RU170012U1 - AXIAL GAS DYNAMIC BEARING - Google Patents

Abstract

The utility model relates to mechanical engineering, in particular to sliding bearings with liquid and gas lubricants used in rotor bearings of high-speed turbomachines for various purposes. The objective of the claimed utility model is to increase the bearing capacity of the bearing. An axial gas-dynamic gas-dynamic bearing comprises a thrust disk 2, housing 1. Between the disk 2 and the housing 1 there is a plate 3. Between the plate 3 and the thrust disk 2 there are elastic petals 4 of a thin metal tape supporting the thrust disk 2. The petals 4 are fixed with one edge on the supporting elements 5. Between each petal 4 and the board 3 are leaf springs 8 supporting the petal 4.

Description

The technical field to which the utility model belongs.

The utility model relates to mechanical engineering, in particular to sliding bearings with liquid and gas lubricants used in rotor bearings of high-speed turbomachines for various purposes.

The level of technology.

Known axial flap gas-dynamic bearing (patent No. 2137954). The bearing comprises a board with supporting elements mounted on it, located in the circumferential direction, overlapping elastic petals made of a thin metal tape and fixed at one edge to the supporting elements. The other edge of each petal rests on a neighboring petal. The lower part of the petal rests on a spring. The spring is a curved plate resting on the board with its edges and fixed to the board in the zone of overlap of the petals.

The disadvantage of this bearing is the limited bearing capacity for large diameter bearings, when the circumferential length between adjacent petals is large enough. In this case, the size of the part of the petal, which is not supported from below by the spring, increases, this part bends significantly more than the supported part of the petal, which leads to a decrease in the bearing capacity of the bearing.

Disclosure of a utility model.

The technical result, to which the utility model is directed, is to increase the bearing capacity of the bearing.

The specified technical result is achieved in that the gas-dynamic bearing includes a thrust disk, a housing, an annular plate with supporting elements fixed in it, located in the circumferential direction, elastic petals, each of which is fixed at one end to a corresponding supporting element, where between the elastic lobe and the plate two or more leaf springs mounted on the board are located in a circumferential direction, supporting the petal and made in the form of separate curved plates and supported by their and edges on the board.

A brief description of the drawings.

In FIG. Figures 1 and 2 show plan views of an axial blade gas-dynamic bearing.

In FIG. Figure 3 shows a cross section of a circular gas-dynamic bearing in a circumferential direction.

Implementation of a utility model.

Shown in FIG. 1, the bearing comprises a housing 1, a partially shown thrust disk 2, which is part of the rotor. An annular board 3 is located between the thrust disk 2 and the housing 1. The axis of the board coincides with the axis of the rotor. The circuit board 3 is mounted on the housing 1 and is held relative to the housing 1 using pins 6 located in the recesses of the circuit board 3 and fixed in the holes of the housing 1. Between the circuit board 3 and the thrust disk 2, elastic petals 4 supporting the thrust disk 2 are located in the circumferential direction. Petals 4 made of thin metal tape.

Figure 2 presents a view of the bearing in plan. Part of the petals 4 is not shown. On the circuit board 3, support elements 5 are mounted in a circumferential direction, made of a thin metal strip and fastened to the circuit board 3 by welding. Each petal 4 is fixed by one edge to the corresponding support element 5 by welding.

Between each petal 4 and the circuit board 3 (Fig. 2, 3), three leaf springs 8 of arch type are located in the circumferential direction, supporting the petal 4. The number of such springs on which each petal rests can be at least two. The maximum number of springs can reach ten or more. The springs 8 are mounted on the board 3. The springs 8 are supported by their edges located radially on the board 3 and fixed to the board 3 by welding. The petal 4 rests axially on the convex parts of the springs 8.

When the thrust disk 2 rotates, the surface of the disk moves in the direction of the arrow 10. Due to the viscous forces, air is drawn into the confuser gap 12 and creates an excess pressure between the thrust disk 2 and the tab 4. Due to this excess pressure at a sufficient speed, the axial load on the bearing is transferred from thrust disk 2 through the air layer in the gap 12 to the petal 4, then through the springs 8 to the board 3 and the housing 1. The lack of contact between the disk 2 and the petals 4 at the working speed of the disk ensures the operation of the bearing without wear and tear.

When the load on the bearing increases, the load is transferred from the lobe 4 to the board 3 through all three springs 8. Moreover, the presence of several springs 8 in the circumferential direction provides the optimal shape of the gap 12 necessary to prevent contact between the lobe 4 and the disk 2 and to achieve high bearing capacity .

Claims (1)

 An axial gas-dynamic gas-dynamic bearing comprising a thrust disk, a housing, an annular plate with supporting elements mounted in it in a circumferential direction, elastic petals located in a circular direction, each of which is fixed at one end to a corresponding supporting element, where between the elastic petal and the plate two or more leaf springs mounted on the board are located in a circumferential direction, supporting the petal, made in the form of separate curved plates and resting on their edges and for a fee.

Images