Gas pressure driven tank fluid pump having float and snap-acting rotary valve

• US 6,808,370 B1
• Filed: 08/08/2002
• Issued: 10/26/2004
• Est. Priority Date: 08/08/2002
• Status: Active Grant

• Current Assignee: Spirax-Sarco Limited (Spirax-Sarco Engineering PLC)
• Original Assignee: Spirax-Sarco Limited (Spirax-Sarco Engineering PLC)
• Inventors: Soares, Jairo Luiz
• Primary Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US10/214,513
• Time in Patent Office: 810 Days
• Field of Search: 417/126, 417/131, 417/132, 417/133, 417/130, 417/134, 417/135, 137/199, 137/398, 137/209, 137/418, 137/420, 137/196, 137/447, 137/560, 137/565.01, 137/565.11, 137/565.12, 137/565.13, 137/565.35, 261/19, 261/73, 251/75, 430/0, 432/5
• US Class Current: 417/131
• CPC Class Codes: F04F 1/06 the fluid medium acting on the surface of the liquid to be pumped F04F1/02 takes precedence
• CPC Class Codes: F16K 11/074 with flat sealing faces
• CPC Class Codes: F16K 31/30 actuating a gate valve or sliding valve
• CPC Class Codes: F16K 31/563 for rotating or pivoting valves
• CPC Class Codes: Y10T 137/7323 By float
• CPC Class Codes: Y10T 137/7394 Trip mechanism

Abstract

A gas pressure driven fluid pump comprising a pump tank having a liquid inlet and a liquid outlet. A float, carried within the interior of the pump tank, is operable to move between a low level position and a high level position. A snap-acting valve is operatively connected to the float. The snap acting valve has a rotatable port member that moves so as to switch to exhaust porting when the float falls to the low level position. The port member further switches to motive porting when the float rises to the high level position. As a result, fluid filling the pump tank causes the float to rise from the low level position to the high level position during exhaust porting. Fluid exiting the pump tank causes the float to fall from the high level position to the low level position due to introduction of motive gas during motive porting.

Claims

1. A gas pressure driven fluid pump, said pump comprising:

a pump tank having a liquid inlet and a liquid outlet;

a float carried within the interior of said pump tank, said float being operable to move between a low level position and a high level position;

a snap-acting valve operatively connected to said float, said valve having a rotatable port member that moves so as to switch to exhaust porting when said float reaches said low level position and to switch to motive porting when said float reaches said high level position; and

whereby fluid filling said pump tank causes said float to rise from said low level position to said high level position during said exhaust porting and fluid exiting said pump tank causes said float to fall from said high level position to said low level position due to introduction of motive gas during said motive porting.

2. A pump as set forth in claim 1, wherein said valve comprises:

an actuator member connected to said float so as to directly rotate as said float moves between said low level position and said high level position; and

a mechanism operatively interconnecting said actuator member and said port member such that said rotation of said actuator member will cause selective rotation of said port member.

3. A pump as recited in claim 2, wherein said mechanism interconnecting said actuator member and said port member comprises at least one spring extending between said actuator member and said port member.

4. A pump as recited in claim 3, wherein said mechanism interconnecting said actuator member and said port member comprises a plurality of spaced apart springs extending between said actuator member and said port member.

5. A pump as recited in claim 2, wherein said actuator member and said port member rotate about a common axis.

6. A pump as recited in claim 5, wherein said float is connected to said actuator member by an axial shaft, said shaft rotating about said common axis so as to cause rotation of said actuator member.

7. A pump as recited in claim 1, wherein said port member defines first and second fluid passages, said first and second fluid passages being moved into and out of registry with respective motive and exhaust ports when said port member rotates.

8. A pump as recited in claim 7, wherein said motive and exhaust ports are defined in a fixed element, said port member and said surface being juxtaposed in face-to-face contact.

9. A snap-acting valve comprising:

an actuator member movable between a first position and a second position;

a port member defining a first flow passage, said port member being configured to move between an open position that allows flow through said first flow passage and a closed position that prevents flow through said first flow passage; and

a mechanism operatively interconnecting said actuator member and said port member such that said port member snaps over to said open position when said actuator member reaches said first position and said port member snaps over to said closed position when said actuator member reaches said second position.

10. A valve as recited in claim 9, wherein said mechanism interconnecting said actuator member and said port member comprises at least one spring extending between said actuator member and said port member.

11. A valve as recited in claim 10, wherein said mechanism interconnecting said actuator member and said port member comprises a plurality of spaced apart springs extending between said actuator member and said port member.

12. A valve as recited in claim 11, wherein said actuator member and said port member rotate about a common axis.

13. A valve as recited in claim 12, wherein said actuator member is generally cup-shaped, said port member being concentrically positioned in said actuator member.

14. A valve as recited in claim 13, further comprising a bearing element interposing said actuator member and said port member to facilitate relative rotation therebetween.

15. A valve as recited in claim 9, wherein said port member further defines a second flow passage positioned such that flow therethrough is prevented when said port member is in said open position.

16. A valve as recited in claim 15, wherein flow is allowed through said second flow passage when said port member is in said closed position.

17. A valve as recited in claim 9, wherein said port member is configured as a disc-like plate.

18. A valve as recited in claim 17, wherein said port member is juxtaposed in face-to-face contact with a element defining a first flow port.

19. A valve as recited in claim 18, wherein said first flow passage is formed by a groove defined in a surface of said port member.

20. A valve as recited in claim 18, wherein said first flow passage is formed as a hole defined in and extending through said port member.

21. A valve as recited in claim 9, wherein said actuator member rotates between said first position and said second position.

22. A valve as recited in claim 9, wherein said port member rotates between said open position and said closed position.

23. A valve comprising:

an element defining a first flow port;

an actuator member rotatable about an axis of rotation;

a port member defining a first flow passage, said port member rotatable about said axis of rotation to move said first flow passage in and out of registry with said first flow port; and

a mechanism interconnecting said actuator member and said port member such that said port member snaps to a position in registry with said first flow port when said actuator member reaches a first position and said port member snaps to a position out of registry with said first flow port when said actuator member reaches a second position.

24. A valve as set forth in claim 23, further comprising an axial shaft connected to said actuator member, said shaft rotating about said axis of rotation so as to cause rotation of said actuator member.

25. A valve as set forth in claim 24, wherein said axial shaft is connected to a float such that said actuator member will be rotated by rising and falling of said float.

26. A valve as set forth in claim 24, wherein said axial shaft extends through a centerline bore defined in said port member.

27. A valve as set forth in claim 24, wherein said axial shaft extends axially away from said port member.

28. A valve as recited in claim 23, wherein said port member and said element are each constructed of metal, said port member juxtaposed in face-to-face contact with said element.

29. A valve as recited in claim 23, further comprising an axial compression spring urging said port member into face-to-face contact against said element.

30. A valve as recited in claim 23, further comprising a bearing element interposing said actuator member and said port member to facilitate relative rotation therebetween.

31. A valve as recited in claim 30, wherein said port member further defines a second flow passage.

32. A valve as recited in claim 31, wherein said element further defines a second flow port.

33. A valve as recited in claim 32, wherein said second flow passage will be in registry with said second flow port when said first flow passage is out of registry with said first flow port.

34. A valve as recited in claim 23, wherein said actuator member travels between a first predetermined location and a second predetermined location and said mechanism interconnecting said actuator member and said port member functions to cause said port member to snap over when said actuator member reaches said first predetermined location and said second predetermined location.

35. A valve as recited in claim 34, wherein said mechanism interconnecting said actuator member and said port member comprises at least one spring extending between said actuator member and said port member.

36. A valve as recited in claim 35, wherein said mechanism interconnecting said actuator member and said port member comprises a plurality of spaced apart springs extending between said actuator member and said port member.

37. A method of switching between a first port and a second port comprising the steps of:

(a) rotating an actuator member from a first position to a second position;

(b) in response to said actuator member reaching said second position, rotating a port member in a snap over manner to a position that blocks fluid flow into said first port while allowing fluid flow into said second port; and

(c) in response to said actuator member reaching said first position, rotating said port member in a snap over manner to a position that blocks fluid flow into said second port while allowing fluid flow into said first port.