Page 254 - Water Standards
P. 254
2) For rigid barring gear of thrust bearings, the load carried by each bearing liner
shall be preliminarily adjusted to be uniform and the deviation of the mirror plate s
levelness shall be less than 0 02mm/ m. Adjust the guide bearing liner gap on the
side of the thrust block; the gap shall be between 0 03- 0 05mm. At the same
time, other radial guide bearings shall not be in contact with the main shaft. After
the shaft s adjustment, the throw of the axial line of the generator unit shall be no
larger than the requirements of Table 4 2 8-5
3) At all events, the absolute throw of the hydraulic turbine s guide bearing shall
meet the requirements of Table 4 2 8-6
9 When the shaft throw has been adjusted to be qualified, the mirror plate levelness
shall be rechecked and the load carried by the thrust pad, the stator and rotor circularity and
the air gap shall meet the relevant requirements
10 The installation of the thrust bearing s oil groove shall meet the following require⁃
ments:
1) For the thrust bearing oil groove, kerosene leakage tests shall be done according
to the requirements of Item 15 of Article 4 2 2 in this specification.
2) For the oil groove cooler, pressure tests shall be done according to the require⁃
ments of Item 14 of Article 4 2 2 in this specification.
3) The axial gap between the rotating and fixed parts in the oil groove shall meet the
requirements of the jacking rotor and the radial gap shall meet the design require⁃
ments. When the groove⁃type sealing felt is put into the oil groove, it shall be
compressed by about 1mm and the contact between the sealing felt and shaft shall
not be too tight.
4) The oil retaining ring s outer circle shall be concentric with the generator unit and
the center s deviation shall be no larger than 1 0mm. The deviation between the
radial distance from the oil retaining ring s outer circle to the shaft neck s inner cir⁃
cle and the average distance shall be no larger than ±10%.
5) The height of the oil surface in the oil groove shall meet the design requirements
and the deviation should be no larger than ±5mm. The brand of lubricant oil shall
meet the design requirements. Oil quality shall be well checked before filling and
it shall meet the requirements of GB 11120.
6) Allowable insulation resistance of each part of a suspended generator unit s thrust
bearing shall meet the requirements of Table 4 2 8-7
11 Guide bearing installation shall meet the following requirements:
1) The load⁃carrying conditions of the generator unit s shaft and thrust pads shall be
adjusted to be qualified.
2) The hydraulic turbine s sealing ring gap and the generator s air gap shall be quali⁃
fied.
3) During the final installation of a segmented guide bearing liner which has
insulation requirements, the insulation resistance shall be above 50MΩ.
2 4 7