Overflow Valve Without External Fixing for High Pressure Pump
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Solution Overview
Problem
In high-pressure injection systems for internal combustion engines, existing overflow valves experience vibrations and noise due to air accumulation in the spring chamber when the system is restarted, leading to mechanical wear, as the damping effect of fuel is lost during shutdown.
Innovation Solution
The design of an overflow valve without external fixing devices, featuring a valve housing with an annular projection and a sealing ring, allowing axial support within the high-pressure pump housing, and an intermediate space for easy air removal, ensures fuel flow and refilling of the spring chamber upon restart, preventing vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overflow valve is equipped with external fixing devices (thread or bayonet connection), then the valve can be securely attached to the housing, but the structure becomes more complex and air removal becomes difficult
Solution Approach 1:
The invention removes external fixing devices (thread or bayonet connection) from the valve housing, extracting the complexity of attachment mechanisms. The valve is instead retained through the interaction between the annular projection on the valve housing and the recess in the pump housing, combined with the sealing ring, achieving secure attachment without complex external fixing structures.
Solution Approach 2:
The valve housing is segmented into functional components: the annular projection for axial support and retention, the sealing ring for sealing, and the valve body for flow control. This segmentation allows each component to perform its specific function efficiently while simplifying the overall structure compared to integrated external fixing devices.
2Reliability
If the spring chamber is sealed tightly during operation, then damping is maintained, but air cannot be removed when the system shuts down
Solution Approach 1:
The system transitions from a static sealed state to a dynamic state where the sealing ring can move axially relative to the pump housing. During operation, the sealing ring maintains tight sealing for damping. During shutdown, the sealing ring can shift position to allow air escape, and fuel can refill the spring chamber through the same path, achieving both sealing and venting functions.
Solution Approach 2:
The annular projection and recess geometry are designed in advance to create an air evacuation path that activates automatically when pressure differential changes during shutdown. The structure preliminarily positions the sealing ring and flow paths to enable air removal and fuel refilling without requiring additional active components or manual intervention.
3Reliability
If fuel flows through the intermediate space during operation, then air is removed and spring chamber is refilled, but the valve structure becomes more complex
Solution Approach 1:
The intermediate space between the valve housing and pump housing serves multiple functions: it acts as a seal between the valve and housing, provides an air evacuation path during shutdown, and serves as a fuel refilling path for the spring chamber. The annular projection and recess structure simultaneously provides mechanical retention and defines the flow path, reducing the need for separate dedicated components for each function.
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 solution prevents vibrations and noise by ensuring the spring chamber is refilled with fuel quickly upon system restart, maintaining damping and reducing mechanical wear, thus enhancing the reliability and efficiency of the high-pressure pump.
Implementation Method 1
a sealing ring (63), in particular a lip seal, which divides the recess (61) into a first partial recess and a second partial recess in a fluid-tight manner
Implementation Method 2
the fluid can flow around the valve on the outside when it is arranged in the recess of the housing
Implementation Method 3
an elastic valve element connected to the closing piston, in particular a valve spring, with which a compressive force can be applied to the closing piston
Implementation Method 4
The pressure of the fluid at the inlet opening and also a spring act on the closing piston. The forces which are under pressure from the spring and the fluid and which act on the closing piston are directed in opposite directions
Implementation Method 5
ensuring the spring chamber is refilled with fuel quickly upon system restart, maintaining damping
Implementation Method 6
maintaining damping and reducing mechanical wear
Data Source
AI summary
A valve (42), in particular an overflow valve (41), for arrangement in a recess in a housing of a high pressure pump, said valve comprising a valve housing (45) that has a valve cylinder (44), a closing piston (46) movable within said valve cylinder (44) between a closed position and an open position such that in the closed position the valve (42) is closed and in the open position the valve (42) is open, an inlet opening (47) for supplying a fluid into the interior of a cylinder chamber (56) enclosed by the valve cylinder (44), at least one outlet opening (49) for discharging the fluid introduced into the cylinder chamber (56), an elastic valve element (51), in particular a valve spring (52), which is connected to the closing piston (46) and by means of which a compressive force can be applied to the closing piston (46), said compressive force being counter to a compressive force that can be applied to the closing piston (46) by the fluid within the cylinder chamber (56) such that the closing piston (46) can be moved, by means of the compressive force applied to the closing piston (46) by the elastic valve element (51) and the fluid, between the closed position and the open position, wherein said valve housing (45) does not have, on the outside, any fastening system, in particular not a thread or bayonet connection, for axial securing in the recess in the housing of the high pressure pump.