Engine Operating Machine Cooling Box Airflow Path Design
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Solution Overview
Problem
Existing engine operating machines face inefficiencies in cooling the operation box due to higher flow path resistance and inadequate air flow, leading to insufficient cooling effects, especially with the configuration of air intake and exhaust ports in previous designs.
Innovation Solution
The engine operating machine incorporates a cooling fan with an upper air intake opening and a bottom air exhaust opening oriented to face the air intake port, featuring an obliquely disposed bottom plate and vertical plates with upper openings, and includes blind holes in the exhaust ports to enhance air flow and prevent water and dust intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If outside air intake ports are merged and air supply paths are combined, then device complexity is reduced, but flow path resistance increases and cooling effect deteriorates
Solution Approach 1:
The air supply path is segmented into multiple independent paths: a first air supply path with a first outside air intake port and first communication port, and a second air supply path with a second outside air intake port and second communication port. This segmentation allows each path to have optimized flow characteristics while maintaining overall system simplicity.
Solution Approach 2:
Different regions of the operation box are provided with different air supply characteristics. The first communication port is positioned to supply air to a first region, while the second communication port supplies air to a second region. This local optimization ensures that each region receives adequate cooling based on its specific thermal load and airflow requirements.
2Device complexity
If outside air intake port is positioned on the side wall adjacent to communication port, then device complexity is reduced, but air flow distribution becomes uneven and cooling effect deteriorates in adjacent spaces
Solution Approach 1:
The air intake ports and communication ports are positioned asymmetrically within the operation box. The first outside air intake port and first communication port are arranged in a first region, while the second outside air intake port and second communication port are arranged in a second region. This asymmetric arrangement optimizes airflow patterns and ensures uniform temperature distribution throughout the operation box.
3Temperature
If cooling air flow rate is increased to improve cooling effect, then temperature control improves, but energy consumption increases
Solution Approach 1:
Outside air is introduced into the operation box before the engine starts or at the beginning of operation. The multiple air supply paths are designed to establish optimal airflow patterns in advance, ensuring that cooling air is efficiently distributed to all regions before thermal loads increase, thereby reducing the energy required for continuous high-rate cooling.
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 increases air flow rates and achieves a high cooling effect through forced convection, effectively cooling all components within the operation box by optimizing the air flow path and preventing contamination.
Implementation Method 1
the inside of the control box is cooled by making outside air taken from the outside air intake port, pass through the communication port, and circulated in the casing of the generator by suction force generated by a ventilation fan
Implementation Method 2
a fan (2a) for cooling the engine (2) and the operating machine (3)
Data Source
AI summary
The present invention provides an air cooling means forcibly cools inside of an operation box of controlling an engine generator by using engine cooling air. An engine generator has a generator driven by an engine and an operation box housing a controller for the generator. The engine is cooled by a fan. The operation box has an upper opening for taking outside air and a lower opening for exhausting air to the outside from the operation box. The lower opening is disposed so as to be oriented to the cooling air flow generated by the fan. A bottom plate of the operation box is disposed obliquely to an air intake port for taking air to the engine by the cooling fan for the engine, and the lower opening is opened in the bottom plate.