Air and liquid separator for a carpet extractor

• US 5,779,744 A
• Filed: 05/09/1997
• Issued: 07/14/1998
• Est. Priority Date: 05/09/1997
• Status: Expired due to Term

• Current Assignee: Healthy Gain Investments Limited
• Original Assignee: Hoover Company (Whirlpool Corporation)
• Inventors: Lesco, Erik D., Mueller, David G.
• Primary Examiner(s): SMITH, DUANE
• Application Number:
  US08/853,595
• Time in Patent Office: 431 Days
• Field of Search: 55/DIG. 3, 55/248, 55/246, 55/449, 55/447, 55/418, 55/419, 55/437, 55/439, 55/462, 55/465, 55/471, 55/472, 55/466, 55/423, 55/410, 15/350, 15/353, 15/347
• US Class Current: 96/331
• CPC Class Codes: A47L 11/30 by suction
• CPC Class Codes: A47L 11/34 Machines for treating carpets in position by liquid, foam, or vapour, e.g. by steam
• CPC Class Codes: A47L 11/4013 Contaminants collecting devices, i.e. hoppers, tanks or the like
• CPC Class Codes: A47L 11/4027 Filtering or separating contaminants or debris
• CPC Class Codes: A47L 11/4097 Means for exhaust-air diffusion; Exhaust-air treatment, e.g. air purification; Means for sound or vibration damping
• CPC Class Codes: A47L 7/0028 Security means, e.g. float valves or level switches for preventing overflow
• CPC Class Codes: A47L 7/0038 with means for emptying the tanks
• CPC Class Codes: A47L 7/0042 Gaskets; Sealing means
• CPC Class Codes: A47L 9/102 Dust separators cyclones A47L9/16
• CPC Class Codes: B01D 45/06 by reversal of direction of flow
• CPC Class Codes: Y10S 55/03 Vacuum cleaner

Abstract

An air/liquid separator is provided in a hollow, preferably transparent, removable lid on a recovery tank of a wet pickup suction cleaner. The lid has a wall therein dividing the lid into an inlet/separating chamber and an exit chamber. Liquid and dirt entrained working air enters the inlet chamber and flows horizontally across the inlet chamber over a plurality of discharge openings passing through the lid bottom plate, such that the stream of dirty liquid and air is redirected downward through the discharge openings into the recovery tank. The plurality of discharge openings in the lid bottom plate are arranged generally progressively along the stream of liquid and air entering and flowing across the inlet chamber. The discharge openings preferably increase in size moving downstream in the inlet chamber, i.e. away from the entry into the inlet chamber. The exit chamber fluidly communicates with the interior of the recovery tank through an exit opening passing through the lid bottom plate. A vacuum is preferably drawn upon the exit chamber by an electric fan for providing the required working air flow through the combined air/liquid separator.

Claims

1. A combined air-liquid separator and liquid recovery tank for use with a carpet extractor, said combined air-liquid separator and liquid recovery tank comprising:

a liquid recovery tank;

a separator including a generally horizontal top plate located in an upper portion of the recovery tank, a generally horizontal bottom plate located in the upper portion of the recovery tank and spaced below the top plate, a peripheral wall extending between the top plate and the bottom plate enclosing a separating chamber in the space between the top and bottom plates;

the separator having an inlet opening to the separating chamber for receiving a stream of liquid laden air into the separating chamber and the bottom plate having a plurality of discharge openings passing therethrough communicating the separating chamber with the recovery tank, whereby liquid separated from the stream of liquid laden air traveling through the separating chamber drops through the discharge openings and is recovered in the recovery tank; and

wherein the plurality of discharge openings are arranged progressively along the stream of liquid laden air traveling through the separating chamber.

2. A combined air-liquid separator and liquid recovery tank according to claim 1, wherein the discharge openings increase in size moving away from the inlet opening.

3. A combined air-liquid separator and liquid recovery tank according to claim 2, wherein there are four said discharge openings.

4. A combined air-liquid separator and liquid recovery tank according to claim 3, wherein the discharge openings have a total cross-sectional area that is greater than a cross-sectional area of the inlet opening.

5. A combined air-liquid separator and liquid recovery tank according to claim 1, wherein the bottom plate has the inlet opening passing therethrough adjacent the peripheral wall.

6. A combined air-liquid separator and liquid recovery tank according to claim 1, wherein the discharge openings are arranged in a row that is substantially aligned with the inlet opening, such that the stream of liquid laden air flows sequentially over the plurality of discharge openings.

7. A combined air-liquid separator and liquid recovery tank according to claim 1, further comprising a drip wall extending from a lower surface of the bottom plate and surrounding the plurality of discharge openings.

8. A combined air-liquid separator and liquid recovery tank according to claim 1, wherein the recovery tank has an exhaust opening operatively communicating the recovery tank with ambient atmosphere, whereby air entering the inlet opening passes through the separating chamber, through the recovery tank, through the exhaust opening and is exhausted to the ambient atmosphere.

9. A combined air-liquid separator and liquid recovery tank according to claim 1, further comprising a dividing wall extending between the top plate and the bottom plate dividing the space between the top plate, bottom plate and inside the peripheral wall into the separating chamber and an exit chamber;

and

wherein the bottom plate has an exit opening passing therethrough that communicates the recovery tank with the exit chamber and the exit chamber has an exhaust opening that communicates the exit chamber with ambient atmosphere.

10. A combined air-liquid separator and liquid recovery tank according to claim 9, wherein the recovery tank is an open top tank and the top plate and bottom plate define a hollow lid that is removably mounted to and seals the top of the tank.

11. A combined air-liquid separator and liquid recovery tank according to claim 1, wherein at least the top plate is formed of substantially transparent material so that an operator may visually observe the liquid flowing through the separating chamber.

12. A combined air-liquid separator and liquid recovery tank according to claim 1, wherein a portion of the peripheral wall opposite the inlet opening is concave toward the inlet opening and arranged such that the peripheral wall causes air and liquid passing completely over the plurality of discharge openings to substantially reverse direction and travel along one side of the separating chamber generally toward the inlet opening.

13. A combined air-liquid separator and liquid recovery tank according to claim 12, further comprising a deflection surface on the one side of the separating chamber for deflecting the air and liquid traveling along the one side of the separating chamber laterally across the separating chamber, such that the deflected air and liquid collides with the stream of air and liquid entering the separating chamber.

14. A combined air-liquid separator and liquid recovery tank according to claim 1, further comprising drip bump on a lower surface of the top plate located centrally over at least one of the discharge openings.

15. A combined air-liquid separator and liquid recovery tank according to claim 9, further comprising a drip bump on a lower surface of the top plate located centrally over one of the exit openings and at least one of the discharge openings.

16. A combined air-liquid separator and liquid recovery tank according to claim 15, wherein there are two said drip bumps, one drip bump is located centrally over the exit opening and the other drip bump is located over one of the discharge openings.

17. A combined air-liquid separator and liquid recovery tank according to claim 9, wherein the discharge openings increase in size moving away from the inlet opening.

18. A combination air-liquid separator and liquid recovery tank, for use in combination with a wet pickup suction cleaner having a wet pickup nozzle and a motor fan assembly for drawing a stream of air and liquid in through the nozzle, said combination separator and recovery tank comprising:

an open top recovery tank adapted to be removably mounted to such a wet pickup cleaner;

a hollow lid sealingly and removably mounted to the top of the tank, the hollow lid defining an inlet chamber therein, the inlet chamber having an inlet opening fluidly communicating the inlet chamber with the nozzle when the tank is mounted to the cleaner and the lid is mounted to the tank, and the inlet chamber having a plurality of discharge openings fluidly communicating the inlet chamber with the tank, whereby the motor fan assembly is in fluid communication with the nozzle and the inlet opening such that the motor fan assembly causes a stream of air and liquid to be drawn in through the nozzle and flow through the inlet opening into the inlet chamber where the liquid is separated from the air, drops through the discharge openings and is recovered in the recovery tank, and

wherein the plurality of discharge openings are arranged progressively along the stream of air and liquid entering the inlet chamber.

19. A combination separator and recovery tank according to claim 18, wherein the plurality of discharge openings increase in size moving away from the inlet opening.

20. A combination separator and recovery tank according to claim 18, wherein there are four of said discharge openings.

21. A combination separator and recovery tank according to claim 20, wherein the discharge openings have a total cross-sectional area that is greater than a cross-sectional area of the inlet opening.

22. A combination separator and recovery tank according to claim 18, wherein the lid comprises a top plate and a bottom plate connected by a peripheral outer wall defining said inlet chamber between the top plate, the bottom plate and the peripheral wall, and the bottom plate having the plurality of discharge openings.

23. A combination separator and recovery tank according to claim 22, wherein a dividing wall extends between the top plate and bottom plate dividing the lid into the inlet chamber and an exit chamber.

24. A combination separator and recovery tank according to claim 23, wherein said bottom plate has an exit opening passing therethrough communicating the exit chamber with the recovery tank, and the exit chamber has an outlet opening communicating the exit chamber with an intake side of the motor fan assembly.

25. A combination separator and recovery tank according to claim 22, wherein said inlet opening is disposed substantially to one side of said inlet chamber.

26. A combination separator and recovery tank according to claim 24, wherein the plurality of discharge openings increase in size moving away from the inlet opening.

27. A combination separator and recovery tank according to claim 26, wherein there are four of said discharge openings.

28. A combination separator and recovery tank according to claim 27, wherein the discharge openings have a total cross-sectional area that is greater than a cross-sectional area of the inlet opening.

29. A combination liquid recovery tank and air-liquid separator for use in combination with a carpet extractor having a motor/fan assembly for creating a working airstream, the working airstream having entrained liquid when the carpet extractor is in use, the combination cleaning solution recovery tank and air-liquid separator comprising:

a tank;

a separating chamber located in an upper portion of the tank, the separating chamber having an inlet opening in fluid communication with the working airstream, whereby the working airstream flows through the inlet opening and through the separating chamber, and the separating chamber having a plurality of discharge openings providing fluid communication between the separating chamber and the tank;

wherein the plurality of discharge openings are arranged generally progressively away from the inlet opening.

30. A combination liquid recovery and air-liquid separator according to claim 29, wherein the plurality of discharge openings increase in size moving away from the inlet opening.

31. A combination liquid recovery and air-liquid separator according to claim 30, wherein there are four of said discharge openings.

32. A combination liquid recovery and air-liquid separator according to claim 31, wherein the four discharge openings have a total cross-sectional area that is greater than a cross-sectional area of the inlet opening.

33. A combination liquid recovery and air-liquid separator according to claim 29, filter comprising a drip wall surrounding the plurality of discharge openings and extending into the tank.

34. A combination liquid recovery and air-liquid separator according to claim 29, wherein the separating chamber is defined by a lid that is removably mounted to a top of the tank.

35. A combination liquid recovery and air-liquid separator according to claim 34, wherein the inlet opening is located to one side of the separating chamber.

36. A combination liquid recovery and air-liquid separator according to claim 34, wherein the lid is defined by a top plate and a bottom plate spaced beneath the top plate and the bottom plate has the inlet opening passing therethrough adjacent one side of the lid, whereby the working airstream enters the separating chamber vertically through the inlet opening, performs a sudden 90 degree change in direction and flows horizontally through the separating chamber.

37. A combination liquid recovery and air-liquid separator according to claim 36, wherein there are four of said discharge openings.

38. A combination liquid recovery and air-liquid separator according to claim 37, wherein the four discharge openings have a total cross-sectional area that is greater than a cross-sectional area of the inlet opening.

39. A combination liquid recovery and air-liquid separator according to claim 29, wherein a dividing wall extends between the top plate and the bottom plate and divides the space between the top plate and bottom plate into two chambers, one chamber being the separating chamber and the other chamber being an exit chamber;

and

the bottom plate has an outlet opening passing therethrough communicating the exit chamber with the tank, and the exit chamber has an exhaust opening that communicates the exit chamber with the external atmosphere, whereby air that has been separated from the liquid exits the tank via the outlet opening, exit chamber and exhaust opening and is exhausted to the atmosphere.

40. A combination liquid recovery tank and air-liquid separator according to claim 39, wherein the exhaust opening is in fluid communication with the motor/fan assembly, whereby the motor/fan assembly draws the working airstream in through the inlet chamber and through the tank, such that the liquid is separated from the air and recovered in the tank, and the air in the tank is drawn by the motor/fan assembly out through the exit chamber and exhausted to the atmosphere.

41. A combination liquid recovery and air-liquid separator according to claim 39, further comprising a drip wall extending from the bottom plate into the tank and surrounding the discharge openings.

42. An air and water separator for use with a wet pickup floor care appliance, said separator comprising:

a generally horizontal upper wall and a generally horizontal lower wall interconnected by a peripheral wall extending between the upper and lower walls defining a separating chamber, the separating chamber having an inlet opening for receiving a stream of air and water into and through the separating chamber; and

the lower wall having a plurality of discharge openings passing therethrough, the plurality of discharge openings being arranged generally progressively further away from the inlet opening, whereby the stream of air and liquid flows generally sequentially over the plurality of discharge openings with air and water being generally sequentially drawn through each of the discharge openings causing the remaining air and water in the separating chamber to expand and slow causing the water to separate from the air and drop through the discharge openings.

43. A separator according to claim 42, wherein the discharge opening increase in size moving away from the inlet opening.

44. A separator according to claim 43, wherein there are four of said discharge openings.

45. A separator according to claim 42, further comprising a drip wall extending from the bottom plate and surrounding the discharge openings.