CN104266694A - An intelligent electromagnetic flowmeter for measuring slurry - Google Patents

Abstract

The invention discloses an intelligent electromagnetic flowmeter for measuring slurry, which comprises: the invention can measure the flow of the slurry which can only generate weak signals by amplifying the signals through the amplifying circuit, and filter the output of the signal amplifying circuit through the filter circuit, thereby reducing the influence of interference noise and improving the measurement precision and reliability of the electromagnetic flowmeter; the conductivity of the fluid is measured by the conductivity measuring probe, and the flow data in the microprocessor is adjusted in time, so that the flow of the fluid is calculated in real time, and the flexibility of the electromagnetic flowmeter is improved.

Description

An intelligent electromagnetic flowmeter for measuring slurry

technical field

The invention relates to an intelligent electromagnetic flowmeter for measuring slurry.

Background technique

Electromagnetic flowmeter is a very mature flowmeter that occupies a dominant position in flowmeters at home and abroad. Its technology has been continuously updated and improved for decades, and its manufacturing process has been continuously improved. It has been widely used in tap water, environmental protection, petrochemical, metallurgical power, food and medicine and other fields. However, in some fields, such as papermaking, pulp, mud and other industries, due to the influence of working conditions such as solid-liquid two-phase medium, large density changes of the medium, large flow rate and low flow rate, the electromagnetic flowmeter The application has problems such as instability and inaccuracy. This topic has been the direction of concern and research by domestic and foreign counterparts. At present, the electromagnetic flowmeter produced in China has not yet solved the application problem of slurry medium measurement well, and only a few professional manufacturers abroad have successful precedents. the

The technical difficulty of the slurry type electromagnetic flowmeter is that the effective flow voltage signal collected by the flow sensor is very weak, especially at a low flow rate, there is only a few microvolts of effective voltage signal, and the accompanying electromagnetic interference signal and fluid noise influence The strength of the electromagnetic flowmeter is hundreds or even thousands of times of the effective signal. Due to the above technical difficulties, the current traditional electromagnetic flowmeter cannot be applied to the measurement of slurry fluid.

Contents of the invention

In order to overcome the deficiencies of the prior art, the invention provides an intelligent electromagnetic flowmeter for measuring slurry.

The technical solution adopted by the present invention to solve its technical problems is:

An intelligent electromagnetic flowmeter for measuring slurry, comprising:

Exciting coils arranged on the upper and lower sides of the measuring tube, the exciting coils provide a magnetic field to the inside of the measuring tube;

an excitation device, the excitation device is connected with the excitation coil, and provides an excitation current to the excitation coil;

An electrode, which is arranged on the left and right sides of the measuring pipe, is used to detect the current generated by cutting the magnetic field line by the flow in the measuring pipe;

A signal processing circuit, the signal processing circuit is connected to the electrodes, the signal processing circuit includes an amplifier circuit and a filter circuit, and the signal is output after passing through the amplifier circuit and the filter circuit in sequence;

an A/D converter connected to a signal processing circuit for converting an analog signal into a digital signal;

Conductivity measurement probe, the conductivity measurement probe is inserted into the measuring pipe fitting for measuring the conductivity of the fluid;

Microprocessor, the microprocessor is connected with A/D converter, conductivity measurement probe, and calculates the flow rate according to the data.

The A/D converter is an ICL7135 monolithic dual integral analog-to-digital converter from INTERSIL of the United States.

Described microprocessor is MSP430 one-chip computer of Hong Kong TI company or Holland PHILIPS company 80C552 one-chip computer.

The excitation device is a circuit composed of four power transistors that switches the direction of the excitation current and generates the alternating magnetic field required by the micro-flow electromagnetic flowmeter.

The microprocessor is also connected with an output device, which is a display.

The beneficial effects of the present invention are: the present invention amplifies the signal through the amplifying circuit, so that the present invention can measure the flow rate of the slurry that can only generate weak signals, and filter the output of the signal amplifying circuit through the filter circuit to reduce interference The influence of noise improves the measurement accuracy and reliability of the electromagnetic flowmeter of the present invention; The flexibility of electromagnetic flowmeter use.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of the structure of the present invention.

Detailed ways

With reference to Fig. 1, Fig. 1 is the structural principle diagram of a specific embodiment of the present invention, as shown in the figure, a kind of intelligent electromagnetic flowmeter for measuring slurry comprises:

The excitation coil 2 arranged on the upper and lower sides of the measuring tube, the exciting coil 2 provides a magnetic field to the inside of the measuring tube;

an excitation device, the excitation device is connected with the excitation coil, and provides an excitation current to the excitation coil;

Electrode 1, the electrode 1 is arranged on the left and right sides of the measuring pipe fitting, and is used to detect the current generated by cutting the magnetic force line of the flow in the measuring pipe fitting;

A signal processing circuit, the signal processing circuit is connected to the electrode 1, and the signal processing circuit includes an amplifier circuit and a filter circuit, and the signal is output after passing through the amplifier circuit and the filter circuit in sequence;

an A/D converter connected to a signal processing circuit for converting an analog signal into a digital signal;

Conductivity measuring probe 3, the conductivity measuring probe 3 extends into the measuring pipe fitting for measuring the conductivity of the fluid;

The microprocessor is connected with the A/D converter and the conductivity measuring probe 3, and calculates the flow rate according to the data.

The present invention amplifies the signal through the amplifying circuit, so that the present invention can measure the flow rate of the slurry that can only generate a weak signal, and filter the output of the signal amplifying circuit through the filter circuit to reduce the influence of interference noise and improve the present invention. The measurement accuracy and reliability of the electromagnetic flowmeter; and measure the conductivity of the fluid by the conductivity measuring probe, adjust the flow data in the microprocessor in time, calculate the fluid flow in real time, and improve the flexibility of the use of the electromagnetic flowmeter of the present invention .

Preferably, the A/D converter is an ICL7135 monolithic dual integral analog-to-digital converter from INTERSIL of the United States.

As preferably, described microprocessor is the MSP430 single-chip microcomputer of Hong Kong TI company or the 80C552 single-chip microcomputer of Holland PHILIPS company.

Preferably, the excitation device is a circuit composed of four power transistors that switches the direction of the excitation current and generates the alternating magnetic field required by the micro-flow electromagnetic flowmeter.

Preferably, the microprocessor is also connected with an output device, and the output device is a display.

The preferred implementation of the present invention has been described in detail above. Of course, the present invention can also adopt different forms from the above-mentioned embodiments. Those skilled in the art can make equivalent transformations or corresponding equivalents without violating the spirit of the present invention. Any changes should fall within the protection scope of the present invention.

Claims (5)

1. measure an intelligent electromagnetic flowmeter for slurries, it is characterized in that: comprising:

Be arranged on the magnetizing coil (2) measuring the upper and lower both sides of pipe fitting, this magnetizing coil (2) provides magnetic field to described measuring tube inside;

Magnetizer, this magnetizer is connected with magnetizing coil, and provides exciting curent to described magnetizing coil;

Electrode (1), this electrode (1) is arranged on measures the pipe fitting left and right sides, the electric current produced for detecting flow cutting magnetic line in measurement pipe fitting;

Signal processing circuit, this signal processing circuit is connected with electrode (1), and described signal processing circuit comprises amplifying circuit, filtering circuit, and signal exports successively after amplifying circuit, filtering circuit;

A/D converter, this A/D converter is connected with signal processing circuit, for being digital signal by analog-signal transitions;

Electric conductivity measuring probe (3), this electric conductivity measuring probe (3) stretches to be measured within pipe fitting, for measuring the conductance of fluid;

Microprocessor, this microprocessor and A/D converter, electric conductivity measuring are popped one's head in (3), and according to data calculated flow rate.

2. a kind of intelligent electromagnetic flowmeter measuring slurries according to claim 1, is characterized in that: described A/D converter is the ICL7135 monolithic dual integ ration ADC of American I NTERSIL company.

3. a kind of intelligent electromagnetic flowmeter measuring slurries according to claim 1, is characterized in that: described microprocessor is the MSP430 single-chip microcomputer of Hong Kong TI company or Dutch PHILIPS company 80C552 single-chip microcomputer.

4. a kind of intelligent electromagnetic flowmeter measuring slurries according to claim 1, is characterized in that: described magnetizer is the direction of the switching exciting curent be made up of 4 power transistors, produces the circuit of the alternating magnetic field needed for micrometeor electromagnetic flowmeter.

5. a kind of intelligent electromagnetic flowmeter measuring slurries according to claim 1, is characterized in that: described microprocessor is also connected with an output unit, and this output unit is a display.