External Pulsation Damper for Compact Fuel Pump
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Solution Overview
Problem
Existing fuel pump designs face challenges in reducing pressure pulsation noise and preventing wear in piping components, leading to increased pump body size due to the need for a large housing chamber for the pulsation damper.
Innovation Solution
A pulsation damper system with a diaphragm that is elastically deformed by fuel pressure, housed in a separate casing part attached to the pump body via a communication passage, allowing the housing chamber to be external to the pump body, thus minimizing the pump body's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a housing chamber is formed in the pump body to house the diaphragm of the pulsation damper, then pressure pulsation of fuel can be reduced, but the size of the pump body is increased
Solution Approach 1:
The pulsation damper is segmented from the pump body into a separate attachable component. The damper includes its own housing chamber formed in a casing part, which is attached to the pump body via a communication passage. This segmentation allows the pump body to maintain its original compact size while the pulsation damper housing chamber provides the necessary volume for pressure pulsation reduction.
Solution Approach 2:
The housing chamber for the pulsation damper is relocated from the internal three-dimensional space of the pump body to an external attachment position. By forming the housing chamber in a separate casing part that attaches to the pump body, the design utilizes external spatial dimensions rather than consuming internal pump body volume, thereby resolving the contradiction between reducing pressure pulsation and maintaining compact pump body size.
2Reliability
If a large housing chamber is formed in the pump body to accommodate the diaphragm, then the pulsation damper can function effectively, but the pump body requires a larger size
Solution Approach 1:
The housing chamber is extracted from the pump body structure and placed in a separate casing part. The casing part with the housing chamber attaches to the pump body through a communication passage, allowing the pulsation damper to function with an adequate housing chamber volume without increasing the pump body size. This extraction resolves the contradiction by separating the functional requirement from the structural constraint.
3Volume of stationary object
If the housing chamber is externalized to a separate casing part, then the pump body size is restricted, but an attachment structure is required
Solution Approach 1:
The attachment structure is merged with the communication passage that connects the fuel passage to the housing chamber. The attachment part includes the communication passage as an integrated component, so that the connection between the pump body and the pulsation damper housing chamber serves dual purposes: structural attachment and fluid communication. This merging reduces device complexity by combining multiple functions into a single integrated structure.
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
Effectively reduces pressure pulsation noise and prevents wear in piping components while maintaining a compact pump body size by externalizing the housing chamber, reducing the need for large internal chambers within the pump body.
Implementation Method 1
a diaphragm that is elastically deformed in a predetermined direction by receiving a pressure of fuel
Data Source
AI summary
A pulsation damper for a fuel pump having a pump body in which a fuel passage is defined includes: a diaphragm that is elastically deformed in a predetermined direction by receiving a pressure of fuel; a casing part including a housing chamber that houses the diaphragm; and an attachment to be attached to the pump body. The attachment includes a communication passage that makes the housing chamber to communicate with the fuel passage. The attachment has a length in a perpendicular direction perpendicular to the predetermined direction, and the length of the attachment is smaller than a length of the casing part in the perpendicular direction.