RU18432U1 - ELECTRIC DRIVE FOR PIPELINE FITTINGS - Google Patents

Description

EZHKTROPRVYOD for PIPELINE FITTINGS

The utility model relates to the field, pipelines of transport, and relates to an electric drive for pipeline valves, mainly oil pipelines.

The electric drive is intended mainly for use on environmentally hazardous sections of pipelines - Gy to the banks of reservoirs, in residential areas, technologically hazardous industries, etc.

A known electric drive containing an electric motor, a gearbox, a motor shutdown mechanism at the end positions of the valve body and a torque limiting mechanism, including springs on the shaft of the gearbox worm moving along the axis ..

This electric actuator is equipped with a backup pneumatic rotary actuator and with its help a one-time pipeline shut-off can be carried out in the event of a pipeline rupture in the absence of power supply or other emergency situation (certificates N 3804, F16K31 / 00 for utility model; Redundant actuator of shut-off and control valves of oil pipelines, Bul.M March 3, March 16, 1997).

The pneumatic engine can operate when a fluid medium (air, gas) is supplied to it. Sources of a fluid working medium can be high pressure cylinders with compressed gas or solid fuel gas generators. Inclusion in works} / sources of a fluid working medium is carried out via a radio signal or using a telemetry communication system.

 about

To close the valve, it is impossible to set exactly the required amount of the working medium. It depends on many factors, including the magnitude of the pressure, climatic, local environmental and other conditions that cannot be taken into account.

Therefore, the amount of working medium is set with a large excess in order to guarantee complete closure of the fittings in any case.

At the same time, having completed work on blocking the pipeline, the air motor continues to work until the supply of the working medium is completely exhausted.

To avoid damage to the elements of the electric drive, air motor and valves, safety clutches and load devices are used that complicate, weight and increase the cost of the design.

A known electric drive to the valves of pipelines containing an electric motor, a worm gear, m, a mechanism for turning off the electric motor at the final positions of the gate valve, a mechanism for limiting the magnitude of the torque, including springs located on the shaft moving along the axis of the worm, and an air motor in the form of a turbine with a gearbox , a spring-loaded half-coupling and an adjustable limiter of its stroke are mounted movably along the axis on the output shaft of the air motor, and at the end of the worm shaft A half-coupling is connected, which is connected to the spool of the system for supplying a working medium to an air motor. / Certificate No. 7466, PI6 K 31/50 for utility model Electric actuator for pipeline valves, Bull. Ш, 1б.06.98 /, The execution of the slide valve eliminated the need for a safety coupling. However, the appearance of a spool instead of a safety clutch did not simplify the design sufficiently, and an additional pipe appeared - from a spool to a pneumatic motor. I The existing version of the spool with a long stem in the screw openings does not provide reliable operation when using solid fuel gas generators. The resinous gas components of the solid fuel g generator penetrate into the guide and prevent moving the stem with the hood. The valve design did not provide tightness and part of the gas continued to flow into the air motor. Thus, the spool is obtained for one-time use, after which it is necessary to replace it or carry out repair work. The pneumatic engine can operate under gas pressure in a wide range (6 ... 30 kgf / sq.cm) depending on the magnitude of the torque resistance of the valve. With a partial ingress of gas into the pneumatic engine, the gas pressure can reach a value in b kgf / sq.cm or more at a significantly higher pressure of the gas entering the spool. This can lead to breakdown of the elements of the air motor, electric drive or fittings, create an emergency.

The present utility model is based on the task of creating such an electric actuator with a pneumatic engine, in which the ingress of working gas into the pneumatic actuator from the moment of complete closure of the UH-matura would be reliably excluded, reliable operation of the spool valve would be ensured, and the design of the pneumatic actuator would be simplified.

The problem is solved by the fact that in an electric actuator for pipe fittings containing an electric motor, a worm gear, a pneumatic motor in the form of a turbine with a gearbox, a coupling half movable along a single shaft of the pneumatic motor and a coupling half on a worm that is movable along the axis and connected to the spool of the feed system working medium into a pneumatic engine, according to the proposal, the valve valve is made in the form of a disk with seals on both sides and is preloaded by a spring to the seat of the valve outlet, a gas-blowing cone is made on the valve stem, and the turbine of the pneumatic engine is installed between its gearbox and the spool, while the turbine inlet pipe is located in the spool cavity coaxially with the valve and the valve stem travel distance.

In the future, the proposed utility model is illustrated by specific examples of its implementation and the drawing, which shows the proposed electric drive in section along the axis of the worm of the worm gearbox, the spool of the system for supplying the working medium to the air motor and a partial section of the gearbox of the air motor.

- 4 The electric drive contains a housing 1 of a worm gear, worm E and a worm wheel 3 on the shaft 4.

The shaft 4 interacts with the shutoff body u) of the pipeline mat (not shown in the drawing, ano).

A box 5 is attached to the housing 1 of the worm gearbox, on which an electric motor b with a gear connected to the gear wheel of the worm shaft 2 is mounted.

A rotary pneumatic motor 7 is connected to the box 5 in the form of a turbine 8 and a gearbox 9. At the outlet wayau 10 of this engine, a coupling half 11 and an adjustable limiter 12 of the coupling half stroke 11 are mounted movably along the axis of the coupling half 11. The spring coupling 13 is clamped to the limiter of the coupling half 11.

At the end of the shaft of the worm 2, a half-coupling 14 is installed, which is connected by a lever 15 to the rod 16 of the spool 17 of the working medium (gas) supply system to the air motor 7.

The valve 18 of the spool is made in the form of a disk with seals on both its sides and is spring-tightened 19 to the seat 20 of the outlet 21 of the spool. On the stem 16, a gas outlet 22 is filled, which prevents the resinous gas components of the solid fuel gas generator from entering the guide holes of the rod when the gas is virozed from the outlet 21 of the spool.

The turbine 8 of the pneumatic engine is installed between its gearbox 9 and the spool 17. In this case, the turbine inlet 23 is located in the spool cavity coaxially with the valve 18 at a distance of the stroke of the rod 16 with the valve 18 and serves as a second seat for the valve 18.

The device operates as follows. In the initial position, the coupling half of the gearbox 9 of the air motor 7 is in the extreme left (upright) position on the shaft 10 and has its own flange with slots 24 which are 11a behind the stopper 25.

If there is no power, a command is given to turn on the air motor 7.

In the pneumatic engine 7 enters the medium (gas). The impeller of the turbine 8 begins to rotate and transfers

rotation through the gearbox 9 to the shaft 10 with the coupling half 11.

At the moment of alignment of the slot 24 on the flange of the coupling half 11 with the stopper 25, the coupling half 11 moves under the action of the spring 13 to the extreme right (according to the drawing) position to the adjustable limiter 12.

In this case, the cams of the coupling half 11 enter the troughs of the coupling half 14 and act on the cams of the coupling half. The worm 2, the worm wheel 3 and the shaft 4 rotate.

The shaft 4 acts on the valve body of the valve and closes the pipeline. The valve body of the valve moves to the stop. Then the shaft 4 stops the rotation. Stops the rotation and the worm wheel 3.

The worm continues to rotate and is screwed along the teeth of the worm wheel 3, moves along the axis to the right (according to the drawing).

- 6 /

The coupling halves move because the coupling half 11 is located on the limiter 12 of its stroke, and the coupling half 14 moves away from the coupling half 11, but does not disengage from it due to the elongated cams.

At the same time, the coupling half 14 with an FAULT flange acts, for example, on the lever 15, and the lever 15 moves the rod 16

lottery 17 in the extreme left position (according to the drawing).

When this valve 18 closes the hole in the pipe 23 of the turbine 8.

The supply of the working medium (gas) to the turbine 8 of the air motor 7 is stopped, and the working medium flows through

an opening outlet 21 into the atmosphere.

In this case, the resinous gas components of the solid fuel gas generator are discarded to the sides of the guide holes of the rod 16 with the help of the gas breaking cone 22.

Thus, a one-way overlap of the pipeline is carried out.

Pneumatic engine 7 stops working and thus excludes further impact of torque on the drive elements and valves.

The working medium (gas) continues to enter the atmosphere until it expires and the pressure drops to atmospheric pressure.

To re-operate the air motor, the coupling half 11 must be brought to its original position, i.e. insert the flange behind the stopper 25.

- 7 Then it is necessary to charge the vessels with the working medium or replace them, or to weigh the solid fuel gas generators of the medium (gas) supply system with an air motor.

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

This embodiment of an electric drive with a backup pneumatic motor ensures complete shutoff of the pipeline reinforcement by the shutoff body in the absence of power supply, eliminates the transmission of torque of the air motor to the electric drive elements and valves after the pipeline is re-piped.

The proposed implementation of the valve spool increases the reliability of the termination of the pneumatic actuator at the time of complete closure of the pipeline shut-off valve.

The design of the pneumatic engine is simplified due to the elimination of the intermediate (KHS at the prototype) tube from the spool to the entrance to the pneumatic drive turbine, as well as due to the simplified design of the spool, which turned out to be more technologically advanced to manufacture.

The pneumatic actuator can operate from any rasa source.

Specific examples of the electric drive, air motor and its elements confirms the possibility of implementation and use in industry of the proposed electric drive. - 8

Claims (1)

An electric actuator for pipeline valves, comprising an electric motor, a worm gearbox, a pneumatic engine in the form of a turbine with a gearbox, a half-coupling movable along the output shaft of the pneumatic engine and a half-coupling on the worm, which is movable along the axis, which is connected to the spool of the medium supply system to the pneumatic engine, characterized in that the valve valve is made in the form of a disk with seals on both its sides and is spring-tightened to the seat of the valve outlet; cone, and the turbine of the pneumatic engine is installed between its gearbox and the spool, while the turbine inlet pipe is located in the spool cavity coaxially with the valve at a distance of the valve stem stroke.