RU2588281C1 - Combined support with elastic elements - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention can be used in rotating, high-loaded rotor machines. Combination support includes housing and installed in it in series on shaft of rolling bearing, external ring of which is installed in housing by means of flexible rings so that bearing may move relative to shaft axis in radial direction under action of external loads, and sliding bearing. With increase in RPM in channels of sliding bearing there is hybrid reaction, reducing load on rolling bearing, as result of external load is redistributed between rolling bearing and journal bearing. On inner surface of casing piezoactuators are installed connected to voltage source and capable of as a result of own deformations to move movable shoes relative to shaft axis in axial direction.

EFFECT: higher reliability, durability, improved dynamic characteristics of rotor-support and reduced rotor vibration amplitude due to activation, deactivation of resilient rings by means of changing voltage supplied to piezoactuators.

1 cl, 2 dwg

Description

The invention relates to the field of engineering and can be used in fast-rotating, highly loaded rotary machines.

As a prototype of this technical solution, a combined support was selected, comprising a housing and a rolling bearing and a sliding bearing placed in series on the shaft, in which the outer ring of the rolling bearing is installed 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 I, which reduces the load on the rolling bearing, resulting in a redistribution of the external load between the rolling bearing and the sliding bearing (see RF patent No. 2320908, IPC F16C 21/00, published March 27, 2008).

The disadvantage of this support is the high oscillation amplitudes and large friction losses, as well as the lack of the ability to actively control the dynamic characteristics of the rotor-support system.

The technical problem that this invention solves is the improvement of the dynamic characteristics of the rotor-support system by turning on and off the elastic rings by changing the voltage supplied to the piezo actuators.

This object is achieved in that the combined support comprising a housing and a rolling bearing arranged sequentially on the shaft in the shaft, the outer ring of which is mounted in the housing using elastic rings so that the rolling bearing can move relative to the shaft axis in the radial direction under the action of external loads, and a sliding bearing, while with increasing shaft speed in the channels of the sliding bearing a hydrostatodynamic reaction appears, reducing the load on the bearing Achen, resulting in a redistribution of load between the outer rolling bearing and sliding bearing. According to the invention, piezoelectric actuators are installed on the inner surface of the housing, connected to a voltage source and capable of moving the movable blocks relative to the shaft axis in the axial direction as a result of their own deformations.

The technical result of the use of this device is to increase the reliability, durability, improve the dynamic characteristics of the rotor-support system and reduce the amplitude of the oscillations of the rotor by turning on and off the elastic rings by changing the voltage supplied to the piezo actuators.

In FIG. 1 shows a combined support, a longitudinal section with a fixed position of the rolling bearing in the radial direction relative to the axis of the shaft, FIG. 2 shows a combined support, a longitudinal section in the non-fixed position of the rolling bearing in the radial direction relative to the axis of the shaft.

The combined support comprises a housing 1 with a sliding bearing 2 installed in it, in which the neck of the shaft 3 is concentrically arranged. A rolling bearing 4 is concentrically mounted on the shaft 3, the inner race of which is fixedly mounted on the shaft 3, and the outer race is connected to the housing 1 through elastic rings 5 On the housing 1, piezoelectric actuators 6 are installed, connected to a power source 7, which drive the moving blocks 8, fixing the outer race of the rolling bearing 4.

The device operates as follows.

When starting (stopping) the machine, the shaft 3 is rotated and the load is transferred to the housing 1 through the rolling bearing 4, movable pads 8. The movable pads 8 are pressed against the outer race of the rolling bearing 4 using piezo actuators 6, to which voltage is supplied from the power source 7. C an increase in the frequency of rotation in the channels of the sliding bearing 2 a hydrostatodynamic reaction occurs and the redistribution of the external load between the rolling bearing 4 and the sliding bearing 2.

If an unacceptable vibration occurs during the operation of the combined support with the PC turned on, the movable blocks 8 under the action of their own deformations of the piezoelectric actuators 6 arising from the voltage drop supplied by the power source 7 are displaced in the axial direction, freeing the outer clip of the PC. In this case, the load from the shaft 3 to the housing 1 is transmitted through the rolling bearing 4, the elastic rings 5 and the sliding bearing 2. When the vibration level is reduced to acceptable values, all processes occur in the reverse order.

Claims (1)

A combined support comprising a housing and a rolling bearing arranged sequentially on the shaft in the shaft, the outer ring of which is mounted in the housing using elastic rings so that the rolling bearing can move relative to the shaft axis in the radial direction under the influence of external loads, and a sliding bearing, with an increase in the shaft rotation frequency, a hydrostatodynamic reaction appears in the channels of the sliding bearing, which reduces the load on the rolling bearing, as a result of which external load distribution between the rolling bearing and sliding bearing, characterized in that on the inner surface of the housing fitted pezoaktuatory connected to a voltage source and capable of resulting in the characteristic deformations move the movable block relative to the shaft axis in the axial direction.

Images