Brief description of the various kinds of pumps

Pumps can be distinguished by type depending on the method of moving fluid. Thus we can distinguish two main types of pumps:

Centrifugal Pumps
Use the movement of fluid through centrifugal force. Pumps that move liquid through this method is called centrifugal pumps. This solution is suitable for moving homogeneous liquids.
Displacement pumps
Use the movement forced the displacement of portions of fluid from the working chamber in the penstock, by changing the working volume of the chamber or the mechanical movement of portions of the liquid. Pumps that work on such a principle called positive displacement pumps. Displacement pumps do not violate the structure of the pumped liquid.

* Rotary pumps
* Hydraulic gear pumps with external gearing gears
* Gear pump with internal gears gears
* Impeller pumps
* Claw Pumps
* Peristaltic pumps
* Screw Pumps

Rotary Pumps
Rotary pump - the general name of forced displacement pumps, which move with the fluid motion of the rotor, cam / wedges, screws, blades / vanes or similar parts in a fixed housing. Usually it is necessary in the inlet / intake and exhaust valves do not.
Gear pumps with external gearing gears

The simplest type of pump with forced displacement, which causes a change in the volume of the cavities coupled between a gears with independent drives. Pump is a powerful and inexpensive. Most gear pumps pumping viscous liquids without inclusions. It is necessary that the liquid wetted material of the working chamber and gears. It is also necessary to pay attention to when selecting the type of mechanical seal, which is selected by the characteristics of pumped liquid.

Benefits gear pump

* Ability to create great pressure
* The ability to pump highly viscous and high temperature liquids
* Easy maintenance
Low cost *
* Ability to change the direction of transfer

Disadvantages gear pump

* Self-priming is absent
* Work on a dry disastrous
* Violates the structure of the fluid and destroys suspension

Gear pump with internal gears gears

This is a variation of gear pumps in which the driven gear is located inside the drive gears larger diameter and rests on a steel crescent. This design has a larger volume of displacement during rotation of gears, allowing full engagement with the internal pump has the suction effect.

Advantages of the gear pump

* The ability to create great pressure
* The ability to pump highly viscous and high temperature liquids
* Easy maintenance
* Low cost
* Can suck the liquid in the chamber filled
* You can change the direction of transfer

Disadvantages gear pump

* Work on a dry disastrous
* Violates the structure of the fluid and destroy the suspension

Impeller pump
The impeller, with the blades of an elastic material, rotates inside the eccentric housing, resulting in bending of the blades and the displacement of fluid from the pump. A change in the bulk action pump priming, can pump viscous liquids and suspensions.

Benefits impeller pump

* Ability to raise the liquid from a depth of 5 meters, including the dry
* The ability to pump viscous liquids and slurries, fluid inclusions
* Easy maintenance
* Low cost
* Simple design
* Lack of cavities in the chamber
* You can change the direction of transfer

Disadvantages impeller pump

* Prolonged work on the dry disastrous for the impeller
* Restriction on the temperature of the fluid (depending on the type of elastomer)
* Restriction on the transfer of many types of aggressive substances (depending on the type of elastomer)
* The existence of depreciable item

Lobe pump

The fluid moves inside the working chamber of the pump by the rotation of two independent rotors. Due to the high precision of the pump housing and rotors between them are small gaps that prevent backflow of the liquid inside the pump. The path of the liquid in the pump is optimized, a working chamber does not have cavities, which is the accumulation of pumped product, which makes the cam pumps popular in such industries as food and beverage, dairy, pharmaceutical promyshlennosti.Obychno used for pumping viscous liquids and suspensions, this pump can also pump liquids with large inclusions, such as jam with whole berries. In the selection of cam pump is essential to take into account all the factors of its future work. Work in low bay pump leads to cavitation, which is devastating for the cams, slugging and overflow can disrupt alignment of shafts, which will lead to jamming the pump. The correct pump works for a long time with minimal operating costs.

Advantages cam pump

* The ability to pump viscous liquids and slurries, liquids with large inclusions
* Smooth flow at the pump outlet
* Lack of cavities in the chamber
* Lack of wearing parts
* Low cost of operation
* Extremely delicate transfer without disrupting the fluid inclusions and fracture
* Sterile transfer
* Low speed cams, the absence of noise and vibration
* You can change the direction of transfer

Disadvantages cam pump

* High cost of pump

Peristaltic pump

The main working element in pumps of this type is a flexible multi-layered sleeve of elastomer. The pump motor rotates the shaft with the shoes (wheels) which restricts the pump hose, moving the volume of fluid inside the sleeves. There are no mechanical seals, the working chamber filled with lubricating fluid, the pump is not heating up at work.

The advantages of a peristaltic pump

* Self-priming liquid from a depth of 9 meters
* No mechanical seal
* Proportional to the flow, the pump can make dosing
* Pumping abrasive liquids and fibers, corrosive substances
* Is not afraid of running dry
* Pump is unpretentious in operation
* Simple design
* You can change the direction of transfer

Disadvantages of a peristaltic pump

* The wearing sleeve
* Hydraulic hammers at work, preferably free access
* High cost

Screw pump

Home working part of the screw pump - a pair of rotor-stator. Metal rotor spiral shape inside the stator (holder) made of elastomer. When the rotor changes the volume of cavities inside the pair and the liquid moves along the axis of the pump, squeezing due to rotation of the rotor, the change in volume in the cavities creates a suction effect.

The advantages of a screw pump

* Self-priming liquid from a depth of 9 meters
* Proportional to the flow, the pump can make dosing
* Pumping abrasive liquids and fibers, viscous substances with inclusions
* Pump is unpretentious in operation
* Simple design
* You can change the direction of transfer
* Smooth flow at the exit

Disadvantages of a screw pump

* The wearing stator
* Invalid prolonged work on the dry course