The advantages and disadvantages of the 3QGB screw pump are as follows:
Advantages:
Simple structure: It is composed of main components such as screws and pump casings, without complicated valves and transmission devices. This reduces the probability of malfunctions and is also convenient for installation, disassembly, and maintenance.
Small size: Under the same requirements for flow rate and pressure, compared with other types of pumps, the 3QGB screw pump occupies a smaller floor area, can save installation space, and is suitable for workplaces with limited space.
Smooth and reliable operation: It transports media by using the screw meshing principle. There is no pulsation or agitation during the operation process, and the pressure pulsation is small. It can provide a stable pressure for the system, making the entire transportation system operate more smoothly and reducing the impact on pipelines and other equipment.
Allows high rotational speed: It can operate at a relatively high rotational speed, which to some extent improves the transportation efficiency and can meet the demand for large-flow transportation.
Stable flow rate: As long as the rotational speed is stable, its transportation flow rate can remain stable, unaffected by factors such as the viscosity and temperature of the medium. It can precisely control the transportation volume and is suitable for technological processes with strict requirements for flow rate.
Low noise: It generates relatively low noise during operation and usually does not cause obvious noise pollution to the working environment and operators, which is beneficial for improving the working environment.
Good sealing performance: It adopts mechanical seals. According to different media, different materials can be selected for the friction parts of the mechanical seals. For high-viscosity media, cemented carbide materials with good mechanical properties are selected, which can effectively prevent media leakage and meet the sealing performance requirements under high temperatures.
Wide range of transported media: It is suitable for transporting various non-corrosive oils and oil-like liquids, such as fuel oil, lubricating oil, hydraulic oil, heavy oil, asphalt, etc. It can also transport media containing certain particles or fibers. The particle diameter can reach 30 mm, and the fiber length can reach 350 mm.
Disadvantages:
High requirement for medium cleanliness: The clearance between the screw and the pump casing is relatively small. If the medium contains excessive impurities, particles or fibers, it is easy to cause wear on the screw and the pump casing, affecting the normal operation and service life of the pump. Therefore, it is necessary to install filtering devices such as filters at the inlet of the pump.
Not suitable for transporting corrosive media: It is generally made of cast steel and has poor tolerance for strongly corrosive media. If corrosive liquids are transported, it may lead to corrosion damage to components such as the pump body and the screw, and special materials need to be selected or anti-corrosion treatments need to be carried out.
High requirements for machining and assembly precision: As the core component of the screw pump, the screw rotor has the characteristics of a complex profile and high precision requirements. The machining and assembly precision is the key to affecting the volumetric efficiency and service life of the screw pump. If the machining and assembly precision is insufficient, it may lead to problems such as poor screw meshing, excessive or insufficient clearance, etc., thus affecting the performance and service life of the pump.
Axial force exists: During the operation process, the screw will be subjected to a certain axial force. Effective axial force balancing measures need to be taken. Otherwise, it may lead to problems such as increased wear of the screw and increased bearing load, affecting the reliability and service life of the pump.
High maintenance cost: Once key components of the screw pump, such as the screw and the pump casing, are worn or damaged, the maintenance cost is relatively high. Because these components have high requirements for machining precision, professional technicians and equipment are needed for installation and debugging during replacement.
