Selection of double-suction and single-suction twin-screw pumps
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1. Asphalt delivery pump: There are two types: 400 cubic meters and 120 cubic meters. It is certain to choose double suction for 400 cubic meters. Is it necessary to choose double suction for 120 cubic meters? 2. Coking material delivery pump: It is the same as the asphalt delivery pump, except that the viscosity and temperature are slightly different, but not too big. For double suction, 4 sets of mechanical seals are used, but the later maintenance costs are higher. ； Single suction only uses one set of mechanical seals, but improper use may cause the screw to lock. ； Gather together, everyone brainstorms and discusses.
Are you talking about single screw pumps and twin screw pumps? Twin-screw pumps are double-suction and have 4 sets of mechanical seals. Single-screw pumps are single-suction and have 1 set of mechanical seals.
Piggy, what you said is wrong. Twin-screw pumps are divided into double-suction and single-suction. I have confirmed this with the manufacturer. Single-suction twin-screw pumps without synchronization gears will cause the screw to lock.
This post was last written by lxn_663 on 2010-5-4 12:02 Editor I just asked the twin-screw pump manufacturers. They only have different changes in the rotor for single-suction and double-suction. Maybe the structure of each manufacturer's pump is different. I will help you push the post up and let experts discuss it.
Twin-screw pumps are all driven by synchronous gears. The two screw sleeves are not in contact and will not lock up. In addition, the poster asked whether single suction or double suction should be used according to the working conditions. The characteristic of double suction is that the flow rate is larger. The specific situation will be analyzed in detail and the manufacturer can provide specific working conditions for selection.
Both pumps can be used, but since your medium is asphalt and the viscosity of the medium is relatively high, 120 Square recommends using a double-suction twin-screw pump. In this way, the axial force can be completely balanced. The pump adopts an external bearing configuration to form an independent sealing chamber to ensure good lubrication of the mechanical seal, bearings, and synchronization gears and extend the service life. In terms of purchasing, it is true that double-suction is not as economical as others, but it is not much higher. In terms of maintenance, from my statistics, the maintenance costs of the two pumps are almost the same. Under the same pressure, flow rate, and medium, the cost of double-suction is lower (of course, this includes losses due to equipment failure) Let’s talk about domestic manufacturers. Currently, there are so many domestically produced twin-screw pumps that have the internal strength to do well.: Tianjin General Factory, Nanjing Industrial Pump Factory, Huangshan, Xinde and other factories, Tianjin and Nanjing factories participated in formulating the standards for screw pumps. * * There is no doubt about the standard after-sales service and quality. The other two companies have also developed rapidly in the past two years! A few comments are for reference only
I forgot to clarify, the similarities and differences between single suction and double suction. To put it figuratively, single suction is one in and one out, and double suction is two in and one out. Don’t get confused.
Who said that twin-screw pumps must have synchronized gears? Some twin-screw pumps drive one to drive the other. This kind of twin-screw pump only needs one set of mechanical seals. The one with synchronized gears must have four sets of seals. Also, the double-suction twin-screw pump does not increase the flow, but balances the axial force.