Mechanical Seal Coating for Uniform End-Face Cooling
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Solution Overview
Problem
Conventional end surface-contact mechanical seals suffer from uneven cooling of the seal portion due to single or multiple flushing liquid discharge holes, leading to thermal distortion and inadequate sealing performance, especially under high-pressure or high-speed conditions.
Innovation Solution
The implementation of diamond coating layers on the sealing rings' surfaces with higher heat conduction coefficients and hardness, ensuring uniform cooling across the entire periphery by dispersing heat generated from sliding contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single flushing liquid discharge hole is provided in the seal case, then the device complexity is reduced, but the cooling uniformity of the seal portion deteriorates
Solution Approach 1:
The patent applies local quality by providing multiple flushing liquid discharge holes at different positions (first discharge hole at a first position, second discharge hole at a second position) to create localized cooling zones. This ensures that different regions of the seal portion receive adequate flushing liquid, achieving uniform cooling across the entire seal surface without requiring a complex overall structure.
2Stability of the object's composition
If multiple flushing liquid discharge holes are provided at different positions, then the cooling uniformity of the seal portion is improved, but the device complexity increases
Solution Approach 1:
The patent makes the seal case multi-functional by integrating multiple flushing liquid discharge holes directly into its structure. The seal case not only provides structural support and containment but also serves as the housing for the flushing liquid supply passage and multiple discharge holes, eliminating the need for separate cooling device components and reducing overall system complexity.
3Reliability
If the sealing rings are made of hard materials to resist wear and corrosion, then the durability is improved, but the heat conduction capability deteriorates
Solution Approach 1:
The patent employs composite material strategy by combining hard, wear-resistant materials (such as ceramic or carbide) with materials having high heat conduction capability in the sealing ring structure. This composite approach allows the sealing rings to simultaneously achieve excellent wear resistance and corrosion resistance while maintaining effective heat conduction to dissipate friction heat from the sealing surface contact.
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
This solution minimizes wear, heat generation, and thermal distortion, providing a durable and reliable mechanical seal with improved cooling efficiency, reducing the need for high-capacity cooling devices and lowering operational costs.
Implementation Method 1
coating layers, which are composed of a material having a higher heat conduction coefficient and hardness than the constituent material of the sealing rings
Implementation Method 2
a flushing means for discharging a flushing liquid from a flushing passage formed in the seal case toward the relative rotational sliding contact portions of the sealing rings
Data Source
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AI summary
An end surface-contact mechanical seal that is configured so as to seal by means of a relative rotational sliding contact action of sealing end surfaces (5a, 6a) which are opposing end surfaces of a fixed sealing ring (6), which is fixed to a rotating shaft (4), and a movable sealing ring (5), which is held by a seal case (3) so as to be movable in an axial direction, the mechanical seal being provided with a flushing means (8) for discharging a flushing liquid (F) from a flushing passage (81) formed in the seal case (3) toward the relative rotational sliding contact portions (5a, 6a) of the sealing rings (5, 6), wherein coating layers (9a, 10a) and (9b, 10b), which are composed of a material having a higher heat conduction coefficient and hardness than the constituent material of the sealing rings (5, 6), are formed continuously on portions of the surfaces of the sealing rings (5, 6) where the flushing liquid (F) makes contact with and on the sealing end surfaces (5a, 6a), and the relative rotational sliding contact portions (5a, 6a) of the sealing rings (5, 6) are configured to be uniformly and sufficiently cooled by the flushing liquid (F) for their entire periphery.