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Industry Information
The structure of the target type flowmeter can be divided into pipe-type clamp type and plug-in type
2012-3-3 11:01:14

是差压流量计的一个品种,它在工业上的开发应用已有数十年的历史。 Target type flowmeter is a variety of differential pressure flowmeter, which has been developed and applied in industry for decades. In the 1970s, China developed electric and pneumatic target type flow transmitters. It is a testing instrument for electric and pneumatic unit combination meters. Since the force converter directly used the force balance mechanism of the differential pressure transmitter at the time, this flowmeter inevitably brought many defects caused by the force balance mechanism itself, such as easy zero drift, low measurement accuracy, and reliable lever mechanism. Poor sex, etc. Due to the drag of the poor performance of the force balancing mechanism, many advantages of the target type flowmeter itself have not been effectively used. So far, users' bad impressions of the old target flowmeter have not been eliminated. The force converter of the new target type flowmeter uses a strain type force converter, which completely eliminates the shortcomings of the above-mentioned force balance mechanism. The new target type flowmeter also applies microelectronic technology and computer technology to the signal converter and display part. The meter has a series of advantages and I believe it will play an important role in many flowmeters in the future.

: 在测量管(仪表表体)中心同轴放置一块园形靶板,当流体冲击靶板时,靶板上受到一个力F,它与流速V,介质密度ρ和靶板受力面积A之间关系式如式(1)所示。 Target type flowmeter : A circular target plate is placed coaxially at the center of the measuring tube (meter body). When the fluid hits the target plate, a force F is applied to the target plate, which is related to the flow velocity V, the medium density ρ, and the target plate. The relationship between the force areas A is shown in formula (1). (1) where F——force on the target, N; CD——resistance coefficient; ρ——fluid density, kg / m3; V——fluid flow velocity, m / s; A——force on the target Area, m2. After derivation and conversion, the flow calculation formula is as follows: where qm, qv——respectively are mass flow and volume flow, kg / h, m3 / h; α——flow coefficient; D——inner diameter of the measuring tube, mm; β ——Diameter ratio, β = d / D; d——diameter of target plate, mm. The remaining symbols are the same as above. The target board is transformed into an electric signal by a force converter, and after pre-amplification, AD conversion and computer processing, the corresponding flow and total amount can be obtained. 2. Structure The schematic diagram of the target type flowmeter is shown in Figure 2. It consists of a detection device, a force converter, a signal processing and a display instrument. The detection device includes a measuring tube and a target plate, the force converter is a strain gauge sensor, and the signal processing and display instrument can be directly read and displayed in situ or can transmit standard signals at long distances. The structure type of the target type flowmeter can be divided into pipeline type, clamp type and plug-in type, etc., and various types of structure types can also be divided into two types: integrated and separated. The integrated type is a direct reading display on the site, while the separate type separates the digital display from the detection device (generally no more than 100m).

主要特点:1、 感测件为无可动部件,结构简单牢固;2、 应用范围和适应性很广泛,一般工业过程中的流体介质,包括液、气和蒸汽,口径范围(DN15以上),各种工作状态(高、低温,常压、高压)皆可应用,可以说其应用范围可与孔板流量计相比美。 The main characteristics of the target type flowmeter : 1. The sensing element has no moving parts, and the structure is simple and firm; 2. The application range and adaptability are very wide. The fluid medium in general industrial processes, including liquid, gas and steam, the caliber range ( DN15 and above), all kinds of working conditions (high, low temperature, normal pressure, high pressure) can be applied, it can be said that its application range can be compared with the orifice flowmeter. 3. High accuracy, the total measurement can reach 0.2% R; 4. Wide range, 4: 1 ~ 15: 1 to 30: 1; 5. It can solve difficult flow measurement problems, such as measurement containing impurities (particles) Dirty fluids such as crude oil, sewage, high temperature residue, slurry, caustic soda, asphalt, etc .; 6. High sensitivity, can measure small flow rate, flow rate can be as low as 0.08m / s; 7, for small diameter (DN15 ~ DN50), low Reynolds number (Red = 103 ~ 5 × 103) fluid, it can make up for occasions where standard throttling devices are difficult to apply, such as small-caliber steam flow measurement, etc .; 8. It can adapt to the measurement of high-parameter fluid, pressure Up to dozens of MPa, temperature up to 450 ℃; 9, can be used for the measurement of two-way flowing fluid; 10, low pressure loss, about half of the standard orifice plate; 11, strong anti-interference ability of upstream choke, straight upstream pipe section Generally the length is 5-10D. 12. Dry (hanging weight) calibration can be adopted, which brings convenience to the user's periodic calibration. 13. Direct-reading meters do not require external energy, are clear, easy to operate, and can be output. Standard signal (pulse frequency or current signal); 14, high performance-price ratio Is affordable flow meter; 15, easy to install, easy to maintain.