Heating resistor type flow measuring device

摘要

The invention relates to a heating resistor type flow measuring device comprising a housing (50) having a support part (3) provided between a frame body (4) and a connector (2) and connected to the mounting part (15A) of a fluid passage (15), a flow rate detection element held on the frame body side of the housing (50), and an electronic circuit (6) held on the housing (50) and connected electrically to the flow rate detection element and the connector (2), wherein the electronic circuit (6) is held on the frame body side of the housing (50) and positioned in the fluid passage (15), a member with the rigidity higher than the material of the main structural member of the housing (50) is formed integrally with the support part (3), the housing (50) is fixed to the fluid passage (15) through the member with high rigidity. A metal plate (22) is inserted into the support part (3) so as to increase rigidity. Further, a distance is provided between the support part (3) and a metal plate (22) forming a route for conducting the heat transferred to the metal base (5) fixing an electronic circuit substrate by a plastic mold so as to form a structure obstructing a heat transfer, or a clearance is provided in a portion spaced by the plastic mold between the support part (3) and the metal base (5) so as to form a structure obstructing a heat transfer.