JP7384552B2 - Suction base for floor cleaning machine - Google Patents

Description

The present invention is a suction base for a floor cleaning machine, and includes a suction base basic body and a suction connection part, and the suction base basic body has a first end, a second end, and a front wall. and a rear wall part, a suction passage is formed between the front wall part and the rear wall part, and the suction passage has an upper part extending between the front wall part and the rear wall part. It is defined by a wall, the front wall and the rear wall extending away from the top wall, the rear wall extending in one plane for contacting the floor surface to be cleaned. the rear wall has an abutment edge which, when viewed in the plane of the abutment edge, of the connecting line between the first end and the second end of the suction base basic body; The suction base for a floor cleaning machine is curved to extend on the side facing away from the front wall, and the suction connection is in fluid connection with the suction channel.

Floor cleaning machines with suction bases are known in the prior art. Typically, a suction base is used to remove any liquid present on the floor to be cleaned from the floor. This usually takes place by means of a negative pressure applied to the suction base, which is supplied by a device provided for this purpose. The liquid to be removed then enters the suction channel in the suction base through the small slot opening.

Due to the small cross-section of the slot opening, the flow velocity in this region is extremely high, and its values can reach up to 130 m/s. Such high flow velocities in the region of the slot openings have the disadvantage that too much flow noise is generated when sucking up the liquid. Moreover, the use of small slot openings results in strong local variations in the flow velocity within the suction passage and thus non-uniformity. As a result of these drawbacks, there are regions in the suction channel where the flow velocity is too low for the liquid present there to be conveyed towards the suction connection using an air stream.

It is therefore an object of the invention to eliminate the drawbacks of the prior art mentioned above. In particular, a suction base should be provided which generates as little noise as possible during operation and/or which produces a uniform flow inside.

This problem is solved in that an impact wall is provided which is arranged on the side of the front wall opposite to the rear wall. In this case, the impingement wall is straight or convex when viewed in a direction facing away from the rear wall and has an abutment extending towards the floor surface to be cleaned. an edge, in which case the impingement wall is further spaced from the at least one end of the suction base basic body, so that in the region of the at least one end of the suction base basic body the abutment edge At least one free region without a section is provided in the front wall.

In the above sense, a convex impact wall is defined by a convex impact wall whose geometry differs from a straight line extending between the two end points of the impact wall, and where the wall extends behind this line. It is understood that this is a wall that extends only on the side facing away from the wall.

Preferably, the abutment edge of the collision wall lies in the plane of the abutment edge of the rear wall, in which case the collision wall and the abutment edge form a closed surface. . The abutting edge is therefore preferably the edge that rests on the floor to be cleaned when the suction base is placed on this floor. The abutment edge cooperates with the floor to form a suction channel, so that liquid can enter into the suction channel exclusively in the area of the front wall that is not covered by the impact wall. Therefore, when the suction base is installed on the floor, the plane of the abutting edge approximately corresponds to the plane of the floor. Closed surfaces of impingement walls and abutment edges are surfaces through which liquid cannot pass during operation. It is thus avoided that liquid passes through the closed surface, ie through the impingement wall, into the suction channel located behind it.

During operation of the floor cleaning machine with a suction base according to the invention, the suction base is moved over the floor to be cleaned in a direction approximately perpendicular to the impingement wall. In this case, the liquid present on the floor comes into contact with a straight or convex impact wall, and due to this shape of the impact wall, due to the movement of the suction base, the impact on the front wall It is deflected towards at least one free region without a border, ie towards the suction channel opening. In this region, liquid can enter into the suction channel. In the suction channel, the liquid is suctioned off by means of a suction connection to which negative pressure is applied, so that the liquid can be conveyed, for example, via a pipe connection into a liquid tank of a floor cleaning machine.

The suction base according to the invention has the advantage that high flow velocities in the area of small slot openings, as occur in the prior art, are avoided. As a result, the flow noise is significantly reduced when sucking liquid from the floor. Furthermore, by using at least one wicking passage opening in accordance with the present invention, the flow rate within the wicking passage is substantially uniform. That is, regions where the flow rate is too low to effectively transport liquid are avoided. Thereby, the liquid is reliably discharged from any location within the suction passage. After all, the suction base according to the invention is characterized by a simple and durable construction, which allows cost-effective production and requires only a small amount of maintenance effort.

In a preferred embodiment of the suction base according to the invention, the suction passage has a length extending between the first end and the second end of the basic suction base body. The shape of the suction channel can then be straight or curved along its length. This makes it possible to arrange at least one suction channel opening in the vicinity of the first or second end of the basic suction base body and thus to use the suction base over its entire length.

In another preferred embodiment of the suction base according to the invention, the suction channel has a height that is constant over the length of the suction channel or that increases with decreasing distance towards the suction connection. A constant height of the suction channel is understood to be a height that does not substantially change between the first end and the suction connection and/or between the second end and the suction connection. . This therefore means in particular that the height of the suction channel does not increase from the suction connection to the first end and/or the second end. Alternatively, the height of the suction channel may increase from the first end and/or the second end in the direction of the suction connection. A constant height of the suction channel has the advantage of achieving a uniform flow rate and thus a reliable discharge of the cleaning liquid.

In another preferred embodiment of the suction base according to the invention, the collision wall section is curved in a convex manner with respect to the connection line between the first end and the second end of the suction base basic body. . The convex form of the impact wall means that it is curved outwardly away from the basic suction base, ie perpendicularly away from the rear wall of the basic suction base. This shape has the advantage of efficiently directing the liquid present in front of the impingement wall towards the end of the impingement wall and thus towards the at least one suction channel opening.

In another preferred embodiment of the suction base according to the invention, the impingement wall is spaced apart from both ends of the suction base basic body, such that the first end and the second end of the suction base basic body are spaced apart from each other. In the region, two free regions without abutment edges, ie two suction channel openings, are provided in the front wall. For example, the impingement wall may be centrally located between the first end and the second end of the suction base basic body. Using two suction passage openings allows more liquid to enter the suction passage at the same time, and thus more liquid can be sucked up, than when using only one suction passage opening. , it has the advantage of Therefore, the suction-based blotting performance is significantly enhanced.

In another preferred embodiment of the suction base according to the invention, the suction connection is arranged on the upper wall of the suction channel, the suction passage having a first height in the area of the suction connection and a height of the suction connection. a second height in a surrounding area, the first height being lower than the second height, and the height of the suction passage with respect to the transition from the first height to the second height. , changes continuously in the transition region adjacent to the wicking connection. This local narrowing of the suction channel has the advantage that dirt removal is improved due to the improved flow guidance in this region.

The present invention will be explained below based on the drawings showing preferred embodiments.

1 is a side view of a floor cleaning machine with a suction base according to one embodiment of the invention; FIG. FIG. 3 is a perspective view of the first embodiment. It is a bottom view of a 1st aspect. FIG. 7 is a cross-sectional view of a wicking connection and wicking passageway according to another embodiment; FIG. 7 is a cross-sectional perspective view of another embodiment.

FIG. 1 shows a floor cleaning machine 1 with a front end 3 and a rear end 5 viewed in the direction of travel B. FIG. The floor cleaning machine 1 has a machine frame 7. Since the machine frame 7 is provided with a traveling device having a plurality of front wheels 9 and a plurality of rear wheels 11, the floor cleaning machine 1 can travel on the floor surface to be cleaned. Furthermore, the floor cleaning machine 1 has at its front end 3 a brush head 13 with brush elements. The brush head 13 is configured to spread liquid onto the floor to be cleaned and to clean the floor with the brush elements present in the brush head 13. The floor cleaning machine 1 has at its rear end 5 a suction base 15 according to an embodiment of the invention. The suction base 15 is configured to suck up liquid present on the floor and convey it via a conduit 17 into a liquid tank (not shown) of the floor cleaning machine 1 .

FIG. 2 shows a perspective view of one embodiment of the suction base 15 according to the invention shown in FIG. The suction base 15 has a suction base basic body 19 with a first end 21 and a second end 23 . Furthermore, the suction base basic body 19 has a front wall part 25 and a rear wall part 27. Further, the rear wall portion 27 has an abutting edge portion 29 . In this embodiment, the abutting edge 29 is provided for abutting against the floor surface to be cleaned. The rear wall 27 of the suction base 15 is arranged such that the rear wall 27 is on the side of the connection line V between the first end 21 and the second end 23 when viewed in the plane of the abutting edge 29 . The rear wall portion 27 is curved so as to extend on the side facing away from the front wall portion 25 . Furthermore, a suction connection portion 31 is provided on the upper wall portion 33 of the suction base 15 . The suction connection 31 is in fluid connection with the suction passage within the suction base 15 .

Furthermore, a collision wall portion 35 is provided. The collision wall portion 35 is arranged on the opposite side of the front wall portion 25 from the rear wall portion 27 . In this embodiment, the impingement wall 35 has a curved shape and is likewise provided with an abutment edge 37 . It is also conceivable that the collision wall portion 35 extends linearly between both ends thereof. A curved impingement wall 35 is understood to be a wall whose geometry differs from a wall extending straight between two points; Extends only to one side of the connecting line. In the embodiment described here, the abutting edges 29, 37 are the edges that abut the floor to be cleaned when the suction base 15 is placed on the floor. The abutment edges 29, 37 cooperate with the floor to form a suction channel, so that the liquid only flows in the area of the front wall 25 that is not covered by the impingement wall 35, ie in the area of the suction channel opening. can enter into the suction passage. Therefore, when the suction base 15 is installed on the floor, the planes of the abutting edges 29, 37 substantially coincide with the plane of the floor. The collision wall 35 and its abutment edge 37 form a closed surface, ie a surface without openings. That is, liquid cannot enter through this surface. It is thus avoided that liquid passes through the closed surface, ie through the impingement wall 35, into the suction channel located behind it.

In this embodiment, it is also conceivable that the contact edge 37 extends, for example, in a wave shape and does not contact the floor surface to be cleaned over its entire length. If the shape of the abutting edge is such that the abutting edge 37 is always in contact with the liquid when the cleaning liquid is spread on the floor surface to be cleaned, the effects of the present invention can also be achieved with this type of embodiment. be able to.

The impingement wall 35 is spaced apart from the first end 21 and the second end 23 so that two free areas, ie two suction channel openings 39, are provided. These suction channel openings 39 are not covered by the abutment edges 29, 37. It is also conceivable that a single suction passage opening 39 is provided, which is arranged adjacent to the first end 21 or the second end 23. Furthermore, it is also conceivable for the suction base 15 to have three or more suction passage openings 39.

The suction base 15 according to the invention has the advantage that high flow velocities in the area of small slot openings, as occur in the prior art, are avoided. As a result, the flow noise is significantly reduced when sucking liquid from the floor. Furthermore, by using two suction passage openings 39 in accordance with the present invention, the flow rate within the suction passage is substantially uniform. That is, regions where the flow rate is too low to effectively transport liquid are avoided. Thereby, the liquid is reliably discharged from any location within the suction passage. After all, the suction base 15 according to the invention is characterized by a simple and robust construction, which allows cost-effective manufacture and requires only a small amount of maintenance effort.

FIG. 3 shows a bottom view of one embodiment of the suction base 15 according to the invention. The suction base 15 has a suction passage 41 . The suction passage 41 is formed by the front wall part 25, the rear wall part 27, and the upper wall part 33. The suction passage 41 has a length extending between the first end 21 and the second end 23 of the suction base basic body 19 . It is also conceivable that the length of the suction channel 41 extends only in a partial region of the section between the first end 21 and the second end 23 of the suction base basic body 19 . In this case, the shape of the suction channel may be straight or curved along the length of the suction channel.

Furthermore, the suction passage 41 has a height that is constant over the length of this suction passage 41. A constant height of the suction passage 41 is a height that does not substantially change between the first end 21 and the suction connection 31 and/or between the second end 23 and the suction connection 31. It is understood that there is. This therefore means in particular that the height of the suction channel 41 from the suction connection 31 to the first end 21 and/or the second end 23 does not increase. Alternatively, it is also conceivable that over the length of the suction channel 41 the height of the suction channel 41 increases with decreasing distance towards the suction connection 31 . A constant height of the suction channel has the advantage of creating a uniform flow within the channel.

The impingement wall 35 has a convexly curved shape in the preferred embodiment described herein. That is, the collision wall portion 35 is curved in the direction B with respect to the connection line V between the first end 21 and the second end 23 of the suction base basic body 19 . In other words, the convex form of the collision wall 35 means that it extends outwardly from the suction base basic body 19, that is, toward the opposite side of the front wall 25 of the suction base basic body 19 from the rear wall 27. This refers to the collision wall portion 35 that is curved in the vertical direction. The convex shape of the collision wall 35 allows the collision wall 35 to particularly efficiently move the liquid present in front of the collision wall 35 toward the plurality of ends of the collision wall 35 and, in turn, to the suction passage opening. It has the advantage of leading towards 39.

The functions of the suction base 15 are as follows. In use, the suction base 15 is moved over the floor to be cleaned in a direction B, for example perpendicular to the connecting line V. Any other direction of movement perpendicular to the impact wall 35 is also conceivable. When the suction base 15 is moved, the liquid present on the floor comes into contact with the collision wall 35 , and due to the curved shape of the collision wall 35 , due to the movement of the suction base 15 , the liquid present on the floor comes into contact with the front wall 25 . It is deflected towards the free region without abutment edges 29, 37, ie towards the suction channel opening 39. The direction of movement of the liquid is indicated schematically by arrows 43a, 43b. In the area of the suction channel opening 39, liquid can enter the suction channel 41 (see arrow 43c). In the suction passage 41, liquid is sucked in and sucked out by the suction connection 31 to which negative pressure is applied (see arrows 43d and 43e). Following this, the liquid can be conveyed, for example via line 17, into the liquid tank.

4 and 5 show a sectional view of the suction connection 31 and the suction channel 41 of a further embodiment of the suction base 15 according to the invention. The suction base 15 is installed on the floor surface 45 to be cleaned. The suction connection portion 31 is arranged within the upper wall portion 33 of the suction passage 41 . The suction channel 41 has a first height H ₁ in the area of the suction connection 31 and a second height H ₂ in the area around the suction connection 31 . In this embodiment, the first height _H1 is lower than the second height _H2 . Furthermore, the height of the suction channel 41 changes continuously from a first height H ₁ to a second height H ₂ in a transition region 47 adjacent to the suction connection 31 . It is also conceivable that the transition portion is formed in a step-like manner. This local narrowing of the suction channel 41 in the transition region 47 has the advantage that dirt removal is improved due to the improved flow guidance in this region.

Claims (7)

A suction base for a floor cleaning machine,
Comprising a suction base basic body (19) and a suction connection part (31),
The suction base basic body (19) has a first end (21), a second end (23), a front wall (25), and a rear wall (27), and the front wall A suction passage (41) is formed between the front wall part (25) and the rear wall part (27), and the suction passage (41) is formed between the front wall part (25) and the rear wall part (27). ) is defined by a top wall (33) extending between the
The front wall (25) and the rear wall (27) extend in a direction away from the upper wall (33), and the rear wall (27) is connected to the floor surface (45) to be cleaned. an abutting edge (29) extending in one plane for abutting the
The rear wall portion (27), when viewed in the plane of the abutting edge portion (29), is connected to the first end portion (21) and the second end portion (23) of the suction base basic body (19). ) is curved so as to extend on the side of the connecting line facing away from the front wall (25);
In a suction base for a floor cleaning machine, the suction connection (31) is in fluid connection with the suction passageway (41);
a collision wall (35) is provided, the collision wall (35) being arranged on the opposite side of the front wall (25) from the rear wall (27);
The collision wall part (35) is linear or has a convex shape when viewed in a direction opposite to the rear wall part (27), and the collision wall part (35) is It has a connecting edge part (37), and the corresponding connecting edge part (37) extends toward the floor surface (45) to be cleaned,
Furthermore, the impingement wall (35) is spaced apart from at least one end (21, 23) of the suction base basic body (19), so that the at least one end (21, 23) of the suction base basic body (19) In the region of the ends (21, 23), at least one free region without the abutment edge (29, 37) is located on the side of the floor (45) to be cleaned of the front wall (25). It is provided ,
The front wall (25) is connected to the rear wall (27) at the first end (21) and the second end (23) of the suction base basic body (19). A suction base for floor cleaning machines. The abutment edge (37) of the collision wall (35) is located in the plane of the abutment edge (29) of the rear wall (27), and the collision wall (35) and the 2. Suction base for a floor cleaning machine according to claim 1, characterized in that the abutment edge (37) forms a closed surface. The suction passage (41) has a length extending between the first end (21) and the second end (23) of the suction base basic body (19). The suction base for a floor cleaning machine according to claim 1 or 2. Said suction channel (41) is characterized in that it has a height that is constant over said length of said suction channel (41) or that increases with decreasing distance towards said suction connection (31). The suction base for a floor cleaning machine according to claim 3. The collision wall (35) is curved in a convex shape with respect to a connection line between the first end (21) and the second end (23) of the suction base basic body (19). A suction base for a floor cleaning machine according to any one of claims 1 to 4, characterized in that: The collision wall (35) is spaced apart from both ends of the suction base basic body (19), thereby allowing the first end (21) and the first suction base basic body (19) to separate from each other. Claim 2, characterized in that, in the region of the two ends (23), two free regions without the abutment edges (29, 37) are provided on the front wall (25). A suction base for a floor cleaning machine according to any one of items 1 to 5. The suction connection (31) is arranged on the upper wall (33) of the suction passage (41), and the suction passage (41) is arranged in a first section in the area of the suction connection (31). and a second height in a region around the suction connection (31), the first height being lower than the second height and the height of the suction passageway (41). changes continuously in a transition region (47) adjacent to the suction connection (31) with respect to the transition from the first height to the second height. A suction base for a floor cleaning machine according to any one of items 1 to 6.