AIR-INTAKE SHUTOFF VALVES FOR ENGINES

• US 20170298842A1
• Filed: 04/18/2016
• Published: 10/19/2017
• Est. Priority Date: 04/18/2016
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Stabnik, Joseph J., Trimm, Malcolm, Chandler, Lawrence, Quinn, Cormac, Brown, Ryan M., Marshall, Stephen J.
• Granted Patent: US 10,113,491 B2
• Time in Patent Office: Days
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 2075/027 four
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02B 75/021 having six or more strokes per cycle
• CPC Class Codes: F02D 17/04 rendering engines inoperative or idling, e.g. caused by abnormal conditions dependent on lubricating conditions F01M1/22; dependent on cooling F01P5/14
• CPC Class Codes: F02D 2009/0245 Shutting down engine, e.g. working together with fuel cut-off
• CPC Class Codes: F02D 2009/0277 Fail-safe mechanisms, e.g. with limp-home feature, to close throttle if actuator fails, or if control cable sticks or breaks
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 9/14 the members being slidable transversely of conduit
• CPC Class Codes: F16K 17/363 the closure members being rotatable or pivoting F16K17/386 takes precedence
• CPC Class Codes: F16K 3/0254 being operated by particular means
• CPC Class Codes: F16K 3/0281 Guillotine or blade-type valves, e.g. no passage through the valve member
• CPC Class Codes: F16K 3/06 in the form of closure plates arranged between supply and discharge passages F16K3/10 takes precedence

Abstract

An actuation system for a valve is disclosed. The actuation system comprises a housing having an end wall. A first piston and a second piston is slidably positioned within the housing. The second piston is positioned between the first piston and the end wall. A piston rod is coupled to the first piston and slidably extends through the second piston and the end wall. The piston rod is configured to be coupled with the valve. A first spring is arranged between the first piston and the second piston. Further, a second spring is arranged between the second piston and the end wall. The first spring and the second spring are configured to bias the valve to a closed position.

Claims

1. An actuation system for a valve, comprising:

a housing having an end wall;

a first piston slidably positioned within the housing;

a second piston slidably positioned within the housing, between the first piston and the end wall;

a piston rod coupled to the first piston and slidably extending through the second piston and the end wall, and configured to be coupled with the valve;

a first spring arranged between the first piston and the second piston; and

a second spring arranged between the second piston and the end wall, wherein the first spring and the second spring are configured to bias the valve to a closed position.

2. The actuation system of claim 1, wherein the valve is a swing gate valve.

3. The actuation system of claim 1, wherein a spacer is arranged between the first piston and the second piston to limit a compression of the first spring to a predetermined length.

4. The actuation system of claim 1, wherein the first spring includes a different spring force than the second spring.

5. The actuation system of claim 1, wherein the in the closed position, both the first spring and the second spring are retracted, with the second spring attaining a maximum expanded length, and the first spring urging the valve to the closed position.

6. The actuation system of claim 1, wherein the valve includes a position sensor to determine the closed position of the valve.

7. The actuation system of claim 6, wherein in the closed position the first spring and the second spring bias the valve to the closed position such that the first piston is compressed against the position sensor.

8. The actuation system of claim 6, wherein the position sensor is a proximity switch.

9. The actuation system of claim 1, wherein the valve includes at least one of a solenoid-operated latch assembly, a pneumatic-operated latch assembly, and a hydraulic-operated latch assembly, to retain the valve in the open position.

10. An actuation system for a valve, comprising:

a housing with an end wall;

a first piston slidably positioned within the housing;

a piston rod coupled to the first piston and slidably extending through the end wall, and configured to be coupled with the valve;

at least one first spring arranged within the housing between the first piston and the end wall;

at least one second spring arranged sequentially with the at least one first spring within the housing between the first piston and the end wall, the at least one first spring including a different spring force relative to a spring force of the at least one second spring;

wherein the at least one first spring is adapted to be compressed to a predetermined length before initiation of a compression of the at least one second spring during an opening of the valve to an open position.

11. The actuation system of claim 10, wherein a spacer is arranged within the housing to limit a compression of the at least one first spring to a predetermined length.

12. The actuation system of claim 10, wherein the in a closed position of the valve, both the at least one first spring and the at least one second spring are retracted, with the at least one second spring attaining a maximum expanded length, and the at least one first spring urging the valve to the closed position.

13. The actuation system of claim 10, wherein the valve includes a position sensor to determine a closed position of the valve.

14. The actuation system of claim 13, wherein in the closed position the at least one first spring and the at least one second spring bias the valve to the closed position such that the first piston is compressed against the position sensor.

15. The actuation system of claim 10, wherein the valve includes at least one of a solenoid-operated latch assembly, a pneumatic-operated latch assembly, and a hydraulic-operated latch assembly, to retain the valve in the open position.

16. An air-intake shutoff valve for an engine, the air-intake shutoff valve comprising:

a gate configured to control airflow to the engine;

an actuation system to operate the gate, the actuation system including;

a housing having an end wall;

a first piston slidably positioned within the housing,

a second piston slidably positioned within the housing, between the first piston and the end wall;

a piston rod coupled to the first piston and slidably extending through the second piston and the end wall, and configured to be coupled with the air-intake shutoff valve;

a first spring arranged between the first piston and the second piston; and

a second spring arranged between the second piston and the end wall,

wherein the first spring and the second spring are configured to bias the air-intake shutoff valve to a closed position.

17. The air-intake shutoff valve of claim 16, wherein a spacer is arranged between the first piston and the second piston to limit a compression of the first spring to a predetermined length.

18. The air-intake shutoff valve of claim 16, wherein the first spring includes a different spring force than the second spring.

19. The air-intake shutoff valve of claim 16, wherein the in the closed position, both the first spring and the second spring are retracted, with the second spring attaining a maximum expanded length, and the first spring urging the gate to the closed position.

20. The air-intake shutoff valve of claim 16 further comprising a position sensor, wherein the first spring and the second spring bias the air-intake shutoff valve to the closed position such that the first piston is compressed against the position sensor.