| 摘要 |
<p>This invention provides a flow measuring device of a bypass structure that uses an orifice holding member to hold an orifice, the flow measuring device reducing a change of a flow ratio due to such as a production tolerance of the orifice holding member. A main flow channel (53) is provided for a flow channel block (52), and an auxiliary flow channel (56) is provided in parallel to the main flow channel (53). On a front portion of the main flow channel (53), a spacer container (74) having a C-shaped cross section is provided in a depressed manner along an outer circumference surface, and a portion where the spacer container (74) is not provided is configured as the flow channel wall (54). Out of a branch flow introduction channel (72) and a branch flow collection channel (73) that communicate the main flow channel (53) and the auxiliary flow channel (56), a branch entrance (72a) of the branch flow introduction channel (72) opens in the flow channel wall (54) at a front side of the main flow channel (53), and a collection exit (73a) of the branch flow collection channel (73) opens in the wall surface of the main flow channel (53) at a back side of the main flow channel (53). The orifice (63) is contained within the main flow channel (53) from the front side and brought into contact with a stopper section (75), and the orifice (63) is held by the end surface of an orifice supporting spacer (65) inserted into the spacer container (74) from the front side.</p> |
