Electric Excavator Thermal Layout for Cooling and Heater Separation
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Solution Overview
Problem
In compact electric hydraulic excavators, the cooling efficiency of the first heat exchange liquid is reduced due to the proximity of the cooling fan and second reserve tank, which affects the heating efficiency of the second heat exchange liquid.
Innovation Solution
A partition wall is provided between the cooling fan and the electrical heater, with the first reserve tank located on the same side as the cooling fan and the second reserve tank on the same side as the electrical heater, preventing cooling air from hitting the second reserve tank.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cooling fan and second reserve tank are arranged close to each other in compact electric hydraulic excavators, then the installation space is optimized, but the heating efficiency of the second heat exchange liquid is reduced
Solution Approach 1:
The interior of the housing is divided into a first space and a second space by a partition wall. The first space accommodates the cooling fan and first reserve tank, while the second space accommodates the electrical heater and second reserve tank. This spatial segmentation prevents cooling air from reaching the second reserve tank, thereby maintaining heating efficiency while achieving compact arrangement.
Solution Approach 2:
Different regions of the housing are assigned different functional qualities: the first space is designed for cooling functions (housing the cooling fan and first reserve tank), while the second space is designed for heating functions (housing the electrical heater and second reserve tank). This local differentiation ensures that cooling and heating systems operate independently without interfering with each other's efficiency.
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 enhances the heating efficiency of the second heat exchange liquid while maintaining the cooling efficiency of the first heat exchange liquid, improving overall performance without reducing heating efficiency.
Implementation Method 1
a radiator that cools a first heat exchange liquid warmed by cooling the electric motor
Implementation Method 2
a radiator that cools a first heat exchange liquid warmed by cooling the electric motor
Implementation Method 3
a cooling fan that applies cooling air to the radiator
Implementation Method 4
an electrical heater for heating a second heat exchange liquid to be supplied to the heater core
Implementation Method 5
a heater core for heating
Implementation Method 6
a heater core for heating
Data Source
AI summary
An electric hydraulic excavator (1) is provided with a heater core (34) for heating, an electrical heater (35) for heating a second heat exchange liquid to be supplied to the heater core (34), and a second reserve tank (39) into which the second heat exchange liquid flows and from which the second heat exchange liquid flows out. On top of this, a partition wall (12) is provided to partition between a first cooling fan (28) and the electrical heater (35), and a first reserve tank (29) is located on the same side as the first cooling fan (28) on a basis of the partition wall (12) as a boundary, and a first heat exchange liquid for cooling an electric motor (15) and the like flows into and flows out from the first reserve tank (29) with a change in temperature. On the other hand, the second reserve tank (39) is located at the opposite side to the first cooling fan (28) on a basis of the partition wall (12) as a boundary.