In the harsh working conditions of thermal power plants, the cooling fan of the YB3-225M-4 motor is like a special forces soldier, overcoming three major survival challenges with its unique design. This article will reveal its core technology for dealing with vibration, dust, and moisture, as well as practical strategies to ensure long-term operation of the equipment.

1. Vibration tolerance: the art of dynamic balancing

When the motor runs at 1450 r/min, the cooling fan is subjected to an effective vibration velocity impact of 2.8 mm/s. The core of this tolerance lies in the double-layer dynamic balancing system: the rotor is subjected to a dynamic balancing check at the level of 0.5g\cdotpmm/kg, which is equivalent to a deviation of only 0.017g on a 300mm diameter disc. The bearing system uses a combination of deep groove ball bearings and wave spring preload devices to control axial movement to a microscopic scale of 0.15 mm.

The innovative design of the anti-static plastic fan breaks the limitations of traditional metal blades. Using PPO+30% glass fiber composite material, the moment of inertia is reduced to 0.012 kg\cdotpm, which reduces the inertial impact by 60% compared to metal materials. The actual operating data of a coastal power plant shows that after the coal transportation system has been working continuously for 8,000 hours, the vibration value still maintains 92% of the initial performance.

2. Dust protection: five-layer filtration system

Faced with a dust concentration of 15 mg/m3, the cooling fan achieves efficient filtration through a structured protection system. The first digit “5″ of the IP55 protection level represents its dust-proof ability – in the dust test chamber, under extreme conditions of 2 kg of talcum powder injected into 1 cubic meter of space, the inside of the equipment remains clean. The realization of this protection performance relies on:

Gradient filtration structure: from the outer 0.8mm steel plate wind hood to the inner double-lip shaft seal, a step-by-step protection from millimeter level to micron level is formed

Self-cleaning design: Under the action of centrifugal force, the 15° inclined blades make the attached dust detach from the surface at a speed of 3 m/s

Vacuum impregnation process: A 50 μm epoxy resin layer is formed on the surface of the stator winding to prevent dust penetration

In a comparative test of a coal-fired power plant in Shanxi, after the cooling fan using this design ran for 2000 hours, the bearing grease contamination level only increased by 1 NAS level, which is 3 times the cleanliness compared to the traditional design.

3. Moisture resistance: molecular-level sealing technology

When the ambient humidity reaches 95%, the insulation resistance of the cooling fan can still be maintained above 1000 MΩ. This moisture-proof ability is achieved by a triple protection mechanism: the aluminum alloy end cover is anodized for 1000 hours of salt spray test, forming a 10 μm dense aluminum oxide layer on the surface; the stator winding adopts the VPI vacuum pressure impregnation process, and the resin penetration depth reaches 0.3 mm; the hydrophobic coating and automatic drainage holes designed at the bottom increase the condensate discharge rate to 5 mL/min.

In the actual measurement of the plum rain season at a power plant in the Yangtze River Basin, the equipment was operated in a continuous 72-hour heavy rain environment, and the internal humidity was always controlled below 65%. Its sealing performance even passed the accelerated aging test of 50℃/95%RH, and the insulation resistance attenuation rate was ≤5% after 2000 hours of testing.

When looking for high-quality, reliable motors and motor parts, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:

E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

Yoyik offers various types of spare parts for steam turbines, generators, boilers in power plants:
Stop valve J61Y-P55.5190V SA-182 F91
SOLENOID VALVE SR551-DN25DW
Quick closing valve Q661Y-64
Electric stop valve S961Y-2100SPL
Ball valve Q11H-16P
Stop valve J61Y-64I
VALVE S15F0FA4VBLN
valve seal kit MG.00.11.19.01
Spring safety valve A68Y-200
Stop valve J61Y-P56190V 12Cr1MoV
gate Z41H-63I
Stop valve J61H-320
accumulator bladder NXQ-AB-180/10-FY
solenoid valve R900021396 E371
BFP low pressure accumulator skin NXQA-25/31.5-L-EH
Stop valve J61Y-P5250I
ac compressor vacuum pump P-1761
Stop valve J11F-16C
BEARING YW65-50-125A
Electric gate valve Z941H-40
Bearing assembly P8011D-00
Electric stop valve J961Y-200
DOME VALVE INLET ESP & APH DN200 O-RING M5206
needle valve WJ25-F1.6P
COIL SOLENOID WITH DIN CONNECTOR 5811220100
Stop valve J61Y-P54.5150P
Reheat hot section plugging valve SD61H-P5550V SA-182 F91
Stop valve J61Y-P55195I
Fluid coupling YOX II500