FIELD: machine building.
SUBSTANCE: group of inventions relates to wells drilling, namely to pressure compensation systems for bearing assemblies with oil seal. The bearing section of the bottomhole motor contains elongated spindle installed coaxially with elongated cylindrical casing, having longitudinal axis, and with possibility of rotation in it. The spindle has external surface, and casing has internal surface. The bearing section additionally includes a ring oil tank located in radial direction between the external spindle surface and internal surface of the casing, and passing in axial direction between the top rotating seal and bottom rotating seal, each of them is located in radial direction between the spindle and casing, at that part of the oil tank creates the ring chamber of the bearing; compensation system to compensate the oil pressure containing: cylindrical sleeve with internal cylindrical surface, and external cylindrical surface, and located coaxially with external cylindrical surface of the spindle in area located in axial direction above the bearing chamber, at that the sleeve is connected without possibility of rotation with casing with creation of the ring piston chamber between the external cylindrical surface of the sleeve and internal cylindrical surface of the casing, at that the spindle is made with possibility of rotation relatively to the sleeve, and compensation system additionally contains: round collar made in bottom end of the sleeve connecting the specified sleeve with casing and containing crude oil channel ensuring possibility of the lubricating oil passage through it, radial bearing between the internal cylindrical surface of the sleeve and external cylindrical surface of the spindle; and ring piston located in the piston chamber without possibility of rotation and made with possibility of movement in it in axial direction and containing internal surface interacting with the external surface of the sleeve ensuring sealing, and external surface interacting with the internal cylindrical surface of the casing ensuring sealing.
EFFECT: radial support of the spindle is ensured.
20 cl, 4 dwg
