Double-precision filter for wind generating set gear case lubricating system

The utility model relates to a double-precision filter for a wind generating set gear case lubricating system which is a new construction of a filtering part for the wind generating set gear case lubricating system. The double-precision filter comprises a new nut cap (15), an upper cylindrical shell (16) and a lower cylindrical shell (17) from top to bottom, and the three parts are connected with each other in a spiral pattern; a flange which can be rotatablely screwed is arranged on the outer part of the new nut cap (15), and a round of horizontal constant head tank is arranged on the inner part of the flange; an opened oil inlet (5) is arranged on one side of the lower cylindrical shell (17), and a non return valve (18) with a downward exit is arranged on the bottom of the lower cylindrical shell (17); the core space of the double-precision filter is one of the two configurations which are parallel type filtering and tandem type filtering. By adopting the technology scheme, all of the parts of the filter can be detached, thereby reducing the processing difficulty, lighting the weight, reducing the cost, the installation difficulty, the maintenance difficulty and maintenance cost, and the technology also can replace the tandem construction filter core to satisfy the diversified demands at the same time.