JPH0447408Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an internal combustion engine device that uses liquefied gas such as LPG as fuel.

BACKGROUND TECHNOLOGY In general, internal combustion engine devices that use LPG as fuel, etc.
A gas cylinder storing liquefied gas is removably attached to an internal combustion engine device, and the liquefied gas in the gas cylinder is guided to the internal combustion engine as vaporized gas fuel to operate the internal combustion engine, but when the outside temperature is low, Since the latent heat of the fuel liquid is large, it is difficult to supply vaporized gas with appropriate pressure and vaporization amount from the gas cylinder to the internal combustion engine, which may cause malfunction of the internal combustion engine.

Problems to be Solved by the Invention Therefore, an object of the present invention is to solve the problems of the conventional technology, and to provide an internal combustion engine device that is simple in structure and convenient to use.

Means for Solving the Problems That is, according to the present invention, in an internal combustion engine apparatus having an internal combustion engine that uses liquefied gas stored in a gas cylinder as fuel, a heat transfer member that is brought into contact with a high temperature part of the internal combustion engine is provided. and a relative position changing means for holding the heat transfer member in a variable contact position with respect to the gas cylinder.

Effect: Therefore, by arranging the heat transfer member at a heat transfer position in contact with the gas cylinder, heat from the high temperature part of the internal combustion engine can be transferred to the gas cylinder to heat the gas cylinder, and the gas cylinder can also be heated. When it is not necessary, the heat transfer to the gas cylinder can be controlled by adjusting the heat transfer member such as by arranging it at a position separated from the heat insulating member.

Embodiments Next, the present invention will be described based on embodiments shown in the drawings.

The illustrated embodiment is an example in which the present invention is applied to a small air-cooled two-stroke internal combustion engine device used in a portable working machine. Engine 2
has a cylinder 4 in which a piston 3 is disposed so as to be able to reciprocate, and a crankcase 5 connected to one end of the cylinder 4, and the crankcase 5 rotatably supports a crankshaft 6. The crankshaft 6 is connected to the piston 3 by a connecting rod 7. A fuel mixer 8 is arranged above the cylinder 4, and the mixer 8 supplies a mixture of fuel, lubricating oil and air to the cylinder 4. Also,
An exhaust gas muffler 9 is provided below the cylinder 4, and the exhaust gas muffler 9 receives the exhaust gas of the fuel burned in the cylinder 4, and discharges the exhaust gas to the outside from the exhaust gas outlet 10 while muffling the exhaust gas. Becomes a high temperature section.

Further, a gas cylinder 11 is provided in the main body case 1 adjacent to the crankcase 5 of the internal combustion engine 2.
is placed. The gas cylinder 11 contains LPG as a liquefied gas fuel for driving the internal combustion engine 2.
The gas outlet 1 is inserted into the main body case 1 through an opening 12 formed at the lower end of the main body case 1, and is provided at the upper end 13 of the main body case 1.
4 is engaged with the gas supply section 15 provided at the upper end of the main body case 1 to open the opening 12, and the opening 12 is closed with a removable lid 16, and the bottom 17 of the gas cylinder 11 is supported by the lid 16. . The gas supply unit 15 is connected to the mixer 8 and supplies vaporized gas in the gas cylinder 11 to the mixer 8 as fuel.

The gas cylinder 11 is attached to the exhaust gas muffler 9.
One end of the stationary side heat transfer member 18 extending toward is fixed by welding or the like. The fixed side heat transfer member 18
The movable heat transfer member 19 is held at the outer end side of the movable heat transfer member 19 by bolts 20 and nuts 21 passing through the movable heat transfer member 19 so as to be variable in length and supported in contact with each other. The movable side heat transfer member 19 is the fixed side heat transfer member 18
It further extends toward the gas cylinder 11, and a semicircular heat insulating member 22 is attached to its tip 23 by welding or the like. The heat retaining member 22 is disposed so as to surround half the circumference of the gas cylinder 11 near the bottom 17, and the inner diameter of the semicircle of the heat retaining member 22 has approximately the same dimension as the outer diameter of the gas cylinder 11. Further, the fixed side heat transfer member 18, the movable side heat transfer member 19, and the heat insulating member 22 are made of a metal material with high thermal conductivity such as aluminum. The bolt 20 is attached to the movable heat transfer member 19
The movable heat transfer member 19 is loosely fitted into a slot (not shown) that is long in the longitudinal direction, that is, in the left and right direction when looking at the drawing, and is loosely fitted into a slot (not shown) formed in the longitudinal direction, that is, in the left and right direction when looking at the drawing. can be moved in the longitudinal direction relative to the In this way, the movable side heat transfer member 19 is transferred to the heat retaining member 2 as shown in the figure.
A heat transfer position where the heat insulating member 22 is kept in contact with the outer peripheral surface of the gas cylinder 11, and an adiabatic position where the heat insulating member 22 is moved to the right from the illustrated heat transfer position and held at a sufficient distance from the outer peripheral part of the gas cylinder 11. It can be placed at an appropriate position between the two.

When this internal combustion engine device is operated in an environment where the outside air temperature is low, the movable heat transfer member 19 is placed at a heat transfer position. Therefore, the heat of the exhaust gas muffler 9 heated by the exhaust gas discharged from the internal combustion engine 2 is transmitted through the fixed heat transfer member 18, the movable heat transfer member 19, and the heat insulating member 22 to the bottom 17 of the gas cylinder 11. transmitted to nearby surrounding areas. gas cylinder 1
The liquid part of LPG in 1 is gas cylinder 11
Since the exhaust gas muffler 9 is located at the bottom 17 of the gas cylinder 11, the heat from the exhaust gas muffler 9 directly heats the liquid part of the LPG through the peripheral part of the gas cylinder 11, thereby delivering the gaseous fuel at the right pressure and the right amount of vaporization to the mixer. 8 and further to the internal combustion engine 2.

When the outside air temperature is relatively high and there is no need to heat the gas cylinder 11, the movable heat transfer member 19 is moved to the adiabatic position to block heat transfer from the exhaust gas muffler 9 to the gas cylinder 11, thereby preventing excessive gas pressure. Accidents such as a sudden rise and explosion of the fuel supply system including the gas cylinder 11 can be prevented.

In addition, in this embodiment, the bolt 20 and the nut 21
Although the relative position changing means described above is used, any appropriate means such as using a bimetal for the heat transfer member may be used.

Effects of the invention With the structure of the invention explained above, the invention has the following effects:
When the outside temperature is low, the gas cylinder can be effectively and economically heated by using the heat from the high-temperature parts such as the exhaust gas muffler of the internal combustion engine to maintain proper operation of the internal combustion engine, and there is no need to heat the gas cylinder. At times, the contact state of the heat transfer member can be appropriately adjusted to prevent accidents caused by heating of the gas cylinder, and it is possible to provide an internal combustion engine device with a simple structure and convenient use.

[Brief explanation of drawings]

FIG. 1 is a cutaway side view showing an embodiment of an internal combustion engine device according to the present invention. 2... Internal combustion engine, 9... Exhaust gas muffler (high temperature part), 11... Gas cylinder, 18... Fixed side heat transfer member, 19... Movable side heat transfer member, 20, 21...
Relative position changing means.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine device having an internal combustion engine 2 that uses liquefied gas stored in a gas cylinder 11 as fuel, heat transfer members 18 and 19 are brought into contact with a high temperature section 9 of the internal combustion engine, and the heat transfer members are connected to the gas cylinder. 1. An internal combustion engine apparatus comprising: relative position changing means 20, 21 for holding the contact position variably with respect to the internal combustion engine apparatus.