Rotary Pump Axial Compensation Sealing
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Solution Overview
Problem
Existing rotary pumps face challenges in sealing pressure outlets effectively due to component and installation tolerances, temperature-induced changes, and pressure-induced movements, leading to leaks and reduced efficiency.
Innovation Solution
A rotary pump design featuring a pump housing with a rotor that forms delivery cells, an outlet gasket for sealing pressure outlets, and a pressing device that axially moves the pump housing or outlet gasket to maintain a sealed connection with the accommodating device, compensating for tolerances and movements through axial guidance and hydraulic or spring-based pressing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed sealing arrangement is used at the pressure outlet, then the structure is simple, but sealing reliability deteriorates due to component tolerances, temperature changes, and pressure-induced movements
Solution Approach 1:
The sealing arrangement is made dynamic by allowing the pump housing to move axially relative to the accommodating device. The outlet gasket maintains sealing contact through this axial movement, compensating for dimensional changes and tolerance variations. The pressing device continuously applies axial force to ensure the gasket remains in sealing contact despite pressure fluctuations and thermal expansion.
Solution Approach 2:
The system exploits parameter changes caused by temperature and pressure to enable axial movement of the pump housing. Thermal expansion and pressure-induced deformation are not resisted but rather utilized to drive the axial displacement that maintains optimal sealing contact between the outlet gasket and the accommodating device.
2Reliability
If axial compensation mechanisms are added to compensate for tolerances and temperature changes, then sealing reliability improves, but device complexity increases
Solution Approach 1:
The axial compensation mechanism is self-regulating. The pressing device automatically adjusts the axial position of the pump housing or outlet gasket based on real-time sealing requirements. The system uses the pressure differential and thermal expansion naturally present in operation to drive the compensation action without requiring external control systems or complex actuation mechanisms.
Solution Approach 2:
The outlet gasket serves as an intermediary element between the pump housing and the accommodating device. It translates axial movements into effective sealing contact, absorbing dimensional variations and tolerance mismatches. The gasket material properties allow it to deform and conform to mating surfaces while maintaining the seal under varying operational conditions.
3Reliability
If the pump housing is made axially movable to compensate for pressure-induced movements, then sealing performance improves, but structural stability deteriorates
Solution Approach 1:
The system separates the sealing function from the structural support function. The outlet gasket handles the sealing task through axial movement, while the pump housing maintains its structural integrity and load-bearing capabilities. This segmentation allows the housing to be relatively stable structurally while permitting controlled axial displacement for sealing purposes.
Solution Approach 2:
The outlet gasket acts as a flexible sealing element that accommodates axial movements. Its material properties allow it to deform and maintain sealing contact during pump housing displacement, while the rigid pump housing provides structural stability. The flexible gasket absorbs the mechanical stress of axial movement without compromising the overall structural integrity of the pump assembly.
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 ensures reliable sealing of pressure outlets, maintaining efficiency and performance across varying conditions, including temperature changes and pressure fluctuations, by using a combination of axial movement and pressing forces to maintain a secure seal.
Implementation Method 1
A spring device which is arranged in the pressure space tenses the pump insert axially against the cover
Implementation Method 2
A pressing device for charging the outlet gasket with a pressing force
Implementation Method 3
an outlet gasket which is provided for sealing off the pressure outlet on the outer end-face side of the first end-face wall
Data Source
AI summary
A pump for supplying an assembly with a pressure fluid, the pump including: a pump housing including a circumferential wall, surrounding the pump's, a first end-face wall and a second end-face wall which delineate the delivery chamber at its end-face sides; a rotor, rotatable about an axis of rotation in the delivery chamber, for forming delivery cells; a pressure outlet which emerges on an outer end-face side of the first end-face wall facing away from the delivery chamber and through which pressure fluid can be discharged from the delivery chamber; an outlet gasket provided on the outer end-face side of the first end-face wall, for sealing off the pressure outlet; a holder in a holding engagement with the outlet gasket and which positions the circumferential wall and the end-face walls relative to each other and axially holds them together as a pre-fitted fitting unit by the holding engagement.