Single-stage single-suction centrifugal pump bearing

Home>Bearing knowledge>Single-stage single-suction centrifugal pump bearing
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131";

Single-stage single-suction centrifugal pump bearing

Source: Bearing network time: 2018-01-01

/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Abstract: IS series single-stage single-suction centrifugal pump; due to the delineation; the rolling bearing used in centrifugal pump is smooth with oil; the dynamic seal is very serious; the safety and stability of the equipment should be safe; the author has worked in several years; Repeated small reforms have achieved a certain role. But the problem of leakage has not been completely dealt with; after the theory, the oil is smooth and smooth and smooth; the effect is outstanding.
Key words: centrifugal pump, smooth, sealed, oscillating centrifugal pump The smoothness of the rolling bearing is mainly to reduce the friction power consumption; reduce the wear rate; together also play the role of cooling, dustproof, rust and vibration absorption. Equipment works normally. Reduce equipment wear and tear; avoid equipment problems; reduce power consumption; extend the repair cycle and use useful life.
The centrifugal pump used in the circulating water system of our roaster is a single-stage single-suction pump; various technical parameters are as follows:
The type is IS150-125-250; the flow rate is 200m3/h; the head is 20m; the shaft power is 18.5kw; the speed is 1450r/min.
This type of pump rolling bearing smooth is made of 30# (winter) or 40# (summer) mechanical smooth oil smooth. Due to the delineation of the dynamic seal leakage is very serious; not only the oil is formed a lot of dross; the bearing burns; and pollutes the environment; Safety work and civilized production of equipment. In the work of several years; in order to deal with this problem; repeated small reforms.
1. The process of smoothing the transformation
1.1 The felt seal is changed to a single-layer skeleton oil seal. The original bearing housing seal is sealed with felt. The leakage is very serious; the fuel consumption of each pump is about 300kg/a; a lot of oil is formed; the oil on the ground is thick.
In order to modify this oil leakage condition; change the felt seal to the skeleton seal; the method is as follows:
1 The inner and outer end caps of the bearing box are processed; the car has a round hole of Φ65mm and a depth of 12mm; a frame oil seal with a standard of 45mm×60mm×12mm is suitable.
2 Remove the felt; sneak in the skeleton oil seal with a hammer; and correct equipment.
After the transformation; the equipment works normally; the oscillation displacement is about 0. 04mm; the external temperature of the bearing is about 50 °C; the annual consumption of oil for each pump is only about 50kg. The pump room is clean and hygienic; the bearing is formed due to lack of oil. The shaft damages the attack; the equipment is working without defects.
1.2 The single-layer skeleton oil seal is changed to the double-layer skeleton oil seal in order to make the leakage amount more and more reduced; according to the layout condition of the bearing box end cover; the transformation plan is also proposed; the inner hole of the bearing box end cover is processed into the Φ65mm through hole. The layer skeleton oil seal is changed to a double layer skeleton oil seal:
The test work indicates that this method is very useful in the short-term to avoid oil leakage. However, it will work for 6 months in the future; the leakage of the skeleton oil seal will increase the leakage.
2, the shortcomings of the skeleton oil seal to change the felt oil seal to the skeleton oil seal; the use of 4a; although the effect is better; but there are also significant shortcomings.
In practice, because the life of the skeleton oil seal is short; the demand is often replaced; when replacing the skeleton oil seal; the demand collapses all the equipment; on the one hand, the labor intensity of the worker is added; on the other hand, during the equipment repair and repair process; Damage to parts such as bearings; does not meet the economic management requirements of the equipment; but if it does not change the oil seal; form a leak; it is not conducive to sealing; it also directly affects the bearing life. Totally; theoretically proved: the skeleton oil seal does not completely handle the bearing housing of this layout Oil spill problem.
3, smooth grease instead of smooth oil; cheap and no leakage of sealing equipment has not yet; some sealing effect is good; but expensive; economically not feasible. Through investigation and research; resolution of the bladder test with smooth grease instead of smooth oil to smooth .
3.1 The transformation method takes into account that the pump shaft power is only 18.5kw; the flow rate is only 200m3/h, the pump speed is 1450r/min; the line speed is 3.4m/s. From the above two points; smoothing with smooth grease is feasible. .
3. 2 The specific method is as follows: 1. Discharge the oil in the fuel tank; remove the bearing housing.
2 Turn the end caps and oil drain holes on both ends of the bearing box to open; to remove the air inside the box.
3 Use a grease gun to fill the lithium grease from the oil filler hole into the bearing housing; add the smooth grease from the two caps and the oil drain hole; consider filling; and tighten the bearing end cap and the oil drain plug. 2. Use the hand to drive the car; make the smooth grease evenly spread in the box.
After starting the pump; open the outlet valve; make the pump work under normal conditions; supervise the temperature and oil quality of the two bearings of the pump. Monitor the temperature with an infrared thermometer; the data is shown in Table 1:
Table 1 Bearing temperature changes with working time Working time / h
Inner bearing temperature / °C
Outer bearing temperature / °C
Room temperature / °C
0. 17
40
41
35
0.33
42
44
35
0.50
44
47
35
0.67
47
50
35
0.83
49
53
35
1
50
54
35
2
50
54
35
10
50
53
34
240
45
50
32
720
44
49
31
After the transformation, the oscillation displacement is about 0. 04mm.
The smooth grease oil is outstanding and unchanged; the pump works normally; it can be seen from the temperature monitoring data and the oscillation monitoring data; it is feasible to replace the smooth oil with smooth grease; it can be applied on the same type of pump.
3. 3 smooth grease smoothing smooth grease is not easy to leak; it is conducive to the smoothness of the water pump bearing; ensure the safe and stable operation of the pump; greatly reduce the amount of fueling and refueling. Not only save fuel; but also reduce the labor intensity of workers. Specifically:
1Save oil cost. Applying smooth grease, each pump costs 9kg/a; the cost is 63 yuan/a. The oil consumption is 4kg/month under the skeleton oil seal; the cost is 200 yuan/a. Each pump can save 137 yuan / a; greatly reduced the smooth cost.
2 reduce maintenance costs. The average life of the skeleton oil seal is 4 months; to replace the skeleton oil seal; to repair and repair 3 times a year; to change the lithium base grease; reduce labor costs, material costs, machinery costs; and avoid overhaul Damage to equipment parts formed during the process.
3 extends the equipment working cycle. It is monitored from the aspects of oscillation and temperature; it has good sealing performance with smooth grease; the bearing works well; the service life of the bearing is extended.
4 improved the post environment.
4, the conclusion is always; replace the mechanical smooth oil with smooth grease; it is practical to use this kind of water pump with low speed and low flow rate; and it has significant economic and environmental benefits; it is a useful tool for economical and reasonable work. Method.

Recommend to friends comments close window

Bearing related knowledge
Rolling bearing fault diagnosis of car wheel bearing normal repair and protection analysis: the seal of the bearing itself
Disposal of scars in SKF bearing units
Estimation of the fatigue life of NTN bearings


This article links to http://
Please indicate China Bearing Network http://

Previous:The shortcomings of the ferrule cracking and preventing the next series: the effect of metal wear self-correcting skills on the bearing life

UCF Pillow Bearing

The UCF pillow block mounted bearing series has four bolt holes, and a set screw lock is designed for mounting onto bearing surfaces parallel to the shaft axis, such as conveyor belts. This ready-to-mount unit has solid base cast iron housing, chrome steel bearings, and is designed for efficient operation at a wide range of speeds. This one-piece pillow block housing allows for a stationary outer ring and rotating inner ring. Insert bearing maintains the separation between moving parts to reduce rotational friction, and to support radial and axial loads. The bearing is secured to the shaft with set screws to prevent slippage. This mounted bearing is used in food and beverage manufacturing, textile industry and many other industrial manufacturing.

Pillow blocks are usually referred to the housings which have a bearing fitted into them & thus the user need not purchase the bearings separately. Pillow blocks are usually mounted in cleaner environments & generally are meant for lesser loads of general industry. These differ from "plummer blocks" which are bearing housings supplied without any bearings & are usually meant for higher load ratings & corrosive industrial environments. However the terms pillow-block & plummer-block are used interchangeably in certain parts of the world.

However fundamental application of both types is the same which is to primarily mount bearings safely enabling their outer ring to be stationary while allowing rotation of the inner ring. The housing is bolted to a foundation through the holes in the base. Bearing housings are either split type or unsplit type. Split type housings are usually two piece housings where the cap and base can be detached. While certain series are one single piece housings. Various seals are provided to prevent dust and other contaminants from entering the housing. Thus the housing provides a clean environment for the expensive bearings to freely rotate hence increasing their performance and duty cycle.

Bearing housings are usually made of grey cast iron. However various different grades of metals can be used to manufacture the same.
Uc Pillow Block Bearing4 Jpg

Ucf Pillow Bearing,Ucf Pillow Block Bearing,Ucf 207 Flange Bearing,Flange Mounted Pillow Block Bearing

Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearings.com