FR2641087A1 - Detector for the capture of magnetically capturable and/or electrically conducting particles - Google Patents

Abstract

Device for improving detection information on capture of metal particles flowing through lubrication and/or hydraulic and/or thermal conditioning circuits. It consists of a magnetic field 3 generated by a permanent magnet 2 immersed in a fluid 1, two electrically conducting contact points 4 and 5b being installed at the ends of the magnet, one 4 being monobloc and the other being multiply partitioned. When particles are captured by the magnetic field, they form one or more bridges, depending on the quantity, between the opposite contact points 4 and 5b, thus allowing the creation of one or more electrical paths. The device according to the invention is in particular intended for monitoring the production of particles when it is desired to reduce uncertainty.

Description

 The present invention relates to a device for ensuring a more reliable detection of magnetizable and electrically conductive metal particles in circulation in lubricating fluids and / or hydraulic and / or thermal conditioning.

 This detection is traditionally performed by a magnetic field (3) which, being immersed in the fluid (1) of said circuits, ensures the capture of the particles to be detected where the magnetic field is the most intense.

 Although the magnetic field can be generated by an electric winding, the economic means generally employed is a permanent magnet (2).

 At the ends of the submerged magnetic field are two conductive pads (4 and 5) in metallic form providing electrical continuity when enough particle (s) is or are accumulated (s) to ensure electrical bridging. By this conventional means, it is easy to obtain detection information by any system using an electrical signal. However, even if there is a simple possibility of raising doubts about this detection information by discharging a capacitive current between the ends of the bridging in an attempt to destroy by the Joule effect the accumulated particle (s), this is not sufficient in the case where particles of no consequence can appear and lead to costly safety and / or maintenance operations.

 The present invention makes it possible to increase the reliability of the detection information by multiplying the bridging by splitting it on one of the ends only (5b). On the same magnetic field, there are several possible bridging, in the xenre encorbrepent, which allows better information monitoring the evolution of particle production.

 The device can use a magnetic field resulting from the addition of several fields of different origins.

 Particle capture can be carried out using a filtrelorepine, with or without magnetic fields).

 The conductive pads may be constituted by the cells of a filter (an alternating conducting strand with a non-conducting strand).

 The electrical conductor strands can also be the propagators of the magnetic field lines (quality of the material) because connecting two opposite poles.

 These drawings have no scale, the nvention being applicable in all cases regardless of the size of the circuits and particles to be detected.

 This device is particularly applicable when a doubt is necessary for maintenance interventions are spaced over time.

Figure 1 shows in section the conventional assembly.

Figure 2 shows in section the assembly according to the invention.

 1- Fluid in motion.

 2- Have permanent.

 3- Magnetic field of the permanent magnet.

4- First monoblock contact pad.

 5a- Second one-piece contact pad.

5b- Second fragmented contact pad.

6- Electrical cables carrying the signal.

Claims (5)

1) Device immersed in a fluid (1) of lubrication and / or hydraulic and / or thermal conditioning, multipontable on the same magnetic field (3) having a common pad (4) facing several others (5b), allowing closing a plurality of electrical circuits by accumulating magnetizable and electrically conductive metal particles between said pads, in line with said magnetic field, in order to obtain one (or more) resulting signaling (s) to indicate a detection of presence of particles in the fluid concerned. 2) Device according to revendcation 1) but can use a general magnetic field resulting from the addition of several fields of different origins. 3) Device according to claim 1) but the capture of the particles being effected with a filter -repine with or without aagnetic fields (s) coe capture vector. 4) Device according to claim 1> but the conductive pads are constituted by the cells of a filter (an alternating conducting strand with a non-conductive strand). 5) Device according to claim 4) but the electrically conductive strands are also the propagators of the lines of the magnetic field (quality of the material) because connecting two opposite poles.