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The basic principle is that after the oil pump is opened, a certain oil pressure is established under the oil engine, so that the oil engine is lifted up, and the regulating valve is opened. When the regulating valve is to be closed, the drain pipe is turned on, the oil pressure is lost under the oil engine, and the regulating valve is closed under the action of gravity. It's a pity that I can't draw a picture on it, otherwise you will understand it at a glance if you sketch it, I don't know if I understand what I said.

Normally open means that when the command signal is not received, the switch is disconnected, and the switch is closed when the command signal is received.

The long closure is just the opposite.

It's a mistake. It is the temperature after measuring the sandwich and adjusting the stage. The purpose of measuring the sandwich is to monitor the temperature difference between the inside and outside of the cylinder and control the starting speed. After measuring the regulating stage, the temperature is basically equivalent to the metal temperature of the cylinder, in order to determine the starting mode of the steam turbine (cold state, warm state...).

The circulating water comes from the cooling water tower, and the cooling water is sent into the condenser with a circulating water pump, and the cooling water absorbs the vaporization waste heat of the steam that has completed the work in the steam turbine, condenses it into water, and then returns to its cooling equipment or cooling source for round-trip circulation.

Hydrogen cooling is commonly used in large units and is stronger than air cooling. The density of hydrogen is 1 10 of air, so the friction loss between the rotor and the gas and the ventilation loss of the generator can be reduced by 1 10Since hydrogen cooling is a closed ruler type, the insulating material in the generator is not oxidized, and there is no dust and moisture.

In addition, since hydrogen does not support combustion, there is no danger of fire when the insulation of the generator is broken.

Internal cooling water is the most advanced cooling method, it has a good cooling effect, can improve the power of the generator, reduce the structural size of the generator, save the amount of metal materials, etc.

After the steam has been cooled and condensed in the condenser, the steam that has done the work in the steam turbine is concentrated in the hot water well and sent to the deaerator in time by the condensate pump. When being sent to the deaerator, it first passes through the jet extractor cooler, the shaft seal heater, then into the low pressure heater, and finally to the deaerator.

Auxiliary oil pumps in a broad sense include all oil pumps except the main oil pump. I think you're asking about the lube pump. When the main oil pump does not work, use the starting oil pump or lubricating oil pump to maintain the operation, and when the starting oil pump trips, use the lubricating oil pump to work.

Generally, the lubricating oil pump is equipped with a backup power supply, which can maintain the operation of the steam turbine or shut down safely in the event of a failure of the main oil pump and the starting oil pump.

When starting the unit, an auxiliary oil pump is used to provide the power oil of the regulating system and the lubricating oil of the lubrication system.

During shutdown, when the main oil pump cannot supply oil normally due to the decrease in speed, it is used to supply lubricating oil to the lubrication system.

The shaft plus is called the shaft seal ** heater.

It is the use of the role of the steam jet extractor to round the steam leakage residue at the end of the steam turbine into the shaft seal heater, and use the heat of the leakage to heat the condensate rolling water.

If the drain is step-by-step artesian, the No. 1 high plus drain is artesian to the No. 2 high, the second flows to the third high, and the third flows to the No. 4 deaerator.

If the trap pump method is used, the No. 1 high plus drain is mixed with the main feed water after the heat exchange of No. 1 high plus through the trap pump, the No. 2 high plus drain is mixed with the main feed water after the heat exchange of No. 2 high plus through the trap pump, and the No. 3 high plus trap is mixed with the main feed water after the heat exchange of No. 3 high plus through the trap pump.

The so-called "cranking" refers to the use of manpower to rotate the motor several times before starting the motor, so as to judge whether the load driven by the motor (i.e., the mechanical or transmission part) is stuck and the resistance increases, so that the starting load of the motor will not become larger and damage the motor (i.e., burn out). Therefore, generally after stopping for a shift (8 hours), when the motor is started again, it is necessary to crank the car.

In the top shaft oil pump system, when the speed of the steam turbine is very low, there is no oil film formed between the journal and the bearing, and the journal will come into contact with the bearing. If friction exists, the journal and bearing may be bruised, and if there is no oil film, the rotor may shake when it rotates, which often causes the blades to vibrate.

In order to prevent damage to the steam turbine, reduce the cranking power of the steam turbine, and ensure the smooth operation of the cranking, the steam turbine is equipped with a top shaft oil system, a set of bearings for the low-pressure rotor, and the bearings of the high-pressure and medium-pressure rotors are tilting pad type, without the top shaft oil device.

Before the start of the turbine generator set, especially after the shutdown, the "cranking" device should be used to drive the large shaft to rotate, eliminate the stress caused by temperature changes, and prevent the large shaft from bending. The top shaft oil pump is to supply oil to the bearing when the large shaft is "cranking", fill the oil between the shaft and the bearing, and jack the large shaft to prevent the bearing from wearing.

If it is a vertical unit of a hydropower plant: the purpose is to adjust the level and force of the generator thrust bearing; The top shaft oil pump is to jack the generator rotor to make the thrust bearing surface enter the lubricating oil after the unit is shut down for a long time, so as to ensure the safe operation of the thrust bearing of the unit. Second, when the hydro turbine generator set is overhauled, the rotor of the top generator is used.

Turning effect: Before or after the turbine impulses the rotor, the steam entering or accumulating in the cylinder makes the temperature of the upper cylinder higher than that of the lower cylinder, so that the rotor is unevenly heated or cooled, resulting in bending and deformation. Therefore, before the punch and after the shutdown, the rotor must rotate continuously at a certain speed to ensure that it is evenly heated or cooled.

In other words, the pre-ram and post-stop crank eliminates rotor thermal bending. At the same time, it also has the function of reducing the temperature difference between the upper and lower cylinders and reducing the rushing torque, and can also check whether there is friction between the turbine maneuvering and static and whether the lubrication system is working normally before starting. Top shaft oil pump function:

The top shaft oil pump is used for the forced lubrication before the steam turbine crank, the rotor of the large unit is heavier, and the power of the crank motor is larger, and the top shaft oil pump can be used to jack the rotor before the crank of the unit to reduce the power of the crank motor.