Abstract: A magnet pump includes a synthetic resin casing, divided into a front casing and a rear casing and configured to internally form an impeller housing chamber and a magnet can housing chamber contiguous thereto, having an inlet and an outlet for a target fluid to be transferred. The casing forms an eddy chamber at a position for dividing the front casing and the rear casing along the outer rim of the impeller housing chamber to surround the outer rim of the impeller. The eddy chamber has overhangs formed at an entry of the eddy chamber hanging over from both sides in the rotational-axis direction of the impeller.

Abstract: A magnet pump comprises a synthetic resin casing (1), divided into a front casing (2) and a rear casing (3) and configured to internally form an impeller housing chamber (4) and a magnet can housing chamber (5) contiguous thereto, having an inlet and an outlet for a target fluid to be transferred. The magnet can housing chamber (5) in the casing (1) houses a substantially cylindrical magnet can (11) with a follower magnet (14) mounted on the outer rim thereof. The magnet can (11) is rotatably supported by a spindle (8). A disk-like impeller (21) is fixed at the front end of the magnet can (11), having a flow path formed inside to suck the target fluid from the center, transfer the target fluid outward in the radial direction, and discharge the target fluid from the outer rim. The impeller (21) is housed in the impeller housing chamber (4).

Abstract: A filter includes a case, filtering material housed within the case, a cover which covers the open end of the case and is non-rotatable relative to the case, and an annular fastener clamping the cover to the case. The case includes a large-diameter portion at an open end of the case, the large-diameter portion including a convexity forming an engagement tab. The cover has a concavity into which the convexity is received to prevent the cover from rotating relative to the case. Moreover, the cover includes a screw thread on the outer periphery thereof. The annular fastener has a screw thread on the inner periphery thereof mated with the screw thread on the outer periphery of the cover. On the other hand, the annular fastener has a small-diameter portion engaged with the large-diameter portion of the case by which engagement and mating of the screw threads the annular fastener secures the cover to the case.