進口孔板流量計原理及用途Principle and purpose

孔板流量計是將標準孔板與多參量差壓變送器（或差壓變送、溫度變送器及壓力變送器）配套組成的高量程比差壓流量，充滿管道的流體流程管道內的節流裝置，在節流件附近邊成局部收縮，流速增加，在其上、下游兩側產生靜壓力差（如圖）。在已知有關參數的條件下，根據流動連續件原理和伯努利方程可以推異出辨壓與流量之間的關系（流量愈大，所產生的壓差愈大）而求得流量。

Orifice plate flowmeter is a high range ratio differential pressure flow device composed of a standard orifice plate and a multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter, and pressure transmitter). The throttling device in the fluid flow pipeline that is filled with the pipeline locally contracts near the throttling component, increases the flow rate, and generates a static pressure difference on both upstream and downstream sides (as shown in Figure 1). Under the condition that relevant parameters are known, the relationship between differential pressure and flow rate can be inferred based on the principle of flow continuity and Bernoulli equation (the larger the flow rate, the greater the pressure difference generated) to obtain the flow rate.

法蘭取壓標準孔板：1.取壓法蘭；2.節流件（孔板芯）3.金屬纏繞墊片；4.高低壓取壓管；5.標牌；6.彈墊；7.螺母；8.平墊；9.螺栓。

Standard orifice plate for flange pressure measurement: 1. Pressure measurement flange; 2. Throttling element (orifice core) 3. Metal wound gasket; 4. High and low pressure pressure tapping pipes; 5. Signage; 6. Spring pad; 7. Nut; 8. Flat cushion; 9. Bolts

環室取壓標準孔板：1.法蘭；2.前環室；3.后環室；4.節流件（孔板芯）5.金屬纏繞墊片；6.高低壓取壓管；7.平墊；8.螺母；9.螺栓；10.彈墊。

Standard orifice plate for ring chamber pressure measurement: 1. flange; 2. Front ring chamber; 3. Rear ring chamber; 4. Throttling element (orifice core) 5. Metal wound gasket; 6. High and low pressure pressure tapping pipes; 7. Flat cushion; 8. Nut; 9. Bolts; 10. Spring pad

角接鉆孔取壓標準孔板：1.法蘭；2節流件（孔板芯）3.金屬纏繞墊片；4.高低壓取壓管；5.標牌；6.彈墊；7.平墊；8.螺母；9.螺栓。

Corner joint drilling pressure standard orifice plate: 1. flange; 2. Throttling element (orifice core) 3. Metal wound gasket; 4. High and low pressure pressure tapping pipes; 5. Signage; 6. Spring pad; 7. Flat cushion; 8. Nut; 9. Bolts

徑距取壓管段式標準孔板：1.法蘭；2.測量導管；3.節流件（孔板芯）4.高低壓取壓管

Standard orifice plate for diameter distance pressure measuring pipe section: 1. flange; 2. Measurement catheter; 3. Throttling element (orifice core) 4. High and low pressure pressure tapping pipe

技術參數 Technical parameter

主要特點 Main features

節流裝置結構簡單、牢固，性能穩定可靠，使用期限長 The throttling device has a simple and firm structure, stable and reliable performance, and a long service life

應用范圍廣，全部單相流皆可測量，部分混相流亦可應用 Wide application range, all single-phase flows can be measured, and some mixed phase flows can also be applied

標準型節流裝置無須實流校準，即可投用 The standard throttling device can be put into use without actual flow calibration

安裝更簡單，無須引壓管，可直接接差壓變送器和壓力變送器 Installation is simpler, without the need for pressure pipes, and can be directly connected to differential pressure transmitters and pressure transmitters

采用進口單晶硅智能差壓傳感器 Adopting imported monocrystalline silicon intelligent differential pressure sensor

高精度，完善的自診斷功能 High precision and comprehensive self-diagnosis function

智能孔板流量計智能孔板流量計其量程可自編程調整 The range of the intelligent orifice flowmeter can be self programmable and adjusted

智能孔板流量計可同時顯示累計流量、瞬時流量、壓力、溫度 The intelligent orifice flowmeter can simultaneously display cumulative flow rate, instantaneous flow rate, pressure, and temperature

具有在線、動態全補償功能外，智能孔板流量計還具有自診斷、自行設定量程 In addition to online and dynamic full compensation functions, the intelligent orifice flowmeter also has self-diagnosis and self setting range

配有多種通訊接口 Equipped with multiple communication interfaces

穩定性高 High stability

量程范圍寬、大于10：1  Wide range, greater than 10:1

安裝指導 Installation instructions

1.孔板安裝前應仔細核對標準孔板的編號、位號、規格是否與管道情況、流量范圍等參數相符。

2.新設管路系統，必須先經沖洗、掃線后再安裝孔板，以防管內雜物堵塞或損傷孔板，

3．孔板的中心應當與管道中心同軸，同軸度誤差不得超過±【0.015*（1/β）-0.015】。并且節流端平面應當與管道的垂直，誤差不得超過±1°。

4.孔板安裝時，墊片夾緊后不得突入管道內壁。

5.孔板安裝處必須嚴密，不允許有泄漏現象。安裝后，進行試壓

6.導壓管應垂直或傾斜敷設，其便斜度不得小于1：12。粘度較高的流體傾斜度還應增大。當差壓訊號傳送距離超過3米時，導壓管應當分段傾斜，并在各最高點和最低點分別安裝集氣器和沉降器。

7.在孔板流量計前后若需安裝閥門，最好選閘閥且在運行中全開；調節閥則應在下游5DN之后的管路中。

8.引壓管路應有牢固的支架托承，兩根取壓管路應盡可能互相靠近并遠離熱源或震動源，測量水蒸汽流量時，應用保溫材料一同包扎，必要時（如氣溫0℃以下）加伴熱管防止結冰。在測量臟污流量時，應附設隔離器或沉降器

9.測量液體流量時引壓管水平段應在同一水平面內。若是在垂直管道上安裝節流件，引壓短管之間相距一定的距離（垂線方向），這對差壓變送器的零點有影響，應通過“零點遷移”來校正。

10.引壓管路的內徑與管路長度和介質臟污程度有關，通常在45米以內用內徑為8-12mm的管子

11.引壓管路內必須始終保持單相流體狀態。被測流體是氣體時，引壓管路（包括差壓計的壓力腔）內全部是氣相；被測流體是液體時，引壓管路內全部是液相，絕對不能有氣泡。為此應在引壓管路的最低點裝排水閥或在最高點裝排氣閥，在新裝或檢修差壓變送器時時應特別注意。

12.孔板在垂直管道上安裝時，肌壓口位置可以在肌壓裝置的平面上任章選擇，當孔板水平或順斜安裝在主管道內時，即壓口位置如圖所示。

13.節流裝置上、下游側要保證一定長度的直管段，具體要求見表：

測量無腐蝕液體流量的安裝示意圖 1-節流裝置；2-閥門；3-沉降器；4-差壓計；5-集氣器

Installation diagram for measuring the flow rate of non corrosive liquid -1- Throttling device; 2-valve; 3- Settler; 4- Differential pressure gauge; 5- Gas collector

測量腐蝕液體流量的安裝示意圖（隔離液密度大于被測液密度）1-節流裝置；2-閥門；3-隔離器；4-沉降器；5-差壓計；6-集氣器

Installation diagram for measuring corrosion liquid flow rate (isolation liquid density greater than measured liquid density) 1- throttling device; 2-valve; 3-Isolator; 4- Settler; 5- Differential pressure gauge; 6- Gas collector

測量無腐蝕性氣體流量的安裝示意圖 1-節流裝置；2-閥門；3-吹洗閱；4-沉降器；5-差壓計

Installation diagram for measuring non corrosive gas flow rate - throttling device; 2-valve; 3- Purge and read; 4- Settler; 5-Differential pressure gauge

測量腐蝕性氣體流量的安裝示意圖（液體隔離）1-節流裝置；2-閥門；3-隔離器；4-差壓計；5-沉降器

Installation diagram for measuring corrosive gas flow (liquid isolation) 1- Throttling device; 2-valve; 3-Isolator; 4- Differential pressure gauge; 5-Settler

測量蒸汽流量安裝示意圖 1-節流裝置；2-閥門；3-保溫層；4-沉降器；5-差壓計；6-集氣器

Installation diagram for measuring steam flow 1-Throttling device; 2-valve; 3- Insulation layer; 4- Settler; 5- Differential pressure gauge; 6- Gas collector

技術要求

1.差壓計裝在節流裝置下方，沉降器是可選項。

2.向隔離器中充灌液體時，應先灌密度較大的液體

3.馬奧液體的起始液面是充灌液體必須達到的液面，以便保證隔離液有足夠的儲備量。

4.隔離液終結液面是重新充灌陷離液體時的液面。

5.如果被測液體可能析出沉淀物時，建議安裝沉降器。

常見故障及解決方法 Common faufts and Solutions

附件 appendix

自帶附件：引壓管、連接法蘭、螺栓、墊片

可選附件：冷凝器、承插焊問閥、三閥組、針型截止閥、集氣器、隔離器、沉降器

可選相關商品：壓力變送器、溫度變送器、流量計積算儀、智能差壓變送器。