Small AC oil pump coupling 70Y-34*2 is a key transmission component used to connect the drive motor and the oil pump in the oil system of the power plant. Its core function is to transmit power and compensate for the slight deviation between the shaft system, thereby ensuring the stable operation of the oil pump. This coupling is widely used in steam turbine lubrication systems, fire-resistant fuel systems and auxiliary oil circuits. It is an important component to ensure the stability of the unit oil pressure and equipment safety.

Technical characteristics and design advantages

1. Structural design

The 70Y-34*2 coupling adopts a design that combines elastic elements with rigid structures. The main body is usually made of high-strength alloy steel or forged steel, and has high fatigue strength and impact resistance. Its elastic element can be made of metal diaphragm or non-metallic material (such as polyurethane), which absorbs the vibration of the shaft system through elastic deformation and reduces noise and wear during operation.

2. Performance parameters

This coupling is suitable for AC oil pump systems with a speed range of 1500-3000 r/min. The maximum torque transmission capacity can reach 340 N·m, the axial compensation is ≤1.5 mm, and the radial deviation allowable range is ≤0.2 mm. It can meet the transmission accuracy and reliability requirements of the oil pump system of the power plant.

3. Environmental adaptability

For the high temperature, dusty and oily environment of the power plant, the surface of the coupling is treated with anti-corrosion coating or plating, and the internal sealing structure can effectively prevent oil from penetrating to ensure long-term operation stability. Some models also support online lubrication maintenance to further extend the service life.

Application scenarios in power plants

1. Turbine lubrication system

In the main oil pump or auxiliary oil pump of the steam turbine, the coupling 70Y-34*2 is responsible for connecting the motor and the oil pump to ensure that the lubricating oil is continuously delivered to key parts such as bearings and gearboxes to prevent equipment damage caused by friction overheating. Its high-precision transmission characteristics can avoid the impact of oil pressure fluctuations on the safety of the unit.

2. Fire-resistant oil system

In the EH (electro-hydraulic control) system, the coupling is used to drive the fire-resistant oil pump to ensure a stable supply of high-pressure oil. Its elastic element can effectively isolate the impact of oil pump vibration on the motor and reduce the risk of system resonance.

3. Emergency oil circuit switching

When the main oil pump fails, the AC standby oil pump connected to the coupling can be quickly started, and the system oil pressure is maintained through the instantaneous torque transmission capability of the coupling, which buys critical time for the unit shutdown protection.

Installation and operation and maintenance points

1. Installation specifications

Before installation, check the matching tolerance of the coupling shaft hole and the motor and oil pump shaft (usually H7/k6) to ensure that there are no burrs or scratches. During the centering adjustment, the axial deviation must be controlled within 0.1 mm, the radial deviation must not exceed 0.05 mm, and the laser centering instrument must be used for calibration.

2. Regular inspection

During operation, the coupling temperature rise (normal working condition ≤65℃) and vibration value (≤4.5 mm/s) must be monitored. The elastic elements should be disassembled and checked for aging and cracks every six months, and the metal parts should be subjected to magnetic particle inspection to eliminate hidden defects.

3. Maintenance strategy

It is recommended to replace the elastic elements every 2 years or after 15,000 cumulative hours of operation; the keyway and bolt connection parts should be regularly coated with anti-rust grease to prevent loosening due to corrosion. For high-speed and heavy-load conditions, vibration sensors can be added to monitor the operating status in real time.

In summary, the small AC oil pump coupling 70Y-34*2 has become an indispensable component of the oil system of power plants due to its precise transmission and high reliability. Scientific selection, installation and maintenance strategies can significantly improve the operating stability of the unit and reduce the risk of unplanned downtime.

By the way, we have been supplying spare parts for power plants around the world for 20 years, and we have rich experience and hope to be of service to you. Looking forward to hearing from you. My contact information is as follows:

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