Electronic Expansion Valve Sleeve Structure Against Seat Eccentricity
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Solution Overview
Problem
Conventional electronic expansion valves suffer from internal leakage due to eccentricity of the valve core seat caused by high-pressure refrigerant flow, which affects system reliability and efficiency.
Innovation Solution
The design incorporates a sleeve within the main valve cavity to absorb pressure impacts, featuring a communicating hole system that disconnects pressure paths to prevent eccentricity and ensure sealing, with a nut and screw rod mechanism for flow regulation and one-way communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-pressure refrigerant flows directly through the valve core seat, then flow regulation is achieved, but the valve core seat becomes eccentric causing internal leakage
Solution Approach 1:
A guide sleeve is introduced as an intermediary component between the high-pressure refrigerant flow and the valve core seat. The guide sleeve absorbs and redirects the pressure impact, preventing direct force application to the valve core seat that would cause eccentricity. This mediator allows flow regulation to continue while protecting the sealing interface from harmful forces.
Solution Approach 2:
The harmful pressure impact is extracted and separated from the valve core seat through the guide sleeve structure. The guide sleeve captures the high-pressure refrigerant flow and redirects it through communicating holes, removing the detrimental lateral forces that cause valve core seat eccentricity while maintaining the necessary flow control function.
2Ease of operation
If the valve core seat is exposed to high-pressure refrigerant flow, then flow control is enabled, but pressure impact causes eccentricity and internal leakage
Solution Approach 1:
The guide sleeve serves as a protective intermediary that shields the valve core seat from high-pressure refrigerant impact. It provides a controlled pathway for refrigerant flow while absorbing and redistributing pressure forces, enabling flow control operation without exposing the valve core seat to harmful lateral pressure that would cause eccentricity.
Solution Approach 2:
The guide sleeve converts the harmful high-pressure impact into a beneficial controlled flow pattern. By providing communicating holes at specific positions, the high-pressure refrigerant is redirected to cool the valve components and drive flow regulation, while the pressure forces are channeled in a way that prevents eccentricity rather than causing it.
3Productivity
If refrigerant flows through the valve core seat, then throttling effect is achieved, but pressure reduction causes gasification and adverse throttling
Solution Approach 1:
The guide sleeve acts as an intermediary chamber that manages the throttling process. Refrigerant flows through the guide sleeve's communicating holes before reaching the valve core seat, allowing controlled pressure reduction and cooling. This intermediate step prevents sudden pressure drops that would cause gasification, maintaining proper refrigerant phase while achieving necessary throttling.
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 significantly reduces the impact of high-pressure refrigerant on the valve core seat, preventing eccentricity and internal leakage, thus enhancing system reliability and efficiency.
Implementation Method 1
a drive component, the drive component includes a screw rod and a nut which cooperates with the screw rod by screw threads
Implementation Method 2
The valve core seat moves downward under the action of a pressure difference of the refrigerant, thereby closing the main valve port
Implementation Method 3
an elastic component compressed in an axial direction between the locating plate and a nut stepped portion
Data Source
AI summary
An electronic expansion valve includes a drive component including a screw rod which reciprocates axially and a nut which cooperates with the screw rod by screw threads, and a lower end of the screw rod forms the valve needle component. A sleeve is fixed in the main valve cavity, an upper portion of the sleeve cooperates with the nut, and a lower end of the sleeve is supported by the valve seat and surrounds the main valve port. The valve core seat is axially movably arranged in the sleeve, and the lower end of the screw rod extends into the sleeve to open and close the valve core valve port. The structural design of the electronic expansion valve prevents 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.