Cast iron double rotor flowmeter

Productoverview:

ZW-LXZ series Cast iron double rotor flowmeter It is developed a new type of volumetric flow meter. Used for precision measurement and control instrument of liquid flow in the pipeline. With high precision, stable operation, no pulse, low noise, long service life and strong adaptability to changes in viscosity characteristics. Flowmeter instructions, code direct reading. And can be equipped with photoelectric pulse converter output electric pulse (current) signal for display instrument and computer processing, automatic control, automatic detection and data processing system.

Two, structure principle:

1, principle:

ZW-LXZ series cast iron double rotor flowmeter for fluid flow measurement is completed in the measurement of cavity. A pair of spiral rotor rotating in the liquid under the pressure of a closed space is formed between the rotor and the measurement of cavity wall (Figure shadow) of each rotary a shadow volume discharge 8 times. According to this relationship, as long as the measurement of rotating frequency, we can calculate the flow accumulation, according to the second revolution, it can be used to measure the instantaneous flow.

2, structure:

Double rotor flowmeter is mainly composed of a casing, a pair of spiral rotor, magnetic coupling, reducer, gear adjustment, counter and signaling device. The body is divided into flowmeter monomer and dimer monomer. Both shell and box that flowmeter as a whole; the shell and the flowmeter for catamaran. Spiral rotor speed reducer. The mechanism of magnetic coupling and a series of gears, to meter counter. The magnetic coupling is mainly composed of a driving magnet and the driven magnetic steel. The magnetic coupling flowmeter can improve the working pressure and temperature, safe operation, convenient maintenance.

Third, application:

ZW-LXZ series cast iron double rotor flowmeter is used in pipeline liquid flow measurement and control instrument. Widely used in petroleum, chemical, metallurgy, electric power, transportation, shipbuilding, oil depots, docks, tankers and other departments, especially for the measurement of crude oil, refined oil, flowmeter in light hydrocarbon and other industrial liquids can be directly read the instructions, word and dispensing hearing, output electric pulse signal transmitted to the secondary instrument or computer composition, automatic control, automatic detection and data processing system.

Fourth, the main features:

1, suitable for thin oil, light oil, heavy oil, sａnd content and moisture content of crude oil, the measured liquid viscosity range.

2, through the liquid flow meter, flow rate is about the same size of ordinary volume table two times.

3, long service life, high accuracy, high reliability.

4, the pressure loss in the minimum.

5, cable transmission distance is 1000 meters, the output pulse signal of N=0.1L (a 1N pulse), can be directly with the computer network.

6, explosion-proof Ia II CT6 (safety); flameproof D II BT6 (flameproof protection); IP56.

Fifth, technical parameters:

1, can be measured in liquid petroleum, petroleum products, chemical medium etc.;

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

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

4 0.4-3 mPa.s <40KPa, pressure loss;

5, working pressure (MPa) 1.6, 2.5, 4.0, 6.3;

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

7, protection grade IP65;

8, environmental temperature (-30 ~ +70 C);

9, medium viscosity (0.32 ~ 1000mPa.smPa.s);

Installation requirements:

1, environmental conditions: no corrosive fluids, small mechanical vibration, less dust and place away from heat. For a volume correction instrument of intelligent flowmeter, should also comply with the provisions of the environment.

2, the ambient temperature: not more than -20, the range of +8O DEG C.

3 conditions: in the installation of pipeline flowmeter before pipeline should be cleaned and purge, remove all debris, rust and dirt. Connecting pipe should be in accordance with the import and export of the same caliber flowmeter axis, may not have bulges protruded convex wall in the pipeline. Flow meter should take the stress free installation, considering pipe work caused by temperature stress.

As a new type of flowmeter, only to meet the conditions and according to the requirements of the correct use, can make use of the ideal price, prolong the service life. Therefore must pay attention to the following 3 problems in the selection and use of.

1, because the single shell structure, high pressure is higher than that of 2.0MPa, so is the use of high-pressure long pipeline transportation.

2, non consecutive occasions when used again, must from the exhaust hole net metering cavity air to prevent cavitation caused by measuring error increases and graphite bearing damage.

3, the rotor clearance is not higher than 0.2 m, and the medium in the metering chamber to travel longer, the medium purity requirements than other volumetric flowmeter, requiring the use of not less than 40 to the stainless steel filter and regular cleaning. The rotor is cast iron, medium water requirement rate is less than 5%, otherwise it will affect the use of corrosion.

Seven, installation notes:

1, the installation direction should be the direction of the arrow shown on the instrument shell and liquid flow in the same direction, the installation position should pay attention to reading

2, try to install instruments in normal occasions, do not install in harmful gases and strong thermal radiation situations, to prevent damage to the counter part of instrument.

The rotor shaft 3, the instrument as much as possible to install the horizontal position, the dial should be installed into the vertical position ("0" in the above indexing), to reduce the friction between the gear and the shell, reducing the wear of parts. Due to the different installation positions, in order to facilitate the reading, the counter (header) rotating 90 degrees or 180 degrees. Electronic meter installation with vertical installation, head of state and at right angles to the body, easy to read.

Before installation, 4 meters, the pipeline must be cleaned thoroughly in the piping system, if there is no strict filtering device, filters should be installed in the instrument, to prevent impurities from entering the table.

5, should be installed in the pump outlet, the flow control valve should be installed in the instrument downstream, when used to open the upstream valve, then slowly open the downstream flow regulating valve or. Is suddenly turned on or off.

6, in the use of instruments, should be full of liquid flow in the table. Tested in vivo should not be mixed with gas, mixed volume measurement not otherwise measured air and liquid. The liquid is mixed in the gas must be installed in the instrument before gettering.

7, the flow of the pipeline should not dramatically increase or decrease, should be avoided and pressure piping vibration, hydraulic shock volatility phenomenon, otherwise it will affect the normal work of instruments.

8, the flow exceeds the specified Zui flow is large, with double rotor speed of wear increases, and the pressure loss increased sharply, should avoid the use of less than Zui, small flow, still can measure, but the error increases, the starting flow flowmeter is about Zui high flow 3%, normal workflow amount is Zui high flow 70%-80%.

9, for the measurement of high viscosity liquid, generally the liquid is heated to reduce viscosity, and flow in the pipe, when the instrument is disabled, liquid cooling instrument filled with the variable viscosity, such as to enable, must use steam or thermal oil in the body, the external heating liquid red hot method for liquid viscosity the instrument can be used after reduced. Otherwise the viscosity will bite the transmission parts, resulting in damage to the instrument.

10, the measured liquid temperature should not exceed the specified value, even more than the instrument gets stuck.The additional error can also cause changes in the temperature of the liquid viscosity influence. In addition, the temperature also caused an increase in spiral space volume increased, the instrument "go slow",

The factory 11, each meter, with diesel at room temperature under normal temperature calibration, oil density: 0.84M3/KG, such as liquid viscosity users and this difference is larger, can exchange the double gear or adjust the instrument coefficient to correct the error.

12, prohibit the use of purging steam and water through the instrument.

Eighth, structure and dimensions:

1, rotor structure

Rotor assembly

2, the overall structure of intelligent meter

The overall structure of intelligent meter:

Note: 1, 2., 3. and two times the battery meter table 4. connecting seat type 5.U 6. - 7. cap positioning 9.O type ring gear 8. on the cover 10. 11. 12. 13. of the main rotor shaft, the upper cover 14. thrust bearing 15. adjustment screws 16. bottom cover 17. remote.

Three Size, see table:

Nine, measuring range:

10, encoding selection:

Eleven, design selection and ordering instructions:

1, the name and type of flowmeter. Specification and material etc..

2, medium temperature (c) and pressure (Mpa), flow range (m3/h).

3, medium viscosity or medium name.

4, there are no special requirements (such as explosion-proof etc.).

5, you need a detailed understanding of the product, please call for information.

6, you need to display instrument Zhongwei control, please refer to the corresponding instructions, the appropriate choice of models or provided by the technical personnel of our company according to your information for your selection.

Customer service service commitment:

1, my company sold Zhongwei double rotor flowmeter series product quality problems within twelve months, responsible for free maintenance.

2, the warranty period if the products of our company have any quality problems, our company is responsible for free repair or replacement.

3, the warranty period if the user use undeserved, cause damage to the product, our company is responsible for the maintenance, collect the damaged parts cost.

4, after the warranty period of product quality problems, our company is responsible for the maintenance, collect the damaged parts cost.

5, if the user needs to our service, our company in the province of the user service personnel arrived at the scene within 12 hours, arrived at the scene 48 hours outside users.