RU2330192C1 - Electrically-driven air-operated ball-valve drive control device - Google Patents

Abstract

FIELD: engines and drives.

SUBSTANCE: device incorporates two electric magnets and two hermetically-sealed reed relays in a blast-proof jacket, air-operated valves, and a panel with lines feeding gas into the ball-valve inlet and forcing it therefrom. The device incorporates an automatic emergency ball-valve shut-off device designed as an air-operated cylinder with a gauging gate reacting to the pressure drop rate in the gas main. With the said drop rate exceeding the preset one, the aforesaid air-operated cylinder gets triggered off to move the rod to actuate a spring mechanism cutting in the ball-valve shut-off air-operated valve. The device is furnished with a spring-loaded plate incorporating an adjusting screw, a rotary lever with a permanent magnet arranged on the lever one end. Here note that the lever is bracket-mounted on the blast-proof jacket inside which a third hermetically-sealed reed relay. The aforesaid rotary lever is designed so that its permanent magnet can act on the third extra said reed relay in operation of the spring mechanism. Here, the rotary lever is coupled via an extra spring with the panel so that the lever other end is in a constant contact with the spring-loaded plate adjusting screw.

EFFECT: higher reliability.

6 dwg

Description

The invention relates to the field of automation of control valves for pipelines and can be used on gas pipelines to control ball valves and automatically close ball valves in case of rupture of the main gas pipeline.

Known electro-pneumatic control device containing electromagnets and reed switches in an explosion-proof shell, pneumatic valves on the panel with channels for supplying working gas and a rotary roller with holders of permanent magnets (Patent RU No. 2146497 C1, 05/07/1998).

The known device provides the opening or closing of a ball valve by remotely supplying a signal to the electromagnets from the control room, as well as local control of the ball valve by manually acting on the control levers of the pneumatic valves.

The known device does not provide automatic closing of the ball valve when the section of the main gas pipeline ruptures, and also does not block the opening of the closed ball valve when the gas pipeline ruptures.

Known electro-pneumatic control device containing electromagnets and reed switches in an explosion-proof enclosure and pneumatic valves, the control levers of which are connected to the pushers of electromagnets, a panel with input and output channels of the working gas and a rotary roller with holders of permanent magnets (Patent RU No. 2131065 C1, 03/17/1998).

The known device provides the opening or closing of a ball valve by remotely supplying a signal to the electromagnets from the control room, as well as local control by manually acting on the levers of the pneumatic valves.

This known device does not provide automatic closing of the ball valve in the event of a rupture of the main gas pipeline and intense emission and combustion of gas, and also does not block the opening of the closed ball valve in this situation.

Known electro-pneumatic control device for actuating ball valves, containing electromagnets and reed switches in an explosion-proof enclosure, pneumatic valves, control levers of which are connected with pushers of electromagnets, a panel with input and output channels of the working gas and a rotary roller with holders of permanent magnets, as well as an automatic emergency shut-off device for ball valves in the form of a pneumatic cylinder, the rod of which acts on the spring mechanism with a pusher for turning on the pneumatic valve for closing the ball valve (Pa tent RU No. 2253762 C1, 04/05/2004).

The known device provides the opening or closing of a ball valve by remotely supplying a signal to the electromagnets from the control room, as well as local control of the ball valve by manually acting on the control levers of the pneumatic valves. The device also provides automatic closing with a ball valve in the event of a break in the main gas pipeline.

However, the device does not provide a blocking of the opening of a closed ball valve when the main gas pipeline ruptures.

Perhaps unauthorized, accidental activation of the drive to open the ball valve from the control panel in the event of a break in the section of the main gas pipeline.

The objective of the present invention is to ensure the blocking of unauthorized opening of a closed ball valve when the main gas pipeline ruptures, i.e. increased reliability and security.

The problem is solved in that in the electro-pneumatic control device for ball valve actuators containing electromagnets and reed switches in an explosion-proof enclosure, pneumatic valves, the control levers of which are connected to the electromagnetic pushers, a panel with working gas inlet and outlet channels and a rotary roller with permanent magnet holders, as well a device for automatic emergency closing of a ball valve, the rod of which acts on a spring mechanism with a pusher for turning on a pneumatic valve for closing a ball the crane, according to the invention, the spring mechanism is additionally equipped with a strap with an adjusting screw, a rotary lever is installed on the housing of the flameproof enclosure, which is equipped with a permanent magnet at one end, and a reed switch is installed in the housing of the flameproof enclosure, which is integrated in the switching circuit of the ball valve opening solenoid, moreover the pivot arm is configured to influence its permanent magnet on an additional reed switch when the spring mechanism is activated, with this rotary lever is connected by an additional spring to the panel so that the other end is in constant contact with the adjusting screw of the strap spring mechanism.

The invention is illustrated by examples of specific performance and drawings, in which:

Figure 1 - depicts a General view of the device;

Figure 2 is a view A of figure 1;

Figure 3 - sectional view of a pneumatic cylinder;

Figure 4 - spring mechanism with an additional strap;

5 is a panel on which a flameproof enclosure, pneumatic valves and a rotary roller with holders of permanent magnets are located;

6 is a sectional view of a pneumatic valve.

The electro-pneumatic control device for the ball valve actuator includes an explosion-proof casing 1 (Fig. 1) of non-magnetic material with electromagnets and reed switches, pneumatic valves for closing 2 and opening 3, panel 4 with input and output channels for the working gas. The flameproof enclosure 1 and the pneumatic valves 2 and 3 are fixed on the upper plane of the panel 4, while the inlet and outlet openings of the pneumatic valves communicate with the corresponding openings in the panel, which respectively communicate with the inlet and outlet channels of the working gas.

On the side surfaces of the panel 4, fittings 6a, 6b (FIG. 2) of the working gas outlet to the ball valve actuator are installed.

Pipes connected to the ball valve actuator (not shown) are connected to the fittings 6a and 6b.

To the fitting 5 (Figure 1) is connected to the pipeline from the main gas pipeline.

Panel 4 has a plate 7 with racks 8 on which the pneumatic cylinder 9 is placed.

A spring mechanism 10 and a fitting 11 with a pipe 12 are installed on the plate 7 for connection with the upper cavity of the pneumatic cylinder 9.

The external thread of the fitting 11 is intended to be connected to a pressure comparison balloon (not shown).

On the panel 4 there is a fitting 13 (Figure 2), connected by a pipe 14 through a distributor 15 with the lower cavity of the cylinder.

The external thread of the fitting 13 is designed to connect the pipeline with the main gas pipeline.

The pneumatic cylinder 9 (FIG. 3) consists of a housing 16 and a cover 17, between which a diaphragm 18 is located. The central hole of the diaphragm 18 is located between the disks 19 and 20, which are installed on the rod 21. A spring 22 is installed between the bottom of the recess of the housing 16 and the disk 20.

To the housing 16 is attached a distributor 15 with shut-off valves 23 and 24 (Figure 2).

On the housing 16 (Figure 3) installed a calibration valve 25 and a shut-off valve 26.

On the lid 17, a fitting 27 is installed for connecting the pipe 12 (Figure 2).

On the threaded part of the rod 21 (Figure 3) is installed a tip 28 with an inner cone on the outside and a lock nut 29 to lock the tip 28 in the configured position.

The spring mechanism 10 comprises a housing 30 (FIG. 4) fixed to the bracket 31. A pusher 32 with a spring 33 is mounted in the housing opening. A stop 34 and a nut 35 are mounted on the threaded portion of the pusher 32.

A dog 36 with a roller 37 is mounted in the groove of the housing 30 on the axis. The dog 36 is provided with a tooth for locking the stop 34 when the pusher 32 is lifted up.

The lever of the pneumatic valve 2 closing the crane is equipped with an extension bar 38 (Fig. 1 and Fig. 6). In the panel 4 (FIG. 5), a rotary roller 39 is installed with two holders 40 of two permanent magnets 41, which act in turn on two reed switches 42, placed in an explosion-proof shell 1.

One reed switch is integrated in the electromagnet enable circuit to open the ball valve, another reed switch is integrated in the electromagnet enable circuit to close the ball valve.

At the lower end of the roller 39, a groove 43 is made with the possibility of its interaction with the protrusion of the ball valve drive shaft.

In some cases, instead of the groove at the end of the roller 39, a pin can be radially mounted or a protrusion made with the possibility of interaction with the groove of the drive shaft.

In the body 44 (FIG. 6) of the pneumatic valve 2 there is a plunger 45 with a tubular channel, a spring 46, a faceplate 47 with a seat, a servo valve 48, a spring 49, a filter drier 50, a plug 51 and a flange 52 in which the seal 53 for the tubular pusher is made 45. In the housing 44 are also located a piston 54 with a seat at the end of its rod 55, valve 56, spring 57, plugs 58 and 59.

The housing 44 is equipped with a bracket 60 with a system of levers and an adjusting screw 61 of the lever 62 of the pneumatic valve.

The pusher 63 of the electromagnet 64 can act on the lever 62. It is possible to act on the lever 62 manually, and the pusher 32 (Figure 4) of the spring mechanism 10 can act on the extension bar 38 of the lever 62.

In the valve body 44, an inlet 66 is made, an outlet 67 and an exhaust gas discharge opening 68 from the actuator.

The inlet 66 through the cavity 56 of the valve 56 is connected by a channel to the cavity of the filter drier 50. In the housing 44 there are also inclined channels 70 for supplying gas to the cavity 71.

The design and content of the pneumatic valve 3 is similar to the design and content of the pneumatic valve 2 except for the presence of an extension bar 38.

On the distributor 15 (Figure 2), a fitting 72 is installed, which is designed to purge the system of gas pressure channels when setting the calibration valve 25 to a predetermined rate of pressure drop. At the same time, a calibrating device with an exemplary pressure gauge is connected to the fitting 72, with which the rate of pressure drop per minute of time is measured.

On the plunger of the spring mechanism 10 (Figure 4), an additional bar 74 is installed, which is located between the abutment 34 and the nut 35. An adjusting screw 75 is installed on the bar 74.

On the housing of the flameproof enclosure 1 (FIG. 1), a pivot arm 77 with a permanent magnet 78 is installed at one end using a bracket 76.

Inside the housing, the flameproof enclosure 1 is additionally equipped with a (third) reed switch 79, which is integrated in the inclusion circuit of the electromagnet for opening the ball valve. The second end of the lever 77 constantly interacts with the adjusting screw 75 of the spring mechanism 10, while the lever 77 pivoting on the axis of the bracket 76 is connected by an additional spring 80 to the panel 4.

An extension roller 81 is installed on the upper end of the roller 39 (FIG. 1), which extends beyond the casing 82. At the upper end of the extension roller 81, an arrow indicates the position of the locking member of the ball valve: “Closed” or “Open”. To do this, on the casing 82 installed plates "Open", "Closed". To prevent atmospheric precipitation and dust from entering the casing 82 at the place where the extension roller 81 exits the casing, a seal 83 is made.

Around the perimeter of the lower part of the casing 82 also made a seal on the casing, which is in contact with the plate 7.

Through the gland 84, a cable is provided for the electromagnets 64 (FIG. 5) and for the reed switches 42 and 79.

The electro-pneumatic drive control device operates as follows.

When applying the electric signal remotely from the control panel to the electromagnet 64, the armature of the electromagnet 64 (Figure 5) pusher moves the lever 62 of the pneumatic valve 2 for closing the ball valve and moves the pusher 45 through the lever system.

The pusher 45 moves the servo valve 48 from the saddle of the faceplate 47, opening the gas supply to the inclined channels 70 of the faceplate 47 and the housing 44. In this case, the servo valve 48 closes the inlet to the tubular channel of the pusher 45. As a result, the working gas through the inlet 5 (Fig. 1), inlet the hole 66 (Fig.6) of the pneumatic valve, the filter drier 50, the inclined channels of the faceplate 47 and the channels 70 of the housing 44 enters the cavity 71 between the plug 59 and the piston 54.

The working gas moves the piston 54 with the stem 55 and the valve 56 to the right, opening the gas supply to the channel 67 and then into the cavity of the pneumatic cylinder of the pneumatic actuator or pneumatic actuator, or into the pneumatic actuator engine. The ball valve closes.

When applying an electrical signal remotely from the control panel to another electromagnet that acts on the lever of the pneumatic valve 3 for opening the ball valve, the operation is carried out in the same order, but at the same time the ball valve opens.

When manually acting on the levers 62 of a particular pneumatic valve, it is also possible to open or close the ball valve.

The electro-pneumatic control device is equipped with a device for automatically closing the ball valve in the event of a gas pipeline rupture and intense gas emission.

This device responds to the rate of pressure drop and when it reaches the rate of pressure drop above the allowable (technological) rate, it activates and actuates the pneumatic valve for closing the ball valve.

This device is made in the form of a pneumatic cylinder 9 (Figure 3).

When the electro-pneumatic control device is connected to the main gas pipeline, the gas through the nozzle 5 enters the channels of the panel 4. Through a separate pipeline from the main gas pipeline, gas is supplied to the nozzle 13 and then through the pipeline 14 to the distributor 15.

In this case, the valves 24 and 26 are open, and the valve 23 is closed. The calibration valve 25 is open and set to a predetermined rate of pressure drop.

From the distributor 15, gas flows through valves 25 and 26 into a standard pressure equalization cylinder and into the cavity on both sides of the diaphragm 18.

After filling the cylinder, the pressure in the cylinder and on both sides of the diaphragm 18 is equalized with the pressure of the main gas pipeline. After that, the valve 26 is closed and the connection between the cavities on both sides of the diaphragm 18 is carried out only through the calibration hole in the calibration valve 25.

The size of the calibration hole can be changed using the micrometer screw. At the same time, corresponding divisions are shown on the valve body 25 and on the dial of the micrometer screw, showing the corresponding size of the cross section of the calibration hole.

Under normal operating conditions of the main gas pipeline, some pressure fluctuation occurs (when connecting or disconnecting a consumer or other reasons).

The calibration valve 25 is configured so that the pneumatic cylinder 9 (Figure 1) does not respond to minor pressure fluctuations (technological value), because the pressure on both sides of the diaphragm 18 (Figure 3) manages to equalize when the gas flows through the calibration hole of the calibration valve 25.

At an intense rate of pressure drop in the main gas pipeline, gas from the cylinder does not have time to flow through the calibration valve into the lower cavity of the pneumatic cylinder 9.

The pressure in the upper cavity of the pneumatic cylinder 9 becomes greater than in the lower, which drives the rod 21.

The rod tip 28 acts on the roller 37 (Figure 4) of the dog 36 of the spring mechanism 10, takes the dog 36 to the side, the emphasis 34 breaks off the dog’s tooth, and the pusher 32 presses the extension bar 38 (Figure 1) of the pneumatic valve under the influence of the spring 33 2 ball valve closures.

The ball valve closes. At the same time, when the spring mechanism 10 is activated, the adjusting screw 75 installed on the bar 74 (Figure 2) acts on the end of the lever 77, rotates it and brings the magnet 78 (Figure 1) to the reed switch 79, which breaks the opening circuit of the electromagnet 64 of the opening pneumatic valve 3 ball valve.

In this state, the entire system of the device remains until the emergency.

After eliminating the emergency situation, the spring mechanism is manually reset to the initial position by lifting the extension bar 38 (Fig. 1) up until the stop 34 (Fig. 4) is installed on the dog’s tooth 36.

In this way, unauthorized (erroneous) activation of the ball valve opening from the control panel in an emergency situation of gas pipeline rupture and intense gas discharge is prevented.

The intensive release of gas into the environment from the main gas pipeline is eliminated, environmental damage is reduced or prevented, and the unauthorized activation of the ball valve at the opening is excluded, which is especially dangerous in the event of gas ignition and a fire.

The new technical solution improves reliability and safety during operation, as well as in the repair of damaged gas pipelines.

From available sources of information, the authors did not identify a device with similar features.

The proposed device is feasible in mass production on existing equipment of a machine-building or instrument-making plant and does not require unique equipment and tools.

The design of the device uses well-known materials.

The spring mechanism began to perform a second function. In addition to turning on the pneumatic valve 2 to close the ball valve, the inclusion of the inclusion of the pneumatic valve 3 for opening the ball valve is made.

Tests at the test site of the Orgenergogaz DAO (Saratov) confirmed the operability, controllability, reliability and safety of the use of an electro-pneumatic control device for ball valve drive on gas pipelines.

Claims (1)

An electro-pneumatic control device for the drive of ball valves, containing electromagnets and reed switches in an explosion-proof enclosure, pneumatic valves whose control levers are connected with pushers of electromagnets, a panel with input and output channels of the working gas and a rotary roller with holders of permanent magnets, as well as an automatic emergency shut-off device for ball valves, the rod which acts on a spring mechanism with a pusher for turning on a pneumatic valve for closing a ball valve, characterized in that the pusher the spring mechanism is additionally equipped with a strap with an adjusting screw, a rotary lever is mounted on the housing of the flameproof enclosure, which is equipped with a permanent magnet at one end, and a reed switch is installed in the housing of the flameproof enclosure, which is integrated in the switching circuit of the electromagnet for opening the ball valve, and the rotary lever is made with the possibility of the impact of its permanent magnet on the additional reed switch when the spring mechanism is triggered, while the rotary lever is connected linen spring with the panel so that the other end is constantly in contact with the adjusting screw of the strap spring mechanism.

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