Structure and principle of natural gas flow meter

Abstract: The structure and principle information of natural gas flow meter is provided by excellent flow meter and flow meter manufacturers. 1. Flowmeter structure: The flowmeter is composed of the following seven basic components: 1. The vortex generator is made of aluminum alloy and has a certain angle of helical blades. It is fixed at the front of the shrinking section of the shell to force the fluid to generate strong vortices. flow. 2. The shell itself. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the structure and principle of natural gas flowmeters. 1. Flowmeter structure: The flowmeter is composed of the following seven basic components: 1. The vortex generator is made of aluminum alloy and has a certain angle of helical blades. It is fixed at the front of the shrinking section of the shell to force the fluid to generate strong vortices. flow. 2. The shell itself has a flange and a certain shape of the fluid channel. According to different working pressures, the shell material can be cast aluminum alloy or stainless steel. 3. The intelligent flow totalizer is composed of an analog channel for temperature and pressure detection, a digital channel for flow detection, a microprocessor unit, a liquid crystal drive circuit and other auxiliary circuits, and is equipped with an external signal interface. 4. The temperature sensor uses Pt100 platinum resistance as the temperature sensitive element. Within a certain temperature range, its resistance value has a corresponding relationship with the temperature. 5. The pressure sensor uses a piezoresistive diffusion silicon bridge as a sensitive element, and its bridge arm resistance will change as expected under the action of external pressure. Therefore, under the action of a certain excitation current, the potential difference between its two output terminals is proportional to the external pressure. . 6. The piezoelectric crystal sensor is installed near the throat of the expansion section of the shell, which can detect the frequency signal of the vortex precession. 7. The derotator is fixed at the outlet section of the shell, and its function is to eliminate the vortex flow, so as to reduce the influence on the performance of the downstream instrument. 2. Working principle: Natural gas flowmeter For measuring gas, differential pressure flowmeter is the most widely used flowmeter, and its usage occupies the first place in all kinds of flowmeters. In recent years, due to the advent of various new flowmeters, its usage percentage has gradually declined, but it is still the most important type of flowmeter. Differential pressure flowmeter is an instrument that calculates flow according to the differential pressure generated by the standard orifice installed in the pipeline, the known fluid conditions and the geometric dimensions of the standard orifice and the pipeline. The differential pressure flowmeter consists of a primary device (standard orifice flowmeter) and a secondary device (differential pressure transmitter, distributor, controller and flow computer). 1. Torque analysis The torques acting on the turbine are: a. The rotational torque Tr generated on the blades when the fluid flows through the turbine, which is the active torque. b. The mechanical friction torque Trm generated by the friction between the turbine shaft and the bearing. c. The flow resistance torque Trf generated to the turbine when the fluid flows through the turbine. d. The electromagnetic resistance torque Tre generated by the electromagnetic converter to the turbine. Therefore, the rotational angular velocity of the turbine. It can be expressed as: In the formula, J is the moment of inertia of the turbine. In general, the electromagnetic resistance torque Tre is very small. The turbine rotates at a constant rotational angular velocity, so the differential of the rotational angular velocity w with respect to time is zero. That is: O=Tr-Trm-Trf As shown in the figure, the angle between the guide vane and the axis of the rotor isθ, the inlet and outlet flow rates of the fluid are u1 and u2. The angles between them and the circumferential direction areα1 andα2. The rotational force produced by the fluid acting on the rotor is circumferential. According to the momentum principle, the force fr in the circumferential direction is equal to the momentum change of the unit mass of fluid in the circumferential direction, namely: fr=gvρ(u1cosα1-u1cosα2) In the formula, qv andρare the volume flow and density of the fluid. Because the circular motion speed of the inlet and outlet is equal, there are: ur1=ur2=ur=wr. The angle between the relative velocity of the fluid leaving the blade and the direction of circular motion is equal to the inclination of the bladeθ, therefore, there are:β2=90°-θ. Because the axial component of the fluid velocity does not change, there are: u1=u2sinα2 After simplification, we get: fr=qvρ(u1tanθ-wr). Therefore, the main thrust moment is: Tr=frr=rqvρ(u1tanθ-wr) Consider u1-qv/A. A is the flow cross-sectional area.

mass flow meter are all following the most compatible manufacturing regulations.

Beijing Sincerity Automatic Equipment Co., Ltd has been a leading server of for many years. Visit the website Sincerity Flow Meter for quality mass flow meter.

In business, mass flow meter means cultivating brand loyalty; once someone is working with a product or using a service, they are more likely to commit to paying for Sincerity again.

mass flow meter is sold in oversees market and has high reputation. Besides, our products are sold with reasonable prices.