Cleaning head for a wet vacuum cleaner

Abstract

The cleaning head for a wet vacuum cleaner has a first rotating brush and a second rotating brush, each extending across the width of a housing. The housing includes a first protrusion and a second protrusion. The first protrusion extends inward into the space between the brushes and has a first guide channel forming an air cavity in the floor. The second protrusion extends inward into said space. The second protrusion has a second guide channel forming another cavity in the floor. These cavities facilitate lateral airflow into the space between the brushes, thereby reducing water accumulation.

Description

Technical Field

[0001] This invention relates to a cleaning head for a wet vacuum cleaner. Background Technology

[0002] In known wet vacuum cleaners, the cleaning head (often called a "nozzle") has two brushes rotating in opposite directions. Suction is applied at least to the space between the brushes to extract liquid that has been delivered to the floor by the vacuum cleaner. The brushes then contact the floor to perform a scrubbing action.

[0003] There are wet vacuum cleaners that are powered by mains electricity and battery operated. For battery-operated devices, it is desirable to consume minimal power and have a small cleaning head footprint.

[0004] The problem with this reduced floor space is that puddles may form on the cleaned floors.

[0005] In some known designs, water extraction is achieved using vacuum suction combined with an external rubber squeegee. The high air velocity along the squeegee creates a dragging force on the water, pulling it into the suction nozzle. Vacuum suction can also create dragging force outside the brush's effective range, so even if there is space between the brush and the squeegee, airflow can still pull water along the floor towards the squeegee and suction nozzle.

[0006] In other designs, the capillary effect of the bristles themselves is used to draw in water. When the bristles strike the floor, they experience no centrifugal acceleration for a moment, allowing them to absorb some water through capillary action. The bristles are then propelled off the floor surface and into the air. This provides efficient fluid transport through the brush.

[0007] For example, the rear brush continuously supplies water, causing it to continuously spray water onto the inner shell, the floor, and the front brush. Water picked up from the floor will also be agitated and partially impact the front brush.

[0008] Therefore, the front brush is wetted by three phenomena:

[0009] (i) Spray water onto it with the brush.

[0010] (ii) Wet floor in contact with front brush.

[0011] (iii) Water inside the housing will fall onto the brush or be guided back into the brush by the baffle (which is the last element to come into contact with the brush before leaving the housing).

[0012] The advantage of this water-fetching principle, which uses tufts of hair instead of airflow and rubber brooms, is that it is more efficient at picking up water, thus using less energy, and it can easily handle uneven surfaces because the tufts are recessed into the floor, for example, by about 3mm, as part of the water-fetching mechanism.

[0013] However, once the water reaches the tip of the brush, it is no longer drawn into the brush, and thus begins to pool and form a puddle.

[0014] During the cleaning head's movement, the dragging force on the floor pulls water into one of the brushes, but when stationary, no force acts on the puddle to remove it. This leaves it on the floor when the nozzle is removed, which is undesirable.

[0015] EP 2 805 659 discloses a suction cleaner for floor surfaces. The cleaner's head has an agitator assembly with two brush rollers. Optionally, it also has side brushes, each of which is mounted in a brush receiving hole on the side of the head.

[0016] There is a need for a cleaning head design that reduces the formation of puddles, especially when not using a rubber broom. Summary of the Invention

[0017] According to an example of one aspect of the present invention, a cleaning head for a wet vacuum cleaner is provided, the cleaning head comprising:

[0018] A housing having a length and a width between a first sidewall and a second sidewall, the length being parallel to the intended main direction of movement of the cleaning head on the floor to be cleaned, wherein the housing has a minimum clearance on the floor to be cleaned;

[0019] A first rotating brush and a second rotating brush, each extending across the width of the housing between the first and second sidewalls, having parallel axes of rotation and being side-by-side in the length direction; and

[0020] A suction channel for delivering suction to the space between at least a first rotating brush and a second rotating brush;

[0021] The housing includes:

[0022] A first protrusion extending inwardly from the first sidewall into the space, the first protrusion having a first guide channel creating a first region having a larger spacing than the minimum spacing; and

[0023] A second protrusion extends inwardly from the second sidewall into the space, the second protrusion having a second guide channel that creates a second region having a larger spacing than the minimum spacing.

[0024] The cleaning head has a pair of rotating brushes arranged side by side. Air can enter the space between the rotating brushes through first and second guide channels, which are formed at inward protrusions that extend into the space between the brushes. This helps to remove any puddles that form on the floor to be cleaned, for example, if the cleaning head is stationary. The guide channels form an enlarged gap relative to the floor to be cleaned to facilitate an airflow driven by suction applied to the cleaning head.

[0025] The guide channels are designed to prevent water from pooling at the ends of the rotating brushes. This pooling at the ends is particularly problematic if the cleaning head moves along a sharp, curved path, as centrifugal force drives the liquid out of the space between the rotating brushes.

[0026] Therefore, during the use of the cleaning head, the head design reduces condensation and minimizes bending marks.

[0027] The housing can be rectangular, such that the sidewalls are parallel, but the sidewalls can be non-parallel, for example, in the case of a triangular or trapezoidal housing. The first and second brushes can have the same length (in the width direction of the head) or they can have different lengths.

[0028] The first and second protrusions can each extend in the length direction across the space between the first and second rotating brushes.

[0029] Therefore, the protrusion defines a closed loop around the space between the rotating brushes at the end of the brush, thereby preventing liquid from pooling at the end of the brush, which could cause bending marks.

[0030] The first and second protrusions may each include an edge surrounding the respective guide channel, wherein the edge is formed at the minimum spacing.

[0031] Therefore, the portion of the housing that defines the minimum spacing also forms an edge around the protrusion, and this is continuous, for example, with the edge around the entire cleaning head.

[0032] The edge, for example, has a thickness in the range of 1 mm to 15 mm, parallel to the plane defined by the minimum spacing.

[0033] The first and second regions with larger spacing can have a spacing between 1 mm and 6 mm larger than the minimum spacing.

[0034] The increased spacing created by the guide channels is sufficient to generate an inward airflow into the space between the brushes. In particular, it is equivalent to or greater than the minimum spacing above the floor.

[0035] The minimum spacing is, for example, in the range of 1.5mm to 5mm, or 2mm to 3mm.

[0036] This minimum spacing is the amount by which the brush protrudes below the lowest point of the cleaning head and contacts the floor. This spacing is chosen to promote airflow driven by the suction applied to the cleaning head.

[0037] The cleaning head may also include a support wheel assembly for mounting the housing at a minimum distance above the floor to be cleaned.

[0038] The contact between the support wheel assembly and the floor, as well as the installation of the support wheel assembly onto the housing, define the distance at which the housing is mounted above the floor.

[0039] The support wheel device may include:

[0040] A first support wheel is located in the space between the first rotating brush and the second rotating brush, and is positioned rearward from the first side wall; and

[0041] The second support wheel is located in the space between the first rotating brush and the second rotating brush, and is positioned rearward from the second side wall.

[0042] To save space, the first and second support wheels are positioned between the rotating brushes, near the ends, but extending rearwards from the ends. Instead of positioning the first and second support wheels at or beyond the ends of the rotating brushes, they are positioned rearwards from the ends. In other words, the outermost extent of the support wheels in the width direction does not reach the ends of the rotating brushes. This way, the wheels do not leave marks on the floor when covered by the brush. Furthermore, air can enter via guide channels without initially being blocked by the first and second support wheels.

[0043] The cleaning head may also include a third support wheel located in front of or behind the first and second rotating brushes in the length direction, and optionally a fourth support wheel located alongside the third support wheel.

[0044] The third support wheel is positioned behind or in front of the rotating brush to form at least a triangular support for the cleaning head. The fourth support wheel provides stable four-point support for the cleaning head.

[0045] The first and second support wheels are each positioned rearward from the corresponding end of the rotating brush at a distance ranging from 1 cm to 5 cm, for example, from 2 cm to 4 cm. The amount of indentation of the wheels roughly corresponds to the length of the protrusion (along the width direction).

[0046] The cleaning head preferably also includes a drive mechanism for driving the first rotating brush and the second rotating brush in opposite directions of rotation.

[0047] The brush thus picks up debris and moisture from the floor. A drive mechanism, for example, is used to drive the rotating brush to have an upward motion at its facing sides. This upward motion supplies the suction nozzle.

[0048] The drive unit includes, for example:

[0049] A single motor and a belt drive for driving the rotating brush; or

[0050] The corresponding motor for each of the first and second rotating brushes.

[0051] When a separate motor is provided, it can be installed in the core of the corresponding rotating brush.

[0052] The cleaning head preferably also includes a fluid delivery device for delivering fluid to the first and / or second rotating brush.

[0053] Fluid can be delivered to the rotating brush, for example, at the rear of the cleaning head.

[0054] The present invention also provides a wet vacuum cleaner, comprising:

[0055] The cleaning head defined above;

[0056] A pump is used to deliver suction into the suction channel of the cleaning head; and

[0057] The fluid reservoir delivers the cleaning fluid to the cleaning head.

[0058] These and other aspects of the invention will become apparent and will be illustrated with reference to the embodiments described below. Attached Figure Description

[0059] To better understand the invention and to more clearly illustrate how to implement it, reference will now be made to the accompanying drawings by way of example only, wherein:

[0060] Figure 1 A known layout for a wet floor cleaning head is shown;

[0061] Figure 2 This demonstrates another known layout for achieving a smaller and more compact cleaning head;

[0062] Figure 3 It shows crossing Figure 2 The cross-section of one of the support wheels in the rear support wheel of the cleaning head;

[0063] Figure 4 The image shows places where water pools, for example, if the cleaning head remains still for a period of time or is lifted.

[0064] Figure 5 This illustrates another issue related to the pond;

[0065] Figure 6 A cleaning head design according to an example of the present invention is shown;

[0066] Figure 7 It shows how the wheels are positioned; and

[0067] Figure 8 A view of the bottom side of the cleaning head is shown. Detailed Implementation

[0068] The present invention will be described with reference to the accompanying drawings.

[0069] It should be understood that while the detailed description and specific examples indicate exemplary embodiments of the apparatus, system, and method, they are for illustrative purposes only and are not intended to limit the scope of the invention. These and other features, aspects, and advantages of the apparatus, system, and method of the present invention will become more readily apparent from the following description, the appended claims, and the accompanying drawings. It should be understood that the drawings are merely schematic and not drawn to scale. It should also be understood that the same reference numerals are used in all the drawings to denote the same or similar parts.

[0070] This invention provides a cleaning head for a wet vacuum cleaner, the cleaning head having a first rotating brush and a second rotating brush, each extending across the width of a housing. The housing includes a first protrusion and a second protrusion, the first protrusion extending inward into a space between the brushes and having a first guide channel forming an air cavity in the floor, the second protrusion extending inward into said space. The second protrusion has a second guide channel forming another cavity in the floor. These cavities facilitate lateral airflow into the space between the brushes, thereby reducing water accumulation.

[0071] Figure 1 A known layout of the wet floor cleaning head 10, viewed from below, is shown. The brush head includes a housing 12 supporting a first rotating brush 14 and a second rotating brush 16. A set of four support wheels 18 are arranged in a rectangular configuration behind the rotating brush 16.

[0072] The main direction of movement of the cleaning head during use is parallel to the length of the cleaning head and perpendicular to the width of the aforementioned housing. The main direction of movement is indicated by the large arrow. This movement tends to cause the brush to roll on the floor.

[0073] Figure 2 Another known layout for achieving a smaller and more compact cleaning head is shown, such as a device better suited for battery operation.

[0074] The cleaning head 10 also includes a housing 12 that supports the first rotating brush 14 and the second rotating brush 16.

[0075] The housing 12 has a length L and a width W between the first sidewall 20 and the second sidewall 22, the length of which is parallel to the intended main direction of movement of the cleaning head on the floor to be cleaned.

[0076] The first rotating brush 14 and the second rotating brush 16 each extend across the width of the housing between the first sidewall 20 and the second sidewall 22, have parallel axes of rotation, and are side-by-side in the length direction. A suction channel is provided for delivering suction to at least the space 24 between the first rotating brush 14 and the second rotating brush 16. In effect, suction will be applied to the overall volume of the housing.

[0077] The definitions of the width and length directions of the cleaning head apply to this document.

[0078] The support wheel device in this design includes a first support wheel 30 located in the space 24 between the first and second rotating brushes, and a second support wheel 32 located in the space 24 between the first and second rotating brushes. In known designs, the outer surface of the wheel is approximately flush with the sidewall.

[0079] Installing the first and second support wheels between the rotating brushes saves space. There is a third support wheel 34 located behind the first and second rotating brushes in the longitudinal direction (alternatively, it can be located in front), and a fourth support wheel 36 placed side by side with the third support wheel 34.

[0080] Figure 3 It shows the way Figure 2 The cross-section of one of the rear support wheels 34 and 36 of the cleaning head is shown, and the more rearward (behind the plane of the cross-section) support wheel 30 is also shown. It shows the first rotating brush 14 and the second rotating brush 16 being driven in opposite directions of rotation, causing them to move upward in space 24 where they face each other. Suction channel 40 delivers suction to at least the space 24 between the first and second rotating brushes.

[0081] The rotating brushes are driven by a drive unit, which may include a single motor and a belt drive for driving two rotating brushes. Alternatively, each rotating brush may have its own respective motor mounted in the core of the respective rotating brush.

[0082] The cleaning head also has a fluid delivery device (not shown) for delivering fluid to the first and / or second rotating brushes. For example, fluid can be delivered from a reservoir formed in the main housing of the vacuum cleaner to the rotating brush 16 at the rear of the cleaning head.

[0083] The rotation of the first and second brushes causes the cleaning head to blow outwards from the front and back. It also creates underpressure in the space between the brushes (because air is continuously removed), which produces lateral air suction.

[0084] The support wheels, through the mounting of the housing, define a minimum distance S between the bottom surface of the housing and the floor surface. This minimum distance is, for example, in the range of 1.5 mm to 3 mm. The rotating brush protrudes below the horizontal plane of the floor (when the floor is not present), causing the bristles to deform due to the presence of the floor. As described above, this defines a floor recess and is part of its water collection function.

[0085] Figure 3 A front spoiler and a rear spoiler 42 are also shown for guiding water that has been sprayed onto the housing back to the brush.

[0086] One problem with the compact head design is the formation of larger water pools. In particular, the new support wheel positions, especially between the first and second support wheels at the outermost part of the brush, prevent air from flowing from the sides, and this leads to even larger water pools.

[0087] Figure 4 The location where a pool of water 50 forms is shown, for example, if the cleaning head is lifted or not moved for a period of time.

[0088] Figure 5 Another related problem with the water puddle is illustrated. When the cleaning head makes a sharp turn (indicated by the arrow), it can create additional wet streaks 52. This is due to centrifugal force pulling water out from under the cleaning head. Specifically, during the turn, no force acts on the water to make it follow the turn. Instead, as the cleaning head nozzle rotates, the water moves in a straight line. At some point during the turn, the puddle will have moved sufficiently to the side to attempt to escape the cleaning head from the side, thus leaving water streaks 52 on the floor.

[0089] The increased congestion is primarily a result of blockages created by the first and second support wheels. This problem is exacerbated in battery-operated devices due to the reduced airflow rate achievable, for example, approximately 6 liters per second, compared to approximately 10 liters per second for mains-powered systems.

[0090] Laterally inward flow is ideal because it blows water inward from the sides, so it no longer creates streaks when turning. The inward airflow will also create smaller but thicker pools of water. The thicker pools will tend to spread outward, but because the lateral outward spread is inhibited by the inward airflow, the spread will be directed towards the brush, thus the pools are picked up more effectively.

[0091] Lighter cleaning head and wheel layout ( Figure 2 The wheel layout makes it easier to maneuver, thus making sharp turns more likely.

[0092] Figure 6 A cleaning head design according to an example of the present invention is shown.

[0093] The cleaning head has Figure 2 The overall layout shown is therefore suitable for wet vacuum cleaners operating on low-power batteries. However, a device is provided to promote inward lateral airflow. Furthermore, a first support wheel and a second support wheel are inserted from the side wall, as described below.

[0094] Figure 6 The cleaning head (support wheel not shown) is shown on one lateral side 20 of the housing and therefore on the underside of one end of the brushes 14, 16.

[0095] On each lateral side, there is a protrusion extending inward from the corresponding sidewall into the space 24 between brushes 14 and 16. Each protrusion has a guide channel that creates a first area with a larger spacing on the floor to be cleaned than the minimum spacing.

[0096] therefore, Figure 6 A first protrusion 60 is shown extending inwardly from the first sidewall 20 into the space 24. The first protrusion 60 has a first guide channel 62 that creates a first region having a larger spacing than the minimum spacing. This larger spacing region 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, which serves as an air opening into the cavity defined by the first guide channel 62.

[0097] The guide channel has a U-shape, a wide opening at the lateral side 20, and a closed end at the insertion end of the protrusion.

[0098] Air can enter laterally into the space between the rotating brushes through the first guide channel 62. This helps to remove any wet puddles that form on the floor to be cleaned, for example, if the cleaning head is stationary. The guide channels form an enlarged gap relative to the floor to be cleaned to facilitate airflow driven by the suction applied to the cleaning head and the rotation of the brushes.

[0099] The guide channels are designed to prevent water from pooling at the ends of the rotating brushes. This pooling at the ends is especially problematic if the cleaning head moves along a sharp, curved path, as centrifugal force drives the liquid out of the space between the rotating brushes.

[0100] Therefore, during the use of the cleaning head, the head design reduces condensation and minimizes bending marks.

[0101] The first protrusion 60 extends longitudinally across the space between the first rotating brush 14 and the second rotating brush 16, but does not inhibit the rotation of the brushes. This protrusion serves both as a baffle to prevent water from the interior of the housing from dripping onto the floor at the ends of the rotating brushes and as a frame for forming airflow channels.

[0102] The first protrusion 60 has an edge 64 surrounding the first guide channel 62. The edge is coplanar with the main lower side of the housing, such that the edge 64 is formed as part of the housing defining a minimum spacing. The first guide channel 62 is formed as a protruding region (protruding when the cleaning head is in a vertical orientation), such that the enlarged channel opening is defined at the lateral side 20 of the housing.

[0103] The edges, for example, have a width (i.e., thickness) in the range of 1 mm to 15 mm, parallel to the plane defined by the minimum spacing. The particular shape shown has a minimum edge width w1 of approximately 3 mm and a maximum edge width w2 of approximately 11 mm.

[0104] The channel opening has a depth d1, for example, ranging from 1 mm to 6 mm. In one example, it is approximately 4 mm (ranging from 3 mm to 5 mm). Therefore, 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) corresponding to the dimension d1.

[0105] The increased spacing created by the guide channels is sufficient to generate an inward airflow into the space between the brushes. In particular, it can be equivalent to or greater than the minimum spacing S itself.

[0106] The first guide channel 62 is tapered in depth, for example, so that it merges with the edge and the first protrusion 60 at its laterally inward end. Air is drawn toward the brush through the cavity. This airflow prevents water from accumulating and forming a pool.

[0107] Figure 7 This illustrates 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 positioned rearwards from their respective side walls. Therefore, Figure 7A first support wheel 30 is shown positioned rearward from the first sidewall 20.

[0108] The first and second support wheels (particularly their sides closest to the corresponding sidewalls of the housing) are each positioned 1 to 5 cm behind the corresponding end of the rotating brush, with distance D ranging from 2 to 4 cm. The marks left by the wheels are thus covered by the brush.

[0109] The design of this invention utilizes the lateral inward airflow described above to propel water laterally inward by generating a high-speed airflow that pushes water into the cleaning head.

[0110] The guide channel and the resulting cavity reduce resistance to air entering the cleaning head from the side. This allows the airflow (in liters per second) to remain as high as possible for the available power of the vacuum pump.

[0111] Because the inward end of the protrusion terminates at the edge (at the minimum spacing above the floor), the airflow entering the cavity is converted into a high-speed airflow through a small slit (i.e., the gap to the floor). In the example shown, the edge surrounding the first guide channel 62 has a generally U-shaped shape, thereby defining a U-shaped guide channel, and the guide channel extends into the space between the brushes to reduce the opening area. The U-shaped channel is just one example. The guide channel can be any desired shape, with a curved or angled profile, such as a rectangle or triangle.

[0112] The side arms near the guide channels of the brush guide water away from the housing back into the brush. In particular, the edges around each guide channel direct water toward the center of the cleaning head (in the lateral width direction), making it more difficult for water to be released from the sides.

[0113] The overall shape of the edge also forms an air barrier / baffle, preventing water from escaping because the air blows not only laterally inwards but also sideways. This air barrier / baffle is very effective in preventing water from escaping from the sides during the cleaning head's rotation.

[0114] Lateral and inward airflow from the guide channel contributes to the function of this air barrier / baffle. At the lateral inward end of the guide channel, high-speed airflow passing through a small slit below the edge also continuously pushes the water toward the center, thus preventing streaks even during sharp turns and reducing the size of the pool at the center.

[0115] The guide channel is also designed to form a low-air-resistance inlet at the outermost lateral end of the guide channel, enabling the vacuum cleaner's aerodynamics to drive the desired airflow below the edge.

[0116] Figure 8A view of the lower side of the cleaning head is shown. It shows a first protrusion 60 and a second protective portion 80, as well as a first guide channel 62 and a second guide channel 82.

[0117] The housing is shown as generally rectangular, such that the sidewalls 20, 22 are parallel, but the sidewalls may not be parallel, for example, in the case of a triangular or trapezoidal housing. The first and second brushes may have the same length (in the width direction of the head) or they may have different lengths.

[0118] The cleaning head is preferably part of a wet vacuum cleaner, which includes a pump for delivering suction to the cleaning head and a fluid reservoir for delivering cleaning fluid to the cleaning head.

[0119] By studying the accompanying drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments in practicing the claimed invention. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality.

[0120] The fact that certain measures are described in mutually different dependent claims does not imply that combinations of these measures cannot be used advantageously.

[0121] If the term “suitable” is used in the claims or specification, it should be noted that the term “suitable” is intended to be equivalent to the term “configured as”.

[0122] Any reference numerals in the claims should not be construed as limiting the scope.

Claims

1. A cleaning head (10) for a wet vacuum cleaner, comprising: The housing (12) has a length and a width between a first sidewall (20) and a second sidewall (22), the length being parallel to the intended main direction of movement of the cleaning head on the floor to be cleaned, wherein the housing has a minimum spacing (S) on the floor to be cleaned. A first rotating brush (14) and a second rotating brush (16), each of the first rotating brush and the second rotating brush extending across the width of the housing (12) between the first sidewall (20) and the second sidewall (22), having parallel axes of rotation, and being side by side in the direction of the length; as well as Suction channel (40) for delivering suction to the space (24) between at least the first rotating brush (14) and the second rotating brush (16); The housing (12) is characterized in that it comprises: A first protrusion (60) extends inwardly from the first sidewall into the space, the first protrusion having a first guide channel (62) that creates a first region having a larger spacing than the minimum spacing; and A second protrusion (80) extends inwardly from the second sidewall into the space, the second protrusion having a second guide channel (82) that creates a second region having a larger spacing than the minimum spacing.

2. The cleaning head according to claim 1, wherein the first protrusion (60) and the second protrusion (80) each extend across the space between the first rotating brush and the second rotating brush in the direction of the length.

3. The cleaning head according to claim 1, wherein the first protrusion (60) and the second protrusion (80) each include an edge (64) surrounding the respective guide channel, wherein the edge (64) is formed at the minimum spacing.

4. The cleaning head according to claim 2, wherein the first protrusion (60) and the second protrusion (80) each include an edge (64) surrounding the respective guide channel, wherein the edge (64) is formed at the minimum spacing.

5. The cleaning head according to claim 3, wherein the edge (64) has a thickness in the range of 1 mm to 15 mm, parallel to the plane defined by the minimum spacing.

6. The cleaning head according to any one of claims 1 to 5, wherein the first region and the second region having a larger spacing have a spacing (d1) between 1 mm and 6 mm larger than the minimum spacing.

7. The cleaning head according to any one of claims 1 to 5, wherein the minimum spacing (S) is in the range of 1.5 mm to 5 mm.

8. The cleaning head according to any one of claims 1 to 5, further comprising a support wheel device (30, 32, 34, 36) for mounting the housing at the minimum spacing above the floor to be cleaned.

9. The cleaning head according to claim 8, wherein the support wheel device comprises: The first support wheel (30) is located in the space (24) between the first rotating brush and the second rotating brush, and is positioned rearward from the first sidewall (20); as well as The second support wheel (32) is located in the space (24) between the first rotating brush and the second rotating brush, and is positioned rearward from the second sidewall (22).

10. The cleaning head according to claim 9 further includes a third support wheel (34) located in front of or behind the first rotating brush and the second rotating brush in the length direction, and optionally includes a fourth support wheel (36) located side by side with the third support wheel.

11. The cleaning head according to claim 9, wherein the first support wheel (30) and the second support wheel (32) are each disposed at a distance (D) from the respective end of the rotating brush in the range of 1 cm to 5 cm.

12. The cleaning head according to claim 10, wherein the first support wheel (30) and the second support wheel (32) are each disposed at a distance (D) from the respective end of the rotating brush in the range of 1 cm to 5 cm.

13. The cleaning head according to claim 11, wherein the first support wheel (30) and the second support wheel (32) are each disposed at a distance (D) from the respective end of the rotating brush in the range of 2 cm to 4 cm.

14. The cleaning head according to any one of claims 1 to 5 and 9 to 13, further comprising a driving device for driving the first rotating brush and the second rotating brush in opposite directions of rotation.

15. The cleaning head of claim 14, wherein the driving device comprises: A single motor and a belt driver for driving the rotating brush; or A corresponding motor for each of the first and second rotating brushes.

16. The cleaning head according to any one of claims 1 to 5, 9 to 13 and 15, further comprising a fluid delivery device for delivering fluid to the first rotating brush and / or the second rotating brush.

17. A wet vacuum cleaner, comprising: The cleaning head according to any one of claims 1 to 16; A pump for delivering suction into the suction channel of the cleaning head; as well as A fluid reservoir delivers cleaning fluid to the cleaning head.

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