SU1061154A2 - Pneumatic sawtooth pulse generator - Google Patents

Abstract

PNEUMATIC GENERATOR PULTIBODY PULSE BY ant. St. 714413, distinguished by and with the fact that, in order to reduce appa-. the cost of input, impulse is made in the form of AND and OR elements, the first input is connected to the output of the comparator element, the second input is connected to the output of the AND element and to the control of the valve chamber, and the inputs of the AND element are connected to the outputs of the OR element and the generator pulses.

Description

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The invention relates to pneumatic control and regulation devices and can be used in the construction of automatic control systems in the chemical, petrochemical, mining and other industries.

According to the main author. St. No. 714413 is a pneumatic sawtooth generator, which contains a shear repeater, a pulsating choke, a square impulse generator, a capacitor, a valve, a choke, a relay and a check valve l

The disadvantage of the device is the complexity of the design.

The purpose of the invention is to reduce hardware costs.

This goal is achieved by the fact that in a pneumatic generator a sawtooth pulse contains a repeater with a shift, the output of which is connected to the input of a pulsating throttle, the control chambers of which are connected to the output of a generator of rectangular pulses, and the output with the input of a repeater with a shift, capacitance, nozzle and . the first input of the reference element, the second input of which is connected to. the output of the upper level knob, and the output through the pulsator is connected to the control input of the valve, the flow chamber of which is connected to the output of the lower level master, the pulsator is made in the form of AND and OR elements, the first input of the last one is connected to the output of the comparison element, the second input is with the output of the AND element and with the control chamber of the valve, and the inputs of the AND element are connected to the outputs of the OR element and the square pulse generator .;

FIG. 1 shows the structures in the scheme of the proposed sawtooth generatorJ in FIG. 2principle scheme of the pulsator.

The proposed generator of sawtooth pulses contains 1, FIG. 1) repeater 1 with shift, pulsating choke 2, generator of 3 rectangular pulses, capacitance 4, comparison element 5, power amplifier 6, upper pressure level sensor 7, lower pressure level setting unit 8, valve 9, OR element 10, and AND element eleven. -

The proposed generator sawtooth pulses operates as follows.

With the supply of power to the device, the generator 3 pr begins to work. E) The operation of the pulsating throttle 2. With the help of the repeater 1 with a shift between the input and output of the pulsating throttle, a constant pressure differential is maintained equal to the set shift on the repeater 1 with a shift. At the same time, the inlet pressure always exceeds the outlet pressure by the shear value, which contributes to a linear increase in pressure in the tank 4. However, the linear nature of the pressure increase in the tank 4 is conditional. It should be noted that the operation of the pulsating throttle is based on small increments of pressure at the output of the pulsating throttle with a frequency determined by the 3-pulse generator. When the pressure in the tank 4 becomes equal to the pressure of the setting device 7, the output of the comparison element 5 and, therefore, the output signal of the element 11 and the discrete signal 1 occurs. Considering that the element AND has a relay characteristic, its operation can occur only at the time of the next pressure increment in the tank 4, t, e. at the time of occurrence of a pulse at the output of the generator 3 pulses.

The second condition for the occurrence of the signal at the output of the And 11 element is the presence of a signal at the second input of the And element, which is associated with the output of the pulse generator. This second condition is provided at those times when a signal is generated at the output of the generator and the plume.

When a discrete signal 1 occurs at the output of the element I, which is connected to the control chamber of the valve 9, the valve 9 opens and the emptying of the container 4 to a pressure of 0.02 MPa installed on the setting unit 8 begins.

At the same time, signal 1 at the output of the comparison element 5 immediately disappears, however, due to the presence of the element OR 10, as well as the connection of the output of the element AND with its input through the element OR, the signal at the output of the element AND remains for a long time and disappears when the pulse disappears at the output pulse generator, since the signal disappears 1 la second output element I. -: Thus, the duration of the pulse generated at the output of the element And equal to the duration of any of the pulses generated by the generator 3 pulses.

Typically, the duration of the pulses generated by the generator of the 3 pulses is 0.3-0.5 s, which is sufficient to ensure that the tank 4 is reliably discharged to a pressure value of 0.02 MPa.

When a next pulse occurs, not the output of the pulse generator, the valve 9 becomes closed in the tank 4, the pressure increases again.

The proposed device reduces hardware costs and simplifies the design.

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Claims (1)

PNEUMATIC GENERATOR OF SAWN IMPULSE according to ant. St. »714413, distinguished by the fact that, in order to reduce the app. expenses, the pulser is made in the form of AND and OR elements, the first input being connected to the output of the comparison element, the second input to the output of the element Y and to the control chamber of the valve, and the inputs of the element And connected to the outputs of the OR element and the generator of square-wave pulses.