Stuffing Box Flow Diverter with Coaxial Passages
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Solution Overview
Problem
Existing flush systems for industrial pumps excessively dilute the product being pumped by using a large quantity of flush water, which requires additional expense and environmental impact for removal, while failing to maintain proper stuffing box pressure.
Innovation Solution
A stuffing box flow diverter with coaxial passages and a flow limiter that allows for reduced flush water usage by circulating and controlling the flow of fluid through the same stuffing box port, using a tube with an annular passage and adjustable length, and incorporating a flow control valve and check valve to manage fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large quantity of flush water is injected into the stuffing box under pressure via a single port, then the stuffing box pressure is maintained and cooling and lubrication of the compression packing is provided, but the product being pumped is excessively diluted
Solution Approach 1:
The single flush water injection system is segmented into two separate passages: a first passage for injecting flush water under pressure to maintain stuffing box pressure, and a second passage for receiving and removing flush water. This segmentation allows independent control of flush water injection and removal, enabling reduced overall flush water quantity while maintaining proper stuffing box pressure for reliable operation.
Solution Approach 2:
The system recovers and reuses flush water by capturing it through the second passage before it can dilute the pumped product. The recovered flush water can be redirected back to the first passage for reuse, reducing the total quantity of fresh flush water needed while maintaining continuous cooling and lubrication of the compression packing.
2Reliability
If flush water is used to cool and lubricate the compression packing, then the stuffing box operates reliably, but the flush water must be removed later at additional expense and environmental impact
Solution Approach 1:
The second passage is specifically designed to recover flush water at the point where it exits the stuffing box, capturing it before it mixes with the pumped product. This recovery system eliminates the need for expensive and environmentally impactful removal processes by redirecting the flush water back into the system through the first passage, maintaining continuous cooling and lubrication of the compression packing while eliminating waste disposal costs.
3Reliability
If the tube length is increased to improve fluid distribution, then the flush water coverage is improved, but the device complexity increases
Solution Approach 1:
The tube length is made adjustable rather than fixed, allowing dynamic optimization for different applications. The tube can be extended or trimmed to the appropriate length based on specific stuffing box configurations and fluid distribution requirements, providing flexibility to achieve reliable fluid distribution without unnecessarily increasing device complexity. This dynamic adjustment capability allows the same basic design to adapt to various installation scenarios.
Data Source
AI summary
A stuffing box flow diverter including a body including first, second, and third connector portions. The third connector portion is configured for connection to a stuffing box. A first passage extends from the first connector portion to the third connector portion and a second passage extends from the first connector portion to the third connector portion. The first and second passages are coaxial, wherein the second passage includes an annular portion extending along at least a portion of the first passage. The first passage is defined by a tube extending from the first connector portion and through a bore formed in the third connector portion, the bore having a bore diameter larger than an outer diameter of the tube. The second passage includes the annular region defined by the bore diameter and the outer tube diameter.