Differential Pressure Valve for Pump Barrier Fluid Regulation
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Solution Overview
Problem
Current pressure regulation systems for barrier fluids in pumping devices are complex, require many components, and suffer from material fatigue and delayed reaction times, making them unreliable for maintaining a pressure differential between the barrier fluid and the pumping medium.
Innovation Solution
A method and device using a differential pressure reducing valve and overflow valve to regulate the pressure of the barrier fluid, ensuring it remains above the pumping medium pressure, with a minimal number of components and direct mechanical activation, eliminating electronic delays and ensuring reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure/volume compensators are used for barrier fluid pressure regulation, then the barrier fluid pressure can be maintained, but the system becomes complicated with many components and connections
Solution Approach 1:
The invention extracts the essential function of pressure regulation from complex pressure/volume compensators and implements it through a simple differential pressure valve that directly compares barrier fluid pressure with pumping medium pressure, eliminating unnecessary components while maintaining reliability
Solution Approach 2:
The differential pressure valve automatically regulates barrier fluid pressure by self-comparing pressures and activating the pump only when needed, eliminating the need for complex electronic control systems and continuous monitoring components
2Reliability
If pressure/volume compensators are used, then pressure regulation is achieved, but elastic partition walls are vulnerable to material fatigue
Solution Approach 1:
The invention replaces the mechanical elastic partition wall system with a differential pressure valve mechanism that uses direct pressure comparison and mechanical force balance, eliminating material fatigue issues while maintaining stable pressure regulation
Solution Approach 2:
The invention uses hydraulic pressure comparison through the differential pressure valve, where the valve directly senses pressure differences between barrier fluid and pumping medium, replacing fragile elastic membranes with robust hydraulic sensing
3Reliability
If electro-hydraulic pressure valves are used, then pressure regulation is achieved, but electronic pressure sensors and control cause delays in reaction time
Solution Approach 1:
The invention replaces electro-hydraulic valves with electronic sensors and control delays with a purely mechanical differential pressure valve that responds instantaneously to pressure differences, eliminating electronic signal processing time while maintaining precise pressure regulation
Solution Approach 2:
The differential pressure valve performs automatic pressure comparison and activation without electronic intermediaries, creating a direct mechanical response path that eliminates sensor and control delays while maintaining regulation precision
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 maintains a consistent pressure difference with a reduced component count, ensuring rapid reaction times and high reliability by using purely mechanical components, preventing leakage and maintaining system integrity.
Implementation Method 1
the pressure of the supplied barrier fluid is increased when a pressure difference between the pressure of the supplied barrier fluid and a detected pressure of the pumping medium in the pump unit falls below a pre-determined value
Implementation Method 2
a shaft sealing arrangement, which seals the pump housing relative to the shaft
Implementation Method 3
the pressure of the barrier fluid in the housing or in the pressure container is higher than the pressure of the pumping medium in the pump unit in order to avoid the pumping medium from escaping into the housing or into the pressure container
Data Source
AI summary
A method for the pressure regulation of a barrier fluid in a pumping device (10) is introduced, which includes a pump unit (11) with a shaft (12) and a pump housing (13), a drive unit (17), which is mechanically coupled to the pump unit and a shaft sealing arrangement (16.1, 16.2), which seals the pump housing (13) relative to the shaft (12). In the method, a pumping medium is pumped by means of the pumping device (10) and the barrier fluid is conveyed via a feed line (5.1, 5.2) to a common housing (18), in which the pump unit (11) and the drive unit (17) are arranged, in order to prevent a leakage of the pumping medium out of the pump housing (13). Additionally, the pressure of the supplied barrier fluid is increased when a pressure difference between the pressure of the supplied barrier fluid and a detected pressure of the pumping medium in the pump unit (11) falls below a pre-determined value. For this purpose a pressure reducing valve (1) for the differential-pressure is opened and the feed line is connected through to a source (3, 4) for the barrier fluid via the open valve, the pressure of which lies by more than the pre-determined value above the pressure of the pumping medium in the pump unit.