The application of the frequency converter in the circulating water pump, especially the centrifugal pump, is widely used in various industries, and the power consumption of the pump is high, which is very important for power saving. The traditional operation mode of the water pump is that the rotation speed is constant, and the valve flow return valve is used to adjust the flow rate, thus causing a large amount of energy waste. If the frequency conversion speed regulation is adopted, the electric energy (depending on the specific working condition) can be saved, and The frequency conversion speed regulation has high efficiency and wide speed regulation range. It is especially suitable for working conditions at low speed for a long time. It can also be soft-started to reduce the impact on the power grid. It is easy to operate and saves effort. Because the speed is reduced, the noise is reduced, the wear is reduced, and the life is reduced. The length of maintenance is also reduced, and in addition, the flow rate can be controlled more accurately and quickly according to the requirements of the production process. The principle of energy saving for circulating water pump speed regulation The constant water pressure can be determined by adjusting the speed of the water pump.
According to the similar theory of fluid mechanics, the performance of the pump impeller at a certain rated speed can be converted into its performance at other speeds. The basis of the pump impeller similarity law is geometric similarity and motion similarity. Under the premise of geometric similarity, the similarity of motion is similar in working conditions. According to the similar law of the impeller, the flow head power and speed of the two pumps under similar working conditions can be derived. In practical applications, the speed control pump operates in the high efficiency zone, and the speed difference is not large. It can be approximated that the three local efficiencies are unchanged. In this way, the flow rate Q of the centrifugal water pump can be proportional to the rotational speed of the centrifugal pump. The squared proportional power of the motor is proportional to the product of Q and is proportional to the cube of the rotational speed. If conventional throttle adjustment is used, the speed remains the same and the valve opening is reduced. At this time, the pipe network resistance increased. At this time, when the decrease was made, the lift did not change much, and most of them increased slightly. In addition, as the flow rate Q decreases, the efficiency of the water pump also decreases.
Ethernet cables connect devices such as PCs, routers, and switches within a local area network.Most technicians refer to these standards as CAT5 and CAT6, respectively. Also CAT3 available. Because of this, many online stores that sell network cables use this abbreviated language as well.
The connector can by shield or non-shield type, raw cable can be UTP, STP, FTP type. Also the molded shape can be custom mould by straight, right-angle, 105 degree, etc.
These physical cables are limited by length and durability. If a network cable is too long or of poor quality, it won't carry a good network signal. These limits are one reason there are different types of Ethernet cables that are optimized to perform certain tasks in specific situations.
Ethernet Cable Wiring,RJ45 cable,networking cable,8P8C cable
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