JP2009299633A - Engine working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine working machine capable of preventing oil component from flowing out to an outside and of being miniaturized by reducing volume of an oil fence. <P>SOLUTION: This working machine is provided with a diesel engine 11 driving a working machine such as a generator 12, a fuel tank 15 storing fuel to be supplied to the engine, a fuel system provided between the fuel tank and the engine, and the oil fence disposed 26 below the engine, the fuel tank and the fuel system, and is provided with a liquid level sensor (high liquid level sensor 29) detecting liquid level in the oil fence, and a control means performing emergency stop of the engine when the liquid level sensor detects a predetermined liquid level. The control means is provided with a selection means switching emergency stop between valid and invalid. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an engine work machine, and more particularly, to an engine work machine that drives work equipment such as a generator and a compressor by an engine.

Engine work machines that drive various work machines such as generators, compressors, hydraulic units, etc., are in operation at sites such as construction and civil engineering, or at disaster sites and shelters. These engine working machines have a built-in fuel tank for supplying fuel to the engine. When long-term continuous operation without oiling is required, install a large-capacity fuel tank. ing. Also, under the engine or fuel tank, the lower frame of the engine work machine is shielded to prevent oil from leaking out of the engine work machine when oil such as fuel leaks due to damage to equipment. An oil bank is formed (for example, refer to Patent Document 1).
JP 2000-265848 A

  For example, if the fuel return pipe of the fuel system breaks during operation, the engine will continue to operate without stopping, and fuel supply from the fuel tank to the engine will continue. Is sucked up by the fuel feed pump, leaks from the damaged portion of the fuel return pipe, and flows into the oil barrier. Therefore, when a large-capacity fuel tank is mounted, the volume of the oil barrier must be increased in accordance with the capacity of the fuel tank, which leads to an increase in the size of the engine work machine and the transportation of the engine work machine. It becomes an obstacle. Furthermore, considering that rainwater enters the oil breakwater during operation in rainy weather, it is necessary to set the volume of the oil breakwater to be greater than the capacity of the fuel tank, leading to a further increase in the size of the engine work equipment. Become.

  Accordingly, an object of the present invention is to provide an engine working machine that can prevent the oil from flowing out to the outside and reduce the volume of the oil barrier to reduce the size.

  In order to achieve the above object, an engine work machine according to the present invention includes an engine that drives the work machine, a fuel tank that stores fuel to be supplied to the engine, and a fuel that is provided between the fuel tank and the engine. In an engine working machine comprising a system, the engine, the fuel tank, and an oil breaker disposed below the fuel system, a liquid level sensor for detecting a liquid level in the oil breakage bank, and the liquid level sensor Is provided with a control means for emergency stopping the engine when a preset liquid level is detected.

  Further, the control means makes an emergency stop of a fuel feed pump provided in the fuel system, and the control means comprises a selection means for switching the emergency stop to be valid or invalid, The fuel tank may be housed in the oil breakwater.

  According to the engine working machine of the present invention, since the engine is stopped when the liquid level in the oil breakwater rises to a preset height, the leakage of fuel from the fuel system can be stopped, and the oil breakwater It is possible to prevent oil from flowing out to the outside. In addition, when the fuel system is provided with a fuel feed pump that operates regardless of the operating state of the engine, the fuel leakage can be stopped by stopping the fuel feed pump. Furthermore, depending on the use of the engine work machine, an unexpected emergency stop of the engine work machine may be a big problem. When the engine work machine is used for an application in which continuation of operation has priority over oil spill, it is possible to avoid an emergency stop of the engine work machine.

  FIGS. 1 to 3 show an embodiment in which the engine working machine of the present invention is applied to an engine generator. FIG. 1 is a sectional front view in which a part of the engine generator is omitted, and FIG. 3 is a plan view, and FIG. 4 is a flowchart showing an operation example of the control means.

  The engine working machine shown in the present embodiment is a portable engine generator that drives a generator 12 by a diesel engine 11, and the diesel engine 11 is mounted on a gantry 14 provided at a lower portion of a casing 13 having a soundproof structure. The generator 12 is arranged in the horizontal direction, and a large-capacity fuel tank 15 is disposed below the gantry 14.

  A battery 16, a radiator 17, an air cleaner 18, an exhaust pipe 19, and the like necessary for the operation of the diesel engine 11 are arranged on the diesel engine 11 side on the gantry 14, and the diesel engine 11 and power generator are arranged on the generator 12 side. A control panel 20 having control means for controlling the machine 12 and the like is provided. A fuel system including a fuel feed pump 21, a fuel supply pipe 22, and a fuel return pipe 23 is provided between the diesel engine 11 and the fuel tank 15.

  An oil breakwater 26 whose bottom and four sides are sealed by a bottom plate 24 and a side wall 25 is provided at the bottom of the gantry 14 so as to surround the lower half of the fuel tank 15. A drain 27 for discharging the liquid in the oil breakwater 26 is provided below the side wall 25 on the generator 12 side, and the liquid level in the oil breakwater 26 is preset in the oil breakwater 26. A high liquid level sensor 28 that outputs a high liquid level signal when the liquid level in the oil barrier 26 reaches the set amount and the liquid level in the oil barrier 26 is the high liquid level. A low liquid level sensor 29 is provided for outputting a low liquid level signal when a preset low liquid level lower than the level is reached.

  When the control means provided in the control panel 20 receives the low liquid level signal from the low liquid level sensor 29, the control means notifies the fact that the liquid level in the oil barrier 26 has increased to a low liquid level. An alarm is output with a lamp or buzzer. Further, when a high liquid level signal is received from the high liquid level sensor 28, the operation of the diesel engine 11 is controlled according to the procedure shown in the flowchart of FIG.

  In FIG. 4, first, the power of the work machine (engine generator) is turned ON (step 51) on the control panel 20 and when the work machine is in an operating state (step 52), the high level sensor 28 The presence or absence of a high liquid level signal is determined. When the liquid amount in the oil breakwater 26 reaches the set amount and a high liquid level signal is received, the process proceeds from step 53 to step 54 (Yes), and it is determined whether the emergency stop function is valid or invalid. Normally, since the emergency stop function is set to be effective, the routine basically proceeds from step 54 to step 55 (Yes), the diesel engine 11 and the fuel feed pump 21 are emergency stopped, and the work implement is turned off at step 56. The diesel engine 11 is stopped and reset. By discharging the liquid in the oil breakwater 26 from the drain 27 in this state, the operation of the work machine can be resumed.

  When the fuel feed pump 21 is an electric one that operates independently by turning on the main switch of the control panel 20 regardless of the operating state of the diesel engine 11, the fuel feed pump is simultaneously with the injection pump of the diesel engine 11. By cutting off the power supply 21 and making an emergency stop, the fuel leakage can be stopped even when the fuel leakage has occurred on the downstream side of the fuel feed pump 21, and the oil content can be discharged from the oil barrier 26 to the outside. It can be surely prevented.

  On the other hand, depending on the use of a work machine such as an engine generator, the emergency stop function can be set to be invalid because the emergency stop of the work machine may be a big problem. For example, when an engine generator is used as an emergency power source in the event of a disaster or when a compressor or hydraulic unit of a work machine is used in an emergency, the work machine is more likely to leak than oil leakage from the oil breakwater 26. When continuation of operation has priority, the emergency stop function is disabled.

  When the emergency stop function is disabled, the process proceeds from step 54 to step 57 (No), and the normal operation state is continued regardless of the presence or absence of the high liquid level signal from the high liquid level sensor 28. The engine stop of the work implement at step 58 is performed by turning off the starter key of the work implement on the control panel 20.

  As described above, in an operation at a normal construction site or the like, the diesel engine 11 and the fuel feed pump 21 are emergency-stopped when the liquid level in the oil breakwater 26 rises, so that the fuel system, the fuel feed pump 21, etc. Even when the container is damaged and fuel leaks, the oil can be reliably prevented from flowing out from the oil breakwater 26 to the outside. Thereby, even when a large-capacity fuel tank 15 is installed, the volume of the oil barrier 26 can be reduced, and the engine working machine can be downsized. In addition, the fuel tank 15 can be increased in size to the full limit of transportation, and the time for continuous operation without oiling can be extended.

  Furthermore, if rainwater enters the oil breakwater 26 during operation in rainy weather, oil may flow out of the oil breakwater 26 even if a slight fuel leak occurs. By making an emergency stop according to the liquid level, it is possible to reliably prevent oil from flowing out from the oil breakwater 26 even when rainwater enters.

  In addition, by providing a selection means to enable or disable emergency stop of the engine or fuel feed pump, for example, a generator that supplies power to the medical site for emergency use in the event of a disaster, air to the disaster site, for example It is used as a drive source for compressors to be supplied, hydraulic units of cranes to remove unnecessary items at disaster sites, and when used in important applications such as lifesaving, engine work rather than oil spill from engine work equipment Priority can be given to continued operation of the machine, and accidents due to inadvertent engine stoppage can be prevented.

  Although the oil breakwater 26 shown in this embodiment is provided in a state surrounding the lower half of the fuel tank 15, the entire fuel tank 15 is accommodated in the oil breakwater 26. It can also be provided.

It is the cross-sectional front view which abbreviate | omitted a part of engine generator. It is a side view similarly. It is also a plan view. It is a flowchart which shows the operation example of a control means.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Diesel engine, 12 ... Generator, 13 ... Casing, 14 ... Mount, 15 ... Fuel tank, 16 ... Battery, 17 ... Radiator, 18 ... Air cleaner, 19 ... Exhaust pipe, 20 ... Control panel, 21 ... Fuel feed pump , 22 ... Fuel supply pipe, 23 ... Fuel return pipe, 24 ... Bottom plate, 25 ... Side wall, 26 ... Oil barrier, 27 ... Drain, 28 ... High liquid level sensor, 29 ... Low liquid level sensor

Claims (4)

  An engine for driving the working machine; a fuel tank for storing fuel to be supplied to the engine; a fuel system provided between the fuel tank and the engine; and the engine, the fuel tank, and a lower part of the fuel system In the engine working machine provided with an oil breakwater disposed in the engine, a liquid level sensor that detects a liquid level in the oil breakwater, and the engine when the liquid level sensor detects a preset liquid level height An engine working machine comprising: a control means for emergency stop.   2. The engine working machine according to claim 1, wherein the control means makes an emergency stop of a fuel feed pump provided in the fuel system.   The engine working machine according to claim 1 or 2, wherein the control means includes selection means for switching the emergency stop to be valid or invalid.   The engine work machine according to any one of claims 1 to 3, wherein the fuel tank is accommodated in the oil barrier.

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