Linear Actuator Rotary Output for Valve Position Feedback
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Solution Overview
Problem
Industrial linear valves, which require precise control, are often inadequately served by existing sensors and position indicators due to their linear operation, leading to less accurate, less reliable, and more complex or expensive control processes, as most available instruments are designed for rotary inputs.
Innovation Solution
A linear actuator with a rotary output mechanism that converts axial piston movement into rotational displacement, allowing for direct engagement with conventional rotary instruments, such as Namur type sensors, to provide visual and electrical signals indicative of the valve's position, thereby facilitating accurate position feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If linear actuators are used to control linear valves, then the actuation is efficient and effective, but conventional rotary sensors and position indicators cannot be used directly, rendering control less accurate, less reliable, and more complex
Solution Approach 1:
A rotary output mechanism is introduced as an intermediary component between the linear actuator and conventional rotary instruments. This mechanism includes a rotary output element that converts linear piston movement into rotational displacement, enabling compatibility with standard rotary sensors and position indicators without modifying them
Solution Approach 2:
The rotary output mechanism transforms the motion parameter from linear displacement to rotational displacement. By changing the type of mechanical motion, the system can utilize conventional rotary instruments designed for rotational inputs, thereby improving reliability while maintaining simplicity
2Adaptability or versatility
If rotary output mechanism is added to linear actuator, then compatibility with conventional rotary instruments is achieved, but device complexity increases
Solution Approach 1:
The rotary output mechanism is designed to provide universal compatibility with conventional rotary instruments such as Namur type sensors and position indicators. By creating a standardized rotary output interface, the actuator can work with a wide range of existing instruments, achieving multi-functionality and broad adaptability
Solution Approach 2:
The rotary output mechanism is integrated within the actuator structure, with the rotary output element nested within the actuator housing. This compact arrangement minimizes external complexity while maintaining the conversion function, allowing the additional functionality to be incorporated without proportionally increasing overall device complexity
3Ease of operation
If rotary instruments are mounted on top of cylinder, then visual indication is provided, but access and visual inspection become difficult and potentially dangerous in installations behind guard rails or safety screens
Solution Approach 1:
The rotary output element extends transversely from the cylinder, changing the spatial dimension of the output interface from a vertical top-mounted position to a horizontal side-extending position. This dimensional change allows instruments to be mounted on the side of the actuator, making them accessible from ground level while maintaining visual indication capabilities
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables precise and reliable position indication and control of linear valves, improving operational safety and reducing complexity and costs by integrating with existing rotary instrumentation, making it accessible and visible for maintenance and inspection.
Implementation Method 1
a rotary output mechanism (15) including a rotary output element, preferably in the form of an output drive spindle (18), extending generally transversely from the cylinder (2), through a hub or boss (20), for rotation about a rotary output axis generally normal to the cylinder axis
Data Source
AI summary
This invention provides a linear actuator with a cylinder defining a cylinder axis. A piston is movable within the cylinder along the cylinder axis, and a piston rod extends axially from the piston for connection to a mechanism whereby in use, movement of the piston actuates the mechanism. A rotary output mechanism includes a rotary output element extending generally transversely from the cylinder and supported for rotation about an output axis generally normal to the cylinder axis. The rotary output mechanism is responsive to movement of the piston, and the rotary output element is adapted for operative engagement with an instrument mounted to the cylinder such that axial movement of the piston effects a corresponding rotational displacement of the rotary output element, whereby in use the instrument provides an output signal indicative of the position of the piston within the cylinder.