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A metering signal detection pickup amplifier applied to impeller flowmeter

A signal detection and flowmeter technology, applied in the detection field, can solve the problems of unfavorable impeller small flow measurement and flow expansion and transient response, poor anti-vibration and anti-interference ability of amplifier, poor anti-interference ability, etc., to improve accuracy And linear flow range, improve accuracy and linear flow range, the effect of super load capacity

Active Publication Date: 2021-04-02
威海市康华电子设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] First, the sensitivity of conventional sensors of this type is low, and the distance to detect turbine blades often exceeds the limit, especially the small-caliber flowmeter has a large curvature of the tube wall, and the distance between the magnetic surface of the impeller and the detection head of the amplifier increases, and the impeller with the same flow rate cannot be picked up linearly The rotating signal causes the actual signal to be lost; secondly, the anti-vibration and anti-interference ability of the amplifier is poor. The comprehensive anti-interference ability of amplifiers currently used in the industry is generally too poor, and it is easy to be replaced by frequency converters and AC contactors installed together under the same working conditions. , electromagnetic valve, motor and other inductive load interference, causing the amplifier to be disturbed and output invalid signals; similar amplifiers have strong magnetism, which is not conducive to small flow measurement of the impeller and expansion of the linear range of flow and transient response

Method used

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  • A metering signal detection pickup amplifier applied to impeller flowmeter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: See figure 1 , a metering signal detection pick-up amplifier applied to impeller flowmeters, including a housing 2; the housing 2 is designed with a standard 304 stainless steel waterproof housing, with all welded leads and no connectors to ensure safe and reliable performance. The inside of the body 2 is provided with a core amplifier board 7, and the top of the core amplifier board 7 is connected with 3 signal leads 8, and the top of the core magnetic induction sensor is provided with a one-way magnetic cover 3, and a rare earth permanent magnet is provided under the one-way magnetic cover 3 9. A reluctance coil 10 is provided under the rare earth permanent magnet 9, and an optimized magnetizer 4 is provided inside the reluctance coil. The top of the housing 2 is equipped with a metal waterproof Glen 1. Through the above design, the core induction components of this design are small in size (currently, the volume of similar products is 6-8 times that of th...

Embodiment 2

[0018] Embodiment 2, on the basis of Embodiment 1, the casing 2 is installed above the turbine casing 12 . The interior of the turbine casing 12 is provided with a leading body 6 and a rear guiding body 13 , and an impeller 11 is arranged in the middle of the leading body 6 and the rear guiding body 13 . The left and right ends of the impeller 11 are respectively fixed inside the grooves 5 of the leading body 6 and the rear guiding body 13 . It is designed to be close to the vane 11 of the flowmeter, which greatly reduces the probability of being interfered by external stray signals; the amplifier has no strong magnetism, and is a micro-magnetic induction, which has the least magnetic interference on the speed of the impeller 11 and is almost unaffected. The linear measurement range and accuracy of the impeller type flowmeter are improved.

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Abstract

The invention discloses a measurement signal detection and pickup amplifier applied to an impeller flowmeter. The measurement signal detection and pickup amplifier comprises a shell. A core amplification plate is arranged inside the shell. A core magnetoresistive induction sensor is arranged below the core amplification plate. A one-way magnetic conductive cover is arranged at the top of the sensor. A rare earth permanent magnet is arranged below the one-way magnetic conductive cover. The measurement signal detection and pickup amplifier has the beneficial effects that 1, the sensitivity is high and the detection distance is long; 2, the anti-seismic and anti-interference capacity is extremely high, and the core amplification plate with three-stage noise reduction optimization makes the interference signal adjustable and controllable, which is several times higher than that of the same period of the previous year; 3, the core magnetizer and the magnetoresistive structure are optimized, the direction of the magnetic force bundles is regularized, the disturbed area of the N-fold magnetic field is reduced, the structure is precise, small in volume and micro-magnetic (the volume is 6-8 times smaller than that of the previous year), the accuracy and the linear flow range of the current turbine flowmeter can be greatly enhanced and improved, the structural layout is reasonable and the stray signal interference of the magnetoresistive coil can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of detection, in particular to a metering signal detection pickup amplifier applied to impeller flowmeters. Background technique [0002] In the existing metering industry, the application of impeller flowmeters often causes inaccurate metering. After analyzing the reasons, when other working conditions are determined, the main reasons for the inaccurate metering are: [0003] First, the sensitivity of conventional sensors of this type is low, and the distance to detect turbine blades often exceeds the limit, especially the small-caliber flowmeter has a large curvature of the tube wall, and the distance between the magnetic surface of the impeller and the detection head of the amplifier increases, and the impeller with the same flow rate cannot be picked up linearly The rotating signal causes the actual signal to be lost; secondly, the anti-vibration and anti-interference ability of the amplifier is poor. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/20
CPCG01F1/20
Inventor 董自亮
Owner 威海市康华电子设备有限公司