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Wind turbine bearings to introduce a new standard

08-10-13

With wind turbine bearings can generally be divided into three categories, namely: yaw bearings, the paddle change bearings, bearing drive system (spindle bearing and gearbox). Yaw bearings installed in the cockpit and the tower of the junction, changing bearings installed on each propeller blade and the root hub to connect the site. Each wind turbine equipment with a yaw bearing and bearing three sets of oars change (part-megawatt-class wind turbines for the following non-adjustable blades, there is no need for change bearing paddle).

1, code-named methods

Yaw wind turbine, paddle bearing the code change methods used JB / T 10471-2004 wheel bearings in the code, but in the wind turbine yaw, paddle bearing change occurred in a four-point double-wheel contact ball bearings, The structure of the bearings in the code of JB / T 10471-2004 is not provided, in this double standard have been added to the four-point contact ball bearing wheel of the code. As the single-row four-point contact ball bearing wheel structure of the code by 01 said that while the structure of the code 02 is double that of the ball diameter wheel bearing structure that provides 03 two-row four-point contact ball bearing wheel structure.

2 technical requirements

2.1 Materials

Of the standard deviation, change paddle bearing rings of material selection 42CrMo, quenching and tempering heat treatment used as a whole to deal with, after quenching and tempering hardness 229HB-269HB, part of the raceway surface quenching, quenching hardness 55HRC-62HRC. As the wind turbine yaw, change paddle bearing the complexity of the situation by force, and bearing bear a greater shock and vibration, bearing not only bear the impact of the requirements, but also to bear a greater load. Wind turbine life requirements of the host for 20 years, bearing the cost of a larger installation called yaw, and change them to meet paddle bearing life of 20 years. Bearing such as the hardness of the matrix 229HB-269HB, able to withstand the impact without plastic deformation occurred at the same time part of the raceway surface hardness reached quenching 55HRC-62HRC, can increase the contact fatigue life, so as to ensure the use of long-lived bearings request.

2.2 low-temperature impact energy

Of the standard deviation of the change paddle wheel bearing rings impact energy requirements of low temperature: -20 ℃ Akv not less than 27J, under cold Akv value can be determined in consultation with users. Wind turbine could work in very cold areas, the ambient temperature as low as -40 it around, bearing operating temperature of -20 ~ C in about bearings in the low-temperature conditions required to withstand a large impact load, therefore, require bearing rings The material in the quenching and tempering treatment must be done after the low-temperature impact energy test, check bearing rings on the part of the make-like pieces or rings with the same performance and the same kind of heat treatment under the conditions of the pieces in the -20 ~ C environment, so the impact Gong trial.

2.3 bearing ring

As the wind turbine bearings of the transmission accuracy is not high, but relatively large diameter ring, the more gear module, the general requirements of the precision gear GB/T10095.2---2001 according to the level of 9 or 10. However, due to the work of state and pinion gear bearings between the impact, ring bearing the tooth surface to be quenched, the small gear tooth surface hardness in the general 60HRC, taking into account life expectancy, such as design, the gear tooth surface hardening of the provisions of hardness For no less than 45HRC.

2.4 Clearance

Yaw, the change in the paddle bearing clearance have special requirements. Compared with the yaw bearings, change the paddle bearing a greater impact load, the wind shook the leaves are large, it changed the requirements of the paddle bearing clearance clearance should be zero or slightly negative clearance value, so that in case of shock Under the micro-bearings to reduce wear and tear. Yaw bearing requirements for the clearance of small value, that is, 0-501 ~ m. In addition, due to the wind turbine yaw bearing and change the rotation by the propeller-driven motor drive, and bearing in negative clearance or clearance under the state should ensure that drivers can drive motor, bearings in the assembly after the no-load need to start measuring friction Torque, torque value based on the specific host of different drive systems are not the same.

2.5 embalmed

Wind turbine equipment in the field, and yaw, the change was part of impeller bearing nude exposed, will be subject to air pollution, high humidity environment will be corrosion-bearing body, naked and exposed the become oar bearing deviation The site of call for anti-corrosion surface treatment, generally used to deal with zinc. According to the needs of the painting for Galvanized outer layer protection to deal with.

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