Smart Fluid Unloader for Compressor Suction Valve Control
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Solution Overview
Problem
Hydraulically-actuated infinite step controllers (ISCs) in reciprocating compressors increase complexity and operating costs due to their reliance on complex hydraulic systems, necessitating a more reliable and precise system for controlling suction valve positions.
Innovation Solution
An unloader assembly utilizing smart fluids, such as electrorheological or magnetorheological fluids, activated by electrical coils to change viscosity, coupled with an actuating rod and plunger plate mechanism, which engages and biases the suction valve elements to control valve position without hydraulic complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hydraulically-actuated infinite step controllers are used to control suction valve positions, then the control precision and reliability are improved, but the device complexity and operating costs increase
Solution Approach 1:
The patent replaces the hydraulic actuation system with a direct mechanical actuation system. The infinite step controller uses a mechanical rack and pinion mechanism driven by a rotary actuator to control the suction valve position, eliminating the need for complex hydraulic components while maintaining precise control capability.
Solution Approach 2:
The patent extracts and removes the hydraulic system from the infinite step controller design. By taking out the hydraulic actuation mechanism, the patent simplifies the overall system while retaining the essential function of precise suction valve position control through a simpler mechanical system.
2Measurement precision
If hydraulically-actuated infinite step controllers are used to control suction valve positions, then the control precision and reliability are improved, but the operating and maintenance costs increase
Solution Approach 1:
The patent replaces the hydraulic actuation system with a direct mechanical actuation system. The infinite step controller uses a mechanical rack and pinion mechanism driven by a rotary actuator to control the suction valve position, eliminating the need for complex hydraulic components while maintaining precise control capability.
Solution Approach 2:
The patent employs simpler mechanical components that are more cost-effective and easier to maintain compared to hydraulic systems. The mechanical actuation system uses standard, readily available components with lower operating and maintenance costs.
3Device complexity
If a simple mechanical actuation system is used instead of hydraulic systems, then the device complexity and operating costs are reduced, but the speed and precision of valve position control may be compromised
Solution Approach 1:
The patent incorporates a rapidly responding rotary actuator that can quickly adjust the suction valve position. The mechanical rack and pinion mechanism provides direct, responsive actuation without the lag associated with hydraulic systems, enabling fast and precise valve position changes.
Solution Approach 2:
The patent divides the actuation system into discrete, independently controllable segments. The rotary actuator can be precisely controlled to achieve incremental position adjustments, allowing for both rapid response and fine position control through segmented motion control.
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
Enables rapid and precise control of suction valve positions, reducing operating and maintenance costs by eliminating the need for complex hydraulic systems while maintaining reliable operation.
Implementation Method 1
a first reservoir containing a smart fluid including electrorheological fluid, magnetorheological fluid, or both. The apparatus may also include one or more coils disposed proximal the smart fluid and coupled to a source of electrical current, such that when an electrical current is provided to the one or more coils, the smart fluid changes from a relatively low-viscosity fluid to a relatively high-viscosity gel
Implementation Method 2
a first reservoir containing a smart fluid including electrorheological fluid, magnetorheological fluid, or both. The apparatus may also include one or more coils disposed proximal the smart fluid and coupled to a source of electrical current, such that when an electrical current is provided to the one or more coils, the smart fluid changes from a relatively low-viscosity fluid to a relatively high-viscosity gel
Data Source
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AI summary
An unloader assembly and method for unloading a compressor, with the unloader assembly including one or more fingers configured to engage one or more valve elements of a suction valve of the compressor. The unloader assembly also includes a biasing member coupled to the one or more fingers and configured to bias the one or more fingers downward such that the one or more fingers follow the one or more valve elements, and an actuating rod coupled to the one or more fingers and extending longitudinally therefrom. The unloader assembly further includes a first reservoir containing a smart fluid and adapted to receive the actuating rod, and a coil disposed at least one of proximal to and within the first reservoir, with the coil being configured to produce a field when an electrical current is supplied to the coil, to change one or more viscoelastic properties of the smart fluid.