V錐流量計概述：

Overview of V-cone Flowmeter:

V錐流量計又稱內(nèi)錐流量計、V錐、錐形流量計，是一種具有專利技術(shù)的新型差壓流量計，和其它類型的差壓流量計的基本原理相同，都是基于密封管道中的能量守恒原理，V錐流量計的獨特設(shè)計，擴(kuò)大了流量測量范圍，并避免了傳統(tǒng)差壓流量計的一些局限性，工作性能更優(yōu)。V錐流量計是在管道中心懸掛一個錐形截流件，錐形件阻礙介質(zhì)流動，重塑流速曲線，測量介質(zhì)包括水、蒸汽、空氣、天然氣、氮氣、焦?fàn)t煤氣和有機(jī)氣體等。介質(zhì)條件可從深低溫到超臨界狀態(tài)。工作溫度最高450℃，最大壓力25Mpa，可測量最高雷諾數(shù)為5*106，最低雷諾數(shù)為8*103甚至更低。產(chǎn)生滿刻度差壓信號從最低小于0.1 千帕到最高幾十千帕。

V-cone Flowmeter, also known as inner cone flowmeter, V-cone Flowmeter and cone-shaped flowmeter, is a new type of differential pressure flowmeter with patented technology. The basic principle of V-cone Flowmeter is the same as that of other types of differential pressure flowmeter. The unique design of V-cone Flowmeter expands the flow measurement range and avoids some limitations and working performance of traditional differential pressure flowmeter Can be better. V-cone Flowmeter is a cone-shaped interceptor suspended in the center of the pipeline. The conical part hinders the flow of medium and remoulds the velocity curve. The measuring medium includes water, steam, air, natural gas, nitrogen, coke oven gas and organic gas. The medium condition can be from deep low temperature to supercritical state. The maximum working temperature is 450 ℃, the maximum pressure is 25MPa, the maximum measured Reynolds number is 5 * 106, the minimum Reynolds number is 8 * 103 or even lower. The full scale differential pressure signal is generated from the minimum less than 0.1 kPa to the highest several tens of kPa.

V錐流量工作原理：

V-cone flow working principle:

V錐流量計是一種差壓流量儀表，迄今為止以差壓原理設(shè)計的流量儀表已經(jīng)有一百多年的應(yīng)用歷史了。差壓原理是基于密封管道中的能量轉(zhuǎn)換原理，也就是說對穩(wěn)定流體，流量與管道中介質(zhì)流速的平方根成正比。當(dāng)介質(zhì)接近錐體時，其壓力為P1，在介質(zhì)通過錐體的截流區(qū)時，速度增大，壓力降低為P2，P1和P2都通過錐形流量計的取壓口引到差壓變送器上，當(dāng)流速發(fā)生變化時，錐形流量計的兩個取壓口之間的差壓值會增大或縮小。

V-cone Flowmeter is a differential pressure flow instrument. So far, the flow meter designed on the principle of differential pressure has been applied for more than 100 years. The principle of differential pressure is based on the principle of energy conversion in a sealed pipeline, that is, for a stable fluid, the flow rate is proportional to the square root of the medium velocity in the pipeline. When the medium is close to the cone, its pressure is P1. When the medium passes through the intercepting area of the cone, the velocity increases and the pressure decreases to P2. P1 and P2 are led to the differential pressure transmitter through the pressure tap of the cone flowmeter. When the flow rate changes, the differential pressure between the two pressure taps of the cone flowmeter will increase or decrease.

V錐流量計在進(jìn)行流量計算時所采用的計算公式同其他差壓流量儀表相同，但其截流元件的獨特設(shè)計，迫使管道中心的介質(zhì)繞著錐體流動，與其他差壓流量計相比這樣有很多優(yōu)點。我們可以借助理想狀態(tài)流速曲線分布圖來理解錐形流量計的性能。管道中的流體沒有受到任何干擾和阻礙，即是我們所說的理想流態(tài)，他的流速分布均勻，靠近管壁的流速幾乎為零，管道中心的流速達(dá)到最大，靠近管壁的流速幾乎為零，是由于管壁對介質(zhì)的摩擦力造成的。由于錐體懸掛在管線中心，他直接同流體的高速區(qū)接觸，迫使高速區(qū)的流體同近管壁低速區(qū)的流體相混合從而使流速均勻化。所以即使流速很低，錐形流量計仍能使流體與管道中心的最高流速連續(xù)作用產(chǎn)生正確差壓。

The calculation formula of V-cone Flowmeter is the same as that of other differential pressure flow meters, but the unique design of its intercepting element forces the medium in the center of the pipeline to flow around the cone, which has many advantages compared with other differential pressure flow meters. We can understand the performance of cone flowmeter with the help of ideal velocity curve. The fluid in the pipeline is not interfered and obstructed, which is what we call the ideal flow state. Its velocity distribution is uniform, the velocity near the pipe wall is almost zero, the velocity in the center of the pipe reaches the maximum, and the velocity near the pipe wall is almost zero, which is caused by the friction force between the pipe wall and the medium. Because the cone is suspended in the center of the pipeline, it directly contacts with the high-speed region of the fluid, forcing the fluid in the high-speed region to mix with the fluid in the low-speed region near the pipe wall, thus homogenizing the velocity. Therefore, even if the flow rate is very low, the cone flowmeter can still make the fluid and the maximum flow rate in the center of the pipeline continuously act to produce the correct differential pressure.

現(xiàn)實中，流速很難分布均勻，管道上的任何變化都可能對流體造成影響，如：灣頭、閥門、縮徑、擴(kuò)徑、泵、三通等等，而錐形流量計利用錐體對上游的流速分布曲線重新進(jìn)行塑造，即使在極為惡劣的情況下，仍能保證測量精度。

In reality, the velocity distribution is difficult to be uniform, any change in the pipeline may affect the fluid, such as: Bay head, valve, reducing diameter, expanding diameter, pump, tee, etc., while the conical flowmeter uses the cone to reshape the upstream velocity distribution curve, which can still ensure the measurement accuracy even in extremely bad conditions.

V錐流量特點：

V-cone flow characteristics:

流量計精度：±0.5％、±1.0％、±1.5％系統(tǒng)精度須參照應(yīng)用條件及二次表的精度。

Flowmeter accuracy: ± 0.5%, ± 1.0%, ± 1.5%. The system accuracy must refer to the application conditions and the accuracy of the secondary meter.

重復(fù)性好：優(yōu)于±0.1%

Good repeatability: better than ± 0.1%

量程比寬：正常情況下為10：1，若有必要也可加大。

Range ratio: 10:1 under normal conditions, and can be increased if necessary.

直管段要求低：流量計前0~3D 直管段、后0~1D 直管段即可保證測量精度。實驗證明，V錐流量計可以接近單彎管或不同平面的雙彎管而對精度影響很小。

Low requirements for straight pipe section: the front 0 ~ 3D straight pipe section and the back 0 ~ 1D straight pipe section of flowmeter can ensure the measurement accuracy. Experiments show that the V-cone Flowmeter can be close to the single elbow or the double elbow with different plane, but has little influence on the accuracy.

長期穩(wěn)定性好：錐體的外形設(shè)計保證流體在流經(jīng)錐體時是一種漸變的過程，無突變，β值可保持長期不變，儀表可長期使用不需標(biāo)定。

Good long term stability: the shape design of the cone ensures that the fluid flow through the cone is a gradual process without sudden change, the β value can be kept unchanged for a long time, and the instrument can be used for a long time without calibration.

信號穩(wěn)定：所有差壓流量計都會有“信號波動”，也就是說即使流體非常穩(wěn)定，通過一次節(jié)流元件產(chǎn)生的信號也會有波動。對孔板而言，在節(jié)流件后形成的旋渦較長，這些長的旋渦會產(chǎn)生高幅、低頻波動信號，這些信號會對差壓表的讀數(shù)造成干擾。而錐形流量計會在其下游形成小旋渦，產(chǎn)生低幅、高頻波動信號。

Signal stability: all differential pressure flow meters will have "signal fluctuation", that is to say, even if the fluid is very stable, the signal generated by primary throttling element will fluctuate. For the orifice plate, the vortices formed behind the throttling part are longer, which will produce high amplitude and low frequency fluctuation signals, which will interfere with the reading of differential pressure gauge. However, the conical flowmeter will form small vortices downstream and generate low amplitude and high frequency fluctuation signals.

壓損 ?。河捎跊]有突出的擋板，因此錐形流量計的永久壓力損失比孔板低3/4。

Small pressure loss: due to no protruding baffle, the permanent pressure loss of cone flowmeter is 3 / 4 lower than that of orifice plate.

無滯留死區(qū)：錐體的“吹掃式”設(shè)計不存在死區(qū)，因此在錐體上不會堆積流體碎片、粘渣或雜質(zhì)。

No dead zone: there is no dead zone in the "purge" design of the cone, so there is no accumulation of fluid debris, slag or impurities on the cone.

混合器作用：V 錐流量計的下游所產(chǎn)生的旋渦是短旋渦，可在下游將介質(zhì)混合，因此，目前V錐形流量計在作為流量計工作的同時，還可在很多場合用做靜態(tài)攪拌器，可迅速而充分的將介質(zhì)攪拌均勻。

Mixer function: the vortex generated downstream of the V-cone Flowmeter is a short vortex, which can mix the media in the downstream. Therefore, while working as a flowmeter, the V-cone Flowmeter can also be used as a static mixer in many fields, which can quickly and fully mix the medium evenly.

V錐流量應(yīng)用：

V-cone flow application:

介 質(zhì)：煤氣、天然氣（包括含濕度5%以下）、各種碳?xì)浠衔铮òê瑵竦腍C氣體）、各種稀有氣體（氫、氦、氬、氧、氮等）、氯氣、濕的氯化物氣體、空氣（包括含水、含SiO2粒子以及含其他懸浮物的空氣）、煙道氣、飽和蒸汽（含汽、水兩相流）、過熱蒸汽、水等。

Introduction Quality: gas, natural gas (including humidity below 5%), various hydrocarbons (including wet HC gas), various rare gases (hydrogen, helium, argon, oxygen, nitrogen, etc.), chlorine, wet chloride gas, air (including water, SiO2 particles and other suspended substances), flue gas, saturated steam (including steam and water two-phase flow), superheated steam, water, etc Etc.

條 件：從深冷到超臨界狀態(tài)，最高溫度達(dá)450℃，最大壓力25Mpa。

Conditions: from Cryogenic to supercritical state, the maximum temperature is 450 ℃, and the maximum pressure is 25MPa.

計 算：每一個錐形流量計都根據(jù)流體的性質(zhì)、壓力和溫度用專門的軟件進(jìn)行計算。用戶可根據(jù)自己的應(yīng)用條件（所測介質(zhì)的組份、溫度、壓力、管徑、最大流量、常用流量、最小流量、準(zhǔn)許最大壓力損失）選擇β值。

Calculation: each cone flowmeter is calculated by special software according to the property, pressure and temperature of the fluid. Users can select β value according to their own application conditions (composition of measured medium, temperature, pressure, pipe diameter, maximum flow rate, common flow rate, minimum flow rate and allowable maximum pressure loss).

維 護(hù)：錐形流量計免維護(hù)，不需要定期維護(hù)和檢定。

Maintenance: the cone flowmeter is maintenance free and does not need regular maintenance and verification.

V-cone flow product selection