Screw pump, which is also called screw,is a type of rotor-toothed type. In it, the head of the injected liquid is formed by its displacement by screw rotors rotating inside the stator. They can be one or more, depending on the configuration of the device. Screw pumps are easily obtained from gears, and this is done by increasing the inclination of the teeth in them, as well as reducing the number of teeth on the gears. However, it is better to use the "original version" of the device.
The screw pump has interestingconstructive features. To increase the quality of seals, as well as to reduce the number of leaks in this type of adaptation, it is customary to use cylindrical or conical elastic bodies. The conical screw is pressed by the spring very reliably, in addition, the pressure of the pumped liquid plays a role here, which significantly reduces the number of leaks. Pumps having a metal casing are capable of withstanding significantly higher loads than their counterparts placed in elastic bodies. The device with a conical screw is able to work well and in a rigid case.
- uniform supply of the substance;
- possibility for pumping liquids with solid additives, without any damage;
- possibility for self-absorption of liquids;
- high pressure at the outlet can be obtained without the mass of injection stages characteristic of other types of pumps;
- during operation, the device generates noise effects at a sufficiently low level;
- The pump mechanism is balanced very well.
This species also has certain disadvantages, which are considerably less than the advantages:
- a sufficiently high degree of complexity in the manufacture of this type of equipment, as well as its high cost;
- Lack of regulation of the working volume;
- use idle is simply unacceptable.