⎝⎛星力捕鱼⎞⎠

⎝⎛星力捕鱼⎞⎠ page Company Profile ⎝⎛星力捕鱼⎞⎠ Product center Quality system marketing network After sales service Recruitment contact us
Flow meter series
Temperature instrument series
Pressure instrument series
Calibration instrument series
Level instrument series
Digital display instrument series
Transmitter instrument series
Wire and cable series
Bridge instrument cabinet series
Pipe fitting valve series

Address: Xiongyi, Jinhe Road, Jinhu County, Jiangsu Province
Lunan
Phone: 0517-86900901
0517-86900921
0517-86900920
Fax: 0517-86900902
Postcode: 211600
http://zzyfwh.com
Email: chinadongxiang@163.com
Industry Information
Turbine flowmeter guarantees ideal accuracy and normal service life
2012-4-11 11:30:46

,该流量计是我公司经过多年的实践和实验设计出来的一款全新、全升级的产品,该涡轮流量计主要由涡轮、轴承、前置放大器、显示仪表组成。 Jiangsu Jinhu Dongxiang Instrument Co., Ltd. specializes in the production of turbine flowmeters . This flowmeter is a new and fully upgraded product designed by our company after years of practice and experiment. The turbine flowmeter is mainly composed of turbines, bearings and front Amplifier, display instrument composition. The measured fluid impacts the turbine blades, causing the turbine to rotate, and the rotation speed of the turbine changes with the change in flow rate, that is, the flow rate is large, and the rotation speed of the turbine is also large. After the preamplifier is amplified, it is sent to the display instrument for counting and display. The instantaneous flow rate and accumulated flow rate can be obtained according to the number of pulses and the accumulated pulse number in a unit time. The working principle of the turbine transmitter is that when the fluid flows along the axis of the pipeline and impacts the turbine blades, a force proportional to the product of the flow rate qv, the velocity V and the fluid density ρ acts on the blades, pushing the turbine to rotate. While the turbine is rotating, the blade periodically cuts the magnetic lines of force generated by the electromagnet, changing the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating potential signal will be induced in the coil, and the frequency of this pulsating signal is proportional to the flow rate of the measured fluid. The pulse signal output by the turbine transmitter is amplified by the pre-amplifier and sent to the display instrument to realize the flow measurement. Normal selection method of turbine flowmeter: 1. It is best to use 316 stainless steel to prevent corrosion on the flowmeter body. If it is an explosion-proof area, it must also be the result of explosion-proof. 2. Bearings generally have three specifications of tungsten carbide, polytetrafluoroethylene, and carbon graphite: tungsten carbide has the highest accuracy, and it is used as a standard part for industrial control; polytetrafluoroethylene and carbon graphite can be anticorrosive, and it is generally preferred in chemical sites. The life of the bearing is proportional to the inverse square of the flow rate, so the best flow rate is better than 1/3 of the maximum flow rate. 3. The inductive probe detects the motion of the rotating body and converts it into a pulsed digital electrical signal. Its electromagnetic coil voltage output value is close to a sine curve. The frequency range of the pulsed signal changes linearly with the measured flow rate. The typical range is 10: Three sizes: 1, 25: 1 and 100: 1. The resistance of the electromagnetic coil is generally less than 2000Ω, and greater than this value may be damaged.

The correct installation method of turbine flowmeter: 1. The power line of the transmitter adopts metal shielded wire, and the grounding must be good and reliable. The power source is DC 24V, 650Ω impedance. 2. The transmitter should be installed horizontally, avoid vertical installation, and ensure that there are adaptable straight pipe sections before and after, generally the first 10D, the last 5D. 3. Ensure that the flow direction of the fluid is consistent with the direction of the arrow on the instrument case, and it must not be installed in the opposite direction. 4. The measured medium must not corrode the turbine, especially at the bearing, otherwise measures should be taken. Turbine flowmeters require installation piping (the installation of the flowmeter has a great impact on the accuracy of the flowmeter measurement) 1. Uneven flow velocity distribution and the existence of secondary flow in the tube are important factors affecting the accuracy of the turbine flowmeter measurement. Therefore, the turbine flowmeter has certain requirements for the upstream and downstream straight pipe sections. For industrial measurements, straight pipe lengths of 20D upstream and 5D downstream are generally required. In order to eliminate the secondary flow, it is better to install a rectifier at the upstream end. If the upstream end can guarantee a straight pipe section of about 20D, and a rectifier is installed, the measurement accuracy of the flow meter can reach the accuracy level of calibration. 2. Turbine flowmeters have higher requirements for the cleanliness of fluids. Filters must be installed in front of the flowmeters to ensure the cleanness of the fluids. The filter can be a funnel type, and its cleanliness can be obtained by measuring the difference in pressure between the two ends. 3. In order to ensure that the liquid passing through the flowmeter is single-phase, that is, air or vapor cannot be allowed to enter the flowmeter, an aerator should be installed upstream of the flowmeter if necessary. For liquids that are easily gasified, a certain back pressure must be guaranteed downstream of the flow meter. The magnitude of this back pressure can be twice the pressure drop of the flow sensor at the maximum flow rate and 1.2 times the vapor pressure of the liquid at the maximum temperature.

以及防爆型的产品,我公司技术人员对于防爆型涡轮流量计在安装过程中设定了一系列的要求: 为了仪表安全正常使用,应复核防爆型流量计的使用环境是否与用户防爆要求规定相符,且安装使用涡街流量计过程中,应严格遵守国家防爆型产品使用要求,用户不得自行更改防爆系统的连接方式,不得随意打开仪表。 Jiangsu Jinhu Dongxiang Instrument Co., Ltd. specializes in the production of turbine flowmeters and explosion-proof products. Our company's technical staff has set a series of requirements for the installation of explosion-proof turbine flowmeters. Whether the use environment of the type flowmeter is consistent with the user's explosion-proof requirements, and during the installation and use of the vortex flowmeter, the national explosion-proof product use requirements should be strictly observed. The user must not change the connection method of the explosion-proof system by himself or open the instrument at will. The selection is within the specified flow range to prevent overspeed operation to ensure that the desired accuracy is obtained and the normal service life is guaranteed. Before installing the turbine flowmeter, clean up the debris in the pipeline: debris, welding slag, stones, dust, etc. It is recommended to install a 5 micron mesh filter upstream to block droplets and sand. When the flowmeter is put into operation, the front valve should be opened slowly and then the rear valve should be opened to prevent the instantaneous airflow from damaging the turbine. Lubrication should be performed according to the notice board. The frequency of refueling depends on the cleanliness of the temperament, usually 2-3 times a year. Turbine overspeed due to pressure test, purge pipe, or exhaust, and turbine running in reverse flow may damage the flowmeter. When the flowmeter is running, it is not allowed to open the front and rear covers at will and change the relevant internal parameters, otherwise it will affect the normal operation of the flowmeter. Carefully install the gasket to ensure that no protrusions enter the pipe to prevent interference with normal flow measurements. When the flowmeter is calibrated, the pressure should be collected on the flowmeter pressure take-off port.

所组成的部分其实各个厂家都是大同小异的,基本上结构相同,但是每家有每家的特点,用到的产品材料也是不一样的,涡轮流量计由涡轮、轴承、前置放大器、显示仪表组成。 The components of the turbine flowmeter produced by our company are actually very similar to each other and basically have the same structure, but each has its own characteristics and the materials used are different. The turbine flowmeter consists of a turbine and a bearing. , Preamp, display instrument. The measured fluid impacts the turbine blades, causing the turbine to rotate, and the rotation speed of the turbine changes with the change in flow rate, that is, the flow rate is large, and the rotation speed of the turbine is also large. After the preamplifier is amplified, it is sent to the display instrument for counting and display. The instantaneous flow rate and accumulated flow rate can be obtained according to the number of pulses and the accumulated pulse number in a unit time. The working principle of the turbine transmitter is that when the fluid flows along the axis of the pipeline and impacts the turbine blades, a force proportional to the product of the flow rate qv, the velocity V and the fluid density ρ acts on the blades, pushing the turbine to rotate. While the turbine is rotating, the blade periodically cuts the magnetic lines of force generated by the electromagnet, changing the magnetic flux of the coil. According to the principle of electromagnetic induction, a pulsating potential signal will be induced in the coil, and the frequency of this pulsating signal is proportional to the flow rate of the measured fluid.