Split-Type Blade Structure for Low-Speed Hydraulic Leakage Control
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Solution Overview
Problem
Current hydraulic motors suffer from significant leakage and abrasion issues due to traditional blades with low centrifugal force at low rotation speeds, and integrated penetrating blades face high abrasion and leakage due to low flatness and deformability, leading to reduced service life and efficiency.
Innovation Solution
The introduction of a split-type blade with a penetrating pushing rod structure, comprising metal pushing rods and plastic valve plates, featuring high flatness and reinforced ribs, which ensures minimal gap and contact area with the rotor, reducing abrasion and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional blade is used in low rotation speed hydraulic motors, then the blade structure is simple, but the centrifugal force is too small to cause the blade to slide, resulting in a large gap between the blade and stator wall causing serious leakage
Solution Approach 1:
The blade is divided into two independent parts: a pushing rod that penetrates the rotor and a valve plate that contacts the stator wall. This segmentation allows the pushing rod to be driven by centrifugal force while the valve plate maintains contact with the stator wall through elastic force, solving the leakage problem without increasing overall structural complexity
Solution Approach 2:
The pushing rod acts as an intermediary element that transmits the driving force from the rotor to the valve plate. It converts centrifugal force into linear motion that pushes the valve plate against the stator wall, enabling effective sealing at low rotation speeds
2Reliability
If a spring structure is added to make the traditional blade abut against the rotor inner wall at low rotation speed, then the blade can maintain contact, but the spring compression force becomes large causing serious abrasion between the blade and stator and large noise
Solution Approach 1:
The spring structure is extracted and replaced by a gravity-based positioning mechanism. The valve plate is positioned at the bottom of the pushing rod, and gravity naturally maintains contact between the valve plate and stator wall without requiring additional spring components, thereby eliminating excessive compression forces and associated harm
Solution Approach 2:
The valve plate automatically maintains contact with the stator wall through its own weight (gravity) without requiring external spring force. The system uses the inherent gravitational force to ensure continuous contact, eliminating the need for additional active components that would cause abrasion and noise
3Device complexity
If an integrated penetrating blade is used to maintain contact throughout any rotation speed, then the blade structure is simplified, but the integrated structure is difficult to achieve high flatness causing large gaps and serious abrasion between the blade and rotor
Solution Approach 1:
The blade is segmented into a pushing rod and a valve plate, allowing each component to be manufactured separately with high precision. The pushing rod ensures precise positioning through its penetration into the rotor, while the valve plate achieves high flatness for contact with the stator wall, overcoming the manufacturing difficulties of integrated structures
Solution Approach 2:
The pushing rod serves as a precision intermediary that positions the valve plate relative to the rotor. It transmits the positioning function from the rotor to the valve plate, enabling the valve plate to achieve high flatness contact with the stator wall while maintaining the structural benefits of penetration
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 split-type blade design effectively minimizes leakage and abrasion, enhances operational reliability, and extends the service life of the hydraulic motor by maintaining precise alignment and reducing contact surfaces, even at low rotation speeds.
Implementation Method 1
the pushing rod is configured to slide along a radial direction of the rotor; so that an outer edge portion of the valve plate abuts against an inner wall of a stator throughout
Implementation Method 2
at least one elastic member, in which the elastic member is positioned between the valve plate and the stator when the valve plate is positioned in the positive displacement area or the negative displacement area of the stator
Data Source
AI summary
A split-type blade, a fluid drive device and a fluid drive proportional mixer. The split-type blade is used as a component of the fluid drive device to convert pressure energy of fluid into mechanical energy. The split-type blade comprises: one or more push rods, each push rod being suitable for being arranged on a rotor of the fluid drive device in a radially slidable manner; and two valve plates, the two valve plates being respectively mounted in parallel at two end portions of the push rods, and each valve plate extending outwards along the push rods to form the split-type blade having a running-through push rod structure. In this way, when the split-type blade drives the rotor to rotate under the effect of a fluid, the push rods of each split-type blade slide in a radial direction relative to the rotor.