Rotary Compressor Oil Feed Path Reduces Pulsation
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Solution Overview
Problem
Conventional rotary compressors face issues with excessive oil feeding into the cylinder chamber due to the always-open high pressure fluid injection mechanism, leading to vibration and noise caused by pressure pulsation from re-expanding high pressure gas.
Innovation Solution
The oil is fed to the discharge port during the discharge process and kept contained until the next compression process, preventing excessive oil entry and reducing pulsation by ensuring the oil does not expand when pressure is reduced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the high pressure fluid injection mechanism is always open in the hermetic cylinder chamber, then the high frequency pulsation can be reduced, but an excessive amount of oil may be fed to the low pressure cylinder chamber
Solution Approach 1:
The patent introduces a dead volume chamber that is pre-filled with high pressure oil before the compression cycle begins. This preliminary action ensures that when the cylinder chamber pressure drops, the oil is already in position to suppress pulsation without needing continuous injection, thereby preventing excessive oil feeding while maintaining pulsation reduction effectiveness
Solution Approach 2:
The invention utilizes the periodic pressure changes during the compression cycle to control oil injection timing. The high pressure fluid injection mechanism operates periodically based on pressure differential conditions rather than continuously, injecting oil only when needed during specific phases of the cycle, thus reducing overall oil consumption while maintaining pulsation suppression
2Object-generated harmful factors
If the high pressure fluid injection mechanism is used to reduce vibration and noise, then the pulsation can be reduced, but the mechanism is affected by differential pressure making oil control difficult
Solution Approach 1:
The patent introduces a dead volume chamber as an intermediary between the oil injection system and the cylinder chamber. This intermediary chamber buffers the differential pressure effects, allowing for more controlled and stable oil injection timing without being directly subjected to the full pressure fluctuations, thereby improving ease of operation
Solution Approach 2:
The invention replaces complex active control mechanisms with a passive pressure-responsive system. The oil injection timing is automatically controlled by pressure differential conditions rather than requiring complex mechanical or electronic control systems, simplifying the overall mechanism and improving ease of operation
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 effectively reduces vibration and noise by preventing oil expansion and pulsation, simplifying the compressor design and reducing costs.
Implementation Method 1
the oil is fed to the discharge port (21b) in the period from the point in time in the discharge process when pressure in the cylinder chamber (25) is reduced from a peak value to when the compression process is started
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3
AI summary
An oil feed path (40) for feeding oil to the inside of a discharge port (21b) is provided in a high pressure dome type rotary compressor (1). This simple structure can reduce vibration and noise caused by re-expansion of high pressure gas remaining in the discharge port of a compression mechanism (20).