阅读说明：本技术 进气歧管、进气系统和汽车 (Air intake manifold, air intake system and car ) 是由 夏英子 王勇 陈柄林 李晓娟 安妮 王瑞平 肖逸阁 于 2021-08-23 设计创作，主要内容包括：本发明公开一种进气歧管、进气系统和汽车,其中,所述进气歧管包括：壳体,设有稳压腔、及与所述稳压腔均连通的进气口和出气口,所述出气口用以与发动机缸盖连接,所述进气口用以与中冷器连接,空气由所述进气口经所述稳压腔流向所述出气口；以及导流板,对应所述进气口设于所述稳压腔内,且设有若干沿气流方向延伸设置的过气孔,所述导流板的板面与所述出气口的长度方向呈相并行设置。本发明的技术方案能够提高进气歧管的气体分配均匀性。(The invention discloses an intake manifold, an intake system and an automobile, wherein the intake manifold comprises: the engine comprises a shell, a pressure stabilizing cavity, an air inlet and an air outlet, wherein the air inlet and the air outlet are communicated with the pressure stabilizing cavity; and the guide plate is arranged in the pressure stabilizing cavity corresponding to the air inlet and is provided with a plurality of air passing holes extending along the air flow direction, and the plate surface of the guide plate and the length direction of the air outlet are arranged in parallel. The technical scheme of the invention can improve the gas distribution uniformity of the air inlet manifold.)

1. An intake manifold, comprising:

the engine comprises a shell, a pressure stabilizing cavity, an air inlet and an air outlet, wherein the air inlet and the air outlet are communicated with the pressure stabilizing cavity; and

the guide plate corresponds the air inlet is located the steady voltage intracavity, the face and the air current direction of guide plate are crossing setting, the guide plate is equipped with a plurality of gas pockets of crossing, the extending direction of crossing the gas pocket be with the air current direction sets up in parallel mutually.

2. The intake manifold of claim 1, wherein the shell is flat with opposing first and second narrow walls and two wide walls connecting the first and second narrow walls, the first, second and wide walls collectively defining the plenum, the inlet port being disposed in one of the wide walls and adjacent the first narrow wall, and the baffle being disposed adjacent the first narrow wall.

3. The intake manifold of claim 2, wherein the baffle has one end connected to the first narrow shell wall and a gap between the other end and the second narrow shell wall, and both sides of the baffle are connected to the two wide shell walls, respectively.

4. The intake manifold of claim 3, wherein a ratio of the length of the baffle to the length of the outlet port is set to 0.25 to 0.5; and/or

The baffle is integrally formed with the housing; and/or

The shell is made of aluminum.

5. An intake manifold according to claim 2, wherein the second narrow casing wall extends obliquely in a direction away from the outlet port in a direction towards the inlet port.

6. The intake manifold of claim 2, wherein the baffle extends obliquely in a direction away from the outlet in a direction toward the second narrow casing wall.

7. The intake manifold of claim 1, wherein a plurality of the air passing holes are provided, and the air passing holes are distributed at intervals along the plate surface of the deflector.

8. The intake manifold of claim 1, wherein an outer edge of the intake port is provided with an intake flange for mounting with an intercooler, the intake flange being provided with a retaining groove for receiving a sealing ring; and/or

The orientation of the air inlet and the plate surface of the guide plate are arranged in parallel.

9. An air intake system comprising an intercooler and an intake manifold as claimed in any one of claims 1 to 8, the intake of the intake manifold being connected to the intercooler.

10. An automobile comprising the intake system of claim 9.

Technical Field

The invention relates to the technical field of intake manifolds, in particular to an intake manifold, an intake system and an automobile.

Background

In order to improve the dynamic responsiveness and the combustion effect of the engine, more and more engines select an integrated water-cooled intercooler technology, and the water-cooled intercooler can effectively reduce the air outlet temperature of a supercharger so as to reduce the risk of knocking of an engine cylinder. In the case of gasoline engines, air intake and fuel injection are two major factors mainly controlled by an electronic fuel injection technology, the maximum torque and power of the gasoline engine depend on the air intake to a great extent, and an air intake manifold is a key part determining the air intake effect.

The air intake manifold of the existing engine has defects in gas distribution, so that the air quantity obtained by each cylinder communicated with the air intake manifold is unbalanced, the combustion condition difference among the cylinders is large, and the engine vibration is large.

Disclosure of Invention

The invention mainly aims to provide an intake manifold, aiming at improving the gas distribution uniformity of the intake manifold.

To achieve the above object, the present invention provides an intake manifold comprising:

the engine comprises a shell, a pressure stabilizing cavity, an air inlet and an air outlet, wherein the air inlet and the air outlet are communicated with the pressure stabilizing cavity; and

the guide plate corresponds the air inlet is located the steady voltage intracavity, the face and the air current direction of guide plate are crossing setting, the guide plate is equipped with a plurality of gas pockets of crossing, the extending direction of crossing the gas pocket be with the air current direction sets up in parallel mutually.

Optionally, the housing is flat with opposing first and second narrow walls and two wide walls connecting the first and second narrow walls, the first, second and wide walls together defining the plenum, the inlet port being provided in one of the wide walls and disposed adjacent the first narrow wall, and the baffle being disposed adjacent the first narrow wall.

Optionally, one end of the flow guide plate is connected to the first narrow casing wall, a gap is provided between the other end of the flow guide plate and the second narrow casing wall, and two side edges of the flow guide plate are respectively connected to the two wide casing walls.

Optionally, a ratio of the length of the baffle to the length of the air outlet is set to 0.25 to 0.5.

Optionally, the baffle is integrally formed with the housing.

Optionally, the housing is made of aluminum.

Optionally, the second narrow housing wall extends obliquely in a direction away from the air outlet in a direction towards the air inlet.

Optionally, the baffle extends obliquely in a direction away from the air outlet in a direction towards the second narrow casing wall.

Optionally, the air passing holes are multiple, and the air passing holes are distributed at intervals along the plate surface of the guide plate.

Optionally, the outward flange of air inlet is equipped with the air inlet flange that is used for installing with the intercooler, the air inlet flange is equipped with the spacing groove that is used for accomodating the sealing washer.

Optionally, the orientation of the air inlet is parallel to the plate surface of the deflector.

The invention further provides an air inlet system which comprises an intercooler and the air inlet manifold, wherein an air inlet of the air inlet manifold is connected with the intercooler.

The invention further provides an automobile comprising the air inlet system.

In the technical scheme of the invention, the guide plate arranged in the pressure stabilizing cavity blocks and guides the air flowing in from the air inlet, so that the problem that most of the air directly flows to the air outlet from the air inlet along the shortest path is avoided, the air is distributed unevenly in the length direction of the air outlet, the gas distribution uniformity of the air inlet manifold is improved, the combustion condition difference among different cylinders is reduced, and the vibration problem of the engine is improved. It should be noted that the length direction of the air outlet is the arrangement direction of the cylinders; parallel refers to parallel and near parallel. In addition, compared with the structure that the intake manifold comprises a pressure stabilizing cavity and an intake branch pipeline in the prior art, the intake manifold has the structure of the pressure stabilizing cavity only, and the structure of the intake branch pipeline is integrated on the cylinder cover, so that the intake path of air entering the combustion chamber of the cylinder from the intake manifold is shortened, and the acceleration response of the engine is favorably improved; meanwhile, the structure of the intake manifold is simplified, the volume of the intake manifold is reduced, the manufacturing cost of the intake manifold is reduced, and the arrangement of the intake manifold in the engine room is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of an intake manifold according to the present invention;

FIG. 2 is a front view of the intake manifold of FIG. 1;

FIG. 3 is a top view of the intake manifold of FIG. 1;

fig. 4 is a cross-sectional view of the intake manifold of fig. 2 at a-a.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Air intake manifold	112	Second narrow shell wall
110	Shell body	113	Wide shell wall
				110a	Voltage stabilizing cavity	114	Air inlet flange
110b	Air inlet	115	Limiting groove
				110c	Air outlet	120	Flow guide plate
111	A first narrow housing wall	121	Air passing hole

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The air intake manifold of the existing engine has defects in gas distribution, so that the air quantity obtained by each cylinder communicated with the air intake manifold is unbalanced, the combustion condition difference among the cylinders is large, and the engine vibration is large. In view of this, the present invention provides an intake manifold, and referring to fig. 1 and 2, in an embodiment of the present invention, the intake manifold 10 includes:

the shell 110 is provided with a pressure stabilizing cavity 110a, an air inlet 110b and an air outlet 110c which are communicated with the pressure stabilizing cavity 110a, the air outlet 110c is used for being connected with an engine cylinder cover, the air inlet 110b is used for being connected with an intercooler, and air flows from the air inlet 110b to the air outlet 110c through the pressure stabilizing cavity 110 a; and

the guide plate 120 is arranged in the pressure stabilizing cavity 110a corresponding to the air inlet 110b, the plate surface of the guide plate 120 is intersected with the air flow direction, the guide plate 120 is provided with a plurality of air passing holes 121, and the extending directions of the air passing holes 121 are arranged in parallel with the air flow direction.

In the technical scheme of the invention, the air flowing in from the air inlet 110b is blocked and guided by the guide plate 120 arranged in the pressure stabilizing cavity 110a, so that the problem that most of air directly flows to the air outlet 110c from the air inlet 110b along the shortest path is avoided, and the air is distributed unevenly in the length direction of the air outlet 110c is solved, thereby improving the gas distribution uniformity of the air inlet manifold 10, further reducing the combustion condition difference among different cylinders, and improving the vibration problem of the engine. It should be noted that the length direction of the air outlet 110c is the arrangement direction of the cylinders; parallel refers to parallel and near parallel. In addition, compared with the structure that the intake manifold comprises a pressure stabilizing cavity a and an intake branch pipeline in the prior art, the intake manifold 10 in the technical scheme of the invention only has the structure of the pressure stabilizing cavity 110a, and the structure of the intake branch pipeline is integrated on the cylinder cover, so that the intake path of air entering the combustion chamber of the cylinder from the intake manifold 10 is shortened, and the acceleration response of the engine is favorably improved; meanwhile, the structure of the intake manifold 10 is simplified, so that the volume of the intake manifold 10 is reduced, the manufacturing cost of the intake manifold 10 is reduced, and the arrangement of the intake manifold 10 in the engine room is facilitated.

Referring to fig. 2 to 4, in the present embodiment, further, the casing 110 is flat and has a first narrow casing wall 111 and a second narrow casing wall 112 opposite to each other and two wide casing walls 113 connecting the first narrow casing wall 111 and the second narrow casing wall 112, the first narrow casing wall 111, the second narrow casing wall 112 and the wide casing walls 113 together define a pressure stabilizing chamber 110a, the gas inlet 110b is disposed on one wide casing wall 113 and is disposed near the first narrow casing wall 111, and the baffle plate 120 is disposed near the first narrow casing wall 111. Without loss of generality, the intercooler and the intake manifold 10 are usually arranged in an upper region within the cabin space and next to the engine, and since the engine occupies a large part of the cabin longitudinal arrangement space, so that the longitudinal arrangement space for the intercooler and the intake manifold 10 is extremely limited, the arrangement of the intercooler and the intake manifold 10 is facilitated by the fact that the intake manifold 10 is provided flat. Secondly, the air inlet 110b is offset at one side of the pressure stabilizing cavity 110a, which is beneficial to the butt joint and the installation and fixation of the air outlet end of the intercooler and the air inlet 110b of the intake manifold 10, and further beneficial to the arrangement of the intercooler at the outer side of the wide shell wall 113 of the intake manifold 10, and is beneficial to the shortening of the path of the air flowing into the intake manifold 10 from the intercooler. However, the design is not limited to this, in other embodiments, the casing may be flat, and has a first narrow casing wall and a second narrow casing wall which are opposite to each other, and two wide casing walls connecting the first narrow casing wall and the second narrow casing wall, where the first narrow casing wall, the second narrow casing wall, and the wide casing walls together define a pressure stabilizing chamber, the air inlet is disposed in the middle of one of the wide casing walls, and the flow guide plate is disposed in the middle of the pressure stabilizing chamber and has a gap with both the first narrow casing wall and the second narrow casing wall.

Referring to fig. 2 and 4, in this embodiment, further, optionally, one end of the baffle plate 120 is connected to the first narrow casing wall 111, a gap is provided between the other end of the baffle plate and the second narrow casing wall 112, and two sides of the baffle plate 120 are respectively connected to the two wide casing walls 113. When air flows in from the air inlet 110b, most of the air will impact on the baffle 120, flow to the second narrow casing wall 112 along the plate surface of the baffle 120, and flow to the air outlet 110c along the gap between the second narrow casing wall 112 and the baffle 120, so as to change the flow path of the air, and avoid most of the air from flowing to the air outlet 110c along the shortest path, and further enable the area of the air outlet 110c far away from the air inlet 110b to be distributed with enough air, that is, enable the cylinder far away from the air inlet 110b to be distributed with enough air. The air passing holes 121 arranged on the baffle 120 can control a small amount of air to directly flow to the cylinders close to the air inlet 110b through the air holes 121, so as to compensate the air intake amount of the cylinders close to the air inlet 110b, and finally, the air amount distributed by each cylinder tends to be consistent. In addition, due to the guiding function of the guiding plate 120, most of the air can flow in the pressure stabilizing cavity 110a along the length direction of the air outlet 110c, that is, along the direction of the multi-cylinder arrangement. Then, for the engine using the internal EGR (Exhaust Gas Recirculation) technology, the guide plate 120 can also perform the functions of guiding and distributing the Exhaust Gas flowing back from the combustion chamber of the cylinder ending the power stroke to the pressure stabilizing cavity 110a, so that the fresh air carrying the Exhaust Gas enters the cylinder entering the power stroke subsequently, and the Exhaust Gas is reciprocated, so that the gases involved in the power combustion are mixed with the Exhaust Gas with the consistent content, thereby reducing the difference of the combustion conditions among different cylinders and improving the vibration problem of the engine. Without loss of generality, for a four-stroke four-cylinder engine, with all four cylinders in different strokes, the four-cylinder work sequence is typically 1-3-4-2 or 1-2-4-3. Taking the four-cylinder work sequence of 1-3-4-2 as an example, assuming that the air outlet 110c is respectively communicated with 1 cylinder to 4 cylinders from one end close to the air inlet 110b to the other end along the length direction, and assuming that 1 cylinder exhausts, 2 cylinders inputs, 3 cylinders works and 4 cylinders compresses at the time, part of waste gas in the combustion chamber flows back to the pressure stabilizing cavity 110a when the air inlet and exhaust valves are overlapped in the 1 cylinder exhaust process, is mixed in fresh air under the influence of the flow of the fresh air and flows to the 2 cylinders in the air inlet stroke, and then part of the waste gas is wrapped by the fresh air and enters the combustion chamber of the 2 cylinders. When the cylinder 1 enters the next stroke, namely the intake stroke, the cylinder 2 is in the compression stroke, the cylinder 3 is in the exhaust stroke, and the cylinder 4 is in the power stroke; at the moment, the waste gas flowing back from the cylinder 3 to the pressure stabilizing cavity 110a flows to the cylinder 1 under the influence of the flow of the fresh air, and part of the waste gas flowing back from the cylinder 1 to the pressure stabilizing cavity 110a is wrapped by the fresh air and then enters the combustion chamber of the cylinder 1 again to participate in combustion. When the cylinder 1 enters the next stroke, namely the compression stroke, the cylinder 2 is in the power stroke, the cylinder 3 is in the air inlet stroke, and the cylinder 4 is in the air outlet stroke; at the moment, the waste gas flowing back to the pressure stabilizing cavity 110a from 4 cylinders flows to 3 cylinders under the influence of the flow of fresh air, and part of the waste gas flowing back to the pressure stabilizing cavity 110a from 3 cylinders is wrapped by the fresh air and then enters the 3-cylinder combustion chamber again to participate in combustion. By analogy, after the engine applies the internal EGR technology, the guide plate 120 and the air holes 121 thereon make the main airflow flow field formed by the fresh air in the pressure stabilizing cavity 110a more special, so that the exhaust gas flowing back into the pressure stabilizing cavity 110a can be influenced by the flow of the fresh air, is mixed in the fresh air and driven by the main airflow to flow along the length direction of the air outlet 110c, flows to and is distributed to other cylinders, and further, the gases involved in the working combustion are all mixed with exhaust gas with the content tending to be consistent, so that the fresh air content and the exhaust gas content used by different cylinders tend to be consistent when the different cylinders work combustion, and further, the combustion condition difference between the different cylinders is reduced, and the vibration problem of the engine is improved.

In order to ensure the consistency of the intake path length of each cylinder, in the present embodiment, optionally, the ratio of the length of the baffle 120 to the length of the air outlet 110c is set to 0.25 to 0.5. It can be understood that if the length of the baffle 120 is set too long, the gap between the baffle 120 and the second narrow casing wall 112 is too small, and the air flows to the air outlet 110c through the gap, the air inflow at the end of the air outlet 110c close to the air inlet 110b may not be ensured, in order to solve this problem, more air passing holes 121 and larger air passing holes 121 may need to be arranged to compensate the air inflow of the cylinder close to the air inlet 110b, and such a structure will make the air flow to the air outlet 110c substantially along the direction perpendicular to the air outlet 110c, which is not favorable for making the main air flow establish a special flow field, and is not favorable for improving the distribution uniformity of the exhaust gas. If the length of the baffle 120 is set too short, the flow guiding effect of the baffle 120 is significantly reduced, which is not favorable for establishing a special flow field for the main air flow, and is further not favorable for improving the distribution uniformity of the fresh air.

Referring to fig. 2, a front view of the intake manifold 10 of the present embodiment is shown, in which regions (r) to (r) on the air outlet correspond to cylinders 1 to 4 of a four-cylinder engine, respectively. Alternatively, the ratio of the length of the baffle 120 to the length of the air outlet 110c is set to 0.35 to 0.4. For a four-cylinder engine, assuming that the air outlet 110c is respectively communicated with 1 cylinder to 4 cylinders from one end close to the air inlet 110b to the other end along the length direction, the length of the guide plate 120 is arranged to extend to a position corresponding to the middle of the second cylinder, so that fresh air can establish a superior main air flow field in the pressure stabilizing cavity 110a, and further, the distribution uniformity of the fresh air and the waste gas is improved.

Referring to fig. 4, in the present embodiment, optionally, in the direction toward the air inlet 110b, the second narrow casing wall 112 extends obliquely in the direction away from the air outlet 110 c. The second narrow casing wall 112 is obliquely extended, so that the air guided by the guide plate 120 can flow more smoothly to the air outlet 110c, and the air flows more smoothly in the pressure stabilizing cavity 110a, thereby being beneficial to reducing the aerodynamic noise. However, the design is not limited to this, and in other embodiments, the extending direction of the second narrow casing wall may be perpendicular to the plate surface direction of the baffle.

Referring to fig. 4, in the present embodiment, optionally, the baffle 120 extends obliquely in a direction away from the air outlet 110c in a direction toward the second narrow casing wall 112. The guide plate 120 is obliquely and extendedly arranged, so that the air can be guided to a position far away from the air outlet 110c, the air has a longer distribution path, the air can be more uniformly distributed to different areas flowing to the air outlet 110c, meanwhile, one side of the guide plate 120 facing the air outlet 110c can also play a role in guiding the air flow flowing to the first narrow shell wall 111, a dead zone flow field is prevented from being formed between one side of the guide plate 120 facing the air outlet 110c and the first narrow shell wall 111, the flowability of the air is further improved, and the air intake amount obtained by each cylinder tends to be consistent.

Referring to fig. 2, in the present embodiment, optionally, a plurality of air passing holes 121 are provided, and the plurality of air passing holes 121 are distributed at intervals along the plate surface of the baffle 120. The air inflow required to be compensated to the cylinder close to the air inlet 110b is divided into a plurality of air flows through the air passing holes 121, so that the energy of each air flow can be reduced, the interference effect of the air flows passing through the air passing holes 121 on the flow field close to the air outlet 110c area can be reduced, the flow field is more stable and controllable, and the air distribution uniformity of the air inlet manifold 10 is further ensured.

Referring to fig. 2, in the present embodiment, optionally, the number of the air passing holes 121 is set to be 8 to 12, and the ratio of the aperture of the air passing hole 121 to the length of the baffle 120 is set to be 0.05 to 0.1. It can be understood that if the aperture of the gas passing hole 121 is set too small, the gas flow is likely to cause a squeal problem when passing through the gas hole 121; if the aperture of the gas passing hole 121 is set too large, the energy of the gas passing through the gas passing hole 121 is large, which disturbs the flow field near the gas outlet 110c area, and thus is not favorable for the gas distribution uniformity of the intake manifold 10.

In order to reduce the manufacturing cost of the intake manifold 10, in the present embodiment, the baffle 120 is optionally integrally formed with the housing 110.

In this embodiment, optionally, the housing 110 is made of aluminum. Since the intake manifold 10 is connected to both the intercooler and the engine, the vibration of the intercooler and the engine may be affected, and the casing 110 is made of aluminum, so as to improve the vibration mode performance of the intake manifold 10, and further reduce the vibration degree of the intake manifold 10. However, the design is not limited thereto, and in other embodiments, the housing may also be made of steel, magnesium alloy, or magnesium-aluminum alloy.

Referring to fig. 3, in the present embodiment, an air inlet flange 114 is disposed on an outer edge of the air inlet 110b for mounting with an intercooler, and the air inlet flange 114 is disposed with a limiting groove 115 for receiving a sealing ring. The air inlet flange 114 and the intercooler are provided with the sealing ring in a clamping mode, so that the air tightness of the connecting position between the air inlet flange 114 and the intercooler can be improved, the limiting groove 115 can enable the sealing ring to be limited in the designed position and not prone to shifting, the abutting area of the flange and the sealing ring in the near term can be improved, and the air tightness of the connecting position can be further improved.

Referring to fig. 3 and 4, in the present embodiment, the air inlets 110b are optionally oriented parallel to the plate surface of the baffle 120. The air flowing from the air inlet 110b first impacts the wide shell wall 113 and then rebounds to flow towards the baffle 120 and the second narrow shell wall 112, so as to avoid the problem of aerodynamic noise caused by the fact that most of the air directly impacts the baffle 120, and further to facilitate improvement of the NVH performance of the intake manifold 10. However, the design is not limited thereto, and in other embodiments, the direction of the air inlet is intersected with the plate surface of the air deflector.

The present invention further provides an intake system, including an intercooler and the intake manifold, where the specific structure of the intake manifold refers to the above embodiments, and since the intake system adopts all technical solutions of all the above embodiments, the intake system at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein. Wherein, the air inlet of air intake manifold is connected with the intercooler.

The present invention further provides an automobile, including the foregoing intake system, and the specific structure of the intake manifold of the intake system refers to the foregoing embodiments, and since the automobile adopts all the technical solutions of all the foregoing embodiments, the automobile at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, and details are not repeated herein.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.