KR102146906B1 - Apparatus for controlling operation point of cooling sea water centrifugal pump - Google Patents

Apparatus for controlling operation point of cooling sea water centrifugal pump Download PDF

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KR102146906B1
KR102146906B1 KR1020130140362A KR20130140362A KR102146906B1 KR 102146906 B1 KR102146906 B1 KR 102146906B1 KR 1020130140362 A KR1020130140362 A KR 1020130140362A KR 20130140362 A KR20130140362 A KR 20130140362A KR 102146906 B1 KR102146906 B1 KR 102146906B1
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South Korea
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centrifugal pump
pressure
seawater
control valve
cooling
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KR1020130140362A
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Korean (ko)
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KR20150057257A (en
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이원찬
김충식
남병탁
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대우조선해양 주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H21/00—Use of propulsion power plant or units on vessels
    • B63H21/12—Use of propulsion power plant or units on vessels the vessels being motor-driven
    • B63H21/14—Use of propulsion power plant or units on vessels the vessels being motor-driven relating to internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/04—Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves

Abstract

본 발명은 입수관(14)과 출수관(16)을 개재하여 씨체스트(10)와 냉각기(12)를 연결하고, 원심펌프(25)로 씨체스트(10)의 냉각용 해수를 냉각기(12)에 보내는 장치에 있어서: 상기 원심펌프(25)의 압력변동을 검출하도록 설치되는 압력측정기(20); 상기 출수관(16) 상에 설치되어 원심펌프(25)에 작용하는 배관압력을 조절하는 압력조절밸브(30); 및 상기 압력측정기(20)의 신호에 대응하여 압력조절밸브(30)를 설정된 조건으로 작동하는 제어기(40);를 포함하여 이루어지는 것을 특징으로 한다.
이에 따라, 냉각용 해수 펌프의 압력 변동에 따라 해수 출구 측의 조절 밸브를 조작하여 흘수와 상관없이 해수 펌프의 운전점을 일정하게 유지하고 전력사용 감소와 냉각효율 향상을 도모하는 효과가 있다.The present invention connects the sea chest 10 and the cooler 12 through the inlet pipe 14 and the outlet pipe 16, and cools the seawater for cooling the sea chest 10 with a centrifugal pump 25 to the cooler 12 In the device sent to: a pressure measuring device (20) installed to detect pressure fluctuations of the centrifugal pump (25); A pressure control valve 30 installed on the water outlet pipe 16 to control a pipe pressure acting on the centrifugal pump 25; And a controller 40 operating the pressure control valve 30 under a set condition in response to a signal from the pressure measuring device 20.
Accordingly, there is an effect of maintaining a constant operating point of the seawater pump regardless of draft by operating the control valve at the seawater outlet side according to the pressure fluctuation of the cooling seawater pump, reducing power consumption and improving cooling efficiency.

Description

냉각용 해수 원심펌프의 운전점 조절장치{Apparatus for controlling operation point of cooling sea water centrifugal pump}Apparatus for controlling operation point of cooling sea water centrifugal pump}

본 발명은 펌프의 운전점 조절장치에 관한 것으로서, 보다 구체적으로는 설정된 냉각용 해수 펌프의 입/출구 압력에 따라 해수 출구 측의 조절 밸브를 조작하여 항상 설계된 운전 포인트에서 펌프가 운전되도록 제어하는 냉각용 해수 원심펌프의 운전점 조절장치에 관한 것이다.The present invention relates to an operating point control device of a pump, and more specifically, a cooling system that controls the pump to operate at a designed operating point by operating a control valve at the seawater outlet side according to the inlet/outlet pressure of a set cooling seawater pump. It relates to an operating point control device of a centrifugal pump for dissolved water.

일반적으로 선박의 주기와 보기를 냉각한 청수는 씨체스트를 통해 유입되는 해수를 이용하여 냉각한다. 화물을 적재(선적)시와 미적재(양화 작업후 항해)시의 흘수(draft)가 달라지기 때문에 높은 곳에 위치하는 하이 씨체스트와 낮은 곳에 위치하는 로우 씨체스트 병용한다. 이때, 선박의 흘수 변화에 따라 냉각용 해수를 순환시키는 원심펌프의 운전점을 선원이 직접 조절하게 된다. In general, fresh water that has cooled the cycle and bogie of a ship is cooled using seawater flowing through the sea chest. Since the draft is different between loading (shipping) and unloading (sail after volume), the high sea chest and low sea chest are used together. At this time, the crew directly controls the operating point of the centrifugal pump that circulates the seawater for cooling according to the change of the draft of the ship.

선박의 냉각 펌프 시스템과 관련하여 한국 등록특허공보 제0725900호, 한국 등록특허공보 제1222799호 등의 선행특허를 참조할 수 있다.Regarding the cooling pump system of the ship, reference may be made to prior patents such as Korean Patent Publication No. 0725900 and Korean Registered Patent Publication No. 1222799.

전자의 선행특허는 해수를 유입하는 시퀀스펌프와; 청수냉각 계통에 설치된 바이패스 자동온도조절밸브와; 해수온도센서와 청수온도센서로부터 온도신호를 입력받아 처리하고 상기 인버터와 시퀀스펌프에 제어신호를 전달하여 인버터펌프와 시퀀스펌프의 작동을 제어하는 제어부로 구성되고, 회전수에 따른 해수 압력을 일정이상 유지하는 알고리즘을 포함한다. 이에 따라, 펌프의 회전수를 연속적으로 제어하여 엔진 냉각시스템을 경제적으로 운영하는 효과를 기대한다.The former prior patent includes a sequence pump for introducing seawater; A bypass automatic temperature control valve installed in the fresh water cooling system; It is composed of a control unit that receives and processes a temperature signal from the seawater temperature sensor and the fresh water temperature sensor and transmits a control signal to the inverter and sequence pump to control the operation of the inverter pump and the sequence pump. Includes the algorithm to maintain. Accordingly, the effect of economically operating the engine cooling system is expected by continuously controlling the rotational speed of the pump.

후자의 선행특허는 냉각 해수 이송 펌프 구동 모터의 회전수를 제어하는 인버터 장치와, 열교환기에 의해 냉각된 청수의 유량과 청수 바이패스 배관으로부터의 청수의 유량을 조정하는 청수 온도 조정밸브와, 청수 온도 조정 밸브의 하류측 청수의 수온에 의해 청수 온도 조정 밸브의 개도를 조정하는 조정 밸브제어 장치를 구비한다. 이에 따라, 간소한 구성으로 선내전력을 삭감하면서 냉각 해수 이송 펌프에 대한 회전수 제어의 빈도를 줄이는 효과를 기대한다.The latter prior patents include an inverter device that controls the rotational speed of the cooling seawater transfer pump drive motor, a fresh water temperature control valve that adjusts the flow rate of fresh water cooled by the heat exchanger and the fresh water flow rate from the fresh water bypass pipe, and fresh water temperature. It is provided with an adjustment valve control device which adjusts the opening degree of the fresh water temperature control valve by the water temperature of the downstream fresh water of an adjustment valve. Accordingly, it is expected to reduce the frequency of rotational speed control for the cooling seawater transfer pump while reducing onboard power with a simple configuration.

그러나, 상기한 선행특허에 의하면 해수 이송 펌프의 회전수 제어와 연계된 운전 경제성을 요지로 하므로 선박의 흘수 변화에 대응하여 원심펌프의 운전점을 조절해야 하는 불편을 해소하기 미흡하다.However, according to the above-described prior patent, it is insufficient to solve the inconvenience of adjusting the operating point of the centrifugal pump in response to a change in the draft of the ship, since the main point is the operational economy linked to the rotational speed control of the seawater transfer pump.

1. 한국 등록특허공보 제0725900호 "선박의 엔진냉각용 펌프의 제어시스템"(공개일자 : 2005. 6. 22.)1. Korean Patent Publication No. 0725900 "Control system of a pump for engine cooling of a ship" (Publication date: June 22, 2005) 2. 한국 등록특허공보 제1222799호 "냉각 해수 이송 펌프의 회전수 제어 장치"(공개일자 : 2010. 7. 8.)2. Korean Patent Publication No. 1222799 "Rotation speed control device for cooling seawater transfer pump" (published date: July 8, 2010)

상기와 같은 종래의 문제점들을 개선하기 위한 본 발명의 목적은, 냉각용 해수 펌프의 압력 변동에 따라 해수 출구 측의 조절 밸브를 조작하여 전력사용을 감소하고 냉각효율을 높게 유지하는 냉각용 해수 원심펌프의 운전점 조절장치를 제공하는 데 있다.An object of the present invention for improving the above-described conventional problems is a cooling seawater centrifugal pump that reduces power use and maintains high cooling efficiency by operating a control valve at the seawater outlet side according to a pressure fluctuation of the cooling seawater pump. It is to provide an operating point control device.

상기 목적을 달성하기 위하여, 본 발명은 입수관과 출수관을 개재하여 씨체스트와 냉각기를 연결하고, 원심펌프로 씨체스트의 냉각용 해수를 냉각기에 보내는 장치에 있어서: 상기 원심펌프의 압력변동을 검출하도록 설치되는 압력측정기; 상기 출수관 상에 설치되어 원심펌프에 작용하는 배관압력을 조절하는 압력조절밸브; 및 상기 압력측정기의 신호에 대응하여 압력조절밸브를 설정된 조건으로 작동하는 제어기;를 포함하여 이루어지는 것을 특징으로 한다.In order to achieve the above object, the present invention is an apparatus for connecting a sea chest and a cooler through an inlet pipe and a water outlet pipe, and sending seawater for cooling of the sea chest to a cooler by a centrifugal pump, wherein: the pressure fluctuation of the centrifugal pump A pressure meter installed to detect; A pressure control valve installed on the water outlet pipe to control a pipe pressure acting on the centrifugal pump; And a controller for operating the pressure control valve under a set condition in response to a signal from the pressure measuring device.

또, 본 발명에 따르면 상기 압력측정기는 원심펌프의 상류측과 하류측에 연결되는 차압전송기(Differential pressure transmitter)를 사용하는 것을 특징으로 한다.In addition, according to the present invention, the pressure measuring device is characterized by using a differential pressure transmitter connected to an upstream side and a downstream side of the centrifugal pump.

또, 본 발명에 따르면 상기 제어기는 원심펌프의 차압이 설정된 값으로 유지되도록 압력조절밸브의 유로단면적을 변동하는 것을 특징으로 한다.In addition, according to the present invention, the controller is characterized in that the flow path cross-sectional area of the pressure control valve is varied so that the differential pressure of the centrifugal pump is maintained at a set value.

또, 본 발명에 따르면 상기 제어기는 각각의 원심펌프에 대한 차압을 기준으로 펌핑 회전수를 독립적으로 제어하는 것을 특징으로 한다.In addition, according to the present invention, the controller is characterized in that the pumping rotational speed is independently controlled based on the differential pressure for each centrifugal pump.

이상과 같이 본 발명에 의하면, 냉각용 해수 펌프의 압력 변동에 따라 해수 출구 측의 조절 밸브를 조작하여 흘수와 상관없이 해수 펌프의 운전점을 일정하게 유지하고 전력사용 감소와 냉각효율 향상을 도모하는 효과가 있다.As described above, according to the present invention, by operating the control valve at the seawater outlet side according to the pressure fluctuation of the cooling seawater pump, the operating point of the seawater pump is kept constant regardless of the draft, and the power consumption is reduced and the cooling efficiency is improved. It works.

도 1은 본 발명에 따른 조절장치의 주요부를 나타내는 배관블록도1 is a pipe block diagram showing a main part of an adjustment device according to the present invention

이하, 첨부된 도면에 의거하여 본 발명의 실시예를 상세하게 설명하면 다음과 같다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

본 발명은 입수관(14)과 출수관(16)을 개재하여 씨체스트(10)와 냉각기(12)를 연결하고, 원심펌프(25)로 씨체스트(10)의 냉각용 해수를 냉각기(12)에 보내는 장치에 관하여 제안한다. 씨체스트(10)는 선박의 흘수(draft)에 대응하도록 높은 곳에 위치하는 하이 씨체스트와 낮은 곳에 위치하는 로우 씨체스트로 구성된다. 냉각기(12)는 선박의 주기와 보기를 냉각한 청수를 해수로 냉각시키는 열교환기 구조이다. 씨체스트(10)와 냉각기(12)는 입수관(14)과 출수관(16)으로 배관연결되고, 입수관(14) 상에 해수 이송을 위한 원심펌프(25)가 설치된다. 입수관(14)과 출수관(16)은 냉각기(12)를 기준으로 설정된다.The present invention connects the sea chest 10 and the cooler 12 through the inlet pipe 14 and the outlet pipe 16, and cools the seawater for cooling the sea chest 10 with a centrifugal pump 25 to the cooler 12 Suggest about sending device to ). The sea chest 10 is composed of a high sea chest positioned at a high place and a low sea chest positioned at a low place to correspond to the draft of the ship. The cooler 12 is a heat exchanger structure that cools fresh water that has cooled the cycle and bogie of the ship with sea water. The sea chest 10 and the cooler 12 are pipe-connected to the inlet pipe 14 and the outlet pipe 16, and a centrifugal pump 25 for transporting seawater is installed on the inlet pipe 14. The inlet pipe 14 and the outlet pipe 16 are set based on the cooler 12.

이때, 원심펌프(25)는 항상 양정-유량(H-Q) 곡선과 시스템 커브(System curve)가 만나는 운전점에서 운전된다. 시스템 커브는 실양정(Actual head 또는 Static head), 압력수두(Pressure head), 배관자재(밸브, 관이음 등)에서 발생하는 손실수두(Friction loss)의 합으로 나타내는 곡선이다. At this time, the centrifugal pump 25 is always operated at an operating point where the head-flow rate (H-Q) curve and the system curve meet. The system curve is a curve expressed by the sum of the friction losses occurring in the actual head (actual head or static head), pressure head, and piping materials (valve, pipe joint, etc.).

본 발명에 따르면 상기 원심펌프(25)의 압력변동을 검출하도록 압력측정기(20)가 설치된다. 선박의 흘수 변화는 원심펌프(25)의 압력변동에 의한 운전점 변동을 유발한다. 흘수가 높아질 때 하이 씨체스트(10)를 통하여 해수가 공급되고, 반대로 흘수가 낮아지면 로우 씨체스트(10)를 통하여 해수가 공급된다. 이 과정에서 압력측정기(20)로 검출되는 원심펌프(25)의 압력변동 신호는 원심펌프(25)의 운전점 유지를 위하여 활용된다.According to the present invention, a pressure measuring device 20 is installed to detect pressure fluctuations in the centrifugal pump 25. The change in draft of the ship causes a change in the operating point due to the change in pressure of the centrifugal pump 25. When the draft increases, sea water is supplied through the high sea chest 10, and when the draft decreases, sea water is supplied through the low sea chest 10. In this process, the pressure fluctuation signal of the centrifugal pump 25 detected by the pressure measuring device 20 is utilized to maintain the operating point of the centrifugal pump 25.

본 발명의 세부 구성에 의하면, 상기 압력측정기(20)는 원심펌프(25)의 상류측과 하류측에 연결되는 차압전송기(Differential pressure transmitter)를 사용하는 것을 특징으로 한다. 압력측정기(20)인 차압전송기의 고압포트는 원심펌프(25)의 상류측에 저압포트는 원심펌프(25)의 하류측에 연결한다. 물론 복수의 원심펌프(25)가 설치된 경우 각각에 동일한 방식으로 차압전송기를 설치하는 것이 좋다.According to the detailed configuration of the present invention, the pressure measuring device 20 is characterized by using a differential pressure transmitter connected to an upstream side and a downstream side of the centrifugal pump 25. The high pressure port of the differential pressure transmitter, which is the pressure measuring device 20, is connected to the upstream side of the centrifugal pump 25, and the low pressure port is connected to the downstream side of the centrifugal pump 25. Of course, when a plurality of centrifugal pumps 25 are installed, it is preferable to install the differential pressure transmitter in the same manner for each.

또, 본 발명에 따르면 상기 출수관(16) 상에 압력조절밸브(30)가 설치되어 원심펌프(25)에 작용하는 배관압력을 조절한다. 압력조절밸브(30)는 후술하는 제어기(40)의 전기적 신호로 작동되는 방식을 택한다. 압력조절밸브(30)의 설치 위치는 출수관(16) 상에서 배출구(18)와 인접한 위치로 선정한다.In addition, according to the present invention, a pressure control valve 30 is installed on the water outlet pipe 16 to regulate the pipe pressure acting on the centrifugal pump 25. The pressure control valve 30 is operated by an electric signal from the controller 40 to be described later. The installation position of the pressure control valve 30 is selected as a position adjacent to the outlet 18 on the water outlet pipe 16.

또, 본 발명에 따르면 제어기(40)가 상기 압력측정기(20)의 신호에 대응하여 압력조절밸브(30)를 설정된 조건으로 작동한다. 제어기(40)는 씨체스트(10)에서 냉각기(12)에 이르는 경로 상에서 작업자의 접근이 용이한 지역에 설치한다. 제어기(40)는 구성의 간편성을 위해 릴레이 회로나 PLC로 구성할 수도 있지만, 원격통신으로 정보교환이 가능하도록 마이콤 회로로 구성하는 것이 좋다.In addition, according to the present invention, the controller 40 operates the pressure control valve 30 under a set condition in response to a signal from the pressure measuring device 20. The controller 40 is installed on a path from the sea chest 10 to the cooler 12 in an area where the operator can easily access. The controller 40 may be configured with a relay circuit or a PLC for simplicity of configuration, but it is preferable to configure the controller 40 with a microcomputer circuit to enable information exchange through remote communication.

본 발명의 세부 구성에 의하면, 상기 제어기(40)는 원심펌프(25)의 차압이 설정된 값으로 유지되도록 압력조절밸브(30)의 유로단면적을 변동하는 것을 특징으로 한다. 압력조절밸브(30)의 유로단면적이 축소되면 원심펌프(25)의 차압을 증가시킬 수 있고 유로단면적이 확대되면 원심펌프(25)의 차압을 감소시킬 수 있다. 원심펌프(25)의 차압을 설정 범위로 유지하면 흘수에 상관 없이 일정한 운전점의 유지가 가능하다. 이에 따라, 냉각기(12)의 수에 무관하게 원심펌프(25)의 냉각 효율이 높게 유지되면서 전력 사용량이 감소한다.According to the detailed configuration of the present invention, the controller 40 is characterized in that the flow path cross-sectional area of the pressure control valve 30 is changed so that the differential pressure of the centrifugal pump 25 is maintained at a set value. When the flow path cross-sectional area of the pressure control valve 30 is reduced, the differential pressure of the centrifugal pump 25 can be increased, and when the flow cross-sectional area is enlarged, the differential pressure of the centrifugal pump 25 can be reduced. If the differential pressure of the centrifugal pump 25 is maintained within a set range, a constant operating point can be maintained regardless of the draft. Accordingly, the cooling efficiency of the centrifugal pump 25 is maintained high regardless of the number of coolers 12, and the power consumption is reduced.

본 발명의 세부 구성에 의하면, 상기 제어기(40)는 각각의 원심펌프(25)에 대한 차압을 기준으로 펌핑 회전수를 독립적으로 제어하는 것을 특징으로 한다. 복수의 원심펌프(25)가 동일한 규격으로 설치되는 경우에도 노후 정도차, 구동모터 이상 등의 원인으로 차압이 동일하지 않게 나타날 수 있다. 이 경우 해당 원심펌프(25)에 대한 회전수를 증감시켜 운전점을 유지한다.According to the detailed configuration of the present invention, the controller 40 is characterized in that the pumping rotation speed is independently controlled based on the differential pressure for each centrifugal pump 25. Even when a plurality of centrifugal pumps 25 are installed with the same standard, the differential pressure may not be the same due to a difference in aging accuracy or an abnormality in the drive motor. In this case, the operating point is maintained by increasing or decreasing the number of revolutions for the centrifugal pump 25.

이와 같은 방식에 의하면 청수 냉각용 해수를 이송하기 위한 원심펌프(25)의 운전점을 선원이 직접 조절하는 불편을 해소할 수 있다.According to this method, the inconvenience of directly controlling the operating point of the centrifugal pump 25 for transporting seawater for cooling fresh water can be eliminated.

본 발명은 기재된 실시예에 한정되는 것은 아니고, 본 발명의 사상 및 범위를 벗어나지 않고 다양하게 수정 및 변형할 수 있음은 이 기술의 분야에서 통상의 지식을 가진 자에게 자명하다. 따라서 그러한 변형예 또는 수정예들은 본 발명의 특허청구범위에 속한다 해야 할 것이다.The present invention is not limited to the described embodiments, and it is obvious to those of ordinary skill in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such variations or modifications will have to belong to the claims of the present invention.

10: 씨체스트 12: 냉각기
14: 입수관 16: 출수관
18: 배출구 20: 압력측정기
25: 원심펌프 30: 압력조절밸브
40: 제어기10: sea chest 12: cooler
14: inlet pipe 16: outlet pipe
18: outlet 20: pressure gauge
25: centrifugal pump 30: pressure control valve
40: controller

Claims (4)

입수관(14)과 출수관(16)을 개재하여 씨체스트(10)와 냉각기(12)를 연결하고, 복수의 원심펌프(25)로 씨체스트(10)의 냉각용 해수를 냉각기(12)에 보내는 장치에 있어서:
상기 원심펌프(25)의 압력변동을 검출하도록 설치되는 압력측정기(20);
상기 출수관(16) 상에 설치되어 원심펌프(25)에 작용하는 배관압력을 조절하는 압력조절밸브(30); 및
상기 압력측정기(20)의 신호에 대응하여 압력조절밸브(30)를 설정된 조건으로 작동하는 제어기(40);를 포함하여 이루어지되,
상기 압력측정기(20)는 각각의 원심펌프(25)의 상류측과 하류측에 연결되는 차압전송기(Differential pressure transmitter)를 사용하고,
상기 제어기(40)는 원심펌프(25)의 차압이 설정된 값으로 유지되도록 압력조절밸브(30)의 유로단면적을 변동하며,
상기 제어기(40)는 각각의 원심펌프(25)에 대한 차압을 기준으로 펌핑 회전수를 독립적으로 제어하고,
상기 제어기(40)는 흘수가 높아지면 하이 씨체스트(10)를 통하여 해수가 공급되고 흘수가 낮아지면 로우 씨체스트(10)를 통하여 해수가 공급되는 상황에 대응하여 원심펌프(25)의 차압을 설정 범위로 유지하도록 제어하여 흘수에 상관 없이 일정한 운전점을 유지하는 것을 특징으로 하는 냉각용 해수 원심펌프의 운전점 조절장치.The seawater for cooling the seawater of the seachest 10 is connected to the sea chest 10 and the cooler 12 through the inlet pipe 14 and the water outlet pipe 16, and the cooler 12 In the sending device to:
A pressure measuring device 20 installed to detect pressure fluctuations of the centrifugal pump 25;
A pressure control valve 30 installed on the water outlet pipe 16 to control a pipe pressure acting on the centrifugal pump 25; And
Including; a controller 40 for operating the pressure control valve 30 under a set condition in response to the signal of the pressure measuring device 20,
The pressure measuring device 20 uses a differential pressure transmitter connected to the upstream side and the downstream side of each centrifugal pump 25,
The controller 40 changes the flow path cross-sectional area of the pressure control valve 30 so that the differential pressure of the centrifugal pump 25 is maintained at a set value,
The controller 40 independently controls the pumping rotational speed based on the differential pressure for each centrifugal pump 25,
The controller 40 adjusts the differential pressure of the centrifugal pump 25 in response to a situation in which seawater is supplied through the high sea chest 10 when the draft is increased and the seawater is supplied through the low sea chest 10 when the draft is lowered. An operating point control device of a seawater centrifugal pump for cooling, characterized in that it maintains a constant operating point irrespective of a draft by controlling to maintain it within a set range. 삭제delete 삭제delete 삭제delete
KR1020130140362A 2013-11-19 2013-11-19 Apparatus for controlling operation point of cooling sea water centrifugal pump KR102146906B1 (en)

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JP2010254281A (en) * 2008-12-01 2010-11-11 Yukio Ota Engine cooling device of ship
JP2013151256A (en) * 2012-01-26 2013-08-08 Shin Kurushima Dockyard Co Ltd Cooling water system for ship

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JP4859874B2 (en) 2008-05-12 2012-01-25 三菱重工業株式会社 Rotational speed control device for cooling seawater transfer pump

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Publication number Priority date Publication date Assignee Title
JP2010254281A (en) * 2008-12-01 2010-11-11 Yukio Ota Engine cooling device of ship
JP2013151256A (en) * 2012-01-26 2013-08-08 Shin Kurushima Dockyard Co Ltd Cooling water system for ship

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