WO2015084281A1

WO2015084281A1 - A mixer pipe

Info

Publication number: WO2015084281A1
Application number: PCT/TR2014/000482
Authority: WO
Inventors: Hakan ALKAN; İsmail Hakkı SAVCI; Ender AKGUL; Ahmet Sinan KARTAL
Original assignee: Ford Otomotiv Sanayi Anonim Sirketi
Priority date: 2013-12-02
Filing date: 2014-12-02
Publication date: 2015-06-11
Also published as: DE112014005083T5

Abstract

The present invention relates a mixer pipe (1) which is mounted to the exhaust pipe and enables the exhaust gas to be mixed with air homogeneously, and characterized by -at least one pipe (2) through which the exhaust gas passes, which has inlet (21) through which the exhaust gas enters and outlet (22) through which the exhaust gas exits, -at least one guiding fin (5) which is located after the inlet (21), guides the exhaust gas and preferably divides into two parts, -at least one mixer (4) which is provided up from the guiding fin (5) and sprays the air into the pipe (2) by mixing.

Description

DESCRIPTION

A MIXER PIPE

Field of the Invention

The present invention relates to a mixer pipe which is connected to the exhaust pipe and enables the particles sprayed into the pipe to be mixed homogeneously with the exhaust gas. Background of the Invention

Some waste gases are produced as a result of the combustion in the internal combustion engines. Gases which are harmful for environment and human health are also present inside the waste gases produced as a result of combustion. It is forbidden and dangerous to directly release the gases harmful for environment and for human health from the vehicle exhaust. The harmful gases generated as a result of combustion are tried to be eliminated by being subjected to several stages such as filtering, re-combustion, enhancing combustion process. Therefore it is prevented that the harmful gases are directly released from the exhaust system and the emission values are decreased.

In order to reduce exhaust emission values, there are several embodiments for improving combustion function and increasing combustion quality. In some of these embodiments, air is given inside the exhaust system and the amount of oxygen is increases and thus combustion quality is improved. In recent years, especially for reducing the emission amount of heavy commercial vehicles, various catalysts (reducing¹ gases and/or liquids) are injected inside the exhaust system. Exhaust gas should be mixed homogeneously so that the injected gases and liquids can react with the exhaust gas effectively. In case adequate and efficient mixing cannot be provided, some part of the reducing liquid and gases are released without taking place in a chemical reaction. In this kind of embodiments, it is quite important that the exhaust gas inside the exhaust system is homogeneous. The more homogeneous the exhaust gas is in the exhaust system, the more efficient the reaction with the catalysts will be. In this kind of embodiments, it is a very important detail and a technical problem that the exhaust gas moves homogeneously inside the system. Because, when the exhaust gas is not homogeneous, adequate efficiency cannot be obtained from the air; gas and reducers injected into the system, and the emission levels cannot be reduced to desired levels. The exhaust gas going out of the engine is not carried outside with straight pipes in the exhaust systems. The components and the pipes used in the exhaust system are placed in suitable placed according to the vehicle body design. The design of exhaust system pipes is made according to the locations of the pipes and the equipment such as injectors mounted to the pipes, the design of the body and the other components. For this reason, there are turns in the pipes, decreases and increases in diameters present in the exhaust systems.. The changes in the exhaust system pipes directly affect the gas flow and the homogeneity of the exhaust gas.

There are several applications for reducing emission values of the gases generated as a result of combustion and for reducing gas output by increasing combustion quality in our day.

European Patent Document no EP1982756 (Al), an application known in the state of the art, discloses an exhaust system of an internal combustion engine. The exhaust system comprises an exhaust pipe, an exhaust manifold, an oxidizing catalyst, catalytic system and an injection device. The injection device injects reducing additive to the exhaust pipe. The device has a tubular body, and it has a plurality of fins in its structure. The said patent document does not disclose a pipe that can be included into the exhaust system and a mechanical structure for making the exhaust gas flow homogeneous with the said pipe. Korean Patent Document no KR101230417 (Bl), an application known in the state of the art, discloses an apparatus which prevents vortex and reduces the nitrogen oxide in the exhaust gas. The apparatus comprises an exhaust pipe, an injector, an EGR line, an inflow guide vane, and a discharge guide vane. The catalyst unit is mounted on the middle part of the exhaust pipe. The injector injects the reducing additive to the catalyst unit. EGR line recirculates the exhaust gas from the catalyst unit to the front end of the injector. The said patent document does not disclose a pipe which can be included into the exhaust system and which has the structure for making the exhaust gas flow homogeneous. Furthermore, the said patent document does not disclose a pipe structure which sprays air mixed into the exhaust system.

In the current applications, an angular pipe which can be included into the exhaust system and making the gas flow homogeneous with the mechanical equipment present inside the pipe structure are not disclosed. In the present applications, an air flow mixed to the system with a pipe included into the exhaust system is not provided.

The Objective of the Invention

The objective of the present invention is to provide a mixing pipe which is mounted to a place inside the exhaust system preferably before the injector and which is for reducing the gas emission. Another objective of the present invention is to provide a mixing pipe which reduced the gas emission value by making the exhaust gas flow homogeneous.

Yet another objective of the present invention is to provide a mixing pipe which has angular turn in one part of the exhaust pipe. A further objective of the present invention is to provide a mixing pipe which sprays the mixed air or liquid to the gas inside the exhaust pipe.

Another objective of the present invention is to provide a mixing pipe which prevents the exhaust gas from accumulating inside the pipe and the exhaust gas from hitting to the injector directly.

A further objective of the present invention is to provide a mixing pipe which enables the particles -injected to the exhaust system to be mixed well with the exhaust gas.

Summary of the Invention

A mixer pipe which is defined in the first system and the other claims dependent to this claim developed to fulfill the objective of the present invention is mounted on the exhaust pipe before the injector. The exhaust gas passes through the mixer pipe. The inlet and the outlet of the mixer pipe are not located on the same axis, there is an angular turn between the inlet and the outlet. There is a guiding piece preferably in the plaqe where the angular turn is present, up from the inlet. The guiding piece remains angular inside the inlet pipe, therefore the exhaust gas is guided where it is desired. There are preferably small holes on the guiding piece. After the exhaust gas passes the inlet, it comes to the guiding piece and some part of the gas passes through the piece while the other part is guided. The mixer and the injector are located right above the place where the guiding piece is provided. By means of the mixer, the air is mixed and sprayed into the pipe. The mixed air is mixed with the homogenized exhaust gas inside the pipe, and thus a qualified catalyst and combustion is realized.

Detailed Description of the Invention A mixer pipe developed to fulfill the objectives of the present invention is illustrated in the accompanying figures, in which:

Figure 1 is the perspective view of the mixer pipe.

Figure 2 is the perspective view showing the exhaust gas passing through the mixer pipe.

The components shown in the figures are each given reference numbers as follows:

1. Mixer pipe

2. Pipe

21. Inlet

22. Outlet

3. Mounting piece

4. Mixer

5. Guiding fin

6. Hole

7. Injector

A mixer pipe (1) which is mounted to the exhaust pipe and enables the exhaust gas to be mixed with the air homogeneously comprises

-at least one pipe (2) through which the exhaust gas passes, which has inlet (21) through which the exhaust gas enters and outlet (22) through which the exhaust gas exits,

-at least one guiding fin (5) which is located after the inlet (21), guides the exhaust gas and preferably divides into two parts,

-at least one mixer (4) which is provided up from the guiding fin (5) and sprays the air into the pipe (2) by mixing.

The inventive mixing pipe (1) is connected to the exhaust pipe before the injector. The gas generated as a result of combustion in the engine is drawn with exhaust manifold and it is discharged out of the vehicle with the exhaust system. Emission values are reduced before discharging the gas generated as a result of combustion. The mixing pipe (1) is mounted inside the exhaust system in order to reduce the emission of exhaust gas. The exhaust gas enters into the pipe (2) through the inlet (21) and exits through the outlet (22). In the preferred embodiment of the invention, the inlet (21) and the outlet (22) are not located on the same axis. A bending is provided between the inlet (21) and the outlet (22) on the pipe (2) by forming an angle. By means of the bending on the pipe (2), packing is performed easily and advantageously. The angle is provided on a preferred point on the pipe (2) between the inlet (21) and the outlet (22). The angle enables the pipe (2) to be bent in a preferred ratio and enables the inlet (21) and the outlet (22) to be on different axis. The flow rate and the speed of the gas can be controlled by changing the bending angle on the pipe (2). The bending angle on the pipe (2) can be in different forms and angles. In the preferred embodiment of the invention, the bending angle of the pipe (2) is between 30-90 °.

In the inventive mixer pipe (1), there is at least one mounting piece (3) preferably on the place where the pipe (2) bending is present that is on the place where the pipe (2) angle is formed. The mounting piece (3) is on the pipe (2) preferably where the angle is present. The mounting piece (3) enables the mixer (4) to be mounted on the pipe (2)

In the inventive mixer pipe (1), the exhaust gas flow is from the inlet (21) towards the outlet (22). There is at least one guiding fin (5) inside the pipe (2) after the inlet (21) preferably where the pipe (2) angle is provided. The guiding fin (5) is preferably smaller than the diameter of the pipe (2) and it is open towards the flow direction of the exhaust gas. (Figure 1) he guiding fin (5) narrows the diameter of the pipe (2) through which the exhaust gas passes, and guides the exhaust gas since it remain open towards the flow direction of the gas. In a preferred embodiment of the invention, there are holes (6) provided on the guiding fin (5). The holes (6) are provided on parts of the guiding fin (5) where it is preferred, and the surface apart from the holes (6) has a closed structure. Therefore, when the exhaust gas comes to the guiding fin (5), some part of the exhaust gas passes the guiding fin (5), and the other part of the exhaust gas hits to the guiding fin (5), and moves according to the angle of repose of the fin (5) inside the pipe (2). Therefore, the exhaust gas is divided into two with the guiding fin (5) and the exhaust gas passing through the fin (5) is mixed. The exhaust gas passing through the holes (6) on the fin (5) is provided with a movement preferably in shape of a spiral and the exhaust gas is mixed with this movement. In the preferred embodiment of the invention, the guiding fin (5) is mounted and fixed inside the pipe (2). In this embodiment, when the exhaust gas hits the guiding fin (5), it is divided into two relative to the fixing angle of the fin (5). Therefore the exhaust gas is divided into two and the exhaust gas is directed by means of the fin (5). In an alternative embodiment of the invention, the guiding fin (5) is movable. The guiding fin (5) moves according to the axis of the pipe (2). The movement of the guiding fin (5), that is opening as the exhaust gas hits, is provided with the pressure of the exhaust gas. The guiding fin opens more when there is dense exhaust gas flow, while the fin (5) starts closing as the exhaust gas passage decreases. In another alternative embodiment of the invention, the guiding fin (5) opens in stages. The guiding fin can change only a few levels according to the pressure values, and it opens by moving between these levels.

In the inventive mixer pipe (1), the guiding fin (5) guides the gas flow and divides the gas flow into two. The gas divided by means of the guiding fin (5) is mixed and the exhaust gas is enabled to be homogeneous. In the preferred embodiment of the invention, the guiding fin (5) is shape of a semi-circle and there are holes (6) provided on the guiding fin (5). In the alternative embodiment of the invention, the guiding fin (5) can be in different shapes and sizes.

In the inventive mixer pipe (1), the mixer (4) is mounted on the mounting piece (3). The mixer (4) preferably comprises at least one air intake and at least one injector (7). The injector (7) is preferably fixed such that it will face inside the pipe (2), and it enables spraying. Air enters through the air intake inside the mixer (4). The air inside the mixer (4) is mixed well, and sprayed inside the pipe (2) with the injector (7). The air sprayed from the injector (7) is combined with the exhaust gas which is mixed, and it becomes an ideal and homogeneous mixture. Therefore, the exhaust gas moving inside the pipe (2) is mixed with air. In the inventive mixer pipe (1), the exhaust gas and the air are mixed separately, and then they are combined. Therefore, the exhaust gas and air mixture has the ideal value. In the preferred embodiment of the invention, the guiding fin (5) is on the pipe (2) where the angle is formed and before the injector (7). Therefore, the exhaust gas first hits to the guiding fin (5) before hitting to injector (7). The guiding fin (5) also protects the injector (7) as well as it mixes the exhaust gas by diving into two. By means of the guiding fin (5), the particles in the exhaust gas are prevented from directly hitting the injector (7) and the operation time of the injector (7) elongates. If the guiding fins (5) are movable, they remain in more vertical and lower position in low flowrate. By means of the holes (6) on the guiding fins (5), the distribution of exhaust gas is improves, and the injected liquid is enabled to be degraded. It is also provided that the exhaust gas is guided according to the spraying angle of the injector (7). By this means the sprayed particles are prevented from hitting the exhaust walls. In an alternative embodiment of the invention, liquid is also sprayed through the injector (7) together with the air. In this embodiment, reducing exhaust gas emission is performed inside the mixer pipe (1). In this embodiment, exhaust gas moves inside the pipe (2). Liquid is injected through the injector (7) at the time when the exhaust gas is present therein. The liquid injected through the injected (7) is degraded by means of the exhaust gas passing through the holes (6). The guiding fin (5) enables the exhaust gas to be guided while passing through the pipe (2), and prevents the injected liquids from hitting to the exhaust wall. Furthermore, the movement of the fin (5) changes according to the flow rate when the fin (5) is movable. The inventive mixer pipe (1) is mounted inside the exhaust system. The exhaust gas enters through the inlet (21) of the pipe (2). The pipe (2) is angular (bent) preferably between 30-90 ⁰ between the inlet (21) and the outlet (22). The mounting piece (3) is provided on the angular part of the pipe (2), and the mixer (4) is provided on the mounting piece (3). The air intake and injector (7) are provided on the mixer (4). There is a guiding fin (5) inside the pipe (2) before the injector (7). The exhaust gas is divided into two with the guiding fin (5), and it is guided in a preferred way. The guiding fin (5) also mixes the exhaust gas, as well as it protects the injector (7). It mixes the air inside the mixer (4) well and sprays inside the pipe (2) with the injector (7). The particles are prevented from sticking to the pipe (2) and exhaust wall in the place where the injector (7) carries out spraying. Therefore the exhaust gas is homogeneously mixed with air, and an ideal mixture is obtained.

Claims

1. A mixer pipe (1), which is mounted to the exhaust pipe and enables the exhaust gas to be mixed with the air homogeneously, characterized by

2. A mixer pipe (1) according to claim 1, characterized by inlet (21) and outlet (22) which are not provided on the same axis on the pipe (2).

3. A mixer pipe (1) according to claim 1, characterized by pipe (2) on which an angle is provided by making a bend between the inlet (21) and the outlet (22).

4. A mixer pipe (1) according to claim 1, characterized by pipe (2) the bending angle on which is between 30-90 °

5. A mixer pipe (1) according to claim 1 , characterized by mounting piece (3) which enables the mixer (4) to be mounted and which is preferably provided on the place where the pipe (2) bending is present, that is on the place where the pipe (2) angle is formed.

6. A mixer pipe (1) according to claim 1, characterized by guiding fin (5) which is preferably provided on the place where the pipe (2) angle is present after the inlet (21) inside the pipe (2).

7. A mixer pipe (1) according to claim 1 , characterized by guiding fin (5) which is preferably smaller than the pipe (2) diameter and provided in an open way towards the exhaust gas flow.

8. A mixer pipe (1) according to claim 1 , characterized by guiding fin (5) on which holes (6) are provided where it is preferred and the surface of which apart from the holes has a closed structure.

9. A mixer pipe (1) according to claim 1, characterized by guiding fin (5) which passes some of the exhaust gas and guides the other part of the exhaust gas inside the pipe (2) according to the angle of repose.

10. A mixer pipe (1) according to claim 1, characterized by guiding fin (5) which provides a movement preferably in a spiral form mixing the exhaust gas passing through the holes (6) thereon.

1 1. A mixer pipe (1) according to claim 1, characterized by guiding fin (5) which moves according to the axis of the pipe (2) and which opens as the exhaust gas hits.

12. A mixer pipe (1) according to claim 1, characterized by mixer (4) which makes the air therein homogeneous by mixing it, and comprises at least one air intake and at least one injector (7).

13. A mixer pipe (1) according to claim 1, characterized by mixer (4) which homogeneously mixes the air and sprays into the pipe (2) preferably with the injector (7) thereon.

14. A mixer pipe (1) according to claim 1, characterized by injector (7) which enables the injected particles to enter into the exhaust system together with the exhaust gas.

15. A mixer pipe (1) according to claim 1, characterized by hole (6) which is provided in the guiding fin (5) and improves the gas distribution, and enables the injected liquid to be disintegrated.