PERISTALTIC & ROTODYNAMIC PUMP

PERISTALTIC (HOSE) PUMP-PUMPING EQUIPMENT OF POSITIVE DISPLACEMENT ACTION WITH EASY CONSTRUCTION, HOWEVER, UNCOMMON OPERATION PRINCIPLE. A VERSATILE TUBE OR HOSE IS THE OPERATIONAL DEVICE OF THE PERISTALTIC PUMP. THIS HOSE ENVELOPS THE ROTOR WITH ROLLERS ON THAT. THE HOSE MAY BE PRESSED AGAINST ROLLERS BY TENSION FORCE OR ROLLED AGAINST THE SPECIAL SURFACE. THE HOSE IS PINCHED, INTERACTING WITH A ROLLER AND A PART OF ITS VOLUME IS SEPARATED BY THIS ACTION. WHEREAS THE ROTOR ROTATES, THESE SEPARATED VOLUMES MOVE INSIDE THE HOSE TILL ENTERING INTO THE DISCHARGE SECTION OF THE HOSE.

This type of construction provides many benefits over most of the different pumps, making peristaltic pumps irreplaceable in some cases. The main feature of those pumps is that there’s no metal-metal contact throughout the operation, which dramatically extends the service life of its moving components (except for the hose). There’s no contact between the medium and pump parts. The latter feature has a light-emitting diode for wide usage of peristaltic pumps in drugs and pharmacies, wherever transferring medium is necessarium. At the same time, no deformation and contamination, as is just in the case of blood-forced circulation. SA versatile component (tube or hose) is vulnerable to wear, which is similar, simplifying service and repair. This kind of pump is additionally self-primed. At an equivalent time, the most developed pressure of peristaltic pumps is low, the versatile component is vulnerable to high wear, and its most operational temperature is restricted.

Diagram of peristaltic (hose) pump operation principle

Rotodynamic pump

MAIN KINDS OF ROTODYNAMIC PUMPS:

Impeller:

• Centrifugal
• Axial (propeller-type)

Friction:

• Vortex
• Disc
• Worm

CENTRIFUGAL PUMP – ONE OF THE FOREMOST WIDELY IDENTIFIED AND USED SORTS OF PUMPS. ADDITIONAL ENERGY IS DELIVERED TO A PUMPED-UP FLUID BY FORCE THAT ACTS UPON TRANSFERRED MEDIUM FROM BLADES THAT ARE BOLT MOUNTED ON THE OPERATING WHEEL IN THE PUMP BODY. THE BLADE IS STIFFLY MOUNTED TO A SHAFT DRIVEN BY THE ENGINE. COMPARED TO MOST OF THE POSITIVE DISPLACEMENT PUMPS, THE CENTRIFUGAL PUMPS AREN’T SELF-PRIMED, AND BEFORE BEGINNING, THEY NEED PRELIMINARY PRIMING WITH FLUID.

Centrifugal pump production involves some difficulties. This type of pump cannot operate with significant fluid flow rates; fluid is delivered continuously without distinctness, which is inherent for positive displacement pumps. However, the operation and mating of those pumps are pretty straightforward. In case of an operating blade malfunction, it’s simple to dismantle the operating shaft and replace it with a new one. The absence of valves in constructing centrifugal pumps also contributes to their dependableness and resistance to any inclusions in the transferred medium. Axial force ineluctably is throughout the pump operation. Many engineering solutions are enforced to compensate for such power, like installing the second blade onto the shaft to eliminate axial forces. It’s attainable to extend the head of the pump by serially installing many impellers on a single post and providing multi-stage construction.

Diagram of pump operation principle

AXIAL PUMP – BLADE PLACED IN THE CYLINDRICAL BODY. ONCE THE VANE ROTATES, A PRESSURE DIFFERENTIAL IS MADE ON ITS OPPOSING SIDES, AND FLUID IS TRANSFERRED BY THIS ACTION. THE AXIAL PUMP NEEDS PRIMING BEFORE STARTING, JUST LIKE THE CENTRIFUGAL ONE.

Axial pumps provide lesser heads compared to similar centrifugal pumps. However, their extreme simplicity of construction and chance to put the pump directly into line create them significantly preferred in some cases.

Diagram of axial pump operation principle

VORTEX PUMP – HYDRAULIC MACHINE OF ROTODYNAMIC ACTION. THE OPERATIVE DEVICE IS A BLADE WITH RADIAL OR INCLINED BLADES. THE BLADE IS PUT IN INSIDE THE BODY WITH A NOMINAL GAP. BLADE AND BODY PRODUCE FREE ROUNDED AREA. ONCE THE BLADE ROTATES, INCOMING WATER FLOW IS WHIRLED BY BLADES AND VORTEXES AREA UNIT CREATED BY THIS ACTION. IN THE MEANTIME, BLADES ACCELERATE FLUID MANY TIMES WHEREAS IT FLOWS THROUGH THE ROUNDED CAVITY OF THE PUMP

Usually, vortex pump area units are compared to centrifugal pumps since they need several standard options and might be used for similar functions. Due to fluid motion patterns inside the body, this kind of pump creates a higher head than a similar pump. Therefore, once necessary, it is used to feed fluid with a comparatively low flow, however, with a high chair. Additionally,s reversible, i.e. it will operate in forward and reverse directions and is self-primed compared to centrifugal pumps. These options enable victimization vortex pumps to transfer gas-air mixtures and liquefied gasses. Decreased efficiency constant is a disadvantage of the vortex pump.

DISK PUMP – HYDRAULIC MACHINE OF ROTODYNAMIC ACTION, WHEREVER MEDIUM IS TRANSFERRED WHILE NOT IMPACTED. THE CONSTRUCTION OF THOSE PUMPS IS COMPARABLE TO CENTRIFUGAL PUMPS. HOWEVER, THE CONSTRUCTION OF THE VANE DIFFERS GREATLY. IN THE OPERATION DEVICE OF, THE DISK PUMP CONSISTS OF CLOSELY MATCHED DISKS ON A SINGLE SHAFT, AND THESE DISKS DON’T HAVE ANY BLADES. TRANSFERRED FLUID MOVES FROM THE CENTER OF DISKS TO THEIR BOUND, AND THIS MOVEMENT IS PROMOTED BY THE STREAMLINED FLOW OF FLUID LAYERS CLOSE TO DISKS THAT DRAW AWAY INTERMEDIATE LAYERS.

Transfer of medium while not impacting gives disk pumps many vital blessings that outline the space of their pertinency. The low noise of such pumps is essential, yet as the delicate handling of operating medium, once the pump has virtually no result on medium. A further advantage during this case is a low reverse influence, so it’s better to use disk pumps for abrasive medium pumping. The aThe ability to work below the very high moving speed of the operating shaft is also necessary since this feature provides for top cavitation qualities of disk pumps. All expressed blessings, together with the simplicity of construction and production, justify the usage of those pumps in several cases despite the comparatively low potency constant.

Diagram of disk pump operation principle

THE COMBINATION OF ALL TRANSFERRED PARTS FORMS THE MEDIA’S FLOW THROUGH THE PUMP. WORM PUMP – CONSISTS OF TWO MAIN COMPONENTS. ONE IN ALL OF THEM IS A ROTOR, WHICH IS STATED BECAUSE OF THE WORM, AND THEREFORE THE OTHER IS A MECHANICAL DEVICE, THAT IS, THE PUMP BODY. THE WORM IS FACTORY-MADE OUT OF CORROSION AND ABRASION-RESISTANT METALS, AND THE MECHANICAL DEVICE HAS AN INNER LINING FABRICATED FROM MANY VARIETIES OF ELASTOMERS. ONCE THE ROTOR ROTATES, IT CATCHES, THEN SEPARATES WHEREAS, RETURNING INTO CONTACT WITH THE MECHANICAL DEVICE AND PUSHING THROUGH PARTS OF THE TRANSFERRED MEDIUM.

Because of worm pumps’ construction, which doesn’t produce impact forces for transferred material, they’re applied for sharing of fluids that, in step with the operation process, shall not be broken throughout transportation in the pipeline. This sort of pump is successfully used for transferring thick and viscous mediums, so this pump is widely applied in the food, chemical and petrochemical industries.

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