For the conveying of high viscosity materials: in order to make the conveying smoother ---- the speed of the pump is appropriately selected low (according to the viscosity of the material to make the best choice). Secondly, after the pump speed down, the service life of the mechanical seal will be greatly extended. From the development of volumetric pumps, gear pumps have the longest history, and then gradually replaced by diaphragm pumps, screw pumps and eventually replaced by the current Rotary Lobe Pump. But in the lubricating oil, not high requirements of industrial products in the transmission pump gear pumps are still very wide range of use. If you are pursuing: long service life of the pump, less wearing parts, low failure rate, easy maintenance, high volumetric efficiency, the use of heart ----- preferred cam Rotary Lobe Pump. But the price of the pump will be higher than a part of the gear pump, depending on the actual working conditions of your company to decide. Comparison of various aspects are as follows:
|
Gear Pumps |
Diaphragm Pump |
Screw Pump |
Rotary Lobe Pump |
|
|
Pump body structure |
Transmission and conveying are realized in one pump chamber, the gears are easy to wear, and the wear generates gear gray foam which affects the quality of the product. |
Double membrane pneumatic feeding and discharging, small size |
A single screw, for example, is large and takes up a lot of space. |
Transmission principle in the gear box to realize the gear has lubricant protection, to ensure the long life of the gear, the principle of material transfer in the pump cavity to complete, and between the rotor, the rotor and the pump cavity does not contact, 0 wear and tear. |
|
Overcurrent components |
Cast iron, cast steel, stainless steel |
Caoutchouc |
Cast iron, cast steel, stainless steel |
Stainless Steels |
|
Output speed |
10-960r/min |
气电分输 |
10-960r/min |
10-400r/min |
|
Volumetric Efficiency |
70% |
65% |
70% |
80% |
|
Output Pressure |
0-50kg |
0-8kg |
0-16kg |
0-16kg |
|
transport pulsation |
Few |
Oldest |
Few |
Center |
|
Vulnerable accessories |
Transmission gears, mechanical seals |
membranous |
Stator, Seal |
Mechanical Seal |
|
Maintenance |
Hassles |
Go To The Toilet |
Hassles |
Simpler |
|
Service Life |
5-10year |
5-8year |
5-10year |
10-20year |
|
Pump Benefits |
inexpensive |
inexpensive |
inexpensive |
Slightly more expensive. |
To 10 cubic meters / hour, viscosity in 10000CP, motor power 7.5KW, material 304, pressure 8 kg, for example: high-end manufacturers prices were: gear pumps about 70,000, screw pumps about 18,000, Rotary Lobe Pump between 26,000-30,000. For reference only
