DPF carrier anti-displacement structure for compact tail gas treatment device

Abstract

The utility model discloses a DPF carrier anti-displacement structure for a compact tail gas treatment device, and relates to the technical field of diesel engine tail gas after-treatment, the DPF carrier anti-displacement structure comprises a DPF shell and a mixer shell connected with the DPF shell, a DPF carrier is arranged in the DPF shell, a check ring is fixedly arranged in the mixer shell, and the DPF carrier anti-displacement structure is arranged in the mixer shell. The check ring makes contact with the DPF carrier and blocks movement of the DPF carrier. According to the DPF mixer, the check ring making contact with the DPF carrier is arranged in the mixer shell, the DPF carrier is blocked, the DPF carrier is effectively prevented from shifting or disengaging, and therefore the defect that due to the fact that the space, behind the DPF carrier, of a DPF of a compact tail gas processor is not enough to fix a blocking structure, shifting of the DPF carrier is difficult to avoid is overcome.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel engine exhaust post-processing, and in particular to a DPF carrier anti-displacement structure for a compact exhaust gas processing device. Background Art

[0002] The carrier of DPF (diesel particulate filter) in the diesel engine exhaust afterprocessor is prone to displacement or detachment when the DPF is overloaded and the back pressure is too high, relying solely on the wrapping force of the gasket. Since there are many factors that may cause the DPF carrier to shift or detach, the current general treatment measure is to add a baffle or gasket behind the carrier as a block. However, with the current trend of increasing compact exhaust processors, some DPFs are compactly designed, resulting in very small space behind the DPF carrier and an inability to fix the blocking structure. Therefore, the compact DPF carrier still has the risk of displacement or detachment. Utility Model Content

[0003] In view of the deficiencies in the above-mentioned prior art, the utility model provides a DPF carrier anti-displacement structure for a compact exhaust gas treatment device, which is welded and fixed inside the mixer cylinder behind the DPF, and can prevent the compact DPF carrier from shifting or falling out, while reducing assembly deviation and carrier damage.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A DPF carrier anti-displacement structure for a compact exhaust gas treatment device comprises a DPF shell and a mixer shell connected to the DPF shell, wherein a DPF carrier is arranged in the DPF shell, and a retaining ring is fixedly arranged inside the mixer shell, wherein the retaining ring contacts the DPF carrier and blocks the movement of the DPF carrier.

[0006] As a further implementation, the retaining ring is arranged at one end where the mixer housing is connected to the DPF housing.

[0007] As a further implementation, the retaining ring is connected to the inner wall of the mixer housing by welding.

[0008] As a further implementation, the retaining ring includes a circular ring portion and a convex portion formed on the outer ring of the circular ring portion, and the retaining ring is processed in one piece.

[0009] As a further implementation, the convex portion includes a plurality of convex portions, and the plurality of convex portions are evenly distributed along the outer circle of the annular portion.

[0010] As a further implementation, the outer diameter of the annular portion is the same as the inner diameter of the mixer housing, and the inner diameter of the annular portion is smaller than the outer diameter of the DPF carrier, so as to block the DPF carrier and prevent it from shifting or falling out.

[0011] As a further implementation, the retaining ring is fixed inside the mixer housing by welding through the protrusion; and one end of the retaining ring away from the protrusion abuts against the DPF carrier.

[0012] As a further implementation, steel wool is provided between the retaining ring and the DPF carrier, and the steel wool is fixed to the end surface of the retaining ring in contact with the DPF carrier by spot welding to prevent damage to the DPF carrier.

[0013] As a further implementation, the DPF housing and the mixer housing are connected and sealed via a clamp.

[0014] As a further implementation, the retaining ring is made of stainless steel.

[0015] As a further implementation, the retaining ring is provided with a notch to facilitate assembly.

[0016] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0017] 1. The utility model forms a barrier for the DPF carrier by arranging a retaining ring in contact with the DPF carrier inside the mixer housing, thereby effectively preventing the DPF carrier from shifting or falling out, thereby overcoming the defect that the DPF of the compact exhaust gas processor is difficult to avoid the displacement of the DPF carrier due to insufficient space behind the DPF carrier to fix the blocking structure.

[0018] 2. Considering the insufficient space behind the DPF carrier and the difficulty of welding assembly, the retaining ring of the utility model is welded and fixed to the mixer housing through the formed convex portion, and the annular portion abuts against the DPF carrier for blocking. The retaining ring is provided with a notch, which can reduce the difficulty of assembly and ensure that the outer circle of the retaining ring fits with the inner wall of the mixer housing.

[0019] 3. The utility model provides a deformable steel wool between the retaining ring and the DPF carrier to prevent the retaining ring from directly contacting the DPF carrier and causing damage, and at the same time can compensate for assembly deviations. 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 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0023] Figure 3 This is a schematic diagram of the retaining ring structure of the utility model.

[0024] In the figure: 1. DPF housing; 2. DPF carrier; 3. retaining ring; 4. mixer housing; 5. clamp; 6. steel wool; 7. sealing gasket. DETAILED DESCRIPTION

[0025] 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.

[0026] Embodiment 1

[0027] In the field of diesel engine exhaust treatment technology, DPF refers to the diesel engine particulate filter, which is installed after the DOC. Its main function is to capture PM particles. The filtration efficiency of PM can reach more than 98%. As the diesel engine runs longer, the accumulation in the DPF will increase the flow resistance of the exhaust. The DPF carrier generally refers to a wall-flow honeycomb ceramic carrier or a silicon carbide carrier, which is used to reduce pollutants such as PM and PN and is filled inside the DPF.

[0028] In a typical implementation of the present application, Figure 1-3 As shown, a DPF carrier anti-displacement structure for a compact exhaust gas treatment device is provided, comprising a DPF shell 1 and a mixer inner shell connected to the DPF shell, a DPF carrier 2 is arranged in the DPF shell 1, a retaining ring 3 is fixedly arranged at one end of the mixer shell 4 connected to the DPF shell 1, and the outer end of the retaining ring 3 contacts the DPF carrier 2 and blocks the movement of the DPF.

[0029] like Figure 2 As shown, the connection between the DPF housing 1 and the mixer housing 4 is assembled, fixed and sealed by a clamp 5, the interior of the clamp 5 is an "X"-shaped structure, the docking part between the mixer housing 4 and the DFP housing is an "X"-shaped structure, and the docking part of the DPF housing 1 is a conical structure. A conical sealing gasket 7 is provided between the conical structure of the DPF housing and the "X"-shaped structure of the mixer, and finally the clamp is used to tighten and seal.

[0030] The outer wall of the retaining ring 3 is fitted with the inner wall of the mixer housing 4. Specifically, the retaining ring 3 includes a circular ring portion and a plurality of convex portions formed on the outer side of the circular ring portion. The plurality of convex portions are evenly distributed along the outer circle of the circular ring portion, and the circular ring portion and the convex portions are processed as one piece. The outer diameter of the circular ring portion is the same as the inner diameter of the mixer housing 4, and the inner diameter of the circular ring portion is smaller than the outer diameter of the DPF carrier 2; the convex portion of the retaining ring 3 is welded to the inner wall of the mixer housing 4, and the side of the retaining ring 3 away from the convex portion abuts against the DPF carrier 2, forming a barrier to the DPF carrier 2, which can effectively prevent the DPF carrier 2 from shifting or falling out. The retaining ring 3 is made of stainless steel to avoid being corroded by high-temperature exhaust gas and to increase the life of the exhaust gas treatment device.

[0031] like Figure 3 As shown, the retaining ring 3 forms 6 evenly distributed convex parts on the outer circumference of the annular part, and forms 6 welding positions with the inner wall of the mixer housing 4, so as to fix the retaining ring 3 in the mixer housing 4. The convex part of the retaining ring 3 is designed to be a quasi-rectangular part along the circumference, which can be closely fitted with the inner wall of the mixer housing, which is conducive to welding and fixing. Of course, in other embodiments, the convex part can also be set to a quasi-trapezoidal, quasi-triangular or other shape, as long as the welding effect is guaranteed. At the same time, considering the installation operation, the retaining ring 3 is provided with a notch, which is conducive to reducing the difficulty of assembly and ensuring that the outer circle of the retaining ring is evenly fitted with the inner wall of the mixer housing, while not affecting the blocking effect of the retaining ring on the DPF carrier.

[0032] Furthermore, steel wool 6 is used for protection between the retaining ring 3 and the DPF carrier 2. The steel wool 6 is spot-welded on the end surface where the retaining ring 3 contacts the DPF carrier 2, which plays a buffering role and prevents the retaining ring from directly contacting the DPF carrier and causing damage to the carrier. At the same time, the deformability of the steel wool can also compensate for the dimensional deviation caused by the assembly of the DPF shell and the mixer, which has better adaptability and ensures the limiting effect of the retaining ring on the DPF carrier.

[0033] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may 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 DPF carrier anti-displacement structure for a compact exhaust gas treatment device, comprising a DPF housing and a mixer housing connected to the DPF housing, characterized in that: A DPF carrier is arranged in the DPF housing, and a retaining ring is fixedly arranged in the mixer housing. The retaining ring contacts the DPF carrier and blocks the movement of the DPF carrier.

2. A DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 1, characterized in that: The retaining ring is arranged at one end where the mixer housing is connected to the DPF housing; the retaining ring is connected to the inner wall of the mixer housing by welding.

3. The DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 1, characterized in that: The retaining ring comprises a circular ring portion and a convex portion formed on the outer ring of the circular ring portion, and the retaining ring is integrally processed.

4. A DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 3, characterized in that: The convex parts include a plurality of convex parts, and the plurality of convex parts are evenly distributed along the outer circle of the annular part.

5. The DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 4, characterized in that: The outer diameter of the annular portion is the same as the inner diameter of the mixer housing, and the inner diameter of the annular portion is smaller than the outer diameter of the DPF carrier.

6. The DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 4, characterized in that: The retaining ring is welded to the inner wall of the mixer housing through the convex portion; and one end of the retaining ring away from the convex portion abuts against the DPF carrier.

7. A DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 6, characterized in that: Steel wool is arranged between the retaining ring and the DPF carrier, and the steel wool is fixed on the end surface of the retaining ring in contact with the DPF carrier by spot welding.

8. The DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 1, characterized in that: The DPF housing and the mixer housing are connected and sealed via a clamp.

9. The DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 1, characterized in that: The retaining ring is made of stainless steel.

10. The DPF carrier anti-displacement structure for a compact exhaust gas treatment device according to claim 1, characterized in that: The retaining ring is provided with a notch.

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