Rotary Piston Pump Sealing Chamber Seal Design
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Solution Overview
Problem
Rotary lobe pumps face challenges in maintaining the service life of bearings and drive components due to fluid and particle penetration under high pressure conditions, leading to reduced reliability and efficiency.
Innovation Solution
A sealing arrangement utilizing a sealing fluid pumping device with a barrier chamber, which creates a pressurized fluid barrier between the pump chamber and sensitive areas, using a sealing fluid that matches the lubricant of the components, and is controlled to maintain a pressure differential that prevents fluid leakage and particle ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional mechanical seals are used, then the structure is simple, but under high pressure conditions particles from pumped fluid penetrate the lubricant of bearings and synchronization gear, significantly reducing service life
Solution Approach 1:
The sealing system is segmented into distinct functional zones: the pump housing containing pumped fluid, the barrier chamber containing sealing fluid, and the drive compartment containing lubricated components. This segmentation allows each zone to be optimized independently - the barrier chamber acts as a protective buffer zone that isolates sensitive components from contaminated pumped fluid
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
This configuration ensures reliable sealing and extended service life of components by maintaining a controlled pressure differential, preventing fluid and particle penetration, even under high pressure conditions, thus enhancing the operational reliability and longevity of rotary lobe pumps.
Implementation Method 1
a fluid pressure difference is created between these inlet and outlet by the operation of the sealing fluid pumping device
Implementation Method 2
This sealing effect is achieved along the pump shaft... by creating a corresponding fluid pressure difference between the pump chamber and the barrier chamber
Data Source
Figure 1~2
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AI summary
The invention relates to a seal arrangement for saving a pump shaft in a rotary piston pump (10) designed for delivering pumped delivery fluid, comprising a sealing fluid pumping device (20) having a pump inlet (21) and a pump outlet (22), a sealing chamber (40), which is connected to the pump outlet (22) and is arranged adjacent to the pumping chamber of the rotary piston pump (10) and is sealed off with respect to the pumping chamber by means of a first shaft seal enclosing the pump shaft, wherein the sealing chamber (40) is loaded via the pump outlet (22) with a fluid pressure resulting from the fluid pressure difference generated by the sealing fluid pumping device (20), and, by means of interaction of this fluid pressure with the first shaft seal, seals off the pumping chamber against the escape of pumped delivery fluid from the pumping chamber along the pump shaft.