Fuel Overflow Valve Annular Collar Venting Design
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Solution Overview
Problem
Existing fuel injection devices face challenges in adequately venting the low-pressure area, which is essential for lubrication and pressure regulation, due to the design limitations of known fuel overflow valves that hinder effective ventilation.
Innovation Solution
A fuel spill valve with a compact design that includes a valve carrier with a sleeve-shaped section and annular collar, allowing for improved venting by connecting the low-pressure area to a return line through a ring-shaped valve member and valve spring mechanism, ensuring effective pressure relief and ventilation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pressure control valve design is used with the inlet located deep inside the valve body, then the pressure limiting function is achieved, but the venting of the low-pressure area becomes difficult and the valve becomes very long
Solution Approach 1:
The inlet connection is moved from a deep axial position to a position on the annular collar that is accessible from the exterior of the valve body. This dimensional repositioning allows the low-pressure area to be vented effectively while maintaining the pressure limiting function, and significantly reduces the required length of the valve body.
Solution Approach 2:
The inlet connection is extracted from the deep interior of the valve body and repositioned on the externally accessible annular collar. This extraction allows independent optimization of the venting function without compromising the pressure limiting function, resolving the contradiction between reliable pressure control and effective venting.
2Reliability
If the inlet is located very deep in the pressure control valve, then the pressure control function is maintained, but the venting in the inlet becomes difficult
Solution Approach 1:
The inlet connection is repositioned from a deep axial location to a position on the annular collar that is accessible from the exterior. This dimensional change dramatically reduces the required valve length while maintaining the pressure control function through the valve member's interaction with the valve seat on the annular collar.
3Ease of manufacture
If a simple overflow valve design is used, then the manufacturing is easier, but the venting of the low-pressure area is insufficient
Solution Approach 1:
The annular collar serves multiple functions: it provides a mounting surface for the valve member, forms part of the pressure control mechanism with the valve seat, and crucially, provides an externally accessible location for the inlet connection to enable effective venting. This multi-functionality maintains manufacturing simplicity while dramatically improving venting performance.
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 enhances ventilation in the low-pressure area, improving lubrication and pressure regulation within the fuel injection device, leading to a more efficient and compact design.
Implementation Method 1
The valve member is acted upon by a valve spring in the closing direction
Implementation Method 2
the pressure prevailing in the low-pressure region in the opening direction. If the pressure in the low-pressure area exceeds the opening pressure determined by the valve spring, the fuel overflow valve opens
Data Source
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AI summary
The invention relates to a fuel overflow valve for a fuel injection device, in particular for limiting the pressure in a low-pressure region of the fuel injection device. The fuel overflow valve (36) has a valve element (58) which is movably arranged in a receiving portion (40) and which is urged in the closing direction by a valve spring (60) and in the opening direction by the pressure in the low-pressure region (19, 52). A connection (54) of the low-pressure region (19, 52) to a return line (38) is opened by the overflow valve (36) when an overflow valve opening pressure is reached. A valve support (42) is arranged in the receiving portion (40) in a stationary manner, said valve support (42) having a sleeve-shaped portion (44) on which the annular valve element (58) is movably guided. A connection (54) to the return line (38), said connection running through the sleeve-shaped portion (44), is controlled by the valve element (58).