JPH0143475Y2 - - 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 disposing a compressor driven by an internal combustion engine in this way is extremely disadvantageous in terms of space and cost.

Therefore, as a countermeasure to the above, an internal combustion engine that can also be used as a compressor has been devised, in which some of the cylinders can also be used as a compressor. In this case, if the exhaust pipes of those cylinders are continuous, there is a problem that the compressed high-pressure air acts on the exhaust valve of the cylinder during the intake stroke, causing the exhaust valve to open. As a countermeasure, it is necessary to install a valve spring with a strong set force, and if this is done, excessive surface pressure will be generated on the cam and tappet, which will cause problems in the durability of the valve drive device. Become.

Therefore, the present invention aims to prevent compressed air from flowing backward when multiple cylinders are used as a compressor in the compressor-cum-compressor internal combustion engine. It is an object of the present invention to provide an internal combustion engine that can also serve as a compressor and is capable of delivering a large amount of compressed air while preventing air leakage and deterioration of durability.

The compressor-cum-compressor internal combustion engine according to the present invention for achieving the above object includes (a) two or more cut cylinders provided with fuel cutoff valves and a plurality of non-cut cylinders; (b) the cut cylinders A check valve that opens by forward flow (positive pressure) of exhaust gas and closes by reverse flow (reverse pressure) is provided in each exhaust path of the cylinder, and then the valves are joined together, and (c) an exhaust opening/closing valve is installed after the joining point. (d) branching between the downstream of the check valve and the upstream of the exhaust opening/closing valve to connect an air tank with a branching passage equipped with a compressed air opening/closing valve; (e) Each of the valves is configured to be operated by a control circuit that operates based on the set pressure of the air tank.

In the present invention, a "cut cylinder" refers to a cylinder that operates as a compressor by cutting off the fuel supply, and a "non-cut cylinder" refers to a cylinder that operates as an internal combustion engine without cutting off the fuel supply. It means.

In addition, the check valve provided in the exhaust path of the cut cylinder has the function of opening by forward flow or positive pressure of the compressed air exhausted from these cut cylinders, and closing by reverse flow or reverse pressure. It is something.

Since the present invention is constructed as described above, when fuel is cut from a plurality of cylinders and these cylinders are operated as a compressor, each cut cylinder is controlled by a check valve installed in the cylinder into which the individual fuel was cut. Compressed air can be produced more efficiently than a plurality of cylinders while preventing the exhaust valve from opening due to the influence of compressed air discharged from other cylinders during the intake stroke to the cylinder.

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 shows the non-operation of the check valve shown in Fig. 1. FIG. 3 is an enlarged side sectional view of the main part of the check valve of FIG. 1 when the check valve is in operation.

First, in Figure 1, 1 is 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 the plunger of the fuel injection pump 3 independently.

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

Reference numerals 5a and 5b are fuel pipes that supply fuel to plungers 3a and 3b of the fuel injection pump 3 that inject fuel into cylinders No. 3 and No. 4, and a fuel cutoff valve 6 is disposed in the middle thereof, respectively. These No.3
The No. 4 cylinder is a "cut cylinder" that shuts off fuel and operates as a compressor, and the remaining No. 1 and No. 2 cylinders are "non-cut cylinders" that operate as an internal combustion engine without shutting off fuel. They each constitute a "cut cylinder". In addition, the surplus fuel from the injection pump 3 is transferred to the fuel return pipe 7.
The fuel is returned to the fuel tank 4 by the following steps.

Reference numeral 8 denotes an exhaust path, which includes an exhaust path connected to a non-cut cylinder and an exhaust path 8 connected to a cut cylinder.
A and 8b are in a separate system, and each of these exhaust passages 8a and 8b is provided with a check valve 20, which merges on the downstream side, and an exhaust opening/closing valve 9 provided after this exchange point. It joins the exhaust passage 8 of the cut cylinders No. 3 and No. 4 through the pipe. A branch passage 11 is formed downstream of the exhaust passages 8a and 8b and upstream of the exhaust opening/closing valve 9, and an air tank 12 is provided in this branch passage 11 via a compressed air opening/closing valve 10.

In addition, an open/close type check valve 20 is provided for each cylinder No. 3,
It is desirable to provide each exhaust port near the outlet of each exhaust port (not shown) of No. 4.

The check valve 20, as shown in FIG.
and 8b mounted at right angles to the flow direction;
The main body 21 includes a valve chamber 22 and a cylinder chamber 23, and a valve body 24 is housed in the valve chamber 22 so as to be able to be inserted into and taken out from the exhaust passages 8a and 8b.

A piston 25 is actuated when compressed air flows into the cylinder chamber 23, and causes the valve body 24 connected by its shaft portion 25a to protrude into the exhaust passages 8a, 8b against the return spring 26.

The air chamber 23a of the cylinder chamber 23 is connected via an air passage 27 to an appropriate compressed air source, such as an air tank 1.
Compressed air is introduced into the air chamber 23a when an electromagnetic valve part 28 of a check valve connected to a compressed air source 2 or a separate compressed air source and opens and closes the air passage 27 is operated, that is, when energized.

The electromagnetic valve section 28 has three types, and 28a is its air discharge path.

Further, the valve body 24 is a hollow body, and a plurality of openings 24c, 24c are formed in both side surfaces 24a, 24b, and a check plate 29 is inserted into the side surface 24a (cylinder side surface) by the biasing force of a spring 30. ) is pressed against the inner surface of the

Therefore, when activated, the valve body 24 overcomes the force of the spring 30 from the diesel engine 1 side and allows air to pass through, as shown in FIG.
The airflow (or exhaust gas) is prevented from flowing backward from the sides a and 8b to the diesel engine 1 side.

The electromagnetic valve portions 28 of the fuel cutoff valve 6 , exhaust on-off valve 9 , compressed air on-off valve 10 , and check valve 20 are connected to a power source 14 by a control circuit 13 .

Reference numeral 15 denotes 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 a set pressure value and opens when it exceeds it. It's becoming like that.

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

Therefore, all the fuel cutoff valves 6 are closed to cut off fuel to cylinders No. 3 and No. 4 (cut cylinders), and the exhaust on/off valve 9 is also closed and the compressed air on/off valve 10 is opened at the same time.

Therefore, cylinders No. 3 and No. 4 operate as compressors and forcefully feed compressed air to the air tank 12 via the compressed air on-off valve 10.

At this time, compressed air is introduced by energizing the solenoid valve section 28, which causes the piston 25 to resist the return spring 26 and cause the valve body 24 of each check valve 20 to protrude into the exhaust passages 8a, 8b. , cylinder no.
3. Airflow from No. 4 will not be blocked.

Furthermore, while each check valve 20 is in operation, the cylinder No.
3. No. 4 is connected to the exhaust path 8 during the overlap between the end of the exhaust stroke and the beginning of the intake stroke, and during the intake stroke.
Even if the pressure drops from the a and 8b sides, the valve body 2
Since the check plate 29 in No. 4 contacts the inner surface of the side surface 24a and closes the opening 24c, backflow of compressed air is prevented. In particular, the operating function of the exhaust valve is not impaired.

Therefore, the function of cylinders No. 3 and No. 4 as a compressor is not impaired.

Next, the air tank 12 is filled with compressed air, and when the air pressure reaches the set value, the switch 15 is opened and the control circuit 13 is de-energized, so each fuel cutoff valve 6 is opened and the exhaust gas is discharged. Open/close valve 9
opens, and the on-off valve 10 closes.

Therefore, cylinders No. 3 and No. 4 operate as a combustion engine again.

In this embodiment, the two cylinders No. 3 and No. 4 of the four-cylinder internal combustion engine are also used as compressors, but two or more cylinders among the multiple cylinders may also be used as compressors.

Furthermore, the check valve of the present invention is not limited to the one of the above embodiments, but may be of any suitable structure as long as it performs a check action in conjunction with the switch 15.

As mentioned above, the compressor-cum-combustion engine according to the present invention is composed of two or more cut cylinders provided with fuel cutoff valves and a plurality of non-cut cylinders, and has an exhaust route in each exhaust path of the cut cylinders. After providing a check valve that opens by positive pressure (or positive pressure) and closes by reverse flow (or reverse pressure), the valve is connected to the exhaust path of the non-cut cylinder through an exhaust opening/closing valve after the merging point. a control circuit that connects an air tank with a branch path equipped with a compressed air on/off valve by branching between the downstream of the check valve and the upstream of the exhaust on/off valve, and operates each of the valves at the set pressure of the air tank; It is configured to be operated by the following effects.

(1) Since the fuel in two or more cylinders is cut to form a cut cylinder and this is operated as a compressor, it is possible to supply a large amount of compressed air, and there is no need to provide an independent compressor. do not have.

Therefore, compared to a compressor that is a combination of a conventional internal combustion engine and a compressor driven by the engine, it has great advantages in terms of space and cost.

(2) In this invention, check valves are provided in the exhaust passages of each cut cylinder and then merged, so that the pressure of compressed air discharged from other cylinders during the intake stroke does not act on the exhaust valve. As a result, even if a normal valve spring is used, the exhaust valve operates without any problem, and a plurality of cut cylinders can be efficiently operated as a compressor.

(3) A check valve provided in each of the exhaust passages of a plurality of cutting cylinders, an exhaust opening/closing valve provided at the confluence of the exhaust passage of the cutting cylinder and an exhaust passage of a non-cutting cylinder, and an exhaust opening/closing valve provided in the exhaust passage of the cutting cylinder. By using a compressed air on-off valve provided in a branch path branching after the merging point, it is possible to form a path that is independent of the exhaust path of the non-cut cylinder and is filled only with compressed air.

Since the air tank is disposed in this path, compressed air can be efficiently generated while making the plurality of cut cylinders independent from the exhaust passages of the non-cut cylinders.

In addition, in the present invention, a plurality of cut cylinders and a plurality of non-cut cylinders are combined to form a compressor-cum-compressor internal combustion engine, and compressed air can normally be produced by operating a plurality of cut cylinders. By applying the present invention to a large compressed air operating device, it is possible to provide a practical internal combustion engine that also functions as a compressor.

In addition, if a small amount of compressed air is required, it is possible to produce compressed air by operating one cut cylinder, and the amount of compressed air produced can be adjusted according to the amount of compressed air used. Therefore, the internal combustion engine can be operated efficiently.

[Brief explanation of the drawing]

Fig. 1 is a schematic system diagram of a compressor-cum-diesel engine according to an embodiment of the present invention, Fig. 2 is an enlarged side sectional view of the main parts of the check valve in Fig. 1 when it is not in operation, and Fig. 3 2 is an enlarged side sectional view of the main part of the check valve of FIG. 1 when it is in operation; FIG. 1... Diesel engine, 3... Fuel injection pump, 6... Fuel cutoff valve, 8, 8a, 8b... Exhaust path, 9... Exhaust on/off valve, 10... Compressed air on/off valve, 11... Branch path , 12...Air tank, 13
... Control circuit, 14 ... Power supply, 15 ... Switch, 16 ... Pressure sensor, 20 ... Check valve, 24
... Valve body, 25 ... Piston, 28 ... Solenoid valve part of the check valve.

Claims (1)

[Scope of utility model registration request] A check valve that is composed of two or more cut cylinders provided with fuel cutoff valves and a plurality of non-cut cylinders, and that opens in each exhaust passage of the cut cylinders by forward flow of exhaust gas and closes by reverse flow of exhaust gas. is provided so as to merge on the downstream side of the check valve, and after the junction, the exhaust path of the non-cut cylinder is merged with the exhaust passage of the non-cut cylinder via an exhaust opening/closing valve, and the exhaust path is connected to the downstream side of the check valve and upstream of the exhaust opening/closing valve. An internal combustion engine that also serves as a compressor, wherein an air tank is connected to the air tank by a branch path equipped with a compressed air on/off valve, and each of the valves is operated by a control circuit that operates at the set pressure of the air tank.