Catalyst double-parallel post-processing packaging structure

Abstract

The utility model provides a catalyst double-parallel post-processing packaging structure which comprises a flow dividing cavity. The air inlet and outlet opening is connected to one end of the flow dividing cavity, the air inlet and outlet opening comprises a guide pipe and through grooves, the guide pipe is connected to one end of the flow dividing cavity, and the through grooves are formed in the side wall of one end of the guide pipe at equal intervals; the side wall of the other end of the flow dividing cavity is connected with the two DOC assemblies; the number of the connecting pipes is multiple, and the DPF assembly is connected to one end of the DOC assembly through the connecting pipes; the side walls of the two ends of the mixing cavity are connected with the two DPF assemblies and the two SCR assemblies through the connecting pipes correspondingly, and a urea nozzle is arranged on the side wall of the mixing cavity; the catalyst double-parallel post-processing packaging structure has the advantages of being small in occupied space, convenient to disassemble, small in exhaust back pressure, high in conversion efficiency, small in oil consumption and low in cost.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas aftertreatment, in particular to a catalyst double-parallel aftertreatment packaging structure. Background Technique

[0002] The function of a catalytic converter is to convert the harmful gas emissions contained in the combustion exhaust gas generated during the operation of an engine, mainly referring to hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOx) in the exhaust gas, into emissions harmless to the human social environment, such as carbon dioxide (CO2), water vapor (H2O), and nitrogen (N2).

[0003] The diesel vehicle exhaust aftertreatment device refers to the main part of the exhaust aftertreatment device, which is the main place where chemical or physical effects occur on exhaust pollutants in space, and usually includes parts such as a carrier, a housing, a cushion layer, inlet and outlet pipelines, a mixer, a muffler, etc.

[0004] Currently, the maximum outer diameter of the carrier used in the commonly used carrier series connection structure for aftertreatment is 13 inches. The 13-inch carrier diameter has reached the current industry production limit. To match larger displacement models, it is necessary to increase the carrier diameter. The difficulty faced in continuing to increase the carrier diameter is that it is not easy to form and the consistency is not convenient to control; the existing carrier series connection structure for aftertreatment has a large occupied space, is not convenient to disassemble, has a large exhaust back pressure, low conversion efficiency, high fuel consumption, and high cost.

[0005] Therefore, it is necessary to provide a new catalyst double-parallel aftertreatment packaging structure to solve the above technical problems. Content of the Utility Model

[0006] The technical problem solved by the utility model is to provide a catalyst double-parallel aftertreatment packaging structure that is convenient for reducing the occupied space, convenient for disassembly, has a small exhaust back pressure, high conversion efficiency, low fuel consumption, and low cost.

[0007] To solve the above technical problems, the catalyst double-parallel post-treatment packaging structure provided by the present utility model includes: a shunt chamber; an air inlet and outlet, the air inlet and outlet being connected to one end of the shunt chamber, the air inlet and outlet including a conduit and a through groove, the conduit being connected to one end of the shunt chamber, and the through grooves being equidistantly arranged on the side wall of one end of the conduit; a DOC assembly, two DOC assemblies being connected to the side wall of the other end of the shunt chamber; connecting pipes, there being multiple connecting pipes, and the multiple connecting pipes being respectively connected to the side walls at the inlets and outlets of the DOC assembly, DPF assembly, mixing chamber and SCR assembly, and the DPF assembly being connected to one end of the DOC assembly through the connecting pipe; the side wall of one end of the mixing chamber being connected to two SCR assemblies, and one end of the two SCR assemblies being connected to another group of shunt chambers, and another group of air inlet and outlet being provided on the side wall of this shunt chamber, and temperature sensors, differential pressure sensors and nitrogen oxide sensors being respectively and sequentially connected to the side walls of the DOC assembly, the DPF assembly and the SCR assembly; a mixing chamber, the side walls at both ends of the mixing chamber being respectively connected to two DPF assemblies and SCR assemblies through the connecting pipes, and a urea nozzle being provided on the side wall of the mixing chamber.

[0008] Preferably, the space at the upper and lower ends of the shunt chamber is separated by the conduit, and one end of the conduit is communicated with the upper and lower internal spaces of the shunt chamber through the through groove provided on the side wall.

[0009] Preferably, the connecting pipe includes a communicating pipe and a hump, the communicating pipes are respectively connected to the side walls of the DOC assembly, the DPF assembly, the SCR assembly and the mixing chamber, and the DOC assembly, the DPF assembly, the SCR assembly and the mixing chamber are all in contact connection through two communicating pipes, and a sealing gasket is provided at the contact point of the two communicating pipes, and the sealing gasket seals the gap between the two communicating pipes.

[0010] Preferably, the connection point of the two communicating pipes is fixed by a clamp, and a groove is provided on the inner side wall of the clamp, and the clamp is clamped to the side wall of the hump through the groove.

[0011] Preferably, the shunt chamber at the right end evenly divides the incoming gas into two parts and enters the DOC assembly, forming a dual-channel air flow.

[0012] Preferably, the gas outlet end of the mixing chamber is communicated with the SCR assembly, and the gas is again divided into two parts and enters the SCR assembly, and the gas outlet ends of the two SCR assemblies are again joined through the shunt chamber at the left end and connected to the air inlet and outlet.

[0013] Compared with the related art, the catalyst double-parallel post-treatment packaging structure provided by the present utility model has the following beneficial effects:

[0014] The utility model provides a catalyst dual-parallel post-processing packaging structure, the diversion chamber installed at the right end of the device can appropriately increase the uniformity of the airflow on the catalyst end face in the DOC assembly, thereby improving the catalytic performance and effect of the catalyst; and the pipe connection method adopts the commonly used clamp connection, and the sealing gasket clamped therebetween can effectively seal the pipe connection node, and under the fixation of the clamp, the position of the sealing gasket will not be offset, and it is sealed and firm, which is more convenient for the subsequent disassembly and maintenance of the DPF assembly; the installation of the dual-parallel structure can ensure the conversion efficiency of the catalyst, while also reducing the overall back pressure and nitrogen oxide emissions, avoiding the risk of difficulty in making large carriers, and cleverly using a parallel diversion structure to ensure the volume required by the entire catalyst; making the overall structure simple, low-cost, easy to install, and ensuring good consistency in post-processing production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of a preferred embodiment of a catalyst dual-parallel post-processing packaging structure provided by the present invention;

[0016] Figure 2 for Figure 1 The schematic diagram of the structure of the hump limit of the pipe is shown;

[0017] Figure 3 for Figure 1 The schematic diagram of the structure of the intake flow processing is shown;

[0018] Figure 4 for Figure 1 Schematic diagram of the structure of the clamp shown.

[0019] Numbers in the figure: 1. diverter chamber, 2. air inlet and outlet, 21. conduit, 22. through groove, 3. DOC assembly, 4. DPF assembly, 5. mixing chamber, 6. SCR assembly, 7. clamp, 8. connecting pipe, 81. connecting pipe, 82. hump, 9. sealing gasket, 10. urea nozzle, 11. temperature sensor, 12. differential pressure sensor, 13. nitrogen oxides sensor. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings and implementation examples.

[0021] See also Figures 1 to 4 , Figure 1 A schematic structural diagram of a preferred embodiment of a catalyst dual-parallel post-processing packaging structure provided by the present invention; Figure 2 for Figure 1 The schematic diagram of the structure of the hump limit of the pipe is shown; Figure 3 for Figure 1Schematic structural diagram of the intake air flow treatment shown Figure 4 is Figure 1 Schematic structural diagram of the shown clamp. The catalyst dual parallel post-treatment encapsulation structure includes: a shunt chamber 1; an air inlet / outlet 2, the air inlet / outlet 2 is connected to one end of the shunt chamber 1, the air inlet / outlet 2 includes a conduit 21 and a through groove 22, the conduit 21 is connected to one end of the shunt chamber 1, and the through groove 22 is equidistantly arranged on the side wall of one end of the conduit 21; a DOC assembly 3, two DOC assemblies 3 are connected to the side wall of the other end of the shunt chamber 1; a connecting pipe 8, there are multiple connecting pipes 8, and the multiple connecting pipes 8 are respectively connected to the side walls at the inlets and outlets of the DOC assembly 3, the DPF assembly 4, the mixing chamber 5 and the SCR assembly 6, and the DPF assembly 4 is connected to one end of the DOC assembly 3 through the connecting pipe 8; one end of the side wall of the mixing chamber 5 is connected to two SCR assemblies 6, and one end of the two SCR assemblies 6 is connected to another group of shunt chambers 1, and another group of air inlet / outlets 2 are also provided on the side wall of this shunt chamber 1, and temperature sensors 11, differential pressure sensors 12 and nitrogen oxide sensors 13 are respectively and sequentially connected to the side walls of the DOC assembly 3, the DPF assembly 4 and the SCR assembly 6; a mixing chamber 5, both ends of the side wall of the mixing chamber 5 are respectively connected to two DPF assemblies 4 and SCR assemblies 6 through the connecting pipe 8, and a urea nozzle 10 is provided on the side wall of the mixing chamber 5.

[0022] In the specific implementation process, such as Figure 1 and Figure 3 shown, the space at the upper and lower ends of the shunt chamber 1 is separated by the conduit 21, and one end of the conduit 21 is communicated with the upper and lower internal spaces of the shunt chamber 1 through the through groove 22 provided on the side wall; it is convenient to evenly divide the gas into two parts through the conduit 21 and introduce them into the interior of the shunt chamber 1, and then the shunt chamber 1 transports an equal amount of gas into the interior of the DOC assembly 3.

[0023] In the specific implementation process, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the connecting pipe 8 includes a communicating pipe 81 and a hump 82. The communicating pipe 81 is respectively connected to the side walls of the DOC assembly 3, the DPF assembly 4, the SCR assembly 6 and the mixing chamber 5. The DOC assembly 3, the DPF assembly 4, the SCR assembly 6 and the mixing chamber 5 are in contact and connected through two communicating pipes 81. A gasket 9 is provided at the contact point of the two communicating pipes 81, and the gasket 9 seals the gap between the two communicating pipes 81. The connection point of the two communicating pipes 81 is fixed by a clamp 7. The inner side wall of the clamp 7 has a groove, and the clamp 7 is clamped to the side wall of the hump 82 through the groove. The gasket 9 can seal the connection node between the connecting pipes 8, so that gas will not leak. At the same time, through the clamp 7, the two connecting pipes 8 can be connected and fixed together, which is convenient for realizing the connection between various components.

[0024] In the specific implementation process, as Figure 1 and Figure 3 shown, the shunt chamber 1 at the right end evenly divides the incoming gas into two parts and enters the DOC assembly 3, forming a dual-channel air flow. The outlet end of the mixing chamber 5 is connected to the SCR assembly 6, and the gas is divided into two parts again and enters the SCR assembly 6. The outlet ends of the two SCR assemblies 6 are joined and connected to the air inlet / outlet 2 through the shunt chamber 1 at the left end. It is convenient to converge the shunted gas through the mixing chamber 5. After introducing urea through the urea nozzle 10, the gas in the mixing chamber 5 reacts with urea. Then, the reacted gas is shunted through the connecting pipe 8 and introduced into the SCR assembly 6 for final treatment, and then discharged.

[0025] The working principle of the catalyst dual-parallel post-treatment packaging structure provided by the present utility model is as follows:

[0026] During use, first, the DOC assembly 3, the DPF assembly 4, the mixing chamber 5, and the SCR assembly 6 are sequentially connected together from right to left through multiple connecting pipes 81, so that the DOC assembly 3, the DPF assembly 4, the mixing chamber 5, and the SCR assembly 6 are all connected through the connecting pipes 81. One end of the DOC assembly 3 at the rightmost end is connected to the shunt chamber 1, and one end of the SCR assembly 6 at the leftmost end is connected to another shunt chamber 1. The air inlet and outlet 2 is provided at the central position of the side wall at one end of the two shunt chambers 1. It is connected to the tail pipe through the conduit 21 at the rightmost end, so that the tail gas can be evenly divided into two parts through the conduit 21 and the through groove 22 provided on its side wall and enter the internal spaces at the upper and lower ends of the shunt chamber 1, and then flow into the DOC assembly 3 for preliminary catalysis. The gas catalyzed by the DOC assembly 3 enters the DPF assembly 4 under the guidance of the connecting pipe 81, so that the DPF assembly 4 filters the gas. Then, the filtered gas in the two DPF assemblies 4 enters the mixing chamber 5 to converge. Then, urea is added into the mixing chamber 5 through the urea nozzle 10, so that the urea reacts with the gas. Then, the gas is guided into the SCR assembly 6 through the connecting pipe 81, so that the NSCR assembly 6 further processes the incoming gas to make the gas become harmless gas. Then, the gas processed by the two SCR assemblies 6 is converged by the shunt chamber 1 at the left end and discharged through the conduit 21 at the left end.

[0027] Compared with the related technology, the catalyst dual-parallel post-treatment packaging structure provided by the present invention has the following beneficial effects:

[0028] The present invention provides a catalyst dual-parallel post-treatment packaging structure. The shunt chamber 1 installed at the right end of the device can appropriately increase the uniformity of the airflow on the catalyst end face in the DOC assembly 3, improving the catalytic performance and effect of the catalyst. The connection method of the connecting pipe 8 uses the commonly used clamp 7. The gasket 9 clamped between them can effectively seal the connection node of the connecting pipe 8. Under the fixation of the clamp 7, the position of the gasket 9 will not shift, and it is sealed and firm, which is more convenient for the subsequent disassembly and maintenance of the DPF assembly 4. The installation of the dual-parallel structure can not only ensure the conversion efficiency of the catalytic converter, but also reduce the overall back pressure and nitrogen oxide emissions, avoiding the risk of difficult production of large carriers. It cleverly uses the parallel shunt structure to ensure the volume required for the entire catalyst. The overall structure is simple, the cost is low, it is convenient to install, and the post-treatment production consistency is well guaranteed.

[0029] The above are only embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, are similarly included within the patent protection scope of the present utility model.

Claims

1. A catalyst dual parallel post-processing packaging structure, characterized in that: include; Diversion cavity (1); An air inlet and outlet (2), the air inlet and outlet (2) being connected to one end of the diversion chamber (1), the air inlet and outlet (2) comprising a conduit (21) and a through groove (22), the conduit (21) being connected to one end of the diversion chamber (1), the through groove (22) being equidistantly arranged on a side wall of one end of the conduit (21); DOC assembly (3), two DOC assemblies (3) are connected to the other side wall of the diversion chamber (1); A pipe (8), wherein a plurality of pipes (8) are provided, and the plurality of pipes (8) are respectively connected to the side walls of the inlet and outlet of the DOC assembly (3), the DPF assembly (4), the mixing chamber (5) and the SCR assembly (6), and the DPF assembly (4) is connected to one end of the DOC assembly (3) through the pipe (8); the side wall of one end of the mixing chamber (5) is connected to two SCR assemblies (6), and one end of the two SCR assemblies (6) is connected to another group of the diversion chambers (1), and the side wall of the diversion chamber (1) is also provided with another group of the air inlet and outlet (2), and the side walls of the DOC assembly (3), the DPF assembly (4) and the SCR assembly (6) are respectively and sequentially connected to the temperature sensor (11), the pressure difference sensor (12) and the nitrogen oxide sensor (13); A mixing chamber (5), wherein the side walls at both ends of the mixing chamber (5) are connected to the two DPF assemblies (4) and the SCR assembly (6) via the connecting pipes (8), and a urea nozzle (10) is provided on the side wall of the mixing chamber (5).

2. The catalyst dual-parallel post-processing packaging structure according to claim 1, characterized in that: The spaces at the upper and lower ends of the diversion chamber (1) are separated by the conduit (21), and one end of the conduit (21) is connected to the upper and lower internal spaces of the diversion chamber (1) through the through groove (22) provided on the side wall.

3. The catalyst dual-parallel post-processing packaging structure according to claim 1, characterized in that: The connecting pipe (8) includes a connecting pipe (81) and a hump (82), wherein the connecting pipe (81) is respectively connected to the side wall of the DOC assembly (3), the DPF assembly (4), the SCR assembly (6) and the mixing chamber (5), and the DOC assembly (3), the DPF assembly (4), the SCR assembly (6) and the mixing chamber (5) are all connected by the two connecting pipes (81) in abutting manner, and a sealing gasket (9) is provided at the contact point of the two connecting pipes (81), and the sealing gasket (9) seals the gap between the two connecting pipes (81).

4. The catalyst dual-parallel post-processing packaging structure according to claim 3, characterized in that: The connection point of the two connecting pipes (81) is fixed by a clamp (7), and the inner side wall of the clamp (7) is provided with a groove, and the clamp (7) is engaged with the side wall of the hump (82) through the groove.

5. The catalyst dual-parallel post-processing packaging structure according to claim 1, characterized in that: The diversion chamber (1) located at the right end evenly divides the incoming gas into two parts that enter the DOC assembly (3), forming a dual-channel airflow.

6. The catalyst dual-parallel post-processing packaging structure according to claim 1, characterized in that: The gas outlet of the mixing chamber (5) is connected to the SCR assembly (6), and the gas is divided into two parts again and enters the interior of the SCR assembly (6), and the two gas outlets of the SCR assembly (6) are merged again through the diversion chamber (1) at the left end to connect to the gas inlet and outlet (2).

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