Air conditioning system and cooling method for drive motor thereof
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Air conditioning systems with multi-stage compressors face inefficiencies due to excessive heat generation by the drive motor, which can lead to system failure and require effective cooling methods to maintain efficiency.
Innovation Solution
An air conditioning system with a cooling branch that directs refrigerant flow through the drive motor, utilizing a regulating valve controlled by a control module based on temperature and suction pressure to optimize refrigerant mass flow and outlet positions, allowing for efficient motor cooling and system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If refrigerant is used to cool the drive motor, then the motor temperature is reduced, but the system efficiency deteriorates due to excessive heat generation and potential liquid shock
Solution Approach 1:
The suction port is divided into multiple stages (first-stage suction port and intermediate-stage suction port), allowing the cooling branch to selectively connect to different stages. This segmentation enables optimized refrigerant flow paths that improve cooling efficiency while maintaining system performance
Solution Approach 2:
The cooling branch is configured to deliver refrigerant to specific locations (drive motor) that require cooling, rather than uniformly cooling the entire system. The regulating valve controls refrigerant flow locally at the cooling branch to achieve precise temperature control without adversely affecting overall system efficiency
2Temperature
If a cooling branch is added to cool the drive motor, then motor cooling is improved, but the device complexity increases
Solution Approach 1:
The cooling branch serves multiple functions: it cools the drive motor, manages heat generation, and can be integrated with existing multi-stage compression architecture. The same refrigerant flow path serves both compression and cooling purposes, reducing the need for separate dedicated cooling systems
Solution Approach 2:
The system uses its own refrigerant circulation to provide cooling for the drive motor, rather than requiring an external cooling system. The refrigerant that is already part of the main circuit is diverted through the cooling branch to cool the motor, making the system self-sufficient
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 solution effectively maintains or improves system efficiency by ensuring proper cooling of the drive motor, preventing overheating and ensuring refrigerant is in a gaseous state for efficient compression, thus avoiding liquid shock and enhancing overall system performance.
Implementation Method 1
the refrigerant from the cooling branch flows through the drive motor of the multi-stage compressor
Implementation Method 2
an evaporator connected to a suction port of the compressor
Data Source
AI summary
An air conditioning system includes a main circuit having a multi-stage compressor, a condenser, a throttling element and an evaporator connected by pipelines; and a cooling branch, the inlet of which is connected to the main circuit between the condenser and the throttling element, and the outlet of which is connected to at least one of the first-stage suction port and the intermediate-stage suction port of the multi-stage compressor, wherein refrigerant from the cooling branch flows through the drive motor of the multi-stage compressor, and a regulating valve for controlling the opening of the cooling branch is provided on the cooling branch; and a control module that controls the opening of the regulating valve on the cooling branch based on the temperature of the outlet downstream of the drive motor on the cooling branch and the intermediate suction pressure of the intermediate-stage suction port of the multi-stage compressor.