KR101309138B1 - Device for injecting fuel for exhaust gas purifying apparatus - Google Patents

Abstract

Simplify the structure to increase assembly and maintenance efficiency, and to make the device more compact to increase the mountability to the vehicle, the exhaust pipe connected to the engine exhaust line to inject fuel into the exhaust gas flowing into the smoke reduction device In the fuel injector of the gas soot reduction device, the fuel injector is a fuel container installed on the base member, a cover block is installed on the open upper end of the fuel container to seal the fuel container, installed in the cover block to inject fuel A fuel injection unit, a fuel supply unit installed in the fuel container to supply fuel from the fuel container to the fuel injection unit, and an air supply unit installed in the base member to supply air to the fuel injection unit, and the cover block has a fuel container inside Fuel is transferred by connecting the inflow and discharge paths through which fuel is distributed and connecting the fuel supply unit and the fuel injection unit. Provides a fuel injection device of an exhaust gas emission control systems of the structure it is to supply an integrally formed.

Description

Fuel injector of exhaust gas soot reduction device {DEVICE FOR INJECTING FUEL FOR EXHAUST GAS PURIFYING APPARATUS}

The present invention relates to a smoke reduction device for a diesel vehicle. More particularly, the present invention relates to a fuel injector of a smoke reduction device that removes smoke from exhaust gas by injecting air and fuel.

In general, diesel vehicles using diesel have a higher engine durability and efficiency of 20-30% than gasoline vehicles, and thus have excellent performance in terms of fuel efficiency and power, and have been mainly applied to large vehicles such as trucks and buses. In recent years, with the application of diesel to small and medium-sized vehicle engines, the demand for these small and medium-sized diesel vehicles continues to increase in developed countries.

However, the exhaust gas of diesel vehicles contains a large amount of pollutants such as nitrogen oxides (NOx) and particulate matter (PM, Particulate Matter), it is recognized as the leading cause of air pollution. Therefore, environmental regulations are strictly applied when producing diesel vehicles.

In order to satisfy the exhaust gas regulation of such a diesel engine, the diesel vehicle is equipped with the soot reduction apparatus which purifies and processes exhaust gas. The soot reduction apparatus is to remove and process the particulate matter contained in the exhaust gas. The smoke reduction device has a structure in which fuel is injected into the exhaust gas to ignite the exhaust gas in order to increase the temperature of the exhaust gas. As a result, the temperature of the exhaust gas is increased, and high-temperature exhaust gas flows into the smoke reduction device, thereby burning and removing particulate matter trapped in the smoke reduction device.

However, in the related art, there is a problem in that the air is not supplied due to the high pressure of the injected fuel or the fuel flows back toward the air pipe when the fuel and the air are mixed. Therefore, separate parts must be installed and used for proper mixing of fuel and air, resulting in complicated structure and many problems in assembling and after-care.

In addition, in the conventional apparatus, as the fuel is transported through rubber or steel tubing, external exposure of the tubing cannot be avoided, which causes a performance degradation or failure of the apparatus due to pressure loss and breakage of the tubing. In addition, there is a disadvantage in that the device is complicated in appearance and the merchandise is inferior, and the overall appearance of the device is increased, thereby degrading the vehicle mountability.

Accordingly, the fuel injection device of the exhaust gas soot reduction device that can simplify the structure to increase the assembly and maintenance efficiency.

In addition, the present invention provides a fuel injection device of an exhaust gas soot reduction device that can be more compact and can be mounted on a vehicle.

In addition, it provides a fuel injection device of the exhaust gas soot reduction device to improve the pipe structure for fuel supply to prevent damage due to external exposure, and to minimize the pressure loss to reduce energy consumption.

In addition, the present invention provides a fuel injector of an exhaust gas soot reduction device that is capable of optimally mixing fuel and air without using additional parts.

To this end, the apparatus is connected to the exhaust line of the engine in the fuel injector of the exhaust gas emissions reduction device for injecting fuel to the exhaust gas flowing into the smoke reduction device,

The fuel injector may include a fuel cylinder installed on a base member, a cover block installed at an open upper end of the fuel cylinder to seal the fuel cylinder, a fuel injection unit installed in the cover block to inject fuel, and installed in the fuel cylinder to A fuel supply unit for supplying fuel to the fuel injection unit, an air supply unit installed in the base member to supply air to the fuel injection unit,

The cover block may have a structure in which an inflow path and a discharge path through which the fuel is circulated and a supply path through which the fuel is transported by connecting the fuel supply part and the fuel injection part are integrally formed.

The fuel injection unit is installed on the cover block and the fixed block having a conduit connected to the supply passage, the injector is installed on the fixed block and connected to the pipeline to inject fuel, detachably installed on the fixed block and the injector exit And a connection block connected to the fuel and air, wherein the connection block includes a venturi formed in an inner conduit, and a supply hole connected to the air supply unit and formed at a low pressure portion of the venturi to supply air. Can be.

The fuel container may have a rectangular cross-sectional structure.

The fuel supply unit may include a fuel pump disposed in the fuel container and connected to the supply path of the cover block, and installed in the fuel container and connected to the supply path to maintain a constant pressure of the fuel.

According to the present apparatus as described above, it is possible to facilitate the inflow of air, and the flame formation can be made more stably as the fuel and air are optimally mixed and injected.

In addition, there is an advantage that the structure of the device is simple, easy assembly during manufacture, easy maintenance in the after-care.

In addition, the size of the device can be further miniaturized, and thus it is possible to fully mount and use the small vehicle.

In addition, since the pipe for fuel supply is formed inside the aluminum block, the pipe is not exposed to the outside of the device, thereby significantly reducing the risk of pipe breakage and minimizing energy waste due to reduced pressure loss in the pipe. .

1 is a perspective view showing a fuel injection device of the exhaust gas soot reduction apparatus according to the present embodiment.
2 is an exploded perspective view showing the fuel injector of the exhaust gas soot reduction device according to the present embodiment.
3 is a side view of the fuel injection device of the exhaust gas soot reduction device according to the present embodiment.
4 is a view illustrating an internal conduit formed in a cover block in the fuel injection device of the exhaust gas soot reduction apparatus according to the present embodiment.
5 is a cross-sectional view showing the venturi structure of the fuel injection device of the exhaust gas soot reduction device according to the present embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Possible identical or similar parts are represented using the same reference numerals in the drawings.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

1 illustrates a state in which a fuel injector is connected to an engine and a fuel tank of a vehicle, and FIG. 2 illustrates an exploded view of the configuration of the fuel injector.

As shown, the fuel injector 100 of the present embodiment is a structure for injecting a mixture of fuel and air to the exhaust line to increase the temperature of the exhaust gas flowing into the smoke reduction device through the exhaust line of the engine 500 It is.

The fuel injector 100 may be installed on the fuel tank 20 installed on the base member 10, a cover block 30 installed on an open upper end of the fuel tank 20 to seal the fuel tank 20, and the cover block. A fuel injection unit 40 installed at 30 to inject fuel, a fuel supply unit 50 installed in the fuel container 20 to supply fuel from the fuel container 20 to the fuel injection unit 40, and the base member It is provided in the (10) comprises an air supply unit 60 for supplying air to the fuel injection unit (40).

The base member 10 is provided with a housing 12 to cover and protect the components to cover the device.

In this embodiment, the fuel container 20 has a rectangular cross-sectional shape. This increases the internal volume of the fuel container 20 can be reduced in size.

That is, conventionally, the fuel container 20 has a cylindrical structure. In the case of such a structure, the diameter of the fuel container 20 is increased to secure the required volume, so that the width or length of the device is increased, thereby increasing the overall volume of the device. Therefore, in the related art, the size of the device is large, and thus the mounting is inferior, and a problem that is difficult to apply to a small vehicle occurs.

However, in the present embodiment, as described above, the fuel container 20 is formed in a rectangular box shape, while sufficiently securing the internal volume, the size of the fuel injector 100 can be reduced in size, thereby making it more compact.

In addition, the cover block 30 serves as a cover for covering the open upper end of the fuel container 20 and has a structure in which fuel is distributed through the inside. Thus, the device does not have a complicated piping structure, unlike the conventional, it is possible to further reduce the size.

To this end, the cover block 30 is made of a rectangular plate structure having a predetermined thickness so that a conduit can be formed therein. The cover block 30 is formed to have a size covering the upper portion of the fuel tank 20, the bolt fastening hole is formed along the outer peripheral portion is coupled to the upper end of the fuel tank 20 via the bolt (31). A packing 32 may be further installed between the fuel container 20 and the cover block 30 to maintain airtightness.

As shown in FIGS. 3 and 4, the cover block 30 communicates with the fuel container 20 to allow the fuel to flow through the inflow path 33, the discharge path 34, the fuel supply unit 50, and the fuel. The supply passage 35 through which the fuel is transferred by connecting the injection units 40 is integrally formed.

The inflow path 33 and the discharge path 34 are for supplying or discharging fuel into the fuel container 20. The inflow path 33 and the discharge path 34 are formed in the horizontal direction on the cover block 30 side, respectively, and the inner end thereof is formed downward toward the fuel cell 20 to communicate with the fuel cell 20.

Hose plugs 36 are respectively installed at the outer ends of the inflow path 33 and the discharge path 34 to protrude outward of the cover block 30. In the present embodiment, the inflow path 33 is connected to the engine 500 through the inflow hose 510. Accordingly, the remaining fuel used in the engine 500 is supplied to the apparatus through an inlet hose 510, and is introduced into the fuel tank 20 through an inflow path 33 formed in the cover block 30. In addition, the discharge path 34 is connected to the fuel tank 520 of the vehicle through the discharge hose 530. The fuel remaining after filling the fuel container 20 is discharged to the fuel tank 520 of the vehicle through the discharge hose (530).

The supply path 35 is for transporting the fuel in the fuel container 20 to the fuel injection unit 40. The supply path 35 is formed in the horizontal direction in the cover block 30 and extends to the side in which the fuel injection unit 40 is installed. The fuel is distributed through the inside of the cover block 30 that is the cover of the fuel container 20. The supply path 35 has an inner end formed downward toward the fuel container 20 and is connected to the fuel supply unit 50.

As described above, the apparatus distributes fuel through the inside of the cover block 30 without a separate pipe for fuel distribution, thereby preventing pressure loss and simplifying the structure of the apparatus to reduce its size.

On the other hand, the fuel in the fuel tank 20 is supplied to the fuel injection unit 40 through the supply path 35 formed in the cover block 30 in accordance with the driving of the fuel supply unit 50.

In this embodiment, the fuel supply unit 50 has a structure installed inside the fuel container (20).

The fuel supply unit 50 is disposed in the fuel container 20 and is connected to the supply path 35 of the cover block 30. The fuel pump 51 is installed inside the fuel container 20 and the supply path 35. And a regulator 52 connected to the phase for maintaining a constant pressure of the fuel.

Since the present apparatus has a rectangular shape of the fuel container 20, even if not only the fuel pump 51 but also the regulator 52 is provided inside as described above, sufficient internal volume can be ensured. In this way, the fuel pump 51 and the regulator 52 are not disposed outside the apparatus, so that the size of the apparatus can be reduced in size.

The fuel pump 51 is fixedly installed at the bottom of the cover block 30 facing the fuel container 20. The cover block 30 is further provided with a power connector 53 for applying power to the fuel pump 51. The power connector 53 is fixedly installed in the coupling hole 37 formed through the cover block 30 to extend into the fuel container 20 and electrically connected to the fuel pump 51.

The fuel pump 51 is provided with a hose 54 at the outlet from which the fuel is discharged, and the hose 54 extends vertically toward the cover block 30 so that the supply passage 35 formed in the cover block 30 is formed. Connected with. The inlet of the fuel pump 51 is provided with a strainer 55 for removing foreign matter of the fuel.

The regulator 52 is also connected to the supply path 35 of the cover block 30. The regulator 52 has a hose 56 installed at the top thereof, and the hose 56 extends vertically toward the cover block 30 and is connected to the supply path 35 formed in the cover block 30.

As the fuel pump 51 is driven, fuel is supplied to the fuel injection part 40 through the supply path 35 of the cover block 30.

To this end, the fuel injection unit 40 is installed in the fixed block 41, the fixed block 41 having a conduit 42 is installed in the cover block 30 and connected to the supply path 35. And an injector 43 which is connected to a pipe line and injects fuel, and is detachably installed on the fixed block 41 and connected to an outlet of the injector 43 so that fuel and air are mixed.

The fixing block 41 is fixedly installed on the side of the cover block 30 via a bolt. The fixed block 41 has an inner conduit 42 connected to a supply path 35 extending to the side of the cover block 30 on a surface in contact with the cover block 30. When the fixed block 41 is installed in the cover block 30, the inner conduit 42 of the fixed block 41 is connected to the supply path 35 of the cover block 30.

Outside the fixed block 41, a pressure sensor 46 is connected to the inner conduit 42 to detect the pressure of the fuel when the fuel is supplied.

An injector 43 is installed at the central portion of the fixed block 41 to be connected to the inner conduit 42 of the fixed block 41. The injector 43 injects fuel as the internal valve opens and closes.

The connection block 45 is detachably installed on the fixed block 41 via a bolt. The connection block 45 is installed at the front end side of the fixed block 41 and connected to the injector 43.

As shown in FIG. 5, the connection block 45 is for mixing air with fuel injected from the injector 43, and a venturi 47 formed in an inner conduit and air of the air supply unit 60. It is connected to the supply pipe 63 and is formed in the low pressure portion 48 of the venturi 47 includes a supply hole 49 for supplying air. The venturi 47 penetrates through the connection block 45 to discharge the mixed gas of fuel and air through the outlet of the venturi 47 formed on the outer surface of the connection block 45. Although not shown, the outer end of the connection block 45 forming the outlet of the venturi 47 is connected to the exhaust line of the engine 500 through a separate pipe to eject the mixed gas to the exhaust line.

Here, the supply hole 49 is formed at right angles to the venturi 47 at the side of the connection block 45. In the present embodiment, the position where the supply hole 49 is formed is the low pressure part 48 which is an acceleration section in which the pressure of the fuel is minimized while the fuel injected from the injector 43 passes through the venturi 47. Since the velocity and the pressure of the fluid are inversely proportional to each other, as air is supplied to the low pressure portion 48 of the venturi 47 through the supply hole 49, the air smoothly flows into the venturi 47 and mixes with the fuel. do. Therefore, the present apparatus can prevent the backflow of the fuel to the air supply as in the prior art without a separate component for preventing the backflow. In addition, the device may further install a check valve in the air supply pipe (63) connected to the supply hole (49) for more reliable prevention of backflow.

The supply hole 49 is connected to the outside through the air supply unit 60 and the air supply pipe 63 to introduce the air supplied from the air supply unit 60 into the venturi 47.

The air supply unit 60 includes an air compressor 61 installed on the base member 10 and connected to the supply hole 49. On the air supply pipe 63 connecting the air compressor 61 and the supply hole 49, an air pressure sensor 62 for detecting the pressure of air at the time of air supply is further installed.

Hereinafter, the operation of the apparatus will be described.

The fuel discharged from the engine 500 after being used is introduced into the apparatus through the inlet hose 510 and transferred to the fuel tank 520 of the vehicle through the discharge hose 530. The fuel is introduced into and discharged from the fuel container 20 through the inflow path 33 and the discharge path 34 formed in the cover block 30. When the fuel pump 51 inside the fuel container 20 is driven, the fuel is supplied to the fixed block 41 through the supply path 35 formed in the cover block 30, and the injector 43 connected to the pipeline of the fixed block 41. Is supplied. And it is selectively sprayed according to the drive of the injector 43. The fuel injected from the injector 43 is mixed with air while passing through the venturi 47 formed in the connection block 45.

At this time, the air supplied to the supply hole 49 of the connection block 45 by the air compressor 61 is more smoothly supplied to the low pressure part 48 of the venturi 47, that is, the portion of the fuel pressure is minimized. Is supplied.

The mixed gas of fuel and air is injected into the exhaust line connected to the connection block 45 to generate a flame in the exhaust gas passing through the exhaust line. Therefore, before the exhaust gas is introduced into the smoke reduction device installed in the exhaust line, the temperature of the exhaust gas is increased.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10: base member 12: housing
20: fuel container 30: cover block
33: inlet 34: outlet
35: supply path 40: fuel injection unit
41: fixed block 42: pipeline
43: injector 45: connection block
47: Venturi 48: low pressure part
49: supply hole 50: fuel supply unit
51: fuel tank 52: regulator
60: air supply unit 61: air compressor

Claims (4)

In the fuel injector of the exhaust gas soot reduction device connected to the exhaust line of the engine for injecting fuel to the exhaust gas flowing into the smoke reduction device,
The fuel injector is installed on the base member and connected to the engine and the fuel tank of the vehicle, the fuel used in the engine is supplied to the remaining fuel and the remaining fuel is discharged to the fuel tank of the rectangular cross-section structure, installed in the open upper end of the fuel tank A cover block for sealing the fuel cell, a fuel injection part installed in the cover block to inject fuel, a fuel supply part installed in the fuel cell to supply fuel from the fuel cell to the fuel injection part, and installed in the base member to supply air to the fuel injection part; An air supply for supplying to
The cover block communicates with the fuel container and receives the fuel supplied from the engine, the discharge path communicating with the fuel container to discharge the fuel in the fuel container to the fuel tank of the vehicle, and connecting the fuel supply part and the fuel injection part to transfer the fuel. The supply path is formed integrally to distribute the fuel through the inside of the cover block,
The fuel injection unit is installed on the cover block and the fixed block having a pipeline connected to the supply passage, the injector is installed on the fixed block and connected to the pipeline to inject fuel, detachably installed on the fixed block detachable injector A connection block connected to the fuel and air mixture,
The connecting block includes a venturi formed in the inner conduit and a supply hole connected to the air supply and formed in the low pressure portion of the venturi to supply air to the exhaust gas soot reduction apparatus. delete delete The method of claim 1,
The fuel supply unit includes a fuel pump disposed inside the fuel container and connected to the supply path of the cover block, and installed in the fuel container and connected to the supply path to reduce the exhaust gas soot including a regulator for maintaining a constant pressure of the fuel. Fuel injector of the device.

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