Electromagnetic flowmeter capable of detecting high-frequency pulsating flow

Abstract

The utility model relates to the technical field of electromagnetic flow meters, in particular to an electromagnetic flow meter capable of detecting high-frequency pulsating flow, which comprises a measuring conduit, a lining is arranged on the inner side of the measuring conduit, an electrode is arranged on the inner side of the lining, an iron casing is arranged on the outer side of the measuring conduit, and a high-frequency coil is arranged on the inner side of the iron casing. The upper side of the iron shell is connected with a flow meter, the outer side of the flow meter is provided with a control button and a display, and the inner side of the flow meter is provided with a magnetic circuit module, a converter, a frequency converter, a flow acquisition module and a digital filtering module; high-frequency excitation real-time flow is collected through the flow collecting module, digital filtering processing is carried out through the digital filtering module, finally average flow processed through a filtering algorithm is displayed through a display screen, flow meter frequency output is compared with average flow output, equivalent pulse output and cumulant are compared with the real-time high-frequency flow, and the real-time high-frequency flow is obtained. And the high-frequency pulsating flow can be accurately and stably detected.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic flowmeters, in particular to an electromagnetic flowmeter capable of detecting high-frequency pulsating flow. Background Art

[0002] Electromagnetic flowmeters can measure pulsating flow, which requires the pulsating frequency to be much lower than the excitation frequency. The maximum excitation frequency of general electromagnetic flowmeters is 12.5Hz or 25Hz. When measuring pulsating flow, pulsating flow at frequencies below 2Hz can be measured. However, in order to make the output of the electromagnetic flowmeter more stable, the output of the general electromagnetic flowmeter is the averaged value, which is generally calculated once every 1 to 2 seconds, and the display and output values ​​are updated once. Sometimes, filtering algorithms such as arithmetic mean, first-order low-pass, and Kalman filtering are also added. These operations will cause output hysteresis and cannot reflect the flow characteristics of high-frequency pulsating flow in real time. Utility Model Content

[0003] The utility model aims to solve the shortcomings in the prior art and proposes an electromagnetic flowmeter capable of detecting high-frequency pulsating flow.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An electromagnetic flowmeter capable of detecting high-frequency pulsating flow comprises a measuring conduit, a lining is provided on the inner side of the measuring conduit, an electrode is provided on the inner side of the lining, an iron shell is provided on the outer side of the measuring conduit, and a high-frequency coil is provided on the inner side of the iron shell; a flowmeter is connected to the upper side of the iron shell, a control button and a display are provided on the outer side of the flowmeter, and a magnetic circuit module, a converter, a frequency converter, a flow acquisition module and a digital filtering module are provided on the inner side of the flowmeter.

[0006] Preferably, the measuring tube is made of stainless steel.

[0007] Preferably, the surface of the high-frequency coil is wrapped with an insulating layer, and the high-frequency coil is evenly arranged between the inner wall of the iron shell and the outer wall of the measuring tube.

[0008] Preferably, the magnetic circuit module and the frequency converter are electrically connected to the high-frequency coil.

[0009] Preferably, the converter and the flow collection module are electrically connected to the electrodes.

[0010] Preferably, the digital filtering module is electrically connected to the flow collection module, and the display is provided with two groups.

[0011] The beneficial effects of the utility model are:

[0012] Compared with the prior art, the utility model collects high-frequency excitation real-time flow through the flow acquisition module, and performs digital filtering processing on the digital filtering module, and finally displays the average flow after filtering algorithm processing through the display screen, the flow meter frequency output is compared with the average flow output, the equivalent pulse output and the cumulative amount refer to the real-time high-frequency flow, and the high-frequency pulsating flow is accurately and stably detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a three-dimensional structural schematic diagram of an electromagnetic flowmeter capable of detecting high-frequency pulsating flow proposed by the utility model;

[0014] Figure 2 The utility model discloses an electromagnetic flowmeter capable of detecting high-frequency pulsating flow.

[0015] In the figure: 1. flow meter; 2. control button; 3. measuring tube; 4. lining; 5. electrode; 6. iron shell; 7. display. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0017] Reference Figure 1-2 , an electromagnetic flowmeter capable of detecting high-frequency pulsating flow, comprising a measuring conduit 3, the measuring conduit 3 is made of non-magnetic stainless steel, a lining 4 is arranged on the inner side of the measuring conduit 3, the lining 4 is made of insulating material, the corrosion resistance of the measuring conduit 3 is increased, and the induced potential is prevented from being short-circuited by the metal measuring conduit 3 wall, the lining 4 is mostly made of corrosion-resistant, high-temperature-resistant, wear-resistant polytetrafluoroethylene plastic or ceramic, an electrode 5 is arranged on the inner side of the lining 4, and an induced potential signal proportional to the measured value is drawn out, the electrode 5 is generally made of non-magnetic stainless steel, and is flush with the lining 4, so that the fluid can flow stably, an iron shell 6 is arranged on the outer side of the measuring conduit 3, a high-frequency coil is arranged on the inner side of the iron shell 6, the surface of the high-frequency coil is wrapped with an insulating layer, the high-frequency coil is evenly arranged between the inner wall of the iron shell 6 and the outer wall of the measuring conduit 3, the iron shell 6 distributes the high-frequency coil and isolates the interference of the external magnetic field;

[0018] The flow meter 1 is connected to the upper side of the iron shell 6, the control button 2 and the display 7 are arranged on the outside of the flow meter 1, and the magnetic circuit module, the converter, the frequency converter, the flow acquisition module and the digital filter module are arranged on the inside of the flow meter 1.

[0019] The magnetic circuit module and the frequency converter are electrically connected to the high-frequency coil. The frequency converter can increase the frequency of the input high-frequency coil current, thereby generating a high-frequency electromagnetic field. The converter and the flow acquisition module are electrically connected to the electrode 5. The flow acquisition module can obtain the induced voltage of the water flow through the channel by collecting the voltage between the two electrodes 5, and then infer the flow through the channel through this data. The digital filter module is electrically connected to the flow acquisition module. The display 7 is provided with two groups, which are respectively used to display the real-time flow curve display and the instantaneous flow display.

[0020] The induced potential signal generated by the liquid flow is very weak and is greatly affected by various interference factors. The role of the converter is to amplify the induced potential signal and convert it into a unified standard signal and suppress the main interference signal. Its task is to convert the induced potential signal detected by the electrode 5 into a unified standard DC signal after amplification. The flow acquisition module collects the real-time flow of high-frequency excitation, and converts the electrical signal into a digital signal, which is sent to the display 7 for cumulative amount calculation and display and pulse output, and is sent to the digital filter module for digital communication output and frequency output. It can reflect the flow characteristics of high-frequency pulsating flow in real time, calculate the flow in each cycle, display the flow curve on the display screen, and output the flow curve through 4-20mA current;

[0021] The screen displays the average flow after filtering algorithm processing, the frequency output of flowmeter 1 is compared with the average flow output, and the equivalent pulse output and cumulative amount refer to the real-time high-frequency flow.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electromagnetic flowmeter capable of detecting high-frequency pulsating flow, comprising a measuring conduit (3), characterized in that: The measuring conduit (3) is provided with a lining (4) on the inner side, an electrode (5) is provided on the inner side of the lining (4), an iron shell (6) is provided on the outer side of the measuring conduit (3), and a high-frequency coil is provided on the inner side of the iron shell (6); The upper side of the iron shell (6) is connected to a flow meter (1), the outer side of the flow meter (1) is provided with a control button (2) and a display (7), and the inner side of the flow meter (1) is provided with a magnetic circuit module, a converter, a frequency converter, a flow acquisition module and a digital filter module.

2. The electromagnetic flowmeter capable of detecting high-frequency pulsating flow according to claim 1, characterized in that: The measuring conduit (3) is made of stainless steel.

3. The electromagnetic flowmeter capable of detecting high-frequency pulsating flow according to claim 1, characterized in that: The surface of the high-frequency coil is wrapped with an insulating layer, and the high-frequency coil is evenly arranged between the inner wall of the iron shell (6) and the outer wall of the measuring conduit (3).

4. The electromagnetic flowmeter capable of detecting high-frequency pulsating flow according to claim 1, characterized in that: The magnetic circuit module and the frequency converter are electrically connected to the high-frequency coil.

5. The electromagnetic flowmeter capable of detecting high-frequency pulsating flow according to claim 1, characterized in that: The converter and the flow collection module are electrically connected to the electrode (5).

6. The electromagnetic flowmeter capable of detecting high-frequency pulsating flow according to claim 1, characterized in that: The digital filtering module is electrically connected to the flow collection module, and the display (7) is provided with two groups.

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