SU708382A1 - Air-operated indication device - Google Patents

Description

The invention relates to the design of pneumatic multipoint alarm devices that provide a visual indication of process violations, the occurrence of hazardous situations or equipment failure. Pneumatic alarm devices are known, including d-positional indicators and pneumatic contacts controlled, for example, by parameter deviation alarms and Indicating the input of indicators to the atmosphere, then to the power supply channel 1. However, such devices are not very implausible because the position of the newly activated indicator does not differ from the provisions of previously triggered indicators. . This disadvantage is eliminated in the signaling devices, in addition to the torus from the moment it trips to the receipt of the acknowledgment signal. The closest in technical essence to the proposed invention is a pneumatic multi-input signaling device, comprising an oscillator, a dropping switch and two single-membrane elements with a spring in a deaf chamber, the first of which is connected to the power supply channel, the chamber is deaf with a deviation alarm output parameter, and the nozzle through the flow chamber and the nozzle of the second single-membrane element is connected to indicator 2. The disadvantages of this device are its complexity, high supply air flow, limited operability (if the generator turns on after the alarm trips, the parameter deviation will not blink). The purpose of the invention is to simplify the device and increase reliability. The goal is achieved by the fact that the device has a third single-membrane element with a spring in a deaf chamber, the nozzle of which is connected to the supply channel, the chamber is deaf - with the parameter deviation indicator output, and the flow chamber - with the output of the throttle divider, one input of which is connected to the switch output and the second input is with the nozzle of the second single-membrane element, the deaf chamber of which is connected to the output of the oscillation generator.

The drawing shows a schematic diagram of one of the cells of a pneumatic signaling device designed to indicate deviations in one control channel.

Each such cell contains a parameter deviation detector 1, a two-position indicator 2, single-membrane elements 3, 4, 5 with springs in deaf chambers and throttles 6 and 7 forming the throttle divider. In addition, the signaling device includes a generator of oscillations 8 common to all cells and a switch - an acknowledgment button 9.

The output of the detector 1 is connected to the blind chambers of the elements 3 and 5. The continuous chamber of the element 3 and the nozzle of the element 5 are connected to the feed channel. The nozzle of element 3 is connected to the flow chamber of element 4, the deaf chamber of which is connected to the output of generator 8. The nozzle of element 4 is connected to indicator 2 and through throttle 6-- to flow chamber of element 5, which is also connected to output of acknowledgment button 9 via choke 7,

The device works as follows.

With a single output signal of the detector 1 (opla elements 3 and 5 are closed, and the input of the indicator 2 through the throttles b and 7 and the acknowledgment button 9 is connected to the atmosphere. The operation of the generator 8 does not affect the position of the indicator 2.

When the detector I triggers, its output signal changes from O to 0, which leads to the opening of the nozzle of the element 3 and the supply pressure element 4 to the flow chamber. In this case, with a single output signal of the generator 8, the nozzle of the element 4 is closed, and at zero it is open, and the indicator 2 is in the blinking state, since with open nozzle element 4

one

the indicator input will be

when closed - O due to the release of air through the throttles 6 and 7 and the crop 9 into the atmosphere. In this case, the conductivities of the chokes 6 and 7 are selected so that with a single signal at the input of the indicator 2, the force from the pressure in the flow chamber of the element 5 is less than the spring force in its blind chamber.

When the acknowledgment button 9 is pressed, the pressure in the flow chamber of the element 5 increases, the nozzle of this element opens, connecting the flow chamber to the feed channel. At the output of the indicator 2, a single signal is established, which is not affected by the operation of the generator 8, or the release of the button 9, since the force from the action of the supply pressure exceeds the force of the spring of the element 5.

The return of the deviating parameter to the permissible limits causes a change in the output signal of the signal, the mash 1 with O on, which leads to the subsequent closing of the nozzles

ABOUT

all elements and dropping to

pressure in the flow chamber of the element 5 and at the input of the indicator, i.e. to return the device to its original position.

The indicators are also checked by pressing the button 9. In this case, a single signal from the button output through the throttles 7 and 6 passes to the indicator 2, causing it to be triggered. When the button is released at the indicator input, the zero signal is again set.

This device differs from the prototype in a smaller number and smaller nomenclature of the elements used, significantly (more than 2-3 times) lower consumption of supply air, as well as greater reliability.

Claims (2)

1. USSR author's certificate No. 224893, cl. G08 B 71/04, 06.22.67. 2. Operational control unit COMAG-SO By content technical design note 2Д2.565.002ПЗ. M., TSNIIKL, 1976, sheets 21-22, fig.6, (prototype).