Scroll Compressor Thrust Plate Self-Rotation Prevention
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Solution Overview
Problem
The existing scroll compressor design limits the size of the orbiting scroll due to interference from positioning pins, restricting the compressor's performance and capacity.
Innovation Solution
The design incorporates a thrust oil return pipe inserted into a hole portion of the thrust plate, preventing self-rotation without the need for positioning pins, allowing for a larger orbiting scroll and enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positioning pin is used to couple the fixed scroll and frame to prevent thrust plate self-rotation, then the thrust plate self-rotation is prevented, but the orbiting scroll size is limited due to interference
Solution Approach 1:
The invention extracts the self-rotation prevention function from the positioning pin system and relocates it to the thrust oil return pipe. The positioning pin is removed entirely, and the thrust oil return pipe is made to serve dual purposes: oil return and thrust plate positioning. This eliminates the interference problem while maintaining the self-rotation prevention function.
Solution Approach 2:
The thrust oil return pipe is given multiple functions: it serves as both the oil return passage and the positioning element that prevents thrust plate self-rotation. By making the thrust oil return pipe extend beyond the thrust plate surface, it acts as a stopper that limits the thrust plate's rotational movement, eliminating the need for a separate positioning pin.
2Reliability
If a positioning pin is used to prevent thrust plate self-rotation, then the thrust plate is stabilized, but the compressor performance is limited due to restricted orbiting scroll size
Solution Approach 1:
The invention removes the positioning pin that was limiting the orbiting scroll size and transfers its functional role to the thrust oil return pipe. This allows the orbiting scroll to be enlarged for higher compressor capacity while the thrust plate stability is maintained through the extended oil return pipe design.
Solution Approach 2:
The invention changes the geometric parameters of the thrust oil return pipe, specifically extending its length beyond the thrust plate surface. This parameter change allows the oil return pipe to function as a positioning element, providing thrust plate stability without constraining the orbiting scroll dimensions, thereby enabling higher compressor performance.
3Device complexity
If positioning pins are used to couple the fixed scroll and frame, then the structure is simplified, but the device complexity increases due to additional components
Solution Approach 1:
The invention removes the positioning pin component entirely from the assembly. The self-rotation prevention function is integrated into the thrust oil return pipe structure, reducing the total number of parts and simplifying the assembly process while maintaining the necessary functional constraints.
Solution Approach 2:
The invention merges the oil return function and the positioning function into a single component - the thrust oil return pipe. By combining these two functions, the design eliminates the need for separate positioning pins and reduces the overall component count, simplifying both the device structure and manufacturing process.
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 solution enables the use of a larger orbiting scroll, improving compressor performance while reducing noise and vibration by eliminating the need for positioning pins, thus enhancing the overall efficiency and reliability.
Implementation Method 1
the thrust oil return pipe is inserted into the hole portion and is fit in the thrust plate... makes it possible to prevent the self-rotation of the thrust plate
Data Source
AI summary
A scroll compressor includes: a shell forming an outer case, a fixed scroll and an orbiting scroll stored in the shell, a frame holding the orbiting scroll, a thrust plate between the orbiting scroll and the frame, and a thrust oil return pipe fixed to the frame. The shell forms an oil reservoir in which lubricating oil is reserved. The orbiting scroll and fixed scroll form a compression chamber. Lubricating oil flows through the thrust oil return pipe to return to the oil reservoir. A hole portion on the thrust plate passes from a first surface portion that slidably contacts the orbiting scroll to a second surface portion facing the frame. The thrust oil return pipe is inserted into the hole portion and fits in the thrust plate. An upper end portion of the thrust oil return pipe does not protrude from the first surface portion of the thrust plate