MICROFICHE REFERENCE LIBFUUW - Cd3wd.com
MICROFICHE REFERENCE LIBFUUW - Cd3wd.com MICROFICHE REFERENCE LIBFUUW - Cd3wd.com
The semi-rotary pump, shown in Figure 3.28, is a half-bread devicewhich utilizes both rotary and reciprocating motions. A vane, very similarto the bucket-piston (i.e., with flap valve(s)) is rotated through anarc in a circular casing which also contains a check valve(s) fixed to thecasing . As the vane is alternately rotated in opposite directions, eachset of fixed- and vane-check valves suctions and discharges a unit of water.To avoid wasting energy, most semi-rotary pumps are double-acting, asin Figure 3.28, and several such pumps may be attached to the same drivingshaft. This pump is usually limited to small-capacity, domestic applicationsand is normallyoperated by manual power.3.4 Miscellaneous MethodsAs previously mentioned, a few water lifting methods exist which donot fit, either individually or collectively, into any of the establishedclasses. However, since they exhibit primarily positive displacementcharacteristics, they are appropriately considered in this chapter.3.4.1 Hydraulic RamWhen a pumping site is available which has an excess water supplywith sufficient potential energy (i.e., elevation head), the hydraulicram can be used to make water power lift water. As illustrated in Figure3.29, the ram utilizes a flow of water from a source above it to drive asmaller discharge of water to an elevation above the source. In Figure3.29, water flows down the drive pipe, into the ram and out the wastevalve until the water velocity is sufficient to provide enough momentum toclose the waste valve. The water is then forced through the check-valveand into the air chamber. This rush of water continues into the chamber
92(a)AIRCHAMBERAIR FEEDERVALVEWASTEVALVECHECKVALVERETURNSPRING \\ fDISCHARGEPIPE(b)Figure 3.29 (a) Installation, and (b) typical designof hydraulic ram
- Page 47 and 48: 40Table 3.1Shadouf performanceLift
- Page 49 and 50: (b)Figure 3.5 Scoop (a) used as sho
- Page 51 and 52: ‘PIVOT-r- ----hFigure 3.6 Wzcer b
- Page 53 and 54: 46water. The capacity of this devic
- Page 55 and 56: - =7?=PIVOTCOUNTER WEIGHT\FLAP- VAL
- Page 57 and 58: 50(a)ROLLER 7- HAND RAIL/SIDE - BY-
- Page 59 and 60: 52flow in through a check-valve (e.
- Page 61 and 62: 54exhaust valves for the steam (or
- Page 63 and 64: 56Another significant difference be
- Page 65 and 66: 58shaft), two other forms of these
- Page 67 and 68: 60Among the simplest designs for a
- Page 69 and 70: 62/HANDLEBARDISCHARGEHOSEfFOOTRE$TD
- Page 71 and 72: HANDLE/CONNECTINGARMDISCHARGEFLAP V
- Page 73 and 74: 663.3.1 WheelAfter many of the earl
- Page 75 and 76: 68Table 3.2 Manually-operated paddl
- Page 77 and 78: 70engine (2-3 hp) as the prime move
- Page 79 and 80: 72Table 3.3 records some of the per
- Page 81 and 82: 74Several names which are also appl
- Page 83 and 84: 76Table 3.5Zawafa performanceLiftDi
- Page 85 and 86: 78noria and the discharge and head
- Page 87 and 88: 80enclosed circumference can also b
- Page 89 and 90: 82Most early tympanums were of the
- Page 91 and 92: 84Table 3.6Tympanum performanceDiam
- Page 93 and 94: 86sufficiently compact and lightwei
- Page 95 and 96: 88of 3000 gpm or 5000 psig. Dependi
- Page 97: SE;vlI - ROTARYBUCKET VANEU’C)Fig
- Page 101 and 102: 94Table 3.8Ram performanceA. Typica
- Page 103 and 104: COMPRESSEDAIRDEAofpctI5LT1EDUCTC II
- Page 105 and 106: 98FLASHTANK .iJI 10 -NON-RETURNVALV
- Page 107 and 108: Because the components are not yet
- Page 109 and 110: 102air-lift pumps. The oscillation
- Page 111 and 112: 104and from the impeller and confin
- Page 113 and 114: 106making this type pump useful for
- Page 115 and 116: 90s; 80iTi!g 700E 60W50SPECIFIC SPE
- Page 117 and 118: 110to lubricate all or some of thei
- Page 119 and 120: 112such variables as impeller size,
- Page 121 and 122: 114GEAR HEADOR IVE SHAFTTO PRIME MO
- Page 123 and 124: 116W(clFigure 4.6 (a) Thai-style ou
- Page 125 and 126: 118DRIVINGSUCTIONDIFFUSERa- - =tQ,E
- Page 127 and 128: DISCHARGELINE OISCHARGE RETURNLINEL
- Page 129 and 130: -122which at $.20/kg, cost $6.00. H
- Page 131 and 132: Table 5.1Manual power appl icat i a
- Page 133 and 134: 126water lifting device. Animals ar
- Page 135 and 136: 1285.4.1 WindWindmills are currentl
- Page 137 and 138: 130even saw use on the windy plains
- Page 139 and 140: 172HAL F CYLINDERSt------TO WATER L
- Page 141 and 142: 135a vertical shaft, the wind will
- Page 143 and 144: --Table 5.3 Typical winchnil 1 clpp
- Page 145 and 146: Table 5.4 Typical watermill applica
- Page 147 and 148: 141MEDIUM BREASTFigure 5.6 (a) Medi
92(a)AIRCHAMBERAIR FEEDERVALVEWASTEVALVECHECKVALVERETURNSPRING \\ fDISCHARGEPIPE(b)Figure 3.29 (a) Installation, and (b) typical designof hydraulic ram
Change language