Structure, function and working principle of the balance disc The balance disc is composed of inner and outer discs. The inner disc is made of aluminum alloy and assembled on the shaft. Besides rotating with the shaft and moving axially with the shaft, it is also called Floating balance plate. The outer disc is made of forged Steel and is divided into two disc bodies, namely a balance disc outer casing I and a balance disc outer casing II, which are respectively fixed on the balance disc partition by screws, and the inner and outer discs are opposite to each other in the radial direction. Its function is to balance the axial force generated by the high-speed rotation of more than ten stages of the impeller on the rotor or the axial imbalance force due to the change of the inlet and outlet pressure difference. The balance force and the axial force are equal in magnitude and opposite in direction, thereby preventing the rotor from swaying (mainly preventing the rotor from swaying toward the inlet) and maintaining the balance of the rotor.
The design of the turbine balancer of the turbine cycle compressor is different from that of the general compressor. Due to the sealing teeth between the inner and outer discs, when the compressor condition changes, the rotor generates axial displacement, and the gap between the seal teeth S1 and S2 on the corresponding step of the balance disc changes, causing the balance chamber pressure P3 to change, thereby balancing The axial force reaches the axial displacement of the control rotor. When the rotor moves to the right, the balance disc also moves to the right, the seal tooth gap S1 increases, S2 decreases, the gas leakage amount increases through the gap S1, and the gas leakage amount flows through the gap S2, resulting in an increase in the pressure P3 in the seal chamber. Large, so that the balance force A is reduced until the balance force A = the axial force F, at which time the rotor returns to the equilibrium position. When the rotor moves to the left, the process is reversed.
The key points of the balance plate manufacturing and assembly process are based on the balance disc structure and the principle of action. The balance disc and its outer casing must ensure the same shape and equal spacing of the seal teeth during the manufacturing process. The outer diameter of the balance disc seal teeth and the inside of the balance disc seal teeth The gap between the teeth should not be too large, and the control coaxiality should not be too bad.
As shown, during the assembly of the balance disc, the axial clearances S1 and S2 of the control disc seal teeth and the balance disc outer casing (I, II) are 011 mm, which must be floated before the bearing bushing is installed. The balance disc and the balance disc jacket are fixed in the middle position. Note that before installation, first use the depth vernier to measure the relevant dimensions of the parts. During the installation process, the large balance of the floating balance plate is required to be lower than the balance plate outer casing II tooth seal 011mm, the floating balance plate small tooth seal is higher than the balance plate outer cover I tooth seal 011mm In this position, the upper end surface A2 of the floating balance disc is required to be in the same plane as the end surface A1 of the balance disc outer casing A, and the tolerance of the A2 surface and the A1 surface is not more than 0103 mm, and may be adjusted by a washer if necessary.
When the balance disc cannot balance the axial force, an accident is likely to occur. Some users, especially new users, the process of the new system is not stable, or the balance plate and the balance plate have a long service life, so that the balance plate cannot balance the axial force and cause equipment failure.
The function of the thrust plate and the assembly point are usually only when the parking is stopped and the working condition is abrupt. In normal operation, the thrust plate is in the middle position of the thrust pad. In the initial installation, the thrust plate must be assembled. In the middle position of the thrust pad, the front and rear gaps of the impeller and the diaphragm are approximately equal to ensure that the turbine can work normally under abnormal conditions and balance the axial force.
The key to choosing a radial bearing is the importance of selecting the right radial bearing during use of the turbine cycle compressor. The radial bearing grades of the motor and compressor are 4E32317H and 4E32314H, respectively. The accuracy grade is E grade, and the grade G is substitute.
On-site assembly of the inner part and the outer casing Before the inner part of the turbine is inserted into the outer casing, the external mechanical operation test shall be carried out. The mechanical operation test shall be carried out for 1 h. The bearing temperature shall be measured during the test run. When the room temperature is less than 25 ° C, the maximum temperature of each bearing is allowed to be no more than 85 ° C. When the room temperature is greater than 25 ° C, the maximum temperature of each bearing is allowed to be no more than 95 ° C. When testing the test, the motor insulation is not less than 015MΩ. At the same time, pay attention to observe whether there is abnormal noise and vibration during mechanical operation. Assembly with the housing is possible without exception.
Conclusion Through the control of the key points in the above links, the new factory TC620 turbine circulating compressor has better adaptability to the unstable process conditions of the new system during the driving process, reducing the exploration of the new system during the driving process. In the link, the success rate of driving once is greatly improved, which brings direct economic benefits to the normal operation of users, and is highly praised by new and old users.
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