KR100759516B1 - Engine system which is provided with a vortex tube instead of a egr cooler - Google Patents

Abstract

An engine system provided with a vortex tube is provided to prevent excessive back pressure of exhaust gas by using a plurality of check valves. An engine system provided with a vortex tube comprises a vortex tube(50) having an inlet(51), a cool air outlet(52) and a warm air outlet(53). The inlet of the vortex tube is connected to an exhaust manifold(40) through a second recirculation line(91) branched from a branch point of an exhaust pipe. The cool air outlet of the vortex tube is connected to an intake manifold(20) via an EGR valve(54). The warm air outlet of the vortex tube is connected to an exhaust pipe(80) at a first joint point(82). A DPF(Diesel Particulate Filter) or CPF(Catalyzed Particulate Filter)(60) is installed on the exhaust pipe. The EGR valve is connected to an ECU of a vehicle to control the recirculation amount of exhaust gas under the control of the ECU.

Description

Engine system which is provided with a vortex tube instead of a EGR cooler}

Figure 1a shows a vehicle refrigeration system using a conventional vortex tube.

1B is a conceptual diagram for explaining the vortex tube theory.

2 is a conceptual view for explaining a conventional RG device.

3 is a view illustrating an engine system equipped with a Vortex tube for replacing an RG cooler according to the present invention.

* Brief Description of Drawings *

11 Engine system 20 Intake manifold

30.Engine 40.Exhaust manifold

50 ... Vortex tube 51 ... Inlet

52 ... cold outlet 53 ... warm outlet

60 Soot filter 70 Suction line

71 Connection point 80 Exhaust pipe

81 ... Classification point 82 ... First confluence point

83..2nd confluence point 90 ... 1st recirculation line

91.Recycle line 2 92.Exhaust line

93 ... 1 Bypass Branch 94 ... 2 Bypass Branch

95 ... 1st check valve 96 ... 2nd check valve

100 ... 1 bypass line 101 ... 2 bypass line

The present invention relates to an engine system equipped with a vortex tube for replacing an exhaust gas recirculation cooler.

In general, the vortex tube uses spontaneous thermal separation of air rotating at high speed, and a cooling apparatus using such a vortex tube is known as shown in FIGS. 1A and 1B. 1A and 1B refer to the drawings attached to the Republic of Korea Patent Application No. 10-2002-0072314 and the name "vehicle refrigeration system using a vortex tube" of the invention.

Vortex tube theory will be described with reference to FIG. 1B. When the compressed air at a predetermined pressure is supplied to the vortex tube inlet 151 through the pipe, the compressed air is introduced into the vortex rotating chamber 152 of the tubular shape to make the ultra-high speed rotation at the millions of RPMs.

This rotating air (hereinafter referred to as primary vortex) is partially discharged through the warmth outlet 154, and the remaining air is returned by the control valve 156 to form a secondary vortex inside the primary vortex. Exit through cold air outlet 158. That is, in the inner space of the vortex tube 150 is formed a separate vortex running in the opposite direction along the longitudinal direction from the outside and the inside.

At this time, the secondary vortex flow loses heat and is directed toward the cold air outlet 158 as it passes through the region of lower pressure inside the primary vortex flow.

Here, the two air streams rotated as described above are rotated in the same direction and at the same angular velocity, wherein the air particles in the inner flow (secondary vortex) are rotated one time with the air particles in the outer flow (primary vortex). (The same angular velocity), the actual speed of motion is lower in the inner flow than in the outer flow. This difference in kinetic speed means that the kinetic energy is reduced, and this lost kinetic energy is converted to heat, raising the air temperature in the outer flow (primary vortex), and the inner flow (secondary vortex) becoming more and more cool. It goes down.

The helical arrow (running to the right) indicated relatively outward in the vortex tube 150 of FIG. 1B indicates the flow of the primary vortex, and the spiral arrow (running to the left) marked inside indicates the flow of the secondary vortex. Indicates.

Referring to Figure 1a will be described a vehicle refrigeration system using a conventional vortex tube.

The conventional vehicle refrigeration system includes an air compressor (110) for providing compressed air, a dryer (120) for removing heat and moisture from the compressed air supplied from the air compressor (110), and the dryer (120). A compressed air tank 130 for storing a compressed air and supplying compressed air stored at a predetermined pressure state during operation of the refrigeration system, and installed in the refrigerator main body 140 to supply compressed air from the compressed air tank 130. Including a vortex tube 150 for receiving cold air, the cold air outlet of the vortex tube 150a is installed to directly spray cold air into the freezing chamber 142, the cold air outlet of the vortex tube 150a is a freezing chamber ( 144) installed to spray cold air to the outside, and the inside of the refrigerator main body 140 was cooled using a vortex tube.

Meanwhile, FIG. 2 shows an engine system equipped with a conventional EZ cooler. 2 is a slight modification of the drawings attached to the Republic of Korea Patent Application No. 10-2002-0039027, the name of the invention "automobile exhaust gas recirculation device".

In general, an EZR device is a technique of recycling a part of the exhaust gas back to the intake system to increase the concentration of CO _{2 in} the intake air to lower the temperature of the combustion chamber and thereby reduce the NOx.

EZR Cooler equipped with EZR Cooler is a method that reduces NOx without increasing fuel economy and PM due to the strict emission control of diesel engines. It is a device that can be obtained.

In this case, the EZR cooler cools the exhaust gas temperature of about 700 ° C to 150 ° C to 200 ° C.

In the related art, as shown in FIG. 2, the exhaust gas recirculation apparatus 1 recycles a part of the exhaust gas exhausted through the exhaust manifold 3 to the intake manifold 2 to reduce the generation of NOx. It is.

As shown in Fig. 2, a shell & tube type cooler 4 is installed in the exhaust gas recirculation path so that the exhaust gas can be supplied in a cooled state. The coolant of the engine 10 is used as the cell fluid, and the coolant flows in from the coolant inlet 7in and flows out to the coolant outlet 7out. Exhaust gas is used as the tube fluid, and the exhaust gas flows through the right conduit 6in extending from the exhaust manifold 3 and flows out to the left conduit 6out extending to the intake manifold 2. Reference numeral 11 in the drawings shows a combustion chamber.

Meanwhile, a soot filtration device (also called a diesel particulate filter (DPF) or a catalyzed particle filter (CPF)) is a device for reducing smoke by installing a filter that collects particulate matter such as PM in an exhaust pipe. There is also a simple filter method, but it usually uses a method of burning particulate matter collected in the filter in a certain period of time. In general, the soot filter technology is largely divided into PM trapping technology and regeneration technology. The soot filter device basically consists of a filter and a regeneration device.

In this case, the soot filtration device is regenerated by applying air or heat to reburn the collected soot and continue to collect the particles.

Specifically, the soot filtration device of the electric heater is reproduced through an external heat source by the electric heater. The burner regeneration type soot filtration regenerates the PM burner by driving the diesel burner when the deposition amount exceeds a certain amount. The fuel additive type soot filtration apparatus is regenerated by injecting an additive which promotes oxidation of particulate matter into the fuel and causing a reaction only by the temperature of the exhaust gas to regenerate the filter. The catalyst coating type soot filtration regenerates the catalyst in a filter to promote oxidation of PM.

However, the engine system equipped with the conventional EZ cooler consumes engine coolant and requires components such as piping, which increases the weight of the vehicle, occupies the installation space, increases air resistance, and reduces the running performance of the vehicle. There was a problem letting.

In order to solve the above problems and the like, an object of the present invention is to provide an engine system equipped with a vortex tube for the replacement of the EG cooler to reduce the concentration of NOx, reduce the concentration of PM, and simple structure.

In addition, another object of the present invention is to provide an engine system equipped with a vortex tube for replacing an EG cooler installed with a simple filter type soot reduction device by increasing the exhaust gas temperature.

In addition, another object of the present invention is to provide an engine system equipped with a vortex tube for EZR cooler replacement equipped with a check valve operating above a predetermined pressure to reduce the back pressure.

In order to achieve the above object of the present invention, the engine system equipped with a vortex tube for replacing an EG cooler according to the present invention is an engine system for a diesel vehicle including an EGR (Exhaust Gas Recirculation) device. And a vortex tube having a cold air outlet and a warm air outlet; The inlet of the vortex tube is connected to the exhaust manifold through a second recirculation line branching at the fractionation point of the exhaust pipe; A cold air outlet of the vortex tube is connected to an intake manifold via an IG valve; The warmth outlet of the vortex tube is connected to the exhaust pipe at a first confluence point located downstream of the fractionation point and located at the inlet of the soot filtration device (DPF, CPF).

Preferably, the exhaust pipe is located at the outlet side of the soot filtration device starting at the first bypass point located between the EZ valve and the vortex tube so as to reduce the back pressure of the exhaust gas. Extends to a second confluence point of; The first check valve is a check valve that is opened at a predetermined pressure or more and is installed on the first bypass line.

Preferably, a second bypass line is formed extending from the second bypass point on the second recirculation line to the inlet side of the soot filtration device so as to reduce the back pressure of the exhaust gas; The second check valve is a check valve that is opened at a predetermined pressure or more and is installed on the second bypass line.

Preferably, the soot filtration device is a device for regenerating using exhaust gas discharged from the warm outlet of the vortex tube. In some cases, only the filter may be configured inside the housing and the housing.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The engine system 11 equipped with an EG cooler replacement vortex tube is largely composed of an intake manifold 20, an engine 30, an exhaust manifold 40, a vortex tube 50, and a soot filtration device (DPF, CPF, 60).

The intake manifold 20 is an intake manifold of a general engine and sucks air through the intake line 70. An air cleaner (not shown) is installed on the intake line 70, and is connected to the first recirculation line 90 at the connection point 71 so that the air and the recycled exhaust gas are mixed and supplied to the intake manifold 20. do. The connection point 71 is generally installed in the vicinity of the throttle valve.

The exhaust manifold 40 is an exhaust manifold of a general engine and exhausts exhaust gas through the exhaust pipe 80. On the exhaust pipe 80, a soot filtration device 60 and a muffler (not shown) are installed. In some cases, various exhaust gas aftertreatment devices, such as three-way catalytic converter, may be added at appropriate locations.

The engine 30 is preferably a common rail diesel engine.

The soot filtration device 60 is a soot filtration device of various methods, preferably a soot filtration device of a simple filter type without a separate regeneration device (PM oxidation), the exhaust gas by the vortex tube 50 The temperature of is raised above the natural regeneration temperature (600 ~ 650 ℃) of the soot filtration device, even if the simple filter method is regenerated and PM is reduced.

The vortex tube 50 is a general vortex tube and has an inlet 51, a cold air outlet 52, and a warmer outlet 53. The internal structure of the vortex tube 50 corresponds to a general vortex tube, and may be modified to have a symmetrical vortex tube or the like.

The inlet 51 is connected to the exhaust manifold 40 through a second recirculation line 91 branched at the fractionation point 81 of the exhaust pipe 80 to connect a passage through which high-temperature, high-pressure exhaust gas is introduced. to provide.

The cold air outlet 52 is connected to the intake manifold 20 through the first recirculation line 90 to provide a passage for exiting the cooled exhaust gas formed by the vortex inside the vortex tube 50. At this time, some soot (PM) is separated by the vortex (rotational movement) inside the vortex tube 50, and the cooled exhaust gas flows out to the cold air outlet 52. On the other hand, some of the separated soot is sent to the soot reduction device 60 through the warmth outlet 53.

The warmth outlet 53 is connected to the inlet of the soot reduction device 60 through the exhaust line 92, the exhaust gas is raised by the vortex tube 50 to the natural regeneration temperature (600 ~ 650 ℃) or more Flow into the smoke reduction device (60). As a result, PM is burned (regenerated) without heating by a separate catalyst device, fuel injection type combustion, or the like.

The EG valve 54 is connected to the vehicle's engine oil (ECU) to control the amount of recycle of the exhaust gas under the control of the fuel oil, thereby optimizing the reduction of engine output and NOx. In some cases, the easy valve 54 is not controlled by the ECU, but may be a valve that operates by using the negative pressure of the throttle valve.

The first check valve 95 is preferably a check valve that opens above a predetermined pressure and is installed on the first bypass line 100, the first bypass line 100 being the first recirculation line 90. It is a pipe which is formed at the outlet side of the soot filtration device 60 starting from the first bypass point 93 on the) and extends to the second confluence point 83 on the exhaust pipe 80. When the back pressure rises due to the closing of the egg valve 54 or the like, the first check valve 95 is opened to discharge the exhaust gas into the atmosphere. This prevents excessive rise of the back pressure of the exhaust gas.

The second check valve 96 is preferably a check valve which is opened at a predetermined pressure or higher and is installed on the second bypass line 101, and the second bypass line 100 is connected to the second recirculation line 91. The pipe is located at the inlet side of the soot filtration device 60 starting from the second bypass point 94 on the exhaust pipe and extending to the exhaust pipe 80 or the exhaust line 92. When the back pressure rises due to the closing of the egg valve 54 or the like, the second check valve 96 is opened so that the exhaust gas does not flow into the vortex tube 50 and directly flows into the soot filtration device 60. . This prevents excessive rise of the back pressure of the exhaust gas.

The present invention provides an engine system equipped with a Vortex tube for reducing the concentration of NOx, reducing the concentration of PM, and having a simple structure.

In addition, the present invention by using the warmth of the vortex tube, a soot reduction device of a simple filter method can be installed, no separate heating is required.

In addition, the present invention is provided with a first check valve and a second check valve, to prevent the excessive back pressure of the exhaust gas is applied.

In addition, the present invention, unlike the engine system equipped with a conventional EZ cooler does not require additional engine coolant and the like, there is an advantageous effect in terms of design, manufacturing, cost and running performance related to the interior installation of the vehicle.

Claims (4)

In an engine system for a diesel vehicle including an EEG (Exhaust Gas Recirculation) device, A vortex tube having an inlet, a cold air outlet, and a warm air outlet; The inlet of the vortex tube is connected to the exhaust manifold through a second recirculation line branching at the fractionation point of the exhaust pipe; A cold air outlet of the vortex tube is connected to an intake manifold via an IG valve; A warm outlet of the vortex tube is connected to the exhaust pipe at a first confluence point located downstream of the fractionation point and at the inlet of the soot filtration device; Features an engine system with a Vortex tube to replace an EZR Cooler. 2. The fuel cell of claim 1, wherein a first bypass line is located at the outlet side of the soot filtration device starting at a first bypass point located between the EZ valve and the vortex tube to reduce the back pressure of the exhaust gas. Extends to a second confluence point of the exhaust pipe; The first check valve is a check valve that is opened above a predetermined pressure, the engine system equipped with a vortex tube for EZ cooler replacement, characterized in that installed on the first bypass line. A second bypass line is formed extending from the second bypass point on the second recirculation line to the inlet side of the soot filtration device to reduce the back pressure of the exhaust gas; The second check valve is a check valve that is opened above a predetermined pressure, the engine system equipped with a vortex tube for EZ cooler replacement, characterized in that installed on the second bypass line. According to any one of claims 1 to 3, wherein the soot filtration device is a device for regenerating the EGX cooler replacement vortex tube, characterized in that for regenerating using the exhaust gas discharged from the warm outlet of the vortex tube. Engine system.

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