Curved Pump Ring Contact Surface for Orbital Pump Sealing
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Solution Overview
Problem
Existing pump devices, such as orbital pumps, face challenges in achieving high leak tightness and rapid pressure build-up while maintaining durability and functionality across a wide range of temperatures.
Innovation Solution
A pump device with a hydraulics housing, a deformable pump ring, and an eccentric driven by a controllable shaft, featuring a contact surface with a curvature that increases towards the ends, and made of elastomeric materials with specific Shore hardness and glass transition temperature, ensuring secure connections and optimal pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flat contact surface is used on the pump ring, then the structure is simple and manufacturing is easy, but the pressure distribution is non-linear and leak tightness is insufficient
Solution Approach 1:
The contact surface of the pump ring is designed with a curved contour instead of a flat surface. The curvature increases towards the ends of the contact surface, creating a non-uniform pressure distribution that improves sealing performance and leak tightness while maintaining structural simplicity
Solution Approach 2:
The contact surface features variable curvature along its length, with higher curvature at the ends and lower curvature in the middle section. This local variation in geometry optimizes pressure distribution differentially across the contact surface, enhancing sealing at critical regions without requiring complex overall structure
2Productivity
If the pump ring is pressed uniformly against the hydraulics housing, then the structure is simple, but pressure build-up is slow and leak tightness is reduced
Solution Approach 1:
The curved contact surface profile works in conjunction with the eccentric pressing mechanism to achieve non-uniform pressure distribution. The curvature variation ensures that pressure is concentrated at the ends of the contact surface where sealing is most critical, enabling rapid pressure build-up and improved leak tightness
Solution Approach 2:
The eccentric mechanism creates dynamic, non-uniform pressing of the pump ring against the hydraulics housing during operation. This dynamic pressing action, combined with the curved contact surface, ensures optimal pressure distribution that accelerates pressure build-up while maintaining simplicity in the pressing mechanism
3Strength
If elastomeric material with high Shore hardness is used for the pump ring, then durability and pressure resistance are improved, but start-up behavior at low temperatures deteriorates
Solution Approach 1:
The elastomeric material is selected with specific parameter ranges: Shore hardness between 40-70 and glass transition temperature between -50°C to 0°C. These parameter specifications balance the competing requirements of pressure resistance (requiring higher hardness) and low-temperature flexibility (requiring lower glass transition temperature), enabling both durability and reliable start-up behavior across a wide temperature range
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 achieves high leak tightness, rapid pressure build-up, and extended service life, with improved start-up behavior at low temperatures, enhancing the overall performance of the pump device.
Implementation Method 1
The pump ring (14), which is also referred to as a diaphragm, is thereby deformable and defines, at least in certain regions, a pump chamber
Implementation Method 2
the curvature increases, at least in some portions, towards the ends of the contact surface... achieves linearization of the distribution of pressure on the contact surface
Data Source
AI summary
A pump device for pumping a liquid, has a hydraulics housing (12), in which a pump ring (14) with a contact surface (46), a pump ring support (16) and an eccentric (18), which can be driven by a shaft (20), are accommodated. The hydraulics housing (12) has an annular portion (22) and a first and a second lateral section (24, 26), the two lateral sections (24, 26) being arranged opposite each other. The pump ring (14) is mounted between the two lateral sections (24, 26) of the hydraulics housing (12) at least in some portions. The profile of the contact surface (46) has a contour with a curvature that changes at least in portions, and specifically in such a way that the curvature increases at least in some portions towards the ends of the contact surface (46).