Steam turbine radial bearing is divided into fixed bearing two types of bearings and tilting watts.
1, fixed bearings with cylindrical bearings, bearing fixed watts oval tile bearing, oil is woven more and more oil bearing (
Currently not used)
。
Ordinary cylindrical bearings, is composed of upper and lower half.
The second half of the bearing in vitro has three radial adjusting pad, the upper bearing at the top of the set, a radial adjusting pad for bearing adjustment.
Oval tile bearing is self-aligning bearing, has the advantages of less structure on the level in direct casting babbitt bearing the body appearance, will be tile surface processed into elliptical bearing.
2, tilting bearings, bearing four tilting watts in the upper two segment's back, along the steering oil place with spring, make the segment in the back pressure to the tendency of the rotor, avoid the inlet side of the segment and shaft neck brake of undesirable tendency, at the same time in the tile surface feed side inclined, and smooth oil into the tile surface.
Half of round, the second half of the tilting composed of two pieces of tilting tile tile bearing, the structure of bearing stability is better than cylindrical bearings, bearing capacity than the general big tilting tile bearing, and tilting tile of partial load bearing and wrong ZhongMin rational teaching the advantages of small.
Is a new type of tile surface oil inlet side into the tank with tilting tile bearing, smooth oil with the method of direct oil supply and oil discharge.
Each segment has a into the tank, after working in the tile surface smooth oil directly discharge, has less power consumption.
1 combined with radial thrust bearing thrust bearing the classification of the structure features was put in a body, the radial and thrust bearings bearing is spherical to match corresponding spherical and bearing sleeve body, make the bearings and automatically adjust the deflection of the shaft deformation demand, arrived on the tile surface and the rotor thrust plate has good contact between appearance, the structure is suitable for the flexible rotor and axial load is not too much of a unit.
Another for elastic balance type of tile radial thrust bearing, thrust segment is placed on the elastic ring, hosted by elastic ring to produce elastic deformation, in order to reach each piece of tile surface and thrust plate plane have a good contact with the request.
This kind of structure used in rigid rotor and the axial load is not too much of a unit.
2 mirra ginsburg ray tile symmetric bearing, thrust bearing can be used for positive and negative two to work.
Bearing a degree contact maintenance inspection between bearing housing and bearing contact area is more than 75% on average, each adjustment between gasket and block and gasket between the segment and contact status of the contact area is more than 75% on average, the tilting pad and the corresponding spindle, contact area is more than 80% on average.
If bearing is in the correct position, along the line of the radial and axis rotation bearing about 2 to 4 degrees, the movement should be stop one step at a time, and each direction can only move a little bit at a time, to prevent move quickly, otherwise the appearance of the contact pattern does not reflect practice situation.
If repair blows demand big workload: tinker, polished than the repair work with high efficiency.
Should be very careful when we finish to stop in order to prevent the shell geometric distortion, it is very important.
Can use blade grinding wheel to grind the spherical shell, and introduce the use of grinding particle size is 160 -
180.
When finishing introduce use the scraper.
The main steps of the adjustment of the tilting tile bearing (2
1)
On the need of the rotor adjustment data to calculate the second half of the tile the thickness of the gasket needs adjustment.
For example, if want to raise the rotor 0.
20 mm, the gasket must be adjusted around the second half of the two pieces of changed into thicker than the original gasket 0.
20×0.
7 = 0.
14 mm gasket (
After processing the spare gasket)
；
If want to put the rotor moves to the right 0.
20 mm, the grinding lower right gasket to 0.
20×0.
7 = 0.
14 mm, lower left again at the same time adjust the gasket changed into thicker than the gasket 0.
14 mm gasket (
After processing the spare gasket)
。
（
2)
After the second half of the tile adjusting shim thickness changes, in order to ensure the bearing clearance is changeless, shall be adjusted accordingly changes the upper segment of diagonal azimuth gasket.
# 3, for example, the adjustment of the tile spacer thickening of 0.
14 mm, the # 1 tile adjustment gasket should correspondingly thinning is 0.
14mm（
As shown in figure)
。
3 bearing clearance value measurement about fixed tile bearing or feeler stop measurement of lead wire, can be used on tilting tile bearing can adopt the following measures to stop measurement.
To measure the size of the rotor and bearing the parts separately, and make corresponding records, detailed steps are as follows: (
1)
Measurement of the rotor shaft neck diameter: select multiple locations to stop measurement, take its uniform value, compared with the drawing design value, should be consistent.
（
2)
Measurement of bearing inside diameter: bearing shell by shell inner hole diameter size minus the tile with block and its total adjusting shim thickness are found.
Inner hole: 1) measurement shell shell half bolted to split up and down, and according to the rules of the torque screw down the bolt, then the measurement, measurement # 1, # 3 block in diameter, # 2 and # 4 block in diameter.
(2), respectively, measure # 1, # 2, # 3 and # 4 segment with block and adjust the thickness of the gasket assembly.
As shown in figure 2.
Can be put on the spindle (the tile buckle
Spindle diameter greater than or equal to the rotor shaft neck, less than or equal to the segment diameter)
, with standard samples and measurement by table.
For double cylinder block surface, thus measurement necessary measure to its highest point.
（
3)
According to the measured data calculated bearing clearance, bearing clearance equal to the shell inside diameter minus the tile thickness minus rotor shaft neck components.
The overhaul the thrust segment of the thrust bearing thrust surface should be fairly flat, and contact with the rotor thrust plate of average, contact area of more than 75%.
Same side thrust segment and spherical block combination after the total thickness of the bias is not greater than zero.
02mm。
