How to choose a suitable Roots blower

1、 Four core steps for selection: scene driven, parameter matching

Choosing a Roots blower must start with specific application scenarios, and match the system with the four core parameters of air volume, pressure, material, and energy efficiency to avoid the misconception of "the greater the power, the better".

|Application scenarios | Recommended wind pressure range | Airflow calculation benchmark | Material requirements | Energy saving/low-noise suggestions|

|Wastewater treatment aeration | 39.2-58.8 kPa | 60-80 m ³/min per 10000 tons of water | Nickel plated or 316L stainless steel rotor, corrosion-resistant | Choose the three bladed drum type (energy-saving 15%) or Baihui screw machine (energy-saving 20-30%)|

|Aquaculture oxygenation | 19.6-58.8 kPa | 0.5-1.5 m ³/min per acre per meter of water depth | Ordinary cast iron is sufficient, moisture-proof sealing is required | Priority is given to Xinqianshun XQSSR80 (75dB) and Sante (74dB) low-noise models|

|Pneumatic conveying (dilute phase) | 49-98 kPa | Based on material density and conveying distance, generally 1-100 t/h | Oil free and clean output, priority given to sealing | Choose a two-stage series model (>98kPa) to avoid single-stage overpressure|

|Vacuum packaging/negative pressure suction | -10 to -49 kPa | Calculated based on suction port area and suction rate | Negative pressure specific model required, leak proof design | Choose Ruizhe negative pressure type, matched with check valve and filter|

Key formula:

Required pressure (kPa) ≈ Water depth (m) × 9.8+Pipeline resistance (5-15kPa)

Required air volume (m ³/min)=total oxygen demand (kgO ₂/h) ÷ oxygen transfer efficiency (0.2-0.35) × 60

2、 Selected local brands and models in Linyi, Shandong (measured data in 2026)

Linyi and its surrounding areas (Jinan, Zhangqiu) are the highland of the national Roots blower industry. Local procurement can enjoy 24-hour response, free installation and commissioning, and direct supply of spare parts services.

Avoiding pitfalls tips:

5.5kW Roots blowers priced below ¥ 2500 are mostly circular fans, not of genuine Roots structure, and cannot be used for aeration or pneumatic conveying;

All rental roof projects must provide a CMA certified roof load-bearing report, otherwise they cannot be connected to the grid - this is a mandatory requirement in Shandong Province and is not related to wind turbine selection but must be synchronized with compliance.

3、 Trends in Energy Saving and Low Noise Technologies (National Standard Implementation in 2026)

Starting from February 1, 2026, the "Energy Efficiency Limit Values and Energy Efficiency Evaluation Values for General Purpose Roots Blowers" (JB/T 15081-2025) will be officially implemented, with energy efficiency level 1 as the recommended procurement standard.

Energy saving path:

Prioritize the use of permanent magnet synchronous variable frequency integrated machines (such as the MBTYC), which can save over 30% of energy compared to the same period last year;

Traditional models are equipped with IE4 high-efficiency motors, which can improve the overall efficiency by 5-8%;

Adopting a three bladed arc-shaped rotor (patented by Zhanggu), the volumetric efficiency is increased by 12%.

Noise reduction scheme:

Basic noise reduction: Install impedance composite muffler (capable of reducing noise by 15-20 dB);

Advanced solution: Choose a three bladed spiral rotor (Rongheng, MD series) to reduce pulsating noise by 40%;

Ultimate solution: Air suspension blower (non Roots) - no mechanical contact, noise ≤ 70dB, but priced three times higher than Roots.

📌 National Energy Efficiency Label: When purchasing, please identify the Energy Efficiency Level 1 label (blue background with white text) to avoid purchasing outdated models with "Energy Efficiency Level 3".

4、 Key practical points for installation and debugging

Installation environment:

Indoor ventilation, temperature ≤ 40 ℃, no rain, no corrosive gases;

The foundation requires concrete pouring and rubber damping pads to avoid resonance and sound transmission.

Pipeline connection:

Imported air filters must be installed (cleaned every 3 days);

The outlet must be equipped with a one-way valve and a safety valve to prevent reverse flow during shutdown;

Use elastic joints to connect pipes and avoid stress transmission to the fan.

First startup debugging:

Run without load for 10 minutes and check for any abnormal noise;

Gradually load to the rated pressure and observe whether the current is stable;

Use a sound level meter to detect noise. If it exceeds 85dB, check if the muffler is installed properly.