High Pressure Pump Valve Seat Inner Outer Flow Paths
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Solution Overview
Problem
High pressure pumps face efficiency deterioration and potential cavitation due to gaps formed between valve seats and elements caused by wear from temperature changes or increased operation, leading to leakage and erosion issues.
Innovation Solution
The design incorporates a plunger, pump body, valve seat member with inner and outer flow paths, and movement limiting devices to maintain effective sealing and reduce valve lift requirements, increasing the cross-sectional area of the flow path and minimizing collision impact forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single valve element controls both inner and outer valve seats to reduce device complexity, then the structure is simpler, but gaps form between valve seats and elements due to wear from temperature changes or increased operations
Solution Approach 1:
The single valve element is divided into two separate valve elements: an inner valve element for controlling the inner valve seat and an outer valve element for controlling the outer valve seat. This segmentation allows each valve element to be independently adjusted and maintained, preventing gap formation due to wear while maintaining manageable structural complexity.
2Ease of operation
If the passage cross-sectional area is increased by adding outer flow path to reduce required valve lift, then valve acceleration and collision speed are reduced, but device complexity increases
Solution Approach 1:
The inner flow path is nested within the outer flow path, with the inner flow path having a smaller cross-sectional area and the outer flow path surrounding it. This nested configuration increases the total passage cross-sectional area without significantly increasing device complexity, as the inner flow path utilizes the existing valve element structure.
3Object-generated harmful factors
If valve element lift amount is reduced to lower collision impact force, then noise and vibration are reduced, but sealing reliability may be compromised
Solution Approach 1:
Different valve elements are designed with different lift amounts optimized for their specific functions. The inner valve element has a smaller lift amount to reduce collision impact force and noise, while the outer valve element has a larger lift amount to ensure reliable sealing. This local optimization allows each valve element to perform its function effectively without compromising overall sealing reliability.
Data Source
AI summary
A valve seat member, which partitions between a supply passage and a pressurizing chamber, includes an inner flow path, which communicates between the supply passage and the pressurizing chamber, and an outer flow path, which is placed on a radially outer side of the inner flow path. An inner valve is seatable against an inner valve seat formed in an opening of the inner flow path. An outer valve is contactable with an end surface of the inner valve, which is opposite from the inner valve seat. The outer valve is seatable against an outer valve seat, which is formed in an opening of the outer flow path.