First, the characteristics: Three screw pump is a positive displacement pump, due to the active screw and driven screw on the spiral groove intermeshing and their inner surface with the three bushing with the pump to be formed between the import and export of several dynamic seal The chambers, which will move the fluid axially from the pump inlet to the pump outlet and step up the fluid under pressure, create a continuous, steady, axially moving pressure fluid. Second, the scope of application of media and performance: Three screw pump fluid is a variety of non-solid particles, non-corrosive oils and similar lubricants, liquid viscosity of 1.2 ~ 100 ° E (3.0 ~ 760cst) High-viscosity liquid can also be transported by viscosity reduction after heating. Flow range of 0.2 ~ 590m3 / h, the maximum working pressure of 100bar, the maximum temperature of 150 ℃. Third, the structure: 1, the structure is simple: a variety of structural forms, the general small flow 0.2 ~ 6.5m3 / h pump body and bushing into one (collectively, pump body), shaft seal for the mechanical seal. Medium flow pump bushing above is a separate part fixed in the pump body, large flow pump made of double suction structure horizontal installation, the shaft seal according to the different transmission media have mechanical seal and packing seal two. 2, Long service life: The active screw of the three screw pump is driven by the motor. There is no mechanical contact between the main rod and the rod, and the pressure liquid is driven to rotate from the rod around the axis. The main rod, the rod, the screw rod and the liner There is a layer of oil film between the protection, so pump mechanical friction minimal life expectancy semi-permanent. 3, the infusion of liquid in the pump for axial uniform linear motion, so the pressure pulsation is small, stable flow, low noise, due to small rotating inertia, the starting torque and vibration is small. 4, with high suction capacity. 5, in order to ensure the safety of pumps, motors and piping systems, medium-volume screw pumps are equipped with safety valve above the pressure when the pressure exceeds the set pressure relief valve, high-pressure oil will return to the pump inlet. Three-screw pumps can be used in different industries, where they can play an important role and performance in the industry can fully demonstrate the good performance advantages in the industrial performance play an important role and contribution. The following characteristics from the trapped oil and measures such as imbalance to tell you about the three screw pump .1 Features: 1) three screw pump is proportional to the average flow and tooth, while the square proportional to the modulus. Small size, light weight, simple structure, easy to manufacture, low price, reliable work, good self-priming performance, insensitive to oil contamination, convenient maintenance and so on. 2) The flow of three-screw pump is proportional to tooth width, but the increase of tooth width is limited by the increased hydraulic radial force of gears. Generally, tooth width B = (6 ~ 10) m and small value when high pressure. In addition, the volumetric pump, the three screw pump flow pulsation maximum. 3) The speed of rotation can improve the flow of the pump, but it is limited by the pumping function. Gear pump speed is generally 1000 ~ 1500r / min. 2, three screw pump pressure compensation End gap automatic compensation principle: the use of special access to the three screw pump pressure oil pressure chamber led to the outer side of the floating sleeve, the role of a certain shape and size of the area, resulting in hydraulic Force, so that the sleeve pressed to the gear end face, the force must be greater than the role of gear inside the role of the inner sleeve, in order to ensure that under a variety of pressures, the sleeve is always close to the gear surface automatically reduce the three screw pump through the end face The leakage, to achieve the purpose of improving pressure. The disadvantage is: large flow and pressure pulsation, noise, displacement and other variables. 3. Three screw pump trapped oil phenomenon and the phenomenon of unloading trapped oil hazards: the dead volume in the sharp increase in pressure, the bearing is subject to a large additional load, while producing power loss and liquid fever and other adverse phenomena; dissolution The air in the liquid will analyze the production of gas bubbles, gas anger phenomenon, causing vibration and noise. Eliminate the phenomenon of oil trapped: in the three screw pump on the side plate or floating sleeve to open the trough. Asymmetrical, it is necessary to ensure that the suction and pressure chambers can not be brought into direct contact with each other at all times; such gear pumps can not be reversed. Three screw pump in use, pay attention to the different forms of features and performance, often in use, different problems and reactions, in use to ensure the normal use of problems promptly solve the different aspects of control, in accordance with the normal way get on.
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