Flow meter
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+086-0517-86998608Flow meter
一、产品原理1、 Product principle天然气流量传感器的流通剖面类似文丘利管的型线。在入口侧安放一组螺旋型导流叶片,当流体进入流量传感器时,导流叶片迫使流体产生剧烈的旋涡流。当流体进入扩散段时,旋涡流受到回流的作用,开始作二次旋转,形成陀螺式的涡流进动现象。该进动频率与流量大小成正比,不受流体物理性质和密度的影响,检测元件测得流体二次旋转进动频率就能在较宽的流量范围内获得良好的线性度。信号经前置放大器放大、滤波、整形转换为与流速成正比的脉冲信号,然后再与温度、压力等检测信号一起被送···
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一、产品原理
1、 Product principle
天然气流量传感器的流通剖面类似文丘利管的型线。在入口侧安放一组螺旋型导流叶片,当流体进入流量传感器时,导流叶片迫使流体产生剧烈的旋涡流。当流体进入扩散段时,旋涡流受到回流的作用,开始作二次旋转,形成陀螺式的涡流进动现象。该进动频率与流量大小成正比,不受流体物理性质和密度的影响,检测元件测得流体二次旋转进动频率就能在较宽的流量范围内获得良好的线性度。信号经前置放大器放大、滤波、整形转换为与流速成正比的脉冲信号,然后再与温度、压力等检测信号一起被送往微处理器进行积算处理,在液晶显示屏上显示出测量结果(瞬时流量、累积流量及温度、压力数据)。
The flow profile of natural gas flow sensor is similar to that of Venturi tube. A set of spiral guide vanes are placed at the inlet side. When the fluid enters the flow sensor, the guide vanes force the fluid to produce violent vortex flow. When the fluid enters the diffusion section, the vortex flow is affected by the backflow, and begins to make a second rotation, forming a gyroscopic vortex precession phenomenon. The precession frequency is directly proportional to the flow rate and is not affected by the physical properties and density of the fluid. The signal is amplified, filtered and shaped by a preamplifier and converted into a pulse signal which is proportional to the flow rate. Then, together with the detection signals such as temperature and pressure, the signal is sent to the microprocessor for integration processing. The measurement results (instantaneous flow, cumulative flow, temperature and pressure data) are displayed on the LCD.
二、天然气流量计产品特点
2、 Product features of natural gas flowmeter
1、内置式压力、温度、流量传感器,安全性能高,结构紧凑,外形美观。
1. Built in pressure, temperature, flow sensor, high safety performance, compact structure, beautiful appearance.
2、就地显示温度、压力、瞬时流量和累积流量。
2. Local display of temperature, pressure, instantaneous flow and cumulative flow.
3、采用新型信号处理放大器和独特的滤波技术,有效地剔除了压力波动和管道振动所产生的干扰信号,大大提高了流量计的抗干扰能力,使小流量具有出色的稳定性。
3. The new signal processing amplifier and unique filtering technology are used to effectively eliminate the interference signals generated by pressure fluctuation and pipeline vibration, which greatly improves the anti-interference ability of the flowmeter and makes the small flow rate have excellent stability.
4、特有时间显示及实时数据存储之功能,无论什么情况,都能保证内部数据不会丢失。
4. The unique time display and real-time data storage function can ensure that the internal data will not be lost in any case.
5、整机功耗极低,能凭内电池长期供电运行,是理想的无需外电源就地显示仪表。
5. The power consumption of the whole machine is very low. It can run on the power supply of the internal battery for a long time. It is an ideal local display instrument without external power supply.
6、防盗功能可靠,具有密码保护,防止参数改动。
6. Reliable anti-theft function, with password protection, to prevent parameter changes.
7、表头可180度随意旋转,安装方便。
7. The meter head can be rotated at 180 degrees, which is convenient for installation.
三、天然气流量计产品参数表
3、 Product parameter table of natural gas flowmeter
Nominal diameter DN(MM) | Flow range (M3/H) | Working pressure (MPa) | Accuracy class | Repeatability |
15 | 1.5~12 | 1.6 2.5 4.0 6.3 10 16 25 42 | 1.0 1.5 | Less than 1 / 3 of the absolute value of the basic error limit |
20 | 2~15 | |||
25 | 3.0~30 | |||
32 | 6.0~60 | |||
40 | 7.0~70 | |||
50 | 10~130 | |||
80 | 30~400 | |||
100 | 70~800 | |||
125 | 90-1000 | |||
150 | 190~1900 | |||
200 | 240~3600 |
五、安装注意事项
5、 Installation precautions
1、传感器按流向标志可在垂直、水平或任意倾斜位置上安装;
1. The sensor can be installed in vertical, horizontal or any inclined position according to the flow direction sign;
2、当管线较长或距离振动源较近时,应在流量计的上、下游安装支撑,以消除管线振动的影响;
2. When the pipeline is long or close to the vibration source, supports should be installed upstream and downstream of the flowmeter to eliminate the influence of pipeline vibration;
3、传感器的安装地点应有足够的空间,以便于流量计的检查和维修,并应满足流量计的环境要求;
3. The installation site of the sensor should have enough space to facilitate the inspection and maintenance of the flowmeter, and should meet the environmental requirements of the flowmeter;
4、应避免外界强磁场的干扰;
4. The interference of external strong magnetic field should be avoided;
5、在室外安装使用时,应有遮盖物,避免烈日曝晒与雨水浸蚀,影响仪表使用寿命;
5. When the instrument is installed in the sun, it should be covered by rain to avoid the influence of the service life;
6、管线试压时,应注意智能型流量计所配置压力传感器的压力测量范围,以免过压损坏压力传感器。
6. During the pipeline pressure test, attention should be paid to the pressure measurement range of the pressure sensor equipped with the intelligent flowmeter, so as to avoid damage to the pressure sensor due to overpressure.
六、产品内部结构
6、 Internal structure of products
流量计由传感器和转换显示仪组成。
The flowmeter is composed of sensor and conversion display instrument.
1、传感器包括旋涡发生器、检测元件、整流器和壳体。
1. The sensor includes a vortex generator, a detection element, a rectifier and a shell.
旋涡发生器由特定螺旋形叶片组成,它固定在壳体收缩段前端,强迫流体产生强烈的旋涡流。
The vortex generator is composed of a specific spiral blade, which is fixed at the front end of the shell contraction section, forcing the fluid to produce strong vortex flow.
2、转换显示仪
2. Conversion display instrument
由压电传感器检测到的微弱电压信号经过放大、滤波、整形后,变成频率与流量成正比的脉冲信号,然后由显示仪计数显示。显示仪配有外输接口,输出各种信号。对测量的气体介质可进行温度和压力的补偿,转换为标准状况下的体积流量,并显示。
After amplification, filtering and shaping, the weak voltage signal detected by the piezoelectric sensor becomes a pulse signal whose frequency is proportional to the flow rate, and then is counted and displayed by the display instrument. The display instrument is equipped with export interface to output various signals. The measured gas medium can be compensated for temperature and pressure, converted into volume flow under standard conditions, and displayed.