Wet Seal Chamber Pressure Compensation via Bladder
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Solution Overview
Problem
Centrifugal pump seals are prone to failure due to exposure to debris and incompatible fluids, and can overheat when not in use, leading to reduced lifespan and potential mechanical failures.
Innovation Solution
The implementation of a wet seal chamber with a resilient member and a separator that adjusts pressure based on fluid flow, using a lubricant to prevent damage and maintain seal integrity, and a bladder to manage pressure and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seal is exposed to fluid flowing through the pump chamber, then the seal can perform its sealing function, but the seal is damaged by debris and incompatible fluids reducing its lifespan
Solution Approach 1:
The pump is divided into two separate chambers: a pump chamber for fluid processing and a seal chamber for seal protection. The separator wall with controlled fluid communication creates distinct zones, allowing the seal to be isolated from harmful debris while maintaining operational functionality through regulated fluid flow.
Solution Approach 2:
A lubricant is introduced as an intermediary substance in the seal chamber to protect the seal from direct contact with harmful pumped fluids and debris. The lubricant acts as a protective medium that reduces friction and prevents contamination while allowing the seal to function effectively.
2Adaptability or versatility
If the pump runs without pumping fluid, then the pump can operate in dry conditions, but the seal overheats and fails
Solution Approach 1:
The seal chamber is pre-filled with lubricant before operation begins. This preliminary action ensures that the seal is already protected and cooled by the lubricant when the pump starts running in dry conditions, preventing overheating and failure during startup and shutdown cycles.
Solution Approach 2:
A bladder mechanism is used to dynamically manage pressure and fluid distribution in the seal chamber. During dry runs, the bladder maintains proper lubricant pressure and flow to the seal, ensuring continuous cooling and protection even when the pump chamber is not filled with pumped fluid.
3Stress or pressure
If a separator with disc and resilient member is used to transfer fluid pressure, then pressure compensation is achieved, but the device complexity increases
Solution Approach 1:
The resilient member (diaphragm) dynamically changes the volume of the seal chamber in response to pressure variations. As pressure in the pump chamber increases, the diaphragm deforms to adjust the seal chamber volume, automatically compensating for pressure changes without requiring complex mechanical linkages or control systems.
Solution Approach 2:
A flexible diaphragm is used as the separator between the pump chamber and seal chamber. This thin flexible film allows for simple yet effective pressure transfer and compensation, replacing what would otherwise require complex rigid mechanical pressure balancing mechanisms while maintaining seal protection.
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 extends seal lifespan by preventing fluid contact with harmful substances, maintaining seal integrity during dry runs, and reducing overheating risks, thereby enhancing pump reliability and runtime.
Implementation Method 1
The disc includes one or more slots through which fluid pressure from the pump chamber is transferred to the resilient member
Implementation Method 2
using a lubricant to prevent damage and maintain seal integrity
Implementation Method 3
a bladder to manage pressure and prevent overheating
Data Source
Figure 1
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Figure 4
AI summary
Some embodiments of the invention provide a pump including a pump chamber, a shaft at least partially positioned in the pump chamber, an impeller coupled to the shaft, and a seal coupled to the shaft. The pump also includes a wet seal chamber with a first fluid. The wet seal chamber can include a bladder that compresses to compensate for volumetric expansion of the first fluid. The wet seal chamber substantially prevents fluid from contacting the seal in order to prolong a life of the seal.