KR20020096310A - water level sensing device of dehumidifier - Google Patents
water level sensing device of dehumidifier Download PDFInfo
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- KR20020096310A KR20020096310A KR1020010034703A KR20010034703A KR20020096310A KR 20020096310 A KR20020096310 A KR 20020096310A KR 1020010034703 A KR1020010034703 A KR 1020010034703A KR 20010034703 A KR20010034703 A KR 20010034703A KR 20020096310 A KR20020096310 A KR 20020096310A
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- water level
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- float
- dehumidifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
- G01F23/68—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means
- G01F23/686—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means using opto-electrically actuated indicating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Drying Of Gases (AREA)
Abstract
Description
본 발명은 제습기의 물탱크로 유입되는 수량을 감지하는 수위 감지장치에 관한 것으로서, 보다 상세하게는 유입되는 수량에 따라 단계별로 감지하여 현재 수량을 측정할 수 있고 그 구조가 간단하며 정확한 수위 감지가 가능한 제습기용 수위 감지장치에 관한 것이다.The present invention relates to a water level detection device for detecting the quantity of water introduced into the water tank of the dehumidifier, and more specifically, it is possible to measure the current quantity by detecting in stages according to the quantity of water introduced and its structure is simple and accurate water level detection is A level sensor for possible dehumidifiers is provided.
일반적으로 제습기는 실내 공기 중에 함유된 수분을 제거하는 기기로서, 공기 조화기의 일종이다.Generally, a dehumidifier is a device for removing moisture contained in indoor air, which is a kind of air conditioner.
이러한 제습기는 증발기와 응축기로 이루어져 통과하는 공기 중에 함유된 수분을 제거하는 열교환기와, 실내 공기를 흡입 및 열교환기를 통과시키는 송풍력을 부여하는 송풍팬과, 상기 열교환기의 하측에 배치되어 열교환기에서 제습된 수분이 모아지는 드레인 팬과, 상기 드레인 팬에 모아진 수분이 저장되는 물탱크 등으로 구성된다.The dehumidifier is composed of an evaporator and a condenser, a heat exchanger for removing moisture contained in the air passing through, a blowing fan for providing a blowing force for sucking the indoor air and passing the heat exchanger, and a heat exchanger disposed below the heat exchanger. And a drain pan in which dehumidified moisture is collected, and a water tank in which moisture collected in the drain pan is stored.
여기에서, 물탱크에는 만수시 작동되어 사용자가에게 경고 신호를 보내는 만수 감지장치가 설치된다.Here, the water tank is installed with a full water detection device that is operated when the water is full to send a warning signal to the user.
도 1은 종래 기술에 따른 제습기의 만수 감지장치를 나타낸 구성도이다.1 is a configuration diagram showing a full water detection device of the dehumidifier according to the prior art.
이러한 만수 감지장치는 드레인팬(106)의 하측에 배치되는 물탱크(102)와, 이 물탱크(102)로 유입되는 수량에 따라 상하방향으로 이동되는 플로트(104)와, 드레인 팬(106)에 회전 가능하게 힌지 연결되고, 일측은 플로트(104)와 연결되고 타측은 물탱크(102) 외부로 연장되어 플로트(104)의 상하 이동에 따라 회전되는 작동로드(108)와, 상기 작동로드(104)의 끝단에 눌러지는 누름 버튼(120)이 장착되고 작동로드(104)의 동작에 따라 작동로드(104)가 회전되면 누름버튼(120)이 떨어져 전기신호를 발생시키는 리미트 스위치(110)와, 상기 리미트 스위치(110)의 전기 신호가 인가되면 경고수단을 작동시켜 사용자에게 현재 물탱크가 만수상태인 것을 알리는 제어부(122)로 구성된다.The water level detecting device includes a water tank 102 disposed below the drain pan 106, a float 104 and a drain pan 106 that are moved upward and downward according to the quantity of water introduced into the water tank 102. It is rotatably hinged to one side, one side is connected to the float 104 and the other side extends outside the water tank 102 is rotated in accordance with the vertical movement of the float 104 and the operating rod ( Push button 120 that is pressed at the end of the 104 is mounted and when the operating rod 104 is rotated in accordance with the operation of the operating rod 104, the push button 120 is dropped to generate an electrical signal and the limit switch 110 When the electrical signal of the limit switch 110 is applied, it operates by the warning means to control the user 122 that the current water tank is in full water.
이러한 만수 감지장치는 물탱크(102)에 저장되는 물의 수위가 상승되면 플로트(104)가 상승되면서 작동로드(108)를 회전시키고, 이러한 과정 중 수위가 만수에 이르면 작동로드(108)가 회전되면서 누름버튼(120)에서 떨어지면서 리미트 스위치(110)가 접점되어 그때의 전기신호가 제어부(122)로 인가되고 제어부(122)는 경고수단을 작동시켜 사용자에게 현재 물탱크(102)가 만수상태인 것을 경고한다.The water level sensing device rotates the operating rod 108 as the float 104 rises when the water level of the water stored in the water tank 102 rises, and when the water level reaches full water during the process, the operating rod 108 rotates. The limit switch 110 is contacted while falling off from the push button 120, and the electric signal at that time is applied to the control unit 122, and the control unit 122 operates a warning means to present the water tank 102 to the user. To warn you.
그러나, 상기한 바와 같은 종래의 만수 감지장치는 플로트와 리미트 스위치 및 작동로드가 기구적인 작동에 의해 그 신호가 전달되기 때문에 구조가 복잡하고, 작동이 정확하지 못한 문제점이 있다.However, the conventional water level detecting device as described above has a problem that the float and the limit switch and the operating rod are complicated in structure because their signals are transmitted by mechanical operation, and the operation is not accurate.
또한, 상기한 바와 같은 만수 감지장치는 물탱크의 만수된 상태만을 단순히 감지하기 때문에 현재 수위를 감지할 수 없는 문제점이 있다.In addition, the water level detecting device as described above has a problem that can not detect the current water level because it simply detects only the full state of the water tank.
본 발명은 상기한 문제점을 해결하기 위하여 창출된 것으로서, 본 발명의 목적은 광센서의 작동에 의해 물탱크의 수량을 감지함으로써, 구조가 간단하고 정확한 수위를 감지할 수 있으며, 만수뿐 만 아니라 현재 물탱크의 수위를 정확하게 측정할 수 있는 제습기의 수위 감지장치를 제공하는 데 있다.The present invention has been created to solve the above problems, the object of the present invention by detecting the quantity of water tank by the operation of the optical sensor, the structure can detect the simple and accurate water level, as well as the current It is to provide a dehumidifier level sensor that can accurately measure the water level in the water tank.
도 1은 종래 기술에 따른 제습기의 수위 감지장치를 나타낸 구성도,1 is a block diagram showing a water level detection device of the dehumidifier according to the prior art,
도 2는 본 발명에 따른 제습기의 분해 사시도,2 is an exploded perspective view of a dehumidifier according to the present invention;
도 3은 본 발명에 따른 제습기의 수위 감지장치를 나타낸 구성도이다.Figure 3 is a block diagram showing an apparatus for detecting the water level of the dehumidifier according to the present invention.
<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>
2 : 드레인 팬 4 : 물탱크2: drain pan 4: water tank
6 : 플로트 10 : 돌기6: float 10: protrusion
12 : 가이드 격벽 16 : 고정패널12: guide bulkhead 16: fixed panel
18 : 발광부 20 : 수광부18: light emitting unit 20: light receiving unit
22 : 제어부22: control unit
상기한 과제를 실현하기 위한 본 발명에 따른 제습기의 수위 감지장치는 제습기의 물탱크로 유입되는 수위에 따라 수직으로 승강 가능하게 배치되는 플로트와, 상기 물통의 상측에 설치되어 플로트의 상하 이동에 따라 수위를 감지하는 광센서와, 상기 광센서로부터 전기신호가 인가되면 그 전기신호와 설정치를 비교하여 현재 물탱크의 수위를 판단하여 사용자에게 알려주는 제어수단을 포함하여 구성된 것을 특징으로 한다.The water level detection device of the dehumidifier according to the present invention for realizing the above object is a float arranged vertically in accordance with the water level flowing into the water tank of the dehumidifier, and installed on the upper side of the water tank in accordance with the vertical movement of the float And an optical sensor for detecting the water level, and a control means for determining the current water level of the water tank by informing the user when the electric signal is applied from the light sensor.
이하, 첨부된 도면을 참조하여 본 발명의 일실시예를 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
도 2는 본 발명에 따른 제습기의 분해 사시도이고, 도 3은 본 발명에 따른 수위 감지장치를 나타낸 구성도이다.2 is an exploded perspective view of the dehumidifier according to the present invention, Figure 3 is a block diagram showing a water level sensor according to the present invention.
제습기는 공기가 통과하면서 제습 작용을 하는 열교환기와, 실내 공기를 열교환기측으로 송풍시킴과 아울러 제습된 공기를 다시 실내로 토출시키는 송풍력을 부여하는 송풍기와, 상기 열교환기의 하측에 배치되어 열교환기에서 제습 작용된 수분이 모아지는 드레인 팬(2)과, 상기 드레인 팬(2)의 하측에 배치되어 드레인 팬(2)에 모아진 수분이 저장되고 전방패널(5)의 전방측으로 착탈 가능하게 배치되는 물탱크(4)와, 상기 물탱크의 일측에 설치되어 물탱크(4)로 유입되는 수량을 단계별로 감지하는 수위 감지장치로 구성된다.The dehumidifier has a heat exchanger that performs dehumidification as air passes, a blower that blows indoor air to the heat exchanger side, and provides a blowing force for discharging the dehumidified air back to the room, and a heat exchanger disposed below the heat exchanger. The drain pan (2) collecting moisture dehumidified in the water, and the water collected in the drain pan (2) is disposed below the drain pan (2) is stored and detachably disposed to the front side of the front panel (5) The water tank 4, and is installed on one side of the water tank is composed of a water level detection device for detecting the water flow into the water tank (4) in stages.
상기 수위 감지장치는 물탱크(4)로 유입되는 수위에 따라 수직으로 승강 가능하게 배치되는 플로트(6)와, 상기 물탱크(4)의 상측에 설치되어 플로트(4)의 상하 이동에 따라 수위를 감지하는 센싱수단과, 상기 센싱수단에서 발생된 전기신호가 인가되면 그 전기신호와 설정치를 비교하여 현재 물탱크(4)의 수위를 판단하여사용자에게 알려주는 제어수단으로 구성된다.The water level detection device is a float (6) which is arranged to be elevated vertically in accordance with the water level flowing into the water tank (4), and is installed on the upper side of the water tank (4) the water level in accordance with the vertical movement of the float (4) Sensing means for detecting the, and when the electric signal generated by the sensing means is applied to the control means for comparing the electric signal and the set value to determine the current water level of the water tank (4) to inform the user.
상기 플로트(6)는 물탱크(4)의 수위에 따라 상하 이동되도록 일정 재질로 형성되고, 그 상측에 센싱수단을 작동시키는 돌기(10)가 돌출되고, 이 플로트(6)가 수직으로 승강될 수 있도록 가이드해 주는 가이드 격벽(12)이 물탱크(4) 내부에 형성된다.The float 6 is formed of a predetermined material to move up and down according to the water level of the water tank 4, the projection 10 for operating the sensing means protrudes on the upper side, the float 6 is to be vertically elevated Guide partition wall (12) is formed in the water tank (4) for guiding the guide.
여기에서, 가이드 격벽(12)은 플로트(6)가 삽입되도록 두 개의 격벽이 일정 간격을 두고 물탱크(4) 내부에 수직으로 형성되고, 하측에는 물이 유입되는 유입구(14)가 형성된다.Here, the guide partition 12 has two partitions are vertically formed in the water tank 4 at regular intervals so that the float 6 is inserted, the inlet 14 is formed in the lower side.
센싱 수단은 일종의 광센서로서, 드레인 팬(2)의 하측면에 고정되는 고정패널(16)과, 상기 고정패널(16)의 일측에 수직으로 세워진 상태로 배치되어 일정량의 광빔을 조사하는 발광부(18)와, 이 발광부(18)와 일정 간격을 두고 대향되는 위치에 배치되어 돌기의 승강에 따라 발광부(18)로부터 조사되는 광빔량을 검출하여 그때의 전압 변화를 제어부로 인가하는 수광부(20)로 이루어진다.Sensing means is a kind of optical sensor, a fixed panel 16 fixed to the lower side of the drain pan (2), and a light emitting part arranged in a vertical position on one side of the fixed panel 16 to irradiate a certain amount of light beam (18) and a light receiving unit which is disposed at a position opposed to the light emitting unit 18 at a predetermined interval and detects the amount of light beams irradiated from the light emitting unit 18 as the projections are raised and lowered, and applies a voltage change at that time to the controller. It consists of 20.
상기 제어수단은 수광부(20)로부터 인가되는 전기신호에 따라 현재 수위를 판단하는 제어부(22)와, 상기 제어부(22)의 작동에 의해 사용자에게 현재 수위를 알려주는 알림수단(24)으로 구성된다.The control means is composed of a control unit 22 for determining the current water level according to the electrical signal applied from the light receiving unit 20, and a notification means 24 for informing the user of the current water level by the operation of the control unit 22. .
여기에서, 알림수단(24)은 제습기의 디스플레이 패널의 일측에 배치되어 사용자에게 현재의 수위를 알려줌과 아울러 만수된 경우 경고해 주는 것으로, 단계별로 설치되는 다수개의 경고 램프가 적용될 수 있고, 이외에 사용자에게 수위 및 만수를 경고할 수 있는 어떠한 알림수단도 사용될 수 있다.Here, the notification means 24 is arranged on one side of the display panel of the dehumidifier to notify the user of the current level and to warn when the water level is full, a plurality of warning lamps installed in stages can be applied, in addition to the user Any notification means can be used to warn the water level and full water.
상기한 바와 같이 이루어진 본 발명에 따른 제습기의 수위 감지장치의 작용을 다음에서 설명한다.The operation of the water level detecting device of the dehumidifier according to the present invention made as described above will be described below.
물탱크(4)에 제습된 물이 채워지면 그 수위가 증가됨에 따라 플로트(8)가 상승된다. 이때, 플로트(8)는 가이드 격벽(12)에 삽입된 상태이므로 수직으로 상승된다. 상승되는 플로트(8)가 일정 위치에 도달되면 플로트(8) 상측에 돌출된 돌기(10)가 발광부(18)와 수광부(20) 사이의 공간으로 점차적으로 삽입된다.When the water tank 4 is filled with dehumidified water, the float 8 is raised as the water level is increased. At this time, the float 8 is vertically raised because it is inserted into the guide partition 12. When the rising float 8 reaches a predetermined position, the projection 10 protruding above the float 8 is gradually inserted into the space between the light emitting portion 18 and the light receiving portion 20.
이때, 발광부(18)에서 조사되는 광빔이 돌기(10)의 상승에 따라 수광부(20)로 전달되는 광빔량이 달라지게 되고, 달라진 광빔량에 따라 제어부(22)로 전달되는 전압이 변화된다. 그러면, 제어부(22)는 수광부(20)로부터 전달되는 전압에 따라 현재 수위를 판단하여 알림수단(24)을 작동시킨다.At this time, the amount of light beams transmitted from the light emitting unit 18 to the light receiving unit 20 is changed as the projection 10 rises, and the voltage transmitted to the controller 22 is changed according to the changed amount of light beams. Then, the control unit 22 determines the current water level according to the voltage transmitted from the light receiving unit 20 to operate the notification means 24.
즉, 제어부(22)는 수위에 따라 알림수단(24)을 단계적으로 작동시켜 현재 수위를 사용자에게 알려주고, 현재 수위가 만수에 도달된 것으로 판단되면 사용자에게 현재 만수 상태임을 경고한다.That is, the controller 22 notifies the user of the current level by activating the notification means 24 in accordance with the level, and warns the user that the current level is full when the current level is reached.
따라서, 상기와 같이 구성되고 작용되는 본 발명에 따른 제습기의 수위 감지장치는 수위 변화에 따라 플로트가 상승되면 광센서에 의해 현재 수위를 감지하여 사용자에게 알려주고, 만수상태인 경우에는 사용자에게 경고하는 구조로 형성되어, 그 구조를 단순화하고, 정확한 수위 감지가 가능하며, 현재의 수위상태를 사용자가 확인할 수 있는 이점이 있다.Therefore, the water level detecting device of the dehumidifier according to the present invention configured and operated as described above detects the current water level by an optical sensor when the float rises according to the water level change, and notifies the user when the water level is full. Formed to simplify the structure, accurate water level detection is possible, there is an advantage that the user can check the current water level.
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020010034703A KR20020096310A (en) | 2001-06-19 | 2001-06-19 | water level sensing device of dehumidifier |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020010034703A KR20020096310A (en) | 2001-06-19 | 2001-06-19 | water level sensing device of dehumidifier |
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| KR20020096310A true KR20020096310A (en) | 2002-12-31 |
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| KR1020010034703A KR20020096310A (en) | 2001-06-19 | 2001-06-19 | water level sensing device of dehumidifier |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100801242B1 (en) * | 2006-06-21 | 2008-02-04 | 동양기전 주식회사 | Apparatus for controlling water level of plating bath |
| CN102996157A (en) * | 2011-09-13 | 2013-03-27 | 淮南矿业(集团)有限责任公司 | Water-level change warning device and coal mine gas extraction system |
| US20150276241A1 (en) * | 2014-03-31 | 2015-10-01 | Lg Electronics Inc. | Dehumidifier |
| KR20150113789A (en) * | 2014-03-31 | 2015-10-08 | 엘지전자 주식회사 | Dehumidifier |
| CN106322771A (en) * | 2016-08-31 | 2017-01-11 | 安徽赛福电子有限公司 | Photoelectric liquid level alarm device for water heater |
-
2001
- 2001-06-19 KR KR1020010034703A patent/KR20020096310A/en not_active Application Discontinuation
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100801242B1 (en) * | 2006-06-21 | 2008-02-04 | 동양기전 주식회사 | Apparatus for controlling water level of plating bath |
| CN102996157A (en) * | 2011-09-13 | 2013-03-27 | 淮南矿业(集团)有限责任公司 | Water-level change warning device and coal mine gas extraction system |
| US20150276241A1 (en) * | 2014-03-31 | 2015-10-01 | Lg Electronics Inc. | Dehumidifier |
| EP2927617A1 (en) * | 2014-03-31 | 2015-10-07 | LG Electronics Inc. | Dehumidifier |
| KR20150113789A (en) * | 2014-03-31 | 2015-10-08 | 엘지전자 주식회사 | Dehumidifier |
| CN106322771A (en) * | 2016-08-31 | 2017-01-11 | 安徽赛福电子有限公司 | Photoelectric liquid level alarm device for water heater |
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