Analysis of the Core Causes of Reduced Airflow in NSRH Roots Blowers in Aquaculture

In aquaculture scenarios, NSRH Roots blowers serve as critical aeration equipment, with their airflow stability directly influencing dissolved oxygen levels and the survival rate of cultured organisms.

 Abnormal decreases in airflow typically stem from the following causes:

1. Mechanical Wear Leading to Enlarged Internal Clearances
Design clearances exist between the impellers, wall panels, and casing of Roots blowers.

 After prolonged operation, friction between the impellers and between the impellers and wall panels causes these clearances to widen. For instance, after three years of use, an NSRH-150 blower at an aquaculture farm saw its impeller clearance increase from 0.15mm to 0.3mm, resulting in a 40% increase in internal leakage and a 35% decrease in effective airflow. Such wear requires repair through impeller replacement or clearance adjustment.

2. Leakage and Blockage in the Piping System
Common issues include loose flanges at pipe connections, cracked welds, or clogged micro-porous aeration tubes.

 At one aquaculture base, loose pipe flanges resulted in an annual leakage rate of 12%, causing a 28% decline in airflow. In another case, clogging of micro-porous tubes by algae increased system resistance by 50%, causing the blower outlet pressure to spike to 85kPa (design value: 60kPa) and triggering overpressure protection shutdown.

3. Failure of the Power Transmission System
Belt slippage or motor malfunctions directly affect rotational speed.

 Experimental data shows that when belt tension is insufficient, effective rotational speed decreases by 15%-20%, leading to a proportional decline in airflow. At one farm, a frequency converter fault caused the motor's actual frequency to fall 20% below the set value, resulting in a 30% reduction in blower speed and airflow.

4. Blockage in the Filtration System
Dust accumulation in the intake filter significantly reduces air intake. In one case, an uncleaned filter increased intake resistance by threefold, causing a 25% drop in airflow. It is recommended to clean the filter every four months or adopt self-cleaning filters to reduce maintenance frequency.

NSRH roots blower product information