DOC-DPF assembly device

Abstract

The utility model provides a DOC-DPF assembly device which comprises a DOC carrier and a DPF carrier, the DOC carrier is communicated with the DPF carrier through a mixer, the axis of the DOC carrier is perpendicular to the axis of the DPF carrier, one end of the DOC carrier is connected into a fixing shell in a sleeved mode, one end of the fixing shell is connected with one end of the DPF carrier in a sleeved mode, the end, back to the fixing shell, of the DPF carrier is communicated with an air outlet elbow, and the other end of the fixing shell is communicated with an air inlet elbow. The DOC carrier, the DPF carrier and the gas outlet bent pipe are wrapped with a heat preservation shell. According to the DOC-DPF assembly device, the DOC carrier and the DPF carrier are vertically arranged, the space occupied by the DOC-DPF assembly device is reduced, overall arrangement of an engine compartment is facilitated, the heat preservation shell is beneficial for preventing heat loss, the temperature needed by oxidation-reduction reaction is guaranteed, and the DOC-DPF assembly device has good engine aftertreatment efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of diesel exhaust purification, in particular to a DOC-DPF assembly device. Background Art

[0002] Engine aftertreatment is to reduce the emission of harmful substances in automobile exhaust. Its main principle is to add a specific catalyst to the exhaust gas discharged by the engine to convert harmful substances into harmless substances through chemical reactions.

[0003] At present, the most common diesel engine after-treatment structures include DPF, DOC and SCR. DPF is used to reduce fine particulate matter in diesel vehicle exhaust, DOC is used to reduce nitrogen oxide and hydrocarbon emissions in diesel vehicle exhaust, and SCR is used to reduce nitrogen oxide emissions in diesel vehicle exhaust.

[0004] In order to make full use of the engine exhaust temperature and improve the catalytic conversion efficiency of the oxidation catalyst DOC and the particulate filter DPF, the DOC-DPF close-coupled layout has become the mainstream in recent years. That is, the DOC assembly is installed close to the supercharger outlet, and the DPF assembly is close to the DOC assembly. However, due to the limited layout space in the engine compartment, if the DOC and DPF are arranged coaxially or in parallel, there is a high possibility that there will be insufficient layout space. Utility Model Content

[0005] In view of the deficiencies of the prior art, the purpose of the present invention is to provide a DOC-DPF assembly device, aiming to solve the problem that the traditional DOC-DPF arrangement in the prior art occupies a large space.

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

[0007] A DOC-DPF assembly device includes a DOC carrier and a DPF carrier, the DOC carrier is connected to the DPF carrier through a mixer, the axis of the DOC carrier is perpendicular to the axis of the DPF carrier, one end of the DOC carrier is sleeved in a fixed shell, the end of the fixed shell facing away from the DOC carrier is sleeved in one end of the DPF carrier, the end of the DPF carrier facing away from the fixed shell is connected to an air outlet elbow, the mixer is placed in the fixed shell, and the DOC carrier, the DPF carrier and the air outlet elbow are covered with an insulation shell.

[0008] Compared with the prior art, the beneficial effects of the utility model are: by vertically arranging the DOC carrier and the DPF carrier, the space occupied by the DOC-DPF assembly device is reduced, which is beneficial to the overall layout of the engine compartment; the connection between the DOC carrier and the DPF carrier is stabilized by the fixed shell, and the vertical state between the axes of the two is always stably maintained; the insulation shell is beneficial to preventing heat loss and ensuring the temperature required for the redox reaction, so that the DOC-DPF assembly device has good engine after-treatment efficiency.

[0009] Furthermore, the thickness of the insulation shell is 8 mm.

[0010] Furthermore, one end of the DPF carrier close to the mixer is connected to a first differential pressure pipe, and one end of the DPF carrier away from the mixer is connected to a second differential pressure pipe, and both the first differential pressure pipe and the second differential pressure pipe are used to connect a differential pressure sensor.

[0011] Furthermore, a sensor fixing bracket is arranged on the side wall of the DOC carrier, and the sensor fixing bracket is used to fix the differential pressure sensor. A fixing bracket groove is opened on the insulation shell, and the fixing bracket groove corresponds to the position of the sensor fixing bracket. The fixing bracket groove passes through the insulation shell so that the sensor fixing bracket passes through the fixing bracket groove and is placed outside the insulation shell.

[0012] Furthermore, a first through hole and a second through hole are provided on the insulation shell, the first through hole is adapted to the first pressure differential tube, the second through hole is adapted to the second pressure differential tube, and a fixing hole is provided on the fixed shell, the fixing hole passes through the fixed shell, and the fixing hole is adapted to the first pressure differential tube.

[0013] Furthermore, a fixing piece is arranged on the second pressure difference pipe, and the fixing piece is connected to the heat preservation shell.

[0014] Furthermore, the DOC carrier is connected to an intake pipe, an intake flange is arranged at one end of the intake pipe facing away from the DOC carrier, an outlet flange is arranged at one end of the outlet elbow facing away from the DPF carrier, and the outlet flange is connected to the first assembly bracket.

[0015] Furthermore, a second assembly bracket is arranged on the outer side wall of the DPF carrier, an assembly bracket groove is opened on the insulation shell, the assembly bracket groove corresponds to the position of the second assembly bracket, and the assembly bracket groove passes through the insulation shell so that the second assembly bracket passes through the assembly bracket groove and is placed outside the insulation shell.

[0016] Furthermore, a urea nozzle mounting seat is arranged on the fixed shell, and a mounting seat groove is provided in the heat-insulating shell, the mounting seat groove corresponds to the position of the urea nozzle mounting seat, and the mounting seat groove passes through the heat-insulating shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a DOC-DPF assembly device from a first perspective in an embodiment of the utility model;

[0018] Figure 2 This is a schematic structural diagram of the DOC-DPF assembly device from a second viewing angle in an embodiment of the utility model;

[0019] Figure 3 This is a partially disassembled structural diagram of a DOC-DPF assembly device in an embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the disassembled structure of the DOC-DPF assembly device in the embodiment of the utility model;

[0021] Figure 5 It is a partial structural schematic diagram of a DOC carrier and a fixed shell in a DOC-DPF assembly device in an embodiment of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the DOC carrier and the fixed shell in the DOC-DPF assembly device in the embodiment of the utility model.

[0023] Figure 7 This is a schematic structural diagram of the DOC-DPF assembly device from a third viewing angle in an embodiment of the utility model;

[0024] Description of main component symbols:

[0025] DOC carrier 100 Inlet flange 110 Urea nozzle mounting seat 120 Sensor holder 130 DPF carrier 200 The first differential pressure tube 210 Second differential pressure tube 220 Fixings 221 Double tube fixing buckle 222 Single tube fixing buckle 223 Second assembly bracket 230 DPF carrier bracket 240 Fixed shell 300 Supporting Department 310 Connecting ring 320 Insulation shell 400 First through hole 410 Second through hole 420 Bracket slot 430 Carrier bracket slot 440 Fixed bracket slot 450 First escape slot 461 Second escape slot 462 Air outlet elbow 500 Outlet flange 510 First assembly bracket 520

[0026] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] See also Figures 1 to 7 The DOC-DPF assembly device in the embodiment of the utility model includes a DOC carrier 100 and a DPF carrier 200. The DOC carrier 100 is connected to the DPF carrier 200 through a mixer, and the axis of the DOC carrier 100 is perpendicular to the axis of the DPF carrier 200. Preferably, the engine exhaust enters the DOC carrier 100, a catalytic oxidation reaction occurs in the DOC carrier 100, HC, CO, and NO in the exhaust gas are oxidized and continue to move forward to mix with the urea aqueous solution introduced in the mixer to form a mixed gas, the mixed gas passes through the DPF carrier 200, a reduction reaction occurs in the DPF carrier, and large molecular particles and dust in the gas are intercepted by the DPF carrier 200, and the filtered gas passes through the DPF carrier 200 and is discharged to the SCR carrier for the next filtering reaction, and the arrangement between the DOC carrier 100 and the DPF carrier 200 is designed to be vertical in axis, which compresses the size of the assembly. Specifically, compared with the DOC carrier 100 and the DPF carrier 200 both being placed horizontally or vertically, after the axis is placed vertically, the size of the DOC-DPF assembly device is reduced by 50 mm in the horizontal or vertical direction. It can be understood that the space in the engine compartment is saved and the phenomenon of insufficient space for installation and adaptation is avoided.

[0031] One end of the DOC carrier 100 is sleeved in the fixed shell 300, and one end of the fixed shell 300 facing away from the DOC carrier 100 is sleeved in one end of the DPF carrier 200. The mixer is placed in the fixed shell 300, and a urea nozzle mounting seat 120 is provided on the fixed shell 300. Preferably, one end of the DOC carrier 100 passes through the top opening of the fixed shell 300 and abuts against the inner side wall of the fixed shell 300. A supporting portion 310 is provided on the lower half of the top opening to provide support force to the lower half of the side wall of the DOC carrier 100 to enhance the stability of the connection. The fixed shell 300 includes a connecting ring 320, and the connecting ring 320 is used to sleeve the top end of the DPF carrier 200. It can be understood that the fixed shell 300 serves to strengthen the connection between the DOC carrier 100 and the DPF carrier 200, stabilizes the vertical axis connection, and can insulate the reaction occurring in the mixer and the mixed gas, which is beneficial to ensure the temperature required for the redox reaction.

[0032] One end of the DPF carrier 200 close to the mixer is connected to the first pressure differential pipe 210, and one end of the DPF carrier 200 away from the mixer is connected to the second pressure differential pipe 220. The first pressure differential pipe 210 and the second pressure differential pipe 220 are both used to connect a pressure differential sensor. One end of the DPF carrier 200 facing away from the fixed shell 300 is connected to an air outlet elbow 500. An air outlet flange 510 is provided at the end of the air outlet elbow 500 facing away from the DPF carrier 200. The air outlet flange 510 is connected to a first assembly bracket 520. A second assembly bracket 230 is provided on the outer side wall of the DPF carrier 200. Preferably, pressure differential tubes are installed upstream and downstream of the DPF carrier 200 to output the pressure difference at both ends of the DPF carrier 200 to ensure the normal operation of the system. The first pressure differential tube 210 and the second pressure differential tube 220 are connected to a double-tube fixing buckle 222 at one end away from the DPF carrier 200, which is beneficial to maintaining the position of the pressure differential tubes and increasing the structural stability of the assembly. The first pressure differential tube 210 and the second pressure differential tube 220 are also respectively sleeved with a plurality of single-tube fixing buckles 223 at one end away from the DPF carrier 200, so as to facilitate the stable connection of the first pressure differential tube 210 and the second pressure differential tube 220 with the pressure differential sensor.

[0033] The DOC carrier 100 is connected to the intake pipe, and an intake flange 110 is arranged at one end of the intake pipe facing away from the DOC carrier 100. A sensor fixing frame 130 is arranged on the side wall of the DOC carrier 100. The sensor fixing frame 130 is used to fix the differential pressure sensor. Preferably, the intake flange 110 is connected to the outlet of the engine supercharger.

[0034] The DOC carrier 100, the DPF carrier 200 and the outlet elbow 500 are covered with an insulation shell 400, the insulation shell 400 has a thickness of 8 mm, a mounting seat groove is provided in the insulation shell 400, the mounting seat groove corresponds to the position of the urea nozzle mounting seat 120, the mounting seat groove passes through the insulation shell 400, a first through hole 410 and a second through hole 420 are provided on the insulation shell 400, the first through hole 410 is adapted to the first pressure differential tube 210, and the second through hole 420 is adapted to the second pressure differential tube 220, a fixing hole is provided on the fixing shell 300, the fixing hole passes through the fixing shell 300, the fixing hole is adapted to the first pressure differential tube 210, and the second pressure differential tube A fixing piece 221 is provided on 220, and the fixing piece 221 is connected to the insulation shell 400. A fixing frame groove 450 is provided on the insulation shell 400, and the fixing frame groove 450 corresponds to the position of the sensor fixing frame 130. The fixing frame groove 450 passes through the insulation shell 400 so that the sensor fixing frame 130 passes through the fixing frame groove 450 and is placed outside the insulation shell 400. An assembly bracket groove 430 is provided on the insulation shell 400, and the assembly bracket groove 430 corresponds to the position of the second assembly bracket 230. The assembly bracket groove 430 passes through the insulation shell 400 so that the second assembly bracket 230 passes through the assembly bracket groove 430 and is placed outside the insulation shell 400. Preferably, the outer wall of the DPF carrier 200 is further provided with a DPF carrier bracket 240 to fix the DPF carrier 200, and the thermal insulation shell 400 is provided with a carrier bracket groove 440, the carrier bracket groove 440 corresponds to the position of the DPF carrier bracket 240, and the carrier bracket groove 440 penetrates the thermal insulation shell 400, see Figure 7 The bottom of the thermal insulation shell 400 is provided with a first air avoidance groove 461 and a second air avoidance groove 462 to avoid other components in the engine compartment. It can be understood that the arrangement of the DOC-DPF assembly device has high space utilization and is easy to install. By providing the thermal insulation shell 400, the temperature of the redox reaction is guaranteed, the heat dissipation of the system is reduced, and it is beneficial to improve the efficiency of the engine post-processing.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A DOC-DPF assembly device, characterized in that: It includes a DOC carrier and a DPF carrier, the DOC carrier is connected to the DPF carrier through a mixer, the axis of the DOC carrier is perpendicular to the axis of the DPF carrier, one end of the DOC carrier is sleeved in a fixed shell, the end of the fixed shell facing away from the DOC carrier is sleeved on one end of the DPF carrier, the end of the DPF carrier facing away from the fixed shell is connected to an air outlet elbow, the mixer is placed in the fixed shell, and the DOC carrier, the DPF carrier and the air outlet elbow are covered with an insulation shell.

2. The DOC-DPF assembly device according to claim 1, characterized in that: The thickness of the insulation shell is 8 mm.

3. The DOC-DPF assembly device according to claim 1, characterized in that: One end of the DPF carrier close to the mixer is connected to a first differential pressure pipe, and one end of the DPF carrier away from the mixer is connected to a second differential pressure pipe. Both the first differential pressure pipe and the second differential pressure pipe are used to connect a differential pressure sensor.

4. The DOC-DPF assembly device according to claim 3, characterized in that: A sensor fixing frame is arranged on the side wall of the DOC carrier, and the sensor fixing frame is used to fix the differential pressure sensor. A fixing frame groove is opened on the insulation shell, and the fixing frame groove corresponds to the position of the sensor fixing frame. The fixing frame groove passes through the insulation shell so that the sensor fixing frame passes through the fixing frame groove and is placed outside the insulation shell.

5. The DOC-DPF assembly device according to claim 4, characterized in that: The insulation shell is provided with a first through hole and a second through hole, the first through hole is adapted to the first pressure differential tube, the second through hole is adapted to the second pressure differential tube, the fixed shell is provided with a fixing hole, the fixing hole passes through the fixed shell, and the fixing hole is adapted to the first pressure differential tube.

6. The DOC-DPF assembly device according to claim 3, characterized in that: A fixing piece is arranged on the second pressure difference pipe, and the fixing piece is connected to the heat preservation shell.

7. The DOC-DPF assembly device according to claim 1, characterized in that: The DOC carrier is connected to the air intake pipe, an air intake flange is arranged at one end of the air intake pipe facing away from the DOC carrier, an air outlet flange is arranged at one end of the air outlet elbow facing away from the DPF carrier, and the air outlet flange is connected to the first assembly bracket.

8. The DOC-DPF assembly device according to claim 1, characterized in that: A second assembly bracket is arranged on the outer side wall of the DPF carrier, an assembly bracket groove is provided on the thermal insulation shell, the assembly bracket groove corresponds to the position of the second assembly bracket, and the assembly bracket groove penetrates the thermal insulation shell so that the second assembly bracket passes through the assembly bracket groove and is placed outside the thermal insulation shell.

9. The DOC-DPF assembly device according to claim 1, characterized in that: A urea nozzle mounting seat is arranged on the fixed shell, and a mounting seat groove is provided on the heat-insulating shell. The mounting seat groove corresponds to the position of the urea nozzle mounting seat, and the mounting seat groove passes through the heat-insulating shell.

Images