Silencer with tail gas purification device

Abstract

The utility model discloses a silencer with a tail gas purification device, which belongs to the technical field of excavator tail gas treatment and comprises a barrel, and end plates are arranged at two ends of the barrel to seal the barrel. A partition plate and a DOC unit are arranged in the barrel in the radial direction, the interior of the barrel is sequentially divided into a first area, a second area and a third area by the DOC unit and the partition plate, a silencing pipe is further arranged in the barrel in the axial direction and penetrates through the DOC unit and the partition plate, and a plurality of holes are formed in the outer wall, corresponding to the first area and the third area, of the silencing pipe. An air inlet is formed in the side wall of the barrel corresponding to the second area, and an exhaust tail pipe is fixedly arranged at the top of the barrel corresponding to the third area.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment of excavators, and in particular relates to a muffler with a tail gas purification device. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] At present, excavators as non-road machinery often need to operate at high power, which will produce a large amount of exhaust gas. The concentrations of carbon monoxide and nitrogen monoxide in these exhaust gases are relatively high. Direct emissions will pollute the environment and threaten the lives and safety of operators.

[0004] Existing exhaust gas treatment devices generally use air filters to treat the exhaust gas generated by excavators, but they cannot remove or reduce the concentration of carbon monoxide and nitrogen monoxide, and cannot meet emission requirements. In addition, the existing exhaust gas treatment devices generate relatively large noise during the treatment process, causing noise pollution. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a muffler with an exhaust gas purification device, which is provided with a DOC unit to oxidize carbon monoxide and nitric oxide in the exhaust gas into carbon dioxide and nitrogen dioxide, thereby reducing the emission concentration of harmful gases.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] In the first aspect, the utility model provides a silencer with an exhaust gas purification device, including a cylinder, end plates are arranged at both ends of the cylinder to close the cylinder; partitions and DOC units are arranged radially inside the cylinder, the DOC unit and the partition divide the inside of the cylinder into a first area, a second area and a third area in sequence, and a silencer pipe is also arranged axially inside the cylinder, the silencer pipe passes through the DOC unit and the partition, a plurality of openings are arranged on the outer wall of the silencer pipe corresponding to the first area and the third area, an air inlet is arranged on the side wall of the cylinder corresponding to the second area, and an exhaust tail pipe is fixedly arranged on the top of the cylinder corresponding to the third area.

[0008] As a further technical solution, the DOC unit is provided with a plurality of through holes along the axial direction of the cylinder, and an oxidation catalyst is arranged in the DOC unit.

[0009] As a further technical solution, there is a set distance between the DOC unit and the partition, and there is a distance between the DOC unit, the partition and the end plate.

[0010] As a further technical solution, both ends of the silencer pipe extend to the side of the end plate, and the silencer pipe runs through the first area, the second area and the third area.

[0011] As a further technical solution, no opening is provided on the outer wall of the silencer pipe corresponding to the second area.

[0012] As a further technical solution, an air pipe is arranged inside the cylinder corresponding to the third area, and the air pipe is fixedly connected to the exhaust tail pipe.

[0013] As a further technical solution, the air pipe is arranged radially along the cylinder body, and the air pipe extends downward from the top wall to the bottom wall inside the cylinder body.

[0014] As a further technical solution, a plurality of exhaust holes are provided on the periphery of the trachea.

[0015] As a further technical solution, two silencer pipes are provided, and the two silencer pipes are provided corresponding to the two sides of the trachea.

[0016] As a further technical solution, the axis of the cylinder is arranged horizontally, the silencer pipe, the partition and the DOC unit are all welded and fixed, and the partition and the DOC unit are all welded and fixed to the inner wall of the cylinder.

[0017] The beneficial effects of the above utility model are as follows:

[0018] The muffler with exhaust gas purification device of the utility model can be installed at the exhaust gas discharge of the excavator. The exhaust gas can enter the cylinder through the air inlet, and then pass through the DOC unit to oxidize the exhaust gas, and the treated exhaust gas is discharged through the muffler and the exhaust tail pipe. In this process, carbon monoxide and nitrogen monoxide in the exhaust gas can be oxidized into carbon dioxide and nitrogen dioxide, thereby reducing the concentration of harmful gas emissions, so that the exhaust gas emissions of the excavator meet the requirements.

[0019] The muffler with exhaust gas purification device of the utility model has a cylinder body divided into multiple areas by a DOC unit and a partition, and the opening positions of the air inlet, the exhaust tail pipe and the muffler are coordinated and arranged so that the exhaust gas flows in a certain path to ensure its oxidation treatment effect. At the same time, the muffler can also reduce the noise pollution caused by the exhaust gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 is a schematic diagram of a muffler with an exhaust gas purification device according to one or more embodiments of the present utility model;

[0022] Figure 2 This is another schematic diagram of a muffler with an exhaust gas purification device according to one or more embodiments of the present invention (the cylinder is not shown);

[0023] Figure 3 is a cross-sectional view of a muffler with an exhaust gas purification device according to one or more embodiments of the present invention;

[0024] In the figure: 1. cylinder, 2. air inlet, 3. exhaust tail pipe, 4. DOC unit, 5. end plate, 6. partition, 7. muffler, 8. air pipe, 9. exhaust hole, 10. opening, 11. through hole.

[0025] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations;

[0028] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0029] Terminology explanation section: If the terms "install", "connect", "connect", "fixed" and so on appear in the present invention, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements, or an interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0030] In a typical implementation of the present invention, Figure 1 As shown, a muffler with an exhaust gas purification device is proposed, which includes a cylinder 1, an air inlet 2 is provided on the side wall of the cylinder 1, and an exhaust tail pipe 3 is fixedly arranged on the top of one end of the cylinder 1.

[0031] The cylinder 1 is hollow and has an internal space. The axis of the cylinder 1 is horizontally arranged. End plates 5 are arranged at both ends of the cylinder 1 to close the cylinder. It can be understood that the end plates 5 are arranged along the radial direction of the cylinder 1.

[0032] A DOC unit 4, a partition 6 and a silencer 7 are arranged in the cylinder 1, wherein the DOC unit 4 and the partition 6 are arranged radially along the cylinder 1, and there is a set distance between the DOC unit 4 and the partition 6, and there is also a certain distance between the DOC unit 4, the partition 6 and the end plate at the end of the cylinder. The DOC unit 4 and the partition 6 divide the interior of the cylinder 1 into three areas, namely: a first area between the DOC unit 4 and one of the end plates 5, a second area between the DOC unit 4 and the partition 6, and a third area between the partition 6 and the other end plate 5.

[0033] The silencer pipe 7 is arranged horizontally, that is, the axis of the silencer pipe 7 and the cylinder body 1 are parallel; the silencer pipe 7 passes through the DOC unit 4 and the partition 6, and both ends of the silencer pipe 7 extend to the side of the end plate, and the silencer pipe 7 passes through the first area, the second area and the third area.

[0034] The air inlet 2 is arranged in the second area between the partition 6 and the DOC unit 4, the exhaust tail pipe 3 is fixed to the top of the cylinder 1 in the third area, and the air pipe 8 is arranged inside the third area of ​​the cylinder 1, and the air pipe 8 is fixedly connected to the exhaust tail pipe 3.

[0035] In a further solution, the air pipe 8 is arranged radially along the cylinder 1 , and the air pipe 8 extends downward from the top wall inside the cylinder 1 to the bottom wall, and a plurality of exhaust holes 9 are opened on the outer periphery of the air pipe 8 .

[0036] The outer wall of the silencer pipe 7 corresponding to the first area and the third area is provided with a plurality of openings 10, while the outer wall of the silencer pipe corresponding to the second area is not provided with any openings, and the silencer pipe in the second area is in the form of a closed pipe.

[0037] The DOC unit 4 is provided with a through hole 11 along the axial direction of the cylinder 1 . A plurality of through holes 11 are provided in the DOC unit 4 . The plurality of through holes 11 can be provided in the DOC unit 4 in an array form to allow airflow to pass through.

[0038] The DOC unit 4 adopts an existing oxidation catalyst, in which an oxidation catalyst is placed. When the exhaust gas passes through, the carbon monoxide and nitrogen monoxide in the exhaust gas are oxidized into carbon dioxide and nitrogen dioxide, thereby reducing the emission concentration of harmful gases.

[0039] In an optional implementation scheme, the silencer pipe 7 is made of a steel pipe, and multiple silencer pipes 7 can be provided. In the present embodiment, two silencer pipes 7 are provided, and the two silencer pipes 7 are provided corresponding to the two sides of the air pipe 8, which can increase the rate of airflow passing through.

[0040] In an optional implementation manner, the silencer pipe, the partition and the DOC unit are all welded and fixed, the partition and the DOC unit are all welded and fixed to the inner wall of the cylinder, and the exhaust tail pipe and the air pipe are all welded and fixed to the cylinder.

[0041] The working principle of the muffler is:

[0042] The exhaust gas enters the cylinder 1 through the air inlet 2. At this time, the exhaust gas enters the second area of ​​the cylinder 1. Due to the obstruction of the partition 6, the exhaust gas will not flow directly to the third area, but will flow to the first area through the through hole 11 of the DOC unit 4. In the process of passing through the DOC unit 4, the carbon monoxide in the exhaust gas is oxidized to carbon dioxide, and the nitrogen monoxide is oxidized to nitrogen dioxide. After that, the exhaust gas enters the first area and enters the muffler 7 through the opening 10, flows to the third area through the muffler 7, and then enters the air pipe 8 through the exhaust hole 9, and is discharged through the exhaust tail pipe 3.

[0043] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A muffler with an exhaust gas purification device, characterized in that: It includes a cylinder body, and end plates are arranged at both ends of the cylinder body to close the cylinder body; partitions and DOC units are arranged radially inside the cylinder body, and the DOC unit and the partition divide the inside of the cylinder body into a first area, a second area and a third area in sequence; a silencer is also arranged axially inside the cylinder body, and the silencer passes through the DOC unit and the partition; a plurality of openings are arranged on the outer wall of the silencer corresponding to the first area and the third area, an air inlet is arranged on the side wall of the cylinder body corresponding to the second area, and an exhaust tail pipe is fixedly arranged on the top of the cylinder body corresponding to the third area.

2. The muffler with exhaust gas purification device according to claim 1, characterized in that: The DOC unit has a plurality of through holes arranged along the axial direction of the cylinder, and an oxidation catalyst is arranged in the DOC unit.

3. The muffler with exhaust gas purification device according to claim 1, characterized in that: There is a set distance between the DOC unit and the partition plate, and there is a distance between the DOC unit, the partition plate and the end plate.

4. The muffler with exhaust gas purification device according to claim 1, characterized in that: Both ends of the muffler pipe extend to the side of the end plate, and the muffler pipe passes through the first area, the second area and the third area.

5. The muffler with exhaust gas purification device according to claim 1 or 4, characterized in that: The outer wall of the silencer pipe corresponding to the second area is not provided with openings.

6. The muffler with exhaust gas purification device according to claim 1, characterized in that: An air pipe is arranged inside the cylinder corresponding to the third area, and the air pipe is fixedly connected to the exhaust tail pipe.

7. The muffler with exhaust gas purification device according to claim 6, characterized in that: The air pipe is arranged radially along the cylinder body, and the air pipe extends downward from the top wall to the bottom wall in the cylinder body.

8. The muffler with exhaust gas purification device according to claim 6, characterized in that: A plurality of exhaust holes are arranged on the outer periphery of the trachea.

9. The muffler with exhaust gas purification device according to claim 6, characterized in that: Two silencer pipes are provided, and the two silencer pipes are provided corresponding to the two sides of the trachea.

10. The muffler with exhaust gas purification device according to claim 1, characterized in that: The axis of the cylinder is arranged horizontally, the silencer pipe, the partition plate and the DOC unit are all welded and fixed, and the partition plate and the DOC unit are all welded and fixed to the inner wall of the cylinder.

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