JPH082458Y2 - Vaporizer mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a carburetor mounting device for a portable small engine.

(Prior Art and Problems to be Solved) Conventionally, in this type of engine, a carburetor having an outlet having a cross-sectional area smaller than the inlet of the engine is attached to the inlet through an insulator for heat insulation. It was The inner diameter hole of this insulator is designed so that the opening on the carburetor side matches the shape of the outlet of the carburetor, the opening on the engine side matches the shape of the intake port, and the middle thereof gradually changes. It was Therefore, when the fuel vaporized by the vaporizer passes through the insulator, a part of it is liquefied again due to the temperature decrease and the pressure increase due to the expansion of the air-fuel mixture and adheres to the inside of the insulator to accumulate, causing the engine to tilt. When it was made to flow, it flowed in from the intake port, causing an engine malfunction.

(Means and Actions for Solving the Problems) The present invention is provided with an engine intake port 17 and an insulator 11
In an engine equipped with a carburetor 13 having an outlet 21 having a cross-sectional area smaller than that of the intake port 17, the inner diameter hole 19 of the insulator 11 is provided over the entire length of the outlet.
A cylindrical body that has the same cross-sectional area as 21 and has an inner diameter hole 19 formed inside.
Between the outer periphery of 23 and the body of the insulator 11, the intake port
A space portion 25 communicating with 17 is formed, and a communication hole 27 that communicates the inner diameter hole 19 and the space portion 25 is provided in the cylindrical body 23.

According to the present invention, the air-fuel mixture does not expand in the inner diameter hole of the insulator but expands at the inlet of the intake port, and the fuel in the air-fuel mixture tries to liquefy again and adhere to the inner wall of the intake port. Since it is heated by the heat of, it will not vaporize again and will not be sucked and accumulated. Further, the fuel droplets adhering to the inside diameter holes of the insulator are sucked into the space through the communication holes, vaporized there, and finally sucked into the engine, so that the fuel does not accumulate.

Also, by dividing the inside of the insulator,
When the liquefied air-fuel mixture is sucked into the other divided chambers inside the insulator, it vaporizes again and does not accumulate.

(Embodiment) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

A cylinder 3 into which a piston 1 is slidably fitted is equipped with an ignition plug 5 at its top, and a side part thereof is connected to an exhaust port 9 communicating with a muffler 7 and a carburetor 13 and an air cleaner 15 via an insulator 11. The intake port 17 that opens is open. The inner diameter hole 19 of the insulator 11 is a carburetor 13 over the entire length.
It has the same shape as the outflow port 21 of. Inner hole in inner diameter
Between the outer periphery of the tubular body 23 forming 19 and the main body of the insulator 11, the carburetor 13 side is directed toward the intake port 17 side, and thus the outer peripheral shape of the tubular body 23 is gradually changed to the shape of the intake port 17. A space 25 having a changing shape is formed, and communicates with the inner diameter hole 19 through a communication hole 27, which is a long hole cut out in the cylindrical body 23 in the axial direction. The insulator 11 is attached to the intake port 17 by the bolt 29.
The carburetor 13 is fixed to the insulator 11 by a bolt 31.

In the above embodiment, the air-fuel mixture mixed with the fuel vaporized in the vaporizer 11 does not expand when passing through the insulator 11, so the fuel is hardly liquefied and the intake port 17 near the end of the insulator 11 Although it tries to expand and liquefy at the inlet, it does not accumulate because the intake 17 is heated and immediately vaporized and sucked. In addition, some of the unvaporized liquid particulate fuel in the air-fuel mixture has internal diameter holes 19
Although it touches and adheres to the inner wall of the above, it flows down along the wall surface, is sucked into the space 25 from the communication hole 27, is vaporized, and is sucked into the intake port 17.

[Effect of device]

According to the present invention, it is possible to prevent the fuel in the air-fuel mixture from liquefying and staying in the insulator, and prevent the engine from malfunctioning when the engine is tilted.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention, FIGS. 2 and 3 are front views of lines II-II and III-III of FIG. 1, respectively, and FIGS. It is the side sectional view and plane sectional view of a part. 11 ... Insulator 13 ... Vaporizer 17 ... Intake port 19 ... Inner diameter hole 21 ... Outflow hole 23 ... Cylindrical body 25 ... Space part 27 ... Communication hole

Claims (1)

[Scope of utility model registration request] 1. An insulator 11 is attached to an engine intake port 17.
In an engine equipped with a carburetor 13 having an outlet 21 having a cross-sectional area smaller than that of the intake port 17, the inner diameter hole 19 of the insulator 11 is provided over the entire length of the outlet.
A cylindrical body that has the same cross-sectional area as 21 and has an inner diameter hole 19 formed inside.
Between the outer periphery of 23 and the body of the insulator 11, the intake port
A vaporizer mounting device in which a space portion 25 communicating with 17 is formed, and a communication hole 27 for communicating the inner diameter hole 19 and the space portion 25 is provided in the cylindrical body 23.