Cryogenic Valve Body Counterbore for Intake Efficiency
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Solution Overview
Problem
Existing reciprocating pumps face challenges in efficiently increasing the intake and discharge efficiency of cryogenic liquefied gas due to significant pressure differences between intake and discharge valves, which can lead to vaporization of the liquid fuel.
Innovation Solution
A fluid intake/discharge valve body with a valve seat body, including a supply portion and an exhaust portion, where the intake and discharge valves are biased against these portions, and a counterbore surrounding the intake holes to reduce pressure differences by altering the surface area ratios, thereby improving the efficiency of liquid fuel intake and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pressure difference between intake and discharge valves is reduced, then the volumetric efficiency of liquid fuel intake and discharge is improved, but the valve operation control becomes more difficult
Solution Approach 1:
The patent applies local quality by creating a counterbore (recessed portion) at a specific location on the valve seat body where the intake valve contacts it. This localized structural modification changes the pressure distribution characteristics specifically at the intake valve region, allowing the intake valve to open at a smaller pressure difference compared to the discharge valve, thereby improving volumetric efficiency while maintaining distinguishable valve operation characteristics.
2Reliability
If the pressure difference is significantly reduced, then vaporization of liquid fuel is prevented, but the valve response time increases
Solution Approach 1:
The counterbore structure creates a localized pressure relief zone that reduces the pressure difference threshold for valve opening. This allows the intake valve to respond quickly with minimal pressure difference (preventing vaporization) while the discharge valve maintains normal response characteristics, thus balancing reliability improvement with acceptable response time.
3Productivity
If the valve seat structure is modified to reduce pressure difference, then the intake efficiency is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent modifies the valve seat body by adding a counterbore (recessed portion) with specific dimensional parameters. This parameter change creates a localized volume that alters pressure distribution characteristics, improving intake efficiency by reducing the pressure difference required for valve opening, while remaining manufacturable through standard machining operations.
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 reduces pressure differences at the start of valve operation, enhancing the volumetric efficiency of liquid fuel intake and discharge, preventing vaporization and improving overall pump performance.
Implementation Method 1
a counterbore that is a recessed portion disposed on the dividing wall, the counterbore surrounding the plurality of intake holes, and the counterbore configured such that the intake valve abuts an edge of the recessed portion in a case where the intake valve is biased against the fluid supply portion
Data Source
AI summary
A fluid intake/discharge valve body for suction of a cryogenic liquefied gas fluid into a cylinder liner and discharge of the gas fluid with a piston, includes: a valve seat body including a fluid supply portion to supply the fluid and a fluid exhaust portion; an intake valve biased against the fluid supply portion; and a discharge valve biased against the fluid exhaust portion. The fluid supply portion includes a supply pathway connected to a supply pipe; a dividing wall including intake holes facing the intake valve; and a counterbore recessed portion on the dividing wall to surround the intake holes. The intake valve abuts an edge of the recessed portion when biased against the fluid supply portion. The discharge valve receives fluid pressure from a side of the discharge hole including a recessed portion disposed in a region wider than an outer periphery of the discharge hole.