Spring-return valve actuator using planetary gear train

Abstract

The invention provides a spring-return valve actuator using a planetary gear train. The spring-return valve actuator comprises a revolving shaft of a motor, a primary worm wheel and worm set, a secondary worm wheel and worm set, a sun wheel, the planetary gear train, a planetary gear train support, a power spring shaft, a brake unit, a shiftable worm and a hand wheel mechanism. The primary worm wheel and worm set is connected with the revolving shaft and composed of a primary worm and a primary worm wheel. The secondary worm wheel and worm set is composed of a secondary worm and a secondary worm wheel, wherein the secondary worm is coaxial with a primary worm wheel shaft, and the secondary worm wheel corresponds to the secondary worm. The sun wheel is coaxial with the secondary worm wheel, and the planetary gear train is composed of the sun wheel, a planetary gear and a gear ring. The planetary gear train support is in linkage with the planetary gear train and provided with an output shaft on the lower portion. The power spring shaft is connected with the output shaft and provided with a limiting device and a power spring. The brake unit comprises a spragging gear and has a brake function, wherein the spragging gear is meshed with external teeth of the gear ring. The shiftable worm can be in linkage with a revolving eccentric wheel and be meshed with and separated from the external teeth of the gear ring. The hand wheel mechanism is connected to the other end of the shiftable worm through a pin and can provide revolving power.

Description

technical field [0001] The present invention relates to a spring return type valve actuator for realizing valve opening and closing by utilizing a planetary gear mechanism. It is powered by a motor, passes through a two-stage worm gear set, and transmits the power to the planetary gear mechanism, and through the planetary gear mechanism bracket and output shaft, transmits the power to the clockwork spring shaft, and finally transmits the power to the clockwork spring shaft through the clockwork spring shaft. On the valve, realize the opening or closing action of the valve. It also has a brake unit, which controls the mainspring spring by controlling the rotation of the ring gear of the planetary gear mechanism. When the power supply is cut off in an abnormal state, the braking unit is separated from the ring gear of the planetary gear mechanism, so that the pre-tightening force of the clockwork spring is released, and through the clockwork spring shaft, the valve is realized ...

AI Technical Summary

Problems solved by technology

[0007] However, in this patent, since there are two planetary gear mechanisms aligned axially at the same time, the length of the entire valve actuator becomes longer, the volume increases, and the number of parts also increases greatly, which also become The main reason for the increase in manufacturing cost

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