SU1317277A1 - Pneumatic device for measuring linear dimensions - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to increase the sensitivity and speed by changing the operating mode of the ejector. In a pneumatic device for measuring linear dimensions, an inlet nozzle mounted on an elastic. element, and a fixed output nozzle form an ejector. An annular groove 7 is made in front of the outlet nozzle in the housing .1. The controlled part 8 overlaps the output nozzle 6 to some extent and under the action of pressure difference the elastic element 2 moves the inlet nozzle 5 relative to the groove 7. When the air stream from the inlet nozzle 5 enters the groove , jet turbulization occurs and a sharp decrease in the ejector capacity of the ejector, which leads to an increase in the measuring pressure, from which the controlled size is determined. 1 il. SL

Description

113

The invention relates to a measurement technique and can be used to measure linear dimensions.

The purpose of the invention is to increase the sensitivity and speed by abruptly changing the operating mode of the ejector.

The drawing shows a schematic diagram of the device.

A pneumatic device for measuring linear dimensions comprises a hollow body 1, an elastic element 2 dividing the body into two chambers 3 and 4, and cylindrical nozzles 5 and 6.

The elastic element 2 is made in the form of a membrane. Nozzles 5 and 6 are located on the same axis and form an ejector. A smaller diameter nozzle 5 is fixed on the elastic element 2 and moves with it. The nozzle 6 is fixedly mounted on the housing 1 at the outlet thereof. At the junction of the nozzle 6 with the housing 1 there is an annular groove 7, the cross sections of which with planes passing through the axis of the nozzles are parts of an ellipse, so that the groove is opened towards the nozzle five,

The measured parts 8 are fed to the measuring position and set against the nozzle 6,

The chamber 3 serves compressed air, which passes through the nozzles 5 and 6 and flows into the atmosphere through the gap between the nozzle 6 and part 8, If the size of the part 8 is relatively small and, accordingly, a large gap, the measuring pressure P in the chamber 4 is low and under the action the pressure difference between chambers 3 and 4, the elastic element 2 together with the nozzle 5 moves in the direction of the nozzle 6. When

Editor K. Voloshchuk

Compiled by V.Gordeev

Tehred A. Kravchuk Proofreader A.Zimokosov

Order 2412/36 Circulation 677 Subscription

VNII1Sh State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

.Manufacturing and printing company, Uzhgorod, st. Project, 4

72

This cannula 7 turns out to be a spread of trannn jet flowing from the nozzle 5, which leads to maximum air intake from the chamber 4 and

the minimum pressure P, which determines the size of the details 8,

When the size of the part 8 is relatively large, the resilient element and the Nozzle 5 bonded to it are moved away from

the nozzle 6, part of the jet from the nozzle 5 enters the groove 7, air is circulated in the groove area, which causes turbulence in the whole jet and a sharp increase in the measuring pressure.

Thus, the introduction of a groove at the point where the output nozzle connects to the body provides a sharp change in the operation of the ejector and thereby improves the sensitivity and speed of the device.

Claims (1)

Invention Formula A pneumatic device for measuring linear dimensions, comprising a hollow body, an elastic element dividing it into two chambers forming an ejector, coaxial cylindrical nozzles, one of which is fixed to the elastic element, and the other fixedly mounted on the body, increase sensitivity and speed, nozzle fixed an elastic element made of a smaller diameter; a 1ег moving nozzle is installed at the exit of the device and at the point of its connection with the casing is made annular groove, opened in the direction to the nozzle attached to the elastic element.