Pump assembly should be carried out before the inspection parts, parts with the surface, especially the mechanical seal friction surface should be cleaned, the sealing surface should not have obvious scratches and cracks, bumps and other defects, if the above defects should be replaced. Assembly: The oil deflector pressed into the motor shaft, the seat bolted to the motor. Apply the lubricant such as Vaseline to the rubber ring of the mechanical seal static ring, press the static ring assembly into the middle of the shaft, apply clean grease on the sealing surface, install other sealing parts, install flat key, impeller and Stop washers and tighten with bolts. CAUTION: Seal rings on the stationary seal of the mechanical seal tend to deflect during installation. This will result in leakage of the seal and should be carefully inspected during installation. Apply moderate amount of grease to the sealing end of the center seat and install the O-ring. Install the O-ring, the ring easily fall off and fold, be careful not to cause oil spills Lifting the motor assembly, the impeller down, slowly set into the pump body, and then bolt fastening, install the tube blockage and deflation screw Plug Rotate the rotor by hand to check for any stuck phenomenon. Disassembly: Follow the installation reverse procedure. Note: When removing the mechanical seal, YCB arc gear pump can not be directly hit the static ring with a hand hammer or a hammer, gently tap the wood and slowly remove the static ring. If the accumulation of dirt caused by demolition difficulties, should be cleaned and then disassembled. Installation, operation and maintenance of the unit: Installation: When installing, the place nearest to the liquid should be selected, and the pump should be installed at the suction pipe with the minimum suction height and the shortest distance. Attention: The distance between the unit and the surrounding obstacles should be ensured More than 150㎜, make the motor fan have enough air source. When the pump is used where the vibration is more stringent, you can use the shock absorber (pad), according to the manufacturer's instructions for installation. Pipeline installation should be reliable fixed, close to the pump flange pipe support should be sufficiently rigid, not to allow the pump to withstand the weight of the pipeline pressure. Install the pump unit to avoid direct sunlight and rain. Pump inlet pressure gauge should be installed, outlet flange pressure gauge should be installed to observe and control the operation of the pump. Pressure gauge range should be 2 to 3 times the actual pressure is appropriate. Pump inlet and outlet piping should be installed gate valve to facilitate maintenance and operation of the regulation. Wiring: must be the correct nameplate requirements wiring, wiring, the terminal must be solid, not allowed to loose, otherwise, will result in poor contact caused by lack of phase burning machine. To ensure the reliable operation of the motor, the electrical switch should be fitted with overload protection device and adjust the size of the protection device according to the current requirements on the motor nameplate. Warning: If no overload protection device is installed, the motor will be burnt out due to overloading when the oil outlet valve is fully open, when the large flow rate is running or under some circumstances the current suddenly increases. In the suction state (the oil level is lower than the impeller axis or the oil level is lower than the axis of the suction pump), the standard atmospheric pressure, the installation of the pump H = 10- (NPSH) r-0.5-hw, hw for the suction pipe resistance Losses (The unit of measure in the formula: m). If pumping oil from the sump, the length of the straight pipe before the suction inlet of the pump should not be less than 3 times the diameter of the inlet. The depth of the suction nozzle immersed in the oil surface should be more than 1.5 times of the inlet diameter and not less than 500㎜. The distance from the suction nozzle to the wall should be more than 1.5 times the caliber and 1.5 times the caliber from the bottom and not less than 500㎜. The total area of ​​the filter screen should not be less than 2 ~ 3 times of the suction nozzle area . Note: The suction pipe section of the pipeline installation should be anti-oil flow direction slightly downward tilt, to prevent nest gas. In order to facilitate the start before filling the pump oil, the check valve can be added at both ends of a bypass valve, insulation arc gear pump in the pump before opening the bypass valve to pump oil filling, closed after filling, easy to use . For high-rise building oil supply or export pressure is greater than 0.2MPa pump, in addition to the discharge gate valve installed, but also between the pump outlet and the gate valve with a check valve to prevent sudden power failure caused by high pressure oil return impeller damage. Operation: Open the inlet valve and bleed plug, close the outlet gate valve, and close the bleed plug after filling the pump with oil. Before starting, use a screwdriver to dial the pump fan and check if the motor is running flexibly. Jog the motor to determine if the direction of rotation of the pump shaft matches the direction of rotation on the pump (clockwise from the motor end). Warning: It is forbidden to try running the pump without oil to avoid mechanical seal damage. When the gate valve is fully open and the gate valve is closed, start the oil pump and open the pressure gauge. Gradually open the outlet gate valve until the required operating condition (the operating time should not exceed 3 minutes when the outlet gate valve is closed), and pay attention to the current Not exceed the rated current. Note: The operating conditions point flow is not greater than the performance of the table given in the large flow is appropriate, running, the actual head H = (P -P into) /0.0098 should not be less than the performance of the table given in the large flow point Corresponding to the appropriate head (P in the formula for the value of the outlet pressure gauge, P into the pump flange flange pressure gauge value, pressure unit: MPa, head unit: m). The ideal and efficient operating condition is the mid-point given in the performance chart, which can be adjusted by observing the inlet and outlet (vacuum) gauges. In the device (pipeline) curve has been set, if you want to adjust the pump operating conditions, YHB-LY series vertical arc gear pump is better by changing the speed or adjust the diameter of the impeller, the implementation of the program Please consult the manufacturer. Shutdown sequence: close the discharge valve on the gate ---- motor --- pressure gauge. Maintenance: Should check the smooth operation of the process, the mechanical seal wear and leakage, the timely replacement of seals to prevent the pressure oil into the motor. Often check the motor housing temperature changes, the pump is running, the motor temperature allows up to 80 ℃, if necessary, to further check the motor current overload and three-phase current imbalance phenomenon. Regularly check whether there is any change of floats and oil level in the oil inlet tank. If the oil inlet tank drops below the minimum oil level, the pump should stop running to avoid cavitation and damage the impeller. When necessary, adjustable gate valve, appropriate to reduce the pump out of the oil, and promote oil pool oil level rise. Pay attention to changes in pressure gauge and ammeter, found abnormal, take appropriate measures in time. When the pump is deactivated for a long time, drain off the oil, remove the scale, and apply anti-rust grease.
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