| 摘要 |
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 is provided for a flow channel block, and an auxiliary flow channel is provided in parallel to the main flow channel. On a front portion of the main flow channel, a spacer container having a C-shaped cross section is provided in a depressed manner along an outer circumference surface, and a portion where the spacer container is not provided is configured as the flow channel wall. Out of a branch flow introduction channel and a branch flow collection channel that communicate the main flow channel and the auxiliary flow channel, a branch entrance of the branch flow introduction channel opens in the flow channel wall at a front side of the main flow channel, and a collection exit of the branch flow collection channel opens in the wall surface of the main flow channel at a back side of the main flow channel. The orifice is contained within the main flow channel from the front side and brought into contact with a stopper section, and the orifice is held by the end surface of an orifice supporting spacer inserted into the spacer container from the front side.
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