WO2022116624A1 - 室外耐高温电气控制柜 - Google Patents

室外耐高温电气控制柜 Download PDF

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Publication number
WO2022116624A1
WO2022116624A1 PCT/CN2021/117372 CN2021117372W WO2022116624A1 WO 2022116624 A1 WO2022116624 A1 WO 2022116624A1 CN 2021117372 W CN2021117372 W CN 2021117372W WO 2022116624 A1 WO2022116624 A1 WO 2022116624A1
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Prior art keywords
cabinet
cabinet body
electrical control
control cabinet
outdoor high
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PCT/CN2021/117372
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English (en)
French (fr)
Inventor
倪晔波
冯广周
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太仓德纳森机电工程有限公司
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Publication of WO2022116624A1 publication Critical patent/WO2022116624A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/56—Cooling; Ventilation
    • H02B1/565—Cooling; Ventilation for cabinets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26—Casings; Parts thereof or accessories therefor
    • H02B1/28—Casings; Parts thereof or accessories therefor dustproof, splashproof, drip-proof, waterproof or flameproof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26—Casings; Parts thereof or accessories therefor
    • H02B1/50—Pedestal- or pad-mounted casings; Parts thereof or accessories therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20536—Modifications to facilitate cooling, ventilating, or heating for racks or cabinets of standardised dimensions, e.g. electronic racks for aircraft or telecommunication equipment
    • H05K7/20554—Forced ventilation of a gaseous coolant
    • H05K7/20572—Forced ventilation of a gaseous coolant within cabinets for removing heat from sub-racks, e.g. plenum

Definitions

  • the utility model relates to an electrical control cabinet, in particular to an outdoor high temperature resistant electrical control cabinet, which belongs to the technical field of electrical control cabinets.
  • the control cabinet is the assembly of switchgear, measuring instruments, protective appliances and auxiliary equipment in a closed or semi-closed metal cabinet or on the screen according to the electrical wiring requirements. and surrounding equipment safety requirements.
  • the circuit can be turned on or off with the help of manual or automatic switches; when there is a fault or abnormal operation, the circuit can be cut off or alarmed with the help of protective appliances.
  • measuring instruments various parameters in operation can be displayed, and some electrical parameters can also be adjusted to prompt or send signals for deviations from the normal working state.
  • the purpose of the present utility model is to provide an outdoor high temperature resistant electrical control cabinet to solve the problems raised in the above background technology.
  • the utility model provides the following technical solutions:
  • An outdoor high temperature resistant electrical control cabinet comprising a cabinet body,
  • the bottom end of the cabinet is fixed with a base that is hollow inside, the top of the base is fixed with a bottom plate that can communicate with the inside of the cabinet, and a first ventilation hole is opened on the outer circumferential side of the base, and the inside of the base is respectively communicate with the outside of the cabinet and the inside of the cabinet through the first ventilation hole and the bottom plate;
  • the front side of the cabinet body is hinged with a cabinet door through hinges, and the side walls of the cabinet body are respectively provided with a number of evenly distributed heat dissipation holes;
  • An exhaust fan is arranged at the middle position of the top of the cabinet body, and the exhaust fan is fixedly connected to the cabinet body and extends to the interior of the cabinet body;
  • the top edge of the cabinet is provided with a bracket fixedly connected to the cabinet, and the top of the bracket is provided with a reflective device;
  • the inside of the cabinet body is screwed and fixed with a number of evenly distributed wiring boards, the bottom end of the wiring board is provided with a control board, and the control board is screwed and fixed with the cabinet body.
  • the reflective device includes a reflective arc plate and a reflective plate slot, the bottom end of the reflective plate slot is fixedly connected to the bracket, the top end of the reflective plate slot is provided with a groove, and the reflective arc plate is positioned at the at the top of the groove.
  • a rubber ring is fixed outside the bottom end of the reflective arc-shaped plate, and the reflective arc-shaped plate is fixed by engaging with the groove of the reflective plate groove through the rubber ring.
  • a handle is provided at the top edge of the reflective arc-shaped plate.
  • the bottom plate is provided with a plurality of rectangular second ventilation holes evenly spaced, the first ventilation holes communicate with the second ventilation holes through the inside of the base, so that the inside of the cabinet is communicated with the outside of the cabinet.
  • a dustproof net is fixed inside the second ventilation hole.
  • the first ventilation hole is defined on each circumferential side wall of the base.
  • a perspective window is fixed on the cabinet door.
  • the cabinet body is composed of SMC composite material boards spliced together.
  • the outdoor temperature is high in summer, and the outdoor electrical control cabinet generates heat after strong illumination.
  • the reflective arc plate is installed on the top of the electrical control cabinet, the sunlight can be reflected to the surroundings without collecting heat, and the reflective arc plate There is a certain distance between it and the electrical control cabinet, which can effectively prevent sun and heat insulation;
  • Dust is easy to accumulate in the cabinet of the outdoor electrical control cabinet, and the dust can easily increase the load between the electrical components in the electrical control cabinet and affect the use.
  • the ventilation holes and the exhaust fan can make the electrical control
  • the air in the cabinet is circulated, so that the dust does not adhere to the wires or accumulate in a corner, and it can also achieve the effect of heat dissipation;
  • the rubber ring provided at the bottom end of the reflective arc-shaped plate can be fixed with the groove of the reflective plate, and the top of the reflective arc-shaped plate is provided with a handle, which is convenient for the replacement of the reflective arc-shaped plate.
  • Figure 1 is a schematic structural diagram of an outdoor high temperature resistant electrical control cabinet
  • Figure 2 is a schematic structural diagram of a frontal section in an outdoor high temperature resistant electrical control cabinet
  • FIG. 3 is a schematic diagram of the overall structure of a reflective device in an outdoor high-temperature-resistant electrical control cabinet
  • Fig. 4 is a top-view structural schematic diagram of an exhaust fan in an outdoor high-temperature-resistant electrical control cabinet
  • FIG. 5 is a schematic structural diagram of a bottom plate in an outdoor high temperature resistant electrical control cabinet
  • FIG. 6 is a schematic top view of the interior of an outdoor high temperature resistant electrical control cabinet.
  • base 111, first ventilation hole; 112, wiring board; 113, control panel;
  • FIGS. 1 to 6 the following specific embodiments describe in detail an outdoor high temperature resistant electrical control cabinet.
  • the outdoor high temperature resistant electrical control cabinet includes a cabinet body 1, and the cabinet body 1 can be set as a cabinet-like structure with a hollow interior.
  • the cabinet body 1 is formed by splicing SMC composite material boards.
  • the interior of the cabinet body 1 is screwed and fixed with a number of evenly distributed wiring boards 112.
  • the bottom end of the wiring board 112 is provided with a control board 113.
  • the control board 113 is screwed and fixed with the cabinet body 1.
  • the electrical components in 1 are arranged in an orderly manner, which is convenient for searching and maintenance.
  • the bottom end of the cabinet 1 is fixed with a hollow base 11
  • the top of the base 11 is fixed with a bottom plate 16 that can communicate with the inside of the cabinet
  • a first ventilation hole 111 is opened on the outer circumferential side of the base 11 .
  • each circumferential side wall of the base 11 is provided with a first ventilation hole 111 to allow more air to enter the cabinet 1 .
  • the inside of the base is communicated with the outside of the cabinet and the inside of the cabinet respectively through the first ventilation hole and the bottom plate.
  • the bottom plate 16 is provided with a plurality of rectangular second ventilation holes 161 evenly spaced apart. More preferably, a dust filter 1611 is fixed inside the second ventilation hole 161 , and the dust filter can effectively isolate the dust in the air from entering the cabinet 1 , thereby affecting the working efficiency of cables inside the cabinet 1 .
  • a cabinet door 13 is hinged on the front side of the cabinet body 1 through hinges, and a see-through window 14 is fixed on the cabinet door 13 .
  • the side walls of the cabinet 1 are respectively provided with a plurality of uniformly distributed heat dissipation holes 12 .
  • An exhaust fan 17 is provided at the middle position of the top of the cabinet body 1 , and the exhaust fan 17 is fixedly connected to the cabinet body 1 and extends to the interior of the cabinet body 1 .
  • the top edge of the cabinet body 1 is provided with a bracket 18 fixedly connected to the cabinet body, and the top end of the bracket 18 is provided with a reflective device 2 .
  • the bracket 18 can support the reflective device 2, so that there is a certain gap between the reflective device and the cabinet, so as to allow airflow to circulate and promote heat dissipation.
  • the reflector 2 includes a reflector arc plate 21 and a reflector groove 23.
  • the bottom end of the reflector groove 23 is fixedly connected to the bracket 18.
  • the top end of the reflector groove 23 is provided with a groove 231, and the reflector arc plate 21 is positioned in the groove.
  • the above-mentioned reflective arc plate 21 can reflect sunlight and also reflect the heat energy converted by light.
  • a rubber ring 22 is fixed on the outside of the bottom end of the reflective arc-shaped plate 21, and the reflective arc-shaped plate 21 is fixed by engaging with the groove 231 of the reflective plate groove 23 through the rubber ring 22, so that the reflective arc-shaped plate does not work in strong winds. displacement will occur.
  • a handle 211 is provided at the top edge of the reflective arc-shaped plate 21 , so that the reflective arc-shaped plate 21 can be easily taken and replaced, so as to facilitate the replacement and maintenance of the reflective device 2 .
  • Light is an electromagnetic wave. Electromagnetic waves are formed by the mutual excitation of oscillating electric and magnetic fields. Electric fields and magnetic fields have a powerful effect on charged substances. When light irradiates an object, the atoms and molecules inside the object are affected by the force of the oscillating electromagnetic field in the electromagnetic wave, and then oscillate, that is, the thermal motion of the molecules becomes faster, so the object becomes hot.
  • the reflective arc plate 21 on the top of the electrical control cabinet will reflect the sunlight, and at the same time, the reflective arc plate 21 will also reflect most of the heat, and the reflective arc plate 21 itself will also reflect the sun. A small part of the heat will be absorbed; and the reflective arc plate 21 is separated from the cabinet 1 by a part of the space, and will not transfer the heat absorbed by itself to the cabinet 1 .
  • the reflector slot 23 is connected to the cabinet 1 through the bracket 18.
  • the bottom plate 16 at the bottom of the cabinet 1 and the second ventilation holes 161 and the first ventilation holes 111 in the base 11 can form air circulation with the exhaust fan 17, and the exhaust fan 17 has The outgoing airflow can have a cooling effect on the reflective arc-shaped plate 21 , so the exhaust fan 17 can not only take away the dust in the cabinet 1 but also cool the inside of the cabinet 1 .
  • the heat dissipation holes 12 opened on both sides of the cabinet body 1 can discharge part of the heat, and the dustproof net 1611 provided on the second ventilation holes 161 in the bottom plate 16 can effectively isolate the external dust from entering the interior of the cabinet body 1 through the airflow, and at the same time The air is driven into the cabinet body 1 for internal circulation.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Patch Boards (AREA)

Abstract

一种室外耐高温电气控制柜，控制柜在柜体（1）底端固设有开设有第二通风孔（161）的底座（11），底座外侧开设有第一通风孔（111），柜体侧壁设有散热孔（12），柜体顶端中间位置处设有与柜体连接并延伸至柜体内的抽风机（17）；柜体的顶端边缘处设有支架（18），支架的顶端设有反光装置（2）。夏季室外温度较高，在室外的电气控制柜经过强烈的光照后产生热量，在电气控制柜顶部设置反光弧形板（21）后，可以将阳光反射到四周，不聚集热量，并且反光弧形板与电气控制柜之间有一定的距离，能有效防晒隔热；同时利用抽风机使柜体内外的气流流动起来，能够大大减少热量聚集。

Description

室外耐高温电气控制柜 技术领域
本实用新型涉及一种电气控制柜，尤其涉及一种室外耐高温电气控制柜，属于电气控制柜技术领域。
背景技术
控制柜是按电气接线要求将开关设备、测量仪表、保护电器和辅助设备组装在封闭或半封闭金属柜中或屏幅上，其布置应满足电力系统正常运行的要求，便于检修，不危及人身及周围设备安全等要求。正常运行时可借助手动或自动开关接通或分断电路；故障或不正常运行时借助保护电器切断电路或报警。借测量仪表可显示运行中的各种参数，还可对某些电气参数进行调整，对偏离正常工作状态进行提示或发出信号。
夏季在室外的电气控制柜外部受到长时间的光照，其表面温度会向控制柜内部传递，而电气控制柜内部有控制开关及其部件、输电线缆等，在工作时也会产生大量的热，如果热量不及时排出，会严重影响电气控制柜的正常工作，造成如短路停机等状况。
实用新型内容
本实用新型的目的在于提供一种室外耐高温电气控制柜，以解决上述背景技术中提出的问题。
为实现上述目的，本实用新型提供如下技术方案：
一种室外耐高温电气控制柜，包括柜体，
所述柜体的底端固设有内部中空的底座，该底座的顶端固设有一能够与柜体内部连通的底板，且所述底座的周向外侧开设有第一通风孔，所述底座内部经该第一通风孔和所述底板分别与柜体外部和柜体内部连通；
所述柜体的前侧通过合页铰接有柜门，且柜体的侧壁上分别设有若干个均匀分布的散热孔；
所述柜体的顶端中间位置处设有抽风机，该抽风机固定连接于所述柜体上并延伸至所述柜体的内部；
所述柜体的顶端边缘处设有固定连接于柜体上的支架，且该支架的顶端设有反光装置；
所述柜体的内部螺接固设有若干个均匀分布的排线板，所述排线板的底端设有控制板，所述控制板与所述柜体螺接固定。
其进一步的技术方案是：
所述反光装置包括反光弧形板和反光板槽，所述反光板槽的底端与所述支架固定连接，所述反光板槽的顶端开设有凹槽，所述反光弧形板定位设于所述凹槽的顶端处。
其进一步的技术方案是：
所述反光弧形板的底端外部固设有橡胶圈，所述反光弧形板通过所述橡胶圈与所述反光板槽的凹槽卡合固定。
其进一步的技术方案是：
所述反光弧形板的顶端边缘处设有把手。
其进一步的技术方案是：
所述底板上开设有若干个间隔均匀分布且呈矩形的第二通风孔，所述第一通风孔经底座内部与该第二通风孔连通使柜体内部和柜体外部连通。
其进一步的技术方案是：
所述第二通风孔的内部固设有防尘网。
其进一步的技术方案是：
所述底座的每个周向侧壁上均开设有一所述第一通风孔。
其进一步的技术方案是：
所述柜门上固设有一透视窗。
其进一步的技术方案是：
所述柜体由SMC复合材料板拼接组成。
与现有技术相比，本实用新型的有益效果是：
1、夏季室外温度较高，在室外的电气控制柜经过强烈的光照后产生热量，在电气控制柜顶部设置反光弧形板后，可以将阳光反射到四周，不聚集热量，并且反光弧形板与电气控制柜之间有一定的距离，能有效防晒隔热；
2、在室外的电气控制柜的柜内容易堆积灰尘，灰尘容易让电气控制柜内的电器元件之间电阻增大负荷，影响使用。在电气控制柜的顶部设有抽风机，底部设有第一通风孔和第二通风孔，第二通风孔内设置了防尘网，有效减少灰尘进入柜体，通风孔和抽风机能使电气控制柜内的空气流通，让灰尘不附着在电线或堆积在某个角落内，同时也能达到散热的效果；
3、反光弧形板的底端设有的橡胶圈能与反光板槽卡合固定，并且反光弧形板的顶部设有把手，方便反光弧形板的更换。
附图说明
图1为一种室外耐高温电气控制柜的结构示意图；
图2为一种室外耐高温电气控制柜中正面剖视的结构示意图；
图3为一种室外耐高温电气控制柜中反光装置的整体结构示意图；
图4为一种室外耐高温电气控制柜中抽风机的俯视结构示意图；
图5为一种室外耐高温电气控制柜中底板的结构示意图；
图6为一种室外耐高温电气控制柜中内部的俯视结构示意图。
图中：
1、柜体；
11、底座；111、第一通风孔；112、排线板；113、控制板；
12、散热孔；
13、柜门；
14、透视窗；
16、底板；161、第二通风孔；1611、防尘网；
17、抽风机；
18、支架；
2、反光装置；
21、反光弧形板；211、把手；
22、橡胶圈；
23、反光板槽；231、凹槽。
具体实施方式
请参阅图1～6，下述具体实施例详细记载了一种室外耐高温电气控制柜。
该室外耐高温电气控制柜包括柜体1，该柜体1可设置为内部中空的柜状结构。优选的，柜体1由SMC复合材料板拼接组成。柜体1的内部螺接固设有若干个均匀分布的排线板112，排线板112的底端设有控制板113，控制板113与柜体1螺接固定，这样设置能将柜体1内的电器元件有序的排列，方便查找维修。
柜体1的底端固设有内部中空的底座11，该底座11的顶端固设有一能够与柜体内部连通的底板16，且底座11的周向外侧开设有第一通风孔111。优选的，底座11的每个周向侧壁上均开设有一第一通风孔111，能让更多的空气进入柜体1。
底座内部经该第一通风孔和底板分别与柜体外部和柜体内部连通。具体的，底板16上开设有若干个间隔均匀分布且呈矩形的第二通风孔161，第一通风孔经底座内部与该第二通风孔连通使柜体内部和柜体外部连通。更优的，第二通风孔161的内部固设有防尘网1611，该防尘网的设置能够有效隔绝空气中的灰尘等进入柜体1，从而影响柜体1内部的线缆工作效率。
柜体1的前侧通过合页铰接有柜门13，柜门13上固设有一透视窗14。柜体1的侧壁上分别设有若干个均匀分布的散热孔12。
柜体1的顶端中间位置处设有抽风机17，抽风机17固定连接于柜体1并延伸至柜体1的内部。
柜体1的顶端边缘处设有固定连接于柜体上的支架18，支架18的顶端设有反光装置2。支架18能将反光装置2支撑起来，使反光装置与柜体之间具有一定的空隙，让气流流通，促进散热。
反光装置2包括反光弧形板21和反光板槽23，反光板槽23的底端与支架18固定连接，反光板槽23的顶端开设有凹槽231，反光弧形板21定位设于凹槽231的顶端处，上述反光弧形板21的设置能反射阳光，同时也反射了光所转换的热能。具体的，反光弧形板21的底端外部固设有橡胶圈22，反光弧形板 21通过橡胶圈22与反光板槽23的凹槽231卡合固定，使反光弧形板在强风天气不会产生位移。此外，反光弧形板21的顶端边缘处设有把手211，能方便拿取更换反光弧形板21，从而方便更换维修反光装置2。
本实用新型的工作原理是：
光是电磁波，电磁波是由震荡的电场和磁场互相激发形成的，电场、磁场对于带电物质有力的作用。光照射到物体，物体内部的原子分子受到电磁波中震荡的电磁场的力的作用，跟着震荡起来，即分子热运动变快，于是物体就变热了。
当阳光照射到电气控制柜的顶部时，电气控制柜顶部的反光弧形板21将阳光进行反射，同时反光弧形板21也会将大部分的热进行反射，同时反光弧形板21本身也会吸收一小部分热量；并且反光弧形板21与柜体1相隔一部分空间，并不会将本身吸收的热量传递给柜体1。
反光板槽23通过支架18与柜体1连接，柜体1底端的底板16与底座11内的第二通风孔161和第一通风孔111能与抽风机17形成空气的流通，抽风机17带出的气流能对反光弧形板21起到降温效果，所以抽风机17既能将柜体1内的灰尘带走又能对柜体1内部进行降温。
同时柜体1两侧开设的散热孔12能排出一部分热量，底板16内第二通风孔161上设有的防尘网1611能有效隔绝外部的灰尘通过气流进入到柜体1内部，同时又能带动空气进入柜体1内部流通。
以上所述的，仅为本实用新型较佳的具体实施方式，但本实用新型的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本实用新型揭露的技术范围内，根据本实用新型的技术方案及其实用新型构思加以等同替换或改变，都应涵盖在本实用新型的保护范围之内。

Claims (9)

  1. 一种室外耐高温电气控制柜，包括柜体(1)，其特征在于：
    所述柜体(1)的底端固设有内部中空的底座(11)，该底座(11)的顶端固设有一能够与柜体内部连通的底板(16)，且所述底座(11)的周向外侧开设有第一通风孔(111)，所述底座内部经该第一通风孔和所述底板分别与柜体外部和柜体内部连通；
    所述柜体(1)的前侧通过合页铰接有柜门(13)，且柜体(1)的侧壁上分别设有若干个均匀分布的散热孔(12)；
    所述柜体(1)的顶端中间位置处设有抽风机(17)，该抽风机(17)固定连接于所述柜体(1)上并延伸至所述柜体(1)的内部；
    所述柜体(1)的顶端边缘处设有固定连接于柜体上的支架(18)，且该支架(18)的顶端设有反光装置(2)；
    所述柜体(1)的内部螺接固设有若干个均匀分布的排线板(112)，所述排线板(112)的底端设有控制板(113)，所述控制板(113)与所述柜体(1)螺接固定。
  2. 根据权利要求1所述的室外耐高温电气控制柜，其特征在于：所述反光装置(2)包括反光弧形板(21)和反光板槽(23)，所述反光板槽(23)的底端与所述支架(18)固定连接，所述反光板槽(23)的顶端开设有凹槽(231)，所述反光弧形板(21)定位设于所述凹槽(231)的顶端处。
  3. 根据权利要求2所述的室外耐高温电气控制柜，其特征在于：所述反光弧形板(21)的底端外部固设有橡胶圈(22)，所述反光弧形板(21)通过所述橡胶圈(22)与所述反光板槽(23)的凹槽(231)卡合固定。
  4. 根据权利要求2所述的室外耐高温电气控制柜，其特征在于：所述反光弧形板(21)的顶端边缘处设有把手(211)。
  5. 根据权利要求1所述的室外耐高温电气控制柜，其特征在于：所述底板(16)上开设有若干个间隔均匀分布且呈矩形的第二通风孔(161)，所述第一通风孔经底座内部与该第二通风孔连通使柜体内部和柜体外部连通。
  6. 根据权利要求5所述的室外耐高温电气控制柜，其特征在于：所述第二通风孔(161)的内部固设有防尘网(1611)。
  7. 根据权利要求1所述的室外耐高温电气控制柜，其特征在于：所述底座(11)的每个周向侧壁上均开设有一所述第一通风孔(111)。
  8. 根据权利要求1所述的室外耐高温电气控制柜，其特征在于：所述柜门(13)上固设有一透视窗(14)。
  9. 根据权利要求1所述的室外耐高温电气控制柜，其特征在于，所述柜体(1)由SMC复合材料板拼接组成。
PCT/CN2021/117372 2020-12-04 2021-09-09 室外耐高温电气控制柜 WO2022116624A1 (zh)

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