Screw Pump

Screw pump operates with two counter-rotating screw rotors that are carefully designed to rotate “toward each other”. This traps the gas in the space between the rotor “screws”. As the screws rotate, this trapped volume is reduced, which not only compresses the gas, but also moves it toward the exhaust port.

When the progressive cavity pump begins to operate, power is supplied to the drive screw via an electric motor. The drive shaft is connected to the screwdriver that drives the screwdriver.

When the drive screw starts to rotate, the driven screws also rotate, as these screws engage each other. Due to the movement of these screws, a minimum vacuum starts to be generated in the inlet section. Due to this vacuum, fluid is drawn into the pump through the inlet valve.

As the fluid enters the pump, it becomes trapped between the gaps in the “screws”. This trapped fluid also moves with the rotation of the screw. As the screw moves, the volume of the trapped fluid decreases and the pressure of the fluid increases.

As the pressure of the fluid increases according to the desired pressure, it is discharged from the outlet valve and moved to the desired location.

When a screw pump pumps oil or other types of viscous fluids, the screw surfaces are lubricated as the fluid is pumped, so there is little or no clearance between the screws.

However, when pumping gas/water mixtures, water, or other types of light liquids, these components cannot come into contact with each other. If there is no contact, the parts will wear out quickly. Therefore, do not use a triple screw pump (where one screw drives the other two without gears) for water supply or multi-phase operation.

Driver Screw
It’s a screw pump’s spinning component. The driver screw connects to the motor’s driving shaft. It aids in the consistent volumetric flow rate of fluid pumping. The timing gear is connected to one end, while the drive shaft is connected to the other.

Driven Screw
High-tensile steel metal is also used for the driven screw. Because of the movement conveyed by the timing gear, it rotates around its axis. It spins in the opposite direction as the driver’s gear. The clearance area of this screw is constant. This aids in catching water inside the restricted space.

Timing Gear
The timing gear drives the driven screws in such a way that the female and male rotor assemblies do not make metal-to-metal contact. It establishes a link between the driver and driven screws. The driver screw rotates the timing gear, which then transmits that rotation to the driven screws. It drives screws in this manner. Even if the pump is turned off for a short time, it guarantees that no such connections are made.

Inlet & Outlet Ports
The intake and exit ports of a screw pump are distinct. The water is sucked into the pump through the intake port, and it is discharged through the output port. When the pump ultimately stops, the inlet and output are designed to ensure that there is enough liquid medium. This aids in the delivery of the pump’s initial liquid medium. As a result, the suction tube should not dry out quickly, even if it is empty or dry.

Pressure Relief Valve
Screw pumps are a type of positive displacement pump that builds pressure even while the outlet is closed. This builds up pressure, which can lead to major problems including pump internal part damage and harm to the pump operator. As a result, every positive displacement pump has a relief valve to safeguard the pump, the operator, and any associated gear. Extra pressure is returned to the intake using this valve. Recirculating the exit fluid is another well-known method of reducing extra pressure.

Bearings
During pump operation, the top bearings of a vertically mounted screw pump sustain heavy loads as well as axial and radial stresses. As a result, the load on the lower bearings is minimal.

Driving Shaft
The driving shaft links the pump assembly to the drive motor. This connection is made possible by the use of the proper set of flexible couplings.

Daily maintenance
Daily maintenance refers to the basic inspection and treatment before and after each use of the screw pump or every day, mainly including the following aspects:

● Check whether the power supply is normal, whether the motor is overloaded, and whether the steering is correct.

● Check whether the inlet and outlet valves are closed, whether the pipeline is unobstructed, and whether there is any leakage.

● Check whether the shaft seal is leaking, whether the packing or mechanical seal is worn, and whether it needs to be replaced or adjusted.

● Check the oil level, oil quality, and oil temperature of the lubricating oil, and whether it needs to be replenished or replaced.

● Check whether the cooling water, sealing oil, and lubrication system are working normally and whether there are defects such as leakage, leakage, etc.

● Check whether the coupling is aligned, loose, or damaged.

● Check whether the clearance of the synchronous gear is appropriate and whether there is wear or abnormal sound.

● Check whether the operating parameters of the screw pump, such as flow, pressure, temperature, vibration, etc., are within the normal range.

● Check whether safety valves, pressure gauges, and other accessories are intact and reliable and whether they are stuck or malfunctioning.

● After transporting rubber or sewage media, the remaining media in the pump chamber should be cleaned with clean water in time, and the accumulated fluid should be drained to avoid failures such as blockage, jamming, and difficulty in opening.

Regular maintenance
● Check the working conditions of the screw pump every day, observe whether there are abnormal sounds, vibrations, temperature rise, leakage, etc., and find and deal with problems in time.

● Check the lubricating oil of the screw pump every week, check the oil level, oil quality, oil temperature, and other indicators, and replace or supplement the lubricating oil as needed. The quality and quantity of lubricating oil directly affect the operating efficiency and life of the screw pump.

● Check the seals of the screw pump every month, such as shaft seals, packing, etc., check for wear, aging, deformation, etc., and replace or adjust the seals as needed. The state of the seal directly affects the sealing performance and safety of the screw pump.

● Check the bearings of the screw pump every quarter, such as rolling bearings, sliding bearings, etc., check for wear, damage, looseness, etc., and replace or adjust the bearings as needed. The state of the bearing directly affects the smooth rotation and noise level of the screw pump.

● Check the main parts of the screw pump every year, such as screw, casing, inlet, and outlet, etc., check for cracks, deformation, corrosion, etc., and replace or repair parts as needed. The state of the main components directly affects the delivery capacity and reliability of the screw pump.

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