Engine Oil Injection Nozzle with Cylindrical Valve and External Channels
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Solution Overview
Problem
Traditional injection nozzles for lubricating oil in large engines face issues such as blockage due to large particles, uneven pressure distribution, and complexity in design, which affects the free movement of the valve body and the ability to couple nozzles in series.
Innovation Solution
The design features a cylindrical valve body with a turned recess and a pressure chamber of larger diameter, eliminating the need for a valve seat and allowing pressurized oil to directly inject through nozzle outlets, ensuring a simple and robust structure with uniform pressure distribution and easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a valve body with inner borings for conducting oil is used to reduce dead volume, then injection precision is improved, but device complexity increases
Solution Approach 1:
The patent removes the complex internal borings from the valve body and extracts the oil conduction function to a separate external piping system. The valve body becomes a simple cylindrical rod without internal passages, while oil is supplied through external channels that connect to the nozzle outlet, thereby reducing dead volume without complicating the valve body structure.
Solution Approach 2:
The patent separates the valve body from the oil conduction pathways. The valve body handles only the sealing and opening/closing function, while oil supply is handled by separate external channels and a turned recess in the valve body that connects to the nozzle outlet, dividing functions to reduce complexity.
2Manufacturing precision
If a valve body moves backwardly against the oil flow, then closing capability is improved, but reliability deteriorates due to risk of leakage under high pressure
Solution Approach 1:
The patent inverts the conventional valve body movement direction. Instead of moving backwardly against the oil flow, the valve body moves forwardly with the oil flow direction. This inversion allows the valve to maintain reliable sealing under high pressure while improving closing capability, as the oil pressure assists rather than opposes the sealing action.
Solution Approach 2:
The patent changes the operational parameters of the valve body movement from backward against flow to forward with flow. This parameter change fundamentally alters the pressure distribution and sealing mechanics, enabling the valve to withstand high injection pressures without leakage while maintaining precise closing capability.
3Manufacturing precision
If a complex design with valve seat and internal ducts is used, then injection precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent extracts the internal ducts and valve seat complexity from the valve body design. The valve body is simplified to a cylindrical rod without internal passages or seats, while oil conduction is handled by external channels and a turned recess, making the valve body much easier to manufacture while maintaining injection precision through the simplified geometry.
Solution Approach 2:
The patent inverts the conventional approach by eliminating the traditional valve seat and internal ducts from the valve body. Instead of complex internal features, the design uses a turned recess and external oil supply channels, inverting the complexity from internal to external where it is easier to manufacture and maintain.
4Reliability
If a valve body with tight tolerances is used to prevent blockage, then reliability is improved, but ease of operation deteriorates due to restricted valve body movement
Solution Approach 1:
The patent extracts the oil conduction function from the valve body's internal structure and places it in external channels and a turned recess. This removes the need for tight tolerances within the valve body, allowing the valve body to move freely with larger clearances while maintaining reliability through the external oil supply system that prevents particle accumulation.
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 prevents blockage, ensures uniform atomization, and allows for the coupling of nozzles in series, providing consistent and efficient lubrication with minimal risk of valve body jamming and reduced maintenance needs.
Implementation Method 1
a spring disposed around the valve body for establishing a spring-loaded closing of the valve
Implementation Method 2
the pressure chamber in which the pressurised oil can exert a force on the valve body so that it is displaced against the action of the spring for opening the valve
Implementation Method 3
a displaceable valve body having a cylindrical sealing surface which interacts with the cylindrical valve seat boring of the nozzle rod
Data Source
AI summary
An injection nozzle for use in injecting lubricating oil into cylinders in large engines is provided. The nozzle is adapted for fastening in a cylinder wall with a nozzle rod extending through the cylinder wall and with a nozzle outlet at the inner end of the nozzle rod. The nozzle rod includes a cylindrical valve seat boring with a displaceable valve body having a cylindrical sealing face which interacts with the cylindrical valve seat boring of the nozzle rod, the valve body biased by a spring for effective closing of the valve. The valve body is formed by a cylindrical rod having a turned recess in the cylindrical sealing face of the valve body. The turned recess is arranged at the inner end of the valve body with parts of the cylindrical sealing face of the valve body at each side of the turned recess.