Scroll Compressor Back Pressure Equalization
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Solution Overview
Problem
Twin scroll compressors face challenges in quickly and easily resolving abnormal operations in compression units, managing excessive back pressure, and maintaining proper back pressure while minimizing manufacturing costs and operational complexity.
Innovation Solution
A scroll compressor design with a main frame that includes a back pressure communication unit between compression units, utilizing back pressure chambers and sealing members to facilitate pressure equalization and minimize leakage, and incorporating eccentric portions to offset centrifugal forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If compression units are spaced apart with a drive motor therebetween, then the drive motor can be disposed in a middle portion with compression units at both ends, but it becomes difficult to share parts, increasing manufacture cost and compressor size
Solution Approach 1:
The patent merges the drive motor with the main frame by disposing the drive motor inside the main frame, allowing the compression units to be spaced apart while sharing common parts including the drive motor, thereby reducing manufacture cost and compressor size
2Ease of operation
If compression units are spaced apart with a drive motor therebetween, then the drive motor can be disposed in a middle portion, but when abnormal operation occurs in any compression unit, it becomes difficult to quickly and easily resolve the abnormal operation
Solution Approach 1:
The patent introduces a back pressure communication unit as an intermediary mechanism that connects the first and second back pressure chambers through the main frame. This allows quick resolution of abnormal operations by enabling pressure equalization between compression units without requiring disassembly or complex diagnostic procedures
3Reliability
If back pressure chambers are isolated between compression units, then each compression unit can be independently supported, but when back pressure increases excessively, the orbiting scroll comes into excessive contact with the fixed scroll, requiring valves in both compression units which increases manufacture cost
Solution Approach 1:
The patent merges the back pressure communication system by providing a single back pressure communication unit that connects both back pressure chambers through the main frame. This eliminates the need for separate valves in each compression unit, reducing manufacture cost while maintaining reliable support for orbiting scrolls
4Productivity
If back pressure communication is provided between compression units, then back pressure can be equalized quickly, but unnecessary movement of oil between compression chambers may occur
Solution Approach 1:
The patent introduces the main frame as an intermediary structure that houses the back pressure communication unit. This controlled communication path allows quick back pressure equalization while preventing unnecessary oil movement between compression chambers, as the communication is restricted to the designated back pressure chambers rather than allowing free flow between all compression chambers
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
Enables rapid recovery of appropriate back pressure, reduces friction loss, suppresses leakage, and enhances operational reliability while simplifying the structure and reducing manufacturing costs.
Implementation Method 1
a first orbiting scroll coupled to the first eccentric portion of the rotating shaft to perform an orbiting motion, and a first fixed scroll engaged with the first orbiting scroll to define a first compression chamber
Implementation Method 2
a first back pressure communication unit configured to communicate between the first back pressure chamber and the second back pressure chamber. Accordingly, even when a back pressure of the first back pressure chamber and/or the second back pressure chamber rises to a set pressure or higher when the compressor is started, a pressure in a back pressure chamber with a relatively high back pressure may be transferred to a back pressure chamber with a relatively low back pressure
Implementation Method 3
The first back pressure chamber may be disposed between the first orbiting scroll and a first side surface of the main frame to support the first orbiting scroll toward the first fixed scroll
Implementation Method 4
The rotating shaft may be coupled to a rotor of the drive motor and include a first eccentric portion and a second eccentric portion spaced apart from each other in an axial direction
Implementation Method 5
incorporating eccentric portions to offset centrifugal forces
Implementation Method 6
utilizing back pressure chambers and sealing members to facilitate pressure equalization and minimize leakage
Data Source
AI summary
A scroll compressor is provided. The scroll compressor comprises a main frame provided between a first compression unit and a second compression unit, and the main frame may comprise at least one back pressure communication unit communicating between a first back pressure chamber and a second back pressure chamber. Accordingly, even if the back pressure of the first back pressure chamber and/or the second back pressure chamber rises above a set pressure when the compressor is started, the pressure in a back pressure chamber with a relatively high back pressure is transferred to a back pressure chamber with a relatively low back pressure, thereby enabling both back pressure chambers to quickly recover an appropriate level of back pressure while suppressing friction loss and dissipation in the compression unit, and at the same time suppressing leakage between compression chambers to increase compression efficiency.