Post-treatment catalytic silencer

Abstract

The utility model discloses a post-treatment catalytic silencer which comprises a catalytic silencer body, a nozzle, an injection pipe, a cooling liquid inlet pipe and a cooling liquid return pipe. One end of the nozzle is mounted on the catalytic silencer body and faces the interior of the catalytic silencer body; one end of the injection pipe is connected with the other end of the nozzle, and the other end of the injection pipe is used for being connected with an injection pump; one end of the cooling liquid inlet pipe is connected with the other end of the nozzle, and the other end of the cooling liquid inlet pipe is used for being connected with a cooling liquid supply mechanism; one end of the cooling liquid return pipe is connected with the other end of the nozzle, and the other end of the cooling liquid return pipe is used for being connected with the cooling liquid supply mechanism. Therefore, the after-treatment catalytic silencer is simple and reasonable in structure, a whole vehicle can be conveniently connected with a pipeline, the anti-blocking capacity of the nozzle is improved, and the risk of urea crystallization is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of post-processing equipment, in particular to a post-processing catalytic muffler. Background Art

[0002] At a time when environmental protection and energy efficiency are increasingly valued, after-treatment catalytic mufflers play a vital role in automotive emission control systems. However, traditional after-treatment catalytic muffler designs still face challenges in some aspects. In particular, traditional piping designs are often complex and not easy to connect to the entire vehicle, which increases the difficulty of installation and maintenance. In addition, nozzle blockage and urea crystallization are also common problems in traditional designs, which not only affect the performance of the muffler, but may also lead to failure of the entire emission control system.

[0003] The nozzle blockage problem is often caused by unreasonable design of cooling water pipeline or improper layout of urea injection pipeline. During long-term use, impurities may accumulate at the nozzle or urea may crystallize due to temperature changes, thereby clogging the nozzle and affecting the injection effect. At the same time, there are also problems with the design of traditional urea injection pipelines. For example, if the pipeline position is too low or the backflow is insufficient, urea may remain in the pipeline and crystallize.

[0004] Therefore, in response to the above problems, it is necessary to develop a new type of after-treatment catalytic muffler to simplify the pipeline design, facilitate vehicle connection, improve the nozzle's anti-clogging ability, and reduce the risk of urea crystallization.

[0005] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0006] The utility model aims to provide a post-treatment catalytic muffler with a simple and reasonable structure, convenient for connecting pipelines of the whole vehicle, improved anti-clogging ability of the nozzle, and reduced risk of urea crystallization.

[0007] To achieve the above-mentioned purpose, the utility model provides a post-treatment catalytic muffler, comprising: a catalytic muffler body, a nozzle, an injection pipe, a coolant inlet pipe and a coolant return pipe. One end of the nozzle is mounted on the catalytic muffler body and faces the interior of the catalytic muffler body; one end of the injection pipe is connected to the other end of the nozzle, and the other end of the injection pipe is used to connect to a jet pump; one end of the coolant inlet pipe is connected to the other end of the nozzle, and the other end of the coolant inlet pipe is used to connect to a coolant supply mechanism; and one end of the coolant return pipe is connected to the other end of the nozzle, and the other end of the coolant return pipe is used to connect to the coolant supply mechanism; wherein both ends of the injection pipe, the coolant inlet pipe and the coolant return pipe are provided with curved pipe sections, and the two curved pipe sections are connected by a straight pipe section.

[0008] In one embodiment of the present utility model, the post-treatment catalytic muffler further includes a nitrogen oxide sensor installed on the catalytic muffler body.

[0009] In one embodiment of the utility model, the post-treatment catalytic muffler also includes a pipe shield, which is covered on the catalytic muffler body, and the nozzle, the injection pipe, the coolant inlet pipe and the coolant return pipe are all located between the pipe shield and the catalytic muffler body.

[0010] In one embodiment of the present utility model, the straight pipe section of the injection pipe is higher than the straight pipe section of the water outlet pipe, and the straight pipe section of the water outlet pipe is higher than the straight pipe section of the water inlet pipe.

[0011] In one embodiment of the present utility model, the angle between the straight pipe section of the water outlet pipe and the center point of the nozzle is greater than 35°.

[0012] In one embodiment of the present utility model, the angle between the straight pipe section of the water inlet pipe and the center point of the nozzle is less than 0°.

[0013] In one embodiment of the present utility model, the straight pipe section of the water inlet pipe is higher than the straight pipe section of the injection pipe, and the straight pipe section of the injection pipe is higher than the straight pipe section of the water outlet pipe.

[0014] In one embodiment of the present invention, a heat insulation layer is provided outside the catalytic muffler body.

[0015] In one embodiment of the utility model, a plurality of fixing mechanisms are provided on the thermal insulation layer, and the injection pipe, the coolant inlet pipe and the coolant return pipe are arranged between the pipeline shield and the thermal insulation layer through the plurality of fixing mechanisms.

[0016] In one embodiment of the present invention, the heat insulation layer is fireproof cotton.

[0017] Compared with the prior art, the post-treatment catalytic muffler according to the utility model has a simple and reasonable structure, is convenient for connecting pipelines of the whole vehicle, improves the anti-clogging ability of the nozzle, and reduces the risk of urea crystallization. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a high-position pipeline of a post-treatment catalytic muffler according to an embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of another high-position pipeline arrangement of the after-treatment catalytic muffler according to one embodiment of the utility model.

[0020] Description of main reference numerals:

[0021] 1- catalytic muffler body, 2- nozzle, 3- injection pipe, 4- coolant inlet pipe, 5- coolant return pipe, 6- nitrogen oxide sensor, 7- pipe shield, 8- fixing mechanism. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0023] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0024] Figure 1 It is a structural schematic diagram of a high-position pipeline of a post-treatment catalytic muffler according to an embodiment of the utility model; Figure 2 It is a structural schematic diagram of another high-position pipeline arrangement of the after-treatment catalytic muffler according to one embodiment of the utility model.

[0025] like Figure 1 to Figure 2As shown, a post-treatment catalytic muffler according to a preferred embodiment of the utility model comprises: a catalytic muffler body 1, a nozzle 2, a spray pipe 3, a coolant inlet pipe 4 and a coolant return pipe 5. One end of the nozzle 2 is mounted on the catalytic muffler body 1 and faces the inside of the catalytic muffler body 1; one end of the spray pipe 3 is connected to the other end of the nozzle 2, and the other end of the spray pipe 3 is used to connect to a spray pump; one end of the coolant inlet pipe 4 is connected to the other end of the nozzle 2, and the other end of the coolant inlet pipe 4 is used to connect to a coolant supply mechanism; and one end of the coolant return pipe 5 is connected to the other end of the nozzle 2, and the other end of the coolant return pipe 5 is used to connect to the coolant supply mechanism; wherein, both ends of the spray pipe 3, the coolant inlet pipe 4 and the coolant return pipe 5 are provided with curved pipe sections, and the two curved pipe sections are connected by a straight pipe section.

[0026] In one embodiment of the present utility model, the post-treatment catalytic muffler further includes a nitrogen oxide sensor 6 installed on the catalytic muffler body 1 .

[0027] In one embodiment of the utility model, the post-treatment catalytic muffler also includes a pipe shield 7, which is covered on the catalytic muffler body 1, and the nozzle 2, the injection pipe 3, the coolant inlet pipe 4 and the coolant return pipe 5 are all located between the pipe shield 7 and the catalytic muffler body 1.

[0028] In one embodiment of the present utility model, the straight pipe section of the injection pipe 3 is higher than the straight pipe section of the water outlet pipe, and the straight pipe section of the water outlet pipe is higher than the straight pipe section of the water inlet pipe.

[0029] In one embodiment of the present utility model, the angle between the straight pipe section of the water outlet pipe and the center point of the nozzle 2 is greater than 35°.

[0030] In one embodiment of the present utility model, the angle between the straight pipe section of the water inlet pipe and the center point of the nozzle 2 is less than 0°.

[0031] In one embodiment of the present utility model, the straight pipe section of the water inlet pipe is higher than the straight pipe section of the injection pipe 3, and the straight pipe section of the injection pipe 3 is higher than the straight pipe section of the water outlet pipe.

[0032] In one embodiment of the present invention, a heat insulation layer is disposed outside the catalytic muffler body 1 .

[0033] In one embodiment of the utility model, a plurality of fixing mechanisms 8 are provided on the thermal insulation layer, and the injection pipe 3, the coolant inlet pipe 4 and the coolant return pipe 5 are arranged between the pipeline shield 7 and the thermal insulation layer through the plurality of fixing mechanisms 8.

[0034] In one embodiment of the present invention, the heat insulation layer is fireproof cotton.

[0035] In practical applications, the post-treatment catalytic muffler of the utility model can be conveniently connected to the whole vehicle without removing the outer cover of the pipeline. The high-inlet and high-outlet arrangement of the cooling water pipeline improves the anti-clogging ability of the nozzle 2. The high inlet of the injection pipe 3 can reduce the risk of urea crystallization. The sensor nozzle 2 and the like are hidden in the pipeline shield 7 to reduce straw accumulation, and the appearance is neat and beautiful. The injection system of the post-treatment catalytic muffler includes a metering injection pump, a nozzle 2 and a urea tank. The working process of the injection system is divided into three stages: emptying, injection, and liquid return. In the emptying state, the nozzle 2 is closed, the urea pump works, and the air in the urea pump is discharged into the urea tank. After the emptying is successful, the injection state is entered. At this time, the nozzle 2 is opened, the urea pump works, and urea is injected into the exhaust gas. After stopping the injection, the liquid return state is entered. At this time, the nozzle 2 is closed, and the urea in the nozzle 2 is pumped back into the urea tank by the reversing device.

[0036] Nozzle 2 cooling pipe, urea injection pipe 3 Figure 1 or Figure 2 The arrangement meets the use requirements in the hot shutdown state and is conducive to preventing the nozzle 2 from being blocked. The specific functions are as follows:

[0037] 1. After shutdown, a certain amount of antifreeze can be maintained in the cooling water chamber of nozzle 2; after hot shutdown, the antifreeze cooling nozzle 2 stops flowing, and the temperature of nozzle 2 continues to rise due to the heating effect of the residual heat of the catalyst. When the temperature reaches the boiling point of the antifreeze, the antifreeze boils (phase change occurs) and absorbs heat, which can reduce the maximum temperature that nozzle 2 can reach and prevent nozzle 2 from being damaged;

[0038] 2. The urea injection pipe 3 is arranged at a high position to prevent insufficient residual urea during withdrawal. A certain amount of urea liquid can inhibit the formation of crystals, dissolve the crystals that have already formed, and reduce the risk of urea crystallization.

[0039] The specific requirements are as follows:

[0040] 1. The inclination angle of the high-position pipeline (coolant return pipe 5) of the cooling pipeline is required to be greater than 35°; the inclination angle of the low-position pipeline (coolant inlet pipe 4) is required to be less than 0°;

[0041] 2. The inlet and outlet pipes of the cooling pipe are required to have a straight pipe section at the interface. The length of the straight pipe section should be able to store more than 16ml of liquid. When converted to length, the straight pipe section required for a cooling pipe with an inner diameter of 10mm is about 200mm;

[0042] 3. If the angle of the cooling pipe with low water inlet and high water outlet cannot be met, the solution of high water inlet and outlet arrangement is accepted (the pipe is tilted upward, the angle is greater than 35°; the cooling effect is worse than the low water inlet and high water outlet solution); converted length: the straight pipe section required for a cooling pipe with an inner diameter of 10mm is about 200mm;

[0043] 4. The urea injection pipe 3 is arranged at a high position (inclined upward), and the straight pipe section required for the injection pipe 3 is about 150mm-200mm (between the injection pipe 3 quick plug and the highest point of the injection pipe 3).

[0044] In summary, the post-treatment catalytic muffler of the utility model has a simple and reasonable structure, is convenient for connecting the pipelines of the whole vehicle, improves the anti-clogging ability of the nozzle, and reduces the risk of urea crystallization.

[0045] The foregoing description of specific exemplary embodiments of the utility model is for the purpose of illustration and illustration. These descriptions are not intended to limit the utility model to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the utility model and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the utility model and various different options and changes. The scope of the utility model is intended to be defined by the claims and their equivalents.

Claims

1. A post-treatment catalytic muffler, characterized in that: include: Catalytic muffler body; a nozzle, one end of which is mounted on the catalytic muffler body and faces the interior of the catalytic muffler body; An injection pipe, one end of which is connected to the other end of the nozzle, and the other end of which is used to be connected to a jet pump; A coolant inlet pipe, one end of which is connected to the other end of the nozzle, and the other end of which is used to be connected to a coolant supply mechanism; as well as A coolant return pipe, one end of which is connected to the other end of the nozzle, and the other end of which is used to be connected to the coolant supply mechanism; Wherein, both ends of the injection pipe, the coolant inlet pipe and the coolant return pipe are provided with curved pipe sections, and the two curved pipe sections are connected by a straight pipe section.

2. The post-treatment catalytic muffler according to claim 1, characterized in that: It also includes a nitrogen oxygen sensor installed on the catalytic muffler body.

3. The post-treatment catalytic muffler according to claim 1, characterized in that: It also includes a pipeline shield, which is covered on the catalytic muffler body, and the nozzle, the injection pipe, the coolant inlet pipe and the coolant return pipe are all located between the pipeline shield and the catalytic muffler body.

4. The post-treatment catalytic muffler according to claim 1, characterized in that: The straight pipe section of the injection pipe is higher than the straight pipe section of the water outlet pipe, and the straight pipe section of the water outlet pipe is higher than the straight pipe section of the water inlet pipe.

5. The post-treatment catalytic muffler according to claim 4, characterized in that: The included angle between the straight pipe section of the water outlet pipe and the center point of the nozzle is greater than 35°.

6. The post-treatment catalytic muffler according to claim 5, characterized in that: The included angle between the straight pipe section of the water inlet pipe and the center point of the nozzle is less than 0°.

7. The post-treatment catalytic muffler according to claim 1, characterized in that: The straight pipe section of the water inlet pipe is higher than the straight pipe section of the injection pipe, and the straight pipe section of the injection pipe is higher than the straight pipe section of the water outlet pipe.

8. The post-treatment catalytic muffler according to claim 3, characterized in that: A heat insulation layer is arranged outside the catalytic muffler body.

9. The post-treatment catalytic muffler according to claim 8, characterized in that: A plurality of fixing mechanisms are arranged on the heat insulation layer, and the injection pipe, the coolant inlet pipe and the coolant return pipe are arranged between the pipeline shield and the heat insulation layer through the plurality of fixing mechanisms.

10. The post-treatment catalytic muffler according to claim 8, characterized in that: The heat insulation layer is fireproof cotton.

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