文丘里流量计

Custom built to meet specific sewage treatment air handling system requirements, this corrosion-resistant venturi flow meter has no moving parts and is designed for a 50,000 SCFM rate of flow.

按照客户污水处理空气处理系统的要求定制生产，这种耐腐蚀的文丘里流量计没有活动部件，设计用于50000立方英尺的污水流量应用中。

This method compensates the shortage that Venturi flow meter can only be used in the case of light-phase conveying and provides a new ideal and method for measuring on line the instantaneous mass flowrate of dense gas/solid two-phase flow.

该方法弥补了文丘里流量计只能用于稀相气力输送情况的不足，同时也避免了目前速度测量精度不高的缺点，为浓相气/固两相流瞬时质量流量的在线测量提供了一条新的思路和方法。

Easily installed between ANSI flanges, the Westfall 2350 Series Venturi Flow Meter has a short laying length design and provides low permanent pressure loss.

可在ANSI法兰之间轻松安装，Westfall 2350系列文丘里流量计提供很低的永久压力损失。

The Westfall 2350 Series Venturi Flow Meter features epoxy vinyl ester construction, with a 1thick stainless steel throat and 1-1/4?

Westfall 2350系列文丘里流量计的特点是采用环氧乙烯基酯结构，以1英寸厚的不锈钢喉管和1-1/4英寸厚316L不锈钢全界面，48英寸法兰。

Metering the gas flow-rate in a wet gas flow by using a Venturi meter requires a correction of the meter over-reading to account for the liquids effect.

文丘里流量计用于湿气测量需要对因液相的存在而产生的读数偏高进行修正。

Two mathematical models have been deduced in the case of dense-phase and light-phase conveying respectively. Combining the capacitance phase concentration sensor designed and the traditional Venturi flow meter, the powder velocity and instantaneous mass flowrate are obtained by measuring concentration and differential pressure signal.

本文最后提出了一种差压—浓度法测量气/固两相流瞬时质量流量的新方法，分别建立了稀相和浓相输送情况下的粉料速度和流量测量的数学模型，即将所研制的电容式相浓度传感器与传统的文丘里流量计相结合，通过测量浓度信号及差压信号，求得粉料的传送速度及其瞬时质量流量。

Among the flowmeters discussed are orifice plate meters, venturi meter and standard nozzles, critical flow venturi nozzles, positive displacement flowmeters, turbine and related flowmeters, vortex shedding and fluidic flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, and coriolis flowmeters.

在讨论的是孔板流量计米，丘米和标准喷嘴，文丘里喷嘴临界流，容积流量计，涡轮机和相关流量计，涡脱落和射流流量计，电磁流量计，超声波流量计和科氏流量计。

After analyzing the performance anduncertainty of the DDPM vortex flowmeter in gas-liquid bubble flows, the vortexflowmeter-Venturi tube combinative method using the vortex flowmeter and the Venturi tube as measuring cells was put forward, the measurement model based on thevortex frequency and the Venturi differential pressure was established, and it showsthat the relative errors of this method for the mass flow measurement of bubble flowsare within±5%. Furthermore, the flowrate and volume void fraction of bubble flowswere obtained using a single DDPM vortex flowmeter through the relationshipbetween the frequency and amplitude of the circumferential DDPM signal, and resultsdemonstrate that the relative errors of the flowrate and volume void fraction of bubbleflows are within±5% and±10% respectively, which indicates the broad applicabilityof this method to large numbers of engineering fields.

通过分析管壁差压式涡街流量计在气液泡状流中的性能和不确定度，提出了以涡街流量计和文丘里管作为测量元件的&涡街—文丘里联合法&，建立了以涡街频率和文丘里差压为被测量的测量模型，该方法对气液泡状流质量流量的测量相对误差可达±5％；通过建立涡街周向管壁差压信号频率和幅度与被测流体的关系，使用单个涡街流量计实现了对气液泡状流流量和体积含气率的双参数测量，该方法对气液泡状流流量和体积含气率的测量相对误差分别为±5％和±10％，可以满足大量工业实际应用的要求。

This thesis deals with oil-water flow rate measurement using a venturi and develops a differential pressure-based two-phase flow rate measurement model, which does a terrific job with the use of a water fraction device. Meanwhile, Coriolis flow rate meter is also studied in the oil-water two-phase flow measurement and a SVM-based single-phase flow rate prediction method is proposed, realizing the prediction of single-phase flow rates. To overcome the disadvantages of both venturi and Coriolis flow meters, a double parameter measurement method is put forward, which combines the two meters and solves the problem of oil-water flow rate measurement. Last but not least, on the basis of the study of two-phase flow, a device for the separation of gas and liquid is designed and realizes the flow rate measurement of three-phase flow as oil, gas and water.

本文对文丘里管测量油水两相流流量进行了研究，建立了基于差压法的两相流流量测量模型，如果与含水率计相结合，可以较好的实现油水两相流的流量测量；同时研究了Coriolis流量计在油水两相流流量测量中的应用，提出了基于SVM的油水两相流分相流量预测方法，实现了油水分相质量流量的预测；针对文丘里管和Coriolis测量油水两相流存在的问题，提出了文丘里管和Coriolis流量计相结合的双参数测量方法，并实现了油水两相流的流量测量；最后，在对油水两相流研究的基础上，设计完成了一种气液分离装置，实现了油气水三相流的流量测量。

Through the analysis of the advantages and disadvantages of both Venturis and Coriolis flow meters, a double parameter measurement method is put forward with the combination of them both.

通过对文丘里管和Coriolis流量计测量油水两相流各自的优点和存在的问题分析，提出了文丘里管和Coriolis流量计相结合的双参数测量方法。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐