HVAC Blower with Adjustable Cutoff Plate for Variable Static Pressure
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Solution Overview
Problem
Conventional HVAC blower systems face inefficiencies due to fixed outlet sizes and cutoff angles, which compromise performance when operating conditions change, such as varying static pressures.
Innovation Solution
An HVAC system with an adjustable cutoff plate that can be moved between different positions to alter the blower's cutoff angle, allowing the system to optimize airflow based on static pressure measurements and demand, thereby improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fan speed is increased to increase airflow, then airflow rate is improved, but operating efficiency deteriorates
Solution Approach 1:
The patent changes the geometric parameter of the outlet (cutoff angle) rather than only changing operational parameters (fan speed). By adjusting the cutoff angle to match different operating conditions, the system maintains optimal efficiency across varying airflow requirements, avoiding the energy losses associated with operating a fixed-outlet blower at non-optimal speeds.
2Productivity
If fan speed is increased to supply more zones, then airflow rate is improved, but performance deteriorates
Solution Approach 1:
The patent introduces a dynamic outlet configuration that can adapt to different operating conditions. The adjustable cutoff plate allows the outlet geometry to change based on the number of active zones and required airflow, ensuring the blower operates at peak performance across multiple operating scenarios rather than being optimized for a single condition.
3Device complexity
If outlet size is fixed, then device complexity is reduced, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The outlet is segmented into adjustable sections controlled by the cutoff plate, allowing independent optimization of different outlet configurations. This segmentation enables the system to adapt to various operating conditions (single-zone vs. multi-zone operation) while maintaining relatively simple overall structure.
Data Source
AI summary
A blower for an HVAC system, the blower includes a housing with an intake and an outlet, a fan or blower wheel disposed within the housing and configured to draw air into the housing via the intake and to exhaust air from the housing through the outlet, and an adjustable cutoff plate configured to be moved between at least a first position defining a first cutoff angle and a second position defining a second cutoff angle.