Working Machine Heat Exchanger Layout for Hydraulic and Electric Cooling
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Solution Overview
Problem
The arrangement of multiple heat exchangers in working machines is limited by their size and the need for cooling fans, restricting layout flexibility and increasing occupancy.
Innovation Solution
A working machine with a first cooling system that exchanges heat between hydraulic fluid and a first cooling medium, a second cooling system that exchanges heat between the first and second cooling media, and a third cooling system that exchanges heat between the first cooling medium and outside air, allowing for compact and flexible arrangement of cooling systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple gas-liquid heat exchangers are provided for cooling hydraulic fluid and electric devices, then cooling function is improved, but arrangement flexibility is reduced and occupancy increases
Solution Approach 1:
The patent combines multiple cooling functions into a single integrated cooling system. The cooling system includes a cooling pump, cooling passage, and heat exchanger that can cool both the hydraulic fluid and electric devices through shared cooling media circulation, eliminating the need for separate gas-liquid heat exchangers for each cooling function and thereby improving arrangement flexibility while maintaining reliable cooling performance
Solution Approach 2:
The cooling system is designed with multi-functionality to serve multiple cooling needs simultaneously. The cooling passage and heat exchanger can exchange heat with both hydraulic fluid and electric devices, allowing a single system to perform multiple cooling functions that would traditionally require separate dedicated systems, thus enhancing arrangement flexibility
2Productivity
If gas-liquid heat exchangers are used to cool cooling media, then cooling efficiency is improved, but occupancy and layout constraints increase
Solution Approach 1:
The patent employs hydraulic principles by using liquid cooling media circulating through enclosed passages to transfer heat away from electric devices and hydraulic components. This liquid-based thermal management system replaces bulky gas-liquid heat exchangers with more compact hydraulic circuits, maintaining high cooling efficiency while reducing the volume occupied by the cooling system components
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
Increases the flexibility of heat exchanger arrangement and compacts the cooling systems, optimizing space utilization.
Implementation Method 1
a first heat exchanger to exchange heat between the hydraulic fluid and the first cooling medium to cool the hydraulic fluid
Implementation Method 2
a second heat exchanger to exchange heat between the first cooling medium and the second cooling medium to cool the second cooling medium
Implementation Method 3
a third heat exchanger to exchange heat between the first cooling medium and outside air to cool the first cooling medium
Data Source
Figure 1
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AI summary
A working machine (1) includes a working device (4); a hydraulic system (5) including an actuator (50a, 50b, 50c), and a hydraulic pump (51) to supply a hydraulic fluid (S) to the actuator (50a, 50b, 50c); an electric device (6a, 6b, 6c); a power generator (7) to generate electric power to be directly or indirectly supplied to the electric device (6a, 6b, 6c); a first cooling system (10) to cool the electric device (6a, 6b, 6c) with a first cooling medium (A); and a second cooling system (11) to cool the power generator (7) with a second cooling medium (B). The first cooling system (10) includes a first heat exchanger (100a) to cool the hydraulic fluid (S) through heat exchange with the first cooling medium (A), a second heat exchanger (100b) to cool the second cooling medium (B) through heat exchange with the first cooling medium (A), and a third heat exchanger (100c) to cool the first cooling medium (A) through heat exchange with outside air to a temperature lower than temperatures before the heat exchange of the hydraulic fluid (S) and the second cooling medium (B).