威力巴流量计概述 I. Overview of Verabar Flowmeter
采用了完全符合空气动力学原理的工程结构设计，是一种在精度、功效及可靠方面达到了无比卓越程度的传感元件。 The Verabar flowmeter uses an engineering structure design that fully complies with the aerodynamic principle. It is a sensor element that has achieved unparalleled levels of accuracy, efficiency and reliability.
1, Verabar flowmeter uses
适用于气体、液体和蒸汽的高精度流量测量 。 Verabar flowmeters are suitable for high-precision flow measurement of gases, liquids and vapors . 是一种差压式、速率平均式流量传感器， 通过传感器在流体中所产生的差压进行流量测量 。 Verabar flowmeter is a differential pressure, rate average flow sensor, which measures the flow through the differential pressure generated by the sensor in the fluid . 流量计 反映流体真实的流速，其精度达到± 1.0，重复性达± 0.1。 Verabar flowmeters reflect the true flow velocity of the fluid, with an accuracy of ± 1.0 and repeatability of ± 0.1. The outstanding advantage of Verabar is: output a very stable, pulse-free differential pressure signal
2.Design characteristics of the probe
，可以生成稳定的差压信号，并且有效防堵。 The probe with a cross-sectional shape of the bullet head can generate accurate pressure distribution and fixed fluid separation points; the low-pressure pressure taking holes located on the two sides behind the probe side and before the fluid separation point can generate stable differential pressure signals and effectively prevent blockage. The internal integrated structure can avoid signal leakage, improve the structural strength of the probe, and maintain long-term high accuracy.
3. Verabar probe anti-clogging design
计探头以其卓越的防堵设计，彻底摆脱了阿牛巴等插入式流量探头易堵塞的弊端，使均速管流量探头的防堵水平达到了空前的高度。 With its excellent anti-blocking design, Verabar flowmeter probes completely get rid of the shortcomings of plug-in flow probes such as Annubar.
。 The high-pressure pressure taking hole of the probe will not be blocked by the front of the probe to form a high-pressure area. The pressure is slightly higher than the static pressure of the pipeline, which prevents particles from entering . Please note: The velocity of the fluid at the probe's high-pressure tapping hole is zero, and no objects will enter the tapping hole. ， 进入弯管，很快形成了压力平衡的状态。 When the machine is turned on, the fluid enters the elbow under the static pressure of the pipeline , and a pressure equilibrium state is quickly formed. When the pressure equilibrium state is formed, the fluid encounters high pressure at the inlet of the elbow, detours, and no longer enters the elbow.
低压孔实现本质防堵一般情况下，灰尘、沙子和颗粒在涡街力的作用下，集中在探头的后部。 The low pressure orifice of Verabar flowmeter achieves essential anti-blocking. Generally, dust, sand and particles are concentrated at the back of the probe under the action of vortex force. 。 This is why autumn leaves are always concentrated behind leeward houses . The other low-pressure pressure taking holes of other probes are taken in the vacuum area at the end of the probe. Under the action of vortex force, the low-pressure pressure taking holes of the probe are quickly blocked by impurities brought by eddy current. 后两边 ，流体分离点和尾迹区的前部。 The unique design of the Verabar flowmeter makes the low-pressure pressure- receiving holes on the back of the probe side , the front of the fluid separation point and the trailing area. 止了堵塞并且能产生一个非常稳定的低压信号 。 This design essentially prevents clogging and produces a very stable low-voltage signal .
4. Advantages of the probe
Can measure a variety of media and has a wide range of applications
High accuracy and large range ratio
Probe takeout hole is essentially anti-blocking
The measurement signal is stable and the fluctuation is small
Low permanent pressure loss in the pipeline
Unique high-strength bullet-shaped single-piece dual-cavity structure
Low installation cost, basically maintenance-free
Can be installed and serviced online
5. Characteristics of Verabar averaging tube flow sensor
● Stable signal
。 Verabar's low-pressure tapping holes are located on the back two sides of the probe side, between the fluid and the probe separation point, away from the vortex wave area .
● Excellent long-term high accuracy
能够保证精度的长期稳定，这是因为： Verabar flowmeters can ensure long-term accuracy, because:
⑴. It is not affected by abrasion, dirt and oil.
⑵. There are no moving parts in the structure.
⑶. The occurrence of blockage is excluded from the design. At the front of the probe, a high static pressure area surrounds the probe so that the high-pressure pressure taking hole will not be blocked. 压孔不会被掠动 ，而其它的探头容易堵塞，因为它们的低压取压孔在杂质聚集的低压波动区域 。 The most important thing is that the low-pressure holes are taken at the back of the probe side, and the fluid is swept across the surface, which protects the low-pressure holes from being swept , and other probes are easy to block because their low-pressure pressure holes collect impurities Area of low pressure fluctuations .
● Lowest installation cost
⑴. It only needs a few inches of line welding, and the installation is very simple and fast.
⑵. Apply special tools to achieve online installation with pressure.
用。 ⑶. All valves and interfaces of various instruments need only simple assembly, which requires very low assembly costs .
● Very low operating costs
⑴. It is a non-constrictive design. As a plug-in flow probe, Verabar has the lowest operating cost.
威. Verabar flowmeters only produce very low permanent pressure losses, typically less than 0.7KPa
⑶. The permanent pressure loss generated by an orifice plate element exceeds 14KPa
⑷. Compared with the orifice plate, Verabar's energy loss is reduced by 95%.
● The continuous operation of Verabar basically eliminates the possibility of clogging, but in the following cases, Verabar still needs to pay attention to the clogging:
⑴. When the impulse tube leaks and the high pressure balance area of the probe is damaged, particles with smaller diameters in the impurities may enter the pressure taking hole.
⑵. When the pipeline is stopped, due to the Brownian motion of the molecules, small particles of impurities may enter the pressure taking hole.
⑶. The system frequently starts and stops. At the moment when the high-pressure area is formed, small particles of impurities may enter the pressure taking hole. Over time, the probe may be blocked.
⑷. The medium contains a large amount of tar, algae, or contains fibrous substances, which may also cause the probe to be blocked.
6. Apply new technologies
The original design of the valve joint with valve .. The new design concept provides a new concept, the instrument stop valve is built in the connector of the instrument.
1. Make installation and maintenance easier.
2. Reduce the number of assembly parts and reduce the cost of hardware connection.
Fast installation system
Quick insertion and removal
● Sealed drive system prevents damage to components
● Can be applied to the installation of multiple probes
Full installation within 1 hour
主要技术指标 Main technical indicators of Verabar flowmeter
、威力巴流量测量系统性能指标测量精度：± 1 重复精度：± 0.1 1. Performance index of Verabar flow measurement system Measurement accuracy: ± 1 Repeat accuracy: ± 0.1
Applicable pressure: 0 ～ 40MPa Applicable temperature: － 180 ℃ ～ ＋ 550 ℃
Upper measurement limit: Depends on the probe strength. Lower measurement limit: Depends on the minimum differential pressure required. Range ratio: greater than 10: 1
Applicable pipe diameter: 38mm ～ 9,000mm Round pipe and square pipe Applicable medium: full pipe, unidirectional flow, unidirectional gas, steam and liquid Verabar with a viscosity of not more than 10 centipoise It is widely used for the measurement of various gases, liquids and vapors. The following are typical application media.
Gas / Liquid / Steam Natural Gas / Cooling Water / Saturated Steam Compressed Air / Boiler Water / Superheated Steam Gas / Demineralized Gas Hydrocarbon / Liquid Hydrocarbon Hot Air / Low Temperature Liquid Generator Gas / Heat Conductive Liquid