INTEGRATED EXHAUST DUCT AND SUBSTRATE PROCESSING APPARATUS

The present disclosure provides an integrated exhaust duct and a substrate processing apparatus. The integrated exhaust duct according to the present disclosure includes: an integrated duct body having a plurality of exhaust regions and an exhaust hole communicating with the plurality of exhaust regions; and a hole partition wall disposed inside the exhaust hole to divide the exhaust hole so that the plurality of exhaust regions are blocked from communicating with each other by passing through the exhaust hole.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims benefit of priority to Korean Patent Application No. 10-2022-0178878 and 10-2023-0045117 filed on Dec. 20, 2022, and Apr. 6, 2023, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference in their entirety.

BACKGROUND

The present disclosure relates to an integrated exhaust duct in which a plurality of exhaust ducts are connected and a substrate processing apparatus including the same.

2. Description of Related Art

In order to manufacture semiconductor devices or liquid crystal displays, various processes such as photolithography, etching, ashing, ion injection, and thin film deposition may be performed on a substrate. Before or after such a process is performed, a process of cleaning and drying the substrate to remove contaminants and particles generated in each process is performed.

In a process chamber in which a process for the substrate is performed, an exhaust line is configured to form an internal atmosphere. Fumes generated inside the process chamber during the process are discharged externally thereof through the exhaust line.

Meanwhile, as the exhaust line of the process chamber is connected to an exhaust duct, a plurality of exhaust lines formed in a plurality of process chambers are connected to a plurality of exhaust ducts, and in this case, the plurality of exhaust ducts are connected by an integrated exhaust duct and then exhausted.

However, there may be a limitation in that gas particles may collide with each other within the integrated exhaust duct or collides by an internal structure of the duct, resulting in an occurrence of an eddy current, which may increase exhaust pressure loss.

PRIOR ART REFERENCE

Patent Document

SUMMARY

The present disclosure is configured to address the aforementioned problem, and an aspect of the present disclosure is to provide an integrated exhaust duct and substrate processing apparatus that can minimize a loss of exhaust pressure.

According to an aspect of the present disclosure, an integrated exhaust duct may include: an integrated duct body having a plurality of exhaust regions and an exhaust hole communicating with the plurality of exhaust regions; and a hole partition wall disposed inside the exhaust hole to divide the exhaust hole so that the plurality of exhaust regions are blocked from communicating with each other by passing through the exhaust hole.

The exhaust region may include a plurality of duct connection portions to which a plurality of exhaust ducts are connected, and a common exhaust path formed from the plurality of duct connection portions to the exhaust hole, and in the common exhaust path, an exhaust path partition wall may be disposed so that a plurality of individual exhaust paths are formed from the plurality of duct connection portions to the exhaust hole.

According to an embodiment, an outlet of each of the plurality of duct connection portions may be formed in a direction different from a direction oriented toward the exhaust hole, and the individual exhaust path may be divided into a plurality of portions from the duct connection portion to the exhaust hole, wherein each of the plurality of portions may extend straight, and each of a connection portion between the duct connection portion and the individual exhaust path and a connection portion between the plurality of portions may be bent and a gap angle thereof may be formed to be an obtuse angle.

According to another embodiment, an outlet of each of the plurality of duct connection portions may be formed in a direction different from a direction oriented to the exhaust hole, and the individual exhaust path may be curved from the duct connection portion to the exhaust hole.

The exhaust hole may have an internal side surface inclined toward a center direction of the exhaust hole as it approaches an outlet of the exhaust hole.

An end of the exhaust path partition wall may protrude to an interior of the exhaust hole and may be inclined in a direction, opposite to the outlet of the exhaust hole.

The duct connection portion may be formed so that an inlet thereof is perpendicular to an outlet thereof, and a valve having a guide inclined surface for guiding a direction of gas may be installed in a portion in which the inlet and the outlet of the duct connection portion communicate with each other.

A cross-sectional area of the duct connection portion, a cross-sectional area of the individual exhaust path, and a cross-sectional area of each divided portion of the exhaust hole, through which gas flows in the integrated duct body, may be formed to sequentially increase.

Two exhaust regions may be formed as a set, and the two common exhaust paths of the two exhaust regions may be disposed to correspond to each other with the exhaust hole interposed therebetween.

Meanwhile, according to an aspect of the present disclosure, an integrated exhaust duct may include: an integrated duct body having a plurality of exhaust regions and an exhaust hole communicating with the plurality of exhaust regions; and a hole partition wall disposed inside the exhaust hole to divide the exhaust hole so that a plurality of exhaust regions are blocked from communicating with each other by passing through the exhaust hole, wherein the exhaust region may include a plurality of duct connection portions to which a plurality of exhaust ducts are connected, and a common exhaust path formed from the plurality of duct connection portions to the exhaust hole, and the duct connection portion may have two outlets formed in opposite directions, and the two exhaust holes may be disposed to be spaced apart from each other, wherein the two common exhaust paths for connecting the two outlets and the two exhaust holes may be disposed to correspond to each other with the duct connection portion interposed therebetween.

Furthermore, according to an aspect of the present disclosure, a substrate processing apparatus may include: a plurality of process chambers in which processes are performed on each substrate; a plurality of exhaust ducts connected to a plurality of exhaust lines formed in the plurality of process chambers; and an integrated exhaust duct connected to the plurality of exhaust ducts, wherein the integrated exhaust duct may include: an integrated duct body having a plurality of exhaust regions and an exhaust hole communicating with the plurality of exhaust regions; and a hole partition wall disposed inside the exhaust hole to divide the exhaust hole so that the plurality of exhaust regions are blocked from communicating with each other passing through the exhaust hole, wherein the exhaust region may include a plurality of duct connection portions to which a plurality of exhaust ducts are connected, and a common exhaust path formed from the plurality of duct connection portions to the exhaust hole.

In the present disclosure, since a hole partition wall is configured in an exhaust hole communicating with a plurality of exhaust regions, the plurality of exhaust regions may be blocked from communicating with each other by passing through the exhaust hole, thereby stabilizing the internal pressure while minimizing a loss of exhaust pressure.

Furthermore, in the present disclosure, since an exhaust path partition wall is disposed so that a plurality of individual exhaust paths are formed in a common exhaust of an exhaust region, a plurality of gas currents in a plurality of duct connection portions flow individually in a plurality of individual exhaust paths without joining in a common exhaust path, thereby stabilizing internal pressure while reducing a loss of exhaust pressure.

DETAILED DESCRIPTION

Hereinafter, preferred example embodiments will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present disclosure. However, in describing preferred example embodiments of the present disclosure in detail, when it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. Furthermore, the same reference numbers are used throughout the drawings to refer to the same or similar portions. Furthermore, in the present specification, it may be understood that the expressions such as “on,” “above,” “upper,” “below”, “beneath,” “lower,” and “side,” merely indicated based on drawings, and may actually vary depending on the direction in which the components are disposed.

Furthermore, throughout the specification, the terms “connected to” or “coupled to” are used to designate a connection or coupling of one element to another element and include both a case where an element is “directly connected or coupled to” another element and a case where an element is “indirectly connected or coupled to” another element via still another element. Furthermore, when a certain portion “includes” or “comprises” a certain component, this indicates that other components are not excluded and may be further included unless otherwise noted.

FIG.4is a plan view illustrating a process chamber of a substrate processing apparatus according to an embodiment of the present disclosure.FIG.5is a view illustrating an interior of the process chamber ofFIG.4.

Referring to the drawings, a substrate processing apparatus1000of the present disclosure includes a process chamber100performing a process on a substrate W with a liquid. In the process chamber100, the process is performed on the substrate W in a state in which the substrate W is horizontally maintained. The process may be a process of etching a nitride film formed on the substrate W. In this case, the liquid may include phosphoric acid. Furthermore, the process chamber100may be used in a process of removing foreign substances and membranes remaining on a surface of the substrate W using various liquids.

Specifically, the process chamber100provides a sealed internal space, and a fan filter unit110is installed on an upper portion thereof. The fan filter unit110generates vertical airflow inside the process chamber100. The fan filter unit110is configured to modularize a filter and an air supply fan into one unit, and filters clean air and supplies the clean air to the process chamber100. After the clean air passes through the fan filter unit110, the clean air is supplied to the process chamber100to form a vertical airflow. The vertical airflow provides a uniform airflow to an upper portion of the substrate W, and discharges and eliminates pollutants (fumes) generated in a process of processing the surface of the substrate W with a processing fluid, to discharge lines131,132and133, through bowls210,220and230of a processing vessel200together with air, thereby maintaining a high level of cleanliness inside a processing container.

The process chamber100includes a process region100aand a maintenance region100bpartitioned by a horizontal partition wall101. The horizontal partition wall101is equipped with a driving member293of an elevating unit290and a driving member490of a nozzle unit400. Furthermore, the maintenance region100bis a space in which discharge lines131,132and133and an exhaust line120connected to a processing container200are disposed, and the maintenance region100bmay be isolated from the process region100aon which the substrate W is processed.

The substrate processing apparatus1000of the present disclosure may include a processing container200, a support unit300, and a nozzle unit400in a process chamber100. The processing container200is installed inside the process chamber100, has an upper portion having an open cylindrical shape, and provides a processing space for processing the substrate W. The open upper surface of the processing container200is provided as a passage for loading and unloading the substrate W. Here, the support unit300is disposed in the processing space. In this case, the support unit300supports the substrate W during the process and rotates the substrate W.

Furthermore, the processing container200provides an upper space200ain which a spin head310of the support unit300is disposed, and a lower space200bin which an exhaust collection unit250is connected to a lower portion thereof for performing forced exhaust. The exhaust collection unit250is connected to an exhaust line120extending to the outside of the process chamber100. In an upper space200aof the processing container200, annular first, second, and third bowls210,220and230for introducing and intaking chemicals and gas scattered on a rotating substrate W are disposed in multiple stages. The first, second, and third bowls210,220and230have exhaust ports h communicating with one common annular space (corresponding to the lower space of the processing container).

Here, the first, second, and third bowls210,220and230provide first to third recovery spaces RS1, RS2and RS3in which airflow including liquids and fumes scattered from the substrate W is introduced. A first recovery space RS1is formed to be partitioned by the first bowl210, a second recovery space RS2is formed as a separation space between the first bowl210and the second bowl220, and the third recovery space RS3is formed as a separation space between the second bowl220and the third bowl230.

Furthermore, the processing container200is coupled to an elevating unit290for changing a vertical position of the processing container200. The elevating unit290linearly moves the processing container200in a vertical direction. As the processing container200is moved up and down, a relative height of the processing container200with respect to the spin head310is changed. The elevating unit290has a bracket291, a moving shaft292, and a driving member293. The bracket291is fixedly installed on an external wall of the processing container200, and the moving shaft292, which is moved in the vertical direction by the driving member293, is fixed coupled to the bracket291. When the substrate W is loaded on the spin head310or unloaded from the spin head310, the processing container200is lowered so that the spin head310protrudes to an upper portion of the processing container200.

Furthermore, during the process, a height of the processing container200is adjusted so that liquid may flow into predetermined bowls210,220and230) according to the type of liquid supplied to the substrate W. Accordingly, a relative vertical position between the processing container200and the substrate W is changed. Accordingly, the processing container200may change the type of liquid and pollutant gas recovered for each recovery space RS1, RS2and RS3.

The support unit300is installed inside the processing container200. The support unit300supports the substrate W during the process and may be rotated by a driving member330during the process. Furthermore, the support unit300has a spin head310having a circular upper surface. A plurality of support pins311for supporting the substrate W and a plurality of chucking pins312are provided on an upper surface of the spin head310. A plurality of support pins311are spaced apart at regular intervals at an edge portion of the upper surface of the spin head310and are disposed in a certain arrangement, and are provided to protrude upwardly from the spin head310. The support pin311supports a lower surface of the substrate W so that the substrate W is supported while being spaced apart from the spin head310in an upward direction. Each of the plurality of chucking pins312are disposed outside the support pin311, and the chucking pins312are provided to protrude upwardly. The plurality of chucking pins312align the substrate W so that the substrate W supported by the plurality of support pins311is disposed in a given position on the spin head310. During the process, the plurality of chucking pins312are in contact with a side portion of the substrate W to prevent the substrate W from deviating from the given position. A support shaft320for supporting the spin head310is connected to a lower portion of the spin head310, and the support shaft320is rotated by the driving member330connected to the lower portion thereof. In this case, the driving member330is provided with a motor and the like, and with a rotation of the support shaft320by the driving member330, the spin head310and the substrate W rotate.

Furthermore, the nozzle unit400discharges the liquid to the substrate W supported by the support unit300. The nozzle unit400may be a moving nozzle device400M or a fixed nozzle device400F. In this case, a plurality of mobile nozzle devices400M may be installed outside the processing container200.

FIG.6is a view illustrating an integrated exhaust duct connected to the process chamber ofFIG.5,FIG.7is a view illustrating a flow direction of gas in the integrated exhaust duct ofFIG.6, andFIG.8is a view illustrating a flow line of gas in the integrated exhaust duct ofFIG.6.

Referring to the drawings, the substrate processing apparatus1000(seeFIG.5) according to an embodiment of the present disclosure includes a plurality of process chambers100(seeFIG.5), a plurality of exhaust ducts500(seeFIGS.5and6), and an integrated exhaust duct600.

A process chamber100may be configured so that a process is performed on a substrate therein, and have an internal structure as illustrated inFIG.5. That is, the process chamber100has an exhaust line120formed therein, and when a plurality of process chambers100are provided, a plurality of exhaust lines may be provided. For reference, one exhaust line may be formed in one process chamber, and a plurality of exhaust lines may be formed.

Furthermore, an exhaust line120of the process chamber100is connected to an exhaust duct500(seeFIG.5) and when a plurality of exhaust lines are provided, the plurality of exhaust ducts500(seeFIG.6) may be provided.

Furthermore, the integrated exhaust duct600is connected to the plurality of exhaust ducts500, and the integrated exhaust duct600may minimize a loss of exhaust pressure by arranging an exhaust path partition wall2W so that a plurality of individual exhaust paths612aare formed in a common exhaust path612.

An integrated exhaust duct10according to the conventional art takes the same structure as that ofFIGS.1to3, and in the process of combining a plurality of gas airflows in a common exhaust path12, the plurality of gas airflows may collide with each other, thus significantly causing exhaust pressure loss.

Specifically, in the integrated exhaust duct10of the conventional art, a plurality of gas airflows introduced through a plurality of duct connection portions11collide with each other when they join in the common exhaust path12, resulting in an occurrence of an eddy current, as illustrated inFIG.3, and in this process, a large exhaust pressure loss may be caused.

On the other hand, the integrated exhaust duct600according to an embodiment of the present disclosure illustrated inFIGS.6to8has a plurality of individual exhaust paths612ain the common exhaust path612to minimize a loss of exhaust pressure.

The integrated exhaust duct600according to an embodiment of the present disclosure includes an integrated duct body DB in which a plurality of exhaust regions610and an exhaust hole620are formed.

The exhaust region610includes a plurality of duct connection portions611and a common exhaust path612.

The duct connection portion611is a portion to which the exhaust duct500is connected, and as the duct connection portion611is provided in a plural form, a plurality of exhaust ducts500are connected to the plurality of duct connection portions611.

Furthermore, the common exhaust path612is formed from the plurality of duct connection portions611to the exhaust hole620. In other words, the plurality of duct connection portions611are connected to the common exhaust path612, and accordingly, a plurality of gas airflows introduced through the plurality of duct connection portions611join. Furthermore, the common exhaust path612is formed from the plurality of duct connection portions611to the exhaust hole620, thus forming a flow path through which the plurality of joined gas airflow flows to the exhaust hole620.

However, when the plurality of gas airflows join in the common exhaust path612, they collide with each and cause the eddy current, which may result in a significant loss of the exhaust pressure. To prevent the phenomenon, an exhaust path partition wall2W is disposed in the common exhaust path612of the present disclosure to form a plurality of individual exhaust paths612a.

In other words, the plurality of gas airflows are introduced from the plurality of duct connection portions611in the common exhaust path612, and in order to prevent the plurality of gas airflows from colliding with each other at the time of introducing the plurality of gas airflows and minimize the occurrence of the eddy current, the exhaust path partition wall2W is disposed so that each of the plurality of gas airflows independently flow from the plurality of duct connection portions611to the exhaust hole620through the plurality of individual exhaust paths612a.

In other words, in the present disclosure, a plurality of individual exhaust paths612aare formed in the common exhaust path612to correspond to each of the plurality of gas airflows, and the exhaust path partition wall2W is disposed in the common exhaust path612to form the plurality of individual exhaust paths612a. For example, as illustrated in the drawing, three exhaust path partition walls2W may be disposed in order to form four individual exhaust paths612ainside one common exhaust path612.

Furthermore, the individual exhaust path612aof the present disclosure is configured not to collide vertically with an internal side surface when gas flows, thereby minimizing the loss of the exhaust pressure.

The integrated exhaust duct10according to conventional art takes the same structure as that ofFIGS.1to3, and the loss of the exhaust pressure may occur significantly because the gas airflows collide vertically with an internal side surface of the common exhaust path12, resulting in a large exhaust pressure loss.

Specifically, the common exhaust path12of the integrated exhaust duct10according to the conventional art takes an internal flow path structure in which the gas airflows introduced through the duct connection portion11vertically collide with the internal side surface of the common exhaust path12, resulting in an eddy current, and in this process, the loss of the exhaust pressure may be significantly caused.

On the other hand, the common exhaust path612of the integrated exhaust duct600according to an embodiment of the present disclosure illustrated inFIGS.6to8does not have a structure in which the individual exhaust path612ais vertically bent, in order to prevent the large exhaust pressure loss. For this reason, the present disclosure can minimize the exhaust pressure loss by preventing the gas airflows from vertically colliding with an internal side surface of the individual exhaust path612a(a side surface of the exhaust path partition wall2W or a side surface of an edge wall of the common exhaust path612) when the gas airflows flow into the individual exhaust path612afrom the duct connection portion611.

The plurality of duct connection portions611are spaced apart from each other in a direction away from the exhaust hole620, and an outlet of each of the plurality of duct connection portions611is formed in a different direction from the exhaust hole620. Under the condition, the individual exhaust path612adoes not reach the exhaust hole620without changing a direction from an outlet direction of the duct connection portion611, and accordingly, if the individual exhaust path612ahas a vertically bent structure, the large exhaust pressure loss may be caused because the gas airflows vertically collide with the internal side surface of the individual exhaust path612a(the side surface of the exhaust path partition wall2W or the side surface of the edge wall of the common exhaust path612).

Accordingly, according to an embodiment, the individual exhaust path612aof the present disposed is divided into a plurality of portions from the duct connection portion611to the exhaust hole620, each of the plurality of portions extends straight, each of a connection portion between the duct connection portion611and the individual exhaust path612aand a connection portion between the plurality of portions is bent, and a gap angle thereof is formed to be an obtuse angle. The above-described connection portions may be prevented from being rapidly bent (e.g., a gap angle as an acute angle) or being vertically bent, and accordingly, the gas airflows in the individual exhaust path612amay smoothly flow without the occurrence of the eddy current, thereby minimizing the loss of the exhaust pressure.

As a specific example, as illustrated in the drawing, the individual exhaust path612amay be divided into a first portion1P and a second portion20P from the duct connection portion611to the exhaust hole620, and since each of a connection portion between the duct connection portion611and the first portion1P and a connection portion of the first portion1P and the second portion2P has a bent structure in which a gap angle thereof is an obtuse angle, the gas airflows may be prevented from vertically colliding with the internal side surface of the individual exhaust path612a, thereby minimizing the loss of the exhaust pressure.

Furthermore, according to another embodiment, although not illustrated in the drawing, the individual exhaust path612amay have a structure which is curved from the duct connection portion611to the exhaust hole620. Accordingly, the loss of the exhaust pressure loss may be minimized by preventing the gas airflows from vertically colliding with the internal side surface of the individual exhaust path612a.

Meanwhile, in the integrated exhaust duct600of the present disclosure, a hole partition wall1W may be disposed in the exhaust hole620, thereby minimizing the loss of the exhaust pressure.

The integrated exhaust duct10according to the conventional art has the same structure as that ofFIGS.1to3, and as two exhaust regions10ahaving the common exhaust path12are provided to face each other with the exhaust hole13interposed therebetween, the gas airflows flowing from the two exhaust regions10ato the exhaust hole13collide with each other, resulting in a large loss of the exhaust pressure.

Specifically, in the integrated exhaust duct10of the conventional art, the plurality of gas airflows collide with each other when the gas airflows introduced through the plurality of exhaust regions10ajoin in the exhaust hole13, resulting in the large loss of the exhaust pressure in this process.

On the other hand, in the integrated exhaust duct600according to an embodiment of the present disclosure illustrated inFIGS.6to8, the hole partition wall1W is disposed inside the exhaust hole620so that the exhaust hole620is divided, in order to minimize the loss of the exhaust pressure.

Specifically, in the integrated exhaust duct600according to an embodiment of the present disclosure, a plurality of exhaust regions610are formed in the integrated exhaust duct600. In this case, two exhaust regions610may be formed as a set, and two common exhaust paths612of the two exhaust regions610may be disposed to correspond to each other with the exhaust hole620interposed therebetween, as illustrated in the drawing. Furthermore, when the duct connection portion611has two outlets and the two outlets are formed in opposite directions, two common exhaust paths612may be formed in both sides of the duct connection portion611by including the duct connection portion611in common, thereby forming a total of four exhaust regions610as shown in the drawings.

In the integrated exhaust duct600, the hole partition wall1W is disposed inside the exhaust hole620so that the exhaust hole620is divided, in order to prevent the plurality of exhaust regions610from communicating with each other by passing through the exhaust hole620. In other words, for example, as described in the drawing, in order to prevent two exhaust regions610facing each other from communicating with each other by passing through the exhaust hole620, the hole partition wall1W may be disposed in the middle of the interior of the exhaust hole620in a longitudinal direction such that the exhaust hole620is bisected.

If there is no hole partition wall1W in the exhaust hole620, a plurality of gas airflows in the plurality of exhaust regions610join in the exhaust hole620. In this manner, when the plurality of gas airflows join, gas particles may collide with each other, and in the present disclosure, a hole partition wall1W is disposed inside the exhaust hole620so that the exhaust hole620is divided to block such joining.

In other words, in the present disclosure, the hole partition wall1W is disposed in the exhaust hole620to correspond to each of the plurality of gas airflows, and as an example, in one exhaust hole620, one hole partition wall1W may be disposed to correspond to two exhaust regions610, as illustrated in the drawing.

Furthermore, the exhaust hole620may be formed so that an internal side surface621thereof becomes inclined toward the center of the exhaust hole620as it approaches an outlet direction of the exhaust hole620.

The exhaust hole620may be disposed in a direction, perpendicular to a direction of the individual exhaust path612aof the exhaust region610, and in the structure condition, the internal side surface621of the exhaust hole620may be inclined to allow gas from the individual exhaust path612ato flow smoothly into the exhaust hole620.

That is, the internal side surface621of the exhaust hole620may be inclined toward the center of the exhaust hole620as it approaches the outlet direction of the exhaust hole620, and accordingly, when the gas from the individual exhaust path612aflows into the exhaust hole620, it may change a direction obliquely rather than vertically. Accordingly, the gas from the individual exhaust path612amay be smoothly introduced into the exhaust hole620, thereby reducing the loss of the exhaust pressure.

Furthermore, an end2Wa of the exhaust path partition wall2W may protrude to the interior of the exhaust hole620and take a structure inclined in an opposite direction of the outlet of the exhaust hole620. Specifically, as each end2Wa of the plurality of exhaust path walls2W protrudes toward the interior of the exhaust hole620, a plurality of gas airflows introduced into the exhaust hole620from a plurality of individual exhaust paths612amay be maintained for a predetermined period of time, and accordingly, even if the gas joins eventually in the exhaust hole620, the occurrence of the eddy current may be minimized.

Furthermore, the end2Wa of the exhaust path partition wall2W may have a structure inclined in the opposite direction of the outlet of the exhaust hole620in addition to the condition of protruding to the interior of the exhaust hole620. Among the gas airflows just introduced into the exhaust hole620, the gas airflows at the outlet of the exhaust hole620(i.e., gas airflows in a lower side of the drawing) changes a direction to the outlet direction of the exhaust hole620without generating the eddy current, due to the inclined structure of the internal side surface621of the exhaust hole620. On the other hand, the gas airflows (i.e., gas airflows in an upper side of the drawing) on the opposite side of the outlet of the exhaust hole620may generate relatively more eddy currents when changing a direction thereof. In consideration of the condition, the end2Wa of the exhaust path partition wall2W protrudes to the interior of the exhaust hole620and is simultaneously inclined in the opposite direction of the outlet of the exhaust hole620, and accordingly, the plurality of gas airflows on the opposite side of the outlet of the exhaust hole620just introduced into the exhaust hole620from the plurality of individual exhaust paths612amay be maintained for a predetermined period of time, thereby reducing the occurrence of the eddy current.

Meanwhile, the duct connection portion611may be formed so that an inlet611athereof is perpendicular to an outlet611bthereof. In this case, a valve V having a guide inclined surface Vt for guiding a direction of the gas may be installed in a portion in which the inlet611aand the outlet611bof the duct connection portion611communicate with each other.

Specifically, the valve V is installed in the duct connection portion611and has the guide inclined surface Vt, and in this case, the guide inclined surface Vt is formed in the portion in which the inlet611aand the outlet611bcommunicate with each other inside the duct connection portion611. In this manner, as the valve V has the guide inclined surface Vt for guiding the direction of the gas, the gas may smoothly change a direction without vertically colliding with an internal surface of the valve V When the gas changes a direction from the inlet611ato the outlet611b, thereby reducing the loss of the exhaust pressure. For reference, as the guide inclined surface Vt inside the valve V is rotated by the driving member Vm disposed at the bottom, the gas may flow to one of the two outlets formed in one duct connection portion611, or to both outlets.

Furthermore, a cross-sectional area of the duct connection portion611, a cross-sectional area of the individual exhaust path612a, and a cross-sectional area of each divided portion of the exhaust hole620, through which the gas flows in the integrated duct body DB, may be formed to sequentially increase. In this manner, a flow cross-sectional area of the gas gradually may increase in a direction of the gas flowing from the duct connection portion611to the exhaust hole620, thereby reducing the loss of the exhaust pressure and stably exhausting the gas.

Accordingly, in the present disclosure, the hole partition wall1W may be configured in the exhaust hole620communicating with the plurality of exhaust regions610, and the plurality of exhaust regions610may be blocked from communicating with each other by passing through the exhaust hole620, thereby stabilizing the internal pressure while minimizing the loss of the exhaust pressure.

Furthermore, according to the present invention, the exhaust path partition wall2W may be disposed so that the plurality of individual exhaust paths612aare formed in the common exhaust path612of the exhaust region610, and the plurality of gas airflows from the plurality of duct connection portions611may flow individually in the plurality of individual exhaust paths612awithout joining in the common exhaust path612, thereby stabilizing the internal pressure while reducing the loss of the exhaust pressure.

Although example embodiments of the present disclosure have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that the present disclosure may be implemented in other specific forms without changing its technical concepts or essential features. Therefore, it should be understood that the example embodiments described above are exemplary and not limited in all respects.