阅读说明：本技术 一种液冷母排 (Liquid cooling busbar ) 是由 龚胜伟 江才 刘晓晖 于 2021-06-28 设计创作，主要内容包括：本发明涉及母排散热技术领域,公开了一种液冷母排,该液冷母排包括至少两个母排本体,相邻两个母排本体间隔设置,相邻两个母排本体能够形成密封的冷却腔,冷却腔中容纳有冷却介质。该液冷母排中母排本体和冷却介质能直接接触,且换热面积大,冷却效果好,即便在相邻两个母排本体间距较小或母排本体长度较长的情况下,也能保证母排本体的冷却效果,能够提高母排本体的载流密度,从而减小母排本体的横截面积,降低母排本体的制造成本。(The invention relates to the technical field of busbar heat dissipation, and discloses a liquid-cooled busbar which comprises at least two busbar bodies, wherein two adjacent busbar bodies are arranged at intervals, a sealed cooling cavity can be formed by the two adjacent busbar bodies, and a cooling medium is contained in the cooling cavity. The liquid cooling busbar is provided with the busbar body and the cooling medium which can be in direct contact, the heat exchange area is large, the cooling effect is good, even if the distance between every two adjacent busbar bodies is small or the length of the busbar body is long, the cooling effect of the busbar body can be guaranteed, the current-carrying density of the busbar body can be improved, the cross section area of the busbar body is reduced, and the manufacturing cost of the busbar body is reduced.)

1. The utility model provides a liquid cooling female arranging, its characterized in that, liquid cooling female arranging includes that at least two are female arranges body (1), adjacent two female arranging body (1) interval sets up, adjacent two female arranging body (1) can form sealed cooling chamber (2), the coolant has been held in cooling chamber (2).

2. The liquid-cooled busbar according to claim 1, comprising at least one sealing frame (3), wherein the sealing frame (3) is disposed between two adjacent busbar bodies (1), and the sealing frame (3) and the two adjacent busbar bodies (1) can enclose to form the cooling cavity (2).

3. The liquid-cooled busbar according to claim 2, wherein a first sealing groove (31) is formed in each of two end faces of the sealing frame body (3), a first sealing gasket is filled in each first sealing groove (31), and the first sealing gaskets can be respectively abutted against the first sealing groove (31) and the corresponding busbar body (1).

4. A liquid-cooled busbar according to claim 2, wherein said sealing frame (3) is provided with at least one inlet and at least one outlet, each of said inlet and said outlet being in communication with said cooling chamber (2).

5. The liquid-cooled busbar according to claim 2, wherein the number of the sealing frame bodies (3) between two adjacent busbar bodies (1) is at least two, each sealing frame body (3) and two adjacent busbar bodies (1) enclose to form the cooling cavity (2), at least two sealing frame bodies (3) are arranged at intervals along the length direction of the busbar bodies (1), a connecting groove (6) is formed between two adjacent sealing frame bodies (3), and the connecting groove (6) is used for accommodating a connecting bar (200) of a device to be connected.

6. A liquid-cooled busbar according to claim 5, further comprising an intermediate member (5) corresponding to the connecting groove (6), wherein the intermediate member (5) is disposed at one end of the connecting groove (6) far away from the connecting bar (200), and the intermediate member (5) is respectively communicated with two adjacent cooling chambers (2).

7. A liquid-cooled busbar according to claim 2, wherein the sealing frame (3) is made of an insulating material, and the cooling medium is an insulating liquid.

8. A liquid-cooled busbar according to claim 2, wherein the side of the busbar body (1) for forming the cooling chamber (2) is insulated.

9. A liquid-cooled busbar according to claim 1, wherein the liquid-cooled busbar comprises a pressing assembly (4), the pressing assembly (4) comprises a connecting piece (41) and two pressing plates (42), the two pressing plates (42) are arranged at intervals, all busbar bodies (1) are arranged between the two pressing plates (42), and the connecting piece (41) can penetrate through a first pressing plate (42) and is fixed on a second pressing plate (42).

10. The liquid-cooled busbar according to claim 9, wherein the number of the pressing assemblies (4) is multiple, and the pressing assemblies (4) are arranged at intervals along the length direction of the busbar body (1).

11. A liquid-cooled busbar according to any one of claims 1 to 10, wherein the lateral surface of the busbar body (1) for forming the cooling chamber (2) is provided with a plurality of turbulence protrusions (11) arranged at intervals.

12. A liquid-cooled busbar according to any one of claims 1 to 10, further comprising two end plates, wherein all busbar bodies (1) are located between the two end plates, a groove is formed in one side of each end plate close to the busbar body (1), the groove can surround the side of the adjacent busbar body (1) to form a sealed cavity, and the sealed cavity contains the cooling medium.

Technical Field

The invention relates to the technical field of busbar heat dissipation, in particular to a liquid-cooled busbar.

Background

With the continuous development of the technology, the power of the power electronic conversion equipment is higher and higher, and the current-carrying capacity of a busbar for connecting each electrical device and electrical equipment is also higher and higher. In consideration of heat dissipation, the busbar is often required to select a lower current-carrying density during design, and in order to meet the requirement of large current, the cross-sectional area of the busbar is often large, a large number of metal conductors are required, and the cost is high.

In the prior art, the bus bar is usually cooled by air cooling or liquid cooling to improve the current-carrying density of the bus bar, thereby reducing the manufacturing cost of the bus bar. However, when the multilayer busbars are arranged in parallel and have small intervals, the existing air-cooling heat dissipation mode is difficult to dissipate the heat of the part between two adjacent busbars, and the heat dissipation effect is worse along with the increase of the length of the busbars; the existing liquid cooling heat dissipation mainly adopts a mode of drilling a cooling hole on a busbar and then introducing a cooling medium into the cooling hole to dissipate heat of the busbar, the diameter of the cooling hole is limited by the sectional area of the busbar, the actual contact area of the cooling medium and the busbar is small, and the heat dissipation effect is poor.

Disclosure of Invention

The invention aims to provide a liquid-cooled busbar which has a good heat dissipation effect and can improve the current-carrying density of a busbar body and reduce the manufacturing cost of the busbar body.

Therefore, the invention adopts the following technical scheme:

the utility model provides a liquid cooling female arranging, female arranging of liquid cooling includes two at least female bodies of arranging, adjacent two female body interval setting of arranging, adjacent two female body of arranging can form sealed cooling chamber, the cooling medium has been held in the cooling chamber.

As a liquid cooling female preferred scheme of arranging, the female row of liquid cooling includes at least one sealed frame, adjacent two all be equipped with between the female body sealed frame, sealed frame and adjacent two female body of arranging can enclose and establish and form the cooling chamber.

As a female preferred scheme who arranges of liquid cooling, two terminal surfaces of sealing frame all are equipped with first seal groove, it has first sealed the pad to fill in the first seal groove, first sealed pad can respectively with first seal groove with correspond female body looks butt of arranging.

As a preferred scheme of the liquid-cooled busbar, at least one inlet and at least one outlet are arranged on the sealing frame body, and each inlet and each outlet are communicated with the cooling cavity.

As a liquid cooling female preferred scheme of arranging, adjacent two arrange between the body sealed frame body's quantity be two at least, every sealed frame body all with adjacent two female the body of arranging encloses to establish and forms the cooling chamber, two at least sealed frame body follows the length direction interval of arranging the body is arranged, adjacent two form the spread groove between the sealed frame body, the spread groove is used for holding the link bar of treating jointing equipment.

As a preferred scheme of the liquid cooling female arranging, the liquid cooling female arranging further comprises an intermediate piece in one-to-one correspondence with the connecting grooves, the intermediate piece is arranged at one end, far away from the connecting row, of the corresponding connecting groove, and the intermediate piece is communicated with the two adjacent cooling cavities respectively.

As a preferred scheme of the liquid-cooled busbar, the sealing frame body is made of an insulating material, and the cooling medium is insulating liquid.

As a preferred scheme of the liquid-cooled busbar, the side of the busbar body for forming the cooling cavity is subjected to insulation treatment.

As a female preferred scheme who arranges of liquid cooling, female arranging of liquid cooling is including compressing tightly the subassembly, compress tightly the subassembly and include connecting piece and two clamp plates, two the clamp plate interval sets up, all female body of arranging all is located two between the clamp plate, the connecting piece can pass first the clamp plate is fixed in the second the clamp plate.

As a preferred scheme of the liquid cooling busbar, the number of the pressing assemblies is multiple, and the pressing assemblies are arranged at intervals along the length direction of the liquid cooling busbar body.

As a preferred scheme of the liquid cooling busbar, a plurality of turbulence protrusions arranged at intervals are arranged on the side face of the busbar body for forming the cooling cavity.

As a female preferred scheme who arranges of liquid cooling, female arranging of liquid cooling still includes two end plates, all female arranging the body all is located two between the end plate, the end plate is close to one side of female arranging the body is equipped with the recess, the recess can with adjacent female arranging the side of body encloses and establishes and form sealed chamber, hold in the sealed chamber coolant.

The invention has the beneficial effects that:

the invention provides a liquid-cooled busbar which comprises at least two busbar bodies, wherein two adjacent busbar bodies can form a sealed cooling cavity, a cooling medium is contained in the cooling cavity, the busbar bodies in the liquid-cooled busbar can be in direct contact with the cooling medium, the heat exchange area is large, the cooling effect is good, the cooling effect of the busbar bodies can be ensured even under the condition that the distance between the two adjacent busbar bodies is smaller or the length of the busbar body is longer, the current-carrying density of the busbar bodies can be improved, the cross section area of the busbar bodies is reduced, and the manufacturing cost of the busbar bodies is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a liquid-cooling busbar according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a sealing frame according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a liquid-cooled busbar according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of another liquid-cooled busbar according to an embodiment of the invention;

fig. 5 is a schematic diagram illustrating a liquid-cooled busbar and a connecting bar according to a second embodiment of the present invention;

FIG. 6 is an enlarged view at A in FIG. 5;

fig. 7 is a schematic view of the connection row accommodated in the connection groove according to the second embodiment of the present invention.

In the figure:

1-busbar body; 11-a turbulence protrusion;

2-a cooling chamber;

3-sealing the frame body; 31-a first seal groove;

4-a compression assembly; 41-a connector; 42-a pressure plate;

5-an intermediate piece; 6-connecting groove;

100-liquid cooling busbar; 200-connecting rows.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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. Example one

As shown in fig. 1 to 4, the embodiment provides a liquid-cooled busbar 100, where the liquid-cooled busbar 100 includes at least two busbar bodies 1, two adjacent busbar bodies 1 are arranged at an interval, two adjacent busbar bodies 1 can form a sealed cooling cavity 2, and a cooling medium is contained in the cooling cavity 2. In this liquid cooling female row 100, arrange body 1 through adjacent two and form cooling chamber 2, female body 1 of arranging can direct contact with coolant, and female body 1 of arranging is big with coolant direct contact area, the cooling effect is good, even arrange the less or female longer condition of arranging body 1 length of body 1 interval at adjacent two, also can guarantee to arrange the cooling effect of body 1, can improve the current-carrying density who arranges body 1, thereby reduce the cross-sectional area of arranging body 1, reduce the manufacturing cost who arranges body 1.

It can be understood that the larger the sectional area of the cooling cavity 2 is, the larger the contact area between the cooling medium and the two busbar bodies 1 is, and the better the cooling effect is.

Preferably, this female 100 that arranges of liquid cooling includes at least one sealed frame 3, all is equipped with sealed frame 3 between two adjacent female body 1, sealed frame 3 and two adjacent female body 1 of arranging enclose to establish and form cooling chamber 2, and is sealed effectual, low in manufacturing cost, and need not to change the structure of female body 1 self, and application scope is big, can also reduce the manufacturing cost who arranges body 1.

In the embodiment, two opposite side surfaces of two adjacent busbar bodies 1 are respectively abutted against two end surfaces of the sealing frame body 3, on one hand, the sealing frame body 3 is abutted against the busbar bodies 1 through line contact, the abutting effect is good, the contact area between the busbar bodies 1 and the cooling medium is large, and the cooling effect of the busbar bodies 1 can be improved; on the other hand, the whole thickness of the sealing frame body 3 can be reduced, so that a good cooling effect can be obtained when the distance between two adjacent busbar bodies 1 is small.

Certainly, the forming manner of the cooling cavity 2 is not limited to this, in other embodiments, a protruding structure may be arranged on one of two opposite side surfaces of two adjacent busbar bodies 1, the protruding structure is arranged around the periphery of the corresponding busbar body 1, the side wall of the protruding structure is used for forming the side wall of the cooling cavity 2, and the protruding structure and the two opposite side surfaces of the two busbar bodies 1 are arranged around the cooling cavity 2; also can be two adjacent female relative sides of body 1 that arrange all be equipped with protruding structure, two protruding structures of two sides form the lateral wall of cooling chamber 2 jointly, two female relative sides of body 1 and protruding structure enclose to establish and form cooling chamber 2 of arranging for two, can set up according to actual cooling needs, and this embodiment does not do the restriction to this.

In this embodiment, the plurality of busbar bodies 1 have the same size. Of course, in other embodiments, the sizes of the plurality of busbar bodies 1 may also be different, and the busbar bodies may be set according to actual needs, which is not limited in this embodiment.

Specifically, two end faces of the sealing frame body 3 are provided with first sealing grooves 31, first sealing gaskets are filled in the first sealing grooves 31, and the first sealing gaskets can be respectively abutted to the first sealing grooves 31 and the corresponding busbar bodies 1, so that the sealing of the cooling cavity 2 is realized.

Further, two adjacent opposite side faces of the busbar body 1 are provided with a second sealing groove, a second sealing gasket is filled in the second sealing groove, the second sealing gasket can be respectively abutted to the end faces corresponding to the second sealing groove and the sealing frame body 3, the second sealing groove is arranged at intervals with the first sealing groove 31 to form multi-stage sealing, the sealing effect of the cooling cavity 2 can be further improved, and cooling medium leakage is prevented. Of course, the arrangement manner of the second seal groove is not limited to this, in other embodiments, the second seal groove may also be arranged at two end faces of the seal frame body 3, the second seal groove is filled with the second seal gasket, and the second seal groove and the first seal groove 31 are arranged at intervals to form a multi-stage seal, which may be arranged according to the actual sealing requirement, and this embodiment does not limit this.

Optionally, the side of the busbar body 1 for forming the cooling cavity 2 may be further provided with a positioning groove, and the sealing frame 3 may abut against the side wall of the positioning groove to position and limit the sealing frame 3, so as to facilitate assembly of the liquid cooling busbar 100.

Optionally, the sealing frame 3 is provided with at least one inlet and at least one outlet, and each inlet and each outlet are communicated with the cooling cavity 2 to realize circulation of the cooling medium. Further, each inlet and each outlet is provided with a flow meter to monitor the flow of the cooling medium into and out of the cooling chamber 2.

In this embodiment, the height of each inlet and each outlet is the same. Certainly, in other embodiments, when the thickness of the sealing frame 3 is great, the position of the outlet may be set to be higher than the position of the inlet, so that the cooling cavity 2 can be filled with the cooling medium, the cooling effect on the two busbar bodies 1 is ensured, the cooling effect may be set according to actual cooling needs, and the embodiment does not limit this. Preferably, in order to prevent that two adjacent female body 1 electric potentials are different, two adjacent female body 1 through sealed framework 3 and cooling medium short circuit phenomenon appear, cause the damage of treating connecting device conflagration even, sealed framework 3 adopts insulating material to make, and cooling medium is insulating liquid, can avoid two adjacent female body 1 electric potentials to be different short circuit phenomenon appear to protect female body 1 and treating connecting device.

Illustratively, the cooling medium is industrial pure water or insulating oil.

In order to further avoid the short circuit of two adjacent busbar bodies 1, the side surface of the busbar body 1 for forming the cooling cavity 2 is subjected to insulation treatment.

Illustratively, the outer surface of the busbar body 1 is coated with an insulating coating to separate the busbar body 1 from the sealing frame 3 and the cooling medium. Certainly, the insulation processing method of the busbar body 1 is not limited to this, and in other embodiments, the outer surface of the busbar body 1 may be provided with an insulation film, which may be set according to actual insulation requirements, and this embodiment does not limit this.

Preferably, this female 100 that arranges of liquid cooling is including compressing tightly subassembly 4, compress tightly subassembly 4 and include connecting piece 41 and two clamp plates 42, two clamp plates 42 intervals set up, all female body 1 that arranges all are located between two clamp plates 42, connecting piece 41 can pass first clamp plate 42 and be fixed in second clamp plate 42, two clamp plates 42 can be fixed with the female body 1 crimping that arranges of a plurality of, and make every sealed pad all can with the female body 1 tight butt of arranging of the first seal groove 31 that corresponds and corresponding, guarantee the leakproofness of every cooling chamber 2. Certainly, the pressing mode of the busbar body 1 is not limited to this, and the pressing of the busbar body 1 can also be realized by adopting other structures, and the pressing mode can be set according to the actual pressing requirement, and this embodiment does not limit this.

Wherein, in order to ensure the crimping effect of the pressing component 4, the number of the connecting pieces 41 can be multiple.

Further, the quantity of crimping subassembly is a plurality of, and a plurality of subassemblies 4 that compress tightly set up along female length direction interval of arranging body 1, can guarantee the effect that compresses tightly of a plurality of female body 1 of arranging, can also adjust the quantity and the interval that compress tightly subassembly 4 according to female body 1 of arranging of difference in a flexible way, and application scope is wide.

Preferably, female side that arranges body 1 and be used for forming cooling chamber 2 is equipped with the protruding 11 of vortex that a plurality of intervals set up, and the protruding 11 setting of vortex can make coolant form the torrent in cooling chamber 2 to increase coolant's heat convection coefficient improves female cooling effect who arranges body 1. Further, the turbulence protrusions 11 are made of heat conducting materials, so that the cooling area can be increased, and the cooling effect of the busbar body 1 is further improved. It can be understood that the busbar body 1 and the plurality of turbulence protrusions 11 may be made of the same material, or may be made of different materials, and may be designed according to actual needs, which is not limited in this embodiment.

Exemplarily, the cross-sectional shape of the turbulence protrusion 11 is rectangular, and the turbulence protrusion 11 extends along the width direction of the busbar body 1 to play a turbulence role on the cooling medium. Of course, the shape of the turbulence protrusion 11 is not limited to this, and in other embodiments, the turbulence protrusion 11 may also be a sphere, which may be set according to actual needs, and this embodiment does not design this.

In this embodiment, all be equipped with vortex arch 11 on two sides that adjacent two female body 1 is relative, the vortex is effectual, can also increase cooling area. For convenience of description, the turbulence protrusions 11 corresponding to two opposite side surfaces of two adjacent busbar bodies 1 are respectively a first turbulence protrusion and a second turbulence protrusion.

Preferably, protruding and the crisscross setting of a plurality of first vortex of vortex and a plurality of second vortex, can further increase the protruding 11 disturbance effects to coolant of vortex, improve coolant's convection heat transfer coefficient to improve the cooling effect to female body 1 that arranges.

Exemplarily, the busbar body 1 and the corresponding turbulence protrusions 11 are of an integrally formed structure, so that the manufacturing cost of the busbar body 1 can be reduced. Certainly, the forming mode of the turbulence protrusions 11 is not limited to this, and in other embodiments, the busbar body 1 may also be formed separately and independently from the plurality of turbulence protrusions 11, and may be set according to actual needs.

Because in a plurality of female body 1 of arranging, the female body 1 of arranging at both ends only one side can form cooling chamber 2 with adjacent female body 1 of arranging, in order to dispel the heat to another side of this female body 1 of arranging, preferably, female 100 of liquid cooling still includes two end plates, all female body 1 of arranging all are located between two end plates, one side that the end plate is close to female body is equipped with the recess, the recess can enclose with adjacent female side of arranging body 1 and establish and form sealed chamber, hold coolant in the sealed chamber.

Certainly, the heat dissipation mode to the female body 1 that arranges at both ends is not limited to this, and in other embodiments, female 100 arranging of liquid cooling can also include the air-cooled subassembly, and the air-out end of air-cooled subassembly sets up with the female body 1 that arranges at both ends and keeps away from one side of cooling chamber 2 relatively, can set up according to actual need, and this embodiment does not restrict this.

It can be understood that when the end plates are adopted to cool the busbar bodies 1 at the two ends, the two end plates and all the busbar bodies 1 can be located between the two pressing plates 42, and the pressing component 4 can provide pressing effect on the end plates. Of course, can also realize through other structures that the end plate sets up according to actual need with the sealing connection between the female body that arranges that corresponds, this embodiment does not do the restriction to this.

Example two

The present embodiment provides a liquid-cooled busbar 100, which is different from the first embodiment in that the number of the sealing frames 3 between two adjacent busbar bodies 1 is at least two.

As shown in fig. 5 and 6, under some working conditions, the potentials of the two adjacent busbar bodies 1 are the same, and the connecting bar 200 of the device to be connected extends into the space between the two adjacent busbar bodies 1 and is electrically connected with the two adjacent busbar bodies 1, so that the electric connection between the connecting bar 200 and the liquid cooling busbar 100 is realized.

As shown in fig. 7, in order to avoid the connecting bar 200, the number of the sealing frame bodies 3 between two adjacent busbar bodies 1 is at least two, each sealing frame body 3 is surrounded with two adjacent busbar bodies 1 to form a cooling cavity 2, at least two sealing frame bodies 3 are arranged along the length direction of the busbar body 1 at intervals, a connecting groove 6 is formed between two adjacent sealing frame bodies 3, the connecting groove 6 is used for accommodating the connecting bar 200, the connection between the device to be connected and the liquid cooling busbar 100 can be conveniently treated, and the cooling effect of the liquid cooling busbar 100 can be ensured.

Further, as shown in fig. 7, the liquid-cooled busbar 100 further includes an intermediate piece 5 corresponding to the connecting groove 6 one to one, the intermediate piece 5 is disposed at one end of the connecting groove 6 far away from the connecting bar 200, and the intermediate piece 6 is respectively communicated with the two adjacent cooling cavities 2, so that the cooling medium in the cooling cavities 2 can flow into the adjacent cooling cavities 2 through the intermediate piece 5, and it is not necessary to provide an inlet and an outlet on each sealing frame 3, that is, between the two adjacent busbar bodies 1, the two sealing frames 3 at the two ends are respectively provided with an inlet and an outlet, and the other sealing frames 3 may not be provided with an inlet and an outlet, so as to achieve the purpose of reducing parts and manufacturing cost of the sealing frames 3. In addition, middleware 5 can also improve the radiating effect to the junction of connecting bar 200 and female body 1 of arranging, avoids the junction high temperature of connecting bar 200 and female body 1 of arranging to influence the normal operating of treating the jointing equipment.

Optionally, at least two sealing frames 3 and at least one intermediate piece 5 between two adjacent busbar bodies 1 are integrally formed, so that the assembly of the liquid-cooled busbar 100 can be facilitated. In addition, since the intermediate member 5 and the sealing frame 3 are integrally formed, a sealing member required for connection can be saved, and the manufacturing cost of the liquid cooling busbar 100 can be reduced.

Optionally, the sealing frame 3 is made of a heat conductive material to improve a heat dissipation effect at a joint of the busbar 200 and the busbar body 1. Further, the intermediate member 5 is made of a heat conducting material, so that the heat dissipation effect of the connection position of the connecting bar 200 and the busbar body 1 can be further improved. It is understood that the intermediate member 5 may also abut against the corresponding connecting bar 200, thereby improving the heat dissipation effect of the liquid-cooled busbar 100.

In the description of the present specification, it is to be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present embodiment and simplifying the description, and do not indicate or imply that the device or structure referred to must have a specific orientation, be configured and operated in a specific orientation, and thus, cannot be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.