CN205879281U

CN205879281U - A ground loop for electric -magnetic flow meter is last

Info

Publication number: CN205879281U
Application number: CN201620829711.4U
Authority: CN
Inventors: 陈佳; 唐杨成
Original assignee: SHANGHAI GUANGHUA INSTRUMENT CO Ltd
Current assignee: SHANGHAI GUANGHUA INSTRUMENT CO Ltd
Priority date: 2016-08-02
Filing date: 2016-08-02
Publication date: 2017-01-11
Anticipated expiration: 2026-08-02

Abstract

The utility model discloses a ground loop for electric -magnetic flow meter is last, including the ground loop body and extending the pipeline section, the one end of extending the pipeline section links in a side of ground loop body, and the internal diameter phase -match of the diameter of the inner ring of ground loop body and extension pipeline section. The utility model discloses can effectual dependable flow the straight tube section at the meter upper reaches bias flow does not take place, the center pin symmetry in flow field is not destroyed, can also make the fluid be close gently when being close measuring device, the lined not normal phenomenon of fluid impact measuring device who avoids machining error to arouse takes place, moreover has also guaranteed the uniformity of measuring device circulation latus rectum from the angle of processing.

Description

A kind of ground loop on electromagnetic flowmeter

Technical field

This utility model relates to Ferraris instrument parts, more particularly, it relates to a kind of connecing on electromagnetic flowmeter Ground ring.

Background technology

Electromagnetic flowmeter is a kind of based on Faraday law of electromagnetic induction, the sense produced by conductor fluid cutting magnetic line Answer electromotive force to measure the average speed in cross section, then according to bore (fixed value) and flow velocity, be converted into the sensing of volume flow Formula instrument.

Electromagnetic flowmeter is made up of sensor and the big parts of transducer two, and during measurement, transducer is responsible for providing to sensor Need exciting current, sensor excitation coil energising after, produce magnetic field, conducting medium flow through in sensor tube time Waiting, do the motion of cutting magnetic line and output induction electromotive force, the induction electromotive force of generation is examined by two electrodes of sensor Measure, feed back to transducer.

Under the conditions of flow velocity is with central shaft for symmetrical VELOCITY DISTRIBUTION, electromotive force E=BDV.Flow velocity is with stream substantially symmetrical about its central axis Dynamic, induction electromotive force is unrelated with velocity flow profile, is only proportional to mean flow rate.Fluid flows through the certain straight tube scope after choked flow piece In, there is nonaxisymmetrical Biased flow phenomenon in velocity profile.After the most considerably long straight length, VELOCITY DISTRIBUTION just can return to in Mandrel is symmetrical.Being shown by great many of experiments, general electromagnetic flowmeter upstream is still to the straight length requirement of 5～10 times of calibers.

In the occasion having ground loop requirement, above effusion meter, all can there is ground loop device (as shown in Figure 1).At ground loop Installation all can there is trace eccentric；Actual flow gauge is in doing the lining course of processing, to the compact dimensions producer after lining the most not Do strict requirements, it may appear that the deviation of positive negative direction, install ground loop this time, will by the passing hole of ground loop The non-axis symmetry volume Biased flow phenomenon in shakedown flow field, affects certainty of measurement；If the latus rectum compact dimensions after lining is less than normal, will While destroying the non-axis symmetry volume Biased flow phenomenon in flow field, fluid directly impacts lining corner, and permanent lining in the past reaches tired Labor limit product crackle, will occur seepage to cause effusion meter not work.

Utility model content

For drawbacks described above present in prior art, the purpose of this utility model is to provide a kind of for electromagnetic flowmeter On ground loop, it is possible to there is not bias current in the effective straight length ensureing effusion meter upstream, the substantially symmetrical about its central axis of flow field is not broken Bad.

For achieving the above object, this utility model adopts the following technical scheme that

A kind of ground loop on electromagnetic flowmeter, including ground loop body and extension pipeline section, extends one end of pipeline section It is connected in the one side of ground loop body, and the inner ring diameter of ground loop body matches with the internal diameter extending pipeline section.

The described height extending pipeline section is 15～40mm.

The described internal diameter extending pipeline section is that electromagnetic flowmeter internal diameter deducts the numerical value extending pipeline section height.

The described wall thickness extending pipeline section is 1.5～3mm.

Described extension pipeline section is connected with ground loop body by bolt.

Comprehensive above technical scheme, utilizes this utility model can effectively continue the substantially symmetrical about its central axis of flow field, expires The upstream straight length requirement of 5～10 times of foot electromagnetic flowmeter requirement, it is also possible to the most cost-effective, solves electromagnetic flowmeter In actual condition, due to the phenomenon of the media impingement ground loop that ground loop dimensional problem causes, thus preferably protective grounding Ring, extends electromagnetic flowmeter service life.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of existing ground loop；

Fig. 2 is the schematic diagram of this utility model structure；

Fig. 3 is the left view of a-a part in Fig. 2.

Detailed description of the invention

The technical solution of the utility model is further illustrated below in conjunction with the accompanying drawings with embodiment.

Incorporated by reference to shown in Fig. 2 to Fig. 3, a kind of ground loop on electromagnetic flowmeter provided by the utility model, bag Including ground loop body 1 and extend pipeline section 2, the one end extending pipeline section 2 is connected in the one side of ground loop body 1, and ground loop body 1 Inner ring diameter match with the internal diameter extending pipeline section 2, will extend over after pipeline section 2 is connected with the straight length of effusion meter upstream, energy Enough effective guarantee straight lengths will not occur bias current, and the substantially symmetrical about its central axis of flow field also will not be destroyed, and both can make stream Body is the most close close to measurement apparatus when, it is to avoid the fluid impact measurement apparatus lining that mismachining tolerance causes abnormal Phenomenon occurs, furthermore also ensure that the concordance of measurement apparatus circulation latus rectum from the angle of processing.

It is also preferred that the left the described height h1 extending pipeline section 2 is 15～40mm.

It is also preferred that the left the described internal diameter r extending pipeline section 2 is electromagnetic flowmeter internal diameter deducts the number extending pipeline section height h1 Value.

It is also preferred that the left the described wall thickness h2 extending pipeline section 2 is 1.5～3mm.

It is also preferred that the left described extension pipeline section 2 is linked together with ground loop body 1 by bolt.

In sum, size of the present utility model is counted as adapting to adjust according to on-the-spot actually used Electromagnetic Flow, it addition, This utility model can also be the most cost-effective, and solution electromagnetic flowmeter is in actual condition, due to ground loop dimensional problem The phenomenon of the media impingement ground loop caused, thus preferably protective grounding ring, extend the service life of electromagnetic flowmeter.

Those of ordinary skill in the art is it should be appreciated that above embodiment is intended merely to illustrate that this practicality is new Type, and it is not used as to restriction of the present utility model, as long as in spirit of the present utility model, to the above The change of embodiment, modification all will fall in Claims scope of the present utility model.

Claims

1. the ground loop on electromagnetic flowmeter, it is characterised in that: include ground loop body and extend pipeline section, extension One end of section is connected in the one side of ground loop body, and the inner ring diameter of ground loop body matches with the internal diameter extending pipeline section.

A kind of ground loop on electromagnetic flowmeter, it is characterised in that described extension pipeline section Height be 15～40mm.

A kind of ground loop on electromagnetic flowmeter, it is characterised in that described extension pipeline section Internal diameter be electromagnetic flowmeter internal diameter deduct extend pipeline section height numerical value.

A kind of ground loop on electromagnetic flowmeter, it is characterised in that described extension pipeline section Wall thickness be 1.5～3mm.

A kind of ground loop on electromagnetic flowmeter, it is characterised in that described extension pipeline section It is connected with ground loop body by bolt.