Right-angle high-pressure electromagnetic flow meter

Abstract

The invention relates to a right-angle high-pressure electromagnetic flow meter which comprises a flow meter shell, a sealing end cap connected with the flow meter shell, a connection base and an electromagnetic flow converter. A metering cavity is arranged in the flow meter shell, and the connection base is respectively connected with the sealing end cap and the electromagnetic flow converter. The flow meter is characterized in that an electromagnetic flow sensor is further included and is located in the metering cavity, the electromagnetic flow sensor comprises a sensor shell, a measurement electrode, an excitation coil and a magnetic yoke, the measurement electrode is embedded into the outer wall of the sensor shell, the excitation coil and the magnetic yoke are located on the inner wall of the sensor shell, and the excitation coil and the magnetic yoke are connected with the electromagnetic flow converter through cables. The right-angle high-pressure electromagnetic flow meter has the advantages that the Faraday electromagnetic induction principle is adopted, the induction signal amplitude and the fluid flow speed are in direct proportion, the structure is simple, movable components do not exist, the service life is long, maintenance load is little, linear flow measurement is achieved, non-linear revision is not needed, measurement precision is high and the flow range is wide.

Description

technical field [0001] The invention relates to a measuring tool, in particular to a right-angle high-voltage electromagnetic flowmeter. Background technique [0002] High-voltage electromagnetic flowmeter is composed of high-pressure electromagnetic flow sensor and intelligent converter produced by proprietary technology and special process. It is specially used for geology, oil exploration, and oil field systems to measure mud, cement slurry, and high-pressure water injection under high-pressure conditions. Liquid or liquid-solid two-phase medium volume flow. [0003] There are two types of flowmeters on the market: [0004] The first type, the right-angle high-pressure impeller flowmeter adopts the impeller rotation structure. This structure utilizes the principle that the angular velocity is proportional to the flow velocity when the impeller rotates. The rotation of the impeller transmits the magnetic force to the central magnetic steel gear of the indication device o...

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Problems solved by technology

[0004] The first type, the right-angle high-pressure impeller flowmeter adopts the impeller rotation structure. This structure utilizes the principle that the angular velocity is proportional to the flow velocity when the impeller rotates. The rotation of the impeller transmits the magnetic force to the central magnetic steel gear of the indication device on the upper side of the partition through the ring-shaped magnetic steel at the upper end of the impeller shaft, and the reduction gear drives the character wheel to display the cumulative flow rate; this structure has the following disadvantages: 1. It is easy to be dirty by the fluid medium The impact of pollution will cause the impeller to be stuck, which will cause the instrument to fail to be used; 2. During long-term use, due to the wear of the rotating parts, the dynamic balance of the rotating mechanism will change, which will change the measurement characteristics, and the accuracy and sensitivity of the measurement cannot be guaranteed. In severe cases The instrument cannot be used due to failure; 3. The rotating mechanism is a movable part with short service life and large maintenance; 4. Low measurement accuracy (level 2.0) and small range ratio (10:1)

Within a certain range of Reynolds number, the frequency of vortex occurrence is proportional to the fluid velocity; this structure has the following disadvantages: 1. It is easily affected by the contamination of the fluid medium to cause vortex disorder, and the magnetoelectric conversion signal is also easily affected by on-site noise and pipelines. Vibration interference cannot guarantee the accuracy and sensitivity of measurement; 2. The upper limit frequency is low, which makes the frequency range narrow, and multi-point flow nonlinear correction is required; 3. Due to the limitation of the Reynolds number range, the small flow signal frequency is low, and the measurement accuracy is affected. The range ratio is small (20:1); 4. During long-term use, the vortex generating body changes due to stress and the permanent magnet changes due to magnetic field, which changes the measurement characteristics and affects the accuracy and sensitivity of measurement.

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