SU397918A1 - PNEUMATIC COMPUTING DEVICE - Google Patents

Description

one

This invention relates to the field of automatic control. The device can be used in pneumatic systems.

A pneumatic computing device is known which contains a pressure-to-flow transducer, a flow-to-pressure transducer.

The purpose of the invention is to increase accuracy.

The proposed pneumatic computing device is characterized in that the output channel of the pressure-to-flow transducer is connected to the flow-to-pressure transducer via a flow follower.

A flow repeater is made on three single-membrane elements, each of which contains a flow chamber with a nozzle installed in it and a deaf chamber, the flow chambers in the first and second elements are spring-loaded and the chamber in the third element is deaf-connected to the deaf chamber the first and the flow chamber of the third element directly. And through the choke - with the atmosphere, the feed duct is connected to the deaf chamber of the second element directly and to the flow chamber of the same element through the throttle, the output channel of the repeater is connected to the nozzles of the second and third elements, and the nozzle of the first element is connected to the blind chamber of the third element directly.

and with its feed channel - through the choke.

The flow repeater ensures that the pressure transducers of both transducers are independent, resulting in improved device accuracy.

FIG. 1 shows a schematic diagram of a pneumatic computing device; in fig. 2-implementation of the device on single-membrane elements.

The device of FIG. 1 contains a series-connected input pressure transducer to flow /, a flow follower 2 and an output flow transducer to pressure 3.

The input signal in the form of pressure PBX is converted to flow rate QBX, which is fed to the input of flow follower 2. The pressure to flow follower is always. or more PSX, after the repeater it can be anything. Development (independence) of pressure, provided by the flow follower, is the determining condition for device operation. Repeater output

is converted to an output pressure in the transducer 3. This conversion can be carried out on any vessel, including the device’s output line capacity. Therefore, special constructive design.

converter 3 may not have.

The device no FIG. 2 contains an input pressure converter to a flow 1 and a flow 2 repeater containing three single-membrane elements 4- and throttles 7-9. Each single-membrane element contains a blind chamber 10, a flow chamber 11 and a nozzle 12.

The pressure Pnx is converted in the converter 1 to the flow rate QBX-Elements 4 and 5 provide a constant flow Q through the throttle 8. Element 5 through its nozzle provides a constant flow rate Q.

Thus, the flow rate to the output line QDHX QBX + QO - QO and if QO QcP is equal, the required Qsbis QBX equality is realized regardless of the pressure after the converter / i in the output line.

P p e 1D (M e of the invention

I. Pneumatic computing device, which contains a pressure-to-flow transducer and a flow-to-pressure transducer, characterized in that, with the aim of increasing P & .

The Research Institute of Precision, the output channel of the pressure-to-flow transducer is connected to the flow-to-pressure transducer via a flow follower.

2. The device is described in clause 1, characterized in that the flow repeater is made on three single-membrane elements, each of which contains a flow chamber with a nozzle installed in it and a blind chamber, the flow chambers being spring-loaded in the first and second elements the third element is spring-loaded deaf. the chamber, the input channel of the repeater is connected to the deaf chamber of the first and the flow chamber of the third element directly through the choke to the atmosphere, the lithane channel is connected to the deaf chamber of the second element directly and the flow chamber of the same element is through the choke, the output channel of the repeater is connected to the nozzles of the second and third elements, and the nozzle of the first element is connected to the deaf chamber of the third element directly, and to its power channel through

throttle.

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