KR100697852B1 - Tilting Pad Bearing - Google Patents

Abstract

A tilting type bearing is provided to prevent abrasion of peripheral devices coupled to a shaft or a bearing by absorbing vibration of a rotation shaft at a plurality of pads which are tilted in the bearing. A tilting type bearing includes a main body(110), a pad(130), a fixed ring(120), and a position fixed hole(125). A shaft of the main body is inserted and supported. The pad is installed on the main body. A circular protrusion unit which is supported by the main body is protruded on another plane of the pad. The fixed ring is installed on an end of the main body, and guides and fixes the tilted pad. The position fixed hole is coupled to a position fixed protrusion which is protruded on the main body, and is temporarily fixed on the main body. The circular protrusion unit is inserted into a groove which is formed on an inner circumferential plane of the main body corresponding to the circular protrusion unit of the pad.

Description

Tilting Pad Bearing

1 is a view showing a tilting bearing according to the present invention.

2 is a cross-sectional view of the tilting bearing according to the present invention, which is taken along line A-A of FIG.

3 is an exploded perspective view showing a tilting bearing according to the present invention.

4 is a perspective view illustrating the installation of the tilting bearing according to the present invention.

5 is an analysis result analysis of the overall performance of the tilting bearing according to the present invention, Figure 5a is a view showing the type of bearing, Figure 5b is a view showing the pressure distribution acting on the bearing, Figure 5c and Figure 5d is a graph showing the stiffness and the damping coefficient of the bearing, Figure 5e is a graph showing the bending mode and the swing natural frequency of the bearing, Figure 5f is a graph showing the unbalanced vibration level.

<Description of the symbols for the main parts of the drawings>

100: bearing 110: body

111: groove 112: inlet hole

113: Position fixing protrusion 120: Fixing ring

121,122: bulkhead 123: discharge hole

124: oil passage 125: position fixing hole

130: pad 131: circular protrusions

132: protrusion

The present invention relates to a tilting bearing, and more particularly, a plurality of pads are installed on an inner circumferential surface of a bearing to be tilted in contact with a rotating shaft, thereby absorbing vibration of the shaft so that the pad tilted in the bearing absorbs the shaft or bearing or The present invention relates to a tilting bearing for preventing or minimizing wear of peripheral devices connected thereto.

In general, a bearing is a mechanical element that fixes a shaft of a rotating machine at a fixed position and rotates the shaft while supporting the weight of the shaft and the load on the shaft.

However, when such a conventional bearing is applied to a feed boost pump in which a large vibration is generated, the vibration of the shaft (vibration level generated at an operating speed of 1800 rpm) is not absorbed to the bearing coupled to the shaft of the pump and is transmitted as it is. To shorten the life of the, the shaft vibrating in the bearing due to the friction due to frequent hits in the coupling portion of the shaft or bearing is worn or damaged, or the peripheral devices connected to it is worn and broken.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, a plurality of pads are supported in contact with the rotating shaft in a tiltable manner is installed on the inner circumferential surface of the bearing pad to tilt the vibration of the shaft in the bearing It is an object of the present invention to provide a tilting bearing capable of preventing or minimizing abrasion of a shaft, a bearing, or a peripheral device connected thereto by absorbing.

Tilting bearing of the present invention for achieving the above object, the shaft is inserted into the body is supported; A pad installed on the body and having one surface in contact with an axis and the other surface of which is formed with a protruding round protrusion formed on the body and tilted; It is characterized in that it comprises a; fixed body ring for restraining while guiding the pad is installed and tilted at each end of the body.

Preferably, a groove is formed in the inner circumferential surface of the body corresponding to the circular protrusion of the pad to support the circular protrusion.

And, the groove of the body is formed as a regular groove, the circular protrusion of the pad protrudes larger than the regular groove of the body.

In addition, at least one or more of the stationary ring of the bearing is punctured by a discharge hole through which oil supplied into the bearing is discharged and circulated.

The position fixing protrusion protrudes from the end of the body, and the fixing ring is formed with a position fixing hole into which the position fixing protrusion is inserted to temporarily fix the fixing ring to the body.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a tilting bearing according to the present invention, Figure 2 is a cross-sectional view of the tilting bearing according to the present invention, a cross-sectional view taken along line AA of Figure 1, Figure 3 according to the present invention 4 is an exploded perspective view illustrating a tilting bearing, and FIG. 4 is a perspective view illustrating a tilting bearing in accordance with the present invention.

As shown in FIGS. 1 to 4, the tilting bearing 100 according to the present invention is composed of a body 110, a plurality of pads 130, and a plurality of stationary ring 120.

The body 110 is a hollow tube, inside the journal of the shaft of the feed-up boost pump (not shown) is inserted.

As shown in FIG. 3, the inner circumferential surface of the body 110 is formed with a plurality of grooves 111 gently recessed toward the outer circumferential surface side of the body 110, and the groove 111 is formed as a regular groove, and the pad The number corresponding to 130 is formed.

In addition, an inlet hole 112 through which oil for lubricating the bearing 100 and the shaft is drilled in the body 110 between the grooves 111.

In addition, the upper and lower ends of the body 110 is provided with a pair of stationary ring 120 cut in a semicircular shape, respectively.

As shown in FIG. 2, a partition wall 122 in contact with the inner circumferential surface of the body 110 has a circumferential direction of the fixed body ring 120 at one central portion of the fixed body ring 120 opposite to the end of the body 110. It is formed to protrude downward along.

Thus, the stationary ring 120 is prevented from being separated to the outside of the body 110 in a state seated at the end of the body 110.

In addition, at the inner circumferential side of the fixing ring 120 spaced apart from the partition wall 122, the partition wall 121 for preventing the separation of the pad 130 tilted from the inner surface of the body 110 to be described later is fixed ring. It is formed to protrude downward along the circumferential direction of (120).

On the other hand, the stationary ring 120 is installed in the body 110 as described above is provided in a fixed state in the end of the body 110 bar is fixed, the end of the body 110 a plurality of position fixing projections The protrusion 113 is formed, and the fixing ring 120 has a plurality of positioning fixing holes 125 into which the fixing protrusion 113 is inserted, so that the fixing ring 120 of the body 110 is formed. It is temporarily fixed at the end.

In addition, an oil passage 124 having a groove shape through which oil may flow is formed on an inner circumferential surface of the stationary ring 120, and the stationary ring on one side of the stationary ring 120 is supplied into the bearing 100. A plurality of discharge holes 123 communicated with the oil passage 124 are drilled so that the oil can be discharged to the outside and circulated.

On the other hand, the stationary ring 120 having the discharge hole 123 as described above is preferably installed to be located on the lower side when installing the bearing 100, as shown in FIG.

In addition, the pad 130 is formed in an arc shape corresponding to the body 110, the central portion of the outer surface is supported in the groove 111 of the body 110 to be tiltable, the inner surface of the body 110 Tilt in contact with the journal of the axis being inserted.

In the center portion of the outer surface of the pad 130 supported by the groove 111 of the body 110, a circular protrusion 131 inserted into and supported by the groove 111 is formed to protrude, thereby smoothly tilting the pad 130. In addition to inducing the tilted pad 130 is self-aligned to the original state.

The circular protrusion 131 of the pad 130 is smoothly processed on its surface by polishing or the like.

On the other hand, the circular protrusion 131 of the pad 130 protrudes larger than the groove 111 of the body 110 so that the pad 130 can be tilted smoothly 360 degrees in all directions, the pad 130 and the body The pad 130 is freely tilted in all directions by 360 degrees in a state in which the pad 130 is positioned on the inner surface of the body 110 by a gap formed between the 110.

In addition, the pad 130 tilted as described above is provided with protrusions 132 protruding from the upper and lower surfaces thereof so as to be spaced apart between the two partition walls 121 and 122 of the fixing ring 120. The tilting of the 130 is guided to be performed smoothly while preventing the tilting of the pad 130 being tilted.

On the other hand, the tilting bearing according to the present invention configured as described above is installed in the feed water boost pump.

That is, the bearing 100 is inserted into the shaft journal of the booster pump is inserted therein, the bearing is coupled to the shaft is installed so that the stationary ring 120 with the discharge hole 123 is located to the lower side To support the shaft.

When the shaft coupled to the bearing 100 is operated as described above, the shaft is operated at 1800 rpm, and vibrations are generated. A plurality of pads 130, which are in contact with the vibration of the shaft, are in the trunk 110 of the bearing 100. Tilting at will absorb all of the vibrations.

In particular, the tilting direction of the pad 130 tilted as described above may effectively absorb the vibration of the shaft by acting not only in the circumferential direction of the bearing 100 but also in all directions of 360 degrees including the axial direction.

Therefore, the vibration of the shaft is absorbed by the tilting pad 130 as described above, thereby preventing or minimizing wear between the shaft and the bearing 100, thereby preventing or minimizing the wear of other peripheral devices connected thereto. Will be.

In addition, when the shaft is rotated as described above, oil is supplied through the inlet hole 112 perforated in the body 110 of the bearing 100, so that the body 110 and the pad 130, the shaft, the stationary ring 120 And after lubricating the bearing 100 and the shaft while circulating the oil passage 124 thereof, through the discharge hole 123 of the stationary ring 120 located in the lower portion of the bearing 100 to the outside of the bearing 100 Discharged.

Hereinafter, the analysis results in which the applicant has asked the Korea Institute of Machinery and Materials to analyze the overall performance of the tilting bearing of the present invention.

5 is an analysis result analysis of the overall performance of the tilting bearing according to the present invention, Figure 5a is a view showing the type of bearing, Figure 5b is a view showing the pressure distribution acting on the bearing, Figure 5c And FIG. 5D is a graph showing the rigidity and damping coefficient of the bearing, FIG. 5E is a graph showing the bending mode and the swing natural frequency of the bearing, and FIG. 5F is a graph showing the unbalanced vibration level.

First, Figure 5a shows the form of the tilting bearing of the present invention, the bearing is a bearing having five pads acting on the load of the shaft, to improve the effects of vibration and housing thermal deformation, self-aligned pad and It has a tilting pad with pivot function.

And, Figure 5b shows the pressure distribution acting on the bearing, it can be seen that when the full load is applied to the two pads located on the upper side, a fairly large pressure is generated, resulting in a uniform pressure distribution of the bearing It can be seen that it is even more stable because it acts evenly.

5C and 5D are graphs showing the stiffness and the damping coefficient of the bearing, respectively. In the conventional bearings (Overshot Groove Elliptical Bearings), the direct stiffness of K _XX = 8.009 × 10 ⁶ N / m and K _YY = 1.685 × The large asymmetry is shown in the small value of 10 ⁷ N / m, and the cross-coupled stiffness is very large, comparable to the direct stiffness.

On the other hand, the improved tilting bearing of the present invention is very well symmetrical to the large values of direct stiffness K _XX = 1.657 × 10 ⁸ N / m and K _YY = 1.697 × 10 ⁸ N / m, and cross-coupled stiffness. Is substantially zero.

Therefore, as can be seen from above, the tilting bearing of the present invention has a direct rigidity of about 10 times or more as compared with the conventional bearing.

5E is a graph showing the bending mode and the swing natural frequency of the bearing. As shown in the graph, the natural frequency of the bearing is 5264.7 rpm, and the direct rigidity of the bearing is sufficiently strong so that the bearing position is the nodal position, that is, the bearing. The oscillation at is likely to be very slight.

5F is a graph showing the unbalanced vibration level of the bearing (G2.5 imbalance is added to the impeller, based on 1800 rpm), and it is expected that unbalanced vibration of 5.05 μm in the impeller and 0.25 μm in two bearing positions will occur. It is expected that the vibration will be significantly reduced by 1/2 times in the impeller and 1/31 times in both bearing positions compared to conventional bearings. This is because the direct rigidity of the bearing is about 10 times so that the bearing can be better constrained to prevent the shaft from vibrating.

Therefore, when analyzing the analysis results of the tilting bearing invented as part of solving the vibration problem of the feed-up boost pump, as follows.

The tilted bearings of the present invention were well loaded with pressure generation on all pads and exhibited a uniform distribution throughout. In particular, the direct stiffness coefficient is symmetrical in the vertical and horizontal directions and has a very large value, and the cross-coupled stiffness is considered to be excellent in terms of dynamic characteristics.

In addition, the direct stiffness coefficient of the tilting bearing of the present invention was also analyzed to be 10 times higher than existing bearings.

In particular, as a result of the unbalanced vibration response analysis, the vibration level of the rotor at the bearing position was reduced by 1/31 times compared with the existing bearings for the same unbalanced amount. In addition, the vibration level in the impeller was also interpreted to be reduced by half.

As described above, it is evaluated that the design application of a tilting bearing with a self-aligning pad and pivot function is suitable in terms of vibration reduction due to unbalance and housing deformation.

As described above, according to the tilting bearing of the present invention, the vibration of the rotating shaft is absorbed by a plurality of pads tilted in the bearing, thereby preventing or minimizing the wear of the shaft, the bearing, or peripheral devices connected thereto. There is this.

Claims (5)

A body into which the shaft is inserted and supported; A pad installed on the body and having one surface in contact with an axis and the other surface of which is formed with a protruding round protrusion formed on the body and tilted; It is configured to include; and a stationary ring for restraining while guiding the pad is installed and respectively tilted at the end of the body, The fixed ring is a tilting bearing, characterized in that the position fixing hole which is coupled to the position fixing projections protruding in the body to be fixed to the body further formed. The method of claim 1, Tilting bearing, characterized in that the groove is formed in the inner circumferential surface of the body corresponding to the circular protrusion of the pad is inserted and supported. The method of claim 2, The groove of the body is formed as a regular groove, the tilting bearing, characterized in that the protruding portion of the pad protrudes larger than the groove of the body. The method according to any one of claims 1 to 3, Tilting bearing, characterized in that the at least one stationary ring of the bearing is perforated with a discharge hole for circulating the discharged oil supplied into the bearing. delete

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