Control Panel Fan Unit Airflow Path Design
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Solution Overview
Problem
Existing electrical devices in control panels, when fixed to support rails, experience inadequate cooling due to limited airflow from slit holes, leading to increased temperatures, especially when devices are stacked vertically, which restricts natural convection and requires derating to manage heat.
Innovation Solution
An electrical apparatus with a fan unit and a recessed case design that forms an airflow path between the device and the support rail, using openings on the bottom and side surfaces to enhance airflow and a closing mechanism to contain the airflow path, ensuring effective cooling by generating a flow of air through the fan unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If natural convection cooling is used through slit holes in the case, then the structure is simple, but the airflow rate is insufficient and cooling effect is poor
Solution Approach 1:
The patent transitions from static natural convection to dynamic forced convection by introducing a fan unit that actively generates airflow. The fan unit includes a fan blade that rotates to create a flow path, dynamically controlling the air movement through the electrical device to enhance cooling effectiveness.
Solution Approach 2:
The patent introduces an intermediary airflow path formed by the flow path forming member, which guides and structures the air movement between the slit holes. This intermediary structure organizes the chaotic natural convection into a directed flow, improving heat dissipation efficiency.
2Volume of stationary object
If electrical devices are arranged vertically on the support rail to save space, then the space utilization is improved, but the natural convection airflow is restricted and cooling effectiveness deteriorates
Solution Approach 1:
The fan unit creates dynamic airflow that is not dependent on vertical orientation or gravity-driven natural convection. The forced convection system can effectively cool devices regardless of their vertical arrangement, maintaining cooling performance in space-constrained configurations.
Solution Approach 2:
The patent shifts the cooling mechanism from relying on vertical dimension (natural convection requiring height for hot air rise) to utilizing horizontal airflow generation through the fan unit. This dimensional shift allows effective cooling even when devices are tightly stacked vertically.
3Temperature
If derating is applied to reduce current output, then the temperature rise is suppressed, but the productivity and output capability are reduced
Solution Approach 1:
The patent changes the thermal management parameters by introducing active cooling, which alters the operating temperature characteristics of the electrical device. This enables the device to operate at higher current outputs without exceeding temperature limits, effectively changing the performance envelope.
Solution Approach 2:
The fan unit provides continuous cooling action that maintains stable operating temperatures during sustained high-current operation. This continuous thermal management allows the electrical device to maintain full output capability without thermal shutdown or derating.
4Ease of operation
If slit holes are formed on the side face for vertical arrangement, then the device can be mounted vertically, but the airflow path is insufficient and cooling effect is poor
Solution Approach 1:
The cooling system is segmented into multiple components: slit holes for air intake, flow path forming member for flow organization, and fan unit for airflow generation. This segmentation allows each component to be optimized for its specific function while working together to provide effective cooling for vertically mounted devices.
Solution Approach 2:
The flow path forming member acts as an intermediary that connects the slit holes to the fan unit, creating a structured flow path that efficiently guides air through the electrical device. This intermediary structure ensures that the limited slit hole openings are effectively utilized for 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 effectively cools electrical components by creating a controlled airflow path, suppressing temperature rises and allowing for higher current inputs/outputs without derating, thus improving the thermal management of electrical devices in control panels.
Implementation Method 1
a fan unit including a fan that causes a flow of air
Implementation Method 2
an electrical device that generates heat when driven
Data Source
AI summary
An electrical apparatus includes an electrical device that generates heat and a fan unit. A case of the electrical device includes a first opening and a second opening. A case of the fan unit includes a third opening and a fourth opening. The case of the electrical device and the case of the fan unit are configured such that a space sandwiched between a recess of the case of the electrical device and the support rail and a space sandwiched between a recess of the case of the fan unit and the support rail constitute an air flow path.