Internal drive system for air-cooled heat exchangers
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Solution Overview
Problem
The external drive assembly in air-cooled heat exchangers occupies limited space, complicates inspection and repair, and increases installation costs due to the need for precise positioning after the heat exchanger is installed.
Innovation Solution
An internal drive assembly is positioned inside the plenum of the air-cooled heat exchanger, using a fan shaft, intermediate drive shaft, and drive belt to transfer torque from the engine to the fan, reducing the need for external components and allowing easier access for maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an external drive assembly is used to transfer torque from the engine to the fan, then the drive assembly can be installed outside the plenum, but it occupies limited space and complicates inspection and repair
Solution Approach 1:
The drive assembly is extracted from the external configuration and moved inside the plenum space. The fan shaft extends through the cooling tube assembly to connect the engine to the fan, eliminating the need for external intermediate shafts, sheaves, and bearings. This repositioning improves accessibility for inspection and repair while reducing spatial constraints.
2Ease of manufacture
If an external drive assembly with intermediate shafts and sheaves is used, then torque can be transferred from the engine to the fan, but it increases installation cost and complexity due to precise positioning requirements
Solution Approach 1:
The complex external drive assembly with multiple intermediate components is extracted and replaced with a simplified internal configuration. The fan shaft directly connects the engine to the fan through the cooling tube assembly, eliminating intermediate shafts, sheaves, and bearings that require precise positioning and increase installation complexity.
Solution Approach 2:
Instead of extending the fan shaft externally to connect to the engine, the configuration is inverted by extending the fan shaft through the cooling tube assembly from the inside. This reversal simplifies the drive path and reduces the number of external components needed.
3Volume of moving object
If a fan shaft extends through the cooling tube assembly to an external drive assembly, then torque transfer is achieved, but it occupies limited space between the heat exchanger and engine
Solution Approach 1:
The drive assembly components are nested within the existing plenum space. The fan shaft passes through the cooling tube assembly, and the drive belt is routed within the plenum, utilizing the existing internal volume rather than requiring external space. This nesting approach maximizes space utilization while maintaining maintenance accessibility.
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 internal drive assembly reduces space constraints, simplifies installation, and facilitates easier inspection and maintenance by eliminating the need for external safety covers and intermediate components, while maintaining efficient torque transfer.
Implementation Method 1
a drive belt. The drive belt connects the fan shaft sheave, idler pulley and intermediate drive shaft sheave
Implementation Method 2
The internal drive assembly includes a fan shaft that has a first end and a second end, where the first end of the fan shaft is connected to the fan and the second end of the fan shaft is connected to a fan shaft sheave
Data Source
AI summary
An air-cooled heat exchanger includes a plenum having an intake and a discharge, a cooling tube assembly inside the plenum, a fan assembly that has a fan, an engine positioned outside the plenum, and an internal drive assembly. The internal drive assembly is configured to transfer torque from the engine to the fan. The internal drive assembly is contained inside the plenum.