阅读说明：本技术 一种充电桩及充电站 (Fill electric pile and charging station ) 是由 张青锋 檀贵友 许林冲 于 2021-10-09 设计创作，主要内容包括：本发明涉及充电桩技术领域,公开了一种充电桩及充电站,该充电桩包括柜体、配电装置和功率变换模块,配电装置设置于柜体内部,功率变换模块与配电装置电连接,功率变换模块被配置为对配电装置的输出进行变换,该充电桩还包括设置于柜体外部的壳体,至少部分功率变换模块位于壳体内部,壳体上设置有第一通风结构,由于该充电桩中,至少部分功率变换模块设置于柜体外部,相应的功率变换模块的热量能够直接由第一通风结构排出至充电桩外部以进行散热,避免了由于功率变换模块的热量不能及时排出引起的热风回流问题,保证功率变换模块的散热效果,从而保证充电桩工作的可靠性。(The invention relates to the technical field of charging piles, and discloses a charging pile and a charging station, wherein the charging pile comprises a cabinet body, a power distribution device and a power conversion module, the power distribution device is arranged in the cabinet body, the power conversion module is electrically connected with the power distribution device, the power conversion module is configured to convert the output of the power distribution device, the charging pile also comprises a shell arranged outside the cabinet body, at least part of the power conversion module is positioned inside the shell, a first ventilation structure is arranged on the shell, because in this fill electric pile, at least partial power conversion module sets up in the external portion of cabinet, and corresponding power conversion module's heat can be directly discharged to filling the electric pile outside by first ventilation structure in order to dispel the heat, has avoided because the hot-blast backward flow problem that the heat of power conversion module can not in time discharge and arouse, guarantees power conversion module's radiating effect to the reliability of the work of the electric pile of filling is guaranteed.)

1. A charging pile, comprising:

the power distribution cabinet comprises a cabinet body (1) and a power distribution device, wherein the power distribution device is arranged inside the cabinet body (1);

the power conversion module is electrically connected with the power distribution device, the power conversion module is configured to convert the output of the power distribution device, the charging pile further comprises a shell (3) arranged outside the cabinet body (1), at least part of the power conversion module is located inside the shell (3), and a first ventilation structure is arranged on the shell (3).

2. Charging pile according to claim 1, characterized in that a second ventilation structure is arranged on the cabinet (1), the first ventilation structure is in communication with the second ventilation structure, the charging pile further comprises a fan (4), the fan (4) is configured to drive wind inside one of the cabinet (1) and the housing (3) to flow to the other through the connection of the first ventilation structure and the second ventilation structure.

3. The charging pile according to claim 2, characterized in that the first ventilation structure comprises a first ventilation portion (31) and a second ventilation portion (32) which are respectively arranged on different side walls of the housing (3), the second ventilation structure comprises a third ventilation portion and a fourth ventilation portion (11) which are respectively arranged on different side walls of the cabinet body (1), the first ventilation portion (31) and the third ventilation portion are hermetically connected, and the fan (4) is configured to drive the wind in the cabinet body (1) to flow into the housing (3) through the third ventilation portion and the first ventilation portion (31) in sequence.

4. A charging pile according to claim 3, characterised in that the fan (4) is arranged inside the housing (3) and close to the first ventilation portion (31), the outlet end of the fan (4) facing the power conversion module inside the housing (3).

5. Charging pile according to claim 2, characterized in that it further comprises a seal (5), said seal (5) being arranged between said cabinet (1) and said casing (3) and being able to abut against said cabinet (1) and said casing (3), respectively.

6. Charging pile according to claim 5, characterized in that it also comprises a fixing element for fixing the connection between the cabinet (1) and the housing (3).

7. A charging pile according to claim 1, characterised in that it further comprises a connection terminal (6), said connection terminal (6) comprising a first (61) and a second (62) adapted connection member, said first (61) and second (62) connection members being electrically connected to said distribution means and to said power conversion module inside said housing (3), respectively.

8. The charging pile according to claim 1, characterized in that the number of the power conversion modules is at least two, and the housings (3) are arranged in one-to-one correspondence with the power conversion modules.

9. A charging pile according to claim 8, characterised in that the housings (3) are stacked in a vertical direction.

10. The charging pile according to claim 9, characterized in that two side walls of two adjacent housings (3) close to each other are respectively provided with a first positioning structure and a second positioning structure which are matched with each other.

11. A charging pile according to any one of claims 1 to 9, characterised in that the power distribution means comprises an ac input module (21), a dc output module (22) and a piling control module (23), the ac input module (21) and the dc output module (22) being electrically connected to the power conversion module respectively, the ac input module (21), the dc output module (22) and the power conversion module being electrically connected to the piling control module (23).

12. A charging station comprising a transformer and at least one charging post according to any one of claims 1 to 11, the primary side of the transformer being connected to a utility grid and the secondary side of the transformer being connected to each charging post.

Technical Field

The invention relates to the technical field of charging piles, in particular to a charging pile and a charging station.

Background

The direct current fills electric pile is electric automobile field widely used battery charging outfit, and the input that the direct current fills electric pile links to each other with public electric wire netting, and the output that the direct current fills electric pile links to each other with electric automobile to charge electric automobile. Specifically, the direct current charging pile mainly comprises an alternating current input module, a power conversion module, a direct current output module and a pile arrangement control module, wherein the input end of the alternating current input module is connected with a public power grid, the power conversion module is respectively connected with the output end of the alternating current input module and the input end of the direct current output module so as to convert input alternating current into direct current, the output end of the direct current output module is connected with an electric automobile, and the pile arrangement control module is respectively connected with the alternating current input module, the power conversion module and the direct current output module so as to respectively control the modules.

In the prior art, the charging pile comprises a cabinet body, and an alternating current input module, a power conversion module, a direct current output module and a whole pile control module are all arranged in the cabinet body. Wherein, the power conversion module is the main heating part of electric pile. In order to dissipate heat inside the power conversion module, the power conversion module needs to be provided with an air inlet and an air outlet communicated with the inside of the power conversion module, so that wind can flow into the inside of the power conversion module to dissipate heat inside the power conversion module. However, since the power conversion module is located inside the cabinet body, hot air exhausted by the power conversion module cannot be exhausted outside the cabinet body in time, and at this time, the hot air exhausted by the power conversion module may reenter the power conversion module, which causes hot air backflow and affects the heat dissipation effect of the power conversion module.

Disclosure of Invention

The invention aims to provide a charging pile, which is good in heat dissipation effect of a power conversion module and good in working reliability.

Therefore, the invention adopts the following technical scheme:

a charging pile, comprising:

the power distribution device is arranged inside the cabinet body;

the power conversion module is electrically connected with the power distribution device, the power conversion module is configured to convert the output of the power distribution device, the charging pile further comprises a shell arranged outside the cabinet body, at least part of the power conversion module is located inside the shell, and a first ventilation structure is arranged on the shell.

As a preferred scheme who fills electric pile, be provided with the second ventilation structure on the cabinet body, first ventilation structure with the second ventilation structure is linked together, fill electric pile still includes the fan, the fan is configured to drive the cabinet body with the wind of one inside of casing in the two flows to the other one of the two through the junction of first ventilation structure with the second ventilation structure.

As a preferred scheme who fills electric pile, first ventilation structure including set up respectively in first ventilation portion and the second ventilation portion of the different lateral walls of casing, the second ventilation structure including set up respectively in third ventilation portion and the fourth ventilation portion of the different lateral walls of the cabinet body, first ventilation portion with third ventilation portion sealing connection, the fan is configured as the drive the internal wind of cabinet passes through in proper order third ventilation portion with first ventilation portion flows in the casing.

As a preferred scheme who fills electric pile, the fan sets up in the casing and be close to the setting of first ventilation portion, the air-out end of fan is towards the inside power conversion module of casing.

As a preferred scheme who fills electric pile, it still includes the sealing member to fill electric pile, the sealing member set up in the cabinet body with between the casing and can respectively with the cabinet body with casing looks butt.

As a preferred scheme who fills electric pile, it still includes the mounting to fill electric pile, be used for the cabinet body with the connection of casing is fixed.

As a preferred scheme who fills electric pile, it still includes connecting terminal to fill electric pile, connecting terminal includes the first connecting piece and the second connecting piece of looks adaptation, first connecting piece with the second connecting piece respectively with distribution device with power conversion module electricity in the casing is connected.

As a preferred scheme who fills electric pile, the quantity of power conversion module is at least two, the casing with power conversion module one-to-one sets up.

As a preferred scheme who fills electric pile, the casing is along the range upon range of setting of vertical direction.

As a preferred scheme who fills electric pile, adjacent two be equipped with the first location structure and the second location structure of looks adaptation on the casing two lateral walls that are close to each other respectively.

As a preferred scheme of charging pile, the power distribution device includes an ac input module, a dc output module and a pile control module, the ac input module and the dc output module are respectively electrically connected to the power conversion module, and the ac input module, the dc output module and the power conversion module are all electrically connected to the pile control module.

The invention has the beneficial effects that:

the invention provides a charging pile, which comprises a cabinet body, a power distribution device and a power conversion module, wherein the power distribution device is arranged inside the cabinet body, the power conversion module is electrically connected with the power distribution device so as to convert the output of the power distribution device, the charging pile also comprises a shell arranged outside the cabinet body, at least part of the power conversion module is positioned in the shell, and the shell is provided with a first ventilation structure, so that the heat of the power conversion module can be directly discharged outside the charging pile through the first ventilation structure, the problem that the heat of the power conversion module cannot be timely discharged out of the cabinet body to cause hot air backflow is avoided, and the heat dissipation effect of the power conversion module and the working reliability of the charging pile are ensured.

The charging station is provided with a charging pile, and the charging pile is good in heat dissipation effect and charging reliability.

Therefore, the invention adopts the following technical scheme:

a charging station comprises a transformer and at least one charging pile, wherein a primary side of the transformer is connected with a public power grid, and a secondary side of the transformer is connected with each charging pile.

The invention has the beneficial effects that:

the invention provides a charging station which comprises a transformer and at least one charging pile, wherein the charging pile is good in heat dissipation effect and capable of ensuring reliability and stability in a charging process.

Drawings

Fig. 1 is a schematic structural diagram of a charging pile provided in an embodiment of the present invention;

fig. 2 is a first cross-sectional view of a charging pile provided in an embodiment of the present invention;

fig. 3 is a second cross-sectional view of a charging pile provided in an embodiment of the present invention;

fig. 4 is a third sectional view of a charging pile provided in the embodiment of the present invention;

fig. 5 is a fourth sectional view of the charging pile according to the embodiment of the present invention.

In the figure:

1-a cabinet body; 11-a fourth ventilation section;

21-an alternating current input module; 22-a direct current output module; 23-pile control module;

3-a shell; 31-a first vent; 32-a second venting portion; 4-a fan; 5-a seal;

6-connection terminal; 61-a first connector; 62-a second connector;

71-PCB board; 72-heat generating unit.

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.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

As shown in fig. 1 and fig. 2, the present embodiment provides a charging pile for charging an electric vehicle. Particularly, this fill electric pile includes the cabinet body 1, distribution device and power transformation module, distribution device sets up in the internal portion of cabinet, power transformation module is connected with distribution device electricity, power transformation module is configured to transform distribution device's output, this fill electric pile still includes casing 3, at least partial power transformation module is located inside casing 3, be provided with first ventilation structure on the casing 3, because in this fills electric pile, at least partial power transformation module sets up in the external portion of cabinet 1, corresponding partial power transformation module can directly dispel the heat through first ventilation structure, the hot-blast backward flow problem of arousing because the heat of power transformation module can not in time discharge has been avoided, guarantee power transformation module's radiating effect, thereby guarantee the reliability of filling electric pile work. In addition, because at least part power conversion module is located the outside of the cabinet body 1, can also reduce the volume of the cabinet body 1, make the cabinet body 1 compact structure, reduce the manufacturing cost of the cabinet body 1, can also make things convenient for the transportation and the assembly of this electric pile simultaneously.

It can be understood that the housing 3 and the cabinet body 1 can have different protection levels to respectively satisfy the protection needs of different components of the charging pile.

In the present embodiment, all the power conversion modules are located inside the casing 3. Of course, the arrangement of the power conversion module is not limited to this, and in other embodiments, one of the dc-ac conversion unit and the ac-ac conversion unit of the power conversion module may be located inside the casing 3, and the other of the dc-ac conversion unit and the ac-ac conversion unit may be located inside the cabinet 1, and may be arranged according to actual needs, which is not limited in this embodiment.

Optionally, the housing 3 is manufactured by a sheet metal process in the prior art, the housing 3 may be made of metal or other materials, and may be set according to actual needs, and the cabinet 1 is similar to the housing 3, and redundant description thereof is not provided in this embodiment.

Specifically, as shown in fig. 2, the power conversion module includes a PCB 71 and a plurality of heat generating units 72, the number of the PCB 71 may be one or at least two, each PCB 71 is provided with the heat generating unit 72, and the heat generating unit 72 may include one or more of a diode, a triode, a field effect transistor, an IGBT, a capacitor, an inductor, a transformer, or a control chip. When the number of the PCB boards 71 is at least two, the PCB boards 71 may be disposed in the housing 3 at intervals along the vertical direction and form a stacked structure, and the specific arrangement of the power conversion modules may be set according to actual design requirements, which is not limited in this embodiment.

Preferably, as shown in fig. 2 and 3, the cabinet body 1 is provided with a second ventilation structure, the second ventilation structure is hermetically connected with the first ventilation structure, the charging pile further comprises a fan 4, the fan 4 is configured to drive the air inside one of the cabinet body 1 and the housing 3 to flow to the other one of the cabinet body 1 and the housing 3, the cabinet body 1 and the housing 3 are communicated to form an air channel, and the fan 4 drives the air to flow, so that the number of the fans 4 required for heat dissipation of the charging pile can be reduced, the fans 4 do not need to be respectively arranged in the cabinet body 1 and the housing 3 to respectively dissipate the heat of the cabinet body 1 and the housing 3, the manufacturing cost of the charging pile can be reduced, the charging pile can be compact in structure, and the size of the charging pile can be reduced.

Specifically, as shown in fig. 1 and fig. 2, the first ventilation structure includes a first ventilation portion 31 and a second ventilation portion 32, the first ventilation portion 31 and the second ventilation portion 32 are respectively disposed on different sidewalls of the housing 3, the second ventilation structure includes a third ventilation portion and a fourth ventilation portion 11, the third ventilation portion and the fourth ventilation portion 11 are respectively disposed on different sidewalls of the cabinet 1, and the first ventilation portion 31 is communicated with the third ventilation portion.

Preferably, as shown in fig. 2, the fan 4 is configured to drive the wind inside the cabinet 1 to flow into the housing 3 through the third ventilation part and the first ventilation part 31 in sequence. Because the calorific capacity of power conversion module is higher than distribution device's calorific capacity, dispel the heat to distribution device earlier, dispel the heat to power conversion module again, can compromise distribution device and power conversion module's heat dissipation demand, avoid carrying out the wind influence after the heat dissipation to power conversion module to subsequent distribution device's radiating effect. Of course, the flowing direction of the wind in the cabinet 1 and the housing 3 is not limited to this, and in other embodiments, as shown in fig. 3, the fan 4 may be configured to drive the wind in the housing 3 to flow into the cabinet 1 through the first ventilation part 31 and the third ventilation part in sequence, so as to improve the heat dissipation effect on the power conversion module, further, the fourth ventilation part 11 is disposed above the cabinet 1, the wind in the cabinet 1 can be discharged from above the cabinet 1, and the influence of the hot wind discharged from the cabinet 1 on the charging process can be reduced.

Preferably, as shown in fig. 2, the fan 4 is disposed in the casing 3 and close to the first ventilating portion 31, and the air outlet end of the fan 4 faces the power conversion module inside the casing 3, so that on one hand, the fan 4 is close to the joint of the first ventilating portion 31 and the third ventilating portion, and can more effectively drive the flow of the wind in the cabinet 1 and the casing 3 at the same time, and on the other hand, the wind blown out by the fan 4 directly blows on the power conversion module inside the casing 3, and the heat dissipation effect on the power conversion module is better. Of course, the position of the fan 4 is not limited to this, in other embodiments, as shown in fig. 4, the fan 4 may be disposed inside the casing 3 and near the second ventilating portion 32, and the air outlet end of the fan 4 faces the second ventilating portion 32, so that the wind energy inside the casing 3 is exhausted from the casing 3 at an increased speed; as shown in fig. 5, the fan 4 may also be disposed in the cabinet 1, and an air outlet end of the fan 4 faces the housing 3, so that the housing 3 has a more compact structure, and the volume of the housing 3 is reduced, which may be set according to actual needs, and this embodiment does not limit this.

Further, the quantity of fan 4 still can be for at least two to improve the radiating effect to distribution device and power conversion module, can set up according to the actual heat dissipation demand that fills electric pile, this embodiment does not do the restriction to this.

Optionally, in order to realize the sealing connection between the first ventilation portion 31 and the third ventilation portion, as shown in fig. 1, the charging pile further includes a sealing member 5, the sealing member 5 is disposed between the cabinet 1 and the housing 3 and can be abutted to the cabinet 1 and the housing 3 respectively, so as to ensure the sealing connection between the first ventilation structure and the second ventilation structure, the sealing effect is good, and the condition of air leakage or water leakage at the joint of the first ventilation structure and the second ventilation structure can be prevented, which affects the normal operation of the power conversion module and the power distribution device.

Specifically, the casing 3 is equipped with the seal groove on being close to the lateral wall of the cabinet body 1, and first ventilation portion 31 is located the inside of seal groove, and sealing member 5 holds in the seal groove, and the both ends of sealing member 5 can respectively with the outer wall of the cabinet body 1 and the inner wall looks butt of seal groove to realize the sealing connection of third ventilation portion and first ventilation portion 31.

Optionally, this fill electric pile still includes the mounting for the connection of cabinet body 1 and casing 3 is fixed. Particularly, one of the cabinet body 1 and the casing 3 two is provided with the through-hole, and another of the cabinet body 1 and the casing 3 two is provided with the screw hole, and the mounting can pass the through-hole and with screw hole threaded connection to realize the fixed connection of the cabinet body 1 and the casing 3, and make things convenient for this installation and the dismantlement of filling electric pile. Further, the quantity of mounting still can be a plurality of, connects cabinet body 1 and casing 3 through a plurality of mountings, can further improve the reliability of being connected of cabinet body 1 and casing 3.

Optionally, in order to prevent dust, rainwater and the like from entering the housing 3 to affect the normal operation of the power conversion module, the charging pile further includes a first protection component disposed inside and/or outside the second ventilation part 32, so as to improve the protection level of the housing 3 and the protection effect on the power conversion module.

Illustratively, the first protection component includes a louver disposed on the housing 3, the louver is located outside the second ventilating portion 32, and the blades of the louver extend downward along the inside-outside direction, so as to effectively prevent dust, rain water and the like from entering the housing 3, and at the same time, the heat dissipation of the housing 3 is not affected. Certainly, the arrangement of the first protection component is not limited to this, and in other embodiments, the first protection component includes the filter pulp arranged inside the second ventilation portion 32, the filter pulp has a good filtering effect, is convenient to replace and has low cost, and the first protection component also can include the shutter and the filter pulp to play a dual protection role, so that the protection effect on the power conversion module is better, and the protection component can be designed according to the actual protection requirement, and this embodiment is not limited to this.

Optionally, this fill electric pile still includes second protection component to prevent that dust and rainwater etc. from getting into cabinet body 1 by fourth ventilation portion 11 and influencing distribution device's normal work. The arrangement of the second protection component is similar to that of the first protection component, and redundant description is not provided in this embodiment.

Preferably, as shown in fig. 2, in order to facilitate the electrical connection between the power conversion module and the power distribution device, the charging stand further includes a connection terminal 6, the connection terminal 6 includes a first connection member 61 and a second connection member 62 which are matched with each other, the first connection member 61 and the second connection member 62 are respectively electrically connected with the power conversion module in the power distribution device and the housing 3, the electrical connection between the power conversion module and the power distribution device can be conveniently realized, the connection is fast and convenient, and the connection reliability is good. Specifically, one of the first connector 61 and the second connector 62 is a plug, and the other of the first connector 61 and the second connector 62 is a socket.

Optionally, first connecting piece 61 is fixed to be set up in cabinet body 1 outside, should fill electric pile and still include connection structure, and first connecting piece 61 passes through connection structure and is connected with the distribution device electricity, can further make things convenient for the connection of first connecting piece 61 and second connecting piece 62 to make things convenient for the assembly and the dismantlement of power conversion module. Wherein, connection structure can include copper bar and/or copper line, can select according to actual connection needs. Preferably, after the power conversion module is assembled with the cabinet body 1, the connecting terminal 6 is located inside the sealing member 5, so that the connecting terminal 6 can be protected, and meanwhile, the waterproof requirement of the connecting terminal 6 is reduced, thereby reducing the manufacturing cost of the charging pile. Further, the number of the connection terminals 6 may also be at least two, so as to ensure the reliability of the electrical connection between the power conversion module and the power distribution device, and the connection terminals may be set according to actual connection requirements, which is not limited in this embodiment.

Preferably, the number of the power conversion modules is at least two, the housings 3 are arranged in one-to-one correspondence with the power conversion modules, at least a part of each power conversion module is located in the corresponding housing 3, the power of the power conversion modules can be increased by arranging at least two power conversion modules connected in parallel with each other, and meanwhile, when the required charging power is low, part of the power conversion modules can be turned off, thereby reducing a large amount of reactive power and standby loss.

Optionally, the housings 3 are stacked in the vertical direction, so that each housing 3 can obtain stable support and is highly reliable in installation.

Further, for the assembly of casing 3, be equipped with first location structure and second location structure on two sides that two adjacent casings 3 are close to each other respectively, first location structure and second location structure can mutually support to fix a position adjacent casing 3, thereby make things convenient for the assembly of casing 3. Exemplarily, first location structure includes the location arch that two at least intervals set up, and second location structure is for the positioning groove with protruding one-to-one in location, and every location arch homoenergetic joint is in the positioning groove who corresponds to the realization is to two adjacent casing 3's location.

The following describes the power distribution apparatus. As shown in fig. 2 to 5, the power distribution apparatus includes an ac input module 21, a dc output module 22, and a pile control module 23, the ac input module 21 and the dc output module 22 are respectively electrically connected to the power conversion module, and the ac input module 21, the dc output module 22, and the power conversion module are all electrically connected to the pile control module 23.

Further, the alternating current input module 21, the direct current output module 22 and the pile control module 23 are arranged at intervals along the vertical direction and consistent with the stacking direction of the shell 3, so that the connection among the corresponding modules can be facilitated, and the cost of the connection structure can be reduced. In this embodiment, the arrangement order of the ac input module 21, the dc output module 22, and the pile control module 23 in the vertical direction is not limited, for example, as shown in fig. 2 and 3, the ac input module 21, the dc output module 22, and the pile control module 23 may be sequentially arranged in the cabinet 1 from bottom to top; as shown in fig. 4, the cabinet body 1 may also include a dc output module 22, an ac input module 21, and a pile arrangement control module 23 in sequence from bottom to top; as shown in fig. 5, the cabinet 1 may further include an ac input module 21, a pile control module 23, and a dc output module 22 from bottom to top. Of course, the arrangement of the ac input module 21, the dc output module 22 and the pile control module 23 is not limited to this, and may be set according to actual needs.

Optionally, this fill electric pile still includes the at least one rifle that charges that sets up in the cabinet body 1 outside, and the rifle that charges is connected with direct current output module 22 electricity for charge for the consumer. In this embodiment, the electric equipment is specifically an electric vehicle.

Optionally, this fill electric pile still includes display module, and display module sets up on the lateral wall of the cabinet body 1 and display module is connected with a whole pile control module 23 electricity, and display module is used for showing various information in the charging process, for example electric quantity information and expense information etc..

The embodiment also provides a charging station, and this charging station includes transformer and at least one and fills electric pile, and the primary side of transformer links to each other with public electric network, and the secondary side of transformer links to each other with each fills electric pile respectively. Fill electric pile's radiating effect good and operational reliability good in this charging station.

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.