阅读说明：本技术 一种变压器冷却降温系统 (Transformer cooling system ) 是由 冯永亮 贺雷 钟荣富 郑再添 于 2021-07-15 设计创作，主要内容包括：本发明涉及电力工程技术领域,公开一种变压器冷却降温系统,制冷装置包括气体冷却器,用于制备冷却气体；冲洗装置包括储液箱,储液箱内储存有冷却液；第一管路组件与制冷装置连通,第一管路组件包括多个喷射角度可调的第一喷头,冷却气体能够经由多个第一喷头吹向变压器散热片；第二管路组件与储液箱连通,第二管路组件包括多个喷射角度可调的第二喷头,冷却液能够经由多个第二喷头喷洒于变压器散热片上；检测模块实时检测变压器的油温,以使控制模块控制制冷装置和/或冲洗装置启动,通过冷却空气和/或冷却液对变压器散热片进行冷却降温,加快变压器油的流动速度,实现变压器的快速降温。(The invention relates to the technical field of power engineering and discloses a transformer cooling system.A refrigerating device comprises a gas cooler for preparing cooling gas; the flushing device comprises a liquid storage tank, wherein cooling liquid is stored in the liquid storage tank; the first pipeline assembly is communicated with the refrigerating device and comprises a plurality of first spray heads with adjustable spray angles, and cooling gas can blow towards the transformer radiating fins through the plurality of first spray heads; the second pipeline assembly is communicated with the liquid storage tank and comprises a plurality of second spray heads with adjustable spray angles, and cooling liquid can be sprayed on the transformer radiating fins through the plurality of second spray heads; the detection module detects the oil temperature of the transformer in real time, so that the control module controls the refrigeration device and/or the flushing device to start, and the cooling air and/or the cooling liquid are used for cooling the transformer cooling fins, so that the flowing speed of the transformer oil is increased, and the rapid cooling of the transformer is realized.)

1. A transformer cooling system, characterized by, includes:

a refrigeration device (1) comprising a gas cooler for producing a cooled gas;

the flushing device (2) comprises a liquid storage tank, and cooling liquid is stored in the liquid storage tank;

the first pipeline assembly (3) is communicated with the refrigerating device (1), the first pipeline assembly (3) comprises a plurality of first spray heads (31) with adjustable spray angles, and cooling gas can be blown to the transformer cooling fins (100) through the plurality of first spray heads (31) to realize cooling;

the second pipeline assembly (4) is communicated with the liquid storage tank, the second pipeline assembly (4) comprises a plurality of second spray heads (41) with adjustable spray angles, and cooling liquid can be sprayed onto the transformer radiating fins (100) through the plurality of second spray heads (41) to realize cooling;

the detection module (5) is used for detecting the oil temperature of the transformer;

and the control module (6) can receive and process the oil temperature information of the transformer, which is obtained by the detection module (5), and controls the refrigeration device (1) and/or the flushing device (2) to be started.

2. The transformer cooling system according to claim 1, wherein the first pipe assembly (3) further comprises a plurality of first pipe sections (32) connected end to end, the plurality of first pipe sections (32) are arranged around the transformer cooling fin (100) and at the top and bottom of the transformer cooling fin (100), and each first pipe section (32) is provided with a plurality of first nozzles (31).

3. The transformer cooling system according to claim 2, wherein the second pipeline assembly (4) further comprises a plurality of second pipeline sections (42) connected end to end, the plurality of second pipeline sections (42) are arranged around the transformer cooling fin (100) and at the top and bottom of the transformer cooling fin (100) and spaced from the first pipeline section (32), and each second pipeline section (42) is provided with a plurality of second nozzles (41).

4. The transformer cooling system according to claim 3, wherein the first pipe section (32) and the second pipe section (42) are both provided with a connecting pipe (321), one end of the connecting pipe (321) is detachably connected to the first pipe section (32) or the second pipe section (42), and the other end of the connecting pipe is rotatably connected to the corresponding first nozzle (31) or the corresponding second nozzle (41), so as to adjust the spraying direction of the first nozzle (31) or the second nozzle (41).

5. The transformer cooling system according to claim 1, wherein a first driving member (322) electrically connected to the control module (6) is disposed on the connecting pipe (321), and an output end of the first driving member (322) is connected to the first nozzle (31) or the second nozzle (41) to drive the first nozzle (31) or the second nozzle (41) to rotate relative to the connecting pipe (321).

6. The transformer cooling system according to claim 3, further comprising a straight-through, a bent-through and a tee (7), wherein the two adjacent first pipe sections (32) and the two adjacent second pipe sections (42) are connected through the straight-through, the bent-through or the tee (7).

7. The transformer cooling system according to claim 1, wherein the flushing device (2) further comprises a second driving member capable of spraying the cooling liquid in the tank to the transformer heat sink (100) via a plurality of second spray heads (41).

8. The transformer cooling system according to claim 1, wherein a first delivery pipe (11) is disposed on the refrigeration apparatus (1), one end of the first delivery pipe (11) away from the refrigeration apparatus (1) is connected to the first pipeline assembly (3), and a first control valve (111) electrically connected to the control module (6) is disposed on the first delivery pipe (11).

9. The transformer cooling system according to claim 1, wherein a second delivery pipe (21) is disposed on the flushing device (2), one end of the second delivery pipe (21) away from the flushing device (2) is connected to the second pipeline assembly (4), and a second control valve (211) electrically connected to the control module (6) is disposed on the second delivery pipe (21).

10. Transformer cooling system according to any of the claims 1 to 9, further comprising an auxiliary cooling device (8) electrically connected to the control module (6), the auxiliary cooling device (8) being in communication with the first pipe assembly (3).

Technical Field

The invention relates to the technical field of power engineering, in particular to a cooling system for a transformer.

Background

At present, most of oil-immersed transformers are cooled by arranging cooling fins, and the cooling fins exchange heat with external heat to realize cooling. For a small-capacity transformer, a cooling fin self-cooling mode can be adopted, and heat can be dissipated through natural convection. However, under the condition of a large-sized transformer with high environmental temperature or large load, the heat generated by the transformer cannot be quickly dissipated by the heat dissipation fins, which easily causes the high oil temperature of the transformer and causes the insufficient output capacity of the transformer.

In the prior art, a fan is usually arranged below a radiating fin, and when the oil temperature is higher, the fan is started to rotate, so that the air flow is accelerated to drive the temperature of the radiating fin to be discharged outwards. However, in a high-temperature weather, the heat exchange speed of the heat sink is gradually reduced with the increase of the ambient temperature, and even if the fan is used, the temperature of the transformer is difficult to be reduced, and the transformer is prone to failure due to overheating.

Disclosure of Invention

Based on the above problems, an object of the present invention is to provide a transformer cooling system, which can perform an all-directional cooling process on a transformer, thereby ensuring the normal use of the transformer.

In order to achieve the purpose, the invention adopts the following technical scheme:

a transformer cooling system, comprising:

a refrigeration device comprising a gas cooler for producing a cooled gas;

the flushing device comprises a liquid storage tank, wherein cooling liquid is stored in the liquid storage tank;

the first pipeline assembly is communicated with the refrigerating device and comprises a plurality of first spray heads with adjustable spray angles, and cooling gas can be blown to transformer radiating fins through the plurality of first spray heads to realize cooling;

the second pipeline assembly is communicated with the liquid storage tank and comprises a plurality of second spray heads with adjustable spray angles, and cooling liquid can be sprayed onto the transformer radiating fins through the plurality of second spray heads to realize cooling;

the detection module is used for detecting the oil temperature of the transformer;

and the control module can receive and process the oil temperature information of the transformer, which is detected and obtained by the detection module, and control the refrigeration device and/or the flushing device to start.

As a preferable scheme of the transformer cooling system of the present invention, the first pipeline assembly further includes a plurality of first pipeline sections connected end to end, the plurality of first pipeline sections are arranged around the transformer cooling fin and at the top and the bottom of the transformer cooling fin, and each first pipeline section is provided with a plurality of first nozzles.

As a preferable scheme of the transformer cooling system of the present invention, the second pipeline assembly further includes a plurality of second pipeline sections connected end to end, the plurality of second pipeline sections are arranged around the transformer cooling fin and at the top and the bottom of the transformer cooling fin, and are spaced from the first pipeline section, and each of the second pipeline sections is provided with a plurality of second nozzles.

As a preferable scheme of the transformer cooling system of the present invention, the first pipe section and the second pipe section are both provided with a connecting pipe, one end of the connecting pipe is detachably connected to the first pipe section or the second pipe section, and the other end of the connecting pipe is rotatably connected to the corresponding first nozzle or the second nozzle, so as to adjust the spraying direction of the first nozzle or the second nozzle.

As a preferable scheme of the transformer cooling system of the present invention, a first driving element electrically connected to the control module is disposed on the connecting pipe, and an output end of the first driving element is connected to the first nozzle or the second nozzle to drive the first nozzle or the second nozzle to rotate relative to the connecting pipe.

As a preferable scheme of the transformer cooling system of the present invention, the transformer cooling system further includes a straight pipe, a bent pipe, and a tee, and the two adjacent first pipe segments and the two adjacent second pipe segments are connected by the straight pipe, the bent pipe, or the tee.

As a preferable aspect of the transformer cooling system of the present invention, the flushing device further includes a second driving member, and the second driving member is capable of spraying the cooling liquid in the liquid storage tank to the transformer cooling fins through the plurality of second nozzles.

As a preferable scheme of the transformer cooling system, a first delivery pipe is arranged on the refrigerating device, one end of the first delivery pipe, which is far away from the refrigerating device, is connected with the first pipeline assembly, and a first control valve electrically connected with the control module is arranged on the first delivery pipe.

As a preferable scheme of the transformer cooling system of the present invention, the flushing device is provided with a second delivery pipe, one end of the second delivery pipe, which is far away from the flushing device, is connected to the second pipeline assembly, and the second delivery pipe is provided with a second control valve electrically connected to the control module.

As a preferable scheme of the transformer cooling system of the present invention, the transformer cooling system further includes an auxiliary refrigeration device electrically connected to the control module, and the auxiliary refrigeration device is communicated with the first pipeline assembly.

The invention has the beneficial effects that:

according to the transformer cooling system provided by the invention, the detection module can detect the oil temperature of the transformer in real time, when the detection module detects that the oil temperature of the transformer is higher than the preset temperature value in the control module, the control module controls the refrigeration device to be started, the cooling gas prepared by the gas cooler is sprayed to the transformer radiating fins through the plurality of first spray heads of the first pipeline assembly, and after the cooling gas is contacted with the transformer radiating fins, the oil in the transformer radiating fins is accelerated to flow due to temperature change, so that heat exchange is carried out, and the effect of cooling the transformer is achieved. When the detection module detects that the oil temperature is lower than the preset temperature value in the control module, the control module controls the refrigeration device to be closed, so that the refrigeration device is prevented from working for a long time, and energy is saved. In high-temperature weather, if the refrigerating device is in an open state, and when the detection module still detects that the oil temperature of the transformer is higher than the preset temperature value in the control module, the control module controls the flushing device to be started, the cooling liquid in the liquid storage tank is sprayed onto the transformer radiating fins through the second spray heads of the second pipeline assemblies, heat on the transformer radiating fins is taken away through vapor evaporation, and cooling of the oil in the transformer radiating fins is accelerated. When the module to be detected detects that the oil temperature is lower than the preset temperature value in the control module, the control module controls the flushing device to be closed. Meanwhile, the flushing device can flush away dust accumulated outside the transformer radiating fins, and the heat exchange efficiency between the transformer radiating fins and the outside is improved. In addition, the spraying direction of cooling gas and cooling liquid can be adjusted by adjusting the rotating angle of the first spray head and the second spray head, so that all positions of the transformer radiating fins can be in contact with the cooling gas and the cooling liquid, the cooling speed is accelerated, and the rapid cooling of the transformer is realized.

Drawings

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

FIG. 1 is a schematic structural diagram of a transformer cooling system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first nozzle of a transformer cooling system according to an embodiment of the present invention.

In the figure:

1-a refrigeration device; 2-a washing device; 3-a first pipe assembly; 4-a second tubing assembly; 5-a detection module;

6-a control module; 7-a tee joint; 8-an auxiliary refrigeration device;

11-a first delivery duct; 111-a first control valve;

21-a second delivery pipe; 211-a second control valve;

31-a first spray head; 32-a first tube section; 321-a connecting pipe; 322-a first drive member;

41-a second spray head; 42-a second tube section;

100-transformer heat sink.

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.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like 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 of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

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

Example one

As shown in fig. 1 and fig. 2, the present embodiment provides a transformer cooling system, which can cool down a large transformer, and includes a refrigeration device 1, a flushing device 2, a first pipeline assembly 3, a second pipeline assembly 4, a detection module 5, and a control module 6.

Wherein the refrigerating device 1 comprises a gas cooler for preparing a cooling gas; the flushing device 2 comprises a liquid storage tank, and cooling liquid is stored in the liquid storage tank; the first pipeline assembly 3 is communicated with the refrigerating device 1, the first pipeline assembly 3 comprises a plurality of first nozzles 31 with adjustable injection angles, and cooling gas can be blown to the transformer radiating fins 100 through the plurality of first nozzles 31 to realize cooling; the second pipeline assembly 4 is communicated with the liquid storage tank, the second pipeline assembly 4 comprises a plurality of second nozzles 41 with adjustable injection angles, and cooling liquid can be sprayed onto the transformer radiating fins 100 through the plurality of second nozzles 41 to realize cooling; the detection module 5 is used for detecting the oil temperature of the transformer; the control module 6 can receive and process the oil temperature information of the transformer detected by the detection module 5, and control the refrigeration device 1 and/or the flushing device 2 to start.

The transformer cooling system that this embodiment provided, detection module 5 can real-time detection transformer's oil temperature, when detection module 5 detected the oil temperature of transformer and is higher than the predetermined temperature value in control module 6, control module 6 control refrigerating plant 1 starts, and spout the cooling gas of gas cooler preparation to transformer fin 100 via a plurality of first shower nozzles 31 of first pipeline subassembly 3, cooling gas and transformer fin 100 contact back, because the oil in temperature variation messenger transformer fin 100 is mobile with higher speed, carry out the heat exchange, thereby reach the effect to transformer cooling. When the detection module 5 detects that the oil temperature is lower than the preset temperature value in the control module 6, the control module 6 controls the refrigeration device 1 to be closed, so that the refrigeration device 1 is prevented from working for a long time, and energy is saved. In high-temperature weather, if the refrigeration device 1 is in an open state, and the detection module 5 still detects that the oil temperature of the transformer is higher than the preset temperature value in the control module 6, the control module 6 controls the flushing device 2 to be started, and sprays the cooling liquid in the liquid storage tank onto the transformer radiating fins 100 through the second spray heads 41 of the second pipeline assembly 4, so that the heat on the transformer radiating fins 100 is taken away through vapor evaporation, and the cooling of the oil in the transformer radiating fins 100 is accelerated. When the module 5 to be detected detects that the oil temperature is lower than the preset temperature value in the control module 6, the control module 6 controls the flushing device 2 to be closed. Meanwhile, the flushing device 2 can flush away dust accumulated outside the transformer radiating fin 100, and the heat exchange efficiency between the transformer radiating fin 100 and the outside is improved. In addition, the spraying directions of the cooling gas and the cooling liquid can be adjusted by adjusting the rotating angles of the first spray head 31 and the second spray head 41, so that all positions of the transformer radiating fins 100 can be contacted with the cooling gas and the cooling liquid, the cooling speed is increased, and the rapid cooling of the transformer is realized.

In this embodiment, the preset temperature value is slightly lower than the maximum temperature value of the oil temperature allowed by the normal operation of the transformer, so as to ensure that the cooling treatment is performed when the oil temperature of the transformer does not reach the maximum temperature value, and prevent the transformer from malfunctioning due to high temperature.

As shown in fig. 1, optionally, the first pipe assembly 3 further includes a plurality of first pipe segments 32 connected end to end, the plurality of first pipe segments 32 are enclosed around the transformer heat sink 100 and at the top and the bottom of the transformer heat sink 100, and each first pipe segment 32 is provided with a plurality of first nozzles 31. In this embodiment, a plurality of transformer fins 100 are arranged side by side at intervals, and the plurality of first pipe segments 32 are distributed on the upper and lower surfaces, the front and rear surfaces, and the left and right surfaces of the plurality of transformer fins 100, so that six surfaces of the transformer fins 100 can all contact with the cooling gas, thereby accelerating the cooling speed. The air outlet of each first nozzle 31 faces the gap between two adjacent transformer radiating fins 100, so that the cooling air sprayed by the first nozzle 31 can be sprayed onto two adjacent transformer radiating fins 100, and the cooling efficiency is improved.

Further, the second pipeline assembly 4 further includes a plurality of second pipeline segments 42 connected end to end, the plurality of second pipeline segments 42 are enclosed around the transformer heat sink 100 and the top and the bottom of the transformer heat sink 100, and are spaced from the first pipeline segment 32, and each second pipeline segment 42 is provided with a plurality of second nozzles 41. That is, the plurality of second pipe segments 42 are distributed on the upper and lower surfaces, the front and rear surfaces, and the left and right surfaces of the plurality of transformer cooling fins 100, so that the six surfaces of the transformer cooling fins 100 can be in contact with the cooling liquid, and the cooling effect is good. The liquid outlet of each second nozzle 41 faces the gap between two adjacent transformer cooling fins 100, so that the two adjacent transformer cooling fins 100 can contact the cooling liquid, and the cooling efficiency is improved.

In this embodiment, a plurality of support columns are fixedly disposed on the ground, and the plurality of first pipe sections 32 of the first pipeline assembly 3 and the plurality of second pipe sections 42 of the second pipeline assembly 4 are all fixed on the support columns. In other embodiments, the first tube segment 32 and the second tube segment 42 may be welded to the transformer heat sink 100 by the support frame.

Optionally, referring to fig. 2, a connection pipe 321 is disposed on each of the first pipe segment 32 and the second pipe segment 42, one end of the connection pipe 321 is detachably connected to the first pipe segment 32 or the second pipe segment 42, and the other end of the connection pipe 321 is rotatably connected to the corresponding first spray head 31 or the corresponding second spray head 41, so as to adjust the spraying direction of the first spray head 31 or the second spray head 41. Specifically, the connecting pipe 321 is provided with a first driving member 322 electrically connected to the control module 6, and an output end of the first driving member 322 is connected to the first nozzle 31 or the second nozzle 41 to drive the first nozzle 31 or the second nozzle 41 to rotate relative to the connecting pipe 321. In the process of cooling transformer cooling fin 100, first driving piece 322 is controlled by control module 6 to start to rotate first nozzle 31 or second nozzle 41, so that the spraying direction of cooling gas and cooling liquid is changed, cooling gas and cooling liquid can be sprayed to each position of transformer cooling fin 100, cooling is accelerated, and the cooling effect is improved. Preferably, the first driving member 322 is a driving motor.

In this embodiment, the first pipe section 32 and the second pipe section 42 are both provided with mounting ports, inner walls of the mounting ports are provided with internal threads, one end of the connecting pipe 321 is provided with external threads, and the connecting pipe 321 is screwed into the mounting ports during mounting, which is convenient to disassemble and assemble. Further, a sealing member is disposed in the mounting opening to ensure that the connection pipe 321 is connected with the first pipe segment 32 or the second pipe segment 42 in a sealing manner.

As shown in fig. 1, optionally, the transformer cooling system further includes a straight-through, a bent-through, and a tee 7, and the two adjacent first pipe segments 32 and the two adjacent second pipe segments 42 are connected by the straight-through, the bent-through, or the tee 7. That is, the two adjacent first pipe sections 32 and the two adjacent second pipe sections 42 are connected at the turn of the first pipe assembly 3 and the second pipe assembly 4 by the elbow, the two adjacent first pipe sections 32 and the two adjacent second pipe sections 42 extending in the same direction are connected by the straight connection, and the three first pipe sections 32 or the three second pipe sections 42 are connected by the tee 7.

Optionally, the flushing device 2 further comprises a second driving member capable of spraying the cooling liquid in the liquid storage tank towards the transformer heat sink 100 via the plurality of second spray heads 41. Preferably, the second driving member is a water pump, the water pump is located in the liquid storage tank, and a water outlet pipe of the water pump is communicated with the second pipeline assembly 4, so as to spray the cooling liquid in the liquid storage tank onto the transformer heat sink 100 through the plurality of second nozzles 41 of the second pipeline assembly 4.

Optionally, a first conveying pipe 11 is arranged on the refrigeration device 1, one end, far away from the refrigeration device 1, of the first conveying pipe 11 is connected with the first pipeline assembly 3, and a first control valve 111 electrically connected with the control module 6 is arranged on the first conveying pipe 11. Referring to fig. 1, the first delivery pipe 11 is connected to the first pipe section 32 of the first pipe assembly 3 through a tee 7. The control module 6 can adjust the opening size of the first control valve 111 to control the delivery amount of the cooling gas. Specifically, the control module 6 adaptively adjusts the gas output of the cooling gas according to the oil temperature information of the transformer detected and obtained by the detection module 5, so that the cooling effect is ensured and the energy is saved.

Optionally, a second delivery pipe 21 is disposed on the flushing device 2, one end of the second delivery pipe 21, which is far away from the flushing device 2, is connected to the second pipeline assembly 4, and a second control valve 211 electrically connected to the control module 6 is disposed on the second delivery pipe 21. That is, one end of the second delivery pipe 21 is connected to the second pipe section 42 of the second pipeline assembly 4 through the tee joint 7, and the other end is connected to the water outlet pipe of the water pump. The control module 6 can adjust the opening size of the second control valve 211 to control the delivery amount of the cooling fluid. Specifically, the control module 6 adaptively adjusts the amount of sprayed cooling liquid according to the oil temperature information of the transformer obtained by detection of the detection module 5, so that the cooling effect is ensured and the energy is saved.

Example two

As shown in fig. 1 and fig. 2, the present embodiment provides a transformer cooling system, wherein the same or corresponding components as or corresponding to the first embodiment are denoted by the same reference numerals as the first embodiment. For the sake of simplicity, only the difference between the second embodiment and the first embodiment is described, in which in this embodiment, optionally, the transformer cooling system further includes an auxiliary cooling device 8 electrically connected to the control module 6, and the auxiliary cooling device 8 is in communication with the first pipeline assembly 3. The auxiliary refrigerating device 8 is a standby device, and when the refrigerating device 1 breaks down, the control module 6 can start the auxiliary refrigerating device 8, so that the normal cooling operation can be ensured. The auxiliary refrigerating device 8 has the same structure as the refrigerating device 1, and is also provided with a first conveying pipe 11, the first conveying pipe 11 is provided with a first control valve 111, and the control module 6 can adaptively adjust the opening degree of the first control valve 111.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated 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.