Exhaust Pump Mounting with Compressible O-Ring Damping
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Solution Overview
Problem
Existing mounting arrangements for exhaust system pumps fail to securely attach the pump to the exhaust pipe without allowing leakage of exhaust gases and effectively dampen vibrations, leading to noise amplification and heat transfer issues.
Innovation Solution
A mounting arrangement using a boss attached to the exhaust pipe with compressible O-ring members that retain the pump, providing a non-rigid interface to prevent gas leakage and vibration transmission, while also reducing heat transfer through the use of polymeric materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pump is mounted directly on the exhaust pipe with rigid contact, then secure attachment and sealing are achieved, but vibrations are transmitted to the exhaust pipe causing noise amplification
Solution Approach 1:
A compressible member (such as an O-ring) is introduced as an intermediary element between the pump and the exhaust pipe. This intermediary provides both sealing functionality and vibration damping, allowing the pump to be securely attached while preventing vibration transmission to the exhaust pipe structure.
Solution Approach 2:
The mounting interface changes from rigid to compliant by using a compressible member. This parameter change allows the system to maintain secure attachment through compression while simultaneously damping vibrations and reducing noise amplification.
2Reliability
If the pump is mounted directly on the exhaust pipe with rigid contact, then secure attachment is achieved, but heat transfers from the exhaust pipe to the pump
Solution Approach 1:
The compressible member serves as a thermal intermediary that provides thermal insulation between the hot exhaust pipe and the pump. This intermediary blocks direct heat conduction paths while still maintaining mechanical attachment and sealing functions.
Solution Approach 2:
The mounting interface changes from thermally conductive (rigid metal-to-metal contact) to thermally insulating (compliant polymeric material contact). This parameter change reduces heat transfer to the pump while maintaining secure attachment through compression.
3Object-generated harmful factors
If a compressible member is used to damp vibrations, then acoustic decoupling is achieved, but the connection between pump and exhaust pipe is non-rigid
Solution Approach 1:
The compressible member is positioned in the critical sealing interface between the pump and exhaust pipe. This intermediary provides vibration damping and acoustic decoupling while maintaining sufficient mechanical stability for secure attachment and sealing functionality.
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 effectively secures the pump, reduces noise amplification by damping vibrations, and minimizes heat transfer, ensuring efficient and reliable operation by maintaining acoustic and thermal decoupling between the pump and the exhaust pipe.
Implementation Method 1
The retaining means comprises at least one compressible member for damping vibration of the pump
Implementation Method 2
The retaining means also comprise means for reducing heat transfer from the exhaust pipe to the pump
Implementation Method 3
the retaining means also serves to reduce heat transfer by conduction from the exhaust pipe to the pump, for example when the retaining means is of a polymeric material such as rubber
Data Source
Figure 1
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AI summary
A mounting arrangement (28) for attaching a pump (10) to an exhaust pipe (12), the mounting arrangement comprising a boss (30) attached or attachable to the exhaust pipe (12), and retaining means (34, 46, 48) for retaining the pump in the boss (30), in use, characterised in that the retaining means comprise means (46, 48) for damping vibration of the pump (10). Preferably, the retaining means further comprise means (46, 48) for reducing heat transfer from the exhaust pipe (12) to the pump (10).