KR20000061572A - A apparatus for water level sensing of washing machine - Google Patents

A apparatus for water level sensing of washing machine Download PDF

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Publication number
KR20000061572A
KR20000061572A KR1019990010689A KR19990010689A KR20000061572A KR 20000061572 A KR20000061572 A KR 20000061572A KR 1019990010689 A KR1019990010689 A KR 1019990010689A KR 19990010689 A KR19990010689 A KR 19990010689A KR 20000061572 A KR20000061572 A KR 20000061572A
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KR
South Korea
Prior art keywords
water
washing
water level
pressure sensor
pressure
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KR1019990010689A
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Korean (ko)
Inventor
김학실
Original Assignee
윤종용
삼성전자 주식회사
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Application filed by 윤종용, 삼성전자 주식회사 filed Critical 윤종용
Priority to KR1019990010689A priority Critical patent/KR20000061572A/en
Publication of KR20000061572A publication Critical patent/KR20000061572A/en

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/087—Water level measuring or regulating devices
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/12—Casings; Tubs
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

PURPOSE: A water level sensor of a washing machine is provided to enable a pressure sensor to act by directly receiving the water pressure of washing water, to simplify a structure by eliminating an air chamber and to avoid a damage to the pressure sensor. CONSTITUTION: Washing water is supplied in a washing tub(20). While the washing water is supplied on the floor of the washing tub, a water pressure is increased. The water pressure gradually pressurizes a central horizontal face(22a) of a flexible member(22). The horizontal face pressurizes a pressure sensor(24) while generating a lower part sagging force due to a rubber characteristic. Herein, the pressure sensor acts according to the water pressure and inputs a signal to a microcomputer. The microcomputer controls the washing water amount by sending a signal to a water supplier based on the data.

Description

세탁기의 수위감지장치{A APPARATUS FOR WATER LEVEL SENSING OF WASHING MACHINE}Water level detection device of washing machine {A APPARATUS FOR WATER LEVEL SENSING OF WASHING MACHINE}

본 발명은 세탁기의 수위감지장치에 관한 것으로서, 더욱 상세하게는 세탁조내의 세탁수(물)의 수압이 압력센서에 직접 전달되게 하여 수위를 감지할 수 있도록 한 세탁기의 수위감지장치에 관한 것이다.The present invention relates to a water level detection device for a washing machine, and more particularly, to a water level detection device for a washing machine so that the water pressure of the washing water (water) in the washing tank is directly transmitted to the pressure sensor.

종래에 의한 세탁기의 수위감지장치는, 도1 및 도2에 도시한 바와 같이 세탁조(1)의 외주면 일측 하단에서부터 일정높이로 일정면적의 공간을 가지며 또한 이 공간의 하단 일측과 세탁조(1)의 하단 일측이 서로 연결되는 통로(3)가 형성된 에어챔버(5)가 설치되고, 상기 에어챔버(5)의 측벽에 대하여 상기 통로(3)와 대각방향으로 대응되는 상단위치에 에어유출구(7)가 설치되며, 상기 에어유출구(7)의 끝단에 상기 에어챔버(5)내에 압축된 공기압에 의해 동작되면서 그 신호를 도시하지 않은 마이콤에 입력시키는 압력센서(9)가 설치되어 있다.The water level detection device of the conventional washing machine has a space of a predetermined area from a lower end of one outer circumferential surface of the washing tub 1 to a predetermined height as shown in FIGS. An air chamber 5 having a passage 3 having one end connected to each other is provided, and an air outlet 7 at an upper position corresponding to the sidewall of the air chamber 5 in a diagonal direction with respect to the side wall of the air chamber 5. The pressure sensor 9 is provided at the end of the air outlet 7 to be operated by the compressed air pressure in the air chamber 5 and to input the signal to a microcomputer (not shown).

이와 같이 구성된 종래에 의한 세탁기의 수위감지장치는, 세탁조(1)내에 세탁수가 급수되면 이 세탁수의 일부가 세탁조(1)의 둘레측 하부에 형성된 통로(3)를 통하여 에어챔버(5)내에 유입되면서 에어챔버(5)내의 공기를 압축하게 되고, 이 에어챔버(5)내에서 압축된 공기는 에어챔버(5)의 상단측 에어유출구(7)에 설치된 압력센서(9)에 전달된다.In the conventional water level detecting device of the washing machine configured as described above, when the wash water is supplied into the washing tank 1, a part of the washing water is introduced into the air chamber 5 through the passage 3 formed in the lower portion of the circumferential side of the washing tank 1. As it flows in, the air in the air chamber 5 is compressed, and the air compressed in the air chamber 5 is transmitted to the pressure sensor 9 installed at the upper air outlet 7 of the air chamber 5.

이때, 압력센서(9)는 공기압을 감지하여 그 신호를 도시하지 않은 마이콤에 입력시키게 되고, 이 마이콤은 그 데이타에 근거하여 급수수단에 신호를 보내어 세탁수의 급수량을 제어하게 된다.At this time, the pressure sensor 9 detects the air pressure and inputs the signal to a microcomputer (not shown). The microcomputer sends a signal to the water supply means based on the data to control the amount of washing water.

그러나, 이와 같이 구성된 종래에 의한 세탁기의 수위감지장치는, 압력센서(9)가 에어챔버(5)내의 압축성 매체인 공기압을 전달받아 동작되기 때문에 에어챔버(5)내의 부피변화 및 공기밀도의 변화에 따른 오차가 심한 문제점이 있었다. 또한 에어챔버(5)를 이용하여 압력센서(9)를 설치하여야 하므로, 구조가 복잡하게 되고 제조코스트가 상승된다는 문제점도 있었다.However, the conventional water level sensor of the washing machine configured as described above has a volume change and a change in air density in the air chamber 5 because the pressure sensor 9 is operated by receiving air pressure which is a compressive medium in the air chamber 5. There was a serious problem with the error. In addition, since the pressure sensor 9 must be installed using the air chamber 5, there is a problem in that the structure becomes complicated and the manufacturing cost is increased.

또한, 세탁조(1)의 외주 하단 일측에 에어챔버(5)가 설치되고, 이 에어챔버(5)의 측면에 압력센서(9)가 설치되는 구조로 되어 있기 때문에 세탁조(1)가 좌우로 심하게 진동할 경우 압력센서(9)가 세탁기의 내측벽에 부딪쳐 파손될 염려가 있다는 문제점도 있었다.In addition, since the air chamber 5 is installed on the outer peripheral lower end side of the washing tank 1, and the pressure sensor 9 is installed on the side of the air chamber 5, the washing tank 1 is severely left and right. When vibrating, the pressure sensor 9 also hits the inner wall of the washing machine, which may cause damage.

따라서, 본 발명은 상기 문제점을 해결하기 위하여 안출된 것으로서, 본 발명의 목적은 압력센서가 비압축성 매체인 세탁수의 수압을 직접 전달받아 동작되게 함은 물론, 에어챔버를 없애어 구조를 단순화시키고, 또 압력센서가 피물체와 충돌되어 파손되는 염려를 없앨 수 있는 세탁기의 수위감지장치를 제공하는데 있다.Therefore, the present invention has been made to solve the above problems, an object of the present invention is to simplify the structure by removing the air chamber, as well as allowing the pressure sensor to be directly received by the hydraulic pressure of the wash water is an incompressible medium, Another object of the present invention is to provide a water level detection device for a washing machine, which can eliminate the possibility of a pressure sensor colliding with an object.

도1은 종래에 의한 수위감지장치가 취부된 세탁기를 도시한 단면도,1 is a cross-sectional view showing a washing machine in which a water level sensor according to the related art is mounted;

도2는 종래에 의한 수위감지장치를 도시한 상세도,2 is a detailed view showing a water level detecting device according to the prior art;

도3은 본 발명에 의한 수위감지장치가 취부된 세탁기를 도시한 단면도,3 is a cross-sectional view showing a washing machine equipped with a water level sensor according to the present invention;

도4는 본 발명에 의한 수위감지장치를 도시한 분해 사시도,4 is an exploded perspective view showing a water level sensor according to the present invention;

도5는 본 발명에 의한 수위감지장치의 작동되기전 상태를 도시한 단면도,5 is a cross-sectional view showing a state before the operation of the water level sensor according to the present invention;

도6은 본 발명에 의한 수위감지장치의 작동후 상태를 도시한 단면도이다.6 is a cross-sectional view showing a state after the operation of the water level sensor according to the present invention.

* 도면의 주요부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

A : 수위감지수단 20 : 세탁조A: water level detection means 20: washing tank

20a : 홀 20b : 리브20a: hole 20b: rib

22 : 신축부재 22a : 수평면22: elastic member 22a: horizontal plane

22b : 절곡부 22c : 플랜지부22b: bend portion 22c: flange portion

24 : 압력센서 26 : 브라켓24: pressure sensor 26: bracket

상기 목적을 달성하기 위하여 이루어진 본 발명에 의한 세탁기의 수위감지장치는, 세탁조내의 급수량을 감지하는 압력센서를 구비한 세탁기의 수위감지장치에 있어서, 상기 압력센서는, 상기 세탁조내의 세탁수의 수압을 직접 전달받아 동작되도록 세탁조의 바닥에 취부된 것을 특징으로 한다.Water level detection device of the washing machine according to the present invention made to achieve the above object, in the water level detection device of the washing machine having a pressure sensor for sensing the water supply amount in the washing tank, the pressure sensor, the pressure of the washing water in the washing tank It is characterized in that it is mounted on the bottom of the washing tank to be directly received and operated.

또한, 본 발명에 의한 세탁기의 수위감지장치는, 세탁조내의 급수량을 감지하는 수위감지수단을 구비한 세탁기에 있어서, 상기 수위감지수단은, 상기 세탁조의 바닥면 일측에 관통된 홀과, 상기 홀을 긴밀하게 밀봉하며 세탁조내의 수압에 따라 신축변형되는 신축부재와, 상기 신축부재의 하부에 장착되어 신축부재의 처짐력에 의한 압력을 전달받아 동작되는 압력센서로 구성된 것을 특징으로 한다.In addition, the water level detection device of the washing machine according to the present invention, in the washing machine provided with a water level sensing means for sensing the amount of water in the washing tank, the water level sensing means, the hole penetrated to one side of the bottom surface of the washing tank, the hole It is characterized in that the tightly sealed and the elastic member is deformed in accordance with the water pressure in the washing tank, and the pressure sensor is mounted to the lower portion of the elastic member is operated by receiving the pressure by the deflection force of the elastic member.

이하, 본 발명의 일실시예에 관하여 첨부 도면 도3 내지 도6을 참조하면서 상세히 설명한다.Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 3 to 6.

본 발명에 의한 수위감지수단(A)은, 도3 및 도4에 도시한 바와 같이 세탁조(20)의 바닥면 일측에 관통된 홀(20a)과, 상기 홀(20a)을 긴밀하게 밀봉하는 신축부재(22)와, 상기 세탁조(20)의 바닥 외측에서 상기 신축부재(22)의 저면 중앙에 장착되는 압력센서(24)와, 상기 신축부재(22)와 압력센서(24)를 상기 세탁조(20)의 바닥 외측면에 고정시키는 브라켓(26)으로 구성되어 있다.Water level detecting means (A) according to the present invention, as shown in Figs. 3 and 4, the hole 20a penetrated to one side of the bottom surface of the washing tub 20, and the expansion and contraction to tightly seal the hole (20a) The member 22, the pressure sensor 24 mounted to the center of the bottom surface of the elastic member 22 on the bottom outside of the washing tank 20, the elastic member 22 and the pressure sensor 24 to the washing tank ( It is comprised by the bracket 26 fixed to the bottom outer surface of 20).

즉, 상기 홀(20a)의 가장자리에 대하여 하부방향에는, 상기 신축부재(22)의 가장자리와 요철형상으로 형상맞춤되도록 리브(20b)가 일체로 돌설되어 있다.That is, the rib 20b is integrally protruded in the lower direction with respect to the edge of the hole 20a so as to conform to the edge of the elastic member 22 in an uneven shape.

상기 신축부재(22)는, 연성의 고무재질로 이루어져 있고, 그 중앙에는 상기 홀(20a)속으로 삽입되어 세탁조(20)의 바닥 내측면 높이와 동일한 수평상태를 유지하도록 수평면(22a)이 형성되고, 상기 수평면(22a)의 가장자리는 상기 리브(20b)에 대응되게 형상맞춤되도록 하부방향으로 절곡부(22b)가 형성되며, 상기 절곡부(22b)의 가장자리는 상기 브라켓(26)이 세탁조(20)의 바닥 외측면에 결합될때 그 사이에 개재되어 압착 고정되도록 수평방향으로 뻗은 플랜지부(22c)가 형성되어 있다.The stretchable member 22 is made of a soft rubber material, and a horizontal surface 22a is formed at the center thereof so as to be inserted into the hole 20a to maintain the same horizontal state as the bottom inner surface height of the washing tub 20. The bent portion 22b is formed in the lower direction so that the edge of the horizontal surface 22a is shaped to correspond to the rib 20b, and the edge of the bent portion 22b is the bracket 26 with the washing tank ( When coupled to the bottom outer surface of the 20), the flange portion 22c extending in the horizontal direction is formed to be interposed therebetween and crimp fixedly formed.

상기 브라켓(26)은, 상기 세탁조(20)로부터 착탈이 용이하도록 그 상단 가장자리가 복수의 체결나사(28)에 의해 세탁조(20)의 바닥 외측면에 결합되어 있다.The bracket 26, the upper edge is coupled to the bottom outer surface of the washing tank 20 by a plurality of fastening screws 28 so that attachment and detachment from the washing tank 20.

다음은, 이와 같이 구성된 본 발명의 작용 및 효과를 설명한다.Next, the operation and effect of the present invention configured as described above will be described.

세탁조(20)내에 세탁수가 급수되면, 이 세탁수는 세탁조(20)의 바닥에 급수되는 동안 점차적으로 수위가 높아지면서 수압이 높아지게 되고, 이 수압은 세탁조(20)의 바닥 일측에 장착된 신축부재(22)의 중앙측 수평면(22a)을 서서히 가압하게 되며, 이 수평면(22a)은 도6에 도시한 바와 같이 그 재질인 고무특성에 따라 하부 처짐력이 발생되면서 수평면(22a)의 하부에 위치한 압력센서(24)를 가압시킨다.When the wash water is supplied to the washing tank 20, the washing water is gradually increased in water level while being supplied to the bottom of the washing tank 20, and the water pressure is increased. The center side horizontal surface 22a of 22 is gradually pressed, and this horizontal surface 22a is located in the lower portion of the horizontal surface 22a while the lower deflection force is generated according to the rubber characteristic thereof as shown in FIG. Pressurize the pressure sensor 24.

이때, 압력센서(24)는 상기 신축부재(22)의 수평면(22a)을 통해 가해지는 수압에 따라 동작하면서 그 신호를 도시하지 않은 마이콤에 입력시키게 되고, 이 마이콤은 그 데이타에 근거하여 급수수단에 신호를 보내어 세탁수의 급수량을 제어하게 된다.At this time, the pressure sensor 24 operates according to the water pressure applied through the horizontal plane 22a of the expansion and contraction member 22, and inputs the signal to a microcomputer (not shown). A signal is sent to control the water supply of the wash water.

여기서, 압력센서(24)에 의한 세탁수의 급수량 측정은 압력센서(24)의 압축력에 따른 변화량을 미리 설정된 세탁수의 수압에 의한 압축력 프로세스에 의해 산출함으로써 급수량을 측정한다.Here, the water supply amount measurement of the wash water by the pressure sensor 24 measures the water supply amount by calculating the amount of change according to the compression force of the pressure sensor 24 by the compression force process by the water pressure of the washing water set in advance.

따라서, 압력센서(24)는 세탁조(20)내의 비압축성 매체인 세탁수의 수압을 직접 전달받아 동작하게 되므로, 종래와 같이 에어챔버를 통해 압축성 매체인 공기를 압축하여 압력을 전달하는 방식보다 압력(수압)을 정확히 감지할 수 있다.Therefore, since the pressure sensor 24 is operated by directly receiving the water pressure of the washing water, which is an incompressible medium in the washing tank 20, the pressure sensor 24 compresses the air, which is a compressive medium, through the air chamber as in the prior art. Water pressure) can be detected accurately.

한편, 세탁조(20)내의 세탁수가 외부로 배수되면, 신축부재(22)와 압력센서(24)에 가해졌던 수압이 해제되면서 신축부재(22)와 압력센서(24)가 원래상태로 복귀된다.On the other hand, when the wash water in the washing tub 20 is drained to the outside, the water pressure applied to the elastic member 22 and the pressure sensor 24 is released while the elastic member 22 and the pressure sensor 24 is returned to its original state.

이상 설명한 바와 같이, 본 발명에 의한 세탁기의 수위감지장치에 의하면, 압력센서가 세탁조내의 비압축성 매체인 세탁수의 수압을 직접 전달받아 동작하도록 세탁조의 바닥 일측에 설치되는 구조로 되어 있기 때문에 종래와 같이 에어챔버를 통해 압축성 매체인 공기를 압축하여 압력을 전달하는 방식보다 압력(수압)을 정확히 감지할 수 있을 뿐만 아니라, 구조를 단순화시킬 수 있다.As described above, according to the water level detection device of the washing machine according to the present invention, since the pressure sensor is configured to be installed on one side of the bottom of the washing tank so as to operate by directly receiving the water pressure of the washing water which is an incompressible medium in the washing tank. The air chamber not only accurately detects the pressure (hydraulic pressure) but also simplifies the structure than compressing the air, which is a compressible medium, to transmit pressure.

또, 압력센서가 세탁조의 바닥에 설치되므로, 세탁조가 좌우로 심하게 진동하여 세탁기의 내측벽에 부딪치더라도 파손되는 염려가 없다.In addition, since the pressure sensor is installed at the bottom of the washing tub, there is no fear that the washing tub will vibrate violently from side to side and hit against the inner wall of the washing machine.

Claims (4)

세탁조내의 급수량을 감지하는 압력센서를 구비한 세탁기의 수위감지장치에 있어서,In the water level detection device of the washing machine having a pressure sensor for sensing the water supply in the washing tank, 상기 압력센서(24)는, 상기 세탁조(20)내의 세탁수의 수압을 직접 전달받아 동작되도록 세탁조(20)의 바닥에 취부된 것을 특징으로 하는 세탁기의 수위감지장치.The pressure sensor 24, the water level detection device of the washing machine, characterized in that attached to the bottom of the washing tank 20 to operate by receiving the water pressure of the washing water in the washing tank 20 directly. 세탁조내의 급수량을 감지하는 수위감지수단을 구비한 세탁기에 있어서,In the washing machine provided with a water level detecting means for detecting the water supply amount in the washing tank, 상기 수위감지수단(A)은,The water level detecting means (A), 상기 세탁조(20)의 바닥면 일측에 관통된 홀(20a)과,A hole 20a penetrated at one side of the bottom surface of the washing tub 20, 상기 홀(20a)을 긴밀하게 밀봉하며 세탁조(20)내의 수압에 따라 신축변형되는 신축부재(22)와,An elastic member 22 which tightly seals the hole 20a and expands and contracts according to water pressure in the washing tank 20; 상기 신축부재(22)의 하부에 장착되어 신축부재(22)의 처짐력에 의한 압력을 전달받아 동작되는 압력센서(24)로 구성된 것을 특징으로 하는 세탁기의 수위감지장치.The water level detection device of the washing machine, characterized in that the pressure sensor 24 is mounted to the lower portion of the elastic member 22 is operated by receiving the pressure by the deflection force of the elastic member (22). 제2항에 있어서,The method of claim 2, 상기 신축부재(22)는, 그 재질이 고무로 이루어진 것을 특징으로 하는 세탁기의 수위감지장치.The stretchable member 22, the water level detecting device of the washing machine, characterized in that the material is made of rubber. 제2항에 있어서,The method of claim 2, 상기 신축부재(22)와 압력센서(24)는, 상기 세탁조(20)의 바닥 외측면에 장착되는 브라켓(26)에 의해 고정된 것을 특징으로 하는 세탁기의 수위감지장치.The stretchable member (22) and the pressure sensor (24), the water level detection device of the washing machine, characterized in that fixed by a bracket (26) mounted on the bottom outer surface of the washing tank (20).
KR1019990010689A 1999-03-27 1999-03-27 A apparatus for water level sensing of washing machine KR20000061572A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100425124B1 (en) * 2001-12-18 2004-03-30 엘지전자 주식회사 structure for mounting water-level sensor in drum-type washing machine
US7194909B2 (en) 2004-05-21 2007-03-27 Samsung Electronics Co., Ltd. Pressure and vibration sensing apparatus
CN108221285A (en) * 2018-03-13 2018-06-29 青岛海尔洗衣机有限公司 A kind of valve plug and washing machine equipped with liquid level sensor
CN109505101A (en) * 2017-09-14 2019-03-22 青岛海尔洗衣机有限公司 A kind of draining valve plug and washing machine
CN109811514A (en) * 2017-11-21 2019-05-28 青岛海尔洗衣机有限公司 A kind of washing facility
JP2020533079A (en) * 2017-09-08 2020-11-19 青島海爾洗衣机有限公司ＱｉｎｇＤａｏ Ｈａｉｅｒ Ｗａｓｈｉｎｇ Ｍａｃｈｉｎｅ Ｃｏ．，Ｌｔｄ． Washing machine drainage control method and washing machine
CN113654618A (en) * 2021-09-22 2021-11-16 中船黄埔文冲船舶有限公司 Installation structure of cabin bottom liquid level sensor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100425124B1 (en) * 2001-12-18 2004-03-30 엘지전자 주식회사 structure for mounting water-level sensor in drum-type washing machine
US7194909B2 (en) 2004-05-21 2007-03-27 Samsung Electronics Co., Ltd. Pressure and vibration sensing apparatus
JP2020533079A (en) * 2017-09-08 2020-11-19 青島海爾洗衣机有限公司ＱｉｎｇＤａｏ Ｈａｉｅｒ Ｗａｓｈｉｎｇ Ｍａｃｈｉｎｅ Ｃｏ．，Ｌｔｄ． Washing machine drainage control method and washing machine
JP7146904B2 (en) 2017-09-08 2022-10-04 青島海爾洗衣机有限公司 Washing machine drainage control method and washing machine
CN109505101A (en) * 2017-09-14 2019-03-22 青岛海尔洗衣机有限公司 A kind of draining valve plug and washing machine
CN109505101B (en) * 2017-09-14 2022-09-27 青岛海尔洗衣机有限公司 Drainage valve plug and washing machine
CN109811514A (en) * 2017-11-21 2019-05-28 青岛海尔洗衣机有限公司 A kind of washing facility
CN108221285A (en) * 2018-03-13 2018-06-29 青岛海尔洗衣机有限公司 A kind of valve plug and washing machine equipped with liquid level sensor
CN113654618A (en) * 2021-09-22 2021-11-16 中船黄埔文冲船舶有限公司 Installation structure of cabin bottom liquid level sensor

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