Disclosed are a control unit, a circulation system, and a method for handling ballast water of one or more ballast tanks. The circulation system comprising: a control unit; a pipe structure having a first system inlet and a first system outlet; and a pump unit for pumping ballast water between the first system inlet and the first system outlet, wherein the pump unit is connected to the control unit. The control unit is configured to: obtain a volume parameter indicative of pumped volume; determine if a pump criterion is fulfilled, wherein the pump criterion is based on the volume parameter; and operate the pump unit based on whether the pump criterion is fulfilled or not.

Ballast water circulation system, control unit, and related method

The invention discloses a speed regulation water pump, which comprises a pump body, and the speed regulation water pump also comprises a cutterhead, a motor, a detector, a controller and a frequency converter, an output shaft of the motor is connected with an impeller shaft of the pump body, the cutterhead is arranged on the shaft of the pump body and on an inlet of the pump body, the detector is arranged between the cutterhead and an impeller and used for measuring fluid pressure between the cutterhead and the impeller, the detector and the frequency converter are connected with the controller, and the frequency converter is electrically connected with the motor. The motor and the water pump are conjoined, the cutterhead is arranged on the water inlet of the water pump so as to cut impurities entering the impeller, and the fluid pressure between the cutterhead and the impeller is detected, if the negative pressure is too large, the controller controls the frequency converter to reduce the rotation speed of the motor, and otherwise the controller controls the frequency converter to increase the rotation speed of the motor; and the automatic running of the speed regulation water pump is realized, the speed of the water pump is manually regulated and controlled, and the application cost is saved.

Speed regulation water pump

A ballast water treatment apparatus 1 comprises a ballast pipe 11 which guides ballast water to a ballast tank 60 and a sterilizing agent supply unit 30 which supplies a constant amount of a sterilizing agent per unit time to the ballast pipe 11 in accordance with a flow rate of ballast water flowing in the ballast pipe 11. A ballast water treatment method using the ballast water treatment apparatus 1 comprises steps of supplying ballast water to a ballast tank 60 via a ballast pipe 11 and supplying a constant amount of a sterilizing agent 33 per unit time to the ballast pipe 11 in accordance with a flow rate of the ballast water flowing in the ballast pipe 11.

Ballast water treatment apparatus and ballast water treatment method

밸러스트수 처리 장치 (1) 는, 밸러스트 탱크 (60) 에 밸러스트수를 유도하는 밸러스트 배관 (11) 과, 상기 밸러스트 배관 (11) 을 흐르는 밸러스트수의 유량에 따라 단위 시간당 일정량의 살균제를 밸러스트 배관 (11) 에 공급하는 살균제 공급 수단 (30) 을 구비하고 있다. 밸러스트수 처리 장치 (1) 를 사용한 밸러스트수 처리 방법은, 밸러스트 배관 (11) 으로부터 밸러스트 탱크 (60) 에 밸러스트수를 공급하는 공정과, 상기 밸러스트 배관 (11) 에, 밸러스트 배관 (11) 을 흐르는 밸러스트수의 유량에 따라 단위 시간당 일정량의 살균제 (33) 를 공급하는 공정을 포함한다.

밸러스트수 처리 장치 및 밸러스트수 처리 방법

The invention belongs to the technical field of fluid transmission and control, and particularly discloses a device for testing a flow field and cavitation of an ultra-high-speed and low-specific-speed impeller pump. The device comprises a rectangular test stand installation base, a supporting base is arranged at the top of the test stand installation base, a shell is arranged at the top of the supporting base, a hydraulic flow channel is formed in the shell, the shell is formed by an annular shell body and a rectangular shell body, an impeller pump installation cavity is formed in the center of the annular shell body, the hydraulic flow channel communicated with the inside of the impeller pump installation cavity is formed in the rectangular shell body, the other end of the hydraulic flow channel is provided with an external load installation hole communicated with the inside of the hydraulic flow channel, and both the annular shell body and the rectangular shell body are provided with a plurality of through holes communicated with the inside of the hydraulic flow channel. The device can accurately measure the distribution situation of the flow field of impeller pump and complete measuring of the flow field and the cavitation performance of the ultra-high-speed impeller pump.

Device for testing flow field and cavitation of impeller pump

The flow rate of a pump, which is installed in a small space, is measured with good accuracy. A pump equipped with a flow rate measurement function comprises: a pump which has a first pressure outlet located on the downstream side of a suction-side flange and which also has a second pressure outlet located on the upstream side of a discharge-side flange; first and second pressure sensors respectively disposed at the first and second pressure outlets; a memory section which previously stores flow rate characteristics representing the relationship between a flow rate and the difference between the pressures detected by the first and second pressure sensors; a calculation section which calculates the difference between the pressures obtained from the first and second pressure sensors; and a computation section which computes a flow rate from the calculated difference and from the flow rate characteristics.

Pump equipped with flow rate measurement function, and ballast water treatment device using same

PROBLEM TO BE SOLVED: To measure pump flow arranged in a narrow space, with high accuracy.SOLUTION: The pump with flow measurement functions includes: a pump having a first pressure outlet formed on the downstream side of an intake-side flange and a second pressure outlet formed on the upstream side of a discharge-side flange; first and second pressure sensors arranged in the first and second pressure outlets, respectively; a memory part for storing in advance flow characteristics showing the relationship between the difference in detected pressures between the first and second pressure sensors and the flow; a calculation part for calculating a difference between the pressures actually obtained by the first and second pressure sensors; and a computing part for computing the flow on the basis of the difference and the flow characteristics.

Hirao Kazunobu

Papers

Pump equipped with flow rate measurement function, and ballast water treatment device using same

Pump with flow measurement function, and ballast water treatment device using the same