Low-exhaust-back-pressure catalytic silencer

Abstract

The utility model discloses a low exhaust back pressure catalytic silencer, which belongs to the field of tail gas treatment devices and comprises an air inlet pipe, an exhaust pipe and a treatment tank arranged between the exhaust pipe and the air inlet pipe, the treatment tank is of a spherical structure, a spherical air inlet cavity is arranged at the center of the interior of a treatment device, and a plurality of treatment layers are sequentially arranged outside the spherical air inlet cavity. The air inlet pipe penetrates through the treatment tank and the treatment layer and is communicated with the air inlet cavity; the exhaust pipe is connected to the treatment tank. Waste gas is exhausted into the spherical gas inlet cavity through the gas inlet pipe, sequentially passes through the diesel oxidation catalyst layer, the diesel particulate matter filtering layer and the selective catalytic reduction layer, finally enters the treatment tank and is exhausted into the atmosphere through the exhaust pipe. The treatment tank arranged in a spherical shape and all the treatment layers are arranged in a spherical shape, waste gas diffuses from the center to all angles around when passing through all the treatment layers, the exhaust efficiency is improved, and the waste gas treatment efficiency is improved. And compared with other packaging structures, the exhaust back pressure can be reduced by about 30%, and the circulating oil consumption is reduced by 2%.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment devices, and more specifically, to a low exhaust back pressure catalytic muffler. Background Technology

[0002] A catalytic converter is an engine exhaust treatment device. Currently, the China VI emission standard catalytic converter consists of three parts: DOC (diesel oxidation catalyst), DPF (diesel particulate filter), and SCR (selective catalytic reduction). Engine exhaust first flows through the DOC, then through the DPF, then through the SCR, and finally the exhaust gas that meets emission standards is released into the atmosphere. The encapsulation structure of catalytic converters mainly includes cylindrical, U-shaped, and S-shaped types. Although the encapsulation structures differ, the exhaust flow path is always from DOC to DPF and then to SCR. Although these encapsulation structures are widely used in the market, they all suffer from high exhaust back pressure. The exhaust back pressure of a diesel engine catalytic converter is generally (30-40) kPa. Excessive exhaust back pressure makes it difficult for the engine to exhaust, and residual exhaust gas occupies the cylinder space. This not only leads to increased engine temperature and accelerated wear of parts, but also reduces the engine's intake air volume, causing incomplete combustion. To maintain power, the engine electronic control increases the fuel injection volume, resulting in increased fuel consumption and poorer fuel economy. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the present invention adopts the following technical solution.

[0004] This invention provides a low exhaust back pressure catalytic muffler, which can reduce exhaust back pressure, improve fuel economy, and enhance engine reliability.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This utility model provides a low exhaust back pressure catalytic muffler, including an intake pipe, an exhaust pipe, and a treatment tank disposed between the exhaust pipe and the intake pipe. The treatment tank has a spherical structure, and a spherical intake chamber is disposed at the center of the processor. Multiple treatment layers are disposed sequentially outside the spherical intake chamber. The intake pipe passes through the treatment tank and the treatment layers and communicates with the intake chamber. The exhaust pipe is connected to the treatment tank.

[0007] In a preferred embodiment of this invention, the treatment layer comprises, from the inside out, a diesel oxidation catalyst layer, a diesel particulate filter layer, and a selective catalytic reduction layer.

[0008] In a preferred embodiment of this invention, the spherical air inlet cavity is provided with a vent hole.

[0009] In a preferred embodiment of this invention, a gap is left between the outermost processing layer and the inner wall of the processing tank.

[0010] In a preferred embodiment of this invention, adjacent processing layers are separated by a mesh.

[0011] In a preferred embodiment of this invention, the diesel oxidation catalyst layer is arranged in a spherical shape.

[0012] In a preferred embodiment of this invention, the diesel particulate filter layer is spherically shaped and is wrapped around the diesel oxidation catalyst layer.

[0013] In a preferred embodiment of this invention, the selective catalytic reduction layer is spherically shaped and is wrapped around the outside of the diesel particulate filter layer.

[0014] The beneficial effects of this utility model are as follows:

[0015] This utility model provides a low exhaust back pressure catalytic converter. Exhaust gas is discharged into a spherical intake chamber through an intake pipe, where it sequentially passes through a diesel oxidation catalyst layer, a diesel particulate filter layer, and a selective catalytic reduction layer before finally entering the treatment tank and being discharged into the atmosphere through the exhaust pipe. The spherical design of the treatment tank and each treatment layer allows the exhaust gas to diffuse outwards from the center at various angles as it passes through each layer, improving exhaust efficiency and overall exhaust gas treatment efficiency. This spherical structure can reduce exhaust back pressure to below 25 kPa, which is approximately 30% lower than other encapsulation structures. It can also reduce cycle fuel consumption by 2%. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a low exhaust back pressure catalytic muffler provided in a specific embodiment of this utility model.

[0017] In the picture:

[0018] 1. Intake pipe, 2. Exhaust pipe, 3. Treatment tank, 4. Spherical intake chamber, 5. Diesel oxidation catalyst layer, 6. Diesel particulate filter layer, 7. Selective catalytic reduction layer, 8. Separator. Detailed Implementation

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1As shown, the embodiment provides a low exhaust back pressure catalytic muffler, including an intake pipe 1, an exhaust pipe 2, and a treatment tank 3 disposed between the exhaust pipe 2 and the intake pipe 1. The treatment tank 3 has a spherical structure, and a spherical intake chamber 4 is disposed at the center of the processor. Multiple treatment layers are disposed sequentially outside the spherical intake chamber 4. The intake pipe 1 passes through the treatment tank 3, the treatment layers, and communicates with the intake chamber. The exhaust pipe 2 is connected to the treatment tank 3.

[0021] Engine exhaust gas is guided into the spherical intake chamber 4 through the intake pipe 1. Within the spherical intake chamber 4, the exhaust gas disperses in all directions, increasing its velocity. As the exhaust gas diffuses outward from the spherical intake chamber 4, it passes through each treatment layer in sequence, where various harmful substances are removed, ultimately resulting in exhaust gas that meets emission standards. After exiting the outermost treatment layer, the exhaust gas flows from the treatment tank 3 into the exhaust pipe 2, and is then discharged into the atmosphere through the exhaust pipe 2. The structure of this muffler optimizes the exhaust direction from the traditional unidirectional exhaust to omnidirectional exhaust, improving exhaust efficiency and thus enhancing exhaust gas treatment efficiency. The spherical structure provided in this application can reduce exhaust back pressure to below 25 kPa, which is approximately 30% lower than other encapsulation structures, resulting in a 2% reduction in cycle fuel consumption.

[0022] Furthermore, the treatment layer comprises, from the inside out, a diesel oxidation catalyst layer 5, a diesel particulate filter layer 6, and a selective catalytic reduction layer 7. The diesel oxidation catalyst layer 5 oxidizes gaseous carbon monoxide, hydrocarbons, and soluble organic matter in the particulate matter of the exhaust gas into carbon dioxide and water, reducing harmful substances in the exhaust. The diesel particulate filter layer effectively reduces particulate emissions from diesel engine exhaust, lowering air pollution levels. The selective catalytic reduction layer 7 uses a reducing agent, such as uric acid, to convert nitrogen oxides into nitrogen and water under the action of a catalyst, thereby reducing the nitrogen oxide content in the exhaust. Through these three treatment layers, harmful substances and particles in the exhaust gas are removed and purified. The structure described in this application arranges each treatment layer in a spherical, layered manner, increasing the exhaust gas treatment speed.

[0023] Furthermore, the spherical air inlet chamber 4 is provided with vent holes. These vent holes allow the exhaust gas to diffuse outwards into the treatment layer for processing.

[0024] Furthermore, a gap is left between the outermost processing layer and the inner wall of the processing tank 3.

[0025] Furthermore, adjacent processing layers are separated by a mesh 8. The mesh 8 separates the different processing layers while allowing exhaust gas to pass through the processing layers normally.

[0026] Furthermore, the diesel oxidation catalyst layer 5 is arranged in a spherical shape.

[0027] Furthermore, the diesel particulate filter layer 6 is spherically shaped and is wrapped around the outside of the diesel oxidation catalyst layer 5.

[0028] Furthermore, the selective catalytic reduction layer 7 is spherically shaped and is wrapped around the outside of the diesel particulate filter layer 6.

[0029] Other techniques in this embodiment are based on existing technologies.

[0030] This utility model has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. This utility model is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims of this application are all within the protection scope of this utility model.

Claims

1. A low exhaust back pressure catalytic converter muffler, characterized in that: It includes an intake pipe (1), an exhaust pipe (2), and a processing tank (3) located between the exhaust pipe (2) and the intake pipe (1). The processing tank (3) has a spherical structure. A spherical intake cavity (4) is located at the center of the processor. Multiple processing layers are arranged in sequence outside the spherical intake cavity (4). The intake pipe (1) passes through the processing tank (3), and the processing layers are connected to the intake cavity. The exhaust pipe (2) is connected to the processing tank (3).

2. The low exhaust back pressure catalytic converter according to claim 1, characterized in that: The treatment layer includes a diesel oxidation catalyst layer (5), a diesel particulate filter layer (6), and a selective catalytic reduction layer (7) arranged sequentially from the inside out.

3. The low exhaust back pressure catalytic converter according to claim 1, characterized in that: The spherical air inlet cavity (4) is provided with a vent hole.

4. A low exhaust back pressure catalytic converter according to claim 1, characterized in that: There is a gap between the outermost processing layer and the inner wall of the processing tank (3).

5. A low exhaust back pressure catalytic converter according to claim 1, characterized in that: Adjacent processing layers are separated by a mesh (8).

6. A low exhaust back pressure catalytic converter according to claim 2, characterized in that: The diesel oxidation catalyst layer (5) is arranged in a spherical shape.

7. A low exhaust back pressure catalytic converter according to claim 2, characterized in that: The diesel particulate filter layer (6) is spherically shaped and is wrapped around the diesel oxidation catalyst layer (5).

8. A low exhaust back pressure catalytic converter according to claim 2, characterized in that: The selective catalytic reduction layer (7) is spherically shaped and is wrapped around the outside of the diesel particulate filter layer (6).

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