SU1666816A2 - Pneumatic pulse generator - Google Patents

Abstract

This invention relates to pneumatic automation. The purpose of the invention is to expand the field of application of the pulse generator. The pulse generator contains a sawtooth signal forming unit 1, built on a five-membrane element of comparison 2 with an inertial link — choke 3 and capacity 4

signal comparison unit 5, made in the form of a comparison element 6 and relay 7, switching unit 8, made in the form of a relay 9 and 10. The output signal generating unit 11 is made in the form of a three-membrane comparison element 12, the output of which is connected to the output channel through a relay amplifier 13 14. The mode setting unit 15 is in the form of a throttle divider switch 16 with throttles 17, 18, a repeater with a shift 19, the channel 29 defining the lower zone of the sawtooth signal through the series-connected switch 16, the throttle div Tel repeater 17 and 19 with a shift associated with the negative chamber 30 trehmembrannogo comparing element 12, the plus chamber 26 which snabschena a yield of 24 blocks 1 forming the sawtooth signal. 1 il.

Description

The invention relates to pneumatic automation devices, namely to discrete pulse generators.

The purpose of the invention is to expand the field of application by providing the possibility of changing the frequency without changing the duty cycle, as well as changing the duty cycle without changing the frequency.

The drawing shows a diagram of the device.

The generator contains a sawtooth signal forming unit 1, built on a five-membranous comparison element 2 with an inertial link - throttle 3 and a capacitance 4. The signal comparison unit 5 is made as a comparison element 6 and a relay 7, the switching unit 8 contains a relay 9 and 10. Block 11 forming the output signal includes a three-membrane comparison element 12, the output of which through the relay amplifier 13 is connected to the output channel 14

The mode setting unit 15 comprises a switch 16, a choke divider with throttles 17 and 18, and a repeater 19 with a shift, connected via the choke 20 to the power supply channel 21.

The outputs of the relay 9 and 10 are connected respectively to the channels 22 and 23 of setting the speed and the sign of the signal change of the block 1 The output 24 of the block 1 is connected to the positive side

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the measure 25 of the comparison element 6 and the plus camera 26 of the comparison element 12. The output of the relay 7 is communicated with the negative camera 27 of the element 6.

The normally open nozzle of the relay 7 is connected to the channel 28 of the upper boundary (P0p c) of the zone of change of the saw-tooth signal, and the normally closed nozzle of this relay is connected to the channel 29 of the lower boundary (P0p n) of the zone of the change of the sawtooth signal.

The channel 29 through the switch 16 and the choke divider is connected to a repeater 19 with a shift, the output of which (signal Rzad) is connected to the negative camera 30 of the element 12.

There are two possible modes of operation, which are set using switch 16

In the closed position of the switch 16, channel 29 is connected via a choke divider to a repeater 19. In this mode, when the signal Ropn changes, the pulse frequency changes, and the duty cycle is kept constant. In this case, the parameters of the signals should be selected in accordance with the ratio

(1-K), where Pig is the magnitude of the shift of the repeater 19,

K is the division ratio of the throttle divider.

In the open position of the switch 16, the frequency and duty cycle are set separately by the signals P0n n and P3ad, the last of which is formed by the repeater 19.

The generator works as follows.

Throttle 3 maintains a constant pressure drop defined by

By the signal Rop n, therefore, at the output 24 of block 1, a linearly varying signal P is generated. As long as the signal P Р0п в, the output signal of element 6 is equal to zero. When P Ropa, element 6 switches, its output signal becomes 1. Under the action of this signal, it switches from relay 7, 9 and 10. The sign of the change in signal P changes, but the decreasing signal P will be compared in element 6 to the signal Rn . When P P0p n is reached, relay 6 switches over again and the operation cycle of unit 1 is repeated.

The square of the output signal is determined by the Psad signal supplied to the chamber 30 of the element 12.

Claims (1)

The invention of the pneumatic pulse generator according to ed. St. M; 781417, characterized in that, in order to expand the scope of application, it is equipped with an output signal shaping unit made in the form of a three-membrane comparison element, the output of which is connected to the output channel through a relay amplifier, and a mode setting unit made in the form of a switch, throttle divider and a repeater with a shift, wherein the channel for setting the lower boundary of the zone of change of the saw-tooth signal through a series-connected switch, choke divider and repeater with a shift is connected with a minus signal Amer trehmembrannogo comparing element, the plus chamber of which communicates with the output of the ramp signal generating unit.