Patent ID: 9605986
Date: 2017-03-28
CPC Classifications: G01F

Claim:
1. A thermal flow meter comprising: a bypass passage through which a measurement target gas received from a main passage flows; an air flow sensing portion which measures a heat amount by performing heat transfer through a heat transfer surface with the measurement target gas flowing through the bypass passage; and a supporting body comprising a first resin material which is integrally formed with the air flow sensing portion such that at least the heat transfer surface is exposed, wherein the supporting body provides a flow path in which the air flow sensing portion is disposed and a processing unit on which a circuit is disposed, the supporting body is fixed to a fixation wall which is integrally formed with the supporting body by a second resin material and forms the bypass passage, and the flow path provided by the supporting body is arranged inside the bypass passage, and a storage portion having a concave portion is formed in the bypass passage to face the fixation wall and made of a third resin material different from the first and second resin materials, and at least a part of an end portion separated from the fixation wall in the flow path provided by the supporting body is contained in the concave portion of the storage portion.