阅读说明：本技术 用于发动机的导风结构及车体 (Air guide structure for engine and vehicle body ) 是由 林健明 赵向阳 高宏亮 胡浍泳 于 2021-09-30 设计创作，主要内容包括：本发明公开了一种用于发动机的导风结构及车体,用于发动机的导风结构包括护罩和导风板,护罩固定设置并设有第一窗口,第一窗口与散热器对应设置；导风板固定设置并与护罩间隔设置,导风板设有与第一窗口对应的第二窗口,第二窗口的上部低于第一窗口的上部,第二窗口的下部高于第一窗口的下部。护罩的第一窗口与散热器对应,而导风板的第二窗口能够使空气进入并到达第一窗口,以将散热器上的热量带走；由于第二窗口的上部低于第一窗口的上部,而第二窗口的下部高于第一窗口的下部,从而使经过第二窗口的空气几乎能够全部或大部分进入第一窗口并进一步到达散热器,从而大大提高了导入散热器的空气量,提高了对散热器的散热冷却效果。(The invention discloses an air guide structure for an engine and a vehicle body, wherein the air guide structure for the engine comprises a protective cover and an air guide plate, the protective cover is fixedly arranged and provided with a first window, and the first window is arranged corresponding to a radiator; the air deflector is fixedly arranged and is arranged at intervals with the protective cover, the air deflector is provided with a second window corresponding to the first window, the upper part of the second window is lower than the upper part of the first window, and the lower part of the second window is higher than the lower part of the first window. The first window of the shield corresponds to the radiator, and the second window of the air deflector can enable air to enter and reach the first window so as to take away heat on the radiator; because the upper part of the second window is lower than the upper part of the first window, and the lower part of the second window is higher than the lower part of the first window, the air passing through the second window can almost completely or mostly enter the first window and further reach the radiator, thereby greatly improving the air quantity led into the radiator and improving the heat dissipation and cooling effects of the radiator.)

1. A wind-guiding structure for an engine, comprising:

the protective cover is fixedly arranged and provided with a first window, and the first window is arranged corresponding to the radiator;

the air deflector is fixedly arranged and arranged at intervals with the protective cover, a second window corresponding to the first window is arranged on the air deflector, the upper portion of the second window is lower than the upper portion of the first window, and the lower portion of the second window is higher than the lower portion of the first window.

2. The air guide structure for an engine according to claim 1, wherein the air guide plate is provided with a first edge portion and a second edge portion, the first edge portion and the second edge portion are both provided so as to extend toward one side of the shroud and form a guide passage, and the guide passage extends to the second window.

3. The air guide structure for an engine according to claim 2, wherein one end of the first edge portion extends to an upper portion of the second window, one end of the second edge portion extends to a lower portion of the second window, and a distance between the first edge portion and the second edge portion is gradually increased in a direction toward the shroud.

4. The air guide structure for an engine according to claim 2, wherein the air deflector is provided with an inward recess between the first edge portion and the second edge portion, the inward recess extending toward one side of the shroud and extending to the second window, and the inward recess forms a side wall of the air guide channel.

5. The air guide structure for an engine according to claim 2, wherein the shroud is provided with a third edge portion and a fourth edge portion, both of which are provided along an edge of the first window, the third edge portion being located at an upper portion of the first window, the fourth edge portion being located at a lower portion of the first window; the third edge portion is located above the first edge portion, and the fourth edge portion is located below the second edge portion.

6. The air guide structure for an engine according to claim 5, wherein the third edge portion has a front edge portion located on a side of the third edge portion facing the air guide plate; the front edge part extends towards the upper part in a direction away from the air deflector.

7. The air guide structure for an engine according to claim 6, wherein the fourth edge portion has a rear edge portion located on a side of the fourth edge portion away from the air guide plate; the rear edge part extends towards the upper part in an inclined way in the direction away from the air deflector.

8. The air guide structure for an engine according to claim 6, wherein the first edge portion and the second edge portion are located forward of the front edge portion.

9. The air guide structure for the engine according to any one of claims 1 to 8, wherein the shroud is provided with air guide strips, and the air guide strips are provided with at least two air guide strips and are arranged in the first window at intervals;

the one end that the orientation of wind-guiding strip the radiator all is in the coplanar and forms first plane, first plane with the cooling surface interval parallel arrangement of radiator.

10. A vehicle body characterized by comprising the air guide structure for an engine according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of engine devices, in particular to an air guide structure for an engine and a vehicle body.

Background

Engines are generally classified into air-cooled engines and water-cooled engines according to the cooling medium. The air-cooled engine is an engine using air as a cooling medium, and a fan causes the air to flow across the surface of the heat radiating fins at a high speed to take away heat emitted by the engine, so that the engine is cooled. Unlike an air-cooled engine, a water-cooled engine refers to an engine using water as a cooling medium, a water pump flows water through the engine and a radiator, and a vehicle body (such as a motorcycle, an automobile, and the like) cools the engine by using a windward airflow or a fan to cool the water flowing through the radiator during driving.

For a water-cooled engine, the heat is taken away by water, and the heat of the water is taken away by air flow flowing through the radiator, so that the cooling effect of the air flow on the radiator is directly related to the cooling effect of the whole engine. However, the traditional air guiding structure has an unsatisfactory air guiding effect, cannot allow enough air flow to enter the radiator, and is difficult to meet the cooling requirement of the radiator in the working process of the engine.

Disclosure of Invention

Accordingly, it is necessary to provide an air guide structure for an engine and a vehicle body; the air guide structure for the engine can guide more air flow into the radiator so as to ensure the air quantity reaching the radiator and improve the radiating effect; this automobile body adopts aforementioned a wind-guiding structure for the engine, and the radiating effect is better, guarantees the performance of engine.

The technical scheme is as follows:

an embodiment provides a wind guide structure for an engine, including:

the protective cover is fixedly arranged and provided with a first window, and the first window is arranged corresponding to the radiator;

the air deflector is fixedly arranged and arranged at intervals with the protective cover, a second window corresponding to the first window is arranged on the air deflector, the upper portion of the second window is lower than the upper portion of the first window, and the lower portion of the second window is higher than the lower portion of the first window.

In the air guide structure for the engine, the first window of the protective cover corresponds to the radiator, and the second window of the air guide plate can enable air to enter and reach the first window so as to take away heat on the radiator; because the upper part of the second window is lower than the upper part of the first window, and the lower part of the second window is higher than the lower part of the first window, the air passing through the second window can almost completely or mostly enter the first window and further reach the radiator, thereby greatly improving the air quantity led into the radiator and improving the heat dissipation and cooling effects of the radiator.

The technical solution is further explained below:

in one embodiment, the air deflector is provided with a first edge portion and a second edge portion, the first edge portion and the second edge portion extend towards one side of the shield and form a flow guide channel, and the flow guide channel extends to the second window.

In one embodiment, an end of the first edge extends to an upper portion of the second window, an end of the second edge extends to a lower portion of the second window, and a distance between the first edge and the second edge increases in a direction toward the shield.

In one embodiment, the air deflector is provided with an inner concave portion, the inner concave portion is located between the first edge portion and the second edge portion, the inner concave portion extends towards one side of the shield and extends to the second window, and the inner concave portion forms a side wall of the flow guide channel.

In one embodiment, the shield is provided with a third edge portion and a fourth edge portion, both of which are disposed along an edge of the first window, the third edge portion being located at an upper portion of the first window, the fourth edge portion being located at a lower portion of the first window; the third edge portion is located above the first edge portion, and the fourth edge portion is located below the second edge portion.

In one embodiment, the third edge portion has a front edge portion located on a side of the third edge portion facing the air deflection panel; the front edge part extends towards the upper part in a direction away from the air deflector.

In one embodiment, the fourth edge portion has a rear edge portion located on a side of the fourth edge portion away from the air deflection plate; the rear edge part extends towards the upper part in an inclined way in the direction away from the air deflector.

In one embodiment, the first edge portion and the second edge portion are both located forward of the front edge portion.

In one embodiment, the protective cover is provided with at least two air guide strips which are arranged in the first window at intervals;

the one end that the orientation of wind-guiding strip the radiator all is in the coplanar and forms first plane, first plane with the cooling surface interval parallel arrangement of radiator.

Another embodiment provides a vehicle body including the air guide structure for an engine according to any one of the above aspects.

Above-mentioned automobile body adopts aforementioned any one technical scheme a wind-guiding structure for engine for the wind-guiding effect is better, and the air quantity that gets into the radiator is more, and then makes the radiating effect to the radiator better, thereby has guaranteed the performance of engine.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Furthermore, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements in the drawings are drawn only by way of example, and not necessarily to true scale.

Fig. 1 is a schematic view of an air guide structure for an engine according to an embodiment of the present invention;

FIG. 2 is a schematic top view of the embodiment of FIG. 1 with the air deflector removed;

FIG. 3 is a sectional view of the shield and heat sink assembly of the embodiment of FIG. 1;

fig. 4 is a schematic structural view of the air deflector in the embodiment of fig. 1.

Reference is made to the accompanying drawings in which:

100. a shield; 110. a first window; 120. wind guide strips; 130. a third edge portion; 131. a front edge portion; 140. a fourth edge portion; 141. a rear edge portion; 200. an air deflector; 210. a second window; 220. a first edge portion; 230. a second edge portion; 240. an inner concave portion; 250. a flow guide channel; 300. a heat sink; 400. and (4) a box body.

Detailed Description

Embodiments of the present invention are described in detail below with reference to the accompanying drawings:

in order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

A case 400 of the water-cooled engine, such as a crankcase or a box casing, is provided with a fan assembly and a radiator 300, and water flows through the radiator 300 under the driving of a water pump so as to take away heat on the engine; meanwhile, the fan assembly generates air flow and takes away heat on the radiator 300, and water circulates continuously, so that heat generated in the working process of the engine is taken away continuously, and the heat dissipation and cooling of the engine are realized.

Referring to fig. 1, an embodiment provides an air guiding structure for an engine, including a shroud 100 and an air guiding plate 200, wherein:

as shown in fig. 1 and 2, the cover 100 is fixedly disposed and provided with a first window 110, and the first window 110 is disposed corresponding to the heat sink 300.

The first window 110 is opened on the cover 100, and is used for guiding air to the heat sink 300, so as to dissipate heat of the flat tubes or fins of the heat sink 300 and take away heat of the heat sink 300.

Optionally, the shroud 100 is secured to the heat sink 300. Of course, the shroud 100 may also be secured to a fan assembly, such as a fan assembly including a fan housing and a fan wheel that rotates within the fan housing and draws air at the first windows 110 onto the heat sink 300. Thus, the shroud 100 and the fan wheel are located on opposite sides of the heat sink 300. In this case, the shroud 100 is fixed to a fan cover of the fan assembly.

In the embodiment shown in fig. 1, the air deflector 200 is fixedly disposed and spaced apart from the shroud 100, the air deflector 200 is provided with a second window 210 corresponding to the first window 110, an upper portion of the second window 210 is lower than an upper portion of the first window 110, and a lower portion of the second window 210 is higher than a lower portion of the first window 110.

It should be noted that:

the upper and lower parts here are to be understood as upper and lower parts in the vertical direction. After the engine is installed, the air flows in a horizontal direction during the running of the vehicle body in most of the air flow. Since the upper portion of the second window 210 is lower than the upper portion of the first window 110 and the lower portion of the second window 210 is higher than the lower portion of the first window 110, the air flowing in the horizontal direction can enter the first window 110 and further reach the heat sink 300 in whole or in large part, so that the effect of taking away the heat on the heat sink 300 by the large amount of air flow is achieved.

In the air guide structure for the engine, the first window 110 of the shroud 100 corresponds to the radiator 300, and the second window 210 of the air guide plate 200 enables air to enter and reach the first window 110 to take heat away from the radiator 300; since the upper portion of the second window 210 is lower than the upper portion of the first window 110, and the lower portion of the second window 210 is higher than the lower portion of the first window 110, the air passing through the second window 210 can almost entirely or mostly enter the first window 110 and further reach the heat sink 300, so that the amount of air introduced into the heat sink 300 is greatly increased, and the heat dissipation and cooling effects on the heat sink 300 are improved.

In one embodiment, referring to fig. 1 and 4, the wind deflector 200 is provided with a first edge portion 220 and a second edge portion 230, the first edge portion 220 and the second edge portion 230 are both extended toward one side of the shroud 100 and form a wind guide channel 250, and the wind guide channel 250 is extended to the second window 210.

In the embodiment shown in fig. 1 and 4, a first edge 220 and a second edge 230 are disposed on the right side of the first window 110, the first edge 220 and the second edge 230 both extend toward the left side of the shroud 100, that is, the first edge 220 and the second edge 230 both extend in a substantially horizontal direction, the first edge 220 and the second edge 230 are spaced up and down to form a diversion channel 250, air flows through the diversion channel 250 during driving, and the end of the diversion channel 250 is located at the second window 210, so that the air is guided into the second window 210 and further reaches the radiator 300 through the first window 110.

As shown in fig. 1 and 4, the first edge portion 220 and the second edge portion 230 are substantially provided as a flange strip, and a region between the first edge portion 220 and the second edge portion 230 substantially forms an air channel, i.e., a diversion passage 250.

In one embodiment, referring to fig. 1 and 4, one end of the first edge portion 220 extends to an upper portion of the second window 210, one end of the second edge portion 230 extends to a lower portion of the second window 210, and a distance between the first edge portion 220 and the second edge portion 230 is gradually increased in a direction toward the shield 100.

In the embodiment shown in fig. 1 and 4, the left end of the first edge portion 220 extends to the upper portion of the second window 210, the left end of the second edge portion 230 extends to the lower portion of the second window 210, and it can be seen that the distance between the first edge portion 220 and the second edge portion 230 is gradually increased in the right-to-left direction, that is: the flow guide channel 250 is arranged to be gradually enlarged in a direction toward the second window 210 until reaching the second window 210, so that more air can be introduced into the first window 110 through the second window 210.

In one embodiment, referring to fig. 1 and 4, the air deflector 200 is provided with an inner recess 240, the inner recess 240 is located between the first edge 220 and the second edge 230, the inner recess 240 extends toward one side of the shroud 100 and extends to the second window 210, and the inner recess 240 forms a sidewall of the flow guide channel 250.

In the embodiment shown in fig. 1 and 4, an inner recess 240 is disposed between the first edge 220 and the second edge 230, the inner recess 240 is recessed toward the inner side of the wind deflector 200 to form a groove toward the direction of the shroud 100, the groove extends to the second window 210, and the inner recess 240 forms a sidewall of the flow guide channel 250, along which air flows toward the position of the second window 210.

In one embodiment, referring to fig. 1 and 2, the protective cover 100 has a third edge 130 and a fourth edge 140, the third edge 130 and the fourth edge 140 are both disposed along the edge of the first window 110, the third edge 130 is located at the upper portion of the first window 110, and the fourth edge 140 is located at the lower portion of the first window 110; the third edge 130 is located above the first edge 220, and the fourth edge 140 is located below the second edge 230.

In the embodiment shown in fig. 1 and 2, the first window 110 is substantially rectangular and is opened at the middle of the cover 100, and the left, upper and lower edges of the first window 110 are provided with edge strips, and the right edge is not provided with edge strips in consideration of the corresponding air deflection plates 200. The upper edge strip is the third edge 130, and the lower edge strip is the fourth edge 140.

In the embodiment shown in fig. 1, the first edge portion 220 is substantially below the third edge portion 130, and the second edge portion 230 is substantially above the fourth edge portion 140. With this arrangement, the air guided to the shield 100 through the second window 210 is further guided into the first window 110 by the third edge 130 and the fourth edge 140 as much as possible, thereby preventing the air from flowing into the peripheral region and increasing the amount of air to be introduced.

Alternatively, the first edge portion 220, the second edge portion 230, the third edge portion 130 and the fourth edge portion 140 extend substantially horizontally, and the horizontal extending directions of the first edge portion 220, the second edge portion 230, the third edge portion 130 and the fourth edge portion 140 are substantially parallel. With such an arrangement, the horizontal extension line of the first edge 220 and the second edge 230 is substantially between the horizontal extension lines of the third edge 130 and the fourth edge 140, so that the airflow is guided to the heat sink 300 in a parallel movement manner, and compared with a flow guiding manner with a plurality of curved paths, the amount of air introduced is larger, thereby improving the heat dissipation effect of the heat sink 300.

In one embodiment, referring to fig. 1 and 2, the third edge portion 130 has a front edge portion 131, and the front edge portion 131 is located on a side of the third edge portion 130 facing the wind deflector 200; the front edge 131 extends obliquely upward in a direction away from the air guide plate 200.

In the embodiment shown in fig. 2, the right side of the third edge portion 130 has a front edge portion 131, and the right side of the front edge portion 131 extends obliquely toward the lower side, but the right side of the front edge portion 131 is higher than the first edge portion 220. With the arrangement, when the airflow entering the second window 210 through the flow guide channel 250 further enters the first window 110, the airflow can be prevented from overflowing outwards by the blocking of the front edge part 131, so that the effect that almost all the airflow enters the first window 110 is achieved, and the air guide amount is increased.

In the embodiment shown in fig. 2, the third edge 130 extends horizontally as a whole, and the front edge 131 of the third edge 130 facing the air deflector 200 extends obliquely downward.

In one embodiment, referring to fig. 1 and fig. 2, the fourth edge 140 has a rear edge 141, and the rear edge 141 is located on a side of the fourth edge 140 away from the wind deflector 200; the rear edge 141 extends obliquely upward in a direction away from the air guide plate 200.

In the embodiment shown in fig. 2, the left side of the fourth edge portion 140 has a rear edge portion 141, and the rear edge portion 141 extends obliquely upward and rearward, that is: the rear edge portion 141 extends obliquely forward and downward, and extends obliquely downward toward the air deflector 200. With this arrangement, when air enters the first window 110 through the second window 210 via the diversion channel 250, the rear edge portion 141 can further divert the air flow that may reach the outside of the first window 110 into the first window 110, so as to increase the intake air amount, ensure that a large amount of air can reach the heat sink 300, and perform the heat dissipation and cooling function on the heat sink 300.

In one embodiment, referring to fig. 1, the first edge portion 220 and the second edge portion 230 are both located in front of the front edge portion 131.

In the embodiment shown in fig. 1, the rear portion of the first edge portion 220 and the rear portion of the second edge portion 230 are both to the right of the front edge portion 131. With such an arrangement, on one hand, a certain distance is provided between the wind deflector 200 and the shroud 100, and on the other hand, air in the driving process directly reaches the area of the first window 110 after flowing through the second window 210, so that the air flowing through the second window 210 is prevented from being lost.

It should be noted that:

the front and rear herein refer to the front and rear in the traveling direction, such as when the engine is mounted on a motorcycle, the front in the traveling direction of which is the front and the rear is the rear. Therefore, the air deflector 200 is forward and the shroud 100 is rearward, and both the first edge portion 220 and the second edge portion 230 are forward of the front edge portion 131 when viewed from a side view. During the running process of the motorcycle, the air flows backwards relative to the motorcycle, enters the second window 210 along the diversion channel 250 on the air deflector 200 and further enters the first window 110, and finally reaches the radiator 300 through the first window 110 to take away the heat on the radiator 300.

In one embodiment, referring to fig. 1 to 3, the cover 100 is provided with at least two wind guide strips 120, and the wind guide strips 120 are disposed in the first window 110 at intervals.

As shown in fig. 2, in the embodiment, a first window 110 is formed in the middle of the shroud 100, a plurality of wind guide strips 120 are disposed in the first window 110, the plurality of wind guide strips 120 are disposed in parallel at intervals, and a wind guide gap is formed between adjacent wind guide strips 120.

It should be noted that:

as shown in fig. 2, the first window 110 is opened at substantially the middle of the shroud 100, so that the arrow indicating the first window 110 is difficult due to the presence of the wind guide strips 120 and the heat sink 300. It should be understood that, in fig. 2, although the arrow indicating the first window 110 only indicates between two wind guide strips 120, it should be understood that all the empty window regions where the wind guide strips 120 are located are the first window 110, and it is due to the existence of the first window 110 that the plurality of wind guide strips 120 are arranged on the first window 110, and details are not repeated here.

In one embodiment, the plate surface of the wind guide strip 120 is perpendicular to the flow direction of the air.

When the plate surface of the air guide strip 120 is specifically arranged, the air guide strip 120 arranged is used to guide air, and the air flow is guided in a relatively vertical direction.

In one embodiment, referring to fig. 3, ends of the wind guide strips 120 facing the heat sink 300 are all located on the same plane and form a first plane, and the first plane is parallel to the heat dissipation surface of the heat sink 300 at an interval.

In the embodiment shown in fig. 3, the ends of all the wind-guiding strips 120 facing the heat sink 300 are substantially in the same plane, and the plane is substantially parallel to and spaced from the heat sink 300 of the heat sink 300. With such an arrangement, the air volume entering different areas of the heat sink 300 after passing through the first window 110 is substantially equivalent, and the distribution is more uniform, so that more uniform heat dissipation is achieved.

In the embodiment shown in fig. 3, in order to ensure that the ends of the air guide strips 120 facing the heat sink 300 are all in the same plane, the sizes of the air guide strips 120 are different.

Another embodiment provides a vehicle body including the air guide structure for an engine as described in any one of the above embodiments.

This automobile body adopts aforementioned any one technical scheme a wind-guiding structure for engine for wind-guiding effect is better, and the air quantity that gets into radiator 300 is more, and then makes the radiating effect to radiator 300 better, thereby has guaranteed the performance of engine.

Alternatively, the vehicle body may be a motorcycle, and may be a scooter type motorcycle, and the engine used is a water-cooled engine, so as to ensure the intake air by the action of the shield 100 and the air deflector 200, thereby improving the heat dissipation and cooling effect on the engine.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are 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 the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.