JP4408853B2 - Engine working machine - Google Patents

Description

  The present invention relates to an engine working machine including an engine that drives liquefied gas stored in a liquefied gas cylinder as fuel, and a work machine that receives power from the engine and performs predetermined work.

  Some of these engine working machines are configured to take out a liquefied gas (liquid fuel) from a liquefied gas cylinder, mix the heated and vaporized gaseous fuel with air, and send the mixed gas to the engine. . For this reason, such an engine working machine needs a means for heating and vaporizing the liquid fuel.

  Therefore, a tail pipe is connected to the silencer, and a heat transfer plate is attached to the tip of the tail pipe to contact the liquefied gas cylinder body to conduct heat, and the high temperature exhaust discharged from the silencer is guided to the tail pipe. Patent Document 1 discloses a method for heating and vaporizing liquid fuel by transferring the heat of exhaust gas to a liquefied gas cylinder through a tail pipe and a heat transfer plate.

  Also, a method of heating and vaporizing liquid fuel by disposing a vaporizer near the outside of the cylinder block, which is a high temperature part of the engine, enabling the vaporizer to be heated, and flowing the liquid fuel taken out from the liquefied gas cylinder to the vaporizer 2.

Japanese Utility Model Publication No. 2-118158 JP-A-7-301154

  The one described in Patent Document 1 heats the liquefied gas cylinder itself and can promote the vaporization of the liquid fuel in the liquefied gas cylinder. However, since sufficient heating cannot be performed at the initial start of the engine, There is a possibility that the liquid fuel is insufficiently vaporized and the engine cannot be cold started.

  On the other hand, the vaporizer described in Patent Document 2 has a certain length and is disposed in the vicinity of the cylinder block. For this reason, the amount of heat supplied from the engine to the cylinder block is substantially constant regardless of the outside air temperature. As a result, when the length of the vaporizer is set so that the liquid fuel flowing through the vaporizer can be vaporized when the installation environment such as summer is hot, the temperature of the liquid fuel flowing through the vaporizer is low when the installation environment such as winter is low. As a result, the liquid fuel may be insufficiently vaporized. In the opposite case, that is, when the length of the vaporizer is set in accordance with the winter season, the vaporization of the liquid fuel flowing through the vaporizer may become excessive in the summer season. In other words, the device described in Patent Document 2 has a problem that the liquid fuel may be insufficiently vaporized or excessively vaporized depending on the outside air temperature, and a stable engine cannot be operated.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide an engine working machine capable of cold starting of an engine and capable of stable operation of the engine regardless of the environmental temperature. To do.

  In order to solve such a problem, the present invention heats and vaporizes liquid fuel supplied from a liquefied gas cylinder by a vaporizer disposed near the outside of the cylinder block of the engine and mixes it with air. In an engine working machine in which an engine is driven using air as fuel and the working machine performs a predetermined work by receiving power from the engine, the vaporizer includes a first flow path having a short flow path length used when the outside air temperature is high, It is characterized by comprising two channels of a second channel having a long channel length used when the outside air temperature is low, and the first channel and the second channel can be selectively switched.

  According to the present invention, the vaporizer includes two channels of a first channel and a second channel having different channel lengths, and these channels can be selectively switched, so that the environmental temperature Accordingly, by switching the flow path of the vaporizer, the liquid fuel supplied from the liquefied gas cylinder can be heated and vaporized without always being sufficiently and excessive. For this reason, the engine can always be stably operated regardless of the environmental temperature, and a cold operation at the time of starting the engine can be enabled.

  Further, the present invention provides a temperature detection means for detecting the outside air temperature, a direction switching valve for flowing the liquid fuel supplied from the liquefied gas cylinder to the first flow path or the second flow path, and a detection value detected by the temperature detection means. And an operation control means for controlling the operation of the direction switching valve accordingly.

  According to this invention, by providing the temperature detection means, the direction switching valve, and the operation control means, the flow path of the vaporizer can be appropriately switched according to the environmental temperature. For this reason, the cold operation at the time of starting the engine can be reliably performed, and the operation operation during the engine operation can be further stabilized.

In the present invention, a liquefied gas cylinder that stores liquid fuel is disposed on one side of the case, and an engine that is driven by vaporized gas fuel that is supplied from the liquefied gas cylinder is disposed on the other side of the case. In an engine working machine in which a vaporizer for vaporizing liquid fuel supplied from a liquefied gas cylinder is disposed at a position near the outside of a cylinder block of an engine, and a working machine for performing a predetermined work by receiving power from the engine is disposed in a case. Cooling provided on the liquefied gas cylinder side from the engine by forming a ventilation passage between the outer periphery of at least the crankcase and cylinder block of the engine and the case, and providing heating means in the case around the crankcase The fan takes in outside air from the air intake of the case provided in the vicinity of the crankcase, and this outside air is While heating the outer periphery of the engine by flowing the air flow path is heated Te, heating the vaporizer may be configured to discharge from the exhaust port of the casing to the outside of the case.

According to the above invention, the ventilation passage is formed between the engine and the case, the heating means is disposed in the case around the crankcase, and the outside air is taken in from the intake port of the case by the cooling fan. Since the outside air is heated by the heating means and flows through the ventilation passage to heat the outer periphery of the engine, and the vaporizer is heated, when the heating means is operated at the cold start, the engine and the vaporizer are heated. Vaporization of the liquid fuel flowing through the vaporizer can be facilitated to allow a cold start of the engine. In particular, the vaporizer is effective when the length of the vaporizer is designed to be short in accordance with the summer. In other words, when the vaporizer is designed for the summer season and heated by heating means when the environmental temperature is low, the vaporization of the liquid fuel by the vaporizer can be promoted. Vaporization is sufficient, and cold start can be performed reliably.

Also the heating means may be operated by receiving power supply from the power source provided outside the case.

According to the above heating means , the heating means operates by receiving power supply from a power source provided outside the case, so that it is not necessary to provide a dedicated power source for driving the heating means in the case. The machine can be reduced in size and weight.

  Furthermore, the working machine of the present invention is a generator that generates power by receiving power from an engine.

  According to the present invention, since the working machine is a generator, it is possible to provide an engine generator that can start the engine cold and can stably operate the engine regardless of the environmental temperature.

  According to the engine working machine according to the present invention, the vaporizer includes two channels of the first channel and the second channel having different channel lengths, and these channels can be selectively switched. Thus, it is possible to provide an engine working machine that can start the engine cold and can stably operate the engine regardless of the environmental temperature.

  A preferred embodiment of an engine working machine according to the present invention will be described below with reference to FIGS. In the present embodiment, a hand-held gas engine generator will be described as an example. 2 shows an internal structure diagram of the gas engine generator in a right side view, FIG. 3 shows an internal structure diagram of the gas engine generator in a plan view, and FIG. 5 shows a rear perspective view of the gas engine generator. 6 shows an internal structure diagram of the gas engine generator in the left side view, and FIG. 7 shows the case bottom in the plan view.

[First embodiment]
As shown in FIG. 1 (perspective view), FIG. 2 and FIG. 3, the gas engine generator 1 includes a case 10 formed in a box shape, an engine 40 driven by using liquefied gas as fuel, and power from the engine 40. And a generator 50 that generates electric power upon receipt.

  The case 10 is made of a synthetic resin material and includes a left side cover 11, a right side cover 12, a front cylinder cover 13 and a rear cover 14. The left side cover 11 and the right side cover 12 are configured to be substantially bilaterally symmetric. When these are arranged opposite to each other, a space 16 capable of accommodating the engine 40, the generator 50, and the like is formed therein, and the upper side extends in the front-rear direction. A handle 18 is formed, a front opening 20 extending in the vertical direction is formed at the front end, and an inspection opening 22 is formed at the upper rear side. The left side cover 11 and the right side cover 12 are fastened and integrated by fastening means of bolts and nuts in a state of being opposed to each other.

  The front cylinder cover 13 covers the front opening 20, and the upper side is rotatable in the front-rear direction with the lower end portion as a rotation fulcrum. When the front opening 20 is opened by the front cylinder cover 13, the side surfaces of the liquefied gas cylinder 30 and the mounting section 60 to which the liquefied gas cylinder 30, which will be described later, and the liquefied gas cylinder 30 are installed are exposed. Can do. The front cylinder cover 13 is provided with a plurality of holes 13a for exposing a lamp 65, a switch 66, an outlet 67 and the like attached to a panel 63 described later.

  The panel 63 is attached to the front end portion of the base plate 24 attached to the bottom portion in the case 10 via a support member 64, and vertically along the inner surface of the front cylinder cover 13 with the front opening 20 closed. It extends to. The panel 63 is provided with the lamp 65, the switch 66, the outlet 67, and the like. When the front opening 20 is closed by the front cylinder cover 13, the lamp 65, the switch 66, the outlet 67, etc. are attached to the front cylinder cover 13. It is inserted into the hole 13a corresponding to each of the plurality of holes 13a provided.

  The rear cover 14 covers the inspection opening 22, and will be further described with reference to FIG. 4. When the rear cover 14 is further described, a plurality of exhaust ports 14 a are provided at the rear, and an insertion hole (through which a wire connected to an operation knob 45 a described later is passed on the left side ( (Not shown) is provided. The rear cover 14 is fixed to the left side cover 11 and the right side cover 12 integrated by fastening means (not shown). The inspection opening 22 is formed such that the upper rear portion of the case 10 and the upper portions of the left and right side surfaces on the rear side of the case are opened. Maintenance of the engine 40 accommodated in the case 10 and operation of an operation lever of a direction switching valve described later can be performed through the inspection opening 22.

  The engine 40, the cooling fan 52, the generator 50, the mounting portion 60, and the panel 63 are attached from the rear side to the front side on the base plate 24 at the bottom in the space 16 of the case 10 configured as described above.

  As shown in FIGS. 2, 3, and 5, the engine 40 is a so-called four-cycle engine, and includes a crankcase 41, a cylinder block 42, a cylinder head 43, and a head cover 44. A regulator 70 is attached to the left side surface of the cylinder head 43, and an air cleaner 72 is attached to the left side of the cylinder head 43 via an intake pipe. A muffler 74 is attached to the rear end portion of the exhaust pipe extending from the right side surface of the cylinder head 43.

  A vaporizer 75 is connected to the regulator 70 via a fuel pipe 62 '. The vaporizer 75 is a tubular member and has two systems of flow, a first flow path 75a having a short flow path length used when the outside air temperature is high and a second flow path 75b having a long flow path length used when the outside air temperature is low. It has a road. For this reason, since the first flow path 75a has a flow path length shorter than that of the second flow path 75b, the amount of heating received from the engine 40 is small, and the second flow path 75b receives a larger heating amount than the first flow path 75a. Become.

  One end of the first flow path 75a is connected to the fuel pipe 62 ', and the other end is curved in a U shape on the rear side of the cylinder block 42 of the engine 40 and extends in the lateral direction to the space 16 on the left side of the engine. It is connected to the output side port of the arranged direction switching valve 80. The second flow path 75b has one end connected to the fuel pipe 62 'and the other end meandering in an S shape on the rear side of the cylinder block 42 of the engine 40 and extending in the lateral direction. Connected to the output port.

  The direction switching valve 80 is a three-port two-position manual switching valve. When an operation lever (not shown) is operated, the fuel pipe 62 connected to the input side port of the direction switching valve 80 and the first flow path 75a or the second flow path. 75b communicates. The direction switching valve 80 may be automatically switched. In this case, the direction switching valve 80 is an electromagnetic type switching valve, and a temperature sensor 81 for detecting the outside air temperature is provided in the case 10, and the operation of the direction switching valve 80 is controlled according to the detection value detected by the temperature sensor 81. A controller 82 is provided in the case 10. The controller 82 operates the direction switching valve 80 so that the fuel pipe 62 and the first flow path 75a communicate with each other when the detection value from the temperature sensor 81 is within the set range. The direction switching valve 80 is switched so that the pipe 62 and the second flow path 75b communicate with each other. By controlling the operation of the direction switching valve 80 in this way, the flow paths 75a and 75b of the vaporizer 75 can be appropriately switched according to the environmental temperature, and the engine can be reliably started cold. Driving operation during operation can be further stabilized.

  The liquid fuel supplied from the liquefied gas cylinder 30 flows through the fuel pipe 62, and the end of the fuel pipe 62 is connected to the input side port of the direction switching valve 80 described above. Therefore, the liquid fuel supplied from the liquefied gas cylinder 30 flows through the fuel pipe 62, passes through the direction switching valve 80, flows in the vaporizer 74 heated by the heat from the engine 40, and is heated and vaporized.

  The crankcase 41 of the engine 40 is provided with a starter portion 45 that starts the engine 40 by rotating the crankshaft 41a when a rope 45b connected thereto is pulled by an operation knob 45a attached to an end portion. The operation knob 45a is disposed outside the left side cover 11 so that the rope 45b can be pulled.

  The generator 50 is attached to the tip of a crankshaft 41a that extends forward from the crankcase 41 of the engine 40, and generates power according to the rotation of the crankshaft 41a.

  The cooling fan 52 is disposed between the generator 50 and the engine 40 and is disposed coaxially with the crankshaft 41a, and the rotating blades 53 are rotated according to the rotation of the crankshaft 41a.

  A pair of mounting portions 60 are provided at predetermined intervals in the left-right direction, and a connecting portion 61 is attached between the mounting portions 60. A supply channel (not shown) for flowing the liquid fuel supplied from the liquefied gas cylinder 30 mounted on the mounting unit 60 is formed in the mounting unit 60 and the connection unit 61, and the supply channel is connected to the connection unit 61. The fuel pipe 62 communicated with each other. The mounting portion 60 includes a contact portion 60a with which the head 32 of the liquefied gas cylinder 30 is detachably contacted.

  The liquefied gas cylinder 30 attached to the mounting part 60 includes a cylinder main body 31 that stores the liquid fuel L and a head 32 that protrudes from the tip of the cylinder main body 31, with the fuel outlet facing downward. It is arranged vertically and is detachably mounted on the mounting portion 60. When the liquefied gas cylinder 30 is mounted on the mounting portion 60, an on-off valve (not shown) provided in the head 32 opens, and the liquid fuel L in the liquefied gas cylinder 30 flows through the mounting portion 60, and the fuel pipe 62. And flows through the vaporizer 74 and is supplied to the regulator 70.

  An inverter 76 is attached to the left end portion of the base plate 24. The inverter 76 is formed in a box shape, is arranged vertically, and is electrically connected to the generator 50 via a harness, a connector, or the like, and the electric power generated by the generator 50 is 50 Hz or 60 Hz. It has a function of converting to alternating current and supplying it to the outlet 67 shown in FIG.

  In order to start the gas engine generator 1 configured as described above, first, the rear cover 14 is removed, and the operator operates the operation lever of the direction switching valve 80 in accordance with the environmental temperature so that the fuel pipe 62 and the vaporizer 75 are connected. The first flow path 75a or the second flow path 75b is connected. Then, the rear cover 14 is attached to the case 10, and the operation knob 45a is pulled to start the engine 40. At this time, the liquid fuel supplied from the liquefied gas cylinder 30 flows through the fuel pipe 62 and flows into the first flow path 75a or the second flow path 75b selected and operated through the direction switching valve 80 to be heated and vaporized. Is done.

  The gaseous fuel heated and vaporized by the vaporizer 75 flows into the regulator 70 and is mixed with the air from the air cleaner 72 to become an air-fuel mixture. Then, this air-fuel mixture is supplied to the engine 40 and the engine 40 is driven. Then, the generator 50 receives power from the engine 40, generates power, is converted into desired power by the inverter 76, and is supplied to the outlet 67 shown in FIG.

  As described above, the paperizer 75 includes two channels of the first channel 75a and the second channel 75b having different channel lengths, and these channels are selectively switched by the direction switching valve 80. The liquid fuel is vaporized without being excessive and excessive, mixed with air, and supplied to the engine 40. As a result, the engine 40 can always be stably operated regardless of the environmental temperature, and the engine can be cold-started.

[Second Embodiment]
Next, a second embodiment of the engine generator according to the present invention will be described. In the second embodiment, only differences from the first embodiment will be described, and the same reference numerals will be given to the same aspects as those in the first embodiment, and the description thereof will be omitted.

  As shown in FIGS. 1, 3, and 5, a plurality of air intakes 85 are provided on the rear side surfaces of the left side cover 11 and the right side cover 12, and are disposed between the outside of the engine 40 and the inside of the case 10. The space 16 forms a ventilation flow path 86 through which air can flow and communicate. Further, the vaporizer 75 is configured to have only the first flow path 75a, and the fuel pipe 62 is directly connected to the first flow path 75a. Further, a heater 87 is disposed in the ventilation flow path 86 below the crankcase 41 of the engine 40 as shown in FIGS. The heater 87 is a so-called sheathed heater and is formed in a U shape in plan view. The heater 87 is electrically connected to a power source 88 provided outside the case 10. The power source 88 may be an AC power source or a DC power source supplied from an automobile and converted into an alternating current through a DC-AC inverter.

  In this way, the ventilation channel 86 is formed between the engine 40 and the case 10, and the heater 87 is disposed in the ventilation channel 86 below the crankcase 41, so that the heater 87 generates heat during cold start. Then, the outside air is taken in from the air inlet 85 shown in FIG. 4 of the case 10 by the cooling fan 52, and this outside air is heated by the heater 87 and flows through the ventilation passage 86 to heat the outer periphery of the engine 40. The vaporizer 75 is heated and discharged from the case 10 through the exhaust port 14a shown in FIG. That is, by causing the heater 87 to generate heat, the engine 40 and the vaporizer 75 are heated, so that the vaporization of the liquid fuel flowing through the vaporizer 75 is promoted, and the engine 40 can be cold-started. That is, since the vaporizer 75 is the first flow path 75a having a short length, when the heater 87 generates heat when the environmental temperature is low, the vaporization of the liquid fuel by the vaporizer 75 is promoted, and the liquid fuel is sufficiently vaporized. Thus, the cold start of the engine 40 can be reliably performed.

  In the embodiment described above, the gas engine generator 1 is shown as an example of the engine working machine, but a portable working machine of a hand-held blower may be used.

The front side perspective view of the gas engine generator concerning one embodiment of the present invention is shown. The internal structure figure in the right side view of a gas engine generator is shown. The internal structure figure in planar view of a gas engine generator is shown. The rear perspective view of a gas engine generator is shown. The rear perspective view of the gas engine generator with which the opening part for inspection opened was shown. The internal structure figure in the left view of a gas engine generator is shown. The top view of the case bottom part of the gas engine generator equipped with the heater is shown.

Explanation of symbols

1 Gas engine generator (engine work machine)
10 Case 30 Liquefied Gas Cylinder 40 Engine 41 Crank Case 42 Cylinder Block 50 Generator (Working Machine)
52 Cooling fan 75 Paperizer 75a First flow path 75b Second flow path 80 Direction switching valve 81 Temperature sensor (temperature detection means)
82 controller (operation control means)
85 Intake port 86 Ventilation channel 87 Heater (heating means)
88 Power supply L Liquid fuel

Claims (3)

The liquid fuel supplied from the liquefied gas cylinder is heated and vaporized by a vaporizer disposed in the vicinity of the outside of the cylinder block of the engine and mixed with air, and the engine is driven by using the mixed gas as fuel. In the engine work machine where the work machine receives the power of
The vaporizer comprises two channels, a first channel with a short channel length used when the outside air temperature is high and a second channel with a long channel length used when the outside air temperature is low,
The engine working machine, wherein the first flow path and the second flow path are selectively switchable.   Temperature detection means for detecting the outside air temperature, a direction switching valve for flowing the liquid fuel supplied from the liquefied gas cylinder to the first flow path or the second flow path, and a detection value detected by the temperature detection means The engine working machine according to claim 1, further comprising an operation control unit that controls the operation of the direction switching valve according to the operation. The working machine, the engine working machine according to claim 1 or 2, characterized in that a generator generates an electric power using the power from the engine.

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