Speed reducing device of valve intelligent executer

Abstract

The invention relates to a speed reducing device of a valve intelligent executer. The device comprises a box body, a two-grade planet gear speed reducing mechanism arranged in the box body, and a wormand gear mechanism; a sun gear of a star gear speed reducing mechanism is used for connecting with a motor output shaft; each first-grade planet gear is connected to a sun gear planet carrier by a first-grade planet gear pin; the sun gear planet carrier is rotationally mounted on a worm gear ring and a planet carrier; a first-grade gear ring is fixed on the box body; the sun gear drives each first-grade planet gear to rotate along the first-grade gear ring; each second-grade planet gear is mounted on the planet carrier through a second-grade planet gear pin; the planet carrier is rotationallymounted on an output gear ring and the sun gear planet carrier; the sun gear planet carrier is engaged with each second-grade planet gear; the tooth number of the output gear ring is higher than thetooth number of the worm gear ring; and the second-grade planet gear is synchronously engaged with the output gear ring and the worm gear ring to form small-tooth-difference speed reducing transmission. The device is compact in transmission, high in transmission ratio and high in bearing torque, can realize manual and electric switching without needing a clutch, and is convenient to maintain.

Description

technical field [0001] The invention relates to a deceleration device of a valve intelligent actuator, belonging to the technical field of valve actuators. Background technique [0002] The valve actuator is used to start and close the valve, and the planetary reducer is an important part of the valve actuator. The principle of the planetary reducer is to use the planetary gear mechanism to realize the reduction transmission. The planetary gear mechanism usually includes sun gear, planetary gear, planet carrier and ring gear, etc. The planetary gear mechanism of the existing planetary reducer uses the sun gear as the driving part and the planet carrier as the passive part, so as to realize the transmission of power. At present, a planetary reducer structure adopts a combination of one-stage gear reduction, one-stage planetary reduction and worm gear. On the one hand, the transmission ratio of the combination of gear reduction and one-stage planetary reduction is not high, a...

AI Technical Summary

Problems solved by technology

At present, a planetary reducer structure adopts a combination of one-stage gear reduction, one-stage planetary reduction and worm gear. On the one hand, the transmission ratio after the combination of gear reduction and one-stage planetary reduction is not high, and there is still a reduction in the place where large transmission power is required. The problem of large volume of the device is not conducive to small space installation

On the other hand, the power output worm gear and the output bushing are respectively connected with the planetary gear and the planetary carrier. Since the planetary gear and the planetary carrier are fixed, the worm gear and worm must be manually operated through an axial clutch. Damage to the reduction gear due to operation

Another structure of the planetary reducer structure is to use two-stage planetary reduction transmission. The planetary reducer of this structure uses the output shaft of the motor as the sun gear and meshes with the first-stage planetary gear. The first-stage planetary gear is connected to the end plate of the planet carrier and On the output shaft, the second-stage planetary gear is connected to the case cover and meshes with the output shaft, and the first-stage planetary gear and the second-stage planetary gear are meshed with a rotatable ring gear at the same time, so that the power transmitted by the input shaft is divided into two paths It is transmitted to the output shaft to reduce the load intensity of a single part in the reducer, but this kind of reducer also has a small transmission ratio and a small driving torque. The two-stage planetary gear transmission must cooperate with multiple parts such as the planetary carrier end plate and the case cover. , the structure is complex, the working noise is loud, and it does not have a manual operation function. When the motor is faulty or damaged, the valve cannot be operated

Furthermore, when the above two structures are faulty or damaged, it is very inconvenient to disassemble and assemble the motor, which is not conducive to later maintenance work.

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