CN203050864U - SCR post-processing silencer assembly - Google Patents

Abstract

The utility model provides an SCR post-processing muffler assembly, which includes a muffler shell and an SCR post-processor. The end of the muffler shell is provided with an air inlet pipe and an air outlet pipe. The plate is fixedly installed with a shroud, and the inlet end of the shroud is connected with the intake pipe. The inlet section of the shroud is tapered, and it gradually increases along the forward direction of the gas. The SCR post-processor is located at the end of the shroud. Between the tapered inlet section and the outlet end, the maximum diameter of the flow guide cover is smaller than the diameter of the silencer shell, and the length of the flow guide cover is smaller than the length of the silencer shell. The assembly has the advantages of simple and compact structure, good noise reduction effect, convenience and practicality, light weight, easy manufacture and low cost, and it is arranged horizontally on the whole vehicle, occupying less vertical space, which is beneficial to the layout of short-wheelbase vehicles.

Description

An SCR aftertreatment muffler assembly

technical field

The utility model relates to an SCR post-processing muffler assembly, which belongs to the technical field of medium and heavy-duty automobile parts.

Background technique

With the increasingly stringent environmental protection regulations, domestic medium and heavy trucks are beginning to match diesel engines that meet the National IV and National V emission standards. In order to meet the emission standards, DPF or SCR post-processor must be used in the exhaust system of the vehicle. SCR post-processor The cost of the technical route is relatively low, so it has become the preferred solution for medium and heavy truck manufacturers. At present, most of the SCR after-processors are integrated inside the muffler, and the two form the SCR after-treatment muffler assembly. The main layout types of the assembly are square horizontal and cylindrical vertical hoisting arrangements. The main disadvantage of the square structure is its heavy weight; the cylindrical hoisting arrangement has more connectors, takes a long time to assemble, and takes up a lot of longitudinal space, making it difficult to arrange on short-wheelbase vehicles. This is the deficiency of the existing technology place.

Contents of the invention

The technical problem to be solved by the utility model is to provide a simple, compact and light weight SCR aftertreatment muffler assembly aiming at the shortcomings of the prior art.

This solution is realized through the following technical measures: the SCR aftertreatment muffler assembly includes a muffler shell and an SCR afterprocessor, the end of the muffler shell is provided with an air intake pipe and an air outlet pipe, and the muffler shell A shroud is fixedly installed in the body through a partition, and the inlet end of the shroud is connected with the intake pipe. The inlet section of the shroud is conical, and its diameter gradually increases along the direction of the gas forward. The SCR post-processor is located Between the tapered inlet section and the outlet end of the flow guide cover, the maximum diameter of the flow guide cover is smaller than the diameter of the silencer shell, and the length of the flow guide cover is smaller than the length of the silencer shell.

The above-mentioned air outlet pipe is a tapered pipe, and the diameter of the end connected to the muffler shell is larger than the diameter of the end away from the muffler shell. This structure can reduce the exhaust back pressure to the greatest extent, so as to improve the fuel economy of the whole vehicle sex.

The above-mentioned air intake pipe and air outlet pipe are located at the same end of the muffler housing, so as to facilitate the change of exhaust direction for vehicles with different purposes.

The end of the muffler housing provided with the intake pipe is also provided with a muffler fixing bracket, through which the SCR aftertreatment muffler assembly is fixedly installed on the vehicle.

The other end of the muffler housing opposite to the end provided with the intake pipe is provided with a heat shield support, and the heat insulation device is installed on the heat shield support to prevent personnel from being scalded when approaching.

The ends of the air inlet pipe and the air outlet pipe are fixedly installed with connecting flanges, and the air inlet pipe and the air outlet pipe are respectively connected to the engine exhaust pipe and the vehicle exhaust tailpipe through the connecting flanges.

The beneficial effects of the utility model:

1. Simple and compact structure, good noise reduction effect, convenient and practical, light in weight, easy to manufacture and low in cost.

2. It is arranged horizontally on the whole vehicle and occupies less vertical space, which is beneficial to the layout of short wheelbase models.

Description of drawings

Fig. 1 is a schematic structural view of a specific embodiment of the present invention.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a schematic diagram of gas flow in a specific embodiment of the present invention.

In the figure, 1 is the shroud, 2 is the SCR post-processor, 3 is the muffler shell, 4 is the heat shield support, 5 is the partition, 6 is the connecting flange, 7 is the air outlet pipe, and 8 is the silencer Device fixing bracket, 9 is an air intake pipe.

Detailed ways

In order to clearly illustrate the technical characteristics of this solution, the following will describe this solution through specific implementation modes and in conjunction with the accompanying drawings.

An SCR post-processing muffler assembly, as shown in Figure 1-2, it includes a muffler housing 3 and an SCR after-processor 2, one end of the muffler housing 3 is provided with an inlet pipe 9, an outlet Trachea 7 and muffler fixed bracket 8, the other end is provided with heat shield support 4, the end of inlet pipe 9 and outlet pipe 7 is fixedly installed with connecting flange 6, outlet pipe 7 is a tapered pipe, and it is connected with the muffler The diameter of the connecting end of the housing 3 is greater than the diameter of the end away from the muffler housing 3 . The muffler shell 3 is fixedly installed with a shroud 1 through the partition plate 5, the inlet end of the shroud 1 is connected with the intake pipe 9, the inlet section of the shroud 1 is conical, and its diameter is along the forward direction of the gas. The direction gradually increases. The SCR afterprocessor 2 is located between the conical inlet section and the outlet end of the shroud 1. The maximum diameter of the shroud 1 is smaller than the diameter of the muffler shell 3, and the length of the shroud 1 is smaller than that of the muffler. The length of the device housing 3.

As shown in Figure 3, after the high-temperature exhaust gas from the engine is mixed with the urea solution, it enters the interior of the shroud 1 through the intake pipe 9, and is more evenly mixed and diffused to the SCR post-processor 2 through the conical inlet section of the shroud 1 The front section, and enters the SCR post-processor 2 for chemical reaction, the NO _X content in the exhaust gas is reduced to the legal limit value. The reacted exhaust gas enters the gap between the wind deflector 1 and the muffler housing 3 through the outlet end of the wind deflector 1 , and finally gradually gathers at the tapered air outlet pipe 7 and is discharged from the air outlet pipe 7 .

The technical features not described in the utility model can be realized by the prior art, and will not be repeated here.

Claims (6)

1. An SCR post-processing muffler assembly, which includes a muffler housing and an SCR post-processor, is characterized in that: the end of the muffler housing is provided with an air intake pipe and an air outlet pipe, and the muffler housing passes through The separator is fixedly installed with a shroud, and the inlet end of the shroud is connected with the intake pipe. The inlet section of the shroud is conical, and its diameter gradually increases along the forward direction of the gas. The SCR post-processor is located in the shroud. Between the tapered inlet section and the outlet end, the maximum diameter of the shroud is smaller than the diameter of the muffler shell, and the length of the shroud is less than the length of the muffler shell. 2. The SCR aftertreatment muffler assembly according to claim 1, characterized in that: the outlet pipe is a conical pipe, and the diameter of the end connected to the muffler shell is larger than the diameter of the end away from the muffler shell. 3. The SCR aftertreatment muffler assembly according to claim 1 or 2, characterized in that: the inlet pipe and the outlet pipe are located at the same end of the muffler shell. 4. The SCR after-treatment muffler assembly according to claim 3, characterized in that: the end of the muffler shell provided with the intake pipe is also provided with a muffler fixing bracket. 5. The SCR aftertreatment muffler assembly according to claim 4, characterized in that: the other end of the muffler housing opposite to the end where the intake pipe is provided is provided with a heat shield support. 6. The SCR aftertreatment muffler assembly according to claim 3, characterized in that: the ends of the inlet pipe and the outlet pipe are fixedly installed with connecting flanges.

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