Dielectric Cooling Reservoir Baffle for Acceleration Stability
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Solution Overview
Problem
Oil cooling systems for electrical machines in mobile assemblies face reliability issues due to oil movement caused by longitudinal and lateral accelerations, leading to air entering the pump and potential draining, which compromises the cooling efficiency.
Innovation Solution
A cooling device with a heat-transfer dielectric liquid reservoir and a discharge conduit system that prevents backflow of the liquid into the casing during accelerations, ensuring the suction nozzle remains submerged in the liquid and maintaining a consistent oil level, thereby enhancing the reliability of the cooling system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oil cooling is used with a reservoir and suction nozzle arrangement, then cooling efficiency is improved, but reliability deteriorates due to air entering the pump during acceleration
Solution Approach 1:
A baffle plate is introduced as an intermediary element between the oil reservoir and the suction nozzle. The baffle plate creates a barrier that prevents oil from splashing back toward the suction nozzle during acceleration, ensuring the nozzle remains submerged in oil and preventing air from entering the pump.
Solution Approach 2:
The baffle plate extends in a direction transverse to the acceleration direction, creating a three-dimensional barrier structure. This transverse dimension blocks the path of accelerating oil, preventing it from reaching the suction nozzle while allowing the pump to continue drawing oil from the reservoir bottom.
2Quantity of substance
If the suction nozzle is positioned at the bottom of the reservoir, then oil collection is improved, but air intake risk increases during acceleration
Solution Approach 1:
The baffle plate serves as a protective intermediary positioned between the suction nozzle and the accelerating oil. It allows the nozzle to remain at the bottom for effective oil collection while blocking the harmful effect of accelerating oil that would otherwise splash back and expose the nozzle to air.
3Volume of moving object
If the reservoir is positioned directly below the casing, then compact design is achieved, but oil movement during acceleration causes lifting and air entry
Solution Approach 1:
The baffle plate is positioned within the compact reservoir structure to counteract the effects of acceleration. It creates a physical barrier that prevents oil from lifting and leaving the suction nozzle, maintaining reliable cooling operation within the compact form factor.
Solution Approach 2:
The baffle plate is positioned in advance to prevent the harmful effect of oil lifting during acceleration. By creating a barrier before acceleration can cause oil to leave the nozzle, it preemptively prevents air intake and pump draining.
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 prevents air from entering the pump and ensures consistent oil flow, improving the reliability and efficiency of the cooling system even under conditions of acceleration, such as those encountered in motor vehicles.
Implementation Method 1
a heat-transfer dielectric liquid reservoir... while the heat-transfer dielectric liquid flows through the discharge hole
Implementation Method 2
means for circulating the heat-transfer dielectric liquid in order to suck the heat-transfer dielectric liquid in the bottom of the reservoir and to spray the heat-transfer dielectric liquid onto the electrical machine
Implementation Method 3
The sprayed liquid then flows by gravity to the bottom of the casing, where it passes through holes opening into a reservoir
Data Source
AI summary
A cooling device for an electrical machine, which is intended to be mounted in a mobile assembly, the device including a dielectric liquid reservoir mounted to a casing in a leak-tight manner, and including a discharge conduit for dielectric liquid extending into the reservoir from a discharge hole of the casing at one end of the reservoir toward an opposite end of the reservoir.