pendulum pumps

8/10/2019 Pendulum Pumps

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A

Report on

endulum

Water

ump

SUBMITED TO,

*******************************.,********.

AFFILATED TO

GUJARAT TECHNOLOGICAL UNIVERSITY.

PREPARED BY,

**************.


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Introduction

Purpose: It can be compared to the heart of a human being. The main purpose of

the pump is to create the flow of fluid through the system and thus assist transfer of

power and motion.

Location: The pump is coupled to and driven by the prime mover of the system,

which is most often anelectric motor but in this case without motor. The inlet side of

the pump is connected to the reservoir: the outlet or pressure side, is connected to the

control valve and thus to the rest of the system.

Principal of Pendulum Pump:

A Pump is a device which converts the mechanical energy in to hydraulic energy.

Application:

Water supply

Gasoline Supply

Chemical movement

Sewage movement

Marine services


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Position of Pump in Hydraulic circuit


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Positive Displacement Pump

Positive displacement pumps are those whospumping volume changes from maximum

to minimum during each pumping cycle. That is, the pumping element expands from a

small to large volume and is then contracted to a small volume again.

Positive displacement pumps are used where pressure is the primary consideration. In

this pump high and low pressure areas are separated.so that the fluid cannot leak back

and return to the low pressure source.

Advantages of Positive Displacement Pumps

PD pumps are widely used in hydraulic system

They can generate high pressure

They are relatively small and enjoy very high power to weight ratio

They have relatively high volumetric efficiency

There is relatively small change of efficiency through the pressure range

Non-Positive Displacement Pumps (NPD)

Pumps where the fluid can be displaced and transferred using the inertia of the fluid in

motion are called non-positive displacement pumps. Some examples of such pumps are

Centrifugal pumps, propeller pumps, etc..

They are usually used for low pressure (up to 40 bar) and high volume systems.

The impeller imparts kinetic energy to the fluid. Hence centrifugal pumps are hydro-

dynamic or hydro-kinetic power generators.

Advantages of non-positive displacement pumps

There is a low initial cost

There is minimum maintaince cost

They can be operate quitely

Simplicity of operation


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High reliability

They are capable of handling almost any type of fluid for example, sludge and slurries

GEAR PUMP

(EXTERNAL GEAR PUMP)


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EXTERNAL GEAR PUMP

Gear Pumps

(External Gear)

Advantages:

Cheap (easy to manufacture)

Compact

Dis-Advantages:

Limited pressure capability

Fixed displacement

It can be noisy(gear mesh noise)

Volumetric efficiency is less


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Gear Pumps

(Internal Gear)

Advantages:

Similar to external gear pumps in many respect

Gear slap is reduced

Dis advantages:

Somewhat difficult to manufacture

Fixed displacement

Some issues of unbalanced forces


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VANE PUMPS:

Fixed displacement, unbalanced pump

Parts:

(1) Vanes

(2) Rotor

(3) Delivery port

(4) Inlet port

(5) Housing


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Balanced vane pumps :

Displacement:

D = /2(Dc-DR)eL

C = Cam

R = Rotor

E = eccentricity

L= depth

Advantages:

Quieter than gear pumps.

Higher pressure capability than gear pumps


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Better volumetric efficiency than gear pumps

Can be balanced in design for longer life

Variable displacement an option

Disadvantages:

More complex and expensive than gear pumps

Piston Pump


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Swash Plate Axial Piston Pump

Checklist

Working pressure

Pump speed

Leckage losses

Volumetric & Overall efficiency

System Temperature

Suction Condition

Power to weight Ratio

Cost of pump


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Centrifugal Pump


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HAND WATER PUMP WITH A PENDULUM

New and technically original idea - hand water pump with a pendulum - provides alleviation of

work, because it is enough to move the pendulum occasionally with a little finger to pump

the water, instead of large swings. Using the minimum of human strength in comparison topresent classic hand water pumps enables efficient application in irrigation of smaller lots, for water-

wells and extinguishing fires even by old people and children, which was proved by a large number of

interested future consumers during the presentations.

Hand water pump with a pendulum is a realisation of a new, original, and even

unbelievable, by very simple solution for pumping water. Work is alleviated because easier,

long-lasting and effortless use of the hand water pump has been enabled. Input energy forstarting the process of pumping, in form of occasional pushing of the pendulum, is much less

than with typical hand pumps.

Hand water pump with a pendulum for pumping water out from wells or reservoirsconsists of a cylinder (1) with a piston (2), lever system (3), a seesaw (4), a pendulum (5), a

reservoir (6) and output water pipe (7).

To get the water running out of the pump, the pendulum needs to be out of balance. Afterthat, based on gravitational potential, the piston starts oscillating and the continuous stream of

water is coming out of the output pipe. The pendulum should be occasionally pushed, to

maintain the amplitude i.e. the stream of water. The pump works well with all sizes of the

pendulum, but mainly with the amplitude of 90.

The advantage of this invention compared to present hand pump solutions are: less forceto start the pump, less water consumption, both arms can be used to fetch the water.


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Picture 2. Side view of the pump and the position of

the piston, lever and the pendulum during operation of

the pump.

It is possible to pump out a 1200 litres of water per hour, without any fatigue andcontinue with the pumping. Both arms are free for fetching water, and both elderly and childrencan use it, since maintaining the oscillation of the pendulum does not request any special training

or dexterity


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Whereas typical hand pumps require significant effort and an average person can use the

pump continuously only for several minutes, the hand water pump needs the minimum of theeffort, because it is only necessary to swing the pendulum and maintain the oscillation for several

hours, without any fatigue. So far, there was a lot of interest for the application of the hand water

pump with a pendulum both in domestic and foreign markets, as well as for further developmentof the product.

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