Wobbling-Rotor Hand Sprayer Pump for Low-Vibration Fluid Delivery
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Solution Overview
Problem
Hand-operated pressurized-fluid devices with integrated motor-pump groups suffer from increased weight, vibrations, and reduced fatigue-free operation due to the integration of the motor-pump group into the hand-held device, leading to discomfort during prolonged use.
Innovation Solution
The use of a brushless direct-current motor combined with a wobbling-rotor pump, specifically designed with toothed plates having differing spur gearings, reduces vibrations and weight, and ensures efficient, pulsation-free operation, allowing for a compact and balanced design with improved handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the motor-pump group is integrated into the hand-held device, then the device becomes more compact and portable, but the weight increases and fatigue-free operation time decreases
Solution Approach 1:
The patent changes the fundamental parameters of the motor-pump group by using a wobbling-rotor pump design with two toothed plates having different tooth counts. This design change reduces the weight of the motor-pump group while maintaining its pumping function, thereby resolving the contradiction between device compactness and weight.
2Device complexity
If the motor-pump group is integrated into the hand-held device, then the device structure is simplified, but vibrations increase and handling comfort deteriorates
Solution Approach 1:
The patent applies asymmetry by designing the two toothed plates with different numbers of teeth (first toothed plate has fewer teeth than the second toothed plate). This asymmetric design creates a wobbling motion that balances the centrifugal forces, significantly reducing vibrations generated by the motor-pump group during operation.
Solution Approach 2:
The patent utilizes controlled mechanical vibration through the wobbling-rotor mechanism. The two toothed plates are disposed at an angle to each other and wander relative to one another, creating a controlled wobbling motion that actually reduces harmful vibrations through dynamic balancing rather than eliminating motion entirely.
3Productivity
If a high-speed geared electric motor is used with an axial piston pump, then pumping performance is improved, but fluid pulsation and vibrations increase
Solution Approach 1:
The patent extracts the harmful pulsating motion from the pumping system by using a wobbling-rotor pump design that delivers fluid more continuously. The two toothed plates with different tooth counts create a smoother pumping action that reduces fluid pulsation while maintaining high pumping performance.
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 a hand-operated pressurized-fluid device with reduced vibrations, weight, and enhanced fatigue-free operation, enabling stable fluid delivery across various throughputs and applications, including fine mist dispensing, with a self-priming capability and reduced motor cooling needs.
Implementation Method 1
the motor of the motor-pump group is constructed as a brushless direct-current motor
Implementation Method 2
the pump is constructed as a wobbling-rotor pump having two toothed plates respectively provided with an annular spur gearing, wherein the numbers of teeth of the two spur gearings meshing with one another differ by 1 from one another
Data Source
AI summary
A manually operated pressure fluid device has a housing structure which receives a motor-pump group and has a fluid inlet connected to the pump on the intake side and a fluid outlet formed on a nozzle unit and connected to the pump on the delivery side, an electrical power source and a control element acting on the power supply of the motor. The motor of the motor-pump group is a brushless DC motor and the pump is a whirling rotor pump having two lock washers, each having an annular face spline, where the number of teeth of the two face splines intermeshing with each other differ from each other by one and the lock washers arranged at an angle relative to each other wander relative to each other such that the face splines delimit a plurality of pump chambers which increase and reduce in size during pump operation.