| 摘要 |
Flow transducer for respiration which comprises a pressure generator 1, connected by a conduit provided with a small-section orifice 2 located in the centre of the pneumatic tachograph 10 and with its exit control shaft for the flow 3 coinciding with the longitudinal axis of the pneumatic tachograph, the flow 3, on leaving the orifice 2, being made to disperse along the section 4 of the inside of the pneumatic tachograph, giving rise to a resistance to the flow to be measured 5 which circulates in a direction counter to the exit of the flow 3, the measured pressure difference being, between the conduits 6 and 7, proportional to the flow 5, the resistance created thereby being made to have a linear response to flows between 0 and 3 litres per second, the measurement of the flow being given by the difference in pressure in the extremes 6 and 7 of this resistance. <IMAGE>
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