Cab Heating Intake Layout Using Hydraulic Oil Tank Pre-Warmed Air
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Solution Overview
Problem
Existing heating devices in construction machinery, such as hydraulic excavators, experience reduced heating efficiency due to the time required to warm air and decreased air temperature when operating in cold conditions.
Innovation Solution
The heating device is configured to draw pre-warmed air from a hydraulic oil tank, which has been heated by the hydraulic oil's increased temperature from friction and other processes, rather than external air, to improve heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heating device draws in external air from outside, then the heating device can supply air to the operating room, but when the outside air temperature is low, it takes time to warm the air and the temperature of the warm air supplied decreases
Solution Approach 1:
The patent applies preliminary action by positioning the air intake of the heating device at the hydraulic oil tank, which is located downstream of the heat exchanger. This allows the air to be pre-warmed by the heat exchanger before entering the heating device, so that when cold external air is supplied, it has already undergone preliminary heating, reducing the time and energy required to reach the desired temperature in the operating room.
2Productivity
If the heating device draws in external air, then the heating device can operate, but the heating efficiency decreases when outside air temperature is low
Solution Approach 1:
The patent uses the hydraulic oil tank and heat exchanger as an intermediary between the external air intake and the heating device. The air passes through the hydraulic oil tank area where it is warmed by the heat exchanger that cools the prime mover's cooling water and hydraulic oil. This intermediary heating process improves heating efficiency by pre-warming the air before it enters the main heating device, especially when outside air temperature is low.
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 prevents a decrease in heating efficiency by ensuring warmer air is supplied to the operating room, reducing the time needed to reach desired temperatures and potentially lowering power consumption and allowing for a smaller heater design.
Implementation Method 1
the hydraulic oil tank (8) to store hydraulic oil supplied to the actuator (4E to 4H)... the intake section (20) of the heating device (15) is mounted on the hydraulic oil tank (8)... it is possible to draw pre-warmed air into the heating device (15)
Implementation Method 2
a heating device (15) that warms the air drawn in from the intake section (20) and supplies it to the operating room (12A)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The suction chamber (20), which serves as the suction part of the heating device (15), is mounted above the hydraulic oil tank (8). In this case, the hydraulic oil tank (8) has increased in temperature due to frictional heat, decompression, stirring resistance, etc., from the hydraulic pump, various actuators, control valves, etc., so the air that has flowed into the suction chamber (20) is pre-warmed by the hydraulic oil tank (8).