Secondary air supply device of silencer

Abstract

The utility model relates to a secondary air supply device of a silencer, which comprises a wind scooper and the silencer, the wind scooper is provided with an air supply valve structure for introducing cooling air in the wind scooper into the silencer, an air inlet elbow is arranged between the air supply valve structure and the silencer, and the wind scooper is provided with an air collecting hood. The opening of the gas collecting hood is arranged towards the rotating direction of the fan blades, cooling air can be thrown into the gas collecting hood by the eccentricity generated by rotation of the fan blades, so that more air can enter the gulp valve, and meanwhile, the size from the gas inlet to the gas outlet of the gas collecting hood is gradually reduced along the arc guide part; therefore, after the cooling air enters the gas collecting hood, the air speed of the cooling air is increased, the air volume of the cooling air is increased within the same time, the catalytic agent in the silencer can obtain sufficient and stable oxygen, HC and CO in tail gas can fully react, and emission of harmful substances is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of mufflers and relates to a secondary air supply device for a muffler. Background Art

[0002] With the increasingly high international and domestic standards for engine exhaust emissions, the exhaust emissions of engines can no longer meet the requirements of emission regulations. Existing secondary air supply valves are directly installed on an exhaust pipe or a branch pipe led out from a muffler. Utilizing the pulse effect of exhaust gas, the secondary air supply valve directly supplements fresh air in the environment into the muffler for the catalyst to use, achieving the natural air supply mode of the secondary air supply valve. However, when the exhaust pressure of the engine is small or the exhaust back pressure is large, the pulse effect of the exhaust gas is reduced, which will affect the air supply efficiency of the secondary air supply valve, reduce the off-engine purification efficiency of the catalyst, and cannot effectively reduce the exhaust emissions of the engine. Summary of the Utility Model

[0003] The purpose of the utility model is to address the above problems in the existing technology and propose a secondary air supply device for a muffler.

[0004] The purpose of the utility model can be achieved by the following technical solutions: A secondary air supply device for a muffler includes a wind guide cover and a muffler. A air supply valve structure for introducing the cooling air in the wind guide cover into the muffler is provided on the wind guide cover. An intake elbow is provided between the air supply valve structure and the muffler. A gas collecting hood is provided on the wind guide cover.

[0005] In the above-mentioned secondary air supply device for a muffler, the gas collecting hood is provided with an air inlet, an arc-shaped guiding portion, and an air outlet. The arc-shaped guiding portion is used to connect the air inlet and the air outlet.

[0006] In the above-mentioned secondary air supply device for a muffler, the air supply valve structure includes a valve body communicated with the wind guide cover. An upper cover is provided on the valve body. A valve cavity is formed between the valve body and the upper cover. A filter wire mesh is provided in the valve cavity. A corrugated sheet is further provided on the valve cavity. Air holes are opened on the corrugated sheet.

[0007] In the above-mentioned secondary air supply device for a muffler, the upper cover is communicated with the intake elbow.

[0008] In the above-mentioned secondary air supply device for a muffler, the opening of the gas collecting hood is arranged in the rotation direction of the wind blade.

[0009] In the above-mentioned secondary air supply device for a muffler, a positioning pin is provided on the upper cover, and a positioning hole matching the positioning pin is opened on the gas collecting hood.

[0010] Compared with the prior art, the utility model is provided with an air collecting hood, and the opening of the air collecting hood is arranged towards the rotating direction of the wind blade. The centrifugal force generated by the rotation of the wind blade can throw the cooling air into the air collecting hood, so that more air volume can enter the air supplement valve. At the same time, the size from the air inlet to the air outlet of the air collecting hood gradually becomes smaller along the arc guiding part, so that the wind speed of the cooling air is increased after entering the air collecting hood, the air volume of the cooling air is increased within the same time, and the catalyst of the catalyst in the muffler can obtain sufficient and stable oxygen, so that HC and CO in the tail gas can fully react, reducing the emission of harmful substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the utility model;

[0012] Figure 2 is an installation schematic diagram of the utility model;

[0013] Figure 3 is a schematic diagram of the air supplement valve structure of the utility model;

[0014] Figure 4 is a cross-sectional view of the air supplement valve structure of the utility model.

[0015] In the figure, 1, air guiding hood; 2, muffler; 3, air supplement valve structure; 31, valve body; 32, upper cover; 33, valve cavity; 34, filter wire mesh; 35, corrugated sheet; 4, intake elbow; 5, air collecting hood; 51, air inlet; 52, arc guiding part; 53, air outlet; 6, positioning pin; 7, positioning hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following are specific embodiments of the utility model and in combination with the attached drawings, the technical solutions of the utility model are further described, but the utility model is not limited to these embodiments. Embodiment

[0017] As Figures 1 to 4 shown, a muffler secondary air supplement device includes an air guiding hood 1 and a muffler 2. An air supplement valve structure 3 for introducing the cooling air in the air guiding hood 1 into the muffler 2 is arranged on the air guiding hood 1. The air supplement valve structure 3 includes a valve body 31 communicated with the air guiding hood 1. An upper cover 32 is arranged on the valve body 31. A valve cavity 33 is formed between the valve body 31 and the upper cover 32. A filter wire mesh 34 is arranged in the valve cavity 33. A corrugated sheet 35 is further arranged on the valve cavity 33, and air holes are formed in the corrugated sheet 35.

[0018] An intake elbow 4 is arranged between the air supplement valve structure 3 and the muffler 2, and the upper cover 32 is communicated with the intake elbow 4.

[0019] Install the air supplement valve structure 3 on the air guide cover 1, and use the fan blade in the air guide cover 1 to supplement air to the air supplement valve structure 3. The air supplement valve sends the supplemented fresh air into the intake elbow 4, and enters the catalyst of the muffler 2 together with the exhaust gas in the intake elbow 4 for treatment; in this way, the catalyst in the catalyst of the muffler 2 can obtain sufficient and stable oxygen, and HC and CO in the exhaust gas can fully react, ensuring that the content of harmful substances in the exhaust gas discharged from the muffler 2 meets the standards.

[0020] A gas collecting hood 5 is arranged on the air guide cover 1. The gas collecting hood 5 is provided with an air inlet 51, an arc guiding part 52 and an air outlet 53. The arc guiding part 52 is used to connect the air inlet 51 and the air outlet 53. The opening of the gas collecting hood 5 is arranged in the direction of the fan blade rotation. When the fan blade rotates, the centrifugal force generated by it can throw the cooling air into the gas collecting hood 5, so that more air volume can enter the air supplement valve. At the same time, the size of the gas collecting hood 5 from the air inlet to the air outlet gradually becomes smaller along the arc guiding part 52, so that the cooling air speed is increased after the cooling air enters the gas collecting hood 5, and the air volume of the cooling air is increased in the same time, further improving that the catalyst in the catalyst of the muffler 2 obtains sufficient and stable oxygen, and HC and CO in the exhaust gas can fully react, reducing the emission of harmful substances.

[0021] A positioning pin 6 is arranged on the upper cover 32, and a positioning hole 7 matching the positioning pin 6 is opened on the gas collecting hood 5. When the air supplement valve structure 3 is installed, the positioning pin 6 penetrates through the air guide cover 1 and inserts into the positioning hole 7 of the gas collecting hood 5, so as to realize the rapid installation of the air supplement valve structure 3. On the other side of the gas collecting hood 5, the staff can fix the gas collecting hood 5 and the upper cover 32 by bolts passing through the air guide cover 1.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar ways to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A muffler secondary air supply device, comprising an air guide cover (1) and a muffler (2), characterized in that: The air guide hood (1) is provided with an air supply valve structure (3) for passing the cooling air in the air guide hood (1) into the muffler (2); an air intake elbow (4) is provided between the air supply valve structure (3) and the muffler (2); the air guide hood (1) is provided with an air collecting hood (5); the air supply valve structure (3) comprises a valve body (31) connected to the air guide hood (1); an upper cover (32) is provided on the valve body (31); a valve cavity (33) is formed between the valve body (31) and the upper cover (32); a filter screen (34) is provided in the valve cavity (33); a corrugated sheet (35) is also provided on the valve cavity (33); and air holes are formed on the corrugated sheet (35).

2. A secondary air supply device for a muffler according to claim 1, characterized in that: The air collecting hood (5) is provided with an air inlet (51), a circular arc guide portion (52) and an air outlet (53), and the circular arc guide portion (52) is used to connect the air inlet (51) and the air outlet (53).

3. A secondary air supply device for a muffler according to claim 2, characterized in that: The upper cover (32) is connected to the air intake elbow (4).

4. A secondary air supply device for a muffler according to claim 3, characterized in that: The opening of the air collecting hood (5) is arranged towards the rotation direction of the fan blades.

5. A secondary air supply device for a muffler according to claim 4, characterized in that: The upper cover (32) is provided with a positioning pin (6), and the air collecting cover (5) is provided with a positioning hole (7) matching the positioning pin (6).

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