Brief Introduction to Hydraulic Top Rotor of Vertical Water Pump Unit

Device introduction and main technical parameters System consists of the top ring, jack, tubing system, hydraulic valve, fuel pump, control cabinet and other components. Control cabinet with pump start and stop, hydraulic valve position, over pressure protection, jacking stroke indication and other functions. The oil pump is composed of 20l oil tank and plunger pump , the maximum pressure is 32MPa (working pressure 16MPa, flow rate 1L / min, motor power 1.5kW, etc. The hydraulic valve adopts M type hydraulic valve, model HD-3C6-G02-LW, Grade 60MPa. The tubing system adopts DN10 × 2 seamless steel pipe, the pressure rating is 70MPa. The jack adopts 4 sets of 60 plungers with stroke of 50mm and pressure rating of 60MPa, single overhead load≥8t. Rotor lifting height of 5 ~ 8mm According to the motor structure , The device is set to 7 ± 0.5mm. The top ring is a dedicated design of parts. The lifting rate of the device is 15mm / min, holding time 5min, falling speed 20 ~ 30mm / min, , But also can be adjusted according to the needs of a single unit from the top.Key technical measures 1, the top ring due to the outer rotor flange surface of the counterweight, coupled with the actual situation of space layout, jack can not directly lift the rotor, and therefore set A top ring lifting jack ring from the jack, the top ring and then lift the rotor Top ring must ensure that the parallel lifting requirements to prevent the top of the top flange of the lower flange welding 4 Ring pad, set in the jack plunger, so that the top ring positioning. 2, to prevent the top of each unit set 4 jack, through the top ring, jack stroke control, and the use of equal pressure oil, to ensure that each Jack pressure equalization, to avoid the jacking caused by the difference between jacking force and jacking speed .3, to prevent the rotor from falling too fast When the rotor is down, to prevent the speed too fast, causing impact and damage the thrust bearing tile surface, the crew into the oil Valve with throttle type, easy to adjust the rotor down speed, control in 1 ~ 2min. 4, jack jack limit by the full stroke design to prevent the rotor from rising too much. 5, to prevent the tubing into the gas, the fuel tank, fuel pump The highest point in the system  motor layer on the ground, so as to effectively prevent the tubing system due to long-term deactivation of the intake problem .6, the hydraulic valve forward fuel supply, jack jacking. Reverse fuel supply, jack Reset. In the middle position, the tubing system holding pressure, jack to maintain the position of these functions to meet the rotor jacking up, the need to maintain a certain time is generally 5 min and the need to be forced to reset after jacking 7. Electrical control 1 jack stroke indication Each jack has a lift and reset travel switch and indicator lights in place and a pilot lamp test button to check if the pilot lamp Normal 2 system over-voltage protection with double protection of relief valve and pressure relay When the system pressure reaches the set value, overflow valve overflow If the system pressure exceeds the set value of a certain range, the pressure relay action, hydraulic Valve back to the middle position, the pump stops running, at the same time, over-pressure indicator light 3 System working pressure calculation Jack jack pressure: P0 = W / nxs Where: P0 jack jack lift kg / cm2 W weight of the rotor kg n - the number of jacks S - jack area of ​​piston cm2 P0 = W / nxs = 15 × 1000 / [4 × (3.1415926 / 4)] = 132.6kg / cm2 Relief valve working pressure: PV = 1.2 ~ 1.3P0 PV should be set to meet more than three normal work jack before lifting the rotor requirements, to avoid two top-off. Overpressure protection relay working pressure: PK = 1.1PV 4 power supply. Working power 220V, travel switch with 24V, in order to ensure safety. Application prospect The device has been successfully applied to Luo Yu pumping station 6 630KW pump rotor top rotor project, received a convenient and reliable use of the results. The device focuses on solving the actual situation that the rotor structure of the motor is irregular, the space layout is complicated and the simple lifting structure can not be used. The device can be widely applied to the more complicated top rotor projects in the fields of water supply and drainage, electric power, chemical industry and so on, and provides references for the design and calculation of other types of top rotor devices.