Electrically Insulating Isolating Coupler for Motor Pump Systems
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Solution Overview
Problem
Conventional motors used in welding systems for pumping coolant are not electrically isolated from the pump, which can lead to inefficiencies and safety issues, especially in high-amperage TIG machines where custom motors are costly and have long lead times.
Innovation Solution
A mechanical coupling system that electrically isolates the motor from the pump using an electrically insulating coupling system comprising an isolating coupler, ring, and clamp, allowing the motor to transmit mechanical power to the pump while maintaining electrical isolation, utilizing an autotransformer for voltage conversion and a switch module for safe power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional motors are used without electrical isolation, then mechanical power can be transmitted directly to the pump, but electrical safety issues and inefficiencies occur
Solution Approach 1:
The patent introduces an electrically insulating coupling system as an intermediary component between the motor and pump. This coupling system includes an isolating coupler, isolating ring, and isolating clamp that together provide electrical isolation while maintaining mechanical power transmission. The intermediary components allow the motor shaft to be mechanically connected to the pump impeller while preventing electrical contact, thus resolving the contradiction between safety and complexity.
2Reliability
If custom motors are used for high-amperage TIG machines, then electrical isolation can be achieved, but costs and lead times increase significantly
Solution Approach 1:
The patent segments the electrical isolation function from the motor itself and places it in a separate coupling system. This allows the use of standard commodity motors without requiring custom-wound isolated motors. The isolating coupler, isolating ring, and isolating clamp are separate components that can be manufactured independently and assembled with off-the-shelf motors, dramatically reducing cost and lead time while maintaining electrical isolation.
Solution Approach 2:
By introducing the isolating coupler as an intermediary component, the patent enables the use of standard motors with pump systems. The isolating coupler mediates between the motor shaft and pump impeller, providing the necessary electrical isolation without requiring custom motor design. This intermediary approach allows manufacturers to use readily available commodity motors, reducing both cost and lead time.
3Reliability
If electrical isolation is implemented using insulating materials, then safety is improved, but mechanical coupling strength may be reduced
Solution Approach 1:
The isolating coupler is constructed from composite materials that combine electrical insulation properties with mechanical strength. The coupling system uses materials such as reinforced polymers or fiber-composite structures that provide both the necessary electrical isolation and the mechanical strength to transmit torque from the motor to the pump. This resolves the contradiction by using materials that possess both required properties simultaneously.
Solution Approach 2:
The isolating coupler features a splined cylindrical structure with curved surfaces that optimize both mechanical engagement and electrical isolation. The splined design provides multiple contact points for torque transmission while the curved geometry of the insulating material maintains electrical breakdown distances. This geometric optimization ensures both mechanical strength and electrical safety.
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
Enables the use of commodity motors in welding systems, reducing costs and lead times by ensuring electrical isolation and efficient mechanical power transfer to the pump, enhancing safety and efficiency in cooling TIG torches.
Implementation Method 1
an electrically insulating isolating coupler configured to transmit the mechanical power to the pump
Data Source
AI summary
Provided is an electrically isolated pump system that comprises welding-type power conversion circuitry configured to convert input power to welding-type power, a motor configured to output mechanical power using motor voltage derived from the input power by a motor power conversion circuitry, and an electrically insulating isolating coupler configured to transmit the mechanical power to a pump, where the motor is electrically isolated from the pump and the pump is configured to use the transmitted mechanical power to pump fluid.