CN218177339U

CN218177339U - Reverse spraying prevention structure of two-stroke internal combustion engine

Info

Publication number: CN218177339U
Application number: CN202221697694.5U
Authority: CN
Inventors: 何涛涛; 李树阳; 程聪
Original assignee: Zhejiang Painier Technology Inc
Current assignee: Zhejiang Painier Technology Inc
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2022-12-30
Anticipated expiration: 2032-07-01

Abstract

The utility model relates to a two-stroke piston internal-combustion engine technical field just discloses a two-stroke internal-combustion engine prevents structure of spouting, including the internal-combustion engine main part, the top of internal-combustion engine main part is provided with the spark plug, is provided with the cylinder below the spark plug, is provided with the piston below the cylinder, and the lower part of internal-combustion engine main part is rotated and is connected with the axle linkage assembly, the left side fixedly connected with intake pipe of spark plug, the left side fixedly connected with carburetor of intake pipe, the left side fixedly connected with of carburetor has the air filter, and the inside of air filter is provided with the filter core. When the piston moves upwards from the lower dead point, the crankcase does not generate negative pressure any more, the reed valve is closed, air intake stops, the piston is pushed towards the lower dead point due to the fact that combustion work is started in the cylinder, pressure begins to increase, pressure in the crankcase can be gradually increased, mixed gas entering the crankcase cannot reversely spray the air filter from the air inlet pipe any more, and therefore the phenomenon that reverse spraying of the gas is prevented in the running process of the engine is achieved.

Description

Reverse injection prevention structure of two-stroke internal combustion engine

Technical Field

The utility model relates to a two-stroke piston internal-combustion engine technical field specifically is a two-stroke internal-combustion engine prevents structure of spouting.

Background

The two-stroke internal combustion engine belongs to a kind of internal combustion engine, it means an internal combustion engine which completes a work cycle in two strokes, its work cycle includes air intake, compression, combustion expansion and exhaust, the air intake of the two-stroke internal combustion engine is supplied to the cylinder through the scavenging port arranged along the circumference of the cylinder, and the opening and closing of the scavenging port is controlled by the piston, there are three ports on the engine cylinder block, namely air intake, exhaust, scavenging port, these three ports are closed by the piston at a certain moment respectively, its work cycle includes two strokes, the first stroke: the piston moves upwards from the lower dead point, the air inlet starts to be opened, the gas mixture flows into the crankcase, the scavenging port and the exhaust port are closed in succession, the combustible mixed gas entering the combustion chamber of the cylinder is compressed, and the second stroke is as follows: when the piston moves to be close to the top dead center, the spark plug ignites the gas mixture, the explosion pressure pushes the piston to move downwards to do work, and when the exhaust port is opened, the waste gas rushes out; at the moment, the air inlet is closed, the pressure in the crankcase is gradually increased, then the scavenging port is opened, the pre-compressed gas mixture rushes into the cylinder, and the residual exhaust gas is expelled, but because of the inherent defect of the structure of the two-stroke internal combustion engine, namely when the engine exhausts in the second stroke, the air inlet cannot be immediately closed, so that the mixed gas just sucked into the crankcase can partially escape from the proceeding port due to the influence of pressure difference and then reversely spray into the air filter through the air inlet pipe, and a filter element (most of the filter element uses sponge and paper) playing a role of filtering air in the air filter is soaked by the reversely sprayed gas mixture, so that the efficiency is reduced, the power of the engine is influenced, the rotating speed is not increased, and the partition plate added in the air filter can really prevent the gas mixture from directly spraying back to the filter element, but the gas mixture is gas composed of air, atomized two-stroke engine oil and gasoline, can wander around the air filter and finally adheres to the filter element. Along with the increase of the service time, the gasoline attached to the filter element is volatile and can volatilize into the air, but the two-stroke engine oil has no volatility and can be remained on the filter element all the time, and finally the filter element can be still damaged, so that the engine can not work normally.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

To prior art's not enough, the utility model provides a two-stroke internal-combustion engine prevents structure of spouting possesses the solution two-stroke engine operation in-process, can spout gas mixture back and advance empty filter, leads to the advantage that the filter core damaged, has solved two-stroke engine oil and has not volatility and stay on the filter core, can destroy the problem of filter core.

(II) technical scheme

In order to achieve the above object, the utility model provides a following technical scheme: the two-stroke internal combustion engine anti-reverse-injection structure comprises an internal combustion engine main body, wherein a spark plug is arranged at the top of the internal combustion engine main body, a cylinder is arranged below the spark plug, a piston is arranged below the cylinder, and the lower part of the internal combustion engine main body is rotatably connected with a shaft connecting rod assembly.

Preferably, an air inlet pipe is fixedly connected to the left side of the spark plug, and a carburetor is fixedly connected to the left side of the air inlet pipe.

Preferably, an air filter is fixedly connected to the left side of the carburetor, and a filter element is arranged inside the air filter.

Preferably, the inside of the air inlet pipe is provided with a one-way valve, and the inside of the carburetor is provided with a fuel mixture inlet.

Preferably, a crankcase is provided on a right side of the engine main body.

Preferably, the cylinders are symmetrical to each other about the spark plug.

Compared with the prior art, the utility model provides a two-stroke internal-combustion engine prevents structure of spouting possesses following beneficial effect:

1. according to the anti-reverse-injection structure of the two-stroke internal combustion engine, when the piston moves upwards from the bottom dead center, the air inlet is not opened, and the air outlet is opened. The pressure in the crankcase is reduced until the piston moves to the air inlet and is opened, because the pressure of the crankcase is smaller than the external air pressure, the reed valve is opened, pure air can be filtered through the filter element in the air firstly and then is mixed with gasoline atomized by the carburetor, and finally enters the crankcase of the engine through the air inlet pipe until the piston moves to the top dead center, the crankcase does not generate negative pressure any more, the reed valve is closed, and air inlet is stopped. And because the combustion work is started in the cylinder, the pressure begins to increase, and the piston is pushed towards the bottom dead center, the pressure in the crankcase can be gradually increased in the process, but because the reed valve is closed, the mixed gas of the crankcase which enters in the prior art can not reversely spray the air filter from the air inlet pipe, so that the phenomenon of preventing the reverse spraying gas in the running process of the engine is realized, and the effect of preventing the filter element from being damaged due to the fact that the reverse spraying gas mixture enters the air filter in the running process of the two-stroke engine is achieved.

Drawings

FIG. 1 is a schematic sectional view of the inside of the structure of the present invention;

fig. 2 is an enlarged schematic view of the area a in fig. 1 according to the present invention.

Wherein: 1. a spark plug; 2. a cylinder; 3. a piston; 4. a shaft link assembly; 5. an air filter; 6. a filter element; 7. a crankcase body; 8. a carburetor; 9. an air inlet pipe; 10. a one-way valve; 11. a fuel mixture intake port; 12. an internal combustion engine body.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Referring to fig. 1-2, the anti-reverse-injection structure for the two-stroke internal combustion engine comprises an internal combustion engine main body 12, a spark plug 1 is arranged at the top of the internal combustion engine main body 12, a cylinder 2 is arranged below the spark plug 1, a piston 3 is arranged below the cylinder 2, and a shaft-connecting rod assembly 4 is rotatably connected to the lower part of the internal combustion engine main body 12.

Specifically, an air inlet pipe 9 is fixedly connected to the left side of the spark plug 1, and a carburetor 8 is fixedly connected to the left side of the air inlet pipe 9.

Specifically, an air filter 5 is fixedly connected to the left side of the carburetor 8, and a filter element 6 is arranged inside the air filter 5.

Specifically, a check valve 10 is provided inside the intake pipe 9, and a fuel mixture intake port 11 is provided inside the carburetor 8.

Specifically, a crankcase body 7 is provided on the right side of the engine main body 12.

Specifically, the cylinders 2 are symmetrical with respect to the spark plug 1.

When the piston 3 moves upwards from the lower dead point in use, the air inlet is not opened, and the air outlet is opened. The pressure in the crankcase is reduced until the piston 3 runs to the air inlet and is opened, because the pressure of the crankcase is smaller than the external air pressure, the reed valve is opened, pure air can be filtered by the filter element 6 in the air firstly and then mixed with gasoline atomized by the carburetor 8, and finally enters the crankcase of the engine through the air inlet pipe 9 until the piston 3 runs to the top dead center, the crankcase does not generate negative pressure, the reed valve is closed, and air inlet is stopped. And because the combustion work is started in the cylinder, the pressure begins to increase, and the piston 3 is pushed towards the bottom dead center, the pressure in the crankcase can be gradually increased in the process, but because the reed valve is closed, the mixed gas of the crankcase which enters before can not reversely spray the air filter 5 from the air inlet pipe 9, so that the phenomenon of preventing the reverse spraying of the gas in the running process of the engine is realized, and the effect of preventing the filter element from being damaged due to the fact that the reverse spraying of the gas mixture enters the air filter in the running process of the two-stroke engine is achieved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A two-stroke internal combustion engine anti-reverse injection structure comprising an internal combustion engine main body (12), characterized in that: the top of the internal combustion engine main body (12) is provided with a spark plug (1), a cylinder (2) is arranged below the spark plug (1), a piston (3) is arranged below the cylinder (2), and the lower part of the internal combustion engine main body (12) is rotatably connected with a shaft connecting rod assembly (4).

2. A two-stroke internal combustion engine anti-reverse injection structure according to claim 1, characterized in that: an air inlet pipe (9) is fixedly connected to the left side of the spark plug (1), and a carburetor (8) is fixedly connected to the left side of the air inlet pipe (9).

3. A two-stroke internal combustion engine anti-reverse injection structure according to claim 2, characterized in that: an air filter (5) is fixedly connected to the left side of the carburetor (8), and a filter element (6) is arranged inside the air filter (5).

4. A two-stroke internal combustion engine anti-reverse injection structure according to claim 2, characterized in that: the air inlet pipe (9) is internally provided with a one-way valve (10), and the carburetor (8) is internally provided with a fuel mixture inlet (11).

5. A two-stroke internal combustion engine anti-reverse injection structure according to claim 1, characterized in that: a crankcase body (7) is arranged on the right side of the internal combustion engine main body (12).

6. A two-stroke internal combustion engine anti-reverse injection structure according to claim 1, characterized in that: the cylinders (2) are symmetrical left and right by taking the spark plugs (1) as centers.