Scroll Compressor Fixed Wrap Reinforcing Portion Thermal Expansion
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Solution Overview
Problem
The existing scroll compressors experience compression loss and frictional loss due to non-uniform thermal expansion of the fixed scroll, leading to interference and excessive contact between the fixed wrap and the orbiting wrap, particularly near the suction chamber, which results in refrigerant leakage and abrasion.
Innovation Solution
The solution involves forming a reinforcing portion on the fixed wrap near the suction chamber with an increased wrap thickness to prevent thermal transformation and interference with the orbiting wrap, ensuring a consistent distance between the two wraps and reducing frictional losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the fixed wrap is made with uniform thickness, then the manufacturing is simple, but thermal expansion causes interference and excessive contact with the orbiting wrap near the suction chamber
Solution Approach 1:
The fixed wrap is designed with non-uniform thickness, specifically with increased thickness at the suction chamber end and decreased thickness at the discharge chamber end. This local variation in geometry compensates for the non-uniform thermal expansion that occurs during operation, preventing interference and excessive contact between the fixed and orbiting wraps while maintaining reliable compression efficiency.
2Device complexity
If the fixed scroll plate portion is exposed to discharge temperature, then the structure is simplified, but the fixed wrap undergoes non-uniform thermal transformation causing distortion
Solution Approach 1:
The fixed wrap thickness is varied locally along its length, with the thickest section at the suction chamber end and progressively thinner sections toward the discharge chamber. This gradient thickness distribution creates a compensating effect against the non-uniform thermal expansion caused by exposure to discharge temperature, maintaining the wrap's shape stability and preventing distortion.
3Temperature
If the fixed wrap near suction chamber is thinner, then the thermal expansion is reduced, but the wrap becomes weaker and more prone to deformation
Solution Approach 1:
The fixed wrap is designed with maximum thickness at the suction chamber end where thermal expansion is most significant, providing both dimensional stability and structural strength in this critical region. The thickness gradually decreases toward the discharge chamber where thermal expansion is less severe, optimizing the balance between thermal compensation and mechanical strength throughout the wrap's length.
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 the compression efficiency by preventing refrigerant leakage and reducing frictional losses between the fixed and orbiting scrolls, thereby improving the reliability and performance of the scroll compressor.
Implementation Method 1
the plate portion of the fixed scroll is entirely influenced by the refrigerant discharge temperature to be thermally-expanded. More specifically, a part or portion of the fixed wrap near a suction chamber is influenced by a suction temperature, a part or portion of the fixed wrap near an intermediate pressure chamber is influenced by an intermediate compression temperature, and a part or portion of the fixed wrap near a discharge chamber is influenced by a discharge temperature.
Implementation Method 2
A wrap thickness of the fixed wrap near the suction chamber may be large. Therefore, a thermal transformation of the fixed wrap near the suction chamber may be prevented.
Data Source
AI summary
A scroll compressor is provided that may include an orbiting scroll having an orbiting wrap, and which performs an orbiting motion; and a fixed scroll having a fixed wrap to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber, by being engaged with the orbiting wrap. A wrap thickness of the fixed wrap may be greater than a wrap thickness of the orbiting wrap within a range which forms the suction chamber. With such a configuration, even if the fixed scroll or the orbiting scroll is thermally-expanded, a transformation of the fixed wrap at a suction side may be prevented. This may prevent a gap between the fixed wrap and the orbiting wrap at an opposite side to the suction side, thereby enhancing compression efficiency.