Hermetic compressor and refrigeration device comprising same
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Solution Overview
Problem
The existing bearing devices in sealed compressors face issues with insufficient lubricating oil supply to the balls, leading to increased noise and decreased efficiency due to oil flowing to the outer peripheral sides of the races, and potential instability in the contact state between the raceway grooves and balls, which can impede smooth rolling.
Innovation Solution
The implementation of a sealed compressor design with raceway grooves on the upper and lower races, along with limiting means to prevent displacement, ensures stable lubricating oil supply to the balls and maintains smooth rolling by preventing deviation between the raceway grooves, thereby reducing noise and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flat plate shaped upper and lower annular races are used, then the structure is simple, but lubricating oil flows to outer peripheral sides causing insufficient oil supply to balls
Solution Approach 1:
The flat plate shaped races are segmented by introducing annular grooves that divide the surface into functional zones. The grooves create distinct oil supply channels and contact regions, preventing oil from flowing to outer peripheral sides while maintaining adequate oil supply to the balls.
Solution Approach 2:
Different regions of the race surfaces are given different functional qualities through the annular grooves. The grooved regions channel lubricating oil toward the ball contact points, while other regions maintain structural integrity. This local differentiation ensures reliable oil supply without compromising overall structural simplicity.
2Reliability
If raceway grooves are provided on upper and lower races, then lubricating oil supply to balls is improved, but deviation between raceway grooves may occur impeding smooth rolling
Solution Approach 1:
The upper and lower annular grooves are positioned asymmetrically relative to each other, with intentional offset designed to compensate for manufacturing deviations and operational deformations. This asymmetric arrangement ensures that even when deviation occurs, the grooves maintain adequate alignment for smooth ball rolling while continuing to channel oil effectively.
Solution Approach 2:
The design anticipates potential deviation between raceway grooves and incorporates tolerance compensation features in advance. The grooves are designed with sufficient width and depth margins that accommodate expected manufacturing variations, cushioning against the harmful effects of misalignment before they can impede smooth rolling.
3Stability of the object's composition
If limiting means are added to prevent displacement of upper race, then smooth rolling is maintained, but device complexity increases
Solution Approach 1:
The limiting means is merged with the existing bearing structure by integrating it into the housing or mounting components. Rather than adding separate independent limiting devices, the design combines the limiting function with structural elements already present in the compressor, thereby maintaining position stability while minimizing increases in overall device complexity.
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 ensures smooth rotation of the balls, reduces sliding losses, and increases the efficiency of the sealed compressor by stabilizing the lubricating oil supply and maintaining proper contact between the races and balls, resulting in a quieter and more efficient operation.
Implementation Method 1
raceway grooves formed by annular grooves are provided on the main surface of the upper race and on the main surface of the lower race, respectively... ensures stable lubricating oil supply to the balls
Implementation Method 2
at least one limiting means for limiting a displacement of the upper race with respect to the shaft... maintains smooth rolling by preventing deviation between the raceway grooves
Implementation Method 3
The balls are placed on the raceway groove of the upper race and on the raceway groove of the lower race... reduces sliding losses, and increases the efficiency
Data Source
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AI summary
A sealed compressor comprises a sealed container (101) which accommodates an electric component (105) and a compression component (106); wherein the compression component (106) includes a shaft (110) including a main shaft section (111) and an eccentric shaft section (112), a cylinder block (114), a piston (126), and a main bearing unit (120) mounted to the cylinder block (114) and supporting the main shaft section (112) such that the main shaft section (112) is rotatable, a thrust ball bearing (132) mounted to a thrust surface (130) of the main bearing unit (120); and the thrust ball bearing (132) includes a plurality of balls(134) held in a cage (133), an upper race (135) having main surfaces one of which is in contact with upper portions of the balls (134); and a lower race (136) having main surfaces one of which is in contact with lower portions of the balls (134) and; a restricting means for restricting a displacement of the upper race (135) with respect to the shaft (110).