| 摘要 |
<p>A tube switch for a double-cylinder sludge pump is provided including a swing pipe (202), a wearing ring (204) and an elastic member (206). The swing pipe (202) is adapted to swivel in front of a center plate (5) and includes an extension portion (212) having an inner surface (214). The wearing ring (204) is supported between the end of the swing pipe (202) and the center plate (5) and is axially movable relative to the swing pipe (202). The wearing ring (204) has a recess (208) formed at one end thereof, defined by a sloped boundary surface. The swing pipe (202) is adapted to receive the end of the wearing ring (204) including the recess (208) therein. The recess (208) thus defines an annular space (228) between the swing pipe (202) and the wearing ring (204) with the inner surface (214) of the extension portion (212) of the swing pipe (202) facing the annular space (228). The elastic member (206) includes a radial inner surface (236) and a sloped front end suface (232) that corresponds to and abuts the boundary surface (222) of the wearing ring (204). The elastic member (206) is supported between the swing pipe (202) and the wearing ring (204) within the annular space (228). The inner surface (214) of the extension portion (212) of the swing pipe (202) is ridgeless such that generally no portion of the swing pipe (202) contacts the radial inner portion (236) of the elastic member (206).</p> |
