Liquid level controller

• US 20050039796A1
• Filed: 08/26/2002
• Published: 02/24/2005
• Est. Priority Date: 12/12/2001
• Status: Active Grant

• Current Assignee: Pong Kit Chan
• Original Assignee: Pong Kit Chan
• Inventors: Chan, Pong Kit
• Granted Patent: US 7,284,567 B2
• Time in Patent Office: Days
• US Class Current: 137/413
• CPC Class Codes: E03D 1/32 Arrangement of inlet valves devices for reducing noise E03D9/14 ; noise-reducing means E03D11/00
• CPC Class Codes: F16K 21/18 closed when a rising liquid reaches a predetermined level float-actuated valves F16K31/18
• CPC Class Codes: F16K 31/385 the fluid acting on a diaphragm
• CPC Class Codes: G05D 9/02 without auxiliary power
• CPC Class Codes: Y10T 137/7371 Fluid pressure
• CPC Class Codes: Y10T 137/7374 Flexible diaphragm valve
• CPC Class Codes: Y10T 137/7413 Level adjustment or selection means

Abstract

A liquid level controller for maintaining the level of liquid in a tank at a predetermined height includes a housing with an upper and lower section wherein the upper section is connected to a liquid supply and the lower section is submerged in liquid the level of which is to be maintained. The upper section includes a pressure chamber and an outlet chamber divided by a resilient material; a bore extending through the resilient material; and an inlet tube extending from the supply to the bore. A control valve controls the liquid flow through a hole providing communication between the pressure chamber and the lower part of the housing.

Claims

1-25. -25. (Canceled)

26. A liquid level controller comprising:

a housing having an upper and lower section, said upper section being adapted to be detachably connected to a liquid supply, and wherein a portion of said lower section is adapted to be submerged within a liquid the level of which is to be maintained;

a pressure chamber within said upper section, said pressure chamber having a hole to provide liquid communication between the said pressure chamber and an inner part of the lower section of the said housing;

a seal made of resilient material having a bore there through;

an inlet tube having an outlet and extending from the liquid supply to said bore;

said seal located between the inlet tube outlet and the pressure chamber;

an outlet tube within said lower section of said housing;

a displacer slidably along said outlet tube;

a valve assembly for controlling liquid flow, said valve assembly including a control pin with one end attached to a control valve and another end coupled to said displacer acting as a weight movable to tip said control pin to open said control valve when a liquid level is below a level to be maintained, and wherein said displacer floats to remove tipping of the control pin to close said control valve when the liquid level to be maintained is reached.

27. The liquid level controller as claimed in claim 26, wherein said outlet tube has an outlet opening diameter smaller than the diameter of the said displacer.

28. The liquid level controller as claimed in claim 26, wherein said pressure chamber includes projections extending towards a surface of the seal opposite the inlet tube outlet.

29. The improved liquid level controller as claimed in claim 28, wherein said pressure chamber includes a pin like structure extending between said projections toward the center of bore in the said seal.

30. The liquid level controller as claimed in claim 26, wherein said control valve is a plug with rubber ‘

O’

ring around it and wherein said plug is connected to one end of the control pin; and

a spring associated with the control pin biasing the valve assembly to revert to its original position.

31. The liquid level controller as claimed in claim 26, wherein said inlet section of the apparatus and the liquid supply is connected by an attachment device having a flexible grip mounted thereon to provide stability when the liquid level controller is mounted to the wall of a liquid container.

32. The liquid level controller as claimed in claim 26, wherein said upper section of said housing comprises a control chamber at the end of said upper section.

33. The liquid level controller as claimed in claim 32, wherein said control chamber comprises a limit node protruding into said control chamber for preventing said valve assembly being pulled excessively downward by said displacer.

34. The liquid level controller as claimed in claim 26, wherein said displacer includes a weight at a top part thereof and a float at a bottom part thereof, said float comprising a hollow body providing buoyancy to the said weight when said weight is submerged in water.

35. The liquid level controller as claimed in claim 26, wherein said lower section of the said housing includes a controller and a thread having one end connected to said controller and another end extending through said control pin and to said displacer for enabling adjustment of a preferred liquid level.

36. The liquid lever controller as claimed in claim 35, wherein said control pin comprises a ring for said thread to pass there through so as to reduce the pulling force by the displacer.

37. A liquid level controller comprising:

a housing having an upper and lower section, said lower section being adapted to be detachably connected to a liquid supply, said housing adapted to be submerged within a liquid the level of which is to be maintained;

a pressure chamber within said lower section, said pressure chamber having a hole to provide liquid communication between said pressure chamber and an inner part of an upper section of the said housing;

a seal made of resilient material having a bore there through;

an inlet tube having an outlet and extending from the liquid supply to said bore;

said seal located between the inlet tube outlet and the pressure chamber;

an outlet tube within said upper section of said housing;

a displacer slidably along said outlet tube;

a valve assembly for controlling liquid flow, said valve assembly including a control pin with one end attached to a control valve and another end coupled to said displacer acting as a weight moveable to tip said control pin to open said control valve when a liquid level is below a level to be maintained, and wherein said displacer floats to remove tipping of the control pin when the liquid level to be maintained is reached.

38. The liquid level controller as claimed in claim 37, wherein said control chamber comprises an elongated bore extending downwardly from the top end of said control chamber to substantially the middle of said control chamber.

39. The liquid level controller as claimed in claim 37, wherein said liquid level controller comprises a controller which is slidably fixed along said elongated hole by a fastener.

40. The liquid level controller as claimed in claim 37, wherein said liquid level controller is adapted to be mounted from the bottom of a container the level of which is to be maintained.

41. The liquid level controller as claimed in claim 37, wherein said pressure chamber comprises at least one outlet opening which is closed by said seal when said pressure chamber contains high liquid pressure.

42. A liquid level controller comprising:

a housing having an upper end attached to a liquid inlet and a lower end adapted to be submerged in liquid;

said housing further comprising a path extending from the inlet to a liquid outlet, and a seal made of resilient material preventing continuous flow between the said inlet and outlet;

said housing further comprising a vertically slidable displacer including weight at an upper section thereof and a float at a lower section thereof to keep the said weight afloat;

said displacer attached to one end of a control pin and the other end of said control pin coupled to a control valve;

whereby when a liquid level is below a level to be maintained, said displacer acting as a weight transmitting motion to tip said control pin to open said control valve thereby reducing the pressure on an opposite surface of the seal to permit continuous flow from the liquid inlet to the outlet.

43. The liquid level controller as claimed in claim 42, wherein the upper section of said outlet is blocked by a central portion of said seal.

44. The liquid level controller as claimed in claim 42, wherein said inlet is mounted at an outer periphery of said upper section of the outlet facing said seal.

45. The liquid level controller as claimed in claim 42, wherein said control pin is ‘

L’

shaped.

46. The liquid level controller as claimed in claim 42, wherein said control pin includes a ring attached at said end of the control pin which is coupled to said displacer.

47. The liquid level controller as claimed in claim 42, wherein said housing is provided with a controller mounted at the lower end of said housing and a thread having one end tied to said controller and the other end extending through the said ring of the control pin and to said displacer for enabling adjustment of a preferred liquid level.

48. The liquid level controller as claimed in claim 42, wherein said seal is rubber.