The lubrication of rolling bearing of stainless steel centrifugal pump is
mainly to reduce friction power consumption and wear rate. At the same time, it
also plays an important role in cooling, dust prevention, rust prevention,
vibration reduction and other aspects. Good lubrication of equipment is the
guarantee of normal operation of equipment. Take effective measures to reduce
equipment wear, prevent equipment accidents, reduce power consumption, and
extend maintenance cycle and service life.
The roller bearing of this pump is
lubricated by 30 × in winter or 40 × in summer. Due to design reasons, dynamic
seal leakage is very serious, which not only causes a lot of oil waste, burning
bearings, but also pollutes the environment, which is not conducive to the safe
operation and civilized production of the equipment. In the course of several
years' work, many small changes have been made to solve this problem.
1、 The
process of changing lubrication mode
[felt seal to single layer framework oil
seal]
The original bearing box is sealed with felt. The oil leakage is very
serious. Each pump consumes about 300 kg of oil, causing a large amount of oil
waste and thick oil layer on the ground.
In order to change the oil leakage,
change the felt seal to the skeleton seal as follows:
1. The bearing box and
outer end cover are processed and manufactured with Φ 65 mm deep 12 mm round
holes, which are suitable for 45 mm × 60 mm × 12 mm skeleton oil seal.
Remove
the felt, tap the framework oil seal gently with a hammer, and install it
correctly.
After the transformation, the equipment operates normally, the
vibration displacement is about 0.04mm, the external temperature of the bearing
is about 50 ℃, and the annual oil consumption of each pump is only about 50kg.
The pump room is kept clean and sanitary, the occurrence of bearing and shaft
damage accidents is eliminated, and the equipment is in good operation
condition.
[single skeleton oil seal to double skeleton oil seal]
In order
to reduce the leakage, according to the structure of the end cover of the
bearing box, a modification scheme is proposed, and the inner hole of the end
cover of the bearing box is processed into a Φ 65 mm through hole. Change
single-layer framework oil seal to Double-layer framework oil seal:
The test
results show that this method can effectively prevent oil leakage in a short
time. However, after six months of continuous operation, the wear of the
skeleton oil seal will increase the leakage.
2、 Frame oil seal
defect
Change the felt seal to the framework oil seal and use 4a. Although
the effect is good, there are obvious defects.
In actual work, due to the
relatively short service life of skeleton oil seal, it is necessary to replace
skeleton oil seal. When replacing skeleton oil seal, on the one hand, all
equipment shall be disassembled, on the one hand, the labor intensity of workers
shall be increased, on the other hand, in the process of equipment disassembly
and maintenance, sometimes it will cause damage to impeller, bearing and other
parts, which does not meet the requirements of equipment economic management,
but if there is no oil Sealing, not only is not conducive to sealing, but also
directly affects bearing life. The practice shows that the framework oil seal
does not completely solve the problem of oil leakage in the bearing box of this
structure.
3、 Grease instead of oil
At present, there is no cheap and leak
free sealing device, some of which have good sealing effect, but they are
expensive and economically feasible. After investigation and study, it is
decided to test boldly and use lubricating grease instead of lubricating oil for
lubrication.
[transformation method]
Considering that the power of the
pump shaft is 18.5kw, the flow is only 200m ~ 3 · h, the pump speed is 1450 R /
min, and the linear speed is 3.4m/s, it is feasible to lubricate with grease
from the above two points.
[the specific method is as follows]
(1) Remove
the oil from the tank and clean the bearing housing.
(2) Plug the end covers
and drain holes at both ends of the bearing box to remove the air in the
box.
(3) Use a grease gun to inject lithium grease into the bearing box from
the oil filling hole, extrude the grease from the covers and drain holes at both
ends as filling, and fasten the end covers of the bearing and the wire plugs of
the drain holes. Use the handwheel to distribute the grease evenly in the
box.
After starting the pump, open the outlet valve to make the pump operate
under normal conditions, and monitor the bearing temperature and oil quality at
both ends of the pump.
The lubricating grease has good quality, no change,
and the pump operates normally. It can be seen from the temperature monitoring
data and vibration monitoring data that it is feasible to replace lubricating
oil with lubricating grease, which can be widely used in similar
pumps.
[grease lubrication effect]
The grease is not easy to leak, is
conducive to the lubrication of pump bearings, ensures the safe and stable
operation of the pump, and greatly reduces the number of refueling and
refueling. It not only saves fuel, but also reduces the labor intensity of
workers. Specifically:
(1) Save on oil costs. Each pump consumes 9 kg / A,
the cost is 63 yuan / A, the oil consumption is good, the skeleton oil seal is
4kg / A, the cost is 200 yuan / A, each pump can save 137 yuan / A, greatly
reducing the lubrication cost.
(2) Reduce maintenance costs. The average life
of framework oil seal is 4 months. In order to replace the framework oil seal,
it needs to be disassembled and overhauled about three times a year, and
replaced with lithium-based grease to reduce the labor cost. Cost of materials
and machinery to avoid damage to equipment parts during maintenance.
(3) The
operation cycle of the equipment is prolonged. From vibration. The monitoring of
temperature and other aspects shows that the use of lubricating grease has good
sealing performance, the bearing runs well, and the service life of the bearing
is prolonged.
(4) Improved the post environment.
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