JPS62279232A - Internal combustion engine associated with supercharger - Google Patents

Abstract

PURPOSE:To achieve a good engine performance from a low load area to a heavy load area by coupling the exhaust gas inlet side of a third supercharger through a flow control valve to an exhaust pipe branched from exhaust pipes of respective engines and coupling the supply side of said supercharger to an air supply pipe of engine. CONSTITUTION:Under low load operation of engines 2, 2, flow regulation valves 7, 7 are fully closed to lead the exhaust gas from respective cylinders 3, 3 entirely to the superchargers 1, 1. The air compressed by the superchargers 1, 1 passes through respective air supply pipes 5, 5 and filled in respective cylinders 3, 3. Under heavy load operation of the engines 2, 2, flow regulation valves 7, 7 arranged on the exhaust pipes 6, 6 branched from the exhaust pipes 4, 4 of respective cylinders 2, 2 are opened to lead the excessive exhaust gas to a third supercharger 8. The supply air produced in such a manner is led through supply air extraction pipes 9, 9 to the air supply pipes 5, 5 of respective engines 2, 2 thus executing the supercharging.

Description

[Detailed description of the invention] 3. Detailed description of the invention (Industrial application field) The present invention relates to a supercharged internal combustion engine.

[Conventional technology]

It is well known that if fresh air with increased density is separately supplied by a compressor, the output can be improved without increasing the cylinder volume or rotation speed, and a supercharger is used to compress and supply this fresh air. It will be done.

The above air supply methods using a supercharger include a dynamic pressure supercharging method in which the exhaust energy is directly guided to the supercharger turbine without converting it into heat, and a dynamic pressure supercharging method in which the exhaust gas discharged from the cylinder is kept constant. The pressure is supplied to the turbocharger turbine,
There is a static pressure supercharging method in which the turbine drives a compressor and supplies compressed air to the cylinder.

Comparing the performance of each of the above supercharging methods, as shown in Figure 2, the performance of the dynamic pressure supercharging method deteriorates under high loads, while the performance of the static pressure supercharging method deteriorates under partial loads. .

On the other hand, in the case of a marine engine equipped with a two-engine, single-shaft ■ type engine, or a two-engine, two-shaft, rectangular type engine, the following problems occur regardless of which of the above-mentioned supercharging systems is adopted.

[Problem that the invention seeks to solve]

In other words, in the case of the ■ type engine or L type engine as described above, when one engine is operated, the supercharger does not rotate sufficiently, the air supply to the engine is insufficient, and the temperature of the combustion chamber components, especially the exhaust valve, increases. The drawback was that it was too expensive.

[Means for solving problems]

In order to solve the problems of the above-mentioned prior art, this invention
．． In a V-type engine equipped with a second supercharger or with two rhinoceros engines each equipped with one supercharger,
The exhaust inlet side of the third supercharger was connected to the branch exhaust pipe branching from the exhaust pipe of each engine via a flow rate adjustment valve, and the air supply side of this supercharger was connected to the air supply pipe of each engine. It is characterized by this.

(Function) Based on the above configuration, at low load, in that state,
Air is supplied using two existing superchargers that can obtain 100% of the supercharging capacity loss of each supercharger, and when the load is high, the flow control valve is opened to supply excess air to the third supercharger. Introducing exhaust air and supplying air by the third supercharger! By introducing it into the air supply pipe No. 11, good engine performance can be obtained from low load to high load. [Embodiment] The present invention will be described below with reference to an embodiment shown in FIG.

The embodiment shown in FIG. 1 shows a case where two rectangular engines 2, 2 each equipped with one supercharger 1.1 are provided, and each engine 2, 2 has a cylinder 3°3. and a supercharger 1.1 capable of obtaining the required amount of supercharging in a low load state are connected on the exhaust side by an exhaust pipe 4.4 and on the air supply side by air supply pipes 5,5.

Each branch exhaust pipe 6.6 branching from the exhaust pipe 4.4 of EI2.2 is provided with flow ω adjustment valves 7, 7, respectively, and the branch exhaust pipe 6.6 between these flow adjustment valves 7, 7 is interposed. The exhaust inlet side of a third supercharger R8, which can obtain the necessary amount of supercharging in a high load state with the superchargers 1 and 1, is connected to the confluence point of .6.

The air supply side of this third supercharger 8 is communicated with the air supply pipes 5, 5 of each engine 2, 2 by air supply bleed pipes 9, 9, and the connection to the third supercharger 8 is A check valve 10 is interposed to prevent backflow to the supercharger 8 side.

Next, the effect will be explained.

When the engine 2.2 is operating at low load, the flow rate adjustment valve 7゜7 is fully closed, and all the exhaust from each cylinder 3 is transferred to the supercharging R1.
, 1. The air compressed in these superchargers 1, 1 passes through an air supply pipe 5.5 to each cylinder 3.3.
is filled into. At this time, the air supply from the supercharging amounts 1, 1 is blocked by the check valve 10, so the operation is similar to that of a normal internal combustion engine with a supercharger.

On the other hand, when the engines 2, 2 are under high load, the flow rate regulating valves 7, 7 on the branch exhaust pipes 6, 6 branching from the exhaust pipes 4, 4 of each machine 11Q2゜2 are opened, and excess exhaust gas is diverted to the third exhaust pipe. The air thus produced is introduced into the air supply pipes 5.5 of each engine 2, 2 through an air supply bleed pipe 9.9 for supercharging.

〔Effect of the invention〕

As explained above, the present invention has the following advantages: In a type engine equipped with a second supercharger or two type engines each equipped with one turbocharger, the flow rate is adjusted to the branch exhaust pipe that branches from the exhaust pipe of each engine. By connecting the exhaust inlet side of the third turbocharger via a valve and connecting the intake side of this turbocharger to the floating air supply pipe, the fuel consumption rate under high loads does not deteriorate. The fuel consumption rate during frequently used partial loads can be improved, and the fuel economy of the plant can be significantly increased. Furthermore, since sufficient air can be supplied to the engine even under partial load, overheating of the combustion chamber components, particularly the exhaust valve, is prevented, and durability and reliability can be greatly improved. Furthermore, there are various effects such as being able to supply sufficient air to the engine even when operating one machine on a ship with two machines on one wheel or two machines on two shafts.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a performance comparison chart between a dynamic pressure supercharger and a static pressure supercharger. 1...Supercharger, 2...Engine, 3...Cylinder, 4
...Air supply pipe, 5...Exhaust pipe, 6...Branch exhaust pipe,
7...Flow rate adjustment valve, 8...Third supercharger, 9...
Supply air bleed pipe, 10... check valve. Figure 1 Figure 2 Purchase A

Claims (1)

[Claims] V-type engine equipped with first and second superchargers, or one each
In an engine equipped with two L-type engines each equipped with one supercharger, the exhaust inlet side of the third supercharger is connected to a branch exhaust pipe branching from the exhaust pipe of each engine via a flow rate adjustment valve, An internal combustion engine with a supercharger, characterized in that the air supply side of the supercharger is connected to an air supply pipe of the engine.