Electronic expanding valve
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Solution Overview
Problem
Conventional electronic expansion valves face difficulties in assembly due to complex stop rod connections, high material costs, and reliability issues, primarily due to the need for a large radial magnet dimension.
Innovation Solution
The design integrates a stop rod and sliding ring, where the sliding ring extends to form a stop rod that passes through a stop hole in the magnet, simplifying assembly and eliminating the need for internal connections, reducing the magnet's radial dimension and material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stop rod is connected to the inner wall of the connecting seat and assembled inside the magnet, then the stop rod can limit the rotation scope of the sliding ring, but the assembly process becomes difficult and the assembly cost increases
Solution Approach 1:
The stop rod is extracted from the internal structure of the magnet and repositioned to extend from the outer surface of the magnet. This allows the stop rod to be assembled externally by engaging with the sliding ring, eliminating the need for complex internal assembly operations while maintaining its rotational limiting function.
2Reliability
If the extending portion of the sliding ring extends radially by enough length to cooperate with the stop rod, then the stop rod can effectively limit rotation, but the magnet requires a large radial dimension which increases material cost
Solution Approach 1:
The stop rod is repositioned to extend from the outer surface of the magnet rather than from the inner wall, changing the spatial arrangement from an internal radial extension to an external radial extension. This allows the sliding ring's extending portion to engage with the stop rod without requiring the magnet to have a large radial dimension, as the engagement occurs outside the magnet's main body.
3Reliability
If the stop rod is assembled inside the magnet with complex connections, then the rotation scope can be limited, but the assembly cost increases and the stop rod is apt to fall out after working for a period of time
Solution Approach 1:
The stop rod is extracted from the complex internal assembly structure and repositioned to engage with the sliding ring from the outside of the magnet. This simplifies the assembly process to a single engagement operation while improving reliability by eliminating multiple internal connection points that could fail over time.
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 reduces the number of components, simplifies assembly, enhances operational reliability, and minimizes the product size while saving material costs by eliminating the need for complex connections and large magnet dimensions.
Implementation Method 1
a rotatable magnet is arranged inside the housing, the magnet is fixedly connected to a screw rod
Implementation Method 2
the screw rod cooperates with a nut by screw threads
Data Source
AI summary
An electronic expansion valve is provided, a stop component thereof includes a spindle which is fixed with respect to the valve seat, a spring guide rail sleeved on the spindle, and a sliding ring configured to cooperate with the spring guide rail; one end of the sliding ring extends to form a stop rod, and a top of the magnet is provided with a stop hole, the stop rod passes through the stop hole, and when the sliding ring is at an upper limit position and a lower limit position, the stop rod remains in the stop hole. The structural design of the electronic expansion valve may reduce a number of components, simplify the assembly process of a stop rod, and improve the operational reliability of the stop rod, and reduce a radial dimension of a magnet, thereby saving the material cost and realizing the minimization of the product.