Screw pump

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Advantages of screw pumps and their applications: Screw pumps utilize the rotation of screws to draw in and discharge liquids. The middle screw is the driving screw, which is rotated by a prime mover, while the screws on either side are driven screws that rotate in the opposite direction to the driving screw. The threads of both the driving and driven screws are double-start threads. Due to the intermeshing of the screws and the tight fit between the screws and the inner wall of the cylinder, one or more sealed spaces are formed between the suction inlet and the discharge outlet of the pump. As the screw rotates and meshes, these sealed spaces are continuously formed at the suction end of the pump, enclosing the liquid in the suction chamber. This liquid is then pushed continuously along the axial direction of the screw from the suction chamber to the discharge end, thereby discharging the liquid trapped in each space. It is similar to a nut that is pushed forward continuously as it rotates on a thread – this is the basic working principle of a screw pump. Kaiyuan Pump Valve Co., Ltd. specializes in the production of screw pumps, specifically stainless steel sanitary-grade screw pumps. (http://www.pump-ky.com) Advantages of triple-screw pumps: The advantages and features of triple-screw pumps include a long service life, low tendency to fail, and reliable operation. The standards of the former Soviet Union stipulate that when pumps are used to transport clean mineral oil (with a kinematic viscosity of not less than 0.4 cSt at a temperature of 60°C), the operational life from startup to the first major overhaul should be no less than 25,000 hours; moreover, the interval between failures during normal operation should be no less than 6,000 hours. When the flow rate drops by 15%, the pump's lifespan is considered to have ended. The average service life of Kawasaki products in Japan is over 100,000 hours, while the service life of IMO company’s products is generally between 3 and 20 years. When transporting clean, lubricating fluids, Boyu’s products generally have a service life of tens of thousands of hours, or even longer. Applications of triple-screw pumps: Triple-screw pumps use frequency converters to control flow, and noise levels increase when they operate at low speeds. This is due to the uneven waveform of the input current generated by the inverter, which changes the motor speed, and this also increases the pulsation in the pump’s discharge pressure. Given that the driven screw mentioned in this section rotates under the action of the hydraulic torque generated by the fluid in the sealed chamber, it can be seen that this cycloidal meshing triple-screw pump is also reversible in operation. Moreover, due to the small diameter of the screws, the rotational torque is reduced, and the flywheel effect is minimal; as a result, full-load torque can be generated immediately upon startup, the pump can change direction quickly, and noise levels are low. Bo Yu has conducted full-load continuous startups (shutting down and then restarting) of high-pressure triple-screw pumps, with up to 10 startups per minute. When the pump is stopped, the backflow of high-pressure fluid causes the pump to rotate in the opposite direction immediately; when it is started again, the pump rotates in the reverse direction as well. Its operation is smooth and reliable. Therefore, if fluid from a pressure source is fed into the pump, the triple-screw pump becomes a hydraulic motor that can be used to drive other equipment, at which point the triple-screw pump functions as an prime mover. The difference between a hydraulic motor and a triple-screw pump lies merely in the interchange of the inlet and outlet. In a hydraulic motor, high-pressure fluid enters the pump, while in a triple-screw pump, high-pressure fluid is discharged from the pump; therefore, their rotation directions are opposite. The efficiency of this hydraulic motor remains very high over a considerable range of loads. Pumps with a large screw helix angle, that is, pumps with a large lead, are particularly excellent as hydraulic motors. High quality at low prices – choose us. Durable and long-lasting – choose us. First-class service – choose us. We are experts in wear-resistant repair – Luoyang NPT New Materials Technology Co., Ltd. Please follow us on Weibo: Luoyang NPT New Materials Technology Co., Ltd.; on WeChat: ly-npt; and visit our website at www.lynpt.com