Temperature detecting apparatus and thermal type flow meter using the same

A thermal type flow meter for metering an amount of fluid, comprising:

• a duct for defining a main fluid passage through which said fluid flows;
• a support member made of resin and disposed in said main fluid passage, said support member defining a surface in parallel with a flow of said fluid;
• a temperature sensor supported within said support member and disposed in said main fluid passage, for detecting a temperature of said fluid flowing in said main fluid passage;
• a pair of conductive members made of metal and embedded in said support member, said pair of conductive members being electrically connected to said temperature sensor;
• means for forming a bypass passage for separating a part of said fluid from said main fluid passage;
• a fluid flow detecting unit disposed in said bypass passage, said fluid flow detecting unit comprising:
• a heating element for generating heat to be cooled by said fluid flowing in said bypass passage, and
• a temperature compensating element for detecting a temperature of said fluid flowing in said bypass passage to control an amount of heat generated by said heat generating element:
• an electronic circuit supported within said support member, said electronic circuit including an electric element which generates heat when electric current is supplied thereto;
• an extrusion portion formed on said support member so as to extend along said flow of said fluid, said extrusion portion accommodating said temperature sensor and said pair of conductive members;
• wherein one of said conductive members includes a first extending portion extending within said extrusion portion along said flow of said fluid and a second extending portion extending from said first extending portion into said support member.

A thermal type flow meter for metering an amount of fluid, comprising:

• a duct for defining a main fluid passage through which said fluid flows;
• a support member made of resin and disposed in said main fluid passage, said support member defining a surface in parallel with a flow of said fluid, said support member forms a bypass passage for separating a part of said fluid from said main fluid passage;
• a temperature sensor supported within said support member and disposed in said main fluid passage, for detecting a temperature of said main fluid passage;
• a pair of conductive members made of metal and embedded in said support member, said pair of conductive members being electrically connected to said temperature sensor;
• an electronic circuit supported within said support member, said electronic circuit including an electric element which generates heat when electric current is supplied thereto;
• and
• an extrusion portion formed on said support member so as to extend along said flow of said fluid, said extrusion portion accommodating said temperature sensor and said pair of conductive members.