Rotary Lobe Pump is a form of positive displacement pump. It is composed of rotating rotor and static pump body, it has no suction and discharge valves, through the relative motion between the rotor and the pump body to change the working volume, and through the rotating rotor squeezing action to discharge the liquid, while on the other side of the space left, the formation of low-pressure, so that the liquid is continuously sucked in.
Difference between Rotary Lobe Pump and centrifugal pumps
1、Rotary Lobe Pump has strong self-priming ability, while centrifugal pumps must be filled with liquid before moving.
2、Rotary Lobe Pump is a volumetric pump, conveying flow can be more accurate control, can also be easily made into a variable pump. The output flow of centrifugal pumps can not be controlled, with the increase in their own resistance and decline.
3, Rotary Lobe Pump can be easily made into a higher output pressure varieties, such as 15kg/cm2, suitable for long-distance or high-resistance quantitative transportation.
4、 Rotary Lobe Pump speed is very low, generally between 120rmp to 600rmp, the material to be conveyed by the smooth output and its composition will not be damaged. The centrifugal pump's rotational speed is very high, the material being conveyed is subjected to strong impact and centrifugal force, so the centrifugal pump often produces the phenomenon of different material composition when conveying mixtures, so that the quality of the finished product decreases. The Rotary Lobe Pump is the best choice to solve this problem, so it is especially suitable for conveying mixed materials and even materials containing solid particles.
5、 Rotary Lobe Pump optimized rotor profile design, smooth pulsation, very small error, very small vibration, high efficiency, which is also the biggest difference between it and centrifugal pump.
6、The Rotary Lobe Pump can be used to transport the material with high viscosity, so it is also called colloid pump. And centrifugal pumps do not have this characteristic.
Difference between Rotary Lobe Pump and progressive cavity pumps
1、Rotary Lobe Pump can run dry, especially important in the sudden material breakage or operational errors, preventing damage to the pump to ensure safe operation.
2、The Rotary Lobe Pump is small in size, one-third of the installation area of the progressive cavity pump, which reduces the floor space and cost.
3、The Rotary Lobe Pump can realize convenient maintenance without disassembling the pipeline, which is convenient and flexible and reduces the downtime.
4、The non-extrusion working principle of Rotary Lobe Pump and the adjustable design of casing prolong the service life, reduce the number of maintenance and save the cost of spare parts.
Differences between Rotary Lobe Pump and high temperature magnetic pumps
1、Working Principle
Rotary Lobe Pump: Rotary Lobe Pump is a volumetric pump, driven by synchronized gears mounted on the two shafts of the two rotors rotating against each other. Between the rotor and the pump casing to form a small sealed cavity, the rotor in the rotation of the inlet end of the air is discharged to form a vacuum, the material is sucked in, filled with material in the cavity is constantly rotating rotor from the inlet end to the outlet end of the push, so as to realize the continuous operation of the pump.
High-temperature magnetic pump: mainly composed of pump head, magnetic actuator (magnetic cylinder), motor, connecting base plate and other parts, theoretically belongs to a centrifugal pump. Magnetic pump magnetic drive consists of outer magnetic rotor, inner magnetic rotor and non-conductive isolation sleeve. When the motor drives the outer magnetic rotor to rotate, the magnetic field can penetrate the air gap and non-magnetic material, and drive the inner magnetic rotor connected with the impeller to rotate synchronously, so as to realize the contactless synchronous transmission of power, and to transform the movable sealing structure which is easy to be leaked into the static sealing structure which has zero leakage.
2、Scope of application
Rotary Lobe Pump: Rotary Lobe Pump can be selected according to the material of the rotor material, the pressure can reach 8bar, the temperature does not exceed 200 ℃, can be transported viscous, containing solid particles of impurities, a wide range of applications.
High-temperature magnetic pump: conveying pressure is not greater than 1.6MPa, temperature does not exceed 350 ℃, viscosity is not greater than 30 * 10-6m2 / s, does not contain hard particles and fibers of the liquid.
3、Advantages
Rotary Lobe Pump in the impurity-containing media transport more advantages, can realize the gas-liquid-solid mixing, do not need to diversion irrigation pump.
The price of high temperature magnetic pump is relatively low, and the advantages are obvious in the workplace with high requirements for pump sealing.
Difference between Rotary Lobe Pump and gear pumps
1、 volume: Rotary Lobe Pump due to the compact design, the required footprint is small. No additional site is needed for overhauling the pump. Standard flange, caliber can be adjusted according to customer requirements. Gear pump, the overall structure is compact, small volume.
2、conveying direction: Rotary Lobe Pump conveying direction can be reversed, the pump is completely symmetrical structure. Gear pump conveying direction can not be reversed, the unloading tank is set according to the oil inlet and outlet, the position is not symmetrical.
3、 dry: Rotary Lobe Pump dry low sensitivity, a longer period of idling pump body temperature will not rise very high, mechanical seals in the lubricating oil immersion operation. Gear pumps basically a little dry rotation will burn the equipment.
4、maintenance: Rotary Lobe Pump maintenance is very easy, no need to disassemble the pipeline, very few special tools, very small space, very small manpower, no need for professionals. Gear pumps are not easy to disassemble the pipeline, motor.
Difference between Rotary Lobe Pump and long shaft submerged pumps
1、Self-priming ability
The Rotary Lobe Pump can be allowed to run dry and can reach a maximum vertical self-priming capacity of 8.7 meters; long-shaft submerged pumps can not be self-priming.
2、Forward and reverse ability
The conveying direction of the Rotary Lobe Pump can be reversed, is a completely symmetrical structure, the train trestle loading and unloading process is suitable for the use of Rotary Lobe Pump; long-shaft submerged pumps can not.
3、Coverage area
The Rotary Lobe Pump occupies a small area, adopts standard flange, and the caliber can be changed according to customers' requirements.
4、Maintenance
The Rotary Lobe Pump does not need to dismantle the pipeline, motor, single person using special tools, open the pump cover to complete the maintenance, convenient and simple; long-shaft submerged pumps need other auxiliary equipment lifted from the pool, the pump will be disassembled to complete the maintenance work.
5、Maintenance cost
Rotary Lobe Pump parts cost is 10% of the whole pump, a single person to complete the maintenance work, does not require a specific maintenance space. Long shaft submerged pump accessories cost far more than the price of the pump itself, the need for more people to cooperate to complete the maintenance work, high cost.
Differences between Rotary Lobe Pump and reciprocating pumps
Rotary Lobe Pump are assembled with the coupling as a whole, which reduces the power consumption of flexible coupling, noise and wear and tear replacement and improves the working efficiency, obtaining the highest efficiency, minimum internal sliding and longer service life. Rotary Lobe Pump have a high pressure head, flow rate is usually small, uniform discharge, can be transported medium viscosity of 100,000 cp, and solid content of up to 60% of the slurry.
Reciprocating pump is the use of piston reciprocating motion to transport liquid pump, by the reciprocating motion of the piston will be energy directly in the form of static pressure energy transfer liquid. Since the liquid is incompressible, when the piston presses the liquid, the liquid can be subjected to very high pressure, thus obtaining a high head.
Difference between Rotary Lobe Pump and submersible pumps
The mobile pumping station of Rotary Lobe Pump type is mainly composed of machine pump gate valve, pipeline and vehicle body. Among them, the machine pump is installed on the vehicle body by direct connection, which has good stability. When in use, the mobile pumping station is firstly moved to the place of use by the tractor, and then install the pipeline, which can be carried out.
When the submersible pump is applied to the mobile pumping station, due to the lack of any civil engineering in the early stage, the conditions of installation are poor, so most of them are installed by tilting. Inclined installation is to first connect the submersible pump with the outlet pipe and then slide it into the water along the chute frame, and carry out the corresponding cable fixing as well as the connection with the power line.
