Electronic Expansion Valve Structure for Compact Pressure Balancing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing electronic expansion valves have complex connection structures between the valve head and screw rod, leading to high manufacturing costs and large size, which hinders miniaturization due to the need for maintaining strength and service life.
Innovation Solution
The design includes a valve body with a valve head and guide sleeve, a driving portion with a rod and valve sleeve, and an elastic member to simplify the structure, reduce lengths, and form a balancing channel for pressure balance, along with a sealing member to enhance sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection structure between valve head and screw rod is made complex to ensure strength and service life, then the reliability is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent integrates the valve head and screw rod into a unified structure where the valve head is directly formed on the screw rod, eliminating the need for separate connection components. This merging reduces structural complexity while maintaining strength through the integrated design, directly resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The screw rod serves multiple functions simultaneously: it acts as both the driving mechanism and the structural support for the valve head. This multi-functionality reduces the number of components needed while ensuring the structural integrity required for reliable operation, thereby reducing complexity without compromising service life.
2Reliability
If the valve head and screw rod are made longer to guarantee strength and service life, then the reliability is improved, but the length of moving object increases, preventing miniaturization
Solution Approach 1:
The patent optimizes the geometric parameters of the integrated valve head and screw rod structure, including diameter ratios, wall thickness distributions, and profile configurations. These parameter changes allow the component to achieve required strength and service life with reduced axial length, enabling miniaturization while maintaining reliability.
Solution Approach 2:
Instead of increasing length to achieve strength, the patent employs dimensional optimization in radial and cross-sectional dimensions. The valve head and screw rod are designed with optimized radial thickness and cross-sectional area distributions, transferring the strength requirement from the length dimension to the cross-sectional dimension, thereby enabling compact axial size while maintaining structural integrity.
3Length of moving object
If the valve head and screw rod are made thinner and slimmer to achieve miniaturization, then the length of moving object is reduced, but the strength and service life are compromised
Solution Approach 1:
The patent employs optimized parameter combinations including increased radial wall thickness of the valve head, optimized screw rod diameter, and strengthened transition zone geometry. These parameter changes compensate for the reduced axial length, ensuring that the thinner and slimmer design maintains sufficient strength and service life for reliable 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 solution simplifies the machining process, reduces manufacturing costs, and achieves miniaturization by reducing the axial size of the driving portion and overall length, while improving sealing performance and preventing internal leakage.
Implementation Method 1
an elastic member, provided in the accommodating cavity, one end of the elastic member being cooperated with the bottom wall, and the other end of the elastic member being able to be compressed by the end of the driving portion
Data Source
AI summary
Some embodiments of the present disclosure provide an electronic expansion valve, including: a valve body, the valve body having a valve port; a valve head portion, movably provided in the valve body, the valve head portion including a valve head and a pressing sleeve, the valve head having an accommodating cavity, the end of the accommodating cavity close to the valve port having a bottom wall, a through hole being provided on the bottom wall, and the valve head being used for blocking the valve port; a guide sleeve, provided in the valve body, the valve head portion being inserted in the guide sleeve; a driving portion, movably provided in the valve body, an end of the driving portion penetrating the pressing sleeve, and a channel being provided on the end of the driving portion.