Hydraulic Pump Sealing Ring Radial Force Compensation
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Solution Overview
Problem
Hydraulic pumps with axial or radial pistons experience significant leaks and friction losses between the supply face and distribution face, leading to reduced volumetric and energy efficiency, especially under high pressure and partial displacement operations.
Innovation Solution
A sealing ring with a continuous design housed in a ring groove, featuring a circumferential contact boss, compression-decompression track, and a radial force compensation groove, which reduces leakage and friction by maintaining a low-pressure seal and compensating for radial forces, allowing for efficient operation across various hydraulic pressures and fluid types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supply face and distribution face are kept in tight contact to reduce leaks, then sealing performance improves, but friction losses increase reducing energy efficiency
Solution Approach 1:
The distributor is segmented into separate components: a stator with a distribution face and a rotor with a supply face. These faces are positioned close to each other but not in direct contact, with a small clearance maintaining the seal while eliminating friction between the faces.
Solution Approach 2:
A fluid film or clearance acts as an intermediary between the supply face and distribution face, maintaining sealing while preventing direct contact. This intermediary layer eliminates friction losses while still preventing significant hydraulic fluid leakage.
2Reliability
If a small clearance is used between cylinders to achieve sealing, then manufacturing complexity increases, but leakage decreases
Solution Approach 1:
The distributor is divided into separate stator and rotor components that can be manufactured independently with standard tolerances. The segmentation allows for easier manufacturing while maintaining effective sealing through the designed clearance between components.
3Loss of energy
If radial force balancing grooves are added to counterbalance radial forces, then friction losses decrease, but device complexity increases
Solution Approach 1:
The distributor is segmented into separate stator and rotor components, eliminating the need for complex radial force balancing grooves within a single component. The separation of components inherently balances radial forces while maintaining simplicity.
4Device complexity
If the distributor uses a single integrated structure, then device complexity is low, but sealing performance deteriorates due to significant leaks
Solution Approach 1:
The distributor is segmented into separate stator and rotor components with precisely positioned supply and distribution faces. This segmentation enables effective sealing while maintaining relatively simple manufacturing and assembly processes.
Solution Approach 2:
The sealing approach transitions from radial sealing within a single component to axial positioning of separate components. The supply face and distribution face are positioned close together in the axial dimension, creating an effective seal while simplifying the overall structure.
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 sealing ring significantly reduces leakage and friction losses between suction and discharge ducts and the internal casing, enhancing the energy and volumetric efficiency of hydraulic pumps while maintaining robustness and a low cost, making it suitable for high-pressure applications and various pump configurations.
Implementation Method 1
at least one compression-decompression seal (28) which seals between the ring face on the stator side (23) and the bottom and/or the axial sides or radials of the ring groove (16)
Implementation Method 2
at least one circumferential contact boss (14) arranged axially or radially on either side of the distribution recess (21), said boss (14) having a circumferential contact line (15) able to come into contact with the low-pressure sealing surface on the rotor side (13)
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A sealing ring for a hydraulic pump distributor (i) for a hydraulic distributor (2) of a hydraulic pump (44), comprising a continuous sealing ring (11) housed in a ring groove (16) arranged in a pump stator (3) of which the inlet/discharge ports (7) are each aligned with a distribution recess (21) passing through said ring (11) from one side to the other in the direction of the thickness of same, the latter comprising a circumferential contact boss (14) that has a line of circumferential contact (15) that can come into contact with a low-pressure sealing surface on the rotor side (13), said ring (11) also comprising a compression/decompression track (24), a ring sealing lip (39) that provides a seal between said ring (11) and the ring groove (16), and rotation-stop means (36).