Reciprocating Compressor Oil Feeding Mechanism
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Solution Overview
Problem
Conventional sealed compressors face issues with driving power loss and reduced volumetric efficiency due to high-temperature refrigerant oil scattering, leading to increased gaseous refrigerant temperature and friction at slide portions, and potential damage from solid substances in the lubricating oil.
Innovation Solution
A reciprocating compressor design featuring an oil feeding mechanism that directs lubricating oil to specific regions, preventing scattering and mixing with gaseous refrigerant, and includes a communicating passage and oil feeding port configuration to separate solid substances, ensuring uniform oil distribution and lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If refrigerant oil is scattered out from the upper portion of the rotary shaft to lubricate slide portions, then lubrication is improved, but the refrigerant oil mixes with gaseous refrigerant causing temperature increase and reduced volumetric efficiency
Solution Approach 1:
The patent segments the oil feeding function by providing dedicated oil feeding holes in the eccentric shaft that direct oil to specific locations (piston pin and connecting rod) rather than scattering oil broadly. This segmentation prevents oil from mixing with gaseous refrigerant while ensuring proper lubrication reaches the slide portions through controlled pathways.
Solution Approach 2:
The patent introduces an intermediary oil feeding mechanism (oil feeding holes and communication passages) between the refrigerant oil source and the slide portions. This intermediary system controls the oil delivery path, preventing direct contact between scattered oil and gaseous refrigerant while still achieving lubrication of the piston-cylinder interface.
2Reliability
If high-temperature refrigerant oil is used for lubrication, then lubrication film formation is improved, but friction and wear increase in regions where bubbles are present
Solution Approach 1:
The patent extracts the harmful bubbles from the lubrication system by providing separate oil feeding pathways that deliver clean refrigerant oil directly to the piston pin and connecting rod. This extraction of bubbles from the oil supply prevents their interference with lubrication film formation at the slide portions, eliminating the regions where friction and wear would occur.
3Device complexity
If lubricating oil is suctioned from the bottom portion of the sealed container, then oil supply is simplified, but solid substances damage the slide portions
Solution Approach 1:
The patent applies preliminary action by filtering solid substances from the lubricating oil before it reaches the slide portions. The oil feeding holes in the eccentric shaft and the communication passages in the connecting rod act as preliminary filtration points, preventing solid particles from entering the critical piston-cylinder interface and causing damage.
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
The design reduces driving power loss, improves volumetric efficiency, and extends the compressor's lifespan by preventing oil scattering, maintaining refrigerant temperature, and avoiding damage from solid substances.
Implementation Method 1
a driving power loss in the sealed compressor is reduced by sufficiently feeding oil to slide portions
Implementation Method 2
a communicating passage provided inside of the connecting rod such that the smaller-shaft hole and the specified region are communicated with each other via the communicating passage
Implementation Method 3
a piston pin provided in the piston so as to extend transversely in the internal space; a connecting rod one end portion of which is rotatably fitted to the eccentric shaft and the other end portion of which is inserted into the internal space of the piston
Data Source
AI summary
A reciprocating compressor of the present invention includes an electric component (6), a compression component (9), and a container (1). The compression component includes a cylinder (14), a piston (16), an eccentric shaft (33), a piston pin (23), a connecting rod (22), an oil feeding mechanism (51), a communicating passage (22c), an oil feeding passage (23a), a communicating hole (22d) which is provided in the connecting rod such that a smaller-shaft hole (22b) and an internal space of the piston are communicated with each other via the communicating hole, and discharges the oil fed to the smaller-shaft hole to the internal space of the piston; and an oil feeding port (23b) provided in the piston pin such that the oil feeding passage and the smaller-shaft hole are communicated with each other via the oil feeding port and feeds the oil fed to the smaller-shaft hole to the oil feeding passage; wherein the oil feeding port is provided in the piston pin in a location other than a location facing a location at which the communicating passage opens in the smaller-shaft hole.