Anti-surge device for a suspended centrifugal fan

CN224859773UActive Publication Date: 2026-10-16KRUPP GRP
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Patent Information

Application Number
CN202522563763.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-12-03
Publication Date
2026-10-16
Estimated Expiration
2035-12-03

AI Technical Summary

Technical Problem

[0003]喘振是指当离心风机或压缩机的流量减小到一定程度时，气流在叶轮和蜗壳内部发生周期性的剧烈波动，表现为流量、压力以及转速的大幅度振荡，这种现象的本质是风机外部用气负荷发生变化，例如管网末端阀门突然关闭或下游设备停止工作，导致风机输出能力与管网需求瞬间失衡，形成了供大于求的状态，从而造成气流在风机内部发生倒流，这种倒流进一步加剧了系统的不稳定，最终导致风机内部零件承受过大的交变载荷，会引发严重的机械损坏，缩短设备使用寿命，甚至造成生产中断，现有技术采用复杂的电气控制系统，通过变频调速或泄放阀门来实现流量的调节，以应对喘振的发生，然而，这些依靠电子元器件、传感器和执行机构的控制方案，存在结构复杂、响应速度受限于控制回路的计算和执行时间、在恶劣工况下可靠性不足，并且调试和维护成本较高的缺点，特别是在需要毫秒级响应的场合，传统控制系统难以快速、准确地打开泄放通道，及时消除气流倒流的隐患

Benefits of technology

[0016] 1. This utility model, by setting like-pair repulsive magnetic plates and magnetic rings on the outside of the air outlet duct, utilizes the dynamic balance between airflow pressure difference and magnetic repulsion to achieve adaptive opening and closing of the air outlet. This solves the problem that existing centrifugal fans are prone to surge when operating conditions change and the anti-surge response is not timely enough. It achieves the effect of automatically and quickly releasing excess airflow without external control, effectively preventing fan surge, and improving the stability and reliability of fan operation.

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Abstract

The utility model relates to fluid machinery technical field discloses a kind of anti-surge devices of suspension type centrifugal fan, including air outlet pipe, air outlet pipe outside is equipped with anti-surge mechanism, repulsion is set in the inside magnetic attraction piece of anti-surge mechanism and magnetic attraction ring, utilize air outlet pipe inside and outside pressure difference control air outlet automatic opening and closing, air outlet pipe outside is also equipped with the limiting mechanism for limiting magnetic attraction piece displacement, discharge vent discharges release airflow in limiting mechanism, observation port is used for monitoring the state of magnetic attraction piece.The utility model realizes automatic pressure relief without external control by magnetic force and pressure difference dynamic balance, solves the surge problem of centrifugal fan, with simple structure, response is quick, operation is reliable, the effect that maintenance is easy, improves the stability and reliability of fan operation.
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