WO2012138000A1 - Exhaust gas temperature reduction device for an engine of construction equipment - Google Patents

Abstract

The present invention relates to an exhaust gas temperature reduction device for an engine of construction equipment. The exhaust gas temperature reduction device includes: a cooling fan (3) disposed on a side of an engine room (7) to introduce external air, thereby generating a cooling fan air current (9); a tail pipe (10) including a turbulence flow inlet port (14) and a first guide (13a) for guiding the cooling fan air current (9) into the inside of the engine room, the tail pipe (10) having one end connected to an exhaust gas reduction device (6) and the other end extending to the outside of the engine room (7) to discharge overheated gas discharged during recycling by the exhaust gas reduction device (6) to the outside; and a diffuser (20) including an external air inlet port (24) exposed to the outside of the engine room (7) and a second guide (23a) disposed adjacent to the external air inlet port (24) to guide introduced external air to the inside of the engine room, the diffuser forming a separate space surrounding an outer diameter of the tail pipe (10) to prevent the diffuser from directly contacting the tail pipe (10).

Description

Exhaust gas temperature reduction device for engine of construction machinery

The present invention relates to an exhaust gas temperature reduction device for an engine of a construction machine, and more particularly, the exhaust gas generated in the combustion process of an engine for a construction machine, preferably a smoke reduction device of a diesel engine, is diffuser and tail. The present invention relates to an exhaust gas temperature reduction device for an engine of a construction machine, which is improved to join a cooling fan airflow and outside air when passing through a pipe to discharge exhaust gas at a low temperature.

Conventionally, in a diesel engine using fossil fuel or a hybrid type construction machine used together with electric energy, it is common to use a smoke reduction device for regeneration and post-treatment of exhaust gas.

Particularly, emissions of particulate matter (PM) contained in exhaust gas emitted from diesel engines of construction machinery provide one cause for environmental pollution and air pollution, and it is fatal when entering human lungs or respiratory organs. Due to the damage, regulations on particulate matter emissions are being tightened around the world.

In order to solve such problems such as environmental pollution, a diesel particulate filter (DPF), which collects and processes particulate matter to prevent particulate matter from diesel vehicles, is released into the atmosphere. At some point after collecting the filter, the filter is regenerated by repeating the process of burning the filtered soot or whipping without burning. At this time, the exhaust gas of the engine discharged through the smoke reduction device is discharged to the outside by a high temperature airflow, thereby causing a problem that may cause a fire burn.

In order to solve the above problems, a technology for reducing the temperature of the exhaust gas through the tail pipe connected to the smoke reduction device has been researched and developed, for example, published in Korean Patent Publication No. 2010-86525 published on August 2, 2010. An engine room superheat gas temperature reduction device is well known as an example of an exhaust gas temperature reduction device for an engine of a construction machine.

1 is a view schematically showing a state in which the exhaust gas temperature reduction apparatus for an engine of a conventional construction machine described above is mounted in an engine room. As shown, a through hole formed in one side of the engine room 7 is illustrated. (2); and one end is connected to the smoke reduction device (5) and the other end is extended to the outside of the engine room (7) through the through hole (2) and the superheated gas discharged during the regeneration of the smoke reduction device (5) Tail pipe (1) for discharging to the outside; and a cooling fan (3) provided on one side of the engine room (7) to generate air flow by introducing outside air; And a space formed around the outer diameter of the tail pipe 1 by being combined with the through hole 2 to prevent direct contact with the tail pipe 1 and to prevent dispersion after inhaling the air stream to prevent dispersion of the superheated gas. The diffuser 4 which lowers temperature is included.

This technique uses the exhaust gas of the smoke reduction apparatus 5 and the air flow generated by the cooling fan 3 when the exhaust gas passing through the smoke reduction apparatus 5 is primarily discharged through the tail pipe 1. (9) can be mixed inside the tail pipe 1 to lower the temperature of the overheated flue gas.

However, the airflow 9 generated by the cooling fan 3 passes directly through the outer circumferential surface of the tail pipe 1 or due to poor mixing inside the tail pipe 1, the tape pipe 1 still remains. There is a problem that the temperature of the exhaust gas discharged to the outside through close to a high temperature, for example approximately 500 ℃.

Such hot exhaust gases have a problem of causing overheating of the diffuser 4, and even if not directly in contact with the tail pipe 1, there is a problem of causing fire or personal injury through contact with the diffuser 4.

Therefore, in order to solve the above-mentioned problem, the present invention structurally cools the tail pipe while mixing the airflow generated by the air and the cooling fan inside the diffuser to create turbulent flow, and further, the combined turbulent flow efficiently inside the tail pipe. The purpose is to reduce the overheating of the exhaust gas passing through the smoke reduction device inside the tail pipe.

In order to achieve the above object, the present invention is a diesel engine and exhaust gas temperature reduction device for an engine of a construction machine comprising a smoke reduction device connected to the exhaust pipe of the diesel engine to prevent the discharge of particulate matter,

A cooling fan provided at one side of the engine room to generate cooling fan airflow by introducing external air;

It has a first guide for guiding the turbulent flow inlet and the cooling fan air flow inside, one end is connected to the smoke reduction device, the other end is extended to the outside of the engine room and the superheated gas discharged during the regeneration of the smoke reduction device outside Tail pipe to be discharged into the furnace; And

And an external air inlet exposed to the outside of the engine room and a second guide adjacent to the outside air inlet to guide the outside air introduced therein, and forming a spaced space surrounding the outer diameter of the tail pipe to directly contact the tail pipe. Preventing the diffuser; characterized in that the exhaust gas temperature reduction device for the engine of the construction machine comprising a.

Another feature of the present invention, the tail pipe is composed of a plurality of turbulent inlet formed at an interval of 45 ° angle, the diffuser engine exhaust gas of the construction machine is configured with a plurality of outside air inlet to correspond to the plurality of turbulent inlet It is to provide a temperature reducing device.

The exhaust gas temperature reduction apparatus for an engine of a construction machine according to the present invention is structurally soaked by cooling air outside the engine room from the side of the diffuser, causing turbulence with the airflow generated by the cooling fan, and being supplied into the tail pipe. It is possible to greatly reduce the overheat temperature of the hot exhaust gas passing through the abatement device.

In addition, the turbulence mixed with the outside air collides with the inner surface of the diffuser and the outer surface of the tail pipe to generate heat exchange for cooling, thereby greatly reducing overheating of the exhaust gas and the tail pipe.

1 is a schematic diagram of an engine room equipped with an exhaust gas temperature reduction device for an engine of a conventional construction machine,

2 is a schematic view showing a state in which an exhaust gas temperature reduction apparatus for an engine of a construction machine according to an embodiment of the present invention is installed in an engine room;

Figure 3 is a schematic perspective view showing an exhaust gas temperature reduction device for an engine of a construction machine according to an embodiment of the present invention,

Figure 4 is an operating state schematically showing a state in which air flow generated by the outside air and the cooling fan is introduced into the tail pipe causing turbulence,

FIG. 5 is a cross-sectional view taken along the line A-A shown in FIG. 4 to explain an installation state of the first guide of the diffuser and the second guide of the tail pipe.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In describing one embodiment, redundant additional descriptions are omitted below. In the following embodiments, the same reference numerals refer to the same configuration.

2 is a schematic diagram of a state in which an exhaust gas temperature reduction apparatus for an engine of a construction machine according to an embodiment of the present invention shown in FIG. 2 is installed in an engine room, and for an engine of a construction machine according to an embodiment of the present invention shown in FIG. 3. It demonstrates with reference to the perspective view of an exhaust gas temperature reduction apparatus.

Exhaust gas temperature reduction device for an engine of a construction machine according to the present invention,

In the exhaust gas temperature reduction device for an engine of a construction machine comprising a diesel engine (5) and a smoke reduction device (6) connected to the exhaust pipe of the diesel engine (5) to prevent the discharge of particulate matter,

A cooling fan 3 provided at one side of the engine room 7 to generate external cooling air flow 9 by introducing external air;

And a first guide 13a for guiding the turbulent flow inlet 14 and the cooling fan airflow 9 therein, one end of which is connected to the smoke reduction device 6 and the other end of which is outside the engine room 7. A tail pipe 10 extending and discharging the superheated gas discharged during the regeneration of the smoke reduction device 6 to the outside; And

An outside air inlet 24 exposed to the outside of the engine room 7 and a second guide 23a adjacent to the outside air inlet 24 and guiding the outside air introduced therein, wherein the tail pipe 10 It includes a diffuser 20 to form a spaced space surrounding the outer diameter to prevent direct contact with the tail pipe (10).

In addition, referring to FIG. 4, a plurality of turbulent inlets 14 are formed in the tail pipe 10 at an interval of a predetermined angle, and the diffuser also includes a plurality of outside air to correspond to the plurality of turbulent inlets 14. Inlet 24 is configured.

Preferably, the turbulent inlets 14 of the tail pipe 10 are formed at 45 ° angle intervals, and the outside air inlet 24 of the diffuser 20 is configured to correspond to the spacing of the turbulent inlets 14. do. In this case, the turbulence inlet 14 and the outside air inlet 24 may have different heights and sizes.

The atmosphere of the outside of the engine room 7, preferably the upper part of the engine room, moves to the inside of the diffuser 20 through the outside air inlet 24. Guides the inside of the diffuser 20 and the inside of the tail pipe 10.

On the other hand, the cooling fan (3) is a device for generating an air stream (9) for lowering the temperature of the superheated gas, located on one side of the engine room (7) described above by sucking the outside air from the engine room front to reduce the smoke 6 In the filter regeneration process, the airflow 9 is generated to lower the temperature of the superheated gas discharged.

Preferably, the cooling fan 3 is located behind the radiator 8 to exclude the influence of heat generated in the diesel engine 5 and to produce a constant temperature airflow 9.

The diffuser 20 is structurally larger in diameter or dimension than the tail pipe 1 in order to supply the airflow 9 generated in the cooling fan 3 to the space between the diffuser 20 and the tail pipe 10. It is configured to surround the tail pipe (1).

In the embodiment of the present invention, the connection bracket for fixing the lower end of the diffuser 20 to the smoke reduction device 6 so that the space between the lower end of the diffuser 20 and the tail pipe 10 is maintained ( It is preferable to comprise 21). One side of the connection bracket 21 is a lower end of the diffuser 20 to maintain a standing posture that exposes the lower portion of the diffuser 20 and the outside air inlet 24 to the outside of the engine room 7. It is fixed to one side of the room 7.

The second guide 23a formed on the diffuser 20 includes a plurality of rows provided with another second guide 23b spaced apart from the smoke reduction device 6. The other second guide 23b is attached to protrude on the inner circumferential surface of the upper side of the diffuser 20 while the second guide 23a is adjacent to the outside air inlet 24 at the lower end of the diffuser 20. It is formed to protrude on the inner circumferential surface of the lower side of the diffuser 20.

The other second guide 23b configured at one side of the upper part of the diffuser 20 may be configured as a protruding air duct or channel in which the angle of the rear surface is adjusted in consideration of the air flow and the exhaust capacity or the required flow rate of the turbulent flow. In this case, it is suitable to stagger the air ducts or channels on the outer surface of the tail pipe 10.

The second guide 23a may be configured at predetermined intervals in the range of 30 ° to 90 ° radially on the lower inner circumferential surface of the diffuser 20, and the second guide 23b other than the second guide 23a may be formed. ) Can also form a plurality of rows by being configured at predetermined intervals in the range of 30 to 90 degrees radially on the upper inner circumferential surface of the diffuser 20.

On the other hand, the first guide (13a) formed in the tail pipe 10 is composed of a plurality of rows provided with another first guide (13b) spaced from the soot reduction device (6). The other first guide 13b is attached to protrude on the inner circumferential surface of the upper side of the tail pipe 10, while the first guide 13a is connected to the turbulent inlet 14 at the lower end of the tail pipe 10. Adjacent to the inner peripheral surface of the lower side of the tail pipe 10 is formed.

The first guide 13a may be configured at predetermined intervals in the range of 30 ° to 90 ° radially on the lower inner circumferential surface of the tail pipe 10, and a second guide other than the first guide 13a ( 13b) may also form a plurality of rows by projecting radially on the upper inner circumferential surface of the tail pipe 10 at predetermined intervals in an angle range of 30 ° to 90 °.

The other second guide 13b formed on one side of the inner circumferential surface of the tail pipe 10 is composed of a protruding air duct or channel whose angle of the rear surface is adjusted in consideration of the air flow, the exhaust capacity, or the required flow rate of the turbulent flow. can do. For example, when the displacement is large, the heat exchange time between the turbulent flow and the exhaust gas can be maintained relatively large by adjusting the angle of the air duct and its rear slope.

According to an embodiment of the present invention, when the exhaust gas is discharged from the tail pipe (1) via the soot reduction device (6), the diffuser 20 is mixed with the outside air and the cooling fan air flow (9) to generate turbulence The low temperature turbulence is mixed and discharged with the hot exhaust gas inside the tail pipe 10.

Preferably, the diffuser 20 has an outer diameter of the tail pipe 10 in a space separated from the inside of the diffuser 20 by turbulence caused by the air from the cooling fan airflow 9 and the outside of the engine room 7. The outer peripheral surface of the tail pipe 10 is cooled by wrapping. Accordingly, a direct contact between the structure or body outside the diffuser 20 and the tail pipe 10 can be prevented, so that the risk of fire and burns can be prevented.

Specifically, in the process of exhaust gas discharged from the tail pipe 1 via the smoke reduction device 6, the cooling fan air flow 9 is the outside air of the turbulent inlet 13 and the diffuser 20 of the tail pipe 10. Reach inlet 24. A part of the reached cooling fan airflow 9 hits the rear surface of the plurality of rows of second guides 23a formed below the inner circumferential surface of the diffuser 20 and primarily the turbulent inlet 13 of the tail pipe 10. Will change direction.

That is, the turbulence is generated by collision and mixing with the atmosphere introduced from the side through the outside air inlet 24 of the diffuser 20. In this process, the remaining air flow of the cooling fan air flow 9 (meaning an air flow component parallel to the inner circumferential surface of the diffuser) goes straight beyond the rear surface of the second guide 23a of the diffuser 20 and the tip thereof, so that the diffuser 20 It may collide with and guide the rear surface of the plurality of rows of the second guides 23a formed on the upper inner circumferential surface of the bottom surface 10).

Ultimately, a turbulent mixture of the cooling fan airflow 9 generated by the cooling fan 3 inside the engine room 7 and the atmosphere outside the engine room is introduced into the tail pipe 10. , The turbulent flow not introduced into the tail pipe 10 wraps on the outer circumferential surface of the tail pipe 10 and rotates toward the top of the tail pipe 10. In this process, the turbulence may be generated again while hitting the rear surface of the second row of second guides 23b that protrude on the upper inner circumferential surface of the diffuser 20.

On the other hand, in some cases, the plurality of rows of second guides 23a or 23b protruding on the inner circumferential surface of the diffuser 20 do not suppress the pneumatic flow of the cooling fan airflow 9 without causing the tail pipe 10 and the exhaust gas. Its shape and arrangement can be modified in various ways within the range of reducing the temperature of.

For example, the rear angle of the rear surface of the first guide 23a or 23b of the diffuser 20 may be adjusted in a range of 15 ° to 80 °, and an additional twist angle may be applied.

As described above, the turbulence in which the cooling fan airflow 9 and the atmosphere outside the engine room 7 are mixed is introduced through the turbulence inlet 13 according to an embodiment of the present invention, which is an outside air inlet of the diffuser 20. It is more effective if the height difference is different between the 24 and the turbulent inlet 13 of the tail pipe 10.

For example, the outside air inlet 24 of the diffuser 20 has a relatively low height from the soot reducer 6, and the turbulent inlet 14 of the tail pipe 10 is relatively high from the soot reducer 6. In the case of having a height, the turbulence is hit against the rear surface of the second guide 23a of the diffuser 20, so that the flow direction of the turbulence is directed toward the turbulent inlet 14 of the tail pipe 10. Turbulent inflow efficiency can be increased.

On the other hand, the turbulence and the exhaust gas introduced into the turbulent inlet 14 of the tail pipe 10 is mixed and discharged to the outside through the upper portion of the tail pipe 10, the exhaust gas mixed in this process is the tail pipe 10 On the rear surface of the first guide 13b formed adjacent to the upper portion of the. At this time, the high-temperature exhaust gas is discharged to the outside through mixing and heat exchange with the low-temperature turbulence flowing from the turbulent inlet 14.

Ultimately, the exhaust gas temperature reduction device for an engine of a construction machine according to the present invention includes an outdoor air inlet 24 and a second guide 23a or 23b of the diffuser 20, and a turbulent inlet 14 of the tail pipe 10. And the temperature of the exhaust gas, the tail pipe 10 and the diffuser 20 may be lowered to a relatively low temperature while passing through the first guide 13a or 13b, and the exhaust gas may be a vortex turbulent flow outside the engine room 7. It can be released to.

Although the present invention has been described in detail with reference to the accompanying drawings and embodiments, the accompanying drawings and the foregoing embodiments are described by way of example to help those skilled in the art to understand the present invention. Accordingly, the foregoing embodiments are to be considered as illustrative and not restrictive, and the scope of the invention should be construed in accordance with the invention set forth in the appended claims, the scope of which is to be understood by those of ordinary skill in the art. It may further include various modifications, alternatives, and equivalents by the ruler.

Exhaust gas temperature reduction device for an engine of a construction machine according to the present invention can be effectively applied to construction machinery used for excavation, transportation and stopping work of earth and sand as well as excavators and tow loaders.

Claims (5)

In the exhaust gas temperature reduction device for an engine of a construction machine comprising a diesel engine (5) and a smoke reduction device (6) connected to the exhaust pipe of the diesel engine (5) to prevent the discharge of particulate matter, A cooling fan 3 provided at one side of the engine room 7 to generate external cooling air flow 9 by introducing external air; And a first guide 13a for guiding the turbulent flow inlet 14 and the cooling fan airflow 9 therein, one end of which is connected to the smoke reduction device 6 and the other end of which is outside the engine room 7. A tail pipe 10 extending and discharging the superheated gas discharged during the regeneration of the smoke reduction device 6 to the outside; And An outside air inlet 24 exposed to the outside of the engine room 7 and a second guide 23a adjacent to the outside air inlet 24 and guiding the outside air introduced therein, wherein the tail pipe 10 The exhaust gas temperature reduction apparatus for a construction machine, comprising: a diffuser (20) for preventing direct contact with the tail pipe (10) by forming a spaced space surrounding an outer diameter. The method of claim 1, The tail pipe 10 includes a plurality of turbulent inlets 14 formed at an interval of 45 °, and the diffuser 20 includes a plurality of outside air inlets 24 to correspond to the plurality of turbulent inlets 14. Exhaust gas temperature reduction device for an engine of a construction machine, characterized in that the. The method according to claim 1 or 2, Exhaust gas temperature reduction apparatus for an engine for a construction machine, characterized in that the second guide (23a or 23b) formed in the diffuser 20 is composed of a plurality of rows spaced apart from the soot reduction device (6). The method according to claim 1 or 2, Exhaust gas temperature reduction apparatus for an engine for a construction machine, characterized in that the first guide (13a or 13b) formed in the tail pipe (10) is composed of a plurality of rows spaced apart from the smoke reduction device (6). The method according to claim 1 or 2, It further comprises a connection bracket 21 for fixing the lower end of the diffuser 20 to the smoke reduction device 6 so that the space between the lower end of the diffuser 20 and the tail pipe 10 is maintained. Exhaust gas temperature reduction device for an engine of a construction machine, characterized in that.

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