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technical article
Plastic tube float flowmeter promotes the intelligence of primary electrical appliances through functional reuse
2012-3-31 14:58:07


的主要测量元件为一根小端向下,大端向上垂直安装的锥形塑料管及其在内可以上下移动的浮子。 The main measuring element of the plastic tube float flow meter is a conical plastic tube with a small end facing downward and a large end facing upward, and a float that can move up and down inside. When the fluid flows through the conical plastic tube from bottom to top, a pressure difference is generated between the upper and lower parts of the float, and the float rises under the action of this differential pressure. When the force that causes the float to rise is equal to the combined forces of gravity, buoyancy, and viscous force, the float is in an equilibrium position. Therefore, there is a certain proportional relationship between the flow rate of the fluid flowing through the flowmeter and the rising height of the float, that is, the flow area of the flowmeter. The position height of the float can be used as a flow measurement.
Installation [1] Before installation, the foam support in the instrument should be gently removed with tool nose pliers, and then reinstalled. When installing, pay attention to whether the rubber gasket is installed in the groove of the connection pipe. Leak-proof. [2] The interface of the flowmeter can be matched with ABS plastic pipe, or PVC plastic pipe, and connected with special glue, or it can be connected by plastic method, and then connected to the metal flange. [3] The flowmeter must be installed vertically, without obvious tilt, and its installation height should be convenient for reading the float. When reading, the line of sight and the float should be horizontal. [General standard: The optimal flow rate required is 50% -70% of the maximum flow rate of the flow meter. Try not to use the highest number. [4] At the upstream and downstream of the meter, the inlet and outlet of the meter should ensure a straight pipe section with 5 times the meter diameter. [5] The pressure of the bedding fluid must be stable. If the fluid is too unstable, it will cause the float to fluctuate and cannot be measured correctly. A buffer or a setter should be set upstream of the flowmeter. 应垂直安装,流量计中心线与铅垂线的夹角不应超过5度。 [6] The plastic tube float flowmeter should be installed vertically, and the angle between the centerline of the flowmeter and the plumb line should not exceed 5 degrees.
[1] When using the meter, it is necessary to slowly open the upstream valve to full open, and then use the regulating valve downstream of the flow meter to adjust the flow. When the meter is out of use, close the upstream valve slowly, and then close the flow regulating valve downstream of the meter. [2] The indication value of the meter is seen in the middle of the score line, and the indication value is read from the scale of the float according to the height of the float. 〔3〕 When the cone and float are contaminated, they should be cleaned in time. [4] Regularly check the flowmeter for errors. Once it exceeds the specified error, the float and cone should be replaced or recalibrated to obtain better accuracy. [5] When the measured fluid is inconsistent with the calibration medium of the flowmeter, the displayed value must be corrected. The emergence of electronic transformers has been hailed as a revolution in the manufacturing of high-voltage electrical appliances in the early 2000s. Its digital output and networked wiring make the power grid safer, more environmentally friendly, and more conducive to the intelligence of the primary equipment and even the entire transmission and distribution system. Compared with traditional transformers, electronic transformers have the following characteristics: small signal transmission instead of high power output, miniaturization and low power of transformers can reduce the weight of tens of kilograms or even tons to a few kilograms. Optically isolated plastic tube float flowmeter replaces oil and gas insulation. Independent high-voltage transformers use optical fiber digital connections once and twice. Optical isolation replaces complex and expensive oil and gas insulation systems. This is a revolutionary change. The higher the voltage, the higher the cost-effectiveness of the transformer. Digital output replaces analog output, which is convenient for subsequent network connection and intelligent processing. It adopts optical fiber transmission and has stronger ability to resist electromagnetic interference. Network data sharing replaces multi-winding parallel wiring. Single-point measurement data of electronic transformers can be transmitted via Industrial Ethernet, so they are shared, and a large number of parallel cables can be omitted at the power station. According to statistics, there are currently hundreds of units in China that are engaged in tentative research and development of new electronic transformers. About 10 companies have initially formed supply capacity, and the categories are relatively complete. Currently, there are 3 to 5 . The products involve different varieties such as 10 ~ 800 kV, current, voltage, free-standing type and combined electrical type. Since 2004, active electronic transformers have entered the market before optical transformers. The high-voltage side of active electronic transformers converts current signals into digital signals and transmits them to ground potential through optical fibers. Like optical sensing solutions, Optical isolation between high and low voltages, coupled with industrial mass production, has become the dominant type of transformer. During the same period, China developed a more practical "self-excitation source" technology, which has actively transformed into a "quasi-passive" structure. This solution greatly simplifies the transformer and fundamentally improves reliability and life cycle.

Soon, a kind of "equal-potential cavity" partial pressure structure suitable for electronic low-power partial pressure appeared in China. It has high insulation safety plastic tube float flow meter and measurement accuracy index, so it can replace the traditional oil and gas reliance. Insulated transformer. This technology is particularly suitable for the dry type of high-voltage and ultra-high-voltage voltage divider structures. It is a new type of electronic voltage transformer that has grown out of China. In order to overcome the measurement performance susceptible to temperature and vibration stress, the optical solution has been improved from a ring magneto-optical glass to a fiber-optic sensor, making the optical solution a new technical platform, closer to the practical requirements. There are already a few trials of this type of fiber-optic electronic transformers, which need to further overcome the problems of complex structure and high cost. 组合电器、隔离刀等组合电器中,减少占地,降低造价,还可以通过功能复用促进一次电器本身的小型化和智能化。 Combined structure: Utilizing the advantages of electronic micropower and miniaturization, the transformers are combined in components as transformers, fully-enclosed plastic tube float flowmeter combination appliances, isolation knives and other combination appliances to reduce land occupation and cost. Through the reuse of functions, the miniaturization and intelligence of the primary electrical appliances themselves are promoted. Various schemes will be combined with each other while taking advantage of each other. In addition to various independent and closed current-voltage combination transformers, LPCT / ROG-CT and optics are expected to appear in the next few years. Combination version of current transformer. LZB-() S plastic tube float meter cone and other main parts are made of AS, ABS plastic, have good corrosion resistance, the product also has a reasonable structure, small size, light weight, cone tube is not easy to break, etc. Features, plastic tube rotor flowmeter can be widely used in chemical, environmental protection, food and other industrial sectors.