CN214698005U

CN214698005U - Silencer with negative pressure air suction structure for two-stroke engine

Info

Publication number: CN214698005U
Application number: CN202121358869.5U
Authority: CN
Inventors: 曹鹏; 刘克强; 边存浩; 王乐宁
Original assignee: Shandong Yongjia Power Co ltd
Current assignee: Shandong Yongjia Power Co ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-11-12
Anticipated expiration: 2031-06-18

Abstract

The utility model discloses a two-stroke engine negative pressure structure muffler that induced drafts, it belongs to the internal-combustion engine field, and it has solved and has lacked a simple structure among the prior art, can effectively reduce exhaust temperature's two-stroke engine negative pressure structure muffler that induced drafts's problem. The catalytic reactor mainly comprises a rear cavity and a front cavity, wherein a catalytic cavity is arranged on the cavity wall of the rear cavity, and a back pressure cavity is arranged in the front cavity; an air outlet is formed in the front cover of the front chamber, and a fireproof net is arranged on the air outlet; an air outlet is formed outside the air outlet, an air outlet upper cover is arranged outside the air outlet, and the air outlet upper cover is connected with the front cover; and an exhaust port air deflector is arranged on the front cover and positioned on one side of the exhaust port upper cover. The utility model discloses mainly used internal-combustion engine.

Description

Silencer with negative pressure air suction structure for two-stroke engine

Technical Field

The utility model relates to an internal-combustion engine, specifically speaking especially relates to a two-stroke engine negative pressure structure muffler that induced drafts.

Background

Two-stroke engines have no valves, which greatly simplifies their structure and reduces their own weight compared to four-stroke engines. The engine can run in any direction, and the flexibility of the engine is greatly increased. The power is large, the device is light and simple, the maintenance is convenient, the device can be moved for a long time, and the manufacturing cost is low. Therefore, the small two-stroke engine is mostly matched and sleeved in the fields of garden machinery, plant protection machinery, small agricultural machinery and the like, and the social conservation quantity is very large. With the further tightening of emission regulations, in order to reduce exhaust pollutants, a catalyst is added in a muffler of the two-stroke engine to promote secondary combustion, so that the exhaust temperature of the engine is too high to meet the requirements of safety regulations.

Due to the addition of the catalyst, the internal temperature of the muffler is high, when the engine is suddenly reduced to idle speed at high speed, a large amount of unburned mixed gas is violently combusted through the catalyst, so that the exhaust temperature is high, and the condition is difficult to meet the requirements of developed countries such as Europe and America on the exhaust temperature of the engine.

Disclosure of Invention

An object of the utility model is to provide a two-stroke engine negative pressure structure muffler that induced drafts to solve and lack a simple structure among the prior art, can effectively reduce exhaust temperature's two-stroke engine negative pressure structure muffler that induced drafts's problem.

The utility model discloses a realize through following technical scheme:

a silencer with a negative pressure air suction structure for a two-stroke engine comprises a rear cavity and a front cavity, wherein a catalytic cavity is arranged on the cavity wall of the rear cavity, and a back pressure cavity is arranged in the front cavity; an air outlet is formed in the front cover of the front chamber, and a fireproof net is arranged on the air outlet; an air outlet is formed outside the air outlet, an air outlet upper cover is arranged outside the air outlet, and the air outlet upper cover is connected with the front cover; and an exhaust port air deflector is arranged on the front cover and positioned on one side of the exhaust port upper cover.

Furthermore, a negative pressure chamber is formed between the exhaust port upper cover and the exhaust port.

Furthermore, the exhaust port air deflector comprises an installation plate, an inclined plate and an upper baffle plate, and the installation plate is installed on the front cover through bolts.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the structure is simple, and the high-temperature gas after secondary combustion can effectively reduce the exhaust temperature through three-time cooling.

2. The upper baffle can prevent hot air from diffusing upwards, and the air guide plate of the air outlet can play a role in shunting.

Drawings

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

fig. 2 is a schematic structural diagram of the present invention;

fig. 3 is a schematic structural view of the exhaust port air deflector of the present invention.

In the figure: 1. a rear chamber; 2. a catalyst; 3. a back pressure chamber; 4. a front chamber; 5. a front cover; 6. a fire-proof net; 7. an exhaust port; 8. an exhaust port upper cover; 9. a negative pressure chamber; 10. an exhaust port air deflector; 11. a catalytic cavity; 12. a sloping plate; 13. mounting a plate; 14. and an upper baffle plate.

Detailed Description

The invention will be further described and illustrated with reference to the accompanying drawings.

Embodiment 1, a muffler with a negative pressure air suction structure for a two-stroke engine, comprising a rear chamber 1 and a front chamber 4, wherein a catalytic cavity 11 is arranged on the wall of the rear chamber 1, and a back pressure cavity 3 is arranged in the front chamber 4; an air outlet is formed in the front cover 5 of the front chamber 4, and a fireproof net 6 is arranged on the air outlet; an air outlet 7 is arranged outside the air outlet, an air outlet upper cover 8 is arranged outside the air outlet 7, and the air outlet upper cover 8 is connected with the front cover 5; an air outlet air deflector 10 is arranged on the front cover 5 and positioned on one side of the air outlet upper cover 8; a negative pressure chamber 9 is formed between the exhaust port upper cover 8 and the exhaust port 7; the exhaust port air deflector 10 comprises a mounting plate 13, an inclined plate 12 and an upper baffle plate 14, the mounting plate 13 is mounted on the front cover 5 through bolts, and the back pressure cavity 3 and the catalysis cavity 11 are welded together.

Catalyst 2 is contained in the catalyst chamber 11. After entering a rear cavity 1 of the muffler, the tail gas discharged after the combustion of the cylinder body is combusted for the second time under the action of a catalyst 2, high-temperature gas after the second time combustion enters a back pressure cavity 3, a gas outlet of the back pressure cavity 3 faces to the right above the muffler, the gas after the second time combustion enters a front cavity 4 of the muffler through a gas outlet of the back pressure cavity 3, the tail gas is subjected to pressure reduction and mixing in the cavity, and then sequentially passes through a gas outlet on a front cover 5 of the muffler and a fireproof net 6, primary temperature reduction is carried out on the fireproof net 6 and enters an exhaust port 7, the exhaust port 7 is arranged below an upper cover 8 of the exhaust port, the high-speed exhaust gas from the exhaust port 7 flows through the front half part of a negative pressure cavity 9 formed by the upper cover 8 of the exhaust port, at the moment, the tail gas flows through the front half part of the negative pressure cavity 9 at a high speed, so that the front half part forms a negative pressure area, and the rear half part of the negative pressure cavity 9 and external air can be sucked to the front half part of the negative pressure cavity 9, the tail gas is mixed with the high-temperature tail gas in the front half part of the negative pressure chamber 9 to reduce the temperature of the tail gas, the cooled tail gas flows through the exhaust port air deflector 10 and is subjected to the shunting action of the exhaust port air deflector 10, the tail gas can be mixed with the air again, and the temperature of the tail gas is reduced again. The temperature of the tail gas after being cooled for 3 times is greatly lower than the requirements of relevant regulations of developed countries such as Europe, America and the like.

Claims

1. The utility model provides a two-stroke engine negative pressure structure muffler that induced drafts, includes back cavity (1) and preceding cavity (4), is equipped with catalysis chamber (11), its characterized in that on the chamber wall of back cavity (1): a back pressure cavity (3) is arranged in the front cavity (4); an air outlet is formed in the front cover (5) of the front chamber (4), and a fireproof net (6) is arranged on the air outlet; an exhaust port (7) is arranged outside the air outlet, an exhaust port upper cover (8) is arranged outside the exhaust port (7), and the exhaust port upper cover (8) is connected with the front cover (5); an exhaust port air deflector (10) is arranged on the front cover (5) and positioned on one side of the exhaust port upper cover (8).

2. The two-stroke engine negative pressure suction structure muffler of claim 1, wherein: and a negative pressure chamber (9) is formed between the exhaust port upper cover (8) and the exhaust port (7).

3. The two-stroke engine negative pressure suction structure muffler of claim 1, wherein: the exhaust port air deflector (10) comprises an installation plate (13), an inclined plate (12) and an upper baffle plate (14), and the installation plate (13) is installed on the front cover (5) through bolts.