First, the preparation instructions The procedures with reference to the manufacturer's maintenance and repair instructions based on the actual situation with some changes. Second, the overhaul period and overhaul (a) Overhaul cycle: Overhaul minor overhaul Overhaul cycle (month) 2 ~ 4 18 ~ 24 (b) Overhaul content: 1, Minor repair (1) Replacement packing or overhaul mechanical seal; Check the bearings, adjust the gap between the various parts and the correct coupling; (3) tighten the various parts of the bolt to eliminate defects and leakage occurred during operation, replacement of parts; (4) Check the amount of axial rotor movement; 2, overhaul: (1) Including the minor repair content; (2) Check and adjust the clearance of each part and the runout of the radial runout of the rotor, the bending of the pump shaft; (3) ) Check the repair balance disc and the balance ring end face contact, and the gap, the impeller wheel shell, bushings, balance disc shell, shoulder, tighten the nut end surface contact; (4) check the repair sleeve; ) Clean, overhaul the inlet filter, check valve and operating system valves; (6) check and adjust the level of the pump body; (7) coupling N; (8) check the pressure gauge. Third, the maintenance methods and quality standards: (A) pump gorgeous: 1, the pump base and the surface should be closely linked; 2, the axial expansion of the sliding pin pump, slide pin and pin slot should be smooth and burr; 3, the pump Section should be no cracks, stomata or severe trachoma, mouth surface should be no burrs and collision deformation, requiring the contact surface to reach more than 75%; 4, the total assembly bolts, should be symmetrical, and forced to be uniform. (B) the guide vane and the mouth ring: 1, the guide vane circulation should be smooth, with the guide vane and the mouth ring should not have serious through-hole, cavitation and other defects; 2, the mouth ring and guide vane with the use of D / ge; 3, the vane ring ring and the impeller ring ring radial clearance as shown in the following table 1: Vane ring ring diameter radial clearance 80 ~ 120 0.24 ~ 0.40 120 ~ 180 0.40 ~ 0.60 180 ~ 260 0.50 ~ 0.70 260 ~ 360 0.60 ~ 0.80 (C) pump shaft 1, spindle column and ovality shall not be greater than shaft diameter 1/2000, but the maximum shall not exceed 0.03mm, no scars on the surface, the finish of not less than 6; 2 Radial runout of coupling and shaft sections shall not be greater than those specified in the following Table 2 on the basis of two journal cylindrical surfaces: Radial runout 18 to 50 0.03 50 to 120 0.04 120 to 260 0.05 260 to 500 0.06 3, Keyway Centerline axis of the asymmetry of not more than 0.03mm / mm. (D) impeller 1, impeller mouth ring, the radial runout of the wheel shell is not greater than the provisions of Table 2. 2, the impeller beating is not more than the end face of the following Table 3 provides: diameter end runout (not perpendicularity) 10 ~ 25 0.016 25 ~ 60 0.025 60 ~ 160 0.04 160 ~ 400 0.06 400 ~ 1000 0.1 3, the hub keyway and balancing plate, Axis at the keyway centerline asymmetry of not more than 0.03mm / mm. 4, replacement of the new impeller, it is necessary to check the static balance. Static balance tolerance see Table 4: Impeller outer diameter (mm) Static balance tolerance <200 3k.cm 201 ~ 300 5k.cm 301 ~ 400 8k.cm 401 ~ 500 10k.cm 5, the impeller static method Balance, but cut to a thickness of not more than 1/3 of the wall thickness. (E) rotor and rotor pre-installed: 1, impeller, balance disc with the shaft with the use of D / gd with; 2, the shaft coupling with D / gd with; 3, sleeve, spacer and shaft can not Use the same material, so as not to kill. Sleeve, spacer sleeve on both ends of the axis of non-perpendicularity is not greater than the provisions of Table 3. 4, the key and the keyway should be fully closed, no additional gaskets, keys and shaft keyway with the tightness of the following table 5, key top clearance of 0.1 ~ 0.4mm. Spigot 40 ~ 70 70 ~ 110 110 ~ 230 Keyway with tightness 0.009 ~ 0.012 0.011 ~ 0.015 0.012 ~ 0.017 5, the rotor pre-installed measuring impeller mouth ring path runout is not greater than the provisions of Table 6 below. Impeller Orifice diameter <50 51 ~ 120 121 ~ 260 Radial runout at impeller mouth ring 0.06 0.08 0.09 0.10 6. Radial runout of sleeve, spacer sleeve, impeller wheel and balance disc shell is not greater than the following table 7 provides: Diameter ≤50 51 ~ 120 121 ~ 260 261 ~ 500 Bushing, spacer sleeve, impeller balance disc radial runout 0.03 0.04 0.05 0.06 7, balance disc end surface runout is not greater than the following Table 8 provides: Diameter 50 ~ 120 121 ~ 260 261 ~ 500 Balancing plate end beat 0.04 0.05 0.06 (B) Balance plate device: 1, balancing plate and balance ring end surface contact should be good, the contact area of ​​75% or more; 2, balance plate and balance ring radial gap of 0.4 ~ 0.8mm; 3, balance disc axial positioning should make impeller and guide vane center of the knot is positive. (7) bearing parts: 1, sliding bearings: (1) the bearing pad and the gap between the bearing is 0.02 ~ 0.04mm, the bottom tile back contact with the tile should be uniform, the contact area of ​​more than 60% 2) The bearing alloy should be free of cracks and shelling; (3) The contact angle between the journal and the lower tile should be 60 ° ~ 90 °, the contact area should be uniform, and the color printing should not be less than 2 ~ 3 points per square centimeter; ) The top clearance of the bearing bush is generally about 2/100 of the journal diameter, but the minimum is not less than 0.01mm; 2, Rolling bearing: (1) When the inner diameter of rolling bearing (radial ball bearing and radial thrust bearing) is less than 100mm, (2) Rolling bearings (radial ball bearings and radial thrust bearings), with the shell with the use of Gc / d; (3) Roller bearing axial positioning size, take the pump assembly after the total amount of rotor half of the amount of movement; (4) Rolling bearing assembly and disassembly using special tools, the use of hot equipment, the oil heated to 100 ~ 120 ℃, Scroll Bearing roller and slide surface should be non-corrosive, pits and punches; (6) radial thrust bearing and bearing cap clearance for the 0.10mm; 3, bearing: (1) bearing cradles shall not be cracked And leakage phenomenon; (2) comb-type bearing oil clearance is 0.15 ~ 0.25mm. (8) Shaft seal: 1, packing seal: (1) gland and sleeve radial clearance of 0.75 ~ 1.00mm; (2) capping tightness appropriate, not to install skew or friction with the shaft. 2, the mechanical seal: (1) the surface finish of contact with the seal ring is not less than 6; (2) the root end of the stationary ring of the gland is anti-rotation groove root and anti-rotation pin should be retained with axial 1 ~ 2mm Clearance to prevent pressure not tight seal and cramp. 3, sealed cooling device: (1) the shaft seal of the cooling water chamber should be free of cracks, leakage phenomenon, not due to scaling, rust and other blocked circulation, external cooling water system should also be smooth; (2) mechanical seal Direct cooling flush system, must be equipped with filters, filters should be intact. (Ix) coupling 1, elastic cylindrical pin coupling pin hole center deviation shall not exceed 0.10mm. 2, elastic cylindrical pin coupling rubber ring or leather ring and pin hole diameter gap of 0.5 ~ 1mm, with the cylindrical pin should be with a certain degree of tightness ; 3, the coupling of the See Table 9, the provisions of the following: Allowable number of allowable value of rotation Fixed elastic cylindrical pin type radial / radial runout Beam runout Beat surface beat ≥3000 0.03 0.02 0.05 0.03 <3000 0.04 0.03 0.06 0.04 <1500 0.06 0.04 0.08 0.06 4. The requirements for the clearance of the end face of the coupling are shown in the following table 10: The outer diameter of the coupling End clearance 90 ~ 120 2 ~ 3mm 120 ~ 220 4 ~ 6mm 220 ~ 300 5 ~ 6
