Jet Pump Direct Shaft Coupling High Speed
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Solution Overview
Problem
Existing jet pumps for remote control (RC) jet boats are limited by inefficiencies introduced by couplings and cantilevered shafts, preventing them from reaching high rotation rates above 25,000 revolutions per minute (rpm).
Innovation Solution
The design of pump assemblies with a motor rotor shaft directly coupled to an impeller, supported by a bearing surface within a nozzle, eliminating the need for couplings or joints, allowing for high rotation rates without introducing inefficiencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a coupled shaft with universal coupling or joint is used to connect the electric motor rotor to the impeller, then the assembly can be manufactured with standard components, but the rotation rate is limited to below 25,000 rpm due to inefficiencies at the coupling and cantilevered shaft
Solution Approach 1:
The patent removes the intermediate coupling components (universal coupling, joints, or universal joints) from the shaft assembly. The electric motor rotor is coupled directly to the impeller without any intermediate coupling elements, eliminating the inefficiencies that limited rotation rate to below 25,000 rpm.
Solution Approach 2:
The patent merges the rotor shaft and impeller into a directly coupled assembly. The rotor shaft extends directly into the impeller hub, creating a unified rotating assembly that eliminates the need for separate coupling components and enables sustained operation above 25,000 rpm.
2Speed
If a cantilevered shaft is used to support the impeller, then the structure is simpler with fewer support points, but the cantilever introduces inefficiencies that prevent rotation above 25,000 rpm
Solution Approach 1:
The patent removes the cantilevered shaft configuration and replaces it with a directly coupled rotor-impeller assembly. The rotor shaft is supported by bearings at both ends (one at the motor housing and one at the impeller hub), eliminating the cantilever inefficiencies that limited rotation speed.
3Ease of manufacture
If couplings and joints are used to connect shaft components, then assembly and disassembly are easier, but mechanical stress and inefficiencies increase at the coupling points
Solution Approach 1:
The patent combines the rotor shaft and impeller into a directly coupled assembly with no intermediate coupling components. The rotor shaft extends directly into the impeller hub, creating a unified structure that eliminates mechanical stress concentrations at coupling points while maintaining ease of assembly as a single unit.
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 sustained operation above 25,000 rpm, improving efficiency and reducing mechanical stress, enabling higher rotational speeds up to 40,000 rpm.
Implementation Method 1
The bearing surface of the impeller, and the cooperating bearing surface of the second body, support the impeller rotationally on the shaft
Data Source
AI summary
A pump assembly includes a motor arranged adjacent to a front surface of a first body, the first body having a cavity arrange between the front surface and a back surface of the first body. The motor may include a rotor having a shaft formed substantially of a single unit of material that is coupled directly to an impeller including a bearing surface received by a cooperating bearing surface arranged in a nozzle. The bearing surface of the impeller, and the cooperating bearing surface of the nozzle, support the impeller rotationally on the shaft such that when the shaft is rotatably displaced by the motor, the impeller displaces the water into the cavity arranged between the front surface of the first body and the back surface of the first body and into the nozzle to create a jet of water.