Adjustable Delivery Volume Pump with Hydraulic Backup Valve
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Solution Overview
Problem
Existing engine lubricating oil pumps face challenges in efficiently adjusting delivery volume to match varying engine requirements, such as rotational speed and temperature, due to limitations in valve design and actuation mechanisms, particularly when electromagnetically operable valves are not feasible or fail.
Innovation Solution
A pump design incorporating a fluidically operable valve and an electromagnetic valve, which together adjust the setting pressures in two chambers to control the delivery volume, ensuring flexibility and reliability even if the electromagnetic valve fails, by using a robust hydraulic valve to regulate pressure and prevent damage from excessive output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an electromagnetically operable manifold valve is used to adjust delivery volume, then rapid adjustment capability is improved, but device complexity and reliability concerns increase when electrical actuation fails
Solution Approach 1:
A fluidically operable valve is introduced as an intermediary backup mechanism. This valve uses hydraulic pressure from the pump's own output to actuate the adjusting member, eliminating dependence on electrical actuation while maintaining rapid adjustment capability through fluid pressure transmission.
Solution Approach 2:
The system uses its own hydraulic output pressure to actuate the backup fluidically operable valve, creating a self-sufficient adjustment mechanism that does not require external electrical power or control systems, thereby improving reliability while maintaining speed.
2Reliability
If a hydraulic valve is used as backup when electromagnetic valve fails, then reliability is improved, but device complexity increases
Solution Approach 1:
The fluidically operable backup valve is integrated into the existing pump housing structure, merging the backup function with the primary electromagnetic valve system. This consolidation reduces overall system complexity by eliminating separate backup mechanisms while maintaining reliability.
Solution Approach 2:
The fluidically operable valve serves multiple functions: it acts as a backup when the electromagnetic valve fails, and can potentially serve as the primary actuation mechanism under certain operating conditions. This multi-functionality reduces the need for separate dedicated components, thereby reducing complexity.
3Adaptability or versatility
If delivery volume is adjusted to match varying engine requirements, then adaptability is improved, but control precision and response time become more difficult to maintain
Solution Approach 1:
The system employs pressure feedback from the pump output to actuate the fluidically operable backup valve. This feedback mechanism ensures precise delivery volume control by continuously monitoring and responding to pressure changes, maintaining accuracy despite varying engine requirements.
Solution Approach 2:
The adjusting member modifies the delivery volume by changing geometric parameters such as the eccentricity between the delivery rotor and adjusting member. This parameter-based control enables precise delivery volume adjustment while maintaining smooth operation and accurate control across varying engine conditions.
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 allows for precise and flexible adaptation of delivery volume to meet engine demands, ensuring reliable operation and preventing pump output pressure from exceeding safe limits, even in the absence of electrical actuation, thus maintaining efficient fluid supply.
Implementation Method 1
an electromagnetic valve, also for applying a setting fluid to the adjusting device
Implementation Method 2
a fluidically operable valve for applying a setting fluid to the adjusting device in a controlled way
Data Source
AI summary
A pump which exhibits an adjustable delivery volume, the pump including (a) a pump housing comprising a delivery chamber; (b) a delivery rotor which can be rotated about a rotary axis within the delivery chamber, for delivering the fluid; (c) an adjusting device, including: (c1) an adjusting member which can be adjusted in the pump housing in order to adjust the delivery volume of the pump; (c2) a first setting chamber for generating a first setting pressure for adjusting the adjusting member; (c3) and a second setting chamber for generating a second setting pressure for adjusting the adjusting member; (d) a fluidically operable valve for adjusting the setting pressure of the first setting chamber; (e) and an electromagnetic valve, comprising: a pressure port for a setting fluid which is diverted from the high-pressure side; and a relief port for the setting fluid.