26987828 Diaphragm Ppt

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³DESIGN AND PERFORMANCE ANALYSIS OF³DESIGN AND PERFORMANCE ANALYSIS OFMECHANICALLY DRIVEN DIAPHRAGM PUMP´MECHANICALLY DRIVEN DIAPHRAGM PUMP´

PREPARED BY:-

DEEPAK M. BHATIA

AVINASH PAL

ANUJ CHOWDHRY

8/6/2019 26987828 Diaphragm Ppt


ABSTRACT

� It¶s a Metering Pump, that displaces a predeterminedvolume of liquid in a specific period.

� This pump is a positive displacement machine; if isalso known as a controlled-volume, proportioning or chemical-injection pump.

DEFINITION

� A diaphragm pump is a device that uses an elastomeric part (diaphragm) to transport a fluid.

� The diaphragm is moved back and forth by areciprocating mechanism.

� The eccentric drive is there which gives morefluctuation i.e. at the end of stroke; it gives jerks whichaffects the flow.

WORKING

8/6/2019 26987828 Diaphragm Ppt


INTRODUCTION HISTORY:-

1) In the 1940s, the USA started an extensive program to help synthetic elastomer

achieve a worldwide breakthrough.

2) Using high-quality elastomer materials, new technical possibilities eventually

opened up for the design and use of diaphragm pumps .

3) Later, hydraulically driven diaphragm compressors came onto the market that

were able to produce high pressures of up to 4,000 bar.

PUMPS:-

1) A pump is a device used to move liquids or slurries.

2) It is used to move liquids from lower pressure to higher pressure .

DIAPHRAGM PUMPS:-

1) It¶s a diaphragm pump is a positive displacement pump.

2) Uses a combination of the reciprocating action of a rubber or Teflon diaphragm

and suitable non-return check valves to pump a fluid.

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TYPES OF DIAPHRAGM PUMP:-

1) In the first type, the diaphragm is sealed with one side in the fluid to be pumped,

and the other in air or hydraulic fluid.

2) The second type of diaphragm pump works with volumetric positivedisplacement, but differs that the prime mover of the diaphragm is neither oil nor air;

but is electro-mechanical working through a crank/ geared motor drive.

3) The third type of diaphragm pump has one or more unsealed diaphragms with the

fluid to be pumped on both sides.

8/6/2019 26987828 Diaphragm Ppt


HIGH-SPEED LIQUID DIAPHRAGM PUMPS

A special type of pump based on the technology of diaphragm pump.

Employs a mechanical drive for transferring, evacuating and compressinggases.

Are also used for siphoning off liquids or air-liquid mixtures.

FEATURES

� Small Diaphragm Strokes.

� Low rotational speeds.

� Stiffer diaphragms and the use of diaphragmsupports.

� Lower compression ratios.

� Drive and shaft support being more robustlyconstructed.

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WORKING

8/6/2019 26987828 Diaphragm Ppt


DESIGN, FUNCTION AND PROPERTIES OF

DIAPHRAGM PUMPS

� An elastomer diaphragm is moved up and down by aneccentric.

� The compression chamber is hermetically sealed fromthe drive mechanism by the diaphragm.

� The pump transfers, evacuates, and compresses

completely oil free.

PRINCIPLE

� Uncontaminated transfer, no pollution of the media.� 100% maintenance free.

� Compact design.

� Smooth running.

� Easy installation.

FEATURES

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1) Elastic Diaphragm

2) Pump Head

3) The Housing

4) The Connecting Rod

5) Clearance

6) The Diaphragm Fixing Screw

7) Transfer Compartment

8) Outlet Pressure Valve

9) Inlet Pressure Valve

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OPERATION OF A LIQUID DIAPHRAGM PUMP

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CRITERIA FOR SELECTION OF PUMP

Type of gas

Required pneumatic performance

Gas temperature

Temperature of the surroundings

Other conditions related to the surroundings

Type of motor Possible constructional parameters

Mounting position and orientation

Operating conditions

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DESIGN OF DIAPHRAGM

Control Parameters:

Maximum speed Nmax= 250 rpm

Diameter to stroke ratio = D/L = 2

Maximum diameter D = 3d

Design Parameters:

1). Discharge

Discharge= Area * stroke length*speed

Qmax = /4 * d2 * L * Nmax

2). Chamber diameter

D = 3d

3). Chamber depth

l = L/2 + 4 mm clearance

4). Eccentricity

e = l/2

5). Control volume

= /4 * D2 * L

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MODEL PERFORMANCE CURVE

Discharge,Qth Vs. Speed

20, 0.25750, 0.643

85, 1.094105, 1.351

155, 1.995

185, 2.38

255, 3.281

275, 3.54

0

0.5

1

1.5

2

2.5

3

3.5

4

0 50 100 150 200 250 300

Speed (rpm)

D

i s c h a r e Q t h

l m

Discharge,Qact s Speed

20, 0.245

50, 0.6

85, 1105, 1.2

155, 1.75

185, 2.05

255, 2.75

275, 2.9

0

0.5

1

1.5

2

2.5

3

3.5

0 50 100 150 200 250 300

speed (rpm)

d i s c h a r g e ( l p m )

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FUTURE SCOPES

Principle of diaphragm pump can be used to make miniature pump i.e. micro pumpwhich will be useful for space and medical application. Following is the micro pump

concept.

There is a range of NASA experiments, instruments and applications whereminiature pumps are needed. To address such needs, a piezo electrically actuatedminiature pump is being developed under a NASA Code S PIDDP task.

Figure 24: Micro diaphragm gas sampling pump e.g. for analytical technology

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REFERENCES

Books

Pump Handbook-Igor J. Karassik, JOSEPH P. Messina, Paul Cooper,CHARLES C. Held.

Material selection in mechanical design-Michael & Ash

Fluid Movers by Nicholas P. Chopey

Pumps & Pumping operation by Nicholas P. Pawl

Metering pump handbook by Robert E. McCabe

Pumping and Processing principle & practice

Fluid Movers

Water well and pump Engineering by A M Michael & S D Khepar

Websit es

www.knf.com

www.positivemetering.com www.pumps_in_stack.com/diaphragm_pump_design.html

www.howstuffworks.com

www.wikipedia.com

www.ebookworld.com

www.syudentshangout.com

8/6/2019 26987828 Diaphragm Ppt


26987828 Diaphragm Ppt

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