RU98504U1 - PNEUMATIC DRIVE OF PIPELINE FITTINGS - Google Patents

Abstract

 1. A pneumatic actuator for pipeline fittings comprising a jet engine, a mechanical gearbox, a rocker mechanism, a torque limiter with magnetic reed switches, and an electro-pneumatic control device including electromagnets, pneumatic valves, and a device for information on the final positions of the output shaft with magnetically - reed switches for opening and closing valves, as well as a rotary shaft associated with the output shaft of the drive, characterized in that the information device on the final positions of the drive output shaft is additionally equipped with reed switches installed in pairs with the main reed switches, with an additional reed switch installed in conjunction with the main reed switch closing valve connected in parallel with an opening reed switch located in the torque limiter, and an additional reed switch paired with the main Reed opening valve, connected in parallel with the reed closing valve located in the torque limiter, and each pair of parallel connected reed switches s is in the electromagnet power supply circuit in series with the primary reed switch, wherein the rotary shaft device information of the end positions of the drive output shaft is connected to the output drive shaft assembly muff freewheel. ! 2. The pneumatic actuator according to claim 1, characterized in that the input and output of the additional reed switch, mounted in conjunction with the main reed switch closing valve, are connected respectively to the input and output of the reed switch opening valve located in the torque limiter. ! 3. Pneumatic actuator �

Description

The utility model relates to the field of pneumatic engineering and relates to a device for moving and following the movement of a shut-off element, shut-off and control valves of oil and gas pipelines with remote and local control. The pneumatic drive can be used on pipeline fittings of oil and gas pipelines, in oil and gas production and chemical enterprises.

Known pneumatic actuator containing an electro-pneumatic control device [1], including electromagnets and pneumatic distributors ;, a reversible jet engine, a mechanical gearbox, a rotary rocker-screw mechanism, an output shaft position information device, including magnetic reed switches; limiter of the maximum transmitted torque, as well as a device for absorbing kinetic energy of the moving parts of the drive. The limiter of the transmitted torque contains a mechanism for the rotary movement of permanent magnets and fixed mounted reed switches.

A disadvantage of the known drive is that the transmitted torque limiter is unreliable, difficult to configure. Reed switches are unstable under the influence of the approaching magnetic field of a permanent magnet on a rotary holder. In addition, when the actuator mounted on the valve is turned on, sometimes a false limiter of the moving moment occurs. This is due to the fact that the shutoff valve of the reinforcement has been standing for a long time without movement in the open or closed state, the deposition of solid particles from the composition of the transported product and their coking on the shutoff valve, seat and seals.

In order to move the locking element from its place, at the time of starting the drive, it is necessary to provide increased torque. The drive has such a possibility, but with increased torque that exceeds the maximum transmitted torque allowed for the valve, the torque limiter is activated and the drive stops. In such cases, it is necessary to tear off the locking element of the valve using a manual understudy.

Known pneumatic actuator [2], containing an electro-pneumatic control device, including electromagnets and pneumatic valves; reversible jet engine, mechanical gearbox, rotary rocker-screw mechanism, device for information on the position of the drive output shaft, including magnetic reed switch; limiter of the maximum permissible driving moment, as well as a device for absorbing kinetic energy of the moving parts of the drive. The limiter of the maximum allowable torque for the reinforcement is made in the form of a reciprocating movement of the steel shielding curtain, which is located between the fixed reed switches and the fixed permanent magnets.

This embodiment of the limiter is more reliable and easier to configure. Reed switches are more stable and reliable under normal operating conditions. However, there have been cases of stopping the drive immediately after starting to open or close valves that have been open or closed for a long time.

The objective of the proposed technical solution is to create a drive that eliminates false positives overload when starting the actuator on the valve. In this case, the drive should exclude damage to parts of the drive and valves when placing the link on the body stops, jamming of the locking element when foreign objects get in, thereby preventing an accident on the pipeline, i.e. increase the reliability and durability of the drive. It is necessary to exclude stragging from the valve shut-off body by means of a manual understudy, especially on equipment far removed from the compressor station

The problem is solved due to the fact that in the pneumatic drive of pipeline fittings containing a jet engine, a mechanical gearbox, a rocker screw mechanism, a torque limiter with magnetic reed switches, as well as an electro-pneumatic control device including electromagnets, pneumatic valves and a terminal information device output shaft positions;

containing magnetic reed switches for opening and closing valves and a rotary shaft associated with the output shaft of the drive

The utility model contains a device for information on the final positions of the drive output shaft, additionally equipped with reed switches installed in pairs with the main reed switches, with an additional reed switch installed in conjunction with the main reed switch closing valve connected in parallel with the valve opening switch located in the torque limiter, and an additional a reed switch installed in tandem with the main reed switch for opening valves is connected in parallel with a reed switch for closing valves located in the limiter At present, each pair of parallel-connected reed switches is located in the power supply circuits of electromagnets in series with the main reed switch.

The input and output of the additional reed switch installed in conjunction with the reed switch closure are connected to the input and output of the open reed switch located in the torque limiter, and the input and output of an additional reed switch paired with the valve opening reed are connected to the input and output of the reed switch closing valves located in the torque limiter.

The rotary shaft of the device for information about the final positions of the output shaft of the drive is connected to the output shaft of the drive by a clutch freewheel. The freewheel clutch assembly can be made in the form of a groove at the end of one shaft and in the form of a bar at the end of another shaft, while the bar is located in the groove of the first shaft with a guaranteed clearance. The essence of the utility model is illustrated by drawings and examples of specific performance.

Figure 1 shows a General view of the drive.

Figure 2 is a diagram of a pneumatic drive.

In Fig.3 - torque limiter.

Figure 4 is a section aa in figure 3.

Figure 5 is a view B of figure 4 with the cover 50 removed

Figure 6 - electro-pneumatic control device.

In Fig.7 is a top view of Fig.6 with the casing 66 removed.

On Fig - an example of the execution of the freewheel in neutral and in working position.

The pneumatic actuator (Figure 1) contains a jet engine 1 on the gearbox 2. The gearbox is connected to the housing of the screw mechanism. In the housing 3, the bearings 4 are mounted on the bearings 4 (FIG. 2), connected to the gear 2. In the housing 3, the wings 5 are mounted on the bearings. The 4 screws are capable of axial movement when axial loads occur and when the force is transferred to the wings 5. quenching the kinetic energy of the moving parts of the drive, one end of the lead screw 4 is equipped with a damper 6, the other end of the screw 4 is connected by an end to the pusher of the torque limiter 7. An electro-pneumatic control device 8 is installed on the housing (FIG. 1). The jet engine 1 (FIG. 2) comprises a turbine mounted on bearings in the engine housing 10. The turbine is made in the form of a “Segner wheel” with nozzles 11 and has the ability to reverse rotation. The turbine shaft is equipped with a gear for transmitting rotation to the gears of the gearbox 2. The gearbox is equipped with a steering wheel 12 of the manual backup. Using the lever 13 and the latch 14, the steering wheel is connected to the clutch 15. The clutch, in turn, is located on the shaft 16 using a spline connection. To accelerate the turbine of the engine 1 and the gears of the gearbox 2, an acceleration clutch is provided in it, some cams of which are made at the end of the gear wheel 17, and others on the coupling half 18 connected to the shaft of the spindle 4 using a hollow spline sleeve. A lead nut 19 is provided on the lead screw 4, connected by a leash with crackers installed in the grooves of the wings 5.

For precise positioning in the final positions of the link of the associated output shaft 20 and the valve body, adjustable stops 21 and 22 are installed in the housing 3. The lead screw 4 is connected on one side to the disk springs 24, and on the other to the rod 25 of the torque limiter 7.

With the rod 25 (Figure 3) is connected a shielding steel shutter 26 located on the slider 27 between the fixedly mounted reed switches 28.1, 28.2 and the fixedly mounted permanent magnets 29.1 and 29.2. The output shaft 20 (FIG. 2) is connected to the shaft 30 of the electro-pneumatic control device 8.

The device 8 contains electromagnets 31 and 32, pneumatic valves 33 and 34, and switches made in the form of reed switches 35 and 36, installed inside the flameproof enclosure.

A nozzle 37 is provided for supplying working gas to the electro-pneumatic control device 8 (FIG. 1). The working gas enters the turbine through gas ducts 38 or 39, depending on the required direction of rotation of the turbine and the rotation of the output shaft to open or close pipeline valves (for example, ball valves )

Reed switches 28.1 and 28.2 are mounted on an electrical insulating block 40 (FIG. 3) in a flameproof enclosure 41 of the housing 42 of the torque limiter 7. The permanent magnets 29.1 and 29.2 are made in the form of cylindrical tablets and are installed in the holes of the bracket 43 (FIG. 4) between the stop 44 and shock absorber. 45 ..

The shutter 26 is made of 2 thin steel plates 26.1 and 26.2 (Figure 5) having a L-shaped profile. Both plates are attached to the slider 27 (Figure 4) with screws 46. At the end of the rod 25 (Figure 3) there is a stop 47 with a ball at the end and a thread for adjustment when interacting with the end of the screw 4. The stop 47 is pressed with the rod 25 to the end the screw 4 is carried by a spring 48. The slider 27 is located on the guide plate 49 (Figure 5) in the lower cavity of the housing 42, which is closed by a cover 50 (Figure 4)

An electro-pneumatic control device including a base panel 51 (FIG. 6), an flameproof enclosure 52 consisting of a housing 53 and a cover 54. Two electromagnets 31 and 32 are installed in the housing 53 (FIG. 7). An anchor 55 (Fig. 6) of each electromagnet is connected with a pusher 56 to a lever 57, which is connected through a screw stop 58 with a lock nut 59 and a lever 60 to the pusher 61 of the pneumatic valve 33 or 34. The explosively impermeable sheath is made of a non-magnetic material, mainly of aluminum alloy . In the housing 53, a junction box 62 is installed with the reed switches 35 and 36 (Fig.7). In the base panel 51 (FIG. 6), a rotary shaft 30 is installed, at one end of which a groove 63 is made for coupling it with the pneumatic actuator shaft 20, and an indicator arrow 64 is installed at the other end, covered by the glass 65 of the casing 66. A platform 67 is fixed to the shaft 30 (Fig. 7), on which adjustable holders 68 and 69 are mounted with permanent magnets 70 and 71 fixed to them. The holders are equipped with adjustable screw stops 72 with locknuts 73. A shaft with permanent magnets 70 and 71 outside the housing 53 and the reed switch 35 and 36 inside flameproof enclosure there is a device of information about the position of the output shaft and, accordingly, the locking element of the valve. Arrow 64 is a local pointer, and switchable reed switches provide the appropriate “Open” and “Closed” signals to the control room. The information device is additionally equipped with reed switches 74 and 75, which are paired with the main reed switches 35 and 36 with the possibility of simultaneously acting on each pair with permanent magnets 70 and 71 when magnets are installed under each pair of reed switches in the end positions “Open”, “Closed” after turning shaft 30 to an appropriate position. In this case, an additional reed switch 75, mounted in conjunction with a reed switch 35 of the drive closure, is connected in parallel with the reed switch 28.2 of the drive opening, installed in the torque limiter 7. And an additional reed switch 74, paired with a reed switch 36 of the drive opening is connected in parallel with the reed switch 28.1 of the drive closing installed in the torque limiter. Moreover, each pair of parallel reed switches 75 and 28.2 or 74 and 28.1 is installed in the power supply circuit of electromagnets 34 and 33, respectively.

The casing 66 (Fig.6) of the electro-pneumatic control device is equipped with a door 76 for access to the levers 57 during forced manual control. The rotary shaft 30 of the electro-pneumatic control device is connected to the output shaft 20 of the drive by a clutch assembly made in the form of a groove at the end of one shaft and in the form of a bar at the end of another shaft. Moreover, the strap 77 is installed in the groove 63 with a guaranteed clearance.

Work pneumatic drive.

A gas pipeline under a pressure of 8 MPa (80 kg / cm ² ) is used as a working fluid for the operation of a pneumatic actuator mounted on a ball valve. For optimal operation of the actuator, the gas pressure is reduced and regulated by a pressure regulator installed in the base panel 51 of the electro-pneumatic control device 8. Air or inert gas (such as nitrogen) supplied through pipelines from compressors or high-pressure cylinders can be used as a working medium. The pressure regulator has the ability to reduce the pressure to 0.5-1 MPa (5-10 kg / cm ² ).

In the diagram (Figure 2), the actuator and ball valve are in the "Open" state. The permanent magnet 70 on the rotary shaft 30 of the electro-pneumatic control device 8 approached the reed switches 36 and 74. At the same time, the reed switch 36 turned off and turned off the electromagnet 32. The gas supply through the pneumatic valve 34 stopped and the drive stopped, and the reed switch 74 turned on. Reed switch 74 is connected in parallel with the reed switch 28.1 torque limiter and both of them are installed in series with the reed switch 35 in the power supply circuit of the electromagnet 31. Thus, the power circuit of the electromagnet is prepared for operation.

When an Un signal is supplied from the control room to the electro-pneumatic control device 8, an electromagnet 31 is activated, which turns on the pneumatic valve 33. Gas through gas 39 enters the turbine 9. Under the pressure of the gas ejected at high speed through the nozzle 11, the turbine rotates, transmits the rotation through the gearbox 2 to the lead screw 4. The screw 4 moves the driving nut 19 and through the leash and crackers moves the link 5 from one extreme position to the other when the link is on the stop 21. Under normal operating conditions, torque is required, the magnitude of which is always less than the maximum allowed for the ball valve. When the reinforcement is in the open or closed state for a long time, the particles of solid fractions of the transported product are deposited, and coking is formed on the shut-off element, seals and saddle of the ball valve. There may be an increase in friction between the locking member and the seat due to the diffusion of metals and thermal phenomena. In such circumstances, for stragging from the place of the locking element, it is necessary to apply a torque that can significantly exceed the maximum allowable torque limiter is configured for. In this case, the lead screw 4 rotates, but the link is in place. The screw 4 moves to the left side (Figure 2), the Belleville springs are compressed 24. The shutter 26 blocks the action of the permanent magnet 29.1 on the reed switch 28.1, the reed switch 28.1 is turned off. However, the drive does not stop, since the reed switch 74 is turned on, which is installed in the power circuit of the electromagnet 31 in parallel with the reed switch 28.1. When a torque is reached, the value of which is sufficient to move from the place of the locking member, the backstage moves. For further movement of the scenes, after the breakdown of the locking body, the required amount of torque should be less than the starting one. Belleville springs bring the system connected to the running substance to an equilibrium state.

Reed switch 28.1 is turned on, preparing further operation of the electromagnet 31. The shaft 20 is rotated and after a certain delay, WHICH THE COUPLING OF THE FREE RAY 77 MAKES, STARTED to turn the shaft 30. The magnet 70 moves away from the reed switches 36 and 74. In this case, the reed switch 36 is turned on, preparing the 32-bit power supply circuit , and the reed switch 74 is turned off, preparing to disconnect the electromagnet 31 when the magnet 71 approaches the reed switch 35 or disconnect the reed switch 28.1 during overload.

When overloaded, the lead screw 4 interacts with the pusher 25 of the torque limiter, the shutter blocks the effect of the magnet 29.1 on the reed switch 28.1. and the drive stops. Under normal operating conditions, the permanent magnet 71 approaches the reed switches 35 and 75. The reed switch 35 is switched off and the drive stops. In this case, the link is mounted on the stop 21, and the ball valve is closed.

Reed switch 75 is turned on, preparing the power circuit of the electromagnet 32 to turn on the drive to work in the opposite direction.

The drive with additional reed switches in the output shaft position information device, as well as the freewheel between the shaft of the electro-pneumatic control device and the drive output shaft, eliminates the possibility of the drive stopping from a false actuation of the torque limiter when the drive starts up after it has been in the “Open” position for a long time or "Closed". The result is increased reliability and durability of the drive.

The proposed implementation of the drive is possible in conditions of mass production of a machine-building enterprise.

Information sources:

1. Patent of the Russian Federation. No. 2131065, IPC. F15B 9/03, 1998

2. Patent R.F. No. 2174628, IPC F15В 9/03, 2000

Claims (4)

1. A pneumatic actuator for pipeline fittings comprising a jet engine, a mechanical gearbox, a rocker mechanism, a torque limiter with magnetic reed switches, and an electro-pneumatic control device including electromagnets, pneumatic valves, and a device for information on the final positions of the output shaft with magnetically - reed switches for opening and closing valves, as well as a rotary shaft associated with the output shaft of the drive, characterized in that the information device on the final positions of the drive output shaft is additionally equipped with reed switches installed in pairs with the main reed switches, with an additional reed switch installed in conjunction with the main reed switch closing valve connected in parallel with an opening reed switch located in the torque limiter, and an additional reed switch paired with the main Reed opening valve, connected in parallel with the reed closing valve located in the torque limiter, and each pair of parallel connected reed switches s is in the electromagnet power supply circuit in series with the primary reed switch, wherein the rotary shaft device information of the end positions of the drive output shaft is connected to the output drive shaft assembly muff freewheel. 2. The pneumatic actuator according to claim 1, characterized in that the input and output of the additional reed switch, mounted in conjunction with the main reed switch closing valve, are connected respectively to the input and output of the reed switch opening valve located in the torque limiter. 3. The pneumatic actuator according to claim 1, characterized in that the input and output of the additional reed switch installed in tandem with the main reed opening switch of the valve is connected respectively to the input and output of the closing switch of the valve located in the torque limiter. 4. The pneumatic actuator according to claim 1, characterized in that the freewheel clutch assembly is made in the form of a groove at the end of one shaft and in the form of a bar at the end of another shaft.