Flow rate measuring apparatus

An apparatus for measuring a flow rate of a fluid, comprising:

• a main body;
• a flow channel disposed within said main body for receiving a fluid flow therethrough;
• a cantilever-type pressure receiving plate made of a resilent member, wherein one end portion of said pressure receiving plate is inserted within said flow channel to receive a force applied by a flow of said fluid at one surface of said one end portion, and wherein another end portion of said pressure receiving plate is supported on said main body;
• a wall defining a cross-sectional area for said fluid flow together with a leading end of said one end portion at a postion opposing said leading end, said wall having a shape such that said cross-sectional area for said fluid flow at said position is increased as said pressure receiving plate is deflected by said force;
• a first detector for detecting a first deflection of said one end portion of said pressure receiving plate, received in a hollow portion disposed within said main body and in communication with said flow channel;
• a cantilever-type gravity detection plate made of a resilient member and received in said hollow portion, wherein one end portion of said gravity detection plate is a free end supported within said main body;
• a second detector for detecting a second deflection of said one end portion of said gravity detection plate due to gravity;
• and
• a comparator for comparing said first deflection with said second deflection and for compensating said first deflection of said pressure receiving plate due to gravity.