SU646068A1 - Cooling turbine shaft bearing - Google Patents

Description

(54) SHAWNER SHAFT

. . - 1 The invention relates to turbomachines, in particular, to the turbo-refrigerators of air conditioning systems. Turbo-coolers are known in which the shaft supports contain ball and roller bearings, and an oil supply device with end-arranged rows of nozzles for supplying lubricant to the annular gaps between the separators and bearing rings 1. A disadvantage of the known devices is the occurrence of high concentrations and locations in high specific areas pressures between the separator and roller bearing elements, and the efficiency of the oil supply to the contact points. The aim of the invention is to increase operational reliability. The goal is achieved by the fact that the separator has windows located at the level of the axes of the bearing rollers and the openings between the rollers provided with the overflow channels, forming the outer and BHyrpeifnie end lugs, with the centers of the windows, openings and overflow channels located on a common circle. The cylindrical surfaces of the outer protrusions in contact with each roller of the bearing are made with radii, the centers of which lie inside the common circle, and the surfaces of the internal projections with radii whose centers lie outside the common circle. FIG. 1 shows a turbo-cooler, a longitudinal section; in fig. 2 shows the bearings of the turbo-cooler shaft, a longitudinal section; in fig. 3 shows a section along A-A in FIG. 2. The support shaft of the turbo-cooler contains ball i and roller 2. bearings, oil supply device 3. with concentrically placed rows of nozzles 4. Ball 1 and roller 2 bearings contain cages 5 and 6 respectively. In the separator 6 roller 2 bearings there are windows 7 at the level of the axes of the hollow rollers 8 of the bearing 2, as well as the sabzheinny overflow channels 9 openings 10, between the rollers 8, forming the outer 11 and inner 12 end protrusions. The centers of the windows 7, openings 10 and transfer channels 9 are placed on a common circle 13. The outer 11 and inner 12 end protrusions

have, respectively, cylindrical surfaces 14 and 15, which are in contact with the rollers 8, are made along radii 16. The centers of the radii of the cylindrical surfaces 14 lie inside a common circle 13, the centers of the radii of the cylindrical surfaces form a common circle 13.

During operation, the oil jets from the end-arranged nozzles 4 of the oil supply device 3 are guided into the annular gaps between the separators 5 and 6 and the bearing rings G and 2. The oil from the nozzles 4 is also fed through the holes in the rollers 8 and the openings 10 between them are roller bearings 2, reliably lubricate the rollers 8 And the cylindrical surfaces 14 and 15 in contact with them of the end protrusions 11 and 12, and each roller 8 is intensively cooled 8 is one of the most loaded elements. The 8 kong rollers are clocked with the separator b at the same time on the end protrusions 11 and 12 and are held by the latter at a minimum distance from each other, which allows an increase in the number of rollers 8. The presence of openings W improves the word for oil flow between the rollers inside the jDJDjpnik. The heated oil from the cavities of the rollers 8 and the openings 10 flows out through the rings of the separator 6, and the rings of the roller bearing 2, through the windows 7 and through the overflow channels 9, and is directed to the turbo-id hydraulic case, where it cools and goes back to the oil supply unit.

The use of this support in turbo-hrlodilas allows to increase their operational reliability and durability by improving lubrication and cooling of liners, as well as by reducing contact stresses and specific distances in bearing components.

646068

The roller bearing design of this shaft support is a turbo-cooler, which increases the number of rollers in this bearing by compared with the known roller bearing designs, which allows to reduce the specific pressure and contact stresses of the rolling tracks and rolling elements. This results in reduced wear and heat generation, increasing bearing performance factors.

invention formula

Claims (2)

1.Tubular shaft support for a turbo chiller containing ball and roller bearings and an oil supply device with concentric rows of nozzles — for feeding the lubricant into the annular gaps between the separators and bearing rings, which differs from Tenf, which, in order to increase operational reliability, the separator has windows located at the axle level of the bearing rabliks and fitted overflow channels are openings between the rollers, forming the outer and inner face protrusions; Moreover, the centers of the windows, openings and overflow channels are located on the common neighborhood of HbCtH; -. : 2. A support according to claim 1, characterized in that the contact with each bearing roller is a cylindrical external noBepxaoctH the protrusions are made with radii whose centers lie inside a common circle, and the surfaces of the internal protrusions are made with radii whose centers lie outside the common surface., Sources of information taken into account in the examination 1. USSR author's certificate No. 153845, cl. F 25 V 11/00, 196E.