RU1803623C - Bearing unit with high temperature zone - Google Patents

Abstract

Use: for cooling bearings installed in devices operating in the high temperature zone. SUMMARY OF THE INVENTION: A bearing assembly with a high temperature zone comprises a housing with bearings mounted in it and on a shaft with an axial channel. A disc is disposed between the housing and the wall enclosing the high temperature zone to remove hot air from the housing. A shaft with a central hole for venting air is located in the axial channel of the shaft. On the outer surface of the rod there are screw grooves with a partition in the middle part. Radial channels are also provided in the shaft, communicating a helical groove with a central opening for venting air. Radial channels are made in the shaft to connect the helical groove to the compressed air source. When the bearing unit is in operation, a large volume of air passes in the bearing area and intense heat transfer occurs. 1 C.p. f-ls, 2 ill.

Description

The invention relates to devices operating in the high temperature zone, and can be used in engineering, chemical, metallurgical and other industries.

The purpose of the invention is to increase the reliability of the assembly.

This goal is achieved by the fact that the housing with bearings is mounted outside the wall enclosing the high temperature zone and is separated by means of a disc placed on the shaft between the housing with bearings and the wall of the disk to exhaust hot air from the housing. The cooling means is made in the form of a rod located in a blind axial channel and rigidly connected to it with a central hole for air exhaust with screw grooves located on its outer surface, made against the direction of rotation of the shaft and separating the said helical grooves in the middle of the shaft between the zone the placement of the bearings and the disk by a partition, as well as with radial channels made between the said partition and the area of bearing placement, communicating the helical groove in the e locating bearings with a central opening for air outlet. Radial channels are made in the shaft in the area between the disk and the baffle for connecting the helical groove between the bearing housing and the high temperature zone with a compressed air source.

The bottom of the blind axial channel is made on the side of the wall enclosing the high temperature zone, with a smaller diameter recess for communicating the screw groove with the central hole for air exhaust. In addition, the disk and part of the shaft in the area of the wall enclosing the zone of high tempera

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made with heat-insulating coating.

In FIG. 1 shows the proposed device; in FIG. 2 is a section AA in FIG. 1.

The device comprises a housing 1 mounted on supports 2, mounted on the base 3 of the wall enclosing the high temperature zone. In the housing 1, a shaft 4 with a blind axial channel is mounted on bearings 5, fixed by covers 6 and 7. Inside the shaft 4, a rod 8 is pressed in, on which there are screw grooves 9 and 10 overlapped in the middle by a partition. 11 located between the bearing area and the disc. In the lower part of the rod 8, the screw grooves 10 are connected to the cavity 12 by the compressed air through radial channels 13 on the shaft and the central exhaust holes 15 by means of the cavity 14. In the upper part of the rod 8, the screw grooves 9 of the atmospheric air supply are connected to the central hole 15 by means of radial channels 16. A disk 17 with a heat-insulating coating 18 mounted above a cup 19 fixed to the base 3 is fixed on the shaft 4, the outer side of which is smaller in height than the inner one.

The lower part of the shaft 4, located in the high temperature zone, is made with a heat-insulating coating 20.

The device operates as follows.

Compressed air coming from the cavity 12 through the radial channels 13 of the shaft 4 and the screw grooves 10 of the lower part of the rod 8 is supplied to the cavity 14 located in the high temperature zone and interacting with the inner surface of the shaft 4 by heat exchange, it is cooled, and then central hole 15 goes into the atmosphere. Due to the high-speed pressure in the central hole 15, there is a local decrease in pressure in the radial channels 15 of the rod 8 and air is sucked from the atmosphere through the screw grooves 9. In addition, the screw grooves 9, made against the direction of rotation of the shaft, create additional pressure, creating atmospheric air, creating an increased the pressure in the radial channels 16. As a result, a large volume of air passes in the area of the bearings w, thereby intensifying heat transfer, the Disk 17 is used to remove hot air from the housing 1, coming in through a gap between the shaft 4 and the base 3, and the thermal insulation coating reduces the heating of the shaft from the upward flow of air from the high temperature zone.

Claims (2)

1. Bearing unit with high area temperature, comprising a shaft with a blind axial channel, a housing with bearings mounted in it and on the shaft, means for cooling and a wall enclosing the high temperature zone, characterized in that, in order to increase the reliability of operation, the housing with bearings is mounted outside the enclosing wall high temperature zone and is separated by means of the housing located on the shaft between bearings and the wall of the disk for the removal of hot air from the housing, the cooling means is made in the form of a rod located in a blind axial channel and rigidly connected to it with a central a hole for venting air with screw grooves located on its outer surface, made against the direction of rotation of the shaft and dividing the aforementioned screw grooves in the middle part of the rod, between the bearing placement area and the disk, the baffle, and also made between the baffle plate and the placement area bearings radial channels, communicating a helical groove in the area of bearings with a central hole for venting, in the shaft in the area between the disk and the partition there are radial channels for connecting a helical groove between the bearing area and the high temperature zone with a compressed air source, the bottom of the blind axial channel is made from the side of the wall enclosing the high temperature zone with a smaller recess for communicating the helical groove with a central air exhaust opening. 2. The bearing assembly according to claim 1, with the condition that the disk and part of the shaft in the area of the wall enclosing the high temperature zone are made with a heat-insulating coating. Aa Fi g. 2