Three screw pump structure and working principlePosted by uuuseff on November 15th, 2019 Three screw pump structure and working principle: Three screw pump is mainly fixed in the pump body in the bushing (pump cylinder) and installed in the pump cylinder in the active screw and its engagement with the two driven screw composition. 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 tight fit 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. The sealing surface between the screw and the housing is a curved surface. There are unsealed areas such as ab or de on this surface and a number of triangular notches abc, def with the groove portion of the screw. The notches of these triangles form a passage for the liquid, allowing the drive screw groove A to communicate with the grooves B, C in the driven screw. The grooves B, C, along with their spiral around the back, respectively, and the back of the grooves D, E communicated. Since there are also triangular notches a'b'c 'similar to the front face on the sealing surfaces where the grooves D, E engage with the groove F (which belongs to the other thread), D, F, E will also communicate. In this way, the groove ABCDEA also form a "∞" -shaped sealing space (such as the use of single-head thread, the groove will be along the axial disk Rao screw, the suction port through, can not form a seal). Not hard to imagine, in such a screw, will form a number of independent "∞" -shaped sealed space, each sealed space occupies the axial length exactly equal to the lead of the tired rod t. Therefore, in order to make the suction and discharge of the screw, the length of the screw thread should be longer than one lead. From the above principle can be seen screw pump has the following advantages: 1) wide pressure and flow range. The pressure is about 3.4-340 kgf / cm2, the flow rate is up to 18,600 cm3 / min; 2) the kind of liquid to be transported and the range of viscosity are wide; 3) the high rotational speed can be used because the inertial force of the rotating parts in the pump is low; 4) good suction performance, self-priming capability; 5) continuous flow, low vibration, low noise; 6) less sensitive to gas and dirt than other rotary pumps; 7) solid structure, easy. The shortcomings of the three 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 spiral seal line will completely separate the income chamber and the discharge chamber, so that the pump has the valve isolation ★ Can achieve liquid, gas, solid heterogeneous mixed transmission ★ Three screw pump fluid flow volume does not occur Change, there is no Rui flow agitation and pulse ★ elastic stator cavity volume can effectively reduce the transmission of solid particles containing medium wear ★ input medium viscosity up to 50000Mpa · s with a solid content of up to 50% ★ flow and speed is proportional to, With the governor volume can be achieved automatically adjust the pump can be transported forward and backward. Three-screw pump has the following advantages: 1, compared with the centrifugal pump without the installation of three-screw pump flow is a stable linear flow 2, and the three-screw pump piston pump with self-absorption ability, high suction height 3, and Diaphragm pump compared to the three screw pump can convey a variety of mixed impurities containing gas and solid particles or fibers of the medium, but also convey a variety of corrosive substances 4, compared with the gear pump can deliver high viscosity material 5, and Plug pump, diaphragm pump and gear pump is different, three screw pump can be used for filling and metering drugs. Wheelbarrow Tyre wheelbarrow Tyre Wheelbarrow Tyre, Wheelbarrow Solid Tyre, Wheelbarrow Tire, Solid Wheelbarrow Tyres QINGDAO HYTANG HAND TRUCK CO.,LTD. , http://www.cnwheelbarrow.com Like it? Share it! More by this author |