Sound Proof Box Base Partitioning for Engine Cooling and Noise Control
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Solution Overview
Problem
Conventional sound proof boxes for engine-driven work machines face challenges in maintaining sound insulation and waterproofness while introducing sufficient cooling air, often requiring complex structures that increase manufacturing costs and compromise maintainability due to the need for ducts and air intake ports on lateral walls, which can lead to noise leakage and rainwater ingress.
Innovation Solution
A sound proof box design that separates the base into upper and lower stages with a partition wall, forming a meandering cooling air introduction flow path that reduces the need for lateral air intake ports and allows rainwater to be removed, while also providing a liquid-tight oil reservoir and inspection ports for easy maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an air intake port is provided on the lateral wall of the sound proof case to introduce cooling air, then cooling air can be introduced into the engine chamber, but noise generated by the engine leaks directly out through the air intake port
Solution Approach 1:
The air intake port is relocated from the lateral wall to the top panel of the sound proof case. This dimensional change in the air intake location allows cooling air to be introduced from above through a downward-oriented flow path, physically separating the air intake function from the lateral walls and preventing direct noise leakage to the side.
Solution Approach 2:
The air intake flow path is segmented into multiple sections: the air intake port on the top panel, the flow path guiding air downward, the partition wall separating the engine chamber, and the communication port. This segmentation creates a multi-stage flow path that prevents direct noise transmission while maintaining cooling function.
2Temperature
If an air intake port is provided on the lateral wall to introduce outside air, then cooling air can be supplied, but rainwater may enter the engine chamber together with the air
Solution Approach 1:
The air intake port is positioned on the top panel rather than the lateral wall, changing the orientation of air intake from horizontal to vertical. This allows the use of gravity and downward airflow to prevent rainwater from entering with the cooling air, as rain falls vertically while the airflow moves downward into the chamber.
Solution Approach 2:
The flow path is designed to guide air downward from the top panel before it reaches the engine chamber. This preliminary downward flow action creates a flow direction that naturally repels rainwater, preventing rainwater ingress before it can occur.
3Reliability
If ducts and complex flow paths are provided to prevent noise leakage and rainwater ingress, then sound insulation and waterproofness are improved, but the structure becomes complex and manufacturing costs increase
Solution Approach 1:
The air intake flow path is merged with the partition wall structure. The partition wall serves dual functions: separating the engine chamber and guiding the cooling air flow. This integration eliminates the need for separate complex ducting systems while maintaining sound insulation and waterproofness.
Solution Approach 2:
The partition wall is designed with multi-functionality: it separates the engine chamber, guides cooling air flow, and provides structural support for the sound proof case. This universal design reduces the number of separate components needed, simplifying the overall structure while maintaining reliability.
4Temperature
If lateral air intake ports are provided, then cooling air can be introduced, but maintenance becomes difficult due to dust accumulation in ducts
Solution Approach 1:
The air intake port is relocated to the top panel, creating a vertically-oriented flow path that is more accessible for maintenance. This dimensional change allows easier access to the air intake area and flow path for cleaning and inspection compared to lateral wall installations with complex ducting.
Solution Approach 2:
The air intake function is extracted from the lateral wall area and relocated to the top panel. This separation simplifies the flow path geometry and makes the air intake system more accessible for maintenance activities such as dust removal and inspection.
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
The design effectively prevents noise leakage and rainwater ingress, reduces manufacturing complexity, and enhances maintainability by allowing easy access and removal of dust and foreign matter, while maintaining sound insulation and waterproofness.
Implementation Method 1
to dispose a radiator of an engine 351 in a manner of facing this communication port and, in the case where the engine 351 is equipped with a supercharger, a heat exchanger 354 such as an intercooler or the like of the supercharger to provide a cooling fan 355 for introducing cooling air into this heat exchanger 354
Implementation Method 2
when a cooling fan 355 is rotated to generate a flow of cooling air which goes from the engine chamber 330a to the air discharging chamber 330b, pressure becomes negative inside the engine chamber 330a, and therefore, outside air is introduced from outside the machine into the engine chamber 330a as cooling air
Data Source
AI summary
A cooling air introduction path is formed in a base of a sound proof case of an engine-driven work machine. The base is divided into upper and lower portions, and a space in the upper portion is divided by a separation wall and arranged below an air discharging chamber. The upper part of one space is covered with a arranging plate, a partition wall is erected on the arranging plate, and a cooling air introduction port is provided between the partition wall and the separation wall to provide an engine chamber and one space are communicated, a hole is provided in the plate below the chamber, and one space and the space in the lower portion are communicated and located below the chamber. A cooling air intake port is provided on lateral walls of the lower portion to communicate the space inside the lower portion with the outside of the machine.