Fluid pressure detector
A pressure detector includes a body delimiting two chambers which are connected to each other by a channel and are each intended to be connected to a source of pressurized fluid, a mobile unit fixed to one end of a rod mounted slidably in the channel and defining with said channel an escape path between the two chambers, and a detector of at least one position of the mobile unit signifying a determined threshold of a pressure difference between the two chambers, the mobile unit being subjected to the action of an elastic element returning said mobile unit towards the channel.
1 . A pressure detector comprising a body delimiting a chamber, wherein two channels open into, arranged to each be connected to a source of pressurized fluid, a mobile unit extending inside the chamber and fixed to a rod mounted slidably in one of the channels, by defining with it an escape passage for the fluid, and a detector of at least one position of the mobile unit signifying a determined threshold of pressure difference between the two sources of fluids, the mobile unit being subjected to the action of an elastic element returning said mobile unit towards the channel wherein the rod slides, and the rod being equipped, at an end opposite that receiving the mobile unit, with an abutment arranged to limit the sliding of the rod towards the chamber.
2 . The pressure detector according to claim 1 , wherein the abutment is equipped with a seal arranged to block the escape passage when the abutment is in contact with the body.
3 . The pressure detector according to claim 1 , wherein, in response to the detection of the position of the mobile unit, the position detector emits a signal of the logic type, being able to take two distinctive values.
4 . The pressure detector according to claim 1 , wherein the position detector comprises a permanent magnet carried by the mobile unit and an inductive cell sensitive to the magnetic field of the permanent magnet fixedly carried by the body facing the permanent magnet.
5 . The pressure detector according to claim 4 , wherein the position detector further comprises a counter-magnet fixedly mounted on the body opposite the permanent magnet of the mobile unit with respect to the inductive cell.
6 . The pressure detector according to claim 1 , wherein the elastic element is a helical spring.
7 . A hydraulic actuation system comprising at least one pressure detector according to claim 1 .
8 . A method for detecting a crossing of a pressure different threshold between two sources of pressurized fluid, the method implementing a pressure detector according to claim 1 and comprising:
connecting each of the two channels of the pressure detector to one of the two sources of fluid; and
deducing, based on detection of the at least one position of the mobile unit by the pressure detector, the crossing of the pressure different threshold between the two sources of fluid.