Diamond-Coated Floating Ring Seal for Thermal Distortion Control
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Solution Overview
Problem
Floating ring type mechanical seals face thermal distortion issues due to temperature differences between the sealing surface and the rear surface of the rotary ring, leading to potential deterioration of the sealing function under high-load conditions.
Innovation Solution
A diamond film with high thermal conductivity is formed on the sealing surface and continuously extended to the outer or inner peripheral surface and rear surface of the rotary ring, effectively transmitting friction heat and mitigating temperature differences, thereby preventing thermal distortion and maintaining parallelism of the sealing surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a floating ring type mechanical seal is used under high-load conditions (PV ≥ 20 MPa/m/s), then the sealing function is initially satisfactory due to balanced pressure distortion, but thermal distortion occurs in the rotary ring due to temperature difference between sealing surface and rear surface, leading to deterioration of sealing function
Solution Approach 1:
A heat transfer ring made of material with high thermal conductivity is introduced as an intermediary component between the sealing surface and the rear surface of the rotary ring. This heat transfer ring acts as a thermal conduit that rapidly conducts friction heat from the sealing surface to the rear surface, reducing the temperature difference and preventing thermal distortion that would otherwise compromise the sealing function
Solution Approach 2:
The thermal conductivity parameter of the rotary ring structure is changed by introducing a heat transfer ring with high thermal conductivity material. This parameter change enables rapid heat transmission across the rotary ring thickness, fundamentally altering the thermal distribution pattern from localized heating to uniform heat dissipation, thereby preventing thermal distortion
2Strength
If the sealing surface and rear surface of the rotary ring are far apart to accommodate high-load operation, then the sealing function is maintained under balanced pressure, but the temperature difference between surfaces increases, causing thermal distortion
Solution Approach 1:
The heat transfer ring serves as a thermal intermediary that bridges the gap between the sealing surface and rear surface. By providing a high thermal conductivity pathway through this intermediary component, the system can maintain the necessary structural thickness for load bearing while simultaneously enabling efficient heat transmission to prevent thermal distortion
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 ensures stable sliding characteristics over a long period even under high-load conditions by promptly transmitting friction heat and reducing thermal distortion, ensuring the sealing function remains effective.
Implementation Method 1
a diamond film which has a large thermal conductivity is formed on the sealing surface sliding on the floating ring in the rotary ring and a diamond film continuous to the diamond film of the sealing surface is formed on an outer peripheral surface and a rear surface
Data Source
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AI summary
Provided is a floating ring type mechanical seal in which a floating ring is pinched and held between a rotary ring provided in a rotary shaft and a stationary ring provided in a seal casing to be movable in an axial direction while being urged toward the rotary ring so that a relative rotation of the floating ring with respect to the stationary ring is inhibited. The rotary ring is made of a sintered compact of SiC or cemented carbide. A diamond film is formed on a sealing surface sliding on the floating ring in the rotary ring. A diamond film continuous to the diamond film of the sealing surface is formed on an outer peripheral surface of the rotary ring and a rear surface, which is a surface opposite to the sealing surface, in the rotary ring.