Hermetic Compressor Discharge Valve Segmentation for Response Speed
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Solution Overview
Problem
Hermetic reciprocating compressors with a single discharge valve face challenges in responsiveness due to increased stiffness, leading to compression loss, as the discharge valve's inertia is high, causing delays in opening and closing, which results in inefficient refrigerant discharge.
Innovation Solution
The design incorporates a discharge valve with multiple opening and closing portions radially extending from a single fixing portion, reducing the valve's inertia and improving responsiveness by evenly supporting the opening and closing operations, allowing for synchronized and quick valve action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single discharge valve is used to simplify the valve assembly structure, then the number of parts is reduced and assembly is simplified, but the discharge valve stiffness increases and inertia increases, leading to decreased responsiveness and compression loss
Solution Approach 1:
The single discharge valve is segmented into multiple opening and closing portions (first, second, third opening and closing portions) that radially extend from a common fixing portion. This segmentation reduces the inertia of each individual valve portion while maintaining the simplified single-valve assembly structure, thereby improving response speed without increasing device complexity
Solution Approach 2:
The opening and closing portions are arranged asymmetrically around the fixing portion at different radial positions and angles. This asymmetric arrangement optimizes the distribution of valve mass and reduces the moment of inertia, enabling faster response while maintaining structural simplicity
2Area of stationary object
If the discharge port is made wider to maintain discharge capacity with a single valve, then the valve installation space is improved, but the discharge valve stiffness must be increased, which increases inertia and reduces responsiveness
Solution Approach 1:
The discharge valve is divided into multiple lightweight opening and closing portions that can independently respond to pressure changes. This segmentation allows the valve to cover a wide discharge port area while each individual portion maintains low inertia and high responsiveness, eliminating the need to increase overall valve stiffness
3Speed
If the discharge valve inertia is reduced to improve responsiveness, then the response speed increases and compression loss decreases, but the valve structural stability may be compromised
Solution Approach 1:
Multiple opening and closing portions are merged at a common fixing portion that is securely mounted on the valve plate. This merging provides a stable anchor point that ensures structural stability while allowing each individual portion to be lightweight and responsive. The fixed portion acts as a rigid support that maintains overall valve stability despite the lightweight construction of the moving portions
Data Source
AI summary
A hermetic compressor equipped with a valve assembly may include a valve plate having one suction port and a plurality of discharge ports; a suction valve provided at a first surface of the valve plate; a discharge valve provided at a second surface of the valve plate and having one fixing portion and a plurality of opening and closing portions that extends from the one fixing portion to respectively open and close the plurality of discharge ports; and a valve stopper that is fixed to the valve plate and limits a degree of opening of the opening and closing portions of the discharge valve. Accordingly, the opening and closing portions of the discharge valve may be reduced in size to thereby reduce inertia of the discharge valve. Thus, response of the discharge valve may be increased while simplifying a structure and assembly of the discharge valve.