Axial Submersible Pump Francis Submersible Pump

Model significance: ZQ2850-4 HQ2850-4 ZQ - Submerged Axial HQ - submersible mixed flow pump 28 - pump water caliber 1/25. 50-- pump specific speed of 1/10 ns (when ns = 250-990) or 1/100 ns (ns = 1000-2400 when the time). 4 - the pump speed is equal to the number of pole pairs of the motor Asynchronous four pairs (or 8 poles) when (or synchronous) speed. Features: a wide spectrum range, complete specifications, reasonable layout, affordable, user-selective large. Pump diameter: 300-1600mm single flow range: 0.12 ~ 11m3 / s lift range: 1 ~ 24m Supporting power: 11 ~ 2000kW voltage: 380V, 660V, 6kV, 10kV structural features 1, submersible motor is fully submerged motor, protection rating to IPX8, insulation class F, temperature rise class B assessment. 2. Seal: Submerged Axial sealing include static seal and dynamic seal. Static seals are O-rings, seals for the mechanical seal. Submerged Axial prescribe mechanical seals, mechanical seal are water chamber and mechanical seal oil chamber. Material mechanical seal first direct contact with water is generally tungsten carbide and tungsten carbide. The second track machine called the oil chamber is sealed, the material is usually silicon carbide or tungsten carbide graphite. 3, leakage protection: oil chamber, motor cavity or junction box with a water probe and float switch, when there is leakage of water seepage when an alarm or shutdown, retention fault signal and other functions. 4, overheat protection: submersible motor winding has thermal element, when the temperature exceeds a predetermined value, the signal or stop. 5, cable selection sewage resistant heavy rubber-sheathed cables, their mechanical strength and excellent stain resistance, the cable is based on the ambient temperature 40oC, long-term work conditions selected, its current carrying capacity sufficient desire of longer life . Cable gland Cable clamping ring, so that a reliable seal between the cable and wiring compartment. The cables are secured to prevent the pull-off, cable rigorous grounding, safe and reliable. 6, the bearing carrier security configuration to ensure the smooth operation of the pump, long service life; famous bearings, reliable quality, use thrust bearing load, ensure reliable whole pump. The main quality control points according to GB / T13008-91 standard, axial flow impeller parts do static balance, accuracy of not less than 6.3. The main quality control points to withstand the pressure of 1.5 times the working parts of the hydrostatic test pressure to do, but not less than the minimum 0.2Mpa, 5 minutes without leakage. Motor parts assembled, the motor unit to suppress the test, no leakage suppression process. Rotor dynamic balance, motor manufacturers to test the performance of the motor shall comply with the corresponding national standards. The main quality control points after hydraulic tests assembled, for axial flow pump performance test, head, flow and other parameters meet user requirements. QZB diving axial flow, QHB common failure of a mixed-flow pump can not be started (or will not start, or start difficult) reasons: 1, does not have the starting conditions; 2, phase; 3, electrical protection circuit fault; 4, blade stuck , the torque is too large will not start; 5, winding joint to the poor, or cable break; 6, the stator winding is damaged, or destroyed. Solution: 1. Check whether the start condition; 2, check whether the line is normal; 3, check the electrical circuit protection; 4, to eliminate blade stuck; 5, the motor lift inspection, maintenance; 6, the motor lift inspection, overhaul. Second, no water or less water reasons: 1, the impeller rotation direction reversed; 2, impeller or clogged sewage gate; 3, leaves office severely damaged; 4, due to the lower water level, impeller submerged deep enough. Solution: 1, check the wiring, and correctly connect the cable accessories; 2, to eliminate trash rack runner or foreign body; 3, by the manufacturer for repair; 4, check the installation meets the requirements of the company's reference manual. Third, less than the design flow reasons: 1, the impeller severe damage; 2, lower the water level of the impeller submerged deep enough; 3, outlet Road water loss is too large, increasing the total head. Solution: 1, by the manufacturer for repair; 2, check the installation meets the requirements of the reference specification on the Company; 3. Calculate the hydraulic loss + water outlet Road and is greater than the difference between the selection of the pump head; if big, Selection of a problem, need to re-selection. Fourth, the overload reasons: 1, the impeller and casing friction; 2, impeller has a blockage; 3, in the state outside of design head the design flow; 4, bearing or thrust bearing damage. Solution: 1, to eliminate friction impeller and housing; (2) the elimination of foreign body in turn leaves tract blockage; 3, to avoid running off-design conditions; 4, check the bearing damage and keep bearing intact. Fifth, the current increases reasons: 1, friction or contact with the impeller and the casing; 2, bearing parts, etc. bite foreign body; 3, poor bearing lubrication, or bearing damage; 4, to run in a state other than the design flow design head. Solution: 1, to eliminate friction or contact with the impeller and the casing; 2, remove foreign matter bite bearing parts, etc; 3, check bearing grease adequacy, good; 4, avoid running off-design conditions. Sixth, the motor inlet reasons: 1, with face seal is not good; 2, mechanical seal damage, mechanical seals do not work; 3, cable outlet of the seal is not good; 4, the control cable is disconnected; 5, the motor housing or motor cover and other pieces of water seepage. Solution: 1, check for loose fasteners, O-ring is good; 2, check the mechanical seal is damaged, such as failure to be replaced; 3, check the cable outlet of the seal is intact, tighten the bolts; 4, system cables are together with the main cable, and tighten the wellbore, such as control cables need to be connected to the fracture; 5, repair or replacement by the manufacturer. Seven of the stator burned reasons: 1, resulting in phase; 2, impeller stuck or loose; 3, electrical water; 4, winding circuit; 5, the valve is closed starting torque is too large to burn the stator. Solution: 1. Check whether the connected line; 2, to eliminate the impeller stuck; 3, check whether the motor is water; 4, check the winding open circuit, and repaired; 5, the valve must be fully open to start, you must burn the stator Repair or replace. Eight, unit vibration installation problems: 1, unit mounting failure; 2, loose fasteners; 3, impeller blocked or clogged sewage gate; 4 positioning pins are not in place; 5, the impeller and casing friction; 6, bearing damage; 7, since the blade is damaged or runner blockage adverse rotor balancing. Installation problems: 1. Check the pump unit installation meets the requirements; 2, solid fasteners; 3, eliminate impeller blocked or clogged sewage gate; 4, the positioning pins in place; 5, the elimination of the impeller and the casing friction; 6, check the bearing is normal, or replaced; 7, the impeller balance correction or replacement of the impeller. Nine, cavitation problems: 1, impeller submerged deep enough; 2, into the pool of shapes and sizes do not meet the requirements; 3, water condition is not good; 4, far less than the operational design flow conditions. Cavitation problem solving: 1, check the installation meets the requirements of the reference specification on the Company; 2, check into the pool of shapes and sizes to meet the requirements; 3, to improve water conditions, such as to remove silt and foreign matter; 4, to avoid much smaller than design conditions run (in the vicinity of the design point operation).