Pneumatic Valve Positioner Layout for Contamination Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional positioners face issues with dirt accumulation leading to damage or malfunctions, high space requirements, and leakage risks when using flammable and corrosive pneumatic media, particularly in explosive environments.
Innovation Solution
A positioner design that separates electronic and pneumatic components into distinct compartments within a housing, using a support body to create pressure-tight divisions, and encapsulates circuit boards with potting compound to protect electronics from contamination and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic components are arranged spaced apart from the current-to-pressure converter and individually encapsulated in different spaces, then the positioner can protect electronics from contamination, but the space requirement and device complexity increase significantly
Solution Approach 1:
The patent merges the electronics compartment and converter compartment into a single housing space, eliminating the need for separate encapsulation of individual components. The circuit board is mounted on a support body that integrates both compartments within the same housing, reducing the number of feedthroughs and simplifying assembly while maintaining protection against contamination.
2Reliability
If multiple separate compartments are used for electronic and pneumatic components, then protection against contamination is improved, but the overall volume and area requirements increase
Solution Approach 1:
The patent implements a nested compartment structure where the electronics compartment and converter compartment are arranged one above the other within the same housing volume. The support body with circuit board is positioned in the electronics compartment, while the converter is in the converter compartment, allowing vertical stacking that reduces overall housing volume while maintaining separation for contamination protection.
3Reliability
If conventional positioners with separate encapsulated components are used, then component protection is achieved, but manufacturing cost and assembly effort increase
Solution Approach 1:
The patent segments the positioner into modular components: a housing, a support body with integrated circuit board mounting, and a converter compartment. This segmentation allows for simplified assembly where components can be pre-assembled on the support body and then integrated into the housing, reducing overall assembly effort and manufacturing cost while maintaining protection.
Data Source
AI summary
A positioner for a pneumatic actuator for operating a control element, such as a control valve, in a process engineering system, is described. The positioner may include an electropneumatic converter, such as a current-to-pressure converter, a circuit board comprising supply electronics for operating the electropneumatic converter, and a housing surrounding an interior space. A support body that may be inserted into the interior space is may be provided, to which the circuit board may be attached. The housing and the carrier are coordinated with each other to pneumatically subdivide the interior space into an electronics compartment for accommodating at least one electrical and/or electronic component, such as the supply electronics, and a converter compartment for accommodating the electro-pneumatic converter.