What are the reasons for the friction of the static part of the turbine? 5

The above peers are all possible, add two points: one is the wear of each support bearing Ugin (you can use the settlement measurement tool provided by the manufacturer to measure the gap between the journal and the measuring tool during the overhaul without turning the tile, and then compare the value before installation or the measured value of the last overhaul, if the value becomes larger, that is, the bearing wear must be replaced by the tile), resulting in zero radial clearance between the rotor and the partition seal, and even to the degree of interference (bite to death), even if you turn on the top shaft oil pump, It is also impossible to move the rotor. The second is that the pressure between the top shaft oil pressure and each journal does not reach or exceed the design value (the manufacturer has the top shaft oil pressure of each bearing in the quality certificate (generally two ends, the middle is generally, the oil pressure is adjusted and then try (when adjusting the upper part of the journal to install a dial gauge to monitor the value).

One is that the large shaft is seriously bent, and the other is that the bearing is burned out of oil.

1. There are defects in design, manufacturing, installation, etc., which leave hidden dangers for the bending of the large shaft.

2. The uneven heating of the cylinder causes the temperature difference between the upper and lower cylinders to be too large, and the temperature difference between the inner and outer walls of the flange is too large, which may cause the thermal deformation of the cylinder and may lead to the disappearance of the radial clearance of the shaft end and the separator and cause friction.

3. The dynamic imbalance of the rotor itself. The rotor dynamic balance mass is not high or the rotor mass balance positioning is not perfect, resulting in abnormal vibration of the rotor during the speed increase, which may cause friction in the dynamic and static parts of the unit.

4. Before the hot start of the unit, the shaking degree of the large shaft exceeds the specified value, when the speed increases, the unbalanced centrifugal force increases, which will cause the unit to vibrate violently, and if it is not stopped in time, the bent rotor will inevitably aggravate the friction with the steam seal!

1. The voice is abnormal. If it's serious - there will be metal.

Rubbing sounds. zhi

2. If the system shaft is DAO

Vibration monitoring: If dynamic and static friction occurs, it will be reflected in the vibration record or trend, and the vibration will be large.

3. Generally, the distance between movement and static is controlled by thrust bearings; If static friction does occur, the shaft displacement should become larger.

(1) When the unit starts, the metal temperature difference between the upper and lower cylinders and the bending value of the large shaft must be controlled within the range required by the regulations;

2) During the start-up process, control the steam temperature rise rate, the metal temperature rise rate of the cylinder, the temperature difference between the upper and lower cylinders, timely input flange, sandwich heating device, etc.;

3) Strictly control the expansion difference and the value of the serial shaft within the limit value, and in some cases, the sudden increase of the expansion difference caused by the Poissan effect of the rotor should also be considered;

The tires of the car and the ground are static friction.

The reason for this is that the slight deformation of the tire and the ground contact, so that the center of gravity of the car rises and falls, when lifted from the lower center of gravity, the kinetic energy of the car is converted into potential energy, and when it is from a high place to the ground, the potential energy is converted into kinetic energy again. In this cycle, energy is lost, and it becomes heat energy from the tire and the ground, energy consumed by tire wear, and sound energy.