Rotating Union Seal Adaptation for Mixed Media
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Solution Overview
Problem
Existing rotating union designs face challenges in operating with both lubricating and non-lubricating media, often requiring multiple inlets, complex piping systems, and suffer from dry running issues leading to seal wear and contamination, especially when transitioning between media types.
Innovation Solution
A rotating union with a single inlet and a secondary elastic seal member, featuring a specific balance ratio between seal surfaces to engage or disengage based on media type, allowing for frictionless operation with compressible media and preventing dry running without external lubrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotating union uses multiple inlets to operate with both lubricating and non-lubricating media, then media compatibility is improved, but device complexity increases
Solution Approach 1:
The patent implements a single inlet port that serves multiple functions by using a spring-loaded seal assembly that can adapt to different media types. The seal assembly automatically adjusts its engagement based on pressure differential, enabling the same inlet to handle both lubricating and non-lubricating media without requiring separate piping systems for each media type.
Solution Approach 2:
The spring-loaded seal assembly automatically responds to pressure differential between the inlet and outlet sides, self-adjusting its position to engage or disengage based on the media being transported. This eliminates the need for external control systems or multiple manually-operated valves, allowing the system to self-adapt to different media types through a single inlet.
2Reliability
If a rotating union engages seal surfaces tightly to prevent leakage, then sealing performance is improved, but seal wear increases due to dry running
Solution Approach 1:
The patent employs a dynamic seal assembly where the non-rotating seal member is mounted on a spring-loaded carrier that can move axially. This dynamic configuration allows the seal engagement to vary automatically based on operating conditions: tight engagement when lubricating media is present, and reduced engagement when operating with non-lubricating or no media, thereby preventing dry running and extending seal life while maintaining sealing performance when needed.
Solution Approach 2:
The spring constant and pre-load of the spring assembly are specifically designed to create different effective seal pressures under different operating conditions. The system exploits pressure differential as a controlling parameter, where the spring force automatically adjusts the seal contact pressure based on the media pressure, optimizing both sealing performance and wear prevention.
3Duration of action of stationary object
If a rotating union separates seal surfaces to prevent dry running, then seal wear is reduced, but sealing performance deteriorates
Solution Approach 1:
The spring-loaded carrier allows the non-rotating seal member to dynamically adjust its position along the axial direction. When lubricating media is present, the media pressure pushes the carrier to engage the seal surfaces tightly for optimal sealing. When operating with non-lubricating or no media, the spring force automatically reduces engagement, creating a microscopic gap that prevents dry running while maintaining sufficient sealing for the application.
4Device complexity
If a rotating union uses a single inlet for both lubricating and non-lubricating media, then device complexity is reduced, but media differentiation capability is worsened
Solution Approach 1:
The spring-loaded seal assembly uses pressure differential feedback from the media flow itself to automatically differentiate between lubricating and non-lubricating media conditions. The spring constant is calibrated so that the presence of lubricating media creates sufficient pressure to overcome spring force and engage the seals, while non-lubricating or absent media allows spring force to reduce engagement. This passive feedback mechanism enables media type differentiation without additional sensors or control systems.
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 design enables efficient operation with both incompressible and compressible media through a single inlet, reducing seal wear, eliminating dry running, and minimizing mechanical contact, thus extending seal life and simplifying the system by reducing the number of parts and avoiding contamination.
Implementation Method 1
at least one operating spring member engageable with said non-rotating seal member to provide an opening force on said primary seal assembly to disengage said rotating and said non-rotating seal members from one another
Implementation Method 2
When incompressible media, such as water or oil-based coolant, is utilized, the net force engages the non-rotating seal surface with the rotating seal surface in the operated, pressurized condition
Implementation Method 3
When compressible media, such as air or gas-based coolant, is utilized, the net force separates the non-rotating and rotating seal surfaces of the primary seal assembly by a microscopic amount
Implementation Method 4
a secondary elastic seal member positioned about the carrier member and providing a seal between the carrier member and the housing
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
In a fluid coupling device operable with either compressible or incompressible coolant media, a housing (12) communicates with a rotor member (36). A primary seal assembly is comprised of a rotating seal member (32) mounted to the rotor member (36) and a non-rotating seal member (34) mounted to a tubular carrier member (16) within a counterbore of the housing (12). At least one operating spring member (26) provides an opening force to disengage the rotating and said non-rotating seal members (32, 34) from one another. A secondary seal member (20) provides a seal between the carrier member (16) and the housing (12). The primary seal assembly is structurally arranged to provide a predetermined gap between the rotating and non-rotating seal members (32, 34) when a compressible fluid coolant or no fluid coolant is directed through the media inlet (15) and to provide that the rotating seal member engages the non-rotating seal member when an incompressible fluid coolant is directed through the media inlet, with said primary seal assembly having a balance ratio greater than 0.67 when the opening force is imposed on the primary seal assembly.