Drive pipeline valves

 

Drive pipeline valves designed for use in pipeline transportation of oil, gas, and other products. The actuator includes a gear mechanism. The latter contains the shaft. On the last nesosna has at least one freely rotating on the shaft of the threaded screw in a pair with the nut. Nut coaxially with the shaft and has a diameter greater than the thread diameter of the screw on the value of twice the eccentricity between the axis of the screw and the shaft. Inside the nut is the slider and the planetary gear. The latter includes a gear wheel (satellite). The latter is rigidly and coaxially connected with a threaded screw (planet carrier). Provides less complexity in manufacturing. 3 C.p. f-crystals, 2 Il.

The invention relates to the control of the driving devices for pipeline valves and can be used in pipeline transportation of oil, gas, and other products.

Known drive [1], including the motor, gear mechanism in the gear box, which contains kinematically interconnected gear and worm gear.

Known actuator [2], including engine speed, gear in the gearbox.

The disadvantages of the measures the design complexity of the mechanism that converts rotational motion to linear motion.

Known drive [3], adopted for the prototype, including the motor, bearing housing, gear containing intermediate body roll.

The disadvantages of the device [3] are the complexity of the structure, its large size and weight, the complexity in manufacturing, the need in addition to the mechanism of translational movement to have the gearbox.

The task of the invention is to expand the Arsenal of technical means for the actuation of pipeline valves by creating a drive with high technical and operational characteristics, in particular with high efficiency transmission mechanism, small dimensions and weight, convenient and safe in use and maintenance, less time-consuming to manufacture.

This task is solved by improved transmission mechanism, based on the principle of rolling screw pair, and other drive elements.

As a prototype, the actuator includes a motor drive with gear mechanism.

Unlike the prototype gear includes a shaft on kotoroy with the shaft, thread diameter which is larger than the diameter of the thread of the screw on the value of twice the eccentricity between the axis of the screw and shaft, and pitch equal to the pitch.

The actuator may include a slider located within the nut, planetary gearing including a gear wheel (satellite), rigidly and coaxially connected with a threaded screw (planet carrier), and the Central gear wheel rigidly connected with the slide and coaxially with the shaft.

The actuator may also include a mechanism for manual rotation of the shaft mounted on the shaft coupling comprising two coupling Cam mating end surfaces, with one of the coupling halves is made rigidly mounted on the shaft, and the other with covering its outer teeth and with the possibility of axial movement, a gear transmission mechanism between manual rotation of the shaft and the coupling with external teeth, limiting the axial movement of the coupling with external teeth, preventing the release of her Cam out of engagement with the Cam the other half.

Along the length of the drive body can be located at least one through channel having an opening into the internal cavity of the housing at its base and the hole above the moving elements of the transfer mechanism.

Ustrojstven, 4 - nut 5 - slide 6 - gear (satellite) of the planetary gear 7 to the Central gear of the planetary gear, 8 - mechanism of the manual shaft rotation, 9 - coupling rigidly mounted on the shaft 2, 10 - coupling with covering its outer teeth and the possibility of axial movement, 11 - gear mechanism between 8 manual rotation of the shaft and the coupling 10 with outer teeth 12 limiting axial movement of the coupling 10 with outer teeth, preventing it from engagement with the coupling 9, 13 - case, 14 - channel along the length of the housing 13, 15 output channel 14 at the base of the housing 13, 16 - channel output 14 on the moving elements of the transfer mechanism.

In Fig.2 shows a helical scan lines of the threads of the screw 3 and nut 4 and marked: l1- circumferential length of the expanded helical thread of the screw 3, l2- circumferential length of the expanded helical line of the thread of the nut 4, S is the step size of the thread, the same screw 3 and nut 4,1- the angle at the top of the thread profile of the screw 3,2- the angle at the vertex of the profile of the nut thread 4, d is the diameter of the thread of the screw 3, D - diameter of the nut thread 4,- plot the difference between the circumferential lengths and screw l is 4.

The device (Fig.1) contains the rotation engine 1 to the transmission mechanism containing the shaft 2, the threaded screw 3, the nut 4.

The threaded screw 3 is mounted on the shaft 2 nesosna and freely rotating, for example, on the bearing. On the threaded screw nut 3 is 4, coaxially with the shaft 2. The diameter of the nut thread 4 is larger than the diameter of the thread of the screw 3 in the amount of twice the eccentricity between the axis of the screw 3 and the shaft 2, and the steps of their threads are equal.

The actuator may include a slide 5, located within the nut 4, planetary gearing including a gear wheel (satellite) 6, is rigidly and coaxially connected with a threaded screw 3, which is, thus, a planet carrier, and a Central gear wheel 7, is rigidly connected to the slide 5 and coaxially with the shaft 2.

The actuator may include a mechanism for manual rotation of the shaft 2, is required when stopping the engine, for example the failure, power cut, etc., For its connection with the shaft 2 of the transmission mechanism on the shaft 2 has a coupling comprising two coupling Cam mating end surfaces. One of the coupling sleeve 9 is made rigidly mounted on the shaft 2 of the transmission mechanism. The other coupling half 10 is made from covering its outer teeth and the possibility of the melting of the transmission 11. Since the coupling 10 is arranged to move in the axial direction, it is possible to ensure that when the engine is restarted its way out of the gear mechanism 8 manual rotation of the shaft 2.

So when its axial movement of the coupling 10 is not released from engagement with the coupling 9, the device includes a limiter 12 of its axial movement.

In addition, the actuator may include a housing 13. The length of the body 13 is at least one through channel 14. The channel 14 may be located, for example, in the housing wall 13 or in the gap between the nut 4 and the housing 13, or anywhere else along the length of the housing 13. The channel 14 has an outlet 15 into the internal cavity of the housing 13 and the outlet 16 on the moving elements of the transfer mechanism.

The device operates as follows.

Include engine speed 1, which imparts a motion to the shaft 2 of the transmission mechanism. The threaded screw 3 (or more threaded screws 3) together with the shaft 2, on which it is installed on the bearing with the possibility of free rotation and nesosna, comes into rotation and moves the threaded nut 4, coaxially with the shaft 2. Because the diameter D (Fig.2) thread the nut 4 is larger than the diameter d of the thread of the screw 3 by the value of the double eccentricity IU the at the top of the thread profile of the screw 3 more angle2at the top of the thread profile of the nut 4, and the circumferential length l1helical thread of the screw 3 is less than the circumferential length l2helices of the nut thread 4 (l1and l2in Fig.2 shown in the scan).

When the rotation of the screw 3 in one of its turnover is moved in the axial direction is not on the step size, as in the traditional transmission screw-nut, and many times less value of X, provides high accuracy approach the valve seat of the valve which is equal to the height of rise of the helix of the nut thread 4 on the phase differencedistrict of length l1and l2the helical lines of the threads of the screw 3 and nut 4, respectively (Fig.2). This value is calculated by the formula:

where X is the axial displacement of the screw 3 in one of its turnover on the nut 4,

S - the value of the thread pitch, the same screw 3 and nut 4,

D - diameter of the nut thread 4,

d is the diameter of the thread of the screw 3.

Screw the screw flights 3 does not slide on one of the nuts 4, and roll on them, which greatly reduces the friction between the parts of the transmission, and therefore increases its efficiency (0,9-0,95) compared with the traditional transmission of the screw-nut that allows you to reduce the size of the transfer movement of rolling on the nut 4 on the slide and, therefore, the transformation of this transfer in the traditional transmission of the screw-nut, such as jamming of the bearing screw screw 3, the device may be provided with a slide 5 and the planetary gear that works as follows. The threaded screw 3 rotates gear wheel (satellite) 6, is rigidly and coaxially connected with him. Gear (satellite) 6 is moved from its axis relative to the Central gear 7 with the screw by the screw 3. The Central gear wheel 7, is rigidly connected to the slide 5 and coaxially with the shaft 2, passes forward motion of the slide 5, unable mutual rotation relative to the nut 4.

If the device mechanism 8 manual rotation of the shaft 2, it works as follows. The engine 1 is not operating. The coupling 10 with covering its outer teeth move, for example, a lever mechanism in the axial direction to connect with the gear 11, which in turn is connected with the mechanism 8 manual rotation of the shaft 2. Rotating manually the mechanism 8, for example by using a flywheel, motion passed from him to the gear 11, and then the coupling 10. The coupling 10 is associated with its Cam end surface with a Cam face 10 interact, and the motion is transmitted to the shaft 2 of the transmission mechanism.

When the engine is restarted 1 Cam coupling 9 affects the coupling 10 so that it moves freely in the axial direction and out of gear between it and the gear 11, and hence the mechanism 8 manual rotation of the shaft 2. This design eliminates injuries when working mechanism 8 manual movement of the shaft 2 in the event of a sudden the engine starts.

To prevent disengagement of the coupling 9 and 10 in the event of axial movement of the coupling 10 includes a limiter 12 of its axial movement, which can be performed, for example, in the form of a ledge, flange, protrusion, groove, finger, etc., on the shaft 2, which interacts with the end surface of the coupling 10 or with a special lip on its outer surface.

If movable in the axial direction is the lower half-coupling, the limiter 12 set below it, if the top - the top of it.

Cams mating end faces of the coupling halves 9 and 10 can be any of: triangular, trapezoidal, wave, curved, etc., but in any case, they should ensure the engagement of the coupling halves 9 and 10 and free axial movement of the coupling is liveout required quantity of liquid lubricant, and the device works as follows. When the threaded screw 3 (or threaded screw 3, together with the slide 5) is lowered into the lower part of the housing 13, it is underneath the free volume decreases, the liquid lubricant is forced out the outlet 15 of the channel 14 at the base of the housing 13, is raised on the cross channel 14, through the outlet 16 of the channel 14 falls on the moving elements of the transfer mechanism, and then flows, for example, a spiral groove of the nut 4 in the lower part of the housing 13.

Using the proposed device, the rotary motion of the motor shaft immediately turns into a slow translational movement of the valve without gear mechanism (gear). The actuator has a high efficiency (0,9-0,95), because his gear is based on the principle of rolling a pair of screw-nut. The ability to automatically disconnect mechanism manual shaft rotation transmission mechanism when the engine is restarted rotation makes the device safe. A system of continuous lubrication simplifies maintenance and prolongs its service life. The device's small size (diameter 90 mm, height 190 mm) and weight (7.5 kg). It does not require for its production of complex technological equipment.

Sources of information

1. P is

1. Drive pipeline valves, including engine speed to the transmission mechanism, wherein the gear mechanism includes a shaft on which nesosna has at least one freely rotating on the shaft of the threaded screw in a pair with a nut coaxially with the shaft, the threads of which diameter is larger than the diameter of the thread of the screw on the value of twice the eccentricity between the axis of the screw and shaft, and pitch equal to the pitch.

2. Drive under item 1, characterized in that it may contain a slider located within the nut, planetary gearing including a gear wheel (satellite), rigidly and coaxially connected with a threaded screw (planet carrier), and the Central gear wheel rigidly connected with the slide and coaxially with the shaft.

3. The actuator according to any one of paragraphs.1 and 2, characterized in that it contains a mechanism for manual rotation of the shaft, mounted on a shaft coupling comprising two coupling Cam mating end surfaces, with one of the coupling halves is made rigidly mounted on the shaft, and the other with covering its outer teeth and the possibility of axial movement, a gear transmission mechanism between manual rotation of the shaft and the coupling with external teeth, the stopper axially the second half.

4. The actuator according to any one of paragraphs.1-3, characterized in that it includes a housing, the length of which is at least one through channel having access to the inner cavity of the housing at its base and output over the moving elements of the transfer mechanism.

 

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