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High-gain Pneumatic Element

IP.com Disclosure Number: IPCOM000096850D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Khoury, HA: AUTHOR

Abstract

The two bearing plates 10 and 12 are separated by a distance h. The lower plate 10 has a supply orifice 14 formed in it to which air under pressure is applied. Plate 10 also has an output orifice 16 spaced a distance e from the supply orifice.

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High-gain Pneumatic Element

The two bearing plates 10 and 12 are separated by a distance h. The lower plate 10 has a supply orifice 14 formed in it to which air under pressure is applied. Plate 10 also has an output orifice 16 spaced a distance e from the supply orifice.

The drawing also shows the pressure profile for the device for spacings between the bearing plates of h1 and h2. Here, h2 is approximately an order of magnitude greater than h1 and h1 is in the 100 micro inch range. For the smaller spacing h1, the flow is dominated by viscous forces and the pressure decreases steadily from the supply orifice to the outer edge of the plates. for the larger spacing h2, the flow is dominated by inertial forces. For this spacing, the flow velocity accelerates until it becomes supersonic at point a near the supply orifice. It then decelerates for a period and finally accelerates uniformly to the outer edge of the plates. At the depression point a, a shock interaction exists. This point is only a few thousandths of an inch in radial distance from supply orifice 14.

By adjusting the distance e between supply orifice 14 and output orifice 16 so that the output orifice is situated at point a, a device which gives a very large change in output pressure for a small change in spacing between the bearing plates is obtained. With a 0. 01 diameter input orifice 14, a supply pressure of 80 psi, an offset e of 0.025 and a 0. 002 diameter output orifice 14, a gain of approximately...