JP4126190B2 - Gas engine working machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a configuration of a gas engine working machine such as a portable generator driven by an engine using liquefied gas as fuel.
[0002]
[Prior art]
Conventionally, a generator directly connected to the engine in the main body cover, and an LPG cylinder such as butane and propane, and an emergency and portable engine generator that supplies LPG to the engine cylinder through a pressure regulator and mixer Is commercially available. LPG is low pollution and can adjust the pressure of LPG gas and air with a simple mixer, but the temperature of the fuel gas decreases when it adiabatically expands with the pressure regulator that adjusts the gas pressure. As a result, the supply of fuel gas becomes insufficient, and particularly when the outside air temperature is low, the output of the engine may be reduced.
In order to solve this problem, the gas pipe between the gas cylinder and the pressure regulator is routed around the warm engine cylinder, and the cooling air heated by the cylinder is applied to promote the vaporization of LPG and increase the vapor pressure. Has been devised. In addition, to reduce the temperature due to gas evaporation in the LPG cylinder, the LPG cylinder is installed in the upper part of the engine and the air around the engine is convected to warm the LPG cylinder so that the temperature of the fuel gas is increased. To prevent descent.
[0003]
[Problems to be solved by the invention]
In the conventional portable gas engine, the output reduction of the LPG gas engine has been devised in various ways as described above. However, the working machine (for example, the load increases significantly when the rotation of the engine directly connected to the working machine increases) In the case of lawn mowers, vacuum cleaners, etc.), there is no concern about over-rotation. However, when the generator is turned directly connected to the engine, there is almost no increase in load due to increased rotation, which may cause over-rotation. 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.
[0004]
[Means for Solving the Problems]
In response to the above problems, the present invention
(1) A governor that adjusts the rotational speed range while being driven by a four-cycle engine that regulates the gas from a liquefied gas cassette cylinder housed in the upper part of the main body cover and burns and outputs a mixed gas mixed with air. In the gas engine working machine provided with the lever, the lever fixed to the torque shaft that penetrates the crankcase of the engine, the governor handle and the intermediate lever that are pivotally supported by the speed control panel, and the governor handle A tension spring hung between the long hole and the lever, a link bar for transmitting the rotation of the lever to the intermediate lever, and an operating wire attached to the intermediate lever and connected to the fuel gas flow adjusting needle valve of the air gas mixer When, and a limit switch for stopping the engine is pushed by the governor handle stop position, the hook portion of the tension spring the In the hole, the tension of the tension spring is eliminated at the stop position of the governor handle, and the tension of the tension spring is weakened at the start position to throttle the fuel gas flow rate adjusting needle valve, respectively, and the governor handle operating position Then, the gas engine working machine which controls the rotational speed by opening the fuel gas flow rate adjusting needle valve by applying the tension of the tension spring is used as means for solving the problem.
(2) Further, in the gas engine working machine of the above (1), the gas engine working machine in which the handle of the operation switching lever interlocked with the governor is arranged on the output panel side of the working machine is used as means for solving the problem.
(3) In the gas engine working machine according to (1) or (2), an opening is provided in the upper body cover of the liquefied gas cassette cylinder so that the cassette cylinder can be easily replaced. Thus, a gas engine working machine provided with a lid that can be easily attached and removed is used as a means for solving the problem.
(4) In the gas engine working machine according to any one of the above (1) to (3), a gas engine working machine provided with a manual cock valve for blocking the liquefied gas passage at the upper part of the main body cover is used as means for solving the problem.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of an LPG gas engine direct-coupled generator according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing the overall configuration of an engine driven generator using LPG gas, FIG. 2 is a side view (partial cross-sectional view) showing the arrangement of functional components inside the engine driven generator of FIG. FIG. 4 is an overall perspective view of the engine-driven generator shown in FIG. 1, and FIG. 5 is a perspective view showing a storage arrangement of gas cylinders except for the upper lid of the engine-driven generator shown in FIG. It is.
[0006]
In the schematic diagram of FIG. 1, a four-cycle LPG 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. , And a crankshaft (not shown) that outputs a rotational torque via a piston rod (not shown). The crankshaft drives the generator 5. Reference numeral 4 denotes a recoil starter for starting the engine 1.
The combustion gas supplied from the LPG gas cylinder 11 is sent to the vaporizer 13 to be warmed by opening the cock valve 12, the liquid LPG is vaporized, and the vaporized gas is sent to the pressure regulator 9 to adjust the gas pressure to a specified pressure. To the final air gas mixer 7.
By adopting a gas pressure mixer (for example, a mixer 74 disclosed in Japanese Patent Application Laid-Open No. 10-122056) in which the pressure regulator 9 and the air gas mixer 7 are integrated, the space between the engine and the air cleaner 6 can be compactly gathered. .
[0007]
The air sent to the air gas mixer 7 through the air cleaner 6 is mixed with the LPG gas at an appropriate mixing ratio in the air gas mixer 7 and enters the cylinder 2 of the engine 1 where compression ignition combustion is performed. Then, rotational torque is generated on a crankshaft (not shown), and the generator 5 is driven. The exhaust gas that has burned and finished work is exhausted from the muffler 8.
The vaporizer 13 circulates an LPG pipe made of a metal material having a good thermal conductivity around the cylinder 2 by an appropriate length, promotes the vaporization of LPG by the heat of the cooling air heated by the cylinder 2, Has the function of increasing the pressure.
[0008]
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 the shaft 28 (supported rotatably by the speed control panel 20). Since the end of an operating wire 22 (guided by a wire guide tube 22a) connected to a fuel gas flow rate adjusting needle valve (not shown) of the air gas mixer 7 is attached to the intermediate lever 19, rotation of the lever 15 is performed. Is transmitted to the fuel gas flow rate adjusting needle valve of the air gas mixer 7, and the fuel gas flow rate adjusting needle valve can be taken in and out to adjust the fuel gas flow rate.
[0009]
A tension spring 16 is suspended between the lever 15 and the governor handle 17. The governor handle 17 has a long hole 17a and is rotatable about a shaft 27 (rotatably supported by the governing panel 20), and is pulled at the “stop” position indicated by a broken line. The spring 16 is loose and has no acting force, and the governor handle 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 governor handle 17, the tension spring 16 is in a weak acting force, the thrust force of the thrust mechanism corresponding to the rotational speed of the crankshaft is weak, and the lever 15 has the operating wire 22 in the air. When the flow rate adjusting needle valve of the gas mixer 7 is slid in the direction to throttle the fuel gas, a thin fuel mixed gas is fed into the cylinder 2, and when the handle 10 of the recoil starter 4 is pulled here, the engine 1 starts at a low speed. .
[0010]
When the engine 1 is started and the governor handle 17 is set to the “driving” position indicated by the one-dot chain line, the lever 15 rotates in the direction of arrow F via the tension spring 16 and the link bar 18 and the intermediate lever 19 are interposed. Then, the operation wire 22 is pulled, and the flow adjustment needle valve of the air gas mixer 7 is operated to open, and the rotation of the engine 1 is increased to drive the generator 5. The thrust force of the thrust mechanism 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 opens the flow rate adjusting needle valve of the air gas mixer 7. Pulling in the direction, a rich fuel mixture 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 is pulled in the closing direction, and a gas with a small mixing ratio is supplied to the cylinder 2 and lowered to a rotational speed that balances.
[0011]
As described above, the engine rotational speed governor 14 is provided, and the engine torque is controlled by adjusting the fuel gas mixture ratio of the air gas mixer 7 so that the rotational speed of the engine 1 is substantially constant. The output of 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 to 3 show the arrangement of functional components inside the 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. Show. 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 rectified by an inverter 59 for 50 cycles and 60 cycles. 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 with the upper cover 38 of the engine-driven generator removed.
2 and 3, reference numeral 35 denotes a machine base, 36A denotes a front cover, 36B denotes a rear cover, 37 denotes a cylinder storage base, and 39 denotes a gas supply port for connecting the cylinder 11 and the cock valve 12.
[0012]
【The invention's effect】
The LPG gas engine direct generator of the present invention is provided with an engine speed governor, and the output torque is controlled so that the fuel gas mixing ratio of the air and LPG gas mixer is adjusted so that the engine speed is substantially constant. By doing so, the generator can be driven with a stable output of the engine, over-rotation can be prevented, and the rotation of the generator can be controlled within a certain range regardless of the load.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of an engine driven generator using LPG gas according to an embodiment of the present invention.
2 is a side view (partially cross-sectional view) showing an arrangement of functional components inside the engine-driven generator shown in FIG. 1. FIG.
3 is a plan view showing an AA cross section of FIG. 2; FIG.
4 is an overall perspective view of the engine-driven generator shown in FIG. 1. FIG.
5 is a perspective view showing a storage arrangement of gas cylinders except for an upper lid of the engine-driven generator in FIG. 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... LPG gas engine 2 ... Cylinder 3 ... Crankcase 5 ... Generator 7 ... Air gas mixer 9 ... Pressure regulator 11 ... LPG cylinder 12 ... Cock valve 13 ... Vaporizer 14 ... Engine rotation governor 17 ... Governor handle 25 ... Output panel

Claims (4)

A governor that adjusts the rotational speed range is provided, as well as being driven by a four-cycle engine that regulates the gas from the liquefied gas cassette cylinder housed in the upper part of the main body cover and burns and outputs a mixed gas mixed with air. In a gas engine working machine, a lever fixed to a torque shaft that penetrates the crankcase of the engine, a governor handle and an intermediate lever that are pivotally supported by a speed control panel, and a long hole provided in the governor handle A tension spring hung between the lever and the lever, a link bar that transmits the rotation of the lever to the intermediate lever, an operating wire attached to the intermediate lever and connected to the fuel gas flow adjustment needle valve of the air gas mixer, and a stop pushed by the governor handle position and a limit switch for stopping the engine, the hook portion of the tension spring in the slots At the stop position of the governor handle, the tension of the tension spring is eliminated, and at the start position, the tension of the tension spring is weakened to throttle the fuel gas flow rate adjusting needle valve. A gas engine working machine characterized in that the rotational speed is controlled by opening the fuel gas flow rate adjusting needle valve by applying tension of a tension spring .   2. The gas engine working machine according to claim 1, wherein a handle of an operation switching lever linked to the governor is arranged side by side on the output panel side of the working machine.   In the gas engine working machine according to claim 1 or 2, an opening is provided in the upper body cover of the liquefied gas cassette cylinder so that the cassette cylinder can be easily replaced. A gas engine working machine with a lid that can be attached and removed.   The gas engine working machine according to any one of claims 1 to 3, wherein a manual cock valve for blocking the liquefied gas passage is provided at an upper part of the main body cover.

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