What are the types of flow meters?

Abstract: What kinds of information can flow meter be divided into? The excellent flow meter and flow meter production and quotation manufacturers provide you with information. According to the actual situation of the current flowmeter products, according to the structure principle of the flowmeter, it can be roughly classified into the following types: 1. Positive displacement flowmeter The positive displacement flowmeter is equivalent to a container of standard volume, which continuously adjusts the flow of the flowmeter. media progress. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the articles that flowmeters can be divided into. According to the actual situation of the current flowmeter products, according to the structure principle of the flowmeter, it can be roughly classified into the following types: 1. Positive displacement flowmeter The positive displacement flowmeter is equivalent to a container of standard volume, which continuously adjusts the flow of the flowmeter. medium to measure. The larger the flow, the more times the measurement is performed, and the higher the frequency of the output. The principle of positive displacement flowmeter is relatively simple, and it is suitable for measuring fluids with high viscosity and low Reynolds number. According to the shape of the rotating body, the products currently produced are divided into: oval gear flowmeters, waist wheel flowmeters (Roots flowmeters), rotary piston and scraper flowmeters suitable for measuring liquid flow; servo-type flowmeters suitable for measuring gas flow Volumetric flowmeter, membrane type and rotary flowmeter, etc. 2. Impeller flowmeter The working principle of the impeller flowmeter is that the impeller is placed in the fluid to be measured, and it is rotated by the impact of the fluid flow, and the flow rate is reflected by the speed of the impeller rotation. Typical impeller flowmeters are water meters and turbine flowmeters, and their structures can be mechanical transmission output type or electrical pulse output type. Generally, the accuracy of the water meter output by mechanical transmission is low, and the error is about 2%, but the structure is simple and the cost is low. It has been mass-produced in China, and is standardized, generalized and serialized. The accuracy of the turbine flowmeter output by the electrical pulse signal is high, and the general error is ? 0.2% to 0.5%. 3. Differential pressure flowmeter (variable pressure drop flowmeter) Differential pressure flowmeter consists of a primary device and a secondary device. The primary device is called a flow measuring element, which is installed in the pipeline of the measured fluid to generate a pressure difference proportional to the flow rate (velocity) for the secondary device to display the flow. The secondary device is called display instrument. It receives the differential pressure signal generated by the measuring element and converts it into the corresponding flow for display. The primary device of the differential pressure flowmeter is often a throttling device or a dynamic pressure measuring device (pitot tube, uniform velocity tube, etc.). The secondary device is a variety of mechanical, electronic and combined differential pressure gauges with flow display instruments. Differential pressure sensitive elements of differential pressure gauges are mostly elastic elements. Since the differential pressure and flow are in a square root relationship, the flow display instruments are equipped with a square root device to linearize the flow scale. Most instruments are also equipped with a flow accumulating device to display the accumulated flow for economical accounting. This method of measuring flow using differential pressure has a long history and is relatively mature. It is generally used in more important occasions around the world, accounting for about 70% of various flow measurement methods. This kind of meter is used in the flow measurement of main steam, feed water, condensate, etc. in power plants. 4. The float of the variable area flowmeter (equal pressure drop flowmeter) placed in the upper and lower conical flow channels is moved by the force of the fluid flowing from the bottom to the top. When this force and the float's“show weight”(the weight of the float itself minus the buoyancy of the fluid it is subjected to) is in equilibrium, and the captive is at rest. The height at which the float rests can be used as a measure of the flow rate. Since the flow cross-sectional area of ​​the flowmeter varies with the height of the float, and the pressure difference between the upper and lower parts is equal when the float is stable, this type of flowmeter is called a variable area flowmeter or an equal pressure drop flowmeter. The typical instrument of this type of flowmeter is a rotor (float) flowmeter. 5. Momentum flowmeter A flowmeter that uses the momentum of the measured fluid to reflect the flow rate is called a momentum flowmeter. Since the momentum P of the flowing fluid is proportional to the density of the fluid and the square of the flow velocity v, that is, pv2, when the flow section is determined, v is proportional to the volume flow Q, so pQ2. Set the proportional coefficient as A, then Q=A. Therefore, when P is measured, the flow rate Q can be reflected. This type of flowmeter mostly uses the detection element to convert the momentum into pressure, displacement or force, etc., and then measure the flow. Typical instruments for such flowmeters are target and rotary vane flowmeters. 6. Impulse flowmeter The flowmeter that uses the impulse theorem to measure the flow is called the impulse flowmeter. It is mostly used to measure the flow of granular solid media, and it is also used to measure the flow of mud, crystalline liquid and abrasives. Flow measurement ranges from a few kilograms per hour to nearly 10,000 tons. A typical instrument is a horizontal component impulse flowmeter. The measurement principle is that when the measured medium falls freely from a certain height h to the detection plate with an inclined angle, an impulse is generated, and the horizontal component of the impulse is proportional to the mass flow rate, so Measuring this horizontal component can reflect the size of the mass flow. According to the detection method of signal (9), this type of flowmeter is divided into displacement detection type and direct force measurement type. 7. Electromagnetic flowmeter Electromagnetic flowmeter is made by applying the electric conductor to move in the magnetic field to generate induced electromotive force, and the induced electromotive force is proportional to the flow rate, and it is made by measuring the electromotive force to reflect the principle of pipeline flow. Its measurement accuracy and sensitivity are high. In industry, it is mostly used to measure the flow of water, pulp and other media. The maximum pipe diameter that can be measured is 2m, and the pressure loss is extremely small.
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