JPH0143476Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an internal combustion engine that also serves as a compressor.

Some recent internal combustion engines are equipped with a compressor driven by the engine, and the compressed air from the compressor is used for appropriate purposes.

However, independently arranging a compressor driven by an internal combustion engine in this way is extremely disadvantageous in terms of space and cost.

Therefore, the present invention was devised to solve the above-mentioned conventional problems, and its purpose is to provide an internal combustion engine that can also be used as a compressor, in which one of the plurality of cylinders can also be used as a compressor. This is what I did.

That is, the compressor-cum-combustion engine of the present invention has the following characteristics:
A fuel cutoff valve is provided in the fuel supply system of one part of the cylinder, and an exhaust on-off valve is provided in the exhaust path of the one part of the cylinder, and a check valve is provided on the engine side from the location where the exhaust on-off valve is installed. The air tank is connected to the air tank by a branch path having a branch path, and the fuel cutoff valve and the exhaust opening/closing valve are operated by a control circuit that operates by detecting the set pressure of the air tank.

An embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a schematic system diagram of the compressor-cum-diesel engine of this embodiment, and Fig. 2 is an enlarged longitudinal section of the check valve shown in Fig. 1. It is a front view.

First, 1 in Figure 1 means No. 1, No. 2, No.
3. It is a 4-cylinder in-line diesel engine consisting of No. 4 cylinders, and each cylinder has two fuel injection nozzles.
is arranged to inject fuel from the fuel injection pump 3 into the cylinder. Fuel is supplied to each plunger 3a of the fuel injection pump 3 independently.

4 is a fuel tank, which is connected to the injection pump 3 through a fuel pipe 5.

5a is a fuel pipe that supplies fuel to cylinder No. 4, and a fuel cutoff valve 6 is disposed in the middle of the pipe.

7 is a fuel return pipe from the injection pump 3 to the fuel tank 4.

Reference numeral 8 denotes an exhaust passage, and an exhaust opening/closing valve 9 is disposed in the middle of the exhaust passage 8a of cylinder No. 4, and from the disposed position to the main body side of the diesel engine 1, a bar member 17 is installed as shown in FIG. A branch passage 11 including a check valve 10 including a valve body 18 and a valve body 18 is provided, and the branch passage 11 is connected to an air tank 12 .

The fuel cutoff valve 6 and exhaust on/off valve 9 are connected to a power source 14 by a control circuit 13.
is a normally open type switch disposed in the control circuit 13, which opens and closes depending on the pressure detected by the pressure sensor 16 of the air tank 12.It closes when the pressure is below the set pressure value and opens when it exceeds it. It's getting old.

Since the compressor-cum-combustion engine according to the present invention is constructed as described above, the air tank 12
When the pressure of the compressed air within is less than the set value, the switch 15 is closed and the control circuit 13 is energized.

Therefore, the fuel cutoff valve 6 is closed and cylinder No. 4 is closed.
The fuel is cut off, and the exhaust opening/closing valve 9 is also closed.

Therefore, cylinder No. 4 operates as a compressor, and compressed air is forced into the air tank 12 while pushing open the valve body 18 of the check valve 10 against the spring force of the spring material 17.

Next, when the air tank 12 is filled with compressed air and the air pressure reaches the set value, the check valve 10 closes its valve body 18 and at the same time the switch 15 opens and the control circuit 13 is de-energized. Since the engine is stopped, the fuel cutoff valve 6 is opened and the exhaust valve 9 is also opened.

Therefore, cylinder No. 4 again operates as an internal combustion engine.

In this way, in the compressor-cum-compressor internal combustion engine according to the present invention, one cylinder of the engine can be temporarily operated as a compressor.
In particular, there is no need to provide an independent compressor.

Therefore, it is possible to provide an internal combustion engine that is more advantageous in terms of space and cost than an internal combustion engine equipped with a conventional compressor.

Note that if the distance from the engine exhaust valve to the exhaust opening/closing valve 9 and check valve 10 is long and the volume between them is large, there will be a large amount of residual high-pressure air, and this high-pressure air will open the exhaust valve during the intake stroke. Therefore, it is desirable to reduce the volume as much as possible, and for this purpose, an exhaust on-off valve 9 is installed in the exhaust port.
A check valve 10 is preferably provided.

Further, the number of cylinders operated as a compressor is not limited to one.

[Brief explanation of the drawing]

FIG. 1 is a schematic system diagram of a compressor-cum-combustion engine according to an embodiment of the present invention, and FIG. 2 is an enlarged longitudinal sectional view of the check valve shown in FIG. 1. 1... Diesel engine, 3... Fuel injection pump, 6... Fuel cutoff valve, 8, 8a... Exhaust path, 9
...exhaust on/off valve, 10...check valve, 11...branch path, 12...air tank, 13...control circuit, 1
4...Power supply, 15...Switch, 16...Pressure sensor.

Claims (1)

[Scope of utility model registration request] A fuel cutoff valve is disposed in the fuel supply system of one cylinder of an internal combustion engine having a plurality of cylinders, and an exhaust on-off valve is provided in the exhaust passage of the one cylinder, and the location of the exhaust on-off valve is provided. The air tank is connected by a branch path having a check valve on the engine side, and the fuel cutoff valve and exhaust opening/closing valve are operated by a control circuit that operates by detecting the set pressure of the air tank. A characteristic internal combustion engine that also functions as a compressor.