KR101950601B1 - Mixing chamber unit for exhaust gas cleaning device - Google Patents

Abstract

A mixing chamber unit of an exhaust gas purifying apparatus according to an embodiment of the present invention includes a chamber housing integrally formed at one end of an SCR unit and connected to a connection pipe for guiding the exhaust gas to one side of the chamber housing, An outlet part is connected to one end of the SCR unit so as to discharge a mixed gas of the urea and the exhaust gas to the SCR unit so that the urea and the exhaust gas are discharged to the inner space of the chamber housing, And a gas discharge pipe disposed in the chamber housing so as to partition the internal space of the chamber housing into a first chamber and a second chamber in a direction away from the SCR unit, A chamber dividing member for guiding from the chamber to the second chamber; Chamber unit. The connection pipe and the injection nozzle may be connected to the first chamber, and the inlet of the gas discharge pipe may be connected to the second chamber.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mixing chamber unit for an exhaust gas purifying apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixing chamber unit of an exhaust gas purifying apparatus, and more particularly, to a mixing chamber unit of an exhaust gas purifying apparatus capable of realizing miniaturization of an exhaust gas purifying apparatus by integrally forming a mixing chamber unit at one end of an SCR unit Unit.

2. Description of the Related Art Generally, an exhaust gas purifying apparatus is an apparatus that removes harmful components included in exhaust gas by treating exhaust gas generated in an internal combustion engine.

In recent years, exhaust gas emission regulations have been strengthened due to global warming and increased air pollution. Particularly in the case of diesel engines, harmful particulates such as carbon monoxide, hydrocarbons, and nitrogen oxides, .

Therefore, an apparatus equipped with an internal combustion engine such as a diesel engine or the like is provided with an exhaust gas purifying device to prevent harmful particulates of the exhaust gas from being discharged to the atmosphere.

The exhaust gas purifying apparatus may be used in various ways depending on the fuel main component of the engine, the combustion efficiency, the engine shape, and the like. For example, a selective catalytic reduction (SCR) system using a urea, a diesel oxidation catalyst (DOC) system, or a diesel particulate filter (DPF) system .

Particularly, in a construction machine or an agricultural machine, in which a diesel engine is used, a purification performance of the exhaust gas is enhanced by using various exhaust gas purifiers in combination.

For example, a combined exhaust gas purifying apparatus is typically used in which a mixing pipe for mixing urea into exhaust gas is connected between a DOC (or DPF) and an SCR. However, the exhaust gas purifying apparatus of the above-described combined type has a disadvantage that the entire size thereof becomes very large and becomes large.

Therefore, in recent years, research and development have been actively carried out to variously change the connection structure and arrangement structure of the DOC, the SCR, and the urea mixing pipe in order to form a compact exhaust gas purifying apparatus.

For example, in Korean Registered Patent No. 10-1251518 (entitled "Dosing Module for Exhaust Gas Aftertreatment System of Vehicle", Registered on Apr. 31, 2013), a reducing agent is injected along the flow direction of the exhaust gas in front of the SCR An exhausting module for an exhaust gas aftertreatment system of a vehicle is disclosed. That is, the dosing body of the dosing module is integrally formed at the tip of the DPF and is connected to the tip of the SCR.

Korean Patent No. 10-1669657 (entitled " SDPF Mixing Apparatus ", issue date: Oct. 20, 2016) discloses a mixing apparatus for SDPF which is applicable to an exhaust system of a type in which an oxidation catalyst unit and SDPF are arranged side by side, Device is disclosed. That is, in the state that the oxidation catalyst unit and the SDPF are arranged side by side, the mixing apparatus connects the opposite end portions of the oxidation catalyst unit and the SDPF.

An embodiment of the present invention provides a mixing chamber unit of an exhaust gas purifying apparatus capable of realizing downsizing of an exhaust gas purifying apparatus by integrally forming a mixing chamber unit at one end of an SCR unit.

Further, the embodiment of the present invention provides a mixing chamber unit of an exhaust gas purifying apparatus which can form a mixing chamber unit very compactly while sufficiently ensuring the mixing efficiency of exhaust gas and urea.

In addition, the embodiment of the present invention can improve the mixing performance with urea by flowing the exhaust gas in the form of a vortex, and is capable of uniformly delivering the mixed gas of the exhaust gas and the urea to the SCR unit. Provide a unit.

One embodiment of the present invention relates to a mixing chamber unit of an exhaust gas purifying apparatus for mixing urea with exhaust gas flowing into an SCR unit.

According to an embodiment of the present invention, there is provided an exhaust gas purifying apparatus comprising: a chamber housing integrally formed at one end of an SCR unit and connected to a connection pipe for guiding the exhaust gas to one side thereof; A gas discharge pipe having an outlet connected to one end of the SCR unit so as to discharge a mixed gas of the urea and the exhaust gas to the SCR unit and an inlet part disposed in an inner space of the chamber housing, And an internal space of the chamber housing is disposed inside the chamber housing so as to be divided into a first chamber and a second chamber in a direction away from the SCR unit and is guided from the first chamber to the second chamber while swirling the mixed gas. The mixing chamber unit comprising a chamber dividing member for separating the exhaust gas from the exhaust gas.

The connection pipe and the injection nozzle may be connected to the first chamber, and the inlet of the gas discharge pipe may be connected to the second chamber.

Therefore, in the present embodiment, since the chamber housing is integrally formed at the end portion of the SCR unit, the exhaust gas purifying apparatus can be downsized, and the inside of the chamber housing can be connected to the first chamber and the second chamber The mixing efficiency of the mixing chamber unit can be maximized since the exhaust gas is vortexed and mixed with the urea.

According to an aspect, the gas discharge pipe may be disposed to penetrate the center portion of the first chamber to connect the SCR unit and the second chamber. The exhaust gas may form a vortex in the first chamber in a shape pivoted about the gas discharge pipe.

The outlet portion of the gas discharge pipe may have the same size as one end of the SCR unit and may be connected to one end of the SCR unit. The inlet of the gas discharge pipe may be smaller than the outlet of the gas discharge pipe and may be disposed to pass through the center of the chamber dividing member.

A guide vane for guiding the mixed gas introduced from the second chamber to one end of the SCR unit may be formed at an inlet of the gas discharge pipe.

Further, the gas discharge pipe may be formed in a funnel shape in which the passage becomes narrower from the outlet portion to the inlet portion.

The outlet of the gas discharge pipe may be formed in a curved section of a convex shape toward the inside of the chamber housing so that a space is small between the inner side surfaces of the chamber housing.

The injection nozzle may be disposed in the chamber housing to inject the urea into the inclined surface of the gas discharge tube and to inject the gas at a position spaced apart from the connection pipe in the direction of swirling of the exhaust gas.

According to one aspect, a mixing chamber unit of an exhaust gas purifying apparatus according to an embodiment of the present invention is configured such that the exhaust gas introduced from the connecting pipe forms a vortex around the gas discharge pipe inside the first chamber And a vortex forming guide disposed on one side of the chamber housing.

The vortex formation guide may include a pipe connection formed at one side of the chamber housing and connected to an end of the connection pipe, and a pipe connecting part formed at the pipe connection part so that the exhaust gas forms a vortex in a set direction inside the first chamber. And a vortex forming part extending long into the interior of the one chamber.

The tube connection part may be formed in a pipe shape corresponding to the end of the connection pipe, and the vortex formation part may be extended in a tubular shape from the pipe connection part toward the gas discharge pipe. A discharge port may be formed at one side of the vortex forming part for discharging the exhaust gas in a setting direction on the surface of the gas discharge pipe so that the exhaust gas flowing into the pipe connecting part forms a vortex pivoting around the gas discharge pipe have.

The end of the vortex forming part may be in close contact with the surface of the gas discharge pipe or may be connected to the surface of the gas discharge pipe.

According to an aspect of the present invention, the chamber partition member may include a partition panel disposed inside the chamber housing to partition the internal space of the chamber housing into the first chamber and the second chamber, A guide hole portion formed in the partition panel so as to guide the mixed gas from the first chamber to the second chamber, and a guide hole portion formed in the partition panel so as to guide the mixed gas from the first chamber to the guide hole portion, And guide vanes inclined to the guide holes to form vortexes.

The guide vane may protrude obliquely toward the second chamber in the vortex direction of the mixed gas in the guide hole portion.

The guide holes may be spaced apart from each other around the discharge hole along the periphery of the partition panel. The guide vanes may be respectively disposed in the guide hole portions.

The chamber partitioning member may further include an overpressure prevention hole portion formed in a groove shape or a hole shape at an edge portion of the partition panel to prevent an internal pressure of the first chamber or the second chamber from increasing beyond a set pressure have.

Here, the overvoltage preventing hole may be narrower or smaller than the guide hole, and a plurality of overvoltage preventing holes may be spaced apart from each other along the circumference of the partition panel.

The overpressure prevention hole may be formed at an edge portion of the partition panel so as to be located forward of the position of the injection nozzle in the direction of swirling the mixed gas.

Since the mixing chamber unit of the exhaust gas purifying apparatus according to the embodiment of the present invention has a structure in which the chamber housing is integrally formed at one end of the SCR unit, the mixing chamber unit and the SCR unit are integrally formed, Can be realized. That is, in this embodiment, the SCR unit and the mixing chamber unit can be arranged in parallel with the DOC unit, and the length of the connection pipe connecting the mixing chamber unit and the DOC unit can be made very short.

Also, the mixing chamber unit of the exhaust gas purifying apparatus according to the embodiment of the present invention divides the inside of the chamber housing into the first chamber and the second chamber by using the chamber dividing member, and then, while vapourizing the exhaust gas, The mixing efficiency of the exhaust gas and the urea can be maximized and the mixing chamber unit can be formed very compactly by utilizing the inner space of the chamber housing very effectively.

Further, the mixing chamber unit of the exhaust gas purifying apparatus according to the embodiment of the present invention can very easily generate a vortex of the exhaust gas inside the chamber housing by using the vortex formation guide, and by using the vortex flow of the exhaust gas The mixing performance with urea can be further improved. In addition, in this embodiment, a mixed gas of exhaust gas and urea is vortexed and then discharged through a funnel-shaped gas discharge pipe to the SCR unit. Thus, the mixed gas is uniformly transferred to the inside of the SCR unit to secure the performance of the SCR unit can do.

 In the mixing chamber unit of the exhaust gas purifying apparatus according to the embodiment of the present invention, the mixed gas is vortically flowed by the guide hole portion formed in the chamber dividing member and the guide vane and smoothly guided from the first chamber to the second chamber And it is possible to prevent the internal pressure of either the first chamber or the second chamber from being overpressured to a set pressure or more by the overpressure prevention hole portion formed in the chamber partitioning member.

1 and 2 are a perspective view and a plan view showing an exhaust gas purifying apparatus having a mixing chamber unit according to an embodiment of the present invention.
3 is a cross-sectional view taken along the line AA shown in Fig.
Fig. 4 is a cross-sectional view taken along the line BB shown in Fig. 2. Fig.
5 is a cross-sectional view taken along the line CC shown in Fig.
FIG. 6 is a perspective view showing a main configuration of the mixing chamber unit shown in FIG. 1; FIG.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

1 and 2 are a perspective view and a plan view showing an exhaust gas purification apparatus 10 having a mixing chamber unit 100 according to an embodiment of the present invention.

1 and 2, an exhaust gas purifying apparatus 10 according to an embodiment of the present invention includes a DOC unit 20, an SCR unit 30, a connecting pipe 40, and a mixing chamber unit 100, .

DOC unit 20 of the NO ₂ in a purification unit of the diesel oxidation catalyst (Diesel Oxidation Catalyst, DOC) scheme, through the high temperature to give carbon monoxide and hydrocarbons reduce, using the catalytic reaction, gives a lift of particulate material, the exhaust gas The cost can be increased. The inlet 22 of the DOC unit 20 can be connected to the diesel engine to allow exhaust gas to be exhausted from the diesel engine (not shown).

SCR unit 30 can have selective reduction catalyst (Selective Catalytic Reduction, SCR) as a way the purification unit of the NO _X (nitrogen oxides) in the exhaust gas through a catalytic reaction using a urea turn with water and nitrogen is harmless to the human body. The DOC unit 20 and the SCR unit 30 may be arranged in parallel to each other. The outlet 32 of the SCR unit 30 can be configured to exhaust the exhaust gas processed by the DOC unit 20 and the mixing chamber unit 100 and the SCR unit 30 into the atmosphere.

The connecting pipe 40 is a tubular member for guiding the exhaust gas processed in the DOC unit 20 to the mixing chamber unit 100. Both ends of the connecting pipe 40 are connected to the DOC unit 20 and the mixing chamber unit 100, 0.0 > 100 < / RTI >

The mixing chamber unit 100 may be integrally formed at the end of the SCR unit 30. [ The mixing chamber unit 100 as described above is a unit for mixing the exhaust gas delivered from the connection pipe 40 with the urea and then delivering the mixed gas to the SCR unit 30. A nozzle bracket 112 may be formed in the chamber housing of the mixing chamber unit 100 and an injection nozzle 120 may be disposed in the nozzle bracket 112 to inject urea into the chamber housing 110 .

FIG. 3 is a cross-sectional view taken along the line AA shown in FIG. 2, FIG. 4 is a cross-sectional view taken along the line BB shown in FIG. 2, Fig. 6 is a perspective view showing a main structure of the mixing chamber unit 100 shown in FIG.

2 to 5, a mixing chamber unit 100 according to an embodiment of the present invention includes a chamber housing 110, a spray nozzle 120, a gas discharge pipe 130, and a chamber partition member 140 .

The chamber housing 110 may be integrally formed at one end of the SCR unit 30. In one example, the chamber housing 110 may be formed by coupling to the housing of the SCR unit 30 or by extending the housing of the SCR unit 30. [

Here, a space for mixing the exhaust gas G1 and the urea U may be formed in the chamber housing 110 at a predetermined size. The inner space of the chamber housing 110 may be partitioned into the first chamber 110a and the second chamber 110b by the chamber partition member 140. [ The first chamber 110a may be formed at one end of the chamber housing 110 connected to one end of the SCR unit 30 and the second chamber 110b may be formed at one end of the chamber housing 110 connected to the SCR unit 30. [ And may be formed at the other end of the chamber housing 110 to position the first chamber 110a.

A nozzle bracket 112 may be formed at one side of the chamber housing 110 so that the end of the connection pipe 40 may be connected to the nozzle chamber 110 and the spray nozzle 120 may be disposed at the other side of the chamber housing 110 .

The injection nozzle 120 is a device for injecting the urea U into the chamber housing 110. The injection nozzle 120 may be inserted and fixed in a mounting hole of the nozzle bracket 112 formed on the other side of the chamber housing 110. The injection angle and the injection position of the injection nozzle 120 may be determined by the nozzle bracket 112.

Here, the injection nozzle 120 may be arranged to inject the urea U toward the inclined portion 136 of the gas discharge pipe 130, which will be described later. The injection nozzle 120 may be arranged to inject the urea U at a position spaced a predetermined distance from the connecting pipe 40 toward the swirling direction V of the exhaust gas G1.

2 to 6, the gas discharge pipe 130 is a member for discharging the mixed gas G2 in which the urea U is mixed with the exhaust gas G1 to one end of the SCR unit 30. That is, the gas discharge pipe 130 may be formed in a tubular shape to guide the mixed gas G2 from the interior of the chamber housing 110 to one end of the SCR unit 30. [

The outlet 132 of the gas discharge pipe 130 may be formed to have the same size as the one end of the SCR unit 30 and may be connected to the one end of the SCR unit 30. The inlet 134 of the gas discharge pipe 130 may be smaller than the outlet 132 of the gas discharge pipe 130 and may be disposed in the inner space of the chamber housing 110. The inlet 134 of the gas discharge pipe 130 may be connected to the second chamber 110b so as to pass through the center of the chamber dividing member 140. [

The gas discharge pipe 130 may be disposed in the chamber housing 110 so as to pass through the center of the first chamber 110a. The exhaust gas G1 flowing into the first chamber 110a of the chamber housing 110 from the connection pipe 40 is circulated around the gas discharge pipe 130 and flows through the inner circumference of the first chamber 110a It can flow in a vortex shape. The space through which the exhaust gas G1 flows in the first chamber 110a may be formed in a donut shape between the outer surface of the gas discharge pipe 130 and the inner surface of the chamber housing 110 have.

3 and 6, the gas discharge pipe 130 according to the present embodiment may be formed in a funnel shape in which the passage becomes narrower from the outlet 132 to the inlet 134.

The inlet portion 134 of the gas discharge pipe 130 may be formed to be long in the shape of a tube of the same diameter and may be inserted into the center portion of the chamber partition member 140 so as to be penetrated. A guide vane 138 may be formed at the inlet 134 of the gas discharge pipe 130. The guide vane 138 is a structure for smoothly guiding the mixed gas G2 flowing into the second chamber 110b to the SCR unit 30. [

The guide vanes 138 may be disposed at the inlet portion 134 of the gas discharge pipe 130 in a crossed shape. The guide vane 138 may be formed to be long toward the outlet portion 132 at the inlet portion 134 of the gas exhaust pipe 130 but may be formed in the guide vane 138 such that the swirling flow of the exhaust gas G1 is not changed into a rectilinear flow. May be formed to be equal to or shorter than the set length. However, the layout structure, shape and number of the guide vanes 138 according to the present embodiment can be variously modified according to the design conditions and conditions of the mixing chamber unit 100.

The outlet 132 of the gas discharge pipe 130 may be formed in a curved section of a convex shape toward the inside of the chamber housing 110. The space formed between the outlet 132 of the gas discharge pipe 130 and the inner surface of the chamber housing 110 is very small or omitted so that the outlet 132 of the gas discharge pipe 130 and the chamber housing 110 The residual amount of the exhaust gas G1 remaining in the space between the inner surfaces of the exhaust gas G1 and the exhaust gas G2 can be reduced.

An inclined portion 136 formed at an angle may be formed between the inlet portion 134 and the outlet portion 132 of the gas discharge pipe 130. The inclined portion 136 may have a structure in which the diameter increases from the inlet portion 134 to the outlet portion 132.

3 to 6, the chamber partitioning member 140 is a member for partitioning the internal space of the chamber housing 110 into the first chamber 110a and the second chamber 110b, Can be passed from the first chamber 110a to the second chamber 110b and the swirling flow of the mixed gas G2 can be maintained when the mixed gas G2 passes.

The first chamber 110a and the second chamber 110b may be sequentially arranged in the inner space of the chamber housing 110 along the direction away from the SCR unit 30. The first chamber 110a and the second chamber 110b may be sequentially arranged. The two chambers 110b may be formed facing each other on both sides of the chamber partition member 140 with respect to the chamber partition member 140. [ The connection pipe 40 and the injection nozzle 120 may be connected to the first chamber 110a and the inlet portion 134 of the gas discharge pipe 130 may be connected to the second chamber 110b.

3 to 6, the chamber partitioning member 140 may include a partition panel 142, a discharge hole 144, a guide hole 146, and a guide vane 148.

The partition panel 142 is a member for partitioning the internal space of the chamber housing 110 into the first chamber 110a and the second chamber 110b. The partition panel 142 may be disposed inside the chamber housing 110 such that the inner surface of the chamber housing 110 and the edge of the partition panel 142 are in close contact with each other. Accordingly, the partition panel 142 may be formed in a plate shape corresponding to the sectional shape of the inner space of the chamber housing 110. [

The discharge hole 144 may be formed in a hole shape at the center of the partition panel 142. The discharge hole 144 may be connected to the inlet 134 of the gas discharge pipe 130. The discharge hole 144 may discharge the mixed gas G2 in the second chamber 110b, (130).

The guide hole portion 146 may be formed in a hole shape in the partition panel 142. The guide hole 146 may guide the mixed gas G2 from the first chamber 110a to the second chamber 110b. Here, the guide hole 146 may be disposed so that a plurality of the guide holes 146 are spaced from each other along the circumference of the partition panel 142 around the discharge hole 144.

Hereinafter, in the present embodiment, it is assumed that the guide hole portion 146 is formed as a slit-like arc shape and radially arranged on the partition panel 142 with the discharge hole portion 144 as a center. However, the present invention is not limited thereto, and the guide hole 146 may be formed in various shapes and arrangements in the partition panel 142 according to the design conditions and conditions of the mixing chamber unit 100.

The guide wing 148 may be formed to be inclined in the guide hole 146. [ That is, the guide vane 148 can vortex the mixed gas G2 passing through the guide hole portion 146. [ The guide wing 148 may protrude obliquely toward the second chamber 110b in the direction of vortex flow of the mixed gas G2 in the guide hole 146. [ The guide vanes 148 may be disposed in the guide holes 146, respectively. Therefore, the mixed gas G2 can keep the vortical flow state by the guide vane 148 in the process of passing through the guide hole portion 146.

The chamber dividing member 140 may further include an overpressure prevention hole 149 for preventing the internal pressure of the first chamber 110a or the second chamber 110b from increasing beyond the set pressure. The prevention hole 149 may be formed in the shape of a groove or a hole in the edge portion of the partition panel 142.

Here, the overpressure prevention hole 149 may be narrower or smaller than the guide hole 146. Therefore, the mixed gas G2 in the first chamber 110a can be more preferentially flowed into the second chamber 110b than the overpressure prevention hole 149 through the guide hole 146. [

The overpressure prevention hole 149 may be disposed on the edge of the partition panel 142 along the periphery of the partition panel 142 so as to be spaced apart from each other. At this time, the plurality of overpressure prevention hole portions 149 may be located forward of the arrangement position of the injection nozzle 120 in the swirling direction V of the mixed gas G2. When the overpressure prevention hole 149 is disposed as described above, the overpressure prevention hole 149 is formed before the exhaust gas G1 flowing into the first chamber 110a is mixed with the urea U of the injection nozzle 120 The second chamber 110b can be minimized.

2 through 6, the mixing chamber unit 100 according to an embodiment of the present invention is configured to mix the exhaust gas G1 flowing in the connecting pipe 40 with the gas And a vortex formation guide 150 that forms a vortex in the interior of the vortex 110a.

The vortex formation guide 150 may be disposed at one side of the chamber housing 110 for connecting the connection pipe 40. The vortex formation guide 150 may function to connect the end of the connection pipe 40 and the chamber housing 110 in a communicative manner and may be connected to the inside of the first chamber 110a It is also possible to perform the function of forming a vortex in the desired vortex direction V in the exhaust gas G1.

For example, the vortex forming guide 150 may include a tube connecting portion 152 and a vortex forming portion 154.

The pipe connection portion 152 may be formed in a structure connected to the end portion of the connection pipe 40. The pipe connection part 152 may be disposed to penetrate to one side of the chamber housing 110. That is, the pipe connection portion 152 may be formed in a pipe shape corresponding to the end portion of the connection pipe 40.

The vortex forming part 154 is a member for forming the vortex in the set vortex direction V with the exhaust gas G1 flowing into the first chamber 110a. The vortex forming part 154 may be formed to extend from the pipe connecting part 152 to the inside of the first chamber 110a.

Here, the vortex forming part 154 may be elongated in a tubular shape from the pipe connecting part 152 toward the gas discharge pipe 130. The end of the vortex forming part 154 may be in close contact with the surface of the gas discharge pipe 130 or may be connected to the surface of the gas discharge pipe 130.

A discharge port 156 may be formed at one side of the vortex forming portion 154 to discharge the exhaust gas G1 in the first chamber 110a in the vortex direction V. [ That is, the discharge port 156 may be configured to discharge the exhaust gas G1 flowing into the pipe connecting portion 152 to the surface of the gas discharge pipe 130, and the exhaust gas G1 may be discharged around the gas discharge pipe 130 G1 to swirl to form a vortex of the exhaust gas G1.

For example, the vortex forming portion 154 may be projected obliquely in the vortex direction V toward the gas discharge tube 130 in the first chamber 110a at the tube connecting portion 152 in the form of a tube having an outlet at an end portion thereof . Alternatively, the vortex forming portion 154 may protrude toward the gas discharge tube 130 in the first chamber 110a at the tube connecting portion 152 at the end in the form of a closed tube, and the end side surface of the vortex forming portion 154 The discharge port 156 may be formed toward the vortex direction V. The vortex forming portion 154 may be formed in a baffle structure extending obliquely in the vortex direction V toward the gas discharge tube 130 in the first chamber 110a in the pipe connecting portion 152 . In this embodiment, the vortex forming portion 154 is extended to the surface of the gas discharge pipe 130 in a tubular shape, and the discharge port 156 is formed in one side of the vortex forming portion 154 in the vortex direction V .

The operation of the exhaust gas purifying apparatus 10 according to an embodiment of the present invention with respect to the mixing chamber unit 100 will now be described.

The DOC unit 20 first purifies the exhaust gas G1 and the connection pipe 40 guides the exhaust gas G1 purified by the DOC unit 20 to the mixing chamber unit 100 .

The exhaust gas G1 as described above flows into the first chamber 110a of the chamber housing 110 through the vortex forming guide 150 connected to the connection pipe 40. [

Specifically, the exhaust gas G1 flows from the connecting pipe 40 to the pipe connecting portion 152 of the vortex forming guide 150, and then flows into the vortex forming portion 154 of the vortex forming guide 150 along the vortex forming portion 154 (V) in the interior of the first chamber 110a. At this time, the exhaust gas G1 is swirled along the surface of the gas discharge pipe 130 around the gas discharge pipe 130, and flows in a vortex shape inside the first chamber 110a.

When the exhaust gas G1 flows into the first chamber 110a, the injection nozzle 120 injects the urea U into the first chamber 110a to discharge the exhaust gas G1 and the urea U, . At this time, the exhaust gas G1 flows into the interior of the first chamber 110a while being mixed with the urea U.

The mixed gas G2 in which the exhaust gas G1 and the urea U are mixed flows into the guide hole portion 146 of the chamber partition member 140 while being swirled around the gas discharge pipe 130 in the first chamber 110a To the second chamber 110b.

The mixed gas G2 passing through the guide hole 146 flows into the second chamber 110b while being swirled by the guide vanes 148 of the chamber partition member 140. [ That is, the mixed gas G2 is supplied from the first chamber 110a to the second chamber 110b while stably maintaining the eddy current state by the guide hole portion 146 and the guide vane 148 of the chamber partition member 140 Flow.

The mixed gas G2 flowing into the second chamber 110b is continuously vortically flown in the same direction as the swirl direction in the first chamber 110a and is connected to the discharge hole 144 of the chamber partition member 140 And then flows into the inlet 134 of the gas discharge pipe 130.

The inclined portion 136 of the gas discharge pipe 130 guides the flow of the mixed gas G2 flowing into the inlet portion 134 to gradually increase the flow cross sectional area of the mixed gas G2, The outlet portion 132 uniformly discharges the mixed gas G2 to the entire area of one end of the SCR unit 30. [

The mixed gas G2 flowing into the inlet 134 of the gas discharge pipe 130 is discharged to the outlet of the gas discharge pipe 130 by the guide vane 138 formed at the inlet 134 of the gas discharge pipe 130. [ (132).

Since the guide vane 138 is not formed longer than the predetermined length in the inlet 134 of the gas discharge pipe 130, the mixed gas G2 is discharged from the inlet 134 of the gas discharge pipe 130 to the outlet 134 of the gas discharge pipe 130, It is possible to form a spiral vortex that flows and circulates from the inlet portion 134 of the gas discharge pipe 130 toward the outlet portion 132 instead of forming a linear laminar flow toward the outlet portion 132 of the gas discharge pipe 130. Therefore, the mixed gas G2 can uniformly flow along one end of the SCR unit 30 along the gas discharge pipe 130. [

Although the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, And various modifications and changes may be made thereto without departing from the scope of the present invention. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the claims set forth below, fall within the scope of the present invention.

10: Exhaust gas purifier
20: DOC unit
30: SCR unit
40: Connection piping
100: Mixing chamber unit
110: chamber housing
110a: first chamber
110b: second chamber
120: injection nozzle
130: gas discharge pipe
140: chamber partition member
150: vortex formation guide
G1: Exhaust gas
G2: Mixed gas
U: Urea

Claims (17)

A mixing chamber unit of an exhaust gas purifying apparatus for mixing urea with an exhaust gas flowing into an SCR unit,
A chamber housing integrally formed at one end of the SCR unit and connected to a connection pipe for guiding the exhaust gas to one side; An injection nozzle disposed on the other side of the chamber housing to inject the urea into the chamber housing; A gas exhaust pipe having an outlet connected to one end of the SCR unit to discharge a mixed gas of the urea and the exhaust gas to the SCR unit and an inlet part disposed in an inner space of the chamber housing; And an inlet portion of the gas discharge pipe communicating with the second chamber is disposed in the chamber housing so as to partition the internal space of the chamber housing into a first chamber and a second chamber in a direction away from the SCR unit, A chamber dividing member disposed in the chamber to guide the mixed gas from the first chamber to the second chamber while swirling the mixed gas; And a vortex formation guide disposed at one side of the chamber housing for connecting the connection pipe and vortexing the exhaust gas flowing in the connection pipe about the gas discharge pipe inside the first chamber,
The connection pipe and the injection nozzle are connected to the first chamber, the inlet of the gas discharge pipe is connected to the second chamber,
Wherein the gas discharge pipe is arranged in a shape penetrating the center of the first chamber inside the chamber housing to connect the SCR unit and the second chamber,
The outlet of the gas discharge pipe is formed to have the same size as the one end of the SCR unit and connected to one end of the SCR unit. The inlet of the gas discharge pipe is formed to be smaller than the outlet of the gas discharge pipe, And is disposed so as to penetrate through the central portion thereof,
The vortex formation guide may include a pipe connection portion that is disposed to pass through one side of the chamber housing and is connected to an end portion of the connection pipe; And a vortex forming portion extending long from the pipe connecting portion to the inside of the first chamber so that the exhaust gas forms a vortex in a set direction inside the first chamber and an end portion disposed on the surface of the gas outlet pipe ,
Wherein the tube connection part is formed in a tubular shape corresponding to an end of the connection pipe and the vortex forming part is elongated in a pipe shape from the pipe connection part toward the gas discharge pipe,
A discharge port for discharging the exhaust gas in a setting direction is formed on one surface of the gas discharge pipe so that the exhaust gas flowing into the pipe connecting portion forms a vortex turning around the gas discharge pipe in a set direction Lt; / RTI &
The exhaust gas flows in a vortex shape along the inner periphery of the first chamber while being swung around the gas discharge pipe by the vortex formation guide in the first chamber, and the urea and the urea injected from the injection nozzle Mixed,
The mixed gas in which the exhaust gas and the urea are mixed flows in a direction away from the SCR unit while being vortically swirled between the first chamber and the gas discharge pipe by the vortex formation guide, Flows into the second chamber and flows in a vortex shape inside the second chamber and flows toward the SCR unit along the inside of the gas discharge pipe.
delete delete The method according to claim 1,
And a guide vane for guiding the mixed gas introduced from the second chamber to one end of the SCR unit is formed at an inlet of the gas discharge pipe.
The method according to claim 1,
Wherein the gas discharge pipe is formed in a funnel shape in which the passage becomes narrower from the outlet portion to the inlet portion.
6. The method of claim 5,
Wherein the outlet portion of the gas discharge pipe is formed in a curved cross-section of a convex shape toward the inside of the chamber housing so that a space is formed between the inner side surfaces of the chamber housing.
6. The method of claim 5,
Wherein the injection nozzle is disposed in the chamber housing so as to inject the urea into an inclined surface of the gas discharge pipe and to jet the gas at a position spaced apart from the connection pipe in the direction of the swirling flow of the exhaust gas. Mixing chamber unit of the device.
delete delete delete The method according to claim 1,
Wherein the end of the vortex forming part is in close contact with the surface of the gas discharge pipe or connected to the surface of the gas discharge pipe.
8. The method according to any one of claims 1 to 7,
Wherein the chamber partitioning member comprises:
A partition panel disposed inside the chamber housing to partition the inner space of the chamber housing into the first chamber and the second chamber;
A discharge hole portion formed in the center of the partition panel in a hole shape and connected to an inlet portion of the gas discharge pipe;
A guide hole formed in the partition panel in a hole shape to guide the mixed gas from the first chamber to the second chamber; And
A guide vane slantingly formed in the guide hole portion so that the mixed gas passing through the guide hole portion forms a vortex;
Wherein the mixing chamber unit comprises a plurality of mixing chambers.
13. The method of claim 12,
Wherein the guide vane protrudes obliquely toward the second chamber in the direction of vortex flow of the mixed gas in the guide hole portion.
13. The method of claim 12,
Wherein the guide hole portion is disposed along the periphery of the partition panel so that a plurality of the guide hole portions are spaced from each other around the discharge hole portion,
Wherein the guide vanes are respectively disposed in the guide hole portions of the mixing chamber unit.
13. The method of claim 12,
Wherein the chamber partitioning member comprises:
An overpressure prevention hole portion formed in a shape of a groove or a hole in an edge portion of the partition panel to prevent an inner pressure of the first chamber or the second chamber from increasing to a set pressure or more;
Further comprising: a mixing chamber unit for mixing the exhaust gas and the exhaust gas.
16. The method of claim 15,
Wherein the overpressure prevention hole portion is formed to be narrower or smaller than the guide hole portion, and a plurality of the overpressure prevention hole portions are spaced from each other along the periphery of the partition panel.
17. The method of claim 16,
Wherein the overpressure prevention hole portion is formed at an edge portion of the partition panel so as to be located forward of the position of the injection nozzle in the direction of vortex of the mixed gas.

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