POSITIONER

摘要

A positioner includes: an explosion proof container containing, in an interior space, an electric circuit module and an electropneumatic converter converting, into pneumatic signals, electric signals processed by the electric circuit module; and a pneumatic amplifier, provided outside of the explosion proof container, amplifying the pneumatic signal converted by the electropneumatic converter. The explosion proof container is formed with air flow paths for the air fed into the pneumatic amplifier and the air fed out of the pneumatic amplifier, in a thick portion between inner and outer wall faces of the container that encompasses the surrounding of the interior space. The air flow paths are formed along an inner wall face of the explosion proof container. The inner wall face of the explosion proof container where on the air flow path is formed is arc-shaped or a shape that uses many curved faces of free curve shapes.

主权项

1. A positioner for driving a regulator valve by converting an inputted electric signal into a pneumatic signal, comprising:
an electric circuit module that processes electric signals; an electropneumatic converter that converts, into pneumatic signals, electric signals that have been processed by the electric circuit module; an explosion proof container that contains, in an interior space, the electric circuit module and the electropneumatic converter; and a pneumatic amplifier, provided outside of the explosion proof container, that amplifies the pneumatic signal converted by the electropneumatic converter, wherein: the explosion proof container is formed with air flow paths for the air that is fed into the pneumatic amplifier and the air that is fed out of the pneumatic amplifier, in a thick portion between an inner wall face and an outer wall face of the container that encompasses the surrounding of the interior space; the air flow paths are formed along an inner wall face of the explosion proof container; and the inner wall face of the explosion proof container where on the air flow path is formed is arc-shaped or a shape that uses many curved faces of free curve shapes.