- DL5190.3-2012电力建设施工技术规范第3部分：汽轮发电机组（英文版）
- 中国电力企业联合会
- 535字
- 2021-04-01 14:06:23
6.5 Centrifugal Main Oil Pump
6.5.1 Inspection and assembling of centrifugal main oil pump shall comply with the following provisions，as shown in Fig.6.5.1:
Fig.6.5.1 Structure of typical main oil pump
1-lower half oil pump casing；2-sealing ring（left screw）；3-locating screw；4-sealing ring（left screw）；5-locating ring；6-upper half oil pump casing；7-vent plug；8-pump wheel；9-wearing ring；10-locating screw；11-pump wheel lock nut；12-sealing ring（right screw）；13-sealing ring（right screw）；14-"O"ring；15-bush ring；16-"O"ring
1 The pump casing horizontal joint surface shall be in tight contact，and after 1/3 bolts are tightened，there shall be no gap when checked with a 0.05mm feeler gauge.
2 The fitting between impeller，shaft and connecting keys shall be tight without looseness.
3 The lock nuts for fixing the impeller axial position shall have device to prevent loosening.
4 The radial run out of journal shall be less than 0.03mm，and the radial run out at impeller seal shall be less than 0.05mm.
5 The clearance between impeller sealing ring and pump shaft oil seal ring shall comply with manufacturer requirements，there should be no condensation force between sealing ring a nd housing，and its clearance value shall not be greater than that required by manu-facturer.
6 The axial clearance between sealing ring and impeller end should be 2mm-3mm；for a unit with rigid connection of main oil pump shaft and turbine shaft and the turbine thrust bearing in middle bearing pedestals，the cold state adjustment of axial clearance shall take into account the relative expansion value of HP rotor in hot state.
7 Inspection of bearing pad shall comply with the relevant provision in 4.5.1 of this part，bearing pad clearance and tightening force shall comply with manufacturer requirements.
8 The main oil pump outlet check valve shall operate flexibly without jamming.
9 Inspection of couplings shall comply with the relevant provision in 4.6.3 of this part.
6.5.2 Whole piece of steel adjusting shim shall be used for pump casing bottom and bearing pedestals joint surface，when there is oil circuit passing through the joint surface，the contact around the pressure oil port shall be homogeneous.After tightening 1/3 bolts，the joint surfaces shall be free of gap when checked with a 0.05mm feeler gauge.
6.5.3 The permissible deviation and compensation value for centering of main oil pump rotor and turbine rotor couplings shall comply with manufacturer requirements.When anti-vibration shaft is used for the main oil pump，the solid shaft and hollow shaft sleeve shall be adjusted concentric and be fixed before centering.
6.5.4 With rigid connection of main oil pump rotor and turbine rotor，the shaft ending run out at the main oil pump oil inlet side oil seal shall be checked，and it must not be greater than 0.05mm.When adjusting turbine rotor steam seal cavity center，a check shall also be made for the center of main oil pump rotor in pump casing，and the clearance of sealing ring shall comply with specification.