SU220595A1 - - Google Patents

Description

DEVICE TO INCLUDE DIFMANOMETERS

The invention relates to the field of instrumentation.

Known devices containing distribution mechanisms that provide manual on-off differential pressure gauges.

The proposed device differs from those known to THAT, in order to automate the process of switching on and off differential pressure gauges and increasing reliability, the device is equipped with a differential pressure transducer, the output of which is connected to an actuator, two capacitances, one of which communicates with one cavity of a hydraulic cylinder with a piston, and the other through the throttle and non-return valve - with the second cavity of the hydraulic cylinder, and the switching device connected by means of a brush to the hydraulic cylinder.

The advantage of the proposed device over the known ones is that it performs switching on and off of differential pressure gauges automatically and allows switching on and off of the additional differential pressure gauge in case of a decrease in the pressure drop on the restriction device relative to the calculated one.

The device contains a differential pressure transducer 1, the output of which is connected to an actuator 2 having a sensing element 3 and a spring 4. The sensing element 3 is rigidly connected to control valves o and 6 control valves 7 and S, and control valves - with capacitances 9 and 10, one of which communicates with a single cylinder cavity //;

the other through the check valve / 2 and the choke 13 with its other cavity. The hydraulic cylinder piston 14 is rigidly connected to the control switch of the switch 15. The pressure drop across the restriction device 16 installed in

conduit 17, measured by diffanometers 18 and 19.

The device works as follows. At certain values of pressure drops occurring on the sound: 1 device

16, readings are taken from the differential pressure gauge 18. When the differential drops for this differential pressure gauge below the calculated differential converter: / issues a command pneumatic signal entering the cavity of the actuator 2. Under the action of this signal, the sensing element 3 of the actuator moves to the extreme position, compressing the spring 4, as a result, the control valve 5 of the distribution valve 6 of the distribution pneumatic valve 8 is closed. Due to the movement of the working pistons of the distribution pneumatic valves, As a result of their operation, the cavity of the container 9 communicates with the atmosphere, and the cavity of the container 10 with a pressure source. As a result, the liquid from the capacitor W through the throttle 13, which ensures a smooth increase in pressure in the hydraulic cylinder, begins to move the piston M and the rigidly controlled rod connected to it of the differential pressure switch 15. When the piston 14 moves, the fluid from the second cavity of the hydraulic cylinder enters the tank 9. After the valves turn on, the switch 15 switches to the differential pressure gauge 19 (shown as being more sensitive than the differential pressure meter 18) to the position shown in the drawing: The pneumatic command signal is removed by the pressure difference. Under the action of the spring 4 of the actuator 2, the valve 6 closes and the valve 5 opens. This in turn causes an increase in pressure in the tank 9, and the cavity of the tank 10 communicates with osferoy. Due to the movement of the piston 14 and the stem of the switch 15 connected with it, the differential pressure meter 19 is turned off and the readings are taken from the device 18.

To protect the sensitive differential pressure meter 19. From possible sharp increases in pressure drop across the restriction device 16, the differential pressure meter is quickly disconnected - when the differential pulse is removed from the command pulse and transferred from the distribution pneumatic valve 7 to the tank 9, the fluid with the piston 14, is forced into the container 10 through a check valve 12.

Subject invention

A device for switching on differential pressure sensors, containing a system of closure elements in positive and negative pressure channels, characterized in that, in order to automate the process of switching-off

differential pressure gauges and increased reliability, it is equipped with a differential pressure transducer, the output of which is connected to an actuator, two tanks, one of which communicates with one cylinder of a cylinder with a piston, and the other through a throttle and non-return valve with a second cylinder of cylinder and including a device connected with a piston rod with a hydraulic cylinder.