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What is an oval gear flowmeter?

2023-10-20

Oval gear flowmeter (also known as displacement flowmeter, gear flowmeter) is a type of volumetric flowmeter, which is a type of flow meter with higher accuracy. It uses mechanical measuring elements to continuously divide the fluid into a single known volume part, and measure the total flow volume based on the number of times the metering chamber is filled and discharged with the fluid in this volume part successively and repeatedly.

Applications of oval gear flowmeter:

Oval gear flow meters can be made of different materials (cast iron, cast steel, 304 stainless steel, 316 stainless steel) and are suitable for flow measurement in industrial sectors such as chemical industry, petroleum, medicine, electric power, metallurgy and food.

Working principle of oval gear flowmeter:

The flow meter is composed of a metering box and a pair of elliptical gears installed in the metering box. It forms a sealed crescent-shaped cavity with the upper and lower cover plates (it is not absolutely sealed due to the rotation of the gears) as the calculation unit for primary displacement. When the liquid to be measured enters the flow meter through the pipeline, the pressure difference generated at the inlet and outlet drives a pair of gears to rotate continuously, continuously transporting the measured liquid through the crescent-shaped cavity to the outlet. The number of revolutions of the elliptical gear is related to each The product of four times the secondary displacement is the total amount of liquid flow measured. The flow meter is mainly composed of a housing, a counter, an elliptical gear and a coupling (magnetic coupling and axial coupling).

Features of oval gear flowmeter:

① Flow measurement has nothing to do with the flow state of the fluid. This is because the oval gear flowmeter relies on the pressure head of the measured medium to push the oval gear to rotate for measurement.

② The greater the viscosity of the medium, the smaller the leakage amount from the gap between the gear and the metering space. Therefore, the greater the stickiness of the nuclear measurement medium, the smaller the leakage error, and the more beneficial it is to the measurement.

③ The oval gear flowmeter has high measurement accuracy and is suitable for measuring the flow rate of high-viscosity media, but it is not suitable for fluids containing solid particles (solid particles will jam the gear, making it impossible to measure the flow rate). If gas is included in the liquid medium to be measured, measurement errors will also occur.

Application Guide for Oval Gear Flowmeter:

Flow measurement has nothing to do with the flow state of the fluid, because the oval gear flowmeter relies on the pressure head of the measured medium to push the oval gear to rotate for measurement.

The greater the viscosity of the medium, the smaller the leakage amount from the gap between the gear and the metering space. Therefore, the larger the stickiness of the measured medium, the smaller the leakage error, and the more beneficial it is to the measurement. The oval gear flowmeter has high measurement accuracy and is suitable for measuring the flow rate of high-viscosity media, but it is not suitable for fluids containing solid particles (solid particles will jam the gear, making it impossible to measure the flow rate).

If gas is included in the liquid medium to be measured, measurement errors will also occur. When installing an oval gear flowmeter, the pipeline should be cleaned before installation. If the liquid contains solid particles, a filter must be installed upstream of the pipeline; if the liquid contains gas, an exhaust device must be installed. HI-TOUCHM series oval gear flowmeter oval gear flowmeter does not have certain requirements for the front and rear straight pipe sections. It can be installed horizontally or vertically. When installing, the oval gear rotation axis of the flow meter should be parallel to the ground.

Advantages of oval gear flowmeter:

Oval gear flowmeter, also known as fixed displacement flowmeter, or PD flowmeter for short, is a type of flow meter with higher accuracy and is especially suitable for measuring the flow of high-viscosity media. The oval gear flowmeter uses a mechanical measuring element to continuously divide the fluid into a single known volume part, and measure the total volume of the fluid based on the number of times the metering chamber is filled and discharged with the fluid in this volume part one after another.

Installation instructions for oval gear flowmeter:

The pipeline of the oval gear flowmeter should be cleaned before installation. If the liquid contains solid particles, a filter must be installed upstream of the pipeline; if the liquid contains gas, an exhaust device must be installed. The oval gear flowmeter does not have certain requirements for the front and rear straight pipe sections. It can be installed horizontally or vertically. When installing, the oval gear rotation axis of the flow meter should be parallel to the ground.

Instructions for use of oval gear flowmeter:

An oval gear flowmeter that is correctly installed according to the requirements can ensure sufficient accuracy when used. Usually the accuracy of the cumulative value can reach 0.5 levels, making it a relatively accurate flow meter. However, if the flow rate of the measured medium is too small during use, the influence of the leakage error of the instrument will be prominent, and sufficient measurement accuracy can no longer be guaranteed. Therefore, oval gear flowmeters of different models and specifications have an allowable value for the minimum flow rate. Only when the actual measured flow rate is greater than the lower limit flow rate allowable value, the measurement accuracy can be guaranteed.
Secondly, when using an elliptical gear flowmeter, attention should be paid to the temperature of the measured medium not being too high, otherwise it will not only increase the measurement error, but also cause the gear to get stuck. For this reason, the oval gear flowmeter is used within the operating temperature range specified by the instrument.

After long-term use of the oval gear flowmeter, the internal gears will be corroded and worn, thus affecting the measurement accuracy. Therefore, you should always pay attention to it and disassemble it regularly for inspection. If conditions permit, it is best to calibrate it regularly.

Precautions for use:

① Clean the pipeline

New pipelines must be cleaned before operation, and often flushed with real flow afterwards to remove residual welding chips, scale, etc. At this time, the stop valves at the front and rear of the instrument should be closed first to allow the liquid flow to flow through the bypass pipe; if there is no bypass pipe, a short pipe should be installed at the position of the instrument instead.

② Exhaust the gas

Usually, after the solid liquid sweep, there is still a lot of air remaining in the pipeline. With the pressurized operation, the air flows through the volumetric flowmeter at a higher flow rate, and the movable measuring element may overspeed, damaging the shaft and bearings. Therefore, the flow rate should be increased slowly at the beginning to allow the air to gradually escape.

③ Bypass pipe switching sequence

When the liquid flow is transferred from the bypass pipe to the instrument, the opening and closing should be slow, especially in high-temperature and high-pressure pipelines. When starting, the first step is to slowly open valve A, and the liquid flows in the bypass pipe for a period of time; the second step is to slowly open valve B; The third step is to slowly open valve C; the fourth step is to slowly close valve A. When closing, follow the reverse sequence above. After starting, use the lowest pointer or word wheel and stopwatch to confirm that excessive flow has not been reached. The optimal flow rate should be controlled at (70~80)% of the maximum flow rate to ensure the service life of the instrument.

④ Monitoring filter

The filter network is most easily broken when starting a new line. After the trial operation, check whether the network is intact in time. At the same time, when the filter is clean and free of dirt, the two parameters of pressure loss at normal flow rates are recorded. In the future, there is no need to remove the filter to check the clogging condition of the filter. That is, the increase in pressure loss is used to determine whether cleaning is needed.

⑤ Measurement of high viscosity liquids

It is used for high viscosity liquids, which are generally heated to make them flow. When the meter is out of service, the liquid inside it cools and thickens. When it is re-activated, it must be heated until the viscosity of the liquid is reduced before the liquid flows through the meter. Otherwise, the movable measuring element will be bitten and the meter will be damaged.

⑥ Add lubricating oil

Lubricating oil must be added before gas use PDF is started, and the lubricating oil level gauge should be checked frequently during daily operation.

⑦ Steam used for flushing pipelines is prohibited from passing through the oval gear flowmeter.

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