JPS5920517A - Afterburn preventing unit for internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent generation of afterburn in an exhaust pipe, by installing a metal wire filter, which is formed by piling metal wires in form of metal-net with specific dimensions up to the prescribed thickness, between an exhaust pipe inlet and a muffler inlet. CONSTITUTION:A metal wire filter 4 is inserted into the inlet 21 of an exhaust pipe 2 on the engine side or into an exhaust pipe 2 at an inlet 31 of a muffler 3. This metal wire filter 4 is formed by piling metal-net-shaped, heat resisting metal wires, which are 0.1-0.5mm. in dia. and 5 to 40 in mesh, up to 2 to 30mm. in thickness. With this contrivance, flames that go into the exhaust pipe 2 from a combustion chamber is suppressed by the metal wire filter 4, preventing afterburn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing combustion (afterburn) occurring in the exhaust pipe of an internal combustion engine.

The ignition timing of the engine has been shifted in order to prevent so-called afterburn, where unburned combustion from the engine's combustion chamber is discharged into the exhaust pipe and then re-combusted in the exhaust pipe. Countermeasures have been taken to prevent burning abandoned fires and to adjust the retting of the carrier, but these measures have the disadvantage of affecting engine performance and complicating the equipment. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an afterburn prevention device for an internal combustion engine that can reliably prevent a 7-knot turban with a simple configuration, while having little adverse effect on other engine performance.

Next, the present invention will be explained based on one embodiment shown in the drawings.

1 is a 4 recycle site valve single cylinder general purpose 1 engine, 2
Number 1 indicates the trachea, number 3 indicates the muffler. 4 is a metal wire filter fitted into the exhaust pipe 2 between the exhaust pipe inlet 21 on the engine side or the muffler port 31, and is made of heat-resistant metal and has a wire diameter of 0.1 mm or more and 0.5 mm or less; Made of overlapping wire mesh metal wires of 5 or more and 40 or more F, 2mm
It has a thickness of at least 30 mm.

This general-purpose engine has a problem in which the engine stops in a warm state after warm-up or operation, and when restarted, lid burn occurs frequently, mainly in the muffler 3 (2) 7 inside the exhaust pipe 2. Ta. However, the metal wire Noirter 4
By fitting the filter 4 into the exhaust pipe and extinguishing the flame emitted from the combustion chamber to the exhaust pipe, the afterburn can be almost completely prevented.

Example J No. 50cc, 44j cycle 1 noid valve medium cylinder general-purpose engine was warmed up by running it at 20,001 m for 15 minutes, then stopped for 1 () seconds and then running at 20 (1 () for 1 minute).
N'pm -'C operation, stop and start operations were repeated 20 times, and J-death was performed, and the Noilter made of stainless steel mesh wire with a wire diameter of 0.2 mm, #30, and thickness of 5 mm according to the present invention was installed in the exhaust pipe. When installed at the entrance of
A comparison was made between a case where a metal wire filter of 1.4 mm, #10, and a thickness of 20 mm was lightly compressed and installed at the entrance of a muffler, and a case where a metal wire filter was not installed as in the conventional case.

When the filter of the present invention was installed in [1], no afterburn occurred at all, whereas with the conventional exhaust pipe without a metal wire filter, afterburn occurred an average of 14.5 times. In the present invention, the filter has a wire diameter of 0.4 mm or more, a mesh of 40 or less, and a thickness of 2 m1.
The reason why it is set at 1 l is because if it is less than this, the flame extinguishing effect will be insufficient and the effect of preventing anotabern will be small. The reason why the filter has a wire diameter of 0.5 mm or more and a 1ζ mesh of 5 or more and a thickness of 30 mm or less is because if the filter is larger than this, the flow resistance of the exhaust gas will increase and the performance of other engines will be adversely affected, such as a decrease in engine output. FIG. 2 shows a case where the metal wire filter 4 of the present invention is installed at the inlet 21 of the trachea 2. By providing the filter removal section at the exhaust pipe inlet in this manner, the filter 4 can be installed without changing the specifications of the exhaust pipe, and the filter 4 can be easily replaced.

As described above, the afterburn prevention device for an internal combustion engine of the present invention has a wire mesh shape between the inlet of the exhaust pipe and the muffler port, which is made of heat-resistant metal and has a wire diameter of 0.1 mm or more and 0.5 mm or less and a mesh of 5 or more and 40 or less. Since it is made of overlapping metal wires and a filter with a thickness of 2 mm or more and 30 mm or less is fitted, it has a simple structure ('afterburn can be prevented and there is little chance of adversely affecting the performance of other engines.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an exhaust pipe using the 7-turbine prevention device of the internal combustion engine of the present invention, and FIG. 2 is a cutaway perspective view of the exhaust pipe section of another embodiment. In the diagram: 1...Engine 2...Exhaust pipe 3...Muffler 4...Metal wire filter Figure 1\

Claims (1)

[Claims] 1) Between the entrance of the II trachea and the muffler port, there is a wire mesh wire made of heat-resistant metal with a wire diameter of 0.1 mm or more and a wire diameter of 0.1 mm or more and a mesh size of 5 or more and 40 or less, stacked for 2 m.
An afterburn prevention device for an internal combustion engine, comprising a metal wire filter fitted with a thickness of 301111111 m or more.