Transactions of the Society of Instrument and Control Engineers
Online ISSN : 1883-8189
Print ISSN : 0453-4654
ISSN-L : 0453-4654
Studies on a Pneumatic Micrometer with an Ejector Type Nozzle
on Static Characteristics
Yoshio SUZUKI
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JOURNAL FREE ACCESS

1974 Volume 10 Issue 2 Pages 179-186

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Abstract

This paper describes the static characteristics of a pneumatic micrometer with an ejector type nozzle. This type nozzle is a unit which consists of the nozzle, the output port and the supply port set up at a very near position from the nozzzle.
From experimental results, it was found regarding static output characteristics that the ouput flow rates and the output pressures became negative when the nozzle-flapper gaps became large, and regarding transfer characteristics, that the linearity was better than on that of the thickness comparator type pneumatic micrometer with a single nozzle.
A theoretical analysis was presented for the low supply pressure case, assuming that the pressure at the jet impinging part rose because of the momentum change of the jet impinging on the nozzle and the flapper. Then it was evident that a parameter λ0, which related to the pressure at the jet impinging part, explained the character of the ejector type nozzle and equaled approximately 0.36 when the design was done well.
The theoretical results showed a good agreement with the experimental results. The author gave a criterion for the design of an ejector type nozzle. This nozzle will be profitable as a pneumatic sensor, particulary when we need a large output flow rate for low loads, and it has wide applicability.

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