Fluid-Cooled Shaft Discharge Contact for Compact Current Diverting
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Solution Overview
Problem
Existing discharge devices for electrical currents suffer from high thermal loads due to heat generation, requiring ventilation systems that increase installation space and are costly, while existing fluid guides are complex and inefficient in fluid distribution.
Innovation Solution
A discharge device with a guide unit comprising a guiding part and a retaining part forming a duct for lubricating and cooling fluid, allowing for flexible and efficient fluid distribution to cool and discharge high-frequency voltages, eliminating the need for additional cooling devices and reducing machine dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ventilation systems are used to dissipate heat, then thermal load is partially reduced, but installation space increases drastically
Solution Approach 1:
The patent combines the cooling function with the existing discharge device structure by integrating fluid guides directly into the guide unit. The lubricating and cooling fluid serves dual purposes: lubrication and heat dissipation, eliminating the need for separate ventilation systems and reducing installation space.
Solution Approach 2:
The lubricating and cooling fluid performs self-cooling by absorbing heat directly at the source where electrical currents are discharged. The fluid circulates through integrated guides, automatically removing thermal load without requiring external cooling equipment.
2Device complexity
If axial fluid guides with small cross-sectional areas are used, then device complexity is reduced, but fluid flow velocity becomes too high and insufficient fluid reaches the cooling area
Solution Approach 1:
The fluid guide is divided into multiple separate guides (first fluid guide, second fluid guide, etc.) that are distributed around the discharge device. This segmentation allows each guide to have adequate cross-sectional area for proper fluid flow while maintaining overall structural simplicity.
Solution Approach 2:
Instead of increasing the cross-sectional area of a single axial fluid guide, the patent distributes multiple fluid guides in different spatial arrangements (radial, axial, or oblique orientations). This dimensional distribution increases the total fluid carrying capacity without complicating individual guide structures.
3Reliability
If carbon brushes are used to discharge currents, then electrical resistance is low and current discharge is effective, but heat development is high causing thermal load
Solution Approach 1:
The lubricating and cooling fluid acts as an intermediary heat transfer medium between the carbon brushes and the surrounding environment. The fluid absorbs heat generated by the carbon brushes during current discharge and transports it away, allowing effective current discharge while managing thermal load.
Solution Approach 2:
The patent converts the harmful heat generated by carbon brush operation into a beneficial cooling opportunity. By introducing lubricating and cooling fluid that absorbs this heat, the previously harmful thermal load becomes a controlled thermal transfer process, improving overall system efficiency.
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 provides efficient cooling and discharge of high-frequency voltages, reduces thermal loads, minimizes machine size, and eliminates friction losses, resulting in a simpler and less expensive design with reduced overall dimensions.
Implementation Method 1
wet the contact element in the area of its sliding contact surface with a lubricating and cooling fluid... the heat generated in this process is contained or discharged with the aid of the lubricating and cooling fluid
Implementation Method 2
carbon brushes for discharging low-frequency currents... allow electrical currents to be discharge discharged directly... capacitively coupled high-frequency voltages (so-called parasitic alternating voltages), which are formed by electric drives due to the power electronics used (pulse width modulation), are discharged
Data Source
AI summary
A discharge device for discharging electric currents from a rotor part of a machine having a shaft. The discharge device has a displaceable contact element received at least partially in a guide unit and serving to form an electrically conductive sliding contact between a sliding contact surface of the contact element provided for forming the sliding contact and a shaft contact surface, the contact element being connected to the guide unit and/or a retaining element of the machine in an electrically conductive manner and the contact element being pre-loaded towards the shaft contact surface by a spring element, the contact element being wetted at least partially by a lubricating and cooling fluid, the guide unit comprising a guiding part for receiving the contact element and a retaining part for receiving the guiding part, the retaining part and the guiding part forming a duct for the lubricating and cooling fluid.