| 摘要 |
PROBLEM TO BE SOLVED: To provide an accurate heat resistor type air flowrate measuring device superior in treatment and low in cost. SOLUTION: The heat resistor type air flowrate measuring device is provided with a main air flow path body 20 forming a main air flow path 22 where air flows and a measuring module 52 containing heating resistors 3, 4, etc. inserted in the main air flow path body for measuring air flowrate. The measuring module 52 has a heating resistor and the like inside a sub-air flow path body 10 forming an L-shape sub-air flow path 13 consisting of an inlet opening 11, a vertical path 13a, a horizontal path 13b and an outlet opening 12 opening to the parallel direction to the main flow line. The main air flow path body 20 has an orifice 21 on the periphery of the side wall inside upstream the sub-air flow path body 10. Inside a flux region D forming the air flow 23 expanding from the tip end of the orifice 21 to the parallel direction of the main flow line, both the inlet opening 11 and outlet opening 12 are arranged.
|
