Pumping unit maintenance of the technical requirements

Pump unit maintenance of the technical requirements of various components:

1, spindle part:

1) journal taper and ovality is not greater than the shaft diameter of 1/0. However, the maximum shall not exceed 0.05mm, and no scratches the surface, requiring surface roughness? 3.2.

2) Shaft bending over the allowable value can be mechanical or heating method straightening. Allowable bending of the shaft is shown in the following table (unit: mm). Shaft diameter at the center of the shaft (1500 rev / min) Shaft center (3000 rev / min) Multistage shaft ≤ 0.02 ≤ 0.10 ≤ 0.08 ≤ 0.05 3) The key and the keyway should be close together, not allowed to add shims, keys and shaft Keyway tightening force is shown in the following table (unit: mm). Shaft diameter 40-70-230 Key width Tight 0.009-0.012 0.011-0.015 0.012-0.017

2, the rotor part:

1) Rotor's rocking degree shall not exceed the following table (unit: mm).

Part of the radial rocking axial rocking Shaft sleeve ring ring impeller balance disk shaking ≤ 0.02 ≤ 0.05 0.08-0.12 <0.25 <0.03

2) Sleeve:

(1) sleeve and shaft can not use the same material. In particular can not use the same kind of stainless steel.

(2) The mechanical seal sleeve in the non-corrosive medium, optional 25 steel chrome plated, filler seal sleeve surface should be hardfacing carbide, hardness Rc50-60.

(3) sleeve end face of the axis of non-perpendicularity shall not exceed 0.01mm.

(4) Sleeve and shaft contact surface roughness should not be less than? 1.6, using D / d with.

3) balance plate: Balance plate and shaft with D / gd with.

4) Impeller:

(1) impeller on the shaft with the general use of D / gd with.

(2) new impeller should find a static balance, if necessary, find a balance. Rotor components must be subject to a balancing test at the factory. The remaining unbalance allowed on the outside diameter of the impeller during quiescent equilibrium should not be greater than the allowable limit of static balance of the static balance at 3000 r / min.

Impeller outer diameter (mm) Static balance on the maximum diameter of the impeller Tolerance (g) ≤3 201-300 5 301-400 8 401-500 20

(3) The impeller should be balanced by the method of removing weight, but the thickness of cut should not be more than 1/3 of the wall thickness.

(4) Impeller without trachoma, perforation, cracks or wall thickness due to red severely underwriting warranty.

(5) impeller and shaft with the key top should be 0.2-0.4mm gap.

5) After the assembly of the rotor and the stator, first determine the total axial channeling amount of the rotor. The center of the rotor should be taken as half of the total channeling amount.

3, bearing parts:

1) plain bearings:

(1) The bearing bush and bearing cover should be 0.02-0.04mm. The contact between the bottom tile and the tile base should be uniform and the contact area should reach 60% -80%. The tile backing should not be padded.

(2) The contact angle between the journal and the lower tile should be 60-90 °. The contact area should be uniform, and the stains shall not be less than 2-3 points per square centimeter.

(3) The clearance of the top of the bearing pad shall conform to the following table (unit: mm). Shaft Diameter Clearance 1500 r / min or less 1500 r / min or more 30-50 0.075-0.160 0.17-0.34 50-80 0.095-0.195 0.20-0.40 80-120 0.120-0.235 0.23-0.46 120-180 0.150-0.285 0.26-0.53 180- 0.180 -0.330 0.30-0.60 (4) Tungsten layer and the tile shell should be combined well, without cracks, trachoma, peeling, slag and other defects.

2) Rolling bearings:

(1) Inner race and shaft fit as shown in the following table (unit: mm). Shaft diameter with the amount of surplus Shaft diameter with Earnings 18-30 0.002-0.027 80-120 0.003-0.046 30-50 0.003-0.032 120-180 0.004-0.055 50-80 0.003-0.038

(2) Outer race and shaft fit in the following table (unit: mm). Shaft diameter with the amount of surplus Shaft with the amount of surplus 18-30 + 0.029 ~ -0.008 80-120 + 0.045 ~ -0.014 30-50 +0.033 ~ -0.010 120-180 +0.052 ~ -0.014 50-80 +0.038 ~ -0.012 Note: (+) indicates the gap; (-) indicates the surplus
(3) Ball, roller bearings within the gap shown in the table below (unit: mm).

Bearing Diameter Radial Clearance New Ball Bearing New Roller Bearing Maximum Allowable Wear 20 to 30 0.01 to 0.02 0.03 to 0.05 0.1 35 to 50 0.01 to 0.02 0.05 to 0.07 0.2 55 to 80 0.01 to 0.02 0.06 to 0.08 0.2 85 to 120 0.02 ~ 0.03 0.08 ~ 0.10 0.3 130 ~ 150 0.02 ~ 0.04 0.10 ~ 0.12 0.3

(4) Where axial thrust bearing with a rolling bearing pump, the outer race of the rolling bearing should not be crushed, the general should be left 0.04-0.08mm gap.

(5) Rolling bearing assembly and disassembly, the use of special tools should be used; if the best conditions for the use of hot equipment, oil heating oil temperature is about 100 ℃, non-direct flame heating.

(6) Roller bearing surface and the slide should be non-corrosive, scars and spots, smooth contact without noise.

4, sealing device:

1) Gland:

(1) Gland and sleeve diameter clearance is generally 0.75-1.00mm.

(2) The non-perpendicularity of the plane of the mechanical seal gland and the gasket contacting the centerline of the shaft is ≯0.02mm.

(3) The gap between the gland and the inner wall of the stuffing box is generally> 0.20mm.

(4) The thickness of gasket between mechanical seal gland and stuffing box should be kept at 1-3mm.

(5) gland static ring anti-rotation groove root and anti-rotation pin, should maintain an axial 1-2mm gap to prevent pressure tight seal ring and hold-up.

2) packing ring:

(1) The diameter of the packing ring and the shaft sleeve clearance is generally 1-1.5mm.

(2) The diameter of packing ring and packing box is 0.15-0.20mm.

3) Filler bottom sleeve and the diameter of the gap is generally 0.70-1.00mm.

4) The diameter of the balance sleeve and sleeve clearance is generally 0.5-1.2mm.

5) Shell mouth ring and impeller mouth ring, middle tile and the diameter of the middle sleeve gap shown in the table below (unit: mm). Orifice Diameter Case Orifice and Impeller Orifice Intermediate Tile and Intermediate Sleeve Standard Clearance Change Clearance Standard Clearance Change Clearance <100 0.40 to 0.60 1.00 0.30 to 0.40 0.80 ≥ 100 0.60 to 0.70 1.20 0.40 to 0.50 0.90

5, coupling:

1) Coupling and shaft should be used with D / gd.

2) The axial clearance between both ends of the coupling is generally 2-6mm.

3) The installation of tooth-shaped coupling should ensure that the external teeth in the middle of the tooth width.

4) When installing the elastic cylindrical pin coupling, the rubber ring and the pin should be interference fit and have a certain force. The diameter of the rubber ring and the coupling hole clearance should be 1-1.5mm.

5) Concentricity deviation of the coupling should conform to the following table (unit: mm). Type Radial Axial Tooth Profile <0.08 <0.06 Elastic Pins 0.10 0.06 Spring Plate 0.15 0.10 Stationary 0.06 0.04 6) When looking for concentricity, there should be no more than four washers under the motor.

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