Scroll Compressor Elastic Biasing for Reduced Start-Up Load
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Solution Overview
Problem
Conventional scroll compressors face difficulties in startability due to high compression loads when using single-phase motors with small starting torque, as complete compression starts immediately after activation, imposing a large load on the motor.
Innovation Solution
Incorporating an elastic body that biases the non-orbiting and orbiting scrolls to create a gap between them at activation, reducing the compression load and improving startability by allowing incomplete compression initially, which is stabilized as the compressor operates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixed scroll and orbiting scroll are pressed together with self-weight to improve sealing performance, then the sealing performance of the compression chamber is improved, but the compression load on the motor increases immediately after activation making it difficult to start
Solution Approach 1:
The patent applies a dynamic approach by using an elastic body (spring) to provide a biasing force that separates the fixed scroll and orbiting scroll during motor startup. As the motor accelerates and compression pressure builds, the scrolls are progressively pressed together, transitioning from a separated state (reducing starting load) to a contact state (improving sealing). This dynamic adjustment resolves the contradiction between easy startup and good sealing performance.
Solution Approach 2:
The elastic body is pre-loaded to create a gap between the scrolls before motor activation. This preliminary separation prevents complete compression from occurring immediately at startup, reducing the compression load on the motor. As the motor runs and pressure builds, the scrolls naturally move into contact, achieving proper sealing without requiring high starting torque.
2Reliability
If a chip seal is provided between the fixed scroll and orbiting scroll to improve sealing, then the sealing performance of the compression chamber is improved, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates the chip seal component from the system. Instead of adding a separate sealing element between the scrolls, it uses the elastic body to control the contact pressure and separation between the scroll surfaces themselves. This approach maintains sealing performance while reducing structural complexity by removing the chip seal and its associated mounting requirements.
Solution Approach 2:
The elastic body acts as an intermediary mechanism that controls the interaction between the fixed scroll and orbiting scroll. Rather than using a chip seal to force the scrolls together, the elastic body mediates the contact pressure dynamically, allowing the scroll surfaces themselves to provide the sealing function without additional sealing components.
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 enhances the startability of the compressor by reducing the initial compression load, allowing easier activation with single-phase motors and maintaining efficiency as the compressor reaches full compression over time.
Implementation Method 1
an elastic body that biases one of the non-orbiting scroll and the orbiting scroll so as to separate the non-orbiting scroll and the orbiting scroll from each other
Data Source
AI summary
A scroll compressor according to the present disclosure includes a partition wall that divides a sealed vessel into a high-pressure space and a low-pressure space, a non-orbiting scroll provided in the low-pressure space, an orbiting scroll that forms a compression chamber between the orbiting scroll and the non-orbiting scroll, and a rotational shaft. The scroll compressor further includes a main bearing that supports the orbiting scroll, an elastic body that biases one of the non-orbiting scroll and the orbiting scroll so as to separate the non-orbiting scroll and the orbiting scroll from each other, and a plurality of columnar members that are fixed at one ends of the columnar members and are movable at the other ends of the columnar members, and are disposed in a circumferential direction. The non-orbiting scroll or the orbiting scroll that is biased by the elastic body is movable between the partition wall and the main bearing in an axial direction of the rotational shaft. The elastic body is disposed between the plurality of columnar members in the circumferential direction.