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Automatic Central Lubrication System for Wind Converters

The single line central lubrication system BEKAWIND Single was developed especially for operation in wind converters. It can be used for the lubrication of all kinds of bearings including main bearings, blade bearings and yaw bearings.

System Design
The drawing to the right shows the design and the operating principle of a BEKAWIND Single central lubrication system for 3 blade bearings with each 6 lube points. The system consists of an electrical piston pump EP-1RS, 3 UE distributors with each 6 outlets, a pressure switch with manometer and the necessary tubes and fittings.

The automatic lubrication system is controlled and monitored by the central controller of the wind converter. The lubricant is supplied as long into the main line, as the switching pressure of the pressure switch, which is situated at the end of the longest feed line, is reached.

To achieve the switching-over of the distributor, the pump and the 2/2 way solenoid valve are switched off to release the pressure line. The remaining lubricant is delivered back to the reservoir.

The automatic lubricating system is protected by a pressure relief valve with return flow to the reservoir. The reservoir is equipped with a level switch.

Electric Piston Pump EP-1RS

The electric piston pump EP-1RS was designed especially for the operation in wind converters.

Caused by follower piston in the reservoir, the pump can be installed in each position. If the pump is installed in rotating parts like the rotor, the follower piston should be supported by the centrifugal force.

The pump element with desmodromic drive and the agitator in the reservoir guarantee an ideal suction performance even under difficult circumstances.

Technical Data
Reservoir Capacity 4 / 8 / 20 kg
Maximum Operating Pressure 280 bar
Pressure Connection 10 mm
Lubricant Grease up to NLGI cl. 2
Number of Outlets 1
Delivery Rate 120 mm³/rev.
Position of Installation Each
Operating Temperature -20°C to +60°C
Level Switch Change-over Contact
Switching Current 1A – 60A
Voltage 12V DC, 24V DC, 115V AC, and 230V AC

Single Line Distributor Type UEN

The single line distributor type UEN consists of initial element, metering element(s) and end element.

The disk design of the distributor allows the compilation of the distributor disks with up to 10 metering elements to achieve an ideal adaptation of the lubrication to the requirements of the wind converter.

Caused by the piston control of the distributor, which needs no rubber parts, high system pressures are possible. The high reset force of the metering piston guarantees the operational reliability of the distributor even with long lines or low temperatures.

Technical Data
Delivery Rate Per Element 100 mm³/cycle
Lubricant Grease up to NLGI cl. 2
Operating Pressure Pmin: 200bar
Pmax 300bar
Temperature Range -10°C to + 60°C
Metering Elements 1 – 10