Electronic Expansion Valve Sleeve Structure for Leak-Resistant Flow Control
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Solution Overview
Problem
Conventional electronic expansion valves suffer from internal leakage and reduced system efficiency due to eccentricity of the valve core seat caused by high-pressure refrigerant flow, and inadequate sensitivity in opening the main valve port when refrigerant flows reversely.
Innovation Solution
The electronic expansion valve design incorporates a sleeve fixed in the main valve cavity, with a valve core seat axially movable within the sleeve, and a dual communicating hole system that disconnects when the valve core seat closes the main valve port, reducing pressure impact on the valve core seat and enhancing sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the valve core seat is directly exposed to high-pressure refrigerant flow, then the refrigerant can flow through the main valve port, but the valve core seat becomes eccentric and causes internal leakage
Solution Approach 1:
A guide sleeve is introduced as an intermediary component between the high-pressure refrigerant and the valve core seat. The guide sleeve receives the high-pressure refrigerant and guides it to uniformly act on the valve core seat, preventing direct asymmetric impact that causes eccentricity. This mediator structure ensures both refrigerant flow and valve core seat concentricity are maintained.
2Adaptability or versatility
If the electronic expansion valve is placed far from the evaporator, then installation flexibility is improved, but heat loss increases and evaporator utilization rate decreases
Solution Approach 1:
The one-way valve function is extracted from a separate component and integrated into the electronic expansion valve structure itself. This allows the electronic expansion valve to perform both expansion regulation and one-way flow control functions, enabling optimal placement near the evaporator to reduce heat loss while maintaining installation flexibility through the integrated design.
3Adaptability or versatility
If the electronic expansion valve is placed far from the evaporator, then installation flexibility is improved, but the liquid refrigerant gasifies and reduces system efficiency
Solution Approach 1:
The one-way valve function is extracted and integrated into the electronic expansion valve, allowing it to be positioned optimally near the evaporator. This integration enables the valve to maintain liquid refrigerant integrity through proper positioning while preserving installation flexibility through the combined functional design.
4Productivity
If the valve core seat is subjected to asymmetric high-pressure impact, then refrigerant flow is maintained, but the valve core seat becomes eccentric causing internal leakage
Solution Approach 1:
The guide sleeve acts as a mediator that receives high-pressure refrigerant and distributes it uniformly across the valve core seat. This intermediary structure transforms the asymmetric impact into uniform pressure distribution, maintaining refrigerant flow while preserving valve core seat concentricity and preventing internal leakage.
Solution Approach 2:
The guide sleeve creates a localized controlled environment around the valve core seat, ensuring uniform pressure distribution only at the critical sealing interface. This local quality control maintains concentricity where needed while allowing high-pressure flow elsewhere in the system.
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 prevents eccentricity and internal leakage, ensuring reliable operation by reducing the impact of high-pressure refrigerant on the valve core seat and improving the sensitivity of the main valve port opening, thus enhancing system efficiency.
Implementation Method 1
When a fluid medium flows reversely from the vertical connecting pipe to the transverse connecting pipe, the valve core seat opens the main valve port under the action of a pressure difference of the fluid medium
Implementation Method 2
a first communicating hole close to the main valve port and a second communicating hole away from the main valve port; and in a case that a fluid medium flows from the transverse connecting pipe to the vertical connecting pipe, the valve core seat closes the main valve port, a communication between the first communicating hole and the main valve port is disconnected
Data Source
AI summary
An electronic expansion valve is provided, which includes a main valve cavity. A sleeve is fixed in the main valve cavity. A lower end part of the sleeve is supported by a valve seat, and the lower end part of the sleeve surrounds a main valve port. A valve core seat is axially movably arranged in the sleeve. A lower part of the valve needle component extends into the sleeve to open and close the valve core valve port. A circumferential side wall of the sleeve is provided with a first communicating hole close to the main valve port and a second communicating hole away from the main valve port. The structural design of the electronic expansion valve may prevent an excessive impact on a valve core seat caused by the refrigerant with high pressure when the refrigerant flows forward, thereby preventing the eccentricity of the valve core seat.