Hydraulic Gear Pump Radial Pressure Compensator
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Solution Overview
Problem
Gear pumps face challenges in preventing leakage due to gear clearance and pressure variations, which affect efficiency and performance, despite high manufacturing tolerances, and existing solutions do not dynamically adjust for these issues during operation.
Innovation Solution
A hydraulic gear pump with a radial pressure compensator, featuring a crescent seal assembly with spring cavities, check valve cavities, and check pins that radially separate and reposition the crescents to prevent leakage in both directions, allowing bi-directional operation and reducing radial clearances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tight mechanical clearances are used to prevent leakage, then leakage is reduced, but manufacturing cost increases and wear over time causes leakage to occur
Solution Approach 1:
The patent employs a dynamic pressure compensator mechanism that automatically adjusts the radial clearance between gear elements based on operating pressure conditions. The compensator includes a movable member that responds to pressure differential forces, dynamically modifying the clearance to maintain optimal sealing performance without requiring extremely tight manufacturing tolerances. This dynamic adjustment allows the system to compensate for wear and pressure variations over time.
Solution Approach 2:
The invention changes the clearance parameter dynamically rather than fixing it at a tight tolerance during manufacturing. The pressure compensator mechanism allows the radial clearance to vary with operating conditions, transforming a static manufacturing tolerance problem into a dynamic operational parameter that can be adjusted to maintain reliable leakage prevention across the product lifecycle.
2Ease of manufacture
If fixed displacement gear pump configuration is used, then manufacturing is simplified, but adaptability to different pressure conditions and bi-directional operation is limited
Solution Approach 1:
The patent integrates multiple functions into the gear pump configuration. The pressure compensator mechanism serves both to maintain sealing performance under varying pressure conditions and to enable bi-directional operation. The crescent-shaped seal members and check valve arrangement work together to provide pressure compensation while allowing the pump to operate efficiently in either rotational direction, achieving multi-functionality without significantly complicating the overall design.
Solution Approach 2:
The invention introduces dynamic elements including movable pressure compensator members and spring mechanisms that automatically adjust to operating conditions. This dynamic configuration allows the pump to adapt to different pressure scenarios and operational directions while maintaining a relatively simple overall structure, resolving the contradiction between manufacturing simplicity and operational versatility.
3Reliability
If radial clearance is reduced to prevent leakage, then sealing performance improves, but the ability to dynamically adjust for wear and pressure variation is lost
Solution Approach 1:
The patent implements a dynamic pressure compensator that continuously adjusts the radial clearance between gear elements based on real-time pressure differential conditions. The movable compensator member responds to pressure forces and spring bias, automatically modifying the sealing clearance to maintain optimal performance. This dynamic mechanism ensures that the system adapts to wear, pressure variations, and operational changes without requiring extremely tight fixed tolerances.
Solution Approach 2:
The pressure compensator mechanism incorporates a feedback system where pressure differential forces directly influence the position of the compensator member, which in turn adjusts the radial clearance. This closed-loop feedback ensures that the sealing performance automatically adapts to changing operating conditions, maintaining reliable leakage prevention while providing dynamic adjustment capability throughout the product lifecycle.
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 effectively seals high-pressure chambers from low-pressure chambers, reducing leakage and enhancing the gear pump's efficiency and versatility by enabling bi-directional operation and regenerative modes.
Implementation Method 1
a spring disposed in the at least one spring cavity such that the spring pushes the outer crescent and the inner crescent radially apart
Implementation Method 2
a first check pin disposed in the first check valve cavity and configured to preclude leakage fluid flow between the outer crescent and the inner crescent in a first direction during operation of the gear pump
Data Source
AI summary
An example crescent seal assembly comprises: an outer crescent of a gear pump; an inner crescent of the gear pump mating with the outer crescent such that an exterior peripheral surface of the inner crescent interfaces with an interior peripheral surface of the outer crescent, forming: (i) a spring cavity, (ii) a first check valve cavity, and (iii) a second check valve cavity therebetween; a spring disposed in the at least one spring cavity; a first check pin disposed in the first check valve cavity; and a second check pin disposed in the second check valve cavity.