Ventilation Hood Design for Engine Generator Package
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Solution Overview
Problem
The existing package-storage type engine generators experience increased pressure loss due to flow resistance in the ventilation passage from the engine chamber to the radiator chamber, particularly when using a radiator fan for ventilation, and the need for a labyrinth structure to prevent rainwater ingress results in further pressure loss.
Innovation Solution
A package-storage type engine generator design where the ventilation hole is positioned between the reserve coolant tank and the exhaust silencer, displaced from the radiator fan, and covered by a ventilation hood with an outlet opening facing the ventilation hole, allowing smooth airflow while preventing rainwater entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ventilation hole is positioned directly below the radiator chamber with a louver structure, then rainwater can be prevented from entering the engine chamber, but the flow resistance of ventilation air increases and pressure loss increases
Solution Approach 1:
The invention extracts the rainwater prevention function from the ventilation passage structure itself and relocates it to the ventilation hood positioned at the radiator chamber side. This allows the ventilation passage to maintain a simple, low-resistance structure while the hood's overhang and positioning prevent rainwater from reaching the ventilation hole.
Solution Approach 2:
The ventilation hood acts as an intermediary element between the external environment and the ventilation hole. It provides a protective shield that prevents rainwater ingress without interfering with the airflow path, thus resolving the contradiction between protection and flow resistance.
2Reliability
If a labyrinth structure is added to the ventilation passage to prevent rainwater ingress, then rainwater can be kept out, but the pressure loss of ventilation air increases
Solution Approach 1:
The invention removes the rainwater prevention function from the ventilation passage and transfers it to the ventilation hood. This extraction allows the passage to remain simple and low-resistance while the hood provides the necessary protection.
Solution Approach 2:
Instead of adding complexity in the horizontal dimension (labyrinth structure in the passage), the solution uses the vertical dimension by positioning the hood above the ventilation hole and using its overhang to deflect rainwater away, thus preventing ingress without increasing passage resistance.
3Productivity
If the ventilation hole is positioned close to the radiator fan, then ventilation efficiency can be improved, but rainwater can more easily enter the ventilation hole
Solution Approach 1:
The ventilation hood serves as a protective intermediary between the ventilation hole and external rainwater. It allows the hole to be positioned optimally near the fan for efficient ventilation while the hood's physical barrier prevents rainwater from reaching the hole.
Solution Approach 2:
The hood's positioning and overhang create a preliminary protective barrier that deflects rainwater away from the ventilation hole before the water can reach it, thus preventing ingress while allowing the hole to be in an optimal position for airflow.
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 reduces pressure loss in the ventilation passage by minimizing flow resistance and preventing rainwater from entering the ventilation hole, ensuring efficient airflow from the engine chamber to the radiator chamber.
Implementation Method 1
ventilation air from the engine chamber enters the radiator chamber via the ventilation hole
Implementation Method 2
the flow resistance of the ventilation air may increase, which results in increase of the pressure loss of the ventilation air
Implementation Method 3
a radiator fan disposed in the radiator chamber
Implementation Method 4
A ventilation hood covers above and around the ventilation hole
Data Source
AI summary
In the present invention, a package is partitioned into upper and lower sections. An engine and a generator are both disposed in the lower section. In the upper section are disposed: a radiator chamber in which a radiator and a radiator fan are disposed, and an intake chamber in which an intake silencer is disposed. A ventilation hole directly communicates the radiator chamber with an engine chamber in which the engine and the generator are disposed. The ventilation hole is displaced from the radiator fan in a long-side direction of the package. A ventilation hood covers above and around the ventilation hole. An outlet opening of the ventilation hood is formed being displaced in a short-side direction (Y) of the package to face the ventilation hole.