CS235201B1 - Monostable fluid flow logic with combined control - Google Patents

Abstract

The invention belongs to the field of automation and measurement technology and solves the problem of reducing the required control current energy for switching a monostable fluidic logic current element and improving its dynamic properties. Essentially, the monostable fluidic logic current element is provided with a negative pressure control channel, two logically complementary output channels and an excess pressure control channel, connected via a coupling resistor to the power supply channel.

Description

The present invention relates to a monostable fluidic flow logic element with combined control, belongs to the field of automation and measurement technology and solves the task of reducing the control current energy required to switch the monostable fluidic flow logic element, in particular in processing the output signals of fluid distance sensors.

In the hitherto known methods for controlling monostable fluid flow logic elements by means of an overpressure or underpressure control signal, at the desired energy level of its output signals, the required control current energy depends on the supply pressure and input impedance of the control channels and can only be achieved by a relatively high supply pressure of the control source. This causes high consumption of the working gas of the fluidised-bed sensor, a considerable force effect of the sensor on the measured object and deterioration of dynamic properties of the measuring channel.

The aforementioned drawbacks are eliminated by the monostable fluid stream logic element with combined control according to the invention, which is characterized in that the monostable fluid stream logic element is provided with a vacuum control channel, a first stable logically complementary output channel, a second logically complementary output channel and a logically complementary output channel. an overpressure control channel coupled via an internal coupling resistor to the supply channel of the monostable fluidic current logic element. The coupling resistor is a structural component of such a monolithic, planar integrated fluid circuit, and the internally coupled monostable fluid current logic element functions as a fixed comparator.

The advantages of the monostable fluidic current logic element with combined control are that the required energy level of the information control current, the sensor's force on the measured object, the working gas consumption, the measuring range and the dynamic characteristics of the distance measuring circuit are significantly reduced.

In the attached drawing, FIG. 1 schematically depicts an internal circuit of a monostable fluid flow logic element with combined control, FIG. 2 shows an overpressure characteristic of the overpressure control in FIG. 3 shows a switching characteristic for vacuum control and FIG. 4 in combination control.

A monostable fluidized-stream logic element with combined control (FIG. 1), which constitutes a supply channel 11, powered by a pressure Pn from a supply pressure source 30, a positive pressure control channel 12 with a positive control pressure Pp, a negative pressure control channel 13 with a negative information control pressure Pm of an information control vacuum source 40, a first stable logical complementary output channel 14 with an output pressure Pvs, and a second logically complementary output channel 15 with a logically complementary output pressure Pns and a coupling resistor 20 connected between the supply channel 11 and the pressurized control channel 12.

At zero pressures in the control channels 12, 13, the geometric shape of the monostable fluid flow stream logic 10 ensures that at the final load resistances of the outlet channels 14, 15, working gas flows from the supply pressure source 30 through the first stable logical complementary outlet channel 14 and outlet pressure Pvs. is greater than atmospheric. Upon activation of the overpressure control channel 12 by the control pressure Ppi or the underpressure control channel 13 at the control pressure Pml, the current from the supply channel 11 is switched to a second logically complementary outlet channel 15 in which it is held until the respective control pressure ceases (FIG. 3).

The principle of the combined control is that by means of a coupling resistor 23 a positive bias or an additional control current is created in the overpressure control channel 12 by the control pressure Ppk, which is not sufficient to switch the supply current from the first stable logically complementary output channel 14. reduces the necessary negative information control pressure threshold Pmk from the information control vacuum source 40.

The basic wiring can be advantageously used in conjunction with a fluid reflection sensor. The principle can also be applied to a monostable fluidized-bed current logic element with a positive pressure control with a passive logic product on the positive pressure control input.

Claims (1)

A monostable fluid flow logic element with combined control, characterized in that it is provided with a vacuum control channel (13), a first stable logically complementary output channel of the invention (14), a second logically complementary output channel (15), and a pressurized control channel (12) connected. via an internal coupling resistor (20) with a supply channel (11).