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LEWA pump 1. Pump type is similar to: 1.P-3103A/B: Horizontal triple plunger positive displacement reciprocating pump. model: G3F 2, P-3105A/B: Horizontal opposed piston diaphragm pump. model: ESB1 2. Working principle of LEWA pump: LEWA pumps are reciprocating positive displacement pumps. Volumetric flow is produced by the periodic repetition of a predetermined stroke displacement given by plunger area and stroke length. The volume and flow rate can be changed by changing the stroke length (such as P-3105A/B) or stroke frequency (such as P-3103A/B) or both. 1. The P-3103A/B pump is composed of ① combined device driver, ② pump transmission mechanism, ③ pump head (plunger) and ④ inlet and outlet valves and other accessories. The power required to increase the pressure of the fluid delivered from the inlet to the outlet is provided by the driver (motor. model: ED-Ⅱ-T3) provided. The rotation of the driver or a swing (reciprocating) motion of the plunger is converted into work through the transmission device. 1.1Plunger pump head: Φ60×494 3 material 316Ti plated NiC2 1.2 pump shell: 560×360×510 3 materials 316Ti (DW1.4571) 1.3 inlet/outlet valve: It consists of four parts: valve seat, valve disc and valve spring, and valve trim. ⑴Inlet/inlet valve seat: Φ96.5×32 6 materials: Hastelloy C ⑵Inlet/outlet valve plate: Φ52×16 6 materials Hastelloy C ⑶ Valve spring: Φ52.5×40.9 6 material Hastelloy C 1.4 transmission device: It is a single-casing three-stage transmission with an eccentric shaft supported at both ends and an internal turbine reducer. Three cams on the eccentric shaft transform into each other evenly, producing smooth operation and low pulse output. The transmission system operates according to the crankshaft crosshead principle. The rotational motion of the turbine coupled to the drive motor is directly transmitted to the eccentric shaft through the turbine (3), and the eccentric shaft drives the plunger rod through the connecting rod. ⑴Worm: Φ94.8×542 1 piece material DIN1.7131 (CrMo steel) gear transmission ratio I=9.25 ⑵ Turbine: Φ344×61 1 material DW2.1052 () gear transmission ratio I=9.25 ⑶ Eccentric shaft: Φ280×1240 1 material DW0.7040 () displacement: 00/1200/2400 ⑷Connecting rod: 531×278×50 3 piston rods: Φ110×423 3 thrusts 45KW ⑹ Transmission housing: 1205×1000×663 1 material DIN0.625 1.5 bearing: Both ends of the worm are supported by bearings: ⑴The front bearing (drive motor end) is a tapered rolling bearing, Φ355×Φ125×37 1 piece (2) The other side is a short cylindrical roller bearing, model NU211.E.M1. The bearings at both ends of 1 eccentric shaft are: ⑴Front bearing (turbine side): Tapered roller bearing, TDO 780 Φ181×105 1 (2) rear bearing: Short cylindrical roller bearing, NU2320E.M1. Φ215×73 1 piece 1.6 transmission device lubrication: 1.6.1 Lubricating oil quantity for each transmission device: 135 liters. The starting oil temperature of the transmission is: 00C The maximum temperature of the transmission is: The normal temperature of the transmission device at 700C is: -20～+500C. 1.6.2 Check the lubricating oil level once a week. The oil level should reach the scale or center of the glass tube test. After 8,000 hours of operation, replace the lubricating oil at least once every two years. 1.6.3 The oil cooler has large and small heads. The large head size is 985×165×165 and the small head size is 41×47.3×55. The material is: 1.4571 1.7 The pump and motor are connected using a flexible ROTEX coupling. 1.8 shaft seal: Use packing seal. Consists of 13 packing rings and 3 bushings, divided into 2 groups. One group is used to seal process media, and the other is used to seal oil. set of packing rings: GR.60 HS 8×8×228 material is P1.0, 9 pieces, packing gland bolts are M20. One set of packing rings: GR.60 ALΦ72×6, material is P0.2, 4 pieces, packing gland bolts are M12. The leaked liquid is led out from the 3/4″ pipe at the bottom. 1.9 The pump head is equipped with an integral heating sleeve. The steam is low pressure steam 1650C, 6bar.g 2. Process parameters of P-3103A/B pump: medium: Molten urea outlet pressure: 81bar.g pump speed: 16--159rpm plunger speed: At 159rpm, 0.47m/s(max) stroke: 90mm motor speed: 3. Working process of P-3105A/B: Driven by the drive motor, the transmission device converts the rotational motion into a swing. The transmission works on the linear thrust crankshaft principle. The worm shaft is connected to the motor and transmits the rotation directly to the eccentric through the turbine and the hollow shaft. The eccentric block rotates in the slider, and the slider is controlled in the choke frame. The choke frame and slider convert rotation into reciprocating motion of the plunger rod. The plunger stroke length is adjusted by turning the handwheel. The reciprocating plunger transmits its motion to the control push rod, which acts on the diaphragm, which acts on the metered fluid and generates the suction process. 3.1 Diaphragm pump head: Specifications are: GR.60/70 ESM511. Dimensions are: 320×690×480 material is: DW1.4571-3B 2 diaphragm pump heads are divided into three functional rooms: Operating chamber (in contact with the metered fluid), hydraulic chamber and hydraulic system tank. Diaphragm specifications: GR.70/85 HS, size 330×330×120, is a jacketed diaphragm made of PTFE. Between the hydraulic chamber and the hydraulic system tank are the plunger and control push rod, hydraulic dual-function valve (composed of pressure reducing and venting valves), hydraulic injection valve and control push rod. The function of these valves is to control the displacement of the diaphragm and prevent overloading and maloperation of the pump. The amount discharged by the diaphragm is always less than that of the plunger. The reason is that during each stroke, a small amount of hydraulic fluid is discharged from the hydraulic chamber to the hydraulic system tank through the anti-aircraft valve and plunger seal. This discharge can only be replenished through the jet valve. The function of the anti-air valve is to eliminate measurement errors caused by gas accumulation in the hydraulic chamber. It is located at the highest point of the hydraulic chamber. The hydraulic valve protects the pump from malfunction and also serves as a safety valve for the entire unit when the pump itself generates process pressure. The hydraulic injection valve opens the valve to replenish liquid from the hydraulic system tank into the hydraulic chamber when the pressure drops to a predetermined value after a vacuum is generated in the hydraulic chamber. 3.2 Inlet/outlet valve: valve seat: 440 (DIN 1.4122) Conical valve: KERF40ES size Φ87×94 valve spring: 316Ti (DIN 1.4571FH) size Φ35.6×30.8 3.3 transmission device: It is a single-shell two-cylinder opposed type. 3.3.1 Worm: Φ75.6×486 Material DIN 1.7131 Gear transmission ratio I=10.0 1 3.3.2 turbine: Φ276×46 material DIN 2.1052 gear transmission ratio I=10.0 1 3.3.3 hollow shaft: Φ180×313 material DIN 0.7040 1 3.3.4 sliding shaft: Φ90×242 material DIN 1.7131 1 3.3.5 adjustment lever: Φ57×294 material DIN 1.4021 1 3.3.6 eccentric block: Φ220×118 material DIN 0.7040 1 3.3.7 slider: 250×250×40 1 3.3.8 plunger rod: Φ106×393 2 3.3.9 guide rails: 250×250×270 2 material DIN0.6025 3.3.10 slotted plunger: Φ60×266 material DIN1.7131 3.3.11 plunger ring: GR60 material DIN 70910 size Φ60×2.5 2 3.3.12 control push rods: Specification 85D EH.EZ.ES G3F size Φ85×77 1 3.4 bearing: 3.4.1 Bearings at both ends of worm: The front and rear bearings are tapered roller bearings, size Φ55×95×30, 2 3.4.2 hollow shaft bearings at both ends: The front and rear bearings are tapered roller bearings, size Φ110×170×38, 2 3.4.3 sliding shaft axial roller bearings: Size Φ40×60×13 Two 3.5 pumps and motors adopt flexible connection ROJEX 3.6 shaft seal is the same as P-3103A/B 3.7 lubrication adopts splash oil lubrication 4. Maintenance of LEWA pump: 4.1 Loosen the oil drain plug and cock at the bottom of the transmission device and drain the oil. 4.2 Remove the pump head and remove the plunger from the plunger rod. 4.3 Remove the manual stroke adjustment and loosen the joystick. 4.4 Unscrew the hexagon socket screw and remove the dial. Push the scale ring up until the circlip is taken out 4.5 and turn the handwheel in the direction of "increase stroke" (clockwise). Until the entire manual stroke adjustment device is removed. 4.6 Remove the bearing flange. 4.7 Take out the two reeds. Move the eccentric block to the 0 position by pulling up the adjustment rod, and insert an appropriate reed in the chute of the sliding shaft. Take out the shaft, complete set of turbine and adjusting device. 4.10 Remove the hub from the worm. 4.11 Disassemble the adjusting device, take out the retaining ring, and use a wooden hammer to push out the edged screw. The adjusting rod, bearing and sliding shaft can be pulled out together. 4.13 Remove the turbine 4.14 Disassemble the inlet and outlet flanges 4.15 First remove the two hexagonal head screws and replace them with two long bolts, then remove the other hexagonal head screws and slide the diaphragm body onto the bolts 4.16 Remove the wire plug at the bottom of the oil tank and drain the hydraulic pressure Oil 4.17 Remove the hydraulic dual-function valve and hydraulic jet valve 4.18 Remove the plunger seal. For the seal with plunger ring, use a sharp tool to press it out from the groove. 4.19 Remove the control push rod and reinstall it in the reverse order. 5. Process parameters of P-3105A/B: medium: Ammonia outlet pressure: 94 bar pump speed: 142 rpm stroke: 60 mm piston speed: 0.32 m/s(max) Inlet and outlet flange: 1 1/2" 1500# RF