Electromagnetic Valve Drive Rod Grooves for Faster Pressure Response
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Solution Overview
Problem
The existing capacity control valve in air conditioning systems experiences poor responsiveness due to a small gap between the movable iron core and sleeve, leading to delayed fluid pressure changes and increased costs and complexity in manufacturing, especially when handling large pressure changes in variable displacement compressors.
Innovation Solution
The electromagnetic valve design includes a drive rod with a guide portion and a groove portion that faces the inner peripheral surface of the fixed iron core, allowing for sufficient fluid flow between the valve housing and movable iron core, reducing pressure differences and improving responsiveness, while maintaining high accuracy and processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a small gap is formed between the drive rod and fixed iron core to enable accurate reciprocating operation, then manufacturing precision is improved, but fluid flow speed deteriorates causing poor responsiveness
Solution Approach 1:
The drive rod is segmented with multiple groove portions that divide the fluid passage into multiple channels. This segmentation allows fluid to flow through multiple parallel paths simultaneously, increasing the overall flow rate while maintaining the small gap between the drive rod and fixed iron core for accurate reciprocating operation.
Solution Approach 2:
The groove portions extend in the axial direction of the drive rod, creating a three-dimensional fluid passage structure. This axial extension provides an additional dimension for fluid flow, allowing rapid pressure equalization between the valve housing and movable iron core spaces without compromising the radial gap precision.
2Speed
If a slit-groove is provided in the movable iron core to enable prompt fluid movement, then responsiveness is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
Instead of providing grooves in the movable iron core as in conventional designs, the grooves are inverted and provided in the drive rod, which is a different component in the same assembly. This inversion achieves the same fluid communication function while simplifying the movable iron core structure and reducing manufacturing complexity.
Solution Approach 2:
The drive rod acts as an intermediary component that facilitates fluid communication between the valve housing and movable iron core spaces. By placing the grooves in the drive rod rather than the movable iron core, the system uses an intermediate structure to achieve rapid fluid movement without complicating the core moving部件.
3Manufacturing precision
If a small gap is maintained between drive rod and fixed iron core, then manufacturing precision is improved, but fluid flow capability deteriorates leading to delayed pressure response
Solution Approach 1:
The fluid passage is segmented into multiple channels through the groove portions in the drive rod. This segmentation allows fluid to flow through multiple parallel paths simultaneously, significantly increasing the effective flow area and pressure response speed while maintaining the small gap for precise manufacturing and accurate reciprocating operation.
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 enhances the electromagnetic valve's responsiveness to fluid pressure changes, ensures accurate reciprocating operation, and reduces manufacturing costs by allowing fluid to flow quickly and efficiently, maintaining performance even under large pressure changes.
Implementation Method 1
a coil which applies an electromagnetic drive force to the movable iron core
Implementation Method 2
a slight gap is formed between the drive rod and the fixed iron core and the fluid on the side of the valve housing flows into the movable iron core inside the sleeve through the gap
Data Source
AI summary
An electromagnetic valve has a valve housing; a valve body disposed inside the valve housing and movable in a reciprocating manner; an urging member configured to urge the valve body in one direction; and a drive device which is connected to the valve housing and applies a drive force to the valve body. A drive rod of the drive device includes a guide portion which faces an inner peripheral surface of a fixed iron core such that a movement of the drive rod is guided in an axial direction and a groove portion which is recessed in an inward radial direction from the guide portion and the groove portion is continuously formed from an inside of the valve housing to an inside of a movable iron core.