Scroll Compressor Intermittent Back Pressure Oil Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing scroll compressor with an asymmetric tooth shape faces challenges in evenly distributing oil to both the external and internal line side compression rooms, leading to leakage losses and reduced strength due to the asymmetry, and inadequate oil feeding results in inefficient compression and sealing performance.
Innovation Solution
The design incorporates fluid outflow paths opening at the lap tooth bottom and a communicating section control groove that intermittently communicates the back pressure room with both compression rooms, ensuring equal pressure and oil distribution by adjusting the communicating sections based on orbiting angles to match the pressure states of the external and internal line side compression rooms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the oil feeding hole is provided on the upper face of the scroll lap, then oil can be fed to the compression room, but the leakage loss at the lap tooth tip is increased and the strength of the lap is deteriorated
Solution Approach 1:
The oil feeding hole is relocated from the upper face (tooth tip side) of the scroll lap to the lower face (tooth bottom side), changing the spatial dimension of oil delivery. This allows oil to be fed to the compression room through the tooth bottom opening, avoiding the need to weaken the lap structure at the tooth tip while still achieving proper oil distribution to both compression rooms
2Quantity of substance
If the oil feeding path is provided at the inner portion of the scroll lap, then oil can reach the compression room, but the strength of the lap is deteriorated
Solution Approach 1:
Instead of providing oil feeding paths through the inner portion of the lap, the invention uses the tooth bottom opening on the lower face to deliver oil directly to the compression room. This dimensional change in oil delivery path avoids creating weak points in the lap structure while ensuring adequate oil supply to both compression rooms through the asymmetric tooth shape design
3Strength
If the oil feeding hole is provided to open to the tooth bottom, then the strength of the lap is maintained, but the oil feeding path cannot communicate with both compression rooms due to different orbiting angles
Solution Approach 1:
The oil feeding system is segmented into separate oil feeding paths for the external line side compression room and internal line side compression room, each communicating with the back pressure room through different orbiting angles. The asymmetric tooth shape creates distinct oil feeding openings at different positions, allowing each compression room to receive oil independently through its respective path, thus achieving proper oil distribution to both rooms while maintaining lap strength
Data Source
AI summary
A scroll compressor includes a fixed scroll and an orbiting scroll. Shapes of laps of the fixed scroll and the orbiting scroll are formed by an asymmetric tooth shape in which orbiting angles of an external line side compression room formed on an external line side of the orbiting scroll lap and an internal line side compression room formed on an internal line side of the orbiting scroll lap in finishing suction differ from each other. A communicating section control groove sets communicating sections communicating the respective inlet side openings of respective fluid outflow paths and a back pressure room. The communicating sections include a first communicating section of an internal line side compression room that is shorter than a second communicating section of an external line side compression room.