Almost all low-speed large-scale synchronous motors and pumps are used in the selection and manufacture of traditional medium and large-sized tubular pumping stations. However, the use of large synchronous motors has many shortcomings such as large size, complicated structure, large maintenance workload and high price. At the same time, the starting process is complicated and the faults are many. The matching electrical equipment and protective equipment are also complicated, and the pump is invisibly added. The cost of the host device. When the cross-flow pump of the bevel gear transmission selects the motor, it refers to the favorable range of the foreign selection motor. At the same time, because the Yancheng cross-flow pump is mainly used for flood control, the motor as the power source of the pump station is short-term operation and has no anti- For the requirements of power generation, the YL series 10kV high-voltage vertical dry motor was selected. The motor is installed on the basis of the second floor, the motor does not need to be waterproofed, and the stator winding is made of Class F insulation material and the whole vacuum pressure immersion paint (VPI). The motor adopts a box structure, which is light in weight, good in rigidity, high in performance index, low in noise, small in vibration and good in reliability. When the structure is designed, the motor does not bear axial force, which greatly improves the service life of the motor. The stator is fitted with a slide-in outer press. In the manufacturing process, it is necessary to pass several times of pulse voltage test and ground pressure test to ensure that the insulation performance of the motor is excellent and reliable, and the moisture resistance is strong.
According to the design parameters of the pumping station, the gearbox should use large modulus, large diameter, high precision, hard toothed gears for gear reduction. In order to make the whole transmission system achieve the requirements of stable transmission, low vibration, low noise, strong bearing capacity and large peripheral speed, the bevel gear transmission is adopted. The gear transmission has high bearing capacity, stable operation, low noise, and due to assembly error and The influence of gear tooth deformation on the eccentric load is small, and the transmission efficiency is as high as 98 or more.
The whole gearbox is immersed in water. The outer part of the box is a flowing liquid. The flow rate is more than 0.5m/s. The airtightness test is carried out on the part of the box. The test pressure is 0.2MPa. The box is equipped with a pair of 90b orthogonal drive bevel gears. The shaft is vertical, the output gear shaft is horizontally mounted, coaxial with the water pump, the material of the gear is 20CrNi2MoA; all bearings in the gearbox are made of SKF products, the input shaft bearing is a single row cylindrical roller bearing and two back-to-back installation Tapered roller bearings. The output shaft bearing adopts a single row roller bearing and a set of double tapered roller bearings. The gear and bearing are lubricated with N220 medium load industrial gear oil; a self-aligning ball bearing is also arranged at the impeller end. This bearing adopts ZL-4 Lithium-based grease lubrication, this preparation can not only withstand the forward and reverse subversion torque, but also has good positioning performance, which can meet the force requirements of the cross-flow pump.
The hydraulic design of the cross-flow pump head is generally low, but when used for flood control and pumping station, the range of head change is very large; when designing the pump, it is necessary to ensure that the pump can run stably under the head of the highest device, that is, the operating point is not in the performance curve. The saddle-type area is in the high-efficiency area at low lift, thus achieving stable, safe and efficient operation under high and low lift operating conditions. The protection system is to implement pump linkage and remote control to facilitate the normal operation of the pump. In the design of large-scale tubular pump, a series of protection functions are set up. These protection functions are output to the electric control cabinet through various signals, and are in the 2000QGL100 type. There are four protection functions in the design of the flow pump.
Large-scale tubular pump protection function protection function installation position protection name signal output over-temperature protection motor three-phase winding internal PT100 analog quantity 420Am shaft temperature protection motor upper and lower bearing PT100 analog quantity 420Am shaft temperature protection gear box input and output bearing PT100 simulation The amount of 420Am leakage protection oil chamber cavity leakage alarm switch volume above the protection and control cabinet in the pump to implement joint control, effectively protect the motor and water pump. Remote control can be implemented to solve the abnormal operation of the pump due to various problems.
Installation points The cross-flow pump of the bevel gear transmission is separated from the motor by the pump. The overall structure is compact, the lifting height is low, and the pump station investment is saved. Only the assembly of relevant components and the alignment performance of the coupling can be performed on site. The installation sequence is as follows: (1) pre-buried bottom plate and anchor bolts, fixed rail seat, and horizontal alignment; (2) coupling water inlet end, water outlet end expansion joint and water pump; (3) installing pump unit, fixed pump bottom (4) use the positioning sleeve to install the lower coupling, connect the lower coupling and the gear box; (5) install the upper coupling with the positioning sleeve, connect the upper coupling and the motor, pay attention to the transmission shaft (6) fixed motor and basic steel frame; (7) connect various protections into the control system for computer supervision; (8) carry out no-load operation, the running time must not exceed 5min; (9) after the dry operation is normal , the motor and the foundation are marked with a positioning pin; (10) the pump and the basic species are marked with a positioning pin.

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