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GEAR PUMP

SAADAT AZEEM

ABDULLAH MASOOD

SALMAN KHALID

ESAAM JAMIL

Project Members

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OUTLINE OF PRESENTATION INTRODUCTION TYPES OF HYDRAULIC PUMPS GEAR PUMP

› INTERNAL GEAR PUMP› EXTERNAL GEAR PUMP

TYPES OF EXTERNAL GEAR PUMP EXPLODED VIEW OF EXTERNAL GEAR PUMP WORKING OF EXTERNAL GEAR PUMP SIMULATION OF OUR PROJECT IN INVENTOR MANUFACTURING PROCESSES INVOLVED

› SAND CASTING› MACHINING PROCESSES

ADVANTAGES AND DISADVANTAGES APPLICATIONS OF EXTERNAL GEAR PUMP COST ANALYSIS Q & A

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INTRODUCTION:

PUMP IS A DEVICE THAT CONVERTS MECHANICAL ENERGY IN A DRIVE UNIT

INTO HYDRAULIC ENERGY OR PRESSURE ENERGY.

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TYPES OF HYDRAULIC PUMPS: HYDRAULIC PUMPS

GEAR PUMP

EXTERNAL GEAR PUMP

INTERNAL GEAR PUMP

ANNULAR GEAR PUMP

SCREW PUMP

ROTATORY VANE PUMP

INTERNALLY PRESSURIZED

EXTERNALLY PRESSURIZED

PISTON PUMP

RADIAL PISTON PUMP

AXIAL PISTON PUMP

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GEAR PUMP:

GEAR PUMP IS A DEVICE USED TO MOVE FLUIDS, SUCH AS LIQUIDS OR SLURRIES ESPECIALLY FOR PUMPING HIGH VISCOSITY FLUIDS. IT USES THE MESHING OF GEARS TO PUMP FLUID BY DISPLACEMENT. GEAR PUMPS ARE FIXED DISPLACEMENT, THAT IS THEY PUMP A CONSTANT AMOUNT OF FLUID FOR EACH REVOLUTION.

THERE ARE TWO MAJOR TYPES OF GEAR PUMP:1) EXTERNAL GEAR PUMP 2) INTERNAL GEAR PUMP

OUR PROJECT IS “ONE STAGE EXTERNAL GEAR PUMP WITH SPUR GEARS”.

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ONE STAGE

MULTI STAGE

TYPES OF EXTERNAL GEAR PUMPTYPES OF EXTERNAL GEAR

PUMP:

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EXPLODED VIEW OF EXTERNAL GEAR PUMP:

8WORKING OF EXTERNAL GEAR PUMP:

1) LIQUID FLOWS INTO THE CAVITY AND IS TRAPPED BY THE GEAR TEETH AS THEY ROTATE2) LIQUID TRAVELS AROUND THE INTERIOR OF THE CASING IN THE POCKETS BETWEEN THE TEETH AND THE CASING3) FINALLY, GEARS FORCES LIQUID THROUGH THE OUTLET PORT UNDER PRESSURE.

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SIMULATION IN SOFTWARE“AUTODESK INVENTOR PROFESSIONAL 2008” OF OUR PROJECT:

10THE MANUFACTURING PROCESSES INVOLVED IN OUR PROJECT OF EXTERNAL GEAR PUMP:MANUFACTURING PROCESSES

PROCESSING OPERATIONS

SHAPING PROCESSES

SOLIDIFICATION PROCESSES

SAND CASTING

MATERIAL REMOVAL

MACHINING PROCESSES

ASSEMBLY OPERATIONS

MECHANICAL FASTENING

THREAD FASTENERS

NUT BOLTS

DOWEL PINS

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SAND CASTING:A SAND CASTING IS A CAST PART PRODUCED BY

FORMING A MOLD FROM A SAND MIXTURE AND THEN POURING MOLTEN LIQUID METAL INTO THE CAVITY IN THE MOLD. THE MOLD IS THEN COOLED UNTIL THE METAL HAS SOLIDIFIED, THEN THE CASTING IS SEPARATED FROM THE MOLD. OUR PROJECT INVOLVED THE FOLLOWING PROCEDURE:

MOLDING•PATTERN MAKING•CORE MAKING•GATING SYSTEM

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MACHINING PROCESSES:

MACHINING IS METAL REMOVAL PROCESS OF MATERIAL FROM A WORK PIECE TO GET THE DESIRED PART SHAPE. OUR PROJECT INVOLVED THE FOLLOWING MACHINING PROCESSES:

MACHINING PROCESSES

CONVENTIONAL MACHINING

FACING

DRILLING

BORING

THREADIN

G

TURNING

MILLING

13PUMP CHARACTERISTICS VALUES AND MATHEMATICAL FORMULAS:

DISPLACEMENT VOLUME :ALSO KNOWN AS THE VOLUMETRIC DISPLACEMENT OR WORKINGVOLUME) IS A MEASURE OF THE SIZE OF THE PUMP.• IT INDICATES THE VOLUME OF LIQUID SUPPLIED BY THE PUMP PER ROTATION (OR PER STROKE).• THE VOLUME OF LIQUID SUPPLIED PER MINUTE IS DESIGNATED AS VOLUMETRIC FLOW RATE Q (DELIVERY).• THIS IS CALCULATED FROM THE DISPLACEMENT VOLUME V AND THE NUMBER OF ROTATIONS N:• Q = n · V

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OPERATING PRESSURE:• THE OPERATING PRESSURE IS OF SIGNIFICANCE FOR THE AREA OF APPLICATION OF PUMPS.

SPEED:• THE DRIVE SPEED IS AN IMPORTANT CRITERION FOR PUMP SELECTION SINCE THE DELIVERY Q OF A PUMP IS DEPENDENT ON THE NUMBER OF ROTATIONS N.• MANY PUMPS ARE ONLY EFFECTIVE AT A SPECIFIC R.P.M. RANGE AND MAY NOT BE LOADED FROM A STANDSTILL. THE MOST USUAL NUMBER OF ROTATIONS FOR A PUMP IS N= 1500 R.P.M.

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EFFICIENCY:• MECHANICAL POWER IS CONVERTED BY PUMPS INTO HYDRAULIC POWER RESULTING IN POWER LOSSES EXPRESSED AS EFFICIENCY.• WHEN CALCULATING THE TOTAL EFFICIENCY ηTOT OF PUMPS, IT IS NECESSARY TO TAKE INTO CONSIDERATION THE VOLUMETRIC ηVOL AND THE HYDRO-MECHANICAL EFFICIENCY ηHM.

ηTOT = ηVOL x ηHM

16DISADVANTAGES

1) HIGH SPEED2) HIGH PRESSURE3) NO OVERHUNG BEARING LOADS 4) RELATIVELY QUIET OPERATION 5) DESIGN ACCOMMODATES WIDE VARIETY OF MATERIALS6) TWO WAY FLUID FLOW IS POSSIBLE

ADVANTAGES

1) FOUR BUSHINGS IN LIQUID AREA 2) NO SOLIDS ALLOWED3) FIXED END CLEARANCES

17APPLICATIONS OF EXTERNAL GEAR PUMP:

COMMON EXTERNAL GEAR PUMP APPLICATIONS INCLUDE, BUT ARE NOT LIMITED TO:

1) VARIOUS FUEL OILS AND LUBE OILS2) CHEMICAL ADDITIVE AND POLYMER METERING3) CHEMICAL MIXING AND BLENDING (DOUBLE PUMP)4) INDUSTRIAL AND MOBILE HYDRAULIC APPLICATIONS (LOG SPLITTERS, LIFTS, ETC.)5) ACIDS AND CAUSTIC (STAINLESS STEEL OR COMPOSITE CONSTRUCTION)6) LOW VOLUME TRANSFER OR APPLICATION

18COST ANALYSIS AND CONCLUSION:

IF WE HAD FABRICATED OUR PROJECT IN THE MARKET,IT WOULD HAVE COST US APPROXIMATELY RUPEES TEN THOUSAND (10,000).

BUT AS THE PROJECT IS THE PRODUCT OF OUR OWN EFFORTS,THAT IS WE HAVE DONE THE WHOLE PROJECT WITH OUR OWN HANDS (WITH A FEW EXCEPTIONS) IN THE WORKSHOP TECHNOLOGY DEPARTMENT OF COLLEGE OF E&ME,SO IT COSTS US APPROXIMATELY RUPEES TWO THOUSAND (2000) ONLY.

19THANK YOU !

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