Impending bypass indicator

Inventor: Issam Al-Khairy (Verdun, CA)

Assignee: PRATT & WHITNEY CANADA CORP.

B01D46/0086 B01D46/0087

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Quick Facts

Patent No.: US 12702945
App. No.: 18/967,959
Granted: Aug 11, 2026
Kind: B2

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Abstract

An impending bypass indicator (IBI) includes a housing having a fluid inlet for admitting a fluid into an interior of the housing, and a piston displaceable in the interior of the housing in response to a pressure variation of the fluid in the interior, the piston displaceable between a first position and a second position spaced apart from the first position. A piston magnet is coupled to the piston. An indicator indicates an impending bypass of a component in response to the piston being in the second position. A housing magnet engages the piston magnet in the second position and generates a magnetic force acting on the piston magnet. A biasing element biases the piston towards the first position with a biasing force inferior to the magnetic force. An electromagnetic coil adjacent the housing magnet is selectively electrifiable to generate a second magnetic force opposite to the magnetic force.

Claims (33)

1 . An impending bypass indicator (IBI), comprising:

a housing having a fluid inlet for admitting a fluid into an interior of the housing;

a piston displaceable in the interior of the housing in response to a pressure variation of the fluid in the interior, the piston displaceable between a first position and a second position spaced apart from the first position, a piston magnet coupled to the piston;

an indicator indicating an impending bypass of a component in response to the piston being in the second position;

a housing magnet in the housing, the housing magnet engaging the piston magnet in the second position of the piston, the housing magnet generating a magnetic force acting on the piston magnet;

a biasing element biasing the piston towards the first position with a biasing force inferior to the magnetic force; and

an electromagnetic coil disposed adjacent the housing magnet, the electromagnetic coil selectively electrifiable to generate a second magnetic force opposite to the magnetic force imparted by the housing magnet to allow the biasing element to bias the piston towards the first position.

2 . The IBI as defined in claim 1 , further comprising an additional housing magnet in the housing, the additional housing magnet engaging the piston magnet in the first position of the piston, the additional housing magnet generating an additional magnetic force acting on the piston magnet to retain the piston in the first position until the pressure variation of the fluid in the interior increases to a magnitude indicative of the impending bypass of the component.

3 . The IBI as defined in claim 1 , further comprising a magnetic sensor configured to receive a current and fixedly mounted to the housing, and an indicator magnet mounted to the piston to be displaced with the piston, displacement of the indicator magnet relative to the magnetic sensor causing a change in the current through the magnetic sensor, the change in the current indicative of the impending bypass of the component.

4 . The IBI as defined in claim 3 , wherein the magnetic sensor is a Hall effect sensor.

5 . The IBI as defined in claim 3 , wherein the magnetic sensor is a magnetoresistive sensor.

6 . The IBI as defined in claim 1 , wherein the housing further includes a fluid outlet for evacuating the fluid from the interior of the housing to bypass the component.

7 . The IBI as defined in claim 1 , further comprising a visual indicator including a display through the housing and a visual indication coupled to and displaceable with the piston, the visual indication positioned in the display upon the piston displacing to the second position to visually indicate the impending bypass of the component.

8 . The IBI as defined in claim 1 , wherein the housing includes a diaphragm fluidly sealing a wet portion of the interior from a dry portion, the diaphragm engaging the piston to displace the piston in response to the pressure variation of the fluid.

9 . The IBI as defined in claim 1 , wherein the biasing element is a spring and the biasing force is a spring force biasing the piston towards the first position.

10 . A fluid filter system, comprising:

a fluid line for conveying a fluid under pressure to a fluid filter;

an impending bypass indicator (IBI), comprising:

a housing having a fluid inlet for admitting a fluid into an interior of the housing;

an indicator indicating an impending bypass of the fluid filter in response to the piston being in the second position;

a housing magnet in the housing, the housing magnet engaging the piston magnet in the second position of the piston, the housing magnet generating a magnetic force acting on the piston magnet;

a biasing element biasing the piston towards the first position with a biasing force inferior to the magnetic force; and

11 . The fluid filter system as defined in claim 10 , further comprising an additional housing magnet in the housing, the additional housing magnet engaging the piston magnet in the first position of the piston, the additional housing magnet generating an additional magnetic force acting on the piston magnet to retain the piston in the first position until the pressure variation of the fluid in the interior increases to a magnitude indicative of the impending bypass of the fluid filter.

12 . The fluid filter system as defined in claim 10 , wherein the indicator includes a magnetic sensor configured to receive a current and fixedly mounted to the housing, and an indicator magnet mounted to the piston to be displaced with the piston, displacement of the indicator magnet relative to the magnetic sensor causing a change in the current through the magnetic sensor, the change in the current indicative of the impending bypass of the fluid filter.

13 . The fluid filter system as defined in claim 12 , wherein the magnetic sensor is a Hall effect sensor.

14 . The fluid filter system as defined in claim 12 , wherein the magnetic sensor is a magnetoresistive sensor.

15 . The fluid filter system as defined in claim 10 , wherein the housing further includes a fluid outlet for evacuating the fluid from the interior of the housing to bypass the fluid filter.

16 . The fluid filter system as defined in claim 10 , wherein the indicator includes a visual indicator including a display through the housing and a visual indication coupled to and displaceable with the piston, the visual indication positioned in the display upon the piston displacing to the second position to visually indicate the impending bypass of the fluid filter.

17 . The fluid filter system as defined in claim 10 , wherein the housing includes a diaphragm fluidly sealing a wet portion of the interior from a dry portion, the diaphragm engaging the piston to displace the piston in response to the pressure variation of the fluid.

18 . The fluid filter system as defined in claim 10 , wherein the biasing element is a spring and the biasing force is a spring force biasing the piston towards the first position.

19 . The fluid filter system as defined in claim 10 , further comprising a bypass line in the fluid line, the bypass line including a valve, the valve actuated upon receipt of a bypass signal from the IBI indicative of the impending bypass of the fluid filter to create a bypass of the fluid filter in the fluid line.