Rotary actuator

A technology of rotary actuators and rotary valves, applied to engine components, fluid pressure actuators, mechanical equipment, etc., to achieve the effect of number of parts, smooth action, and simple structure

Active Publication Date: 2007-12-19
巴阀门株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the cylinder body is usually made by die-casting and cannot be an extruded product

Method used

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Embodiment approach

[0130]The best mode for carrying out the present invention will be described in detail below. The present invention relates to a valve stem driving device of a rotary valve having a rotating valve body such as a butterfly valve, that is, a rotary actuator, which has a structure in which an output shaft is connected to a piston reciprocating in a cylinder under the pressure of a pressurized fluid through a yoke. Above, the reciprocating motion of the piston is converted into a rotary motion to drive the rotary output shaft, thereby driving the valve stem of the rotary valve connected with the output shaft. A piston that moves in the cylinder body under fluid pressure such as air pressure, a disc-shaped piston portion that is in sliding contact with the inner surface of the cylinder body and a front end portion of the piston rod that extends axially from the piston are equipped with a slide that is in sliding contact with the inner surface of the cylinder. The two sliders are ar...

Embodiment

[0148] The present invention relates to a rotary actuator. According to the embodiments described in the drawings, the object is butterfly valves, but it is not limited to driving butterfly valves. As an actuator with a rotating valve stem, the valve can be opened and closed by driving and rotating the valve stem from the outside. Rotary actuators for so-called rotary valves can be used for a wide variety of valves. Referring to Figures 1 to 6, the rotary actuator has a cylinder (1); a piston (2) that reciprocates in the cylinder (1) under the pressure of the pressurized fluid; and a piston (2) that converts the reciprocating motion of the piston (2) into rotational motion The stop yoke (3), which transmits the rotational movement of the stop yoke (3) to the output shaft (4) of the valve stem, reciprocates the piston (2) by controlling the direction of the pressure fluid applied to the piston with the required control device Movement, the output shaft (4) is rotated by the rec...

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PUM

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Abstract

Conventional coming-out of a trunnion pin is prevented to assure stable and smooth movement of a piston. Further, a rotary actuator, a rotary valve, and a connection structure that correspond to a cylinder output and a valve bore diameter are appropriately selectable, the number of parts is reduced, and a cylinder body is shaped so as to have the same cross-sectional shape in its axial direction. Coming-out of a trunnion pin is effectively prevented by a simple structure, a rotary actuator and a rotary valve are connected via an intermediate part, torque is received by the intermediate part, an opening adjustment means is incorporated to simplify the structure of the rotary actuator, and the intermediate part is made replaceable. Further, an indicator section for displaying the degree of opening of the rotary actuator is made to take thrust force occurring when an output is produced. In addition, open side and closed side air passages communicating an air passage are arranged in a side cover.

Description

technical field [0001] The present invention relates to a rotary actuator for a valve stem of a rotary valve that is rotationally driven to open and close a valve body such as a butterfly valve, and more particularly to a rotary actuator that attempts to realize stable reciprocating motion of a piston and prevent pulling out of a trunnion pin. The connection device, especially the connection device of the rotary valve of the rotary actuator that makes the intermediate part interposed between the rotary valve and the rotary actuator in an attempt to realize the connection between the two, makes the indicating part that displays the opening degree of the rotary actuator The axial force generated when the load is output, the opening degree display device that aims to reduce the number of parts, and the cylinder that drives the rotary actuator that rotates the valve stem of the rotary valve that performs the valve body opening and closing operations such as butterfly valves. The s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/06F15B15/14F16K37/00
CPCF15B15/065
Inventor 河合竜弥
Owner 巴阀门株式会社
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