JPH0518322A - Fuel vaporization accelerator for air-cooled engine - Google Patents

Abstract

PURPOSE:To provide an object which can cheaply and smoothly accelerate the vaporization of the fuel gas liquefied and charged, concerning an air-cooled engine. CONSTITUTION:The liquefied gas inside a liquefied gas supply passage 10 can be warmed with the heat of the lubricant passing through a lubricant guide passage 8, and the vaporization accelerated, by passing a lubricant guide path 8, which is led from the lubricant passage 6 of the forced lubrication system 5 of an air-cooled gas engine E, and a liquefied gas supply passage 10 in the casing of the 7 of a vaporizer 4. Accordingly, the electric heating cost by an electric heater can be omitted as in the past, and the vaporization of the fuel liquefied gas can be accelerated cheaply and smoothly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel vaporization promoting device for an air-cooled gas engine, which can inexpensively and smoothly promote vaporization of liquefied and filled fuel gas.

[0002]

2. Description of the Related Art Generally, liquefied gas, for example, LP gas is cheaper than gasoline, so that a demand for a gas engine using this gas as fuel is high. That is, the present invention is directed to this air-cooled gas engine, and its basic structure is, as shown in FIG. 1 or 2, in the intake passage 1 of the air-cooled gas engine E a mixer 2
And a liquefied gas supply source 3 for fuel is connected to the mixer 2 via a vaporizer 4 through a liquefied gas supply path 5, and the liquefied gas from the liquefied gas supply source 3 is vaporized by the vaporizer 4 and sent to the mixer 2. It is of the form

In a conventional gas engine using LP gas as a fuel, since the LP gas is liquefied and filled in a cylinder under pressure, the liquefied gas is vaporized under reduced pressure by a vaporizer incorporating an electric heater and sent to the mixer. .. On the other hand, in order to reduce the electricity cost by the electric heater, a water-cooled gas engine is configured to utilize the water-cooling device of the engine to promote vaporization of the liquefied gas by the heat of the cooling water warmed by cooling the engine. is there.

[0004]

However, in the air-cooled gas engine to which the present invention is applied, hot water cannot be used unlike the water-cooled engine, so vaporization of the LP gas incurs an electric heating cost of the vaporizer. The running cost of the engine is high. An object of the present invention is to promote vaporization of fuel liquefied gas inexpensively and smoothly in an air-cooled gas engine.

[0005]

Means for achieving the above object will be described below with reference to the drawings illustrating an embodiment. That is, according to the present invention, in the air-cooled gas engine of the basic structure, the vaporizer 4 is provided with a lubricating oil guide passage 8 guided from the lubricating oil passage 6 of the forced lubricating device 5 of the air-cooled gas engine E and the liquefied gas supply in the casing 7. It is configured such that heat can be exchanged between the fluid in the passage 10 and the fluid in the passage, and vaporization of the liquefied gas in the liquefied gas supply passage 10 is promoted by the lubricating oil passing through the lubricating oil guide passage 8 of the vaporizer 4. It is a fuel vaporization promoting device for an air-cooled gas engine.

[0006]

Using the forced lubrication device 5 of the air-cooled gas engine E, the lubricating oil guide passage 8 guided from the lubricating oil passage 6 of the forced lubrication device 5 is passed through the vaporizer 4 to exchange heat between the lubricating oil and the liquefied gas. The liquefied gas passing through the liquefied gas supply passage 10 is warmed by the heat of the lubricating oil in the lubricating oil guide passage 8 to promote vaporization.

On the other hand, since the lubricating oil in the lubricating oil guide passage 8 passing through the vaporizer 4 is cooled by the vaporization heat taken by the liquefied gas, deterioration of the lubricating oil can be prevented and the life of the lubricating oil can be extended. Particularly, in engine working machines such as engine generators, the gas engine E is often covered with a soundproof case or the like, and the heat of the engine E does not easily escape to the outside. According to the accelerating device, cooling of the lubricating oil with the liquefied gas can be promoted to smoothly solve this problem.

[0008]

EFFECTS OF THE INVENTION Lubricating oil passing through a lubricating oil passage of a forced lubrication system for an air-cooled gas engine is used, and vaporization of fuel liquefied gas can be promoted by this heat, so that electric heating cost by an electric heater can be omitted as in the conventional case. It is cheap and can promote vaporization of liquefied gas smoothly.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a schematic explanatory view of a fuel vaporization promoting apparatus for an air-cooled gas engine showing a first embodiment, in which a cooling fan (not shown) is supported on a crankshaft 19 of an air-cooled gas engine E, and the cooling fan is installed in a wind guide case 11. The engine E is configured to be air-cooled.

A mixer 2 and an air cleaner 12 are provided in an intake pipe 1 of the air-cooled engine E, and an LP gas supply cylinder 3 is provided.
The fuel filter 13, vaporizer 4 and zero governor 1
4 (that is, a regulator) to communicate with the mixer 2 through the LP gas supply path 10 to vaporize the LP gas that is liquefied and filled in the LP gas cylinder 3 by the vaporizer 4 to mix the LP gas.
To send to. However, as shown in FIG. 1, the vaporizer 4 and the zero governor 14 are integrally configured by a casing 7.

The gas engine E is provided with the forced lubrication device 5, and the stored oil sucked up from the strainer 16 of the oil pan 15 is discharged by the lubrication pump 17 to the oil filter 1.
The lubricating oil passage 6 is pressure-fed to various lubricating parts such as the crankshaft 19 via the shaft 8. The vaporizer 4 includes a lubricating oil guide passage 8 guided from the lubricating oil passage 6 of the forced lubrication device 5 in the casing 7 and the LP gas supply passage 1.
The LP gas in the LP gas supply cylinder 3 passes through the lubricating oil guide passage 8 in the casing 7 of the vaporizer 4, and the lubricating oil and the LP gas are heat-exchangeable. Evaporation is promoted by oil.

To explain the function of the first embodiment, the forced lubricating device 5 of the air-cooled gas engine E is used to vaporize the LP gas by the heat of the lubricating oil passing through the lubricating oil guide passage 8.
Electric heating cost by electric heater can be omitted as in the past.
It is inexpensive and can promote vaporization of LP gas smoothly.

On the other hand, since the lubricating oil in the lubricating oil guide passage 8 is cooled by the heat of vaporization taken by the LP gas, deterioration of the lubricating oil can be prevented and the life of the lubricating oil can be extended.

In the first embodiment, instead of branching the lubricating oil passage 6 from the lubricating oil passage 6 in parallel as shown in FIG. 1, the lubricating oil passage 6 is directly branched without branching. It is possible to bypass the vaporizer 4 as 8 (that is, to connect the lubricating oil passage 6 on the engine body side and the lubricating oil guide passage 8 in series). In addition, zero governor 14
The vaporizer 4 and the vaporizer 4 may be formed separately.

FIG. 2 shows a second embodiment of the present invention in which the vaporization of LP gas is promoted by the heat of exhaust gas.
That is, the muffler 21 is provided in the exhaust pipe 20 of the gas engine E, and the exhaust gas guide passage 22 led out from the exhaust pipe 20 and the LP gas supply passage 10 are passed through the casing 7 of the vaporizer 4 in a heat-exchangeable manner so that the LP gas supply cylinder The LP gas liquefied and filled in 3 is warmed by the exhaust gas from the exhaust guide passage 22 to promote vaporization. However, the return side outlet 22 a of the exhaust guide passage 22 is connected to the outlet pipe 23 of the muffler 21.

In the second embodiment, by using the exhaust gas, the electric heating cost can be omitted as in the first embodiment. Further, since the exhaust gas in the exhaust guide passage 22 is cooled by the heat of vaporization taken by the LP gas, a temperature difference occurs in the exhaust gas at the outlet pipe 23 of the muffler 21, and the noise of the muffler 21 can be reduced.

As shown by the phantom line in FIG. 2, the exhaust gas guide passage 22 is connected to the intake pipe 1 via the on-off valve 25 which can be electronically controlled by the EGR exhaust gas introduction passage 24, and is cooled by the vaporizer 4. EGR exhaust gas introduction passage 2 with the exhaust gas as an inert gas
It may be configured such that NOx or the like is reduced by introducing the fuel into the intake pipe 1 from 4 to lower the combustion temperature.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of a fuel vaporization promoting device for an air-cooled gas engine showing a first embodiment.

FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake passage 2 Mixer 3 Liquefied gas supply source for fuel 4 Vaporizer 5 Forced lubrication device 6 Lubricating oil passage of 5 7 Casing 8 Lubricating oil guide passage 10 Liquefied gas supply passage E Air-cooled gas engine

Claims (1)

Claims: 1. A mixer (2) is provided in an intake passage (1) of an air-cooled gas engine (E), and a liquefied gas supply source (3) for fuel is provided in a vaporizer (4) in the mixer (2). Liquefied gas supply path (1
0), the liquefied gas from the liquefied gas supply source (3) is vaporized by the vaporizer (4) and sent to the mixer (2), wherein the vaporizer (4) is a casing (7). ), The lubricating oil guide passage (8) guided from the lubricating oil passage (6) of the forced lubrication device (5) of the air-cooled gas engine (E) and the liquefied gas supply passage (10) exchange heat between the fluids in the passage. Vaporizer configured through possible
A fuel vaporization promoting device for an air-cooled gas engine, characterized in that the liquefied gas in the liquefied gas supply passage (10) is vaporized by the lubricating oil passing through the lubricating oil guide passage (8).