JPS6227249B2 - - Google Patents

Abstract

PURPOSE:To eliminate the provision of a movable part and reduce a rate of trouble in a device while facilitate its maintenance work, by constituting the device such that an ejector is provided to a bearing part and operated by exhaust gas or the like to feed lubricating oil to the bearing part. CONSTITUTION:To start a Diesel engine, a starting air tank 31 is opened to feed pressure air to a cylinder and operate the engine. The air flowing in a starting air passage 18 partly flows in through a branch pipe 20 and a communication pipe 20 to an ejector 15 and is jetted from a jet nozzle 13, and lubricating oil O in a tank 22 is sucked by a suction pipe 14 and fed to a bearing part 12. An output of the engine is increased, if a lay shift 29 of a fuel pump 28 presses a limit switch 30, a selector valve 27 is switched to communicate a branch pipe 19 to the pipe 21, and exhaust gas flowing in an exhaust gas passage 17 partly flows in the nozzle 13 to operate the ejector 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lubricating device for supplying lubricating oil to a bearing of an exhaust turbine supercharger installed in an internal combustion engine such as a diesel engine.

Lubricating the bearing part of the exhaust turbine turbocharger,
Conventionally, the lubrication pump 2 is attached to the rotor shaft 1 as shown in Fig. 1, but it is necessary to attach the lubrication pump 2 to the rotor shaft 1 with a centering accuracy of 0.03 mm or less, and if this is not done. There is a risk of a breakage accident of the pump shaft, and because it is mechanical and has moving parts, it is prone to failure.

The present invention provides an ejector that generates suction force in a suction pipe by vigorously ejecting gas from an ejection nozzle, with its ejector facing the bearing part, and a starting air passageway at the root end of the ejection nozzle of the ejector. A branch pipe branched from the starting air passage is connected to a branch pipe branched from a gas passage having an operating pressure gradient such as an exhaust gas passage or an air supply passage, and a valve is attached to the branch pipe branched from the starting air passage. At the same time, by connecting a lubricating oil tank to the root end of the suction pipe,
It is an object of the present invention to provide a lubricating device for a bearing in an exhaust turbine supercharger that solves the above-mentioned conventional problems, is easy to install, and has fewer failures. The present invention will be described in detail below with reference to the drawings.

FIG. 2 shows an embodiment of the present invention, in which a rotor shaft 10 includes an exhaust turbine and a blower (both not shown), and is rotatably supported by a bearing portion 12 of a casing 11 in a well-known manner. ing. On the right side of the casing 11 in FIG.
An ejector 15 that generates a suction force is provided so that the tip of an oil supply pipe 16 connected to the jet nozzle 13 is directed toward the bearing section 12 .

The root end of the ejection nozzle 13 of the ejector 15 is connected to a branch pipe 20 branched from the starting air passage 18.
and a branch pipe 19 branched from the exhaust gas passage 17.
The suction tube 14 is connected through a communication pipe 21 to the suction pipe 14 and is operated by the action of gas flowing into the communication pipe 21 from the passages 17 and 18, and has its proximal end inserted into the lubricating oil tank 22. The lubricating oil O in the lubricating oil tank 22 is sucked up, and the lubricating oil O is sent to the bearing portion 12 through the lubricating pipe 16. Note that, in addition to the exhaust gas passage 17, there is an air supply passage for a blower as a gas passage having an operating pressure gradient for operating the ejector 15.

Each of the branch pipes 19 and 20 has a pressure reducing valve 2.
3, 24 and check valves 25, 26 are incorporated, and a switching valve 27 for selectively communicating between the branch pipes 19, 20 and the communication pipe 21 is provided at the connection portion between the branch pipes 19, 20 and the communication pipe 21. It is provided. This switching valve 27
is connected to the limit switch 30, which is turned on and off by the ray shaft 29 of the fuel pump 28. When the ray shaft 29 of the fuel pump 28 moves to the left in FIG. 2 and the output of the diesel engine exceeds a predetermined value, the limit switch 30 When the engine enters the engine, the switching valve 27 is switched, and the ejector 15, which had been operated by the air flowing from the starting air tank 31, is now operated by the exhaust gas from the diesel engine.

Reference numeral 32 denotes a cover plate which covers the bearing part 12 and is attached to the casing 11 with screws 33, and the oil supply pipe 16 passes through this cover plate 32 and projects its tip into the bearing part 12. 34 is a lubricating oil circulation pipe that connects the inside of the casing 11 to the lubricating oil tank 22.

Next, the operation of the oil filling device according to the present invention configured as described above will be explained.

To start a diesel engine, the starting air tank 31 is opened in the usual manner and pressurized air is delivered to the cylinders to start the engine. At this time, part of the air flowing into the starting air passage 18 is transferred to the branch pipe 20.
The lubricating oil O flows through the communication pipe 21 to the ejector 15, is vigorously jetted out from the jet nozzle 13, sucks up the lubricating oil O in the tank 22 through the suction pipe 14, and sends it to the bearing section 12. When the output of the engine increases and the ray shaft 29 of the fuel pump 28 presses the limit switch 30, the switching valve 27 switches and connects the branch pipe 19 to the communication pipe 21, so that the exhaust gas flowing through the exhaust gas passage 17 is A part of the liquid flows to the jet nozzle 13 and operates the ejector 15.
Note that, at this time, the starting air tank 31 is automatically or manually closed.

In the above, the starting air passage 18 and the exhaust gas passage 17 are connected to the ejector 1 through branch pipes 19 and 20.
Example in which the operating gas for the ejector 15 is switched by operating a switching valve 27 provided at the connecting portion of the branch pipe and the communication pipe 21 in conjunction with the operation of the ray shaft 29 of the fuel pump 28. However, the usage form of gas having an operating pressure gradient, switching control, etc. are not limited to the above. For example, the switching valve 27 uses the pressure of the exhaust gas passage 17 to increase the pressure to a predetermined value or more. It may be possible to switch the switch when the user gets tired, and the switch valve 27
The branch pipe 20 is not provided at the connecting portion between the two branch pipes 19 and 20 and the communication pipe 21, but is provided between the branch pipe 20 on the starting air passage side and the pressure reducing valve 24.
It may also be provided as a valve that communicates and shuts off the communication. In this case, the check valve 26 on the branch pipe 20 side can be omitted.

As explained above, in the bearing lubricating device for the exhaust turbine supercharger according to the present invention, the ejector, which generates suction force in the suction pipe by vigorously jetting gas from the jet nozzle, connects the ejector to the bearing. A branch pipe branched from the starting air passage and a branch pipe branched from a gas passage having an operating pressure gradient, such as an exhaust gas passage or an air supply passage, are provided at the root end of the ejection nozzle of the ejector. A valve is attached to the branch pipe branched from the starting air passage, and a lubricating oil tank is connected to the root end of the suction pipe.
Unlike conventional lubrication pumps, the installation does not require strict precision, and it can be easily installed, and since it does not have moving parts, it is less likely to break down and is easy to maintain. Additionally, when the engine is started, a portion of the starting air used to start the engine is used to lubricate the bearings, and then, once the turbine starts operating, lubrication is carried out by utilizing the working pressure gradient of the gas that occurs during operation. Because it is continuous, it is possible to accurately supply sufficient lubricating oil to the bearings when starting an engine that requires reliable and large amounts of lubrication. Lubricating according to the rotational speed can be done efficiently and efficiently without using energy.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a conventional lubricating device, and FIG. 2 is a cross-sectional view showing an embodiment of the bearing lubricating device in an exhaust turbine supercharger according to the present invention. 12... bearing part, 13... jet nozzle, 14...
... Suction pipe, 15 ... Ejector, 17 ... Exhaust gas passage, 18 ... Starting air passage, 22 ... Lubricating oil tank.

Claims (1)

[Claims] 1 Ejector 1 that generates suction force in the suction pipe 14 by vigorously jetting gas from the jet nozzle 13
A branch pipe 2 branched from the starting air passage 18 is provided at the root end of the ejection nozzle 13 of the ejector 15, and a branch pipe 5 is provided with its ejection port facing the bearing portion 12.
0 is connected to a branch pipe 19 branched from a gas passage 17 having an operating pressure gradient such as an exhaust gas passage or an air supply passage, and a valve 27 is attached to the branch pipe 20 branched from the starting air passage 18. A lubricating device for a bearing in an exhaust turbine supercharger, characterized in that a lubricating oil tank 22 is connected to the root end of the suction pipe 14.