Mechanical Seal Case Structure for Shaft Vibration Tracking
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Solution Overview
Problem
Conventional mechanical seals face issues with reliable sealing due to shaft vibration, as the O-ring contacts the seal ring at two points, restricting movement, and increasing the axial length of rubber bellows for flexibility results in a larger device size.
Innovation Solution
A mechanical seal design featuring a case with a holding part that regulates the seal member's movement, allowing it to contact the stationary-side sealing ring at one point, with an axial gap for deformation absorption and an annular groove for comprehensive sealing, enabling the stationary-side sealing ring to follow the rotating-side sealing ring's movement while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the O-ring contacts the seal ring at two points (inner circumferential surface and end surface), then sealing is provided, but the seal ring is restrained from moving and cannot follow the mating ring movement, compromising sealing reliability
Solution Approach 1:
The invention extracts the sealing function from the O-ring and separates it from the movement regulation function. The O-ring is positioned only at the bottom of the annular case to seal between the case and mating ring, while the seal ring's axial movement is regulated by the annular groove structure rather than the O-ring, allowing the seal ring to follow mating ring movement while maintaining sealing reliability.
Solution Approach 2:
The sealing system is segmented into multiple functional components: the O-ring handles sealing between the case and mating ring, the annular groove regulates seal ring movement, and the protrusion structure provides additional sealing. This segmentation allows each component to perform its specific function without interfering with others, resolving the contradiction between sealing reliability and movement freedom.
2Reliability
If the axial length of the rubber bellows is increased to ensure flexibility and allow the stationary-side sealing ring to follow the rotating-side sealing ring movement, then sealing reliability is improved, but the device size increases
Solution Approach 1:
The invention introduces an intermediary elastic body structure that transmits movement from the rotating-side sealing ring to the stationary-side sealing ring without requiring a long axial bellows. This intermediary mechanism allows the stationary-side sealing ring to follow the movement of the rotating-side sealing ring while maintaining a compact axial length.
Solution Approach 2:
The seal ring is designed with dynamic movement capability through the annular groove structure, allowing it to move axially to follow the mating ring. This dynamic design eliminates the need for a long axial bellows while ensuring the stationary-side sealing ring can track the rotating-side sealing ring movement, maintaining sealing reliability in a compact form.
3Reliability
If the seal member is regulated from moving axially by the holding part, then the seal member contacts the stationary-side sealing ring at one point allowing it to follow movement, but the seal member may deform or swell in the axial direction
Solution Approach 1:
The invention provides beforehand cushioning by designing the holding part with an axial gap that can accommodate seal member deformation or swelling. This gap acts as a buffer that absorbs dimensional changes in advance, preventing the seal member from being overly constrained while still maintaining its sealing function and allowing the stationary-side sealing ring to follow movement.
Data Source
AI summary
The purpose of the present invention is to provide a mechanical seal in which a stationary-side sealing ring can follow the movement of a rotating-side sealing ring to provide reliable sealing properties and by which the entire device can be made compact.A mechanical seal in which a rotating-side sealing ring 13 attached to a shaft 2 and a stationary-side sealing ring 21 attached to a housing 3 slide relative to each other and seal between the housing 3 and the shaft 2 includes a case 22 which is attached to the housing 3 and which contains the stationary-side sealing ring 21, and a seal member 23 which is disposed between the case 22 and the stationary-side sealing ring 21, and the case 22 includes a holding part 22d which regulates the seal member 23 from moving to both sides in the axial direction thereof.