RU2258842C2 - Automatic hydraulic system for fluid supply - Google Patents

Abstract

FIELD: hydraulics or pneumatics.

SUBSTANCE: automatic hydraulic system comprises centralized source of fluid and several consumers divided into sections in which at least one of the sections is connected with the source for pressure and drain pipelines provided with the remote controllable stop valve and pneumohydraulic accumulator and pressure gauge connected to the pressure pipeline between the valve and consumers. The pressure gauge is connected with the stop valve through the time delay circuit, indicator of pressure drop in the corresponding section of the hydraulic system, and time delay circuit through the member for opening the valve in the closed position of the member. The output of the time delay member is connected with the alarm signaling system and output of the circuit for closing the valve.

EFFECT: enhanced reliability.

1 dwg

Description

The invention relates to hydraulic systems with remote and automatic control.

Known hydraulic system with automatic shutdown of the hydraulic fluid supply by AS No. 380903, comprising a spool type locking device.

A disadvantage of the known device is its low reliability (slide valve allows for guaranteed leakage of hydraulic fluid in the closed state) and the lack of remote control and signaling about the operation of the device.

The hydraulic system of US Pat. 137-608 (F 16 K 11/00), No. 3807450 of December 15, 72, containing a centralized hydraulic power supply, a hydropneumatic accumulator, a plurality of actuators (consumers) and a shut-off valve with a control electromagnet integrated in the pressure line between the hydropneumatic accumulator and the control valves actuators, as well as the logic block that controls the valve.

The valve automatically opens when there is a control signal at least on one valve and automatically closes when there is no control signal on all valves.

A disadvantage of the known hydraulic system is its low reliability, because during its operation, the serviceability of the hydraulic power supply system for consumers and consumers themselves in a hydraulic system with widely distributed peripherals is not controlled and there is no selective distribution of consumers according to their importance.

When the valve opens automatically when a control signal is sent to a faulty distributor or when the hydraulic system is faulty, an uncontrolled leakage of hydraulic fluid occurs behind the valve, which disrupts all other consumers, as well as violates the environment and fires if the fluid is combustible.

A hydraulic system locking device according to RF patent 2065093 (prototype) is also known, which contains a centralized hydraulic power source and a group of consumers connected to a source of pressure and drain lines with a locking device with an electric remote control in front of consumers in the pressure line, as well as a hydraulic accumulator and sensor pressure connected to the pressure line after the shut-off valve, and in the blocking device the pressure sensor is connected trically through the time delay element to the shut-off valve electric actuator.

A disadvantage of the known device is its lack of reliability due to the lack of remote monitoring of the hydraulic system in its normal and emergency condition and shutdown in case of an accident of the hydraulic power source as a whole, and not a faulty section of the hydraulic system.

In the case of using the known device for shutting off a faulty section of the hydraulic system when the pump is running, the inevitable leakage of the working fluid through the spool-type locking device both in the hydraulic tank and in the places where the hydraulic system ruptures is preserved. In addition, leaks in the hydraulic system, commensurate with leaks through the overflow valve of the device, may not be fixed by a known device and ultimately lead to a loss of operability of the hydraulic system as a whole, which reduces the reliability of its operation.

The purpose of the proposed device is to increase the reliability of the hydraulic system, automatically turn off the hydraulic fluid supply to consumers in the controlled section of the hydraulic system when the section malfunctions (pipe breakage or increased fluid leakage in the faulty distributor from the pressure head to the drain line) and provide remote monitoring of the hydraulic system.

For this, in a hydraulic system with automatic shutdown of the hydraulic fluid supply to consumers, containing a centralized hydraulic power source and several consumers divided into sections, in which at least one of the sections with a group of consumers is connected to a source of pressure and drain lines with shut-off valves installed in the pressure line a remote-controlled valve, as well as a hydraulic accumulator and a pressure sensor connected to the pressure line between the valve and consumers, while the pressure sensor is connected to the shut-off valve through a time delay element, in addition, the pressure sensor is connected to a pressure drop alarm in its section of the hydraulic system, to the time delay element through the valve opening control in the on position of this body, and the output of the time delay element is connected to the alarm and to the output of the valve closing circuit.

The drawing shows a functional diagram of the device.

The centralized hydraulic power source 1 is connected to pressure consumers 2 and drain 3 by highways to consumers. Consumers are divided into groups according to functional characteristics, taking into account the need for constant and periodic work of consumers.

The drawing shows a group of consumers included in the work periodically, conditionally consisting of two consumers 4 and 5 (the number of groups and consumers in groups can be any).

A shut-off valve 6 with remote control is built into the pressure line 2, for example, in the form of two electromagnets: 7 (for opening the valve) and 8 (for closing the valve), and the switch 9 of the electromagnet windings integrated in the valve after opening or closing the valve (switch 9 interacts kinematically with the cores of electromagnets 7 and 8).

Switch 9 has two positions: 10 - the valve is open and 11 - the valve is closed.

The switch 9 is shown in the diagram when the valve 6 is closed.

The valve 6 is built into the line 2 between the source 1 and consumers 4 and 5. Then, after the valve 6, the hydraulic accumulator 12 and the pressure sensor 13 in the pipeline are connected to the line 2.

Valve 6 can be switched on automatically from signals received to turn on consumers 4 or 5 (not shown in the diagram), and remotely. The diagram shows the remote control of valve 6 as the most common and characteristic for consumers working periodically.

For remote control of valve 6, a switch 14 is provided having two positions: 15 - to open the valve and 16 - to close the valve.

The pressure sensor 13, when its contact is closed (pressure is not enough for consumers), is connected to the alarm 17 and through the switch 14 to the time delay element 18.

The switch 14 (in position 15) through the logical element And 19 and the switch 9 of the valve 6 (in position 11) are connected to the electromagnet 7. To the other, inverse, input And 19 is connected to the output of the element 18.

In position 16, the switch 14 through the switch 9 (in position 10) and the logic element OR 20 is connected to the electromagnet 8.

The output of the element 18 is connected to the second input of the OR element 20 and to the alarm 21.

The device operates as follows.

When initially filling the hydraulic cavity of the hydraulic accumulator 12 from the source 1 with the valve 6 open, the contact of the pressure sensor 13 is open and the alarm 17 is not turned on.

Opening the valve 6 from the "closed" position shown in the diagram is done by moving the switch 14 to position 15. Since there is no signal from the output of the time delay element 18 at the inverse input of the And 19 element, the signal is output from the And 19 element through the closed contact of the switch 9, located in position 11, enters the electromagnet 7 of the valve 6, opening the valve. When the valve is opened, the electromagnet 7 transfers the switch 9 to position 10. At the same time, the contact of the switch 9 in position 11 opens, the electromagnet 7 is de-energized, and the switch 9 is prepared to control the closing of the valve 6 from the electromagnet 8.

The capacity of the hydropneumatic accumulator 12 filled with hydraulic fluid is sufficient for consumers to work for a given time.

After filling the hydropneumatic accumulator 12, the valve 6 is closed by moving the switch 14 to position 16.

The signal from the switch 14 through the switch 9, which is in position 10, and the OR element 20 is supplied to the electromagnet 8 of the valve 6, closing the valve. When the valve is closed, the electromagnet 8 switches the switch 9 to position 11, the electromagnet 8 is de-energized, and the switch 9 is prepared to control the opening of the valve 6 from the electromagnet 7.

When the pressure drop in the line 2 is lower than the value acceptable for the consumers to work, for example, when consumers are working or due to an accident - a pipe break, the sensor contact 13 closes and turns on the alarm 17 about the need to replenish the hydraulic accumulator 12.

The switch 14 is moved to position 15 and opens the valve 6 to replenish the hydropneumatic accumulator 12, as described previously. The signal from the output of the sensor 13 through the contact of the switch 14 in position 15 is fed to the input of the time delay element 18.

If after a specified time the pressure in the line 2 does not increase, which will indicate an emergency condition of the pipeline section or one of the consumers, the output of element 18 will receive a signal that includes an alarm 21, blocking element And 19 and through the element OR 20, giving a signal to the electromagnet 8 to close the valve 6.

The application of the proposed device improves the reliability of the hydraulic system, eliminates the constant leakage of hydraulic fluid from a centralized source during idle consumers, as well as determines the emergency condition and automatically disconnects the faulty section of the hydraulic system, preventing the further development of the emergency situation (for example, depriving the hydraulic supply of other, more important consumers, powered by a centralized source, violation of the environment at the pipe break fire and fire).

Claims (1)

A hydraulic system with automatic shutdown of hydraulic fluid supply to consumers, containing a centralized hydraulic power source and several consumers divided into sections, in which at least one of the sections with a group of consumers is connected to a source of pressure and drain lines with a shut-off valve installed in the pressure line with remote control, as well as a hydropneumatic accumulator and a pressure sensor connected to the pressure line between the valve and the consumer mi, while the pressure sensor is connected to the shutoff valve through a time delay element, characterized in that the pressure sensor is connected to a pressure drop alarm in its section of the hydraulic system, to the time delay element through the valve opening control in the on position of this body, and the output of the delay element time is connected to the alarm and to the output of the valve closing circuit.