Screw pumps and rot or pumps are actually a lot of differences, but now there are still many people on the two of them can not distinguish, today Ace pump industry to explain the difference between screw pumps and lobe pumps.
The differences between screw pumps and lobe pumps are mainly as follows.
One of the differences between progressive cavity pumps and lobe pumps: self-priming capability
lobe pumps: very good self-priming capability at speed ratios above 200 rpm, allowing for short dry spins.
Single screw pumps: very good self-priming capability, but prevent the pump from running dry for more than thirty seconds.
One of the differences between progressive cavity pumps and lobe pumps: working pressure range
lobe pumps: 0-12 bar.
Progressive cavity pumps: multistage centrifugal pumps up to 48 bar.
One of the differences between progressive cavity pumps and lobe pumps: floor space
lobe pumps: because of their compact design, they require a small footprint and do not require additional space for maintenance, and their specifications can be adjusted to customer specifications.
Single screw pumps: the size varies according to the number of isometric stages, but because the extruder screw is long, a very large indoor space is necessary for maintenance, and there is only one pump flange specification for each model specification.
One of the differences between progressive cavity pumps and lobe pumps: transport orientation
lobe pumps: reversible transport orientation, pumps of thoroughly symmetrical construction.
Single screw pumps: they cannot be reversed and the seal is in a stressed situation in the case of transport in the opposite direction.
One of the differences between a progressive cavity pump and a lobe pump: dry turning
lobe pumps: low sensitivity to dry rotations, no high temperature rise in the pump casing at high speeds for long periods of time, seals operate in a grease soaked environment.
Single screw pumps: the rotor and motor stator have a transitional fit in the middle, the temperature of the pump casing rises considerably during dry rotation, the pump seal is not lubricated with grease and there is a risk of over-temperature.
One of the differences between progressive cavity pumps and lobe pumps: maintenance
lobe pumps: very easy, no need to disassemble and install piping, very few common tools, little room space, little human resources.
Single screw pumps: not easy, each maintenance must be dismantled and moved away from the pipeline, cross shaft, motor stator, rotor and other parts must be commonly used tools to dismantle, overhaul work must be a large indoor space to carry out, 2 people above the maintenance work can be carried out in.
One of the differences between progressive cavity pumps and lobe pumps: service life of spare parts
lobe pump: long, because there is no friction in the middle of the components, the lobe pump wear bad parts of the use of a long period, the key to the wear of the opposite flow components from with the material in the leaching and corrosion of the composition.
Single screw pump: low, rotor and motor stator in the middle of the friction, substances such as fine particles in addition to harm the use of bad parts, shaft force rotation of the rotor caused by the ground stress all by the motor stator to bear, that aggravates the components in the middle of the wear and tear, even if the transport does not have all the fine particles of the substance, the pump motor stator will slowly wear out.
One of the differences between progressive cavity pumps and lobe pumps: the cost of accessories
lobe pumps: very low, the lobe pump's patented adjustable rotor and removable rotor tip reduce the cost of accessories to a minimum, and the cost of removable jaw plates and seals is also extremely low, with the cost of spare parts accounting for only 10% to 15% of the entire pump.
Single screw pump: very high, because the screw pump manufacturers among the fierce price competition, prompted by the sale of the whole pump is not earning money, now the key to profitability of screw pump manufacturers from the market sales of spare parts, an extreme example is a set of spare parts price higher than the price of the whole pump.
Warm tip: The above is about the difference between screw pumps and lobe pumps what is the relevant introduction. After reading these compared to everyone is clear screw pump and lobe pump difference, if you still have what do not know, you can consult Ace pump industry, we will sincerely for your service.