screw pump working principle and characteristics of screw pump

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valve knowledge: screw pump working principle and characteristics of screw pump is a single-screw transport pumps, it is the main working parts of the eccentric screw of the spirochete (called rotor) and the inner surface of the screw of the wire spiral surface lining set (called the stator). Its working principle is t hat when the motor drives the pump shaft, screw on the one hand around the axis of rotation, on the other hand it is rolling along the bush surface, thus forming a sealed chamber of the pump. Screw revolution, the liquid seal cavity forward a pitch with the continuous rotation of the screw, the liquid spiral way from a sealed chamber pressure sealed chamber to another, and finally extrusion pump. The screw pump is a new type of transmission fluid machinery, has a simple structure, safe and reliable operation, easy maintenance, continuous and uniform fluid pressure is stable.
A rotation of the screw to suction the liquid pump, it is most suitable for the suction of viscous liquid.

Basic working principle of a screw pump

The screw pump is the use of screw rotation to suction the liquid. Middle screw to screw the initiative, motivated by the original rotation, both sides of the screw is driven screw with the active screw reverse rotation. The main, driven screw thread are double-headed thread.

Screw mesh with each other and work closely with the screw and liner tube wall, between the inlet and outlet of the pump, it will be separated into one or more of the sealed space. With the rotating screw and meshing these confined space continuously formed in the pump suction side, the liquid in the suction chamber enclosure which continuously push to move to the discharge end and along the screw axis from the inhalation chamber, will be closed in each space The liquid discharged continuously, as if a nut rotation in the thread is constantly pushing forward the case, which is the basic working principle of the screw pump.

The sealing surface between the screw and the shell is the surface of a space. On this surface the existence of non-sealed area such as the class of ab or de, and the screw groove part of the formation of many gaps in the triangle abc and def. These gaps in the triangle constitutes a liquid channel, so that the initiative to screw groove A and driven screw on the groove B, C connected to pass. While groove B, C along their spiral wound to the back, respectively, and the groove on the back of D, E, connected to pass. In slot D, E slot F (it belongs to the other end of the spiral) the convergence of the sealing surface, there are also similar to the front triangle gap a\\ b\\ c \\ , D, F, and E will also be the same. In this way, the groove ABCDEA also form a shape of \"∞\" confined space (such as a single thread, the groove along the axial drive screw Rao, the suction port through can not form a seal). Not difficult to imagine a number of independent \"∞\" shape to seal the space will be formed in such a screw, a sealed space occupied by the axial length exactly equal to tired and bar lead t. Therefore, in order to make screw can absorb the oil discharge port separated off, the length of the screw thread at least more than one lead.

As can be seen from the above-mentioned works, screw pump has the following advantages:hydraulic hose assemblies

1) The wide range of pressure and flow. Pressure of about 3.4-340 kgf / cm2, the flow rate of up to 18600cm3 / min;

2) delivery of the liquid type and viscosity of a wide range;

3) because the lower parts inertia force of the rotary pump, it can use a high speed;

4) inhalation of performance, the ability to self-absorption;

5) uniform flow of continuous, small vibration, low noise;

6) compared with other rotary pumps, gas and dirt to enter the less sensitive;

7) solid structure, installation and maintenance easy.

The disadvantage of the screw pump, screw machining and assembly of higher; pump performance liquid viscosity sensitive.hydraulic couplings

Three screw pump structure

It is mainly composed of active screw placed in the pump cylinder and meshing with two driven screw fixed to the bushing in the pump (pump cylinder). Three screw meshing with each other, each lead in the pump cylinder to form a sealed chamber, causing the seal between the suction port.

Pump work, due to the symmetry around the screw and take the initiative to screw meshing of two slave, so the radial force acting on the active screw completely balanced, active screw is not subjected to bending load. Driven screw suffered radial force along its entire length by the pump cylinder bushing to support, therefore, do not need the outer end of another bearing, basically not subjected to bending loads. In operation, the layer formed between the screw cylindrical surface and the pump cylinder wall oil film prevents direct contact between the meta l screw tooth surface wear is greatly reduced.

Screw pump work at both ends, respectively, the role of the suction pressure of the liquid to produce axial thrust on the screw. Pressure is less than 10 kgf / cm2, a small pump can be used to thrust bearing. In addition, active screw central hole high pressure oil into the bottom of the sleeve of the screw, screw the bottom opposite to the direction of axial thrust balance thrust.

And other positive displacement pump, screw pump when the pump outlet is completely closed, the pump pressure will rise to the damage to pumps or motor overload degree of risk. Therefore, the pump suction mouth, you must set the safety valve.

Screw pump shaft seal, usually with mechanical shaft seal, and can take different forms according to the level of work pressure.