Scroll Compressor Drainage Mechanism for Liquid Discharge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-displacement scroll compressors face issues with liquid discharge, leading to scroll blade damage and increased torque during start-up, affecting motor life and reliability.
Innovation Solution
A compression mechanism with a discharge passage and passive discharge control mechanism, utilizing a movable blocking member and pressure difference generated by the compression mechanism itself to manage liquid discharge without external power sources, reducing starting torque and impact on the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the axial separation distance of the compression mechanism is limited or the compression mechanism is not designed axially flexibly, then the structure is more compact and stable, but the liquid in the compression chamber cannot be discharged in time, causing the scroll blade to be subjected to great impact force
Solution Approach 1:
The patent extracts the liquid discharge function from the traditional axial separation mechanism by introducing a dedicated discharge passage and movable blocking member system. This allows liquid to be removed separately through the discharge passage without requiring axial flexibility of the compression mechanism, thus maintaining structural stability while eliminating liquid impact damage.
Solution Approach 2:
The movable blocking member acts as an intermediary between the compression chamber and the discharge passage. It controls the opening and closing of the discharge passage based on pressure differential, mediating the liquid discharge process and preventing direct liquid impact on the scroll blade while maintaining compression integrity.
2Power
If an enormous torque is generated at the moment of start-up, then the compression mechanism can overcome initial resistance, but it generates certain impact on the motor, affecting the service life of the motor
Solution Approach 1:
The patent applies preliminary action by opening the discharge passage before the compression mechanism starts compressing the refrigerant. This allows excessive liquid to be discharged in advance through the discharge passage controlled by the movable blocking member, reducing the liquid load on the motor during startup and thereby reducing starting torque and impact on motor reliability.
3Object-affected harmful factors
If a discharge passage and discharge control mechanism are added, then liquid can be discharged in time, but the structure becomes more complex and costs increase
Solution Approach 1:
The discharge control mechanism is designed to be self-regulating using the pressure differential that naturally exists during compression. The movable blocking member automatically opens when pressure in the discharge passage exceeds compression chamber pressure and closes when it drops, eliminating the need for external control systems, sensors, or additional power sources. This keeps the structure simple while achieving effective liquid discharge.
4Object-affected harmful factors
If a movable blocking member is controlled by a back pressure chamber and pressure tapping hole, then liquid discharge is achieved, but the structure becomes more complex
Solution Approach 1:
The patent merges the control function of the movable blocking member with the existing back pressure chamber and pressure tapping hole of the compression mechanism. The back pressure chamber, which normally maintains compression stability, is integrated to control the blocking member's position. This integration achieves liquid discharge control without adding separate control chambers or passages, keeping the structure simple.
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
Effectively discharges excessive liquid, preventing scroll blade damage and reducing starting torque, thereby extending motor life and improving compressor reliability with a simple, cost-effective design.
Implementation Method 1
a movable blocking member provided in the discharge passage and movable between an open position at which the discharge passage provides the fluid communication and a closed position at which the discharge passage does not provide the fluid communication under an action of the pressure difference
Data Source
AI summary
A compression mechanism, and a scroll compressor, for the scroll compressor are provided, wherein the compression mechanism includes a movable scroll having a movable scroll end plate and a fixed scroll having a fixed scroll end plate. A movable scroll blade and a fixed scroll blade are engaged with each other to form a series of compression cavities between the movable scroll and the fixed scroll. A series of compression cavities include a central compression cavity and fluid compression cavities located on the radial lateral side of the central compression cavity. The compression mechanism is provided with a drainage channel and a drainage control mechanism, which enables the drainage channel to selectively provide fluid communication between a first fluid compression cavity in the fluid compression cavities and the outside of the compression mechanism.