CN-115683247-B - Magnetic induction flow measuring method and measuring instrument

CN115683247BCN 115683247 BCN115683247 BCN 115683247BCN-115683247-B

Abstract

The invention discloses a magnetic induction flow measurement method and a magnetic induction flow measurement instrument, wherein the magnetic induction flow measurement instrument comprises a measurement cavity tube, a measurement instrument module, a descaling circuit module, an input end electric control valve and an output end electric control valve which are connected with two ends of the measurement cavity tube, the measurement instrument module comprises an excitation coil and an electrode terminal, the excitation coil is used for providing a magnetic field for the measurement cavity tube, the electrode terminal comprises two optional passages outside the measurement cavity tube, the two optional passages comprise a first optional passage connected with the measurement instrument module and a second optional passage connected with the descaling circuit module, the first optional passage is used for forming a conductive passage with fluid in the measurement cavity tube to measure a voltage signal, and the second optional passage is used for removing a scale layer on the electrode terminal by utilizing electrolyte in the measurement cavity tube in an electrolysis mode.

Inventors

XIANG BIAO
LEI JINCHUN
LUO YUBIAO
XIA YUECHUN

Assignees

深圳市柯雷科技开发有限公司

Dates

Publication Date: 20260512
Application Date: 20221031

Claims (10)

1. The magnetic induction flow measuring instrument is characterized by comprising a measuring cavity tube, a measuring instrument module, a descaling circuit module, an input end electric control valve and an output end electric control valve which are connected to two ends of the measuring cavity tube, wherein the measuring instrument module comprises an excitation coil and an electrode terminal; The electrode terminal comprises a two-path selectable passage outside the measuring cavity tube, wherein the two-path selectable passage comprises a first selectable passage connected with the measuring instrument module and a second selectable passage connected with the descaling circuit module, the first selectable passage is used for forming a conductive passage with fluid in the measuring cavity tube to measure a voltage signal, and the second selectable passage is used for removing a scaling layer on the electrode terminal by utilizing electrolyte in the measuring cavity tube in an electrolysis way; The measuring cavity tube is communicated with the input end electric control valve and connected with a first branch tube, and the first branch tube is sequentially connected with an electrolyte valve, an electrolyte pump and an electrolyte tank; The magnetic induction flow measuring instrument also comprises a main controller, wherein the main controller comprises a time point response module, an electrolyte feeding module, a first flow value measuring module, a first flow value judging module, an electrifying descaling module, a descaling operation closing module and a fluid recovering measuring module; The time point response module is used for closing an input end electric control valve and an output end electric control valve of the magnetic induction flow measuring instrument in response to the descaling time point; the electrolyte feeding module is used for opening an electrolyte valve and a waste valve of the magnetic induction flowmeter, starting an electrolyte pump of the magnetic induction flowmeter and continuously discharging electrolyte into a measuring cavity pipe of the magnetic induction flowmeter at a first power, wherein the electrolyte and the fluid remained in the measuring cavity pipe are discharged from the waste tank; The first flow value measuring module is used for controlling the magnetic induction flow measuring instrument to measure a first flow value after the electrolyte is constantly discharged from the measuring cavity tube or the electrolyte pump continuously works for a preset first time period; The first flow value judging module is used for judging whether the first flow value is in a first preset flow value range, if the first flow value is in the first preset flow value range, the electrode terminal is qualified, no descaling operation is needed, and otherwise, the electrified descaling module executes the descaling operation; The electrified descaling module is used for closing the electrolyte pump, the electrolyte valve and the waste valve, opening the descaling circuit module and continuously electrifying the electrode terminal to perform descaling operation; the descaling operation closing module is used for closing the descaling circuit module after the descaling operation is completed, opening the waste valve and the input end electric control valve, and discharging the electrolyte in the measuring cavity tube into a waste tank by using the fluid; And the recovery fluid measurement module is used for opening the output end electric control valve, closing the waste valve and recovering the flow measurement of the fluid.
2. The magnetic-inductive flowmeter of claim 1, further comprising a set descaling period module and a descaling time point acquisition module that operate before the time point response module operates; The scale removal period setting module is used for setting a scale removal period according to the scaling time of the electrode; the descaling time point obtaining module is used for obtaining the descaling time point according to the set descaling period.
3. The magnetic induction flowmeter of claim 1, wherein the energized descaling module comprises a second flow value acquisition module and a second flow value determination module; The second flow value acquisition module is used for acquiring a second flow value according to the first voltage signal detected by the electrode terminal; The second flow value judging module is used for judging whether the second flow value of the electrode terminal in the electrified state is in the first preset flow value range, if the second flow value is in the first preset flow value range, the descaling circuit module is closed, and otherwise, the descaling circuit module is kept open.
4. The apparatus according to claim 1, wherein the descaling operation closing module comprises a third flow rate value obtaining module and a third flow rate value judging module; The third flow value acquisition module is used for acquiring a third flow value according to the second signal voltage detected by the electrode; The third flow value judging module is configured to judge whether the third flow value is within a second preset flow value range, if the third flow value is within the second preset flow value range, stop the fluid from being discharged into the waste tank, otherwise, continuously discharge the fluid into the waste tank.
5. The magnetic induction flowmeter of claim 1, wherein the magnetic field provided by the exciting coil is a uniformly distributed constant magnetic field, and the input end electric control valve, the output end electric control valve, the electrolyte valve and the waste valve are controlled by an electric control device.
6. A method for magnetic induction flow measurement, characterized in that the method is based on a magnetic induction flow meter as provided in any one of claims 1-5, the method comprising a detection operation step, a descaling operation step; the detection operation steps comprise: Step S1, closing an input end electric control valve and an output end electric control valve of the magnetic induction flowmeter in response to the descaling time point; S2, opening an electrolyte valve and a waste valve of the magnetic induction flowmeter, starting an electrolyte pump of the magnetic induction flowmeter and continuously discharging electrolyte into a measuring cavity tube of the magnetic induction flowmeter at a first power, wherein the electrolyte and the fluid remained in the measuring cavity tube are discharged from the waste tank; step S3, after the electrolyte is constantly discharged from the measuring cavity tube or the electrolyte pump continuously works for a preset first time period, controlling the magnetic induction flowmeter to measure a first flow value; Step S4, judging whether the first flow value is in a first preset flow value range, if so, the electrode terminal is qualified, no descaling operation is needed, and otherwise, the descaling operation step is carried out; The descaling operation steps comprise: S5, closing the electrolyte pump, the electrolyte valve and the waste valve, opening a descaling circuit module of the magnetic induction flowmeter and continuously electrifying the electrode terminal to execute descaling operation; s6, after the descaling operation is completed, closing the descaling circuit module, opening the waste valve and the input end electric control valve, and discharging the electrolyte in the measuring cavity tube into a waste tank by using the fluid; And S7, opening an output end electric control valve, closing the waste valve, and recovering the flow measurement of the fluid.
7. The method of magnetic induction flow measurement according to claim 6, characterized in that before said step S1, the method further comprises: Step A, setting a descaling period according to the scaling time of the electrode; And B, obtaining the descaling time point according to the set descaling period.
8. The method of magnetic induction flow measurement according to claim 6, wherein step S5 comprises: step S501, obtaining a second flow value according to the first voltage signal detected by the electrode terminal; Step S502, judging whether the second flow value of the electrode terminal in the electrified state is in the first preset flow value range, if so, closing the descaling circuit module, otherwise, keeping opening the descaling circuit module.
9. The method of magnetic induction flow measurement according to claim 6, wherein step S6 comprises: step S601, obtaining a third flow value according to the second signal voltage detected by the electrode; step S602, judging whether the third flow rate value is in a second preset flow rate value range, if the third flow rate value is in the second preset flow rate value range, stopping discharging the fluid into the waste tank, otherwise, continuously discharging the fluid into the waste tank.
10. The method of claim 6, wherein the magnetic field provided by the exciting coil is a uniformly distributed constant magnetic field, and the input end electric control valve, the output end electric control valve, the electrolyte valve and the waste valve are controlled by an electric control device.

Description

Magnetic induction flow measuring method and measuring instrument Technical Field The invention relates to the field of magnetic induction type flow measuring instruments for measuring flow of conductive media, in particular to a magnetic induction flow measuring method and a magnetic induction type flow measuring instrument. Background Magnetic induction flow meters are new flow meters that have rapidly developed in the 50-60 s of the 20 th century with the development of electronic technology. The magnetic induction flowmeter is one kind of electromagnetic induction instrument for measuring the flow of conducting fluid based on the electromotive force induced by the conducting fluid through the externally applied magnetic field. The magnetic induction flowmeter of the prior art is used for measuring flow for a long time, and the electrodes of the magnetic induction flowmeter are adhered by impurities in a pipeline, so that the flow measurement result of the magnetic induction flowmeter is affected. Disclosure of Invention The research of the applicant finds that the magnetic induction flow measuring instrument in the prior art is subjected to long-time flow measurement, the inner wall of the magnetic induction flow measuring instrument is easy to generate scaling phenomenon, an electrode is adhered by impurities on the inner wall, the magnetic induction flow measuring instrument cannot work normally, and a scaling layer attached to the inner wall of the magnetic induction flow measuring instrument needs to be detached, cleaned and then installed, so that more time is consumed. In view of the above-mentioned drawbacks of the prior art, the present invention provides a magnetic induction flow measurement method and a magnetic induction flow measurement apparatus, which aims to remove an adhesion scaling layer on an inner wall of a magnetic induction flow measurement apparatus without disassembling the magnetic induction flow measurement apparatus, thereby avoiding affecting the normal operation of the magnetic induction flow measurement apparatus. In order to achieve the above purpose, the first aspect of the invention discloses a magnetic induction flow measuring instrument, which comprises a measuring cavity tube, a measuring instrument module, a descaling circuit module, an input end electric control valve and an output end electric control valve which are connected with two ends of the measuring cavity tube, wherein the measuring instrument module comprises an excitation coil and an electrode terminal; The electrode terminal comprises a two-path selectable passage outside the measuring cavity tube, wherein the two-path selectable passage comprises a first selectable passage connected with the measuring instrument module and a second selectable passage connected with the descaling circuit module, the first selectable passage is used for forming a conductive passage with fluid in the measuring cavity tube to measure a voltage signal, and the second selectable passage is used for removing a scaling layer on the electrode terminal by utilizing electrolyte in the measuring cavity tube in an electrolysis way; The measuring cavity tube is communicated with the input end electric control valve and connected with a first branch tube, and the first branch tube is sequentially connected with an electrolyte valve, an electrolyte pump and an electrolyte tank; The magnetic induction flow measuring instrument also comprises a main controller, wherein the main controller comprises a time point response module, an electrolyte feeding module, a first flow value measuring module, a first flow value judging module, an electrifying descaling module, a descaling operation closing module and a fluid recovering measuring module; the time point response module is used for closing an input end electric control valve and an output end electric control valve of the magnetic induction flowmeter in response to the descaling time point; The electrolyte module is used for opening an electrolyte valve and a waste valve of the magnetic induction flowmeter, starting an electrolyte pump of the magnetic induction flowmeter and continuously discharging electrolyte to a measuring cavity pipe of the magnetic induction flowmeter at a first power, wherein the electrolyte and the fluid remained in the measuring cavity pipe are discharged from the waste tank; the first flow value measuring module is used for controlling the magnetic induction flow measuring instrument to measure a first flow value after the electrolyte is constantly discharged from the measuring cavity tube or the electrolyte pump continuously works for a preset first time period; The first flow value judging module is used for judging whether the first flow value is in a first preset flow value range, if the first flow value is in the first preset flow value range, the electrode terminal is qualified, descaling operation is not needed, and otherwise, the electrified descaling mo