First, the structural characteristics of the 3G series three screw pump Screw pump is transported liquid in the pump for continuous, uniform linear motion, without stirring, small pulsation, the flow, pressure stability, smooth work, vibration, noise. Screw pump has a high self-suction capacity, does not require the bottom valve or vacuum accessory equipment. The driving screw is driven by the motor. The driven screw is driven by the liquid pressure. The oil film is protected between the screws and between the screw and the pump sleeve. The mechanical friction of the pump is small. Therefore, the pump has high efficiency and long service life. Pump suction, double suction, horizontal, vertical, in order to protect the pump, motor and piping systems, pumps with safety valve. Second, the scope of application of three series of three screw pump: three screw pump suitable for conveying non-solid particles, non-corrosive, with lubricating oils and similar lubricants, viscosity of 1.2-1000E (3-760mm2 / s ), Temperature ≤150 ℃. The 3G three-screw pump is mainly composed of a bushing (pump cylinder) fixed in the pump body and an active screw rod inserted in the pump cylinder and two driven screws engaged with the same. Three intermeshing screws, in the pump cylinder by each lead to form a sealed chamber, resulting in suction and discharge between the seal. Pump work, due to the two driven screw symmetrical with the active screw meshing, so the role of the radial force on the active screw completely balanced, the active screw does not bear the bending load. The radial force exerted by the follower screw is supported by the pump cylinder bushing along its entire length. Therefore, it is not necessary to provide a separate bearing on the outer end and substantially not to bear the bending load. In operation, a layer of oil film formed between the outer surface of the screw and the inner wall of the pump cylinder can prevent the direct contact between the metal and greatly reduce the wear of the screw tooth surface. Screw pump work, both ends of the role of the liquid suction pressure, so the screw to produce axial thrust. For small pumps with differential pressure less than 10 kgf / cm2, thrust bearings can be used. In addition, high pressure oil is introduced into the bottom of each screw sleeve through the center bore of the active screw to create a balanced thrust at the lower end of the screw that is counter to axial thrust. Screw Pump Like other positive displacement pumps, when the pump outlet is completely closed, the pressure inside the pump rises to the point of damaging the pump or overloading the motor. Therefore, the suction pump outlet, you must set the safety valve. Three screw pump is the use of screw rotation to suction and discharge liquid. The middle of the screw for the active screw, driven by the prime mover rotation, the screw on both sides of the driven screw, with the active screw for reverse rotation. The main, driven screw thread are double-headed thread. Due to the mutual engagement of the screws and the close cooperation of the screw with the inner wall of the liner, one or more sealed spaces are separated between the suction and discharge of the pump. As the screw is rotated and engaged, these sealed spaces are constantly formed at the suction side of the pump, sealing the liquid in the suction chamber therein and continuously displacing in the axial direction of the screw from the suction chamber to the discharge end to be closed in the respective spaces Continued discharge of liquid, like a nut in the screw rotation is constantly moving forward, as the case, which is the basic working principle of the screw pump. From the above principle can be seen screw pump has the following advantages: 1) wide pressure and flow range. A pressure of about 3.4-340 kgf / cm 2, a flow rate of up to 18,600 cm 3 / min; 2) a wide range of fluid types and viscosities to be transported; and 3) a high rotational speed ; 4) good suction performance, self-priming capability; 5) uniform flow rate, low vibration, low noise; 6) compared with other rotary pumps, the gas and dirt into the less sensitive; 7) solid structure, installation Easy to maintain. The shortcomings of the screw pump is: the screw machining and assembly requirements are higher; the performance of the pump is more sensitive to changes in the viscosity of the liquid. How it works: Screw pump is a positive displacement pump, the main components are the rotor and stator, the rotor is a large gear tooth large and small spiral inner diameter of the screw (rotor) stator is the matching double-headed spiral and screw , Thus forming a space between the rotor and the stator to store the medium. When the rotor runs in the stator, the medium is axially moved from the suction end to the discharge end. Features The stator and rotor contact screw seal line will completely separate the income chamber and the discharge chamber, so that the pump has a valve blocking effect can be achieved, the liquid, gas, solid multiphase pump fluid flow volume does not change, there is no Rui Liu Stiffness and the formation of venous stator cavity volume can effectively reduce the transmission of solid particles containing medium wear Medium viscosity of up to 50000Mpa · s Solid content of up to 50% Flow rate and speed proportional to the governor can achieve the amount of Automatic adjustment pump can be positive and negative delivery.
