Compressor Discharge Valve Guidance for Backflow and Noise Control
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Solution Overview
Problem
Existing scroll compressors face challenges in preventing refrigerant backflow when operation is stopped, leading to instability and increased noise due to uncontrolled oblique motion of the discharge valve during upward and downward movement.
Innovation Solution
A valve unit with a discharge valve and guide pins is designed to restrict oblique motion by using through holes with specific contact points and radii differences, ensuring stable operation and noise reduction by guiding the discharge valve's movement through cylindrical guide pins with a hardness greater than the valve, and a valve stopper to control the closing time within 0.5 seconds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge valve is allowed to move freely upward and downward, then the refrigerant backflow prevention function is maintained, but the discharge valve experiences uncontrolled oblique motion causing instability and noise
Solution Approach 1:
Guide pins are introduced as intermediary components between the discharge valve and the compressor housing. These guide pins constrain the discharge valve to move only in the vertical direction along predetermined paths, eliminating uncontrolled oblique motion while preserving the valve's ability to open and close the discharge port for refrigerant backflow prevention
Solution Approach 2:
The guidance function is segmented into multiple guide pins distributed around the discharge valve. This segmentation provides multi-point constraint that effectively restricts oblique motion while allowing vertical movement, distributing the constraint forces across multiple contact points between the guide pins and the discharge valve
2Speed
If the discharge valve moves quickly to close the discharge port, then the response time is reduced, but the closing time cannot be controlled precisely leading to potential backflow
Solution Approach 1:
The guide pins are pre-positioned and the discharge valve is pre-aligned within the guide pin constraints before operation begins. This preliminary positioning ensures that when the discharge valve moves to close the port, it follows a predetermined vertical path along the guide pins, enabling precise control of the closing timing within 0.5 seconds while maintaining rapid response
Solution Approach 2:
The guide pins provide continuous physical feedback to the discharge valve during its movement. As the discharge valve moves upward and downward, the guide pins constrain its motion and provide tactile feedback that ensures the valve returns to the correct closed position, enabling precise timing control for preventing refrigerant backflow
Data Source
AI summary
Provided is a compressor including a valve unit including: at least two guide pins passing through a discharge valve; and through holes allowing the guide pins to pass therethrough to control oblique motion of the discharge valve with respect to a horizontal direction during up and down movement of the discharge valve. When the discharge valve obliquely moves up and down with respect to the horizontal direction, the guide pin comes into contact with at least two points of an inner circumferential surface of the through hole so that the oblique movement of the discharge valve is restricted, thereby improving the durability of the discharge valve and reducing noise during operation of the compression.