| 孔板流量计使用正确的流速以及特点 |
| 信息来源： 流量变送器 | 2019-04-12 点击量： 7264 |
孔板流量计使用正确的流速以及特点？西安华恒仪表制造有限公司介绍：孔板流量计按国标规定进行设计、制造和检定的标准孔板无需实流标定，精度高、结构简单、制造成本低，但压力损失在所有标准节流装置中最大，不适用于要求压力损失小的情况，标准孔板广泛用于石油、化工、冶金、电力等行业。
Does orifice flowmeter use correct flow rate and characteristics?Xi'an Huaheng Instrument Manufacturing Co.,Ltd.Introduces that the orifice plate flowmeter designed,manufactured and calibrated according to the national standard does not need real-flow calibration,has high accuracy,simple structure and low manufacturing cost,but the pressure loss is the largest in all standard throttling devices,and is not suitable for the situation of low pressure loss.The standard orifice plate is widely used in petroleum,chemical,metallurgical,electric power and other industries.Industry.
孔板流量计使用正确的流速
Orifice Flowmeter Uses Correct Flow Velocity
为使测量的流量有足够的准确度。例如孔板前气流有旋转、偏流、涡流而使孔板产生的差压发生误差。平息这些不正常流动最简单的办法就是延长管子的长度，这就是孔板流量计前后必须有一定直线段的原因。
In order to make the flow measurement accurate enough.For example,the differential pressure produced by orifice plate is erroneous due to the rotation,deviation and eddy current of air flow in front of orifice plate.The easiest way to alleviate these abnormal flows is to extend the length of the pipe,which is why the orifice flowmeter must have a certain straight line before and after.
也与不正常气流的形状有关。直角拐弯处一般应有810个管径的直线段长度才能安装孔板，直线段长度和流量孔板的孔径、孔板型式有关。孔板后也需要45个的管径的直线段。如果不正常气流是某种旋转气流，例如管子转弯时有切向流速存在这时直线段长度必须延长到1520直径长才能装流量孔板。
It is also related to the shape of abnormal airflow.The length of straight section with 810 diameters at right corner should be used to install orifice plate.The length of straight section is related to the orifice diameter and orifice plate type of flow orifice plate.A straight section of 45 diameters is also required behind the orifice plate.If the abnormal flow is a kind of rotating flow,such as tangential flow velocity when the pipe is turning,the length of the straight line section must be extended to 1520 diameter in order to install the flow orifice.
配合各种差压计或差压变送器可测量管道中各种流体的流量。孔板流量计节流装置包括环室孔板，RFLG系列孔板流量计是测量流量的差压发生装置。喷嘴等。孔板流量计节流装置与差压变送器配套使用，可测量液体、蒸汽、气体的流量，广泛应用于石油、化工、冶金、电力、轻工等部门。
The flow of various fluids in the pipeline can be measured with various differential pressure gauges or differential pressure transmitters.The orifice plate flowmeter throttling device includes ring chamber orifice plate.RFLG series orifice plate flowmeter is a differential pressure generating device for measuring flow.Nozzle and so on.The orifice plate flowmeter throttling device matches with differential pressure transmitter,which can measure the flow of liquid,steam and gas.It is widely used in petroleum,chemical,metallurgical,electric power,light industry and other departments.
当它流经管道内的节流装置时，充满管道的流体。流束将在节流装置的节流件处形成局部收缩，从而使流速增加，静压力低，于是节流件前后便产生了压力降，即压差，介质流动的流量越大，节流件前后产生的压差就越大，所以孔板流量计可以通过测量压差来衡量流体流量的大小。这种测量方法是以能量守衡定律和流动连续性定律为基准的，并能进行温度、压力自动补偿的新一代流量计，智能节流装置（孔板流量计）集流量、温度、压力检测功能于一体。该孔板流量计采用先进的微机技术与微功耗新技术，功能强，结构紧凑，操作简单，使用方便。
When it flows through the throttling device in the pipeline,it fills the pipeline with fluid.The beam will shrink locally at the throttle part of the throttle device,thus increasing the velocity of flow and lowering the static pressure.Pressure drop will occur before and after the throttle part,that is,pressure difference.The larger the flow rate of the medium,the greater the pressure difference between the front and back of the throttle part.So orifice plate flowmeter can measure the flow rate by measuring the pressure difference.This measurement method is based on the law of energy conservation and the law of flow continuity,and can automatically compensate for temperature and pressure.Intelligent throttle device(orifice flowmeter)integrates the functions of flow,temperature and pressure detection.The orifice plate flowmeter adopts advanced computer technology and new technology of micro power consumption.It has strong function,compact structure,simple operation and convenient use.
特点：
简单、牢固，节流装置结构易于复制。性能稳定可靠，使用期限长，价格低廉孔板计算采用国际标准与加工。
全部单相流皆可测量，孔板流量计应用范围广部分混相流亦可应用即可投用标准型节流装置无须实流校准。
Characteristics:
Simple and firm,the structure of throttle device is easy to replicate.Stable and reliable performance,long service life,low-cost orifice plate calculation using international standards and processing.
All single-phase flow can be measured.The orifice flowmeter can be used for a wide range of miscible flow.The standard throttling device can be put into use without real-flow calibration.
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