Electronic expansion valve
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Solution Overview
Problem
Conventional electronic expansion valves face complications when refrigerant flows reversely, leading to complex control procedures and potential screw rod sticking due to unresolved valve needle components, resulting in friction and reduced system efficiency.
Innovation Solution
The electronic expansion valve design includes a screw rod position limiting portion and a valve needle position limiting portion with a predetermined buffer distance, allowing the valve core seat to open the main valve port smoothly without requiring the screw rod to move upward, and utilizing an elastic component to prevent friction and sticking, thus simplifying control and enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the valve needle component is not removed in advance when refrigerant flows reversely, then the control procedure becomes complex, but the screw rod may stick due to friction from the valve needle component
Solution Approach 1:
The patent applies preliminary action by providing a buffer distance between the screw rod and valve needle component before reverse flow occurs. This buffer distance is pre-established during forward flow operation, allowing the valve needle component to be pushed away from the screw rod in advance. When reverse flow occurs, the screw rod can move upward smoothly without the valve needle component obstructing its path, thus preventing sticking while avoiding complex control procedures.
2Reliability
If the screw rod moves upward to remove the valve needle component, then the valve needle component is cleared, but the control procedure becomes complex and time-consuming
Solution Approach 1:
The patent extracts the valve needle component removal action from the screw rod's movement. Instead of requiring the screw rod to actively move upward to remove the valve needle component, the design allows the valve needle component to be pushed away passively by refrigerant pressure during normal operation. The buffer distance separates the screw rod and valve needle component, extracting the clearance function from active screw rod movement and eliminating the need for complex control procedures.
3Device complexity
If the screw rod and valve needle component are in fixed contact, then the structure is simple, but friction causes the screw rod to stick during reverse flow operation
Solution Approach 1:
The patent applies segmentation by dividing the screw rod and valve needle component into separate movable elements with a buffer distance between them. This segmentation breaks the fixed contact relationship, allowing each component to move independently. The buffer distance creates a separation that prevents friction between the screw rod and valve needle component during reverse flow, while maintaining structural simplicity through the straightforward buffer distance design.
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 simplifies the control procedure and prevents screw rod sticking, allowing the valve core seat to open the main valve port smoothly, improving operational reliability and reducing friction-related issues, thereby enhancing system efficiency.
Implementation Method 1
an elastic component which is compressed is further provided between the screw rod and the valve needle component
Data Source
AI summary
An electronic expansion valve is provided, the valve needle component thereof is provided with an axial mounting hole, the screw rod position limiting portion is mounted at the bottom end of the screw rod and extends into the axial mounting hole, and the valve needle position limiting portion is mounted at an open end of the axial mounting hole; and a distance between the bottom end of the screw rod and a bottom wall of the axial mounting hole forms the predetermined buffer distance. When the refrigerant flows reversely, the structural design of the electronic expansion valve may, on one hand, simplify the control procedure, and on the other hand, avoid the problem that a screw rod is stuck because a valve needle component is not removed in time.