KR101600011B1 - engine generator system having apparatus for torque stabilization - Google Patents

Abstract

An input side transmission capable of changing the number of revolutions of the rotary input shaft, a rotation which is changed by the transmission, a rotation input shaft which is connected to the power shaft when there is a power shaft transmitting the rotation force from the outside, An output side transmission that receives the rotational force from the flywheel and changes the number of revolutions; a torque that is provided with a rotational output shaft that receives a rotational force having a changed rotational speed in the output side transmission and that transmits the rotational force to the demand side such as the generator A stabilizing device and an engine generator having the device are disclosed.
According to the present invention, the torque can be stably maintained when transmitting the rotational force from the rotational force supplying device to the rotational force applying place, thereby preventing vibration, noise and transmission loss of the rotational force due to unstable rotation, So that the operation of the engine can be stabilized in the engine generator and the momentary overload can be suppressed, thereby improving the operating efficiency of the engine, the fuel efficiency and the engine life.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an engine generator system having a torque stabilizer,

The present invention relates to a torque stabilizer, and more particularly, to a torque stabilizer capable of transmitting a rotational power to a required position in a uniform rotational state, in addition to a torque generating device that obtains rotational power, And an engine power generation system including such a torque stabilization device.

There is a flywheel installed in a vehicle internal combustion engine as a stabilizing device used to stably maintain the rotation of the engine. Usually, the flywheel is about half of the inertia mass of the entire engine. The inertia mass of the flywheel is preferably large in consideration of stability at idling, stability of rotation at the time of low rotation, or gradual change, but it is generally preferable to consider the responsiveness of the engine and the fuel consumption.

If the inertial mass is small even though the torque is the same in the steady state, the torque used to increase the rotational speed of the engine itself decreases in proportion thereto, so that the torque used to actually accelerate the vehicle becomes large. This torque, for example, does not contribute to vehicle acceleration, since about 30% of the torque that occurs during vehicle acceleration on the road is used to increase engine speed.

Therefore, if the inertia mass of the flywheel is small, the useless torque for raising the engine speed is not used, and therefore the fuel consumption at the time of acceleration is improved. However, even in the case of a vehicle, the flywheel can not be designed considering only the relationship between the inertial mass and the fuel economy due to various reasons.

On the other hand, there is a case where an internal combustion engine is installed in an area where electricity supply through an external power line is not smooth, and the engine is operated to operate a generator, thereby producing electricity. 1 is a conceptual explanatory view for explaining the concept of such an engine generator. A flange 12 is provided at an end of the power shaft 11 of the engine 10 and a rotating shaft 21 of the generator 20 or a flange 22 provided at an end portion of the motor shaft is rotated together have.

The electric power obtained through such small power generation is less stable due to the rotation of the engine, etc., compared to electricity supplied through a large power plant, a substation and other electric networks, although it may vary depending on the type, installation type and output of the engine The quality of electric frequency and voltage is liable to be lowered. In this case, it is necessary to increase the stability of the engine rotation in which the generator 20 is rotated in order to maintain the electric quality. Therefore, a flywheel (not shown) is typically used for the engine generator.

Torque stabilization devices, such as flywheel, are also needed for renewable energy generation, for example, power generation devices such as wave power generation and small wind power generation, which have strong pulsating power and weak stability.

However, in the case of the engine generator, the flywheel is installed to rotate together with the power shaft 11 of the engine 10 and rotates at the same rotational speed as the engine speed. In particular, when the engine 10 rotates at low speed, It is difficult to ensure sufficient stability of the torque. If the stability of rotation is low, the mechanical vibration and noise increase with rotation, and these phenomena eventually lead to the conversion of mechanical energy to thermal energy, which raises the temperature of the mechanical element element and leads to deterioration.

In addition, when electricity demand changes, the output is controlled by checking the check points of the generator rotation speed and the like through a sensor attached to the system and controlling the fuel supplied to the engine connected to the generator. When the size of the engine is small and changes in electricity demand or electricity demand are severe, the fuel supplied to the engine is rapidly increased and the engine is rapidly accelerated to cope with the change in demand. There is a problem in that deterioration is caused to reduce the mechanical life, increase the risk of occurrence of failure and unexpected downtime of the engine, incomplete combustion of the fuel supplied to the engine, and decrease combustion efficiency.

Therefore, in order to cope with such a demand and reduce the momentary load imposed on the engine system, a torque stabilization device separate from the flywheel installed in the engine is required in order to increase the fuel efficiency used in the engine from the short and long term viewpoint .

Korean Patent No. 10-0310951: Rotating body and machine using same Korean Patent No. 10-0221965: Variable Structure of Rotational Speed of Generator for Automobile

SUMMARY OF THE INVENTION It is an object of the present invention to provide a torque stabilizing apparatus and an engine power generation system including the torque stabilizing apparatus which can stably maintain a rotational torque in a torque supplying apparatus, such as a conventional engine generator,

Another object of the present invention is to provide a torque stabilization device capable of stably responding to rapidly changing demand and efficiently coping with torque demand, and an engine power generation system equipped with the same.

According to an aspect of the present invention,

An input side transmission capable of changing the number of revolutions of the rotary input shaft, a rotation which is changed by the transmission, a rotation input shaft which is connected to the power shaft when there is a power shaft transmitting the rotation force from the outside, An output side transmission that receives the rotational force from the flywheel and changes the number of revolutions; and a rotation output shaft that receives a rotational force having a changed number of revolutions in the output side transmission and transmits the same to the demand side such as the generator.

In the present invention, the rotation ratio of the input side transmission and the output side transmission has a reciprocal relationship so that the rotation speed of the rotation input shaft and the rotation output shaft can be the same.

In the present invention, the input shaft transmission may be designed to increase the number of revolutions of the flywheel so that the number of revolutions of the flywheel is twice higher than the number of revolutions of the rotation input shaft.

According to an aspect of the present invention, there is provided an engine generator system including a torque stabilizer,

1. An engine power generation system comprising an engine for generating a rotational force by burning fuel, and a generator for generating electric power by rotating a generator shaft using a rotational force of the engine,

A torque stabilization device for stabilizing the torque of the engine is provided between the engine and the generator, and the torque stabilization device includes a rotation input shaft connected to the power shaft of the engine, an input side transmission capable of changing the rotation speed of the rotation input shaft, An output side transmission that receives the rotational force from the flywheel, and a rotation output shaft that receives a rotational force having a changed rotational speed from the output side transmission and transmits the rotational force to the generator. .

In the present invention, a plurality of torque stabilizers may be connected in series between the engine and the generator.

In the present invention, the output of the torque stabilizer may be transmitted to the plurality of generator shafts via the connection rotary shaft, the rotary shaft of the generator and the rotary shaft of each generator may be vertically coupled, and a bevel gear may be used for power transmission.

When the torque stabilizing device of the present invention is used, the torque can be stably maintained when the torque is transmitted from the torque supplying device to the torque applying place, thereby preventing vibration, noise and transmission loss of the torque due to unstable torque.

The present invention is also capable of stably responding to rapidly changing torque demand and efficiently coping with the demand for torque so that the operation of the engine can be stabilized and the momentary overload can be suppressed, The engine life can be improved.

The present invention is particularly useful in an engine power generation system in which the number of cylinders of the engine is as small as two or less in the stabilization aspect and therefore the engine has a long engine between the explosion and the explosion in the engine, It can have a great effect.

1 is a conceptual illustration showing a conventional engine generator,
Figure 2 is a conceptual illustration of an engine generator system of the present invention;
3 is a perspective view conceptually showing an embodiment of the engine power generation system of the present invention,
FIGS. 4 to 6 are an external perspective view, an internal plan view and a principal part perspective view showing an embodiment of the torque stabilizer of the present invention,
7 is a perspective view showing a combined embodiment of the torque stabilization device of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

2 is a conceptual explanatory view for explaining the engine generator system of the present invention,

Figs. 3 to 5 are an external perspective view, a perspective plan view, and a perspective view of a core portion of the torque stabilization device of the present invention.

Fig. 2 discloses an engine power generation system having a torque stabilization device 30. Fig. The system comprises an engine (10), a torque stabilizer (30), and a generator (20).

The engine 10 may be of various types, but an internal combustion engine with two or fewer cylinders is used here, particularly a one-cylinder diesel engine. A diesel engine is a four-stroke engine with two reciprocating pistons in one cycle. When the piston reciprocates also like a normal four-stroke internal combustion engine, the other end of the connecting rod connected to the piston is connected to the crank pin of the crankshaft to rotate the power shaft 11 of the crankshaft. The power shaft 11 is configured to transmit rotational force to the torque stabilizer. Although not shown, a clutch or a transmission gear box capable of interrupting transmission of rotational force may be provided between the power shaft 11 of the crankshaft and the torque stabilizer 30. [

The torque stabilizer 30 is provided between the engine 10 and the generator 30 and serves to transmit the rotational force of the engine 10 to the rotating shaft 21 of the generator 20. 4, the torque stabilizer 30 includes a rotation input shaft 31a connected to the power shaft 11 of the engine 10, an input side transmission 35a capable of changing the rotation speed of the rotation input shaft 31a An output side transmission 35b that receives the rotational force from the flywheel 36 to change the number of revolutions and an output side transmission 35b that is rotated by the output side transmission 35b, And a rotation output shaft 31b for transmitting the rotation force to the generator rotation shaft 21. Here, the respective axes and the axes are connected by using the flanges 12, 22, 32a, and 32b.

The flywheel shaft 34, the rotary input shaft 31a and the rotary output shaft 31b are rotatably supported on the wall of the case 33 through a bearing B. [

The input side transmission 35a uses a pair of spur gears 351 and 353 which are simply meshed with each other on the rotary input shaft 31a and the flywheel shaft 34 with a tooth number ratio or a gear ratio of 2: Therefore, when the rotation input shaft 31a makes one rotation, the flywheel 36 and the shaft 34 make two rotations. The output side transmission 35b also uses a pair of spur gears, each of which has a tooth ratio or a gear ratio of 2: 1 simply engaged with the rotary output shaft 31b and the flywheel shaft 34, respectively. Therefore, when the flywheel 36 and the shaft 34 make two rotations, the rotation output shaft 31b makes one rotation, and the rotation numbers of the rotation input shaft 31a and the rotation output shaft 31b are the same.

The generator rotary shaft 21 can be connected by the coupling of the rotary output shaft 31b and the flanges 22, 32b.

Generally, a shaft of a rotor, which is an armature, rotates as a rotary shaft 21 or a generator shaft, and generates electricity. Generally, the structure and principle of a generator are well known.

To explain the operation of the torque stabilizer 30 in the engine generator, first, the engine 10 is made up of four strokes, and not all the strokes are made equal in these strokes. That is, since the force due to direct explosion can be obtained only in one stroke (explosion stroke), there is a difference in the rotational force of the crankshaft during the periods corresponding to the respective strokes, and a difference in torque or torque transmitted to the torque stabilizer 30 have. In the explosion stroke, a rotational force is transmitted to the flywheel 36 via the connecting rod, the crankshaft, and the rotational input shaft, and the rotational speed increase in inverse proportion to the inertia mass of the flywheel 36 can be achieved.

The flywheel 36, which once received the rotational force from the explosion stroke, has rotational kinetic energy while being rotated. The rotational speed is increased while the engine cycle continues to reach a constant running speed. In this process, the flywheel 36 Kinetic energy continues to accumulate.

A significant amount of kinetic energy transferred to the generator is converted to electrical energy. In addition to the explosion stroke, the rotational speed of the engine 10 is maintained in accordance with the inertia. In addition to the rotational kinetic energy stored in the counterbalance of the crankshaft, all parts of the engine power generation system input through the power transmission system, The rotation output shaft 31a, the rotation output shaft 31b, the generator rotation shaft 21, and the generator. In this process, the kinetic energy stored in the flywheel 36 or the crankshaft is used during the explosion stroke.

When starting the engine 10 for the first time and reaching the stabilization stage of the engine operation, the energy due to the output of the engine, the electric power to be sent out to the outside of the generator, and the mechanical friction consumed in the middle are balanced, A stable state in which the rotational speed is maintained is achieved.

When the inertia mass of the flywheel 36 is increased, the rotational energy obtained from the explosive force of the engine is stored and the rotational state is maintained in the remaining stroke, which is more advantageous for achieving a stable rotation state. However, increasing the size of the flywheel to increase the mass of inertia increases installation space and cost, and using too large a generator output may reduce engine efficiency or fuel economy. These matters are not significantly different from the description of the torque stabilizing means such as the flywheel attached to the conventional engine.

In this embodiment, however, the flywheel 36 is provided in the torque stabilizer 30 separate from the engine, and the rotational speed of the flywheel 36 through the transmission is transmitted from the engine 10 to the generator 20 Which is greater than the number of rotations transmitted. Therefore, in this embodiment, the rotational speed of the flywheel 36 increases, and the amount of kinetic energy stored in the flywheel 36 having the same inertial mass is increased.

Particularly, since the transmissions having the same two gear ratios are provided opposite to each other to maintain the same number of revolutions of the rotary input shaft 31a and the rotary output shaft 31b, the conventional structure in which the engine 10 and the generator 20 are directly connected The kinetic energy stored in the flywheel can be increased while keeping the rotational speed of the engine and the rotational speed of the generator at the same level by simply interposing the torque stabilizer 30 between them.

When the kinetic energy stored in the flywheel 36 increases, even if the electric load suddenly increases, a considerable portion of the electric energy for covering the load to the transient before the output of the engine is sufficiently increased The burden of suddenly increasing the engine output can be alleviated. That is, when the electric load applied to the conventional generator suddenly increases, the overall rotation speed is rapidly lowered. To prevent this, the fuel supplied to the engine suddenly increases to cause unstable operation of the engine, deteriorate the combustion state, It is possible to reduce all of the problems that are easily caused by the surge of the failure.

Conversely, even when the load suddenly decreases, the number of revolutions of the generator rotation shaft 21 tends to increase. However, as the number of revolutions increases, the energy stored in the flywheel 36 increases. Therefore, A large part of the fuel is stored in the flywheel 36 and abrupt change of the rotational speed is prevented, and the fuel supplied to the engine is reduced by the role of the sensor (not shown), so that the output of the engine is balanced with the reduction of the load.

In this process, the engine power generation system may be provided with a sensor for sensing the number of revolutions of the generator or generator connection shaft, and a controller (not shown) for receiving the signal of the sensor may be provided. In this case, (Not shown) that controls the amount of fuel injected into the fuel, the number of rotations of the engine (per unit time), and the shift between the engine and the torque stabilization device. Of course, the engine power generation system may have the elements of the existing engine power generation system and its operation basically, and these elements and actions are already well known, so a separate explanation will be omitted.

6 shows an engine power generation system according to another embodiment of the present invention. In this embodiment, three torque stabilizing devices 30 are connected in series to each other so that the engine power shaft is connected to the rotary input shaft of the first torque stabilizing device, the rotary output shaft of the first torque stabilizing device is connected to the second torque stabilizing device The rotary output shaft of the second torque stabilizer is connected to the rotary input shaft of the apparatus, and the rotary output shaft of the second torque stabilizer is connected to the generator rotary shaft.

In this case, the kinetic energy stored in the flywheel can be doubled, since the number of torque stabilizers is two even if the rotational speed or the number of revolutions of the engine crankshaft is the same. This is advantageous in that when the inertia mass of the flywheel is increased in one torque stabilizer, it is difficult to increase the size of the flywheel due to the increase of the size and the installation place, etc., the torque stabilizer of the present invention can be manufactured as a standardized product and can be easily connected and used.

On the other hand, when the flywheel shaft 34, the rotary input shaft 31a, and the rotary output shaft 31b are fixed to the case 33 and the intermediate walls 33a and 33b in the torque stabilizer 30 of the present invention, It is important to minimize the resistance of rotating support devices such as bearings (B) that support these shafts, since the resistance and vibration of the shafts in the fixed portion increase the mechanical loss caused by the torque stabilizer.

FIG. 7 shows a configuration in which a plurality of generators 20 are connected to one torque stabilizer 30 in the system of the present invention to receive rotational force. In this embodiment, the output of the torque stabilizer 30 is transmitted to the plurality of generator rotary shafts 21 via the connection rotary shaft 41. The connection rotary shaft 41 and the rotary shaft 21 of each of the generators are installed vertically and receive power transmitted through the power transmission box 43. Inside the power transmission box, a bevel gear used for power transmission on the vertical axis may be installed. That is, a gear of a pair of bevel gears is installed at a predetermined position of the connection rotary shaft 41, and a generator rotation shaft having another side of the pair of bevel gears is installed perpendicularly to the connection rotation axis.

These various generators may be intended to produce power at different frequencies or electrical properties, or may be generators that produce multiple identical types of electricity with small outputs. The power transmission box may be adjustable to connect or disconnect the power transmission axis and the electrical axis of the individual generator.

The load on each of these generators is ultimately connected to the engine through a torque stabilizer. The detachment and load change of the generator is mitigated through the torque stabilizer to affect the engine. That is, even if there is a severe change in the load, the mechanical kinetic energy stored in the torque stabilizer is used first, thereby lowering the burden on the engine and increasing the output of the engine by controlling the fuel supply etc. do.

In an experiment in which a 4-cylinder small-sized diesel engine and 12 10-kW generators were connected to each other, when an engine and a generator connection shaft were directly connected without the torque equalizing device of the present invention and an average load of 70% was connected to the generator after the engine was started, When the torque equalizing device of the present invention is connected between the engine and the generator connecting shaft, there is a slight difference in the fluctuation in load time, but the torque equalizing device The fuel efficiency can be increased by about 20 ~ 30% compared with the case without the fuel efficiency.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. .

10; Engine 11: Power shaft
20: generator 21: rotating shaft (generator rotating shaft)
30: torque stabilizer 31a: rotary input shaft
31b: rotation output shaft 33: case
34: flywheel shaft 35a: input side transmission
35b: output side transmission 36: flywheel
41: connecting rotation shaft 43: power transmission box

Claims (5)

delete delete delete An engine for generating a rotational force by burning fuel,
And a generator for generating electric power by rotating the generator shaft using the rotational force of the engine,
A plurality of torque stabilization devices are connected in series between the engine and the generator,
Each of the torque stabilization devices includes a rotation input shaft connected to the first external rotation shaft to receive a rotational force, an input side transmission for transmitting the rotation input shaft to the flywheel shaft with an increase in the number of revolutions of the rotation input shaft, An output side transmission that receives a rotational force from the flywheel shaft and reduces the number of rotations; and a rotation output shaft that receives a rotational force from the output side transmission and transfers the rotational speed to a second external rotational shaft. 5. The method of claim 4,
Wherein the engine is an internal combustion engine having two or less cylinders.

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