Vacuum pathway in a cleaning device

1. A vacuum cleaner comprising:

a plurality of extraction heads, each extraction head having a plurality of apertures in a floor facing surface;

a rotary head comprising a plurality of vacuum chambers positioned radially around a center channel having a top outlet, wherein the plurality of extraction heads is mounted to the rotary head, wherein each of the plurality of vacuum chambers comprises an inlet coupled in fluid receiving communication with a respective one of the extraction heads, wherein each of the plurality of vacuum chambers operably rotates around the center channel;

an evacuation tank;

a non-rotating riser having a bottom inlet disposed along a horizontal plane from and non-concentric with the top outlet of the center channel, and a top inlet connecting to the evacuation tank;

a plenum laterally disposed to the floor when cleaning the floor and connecting the center channel top outlet and the non-rotating riser bottom inlet, such that the plurality of vacuum chambers, central channel, plenum, and non-rotating riser form a vacuum pathway; and

a vacuum motor coupled to the non-rotating riser,

wherein a vacuum created by the vacuum motor draws fluid from the apertures of the extraction heads through the vacuum pathway.

2. The vacuum cleaner of claim 1 , wherein a cross-sectional area of the vacuum pathway is in the range of between 0.8 and 7 square inches.

3. The vacuum cleaner of claim 1 , wherein a ratio of cross-sectional area of the vacuum pathway in the riser to a summed cross-sectional area of the plurality of apertures in the plurality of extraction heads is 5 to 1.

4. The vacuum cleaner of claim 1 , wherein the vacuum pathway comprises at most two 90 degree bends.

5. The vacuum cleaner of claim 1 , wherein the vacuum pathway changes direction no more than 180 degrees.

6. The vacuum cleaner of claim 1 , wherein the vacuum pathway is between 0.25 and 3.0 feet in length.

7. The vacuum cleaner of claim 1 , wherein the vacuum pathway is between 0.75 and 2.0 feet in length.

8. The vacuum cleaner of claim 1 , wherein the distance is a fluid pathway distance between the plurality of vacuum chambers and the non-rotating riser, wherein the distance is 4.5 inches.

9. A vacuum cleaner for cleaning a floor comprising:

a plurality of extraction heads, each extraction head having a plurality of apertures in a floor facing surface;

a rotary head comprising a top outlet and a plurality of vacuum chambers positioned radially around a center channel in fluid connection with the top outlet, wherein the plurality of extraction heads is mounted to the rotary head, wherein each of the plurality of vacuum chambers comprises an inlet coupled in fluid receiving communication with a respective one of the extraction heads, wherein each of the plurality of vacuum chambers operably rotates around the center channel;

an extraction tank;

a riser capable of connecting to the extraction tank and having a bottom inlet disposed laterally from the top outlet; and

a vacuum pathway coupled with and disposed between the plurality of extraction heads and the extraction tank through the riser,

wherein the vacuum pathway comprises tubes coupled with and disposed between the extraction heads and the plurality of vacuum chambers of the rotary head, the plurality of vacuum chambers connecting to the rotary head top outlet, the top outlet coupled with a plenum chamber disposed laterally to the floor when cleaning the floor and between the plurality of vacuum chambers and the riser, the plenum chamber coupled with the riser bottom inlet;

wherein a ratio of the cross-sectional area of the vacuum pathway in the plenum chamber to a cross-sectional area of one of the tube, the plurality of vacuum chambers, or the riser is between 1.7:1 and 1:1.

10. The vacuum cleaner of claim 9 , wherein a ratio of a cross-sectional area of the vacuum pathway in the plenum chamber to a summed cross-sectional area of the plurality of apertures in the plurality of extraction heads is 5 to 1.

11. The vacuum cleaner of claim 9 , wherein the vacuum pathway between the vacuum chamber and the riser comprises at most two 90° bends.

12. The vacuum cleaner of claim 9 , wherein a cross-sectional area of the vacuum pathway is between 0.8 and 7 square inches.

13. The vacuum cleaner of claim 9 , wherein internal surfaces of the vacuum pathway are smooth and substantially continuous.

14. The vacuum cleaner of claim 9 , wherein the vacuum pathway is between 0.25 and 3.0 feet in length.

15. The vacuum cleaner of claim 9 , wherein the vacuum pathway is between 0.75 and 2.0 feet in length.

16. The vacuum cleaner of claim 9 , wherein the vacuum pathway is 1 foot in length.

17. The vacuum cleaner of claim 9 , wherein the vacuum pathway changes direction no more than 180 degrees.

18. A vacuum cleaner for cleaning a floor, comprising:

a rotary head coupled to a plurality of extraction heads, each extraction head having a plurality of apertures in a floor facing surface;

an evacuation tank;

a vacuum motor, wherein the vacuum motor expels suctioned fluid into the evacuation tank;

a riser coupled to the vacuum motor, the riser having a bottom inlet; and

a vacuum pathway disposed between the extraction heads and the riser,

wherein the vacuum pathway comprises

tubes coupled with and disposed between the extraction heads and a plurality of vacuum chambers positioned radially around a center channel such that the plurality of vacuum chambers is concentric with the center channel, the center channel having a top outlet disposed laterally from the riser bottom inlet, and

a plenum chamber disposed laterally and coupled with the riser, and

wherein a ratio of a cross-sectional area of the vacuum pathway in the plenum chamber to a summed cross-sectional area of the plurality of apertures in the extraction heads about 5 to 1.