Nut assembly for electronic expansion valve, electronic expansion valve, and limiting element mounting method
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Solution Overview
Problem
The existing nut assembly of electronic expansion valves experiences inaccurate positioning due to deformation of the elastic member when the check ring abuts against it, leading to unreliable backstop positioning.
Innovation Solution
A nut assembly design that includes a stop guide rail and a limiting element, where the limiting element is disposed on the nut base to prevent the stop guide rail from deforming, allowing the check ring to spirally rotate and providing accurate backstop positioning by limiting the movement of the stop guide rail along the axis of the nut base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the check ring abuts against the elastic member to realize backstop, then the backstop function is achieved, but the elastic member deforms causing inaccurate positioning
Solution Approach 1:
The backstop mechanism is segmented into two independent parts: the elastic member provides the backstop force while the stop guide rail provides the positioning reference. By separating the force-providing function from the positioning function, the deformation of the elastic member no longer affects positioning accuracy.
Solution Approach 2:
The stop guide rail acts as an intermediary between the check ring and the positioning reference. It guides the check ring during its movement and provides a stable reference that is not affected by the elastic member's deformation, thereby ensuring accurate positioning.
2Ease of operation
If the stop guide rail is allowed to move freely along the axis, then the check ring can spirally rotate, but the stop guide rail deforms causing positioning errors
Solution Approach 1:
The stop guide rail has different structural properties at different locations: the upper part allows free movement for check ring rotation, while the lower part is constrained by the limiting element to prevent deformation. This local differentiation enables both rotation and accurate positioning.
Solution Approach 2:
The limiting element is pre-installed on the nut base to constrain the stop guide rail before the check ring operates. This preliminary constraint prevents the stop guide rail from deforming during operation, ensuring positioning accuracy from the start.
3Reliability
If the elastic member is made more elastic to improve backstop responsiveness, then the backstop function improves, but the deformation increases causing less accurate positioning
Solution Approach 1:
The system is divided into the elastic member for providing backstop force and the stop guide rail for providing dimensional stability. The elastic member can be highly elastic without compromising the dimensional stability of the positioning reference.
Solution Approach 2:
The stop guide rail serves as an intermediary that transfers the backstop force from the elastic member to the check ring while maintaining dimensional stability. It decouples the elasticity requirement from the stability requirement.
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 positioning accuracy and reliability by preventing deformation of the stop guide rail, ensuring precise top and bottom backstops and improving the overall performance of the electronic expansion valve.
Implementation Method 1
the elastic member can deform easily due to elasticity of the elastic member
Data Source
AI summary
Disclosed is a nut assembly for an electronic expansion valve, an electronic expansion valve, and a limiting element mounting method. The nut assembly comprises a nut base, having a first end and a second end opposite to each other; a stop guide rail, sleeved on the nut base; a check ring, sleeved on the nut base and capable of helically rotating with respect to the nut base along the stop guide rail; and a limiting element, provided at the first end of the nut base The limiting element mounting method comprises the following steps: enabling the limiting element to be sleeved on the nut base, and enabling a second limiting boss to extend from a groove opening of a first limiting groove into the first limiting groove; and enabling, by means of the limiting element, the second limiting boss to slide into a corresponding second limiting groove.