CN204457943U - Scr catalytic muffler - Google Patents

Abstract

The utility model discloses a kind of SCR catalytic muffler, comprise casing, one end of described casing is provided with suction tude, the other end is provided with outlet pipe, described casing is provided with air-inlet cavity successively, catalytic chamber and exhaust cavity, one end of described suction tude to be positioned at outside described casing and to be provided with urea nozzle, the other end is positioned at described air-inlet cavity, catalyzer is provided with in described catalytic chamber, described outlet pipe one end is positioned at described exhaust cavity, the other end is positioned at outside described casing, the center of casing end face described in the axis deviation being positioned at the suction tude of casing outside, said structure is compared and the SCR catalytic muffler of suction tude at casing center, take suction tude as axis rotation, the position of installing space can be adjusted, car load is made to be set up more flexible at the cloth of installing space.

Description

SCR catalytic muffler

technical field

The utility model relates to the technical field of engines, in particular to an SCR catalytic muffler for treating engine exhaust.

Background technique

With the continuous promotion and implementation of diesel oil emission regulations, it is particularly important to develop SCR catalytic mufflers with reliable structure, excellent performance and general versatility. The overall structure of the current SCR catalytic muffler is not reasonable. There are two main shapes of the box of the SCR catalytic muffler used on the diesel engine, one is cubic and the other is cylindrical. Diesel engines are cubic SCR catalytic The installation space provided by the muffler is large, while the installation space provided for the cylindrical box is small. There are mainly the following problems during use:

One is that the air inlet of the SCR catalytic muffler is located in the middle of the box body, and the required installation space is fixed and cannot be adjusted, which affects the flexibility of the installation space layout of the vehicle;

The second is that the installation of the intake pipe is not firm enough, and the intake pipe is only connected to the box body, forming a cantilever beam structure with poor mechanical strength;

The third is that the exhaust gas and urea mixed by the intake pipe into the SCR catalytic muffler box are not uniform enough, resulting in low conversion efficiency of nitrogen oxides and easy to produce urea crystallization;

Fourth, the exhaust gas is directly discharged from the exhaust tail pipe, and there is no special noise reduction component. The noise reduction ability is mainly realized by the intake pipe and the catalyst, and the noise reduction ability is very limited;

Fifth, the nitrogen and oxygen sensor is arranged on the exhaust tailpipe, and splashing of liquid droplets can easily cause the nitrogen and oxygen sensor to fail.

Contents of the invention

The technical problem to be solved by the utility model is: to provide an SCR catalytic muffler, which has a reasonable structure, is reliable in use, and can provide a flexible installation space for the whole vehicle. less noise.

In order to solve the above-mentioned technical problems, the technical solution of the utility model is: a SCR catalytic muffler, including a box body, an air intake pipe is installed at one end of the box body, and an exhaust pipe is installed at the other end, and the box body is provided with Air intake cavity, catalytic cavity and exhaust cavity, one end of the intake pipe is located outside the box body and a urea nozzle is installed, the other end is located in the intake cavity, a catalyst is arranged in the catalytic cavity, and the One end of the exhaust pipe is located in the exhaust cavity, the other end is located outside the box, and the axis of the air intake pipe outside the box is deviated from the center of the end surface of the box.

Due to the adoption of the above technical solution, the axis of the intake pipe located outside the box deviates from the center of the box. Compared with the SCR catalytic muffler with the intake pipe in the center of the box, the axis of the intake pipe can be rotated, and the installation can be adjusted. The location of the space makes the vehicle more flexible in the layout of the installation space.

As a further improvement, a baffle is installed in the air intake cavity of the box, one end of the air intake pipe is installed on the baffle, and the baffle divides the air intake cavity into two chambers, respectively It is a first chamber and a second chamber, the second chamber is connected with the catalytic chamber, and the partition plate is provided with a plurality of through holes connecting the first chamber and the second chamber, so The air outlet part of the air inlet pipe is located in the first chamber. The air intake pipe is supported by the partition, which greatly improves the mechanical strength, and the partition divides the intake chamber into two chambers. The gas must enter the second chamber from the first chamber through the partition, which ensures that the gas is mixed evenly and can Effectively reduce the occurrence of crystallization and improve the catalytic efficiency of nitrogen oxides.

As a further improvement, the air intake pipe includes an inner pipe and an outer pipe, the outer pipe is sleeved on the inner pipe, a part of the inner pipe is located outside the box, and the outer pipe is located in the air intake cavity , the outer tube is installed on the partition, the end of the outer tube is closed, the outer tube is provided with a number of air outlets, and the part of the outer tube provided with air outlets is located in the first chamber .

The exhaust gas and urea entering from the intake pipe enter the outer pipe through the inner pipe, and the end of the outer pipe is closed, and the gas is discharged from the air outlet of the outer pipe, which can improve the mixing effect of the gas, thereby further improving the catalytic efficiency.

As a further improvement, the through holes of the separator gradually increase from one end to the other end, and the sizes of all the through holes are not uniform, which can improve the gas mixing effect and reduce noise.

As a further improvement, a mounting plate is provided in the exhaust chamber of the box, one end of the exhaust pipe is installed on the mounting plate, and a sound-absorbing cotton is provided between the mounting plate and the end of the box. , the exhaust pipe passes through the sound-absorbing cotton, and the part of the exhaust pipe covered by the sound-absorbing cotton is provided with several through holes. The noise reduction effect can be improved through the sound-absorbing cotton, and the through holes on the exhaust pipe also play a role in noise reduction.

As a further improvement, one end of the exhaust pipe located at the exhaust cavity is provided with a flaring opening. Flaring can play the role of collecting exhaust gas, sealing sound-absorbing cotton and reducing back pressure

As a further improvement, a nitrogen and oxygen sensor is provided at the end of the box, and the nitrogen and oxygen sensor is connected to a tubular nitrogen and oxygen sensor seat, and the probe of the nitrogen and oxygen sensor is inserted into the nitrogen and oxygen sensor seat, and the nitrogen and oxygen sensor One end of the oxygen sensor seat passes through the sound-absorbing cotton and is installed on the mounting plate, and the part of the nitrogen-oxygen sensor seat covered by the sound-absorbing cotton is provided with several through holes. Since the nitrogen and oxygen sensor seat is a tubular structure, the probe of the nitrogen and oxygen sensor is installed in the nitrogen and oxygen sensor seat, which can prevent the sound-absorbing cotton from directly contacting the probe, and the nitrogen and oxygen sensor seat can guide the exhaust gas to the probe to make the nitrogen The oxygen sensor detects the correct result.

As a further improvement, a nitrogen-oxygen sensor protection bracket is provided at the end of the box, and the data processing unit of the nitrogen-oxygen sensor is located in the nitrogen-oxygen sensor protection bracket.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the structural representation of the partition of the utility model embodiment;

Fig. 3 is a schematic structural view of a nitrogen and oxygen sensor seat of an embodiment of the present invention;

Fig. 4 is the structural representation of the exhaust pipe of the utility model embodiment;

In the figure: 1, air inlet pipe; 101, inner pipe; 102, reducing pipe; 103, outer pipe; 2, air inlet chamber; 21, first chamber; 22, second chamber; 3, partition; 31 , through hole; 32, installation hole; 4, box body; 5, catalyst; 6, installation plate; 7, nitrogen and oxygen sensor seat; 8, noise reduction cotton; 9, nitrogen and oxygen sensor; 10, nitrogen and oxygen sensor protection bracket; 11 , exhaust pipe; 111, flaring; 12, urea nozzle.

Detailed ways

As shown in Figure 1, a SCR catalytic muffler includes a box body 4, an air intake pipe 1 is installed at one end of the box body 4, and an exhaust pipe 11 is installed at the other end, and the box body 4 is provided with an air intake chamber 2 and a catalytic chamber in turn. One end of the intake pipe 1 is located outside the box body 4, and a urea nozzle 12 is installed at this end, the other end of the intake pipe 1 is located in the intake chamber 2, a catalyst 5 is arranged in the catalytic chamber, and the exhaust pipe 11 One end is located in the exhaust chamber and the other end is located outside the box body 4. The axis of the intake pipe 1 located outside the box body 4 deviates from the center of the end face of the box body 4, which can make the installation space of the box body 4 more flexible. The box body 4 A partition 3 is installed in the air intake chamber 2, and one end of the intake pipe 1 is installed on the partition 3, so as to improve the mechanical strength of the intake pipe 1, and the partition 3 divides the air intake chamber 2 into two chambers , are respectively the first chamber 21 and the second chamber 22, the second chamber 22 is connected with the catalytic chamber, and the partition plate 3 is provided with a plurality of through holes 31 connecting the first chamber 21 and the second chamber 22, As shown in Figure 2, these through holes 31 are of different sizes and gradually increase from one end to the other end. The installation hole 32 for installing the intake pipe 1 on the partition 3 is not in the middle of the partition, which also facilitates the arrangement of the through holes 31. , the air outlet part of the air inlet pipe 1 is located in the first chamber 21 . The gas entering from the intake pipe 1 must enter the second chamber 22 through the first chamber 21 through the partition plate 3, which ensures that the gas is evenly mixed, can effectively reduce the occurrence of crystallization, and improve the catalytic efficiency of nitrogen oxides.

As a preferred solution, as shown in Figure 1, the intake pipe 1 includes an inner pipe 101 and an outer pipe 103, the outer pipe 103 is sleeved on the inner pipe 101, the inner pipe 101 and the outer pipe 103 are connected by a section of reducing pipe 102, and the inner A part of the pipe 101 is located outside the box 4, the outer pipe 103 is located in the air inlet chamber 2, the outer pipe 103 is installed on the partition plate 3, the end of the outer pipe 103 is closed, and the outer pipe 103 is provided with some air outlet holes. The part of the pipe 103 provided with an air outlet is located in the first chamber 21, the waste gas and urea entering through the inner pipe 101 enter the outer pipe 103 through the inner pipe 101, and the end of the outer pipe 103 is closed, and the gas is passed through The air outlet of the outer tube 103 is discharged, and the gas can form a turbulent flow, which improves the mixing effect of the gas, thereby further improving the catalytic efficiency.

As a preferred solution, as shown in Figure 1, a mounting plate 6 is provided in the exhaust chamber of the box body 4, and one end of the exhaust pipe 11 is installed on the mounting plate 6, and between the mounting plate 6 and the end of the box body 4 A sound-absorbing cotton 8 is provided, and the exhaust pipe 11 passes through the sound-absorbing cotton 8. As shown in FIG. 4 , the part of the exhaust pipe 11 covered by the sound-absorbing cotton 8 is provided with several through holes. The noise reduction effect can be improved by the sound-absorbing cotton 8, and the through hole on the exhaust pipe 11 also plays a role in noise reduction, and the exhaust pipe 11 is provided with a flaring 111 at one end of the exhaust chamber. The exhaust gas can be collected and the back pressure can be reduced through the flaring 111 .

As a preferred solution, as shown in Figure 1, the end of the box body 4 is provided with a nitrogen and oxygen sensor 9, the nitrogen and oxygen sensor 9 is connected with a tubular nitrogen and oxygen sensor seat 7, and the probe of the nitrogen and oxygen sensor 9 is inserted into the nitrogen and oxygen sensor seat 7, one end of the nitrogen and oxygen sensor seat 7 passes through the sound-absorbing cotton 8 and is installed on the mounting plate 6. As shown in Figure 3, the nitrogen-oxygen sensor seat 7 is a tubular structure. There are several through holes, since the probe of the nitrogen and oxygen sensor 9 is installed in the nitrogen and oxygen sensor seat 7, it can prevent the direct contact between the sound-absorbing cotton 8 and the probe, which will affect the detection accuracy, and the nitrogen and oxygen sensor seat 7 can guide the exhaust gas to the At the probe, so that the nitrogen and oxygen sensor 9 detects the correct result of the nitrogen and oxygen content of the exhaust gas, the nitrogen and oxygen sensor seat 7 can make the installation position of the nitrogen and oxygen sensor 9 flexible.

As a preferred solution, as shown in Figure 1, the end of the box body 4 is provided with a nitrogen and oxygen sensor protection bracket 10, the nitrogen and oxygen sensor protection bracket 10 is ring-shaped, sleeved on the outer periphery of the exhaust pipe 11, the nitrogen and oxygen sensor The data processing unit of the oxygen sensor 9 is located in the protection bracket 10 of the nitrogen and oxygen sensor.

To sum up, this product has compact and reasonable structure, reliable use, high catalytic efficiency and good noise reduction effect.

Claims (8)

1. SCR catalytic muffler, including a box body, an air intake pipe is installed at one end of the box body, and an exhaust pipe is installed at the other end. One end of the air pipe is located outside the box and is equipped with a urea nozzle, the other end is located in the air intake chamber, a catalyst is provided in the catalytic chamber, one end of the exhaust pipe is located in the exhaust chamber, and the other end is Located outside the box, it is characterized in that: the axis of the air intake pipe outside the box deviates from the center of the end surface of the box. 2. The SCR catalytic muffler as claimed in claim 1, characterized in that: a baffle is installed in the air intake chamber of the box body, one end of the air intake pipe is installed on the baffle, and the baffle will The air intake chamber is divided into two chambers, namely the first chamber and the second chamber, the second chamber is connected with the catalytic chamber, and there are several connecting chambers on the partition plate. The first chamber and the through hole of the second chamber, the air outlet part of the inlet pipe is located in the first chamber. 3. The SCR catalytic muffler according to claim 2, characterized in that: the intake pipe includes an inner pipe and an outer pipe, the outer pipe is sleeved on the inner pipe, and a part of the inner pipe is located in the box Outside the body, the outer tube is located in the air inlet cavity, the outer tube is installed on the partition, the end of the outer tube is closed, and the outer tube is provided with a number of air outlet holes. The part provided with the air outlet is located in the first chamber. 4. The SCR catalytic muffler according to claim 2, characterized in that: the through hole of the partition gradually increases from one end to the other end. 5. The SCR catalytic muffler as claimed in claim 1, characterized in that: a mounting plate is arranged in the exhaust cavity of the box body, one end of the exhaust pipe is mounted on the mounting plate, and the mounting plate A sound-absorbing cotton is provided between the end of the box body, the exhaust pipe passes through the sound-absorbing cotton, and the part of the exhaust pipe covered by the sound-absorbing cotton is provided with several through holes. 6. The SCR catalytic muffler according to claim 5, characterized in that: one end of the exhaust pipe located in the exhaust cavity is provided with a flaring opening. 7. SCR catalytic muffler as claimed in claim 5, is characterized in that: the end of described casing is provided with nitrogen and oxygen sensor, and described nitrogen and oxygen sensor is connected with tubular nitrogen and oxygen sensor seat, and the nitrogen and oxygen sensor of described nitrogen and oxygen sensor The probe is inserted into the nitrogen and oxygen sensor seat, and one end of the nitrogen and oxygen sensor seat is installed on the mounting plate through the sound-absorbing cotton, and the part of the nitrogen-oxygen sensor seat covered by the sound-absorbing cotton is provided with several through holes. 8 . The SCR catalytic muffler according to claim 5 , wherein a protective bracket for a nitrogen and oxygen sensor is provided at the end of the box, and the data processing unit of the nitrogen and oxygen sensor is located in the protective bracket for the nitrogen and oxygen sensor.