阅读说明：本技术 低阻力低噪音装置及机动运载工具 (Low-resistance low-noise device and motor vehicle ) 是由 查戈成 于 2018-07-20 设计创作，主要内容包括：本发明涉及空气动力学技术领域,尤其涉及一种低阻力低噪音装置及机动运载工具。该低阻力低噪音装置,其外壳体的外壳前端设置有第一外壳开口；内壳体至少部分的设置在外壳体的内部,且内壳体的内壳前端靠近第一外壳开口；外壳体的内表面和内壳体的外表面之间形成主通道；沿外壳体的轴向,主通道靠近外壳前端的截面积不小于靠近外壳后端的截面积；沿垂直于外壳体的轴向,外壳体的内表面和内壳体的外表面中至少一个表面设置有延伸至所在表面的端面的波纹部。该机动运载工具包括低阻力低噪音装置。本发明的目的在于提供低阻力低噪音装置及机动运载工具,以降低噪音和减小阻力。(The invention relates to the technical field of aerodynamics, in particular to low-resistance low-noise devices and a motor vehicle, wherein the front end of an outer shell of the low-resistance low-noise device is provided with a th outer shell opening, an inner shell is at least partially arranged inside the outer shell, the front end of an inner shell of the inner shell is close to a th outer shell opening, a main channel is formed between the inner surface of the outer shell and the outer surface of the inner shell, the cross section area of the main channel close to the front end of the outer shell is not smaller than that close to the rear end of the outer shell along the axial direction of the outer shell, and at least surfaces of the inner surface of the outer shell and the outer surface of the inner shell are provided with corrugated parts extending to the end surfaces of the main channel along the axial direction perpendicular to the outer shell.)

1, low-resistance and low-noise devices, which are characterized by comprising an outer shell, an inner shell and a connecting piece, wherein the outer shell is connected with the inner shell through the connecting piece;

the shell body is provided with a shell front end and a shell rear end corresponding to the shell front end along the axis direction of the shell body, wherein the shell front end is provided with an -th shell opening, and the shell rear end is provided with a second shell opening corresponding to the -th shell opening;

the inner shell is at least partially arranged inside the outer shell, and the front end of the inner shell is close to the th outer shell opening;

a main passage is formed between the inner surface of the outer shell and the outer surface of the inner shell, so that the airflow flows from the th shell opening to the second shell opening through the main passage;

at least of the inner surface of the outer housing and the outer surface of the inner housing in an axial direction perpendicular to the outer housing are provided with corrugations extending to the end faces of the surfaces.

2. The low-drag low-noise apparatus according to claim 1, wherein the corrugations of at least of the inner surface of the outer housing and the outer surface of the inner housing pass through the origin at any point on a curve arbitrarily determined with respect to , where Y is h + a sin (nx + α);

wherein x is the circumferential distance between a unit point on the curve and an origin;

y is the distance perpendicular to the circumferential direction between the unit point on the curve and the origin;

h is the average height of the curve to the axis of the outer shell;

a is the ripple amplitude of the curve on the surface perpendicular to the axial direction of the outer shell;

n is the wave number of the curve in any 0-2 pi interval along the x line;

α is the phase angle of the origin.

3. The low drag, low noise apparatus of claim 2 wherein the inner surface of the outer housing is corrugated adjacent the front end of the housing and correspondingly has an origin comprising an th origin, the curve comprising a th curve passing through the th origin, the th curve being Y₁＝h₁+A₁·sin(n₁x₁+α₁) (ii) a In the formula, x₁Is the circumferential distance between the unit point on the th curve and the th origin point₁The distance between the unit point on the th curve and the th origin point is h₁Is the average height of the th curve to the axis of the outer shell, A₁The amplitude of the corrugation of the th curve along the plane perpendicular to the axial direction of the outer shell is n₁The wave number of the th curve in any 0-2 pi interval along the x line, α₁Phase angle at origin ;

the internal surface of shell body is close to the shell rear end is provided with the ripple portion, and is corresponding, and the initial point includes the second initial point, and the curve includes the second curve through the second initial point, the second curve is: y is₂＝h₂+A₂·sin(n₂x₂+α₂) (ii) a In the formula, x₂The circumferential distance between the unit point on the second curve and the second origin is set; y is₂The distance perpendicular to the circumferential direction between the unit point on the second curve and the second origin is shown; h is₂Is the average height of the second curve to the axis of the outer shell; a. the₂The amplitude of the corrugation on the surface of the second curve along the direction perpendicular to the axial direction of the outer shell is obtained; n is₂Wave number of the second curve in any 0-2 pi interval along the x line α₂A phase angle that is a second origin;

the surface of interior casing is close to the inner shell front end is provided with the ripple portion, and is corresponding, and the initial point includes the third initial point, and the curve includes the third curve through the third initial point, the third curve is: y is₃＝h₃+A₃·sin(n₃x₃+α₃) (ii) a In the formula, x₃The circumferential distance between a unit point on the third curve and a third origin is set; y is₃The distance perpendicular to the circumferential direction between the unit point on the third curve and the third origin is shown; h is₃Is the average height of the third curve to the axis of the outer shell; a. the₃The amplitude of the ripple on the surface of the third curve along the direction perpendicular to the axial direction of the outer shell is measured; n is₃Wave number of the third curve in any 0-2 pi interval along the x line α₃A phase angle at a third origin;

the surface of interior casing is close to the inner shell rear end is provided with the ripple portion, and is corresponding, and the initial point includes the fourth initial point, and the curve includes the fourth curve through the fourth initial point, the fourth curve is: y is₄＝h₄+A₄·sin(n₄x₄+α₄) (ii) a In the formula, x₄The circumferential distance between a unit point on the fourth curve and a fourth origin is set; y is₄The distance perpendicular to the circumferential direction between the unit point on the fourth curve and the fourth origin is shown; h is₄Is the average height of the fourth curve to the axis of the outer shell; a. the₄The amplitude of the corrugation on the surface of the fourth curve along the direction perpendicular to the axial direction of the outer shell is obtained; n is₄Is said fourthWave number of the curve in any 0-2 pi interval along the x line α₄Is the phase angle of the fourth origin.

4. The low drag, low noise device of claim 3 wherein said origin, said second origin, said third origin and said fourth origin are collinear.

5. The low drag, low noise apparatus of claim 3 wherein the length L of said main channel in the axial direction of said outer housing is: l is more than or equal to 1% and less than or equal to 50% of H; h is the maximum size of the rear end of the inner shell along the axial direction perpendicular to the outer shell;

the length S of the th curve in the axial direction of the outer shell₁：0≤S₁≤80％L；

The length S of the second curve in the axial direction of the outer shell₂：0≤S₂L is less than or equal to 80 percent; wherein S is₁+S₂≤L；

The length S of the third curve in the axial direction of the outer shell₃：0≤S₃≤80％L；

A length S of the fourth curve in an axial direction of the outer case₄：0≤S₄L is less than or equal to 80 percent; wherein S is₃+S₄≤L。

6. The low drag, low noise device of claim 3 wherein the distance between the inner surface of the outer housing and the outer surface of the inner housing along a plane taken perpendicular to the axial direction of the outer housing is b;

amplitude A of corrugation of the th curve in the direction perpendicular to the axial direction of the outer shell₁The relationship with b is: a. the₁＝c₁β₁×b；

The second curve has a corrugation amplitude A in the direction perpendicular to the axial direction of the outer shell₂The relationship with b is: a. the₂＝c₂β₂×b；

The third curve is perpendicular to the outer shellAxial ripple amplitude A₃The relationship with b is: a. the₃＝c₃β₃×b；

The amplitude A of the corrugation of the fourth curve in the axial direction perpendicular to the outer shell₄The relationship with b is: a. the₄＝c₄β₄×b；

In the formula, c₁、c₂、c₃And c₄Is a constant coefficient, and c is more than or equal to 0₁≤100％，0≤c₂≤100％，0≤c₃≤100％，0≤c₄≤100％；

β₁、β₂、β₃And β₄Is an incremental coefficient; wherein the content of the first and second substances,

0≤β₁less than or equal to 1, and β₁Is z₁A decreasing function of; z is a radical of₁Is the distance between the intercept plane and the front end of the housing, and z₁≤S₁；

0≤β₂Less than or equal to 1, and β₂Is z₂A decreasing function of; z is a radical of₂Is the distance between the intercept plane and the rear end of the housing, and z₂≤S₂；

0≤β₃Less than or equal to 1, and β₃Is z₃A decreasing function of; z is a radical of₃Is the distance between the cutting plane and the front end of the inner shell, and z₃≤S₃；

0≤β₄Less than or equal to 1, and β₄Is z₄A decreasing function of; z is a radical of₄Is the distance between the intercept plane and the rear end of the inner shell, and z₄≤S₄。

7. A low-drag, low-noise device according to claim 6, wherein the decreasing function β (z) is β (z) kz or

wherein z is z₁、z₂、z₃Or z₄β correspondingly is β₁、β₂、β₃Or β₄S is S₁、S₂、S₃Or S₄。

8. A low drag, low noise device according to any of claims 1-7 or wherein the low drag, low noise device is an exterior side view mirror;

the rear end of the inner shell is fixedly connected with a side-view mirror surface, airflow flows from the th outer shell opening to the second outer shell opening along the axial direction of the outer shell, tail edges formed by jet flows are formed at the downstream of the side-view mirror surface, so that vortex shedding is eliminated or weakened at the tail edges, and resistance and noise are reduced;

or the rear end of the inner shell is fixedly connected with a side-view mirror surface, the inner shell is provided with an inner shell flow pipeline penetrating through the front end of the inner shell and the rear end of the inner shell, the inner shell flow pipeline penetrates through the side-view mirror surface, airflow flows to the second outer shell opening from the th outer shell opening along the axial direction of the outer shell, and tail edges formed by jet flows are formed at the downstream of the side-view mirror surface, so that vortex shedding is eliminated or reduced at the tail edges, and resistance and noise are reduced.

9. A low-drag low-noise device according to any of claims 1-7 and , wherein the low-drag low-noise device is attached at the rear of a vehicle and/or at the rear of a vehicle nose;

the inner hull is attached to the tail or portions of the tail form at least portions of the inner hull;

the rear end of the outer shell and the rear end of the inner shell protrude out of the tail part, or the rear ends of the outer shell and the inner shell are flush with the tail part.

A motor vehicle of , comprising a low drag, low noise device of any of claims 1-9 through .

Technical Field

The invention relates to the technical field of aerodynamics, in particular to low-resistance and low-noise devices and a motor vehicle.

Background

At , the speed at which a motor vehicle travels can vary from ten miles per hour to over four hundred miles per hour.

A considerable portion of the drag applied to a motor vehicle during travel is typically the exterior side view mirror that protrudes from the vehicle cabin 1-1 and 1-2 each show the general shape of the exterior side view mirror.

In addition to drag, another product of the travel of a motor vehicle through a fluid such as air is noise, most of the noise generated during travel that is heard by the operator when operating the motor vehicle is not from the engine.

Drag and noise are a direct result of the flow conditions caused by the shape of the exterior side view mirror. For example, flow conditions such as high turbulence pressure fluctuations and vortex shedding can create drag, noise as the mobile vehicle travels through the fluid, and low floor pressure downstream of the flat rear surface of the mirror. In addition, these flow conditions can result in a condition known as underflow. An example of how vortex shedding can be caused using a common exterior side mirror can be seen in fig. 1-3, which show the side mirror traveling through air, shown as streamlines traveling around the side mirror; as shown, the flow condition is the result of the side view mirror having a streamlined front surface and abruptly ending with a flat back (e.g., mirror). These conditions can also be caused behind a flat or substantially flat surface of the motor vehicle, such as the rear end of the motor vehicle.

Therefore, the present application addresses the above-mentioned problems by providing novel low drag, low noise devices and motor vehicles to reduce noise and drag.

Disclosure of Invention

The invention aims to provide a low-resistance and low-noise device and a motor vehicle, so as to reduce noise and resistance.

Based on the above purpose, the low resistance and low noise device provided by the invention comprises an outer shell, an inner shell and a connecting piece; the outer shell and the inner shell are connected through the connecting piece;

the shell body is provided with a shell front end and a shell rear end corresponding to the shell front end along the axis direction of the shell body, wherein the shell front end is provided with an -th shell opening, and the shell rear end is provided with a second shell opening corresponding to the -th shell opening;

the inner shell is at least partially arranged inside the outer shell, and the front end of the inner shell is close to the th outer shell opening;

a main passage is formed between the inner surface of the outer shell and the outer surface of the inner shell, so that the airflow flows from the th shell opening to the second shell opening through the main passage;

at least of the inner surface of the outer housing and the outer surface of the inner housing in an axial direction perpendicular to the outer housing are provided with corrugations extending to the end faces of the surfaces.

Optionally, the curve of the corrugations arranged on at least surfaces of the inner surface of the outer shell and the outer surface of the inner shell passing through the origin is Y ═ h + A · sin (nx + α), wherein the origin is any point on the curve determined arbitrarily relative to ;

wherein x is the circumferential distance between a unit point on the curve and an origin;

y is the distance perpendicular to the circumferential direction between the unit point on the curve and the origin;

h is the average height of the curve to the axis of the outer shell;

a is the ripple amplitude of the curve on the surface perpendicular to the axial direction of the outer shell;

n is the wave number of the curve in any 0-2 pi interval along the x line;

α is the phase angle of the origin.

Alternatively,the inner surface of the outer shell is provided with a corrugated part close to the front end of the outer shell, correspondingly, the origin comprises an th origin, the curve comprises a th curve passing through the th origin, and the th curve is Y₁＝h₁+A₁·sin(n₁x₁+α₁) (ii) a In the formula, x₁Is the circumferential distance between the unit point on the th curve and the th origin point₁The distance between the unit point on the th curve and the th origin point is h₁Is the average height of the th curve to the axis of the outer shell, A₁The amplitude of the corrugation of the th curve along the plane perpendicular to the axial direction of the outer shell is n₁The wave number of the th curve in any 0-2 pi interval along the x line, α₁Phase angle at origin ;

the internal surface of shell body is close to the shell rear end is provided with the ripple portion, and is corresponding, and the initial point includes the second initial point, and the curve includes the second curve through the second initial point, the second curve is: y is₂＝h₂+A₂·sin(n₂x₂+α₂) (ii) a In the formula, x₂The circumferential distance between the unit point on the second curve and the second origin is set; y is₂The distance perpendicular to the circumferential direction between the unit point on the second curve and the second origin is shown; h is₂Is the average height of the second curve to the axis of the outer shell; a. the₂The amplitude of the corrugation on the surface of the second curve along the direction perpendicular to the axial direction of the outer shell is obtained; n is₂Wave number of the second curve in any 0-2 pi interval along the x line α₂A phase angle that is a second origin;

the surface of interior casing is close to the inner shell front end is provided with the ripple portion, and is corresponding, and the initial point includes the third initial point, and the curve includes the third curve through the third initial point, the third curve is: y is₃＝h₃+A₃·sin(n₃x₃+α₃) (ii) a In the formula, x₃The circumferential distance between a unit point on the third curve and a third origin is set; y is₃Is the perpendicular of the unit point on the third curve and the third originA circumferential distance; h is₃Is the average height of the third curve to the axis of the outer shell; a. the₃The amplitude of the ripple on the surface of the third curve along the direction perpendicular to the axial direction of the outer shell is measured; n is₃Wave number of the third curve in any 0-2 pi interval along the x line α₃A phase angle at a third origin;

the surface of interior casing is close to the inner shell rear end is provided with the ripple portion, and is corresponding, and the initial point includes the fourth initial point, and the curve includes the fourth curve through the fourth initial point, the fourth curve is: y is₄＝h₄+A₄·sin(n₄x₄+α₄) (ii) a In the formula, x₄The circumferential distance between a unit point on the fourth curve and a fourth origin is set; y is₄The distance perpendicular to the circumferential direction between the unit point on the fourth curve and the fourth origin is shown; h is₄Is the average height of the fourth curve to the axis of the outer shell; a. the₄The amplitude of the corrugation on the surface of the fourth curve along the direction perpendicular to the axial direction of the outer shell is obtained; n is₄Wave number of the fourth curve in any 0-2 pi interval along the x line α₄Is the phase angle of the fourth origin.

Optionally, the origin, the second origin, the third origin, and the fourth origin are collinear.

Optionally, in the axial direction of the outer housing, the length L of the main channel: l is more than or equal to 1% and less than or equal to 50% of H; h is the maximum size of the rear end of the inner shell along the axial direction perpendicular to the outer shell;

the length S of the th curve in the axial direction of the outer shell₁：0≤S₁≤80％L；

The length S of the second curve in the axial direction of the outer shell₂：0≤S₂L is less than or equal to 80 percent; wherein S is₁+S₂≤L；

The length S of the third curve in the axial direction of the outer shell₃：0≤S₃≤80％L；

A length S of the fourth curve in an axial direction of the outer case₄：0≤S₄L is less than or equal to 80 percent; wherein S is₃+S₄≤L。

Optionally, the distance between the inner surface of the outer shell and the outer surface of the inner shell along a section plane perpendicular to the axial direction of the outer shell is b;

amplitude A of corrugation of the th curve in the direction perpendicular to the axial direction of the outer shell₁The relationship with b is: a. the₁＝c₁β₁×b；

The second curve has a corrugation amplitude A in the direction perpendicular to the axial direction of the outer shell₂The relationship with b is: a. the₂＝c₂β₂×b；

The amplitude A of the corrugation of the third curve in the axial direction perpendicular to the outer shell₃The relationship with b is: a. the₃＝c₃β₃×b；

The amplitude A of the corrugation of the fourth curve in the axial direction perpendicular to the outer shell₄The relationship with b is: a. the₄＝c₄β₄×b；

In the formula, c₁、c₂、c₃And c₄Is a constant coefficient, and c is more than or equal to 0₁≤100％，0≤c₂≤100％，0≤c₃≤100％，0≤c₄≤100％；

β₁、β₂、β₃And β₄Is an incremental coefficient; wherein the content of the first and second substances,

0≤β₁less than or equal to 1, and β₁Is z₁A decreasing function of; z is a radical of₁Is the distance between the intercept plane and the front end of the housing, and z₁≤S₁；

0≤β₂Less than or equal to 1, and β₂Is z₂A decreasing function of; z is a radical of₂Is the distance between the intercept plane and the rear end of the housing, and z₂≤S₂；

0≤β₃Less than or equal to 1, and β₃Is z₃A decreasing function of; z is a radical of₃Is the distance between the cutting plane and the front end of the inner shell, and z₃≤S₃；

0≤β₄Less than or equal to 1, and β₄Is z₄A decreasing function of; z is a radical of₄Is the distance between the intercept plane and the rear end of the inner shell, and z₄≤S₄。

Optionally, the decreasing function β (z): β (z) ═ kz or

In the formula, k is a coefficient, and k is more than or equal to 0;

wherein z is z₁、z₂、z₃Or z₄β correspondingly is β₁、β₂、β₃Or β₄S is S₁、S₂、S₃Or S₄。

Optionally, the low resistance, low noise device is an exterior side view mirror;

the rear end of the inner shell is fixedly connected with a side-view mirror surface, airflow flows from the th outer shell opening to the second outer shell opening along the axial direction of the outer shell, tail edges formed by jet flows are formed at the downstream of the side-view mirror surface, so that vortex shedding is eliminated or weakened at the tail edges, and resistance and noise are reduced;

or the rear end of the inner shell is fixedly connected with a side-view mirror surface, the inner shell is provided with an inner shell flow pipeline penetrating through the front end of the inner shell and the rear end of the inner shell, the inner shell flow pipeline penetrates through the side-view mirror surface, airflow flows to the second outer shell opening from the th outer shell opening along the axial direction of the outer shell, and tail edges formed by jet flows are formed at the downstream of the side-view mirror surface, so that vortex shedding is eliminated or reduced at the tail edges, and resistance and noise are reduced.

Optionally, the low drag, low noise device is attached at the tail of the vehicle and/or at the tail of the nose of the vehicle;

the inner hull is attached to the tail or portions of the tail form at least portions of the inner hull;

the rear end of the outer shell and the rear end of the inner shell protrude out of the tail part, or the rear ends of the outer shell and the inner shell are flush with the tail part.

In view of the above object, the present invention provides a motor vehicle comprising the low-drag low-noise apparatus.

The invention provides a low-resistance low-noise device and a motor vehicle, wherein a main channel is formed between the inner surface of an outer shell and the outer surface of an inner shell, the cross-sectional area of the main channel close to the front end of the outer shell along the axial direction of the outer shell is not less than that of the main channel close to the rear end of the outer shell, so that the main channel is gradually reduced from a outer shell opening to a second outer shell opening, contraction channels or similar contraction channels are formed, airflow can be accelerated through the channel, tail edges formed by jet flows are formed at the downstream of the rear end of the inner shell, the stable virtual tail edges can prevent or weaken vortex shedding and improve the downstream pressure at the rear end of the inner shell so as to reduce noise and reduce resistance, at least surfaces of the inner surface of the outer shell and the outer surface of the inner shell are provided with corrugated parts extending to the end surfaces of the outer shell, the main channel is optimized by , and the main channel is optimized by so that the downstream pressure at the.

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, and it is obvious that the drawings in the following description are embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

1-1 is a top view of a portion of a prior art motor vehicle with an attached exterior side view mirror;

1-2 are side views of a portion of a prior art motor vehicle with an attached exterior side view mirror;

1-3 are side views of a prior art automotive vehicle exterior side view mirror subjected to a flow field, illustrating streamlines of the flow field, showing how the automotive vehicle exterior side view mirror causes vortex shedding;

FIG. 2-1 is a front perspective view of a low drag, low noise apparatus provided by an embodiment of the present invention;

FIG. 2-2 is a front view of the low drag, low noise apparatus shown in FIG. 2-1;

2-3 are side views of the low drag, low noise apparatus shown in FIG. 2-1;

2-4 are rear views of the low drag, low noise apparatus shown in FIG. 2-1;

2-5 are wire frame front perspective views of the low drag, low noise apparatus shown in FIG. 2-1;

2-6 are cross-sectional views A-A of the low drag, low noise apparatus shown in FIGS. 2-2;

FIGS. 2-7 are schematic illustrations of the low drag, low noise apparatus of FIGS. 2-6 subjected to a flow field;

2-8 are cross-sectional views B-B of the low drag low noise apparatus shown in FIG. 2-2;

FIG. 3-1 is a front perspective view of another low drag, low noise device provided by an embodiment of the present invention;

FIG. 3-2 is a front view of the low drag, low noise apparatus shown in FIG. 3-1;

FIG. 3-3 is a rear view of the low drag, low noise apparatus shown in FIG. 3-1;

FIG. 3-4 is a wireframe front perspective view of the low drag, low noise apparatus shown in FIG. 3-1;

FIG. 4-1 is a front perspective view of another low drag, low noise device provided by an embodiment of the present invention;

FIG. 4-2 is a cross-sectional view in the width direction of the low drag low noise apparatus shown in FIG. 4-1;

FIG. 5-1 is a perspective view of a motor vehicle with a low drag, low noise device attached provided by an embodiment of the present invention;

FIG. 5-2 is a partial cross-sectional view of the low drag, low noise apparatus of FIG. 5-1 taken along the length of the motor vehicle;

FIG. 5-2 is a partial cross-sectional view of the low drag, low noise apparatus of FIG. 5-1 taken along the length of the motor vehicle;

FIG. 5-3 is a modified view of the partial cross-sectional view shown in FIG. 5-2;

fig. 5-4 is another variation of the partial cross-sectional view shown in fig. 5-2;

FIG. 6-1 is a perspective view of another motor vehicle having a low drag, low noise device attached thereto, provided by an embodiment of the present invention;

fig. 6-2 is a perspective view of another motor vehicle having a low drag, low noise device attached thereto, provided by an embodiment of the present invention.

The figure shows 100-low resistance low noise device, 110-outer shell, 111-outer shell front end, 112-outer shell rear end, 113- th outer shell opening, 114-second outer shell opening, 120-inner shell, 121-inner shell front end, 122-inner shell rear end, 130-connecting piece, 140-main channel, 150-inner shell flow channel.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are partial embodiments, but not all embodiments .

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are used to mean, for example, either fixedly or removably connected or physically connected, mechanically or electrically connected, directly or indirectly connected through an intermediary, or communicating between two elements.