JP2009191794A - Hybrid exhaust turbine supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid exhaust turbine supercharger capable of reducing the manufacturing cost and the maintenance cost. <P>SOLUTION: In this hybrid exhaust turbine supercharger 1, a muffler 16 connected to an intake system of an internal combustion engine and supported by a casing 6 through a compressor 5 is provided on the upstream side of the compressor 5, and a shell housing 18 having a recessed part 18a inside thereof is provided in a central part of the muffler 16, and a generator 19 is housed in the recessed part 18a. The bottom part of the shell housing 18a is formed with an oil reservoir 23 storing lubricant, which dripped from the inside of the generator 19 after lubricating a bearing arranged inside of the generator 19, and the lubricant stored in the oil reservoir 23 is returned to an oil tank, which is arranged on the downstream side, through a lubricant discharge pipe 25 communicated with the oil reservoir 23 by gravity. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hybrid exhaust turbine supercharger, and more particularly to a hybrid exhaust turbine supercharger mounted on a marine internal combustion engine, an onshore generator internal combustion engine, or the like.

As such a hybrid exhaust turbine supercharger, one having a generator whose rotation shaft is connected to a turbine of a supercharger and a rotation shaft of a compressor is known (for example, see Patent Document 1). .
JP 2007-056790 A

  Now, in the hybrid exhaust turbine supercharger having such a configuration, it is compact and has a large amount of bearings (for example, sliding bearings) that support the rotating shaft of the generator that rotates at high speed (rotates at about 10,000 rpm). It is necessary to supply the lubricant. However, it is difficult to provide a space in which oil that has lubricated the bearings is dropped by gravity without increasing the size of the generator. For this reason, a lubricating oil circulation pump that can supply a large amount of lubricating oil to the bearing and a lubricating oil suction pump that sucks the lubricating oil after lubrication and returns it to the oil tank must be provided. There was a problem that the cost increased.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hybrid exhaust turbine supercharger capable of reducing manufacturing costs and maintenance and inspection costs.

In order to solve the above problems, the present invention employs the following means.
A hybrid exhaust turbine supercharger according to the present invention includes a turbine unit driven by exhaust gas guided from an internal combustion engine, a compressor unit driven by the turbine unit to pump outside air to the internal combustion engine, and these turbine units And a casing that supports the compressor section, and a silencer that is connected to the intake system of the internal combustion engine and supported by the casing via the compressor section is provided upstream of the compressor section. A hybrid exhaust turbine supercharger in which a shell housing having a recess therein is provided in a central portion of the silencer, and a generator is accommodated in the recess, the shell housing Lubricate the bearing arranged in the generator at the bottom of the generator and store the lubricating oil dripped from the generator Reservoir is formed, the lubricating oil accumulated in the oil reservoir through the lubricant discharge pipe communicating with the oil sump, the oil tank disposed on the downstream side, and is returned by gravity.

  According to the hybrid exhaust turbine supercharger according to the present invention, the lubricating oil that has lubricated the generator bearing and dropped into the oil reservoir passes through the lubricating oil discharge pipe to the oil tank only by gravity (naturally). Therefore, the conventionally required lubricating oil suction pump can be dispensed with, and the manufacturing costs and the maintenance and inspection costs can be reduced.

  The internal combustion engine according to the present invention includes a hybrid exhaust turbine supercharger capable of reducing the manufacturing cost and the maintenance and inspection cost. Therefore, the manufacturing cost and the maintenance and inspection cost of the entire internal combustion engine can be reduced. Can be planned.

  According to the present invention, the manufacturing cost and the maintenance inspection cost can be reduced.

Hereinafter, an embodiment of a hybrid exhaust turbine supercharger according to the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIGS. 1 and 2, a hybrid exhaust turbine supercharger 1 according to this embodiment includes an exhaust gas (combustion gas) 2 guided from an internal combustion engine (for example, a diesel engine or a gas turbine engine) (not shown). A turbine unit 3 driven by the turbine unit 3, a compressor unit 5 driven by the turbine unit 3 to pump outside air 4 to the internal combustion engine, and provided between the turbine unit 3 and the compressor unit 5 to support them. The main component is a casing 6 and a generator 19 having a rotating shaft 19 a connected to the rotating shaft 7 of the turbine section 3 and the compressor section 5 via a flexible coupling 21.

A rotating shaft 7 having one end protruding toward the turbine section 3 and the other end protruding toward the compressor section 5 is inserted into the casing 6. The rotary shaft 7 is supported by a bearing 8 provided in the casing 6 so as to be rotatable about an axis. The casing 6 is provided with a lubricating oil supply passage 9 for supplying lubricating oil from an oil tank (lubricant reservoir) (not shown) to the bearing 8.
On the other hand, the lower end portion of the casing 6 supports the casing 6 at one point in the axial direction of the rotating shaft 7 (may be supported at two or more points in a direction orthogonal to the axial direction of the rotating shaft 7). The leg portion 6a is fixed to a base (not shown) installed on the floor surface. That is, the weight of the hybrid exhaust turbine supercharger 1 is transmitted to the base via the leg portion 6a.
In the figure, the symbol P is a punching plate. The punching plate P has one end fixed to the lower end of the turbine section 3 and the other end fixed to the base in the same manner as the leg 6 a of the casing 6. The punching plate P is not mainly intended to support the weight of the hybrid exhaust turbine supercharger 1 like the leg portion 6a. The hybrid exhaust turbine supercharger 1 is connected to the base. The main purpose is to prevent the occurrence of thermal stress by receiving thermal expansion in the axial direction of the casing 6 while avoiding shaking (vibration).

The turbine section 3 is connected to an exhaust system of the internal combustion engine and receives an exhaust gas passage 10 to which at least a part of the exhaust gas 2 is supplied, and a flow of the exhaust gas 2 supplied into the exhaust gas passage 10. And a turbine 11 that is rotationally driven.
The turbine 11 includes a turbine rotor 12 and a turbine nozzle 13. The turbine rotor 12 includes a disc-shaped turbine disk 12a provided at one end of the rotary shaft 7, and a plurality of turbine blades having an airfoil cross section attached on the outer periphery of the turbine disk 12a. 12b.
The turbine nozzle 13 is configured by annularly arranging a plurality of nozzle guide vanes 13a, and is disposed upstream of the turbine blade 12b.

  The exhaust gas passage 10 is connected to the exhaust system of the internal combustion engine, and is provided toward the nozzle guide vane 13a and the turbine blade 12b to guide the exhaust gas 2 to the radially outer side of the turbine 11. And a delivery path 10b for guiding the exhaust gas 2 that has passed through the turbine 11 to the outside of the system, or to an exhaust gas purification device, an exhaust gas boiler, etc. (not shown).

The compressor unit 5 is rotationally driven to send the outside air 4 radially outward, and the spiral chamber that surrounds the compressor impeller 14 and compresses the outside air 4 sent by the compressor impeller 14. 15.
The compressor impeller 14 is attached to the other end of the rotary shaft 7 and has a substantially disc-shaped hub 14a. The compressor impeller 14 extends radially outward from the outer surface of the hub 14a, and is provided annularly along the circumferential direction. And a plurality of blades 14b.
A silencer (silencer) 16 connected to the intake system of the internal combustion engine is disposed adjacent to the upstream side of the compressor unit 5, and the outside air 4 that has passed through the silencer 16 passes through the inflow passage 17 to the compressor. It is guided to the blade 14 b of the impeller 14. Further, an intercooler, a surge tank, etc. (not shown) are provided on the downstream side of the compressor unit 5, and the outside air 4 that has passed through the spiral chamber 15 passes through the intercooler, the surge tank, etc., and then the internal combustion engine. To be supplied.

A shell housing 18 having a recess 18a formed so as to taper toward the end surface of the hub 14a is provided in the center portion of the silencer 16, and in the recess 18a, A (high speed induction) generator 19 is accommodated. The shell housing 18 is fixed to the compressor unit 5 (the radially outer wall surface forming the inflow path 17) via a plurality of (for example, four) supports 20 provided in the inflow path 17. The outer surface of the shell housing 18 constitutes a radially inner wall surface that forms the inflow path 17.
The generator 19 is disposed such that the rotation shaft 19a is positioned on the same rotation axis as the rotation shaft 7 described above, and the rotation shaft 19a passes through the hub 14a and faces the silencer 16 side. The end of one end of the protruding rotating shaft 7 is connected via a coupling 21. That is, the rotating shaft 19 a of the generator 19 rotates with the rotating shaft 7.

As shown in FIG. 1, the top (upper) back side (right side in FIG. 1) and front (left end face in FIG. 1) upper part of the shell housing 18 of the hybrid exhaust turbine supercharger 1 according to this embodiment. Each has a lubricating oil inlet (not shown) for guiding lubricating oil to a bearing (for example, a sliding bearing) of a generator 19 (not shown) accommodated in the recess 18. One end of a lubricating oil supply pipe 22 having a lubricating oil circulation pump (not shown) is connected in the middle thereof.
In addition, a lubricating oil outlet 24 that guides lubricating oil (not shown) accumulated in an oil reservoir 23 (described later) to the outside is provided at the front bottom portion (lower part) of the shell housing 18. A lubricating oil discharge pipe 25 is connected to guide the discharged lubricating oil to the oil tank described above.
The other end of the lubricating oil supply pipe 22 is connected to the bottom (lower part) of the oil tank, and the lubricating oil stored in the oil tank is pumped into the lubricating oil supply pipe 22 by a lubricating oil circulation pump. After the bearing of the generator 19 is lubricated, it is returned to the oil tank through the oil reservoir 23 and the lubricating oil discharge pipe 25.

  The oil sump 23 extends in the longitudinal direction (left and right direction in FIG. 1) of the shell housing 18 and is a space having a substantially isosceles trapezoidal shape in cross section as shown in FIG. (Lower part).

  According to the hybrid exhaust turbine supercharger 1 according to the present embodiment, the lubricating oil that has lubricated the bearings of the generator 19 and dropped onto the oil reservoir 23 passes through the lubricating oil outlet 24 to the oil tank only by gravity. Since it is returned (naturally), the conventionally required lubricating oil suction pump can be dispensed with, and the manufacturing cost and the maintenance and inspection cost can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified and changed as necessary without departing from the technical idea of the present invention.
For example, in the above-described embodiment, the other end of the lubricating oil supply pipe 22 is directly connected to the oil tank, but the other end of the lubricating oil supply pipe 22 communicates the oil tank and the lubricating oil supply path 9. It may be connected to a lubricating oil supply pipe (not shown).
Thereby, the lubricating oil circulation pump connected in the middle of the lubricating oil supply pipe 22 can be made unnecessary, and the manufacturing cost and the maintenance and inspection cost can be further reduced.

1 is a longitudinal sectional view of a hybrid exhaust turbine supercharger according to an embodiment of the present invention. FIG. 2 is a partially cut perspective view of the hybrid exhaust turbine supercharger shown in FIG. 1 viewed from the silencer side. (A) is AA arrow sectional drawing of FIG. 1, (b) is BB arrow sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hybrid exhaust turbine supercharger 2 Exhaust gas 3 Turbine part 4 Outside air 5 Compressor part 6 Casing 16 Silencer 18 Shell housing 18a Recess 19 Generator 23 Oil reservoir 25 Lubricating oil discharge pipe

Claims (2)

A turbine section driven by exhaust gas guided from the internal combustion engine, a compressor section driven by the turbine section to pump outside air to the internal combustion engine, and a casing supporting the turbine section and the compressor section,
A silencer connected to the intake system of the internal combustion engine and supported by the casing via the compressor is provided on the upstream side of the compressor. The silencer is provided at the center of the silencer. A hybrid exhaust turbine supercharger in which a shell housing having a recess is provided, and a generator is accommodated in the recess,
An oil sump is formed at the bottom of the shell housing to lubricate a bearing disposed in the generator and to store the lubricating oil dripped from the generator. A hybrid exhaust turbine supercharger which is returned by gravity to an oil tank disposed downstream via a lubricating oil discharge pipe communicating with a reservoir.   An internal combustion engine comprising the hybrid exhaust turbine supercharger according to claim 1.

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