Gas flow sensor

The utility model discloses a gas flow sensor, this gas flow sensor includes: the casing, the inside through -hole that is suitable for gas to pass through that is formed with of casing, first friction subassembly, first friction subassembly is established on the inner wall of through -hole, the vibrating diaphragm subassembly, the vibrating diaphragm subassembly comprises vibrating diaphragm and mount, and the vibrating diaphragm sets up in the through -hole through fixed, when gas flow through hole, the vibration can take place and produce the signal of telecommunication with the inner wall of through -hole was kept away from to first friction subassembly one side surface contact friction for the vibrating diaphragm. According to the utility model discloses a gas flow sensor produces the electric charge through the friction of vibrating diaphragm and first friction subassembly, and through the first friction subassembly output signal of telecommunication, the frequency of this signal of telecommunication is the same with the vibration frequency of vibrating diaphragm under electrostatic induction's effect, and the vibration frequency of vibrating diaphragm can increase the linearity increase that form along with the velocity of flow of gas, so this gas flow sensor can be outside not using reaches the purpose of the tracer gas velocity of flow under the circumstances in the source of supplying power.