CN214247470U - Exhaust system for internal combustion engine - Google Patents

Abstract

The utility model aims at providing an exhaust system (500) for internal-combustion engine. The exhaust system (500) includes an inlet pipe (100), an aftertreatment unit (200), and an outlet pipe (300). The inlet tube (100) includes an upper portion (110), a middle portion (120), and a lower portion (130). The upper portion (110) and the lower portion (130) have apertures for directing and directing exhaust gas flow toward the aftertreatment unit (200). Furthermore, the cross-sectional area of the middle portion (120) of the inlet pipe (100) is smaller than the cross-sectional areas of the upper portion (110) and the lower portion (130) to promote uniform flow distribution of the exhaust gas to the aftertreatment unit (200). The present invention adds sufficient swirl/turbulence to the exhaust flow entering the exhaust system (500) so that the airflow distribution over the surface of the substrate (210) is uniform, especially for radial inlet systems.

Description

Exhaust system for internal combustion engine

Technical Field

The utility model relates to an exhaust system for internal-combustion engine. More specifically, the present invention relates to a radial exhaust system for an internal combustion engine.

Background

An engine exhaust system directs exhaust gas from the engine and discharges it to the environment. When discharged to the environment, the system can reduce noise and prevent environmental pollution after the exhaust gas is treated. A typical exhaust system may include an inlet pipe, an aftertreatment unit, and an outlet. The aftertreatment unit may include a substrate disposed within a housing of the exhaust system. Furthermore, the flow distribution of the exhaust gas plays a crucial role in the after-treatment of the exhaust gas in order to prevent the emission of toxic substances to the environment. If the gas flow is evenly distributed throughout the exhaust system, the substrate is able to reduce the exhaust gases to less toxic substances in a more efficient manner by catalytic chemical reactions.

Furthermore, sufficient swirl/turbulence is added to the exhaust gas flow entering the system so that the gas flow distribution over the substrate surface should be uniform, especially for radial inlet systems. Placing the perforated plate/tube upstream of the substrate is a conventional approach, but has limitations in distributing the gas flow over the upper half of the substrate, particularly for radial inlet systems.

Accordingly, there is a need for an exhaust system for an internal combustion engine that overcomes some or all of the disadvantages of existing radial exhaust systems.

Purpose of the utility model

The utility model aims at providing an exhaust system for internal-combustion engine.

It is another object of the present invention to provide an exhaust system for an internal combustion engine that promotes uniform flow distribution of exhaust gases.

It is another object of the present invention to provide an exhaust system for an internal combustion engine that adds sufficient swirl/turbulence to the flow of exhaust gas entering the system so that the gas flow distribution over the surface of the substrate should be uniform, particularly for radial inlet systems.

It is another object of the present invention to provide an exhaust system for an internal combustion engine that is economical and robust in construction.

SUMMERY OF THE UTILITY MODEL

According to the utility model discloses, provide an exhaust system for internal-combustion engine. In the present embodiment, the exhaust system is a radial exhaust system. The exhaust system includes an inlet pipe, an aftertreatment unit, and an outlet pipe. The inlet pipe receives a flow of exhaust gas from a combustion chamber of the internal combustion engine to an exhaust system. The exhaust system prevents the release of toxic substances to the environment by purifying the exhaust gases from the combustion chamber. The aftertreatment unit includes a substrate disposed within a housing of the exhaust system. Substrate 210 is a Diesel Oxidation Catalyst (DOC).

In this embodiment, the aftertreatment unit includes a Diesel Particulate Filter (DPF), a Selective Catalytic Reduction (SCR) catalyst chamber, and a mixing chamber. The inlet pipe is arranged transverse to the exhaust housing such that exhaust gas flow into the exhaust system is perpendicular to the axis of the substrate disposed therein. The inlet pipe ensures sufficient turbulence for the exhaust gas flow entering the exhaust system, thereby making the gas flow distribution uniform over the substrate surface. In this embodiment, the inlet tube includes an upper portion, a middle portion, and a lower portion. The upper and lower portions have apertures for directing and directing the exhaust gas stream toward the aftertreatment unit. In this embodiment, the cross-sectional area of the middle portion of the inlet pipe is smaller than the cross-sectional areas of the upper and lower portions. Specifically, the outlet end of the upper portion of the inlet tube forms a convergent section and the inlet end of the lower portion of the inlet tube forms a divergent section for defining the middle of the inlet tube as a venturi gap. The venturi gap promotes uniform gas flow distribution of the exhaust gas flowing from the upper and lower apertures of the inlet tube to the aftertreatment unit.

The reduced cross-section of the middle section or venturi gap controls the flow of exhaust gas into the inlet tube to promote uniform flow distribution of exhaust gas to the aftertreatment unit. The velocity of the exhaust flow increases at the venturi gap, which allows the exhaust flow to pass from the upper portion to the lower portion and evenly disperses the exhaust gas through the various apertures.

Drawings

The advantages and features of the present invention will be better understood with reference to the following detailed description and claims taken in conjunction with the accompanying drawings, in which like elements are identified with like reference numerals, and in which:

fig. 1 shows a schematic view of an exhaust system for an internal combustion engine according to the present invention;

FIG. 2 shows a perspective view of FIG. 1;

FIG. 3 shows a schematic view of the arrangement of the inlet pipe inside the exhaust system; and

figure 4 shows the flow distribution of the exhaust gases from the inlet pipe inside the exhaust system.

Detailed Description

Embodiments showing features of the present invention will now be described in detail. The terms "comprising," "having," "containing," and "containing," as well as other forms of the terms, are synonymous and open-ended, in that an item or items following any one of these terms does not mean an exhaustive list of the item or items, or is limited to only the item or items in the list.

The terms "first," "second," and the like, herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, and the terms "a" and "an" herein do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.

The disclosed embodiments are merely examples of the invention, which may be embodied in various forms.

Referring to fig. 1 and 2, an exhaust system 500 for an internal combustion engine according to the present invention is shown. In the present embodiment, the exhaust system 500 is a radial exhaust system as shown in FIG. 1. The exhaust system 500 includes an inlet pipe 100, an aftertreatment unit 200, and an outlet pipe 300. The inlet pipe 100 receives a flow of exhaust gas from a combustion chamber (not shown) of the internal combustion engine to an exhaust system 500. The exhaust system 500 prevents the release of toxic substances to the environment by purifying exhaust gases from the combustion chamber.

The aftertreatment unit 200 includes a substrate 210 disposed within a housing 510 of the exhaust system 500. The substrate 210 captures solid particles from the exhaust gas, thereby reducing the exhaust gas to less toxic substances through catalytic chemical reactions. In the present embodiment, substrate 210 is a Diesel Oxidation Catalyst (DOC).

By way of non-limiting example, the aftertreatment unit 200 further includes a Diesel Particulate Filter (DPF)220, a Selective Catalytic Reduction (SCR) catalyst chamber 230, and a mixing chamber 240. The substrate 210 captures solid particles and is oxidized with an oxidation catalyst. The diesel particulate filter 220 then reduces the diesel particulate matter or soot from the exhaust. Further, the exhaust gas after the purification treatment from the mixing chamber 240 and the selective catalytic reduction chamber 230 in the exhaust system 500 is discharged to the environment.

Referring now to fig. 3 and 4, exhaust housing 510 has an opening 510a that allows inlet tube 100 to be partially disposed within exhaust housing 510. Specifically, the inlet tube 100 is disposed transverse to the exhaust housing 510 such that the exhaust gas flow entering the exhaust system 500 is perpendicular to the axis of the substrate 210 disposed therein. The substrate 210 is disposed adjacent to the inlet tube 100 within the exhaust housing 510. The inlet tube 100 ensures sufficient swirl/turbulence for the exhaust gas entering the exhaust system 500 so that the gas flow distribution over the surface of the substrate 210 is uniform.

In this embodiment, inlet tube 100 includes an upper portion 110, a middle portion 120, and a lower portion 130. The upper portion 110 and the lower portion 130 have holes for directing and directing the exhaust gas flow toward the aftertreatment unit 200. The upper portion 110 has an outlet end to direct the exhaust gas flow to the lower portion 130, and the lower portion 130 has an inlet end to receive the gas flow from the upper portion 110. In this embodiment, the cross-sectional area of the middle portion 120 of the inlet tube 100 is smaller than the cross-sectional areas of the upper portion 110 and the lower portion 130. Specifically, the outlet end of the upper portion 110 of the inlet tube 100 forms a converging section 118 and the inlet end of the lower portion 130 of the inlet tube 100 forms a diverging section 128 for defining the middle portion 120 of the inlet tube 100 as a venturi gap 138, as shown in FIG. 3. Venturi gap 138 promotes uniform gas flow distribution of exhaust gas flowing from the apertures of upper portion 110 and lower portion 130 of inlet tube 100 to aftertreatment unit 200.

Referring to FIG. 4, the reduced cross-section of middle portion 120 or venturi gap 138 controls the flow of exhaust gas into inlet tube 100 to promote even distribution of exhaust gas to aftertreatment unit 200. The velocity of the exhaust flow increases at the venturi gap 138, which allows the exhaust flow to pass from the upper portion 110 to the lower portion 130 and evenly disperse the exhaust through the various apertures. The venturi gap 138 allows a certain amount of airflow through the upper half of the substrate 210, and the remaining airflow is dispersed at the lower half of the substrate 210 through the holes in the lower portion 130 to create a uniform airflow distribution over the entire surface of the substrate 210.

Specifically, the upper portion 110 of the inlet tube 100 has holes that allow the exhaust gas flow to be dispersed in the upper half of the substrate 210, and similarly in the lower portion 130.

Accordingly, the present invention has the advantage of providing an exhaust system 500 for an internal combustion engine, which exhaust system 500 promotes uniform flow distribution of the exhaust gas. The exhaust system 500 adds sufficient swirl/turbulence to the exhaust flow entering the exhaust system 500 so that the gas flow distribution over the surface of the substrate 210 is uniform, particularly for radial inlet systems. Furthermore, the exhaust system 500 is both economical and robust in construction.

The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It should be understood that various omissions and substitutions of equivalents are contemplated as circumstances may suggest or render expedient, but such omissions and substitutions are intended to cover the application or embodiment without departing from the scope of the claims of the present invention.

Claims (6)

1. An exhaust system (500) for an internal combustion engine, the exhaust system (500) comprising:

an inlet pipe (100) for receiving an exhaust gas flow from an engine, the inlet pipe (100) comprising an upper portion (110), a middle portion (120), and a lower portion (130), the upper portion (110) and the lower portion (130) having apertures for directing and directing the exhaust gas flow towards an aftertreatment unit (200);

characterized in that the cross-sectional area of the middle portion (120) of the inlet tube (100) is smaller than the cross-sectional areas of the upper portion (110) and the lower portion (130), which enables the middle portion (120) to control the flow of exhaust gas entering the inlet tube (100) to promote uniform flow distribution of exhaust gas to the aftertreatment unit (200).

2. The exhaust system (500) of claim 1, wherein an outlet end of the upper portion (110) of the inlet pipe (100) forms a converging section (118) and an inlet end of the lower portion (130) of the inlet pipe (100) forms a diverging section (128) for defining the middle portion (120) of the inlet pipe (100) as a venturi gap (138) to promote uniform flow distribution of the exhaust gas flowing from the apertures of the upper portion (110) and the lower portion (130) of the inlet pipe (100) to the aftertreatment unit (200).

3. The exhaust system (500) of claim 1, wherein the inlet pipe (100) is arranged transverse to an exhaust housing (510).

4. The exhaust system (500) of claim 1, wherein the aftertreatment unit (200) includes a substrate (210).

5. The exhaust system (500) of claim 1 or 4, wherein the apertures in the upper portion (110) of the inlet tube (100) allow exhaust gas flow to be dispersed over an upper half of the substrate (210) and the apertures in the lower portion (130) of the inlet tube (100) allow exhaust gas flow to be dispersed over a lower half of the substrate (210) to promote uniform gas flow distribution of exhaust gas to the aftertreatment unit (200).

6. The exhaust system (500) of claim 1, wherein the aftertreatment unit (200) comprises a Diesel Oxidation Catalyst (DOC), a Diesel Particulate Filter (DPF) (220), a Selective Catalytic Reduction (SCR) catalyst chamber (230), and a mixing chamber (240) as a substrate (210).

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