KR19980040047U - Self-diagnosis device of boiler at long time stop - Google Patents

Self-diagnosis device of boiler at long time stop Download PDF

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Publication number
KR19980040047U
KR19980040047U KR2019960053122U KR19960053122U KR19980040047U KR 19980040047 U KR19980040047 U KR 19980040047U KR 2019960053122 U KR2019960053122 U KR 2019960053122U KR 19960053122 U KR19960053122 U KR 19960053122U KR 19980040047 U KR19980040047 U KR 19980040047U
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South Korea
Prior art keywords
checking
abnormality
boiler
water level
long time
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KR2019960053122U
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Korean (ko)
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KR200152392Y1 (en
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유흥민
강병희
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노재훈
주식회사 경동보일러
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Priority to KR2019960053122U priority Critical patent/KR200152392Y1/en
Publication of KR19980040047U publication Critical patent/KR19980040047U/en
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Publication of KR200152392Y1 publication Critical patent/KR200152392Y1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/20—Arrangement or mounting of control or safety devices
    • F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
    • F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/185—Electrical failure alarms
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/187—Machine fault alarms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/10—Fail safe for component failures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2231/00—Fail safe
    • F23N2231/24—Freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0207—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/042—Temperature sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/04—Sensors
    • F24D2220/044—Flow sensors

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

본 고안은 보일러를 장기간 정지시킬 경우 마이크로프로세서를 이용하여 예컨데 1일주기로 각 부위를 점검하여 표시램프나 약속된 방법으로 이상부위를 사용자에게 알려주어 조기에 안전조치를 취하므로 보다 안전하게 운전할 수 있는 장시간 정지시 보일려의 자기진단장치에 관한 것으로, 콘트롤러의 마이크로프로세서(1)에는 송풍기의 이상유무 확인을 위한 송풍기출력부(7)와 RPM 검사부(4)가, 펌프의 이상유무 확인을 위한 펌프출력부(8)와 흐름스위치(6)가, 풍압스위치(10)가 각각 설치되고, 또한 온도센서의 단선 및 이상유무 확인을 위한 온도센서출력부(9), 화염감지센서의 이상유무 확인을 위한 화염검사부(5), 저수위센서의 단선 및 단락, 저수위상태 확인을 위한 수위검사부(2), 정지시 항상 검사를 위한 가스감지입력부(3) 및 동파검사부(11)가 각기 설치된 것을 특징으로 하는 장시간 정지시 보일러의 자기진단장치.When the boiler is stopped for a long time, the microprocessor is used to check each part, for example, on a daily basis, and to inform the user of the abnormal part by indication lamp or the promised method. It relates to a self-diagnosis device that is visible at a stop, and the microprocessor (1) of the controller includes a blower output unit (7) and an RPM inspection unit (4) for checking the abnormality of the blower, and a pump output unit for checking the abnormality of the pump. (8) and the flow switch (6), the wind pressure switch (10) is provided, respectively, and the temperature sensor output unit (9) for checking the disconnection and abnormality of the temperature sensor, flame detection for checking the abnormality of the flame detection sensor The dead zone (5), the disconnection and short circuit of the low water level sensor, the water level inspection unit (2) for checking the low water level status, the gas detection input unit (3) and the freezing wave inspection unit (11) for always inspecting at stop Self-diagnosis device of the boiler at long time characterized in that the installation.

Description

장시간 정지시 보일러의 자기진단장치Self-diagnosis device of boiler at long time stop

본 고안은 보일러를 장기간 정지시킬 경우 마이크로프로세서를 이용하여 예컨데 1일주기로 각 부위를 점검하여 표시램프나 약속된 방법으로 이상부위를 사용자에게 알려주어 조기에 안전조치를 취하므로 보다 안전하게 운전할 수 있는 장시간 정지시 보일려의 자기진단장치에 관한 것이다.When the boiler is stopped for a long time, the microprocessor is used to check each part, for example, on a daily basis, and to inform the user of the abnormal part by indication lamp or the promised method. It relates to a self-diagnosis device of the boiler when stopped.

보통 가정용 보일러는 동절기나 하절기에 우리의 주거문화를 쾌적하게 유지시켜주는 생활의 난방기기이고, 그러한 보일러는 경우에 따라 폭발 및 가스누출 등으로 귀중한 생명과 재산을 빼앗아 가지만, 제품의 품질향상이나 사용연료의 변화 등으로 보일러로 인한 사고가 점차적으로 감소하고 있다.Normally, home boilers are heating devices that keep our living culture pleasant in winter or summer. Such boilers take valuable lives and property by explosion and gas leaks, but improve product quality or use. Due to fuel changes, accidents caused by boilers are gradually decreasing.

즉 사소한 안전사고조차도 근절하기 위해서, 보일려는 이상작동시 폭발 등의 안전사고 예방을 위해 연소안전장치, 과열방지장치 및 저수위 차단장치 등의 기계적인 안전장치가 있다.In other words, in order to eradicate even minor safety accidents, there are mechanical safety devices such as combustion safety devices, overheat protection devices, and low water level shutoff devices to prevent safety accidents such as explosions during abnormal operation.

그런데, 현재 사용하는 보일러는 운전중에만 보일러 각부위 및 기능의 상태를 점검하여 이상현상 발생시 안전장치를 작동시켜 보일러를 정지시키고 점검램프를 점등하여 이상발생상태를 사용자에게 알려 조치를 취하게 하였다.By the way, the boiler currently used only checks the status of each part and function of the boiler only during operation to operate the safety device in case of any abnormality, stops the boiler and turns on the inspection lamp to inform the user of the abnormality.

하지만 위와 같은 점검기능은 보일러가 운전중인 상태에서만 작동되고 있으므로, 보일러를 계속적으로 운전시키지 않게 되는 봄, 여름 및 가을 또는 장마철에는 온수를 사용하거나 잠깐 난방하기 위해 보일러를 작동시키는 경우에는, 조기에 이상이 있음을 발견하지 못하게 되므로 꼭 필요할 때 보일러를 작동시키지 못하는 경우가 종종 있었다.However, the above check function is operated only when the boiler is in operation, so if the boiler is operated to use hot water or to heat for a short time during spring, summer and autumn or the rainy season, the boiler will not operate continuously. It was often impossible to find the presence of this, so it was often impossible to operate the boiler when absolutely necessary.

본 고안은 상기와 같은 문제점을 해결하기 위해 안출한 것으로, 보일러가 장기간 정지된 상태에서도 일정 주기를 갖고 자동으로 마이크로프로세서에서 각부위를 점검하도록 하여 보일러의 운전 유무에 관계없이 상태를 점검하여 이상발생시 바로 사용자에게 표시램프나 약속된 방법으로 알려주어 사후 조치를 취하에 함으로 보일러를 보다 더 안전하고 편리하게 사용할 수 있는 보일러의 자기진단장치를 제공함에 그 목적이 있다.The present invention has been devised to solve the above problems, and even when the boiler is stopped for a long time, the microprocessor automatically checks each part with a certain period and checks the status regardless of the boiler's operation. The purpose of the present invention is to provide a self-diagnosis device for a boiler that can be used more safely and conveniently by informing the user by using a display lamp or a promised method and taking follow-up measures.

제1도는 본 고안에 관한 장시간 정지시 보일러의 자기진단장치를 도시해 놓은 블록도,1 is a block diagram showing a self-diagnosis apparatus of the boiler during a long time stop according to the present invention,

제2도는 본 고안의 자기진단장치를 설명하기 위한 작동흐름도이다.2 is a flow chart illustrating the self-diagnostic apparatus of the present invention.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

1---- 마이크로프로세서2---- 수위검사부1 ---- Microprocessor 2 ---- Level Inspection

3---- 가스감지입력부4---- RPM 검사부3 ---- Gas detection input part 4 ---- RPM inspection part

5---- 화염검사부6---- 흐름스위치5 ---- Flame Inspection 6 ---- Flow Switch

7---- 송풍기출력부8---- 펌프출력부7 ---- Blower output part 8 ---- Pump output part

9---- 온도센서출력부10---- 풍압스위치9 ---- Temperature sensor output 10 ---- Wind pressure switch

11---- 동파검사부11 ---- Freezing Inspection Department

상기 목적을 달성하기 위한 본 고안의 장시간 사용시 보일러의 자기진단장치는, 콘트롤러의 마이크로프로세서(1)에는 송풍기의 이상유무 확인을 위한 송풍기 출력부(7)와 RPM 검사부(4)가, 펌프의 이상유무 확인을 위한 펌프출력부(8)와 흐름스위치(6)가, 풍압스위치(10)가 각각 설치되고, 또한 온도센서의 단선 및 이상유무 확인을 위한 온도센서출력부(9), 화염감지센서의 이상유무 확인을 위한 화염검사부(5), 저수위센서의 단선 및 단락, 저수위상태 확인을 위한 수위검사부(2), 정지시 항상 검사를 위한 가스감지입력부(3) 및 동파검사부(11)가 각기 설치된 것을 그 특징으로 한다.The self-diagnosis apparatus of the boiler during long time use of the present invention for achieving the above object, the microprocessor (1) of the controller, the blower output unit 7 and the RPM inspection unit (4) for checking the abnormality of the blower, the abnormality of the pump The pump output unit 8 and the flow switch 6 for checking the presence and absence of the wind pressure switch 10 are respectively installed, and the temperature sensor output unit 9 and the flame detection sensor for checking the disconnection and abnormality of the temperature sensor. Flame inspection unit (5) for checking the abnormality of the water level, disconnection and short circuit of the low water level sensor, water level inspection unit (2) for checking the low water level state, gas detection input unit (3) and freeze inspection unit (11) for always inspection at stop It is characterized by being installed.

이하, 본 고안의 실시예를 예시도면에 의거하여 상세히 설명한다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제1도는 본 고안에 관한 장시간 정지시 보일러의 자기진단장치를 도시해 놓은 블록도로서, 본 고안의 장시간 정지시 자기진단장치는 종래와 달리 보일러를 장기간 정지시킬 경우에는 콘트롤러의 마이크로프로세서(1)를 이용함에 따라 예컨데 1일주기로 각 부위, 즉 송풍기, 펌프, 풍압스위치(10), 흐름스위치(6), 그리고 온도, 저수위 및 화염감지센서 등을 점검하게 되므로, 도시되지 않는 표시램프나 약속된 방법(예컨데 경보음)으로 이상부위를 사용자에게 알려주어 조기에 안전조치를 취하여 보다 안전하게 운전을 도모할 수 있도록 되어 있다.1 is a block diagram showing the self-diagnosis apparatus of the boiler when the long time stop according to the present invention, unlike the conventional self-diagnosis apparatus is a microprocessor (1) of the controller when stopping the boiler for a long time unlike the conventional For example, each part, that is, the blower, the pump, the wind pressure switch 10, the flow switch 6, and the temperature, low water level and the flame detection sensor, etc. are checked at a daily cycle, so that not shown indicator lamps or By using a method (for example, an alarm sound) to inform the user of the abnormal part, safety measures can be taken early to ensure safer driving.

즉, 상기 콘트롤러의 마이크로프로세서(1)에는 상기와 같은 각부위의 입출력값이 각기 연결되어 있어, 동절기에 사용하고 난 다음에는 장기간 정지될 때 각부위를 가동중에 항시 점검할 뿐만 아니라 정지시 예컨데 24시간인 1일주기로(시간조정이 가능함)각부위를 점검할 수 있다.That is, the microprocessor (1) of the controller is connected to the input and output values of the respective parts as described above, and after using in winter, not only checks each part during operation for a long time after the use in winter, Each part can be inspected on a daily basis (time adjustment is possible).

이는 제2도에 도시된 바와 같이 마이크로프로세서(1)에서 각부위중 송풍기와 풍압스위치(10)를 점검하여 이상부위가 발생되면, 즉 송풍기를 가동시키고 송풍기출력부(7)와 RPM 검사부(4)를 통해 RPM을 측정하여 송풍기 이상시에는 해당 안전장치를 작동시켜 안전조치를 취하고 도시되지 않는 표시램프나 약속된 방법(예컨데 경보음)으로 사용자에게 알릴 수 있다.As shown in FIG. 2, when the microprocessor 1 checks the blower and the wind pressure switch 10 of each part, and an abnormal part is generated, that is, the blower is operated and the blower output part 7 and the RPM inspection part 4 In case of abnormality in blower by measuring RPM, the relevant safety device can be operated to take safety measures and inform the user by not shown indicator lamp or promised method (e.g. alarm sound).

또한, 상기 송풍기가 정상적으로 가동되고 풍압스위치(10)가 이상이 있을 때에는 송풍기출력부(7)와 풍압스위치(10)를 마이크로프로세서(1)에서 점검하여 해당 안전장치를 작동시켜 안전조치를 취하고 도시되지 않는 표시램프나 약속된 경보음으로 사용자에게 시청각적으로 알릴 수 있다.In addition, when the blower is normally operated and the wind pressure switch 10 is abnormal, the blower output unit 7 and the wind pressure switch 10 are inspected by the microprocessor 1 to operate the corresponding safety device to take safety measures. Unsuccessful indication lamps or scheduled alarms can alert the user visually.

한편, 보일러의 송풍기와 풍압스위치(10)가 정상적으로 작동된 상태에서 마이크로프로세서(1)는 펌프를 가동하고 펌프출력부(8)와 흐름스위치(6)를 이용하여 흐름스위치(6)를 점검하게 된다. 이때 상기 마이크로프로세서(1)에서 펌프출력부(8)를 통해 흐름스위치(6)의 이상이 확인되면 해당 안전장치를 작동시켜 안전조치를 취하고 도시되지 않는 표시램프나 약속된 경보음으로 사용자에게 시청각적으로 알릴 수 있다.On the other hand, in a state in which the blower and the wind pressure switch 10 of the boiler are normally operated, the microprocessor 1 operates the pump and checks the flow switch 6 by using the pump output unit 8 and the flow switch 6. do. At this time, if the abnormality of the flow switch (6) is confirmed through the pump output unit 8 in the microprocessor (1), the safety device is operated to take safety measures, and the user is visually visualized with an indication lamp or a promised alarm not shown. Can be informed.

이어 보일러의 송풍기와 풍압스위치(10), 그리고 흐름스위치(6)가 정상적으로 작동된 상태에서 마이크로프로세서(1)는 온도센서, 저수위센서 및 화염감지센서의 이상을 점검할 수 있다.Subsequently, in the state in which the blower, the wind pressure switch 10, and the flow switch 6 of the boiler are normally operated, the microprocessor 1 may check an abnormality of the temperature sensor, the low water level sensor, and the flame detection sensor.

상기 마이크로프로세서(1)에서는 온도센서출력부(9)를 통해 온도센서의 측정값을 비교하여 온도센서의 단선 및 이상유무를 확인할 수 있고, 화염검사부(5)를 통해 화염감지센서의 측정값을 비교하여 화염감지센서의 이상유무를 확인할 수 있으며, 수위검사부(2)를 통해 저수위센서를 검사하여 저수위센서의 단선 및 단락, 저수위상태를 확인할 수 있다.In the microprocessor 1, the temperature sensor output unit 9 compares the measured value of the temperature sensor to check for disconnection and abnormality of the temperature sensor, and the flame detection unit 5 measures the measured value of the flame sensor. In comparison, it is possible to check whether there is an abnormality of the flame detection sensor, and check the low water level sensor through the water level inspection unit 2 to check the disconnection and short circuit of the low water level sensor and the low water level state.

따라서, 상기 마이크로프로세서(1)에서 온도센서, 저수위센서 및 화염감지센서의 이상이 발생되면 바로 사용자에게 표시램프나 약속된 방법으로 알려주어 사후 조치를 취하게 함으로 보일러를 보다 더 안전하고 편리하게 사용할 수 있는 가스감지에는 가스감지입력부(3)를 통해 정지시 마이크로프로세서(1)에서 항상 검사하게 되고, 동절기에 배관의 동파를 방지하기 위해 동파검사부(11)가 마이크로프로세서(1)에 설치된다.Therefore, when an abnormality occurs in the temperature sensor, the low water level sensor and the flame detection sensor in the microprocessor (1), the user can immediately follow the instructions by indicating the indication lamp or a promised method so that the boiler can be used more safely and conveniently. The gas detection can be always inspected by the microprocessor 1 at the time of stopping through the gas sensing input unit 3, and the freezing wave inspection unit 11 is installed in the microprocessor 1 to prevent freezing of pipes in winter.

이상 설명한 바와 같이 본 고안에 의하면, 보일러가 장기간 정지된 상태에서도 일정 주기를 갖고 자동으로 마이크로프로세서에서 각부위를 점검하도록 하여 보일러의 운전 유무에 관계없이 상태를 점검하여 이상발생시 바로 사용자에게 표시램프나 약속된 방법으로 알려주어 사후 조치를 취하게 함으로 보일러를 보다 더 안전하고 편리하게 사용할 수 있는 장시간 정지시 보일러의 자기진단장치를 제공할 수 있다.As described above, according to the present invention, even when the boiler is stopped for a long time, the microprocessor automatically checks each part with a certain period and checks the status regardless of the operation of the boiler. It can provide self-diagnosis device of boiler at long time stop which can make the boiler safer and more convenient.

Claims (2)

콘트롤러의 마이크로프로세서(1)에는 송풍기의 이상유무 확인을 위한 송풍기출력부(7)와 RPM 검사부(4)가, 펌프의 이상유무 확인을 위한 펌프출력부(8)와 흐름스위치(6)가, 풍압스위치(10)가 각각 설치되고, 또한 온도센서의 단선 및 이상유무 확인을 위한 온도센서출력부(9), 화염감지센서의 이상유무 확인을 위한 화염검사부(5), 저수위센서의 단선 및 단락, 저수위상태 확인을 위한 수위검사부(2), 정지시 항상 검사를 위한 가스감지입력부(3) 및 동파검사부(11)가 각기 설치된 것을 특징으로 하는 장시간 정지시 보일러의 자기진단장치.The microprocessor (1) of the controller includes a blower output unit (7) and an RPM inspection unit (4) for checking the abnormality of the blower, and a pump output unit (8) and a flow switch (6) for checking the abnormality of the pump. Wind pressure switch 10 is installed respectively, and the temperature sensor output unit 9 for checking the disconnection and abnormality of the temperature sensor, flame inspection unit (5) for confirming the abnormality of the flame detection sensor, disconnection and short circuit of the low water level sensor , Self-diagnosis device of the boiler for a long time, characterized in that the water level inspection unit (2) for checking the low water level, the gas detection input unit (3) and the freeze inspection unit (11) for always checking when stopped. 제1항에 있어서, 상기 마이크로프로세서(1)에서 1일주일기로 각 부위, 즉 송풍기, 풍압스위치(10), 흐름스위치(6), 그리고 온도센서, 저수위센서 및 화염감지 센서 등을 점검하여 표시램프나 약속된 방법(예컨데 경보음)으로 이상부위를 사용자에게 알려주는 것을 특징으로 하는 장시간 정지시 보일러의 자기진단장치.The display lamp according to claim 1, wherein the microprocessor (1) checks each part, such as a blower, a wind pressure switch (10), a flow switch (6), and a temperature sensor, a low water level sensor, a flame detection sensor, and the like on a daily circumference. B Self-diagnosis device of the boiler at long time stop, characterized by informing the user of abnormalities in a promised way (eg alarm sound).
KR2019960053122U 1996-12-20 1996-12-20 Self-diagnosis device of boiler when the boiler stop for long time KR200152392Y1 (en)

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