KR20020013018A - A control method and apparatus of an electric steam boiler - Google Patents

A control method and apparatus of an electric steam boiler Download PDF

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Publication number
KR20020013018A
KR20020013018A KR1020000046348A KR20000046348A KR20020013018A KR 20020013018 A KR20020013018 A KR 20020013018A KR 1020000046348 A KR1020000046348 A KR 1020000046348A KR 20000046348 A KR20000046348 A KR 20000046348A KR 20020013018 A KR20020013018 A KR 20020013018A
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South Korea
Prior art keywords
water supply
supply pump
water
magnet switch
switch
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KR1020000046348A
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Korean (ko)
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이상갑
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이상갑
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Priority to KR1020000046348A priority Critical patent/KR20020013018A/en
Publication of KR20020013018A publication Critical patent/KR20020013018A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
    • F22B1/30—Electrode boilers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/42—Applications, arrangements, or dispositions of alarm or automatic safety devices
    • F22B37/44—Applications, arrangements, or dispositions of alarm or automatic safety devices of safety valves
    • F22B37/446—Safety devices responsive to overpressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/78—Adaptations or mounting of level indicators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D5/00—Controlling water feed or water level; Automatic water feeding or water-level regulators
    • F22D5/26—Automatic feed-control systems

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)

Abstract

PURPOSE: A method and apparatus for controlling operation of electric steam boiler is provided to continuously produce steam having a uniform pressure and temperature, while improving heat efficiency and stability. CONSTITUTION: A method comprises a first step of detecting the water level of a heating reservoir(34) by using a water level sensing rod(10), and driving a water supply pump(32) by the detected signal, in such a manner that the water supply pump is delayed for a predetermined time period by a delay timer(12); a second step of operating a submerged electric heater(38) by turning on a magnet switch(S2) by the pressure signal and temperature signal sensed by a pressure switch(20) and a temperature sensor(22), and stopping operation of the water supply pump by a magnet switch(S1) connected to the magnet switch(S2). The water level sensing rod is connected to the submerged electric heater through the delay timer and magnet switch(S2) and connected to the water supply pump through the magnet switch(S1). The pressure switch and temperature sensor are connected to the water supply pump through the magnet switch(S2), respectively. Magnet switches are connected in parallel to each other and receive power from a power supply unit(B) which is controlled by a control unit(A) equipped with a digital display(24) and the delay timer.

Description

전기스팀보일러의 제어방법 및 그 장치{A control method and apparatus of an electric steam boiler}A control method and apparatus of an electric steam boiler

본 발명은 의류 제조공장이나 세탁소 등에서 스팀다리미의 스팀공급용으로 사용하는 전기스팀보일러의 제어방법 및 그 장치에 관한 것이다.The present invention relates to a method and apparatus for controlling an electric steam boiler used for supplying steam to a steam iron in a garment manufacturing plant or a laundry.

종래의 전기스팀보일러는 도 2에 도시된 바와 같이 급수도관(30)의 급수펌프(32)를 통해서 가열수조(34)내로 공급된 물(36)을 침수전열기(38)로 가열하여 스팀(40)을 생산함에 있어서, 스팀배출도관(42)을 통한 스팀(40)의 사용량 증가에 대응하는 물보충을 길이가 서로 다른 여러개의 전극(E1), (E2), (E3)을 가진 수위감지기(E)로 제어해 왔었다.As shown in FIG. 2, the conventional electric steam boiler heats the water 36 supplied into the heating water tank 34 through the water supply pump 32 of the water supply conduit 30 to the submerged heater 38 to steam 40. ), The water supplement corresponding to the increased usage of the steam 40 through the steam discharge conduit 42 has a plurality of electrodes (E 1 ), (E 2 ), (E 3 ) of different lengths. It was controlled by the water level detector (E).

즉, 가열수조(34)의 수위가 전극(E1)까지 도달하여 전극(E1)과 전극(E3)이 통전될 때까지 급수펌프(32)를 가동시켜서 가열수조(34)내에 물(36)을 공급하고, 스팀(40)의 사용량 증가로 인하여 가열수조(34)의 수위가 전극(E2)보다 내려가게 되어서 전극(E2), (E1)과 전극(E3)의 통전상태가 단락될 때 급수펌프(32)를 재가동시켜서 물보충을 실시해 왔었다.That is, by the water level in the heating tank 34 operating the water supply pump 32 until the power application electrode (E 1) reaches the electrode (E 1) to the electrode (E 3) water in the heating tank 34 ( 36) and the level of the heating water tank 34 is lowered than the electrode E 2 due to the increase in the amount of use of the steam 40 so that the electrodes E 2 , E 1 and the electrode E 3 are energized. When the state was short-circuited, the water feed pump 32 was restarted and water replenishment was performed.

따라서 종래에는 가열수조(34)에 담겨져 있던 물의 온도보다 현저하게 낮은 온도의 물의 가열수조(34)의 상한수위(h1)와 하한수위(h2)의 수위차(Δh)만큼 가열수조(34)내로 한꺼번에 대량으로 유입되어서 가열수조(34)내의 온도와 압력이 급격하게 떨어지므로 스팀의 생산이 중단되었고, 스팀의 생산이 재개될 때까지 전력이 많이 소요되었으며, 스팀의 생산량을 균일하게 지속시켜 주는 것이 어렵게 되는 까닭에 스팀의 공급량도 균일하게 지속시켜 주기가 어려웠었을 뿐만 아니라 가열수조(34)내의 물의 온도가 자주 급격하게 변화되어서 침수전열기(38)의 내구수명도 단축되었던 까닭에 침수전열기(38)의 잦은 교체주기로 인하여 유지, 보수비용이 많이 드는 등의 문제점이 있었다.Therefore, in the related art, the heating water tank 34 by the water level difference Δh between the upper limit water level h 1 and the lower limit water level h 2 of the heating water tank 34 of water at a temperature significantly lower than the temperature of the water contained in the heating water tank 34. Since the temperature and pressure in the heating water tank (34) drop rapidly in a large quantity at a time, the production of steam was stopped, and a lot of power was consumed until the production of steam was resumed, and the production of steam was uniformly maintained. It was difficult to give a uniform supply of steam because it was difficult to give, as well as because the temperature of the water in the heating water tank 34 was frequently changed drastically, so that the durability life of the immersion heater 38 was also shortened. Due to the frequent replacement cycle of 38), there were problems such as high maintenance and repair costs.

본 발명은 이와 같은 종래기술의 제반 문제점을 해결한 것인 바, 본 발명은 가열수조내의 급수량, 스팀의 온도 및 압력등과 같은 상태변화에 즉응하여서 물의 보충과 침수전열기의 작동제어가 일정한 지연시차를 가지면서 실시간에 이루어지도록 함으로서 열효율이 우수하고 스팀공급량을 균일하게 유지시켜 줄 수 있으며 유지, 보수 및 성능개량 비용을 절감시켜 줄 수 있는 전기스팀보일러의 제어방법 및 그 장치를 제공하는데 기술적 과제를 둔 것이다.The present invention solves all the problems of the prior art, the present invention is a delay time difference between the replenishment of the water and the operation control of the submerged heater in response to changes in the state, such as the amount of water in the heating tank, the temperature and pressure of the steam, etc. The technical problem is to provide an electric steam boiler control method and device that can achieve high thermal efficiency, maintain a uniform steam supply, and reduce the cost of maintenance, repair, and performance by making it happen in real time with the I put it.

도 1은 본 발명에 의한 전기스팀보일러 제어장치의 계통도.1 is a system diagram of an electric steam boiler control apparatus according to the present invention.

도 2는 종래 전기스팀보일러의 개략적인 계통도.2 is a schematic system diagram of a conventional electric steam boiler.

본 발명에 의한 제어장치는 도 1에 예시한 바와 같이 보일러의 통상적인 수동조작부를 포함하는 제어부(A)에 가열수조(34)내의 수위를 감지하여서 수위검출신호를 전송하는 수위감지기를 연결하고, 제어부(A)의 작동명령을 받는 전원공급부(B)에 의해서 작동하는 마그네트 스위치(S1), (S2)에는 각각 급수도관(30)상의 급수펌프(32)와 가열수조(34)쪽 침수전열기(38)를 연결한 것에 있어서, 수위감지기가 접촉되는 물에 의해서 동작하는 한개의 수위감지봉(10)으로 이루어져 있고, 이 수위감지봉(10)은 가열수조(34)의 수위가 상기 수위감지봉(10)아래로 내려갈 때 급수펌프(32)가 약 3초 정도의 지연시차를 가지면서 가동되도록 해주는 제어부(A)의 지연타이머(12)와 연결되어 있다.The control device according to the present invention is connected to a water level sensor for transmitting a water level detection signal by detecting the water level in the heating water tank 34 to the control unit (A) including a conventional manual operation unit of the boiler, as illustrated in FIG. The magnetic switch S 1 and S 2 operated by the power supply B receiving the operation command of the controller A are flooded toward the water supply pump 32 and the heating water tank 34 on the water supply conduit 30, respectively. In the connection of the heater 38, the water level sensor is composed of one water level sensing rod 10 which is operated by water in contact with the water level sensing rod 10, wherein the water level of the heating water tank 34 is equal to the water level. The water supply pump 32 is connected to the delay timer 12 of the control unit A to be operated while having a delay time of about 3 seconds when descending below the sensing rod 10.

급수펌프(32)의 입수구(32a)쪽에는 급수도관(30)내에 물이 정상적으로 흐르는지의 여부를 검출하여서 급수도관(30)내에 물이 없을 경우에는 제어부(A)의 부저(14)를 동작시켜서 경보를 발함과 아울러서 급수펌프(32)의 공회전에 의한 임펠러의 마모를 방지해 주는 급수감지기(16)가 연결되어 있고, 급수펌프(32)의 출수구(32b)쪽에는 급수펌프(32)가 정지중에도 급수도관(30)에 작용하는 수압에 의해서 급수펌프(32)의 임펠러를 통해서 가열수조(34)내로 물이 원하지 않게 유입되는 것을 방지해 주는 솔레노이드 밸브(18)가 연결되어 있다.The water inlet 32a side of the water supply pump 32 detects whether water flows normally in the water supply conduit 30, and when there is no water in the water supply conduit 30, the buzzer 14 of the control unit A is operated. A water supply detector 16 is connected to the water supply pump 32 to prevent the wear of the impeller due to the idling of the water supply pump 32, and the water supply pump 32 is stopped at the outlet 32b side of the water supply pump 32. The solenoid valve 18 which prevents water from flowing into the heating water tank 34 undesirably through the impeller of the water supply pump 32 by the water pressure acting on the water supply conduit 30 is connected.

가열수조(34)에는 압력계(44)와 연결된 압력스위치(20)와, 온도감지기(22)가 설치되어 있고, 이 압력스위치(20)와 온도감지기(22)는 침수전열기(38)쪽 마그네트스위치(S2)와 직접 연결되어 있어서 보일러 운전중 가열수조(34)의 압력과 온도값이 설정한 값을 벗어날 경우에는 침수전열기(38)의 전원공급을 즉시 차단시키면서 압력과 온도를 제어할 수 있도록 되어 있다.The heating water tank 34 is provided with a pressure switch 20 and a temperature sensor 22 connected to the pressure gauge 44. The pressure switch 20 and the temperature sensor 22 are magnet switches on the immersion heater 38 side. Directly connected to (S 2 ) so that the pressure and temperature of the heating water tank 34 during the operation of the boiler is out of the set value, so that the pressure and temperature can be controlled while the power supply of the submerged heater 38 is cut off immediately. It is.

침수전열기(38)와 마그네트 스위치(S2) 사이에는 침수전열기(38)로 공급되는 전류의 아날로그값을 디지털값으로 변환시켜서 제어부(A)의 디지털 디스플레이(24)를 통해 침수전열기(38)로 공급되는 전류값을 보일러 운전자가 쉽게 알아볼 수 있도록 해주는 변류기(26)가 연결되어 있다.Between the immersion heater 38 and the magnet switch (S 2 ) to convert the analog value of the current supplied to the immersion heater 38 to a digital value to the immersion heater 38 through the digital display 24 of the control unit (A) A current transformer 26 is connected which allows the boiler operator to easily recognize the supplied current value.

본 발명에 있어서, 한개의 수위감지봉(10), 급수감지기(16) 및 변류기(26)등으로 부터 입력되는 신호의 처리와, 지연타이머(12), 부저(14) 및 솔레노이드 밸브(18)와 디지털 디스플레이(24)의 작동제어는 제어부(A)에 설치되는 통상의 마이크로 프로세서에 의해서 이루어지고, 제어부(A)에는 AM주파수 대역을 이용하는 무선송신기(29a)와 무선수신기(29b)로 이루어진 원격조작부(29)를 설치하여서 조작의 편의성을 도모할 수도 있다.In the present invention, the processing of the signal input from the one level sensor rod 10, the water supply sensor 16, the current transformer 26 and the like, the delay timer 12, the buzzer 14 and the solenoid valve 18 And control of the operation of the digital display 24 is performed by a conventional microprocessor installed in the control unit A, and the control unit A comprises a remote transmitter consisting of a radio transmitter 29a and a radio receiver 29b using an AM frequency band. The operation part 29 can also be provided for the convenience of operation.

도면 중 미설명 부호 42는 스팀배출관, 50은 안전밸브, 52는 체크밸브, 54는 작동상태 표시램프이다.In the drawings, reference numeral 42 is a steam discharge pipe, 50 is a safety valve, 52 is a check valve, 54 is an operating state indicator lamp.

이와 같이 구성된 본 발명은 보일러를 가동하면 급수펌프(32)의 입수구(32a)쪽에 있는 급수감지기(16)에 의해서 급수도관(30)내에 물이 정상적으로 차있을 때에만 급수펌프(32)의 출수구(32b)쪽에서 급수도관(30)을 폐쇄시켜 주고 있던 솔레노이드 밸브(18)가 급수도관(30)을 개방시켜주고, 동시에 급수펌프(32)가 가동되어서 가열수조(34)내로 물이 채워진다.According to the present invention configured as described above, when the boiler is operated, the outlet of the water supply pump 32 is provided only when water is normally filled in the water supply conduit 30 by the water supply sensor 16 on the inlet 32a side of the water supply pump 32. The solenoid valve 18 closing the water supply conduit 30 on the side 32b) opens the water supply conduit 30, and at the same time, the water supply pump 32 is operated to fill the water into the heating water tank 34.

가열수조(34)내의 수위가 수위감지봉(10)에 도달하게 되면 급수펌프(32)가 정지되고, 침수전열기(38)에 전원이 공급되어서 스팀(40)을 생산한다.When the water level in the heating water tank 34 reaches the water level sensing rod 10, the water supply pump 32 is stopped and power is supplied to the submerged heater 38 to produce steam 40.

생산된 스팀(40)을 사용함에 따라서 가열수조(34)내의 수위가 수위감지봉(10)아래로 내려가면서 침수전열기(38)로 물이 가열되는 것에 의하여 수위가 상기 수위감지봉(10)주위에서 난조(hunting)를 이룰 때 급수펌프(32)가 지연타이머(12)에 의해서 약 3초 정도 늦게 가동하기 시작하면서 가열수조(34)내의 수위가 상기 수위감지봉(10)에 다시 도달하게 될 때까지 재가동하여 물을 보충한 후 정지된다.As the water level in the heating water tank 34 is lowered below the water level sensing rod 10 as the produced steam 40 is used, the water level is heated around the water level sensing rod 10 as the water is heated by the immersion heater 38. The water level in the heating water tank 34 will reach the water level sensing rod 10 again when the water supply pump 32 starts to be operated about 3 seconds later by the delay timer 12 when hunting is performed at. Restart until it is replenished and stop.

이때 급수펌프(32)의 지연가동시간이 3초 미만이면 급수펌프(32)의 모터가 너무 자주 ON/OFF를 반복하게 되므로 기계적 무리가 초래되어서 모터의 수명주기가 단축되고, 급수펌프(32)의 지연가동시간이 3초를 초과하면 한번에 보충되는 물의 량이 많아지게 되어서 침수전열기(38)의 전력소모가 커지게 될 뿐만 아니라 스팀(40)의 생산중단시간도 길어지게 되어서 스팀의 공급량을 균일하게 유지시켜 줄 수 없게 되므로 지연가동시간은 가급적 3초가 되도록 하는 것이 좋다.At this time, if the delayed operating time of the feed water pump 32 is less than 3 seconds, the motor of the feed water pump 32 repeats ON / OFF too often, resulting in mechanical overload, which shortens the life cycle of the motor, and feed water pump 32. When the delayed operating time of more than 3 seconds increases the amount of water to be replenished at once, not only increases the power consumption of the submerged heater 38, but also prolongs the production stop time of the steam 40, thereby uniformly supplying steam. Since it cannot be maintained, it is better to keep the delay time as 3 seconds as possible.

그리고 가열수조(34)에 설치된 압력스위치(20)와 온도감지기(22)는 가열수조(34)에서 생산된 스팀(40)의 압력과 온도가 설정된 값을 초과할 경우에는 침수전열기(38)의 마그네트 스위치(S2)를 OFF시켜서 침수전열기(38)의 전원공급을 즉시 차단시켜 주는 것이기 때문에 압력이 설정된 값을 초과할 경우 단순히 안전밸브(50)을 통하여 스팀(40)을 가열수조(34)밖으로 배출시켜 왔었던 종래의 보일러에비하여서 보일러의 열효율과 안전성을 보다 향상시켜 줄 수 있게 된다.In addition, the pressure switch 20 and the temperature sensor 22 installed in the heating water tank 34 of the immersion heater 38 when the pressure and temperature of the steam 40 produced by the heating water tank 34 exceed a set value. Since the power supply of the submerged heater 38 is cut off immediately by turning off the magnet switch S 2 , when the pressure exceeds the set value, the steam 40 is simply heated through the safety valve 50. Compared with the conventional boiler that has been discharged outside, it is possible to further improve the thermal efficiency and safety of the boiler.

또 침수전열기(38)와 마그네트 스위치(S2)사이에 있는 변류기(26)가 침수전열기(38)로 공급되는 전류값을 디지털값으로 변환시켜서 제어부(A)의 디지털 디스플레이(24)를 통하여 운전자에게 시현해 주는 것이어서 침수전열기(38)의 작동상태를 정확하고 쉽게 살펴볼 수 있도록 해 줄 뿐만 아니라 침수전열기(38)가 고장났을 경우에도 동일한 발열량을 갖는 침수전열기(38)를 쉽고 정확하게 선택하면서 교체할 수 있도록 해준다.In addition, a current transformer 26 between the submerged heater 38 and the magnet switch S 2 converts the current value supplied to the submerged heater 38 into a digital value, thereby driving the driver through the digital display 24 of the controller A. It is possible to easily and accurately select the submerged heater 38 having the same calorific value even when the submerged heater 38 is broken, as well as allowing the user to accurately and easily examine the operating state of the submerged heater 38. To help.

본 발명은 압력과 온도가 비교적 균일한 스팀을 지속적으로 생산할 수 있고, 열효율과 안전성을 향상시켜 줄 수 있으며, 유지보수와 성능개량을 손쉽게 할 수 있는 장점이 있다.The present invention can continuously produce steam with a relatively uniform pressure and temperature, can improve thermal efficiency and safety, and can easily maintain and improve performance.

Claims (3)

가열수조(34)내의 수위를 한개의 수위감지봉(10)으로 검출한 다음에 그 검출신호로 급수펌프(32)를 가동시키되 지연타이머(12)에 의하여 일정시간만큼 늦게 가동되도록 하며, 가열수조(34)내의 압력스위치(20)와 온도감지기(22)로 감지한 압력신호와 온도신호로 마그네트 스위치(S2)를 ON시켜서 침수전열기(38)를 작동시킴과 동시에 마그네트 스위치(S2)와 연결된 마그네트 스위치(S1)에 의하여 급수펌프(32)의 작동이 정지되도록 하는 것을 특징으로 하는 전기스팀보일러의 제어방법.The water level in the heating water tank 34 is detected by one water level sensing rod 10, and then the water supply pump 32 is operated with the detection signal, and is operated by the delay time 12 to be delayed by a predetermined time. (34) turns on the magnet switch (S 2 ) by the pressure signal and the temperature signal detected by the pressure switch 20 and the temperature sensor 22 to operate the immersion heater 38 and at the same time the magnet switch (S 2 ) and Control method of the electric steam boiler, characterized in that the operation of the water supply pump 32 is stopped by the connected magnet switch (S 1 ). 가열수조(34)의 상부쪽에 한개의 수위감지봉(10), 압력스위치(20) 및 온도감지기(22)를 가지며 수위감지봉(10)은 지연타이머(12)를 경유해서 마그네트 스위치(S2)를 통하여 침수전열기(38)와 연결되어 있고 또 마그네트 스위치(S1)을 통하여 급수펌프(32)와 연결되어 있으며, 압력스위치(20)와 온도감지기(22)는 각각 마그네트 스위치(S2)를 통하여 급수펌프(32)와 연결되어 있으며, 디지털 디스플레이(24) 및 지연타이머(12)를 가진 제어부(A)에 의하여 제어되는 전원공급부(B)로 부터 전원을 공급받고 있는 마그네트 스위치(S1)과 마그네트 스위치(S2)는 병열로 연결되어 있는 것을 특징으로 하는 전기스팀보일러의 제어장치.One water level sensing rod 10, a pressure switch 20, and a temperature sensor 22 are provided on the upper side of the heating water tank 34, and the water level sensing rod 10 is a magnet switch S 2 via the delay timer 12. Is connected to the immersion heater 38 and the water supply pump 32 through the magnet switch (S 1 ), the pressure switch 20 and the temperature sensor 22 are respectively a magnet switch (S 2 ) The magnet switch S 1 is connected to the water supply pump 32 and is supplied power from the power supply unit B controlled by the controller A having the digital display 24 and the delay timer 12. ) And the magnetic switch (S 2 ) of the electric steam boiler, characterized in that connected in parallel. 제 2 항에 있어서, 급수펌프(32)의 입수구측(32a)에 급수감지기(16)가 연결되어 있는 것을 특징으로 하는 전기스팀보일러의 제어장치.The electric steam boiler control apparatus according to claim 2, wherein a water supply sensor (16) is connected to an inlet side (32a) of the water supply pump (32).
KR1020000046348A 2000-08-10 2000-08-10 A control method and apparatus of an electric steam boiler KR20020013018A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9841183B2 (en) 2012-12-05 2017-12-12 No Eul Kim Electrode boiler with electrodes unit
RU178599U1 (en) * 2016-09-06 2018-04-11 Общество с ограниченной ответственностью "ДЭНКАР" Electrode Steam Boiler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9841183B2 (en) 2012-12-05 2017-12-12 No Eul Kim Electrode boiler with electrodes unit
RU178599U1 (en) * 2016-09-06 2018-04-11 Общество с ограниченной ответственностью "ДЭНКАР" Electrode Steam Boiler

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