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Double-rotor flowmeter

LXZ series double rotor flowmeter (hereinafter referred to as flowmeter) is the ideal generation of …

I. Product Overview:

LXZ series double rotor flowmeter (hereinafter referred to as flowmeter) is the ideal generation of volumetric flowmeter in China. It is a new volumetric flowmeter designed and assembled by precision machining. A pair of spiral rotors is the moving body in the measuring chamber, which plays the role of dividing, measuring, transporting and discharging the measured liquid. This type of flowmeter adds a positioning gear in the structure, so that the two rotors do not touch each other when rotating. The flowmeter works smoothly, low noise, less wear, high accuracy, viscosity adaptability, can allow the fine particles in the measured liquid through, so it is not easy to jam the meter. The flowmeter is treated by electroless nickel plating, so it has the characteristics of anti-corrosion and wear resistance, and can replace stainless steel flowmeter.

Ii. Structure principle:

1. Principle:

The measurement of fluid flow rate by LXZ series double rotor flowmeter is completed in the metering chamber. A pair of helical rotors rotate under the pressure of the liquid, and the closed space formed between the rotor and the metering chamber wall (the shaded part of the figure) displaces 8 times the shadow volume per rotation. Therefore, according to this relationship, as long as the number of rotations of the rotor is measured, the flow accumulation can be calculated, and according to the revolutions per second, the instantaneous flow can be measured.

2. Structure:

The double rotor is mainly composed of housing, a pair of spiral rotors, magnetic coupling, reduction mechanism, adjusting gear, counter and transmission device. The body of the flowmeter is divided into two types: monomer and double body. The monomer is the shell and the flowmeter box; The double body means that the shell and the flowmeter are two bodies. The rotational speed of the helical rotor is transmitted to the head counter through a magnetic coupling and a series of gear reduction mechanism. Magnetic coupling is mainly composed of active and driven magnetic steel. Magnetic coupling can improve the flow meter's working pressure and temperature, safe operation, easy maintenance.

Three, application:

LXZ series double rotor flowmeter is a precision instrument for measuring and controlling liquid flow in pipeline. Widely used in petroleum, chemical industry, metallurgy, electric power, transportation, shipbuilding, oil depot, wharf, tank trucks and other departments, especially suitable for crude oil, refined oil, light hydrocarbons and other industrial liquid measuring flowmeter can live instructions, word direct reading and issuing unit, the output electrical pulse signal, far to the secondary instrument or computer, automatic control, automatic detection and data processing system.

Iv. Main Features:

1, high accuracy, good repeatability, balanced operation, no pulsation and long life;

2, flowmeter before and after no straight pipe section, small installation space;

3, flow accuracy is not affected by pressure and flow changes, stable performance;

4, with temperature and pressure sensor, temperature and pressure compensation of gas;

5, with pulse signal, analog signal, through RS485 interface to achieve centralized and real-time management of computer data;

6, low power consumption, can be internal battery power supply, also can be connected to external power supply;

7, high resolution special LCD screen, intuitive and convenient reading.

Five, technical parameters:

1. Measurable liquid petroleum, petroleum products, chemical media, etc.;

2, nominal diameter (mm) 10, 15, 25, 40, 50, 80, 100, 150, 200, 250, 300;

3, accuracy (%) 0.1, 0.2, 0.5;

4, pressure loss 0.3-mpa. s <40KPa;

5. Working pressure (MPa) 1.6, 2.5, 4.0, 6.3;

6, temperature range (℃) -20 ~ +60, -20 ~ +120, +100 ~ +200, +150 ~ +250;

7, protection grade IP65;

8, ambient temperature (-30 ~ +70℃);

9, medium viscosity (0.32 ~ 1000Mpa.SMPA.s);

Six, installation requirements:

1. Environmental conditions: no corrosive fluid around, small mechanical vibration, less dust and away from heat sources. For intelligent flowmeter with volume correction instrument, there should be a specified environment.

2, ambient temperature: generally not more than -20 - +8O℃ range.

3. Pipeline conditions: Before installing the flowmeter, the pipeline must be cleaned and purged to remove all sundries, rust and dirt. The connecting pipe should be coaxial with the inlet and outlet of the flowmeter, and no protruding objects protruding from the pipe wall should be protruded into the pipe. The flowmeter should be installed without stress, fully considering the pipeline stress caused by working temperature.

As a new volumetric flowmeter, only by meeting its working conditions and correctly using according to the requirements, can make use of its ideal cost performance and prolong its service life. Therefore, the following three problems should be paid attention to in selection and use.

1, because of the single shell structure, the highest pressure is not higher than 2.0mpa, so the high pressure long distance pipeline should not be used.

2. When used again in non-continuous use, the air in the measuring chamber must be drained from the exhaust hole to prevent the cavitation from increasing the measurement error and graphite bearing damage.

3, the rotor clearance is not higher than 0.2μm, and the medium in the measuring chamber stroke is longer, the purity of the measuring medium is higher than other volumetric flowmeter, the use of stainless steel filter not less than 40 purposes and regular cleaning. The rotor is made of cast iron, and the moisture content of the medium is not higher than 5%, otherwise it will rust and affect the use.

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