The invention involves a pressure fault device for indicating a threshold pressure or a threshold differential pressure. The present invention provides a cost effective way to determine where a pressure problem has occurred. The device includes a housing having at least one inlet aperture and an ind
The invention involves a pressure fault device for indicating a threshold pressure or a threshold differential pressure. The present invention provides a cost effective way to determine where a pressure problem has occurred. The device includes a housing having at least one inlet aperture and an indicator aperture and having first and second bores in fluid communication respectively with one inlet aperture and the indicator aperture. The device further includes a magnetic piston which is biased in the first bore toward one inlet aperture and moveable a predetermined distance in another direction in the first bore in response to inlet threshold pressure. The device further includes a magnetic responder which is moveable toward the indicator aperture in the second bore in response to movement of the magnetic piston. The device further includes a latching plate in magnetic relationship to the magnetic responder when the piston moves the predetermined distance. An indicator is disposed in the second bore and partially extends through the indicator aperture. At a threshold pressure or differential pressure, the magnetic responder responds to movement of the magnetic piston and latches onto the latching plate, thrusting the indicator partially through the indicator aperture to indicate a threshold has been reached. The configuration of the magnetic piston and the magnetic responder prevents the magnetic responder from being dislodged from the latching plate, even when the threshold is removed and the magnetic piston returns to its initial position. The magnetic responder can be manually reset when the threshold pressure is removed.
대표청구항▼
What is claimed is: 1. A pressure fault device for indicating a threshold pressure, the device comprising: a housing having at least one inlet aperture and an indicator aperture and defining first and second bores in fluid communication respectively with the at least one inlet aperture and the indi
What is claimed is: 1. A pressure fault device for indicating a threshold pressure, the device comprising: a housing having at least one inlet aperture and an indicator aperture and defining first and second bores in fluid communication respectively with the at least one inlet aperture and the indicator aperture; a magnetic piston disposed in the first bore, the magnetic piston being biasingly movable a predetermined distance away from the at least one inlet aperture in response to inlet threshold pressure; a magnetic responder disposed in the second bore and movable toward the indicator aperture in response to movement of the magnetic piston; and a latching plate in magnetically latching relationship to the magnetic responder when the magnetic piston moves the predetermined distance to indicate the threshold pressure has been reached. 2. The pressure fault device of claim 1 wherein the at least one inlet aperture includes two inlet apertures, the apertures being a high pressure port and a low pressure port at respectively each end of the magnetic piston. 3. The pressure fault device of claim 1 further comprising a biasing spring biasing magnetic piston in a direction toward the at least one inlet aperture. 4. The pressure fault device of claim 1 wherein the latching plate includes a hole formed therethrough and in alignment with the indicator aperture. 5. The pressure fault device of claim 1 further comprising an elongated indicator suspended through the indicator aperture, whereby the magnetic responder latches to the latching plate and thrusts indicator partially through indicator aperture. 6. The pressure fault device of claim 1 wherein the magnetic piston has first and second piston ends respectively facing opposing directions along the first bore, the piston ends having opposite magnetic polarity. 7. The pressure fault device of claim 6 wherein the magnetic responder has first and second responder ends respectively facing opposing directions along the second bore, the responder ends having opposite magnetic polarity, the first responder end having opposite magnetic polarity to the magnetic polarity of the first piston end. 8. The pressure fault device of claim 1 further comprising a seal disposed about the magnetic piston. 9. A pressure fault device for indicating an inlet threshold pressure, the device comprising: a housing including an inlet aperture and an indicator aperture formed therethrough, the housing having a first bore in fluid communication with the inlet aperture, the first bore extending from the inlet aperture to a shoulder, the housing having a second bore in fluid communication with the indicator aperture, the second bore extending from the indicator aperture to a second end and being formed adjacent the first bore; a magnetic piston disposed in the first bore, the magnet piston being biased toward the inlet aperture and movable from the inlet aperture in response to inlet threshold pressure a predetermined distance; a magnetic responder disposed in the second bore and movable toward the indicator aperture in response to movement of the magnetic piston; an indicator partially disposed in the second bore of the housing and partially through the indicator aperture; and a latching plate disposed on the housing, the latching plate having a hole formed therethrough and aligned with the indicator aperture, the magnetic follower being in magnetically latching relationship with the latching plate when the piston moves the predetermined distance along the first bore, thrusting the indicator outwardly partially through the indicator aperture. 10. The pressure fault device of claim 9 further comprising a spring disposed at the shoulder of the first bore and biasingly connected to the magnetic piston, allowing inlet pressure to work against the piston. 11. The pressure fault device of claim 9 wherein the first and second bores are substantially parallel to each other. 12. The pressure fault device of claim 9 further comprising a seal disposed about the magnetic piston. 13. A pressure fault device for indicating a threshold differential pressure, the device comprising: a housing including a high pressure port, a low pressure port, and an indicator aperture formed therethrough, the housing defining first and second bores, the first bore having high and low portions respectively in fluid communication with the high and low pressure ports, the second bore being in fluid communication with the indicator aperture and extending to a second bore end; a magnetic piston disposed in the first bore and between the ports, the magnetic piston having first and second piston ends respectively facing the high and low pressure ports, the first and second piston ends having opposite magnetic polarities, the magnetic piston being biased toward the high pressure port in response to substantially zero pressure differential between the ports, the magnetic piston being oppositely movable a predetermined distance toward the low pressure port in response to pressure differential between the ports; a magnetic responder disposed in the second bore adjacent the second end, the magnetic responder having first and second responder ends respectively facing the indicator aperture and the second bore end, the first responder end having opposite magnetic polarity to first piston end, the second responder end having opposite magnetic polarity to the second piston end, the magnetic responder being movable toward the indicator aperture in response to movement of the magnetic piston; and a latching plate in magnetically latching relationship to the magnetic responder when the magnetic piston moves the predetermined distance in response to differential pressure between the ports. 14. The pressure fault device of claim 13 further comprising a spring disposed at the low portion of the first bore and biasingly connected to the magnetic piston, allowing the differential pressure to work against the piston. 15. The pressure fault device of claim 13 further comprising a spring disposed at the high portion of the first bore and biasingly connected to the magnetic piston, allowing the differential pressure to work against the piston. 16. The pressure fault device of claim 13 further comprising a third bore and a second indicator aperture, the third bore being in fluid communication with the second indicator aperture and extending to a third bore end. 17. The pressure fault device of claim 16 further comprising: a second magnetic responder disposed in the third bore, the second magnetic responder having first and second indicator ends respectively facing the second indicator aperture and the third bore end, the first indicator end of the second magnetic responder having the same magnetic polarity to the first piston end, the second indicator end of the second magnetic responder having the same magnetic polarity to the second piston end, the second magnetic responder being movable toward the second indicator aperture in response to movement of the magnetic piston; and a latching member in magnetically latching relationship to the second magnetic responder when the magnetic piston moves the predetermined distance in response to differential pressure between the ports. 18. The pressure fault device of claim 17 wherein the magnetic piston is biased between the high pressure port and low pressure port in response to substantially zero differential pressure between the ports, the magenetic piston being movable a predetermined distance at a respectively opposite direction in response to differential pressure between the ports.
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이 특허에 인용된 특허 (4)
Buchanan Steven O. (Michigan City IN), Diaphragm type differential pressure gauge with overpressure relief protection.
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