KR102324758B1 - Dosing module for vehicle - Google Patents

Abstract

A dosing module for a vehicle according to the present invention includes: a dosing pipe installed at the front end of the SCR catalyst to supply exhaust gas; an injector installed to inject urea water into the dosing pipe; and a guide member installed inside the dosing pipe and formed to extend along the urea water injection direction from around the injection hole of the injector.

Description

Dosing module for vehicle {DOSING MODULE FOR VEHICLE}

The present invention relates to a dosing module for a vehicle designed to prevent the injected urea water from being solidified due to a reverse flow due to the flow of exhaust gas in the dosing module for injecting urea water to the front end of the SCR catalyst.

As the exhaust regulation of diesel engines is gradually intensifying, the SCR (Selective Catalytic Reduction) system that can reduce _{nitrogen oxides (NO X ) while guaranteeing engine performance and fuel efficiency is mainly used.}

_{Here, the SCR system generates ammonia (NH 3} ) by spraying urea (UREA) water on the front end of the SCR catalyst, and this ammonia reacts with nitrogen oxides to be converted into _{nitrogen gas (N 2 ) harmless to the human body and discharged.} system that purifies.

On the other hand, as exhaust gas regulations are recently strengthened, an exhaust gas post-treatment system that integrates oxidation catalyst filter (DOC), soot reduction filter (DPF), and nitrogen oxide reduction filter (SCR) is being developed in order to respond to this. .

However, there was a problem in that the solidification phenomenon in which the urea water condensed at the inlet portion of the urea water injector during low-speed driving occurs.

The matters described as the above background art are only for improving the understanding of the background of the present invention, and should not be taken as acknowledging that they correspond to the prior art already known to those of ordinary skill in the art.

KR 10-0774717 B1

The present invention has been proposed to solve this problem. In the dosing module for injecting urea water to the front end side of the SCR catalyst, the injected urea water is guided around the urea water injector to prevent backflow due to the flow of exhaust gas. An object of the present invention is to provide a dosing module for a vehicle that prevents the urea water from being solidified by installing the member.

A dosing module for a vehicle according to the present invention for achieving the above object includes: a dosing pipe installed at the front end of the SCR catalyst to supply exhaust gas; an injector installed to inject urea water into the dosing pipe; and a guide member installed inside the dosing pipe and formed to extend from around the injection hole of the injector in the urea water injection direction.

A boss member on which an injector is mounted is formed in the dosing pipe, and the guide member is coupled to the boss member and is formed to extend from the boss member in a urea water injection direction of the injector.

The guide member may be characterized in that it is formed in a shape of a mesh (mesh) type.

The guide member may be characterized in that the hole size formed by the mesh type shape is formed smaller than the particle size of the number of urea.

The guide member is provided in a mesh (mesh) type and formed to surround the injection hole of the injector, and a second layer is provided in a mesh (mesh) type and formed to surround the outside of the first layer. can be characterized.

A mesh shape of the first layer and a mesh shape of the second layer of the guide member may be formed not to be aligned with each other.

The guide member may be formed to extend around the injection hole of the injector, and to have a larger diameter as the distance from the injector increases.

The guide member may be formed to be positioned at a point spaced apart by a set distance in the circumferential direction based on an area in which the urea water is injected from the injector and flows.

According to the dosing module for a vehicle having the structure as described above, it is possible to reduce a phenomenon in which urea water is solidified due to a reverse flow around the urea water injector injection port, thereby improving vehicle marketability.

In addition, since the mesh-type guide member forms two layers, even if urea water backflow occurs, the urea water is collected and vaporized by the guide member, thereby reducing the urea water solidification phenomenon.

1 is a view showing a connection relationship of a dosing module for a vehicle according to an embodiment of the present invention;
2 is a view showing in detail a dosing module for a vehicle according to an embodiment of the present invention;
3 is a view showing in detail a dosing module for a vehicle according to another embodiment of the present invention;
Figure 4 is a view showing the flow of urea water particles when the urea water of the present invention is sprayed to the guide member,
5 is a view showing the flow of urea water according to the conventional dosing module;
6 is a view showing the flow of urea water according to the dosing module for a vehicle of the present invention.

Hereinafter, a dosing module for a vehicle according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating a connection relationship between a dosing module for a vehicle according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a dosing module for a vehicle according to an embodiment of the present invention in detail.

1 to 2, the dosing module for a vehicle includes a dosing pipe 10 installed at the front end of the SCR catalyst to supply exhaust gas; an injector 20 installed to inject urea water into the dosing pipe 10; and a guide member 30 installed inside the dosing pipe 10 and formed to extend along the urea water injection direction from around the injection hole of the injector 20 .

Referring to FIG. 1 , the exhaust gas discharged from the engine first passes through an exhaust gas after-treatment device (Diesel Particulate Filter (DPF)), and is then provided to be supplied to the SCR catalyst. At this time, at the front end of the SCR catalyst, a dosing pipe 10 for connecting the DPF and the SCR catalyst to flow the exhaust gas is provided.

The dosing pipe 10 serves to supply exhaust gas and urea water to the SCR catalyst by connecting the DPF at one end and the SCR catalyst at the other end, and the injector 20 in the middle.

That is, when the injector 20 _{injects urea (UREA) water, which is an aqueous ammonia (NH 3} ) aqueous solution, into the dosing pipe 10, the urea water and the exhaust gas react within the SCR catalyst, so that nitrogen oxides are harmless to the environment. It is converted into gas (N ₂ ) and water (H _{2 O).}

Accordingly, since it is possible to prevent the emission of nitrogen oxides harmful to the environment while being included in the exhaust gas, it is possible to realize a vehicle that satisfies various environmental regulations while reducing environmental damage.

In particular, the dosing module for a vehicle of the present invention is installed inside the dosing pipe 10 as shown in FIG. 2, and includes a guide member 30 formed to extend in the urea water injection direction from around the injection hole of the injector 20. .

Conventionally, a phenomenon in which urea water condensed on the injection port side of the injector 20 occurred in a vehicle to which a guide member was not applied. because it does

That is, the urea water is highly likely to condense in a low-speed driving situation in which the exhaust gas flows at low speed and low temperature. will condense in According to this solidification phenomenon, the urea water may not be smoothly injected from the injector 20, so that the nitrogen oxide removal efficiency may be reduced.

Therefore, as in the present invention, the guide member 30 is formed to surround the injection hole of the injector 20, thereby preventing the exhaust gas from interfering with the flow of the urea water injected from the injector 20 in a low-speed vehicle driving situation. The urea water backflow phenomenon can be prevented. Although the passage through which the exhaust gas is introduced is not shown in detail in FIG. 2 , the dosing pipe 10 is preferably provided so that a passage through which the exhaust gas passing through the DPF flows is formed at a point not shown.

On the other hand, the dosing pipe 10 is provided with a boss member 25 to which the injector 20 is mounted; the guide member 30 is coupled to the boss member 25 and is removed from the boss member 25 . It may be formed to extend along the urea water injection direction of the injector 20 .

That is, the guide member 30 is welded or clamped to the boss member 25 so that the injector 20 can be exchanged smoothly due to a failure. In addition, since the guide member 30 is coupled to maintain a strong shape even in the flow of exhaust gas, it is possible to effectively prevent the reverse flow of urea water.

The shape of the guide member 30 shown in FIG. 2 is according to an embodiment and may be formed to extend in a direction parallel to the dosing pipe 10 .

At this time, the guide member 30 may be formed in a shape of a mesh (mesh) type. That is, since the injector 20 injects the urea water in the radial direction with respect to the injection hole when the injector 20 injects the urea water, the guide member 30 is parallel to the dosing pipe 10 as shown in FIG. It collides with the urea water to generate a backflow, which may impede the flow of the urea water.

Therefore, the guide member 30 is formed in a mesh type to prevent backflow even when it collides with the urea water, thereby smoothly maintaining the flow of the urea water.

Here, the guide member 30 is preferably formed to have a size of a hole formed by a mesh type shape smaller than the particle size of the number of elements.

For example, if the lattice hole size of the guide member 30 is larger than the particle size of the urea number, there is a possibility that the urea water passes through the guide member 30 and collides with the wall surface of the dosing pipe 10 to generate a backflow.

Therefore, when the number of urea collides with the guide member 30 , the hole size of the guide member 30 can be formed smaller than the particle size of the number of urea so that it can be collected by the guide member 30 .

As another embodiment, the guide member 30 may be formed to extend around the injection hole of the injector 20 , and may be formed to have a larger diameter as it moves away from the injector 20 .

As described above, the injector 20 injects the number of urea in the radial direction based on the injection hole, and the guide member 30 may also be formed to extend in the radial direction so that the number of urea and the guide member 30 do not collide at the source. .

3 is a view showing in detail a dosing module for a vehicle according to another embodiment of the present invention. Referring to FIG. 3 , it can be seen that the guide member 30 is formed to extend in a radial direction similar to the flow flow of urea water.

Therefore, while the guide member 30 prevents the urea water injected from the injector 20 from flowing backward by being interrupted by the flow of the exhaust gas, it is also possible to prevent the reverse flow of the urea water by the guide member 30 . .

In this case, the guide member 30 may be formed to be positioned at a point spaced apart by a set distance d in the circumferential direction based on an area where the urea water is injected from the injector 20 and flows.

That is, as shown in FIG. 3, the guide member 30 is provided to be formed at a position spaced apart by a set distance d from the radial flow region of the urea number, thereby minimizing the collision between the urea number and the guide member 30. Also, the situation in which the guide member 30 is positioned on the flow path of the urea water due to a design tolerance can be reduced.

On the other hand, there is a lot of cost and design difficulties in forming the lattice hole size of the guide member 30 to a size smaller than that of the fine particles of the number of elements. Therefore, instead of forming a small hole size in the mesh type shape of the guide member 30, the guide member 30 may be formed in a multiple layer structure.

Specifically, the guide member 30 of the present invention is provided in a mesh type and has a first layer 33 formed to surround the injection hole of the injector 20, and is provided in a mesh type and the first The second layer 35 may be formed to surround the outside of the layer 33 .

Figure 4 is a view showing the flow of urea particles when the urea water of the present invention is sprayed to the guide member (30). Referring to FIG. 4 , the guide member 30 composed of the first layer 33 and the second layer 35 is formed in a mesh shape, and the lattice hole size is larger than that of the fine particles of the urea number. However, since the urea water that has passed through the first layer 33 is collected inside the guide member 30 by the second layer 35 , it is possible to prevent the urea water from passing through the guide member 30 .

Therefore, by forming the guide member 30 in a multi-layer structure, the number of urea can be collected even if the lattice hole size is not formed smaller than the particle size of the urea number, and the collected urea number is the guide member 30 heated by the exhaust gas. ) is vaporized by

In this case, the mesh shape of the first layer 33 of the guide member 30 and the mesh shape of the second layer 35 may be formed not to be aligned with each other.

That is, if the first layer 33 and the second layer 35 are formed to be aligned in the same mesh shape, the urea water particles passing through the first layer 33 also pass through the second layer 35 . It may collide with the dosing pipe 10 to generate a backflow. Therefore, it can be provided so that the fine particles of urea water that have passed through the first layer (33) can be caught by the second layer (35) as much as possible.

Here, by providing a separate connection configuration connecting between the first layer 33 and the second layer 35, the number of urea may be smoothly collected.

5 is a diagram illustrating a flow flow of urea water according to a conventional dosing module, and FIG. 6 is a diagram illustrating a flow flow of urea water according to the dosing module for a vehicle of the present invention.

As described above, when the guide member is not applied in the prior art, it can be confirmed that the reverse flow occurs on the injector injection port side indicated by a circle as shown in FIG. 5 . On the other hand, when the guide member is applied to the inside of the dosing pipe as shown in FIG. 6, it can be seen that the reverse flow phenomenon of the injector injection port indicated by a circle is partially improved.

According to the dosing module for a vehicle having the structure as described above, it is possible to reduce a phenomenon in which urea water is solidified due to a reverse flow around the urea water injector injection port, thereby improving vehicle marketability.

In addition, since the mesh-type guide member forms two layers, even if urea water backflow occurs, the urea water is collected and vaporized by the guide member, thereby reducing the urea water solidification phenomenon.

Although the present invention has been shown and described with reference to specific embodiments, it is within the art that the present invention can be variously improved and changed without departing from the spirit of the present invention provided by the following claims. It will be obvious to those of ordinary skill in the art.

10: dosing pipe 20: injector
25: boss member 30: guide member
33: first floor 35: second floor

Claims (8)

a dosing pipe installed at the front end of the SCR catalyst to supply exhaust gas;
an injector installed to inject urea water into the dosing pipe; and
and a guide member installed inside the dosing pipe and formed to extend along the urea water injection direction from around the injection port of the injector;
The dosing module for a vehicle, characterized in that the guide member is formed in a shape of a mesh (mesh) type. The method according to claim 1,
A boss member on which an injector is mounted is formed in the dosing pipe;
The guide member is coupled to the boss member, and the dosing module for a vehicle, characterized in that it is formed to extend from the boss member along the urea water injection direction of the injector. delete The method according to claim 1,
The guide member is a dosing module for a vehicle, characterized in that the hole size formed by the mesh type shape is formed smaller than the particle size of the number of urea. The method according to claim 1,
The guide member is provided in a mesh (mesh) type and formed to surround the injection hole of the injector, and a second layer is provided in a mesh (mesh) type and formed to surround the outside of the first layer. A dosing module for a vehicle, characterized in that it. 6. The method of claim 5,
A dosing module for a vehicle, characterized in that the mesh shape of the first layer and the mesh shape of the second layer of the guide member are not aligned with each other. The method according to claim 1,
The dosing module for a vehicle, characterized in that the guide member is formed to extend around the injection hole of the injector, and is formed to have a larger diameter as the distance from the injector increases. 8. The method of claim 7,
The dosing module for a vehicle, characterized in that the guide member is formed to be positioned at a point spaced apart by a set distance in the circumferential direction based on an area where the urea water is injected from the injector and flows.

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