CN212583868U - Water guide mechanism bearing of water turbine - Google Patents

Abstract

The utility model provides a hydraulic turbine water distributor bearing to excellent performance's tin phosphor bronze alloy board is the base member, firmly inlays self-lubricating material at its inner surface, forms through the finish machining after the axle sleeve system of rolling up. The utility model discloses a bearing has high abrasion resistance and excellent mechanical properties, and bearing capacity is high, and coefficient of friction is little, has avoided because mechanical deformation and temperature deformation cause the bearing to damage, and its low friction performance and self-lubricating property reduce characteristics such as bearing running loss.

Description

Water guide mechanism bearing of water turbine

Technical Field

The utility model belongs to the technical field of hydraulic and electric power engineering, in particular to hydraulic turbine water distributor bearing.

Background

The water guide mechanism of the water turbine has the functions of rotating the water flow before entering the runner and changing the incident angle of the water flow. The bearing of the water distributor is an important part of the water turbine, and not only needs to bear the water moment and the friction moment of the water distributor of the unit, but also needs to bear the radial operating moment of the guide vanes under various opening degrees during operation, so that the bearing is an important bearing for determining whether the transmission part of the water distributor of the unit is flexible and reliable, the operating performance of the bearing is good or bad, and the safe and stable operation of the whole unit, the whole power station and even a power system is directly influenced.

The traditional steel-backed polyformaldehyde composite material bearing is formed by rolling a common steel plate serving as a matrix and a surface-sintered modified polyformaldehyde serving as a wear-resistant layer, wherein a shaft sleeve is formed by cutting a plate and then rolling the cut plate. The thickness of the composite layer of the material is 0.5-0.7 mm, the surface of the composite layer is provided with an oil storage pit, and the composite layer is a boundary lubricating material. The bearing can often corrode, rust and the like in the use process, the friction layer is thin, the motion resistance and the power consumption are high, the bearing is easy to wear and deform under the oil-free condition, and if the bearing and a guide vane shaft neck are blocked and locked in operation, a shearing pin is sheared, so that the unit is shut down due to accidents.

Aiming at the defects of small unit load and large friction loss of the original steel-backed polyformaldehyde bearing, the improved copper-based inlaid self-lubricating bearing is formed by taking a tin-phosphor bronze alloy plate with excellent performance as a base body, firmly inlaying a modified polytetrafluoroethylene material on the surface of the tin-phosphor bronze alloy plate as a self-lubricating material through a special process, and rolling a shaft sleeve and then performing finish machining, wherein the material is the self-lubricating material. The copper-based inlaid self-lubricating bearing has lubricity, the stress condition of the bearing surface is effectively improved, the bearing is prevented from being locked due to mechanical deformation and temperature deformation during operation, the bearing is kept in a stable self-lubricating state and a low-friction state, the unit load of the bearing is improved, the friction loss is reduced, and the unit operation safety is guaranteed.

SUMMERY OF THE UTILITY MODEL

The shortcoming that unit load is little, the friction loss is big to current steel backing polyformaldehyde combined material's bearing existence, the utility model provides a hydraulic turbine water distributor bearing makes bearing steady self-lubricating and be in the low friction state, has improved the unit load of bearing and has reduced the friction loss, and unit operation safety obtains the guarantee.

The utility model discloses a realize through following technical scheme:

a bearing of a water guide mechanism of a water turbine comprises a main body, a bearing body and a bearing seat, wherein the main body is an 8-shaped cylindrical base body; a plurality of round holes are uniformly distributed on the inner wall of the cylindrical base body; the round hole is embedded with solid lubricant.

As a further improvement of the utility model, the area of the solid lubricant accounts for 25 to 31 percent of the sliding area.

As a further improvement of the utility model, the cylindrical base body is made of a tin-phosphor bronze alloy plate.

As a further improvement of the utility model, the solid lubricant is prepared by modified polytetrafluoroethylene.

The cylindrical base body of the utility model is made of a tin-phosphor bronze alloy plate with excellent performance, and the solid lubricant is prepared by modified polytetrafluoroethylene and is embedded in the round hole of the inner wall of the cylindrical base body through a special process. The utility model discloses a bearing during operation, solid lubricant forms the solid lubrication film on bearing surface and friction mating parts surface, realizes the self-lubricating, can weaken the vice metal of friction within a definite time, direct contact to reduce the work running resistance, even under high load, also can gain fine lubricated effect, solved the problem of bearing running loss, deformation.

The phosphor bronze has higher corrosion resistance, abrasion resistance and good electrical conductivity, is not easy to generate heat, does not generate sparks during impact, is used for medium-speed and heavy-load bearings, and has the highest working temperature of 250 ℃; meanwhile, the self-aligning bearing has the characteristics of automatic aligning, insensitivity to deflection, uniform bearing capacity of the bearing, capability of bearing radial load, no need of maintenance for self-lubricating and the like. The solid lubricant prepared from the polytetrafluoroethylene has good chemical stability, thermal stability and aging resistance, has very low friction factor under the conditions of different sliding speeds, contact forms, loads and temperatures, and can well reduce the friction loss of the bearing.

The utility model has the advantages that:

the utility model discloses a bearing forms the solid lubrication film on surface and friction mating member surface, realizes the self-lubricating, has solved the problem of bearing running loss, deformation, can be in gyration, swing, reciprocating motion etc. heavy load low-speed, be difficult for forming the dry friction operating mode condition of oil film under the safety and stability operation, have bearing capacity height, coefficient of friction little, wear resistance good, long service life, need not refuel characteristics such as.

Drawings

Fig. 1 is a schematic structural diagram of the bearing of the present invention.

1-cylindrical matrix, 2-round hole.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Example 1

The water turbine distributor bearing shown in fig. 1 has a cylindrical main body 1 in an 8 shape; a plurality of circular holes 2 are uniformly distributed on the inner wall of the cylindrical base body 1; the round hole 2 is embedded with solid lubricant.

The cylindrical matrix 1 is made of a tin-phosphor bronze alloy plate with excellent performance, the solid lubricant is made of a modified polytetrafluoroethylene material and is firmly embedded in a circular hole in the inner surface of the cylindrical matrix 1 through a special process, and the total area of the solid lubricant accounts for 25% of the sliding area.

Example 2

Compared with embodiment 1, the present embodiment is different in that: the solid lubricant occupies 28% of the sliding area.

Example 3

Compared with embodiment 1, the present embodiment is different in that: the solid lubricant occupied 31% of the sliding area.

When in use, the bearing is cleaned completely, and the bearing surface and the base body are cleaned by cleaning soft cloth and alcohol (or gasoline). The method comprises the steps of coating a layer of clean turbine oil on a guide vane shaft sleeve body needing to be sleeved with a bearing, firstly placing the bearing on the guide vane shaft sleeve, then sleeving a special tool on the upper end of the bearing, after the joint and the verticality of the bearing are adjusted, symmetrically knocking the special tool from top to bottom by using a copper rod to enable the bearing to gradually fall into the guide vane shaft sleeve, after the bearing is completely installed in place, knocking an installing tool by using the copper rod to loosen, then slowly taking out the tool, and completing bearing installation work.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention may be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.

Claims (4)

1. The utility model provides a hydraulic turbine water distributor bearing which characterized in that: the main body is a cylindrical matrix (1) in an 8 shape; a plurality of round holes (2) are uniformly distributed on the inner wall of the cylindrical base body (1); the round hole (2) is embedded with solid lubricant.

2. The turbine distributor bearing of claim 1, wherein: the area of the solid lubricant accounts for 25-31% of the sliding area.

3. The turbine distributor bearing of claim 1, wherein: the cylindrical matrix (1) is made of a tin-phosphor bronze alloy plate.

4. The turbine distributor bearing of claim 1, wherein: the solid lubricant is prepared from modified polytetrafluoroethylene.

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