Hermetic Compressor Piston Projection for Dead Volume Reduction
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Solution Overview
Problem
Conventional hermetic type compressors experience inefficiencies due to increased losses and refrigerant accumulation in the compression chamber and discharge port, leading to reduced refrigerating capacity and energy efficiency.
Innovation Solution
A hermetic type compressor design featuring a piston with a projection having a flat surface extending parallel to its reciprocating direction, which reduces dead volume and guides refrigerant gas flow directly to the discharge port, minimizing suction loss and re-expansion during the compression stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a projection is arranged at the distal end face of the piston to reduce dead volume, then the refrigerating capacity is improved, but the suction loss increases due to complicating behavior of refrigerant gas
Solution Approach 1:
The invention applies local quality by creating a flat surface at a specific location on the projection (the side facing the suction port) to modify local flow characteristics. This flat surface is positioned strategically to guide refrigerant flow without disrupting the overall dead volume reduction effect, thereby resolving the contradiction between reducing dead volume and minimizing suction loss.
Solution Approach 2:
The flat surface on the projection performs a preliminary action by guiding the refrigerant gas flow before it enters the suction port. This pre-guidance of flow prevents complicating behavior and reduces suction loss in advance, allowing the projection to maintain its dead volume reduction function without causing energy losses.
2Productivity
If the projection enters the discharge port to reduce dead volume, then compression efficiency is improved, but refrigerant gas cannot be completely flowed out leading to re-expansion loss
Solution Approach 1:
The flat surface is positioned on the projection at a specific location (side facing suction port) to create localized flow guidance. This local modification ensures that refrigerant gas flows smoothly past the projection during compression and discharge, preventing accumulation and subsequent re-expansion losses while maintaining compression efficiency.
3Ease of manufacture
If a conventional projection shape is used, then manufacturing is simple, but refrigerant flow becomes complicated causing increased losses
Solution Approach 1:
Instead of making the entire projection complex, the invention applies a simple flat surface feature at a specific location on the projection. This localized simplification maintains ease of manufacture while effectively guiding refrigerant flow to reduce losses, demonstrating how local quality modification can achieve performance improvement without sacrificing manufacturability.
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 compressor efficiency by reducing dead volume and suction loss, resulting in lower power consumption and improved energy savings in refrigeration devices.
Implementation Method 1
the flow of gas flowing from the suction port to the discharge port is blocked from going around to the peripheral wall extending in the axial direction of the projection by the flat surface, so that the gas blocked by the flat surface can be guided in the direction of the discharge port
Implementation Method 2
piston 6 reciprocates in cylinder 5 by the rotation of crankshaft 8 for transmitting the rotation force of electrical element 3. A compression mechanism for taking in, compressing, and discharging the refrigerant gas is thus formed in compression chamber 19
Data Source
AI summary
A valve plate includes a suction port to which gas to be compressed in a compression chamber flows in and a discharge port from which gas compressed in the compression chamber is discharged, a projection that appears from the discharge port with the reciprocating movement of the piston is arranged at a position facing the discharge port at a distal end face of the piston, and the projection includes a flat surface extending parallel to a reciprocating direction of the piston, so that a highly efficient hermetic type compressor that reduces the dead volume of the discharge port and reduces the loss in the compression chamber and the discharge port is provided.