RU2320908C2 - Combined support with elastic elements - Google Patents

Abstract

FIELD: invention refers to field of machine building and may be used in highly loaded rotor machines.

SUBSTANCE: combining support has body and in-series located in it on shaft antifriction bearing and sliding bearing. External ring of antifriction bearing is installed in body with usage of elastic rings in such way that antifriction bearing may travel relatively to axis of shaft in radial direction under influence of external loadings. With increasing of frequency of rotating of shaft in channels of sliding bearing hydraulic static dynamic reaction appears reducing loading on antifriction bearing, as result redistribution of external loading takes place between antifriction bearing and sliding bearing.

EFFECT: increases resource and reliability of "rotor-support" system.

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Description

The invention relates to the field of engineering and can be used in highly loaded rotary machines, which are subject to increased requirements for speed and the possibility of multiple starts (stops) of the machine.

Known combined support [1], which is the closest in technical essence to the present invention, comprising a housing and a sliding bearing and a rolling bearing disposed therein. This combined support works as follows: during the start-up (shutdown) of the machine, the external load is transferred to the housing through the rolling bearing, in the main mode, overpressure appears in the channels of the hydrostatodynamic bearing and the external load is transferred to the housing through the rolling elements and the lubricating layer of the sliding bearing. Improving the working conditions and reliability of the support unit is achieved due to the fact that in the main mode of operation, the rolling bearing is unloaded, and the sliding bearing has a guaranteed radial clearance, which eliminates the main factors of its wear.

The main disadvantage of this design is that the position of the shaft in the sliding bearing remains constant due to the rigid placement of the rolling bearing in the housing. The consequence of this is the almost constant ratio of the separation of the external load between the rolling bearing and the sliding bearing, which depends on the load capacity of the latter, which does not take into account the influence of dynamic forces of imbalance and shock loads.

The problem to which the invention is directed, is to increase the life and reliability of the rotor - support system by more flexible separation and duplication of the functions of the rolling bearing and sliding bearing.

The problem is achieved in that in the combined support comprising a housing and a rolling bearing and a sliding bearing arranged sequentially on the shaft in the shaft, characterized in that the outer ring is mounted in the housing using elastic rings so that the rolling bearing can move relative to the shaft axis in in the radial direction under the action of external loads, while with an increase in the frequency of rotation of the shaft in the channels of the sliding bearing, a hydrostatodynamic reaction appears, reducing the load on the rolling bearing, resulting in a redistribution of the external load between the rolling bearing and the sliding bearing.

The invention is illustrated by the drawing, which shows a combined support. The combined support consists of a housing 1, in which a rolling bearing 2 is mounted by means of an elastic ring 3, a sliding bearing 4 and a shaft 5.

The device operates as follows: when the machine starts, the shaft 5 is rotated and the external load is transferred to the housing 1 through the rolling bearing 2 and the elastic ring 3. Depending on the forces acting on the rolling bearing 2, the elastic rings 3 are deformed and the shaft axis occupies a position in which there are no negative deformations of the shaft and parts of the rolling bearing, that is, the effect of self-installation is observed. With an increase in the rotational speed in the channels of the sliding bearing 4, a hydrostatodynamic reaction occurs and the external load is redistributed between the rolling bearing 2 and the sliding bearing 4. A decrease in the load on the rolling bearing 2 causes a decrease in the deformation of the elastic ring 3, and its rigidity can be chosen so that In the main operating mode, a load sharing mode close to optimal will be observed, that is, when the hydrostatodynamic force of the sliding bearing is close to Achen and opposite to the direction of the external load.

This device allows you to increase the reliability and durability of the support node due to the separation of the external load between the rolling bearing and the sliding bearing at various operating modes of highly loaded rotary machines.

Information sources

1. Combined support. The author's certificate of the Russian Federation No. 2073801, published on 02/20/1997 (Prototype).

Claims (1)

A combined support comprising a housing and a rolling bearing and a sliding bearing arranged sequentially on the shaft on the shaft, characterized in that the outer ring of the rolling bearing is installed in the housing using elastic rings so that the rolling bearing can radially move relative to the shaft axis under the action of external loads, while with an increase in the shaft rotation frequency in the channels of the sliding bearing, a hydrostatodynamic reaction appears, reducing the load on the rolling bearing, in as a result of which the external load is redistributed between the rolling bearing and the sliding bearing.