Scroll Compressor Bypass Valve to Prevent Motor Voltage Induction
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Solution Overview
Problem
Conventional electrically driven scroll compressors in air-conditioning systems of motor vehicles face issues with voltage induction in the electric motor when the drive is switched off, leading to unsafe operation and high maintenance costs due to complex safety measures.
Innovation Solution
A device with a bypass flow path and pressure-dependent control mechanism, such as a non-return valve, to manage fluid flow, preventing the compression mechanism from being unintentionally activated and inducing high voltages in the electric motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electric motor is switched off to stop compression, then energy consumption is reduced, but voltage induction occurs in the electric motor due to fluid flow through the compression mechanism
Solution Approach 1:
The invention extracts the harmful back-flow of refrigerant from the compression mechanism by introducing a bypass line with a non-return valve. The bypass line provides an alternative path for the refrigerant to exit the compression mechanism without driving the compressor, thereby removing the cause of voltage induction while maintaining normal compression function.
Solution Approach 2:
The non-return valve acts as an intermediary element in the bypass line, controlling the flow direction of the refrigerant. It allows the refrigerant to flow through the bypass line in the correct direction while preventing reverse flow that would drive the compressor and induce voltage, thus mediating between the compression mechanism and the electrical system.
2Reliability
If complex safety circuits are added to prevent voltage induction, then system safety is improved, but device complexity and maintenance costs increase
Solution Approach 1:
The system uses the refrigerant's own pressure differential and the non-return valve's mechanical design to automatically prevent voltage induction without requiring external control systems, sensors, or complex electrical circuits. The bypass line with non-return valve self-regulates the refrigerant flow based on pressure differences, eliminating the need for active safety circuits.
Solution Approach 2:
The invention replaces complex electrical safety circuits with a simple mechanical solution using a non-return valve in a bypass line. The mechanical design of the non-return valve automatically responds to pressure differences and prevents harmful back-flow without requiring electrical control, thereby simplifying the overall system while maintaining safety.
3Ease of repair
If the compression mechanism is designed to be easily detachable, then ease of repair is improved, but sealing complexity increases
Solution Approach 1:
The compression mechanism is segmented into separable components (compressor housing, bypass line, non-return valve, compression mechanism) that can be independently removed. The bypass line is designed as a separate component with threaded connections, allowing the compression mechanism to be detached from the housing for repair or replacement without disassembling the entire system.
Solution Approach 2:
The bypass line with non-return valve is pre-installed and sealed within the compressor housing before the compression mechanism is assembled. This preliminary sealing arrangement ensures that when the compression mechanism is detached for repair, the sealing interfaces are already prepared and positioned correctly, simplifying the reassembly process and ensuring proper sealing without complex sealing operations during repair.
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
Ensures safe operation with minimal components and costs by controlling fluid flow based on pressure differences, reducing the risk of voltage induction and maintaining system safety without complex electrical circuits.
Implementation Method 1
The bypass flow path is opened and closes in a pressure-dependent manner, from an original suction side to a pressure side. The device for controlling the through-flow of the fluid is designed to open the bypass flow path solely for the fluid to flow through in a flow direction from the suction-pressure chamber into the high-pressure chamber depending on the respective pressure level of the fluid in the suction-pressure chamber and in the high-pressure chamber.
Implementation Method 2
The mass flow of the refrigerant caused during operation of the compressor deviating from operation in compressor mode when the electric motor is switched off can be caused by the refrigerant flowing out of the refrigerant circuit, the components of which also include the compressor. The mass flow of the refrigerant through the compressor can result in the movement of the compressor mechanism, specifically of the orbiter connected to the drive shaft, and thus in a movement of the magnetic rotor relative to the stator of the electric motor. As a result, an electrical voltage is induced inside the coils of the stator of the electric motor.
Data Source
AI summary
A device for compressing a gaseous fluid, in particular a refrigerant in a refrigerant circuit, specifically of an air-conditioning system of a motor vehicle. The device has a housing, a compression mechanism for compressing the gaseous fluid, and an electric motor for driving the compression mechanism. The housing is formed with a suction-pressure chamber and a high-pressure chamber.