Capacity Control Valve Iron Core Geometry for Smooth Maximum Stroke
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Solution Overview
Problem
The existing capacity control valve structures face challenges in achieving smooth control and stable holding of the valve element at maximum stroke position due to issues with magnetic force distribution and axial thrust force, leading to difficulties in fine adjustment and increased size of the structure.
Innovation Solution
A capacity control valve design where one iron core has a projected portion in a tapered shape with a smaller distal end surface and the other in a recessed shape, allowing for a gradual increase in magnetic force and axial thrust force near the maximum stroke position, enabling smooth control and stable holding with a reduced overall structure size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If flat opposing surfaces orthogonal to axial direction are used, then axial thrust force is large, but magnetic force increases rapidly making fine adjustment difficult
Solution Approach 1:
The patent applies curvature by forming one opposing surface in a circular-conical shape and the other with complementary recess and projection features. This curved geometry causes the iron cores to tilt relative to each other during approach, gradually applying radial magnetic force components that prevent rapid axial force increase, enabling fine adjustment while maintaining sufficient axial thrust force.
2Ease of operation
If circular-conical opposing surfaces are used, then fine adjustment is enabled, but magnetic force becomes small requiring larger solenoid
Solution Approach 1:
The patent introduces asymmetry by adding a projection on one iron core and a corresponding recess on the other, creating an asymmetric fit between the circular-conical surfaces. This asymmetric geometry allows the cores to tilt during approach, gradually engaging the magnetic force and enabling fine adjustment while generating sufficient axial thrust force without requiring a larger solenoid.
3Ease of operation
If both iron cores are formed to be loosely fitted with recess and projection, then fine adjustment is improved, but device size increases
Solution Approach 1:
The patent applies local quality by forming the recess and projection features only in specific localized regions of the iron cores, rather than throughout the entire structure. This localized approach enables fine adjustment through the asymmetric fit while minimizing the overall device size and structural complexity.
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 design allows for smooth control of the valve element and stable holding at maximum stroke with enhanced axial thrust force, while maintaining a compact structure, effectively addressing the limitations of previous designs.
Implementation Method 1
a position of a valve element is changed by drawing a movable iron core to a fixed iron core with magnetic force generated in accordance with energization of an electromagnetic coil
Data Source
AI summary
In a capacity control valve, a position of a valve element is changed by drawing a movable iron core to a fixed iron core with magnetic force by energization of an electromagnetic coil. The iron core on one side includes a projected portion on the radially outer side, the iron core on the other side includes a projected portion on the radially inner side, and these projected portions are capable of being loosely fitted to each other when the movable iron core is drawn to the fixed iron core. The projected portion is formed to be smaller than an opposing surface of the iron core facing an effective magnetic force surface of a distal end of the projected portion and formed in a tapered shape.