Mobile surface cleaner having a sparging device

• US 8,046,867 B2
• Filed: 01/19/2007
• Issued: 11/01/2011
• Est. Priority Date: 02/10/2006
• Status: Active Grant

• Current Assignee: Tennant Company
• Original Assignee: Tennant Company
• Inventors: Field, Bruce F., Gronlund, Patrick J.
• Primary Examiner(s): Hail; Joseph J
• Assistant Examiner(s): MCDONALD, SHANTESE L
• Application Number:
  US11/655,359
• Publication Number:
  US 20070186367A1
• Time in Patent Office: 1,747 Days
• Field of Search: 153/20, 204/80
• US Class Current: 15/320
• CPC Class Codes: A47L 11/302 having rotary tools
• CPC Class Codes: A47L 11/4011 Regulation of the cleaning machine by electric means; Control systems and remote control systems therefor
• CPC Class Codes: A47L 11/4083 Liquid supply reservoirs; Preparation of the agents, e.g. mixing devices
• CPC Class Codes: A47L 11/4088 Supply pumps; Spraying devices; Supply conduits
• CPC Class Codes: A61L 2/035 Electrolysis
• CPC Class Codes: A61L 2/186 Peroxide solutions
• CPC Class Codes: A61L 2202/11 Apparatus for generating biocidal substances, e.g. vaporisers, UV lamps
• CPC Class Codes: A61L 2209/213 Use of electrochemically treated water, e.g. electrolysed water or water treated by electrical discharge
• CPC Class Codes: C02F 1/4672 by electrooxydation

Abstract

A mobile surface cleaner is provided, which includes a mobile body configured to travel over a surface, a source of a liquid, a liquid dispenser, a flow path from the liquid source to the liquid dispenser, and an electrolyzing sparging device in fluid communication with the flow path.

Claims

1. A mobile surface cleaner comprising:

a mobile body configured to travel over a surface;

a source of a liquid;

a liquid dispenser;

a flow path from the liquid source to the liquid dispenser;

an electrolyzing sparging device in fluid communication with the flow path and which lacks an ion exchange membrane;

a functional generator in the flow path, which comprises an anode chamber and a cathode chamber separated by an ion exchange membrane and which electrochemically activates at least one of the liquid from the source or sparged liquid from the sparging device, wherein a flow of the liquid from the anode chamber is combined with a flow of the liquid from the cathode chamber along the flow path, or at the liquid dispenser to form a combined flow, or a combination thereof, which is dispensed from the liquid dispenser; and

a control circuit which applies power to the sparging device and the functional generator such that the sparging device is operable to generate nanobubbles in the liquid by electrolysis, wherein the nanobubbles have a size that is too small to break surface tension of the liquid.

2. The mobile surface cleaner of claim 1, wherein the electrolyzing sparging device comprises:

first and second electrically conductive electrodes, which are separated by a gap, wherein the flow path is in fluid communication with the gap.

3. The mobile surface cleaner of claim 2, wherein:

at least one of the first or second electrodes is tubular; and

the first and second electrodes are coaxial with one another.

4. The mobile surface cleaner of claim 3, wherein the electrolyzing sparging device further comprises:

a tubular dielectric mesh positioned in the gap between the first and second electrodes, and wherein one of the first and second electrodes comprises a solid tubular metallic plate and the other electrode comprises a tubular metallic mesh.

5. The mobile surface cleaner of claim 2, wherein the first and second electrodes are planar.

6. The mobile surface cleaner of claim 1, wherein:

the liquid source comprises a tank; and

the electrolyzing sparging device is coupled in the flow path, between the tank and the liquid dispenser.

7. The mobile surface cleaner of claim 1, wherein:

the liquid source comprises a tank; and

the electrolyzing sparging device is located at least partially within the tank.

8. The mobile surface cleaner of claim 1 wherein the electrolyzing sparging device comprises:

first and second electrically conductive electrodes, which are separated by a gap.

9. The mobile surface cleaner of claim 1 wherein the liquid source comprises a tank to carry a supply of the liquid and wherein the cleaner further comprises:

a pump in fluid communication with the flow path.

10. The mobile surface cleaner of claim 9, wherein the control circuit is configured to operate the sparging device and the functional generator on-demand and comprises:

a first operating mode during motion of the cleaner relative to the surface being cleaned, during which the control circuit energizes the pump to pump the liquid along the flow path, energizes the electrolyzing sparging device to sparge the liquid that is passed through the sparging device, energizes the functional generator to activate at least one of the liquid from the source or the sparged liquid from the sparging device, and delivers sparged, electrochemically activated liquid to the surface by the liquid dispenser; and

a second operating mode when the cleaner is at rest relative to the surface being cleaned, during which the control circuit de-energizes the pump to terminate flow of the liquid along the flow path and de-energizes the electrolyzing sparging device and the functional generator.

11. The mobile surface cleaner of claim 1 wherein the liquid source comprises a tank carried by the cleaner and wherein the cleaner further comprises:

a motorized cleaning head connected to the mobile body and comprising a cleaning tool;

a pump in fluid communication with the flow path, wherein the liquid dispenser is configured to apply sparged liquid to at least one of the elements of the group comprising the surface, the cleaning tool or both the surface and the cleaning tool; and

a fluid recovery device connected to the mobile body.

12. The mobile surface cleaner of claim 11, wherein the cleaning tool comprises a hard floor surface cleaning tool and the fluid recovery device comprises a vacuum squeegee connected to the mobile body to engage the surface.

13. The mobile surface cleaner of claim 12, wherein the hard floor surface cleaning tool comprises a hard floor scrub brush.

14. The mobile surface cleaner of claim 11, wherein:

the cleaning tool comprises a soft floor surface cleaning tool comprising a soil transfer roller or a soft floor extraction tool; and

the fluid recovery device comprises a vacuum extractor configured to remove liquid from at least one of the surface being cleaned or the cleaning tool.

15. A mobile surface cleaner comprising:

a mobile body configured to travel over a surface;

a tank carried by the mobile body;

a motorized cleaning head connected to the mobile body and comprising a cleaning tool;

a liquid dispenser;

a flow path from the tank to the liquid dispenser;

an electrolyzer onboard the cleaner, which sparges the liquid by electrolysis and comprises first and second electrically conductive electrodes, which are separated by a gap in fluid communication with the flow path and wherein the gap lacks an ion exchange membrane, wherein the electrolyzer is operable to generate nanobubbles in the liquid by electrolysis, which have a size that is generally too small to break surface tension of the liquid; and

a functional generator in the flow path, which comprises an anode chamber and a cathode chamber separated by an ion exchange membrane and which electrochemically activates at least one of the liquid from the liquid source or the sparged liquid from the electrolyzer.

16. The mobile surface cleaner of claim 15, wherein:

at least one of the first or second electrodes is tubular; and

the first and second electrodes are coaxial with one another.

17. The mobile surface cleaner of claim 16, wherein:

one of the first and second electrodes comprises a solid tubular metallic plate and the other electrode comprises a tubular metallic mesh.

18. The mobile surface cleaner of claim 15, wherein the first and second electrodes are planar.

19. The mobile surface cleaner of claim 15, wherein:

the electrolyzer is coupled in the flow path, between the tank and the liquid dispenser.

20. The mobile surface cleaner of claim 15, wherein:

the electrolyzer is located at least partially within the tank.

21. The mobile surface cleaner of claim 15 and further comprising:

a pump in fluid communication with the flow path.

22. The mobile surface cleaner of claim 21, wherein the cleaner comprises a control circuit, which is configured to operate the sparging device and the functional generator on-demand and comprises:

a first operating mode during motion of the cleaner relative to the surface being cleaned, during which the control circuit energizes the pump to pump the liquid along the flow path and the cleaner energizes the electrolyzer to sparge the liquid from the source of the liquid that is passed through the electrolyzer, energizes the functional generator to activate at least one of the liquid from the source or the sparged liquid from the electrolyzer, and delivers sparged, electrochemically activated liquid to the surface by the liquid dispenser; and

a second operating mode when the cleaner is at rest relative to the surface being cleaned, during which the control circuit de-energizes the pump to terminate flow of the liquid along the flow path and de-energizes the electrolyzer and the functional generator.

23. The mobile surface cleaner of claim 15 wherein cleaner further comprises:

a pump in fluid communication with the flow path, wherein the liquid dispenser is configured to apply the sparged liquid to at least one of the elements of the group comprising the surface, the cleaning tool or both the surface and the cleaning tool; and

a fluid recovery device connected to the mobile body.

24. The mobile surface cleaner of claim 23, wherein the cleaning tool comprises a hard floor surface cleaning tool and the fluid recovery device comprises a vacuum squeegee connected to the mobile body to engage the surface.

25. The mobile surface cleaner of claim 24, wherein the hard floor surface cleaning tool comprises a hard floor scrub brush.

26. The mobile surface cleaner of claim 23, wherein:

the cleaning tool comprises a soft floor surface cleaning tool comprising a soil transfer roller or a soft floor extraction tool; and

the fluid recovery device comprises a vacuum extractor configured to remove liquid from at least one of the surface being cleaned or the cleaning tool.

27. A mobile surface cleaner comprising:

a mobile body configured to travel over a surface;

a source of a liquid;

a liquid dispenser;

a flow path from the liquid source to the liquid dispenser;

means for sparging onboard the cleaner, which sparges the liquid by electrolysis without an ion exchange membrane to generate nanobubbles in the liquid that have a size that is generally too small to break surface tension of the liquid; and

functional generator means in the flow path, which comprises an anode chamber and a cathode chamber separated by an ion exchange membrane for electrochemically activating at least one of the liquid from the source or sparged liquid from the means for sparging.

28. A mobile surface cleaner comprising:

a mobile body configured to travel over a surface;

a source of a liquid;

a liquid dispenser;

a flow path from the liquid source to the liquid dispenser;

an electrolyzing sparging device in fluid communication with the flow path, which comprises first and second electrically conductive, coaxial electrodes, which are separated by a gap that lacks an ion exchange membrane, wherein the flow path is in fluid communication with the gap, a tubular dielectric mesh positioned in the gap between the first and second electrodes, and wherein at least one of the first and second electrodes comprises a tubular metallic mesh;

a functional generator in the flow path, which comprises an anode chamber and a cathode chamber separated by an ion exchange membrane and which electrochemically activates sparged liquid from the sparging device; and

a control circuit which applies power to the sparging device and the functional generator such that the sparging device is operable to generate nanobubbles in the liquid by electrolysis, wherein the nanobubbles have a size that is too small to break surface tension of the liquid.

29. A mobile surface cleaner comprising:

a mobile body configured to travel over a surface;

a source of a liquid;

a liquid dispenser;

a flow path from the liquid source to the liquid dispenser;

an electrolyzing sparging device in fluid communication with the flow path;

a functional generator in the flow path, which comprises an anode chamber and a cathode chamber separated by an ion exchange membrane; and

a control circuit which applies power to the sparging device such that the sparging device is operable to generate nanobubbles in the liquid by electrolysis, and wherein the nanobubbles have a size that is too small to break surface tension of the liquid.

30. An apparatus comprising:

a source of a liquid;

a liquid dispenser;

a flow path from the liquid source to the liquid dispenser;

an electrolyzing sparging device in fluid communication with the flow path and comprising first and second electrically conductive electrodes, which are separated by a gap that lacks an ion exchange membrane;

a functional generator in the flow path, which comprises an anode chamber and a cathode chamber separated by an ion exchange membrane and which electrochemically activates at least one of the liquid from the source or sparged liquid from the sparging device; and

a control circuit which applies power to the sparging device and the functional generator such that the sparging device is operable to generate nanobubbles in the liquid by electrolysis, and wherein the nanobubbles have a size that is too small to break surface tension of the liquid.