KR200438615Y1 - A exhaust gas reducing muffler for natural gas cars - Google Patents

Abstract

The present invention relates to a muffler which is connected to the exhaust manifold of an engine and exhausts it while reducing harmful gas and noise from the engine. More specifically, it is horizontally mounted on the lower part of the vehicle and has left and right end ends. The long cylindrical outer casing is welded and attached to the left side of the outer casing, and is inserted through the right angle to the left side of the outer circumferential surface of the outer casing and a rounded curved surface is formed at one end thereof so as to be in close contact with the inner circumferential surface of the outer casing. Exhaust gas in which a plurality of exhaust holes are perforated on the outer circumferential surface inserted inside the outer casing is easily welded to one end from the outside through the curved surface welding hole drilled in the outer casing of the portion in close contact with the curved surface. Inlet pipe, the inner side of the outer casing in a cylindrical shape on both sides open A catalyst converter is provided with a housing welded horizontally to the lower part and a plurality of soot through holes are densely drilled in the housing to insert and fix a cylindrical catalyst member for oxidation and reduction of the harmful gas introduced therein. And, the exhaust gas discharge pipe is inserted through the horizontal direction in the center portion of the right side plate and the exhaust gas discharge pipe has a plurality of vent holes perforated on the outer peripheral surface of the left end located in the inner casing at a right angle It relates to a soot reduction muffler for a natural gas vehicle, characterized in that composed of exhaust gas discharge portion which is fitted in a standing state.

Soot Reduction Muffler, Exhaust Gas Inlet Tube, Catalytic Converter, Exhaust Gas Exhaust Tube, Block

Description

A exhaust gas reducing muffler for natural gas cars}

1 is a perspective view of a smoke reduction muffler for a natural gas vehicle according to the present invention

2 is an exploded perspective view of a smoke reduction muffler for a natural gas vehicle according to the present invention

Figure 3 is a perspective schematic view of a state in which a portion of the smoke reduction muffler for natural gas vehicle according to the present invention is cut off

Figure 4 is a longitudinal cross-sectional schematic diagram of the catalytic converter in the smoke reduction muffler for natural gas vehicle according to the present invention

5 is a schematic cross-sectional view of a smoke reduction muffler for a natural gas vehicle connected to the front pipe of an engine according to the present invention;

                  <Description of Symbols for Major Parts of Drawings>

1. Soot Reduction Muffler 2. Outer Casing

3a, 3b. Side plates 4a, 4b. Welding projection

5. Exhaust gas inlet pipe 6. Curved surface

7. Curved surface welding hole 8a, 8b. Incision

9. Engine 10. Exhaust manifold

11. Front pipes 12a, 12b. Tightening Clamp

13. Vent hole 14. Catalytic converter

15. Housing 16. Soot Through Hole

17. Catalyst members 18a and 18b. Flow barrier

19. Exhaust gas exhaust unit 20. Exhaust gas exhaust pipe

21. Blocker 22. Ventilation hole

23. Support protrusion 24. Exhaust pipe

The present invention relates to a muffler (muffler) that is connected to the exhaust manifold of the engine of the exhaust device of the natural gas vehicle to reduce the harmful gas and noise from the engine, more specifically, is mounted horizontally in the lower part of the vehicle The long cylindrical outer casing is welded and attached to the left and right end of the outer casing, respectively, and penetrated in a right angle to the left side of the outer circumferential surface of the outer casing. While being in close contact with the curved surface and the surface of the outer casing of the perforated through the curved surface welding hole, one end is to be easily welded from the outside and the outer peripheral surface inserted into the outer casing of the entire plurality of exhaust holes are perforated Exhaust gas inlet pipe, and the outer casing in the cylindrical shape of the left and right sides open A housing which is welded horizontally is provided at the inner center portion, and a plurality of soot through holes are densely drilled inside the housing to insert a cylindrical catalyst member which redoxes and removes harmful gases from the exhaust gas. A fixed catalytic converter and an exhaust gas discharge pipe inserted into the center of the right side plate in the horizontal direction are provided, and the exhaust gas discharge pipe has a plurality of vent holes drilled in the outer peripheral surface of the left end located inside the outer casing. The blocking plate is fitted at a right angle, but the blocking plate is positioned to be spaced apart from the right side plate at a time so that a large amount of exhaust gas flows into the exhaust gas discharge pipe at the same time to prevent overload or backflow. Natural gas comprising an exhaust gas discharge unit Ryangyong relates to a diesel particulate filter muffler.

Recently, as the regulations on environmental pollution become more strict, natural gas vehicles that use compressed natural gas (CNG) as a raw material are increasing. Compressed natural gas used as fuel for natural gas vehicles Since the main component is methane gas (CH ₄ ), compared to the existing diesel vehicles, the research on natural gas vehicles, which are low-pollution vehicles, has been actively conducted because there are less harmful gases or fine dust and less noise.

Such an exhaust system of a natural gas vehicle generally includes an exhaust manifold in which a plurality of branch pipes connected to an engine are merged into one, and harmful particulates such as particulate matter, carbon monoxide, hydrocarbons, and nitrogen oxides from the engine (harmful gases). Exhaust gas reduction device such as diesel particulate filter trap (DPF) or diesel oxidation catalyst (DOC) to remove the exhaust gas, and exhaust gas that reduces noise and reduces harmful gas to the outside of the vehicle. The exhaust manifold, the exhaust gas reducing device, and the muffler are connected to each other by connecting pipes, and the exhaust gas from the engine is discharged to the outside through the muffler in a state in which harmful gas and noise are reduced. It is intended to be discharged.

However, such a conventional exhaust device has a structure in which the exhaust gas reducing device and the muffler are separated into separate devices, and each of them is connected to each other by a plurality of connecting pipes, so that the connection structure is very complicated and the vehicle The exhaust gas reducing device and the muffler casing have a simple cylindrical structure with low durability, so that cracks are generated or deformed on the welded part easily due to the vibration or impact of the vehicle during long-term use, thereby creating a purification process. There was a problem that the exhaust gas is not leaked to the outside to cause environmental pollution and increase the body noise.

The present invention is to solve the problems as described above to reduce the harmful gas and noise in one device by integrally equipped with the exhaust gas reduction device made of a catalytic converter inside the muffler, the overall assembly and welding is very It is designed to increase durability while being easily made, so that the overall exhaust noise is reduced even when the exhaust gas is continuously introduced into the inside, there are no cracks and deformations, and the exhaust gas with reduced harmful gas is smoothly discharged to the outside. The purpose is.

To achieve this purpose, a long cylindrical outer casing is mounted horizontally on the lower part of the vehicle and is welded with side plates fitted at left and right end portions thereof, and is inserted through and perpendicularly to the left side of the outer circumferential surface of the outer casing. The rounded curved surface is formed at the end so that the one end is simply welded from the outside through the curved surface welding hole perforated in the outer casing of the portion in close contact with the inner peripheral surface of the outer casing. An outer circumferential surface inserted into the inner side of the housing includes exhaust gas inlet pipes in which a plurality of exhaust holes are perforated as a whole, and a housing welded horizontally to an inner central portion of the outer casing in a cylindrical shape having open left and right sides. There are a number of soot through holes densely drilled in the A catalytic converter is provided with a fixed catalytic converter inserted into a cylindrical catalyst member for oxidation-reduction and removal of harmful gases from the gas, and an exhaust gas discharge pipe inserted into the center of the right side plate in a horizontal direction. Blocks with multiple vent holes perforated at right angles are fitted on the outer circumferential surface of the left end located inside the outer casing. The block plates are spaced apart from the right side plate at regular intervals. It is characterized in that the exhaust gas is composed of an exhaust gas discharge part which prevents the exhaust gas from flowing into the exhaust gas discharge pipe and being overloaded or reversed.

Hereinafter, the preferred configuration according to the present invention will be described in detail by the drawings.

The smoke reduction muffler 1 for a natural gas vehicle according to the present invention has a gaseous compressed natural gas (CNG) composed of methane gas (CH ₄ ) as a main component as shown in FIGS. 1 to 5. It is connected to the exhaust manifold 10 of the engine 9 of the exhaust device of the natural gas vehicle to reduce the harmful gas and exhaust noise contained in the exhaust gas in one device. Oxidative reduction and purification of the long cylindrical outer casing (2), the exhaust gas inlet pipe (5) connected to the front pipe (11) of the exhaust manifold (10), and the harmful gases in the introduced exhaust gas A catalytic converter 14 to be processed and an exhaust gas discharge unit 19 for smoothly exhausting the exhaust gas while blocking a large amount of exhaust gas from flowing in and overflowing at the same time.

The outer casing 2 is integrally welded with the side plates 3a and 3b fitted to the left and right end portions of the left and right sides which are opened in a long cylindrical shape as shown in FIGS. 1 to 3 and 5, respectively. The side plates 3a and 3b are rounded convexly to the outside, so that the impact due to the exhaust pressure of the exhaust gas introduced into the outer casing 2 is influenced by the left and right side plates ( When delivered to 3a) and 3b, the shock is alleviated by the side plates 3a and 3b that are convexly rounded to the outside, thereby reducing exhaust noise and increasing durability of the outer casing 2. On the outer circumferential surface of the side plates 3a and 3b, weld protrusions 4a and 4b having a predetermined length in the outer right angle direction are integrally formed so that the outer ends of the weld protrusions 4a and 4b are formed. The outer peripheral surfaces of the left and right ends of the outer casing 2 are easily in contact with each other. Both side plates 3a and 3b are each welded at a predetermined interval inwardly of the outer casing 2 by welding protrusions 4a and 4b protruding to a predetermined length as described above. Side plates 3a and 3b are welded to the outer casing 2 in a more rigid state while maintaining the fitted state, and the durability is further increased, and cracks are generated or deformed at the welded part even during long-term use, causing gaps. It is not supposed to be.

The exhaust gas inlet pipe 5 has a long cylindrical tube shape as shown in FIGS. 1 to 3 and 5 so as to penetrate at right angles to the left side of the outer circumferential surface of the outer casing 2. A curved surface 6 rounded outward is formed at one end and is curved to have a small diameter perforated in the outer casing 2 of the portion in close contact with the curved surface 6 while being in close contact with the inner circumferential surface of the outer casing 2. One side end of the exhaust gas inlet pipe 5 is simply welded to the outside of the outer casing 2 through the surface welding hole 7. However, a conventional exhaust gas reducing device or a muffler is attached to the outer casing 2. When assembling the exhaust gas inlet pipe 5, one end of the exhaust gas inlet pipe 5 is cut and molded to be rounded with the inner circumferential surface of the outer casing 2, and then the outer circumferential surface of one end of the exhaust gas inlet pipe 5 is assembled. And the inner circumferential surface of the outer casing (2) abut In the inner casing (2) to be welded in the cutting and welding process is very difficult and takes a lot of time, but in the present invention to solve the above problems in the exhaust gas inlet pipe (5) The curved surface 6 was formed and the outer casing 2 was designed to be easily welded by drilling the curved surface welding hole 7.

In addition, the exhaust gas inlet pipe 5 has a plurality of cutouts 8a formed along the outer circumferential surface at the other end thereof, so that the exhaust manifold 10 of the engine 9 connected to the other end of the exhaust gas inlet pipe 5. The front pipe 11 from) is easily fitted into the other end of the exhaust gas inlet pipe 5, and is tightened by tightening a portion where the cutout groove 8a is formed from the outside with the conventional fastening clamp 12a. The exhaust gas inlet pipe 13 is formed on the outer circumferential surface of the exhaust gas inlet pipe 5 inserted into the outer casing 2 so that the exhaust gas introduced from the engine is maintained. Dispersion is carried out through the plurality of exhaust holes 13 and is evenly ejected to the inside of the outer casing (2).

The catalytic converter 14 is provided with a housing 15 which is horizontally located in the inner center portion of the outer casing 2 in a cylindrical shape in which the left and right sides are open as shown in FIGS. Inside the housing 15, a cylindrical catalyst member 17 having a plurality of soot through holes 16 densely perforated in a honeycomb shape is inserted and fixed to the housing 15. Flow preventing jaws 18a and 18b are protruded around the inner circumferential surface, respectively, so that the catalyst member 17 inserted and fixed inside is kept firmly fixed without moving during vibration and shock caused by driving of the vehicle. In addition, the catalyst member 17 is formed of a metal or ceramic material with a size corresponding to the inner diameter of the housing 15, and is provided on the inner circumferential surface of the plurality of soot through holes 16 which are densely perforated in a honeycomb shape. There is such as platinum or palladium each processed entirely coated by redox the harmful gases in the hydrocarbon, carbon monoxide and nitrogen oxides in the exhaust gas is switched to discharge the water vapor and carbon dioxide, and nitrogen gas or the like.

The exhaust gas discharge unit 19 is provided with an elongated cylindrical tubular exhaust gas discharge pipe 20 inserted through the horizontal direction in the center of the right side plate 3b as shown in FIGS. The left end of the exhaust gas discharge pipe 20 is located inside the outer casing 2, and the right end is located outside the outer casing 2, and the blocking plate 21 is erected at right angles to the outer peripheral surface of the left end. The welding plate is attached in the fitted state, but the blocking plate 21 is a ring-shaped plate whose inner diameter corresponds to the outer diameter of the exhaust gas discharge pipe 20 and the outer diameter corresponds to the inner diameter of the outer casing 2. It is installed and spaced apart from the right side plate (3b) by a predetermined interval and a plurality of vent holes 22 are perforated part of the exhaust gas introduced through the catalytic converter 14 is discharged through the exhaust gas discharge pipe (20) And some of the rest Each vent hole 22 of the blocking plate 21 circulates the space between the blocking plate 21 and the right side plate 3b to be discharged through the exhaust gas discharge pipe 20 smoothly by a predetermined amount. When a large amount of exhaust gas flows into the exhaust gas discharge pipe 20 through the soot through hole 16 of the catalyst member 17, it is prevented from being overloaded or reversed beyond the capacity of the exhaust gas discharge pipe 20. In addition, the blocking plate 21 has a convex rounded shape toward the portion where the right side plate 3b is formed so that the impact plate caused by the exhaust pressure of the exhaust gas passing through the catalyst member 17 is convexly rounded. The exhaust noise is reduced while being alleviated by (21), and the support protrusion jaw 23 having a predetermined length is formed on the outer circumference thereof so that the support protrusion 23 is easily formed on the inner circumferential surface of the outer casing 2. We are attached to car The left end of the plate 21 an exhaust gas discharge pipe 20 is disposed through the center portion (介 在) of the support is adapted to more firmly fixed.

On the other hand, the exhaust gas discharge pipe 20 has a plurality of incision grooves (8b) is formed along the outer peripheral surface at the right end of the exhaust pipe 24 connected to the right end of the exhaust gas discharge pipe 20 is the exhaust gas discharge pipe (20) It is to be easily fitted into the right end of the inner side) and by tightening the portion formed with the cutting groove (8b) from the outside with a conventional fastening clamp (12b) to maintain a tightly coupled state.

If necessary, the smoke reduction muffler 1 of the present invention can be installed in a general diesel vehicle as well as a natural gas vehicle.

Hereinafter, the action according to the present invention is as follows.

The soot reduction muffler 1 for a natural gas vehicle of the present invention is connected to the front pipe 11 connected to the exhaust manifold 10 of the engine 9 of the vehicle exhaust system as shown in FIG. The exhaust gas from the exhaust gas from the exhaust gas 24 to be discharged to the outside in the state of reducing exhaust noise while purifying harmful particulates (harmful gases) such as particulate matter, carbon monoxide, hydrocarbons, nitrogen oxides, The exhaust gas generated from the engine 9 flows into the inside of the outer casing 2 while being dispersed through the plurality of exhaust holes 13 drilled in the exhaust gas inlet pipe 5, and the inner middle portion of the outer casing 2. Harmful particulates such as particulate matter, carbon monoxide, hydrocarbons and nitrogen oxides from the engine 9 while passing through a plurality of soot through holes 16 densely formed in the catalyst member 17 of the catalytic converter 14 located in the Noxious gas) And purified by carbon dioxide, water vapor, nitrogen gas, and the like, and some of the exhaust gases having reduced harmful gases are smoothly discharged to the outside through the exhaust gas discharge pipe 20, and the remaining exhaust gases are exhaust gas discharge units 19. It is circulated while being distributed through a plurality of vent holes 22 formed in the blocking plate 21 to prevent a large amount of exhaust gas from being temporarily discharged to the exhaust gas discharge pipe 20 at one time to prevent overloading or backflow. At the same time, the exhaust noise is reduced while the shock caused by the exhaust pressure of the exhaust gas continuously introduced into the outer casing 2 by the side plates 3a and 3b and the blocking plate 21 rounded convexly to the outside is alleviated. Is discharged to the outside through the exhaust pipe 24 connected to the right end of the exhaust gas discharge pipe 20 in the opened state.

As described above, the present invention is equipped with an exhaust gas reduction device made of a catalytic converter inside the muffler to reduce the harmful gas and noise together in one device, and the exhaust gas inlet inserted into the outer casing at a right angle. The pipe can be easily welded through the curved surface and the curved surface welding hole, and the overall exhaust noise is prevented even by the impact of the exhaust gas continuously introduced by the left and right side plates and the blocking plate of the outer casing which are convexly rounded outward. Reduced and increased durability, there is no cracking and deformation, and the large amount of exhaust gas is smoothly circulated without being discharged to the exhaust gas discharge pipe at the same time by the vent hole of the blocking plate so that the exhaust noise is further reduced. There is.

Claims (4)

Long cylindrical outer casing 2 mounted horizontally on the lower part of the vehicle and welded with side plates 3a and 3b fitted to the left and right side ends, respectively, and on the left side of the outer circumferential surface of the outer casing 2. A curved surface 6 which is inserted through at right angles and rounded outward is formed at one end thereof so as to be in close contact with the inner circumferential surface of the outer casing 2 and to be perforated in the outer casing 2 in close contact with the curved surface 6. One end is easily welded from the outside through the curved curved surface welding hole 7 and the exhaust gas inlet pipe is formed on the outer circumferential surface inserted into the outer casing 2 as a whole. (5) and a housing 15 which is horizontally welded and attached to the inner central portion of the outer casing 2 in a cylindrical shape with open left and right sides, and a plurality of soot through holes in the housing 15. 16) This densely perforated And a catalytic converter 14 into which a cylindrical catalyst member 17 for purifying by oxidizing and reducing the harmful gas introduced therein is inserted into the center of the right side plate 3b. Discharge pipe 20 is provided and the exhaust gas discharge pipe 20 is a state in which a plurality of vent holes 22 perforated blocking plate 21 is erected at right angles on the outer peripheral surface of the left end located inside the outer casing (2) The blocking plate 21 is positioned to be spaced apart from the right side plate 3b by a predetermined distance so that a large amount of exhaust gas flows into the exhaust gas discharge pipe 20 at one time and is overloaded. A smoke reduction muffler for a natural gas vehicle, comprising: an exhaust gas discharge unit 19 configured to block backflow. The side plates (3a) (3b) are each convexly rounded outward so that the impact due to the exhaust pressure of the exhaust gas introduced into the outer casing (2) is left and right side plates ( When it is delivered to 3a) and 3b, exhaust noise is reduced while the shock is alleviated by the side plates 3a and 3b which are convexly rounded to the outside, and the outer peripheral surface of the side plates 3a and 3b is outside. The welding protrusions 4a and 4b having a predetermined length in the right angle direction are integrally formed so that the outer ends of the welding protrusions 4a and 4b and the outer peripheral surfaces of the left and right ends of the outer casing 2 abut each other. A smoke reduction muffler for a natural gas vehicle, which is characterized in that it is easily welded in a state. 2. The shielding plate (21) according to claim 1, wherein the blocking plate (21) is a ring-shaped plate that is convexly rounded toward the portion where the right side plate (3b) is formed, so that the impact due to the exhaust pressure of the exhaust gas passing through the catalyst member (17) is reduced. Exhaust noise is reduced while being mitigated by the convexly rounded blocking plate 21. A support protrusion jaw 23 having a predetermined length is formed on the outer circumferential surface thereof to support the protrusion protrusion on the inner circumferential surface of the outer casing 2. As shown in FIG. (23) is easily welded and attached, while the lower end of the exhaust gas discharge pipe 20 interposed in the middle portion of the blocking plate 21, the smoke soot muffler for natural gas vehicles, characterized in that to be fixed firmly. The exhaust gas inlet pipe (5) and the exhaust gas discharge pipe (20) is a plurality of incisions along the outer circumferential surface at the other end of the exhaust gas inlet pipe (5) and the right end of the exhaust gas discharge pipe (20), respectively. The grooves 8a and 8b are formed so that the front pipe 11 and the exhaust pipe 24 are easily fitted into the exhaust gas inlet pipe 5 and the exhaust gas discharge pipe 21, respectively. A low noise muffler for natural gas vehicles, characterized in that the fastening clamps (12a) (12b) to maintain a tightly coupled state by tightening a portion formed in the cutting groove (8a) (8b) from the outside.

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