Patent ID: 9733113
Date: 2017-08-15
CPC Classifications: F02D,G01F

Claim:
1. A thermal flow meter comprising: a bypass passage into which a measurement target gas flowing through a main passage flows; a circuit package which includes an air flow sensing portion for measuring a flow rate by performing heat transfer with the measurement target gas flowing through the bypass passage, a processing unit for controlling the air flow sensing portion, and a temperature detecting portion including a temperature detection element for detecting a temperature of the measurement target gas; and a case which includes an external terminal for outputting an electric signal representing the flow rate and an electric signal representing a temperature of the measurement target gas and supports the circuit package, wherein the case includes a resin housing which supports the circuit package, the circuit package includes a circuit package body that is molded by a resin and the circuit package is configured to envelope the processing unit and the temperature detecting portion with the resin, the circuit package includes a protrusion protruding in a shape extending to an upstream direction of the measurement target gas from a side of the circuit package body, and the temperature detection element is buried in the protrusion, and at least a leading end portion of the protrusion is exposed in the main passage.