Prolonging the service life of vertical shaft pump guide bearing is not only the embodiment of equipment technical quality index, but also the reflection of economic index, which is the need of the whole machine's service life. Analysis of vertical long axis pump guide bearing a shorter life causes from many aspects, and provide a theoretical basis for the selection of proper design, vertical long shaft pump guide bearing, thereby reducing the vertical long shaft pump guide bearing wear, improve reliability, save maintenance cost.

Vertical long axis pump is a new generation of energy-saving environmental protection lifting pump developed in recent years. It is a special product designed for metallurgy, mining, power, petrochemical and other industries. Mainly responsible for the use of iron oxide, sediment particles, oil pollution of the recycled water or sewage, the use of medium temperature is less than 80 degrees, liquid solid mixture of solid particles in the volume of not more than 8%.

Structurally, the vertical long axis pump consists of four parts:

(1) transmission parts: including elastic column pin, coupling, motor shaft, transmission shaft, blade shaft, shaft sleeve (wire mother coupling), adjusting nut, thrust bearing, radial bearing, guide bearing, shaft sleeve, etc.;

(2) energy conversion part: including filter screen, inlet section, impeller, guide vane and so on;

(3) the water conveyance section includes the water pipe, the pipe, the guide bearing body and the water outlet bend;

(4) lubrication part: the sliding bearing of the pump adopts more than 0.3MPa cleaning water to guide the bearing to be flushed, lubricated and cooled.

Performance, because of its simple hydraulic components, the operation efficiency is generally higher than the level of the pump and other horizontal pumps. The main difference between the pump and the submerged pump is that the efficiency is high, the requirements of the motor and other components are lower, and the stability is better. Compared with the pump, it is more suitable for pumping large flow liquid. Main parameters range: flow 30-9000 cubic meters per hour, lift 7-200 meters. The pump has many advantages, energy saving, high efficiency is its biggest advantage. At the same time, the pump also has some shortcomings, mainly the running life is not long, which is related to the guide bearing in the vertical long axis pump structure.

Basic situation, analysis and solution of vertical long axis pump guide bearing:

(1) structure and life profile of vertical type long axis pump guide bearing;

Vertical long shaft pump guide bearing axis operation plays a supporting role, there are usually 3, respectively on the guide bearings, guide bearings and bearing. If the submerged depth is very long, the number of guide bearings will increase. The guide bearing is composed of bearings and bearings, and its structure is shown in figure 1.

In practical operation, the service life of the guide bearing is usually 9~12 months. Table 1 shows the service life of vertical long axis pump guide bearings. As can be seen, the longest and the shortest life span is twice the difference.

(two) analysis of the reasons for shorter service life

Vertical long axis pump guide bearing life shorter reasons may have the following aspects:

1. vertical long axis pump guide bearing materials used in the problem

After the vertical shaft pump is installed vertically, the dynamic unbalance is great. To make the pump stable for a long time, this requires the guide bearing to balance the radial force caused by the dynamic unbalance. This requires that the guide bearing material be wear-resistant. Besides, it doesn't hurt the axle. Therefore, the guide bearing becomes relatively easy to wear, and finally, the axle can be protected at the expense of easy replacement and cheaper guide bearings.

2. the problem of lubricating water

3. axis machining and installation problems

4. site operation management problems

(three) how to prolong the life of vertical shaft pump guide bearings. After investigation and research, we have the following solutions:

1. use high quality or new material to prolong the service life of guide bearing

At present, many materials are used on guide bearings, such as metal, rubber, neoprene, and so on. Here, the main things can be filled and filled PTFE two materials guide bearing.

1). What material is a kind of plastic polymer materials by advanced engineering heat produced in South Africa by French patent technology, and the bearing material can run in lubricating oil, lubricating grease, water and self lubrication conditions, and does not require too much maintenance. Precisely because of this, a lot of higher demand for the use of occasions, choose everything can be used as guide bearing materials.

2). PTFE is a certain amount of glass fiber and graphite filler such as Teflon, so its wear resistance, hardness, thermal conductivity, compressive strength has been significantly improved, the linear expansion coefficient decreased; the average service life of Filled PTFE guide bearing than rubber guide bearing, graphite guide bearings should be long.

2. increase the anti playing device can prolong the sewage pump life guide bearing of vertical axis.

3., strict implementation of the spindle machining and installation standards.

4., attention to maintenance, but also to extend the vertical long axis pump guide bearing life.

For vertical long axis pumps, the main means of maintenance are:

(a) when installing and servicing, wear resistant additives on guide bearings and shafts;

(b) when the pump starts running and stops, the normal stopping of the lubricating water is also an important factor affecting the service life of the guide bearing. Normal operation order is: start with lubrication water first, then turn on the machine. When stopping, stop first and then stop for water skiing.

(c) after the overhaul, especially after the overhaul, the motor and pump installation is best to re adjust the installation, otherwise the guide bearings and shafts can not be homing, so that the guide bearings produce new grinding marks, and accelerate the wear of guide bearings.