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Water ring vacuum pump maintenance and maintenance methods
â‘ maintenance
a. Often observe the various instrumentation readings are normal, especially the speed and shaft power is stable.
b. Regularly compress the packing. Such as packing wear can not guarantee the seal should be promptly replaced, the packing should not be pressed too tight, under normal circumstances should be leaked from the stuffing box into a thin water column or drop-shaped, filled into the stuffing box should be full of water, water supply The pressure is (0.5 ~ 1) × 105 Pa.
c. Shaft pump temperature not higher than the surrounding temperature 30 ℃, and the absolute temperature value is not higher than 60 ℃. Rolling axis pump room pressure XZG-4 calcium-based grease to full shaft pump room space 2/3 is appropriate. Normal working shaft pump should be loaded 3 to 4 times a year, at least once a year to clean the shaft pump, replace all the lubricating grease.
d. The new pump should be checked before starting the fuel tank is sufficient, the lubrication system is reliable, the cooling water is smooth. And check the motor rotation direction is correct, hand pump pump to see if there is no fault (large pumps available intermittent start the motor method). Pump oil should also be discharged to the tank, so as to avoid sudden acceleration due to excessive resistance to damage the motor and pump. If the temperature is too low in winter, the pump should be heated before starting the pump. If the oil viscosity is high at low temperature, if the motor is suddenly started, the motor will overload and damage the pump parts.
e. Shut down the valve leading to the vacuum system when stopping, then turn off the motor and open the bleed valve to put the air into the pump to prevent the pump oil from flowing back into the pipe and the vacuum chamber before finally stopping the cooling water.
f. Pay attention to the supply of water to make up the water, the temperature of the water flowing out of the pump should not exceed 40 ℃.
9. Winter use, it should be noted that after the pump is stopped and the water in the tank to drain, so as not to freeze the device.
h. Under normal circumstances, all the pumps should be disassembled after one year's operation to check the wear and tear of the parts. However, the length of overhaul period may also be discretionary.
â‘¡ maintenance
a. overhaul
(a) Minor revision
i. Inspect and fasten all the connecting bolts.
ii. Inspect the seal and replace the packing.
iii. Check the coupling, replace the elastic rubber ring, check the coaxiality of the coupling.
iv. Check the shaft pump and replace the grease (grease).
V. clean, check the circulating pump.
(b) Intermediate and overhaul
i. Includes minor repairs.
ii. Dissolve and inspect the wear and corrosion of the parts, check or replace the parts.
iii. Check or correct shaft straightness.
iv. Check rotor sway and verify rotor static balance.
v. Replace the roller pump oil.
vi. Check and adjust the clearance between the two ends of the impeller and the front and back covers.
vii. Replace the impeller and sleeve.
Viii. Adjust the pump body level.
ix. Verify the vacuum gauge.
X. Body painting.
b. Maintenance quality requirements
(a) There shall be no cracks or large areas of blisters between the housing and the cover of the pump housing and the pump cover.
(b) SZB cantilever water ring vacuum pump spindle and impeller
i. Spindle should not have defects such as cracks.
ii. Shaft and roller pump with H7 / js6 or H7 / k6.
iii. Spindle and impeller with H7 / m6.
iv. The clearance between the two ends of the impeller and the front and back covers shall comply with the requirements in Table 4-14.
V. Straightness of the spindle should not exceed 0.2 ~ 0.4 mm / m.
Vi. The blades of the impeller should not have burrs and cracks.
Vii. Impeller should be balanced test, the requirements of the relevant technical requirements.
Viii Impeller and shaft assembly, its end surface runout should not exceed 0.1 mm.
Table 4-14 Clearance between the impeller and the front and rear covers / mm
Model
The sum of the clearance between the impeller and the front and back covers
Install the gap
Overhaul clearance
Change the gap
SZ-2
SZ-3
SZ-4
0.4
0.5
0.5
0.5
0.6
0.6
1
1
1
(c) packing seal
i. The packing gland end surface should be parallel with the packing box end surface, the degree of tightness of the fastening bolt should be uniform and uniform to avoid the pressure deviation.
li. The depth of the gland into the stuffing box is generally the height of the packing, but the minimum can not be less than 5 mm.
iii. Filler cut should be parallel, neat, not loose, incision into 30. Angle, filling material interface should be staggered l20 ℃.
iV. Filler seal allows leakage loss l 0 ~ 20 drops / rain.
(d) Rolling bearings
I. rolling bearing roller and ramp surface should be no pit scars, spots, contact surface smooth, noise-free rotation.
ii. When mounting the bearing, the rear bearing should be fixed and the front bearing (on the motor side) should have an axial direction of 0.2 to 0.3 mm
gap.
(e) Flexible couplings
i. Radial runout of the coupling halves and end face runout shall not be greater than those specified in Table 4-15.
ii. The concentricity and axial clearance of the coupling should meet the requirements of Table 4-16.
iii. There should be an interference fit between the elastic ring and the pin. The clearance between the outer ring and the pin hole should meet the requirements in Table 4-17.
Table 4-15 Radial runout of two coupling halves, face runout / mm
The maximum outer diameter of the coupling
The radial runout of the outer circle on the axis
End beating
105 ~ 170
0.07
0.16
190 ~ 260
0.08
0.18
290 ~ 350
0.09
0.20
Table 4-16 Coaxiality and axial clearance of couplings
Vacuum pump coupling maximum outer diameter
105 ~ 170
190 ~ 260
290 ~ 350
Concentricity
≤0.1 4
≤0.1 6
≤0.18
Axial clearance
2 ~ 4
2 ~ 4
4 ~ 6
Table 4-17 Clearance between Outer Ring and Pins Hole
Part of the cylindrical stud nominal diameter
10
14
18
twenty four
30
38
46
Pin hole nominal diameter
20
28
36
46
58
72
88
Elastic ring diameter
10 + 0.25
0
14 + 0.25
0
18 + 0.25
0
24 + 0.30
0
30 + 0.30
0
38 + 0.40
0
46 + 0.40
0
Elastic ring outer diameter
10 + 0.25
0
27 + 0.30
0
35 + 0.40
0
45 + 0.40
0
56.5 + 0.50
0
70.5 + 0.70
0
86.5 + 0.70
0
â‘¢ demolition
a.SZB-type vacuum pump SZB-type vacuum pump demolition, partial disassembly and complete removal. If you only check the working condition of the impeller or clean the pump chamber, just unscrew the connecting bolt between the pump body and the pump cover and remove the pump cover, which is called partial disassembly. If the pump shaft, bearings or other parts damaged need to be repaired and replaced, you need to completely remove. Disassembly order is as follows.
(a) Remove the water supply pipe, suction pipe and exhaust pipe.
(b) Remove the pump cover and remove the impeller and key.
(For example, remove the packing gland, remove the packing and packing ring.
(d). Loosen the pump body and bracket connection bolts and remove the pump body.
(e) The pump shaft and bearing are generally not required to be disassembled. If disassembly is required, first release the oil in the bearing chamber, remove the bearing cap and the coupling, and remove the shaft from the pump body.
b.SZ-type vacuum pump (see Figure 466) SZ-type pump is generally removed from the discharge end, the order is as follows (SZ-2-type, for example).
(a) Drain the pump water, remove the water supply pipe, suction pipe, exhaust pipe and water seal pipe, loosen the bottom bolt and coupling
bolt.
(b) After removing the bearing cap, tighten the bearing and lock the nut. After loosening the bearing bracket and discharge cover connecting bolts, remove the bearing bracket (together with the bearing removed). Remove the packing gland and remove the packing.
(c) Loosen the coupling lock nut and remove the coupling, key, and bearing retainer.
(d) After removing the front bearing cap, loosen the front bearing bracket and suction cap connecting bolts, remove the front bearing bracket, remove the packing gland and take out the packing.
Figure 45-6 Structure of SZ-1 and SZ-2 Vacuum Pumps
1 pump body 2 suction cap 3 discharge cap 4 impeller 5 pump shaft 6 ball bearing 7 filler 8 sleeve 9 elastic coupling
(e) Release the pump shaft and impeller by loosening the pump body, suction cap and discharge cap connection bolt and disassembling the pump body and suction cap and discharge cap.
(f) When the impeller needs to be replaced if it is damaged, the impeller can be separated from the sleeve on both sides to disassemble the impeller and the pump shaft in the axial direction. Under normal circumstances, the impeller and the pump shaft are tightly matched and do not need to be decomposed.
â‘£ SKA direct water ring vacuum pump side clearance inspection Adjust the vacuum pump shaft, bearings, impeller, packing tube and other parts of the inspection requirements and methods and centrifugal pumps, the difference is the side of the gap inspection and adjustment . Vacuum pump can not be drawn to a certain degree of vacuum and to maintain a certain amount of exhaust, in addition to strict suction system, water supply and cooling is appropriate, the speed is sufficient, mainly depends on the size of the impeller side clearance. In the process of using, due to wear and tear caused by the gap is too large, it will cause the degree of vacuum and suction decreased, serious loss of pumping capacity. However, the assembly gap is too small, will not only cause the motor overload, or even stuck.
a.SZB-type vacuum pump. The impeller can slide axially along the shaft, and automatically adjust the side end clearances on both sides during operation. So in the inspection and adjustment, as long as the impeller is pushed to the side of the shaft in the direction of the coupling, you can use pressure lead wire method between the pump cover and the impeller edge to measure the gap. In case of exceeding the regulation, under normal circumstances, the thickness of the paper pad between the pump cover and the pump body can be adjusted and adjusted until it is qualified. When the impeller side or sidewall wear more serious, only paper pad adjustment will not work, you need to revise or replace the impeller turning, but also turning the pump cover.
b.SZ water ring vacuum pump. Its structural feature is that the impeller is fixedly assembled on the shaft, and the impeller can not slide axially when the pump is working. Inspection, the general inspection of the total gap on both sides of the impeller. When checking the overall clearance, the end face of the impeller should be placed close to the discharge cap, and the lead wire should be pressed between the impeller and the cap to check the clearance. In order to ensure that the total clearance measured accurately, pressure lead wire, the shaft pump should be installed before and after. As the disassembly of the bearing is too much trouble, and sometimes only installed in the case of bearings without the front bearing pressure wire lead inspection, when the impeller end surface prone to bias, the impeller in four directions up and down around the need to put lead, and then measured The average total gap is calculated on the basis of the point gap. SZ-type vacuum pump on both sides of the total side of the gap, the pump body and the front and rear covers with pad thickness adjustment. When the clearance is too large, the impeller must be replaced or modified.
⑤ assembly sequence and adjustment SZB-type vacuum pump clearance adjustment in the end of the pass, you can press the demolition in the reverse order of assembly.
SZB-type vacuum pump in the assembly process needs to adjust the gap on both sides of the impeller the same, more trouble. SZ-1 and SZ-2-type vacuum pump assembly adjustment sequence is as follows.
a. Connect the pump body to the discharge cap and into the impeller and pump shaft before attaching the suction cap.
b. Install front and rear bearing bracket and bearing. Install the bearing lock nut on the discharge end, install the bearing lock nut (do not tighten) after installing the bearing stopper sleeve, bearing cap, key and coupling on the suction end.
c. Two-stage water ring vacuum pump with bearing lock nut and coupling lock nut to adjust the gap on both sides of the impeller. Adjustment, the first tighten the rear bearing lock nut, bearing the seat outer ring abut the bearing case, the impeller close to the discharge cover, and then slightly loose bearing lock nut, tighten the coupling nut, the impeller Move forward to about half the total gap. Adjustment process, while adjusting the two before and after the lock nut, while rotating the pump shaft, there is no scratches sound and turn flexible, is to adjust the appropriate, because the total edge of the gap was not large, as long as no scratches, indicating the gap before and after Basically equal, that is not a big difference, will not affect the pump work. This adjustment method, the front end of the gap is generally larger than the back end, the operation is still beneficial. Such as loose bearing lock nut, still can not pull the shaft, it may be the front bearing inner race has been tight with the shoulder, while the outer race is not on the bearing frame. At this time, the front axle pump can be added between the outer ring and the bearing washer and re-adjusted.
d. Install the bearing cap (must press the rear bearing outer race). Ball bearings on both sides should be equipped with grease, filled with full bearing space to 2/3 is appropriate.
e. Install the packing and packing gland on both sides.
â‘¥ test and acceptance.
a. Pre-test preparation
(a) Inspect the bolts of each department for looseness, and check if the parts, instruments and auxiliary equipment are complete.
(b) Check the bearing lubrication is good, circulating water system is unobstructed.
(c) There should be no jamming or unevenness of the car.
b. Test run 2 h should meet the following requirements:
(a) Smooth operation without noise;
(b) shaft seal leakage meet the requirements of the subsidiary pipeline should run, run, drip, leak phenomenon;
(c) Bearing temperature is not higher than 75 ℃;
(d) bearing amplitude should meet the requirements;
(e) Vacuum rating plate value;
(f) The current is stable and does not exceed the rating.
c. Acceptance Inspection quality in line with the requirements of procedures, maintenance records complete, accurate, test normal, according to the provisions of the acceptance procedures, delivery of production.
⑦ Common Faults and Solutions Common faults and solutions are shown in Table 4-18.
Table 4-18 Water ring vacuum pump common failures and treatment methods
In case of one of the following situations, emergency stop should be handled.
a. A sudden abnormal sound in the pump.
b. Circulating water suddenly interrupted.
c. Sudden severe pump vibration.
d. Other emergency stops as specified in the operating instructions.
Model
The sum of the clearance between the impeller and the front and back covers
Install the gap
Overhaul clearance
Change the gap
SZ-2
SZ-3
SZ-4
0.4
0.5
0.5
0.5
0.6
0.6
1
1
1
The maximum outer diameter of the coupling
The radial runout of the outer circle on the axis
End beating
105 ~ 170
0.07
0.16
190 ~ 260
0.08
0.18
290 ~ 350
0.09
0.20
Vacuum pump coupling maximum outer diameter
105 ~ 170
190 ~ 260
290 ~ 350
Concentricity
≤0.1 4
≤0.1 6
≤0.18
Axial clearance
2 ~ 4
2 ~ 4
4 ~ 6
Part of the cylindrical stud nominal diameter
10
14
18
twenty four
30
38
46
Pin hole nominal diameter
20
28
36
46
58
72
88
Elastic ring diameter
10 + 0.25
0
14 + 0.25
0
18 + 0.25
0
24 + 0.30
0
30 + 0.30
0
38 + 0.40
0
46 + 0.40
0
Elastic ring outer diameter
10 + 0.25
0
27 + 0.30
0
35 + 0.40
0
45 + 0.40
0
56.5 + 0.50
0
70.5 + 0.70
0
86.5 + 0.70
0