| 摘要 |
<p>PURPOSE:To improve accuracy and productivity of a measuring device by a method wherein a venturi part, a bypass passage and a driving circuit housing part of exothermic resisting body are formed into a unified structure with synthetic resin and a pair of heat resisting bodies are arranged in parallel in a bypass passage. CONSTITUTION:A frame body 10 including a venturi part 9, a bypass passage 3 and a housing part of a driving circuit 7 of an exothermic resisting body 5 is formed into a one body with synthetic resin and in a bypass passage 3, a pair of exothermic resisting bodies 5 is arranged in shunt at a right angle to an air flow. In this way, since the frame body 10 is a synthetic resin plastic product, mass production is possible. And further, since heat conductivity thereof is low, a heat effect from an internal combustion engine is scarce. And further, since exothermic resisting bodies 5a, 5b are arranged in shunt in the bypass passage 3, a heat interference is not produced. And further, the outlet of the bypass passage is made annular, as a result, an averaged negative pressure is actuated in the bypass passage 3, thus, improving a measurement accuracy. And still, the exothermic resisting body receives no influence of flame and explosion wind during a generation of backfire.</p> |
