Application of Vortex Flow Meter in Water Cooling System

Abstract: The application information of vortex flowmeter in water cooling system is provided by excellent flowmeter and flowmeter manufacturers. 1 Introduction The walking beam heating furnace of the High-speed Line Plant adopts the structure of four static beams and five moving beams, and the beams are cooled by circulating water cooling method. Therefore, the normal flow of cooling water is one of the key elements to ensure that the nine beams are not burned down. Not necessarily with water pressure. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the application article details of vortex flowmeters in water cooling systems. 1 Introduction The walking beam heating furnace of the High-speed Line Plant adopts the structure of four static beams and five moving beams, and the beams are cooled by circulating water cooling method. Therefore, the normal flow of cooling water is one of the key elements to ensure that the nine beams are not burned down. Water pressure may not necessarily have water flow. This is the author's personal experience in a company's investigation and study. The water cooling circulation system of the walking beam heating furnace in the bar factory affiliated to the company mainly adopts the pressure indication detection. Later, due to the blockage of the pipeline, the secondary instrument has a pressure indication, but there is no actual flow, resulting in serious consequences of the furnace body collapsing. To this end, the high-speed line plant adopts the detection method mainly based on the detection of water flow in the water cooling circulation system, and a SINIER vortex flowmeter is installed in the cooling water main pipe and nine beams respectively. SINIER vortex flowmeter has the characteristics of stable instrument constant, easy to ensure accuracy in harsh environments, large range, wide range of measured media (gas, liquid, steam), small pressure loss, high precision, and low maintenance. It is widely used in various production equipment. In addition, it is hardly affected by parameters such as flow rate, density, pressure, temperature, viscosity, etc. when measuring volume flow. Below, the author will describe a series of problems that occur during the operation of this type of instrument in daily work and the methods to deal with them. 2 Composition and function The vortex flowmeter instrument consists of the following six parts: transmitter shell: vortex generator body: signal detection body: output amplifier: pulse shaper: input amplifier. The transmitter housing is a part of the fluid pipeline. The appropriate diameter, shape and size ratio of the vortex generator are selected by the stem. When the fluid flows in the housing, a stable vortex signal can be generated in a wide range of Reynolds numbers. . The vortex generator generates vortex trains when the fluid flows, and the signal detector detects the vortex trains and converts them into pulse signals. The input amplifier amplifies the weak electrical signal and filters out the interference signal. A pulse shaper converts irregular electrical pulses into square wave signals of constant amplitude and width. The output amplifier amplifies the square wave signal and converts it into a 4-20mA DC current signal output, and outputs a square wave pulse signal (used for supply flow accumulation). 3 Working principle Vortex flowmeter is a flowmeter made of the body vibration phenomenon of Karman vortex generated when the fluid is around a bluff object. This kind of flowmeter gives a pulse frequency signal proportional to the flow rate only, and has nothing to do with the temperature, pressure, composition, viscosity and density of the fluid. That is, F=S, _I-4d/(D)ld'1—4 BinrwuDJ_, d where jF is the vortex frequency jv is the average flow velocity in the pipeline jd is the width of the column body onward flow iD is the inner diameter of the pipeline jS is the Strauhar number. When the vortex is generated on both sides of the cylinder, the cylinder is acted by an alternating lift force perpendicular to the flow direction, and the change frequency of the lift force is the vortex frequency. The change of the lift force is detected by the piezoelectric element embedded in the cylinder, and it is converted into a frequency signal and sent to the amplifier, which is amplified and shaped by the amplifier to obtain a square wave signal whose frequency is proportional to the flow rate. The circuit block diagram is shown in Figure 1. Show. It can be seen from the above formula that the flow velocity u can be calculated by measuring the vortex street frequency, and then the flow rate can be obtained from the pipe diameter and flow velocity. Figure 2 is a schematic diagram of vortex generation. 4. Debugging of the flowmeter When there is no liquid flow in the pipeline, the receiver counts abnormally due to the noise generated by the vibration of the pipeline. At this time, the sensitivity of the meter should be adjusted. 41 Adjustment of Amplifier Gain Generally, there is no need to adjust the amplifier gain, unless the amplifier gain is adjusted through the AMP potentiometer on the amplifier board A after the sensor is replaced. 42 Adjust the correct wiring for zero point, input a signal with zero amplitude to the vortex flowmeter through the low frequency signal generator, and adjust the zero point adjustment potentiometer. The display value of the digital multimeter should be 4mA. 43 Full-scale adjustment If you do not know the full-scale frequency of the instrument, you can calculate the full-scale frequency 5 through the maximum flow rate. , to adjust the meter. Its relational formula is five. . =KQmax, the value of the constant rush number l-J-instrument calibration. Correct wiring, use the signal generator to output the signal to the charge amplifier, increase the amplitude of the input signal, convert the output square wave, and change the output frequency of the signal generator until the value displayed on the frequency meter is the full scale calculated by the above formula. frequency. At this time, the fixed frequency remains unchanged and the range potentiometer is adjusted until the indicated value of the digital multimeter is 20mA. 5 Practical application 5.1 Installation In order to ensure the measurement accuracy, there should be a necessary long straight pipe section before and after the installation position of the vortex flowmeter. If there is a reducing resistance member on the upstream side, there should be a straight pipe section with a length of 15D. If there is an elbow on the same plane, a straight pipe section with a length of 20D should be required. The length of the straight pipe section on the downstream side should be more than 5D. The vortex flowmeter can be installed in horizontal, vertical or other positions, but if it is installed vertically when measuring liquid, the liquid should flow from bottom to top to ensure that the pipeline is always full of liquid.

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