CN212296575U

CN212296575U - Labyrinth type low-emission cooling silencer for small gasoline engine

Info

Publication number: CN212296575U
Application number: CN202020489836.3U
Authority: CN
Inventors: 刘永根; 徐华俊; 苑文龙; 杨慧明; 陈军
Original assignee: Zhejiang Painier Technology Inc
Current assignee: Zhejiang Painier Technology Inc
Priority date: 2020-04-07
Filing date: 2020-04-07
Publication date: 2021-01-05
Anticipated expiration: 2030-04-07

Abstract

The utility model discloses a labyrinth type low-emission cooling silencer for a small gasoline engine, which comprises a front cover and a rear cover which are combined into a whole by adopting a flanging riveting process, wherein a flange plate is arranged on the outer side of the front cover, the front cover and the rear cover form a sealed cavity, a middle partition plate is arranged inside the sealed cavity, and the sealed cavity is divided into an expansion chamber and a resonance chamber by the middle partition plate; and an air inlet communicated with the expansion chamber is formed in the position, corresponding to the middle part of the flange, of the front cover. This small-size petrol is with low cooling muffler of arranging of labyrinth, the inertia effect and the pulsation effect that utilize high-speed air current to produce, the discharge of waste gas and the entering of new gas can be accelerated to can prevent the new gas that has got into the cylinder to be discharged, and the labyrinth passageway has also eliminated simultaneously and has touched the red and flame projecting phenomenon that forms behind the medium purification tail gas, effectively protected spare part around the muffler, reduce the muffler bulk temperature, the sound construction is durable, performance safe and reliable.

Description

Labyrinth type low-emission cooling silencer for small gasoline engine

Technical Field

The utility model relates to a small-size gasoline engine technical field specifically is a labyrinth hangs down cooling muffler for small-size gasoline engine.

Background

The small gasoline engine silencer has the advantages that the exhaust energy is large, high-temperature waste gas has strong pressure propagation and superposition in the exhaust pipe, various silencing units such as an expansion chamber and a resonance chamber are formed in the small gasoline engine silencer through parts such as pipelines and partition plates, the exhaust pressure wave is continuously reflected and interfered when being propagated, low-frequency and medium-frequency band noise is eliminated, the acoustic energy is reduced, and the high-temperature waste gas can be safely and effectively discharged, so that the silencing purpose is achieved. On the other hand, with the increasing of environmental protection in various countries in the world, the interior of the silencer needs to adopt a three-way catalyst as a catalyst medium, and the catalyst can perform chemical reaction on harmful components like a filter to convert the harmful components into harmless gas so as to meet the requirements of environmental protection regulations.

The existing common silencer is formed by simple riveting and pressure welding and is divided into an expansion chamber and a resonance chamber, the inertia effect and the pulsation effect of exhaust pressure waves are not considered, and meanwhile, a three-way catalyst type catalyst medium is additionally arranged to meet the regulation requirements to purify waste gas. However, the catalyst is unreasonable in layout, and the high-temperature red or even flaming phenomenon is easy to occur during waste gas purification, so that other parts close to the silencer cannot be effectively protected, the service life of the whole machine is shortened, and the safety risk of operators is increased.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is overcome current defect, the utility model provides a low cooling muffler of arranging of labyrinth for small-size gasoline engine, utilize inertial effect and the pulsation effect that high velocity air produced, can accelerate the discharge of waste gas and the entering of new gas, and can prevent the new gas that has got into the cylinder by discharge, and the labyrinth passageway has also eliminated simultaneously and has touched reddish and flame projecting phenomenon that forms behind the medium purification tail gas, effectively protected the spare part around the muffler, reduce muffler bulk temperature, the sound construction is durable, the safe and reliable performance, can effectively solve the problem in the background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a low cooling muffler of arranging of labyrinth for small-size gasoline engine, includes and adopts turn-ups riveting process to close front shroud and back shroud as an organic whole, the outside of front shroud is equipped with the ring flange, sealed chamber is constituteed with the back shroud to the front shroud, the inside in sealed chamber is equipped with the median septum, the median septum falls into expansion chamber and resonance chamber with sealed chamber.

The position that the front shroud corresponds with the ring flange middle part is provided with the air inlet with the expansion chamber intercommunication, the side middle part of median septum is equipped with the catalyst medium, the inside of resonance chamber is equipped with the catalyst guard shield, and the top of median septum is equipped with the passageway with resonance chamber intercommunication, resonance indoor portion is equipped with backplate and preceding baffle in proper order along the upper end and the lower extreme of gas flow direction, and the side upper end of rear shroud is equipped with the gas vent.

As an optimized technical scheme of the utility model, catalyst guard shield, backplate and preceding baffle cause labyrinth passageway in resonance indoor portion.

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

the utility model discloses a small-size petrol is with low cooling muffler of arranging of labyrinth utilizes inertial effect and the pulsation effect that high velocity air produced, can accelerate the discharge of waste gas and the entering of new gas to can prevent the new gas that has got into the cylinder to be discharged, and labyrinth passageway has also eliminated simultaneously and has touched the red and flame projecting phenomenon that forms behind the medium purification tail gas, has effectively protected spare part around the muffler, reduce the muffler bulk temperature, and the sound construction is durable, performance safe and reliable.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a left side view of the structure of fig. 1.

In the figure: the device comprises a flange 1, a front cover 2, an expansion chamber 3, a resonance chamber 4, a catalyst medium 5, a middle partition plate 6, a catalyst shield 7, a rear cover 8, a front baffle 9, a rear baffle 10, an exhaust port 11 and an air inlet 12.

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 work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a low cooling muffler of arranging of labyrinth for small-size gasoline engine, includes and adopts turn-ups riveting process to close front shroud 2 and back shroud 8 as an organic whole, and the outside of front shroud 2 is equipped with ring flange 1, and front shroud 2 and back shroud 8 constitute sealed chamber, and the inside in sealed chamber is equipped with median septum 6, and median septum 6 will seal the chamber and fall into expansion chamber 3 and resonance chamber 4.

The front cover 2 is provided with an air inlet 12 communicated with the expansion chamber 3 at a position corresponding to the middle part of the flange plate 1, high-temperature and high-speed waste gas discharged after the combustion of the engine rushes into the expansion chamber 3 from the air inlet 12, the volume is expanded and expanded rapidly in an instant, negative pressure is generated at the air inlet 12, the waste gas is favorably discharged, and the noise elimination effect is generated at the same time.

Catalyst medium 5 is arranged in the middle of the side face of the middle partition plate 6, a catalyst shield 7 is arranged inside the resonance chamber 4, a channel communicated with the resonance chamber 4 is arranged at the top of the middle partition plate 6, a rear baffle 10 and a front baffle 9 are sequentially arranged at the upper end and the lower end of the interior of the resonance chamber 4 along the gas flowing direction, an exhaust port 11 is arranged at the upper end of the side face of the rear cover 8, waste gas in the expansion chamber 3 is purified by the catalyst medium 5 and enters the resonance chamber 4 through the channel at the top of the middle partition plate 6, and gas inside the resonance chamber 4 forms pulse waves through the front baffle 9 and the rear baffle 10 according to the fluid mechanics pulse principle and is discharged at the exhaust port 11.

The catalyst shield 7, the rear baffle plate 10 and the front baffle plate 9 form a labyrinth passage in the resonant chamber 4, a long-time negative pressure area can be quickly formed in the exhaust port 11, and a large amount of exhaust gas is sucked out, so that the fresh air charge in the cylinder is increased; and in the later stage of exhaust, a positive pressure area can be formed in the exhaust port 11 to prevent the new gas which enters the cylinder from being exhausted, and meanwhile, the positive pressure can improve the gas pressure in the cylinder, so that the compression ratio is improved to achieve the purpose of improving the performance.

On the other hand, the labyrinth passage also eliminates the red and flaming phenomena formed after the catalyst medium 5 purifies the tail gas, effectively protects the parts around the silencer, reduces the integral temperature of the silencer, and has firm and durable structure and safe and reliable performance.

Whole small-size petrol is with low cooling muffler of arranging of labyrinth, utilize inertia effect and the pulsation effect that high-speed air current produced, can accelerate the discharge of waste gas and the entering of new gas, and can prevent the new gas that has got into the cylinder to be discharged, and the labyrinth passageway has also eliminated simultaneously and has touched 5 red and flame projecting phenomena that form behind the purification tail gas of medium, effectively protected spare part around the muffler, reduce the muffler bulk temperature, the sound construction is durable, performance safe and reliable.

When in use:

high-temperature and high-speed waste gas discharged after the combustion of the engine rushes into the expansion chamber 3 from the air inlet 12, the volume is expanded and expanded instantly and rapidly, negative pressure is generated at the air inlet 12, the waste gas is favorably discharged, and the noise elimination effect is generated at the same time;

waste gas in the expansion chamber 3 is purified by a catalyst medium 5 and then enters the resonance chamber 4 through a channel at the top of the middle partition plate 6, and gas in the resonance chamber 4 forms pulse waves through a front baffle plate 9 and a rear baffle plate 10 according to the fluid mechanics pulse principle and is exhausted at an exhaust port 11;

the pulse wave is reflected back to the air inlet 12 after meeting the inner wall of the rear cover 8, and negative pressure is formed to be beneficial to the removal of waste gas;

the labyrinth passage also eliminates the red and flaming phenomena formed after the catalyst medium 5 purifies the tail gas.

The utility model discloses utilize inertial effect and the pulsation effect that high-speed air current produced, can accelerate the discharge of waste gas and the entering of new gas, and can prevent the new gas that has got into the cylinder to be discharged, and labyrinth passageway has also eliminated simultaneously and has touched 5 spare parts on every side of muffler that form behind the tail gas purification of medium and reddened and flame projecting phenomenon, effectively protected the muffler, reduce the muffler bulk temperature, the sound construction is durable, the performance safe and reliable.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that 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. The utility model provides a low cooling muffler of arranging of labyrinth for small-size gasoline engine, includes and adopts turn-ups riveting process to close front shroud (2) and back shroud (8) as an organic whole, the outside of front shroud (2) is equipped with ring flange (1), sealed chamber, its characterized in that are constituteed in front shroud (2) and back shroud (8): a middle partition plate (6) is arranged inside the sealed cavity, and the sealed cavity is divided into an expansion chamber (3) and a resonance chamber (4) by the middle partition plate (6);

the utility model discloses a gas turbine generator, including preceding cover (2) and ring flange (1), the position that corresponds in the middle part of preceding cover (2) and ring flange (1) is provided with air inlet (12) with expansion chamber (3) intercommunication, the side middle part of median septum (6) is equipped with catalyst medium (5), the inside of resonance chamber (4) is equipped with catalyst guard shield (7), and the top of median septum (6) is equipped with the passageway with resonance chamber (4) intercommunication, resonance chamber (4) inside upper end and the lower extreme along the gas flow direction are equipped with backplate (10) and preceding baffle (9) in proper order, and the side upper end of back cover (8) is equipped with gas vent (11).

2. The labyrinth type low-exhaust temperature reduction muffler for the small gasoline engine as set forth in claim 1, wherein: the catalyst shield (7), the tailgate (10) and the front tailgate (9) create a labyrinth passage inside the resonance chamber (4).