Patent ID: 9475062
Filing Date: 2016-10-25
CPC Classification: B03C,B24B,C02F

Claim Text:
1. A magnetic inline filter, comprising: a double pipe composed of an inner pipe and an outer pipe disposed coaxially with each other, the double pipe being a cylindrical body for draining waste water including foreign matters, which are magnetic bodies, to a space, which is a gap between the inner pipe and the outer pipe; an inner circumferential surface side magnet, disposed on an inner circumferential surface side of the inner pipe; an external circumferential surface side magnet, disposed on an outer circumferential surface side of the outer pipe; and a relative driving device, which is driving device for moving the inner circumferential surface side magnet and the outer circumferential surface side magnet in the axial direction to keep the inner circumferential surface side magnet and the outer circumferential surface side magnet away from the space so that the foreign matters, which are retained and magnetized in the space and on circumferential surfaces of the inner pipe and the outer pipe, are demagnetized and discharged to an outside of the space, wherein the inner circumferential surface side magnet and the outer circumferential surface side magnet are disposed to be opposed to each other at different polarities, an axial direction length of the inner pipe is formed at least twice as long as an axial direction length of the outer pipe, in the inner circumferential surface side magnet and the outer circumferential surface side magnet, a plurality of magnets are stacked in the axial direction and disposed along an axial direction length substantially the same as an axial direction length of the outer pipe, in the inner circumferential surface side magnet, the plurality of magnets are disposed at equal angle intervals over an entire circumference of an inner circumferential surface of the inner pipe, and in the outer circumferential surface side magnet, the plurality of magnets are disposed at equal angle intervals over an entire circumference of an outer circumferential surface of the outer pipe, and the relative driving device includes: a first guide rod that guides the movement of the inner circumferential surface side magnet in the axial direction; a second guide rod that guides the movement of the outer circumferential surface side magnet in the axial direction; and a coupling plate for coupling the inner circumferential surface side magnet and the outer circumferential surface side magnet and driving the inner circumferential surface side magnet and the outer circumferential surface side magnet in synchronization with each other.