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[Keywords] ship ballast; system valve; drive unit; water system In recent years, due to the in-depth development of intelligent technology and automation technology, the ship industry has gradually increased the requirements for valve drive devices for ship ballast water systems, which in turn prompted The valve unit has been continuously improved and optimized from a single manual device to an electric device, a manual device, a pneumatic device, a hydraulic device and an electro-hydraulic device. Since the application functions and application ranges of the various valve driving devices are different, the overall effect of the ship's ballast water system can be ensured only by selecting a reasonable valve driving device according to the actual needs of the ship's ballast water system. Therefore, in order to effectively guarantee the use effect of the valve driving device of the ship ballast water system, it is necessary to reasonably analyze the type of the valve driving device of the ship ballast water system, so that the superior function of the valve driving device can be fully exerted.
I. Overview of the valve drive device of the ship ballast water system (I) Introduction to the valve drive device of the ship ballast water system The valve drive device of the ship ballast water system mainly uses the external power to start and close the valve device, so that the valve operation Automated control and operation are achieved to increase the efficiency and effectiveness of valve drive control. According to the classification of the output shaft movement mode of the valve drive device of the ship ballast water system used at the present stage, the valve drive device can be divided into multi-turn rotary type, partial rotary type and linear reciprocating type. When the valve drive device is selected for operation, According to the requirements of the output shaft movement mode of the ship's ballast water system and the actual operation requirements, the situation that the ship's ballast water system and the valve drive device are not applicable is prevented.
(II) Development history of valve drive device for ship ballast water system The valve drive device used in traditional ship ballast water system is mostly a single manual device. This valve drive device not only consumes more material, manpower and capital. The accuracy and timeliness of valve control is also difficult to guarantee, resulting in the development of valve drives in the direction of automation. After long-term research and development and improvement, electric devices, pneumatic devices, gas-liquid linkage devices and electro-hydraulic linkage devices based on automation technology are gradually applied to ship ballast water systems. These valves combined with automation technology The driving device has a significant improvement in safety and stability compared with the conventional manual device mode, and optimizes the performance of the ship ballast water system to a certain extent, thus prompting these technologies to replace the traditional manual device mode has become the current The main application of valve pressure devices for ship ballast water systems.
Second, the type of valve drive device for ship ballast water system (1) Manual device Manual device is the basic type of ship ballast water system, and its device is mainly used by regulating valve box. The assembly of multiple valve groups can be operated in accordance with the operation of the ship's ballast water system under human-driven operation. The overall structure of the manual device is very simple, the operation is relatively easy to control, and it can be applied to various small ship ballast water systems. However, if it is used in a ship with more ballast tanks, the length of the pipeline needs to be increased. Therefore, it is rarely suitable for use in large ship ballast water systems. In recent years, along with the demand for automation control and intelligent control, the manual valve drive method has become more and more difficult to meet the needs of the ship's ballast water system, which has led to its gradual withdrawal from the valve drive of the ship's ballast water system. Device application type.
(2) Electric device The electric device is a valve driving device that relies on electric power to close and adjust the valve. Compared with the manual device, the electric device has the advantages of quick start, fast closing, high controllability, simple operation, and can be used for DC, AC, and Short-wave, pulse and other signals are effectively collected to meet the control requirements of the ship's ballast water system. Although the electric device has many advantages in use, it is operated by the electric device with electric power as the driving energy, resulting in the mechanization efficiency of the electric device being about 30-60%, and at the same time, it is easy to appear due to the influence of the power supply voltage and frequency. The ballast water system assists in situations where operating stability is low. Under normal circumstances, the electric device is not suitable for the ship's ballasting environment with severe humidity. In practice, dry electric devices should be used as much as possible. When using in explosion-proof applications, explosion-proof electric devices should be selected as much as possible.
(3) Pneumatic devices The ship is basically equipped with a compressed air system. When the pneumatic ballast system is used for the ship's ballast water system, the air source can be obtained through the compressed air system. The medium of the pneumatic device is low-pressure compressed air, and the pressure is generally lower than 0.8 MPa. The gas source can be directly discharged into the atmosphere without any pollution to the atmospheric environment. When the pneumatic device is actually applied to the ship's ballast water system, the control speed of the valve is relatively high. If it is applied to small and medium-sized ships, the speed control valve should be installed for speed adjustment control. Since the gas used in the pneumatic device can be compressed, the ballast water system of the ship can be buffered during the process of closing the starting device, which is very beneficial to the safety of the ship ballast water system.
(4) Hydraulic device The hydraulic device is divided into two types: hydraulic steel execution structure and hydraulic motor execution structure. The hydraulic steel execution structure is used for reciprocating linear motion, and the hydraulic motor execution structure is used for rotary motion. The hydraulic device has a dense structure, relatively small volume, high stability and reliability during driving, and can be applied to ship ballast water systems with large diameter and high fluid pressure. When using the hydraulic device for the ship ballast water system, the corresponding hydraulic pump station should be configured, and the distance between the hydraulic pump and the hydraulic device should be strictly regulated to avoid leakage of the pipeline and cause a large environmental pollution accident.
(5) The electro-hydraulic device of the electro-hydraulic device combines the technical advantages of the hydraulic device and the electric device. The driving force is relatively large, the driving reaction time is also short, and the ship ballast water system can be quickly matched to perform corresponding operations. The electro-hydraulic device adopts a pump-controlled hydraulic cylinder method, and the device is composed of an electric shock, a hydraulic pump, a fuel tank, a safety protection module, a hydraulic execution module and a valve position indicating module, and the hydraulic pump is directly mounted on the hydraulic driving device. The independence between the electro-hydraulic devices is relatively strong, which can effectively improve the operating efficiency and stability of the ship's ballast water system.
III. Conclusion In summary, the valve drive device is the basic component of the ship's ballast water system. The rationality and level of the valve drive device directly affect the operational safety of the ship's ballast water system. Once the valve drive device and the ship The ballast water system is not suitable, which will inevitably reduce the operational stability and safety of the ship's ballast water system. Due to the continuous use of valve drive devices for ship ballast water systems at this stage, the traditional manual control mode has been gradually replaced. When using the valve drive device to assist the ship ballast water system, it is necessary to strictly control the valve drive device. The quality of the ship's ballast water system is also selected according to the type and characteristics of the ship's ballast water system to ensure the accuracy of the valve control of the ship's ballast water system.
ã€references】
[1]Lu Haijin. Li Xiaochen. Status quo of valve drive device for ship ballast water system [J]. Heilongjiang Science and Technology Information, 2015, (24): 16-18.
[2] Yang Shuhui. Zhou Lingyun. Structural design of automatic door control system drive device [J]. Science and Technology Plaza, 2016, (2): 52-55.
[3] 蔡ç´.Fan Wei.Design of Electric Propulsion Drives for Ships[J].Ship Science and Technology,2016,(8):13-17.
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Analysis of valve drive device for ship ballast water system
ã€Abstract】With the rapid development of China's science and technology, the development level of China's shipbuilding industry is getting higher and higher, and the functions and types of valve drive devices used in ship ballast water systems are also increasing. The ship's ballast water system mainly adjusts the floating state during the operation of the ship through the method of filling or discharging the ballast water tanks in different parts, and the valve driving device is equipped with the operation of the ship's ballast water system to carry out long distance and fast. Accurate pipe valve control to enable stable operation of the ship's operating system. To further ensure the use of the valve drive device of the ship's ballast water system, it is necessary to effectively study the type of valve drive device to properly apply the valve drive device to the ship's ballast water system.