JPH0625653Y2 - Internal combustion engine device - Google Patents

Description

The present invention relates to an internal combustion engine device that uses liquefied gas such as LPG as a fuel.

2. Description of the Related Art Generally, a small air-cooled two-cycle type internal combustion engine device using LPG or the like as a fuel is detachably attached to a gas cylinder storing liquefied gas, and the liquefied gas in the gas cylinder is vaporized to the internal combustion engine. It is designed to operate as an internal combustion engine by guiding it as fuel, but when the outside air temperature is low,
During high-power continuous operation, the latent heat of vaporization of the fuel liquid is large, so it becomes difficult to supply vaporized gas with an appropriate pressure and vaporization amount from the gas cylinder to the internal combustion engine, causing malfunction of the internal combustion engine. There was a fear.

Therefore, the inventors of the present invention previously arranged a heat transfer member made of metal having good thermal conductivity between the high temperature part of the internal combustion engine and the gas cylinder so as to transfer the heat from the high temperature part of the internal combustion engine to this heat transfer part. We proposed a device that heats a gas cylinder by transmitting it to a gas cylinder through a member.

The present invention utilizes a fluid as a heat transfer medium to transfer the heat of a high temperature part of an internal combustion engine to a gas cylinder to further enhance the heat transfer efficiency and to improve the positional relationship between the internal combustion engine and the gas cylinder. It is an object of the present invention to provide an internal combustion engine device that is not restricted and has a high degree of freedom in structural design.

Means for Solving the Problems That is, according to the present invention, an internal combustion engine device having an internal combustion engine that uses liquefied gas stored in a gas cylinder as a fuel is a pedestal that directly contacts the high temperature part of the internal combustion engine and the gas cylinder. It is characterized in that it is directly connected to the heat transfer material forming the by a pipe through which a fluid heat transfer medium flows.

Action Therefore, the liquefied gas fuel in the gas cylinder is effectively heated by the heat carried by the fluid heat transfer medium.

Embodiment First, the embodiment shown in FIG. 1 is an internal combustion engine device P as a drive source for a brush cutter, and one end of a tail pipe 4 is provided at an exhaust outlet 3 of a silencer 2 which is a high temperature portion of the internal combustion engine 1. The portion 5 is connected to the tail pipe 4 in an airtight state by a nipple or the like.
A heat transfer plate 8 which is a heat transfer material made of copper plate or the like is welded to the other end 6 of the gas cylinder 7 as a pedestal for mounting the gas cylinder 7. The high-temperature exhaust gas discharged to the exhaust gas outlet portion 3 through the silencer 2 during the operation of the internal combustion engine 1 is introduced into the tail pipe 4 and further flows through the tail pipe 4 to the other end portion 6. , Through the exhaust outlet 9 in the direction opposite to the worker. At this time, the heat of the exhaust gas flowing through the tail pipe 4 is transferred to the heat transfer plate 8, and the transferred heat appropriately heats the liquefied gas fuel in the gas cylinder 7 to promote vaporization of the fuel in the gas cylinder 7. As described above, in the embodiment shown in FIG. 1, the exhaust gas, which is the high-temperature fluid from the silencer 2, can be directly and efficiently used as the heat transfer medium, and the heating amount is proportional to the engine load during the engine operation. Yes, tail pipe 4
Is relatively easy to deform, it is possible to design the position of the gas cylinder 7 relative to the internal combustion engine 1 relatively freely, and since the tail pipe 4 is relatively long, it can be used as an additional exhaust chamber volume, and the engine power It is also possible to improve.

In FIG. 1, 17 is a handle, 18 is a receiving hole for inserting an operating rod (not shown), and 20 is a centrifugal clutch 19.
Is the output axis of.

Next, in the apparatus of another embodiment of the present invention shown in FIGS. 2 and 3, the heat absorbing portion 11 at one end of the heat pipe 10 is formed by caulking a flange 12 made of a metal material such as aluminum. The heat radiating portion 13 at the other end of the heat pipe 10 is longitudinally extended to the bottom portion 15 of the heat transfer plate 14 made of a metal material such as aluminum, and fixed to the bottom portion 15 by caulking or the like. It is configured. The heat pipe 10 is of a generally known type, that is, a wicking material made of glass fiber or net-like thin copper wire is attached to the inside of a tube of aluminum, stainless steel, copper or the like to reduce the pressure inside. However, heat transfer is performed by transfer of vapor of a heat transfer medium of fluid such as freon, ammonia, water and transfer of latent heat of vaporization. The flange 12 is fixed to a high temperature part such as a case, a cylinder, a silencer of an internal combustion engine by screwing or the like to receive heat. On the heat transfer plate 14, a gas cylinder 16 is placed horizontally. The heat pipe 10 transfers the heat received by the heat absorbing portion 11 from the heat transfer plate 14 of the heat radiating portion 13 to the gas cylinder 16 by means of the heat transfer fluid therein, and heats the liquefied gas fuel in the gas cylinder 16 to an appropriate degree. The vaporization of the fuel in the gas cylinder 16 is promoted. As described above, in this embodiment, the use of the heat pipe has advantages such as quick response and high safety.

Effect of the Invention With the configuration of the present invention described above, the present invention directly connects the pedestal formed by the heat transfer material in direct contact with the gas cylinder and the high temperature part of the internal combustion engine with the flow pipe of the fluid heat transfer medium. The heat of the high temperature part of the internal combustion engine is transferred to the gas cylinder by connecting to
The gas cylinder can be effectively and economically heated to properly maintain the operation of the internal combustion engine, and can be heated with the amount of heat proportional to the engine load even during engine operation. The heating structure and the structure of the pedestal and the distribution pipe Together with this, the heat quantity between the high temperature part and the gas cylinder can be easily adjusted by selecting the size and material of the heat transfer plate, and the degree of freedom in the structural design can be increased to ensure the proper arrangement of the gas cylinder. It is expected that the structure is simple and small, and the pollution due to exhaust gas is prevented.

[Brief description of drawings]

FIG. 1 is a side view of a main part of an internal combustion engine device showing an embodiment of the present invention in cross section, FIG. 2 is a side view of the main part of an internal combustion engine device showing another embodiment of the present invention, and FIG. 3 is the second
It is a principal part end view of the apparatus of the figure. 1 ... Internal combustion engine, 2 ... Silencer, 4 ... Tail pipe,
7, 16 ... Gas cylinder, 8,14 ... Heat transfer plate, 10 ...
…heat pipe.

Claims (3)

[Scope of utility model registration request] 1. An internal combustion engine device (P) having an internal combustion engine (1) which uses liquefied gas stored in a gas cylinder (7, 16) as fuel, in a high temperature part (2) of the internal combustion engine and the gas cylinder. Heat transfer material (8, 1) that forms a pedestal that directly contacts
4) Pipes (4, 10) through which a fluid heat transfer medium flows
An internal combustion engine device characterized by being directly connected by. 2. The internal combustion engine device according to claim 1, wherein the fluid heat transfer medium is exhaust gas of the internal combustion engine. 3. The internal combustion engine device according to claim 1, wherein the pipe through which the fluid heat transfer medium flows is a heat pipe.