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Backward Centrifugal Fans Factory

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Backward Centrifugal Fans Manufacturer

Backward centrifugal fans refer to a type of centrifugal fan where the blades of the impeller are curved backward relative to the direction of rotation.In these fans, when air enters the impeller, it is accelerated and then discharged in a direction that is more towards the tangential direction of the fan casing. Compared to other types of centrifugal fans , backward centrifugal fans typically have higher efficiency, better aerodynamic performance, and can operate more stably under a wider range of air volume and pressure conditions. They are commonly used in various industrial and commercial applications that require efficient air movement, such as ventilation systems, air conditioning systems, and industrial processes where air needs to be moved with relatively high pressure and efficiency.

About
Yuyao Jiale Ventilation Equipment Co., Ltd.
Yuyao Jiale Ventilation Equipment Co., Ltd. is a professional manufacturer and processor of central air conditioning terminal air conditioning products such as centrifugal fans, air purification fans, exhaust fans, dehumidification fans, and ceiling single air intake fans.
The company is China OEM Backward Centrifugal Fans Factory and Wholesale Backward Centrifugal Fans Manufacturer. It has rich experience in the research and development and production of forward centrifugal fans and impellers. It adopts single-phase direct-coupled AC and EC motor drive structures and has provided a variety of high-quality products and professional ventilation solutions for globally renowned enterprises. Centrifugal fans feature high efficiency, low noise, convenient speed regulation and small structural space. They are ideal supporting products for variable air volume air conditioning units, duct air conditioning units, HVACR systems and fresh air systems, air purification equipment, etc. Our integrity, strength and product quality have been highly recognized by the industry. Welcome friends from all walks of life to visit, guide and conduct business negotiations
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Backward Centrifugal Fans Industry knowledge

What are the typical application scenarios for Backward Centrifugal Fans?

1. Typical Application Scenarios

Backward centrifugal fans are widely used in the following fields due to their high efficiency, stable pressure characteristics, and low noise:

2. Air Conditioning and Ventilation Systems

Providing stable air supply and exchange in VAV (Variable Air Volume) air conditioning terminals in large commercial buildings and office buildings.

3. Industrial Dust Collection and Smoke Exhaust

Suitable for forced extraction of dust and smoke, such as in industrial dust collection and smoke exhaust systems, maintaining high air volume under medium pressure conditions.

4. High-Pressure Air Supply and Cooling

Performing excellently in applications requiring high static pressure, such as combustion air, product cooling, and fluidized bed boiler air supply.

5. Kitchens and Clean Environments

Due to their low noise and compact structure, they are often used in kitchen exhaust, cleanroom ventilation, and other places with strict requirements for noise and space.

What are the advantages of Backward Centrifugal Fans compared to forward-curved or axial fans?

Key Indicator Backward Centrifugal Fan Forward‑Curved Centrifugal Fan Axial Fan
Efficiency Highest efficiency, lowest energy consumption Lowest efficiency, highest energy consumption Moderate efficiency; suitable for high‑flow, low‑pressure applications
Noise Low operating noise, better comfort Relatively higher noise Average noise, increases with high flow rates
Load Stability Resistant to overload, wide applicable range Prone to overload, narrow applicable range Sensitive to pressure drop; best for low‑pressure systems
Structure & Maintenance Compact structure, can use high‑speed bearings, lower maintenance cost More complex structure, speed limited Simplest structure but requires strict duct layout

Overall Advantages: Backward-curved centrifugal fans achieve higher static pressure with lower power consumption under the same airflow and total pressure conditions. They also operate smoothly and with low noise, making them suitable for modern buildings and industrial systems with strict requirements for energy consumption and comfort.

How to perform routine maintenance on Backward Centrifugal Fans?

1. Airflow and Static Pressure Variation Requirements: If the system requires airflow adjustment under different operating conditions (such as seasonal loads, equipment start-up and shutdown), it is

recommended to use VFD for continuous speed control.

2. Energy Consumption and Operating Costs: Variable frequency speed control reduces motor power proportionally to the cube of the airflow, significantly saving energy, especially in HVAC systems

operating for extended periods.

Motor Compatibility: The 133mm series provides a 0-10VDC/PWM control interface, directly compatible with VFDs or speed controllers, requiring no additional modifications.

3. Noise and Vibration Control: Lower noise levels at low speeds improve the comfort of the environment, making it suitable for noise-sensitive precision instruments.

4. System Complexity and Cost If it is only used under a single fixed operating condition and the air volume requirement is constant, VFD can be omitted, reducing system cost.

Frequently Asked Questions (FAQ)

Q1: What are the main technical parameters of the Backward Centrifugal Fans from Ningbo Haoyue Fan Manufacturing Co., Ltd.?

A: The Backward Centrifugal Fans offered by the company, such as B2E190-063A-AA00 (impeller diameter 190mm, maximum air volume 540m³/h) and B4D450-208A-AT00 (impeller diameter 450mm, maximum air volume 5600m³/h), have an IP44 protection rating, CE/CCC certification, a power range from 0.7kW to 7.2kW, a noise level of approximately 80dB, and are suitable for environments ranging from -25°C to +60°C.

Q2: What customization options are available for the Backward Centrifugal Fans from Ningbo Haoyue Fan Manufacturing Co., Ltd.? A: Our company can provide customized solutions based on customer needs, including dimensions, materials, motor type (single-phase direct drive AC or EC), speed, control method (variable frequency speed regulation), and packaging method (foam box, wooden box), to meet the space, noise, and energy efficiency requirements of different projects.

Q3: What are the key points for the installation and maintenance of Backward Centrifugal Fans?

A: During installation, ensure that the inlet and outlet are aligned with the fan axis to avoid excessive bending that could lead to pressure loss; maintain a uniform gap between the impeller and the casing to prevent vibration; regularly check bearing lubrication, impeller balance, and the integrity of the protective mesh; cleaning dust can extend service life and maintain low noise.

Q4: How is the energy efficiency of Backward Centrifugal Fans evaluated?

A: Common indicators include air volume (m³/h), static pressure (Pa), power (W), and efficiency (%). Backward-curved fans typically have 10%-20% lower power consumption than forward-curved fans at the same air volume and static pressure, thus offering better energy efficiency. Actual projects can verify this through CFD simulation or on-site testing.