CN201218112Y - Air-cooling turbine generator bearing - Google Patents

Abstract

The utility model relates to an air-cooled turbo-generator bearing which comprises a shaft bushing and a bearing pedestal, the shaft bushing includes an upper half shaft bushing and a lower half shaft bushing, the upper half shaft bushing and the lower half shaft bushing are assembled together to form a spherical surface in which lubricant is filled, the bearing pedestal is made of thick steel plates and is a symmetric structure, oil inlet-outlet holes are respectively drilled on two sides of the bearing pedestal so as to facilitate the installation of the oil pipelines of the machine unit. A middle plate of the bearing pedestal is in full contact of 180 degrees with the lower half shaft bushing, so that an oil inlet groove on the shaft bushing and the spherical surface of the middle board form a closed oil inlet passage. The amount of fastening bolts between the bearing pedestal and an underplate is increased so as to improve the connection rigidity. The oil-sealing device of the bearing adopts a copper dent sealing structure which can effectively prevent lubricant leak.

Description

The air-cooled steam turbine generator bearing

Technical field:

The utility model relates to the air-cooled steam turbine generator bearing.

Background technique:

The air-cooled steam turbine generator bearing is the relatively more crucial position of generator.Every generator has two bearings, lays respectively at the two ends of generator unit stator, is supported on the rotor journal position.The steam turbine generator bearing belongs to a kind of hydrodynamic sliding bearing; between bearing and rotor, has wedge gap; feed lubricant oil in the gap; be adsorbed on the surface of solid, rely on the relative movement between lubricated rubbing surface, lubricant oil forms oil film; produce pressure in the film; drive lubricant oil by the big end in gap to the little end motion in gap, exempt being in contact with one another between solid to bear external load, thereby play the effect of reduce friction resistance and protection solid surface.Thereby the rotor that bearings is run up.But prevent that lubricant oil from flowing in the stator, causes electric accident.Simultaneously reduce bearing vibration again, prevent that whole unit vibration is excessive.Intrinsic end bracket type bearing basic structure as shown in Figure 1, the oil seal of bearing adopts sealing gland ring sealing configuration 1, utilize the air pressure principle to seal, bearing links together with the end cap at out frame two ends respectively, compact structure, reduces the whole generator axial length.But in the unit that has moved, the bearing of part of generating units exists that to exist bearing support axial vibration to the phenomenon of the inboard leakage of oil of generator and part of generating units big, causes that unit tripping shuts down phenomenon.

Summary of the invention:

The purpose of this utility model provides low vibration, the air-cooled steam turbine generator bearing of no leakage of oil.The purpose of this utility model realizes by following structure: the utility model is a kind of air-cooled steam turbine generator bearing, adopts independently pedestal bearing structure, and bearing support separates with the small end lid.The utility model is made up of bearing shell and bearing support two-part.Bearing shell is divided into upper half-bearing and low brass, upper half-bearing and low brass composition form sphere together, low brass adopts 180 ° of global faces to contact with plate in the bearing support, and cast out the oil inlet passage of a sealing of cricket face formation in oil-feed tank and the bearing support at bearing shell sphere position, the inner lubricant oil that feeds.When rotor high-speed rotates, bearing shell is adjusted automatically with the difference of axle journal, adapt to the concrete conditions such as resiliently deformable, deflection of different load, rotating speed, axle, guarantee the appropriate gap between axle journal and bearing shell, thereby can set up the lubricant film of reliable liquid friction.Bearing support is processed by Plate Steel, is symplex structure, and the top sphere of bearing upper cover and bearing shell is the interference fit of 0～0.02mm, the bearing support height is 1460mm, the bearing support width is 630mm, and the handle between bearing support and the seat board closes bolt quantity and increases to 12, thereby improves coupling stiffness.The bearing oil seal arrangement adopts copper labyrinth seal structure.Effectively isolated leakage of oil.Have the turnover oilhole in the bearing support both sides, the scavenge oil hole is φ 210mm, makes things convenient for the installation of unit oil pipe line.

The improved measure of the utility model mainly contains following several respects:

1.1 adopt independently pedestal bearing, bearing support is separated with the small end lid, cut off the passage of leakage of oil in machine.Avoided the vibration of generator body to reach the vibration that bearing support causes by little end cap.

1.2 improve the bearing oil sealing configuration, cancellation Primordial Qi seal ring, adopt copper labyrinth seal structure, because the hardness ratio rotating shaft of copper is low, the scavenge oil hole is strengthened on the rotating shaft surface of can not wearing and tearing when contacting with rotating shaft simultaneously, and oily back-flow velocity is increased, oil resistance phenomenon does not take place, and thoroughly stops leakage of oil problem in machine.

1.3 change bearing support into symplex structure, loading ability of bearing center and bearing centre off-centre is overlapped, solved the eccentric vibration that causes.Reasonable Arrangement oil circuit and assembly space reduce the bearing support height, increase the bearing support width, improve the bearing support integral rigidity.Improve the coupling stiffness of upper and lower semiaxis bearing, two spheres of original low brass are contacted with plate in the bearing support make low brass into and adopt 180 ° of global faces to contact with middle plate; Improve the coupling stiffness between bearing support and the seat board, increase connecting bolt quantity.The increase of bearing rigidity makes because the low bear vibration that causes of bearing rigidity is greatly diminished.Cancel the unidirectional oil-feed of former bearing structure design, realize two-way oil-feed, be convenient to the installation of power plant.The utility model advantage is: bearing rigidity increases, and bear vibration is greatly diminished; The bearing leakage of oil obtains very big improvement.

Description of drawings:

Fig. 1 is for adopting the bearing of sealing gland ring sealing configuration

Fig. 2 is overall structure figure of the present utility model

Fig. 3 is for installing the outline drawing of the utility model unit

Embodiment:

Be illustrated in figure 3 as a kind of air-cooled steam turbine generator bearing, adopt independently pedestal bearing structure, bearing support separates with the small end lid, upper half-bearing 3 forms sphere with low brass 5 compositions together, low brass 5 adopts 180 ° of global faces to contact with plate 6 in the bearing support, and cast out the oil inlet passage of a sealing of cricket face 6 formation in oil-feed tank and the bearing support at bearing shell sphere position, bearing upper cover 2 is the interference fit of 0～0.02mm with the top sphere of bearing shell.Bearing support 7 highly is 1460mm, and bearing support 7 width are 630mm, and scavenge oil hole 10 is φ 210mm, and it is 12 that the handle between bearing support 7 and the seat board 8 closes bolt 9 quantity, and bearing oil seal arrangement 4 adopts copper labyrinth seal structure.As shown in Figure 3, rotor shaft 12 lengthenings are example with rated capacity 150MW steam turbine generator, and rotor shaft lengthening 450mm reserves enough spaces like this and places independently the utility model pedestal bearing of Fig. 2.Fig. 2 bearing support 7 is separated with Fig. 3 small end lid 11.Lubricant oil can be unobstructed inflow bearing both sides, realize two-way turnover oil, not only satisfied designing institute and required but also be convenient to Installation in Plant oil outer pipeline.

Claims (1)

1, a kind of air-cooled steam turbine generator bearing, it is characterized in that: adopt independently pedestal bearing structure, bearing support separates with the small end lid, upper half-bearing (3) forms sphere with low brass (5) composition together, low brass (5) adopts 180 ° of global faces to contact with plate (6) in the bearing support, and cast out the oil inlet passage of a sealing of cricket face (6) formation in oil-feed tank and the bearing support at bearing shell sphere position, bearing upper cover (2) is the interference fit of 0～0.02mm with the top sphere of bearing shell, bearing support (7) highly is 1460mm, bearing support (7) width is 630mm, scavenge oil hole (10) is φ 210mm, it is 12 that handle between bearing support (7) and the seat board (8) closes bolt (9) quantity, and bearing oil seal arrangement (4) adopts copper labyrinth seal structure.

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