Micro Hydraulic Suspension Pump Rotor Wear Reduction
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Solution Overview
Problem
Current micro mechanical pumps face reliability issues due to bearing wear, particularly in mechanical contact bearings, which restricts the service life of the micro pump, and existing non-contact bearing suspension technologies like active control, permanent magnetic, and hydraulic suspension have limitations such as complex control circuits, limited degrees of freedom, and precision requirements.
Innovation Solution
A micro hydraulic suspension mechanical pump design featuring a volute, upper cover, brushless motor, waterproof sleeve, and water lubrication spiral groove thrust bearing, where a liquid film is formed between the stationary and rotating rings to suspend the magnetic steel rotor, reducing wear and ensuring non-contact operation, and the waterproof sleeve isolates the coil from the rotor, preventing water resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mechanical contact bearings are used in micro pump, then the structure is simple and ease of manufacture is improved, but bearing wear occurs which restricts service life and reliability
Solution Approach 1:
The patent replaces mechanical contact bearings with a hydraulic suspension system that uses a liquid film to support the rotor. The liquid film is generated by high-speed rotation of the rotor, creating hydrodynamic pressure that suspends the rotor without mechanical contact, thereby eliminating wear while maintaining structural simplicity
Solution Approach 2:
The patent employs hydraulic suspension using a liquid film between the rotor and stator. The high-speed rotating rotor generates hydrodynamic pressure in the liquid film, creating a non-contact bearing system that eliminates mechanical wear and extends service life
2Measurement precision
If active control suspension is used, then control precision and load range are improved, but control circuit complexity and power consumption increase
Solution Approach 1:
The hydraulic suspension system is self-generating, where the high-speed rotation of the rotor itself creates the hydrodynamic pressure needed for suspension. No external control circuits or additional power sources are required, as the rotor's own motion generates the suspending force
Solution Approach 2:
The system uses hydraulic principles where the rotating rotor generates a liquid film with hydrodynamic pressure that automatically suspends the rotor. This passive hydraulic suspension eliminates the need for active control circuits and sensors
3Device complexity
If permanent magnetic suspension is used, then structure simplicity and assembly requirements are improved, but full degrees of freedom suspension cannot be achieved without external forces
Solution Approach 1:
The hydraulic suspension system uses a liquid film to provide suspension in multiple directions, achieving full degrees of freedom without requiring external forces or complex magnetic arrangements. The hydrodynamic pressure distributes uniformly, enabling versatile suspension capability
4Stability of the object's composition
If hydraulic suspension with high-speed rotation is used, then structure stability and size are improved, but machining and installation precision requirements become strict
Solution Approach 1:
The system relies on the parameter of high rotational speed to generate sufficient hydrodynamic pressure in the liquid film. By changing the operational parameter (rotation speed) rather than relying on precise geometric tolerances, the system achieves stable suspension with relaxed machining requirements
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 design achieves significant reduction in wear of the magnetic steel rotor, thereby improving the service life of the micro hydraulic suspension mechanical pump by ensuring non-contact suspension and maintaining the reliability of the brushless motor's coil.
Implementation Method 1
a liquid film is formed between the stationary and rotating rings to suspend the magnetic steel rotor
Implementation Method 2
water lubrication spiral groove thrust bearing
Implementation Method 3
the coil is installed on the side wall of the motor shell... the magnetic steel rotor is located within the motor shell
Data Source
AI summary
A micro-hydraulic suspension mechanical pump includes a volute, an upper cover, an impeller, a brushless motor, a waterproof sleeve and water lubrication spiral groove thrust bearings, each having stationary and rotating rings. A water inlet and a water outlet channel are provided on the volute, and a middle water inlet hole is formed on the upper cover. The water lubrication spiral groove thrust bearings are provided above and below a magnetic steel rotor. During operation of the micro-hydraulic suspension mechanical pump, a liquid film is formed between the stationary ring and the rotating ring to enable the magnetic steel rotor to be suspended, and a liquid film is formed between the outer wall of the rotor sleeve and the inner wall of the waterproof sleeve. Due to suspension of the rotor, wear caused contact is avoided, and service life of the micromechanical pump is improved.