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1 PRINCIPLE & CONSTRUCTION OF HYDRAULIC PUMPS. 2 HYDRAULIC PUMPS  PRINCIPLE  CHARACTERISTICS  TYPES OF PUMPS  COMPARISON OF PUMPS  TROUBLE SHOOTING.

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Presentation on theme: "1 PRINCIPLE & CONSTRUCTION OF HYDRAULIC PUMPS. 2 HYDRAULIC PUMPS  PRINCIPLE  CHARACTERISTICS  TYPES OF PUMPS  COMPARISON OF PUMPS  TROUBLE SHOOTING."— Presentation transcript:

1 1 PRINCIPLE & CONSTRUCTION OF HYDRAULIC PUMPS

2 2 HYDRAULIC PUMPS  PRINCIPLE  CHARACTERISTICS  TYPES OF PUMPS  COMPARISON OF PUMPS  TROUBLE SHOOTING

3 3 PUMP - PRINCIPLE THE PRINCIPLE OF A HYDRAULIC PUMP IS TO CONVERT MECHANICAL ENERGY INTO HYDRAULIC ENERGY. THIS IS ACHIEVED BY GENERATING AN INCREASED VOLUME DURING INTAKE AND DECREASED VOLUME ON THE DELIVERY SIDE.

4 4 PUMP - PRINCIPLE Contd. ATMOSPHERIC PRESSURE VACUUM IS CREATED PISTON MOVES OUT EXPANDING THE SPACE IN PUMPING CHAMBER

5 5 PUMP CHARACTERISTICS FLOW RATING PRESSURE RATING VOLUMETRIC EFFICIENCY NOISE LEVEL CONTAMINATION LEVEL ALLOWED

6 6 TYPES OF PUMPS NON POSITIVE DISPLACEMENT PUMPS GEAR PUMPVANE PUMP ROTARY AXIAL PISTON PUMP RADIAL PISTON PUMP RECIPROCATORY POSITIVE DISPLACEMENT PUMPS

7 7 NON POSITIVE DISPLACEMENT PUMPS INLET EYE IMPELLER BLADES OUTLET DIFFUSER IMPELLER PROPELLER INLET AXIAL (PROPELLER ) TYPE CENTRIFUGAL ( IMPELLER ) TYPES

8 8 SINGLE VANE PUMP

9 9 DISCHARGE PORT SIDE PLATE SHAFT SUCTION PORT BOLT PRESSURE PLATE SUCTION ROTOR DELIVERY CAM RING VANE Graphical Symbol

10 10 CARTRIDGE PRESSURE PLATE SIDE PLATE CAM RING LOCATING PIN BOLT

11 11 VARIATION IN VANE PUMP DISPLACEMENT CAMRING ROTOR “THROW”WIDTH

12 12 BALANCED VANE PUMP INLET OUTLET INLET DRIVE SHAFT ROTOR OUTLET VANE CAMRING ROTATION OUTLET INLET ROTATION

13 13 VANE PUMP - TYPICAL PUMP CHARACTERISTICS Pressure Kgf / Cm 2

14 14 VANE PUMP - TYPICAL PUMP CHARACTERISTICS 1200 r/min 1000 r/min 03514021017510570 Noise Level 60 55 50 45 65 dB(A) Pressure PV2R2-41 Kgf / Cm 2 Noise Level [One metre (3.3 ft.) horizontally away from pump head cover] NOISE LEVEL

15 15 DOUBLE VANE PUMP DELIVERY SUCTION DELIVERY CARTRIDGE - 1CARTRIDGE - 2 Graphic Symbol

16 16 EXTERNAL GEAR PUMP INLET OUTLET DRIVE GEAR DRIVEN GEAR

17 17 EXTERNAL GEAR PUMP INLET OUTLET

18 18 LOBE PUMP

19 19 INTERNAL GEAR PUMP

20 20 SINGLE PUMPS DISCHARGE PORT ROTOR PRESSURE PLATE SUCTION PORT SIDE PLATE WAVE WASHER SHAFT CAM RING VANE PROPORTIONAL PRESSURE REDUCING VALVE Graphical Symbol

21 21 VARIABLE DISPLACEMENT VANE PUMPS SIDE PLATEPORT PLATE ROTOR-SHAFT FLOW ADJ. SCREW RINGTHRUST BLOCK PRESSURE ADJ. SCREW GOVERNOR PISTON DISCHARGE PORT SUCTION PORT DRAIN PORT Graphical Symbol

22 22 VARIABLE DISPLACEMENT VANE PUMPS F p = Force Acting on Camring due to System Pressure F S = Force due to Spring. F t = Force acting on Thrust Block. F p ` = Force acting on Shaft Bearing. VOLUME ADJUSTMENT SCREW PRESSURE ADJUSTMENT SCREW e ECCENTRICITY OF RING Characteristics Change in set Pressure P Q P Q Eccentricity ( Max. ) Change in set Volume Q L

23 23 VARIABLE DISPLACEMENT PISTON PUMPS SHAFT YOKE SWASH PLATE PIVOT CONTROL PISTON DRAIN PORT SPOOL FLOW ADJ. SCREW DISCHARGE PORT SUCTION PORT PISTON ASSEMBLY PRESSURE ADJ. SCREW FILLING PORT PLUG CYLINDER BLOCK Graphical Symbol

24 24 CYLINDER BLOCK ASSEMBLY PIVOT WASHER SLIPPER RETAINER CYLINDER BLOCK WASHER SPRING WASHER RETAINING RING PISTON ASSEMBLY PIN (3 pcs.)

25 25 CYLINDER BLOCK ASSEMBLY PORT PLATE

26 26 VARIABLE DISPLACEMENT PISTON PUMPS ( AT FULL CUT - OFF ). PRESSURE COMPENSATOR TYPE

27 27 VARIABLE DISPLACEMENT PISTON PUMPS PRESSURE COMPENSATOR CONTROL SPOOL PRESSURE ADJUSTMENT SCREW DELIVERY ADJUSTMENT SCREW YOKE INLET OUTLET Suction Cycle Discharge Cycle OPERATING PISTON Section A-A IN OUT

28 28 VARIABLE DISPLACEMENT PISTON PUMPS PRESSURE COMPENSATOR CONTROL IN OUT OPERATING PISTON INLET OUTLET Suction Cycle Discharge Cycle Section A-A A A

29 29 VARIATION IN PUMP DISPLACEMENT MAXIMUM SWASH PLATE ANGLE ( MAXIMUM DISPLACEMENT ) DECREASED SWASH PLATE ANGLE ( PARTIAL DISPLACEMENT ) ZERO SWASH PLATE ANGLE ( ZERO DISPLACEMENT ) STROKE LENGTH NO STROKE

30 30 SWASH PLATE CAUSES PISTON TO RECIPROCATE DRIVE SHAFT SWASH PLATE SHOE PLATE PISTON SUB-ASSEMBLY CYLINDER BLOCK BORE VALVE PLATE SLOT INLET PORT OUTLET PORT

31 31 VARIABLE DISPLACEMENT PISTON PUMP - TYPICAL CHARACTERISTICS Efficiency 100 80 60 kW 8 6 4 2 0 HP 12 10 4 2 0 6 8 Input Power % N=1500 r/min 30 10 0 20 Output Flow L/min 0 40 80120160 Pressure Input Power Output Flow Volumetric Efficiency Overall Efficiency Performance Characteristic Curve Kgf/Cm 2

32 32 VARIABLE DISPLACEMENT PISTON PUMP - TYPICAL CHARACTERISTICS 08040160120 Full Cut-off Pressure Full Cut-off Power kW 2.0 1.5 0 1.0 HP 1.5 0 0.5 1.0 0.5 1500 r/min 1800 r/min Full Cut-off Power Kg / Cm 2

33 33 VARIABLE DISPLACEMENT PISTON PUMP - TYPICAL CHARACTERISTICS Drain Noise Level [One metre (3.3 ft.) horizontally away from pump head cover] 1.5 0 0.5 1.0 2.0 0 80 40160120 Pressure Full Cut-off Full Flow N=1800 r/min N=1500 r/min 1500,1800 r/min Drain L/min Kgf / Cm 2 Full Cut-off Full Flow Pressure 08040160120 dB(A) 80 50 60 70 40 Noise Level N=1500 r/min Kgf / Cm 2

34 34 BENT AXIS PISTON PUMP PISTON PISTON ROD UNIVERSAL LINK CYLINDER BLOCK FROM INLET TO OUTLET

35 35 COMPARISON OF HYDRAULIC PUMPS TYPEVANE PUMPGEAR PUMPPISTON PUMP Working Principle Varying Volume between the Vane & Camring Shifting Volume surrounded by gear grooves & casing. Varying Volume by reciprocating Pistons. Average Efficiency HighLow except for pressure loading type. Highest among three types. Wear & Efficiency Does not decrease since wearing of camring or vane can be compensated Decreases with Wear Decreases with Wear

36 36 COMPARISON OF HYDRAULIC PUMPS

37 37 COMPARISON OF HYDRAULIC PUMPS

38 38 COMPARISON OF HYDRAULIC PUMPS

39 39 COMPARISON OF HYDRAULIC PUMPS 700 ~ 180080 ~ 92

40 40 TROUBLE SHOOTING


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