Scroll Compressor Inclined End Plate Design
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Solution Overview
Problem
Stepped scroll compressors experience significant fluid leakage and strength reduction due to stress concentration at step portions, limiting their effectiveness in three-dimensional compression and expansion.
Innovation Solution
A scroll fluid machine with inclined portions on the end plates and spiral walls, where the inter-facing surface distance continuously decreases from the outer to the inner peripheral sides, allowing for three-dimensional compression without step portions, and incorporating tip seals and coatings to minimize leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If step portions are provided on spiral walls to achieve three-dimensional compression, then compressor capacity increases, but fluid leakage increases and strength decreases
Solution Approach 1:
The invention replaces the stepped (angular) structure with a continuously curved inclined structure on the spiral walls. This curved design eliminates abrupt changes in geometry that cause fluid leakage, while still achieving three-dimensional compression through the gradual inclination of the wall surfaces from the center toward the periphery.
Solution Approach 2:
The invention changes the geometric parameters of the spiral wall by introducing a continuous inclination angle that varies from the center to the periphery. This parameter modification allows the wall height to decrease gradually rather than in discrete steps, maintaining compression capability while reducing leakage paths.
2Productivity
If step portions are provided on spiral walls to achieve three-dimensional compression, then compressor capacity increases, but stress concentrates on base portions and strength decreases
Solution Approach 1:
The continuously curved inclined surface eliminates stress concentration points that occur at the sharp edges of stepped structures. The smooth transition of the inclined wall distributes mechanical stresses more uniformly across the wall thickness, preventing localized stress accumulation at step bases.
Solution Approach 2:
By modifying the wall geometry from stepped to continuously inclined, the invention changes the stress distribution pattern. The gradual inclination allows for more uniform stress flow through the wall structure, avoiding the stress concentration that occurs at the abrupt transitions of stepped designs.
3Volume of moving object
If the inter-facing surface distance continuously decreases to enable three-dimensional compression, then size reduction is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The invention employs continuous parameter variation in the wall inclination angle, allowing for smooth transitions that are more tolerant to manufacturing variations compared to discrete stepped structures. This continuous geometry enables compact design while providing clear dimensional guidelines for manufacturing.
Solution Approach 2:
The inclined portion is provided over a specific angular range (180° or more) rather than the entire circumference, allowing different regions of the spiral wall to have different geometric characteristics. This localized application of the inclined structure optimizes the balance between compactness and manufacturability.
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 design enables efficient three-dimensional compression, reduces fluid leakage, and maintains structural strength, increasing the volume ratio and displacement capacity while facilitating accurate dimensional management.
Implementation Method 1
the fluid sucked from the outer peripheral side is not only compressed due to the decrease of a compression chamber according to the spiral shape of the wall toward the inner peripheral side, but also further compression will occur due to the decrease in the inter-facing surface distance between the end plates. As a result, three-dimensional compression becomes possible
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
In a scroll compressor (1) provided with a fixed scroll (3) and an orbiting scroll (5), an inclined portion is provided in which the inter-facing surface distance (L) between an end plate (3a) and an end plate (5a) that face each other decreases continuously from the outer peripheral side towards the inner peripheral side. The inclined portion is configured from wall inclined portions (3b1, 5b1) in which the height of a wall (3b, 5b) decreases continuously from the outer peripheral side towards the inner peripheral side, and end plate inclined portions (3a1, 5a1) in which a tooth bottom surface is inclined in accordance with the incline of the wall inclined portions (3b1, 5b1). The inclined portion is provided across a range of no less than 180° around the center of the spiral.