Patent EA-000443-B1 (EA)
Title: A device for deionizing the gases notably the breaking gases in an arc extinguisning chamber of a low voltage molded case circuit breaker
Inventor: RIVAL MARC
IPC: H01H9/34
Filed: 1997-06-27
Abstract: 1. A gas deionization device, comprising a porous shield designed notably to be arranged near to the outlet orifice of the arc extinguishing chamber of a low voltage circuit breaker to perform cooling of the breaking gases generated when separation of the contacts takes place after the circuit breaker has tripped, said porous shield is a cloth called reps (T) comprising a crossed texture of straight wire yarns (15) spaced apart from and parallel to one another with tight joined undulated wire yarns (16), characterized in that said undulated wire yarns (16) extending appreciably perpendicularly to said straight wire yarns (15) and passing alternately over and under at least one of the successive straight wire yarns (15). 2. The device according to Claim 1, characterized in that the above-mentioned cloth(s) (T) is (ar) made of a corrosion-resistant metallic material such as stainless steel or nickel. 3. The device according to Claim 1 or 2, characterized in that each cloth (T) comprises meshes M of appreciably triangular shape designed for passage of the gas and each defined by a straight wire yarn (15) and two undulated wire yams (16) tangent to one another in the mid-plane p of the cloth (T). 4. The device according to any one of the foregoing Claims, characterized in that at least one of the above-mentioned cloths (T) comprises undulated wire yarns (16) passing alternately over and under a single straight wire yarn (15) at a time, and arranged two by two so that when one passes over a straight wire yarn (15), the other one passes under this same straight wire yarn (15). 5. The device according to any one of the foregoing Claims, characterized in that at least one of the above-mentioned cloths (T) comprises undulated wire yarns (16) passing alternately under and over two straight wire yarns (15) at a time, each time with an offset of a straight wire yarn (15) with respect to the previous undulated wire yarn (16), the undulated wire yarns (16) being imbricated. 6. The device according to any one of the foregoing Claims, characterized in that the undulated wire yarns (16) are the weft yarns. 7. The device according to any one of the foregoing Claims, characterized in that the diameter of the undulated wire yarns (16) is smaller than that of the straight wire yarns (15). 8. The device according to any one of the foregoing Claims, characterized in that it comprises at least two superposed cloths (T) having mesh openings of different size. 9. The device according to any one of the foregoing Claims, characterized in that it comprises at least three superposed cloths (T) having progressive mesh openings, the cloth (T) presenting the largest mesh openings, called the first cloth, being passed through first by the gases. 10. The device according to any one of the foregoing Claim, characterized in that a diameter of undulated yarns (16) and straight yarns (15) greater than 0.5 mm and a nominal opening greater than 400 mkm, whereas the last cloth presents a nominal opening smaller than 200 mkm.