| 摘要 |
A turbine type flow meter has a four-vaned plastic torpedo-shaped turbine mounted (40) by portions of the plastic turbine within a housing (22) between first and second bearings. The turbine supports a pair of magnets (54) of the Neodymium-Iron-Boron type which rotate with the turbine. An upstream portion of the housing incorporates a sensor cavity (26), which is sealed from a flow cavity containing the turbine. A connector and an attached printed circuit board (64) with a Hall effect sensor (66) is mounted within the sensor cavity closely spaced from the rotating magnets. The sensor housing is constructed from two parts (24, 28). Each part of the housing incorporates mating structures that are designed for joining by spin welding. <IMAGE>
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