KR200299296Y1 - A electric boiler using high-frequency heating and heat pipe - Google Patents
A electric boiler using high-frequency heating and heat pipe Download PDFInfo
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- KR200299296Y1 KR200299296Y1 KR20-2002-0029488U KR20020029488U KR200299296Y1 KR 200299296 Y1 KR200299296 Y1 KR 200299296Y1 KR 20020029488 U KR20020029488 U KR 20020029488U KR 200299296 Y1 KR200299296 Y1 KR 200299296Y1
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- heat pipe
- induction heating
- heat
- boiler
- working fluid
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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
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
- F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
- F24H1/16—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled
- F24H1/162—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form helically or spirally coiled using electrical energy supply
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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
- F24H9/02—Casings; Cover lids; Ornamental panels
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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
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1818—Arrangement or mounting of electric heating means
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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
- F24H9/2014—Arrangement or mounting of control or safety devices for water heaters using electrical energy supply
- F24H9/2028—Continuous-flow heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
- F28D15/0275—Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores
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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
- F24H2250/00—Electrical heat generating means
- F24H2250/08—Induction
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- General Induction Heating (AREA)
Abstract
본 고안은 전기보일러에 관한 것으로서, 더욱 상세하게는 고주파 유도가열을 이용하여 열변환 효율이 높고, 급속가열이 가능하여 별도의 물탱크를 구비할 필요가 없이 순간 온수 및 순간 난방이 가능하며, 반영구적이고 구조가 단순하여 부피 및 제조단가가 저렴한 고주파 유도가열 및 히트파이프를 이용한 전기보일러에 관한 것이다.The present invention relates to an electric boiler, and more specifically, high frequency heat conversion efficiency using high frequency induction heating, rapid heating is possible, instantaneous hot water and instant heating without the need for a separate water tank, semi-permanent The present invention relates to an electric boiler using a high frequency induction heating and heat pipe having a simple structure and low volume and a manufacturing cost.
본 고안의 목적은 고주파 유도가열에 의해 히트파이프를 짧은 시간에 집중적으로 가열함과 아울러 급속가열이 가능하여 순간 온수 및 순간 난방이 가능하며, 열변환 효율이 높고, 반영구적이며 구조가 단순하여 부피가 작고 제조단가가 저렴한 고주파 유도가열 및 히트파이프를 이용한 전기보일러를 제공함에 있다.The purpose of the present invention is to heat the heat pipe in a short time by high frequency induction heating, and also rapid heating is possible to instant hot water and instant heating, high heat conversion efficiency, semi-permanent, simple structure, bulky It is to provide an electric boiler using high frequency induction heating and heat pipe which is small and low in manufacturing cost.
상기의 목적을 달성하기 위한 본 고안의 구성은 내부에 소정 공간을 형성하며 소정 보온재로 충진된 보일러 케이스와, 상기 보일러 케이스의 내부에 수직하게 구비되는 히트파이프와, 상기 히트파이프의 하부 외주면에 소정 철판으로 감싸고, 소정 전기코일을 감아 유도기전력에 의해 히트파이프를 가열하는 유도가열장치와, 상기 히트파이프의 상부에는 상기 보일러케이스를 관통하여 외부로 노출되어 히트파이프내의 작동유체를 공급하는 작동유체 주입구와, 상기 히트파이프내의 작동유체가 기화되어 생성되는 기체를 외부로 토출시키는 기체토출밸브와, 상기 히트파이프의 외주면을 따라 구비되는 제1수관과, 상기 히트파이프의 내부 즉, 작동유체내에 구비되는 제2수관과, 상기 제1,2수관의 일측 및 상기 유도가열장치에 구비되어온도를 감지하는 온도감지센서와, 상기 온도감지센서에 의해 상기 유도가열장치의 동작을 제어하여 보일러의 가동을 제어하는 콘트롤부로 구성되어 이루어지는 것을 특징으로 한다.The structure of the present invention for achieving the above object is a boiler case filled with a predetermined heat insulating material and forming a predetermined space therein, a heat pipe provided perpendicularly to the inside of the boiler case, a predetermined on the lower outer peripheral surface of the heat pipe Induction heating device for wrapping a steel plate and winding a predetermined electric coil to heat the heat pipe by induction electromotive force, and a working fluid inlet for supplying a working fluid in the heat pipe through the boiler case at the upper part of the heat pipe. And a gas discharge valve for discharging gas generated by vaporizing the working fluid in the heat pipe to the outside, a first water pipe provided along an outer circumferential surface of the heat pipe, and the inside of the heat pipe, that is, the working fluid. A second water pipe, one side of the first water pipe, and one side of the first water pipe, and the induction heating device to detect a temperature It characterized in that it comprises a temperature sensor and a control unit for controlling the operation of the boiler by controlling the operation of the induction heating apparatus by the temperature sensor.
Description
본 고안은 전기보일러에 관한 것으로서, 더욱 상세하게는 고주파 유도가열을 이용하여 열변환 효율이 높고, 급속가열이 가능하여 별도의 물탱크를 구비할 필요가 없이 순간 온수 및 순간 난방이 가능하며, 반영구적이고 구조가 단순하여 부피 및 제조단가가 저렴한 고주파 유도가열 및 히트파이프를 이용한 전기보일러에 관한 것이다.The present invention relates to an electric boiler, and more specifically, high frequency heat conversion efficiency using high frequency induction heating, rapid heating is possible, instantaneous hot water and instant heating without the need for a separate water tank, semi-permanent The present invention relates to an electric boiler using a high frequency induction heating and heat pipe having a simple structure and low volume and a manufacturing cost.
종래의 증기보일러는 상업부문과 식품부문 그리고 가정용 기타분야에서 사용하고 있는 여러종류의 증기보일러마다 사용연료가 다양하여서 전기에너지, 경유, 석유, LP가스등 그 사용연료의 연소용 버너가 다르고 기능이 다양하며 사용상 화재의 위험과 불완전 연소로 인한 악취는 물론 환경의 오염이 초래되는 결점과 비 경제성을 벗어나지 못하고 있는것이 현실이다.Conventional steam boilers have different fuels for different types of steam boilers used in the commercial, food, and household sectors, and the burners for combustion of fuels such as electric energy, diesel, petroleum, and LP gas are different and function differently. The reality is that the risk of fire and odor from incomplete combustion, as well as the disadvantages and pollution of the environment caused by the use of the environment is not overcome.
현재 국내외 모든 가정별 온수난방은 다양한 연료연소버너를 사용하고 있으나 만족한 만한 열효율을 얻지 못하여 제한된 온수공급과 더운물 사용에 많은 제약을 받고 있으며 수입유화에너지원에 의존하는 관계로 국가경제에 큰 부담을 안겨주고 있는 단점들 있으며 불완전 연소에 따르는 환경오염도 무시 할 수 없었다.Currently, domestic and foreign domestic hot water heating uses various fuel combustion burners, but they are not constrained by limited hot water supply and hot water use because they do not obtain satisfactory thermal efficiency. There are disadvantages and environmental pollution from incomplete combustion was not negligible.
본 고안은 상기의 제반문제점을 해결하기 위해 안출된 것으로서, 본 고안의 목적은 고주파 유도가열에 의해 히트파이프를 짧은 시간에 집중적으로 가열함과 아울러 급속가열이 가능하여 순간 온수 및 순간 난방이 가능하며, 열변환 효율이 높고, 반영구적이며 구조가 단순하여 부피가 작고 제조단가가 저렴한 고주파 유도가열 및 히트파이프를 이용한 전기보일러를 제공함에 있다.The present invention was devised to solve the above problems, and the object of the present invention is to heat the heat pipe in a short time by high frequency induction heating and rapid heating to enable instant hot water and instant heating. The present invention provides an electric boiler using high frequency induction heating and heat pipe, which is small in volume and low in manufacturing cost due to high heat conversion efficiency, semi-permanent structure and simple structure.
상기의 목적을 달성하기 위한 본 고안의 구성은 내부에 소정 공간을 형성하며 소정 보온재로 충진된 보일러 케이스와, 상기 보일러 케이스의 내부에 수직하게 구비되는 히트파이프와, 상기 히트파이프의 하부 외주면에 소정 철판으로 감싸고, 소정 전기코일을 감아 유도기전력에 의해 히트파이프를 가열하는 유도가열장치와, 상기 히트파이프의 상부에는 상기 보일러케이스를 관통하여 외부로 노출되어 히트파이프내의 작동유체를 공급하는 작동유체 주입구와, 상기 히트파이프내의 작동유체가 기화되어 생성되는 기체를 외부로 토출시키는 기체토출밸브와, 상기 히트파이프의 외주면을 따라 구비되는 제1수관과, 상기 히트파이프의 내부 즉, 작동유체내에 구비되는 제2수관과, 상기 제1,2수관의 일측 및 상기 유도가열장치에 구비되어 온도를 감지하는 온도감지센서와, 상기 온도감지센서에 의해 상기 유도가열장치의 동작을 제어하여 보일러의 가동을 제어하는 콘트롤부로 구성되어 이루어지는 것을 특징으로 한다.The structure of the present invention for achieving the above object is a boiler case filled with a predetermined heat insulating material and forming a predetermined space therein, a heat pipe provided perpendicularly to the inside of the boiler case, a predetermined on the lower outer peripheral surface of the heat pipe Induction heating device for wrapping a steel plate and winding a predetermined electric coil to heat the heat pipe by induction electromotive force, and a working fluid inlet for supplying a working fluid in the heat pipe through the boiler case at the upper part of the heat pipe. And a gas discharge valve for discharging gas generated by vaporizing the working fluid in the heat pipe to the outside, a first water pipe provided along an outer circumferential surface of the heat pipe, and the inside of the heat pipe, that is, the working fluid. A second water pipe, one side of the first and second water pipes and the induction heating device is provided to sense the temperature By a temperature sensor and said temperature sensor controls the operation of the induction heating device characterized by comprising the control portion is configured to control the operation of the boiler.
도 1은 본 고안에 따른 고주파 유도가열 및 히트파이프를 이용한 전기보일러를 나타낸 사시도,1 is a perspective view showing an electric boiler using a high frequency induction heating and heat pipe according to the present invention,
도 2는 본 고안에 따른 고주파 유도가열 및 히트파이프를 이용한 전기보일러를 나타낸 측단면도,Figure 2 is a side cross-sectional view showing an electric boiler using a high frequency induction heating and heat pipe according to the present invention,
도 3은 본 고안에 따른 고주파 유도가열 및 히트파이프를 이용한 전기보일러의 히트파이프를 나타낸 사시도.Figure 3 is a perspective view showing a heat pipe of the electric boiler using a high frequency induction heating and heat pipe according to the present invention.
< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>
10 : 보일러 케이스 20 : 히트파이프10: boiler case 20: heat pipe
21 : 작동유체 주입구 22 : 기체토출밸브21: working fluid inlet 22: gas discharge valve
30 : 보온재 40 : 단열재30: heat insulating material 40: heat insulating material
50 : 철판 60 : 전기코일50: iron plate 60: electric coil
70 : 제1수관 80 : 제2수관70: first water pipe 80: second water pipe
90 : 온도감지센서 100 : 콘트롤부90: temperature sensor 100: control unit
이하 첨부된 도면을 참조하여 본 고안의 고주파 유도가열 및 히트파이프를 이용한 전기보일러에 대해 상세히 설명한다.Hereinafter, an electric boiler using high frequency induction heating and a heat pipe of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 고안에 따른 고주파 유도가열 및 히트파이프를 이용한 전기보일러를 나타낸 사시도이고, 도 2는 본 고안에 따른 고주파 유도가열 및 히트파이프를 이용한 전기보일러를 나타낸 측단면도이며, 도 3은 본 고안에 따른 고주파 유도가열 및 히트파이프를 이용한 전기보일러의 히트파이프를 나타낸 사시도이다.1 is a perspective view showing an electric boiler using a high frequency induction heating and heat pipe according to the present invention, Figure 2 is a side cross-sectional view showing an electric boiler using a high frequency induction heating and heat pipe according to the present invention, Figure 3 Is a perspective view showing a heat pipe of an electric boiler using high frequency induction heating and a heat pipe according to the present invention.
상기 도면에 도시된 바와 같이 본 고안은 내부에 소정 공간을 형성한 보일러 케이스(10)가 구비되며 상기 보일러 케이스(10)의 내부에는 히트 파이프(20)를 수직으로 구비하되 상기 히트파이프(20)는 원통형 또는 상부에서 하부로 갈수로 직경이 점차 줄어들도록 하여 깔대기형상이 되도록 한다.As shown in the drawings, the present invention is provided with a boiler case 10 having a predetermined space therein, and a heat pipe 20 is vertically provided inside the boiler case 10, but the heat pipe 20 is provided. Is a cylindrical or top to bottom to gradually reduce the diameter to be a funnel shape.
한편, 상기 보일러 케이스(10)내에는 소정 보온재(30)로 충진하며, 상기 깔대기형상의 히트파이프(20)의 내주면에는 단열재(40)를 구비한다.On the other hand, the boiler case 10 is filled with a predetermined heat insulating material 30, the inner peripheral surface of the funnel-shaped heat pipe 20 is provided with a heat insulating material (40).
또한, 상기 히트파이프(20)의 하부 외주면에는 소정 철판(50)으로 감싸고, 소정 전기코일(60)을 감아 히트파이프(20)를 가열하는 유도가열장치를 구비한다.In addition, the lower outer circumferential surface of the heat pipe 20 is wrapped with a predetermined iron plate 50, is provided with an induction heating device for heating the heat pipe 20 by winding a predetermined electric coil (60).
상기 히트파이프(20)의 상부에는 상기 보일러케이스(10)를 관통하여 외부로 노출되는 작동유체 주입구(21)를 구비하여 히트파이프(20)내의 작동유체를 공급/충진할 수 있도록 한다.The upper portion of the heat pipe 20 is provided with a working fluid inlet 21 through which the boiler case 10 is exposed to the outside to supply / fill the working fluid in the heat pipe 20.
또한, 상기 히트파이프(20)의 장기사용으로 인해 상기 히트파이프(20)내의 작동유체가 기화되어 생성되는 기체를 외부로 토출시키는 기체토출밸브(22)를 구비한다.In addition, there is provided a gas discharge valve 22 for discharging gas generated by the working fluid in the heat pipe 20 vaporized due to the long-term use of the heat pipe 20.
물이 지나는 제1,2수관(70, 80)을 구비하되, 상기 제1수관(70)은 상기 히트파이프(20)의 외주면을 다수번 감도록 구비하고, 제2수관(80)은 상기 히트파이프(20)의 일측을 관통하여 상기 히트파이프(20)의 내부를 따라 다수번 감도록 구비한다.First and second water pipes 70 and 80 through which water passes, provided with the first water pipe 70 wound around the outer circumferential surface of the heat pipe 20 a plurality of times, and the second water pipe 80 is the heat. Passing through one side of the pipe 20 is provided to wound a plurality of times along the inside of the heat pipe (20).
한편, 상기 제1,2수관(70, 80)의 일측 및 상기 유도가열장치에는 온도감지센서(90)를 구비하고, 상기 온도감지센서(90)에 의해 상기 유도가열장치의 동작을 제어하여 보일러의 가동을 제어하는 콘트롤부(100)를 구비한다.On the other hand, one side of the first and second water pipes (70, 80) and the induction heating device is provided with a temperature sensor 90, the temperature sensor 90 by controlling the operation of the induction heating device boiler The control unit 100 for controlling the operation of the.
상기와 같이 구성된 본 고안은 먼저 사용자가 전기코일에 전류를 흐르게 되면 유도기전력에 의해 전기코일이 감겨진 내부, 즉 철판 및 히트파이프의 일단이 가열되게 된다.According to the present invention configured as described above, when a user first flows an electric coil, the inside of the coil wound by the induced electromotive force, that is, one end of the iron plate and the heat pipe is heated.
이때, 유도가열에 의해 상기 철판이 먼저 가열되고, 상기 철판은 상기 히트파이프의 일단을 소정 면적을 가지고 감싸구비되어 넓은 발열면적과, 짧은 시간에 집중적인 가열로 급속가열이 가능하여 효율적으로 히트파이프를 가열하게 된다.At this time, the iron plate is first heated by induction heating, and the iron plate is wrapped around one end of the heat pipe with a predetermined area to enable rapid heating by a large heating area and intensive heating in a short time. Will be heated.
또한, 유도가열의 특성상 히트파이프의 일단 즉, 철판에 에너지를 집중시켜 효율적인 급속가열이 가능하여 별도의 물탱크내에 물을 저장하여 가열할 필요가 없다.In addition, due to the nature of the induction heating, one end of the heat pipe, that is, the energy is concentrated on the iron plate can be efficiently rapid heating, there is no need to store and heat the water in a separate water tank.
한편, 상기 히트파이프가 가열되면 히트파이프내의 작동유체는 대류하며 고온의 열을 상기 히트파이프의 상부로 전달하여 열을 발산하게 된다.On the other hand, when the heat pipe is heated, the working fluid in the heat pipe is convective and transmits heat of high temperature to the upper portion of the heat pipe to dissipate heat.
이때, 상기 히트파이프의 내부 및 외주면에 감싸는 제1,2수관을 가열하여 수관내의 물을 가열하게 된다.At this time, the first and second water pipes wrapped on the inner and outer circumferential surfaces of the heat pipe are heated to heat the water in the water pipes.
따라서, 상기 제1,2수관내에 흐르는 물은 상기 발열하는 히트파이프의 내부 및 외주면을 따라 흐르면서 소정 온도로 가열되어진다.Therefore, the water flowing in the first and second water pipes is heated to a predetermined temperature while flowing along the inner and outer circumferential surfaces of the heat generating heat pipe.
소정 온도로 가열되어진 물은 난방용 및 온수로서 사용될수 있다.The water heated to a predetermined temperature can be used for heating and hot water.
한편, 히트파이프의 장기사용으로 인해 작동유체의 손실은 상기 히트파이프의 작동유체 주입구를 통해 보충하며, 작동유체가 기화되어 생성되는 기체는 기체토출밸브를 통해 배출시킬 수가 있다.On the other hand, the loss of the working fluid due to long-term use of the heat pipe is supplemented through the working fluid inlet of the heat pipe, the gas generated by the working fluid is vaporized can be discharged through the gas discharge valve.
또한, 온도감지센서에 감지된 감지신호에 의해 콘트롤부는 유도가열장치에 전류를 공급/차단하여 가열되는 물의 온도를 임의대로 설정할 수가 있다.In addition, the control unit may arbitrarily set the temperature of the water to be heated by supplying / blocking a current to the induction heating apparatus by the sensing signal sensed by the temperature detecting sensor.
상술한 바와 같이 본 고안은 수직하게 형성된 히트파이프의 내부 및 외주면에 물이 지나는 수관을 감아 구비하고 하부에 유도가열장치로 가열함으로써, 짧은 시간에 집중적인 가열이 가능하여 짧은 시간에 높은 발열량으로 순간온수 및 급속난방이 가능하고, 유도가열의 특성상 전력이 모두 열로 변환됨으로 열변환효율이 매우 높으며, 반영구적이고, 장치의 단순성으로 부피 및 제작단가가 저렴한 효과가 있다.As described above, the present invention is provided with a water pipe through which water passes on the inner and outer circumferential surfaces of a vertically formed heat pipe, and is heated by an induction heating device at the bottom thereof, so that intensive heating is possible in a short time. Hot water and rapid heating are possible, and because of the characteristics of induction heating, all power is converted to heat, so the heat conversion efficiency is very high, semi-permanent, and the simplicity of the device has the effect of low volume and manufacturing cost.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20-2002-0029488U KR200299296Y1 (en) | 2002-10-02 | 2002-10-02 | A electric boiler using high-frequency heating and heat pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20-2002-0029488U KR200299296Y1 (en) | 2002-10-02 | 2002-10-02 | A electric boiler using high-frequency heating and heat pipe |
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| Application Number | Title | Priority Date | Filing Date |
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| KR1020020060076A Division KR20040029699A (en) | 2002-10-02 | 2002-10-02 | A electric boiler using high-frequency heating and heat pipe |
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| Publication Number | Publication Date |
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| KR200299296Y1 true KR200299296Y1 (en) | 2003-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| KR20-2002-0029488U KR200299296Y1 (en) | 2002-10-02 | 2002-10-02 | A electric boiler using high-frequency heating and heat pipe |
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| KR (1) | KR200299296Y1 (en) |
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