Centrifugal fan quality appraisal

Centrifugal fan is a mechanical device that uses centrifugal force to generate airflow and is used in ventilation, ventilation, air conditioning, industrial production and other fields. Generally speaking, a centrifugal fan sucks in and accelerates air through a high-speed rotating impeller to form an air flow, and then discharges it. Centrifugal fans are divided into three types: forward curved plate centrifugal fans, backward curved plate centrifugal fans and radial centrifugal fans.
centrifugal fan can be used in ventilation and air conditioning systems of large buildings and equipment rooms to ensure freshness and convection of indoor air. Centrifugal fans can also be used in highway tunnel ventilation, coal mine ventilation, ocean development, weather forecasting, medical equipment, wind power generation and other fields.
In the case of centrifugal fan quality appraisal, Zhongke Testing can provide centrifugal fan quality appraisal services.

1. Categories of raw materials: Resin and glass fiber are the main raw materials for making fiberglass fans, and resins are divided into unsaturated resins, vinyl resins and epoxy resins. Therefore, during the production process, selecting suitable resin and glass fiber is also the key to affecting the quality of the fan.
2. The quality of components: motors, bearings, belts, pulleys, etc. are all important components of centrifugal fans. Therefore, component quality is also an important factor in determining the quality of the fan. Among them, the motor can be selected according to customer needs.
3, the quality of the craftsmanship: Because the casing and impeller of the fiberglass fan are made using hand lay-up technology. Therefore, production personnel need to follow the standard hand lay-up process, otherwise, it will directly affect the quality of the fan casing and impeller.
4. Impeller precision: The impeller is closely related to the operation of the fan. If the impeller precision is not enough, it will directly affect the performance and operating conditions of the fan.
5, fan auxiliary accessories: It is recommended to install an appropriate amount of shock absorbers at the bottom of the fan to slow down the vibration generated by the fiberglass centrifugal fan during operation. Or a sound insulation device can be installed around the fan, which can not only increase the service life of the fan but also achieve a certain noise reduction effect.

GB/T 21972.3-2023 Technical conditions of variable frequency speed-regulated three-phase asynchronous motors for hoisting and metallurgy Part 3: YZP series variable frequency speed-regulated three-phase asynchronous motors for hoisting and metallurgy (centrifugal fan cooling) (frame size 100~400)
GB/T 21972.3-2013 Technical conditions of variable frequency speed-regulated three-phase asynchronous motors for hoisting and metallurgy Part 3: YZP series variable frequency speed-regulated three-phase asynchronous motors for hoisting and metallurgy (centrifugal fan cooling)
GB 28381-2012 Centrifugal blower energy efficiency limit value and energy saving evaluation value
GB/T 11865-2008 Marine centrifugal fan
GB/T 11799-2008 Marine explosion-proof centrifugal fan
JB/T 11628-2013 YZP series frequency conversion speed three-phase asynchronous motor for lifting and metallurgy (centrifugal fan cooling) technical conditions

An air-cooling equipment company believed that the centrifugal fans it purchased had serious oil leakage and other quality problems, so it had a dispute with the equipment manufacturer.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" with the centrifugal fans involved in the case.
identification and analysis results: The
identification and analysis expert group discussed and conducted comprehensive quality and technical analysis on the relevant information and on-site investigation of the centrifugal fans involved in the case, and made the following suggestions and conclusions:
The hydraulic couplings of centrifugal fans 1﹟~4﹟, 7﹟ and 8﹟ involved in the case operate smoothly, and the noise at each part is stable and without abnormality.
5﹟ and 6﹟ are being replaced by their hydraulic couplings by the manufacturer. The replacement is not because the original hydraulic coupling is damaged, but the ordered hydraulic coupling spare parts need to be run and inspected, and the replaced hydraulic coupling can be used as spare parts for the other centrifugal fans involved in the case.
In summary, there is no quality problem with the centrifugal fan involved.