Micro Hydraulic Suspension Pump Axial Positioning
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Solution Overview
Problem
Conventional hydraulic suspension micro pumps face challenges in assembly due to complex structural designs, leading to increased production costs, reduced yield, and limited scalability, primarily because of the need for precise levelness and high processing precision of components, which results in mechanical wear and damage during the assembly process.
Innovation Solution
A micro hydraulic suspension mechanical pump with a simplified structure featuring a volute, waterproof cover, positioning sheet, and hollow cup motor, allowing for quantitative and accurate axial positioning without manual adjustment, and enhanced radial suspension through alternating grooves on the rotor sleeve, facilitating efficient assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional bearing structure is used in vane-type micro pumps, then the pump can operate continuously, but mechanical friction causes wear and reduces reliability under long-term high-speed operation
Solution Approach 1:
The patent replaces the traditional mechanical bearing system with a magnetic suspension system. The magnetic bearing uses magnetic fields to suspend the rotor, eliminating mechanical contact and friction between moving parts. This substitution of mechanical support with magnetic field-based support resolves the contradiction by maintaining continuous operation capability while eliminating mechanical wear and friction.
Solution Approach 2:
The patent introduces a hydraulic suspension mechanism using fluid pressure to support and position the rotor. The hydraulic system provides a non-contact bearing surface that eliminates mechanical friction while maintaining rotor stability during continuous operation, thus resolving the contradiction between operational reliability and mechanical wear.
2Reliability
If active control solution with sensors and auxiliary coils is used for magnetic suspension, then rotor positioning is achieved, but system structure becomes complex and energy loss increases
Solution Approach 1:
The patent extracts and removes the complex active control components (sensors, auxiliary coils, control circuits) from the magnetic suspension system. By eliminating these additional subsystems, the patent simplifies the overall structure while maintaining rotor suspension capability through passive magnetic bearing design, thus resolving the contradiction between suspension stability and system complexity.
Solution Approach 2:
The patent employs a self-regulating passive magnetic bearing system that automatically maintains rotor positioning without external control inputs. The magnetic field inherently provides stable suspension through its physical properties, eliminating the need for sensors and active control circuits, thereby reducing system complexity while maintaining reliability.
3Device complexity
If permanent magnet suspension solution is used, then system structure is simplified, but suspension with full degrees of freedom cannot be implemented
Solution Approach 1:
The patent merges the permanent magnet suspension system with a hydraulic support mechanism to create a hybrid bearing system. This combination allows the system to achieve full degrees of freedom suspension capability while maintaining structural simplicity, as the hydraulic component provides the additional support needed without requiring complex active control systems.
Solution Approach 2:
The patent creates a composite bearing system combining permanent magnet materials with hydraulic fluid support. This composite approach enables the system to achieve both structural simplicity from the permanent magnet design and full suspension freedom through the complementary hydraulic support mechanism.
4Reliability
If hydraulic spiral groove thrust bearing is used for axial suspension, then axial suspension is achieved, but assembly becomes difficult due to high levelness requirements and processing precision requirements
Solution Approach 1:
The patent replaces the complex hydraulic spiral groove thrust bearing with a simplified magnetic-hydraulic suspension system. The magnetic field provides inherent axial positioning without requiring precision-machined spiral grooves or strict levelness tolerances, thus maintaining axial suspension capability while dramatically simplifying manufacturing and assembly processes.
5Reliability
If manual adjustment of axial distance between vanes and magnet rotor is used, then proper positioning is achieved, but assembly process becomes time-consuming and parts may be damaged during repeated disassembly
Solution Approach 1:
The patent incorporates preliminary positioning features directly into the pump chamber and vane assembly design. The hydraulic suspension system pre-positions the vanes at the correct axial distance from the magnet rotor through its pressure distribution, eliminating the need for manual adjustment during assembly. This preliminary positioning ensures accurate placement while reducing assembly time and preventing part damage from repeated disassembly.
Solution Approach 2:
The hydraulic suspension system automatically positions the vanes at the optimal axial distance through its inherent pressure distribution characteristics. This self-positioning capability eliminates manual adjustment requirements, reducing assembly time and preventing damage from repeated handling while ensuring reliable vane positioning.
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 improves assembly efficiency, reduces part damage, and enhances operational stability and heat dissipation, enabling reliable operation under varying conditions without the need for complex adjustments or disassembly.
Implementation Method 1
a liquid film is formed between an outer wall of the rotor sleeve and an inner wall of the waterproof cover, so that rotating parts are radially suspended
Implementation Method 2
When the liquid enters an inner bottom surface of the waterproof cover, an upward thrust is generated on the magnet rotor, thereby also generating a gap between the magnet rotor and the waterproof cover
Implementation Method 3
The synergy is generated between the magnetic force from the winding coil and hydraulic forces from the flow field, making the magnet rotor suspend in all directions
Data Source
AI summary
The invention discloses a micro hydraulic suspension mechanical pump structure and an assembling method thereof. The hydraulic suspension micro pump includes a volute, an upper end cap, a positioning sheet, an impeller, a hollow cup motor, a waterproof cover, and a rotor. The hollow cup motor includes a motor casing, a motor bottom cap, a magnet rotor, a coil, and an iron core. The waterproof cover is in a separated state from the motor, and a lower part has a positioning boss to implement radial cooperation with a recess at a corresponding position of the motor. At the same time, there is the sheet between the recess and the boss to implement axial positioning of the waterproof cover.