JP2017153221A - Engine generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine generator capable of preventing a non-combusted fuel or carbon from being stagnated within a muffler, while attaining improvement of workability.SOLUTION: To an alternator 13 which is rotated together with a diesel engine 12, a motor 15 which generates a torque in a direction reverse to a rotation direction of the alternator 13 from power from the alternator 13 is connected integrally, and a switch 14 is provided for powering-on/powering-off. If light-output operation is continued, the switch is turned on, the motor 15 is connected to the alternator 13, and reproduction of an exhaustion system is performed by implementing high-output reproducing operation until the lapse of a preset time.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an engine generator, and more particularly, to an engine generator that supplies electric power to a device such as a submersible pump that is operated by switching between start and stop according to fluctuations in water level.

  Engine generators that use a diesel engine as the drive source for the generator are used in a wide range of applications such as construction sites. For example, when an engine generator is used as a power source for a water pump in river construction, the pump is started. In consideration of the current, it is necessary to use an engine generator having a power generation capacity that is five times or more the power required for steady operation of the pump. For this reason, during the pump operation, the engine generator may be operated at a light load (low load) for a long time of 20 hours to 30 hours, and the combustion temperature in the cylinder is lowered and unburned fuel or There is a possibility that various troubles such as carbon mixed into the exhaust gas and accumulated in the muffler and become clogged may occur. In particular, the third exhaust gas regulation-compliant engine has a problem that unburned fuel and carbon tend to accumulate in the muffler.

  For this reason, after operating the engine generator at a light load for a predetermined time, a load device was connected to the engine generator, the load of the diesel engine was increased, the temperature of the exhaust gas was raised, and the exhaust gas was accumulated in the muffler by the high temperature exhaust gas There has been a regeneration operation in which unburned fuel and carbon are burned and removed (see, for example, Patent Document 1).

JP 2014-143790 A

  However, in Patent Document 1 described above, as shown in FIG. 9, an external load device 24 is connected to an alternator 23 connected to the diesel engine 22 of the engine generator 21 to perform a high output regeneration operation. However, the load device 24 has to be prepared at the work site, and it may be difficult to change the wiring depending on the situation at the work site.

  Therefore, an object of the present invention is to provide an engine generator capable of preventing unburned fuel and carbon from accumulating in a muffler while improving workability.

  In order to achieve the above object, the engine generator of the present invention, when the light output operation is continued, applies a load to the diesel engine, performs a high output regeneration operation, and performs regeneration of the exhaust system, The alternator that rotates together with the diesel engine is integrally connected to a motor that generates a rotational force in a direction opposite to the rotation direction of the alternator by the electric power from the alternator, and a switch for turning on and off the electric power is provided. Yes.

  According to the engine generator of the present invention, after the engine generator is operated at a light load for a predetermined time, the switch is turned on and the motor is connected to the alternator. In addition to the load output from the alternator, the reverse direction It is possible to apply a load on the diesel engine by the motor that is going to rotate, to raise the exhaust temperature, and to prevent unburned fuel and carbon from accumulating in the muffler. Further, since the motor is provided integrally with the alternator, it is not necessary to change the wiring at the work site as in the prior art, and the regeneration operation can be easily performed.

It is an electric circuit diagram of the engine generator which shows the 1st form example of this invention. It is explanatory drawing of an alternator and a motor similarly. It is explanatory drawing when a motor is similarly connected with the alternator. It is explanatory drawing of the alternator when a motor is similarly connected to the alternator. It is explanatory drawing of a motor at the time of connecting a motor to an alternator similarly. It is a principal part side view of an engine generator similarly. It is a principal part sectional front view of an engine generator similarly. It is a principal part sectional front view of the engine generator at the time of connecting a motor to an alternator. It is explanatory drawing of the conventional engine generator.

  FIG. 1 to FIG. 8 are views showing an embodiment of the engine generator of the present invention. The engine generator 11 of this embodiment is used as a power source of a water pump for river construction, for example. Has control means for switching between starting and stopping according to the water level.

  As shown in FIG. 1, the engine generator 11 of the present embodiment automatically generates an alternator 13 driven by a diesel engine 12 and a voltage output from the alternator 13 in the same manner as a general engine generator. And an automatic voltage regulator (AVR) for adjustment. A three-phase motor 15 that can be turned on and off by a switch 14 is coaxially connected to the alternator 13. The three-phase windings U, V, and W of the motor 15 are connected to the three-phase windings U, V, and W of the alternator 13, and The two phases are switched and connected via the switch 14.

  3 to 5 together, when the diesel engine 12 rotates in the direction of arrow A, a force in the direction of arrow A is also applied to the alternator 13 and the direction of the magnetic field is in the direction of arrow B. According to the law, a current flows in the direction of arrow C through each of the three-phase windings U, V, W of the alternator 13. When the switch 14 is turned on and the three-phase windings U, V, and W of the alternator 13 are connected to the three-phase windings U, V, and W of the motor 15, the arrows appear on the three-phase windings U, V, and W of the motor 15. Since current flows in the direction C and the direction of the magnetic field is in the direction of arrow B, the motor 15 tries to rotate in the direction of arrow D, which is opposite to the direction of rotation of the diesel engine 12, according to Fleming's left-hand rule. Power works. Thereby, it will be in the state where the brake was applied to the diesel engine 12, and the load of the diesel engine 12 will rise.

  In the engine generator 11 described above, the switch 14 is turned off and the alternator 13 and the motor 15 are disconnected as shown in FIG. 7, for example, used as a power source for a water pump in river construction. When the light load operation of the diesel engine 12 continues, as shown in FIG. 8, the switch 14 is turned on, and the three-phase windings U, V, W of the alternator 13 and the three-phase winding U, By connecting V and W, the diesel engine 12 is operated at a high output, a regeneration operation is performed to raise the temperature of the exhaust gas, and the unburned fuel and carbon accumulated in the muffler are burned and removed by the high temperature exhaust gas. .

  As described above, according to the engine generator 11 of the present embodiment, the regeneration operation can be easily performed by connecting the motor 15 to the alternator 13 by operating the switch 14. Further, since the motor 15 is provided integrally with the alternator 13, it is not necessary to change the wiring at the work site as in the prior art, and the regeneration operation can be easily performed.

  In the present invention, the switch may be manually operated to start / end the regeneration operation, or the switch may be automatically operated to start / end the regeneration operation.

DESCRIPTION OF SYMBOLS 11 ... Engine generator, 12 ... Diesel engine, 13 ... Alternator, 14 ... Switch, 15 ... Motor

Claims (1)

  When the light output operation is continued, an engine generator that loads the diesel engine, performs a high output regeneration operation, and regenerates the exhaust system is supplied to the alternator rotating together with the diesel engine by the electric power from the alternator. An engine generator, wherein a motor for generating a rotational force in a direction opposite to the rotational direction of the alternator is integrally connected and a switch for turning on and off the electric power is provided.

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