Cleaning heads for wet vacuum cleaners

Abstract

A cleaning head for a wet vacuum cleaner has first and second rotating brushes each extending across the width of a housing. The housing includes a first protrusion having a first guide channel extending inwardly into the space between the brushes to create an air cavity above the floor, and a second protrusion extending inwardly through said space. The second protrusion has a second guide channel that creates another cavity above the floor. The cavities promote lateral air flow into the space between the brushes, thereby reducing pooling of water.

Description

[Technical field]

[0001] The present invention relates to a cleaning head for a wet vacuum cleaner. [Background technology]

[0002] Wet vacuum cleaners are known in which the cleaning head (often called a "nozzle") comprises two opposing rotating brushes. Suction is applied to at least the space between the brushes to suck up from the floor liquid delivered to the floor by the vacuum cleaner. The brushes contact the floor to perform a scrubbing action.

[0003] There are wet vacuum cleaners that are battery operated as well as mains powered, and for battery operated devices it is desirable to minimize the amount of power consumed and to have a small footprint for the cleaning head.

[0004] Reducing the footprint presents the problem of puddles forming on the floor during cleaning.

[0005] In some known designs, water pick-up is accomplished using vacuum suction in combination with an external squeegee. High air velocity along the squeegee creates wind pressure against the water, drawing it towards the suction nozzle. Vacuum suction can also create a drag force outside the reach of the brush, so that even if there is a space between the brush and the squeegee, the air flow can pull the water along the floor in the direction of the squeegee and towards the suction nozzle.

[0006] Other designs use the capillary action of the brush tufts themselves to pick up water. As the brush tufts hit the floor, they lose centrifugal acceleration and are then allowed to immerse themselves in the water by capillary action. The tufts are then driven off the floor and into the air, providing active fluid transport through the brush.

[0007] The rear brush, for example, is continuously fed with water, so that the rear brush continuously dumps water onto both the inner housing and the floor, as well as onto the front brush, and water picked up from the floor is dumped and partially strikes the front brush.

[0008] Thus, the front brush is moistened by three phenomena, namely: (i) The back brush sprays water onto the front brush. (ii) A damp floor comes into contact with the front brush. (iii) Water inside the housing falls onto the brushes or is guided back into the brushes by the spoiler (the last element that contacts the brushes before the water leaves the housing).

[0009] The advantage of this water pick-up principle using tufts instead of by air stream and squeegee is that the water pick-up is much more effective at picking up water and therefore uses less energy, and it can easily deal with uneven surfaces as the tufts are recessed by the floor, for example by about 3mm, as part of the water pick-up mechanism. Summary of the Invention [Problem to be solved by the invention]

[0010] However, whenever the brush tip is out of reach, the water is no longer drawn into the brush and therefore begins to pool, thus causing a puddle.

[0011] When the cleaner head is moving, dragging across the floor will cause water to be pulled into one of the brushes, but when it is stopped, no force is exerted on the puddle to remove it, which is undesirable as it will leave a puddle on the floor when the nozzle is removed.

[0012] EP2805659 discloses an extraction vacuum for floor surfaces, the head of the vacuum having an agitator assembly with two brush rolls and, optionally, side bristles mounted in respective brush receptacle openings on the sides of the head.

[0013] There is a need for a vacuum cleaner head design that reduces puddling, especially without the use of a squeegee. [Means for solving the problem]

[0014] The invention is defined by the claims.

[0015] According to an example according to an aspect of the present invention, there is provided a cleaning head for a wet vacuum cleaner, the cleaning head comprising: a housing having a width and a length and having a minimum clearance above a floor to be cleaned, the width being between a first side wall and a second side wall, the length being parallel to an intended main direction of movement of the cleaning head over a floor to be cleaned; a first rotating brush and a second rotating brush each extending across a width of the housing between a first side wall and a second side wall, the first rotating brush and the second rotating brush having parallel axes of rotation and aligned longitudinally; a suction channel for delivering suction to a space between at least the first rotating brush and the second rotating brush; Equipped with The housing is a first protrusion extending inwardly from the first sidewall into the space, the first protrusion having a first guide channel creating a first region of spacing greater than a minimum spacing; a second protrusion extending inwardly from the second sidewall into the space, the second protrusion having a second guide channel creating a second region of spacing greater than the minimum spacing; A cleaning head is provided having the following features:

[0016] The cleaning head has a pair of side-by-side rotating brushes. Air can enter the space between the rotating brushes by first and second guide channels formed in inward projections extending between the brushes. This aids in cleaning any puddles that form on the floor being cleaned, for example when the cleaning head is stationary. The guide channels provide an enlarged clearance to the floor being cleaned to facilitate airflow driven by suction applied to the cleaning head.

[0017] The guide channels in particular prevent water pooling at the ends of the rotating brushes, which is the cause of curved water trails in particular, since centrifugal force drives liquid out of the ends of the spaces between the rotating brushes when the cleaning head moves along a curved path.

[0018] In this way, the head design reduces build-up and reduces curved markings while the cleaning head is in use.

[0019] Since the housing is rectangular, the side walls are parallel, but for example, in the case of a triangular or trapezoidal housing, the side walls are not parallel. The first and second brushes may have the same length (across the width of the head) or they may have different lengths.

[0020] The first and second protrusions each extend longitudinally across a space between the first and second rotating brushes.

[0021] Thus, the protrusions define a closed loop at the ends of the rotating brushes around the spaces between the rotating brushes, thereby preventing pooling of liquid at the ends of the brushes which could result in curved impressions.

[0022] The first and second projections each include a rim about a respective guide channel, the rims being formed with a minimum spacing.

[0023] Thus, the part of the housing which defines the minimum spacing may also form a rim around the projection, which may for example be continuous with the edge around the entire cleaning head.

[0024] The rim may for example have a thickness, parallel to the plane defined by the minimum spacing, in the range of 1 mm to 15 mm.

[0025] The first and second regions of greater spacing have spacing that is 1 mm to 6 mm greater than the minimum spacing.

[0026] This increased spacing created by the induction channels is sufficient to create an inward airflow into the space between the brushes, specifically, it is comparable to or greater than the minimum spacing above the floor.

[0027] The minimum spacing may for example be in the range of 1.5mm to 5mm, such as 2mm to 3mm.

[0028] The minimum spacing is the amount that the brush protrudes below the lowest surface of the cleaning head to contact the floor. The spacing is selected to promote airflow driven by the suction applied to the cleaning head.

[0029] The cleaning head further comprises a support wheel arrangement for mounting the housing with minimal spacing above the floor to be cleaned.

[0030] The contact of the support wheel arrangement with the floor and the mounting of the support wheel arrangement to the housing define the spacing at which the housing is mounted above the floor.

[0031] The support wheel structure includes: a first support wheel in a space between the first rotating brush and the second rotating brush, the first support wheel being recessed from the first sidewall; a second support wheel in a space between the first rotating brush and the second rotating brush, the second support wheel being recessed from the second side wall; Equipped with.

[0032] To save space, the first and second support wheels are arranged between the rotating brushes, set back from but close to the ends. Instead of being arranged at or beyond the ends of the rotating brushes, the first and second support wheels are set back from the ends. In other words, the outermost extent in the width direction of the support wheels does not reach the ends of the rotating brushes. In this way, the wheels do not leave any traces on the floor, since they are covered by the brushes. Moreover, air can enter through the induction channels without first being blocked by the first and second support wheels.

[0033] The cleaning head further comprises a third support wheel longitudinally in front of or behind the first and second rotating brushes, and optionally a fourth support wheel aligned with the third support wheel.

[0034] A third support wheel is positioned behind or in front of the rotating brush to form at least a triangular support for the cleaning head. A fourth support wheel provides stable four-point support for the cleaning head.

[0035] The first and second support wheels are set back from the end of the respective rotating brush by a distance in the range of, for example, 2 cm to 4 cm, for example, in the range of, for example, 1 cm to 5 cm, respectively, this amount of wheel setback corresponding, for example, approximately to the length (in width direction) of the projection.

[0036] The cleaning head preferably further comprises a drive arrangement for driving the first and second rotating brushes in opposite rotational directions.

[0037] Thus, the brushes pick up debris and moisture from the floor. The drive arrangement, for example, drives the rotating brushes to have an upward movement on opposite sides of each other. This upward movement feeds the suction nozzle.

[0038] The drive arrangement may, for example, A single motor and belt drive to drive the rotating brushes, or A respective motor for each of the first and second rotating brushes Equipped with.

[0039] If separate motors are provided, they are mounted to the cores of each rotating brush.

[0040] The cleaning head preferably further comprises a fluid delivery arrangement for delivering fluid to the first and / or second rotating brushes.

[0041] The fluid is delivered, for example, to a rotating brush at the rear of the cleaning head.

[0042] The present invention also provides a method for producing a method for manufacturing a semiconductor device comprising the steps of: A cleaning head as defined above; a pump for delivering suction to a suction channel of the cleaning head; a fluid reservoir that delivers cleaning fluid to the cleaning head; A wet vacuum cleaner comprising:

[0043] These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.

[0044] For a better understanding of the present invention, and to show more clearly how the same may be carried into effect, reference will now be made, by way of example only, to the accompanying drawings, in which: [Brief description of the drawings]

[0045] [Figure 1] FIG. 1 illustrates a known layout for a wet floor cleaner head. [Diagram 2] FIG. 2 illustrates another known layout for achieving a smaller, more compact cleaning head. [Diagram 3] FIG. 3 is a cross-sectional view through one of the rear support wheels of the cleaning head of FIG. 2. [Figure 4]A diagram showing where puddles form, for example when the cleaning head is stationary or lifted for a while. [Diagram 5] FIG. 1 illustrates another related problem with puddles. [Figure 6] FIG. 1 illustrates a cleaning head design according to an example of the present invention. [Figure 7] FIG. 2 illustrates how the wheels are arranged. [Figure 8] FIG. 2 shows the back side of the cleaning head. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0046] The present invention will now be described with reference to the drawings.

[0047] It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the devices, systems and methods, are intended for purposes of illustration only and are not intended to limit the scope of the invention. These and other features, aspects, and advantages of the devices, systems and methods of the present invention will become better understood from the following description, the appended claims, and the accompanying drawings. It should be understood that the figures are merely schematic and are not drawn to scale. It should also be understood that the same reference numerals are used throughout the figures to indicate the same or similar parts.

[0048] The present invention provides a cleaning head for a wet vacuum cleaner having first and second rotating brushes each extending across the width of a housing. The housing includes a first protrusion having a first guide channel extending inwardly into the space between the brushes to create an air cavity above the floor, and a second protrusion extending inwardly through said space. The second protrusion has a second guide channel which creates another cavity above the floor. The cavities promote lateral air flow into the space between the brushes, thereby reducing pooling of water.

[0049] Figure 1 shows a known layout viewed from the underside of a wet floor cleaner head 10. The head comprises a housing 12 which supports a first, front brush 14 and a second, rear brush 16. A set of four support wheels 18 are arranged in a rectangular configuration behind the rear brush 16.

[0050] The main direction of movement of the cleaning head in use is parallel to the length of the cleaning head and at right angles to the width of the housing as defined above. The main direction of movement is indicated by the large arrow. This movement tends to roll the brush across the floor.

[0051] FIG. 2 shows another known layout for achieving a smaller, more compact cleaning head, for example more suitable for battery operated devices.

[0052] The head 10 again comprises a housing 12 which supports a first, front brush 14 and a second, rear brush 16 .

[0053] The housing 12 has a width W between a first side wall 20 and a second side wall 22, and a length L parallel to the intended primary direction of movement of the cleaning head over the floor to be cleaned.

[0054] The first and second rotating brushes 14, 16 are parallel to the axis of rotation, respectively, and extend longitudinally side-by-side across the width of the housing between the first and second side walls 20, 22. Suction channels are provided to deliver suction to at least the space 24 between the first and second rotating brushes 14, 16. In effect, suction is applied to the entire volume of the housing.

[0055] This definition of the width and length of the cleaning head is applicable throughout this text.

[0056] The support wheel arrangement in this design comprises a first support wheel 30 in the space 24 between the first and second rotating brushes, and a second support wheel 32 in the space 24 between the first and second rotating brushes. The outer surfaces of the wheels are approximately flush with the sidewalls in known designs.

[0057] The mounting of the first and second support wheels between the rotating brushes saves space. Behind the first and second rotating brushes in the longitudinal direction is a third support wheel 34 (which can alternatively be in front of them) and alongside the third support wheel 34 is a fourth support wheel 36.

[0058] Figure 3 shows a cross section through one 34 of the rear support wheels 34, 36 of the cleaning head of Figure 2, but showing the support wheel 30 further back (behind the plane of the cross section). The first and second rotating brushes 14, 16 are driven in opposite rotational directions so that they move upwards when facing each other in the space 24. A suction channel 40 delivers suction force to the space 24 between at least the first and second rotating brushes.

[0059] The rotating brushes are driven by a drive arrangement comprising a single motor and belt drive for driving the two rotating brushes, or alternatively, each rotating brush has its own respective motor mounted to the core of the respective rotating brush.

[0060] The cleaning head further comprises a fluid delivery arrangement (not shown) for delivering fluid to the first and / or second rotating brushes. Fluid is delivered to the rotating brushes 16 at the rear of the cleaning head from a reservoir formed in the main housing of the vacuum cleaner, for example.

[0061] Rotation of the first and second brushes results in air blowing outwards from the front and back of the cleaning head, which in turn creates negative pressure in the space between the brushes (as air is continually removed), which creates lateral air suction.

[0062] The mounting of the support wheels by the housing defines a minimum distance S between the bottom surface of the housing and the floor surface. The minimum distance lies, for example, in the range of 1.5 mm to 3 mm. The rotating brushes project below the floor level (when the floor is not present), so that the tufts are deformed by the presence of the floor. This defines a depression in the floor, which is part of the water collection function as explained above.

[0063] FIG. 3 also shows front and rear spoilers 42 for directing water sprayed against the housing back to the brushes.

[0064] A problem with the compact head design is that larger puddles form, especially as the new support wheel locations, especially the first and second support wheels at the outermost sides of the brushes, between the brushes, prevent airflow from the sides, thereby resulting in the build-up of larger puddles.

[0065] Figure 4, for example, shows where puddles 50 form when the cleaning head is lifted or not moved for a period of time.

[0066] Figure 5 shows another related problem with puddles. When the cleaning head makes a sharp turn (indicated by the arrow), it can create additional wet flakes 52. This is due to centrifugal forces pulling water from directly under the cleaning head. In particular, during maneuvering, there is no force acting on the water to make it follow the turn. Instead, the water moves in a straight line and the cleaning head nozzle makes the turn. At some point during the turn, the puddle may have moved far enough to the side that it escapes the cleaning head from the side, leaving flakes 52 on the floor.

[0067] The increased pooling is primarily a result of blockages created by the first and second support wheels, for example. The problem is exacerbated for battery operated devices due to the reduced achievable air flow rate, for example about 6 liters / second instead of about 10 liters / second for mains systems.

[0068] Lateral inward flow is desirable because it blows inward from the side onto the water and no longer creates flakes when making a turn. The inward air flow also creates a smaller area but thicker puddle. The thicker puddle has a tendency to spread out, but the outward spreading laterally is inhibited by the inward air flow so that the expansion is directed towards the brush so that the puddle can be picked up more effectively.

[0069] Lighter sweeping heads and more maneuverable wheel layouts (Figure 2) make it easier to make sharp turns.

[0070] FIG. 6 shows a cleaning head design according to an example of the invention.

[0071] The cleaning head has the general layout shown in Figure 2 and is therefore suitable for low power battery operated wet vacuum cleaners. However, formations are provided to promote inward lateral air flow. Additionally, first and second support wheels are fitted from the side walls as described below.

[0072] FIG. 6 shows the underside of the cleaning head (without showing the support wheels) at one lateral side 20 of the housing and therefore at one end of the brushes 14,16.

[0073] Each lateral side has a projection that extends inwardly from the respective side wall into the space 24 between brushes 14 and 16. Each projection has a guide channel that creates a first area on the floor being cleaned of greater than minimum spacing.

[0074] 6 thus shows a first protrusion 60 extending inwardly from the first sidewall 20 into the space 24. The first protrusion 60 has guide channels 62 that create a first region of greater than minimum spacing. This region of greater spacing is specifically formed as an opening in the sidewall 20, such that when viewed from the side, there is a region of increased height above the floor and functions as an air opening into the cavity defined by the guide channels 62.

[0075] The guide channel has a U-shape with a wide opening at the lateral side 20 and a closed end at the plug end of the projection.

[0076] The first guide channel 62 allows air to enter laterally into the space between the rotating brushes. This helps to remove any puddles that may form on the floor being cleaned, for example when the cleaning head is stationary. The guide channel creates an enlarged clearance for the floor being cleaned to facilitate airflow driven by suction applied to the cleaning head and by the rotation of the brushes.

[0077] The guide channels in particular prevent water pooling at the ends of the rotating brushes, which is the cause of curved water trails in particular, since centrifugal force drives liquid out of the ends of the spaces between the rotating brushes when the cleaning head moves along a curved path.

[0078] In this way, the head design reduces build-up and reduces curved markings while the cleaning head is in use.

[0079] The first protrusion 60 extends lengthwise across the space between the first rotating brush 14 and the second rotating brush 16, but does not inhibit the rotation of the brushes. The protrusion acts as a blocking tray to prevent water from the inside of the housing from dripping onto the floor at the ends of the rotating brushes, and also acts as a frame to create an air flow channel.

[0080] The first projection 60 has a rim 64 around the guide channel 62. The rim is flush with the rear main side of the housing such that the rim 64 is formed as part of the housing that defines the minimum spacing. The guide channel 62 is formed as a raised area (raised when the cleaning head is in an upright orientation) such that an enlarged channel opening is defined at the lateral side 20 of the housing.

[0081] The rim may have a width (i.e., thickness) parallel to the plane defined by the minimum spacing, ranging from 1 mm to 15 mm. The particular shape shown has a minimum rim width w1 of about 3 mm and a maximum rim width w2 of about 11 mm.

[0082] The channel opening has a depth d1, for example, in the range of 1 mm to 6 mm. In one example, it is approximately 4 mm (in the range of 3 mm to 5 mm). Thus, the distance to the floor is greater than the minimum spacing set by the housing (e.g., 1.5 mm to 5 mm, such as 2.75 mm) by an amount equivalent to dimension d1.

[0083] This increased spacing created by the guiding channels is sufficient to create an inward air flow into the space between the brushes, in particular, it is comparable to or greater than the minimum spacing S itself.

[0084] The guide channel 62 may, for example, be tapered in depth so that it meets the rim of the protrusion 60 laterally inward of the protrusion 60. Air is drawn through the cavity toward the brush. This air flow prevents water from accumulating to form puddles.

[0085] Figure 7 shows how the wheels are positioned. The first and second support wheels are mounted in the space 24 between the first and second rotating brushes, but are set back from their respective side walls. Thus, Figure 7 shows the first support wheel 30 set back from the first side wall 20.

[0086] The first and second support wheels (particularly the sides closest to the respective side walls of the housing) are for example respectively set back from the respective ends of the rotating brushes by a distance D in the range of 1 cm to 5 cm, for example in the range of 2 cm to 4 cm, so that the marks made by the wheels are covered by the brushes.

[0087] The present design utilizes the lateral inward airflow described above to push water laterally and inward by creating a high velocity airflow that forces the water into the cleaning head.

[0088] The guidance channels and resulting cavities reduce the resistance to air entering the cleaning head from the sides, thereby allowing the airflow (in litres / second) to be kept as high as possible for the available power of the vacuum pump.

[0089] The inner ends of the protrusions terminate in a rim (at a minimum spacing above the floor) and the flow entering the cavity is converted into a high velocity air flow by a small slit (i.e., gap to the floor). The rim around the guide channel 62 in the example shown has a general U-shape, thereby defining a U-shaped guide channel that extends into the space between the brushes, reducing the open area. The U-shaped channel is merely an example. The guide channel can be any desired shape, including curved or angular profiles, such as rectangular or triangular.

[0090] The side arms of the guide channels next to the brushes guide the water exiting the housing and back towards the brushes again, and in particular the rim around each guide channel guides the water towards the centre of the cleaning head (in the lateral width direction) making it less likely to be expelled out the sides.

[0091] The overall shape of the rim also creates an air barrier / fence through which water cannot escape when air blows sideways as well as laterally and inwards. This air barrier / fence is very effective at preventing water from escaping out the sides during maneuvering of the cleaning head.

[0092] The lateral inward and lateral airflow from the induction channel contributes to this air barrier / fence function. At the lateral inward end of the induction channel, high velocity air passing through a small slit just below the rim also continuously pushes water towards the center, thus preventing water flakes and reducing the size of puddles in the center, even during sharp turns.

[0093] The induction channel is also designed to create a low air resistance inlet at the laterally outermost end of the induction channel so that the air dynamics of the vacuum cleaner can drive the desired airflow directly under the rim.

[0094] Figure 8 shows a view of the underside of the cleaning head, which shows not only the first protrusions 60 but also the second protrusions 80, and not only the first guide channel 62 but also the second guide channel 82.

[0095] The housing is shown as generally rectangular so that the side walls 20, 22 are parallel, however, the side walls would not be parallel in the case of, for example, a triangular or trapezoidal housing. The first and second brushes may have the same length (across the width of the head) or may have different lengths.

[0096] The cleaning head is preferably part of a wet vacuum cleaner comprising a pump for delivering suction to a suction channel of the cleaning head, and a fluid reservoir for delivering cleaning fluid to the cleaning head.

[0097] Variations of the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and "a" does not exclude a plurality.

[0098] The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

[0099] It should be noted that the term "adapted" when used in the claims or description is intended to be equivalent to the term "configured."

[0100] Any reference signs in the claims should not be construed as limiting the scope.

Claims

1. 1. A cleaning head for a wet vacuum cleaner, the cleaning head comprising: a housing having a width and a length and a minimum clearance above a floor to be cleaned, the width being between a first side wall and a second side wall, the length being a length parallel to a direction of movement of the cleaning head above the floor to be cleaned, the minimum clearance being a clearance at which the distance between the floor and the housing is smallest; a first rotating brush and a second rotating brush each extending across the width of the housing between the first side wall and the second side wall, the first rotating brush and the second rotating brush having parallel axes of rotation and aligned longitudinally; a suction channel for delivering suction to a space between at least the first rotating brush and the second rotating brush; A cleaning head comprising: The housing comprises: a first protrusion extending inwardly from the first sidewall into the space, the first protrusion having a first guide channel creating a first region of spacing greater than the minimum spacing; a second protrusion extending inwardly from the second sidewall into the space, the second protrusion having a second guide channel creating a second region of spacing greater than the minimum spacing; A cleaning head comprising:

2. The cleaning head of claim 1 , wherein the first and second protrusions each extend longitudinally across the space between the first and second rotating brushes.

3. A cleaning head as claimed in claim 1 or 2, wherein the first and second projections each include a rim around a respective guide channel, the rims being formed at the minimum spacing.

4. A cleaning head according to claim 3, wherein the rim has a thickness, parallel to the plane defined by the minimum spacing, in the range of 1 mm to 15 mm.

5. A cleaning head according to any one of the preceding claims, wherein the first and second regions of greater spacing have a greater spacing that is between 1mm and 6mm greater than the minimum spacing.

6. A cleaning head according to any one of the preceding claims, wherein the minimum spacing is in the range 1.5mm to 5mm.

7. 7. A cleaning head according to any preceding claim, further comprising a support wheel arrangement for mounting the housing at the minimum spacing above the floor to be cleaned.

8. The support wheel structure is a first support wheel in the space between the first rotating brush and the second rotating brush, the first support wheel being spaced from the first sidewall; a second support wheel in the space between the first rotating brush and the second rotating brush, the second support wheel being spaced from the second sidewall; The cleaning head of claim 7 comprising:

9. The cleaning head of claim 8 , further comprising a third support wheel longitudinally in front of or behind the first and second rotating brushes.

10. 10. A cleaning head as claimed in claim 8 or 9, wherein the first and second support wheels are each spaced from an end of the respective rotating brush by a distance in the range of 1 cm to 5 cm.

11. A cleaning head according to any preceding claim, further comprising a drive arrangement for driving the first and second rotating brushes in opposite rotational directions.

12. The drive arrangement comprises: a single motor and belt drive for driving the first and second rotating brushes; or a respective motor for each of the first and second rotating brushes; The cleaning head of claim 11 comprising:

13. A cleaning head according to any one of the preceding claims, further comprising a fluid delivery arrangement for delivering fluid to the first and / or second rotating brushes.

14. A cleaning head according to any one of claims 1 to 13; a pump for delivering suction to a suction channel of the cleaning head; a fluid reservoir for delivering cleaning fluid to the cleaning head; A wet vacuum cleaner comprising:

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