JP2552775B2 - Engine fuel vaporizer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine fuel vaporization and mixing apparatus which vaporizes liquefied gas fuel and mixes it with air to supply it mainly to a small portable engine.

[0002]

2. Description of the Related Art Conventionally, in a fuel vaporization and mixing apparatus of this type of engine, a liquid, a gas, or a liquefied fuel in which a liquid and a gas are mixed is jetted from a fuel container, and the jetted liquefied fuel is discharged. It was mixed with air and supplied to the engine. The conventional fuel vaporization and mixing device has the following drawbacks. That is, when the main component of the liquefied gas fuel is butane, the vaporizable temperature of the liquefied butane fuel cannot be vaporized at 0 ° C.
Even at temperatures above ° C, the amount of vaporization actually decreased and there was a shortage of the amount of fuel required to fully demonstrate the performance of the engine. Further, regarding the starting, even if the starting can be performed with the fuel that is not sufficiently vaporized, there is a drawback that the fuel supply becomes insufficient in the practical operation as described above. In addition, the latent heat of vaporization is larger than that of gasoline, and when jetting from the nozzle, the temperature of the nozzle part may drop and cause icing phenomenon, which may result in operation failure. Therefore, warm the fuel container and promote vaporization. However, since all the stored fuel is heated, the portable small engine has a disadvantage that it is large in size and heavy in weight so that it cannot be put to practical use.

Further, once vaporized fuel may be liquefied again when the vaporizing chamber for adjusting the pressure and the pressure adjusting chamber are at a low temperature.

[0004]

The problem to be solved is that when the temperature of the outside air is low, insufficiently vaporized fuel is sucked, resulting in malfunction.

[0005]

The present invention provides a fixing device 33.
A fuel container 31 that is detachably attached to and fixed to store liquid fuel, and a vaporization chamber 35 adjacent to the fixing device 33 so that the liquid fuel flows in and vaporizes when the fuel container 31 is attached, and a vaporization chamber. 35 positioned above the pressure regulating chamber 41 pressure the vaporized fuel adjusting, the vaporized fuel in the pressure control chamber 41 and the mixer 11 which communicates with the communicating pipe 43 to supply mixed with air in the engine 1, Sharing a part of the outer wall of the vaporization chamber 35,
A heating chamber 49 having an inlet 51a and a discharge port 48 formed by a partition wall so as to surround the pressure adjusting chamber 41, and a heating chamber 49.
Muffler 7 for exhausting the exhaust 51a of the engine and the engine 1
The communication passage 51 which communicates with the jet outlet 17 and the opening 52 of the atmosphere communication near the inlet 51a of the warming greenhouse 49 at low temperature are closed, and when the temperature is high, the opening 52 is opened to exhaust the exhaust gas flowing into the inlet 51a to the atmosphere side. And a sensing device 55 equipped with a control valve 53 for escaping.

[0006]

[Function] Liquid fuel in the fuel container is ejected into the vaporization chamber,
The pressure is adjusted by the pressure control chamber, and the pressure is sucked into the engine through the mixer. Simultaneously with the start of operation, the hot air enters the heating chamber through the communication passage to heat the vaporizing chamber and the pressure regulating chamber.

With the passage of time, the heating temperature rises,
The fuel is sufficiently vaporized and sucked into the engine. Then, when the temperature becomes high, the control valve of the sensing device allows the exhaust gas to the greenhouse to escape to the atmosphere side, preventing an increase in engine back pressure.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

In the figure, a cylinder 5 is fixed above the crankcase 3 of the engine 1, and the cylinder 5 is fixed.
An exhaust port 9 communicating with the muffler 7 is formed on the side wall of the, and an intake port 15 communicating with the air cleaner 13 via the mixer 11 is opened on the other side wall. The muffler 7 is provided with exhaust gas ejection holes 17. On the crankshaft 19 supported by the crankcase 3, a connecting rod 21 has one end connected to the crankpin 2
3, and the other end is connected to a piston 25 which is slidable in the cylinder 5 via a piston pin 27. A spark plug 29 is provided on the top of the cylinder 5. A fixing device 33 to which a fuel container 31 for storing liquefied gas fuel in a liquid state is detachably attached is fixedly provided at the lower portion of the crankcase 3, and a vaporization chamber 35 integrally provided adjacent to the fixing device 33 is provided. The injection port 37 and the discharge port 39 of the fuel container 31 are formed so as to be hermetically sealed and engaged with each other. A pressure adjusting chamber 41 is provided above the vaporizing chamber 35 so as to communicate therewith, and the mixer 1 is connected via a communicating pipe 43.
It communicates with 1.

The vaporizing chamber 35, the pressure adjusting chamber 41, and the mixer 11
The vaporizing and mixing device 44 is constituted by and. The vaporizing and mixing device 44 is provided with a heating device 45. That is, a part of the outer circumference of the outer wall 47 of the vaporization chamber 35 and the pressure regulation chamber 4
A heating chamber 49 is formed by a partition wall having a discharge port 48 so as to cover the periphery of 1, and the heating chamber 49 has an inlet 51a and a communication passage 51.
It communicates with the ejection port 17 of the muffler 7 via. A control valve 53 is provided downstream of the communication passage 51 to adjust the passage area as described later and to open an opening 52 communicating with the atmosphere.
Is provided. The vaporization chamber 35 is provided with a sensing device 55 for sensing the temperature, and the control valve 53 is provided so as to operate in association with the operation of the sensing device 55. Further, a heating body 57 of a heat conductive metal rod such as copper is provided in the vaporization chamber 35 through the heating chamber 49.

Here, the opening 52 is provided in the vicinity of the engine exhaust inlet 51a of the greenhouse 52, that is, on the surface perpendicular to the inlet 51a, and is closed by the control valve 53 at low temperature to flow the exhaust into the greenhouse 49. Control valve 5 when the temperature is high
3 opens at an angle of about 45 ° to open the opening 52 and the inlet 5
The exhaust gas flowing into 1a is configured to escape to the atmosphere side through the opening 52.

In the above embodiment, the liquid fuel in the fuel container 31 is jetted into the vaporizing chamber 35, the pressure is adjusted by the pressure adjusting chamber 41, and the fuel is mixed by the pressure fluctuation caused by the movement of the piston 25 inside the engine 1. It is sucked into the cylinder 5 through the container 11 and burned. Simultaneously with the start of operation, the exhaust air enters the heating chamber 49 through the communication passage 51 to heat the vaporizing chamber 35 and the pressure regulating chamber 41, and the heating temperature rises with the passage of time, and the fuel required for the engine 1 is increased. Is vaporized and supplied. Also, by opening and closing the control valve 53 that appropriately adjusts the exhaust air as described above in accordance with the outside air temperature condition and the usage state,
A stable fuel supply can always be maintained. Then, when the temperature is high, the flow of exhaust gas into the heating chamber 49 is stopped,
Exhaust gas is allowed to escape to the atmosphere side from the opening portion 52 to prevent an increase in engine back pressure. Further, when the outside air temperature is low at the time of start-up and the vaporization condition is not stable, and it is difficult to maintain stable operation, the exposed portion of the heating element 57 is forcibly heated with a lighter or the like and vaporized in the heating chamber 49. By promoting the above, it is possible to stably supply the fuel.

[0013]

According to the present invention, by heating the vaporizing chamber and the pressure regulating chamber, the vaporized fuel is prevented from liquefying again without being influenced by the outside air environment, and the necessary fuel is vaporized and aired. It can be mixed with and stably supplied to the engine, and by using hot air, the heating device can be made compact and compact and can be used for a portable small engine.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Engine 11 ... Mixer 35 ... Vaporization chamber 41 ... Pressure regulation chamber 44 ... Evaporative mixing device 45 ... Heating device 55 ... Sensing device

Claims (1)

(57) [Claims] 1. A fuel container 31 which is detachably attached to a fixing device 33 and is fixed to store liquid fuel, and a fuel container 3.
And the vaporization chamber 35 adjacent to the fixing device 33 so that the liquid fuel to 1 at the time of mounting vaporizing inflowing fuel, located in the vaporizing chamber 35 above the pressure regulating chamber 41 pressure the vaporized fuel regulating, pressure regulating chamber 4
1 shares a part of the outer wall of the vaporization chamber 35 with the mixer 11 communicated with the communication pipe 43 so that the vaporized fuel is mixed with air and supplied to the engine 1. A heating chamber 49 having an inlet 51a and a discharge port 48 formed by partition walls, an inlet 51a of the heating chamber 49, and the engine 1
The communication passage 51 that communicates with the jet 17 of the muffler 7 that discharges the exhaust gas of the exhaust gas, and the opening 52 for the atmosphere communication that is opened near the inlet 51a of the warming greenhouse 49 when the temperature is low and the opening 52 when the temperature is high.
A fuel vaporization and mixing device for an engine provided with a sensing device 55 equipped with a control valve 53 for opening the exhaust gas to the inlet 51a and letting the exhausted gas flow to the atmosphere side.