First, the overview of screw pump 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, the liquid in the suction chamber is enclosed therein and continuously displaced in the axial direction of the screw from the suction chamber to the discharge end, to be enclosed in the 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. It can be seen from the above working principle, screw pump has the following advantages: 1, a wide range of pressure and flow. Pressure of about 3.4-340 kgf / cm 2, the flow rate of up to 18600cm3 / min; 2, the type and viscosity of a wide range of liquid transport; 3, because the rotary inertia force within the pump is low, it can use high speed ; 4, good inhalation performance, self-priming capability; 5, continuous flow, small 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 disadvantage of the screw pump is that the screw machining and assembly requirements are higher; the performance of the pump is sensitive to changes in the viscosity of the liquid. Second, the working principle of the screw pump Screw pump is a positive displacement pump, the main components are the rotor and stator, the rotor is a large gear teeth large and small screw internal diameter of the screw (rotor) stator is the match of the double-headed screw Line and screw sleeve, thus forming a space between the rotor and the stator storage medium, when the rotor is running in the stator, the medium axially from the suction end to the discharge movement. Third, the characteristics of the screw pump 1, the stator and the rotor contact screw seal line income chamber and the discharge chamber is completely separated, so that the pump has a valve partition; 2, can achieve liquid, gas, solid heterogeneous transport; 3, The volume of the pump fluid flow does not change, there is no Swiss flow agitation and pulsation; 4, elastic stator volume chamber can effectively reduce the transport of solid particles containing medium wear; 5, the input medium viscosity up to 50000Mpa · s Solid up to 50%; 6, flow and speed is proportional to the amount of automatic adjustment with the governor pump can be positive and negative transport. Screw pump has the following advantages: 1, compared with the centrifugal pump without the need to install the valve flow is a stable linear flow; 2, compared with the plunger pump self-priming ability, high suction height; 3, and the diaphragm Pump compared to the screw pump can deliver 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 screw pump can deliver high viscosity substances; Plug pump, diaphragm pump and gear pump is different, the screw pump can be used for filling and metering drugs. More Keyword Search: Screw Pump
Cold Drawn Steel Flat Bar
Cold drawn steel flat bar is produced by cold drawn from hot rolled steel flat bar. Compared to steel flat bar cut from the steel plates. Our advantages of cold drawn steel flat bars:
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