Flowmeter having a vibrator therein

A flowmeter adapted for a structure, comprising:

• a main flow passage through which a fluid to be measured flows;
• a throttle mechanism disposed in said main flow passage;
• and a bypass for communicating the upstream and downstream sides of said throttle mechanism with each other,
• said flowmeter being disposed in said bypass and having a measuring section for measuring the differential pressure across said throttle mechanism, to thereby measure the flow rate of the fluid,
• said measuring section including a measuring unit into which the fluid upstream of said throttle mechanism is introduced for measuring the flow rate of the fluid,
• wherein said measuring unit comprises:
• a vibrator positioned in the fluid flowing into said measuring unit and being able to reciprocally vibrate in a direction of width of said flow passage when there occurs a differential pressure due to a flow velocity,
• a flow separator disposed downstream of said vibrator to abut with said vibrator for holding said vibrator in said measuring unit and also separating the fluid, and forming a frequency converter capable of supplying the differential pressure generated by a throttle in said main flow passage to said vibrator from the upstream side so that said vibrator can reciprocally vibrate,
• a vibrator abutting portion disposed upstream of said vibrator and coming into abutment with said vibrator when said vibrator is vibrated, and
• a frequency detector capable of detecting reciprocal frequency of said vibrator,
• said flow separator having a first surface and a second surface opposite said first surface and being disposed to divide the interior of said measuring unit for defining a pair of cavities side by side in the direction of width of said flow passage, wherein one of said pair of cavities is defined within said first surface of said flow separator and an inner surface portion of said measuring unit, wherein another one of said pair of cavities is defined within said second surface of said flow separator and another inner surface portion of said measuring unit, said pair of cavities making up said frequency converter,
• said vibrator being reciprocally vibrated upstream between said pair of cavities in the direction of width of said flow passage, the reciprocal frequency of said vibrator being detected by said frequency detector to detect the flow rate of the fluid.