| 摘要 |
<p>PURPOSE:To prevent the aging effect of an output, by attaching a member, which prevents the attachment of contaminated particles in an air flow to a heat sensitive part, at the upstream part of the heat sensitive part. CONSTITUTION:A contamination preventing memver 6 is assembled together with a small Venturi tube 7 so as to form a unitary body. An air path 8 is connected to a bypass 3. At this time, the contamination preventing member 6 is provided in parallel with a hot wire 4 so that the member is located directly over the hot wire. Thus, the attachment of contaminated particle to the hot wire 4 can be avoided, and no deflection of an output due to the turbulence of an air flow is found. Since the attachment of the turbulent particles in the air flow can be prevented, the aging effect of the output due to the attachment of contaminating particles to the hot wire can be prevented.</p> |
