SU771676A1 - Pneumatic differentiator - Google Patents

Description

54} PNEUMATIC DIFFERENTIATOR

one

The invention relates to pneumatic automation means, namely to pneumatic computing devices, and can be used to measure the flow of liquids either on the inflow into the 5th reservoir, or on the outflow from this reservoir.

Pneumatics 1 hedge differentiators built on pneumatic elements are known.

These devices 1, containing a pressure meter, covered by a delayed communication, an adder and two pneumatic diodes with different conductivities, connected to a summer-15 and a feedback chamber, have significant drawbacks in the narrow range of operation and the impossibility of determining the derivative, appearance at the output of an additional 20, hard to divide, parasitic signal. Suffice it to say that, due to these drawbacks, not one of the devices can be used to measure the flow of liquids or 25 for the inflow into the reservoir, or at the drain from the reservoir by measuring the rate of change of the level in this reservoir.

The closest to this invention is a device that contains

Nozzles, one of which is placed against the blades of an air turbine consisting of a shaft and a turbine wheel, for example, a right-hand rotation associated with a variometer and a tachometer p.

However, using a known device, it is impossible to determine the sign and measure the value of the derivative, which reduces its functionality.

The aim of the invention is to expand the functionality.

Claims (2)

The goal is achieved by installing a second left-hand turbine wheel mounted on a shaft coaxially with the first wheel, a rotation angle transducer, a differential pressure meter, first and second, inverse to the first, regulators and a setpoint controller, the first input of the differential pressure meter through a pneumatic converter the rotation angle is connected to the output of the variometer, the second input is connected to the input terminal of the differentiator, and the output is connected to the variable controller inputs, the task inputs of which are connected to the output of the setpoint controller, and the controller outputs are connected to nozzles arranged against the blades, the turbine wheels of the right and left rotation. Pneumatic differentiator. Represented in the drawing. It contains a right-hand turbine wheel 1 articulated with a load 2 and a rocker 3 having a support .4 with a tachometer 5 including a feedback bellows 6 connected to the output of amplifier 7, communicated by its input to the nozzle 8 at the valve 9 articulated with a rocker arm 3, and a left-hand turbine wheel 10, wheels 1 and 10 are mounted on shaft 11 articulated with a variometer 12 connected to a rotation angle puller 13, connected by its output to the input of a differential pressure meter 14, communicated by its second input to the inlet channel 15 ifferen tsiatora and its outlet - channels with variable regulator 16 and inversion of him by an adjuster 17, specifying which channels are communicated to the output setpoint. 18. The output of the regulator 16 is connected to the nozzle 19 installed by the blades of the turbine wheel 10, and the output of the regulator 17 is connected to the nozzle 20 installed against the blades of the turbine wheel 1. The operation of the pneumatic differentiator changes as the pneumatic signal changes in channel 15 The output of the differential pressure meter 14. Depending on the sign and magnitude of this change, at a given value at the output: setpoint 13, the outputs of controller 16 and controller 17 vary with opposite signs. At the same time, the turbine wheels 1 and 10 will be blown out of the nozzles 19 and 20 under a different pressure, as a result of which the turbine will turn in the direction of the purge from a large pressure. The rotational speed will be measured by a tachometer 5. At the same time, the output of the variometer 12 will be measured in the form of the angle of rotation of its output shaft with the help of a rotation angle transducer 13. The sign of the change in the output of this pneumatic converter is set to compensate for the change in the pneumatic signal in channel 15. Thus, the trimmer works as the tracing system, designed to compensate for any changes in the pneumatic signal in channel 15. The more the rate of change of the pneumatic signal, the higher the speed of rotation of the turbine, and that ometr.Na tahometa output set pressure signal, proortsionalny power supplied by tsenrobezhnymi pnevmoignal weights 2. If the channel 15 is not izmenits, the wheels will Urbina dinakovym purged under pressure occurs kompenatsi cool turbine boiling points. The use of a variometer with a sufficient gear ratio will provide the necessary range of operation of the pneumatic differentiator. Thus, the proposed technical solution allowed to expand the functionality of the pneumatic differentiator and proved to be a reliable means of pneumatic automation. Claims of the invention A pneumatic differentiator, nozzle holders, one of which is placed against the blades of an air turbine of a shaft and a turbine wheel, for example, right rotation associated with a variometer and a tachometer, characterized in that, in order to expand its functional capabilities, it has a second turbine wheel left rotation mounted on the shaft coaxially to the first wheel, rotation angle pneumatic transducer, differential pressure meter, first and second inverse to the first, regulators and unit, the first input of differential pressure meter connected to the variometer output through the pneumatic angle converter, the second input is connected to the input channel of the differentiator, and the output - with the inputs of the variable controller, the inputs of which are connected to the output of the setter, the outputs, of the regulators are connected to the nozzles located | В 1И against the turbine blades s wheel right and left rotation, sources of information, received into account in the examination 1. USSR Author's Certificate 222002, cl. G About G 5 / 00,1965 .. 2.Kosharsky B.D.I.A.Automatic devices, controllers and control machines. L., Mechanical Engineering, 1968, p. 470-473 (prototype). .S4));) About nineteen to