Scroll Compressor Back Pressure Chamber Floating Plate Elastic Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The upper back pressure type scroll compressor faces challenges in quickly re-operating due to residual pressure in the back pressure chamber, leading to increased initial torque requirements, noise, and abrasion, as the refrigerant from the back pressure chamber is not efficiently discharged during compressor stoppages, causing the fixed scroll to remain closely attached to the orbiting scroll.
Innovation Solution
Incorporating an elastic member between the floating plate and the discharge cover, which provides an elastic force to facilitate smooth downward movement of the floating plate, allowing quick discharge of the back pressure chamber refrigerant and minimizing the gap between the fixed and orbiting scrolls, thus reducing re-operation time and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the back pressure chamber is formed on the bottom surface of the orbiting scroll, then the structure is simple and bypass hole is easily formed, but the back pressure chamber changes in configuration and position according to orbiting motion, causing vibration and noise
Solution Approach 1:
The patent transitions from a fixed back pressure chamber configuration to a dynamic one that moves with the orbiting scroll. The back pressure chamber is formed on the orbiting scroll rather than the fixed scroll, allowing it to rotate and reposition automatically during operation, eliminating the need for complex adjustment mechanisms while maintaining structural simplicity
Solution Approach 2:
The patent incorporates a bypass hole that is pre-formed in the orbiting scroll to enable automatic pressure equalization before the compressor stops. This preliminary configuration allows the system to prepare for pressure equilibration in advance, reducing vibration and noise during operation without requiring additional active components
2Object-affected harmful factors
If the back pressure chamber is formed on the top surface of the fixed scroll, then the back pressure chamber is fixed in configuration and position, but the structure becomes relatively complicated
Solution Approach 1:
The patent merges the back pressure chamber with the orbiting scroll assembly, combining the sealing function with the rotating component. This integration allows the back pressure chamber to maintain a fixed configuration relative to the orbiting scroll while simplifying the overall structure by eliminating the need for separate fixed chamber assemblies and complex sealing arrangements
3Reliability
If the fixed scroll and orbiting scroll are strongly attached to prevent leakage, then sealing performance improves, but friction increases causing noise and abrasion
Solution Approach 1:
The patent introduces an intermediary gas pressure system between the fixed and orbiting scrolls. The back pressure chamber creates an intermediate pressure zone that mediates the contact between the scroll surfaces, allowing for controlled sealing while reducing direct mechanical friction and wear through pressure distribution rather than relying solely on strong mechanical attachment
4Reliability
If the orbiting scroll and fixed scroll are closely attached, then leakage is prevented, but the initial torque requirement increases during re-operation
Solution Approach 1:
The patent implements periodic pressure equalization cycles through the bypass hole. During operation, the back pressure chamber maintains pressure to ensure sealing, but during stoppages, the bypass hole enables periodic pressure equalization that gradually reduces the attachment force between scrolls, minimizing the initial torque requirement for re-operation while maintaining leakage prevention during active compression
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
The elastic member ensures rapid equilibration of pressures within the compressor, enabling quicker re-startup by ensuring the back pressure chamber is efficiently discharged, reducing initial torque requirements and minimizing noise and abrasion.
Implementation Method 1
an elastic member disposed between the floating plate and the discharge cover to provide an elastic force to the floating plate
Data Source
AI summary
A scroll compressor is provided that may include a casing including a rotational shaft, a discharge cover fixed inside of the casing to partition the inside of the casing into a suction space and a discharge space, a first scroll that is revolved by rotation of the rotational shaft, a second scroll that defines a plurality of compression chambers together with the first scroll, the second scroll having an intermediate pressure discharge hole that communicates with a compression chamber having an intermediate pressure of the plurality of compression chambers, a back pressure plate that defines a back pressure chamber that accommodates a refrigerant discharged from the intermediate pressure discharge hole, a floating plate movably disposed on or at a side of the back pressure plate to define the back pressure chamber together with the back pressure plate, and an elastic member disposed between the floating plate and the discharge cover to provide an elastic force to the floating plate.