Horizontal Multistage Centrifugal Pump D Series

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Introduction of D Series Horizontal Multistage Pump

This series of pumps use national energy-saving hydraulic model, developed and updated constantly by our factory, with the advantage of high efficiency, wide range of performance, safety and smooth operation, low noise, easy installation and maintenance, long life, and its technology level is in the domestic leading position, product performance is reliable. 

 

Performance of D Series Horizontal Multistage Pump

Flow Range:3.7-840m3/h

Head Range:19-680m

Power Range:3-630KW

Temperature:-20ºC-105ºC

Material:Cast Iron,Stainless Steel

Work Pressure:≤1.6MPa

Features of D Series Horizontal Multistage Pump
1. This series pump is a horizontal, single suction, multi stage centrifugal pump section, the suction is in horizontal direction, and outlet is vertical upward. Water suction, middle, discharge section, bearing housing and pump body are bolted into one strain, and select stages according to the pump head. 
2. Rotor includes shaft, impeller, shaft sleeve, balance disk, and other parts. Axis parts are connected through the flat keys and the shaft nuts. The rotor is supported by the rotor bearings or sliding bearings in both ends, the bearing does not bear axial force, axial force is balanced by the balance disc. Bearings lubricated with grease, sliding bearings lubricated with light oil, and oil ring lubrication, and cooled by circulating water. 
3. Shaft seal in the form of two kinds, mechanical seals and packing seal. When use packing seal, the packing ring should be placed at the right location, the tightness of packing must be appropriate to the liquid oozing drop by drop. Various sealing elements is in a sealed chamber, the chamber must be filled with some water, as water seal, water cooled or water lubrication. At the seal there is replacable sleeve, to protect the shaft. 
4. From the motor direction, the pump is clockwise rotation.

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Q:The reason why the pump is overloaded
Main reasons: 1. bearing lubrication is not good or bearing quality problems appear peeling phenomenon, resulting in increased resistance to pump operation.2., the pump cover and impeller clearance is too small, the impeller mouth and pump cover friction.3 belt tight, resulting in heavier load.4. centrifugal pump power is proportional to the flow, the greater the flow, the greater the power needs, large, low head flow, resulting in heavy load.Water pump maintenance: 1., water pump to do routine maintenance, check the water seal every day, to prevent water damage, water directly into the bearings, accelerated wear and tear.2. belt adjustment should be appropriate, not too loose, too tight.3. strictly according to the standard operation, for the low lift pumping load, it is necessary to control the flow by throttling, thereby reducing the load.
Q:What is the water pump population pre rotation, what harm?
Is the entrance of water flow in the formation of complex turbulent flow, flow direction, shock, vibration, easy to damage the front entrance device, such as vane impeller, shaft sleeve, sealing element.
Q:Domestic pump does not use water, or turn, I do not know why?
The motor should be kept working, may be the motor switch problem, idling motor pump long time will certainly be bad, ha ha, the solution is to find a water pump maintenance master to work safety first!
Q:Water pump maximum flow and standard flow?
Centrifugal pump, flow and head is an inverse relationship between the maximum flow, you said, lift the corresponding conveying pump is relatively low, the standard flow, the rated flow is designed and run in standard flow, pump efficiency is the highest, if more than the standard flow operation possible lead pump overcurrent heating, and a series of cavitation phenomena
Q:Why does the GB/T3216 specify the pump performance tolerance as positive and negative?
Tolerance coefficient is due in the manufacturing process, will, so each pump products are possible shapes and sizes do not conform to the pattern of the situation, and ensure the test results in the value (operating point) when compared, should be allowed to have a certain tolerance. It should be noted that these tolerances are only relevant to the actual pump and do not involve test conditions and measurement uncertainties.If the pump at a certain working point (the same lift) standard (Design) flow of 20m3/h, the actual flow of 22m3/h, indicating that the pump in the design process has unreasonable place, resulting in waste of power. Deviations from the manufacturing process usually have no positive deviation.
Q:How many kinds of pumps are there? What are the advantages of soft start?
The starting modes of water pump are direct start, star triangle start, reactance start, soft start, step-down start and frequency conversion start.1, direct start, generally suitable for small power motors, generally only in the following 15kw pumps, cheap;2, the buck start is the star triangle conversion start, that is, the start is accelerated two times to reach the rated speed, generally in more than 18.5kw pump use, moderate price;3, soft start is gradually increased to the rated speed, the impact on the pump is very small, the price is relatively high, is generally 3 times the buck start;4, the highest frequency conversion is started, in addition to the advantages of soft start, but also can be set at any speed work, energy saving has significant effect.Advantages of soft start:1, the output torque of the motor can meet the requirements of the starting torque of the mechanical system, ensure smooth acceleration, smooth transition, and avoid the impact of destructive torque;2, the starting current to meet the requirements of the motor capacity, to avoid motor heating, causing insulation damage or burnout;3, make the starting current to meet the grid power quality related standards requirements, reduce voltage sag amplitude, reduce the higher harmonic content.
Q:Submersible pump reverse impact on the pump
Water pump is easy to burn out.Submersible pump is an important equipment for deep well water extraction. When in use, the whole unit dives into the water. The extraction of groundwater to the surface is water, mine rescue, industrial cooling, irrigation, water lifting, ship ballast, also can be used in fountain landscape, hot water submersible pump for hot spring bath, but also can be applied to the extraction of groundwater from wells, can also be used in rivers, reservoirs, canals and other water projects. Mainly used for irrigation and high mountain areas, drinking water, but also for the central air conditioning cooling, heat pump, cooling pump unit, city, factories, mines, railways, construction site drainage use. The general flow can be achieved (5m per hour, fand fand ~650m) head can reach 10-550 meters.There are several kinds of electric submersible pump, in line package is oil immersed and water invasion there is dry must first read the instructions before use, cannot be wrong, not long before use, must have to make the impeller turn, or because of long time card dead burning.Before the pump is opened, the suction pipe and pump must be filled with liquid. Open the pump, the impeller rotating speed, which leaves the liquid together with the rotation under the action of centrifugal force, the left outside impeller injection, injection of the liquid in the pump shell gradually slow the spread of indoor speed, the pressure gradually increased, and then from the pump outlet, the outflow discharge tube.At this time, in the leaves at the center of the vacuum area of low pressure liquid was thrown to the surrounding formation there is no air and no liquid, liquid pool at the surface of the liquid under the action of atmospheric pressure, through the suction pipe into the pump, the liquid is continuously pumped up from the liquid pool is also continuously from the outflow discharge tube.
Q:Can the water from the fire pump enter the roof fire tank? Why?
Fire water pump water can not enter the roof, fire water tanks, "construction regulations" and "high regulations" clearly defined. The roof fire water tank acts as a temporary fire fighting water for 10 minutes, and the water in the fire pump is supplied directly to the indoor hydrant or sprinkler system. Roof water tank fire water can only be provided by the living pump.
Q:90kw pump star delta start, in the end to use the circuit breaker, AC contactor (Star contactor, angle contactor), what kind of thermal relay?
The first thing to take the star delta start voltage step-down start, star rated by reducing root 3 times, power is also reduced, 90kw / V 3 = 52kw starting current is 5---7 times will reach the rated current of 52kw * 2 = 104A, starting current will reach 500----700A is normal, if you match breaker sister ordinary 800, D at the beginning of the special motor, they start filtering instantaneous current, 250 can be,The star delta starts with only three contactors, and there will be no 4The contactor can be more than 110
Q:2 pumps parallel, lift the same, pump head is not stacked?
2 pumps parallel, lift the same, pump head is not stacked?;Answer: the head can not be superimposed, that is, a lift and a pump, but the pumping speed (flow) is two times a taiwan.2 pumps in series, the same flow, pump head is not stacked?.Answer: the head can be superimposed, that is, the pump head is two times as much as a pump, but the pump speed is the same as that of a pump.

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