KR100972380B1 - Device for emergency lubrication - Google Patents

Abstract

In order to simply configure the device for emergency lubrication of the shaft bearing of the exhaust turbocharger upon interruption of the lubricating oil supply, a vertically arranged ring-shaped tube 2 is provided, connected to one or more lubricating oil supply lines 1, The supply pipe 4 for the turbine shaft bearing branches from below the ring-shaped pipe 2, and the supply pipe 5 for the compressor shaft bearing and the branch pipe 6 for the storage tank 7 branch from above. The branch pipe 6 has a transverse cross section 12 which is always open to the storage tank 7 and a check valve 8 which opens in the reverse flow direction from the storage tank 7 at the pressure drop in the ring-shaped pipe. .

Description

Emergency Lubrication Device {DEVICE FOR EMERGENCY LUBRICATION}

1 is a schematic diagram showing the configuration of a device according to the invention.

2 is a cross-sectional view of the check valve in the closed position.

3 is a cross-sectional view of the check valve in the open position.

Description of the Related Art

1, 4, 5: supply line

2: ring tube

3, 8: check valve

6: branch pipe

7: storage tank

9: valve disc

11: strip

12: transverse cross section

13: wall

14, 15: section

16: bottom

17: through hole                 

18: overflow pipe

19: cover

20: lubricant collection container

22: outflow cross section

23: hall

 The present invention relates to an apparatus for emergency lubrication of a shaft bearing of an exhaust turbocharger upon interruption of the lubricating oil supply.

It is an object of the present invention to provide an emergency lubrication device of simple construction which ensures sufficient lubrication of the shaft bearings in the event of a lubrication of the lubricant supply.

The subject is provided in accordance with the present invention is provided with a ring-shaped pipe connected to at least one lubricating oil supply pipe, arranged vertically, from which the supply pipe to the turbine shaft bearing is branched, from above the supply pipe to the compressor shaft bearing. And a branch to the storage tank is branched, which is solved by having a transverse cross section which is always open to the storage tank and a check valve which opens in the reverse flow direction from the storage tank under pressure drop in the ring-shaped pipe.

The present invention is characterized in that there is no movable member except the check valve. Nevertheless, not only is sufficient lubrication of the shaft bearings in the short-term interruption of normal lubrication, but also emergency lubrication is achieved even in the long-term interruption of lubrication by stopping the running wheel, and a strongly heated turbine shaft bearing emerges from the storage tank. It can be cooled by the residual amount of lubricating oil.

Preferably the storage tank is separated into two sections by a vertical wall, which sections are connected to each other by a passageway, and the conduit leading to the vented lubricating oil collection container extends in the section containing the branch pipe. As a result of the separation of the storage tank, an air cushion is formed during filling in the section where the duct is not extended, and since the air cushion reaches the lubricating oil pressure, the check valve opens when the normal lubrication stops, It first flows out into a ring-shaped tube.

Preferably the overflow tube extends near the cover of the storage tank. However, air bubbles may be discharged through the overflow tube during subsequent normal operation upon filling the storage tank. Thus, air bubbles may not particularly interfere with emergency lubrication.

Further features and advantages of the invention are set forth in the further dependent claims and the description of the embodiments with reference to the drawings.

The apparatus according to FIG. 1 is provided with two lubricant supply lines 1. The lubricating oil supply pipe 1 is led to the ring-shaped pipe 2. Each supply pipe 1 has a check valve 3 which allows the lubricant flow in the direction of arrow a in the normal lubricant supply. The ring tube 2 is arranged vertically. At the lowest point of the ring-shaped pipe 2, the supply pipe 4 to the turbine shaft bearing is branched. At the top of the ring tube 2 there is another feed tube 5 for the compressor shaft bearing. The shaft bearing is not shown in the figure. The shaft bearing is arranged at the bottom of the ring tube 2.

At the top of the ring tube 2 another branch tube 6 is branched, which branch tube 6 extends into a storage tank, generally designated 7 , arranged above the ring tube 2. A check valve, generally designated 8 , is inserted into the branch pipe 6. The check valve comprises a valve disc 9 as shown in FIGS. 2 and 3. The valve disc 9 is guided freely movable in the vertical direction. To this end, a plurality of L-shaped strips 11 are provided in the valve housing 10. In the valve disc 9 a passage cross section 12 which is always open is formed in the form of a hole. As an alternative, the transverse cross section can be formed as a bypass tube connecting the check valve 8.

The transverse cross section 12 is much smaller than the cross section of the branch pipe 6.

The storage tank 7 is separated into two sections 14, 15 by a vertical wall 13. A passage opening 17 is provided in the wall 13 just above the bottom 16 of the storage tank 7. The overflow tube 18 protrudes into the section 14 of the storage tank 7 and extends near the cover 19 of the storage tank 7. The other end of the vortex tube 18 extends into the lubricating oil collection vessel 20, which is vented through the duct 21. A screen defining the outflow cross section 22 is mounted to the upper end of the vortex tube 18. The passing cross section 12 is set larger than the outflow cross section 12. A hole 23 is formed in the branch pipe 6 just above the bottom 16 of the storage tank 7.                     

When the lubricating oil supply is connected, the lubricating oil is fed to the ring tube 2 through the feed pipe 1 and the open check valve 3 and to the shaft bearing from the ring pipe through the feed pipes 4 and 5. At the same time, lubricating oil is introduced into the storage tank 7 through the branch pipe 6 and the always open passage cross section 12. For this reason, the lubricating oil level in the storage tank 7 rises. In this rise of the lubricant level, the air in the section 15 is compressed together after the section 14 is completely filled. Air in section 14 exits through vortex 18. When the lubricating oil level reaches the upper end of the drift pipe 18, a part of the lubricating oil flows out through the drift pipe. However, because the outflow cross section 22 of the pipe is smaller than the cross section 12 of the check valve, the section 14 is completely filled with compressed lubricant. Lubricant entering the section 15 through the passage opening 17 likewise compresses the air at the top of the section. During this process the valve disc 9 of the check valve 8 is held in the closed position, as shown in FIG. 2 by the lubricating oil pressure at its lower surface.

When the lubricating oil supply is interrupted for a short time, the check valve 3 is closed. Thus, the pressure in the ring tube 2 and the pressure in the lower section of the branch pipe 6 drop. However, an air cushion in the section 15 of the storage tank 7 creates pressure on the upper part of the branch pipe 6 and thus on the upper surface of the valve disk 9, which pressures the valve disk in FIG. 3. Press to the position shown. In this position the valve disc lies in the lower L-shaped portion of the strip 11. Thus, the check valve is opened and lubricating oil flows into the ring pipe 2 and into the feed pipes 4 and 5 through the branch pipe 6 in the direction of the arrow b. As a result, the shaft bearing is lubricated during a short time interruption of the lubricating oil supply through the supply pipe 1.

If this lubricant supply does not start, the engine and thus the turbocharger are stopped after a few seconds. The storage tank 7 can be emptied completely. The lubricating oil substantially flows by gravity to the lowest point of the ring-shaped tube, from there through the feed tube 4 to the turbine shaft bearing. The turbine shaft bearing is subjected to a higher thermal load than the compressor shaft bearing. At the end of emptying the storage tank 7, the lubricant flows through the holes 23 and through the ring-shaped tube 2 and the feed tube 4 to the turbine shaft bearing to cool it.

In the application of the invention the storage tank 7 can be arranged directly above the housing of the exhaust turbocharger. As a result, a short pipeline and therefore a compact configuration for the branch pipe 6 and the overflow pipe 18 are obtained.

According to the present invention, it is possible to provide an emergency lubrication device of a simple configuration which ensures sufficient lubrication of the shaft bearing in the case of stopping the lubricating oil supply.

Claims (9)

An apparatus for emergency lubrication of a shaft bearing of an exhaust gas turbocharger upon interruption of lubricant supply, A ring-shaped tube 2 is provided which is connected to at least one lubricating oil supply tube 1 and arranged vertically, from which the feed tube 4 to the turbine shaft bearing is branched from below and the compressor shaft from above. The supply pipe 5 to the bearing and the branch pipe 6 to the storage tank 7 are branched, the branch pipe 6 having a passage cross section 12 which is always open to the storage tank 7 and a ring-shaped pipe. The emergency lubrication apparatus characterized by including the check valve (8) which opens in a counterflow direction from the storage tank (7) at the pressure drop in (2). The storage tank (7) according to claim 1, wherein the storage tank (7) is separated into two sections (14, 15) by a vertical wall (13), which sections are connected to each other by a passage opening (17), and the aerated lubricant collection. Emergency lubrication device, characterized in that the overflow pipe (18) leading to the vessel (20) extends in a section (14) containing the branch pipe (6). 3. Emergency lubrication device according to claim 1 or 2, characterized in that the storage tank (7) is arranged on top of the ring-shaped pipe (2). 3. Emergency lubrication device according to claim 2, characterized in that the overflow pipe (18) extends near the cover (19) of the storage tank (7). 3. The overflow tube (18) according to claim 2, wherein the overflow tube (18) ends near the cover (19) of the storage tank (7) and the outflow cross section (22) of the overflow tube (18) is smaller than the always open passage cross section (12). Emergency lubrication device, characterized in that set. 3. Emergency lubrication device according to claim 1 or 2, characterized in that the branch pipe (6) has a hole (23) just above the bottom of the storage tank (7). 3. Emergency lubrication device according to claim 1 or 2, characterized in that the check valve (8) comprises a valve disc (9) movably guided in the vertical direction. 8. Emergency lubrication device according to claim 7, characterized in that the always open passage cross section (12) is formed as a hole in the valve disc (9). 3. Emergency lubrication device according to claim 1 or 2, characterized in that the cross section of the branch pipe (6) is set larger than the always open passage cross section (12).

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