German SAUER DANFOSS pump, SAUER DANFOSS model, SAUER DANFOSS price

SAUER DANFOSS pumps are also known as positive displacement devices. Like a piston in a cylinder, when one gear tooth enters the fluid space of another, the liquid and the tooth cannot occupy the same space simultaneously because liquids are incompressible. Thus, the liquid is mechanically squeezed out. Due to the continuous meshing of the teeth, this phenomenon occurs continuously, providing a continuous discharge volume at the pump outlet. The discharged volume is the same for each revolution of the pump. As the drive shaft rotates continuously, the pump discharges fluid without interruption. The pump flow rate is directly related to the pump speed.

SAUER DANFOSS pump structural features

1) Simple structure, low price; 2) Low operational requirements, wide application; 3) The end covers and the slots between the gear teeth form many fixed sealed working chambers, so it can only be used as a positive displacement pump. The gears adopt advanced technology from the international level of the nineteen-nineties -- double circular arc sine curve tooth profile. Compared with involute gears, the most prominent advantage is that there is no relative sliding on the tooth flank surface during gear meshing, so there is no wear on the tooth flanks, smooth operation, no fluid trapping phenomenon, low noise, long service life, and high efficiency. This pump breaks free from the constraints of traditional design, bringing gear pumps into a new realm in terms of design, production, and use. The pump is equipped with a differential pressure safety valve for overload protection, and the full return pressure of the safety valve is 1.5 times the rated discharge pressure of the pump. It can also be adjusted according to actual needs within the allowable discharge pressure range. However, this safety valve cannot be used as a pressure reducing valve for long-term operation; a pressure reducing valve can be installed separately if needed. The shaft end seal of this pump is designed in two forms: one is mechanical seal, the other is packing seal, which can be determined based on specific operating conditions and user requirements.

SAUER DANFOSS pump drive unit

The gear pump is driven by an independent motor, which can effectively block upstream pressure pulsations and flow fluctuations. The pressure pulsation at the gear pump outlet can be controlled within 1%. Using a gear pump on an extrusion production line can increase the flow output speed and reduce the shear and residence time of materials in the extruder. External meshing gear pumps are the most widely used type of gear pump; generally, the term 'gear pump' refers to external meshing gear pumps. Its structure is shown in Figure 5-14, mainly consisting of a driving gear, a driven gear, a pump body, a pump cover, and a safety valve. The sealed space formed by the pump body, pump cover, and gears is the working chamber of the gear pump. The shafts of the two gears are installed in the bearing holes on the two pump covers respectively. The driving gear shaft extends out of the pump body and is rotated by the motor. External meshing gear pumps have a simple structure, light weight, low cost, reliable operation, and wide application range. When the gear pump is working, the driving gear rotates with the motor and drives the driven gear to rotate. When the meshing teeth on the suction side gradually separate, the volume of the suction chamber increases, the pressure decreases, and the liquid in the suction pipe is drawn into the pump. The sucked liquid is pushed by the gears in the tooth slots along two paths into the discharge chamber. After the liquid enters the discharge chamber, due to the continuous meshing of the teeth of the two gears, the liquid is squeezed and enters the discharge pipe from the discharge chamber. As the driving gear and the driven gear rotate continuously, the pump can continuously suck in and discharge liquid. A safety valve is installed on the pump body. When the discharge pressure exceeds the specified pressure, the conveyed liquid can automatically push open the safety valve, allowing the high-pressure liquid to return to the suction pipe. Internal meshing gear pumps consist of a pair of mutually meshing internal gears, a crescent-shaped piece between them, and a pump shell. The function of the crescent-shaped piece is to separate the suction chamber from the discharge chamber. When the driving gear rotates, a partial vacuum is formed where the gears disengage, and the liquid is sucked into the pump, filling the spaces between the teeth in the suction chamber. Then it enters the discharge chamber along the inner and outer sides of the crescent-shaped piece via two paths. Where the teeth enter meshing, the liquid existing between the teeth is squeezed and sent into the discharge pipe. In addition to having self-priming capability and flow rate independent of discharge pressure, gear pumps have no suction or discharge valves on the pump shell, featuring simple structure, uniform flow, and reliable operation. However, they have low efficiency, high noise and vibration, and are prone to wear. They are mainly used to transport various oils that are non-corrosive, free of solid particles, and have lubricating properties, such as lubricating oil and edible vegetable oil. The temperature generally does not exceed 70 ℃. The general flow range is 0.045～30ms/h, the pressure range is 0.7—20MPa, and the operating speed is 1200—4000r/min.

SAUER DANFOSS pump troubleshooting

1) Fault phenomenon: Pump fails to discharge material. Cause of fault: a, reverse rotation direction; b, suction or discharge valve closed; c, no material at inlet or pressure too low; d, viscosity too high, pump cannot bite material. Countermeasure: a, confirm rotation direction; b, confirm whether valves are closed; c, check valves and pressure gauge; d, check liquid viscosity to see if flow appears proportional to speed at low speed; if there is flow, the inflow is insufficient. 2) Fault phenomenon: Insufficient pump flow. Cause of fault: a, suction or discharge valve closed; b, low inlet pressure; c, blocked outlet pipeline; d, packing box leakage; e, speed too low. Countermeasure: a, confirm whether valves are closed; b, check whether valves are open; c, confirm whether discharge volume is normal; d, tighten; if massive leakage affects production, stop operation and dismantle for inspection; e, check the actual speed of the pump shaft. 3) Fault phenomenon: Abnormal noise. Cause of fault: a, large coupling eccentricity or poor lubrication; b, motor failure; c, gearbox abnormality; d, improper installation at shaft seal; e, shaft deformation or wear. Countermeasure: a, align or fill with lubricating grease; b, check motor; c, check bearings and gears; d, check shaft seal; e, stop and dismantle for inspection. 4) Fault phenomenon: Excessive current. Cause of fault: a, excessive outlet pressure; b, melt viscosity too high; c, improper assembly of shaft seal; d, shaft or bearing wear; e, motor failure. Countermeasure: a, check downstream equipment and pipelines; b, test viscosity; c, check shaft seal and adjust appropriately; d, check after stopping; manually turn the shaft to see if it is too heavy; e, check motor. 5) Fault phenomenon: Pump stops suddenly. Cause of fault: a, power outage; b, motor overload protection; c, coupling damage; d, excessive outlet pressure, interlock response; e, abnormal biting inside the pump; f, shaft and bearing adhesion/seizure. Countermeasure: a, check power supply; b, check motor; c, open safety cover and check by turning shaft; d, check instrument interlock system; e, after stopping, confirm by turning shaft in forward and reverse directions; f, confirm by turning shaft. 6) Fault phenomenon: Seal oil leakage. Cause: a, shaft seal not adjusted properly; b, sealing ring worn causing large clearance; c, dynamic and static ring friction surfaces of mechanical seal damaged; d, spring relaxation. Countermeasure: a, readjust; b, tighten gland bolts appropriately or replace sealing ring; c, replace dynamic and static rings or regrind; d, replace spring.

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