Ventilation system
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Solution Overview
Problem
Ventilation systems in salt-affected regions face pressure loss due to salt filters and branching air supply passages, leading to insufficient air supply, and DC motor-driven fans experience break-in current issues when a booster fan operates during device startup.
Innovation Solution
A ventilation system with a DC motor-driven air supply or exhaust fan and a booster fan, where the booster fan is actuated only after the main fan is started, and a damper control unit manages airflow to prevent idle operation and reduce break-in current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a booster fan is placed upstream of the air supply fan to strengthen intake power, then air supply capability is improved, but break-in current increases when the ventilation device starts up
Solution Approach 1:
The control unit activates the air supply fan before activating the booster fan. This preliminary action ensures that the air supply fan is already running when the booster fan starts, preventing the air supply fan from operating at idle speed and thereby reducing break-in current while still achieving enhanced air supply capability
Solution Approach 2:
The system dynamically controls the operation sequence of the air supply fan and booster fan based on startup conditions. The control unit adjusts when each fan activates, creating a dynamic operational pattern that optimizes both air supply performance and motor protection
2Reliability
If a salt filter is installed in the air supply passage to protect against salt damage, then durability is improved, but pressure loss increases leading to insufficient air supply
Solution Approach 1:
The system merges the functionality of the air supply fan and booster fan to overcome the pressure loss caused by the salt filter. Both fans work together in a coordinated manner, with the booster fan providing additional pressure to compensate for the resistance introduced by the salt filter, thereby maintaining both durability and sufficient air supply
3Adaptability or versatility
If air supply passage is branched for multiple ventilation devices, then versatility is improved, but pressure loss increases leading to insufficient air supply
Solution Approach 1:
The system combines the output of the air supply fan with the booster fan to create a unified high-pressure air supply source that can serve multiple branched passages. This merged approach ensures that even with multiple branches, each device receives sufficient air pressure and flow
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
Ensures effective air supply and exhaust while protecting the DC motor-driven fans from break-in current by sequencing fan operations and controlling airflow, enhancing ventilation performance and motor protection.
Implementation Method 1
an air supply fan (26) configured to be driven by a DC motor
Implementation Method 2
a booster fan (1) placed upstream or downstream in supply air of the air supply fan (26), and configured to strengthen outside-air intake power of the air supply fan (26)
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A ventilation system (S) includes: a first ventilation device (10a) and a second ventilation device (10b) each including an air supply fan (26) and an exhaust fan (25); a booster fan (1) placed upstream in supply air of the air supply fan (26) of each of the ventilation devices (10a, 10b); and a controller (100) configured to control actuation of the ventilation devices (10a, 10b) and the booster fan (1). The controller (100) determines whether actuation of the ventilation device (10a, 10b) is requested or not, and outputs an actuation signal to the air supply fan (26) to the ventilation device (10a, 10b) whose actuation has been requested such that the booster fan (1) is actuated after the air supply fan (26) has been actuated.