Rotary Compressor Vane Lubrication and Groove Simplification
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Solution Overview
Problem
Rotary compressors face efficiency issues due to friction and abrasion between the vane and coupling groove, leading to oil supply challenges, increased processing costs, and prolonged fabrication times, as well as leakage of compressed fluid.
Innovation Solution
Incorporating an oil passage system with grooves on the vane and piston, and an elastic member to facilitate efficient oil distribution and reduce friction, allowing the vane and piston to be made of the same material, thus eliminating the need for precise processing of the coupling groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coupling groove is precisely processed to correspond to the vane's outer circumferential surface, then the reliability of the vane-piston connection is improved, but the manufacturing cost and processing time are greatly increased
Solution Approach 1:
The invention changes the geometric parameters of the coupling groove from a precisely fitted shape to a standardized circular shape with a predetermined diameter. This parameter change allows the coupling groove to be formed by simple drilling or punching operations rather than complex precision machining, significantly reducing manufacturing cost and processing time while maintaining adequate connection reliability through the elastic member's compressive force
Solution Approach 2:
The invention introduces an elastic member as a separate component that segments the coupling system into three parts: the piston body, the elastic member, and the vane. This segmentation allows the coupling groove to be simplified while the elastic member provides the necessary connection force and reliability, decoupling the precision requirement from the groove geometry itself
2Reliability
If different materials are used for the vane and rolling piston to prevent seizure, then the reliability is improved, but the device complexity and manufacturing cost are increased
Solution Approach 1:
The invention introduces an elastic member as an intermediary component between the vane and piston that provides lubrication and reduces friction. This intermediary allows both the vane and piston to be made of the same material while still preventing seizure, as the elastic member's material properties (such as rubber or polymer) provide the necessary friction reduction without requiring dissimilar materials for the main components
3Reliability
If sufficient oil is supplied between the vane and coupling groove to prevent abrasion, then the reliability is improved, but the device complexity is increased
Solution Approach 1:
The elastic member serves a dual function: it provides the compressive force to maintain connection between the vane and piston, and simultaneously acts as an oil reservoir that supplies lubrication to the friction surfaces. This self-service approach eliminates the need for separate oil supply channels and pumps, reducing device complexity while ensuring adequate lubrication to prevent abrasion
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 solution ensures effective lubrication, prevents fluid leakage, reduces production costs and processing time, and allows for uniform oil distribution, enhancing the compressor's efficiency and operational reliability.
Implementation Method 1
an elastic member, and a vane... an elastic member... surrounding at least a part of the circumference of one end of the vane... preventing separation of one end of the vane
Implementation Method 2
an oil passage... disposed between one end of the vane and the rolling piston so as to receive oil therethrough... prevents abrasion of the one end of the vane and the coupling groove
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
Rotary compressor including a cylinder (400), a drive unit, a piston (300), a vane (500), and an oil passage (F). The cylinder includes a suction chamber (410) for suctioning fluid and a compression chamber (420) for compressing fluid. The drive unit rotates a drive shaft (230) by connecting to the cylinder (400). The piston (300) oscillates in the cylinder by connecting to the drive shaft (230). The vane (500) extends between the cylinder (400) and the piston (300) so as to separate the suction chamber from the compression chamber, and some parts of the length of the vane are inserted into a slide groove (450) formed in the cylinder. One end of the vane is connected to the coupling groove (390) formed in the piston. The oil passage (F) is disposed between one end of the vane (500) and the rolling piston (300) so as to receive oil therethrough.