DIRT FILTER FOR LIQUID THERMOPLASTIC MATERIALS

摘要

1. Dirt filter for viscously fluid thermoplastic media with a filter space (13), formed in an openable housing (1, 2, 3), in which a blocking body (15; 75) is seated, with a feed line (11), formed in the housing, which opens into the filter space (13), with a discharge line (12) formed in the housing, which leads out of the filter space on the side of the blocking body opposite to the mouth of the feed line, with an annular gap (34) between a peripheral region of the blocking body coaxial to a flow axis and the oppositely lying inner wall of the filter space, which gap is part of the flow connection between feed line and discharge line, in which the blocking body is adjustable from a filter position into a cleaning position, in which the annular gap is a blocking gap in the filter position of the blocking body which is so narrow that the dirt components to be retained cannot pass, in which the annular gap is a cleaning gap in the cleaning position of the blocking body, which is wider than the blocking gap, so that the dirt particles retained by the blocking gap can pass, and with an adjusting member (32) accessible from the outside for adjusting the blocking body out of its filter position into its cleaning position and back, characterized in that the blocking body (15; 75) is displaceable along the flow axis (14, 74) from its filter position into its cleaning position and conversely, and in that there is formed on the end of the blocking body facing the feed line a guide body (27; 87) which has an annular, to the flow axis (14, 74) and outwardly projecting from the flow axis rim which mates in a guide recess (28, 29, 88, 89) of the housing and is displaceable in the direction of the flow axis, in that distributed channels (18-21, 78-81) for the through flow of the thermoplastic medium are formed in the rim of the guide body distributed round the periphery, with a through width greater than that of the blocking gap, and in that the adjusting member (41, 101) is coupled by force engagement on the periphery of the rim.