JP2006207552A - Gas engine working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas engine working machine driven by a 4-cycle gas engine which can use butane gas and propane gas having different vapor pressure characteristics. <P>SOLUTION: The gas engine working machine is covered by a main body cover, and is driven by the 4-cycle engine for performing compression ignition combustion using a mixed gas of liquefied petroleum gas of butane or propane and air, and outputting it. The gas engine working machine is equipped with a gas cartridge storage room provided partitioned on the upper part inside the main body cover, a vaporizer for heating butane liquefied gas with heat from the cylinder, a fuel gas pressure regulator, an air-gas mixing device, a fuel cock for switching between opening and closing of a supply gas passage, and a governor for adjusting a rotation speed range. The butane liquefied gas cylinder is set into the gas cylinder storage room, or a supply pipe such as a separate propane gas liquefied cylinder can be connected to the fuel cock, and the fuel cock can be used to switch between butane gas and propane gas. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gas engine working machine such as a portable engine generator driven by a liquefied gas cassette cylinder housed in a main body or a four-cycle gas engine using LPG stored in a separate liquefied gas cylinder as fuel. .

  Conventionally, a generator that is directly connected to the engine in the main body cover, and an emergency and portable engine power generator that supplies LPG such as butane and propane liquefied and stored in a cylinder to the engine cylinder through a gas pressure regulator and a mixer. The machine is commercially available. LPG is low pollution, and the pressure-regulated LPG and air can be mixed with a simple mixer, but when the fuel vaporizes in the butane liquefied gas cassette cylinder, the temperature of the fuel gas decreases, the pressure decreases, When the supply of fuel gas becomes insufficient, especially when the outside air temperature is low, the output of the engine may be reduced.

  In order to solve this problem, in Patent Document 1 (Japanese Patent Laid-Open No. 2003-314372) and Patent Document 2 (Japanese Patent Laid-Open No. 2003-314373), the gas piping between the butane liquefied gas cassette cylinder and the gas pressure regulator is warm. Around the engine cylinder, the cooling air heated by the cylinder is applied and the temperature of the LPG cassette cylinder is reduced due to gas evaporation. The cassette cylinder is installed at the top of the engine to convect the air around the engine. By doing so, the temperature of the fuel gas is raised by heating the cassette cylinder so as to prevent the gas pressure from dropping.

In conventional portable gas engines, various measures have been devised to prevent the output of the LPG engine from lowering as described above. However, a working machine (for example, lawn mower) whose load increases significantly when the rotation of the engine directly connected to the working machine increases. In the case of a machine, a vacuum cleaner, etc.), there is no concern about overspeeding, but when the generator is turned directly connected to the engine, there is almost no increase in load due to increased rotation, and there is a risk of overspeeding. In this case, a throttle valve may be provided in the gas / air mixer of the engine to limit the flow rate of the fuel gas to prevent over-rotation. It is desirable to limit the rotation to a certain range and control the output torque by the fuel gas mixture ratio.
JP 2003-314372 A JP 2003-314373 A

    As a 4-cycle gas engine using LPG as a fuel, a type using a cassette cylinder such as butane gas is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2003-314372), and a type using a separate propane gas cylinder is disclosed in Patent Document 2 (special JP 2003-314373 A). However, the vapor pressure characteristics of butane gas and propane gas (boiling point is -0.5 ° C for butane gas and -40 ° C for propane gas) are different. Not appearing.

The present invention solves the above problems by the following means.
(1) In a gas engine working machine that is covered by a main body cover and driven by a four-cycle engine that outputs a mixed gas of butane or propane liquefied petroleum gas and air by compression ignition combustion, it is divided into the upper part of the main body cover. Gas cassette cylinder storage chamber, vaporizer that heats butane liquefied gas with cylinder heat, fuel gas pressure regulator, air gas mixer, fuel cock that opens and closes supply gas passage, and rotation speed range A butane liquefied gas cassette cylinder is set in the gas cassette cylinder storage chamber, or a supply pipe for a separate propane liquefied gas cylinder or the like is connected to the fuel cock, and the butane gas and propane gas are connected to the fuel cock. Engine working machine that can be selected and switched.

(2) In the gas engine working machine described in (1) above, a fuel cock is installed on the upper part of the main body cover, a port for introducing butane liquefied gas in the gas cassette cylinder storage chamber as an inlet, and an external propane liquefied gas A gas engine working machine having a port for introduction and a port for connecting a pipe leading to a fuel gas pressure regulator via a vaporizer as an outlet.

(3) In the gas engine working machine described in (1) or (2) above, one of the pipes connecting the fuel cock and the fuel gas pressure regulator has a vaporizer that warms butane liquefied gas with the heat of the cylinder, and the other is A gas engine working machine that has two paths without a vaporizer, and merges immediately before the fuel gas pressure regulator and is coupled to the fuel gas pressure regulator.

(4) In the gas engine working machine described in any of (1) to (3) above, a fuel supply pipe such as a separately installed propane liquefied gas cylinder and a fuel cock on the gas engine working machine side are coupled by a one-touch coupling. Gas engine working machine that can be separated.

(5) The gas engine work machine as set forth in any one of (1) to (4), wherein a handle of an operation switching lever linked to a governor is arranged side by side on an output panel side of the work machine.

  The four-cycle gas engine working machine of the present invention, which uses both a butane gas containing a cassette cylinder and a propane gas containing a separate cylinder, is a butane gas from a butane gas cassette cylinder set in the cassette cylinder storage chamber of the main body cover or a separate propane gas cylinder. The propane gas from can be switched and shut off at the fuel cock. Also, an engine speed governor is provided, and the output torque is controlled so that the mixing ratio of air and fuel gas is adjusted so that the engine speed is substantially constant. While driving a working machine such as a generator, over-rotation can be prevented and the rotation of the working machine can be controlled within a certain range regardless of the load.

An embodiment of a four-cycle gas engine generator will be described with reference to the drawings as a gas engine working machine that uses both a butane gas containing a cassette cylinder and a propane gas containing a separate cylinder.
FIG. 1 is a schematic diagram showing the overall configuration of a gas engine generator combined with butane gas and propane gas, FIG. 2 is a side view (partial cross-sectional view) showing a functional component arrangement inside the gas engine generator of FIG. 1, and FIG. 2 is a plan view showing the AA cross section of FIG. 2, FIG. 4 is an overall perspective view of the gas engine generator of FIG. 1, and FIG. 5 is a perspective view showing the storage arrangement of the gas cylinders except for the upper lid of the gas engine generator of FIG. 6 is a perspective view showing the one-touch coupling receptacle arrangement of the fuel supply pipe on the upper part of the gas engine generator of FIG. 1, FIG. 7 is a top view of the fuel cock, and FIG. 8 is a sectional view showing the gas passage of the fuel cock. It is.

In the schematic diagram of FIG. 1, a four-cycle gas engine 1 includes a cylinder 2 including a cylinder head, a crankcase 3, a piston (not shown) that reciprocates in the cylinder 2, and a combustion gas pressure that the piston receives. A crankshaft (not shown) that outputs in place of a rotational torque via a piston rod (not shown), and the crankshaft drives the generator 5 directly. Reference numeral 4 denotes a recoil starter for starting the engine 1.
The LPG used in the four-cycle gas engine 1 can be used as a fuel mainly composed of liquefied butane in a cassette cylinder and liquefied propane in a separate cylinder. Therefore, a manual cock type fuel cock 12 is provided on the upper part of the main body cover 36 of the four-cycle gas engine 1 so that butane gas and propane gas can be switched.

  Propane gas supplied from the propane gas cylinder 31 is easily supplied to the coupling 33a shown in FIG. 6 on the receiving side provided in the fuel cock 12 by the one-touch coupling 33b shown in FIG. It can be combined and separated. As shown in FIG. 5, two cassette cylinders 11 are housed in parallel in the upper part of the main body cover 36, and as shown in FIG. 5, the nozzles of the cassette cylinder 11 are inserted into the two intake ports 39, not shown. The gas supply valve is opened and attached by a spring receiver 43 fixed to a cylinder mount 37 provided on the main body cover 36, a compression spring 42, and a cylinder presser 41 rotatably supported on the cylinder mount 37. is there. Instead of the cylinder holder 41, the compression spring 42, and the spring receiver 43, a rib 38 a may be provided on the upper lid 38 to press the cassette cylinder 11.

The butane fuel from the cassette cylinder 11 is sent to the vaporizer 13 by switching the fuel cock 12 and warmed, and the vaporized gas is sent to a fuel gas pressure regulator 9 (hereinafter referred to as a regulator). Further, since the vaporization temperature of propane fuel is low, the gas vaporized inside the propane cylinder 31 is taken out. However, since the pressure is reduced to about 2 kg / cm ² at the outlet of the propane cylinder 31, it is not necessary to pass the vaporizer 13. The propane gas selected and switched by the fuel cock 12 is sent directly to the regulator 9 through the supply pipe 45 without passing through the vaporizer 13. In the regulator 9, the gas pressure is adjusted to a specified pressure and sent to the final air gas mixer 7.

As shown in the top view of the fuel cock 12 in FIG. 7, the knob 12a of the fuel cock 12 can be turned to select closing (gas supply cutoff), butane gas, or propane gas. 8 shows a ball-shaped rotating portion 12b integrated with the knob 12a of the fuel cock 12 and a cross-section of a fixed valve body 12c fitted on the rotating portion 12b, so that the gas passage and the switching direction at the position of the knob 12a in FIG. Indicates a passage position when butane gas is supplied. When the knob 12a is rotated 90 degrees clockwise from the position shown in FIG. 7, the gas is closed (blocked), and when it is further rotated 90 degrees clockwise, the passage position for supplying propane gas is reached.

  The air sent to the air gas mixer 7 through the air cleaner 6 is mixed with the butane gas or propane gas so as to have an appropriate mixing ratio in the air gas mixer 7 and enters the cylinder 2 of the engine 1 where compression ignition is performed. Combustion generates rotational torque on a crankshaft (not shown) to drive the generator 5. The exhaust gas that has burned and finished work is exhausted from the muffler 8. The vaporizer 13 circulates a gas pipe made of a metal material made of a metal material having good heat conduction around the cylinder 2 for an appropriate length, promotes vaporization of butane by the heat of the cooling air heated by the cylinder 2, and gas pressure It has a function to raise. The bracket 2 made of a metal material with good heat conduction welded to the pipes constituting the vaporizer 13 is fastened together with the muffler 8 to the exhaust port of the cylinder 2 or with the cylinder head cover. It may be conducted directly.

  Next, the configuration and operation of the governor 14 will be described. The crankcase 3 of the engine 1 has a built-in thrust mechanism that generates thrust in the direction of the crankshaft by centrifugal force proportional to the square of the rotation speed of the crankshaft, and via a torque shaft 23 that penetrates the crankcase 3. Thus, the thrust force of the thrust mechanism is taken out of the crankcase 3 and the lever 15 fixed to the torque shaft 23 is pulled in the direction opposite to the arrow F. The rotation of the lever 15 is transmitted to the intermediate lever 19 by the link bar 18, and the intermediate lever 19 rotates in conjunction with the lever 15 around a shaft 28 fixed to the support plate 21. The support plate 21 is fixed to the crankcase 3 of the engine 1.

Since the end of the operating wire 22 connected to the fuel gas flow rate adjusting needle valve of the air gas mixer 7 is attached to the intermediate lever 19, the rotation of the lever 15 is transmitted to the fuel gas flow rate adjusting needle valve of the air gas mixer 7. The fuel gas flow rate can be adjusted by taking in and out the fuel gas flow rate adjusting needle valve. In addition, a cylindrical weir capable of adjusting the air intake area is attached to the end of the working wire 22, and the air flow rate corresponding to the fuel gas flow rate is adjusted at the same time, so that the optimum air / fuel gas mixing ratio is achieved. Can be obtained. Reference numeral 22a denotes a flexible protective tube for the working wire 22 whose both ends are fixed to the support plate 21 and the air gas mixer 7, respectively.

  A tension spring 16 is hung between the lever 15 and the operation switching lever 17. The operation switching lever 17 is provided with a long hole 17a and is rotatable about a shaft 27 fixed to the support plate 21. At the “stop” position indicated by a broken line, the tension spring 16 is loosened and the acting force is exerted. The operation switching lever 17 pushes the limit switch 29 to short-circuit the primary coil of the spark plug to stop the engine 1. At the “start” position indicated by the solid line of the operation switching lever 17, the limit switch 29 is separated from the short circuit of the primary coil, the secondary coil ignition voltage can be generated, and the tension spring 16 is in a state where the acting force is weak. The thrust force of the thrust mechanism corresponding to the rotational speed of the crankshaft is weak, and the lever 15 slides in the direction in which the operating wire 22 squeezes the fuel gas through the flow rate adjusting needle valve of the air gas mixer 7, where the recoil starter 4 By pulling the handle, an appropriate amount of fuel mixed gas is fed into the cylinder 2 and the engine 1 is started at a low speed.

  When the engine 1 is started and the operation switching lever 17 is set to the “operation” position indicated by the one-dot chain line, the lever 15 rotates in the direction of the arrow F via the tension spring 16, and the link bar 18 and the intermediate lever 19. Then, the operation wire 22 is pulled through, and the flow adjustment needle valve and the air intake area of the air gas mixer 7 are operated to open, and the rotation of the engine 1 is increased to drive the generator 5. The thrust force of the thrust mechanism of the crankshaft corresponding to the steady rotation of the engine 1 is transmitted from the torque shaft 23 to the lever 15 and continues to rotate at the rotational speed when balanced with the acting force of the tension spring 16 applied to the lever 15. . If the load of the generator 5 increases and the rotation of the engine 1 decreases, the thrust force of the thrust mechanism decreases, the action force of the tension spring 16 wins, and the operating wire 22 becomes air flow adjusting needle valve of the air gas mixer 7 and the air By pulling in the direction of opening the intake area, the rich fuel mixed gas is supplied to the cylinder 2 and rises to a balanced rotational speed. Further, if the load on the generator 5 is reduced and the rotation of the engine 1 is increased, the thrust force of the thrust mechanism is increased and exceeds the acting force of the tension spring 16, so that the operating wire 22 becomes the flow rate adjusting needle of the air gas mixer 7. The valve and the air intake area are pulled in the direction of closing, and a gas with a thin mixing ratio is supplied to the cylinder 2, and it is lowered to a rotational speed at which a thrust force of a thrust mechanism that balances with the acting force of the tension spring 16 is generated.

As described above, the governor 14 corresponding to the engine rotation speed is provided, and the output torque is controlled by adjusting the fuel gas mixture ratio of the air gas mixer 7 so that the rotation speed of the engine 1 is substantially constant. Thus, the output of the engine 1 can be stably taken out, over-rotation can be prevented, and the rotation of the generator 5 can be controlled within a certain range regardless of the load. 2 and 3 show the arrangement of functional components inside the gas engine-driven generator. FIG. 4 is a perspective view showing the positional relationship between the governor 14 and the output panel 25 having a DC extraction terminal, an AC extraction socket, and the like. Is shown. A part of the current generated in the generator 5 is rectified to a direct current and then connected to a battery charging terminal provided in the output panel 25. Most of the generated current is 50 cycles and 60 cycles in the inverter 49 after rectification. It converts into alternating current and is connected to each socket with which the output panel 25 was equipped. FIG. 5 is a perspective view showing the storage arrangement of the gas cylinder 11 excluding the upper lid 38 of the gas engine driven generator, and FIG. 6 shows the one-touch coupling 33b of the fuel supply pipe on the upper side of the gas engine driven generator. The arrangement of the coupling 33a, which is a receiving port, is shown in a perspective view.
2 and 3, 35 is a machine base, 36A is a front cover, 36B is a rear cover, 37 is a cylinder mounting base, 38 is an upper lid detachably provided on the main body cover 36, 39 is a cylinder 11 and a fuel cock 12. Indicates the intake port connecting the. It is also possible to use it with the top lid 38 removed.
It should be noted that by employing an external butane gas cylinder instead of the external propane gas cylinder 31, it is possible to selectively use the butane gas cylinder on the engine body side and the external butane gas cylinder.

It is a schematic diagram which shows the whole structure of the gas engine generator combined with butane gas and propane gas which concerns on embodiment of this invention. FIG. 2 is a side view (partially cross-sectional view) showing a component arrangement inside the gas engine-driven generator of FIG. 1. It is a top view which shows the AA cross section of FIG. It is a whole perspective view of the gas engine generator of FIG. It is a perspective view which shows the accommodation arrangement | positioning of a gas cylinder except the upper cover of the gas engine generator of FIG. It is a perspective view which shows the one-touch coupling receptacle arrangement | positioning of the fuel supply piping of the upper part of the gas engine generator of FIG. It is a top view of a fuel cock. It is sectional drawing which shows the gas channel | path of a fuel cock.

Explanation of symbols

1 4 cycle gas engine 2 cylinder 3 crankcase 5 generator 7 air gas mixer
9 Fuel gas pressure regulator 11 Cassette cylinder 12 Fuel cock 13 Vaporizer 14 Governor 17 Operation switching lever 25 Output panel 31 Propane gas cylinder 33b One-touch coupling

Claims (5)

  A gas engine working machine that is covered by a main body cover and driven by a four-cycle engine that outputs a mixed gas of liquefied petroleum gas of butane or propane and air by compression ignition combustion is provided separately in the upper part of the main body cover. Gas cassette cylinder storage chamber, vaporizer that warms butane liquefied gas with cylinder heat, fuel gas pressure regulator, air gas mixer, fuel cock that opens and closes supply gas passage, and adjustment of rotation speed range With a governor, set a butane liquefied gas cassette cylinder in the gas cassette cylinder storage chamber, or connect a separate supply pipe for a propane liquefied gas cylinder, etc. to the fuel cock, and selectively switch between butane gas and propane gas in the fuel cock Gas engine working machine characterized by being able to. The gas engine working machine according to claim 1, wherein a fuel cock is installed on the upper part of the main body cover, and a port for introducing butane liquefied gas in the gas cassette cylinder storage chamber as an inlet, and a port for introducing external propane liquefied gas And a port for connecting a pipe leading to the fuel gas pressure regulator via the vaporizer as an outlet.   3. The gas engine working machine according to claim 1, wherein one of the pipes connecting the fuel cock and the fuel gas pressure regulator has a vaporizer that warms butane liquefied gas with the heat of the cylinder, and the other has no vaporizer. A gas engine working machine characterized in that the gas engine working machine joins immediately before the fuel gas pressure regulator and is coupled to the fuel gas pressure regulator.   The gas engine working machine according to any one of claims 1 to 3, wherein a fuel supply pipe such as a separately installed propane liquefied gas cylinder and a fuel cock on the gas engine working machine side can be coupled and separated by one-touch coupling. Gas engine working machine.   The gas engine work machine according to any one of claims 1 to 4, wherein a handle of an operation switching lever linked to a governor is arranged side by side on an output panel side of the work machine.

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