201. Specifically, the locking device 1100 has a fluid control element 1101 by means of which a passage (not shown) of the separating element 1201 can be selectively opened and released.

[0206] In Fig. Figure 47 shows a further specific embodiment of a separating device 1200. The separating device 1200 again has a movable separating element 1201. In addition, the separating device 1200 has, according to Fig. 47 A locking device 1100, specifically with a fluid control element 1101, a separation device 1300, specifically with a filter device 1301 and / or a centrifugation device 1350, a detection device 1400, specifically with a sensor device 1401, and / or a disinfection device 1500, specifically with a UV light source 1501. The locking device 1100, the separation device 1300, the detection device 1400, and the disinfection device 1500 can be provided alternatively or in any combination. Preferably, the respective devices 1100, 1300, 1400, and 1500 are arranged or formed on the movable separating element 1201 and are thus movable together with the separating element 1201 when it is moved.Regarding possible further features of the barrier device 1100, the separator device 1300, the detection device 1400, and the disinfection device 1500, reference is made to the previously disclosed information concerning these devices. Further specific features of the separation device 1200, in particular of the separation element 1201, will become apparent in combination with the aforementioned previous disclosure.

[0207] In the Fig. 48, Fig. 49 and Fig. Figure 50 shows a further embodiment of a fluid tank 900 according to the invention, comprising a tank volume 901, a tank inlet 902, a tank outlet 903, and a separation device with a separating element 1210. The separating element 1210 serves to change the proportions of the total available tank volume 901 that are available for the discharge and intake of fluid.

[0208] Specifically, the separating element 1210 is elastically deformable and fluid-tight, fixed to a tank shell 904 of the fluid tank. The elastically deformable separating element 1210 creates a fluid-tight separation between the tank inlet 902 and the tank outlet 903.

[0209] In the Fig. 48, Fig. 49 and Fig. Figure 50 shows the elastically deformable separating element 1210 in different deformation states. In a first deformation state ( Fig. 48) The tank volume 901 is divided by means of the separating element 1210 into a fluid delivery tank volume 9011 and a fluid intake tank volume 9012. In a second deformation state ( Fig. 49) is the separator element 1210 with respect to the character level of the Fig. 48, Fig. 49 to Fig. 50° elastically deflected to the left, resulting in a reduced fluid discharge tank volume 9011' and an increased fluid intake tank volume 9012'. In a third deformation state ( Fig. 50) the separating element 1210 is deflected even further elastically, resulting in a further reduced fluid discharge tank volume 9011'' and a further increased fluid intake tank volume 9012''.

[0210] In the embodiment shown, the elastic deformation of the separating element 1210 is caused by an outflow of fluid from the tank outlet 903 and / or an inflow of fluid through the tank inlet 902.

[0211] In the specific design according to the Fig. 48, Fig. 49 to Fig. 50 is the elastically deformable separating element 1210 a sealing membrane 1211.

[0212] It goes without saying that the in relation to Fig. 47 functions of the blocking device 1100, the separating device 1300, the detection device 1400 and / or the disinfection device 1500 can also be integrated into the elastically deformable separating element 1210.

[0213] In the Fig. 51 and Fig. Figure 52 shows a further embodiment of a fluid tank 900 according to the invention, comprising a tank volume 901, a tank inlet 902, and a tank outlet 903. The fluid tank 900 according to the Fig. 51 and Fig. 52 features a specifically designed tank shell 904. Specifically, the tank shell 904 is a hollow cylinder 905. The hollow cylinder 905 can, in principle, have any cross-sectional shape, for example, an angular, convex-concave, round, or oval cross-sectional shape. The cross-sectional shape can vary along the tank shell. In the specific design according to the Fig. 51 and Fig. 52 The hollow cylinder 905 has an annular cross-sectional shape and is therefore a tube 906, more precisely: a circular tube.

[0214] The tank shell 904 is extended axially along a longitudinal axis 912 between a proximal end 910 and a distal end 911. The tank shell 904 is located in the Fig. 51 and Fig. In the embodiment shown in Figure 52, the tank shell is closed at the proximal end 910 and at the distal end 911. However, the tank shell can also be open at at least one of the ends 910, 911 and be closable by means of a tank cap. A design of the tank shell 904 that is open axially on both sides and can be closed with tank caps is preferred. The hollow cylinder 905, and in particular the tube 906, are therefore preferably open axially on both sides.

[0215] According to Fig. 51 The tank inlet 902 and the tank outlet 903 are formed and / or arranged directly on the tank shell 904. However, if the fluid tank has tank caps attached to the end face of the tank shell, the tank inlet and / or the tank outlet can also each be formed on one of the tank caps.

[0216] The one in the Fig. 51 and Fig. The fluid tank 900 shown in Figure 52 has a total available tank volume 901 of 1.5 liters. In other embodiments not shown in the figures, the tank volume is a maximum of 10 liters and a minimum of 0.5 liters.

[0217] According to Fig. 52 the tank shell 904 is made of a transparent material T, which is specifically a plastic K.

[0218] The tank shell 904 can, in principle, be designed as a single piece or in multiple parts. A multi-part design, as used in the [reference to a specific document / section], is preferred. Fig. 53 and Fig. 54 is shown.

[0219] According to Fig. In Figure 53, the fluid tank 900, specifically the tank shell 904, is assembled from several parts 9041, 9042, 9043, and 9044. These several parts 9041 to 9044 are hollow cylinder sections, specifically pipe sections. Depending on the configuration, these several parts 9041 to 9044 are joined in different ways, for example, by plug-in, snap-fit, clamping, screw, or other connection methods. The joints between the several parts 9041 to 9044 can be permanent or detachable.

[0220] During the Fig. 53 and Fig. In the embodiment shown in Figure 54, a plug connection is formed between each immediately adjacent part, so that a total of three plug connections 914, 915, 916 are present. The plug connections 914, 915, 916 are detachable and therefore allow easy disassembly and reassembly of the fluid tank 900. This allows any internal components of the fluid tank located within the tank volume 910, such as one of the aforementioned devices (locking device 1100, separating device 1200, separating device 1300, detection device 1400, disinfection device 1500), to be easily removed. This also simplifies cleaning. Furthermore, the total available tank volume can be increased by increasing the number of parts used or decreased by removing one or more parts. The volume of the fluid tank 900 is determined according to Figure 54. Fig. 53 and Fig. 54 available tank volumes from the sum of the partial volumes 9013 to 9016 of the several parts 9041 to 9044.

[0221] It goes without saying that the characteristics of the fluid tanks are determined according to the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. 54 and the fluid tanks according to the Fig. 68, 69 and 72 to 74 can be combined with one another as desired to form further embodiments according to the invention. For example, those relating to the Fig. 51, Fig. 52, Fig. 53 to Fig. 54 explained features without further ado regarding the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49 to Fig. The information provided for the 50 fluid tanks is transferable and vice versa. Furthermore, it is understood that the individually described features of the fluid tanks are, according to the... Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49 to Fig. 50, that is, the blocking device 1100, the separating device 1200, the separating device 1300, the detection device 1400 and the disinfection device 1500, can of course also be present in any combination on one and the same fluid tank.

[0222] It is further pointed out that the in the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. The elongated shape of the fluid tanks shown in Figure 54 is to be understood as exemplary. This elongated shape offers particular advantages when the fluid tank is to be attached to the guide section of the surface cleaning device or carried on the support device. If the fluid tank is also to be attached to the base of the surface cleaning device, a shape differing from that shown in the figures will generally be advantageous, for example, a less elongated, more compact, and / or flatter shape.

[0223] In Fig. Figure 55 shows a schematic side view of a surface cleaning device 1a. The surface cleaning device 1a has a longitudinally extended guide section 100a, a base section 200a, a tool assembly 300a, a fluid discharge 400a, and a fluid intake 500a. Furthermore, the surface cleaning device 1a has separate, fluidically unconnected tanks for receiving fresh water and wastewater, namely a fresh water tank 80 and a wastewater tank 90. ​​The fresh water tank 80 and the wastewater tank 90 are each attached to the longitudinally extended guide section 100.

[0224] The fresh water tank 80 has a tank outlet 81 which is connected to the fluid discharge 400a via a fluid path not otherwise specified. A pumping device 701 is arranged in said fluid path for the purpose of pumping fresh water.

[0225] The wastewater tank 90 has a tank inlet 91, which is connected to the fluid intake 500a via a further, unspecified, separate fluid path. The wastewater tank 90 also has an opening 92, which is fluid-conducting and connected to a suction device 750. To receive wastewater, the suction device 750 draws air from inside the wastewater tank 90 through the opening 92. The resulting negative pressure causes wastewater to be drawn from the fluid intake 500a, via the fluid path, through the tank inlet 91 and into the wastewater tank 90.

[0226] The cleaning result and cleaning speed are limited by the available amount of fresh water in the fresh water tank 80 and the maximum amount of dirty water that can be absorbed in the dirty water tank 90.

[0227] In Fig. Figure 56 shows a conversion of the surface cleaning device 1a into a surface cleaning device 1a' with a fluid circuit. For the conversion, the fresh water tank 80 and the dirty water tank 90 are removed from the guide section 100a. Existing fluid-conducting connections of the fresh water tank 80 and the dirty water tank 90 with the aforementioned separate fluid paths are disconnected. Alternatively, it is conceivable and possible to remove only one of the two separate tanks 80, 90. A fluid tank 900' according to the invention, with a tank volume 901, a tank inlet 902, and a tank outlet 903, is then attached to the guide section 100a. The tank inlet 902 is fluid-conductingly connected to the fluid intake 500a. The tank outlet 903 is fluid-conductingly connected to the fluid discharge 400a. An opening (without reference numeral) of the fluid tank 900' is connected fluid-conducting to the suction device 750.

[0228] The functional blocks (without reference numbers) shown in tank volume 901 illustrate that the fluid tank 900' has one or more of the following features, referenced in the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. 54 explained devices may be available, in particular a blocking device 1100, a separation device 1200, a separating device 1300, a detection device 1400 and / or a disinfection device 1500. In addition, an additive device 1450 may be present.

[0229] In Fig. Figure 57 shows an arrangement comprising an embodiment of a fluid tank 900 according to the invention, an additional tank 950, a fluid control element 960 and a pumping device 701.

[0230] The fluid tank 900 has a tank volume 901, a tank inlet 902, and a tank outlet 903. The tank inlet 902 is for fluid-conducting connection to a fluid intake of one of the surface cleaning devices according to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16 is set up. The tank outlet 903 is fluid-conductingly connected to the fluid control element 960.

[0231] The auxiliary tank 950 has an auxiliary tank volume of 951 and is fluid-conductingly connected to the fluid control element 960.

[0232] The fluid control element 960 serves to control the fluid discharge from the fluid tank 900 and the auxiliary tank 950 and is controllable between different states for this purpose.

[0233] In a first state of the fluid control element 960, the tank outlet 903 is fluid-conductingly connected to the pumping device 701, so that fluid located in the tank volume 901 can be pumped out of the fluid tank 900 via the tank outlet 903 for delivery to a surface to be cleaned. In the first state of the fluid control element 960, the auxiliary tank volume is closed towards the pumping device 701; no fluid is discharged from the auxiliary tank 950.

[0234] In the second state of the fluid control element 960, the auxiliary tank volume 951 is fluid-conductingly connected to the pumping device 701, so that fluid from the auxiliary tank 950 can be dispensed onto the surface to be cleaned. In the second state, the tank outlet 903 is not connected to the pumping device 701, so that no fluid can be dispensed from the fluid tank 900.

[0235] In a third state of the fluid control element 960, the tank volume 901 and the auxiliary tank volume 951 are fluid-conductingly connected to the pumping device 701, so that a combined discharge of fluid from the fluid tank 900 and from the auxiliary tank 950 can take place.

[0236] In the illustrated embodiment, the fluid control element 960 is continuously controllable between the aforementioned states. This allows a continuous mixing of fluid from tank volume 901 with fluid from the auxiliary tank volume 951.

[0237] The arrangement according Fig. 57 is intended for use on one of the surface cleaning devices and / or surface cleaning systems disclosed.

[0238] The 950 auxiliary tank allows for the stepless addition of substances such as fresh water or an additive. This results in even better cleaning performance.

[0239] In Fig. Figure 58 shows an embodiment of a surface cleaning system 10 according to the invention. Fig. Figure 58 shows the surface cleaning system 10 in a simplified block diagram.

[0240] The surface cleaning system 10 comprises an embodiment of a surface cleaning device 1 according to the invention, for example one of the surface cleaning devices according to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16.

[0241] In the illustrated embodiment, the surface cleaning device 1 comprises a tool assembly 300, a fluid dispensing unit 400, a fluid intake 500, a fluid path 600, and a conveying unit 700. For the function and basic design of these components of the surface cleaning device 1, reference is made to the preceding disclosure. In the present case, the surface cleaning device 1 also comprises a fluid reservoir 800, which is specifically designed as a fluid tank 900.

[0242] The surface cleaning device 1 is, in this case, a scrubber-dryer 1' and is designed for wet scrubbing a surface S to be cleaned. The surface S to be cleaned is, in this case, a floor surface S', for example, a floor surface in a building.

[0243] Due to the specific design of the surface cleaning device 1, the surface cleaning system 10 can also be referred to as a scrubber-dryer 1' or scrubber-dryer system 10'.

[0244] The surface cleaning system 10 further comprises a base station 2000, which is designed to accommodate the surface cleaning device 1 and includes a fluid system 2100. In the embodiment shown, the base station 2000 also includes an optional holding device 2200 and an optional propulsion device 2300.

[0245] The fluid unit 2100 is designed for emptying, filling, and / or rinsing the fluid path 600, specifically the fluid tank 900, of the surface cleaning device 1. The emptying, filling, and / or rinsing preferably occurs automatically without direct user intervention. In this case, the emptying, filling, and / or rinsing is accomplished via a fluid connection unit 2100. The fluid connection unit 2100 is designed for automatic fluid-conducting connection to the fluid path 600. This connection can be established via the fluid outlet 400, the fluid inlet 500, a designated opening in the fluid tank 900, and / or any other connection point on the fluid path 600.

[0246] In the embodiment shown, the fluid device 2100 also has a tank device 2120, which can be fluidly connected to the surface cleaning device 1 by means of the fluid connection device 2110.

[0247] The tank system 2120 comprises a wastewater tank 2121, a fresh water tank 2122, and a rinse water tank 2123. The wastewater tank 2121 serves to collect and subsequently dispose of wastewater from the fluid path 600, specifically fluid tank 900, of the surface cleaning device 1. The fresh water tank 2122 serves to refill the fluid path 600, specifically fluid tank 900, with fresh water. The rinse water tank 2123 serves to rinse the fluid path 600, specifically fluid tank 900, with rinse water or another rinsing fluid.

[0248] The holding device 2200 is designed for detachable mechanical coupling with a designated section of the surface cleaning device 1. In embodiments with a guide section and / or base section, the holding device 2200 is preferably designed for mechanical coupling with the guide section and / or base section. The holding device 2200 serves to detachably secure the surface cleaning device 1 to the base station 2000. The holding device 2200 also prevents the unintentional loosening of the fluid-conducting connection between the fluid connection device 2110 and the fluid path 600, specifically the fluid tank 900, of the surface cleaning device 1.

[0249] The propulsion device 2300 enables manual or motorized movement of the base station 2000. In a particularly simple design, the propulsion device 2300 features transport rollers, drive wheels, or the like. The propulsion device 2300 allows for easy repositioning of the base station 2000 on or relative to the surface to be cleaned. Specifically, the user can move the base station 2000 along with the surface cleaning device 1 or reposition it from time to time. The surface cleaning device 1 can be moved together with the base station 2000 while attached to it and / or held in place by the holding device 2200.In an embodiment not shown in the figures, the propulsion device is set up to autonomously track the base station, so that the base station follows the surface cleaning device at a distance during its use.

[0250] In Fig. Figure 59 shows an embodiment of a method 3000 according to the invention for wet cleaning a surface using a surface cleaning device, which is preferably a surface cleaning device 1 according to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15 to Fig. 16. Fig. Figure 59 shows the procedure 3000 in a simplified block representation.

[0251] Procedure 3000 includes steps 3100, 3200, 3300 and 3400.

[0252] In step 3100, fluid is dispensed onto the surface to be cleaned. This is done via a fluid dispenser on the surface cleaning device.

[0253] In step 3200, the previously dispensed fluid is collected from the surface by means of a fluid intake on the surface cleaning device.

[0254] In step 3300, the previously collected fluid is conveyed by a conveying device of the surface cleaning unit. The fluid is conveyed along a fluid path of the surface cleaning unit, which connects the fluid intake for returning the collected fluid with the fluid discharge.

[0255] In step 3400, the recycled fluid is released onto the surface via the fluid discharge.

[0256] Embodiments of the method according to the invention are directly and unambiguously apparent from the preceding disclosure relating to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53, Fig. 54, Fig. 55, Fig. 56, Fig. 57 to Fig. 58. For example, embodiments of the method according to the invention may include at least one of the following steps: Separation of dirt from the collected fluid by means of a separation device of the surface cleaning device, in particular by means of a filter device and / or a centrifugation device; disinfection of a section of a fluid path of the surface cleaning device, in particular of a fluid tank, by means of a disinfection device of the surface cleaning device, in particular by the emission of UV light by means of a UV light source; detection of the degree of contamination of the collected fluid by means of a detection device of the surface cleaning device, in particular a sensor device; blocking of the fluid return by means of a blocking device of the surface cleaning device; manual guidance of the surface cleaning device over the surface to be cleaned, in particular by means of a guide part of the surface cleaning device;Controlling the direction of movement of the surface cleaning device, wherein, for the purpose of control, a guide element is rotated about its longitudinal axis in order to rotate a base part of the surface cleaning device about its vertical axis and resting on the surface to be cleaned; generating a propulsion to support or effect the movement of the surface cleaning device, wherein the propulsion is generated by means of a tool device and / or a propulsion device of the surface cleaning device.

[0257] It is understood that the foregoing list of further optional process steps is not exhaustive. Further optional process steps and further details of the optional process steps already mentioned by way of example will follow from the description of the surface cleaning devices, the fluid tanks, the surface cleaning system according to the invention, and the disclosure of the respective embodiments.

[0258] In Fig. Figure 60 shows an embodiment of a filter device 1301 according to the invention.

[0259] The filter unit 1301 is particularly suitable for the surface cleaning devices disclosed and / or as a component of the fluid tanks disclosed. The filter unit 1301 according to Fig. 60 can, for example, replace or additionally the one referring to the Fig. 2, 3 to 5 as well as 6 to 11 and 20 to 28 disclosed separation devices, in particular filter devices, are used.

[0260] The filter assembly 1301 comprises at least one filter unit 1302, an optional support structure 1310, an optional filter cleaning device 1320, and an optional additive ZM. Consequently, the support structure 1310, the filter cleaning device 1320, and the additive ZM are not present in all embodiments of the filter assembly 1301.

[0261] The at least one filter unit 1302 is designed to be arranged in the fluid path 600 of the surface cleaning device and / or fluid tanks concerned and to filter the liquid F flowing along the fluid path 600.

[0262] At the in Fig. In the embodiment shown in Figure 60, the filter device 1301 has only a single filter unit 1302. In other embodiments, several identical or different filter units are provided (see, for example, Figure 60). Fig. 22, Fig. 23 to Fig. 24). For the sake of brevity, only filter unit 1302 will be referred to below. What has been said about filter unit 1302 also applies, mutatis mutandis, to any other filter units.

[0263] The filter unit 1302 serves to reduce the degree of contamination of the liquid used for wet cleaning and is designed to filter out dirt particles, small parts, lint, hair or the like from the liquid.

[0264] In one configuration, the filter unit 1302 is a consumable item that is disposed of and replaced after reaching a predetermined usage level, for example, a maximum service life. Alternatively, the filter unit 1302 can be designed to be used for the entire service life of the relevant surface cleaning device and / or fluid tank.

[0265] The filter unit 1302 has according to Fig. 61 a rigid filter medium 1309, a flexible filter medium 1309' and / or a loose filter medium 1309''. The said filter media 1309, 1309', 1309'' can be present individually or in combination and can be configured into different filter designs.

[0266] In Fig. Figure 61 shows, as examples, different filter designs 13021 to 13028, each schematically represented as a simplified functional block. These filter designs are a sieve filter 13021, a pore filter 13022, a filter cartridge 13023, a paper filter 13024, a fabric filter 13025, a fleece filter 13026, a packed bed filter 13027, and a wire mesh filter 13028.

[0267] The filter unit 1302 in this case has at least one of the aforementioned filter designs 13021 to 13028. Combined filter designs are also conceivable and possible. In one embodiment, the filter assembly 1301 has several filter units, each in a different filter design.

[0268] At least one filter unit 1302 can be made of metal, plastic, paper and / or ceramic. Combinations of the aforementioned materials are, of course, also conceivable and possible.

[0269] In the embodiment shown, the aperture size of at least one filter unit 1302, specifically of the filter media 1309, 1309', 1309'' and / or the filter designs 13021 to 13028, is between 1 µm and 50 µm. A range of values ​​between 5 µm and 30 µm has proven advantageous. Particular advantages are achieved with an aperture size between 10 µm and 20 µm.

[0270] The in Fig. The support structure 1310, shown schematically as a functional block in Figure 60, serves as a support, holder, and / or prop for the filter unit 1302. The filter unit 1302 is held by the support structure 1310. The optional support structure 1310 is particularly advantageous when the filter unit 1302 has a conformable filter medium 1309' and / or a loose filter medium 1309''. The support structure 1310 can also serve to fasten and / or attach the filter unit 1302 to a designated location in the fluid path 600 and / or fluid tank 900. The filter unit 1302 can be detachably or permanently connected to the support structure 1310.

[0271] If the support structure is inextricably connected to the filter unit, they together can form a consumable item that needs to be replaced.

[0272] The in Fig. The optional filter cleaning device 1320, shown schematically as a functional block in Figure 60, serves to clean at least one filter unit 1302. The optional filter cleaning device 1320 can, for example, be used instead of or in addition to the filter unit 1302 described in Figure 60. Fig. 25, Fig. 26, Fig. 27 to Fig. The 28 described filter cleaning devices are used.

[0273] The filter cleaning device 1320 allows the cleaning of at least one filter unit 1302 before, during, and / or after operation of the surface cleaning device. Cleaning the filter unit 1320 removes dirt from it, thus preventing clogging of the filter unit 1302. Depending on the design of the filter cleaning device, it may even prevent dirt from accumulating in the first place.

[0274] As already mentioned with reference to the Fig. 25, Fig. 26, Fig. 27 to Fig. As explained in section 28, the filter cleaning device 1320 can, in principle, be configured for manual and / or automatic cleaning of the filter unit 1302. The cleaning itself can be carried out in different ways, for example by wiping the filter unit 1302, by vibrating the filter unit 1302, and / or by backwashing the filter unit 1302.

[0275] At the in Fig. In the exemplary embodiment of the filter cleaning device 1320 shown in Figure 62, this device includes a scraper 1330, a vibration device 1370 and / or a backwash device 1390. The scraper 1330, the vibration device 1370 and the backwash device 1390 can be present individually or in combination.

[0276] The scraper device 1330 is designed to scrape a surface of at least one filter unit 1302. Specific embodiments of the filter cleaning device as a scraper device have already been described with reference to the Fig. 27 and Fig. 28 has been explained. Furthermore, additional specific features of the scraper device 1330 are described below with reference to the design according to Fig. 69 explained.

[0277] The in Fig. The vibration device 1370, shown schematically as a functional block in Figure 62, is designed to vibrate at least one filter unit 1302. The vibrations generated by the vibration device 1370 shake off dirt adhering to or within the filter unit 1302. For this purpose, the vibration device 1370 can act directly or indirectly on the filter unit 1302 and / or the optional support structure 1310.

[0278] These vibrations can be generated as vibrations, sound, and specifically ultrasound. A specific design of a vibration device will be described below with reference to... Fig. 72 explained.

[0279] In one embodiment, the vibration device is alternatively or additionally configured to set the scraping device, in particular the at least scraping element or the liquid surrounding or flowing around the filter unit, in motion, in particular into vibration.

[0280] The in Fig. The backwashing device 1390, shown schematically as a functional block in Figure 62, is designed for backwashing the filter unit 1302. The backwashing device 1390 can, in principle, have any design suitable for this purpose. Backwashing allows dirt accumulated on and / or in the filter unit 1302 to be flushed out. Backwashing is performed against the usual flow direction of the liquid along the fluid path 600 and can take place before, during, and / or after operation of the surface cleaning device. For backwashing purposes, the backwashing device 1390 can have a separate pumping unit. Alternatively or additionally, the pumping unit of the surface cleaning device in question can be used (see, for example, pumping unit 700). Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11).

[0281] The in Fig. The optional additive ZM, shown schematically as a functional block in Figure 60, is designed for release into the liquid flowing along the fluid path 600 and can also be referred to as an additive substance, additive, and / or additive. The additive ZM has an effect that, in the broadest sense, supports improved surface cleaning and / or improved function of the surface cleaning device and / or the filter unit 1301 in question.

[0282] In Fig. Figure 63 schematically shows that the additive ZM can, in principle, exist as a solid additive ZMa, a liquid additive ZMb, and / or a gaseous additive ZMc. In other words, the additive ZM can exist as a solid, liquid, and / or gas. Combined additives that are partly solid, partly liquid, and / or partly gaseous are also conceivable and possible.

[0283] The additive ZM can have various effects, such as cleaning, disinfecting, descaling, coloring, deodorizing, and / or clarifying. Depending on its effect, the additive ZM can therefore also be described as a cleaning agent, disinfectant, descaling agent, coloring agent, deodorizing agent, and / or clarifying agent.

[0284] It is understood that the filter device 1301 may contain several similar or different additives.

[0285] At the in Fig. In the embodiment shown in Figure 64, the additive ZM is soluble and bound in an additive body ZMK. The additive body ZMK is, in the broadest sense, associated with the filter unit 1302. For example, the additive body ZMK can be received, attached, held, or otherwise mounted on the filter unit 1302 at a designated location. The additive ZM bound in the additive body ZMK is dissolved from the additive body ZMK and released into the liquid by the fluid flowing along the fluid path 600. Over time, the additive body may partially or completely dissolve.

[0286] The additive body ZMK can be in the form of, for example, a capsule ZMK1, a tablet ZMK2, and / or a cushion ZMK3. This is shown schematically simplified in the following. Fig. 63 illustrates this.

[0287] At the in Fig. In the schematically shown embodiment 65, the additive ZM is soluble and bound in the filter unit 1302. During operation of the filter device, the additive ZM is dissolved from the filter unit 1302 by the action of the liquid flowing through it and released into the liquid.

[0288] In one embodiment, the additive ZM is applied as a coating or layer to and / or into the filter unit 1302. Alternatively or additionally, the filter unit 1302 can be impregnated, saturated, or otherwise equipped with the additive ZM.

[0289] In Fig. Figure 66 shows an exemplary embodiment of a kit for forming a filter unit 1301, wherein the kit in the specific embodiment shown here has several different filter units 1302, 1302', 1302'', 1302''' and several different additive bodies ZMK, ZMK', ZMK'', ZMK'''.

[0290] The kit can also be referred to as a set or assembly kit and is intended for joint use with a surface cleaning device and / or fluid tank, in particular with one of the surface cleaning devices according to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 and / or fluid tanks according to the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. 54.

[0291] Depending on the cleaning task, a user can select a suitable filter unit and an appropriate additive body from the kit and attach them to a designated point on the fluid path 600 and / or fluid tank 900 of the relevant surface cleaning device.

[0292] The different filter units 1302, 1302', 1302'', 1302''' may differ in their opening width and / or filter design. The different additive bodies ZMK, ZMK', ZMK'', ZMK''' may differ in the type of additive used, its effect, and / or dosage.

[0293] In one configuration not shown in the figures, the kit comprises only one filter unit and one additional component. In another configuration not shown, the kit includes several identical filter units. Alternatively or additionally, the kit may include several identical additional components.

[0294] In Fig. Figure 67 schematically shows a specific embodiment of an additive device 1450. In the embodiment shown, the additive device 1450 has an additive container 1451 and a dispensing device 1425.

[0295] The additive device 1450 comprises at least one additive ZM, which, in the illustrated embodiment, is contained in the additive container 1451. Regarding the properties, effects, and other characteristics of the additive ZM, reference is made to the preceding disclosure, and express reference is made to it. What has been said there concerning the additive ZM of the filter device 1301 also applies mutatis mutandis to the additive ZM of the additive device 1450.

[0296] The additive container 1451 is used to store the additive ZM. Depending on whether the additive ZM is liquid, solid and / or gaseous, the additive container 1451 has properties adapted accordingly.

[0297] In the illustrated embodiment, the additive device 1450 comprises only one additive ZM. In a further embodiment, several identical or different additives may be present. In this case, each of the additives may be contained in a separate additive container.

[0298] In principle, the additive container 1451 can be attached to or attachable to various components of the surface cleaning device. In one embodiment, the additive container 1451 is attached to or attachable to a fluid tank of the surface cleaning device. In another embodiment, the additive container 1451 is attached to or attachable to a guide element of the surface cleaning device. Attachment to a base element of the surface cleaning device is also conceivable and possible. In surface cleaning systems with a surface cleaning device and a robotic attachment, the additive system, including the additive container, can also be attached to or attachable to the robotic attachment.

[0299] The in Fig. The dispensing device 1452, shown schematically as a functional block in Figure 67, is designed to dispense the additive ZM from the additive container 1451 into the fluid path 600. Alternatively or additionally, the additive ZM can be dispensed directly onto the surface to be cleaned using the dispensing device 1452.

[0300] The dispensing device 1452 is configured for manual operation by a user. In another configuration, the dispensing device 1452 provides for the automatic and / or automated dispensing of the additive ZM.

[0301] The dispensing device 1452 is designed for the metered dispensing of the additive ZM in preferred configurations.

[0302] In configurations with multiple additive containers, the additive device preferably has multiple dispensing devices, with each of the multiple additive containers preferably being assigned one of the multiple dispensing devices.

[0303] In Fig. Figure 68 shows a further embodiment of a fluid tank 900. The fluid tank 900 has a tank inlet and a tank outlet (in Fig. (68 not shown in each case), a tank volume 901 and a tank shell 904. The tank shell 904 is in Fig. 68 is shown truncated in the proximal direction, i.e., upwards. At its lower end, the fluid tank 900 is openably closed with a lower tank cover 908 and detachably supported on a lower housing assembly 105. The lower housing assembly 105 can, for example, be part of a guide element 100 of the surface cleaning devices according to the Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 (see, for example) Fig. 6, Fig. 7, Fig. 8).

[0304] For the basic structure and fundamental function of the Fluidtank 900, reference is made to the previously described fluid tanks according to the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. 54 disclosed references. The characteristics of the fluid tanks according to the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. 54 are equipped with the features of the Fluidtank 900 according to Fig. 68 can be combined with further feature combinations.

[0305] The fluid tank 900 has a filter unit 1301, which is located in Fig. 68 covered and in the section view according to Fig. 69 is shown in detail.

[0306] The filter unit 1301 according to Fig. In the illustrated embodiment, component 69 is arranged in the tank volume 901 in a manner described in more detail below. An arrangement away from the tank volume 901 is also conceivable and possible, for example upstream of the tank inlet or downstream of the tank outlet. In principle, the arrangement shown in Fig. 69 filter device 1301 shown also away from the fluid tank 900 at a designated and suitable point in the fluid path of the surface cleaning device or surface cleaning system in question (see Fig. 75, Fig. 76, Fig. 77 to Fig. 78) are ordered.

[0307] The filter assembly 1301 is held in place by the lower tank lid 908. After removing the fluid tank 900 from the lower housing assembly 105, the lower tank lid 908 can be loosened and the filter assembly 1301, which is held in place by it, can be removed from the tank volume 901. Reference is also made to the disclosure with reference to the Fig. 22 and Fig. 23 referred.

[0308] In the design according to Fig. 69 The filter device 1301 includes a filter unit 1302, a support structure 1310 and a filter cleaning device designed as a scraper 1330.

[0309] The filter unit 1302 is a wire mesh filter 13028. The opening width of the wire mesh filter 13028 is between 10 µm and 20 µm. The wire mesh filter 13028 has a cylindrical shape. The wire mesh filter 13028 is aligned coaxially with a longitudinal axis of the tank shell 904.

[0310] The filter unit 1302, specifically the wire mesh filter 13028, is held in place by the support structure 1310. The support structure 1310 is cup-shaped and thus also has a circular cylindrical form. An outer surface of the support structure 1310, located radially outside, rests against an inner surface of the wire mesh filter 13028, located radially inside. This provides radial inward support for the wire mesh filter 13028 by the support structure 1310. This support is particularly advantageous when the wire mesh filter 13028 lacks sufficient inherent rigidity and therefore has a flexible filter medium 1309'.

[0311] The support structure 1301 has a large number of radially extending through openings (in Fig. 69 (without reference numeral), through which the liquid to be filtered can pass from the outside via the inside of the wire mesh filter 13028 to the inside of the filter element 1302 and from there through the tank outlet 903.

[0312] The scraper device 1330 has several scraper elements 1331 and a movement mechanism 1332.

[0313] In the longitudinal section of the Fig. Figure 69 shows two of the aforementioned multiple scraper elements 1331. The scraper elements 1331 are each in contact with an outer surface 1308 of the wire mesh filter 13028 and are movable relative to it. In the embodiment shown, a rotary movement of the scraper elements 1331 is provided by means of the movement mechanism 1332.

[0314] In the embodiment shown, the motion mechanism 1332 comprises a drive motor 1333, a drive shaft 1334, a drive pinion 1335, an output toothing 1336, an output element 1337 and a bearing element 1338.

[0315] In this case, the drive motor 1333 is mounted on the lower housing assembly 105 and detachably connected to the drive shaft 1334 for torque transmission. When the fluid tank 900 is removed from the lower housing assembly 105, the connection between the drive shaft 1334 and the drive motor 1333 is released. For the purpose of this detachable connection between the drive motor 1333 and the drive shaft 1334, a lower end of the drive shaft 1334 engages in a complementary drive element of the drive motor 1333. The lower end of the drive shaft 1334 protrudes from the tank volume 901 through the tank lid 908 in a manner not shown in detail. To prevent fluid from escaping from the tank volume 901, the passage of the drive shaft 1334 through the tank lid 908 is sealed fluid-tight with a sealing element not specified in detail.

[0316] The drive shaft 1334 extends longitudinally parallel to the longitudinal axis of the fluid tank 900 and thus also of the filter unit 1302. In the illustrated embodiment, an upper end face of the drive shaft 1334 projects beyond an upper end face of the filter unit 1302.

[0317] The drive pinion 1335 is torque-resistant, joined to the upper end face of the drive shaft 1334. The drive pinion 1335 is engaged with the output teeth 1336.

[0318] In the embodiment shown, the output toothing 1336 is an internal toothing and is formed on the output element 1337.

[0319] The output element 1337 is rotatably mounted on the support structure 1310. For this purpose, the bearing element 1338 is provided and is formed integrally with the output element 1337. The bearing element 1338 engages in a releasable, form-fitting manner in the axial direction and slidably in the circumferential direction in a bearing seat 13102 provided for this purpose in the support structure 1310. In this configuration, the output element 1337 is rotatably coaxial about the longitudinal axis of the fluid tank 900 and thus also of the filter unit 1302. The several wiper elements 1331 are each operatively connected to the output element 1337 in a force- and motion-transmitting manner. This operative connection is releasable, so that the wiper elements 1331 can be easily removed and replaced if necessary.

[0320] To clean the filter unit 1302, more precisely: to wipe the wire mesh filter 13028, the drive motor 1333 drives the output element 1337 via the drive shaft 1334, and with it the wiper elements 1331. The wiper elements 1331 thus move along the surface 1308, thereby wiping off dirt accumulated on the surface 1308.

[0321] In the illustrated embodiment, the rotary drive motion of the drive motor 1333 is reduced via the gearing formed between the drive pinion 1335 and the output gear 1336. In other words, the drive pinion 1335 and the output gear 1336 form a reduction stage.

[0322] In one configuration, continuous filter cleaning is provided. In such a continuous filter cleaning system, the drive motor 1333 drives the scraper elements 1331 for the entire duration of the wet cleaning process. The drive motor 1333 is started when the relevant surface cleaning device is switched on and is switched off together with the surface cleaning device.

[0323] In a further embodiment, controllable filter cleaning is provided. This control can be achieved by a user of the surface cleaning device selectively switching the drive motor 1333 on and off. Alternatively or additionally, the drive motor 1333 can be controlled depending on the degree of contamination G of the liquid. This control can also include, in particular, stepless speed control of the drive motor. The degree of contamination G can be determined, for example, by reference to Fig. The detection device 1400 described in section 2 can be used to detect the pollution level. The control of the drive motor 1333 can then be adjusted depending on the degree of pollution G by means of a control unit 1900 (see section 2). Fig. 6) be controlled.

[0324] In the Fig. 70 and Fig. Figure 71 shows exemplary filter units 1302. The filter units 1302 according to the Fig. 70 and Fig. 71 exhibit a fundamentally similar design and function to the filter unit of the filter system according to Fig. 69. Thus, the filter units 1302 show the following Fig. 70 and Fig. 71 each a flexible filter medium 1309' in the form of a wire mesh filter 13028.

[0325] The filter unit 1302 after Fig. Figure 70 has a support structure 1310 which abuts radially against an inner side of the wire mesh filter 13028 and is provided with a plurality of through-openings 13101. The through-openings 13101 extend radially between an inner and an outer side of the support structure 1310 and are each square in cross-section. The support structure 1310 thus has a grid-like structure. At its upper end face, the support structure 1310 has a bearing seat 13102 (see Figure 70). Fig. 69).

[0326] The filter element 1302 according to Fig. 71 has a differently designed support structure 1310'. The support structure 1310' is largely identical to the support structure 1310 of the in Fig. Filter device 1301 shown in 69. In contrast to the support structure 1310 according to Fig. 70 shows the support structure 1310' Fig. Figure 71 features a multitude of circular openings 1310'. The circular openings 1310' have smaller opening widths than the respective opening widths of the square openings 13101. Due to its different design, the support structure 1310' exhibits a comparatively greater inherent stiffness in the radial direction than the support structure 1310. Fig. 70 up.

[0327] In Fig. Figure 72 shows a further embodiment of a filter device 1301. In accordance with the embodiment according to Fig. 69 The filter device 1301 is also arranged in a tank volume 901 of a fluid tank 900. With regard to possible alternative arrangements of the filter device 1301, the following applies mutatis mutandis, already with reference to Fig. 69 said.

[0328] The filter unit 1301 according to Fig. 72 differs from filter unit 1301 according to Fig. 69 essentially by the method of filter cleaning. In the design according to Fig. 72 instead of a scraping device, a vibration device 1370 is present.

[0329] The vibration device 1370 includes a vibration motor 1371. The vibration motor 1371 is mounted in a motor receptacle 13103 provided for this purpose in the support structure 1310''. The vibrations generated by the vibration motor 1371 are transmitted directly to the support structure 1310'' via the motor receptacle 13103 and from there to the filter unit 1302.

[0330] To allow sufficient vibration mobility of the support structure 1310'' and thus of the filter unit 1302, the support structure 1310'' is held on the inside of the lower tank lid 908 by means of an elastic retaining element 1372. In other words: The support structure 1310'' together with the filter unit 1302 is elastically mounted by means of the retaining element 1372.

[0331] Regarding the remaining design of the filter unit 1302, the same applies mutatis mutandis as already described for the filter units 1302 according to the Fig. 69, Fig. 70 to Fig. 71. In the present case, the filter unit 1302 also has a flexible filter medium 1309' and / or a wire mesh filter 13028.

[0332] The vibration motor 1371 is supplied with electrical energy via a connecting cable 1373. In this case, the connecting cable 1373 runs along a radial inner surface of the support structure 1310''. At its end facing away from the vibration motor 1371, the connecting cable 1373 is connected to an electrical connector (without reference numeral). The connection via the electrical connector can be disconnected by removing the fluid tank 900 from the lower housing assembly 105. Conversely, the electrical connection is closed as soon as the fluid tank is placed onto the lower housing assembly 105. The aforementioned electrical connector is connected to a power supply unit 1600 in a manner not shown in detail (see in particular Figure 1600). Fig. 2) connected or connectable.

[0333] In an embodiment not shown in the figures, inductive energy transmission to the vibration motor 1371 is provided instead of wired energy transmission.

[0334] Instead of the vibration motor 1371, an ultrasonic transducer 1375 can also be used. The ultrasonic transducer 1375 generates ultrasound, which can prevent dirt from accumulating on the filter unit 1302.

[0335] The ultrasonic transducer 1375 can also be positioned away from the support structure 1310'' and transmit the ultrasound only indirectly to the filter unit 1302. This indirect transmission can occur, for example, via the liquid to be filtered itself.

[0336] With regard to a possible continuous or controlled operation of the vibration device 1370, the same applies mutatis mutandis as already stated for the scraper device 1330. Fig. 69 said.

[0337] In the Fig. 73 and Fig. Figure 74 shows a specific configuration of an additional equipment device 1450.

[0338] The auxiliary device 1450 is particularly suitable for surface cleaning equipment according to the Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10 to Fig. 11 suitable and / or as a component of the fluid tanks according to the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. 54, 69 and 72. In particular, the supplementary funding facility 1450 can be used as an alternative or in addition to one of the facilities referred to in Fig. The two optional units described above, 100, 200, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, and 1800, may be present. The additional equipment unit 1450 can also be used as a component of the units described in the Fig. 75, Fig. 76, Fig. 77 to Fig. The robot device shown in section 78 can be used.

[0339] During the Fig. 73 and Fig. In the embodiment shown in Figure 74, the auxiliary device 1450, in the form of an upper tank lid 907, is detachably fixed to a tank shell 904 of a fluid tank 900. The tank shell 904 is in the Fig. 73 and Fig. 74 shown cut off at the bottom.

[0340] Alternatively to the one in the Fig. 73 and Fig. In the embodiment shown in Figure 74 as an upper tank cap 907, the auxiliary device 1450 can, for example, also be designed as a component of an upper housing device 104 (see in particular Figure 74). Fig. 6 and Fig. 9).

[0341] In the embodiment shown, the additive device 1450 is designed for the metered dispensing of several different additives. The additive device 1450 comprises an additive container 1451 and a dispensing device 1452.

[0342] The additive container 1451 has three container chambers, of which in Fig. Figure 74 shows two container chambers 14511 and 14512, which can also be referred to as the first container chamber 14511 and the second container chamber 14512. Each of the container chambers is designed to hold an additive. In the embodiment shown, the respective container chamber is designed to hold a liquid additive. The container chambers are accordingly separated from each other in a fluid-tight manner.

[0343] The dispensing device 1452 has several actuating elements 14521, 14522 and 14523, each of which is assigned to one of the container chambers and can be designated as the first actuating element 14521, the second actuating element 14522 and the third actuating element 14523.

[0344] The actuating elements 14521, 14522, 14523 each form an upper cover of the respective container chamber. The actuating elements 14521, 14522, 14523 can each be manually pressed in along an actuating axis, which in this case is aligned parallel to a longitudinal axis of the fluid tank 900.

[0345] The actuating elements 14521, 14522, and 14523 are each elastically returned to their original position relative to the actuating axis by means of a spring element 1454. The spring elements are supported at one end on an inner side of the respective actuating element 14521, 14522, or 14523 and at the other end on the bottom of the respective container chamber. Each container chamber has an outlet valve 1453 in the area of ​​its bottom. Pressing the respective actuating element 14521, 14522, or 14523 exerts pressure on the respective additive. If the pressure exceeds the opening pressure of the outlet valve 1453, the valve opens, releasing the additive from the respective container chamber into the tank volume 901.

[0346] To allow for metered dispensing of the additives, the actuating elements 14521, 14522, 14523 and / or container chambers can be equipped with a stop. The stop allows only a limited travel of the respective actuating element and thus also a limited quantity of additive dispensed.

[0347] In embodiments not shown in the figures, the auxiliary device 1450 has an auxiliary container 1451 with one, two, or more container chambers than the three shown here. The same applies to the number of actuating elements.

[0348] The in the Fig. 73 and Fig. The embodiment shown in Figure 74 is particularly advantageous for the use of three different additives. For example, a first additive can be placed in the first container chamber 14511, a second additive in the second container chamber 14512, and a third additive in the third container chamber (without reference numeral). The additives may differ in their effect or other properties.

[0349] To avoid confusion regarding the additives, a color coding of the actuating elements 14521, 14522, 14523 is provided in a particularly advantageous embodiment. In other words, in said embodiment, the actuating elements 14521, 14523, 14522 have different colors.

[0350] To fill the additive container 1451, the actuating elements 14521, 14523, and 14522 can be removed. Alternatively or additionally, the additive can be filled into the additive container 1451 via the corresponding outlet valve or a filling opening provided for this purpose.

[0351] In the Fig. 75, Fig. 76, Fig. 77 to Fig. Figure 78 shows an embodiment of a surface cleaning system 10 according to the invention, comprising a surface cleaning device 1 and a robot device 4000.

[0352] The surface cleaning device 1 is designed as a scrubber-dryer 1' and has a basic structure that is essentially the same as the structure of the surface cleaning device 1a according to Fig. 55 corresponds. To avoid repetition, reference is therefore made to the disclosure relating to the surface cleaning device 1a according to Fig. Reference is made to and expressly made to section 65. What is stated there also applies analogously to the surface cleaning device 1 of the surface cleaning system 10 according to the Fig. 75, Fig. 76, Fig. 77 to Fig. 78. The surface cleaning system 10 can also be referred to as the scrubbing and vacuuming system 10'.

[0353] The robot device 4000 can be connected to the surface cleaning device 1 in a manner described in more detail below and is set up to move the surface cleaning device 1 autonomously over the area to be cleaned.

[0354] In the embodiment shown, the robot device 4000 comprises a base unit 4100, a first liquid reservoir 4200, a second liquid reservoir 4300, a third liquid reservoir 4400, auxiliary tool units 4500, a front suction bar 4600, and a rear suction bar 4700. The [unclear text] Fig. 75, Fig. 76, Fig. 77 to Fig. The robot device 4000 shown in Figure 78 is to be understood as exemplary. In embodiments not shown in the figures, not all of the aforementioned components 4100, 4200, 4300, 4400, 4500, 4600, 4700 are present. It is understood that the robot device 4000 also includes an auxiliary device 1450 according to the Fig. 67 as well as 73 and 74.

[0355] The base unit 4100 serves as a carrier for further components of the robot device, in particular the aforementioned components 4200 to 4700. Furthermore, the base unit 4100 serves as the actual mounting for the surface cleaning device 1. In the embodiment shown, the base unit 4100 has a front part 4102 and a rear part 4103 for this purpose, between which a receiving recess 4101 for receiving the surface cleaning device 1 is formed.

[0356] Furthermore, and according to the invention, it is also possible to design the robot device in which it is designed as a single unit to receive the surface cleaning device, i.e., for example, only the front part or only the rear part forms the base device and the receiver for the surface cleaning device.

[0357] Furthermore, the robotic device can also have fewer tanks than described above, and even no additional tanks at all. This is particularly the case if the robotic device incorporates the filter device and / or additive device according to the invention into a fluid path of the surface treatment device. Even in such configurations, it can nevertheless be advantageous to provide additional fluid volumes by means of one or more further tanks of the robotic device in order to further improve and increase the cleaning performance, duration, and / or area.

[0358] The front part 4102 and the rear part 4103 can be pivoted relative to each other in order to open and close the receiving recess 4101 for receiving the surface cleaning device 1. In the Fig. 75, Fig. 76 and Fig. 78 The front part 4102 and the rear part 4103 are pivoted together and secured to each other in a manner not shown in detail. The receiving recess 4101 is closed in this state. In the Fig. In the state shown in Figure 77, the front part 4102 and the rear part 4013 are swung open, releasing the receiving recess 4101. In this state, the surface cleaning device 1 can be removed from the receiving recess 4101 and thus from the robot device 4000.

[0359] When removed, the surface cleaning device 1 can be moved manually by a user across the surface to be cleaned in the usual way. When coupled to the robot device 4000 and held in the receiving recess 4101, the movement of the entire surface cleaning system 10, and thus also of the surface cleaning device 1, is carried out autonomously by the robot device 4000.

[0360] In the embodiment shown, the basic unit 4100 also includes a motion unit 4104. The motion unit 4104 is located in the Fig. 75, Fig. 76, Fig. 77 to Fig. Figure 78 shows only a schematic representation and features wheels (without reference numerals) that allow movement across the surface to be cleaned. The wheels can be driven or undriven. In one embodiment, the movement of the surface cleaning system 10 is effected by means of a propulsion device 1700 (see Figure 78). Fig. 2) of the surface cleaning device 1 and / or via a thrust generated by means of the tool device 300 (see Fig. 4, Fig. 5).

[0361] The base unit 4100 also includes a sensor unit 4105, which comprises sensor units 4106 and 4107 mounted laterally on the base unit 4100. The sensor unit 4105 serves to detect the surroundings of the surface cleaning system 10. This detection can, in principle, be carried out using any technology suitable for this purpose, for example, by camera, ultrasound, lidar, laser, or the like.

[0362] In the illustrated embodiment, the first liquid reservoir 4200 is an additional fresh water tank, which is connected or can be connected to a fresh water tank 80 of the surface cleaning device 1 via a fresh water line 4201. Due to the additional fresh water tank, the surface cleaning system 10 has a significantly larger fresh water capacity than the surface cleaning device 1.

[0363] In the embodiment shown, the second liquid storage container 4300 is an additional wastewater tank, which is connected or can be connected to a wastewater tank 90 of the surface cleaning device 1 via a wastewater line 4301.

[0364] Due to the additional wastewater tank, the surface cleaning system 10 has a significantly larger wastewater capacity than the surface cleaning device 1.

[0365] The 4200 and 4300 liquid reservoirs of the 4000 robotic device enable longer autonomous cleaning times. Without these reservoirs, the surface cleaning unit 1 would have to be removed from the 4000 robotic device when the 80 fresh water tank and / or the 90 dirty water tank were completely empty in order to refill or empty the tanks. Thanks to the 4200 and 4300 liquid reservoirs, less frequent refilling of fresh water and less frequent emptying of dirty water are required. Consequently, less user intervention is necessary, resulting in increased area coverage and overall improved efficiency.

[0366] In the illustrated embodiment, the third liquid reservoir 4400 is equipped with a separation device 1300, specifically a filter device 1301. The third liquid reservoir 4400 can also be referred to as a recycling tank. The third liquid reservoir 4400 is connected, in a manner not shown in detail in the figures, to a liquid dispensing point of the surface cleaning system 10. The liquid dispensing point is not shown in detail in the figures and can be associated with the surface cleaning device 1 and / or the robotic device 4000. The third liquid reservoir 4400 is also connected to a liquid intake of the surface cleaning system 10. In the illustrated embodiment, the liquid intake of the surface cleaning system 10 comprises a front suction bar 4600 and a rear suction bar 4700.The front suction bar 4600 and the rear suction bar 4700 are components of the robot device 4000 and are mounted on the base unit 4100. In configurations that additionally provide a liquid intake 500 on the surface cleaning device 1, the third liquid reservoir 4400 can also be coupled to the liquid intake 500 of the surface cleaning device 1.

[0367] Regarding the basic function of the third liquid storage container 4400, the same applies mutatis mutandis to the fluid tanks according to the Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39, Fig. 40, Fig. 41, Fig. 42, Fig. 43, Fig. 44, Fig. 45, Fig. 46, Fig. 47, Fig. 48, Fig. 49, Fig. 50, Fig. 51, Fig. 52, Fig. 53 to Fig. 54 revealed in essence.

[0368] In the embodiment shown, the filter device 1301 is arranged in a tank volume of the third liquid reservoir 4400. Alternatively, the filter device 1301 can be arranged upstream or downstream of the third liquid reservoir 4400 in a fluid path extending through the robot device 4000 and connectable to the fluid path of the surface cleaning device 1.

[0369] With regard to the arrangement and possible specific configurations of the filter device 1301, particular reference is made to the following: Fig. 69 and Fig. 72 revealed and expressly referenced. In other words: The ones in the Fig. 69 and Fig.The filter devices 1301 shown in Figure 72, including the respective optional filter cleaning device (for example, scraper device 1330 and / or vibration device 1370 and / or backwash device 1390), can be arranged analogously in the tank volume of the third liquid storage container 400.

[0370] The third liquid storage tank 4400, designed as a recycling tank and including the filter unit 1301, allows for a significantly increased cleaning time without user intervention.

[0371] In the illustrated embodiment, the additional tool devices 4500 are each designed as a disc brush and are detachably attached to the base device 4100. The additional tool devices 4500, as well as the front suction bar 4600 and the rear suction bar 4700, are to be understood as purely optional and are therefore not present in all embodiments. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2013 215 198 A1

[0003] DE 10 2024 103 715.6 [0004, 0005] DE 2024 103 715.6

[0004]

Claims

[1] Filter device (1301) for a surface cleaning device (1, 1') comprising at least one filter unit (1302) which is arranged to be placed in a fluid path (600) of the surface cleaning device (1, 1') and to filter a liquid flowing along the fluid path (600). [2] Filter device (1301) according to claim 1, wherein the at least one filter unit (1302) comprises at least one rigid filter medium (1309). [3] Filter device (1301) according to claim 1 or 2, wherein the at least one filter unit (1302) comprises at least one conformable filter medium (1309'). [4] Filter device (1301) according to one of the preceding claims, wherein the at least one filter unit (1302) comprises at least one loose filter medium (1309''). [5] Filter device (1301) according to one of the preceding claims, wherein the at least one filter unit (1302) comprises a sieve filter (13021), a pore filter (13022) and / or a filter cartridge (13023). [6] Filter device (1301) according to one of the preceding claims, wherein the at least one filter unit (1302) comprises a paper filter (13024), a fabric filter (13025) and / or a nonwoven filter (13026). [7] Filter device (1301) according to one of the preceding claims, wherein the at least one filter unit (1302) comprises a packed bed filter (13027) formed from a granular material. [8] Filter device (1301) according to one of the preceding claims, wherein the at least one filter unit (1302) comprises a wire mesh filter (13028) formed from wire mesh, in particular wherein the wire mesh is a filter weave or a mesh fabric. [9] Filter device (1301) according to one of the preceding claims, wherein the at least one filter unit (1302) is made of metal, plastic, paper and / or ceramic. [10] Filter device (1301) according to one of the preceding claims, wherein an opening size, in particular pore size and / or mesh size, of at least one filter unit (1302) is between 1 µm and 50 µm, preferably between 5 µm and 30 µm, particularly preferably between 10 µm and 20 µm. [11] Filter device (1301) according to one of the preceding claims, further comprising at least one support structure (1310) on which the at least one filter unit (1302) is held. [12] Filter device (1301) according to one of the preceding claims, further comprising a filter cleaning device (1320) which is configured to clean the at least one filter unit (1302), in particular before, during and / or after operation of the surface cleaning device (1, 1'). [13] Filter device (1301) according to claim 12, wherein the filter cleaning device (1320) has a scraper device (1330) which is configured to scrape a surface (1308) of the at least one filter unit (1302). [14] Filter device (1301) according to claim 13, wherein the stripping device (1330) has at least one stripping element (1331) and a movement mechanism (1332), wherein the stripping element (1331) and the at least one filter unit (1302) are movable relative to each other, in particular rotationally and / or translationally, and wherein the movement mechanism (1332) is configured to move the stripping element (1331) and / or the filter unit (1302). [15] Filter device (1301) according to claim 14, wherein the movement mechanism (1332) is arranged for manual operation by a user and / or wherein the movement mechanism (1332) is driven by means of a drive motor (1333) and / or the flowing liquid. [16] Filter device (1301) according to one of claims 12 to 15, wherein the filter cleaning device (1320) has a vibration device (1370) which is configured to vibrate the at least one filter unit (1302). [17] Filter device (1301) according to claim 16, wherein the vibration device (1370) has a vibration motor (1371) which is operatively connected to the at least one filter unit (1302). [18] Filter device (1301) according to claim 16 or 17, wherein the vibration device (1370) has an ultrasonic transducer (1375) configured to generate ultrasound. [19] Filter device (1301) according to one of claims 16 to 18, wherein the vibration device (1370) is configured to generate at least one signal, indication and / or warning tone, in particular depending on at least one control parameter. [20] Filter device (1301) according to one of claims 12 to 19, wherein the filter cleaning device (1320) has a backwashing device (1390) which is configured to backwash the at least one filter unit (1302). [21] Filter device (1301) according to one of the preceding claims, further comprising at least one additive (ZM) which is configured to release into the fluid flowing along the fluid path (600). [22] Filter device (1301) according to claim 21, wherein the at least one additive (ZM) has a cleaning, disinfecting, descaling, coloring, deodorizing and / or clarifying effect. [23] Filter device (1301) according to claim 21 or 22, wherein the at least one additive (ZM) is soluble in an additive body (ZMK) which is associated with the at least one filter unit (1302), in particular wherein the additive body (ZMK) comprises a capsule (ZMK1), a tablet (ZMK2), a cushion (ZMK3) or the like. [24] Filter device (1301) according to one of claims 21 to 23, wherein the at least one additive (ZM) is soluble in the at least one filter unit (1302). [25] Kit (20) for forming a filter device (1301) according to one of the preceding claims, comprising at least one filter unit (1302) and at least one additive body (ZMK) in which at least one additive (ZM) is soluble. [26] Kit (20) according to claim 25, further comprising several different and / or similar filter units (1302, 1302', 1302'', 1302'''). [27] Kit (20) according to claim 25 or 26, further comprising several different and / or similar additive bodies (ZMK, ZMK', ZMK'', ZMK'''). [28] Additive device (1450) for a surface cleaning device (1, 1') comprising at least one additive (ZM) which is configured to release into a liquid flowing along a fluid path (600) of the surface cleaning device (1, 1'), in particular wherein the at least one additive (ZM) has a cleaning, disinfecting, descaling, coloring, deodorizing and / or clarifying effect. [29] Additive device (1450) according to claim 28, further comprising at least one additive container (1451) in which the at least one additive (ZM) is stored. [30] Additive device (1450) according to claim 28 or 29, further comprising a dispensing device (1452) which is configured for the, in particular metered, dispensing of the at least one additive (ZM), in particular from the additive container (1451), into the fluid path (600). [31] Fluid tank (900) for a surface cleaning device (1, 1'), comprising at least one tank inlet (902), one tank outlet (903), one tank volume (901) and at least one filter device (1301) according to one of claims 1 to 24 and / or at least one additive device (1450) according to one of claims 28 to 30. [32] Fluid tank (900) according to claim 31, wherein the filter device (1301) is arranged in the tank volume (901). [33] Fluid tank (900) according to claim 32, wherein the filter device (1301) can be removed from the tank volume (901) through the tank inlet (902) and / or the tank outlet (903) and / or a closable tank opening. [34] Fluid tank (900) according to claim 33, further comprising a tank lid (908) for opening and closing the tank opening, wherein the filter device (1301) is detachably attached to the tank lid (908). [35] Fluid tank (900) according to one of claims 31 to 34, wherein the additive device (1450) is arranged on the fluid tank (90) and / or in the tank volume (901). [36] Surface cleaning device (1, 1') for wet cleaning a surface (S, S'), comprising at least one fluid path (600), a filter device (1301) according to one of claims 1 to 24, which is arranged in the fluid path (600), and / or an additional means device (1450) according to one of claims 28 to 30 and / or at least one fluid tank (900) according to one of claims 31 to 35, through which the fluid path (600) extends at least sectionally. [37] Surface cleaning device (1, 1') according to claim 36, further comprising a tool device (300) which is set up to act on the surface (S, S'), a fluid outlet (400) designed to discharge liquid onto the surface (S, S'), a fluid intake (500) which is designed to receive fluid discharged onto the surface (S, S') by means of the fluid discharge (400), wherein the fluid path (600) connects the fluid intake (500) for the return of fluid taken up by means of the fluid intake (500) to the fluid discharge (400) in a fluid-conducting manner, a conveying device (700) which is set up to convey fluid along the fluid path (600), whereby fluid absorbed by the surface via fluid uptake (500) can be discharged onto the surface (S, S') via fluid discharge (400). [38] Surface cleaning device (1, 1') according to claim 36 or 37, further comprising a guide element (100) which extends longitudinally between a proximal end (102) and a distal end (103) and is designed for manually guiding the surface cleaning device (1, 1') over the surface (S, S'), a bottom part (200) which is connected to the distal end (103) of the guide part (100) and on which the tool device (300), the fluid discharge (400) and / or the fluid intake (500) is arranged. [39] Surface cleaning system (10, 10'), comprising a surface cleaning device (1, 1') according to one of claims 36 to 38, a robot device (4000) that can be detachably connected to the surface cleaning device (1, 1') and is designed to autonomously move the surface cleaning device (1, 1') over the surface (S, S') to be cleaned, wherein the robot device (4000) has at least one fluid reservoir (4200, 4300, 4400) and / or a fluid path that can be connected to the fluid path (600) of the surface cleaning device (1, 1'), and wherein the robot device (4000) comprises at least one filter device (1301) according to one of claims 1 to 24 and / or an auxiliary device according to one of claims 28 to 30.

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