CN105351359A - Fluid supporting tilting-pad bearing - Google Patents

Abstract

A fluid-supported tilting pad sliding bearing, comprising a bearing shell, bearing pads are installed on its inner surface, the two sides of which are connected to the bearing end cover, the mechanical shaft passes through the through hole of the bearing pad to form an interference fit, and the two sides The end is installed in the strip hole on the bearing end cover, allowing the bearing pad to float radially. There is an oil supply groove on the outer surface of the bearing shell, and an oil supply duct is provided on the bearing shell and the bearing pad. There is an oil groove on the inner surface of the block, and the oil supply groove is connected with the oil groove through the oil supply conduit. The bearing pad is provided with a central small hole, and the outer surface of the bearing pad is provided with a static pressure chamber. The dynamic pressure oil film area formed by the wedge-shaped convergence gap formed on the inner surface of the bearing pad is connected. The oil drain groove is provided on the bearing end cover, and the oil drain groove allows the lubricating oil in the bearing to leak to the outside of the bearing through the groove. The invention can reduce the The bearing's reliance on external high oil supply pressure facilitates assembly and pad condition monitoring.

Description

A fluid-supported tilting pad bearing

technical field

The invention relates to the technical field of fluid lubrication, in particular to a fluid-supported tilting pad bearing.

Background technique

Oil whirl is the main cause of rotor instability at high speed, but the mechanism of oil whirl has not yet been theoretically explained satisfactorily. However, as long as there is oil film whirl, the bearing cannot operate normally at a certain speed and load. Through the design of the bearing, the stability of the bearing-rotor system can be enhanced, and the possible oil film whirl phenomenon can be eliminated or weakened. At present, the forms of radial sliding bearings widely used in large rotating machinery are ranked in order of stability: tilting pad bearings, three-lobe bearings, elliptical bearings and round bearings. The biggest advantage of the tilting pad bearing is that it can eliminate or weaken the oil film whirl of the journal at high speed, so it is widely used in large rotating machinery at present.

Although the use of the above-mentioned bearings greatly reduces or weakens the possibility of the occurrence of the oil film whirl phenomenon, the subsequent high power consumption and high cost also limit the further application of these bearings. Traditional tilting pad bearings achieve higher stability through high power consumption, while fluid pivot bearings can only be used in a small range due to their higher processing costs and more complicated assembly.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a fluid-supported tilting pad bearing, which can reduce the bearing's dependence on external high oil supply pressure, facilitate assembly and monitor the state of the pad.

In order to achieve the above object, the technical scheme that the present invention takes is:

A fluid-supported tilting pad sliding bearing, comprising a bearing shell 1, three bearing pads 2 are installed on the inner surface of the bearing shell 1, both sides of the bearing shell 1 are connected with the bearing end cover 3, and the bearing pads 2 There is a through hole on the top, the mechanical shaft 5 passes through the through hole and forms an interference fit, the mechanical shaft 5 is installed in the strip hole 6 opened on the bearing end cover 3, and limits the circumferential movement of the bearing pad 2. The shaft 5 moves along the strip hole 6 to allow the bearing pad 2 to float radially,

The outer surface of the bearing housing 1 is provided with an oil supply groove 7, a first oil supply conduit 8 is provided in the radial direction of the bearing housing 1, a second oil supply conduit 9 is provided in the radial direction of the bearing pad 2, and the bearing There are evenly distributed oil grooves 10 on the inner surface of the pad 2, the oil supply groove 7 communicates with the oil groove 10 through the first oil supply conduit 8, the second oil supply conduit 9 and the oil groove 10, and the oil groove 10 is arranged symmetrically with respect to the axial direction of the bearing pad 2,

The geometric center of the bearing pad 2 is provided with a central small hole 11, and the outer surface of the bearing pad 2 is provided with a uniform static pressure chamber 12, and the static pressure chamber 12 makes the journal and the bearing pad 2 through the central small hole 11. The dynamic pressure oil film area formed by the wedge-shaped convergence gap formed on the inner surface is connected,

The bearing end cover 3 is evenly distributed with oil drain grooves 13 upwards on the upper circumference, and the oil drain grooves 13 allow the lubricating oil in the bearing to leak out to the outside of the bearing through the grooves.

The outer surface of the bearing pad 2 has the same radius as the inner surface of the bearing housing 1, and the outer surface of the bearing pad 2 needs to be finely ground to ensure that the outer surface of the bearing pad 2 is in contact with the bearing housing 1. There is more than 95% fit between the inner surfaces, the radius of the inner surface of the bearing pad 2 is equal to the radius of the journal, and the bearing pad 2 has a preset eccentricity of 1/1000 to 2/1000.

The bearing housing 1 is an integral structure or adopts a split structure.

The beneficial effect of the present invention is: the mechanical shaft 5 makes it easier to control the posture of the bearing pad. At the same time, due to the existence of the mechanical shaft 5, the positioning, maintenance and replacement of the bearing pads are more convenient.

Since the inner surface of the bearing pad 2 is provided with evenly distributed oil grooves 10, the pads of this bearing are well lubricated and the oil film is evenly distributed, so it is not necessary to use a large amount of lubrication due to the special lubrication method like ordinary tilting pad bearings. Oil.

Due to the combined action of the hydrostatic oil film and the mechanical shaft 5 of the bearing pads, the bearing can adapt to different speeds and loads and can allow certain deflection and misalignment of the journal while obtaining optimal load-bearing performance.

To sum up, the present invention improves the performance of the bearing, reduces the whirl effect of the oil film, and makes the bearing structure more compact.

Description of drawings

Figure 1 is an isometric view of a fluid-supported tilting pad bearing.

Figure 2 is a front view of a fluid-supported tilting pad bearing.

FIG. 3 is an axonometric view of the bearing pad 2 .

Fig. 4 is a cross-sectional view of Fig. 2 taken along line A-A.

Fig. 5 is a sectional view taken along line B-B of Fig. 2 .

FIG. 6 is a plan view of the bearing pad 2 .

FIG. 7 is a split view of the longitudinal middle section of the bearing pad 2 .

FIG. 8 is a rotated view of viewpoint C in FIG. 7 .

FIG. 9 is a front view of the bearing cover 3 .

FIG. 10 is a partially enlarged view of part D of FIG. 9 .

FIG. 11 is a sectional view of FIG. 9 .

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to Figure 1, Figure 2 and Figure 3, a fluid-supported tilting pad sliding bearing includes a bearing housing 1, three bearing pads 2 are installed on the inner surface of the bearing housing 1, and the two sides of the bearing housing 1 pass through The bolt 4 is connected with the bearing end cover 3, and a through hole is opened on the bearing pad 2, and the mechanical shaft 5 passes through the through hole to form an interference fit to ensure that there is no relative movement between the bearing pad 2 and the mechanical shaft 5. At this time, the bearing pad 2 and the mechanical shaft 5 can be regarded as a whole, and the mechanical shaft 5 is installed in the strip hole 6 opened on the bearing end cover 3 to limit the circumferential movement of the bearing pad 2. The geometric shape of the strip hole 6 It is strip-shaped, and the bearing pad 2 swings around the mechanical shaft 5 around the integral structure with the mechanical shaft 5, and the mechanical shaft 5 moves along the strip-shaped hole 6 to allow the bearing pad 2 to float radially.

Referring to Fig. 4, Fig. 5, Fig. 6, Fig. 7 and Fig. 8, the outer surface of the bearing housing 1 is provided with an oil supply groove 7 for providing lubricating oil for the bearing, and the radial direction of the bearing housing 1 is provided with a first An oil supply conduit 8, a second oil supply conduit 9 is arranged on the radial direction of the bearing pad 2, and uniformly distributed oil grooves 10 are arranged on the inner surface of the bearing pad 2, and the oil supply groove 7 passes through the first oil supply conduit 8, the second oil supply conduit The oil conduit 9 communicates with the oil groove 10, so that a uniform oil film is produced on the inner surface of the entire bearing pad 2. The oil groove 10 is arranged symmetrically with respect to the axial direction of the bearing pad 2, so that a uniform oil film is generated regardless of the positive and negative rotation of the journal. The direct oil supply to each bearing pad 2 and the increased oil drain make the efficiency higher,

The geometric center of the bearing pad 2 is provided with a central small hole 11, and the outer surface of the bearing pad 2 is provided with a uniformly distributed static pressure chamber 12, and the static pressure chamber 12 is connected with the journal and the bearing pad 2 through the central small hole 11. The dynamic pressure oil film area formed by the wedge-shaped convergence gap formed on the inner surface is connected,

Referring to Fig. 9, Fig. 10 and Fig. 11, the oil drain groove 13 arranged in the circumferential direction of the bearing end cover 3, the oil drain groove 13 allows the lubricating oil in the bearing to leak to the outside of the bearing through the groove, increasing the oil drain. Oil volume and effectively reduce agitation loss to reduce power consumption,

The outer surface of the bearing pad 2 has the same radius as the inner surface of the bearing housing 1, and the outer surface of the bearing pad 2 needs to be finely ground to ensure that the outer surface of the bearing pad 2 is in contact with the bearing housing 1. There is a fit of 95% between the inner surfaces, and the radius of the inner surface of the bearing pad 2 is equal to the radius of the journal, but considering the load-bearing performance of the bearing, the bearing pad 2 will have 1/1000 to 2/1000 The preset eccentricity.

The bearing housing 1 is an integral structure or adopts a split structure.

The working principle of the present invention is: the oil supply groove 7 forms a sealing area with the bearing seat, and is filled with lubricating oil under the oil supply pressure of the oil supply system, and the lubricating oil is introduced into the oil groove through the first oil supply conduit 8 and the second oil supply conduit 9 In 10, when the journal starts to rotate, the lubricating oil is brought into the wedge-shaped convergence gap formed by the journal and the inner surface of the bearing pad 2 to form a dynamic pressure oil film, and the lubricating oil forming the dynamic pressure oil film is under the action of high pressure, Through the central small hole 11 of the bearing pad 2, it enters the static pressure chamber 12 on the outer surface of the bearing pad 2. With the continuous entry of pressure oil, a static pressure oil film is formed in the static pressure chamber 12. Under the action of the action, the bearing pad 2 floats radially and is adjusted according to different speeds and loads.

During the oil supply, the lubricating oil will fill the oil supply groove 7 and pass through the first oil supply conduit 8 on the bearing housing 1, the second oil supply conduit 9 on the bearing pad 2 and the uniform distribution of the inner surface of the bearing pad 2. The oil groove 10 enters the convergent wedge-shaped area formed by the journal and the inner surface of the bearing pad 2 to form a dynamic pressure oil film.

Claims (3)

1. a fluid support tilting bush sliding bearing, comprise bearing housing (1), the internal surface of bearing housing (1) is provided with three bearing tiles (2), bearing housing (1) both sides are connected with bearing (ball) cover (3), it is characterized in that: (2) have through hole to bearing tile, mechanical axis (5) is through this through hole and form interference fit, mechanical axis (5) is arranged in the bar hole (6) that bearing (ball) cover (3) is opened, the circumferential movement of restriction bearing tile (2), mechanical axis (5) moves along strip-type hole (6) thus allows bearing tile (2) floating,

The outer surface of described bearing housing (1) has oil supply (7), the radial direction of bearing housing (1) is provided with the first fuel supply duct (8), the radial direction of bearing tile (2) is provided with the second fuel supply duct (9), bearing tile (2) internal surface is provided with uniform oil groove (10), oil supply (7) is communicated with oil groove (10) by the first fuel supply duct (8), the second fuel supply duct (9), oil groove (10) is arranged symmetrically with relative to the axis of bearing tile (2)

Described bearing tile (2) geometrical center is provided with central aperture (11), bearing tile (2) outer surface is provided with uniform static pressure chamber (12), static pressure chamber (12) is restrained by the wedge shape that central aperture (11) and axle journal and bearing tile (2) internal surface are formed the dynamic pressure oil film district that gap produces and is connected

Described bearing (ball) cover (3) last week is upwards evenly equipped with drain pan (13), and drain pan (13) makes lubricant oil in bearing by this groove earial drainage to Bearing outer.

2. a kind of fluid support tilting bush sliding bearing according to claim 1, it is characterized in that: the outer surface of described bearing tile (2) has identical radius with the internal surface of bearing housing (1), and the outer surface of bearing tile (2) needs fine grinding, to ensure the laminating degree having more than 95% between the outer surface of bearing tile (2) and the internal surface of bearing housing (1), the radius of the radius axle journal of the internal surface of bearing tile (2), bearing tile (2) has the preset bias of a thousandth to thousand/bis-.

3. a kind of fluid support tilting bush sliding bearing according to claim 1, is characterized in that: described bearing housing (1) is monolithic construction or adopts split type structure.