Dual-Pump Hydraulic Circuit With Third-Path Pressure Relief
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Solution Overview
Problem
In hydraulic fluid supply devices with both mechanical and electric oil pumps, pressure imbalances can lead to hydraulic fluid leakage due to the absence of a pressure relief mechanism for the electric oil pump, causing gaps in seals and potential fluid loss.
Innovation Solution
A hydraulic circuit design incorporating a first and second oil path connected to the discharge ports of each pump, a hydraulic control circuit with a first regulator valve downstream of the confluence point, a third oil path with a check valve to restrict flow towards the strainer, and a relief valve to discharge excess pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a check valve is provided in the third oil path to restrict oil flow toward the strainer side, then backflow prevention is improved, but pressure rise in the third oil path occurs when the mechanical oil pump operates
Solution Approach 1:
A relief valve is introduced as an intermediary component in the third oil path. This relief valve acts as a mediator between the pressure buildup caused by the check valve and the system, automatically releasing excess pressure when it exceeds a predetermined threshold, thus preventing seal damage while maintaining backflow prevention functionality
Solution Approach 2:
The system dynamically changes the pressure parameter in the third oil path by using the relief valve to maintain pressure within a safe operating range. When pressure exceeds the predetermined value, the relief valve opens to reduce pressure, ensuring the seal remains intact while still preventing backflow during normal operation
2Device complexity
If the electric oil pump is not provided with a pressure relief mechanism, then device complexity is reduced, but pressure rises inside the circuit connecting the electric oil pump and strainer causing seal leakage
Solution Approach 1:
The relief valve in the third oil path serves multiple functions: it prevents pressure buildup that could damage seals in the electric oil pump circuit, works in conjunction with the check valve to regulate flow, and provides an additional safety mechanism. This multi-functional component protects the electric oil pump seal without adding complex dedicated pressure relief mechanisms to the pump itself
Solution Approach 2:
The relief valve acts as an intermediary protective device in the third oil path that indirectly protects the electric oil pump seal. Instead of modifying the electric oil pump structure, the relief valve mediates pressure control in the connected circuit, preventing pressure-related seal failures while maintaining pump simplicity
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 configuration effectively suppresses pressure rises in the hydraulic circuit, preventing hydraulic fluid leakage and maintaining seal integrity.
Implementation Method 1
a relief valve that is provided in the third oil path and discharges oil in the third oil path to the outside when the pressure in the third oil path exceeds a reference pressure
Implementation Method 2
a check valve that is provided in the third oil path and restricts the movement of oil toward the strainer side
Data Source
AI summary
A hydraulic circuit includes a first oil path, a second oil path, a hydraulic control circuit, a third oil path, a check valve, and a relief valve. The first oil path links to a discharge port of a first oil pump. The second oil path links to a discharge port of a second oil pump. In the hydraulic control circuit, a first regulator valve is disposed downstream of a confluence point of the first oil path and the second oil path. The third oil path connects a suction port of the first oil pump and a strainer. The check valve is provided in the third oil path and restricts a movement of oil toward the strainer side. The relief valve is provided in the third oil path and discharges oil in the third oil path to an outside when a pressure in the third oil path exceeds a reference pressure.