Seal Ring Assembly Layout to Reduce Packing Insert Resistance
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Solution Overview
Problem
Conventional sealing devices for flow control valves face challenges in smooth assembly due to insert resistance and rotation resistance attributed to the elasticity of the packing, which hinders accurate alignment and contact between the seal ring and valve rotor.
Innovation Solution
A sealing device design where the seal ring is inserted first into the housing, followed by the packing and then the spring means, eliminating the need for initial packing-induced resistance, with the seal ring's rear-end surface featuring a tapered or grooved packing mounting space to facilitate smooth assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the packing is mounted in advance on the packing mounting groove of the housing, then the sealing structure is prepared for assembly, but insert resistance and rotation resistance occur due to the elasticity of the packing, making assembly difficult
Solution Approach 1:
The packing mounting space is formed in advance on the seal ring, allowing the packing to be properly positioned before the seal ring is inserted into the housing. This preliminary preparation eliminates the need to mount packing on the housing groove first, thereby avoiding insert resistance and rotation resistance during assembly.
Solution Approach 2:
Instead of mounting the packing on the housing groove first (conventional approach), the invention inverts the sequence by forming the packing mounting space on the seal ring first, then inserting the seal ring with pre-positioned packing into the housing. This inversion eliminates the resistance issues caused by pre-mounted elastic packing.
2Manufacturing precision
If the packing is mounted in advance on the housing, then the sealing structure is prepared, but rotation resistance occurs when rotating the seal ring to align center axes
Solution Approach 1:
The packing is pre-positioned in the packing mounting space formed on the seal ring before insertion. This preliminary action ensures the packing does not interfere with the rotation of the seal ring during assembly, allowing smooth center axis alignment between the seal ring and valve rotor without rotation resistance.
3Ease of manufacture
If the seal ring is inserted after the packing is mounted on the housing, then the packing is in place, but insert resistance occurs due to packing elasticity
Solution Approach 1:
The invention inverts the conventional assembly sequence by first forming the packing mounting space on the seal ring, then inserting the seal ring with pre-positioned packing into the housing. This inversion eliminates insert resistance caused by the elasticity of packing that would otherwise be mounted on the housing groove first.
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 approach reduces insert and rotation resistance, simplifying the assembly process by allowing the seal ring to be accurately aligned and seated without the interference of packing elasticity, resulting in a more efficient and streamlined assembly of the sealing device.
Implementation Method 1
spring means disposed on the rear-end surface side of the seal ring to elastically bias the seal ring toward the front-end surface side
Data Source
AI summary
A sealing device includes: a housing; a seal ring configured to be axially displaceably inserted along an inner circumference of the housing, the seal ring including a front-end surface and a rear-end surface which defines packing mounting space; a packing configured to establish sealing between the housing and the seal ring, the packing being disposed in the packing mounting space; and spring means disposed on the rear-end surface side of the seal ring to elastically bias the seal ring toward the front-end surface side.