Refueling Gun Negative Pressure Assembly Flow Gap
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Solution Overview
Problem
The existing refueling gun technology is hindered by the limited service life of film-structured check valves, which leads to inefficient oil flow and prolonged refueling times due to the slow flow of oil through a single check valve.
Innovation Solution
The refueling gun design incorporates a negative pressure generating assembly with a disk, limiting members, and a sealing ring that reciprocates to form a gap for oil flow, replacing the conventional film-structured check valve to enhance oil flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a film-structured third check valve is used on the squeezing disk, then the oil can flow from the upper portion to the lower portion of the pump body, but the refueling time is prolonged due to limited flow speed and short service life
Solution Approach 1:
The single third check valve is segmented into multiple check valves (first check valve, second check valve, third check valve) arranged in parallel. This segmentation increases the total flow area for oil to pass from the upper to lower portion of the pump body, thereby increasing flow speed and reducing refueling time while maintaining reliability through distributed valve structures
Solution Approach 2:
The check valves are arranged in a radial direction (circumferential distribution) rather than a single linear position. This dimensional change from a single-point valve to a distributed radial arrangement increases the effective flow area and allows oil to flow through multiple parallel paths simultaneously, resolving the contradiction between flow speed and valve durability
2Productivity
If a single third check valve is used for oil flow, then the structure is simple, but the oil flow speed is limited causing prolonged refueling time
Solution Approach 1:
The single check valve function is segmented into multiple check valves working in parallel. Each valve handles a portion of the total oil flow, collectively achieving high flow rate while maintaining individual valve simplicity. The segmented arrangement increases productivity without requiring complex individual valve designs
Solution Approach 2:
Multiple simple check valve structures are merged into a single functional unit on the squeezing disk. The valves are distributed radially and work together as an integrated flow control system, combining multiple simple elements to achieve complex flow distribution and high productivity
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 design improves refueling efficiency by allowing oil to flow uniformly through a larger and more stable gap, extending the service life of the refueling gun and reducing refueling time.
Implementation Method 1
an end portion of the valve rod located in the pump body is connected to a negative pressure generating assembly, the negative pressure generating assembly includes a disk, a plurality of limiting members that are fixed to the same side of the disk and that are distributed circumferentially, and a sealing ring
Implementation Method 2
the sealing ring is capable of reciprocating along the limiting member, a sliding direction of the sealing ring is perpendicular to a surface of the disk, the sealing ring is capable of sealingly abutting against the disk after sliding in the direction toward the disk, and the sealing ring is slidingly connected to an inner wall of the pump body and is sealingly connected to the inner wall of the pump body
Data Source
AI summary
A refueling gun comprises a housing, a valve rod, and a handle. A pump body is provided within the housing, the pump body is connected to an oil intake pipe and an oil outlet pipe, and a first check valve is provided within the oil intake pipe; an end portion of the valve rod located in the pump body is connected to a negative pressure generating assembly comprising a disk, a plurality of limiting members, and a sealing ring; the disk is fixedly connected to the end portion of the valve rod; the sealing ring is sleeved on the periphery of the plurality of limiting members, the sealing ring is slidingly connected to an inner wall of the pump body and is sealingly connected to the inner wall of the pump body; and the handle is rotatably provided on the housing and is connected to the valve rod.