[Asia Pump Network News] G-type single-screw pump in China in the 1950s have been produced in recent years G-type single-screw pump technology and its application developed rapidly. G-type single-screw pump is a positive displacement pump, from the structure points: single screw pump, twin screw pump, three screw pump and marine screw pump. Among them, the twin-screw pump and the three-screw pump are typical industrial pumps. The screw pump described herein refers to both types of pumps. The working principle of the two are basically the same, the use of occasions similar, the difference is that the viscosity of the medium transported by the twin screw pump wider range, and is suitable for non-Newtonian fluid delivery. The total efficiency of the two is not much difference, but the twin screw pump volume rate slightly lower than the three screw pump. G-type single-screw pump application analysis G-type single-screw pump in the furnace combustion system At present, some small and medium-sized steel mills and other metallurgical plants in the absence of gaseous fuel (such as gas) conditions, is still using liquid fuel. The most widely used liquid fuel is heavy oil. For example, heating furnace combustion system in the heavy oil delivery and fuel injection process, select the appropriate pump unit on the normal operation of the stove is very important. Due to the normal working viscosity of heavy oil are generally higher (80 ℃ at 50 × 102-6m2 / s or more), and with the temperature changes, the viscosity changes relatively large. This requires us to choose the right pump to accommodate the delivery of these media so they run stably and trouble-free. In particular, heavy fuel injection, pumping unit constant pressure is very important. According to the survey found that the current use of external gear pump (gear pump) users are still many. In fact, these systems have more advantages if using G-type single-screw pump. G-type single-screw pump can work without pulsation G-type single-screw pump work, through the screw rotor and pump sleeve hole wall between the formation of a sealed chamber, smooth delivery of low-pressure zone to the high-pressure zone, the entire transport process , The media for purely axial movement, can be completely pulse-free delivery of media. This is different from gear pumps. Gear pump work, the gear rotation, the media for axial and radial and composite direction of movement, resulting in significant mixing. The output pressure of its manifestations: G-type single-screw pump output pressure is relatively stable, the gear pump outlet pressure fluctuations. This is more noticeable when transporting high viscosity media such as heavy oil. Now in the field using the same specifications of the G-type single-screw pump and gear pump in the same conditions and at the delivery outlet pressure of 1 MPa when a simple comparison of the measurement of such two sets of data: When the delivery of heavy oil viscosity of about Is 75 × 102-6m2 / s, gear pump outlet pressure gauge pointer runout amplitude of ± 0.16, three screw pump outlet pressure gauge pointer runout amplitude of ± 0.05, twin screw pump outlet pressure gauge pointer runout range of ± 0.04. When the viscosity of heavy oil was about 150 × 102-6m2 / s, the pointer runout of gear pump outlet pressure gauge was ± 0.22. The pointer runout of triple screw pump pressure gauge was ± 0.06. Double G type single Screw pump outlet pressure gauge pointer runout amplitude of ± 0.04. This shows that, G-type single screw pump in the heavy oil delivery and fuel injection process, the medium delivery pressure is very stable. And with the increase of medium viscosity, the characteristics of pulsation of G-type single-screw pump (especially twin-screw pump) are more obvious compared to the other. The Service Life of Type G Single-Screw Pumps Whether it is a screw or a gear pump, the wear of the teeth is the most important factor in determining its life. Because the tooth wear will lead to a significant decline in flow, reduce efficiency. In the long-term survey found that the gear pump in the heavy oil delivery and combustion system for continuous operation of the service life of about 3 to 6 months, while the G-type single-screw pump life are basically more than 1 year. After examination and consultation with the relevant pump manufacturers on the production process, and conducted a number of comparisons, the basic exclusion of the rotor due to the material and its heat treatment causes the existence of the above differences. The main reason is that in addition to the above-mentioned G-type single-screw pump can work smoothly without pulsation, but also in the G-type single-screw pump is not sensitive to changes in the viscosity of the medium, but with the operation of mechanical vibration caused by small internal Mechanical loss and other factors are directly related. At the same time, the use of gear pumps and G-type single-screw pumps in the heavy oil transportation and fuel injection system of a steel pipe plant was counted. The operating conditions were continuous working system. The average service life of the gear pump for 1999 was 4 months, and the average service life for 2000 was 4.5 months. In 2001 after the switch to the G-type single screw pump, two years in addition to a sealed seal to replace the seal, there has been no significant wear out of the tooth-worn problems. G-type single-screw pump for the main rolling mill lubrication system in the rolling mill, the main rolling mill gear box lubrication system is stable and reliable operation of the entire rolling production process. In the past many factories are using gear pumps, G-type single-screw pump in the past two years to start more. Because the use of G-type single-screw pump lubrication system has the following advantages: (1) The correct use of G-type single screw pump unit with small vibration, low noise level characteristics. Pumps produce vibration and noise of many factors, in the same conditions, G-type single screw pump unit and gear pump unit, the vibration and noise level lower. For example, the vibration speed sensor is used to test the vibration of the unit. The test conditions are exactly the same. The test medium of 9 × 102-6m2 / s is hydraulic oil, the displacement of the pump is 67mL / r, the rotation speed of the screw and the gear rotor is determined G-type single-screw pump and gear pump vibration situation. Similarly, noise levels were measured separately for noise level. (2) G-type single screw pump can do a longer working hours will not aggravate the transmission medium emulsification. Hydraulic system of the anti-emulsifying properties of the working medium have strict requirements, the use of gear pump due to the working medium will be stirred, the oil in the water easily form an emulsion with oil, the oil easy to produce sediments and reduce oil lubrication. G-type single-screw pump media to do purely axial movement, smooth, no pulsation, the media will not stir, which will not aggravate the working medium for a long time the emulsion. (Editor: Li Juan QQ:) Recommended reading: Acting procurement
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