Analysis of working principle of screw pump

Analysis of working principle of screw pump
Clicks: 8 Source Website: Yongjia Haitan Pump Co., Ltd. Release time: 2012-12-19

The screw pump uses the rotation of the screw to suck and drain the liquid. Due to the mutual engagement of the screws and the close fit of the screw to the inner wall of the liner, between the suction and discharge ports of the pump, it is divided into one or more sealed spaces. With the rotation and engagement of the screw, these sealed spaces are continuously formed at the suction end of the pump, the liquid in the suction chamber is sealed therein, and continuously pushed from the suction chamber in the axial direction of the screw to the discharge end, which will be enclosed in each space. The liquid is continuously discharged as if a nut was continuously pushed forward while the thread was turning. This is

When the stainless steel single-screw pump is in operation, the liquid is sucked into the sealed space surrounded by the thread and the pump casing. When the driving screw rotates, the screw pump sealing volume increases the screw pump pressure under the screw extrusion and moves in the axial direction. . Since the screw rotates at a constant speed, the liquid outflow rate is also uniform.

The characteristics of the stainless steel single screw pump are: the screw pump has small loss and good economic performance. The pressure is high and uniform, the flow is uniform, the rotation speed is high, and it can be directly connected with the prime mover.

The stainless steel single screw pump can transport lubricating oil, transport fuel, and transport various oils and polymers for conveying viscous liquids.

Transport high viscosity media:

Depending on the size of the pump, media with a viscosity of from 37,000 to 200,000 centipoise can be delivered.

Media containing particles or fibers: The particle diameter can be 30 mm (not exceeding the rotor eccentricity). The fiber length can be 350mm (corresponding to the pitch of the 0.4 rotor). The content is generally up to 40% of the medium enthalpy. If the solid matter in the medium is a fine powder, the highest content can be as high as 60% or higher.

When the conveying pressure is required to be stable and the inherent structure of the medium is not detrimental, the single-screw pump is most ideal.

The pump body vibrates violently or produces noise: Cause: The pump is not installed securely or the pump is installed too high; the motor ball bearing is damaged; the pump shaft is bent or not concentric with the motor shaft, and is not parallel.

Treatment method: stabilize the water pump or reduce the installation height of the water pump; replace the motor ball bearing; correct the curved water pump spindle or adjust the relative position of the water pump and the motor.

The drive shaft or motor bearing is overheated: Cause: Lack of oil or broken bearings.

Treatment: Fill with oil or replace the bearing.

The pump does not produce water:

Cause: The pump body and the suction pipe are not filled with water; the moving water level is lower than the water pump water pipe; the water pipe is broken.

The sealing surface between the screw and the housing is a spatial curved surface. There is a non-sealed area such as ab or de on this curved surface, and a plurality of triangular notches abc, def are formed with the groove portion of the screw. These triangular indentations form a passage for the liquid, allowing the active screw groove A to communicate with the grooves B, C on the driven screw. The grooves B and C are wound along their own spirals to the back, and communicate with the grooves D and E on the back, respectively. Since the grooves D, E and the groove F (which belong to the other head spiral) are joined to each other, there is also a triangular notch a'b'c' similar to the front surface, so D, F, and E will also communicate. In this way, the groove ABCDEA also constitutes a "∞"-shaped sealed space (if a single-head thread is used, the groove will be screwed in the axial direction, and the suction and discharge ports will be penetrated to form a seal). It is not difficult to imagine that on such a screw, a plurality of independent "∞"-shaped sealed spaces will be formed, each of which occupies an axial length exactly equal to the lead t of the tired rod. Therefore, in order to separate the screw suction and discharge ports, the length of the threaded section of the screw is at least greater than one lead.

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