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Dołączył: 29 Paź 2010
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 Wysłany: Czw 10:22, 30 Gru 2010 Temat postu: ecco shoes outlet Boiler feed pump failure reasons |
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Boiler feed pump failure reasons and improvement measures
End of the roller bearings. After the last stage impeller with balance disc to adjust the axial force. Boiler feed water pump coupling for Japan EAGLE production model BENDZX; motor for Japan HITACHILTD production model TFA; voltage 6kV, Current 97.4A, the motor bearings at both ends of the back bearing for the horizontal subdivision, near the motor one end of the set with babbitt thrust surface, when the motor is channeling (about 7.0mm) center, the bearing from the medial and lateral distance should be the axis of the shoulder is 3.5mm, for the constant bearing lubrication oil. Seal with packing seal form. 1 accident process at 17:00 on October 3, 1999, A front-end pump motor bearing temperature suddenly began to rise above the normal operating temperature of 65 ℃. At 11:00 on the 4th to the alarm value of 80 ℃, the temporary use of water, ventilation and cooling measures. But still not fundamentally solve the problem, once the temperature reaches the value chain (85 ℃) will cause the device Bump. 2 Analysis of the face of it to power down the spindle motor ran down to check that: ① the motor inside the front babbit bearing thrust surface wear of about 1.6mm, the outside of the back-end bearing wear a non-alloy face. 2mm, wear black face overheating; ② shock Clearance 6.9mm, pump Clearance 2.61mm, are in the range of technical requirements; ③ back wheel of the new signs have been pulled out, the measured was pulled out about 2mm. Years, according to the boiler feed pump operation,[link widoczny dla zalogowanych], use their experience to see that this increase is different from bush, promoters have deviated from the motor to run the magnetic field lines, the value of the normal bearing vibration noise-free, oil level indication in place, as follows: ① back wheel and The rotor is fit,[link widoczny dla zalogowanych], in recent years have failed to replace the running back wheel. Long-term amount of interference is not restored, it will lose some interference power. ② the moment every time you start the motor, before and after channeling a large amount. And can not quickly stabilized. Motor magnetic center line back Offset,[link widoczny dla zalogowanych], the force passed to the pump by the side of the rotor on the back wheel, resulting in the pull out, when the current volatility, too, is there such a situation forces the rotor also kept traverse could have a massive impact on tension, the two forces in opposite directions, the role of a huge period of time, the back wheel out from the shaft. Under the above three reasons, occurs when the motor ran, the boiler feed pump in the balance disc under the effect of preventing the motor ran to the back focal point rally round, resulting in between the motor and pump back wheel is loose,[link widoczny dla zalogowanych], After a period of operation, the loose volume increases, the motor mover will be pushed back away from the magnetic field lines running wheel, the motor thrust pad into contact work, the level of the motor bearing is split ball back bearing, constant oil lubrication, not mandatory cycle, resulting in accumulation of oil in the heat, temperature, an alarm value, such as no measures are taken, and soon there will be interlocked. 3 treatment and preventive measures ① clean bearing box, replace the bearing, the old tile inlay Babbit and scratch repair. High-speed shaft, the motor shaft position, leaving 018mm of sand axial balance of the front gap, the motor and pump on the working position, high-speed coupling to open blocked. ② symmetrical position in the back round an increase of 4 M8 top wire, and coated with Loctite 609 adhesive, to increase the amount of interference with and prevent the recurrence of the phenomenon of pulling off. ③ In the back wheel shaft and the outside to make a mark with the daily inspection, check the axial position of the spindle motor, spindle deviation from the magnetic center line if more should be immediately down to check. ④ In the open, to be repeated during the open parking, stop the pump, the axial displacement should be strengthened, oil temperature, oil quality inspection, identify problems and timely solutions. ⑤ stable operating conditions, to avoid the current fluctuations, reduce open downtime. 4 summary of processed run the day again turn the motor (A), running in good condition, bearing temperature has been between the 6O ~ 63 ℃, the motor does not change the magnetic field lines,[link widoczny dla zalogowanych], through the maintenance and treatment, boiler feed pumps for the future to determine Motor bearing temperature and accumulated experience, but also can refer to other motor pump bearing temperature to judge. Received Date: 200O-02-15 @
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