JP2578567B2 - Non-eccentric sliding load bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a kind of sliding bearing having no eccentricity under a constant axial angular velocity and a constant load operating condition, and is particularly applied to a turbine generator. The non-eccentric sliding bearing according to the invention usually consists of a movable wear-resistant baffle plate positioned on the horizontal position of the sliding channel of the bush of the bearing. The leaf spring is a baffle plate mounted close to the axial plane of the shaft to stop the continuous circulating film flow (laminar flow) in the same central channel so that a pressure Couette flow is formed. Attached to the rear end of the

[0002] The resulting pressure of the jet flow is used to balance the constant load and keep the channels concentric. The baffle plate is also a Taylor vortex (Tay
lor Vortices) and can be used to reduce their adverse hydrodynamic effects on film flow, and the present invention provides high stiffness, high stability and low moment of drag forces. A sliding bearing with features.

[0003]

BACKGROUND OF THE INVENTION Conventional sliding bearings with dynamic pressure, regardless of their structure, have two hydrodynamic features as described below.

(1) Lifting force is generated by angular velocity and shaft eccentricity. The eccentricity varies along the gap between the bearing bush and the shaft, thus creating a lifting force that balances the load. Thus, the eccentricity due to the load is the first feature of the conventional sliding bearing.

(2) Generally, during normal lubricating film flow, a spiral motion occurs around the gap around the bearing together with the Taylor vortex--shearing machine, thereby increasing the energy consumption by exchanging momentum of the momentum of the film flow. . The number of Taylor vortices is increased by their shunts as the angular velocity of the shaft is increased. Thus, the presence of Taylor vortices and their shunts in the film stream is a second feature of conventional sliding bearings.

[0006] The eccentricity of the shaft, in a periodic manner, makes its central movement and oscillates and destabilizes the film flow. The presence of Taylor vortices and their shunts enhances film flow instability and energy consumption.

[0007]

In the concentric position, there is no lifting force generated as in conventional bearings, but rather a heavy load leads to a greater eccentricity and therefore less rigidity, low stability and high Energy consumption has been the three disadvantages of this type of conventional bearing. Accordingly, it is an object of the present invention to provide a sliding bearing having high rigidity, low energy consumption and no eccentricity under a constant load condition at a constant angular velocity of the shaft.

[0008]

SUMMARY OF THE INVENTION An eccentric sliding load bearing according to the present invention provides a radius set at 60 to 150 degrees in front of the load acting on the shaft (i.e., in the direction of opposite rotation of the shaft). Directional sliding channel, a wear-resistant movable baffle plate positioned in the sliding channel, and a plate mounted at the rear end of the movable baffle plate and used to mount the movable baffle plate proximate the axial surface. Consists of a spring.

Then, the movable baffle plate stops the generation of a lifting force that balances the on-axis load at the same center position as the circulation of the flow generating the pressure jet flow. Movable baffle plates are used to suppress the development and development of Taylor vortices to increase safety and reduce the moment of drag of the film flow.

The advantages of the present invention can be summarized as follows: (1) The lifting force generates a constant load in the same central position as in the case of the axis. (2) Taylor vortex is filtered,
Stability is increased and energy consumption is reduced.

(3) With respect to the advantage of the above (1), since the average clearance C between the bush and the shaft is reduced,
For example, large sliding bearings which reduce the clearance C, magnetic gaps of large turbine generators have great advantages, the efficiency of the generator is increased, and the turbulence of the film is reduced by the ordinary sliding bearing (Reynolds number When occurring (such as Re> 1000), a smaller clearance C can be selected in the present invention, which results in a Reynolds number Re << 1000 when other operating and geometric conditions are unchanged.
A complete laminar film stream with low energy consumption,
It can be generated instead of film turbulence with high energy consumption.

[0012]

1 to 3 show a non-eccentric vertical load sliding bearing rotating clockwise, the bearing comprising an upper bush 1,
It comprises a lower bush 2, a shaft 3, an axial sealing element 7, an oil supply pipeline 5 and an oil tank 6. A feature in this construction is that the radial sliding channel 9 is set at a position 60 to 150 degrees, particularly preferably 90 degrees, forward (ie in a counterclockwise direction) of the vertical load on the interface of the upper bush 1. , Its use balances a certain vertical load.

A wear-resistant sliding movable baffle plate 11 is attached to the sliding channel 9. The leaf spring 8 is mounted on the rear end of the sliding movable baffle plate 11, whereby the sliding movable baffle plate 11 is mounted close to the surface of the shaft 3. The size of the sliding channel 9 is made of a wear-resistant material so as to fit the sliding movable baffle plate 11 without leakage of the lubricating oil.

The oil supply pipeline 5 and the oil tank 6 are shown in FIG. 3, and the schematic pressure distribution around the bush is shown in FIG. The structure as described above is used to balance vertical loads.

Further, the bearing is provided with an automatic cooling oil supply device shown in FIG. A high pressure area 10 and a low pressure area 12 are formed before and after the sliding movable baffle plate 11 for cooling and filtering the lubricating oil via pipelines 13, 14 and 15, adjustable needle valve 17 and cooling tank 16. Automatic circulation pipeline equipment is formed. Adjustable needle valve 17 is used to adjust the lubrication oil filling and bearing lifting force.

[0016]

As described above, the present invention relates to an eccentric sliding load bearing comprising a bush and a shaft, wherein the bearing is provided in front of a load acting on the shaft (that is, in a direction opposite to the rotation of the shaft). A) a radial sliding channel set at a position between 60 and 150 degrees, a wear-resistant sliding movable baffle plate positioned in the sliding channel, and a leaf spring attached to the rear end of the sliding movable baffle plate. Have
As a result, the sliding baffle plate is mounted close to the shaft surface, so that rather high rigidity and low energy consumption are possible under a constant load at a constant angular velocity of the shaft, and a kind of sliding without eccentricity. Bearings can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a non-eccentric sliding load bearing.

FIG. 2 is a schematic sectional view taken along the line II-II of FIG.

FIG. 3 is a schematic sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a schematic view showing a pressure distribution around a bush by a movable baffle plate.

[Description of sign]

 DESCRIPTION OF SYMBOLS 1 Upper bush 2 Lower bush 3 Shaft 4 Oil supply pipeline 6 Oil tank 8 Leaf spring 9 Sliding channel 10 High pressure area 11 Movable baffle plate 12 Low pressure area 13, 14, 15 Pipeline 16 Cooling tank 17 Needle valve

Claims (3)

(57) [Claims] 1. A non-eccentric sliding load bearing comprising a bush and a shaft, wherein the bearing is located between 60 and 1 in front of a load acting on said shaft 3 (ie in a direction opposite to the rotation of said shaft).
A radial sliding channel 9 set at a position of 50 degrees,
The wear-resistant sliding movable baffle plate 11 includes a wear-resistant sliding movable baffle plate 11 positioned in the sliding channel 9 and a leaf spring 8 attached to a rear end of the sliding movable baffle plate 11. The non-eccentric sliding load bearing is mounted near the shaft 3. 2. A non-eccentric slide according to claim 1, wherein the sliding load bearing has a radial sliding channel 9 set in a horizontal position in front of a load acting on the shaft 3. Dynamic load bearing. 3. The sliding load bearing has an automatic circulating cooling device and a lifting force adjusting device, and the adjusting device includes a high-pressure region 10 and a low-pressure region 12 formed before and after a wear-resistant sliding movable baffle plate 11. A needle valve 17 and a cooling oil tank 16 communicating with the pipelines 13, 14, 15 are constituted by a circulating pipeline device for cooling and filtering the lubricating oil. The wand according to claim 1, characterized in that the two ends of the pipelines (13, 14) are connected to the high-pressure area (10) and the low-pressure area (12), respectively, used to adjust the lifting force for mating. Eccentric sliding load bearing.