一、氣體渦輪流量計(jì)概述

1、 Overview of gas turbine flowmeter

氣體渦輪流量計(jì)采用先進(jìn)的微處理技術(shù)，具有功能強(qiáng),運(yùn)算精度高、性能可靠等優(yōu)點(diǎn)，主要技術(shù)指標(biāo)達(dá)到國(guó)外同類產(chǎn)品的先進(jìn)水平。是石油、化工、電力、冶金、工業(yè)與民用鍋爐等燃?xì)庥?jì)量和城市天燃?xì)狻⑷細(xì)庹{(diào)壓站計(jì)量及燃?xì)赓Q(mào)易計(jì)量的理想儀表。其工作原理是:當(dāng)氣體進(jìn)入流量計(jì)時(shí)，先經(jīng)過特殊的整流器加速，在流體的作用下，渦輪克服阻力力矩和磨擦力矩開始轉(zhuǎn)動(dòng)，當(dāng)力矩達(dá)到平衡時(shí)，轉(zhuǎn)速穩(wěn)定，渦輪的轉(zhuǎn)速與氣體流量成正比，并經(jīng)過旋轉(zhuǎn)的發(fā)訊盤上的磁體周期性地改變傳感器磁阻，從而傳感器輸出與流休成正比的脈沖信號(hào)。產(chǎn)品具有以下特點(diǎn):

The gas turbine flowmeter adopts advanced micro processing technology, which has the advantages of strong function, high calculation accuracy and reliable performance. Its main technical indicators reach the advanced level of similar products abroad. It is an ideal instrument for gas metering in petroleum, chemical, electric power, metallurgy, industrial and civil boilers, urban natural gas, gas regulator station metering and gas trade metering. Its working principle is: when the gas enters the flow meter, it is accelerated by a special rectifier. Under the action of fluid, the turbine overcomes the resistance torque and friction torque and starts to rotate. When the torque reaches balance, the rotating speed of the turbine is proportional to the gas flow rate. The magnetic resistance of the sensor is changed periodically by the magnet on the rotating transmission disk, so that the sensor output and flow can be achieved It is proportional to the pulse signal. The product has the following characteristics:

1、采用德國(guó)進(jìn)口儀表專用精密軸承，準(zhǔn)確度高，穩(wěn)定性好，范圍度寬（20:1），小口徑在一般使用條件下五年內(nèi)可免于加油，大口徑也只需偶爾加油，使用方便。

1. Special precision bearing imported from Germany is adopted, which has high accuracy, good stability and wide range (20:1). Small diameter can be free of oiling within five years under general service conditions, and large diameter only needs occasional oiling, so it is convenient to use.

2、精心設(shè)計(jì)的流道結(jié)構(gòu)，避免了氣流在軸承間的流動(dòng)，提高了渦輪流量計(jì)的介質(zhì)適應(yīng)性。

2. The well-designed runner structure avoids the flow of air between bearings and improves the medium adaptability of turbine flowmeter.

3、獨(dú)特的反推結(jié)構(gòu)和密封結(jié)構(gòu)設(shè)計(jì)，確保軸承長(zhǎng)期可靠運(yùn)行。

3. Unique reverse thrust structure and seal structure design ensure long-term and reliable operation of bearing.

4、采用磁阻元件來代替磁敏感線圈，既避免了磁吸力的存在，且提高了檢測(cè)靈敏度，進(jìn)一步降低了始動(dòng)流量，并提高了產(chǎn)品的穩(wěn)定性和可靠性。

4. The magnetic resistance element is used to replace the magnetic sensitive coil, which not only avoids the existence of magnetic attraction, but also improves the detection sensitivity, further reduces the starting flow, and improves the stability and reliability of the product.

5、獨(dú)立式機(jī)芯設(shè)計(jì)，互換性好、維護(hù)方便。

5. Independent movement design, good interchangeability and convenient maintenance.

6、集溫度、壓力、流量傳感器和智能流量積算儀于一體，可對(duì)被測(cè)氣體溫度、壓力和壓縮因子自動(dòng)跟蹤修正，直接計(jì)量氣體的標(biāo)準(zhǔn)體積流量和總量。

6. Integrating temperature, pressure, flow sensor and intelligent flow totalizer, it can automatically track and correct the temperature, pressure and compression factor of the measured gas, and directly measure the standard volume flow and total volume of gas.

7、主要性能指標(biāo)達(dá)到國(guó)際先進(jìn)水平，符合ISO9951標(biāo)準(zhǔn)。

7. The main performance indexes have reached the international advanced level and conform to iso9951 standard.

8、采用微功耗高新技術(shù)，憑內(nèi)外電源均可工作，內(nèi)電池可連續(xù)使用五年以上。

8. It can work with internal and external power supply. The internal battery can be used continuously for more than five years.

9、功能強(qiáng)大，四種補(bǔ)償方式、三種脈沖信號(hào)輸出、三種歷史數(shù)據(jù)記錄方式、兩種標(biāo)準(zhǔn)電流信號(hào)輸出方式可選。

9. It has powerful functions. Four compensation modes, three pulse signal output modes, three historical data recording modes and two standard current signal output modes can be selected.

10、通過RS485接口組成網(wǎng)絡(luò)通信系統(tǒng)，可方便實(shí)現(xiàn)自動(dòng)化管理。RS485通信協(xié)議符合MODBUS規(guī)范。

10. The network communication system is composed of RS485 interface, which can realize automatic management conveniently. RS485 communication protocol conforms to MODBUS specification.

11、表頭可180°隨意旋轉(zhuǎn)，安裝方便。

11. The meter head can be rotated at 180 ° for easy installation.

二、氣體渦輪流量計(jì)主要技術(shù)參數(shù)

2、 Main technical parameters of gas turbine flowmeter

2.1測(cè)量的介質(zhì)

2.1 measuring medium

天然氣、城市煤氣等各種燃?xì)狻⑼轭惣肮I(yè)惰性氣體。

Natural gas, city gas and other gas, alkane and industrial inert gas.

2.2使用條件

2.2 service conditions

◆環(huán)境溫度：-30℃~+60℃；      ◆介質(zhì)溫度：-20℃~+80℃；

Environment temperature: - 30 ℃ ~ + 60 ℃; medium temperature: - 20 ℃ ~ + 80 ℃;

◆大氣壓力：70kPa~106kPa；      ◆相對(duì)濕度: 5%~95%。

Atmospheric pressure: 70kpa ~ 106kpa; relative humidity: 5% ~ 95%.

2.3電氣性能指標(biāo)

2.3 electrical performance index

2.3.1工作電源與功耗

2.3.1 working power supply and power consumption

a.外電源：+24VDC土15%,適用于4mA~20mA輸出、脈沖輸出、RS485等；

a. External power supply is + 24 VDC, 15%, suitable for 4mA ~ 20mA output, pulse output, RS485, etc;

b.內(nèi)電源：1組3.6V鋰電池,可連續(xù)使用五年以上。

b. Internal power supply: a set of 3.6V lithium batteries, which can be used continuously for more than five years.

2.4.2脈沖輸出方式（LWQ型由設(shè)定選擇以下三者之一）

2.4.2 pulse output mode (LWQ type, one of the following three is selected by setting)

a.工況脈沖信號(hào),光電隔離放大輸出，高電平幅度≥20V,低電平幅度≤1V。

a. Working condition pulse signal, photoelectric isolation amplifier output, high level amplitude ≥ 20V, low level amplitude ≤ 1V.

b.與標(biāo)準(zhǔn)休積流量成正比的頻率信號(hào),經(jīng)光電隔離放大輸出,高電平幅度≥20V,低電平幅度≤1V。

b. The frequency signal which is proportional to the standard discharge is output by photoelectric isolation amplification. The amplitude of high level is more than 20V and that of low level is less than 1V.

c.定標(biāo)脈沖信號(hào)（與IC卡閥門控制器配套）,高電平幅度≥2.8V,低電平幅度≤0.2V,單位脈沖代表體積量可設(shè)定范圍:0.01m~10.00m。

c. Calibration pulse signal (matching with IC card valve controller), high level amplitude ≥ 2.8V, low level amplitude ≤ 0.2V, unit pulse representative volume can be set in the range of 0.01M ~ 10.00m.

2.4.3RS485通信（采用光電隔離RS485通信模塊）,可直接與上微機(jī)或二次儀表聯(lián)網(wǎng)，遠(yuǎn)傳顯示當(dāng)前數(shù)據(jù)和歷史記錄。

2.4.3 RS485 communication (photoelectric isolation RS485 communication module) can be directly connected with the upper computer or secondary instrument, and the current data and historical records can be displayed remotely.

2.4.4 4mA~20mA標(biāo)準(zhǔn)電流信號(hào)（采用光電隔離標(biāo)準(zhǔn)電流模塊）；兩線制或三線制。

4.4.4 4 4 Ma ~ 20 mA standard current signal (using photoelectric isolation standard current module); two wire system or three wire system.

2.4.5控制信號(hào)輸出

2.4.5 control signal output

a.上、下限報(bào)警信號(hào)(UP、LP)：光電隔離開集電極（OC）輸出，正常狀態(tài)OC門截止，報(bào)警狀態(tài)OC門導(dǎo)通，zui大負(fù)載電流50mA，工作電壓+12VC~+24VDC。

a. Upper and lower limit alarm signals (up, LP): photoelectric isolation open collector (OC) output, OC gate off in normal state, OC gate on in alarm state, Zui large load current of 50mA, working voltage of + 12vc ~ + 24VDC.

b.關(guān)閥報(bào)警(BC)和電池欠壓報(bào)警(BL)輸出(IC卡控制器用);邏輯門電路輸出,正常輸出低電平,幅度≤0.2V；報(bào)警輸出高電平,幅度≥2.8V,負(fù)載電阻≥100k0。

b. Valve closing alarm (BC) and battery under voltage alarm (BL) output (for IC card controller); logic gate circuit output, normal output low level, amplitude ≤ 0.2V; alarm output high level, amplitude ≥ 2.8V, load resistance ≥ 100k0.

2.5實(shí)時(shí)數(shù)據(jù)存貯功能

2.5 real time data storage function

a.啟停記錄：zui近的1200次啟停時(shí)間、總量記錄。

a. Start stop record: Zui's 1200 start stop time and total amount record.

b.日記錄:zui近920天的日期、零點(diǎn)時(shí)刻的溫度、壓力、標(biāo)準(zhǔn)體積流量和總量記錄。

b. Diary: Zui's 920 day date, temperature, pressure, standard volume flow rate and total volume record.

c.定時(shí)時(shí)間間隔記錄：920 條定時(shí)時(shí)間間隔的8期時(shí)間、溫度、壓力、標(biāo)準(zhǔn)休積流量和總量記錄。

c. Time interval record: 920 fixed time interval records of 8 periods of time, temperature, pressure, standard accumulated flow and total amount.

2.6防爆等級(jí)：隔爆型Exd II BT4。本安型Exia II CT4。

2.6 explosion proof grade: Flameproof Exd II BT4. Intrinsic safety Exia II cT4.

2.7防護(hù)等級(jí)：IP65

2.7 protection level: IP65

三、氣體渦輪流量計(jì)選型

3、 Selection of gas turbine flowmeter

3.1適用范圍

3.1 scope of application

a.要求流量范圍度小于20:1（見表1），且對(duì)始動(dòng)流量有較高要求的場(chǎng)合。

a. It is required that the flow range is less than 20:1 (see Table 1), and the starting flow has higher requirements.

b.不存在間隔時(shí)間短、流量波動(dòng)幅度大的頻繁流量波動(dòng)。

b. There is no frequent flow fluctuation with short interval and large fluctuation range.

c.可測(cè)量天然氣、城市煤氣、壓縮空氣,氮?dú)獾取?/span>

c. It can measure natural gas, city gas, compressed air, nitrogen, etc.

3.2規(guī)格的確定

3.2 determination of specifications

依據(jù)標(biāo)準(zhǔn)狀態(tài)下的供氣流量范圍及介質(zhì)壓力及溫度計(jì)算工作狀態(tài)下的流量范圍（可參照旋進(jìn)旋渦的選型）

According to the gas supply flow range under the standard state and the medium pressure and temperature, the flow range under the working state is calculated (refer to the selection of Precession Vortex)

3.3流量計(jì)的壓力損失

3.3 pressure loss of flowmeter

按以下公式（1）計(jì)算流量計(jì)在工作狀態(tài)下zui大流量時(shí)的zui大壓力損失△Pmax，流量計(jì)的zui大壓力損失必須滿足條件（2）方可保證流量計(jì)能正常使用，當(dāng)壓損失不滿足公式（2）時(shí)，應(yīng)選較大規(guī)格。

According to the following formula (1), calculate the Zui large pressure loss △ Pmax of the flowmeter under the working condition of Zui large flow rate. The Zui large pressure loss of the flowmeter must meet the condition (2) to ensure the normal use of the flowmeter. When the pressure loss does not meet the formula (2), the larger size should be selected.

a.壓力損失可用下式計(jì)算

a. The pressure loss can be calculated by the following formula

式中：P：氣體在標(biāo)準(zhǔn)狀態(tài)（20℃，101.325KPa）下的密度；

Where: P: density of gas in standard state (20 ℃, 101.325kpa);

△Pomax：介質(zhì)為常態(tài)干空氣（密度為1.205kg/m）時(shí)zui大流量的壓力損失（由表1查得）；

Δ pomax: pressure loss of Zui at large flow rate when the medium is normal dry air (density is 1.205kg/m) (obtained from table 1);

Pa；當(dāng)?shù)卮髿鈮海╧Pa）；       Q：工況流量(m2/h)；

PA; local atmospheric pressure (kPa); Q: flow under working condition (m2 / h);

Qmax:儀表最大工況流量(m3/h)； Pg：介質(zhì)表壓力(kPa)。

Qmax: maximum working condition flow of instrument (m3 / h); PG: medium gauge pressure (kPa).

Pn：標(biāo)準(zhǔn)大氣壓（101.325kPa）；Tn：標(biāo)準(zhǔn)狀態(tài)下優(yōu)良溫度（293.15K）；

PN: standard atmospheric pressure (101.325kpa); TN: excellent temperature under standard condition (293.15K);

Tg：介質(zhì)工況條件下優(yōu)良溫度（273.15+t）；其中t為介質(zhì)工作溫度（℃）；

TG: excellent temperature under medium condition (273.15 + T); where t is medium working temperature (℃);

Zn、Zg：分別為標(biāo)況和工況下的氣體壓縮系數(shù)。

Zn, ZG: gas compression coefficient under standard condition and working condition respectively.

b.壓損應(yīng)滿足條件

b. The pressure loss should meet the conditions

P1-△Pmax≥Lmin...................（2）

P1-△Pmax≥Lmin...................（2）

式中：P1：在zui大流量時(shí)介質(zhì)的zui低工作壓力；

Where: P1: Zui low working pressure of medium at large Zui flow rate;

△Pmax：流量計(jì)在工作狀態(tài)下zui大流量時(shí)的zui大壓力損失；

Δ Pmax: Zui large pressure loss when the flowmeter is working with large flow rate;

PLmin：用（燃）氣具使用所要求的zui低入口壓力。

Plmin: low Zui inlet pressure required by gas appliance.

四、氣體渦輪流量計(jì)外型尺寸

4、 External dimensions of gas turbine flowmeter

五、氣體渦輪流量計(jì)安裝及注意事項(xiàng)

5、 Installation and precautions of gas turbine flowmeter

a.為了便于維修,不影響流體正常輸送，建議按下圖所示設(shè)置旁通管道。

a. In order to facilitate maintenance and not affect the normal transportation of fluid, it is recommended to set up bypass pipeline as shown in the figure below.

b.為防止雜質(zhì)進(jìn)入流量計(jì),必須安裝過濾器,過濾器安裝在流量計(jì)上游≥2DN處，本公司可提供配套過濾器。

b. In order to prevent impurities from entering the flowmeter, a filter must be installed. The filter should be installed at the upstream of the flowmeter ≥ 2DN. Our company can provide matching filter.

c.安裝流量計(jì)前應(yīng)將管道內(nèi)的雜物、焊渣、粉塵等清理干凈。

c. Before installing the flowmeter, the sundries, welding slag and dust in the pipeline should be cleaned up.

d.流量計(jì)具有性能優(yōu)越的專用整流器，因此對(duì)直管段要求較低，但必須保證前直管段≥2DN,后直管段≥1DN。（對(duì)前直管段有彎管、異徑管、調(diào)壓閥等安裝方式均適合）

d. The flowmeter has a special rectifier with superior performance, so the requirements for straight pipe section are lower, but the front straight pipe section must be ≥ 2DN, and the rear straight pipe section must be ≥ 1DN. (it is suitable for elbow, reducer and pressure regulating valve in front of straight pipe section)

e.流量計(jì)水平安裝，并確保氣流方向和流量計(jì)殼體上的方向標(biāo)志-致。（須垂直安裝時(shí)應(yīng)在訂貨時(shí)注冊(cè)，產(chǎn)品需做相應(yīng)配置；安裝使用時(shí)，氣流方向應(yīng)從上至下）

e. The flowmeter shall be installed horizontally, and the flow direction shall be consistent with the direction mark on the flowmeter shell. (for vertical installation, registration should be made at the time of ordering, and the product should be configured accordingly; when installing and using, the air flow direction should be from top to bottom)

f.流量計(jì)水平安裝時(shí)，建議在流量計(jì)后直管段后安裝鋼制伸縮器（補(bǔ)償器），伸縮器必須符合管道設(shè)計(jì)的公稱通徑和公稱壓力的要求。（伸縮器是作為管道應(yīng)力的補(bǔ)償及方便流量計(jì)的安裝與拆卸）

f. When the flowmeter is installed horizontally, it is recommended to install a steel expansion joint (compensator) behind the straight pipe section behind the flowmeter. The expansion joint must meet the requirements of the nominal diameter and nominal pressure of the pipeline design. (the expansion device is used to compensate the pipeline stress and facilitate the installation and disassembly of the flowmeter)

g.流量計(jì)安裝在室外使用時(shí)，建議加配防護(hù)罩，以免雨水浸入和烈8曝曬而影響流量計(jì)使用壽命。

g. When the flowmeter is installed outdoors, it is recommended to add a protective cover to avoid rain immersion and strong 8-exposure, which will affect the service life of the flowmeter.

h.流量計(jì)使用場(chǎng)合周圍不能有強(qiáng)的外磁場(chǎng)干擾，流量計(jì)須可靠接地，但不得與強(qiáng)電系統(tǒng)地線共用。

h. There should be no strong external magnetic field interference around the flowmeter, and the flowmeter must be reliably grounded, but it should not be shared with the ground wire of strong current system.

六、氣體渦輪流量計(jì)訂貨須知

6、 Instructions for ordering gas turbine flowmeter

6.1用戶訂購本產(chǎn)品時(shí)應(yīng)根據(jù)管道公稱通徑、公稱壓力、流量范圍、介質(zhì)溫度范圍及環(huán)境條件選擇合適的規(guī)格。

6.1 when ordering this product, the user should select the appropriate specification according to the nominal diameter, nominal pressure, flow range, medium temperature range and environmental conditions.

6.2流量計(jì)一般為基本型，帶工況脈沖輸出，若需其它附件及輸出功能，請(qǐng)?jiān)谟嗀洉r(shí)說明。

6.2 the flowmeter is generally of basic type with pulse output under working condition. If other accessories and output functions are required, please explain when ordering.

6.3用戶在訂貨時(shí)，請(qǐng)按照下列格式詳細(xì)正確填寫。

6.3 when ordering, please fill in the details and correctly according to the following format.