Hydraulic Pump Layout for Excavator Pressure Mismatch Loss
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Solution Overview
Problem
Conventional construction machines experience significant energy loss due to the supply of working fluid at excessively high pressures to driving devices operating at lower pressures, leading to inefficient energy utilization when multiple driving devices are simultaneously operated.
Innovation Solution
The implementation of a construction machine with three main pumps (first, second, and third main pumps) that selectively supply working fluid to specific driving devices, utilizing bidirectional pumps and accumulators to regenerate energy and minimize pressure mismatches, thereby optimizing energy distribution and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two main pumps supply working fluid to multiple driving devices, then the system structure is simple, but energy loss increases due to pressure mismatch
Solution Approach 1:
The patent divides the hydraulic system into three independent main pumps (first, second, and third main pumps), each dedicated to supplying working fluid to specific driving devices. This segmentation allows each pump to operate at optimal pressure for its assigned devices, eliminating the energy loss caused by pressure mismatch that occurs when fewer pumps serve multiple devices.
2Device complexity
If one main pump supplies working fluid to multiple driving devices, then the device complexity is reduced, but energy utilization efficiency deteriorates
Solution Approach 1:
The patent assigns specific driving devices to specific main pumps based on their pressure requirements. The first main pump supplies the boom cylinder, the second main pump supplies the arm cylinder and bucket cylinder, and the third main pump supplies the rotation motor. This local quality assignment ensures that each pump operates at the optimal pressure for its designated devices, maximizing energy utilization efficiency.
3Stress or pressure
If main pumps are controlled to discharge working fluid at high pressure, then high pressure driving devices are satisfied, but low pressure driving devices experience energy waste
Solution Approach 1:
Each main pump independently controls its own discharge pressure according to the specific pressure requirements of its assigned driving devices. The first main pump maintains high pressure for the boom cylinder, the second main pump adjusts pressure for the arm and bucket cylinders, and the third main pump provides appropriate pressure for the rotation motor. This self-service approach eliminates the need to overpressurize all devices to satisfy the highest pressure requirement.
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 minimizes energy loss and improves energy utilization efficiency by ensuring that working fluid is supplied at optimal pressures to each driving device, reducing energy wastage and enhancing overall operational efficiency.
Implementation Method 1
a first main pump supplying working fluid to the boom cylinder or recovering working fluid discharged from the boom cylinder
Implementation Method 2
a second main pump supplying working fluid to the rotation motor or recovering working fluid discharged from the rotation motor
Implementation Method 3
a third main pump supplying working fluid to the arm cylinder or the bucket cylinder
Data Source
AI summary
Provided is a construction machine. The construction machine includes a boom cylinder driving a boom, a rotation motor rotating a rotary body, an arm cylinder driving an arm, a bucket cylinder driving a bucket, a first main pump supplying working fluid to the boom cylinder and discharging the working fluid in opposite directions, a second main pump supplying working fluid to the rotation motor and discharging the working fluid in opposite directions, and a third main pump supplying working fluid to the arm cylinder or the bucket cylinder.