RU179542U1 - Electric drive with manual override - Google Patents

Abstract

The invention relates to valves for controlling valves and is used in pipeline transport to control the flow of a working medium, for example, oil, gas, and other products. An electric drive with a manual backup contains a housing in which the shafts of the electric motor and gearbox are connected by means of an overrunning clutch, on the outer casing of which a gear wheel is rigidly mounted. The shaft of the handwheel is made of two half-shafts, one of which carries a helm and the other a gear wheel, half-shafts are connected by means of an irreversible coupling made with the possibility of transmitting rotation only from the helm side. The shafts of the gearbox and the handwheel are perpendicular to each other, and the gears form a gear transmission. The utility model solves the problem of creating a reliable and safe in operation drive with automatic on / off manual override, in which the transmission of torque from the electric motor to the helm of the manual override is excluded both in the normal mode of electrical control and when the motor turns on unexpectedly while the operator is working with manual doubler, and also excluded spontaneous change in the position of the valve when the motor and the manual doubler are stopped.

Description

The utility model relates to actuators for controlling valves and can be used in pipeline transport to control the flow of a working medium, for example, oil, gas, and other products.

An actuator with combined control of pipeline valves from an electric motor and manually in the general case contains an electric motor with a gearbox and a manual backup for controlling the valves in the event of an emergency power outage. The main problem of such drives is the safe switching of the actuator from electric to manual control and vice versa.

The known drives GB 2404717 (publ. 09.02.2005) and RU 2332607 (publ. 08.27.2007), which use a double-sided cam clutch, which, moving along the splines of the driven shaft of the drive, alternately connects either the handwheel shaft or the motor shaft to it breaking another bond. The coupling can be moved to both sides by the lever, or the coupling is moved to one side by the lever and locked by the latch, and returned to the other position by the spring after the latch is unlocked. The main disadvantage of such drives is a great dependence on the human factor, since switching from manual control to electric is possible only by the operator on site.

A known actuator with a manual backup for valve shutter, which regulates the pressure in the pipeline in automatic mode, according to patent RU 56542 (publ. 09/10/2006). The drive contains a housing with an opening, an electric motor with a regulating body located in the 8th housing, a gearbox, the input link of which is kinematically connected to the motor shaft, and the output link is installed opposite the hole in the housing, a handwheel comprising a shaft and a handle for rotating the shaft and made with the possibility of kinematic connection and electrical disconnects for longitudinal movement of the handwheel shaft. The shaft of the handwheel is perpendicular to the shaft of the electric motor, the gear is fixedly mounted on the shaft of the handwheel, the gearwheel is fixedly mounted on the shaft of the electric motor, the gearwheel of which is located on its end surface and is kinematically connected to the gearwheel on the shaft of the handwheel during longitudinal movement of the shaft a handwheel in the direction of the motor shaft, and on the shaft of the handwheel there is a compression spring installed with the possibility of compression tions when longitudinal displacement handwheel shaft toward the motor shaft.

With manual control of the drive, the operator has to simultaneously press on the flywheel, overcoming the resistance of the spring, and rotate it, which is inconvenient and requires great physical effort. If the power is turned on unexpectedly during operation with a manual backup, a blow to the flywheel occurs because The standby is switched off only after the operator lowers the flywheel, which may result in personal injury. T.O. Such a handwheel is very inconvenient to operate and dangerous for the operator.

Known electric drive with a manual backup of patent RU 2364780, 08/20/2009. The electric drive contains, a housing, an electric motor shaft, a gear shaft, a handwheel shaft made of two half shafts, one of which carries a helm and another gear 14, the shafts are connected by means of a coupling, the shafts of the gearbox and handwheel are perpendicular to each other.

The specified gear wheel 14 has the ability to mesh with the gear wheel 9, rigidly mounted on the shaft of the electric motor. The gear wheel 14 is engaged with the wheel 9 only when the handwheel is on. In this case, the gears 14 and 9 are moved to the engaged position with the help of the manual lever 16.

The disadvantage of the electric drive is the inconvenience in operation due to the need to manually switch the operating modes from electric to manual.

Another disadvantage of the electric drive is that when the motor and the manual backup are stopped, the gear 14 is disengaged from the wheel 9, i.e. the wheel 9 does not rest on the wheel 14. The impact of torque from the side of the pipe fittings on the gearbox shaft in the absence of the stop of the wheel 9 on the wheel 14 leads to a spontaneous change in the position of the valve, and therefore to an emergency on the pipeline.

The next drawback of the electric drive is that the dynamic impact from the engine turned on can be felt by the operator (page 5, lines 37-38), i.e. torque transmission from the electric motor to the helm of the handwheel is not ruled out.

Thus, in this electric drive there is no automatic on-off of the manual backup, the transmission of torque from the electric motor to the helm of the manual backup is not ruled out while the operator is working with the manual backup, and the spontaneous change of valve position with the motor and manual backup stopped is not ruled out. an analogue is selected drive RU 2323380 (publ. 04/27/2008) with automatic on-off manual override. The drive contains a housing in which an electric motor, gearbox and manual override are located. The shafts of the electric motor and gearbox are connected by means of a double-sided freewheel, on the outer ring of which at the same time a gear wheel is made with it. A handwheel includes a helm mounted around the housing and connected with its spokes to a wheel with internal teeth, and the diameter of the helm for its practical use, especially in winter conditions, significantly exceeds the diameter of the housing. A wheel with internal teeth and a gear on a double-sided freewheel are interconnected via spurious gears. The sealing of the inner cavity of the housing is provided with an elastic cuff mounted on the outer diameter of the housing on the wheel with internal teeth. The double-sided freewheel contains an asterisk with projections. On both sides of each protrusion are spring-loaded rolling bodies. Between the rolling bodies are the forks of the carrier. Those. The arrangement of the parts around the circumference is as follows: the carrier, the rolling body, the spring, the protrusion, the spring, the rolling body, the carrier, etc.

When the motor shaft rotated in one direction, the carrier drove with its forks on the rolling bodies / located in the direction of rotation of the carrier, completely removing from the jamming only the rolling bodies located along the direction of its rotation and transmitting the rotation to the driven link of the freewheel clutch - an asterisk. The remaining rolling bodies create a small moment of resistance to rotation of the sprocket relative to the cage, caused by sliding friction of these rolling bodies relative to the outer cage and sprocket. In this case, the outer cage is kept from rotation due to the friction force between the elastic cuff and the housing. The disadvantage of the drive is that due to the possible destruction of the cuff material when operating in adverse field conditions and from constant loads, it is possible to transfer torque from the electric motor to the manual backup. This transmission of torque is especially dangerous if the motor is unexpectedly turned on during the operator’s operation with a handwheel, as may result in personal injury.

When the motor and the handwheel are stopped, the output shaft of the gearbox is affected by torque from the side of the pipe fittings (from the action of unbalanced fluid forces), which is transmitted to the input shaft of the gearbox and the overrunning clutch sprocket connected to it. Another drawback of the drive is that this torque is also stopped due to the friction force between the elastic cuff and the body, which is unreliable for the above reasons, and can lead to spontaneous changes in the position of the valve, and therefore to an emergency in the pipeline.

A further drawback of the drive is that the steering wheel has a relatively large diameter with its spokes resting on a wheel with internal teeth equipped with a sealing sleeve, as a result of which, especially when the control station is located on one side, the steering wheel is skewed, which leads to depressurization of the case.

Thus, the task of creating a reliable and safe drive in operation, with automatic on-off of the handwheel, which excludes the transmission of torque from the electric motor to the handwheel of the handwheel both in the normal electric control mode and when the motor turns on unexpectedly during operation, remains relevant. an operator with a manual backup, and spontaneous changes in the position of the valve when the motor and the manual backup are stopped are also excluded.

To solve this problem, an electric drive with a manual backup, as well as the closest analogue, contains a housing in which the motor shaft is connected to the gearbox shaft through an overrunning clutch, on the outer cage of which a gear wheel is rigidly mounted.

Unlike the closest analogue, the shaft of a handwheel is made of two semi-shafts, one of which carries a helm, and the other a gear wheel. The half-shafts are connected by means of an irreversible coupling made with the possibility of transmitting rotation only from the helm side. The shafts of the gearbox and the handwheel are perpendicular to each other, and the gears form a gear transmission.

In addition, the irreversible coupling can be made with a stopper installed across its holder between the forks of the half-shafts, the stopper being able to jam in the holder.

In addition, the stopper is pressed by an elastic element to the fork of the half shaft carrying the helm.

In addition, the elastic element is placed in the coaxial recesses of the stopper and forks of the half shaft carrying the gear.

In addition, the half shaft carrying the helm has the ability to remove the stopper from the jammed position.

In FIG. 1 shows an axial section of a drive; in FIG. 2 is a section AA of FIG. 1 showing an overrunning clutch; in FIG. 3 is a section BB of FIG. 1, showing an irreversible coupling.

An electric drive with a manual backup (Fig. 1) contains a housing 1 in which a shaft 2 of the electric motor and a shaft 3 of the gearbox are installed (the electric motor and gearbox themselves are not shown in the figure).

The shaft 2 of the electric motor and the shaft 3 of the gearbox are connected by means of an overrunning clutch 4 of double-acting. The overrunning clutch 4 (Fig. 1, 2) contains an outer cage 5, carrier 6 (drive link), output shaft 7, sprocket 8 (driven link), rolling elements 9 and springs 10. A gear wheel 11 is rigidly mounted on the outer casing 5.

The shaft of the handwheel (Fig. 1) contains an input half shaft 12 with a steering wheel 13 mounted on the input half shaft 12 to ensure tightness, and an output half shaft 14 with a gear 15. Half shafts 12 and 14 are connected by means of an irreversible double-acting clutch 16 transmission of rotation only from the helm side 13. The shaft of the handwheel is installed perpendicular to the shaft 3 of the gearbox. The gears 11 and 15 are in gearing with each other, i.e. form a gear transmission. The irreversible coupling 16 can be of any design, for example, based on a ratchet mechanism, a jammed stopper, etc.

Preferably, the irreversible clutch 16 (FIGS. 1, 3) is made with at least one stopper 18 mounted across the yoke 17 so that it can jam. In this case, the input half shaft 12 is connected with its fork 19 to the fork 20 of the output half shaft 14 through the stopper 18. The surfaces of the stopper 18 (Fig. 3) mated with the yoke 17 are beveled opposite to each other in the direction of the fork 20. The stopper 18 is pressed by the elastic element 21 to the fork 19 of the input half shaft 12. The elastic element 21 is placed in the coaxial recesses of the stopper 18 and the yoke 20.

To close (open) the pipe fittings, an electric motor is turned on. The rotation of the motor shaft 2 in any direction is transmitted to the carrier 6. The carrier 6 acts on the rolling bodies 9 located in the direction of its rotation, compresses the springs 10 conjugated with them and removes the rolling bodies 9 located in the direction of the carrier 6 rotation from the jammed position. The moment of resistance to rotation of the sprocket 8 from the side of the remaining rolling elements 9 is not transmitted through the outer race 5 to the handwheel due to the irreversible clutch 16, and the sprocket 8 through the output shaft 7 transmits rotation to the shaft 3 of the gearbox. In the particular case of irreversible clutch 16, the outer casing 5 is kept from rotation due to the stop of the fork 20 of the output shaft into the stopper 18 stuck across the cage 17, which is pressed by the elastic element 21 to the fork 19 of the input shaft. Thus, the transmission of torque from the electric motor to the helm of the handwheel in the electric control mode is excluded.,

The rotation of the handwheel 13 of the handwheel in any direction transfers the rotation to the input half shaft 12, which, through the irreversible coupling 16, transfers the rotation to the output half shaft 14. In the particular case of the irreversible coupling 16, the rotation of the steering wheel 13 transfers the rotation to the input half shaft 12 with the plug 19. Rotation of the fork 19 of the input half 12 presses on the elastic element 21 and removes the stopper 18 from the jammed position due to its beveled surfaces 20 in the direction of the fork 20 /, which leads to the transmission of rotation to the output half shaft 14 through its fork 20. Next, the output p 14 by Luwa gear rotates the outer ring 5. The outer yoke 5 captures the rolling elements 9 in the course of its rotation, which rotates the shaft 3 of the gearbox. As a result, the torque from the helm 13 of the manual understudy is transmitted to the gearbox to close (open) the pipe fittings in manual control mode.

When the electric motor is turned on, the carrier 6 removes the rolling bodies 9, located in the direction of rotation, from the jammed position and disengages their connection with the outer race 5. The moment of resistance to rotation of the sprocket 8, caused by sliding friction of the remaining rolling bodies 9 relative to the outer race 5 and the sprocket, is transmitted to the manual backup 8, is excluded due to the irreversible clutch 16. In particular, due to the jammed position of the stopper 18 in the yoke 17. For better jamming, the stopper 18 is pressed by an elastic element 21 to the fork 19 of the input shaft 12. At the same time but with the its motor shaft 2 via the carrier 6, the rolling elements 9, sprocket 8 and the output shaft 7 transmits the rotation to the shaft 3 and further to the gearbox pipe fittings.

When the motor and the handwheel are stopped, the output shaft of the gearbox (not shown in the figure) is affected by torque from the side of the pipe fittings (from the action of fluid pressure), which is transmitted to the shaft 3 of the gearbox, the output shaft 7 and the sprocket 8 of the overrunning clutch 4 connected to it The sprocket 8 captures the rolling bodies 9 in the direction of its rotation and wedges them between the beveled planes of the sprocket 8 and the outer race 5, thereby creating a torque on the latter. The outer casing 5 remains stationary; due to the irreversible coupling 16. In particular, due to the stop of the fork 20 of the output shaft into the stopper 18 stuck across the holder 17, which is pressed by the elastic element; 21 to the plug 19 of the input half shaft. As a result, a spontaneous change in the position of the valve from the influence of unbalanced forces created by a pressurized fluid is excluded, and therefore, emergency situations on the pipeline are excluded.

Thus, a very reliable, safe and easy-to-use design of a shut-off valve actuator with automatic on-off manual override is proposed.

Claims (5)

1. An electric drive with a manual backup, comprising a housing in which the shafts of the electric motor and gearbox are connected by means of an overrunning clutch, on the outer ring of which a gear wheel is rigidly mounted, characterized in that the shaft of the manual backup is made of two half-shafts, one of which carries a helm and the other is a gear wheel, the half-shafts are connected by means of an irreversible coupling made with the possibility of transmitting rotation only from the helm side, the shafts of the gearbox and the handwheel are located perpendicular to each other, and Cogged gears form a gear train. 2. The drive according to claim 1, characterized in that the irreversible coupling can be made with a stopper installed across its cage between the forks of the half-shafts, the stopper being able to jam in the cage. 3. The electric drive according to claim 2, characterized in that the stopper is pressed by an elastic element to the fork of the half shaft carrying the helm. 4. The electric drive according to claim 3, characterized in that the elastic element is placed in the coaxial recesses of the stopper and the fork of the half shaft carrying the gear wheel. 5. Electric drive according to any one of paragraphs. 2-4, characterized in that the half shaft bearing the helm has the ability to remove the stopper from the jammed position.

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