Mechanical Seal Packing Segmentation for Heat and Displacement
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Solution Overview
Problem
Mechanical seal devices under high pressure or varying pressure suffer from seal surface displacement and heat accumulation, leading to fluid leaks, deformation, and fatigue, due to the elastic deformation of rubber-like gaskets and inefficient heat transfer.
Innovation Solution
A mechanical seal device with a packing made of rubber-like material, featuring an annular form with a contact surface, adhesion surface, and insertion nose end portion, securely engages with the seal housing, preventing seal surface displacement and effectively transferring heat to the housing, thereby maintaining seal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber-like gasket is used to seal between the seal housing and seal ring, then sealing capability is improved, but the gasket undergoes elastic deformation under high pressure causing seal surface displacement and fluid leakage
Solution Approach 1:
The gasket is divided into two functional parts: an elastic sealing portion for sealing and a rigid positioning portion for maintaining seal surface position. This segmentation allows each part to perform its specific function without interfering with the other, resolving the contradiction between sealing capability and position accuracy.
Solution Approach 2:
Different parts of the gasket are given different mechanical properties: the sealing portion is made elastic to conform to surfaces and prevent leakage, while the positioning portion is made rigid to resist deformation and maintain seal surface alignment under pressure.
2Reliability
If the gasket fully occupies the space between seal housing and seal ring, then sealing is improved, but frictional heat cannot be transferred to the seal housing causing heat accumulation and thermal stress
Solution Approach 1:
The gasket structure separates the sealing function from the heat transfer path. The rigid positioning portion creates a thermal conduction path to the seal housing, allowing heat to escape while the elastic sealing portion maintains the seal.
Solution Approach 2:
The rigid positioning portion of the gasket acts as a thermal intermediary, conducting heat from the seal ring to the seal housing, thereby preventing heat accumulation in the sliding interface while maintaining sealing integrity.
3Reliability
If the gasket is made of elastic material to provide sealing, then sealing performance is improved, but the gasket fatigues due to frictional heat causing degradation of seal performance
Solution Approach 1:
The gasket is segmented into an elastic sealing portion that maintains sealing performance and a rigid positioning portion that provides thermal stability. This division protects the elastic material from thermal fatigue by separating it from the heat generation zone.
Solution Approach 2:
The rigid positioning portion is strategically placed to provide thermal management and structural support, while the elastic sealing portion is protected from excessive thermal exposure, extending the overall service life of the gasket assembly.
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 seal performance by preventing seal surface displacement and heat accumulation, reducing fluid leaks and preventing deformation or cracking of the seal surfaces, while enhancing the durability of the packing material.
Implementation Method 1
the packing is made of rubber-like resilient material... obtained when the packing is plunged into the cavity portion
Implementation Method 2
frictional heat of the seal ring which is generated in sliding movement can hardly be transferred to the seal housing... causes an accumulation of the generated heat
Data Source
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AI summary
A mechanical seal device capable of preventing a sealing ability from being lowered by the irregular displacement of the seal surface of a sealing ring and by the deterioration of a packing for sealingly fitting the sealing ring by heat generated due to its slidable contact with the sealing ring. The mechanical seal device comprises the rubberlike elastic material annular packing having a joining face fitted peripheral surface (inner peripheral surface) of a stepped hole and an adhesive face on the inner peripheral side of the joining face and having an insertion tip part at its insertion tip inserted into the fitting peripheral surface and the sealing ring for fixing having a fitting surface joined to the adhesive face of the packing, a rear surface fitted to the support face (bottom face) of the stepped hole, and a seal surface on the opposite side of the rear surface. With the rear surface joined to a support surface, a space part is formed between the insertion tip part and the opposite surface thereto on the support surface side. The packing is inserted into the space part to fit the rear surface onto the support face by the elastic force of the packing.