Hermetic Compressor Suction Muffler Outlet Design
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Solution Overview
Problem
The conventional hermetic compressor's suction muffler design with a vertically bent communication pipe creates a dead water region, reducing the effective flow area of the suction hole and deteriorating volumetric efficiency due to refrigerant gas concentration on the downstream side.
Innovation Solution
The suction muffler outlet portion is positioned to cover a part of the suction hole, aligning with the center of the suction hole, and the communication pipe is arranged to extend vertically, ensuring refrigerant gas flows into the center of the suction hole, thereby increasing the effective area and improving volumetric efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication pipe has a vertically bent portion, then the suction muffler outlet portion can be positioned to cover the suction hole, but a dead water region is generated in the inner peripheral side of the bent portion, reducing the effective flow area and deteriorating volumetric efficiency
Solution Approach 1:
The communication pipe is divided into multiple sections with different orientations. The lower portion extends vertically to position the outlet over the suction hole center, while the upper portion extends horizontally to connect to the suction muffler body, eliminating the bent portion that caused dead water regions
Solution Approach 2:
Instead of bending the communication pipe vertically as in conventional designs, the patent inverts the configuration by extending the pipe horizontally from a vertically positioned outlet, reversing the traditional arrangement to eliminate flow dead zones
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 configuration enhances the effective area of the suction hole, leading to improved volumetric efficiency by about 2% compared to conventional designs, while maintaining low flow path resistance.
Implementation Method 1
suction muffler 41 reduces a noise generated by an intermittent suction of refrigerant gas 7
Implementation Method 2
since suction muffler 41 is formed by a resin having a low thermal conductivity, it prevents refrigerant gas 7 passing through the inside of suction muffler 41 from being heated
Data Source
AI summary
A compression element is provided with a block, a piston, a valve plate arranged in an opening end of a compression chamber and forming a suction hole, a suction valve, a suction muffler forming a sound absorbing space and provided with a communication pipe, and a cylinder head, the communication pipe has a suction muffler outlet portion communicated with the suction hole, is arranged in such a manner as to extend in a vertical direction with respect to a center line passing through the suction hole, and is arranged in such a manner that a part of the suction muffler outlet portion covers a part of the suction hole in the suction muffler outlet portion positioned in a downstream side of refrigerant gas flowing through the communication pipe, in the case of projection the suction muffler outlet portion in a direction of a center line.