Measuring and testing – Sampler – sample handling – etc. – Automatic control
Patent
1990-09-28
1992-02-25
Raevis, Robert
Measuring and testing
Sampler, sample handling, etc.
Automatic control
G01N 100
Patent
active
050902580
ABSTRACT:
A multipipe flow-dividing dilution tunnel system divides a gas to be inspected, such as an automobile exhaust gas, at a predetermined division ratio, dilutes a divided gas with a dilution gas, and samples and tests the diluted gas for particulate materials and other constituents. The gas to be inspected is introduced into a multipipe flow divider having a plurality of flow-dividing pipes, one of which extends as an inlet pipe into a dilution tunnel. The gas is divided by the inlet pipe and introduced therethrough into the dilution tunnel. A plurality of division ratio control nozzles are disposed in the dilution tunnel immediately downstream of the outlet of the inlet pipe for ejecting for ejecting a pressurized dilution gas toward a position downstream of the outlet of the inlet pipe. The ejected dilution gas gives, to the inlet pipe, a pressure loss equal to fluctuations of the pressure loss caused by the multipipe flow divider, so that a static pressure at the outlet of the inlet pipe and a static pressure at the outlet of the flow divider will be equalized. The ratio of the rate of the divided gas introduced through the inlet pipe into the dilution tunnel to the rate of the total gas introduced into the system is thus rendered constant at all times. Irrespective of fluctuations of the rate of the total gas introduced into the system, the gas can always be divided at a constant division ratio for accurate examination of its components or constituents.
REFERENCES:
patent: 3478600 (1969-11-01), Lynn
patent: 4586367 (1986-05-01), Lewis
patent: 4633706 (1987-01-01), Ito et al.
Abe Souhei
Fukano Izumi
Takeda Yoshinaka
Yamasaki Akira
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Raevis Robert
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