JPH07197819A - Reciprocating internal combustion engine - Google Patents

Abstract

PURPOSE:To realize the stable high efficiency of the internal combustion engine by detecting the pressure drop in a compressed air reservoir to be caused by the use of the compressed air, introducing the signal to an opening/closing adjustment mechanism of an air intake valve, and quickening the timing of closing in the compression stroke of the air intake valve by the opening/closing adjustment mechanism. CONSTITUTION:The compressed air is stored in a compressed air reservoir 1 by using the night power to drive a compressor. When a generator is driven by operating a reciprocating internal combustion engine 9 in the daytime, the air is fed by operating a control valve 5 mounted on a piping 6. The pressure in the compressed air reservoir 1 is detected by a pressure detector 2, and the signal V is transmitted to a control device 27 to control an opening/closing adjustment mechanism 19. When the compressed air in the compressed air reservoir 1 is comsumed by the internal combustion engine 9 and the pressure is gradually reduced, the pressure drop is detected by the pressure detector 2, the signal is introduced to the control device 27, a cam mechanism 18 of the opening/closing adjustment mechanism 19 is moved to a small diameter part to quicken the closing timing of an air intake valve 10a to make the air volume to be fed to the cylinder 12 constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating internal combustion engine, and more particularly to a reciprocating internal combustion engine suitable as a heat engine for a relatively small power generation facility having an output of 1000 KW or less such as a cogeneration power generation facility. .

[0002]

2. Description of the Related Art Generally, in a power generation facility, when the power generation facility is a large facility, the gas turbine engine is compact and can output a large output, which is suitable. However, in a small power generation facility of 1000 KW or less, the reciprocating internal combustion engine is highly efficient. Suitable for However, in such a gas turbine engine or reciprocating internal combustion engine, the effective output is limited because the compressed air required is obtained by driving the compressor and the supercharger with its own energy.

Due to such a technical problem, the compressed air obtained by driving the compressor by using the surplus power at night is stored in the compressed air storage tank, and the compressed air in the compressed air storage tank is reciprocated by the gas turbine engine or the reciprocating air. It is believed to have supplied a dynamic internal combustion engine, which has already been implemented in the field of gas turbine engines.

[0004]

A problem arises when the compressed air stored in the compressed air storage tank is supplied to the reciprocating internal combustion engine. That is, the stored compressed air gradually decreases in pressure as it is used, so that the intake air pressure of the engine changes. This affects the charging efficiency of the air supplied to the cylinder, the discharge pressure changes, and the engine cannot be operated safely.

For these reasons, the reciprocating engine using the stored compressed air cannot be put to practical use. However, there has recently been a great demand for this type of small-scale power generation equipment, and improvement in efficiency has been desired in this field.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of a reciprocating internal combustion engine used in a conventional small-sized power generation facility or the like, and a compressed air storage tank having a pressure detector. And an intake pipe of the reciprocating internal combustion engine are connected by a pipe having a fuel mixer, and an opening / closing adjusting mechanism of an intake valve arranged in the intake pipe is provided, and a signal of the pressure detector is introduced into the opening / closing adjusting mechanism. The present invention provides a reciprocating internal combustion engine that controls so that the closing timing of the intake valve in the compression process is advanced in response to the pressure drop in the compressed air storage tank.

[0007]

[Operation] In the reciprocating internal combustion engine of the present invention, the pressure drop in the compressed air storage tank caused by the use of compressed air is detected by the pressure detector, and the signal is introduced into the opening / closing adjustment mechanism of the intake valve to adjust the opening / closing. Since the mechanism closes the timing of closing the intake valve in the compression process, the amount of air (weight flow rate) entering the internal combustion engine is automatically controlled to be constant, and as a result, the internal combustion engine is operated effectively. be able to.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an internal combustion engine having a reciprocating degree according to the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 is a compressed air storage tank having a pressure detector 2,
An air compressor 3 is connected as a compressed air supply source of the compressed air storage tank 1 through a pipe 4, and a reciprocating internal combustion is performed by a pipe 8 having a fuel mixer 7 connected to a valve 5 and a fuel supply pipe 6 as an air supply side. Connected to the intake pipe 10 of the engine 9,
The air-fuel mixture is supplied to the reciprocating internal combustion engine 9 according to the output.

The reciprocating internal combustion engine 9 has the intake pipe 10 and the exhaust pipe 14 at the cylinder head portion of a cylinder 12 having a piston 11 built therein, and the intake valve 10a and the exhaust valve 14 are provided therein.
a are provided respectively, and these are valve drive mechanisms 15, 1
It is driven by 5a. These valve drive mechanisms have a well-known structure and are composed of a rocker arm 16, a push rod 17, a cam mechanism 18 for driving the push rod 17, and the like.

In the internal combustion engine of the present invention, the cam mechanism 18 is incorporated in an open / close adjusting mechanism 19 for adjusting the open / close ratio of the intake valve 10a. As shown in FIG. 2, the opening / closing adjusting mechanism 19 is provided with a drive gear 22 and a special cam 23 on a cam shaft 21 supported by a bearing 20 so as to be rotatable and reciprocally movable a predetermined distance. To camphor follower 1
A push rod 17 having a lower end 7a is in contact therewith. A connecting rod 25 is connected to the end of the camshaft 21 via a connecting portion 24, and a connecting device 27 is connected to the connecting rod 25. Signal V is supplied via the signal line 28.

In this embodiment, the cam 23 has a cam surface formed into a curved surface having a different shape in each cross section in the longitudinal direction as shown in FIG. 3, and the lift amount of the push rod 17 varies depending on the position where the cam follower 17a abuts. Is changing. On the other hand, the cam shaft 21 is controlled by the control device 27.
The camshaft 21 is moved to change the lift amount of the intake valve 10a to change the "timing of closing the intake valve 10a". Therefore, it is possible to automatically delay the internal combustion engine as compared with a normal internal combustion engine.

Next, the operation of the reciprocating internal combustion engine according to the present invention will be described. First, compressor 3 using night power
To suck and compress the air A from the suction pipe 3a and store it in the compressed air storage tank 1 through the pipe 4 as compressed air of, for example, about 10 kg / cm ² . When the reciprocating internal combustion engine 9 is operated during the day to drive a generator (not shown), the control valve 5 provided in the pipe 6 is operated to supply air. The pressure in the compressed air storage tank 1 is detected by the pressure detector 2, and the signal V related to the pressure is transmitted to the control device 27 and controls it.

As described above, the cam shaft 21 is moved in the compressed air storage tank 1 by the pressure of the compressed air through the control device 27 through the arrow a.
-Move like a '. When the pressure drops, the control device 27 pushes the connecting rod 25 in the direction of the arrow a ′ to adjust the closing timing of the intake valve 10a so as to keep the flow rate of the air supplied into the cylinder 12 of the internal combustion engine 9 constant. To do.

When the pressure in the compressed air storage tank 1 drops, the intake valve 10a closes slightly earlier in the compression stroke, and conversely, when the compressed air pressure is high, the intake valve 10a closes slightly late. It is automatically controlled. on the other hand,
A fuel mixer 7 is provided in the middle of the pipe 8, and the amount of air flowing through the pipe 8 from the fuel supply pipe 6, that is, the internal combustion engine 9
The fuel F is supplied according to the output of
The internal combustion engine 9 is rotated at a predetermined rotation speed to rotate a generator (not shown) to generate predetermined power.

In this way, the compressed air in the compressed air storage tank 1 is consumed by the internal combustion engine 9 and its pressure gradually decreases. This pressure drop is detected by the pressure detector 2 and the signal V thereof is introduced into the control device 27 to sequentially move the cam shaft 21 in the direction of the arrow a ′ so that the contact position of the push rod 17 to the cam 23 is gradually reduced in diameter. Therefore, the closing timing of the intake valve 10a is advanced.

As a result, the amount of air (weight flow rate) supplied to the cylinder 12 becomes constant. This means that even though the pressure in the compressed air storage tank 1 gradually decreases, the output generated by the internal combustion engine 9 can be made constant because the amount of air supplied to the cylinder 12 becomes constant. is there. The present invention stores nighttime electric power as compressed air, which can be used in a reciprocating internal combustion engine during the daytime. When a compressed air storage type internal combustion engine is normally used as an internal combustion engine with an output of 100 kW and compressed air is stored with an air compressor of 30 kW at night, the conversion utilization rate of night power is 80%.
If so, the electric power of 24 kW (30 kW x 0.8 = 24 kW) has been transferred to the internal combustion engine, which is 100 K
The same fuel consumption as when operated at W is 124 kW
The output of can be generated.

According to the present invention, since it is possible to temporarily convert nighttime electric power into compressed air and move it during the daytime, it is possible to equalize the use of electric power, and at the same time, to supply inexpensive nighttime electric power during the daytime. It can be used for. Although the case where the cam mechanism is used for the opening / closing adjusting mechanism 19 of the intake valve 10a has been described in the above embodiment, the present invention is not limited to this, and other means such as a hydraulic mechanism may be used.

[0018]

As is clear from the above description, according to the reciprocating internal combustion engine of the present invention, the stored compressed air can be utilized, and not only the efficiency of the internal combustion engine can be improved. , The amount of air in the cylinder can be made constant by advancing the closing of the intake valve due to the pressure drop of the stored compressed air, and as a result, the pressure in the internal combustion engine can be kept within a predetermined range. Is possible,
Stable operation of the engine becomes possible.

Further, since the reciprocating internal combustion engine configured as described above is used, the compressed air obtained by the night power can be used in the daytime to generate electricity.
It is also possible to use the night power efficiently.

[Brief description of drawings]

FIG. 1 is a system diagram showing an embodiment of a reciprocating internal combustion engine according to the present invention.

FIG. 2 is a side view of an intake valve opening / closing adjusting mechanism in an embodiment of a reciprocating internal combustion engine using bright intake air.

FIG. 3 is a perspective view showing the shape of a cam.

[Explanation of symbols]

1 Compressed Air Storage Tank 2 Pressure Detector 3 Air Compressor 6 Fuel Supply Pipe 7 Fuel Mixer 9 Reciprocating Internal Combustion Engine 10 Suction Pipe 10a Suction Valve 12 Cylinder 18 Cam Mechanism 19 Opening / Closing Mechanism 20 Bearing 21 Cam Shaft 22 Drive Gear 23 Cam Two
4 connecting part 25 connecting rod 27 control device 28 signal line

Claims (1)

[Claims] 1. A compressed air storage tank having a pressure detector and an intake pipe of a reciprocating internal combustion engine are connected by a pipe having a fuel mixer, and an opening / closing adjusting mechanism for an intake valve arranged in the intake pipe is provided. A reciprocating internal combustion engine characterized in that a signal from a pressure detector is introduced into the opening / closing adjusting mechanism, and control is performed so as to accelerate the closing timing of the intake valve in the compression process in response to the pressure drop in the compressed air storage tank. organ.