1. Viscous liquid rotor pump can transport medium viscosity range is very wide, it can handle very low viscosity media, such as liquefied petroleum gas, liquid ammonia, but also can handle very viscous medium, such as viscosity of l000000mm2 / s special viscous medium . Centrifugal pumps, with the increase of viscosity, the flow, lift down, power consumption increases. When the medium viscosity is greater than 20mm2 / s, centrifugal pumps need performance conversion. When NPSH, far less than NPSH. Centrifugal pumps can sometimes be used for viscosities of up to 550 mm2 / s, regardless of efficiency and energy consumption; for NPSH, closer to NPSH. Centrifugal pumps will rarely cavitate if viscosity is high. For the rotor pump, on the one hand, with the increase of the viscosity, the internal leakage decreases, the volumetric efficiency increases, the flow rate increases, so that the efficiency of the pump increases, reducing power consumption; the other hand, the viscosity increase will make the liquid frictional resistance Increase, the corresponding will reduce the pump efficiency, power consumption increased slightly. Overall, however, the efficiency of the rotor pump increases as viscosity increases. Such as Q-5m3 / h, head H = 60m, density lD-1000k9 / cm3, compare centrifugal pump and gear pump shaft power. When the viscosity yl = 50mm2 / s, centrifugal pump shaft power is about 4.2kW, gear pump shaft power is about l.0kW. When the viscosity), 2-500mm2 / s, centrifugal pump shaft power is about 50kW, while the gear pump shaft power is still about l.OkW. Non-Newtonian liquids, such as oils and fats, cellulosic mixtures, paints, starch pastes, slurries and sugars, will change in viscosity as the liquid is disturbed at a constant temperature. If you use the centrifugal pump, when the viscosity becomes larger, the flow, lift can not meet the need, the motor overload. Therefore, when the medium viscosity or non-Newton-liquid delivery, the rotor pump should be used. 2. Need self-priming, self-priming pump occasions In addition to specially designed self-priming centrifugal pump, the general centrifugal pump does not self-priming function. But the rotor pump has a self-priming function, in its rotor wet (refers to not completely submerged or filled), can form a vacuum of 635 ~ 710mmH9, so as to inhale the liquid. 3. Centrifugal pumps that contain gases are generally not allowed to contain more than 5% gas in the liquid. When the gas content is large, corrosion, corrosion and corrosion may occur except for the flow, lift and efficiency. , Broken axis phenomenon. Rotor pump due to self-priming function, allowing the gas content in the liquid larger, generally up to about 20%. When the gas content is large, the flow rate, efficiency will decline, and will produce vibration and noise. But generally does not appear to exacerbate corrosion or broken, broken axis phenomenon. 4. Small flow, high pressure occasions flow is small, the outlet pressure is high, if you can not choose a suitable centrifugal pump, consider the choice of rotor pump. Rotor pump outlet pressure is high. Series production of the rotor pump, the outlet pressure up to 1-4 ~ 2.1MPa (G), some special models up to 3.5 ~ 7MPa (G). Special design of the rotor pump, the outlet pressure even up to l4 ~ 21MPa (G). 5. Low Shear Pumps Some shear-sensitive media and media that do not destroys suspended solids or solids in the solution when it is desired to pump require that the selected pump operate with very gentle impact on the media. At this time you can use low shear rotor pump, such as the cam pump, single screw pump. 6. Need to reverse the pump some of the production plant, the liquid from a period of time to be delivered to the Department B, at another time the liquid from the Department B to be delivered to a Department; and some other production facilities, import pipe easily blocked, Need to recoil. This often requires the pump to have a reverse function. Centrifugal pumps can not be reversed, and many rotor pumps have a reverse function. Of course, in order to meet the pump reversal, the motor, piping (including valves), etc. must consider a series of problems caused by pump reversal. Such as safety valve, not only the export pipeline should be set, and the import pipeline should also be set.
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Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
While the focus of residential lighting is often on aesthetics, commercial lighting is task orientated. Commercial lighting systems are designed based on what the application is. For example, in an office-type setting, you may see task lighting, which illuminates specific areas where employees need concentrated light to be able to perform their jobs.
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