Vortex flow meter is a kind of velocity flowmeter, also known as vortex flowmeter or Karman vortex flowmeter, which is a high-tech mechanical and electrical product integrating signal detection and microelectronics intelligent technology. It is mainly based on the Karman vortex street theory, and also uses piezoelectric crystals to detect the vortex frequency generated when the fluid passes through the triangular column in the pipeline, so that the flow rate of the fluid can be measured.
The sensor of the intelligent vortex flowmeter uses the induction element is not directly in contact with the measured medium, its performance is stable, high reliability, and there are no moving parts in the sensor, its structure is simple and firm, the vortex flowmeter is mainly used for the flow measurement of industrial pipeline medium fluid, such as gas, liquid, vapor, oil and other media. It is characterized by small pressure loss, large range, high accuracy, and is almost not affected by fluid density, pressure, temperature, viscosity and other parameters when measuring volume flow under working conditions. There are no moving mechanical parts, so the reliability is high and the instrument parameters can be stable for a long time. Vortex flowmeter adopts piezoelectric stress sensor, high reliability, analog standard signal, but also digital pulse signal output, easy to use with computer and other digital systems, is a relatively advanced, ideal flow meter.

Principle of vortex flow meter
When a triangular column type vortex generator is set in the fluid, regular vortices are alternately generated from both sides of the vortex generator. This vortex is called Karman vortex, and the vortices are arranged asymmetrically in the downstream of the vortex generator. The pulse frequency signal output by the vortex flowmeter VSF is not subject to the physical properties of the fluid
In other words, the instrument coefficient is only related to the shape and size of the vortex generator and the pipeline within a certain range of Reynolds number. However, as a flow meter in the material balance and energy measurement need to detect the mass flow, then the output signal of the flow meter should also monitor the volume flow and fluid density, fluid physical properties and components have a direct impact on the flow measurement.
In practical applications, often the maximum flow is far lower than the upper limit of the instrument, with the change of load, the minimum flow is often lower than the lower limit of the instrument, the instrument is not working in its best working section, in order to solve this problem, usually use in the measurement at the measurement to improve the flow rate, and choose a smaller diameter of the instrument to facilitate the measurement of the instrument. However, this reducing method must be rectified in a straight pipe section with a length of more than 15D between the reducing pipe and the instrument, which makes processing and installation inconvenient. Our company developed a profile shape of circular diameter rectifier, with multiple functions of rectification, increasing flow rate and changing flow rate distribution, its structure size is small, only 1/3 of the inner diameter of the process pipe, and the vortex flowmeter as one, not only do not need to add another straight pipe section, but also reduce the requirements of the process pipe straight pipe section, installation is very convenient. The temperature compensated vortex flowmeter also has a temperature sensor, which can directly measure the temperature of saturated steam and calculate the pressure, so as to display the mass flow rate of saturated steam. Temperature and pressure compensation body with temperature and pressure sensor for gas flow measurement can directly measure the temperature and pressure of the gas medium, so as to display the standard volume flow of the gas.
Measuring medium: gas, liquid, vapor
Caliber specifications: Flange clamping caliber selection of 25,32,50,80,100
Flange connection caliber selection: 100,150,200
Vortex flowmeter features:
The table body and the triangular column are cast once, which reduces the deformation caused by the measurement hole due to the welding of the triangular column, improves the stability of the vortex signal, adopts the built-in structure, that is, the measurement probe is inserted into the triangular column, the anti-interference ability of the product is strong, the use of disturbance suppression circuit and anti-vibration sensing head, so that the instrument has a certain anti-environmental vibration performance, and the pressure loss is small, about 1/4 of the hole plate flowmeter
Energy efficient flow meter, flexible installation, can be installed horizontally, vertically and at different angles
Vortex flowmeter installation requirements:
1, vortex flowmeter can be installed indoors or outdoors. If installed in the ground well, and there is a possibility of flooding, should choose a submersible sensor or transmitter.
2, the vortex flowmeter can be installed horizontally, vertically or tilted on the pipeline, but when measuring liquid, the pipeline must be filled with liquid. Therefore, when installing a vortex flowmeter on a vertical or inclined pipeline, the flow direction of the liquid should be from the bottom up.
3, the upstream side and downstream side of the vortex flowmeter should have a long straight pipe section, and the required length of the upstream and downstream straight pipe section varies with the pipeline condition. The upstream of the vortex flowmeter should try to avoid installing a regulating valve or a half-open valve, and the regulating valve or a half-open valve should be installed in the downstream of the flowmeter after 5D.
4. The inner diameter of the pipeline installed with the vortex flowmeter must be consistent with the inner diameter of the flowmeter, otherwise it must be reduced.
5, in the design of the pipeline, the upper end of the sensor or transmitter should be left at least 500mm space, to facilitate debugging and maintenance, the selection of vortex flowmeter should be based on different media and caliber selection of suitable vortex flowmeter products, such as the measurement of saturated steam and superheated steam please choose steam vortex flowmeter, measurement of gas, liquid please choose vortex flowmeter, For diameter greater than DN200mm can choose to insert vortex flowmeter.

The instruments produced by Xi ‘an Yunyi Instrument Co., Ltd. include: thermal resistance, thermocouple, bimetal thermometer, temperature transmitter, pressure gauge, pressure transmitter, level meter, liquid level transmitter, flow meter, intelligent digital display instrument, instrument pipe valve parts, etc. Wire and cable include: power cable, high temperature resistant cable, silicone rubber cable, all kinds of motor wiring, frequency conversion cable, mineral insulated cable, computer cable, instrument cable, cross-linked cable, fire-resistant cable, flat cable, silver-plated wire, tracing cable, tracing cable, tracing sample tube, locomotive cable, fireproof cable, Marine cable, compensation wire, compensation cable, aluminum alloy cable, etc. Nitrile cable, cold resistant cable, rubber sheath cable, welding wire, mining cable, photovoltaic cable, wind power cable and other products.
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